COMPRESSOR

摘要

A lower balance weight is formed of a thick disk plate having the same outer diameter as that of a rotor. A semicircular recess is provided in an upper end surface of the lower balance weight such that a surface of the rotor which comes into contact with a lower end surface remains. The lower balance weight is provided at its central portion with a through hole through which a shaft can be inserted. A lower end surface of the lower balance weight is provided with a countersunk hole in which a lower end of a rivet is accommodated. By using this structure, since a lower end surface and a side surface of the lower balance weight do not have asperities which stir the main flow of working fluid, stirring of the working fluid flowing caused by rotation of the rotor in the lower space is suppressed, oil drops mixed in the working fluid are prevented from being finely divided by the stirring of the oil drops, the oil drops fall downward due to gravity in the lower space, and the oil separation from the working fluid is promoted.