EP0429953A2 - Air cooled condenser for a clothes dryer - Google Patents

Air cooled condenser for a clothes dryer Download PDF

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Publication number
EP0429953A2
EP0429953A2 EP19900121783 EP90121783A EP0429953A2 EP 0429953 A2 EP0429953 A2 EP 0429953A2 EP 19900121783 EP19900121783 EP 19900121783 EP 90121783 A EP90121783 A EP 90121783A EP 0429953 A2 EP0429953 A2 EP 0429953A2
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EP
European Patent Office
Prior art keywords
frame
plates
cooling air
capacitor according
foils
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.)
Granted
Application number
EP19900121783
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German (de)
French (fr)
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EP0429953B1 (en
EP0429953A3 (en
Inventor
Günter Dr. Wentzlaff
Stefan Dipl.-Ing. Morath
Klaus Dipl.-Ing. Grunert (Fh)
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BSH Hausgeraete GmbH
Original Assignee
Bosch Siemens Hausgerate GmbH
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Publication of EP0429953A3 publication Critical patent/EP0429953A3/en
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0025—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being formed by zig-zag bend plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F28F21/065—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing plate-like or laminated conduits

Definitions

  • the invention relates to an air-cooled condenser for condensing the laundry moisture transferred into the process air from a household tumble dryer, the condenser containing hollow plates stacked at a distance from one another and during operation, on the one hand, through the plate cavities of cooling air and, on the other hand, through the plates -Distance spaces essentially in cross flow to the cooling air through which process air flows.
  • Such a capacitor is known from German utility model 83 18 395.
  • the heat exchanger of this condenser contains stacked plates, which are bent according to DE-OS 30 27 900 from aluminum sheet and are provided with ribbing in the cooling air duct. Instead of such plates, usually flat hollow extruded profiles are used, of which sections are joined to form a plate according to the above-mentioned embodiments.
  • the stacked panels are molded into a package and held at a distance from each other by plastic molded parts attached to the side and glued with sealing compound.
  • these plates are very expensive in terms of the material used fes (aluminum) and in terms of their manufacture.
  • the assembly of the plates and their sealing attachment in the separate side parts is very complex and prone to errors in terms of the tightness between the cooling air and the process air channel.
  • the invention has for its object to provide a construction for a capacitor mentioned in the introduction, in which the sealing problems mentioned above are avoided and the manufacture of the capacitor, in particular the assembly of its individual parts into a package, is suitable for fully automated production.
  • the plates are essentially made of a hollow lattice-like plastic frame with the condensation surfaces forming plastic films, which sealingly abut on all surfaces separating a connection between cavities and spaces.
  • Such a construction enables the automatic production of the plates from molded plastic parts and the automatic placement of plastic films and their connection to the frame.
  • the individual plates can also be automatically stacked and connected to one another in a suitable manner.
  • the frames in the cavity have a plurality of partition walls aligned in the flow direction of the cooling air, the height of which is equal to the frame thickness and the surfaces facing the condensation surface serve as support surfaces for the foils.
  • the foils should lie sealingly on the support surfaces. This prevents the foils from fluttering in the channels when the current is strong and thereby lifting off from the support surfaces.
  • the foils of each plate can consist of one piece which is placed around a frame edge oriented in the flow direction of the cooling air. This shape simplifies production in that the films are pulled off a roll, placed on an outer frame edge, folded over on the opposite frame edge, returned as a condensation surface to the first frame edge and can be cut off there.
  • embodiments of the invention are suitable in which the foils are welded or glued to its material at the contact surfaces to the frame or in which the foils are extrusion-coated with its material on the contact surfaces to the frame are.
  • the frame moldings comprise the side cheeks surrounding the inflow and outflow openings of the cooling air, which are connected in one piece to the spacer strips which determine the distance to the top or bottom plate and extend over the entire width of the cooling air cavities.
  • the spacer strips integrated into the frame molding reduce the number of individual parts required for a capacitor according to the invention. Furthermore, the number of sealing surfaces can be reduced.
  • the stacked plates are sealingly connected to one another at the contact surfaces between the one longitudinal edge of the side cheeks and the free longitudinal edge of the spacer strips. Such a connection results in a compact plate stack as a package.
  • the sealing connection can also consist of an adhesive or a weld.
  • the invention can advantageously be further developed in that the plastic films are pre-stretched before being connected to the plastic frame.
  • pre-stretched films are commercially available and are always used where a firm position of the films is required after heat treatment. This use has the essential advantage in the condenser according to the invention that after the heat treatment shrinked films no longer contain any risk of wrinkling, which would lead to the accumulation of condensate during operation of the tumble dryer and reduce the heat transfer.
  • a capacitor according to the invention can best be handled in practice in that the stacked plates form a block, the top and bottom of which are covered by a plastic cover plate at a distance from the next stacked plate. As a result, the plastic foils sensitive condensation surfaces.
