Compressor surge control

Details Compressor surge control Compressor surge control

F - Mech Eng,Light,Heat,Weapons

15

B

121/68

F15B 21/02 (2006.01) F04D 27/02 (2006.01) G05B 19/44 (2006.01)

Patent

CA 1087047

ABSTRACT OF THE DISCLOSURE 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 compared 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.

309896

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