US 12,442,574 B2
Vapor compression refrigeration cycle device
Tsuneko Imagawa, Osaka (JP); Yuki Yamaoka, Shiga (JP); and Yasuaki Bando, Shiga (JP)
Assigned to Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Kadoma (JP)
Filed on Oct. 6, 2023, as Appl. No. 18/482,566.
Claims priority of application No. 2022-190326 (JP), filed on Nov. 29, 2022.
Prior Publication US 2024/0175615 A1, May 30, 2024
Int. Cl. F25B 49/02 (2006.01); F25B 1/04 (2006.01)
CPC F25B 49/022 (2013.01) [F25B 1/04 (2013.01); F25B 2400/0409 (2013.01); F25B 2600/0253 (2013.01); F25B 2600/2501 (2013.01); F25B 2600/2513 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A vapor compression refrigeration cycle device comprising:
a main refrigerant circuit formed by sequentially connecting a compressor, a use-side heat exchanger, an intermediate heat exchanger, a first expansion valve and a heat source-side heat exchanger to one another through a refrigerant pipe;
a bypass refrigerant circuit which branches off from the refrigerant pipe located between the use-side heat exchanger and the first expansion valve, and which is formed by sequentially connecting a second expansion valve, the intermediate heat exchanger, and a compression midstream of the compressor to one another; and
a controller configured to control valve opening degrees of the first expansion valve and the second expansion valve; wherein
when a pressure ratio of discharge pressure of refrigerant discharged from the compressor and suction pressure of refrigerant sucked into the compressor is equal to or smaller than a reference pressure ratio, the controller is configured to determine that an injection volume to the compression midstream of the compressor is reduced and to control the compressor such that number of rotations of the compressor is increased.