Patent ID: 6543238
Filing Date: 2003-04-08
Classification: A63B,F04C,F25B

Abstract:
A refrigerant cycle system comprising:a compressor for compressing refrigerant; a radiator for cooling refrigerant discharged from said compressor, said radiator having therein a pressure higher than the critical pressure of refrigerant; an expansion-energy recovering unit for decompressing and expanding refrigerant discharged from said radiator in a refrigerant expansion, and for converting expansion energy during the refrigerant expansion to mechanical energy to supply the mechanical energy to said compressor, said expansion-energy recovering unit being integrated with said compressor such that said expansion-energy recovering unit and said compressor are rotated with the same rotation speed; an evaporator for evaporating refrigerant decompressed in said expansion-energy recovering unit; a control unit for controlling a parameter relative to operation of said expansion-energy recovering unit to control a pressure of high-pressure side refrigerant having been compressed by said compressor and before being decompressed; a pressure detection unit for detecting the pressure of high-pressure side refrigerant; a temperature detection unit for detecting the temperature of the high-pressure side refrigerant; and a control valve disposed at an upstream side of said expansion-energy recovering unit in a refrigerant flow direction to control the pressure of the high-pressure side refrigerant based on the temperature of the high-pressure side refrigerant detected by the temperature detection unit.