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Gea Refrigeration Germany Gmbh

Grasso Gmbh Refrigeration Technology

Ottomar Neuwirth

Dieter Mosemann

Stefan Losch

Dmytro Zaytsev

Ole Fredrich

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

Screw compressor

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.

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.

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Berlin, Germany

Ottomar Neuwirth