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WO2008012579A1 - Séparateur cyclone - Google Patents

Séparateur cyclone Download PDF

Info

Publication number
WO2008012579A1
WO2008012579A1 PCT/GB2007/050439 GB2007050439W WO2008012579A1 WO 2008012579 A1 WO2008012579 A1 WO 2008012579A1 GB 2007050439 W GB2007050439 W GB 2007050439W WO 2008012579 A1 WO2008012579 A1 WO 2008012579A1
Authority
WO
WIPO (PCT)
Prior art keywords
cross member
cyclone separator
outlet duct
cyclone
chamber
Prior art date
Application number
PCT/GB2007/050439
Other languages
English (en)
Inventor
David Benjamin Smith
Kevin Smith
Original Assignee
Hoover Limited
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
Application filed by Hoover Limited filed Critical Hoover Limited
Publication of WO2008012579A1 publication Critical patent/WO2008012579A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
    • B04C5/13—Construction of the overflow ducting, e.g. diffusing or spiral exits formed as a vortex finder and extending into the vortex chamber; Discharge from vortex finder otherwise than at the top of the cyclone; Devices for controlling the overflow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/02—Construction of inlets by which the vortex flow is generated, e.g. tangential admission, the fluid flow being forced to follow a downward path by spirally wound bulkheads, or with slightly downwardly-directed tangential admission
    • 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
    • A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
    • 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
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/16—Arrangement or disposition of cyclones or other devices with centrifugal action
    • A47L9/1658—Construction of outlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/02—Construction of inlets by which the vortex flow is generated, e.g. tangential admission, the fluid flow being forced to follow a downward path by spirally wound bulkheads, or with slightly downwardly-directed tangential admission
    • B04C5/06—Axial inlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B04C5/081—Shapes or dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B04C5/103—Bodies or members, e.g. bulkheads, guides, in the vortex chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
    • B04C5/13—Construction of the overflow ducting, e.g. diffusing or spiral exits formed as a vortex finder and extending into the vortex chamber; Discharge from vortex finder otherwise than at the top of the cyclone; Devices for controlling the overflow
    • B04C2005/136—Baffles in the vortex finder

