Patent ID: 6648617
Filing Date: 2003-11-18
Classification: F04C

Abstract:
A method for compressing a compressible medium comprising:providing a compressor having at least two displacement elements each of which defines a helical outer and a helical inner limiting face, at least one displacement element being orbitally movable relative to the other, thereby forming at least one chamber defining a volume that is changeable with the relative movement of the displacement elements, one to the other, said displacement elements each further defining a profile back, each profile back being cooperable with one of said helical inner limiting faces; causing relative motion to occur between the at least two displacement elements to accomplish at least one compressor cycle having a suction phase, a compression phase, and a discharge phase; forming a suction chamber during said suction phase, said suction chamber defining a suction chamber volume; and causing said volume of said at least one chamber to reduce during said suction phase such that upon completion thereof said suction chamber volume is at least about 90% of a maximum volume occurring during said suction phase.