4results about How to "Reduce internal leakage" patented technology

The invention provides a magnetically levitated train undercarriage control system based on array type combination valves, and belongs to the technical field of rail transit vehicle brake control. The system is applied to a maglev train in a high-intensity magnetic field environment and comprises an oil source device; the at least one undercarriage control device is mounted on a suspension frame of the maglev train, and each undercarriage control device comprises at least one undercarriage actuating cylinder used for driving the extension or retraction of the undercarriage; the array type combination valve is connected between the oil source device and the undercarriage actuating cylinder, the array type combination valve is composed of a plurality of switch type electromagnetic valves, and pressure oil is controlled to enter or be discharged out of different working cavities of the undercarriage actuating cylinder by controlling the combination of the power-on state and the power-off state of the switch type electromagnetic valves, so that extension or retraction of the undercarriage is achieved. The invention aims to solve the technical problem that the maintenance period is short due to the fact that an existing hydraulic control system for the undercarriage of the magnetically levitated train is poor in reliability and prone to inner leakage and clamping stagnation in a high-intensity magnetic field environment.

The utility model provides a sealing device for a hydraulic cylinder, which comprises a cylinder body, a piston rod and a cylinder cover, the lower end of the piston rod is mounted in a plug-in piston base, an H-shaped piston bush is sleeved on the outer side of the piston rod, a sealing plate is arranged below the H-shaped piston bush, a buffer mechanism is arranged at the lower end in the cylinder body, and the buffer mechanism is connected with the cylinder cover. The buffering mechanism comprises a sleeve, a movable column, a buffering plate and a spring, the movable column is sleeved with the spring, one end of the spring is fixedly connected with the buffering plate, the other end of the spring is fixedly connected with the sleeve, the sleeve is fixedly installed at the bottom of the cylinder body, the upper end of the movable column is fixedly connected with the buffering plate, and a buffering rubber layer is arranged on the upper surface of the buffering plate. A double dynamic sealing system can be constructed, and the risk of hydraulic oil leakage is remarkably reduced; the variable stiffness spring and the honeycomb damping buffer rubber layer are used for effectively absorbing impact energy of the piston rod, and vibration and noise are reduced.

The utility model relates to control valve technical field, concretely is a kind of flat plate type high wear-resisting multiway distribution valve, including valve body, the inside of valve body is equipped with multiple valve core driven by driving rod drive to advance, the side of valve body is fixed with valve cover, the inside of valve cover is fixed with sealing seat, sealing seat is equipped with the valve cavity corresponding with valve core position one to one, the inside of every valve cavity can detachably install wear-resisting nested ring, the inside of wear-resisting nested ring is embedded and is installed with flexible sealing ring, and the rear end of every valve core is equipped with the self-adapting compensation mechanism by auxiliary sealing snap ring and spring piece. The flat plate type high wear-resisting multiway distribution valve effectively improves the wear resistance and sealing reliability of valve core and valve body mating surface, reduces internal leakage, improves control accuracy, prolongs service life, and is suitable for stable operation under high-frequency commutation and high-pressure working condition.

The invention discloses an integrated piezoelectric pump based on a reciprocating displacement active valve, which belongs to the technical field of valved piezoelectric pumps, and comprises a reciprocating displacement pumping composite assembly, a combination chamber, a pump body shell, a passive liquid inlet assembly and a passive liquid outlet assembly, the combination chamber is connected into the pump body shell in a sliding mode, and the reciprocating displacement pumping composite assembly is installed on the combination chamber. The reciprocating displacement pumping composite assembly comprises a left displacement composite substrate and a right displacement composite substrate which are the same in structure. The left displacement composite substrate is of a series arch structure and comprises piezoelectric ceramics, a left displacement substrate, k pumping substrates, a displacement driving supporting part, k-1 lower supporting parts, a swing supporting part and an upper supporting part. The piezoelectric ceramic vibrates to drive the pumping base plate on the lower side of the piezoelectric ceramic to vibrate up and down, the displacement driving supporting part and the swing supporting part swing in a reciprocating mode, and k-1 lower supporting parts are kept still. Circulating reciprocating displacement of the combined chamber relative to the pump body shell can be achieved, and then the active liquid inlet valve and the active liquid outlet valve are opened alternately.