8results about How to "Reduce internal leakage" patented technology

The utility model discloses a two-position three-way valve with a sealed sharp edge. Comprising a valve shell, a valve seat, a valve sleeve arranged in the valve shell, a valve element which is restrained at a first position by an axial elastic self-recovery part and overcomes the acting force of the elastic self-recovery part under the action of the axial external force to move from the first position to a second position, and a driving device used for applying the axial external force to the valve element. The driving device is arranged on the rear side of the valve element. The valve element of the two-position three-way valve is provided with the first conical surface and the second conical surface, the first conical surface abuts against the wall corner of the front opening of the valve sleeve and seals the second liquid channel only when the valve element is located at the first position, and the second conical surface abuts against the wall corner of the connecting position of the first inlet and outlet and the valve seat cavity only when the valve element is located at the second position. Therefore, a sharp-edge mechanical sealing mode is formed, the bidirectional locking function is achieved, the internal leakage amount is greatly reduced through the sealing mode, and the sealing device can be used for the working condition with the high pressure maintaining requirement.

A high-efficiency continuous rotating hydraulic joint and a control system comprise a swash plate mechanism used for driving the joint to rotate, the swash plate mechanism comprises a swash plate and a power output shaft, and the swash plate is driven by a plurality of multi-cavity hydraulic cylinders to achieve forward and reverse rotation of the power output shaft. The multiple multi-cavity hydraulic cylinders are evenly distributed below the swash plate with the power output shaft as the center, composite piston rods of the multi-cavity hydraulic cylinders and the power output shaft are distributed in parallel, the jacking ends of the composite piston rods are connected with ball bearing seats through ball bearings, and the jacking ends of the composite piston rods are assembled on the swash plate in a sliding mode through the ball bearing seats. The control system comprises an inner ring control system and an outer ring control system, different load matching control methods are adopted corresponding to different rotation angle positions of the power output shaft, fine adjustment of the proportional throttle valve is combined, high-precision constant torque control of the device in a continuous rotation motion state can be achieved, and the device is high in reliability and high in reliability. And high-precision variable-torque control can be realized to match the variable load torque.

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 discloses a pressure relief reducing and efficiency improving structure for a hydraulic breaking hammer, and relates to the technical field of hydraulic breaking hammers. The lubricating device comprises a middle cylinder and a piston, the surface of the piston is movably connected with the inner wall of the middle cylinder in an inserted mode, a lower oil groove is formed in the inner wall of the middle cylinder, a sealing groove is formed in the upper section of the front portion of the middle cylinder, a lubricating assembly is further arranged on the front portion of the middle cylinder, and a balance oil channel is formed in the inner wall of the middle cylinder. The sealing groove is formed in the upper section of the front portion of the middle cylinder, after a sealing ring is installed, a gap between the front section of the piston and the front portion of the middle cylinder is sealed well, and leakage of high-pressure hydraulic oil is basically zero. After the piston sealing ring is arranged on the large-diameter lower section of the piston, a gap between the middle section of the piston and the middle of the middle cylinder can be greatly reduced, and internal leakage of high-pressure hydraulic oil is greatly reduced.

The application discloses a novel hydraulic swing cylinder and relates to the technical field of hydraulic swing cylinders.The novel hydraulic swing cylinder comprises a swing oil cylinder, a rotary encoder, two sliding bearing supports, a limiting pin and a fixed-distance ring.The two ends of the swing oil cylinder are supported on the corresponding sliding bearing supports, and the swing oil cylinder comprises a cylinder body assembly, a vane shaft, an end cover assembly a, an end cover assembly b and a rolling bearing.The application is characterized in that a combined seal a is arranged on the inner and outer edges of a fan-shaped vane a, a combined seal b is arranged on the inner and outer edges of a fan-shaped vane b, a composite sliding sealing interface combined in the circumferential direction and the radial direction is formed, the internal leakage amount between high-pressure oil cavities and low-pressure oil cavities is effectively reduced, and the end cover assemblies at the two ends adopt a multi-stage sealing system composed of a main sealing ring, a radial sealing ring and an end face sealing ring, so that the radial fit clearance and the end face joint clearance are blocked respectively, and multiple sealing defense lines are formed.

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.