Patent ID: 6132179
Filing Date: 2000-10-17
Classification: F04C

Abstract:
A scroll type compressor comprising a compressor housing defining a suction chamber and a discharge chamber, a fixed scroll fixedly placed in said compressor housing, a movable scroll movably placed in said compressor housing, and a driving mechanism for making said movable scroll cause an orbital motion, said fixed scroll comprising a fixed plate member and a fixed spiral member fixed to said fixed plate member, said movable scroll comprising a movable plate member opposite to said fixed plate member in an axial direction and a movable spiral member fixed to said movable plate member to face said fixed spiral member in a radial direction perpendicular to said axial direction, said fixed and said movable spiral members defining a plurality of fluid pockets therebetween, each of said fluid pockets moving from an outer position of said fixed scroll towards an inner position thereof along said fixed spiral member during said orbital motion to communicate with said discharge chamber at said inner position, said compressor further comprising:a first communication hole made in said fixed plate member for communicating one of said fluid pockets with said suction chamber when said one of the fluid pockets is at a first particular position which is between said outer and said inner positions;a first valve mechanism coupled to said first communication hole and having a first operating pressure for opening or closing said first communication hole with reference to said first operating pressure in response to a differential pressure which is between said suction chamber and said discharge chamber;a second communication hole made in said fixed plate member for communicating another of said fluid pockets with said suction chamber when said another of the fluid pockets is at a second particular position which is between said outer and said inner positions and is different from said first particular position; anda second valve mechanism coupled to said second communication hole and having a second operating pressure for opening or closing said second communication hole with reference to said second operating pressure in response to said differential pressure, said second operating pressure being different from said first operating pressure.