Patent ID: 7472562
Filing Date: 2009-01-06
Classification: F04C

Abstract:
1. A compressor, comprising: a compression mechanism that draws, compresses and discharges refrigerant; a reservoir configured to store liquid which lubricates the compression mechanism; a housing that contains the compression mechanism and the reservoir; and a refrigerant go-around passage which introduces the refrigerant discharged from the compression mechanism into the housing via a refrigerant introducing port, the refrigerant go-around passage being spaced from and surrounding a structure which surrounds an axial line of the compressor, the refrigerant go-around passage comprising larger curved portions, smaller curved portions, and approximately straight portions, the larger curved portions having a radius of curvature which is larger than a radius of curvature of the smaller curved portions, the curvature of the large curved portions are concentric with the axial line of the compressor, the smaller curved portions and the approximately straight portions are alternatingly connected to each other along a path defined by the refrigerant go-around passage, both the smaller curved portions and the approximately straight portions provided between the large curved portions along the path defined by the refrigerant go-around passage, the refrigerant being directed around the axial line of the compressor and returned to a discharge-port side of the housing via a refrigerant returning port, while separating the liquid from the refrigerant by centrifugation or by centrifugation and collision, wherein a liquid returning port is provided to return the separated liquid into the housing in a wall of a mid part of the refrigerant go-around passage in such a manner that the liquid returning port has an orientation that has a component in a direction of gravity and that is deviated from a traveling direction of the refrigerant.