EP1342828A2 - Laundry drier - Google Patents

Laundry drier Download PDF

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Publication number
EP1342828A2
EP1342828A2 EP03002961A EP03002961A EP1342828A2 EP 1342828 A2 EP1342828 A2 EP 1342828A2 EP 03002961 A EP03002961 A EP 03002961A EP 03002961 A EP03002961 A EP 03002961A EP 1342828 A2 EP1342828 A2 EP 1342828A2
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EP
European Patent Office
Prior art keywords
heat exchanger
clothes dryer
fan
dryer according
warm
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Granted
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EP03002961A
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German (de)
French (fr)
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EP1342828A3 (en
EP1342828B1 (en
Inventor
Theodor Blum
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Individual
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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 
    • 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 
    • D06F58/206—Heat pump arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/51—Presence
    • B65H2511/512—Marks, e.g. invisible to the human eye; Patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/40—Movement
    • B65H2513/42—Route, path

Definitions

  • the invention relates to a clothes dryer according to the preamble of claim 1.
  • Such a tumble dryer is known from DE 199 04 993 A1.
  • the blowers for the hot air and the cold air are operated in different directions of rotation.
  • an overall reduced drying time of the laundry in the drum results in an energy-reduced drying process.
  • the drying process is still not optimized.
  • a clothes dryer is also known from DE 69 26 182 U, in which a Peltier element is provided.
  • the Peltier element is arranged with both its cold side and its warm side in the same air line.
  • a laundry dryer is also known from JP Patent Abstracts of Japan 08057194 A, in which in turn a Peltier element is arranged in the same air flow both with its cold side and with its warm side.
  • the object of the invention is thus seen in improving the drying process in a tumble dryer of the type mentioned at the outset.
  • a clothes dryer with the features of the preamble of claim 1 is designed in accordance with the characterizing part of this claim.
  • the warm side of at least one Peltier element is provided as the heating device and is arranged in the warm air flow.
  • the cold side of the Peltier element is arranged in a closed stream of cold air. This leads to a very cheap one Energy balance for the drying process, since both the hot side and the cold side of the Peltier element are used.
  • the cooled cold air flow results in an increased condensation of the warm air in the heat exchanger, so that a quick dehumidification of the laundry in the drum is ensured.
  • several Peltier elements thermally connected in series are arranged in the form of a Peltier cascade instead of a Peltier element.
  • the tumble dryer Since the cold air circuit and the warm air circuit are closed, the tumble dryer is completely closed to the outside, so that the room climate at the installation site is not affected or only very slightly influenced by a slight rise in temperature. In particular, there is no increase in air humidity.
  • the heat exchanger is advantageously a countercurrent heat exchanger.
  • a cross-flow heat exchanger was used in the generic tumble dryer.
  • the countercurrent heat exchanger used in the tumble dryer according to the invention is characterized in that a temperature exchange of the two air streams takes place over the entire longitudinal sectional area of this heat exchanger.
  • a further embodiment of the invention provides that at least one spacer element is arranged between the cold side and the warm side of the at least one Peltier element to increase the distance between the cooler surfaces on the cold side and the warm side. This results in a better power balance, since the hot side and the cold side are thermally decoupled.
  • a further embodiment of the invention provides that the fan in the warm air circuit is a radial fan with a first fan wheel.
  • the same fan is expediently also used in the cold air circuit, a second fan wheel being provided for this purpose.
  • Both Fan wheels of the radial fan are arranged on the same axis and driven by a single drive motor.
  • a vacuum pump is provided.
  • the vacuum pump is located inside the dryer and reduces the air pressure inside the dryer by approximately 0.2 bar. This leads to an increase in the efficiency of the drying process, since the evaporation temperature is lowered by the use of the vacuum pump, so that a very low drying temperature is thereby made possible.
  • the clothes dryer 1 has a closed warm air circuit 2 and a closed cold air circuit 3.
  • a first fan wheel 5 of a blower 6, a warm side 7 of a Peltier cascade 8 with Peltier elements as a heating device, a rotatably mounted drum 9 for receiving the laundry to be dried, a fluff filter 10 and a heat exchanger 11 are arranged in the flow direction 4.
  • a second fan wheel 13 of the fan 6, a cold side 14 of the Peltier cascade 8 for cooling the cold air and the heat exchanger 11 are arranged in the flow direction 12.
  • a container 15 for receiving the condensed water is provided below the heat exchanger 11.
  • the fan 6 is a radial fan, the first fan wheel 5 and the second fan wheel 13 are arranged on the same axis and are driven by a single drive motor.
  • the warm side 7 of the Peltier cascade 8 is designed as a multi-part air cooler.
  • the cold side 14 of the Peltier cascade 8 is designed as a one-piece air cooler.
  • the Peltier cascade 8 has a total of 3 double Peltier elements 16, which are arranged thermally in series.
  • a spacer element 17 is provided between each double Peltier element 16 so that the warm side 7 and the cold side 14 are at a greater distance from one another and are therefore thermally decoupled.
  • insulating elements 18 are provided between the hot side 7 and the cold side 14.
  • the spacer elements 17 have a high thermal conductivity in order to enable effective heat transfer from the Peltier elements 16 to the warm side 7.
  • the spacer elements 17 are made of copper. However, other materials with high thermal conductivity are also conceivable.
  • the thickness of the Peltier elements is 4 mm and the thickness of each spacer element 17 is at least 10 mm.
  • the heat exchanger 11 is a counterflow heat exchanger.
  • the countercurrent heat exchanger has individual profile plates 19 arranged one above the other, each profile plate 19 having a hexagonal shape overall.
  • the profile plates 19 for the warm air and the profile plates 19 for the cold air lie alternately one above the other, the profile plates 19 for the cold air and the profile plates 19 for the warm air being rotated relative to one another in the plane of the plate by 180 °.
  • a separating layer is arranged between each profile plate 19.
  • Each profile plate 19 has a wave-shaped profile and consists of a first triangular shape 20, a second triangular shape 21 and a rectangular shape 22. On the opposite sides of the rectangular shape 22, as seen in the longitudinal direction of the profile plate 19, there is in each case a triangular shape 20, 21.
  • Each triangular shape 20, 21 is manufactured in such a way that each profile channel 23 of triangular shape 20 and each profile channel 24 of triangular shape 21 exactly adjoins two profile channels 25 of rectangular shape 22. This precise determination of the widths of the profile channels and is achieved in that each triangular shape is cut or punched out of a material such that the ratio of hypotenuse to height is 3.5 to 1 for each triangular shape.
  • the triangular shapes are identical.
  • the Profile channels 23, 24 of the triangular shapes 20, 21 run obliquely, in particular at an angle of approximately 60 °, to the longitudinal direction, while the profile channels 25 of the rectangular shape 22 run parallel to the longitudinal direction.
  • FIG. 2 shows schematically the arrangement of the Peltier cascade 8, the heat exchanger 11, the drum 9, the container 15 for the condensed water and a motor 27 for the drum 9 within the clothes dryer 1 according to the invention Peltier cascade 8. Furthermore, an operating bar 26 is provided on the front of the clothes dryer 1 for the operation of the clothes dryer 1.
  • a vacuum pump 28 is provided, which is arranged within the clothes dryer 1.
  • the air pressure within the tumble dryer 1 is reduced by approximately 0.2 bar, which increases the efficiency of the drying process, since the evaporation temperature is reduced by using the vacuum pump 28.
  • the heat exchanger 11 in FIG. 3 is only drawn out for better illustration of the air flow and is actually arranged in the clothes dryer 1.
  • the warm air flows through the drum 9 with the moist laundry in a closed circuit, then the fluff filter 10 and then the heat exchanger 11 and further the fan wheel 5 on the warm side and the warm side 7 of the Peltier cascade 8, which is designed as an air cooler, on the warm side.
  • the cold air flows in a closed circuit from the outlet of the cold side 14 designed as an air cooler through the heat exchanger 11, back to the fan wheel 13 on the cold side and again through the cold side 14.
  • the laundry can be dried at a low drying temperature and is therefore particularly gentle. Since the circuits for warm air and cold air are completely closed, the room climate at the installation site is only very slightly influenced by the drying process due to a slight increase in temperature. There is no increase in air humidity and no fluff.
  • the counterflow heat exchanger 11 enables a large temperature difference despite the low temperature. Furthermore, the tumble dryer is very quiet due to the closed arrangement.

