Revolution type compressor

摘要

In a revolution type compressor using a balance weight for balancing a rotating mass, the effect of oil churn reduction is enhanced, and compressor input is reduced. A balance weight fixed to a drive shaft between a rotor of an electric motor 4 and a compression mechanism includes a weight portion in a substantially semicircular column shape for balancing a rotating mass, a cover portion which is substantially semi-cylindrical and has an opening in the vicinity of a top and bottom at an opposite side in a radial direction from the weight portion, and a hollow space surrounded by the weight portion and the cover portion. Further, a space for discharging oil is provided between the balance weight and the rotor. By the structure, reduction in oil churn, and reduction in input of the compressor are realized, and the compressor with less power consumption is obtained.

主权项

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:
a weight portion of semicircular column shape, for balancing the balance weight and the compressing mechanism in rotating mass with each other,a cover portion of semi-cylindrical shape, disposed opposite radially to the weight portion and including openings disposed at lower and upper areas respectively, wherein an outer diameter of the cover portion is substantially the same as an outer diameter of the weight portion, anda hollow space, surrounded by the weight portion and the cover portion; 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.