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EP2347690B1 - Suction cleaning device - Google Patents

Suction cleaning device Download PDF

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Publication number
EP2347690B1
EP2347690B1 EP11161193.5A EP11161193A EP2347690B1 EP 2347690 B1 EP2347690 B1 EP 2347690B1 EP 11161193 A EP11161193 A EP 11161193A EP 2347690 B1 EP2347690 B1 EP 2347690B1
Authority
EP
European Patent Office
Prior art keywords
cleaning device
valve
vacuum cleaning
sealing
filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP11161193.5A
Other languages
German (de)
French (fr)
Other versions
EP2347690A2 (en
EP2347690A3 (en
Inventor
Christian Stewen
Uli HÄUSSERMANN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alfred Kaercher SE and Co KG
Original Assignee
Alfred Kaercher SE and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Alfred Kaercher SE and Co KG filed Critical Alfred Kaercher SE and Co KG
Priority to PL11161193T priority Critical patent/PL2347690T3/en
Publication of EP2347690A2 publication Critical patent/EP2347690A2/en
Publication of EP2347690A3 publication Critical patent/EP2347690A3/en
Application granted granted Critical
Publication of EP2347690B1 publication Critical patent/EP2347690B1/en
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/0072—Mechanical means for controlling the suction or for effecting pulsating action
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/20—Means for cleaning filters

