Patent ID: 7976296

Claim:
A compressor comprising: a housing; a non-orbiting scroll member supported within said housing and including a first end plate and a first spiral wrap extending from said first end plate; a first porting extending through said first end plate and having a first angular extent of at least twenty degrees; an orbiting scroll member driven by a drive shaft, supported within said housing and including a second end plate having a second spiral wrap extending therefrom and meshingly engaged with said first spiral wrap to form a series of compression pockets, said first porting being in communication with a first of said compression pockets during a portion of a compression cycle of said orbiting and non-orbiting scroll members, said first and second spiral wraps abutting one another at a first location to define first modulated capacity pockets when said orbiting scroll member is in a first position, said first modulated capacity pockets including a set of radially outermost compression pockets located radially inward relative to said first porting and isolated from communication with said first porting during an entirety of said compression cycle, said first porting aligned with said second spiral wrap at a location radially outward from and directly adjacent said first modulated capacity pockets when said orbiting scroll member is in the first position, a starting point of said first porting being rotationally aligned with the first location and an ending point of said first porting being rotationally spaced from the starting point by said first angular extent in a rotational direction of said drive shaft; and a second porting extending through said first end plate and having a second angular extent of at least twenty degrees, said second porting being in communication with a second of said compression pockets during a portion of said compression cycle, said first and second spiral wraps abutting one another at a second location to define second modulated capacity pockets when said orbiting scroll member is in a second position subsequent to the first position, said second modulated capacity pockets including a set of radially outermost compression pockets located radially inward relative to said first and second porting and isolated from communication with said first and second porting during an entirety of said compression cycle, a starting point of said second porting being rotationally aligned with the second location and an ending point of said second porting being rotationally spaced from the starting point of said second porting in a rotational direction opposite the rotational direction of said drive shaft, the ending point of said second porting being rotationally spaced from said starting point of said first porting by less than 180 degrees in the rotational direction of said drive shaft.