Patent ID: 7086248

Claim:
An ejector cycle device of vapor compression type for moving heat from a low-temperature side to a high-temperature side, the ejector cycle device comprising: a compressor for sucking refrigeration oil along with a carbon dioxide refrigerant, and compressing the refrigerant; a high-pressure side heat exchanger for radiating heat of a high-pressure refrigerant discharged from the compressor; a low-pressure side heat exchanger for evaporating a low-pressure refrigerant; an ejector having a nozzle for decompressing and expanding the high-pressure refrigerant isentropically, the ejector sucking a gas-phase refrigerant evaporated in the low-pressure side heat exchanger by means of a high-speed refrigerant flow injected from said nozzle and converting expansion energy into pressure energy to increase a suction pressure of the compressor; and a gas-liquid separator for separating a refrigerant flowing out of the ejector into the gas-phase refrigerant and a liquid-phase refrigerant, wherein the gas-liquid separator includes: a gas-phase refrigerant port connected to a suction side of the compressor and a liquid-phase refrigerant port connected to the low-pressure side heat exchanger; a gas-phase refrigerant outlet opening at a gas-phase component area in the gas-liquid separator, the gas-phase refrigerant outlet being in communication with the suction side of said compressor; a liquid-phase refrigerant outlet opening at a liquid-phase component area in the gas-liquid separator, the liquid-phase refrigerant outlet being in communication with a refrigerant-inlet side of the low-pressure side heat exchanger; and an oil outlet opening at a liquid-phase component area of the refrigeration oil in the gas-liquid separator, the oil outlet being in communication with the suction side of the compressor, wherein a refrigeration oil compatibility relative to the refrigerant on the low-pressure side is less than a refrigeration oil compatibility relative to the refrigerant on the high-pressure side.