Definitions

  • the invention relates to a vacuum cleaning device having a dirt collecting container, which has a suction inlet and is in flow connection via at least one filter and at least one suction line with at least one suction unit, and with at least one downstream of the at least one filter in the at least one suction line opening outside air inlet, by means of at least a closure valve is closable, wherein the at least one closing valve has a movable valve body which rests in a closed position to form at least one valve seat forming one or more sealing lines, the at least one sealing line defining a surface which in the closed position of the closing valve with a differential pressure is charged.
  • Saugtivsetti can be configured, for example, as a vacuum cleaner or as sweeping vacuum. They have a dirt collecting container, which can be acted upon by one or more suction units with negative pressure, so that forms a suction flow, under the influence of dirt in the dirt collecting container can be sucked.
  • the dirt collector is connected via at least one filter and at least one adjoining suction line with the suction unit in flow communication.
  • the at least one filter makes it possible to separate solids, so for example dirt or dust particles, from the suction flow. During the operation of the vacuum cleaning device, more and more solids accumulate on the filter, so that the filter is an increasing flow resistance and must therefore be cleaned.
  • the at least one filter against the flow direction formed in the suction flow direction can be acted upon by external air, the downstream of the filter can flow into the suction line via the outside air inlet.
  • ambient air can be used as external air or compressed air also stored by the vacuum cleaning device or stored in a reservoir under pressure.
  • the at least one closing valve has a movable valve body which bears tightly against at least one associated valve seat during the suction operation, wherein at least one sealing line is formed between the valve seat and the valve body, along which the outside air inlet is sealed.
  • the at least one sealing line delimits a surface which is subjected to a differential pressure in the closed position of the at least one closing valve.
  • Saugkossmaschine are for example from the DE 298 23 411 U1 in which it is proposed to close the suction inlet for filter cleaning, so that forms a strong negative pressure within the dirt collecting container. Subsequently, a closing valve is then opened, thereby cleaning a filter. It can be achieved by an effective cleaning, but this must be completely interrupted the suction operation. To counteract this disadvantage, is in the DE 199 49 095 A1 proposed to clean only a portion of the filter, so that over another portion of the suction operation can be maintained. Individual sections of the filter are thus cleaned in succession, without the suction must be interrupted. However, the supply of external air in each case only to a portion of the filter requires a structurally complex mechanism for the closing valve.
  • Object of the present invention is to provide a Saugquessêt of the type mentioned in such a way that the at least one closing valve structurally simple design and the at least one filter can be completely cleaned within a short time.
  • the idea flows in that by providing one or more seal lines as long as possible, but which limit the smallest possible area, a strong, abrupt onset of external air flow can be provided during lifting of the valve body from the valve seat within a very short time, so that on the side facing away from the dirt collecting container of the at least one filter, the negative pressure drops abruptly and the filter is flowed through in the counter-current direction with external air.
  • the sudden pressure increase has the consequence that the filter is mechanically shaken and cleaned, whereby the cleaning can be done within a very short time.
  • the total length of all sealing lines is chosen to be significantly larger than the circumference of a circular area whose surface area corresponds to the area of the surface bounded by the sealing lines.
  • the ratio between the square of the total length of all sealing lines and the size of the total of the sealing lines limited area is according to the invention at least 25 and is thus at least twice as large as in the case that there is only one seal line surrounding a closed circular area whose circumference of the Sealing line is defined.
  • the ratio of the square of the length of the sealing line and the size of the circular area gives a value of approximately 12.5, namely four times the number ⁇ (3.14).
  • the area delimited by the at least one sealing line denotes that area which, in the closed position of the closing valve, is acted on by the pressure difference which forms via the closing valve.
  • This surface is delimited by the at least one sealing line, and according to the invention it is provided that, when providing the longest possible sealing line, the area subjected to the differential pressure is chosen as small as possible. Since the surface acted upon by the differential pressure determines the force with which the closing valve is acted upon in its closed position, the mechanical load of the closing valve can be reduced by providing the smallest possible area. This in turn has the consequence that the closing valve may have a small size, and yet on the at least one, as long as possible selected sealing line when opening the closing valve, a strong external air flow can be provided for cleaning the filter.
  • the square of the total length of all sealing lines amounts to at least 50 times, preferably more than 100 times, the total size of all the surfaces delimited by the sealing lines.
  • the at least one closing valve may have a single sealing line, for example a star-shaped or in the form of the edge of a clover designed seal line with alternating positive and negative curvature.
  • the at least one closing valve has a plurality of sealing lines in the form of closed sealing sections.
  • two sealing sections can be used which define an outer edge and an inner edge of a surface acted upon by the differential pressure.
  • the closed sealing sections can be arranged side by side. Preferably, however, the sealing sections form nested sealing rings. Preferably, the sealing rings are arranged concentrically with each other. For example, four sealing rings can be used, which are arranged concentrically to each other, wherein each two sealing rings define an annular, acted upon by the differential pressure surface. In this case, the total of the sealing lines limited area results from the sum of the two annular surfaces.
  • the sealing rings can be arranged over their entire circumference at a uniform distance from each other, but it can also be provided that touch individual sealing rings.
  • the sealing sections are designed to be round and form, for example, an oval or a circle.
  • sealing line is preferably arranged in one plane.
  • the individual sealing lines are arranged in different planes, for example, in staggered or tilted planes.
  • the valve body on a valve disc which is tightly applied to the at least one valve seat with the interposition of at least one sealing line defining a sealing element.
  • the valve disk can be formed very flat, so that the closing valve requires only a very small space.
  • valve disk has at least one, preferably annular passage opening, which is delimited by one or more sealing elements in the closed position of the valve disk.
  • Such a configuration has the advantage that, when lifting the valve disk from the valve seat, external air can flow into the suction line laterally next to the valve disk, but also through the at least one passage opening of the valve disk. Even if the valve plate lifts only slightly from the valve seat, already a strong external air flow can be achieved. This not only has the advantage that only a small range of motion for the valve disc must be ensured, but this has the advantage that even a very short opening movement is sufficient to abruptly act on the at least one filter with external air and thus an effective To achieve cleaning.
  • the at least one valve seat has a plurality of passage openings, which are each delimited by at least one sealing element in the closed position of the valve disk. It can be provided, for example, that the at least one valve seat has two concentrically arranged annular through openings comprises, on the lifting of the valve disk from the valve seat external air can flow into the suction line.
  • the valve body may be pivotably mounted on the at least one valve seat or on a device-fixed part. It is particularly advantageous, however, if the valve body is held displaceably, in particular it can be provided that the valve body is held displaceably in a guide.
  • the guide is cylindrical in an advantageous embodiment, because this gives the possibility to rotate the valve body about the cylinder axis of the guide, without thereby affecting the opening and closing movement of the valve body.
  • the at least one closing valve has a guide sleeve into which a guide receptacle dips.
  • the guide sleeve can be arranged on the valve body, preferably the guide sleeve is integrally connected to the valve body.
  • valve body is acted upon by a spring with a closing force.
  • the spring moves the opening when the closing valve from the valve seat lifting valve body back into its closed position as soon as the negative pressure in the suction line downstream of the at least one filter is degraded by the action of the suction unit.
  • the suction unit is in fact during the filter cleaning with the at least one filter in flow communication, so that the inflowing via the closing valve in the suction line foreign air, which briefly acts on the filter in the counterflow direction is sucked from the suction unit.
  • In the closed position ensures the spring for a reliable fixation of the valve body.
  • the spring absorbs the energy of the valve body, brakes it and accelerates it back to its closed position.
  • the spring may be designed in several parts, in particular in two parts, wherein a longer spring part may have a lower spring constant than a shorter spring part.
  • the shorter spring part with the higher spring constant limits the opening travel of the valve body and thus also the ingress of foreign air.
  • a single spring is used, which preferably has a non-linear characteristic, so that the movement of the valve body at the beginning is only slightly and then more inhibited.
  • a very strong pressure surge can be achieved by which the at least one filter can be cleaned in a very short time.
  • the valve body is held by a magnetic holder in the closed position.
  • a magnetic holder for example, at least one permanent magnet can be used, which reliably holds the valve body in its closed position in the case of pressure differences as they occur during the proper suction operation at the at least one closing valve. If the pressure difference is increased for filter cleaning, the magnetic holder releases the valve body, which then lifts off from the valve seat, so that external air can flow in.
  • the pressure difference can be increased, for example, by the fact that the negative pressure within the dirt collecting container is increased, for example by closing the suction inlet or a suction hose connected to this. Alternatively or additionally, the pressure difference can be increased by the fact that external air with overpressure the at least one closing valve is supplied.
  • the vacuum cleaning device may have a pressure accumulator which is filled with a compressor. If external air is released from the pressure accumulator, then the overpressure exerted on the valve body exerts an increased force in the opening direction, which force can no longer be compensated by the magnet holder, so that the at least one closing valve opens. If the supply of pressurized external air is interrupted, then the pressure builds up, and under the action of the magnetic force, possibly supported by the action of a closing spring, the valve body goes back to its closed position.
  • the magnet holder comprises an electromagnet. This allows an electrical control of the magnetic holder such that the closing valve maintains its closed position, as long as the solenoid is energized. If the power supply is interrupted, the closing valve opens abruptly.
  • the electromagnet as an electro-adhesive magnet.
  • Such Elektrohaftmagente are characterized by a very low magnetic remanence, so that when interrupting the power supply virtually no residual magnetic field is present and therefore the valve body can lift off the valve seat in a very short time.
  • the at least one closing valve is mechanically actuated. It is advantageous, however, if it is electronically operable.
  • the pressure difference that forms via the filter is detected by means of pressure sensors. The greater the pressure difference, the greater the flow resistance of the filter, and when a predetermined value for the pressure difference is exceeded, the at least one closing valve can be actuated by means of control electronics.
  • a time-controlled actuation of the at least one closing valve is advantageous. It can be provided that it can be actuated with different time intervals. In particular, after a plurality of shorter time intervals, a further actuation may be provided only after a longer time interval. However, effective filter cleaning can also be achieved with filter cleaning at constant time intervals.
  • the at least one filter is preferably designed as a folded filter, for example in the form of a filter cartridge or a flat pleated filter.
  • the vacuum cleaning device may have a plurality of filters, but it has proved to be particularly advantageous if the vacuum cleaning device comprises a single filter.
  • the filter can be acted upon by external air simultaneously by opening all closing valves over its entire surface.
  • the inventive design of the vacuum cleaning device makes it possible to abruptly increase the negative pressure in the suction line in the region adjacent to the at least one filter, and then the negative pressure is reduced again within a very short time due to the action of the at least one suction unit.
  • the valve body can momentarily remain in an open position in order then to change over again into its closed position.
  • the valve body is continuously movable back into its closed position via its open position. In such an embodiment, the valve body performs a continuous movement when opening the closing valve without it remains in its open position.
  • valve body is greatly accelerated when opening the closing valve and then braked again so that it reverses its direction of movement and then its closed position occupies.
  • the entire movement of the valve body starting from its closed position on the open position back into the closed position can be done in fractions of a second.
  • the at least one filter is acted upon by the closing valve for less than 200 ms, in particular for less than 100 ms, with external air.
  • Such loading does not result in any appreciable interruption of the suction operation for the user, but due to the provision of a very long seal line for the at least one closing valve, it results in effective cleaning of the filter.
  • the at least one filter can be acted on by means of the at least one closing valve while maintaining a negative pressure in the mouth region of a suction hose opening into the suction inlet with external air. If the at least one closing valve is opened, the pressure on the side of the filter facing away from the dirt collecting container abruptly increases and is then reduced again. The sudden increase in pressure causes an effective cleaning of the filter, but since it is degraded by the at least one suction turbine immediately again, it does not lead to a complete interruption of the negative pressure in the mouth region of the opening into the suction inlet suction hose. Rather, a quasi-continuous suction operation can be maintained.
  • the negative pressure in the suction hose at a distance of 3 cm from the suction inlet at most for 150 ms below 40% of the value formed when the closing valves are closed is usually a standard hose with an inside diameter of 35 mm and a length of 2.5 m is connected.
  • a negative pressure is formed in the suction hose and in the dirt collecting container, the negative pressure in the suction hose at a distance of 3 cm from the suction inlet, for example, about 50 mbar, if no tool is connected to the free end of the suction hose, the free end of the suction hose so it is open.
  • the at least one closing valve for filter cleaning is opened for a short time, the negative pressure at the designated point briefly drops to a value of less than 20 mbar, but at the latest after 150 ms the negative pressure again exceeds the value of 20 mbar and then approaches the original one again Value of 50 mbar. For the user, therefore, there is no noticeable interruption of the suction operation. It may be provided, for example, that the negative pressure at the designated point for less than 100 ms, in particular for about 50 to about 80 ms drops below a value of 40% of the value formed at closed closing valves value.
  • a vacuum cleaning device in the form of a vacuum cleaner 10 is shown schematically with a lower part, which forms a dirt collecting container 12, on which an upper part 14 is placed, which receives a suction unit 16.
  • the dirt collecting container 12 has a volume of up to 80 l, preferably a volume of about 30 l to about 80 l. It comprises a suction inlet 18, to which a suction hose 20 can be connected, at the free end, which is not shown in the drawing to achieve a better overview, a suction nozzle can be connected.
  • the suction hose 20 is connected to a machining tool, for example a drilling unit or a milling unit, so that dust accumulating during operation of the machining tool can be sucked off.
  • the upper part 14 forms a suction outlet 22 for the dirt collecting container 12, wherein at the suction outlet 22, a pleated filter 24 is held, to which a suction line in the form of a suction channel 26 connects, via which the pleated filter 24 is in flow connection with the suction unit 16.
  • the dirt collecting 12 can be acted upon by the suction unit 16 with negative pressure, so that a in FIG. 1 symbolized by the arrows 28 Saugströmung forms, below their effect dirt can be sucked into the dirt collector 12.
  • the fold filter 24 the dirt particles from the suction flow 28 can be deposited.
  • a closing valve 30 is arranged in the upper part 14, which in FIG. 2 is shown enlarged. It comprises a stationary in the upper part 14 arranged valve holder 32 which forms a valve seat and cooperates with a valve body in the form of a valve plate 34.
  • the valve disk 34 is acted upon by a closing spring 36 with a non-linear characteristic in the direction of the valve holder 32 with a closing force.
  • the closing spring 36 is clamped between a plate-like, in the upper part 14 arranged filter holder 38 and the valve plate 34.
  • the valve holder 32 has two concentric with each other, annular through holes 40, 42, which are sealed in the closed position of the closing valve 30 of the valve plate 34.
  • the through holes 40 and 42 are formed in a retaining plate 44 of the valve holder 23, wherein the retaining plate 44 is divided by the through holes 40 and 42 in an outer ring 45 and an inner ring 46 concentrically surrounding a cylindrical central portion 47 and by means of the outside of the central part 47 in radial direction protruding holding ribs 49 are fixed to the middle part 47.
  • the central part 47 comprises a hollow cylindrical shell 51, which is covered on the upper side by an end wall 52 and receives an electro-magnet 54. This is surrounded by an annular space 55 within the middle part 47 and is connected via a connection cable, not shown in the drawing, to a control unit of the vacuum cleaner 10, likewise not shown in the drawing, in electrical connection.
  • the valve disk 34 has an annular passage opening 57, which is penetrated by a plurality of radially aligned support ribs 58, which connect an outer annular region 60 of the valve disk 34 with a circular central region 61 of the valve disk 34. From the central region 61 is in the direction of the central portion 47 of the valve holder 32 from a guide sleeve 63 from above, which dips into the annular space 55 of the valve holder 32 and an iron plate 64 receives, which is glued into the guide sleeve 63.
  • the valve disk 34 carries on its valve holder 32 facing upper side an inner sealing ring 66, a middle sealing ring 67 and an outer sealing ring 68, which are concentrically aligned with each other and each form a sealing lip.
  • the inner sealing ring 66 extends along an inner edge 70 of the passage opening 57
  • the middle sealing ring 67 runs along an outer edge of the passage opening 57
  • the outer sealing ring 68 extends along the outer periphery 72 of the valve disk 34.
  • the inner sealing ring 66 sealingly engages the outer edge 74 of the through hole 40 of the valve holder 32, and the middle seal 67 and the outer seal 68 sealingly lie against an inner edge 75 and an outer edge 76 of the passage opening 42nd at.
  • the sealing rings 66, 67 and 68 thus define annular sealing lines which delimit a surface acted upon by the pressure difference forming at the closing valve 30.
  • the inner sealing ring 66 in this case limits a first, circular partial surface having a radius R1, and the sealing rings 67 and 68 delimit a second, annular partial surface with an inner radius R2 and an outer radius R3.
  • the closing valve 30 has a defined by the sealing rings 66, 67 and 68 sealing line, the length of which results from the sum of the length of the sealing rings 66, 67 and 68.
  • the sealing line formed in this way delimits a surface which is acted upon by the pressure difference forming at the closing valve 30 from the sum of the explained first and second partial surfaces.
  • the square of the total length of the sealing line is considerably larger than 25 times the area bounded by the sealing line. Compared with a circular area whose circumference corresponds to the total length of the sealing line, the area actually bounded by the sealing line is significantly smaller than 50% of the circular area.
  • FIG. 7 shows the course of corresponding pressure measurements. If the current supply of the electro-adhesion magnet 54 is interrupted to actuate the closing valve 30, the magnetic force with which the iron plate 64 is held on the electro-adhesive magnet abruptly ceases.
  • valve disc 34 lifts against the closing force of the closing spring 36 of the valve holder 32 under the action of the pressure prevailing on the closing valve 30.
  • the closing spring 36 absorbs the energy of the valve disk 34, brakes it and then accelerates it back again, so that it assumes its closed position again within a short time and the passage openings 40 and 42 of the valve holder 32 closes again.
  • the external air flow 80 is formed, so that external air flows in the counterflow direction through the pleated filter 24 into the dirt collecting 12 and drops in the mouth region of the suction hose 20, the negative pressure within about 40 to about 60 ms.
  • the valve disc 34 Since then, however, the valve disc 34 has already taken its closed position again and the inflowing external air is sucked from the suction unit 16, the negative pressure then increases again to take after about 200 ms practically its original value of about 50 mbar. Values below 40% of the value formed when the closing valve 30 is closed, that is to say values of less than 20 mbar, the negative pressure in the mouth region of the suction hose 20 only lasts for a period of approximately 60 ms. This has the consequence that a quasi-continuous suction operation is maintained for the user and yet a reliable filter cleaning is ensured.
  • the closing valve in this case has a compact design with a low design and can be produced inexpensively.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Valves (AREA)
  • Cleaning In General (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Power Steering Mechanism (AREA)
  • Detergent Compositions (AREA)
  • Surgical Instruments (AREA)
  • Inorganic Insulating Materials (AREA)
  • Refuse Collection And Transfer (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

A suction cleaning appliance comprises a dust container (12) with inlet (18), filter (24) and a lead (20) connected to a suction unit (16). There is an air inlet through a closable valve with sealing lines that bound a surface that is impacted by a pressure difference in the closed position. The square of the total length of the sealing lines is at least 25 times the total size of all the bounding surfaces under a pressure differential.

