Patent ID: 6945074

Claim:
A vapor-compression refrigerant cycle system comprising: a compressor for drawing and compressing refrigerant; an exterior heat exchanger disposed outside a compartment to perform heat exchange between refrigerant and air outside the compartment; an interior heat exchanger disposed inside the compartment to perform heat exchange between refrigerant and air to be blown into the compartment; first switching means disposed to switch one of a first mode where refrigerant discharged from the compressor is supplied to the exterior heat exchanger and a second mode where the refrigerant discharged from the compressor is supplied to the interior heat exchanger; a pressure control device which controls a pressure of the refrigerant discharged from the compressor to be higher than a predetermined pressure when the second mode is set by the switching means; an ejector which includes a nozzle for decompressing and expanding refrigerant, and a pressure-increasing portion which draws gas refrigerant evarporated at a low-pressure side by a refrigerant stream jetted from the nozzle and increases a refrigerant pressure to be sucked to the compressor by converting expansion energy to pressure energy; and a gas-liquid separator for separating refriaerant flowing from the ejector into gas refrigerant and liquid refrigerant, the gas-liquid separator having a gas refrigerant outlet coupled to the compressor and a liquid refrigerant outlet coupled to the low-pressure side, wherein: the nozzle decompresses the refrigerant flowing from the exterior heat exchanger when the first mode is set by the switching means; and the pressure control device is a throttle device which controls the pressure of the refrigerant discharged from the compressor and decompresses the refrigerant flowing from the interior heat exchanger when the second mode is set by the switching means.