Abstract

A washer-drier has a closed warm air circuit (2) in which a fan (6), a heating device (8), a drum (9) for the accommodation of the washing and a heat exchanger (11) with condensed water container (15) are arranged in sequence and a fan for the generation of a cold air stream (3) over the heat exchanger for the dehumidifying of the warm air. The heating device is a warm side (7) of at least one Peltier element and a cold side (14) of the Peltier element(s) is arranged in the cold air stream. A closed cold air circuit is provided. The heat exchanger is a contra-flow heat exchanger.

Description

Die Erfindung bezieht sich auf einen Wäschetrockner gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a clothes dryer according to the preamble of claim 1.

Ein derartiger Wäschetrockner ist durch die DE 199 04 993 A1 bekannt. Bei diesem Wäschetrockner werden die Gebläse für die Warmluft und die Kaltluft in unterschiedlichen Drehrichtungen betrieben. In Verbindung mit einer besonderen Ausbildung der Gebläseräder ergibt sich auf Grund einer insgesamt verkürzten Trocknungszeit der Wäsche in der Trommel ein energiereduzierter Trocknungsprozeß. Nachteiligerweise ist jedoch der Trocknungsprozeß immer noch nicht optimiert.Such a tumble dryer is known from DE 199 04 993 A1. With this tumble dryer, the blowers for the hot air and the cold air are operated in different directions of rotation. In conjunction with a special design of the fan wheels, an overall reduced drying time of the laundry in the drum results in an energy-reduced drying process. Unfortunately, the drying process is still not optimized.

