EP3775359A1 - A laundry dryer with heat pump - Google Patents

A laundry dryer with heat pump

Info

Publication number
EP3775359A1
EP3775359A1 EP19708999.8A EP19708999A EP3775359A1 EP 3775359 A1 EP3775359 A1 EP 3775359A1 EP 19708999 A EP19708999 A EP 19708999A EP 3775359 A1 EP3775359 A1 EP 3775359A1
Authority
EP
European Patent Office
Prior art keywords
pump
detection means
enabling
temperature
laundry dryer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19708999.8A
Other languages
German (de)
French (fr)
Other versions
EP3775359B1 (en
Inventor
Meryem ATILA
Bora Abdik
Ergin Arslan
Dogan Tastan
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.)
Arcelik AS
Original Assignee
Arcelik AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik AS filed Critical Arcelik AS
Publication of EP3775359A1 publication Critical patent/EP3775359A1/en
Application granted granted Critical
Publication of EP3775359B1 publication Critical patent/EP3775359B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/206—Heat pump arrangements

Definitions

  • the present invention relates to a laundry dryer with heat pump.
  • the drying air absorbing the humidity of the laundry items in the drum leaves its humidity in the evaporator and is introduced back in the drum after passing through the condenser.
  • coolant cycle the coolant arrives with increased pressure and heat from the compressor to the condenser, is introduced into the evaporator after being throttled in the capillary tube and draws heat from the drying air in the evaporator in order to dehumidify it. Dehumidification occurs as the drying air reaches a certain temperature at the outlet of the drum, and the drying air cycle is thus completed.
  • a cooling system continuously operates and conditions the same drying air, therefore the heat of the cooling system continually increases.
  • the drying air heated at the condenser side is sent into the drum and the laundry items in the drum are heated by means of this air.
  • the air exiting the drum passes through the evaporator and leaves its humidity.
  • Condensed humidity is pumped to a water collection tank of the dryer by means of a pump.
  • dehumidification of the laundry items and condensation do not begin with the initial activation of a laundry dryer. Dehumidification of the laundry items and condensation occur once the system reaches a stable regime.
  • a pump operates in given periods starting from activation of a laundry dryer, regardless whether there is water in the system.
  • a pumps activation in the beginning of the cycle implies that it operates also when the dehumidification process is not already active. Operating in dry environment causes the pump to have a shorter lifetime and to operate with more noise.
  • the aim of the present invention is to realize a laundry dryer with heat pump in which the useful lifetime of the pump is prolonged and operation noise is mitigated by preventing pump operation in dry environment.
  • the laundry dryer with heat pump realized to achieve the aim of the present invention and disclosed in the first claim and the dependent claims, comprises a drum in which the laundry items desired to be dried are placed, an air circulation line enabling the recirculated air to circulate in a closed cycle, an evaporator enabling dehumidifying the humid process air discharged from the drum, a condenser enabling heating the dehumidified process air, a compressor and an expansion valve enabling coolant flow, and a pump enabling discharging the condensed water.
  • the laundry dryer with heat pump of the invention comprises a first detection means measuring coolant temperature, a second detection means measuring process air temperature, and a control unit controlling operation of the pump according to data received from the first detection means and the second detection means.
  • the temperatures of the coolant and the process air are determined by the control unit, and the control unit controls the state of condensation according to the determined temperature values and activates the pump when condensation occurs.
  • control unit instantaneously controls operation of the pump according to information received from the first detection means and the second detection means.
  • the pump is thus prevented from operating in dry environment, avoiding noisy operation of the laundry dryer.
  • the laundry dryer comprises a control unit comparing the temperature difference between the temperature measured by the first detection means and the temperature measured by the second detection means and activating the pump if the measured temperature difference is higher than a limit temperature value and halting the pump if the measured temperature difference is lower than the limit temperature value. If the instant temperature difference between the temperature measured by the first detection means and the temperature measured by the second detection means is higher than a limit temperature value predetermined by the producer, the control unit determines occurrence of condensation and activates the pump. If the measured temperature difference is lower than the limit temperature value, the control unit enables halting the pump.
  • Figure 1 is a schematic view of a laundry dryer with heat pump.
  • the laundry dryer (1) with heat pump comprises
  • the laundry dryer (1) with heat pump of the invention comprises a first detection means (9) measuring coolant temperature (T1), a second detection means (10) measuring process air temperature (T2), and a control unit (11) controlling operation of the pump (8) according to data received from the first detection means (9) and the second detection means (10).
  • the control unit (11) determines beginning of condensation according to the measured temperature values (T1, T2), activates the pump (8) when condensation occurs and enables discharging the condensed water.
  • control unit (11) instantaneously controls operation of the pump (8) according to information received from the first detection means (9) and the second detection means (10).
  • the pump (8) is thus continually halted when there is no condensation.
  • the laundry dryer (1) comprises a control unit (11) comparing the temperature difference between the temperature (T1) measured by the first detection means (9) and the temperature (T2) measured by the second detection means (10), and activating the pump (8) if the measured temperature difference is higher than a limit temperature value (Tlim) and halting the pump (8) if the measured temperature difference is lower than the limit temperature value (Tlim). If the instant temperature difference between the temperature (T1) measured by the first detection means (9) and the temperature (T2) measured by the second detection means (10) is higher than a limit temperature value (Tlim) predetermined by the producer, the control unit (11) determines occurrence of condensation and activates the pump (8). If the measured temperature difference is lower than the limit temperature value (Tlim), the control unit (11) enables halting the pump (8).
  • the pump (8) is enabled to be activated only when condensation occurs, avoiding redundant operation of the pump (8), and the shortened operation duration of the pump (8) enables prolonging the useful lifetime of the pump (8) and reducing the noise levels of the laundry dryer with heat pump (1).