Description

Die Erfindung betrifft ein Saugreinigungsgerät mit einem Schmutzsammelbehälter, der einen Saugeinlass aufweist und über mindestens ein Filter und zumindest eine Saugleitung mit mindestens einem Saugaggregat in Strömungsverbindung steht, und mit zumindest einem stromabwärts des mindestens einen Filters in die mindestens eine Saugleitung einmündenden Fremdlufteinlass, der mittels zumindest einem Schließventil verschließbar ist, wobei das mindestens eine Schließventil einen bewegbaren Ventilkörper aufweist, der in einer Schließstellung unter Ausbildung von einer oder mehreren Dichtungslinien an mindestens einem Ventilsitz anliegt, wobei die mindestens eine Dichtungslinie eine Fläche begrenzt, die in der Schließstellung des Schließventils mit einem Differenzdruck beaufschlagt ist.The invention relates to a vacuum cleaning device having a dirt collecting container, which has a suction inlet and is in flow connection via at least one filter and at least one suction line with at least one suction unit, and with at least one downstream of the at least one filter in the at least one suction line opening outside air inlet, by means of at least a closure valve is closable, wherein the at least one closing valve has a movable valve body which rests in a closed position to form at least one valve seat forming one or more sealing lines, the at least one sealing line defining a surface which in the closed position of the closing valve with a differential pressure is charged.

Derartige Saugreinigungsgeräte können beispielsweise als Staubsauger oder auch als Kehrsauggerät ausgestaltet sein. Sie weisen einen Schmutzsammelbehälter auf, der von einem oder mehreren Saugaggregaten mit Unterdruck beaufschlagt werden kann, so dass sich eine Saugströmung ausbildet, unter deren Einfluss Schmutz in den Schmutzsammelbehälter eingesaugt werden kann. Der Schmutzsammelbehälter steht über mindestens ein Filter und zumindest eine sich daran anschließende Saugleitung mit dem Saugaggregat in Strömungsverbindung. Das mindestens eine Filter ermöglicht es, Feststoffe, also beispielsweise Schmutz- oder Staubteilchen, aus der Saugströmung abzuscheiden. Im Laufe des Betriebes des Saugreinigungsgerätes sammeln sich immer mehr Feststoffe am Filter an, so dass das Filter einen zunehmenden Strömungswiderstand darstellt und deshalb abgereinigt werden muss. Hierzu kann das mindestens eine Filter entgegen der sich im Saugbetrieb ausbildenden Strömungsrichtung mit Fremdluft beaufschlagt werden, die stromabwärts des Filters über den Fremdlufteinlass in die Saugleitung einströmen kann. Als Fremdluft kann beispielsweise Umgebungsluft zum Einsatz kommen oder auch vom Saugreinigungsgerät unter Druck gesetzte oder in einem Vorratsbehälter unter Druck bevorratete Druckluft. Während des Saugbetriebes ist der Fremdlufteinlass von dem mindestens einen Schließventil dicht verschlossen, das zur Filterabreinigung geöffnet wird. Das mindestens eine Schließventil weist einen bewegbaren Ventilkörper auf, der sich während des Saugbetriebes dicht an zumindest einen zugeordneten Ventilsitz anlegt, wobei sich zwischen dem Ventilsitz und dem Ventilkörper zumindest eine Dichtungslinie ausbildet, entlang derer der Fremdlufteinlass dicht verschlossen wird. Die mindestens eine Dichtungslinie begrenzt eine Fläche, die in der Schließstellung des mindestens einen Schließventils mit einem Differenzdruck beaufschlagt wird.Such Saugreinigungsgeräte can be configured, for example, as a vacuum cleaner or as sweeping vacuum. They have a dirt collecting container, which can be acted upon by one or more suction units with negative pressure, so that forms a suction flow, under the influence of dirt in the dirt collecting container can be sucked. The dirt collector is connected via at least one filter and at least one adjoining suction line with the suction unit in flow communication. The at least one filter makes it possible to separate solids, so for example dirt or dust particles, from the suction flow. During the operation of the vacuum cleaning device, more and more solids accumulate on the filter, so that the filter is an increasing flow resistance and must therefore be cleaned. For this purpose, the at least one filter against the flow direction formed in the suction flow direction can be acted upon by external air, the downstream of the filter can flow into the suction line via the outside air inlet. For example, ambient air can be used as external air or compressed air also stored by the vacuum cleaning device or stored in a reservoir under pressure. During the suction operation, the outside air inlet is tightly closed by the at least one closing valve, which is opened for filter cleaning. The at least one closing valve has a movable valve body which bears tightly against at least one associated valve seat during the suction operation, wherein at least one sealing line is formed between the valve seat and the valve body, along which the outside air inlet is sealed. The at least one sealing line delimits a surface which is subjected to a differential pressure in the closed position of the at least one closing valve.

Derartige Saugreinigungsgeräte sind beispielsweise aus der DE 298 23 411 U1 bekannt, in der vorgeschlagen wird, zur Filterabreinigung den Saugeinlass zu verschließen, so dass sich innerhalb des Schmutzsammelbehälters ein starker Unterdruck ausbildet. Anschließend soll dann ein Schließventil geöffnet und dadurch ein Filter abgereinigt werden. Es kann dadurch eine wirkungsvolle Abreinigung erzielt werden, allerdings muss hierzu der Saugbetrieb vollständig unterbrochen werden. Um diesem Nachteil entgegenzuwirken, wird in der DE 199 49 095 A1 vorgeschlagen, jeweils nur einen Teilbereich des Filters abzureinigen, so dass über einen anderen Teilbereich der Saugbetrieb aufrechterhalten werden kann. Einzelne Teilbereiche des Filters werden somit nacheinander abgereinigt, ohne dass der Saugbetrieb unterbrochen werden muss. Die Zuführung von Fremdluft jeweils nur an einen Teilbereich des Filters erfordert aber eine konstruktiv aufwendige Mechanik für das Schließventil.Such Saugreinigungsgeräte are for example from the DE 298 23 411 U1 in which it is proposed to close the suction inlet for filter cleaning, so that forms a strong negative pressure within the dirt collecting container. Subsequently, a closing valve is then opened, thereby cleaning a filter. It can be achieved by an effective cleaning, but this must be completely interrupted the suction operation. To counteract this disadvantage, is in the DE 199 49 095 A1 proposed to clean only a portion of the filter, so that over another portion of the suction operation can be maintained. Individual sections of the filter are thus cleaned in succession, without the suction must be interrupted. However, the supply of external air in each case only to a portion of the filter requires a structurally complex mechanism for the closing valve.

Aufgabe der vorliegenden Erfindung ist es, ein Saugreinigungsgerät der eingangs genannten Art derart weiterzubilden, dass das mindestens eine Schließventil konstruktiv einfach ausgestaltet und das zumindest eine Filter innerhalb kurzer Zeit vollständig abgereinigt werden kann.Object of the present invention is to provide a Saugreinigungsgerät of the type mentioned in such a way that the at least one closing valve structurally simple design and the at least one filter can be completely cleaned within a short time.

Diese Aufgabe wird bei einem Saugreinigungsgerät der gattungsgemäßen Art erfindungsgemäß dadurch gelöst, dass das Quadrat der Gesamtlänge aller Dichtungslinien mindestens das 25-fache der Gesamtgröße aller von den Dichtungslinien begrenzten, mit Differenzdruck beaufschlagten Flächen beträgt, und dass das Saugaggregat auch während einer Filterabreinigung mit dem mindestens einen Filter in Strömungsverbindung steht.This object is achieved in a Saugreinigungsgerät of the generic type according to the invention that the square of the total length of all seal lines is at least 25 times the total size of all limited by the seal lines, acted upon by differential pressure surfaces, and that the suction unit even during a filter cleaning with the at least a filter is in flow communication.

In die Erfindung fließt der Gedanke mit ein, dass durch Bereitstellung von einer oder mehreren möglichst langen Dichtungslinien, die jedoch eine möglichst geringe Fläche begrenzen, beim Abheben des Ventilkörpers vom Ventilsitz innerhalb sehr kurzer Zeit eine starke, schlagartig einsetzende Fremdluftströmung bereitgestellt werden kann, so dass auf der dem Schmutzsammelbehälter abgewandten Seite des mindestens einen Filters der Unterdruck schlagartig abfällt und das Filter in Gegenstromrichtung mit Fremdluft durchströmt wird. Der schlagartige Druckanstieg hat zur Folge, dass das Filter mechanisch erschüttert und abgereinigt wird, wobei die Abreinigung innerhalb sehr kurzer Zeit erfolgen kann. Die Gesamtlänge aller Dichtungslinien ist deutlich größer gewählt als der Umfang einer Kreisfläche, deren Flächeninhalt dem Flächeninhalt der von den Dichtungslinien begrenzten Fläche entspricht. Das Verhältnis zwischen dem Quadrat der Gesamtlänge aller Dichtungslinien und der Größe der von den Dichtungslinien insgesamt begrenzten Fläche beträgt erfindungsgemäß mindestens 25 und ist damit mindestens doppelt so groß wie im Falle, dass nur eine Dichtungslinie vorliegt, die eine geschlossene Kreisfläche umgibt, deren Umfang von der Dichtungslinie definiert wird. Im Falle einer Kreisfläche ergibt sich für das Verhältnis aus dem Quadrat der Länge der Dichtungslinie und der Größe der Kreisfläche ein Wert von ungefähr 12,5, nämlich dem vierfachen der Zahl π (3,14).In the invention, the idea flows in that by providing one or more seal lines as long as possible, but which limit the smallest possible area, a strong, abrupt onset of external air flow can be provided during lifting of the valve body from the valve seat within a very short time, so that on the side facing away from the dirt collecting container of the at least one filter, the negative pressure drops abruptly and the filter is flowed through in the counter-current direction with external air. The sudden pressure increase has the consequence that the filter is mechanically shaken and cleaned, whereby the cleaning can be done within a very short time. The total length of all sealing lines is chosen to be significantly larger than the circumference of a circular area whose surface area corresponds to the area of the surface bounded by the sealing lines. The ratio between the square of the total length of all sealing lines and the size of the total of the sealing lines limited area is according to the invention at least 25 and is thus at least twice as large as in the case that there is only one seal line surrounding a closed circular area whose circumference of the Sealing line is defined. In the case of a circular area, the ratio of the square of the length of the sealing line and the size of the circular area gives a value of approximately 12.5, namely four times the number π (3.14).

