초록 ▼

A stall control system for axial flow compressors incorporating: a plurality of pressure transducers for developing signals indicative of the nonsteady pressure variations within the compressor and wherein these signals are separately filtered and rectified; analog comparators and gate comparators f

A stall control system for axial flow compressors incorporating: a plurality of pressure transducers for developing signals indicative of the nonsteady pressure variations within the compressor and wherein these signals are separately filtered and rectified; analog comparators and gate comparators for each such signal to develop an output indicative of the difference between each of the signals and an adjusted pressure reference signal which is derived from the pressure rise across the compressor; a logic circuit for generating an actuating signal if any one of such signals is higher than the reference signal for controlling the opening of a gate which passes the combined pressure signals to an integrator which develops an output control signal to take corrective action in the presence of rotating stall within the compressor: an adjustable time delay circuit providing long and short decay times to prevent over-control.

대표청구항 ▼

A stall control system for compressors, comprising: (a) first means for generating a varying reference pressure signal in response to operating conditions within a compressor, (b) a plurality of pressure responsive elements located within the housing of a compressor for developing signals indicative

A stall control system for compressors, comprising: (a) first means for generating a varying reference pressure signal in response to operating conditions within a compressor, (b) a plurality of pressure responsive elements located within the housing of a compressor for developing signals indicative of the nonsteady pressure variations therein, (c) separate means associated with each one of said elements for separately filtering and rectifying each of said signals, (d) second means for independently comparing each one of said filtered and rectified signals with said reference pressure signal and developing an intermediate control signal if any one of said filtered and rectified signals exceeds said reference pressure signal, (e) third means for developing a composite signal indicative of the combined amount by which each of said signals exceeds said reference pressure signal, (f) fourth means responsive to said intermediate control signal for integrating said composite signal to generate a control signal for influencing the actuation of a controlled variable within a compressor, and (g) means for varying the decay rate of said control signal.