5results about How to "Prevent internal leakage" patented technology

The utility model discloses a kind of leak-proof sealing structure of hydraulic oil cylinder, comprising: cylinder barrel, telescopic rod is equipped in cylinder barrel interior, piston is threadedly connected with telescopic rod one end, and end cover is installed in one end of cylinder barrel;Sealing assembly, sealing assembly is located between end cover and cylinder barrel, and sealing assembly includes: first recess, first sealing ring, third recess, fourth recess, second sealing ring, placing groove and dustproof sealing element, first recess is set in end cover inner side, third recess is set in end cover outer side, first recess and third recess are each equipped with first sealing ring in interior, fourth recess is set in end cover inner side, second sealing ring is equipped in fourth recess interior, placing groove is set in one side of end cover, dustproof sealing element is equipped in placing groove interior.The utility model realizes the setting of sealing assembly, optimizes sealing structure layout, introduces self-tight type sealing mechanism and dustproof function, effectively solves the problems, such as traditional hydraulic oil cylinder is easily leaked, poor pollution resistance and the like.

The application discloses a kind of semi-active shock absorber, including cylinder body assembly and the base fixed in the rear end of cylinder body assembly, the cylinder body assembly includes pressure cylinder, intermediate cylinder and oil storage cylinder, piston assembly is arranged in the sliding seal of pressure cylinder, and pressure cylinder is divided into pressure cylinder upper cavity and pressure cylinder lower cavity, piston rod is arranged in the pressure cylinder upper cavity, the front end of piston rod extends to the outside of cylinder body assembly, and rear end is fixedly connected with piston assembly, valve group and oil circuit system are arranged on the base, the front end of intermediate cylinder is communicated with pressure cylinder upper cavity, and rear end is communicated with pressure cylinder lower cavity and oil storage cylinder by oil circuit system, and the valve group includes first high-speed on-off valve, second high-speed on-off valve, manual overflow valve, electric control proportional valve and third high-speed on-off valve which are distributed along the circumferential direction and surround the outer circumferential surface of cylinder body assembly.The application is integrally arranged with all control valves and shock absorber, and installation space is reduced, which can be interchangeably installed and used with passive shock absorber, without changing vehicle bogie structure.

This invention relates to an electronic expansion valve, comprising a drive assembly, a screw, a valve needle, a valve seat, a bearing, and a valve needle spring. The valve seat has a fluid passage. The drive assembly drives the screw to rotate and move axially. The valve needle has an axial mounting hole inside, and its upper part has a bearing cavity to accommodate the bearing. The lower end of the screw extends into the axial mounting hole and is rotatably connected to the bearing, allowing for axial sliding. A screw retaining ring is provided at its lower end, and a screw annular protrusion is provided on its outer periphery. The valve needle spring is sleeved on the screw and confined between the screw annular protrusion and the upper end face of the valve needle. Downward movement of the screw compresses the valve needle spring through the screw annular protrusion, pushing the valve needle downward. Upward movement of the screw pushes the valve needle upward through the screw retaining ring against the bearing, thereby achieving stable axial movement of the valve needle to precisely control the opening and closing of the fluid passage. This structure achieves pure axial transmission through the bearing, effectively preventing the valve needle from rotating and vibrating with the screw. The compact layout of the valve needle spring significantly shortens the axial dimension of the valve body, improving transmission reliability and service life.

This utility model provides a valve structure for a Roots flow meter, comprising a valve body section, a gasket ring, a valve ball washer, a valve ball, a valve stem, a valve ball support, a valve ball bottom plug, a bottom plug end cap, an upper controller housing, a geared motor, a lower controller housing, a coupling, and a sealing ring. The valve ball support is fixed to the valve ball with screws. A positioning step is provided inside the air inlet end of the valve body section. The valve ball washer is inserted from the air inlet end into the positioning step inside the valve body section, and when tightened, it cooperates with the valve ball to achieve a seal. The gasket ring has two ends... All components are fitted with rubber sealing rings; the gasket pressure ring is threaded to the valve body pipe section, pressing the valve ball gasket to the positioning step inside the valve body pipe section; this utility model is convenient to process, assemble, and maintain; while ensuring performance, the valve plate and annular bracket are used to optimize the processing and assembly processes, reducing costs; it has good sealing performance, reliably preventing internal and external leakage of the medium; the valve ball and PTFE gasket cooperate to achieve a tight seal, which is more effective in preventing internal leakage compared to valve structures with springs; multiple seals at the valve stem effectively prevent external leakage.

This utility model discloses a wide plate feeding system for alumina production decomposition tanks. It includes a feed pipe, with its inlet end connected to the upper part of the decomposition tank. The feed pipe is equipped with a feed valve and a pump. A siphon pipe is connected to the feed pipe on the outlet side of the feed valve. The siphon pipe bypasses the top of the decomposition tank wall, and its end extends below the liquid surface in the decomposition tank. An air inlet pipe is connected to the siphon pipe, also bypassing the top of the decomposition tank wall, with its end extending above the liquid surface in the decomposition tank. An air inlet valve is installed on the air inlet pipe. This system uses a siphon principle for wide plate feeding, reducing wear on the feed valve from the slurry, preventing internal leakage of the feed valve, and thus avoiding the phenomenon of wide plates being crushed.