Clothes treatment apparatus and method of controlling the same

Patent metadata

Field	Value
Publication number	US-10119221-B2
Application number	US-201615072554-A
Country	US
Kind code	B2
Filing date	Mar 17, 2016
Priority date	Mar 17, 2015
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

A clothes treatment apparatus includes a case that defines a treatment chamber that is configured to receive clothes. The clothes treatment apparatus further includes a steam unit that is configured to supply steam to the treatment chamber. The clothes treatment apparatus further includes a blower unit that is configured to draw air from the treatment chamber. The clothes treatment apparatus further includes an inlet temperature sensor that is configured to measure an inlet temperature of air drawn by the blower unit. The clothes treatment apparatus further includes a heat pump unit that is configured to heat air drawn by the blower unit and that is configured to supply heated air to the treatment chamber. The clothes treatment apparatus further includes a control unit that is configured to control the steam unit, the blower unit, and the heat pump unit.

First claim

What is claimed is:

1. A clothes treatment apparatus comprising:
a case that defines a treatment chamber that is configured to receive clothes;
a steam unit that is configured to supply steam to the treatment chamber and that comprises a heater that is configured to heat water;
a blower unit that is configured to draw air from the treatment chamber;
an inlet temperature sensor that is configured to measure an inlet temperature of air drawn from the treatment chamber and by the blower unit;
a heat pump unit that is configured to heat air drawn by the blower unit and that is configured to supply heated air to the treatment chamber; and
a control unit that is configured to:
preheat the heater by supplying power to the heater,
draw air from the treatment chamber without operating the heat pump unit,
at a time that the blower unit begins to operate, determine that a preheated inlet temperature (T 1 ) is the inlet temperature,
after preheating the heater, supply steam to the treatment chamber by operating the steam unit,
after halting operation of the steam unit, lower a temperature inside the treatment chamber by operating the blower unit,
based on the preheated inlet temperature (T 1 ) being equal to or higher than a predetermined reference inlet temperature (T_in), control the heat pump unit to heat air, that is drawn by the blower unit, at a slower rate than based on the preheated inlet temperature (T 1 ) being lower than the reference inlet temperature (T_in), and
discharge heated air into the treatment chamber by operating the blower unit.

2. The clothes treatment apparatus according to claim 1 , wherein the control unit is configured to:
at a time that the control unit operates the heat pump unit, determine that a dried inlet temperature (T 2 ) is the inlet temperature, and
based on comparing the dried inlet temperature (T 2 ) to the preheated inlet temperature (T 1 ), control the heat pump unit.

3. The clothes treatment apparatus according to claim 2 , wherein the control unit is configured to control the heat pump unit by:
based on determining that (i) the preheated inlet temperature (T 1 ) is lower than a predetermined reference inlet temperature (T_in), and (ii) a difference between the dried inlet temperature (T 2 ) and the preheated inlet temperature (T 1 ) is equal to or higher than a predetermined first reference temperature difference (ΔD 1 ), halting operation of the heat pump unit, and
based on determining that (i) the preheated inlet temperature (T 1 ) is equal to or higher than the reference inlet temperature (T_in), and (ii) a difference between the dried inlet temperature (T 2 ) and the preheated inlet temperature (T 1 ) is equal to or higher than a predetermined second temperature difference (ΔD 2 ), halting operation of the heat pump unit,
wherein the second reference temperature difference (ΔD 2 ) is less than the first reference temperature difference (ΔD 1 ).

4. The clothes treatment apparatus according to claim 1 , wherein:
the heat pump unit includes a compressor that is configured to compress refrigerant and a condenser that is configured to exchange heat between the refrigerant compressed by the compressor and the air drawn by the blower unit,
the control unit is configured to operate the compressor at a predetermined first operating speed (V 1 ) based on the preheated inlet temperature (T 1 ) being lower than a predetermined reference inlet temperature (T_in),
the control unit is configured to operate the compressor at a predetermined second operating speed (V 2 ) based on the preheated inlet temperature (T 1 ) being equal to or higher than the reference inlet temperature (T_in), and
the second operating speed (V 2 ) is lower than the first operating speed (V 1 ).

