Patent ID: 6871506

Claim:
An ejector 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 the 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 variable throttle disposed in a refrigerant passage between the high-pressure heat exchanger and the ejector, wherein the variable throttle has a throttle opening degree that is variable such that a refrigerant super-heating degree at a refrigerant outlet side of the low-pressure heat exchanger becomes in a predetermined range; wherein the variable throttle is disposed to decompress high-pressure refrigerant from the high-pressure heat exchanger, to a gas-liquid two-phase mixture; and the nozzle of the ejector further decompresses the gas-liquid two-phase mixture in iso-enthalpy.