EP3392396B1 - Drum dryer with room air drying function - Google Patents

Drum dryer with room air drying function Download PDF

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Publication number
EP3392396B1
EP3392396B1 EP18160230.1A EP18160230A EP3392396B1 EP 3392396 B1 EP3392396 B1 EP 3392396B1 EP 18160230 A EP18160230 A EP 18160230A EP 3392396 B1 EP3392396 B1 EP 3392396B1
Authority
EP
European Patent Office
Prior art keywords
dryer
operation mode
room air
drying chamber
air
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.)
Active
Application number
EP18160230.1A
Other languages
German (de)
French (fr)
Other versions
EP3392396A1 (en
Inventor
Matthias Etterlin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
V-Zug AG
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V-Zug AG
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Filing date
Publication date
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Priority to SI201830057T priority Critical patent/SI3392396T1/en
Publication of EP3392396A1 publication Critical patent/EP3392396A1/en
Application granted granted Critical
Publication of EP3392396B1 publication Critical patent/EP3392396B1/en
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Classifications

    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • 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 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/022—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure with provisions for changing the drying gas flow pattern, e.g. by reversing gas flow, by moving the materials or objects through subsequent compartments, at least two of which have a different direction of gas flow
    • F26B21/028—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure with provisions for changing the drying gas flow pattern, e.g. by reversing gas flow, by moving the materials or objects through subsequent compartments, at least two of which have a different direction of gas flow by air valves, movable baffles or nozzle arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D06F2103/10—Humidity expressed as capacitance or resistance
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/34—Humidity
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/32—Air flow control means
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/54—Changing between normal operation mode and special operation modes, e.g. service mode, component cleaning mode or stand-by mode
    • 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
    • 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
    • D06F60/00—Drying not provided for in groups D06F53/00 - D06F59/00

Definitions

  • the invention relates to a dryer with a drying chamber for receiving objects to be dried, a controller, and a heat pump with an evaporator, condenser, throttle and compressor.
  • the dryer further comprises a process air duct for supplying process air dried by means of the heat pump into the drying chamber and for removing process air from the drying chamber in a drying chamber operation.
  • the dryer also has an exhaust air duct for discharging process air dried by means of the heat pump into a room in which the dryer is arranged, and an air supply duct for supplying process air from the room to the heat pump in a room air drying operation.
  • tumble dryers items of clothing are placed in a drum to remove moisture from them.
  • the clothes can be stressed by the drum movements and the strong process air flow.
  • a blower arranged in the room air dryer can also be used to blow the clothes hanging in the room directly with the dry air. Compared to tumble dryers the clothes hanging in the room dry more gently but more slowly.
  • Drum tumble dryers are also known which additionally have a room air drying function.
  • EP 2 684 994 shows a clothes dryer with a drying chamber and a room air drying function.
  • the clothes dryer has a recess area in which a first adapter and a second adapter can be used. With the first adapter, recirculation mode for drying laundry in the drying chamber is guaranteed, while when using the second adapter, the room air can be dried.
  • JP 2007 319458 shows a washer dryer, which comprises a drying chamber operation and a room air drying operation.
  • a controller moves air flaps between a first and a second position to guide the air through the drum in the drying chamber mode and into the room in the room air drying mode.
  • the dryer has at least one switching means that can be controlled by the controller, the controller being designed to switch the dryer between the drying chamber mode and the room air drying mode by controlling the at least one switching device.
  • process air duct exhaust air duct and supply air duct are to be understood functionally.
  • a single duct can simultaneously function as the process air duct and the supply air duct.
  • Switching between drying chamber operation and room air drying operation using the control has the advantage that the handling of the device is more user-friendly.
  • the control can switch the operating mode based on a message from the user or based on a knife value. Switching can also be possible in the absence of the user.
  • Drying chamber operation is advantageously a recirculation mode. This means that the same process air is always dried by the heat pump and blown through the drying chamber, and no process air is released into the room.
  • the throttle can be switched at least between a first flow resistance and a second flow resistance by means of the control.
  • the controller is designed such that the throttle is at least a majority, in particular completely, in the drying chamber mode, the first flow resistance and at least a majority, in particular completely, in the room air drying mode, has the second flow resistance.
  • the throttle can have at least two switchable capillaries or can be an adjustable expansion valve.
  • An adjustable expansion valve means that the flow resistance is adjustable.
  • the choke is a switching device.
  • the dryer can be adapted to the different conditions of the process air in room air drying mode and drying chamber mode.
  • a relatively small volume of process air is available in drying chamber operation.
  • the process air which is heated up by means of the condenser and possibly by means of a further heating element and blown into the drying chamber, cools down relatively little due to the comparatively short distance to the drum outlet and therefore flows through the evaporator at a relatively high temperature.
  • the process air stays in the room air drying operation for a relatively long time, so that the process air flowing through the evaporator has room temperature and is therefore not particularly warm.
  • the different prevailing process air temperatures in the room air drying mode and in the drying chamber mode lead to a different temperature gradient on the evaporator or to changing heat flows and thus influence the operation of the heat pump.
  • the intention is to completely evaporate the refrigerant using the heat supplied to the evaporator and to heat it slightly above the evaporation temperature. So that these conditions can be achieved despite the different process air properties in the two operating modes, different flow resistances are set on the throttle depending on the operating mode.
  • the dryer advantageously has at least one flow switch for directing the process air, which can be switched at least between a first switching position and a second switching position by means of the control.
  • the flow switch is at least mostly switched in the first switching position during drying chamber operation and at least mostly in the second switching position during room air drying operation.
  • all flow switches arranged in the dryer can be switched over by means of the control.
  • the flow switch is a switching device.
  • the process air follows a different flow path during the room air drying operation and during the drying chamber operation.
  • the drying chamber mode is, for example, a recirculation mode
  • the process air does not leave the dryer, while in the room air drying mode, new air is always drawn in from the room and discharged to the room.
  • the controller changes the flow switches so that the process air flows according to the operating mode. In this way, the user does not have to operate any flow flaps when switching the operating mode, but the control can make the switching automatically.
  • drying chamber operation can be interrupted and switched over to room air drying operation as soon as the room air humidity is too high. This lowers the air humidity in the room so that mold growth in the room can be prevented, for example.
  • the room air drying operation can be carried out in a first step, after which it is switched over to the drying chamber operation.
  • the degree of moisture of the objects to be dried can be determined, for example, by measuring the electrical conductivity of the objects to be dried or by measuring the air humidity of the process air in the drying chamber or after exiting the drying chamber.
  • control is designed in such a way that a movement of the drying chamber, in particular a drum movement, is stopped or reduced when the drying chamber operation is ended and when switching to the room air drying operation.
  • a room humidity can advantageously be monitored, so that if a certain room humidity threshold value is exceeded, the dryer temporarily switches to room air drying operation and then continues drying chamber operation later.
  • At least one flow switch is switched when switching from drying chamber operation to room air drying operation.
  • a flow switch is arranged in such a way that a process air flow through the drying chamber can be prevented, and / or is arranged in the flow direction immediately before or after an inlet into the drying chamber and / or immediately at a dryer air inlet and / or directly at a dryer air outlet.
  • Via the dryer air inlet process air from the room is fed to the dryer and process air is discharged from the dryer into the room via the dryer air outlet.
  • the fact that the flow switch is arranged "immediately" in front of the inlet means that no other components are arranged between the flow switch and the inlet, apart from the flow channel itself.
  • the dryer advantageously has a main filter for cleaning the process air, the main filter being arranged and designed in such a way that the process air flows through it both in the drying chamber mode and in the room air drying mode and both in the drying chamber mode and in the room air drying mode upstream of the evaporator and is arranged in front of the capacitor.
  • this arrangement has the advantage that only a single main filter is required in order to be able to filter the process air in both operating modes.
  • the main filter is arranged upstream of the evaporator and upstream of the condenser in both operating modes. This prevents contamination of these two components.
  • room air drying mode this means that the process air entering the dryer from the room is filtered before it flows through the evaporator and the condenser.
  • drying chamber operation the process air in the drying chamber is contaminated, in particular by the intake of lint.
  • the main filter is thus arranged in such a way that the process air in drying chamber operation is filtered first after exiting the drying chamber before it flows through the evaporator and condenser.
  • control is designed such that the room air drying operation can be switched off or not switched on by the control as soon as a process air temperature or process air humidity or a temperature of the refrigerant or a pressure of the refrigerant measured by means of a measuring device Threshold reached, in particular fell below.
  • the measuring device is arranged and designed in such a way that the process air temperature can be measured in the flow direction upstream of the evaporator and / or in the evaporator.
  • the threshold value is determined in such a way that icing of the evaporator can be prevented or a predetermined maximum ice thickness on the evaporator remains below.
  • the evaporator can freeze up relatively quickly.
  • the drying process is monitored, for example by measuring the temperature or humidity of the process air or the temperature or pressure of the refrigerant.
  • the control system decides on the (continued) operation or initiation of the evaporator defrost.
  • a dryer according to the invention is shown schematically. It has an outer housing 1 with a front side 2a and with a rear side 2b.
  • the dryer further comprises a drying chamber 3, process air channels 3a, means 3b for measuring the degree of moisture in the laundry to be dried, a heat pump with an evaporator 4, a condenser 5, a compressor 6 and a throttle 7.
  • the process air is conveyed by means of a blower 8, steered in the desired flow directions by means of flow switches 9, 10, 11 and filtered by means of the main filter 12.
  • the flow switches 9, 10, 11 are switched via the control 13 and are designed as shut-off valves.
  • Objects to be dried, in particular clothes can be dried with the dryer both in the drying chamber 3, which can be designed as a drum, and in the room in which the dryer is arranged.
  • the dryer has two different operating modes, a drying chamber operation and a room air drying operation. These are now based on the Fig. 1 described in detail.
  • Drying chamber operation is a recirculation mode.
  • the process air flows through the drying chamber 3 several times in a circuit and is not exchanged with the surroundings.
  • the process air emerging from the drying chamber 3 flows through the main filter 12 and is in particular freed of fluff.
  • the process air then flows through the evaporator 4 and is thereby cooled and dehumidified.
  • the dried process air is heated again at the condenser 5 and returns to the drying chamber 3 Drying chamber operation, the flow switches 9 and 10 are closed and the flow switch 11 is open.
  • the flow switches 9 and 10 are open, while the flow switch 11 is closed. Air is drawn in from the room and reaches the dryer via the dryer air inlet 14 and the supply air duct 15. The air flows through the main filter 12, the evaporator 4, the condenser 5 and flows back into the room via the exhaust air duct 16 and the dryer air outlet 17.
  • a tumble dryer of this type is characterized by various properties, which are described in more detail below.
  • the dryer air inlet 14 and the dryer air outlet 17 are arranged on the front side 2a. This makes air exchange with the room particularly easy. In particular, the exiting process air can be blown directly onto the items of clothing hung in the room.
  • the dryer air inlet 14 and the dryer air outlet 17 are spaced as far apart as possible on the front side 2a, so that the dry air emerging through the dryer air outlet 17 does not immediately re-enter the dryer through the dryer air inlet 14. This prevents a short circuit in the process air.
  • the dryer air inlet 14 is arranged relatively close to the evaporator 4. As a result, the process air in the room air drying mode between the dryer air inlet 14 and the evaporator 4 heats up only very slightly due to the operating heat of the dryer, so that the process air does not have to be cooled unnecessarily by the evaporator 4.
  • the throttle 7 is designed as a switchable throttle. For this purpose, it has two parallel, different length capillaries 7a and 7b. The longer capillary 7a has a greater flow resistance than the shorter capillary 7b. About one Three-way valve 7c, which is controlled by the controller 13, the throttle 7 can be switched.
  • the process air In indoor air operation, the process air is at room temperature, i.e. it flows through the evaporator 4 at a low temperature. In the drying chamber mode, the process air flows from the drying chamber 3 directly to the evaporator 4 and is still warm.
  • the throttle 7 By switching the throttle 7, the refrigerant circuit can be adapted to the different prevailing process air temperatures on the evaporator 4 and thus to the different prevailing temperature gradients. In both cases, for efficient operation of the heat pump, the intention is that the refrigerant on the evaporator 4 is completely evaporated and warmed up slightly above the evaporation temperature.
  • the main filter 12 is arranged in the flow direction immediately upstream of the evaporator 4 and upstream of the condenser 5. As a result, the evaporator 4 and the condenser 5 are not or only slightly contaminated by the process air.
  • the main filter 12 is arranged such that the process air first flows through the main filter 12 both in drying chamber operation and in room air drying operation before the process air flows past the evaporator 4 and the condenser 5.
  • the same main filter 12 can be used in both operating modes.
  • the process air humidity can be measured with the measuring device 18. If the dryer is in the drying chamber mode, for example, and the process air humidity drops below a certain threshold value, the drying chamber mode can be switched off or the room air drying mode can be switched over.
  • process air temperature and / or the process air humidity can also be measured with the measuring device 18. If the process air temperature and / or the process air humidity falls below a certain threshold value, for example, during room air drying operation, the room air drying operation is switched off so that the evaporator does not ice up or the ice that has formed on the evaporator can be defrosted.
  • the dryer air inlet 14 is arranged on the rear 2b of the dryer and the dryer air outlet 17 is arranged on the front 2a.
  • the dryer air inlet 14 and the dryer air outlet 17 are spaced even further apart, so that as far as possible no process air escaping into the room through the dryer air outlet 17 immediately gets back into the dryer through the dryer air inlet 14.
  • the flow switches 9 and 10 are open and the flow switch 11 is closed.
  • the flow switches 9 and 10 are closed and the flow switch 11 is open.
  • the process air flow thus flows through drying chamber 3 both in drying chamber operation and in room air drying operation.
  • the device adjustments required in comparison with a dryer without a room air drying function are minor, because the entire flow path between the entry into drying chamber 3 and blower 8 is identical in both operating modes ,
  • the dryer air inlet 14 are arranged on the front side 2a and the dryer air outlet 17 on the rear side 2b. Like in the Execution after Fig. 2 the dryer air inlet 14 and the dryer air outlet 17 are spaced as far apart as possible. Compared to the execution after Fig. 2 there is an advantage in that the process air entering the dryer through the dryer air inlet 14 is immediately led through the evaporator 4 and does not heat up too much in front of the evaporator 4 due to the operating heat of the dryer.
  • FIG. 4 A dryer is shown in which the dryer air inlet 14, the dryer air outlet 17 and the flow switches 9 and 10 are arranged relatively close to one another. This arrangement is intended to ensure that only the flow switches 9 and 10 have to be actuated when switching between room air drying operation and drying chamber operation with respect to the control of the process air flow.
  • the flow switches 9 and 10 arranged close to one another can preferably be actuated via a common mechanism.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Description