Unter der von der mindestens einen Dichtungslinie begrenzten Fläche wird diejenige Fläche bezeichnet, die in der Schließstellung des Schließventils mit der sich über das Schließventil ausbildenden Druckdifferenz beaufschlagt wird. Diese Fläche wird von der mindestens einen Dichtungslinie begrenzt, und erfindungsgemäß ist vorgesehen, dass bei Bereitstellung einer möglichst langen Dichtungslinie die mit dem Differenzdruck beaufschlagte Fläche möglichst gering gewählt wird. Da die vom Differenzdruck beaufschlagte Fläche die Kraft bestimmt, mit der das Schließventil in seiner Schließstellung beaufschlagt wird, kann durch Bereitstellung einer möglichst kleinen Fläche die mechanische Belastung des Schließventils reduziert werden. Dies wiederum hat zur Folge, dass das Schließventil eine geringe Baugröße aufweisen kann, und dennoch kann über die mindestens eine, möglichst lang gewählte Dichtungslinie beim Öffnen des Schließventils eine starke Fremdluftströmung bereitgestellt werden zur Abreinigung des Filters.The area delimited by the at least one sealing line denotes that area which, in the closed position of the closing valve, is acted on by the pressure difference which forms via the closing valve. This surface is delimited by the at least one sealing line, and according to the invention it is provided that, when providing the longest possible sealing line, the area subjected to the differential pressure is chosen as small as possible. Since the surface acted upon by the differential pressure determines the force with which the closing valve is acted upon in its closed position, the mechanical load of the closing valve can be reduced by providing the smallest possible area. This in turn has the consequence that the closing valve may have a small size, and yet on the at least one, as long as possible selected sealing line when opening the closing valve, a strong external air flow can be provided for cleaning the filter.

Von besonderem Vorteil ist es, wenn das Quadrat der Gesamtlänge aller Dichtungslinien mindestens das 50-fache, vorzugsweise mehr als das 100-fache der Gesamtgröße aller von den Dichtungslinien begrenzten Flächen beträgt. Es wird somit eine sehr lange Linie bereitgestellt, entlang derer der Fremdlufteinlass abgedichtet wird. Über diese Dichtungslinie kann beim Öffnen des Schließventils dem Filter Fremdluft zugeführt werden. Dies ermöglicht es, selbst bei sehr kurzzeitiger Öffnung des Schließventils eine wirkungsvolle Filterabreinigung zu erzielen. Zur Filterabreinigung muss daher der Saugbetrieb nur für Bruchteile einer Sekunde unterbrochen werden. Dies hat zur Folge, dass am freien Ende eines an den Saugeinlass angeschlossenen Saugschlauches praktisch keine Unterbrechung der Saugströmung auftritt, es kann somit ein quasi kontinuierlicher Saugbetrieb aufrecht erhalten werden mit annähernd konstanter Saugleistung, das heißt mit annähernd konstantem Saugvolumenstrom. Das erfindungsgemäße Saugreinigungsgerät zeichnet sich daher durch eine hohe Wirksamkeit aus.It is particularly advantageous if the square of the total length of all sealing lines amounts to at least 50 times, preferably more than 100 times, the total size of all the surfaces delimited by the sealing lines. There is thus provided a very long line along which the outside air inlet is sealed. About this seal line can be supplied to the filter external air when opening the closing valve. This makes it possible to achieve effective filter cleaning even with very short opening of the closing valve. For filter cleaning therefore the suction must be interrupted only for fractions of a second. This has the consequence that virtually no interruption of the suction flow occurs at the free end of a suction hose connected to the suction inlet, thus a quasi-continuous suction operation can be maintained with approximately constant suction power, that is with approximately constant suction volume flow. The vacuum cleaning device according to the invention is therefore characterized by a high degree of effectiveness.

Das mindestens eine Schließventil kann eine einzige Dichtungslinie aufweisen, beispielsweise eine sternförmig oder in Form des Randes eines Kleeblattes ausgestaltete Dichtungslinie mit abwechselnd positiver und negativer Krümmung.The at least one closing valve may have a single sealing line, for example a star-shaped or in the form of the edge of a clover designed seal line with alternating positive and negative curvature.

Als besonders vorteilhaft hat es sich erwiesen, wenn das mindestens eine Schließventil mehrere Dichtungslinien aufweist in Form geschlossener Dichtungsstrecken. So können beispielsweise zwei Dichtungsstrecken zum Einsatz kommen, die einen Außenrand und einen Innenrand einer vom Differenzdruck beaufschlagten Fläche definieren.It has proved to be particularly advantageous if the at least one closing valve has a plurality of sealing lines in the form of closed sealing sections. Thus, for example, two sealing sections can be used which define an outer edge and an inner edge of a surface acted upon by the differential pressure.

Die geschlossenen Dichtungsstrecken können nebeneinander angeordnet sein. Vorzugsweise bilden die Dichtungsstrecken jedoch ineinander liegende Dichtungsringe aus. Bevorzugt sind die Dichtungsringe konzentrisch zueinander angeordnet. Beispielsweise können vier Dichtungsringe zum Einsatz kommen, die konzentrisch zueinander angeordnet sind, wobei jeweils zwei Dichtungsringe eine ringförmige, vom Differenzdruck beaufschlagte Fläche begrenzen. In diesem Falle ergibt sich die insgesamt von den Dichtungslinien begrenzte Fläche aus der Summe der beiden Ringflächen.The closed sealing sections can be arranged side by side. Preferably, however, the sealing sections form nested sealing rings. Preferably, the sealing rings are arranged concentrically with each other. For example, four sealing rings can be used, which are arranged concentrically to each other, wherein each two sealing rings define an annular, acted upon by the differential pressure surface. In this case, the total of the sealing lines limited area results from the sum of the two annular surfaces.

Die Dichtungsringe können über ihren gesamten Umfang in gleichmäßigem Abstand zueinander angeordnet sein, es kann allerdings auch vorgesehen sein, dass sich einzelne Dichtungsringe berühren.The sealing rings can be arranged over their entire circumference at a uniform distance from each other, but it can also be provided that touch individual sealing rings.

Bevorzugt sind die Dichtungsstrecken rund ausgestaltet und bilden beispielsweise ein Oval oder einen Kreis.Preferably, the sealing sections are designed to be round and form, for example, an oval or a circle.

Kommt nur eine Dichtungslinie zum Einsatz, so ist diese bevorzugt in einer Ebene angeordnet. Im Falle des Einsatzes von mehreren Dichtungslinien kann jedoch auch vorgesehen sein, dass die einzelnen Dichtungslinien in unterschiedlichen Ebenen angeordnet sind, beispielsweise in zueinander versetzten oder verkippten Ebenen.If only one sealing line is used, it is preferably arranged in one plane. In the case of using multiple sealing lines can However, also be provided that the individual sealing lines are arranged in different planes, for example, in staggered or tilted planes.

Bei einer konstruktiv besonders einfachen und störungsunanfälligen Ausgestaltung des mindestens einen Schließventils weist der Ventilkörper einen Ventilteller auf, der unter Zwischenlage von mindestens einem eine Dichtungslinie definierenden Dichtungselement an den mindestens einen Ventilsitz dicht anlegbar ist. Der Ventilteller kann sehr flach ausgebildet sein, so dass das Schließventil nur einen sehr geringen Bauraum erfordert.In a structurally particularly simple and störungsunanfälligen embodiment of the at least one closing valve, the valve body on a valve disc which is tightly applied to the at least one valve seat with the interposition of at least one sealing line defining a sealing element. The valve disk can be formed very flat, so that the closing valve requires only a very small space.

Von Vorteil ist es, wenn der Ventilteller zumindest eine, vorzugsweise ringförmige Durchlassöffnung aufweist, die in der Schließstellung des Ventiltellers von einem oder mehreren Dichtungselementen begrenzt ist. Eine derartige Ausgestaltung hat den Vorteil, dass beim Abheben des Ventiltellers vom Ventilsitz Fremdluft zum einen seitlich neben dem Ventilteller in die Saugleitung einströmen kann, zum anderen aber auch durch die mindestens eine Durchlassöffnung des Ventiltellers hindurch. Selbst wenn sich der Ventilteller nur geringfügig vom Ventilsitz abhebt, kann bereits eine starke Fremdluftströmung erzielt werden. Dies hat nicht nur den Vorteil, dass für den Ventilteller nur ein geringer Bewegungsspielraum sichergestellt werden muss, sondern dies hat darüber hinaus den Vorteil, dass bereits eine sehr kurzzeitige Öffnungsbewegung ausreichend ist, um das mindestens eine Filter schlagartig mit Fremdluft zu beaufschlagen und dadurch eine wirkungsvolle Abreinigung zu erzielen.It is advantageous if the valve disk has at least one, preferably annular passage opening, which is delimited by one or more sealing elements in the closed position of the valve disk. Such a configuration has the advantage that, when lifting the valve disk from the valve seat, external air can flow into the suction line laterally next to the valve disk, but also through the at least one passage opening of the valve disk. Even if the valve plate lifts only slightly from the valve seat, already a strong external air flow can be achieved. This not only has the advantage that only a small range of motion for the valve disc must be ensured, but this has the advantage that even a very short opening movement is sufficient to abruptly act on the at least one filter with external air and thus an effective To achieve cleaning.

Bei einer besonders bevorzugten Ausführungsform weist der mindestens eine Ventilsitz mehrere Durchgangsöffnungen auf, die in der Schließstellung des Ventiltellers jeweils von mindestens einem Dichtungselement begrenzt sind. Es kann beispielsweise vorgesehen sein, dass der mindestens eine Ventilsitz zwei konzentrisch zueinander angeordnete ringförmige Durchgangsöffnungen umfasst, über die beim Abheben des Ventiltellers vom Ventilsitz Fremdluft in die Saugleitung einströmen kann.In a particularly preferred embodiment, the at least one valve seat has a plurality of passage openings, which are each delimited by at least one sealing element in the closed position of the valve disk. It can be provided, for example, that the at least one valve seat has two concentrically arranged annular through openings comprises, on the lifting of the valve disk from the valve seat external air can flow into the suction line.

Der Ventilkörper kann verschwenkbar an dem mindestens einen Ventilsitz oder an einem gerätefesten Teil gelagert sein. Von besonderem Vorteil ist es jedoch, wenn der Ventilkörper verschiebbar gehalten ist, insbesondere kann vorgesehen sein, dass der Ventilkörper in einer Führung verschiebbar gehalten ist.The valve body may be pivotably mounted on the at least one valve seat or on a device-fixed part. It is particularly advantageous, however, if the valve body is held displaceably, in particular it can be provided that the valve body is held displaceably in a guide.

Die Führung ist bei einer vorteilhaften Ausführungsform zylinderförmig ausgebildet, denn dies gibt die Möglichkeit, den Ventilkörper um die Zylinderachse der Führung zu verdrehen, ohne dass dadurch die Öffnungs- und Schließbewegung des Ventilkörpers beeinträchtigt wird. Durch die Bereitstellung einer zylinderförmigen Führung wird also die Gefahr vermindert, dass der Ventilkörper verkantet.The guide is cylindrical in an advantageous embodiment, because this gives the possibility to rotate the valve body about the cylinder axis of the guide, without thereby affecting the opening and closing movement of the valve body. By providing a cylindrical guide so the risk is reduced that the valve body tilted.

