Abstract A motor-driven turbo-compressor is provided with a first regulator in the form of a device for adjusting the diffusor blades for varying the rate of air flow through the compressor in accordance with variation in the compressor delivery demand, this being sensed in the form of a variation in output air pressure at the delivery side of the compressor and which produces a first signal which actuates the diffusor blade adjusting device. An anti-surging regulator controlled jointly by the air throughput rate and the output air pressure is also provided and produces a corresponding second signal. This second signal is combined with the first signal in a decoupling relay to produce a third signal which serves to actuate a blow-off valve located in the blow-off duct connected to the delivery duct of the compressor. The decoupling relay is also provided with an arrangement by which the first signal admitted to it is cancelled with an adjustable time delay so that it does not participate in forming the third signal when the regulating system is operating in a steady state mode.
Apparatus for regulating a turbo-compressor comprising first regulator means responsive to the output pressure at the delivery side of the compressor which varies in accordance with the variation in the compressor delivery demand and which produces a first regulating signal, means actuated by said first signal for varying the rate of aiR flow through the compressor, an antisurging regulator means responsive jointly to the air throughput rate of the compressor and the compressor output pressure for producing a second signal, a blow-off valve controlling air flow through a blow-off duct connected to the delivery duct from the compressor, a de-coupling relay receiving as joint inputs thereto said first and second signals and which includes means therein which add said first and second signals to produce a third signal, and means actuated by said third signal for actuating said blow-off valve.
Claim 2
Dependent Claim
140 words
Apparatus for regulating a turbo-compressor comprising first regulator means responsive to the output pressure at the delivery side of the compressor which varies in accordance with the variation in the compressor delivery demand and which produces a first regulating signal, means actuated by said first signal for varying the rate of aiR flow through the compressor, an antisurging regulator means responsive jointly to the air throughput rate of the compressor and the compressor output pressure for producing a second signal, a blow-off valve controlling air flow through a blow-off duct connected to the delivery duct from the compressor, a de-coupling relay receiving as joint inputs thereto said first and second signals and which includes means therein which add said first and second signals to produce a third signal, and means actuated by said third signal for actuating said blow-off valve.
Claim 3
Dependent Claim
55 words
Regulating apparatus as defined in claim 1 and wherein said de-coupling relay includes means by which said first signal admitted to it is cancelled with an adjustable time delay so that it does not participate with said second signal in forming said third signal when the regulating system is operating in a steady state mode.
Claim 4
Dependent Claim
96 words
Regulating apparatus as defined in claim 2 wherein said first and second signals are of the hydraulic type and wherein said de-coupling relay is constituted by a dual piston which actuates a valve controlling the pressure of hydraulic fluid applied to a servo motor which actuates said blow-off valve, the two pistons of said dual piston being subjected respectively to said first and second hydraulic signals, and there being an adjustable choke valve located in a compensation duct extending to opposite sides of the piston actuated by said first signal for producing said adjustable time delay.