US 11,187,447 B2Granted

Refrigeration cycle apparatus

AssigneeMitsubishi Electric Corporation

InventorsTakanori Koike, Osamu Morimoto, Kazuyoshi Shinozaki, Hiroyuki Okano

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Abstract

A refrigeration cycle apparatus includes a refrigerant circuit, through which refrigerant is circulated, including a compressor, a heat source side heat exchanger, a first expansion device, and a load side heat exchanger, a controller controlling the refrigerant circuit, and a bypass pipe that branches off from a high-pressure pipe extending from the compressor to the first expansion device and that is connected to a low-pressure pipe on a suction side of the compressor. The apparatus further includes a precooling heat exchanger that is provided in the bypass pipe and that cools the refrigerant diverted to the bypass pipe, a second expansion device that is provided in the bypass pipe and that reduces a pressure of the refrigerant cooled by the precooling heat exchanger, and a refrigerant cooler that is provided in the bypass pipe and that cools the controller with the refrigerant reduced in pressure by the second expansion device.

Claims11

Dependent claims

A refrigeration cycle apparatus comprising:

a refrigerant circuit configured to circulate refrigerant, the refrigerant circuit including a compressor, a heat source side heat exchanger, a first expansion device, and a load side heat exchanger;
a controller configured to control the refrigerant circuit;
a high-pressure pipe having a first part extending from the compressor to the heat source side heat exchanger and a second part extending from the heat source side heat exchanger to the first expansion device provided;
a low-pressure pipe extending from the load side heat exchanger to a suction side of the compressor;
a bypass pipe having a first end that branches off from the first part of the high-pressure pipe extending from the compressor to the heat source side heat exchanger and a second end that is directly connected to the low-pressure pipe on the suction side of the compressor;
a precooling heat exchanger provided in the bypass pipe and configured to cool the refrigerant diverted to the bypass pipe;
a second expansion device in the bypass pipe and configured to reduce a pressure of the refrigerant cooled by the precooling heat exchanger;
a refrigerant cooler provided in the bypass pipe and configured to cool the controller directly with the refrigerant reduced in pressure by a second expansion device;
a controller temperature sensor configured to detect a temperature of the controller;
and
an outdoor air temperature sensor configured to detect an outdoor air temperature,
wherein
the controller is configured to increase an opening degree of the second expansion device in a case where the temperature detected by the controller temperature sensor is at or above a preset start temperature, and
the controller is configured to reduce the opening degree of the second expansion device in a case where the temperature detected by the controller temperature sensor is at or below the temperature detected by the outdoor air temperature sensor while the second expander is open.

11 more elements

A refrigeration cycle apparatus comprising:

a refrigerant circuit configured to circulate refrigerant, the refrigerant circuit including a compressor, a heat source side heat exchanger, a first expansion device, and a load side heat exchanger;
a controller configured to control the refrigerant circuit;
a bypass pipe that branches off from a high-pressure pipe extending from the compressor to the first expansion device and that is connected to a low-pressure pipe on a suction side of the compressor;
a precooling heat exchanger provided in the bypass pipe and configured to cool the refrigerant diverted to the bypass pipe;
a second expansion device provided in the bypass pipe and configured to reduce a pressure of the refrigerant cooled by the precooling heat exchanger;
and
a refrigerant cooler provided in the bypass pipe and configured to cool the controller with the refrigerant reduced in pressure by the second expansion device,
a controller temperature sensor configured to detect a temperature of the controller, and
an outdoor air temperature sensor configured to detect an outdoor air temperature, wherein the controller is configured to increase an opening degree of the second expansion device in a case where the temperature detected by the controller temperature sensor is at or above a preset start temperature, and
wherein the controller is configured to reduce the opening degree of the second expansion device is where the temperature detected by the controller temperature sensor is at or below the temperature detected by the outdoor air temperature sensor while the second expander is open.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/779,663Filed 27 Jan 2016
Published: US 2018/0328639 A115 Nov 2018
Granted: 30 Nov 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F25B 13/00
Compression machines, plants or systems, with reversible cycle
F25B 30/02
Heat pumps: of the compression type
F25B 49/02
Arrangement or mounting of control or safety devices: for compression type machines, plants or systems
F25B 2313/021
Compression machines, plants or systems with reversible cycle not otherwise provided for: indoor unit or outdoor unit with auxiliary heat…