Surge control for variable speed-variable geometry compressors

Details Surge control for variable speed-variable geometry compressors Surge control for variable speed-variable geometry compressors

1977-09-14

1979-08-07

Gruber, Felix D.

Boots, shoes, and leggings

60 3929, 415 17, 415 39, F02C 914, F04D 2702

Patent

active

041640357

ABSTRACT:
Surge control systems prevent and control a surge condition for fixed or variable speed compressors and compressors having variable geometry which provide air to pneumatic loads. A signal proportional to the ratio of the measured compressor outlet pressure to the measured inlet pressure is combined with a signal corresponding to a selected reference pressure to provide a vent valve command signal. When the signal representing the ratio of the measured pressure exceeds the signal corresponding to the selected reference pressure, a surge condition is developing and the vent valve command signal causes a valve to vent a portion of the air to the pneumatic load. The venting of the air reduces the measured pressure ratio and the vent valve command signal decreases, to close the valve. A signal is provided to reduce the effect of the reference pressure ratio if the weight flow rate through the compressor is reduced, as by decreasing compressor speed and/or repositioning the inlet guide vanes of the compressor.

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