METHOD AND DEVICE FOR COMPENSATING FLOW RATE PULSATION OF POSITIVE DISPLACEMENT PUMP Russian patent published in 1998 - IPC

FIELD: mechanical engineering; pumps; compensation of flow rate pulsations both in suction and delivery channels of adjustable and nonadjustable positive displacement pumps. SUBSTANCE: pulsating liquid flow is formed by energy of external source and value of correcting flow rate of liquid pulsating flow at each moment of time is preset positively as function of current value of pump flow rate instantaneous speed change according to designed equations. Device has electrohydraulic drive of displacer. Output of liquid instantaneous flow rate pickup is connected with differential input. The latter is made for connection through its output selectively, with negative and positive inputs of operational amplifier. Output of operational amplifier is connected to control input of displacer of electrohydraulic drive. EFFECT: enlarged operating capabilities. 7 cl, 1 dwg