DE102010011702A1 - Unit, particularly steam generator for heating of water or steam, particularly for generation of steam with temperature of more than one hundred degree Celsius, has coiled or curved or spiral water circuit with water inlet and steam outlet - Google Patents

Abstract

The unit (11) has a coiled or curved or spiral water circuit (13) with a water inlet (16) and a steam outlet (17). A heating element is provided as radiant heating element. The heating element is arranged outside the water circuit or surrounds the water circuit. The heating element has a space from the water circuit or a wall of the water circuit. The water circuit is flat and extends in a plane.

Description

Field of application and state of the art

The invention relates to a device for heating water or steam, in particular with this device, steam can be produced with a temperature of more than 100 ° C, so-called superheated steam.

It is from the DE 10 2009 010 989 A1 It is known that a steam generator has a helically wound pipe as a water guide, which is wound around a halogen lamp as a radiation heating element. All the radiant heat of the radiant heater is absorbed by the water flow and should serve for rapid and efficient heating of the water, in particular, the low response time is an advantage.

From the US 7,593,625 B2 a similar device is known. In this case, the device is located in a total housing.

Task and solution

The invention has for its object to provide a device mentioned above, can be solved with the problems of the prior art and in particular heated quickly and easily controllable water or steam and in particular steam can be overheated.

This object is achieved by a device having the features of claim 1. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. The wording of the claims is incorporated herein by express reference.

It is envisaged that the device has a water guide, which has a tortuous or curved or spiral shape. The water supply has at least one water inlet and at least one steam outlet, wherein at the outlet of course also heated water can escape instead of steam. The device has at least one heating element designed as a radiation heating element. According to the invention, the heating element is arranged outside the water supply or surrounds the water supply. It has a distance to the water guide or a wall of the water guide, wherein this distance can be relatively small.

Unlike the aforementioned prior art, the invention thus does not surround the water supply the device. In principle, this already makes it possible, on the one hand, that a size restriction for the heating element is largely eliminated, which was previously given by the fact that it had to fit inside the water duct or the interior formed by the tortuous water duct. By a larger radiant heater on the one hand the overall performance and on the other hand, especially the area performance for the heating of the water can be increased in the water supply. A surface load at the radiant heater is thereby lower than in the prior art, which can be made simpler or subject to less wear.

In an advantageous embodiment of the invention, the water supply is flat overall or runs in a plane. So you can take a roughly disc-shaped space. However, the water supply remains in their elongated shape or as a channel, pipe or the like. receive. This will be further explained below.

In a generally flat trained or running in a plane water guide is advantageous at least one heating element formed flat and has a Heizelementfläche, which is not or only slightly smaller than one of the water guide itself occupied area. This allows just the aforementioned lower area performance of the heating element, which is still a uniform heating of the flat running water supply is possible. Advantageously, a flat heating element runs parallel or at a constant distance from the water supply. So a uniform heating or heating effect is achieved.

In an advantageous embodiment of the invention, it is possible that not only on one side of the flat or running in a plane water guide a flat heating element is provided as described above, but heating elements are provided on both sides, which are advantageously similar. By a heating effect on several or both sides of the water supply, so to speak, the heating power can be increased or nearly doubled, without the size of the entire device including water supply is twice as large. Advantageously, the heating elements are identical or identical on both sides, which improves production.

A radiant heating element as a heating element advantageously has a radiation characteristic which essentially goes in one direction. Particularly advantageous is a surface radiation, so that just the surface of the water supply can be heated as well as possible. At the non-facing towards the water supply side, thus at its back, a radiant heater may have a thermal insulation and / or reflector assemblies. These can ensure that, on the one hand, the generated Heat is not lost, but if possible in the water supply and the water is introduced into it. On the other hand, of course, an undesirable or possibly harmful excessive heat release to the outside can be avoided. Thus, the device can also be arranged relatively close to other, possibly heat-sensitive units.