Durch die DE 69 26 182 U ist ebenfalls ein Wäschetrockner bekannt, bei welchem ein Peltierelement vorgesehen ist. Das Peltierelement ist sowohl mit seiner Kaltseite als auch mit seiner Warmseite in derselben Luftleitung angeordnet. Durch die JP Patent Abstracts of Japan 08057194 A ist ebenfalls ein Wäschetrockner bekannt, bei welchem wiederum ein Peltierelement sowohl mit seiner Kaltseite als auch mit seiner Warmseite in demselben Luftstrom angeordnet ist.A clothes dryer is also known from DE 69 26 182 U, in which a Peltier element is provided. The Peltier element is arranged with both its cold side and its warm side in the same air line. A laundry dryer is also known from JP Patent Abstracts of Japan 08057194 A, in which in turn a Peltier element is arranged in the same air flow both with its cold side and with its warm side.

Die Aufgabe der Erfindung wird somit darin gesehen, bei einem Wäschetrockner der eingangs genannten Art den Trocknungsprozeß zu verbessern.The object of the invention is thus seen in improving the drying process in a tumble dryer of the type mentioned at the outset.

Zur Lösung dieser Aufgabe wird erfindungsgemäß vorgeschlagen, daß ein Wäschetrockner mit den Merkmalen des Oberbegriffs des Anspruchs 1 entsprechend dem kennzeichnenden Teil dieses Anspruchs ausgebildet ist.To achieve this object, it is proposed according to the invention that a clothes dryer with the features of the preamble of claim 1 is designed in accordance with the characterizing part of this claim.

Bei dem erfindungsgemäßen Wäschetrockner ist als Heizeinrichtung die Warmseite mindestens eines Peltierelementes vorgesehen, welche im Warmluftstrom angeordnet ist. Gleichzeitig ist die Kaltseite des Peltierelementes in einem geschlossenen Kaltluftstrom angeordnet. Dies führt zu einer sehr günstigen Energiebilanz für den Trocknungsprozeß, da sowohl die Warmseite als auch die Kaltseite des Peltierelementes genutzt wird. Durch den gekühlten Kaltluftstrom ergibt sich im Wärmetauscher eine erhöhte Kondensation der Warmluft, so daß eine schnelle Entfeuchtung der Wäsche in der Trommel gewährleistet ist. Für eine Leistungssteigerung des Wäschetrockners sind anstelle eines Peltierelementes mehrere thermisch in Reihe geschaltete Peltierelemente in Form einer Peltier-Kaskade angeordnet.In the tumble dryer according to the invention, the warm side of at least one Peltier element is provided as the heating device and is arranged in the warm air flow. At the same time, the cold side of the Peltier element is arranged in a closed stream of cold air. This leads to a very cheap one Energy balance for the drying process, since both the hot side and the cold side of the Peltier element are used. The cooled cold air flow results in an increased condensation of the warm air in the heat exchanger, so that a quick dehumidification of the laundry in the drum is ensured. To increase the performance of the tumble dryer, several Peltier elements thermally connected in series are arranged in the form of a Peltier cascade instead of a Peltier element.

Da der Kaltluftkreislauf und auch der Warmluftkreislauf geschlossen sind, ist der Wäschetrockner nach außen vollkommen geschlossen, so daß das Raumklima am Aufstellungsort durch den Trocknungsvorgang nicht oder nur sehr gering durch einen leichten Temperaturanstieg beeinflußt wird. Es tritt insbesondere keine Erhöhung der Luftfeuchtigkeit auf.Since the cold air circuit and the warm air circuit are closed, the tumble dryer is completely closed to the outside, so that the room climate at the installation site is not affected or only very slightly influenced by a slight rise in temperature. In particular, there is no increase in air humidity.

Um einen besonders effektiven Wärmetauscher zu gestalten, ist vorteilhafterweise der Wärmetauscher ein Gegenstromwärmetauscher. Bei dem gattungsbildenden Wäschetrockner wurde ein Kreuzstromwärmetauscher verwendet. Der bei dem erfindungsgemäßen Wäschetrockner verwendete Gegenstromwärmetauscher zeichnet sich dadurch aus, daß über die gesamte Längsschnittfläche dieses Wärmetauschers ein Temperaturaustausch der beiden Luftströme stattfindet.In order to design a particularly effective heat exchanger, the heat exchanger is advantageously a countercurrent heat exchanger. A cross-flow heat exchanger was used in the generic tumble dryer. The countercurrent heat exchanger used in the tumble dryer according to the invention is characterized in that a temperature exchange of the two air streams takes place over the entire longitudinal sectional area of this heat exchanger.

