| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigeration device capable of securing stable refrigeration capacity when a high pressure side becomes supercritical pressure.SOLUTION: A refrigeration device includes: an electric expansion valve 33 connected to a downstream side of a gas cooler 28 and an upstream side of an electric expansion valve 39; a liquid receiver 36 connected to the downstream side of the electric expansion valve 33 and the upstream side of the electric expansion valve 39; a heat exchanger 29 provided on the downstream side of the gas cooler and the upstream side of the electric expansion valve 33; an auxiliary circuit 48 which flows a refrigerant in the liquid receiver in a first flow passage 29A via electric expansion valves 43, 47 and then returns it to a compressor 11; a main circuit 38 which flows the refrigerant flowed out of the gas cooler into a second flow passage 29B, allows it to exchange heat with the refrigerant flowing in the first flow passage, and then, flows it into the electric expansion valve 33, flows out the refrigerant from a lower part of the liquid receiver, and flows it into the electric expansion valve 39; and solenoid valves 66, 67 which switch selectively between returning the refrigerant flowed out of the first flow passage to an intermediate pressure part of the compressor and returning it to a low pressure part. |