Es kann vorgesehen sein, dass das mindestens eine Schließventil eine Führungshülse aufweist, in die eine Führungsaufnahme eintaucht. Die Führungshülse kann am Ventilkörper angeordnet sein, vorzugsweise ist die Führungshülse einstückig mit dem Ventilkörper verbunden.It can be provided that the at least one closing valve has a guide sleeve into which a guide receptacle dips. The guide sleeve can be arranged on the valve body, preferably the guide sleeve is integrally connected to the valve body.

Günstig ist es, wenn der Ventilkörper durch eine Feder mit einer Schließkraft beaufschlagt ist. Die Feder bewegt den sich beim Öffnen des Schließventils vom Ventilsitz abhebenden Ventilkörper in seine Schließstellung zurück, sobald der Unterdruck in der Saugleitung stromabwärts des mindestens einen Filters durch die Wirkung des Saugaggregates abgebaut ist. Das Saugaggregat steht nämlich auch während der Filterabreinigung mit dem mindestens einen Filter in Strömungsverbindung, so dass die über das Schließventil in die Saugleitung einströmende Fremdluft, die kurzzeitig das Filter in Gegenstromrichtung beaufschlagt, vom Saugaggregat abgesaugt wird. In der Schließstellung sorgt die Feder für eine zuverlässige Fixierung des Ventilkörpers. Beim Öffnen des Schließventils nimmt die Feder die Energie des Ventilkörpers auf, bremst diesen ab und beschleunigt ihn wieder zurück in seine Schließstellung.It is advantageous if the valve body is acted upon by a spring with a closing force. The spring moves the opening when the closing valve from the valve seat lifting valve body back into its closed position as soon as the negative pressure in the suction line downstream of the at least one filter is degraded by the action of the suction unit. The suction unit is in fact during the filter cleaning with the at least one filter in flow communication, so that the inflowing via the closing valve in the suction line foreign air, which briefly acts on the filter in the counterflow direction is sucked from the suction unit. In the closed position ensures the spring for a reliable fixation of the valve body. When opening the closing valve, the spring absorbs the energy of the valve body, brakes it and accelerates it back to its closed position.

Die Feder kann mehrteilig, insbesondere zweiteilig ausgestaltet sein, wobei ein längeres Federteil eine geringere Federkonstante aufweisen kann als ein kürzeres Federteil. Das kürzere Federteil mit der höheren Federkonstante begrenzt den Öffnungsweg des Ventilkörpers und damit auch die eindringende Fremdluftmenge.The spring may be designed in several parts, in particular in two parts, wherein a longer spring part may have a lower spring constant than a shorter spring part. The shorter spring part with the higher spring constant limits the opening travel of the valve body and thus also the ingress of foreign air.

Alternativ kann vorgesehen sein, dass eine einzige Feder zum Einsatz kommt, die bevorzugt eine nicht lineare Kennlinie aufweist, so dass die Bewegung des Ventilkörpers zu Beginn nur wenig und dann stärker gehemmt wird. Dadurch kann beim Öffnen des Schließventils ein sehr starker Druckstoß erzielt werden, durch den das mindestens eine Filter in kürzester Zeit abgereinigt werden kann.Alternatively it can be provided that a single spring is used, which preferably has a non-linear characteristic, so that the movement of the valve body at the beginning is only slightly and then more inhibited. As a result, when opening the closing valve, a very strong pressure surge can be achieved by which the at least one filter can be cleaned in a very short time.

Alternativ oder ergänzend zur Feder kann vorgesehen sein, dass der Ventilkörper durch eine Magnethalterung in der Schließstellung gehalten ist. Hierzu kann beispielsweise mindestens ein Permanentmagnet zum Einsatz kommen, der den Ventilkörper bei Druckdifferenzen, wie sie sich während des ordnungsgemäßen Saugbetriebes an dem mindestens einen Schließventil einstellen, zuverlässig in seiner Schließstellung hält. Wird zur Filterabreinigung die Druckdifferenz erhöht, so gibt die Magnethalterung den Ventilkörper frei, der anschließend vom Ventilsitz abhebt, so dass Fremdluft einströmen kann. Die Druckdifferenz kann beispielsweise dadurch erhöht werden, dass der Unterdruck innerhalb des Schmutzsammelbehälters verstärkt wird, beispielsweise durch Verschließen des Saugeinlasses oder eines an diesem angeschlossenen Saugschlauches. Alternativ oder ergänzend kann die Druckdifferenz dadurch erhöht werden, dass Fremdluft mit Überdruck dem mindestens einen Schließventil zugeführt wird. Hierzu kann das Saugreinigungsgerät einen Druckspeicher aufweisen, der mit einem Kompressor befüllt wird. Wird aus dem Druckspeicher Fremdluft freigegeben, so übt der sich ausbildende Überdruck auf den Ventilkörper eine verstärkte Kraft in Öffnungsrichtung aus, die von der Magnethalterung nicht mehr kompensiert werden kann, so dass das mindestens eine Schließventil öffnet. Wird die Zufuhr von unter Druck gesetzter Fremdluft unterbrochen, so baut sich anschließend der Überdruck ab, und unter der Wirkung der Magnetkraft, gegebenenfalls unterstützt durch die Wirkung einer Schließfeder, geht der Ventilkörper wieder in seine Schließstellung über.Alternatively or in addition to the spring can be provided that the valve body is held by a magnetic holder in the closed position. For this purpose, for example, at least one permanent magnet can be used, which reliably holds the valve body in its closed position in the case of pressure differences as they occur during the proper suction operation at the at least one closing valve. If the pressure difference is increased for filter cleaning, the magnetic holder releases the valve body, which then lifts off from the valve seat, so that external air can flow in. The pressure difference can be increased, for example, by the fact that the negative pressure within the dirt collecting container is increased, for example by closing the suction inlet or a suction hose connected to this. Alternatively or additionally, the pressure difference can be increased by the fact that external air with overpressure the at least one closing valve is supplied. For this purpose, the vacuum cleaning device may have a pressure accumulator which is filled with a compressor. If external air is released from the pressure accumulator, then the overpressure exerted on the valve body exerts an increased force in the opening direction, which force can no longer be compensated by the magnet holder, so that the at least one closing valve opens. If the supply of pressurized external air is interrupted, then the pressure builds up, and under the action of the magnetic force, possibly supported by the action of a closing spring, the valve body goes back to its closed position.

Von besonderem Vorteil ist es, wenn die Magnethalterung einen Elektromagneten umfasst. Dies ermöglicht eine elektrische Ansteuerung der Magnethalterung dergestalt, dass das Schließventil seine Schließstellung beibehält, solange der Elektromagnet mit Strom beaufschlagt ist. Wird die Stromzufuhr unterbrochen, so öffnet das Schließventil schlagartig.It is particularly advantageous if the magnet holder comprises an electromagnet. This allows an electrical control of the magnetic holder such that the closing valve maintains its closed position, as long as the solenoid is energized. If the power supply is interrupted, the closing valve opens abruptly.

Als besonders vorteilhaft hat es sich erwiesen, den Elektromagneten als Elektrohaftmagnet auszugestalten. Derartige Elektrohaftmagente zeichnen sich durch eine sehr geringe magnetische Remanenz aus, so dass bei Unterbrechung der Stromzufuhr praktisch kein Restmagnetfeld mehr vorliegt und daher der Ventilkörper in sehr kurzer Zeit vom Ventilsitz abheben kann.It has proved to be particularly advantageous to design the electromagnet as an electro-adhesive magnet. Such Elektrohaftmagente are characterized by a very low magnetic remanence, so that when interrupting the power supply virtually no residual magnetic field is present and therefore the valve body can lift off the valve seat in a very short time.

Es kann vorgesehen sein, dass das mindestens eine Schließventil mechanisch betätigbar ist. Von Vorteil ist es jedoch, wenn es elektronisch betätigbar ist. So kann beispielsweise vorgesehen sein, dass mittels Drucksensoren die sich über das Filter ausbildende Druckdifferenz erfasst wird. Je größer die Druckdifferenz ist, desto größer ist der Strömungswiderstand des Filters, und bei Überschreiten eines vorgegebenen Wertes für die Druckdifferenz kann das mindestens eine Schließventil mittels einer Steuerelektronik betätigt werden.It can be provided that the at least one closing valve is mechanically actuated. It is advantageous, however, if it is electronically operable. For example, it may be provided that the pressure difference that forms via the filter is detected by means of pressure sensors. The greater the pressure difference, the greater the flow resistance of the filter, and when a predetermined value for the pressure difference is exceeded, the at least one closing valve can be actuated by means of control electronics.

Von Vorteil ist eine zeitgesteuerte Betätigung des mindestens einen Schließventils. Hierbei kann vorgesehen sein, dass es mit unterschiedlichen zeitlichen Abständen betätigbar ist. Insbesondere kann nach mehreren kürzeren Zeitabständen eine weitere Betätigung erst nach einem längeren Zeitabstand vorgesehen sein. Eine wirkungsvolle Filterabreinigung kann jedoch auch bei einer Filterabreinigung in gleichbleibenden zeitlichen Abständen erzielt werden.A time-controlled actuation of the at least one closing valve is advantageous. It can be provided that it can be actuated with different time intervals. In particular, after a plurality of shorter time intervals, a further actuation may be provided only after a longer time interval. However, effective filter cleaning can also be achieved with filter cleaning at constant time intervals.

Das mindestens eine Filter ist vorzugsweise als Faltenfilter ausgestaltet, beispielsweise in Form einer Filterpatrone oder eines Flachfaltenfilters.The at least one filter is preferably designed as a folded filter, for example in the form of a filter cartridge or a flat pleated filter.

Das Saugreinigungsgerät kann mehrere Filter aufweisen, als besonders vorteilhaft hat es sich jedoch erwiesen, wenn das Saugreinigungsgerät ein einziges Filter umfasst. Insbesondere kann vorgesehen sein, dass das Filter durch gleichzeitiges Öffnen aller Schließventile über seine gesamte Fläche mit Fremdluft beaufschlagbar ist.The vacuum cleaning device may have a plurality of filters, but it has proved to be particularly advantageous if the vacuum cleaning device comprises a single filter. In particular, it can be provided that the filter can be acted upon by external air simultaneously by opening all closing valves over its entire surface.