Eine weitere Ausgestaltung der Erfindung sieht vor, daß zwischen der Kaltseite und der Warmseite des mindestens einen Peltierelementes zur Vergrößerung des Abstandes der Kühlerflächen an der Kaltseite von der Warmseite mindestens ein Distanzelement angeordnet ist. Hierdurch wird eine bessere Leistungsbilanz erzielt, da die Warmseite und die Kaltseite thermisch entkoppelt sind.A further embodiment of the invention provides that at least one spacer element is arranged between the cold side and the warm side of the at least one Peltier element to increase the distance between the cooler surfaces on the cold side and the warm side. This results in a better power balance, since the hot side and the cold side are thermally decoupled.

Um den Wäschetrockner kompakt zu bauen, sieht eine weitere Ausbildung der Erfindung vor, daß das Gebläse im Warmluftkreislauf ein Radialventilator mit einem ersten Lüfterrad ist. Zweckmäßigerweise wird dasselbe Gebläse auch im Kaltluftkreislauf verwendet, wobei hierfür ein zweites Lüfterrad vorgesehen ist. Beide Lüfterräder des Radialventilators sind auf derselben Achse angeordnet und von einem einzigen Antriebsmotor angetrieben.In order to make the clothes dryer compact, a further embodiment of the invention provides that the fan in the warm air circuit is a radial fan with a first fan wheel. The same fan is expediently also used in the cold air circuit, a second fan wheel being provided for this purpose. Both Fan wheels of the radial fan are arranged on the same axis and driven by a single drive motor.

Bei einer weiteren Ausführungsform der Erfindung ist eine Vakuumpumpe vorgesehen. Die Vakuumpumpe ist innerhalb des Trockners angeordnet und reduziert den Luftdruck innerhalb des Trockners um etwa 0,2 bar. Dies führt zu einer Erhöhung der Effizienz des Trocknungsvorganges, da die Verdampfungstemperatur durch den Einsatz der Vakuumpumpe abgesenkt wird, so daß hierdurch eine sehr niedrige Trocknungstemperatur ermöglicht wird.In a further embodiment of the invention, a vacuum pump is provided. The vacuum pump is located inside the dryer and reduces the air pressure inside the dryer by approximately 0.2 bar. This leads to an increase in the efficiency of the drying process, since the evaporation temperature is lowered by the use of the vacuum pump, so that a very low drying temperature is thereby made possible.

Die Erfindung wird nachstehend anhand der Zeichnung näher erläutert. Die Zeichnung zeigt ein Ausführungsbeispiel der Erfindung. Hierbei stellen dar:

  • Fig. 1 eine schematische Darstellung der Kreisläufe in dem erfindungsgemäßen Wäschetrockner,
  • Fig. 2 eine schematische Vorderansicht und
  • Fig. 3 eine schematische Darstellung der Kreisläufe bei einer weiteren Ausführungsform der Erfindung.
The invention is explained below with reference to the drawing. The drawing shows an embodiment of the invention. Here represent:
  • 1 is a schematic representation of the circuits in the tumble dryer according to the invention,
  • Fig. 2 is a schematic front view and
  • Fig. 3 is a schematic representation of the circuits in a further embodiment of the invention.

Der erfindungsgemäße Wäschetrockner 1 weist einen geschlossenen Warmluftkreislauf 2 und einen geschlossen Kaltluftkreislauf 3 auf. In dem Warmluftkreislauf 2 sind in Strömungsrichtung 4 nachfolgend ein erstes Lüfterrad 5 eines Gebläses 6, eine Warmseite 7 einer Peltierkaskade 8 mit Peltierelementen als Heizeinrichtung, eine drehbar gelagerte Trommel 9 zur Aufnahme der zu trocknenden Wäsche, ein Flusensieb 10 und ein Wärmetauscher 11 angeordnet. In dem Kaltluftkreislauf 3 sind in Strömungsrichtung 12 nachfolgend ein zweites Lüfterrad 13 des Gebläses 6, eine Kaltseite 14 der Peltierkaskade 8 zur Kühlung der Kaltluft und der Wärmetauscher 11 angeordnet. Unterhalb des Wärmetauschers 11 ist ein Behältnis 15 zur Aufnahme des Kondenswassers vorgesehen. Das Gebläse 6 ist ein Radialventilator, wobei das erste Lüfterrad 5 und das zweite Lüfterrad 13 auf derselben Achse angeordnet sind und von einem einzigen Antriebsmotor angetrieben werden. Die Warmseite 7 der Peltierkaskade 8 ist als mehrteiliger Luftkühler ausgebildet. Die Kaltseite 14 der Peltierkaskade 8 ist als einteiliger Luftkühler ausgebildet. Die Peltierkaskade 8 weist insgesamt 3 Doppelpeltierelemente 16 auf, welche thermisch in Reihe angeordnet sind. Zwischen jedem Doppelpeltierelement 16 ist ein Distanzelement 17 vorgesehen, damit die Warmseite 7 und die Kaltseite 14 einen größeren Abstand voneinander haben und somit thermisch entkoppelt sind. Zusätzlich sind zwischen der Warmseite 7 und der Kaltseite 14 Isolierelemente 18 vorgesehen. Die Distanzelemente 17 besitzen eine hohe Wärmeleitfähigkeit, um einen wirkungsvollen Wärmeübertrag von den Peltierelementen 16 auf die Warmseite 7 zu ermöglichen. Die Distanzelemente 17 bestehen aus Kupfer. Es sind jedoch auch andere Werkstoffe mit hoher Wärmeleitfähigkeit denkbar. Die Dicke der Peltierelemente beträgt 4 mm und die Dicke jedes Distanzelementes 17 beträgt mindestens 10 mm.The clothes dryer 1 according to the invention has a closed warm air circuit 2 and a closed cold air circuit 3. In the warm air circuit 2, a first fan wheel 5 of a blower 6, a warm side 7 of a Peltier cascade 8 with Peltier elements as a heating device, a rotatably mounted drum 9 for receiving the laundry to be dried, a fluff filter 10 and a heat exchanger 11 are arranged in the flow direction 4. In the cold air circuit 3, a second fan wheel 13 of the fan 6, a cold side 14 of the Peltier cascade 8 for cooling the cold air and the heat exchanger 11 are arranged in the flow direction 12. A container 15 for receiving the condensed water is provided below the heat exchanger 11. The fan 6 is a radial fan, the first fan wheel 5 and the second fan wheel 13 are arranged on the same axis and are driven by a single drive motor. The warm side 7 of the Peltier cascade 8 is designed as a multi-part air cooler. The cold side 14 of the Peltier cascade 8 is designed as a one-piece air cooler. The Peltier cascade 8 has a total of 3 double Peltier elements 16, which are arranged thermally in series. A spacer element 17 is provided between each double Peltier element 16 so that the warm side 7 and the cold side 14 are at a greater distance from one another and are therefore thermally decoupled. In addition, insulating elements 18 are provided between the hot side 7 and the cold side 14. The spacer elements 17 have a high thermal conductivity in order to enable effective heat transfer from the Peltier elements 16 to the warm side 7. The spacer elements 17 are made of copper. However, other materials with high thermal conductivity are also conceivable. The thickness of the Peltier elements is 4 mm and the thickness of each spacer element 17 is at least 10 mm.

