Scroll compressor with refrigerant injection system

A scroll compressor, comprising:

• a housing including a suction pressure chamber and a discharge pressure chamber;
• a motor-compressor unit disposed within said housing, including a crankcase and a stator, rotor, and drive shaft assembly, said drive shaft rotatably supported by said crankcase;
• a first scroll member fixed with respect to said housing, said first scroll member comprising:
• a base plate separating an interior of said housing into said suction and discharge pressure chambers;
• a first wrap extending from said base plate;
• and
• a second scroll member coupled to said drive shaft for orbital movement, said second scroll member including a second wrap intermeshed with said first wrap to define a plurality of variable-volume working pockets;
• and
• a refrigerant injection system, comprising:
• an inlet conduit disposed in said suction pressure chamber, said inlet conduit separate from said first scroll member and including a first end connected to an injection inlet fitting in said housing and a second end connected to a fitting in said first scroll member, each said fitting disposed within said suction pressure chamber;
• at least a pair of passages at least partially formed in said base plate of said first scroll member, said passages in fluid communication with said inlet conduit;
• at least a pair of injection ports in said base plate of said first scroll member, said injection ports in fluid communication with respective said passages and with said working pockets;
• and
• a cover plate secured to said base plate of said first scroll member and enclosing said passages, said cover plate disposed within said discharge pressure chamber.