Patent ID: 6877339

Claim:
An ejector cycle comprising: a compressor for compressing refrigerant; a high-pressure heat exchanger for cooling high-pressure refrigerant discharged from the compressor; a low-pressure heat exchanger for evaporating low-pressure refrigerant after being decompressed; a variable throttle device disposed at a refrigerant outlet side of the high-pressure heat exchanger; an ejector including a nozzle for decompressing and expanding refrigerant flowing from the variable throttle device 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 jetted 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, wherein the variable throttle device includes a back pressure chamber having an inner pressure that changes by sensing a refrigerant temperature at a refrigerant outlet side of the low-pressure heat exchanger, and a pressure introducing means for introducing a refrigerant pressure at the refrigerant outlet side of the low-pressure heat exchanger to a side opposite to the back pressure chamber.