Patent ID: 6862897

Claim:
A vapor-compression refrigerant cycle comprising: a compressor for discharging a high-pressure refrigerant; a radiator for cooling the high-pressure refrigerant discharged from the compressor; an evaporator for evaporating a low-pressure refrigerant after being decompressed; an ejector including a nozzle for decompressing and expanding the high-pressure refrigerant flowing from the radiator in iso-entropy, and a pressure increasing portion in which a pressure of refrigerant to be sucked into the compressor is increased by converting expansion energy of the refrigerant to pressure energy thereof while the refrigerant discharged from the nozzle and the refrigerant sucked from the evaporator are mixed; and a gas-liquid separator for separating the refrigerant flowing from the ejector into liquid-phase refrigerant and gas-phase refrigerant, the gas-liquid separator including a gas-phase refrigerant outlet connected to a refrigerant suction side of the compressor and a liquid-phase refrigerant outlet connected to a refrigerant inlet side of the evaporator, wherein: the refrigerant is a mixture refrigerant in which a first refrigerant and a second refrigerant are mixed; when the refrigerant is decompressed and expanded in the nozzle, the first refrigerant has an adiabatic heat drop that is larger than an adiabatic heat drop of the second refrigerant; in the evaporator, the second refrigerant has an evaporation latent heat that is larger than an evaporation latent heat of the first refrigerant; and in the gas-liquid separator, a gas-phase amount of the first refrigerant is made larger than a gas-phase amount of the second refrigerant, and a liquid-phase amount of the second refrigerant is made larger than a liquid phase amount of the first refrigerant.