Patent ID: 6290478
Filing Date: 2001-09-18
Classification: F04C

Abstract:
A scroll compressor comprising:a first scroll member having a base plate and a generally spiral wrap extending from said base plate;a second scroll member having a base plate and a generally spiral wrap extending from said base plate, said spiral wraps of said first and second scroll members interfitting to define compression chambers;a back-pressure chamber defined on a side of said base plate of one of said first and second scroll members removed from the other of said first and second scroll members;said second scroll member orbiting relative to said first scroll member and being driven by a shaft, said shaft having a pin extending upwardly into a boss in said second scroll member to communicate rotational drive of said shaft into orbiting movement of said second scroll member, said shaft defining a rotational axis; andsaid back-pressure chamber being off-center relative to said axis, said back pressure chamber having a relatively fixed cross-sectional area which does not change during the orbital movement of said second scroll member.