CONTROL SYSTEM OF CENTRIFUGAL PUMP Russian patent published in 2011 - IPC F04D15/00 F04D13/06 

FIELD: engines and pumps.

SUBSTANCE: control system of centrifugal pump includes unit 1 setting the control parametre, the output of which is connected to the first input of comparing unit 2, adder unit 6, and differentiating unit 9. Output of centrifugal pump 5 is connected to sensor 10 of controlled parametre. The second input of comparing unit 2 is connected to output of adder unit 6. Integrating unit 3 is connected to output of comparing unit 2. Output of integrating unit 3 is connected to input of asynchronous electric motor 4 the output of which is connected to input of centrifugal pump 5. Asynchronous electric motor 4 is connected to rotation frequency sensor 8 the output of which is connected to the second differentiating unit 7 the output of which is connected to the first input of adder unit 6. Sensor 10 of controlled parametre is connected to input of differentiating unit 9 the output of which is connected to the second input of adder unit 6. The third input of adder unit 6 is connected to output of sensor 10 of controlled parametre.

EFFECT: improving accuracy of control system of centrifugal pump in steady-state modes owing to introducing electric motor of pump into control loop of feedback as to rotation frequency.

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