Gebiet der ErfindungField of the Invention

Die Erfindung betrifft einen Trockner mit einer Trocknungskammer zur Aufnahme von zu trocknenden Gegenständen, einer Steuerung, und einer Wärmepumpe mit Verdampfer, Kondensator, Drossel und Kompressor. Weiter umfasst der Trockner einen Prozessluftkanal zur Zuführung von mittels der Wärmepumpe getrockneter Prozessluft in die Trocknungskammer und zur Abführung von Prozessluft aus der Trocknungskammer in einem Trocknungskammerbetrieb. Ebenfalls weist der Trockner einen Abluftkanal zum Abführen von mittels der Wärmepumpe getrockneter Prozessluft in einen Raum auf, in welchem der Trockner angeordnet ist, und einen Zuluftkanal zur Zuführung von Prozessluft aus dem Raum zur Wärmepumpe in einem Raumlufttrocknungsbetrieb.The invention relates to a dryer with a drying chamber for receiving objects to be dried, a controller, and a heat pump with an evaporator, condenser, throttle and compressor. The dryer further comprises a process air duct for supplying process air dried by means of the heat pump into the drying chamber and for removing process air from the drying chamber in a drying chamber operation. The dryer also has an exhaust air duct for discharging process air dried by means of the heat pump into a room in which the dryer is arranged, and an air supply duct for supplying process air from the room to the heat pump in a room air drying operation.

Hintergrundbackground

Bei Trommelwäschetrocknern werden Kleidungsstücke in eine Trommel gegeben, damit diesen die Feuchtigkeit entzogen wird. Durch die Trommelbewegungen und durch den starken Prozessluftstrom können die Kleidungsstücke strapaziert werden. Als Alternative dazu ist es deshalb auch bekannt, Kleidungsstücke in einem geschlossenen Raum an Wäscheleinen aufzuhängen und die Raumluft mit einem Raumlufttrocknungsgerät zu trocknen bzw. trocken zu halten. Durch ein im Raumlufttrocknungsgerät angeordnetes Gebläse können die im Raum aufgehängten Kleidungsstücke auch direkt mit der trockenen Luft angeblasen werden. Im Vergleich zu den Trommelwäschetrocknern werden die im Raum aufgehängten Kleidungsstücke schonender, aber langsamer getrocknet.In tumble dryers, items of clothing are placed in a drum to remove moisture from them. The clothes can be stressed by the drum movements and the strong process air flow. As an alternative to this, it is therefore also known to hang items of clothing in an enclosed space on clotheslines and to dry or to keep the room air dry with a room air drying device. A blower arranged in the room air dryer can also be used to blow the clothes hanging in the room directly with the dry air. Compared to tumble dryers the clothes hanging in the room dry more gently but more slowly.

