Patent ID: 7278832

Claim:
A scroll compressor comprising: a first scroll member having a base and a generally spiral wrap extending from said base; a second scroll member having a base and a generally spiral wrap extending from its base, said wraps of said first and second scroll members interfitting to define compression chambers, with a first compression chamber being defined on one side of said second scroll wrap and a second compression chamber being defined at an opposed face, said second scroll member being caused to orbit relative to said first scroll member to change a size of said compression chambers; an injection port for injecting a refrigerant from an economizer cycle back into said compression chambers and for bypassing refrigerant out of said compression chambers, said injection port extending through said base of one of said first and second scroll members, said injection port having a cross-sectional area that is defined by a form other than a single opening which comprises a circle of constant diameter; and wherein during an orbiting cycle said second scroll member having its wrap initially on one side of said injection port, such that said injection port communicates with said first compression chamber, said wrap then moving over and blocking said injection port, and then moving past said injection port such that said injection port now communicates with said second compression chamber.