  • the entire package of stacked plates and plastic cover plates can be held together by at least two tensioning straps wrapping around the package.
  • tensioning straps are known for example as parcel straps, have a high tension and can be attached automatically. Special sealing measures on the contact surfaces of the stacked plates and plastic cover plates would be unnecessary.
  • the tumble dryer shown as an exemplary embodiment in FIG. 1 has a housing 10 with an internal drying space 11. Between this and the rear wall of the dryer there is a supply air duct 12 in which the air is heated by means of a heating device 13 and by a fan 14 via a grille wall 15 is blown into the drying room At the front of the dryer there is a loading opening 16 for loading the laundry parts to be dried. The loading opening is then closed by a door 17.
  • the Pro arrives from there zeßluft in the air-cooled condenser 2.
  • the condenser is shown partially broken and contains heat-conducting plates 21 with cavities which are traversed by fresh cooling air across the process air.
  • the process air is shown on the warm side by a solid arrow and on the cold side by a dashed, streaked arrow.
  • the moisture collects at the outlet of the condenser and flows off to the condensate collecting container 22, from which the condensate can be pumped out or removed manually.
  • a door or flap 23 which can be opened by the operator for the purpose of cleaning the condenser 2. Before cleaning, the plates 21 can be pulled out of the condenser 2 as a package and cleaned outside.
  • the plates 21 contain a uniform plastic molding.
  • This molded part is formed from two side walls 24, which together with end strips 25 form the support frame for the film 26 shown in FIG. 3.
  • the side walls 24 contain inflow openings 27 and outflow openings 28 for the cooling air.
  • partition walls 29 are also provided which run parallel to the end strips 25 and are essentially aligned in the flow direction of the cooling air and are as high as the entire frame is thick. These dividing walls 29 can deviate from the planar shape in a manner not shown here regularly or irregularly in order to swirl the cooling air flowing through the cooling air channels delimited by them. As a result, the cooling air comes into closer contact with the condensation surfaces formed by the film.
  • the plastic frames 24, 25 with their partitions 29 form the cavities for the cooling air.
  • the process air sweeps across the cooling air over the condensation surfaces formed by the drawn-on plastic film 26.
  • the plates each form spacing spaces which are maintained by spacer strips 30 on the undersides of the cheeks 24.
  • spacer strips sit on the respective upper edge of the side cheek 24 of the plate below. Between the spacer strips 30 arranged on both sides on the one hand and the underside of the upper plate and the upper side of the lower plate on the other hand, a space is formed which guides the process air.
  • the film 26 can, as shown in Fig. 3, consist of one piece and folded around a face bar 25 so that it lies with its imaginary line network 31 on the respective contact surfaces of the plastic molding (Fig. 2).
  • the longitudinal lines 32 lie on the upper or lower long narrow sides 33 of the side walls 24 and the transverse lines 34 of the line network 31 on the support surfaces 35 of the partition walls 29.
  • the materials of the film and the frame can be welded or glued to one another at these contact surfaces.
  • Another fastening option is also that the film material is at least partially extrusion-coated by the material of the frame along the contact surfaces. This would mean inserting the foils into the injection mold in the manufacturing process for such a plate before the plastic frame is injection molded. 3, the plastic films can also be present separately for each condensation surface.
  • Plates produced in this way can be stacked in accordance with the exemplary embodiment in FIG. 2.
  • the number of stacked plates in one package can be varied; For use in household tumble dryers, a number of nine plates stacked one on top of the other has proven to be sufficient, starting from a base area available for the condenser.
  • Such a package of stacked plates can become a uniformly manageable part by sealingly connecting the individual plates to one another at their surfaces in contact with one another - in the present example these are the lower longitudinal strips of the spacer strips 30 and the upper longitudinal strips of the side walls 24.
  • Such a sealing connection can consist of an adhesive or a weld.
  • the contact areas can also be through mechanical pressure of the plates become tight.
  • an additional application of a sealing compound is recommended because the seal between the cooling air and the process air channels should be as ideal as possible.
  • Such a mechanical connection can be achieved by clamping the side panels and spacer strips stacked one above the other.
  • a plastic cover plate is advantageously provided at a distance from the next stacked plate on its top and on its underside, such a plate pack could be used for the mechanical connection of the plates to one another by at least two Package wrapping straps to be held together.
  • the distance of the additional plastic cover plate on the top should then be maintained by means of separate spacer strips.
  • the plastic films attached to the frame can advantageously be pre-stretched according to an embodiment of the invention before they are processed. Since such plastic frames are subject to unwanted deformations after their injection molding process (warping, shrinkage, thermal expansion), folds could form in the film glued to the frame, in which condensate collects, which hinders the transition from the process air to the cooling air. Such a pre-stretched, so-called shrink film would avoid this effect because it tensions itself automatically when the capacitor is put into operation for the first time. This measure ensures that the film is taut and wrinkle-free in any correct operating mode, from which the condensate can flow freely.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

