TWO-CYLINDER SLUDGE PUMP Russian patent published in 1995 - IPC

FIELD: mechanical engineering. SUBSTANCE: piston accumulator is made in form of accumulating cylinder whose working chamber is connected with supply pipe line at delivery cylinder outlet. Accumulating cylinder hydraulic control drive has hydraulic cylinder located coaxially relative to accumulating cylinder and its housing is connected with housing of accumulating cylinder. Piston of hydraulic cylinder is connected with piston of accumulating cylinder by common rod and is mounted in housing of hydraulic cylinder so that its extreme working position should correspond to extreme working positions of accumulating cylinder. Two lines of distributor controlled by signal of delivery cylinder change-over sensor are connected respectively to pressure and return mains. Controllable distributor is two-position four-line device. Control chambers of saddle valves are connected respectively to the third and fourth lines of distributor. Piston chamber of hydraulic cylinder is in direct communication with pressure main through hydraulic line and is connected to inlet of one valve whose outlet is in communication through hydraulic line with inlet of second valve whose outlet is in communication with return line. Control chamber of selector valve is connected to hydraulic line which brings rod chamber of hydraulic cylinder in communication with inlet of second valve. Outlet of selector valve is connected to one of control chambers of distributor whose other control chamber is connected with sensor. Inlet of selector valve is connected to chamber of hydraulic cylinder for changing-over the distributor when piston of hydraulic cylinder is in extreme lower working position. EFFECT: enhanced reliability. 4 cl, 3 dwg