Ebenfalls sind Trommelwäschetrockner bekannt, die zusätzlich eine Raumlufttrocknungsfunktion aufweisen.Drum tumble dryers are also known which additionally have a room air drying function.

EP 2 684 994 zeigt einen Wäschetrockner mit einer Trocknungskammer und einer Raumlufttrocknungsfunktion. Der Wäschetrockner weist einen Aussparungsbereich auf, in welchen ein erster Adapter und ein zweiter Adapter einsetzbar sind. Mit dem ersten Adapter wird ein Umluftbetrieb zur Trocknung von Wäsche in der Trocknungskammer gewährleistet, während beim Einsatz des zweiten Adapters die Raumluft getrocknet werden kann. EP 2 684 994 shows a clothes dryer with a drying chamber and a room air drying function. The clothes dryer has a recess area in which a first adapter and a second adapter can be used. With the first adapter, recirculation mode for drying laundry in the drying chamber is guaranteed, while when using the second adapter, the room air can be dried.

JP 2007 319458 zeigt einen Waschtrockner, welcher einen Trocknungskammerbetrieb und einen Raumlufttrocknungsbetrieb umfasst. Eine Steuerung bewegt Luftklappen zwischen einer ersten und einer zweiten Position, um die Luft im Trocknungskammerbetrieb durch die Trommel und im Raumlufttrocknungsbetrieb in den Raum zu führen. JP 2007 319458 shows a washer dryer, which comprises a drying chamber operation and a room air drying operation. A controller moves air flaps between a first and a second position to guide the air through the drum in the drying chamber mode and into the room in the room air drying mode.

Darstellung der ErfindungPresentation of the invention

Es ist die Aufgabe der vorliegenden Erfindung, einen einfach benutzbaren Trockner, insbesondere einen Trommeltrockner, mit Raumlufttrocknungsfunktion bereitzustellen. Diese Aufgabe wird gelöst durch einen Trockner nach Anspruch 1.It is the object of the present invention to provide an easily usable dryer, in particular a drum dryer, with a room air drying function. This object is achieved by a dryer according to claim 1.

Demgemäss umfasst der Trockner

  • eine Trocknungskammer zur Aufnahme von zu trocknenden Gegenständen,
  • eine Wärmepumpe mit einem Verdampfer, einem Kondensator, einer Drossel und einem Kompressor,
  • einen Prozessluftkanal zur Zuführung von mittels der Wärmepumpe getrockneter Prozessluft in die Trocknungskammer und zur Abführung von Prozessluft aus der Trocknungskammer in einem Trocknungskammerbetrieb,
  • einen Abluftkanal zum Abführen von mittels der Wärmepumpe getrockneter Prozessluft in einen Raum, in welchem der Trockner angeordnet ist, und einen Zuluftkanal zur Zuführung von Prozessluft aus dem Raum zur Wärmepumpe in einem Raumlufttrocknungsbetrieb,
  • eine Steuerung.
Accordingly, the dryer includes
  • a drying chamber to hold objects to be dried,
  • a heat pump with an evaporator, a condenser, a throttle and a compressor,
  • a process air duct for supplying process air dried by means of the heat pump into the drying chamber and for removing process air from the drying chamber in a drying chamber operation,
  • an exhaust air duct for discharging process air dried by means of the heat pump into a room in which the dryer is arranged, and an air supply duct for supplying process air from the room to the heat pump in a room air drying operation,
  • a controller.

Der Trockner weist mindestens ein von der Steuerung steuerbares Umschaltmittel auf, wobei die Steuerung dazu ausgestaltet ist, den Trockner durch Ansteuerung des mindestens einen Umschaltmittels zwischen dem Trocknungskammerbetrieb und dem Raumlufttrocknungsbetrieb umzuschalten.The dryer has at least one switching means that can be controlled by the controller, the controller being designed to switch the dryer between the drying chamber mode and the room air drying mode by controlling the at least one switching device.

Die Begriffe Prozessluftkanal, Abluftkanal und Zuluftkanal sind funktional zu verstehen. Ein einzelner Kanal kann beispielsweise die Funktion des Prozessluftkanals und des Zuluftkanals gleichzeitig übernehmen.The terms process air duct, exhaust air duct and supply air duct are to be understood functionally. For example, a single duct can simultaneously function as the process air duct and the supply air duct.

Die Umschaltung zwischen dem Trocknungskammerbetrieb und dem Raumlufttrocknungsbetrieb mittels der Steuerung hat den Vorteil, dass die Handhabung des Geräts benutzerfreundlicher ist. Beispielsweise kann die Steuerung aufgrund eines Hinweises des Benutzers oder aufgrund eines Messerwertes den Betriebsmodus umschalten. Ein Umschalten kann auch in Abwesenheit des Benutzers möglich sein.Switching between drying chamber operation and room air drying operation using the control has the advantage that the handling of the device is more user-friendly. For example, the control can switch the operating mode based on a message from the user or based on a knife value. Switching can also be possible in the absence of the user.

Mit Vorteil handelt es sich beim Trocknungskammerbetrieb um einen Umluftbetrieb. Damit ist gemeint, dass stets dieselbe Prozessluft mittels der Wärmepumpe getrocknet und durch die Trocknungskammer geblasen wird, und keine Prozessluft in den Raum abgegeben wird.Drying chamber operation is advantageously a recirculation mode. This means that the same process air is always dried by the heat pump and blown through the drying chamber, and no process air is released into the room.

Bei einer bevorzugten Ausführungsform ist die Drossel mittels der Steuerung zumindest zwischen einem ersten Strömungswiderstand und einem zweiten Strömungswiderstand umschaltbar. Die Steuerung ist dabei derart ausgestaltet, dass die Drossel im Trocknungskammerbetrieb zumindest mehrheitlich, insbesondere vollständig, den ersten Strömungswiderstand und im Raumlufttrocknungsbetrieb zumindest mehrheitlich, insbesondere vollständig, den zweiten Strömungswiderstand aufweist. Insbesondere kann die Drossel mindestens zwei umschaltbare Kapillaren aufweisen oder ein verstellbares Expansionsventil sein. Unter einem verstellbaren Expansionsventil ist gemeint, dass der Strömungswiderstand verstellbar ist. Bei der Drossel handelt es sich um ein Umschaltmittel.In a preferred embodiment, the throttle can be switched at least between a first flow resistance and a second flow resistance by means of the control. The controller is designed such that the throttle is at least a majority, in particular completely, in the drying chamber mode, the first flow resistance and at least a majority, in particular completely, in the room air drying mode, has the second flow resistance. In particular, the throttle can have at least two switchable capillaries or can be an adjustable expansion valve. An adjustable expansion valve means that the flow resistance is adjustable. The choke is a switching device.

Durch die Umschaltung der Drossel kann der Trockner an die im Raumlufttrocknungsbetrieb und im Trocknungskammerbetrieb unterschiedlich vorherrschenden Bedingungen der Prozessluft angepasst werden. Im Trocknungskammerbetrieb ist ein relativ kleines Prozessluftvolumen vorhanden. Diejenige Prozessluft, welche mittels dem Kondensator und allenfalls mittels einem weiteren Heizelement aufgeheizt und in die Trocknungskammer geblasen wird, kühlt sich, infolge der vergleichsweise kurzen Strecke bis zum Trommelaustritt, relativ gering ab und strömt deshalb mit noch relativ hoher Temperatur durch den Verdampfer. Im Gegensatz dazu verweilt die Prozessluft beim Raumlufttrocknungsbetrieb relativ lange im Raum, sodass die durch den Verdampfer strömende Prozessluft Raumtemperatur aufweist und daher nicht sonderlich warm ist. Die im Raumlufttrocknungsbetrieb und im Trocknungskammerbetrieb unterschiedlich vorherrschenden Prozesslufttemperaturen führen zu einem unterschiedlichen Temperaturgefälle am Verdampfer beziehungsweise zu sich ändernden Wärmeströmen und beeinflussen damit den Betrieb der Wärmepumpe.By switching the throttle, the dryer can be adapted to the different conditions of the process air in room air drying mode and drying chamber mode. A relatively small volume of process air is available in drying chamber operation. The process air, which is heated up by means of the condenser and possibly by means of a further heating element and blown into the drying chamber, cools down relatively little due to the comparatively short distance to the drum outlet and therefore flows through the evaporator at a relatively high temperature. In contrast, the process air stays in the room air drying operation for a relatively long time, so that the process air flowing through the evaporator has room temperature and is therefore not particularly warm. The different prevailing process air temperatures in the room air drying mode and in the drying chamber mode lead to a different temperature gradient on the evaporator or to changing heat flows and thus influence the operation of the heat pump.

