Patent ID: 8992188
Filing Date: 2015-03-31
Classification: F04C

Abstract:
1. A revolution type compressor configured to compress a refrigerant comprising: a compressing mechanism configured to compress the refrigerant; a drive shaft configured to drive the compressing mechanism; an electric motor configured to rotate the drive shaft; a hermetically sealed container configured to contain the compressing mechanism, the drive shaft and the electric motor; and a balance weight disposed on the drive shaft to be balanced in rotating mass with the compressing mechanism, the electric motor including a stator fixed to the container and a rotor connected to the drive shaft; wherein the balance weight includes a magnetic material, and: wherein each of the weight portion and the cover portion is disposed to be axially distant from the rotor such that the entirety of an axial end surface of the balance weight that axially faces the rotor is disposed to be distant from the rotor, such that an axial clearance is formed at least partially between the rotor and the axial end surface of the balance weight that axially faces the rotor; and wherein the hollow space opens to the axial clearance, and the axial clearance extends radially outward to an outer periphery of at least one of the balance weight and the rotor to open to a space in the hermetically sealed container at the outer periphery, wherein the compressor further comprises: a positioning member disposed in the axial clearance and prevented from extending to close the opening at the lower area of the cover portion.