Patent ID: 9267501
Filing Date: 2016-02-23
CPC Classification: F04C

Claim Text:
1. A compressor comprising: a first scroll member including a first end plate having a first spiral wrap extending therefrom; a second scroll member supported relative to said first scroll member and including a second end plate having a second spiral wrap extending therefrom and meshingly engaged with said first spiral wrap, said second end plate defining a discharge port, bypass porting and a biasing passage, said biasing passage being in communication with said bypass porting during a portion of a compression cycle of the compressor, said biasing passage located at least 270 degrees outward from said bypass porting along said second spiral wrap; and a seal engaged with said second scroll member, said seal and said second scroll member defining an axial biasing chamber in communication with said biasing passage, wherein said first and second spiral wraps initially define an intermediate pocket at a suction seal-off condition and progressively compress fluid within said intermediate pocket during compressor operation until said intermediate pocket is in communication with said discharge port, said intermediate pocket being in communication with said bypass porting no earlier than an angle α of orbital displacement of said first scroll member relative to said second scroll member defined by: where VR is a volume ratio of the compressor defined by said bypass porting, R or is radius of first spiral wrap orbiting motion, R g is a base circle radius defining an involute curve of said second spiral wrap and is defined by: where T is thickness of said second spiral wrap, Φ is an angle indicative of second spiral wrap length and is defined by: where L is a maximum distance defined between inner radial surfaces of said second spiral wrap.