Bei der Wärmepumpe wird für einen effizienten Betrieb beabsichtigt, das Kältemittel durch die am Verdampfer zugeführte Wärme vollständig zu verdampfen und geringfügig über die Verdampfungstemperatur zu erwärmen. Damit diese Bedingungen trotz den unterschiedlichen Prozesslufteigenschaften in den beiden Betriebsmodi erreicht werden können, werden an der Drossel je nach Betriebsmodus unterschiedliche Strömungswiderstände eingestellt.For efficient operation of the heat pump, the intention is to completely evaporate the refrigerant using the heat supplied to the evaporator and to heat it slightly above the evaporation temperature. So that these conditions can be achieved despite the different process air properties in the two operating modes, different flow resistances are set on the throttle depending on the operating mode.

Mit Vorteil weist der Trockner mindestens eine Strömungsweiche zur Lenkung der Prozessluft auf, welche mittels der Steuerung zumindest zwischen einer ersten Schaltposition und einer zweiten Schaltposition umschaltbar ist. Dabei ist die Strömungsweiche während des Trocknungskammerbetriebs zumindest mehrheitlich in der ersten Schaltposition und während des Raumlufttrocknungsbetriebs zumindest mehrheitlich in der zweiten Schaltposition geschaltet. Insbesondere sind sämtliche im Trockner angeordnete Strömungsweichen mittels der Steuerung umschaltbar. Bei der Strömungsweiche handelt es sich um ein Umschaltmittel.The dryer advantageously has at least one flow switch for directing the process air, which can be switched at least between a first switching position and a second switching position by means of the control. The flow switch is at least mostly switched in the first switching position during drying chamber operation and at least mostly in the second switching position during room air drying operation. In particular, all flow switches arranged in the dryer can be switched over by means of the control. The flow switch is a switching device.

Mit anderen Worten ist beispielsweise vorgesehen, dass während des Raumlufttrocknungsbetriebs und während des Trocknungskammerbetriebs die Prozessluft einem anderen Strömungspfad folgt. Handelt es sich beim Trocknungskammerbetrieb beispielsweise um einen Umluftbetrieb, so verlässt die Prozessluft den Trockner dabei nicht, während im Raumlufttrocknungsbetrieb stets neue Luft aus dem Raum angesogen und an den Raum abgeführt wird. Wird zwischen dem Trocknungskammerbetrieb und dem Raumlufttrocknungsbetrieb umgeschaltet, so stellt die Steuerung die Strömungsweichen um, sodass die Prozessluft dem Betriebsmodus entsprechend strömt. Auf diese Weise braucht der Benutzer bei der Umschaltung des Betriebsmodus nicht irgendwelche Strömungsklappen zu betätigen, sondern die Steuerung kann die Umschaltung automatisch vornehmen.In other words, it is provided, for example, that the process air follows a different flow path during the room air drying operation and during the drying chamber operation. If the drying chamber mode is, for example, a recirculation mode, the process air does not leave the dryer, while in the room air drying mode, new air is always drawn in from the room and discharged to the room. If you switch between drying chamber operation and room air drying operation, the controller changes the flow switches so that the process air flows according to the operating mode. In this way, the user does not have to operate any flow flaps when switching the operating mode, but the control can make the switching automatically.

Im Weiteren ist die Steuerung derart ausgestaltet, dass der Trockner vom Trocknungskammerbetrieb mittels der Steuerung in den Raumlufttrocknungsbetrieb umschaltbar ist, wobei

  • die Umschaltung in den Raumlufttrocknungsbetrieb nach Beendigung des Trocknungskammertriebs erfolgt, insbesondere wobei die Umschaltung erfolgt, sobald ein im Trocknungskammerbetrieb gemessener Feuchtegrad der zu trocknenden Gegenstände einen Trocknungskammerfeuchteschwellwert erreicht oder sobald eine vorgegebene Trocknungszeit verstrichen ist, insbesondere wobei der Trockner Mittel zum Messen des Feuchtegrades, insbesondere Elektroden zur Messung eines Widerstandes oder ein Feuchtesensor zur Messung der Luftfeuchtigkeit, aufweist und/oder
  • die Umschaltung in den Raumlufttrocknungsbetrieb erfolgt, sobald eine gemessene Raumluftfeuchtigkeit einen ersten Raumluftfeuchteschwellwert erreicht, insbesondere wobei der erste Raumluftfeuchteschwellwert im Bereich von 50% bis 90% relative Luftfeuchte liegt, und/oder
    die Steuerung ist derart ausgestaltet, dass der Trockner vom Raumlufttrocknungsbetrieb mittels der Steuerung in den Trommeltrocknungsbetrieb umschaltbar ist, sobald eine gemessene Raumluftfeuchtigkeit einen zweiten Raumluftfeuchteschwellwert erreicht, insbesondere wobei der zweite Raumluftfeuchteschwellwert im Bereich von 60% bis 80% oder im Bereich von 40% bis 70% relative Luftfeuchte liegt.
Furthermore, the control is designed in such a way that the dryer can be switched from drying chamber operation by means of the control to room air drying operation, whereby
  • the switchover to room air drying operation takes place after the drying chamber drive has ended, in particular the switchover taking place as soon as a degree of moisture, measured in the drying chamber operation, of the objects to be dried reaches a drying chamber moisture threshold value or as soon as a predefined drying time has passed, in particular where the dryer has means for measuring the degree of moisture, in particular electrodes for measuring a resistance or a moisture sensor for measuring the air humidity, and / or
  • the switchover to room air drying operation takes place as soon as a measured room air humidity reaches a first room air humidity threshold value, in particular wherein the first room air humidity threshold value is in the range from 50% to 90% relative air humidity, and / or
    the control is designed such that the dryer can be switched from the room air drying operation by means of the control to the drum drying operation as soon as a measured room air humidity reaches a second room air humidity threshold value, in particular whereby the second room air humidity threshold value is in the range from 60% to 80% or in the range from 40% to 70 % relative air humidity.

Regelmässig ist erwünscht, dass bestimmte Kleidungsstücke in der Trocknungskammer getrocknet werden sollen, während andere Kleidungsstücke, welche weniger strapazierfähig sind, bevorzugt an Wäscheleinen aufgehängt und im Raum getrocknet werden sollen. Durch die automatische Umschaltung vom Trocknungskammerbetrieb in den Raumlufttrocknungsbetrieb lässt sich dies für den Benutzer einfacher bewerkstelligen. Zu Beginn füllt er einen Teil der Kleidungsstücke in die Trocknungskammer und hängt die übrigen Kleidungsstücke im Raum auf. Anschliessend löst er den Trocknungsvorgang aus und kann den Raum verlassen. Der Trockner beginnt mit dem Trocknungskammerbetrieb. Sobald die Kleidungsstücke in der Trocknungskammer genügend trocken sind, stellt der Trockner automatisch auf den Raumlufttrocknungsbetrieb um. So können sowohl die Kleidungsstücke in der Trocknungskammer, als auch die Kleidungsstücke im Raum getrocknet werden, ohne dass der Benutzer hierfür anwesend sein muss. Im Weiteren ist es beispielsweise auch möglich, dass der Trocknungskammerbetrieb unterbrochen und in den Raumlufttrocknungsbetrieb umgeschaltet wird, sobald die Raumluftfeuchtigkeit zu hoch ist. Dadurch wird die Luftfeuchtigkeit im Raum abgesenkt, sodass beispielsweise eine Schimmelbildung im Raum verhindert werden kann. Im Weiteren kann in einem ersten Schritt der Raumlufttrocknungsbetrieb durchgeführt werden, wobei nach dessen Beendigung in den Trocknungskammerbetrieb umgeschaltet wird.It is regularly desirable that certain items of clothing should be dried in the drying chamber, while other items of clothing that are less hard-wearing should preferably be hung on clotheslines and dried in the room. The automatic switchover from drying chamber operation to room air drying operation makes this easier for the user. At the beginning he fills some of the clothes in the drying chamber and hangs up the other clothes in the room. He then triggers the drying process and can leave the room. The dryer starts operating the drying chamber. As soon as the clothes in the drying chamber are sufficiently dry, the dryer automatically switches to room air drying mode. This means that both the items of clothing in the drying chamber and the items of clothing in the room can be dried without the user having to be present. In the further it is also possible, for example, for drying chamber operation to be interrupted and switched over to room air drying operation as soon as the room air humidity is too high. This lowers the air humidity in the room so that mold growth in the room can be prevented, for example. In addition, the room air drying operation can be carried out in a first step, after which it is switched over to the drying chamber operation.