Der Kondensator enthält einen Stapel von Wärmetauscher-Platten, die mit Abstand zueinander gestapelt sind und an zwei einander gegenüberliegenden Seiten offene Hohlräume haben. Die Hohlräume werden während des Betriebs von Kühlluft durchströmt, während die Abstandsräume im wesentlichen im Kreuzstrom zur Kühlluft von Prozeßluft durchströmt werden.The condenser contains a stack of heat exchanger plates which are stacked at a distance from one another and have open cavities on two opposite sides. Cooling air flows through the cavities during operation, while process air flows through the spacing spaces essentially in cross flow to the cooling air.

Zur Vereinfachung der Konstruktion eines solchen Kondensators und davon abhängig zur Vermeidung von Dichtungsproblemen und der Eignung für eine vollautomatische Fertigung sind die Platten im wesentlichen aus einem hohlgitterartigen Kunststoff-Rahmen (24, 25, 29) mit die Kondensationsflächen bildenden Kunststoff-Folien (26) gestaltet, die an allen eine Verbindung zwischen Hohlräumen und Abstandsräumen trennenden Flächen (33, 35) des Rahmens dichtend anliegen.

Figure imga0001
In order to simplify the construction of such a capacitor and, depending on it, to avoid sealing problems and its suitability for fully automated production, the plates are essentially made of a hollow-lattice-like plastic frame (24, 25, 29) with plastic foils (26) forming the condensation surfaces , which bear sealingly on all surfaces (33, 35) of the frame that separate a connection between cavities and spacing spaces.
Figure imga0001

Description

Die Erfindung geht aus von einem luftgekühlten Kondensator zum Kondensieren der in die Prozeßluft übertragenen Wäschefeuchtigkeit aus einem Haushalt-Wäschetrockner, wobei der Kondensator mit Abstand zueinander gestapelte, hohle Platten enthält und während des Betriebs einerseits durch die Platten-Hohlräume von Kühlluft und andererseits durch die Platten-Abstandsräume im wesentlichen im Kreuzstrom zur Kühlluft von Prozeßluft durchströmt wird.The invention relates to an air-cooled condenser for condensing the laundry moisture transferred into the process air from a household tumble dryer, the condenser containing hollow plates stacked at a distance from one another and during operation, on the one hand, through the plate cavities of cooling air and, on the other hand, through the plates -Distance spaces essentially in cross flow to the cooling air through which process air flows.

Ein derartiger Kondensator ist aus dem deutschen Gebrauchsmuster 83 18 395 bekannt. Der Wärmetauscher dieses Kondensators enthält als Paket gestapelte Platten, die gemäß der DE-OS 30 27 900 aus Alublech gebogen und mit einer Verrippung im Kühlluftkanal versehen sind. Anstelle solcher Platten werden üblicherweise auch flache Hohlraum-Strangpreßprofile verwendet, von denen Abschnitte zu einer Platte gemäß vorstehend genannter Ausführungsformen zusammengefügt werden. Die gestapelten Platten werden durch seitlich angesetzte und mit Dichtmasse verklebte Kunststoff-Formteile zu einem Paket geformt auf Abstand zueinander gehalten. Einerseits sind diese Platten jedoch sehr teuer hinsichtlich des verwendeten Werkstof fes (Aluminium) und hinsichtlich ihrer Herstellung. Andererseits ist aber auch die Montage der Platten und ihre dichtende Befestigung in den gesonderten Seitenteilen sehr aufwendig und fehleranfällig in bezug auf die Dichtheit zwischen dem Kühlluft- und dem Prozeßluft-Kanal.Such a capacitor is known from German utility model 83 18 395. The heat exchanger of this condenser contains stacked plates, which are bent according to DE-OS 30 27 900 from aluminum sheet and are provided with ribbing in the cooling air duct. Instead of such plates, usually flat hollow extruded profiles are used, of which sections are joined to form a plate according to the above-mentioned embodiments. The stacked panels are molded into a package and held at a distance from each other by plastic molded parts attached to the side and glued with sealing compound. On the one hand, however, these plates are very expensive in terms of the material used fes (aluminum) and in terms of their manufacture. On the other hand, the assembly of the plates and their sealing attachment in the separate side parts is very complex and prone to errors in terms of the tightness between the cooling air and the process air channel.

Der Erfindung liegt die Aufgabe zugrunde, eine Konstruktion für einen eingangs genannten Kondensator anzugeben, bei der die vorstehend genannten Dichtungsprobleme vermieden werden und die Herstellung des Kondensators, insb. die Montage seiner Einzelteile zu einem Paket, für eine vollautomatische Fertigung geeignet ist.The invention has for its object to provide a construction for a capacitor mentioned in the introduction, in which the sealing problems mentioned above are avoided and the manufacture of the capacitor, in particular the assembly of its individual parts into a package, is suitable for fully automated production.

Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß die Platten im wesentlichen aus je einem hohlgitterartigen Kunststoff-Rahmen mit die Kondensationsflächen bildenden Kunststoff-Folien gestaltet sind, die an allen eine Verbindung zwischen Hohlräumen und Abstandsräumen trennenden Flächen des Rahmens dichtend anliegen. Eine derartige Konstruktion ermöglicht eine automatische Herstellung der Platten aus Kunststoff-Spritzteilen und das automatische Auflegen von Kunststoff-Folien und deren Verbindung zu den Rahmen. Die einzelnen Platten können ferner automatisch gestapelt und auf geeignete Weise miteinander verbunden werden.According to the invention, this object is achieved in that the plates are essentially made of a hollow lattice-like plastic frame with the condensation surfaces forming plastic films, which sealingly abut on all surfaces separating a connection between cavities and spaces. Such a construction enables the automatic production of the plates from molded plastic parts and the automatic placement of plastic films and their connection to the frame. The individual plates can also be automatically stacked and connected to one another in a suitable manner.

In vorteilhafter Ausgestaltung der Erfindung weisen die Rahmen im Hohlraum mehrere in Strömungsrichtung der Kühlluft ausgerichtete Trennwände auf, deren Höhe gleich der Rahmendicke ist und deren zur Kondensationsfläche gewandte Flächen als Stützflächen für die Folien dienen. Hierdurch erhalten die Kunststoff-Folien genügend Auflageflächen, so daß die Gefahr einer Wellung oder Faltung der Folien weitgehend vermieden werden muß. Die Folien sollten gemäß Ausführungsform der Erfindung an den Stützflächen dichtend anliegen. Hierdurch wird vermieden, daß bei starker Strömung in den Kanälen die Folien flattern und sich dabei von den Stützflächen abheben.In an advantageous embodiment of the invention, the frames in the cavity have a plurality of partition walls aligned in the flow direction of the cooling air, the height of which is equal to the frame thickness and the surfaces facing the condensation surface serve as support surfaces for the foils. This gives the plastic films enough contact surfaces so that the risk of curling or folding of the films must be largely avoided. According to the embodiment of the invention, the foils should lie sealingly on the support surfaces. This prevents the foils from fluttering in the channels when the current is strong and thereby lifting off from the support surfaces.