Bei dem Wärmetauscher 11 handelt es sich um einen Gegenstromwärmetauscher. Der Gegenstromwärmetauscher weist einzelne, übereinander angeordnete Profilplatten 19 auf, wobei jede Profilplatte 19 insgesamt sechseckförmig ausgebildet ist. Die Profilplatten 19 für die Warmluft und die Profilplatten 19 für die Kaltluft liegen abwechselnd übereinander, wobei die Profilplatten 19 für die Kaltluft und die Profilplatten 19 für die Warmluft in Plattenebene um 180° gegeneinander gedreht sind. Zwischen jeder Profilplatte 19 ist eine Trennschicht angeordnet. Jede Profilplatte 19 weist ein wellenförmiges Profil auf und besteht aus einer ersten Dreieckform 20, einer zweiten Dreieckform 21 und einer Rechteckform 22. An, in Längsrichtung der Profilplatte 19 gesehen, gegenüberliegenden Seiten der Rechteckform 22 schließt sich jeweils eine Dreieckform 20, 21 an. Jede Dreieckform 20, 21 ist so hergestellt, daß sich jeder Profilkanal 23 der Dreieckform 20 und jeder Profilkanal 24 der Dreieckform 21 an zwei Profilkanäle 25 der Rechteckform 22 exakt anschließt. Diese genaue Bestimmung der Breiten der Profilkanäle und wird dadurch erreicht, daß jede Dreieckform aus einem Material derart ausgeschnitten oder ausgestanzt wird, daß das Verhältnis von Hypothenuse zur Höhe bei jeder Dreieckform 3.5 zu 1 ist. Die Dreieckformen sind identisch ausgebildet. Die Profilkanäle 23,24 der Dreieckformen 20,21 verlaufen schräg, insbesondere in einem Winkel von etwa 60°, zur Längsrichtung, während die Profilkanäle 25 der Rechteckform 22 parallel zur Längsrichtung verlaufen. Bei Betrieb des Gegenstromwärmetauschers strömen die Kaltluft und die Warmluft über die gesamte Längsschnittfläche des Wärmetauschers 11 durch die Profilkanäle 23,24,25, so daß ein Wärmeaustauch auch über die gesamte Längsschnittfläche gewährleistet ist.The heat exchanger 11 is a counterflow heat exchanger. The countercurrent heat exchanger has individual profile plates 19 arranged one above the other, each profile plate 19 having a hexagonal shape overall. The profile plates 19 for the warm air and the profile plates 19 for the cold air lie alternately one above the other, the profile plates 19 for the cold air and the profile plates 19 for the warm air being rotated relative to one another in the plane of the plate by 180 °. A separating layer is arranged between each profile plate 19. Each profile plate 19 has a wave-shaped profile and consists of a first triangular shape 20, a second triangular shape 21 and a rectangular shape 22. On the opposite sides of the rectangular shape 22, as seen in the longitudinal direction of the profile plate 19, there is in each case a triangular shape 20, 21. Each triangular shape 20, 21 is manufactured in such a way that each profile channel 23 of triangular shape 20 and each profile channel 24 of triangular shape 21 exactly adjoins two profile channels 25 of rectangular shape 22. This precise determination of the widths of the profile channels and is achieved in that each triangular shape is cut or punched out of a material such that the ratio of hypotenuse to height is 3.5 to 1 for each triangular shape. The triangular shapes are identical. The Profile channels 23, 24 of the triangular shapes 20, 21 run obliquely, in particular at an angle of approximately 60 °, to the longitudinal direction, while the profile channels 25 of the rectangular shape 22 run parallel to the longitudinal direction. When the counterflow heat exchanger is in operation, the cold air and the warm air flow over the entire longitudinal sectional area of the heat exchanger 11 through the profile channels 23, 24, 25, so that heat exchange is also ensured over the entire longitudinal sectional area.