Der Feuchtegrad der zu trocknenden Gegenstände kann beispielsweise ermittelt werden, indem die elektrische Leitfähigkeit der zu trocknenden Gegenstände gemessen wird oder indem die Luftfeuchtigkeit der Prozessluft in der Trocknungskammer oder nach Austritt aus der Trocknungskammer gemessen wird.The degree of moisture of the objects to be dried can be determined, for example, by measuring the electrical conductivity of the objects to be dried or by measuring the air humidity of the process air in the drying chamber or after exiting the drying chamber.

Im Weiteren ist die Steuerung derart ausgestaltet, dass bei Beendigung des Trocknungskammerbetriebs und beim Umschalten in den Raumlufttrocknungsbetrieb eine Bewegung der Trocknungskammer, insbesondere eine Trommelbewegung, gestoppt oder reduziert wird.Furthermore, the control is designed in such a way that a movement of the drying chamber, in particular a drum movement, is stopped or reduced when the drying chamber operation is ended and when switching to the room air drying operation.

Mit Vorteil kann eine Raumluftfeuchtigkeit überwacht werden, sodass bei Überschreitung eines bestimmten Raumluftfeuchtigkeitsschwellwertes der Trockner vorübergehend in den Raumlufttrocknungsbetrieb umschaltet, und später den Trocknungskammerbetrieb fortsetzt.A room humidity can advantageously be monitored, so that if a certain room humidity threshold value is exceeded, the dryer temporarily switches to room air drying operation and then continues drying chamber operation later.

In einer bevorzugten Ausführungsform wird bei der Umschaltung vom Trocknungskammerbetrieb in den Raumlufttrocknungsbetrieb mindestens eine Strömungsweiche umgeschaltet.In a preferred embodiment, at least one flow switch is switched when switching from drying chamber operation to room air drying operation.

Im Weiteren ist jeweils eine Strömungsweiche derart angeordnet, dass eine Prozessluftströmung durch die Trocknungskammer verhinderbar ist, und/oder in Strömungsrichtung jeweils unmittelbar vor oder nach einem Einlass in die Trocknungskammer und/oder unmittelbar bei einem Trocknerlufteinlass und/oder unmittelbar bei einem Trocknerluftauslass angeordnet ist. Über den Trocknerlufteinlass wird Prozessluft aus dem Raum dem Trockner zugeführt und über den Trocknerluftauslass wird Prozessluft aus dem Trockner in den Raum abgeführt. Dass beispielsweise die Strömungsweiche "unmittelbar" vor dem Einlass angeordnet ist, bedeutet, dass zwischen der Strömungsweiche und dem Einlass keine weiteren Komponenten angeordnet sind, ausser dem Strömungskanal selbst.Furthermore, a flow switch is arranged in such a way that a process air flow through the drying chamber can be prevented, and / or is arranged in the flow direction immediately before or after an inlet into the drying chamber and / or immediately at a dryer air inlet and / or directly at a dryer air outlet. Via the dryer air inlet process air from the room is fed to the dryer and process air is discharged from the dryer into the room via the dryer air outlet. For example, the fact that the flow switch is arranged "immediately" in front of the inlet means that no other components are arranged between the flow switch and the inlet, apart from the flow channel itself.

Mit Vorteil weist der Trockner zur Reinigung der Prozessluft einen Hauptfilter auf, wobei der Hauptfilter derart angeordnet und ausgestaltet ist, dass er sowohl im Trocknungskammerbetrieb als auch im Raumlufttrocknungsbetrieb von der Prozessluft durchströmt ist und sowohl im Trocknungskammerbetrieb als auch im Raumlufttrocknungsbetrieb in Strömungsrichtung vor dem Verdampfer und vor dem Kondensator angeordnet ist.The dryer advantageously has a main filter for cleaning the process air, the main filter being arranged and designed in such a way that the process air flows through it both in the drying chamber mode and in the room air drying mode and both in the drying chamber mode and in the room air drying mode upstream of the evaporator and is arranged in front of the capacitor.

Diese Anordnung hat einerseits den Vorteil, dass nur ein einziger Hauptfilter benötigt wird, um die Prozessluft in beiden Betriebsmodi filtern zu können. Andererseits ist der Hauptfilter in beiden Betriebsmodi in Strömungsrichtung vor dem Verdampfer und vor dem Kondensator angeordnet. Damit wird eine Verschmutzung dieser beiden Komponenten verhindert. Dies bedeutet im Raumlufttrocknungsbetrieb, dass die aus dem Raum in den Trockner eintretende Prozessluft vor dem Durchströmen des Verdampfers und des Kondensators gefiltert wird. Im Trocknungskammerbetrieb wird die Prozessluft in der Trocknungskammer, insbesondere durch die Aufnahme von Flusen, verschmutzt. Somit ist der Hauptfilter derart angeordnet, dass die Prozessluft im Trocknungskammerbetrieb nach Austritt aus der Trocknungskammer zuerst gefiltert wird, bevor sie durch den Verdampfer und Kondensator strömt.On the one hand, this arrangement has the advantage that only a single main filter is required in order to be able to filter the process air in both operating modes. On the other hand, the main filter is arranged upstream of the evaporator and upstream of the condenser in both operating modes. This prevents contamination of these two components. In room air drying mode, this means that the process air entering the dryer from the room is filtered before it flows through the evaporator and the condenser. In drying chamber operation, the process air in the drying chamber is contaminated, in particular by the intake of lint. The main filter is thus arranged in such a way that the process air in drying chamber operation is filtered first after exiting the drying chamber before it flows through the evaporator and condenser.

Im Weiteren ist die Steuerung derart ausgestaltet, dass der Raumlufttrocknungsbetrieb mittels der Steuerung abschaltbar oder nicht einschaltbar ist, sobald eine mittels einer Messvorrichtung gemessene Prozesslufttemperatur oder Prozessluftfeuchte oder eine Temperatur des Kältemittels oder ein Druck des Kältemittels einen Schwellwert erreicht, insbesondere unterschritten hat. Insbesondere ist die Messvorrichtung derart angeordnet und ausgestaltet, dass die Prozesslufttemperatur in Strömungsrichtung vor dem Verdampfer und/oder im Verdampfer messbar ist.Furthermore, the control is designed such that the room air drying operation can be switched off or not switched on by the control as soon as a process air temperature or process air humidity or a temperature of the refrigerant or a pressure of the refrigerant measured by means of a measuring device Threshold reached, in particular fell below. In particular, the measuring device is arranged and designed in such a way that the process air temperature can be measured in the flow direction upstream of the evaporator and / or in the evaporator.

Insbesondere ist der Schwellwert derart festgelegt, dass eine Vereisung des Verdampfers verhinderbar ist oder eine vorgegebene maximale Eisdicke am Verdampfer unterschritten bleibt.In particular, the threshold value is determined in such a way that icing of the evaporator can be prevented or a predetermined maximum ice thickness on the evaporator remains below.

Je nach Raumtemperatur und Feuchtigkeit kann der Verdampfer relativ rasch vereisen. Um eine zu starke Vereisung zu verhindern oder um eine Vereisung vollständig zu verhindern, wird der Trocknungsprozess überwacht, beispielsweise durch Messung der Temperatur oder der Feuchte der Prozessluft oder der Temperatur oder des Drucks des Kältemittels. Anhand einer oder mehrerer dieser Messwerte entscheidet die Steuerung über den (Weiter-)Betrieb bzw. das Einleiten der Verdampfer-Abtauung.Depending on the room temperature and humidity, the evaporator can freeze up relatively quickly. To prevent excessive icing or to completely prevent icing, the drying process is monitored, for example by measuring the temperature or humidity of the process air or the temperature or pressure of the refrigerant. On the basis of one or more of these measured values, the control system decides on the (continued) operation or initiation of the evaporator defrost.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Weitere Ausgestaltungen, Vorteile und Anwendungen der Erfindung ergeben sich aus den abhängigen Ansprüchen und aus der nun folgenden Beschreibung anhand der Figuren. Dabei zeigen:

  • Fig. 1 einen Trockner mit einem Trocknerlufteinlass und mit einem Trocknerluftauslass an der Vorderseite,
  • Fig. 2 einen Trockner mit einem Trocknerlufteinlass an der Rückseite und einem Trocknerluftauslass an der Vorderseite,
  • Fig. 3 einen Trockner mit einem Trocknerlufteinlass an der Vorderseite und einem Trocknerluftauslass an der Rückseite, und
  • Fig. 4 einen Trockner mit nahe zueinander angeordneten Trocknerlufteinlass und Trocknerluftauslass an der Vorderseite.
Further refinements, advantages and applications of the invention result from the dependent claims and from the following description based on the figures. Show:
  • Fig. 1 a dryer with a dryer air inlet and a dryer air outlet on the front,
  • Fig. 2 a dryer with a dryer air inlet on the back and a dryer air outlet on the front,
  • Fig. 3 a dryer with a dryer air inlet on the front and a dryer air outlet on the rear, and
  • Fig. 4 a dryer with dryer air inlet and dryer air outlet located close to each other at the front.

