Patent ID: 6116867
Filing Date: 2000-09-12
Classification: F04C

Abstract:
A capacity modulation system for a scroll-type 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;a fluid passage having one end opening into one of said moving fluid pockets and a second end opening outwardly along a peripheral surface of one of said first and second end plates;a valving ring having an opening therein and being rotatably supported on said one of said first and second end plates for movement of said opening into and out of overlying relationship to said second end; anda seal supported on one of said end plates and said valving ring and sealingly engageable with the other of said valving ring and said end plate to prevent fluid flow through said fluid passage when said valving ring is in overlying relationship to said passage.