Definitions

  • This invention relates to a cyclonic separator and to a vacuum cleaner incorporating the same.
  • the cleaned air leaves the cyclone chamber through an outlet tube or so-called vortex finder, which projects axially into the cyclone chamber from one end thereof.
  • a substantial part of the noise generated by the cyclone is attributable to the air entering the vortex finder.
  • loud whistling noises can be caused by resonance.
  • EP1653837 attempts to overcome the above-mentioned problem of noise by providing axially extending grooves along the internal surface of the vortex finder.
  • the provision of the grooves is also purported to improve pressure recovery along the flow path of the cleaner.
  • GB2413974 also attempts to overcome the above-mentioned problem of noise by providing an axially extending baffle, which projects radially inwardly from an internal surface of the vortex finder.
  • the baffle may be supplemented by the provision of the grooves disclosed in EP1653837.
  • EP1066115 further attempts to overcome the above-mentioned problem of noise by providing a body or proboscis, which extends along the centre axis of the vortex finder. Although this arrangement is effective at reducing noise, the solution increases the manufacturing cost of the cleaner and renders the cyclone susceptible to blockage by coarse particulate matter.
  • GB2399780 attempts to overcome the problem of blockage by providing a plurality of cyclones without the centre body, as a means of achieving noise reduction whilst avoiding the propensity to blockage.
  • GB2418630 discloses another attempt to overcome the above-mentioned problem by providing a plurality of axially extending baffles, which project radially from the internal surface of the vortex finder from respective circumferentially spaced points.
  • the upstream-end of the baffles are inclined relative to the direction of flow. The provision of the baffles is complex and again renders the vortex finder susceptible to blockage by cause particulate matter.
  • a cyclone separator comprising a cyclone chamber for separating matter contained in a fluid flow, and a fluid inlet duct and a fluid outlet duct communicating with the chamber, the outlet duct extending axially of the rotational axis of the cyclone, wherein a cross member extends across an upstream end of the outlet duct between circumferentially-spaced wall portions thereof.
  • the outlet duct forms a vortex finder for the cyclonic airflow in the cyclone chamber.
  • the provision of the cross member at the upstream end of the outlet duct mechanically stiffens the duct and helps to reduce noise-generating vibrations.
  • the cross member also serves to disrupt the airflow at the inlet to the vortex finder, thereby preventing any airflows which may induce resonance.
  • the cyclone chamber comprises a tubular portion which projects axially into the cyclone chamber, the cross member being provided at the upstream end of said tubular portion.
  • the cross member comprises an upstream end edge, which lies in substantially the same plane as the upstream end edge of the tubular portion of the outlet duct.
  • the cross member extends through the central longitudinal axis of the outlet duct.
  • the cross member extends between diametrically opposed portions of the internal surface of the outlet duct.
  • a plurality of intersecting cross members may be provided.
  • the cross member comprises generally parallel sidewalls, which extend axially of the outlet duct.
  • the cross member comprises generally parallel opposite end walls, which extend normal to the longitudinal axis of the outlet duct.
  • the cross member is confined to a region at the upstream end of the outlet duct having an axial length of no more than 10mm.
  • the region has an axial length of 5mm.
  • the cross member has a width of less than 5mm and preferably 2mm.
  • the cross member is formed integrally with said outlet duct.
  • a vacuum cleaner having a cyclone separator which comprises a cyclone chamber for separating matter contained in a fluid flow, and a fluid inlet duct and a fluid outlet duct communicating with the chamber, the outlet duct extending axially of the rotational axis of the cyclone, wherein a cross member extends across an upstream end of the outlet duct between circumferentially-spaced wall portions thereof.
  • Figure 1 is a sectional view along a longitudinal axis of a cyclone separator in accordance with the present invention
  • Figure 2 is a sectional view along the line M-Il of Figure 1 ;
  • Figure 3 is a perspective view of the upstream end of a vortex finder of the cyclonic separator of Figure 1.
  • a cyclonic separator of the kind typically used in domestic vacuum cleaners.
  • the separator comprises a circular-section tubular sidewall 10, which may be frusto-conical as shown although this is not essential.
  • An inlet duct 14 for the flow of fluid extends tangentially into the upper end of the cyclone through the sidewall 10 thereof.
  • the upper end of the cyclone is closed by an upper end wall 1 1.
  • a tubular outlet duct or so-called vortex finder 12 extends into the cyclone chamber 15 from the upper end wall 11.
  • the central longitudinal axis of the vortex finder 12 is aligned with the central longitudinal axis of the cyclone chamber 15.
  • a rectangular-section cross member 13 extends diametrically across the lower end of the vortex finder 12.
  • the cross member 13 comprises an upstream end edge, which lies in substantially the same plane as the lower end edge of the tubular portion of the vortex finder 12.
  • the cross member 13 comprises generally parallel sidewalls, which extend axially of the vortex finder 12 and generally parallel opposite end walls, which extend normal to the longitudinal axis of the vortex finder 12.
  • the cross member has an axial length of approximately 5mm and a width of approximately 2mm.
  • the upper end of the vortex finder 12 is connected to a fan which draws air through the inlet 14 and out of the chamber 15.
  • the tangential orientation of the inlet 14 with respect to the sidewall 10 of the chamber creates a cyclonic airflow, whereby air spirals downwardly around the chamber 15 towards its lower end.
  • the volume of air in the spiral flow is constantly being diminished by virtue of it having been drawn radially inwardly and upwardly towards the vortex finder 12.
  • dirt and dust in the airflow are forced radially outwardly against the interior of the wall 10 by the radially outwards component of the force acting on the particles.
  • the dirt and dust thus separated remains in an edge zone of the chamber and is carried downwardly by the flow until it reaches the point where the cyclonic flow ceases, whereupon the dirt and dust is deposited at the lower region of the chamber 15.
  • the cross member 13 mechanically stiffens the vortex finder 12 and helps to reduce noise-generating vibrations.
  • the cross member 13 also serves to disrupt the airflow at the inlet to the vortex finder 12, thereby preventing any airflows which may induce resonance.
  • a vacuum cleaner in accordance with the present invention is substantially quieter in operation than a vacuum cleaner which does not have a cross-member extending across the vortex finder 12.
  • the arrangement is mechanically simple and does not significantly affect the passage of any dirt and dust to any downstream separation stage.
  • a cyclone separator comprising a cyclone chamber for separating matter contained in a fluid flow, and a fluid inlet duct and a fluid outlet duct communicating with the chamber, the outlet duct extending axially of the rotational axis of the cyclone, wherein a cross member extends across an upstream end of the outlet duct between circumferentially-spaced wall portions thereof.
  • a cyclone separator as claimed in claim 1 in which the outlet duct is disposed at one end of the chamber, the inlet duct also being disposed at said end of the chamber.
  • a cyclone separator as claimed in any preceding claim in which the cross member extends through the central longitudinal axis of the outlet duct.
  • the cross member comprises generally parallel sidewalls, which extend axially of the outlet duct.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Geometry (AREA)
  • Cyclones (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)

