Patent ID: 6837069

Claim:
A refrigerant cycle comprising: a compressor for compressing refrigerant; a high-pressure heat exchanger for radiating heat of high-pressure refrigerant discharged from the compressor; a low-pressure heat exchanger for evaporating low-pressure refrigerant after being decompressed; an ejector including a nozzle for decompressing and expanding refrigerant flowing from the high-pressure heat exchanger by converting pressure energy of refrigerant to speed energy of the refrigerant, and a pressure-increasing portion that is disposed to increase a pressure of refrigerant by converting the speed energy of refrigerant to the pressure energy of refrigerant while mixing refrigerant injected from the nozzle and refrigerant sucked from the low-pressure heat exchanger; and a gas-liquid separator for separating refrigerant from the ejector into gas refrigerant and liquid refrigerant, the gas-liquid separator having a gas refrigerant outlet coupled to a refrigerant suction side of the compressor, and a liquid refrigerant outlet coupled to a refrigerant inlet side of the low-pressure heat exchanger; and a control valve disposed in a bypass passage through which a part of refrigerant from the high-pressure heat exchanger flows into a low-pressure refrigerant passage between the low-pressure heat exchanger and a suction port of the ejector, wherein the control valve opens the bypass passage so that refrigerant flows through the bypass passage when a pressure of the refrigerant from the high-pressure heat exchanger becomes in a predetermined condition.