Control system for regulating large capacity rotating machinery

Details Control system for regulating large capacity rotating machinery Control system for regulating large capacity rotating machinery

1977-07-18

1979-05-01

Wayner, William E.

Refrigeration

Automatic control

Of external fluid or means

62228, 417 19, 417 32, F04B 4910, F25B 100

Patent

active

041517253

ABSTRACT:
The control system of the invention regulates a centrifugal compressor having inlet guide vanes adjustable as one means for varying the compressor capacity. A variable speed motor is connected to drive the compressor, and provides another means for regulating the compressor capacity. The control system regulates the motor speed alone over one portion of the load variation curve, and regulates the motor speed jointly with the inlet guide vane opening over another portion of the load variation curve, to achieve the most energy-efficient operating condition while avoiding the surge condition. This optimum control path is realized by utilizing a signal which is a measure of the compressor head value. Compressor surge or instability is avoided by deriving a critical Mach number (speed indication) for any given operating condition, as a function of the compressor head and vane position, and preventing the motor speed from going below that Mach number under the specific operating conditions. The control system of the invention is useful both with existing equipment, by way of retrofit, and with newly manufactured and installed equipment.

REFERENCES:
patent: 3355906 (1967-12-01), Newton
patent: 3555844 (1971-01-01), Fleckenstein
patent: 3780532 (1973-12-01), Norbeck et al.

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