Fig.2 zeigt schematisch die Anordnung der Peltierkaskade 8, des Wärmetauschers 11, der Trommel 9, des Behältnisses 15 für das Kondenswasser und eines Motors 27 für die Trommel 9 innerhalb des erfindungsgemäßen Wäschetrockners 1. Die Anordnung des Gebläses 6 befindet sich an der Rückseite der Peltierkaskade 8. Weiterhin ist an der Vorderseite des Wäschetrockners 1 eine Bedienungsleiste 26 für den Betrieb des Wäschetrockners 1 vorgesehen.2 shows schematically the arrangement of the Peltier cascade 8, the heat exchanger 11, the drum 9, the container 15 for the condensed water and a motor 27 for the drum 9 within the clothes dryer 1 according to the invention Peltier cascade 8. Furthermore, an operating bar 26 is provided on the front of the clothes dryer 1 for the operation of the clothes dryer 1.

Bei der in Fig. 3 dargestellten weiteren Ausführungsform der Erfindung ist eine Vakuumpumpe 28 vorgesehen, welche innerhalb des Wäschetrockners 1 angeordnet ist. Mit dieser Vakuumpumpe 28 wird der Luftdruck innerhalb des Wäschetrockners 1 um etwa 0,2 bar reduziert, wodurch eine Erhöhung der Effizienz des Trocknungsvorganges erzielt wird, da die Verdampfungstemperatur durch den Einsatz der Vakuumpumpe 28 abgesenkt wird. Der Wärmetauscher 11 in Fig. 3 ist lediglich zur besseren Darstellung der Luftführung herausgezeichnet und ist real im Wäschetrockner 1 angeordnet.In the further embodiment of the invention shown in FIG. 3, a vacuum pump 28 is provided, which is arranged within the clothes dryer 1. With this vacuum pump 28, the air pressure within the tumble dryer 1 is reduced by approximately 0.2 bar, which increases the efficiency of the drying process, since the evaporation temperature is reduced by using the vacuum pump 28. The heat exchanger 11 in FIG. 3 is only drawn out for better illustration of the air flow and is actually arranged in the clothes dryer 1.

Bei Betrieb des Wäschetrockners durchströmt die Warmluft in geschlossenem Kreislauf die Trommel 9 mit der feuchten Wäsche, dann das Flusensieb 10 und danach den Wärmetauscher 11 und weiter das Lüfterrad 5 warmseitig und die als Luftkühler ausgebildete Warmseite 7 der Peltierkaskade 8 warmseitig. Die Kaltluft strömt in geschlossenem Kreislauf vom Ausgang der als Luftkühler ausgebildeten Kaltseite 14 durch den Wärmetauscher 11, zurück zum Lüfterrad 13 kaltseitig und wieder durch die Kaltseite 14.When the tumble dryer is in operation, the warm air flows through the drum 9 with the moist laundry in a closed circuit, then the fluff filter 10 and then the heat exchanger 11 and further the fan wheel 5 on the warm side and the warm side 7 of the Peltier cascade 8, which is designed as an air cooler, on the warm side. The cold air flows in a closed circuit from the outlet of the cold side 14 designed as an air cooler through the heat exchanger 11, back to the fan wheel 13 on the cold side and again through the cold side 14.

Durch die Nutzung sowohl der Warmseite 7 als auch der Kaltseite 14 der Peltierkaskade 8 wird eine sehr günstige Energiebilanz erzielt. Die Trocknung der Wäsche kann bei niederer Trocknungstemperatur durchgeführt werden und ist daher besonders schonend. Da die Kreisläufe für die Warmluft und die Kaltluft vollkommen geschlossen sind, wird das Raumklima beim Aufstellungsort durch den Trockenvorgang nur sehr gering durch einen leichten Temperaturanstieg beeinflußt. Es treten keine Erhöhung der Luftfeuchtigkeit und auch keine Flusen auf. Der Gegenstromwärmetauscher 11 ermöglicht trotz niederer Temperatur eine große Temperaturdifferenz. Weiterhin ist der Wäschetrockner durch die geschlossene Anordnung sehr leise.By using both the hot side 7 and the cold side 14 of the Peltier cascade 8, a very favorable energy balance is achieved. The laundry can be dried at a low drying temperature and is therefore particularly gentle. Since the circuits for warm air and cold air are completely closed, the room climate at the installation site is only very slightly influenced by the drying process due to a slight increase in temperature. There is no increase in air humidity and no fluff. The counterflow heat exchanger 11 enables a large temperature difference despite the low temperature. Furthermore, the tumble dryer is very quiet due to the closed arrangement.

