Patent ID: 8348632
Filing Date: 2013-01-08
Classification: F04B

Abstract:
1. A compressor apparatus comprising: a compressor casing comprising a front housing, a middle housing, and a rear housing, the rear housing defining a suction chamber; a compressor shaft defining a longitudinal hole, the longitudinal hole being open at a first shaft end, which is secured in the front housing, and extending toward a second shaft end, which is secured in the middle housing, the longitudinal hole at the second shaft end defining an outlet always open directly to the suction chamber; a drive plate mounted to the compressor shaft; and a drive arm protruding from the drive plate; wherein the drive arm further defines an internal bore with a first bore end and a second bore end, the first bore end merging with the longitudinal hole; the drive arm further defines a through slot; and the internal bore opens into the through slot; wherein the through slot is open to the suction chamber when the compressor is undergoing high displacement and the through slot is closed to the suction chamber when the compressor is undergoing low displacement, the low displacement being less than the high displacement.