Patent ID: 6868679

Claim:
An ejector cycle system comprising: a compressor for sucking and compressing refrigerant; an exterior heat exchanger that performs heat exchange between refrigerant and outside air of a compartment; an interior heat exchanger that performs heat exchange between refrigerant and air to be blown into the compartment; an ejector including a nozzle for decompressing and expanding refrigerant at a high pressure side, the ejector being provided to suck evaporated refrigerant at a low pressure side from a low-pressure suction port by a high speed stream of refrigerant jetted from the nozzle, and to increase pressure of refrigerant to be sucked into the compressor by converting expansion energy to pressure energy; a gas-liquid separator for separating refrigerant flowing out of the ejector into gas refrigerant and liquid refrigerant, the gas-liquid separator having a gas refrigerant outlet from which the gas refrigerant is supplied to the compressor and a liquid refrigerant outlet from which the liquid refrigerant is supplied to the low pressure side; a bypass means through which refrigerant discharged from the compressor is decompressed and introduced to the interior heat exchanger while bypassing the exterior heat exchanger and the ejector; and a switching device for switching one of a cooling mode where refrigerant discharged from the compressor is supplied to the exterior heat exchanger, and a hot gas heating mode where the refrigerant discharged from the compressor is supplied to the interior heat exchanger through the bypass means, wherein the interior heat exchanger is coupled to the ejector such that refrigerant flowing out of the interior heat exchanger is introduced into at least a refrigerant inlet of the nozzle in the hot gas heating mode.