In besonders vorteilhafter Weise können die Folien jeder Platte aus einem Stück bestehen, das um eine in Strömungsrichtung der Kühlluft orientierte Rahmenkante gelegt ist. Diese Form vereinfacht die Fertigung dahingehend, daß die Folien von einer Rolle abgezogen, an einem äußeren Rahmenrand angelegt, am gegenüberliegenden Rahmenrand umgeschlagen, als Kondensationsfläche zum ersten Rahmenrand zurückgeführt und dort abgeschnitten werden können.In a particularly advantageous manner, the foils of each plate can consist of one piece which is placed around a frame edge oriented in the flow direction of the cooling air. This shape simplifies production in that the films are pulled off a roll, placed on an outer frame edge, folded over on the opposite frame edge, returned as a condensation surface to the first frame edge and can be cut off there.

Je nach der gewählten Paarung von Kunststoffen für den Rahmen und für die Folien eignen sich Ausführungsformen der Erfindung, bei denen die Folien an den Kontaktflächen zum Rahmen mit seinem Werkstoff verschweißt oder verklebt sind oder bei dem die Folien an den Kontaktflächen zum Rahmen von seinem Werkstoff umspritzt sind.Depending on the selected pairing of plastics for the frame and for the foils, embodiments of the invention are suitable in which the foils are welded or glued to its material at the contact surfaces to the frame or in which the foils are extrusion-coated with its material on the contact surfaces to the frame are.

Vorteilhafterweise umfassen die Rahmenspritzlinge die Ein- und Ausströmöffnungen der Kühlluft umschließende Seitenwangen, die einstückig mit den Abstand zur Ober- oder Unterplatte bestimmenden und sich über die gesamte Breite der Kühlluft-Hohlräume erstreckenden Abstandsleisten verbunden sind. Die in die Rahmenspritzlinge integrierten Abstandsleisten vermindern die Zahl der für einen erfindungsgemäßen Kondensator erforderlichen Einzelteile. Ferner kann dadurch die Zahl der Dichtflächen verringert werden. Hierzu ist es von besonderem Vorteil, daß die gestapelten Platten an den Kontaktflächen zwischen der einen Längskante der Seitenwangen und der freien Längskante der Abstandsleisten dichtend miteinander verbunden sind. Eine solche Verbindung ergibt einen kompakten Plattenstapel als Paket.Advantageously, the frame moldings comprise the side cheeks surrounding the inflow and outflow openings of the cooling air, which are connected in one piece to the spacer strips which determine the distance to the top or bottom plate and extend over the entire width of the cooling air cavities. The spacer strips integrated into the frame molding reduce the number of individual parts required for a capacitor according to the invention. Furthermore, the number of sealing surfaces can be reduced. For this purpose, it is particularly advantageous that the stacked plates are sealingly connected to one another at the contact surfaces between the one longitudinal edge of the side cheeks and the free longitudinal edge of the spacer strips. Such a connection results in a compact plate stack as a package.

Ebenfalls je nach verwendetem Kunststoff kann die dichtende Verbindung aus einer Klebung oder einer Schweißung bestehen.Depending on the plastic used, the sealing connection can also consist of an adhesive or a weld.

In besonderer Weise kann die Erfindung mit Vorteil dadurch weitergebildet werden, daß die Kunststoff-Folien vor dem Verbinden mit dem Kunststoff-Rahmen vorgereckt sind. Derartige vorgereckte Folien (Schrumpffolien) sind handelsüblich und werden immer dort eingesetzt, wo nach einer Wärmebehandlung eine straffe Lage der Folien erforderlich ist. Diese Verwendung hat bei dem erfindungsgemäßen Kondensator den wesentlichen Vorteil, daß nach der Wärmebehandlung geschrumpfte Folien keine Gefahr für Faltenbildung mehr enthalten, die während des Betriebs des Wäschetrockners zum Aufsammeln von Kondensat führen und den Wärmeübergang vermindern würde.In a special way, the invention can advantageously be further developed in that the plastic films are pre-stretched before being connected to the plastic frame. Such pre-stretched films (shrink films) are commercially available and are always used where a firm position of the films is required after heat treatment. This use has the essential advantage in the condenser according to the invention that after the heat treatment shrinked films no longer contain any risk of wrinkling, which would lead to the accumulation of condensate during operation of the tumble dryer and reduce the heat transfer.

Ein erfindungsgemäßer Kondensator kann in der Praxis am besten dadurch handhabbar werden, daß die gestapelten Platten einen Block bilden, dessen Oberseite und Unterseite durch je eine Kunststoff-Deckplatte mit Abstand zur nächsten gestapelten Platte abgedeckt ist. Hierdurch werden die aus Kunststoff-Folien gebildeten, empfindlichen Kondensationsflächen geschützt.A capacitor according to the invention can best be handled in practice in that the stacked plates form a block, the top and bottom of which are covered by a plastic cover plate at a distance from the next stacked plate. As a result, the plastic foils sensitive condensation surfaces.

In besonders vorteilhafter Weise kann das gesamte Paket aus gestapelten Platten und Kunststoff-Deckplatten durch wenigstens zwei das Paket umschlingende Spannbänder zusammengehalten sein. Solche Spannbänder sind beispielsweise als Paketbänder bekannt, haben eine hohe Spannung und sind automatisch anbringbar. Besondere Dichtungsmaßnahmen an den Kontaktflächen der übereinandergestapelten Platten und Kunststoff-Deckplatten würden sich dadurch erübrigen.In a particularly advantageous manner, the entire package of stacked plates and plastic cover plates can be held together by at least two tensioning straps wrapping around the package. Such straps are known for example as parcel straps, have a high tension and can be attached automatically. Special sealing measures on the contact surfaces of the stacked plates and plastic cover plates would be unnecessary.

