Patent ID: 8753098

Claim:
A refrigerant compressor comprising: an electric motor that is constituted by a stator and a rotor that are disposed inside a sealed vessel; a compressing mechanism that is driven by a crank shaft that is fitted into said rotor; a lower portion oil pool that stores in said sealed vessel a lubricating oil that lubricates said compressing mechanism; and an upper counterweight that is disposed on an upper end of said rotor, refrigerant gas that is compressed by said compressing mechanism being discharged inside said sealed vessel, and said discharged refrigerant gas passing through a gas channel that is formed on said electric motor, being moved from a lower space to an upper space with respect to said electric motor, and then being discharged outside said sealed vessel, wherein: an oil return flow channel is formed on said upper end of said rotor toward a lower end in a region in which there is positive pressure compared to operating pressure and in a vicinity of a leading end portion of said upper counterweight in a direction of rotation; and oil that is expressed in a vicinity of said rotor is directed to said oil return flow channel.