Method for treating clothes in a dryer

Patent metadata

Field	Value
Publication number	US-9605375-B2
Application number	US-201514641941-A
Country	US
Kind code	B2
Filing date	Mar 9, 2015
Priority date	Mar 14, 2014
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A method for treating clothes in a dryer, particularly for removing wrinkles from clothes at the end of a clothes drying program or a clothes refreshing program, in which the flow rate of process air circulated in a closed loop is decreased by reversing the rotation of the fan.

First claim

What is claimed is:

1. A method for treating clothes in a heat-pump dryer comprising a condenser, heater, fan and a drum, fluidly coupled by a conduit, the method comprising:
operating the fan in a first direction to recirculate air through the conduit over the heater and condenser at a first flow rate; and
reversing the rotation of the fan by operating the fan in a second direction, opposite the first direction, to recirculate air through the conduit at a second flow rate, which is less than the first flow rate, to decrease the flow rate of airflow recirculated through the conduit.

2. The method according to claim 1 , in which the airflow is passing through a condenser and a heater.

3. The method according to claim 2 wherein before the reversing the rotation of the fan, switching off the heater.

4. The method according to claim 3 wherein the heater is switched off for a predetermined period of time corresponding to the period during which the fan is rotated in the second direction.

5. The method according to claim 2 , further comprising adding a predetermined amount of water in the condenser.

6. The method according to claim 1 , wherein the second air flow rate is within one half and one quarter of the first air flow rate.

7. The method according to claim 6 , wherein water is added depending on humidity value of the flowing air.

8. A method for treating clothes in a heat-pump dryer comprising a condenser, heater, fan and a drum, fluidly coupled by a conduit, the method comprising:
during a drying phase, operating the fan in a first direction to recirculate air heated by the heater through the conduit at a first flow rate; and
during a humidification phase, after the drying phase, reversing the rotation of the fan by operating the fan in a second direction, opposite the first direction, to recirculate air through the conduit at a second flow rate, which is less than the first flow rate, to decrease the flow rate of airflow through the conduit.

9. The method according to claim 8 , in which the airflow is passing through a condenser and a heater.

10. The method according to claim 9 , wherein before the reversing the rotation of the fan, switching off the heater.

11. The method according to claim 10 , wherein the heater is switched off for a predetermined period of time corresponding to the period during which the fan is rotated in the second direction.

12. The method according to claim 9 , further comprising adding a predetermined amount of water in the condenser.

13. The method according to claim 12 , wherein water is added depending on humidity value of the flowing air.

14. The method according to claim 8 , wherein the second air flow rate is within one half and one quarter of the first air flow rate.

15. The method according to claim 8 , wherein the humidification phase comprises recirculating air through the drum.

16. The method according to claim 8 , wherein the humidification phase is part of a de-wrinkling phase.

17. The method according to claim 16 , wherein the humidification phase comprises transporting moisture deposited in the conduit during the drying phase into the drum.

18. A heat-pump dryer comprising:
a rotating drum;
a closed air conduit system including the drum;
a condenser provided within the closed air conduit system;
a heater provided within the closed air conduit system;
a fan fluidly coupled to and circulating air in the air conduit system; and
a control unit operably coupled to and controlling the rotating of the drum, actuation of the heater and actuation of the fan according to a predetermined program, wherein the control unit is adapted to decrease the flow of air in the air conduit system and supply moisture to the drum by reversing the rotation of the fan at the end of a drying program or at the end of a clothes refreshing program.

19. The heat-pump dryer according to claim 18 , further comprising a user interface connected to the control unit wherein the user can select a function for removing wrinkles, the reverse rotation of the fan being carried out only when said function is selected.

20. The heat-pump dryer according to claim 19 , further comprising a water pump feeding a predetermined amount of water on the condenser.

21. The heat-pump dryer according to claim 20 , further comprising a water distributor having a plurality of holes and is in flow communication with the water pump.

22. The heat-pump dryer according to claim 21 , wherein the water distributor is a flat container.

23. The heat-pump dryer according to claim 22 , wherein the condenser and the heater are, respectively, an evaporator and the condenser of a heat pump system.

24. The heat-pump dryer according to claim 23 , wherein the fan is a centrifugal fan.

Assignees

• Whirlpool Co

Inventors

• Frank Michael
• Haselmeier Ralf
• Schuler Claudia

Classifications

• D06F2105/24

  Flow or velocity · CPC title

• D06F2103/34

  Humidity · CPC title

• D06F2103/36

  Flow or velocity · CPC title

• D06F2105/28

  Electric heating · CPC title

• D06F2105/46

  Drum speed; Actuation of motors, e.g. starting or interrupting · CPC title