Claims (10)

Wäschetrockner mit einem geschlossenen Warmluftkreislauf (2), in welchem ein Gebläse (6), eine Heizeinrichtung (8), eine Trommel (9) zur Aufnahme der Wäsche und ein Wärmetauscher (11) mit Kondenswasserbehälter (15) nachfolgend angeordnet sind, und mit einem Gebläse (6) zur Erzeugung eines Kaltluftstromes (3) über den Wärmetauscher (11) zum Entfeuchten der Warmluft,
dadurch gekennzeichnet,
daß die Heizeinrichtung (8) eine Warmseite (7) mindestens eines Peltierelementes ist, wobei die Warmseite (7) im geschlossenen Warmluftkreislauf (2) und eine Kaltseite (14) des mindestens einen Peltierelementes in einem geschlossenen Kaltluftkreislauf (3) angeordnet ist.Clothes dryer with a closed warm air circuit (2), in which a fan (6), a heating device (8), a drum (9) for receiving the laundry and a heat exchanger (11) with a condensate container (15) are arranged below, and with a Blower (6) for generating a cold air flow (3) via the heat exchanger (11) for dehumidifying the warm air,
characterized,
that the heating device (8) is a warm side (7) of at least one Peltier element, the warm side (7) being arranged in the closed warm air circuit (2) and a cold side (14) of the at least one Peltier element in a closed cold air circuit (3). Wäschetrockner nach Anspruch 1,
dadurch gekennzeichnet,
daß der Wärmetauscher (11) ein Gegenstromwärmetauscher ist.Clothes dryer according to claim 1,
characterized,
that the heat exchanger (11) is a counterflow heat exchanger. Wäschetrockner nach Anspruch 2,
dadurch gekennzeichnet,
daß der Gegenstromwärmetauscher einzelne, übereinander angeordnete Profilplatten (19) für einen ersten Luftstrom und einen zweiten Luftstrom aufweist, wobei jede Profilplatte (19) sechseckförmig ausgebildet ist und eine Rechteckform (22) sowie eine erste Dreieckform (20) und eine zweite Dreieckform (21) aufweisen, welche sich jeweils an eine in Längsrichtung der Profilplatte (19) gesehen gegenüberliegende Seite der Rechteckform (22) anschließen und strömungsmäßig verbindbar sind.Clothes dryer according to claim 2,
characterized,
that the counterflow heat exchanger has individual, stacked profile plates (19) for a first airflow and a second airflow, each profile plate (19) being hexagonal and having a rectangular shape (22) and a first triangular shape (20) and a second triangular shape (21) which each connect to a side of the rectangular shape (22) which is opposite in the longitudinal direction of the profile plate (19) and can be connected in terms of flow. Wäschetrockner nach Anspruch 3,
dadurch gekennzeichnet,
daß jeder Profilkanal (23) der ersten Dreieckform (20) und jeder Profilkanal (24) der zweiten Dreieckform (21) strömungsmäßig mit zwei Profilkanälen (25) der Rechteckform (22) verbindbar sind.Clothes dryer according to claim 3,
characterized,
that each profile channel (23) of the first triangular shape (20) and each profile channel (24) of the second triangular shape (21) can be connected in terms of flow to two profile channels (25) of the rectangular shape (22). Wäschetrockner nach Anspruch 3 oder 4,
dadurch gekennzeichnet,
daß bei jeder Dreieckform (20,21) das Verhältnis von Hypothenuse zu Höhe 3.5 zu 1 ist.Clothes dryer according to claim 3 or 4,
characterized,
that for every triangular shape (20,21) the ratio of hypotenuse to height is 3.5 to 1. Wäschetrockner nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß zwischen der Kaltseite (14) und der Warmseite (7) der Peltierkaskade (8) mindestens ein Distanzelement (17) angeordnet ist.Clothes dryer according to one of the preceding claims,
characterized,
that at least one spacer element (17) is arranged between the cold side (14) and the warm side (7) of the Peltier cascade (8). Wäschetrockner nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß das Gebläse (6) im Warmluftkreislauf (2) ein Radialventilator mit einem ersten Lüfterrad (5) ist.Clothes dryer according to one of the preceding claims,
characterized,
that the fan (6) in the warm air circuit (2) is a radial fan with a first fan wheel (5). Wäschetrockner nach Anspruch 7,
dadurch gekennzeichnet,
daß das Gebläse (6) im Kaltluftkreislauf (3) dasselbe Gebläse (6) wie im Warmluftkreislauf (2) ist und ein zweites Lüfterrad (13) aufweist.Clothes dryer according to claim 7,
characterized,
that the fan (6) in the cold air circuit (3) is the same fan (6) as in the warm air circuit (2) and has a second fan wheel (13). Wäschetrockner nach Anspruch 7 oder 8,
dadurch gekennzeichnet,
daß das erste Lüfterrad (5) und das zweite Lüfterrad (13) des Radialventilators auf derselben Achse angeordnet sind.Clothes dryer according to claim 7 or 8,
characterized,
that the first fan wheel (5) and the second fan wheel (13) of the radial fan are arranged on the same axis. Wäschetrockner nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß eine Vakuumpumpe (28) vorgesehen ist.Clothes dryer according to one of the preceding claims,
characterized,
that a vacuum pump (28) is provided.
EP03002961A 2002-02-21 2003-02-11 Laundry drier Expired - Lifetime EP1342828B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20202782U 2002-02-21
DE20202782U DE20202782U1 (en) 2002-02-21 2002-02-21 clothes dryer