Wie bereits erläutert, ermöglicht die erfindungsgemäße Ausgestaltung des Saugreinigungsgerätes, den Unterdruck in der Saugleitung in dem dem mindestens einen Filter benachbarten Bereich schlagartig zu erhöhen, und anschließend wird der Unterdruck aufgrund der Wirkung des mindestens einen Saugaggregates innerhalb sehr kurzer Zeit wieder abgebaut. Beim Öffnen des mindestens einen Schließventils kann der Ventilkörper kurzzeitig in einer Offenstellung verharren, um dann wieder in seine Schließstellung überzugehen. Von besonderem Vorteil ist es jedoch, wenn der Ventilkörper ausgehend von seiner Schließstellung über seine Offenstellung kontinuierlich in seine Schließstellung zurück bewegbar ist. Bei einer derartigen Ausgestaltung führt der Ventilkörper beim Öffnen des Schließventils eine kontinuierliche Bewegung aus, ohne dass er in seiner Offenstellung verharrt. Der Ventilkörper wird beim Öffnen des Schließventils stark beschleunigt und anschließend wieder abgebremst, so dass er seine Bewegungsrichtung umkehrt und dann wieder seine Schließstellung einnimmt. Die gesamte Bewegung des Ventilkörpers ausgehend von seiner Schließstellung über die Offenstellung zurück in die Schließstellung kann hierbei in Bruchteilen einer Sekunde erfolgen.As already explained, the inventive design of the vacuum cleaning device makes it possible to abruptly increase the negative pressure in the suction line in the region adjacent to the at least one filter, and then the negative pressure is reduced again within a very short time due to the action of the at least one suction unit. When the at least one closing valve is opened, the valve body can momentarily remain in an open position in order then to change over again into its closed position. However, it is particularly advantageous if, starting from its closed position, the valve body is continuously movable back into its closed position via its open position. In such an embodiment, the valve body performs a continuous movement when opening the closing valve without it remains in its open position. The valve body is greatly accelerated when opening the closing valve and then braked again so that it reverses its direction of movement and then its closed position occupies. The entire movement of the valve body starting from its closed position on the open position back into the closed position can be done in fractions of a second.

Bei einer besonders bevorzugten Ausführungsform ist das mindestens eine Filter mittels des Schließventils für weniger als 200 ms, insbesondere für weniger als 100 ms, mit Fremdluft beaufschlagbar. Eine derartige Beaufschlagung führt für den Benutzer zu keiner merklichen Unterbrechung des Saugbetriebes, sie hat jedoch aufgrund der Bereitstellung einer sehr langen Dichtungslinie für das mindestens eine Schließventil eine wirkungsvolle Abreinigung des Filters zur Folge.In a particularly preferred embodiment, the at least one filter is acted upon by the closing valve for less than 200 ms, in particular for less than 100 ms, with external air. Such loading does not result in any appreciable interruption of the suction operation for the user, but due to the provision of a very long seal line for the at least one closing valve, it results in effective cleaning of the filter.

Bevorzugt ist das mindestens eine Filter mittels des zumindest einen Schließventils unter Aufrechterhaltung eines Unterdrucks im Mündungsbereich eines in den Saugeinlass einmündenden Saugschlauches mit Fremdluft beaufschlagbar. Wird das mindestens eine Schließventil geöffnet, so steigt der Druck auf der dem Schmutzsammelbehälter abgewandten Seite des Filters schlagartig an und wird dann wieder abgebaut. Der schlagartige Druckanstieg bewirkt eine wirkungsvolle Abreinigung des Filters, da er jedoch von der mindestens einen Saugturbine gleich wieder abgebaut wird, führt er nicht zu einer vollständigen Unterbrechung des Unterdruckes im Mündungsbereich des in den Saugeinlass einmündenden Saugschlauches. Es kann vielmehr ein quasi kontinuierlicher Saugbetrieb aufrecht erhalten werden.Preferably, the at least one filter can be acted on by means of the at least one closing valve while maintaining a negative pressure in the mouth region of a suction hose opening into the suction inlet with external air. If the at least one closing valve is opened, the pressure on the side of the filter facing away from the dirt collecting container abruptly increases and is then reduced again. The sudden increase in pressure causes an effective cleaning of the filter, but since it is degraded by the at least one suction turbine immediately again, it does not lead to a complete interruption of the negative pressure in the mouth region of the opening into the suction inlet suction hose. Rather, a quasi-continuous suction operation can be maintained.

Es kann beispielsweise vorgesehen sein, dass bei Anschluss eines 2,5 m langen Saugschlauches mit einem Innendurchmesser von 35 mm während der Beaufschlagung des mindestens einen Filters mit Fremdluft der Unterdruck im Saugschlauch in einem Abstand von 3 cm vom Saugeinlass allenfalls für 150 ms unter 40 % des sich bei geschlossenen Schließventilen ausbildenden Wertes abfällt. An das erfindungsgemäße Saugreinigungsgerät wird üblicherweise ein Standardschlauch mit einem Innendurchmesser von 35 mm und einer Länge von 2,5 m angeschlossen. Während des Saugbetriebes bildet sich im Saugschlauch und im Schmutzsammelbehälter ein Unterdruck aus, der Unterdruck kann im Saugschlauch in einem Abstand von 3 cm vom Saugeinlass beispielsweise ungefähr 50 mbar betragen, falls an das freie Ende des Saugschlauches kein Werkzeug angeschlossen ist, das freie Ende des Saugschlauches also offen ist. Wird das mindestens eine Schließventil zur Filterabreinigung kurzzeitig geöffnet, so fällt der Unterdruck an der bezeichneten Stelle kurzzeitig auf einen Wert von weniger als 20 mbar ab, spätestens nach 150 ms übersteigt der Unterdruck jedoch wieder den Wert von 20 mbar und nähert sich dann wieder dem ursprünglichen Wert von 50 mbar an. Für den Benutzer erfolgt daher keine merkliche Unterbrechung des Saugbetriebes. Es kann beispielsweise vorgesehen sein, dass der Unterdruck an der bezeichneten Stelle für weniger als 100 ms, insbesondere für circa 50 bis etwa 80 ms unter einen Wert von 40 % des sich bei geschlossenen Schließventilen ausbildenden Wertes abfällt.It can be provided, for example, that when connecting a 2.5 m long suction hose with an inner diameter of 35 mm during the application of at least one filter with external air, the negative pressure in the suction hose at a distance of 3 cm from the suction inlet at most for 150 ms below 40% of the value formed when the closing valves are closed. At the Saugreinigungsgerät invention is usually a standard hose with an inside diameter of 35 mm and a length of 2.5 m is connected. During the suction operation, a negative pressure is formed in the suction hose and in the dirt collecting container, the negative pressure in the suction hose at a distance of 3 cm from the suction inlet, for example, about 50 mbar, if no tool is connected to the free end of the suction hose, the free end of the suction hose so it is open. If the at least one closing valve for filter cleaning is opened for a short time, the negative pressure at the designated point briefly drops to a value of less than 20 mbar, but at the latest after 150 ms the negative pressure again exceeds the value of 20 mbar and then approaches the original one again Value of 50 mbar. For the user, therefore, there is no noticeable interruption of the suction operation. It may be provided, for example, that the negative pressure at the designated point for less than 100 ms, in particular for about 50 to about 80 ms drops below a value of 40% of the value formed at closed closing valves value.

Die nachfolgende Beschreibung einer bevorzugten Ausführungsform der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:

Figur 1:
eine schematische Schnittansicht eines erfindungsgemäßen Saugreinigungsgerätes;
Figur 2:
eine vergrößerte Schnittansicht des Saugreinigungsgerätes aus Figur 1 im Bereich eines Schließventils;
Figur 3:
eine ausschnittsweise Draufsicht einer Ventilhalterung des Schließventils;
Figur 4:
eine Schnittansicht längs der Linie 4-4 in Figur 3;
Figur 5:
eine Schnittansicht eines Ventilkörpers des Schließventils;
Figur 6:
eine schaubildliche Darstellung des Ventilkörpers aus Figur 5 und
Figur 7:
den Verlauf des sich im Mündungsbereich eines an das Saugreinigungsgerät angeschlossenen Saugschlauches ausbildenden Unterdruckes beim Betätigen des Schließventils.
The following description of a preferred embodiment of the invention serves in conjunction with the drawings for further explanation. Show it:
FIG. 1:
a schematic sectional view of a Saugreinigungsgerätes invention;
FIG. 2:
an enlarged sectional view of the Saugreinigungsgerätes FIG. 1 in the area of a closing valve;
FIG. 3:
a fragmentary plan view of a valve holder of the closing valve;
FIG. 4:
a sectional view taken along the line 4-4 in FIG. 3 ;
FIG. 5:
a sectional view of a valve body of the closing valve;
FIG. 6:
a perspective view of the valve body FIG. 5 and
FIG. 7:
the course of the forming in the mouth region of a suction hose connected to the vacuum cleaner vacuum when operating the closing valve.

In der Zeichnung ist schematisch ein Saugreinigungsgerät in Form eines Staubsaugers 10 dargestellt mit einem Unterteil, das einen Schmutzsammelbehälter 12 ausbildet, auf den ein Oberteil 14 aufgesetzt ist, das ein Saugaggregat 16 aufnimmt. Der Schmutzsammelbehälter 12 weist ein Volumen bis zu 80 l auf, vorzugsweise ein Volumen von etwa 30 l bis ca. 80 l. Er umfasst einen Saugeinlass 18, an den ein Saugschlauch 20 anschließbar ist, an dessen freiem Ende, das in der Zeichnung zur Erzielung eines besseren Übersicht nicht dargestellt ist, eine Saugdüse angeschlossen werden kann. Alternativ kann vorgesehen sein, dass der Saugschlauch 20 an ein Bearbeitungswerkzeug, beispielsweise ein Bohraggregat oder ein Fräsaggregat, angeschlossen wird, so dass während des Betriebes des Bearbeitungswerkzeuges anfallender Staub abgesaugt werden kann.In the drawing, a vacuum cleaning device in the form of a vacuum cleaner 10 is shown schematically with a lower part, which forms a dirt collecting container 12, on which an upper part 14 is placed, which receives a suction unit 16. The dirt collecting container 12 has a volume of up to 80 l, preferably a volume of about 30 l to about 80 l. It comprises a suction inlet 18, to which a suction hose 20 can be connected, at the free end, which is not shown in the drawing to achieve a better overview, a suction nozzle can be connected. Alternatively, it can be provided that the suction hose 20 is connected to a machining tool, for example a drilling unit or a milling unit, so that dust accumulating during operation of the machining tool can be sucked off.

