ENERGY-SAVING METHOD OF CONTROL LIQUID FLOW RATE IN HYDRAULIC SYSTEMS AND HYDRAULIC SYSTEM FOR IMPLEMENTING THE METHOD Russian patent published in 2005 - IPC

FIELD: mechanical engineering, agriculture machine tool building, oil producing and mining industries.

SUBSTANCE: invention can be used as hydraulic drives and in hydraulic systems of different machines and mechanisms. According to proposed energy-saving method to control liquid flow rate in hydraulic systems containing at least two operating hydraulic motors supplied by one nonadjustable pump, working liquid flow from pump is fed simultaneously to all hydraulic motors through displacement flow divider made in form of combined pump-turning units, with excess flow of working liquid in hydraulic line of most loaded hydraulic motor from metering valve is returned through logic element to input of displacement flow divider, and working liquid pressure in hydraulic line of most loaded hydraulic motor is raised by combined pump-turbine unit of displacement flow divider operating as pump installed behind nonadjustable pump and set into operation by combined pump-turbine unit of displacement flow divider operating as hydraulic motor, and energy of returned flow of working liquid in one of hydraulic machines of displacement flow divider having positive pressure difference and operating at side moment as hydraulic motor is recuperated. Hydraulic system contains at least two operating hydraulic motors connected by hydraulic lines with nonadjustable pump through displacement flow divider made in form of combined pump-turbine units. Hydraulic system is provided with logic elements and flow governors installed in hydraulic lines connecting hydraulic motors with output of displacement flow divider. Flow governor is made in form of adjustable throttle input and output of which are connected, respectively, with output of displacement flow divider and hydraulic motor, and metering valve whose input and control space are connected to input of throttle. Spring space of metering valve is connected by additional control line to output of throttle, and output of metering valve is connected to input of logic element made in form of two-position three-line hydraulic distributor. One of control line of hydraulic distributor is connected to output of metering valve, and the other, to input of displacement flow divider. One of outputs of three-line hydraulic distributor is connected to displacement flow divider and other output is connected to drain line.

EFFECT: reduced power consumption.

3 cl, 1 dwg