Wege zur Ausführung der ErfindungWays of Carrying Out the Invention

In Fig. 1 ist ein erfindungsgemässer Trockner schematisch dargestellt. Er weist ein Aussengehäuse 1 mit einer Frontseite 2a und mit einer Rückseite 2b auf. Weiter umfasst der Trockner eine Trocknungskammer 3, Prozessluftkanäle 3a, Mittel 3b zum Messen des Feuchtegrades der zu trocknenden Wäsche, eine Wärmepumpe mit einem Verdampfer 4, einem Kondensator 5, einem Kompressor 6 und einer Drossel 7. Die Prozessluft wird mittels einem Gebläse 8 gefördert, mittels Strömungsweichen 9, 10, 11 in die gewünschten Strömungsrichtungen gelenkt und mittels dem Hauptfilter 12 gefiltert. Die Strömungsweichen 9, 10, 11 werden dabei über die Steuerung 13 geschaltet und sind als Absperrventile ausgestaltet.In Fig. 1 a dryer according to the invention is shown schematically. It has an outer housing 1 with a front side 2a and with a rear side 2b. The dryer further comprises a drying chamber 3, process air channels 3a, means 3b for measuring the degree of moisture in the laundry to be dried, a heat pump with an evaporator 4, a condenser 5, a compressor 6 and a throttle 7. The process air is conveyed by means of a blower 8, steered in the desired flow directions by means of flow switches 9, 10, 11 and filtered by means of the main filter 12. The flow switches 9, 10, 11 are switched via the control 13 and are designed as shut-off valves.

Mit dem Trockner können zu trocknende Gegenstände, insbesondere Kleider, sowohl in der Trocknungskammer 3, welche als Trommel ausgestaltet sein kann, als auch im Raum, in welchem der Trockner angeordnet ist, getrocknet werden. Für diese beiden Möglichkeiten weist der Trockner zwei unterschiedliche Betriebsmodi, einen Trocknungskammerbetrieb und einen Raumlufttrocknungsbetrieb, auf. Diese werden nun anhand der Fig. 1 im Einzelnen beschrieben.Objects to be dried, in particular clothes, can be dried with the dryer both in the drying chamber 3, which can be designed as a drum, and in the room in which the dryer is arranged. For these two options, the dryer has two different operating modes, a drying chamber operation and a room air drying operation. These are now based on the Fig. 1 described in detail.

Beim Trocknungskammerbetrieb handelt es sich um einen Umluftbetrieb. Die Prozessluft strömt in einem Kreislauf mehrfach durch die Trocknungskammer 3 und wird nicht mit der Umgebung ausgetauscht. Die aus der Trocknungskammer 3 austretende Prozessluft strömt durch den Hauptfilter 12 und wird dabei insbesondere von Flusen befreit. Anschliessend strömt die Prozessluft durch den Verdampfer 4 und wird dadurch abgekühlt und entfeuchtet. Die getrocknete Prozessluft wird am Kondensator 5 wieder erwärmt und gelangt zurück in die Trocknungskammer 3. Im Trocknungskammerbetrieb sind die Strömungsweichen 9 und 10 geschlossen und die Strömungsweiche 11 ist offen.Drying chamber operation is a recirculation mode. The process air flows through the drying chamber 3 several times in a circuit and is not exchanged with the surroundings. The process air emerging from the drying chamber 3 flows through the main filter 12 and is in particular freed of fluff. The process air then flows through the evaporator 4 and is thereby cooled and dehumidified. The dried process air is heated again at the condenser 5 and returns to the drying chamber 3 Drying chamber operation, the flow switches 9 and 10 are closed and the flow switch 11 is open.

Im Raumlufttrocknungsbetrieb sind die Strömungsweichen 9 und 10 offen, während die Strömungsweiche 11 geschlossen ist. Luft wird aus dem Raum angesogen und gelangt über den Trocknerlufteinlass 14 und den Zuluftkanal 15 in den Trockner. Die Luft strömt durch den Hauptfilter 12, den Verdampfer 4, den Kondensator 5 und strömt über den Abluftkanal 16 und den Trocknerluftauslass 17 zurück in den Raum.In the room air drying operation, the flow switches 9 and 10 are open, while the flow switch 11 is closed. Air is drawn in from the room and reaches the dryer via the dryer air inlet 14 and the supply air duct 15. The air flows through the main filter 12, the evaporator 4, the condenser 5 and flows back into the room via the exhaust air duct 16 and the dryer air outlet 17.

Ein Wäschetrockner dieser Art zeichnet sich durch verschiedene Eigenschaften auf, welche im Folgenden näher beschrieben werden.A tumble dryer of this type is characterized by various properties, which are described in more detail below.

Der Trocknerlufteinlass 14 und der Trocknerluftauslass 17 sind an der Frontseite 2a angeordnet. Dadurch gestaltet sich der Luftaustausch mit dem Raum besonders einfach. Insbesondere kann die austretende Prozessluft direkt auf die im Raum aufgehängten Kleidungsstücke geblasen werden. Der Trocknerlufteinlass 14 und der Trocknerluftauslass 17 sind an der Frontseite 2a möglichst weit voneinander beabstandet, sodass die durch den Trocknerluftauslass 17 austretende trockene Luft nicht durch den Trocknerlufteinlass 14 sofort wieder in den Trockner eintritt. Ein Kurzschluss der Prozessluft wird dadurch vermieden.The dryer air inlet 14 and the dryer air outlet 17 are arranged on the front side 2a. This makes air exchange with the room particularly easy. In particular, the exiting process air can be blown directly onto the items of clothing hung in the room. The dryer air inlet 14 and the dryer air outlet 17 are spaced as far apart as possible on the front side 2a, so that the dry air emerging through the dryer air outlet 17 does not immediately re-enter the dryer through the dryer air inlet 14. This prevents a short circuit in the process air.

Der Trocknerlufteinlass 14 ist relativ nahe am Verdampfer 4 angeordnet. Dadurch erwärmt sich die Prozessluft im Raumlufttrocknungsbetrieb zwischen dem Trocknerlufteinlass 14 und dem Verdampfer 4 durch die Betriebswärme des Trockners nur sehr geringfügig, sodass die Prozessluft durch den Verdampfer 4 nicht unnötig stark gekühlt werden muss.The dryer air inlet 14 is arranged relatively close to the evaporator 4. As a result, the process air in the room air drying mode between the dryer air inlet 14 and the evaporator 4 heats up only very slightly due to the operating heat of the dryer, so that the process air does not have to be cooled unnecessarily by the evaporator 4.

Die Drossel 7 ist als eine umschaltbare Drossel ausgestaltet. Hierfür weist sie zwei parallel verlaufende, unterschiedlich lange Kapillaren 7a und 7b auf. Die längere Kapillare 7a weist einen grösseren Strömungswiderstand auf, als die kürzere Kapillare 7b. Über ein Dreiwegeventil 7c, welches durch die Steuerung 13 gesteuert wird, kann die Drossel 7 umgeschaltet werden.The throttle 7 is designed as a switchable throttle. For this purpose, it has two parallel, different length capillaries 7a and 7b. The longer capillary 7a has a greater flow resistance than the shorter capillary 7b. About one Three-way valve 7c, which is controlled by the controller 13, the throttle 7 can be switched.

Im Raumluftbetrieb weist die Prozessluft Raumtemperatur auf, d.h. sie strömt mit niedriger Temperatur durch den Verdampfer 4. Im Trocknungskammerbetrieb strömt die Prozessluft aus der Trocknungskammer 3 direkt zum Verdampfer 4 und ist dabei noch warm. Durch die Umschaltung der Drossel 7 kann der Kältemittelkreislauf den am Verdampfer 4 unterschiedlich vorherrschenden Prozesslufttemperaturen und somit den unterschiedlich vorherrschenden Temperaturgefällen angepasst werden. Denn in beiden Fällen wird für einen effizienten Betrieb der Wärmepumpe beabsichtigt, dass das Kältemittel am Verdampfer 4 vollständig verdampft und geringfügig über die Verdampfungstemperatur erwärmt wird.In indoor air operation, the process air is at room temperature, i.e. it flows through the evaporator 4 at a low temperature. In the drying chamber mode, the process air flows from the drying chamber 3 directly to the evaporator 4 and is still warm. By switching the throttle 7, the refrigerant circuit can be adapted to the different prevailing process air temperatures on the evaporator 4 and thus to the different prevailing temperature gradients. In both cases, for efficient operation of the heat pump, the intention is that the refrigerant on the evaporator 4 is completely evaporated and warmed up slightly above the evaporation temperature.

