Rotary screw compressor having a thrust balancing piston device and a method of operation thereof
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United States of America Patent
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-
Jan 13, 1998
Grant Date -
N/A
app pub date -
Aug 22, 1996
filing date -
Feb 28, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rotary screw compressor having a balancing piston device for balancing an axial gas force exerted on a pair of rotors during operation of the rotary screw compressor. The balancing piston device is exposed in one axial direction to a high pressure source on at least one first pressure surface, and in an opposite axial direction to one of a low pressure source and an intermediate pressure source on at least one second pressure surface. A valve is provided for selecting the low or the intermediate pressure source connection with respect to the at least one second pressure surface, whereby the thrust balancing force can be adapted to different working conditions such as starting up and full load operation in order to avoid underbalancing or overbalancing of the axial gas force.
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