Abstract

L'invention concerne un aspirateur comprenant un séparateur cyclone doté d'une chambre cyclone (15) pour séparer les matières contenues dans un écoulement d'air. Un conduit d'entrée (14) d'écoulement de fluide (5) s'étend de manière tangentielle à l'extrémité supérieure du cyclone via ses parois latérales (10). L'extrémité supérieure de la chambre cyclone (15) est fermée au moyen d'une paroi d'extrémité supérieure (11) et un conduit de sortie tubulaire ou un diaphragme (12) s'étend dans la chambre cyclone (15) à partir de la paroi d'extrémité supérieure (11). Un élément transversal (13) s'étend sur l'extrémité amont du diaphragme (12) entre des parties de parois (10). L'élément transversal (13) raidit de manière mécanique le diaphragme (12) et aide à limiter les vibrations qui génère un bruit; et sert à perturber l'écoulement d'air au niveau de l'entrée du diaphragme (12), ce qui empêche l'entrée d'écoulements d'air quelconques pouvant induire une résonance.
PCT/GB2007/050439 2006-07-27 2007-07-24 Séparateur cyclone WO2008012579A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0614897.7 2006-07-27
GB0614897A GB2440318A (en) 2006-07-27 2006-07-27 Cyclone separator outlet arrangement and noise reduction means

Publications (1)

Publication Number Publication Date
WO2008012579A1 true WO2008012579A1 (fr) 2008-01-31

Family

ID=37006235

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/050439 WO2008012579A1 (fr) 2006-07-27 2007-07-24 Séparateur cyclone

Country Status (2)

Country Link
GB (1) GB2440318A (fr)
WO (1) WO2008012579A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10420867B2 (en) 2015-10-19 2019-09-24 Conmed Corporation Liquid-gas Separator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999049978A2 (fr) * 1998-03-27 1999-10-07 Notetry Limited Appareil de separation cyclonique
WO2000064321A1 (fr) * 1999-04-23 2000-11-02 Lg Electronics Inc. Dispositif destine a reduire les pertes de pression dans un collecteur de poussiere a cyclone
WO2005110608A1 (fr) * 2004-05-12 2005-11-24 Dyson Technology Limited Appareil de separation cyclonique
FR2874313A1 (fr) * 2004-08-23 2006-02-24 Samsung Kwangju Electronics Co Dispositif de collecte de poussieres a cyclone

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999049978A2 (fr) * 1998-03-27 1999-10-07 Notetry Limited Appareil de separation cyclonique
WO2000064321A1 (fr) * 1999-04-23 2000-11-02 Lg Electronics Inc. Dispositif destine a reduire les pertes de pression dans un collecteur de poussiere a cyclone
WO2005110608A1 (fr) * 2004-05-12 2005-11-24 Dyson Technology Limited Appareil de separation cyclonique
FR2874313A1 (fr) * 2004-08-23 2006-02-24 Samsung Kwangju Electronics Co Dispositif de collecte de poussieres a cyclone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10420867B2 (en) 2015-10-19 2019-09-24 Conmed Corporation Liquid-gas Separator

Also Published As

Publication number Publication date
GB0614897D0 (en) 2006-09-06
GB2440318A (en) 2008-01-30

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