Abstract: A screw compressor, in particular for refrigeration systems, comprising a compressor housing (1) which at least partly encloses the compressor, an integrated suction gas filter (2) and a non-return valve (7) that is to be actuated by pressurized gas; the compressor housing (1) has grooves, in particular drilled or cast ducts (13, 16 22, 23, 24) to which pressurized gas can be fed in order to control the non-return valve (7).

Abstract: A screw compressor (10) with at least one screw rotor (20, 22) which is rotatably arranged about a rotational axis arranged in the axial direction. The at least one screw rotor (20, 22) is arranged in a compression area (24) which is fluid-tight against the surrounding area at least in some sections and opens into a high-pressure volume (26). The compressor (10) further has a Vi slide (28) for influencing an inner volume ratio of the compressor, the Vi slide (28) at least partly forming a section of the fluid-tight border of the compression area (24) and being arranged such that the position of the slide can be adjusted in the axial direction. The Vi slide (28) can be continuously displaced, and the compressor (10) has a device (32) for detecting the position of the slide.

Abstract: In screw compressors for extremely high discharge pressures, the geometrical centers of all coaxial holes or housing bores are all located in one single housing section on the male rotor side at a certain first straight line and the geometrical centers of all coaxial holes or housing bores are all located in one single housing section on the female rotor side at a certain second straight line. The diameter of all coaxial holes in the housing on the male rotor side, and the diameters of all coaxial holes in the housing on the female rotor side, decrease from the open to the closed end of the housing section. Based on this construction, the bearings and the components adjacent to the bearings are guided at their periphery in one single housing section so that there will be no coaxial deviations caused by assembly and no coaxial deviations in long term operation.

Abstract: The invention relates to oil-flooded screw compressors having a male rotor and female rotor each featuring preferably a ratio of male-to-female rotor lobes of 4:6, 5:6 or 5:7. In order to decrease the bearing load at higher working pressures, the profile sections of the rotors are shortened, and an intermediate plate is appropriately arranged in the free space formed.

Abstract: Screw compressor having male- and female rotors for extremely high discharge pressures, the radial bearings and the supporting flanges enclosing the radial bearings tight-fitting adjoin the housing bores with their centres arranged on two parallel axes of the housing.

Abstract: In an arrangement on an oil-flooded screw compressor with two rotors, a male rotor having essentially convex lobe flanks and a female rotor having essentially concave flank portions, with the male rotor having a drive-shaft end and an oil-pressure loaded balancing piston supplied with oil via a pressure line, both rotors are enclosed in housing sections, with a regulating device arranged either on or in the compressor the inputs of which are at least connected to measuring means for the pressure on the suction side and measuring means for determination of the input power, wherein according to the invention means for changing the pressure in the pressure line to the balancing piston are arranged with said means having a control interconnection to the regulating device, with the latter having an algorithm between operating parameters representing input variables for the regulating device and the pressure in the pressure line to the balancing piston.

Abstract: The invention relates to oil-flooded screw compressors having a male rotor and female rotor each featuring preferably a ratio of male-to-female rotor lobes of 4:6, 5:6 or 5:7. In order to decrease the bearing load at higher working pressures, the profile sections of the rotors are shortened, and an intermediate plate is appropriately arranged in the free space formed.