In a further embodiment of the invention, the device may comprise a housing which is closed to the outside substantially. In essence, only a water inlet and a steam outlet can be provided, so that a very good, above-described thermal insulation can be achieved. Such thermal insulation is provided in the form of layered or plate-like material with good thermal insulation properties on the insides of the housing. It is also possible to attach a radiant heater or at least parts thereof to the thermal insulation itself. For this purpose, more will be done below.

In a first basic embodiment possibility of the invention, the water guide is tube-like or channel-like and consists of a tube with a plurality of spiral turns or meandering loops. In this case, the water guide can be wound out of the pipe, if it is spiral windings. In meandering loops, the tube is bent in the appropriate shape and placed just looped side by side. The turns or the loops advantageously each have a small distance from each other or are adjacent to each other. This makes it possible that the water supply is as long as possible and has the largest possible area on which the radiant heating element can heat. Furthermore, no radiation heat can pass through a clearance gap or the like between two turns or loops and lead to an undesired heating of the outer space. The water guide can have a flat overall disk shape and advantageously be round in spiral turns, where they can also be rectangular in loops.

According to a second basic embodiment of the invention, the water guide consists of two surface elements or plates which are arranged parallel to one another and are advantageously fastened to one another. For attachment and for forming the water guide webs are used between the surface elements or plates that connect the plates. Such a formed water guide can in turn, depending on the shape of the webs, form the aforementioned spiral windings or meandering loops. For a water guide with always the same cross-section is advantageously used a plurality of webs which are parallel to each other and, starting from one side, offset from each other. In a production of the water guide made of metal such separate webs can be soldered or welded.

In a third basic embodiment of the invention, the water supply is formed by at least one plate-shaped component, which is embossed in the form of spiral turns on the one hand or meandering loops on the other hand. An embossing can be advantageous in such a way that the embossed areas are all brought together on one level or extend into one plane. On this embossed component either a mirror-image corresponding component can be placed, so that, for example, results in a substantially semicircular embossing a water supply with a circular cross-section. In this case, the formation or embossing of the components can also be such that two identical components are placed on each other and thereby the final water flow results, so that the production cost is lower. Alternatively, as a second component, a substantially flat plate can be placed, which extends to the individual embossings and thus forms the substantially closed water guide. If one of the two sides of the water duct is flat or is formed by an attached flat plate, either this side can point towards the radiant heater or the other having the embossments. Under certain circumstances, the coupling of the radiant heating power into the water flow and thus into the water can thus be improved.

In a further alternative embodiment of the invention, the water supply can be formed from a helically wound pipe in helical form, ie in principle similar to the above-mentioned prior art. This water guide is then illuminated by at least one arranged outside the interior of the water guide Strahlungsheizelement or heated by it. Such radiant heating elements are arranged in an advantageous embodiment of the invention at least two, advantageously even three or four, sides outside the water supply. Thus, they surround the water supply partially or even largely and thus provide a coupling of high heat output in the water supply.

A further improvement of the coupling of the radiant heating power in the water supply can generally be carried out in that the surface of the water supply to the heating element is specially coated or structured. This may be, for example, a darkening or roughening to reduce reflections.

On the one hand, the flow area of the water guide can remain unchanged in its longitudinal course. On the other hand, it can change, either evenly, for example, narrowing, for an increase in pressure. Or it can be changed in certain places, advantageously enlarged in an area in which the water undergoes a temperature change, in which a particularly large amount of lime precipitates, as a rule between about 50 ° C and 65 ° C. This range can be calculated or experimentally determined on a sample. Then just here the cross section can be increased, for example, be doubled about. Thus, the cross-section can fix and clog less quickly with deposits. In an above-described production of two parts, a non-stick coating or the like can easily be made prior to the joining of the two parts. be applied, at least in the spatial area with this temperature transition as mentioned above. Thus, precipitated lime can not settle so well on the inside of the water supply.

An aforementioned distance between radiant heating element and water guide can advantageously be in the range of a few mm, for example 5 mm to 15 mm. In a two-dimensional design of both the water supply and a Strahlungsheizelementes the circumstance of the lateral radiation of radiant heat is negligible, since substantially all of the radiated power is also entered into the water flow.