Der Hauptfilter 12 ist in Strömungsrichtung unmittelbar vor dem Verdampfer 4 und vor dem Kondensator 5 angeordnet. Dadurch werden der Verdampfer 4 und der Kondensator 5 nicht oder nur geringfügig von der Prozessluft verschmutzt. Der Hauptfilter 12 ist derart angeordnet, dass die Prozessluft sowohl im Trocknungskammerbetrieb als auch im Raumlufttrocknungsbetrieb zuerst durch den Hauptfilter 12 strömt, bevor die Prozessluft am Verdampfer 4 und am Kondensator 5 vorbeiströmt. In beiden Betriebsmodi kann derselbe Hauptfilter 12 verwendet werden.The main filter 12 is arranged in the flow direction immediately upstream of the evaporator 4 and upstream of the condenser 5. As a result, the evaporator 4 and the condenser 5 are not or only slightly contaminated by the process air. The main filter 12 is arranged such that the process air first flows through the main filter 12 both in drying chamber operation and in room air drying operation before the process air flows past the evaporator 4 and the condenser 5. The same main filter 12 can be used in both operating modes.

In Strömungsrichtung unmittelbar vor dem Verdampfer 4 ist eine Messvorrichtung 18 angeordnet, welche mit der Steuerung 13 verbunden ist. Mit der Messvorrichtung 18 kann zum einen die Prozessluftfeuchtigkeit gemessen werden. Befindet sich der Trockner beispielsweise im Trocknungskammerbetrieb und sinkt die Prozessluftfeuchtigkeit unter einen bestimmten Schwellwert, so kann der Trocknungskammerbetrieb abgeschaltet oder es kann in den Raumlufttrocknungsbetrieb umgeschaltet werden.A measuring device 18, which is connected to the controller 13, is arranged in the flow direction immediately upstream of the evaporator 4. The process air humidity can be measured with the measuring device 18. If the dryer is in the drying chamber mode, for example, and the process air humidity drops below a certain threshold value, the drying chamber mode can be switched off or the room air drying mode can be switched over.

Im Weiteren kann mit der Messvorrichtung 18 auch die Prozesslufttemperatur und/oder die Prozessluftfeuchtigkeit gemessen werden. Sinkt die Prozesslufttemperatur und/oder die Prozessluftfeuchtigkeit beispielsweise während des Raumlufttrocknungsbetriebs unter einen bestimmten Schwellwert, so wird der Raumlufttrocknungsbetrieb abgeschaltet, damit der Verdampfer nicht vereist oder damit das Eis, welches sich am Verdampfer gebildet hat abgetaut werden kann.Furthermore, the process air temperature and / or the process air humidity can also be measured with the measuring device 18. If the process air temperature and / or the process air humidity falls below a certain threshold value, for example, during room air drying operation, the room air drying operation is switched off so that the evaporator does not ice up or the ice that has formed on the evaporator can be defrosted.

In den Fig. 2 bis 4 werden weitere Ausführungsformen des Trockners mit einem geringeren Detaillierungsgrad als in Fig. 1 dargestellt. Es werden nicht mehr alle Komponenten dargestellt. Die Unterschiede zur Ausführungsform aus Fig. 1 werden im Folgenden beschrieben.In the 2 to 4 are further embodiments of the dryer with a lower level of detail than in Fig. 1 shown. Not all components are shown anymore. The differences from the embodiment Fig. 1 are described below.

In Fig. 2 ist der Trocknerlufteinlass 14 an der Rückseite 2b des Trockners und der Trocknerluftauslass 17 an der Vorderseite 2a angeordnet. Dadurch sind der Trocknerlufteinlass 14 und der Trocknerluftauslass 17 noch weiter voneinander beabstandet, sodass möglichst keine durch den Trocknerluftauslass 17 in den Raum austretende Prozessluft durch den Trocknerlufteinlass 14 sofort wieder in den Trockner gelangt.In Fig. 2 the dryer air inlet 14 is arranged on the rear 2b of the dryer and the dryer air outlet 17 is arranged on the front 2a. As a result, the dryer air inlet 14 and the dryer air outlet 17 are spaced even further apart, so that as far as possible no process air escaping into the room through the dryer air outlet 17 immediately gets back into the dryer through the dryer air inlet 14.

Im Raumlufttrocknungsbetrieb sind die Strömungsweichen 9 und 10 offen und die Strömungsweiche 11 ist geschlossen. Im Trocknungskammerbetrieb sind die Strömungsweichen 9 und 10 geschlossen und die Strömungsweiche 11 ist offen. Der Prozessluftstrom strömt somit sowohl im Trocknungskammerbetrieb als auch im Raumlufttrocknungsbetrieb durch die Trocknungskammer 3. Dadurch sind die im Vergleich mit einem Trockner ohne Raumlufttrocknungsfunktion notwendigen Geräteanpassungen geringfügig, weil der gesamte Strömungspfad zwischen dem Eintritt in die Trocknungskammer 3 und dem Gebläse 8 in beiden Betriebsmodi identisch ist.In the room air drying operation, the flow switches 9 and 10 are open and the flow switch 11 is closed. In the drying chamber mode, the flow switches 9 and 10 are closed and the flow switch 11 is open. The process air flow thus flows through drying chamber 3 both in drying chamber operation and in room air drying operation. As a result, the device adjustments required in comparison with a dryer without a room air drying function are minor, because the entire flow path between the entry into drying chamber 3 and blower 8 is identical in both operating modes ,

In der Ausführung nach Fig. 3 sind der Trocknerlufteinlass 14 an der Vorderseite 2a und der Trocknerluftauslass 17 an der Rückseite 2b angeordnet. Wie in der Ausführung nach Fig. 2 sind der Trocknerlufteinlass 14 und der Trocknerluftauslass 17 möglichst weit voneinander beabstandet. Im Vergleich zur Ausführung nach Fig. 2 besteht ein Vorteil darin, dass die durch den Trocknerlufteinlass 14 in den Trockner eintretende Prozessluft sofort durch den Verdampfer 4 geführt wird und sich vor dem Verdampfer 4 durch die Betriebswärme des Trockners nicht zu stark erwärmt.In execution after Fig. 3 the dryer air inlet 14 are arranged on the front side 2a and the dryer air outlet 17 on the rear side 2b. Like in the Execution after Fig. 2 the dryer air inlet 14 and the dryer air outlet 17 are spaced as far apart as possible. Compared to the execution after Fig. 2 there is an advantage in that the process air entering the dryer through the dryer air inlet 14 is immediately led through the evaporator 4 and does not heat up too much in front of the evaporator 4 due to the operating heat of the dryer.

In Fig. 4 ist ein Trockner dargestellt, bei welchem der Trocknerlufteinlass 14, der Trocknerluftauslass 17 und die Strömungsweichen 9 und 10 relativ nahe zueinander angeordnet sind. Durch diese Anordnung soll erreicht werden, dass bei der Umschaltung zwischen Raumlufttrocknungsbetrieb und Trocknungskammerbetrieb in Bezug auf die Lenkung des Prozessluftstroms lediglich die Strömungsweichen 9 und 10 betätigt werden müssen. Die nahe zueinander angeordneten Strömungsweichen 9 und 10 können bevorzugt über einen gemeinsamen Mechanismus betätigt werden.In Fig. 4 A dryer is shown in which the dryer air inlet 14, the dryer air outlet 17 and the flow switches 9 and 10 are arranged relatively close to one another. This arrangement is intended to ensure that only the flow switches 9 and 10 have to be actuated when switching between room air drying operation and drying chamber operation with respect to the control of the process air flow. The flow switches 9 and 10 arranged close to one another can preferably be actuated via a common mechanism.

