Patent ID: 7201569

Claim:
Screw compressor, comprising: a compressor housing, a refrigerant inlet in said compressor housing, a refrigerant outlet in said compressor housing, two screw rotors, which are disposed in screw rotor bores in the compressor housing, said screw rotors compressing a refrigerant that enters at the refrigerant inlet and allowing the refrigerant to leave at the refrigerant outlet, a cooling inlet, for additional refrigerant provided in the compressor housing at a portion of said compressor housing having a pressure level that is higher than the pressure level at said refrigerant inlet, said additional refrigerant being supplied by a refrigerant injection via a conduit system, for additional cooling of the screw compressor, the cooling inlet being disposed in such a manner that it opens out in compression spaces surrounded by the screw rotors and the screw rotor bores, a first inlet passage section being connected to the cooling inlet and running within the compressor housing, a second inlet passage section adjoining said first inlet passage section running within the compressor housing, an insert part fitted in the second inlet passage section, the insert part having a feed passage leading to an injection opening for the additional refrigerant supplied by the refrigerant injection, said injection opening opening out in said first inlet passage section, the feed passage having a larger cross-sectional area than the injection opening, and a cross-sectional area of the injection opening being smaller by more than a factor of approximately four than a cross-sectional area of the first inlet passage section.