Das Oberteil 14 bildet einen Saugauslass 22 für den Schmutzsammelbehälter 12 aus, wobei am Saugauslass 22 ein Faltenfilter 24 gehalten ist, an das sich eine Saugleitung in Form eines Saugkanales 26 anschließt, über den das Faltenfilter 24 mit dem Saugaggregat 16 in Strömungsverbindung steht. Über den Saugkanal 26 und das Faltenfilter 24 kann der Schmutzsammelbehälter 12 vom Saugaggregat 16 mit Unterdruck beaufschlagt werden, so dass sich eine in Figur 1 durch die Pfeile 28 symbolisierte Saugströmung ausbildet, unter deren Wirkung Schmutz in den Schmutzsammelbehälter 12 eingesaugt werden kann. Mittels des Faltenfilters 24 können die Schmutzteilchen aus der Saugströmung 28 abgeschieden werden.The upper part 14 forms a suction outlet 22 for the dirt collecting container 12, wherein at the suction outlet 22, a pleated filter 24 is held, to which a suction line in the form of a suction channel 26 connects, via which the pleated filter 24 is in flow connection with the suction unit 16. About the suction channel 26 and the pleated filter 24, the dirt collecting 12 can be acted upon by the suction unit 16 with negative pressure, so that a in FIG. 1 symbolized by the arrows 28 Saugströmung forms, below their effect dirt can be sucked into the dirt collector 12. By means of the fold filter 24, the dirt particles from the suction flow 28 can be deposited.

Oberhalb des Faltenfilters 24 ist im Oberteil 14 ein Schließventil 30 angeordnet, das in Figur 2 vergrößert dargestellt ist. Es umfasst eine ortsfest im Oberteil 14 angeordnete Ventilhalterung 32, die einen Ventilsitz ausbildet und mit einem Ventilkörper in Form eines Ventiltellers 34 zusammenwirkt. Der Ventilteller 34 ist mittels einer Schließfeder 36 mit nicht linearer Kennlinie in Richtung auf die Ventilhalterung 32 mit einer Schließkraft beaufschlagt. Die Schließfeder 36 ist zwischen einer plattenartigen, ortsfest im Oberteil 14 angeordneten Filterhalterung 38 und dem Ventilteller 34 eingespannt.Above the pleated filter 24, a closing valve 30 is arranged in the upper part 14, which in FIG. 2 is shown enlarged. It comprises a stationary in the upper part 14 arranged valve holder 32 which forms a valve seat and cooperates with a valve body in the form of a valve plate 34. The valve disk 34 is acted upon by a closing spring 36 with a non-linear characteristic in the direction of the valve holder 32 with a closing force. The closing spring 36 is clamped between a plate-like, in the upper part 14 arranged filter holder 38 and the valve plate 34.

Wie insbesondere aus den Figuren 3 und 4 deutlich wird, weist die Ventilhalterung 32 zwei konzentrisch zueinander angeordnete, kreisringförmige Durchgangsöffnungen 40, 42 auf, die in der Schließstellung des Schließventils 30 von dem Ventilteller 34 dicht verschlossen werden. Die Durchgangsöffnungen 40 und 42 sind in eine Haltescheibe 44 der Ventilhalterung 23 eingeformt, wobei die Haltescheibe 44 durch die Durchgangsöffnungen 40 und 42 in einen Außenring 45 und einen Innenring 46 unterteilt wird, die ein zylinderförmiges Mittelteil 47 konzentrisch umgeben und mittels außenseitig vom Mittelteil 47 in radialer Richtung abstehender Halterippen 49 am Mittelteil 47 festgelegt sind.As in particular from the Figures 3 and 4 becomes clear, the valve holder 32 has two concentric with each other, annular through holes 40, 42, which are sealed in the closed position of the closing valve 30 of the valve plate 34. The through holes 40 and 42 are formed in a retaining plate 44 of the valve holder 23, wherein the retaining plate 44 is divided by the through holes 40 and 42 in an outer ring 45 and an inner ring 46 concentrically surrounding a cylindrical central portion 47 and by means of the outside of the central part 47 in radial direction protruding holding ribs 49 are fixed to the middle part 47.

Das Mittelteil 47 umfasst einen hohlzylinderförmigen Mantel 51, der oberseitig von einer Stirnwand 52 abgedeckt ist und einen Elektrohaftmagneten 54 aufnimmt. Dieser ist innerhalb des Mittelteiles 47 von einem Ringraum 55 umgeben und steht über in der Zeichnung nicht dargestellte Verbindungskabel mit einer in der Zeichnung ebenfalls nicht dargestellten Steuereinheit des Staubsaugers 10 in elektrischer Verbindung.The central part 47 comprises a hollow cylindrical shell 51, which is covered on the upper side by an end wall 52 and receives an electro-magnet 54. This is surrounded by an annular space 55 within the middle part 47 and is connected via a connection cable, not shown in the drawing, to a control unit of the vacuum cleaner 10, likewise not shown in the drawing, in electrical connection.

Der Ventilteller 34 weist eine kreisringförmige Durchlassöffnung 57 auf, die von einer Vielzahl von radial ausgerichteten Stützrippen 58 durchgriffen ist, welche einen äußeren Ringbereich 60 des Ventiltellers 34 mit einem kreisförmigen Zentralbereich 61 des Ventiltellers 34 verbinden. Vom Zentralbereich 61 steht in Richtung des Mittelteils 47 der Ventilhalterung 32 eine Führungshülse 63 nach oben ab, die in den Ringraum 55 der Ventilhalterung 32 eintaucht und eine Eisenplatte 64 aufnimmt, die in die Führungshülse 63 eingeklebt ist.The valve disk 34 has an annular passage opening 57, which is penetrated by a plurality of radially aligned support ribs 58, which connect an outer annular region 60 of the valve disk 34 with a circular central region 61 of the valve disk 34. From the central region 61 is in the direction of the central portion 47 of the valve holder 32 from a guide sleeve 63 from above, which dips into the annular space 55 of the valve holder 32 and an iron plate 64 receives, which is glued into the guide sleeve 63.

Der Ventilteller 34 trägt an seiner der Ventilhalterung 32 zugewandten Oberseite einen inneren Dichtring 66, einen mittleren Dichtring 67 und einen äußeren Dichtring 68, die konzentrisch zueinander ausgerichtet sind und jeweils eine Dichtlippe ausbilden. Der innere Dichtring 66 verläuft entlang einer Innenkante 70 der Durchlassöffnung 57, der mittlere Dichtring 67 verläuft entlang einer Außenkante der Durchlassöffnung 57 und der äußere Dichtring 68 verläuft entlang des Außenumfanges 72 des Ventiltellers 34.The valve disk 34 carries on its valve holder 32 facing upper side an inner sealing ring 66, a middle sealing ring 67 and an outer sealing ring 68, which are concentrically aligned with each other and each form a sealing lip. The inner sealing ring 66 extends along an inner edge 70 of the passage opening 57, the middle sealing ring 67 runs along an outer edge of the passage opening 57 and the outer sealing ring 68 extends along the outer periphery 72 of the valve disk 34.

In der Schließstellung des Ventiltellers 34 legt sich der innere Dichtring 66 abdichtend an den Außenrand 74 der Durchgangsöffnung 40 der Ventilhalterung 32 an, und der mittlere Dichtring 67 sowie der äußere Dichtring 68 legen sich abdichtend an eine Innenkante 75 bzw. eine Außenkante 76 der Durchgangsöffnung 42 an. Die Dichtringe 66, 67 und 68 definieren somit kreisringförmige Dichtlinien, die eine von der sich am Schließventil 30 ausbildenden Druckdifferenz beaufschlagte Fläche begrenzen. Der innere Dichtring 66 begrenzt hierbei eine erste, kreisförmige Teilfläche mit einem Radius R1, und die Dichtringe 67 und 68 begrenzen eine zweite, kreisringförmige Teilfläche mit einem Innenradius R2 und einem Außenradius R3. Insgesamt weist somit das Schließventil 30 eine durch die Dichtringe 66, 67 und 68 definierte Dichtlinie auf, deren Länge sich aus der Summe der Länge der Dichtringe 66, 67 und 68 ergibt. Die so gebildete Dichtlinie begrenzt eine von der sich am Schließventil 30 ausbildenden Druckdifferenz beaufschlagte Fläche, die sich aus der Summe der erläuterten ersten und zweiten Teilflächen ergibt. Das Quadrat der Gesamtlänge der Dichtlinie ist erheblich größer als das 25-fache der von der Dichtlinie begrenzten Fläche. Verglichen mit einer Kreisfläche, deren Umfang der Gesamtlänge der Dichtlinie entspricht, ist die von der Dichtlinie tatsächlich begrenzte Fläche deutlich kleiner als 50 % der Kreisfläche. Dies hat zur Folge, dass sich beim Öffnen des Schließventils 30 eine intensive Fremdluftströmung ausbilden kann, durch die im Bereich zwischen dem Faltenfilter 24 und dem Schließventil 30 der Unterdruck schlagartig abfällt, so dass das Faltenfilter 24 mit einem Druckstoß beaufschlagt wird und kurzzeitig entgegen der Saugströmung 28, also in Gegenstromrichtung, von Fremdluft durchströmt wird, die über eine seitliche Öffnung 78 in das Oberteil 14 einströmen kann. Die Fremdluftströmung ist in Figur 2 durch die Pfeile 80 veranschaulicht.In the closed position of the valve disk 34, the inner sealing ring 66 sealingly engages the outer edge 74 of the through hole 40 of the valve holder 32, and the middle seal 67 and the outer seal 68 sealingly lie against an inner edge 75 and an outer edge 76 of the passage opening 42nd at. The sealing rings 66, 67 and 68 thus define annular sealing lines which delimit a surface acted upon by the pressure difference forming at the closing valve 30. The inner sealing ring 66 in this case limits a first, circular partial surface having a radius R1, and the sealing rings 67 and 68 delimit a second, annular partial surface with an inner radius R2 and an outer radius R3. Overall, therefore, the closing valve 30 has a defined by the sealing rings 66, 67 and 68 sealing line, the length of which results from the sum of the length of the sealing rings 66, 67 and 68. The sealing line formed in this way delimits a surface which is acted upon by the pressure difference forming at the closing valve 30 from the sum of the explained first and second partial surfaces. The square of the total length of the sealing line is considerably larger than 25 times the area bounded by the sealing line. Compared with a circular area whose circumference corresponds to the total length of the sealing line, the area actually bounded by the sealing line is significantly smaller than 50% of the circular area. This has the consequence that when opening the closing valve 30, an intense external air flow can form, drops in the area between the pleated filter 24 and the closing valve 30, the negative pressure abruptly, so that the pleated filter 24 is acted upon by a pressure surge and briefly against the suction flow 28, so in the counterflow direction, is flowed through by external air, which can flow via a lateral opening 78 in the upper part 14. The external air flow is in FIG. 2 illustrated by the arrows 80.