5. The clothes treatment apparatus according to claim 4 , wherein:
the control unit is configured to halt operation of the compressor based on a difference between a dried inlet temperature (T 2 ), that the inlet temperature sensor measures while the compressor operates at the first operating speed (V 1 ), and the preheated inlet temperature (T 1 ) being equal to or higher than a first reference temperature difference (ΔD 1 ),
the control unit is configured to halt operation of the compressor based on the difference between a dried inlet temperature (T 2 ), that the inlet temperature sensor measures while the compressor operates at the second operating speed (V 2 ), and the preheated inlet temperature (T 1 ) being equal to or higher than a second reference temperature difference (ΔD 2 ), and
the second reference temperature difference (ΔD 2 ) is less than the first reference temperature difference (ΔD 1 ).

6. A method of controlling a clothes treatment apparatus that comprises:
a case that defines a treatment chamber that is configured to receive clothes;
a steam unit that is configured to supply steam to the treatment chamber;
a blower unit that is configured to draw air from the treatment chamber;
an inlet temperature sensor that is configured to measure an inlet temperature of air drawn by the blower unit; and
a heat pump unit that is configured to heat air drawn by the blower unit and that is configured to supply heated air to the treatment chamber, the method comprising:
preheating the heater by supplying power to the heater;
drawing air from the treatment chamber without operating the heat pump unit;
at a time that the blower unit begins to operate, determining that a preheated inlet temperature (T 1 ) is the inlet temperature;
after preheating the heater, supplying steam to the treatment chamber by operating the steam unit;
after halting operation of the steam unit, lowering a temperature inside the treatment chamber by operating the blower unit;
based on the preheated inlet temperature (T 1 ) being equal to or higher than a predetermined reference inlet temperature (T_in), controlling the heat pump unit to heat air, that is drawn by the blower unit, at a slower rate than based on the preheated inlet temperature (T 1 ) being lower than the reference inlet temperature (T_in); and
discharging heated air into the treatment chamber by operating the blower unit.

7. The method according to claim 6 , comprising:
at a time that the heat pump unit begins to operate, determining that a dried inlet temperature (T 2 ) is the inlet temperature; and
based on comparing the dried inlet temperature (T 2 ) to the preheated inlet temperature (T 1 ), controlling the heat pump unit.

8. The method according to claim 7 , wherein controlling the heat pump unit comprises:
based on determining that (i) the preheated inlet temperature (T 1 ) is lower than a predetermined reference inlet temperature (T_in), and (ii) a difference between the dried inlet temperature (T 2 ) and the preheated inlet temperature (T 1 ) is equal to or greater than a predetermined first reference temperature difference (ΔD 1 ), halting operation of the heat pump unit, and
based on determining that (i) the preheated inlet temperature (T 1 ) is equal to or higher than the predetermined reference inlet temperature (T_in), and (ii) a difference between the dried inlet temperature (T 2 ) and the preheated inlet temperature (T 1 ) is equal to or greater than a predetermined second reference temperature difference (ΔD 2 ), halting operation of the heat pump unit,
wherein the second reference temperature difference (ΔD 2 ) is less than the first reference temperature difference (ΔD 1 ).

9. The method according to claim 6 , wherein:
the heat pump unit includes a compressor that is configured to compress refrigerant and a condenser that is configured to exchange heat between the refrigerant compressed by the compressor and the air drawn by the blo

Assignees

• Lg Electronics Inc

Inventors

• Nam Wansik
• Doh Youngjin
• Choi Junyoung

Classifications

• D06F2103/08

  Humidity · CPC title

• D06F2103/50

  related to heat pumps, e.g. pressure or flow rate · CPC title

• D06F58/38

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

• D06F2105/26

  Heat pumps · CPC title

• D06F2058/2829

  Textiles & Paper · mapped topic