Air conditioning system and control method therefor

Patent metadata

Field	Value
Publication number	US-2021010733-A1
Application number	US-201916955704-A
Country	US
Kind code	A1
Filing date	Sep 25, 2019
Priority date	Sep 25, 2018
Publication date	Jan 14, 2021
Grant date	—

Abstract

The present application discloses an air conditioning system and a control method therefore. An intermediate heat exchanger can include a first heat exchange portion and a second heat exchange portion, a first end of the first heat exchange portion is in communication with an inlet of a compressor, a second end of the first heat exchange portion is communicable with an outlet of a second heat exchanger and/or a second end of the first heat exchanger, a first end of the second heat exchange portion is communicable with a first end of the first heat exchanger, and a second end of the second heat exchange portion is communicable with an inlet of the second heat exchanger and/or an outlet of the compressor. In the refrigeration mode, the first branch can have an adjustable amount of flow. Performance of the air conditioning system can be enhanced.

First claim

1 . An air conditioning system, comprising:
a compressor, a first heat exchanger, a second heat exchanger, an intermediate heat exchanger, a first branch, and a first throttle element disposed at an inlet of the second heat exchanger; wherein the intermediate heat exchanger comprises a first heat exchange portion and a second heat exchange portion, the first heat exchange portion and the second heat exchange portion are capable of heat exchanging, a first end of the first heat exchange portion is in communication with an inlet of the compressor, a second end of the first heat exchange portion is communicable with at least one of an outlet of the second heat exchanger or a second end of the first heat exchanger, a first end of the second heat exchange portion is communicable with a first end of the first heat exchanger, and a second end of the second heat exchange portion is communicable with at least one of the inlet of the second heat exchanger or an outlet of the compressor; and the air conditioning system is configured to operate in a refrigeration mode, in which an amount of flow in the first branch is adjustable, and the first branch is configured to: 1) be arranged between the first end of the first heat exchanger and the first throttle element, and the first branch is provided with a first valve, the first valve is configured with an adjustable opening degree, such that at least a part of refrigerant flowing out of the first end of the first heat exchanger passes through the first valve, then passes through the first throttle element, and flows into the second heat exchanger; 2) be arranged between the first end of the first heat exchange portion and the first end of the second heat exchange portion, or the first branch is arranged between the first end of the first heat exchange portion and the second end of the second heat exchange portion, and the first branch is provided with a second throttle element, the second throttle element is configured with an adjustable opening degree, such that at least a part of the refrigerant flowing out of the first end of the first heat exchanger is throttled through the second throttle element and then flows into the compressor; or 3) the first branch is be arranged between the first end and the second end of the first heat exchange portion, and the first branch is provided with a third valve, the third valve is configured with an adjustable opening degree, such that at least a part of refrigerant flowing out of the second heat exchanger flows into the compressor via the first branch.

2 . The air conditioning system according to claim 1 , wherein the first branch is provided with the third valve, and the air conditioning system further comprises an accumulator; and
the second end of the first heat exchange portion is communicable with the accumulator; wherein the accumulator comprises a first port, a second port, and a third port close to or located at a bottom of the accumulator, the first port of the accumulator is in communication with the second end of the first heat exchange portion, and the second port of the accumulator is communicable with at least one of the outlet of the second heat exchanger or the second end of the first heat exchanger; and the third valve comprises a first port and a second port, the first port of the third valve is in communication with the second port of the accumulator, and the second port of the third valve is in communication with the inlet of the compressor.

3 . The air conditioning system according to claim 2 , wherein the third valve further comprises a third port, and the third port is in communication with the first end of the first heat exchange portion.

4 . The air conditioning system according to claim 1 , wherein the first branch is provided with the first valve, and a second branch is provided between the second end of the second heat exchange portion and the throttle element, and the second branch is provided with a second valve; and
the air conditioning system further is configured to operate in a heating mode, in which the first valve is at least partially opened, and the second valve is closed.

5 . The air conditioning system according to claim 4 , wherein a first flow regulating device is provided between the first end of the first heat exchanger and the first valve, and the first flow regulating device comprises a valve unit and a throttle unit,
in the refrigeration mode, the valve unit is turned on, the throttle unit is turned off; and in the heating mode, the throttle unit is turned on, and the valve unit is at least partially turned off.

6 . The air conditioning system according to claim 5 , wherein the air conditioning system further is configured to operate in a first dehumidification mode and further comprises a third heat exchanger, wherein in the first dehumidification mode, the outlet of the compressor is in communication with an inlet of the third heat exchanger, refrigerant flowing through the third heat exchanger is capable of releasing heat at the third heat exchanger, an outlet of the third heat exchanger is in communication with the first throttle element, and refrigerant flowing through the second heat exchanger is capable of absorbing heat at the second heat exchanger.

7 . The air conditioning system according to claim 6 , wherein the air conditioning system further is configured to operate in a second dehumidification mode, wherein in the second dehumidification mode, the outlet of the compressor is in communication with the inlet of the third heat exchanger, the refrigerant flowing through the third heat exchanger is capable of releasing heat at the third heat exchanger, the second valve is closed, the first valve is opened, the throttle unit is turned on, and the valve unit is at least partially turned off, such that the outlet of the third heat exchanger is in communication with the first end of the first heat exchanger, refrigerant flowing through the first heat exchanger is capable of absorbing heat at the first heat exchanger, and the second end of the first heat exchanger is in communication with the second end of the first heat exchange portion; and
the outlet of the third heat exchanger is in communication with the first throttle element, the first throttle element is turned on, and the refrigerant flowing through the second heat exchanger is capable of absorbing heat at the second heat exchanger.

8 . The air conditioning system according to claim 6 , wherein the air conditioning system further is configured to operate in a defrost mode, wherein in the defrost mode, the outlet of the compressor is in communication with the inlet of the third heat exchanger, the first valve is at least partially opened, and the first throttle element is turned on, such that the first end of the first heat exchanger is in communication with the inlet of the second heat exchanger, the throttle unit is turned off, and the second valve is closed.

9 . The air conditioning system according to claim 1 , wherein the air conditioning system further comprises a third heat exchanger, an inlet of the third heat exchanger is in communication with the outlet of the compressor, and an outlet of the third heat exchanger is communicable with the second end of the first heat exchanger or the second end of the second heat exchange portion.

10 . The air conditioning system according to claim 9 , wherein a three-way valve is provided on a pipeline between the outlet of the compressor and the inlet of the third heat exchanger, and the three-way valve comprises a first port, a second port and a third port, wherein the first port of the three-way valve is in communication with the outlet of the compressor, the second port of the thr

Assignees

• Hangzhou Sanhua Res Inst Co Ltd

Inventors

• Liu Qiaofeng
• Dong Junqi
• Jia Shiwei

Classifications

• B60H2001/3291

  Locations with heat exchange within the refrigerant circuit itself · CPC title

• F25B2600/2501

  Bypass valves · CPC title

• F25B2400/0419

  for superheaters · CPC title

• F25B49/02 Primary

  for compression type machines, plants or systems · CPC title

• F25B41/20

  Disposition of valves, e.g. of on-off valves or flow control valves (expansion valves F25B41/31) · CPC title