Anhand des in der Zeichnung dargestellten Ausführungsbeispieles ist die Erfindung nachstehend erläutert. Es zeigen:

Fig. 1
einen Haushalt-Wäschetrockner in schematischer Seiten-Durchsicht mit einem luftgekühlten Kondensator,
Fig. 2
zwei übereinandergestapelte Kunststoff-Rahmen-Spritzlinge für die Wärmetauscher-Platten und
Fig. 3
eine entsprechend der Form eines Rahmens gefaltete Kunststoff-Folie für die Kondensationsflächen.
The invention is explained below using the exemplary embodiment shown in the drawing. Show it:
Fig. 1
a household clothes dryer in a schematic side view with an air-cooled condenser,
Fig. 2
two stacked plastic frame moldings for the heat exchanger plates and
Fig. 3
a plastic film folded according to the shape of a frame for the condensation surfaces.

Der als Ausführungsbeispiel gezeigte Wäschetrockner in Fig. 1 hat ein Gehäuse 10 mit einem innenliegenden Trockenraum 11. Zwischen diesem und der Rückwand des Trockners befindet sich ein Zuluftkanal 12, in dem die Luft mittels einer Heizeinrichtung 13 erwärmt und von einem Gebläse 14 über eine Gitterwand 15 in den Trockenraum geblasen wird An der Vorderseite des Wäschetrockners befindet sich eine Beschickungsöffnung 16 zum Einladen der zu trocknenden Wäscheteile. Danach wird die Beschickungsöffnung von einer Tür 17 verschlossen.The tumble dryer shown as an exemplary embodiment in FIG. 1 has a housing 10 with an internal drying space 11. Between this and the rear wall of the dryer there is a supply air duct 12 in which the air is heated by means of a heating device 13 and by a fan 14 via a grille wall 15 is blown into the drying room At the front of the dryer there is a loading opening 16 for loading the laundry parts to be dried. The loading opening is then closed by a door 17.

Die vom Gebläse 14 durch den Trockenraum 11 und den Ringspalt zwischen der Tür und dem äußeren Rahmen der Beschickungsöffnung 16 geblasene Prozeßluft tritt durch das Flusensieb 18 in den Abluftkanal 19 ein. Von dort gelangt die Pro zeßluft in den luftgekühlten Kondensator 2. Der Kondensator ist teilweise gebrochen dargestellt und enthält gut wärmeleitende Platten 21 mit Hohlräumen, die quer zur Prozeßluft von frischer Kühlluft durchsetzt werden. Die Prozeßluft ist auf der warmen Seite durch einen ausgfüllten Pfeil und auf der kalten Seite durch einen gestrichelten, längsgestreiften Pfeil dargestellt. Die warme und feuchtigkeitsbeladene Prozeßluft gibt an den Oberflächen der Platten 21 Wärme und Feuchtigkeit ab und fließt gekühlt dem Gebläse 14 zu. Die Feuchtigkeit sammelt sich am Ausgang des Kondensators und fließt zum Kondensat-Sammelbehälter 22 ab, aus dem das Kondensat abgepumpt oder manuell entfernt werden kann.The process air blown by the blower 14 through the drying chamber 11 and the annular gap between the door and the outer frame of the loading opening 16 enters the exhaust air duct 19 through the fluff filter 18. The Pro arrives from there zeßluft in the air-cooled condenser 2. The condenser is shown partially broken and contains heat-conducting plates 21 with cavities which are traversed by fresh cooling air across the process air. The process air is shown on the warm side by a solid arrow and on the cold side by a dashed, streaked arrow. The warm and moisture-laden process air releases heat and moisture from the surfaces of the plates 21 and flows to the blower 14 in a cooled state. The moisture collects at the outlet of the condenser and flows off to the condensate collecting container 22, from which the condensate can be pumped out or removed manually.

An der Vorderseite des Wäschetrockner-Gehäuses 10 befindet sich außerdem eine Tür oder Klappe 23, die von der Bedienungsperson zum Zwecke der Reinigung des Kondensators 2 geöffnet werden kann. Vor der Reinigung können die Platten 21 als Paket aus dem Kondensator 2 gezogen und außerhalb gereinigt werden.At the front of the dryer housing 10 there is also a door or flap 23 which can be opened by the operator for the purpose of cleaning the condenser 2. Before cleaning, the plates 21 can be pulled out of the condenser 2 as a package and cleaned outside.

Die Platten 21 enthalten gemäß dem in Fig. 2 dargestellten Ausführungsbeispiel einen einheitlichen Kunststoff-Spritzling. Dieser Spritzling ist aus zwei Seitenwangen 24 gebildet, die zusammen mit Stirnleisten 25 den Stützrahmen für die in Fig. 3 dargestellte Folie 26 bilden. Dabei enthalten die Seitenwangen 24 Einströmöffnungen 27 und Ausströmöffnungen 28 für die Kühlluft. Zur Stützung der Kondensationsfläche der beiderseits auf den Stützrahmen aufgezogenen Folie 26 sind ferner noch parallel zu den Stirnleisten 25 verlaufende Trennwände 29 vorgesehen, die im wesentlichen in Strömungsrichtung der Kühlluft ausgerichtet und so hoch sind, wie der gesamte Rahmen dick ist. Diese Trennwände 29 können in hier nicht dargestellter Weise regelmäßig oder unregelmäßig von der ebenflächigen Form abweichen, um die durch die von ihnen begrenzten Kühlluftkanäle strömende Kühlluft zu verwirbeln. Dadurch gelangt die Kühlluft in innigeren Kontakt zu den von der Folie gebildeten Kondensationsflächen.According to the exemplary embodiment shown in FIG. 2, the plates 21 contain a uniform plastic molding. This molded part is formed from two side walls 24, which together with end strips 25 form the support frame for the film 26 shown in FIG. 3. The side walls 24 contain inflow openings 27 and outflow openings 28 for the cooling air. To support the condensation surface of the film 26 drawn onto the support frame on both sides, partition walls 29 are also provided which run parallel to the end strips 25 and are essentially aligned in the flow direction of the cooling air and are as high as the entire frame is thick. These dividing walls 29 can deviate from the planar shape in a manner not shown here regularly or irregularly in order to swirl the cooling air flowing through the cooling air channels delimited by them. As a result, the cooling air comes into closer contact with the condensation surfaces formed by the film.