Bemerkungen:

  • Der Trockner kann eine Abtauvorrichtung aufweisen, um den Verdampfer von Eis zu befreien, welches insbesondere während des Raumlufttrocknungsbetriebs entsteht.
  • Der Trockner kann für jeden Betriebsmodus, d.h. sowohl für den Raumlufttrocknungsbetrieb, als auch für den Trocknungskammerbetrieb, unterschiedliche Betriebsprogramme aufweisen, mit welchen die zu trocknenden Gegenstände, beispielsweise in unterschiedlichen Zeitdauern oder bei unterschiedlichem Stromverbrauch, getrocknet werden. Beispielsweise kann der Kompressor auf unterschiedlichen Leistungsstufen betrieben werden.
  • Bei der Wärmepumpe kann ein Zusatzwärmetauscher angeordnet sein, welcher zusätzlich zum Kondensator 5 Wärmeenergie aus dem Kältemittel aus dem Trockner abführt. Dadurch kann der Trocknungsprozess effizienter und schneller ausgestaltet sein.
  • Die Drossel 7 kann als Expansionsventil ausgestaltet sein, mit welchem der Drosselwiderstand je nach Betriebsmodus unterschiedlich eingestellt werden kann.
  • Mit Vorteil können am Trocknerlufteinlass 14 und am Trocknerluftauslass 17 Luftführungsvorrichtungen, beispielsweise Schläuche, angeordnet sein, mit welchen die Luft von einem bestimmten Ort im Raum abgesogen oder an einen bestimmten Ort im Raum hingeführt werden kann.
  • Zur Verbesserung der Luftqualität kann im Trockner ein Aktivkohlefilter angeordnet sein oder es kann eine Photokatalyse durchgeführt werden. Mittels einer Duftpatrone kann der Prozessluft ein gewünschter Duft zugesetzt werden.
  • Im Weiteren kann auch ein Betriebsmodus vorgesehen sein, bei welchem die Prozessluft wie im Raumlufttrocknungsbetrieb geführt wird, aber mit zusätzlicher Feuchtigkeit versehen werden kann, damit die im Raum aufgehängten Kleidungsstücke entknittert werden können.
Remarks:
  • The dryer can have a defrosting device in order to free the evaporator of ice, which arises in particular during the room air drying operation.
  • The dryer can have different operating programs for each operating mode, ie both for the room air drying operation and for the drying chamber operation, with which the objects to be dried are dried, for example in different time periods or with different power consumption. For example, the compressor can be operated at different power levels.
  • An additional heat exchanger can be arranged in the heat pump, which is in addition to the condenser 5 dissipates thermal energy from the refrigerant from the dryer. As a result, the drying process can be made more efficient and faster.
  • The throttle 7 can be designed as an expansion valve with which the throttle resistance can be set differently depending on the operating mode.
  • Air guiding devices, for example hoses, can advantageously be arranged on the dryer air inlet 14 and on the dryer air outlet 17, with which the air can be drawn off from a specific location in the room or can be guided to a specific location in the room.
  • To improve the air quality, an activated carbon filter can be arranged in the dryer or photocatalysis can be carried out. A desired fragrance can be added to the process air using a fragrance cartridge.
  • Furthermore, an operating mode can also be provided in which the process air is conducted as in room air drying operation, but can be provided with additional moisture so that the items of clothing hung in the room can be wrinkled.

Während in der vorliegenden Anmeldung bevorzugte Ausführungen der Erfindung beschrieben sind, ist klar darauf hinzuweisen, dass die Erfindung nicht auf diese beschränkt ist und in auch anderer Weise innerhalb des Umfangs der folgenden Ansprüche ausgeführt werden kann.While preferred embodiments of the invention are described in the present application, it should be clearly pointed out that the invention is not restricted to these and can also be carried out in other ways within the scope of the following claims.

Claims (10)

  1. Dryer, in particular drum dryer, comprising
    - a drying chamber (3) for receiving objects to be dried,
    - a heat pump (4-7) with an evaporator (4), a condenser (5), a throttle (7) and a compressor (6),
    - a process air duct (3a) for feeding process air dried by the heat pump (4-7) into the drying chamber (3) and for discharging process air from the drying chamber (3) in a drying chamber operation mode,
    - an exhaust air duct (16) for discharging process air dried by the heat pump into a room in which the dryer is arranged, and a supply air duct (15) for supplying process air from the room to the heat pump (4-7) in a room air drying operation mode,
    - a controller (13),
    - switching means (7, 9-11) controllable by the controller (13),
    wherein the controller (13) is designed to switch the dryer between the drying chamber operation mode and the room air drying operation mode by controlling the at least one switching means (7, 9-11),
    characterized in that the controller (13) is designed such that the dryer can be switched automatically from the drying chamber operation mode to the room air drying operation mode, wherein
    - the switch to the room air drying mode after termination of the drying chamber operation mode takes place as soon as a degree of moisture of the objects to be dried, measured during the drying chamber operation mode, reaches a drying chamber moisture threshold value, in particular falls below it, or as soon as a predetermined drying time has elapsed, and/or
    - the switch to the room air drying mode takes place as soon as a measured room air humidity reaches a first room air humidity threshold value,
    and/or
    in that the controller (13) is designed such that the dryer can be switched by the controller from the room air drying operation mode (13) to the drum drying operation mode as soon as a measured room air humidity reaches a second room air humidity threshold value.
  2. Dryer according to claim 1, wherein the drying chamber operation mode is a circulating air operation mode.
  3. Dryer according to one of the preceding claims, wherein the throttle (7) can be switched by the controller (13) at least between a first flow resistance and a second flow resistance and the controller (13) is designed such that the throttle (7) has mostly the first flow resistance in the drying chamber operation mode and mostly the second flow resistance in the room air drying operation mode,
    in particular wherein the throttle (7) has at least two switchable capillaries (7a, 7b) or is an adjustable expansion valve.
  4. Dryer according to one of the preceding claims, wherein the dryer has means for measuring the degree of moisture, in particular electrodes for measuring a resistance or a moisture sensor for measuring the air humidity, and/or
    - the switch to the room air drying mode takes place as soon as a measured room air humidity exceeds a first room air humidity threshold value, in particular wherein the first room air humidity threshold value is in the range of 50% to 90% relative humidity,
    and/or
    wherein the controller (13) is designed such that the dryer can be switched by the controller (13) from the room air drying operation mode into the drum drying operation mode as soon as a measured room air humidity falls below a second room air humidity threshold value, in particular wherein the second room air humidity threshold value lies in the range from 60% to 80% or in the range from 40% to 70% relative humidity.
  5. Dryer according to one of the preceding claims, wherein the dryer comprises at least one flow switch (9-11) for directing the process air, which can be switched by the controller (13) at least between a first switching position and a second switching position such that the flow switch (9-11) is switched mostly in the first switching position during the drying chamber operation mode and at mostly in the second switching position during the room air drying operation mode,
    in particular wherein all flow switches (9-11) arranged in the dryer can be switched the controller (13) .
  6. Dryer according to claim 5, wherein the controller (13) is designed such that the at least one flow switch (9-11) is switched if switching from the drying chamber operation mode to the room air drying operation mode.
  7. Dryer according to one of the claims 5 to 6,
    wherein the at least one flow switch (9-11) is arranged such that a process air flow through the drying chamber can be prevented, and/or
    wherein a flow switch (9-11) is arranged in the direction of flow directly before or after an inlet into the drying chamber (3) and/or directly at a dryer air inlet (14) and/or directly at a dryer air outlet (17), and/or
    wherein a flow switch (9-11)
    is arranged in the direction of a process air flow after the condenser and before the evaporator.
  8. Dryer according to one of the preceding claims, wherein the dryer has a main filter (12) for cleaning the process air, wherein the main filter (12) is arranged and designed such that the process air flows through it both in the drying chamber operation mode and in the room air drying operation mode and it is arranged both in the drying chamber operation mode and in the room air drying operation mode in the flow direction before the evaporator (4) and after the condenser (5).
  9. Dryer according to one of the preceding claims, wherein the controller (13) is designed such that the room air drying operation mode can be switched off or cannot be switched on by the controller (13), and/or a defrosting operation can be switched on,
    as soon as a process air temperature and/or a process air humidity and/or a temperature of the refrigerant and/or a pressure of the refrigerant, measured by a measuring device (18), reaches a threshold value, in particular has fallen below it,
    in particular wherein the measuring device (18) is arranged and designed such that the process air temperature and/or the process air humidity can be measured before the evaporator (4) in the flow direction.
  10. Dryer according to claim 9, wherein the threshold value is determined in such a way that icing of the evaporator (4) can be prevented or a predetermined maximum ice thickness at the evaporator is not reached.
EP18160230.1A 2017-04-06 2018-03-06 Drum dryer with room air drying function Active EP3392396B1 (en)

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CH00468/17A CH711885B1 (en) 2017-04-06 2017-04-06 Dryers, in particular drum dryers with a room air drying function.

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WO2022108151A1 (en) * 2020-11-20 2022-05-27 삼성전자주식회사 Dryer and method for controlling same
WO2022108100A1 (en) * 2020-11-20 2022-05-27 삼성전자주식회사 Dryer and method for controlling same
US20220356635A1 (en) * 2021-05-06 2022-11-10 Haier Us Appliance Solutions, Inc. Ambient air dehumidification system for a condenser or heat pump laundry appliance
CN113338013B (en) * 2021-06-24 2022-09-02 海信冰箱有限公司 Control method and device of clothes dryer and clothes dryer

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JP2007319458A (en) * 2006-06-01 2007-12-13 Matsushita Electric Ind Co Ltd Washing and drying machine
DE102012212162A1 (en) * 2012-07-11 2014-01-16 BSH Bosch und Siemens Hausgeräte GmbH Dryer with heat pump with additional suitability for a dehumidification and process for its operation

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