CLOSED MOTOR-DRIVEN COMPRESSOR

摘要

A closed type electric compressor (10) arranges and receives a motor element (14) and a rotary compression element (18) driven by a rotary shaft (16) connected to the motor element (14) within a closed container storing a lubricating oil in a bottom portion thereof with having a CO2 as a refrigerant, and supplies the lubricating oil to a bearing portion and respective sliding portions of upper and lower eccentric portions (38, 40) and upper and lower rollers (42, 44) provided in the rotary shaft (16) via an oil hole (60), oil supply holes (62, 64) and spiral oil supply grooves (66, 68) formed in the rotary shaft (16). A polyalkylene glycol group oil (PAG oil) (82) having a low anti CO2 solubility and a high viscosity is used as the lubricating oil. The PAG oil has the low anti CO2 solubility and can restrict a reduction of efficiency due to a reduction of an oil viscosity and an oil outflow into a pipe, so that it is possible to prevent an input from being increased. IMAGE