A radiant heating element, in particular if it is to be designed flat, can be constructed in various ways. Advantageously, it has a heat conductor of wire-like material, which is attached to an insulating or support material. In this case, the heating conductor can run in a spiral wound or meandering loop-like form. He can follow the course of the water, but he does not have to. Particularly preferred is a heating conductor is an upright Flachheizleiterband, which is partially embedded in the carrier material. Such heating elements are known from radiant heaters, which are arranged in hobs below a glass ceramic cooking surface, as for example from the EP 585 831 A is known.

These and other features will become apparent from the claims but also from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in an embodiment of the invention and in other fields be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application in individual sections as well as intermediate headings do not limit the statements made thereunder in their generality.

Brief description of the drawings

Embodiments of the invention are illustrated in the drawings and will be explained in more detail below. In the drawings show:

1 an oblique view of a device according to the invention as a steam generator with a wound from a pipe water flow over a radiant heater,

2 a modification of the device 1 with a water guide formed by two plates with a spiral bridge in between,

3 a modification of the device 2 with several, meandering loops forming webs between the plates,

4 another modification of a device similar 1 with two plates consisting of water guide, the upper plate has an embossing for the water supply and the lower plate is flat,

5 a sectional schematic diagram of a device according to the invention as a steam generator in a completely insulated and enclosed housing with double-sided heating and

6 a further modification of a device according to the invention in a closed housing, with helically wound tube and a radiant heater on three inner sides of the housing.

Detailed description of the embodiments

In 1 is a device according to the invention 11 shown in a flat design with a water guide 13 made of a spirally bent and quasi-wound tube 14 consists. The water supply 13 runs noticeably flat or in a plane and the individual turns of the tube 14 each lie directly against each other. You can be firmly connected together as a unit, for example, soldered or welded in some places. An alternative are retaining clips or retaining webs, which transversely overlap the water supply.

The water supply 13 has a water inlet on the left 16 and in the middle a steam outlet 17 on which, of course, hot water can escape instead of steam. The water can flow from outside to inside or from inside to outside.

Furthermore, below the surface water supply 13 a radiant heater 19 provided, which is distributed over a surface and by a Heizleitererband 20 is formed. This is formed, for example, according to the above-mentioned prior art or on an insulating body 22 attached. The insulating body 22 sits in a carrier cup 24 , which advantageously consists of thin sheet metal. The outer circumference is on the insulating body 22 a Dämmrand 25 placed over the edge of the carrier shell 24 survives and on the water supply 13 rests. From the carrier cup 24 upstanding retaining clips 27 embrace the water supply 13 outside and thus form a solid unit with these.

It can be seen that the whole of the radiant heating 19 radiated heat radiation on the water supply 13 and thus the heat can be well introduced into the water flowing therein for its warming. The water supply 13 or the pipe forming it 14 Obviously have a very long length. This forms on the one hand the fairly large area of the water supply, which is advantageous for heat input. Furthermore, there is generally a very good heating of the water until the formation of steam. It can also be seen that the pipe 14 always has the same, advantageously circular cross-section.

In 2 is an alternative training a water guide 113 at a facility 111 shown. Here are an upper round plate 129 and a round bottom plate 130 connected plane-parallel to each other, via a perpendicular to their surfaces extending long web 132 , This jetty 132 runs noticeable throughout in a spiral shape. The spiral shape of the bridge 132 can be such that a flow area in the water flow 113 similar to in 1 always about the same. Alternatively, the cross-section may change, for example, decrease continuously for a beneficial effect of a slight pressure increase from a water ingress 116 towards a steam outlet 117 ,

The water supply 113 with the two plates 129 and 130 as well as the jetties 132 between forms a firmly connected unit advantageous. This is then again by means of retaining clips 127 on a Dämmrand 125 a carrier shell 124 including insulating body 122 and radiant heating 119 attached.