Wie zuvor erläutert wurde, bilden also die Kunststoff-Rahmen 24, 25 mit ihren Trennwänden 29 die Hohlräume für die Kühlluft. Die Prozeßluft streicht dagegen quer zur Kühlluft über die von der aufgezogenen Kunststoff-Folie 26 gebildeten Kondensationsflächen Dazu bilden die Platten untereinander jeweils Abstandsräume, die durch Abstandsleisten 30 an den Unterseiten der Wangen 24 eingehalten werden.As previously explained, the plastic frames 24, 25 with their partitions 29 form the cavities for the cooling air. The process air, on the other hand, sweeps across the cooling air over the condensation surfaces formed by the drawn-on plastic film 26. For this purpose, the plates each form spacing spaces which are maintained by spacer strips 30 on the undersides of the cheeks 24.

Diese Abstandsleisten sitzen auf der jeweiligen Oberkante der Seitenwange 24 der darunterliegenden Platte. Zwischen den beiderseitig angeordneten Abstandsleisten 30 einerseits und der Unterseite der oberen Platte sowie der Oberseite der unteren Platte andererseits bildet sich dadurch ein Abstandsraum aus, der die Prozeßluft führt.These spacer strips sit on the respective upper edge of the side cheek 24 of the plate below. Between the spacer strips 30 arranged on both sides on the one hand and the underside of the upper plate and the upper side of the lower plate on the other hand, a space is formed which guides the process air.

Die Folie 26 kann, wie in Fig. 3 dargestellt, aus einem Stück bestehen und um eine Stirnleiste 25 so gefaltet sein, daß sie mit ihrem gedachten Liniennetz 31 auf den jeweiligen Kontaktflächen des Kunststoff-Spritzlings (Fig. 2) anliegt. Dabei liegen die Längslinien 32 auf den oberen oder unteren langen Schmalseiten 33 der Seitenwangen 24 und die Querlinien 34 des Liniennetzes 31 auf den Stützflächen 35 der Trennwände 29. An diesen Kontaktflächen können die Werkstoffe der Folie und des Rahmens miteinander verschweißt oder verklebt sein. Eine weitere Befestigungsmöglichkeit besteht aber auch darin, daß der Folienwerkstoff vom Werkstoff des Rahmens entlang der Kontaktflächen wenigstens teilweise umspritzt ist. Dies würde bedeuten, im Herstellungsprozeß für eine derartige Platte die Folien in das Spritzwerkzeug einzulegen, bevor der Kunststoff-Rahmen gespritzt ist. Abweichend vom Beispiel der Fig. 3 können die Kunststoff-Folien aber auch getrennt für jede Kondensationsfläche vorliegen.The film 26 can, as shown in Fig. 3, consist of one piece and folded around a face bar 25 so that it lies with its imaginary line network 31 on the respective contact surfaces of the plastic molding (Fig. 2). The longitudinal lines 32 lie on the upper or lower long narrow sides 33 of the side walls 24 and the transverse lines 34 of the line network 31 on the support surfaces 35 of the partition walls 29. The materials of the film and the frame can be welded or glued to one another at these contact surfaces. Another fastening option is also that the film material is at least partially extrusion-coated by the material of the frame along the contact surfaces. This would mean inserting the foils into the injection mold in the manufacturing process for such a plate before the plastic frame is injection molded. 3, the plastic films can also be present separately for each condensation surface.

Solchermaßen hergestellte Platten können entsprechend dem Ausführungsbeispiel in Fig. 2 gestapelt werden. Die Anzahl der gestapelten Platten in einem Paket ist variierbar; für die Anwendung bei Haushalt-Wäschetrocknern hat sich - ausgehend von einer für den Kondensator zur Verfügung stehenden Grundfläche - eine Anzahl von neun übereinander gestapelten Platten als ausreichend erwiesen.Plates produced in this way can be stacked in accordance with the exemplary embodiment in FIG. 2. The number of stacked plates in one package can be varied; For use in household tumble dryers, a number of nine plates stacked one on top of the other has proven to be sufficient, starting from a base area available for the condenser.

Ein solches Paket aus gestapelten Platten kann zu einem einheitlich handhabbaren Teil werden, indem die einzelnen Platten an ihren miteinander in Berührung stehenden Flächen - das sind beim vorliegenden Beispiel die unteren Längsstreifen der Abstandsleisten 30 und die oberen Längsstreifen der Seitenwangen 24 - dichtend miteinander verbunden werden. Eine solche dichtende Verbindung kann aus einer Klebung oder einer Schweißung bestehen. Die Kontaktflächen können jedoch auch durch mechanische Pressung der Platten dicht werden. Eine zusätzliche Anwendung einer Dichtmasse empfiehlt sich jedoch trotzdem, weil die Abdichtung zwischen den Kühlluft-und den Prozeßluftkanälen möglichst ideal sein soll. Eine solche mechanische Verbindung läßt sich durch Einspannen der übereinander gestapelten Seitenwangen und Abstandsleisten erzielen. Da zum mechanischen Schutz der obersten und der untersten Folien eines gefügten Plattenpakets an seiner Oberseite und an seiner Unterseite vorteilhafterweise je eine Kunststoff-Deckplatte mit Abstand zur nächsten gestapelten Platte vorgesehen ist, könnte ein solches Plattenpaket für die mechanische Verbindung der Platten untereinander durch wenigstens zwei das Paket umschlingende Spannbänder zusammengehalten sein. Der Abstand der zusätzlichen Kunststoff-Deckplatte an der Oberseite sollte dann durch eigene Abstandsleisten eingehalten werden. An der Unterseite des Plattenpakets ist ohnehin auf jeder Seite eine Abstandsleiste 30 vorhanden, auf deren freier Schmalseite die untere Kunststoff-Deckplatte aufliegen kann.Such a package of stacked plates can become a uniformly manageable part by sealingly connecting the individual plates to one another at their surfaces in contact with one another - in the present example these are the lower longitudinal strips of the spacer strips 30 and the upper longitudinal strips of the side walls 24. Such a sealing connection can consist of an adhesive or a weld. However, the contact areas can also be through mechanical pressure of the plates become tight. However, an additional application of a sealing compound is recommended because the seal between the cooling air and the process air channels should be as ideal as possible. Such a mechanical connection can be achieved by clamping the side panels and spacer strips stacked one above the other. Since for the mechanical protection of the top and bottom foils of a joined plate pack, a plastic cover plate is advantageously provided at a distance from the next stacked plate on its top and on its underside, such a plate pack could be used for the mechanical connection of the plates to one another by at least two Package wrapping straps to be held together. The distance of the additional plastic cover plate on the top should then be maintained by means of separate spacer strips. On the underside of the plate pack there is a spacer strip 30 on each side anyway, on the free narrow side of which the lower plastic cover plate can rest.

