Patent ID: 7059150
Filing Date: 2006-06-13
Classification: B60H,F25B

Abstract:
1. A vapor-compression refrigerant cycle system comprising a compressor which compresses refrigerant; a refrigerant radiator for cooling high-pressure refrigerant discharged from the compressor; an ejector which includes a nozzle for decompressing and expanding refrigerant from the refrigerant radiator, a refrigerant suction port from which gas refrigerant is drawn by a refrigerant steam jetted from the nozzle, and a pressure-increasing portion in which the refrigerant jetted from the nozzle and the gas refrigerant drawn from the refrigerant suction port are mixed and pressure of the refrigerant is increased by converting the speed energy to pressure energy; a first evaporator for evaporating refrigerant flowing out of the pressure-increasing portion of the ejector, the first evaporator being located at a downstream side of the ejector and having a refrigerant outlet coupled to a suction side of the compressor; a second evaporator for evaporating refrigerant to be drawn into the refrigerant suction port; a valve member for opening and closing a refrigerant passage of the second evaporator, the valve member being arranged in serious with the second evaporator in a refrigerant flow; a refrigerant suction pipe having a first end connected to a refrigerant outlet of the second evaporator and a second end connected to the refrigerant suction port; and means for restricting lubrication oil contained in refrigerant from being introduced into and staying in the refrigerant suction pipe through the refrigerant suction port when the valve member is closed.