Patent ID: 6460371
Filing Date: 2002-10-08
Classification: F04C,F25B

Abstract:
A multistage compression refrigerating machine comprising:an evaporator; a condenser for condensing a refrigerant and supplying the condensed refrigerant to the evaporator via a subcooler; a multistage compression system having a plurality of compressors which are connected in series, for: receiving the refrigerant evaporated in the evaporator; receiving a refrigerant evaporated from the subcooler, from an intermediate position between adjacent compressors in the multistage compression system; and compressing the received refrigerants together and discharging the compressed refrigerant to the condenser; a rotating machine for driving the multistage compression system; a rotating-machine cooler for cooling the rotating machine; and a lubricating-oil cooler for cooling lubricating oil for lubricating the rotating machine, and wherein: the liquid refrigerant extracted from the subcooler is supplied to the rotating-machine cooler and the lubricating-oil cooler, and this refrigerant is returned to the evaporator after cooling.