Die auf den Rahmen befestigten Kunststoff-Folien können vorteilhafterweise gemäß einem Ausführungsbeispiel der Erfindung vor ihrer Verarbeitung vorgereckt sein. Da nämlich solche Kunststoff-Rahmen nach ihrem Spritzprozeß ungewollten Verformungen unterliegen (Verzug, Schwinden, Wärmedehnung), könnten in der mit dem Rahmen verklebten Folie Falten entstehen, in denen sich Kondensat sammelt, das den Übergang von der Prozeßluft zur Kühlluft behindert. Eine solche vorgereckte, sogenannte Schrumpffolie würde diesen Effekt vermeiden, weil sie sich bei der ersten Inbetriebnahme des Kondensators durch die eingebrachte Wärme selbsttätig spannt. Diese Maßnahme gewährleistet eine bei jeder ordnungsgemäßen Betriebsart straffe und faltenfrei Folie, von der das Kondensat ungehindert abfließen kann.The plastic films attached to the frame can advantageously be pre-stretched according to an embodiment of the invention before they are processed. Since such plastic frames are subject to unwanted deformations after their injection molding process (warping, shrinkage, thermal expansion), folds could form in the film glued to the frame, in which condensate collects, which hinders the transition from the process air to the cooling air. Such a pre-stretched, so-called shrink film would avoid this effect because it tensions itself automatically when the capacitor is put into operation for the first time. This measure ensures that the film is taut and wrinkle-free in any correct operating mode, from which the condensate can flow freely.

Claims (14)

