Patent ID: 8628316
Filing Date: 2014-01-14
Classification: F04C

Abstract:
1. A compressor comprising: a housing; a first scroll member having a first axial end surface, supported within said housing and including a first end plate having a discharge passage, a first spiral wrap extending from a first side of said first end plate and a first aperture extending through said first end plate; a second scroll member having a second axial end surface, supported within said housing and including a second end plate having a second spiral wrap extending therefrom, said first and second spiral wraps meshingly engaged and forming a series of pockets during orbital displacement of the second scroll member relative to the first scroll member, said first aperture being in communication with a first of said pockets; and a modulation assembly located within said housing and including an annular piston, said modulation assembly operable in a full capacity mode with said annular piston isolating said first aperture from a suction pressure region of the compressor to operate the compressor at a full capacity during orbital displacement of said second scroll member relative to said first scroll member and operable in a reduced capacity mode with said annular piston permitting said first aperture to be in communication with said suction pressure region to operate the compressor at approximately zero capacity during orbital displacement of said second scroll member relative to said first scroll member while said first axial end surface contacts said second scroll member or said second axial end surface contacts said first scroll member.