Washing drying machine having heat pump and drying operation control method thereof

Patent metadata

Field	Value
Publication number	US-10584440-B2
Application number	US-201715646899-A
Country	US
Kind code	B2
Filing date	Jul 11, 2017
Priority date	Jul 29, 2016
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

Provided are a washing drying machine having a heat pump, and a drying operation control method thereof. The washing drying machine having a heat pump includes a cabinet; a tub provided in the cabinet; a drum rotatably provided in the tub; a circulation passage configured to connect a first portion of the tub to a second portion of the tub; a circulation fan provided at the circulation passage and configured to circulate air through the circulation passage and the tub; the heat pump having a compressor that compresses a refrigerant and a heat exchanger that exchanges heat with the air of the circulation passage and the refrigerant; a heater configured to heat an inside of the tub; and a controller configured to control the heater to be supplied with power in order to heat the inside of the tub before the compressor is operated during a drying course.

First claim

What is claimed is:

1. A laundry machine having a heat pump, comprising:
a cabinet;
a tub provided in the cabinet;
a drum rotatably provided in the tub;
a circulation passage configured to connect a first portion of the tub to a second portion of the tub;
a circulation fan provided at the circulation passage and configured to circulate air through the circulation passage and the tub;
the heat pump having a compressor that compresses a refrigerant and a heat exchanger that exchanges heat with the air of the circulation passage and the refrigerant;
a heater configured to heat water inside the tub;
a steam generator configured to generate steam and provide the steam to an inside of the tub;
a controller configured to control the steam generator such that steam is supplied to the inside of the tub before the compressor is operated during a drying course, and
an air temperature sensor that senses an air temperature inside the tub or the circulation passage,
wherein after the steam generator is operated, when an air temperature sensed by the air temperature sensor reaches a predetermined air temperature or if an elapsed time reaches a predetermined time, the controller is configured to operate the circulation fan.

2. The laundry machine having a heat pump of claim 1 , wherein the controller controls the compressor to be driven after the circulation fan is operated.

3. The laundry machine having a heat pump of claim 1 , wherein when the air temperature inside the tub or the circulation passage reaches a predetermined target air temperature, or if the elapsed time reaches a predetermined target time, the controller controls the steam generator to be stopped.

4. The laundry machine having a heat pump of claim 1 , wherein when the air temperature sensed by the air temperature sensor reaches the predetermined target air temperature, or if the elapsed time reaches a predetermined target time, the controller controls the steam generator to be stopped.

5. The laundry machine having a heat pump of claim 4 , wherein when the steam generator is stopped, the controller controls the circulation fan and the compressor such that the circulation fan is driven first and then the compressor is driven.

6. The laundry machine having a heat pump of claim 1 , wherein if the air temperature sensed by the air temperature sensor reaches the predetermined air temperature, or if the elapsed time reaches the predetermined time, after the steam generator is operated, the controller controls the compressor to be driven.

7. The laundry machine having a heat pump of claim 6 , wherein if the air temperature sensed by the air temperature sensor reaches a predetermined target air temperature, or if the elapsed time reaches a predetermined target time, the controller controls the steam generator to be stopped.

Assignees

• Lg Electronics Inc

Inventors

• Kim Changoh
• Han Injae

Classifications

• D06F58/26

  Heating arrangements, e.g. gas heating equipment (D06F58/18 takes precedence) · CPC title

• D06F2105/28

  Electric heating · CPC title

• D06F58/38

  of drying, e.g. to achieve the target humidity · CPC title

• D06F2105/26

  Heat pumps · CPC title

• D06F2105/24

  Flow or velocity · CPC title