Patent ID: 6517332
Filing Date: 2003-02-11
Classification: F04C

Abstract:
A scroll compressor comprising:a non-orbiting scroll member having a base plate and a scroll wrap extending from said base plate; an orbiting scroll member having a base plate and a scroll wrap extending from said base plate, said orbiting scroll member being driven relative to said non-orbiting scroll member through an operational cycle; said scroll wrap of said orbiting scroll member and said scroll wrap of said non-orbiting scroll member interfitting to define a plurality of pressure chambers; a back pressure chamber defined on a side of said base plate of one of said orbiting and non-orbiting scroll members remote from the other of said scroll member; and a system for tapping fluid to said back pressure chamber, said system including at least one vent hole selectively exposed to at least one of said pressure chambers during a portion of said operational cycle of said scroll member, and said vent hole being closed for the majority of said operational cycle, said vent hole being closed by the wrap of one of said orbiting and non-orbiting scroll members during the majority of said operational cycle.