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EP1342828A3 EP1342828A3 (en) 2004-12-01
EP1342828B1 EP1342828B1 (en) 2006-12-20

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AT (1) ATE348909T1 (en)
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DE102005057763A1 (en) * 2005-12-02 2007-06-06 BSH Bosch und Siemens Hausgeräte GmbH Thermoelectric module for domestic appliance, has opposing sides of miniature circuit boards connected to heat exchanging plate by adhesive connector
WO2007071517A1 (en) * 2005-12-15 2007-06-28 BSH Bosch und Siemens Hausgeräte GmbH Circuit arrangement for a peltier module
WO2007071536A1 (en) * 2005-12-19 2007-06-28 BSH Bosch und Siemens Hausgeräte GmbH Tumble dryer with peltier heat pump
WO2008031688A1 (en) * 2006-09-13 2008-03-20 BSH Bosch und Siemens Hausgeräte GmbH Apparatus and process for drying items of laundry, using a heat pump and a heat exchanger
WO2008052906A2 (en) * 2006-10-31 2008-05-08 BSH Bosch und Siemens Hausgeräte GmbH Method for operating a household appliance for laundry care
WO2008077838A1 (en) * 2006-12-25 2008-07-03 Arcelik Anonim Sirketi A washer/dryer
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US8356496B2 (en) 2005-12-06 2013-01-22 Bsh Bosch Und Siemens Hausgeraete Gmbh Apparatus and method for loading items to be washed with an air flow
US8365539B2 (en) 2010-02-12 2013-02-05 Massachusetts Institute Of Technology System and method for thermal process including a thermoelectric heat pump and internal heat exchanger
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DE102005057763A1 (en) * 2005-12-02 2007-06-06 BSH Bosch und Siemens Hausgeräte GmbH Thermoelectric module for domestic appliance, has opposing sides of miniature circuit boards connected to heat exchanging plate by adhesive connector
US8356496B2 (en) 2005-12-06 2013-01-22 Bsh Bosch Und Siemens Hausgeraete Gmbh Apparatus and method for loading items to be washed with an air flow
WO2007071517A1 (en) * 2005-12-15 2007-06-28 BSH Bosch und Siemens Hausgeräte GmbH Circuit arrangement for a peltier module
US9322126B2 (en) 2005-12-16 2016-04-26 Bsh Hausgeraete Gmbh Domestic appliance comprising a thermoelectric heat pump
WO2007071536A1 (en) * 2005-12-19 2007-06-28 BSH Bosch und Siemens Hausgeräte GmbH Tumble dryer with peltier heat pump
WO2008031688A1 (en) * 2006-09-13 2008-03-20 BSH Bosch und Siemens Hausgeräte GmbH Apparatus and process for drying items of laundry, using a heat pump and a heat exchanger
WO2008052906A2 (en) * 2006-10-31 2008-05-08 BSH Bosch und Siemens Hausgeräte GmbH Method for operating a household appliance for laundry care
WO2008052906A3 (en) * 2006-10-31 2008-06-19 Bsh Bosch Siemens Hausgeraete Method for operating a household appliance for laundry care
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WO2008077838A1 (en) * 2006-12-25 2008-07-03 Arcelik Anonim Sirketi A washer/dryer
US9279212B2 (en) 2006-12-25 2016-03-08 Arcelik Anonim Sirketi Washer/dryer
US8365539B2 (en) 2010-02-12 2013-02-05 Massachusetts Institute Of Technology System and method for thermal process including a thermoelectric heat pump and internal heat exchanger
WO2012089514A1 (en) * 2010-12-27 2012-07-05 Arcelik Anonim Sirketi A dishwasher comprising a thermoelectric module

Also Published As

Publication number Publication date
EP1342828A3 (en) 2004-12-01
EP1342828B1 (en) 2006-12-20
DE50306006D1 (en) 2007-02-01
DE20202782U1 (en) 2002-04-25
ATE348909T1 (en) 2007-01-15

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