In the still further modification according to 3 is a water guide 213 a facility 211 Although similar to 2 from a round top plate 229 and a round bottom plate 230 educated. Here is a variety of jetties 232 provided, which do not run helical, but parallel and always the same distance from each other. In each case, two adjacent webs abut either at a left rear outer edge between the plates 229 and 230 on or at another right front outer edge. So does the water in the waterway 213 a meandering path as the footbridges 232 just meandering loops form. Left front is a water inlet 216 and right behind a steam outlet 217 intended. In between, the water flows just above a radiant heater 219 in meandering loops. Otherwise, the training in terms of heating as in the 1 and 2 ,

In 4 is another institution 311 shown with a water guide 313 , The water supply 313 has an embossed top plate 329 and a flat flat bottom plate 330 on, which are interconnected. The embossing of the upper plate 329 is formed such that, as can be seen in the section, in each case approximately semicircular all-round running structures are formed, which lie directly against each other and are concentric. This results in a water supply 313 between the two plates 329 and 330 , which is formed, so to speak, of several concentric, directly adjacent rings with a semicircular cross-section.

To connect these rings for a continuous flow of water with each other, are connecting channels 333 intended. It can be seen that from the outermost ring to the second outermost ring a connecting channel 333 is provided on the left and the next connection channel 333 between the second outermost and the third outermost ring directly opposite. This means that the water at a water inlet 316 right outside and a steam outlet 317 flows in the middle of the outermost ring in two directions, so to speak, left around and right around, and then on the connection channel 333 flow into the second outermost ring in the left front. There it is again distributed left and right around and then flows over another connecting channel 333 right back in the third outermost ring. So the water continues to flow until it finally releases the steam 317 reached in the middle.

The alternately opposite arrangement of the individual connection channels 333 does not have to be, but is considered beneficial. These connection channels can also be advantageous by embossing the upper plate 329 getting produced. Even if the water supply in 4 is not spirally formed in the classical sense, so it is but in their effect or function through the connecting channels.

In a further embodiment of the invention, it is possible, the lower plate 330 not flat and level, but almost corresponding or in mirror image to the upper plate 329 with imprints. Then the individual rings would be the water guide 313 not semicircular, but essentially full circle. Here it can also be provided that the two plates are identical and are then placed on each other and connected to each other. water inlet 316 and steam outlet 317 are then retrofitted pipe sections or the like., On the water 313 or be attached to corresponding holes, for example by welding or soldering.

In 5 is represented as a device 11 similar 1 with a water guide 13 in a closed housing 28 can be arranged. Here are a lower radiant heater 19a and an upper radiant heater 19b provided, each in turn similar 1 can be trained. So you are on Dämmkörpern 22 attached, which have a thermal insulation effect to the outside. Outside are again Dämmränder 25a and 25b provided only by a water inlet 16 and a steam outlet 17 to be interrupted. The housing may for example consist of sheet metal, similar to the above-described carrier shell 24 ,

This creates a heat-insulating closed housing, which in its interior the water supply 13 including the radiant heaters 19a and 19b having. Outwardly, it has a water inlet 16 and a steam outlet 17 on. Through the radiant heaters 19a and 19b on both sides of the water supply 13 can be done here in a very high heat input in water in the water supply. Due to the insulating properties of the insulating body 22a and 22b as well as the Dämmränder 25a and 25b escapes very little heat to the outside, so that the efficiency is very good. Furthermore, there is only a small heat load of the environment in which the device 11 arranged or mounted for steam generation.

In 6 Finally, another embodiment of the invention is shown, in which case a device 411 a water guide 413 comprising, from a spiral spiral wound pipe 414 consists. Unlike the previously described embodiments of 1 to 5 is the water supply 413 So not flat or even, but elongated. It has a water inlet 416 and a steam outlet 417 on. The water supply 413 is in a housing 428 arranged, which consists of four plate-like Dämmkörpern 422 consists. These surround the water supply 413 completely, advantageously also at the two open ends, which have been left open for the sake of clarity. Here is shown how on three insides of the insulating body 422 radiant heating 419 with conductor strips 420 are arranged. This is also for the fourth side or the inside of the lower insulating body 422 possible, but not so planned here.

