Patent ID: 6217302
Filing Date: 2001-04-17
Classification: F04C

Abstract:
The scroll compressor comprising:a first scroll member having a base and a generally spiral wrap extending from said base;a second scroll member having a base and generally spiral wrap extending from said base, said wraps of said first and second scroll members interfitting to define compression chambers, said second scroll member being driven to orbit in a first direction relative to said first scroll member;a housing receiving said first and second scroll members;said base of said first scroll member including a discharge port, and said first scroll member being moveable axially along an orbit axis of said second scroll member; anda back pressure chamber formed on an opposed side of said base of said first scroll member relative to said second scroll member, said back pressure chamber communicating with a source of compressed fluid, said back pressure chamber defined by an axially moveable seal, said axially moveable seal being moveable within said back pressure chamber and against another component in said scroll compressor, said back pressure seal being biased toward said other component, and said back pressure seal further being associated with a check valve for blocking flow from said back pressure chamber outwardly of said back pressure chamber, but said check valve allowing flow into said back pressure chamber.