Patent ID: 6176686
Filing Date: 2001-01-23
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 first fluid passage provided in said first scroll member and extending generally radially from one of said at least two moving fluid pockets to a radially outer peripheral surface of said first scroll member;a second fluid passage provided in said first scroll member and extending generally radially from a second of said at least two moving fluid pockets to a radially outer peripheral surface of said first scroll member; andan elongated member having opposite ends and extending circumferentially around a portion of said first scroll member, said portion being less than the full circumference of said first scroll member, said elongated member being movable between a first position in which said first and second fluid passages are in open communication with an area at substantially suction pressure and a second position in which communication of said first and second passages with said area at substantially suction pressure is resisted.