| 摘要 |
The present invention relates to a screw compressor and a method for operating the compressor primarily for gaseous refrigerants, comprising a compressor housing, which comprises a male and a female screw rotor arranged in screw rotor bores in the compressor housing, which male and female rotor are co-rotatingly drivable and interacting for compressing the refrigerant, which screw compressor comprises at least one slider, which slider is movable in relation to the male and the female rotor, where movement of the slider controls the internal volume ratio of the screw compressor, which slider is moveable in a slider housing, which slider is in a direction sideways to the plane formed by the rotational axes of the male and the female rotor, which slider is interacting with the male and the female rotor. It is the object of the invention to develop a highly effective screw compressor, which screw compressor can regulate the discharge pressure. This can be achieved by a screw compressor as described in the opening paragraph if the slider comprises at least two surfaces, which surfaces are cooperating with subsequent surfaces placed in conjunction with the slider housing for controlling the angular and linear placement of the slider in its forward position. It can hereby be achieved that independent pressure volumes formed between the male and the female rotor during the interaction of the rotors are connected to the discharge before the last compression takes place, when this slider is moved away from its forward position. This will lead to a reduction of the discharge pressure of the compressor.
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