Patent ID: 8568118

Claim:
A compressor comprising: a compression mechanism having an orbiting scroll and a non-orbiting scroll meshed together and forming first and second moving fluid pockets therebetween, said first and second fluid pockets being angularly spaced apart from each other and decreasing in size as they move radially inward toward a radially innermost position; first and second ports disposed adjacent to each other in said non-orbiting scroll and radially spaced apart from each other such that said first port communicates with said first fluid pocket at a first radial position and said second port communicates with said second fluid pocket at a second radial position, said second radial position being radially intermediate relative to said first radial position and said radially innermost position; and a blocking device movable between a first position preventing fluid communication between said first and second ports and a fluid source and a second position allowing fluid communication between said first and second ports and said fluid source, said first and second fluid pockets having first and second fluid pressures, respectively, one of said first and second fluid pressures having a disproportionate pressure change compared to the other of said first and second fluid pressures after at least one of said first and second pockets has communicated with said fluid source through at least one of said first and second ports, said disproportionate pressure change biasing said orbiting scroll relative to said non-orbiting scroll.