So while at the facility 311 according to 5 almost the entire outer surface of the water supply 313 is exposed to heat radiation, this applies to the device 411 according to 6 only for the outward facing surface of the water supply 413 , On the entire inside is the water supply 413 without heating, so to speak on about half of the outer surface. According to one possibility could here another, rod-like and elongated heating element in the interior of the water supply 413 be provided. Advantageously, it works without a heating element, and the three external radiant heaters 419 are then just designed for a sufficient heat output.

In the arrangement according to 5 is easy to imagine, like one of the two radiant heaters 19a or 19b can be saved and here only a corresponding insulating body 22 is provided, which can then be made thinner and, of course, closer to the water supply 13 can lie. This reduces the size. On the other hand, just a part of the heating power, which falls on the second side of the water supply 13 can act. Furthermore, the size here is not quite half as large as in the two-sided heating, but can for example be reduced to about three quarters to two thirds, although the heating power is just half as large.

The advantage with a device 11 for example according to 1 is the use of simple and known as well as inexpensive individual assemblies, in particular from the tube 14 curved water flow 13 as well as the radiant heating 19 , The radiant heating 19 For example, it may be a radiant heater known from the prior art mentioned above, as used for heating under glass-ceramic cooktops. Alternatively, at least one corresponding Heizleitererband is used, which is inserted into a specially made insulating body or attached thereto.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102009010989 A1 [0002]
• US 7593625 B2 [0003]
• EP 585831A [0020]

Claims (12)

Means for heating water or steam, in particular for generating steam having a temperature of more than 100 ° C, wherein the device has a tortuous or curved or spiral water guide with a water inlet and a steam outlet, wherein at least one heating element provided as a radiant heater is, characterized in that the heating element is arranged outside the water guide or surrounds the water supply, wherein the heating element has a distance from the water guide or a wall of the water guide. Device according to claim 1, characterized in that the water guide is flat overall or extends in a plane. Device according to claim 2, characterized in that at least one heating element is formed flat with a heating element surface which is not or only slightly smaller than a surface occupied by the water guide. Device according to claim 2 or 3, characterized in that two similar heating elements are arranged on both sides of the flat or running in a plane water guide. Device according to one of the preceding claims, characterized in that the at least one radiant heater has a radiation characteristic substantially in one direction, preferably as a surface radiation, wherein in particular in the opposite direction at the back of the radiant heater, a heat insulation and / or reflector arrangements are provided. Device according to one of the preceding claims, characterized in that it comprises a housing which is substantially closed except for water inlet and steam outlet, in particular with thermal insulation on the insides. Device according to one of the preceding claims, characterized in that the water guide is formed like a tube or channel and is formed or wound from a tube having a plurality of spiral turns or meandering loops, wherein preferably the turns or loops have a small distance from each other or abut each other. Device according to one of claims 1 to 6, characterized in that the water guide consists of two parallel arranged surface elements or plates, are inserted between the webs, which connect the plates and form the spiral turns or meandering loops of water flow. Device according to one of claims 1 to 6, characterized in that the water guide is formed by at least one in the form of spiral turns or meandering loops embossed plate-shaped component, which is placed on this component a mirror image corresponding component or a substantially flat plate for a closed water flow, in particular a patch flat plate facing the Strahlungsheizelement out. Device according to one of claims 1 to 6, characterized in that the water guide is formed from a helically wound pipe in helix shape and is irradiated or heated by at least one arranged outside the interior of the water guide Strahlungsheizelement, preferably at least two, preferably three , Sides outside the water guide Radiant heating elements are arranged. Device according to one of the preceding claims, characterized in that to improve the coupling of the radiant heating in the water flow, a surface of the water supply to the heating element is specially coated or structured, preferably as a dark color or roughening. Device according to one of the preceding claims, characterized in that a radiant heating element has a fixed to an insulating or support material heat conductor of wire-like material, wherein the heating conductor runs in a spirally wound or meandering loop-like shape, wherein preferably the heating conductor is an upright Flachheizleiterband, the partially embedded in the carrier material.

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