Patent ID: 8047018

Claim:
An ejector cycle system with a refrigerant cycle through which refrigerant flows, comprising: a compressor configured to draw and compress refrigerant; a radiator located to radiate heat from high-pressure refrigerant discharged from the compressor; an ejector disposed downstream of the radiator, the ejector having a nozzle portion for depressurizing and expanding refrigerant, a refrigerant suction port through which refrigerant is drawn by a high-speed refrigerant flow jetted from the nozzle portion, and a pressure increasing portion for mixing refrigerant drawn through the refrigerant suction port with the high-speed refrigerant flow and for decelerating the mixed refrigerant flow to raise a pressure of the refrigerant flow; a first evaporator located to evaporate the refrigerant flowing out of the ejector; a branch passage that is branched from a branch portion between the radiator and the nozzle portion of the ejector and is coupled to the refrigerant suction port, for guiding the refrigerant flowing out of the radiator into the refrigerant suction port; a throttling unit that is located in the branch passage and depressurizes refrigerant to adjust a flow amount of refrigerant; a second evaporator that is located downstream of the throttling unit to evaporate refrigerant; and a variable throttling device located in a refrigerant passage between a refrigerant outlet side of the radiator and the branch portion, the variable throttling device decompressing the refrigerant flowing out of the radiator, wherein the variable throttling device is configured to adjust an opening degree of a valve body portion, based on at least one of a superheat degree of refrigerant at a refrigerant outlet side of the first evaporator, a superheat degree of refrigerant at a refrigerant outlet side of the second evaporator, a supercool degree of refrigerant at the refrigerant outlet side of the radiator, a temperature and a pressure of refrigerant at the refrigerant outlet side of the radiator, a flow amount of refrigerant discharged from the compressor, a temperature of a space to be cooled by the first evaporator and the second evaporator, and an ambient temperature of the space to be cooled, and the variable throttling device adjusts a flow ratio between the refrigerant that passes through the nozzle portion of the ejector and the refrigerant drawn through the refrigerant suction port.