MULTIPLE-STAGE COMPRESSOR

摘要

The amount of lubricating oil to be sucked into a high-stage compression mechanism by being entrained in intermediate-pressure refrigerant gas discharged from a low-stage compression mechanism is reduced to reduce the oil circulation ratio, thereby enhancing system efficiency and eliminating a shortage of lubricating oil. In a multistage compressor in which an electric motor is mounted at substantially the center in a sealed housing, a low-stage compression mechanism and a high-stage compression mechanism which are driven by the electric motor via a rotating shaft are mounted below and above the electric motor, with the electric motor therebetween, and two-stage compression is performed by discharging intermediate-pressure refrigerant gas compressed by the low-stage compression mechanism into the sealed housing and then sucking the intermediate-pressure refrigerant gas into the high-stage compression mechanism, a first oil separation plate that centrifugally separates lubricating oil contained in the intermediate-pressure refrigerant gas that is to be sucked into the high-stage compression mechanism after circulating in the electric motor is provided so as to pass through a bearing that supports one end of the rotating shaft.