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

The present invention relates to a laundry dryer with heat pump (1) comprising a drum (2) in which the laundry items desired to be dried are placed, an air circulation line (3) enabling the recirculated air to circulate in a closed cycle, an evaporator (4) enabling dehumidifying the humid process air discharged from the drum (2), a condenser (5) enabling heating the dehumidified process air, a compressor (6) and an expansion valve (7) enabling coolant flow, and a pump (8) enabling discharging the condensed water.

Description

    A LAUNDRY DRYER WITH HEAT PUMP
  • The present invention relates to a laundry dryer with heat pump.
  • In laundry dryers with heat pump, the drying air absorbing the humidity of the laundry items in the drum, leaves its humidity in the evaporator and is introduced back in the drum after passing through the condenser. In coolant cycle, the coolant arrives with increased pressure and heat from the compressor to the condenser, is introduced into the evaporator after being throttled in the capillary tube and draws heat from the drying air in the evaporator in order to dehumidify it. Dehumidification occurs as the drying air reaches a certain temperature at the outlet of the drum, and the drying air cycle is thus completed. Throughout the drying air cycle, a cooling system continuously operates and conditions the same drying air, therefore the heat of the cooling system continually increases. In other words, the drying air heated at the condenser side is sent into the drum and the laundry items in the drum are heated by means of this air. The air exiting the drum passes through the evaporator and leaves its humidity. Condensed humidity is pumped to a water collection tank of the dryer by means of a pump. However, dehumidification of the laundry items and condensation do not begin with the initial activation of a laundry dryer. Dehumidification of the laundry items and condensation occur once the system reaches a stable regime. A pump operates in given periods starting from activation of a laundry dryer, regardless whether there is water in the system. A pumps activation in the beginning of the cycle implies that it operates also when the dehumidification process is not already active. Operating in dry environment causes the pump to have a shorter lifetime and to operate with more noise.
  • The aim of the present invention is to realize a laundry dryer with heat pump in which the useful lifetime of the pump is prolonged and operation noise is mitigated by preventing pump operation in dry environment.
  • The laundry dryer with heat pump realized to achieve the aim of the present invention and disclosed in the first claim and the dependent claims, comprises a drum in which the laundry items desired to be dried are placed, an air circulation line enabling the recirculated air to circulate in a closed cycle, an evaporator enabling dehumidifying the humid process air discharged from the drum, a condenser enabling heating the dehumidified process air, a compressor and an expansion valve enabling coolant flow, and a pump enabling discharging the condensed water.
  • The laundry dryer with heat pump of the invention comprises a first detection means measuring coolant temperature, a second detection means measuring process air temperature, and a control unit controlling operation of the pump according to data received from the first detection means and the second detection means. The temperatures of the coolant and the process air are determined by the control unit, and the control unit controls the state of condensation according to the determined temperature values and activates the pump when condensation occurs.
  • In an embodiment of the invention, the control unit instantaneously controls operation of the pump according to information received from the first detection means and the second detection means. The pump is thus prevented from operating in dry environment, avoiding noisy operation of the laundry dryer.
  • In another embodiment of the invention, the laundry dryer comprises a control unit comparing the temperature difference between the temperature measured by the first detection means and the temperature measured by the second detection means and activating the pump if the measured temperature difference is higher than a limit temperature value and halting the pump if the measured temperature difference is lower than the limit temperature value. If the instant temperature difference between the temperature measured by the first detection means and the temperature measured by the second detection means is higher than a limit temperature value predetermined by the producer, the control unit determines occurrence of condensation and activates the pump. If the measured temperature difference is lower than the limit temperature value, the control unit enables halting the pump.
  • The laundry dryer with heat pump realized to achieve the aims of the present invention is illustrated in the accompanying drawings, wherein:
  • Figure 1 is a schematic view of a laundry dryer with heat pump.
  • The elements in the figures are numbered individually and the correspondence of these numbers are given hereinafter.
    1. Laundry dryer with heat pump
    2. Drum
    3. Air circulation line
    4. Evaporator
    5. Condenser
    6. Compressor
    7. Expansion valve
    8. Pump
    9. First detection means
    10. Second detection means
    11. Control unit
  • The laundry dryer (1) with heat pump comprises
    • a drum (2) in which the laundry items desired to be dried are placed,
    • an air circulation line (3) enabling the recirculated air to circulate in a closed cycle,
    • an evaporator (4) enabling dehumidifying the humid process air discharged from the drum (2),
    • a condenser (5) enabling heating the dehumidified process air,
    • a compressor (6) and an expansion valve (7) enabling coolant flow, and
    • a pump (8) enabling discharging the condensed water (Figure 1).
  • The laundry dryer (1) with heat pump of the invention comprises a first detection means (9) measuring coolant temperature (T1), a second detection means (10) measuring process air temperature (T2), and a control unit (11) controlling operation of the pump (8) according to data received from the first detection means (9) and the second detection means (10). The control unit (11) determines beginning of condensation according to the measured temperature values (T1, T2), activates the pump (8) when condensation occurs and enables discharging the condensed water.
  • In an embodiment of the invention, the control unit (11) instantaneously controls operation of the pump (8) according to information received from the first detection means (9) and the second detection means (10). The pump (8) is thus continually halted when there is no condensation.
  • In another embodiment of the invention, the laundry dryer (1) comprises a control unit (11) comparing the temperature difference between the temperature (T1) measured by the first detection means (9) and the temperature (T2) measured by the second detection means (10), and activating the pump (8) if the measured temperature difference is higher than a limit temperature value (Tlim) and halting the pump (8) if the measured temperature difference is lower than the limit temperature value (Tlim). If the instant temperature difference between the temperature (T1) measured by the first detection means (9) and the temperature (T2) measured by the second detection means (10) is higher than a limit temperature value (Tlim) predetermined by the producer, the control unit (11) determines occurrence of condensation and activates the pump (8). If the measured temperature difference is lower than the limit temperature value (Tlim), the control unit (11) enables halting the pump (8).
  • By means of the invention the pump (8) is enabled to be activated only when condensation occurs, avoiding redundant operation of the pump (8), and the shortened operation duration of the pump (8) enables prolonging the useful lifetime of the pump (8) and reducing the noise levels of the laundry dryer with heat pump (1).

