| 摘要 |
PURPOSE: A multistage compression-refrigerating machine is provided to improve refrigerating performance with efficiently cooling a rotating machine such as an electric motor and lubricating oil by using a refrigerant and increasing the amount of refrigerant to be used to provide the refrigerating capacity an evaporator. CONSTITUTION: A multistage compression refrigerating machine comprises an evaporator(1); a condenser(5) for condensing a refrigerant and supplying the condensed refrigerant to the evaporator via an intercooler(6); a multistage compression system having a plurality of compressors connected in series, for absorbing the refrigerant evaporated in the evaporator, absorbing a refrigerant evaporated from the intercooler, from an intermediate position between adjacent compressors in the multistage compression system, and compressing the absorbed 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(8) for cooling lubricating oil for lubricating the rotating machine. The refrigerant extracted from the intercooler is supplied to the rotating-machine cooler and the lubricating-oil cooler, and the refrigerant is returned to the evaporator after cooling. |