Nimmt das Schließventil 30 seine Schließstellung ein, so bildet sich im Schmutzsammelbehälter 12 sowie im Saugkanal 26 ein Unterdruck aus. Wird an den Saugeinlass 18 ein Saugschlauch mit einer Länge von 2,5 m angeschlossen, der einen Innendurchmesser von 35 mm aufweist, so beträgt der Unterdruck im Mündungsbereich des Saugschlauches, nämlich in einem Abstand von 3 cm vom Saugeinlass 18, ungefähr 50 mbar, sofern an das freie Ende des Saugschlauches kein Werkzeug und auch keine Saugdüse angeschlossen ist. Figur 7 zeigt den Verlauf von entsprechenden Druckmessungen. Wird zur Betätigung des Schließventils 30 die Stromzufuhr des Elektrohaftmagneten 54 unterbrochen, so entfällt schlagartig die Magnetkraft, mit der die Eisenplatte 64 am Elektrohaftmagneten gehalten wird. Dies hat zur Folge, dass sich der Ventilteller 34 unter der Wirkung der am Schließventil 30 herrschenden Druckdifferenz entgegen der Schließkraft der Schließfeder 36 von der Ventilhalterung 32 abhebt. Die Schließfeder 36 nimmt die Energie des Ventiltellers 34 auf, bremst diesen ab und beschleunigt ihn anschließend wieder zurück, so dass er innerhalb kurzer Zeit wieder seine Schließstellung einnimmt und die Durchgangsöffnungen 40 und 42 der Ventilhalterung 32 wieder verschließt. Während der Bewegung des Ventiltellers 34 bildet sich die Fremdluftströmung 80 aus, so dass Fremdluft in Gegenstromrichtung durch das Faltenfilter 24 hindurch in den Schmutzsammelbehälter 12 einströmt und im Mündungsbereich des Saugschlauches 20 der Unterdruck innerhalb von etwa 40 bis circa 60 ms abfällt. Da dann jedoch der Ventilteller 34 bereits wieder seine Schließstellung eingenommen hat und die eingeströmte Fremdluft vom Saugaggregat 16 abgesaugt wird, steigt der Unterdruck anschließend wieder an, um nach etwa 200 ms praktisch seinen ursprünglichen Wert von circa 50 mbar einzunehmen. Werte unterhalb von 40 % des sich bei geschlossenem Schließventil 30 ausbildenden Wertes, also Werte von weniger als 20 mbar, nimmt der Unterdruck im Mündungsbereich des Saugschlauches 20 lediglich für eine Zeitspanne von circa 60 ms ein. Dies hat zur Folge, dass sich für den Benutzer ein quasi kontinuierlicher Saugbetrieb aufrecht erhalten wird und dennoch eine zuverlässige Filterabreinigung gewährleistet ist. Das Schließventil weist hierbei eine kompakte Ausgestaltung auf mit geringer Bauform und kann kostengünstig hergestellt werden.If the closing valve 30 assumes its closed position, a negative pressure is formed in the dirt collecting container 12 and in the suction channel 26. If a suction hose with a length of 2.5 m is connected to the suction inlet 18, which has an inner diameter of 35 mm, then the negative pressure in the mouth region of the suction hose, namely at a distance of 3 cm from the suction inlet 18, is approximately 50 mbar, provided At the free end of the suction hose no tool and no suction nozzle is connected. FIG. 7 shows the course of corresponding pressure measurements. If the current supply of the electro-adhesion magnet 54 is interrupted to actuate the closing valve 30, the magnetic force with which the iron plate 64 is held on the electro-adhesive magnet abruptly ceases. This has the consequence that the valve disc 34 lifts against the closing force of the closing spring 36 of the valve holder 32 under the action of the pressure prevailing on the closing valve 30. The closing spring 36 absorbs the energy of the valve disk 34, brakes it and then accelerates it back again, so that it assumes its closed position again within a short time and the passage openings 40 and 42 of the valve holder 32 closes again. During the movement of the valve disk 34, the external air flow 80 is formed, so that external air flows in the counterflow direction through the pleated filter 24 into the dirt collecting 12 and drops in the mouth region of the suction hose 20, the negative pressure within about 40 to about 60 ms. Since then, however, the valve disc 34 has already taken its closed position again and the inflowing external air is sucked from the suction unit 16, the negative pressure then increases again to take after about 200 ms practically its original value of about 50 mbar. Values below 40% of the value formed when the closing valve 30 is closed, that is to say values of less than 20 mbar, the negative pressure in the mouth region of the suction hose 20 only lasts for a period of approximately 60 ms. This has the consequence that a quasi-continuous suction operation is maintained for the user and yet a reliable filter cleaning is ensured. The closing valve in this case has a compact design with a low design and can be produced inexpensively.

Claims (18)

  1. Vacuum cleaning device comprising a dirt collection container which has a suction inlet and is in flow connection with at least one suction unit via at least one filter and at least one suction line, and comprising at least one external air inlet which opens into the suction line downstream of the at least one filter and can be closed by means of at least one closing valve, the at least one closing valve having a movable valve body which, in a closed position, bears against at least one valve seat so as to form one or more sealing lines, the at least one sealing line delimiting an area which, in the closed position of the closing valve, is acted upon by a differential pressure, characterized in that the square of the total length of all sealing lines is at least 25 times the total size of all areas which are delimited by the sealing lines and acted upon by differential pressure, and in that the suction unit (16) is also in flow connection with the at least one filter (24) during a filter cleaning operation.
  2. Vacuum cleaning device according to Claim 1, characterized in that the square of the total length of all sealing lines is at least 50 times the total size of all areas which are delimited by the sealing lines.
  3. Vacuum cleaning device according to Claim 1 or 2, characterized in that the at least one closing valve (30) has a plurality of sealing lines in the form of closed sealing sections (66, 67, 68).
  4. Vacuum cleaning device according to Claim 3, characterized in that the sealing sections form sealing rings (66, 67, 68) which are situated one within the other.
  5. Vacuum cleaning device according to Claim 3 or 4, characterized in that the sealing sections (66, 67, 68) are disposed in a common plane.
  6. Vacuum cleaning device according to one of the preceding claims, characterized in that the valve body has a valve disk (34) which, with the interposition of at least one sealing element (66, 67, 68) which defines a sealing line, can be engaged sealingly against the at least one valve seat (32).
  7. Vacuum cleaning device according to Claim 6, characterized in that the valve disk (34) has at least one passage opening (57) which is delimited by at least one sealing element (66, 67) in the closed position of the valve disk (34).
  8. Vacuum cleaning device according to Claim 6 or 7, characterized in that the at least one valve seat (32) has a plurality of through openings (40, 42) which are each delimited by at least one sealing element (66, 67, 68) in the closed position of the valve disk (34).
  9. Vacuum cleaning device according to one of the preceding claims, characterized in that the valve body (34) is displaceably mounted in a guide (55).
  10. Vacuum cleaning device according to one of the preceding claims, characterized in that the valve body (34) is subjected to a closing force by a spring (36).
  11. Vacuum cleaning device according to one of the preceding claims, characterized in that the valve body (34) is held in the closed position by a magnetic holder (54).
  12. Vacuum cleaning device according to Claim 11, characterized in that the magnetic holder comprises an electromagnet (54).
  13. Vacuum cleaning device according to Claim 12, characterized in that the electromagnet is configured as a holding solenoid (54).
  14. Vacuum cleaning device according to one of the preceding claims, characterized in that the at least one closing valve (30) can be electronically operated.
  15. Vacuum cleaning device according to one of the preceding claims, characterized in that the valve body (34), starting from its closed position, can be continuously moved back to its closed position via its open position.
  16. Vacuum cleaning device according to one of the preceding claims, characterized in that the at least one filter (24) can be acted upon by external air for less than 200 ms by means of the at least one closing valve (30).
  17. Vacuum cleaning device according to one of the preceding claims, characterized in that the at least one filter (24) can be acted upon by external air by means of the at least one closing valve (30) while maintaining a negative pressure in the mouth region of a suction hose (20) which opens into the suction inlet (18).
  18. Vacuum cleaning device according to Claim 17, characterized in that, when a 2.5 m-long suction hose with an inside diameter of 35 mm is connected while the at least one filter (24) is acted upon by external air, the negative pressure in the suction hose at a distance of 3 cm from the suction inlet (18) falls, at most for 150 ms, below 40% of the value which forms when closing valves are closed.
EP11161193.5A 2005-04-11 2006-01-26 Suction cleaning device Revoked EP2347690B1 (en)

Priority Applications (1)

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PL11161193T PL2347690T3 (en) 2005-04-11 2006-01-26 Suction cleaning device

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DE102005017568.6A DE102005017568B4 (en) 2005-04-11 2005-04-11 Vacuum cleaner
EP06706421A EP1868478B1 (en) 2005-04-11 2006-01-26 Vacuum cleaner

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EP06706421A Division EP1868478B1 (en) 2005-04-11 2006-01-26 Vacuum cleaner

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EP2347690A2 EP2347690A2 (en) 2011-07-27
EP2347690A3 EP2347690A3 (en) 2013-06-19
EP2347690B1 true EP2347690B1 (en) 2015-01-14

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EP11161193.5A Revoked EP2347690B1 (en) 2005-04-11 2006-01-26 Suction cleaning device

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US (1) US8186005B2 (en)
EP (2) EP1868478B1 (en)
AT (1) ATE505123T1 (en)
DE (3) DE102005017568B4 (en)
DK (2) DK1868478T3 (en)
ES (1) ES2361427T3 (en)
PL (2) PL2347690T3 (en)
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US11627863B2 (en) 2017-01-13 2023-04-18 Black & Decker Inc. Dust collection box
WO2021001152A1 (en) 2019-07-03 2021-01-07 Alfred Kärcher SE & Co. KG Suction appliance and method for cleaning a filter
WO2025114345A1 (en) 2023-12-01 2025-06-05 Alfred Kärcher SE & Co. KG Suction device with filter-cleaning device module

Also Published As

Publication number Publication date
EP1868478B1 (en) 2011-04-13
EP2347690A2 (en) 2011-07-27
ES2361427T3 (en) 2011-06-16
DE202006020948U1 (en) 2011-03-03
DE102005017568A1 (en) 2006-10-12
EP1868478A1 (en) 2007-12-26
PL2347690T3 (en) 2015-06-30
WO2006108460A1 (en) 2006-10-19
DE102005017568B4 (en) 2024-04-25
US20080086835A1 (en) 2008-04-17
ATE505123T1 (en) 2011-04-15
PL1868478T3 (en) 2011-09-30
DE502006009299D1 (en) 2011-05-26
EP2347690A3 (en) 2013-06-19
DK2347690T3 (en) 2015-03-09
DK1868478T3 (en) 2011-07-25
US8186005B2 (en) 2012-05-29

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