Claims (3)

  1. A laundry dryer (1) with heat pump comprising a drum (2) in which the laundry items desired to be dried are placed, an air circulation line (3) enabling the recirculated air to circulate in a closed cycle, an evaporator (4) enabling dehumidifying the humid process air discharged from the drum (2), a condenser (5) enabling heating the dehumidified process air, a compressor (6) and an expansion valve (7) enabling coolant flow, and a pump (8) enabling discharging the condensed water, characterized by a first detection means (9) measuring coolant temperature (T1), a second detection means (10) measuring process air temperature (T2), and by a control unit (11) controlling operation of the pump (8) according to data received from the first detection means (9) and the second detection means (10).
  2. A laundry dryer (1) with heat pump according to claim 1, characterized by the control unit (11) instantaneously controlling operation of the pump (8) according to information received from the first detection means (9) and the second detection means (10).
  3. A laundry dryer (1) with heat pump according to any one of the preceding claims, characterized by the control unit (11) comparing the temperature difference between the temperature (T1) measured by the first detection means (9) and the temperature (T2) measured by the second detection means (10), and activating the pump (8) if the measured temperature difference is higher than a limit temperature value (Tlim) and halting the pump (8) if the measured temperature difference is lower than the limit temperature value (Tlim).
EP19708999.8A 2018-04-02 2019-02-28 A laundry dryer with heat pump Active EP3775359B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201804587 2018-04-02
PCT/EP2019/054942 WO2019192782A1 (en) 2018-04-02 2019-02-28 A laundry dryer with heat pump

Publications (2)

Publication Number Publication Date
EP3775359A1 true EP3775359A1 (en) 2021-02-17
EP3775359B1 EP3775359B1 (en) 2023-07-12

Family

ID=65685325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19708999.8A Active EP3775359B1 (en) 2018-04-02 2019-02-28 A laundry dryer with heat pump

Country Status (3)

Country Link
EP (1) EP3775359B1 (en)
PL (1) PL3775359T3 (en)
WO (1) WO2019192782A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2341180A1 (en) * 2009-12-29 2011-07-06 Electrolux Home Products Corporation N.V. A heat pump system for a tumble dryer
DE102016202114A1 (en) * 2016-02-12 2017-08-17 BSH Hausgeräte GmbH Home appliance and method for operating a household appliance

Also Published As

Publication number Publication date
EP3775359B1 (en) 2023-07-12
WO2019192782A1 (en) 2019-10-10
PL3775359T3 (en) 2024-01-15

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