SCROLL TYPE COMPRESSOR

摘要

SCROLL TYPE COMPRESSOR This invention discloses a lubricating mechanism of a hermetically sealed scroll type compressor in which an inner chamber of a housing is kept at suction pressure. The compressor includes a drive shaft supported by a first plain bearing in an inner block member. The drive shaft is operatively linked to an orbiting scroll which orbits within a stationary scroll. A rotation preventing device prevents rotation of the orbiting scroll. The drive shaft includes an axial bore extending from an open end and terminating within the inner block member. A pin extends from the end of the drive shaft to the orbital scroll and is supported in a bushing within an extension of the orbiting scroll. A second plain bearing supports the bushing. A passage links the axial bore to an opening at the end of the pin facing the orbital scroll. A radial bore is provided near the terminal end of the axial bore to link the axial bore to a suction chamber of the compressor. A first helical groove is formed in the exterior surface of the supported portion of the drive shaft. The first helical groove is linked to the axial bore through a radial hole formed through the supported portion of the drive shaft. A second helical groove is formed in the exterior surface of the bushing. Fluid flows through the radial bore and through the narrow passage to lubricate the rotation preventing device. Fluid flows through the first helical groove to lubricate the friction surface between the drive shaft and the first plain bearing. Fluid flow through the second helical groove to lubricate the surface between the bushing and the second plain bearing.