Patent ID: 6318977
Filing Date: 2001-11-20
Classification: F04B

Abstract:
A reciprocating compressor comprising:a cylinder, a piston that reciprocates in said cylinder, a chamber defined by said piston and said cylinder, means for admitting fluid to said chamber, means for discharging fluid from said chamber, an auxiliary port, a flow path from said chamber through said auxiliary port, and means for blocking flow through said flow path through said auxiliary port during a portion of the piston stroke, and means for adjusting the timing of operation of said means for blocking flow during operation of said compressor, whereby said compressor moves a controllable flow of fluid through said auxiliary port; said auxiliary port comprises a sidewall port which can be blocked by said piston and said means for blocking flow comprises means for moving said piston over said auxiliary port and said means for adjusting timing of operation of said means for blocking flow comprises means for varying the piston stroke whereby the flow through said auxiliary port varies in response to changes in the portion of the stroke during which the piston blocks said auxiliary port.