Patent ID: 6123517
Filing Date: 2000-09-26
Classification: F04C

Abstract:
A scroll-type refrigeration compressor comprising:a first scroll member having a first end plate and a first spiral wrap upstanding therefrom;a second scroll member having a second end plate and a second spiral wrap upstanding therefrom, said first and second spiral wraps being interleaved to define at least two moving fluid pockets which decrease in size as they move from a radially outer position to a radially inner position upon relative orbital movement of said wraps;a stationary body supporting said second scroll member for orbital movement with respect to said first scroll member;a first fluid passage provided in one of said scroll members extending from a first fluid pocket and communicating with an opening disposed on a radially outwardly facing peripheral surface of one of said stationary body and said one of said scroll members;a valve ring disposed adjacent said peripheral surface, said valve ring including a first radially inwardly facing surface movable into and out of overlying relationship with respect to said opening to respectively close and open said passage; andan actuating assembly operable to effect movement of said valve ring with respect to said peripheral surface to thereby move said surface into and out of overlying relationship with said opening whereby the capacity of said compressor may be modulated.