Luftgekühlter Kondensator zum Kondensieren der in die Prozeßluft übertragenen Wäschefeuchtigkeit aus einem Haushalt-Wäschestrockner, wobei der Kondensator mit Abstand zueinander gestapelte, hohle Platten enthält und während des Betriebs einerseits durch die Platten-Hohlräume von Kühlluft und andererseits durch die Platten-Abstandsräume im wesentlichen im Kreuzstrom zur Kühlluft von Prozeßluft durchströmt wird, dadurch gekennzeichnet, daß die Platten im wesentlichen aus je einem hohlgitterartigen Kunststoff-Rahmen (24, 25, 29) mit die Kondensationsflächen bildenden Kunststoff-Folien (26) gestaltet sind, die an allen eine Verbindung zwischen Hohlräumen und Abstandsräumen trennenden Flächen (33, 35) des Rahmens dichtend anliegen.Air-cooled condenser for condensing the laundry moisture transferred into the process air from a household tumble dryer, the condenser containing hollow plates stacked at a distance from one another and during operation, on the one hand, through the plate cavities of cooling air and, on the other hand, through the plate spacing spaces essentially in cross flow is flowed through to the cooling air of process air, characterized in that the plates are essentially made of a hollow lattice-like plastic frame (24, 25, 29) with the condensation surfaces forming plastic films (26), which connect all cavities and Surfaces separating spaces (33, 35) of the frame fit tightly. Kondensator nach Anspruch 1, dadurch gekennzeichnet, daß die Rahmen (24, 25, 29) im Hohlraum mehrere in Strömungsrichtung der Kühlluft ausgerichtete Trennwände (29) aufweisen, deren Höhe gleich der Rahmendicke ist und deren zur Kondensationsfläche gewandte Flächen (35) als Stützflächen für die Folien (26) dienen.Condenser according to Claim 1, characterized in that the frames (24, 25, 29) in the cavity have a plurality of partition walls (29) oriented in the flow direction of the cooling air, the height of which is equal to the frame thickness and their surfaces (35) facing the condensation surface as support surfaces for the foils (26) serve. Kondensator nach Anspruch 2, dadurch gekennzeichnet, daß die Folien (26) an den Stützflächen (33, 35) dichtend anliegen.Capacitor according to claim 2, characterized in that the foils (26) lie sealingly on the support surfaces (33, 35). Kondensator nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Folien (26) jeder Platte aus einem Stück bestehen, das um eine in Strömungsrichtung der Kühlluft orientierte Rahmenkante (25) gelegt ist.Condenser according to one of the preceding claims, characterized in that the foils (26) of each plate consist of one piece which is placed around a frame edge (25) oriented in the flow direction of the cooling air. Kondensator nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Folien (26) an den Kontaktflächen (33, 35) zum Rahmen (24, 25, 29) mit seinem Werkstoff verschweißt sind.Capacitor according to one of the preceding claims, characterized in that the foils (26) on the contact surfaces (33, 35) to the frame (24, 25, 29) are welded to its material. Kondensator nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Folien (26) an den Kontaktflächen (33, 35) zum Rahmen (24, 25, 29) mit seinem Werkstoff verklebt sind.Capacitor according to one of claims 1 to 4, characterized in that the foils (26) on the contact surfaces (33, 35) to the frame (24, 25, 29) are glued to its material. Kondensator nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Folien (26) an den Kontaktflächen (33, 35) zum Rahmen (24, 25, 29) von seinem Werkstoff umspritzt sind.Capacitor according to one of claims 1 to 4, characterized in that the foils (26) on the contact surfaces (33, 35) to the frame (24, 25, 29) are extrusion-coated from its material. Kondensator nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Rahmen (24, 25, 29) die Ein- und Ausströmöffnungen (27, 28) der Kühlluft umschließende Seitenwangen (24) umfassen, die einstückig mit den Abstand zur Ober- oder Unterplatte bestimmenden und sich über die gesamte Breite der Kühlluft-Hohlräume erstreckenden Abstandsleisten (30) verbunden sind.Condenser according to one of the preceding claims, characterized in that the frames (24, 25, 29) comprise the side cheeks (24) which surround the inlet and outlet openings (27, 28) of the cooling air and which determine the distance from the top or bottom plate in one piece and spacer strips (30) extending over the entire width of the cooling air cavities are connected. Kondensator nach Anspruch 8, dadurch gekennzeichnet, daß die gestapelten Platten (Fig. 2) an den Kontaktflächen zwischen der einen Längskante der Seitenwangen (24) und der freien Längskante der Abstandsleisten (30) dichtend miteinander verbunden sind.Capacitor according to Claim 8, characterized in that the stacked plates (Fig. 2) are sealingly connected to one another at the contact surfaces between the one longitudinal edge of the side cheeks (24) and the free longitudinal edge of the spacer strips (30). Kondensator nach Anspruch 9, dadurch gekennzeichnet, daß die dichtende Verbindung aus einer Klebung besteht.Capacitor according to claim 9, characterized in that the sealing connection consists of an adhesive. Kondensator nach Anspruch 9, dadurch gekennzeichnet, daß die dichtende Verbindung aus einer Schweißung besteht.Capacitor according to claim 9, characterized in that the sealing connection consists of a weld. Kondensator nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Kunststoff-Folien (26) vor dem Verbinden mit dem Kunststoff-Rahmen (24, 25, 29) vorgereckt sind.Capacitor according to one of the preceding claims, characterized in that the plastic films (26) are pre-stretched before being connected to the plastic frame (24, 25, 29). Kondensator nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, daß die gestapelten Platten (Fig. 2) einen Block bilden, dessen Oberseite und Unterseite durch je eine Kunststoff-Deckplatte mit Abstand zur nächsten gestapelten Platte abgedeckt ist.Capacitor according to one of claims 9 to 11, characterized in that the stacked plates (Fig. 2) form a block, the top and bottom of which are covered by a plastic cover plate at a distance from the next stacked plate. Kodensator nach Anspruch 13, dadurch gekennzeichnet, daß das gesamte Paket aus gestapelten Platten und Kunststoff-Deckplatten durch wenigstens zwei das Paket umschlingende Spannbänder zusammengehalten ist.Coding device according to claim 13, characterized in that the entire package of stacked plates and plastic cover plates is held together by at least two tensioning straps wrapping around the package.
EP90121783A 1989-12-01 1990-11-14 Air cooled condenser for a clothes dryer Expired - Lifetime EP0429953B1 (en)

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DE3939855A DE3939855A1 (en) 1989-12-01 1989-12-01 AIR COOLED CONDENSER FOR A HOUSEHOLD LAUNDRY DRYER
DE3939855 1989-12-01

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EP0429953A2 true EP0429953A2 (en) 1991-06-05
EP0429953A3 EP0429953A3 (en) 1991-09-25
EP0429953B1 EP0429953B1 (en) 1996-01-17

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EP0982427A1 (en) * 1998-08-25 2000-03-01 Joma-Polytec Kunststofftechnik GmbH Cross flow heat exchanger for laundry drier with condenser
EP1203923A2 (en) 2000-11-01 2002-05-08 AKG-Thermotechnik GmbH & Co.KG Heat exchanger, in particular condensation laundry drier
WO2004040220A1 (en) * 2002-10-31 2004-05-13 Oxycell Holding B.V. A method for manufacturing a heat exchanger, and heat exchanger obtained with that method
EP1518957A1 (en) * 2003-09-24 2005-03-30 Lg Electronics Inc. Condensing-type dryer
EP1550764A1 (en) * 2003-12-26 2005-07-06 Lg Electronics Inc. Dryer, and drain structure of the same
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US20110167665A1 (en) * 2010-01-13 2011-07-14 Peet Shoe Dryer, Inc. Reservoir bladder dryer system
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CN104911882B (en) * 2014-03-14 2018-10-30 青岛海尔滚筒洗衣机有限公司 A kind of dryer or washing-drying integral machine
CN104911877B (en) * 2014-03-14 2018-12-25 青岛海尔滚筒洗衣机有限公司 A heat exchanger with a frame
CN104911881B (en) * 2014-03-14 2019-01-22 青岛海尔滚筒洗衣机有限公司 an air condensing structure
WO2015197423A1 (en) * 2014-06-24 2015-12-30 BSH Hausgeräte GmbH Heat exchanger for a domestic appliance, method for producing same, and domestic appliance comprising same

Also Published As

Publication number Publication date
EP0429953B1 (en) 1996-01-17
EP0429953A3 (en) 1991-09-25
DE59010071D1 (en) 1996-02-29
DE3939855A1 (en) 1991-06-06

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