Authors

The choice of profile gaps for oil-filled screw compressor

DOI: 10.21047/1606-4313-2017-16-4-41-45
UDC 621.514

The choice of profile gaps for oil-filled screw compressor

Noskov A.N., Tarasenkov D.S.

For citation: Noskov A.N., Tarasenkov D.S. The choice of profile gaps for oilfilled screw compressor. Vestnik Mezhdunarodnoi akademii kholoda. 2017. No 4. p. 41-45

Abstract
To calculate the leakage between the screws one should to select gaps along the normal to the profile surfaces of the screw compressor, which must ensure safe operation of the compressor in all modes of its operation. The gaps in the end plane depend on the type of slot, the initial clearance, the temperature of the screws and compressor parts, and the distance from the slot to the discharge end. The values of the gaps along the normal to the profile surfaces of the screws are related to the gaps in the end plane through the angle between the normal to the helical surface and the projection of this normal to the end plane. This angle depends on the type of profile and the angles of screw tightening. The initial gaps between the screws in the end plane are usually obtained by lowering the profile of the depression of the driven screw, the amount of understatement being the same for the front and back sides of the cavity. The oil-filled compressor has no gears between the screws, and the moment of the gas forces on the driven screw is directed towards the rotation. As a result, the surfaces of the screw profiles contact and increase the clearance along the front of the cavity of the driven screw. It is suggested to reduce the clearance in the end plane of the driven screw, taking into account the contact of the profiles. This selection of the gap between the profiles will allow reducing the size of the gaps along the normal to the helical surface, which will improve the characteristics of the cooling screw oil-filled compressor.

Keywords: refrigeration oil-filled screw compressor, profile gaps, contact of the screw profile surfaces, front part of the driven screw cavity.

All references

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