12results 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.

The utility model relates to a side suction type centrifugal pump, the radial hole for producing the suction force when the runner rotates is set up along the radial of runner on runner, still through the male ring of the female ring in the liquid seal cover ring and the female ring of runner cover connection, form rotatable, when the dynamic closed structure of the dynamic sealing of fluid is carried out in the side suction type centrifugal pump work, the inner chamber of the seal part storage liquid chamber is negative pressure area, the air of outside will leak into the pump chamber, and the machine seal of the utility model can prevent air leak and liquid leak out. The utility model has the advantages that: avoid the big particle slurry to enter the runner radial hole channel, prevent the runner hole from being blocked, the shaft sealing position pressure is low, the vacuum degree is high, can bear the fluid pressure of pump machine inlet 0.1MPa within, and under the premise of setting the wind wheel, the shaft seal (machine seal) used can radiate heat without external cooling water, is safe in operation, and has long service life, under the condition that the inlet fluid pressure is 0.06MPa, can improve the service life of shaft seal (machine seal) 3-4 times.

The utility model relates to the technical field of valves, in particular to a stop valve. A stop valve comprises a valve body assembly, a valve element assembly and a static valve element, a valve port is formed in the valve body assembly, the valve element assembly and the static valve element are arranged in the valve body assembly, one end of the valve element assembly is arranged on the static valve element, and the valve element assembly can rotate to block or open a communicating hole; the stop valve further comprises a positioning structure, the valve body assembly comprises a valve pipe, the valve element assembly is sleeved with the positioning structure, the positioning structure is arranged in the valve pipe, the outer wall of the positioning structure abuts against the inner wall of the valve pipe, the inner wall of the positioning structure abuts against the valve element assembly so that the valve element assembly can be limited in the radial direction, and the end, close to the static valve element, of the positioning structure abuts against the valve element assembly. And the valve core assembly is axially limited. The check valve has the advantages that the concentricity of the valve element assembly and the static valve element can be guaranteed, and internal leakage caused by a gap generated between the movable valve element and the static valve element is prevented.

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.

The utility model relates to the technical field of valves, in particular to an electric valve. The electric valve comprises a valve body assembly and a gate plate assembly, the valve body assembly is provided with a circulation cavity, a first circulation opening and a second circulation opening, the first circulation opening and the second circulation opening are communicated with the circulation cavity, and the gate plate assembly is movably installed in the circulation cavity and used for controlling connection and disconnection of the first circulation opening and the second circulation opening. The flashboard assembly comprises a first valve head and a second valve head, one end of the second valve head is arranged between the first circulation opening and the second circulation opening, and the other end of the second valve head is movably connected with the first valve head. And the second valve head part and the first valve head part can generate relative displacement in the direction perpendicular to the axis of the second valve head part. According to the electrically operated valve, the problem that a gate plate of an existing gate valve is prone to being stuck is solved.

The utility model relates to the technical field of valves, in particular to a stop valve. A stop valve comprises a valve body assembly, a valve element assembly and a static valve element, a valve port is formed in the valve body assembly, the valve element assembly and the static valve element are arranged in a valve pipe of the valve body assembly, the static valve element is arranged at the valve port and provided with a communicating hole communicating with the valve port, the valve element assembly is arranged on the static valve element, and the valve element assembly can rotate to block or open the communicating hole; the stop valve further comprises a positioning assembly, the valve element assembly is sleeved with the positioning assembly, the positioning assembly is arranged in the valve pipe, the outer wall of the positioning assembly abuts against the inner wall of the valve pipe, and the inner wall of the positioning assembly abuts against the valve element assembly. The stop valve has the advantages that the valve element assembly can be limited to prevent the valve element assembly from deflecting in the long-term use process, and therefore inner leakage of the stop valve is prevented.

The invention belongs to the technical field of nuclear fuel manufacturing, and particularly relates to an interlayer gas pressure measuring device and method for a double-layer cladding single rod. Comprising a cladding tube inner tube, a cladding tube outer tube, a center hole plug, a single-layer through hole, a lower end plug and a center air channel, the cladding tube outer tube is sleeved with the cladding tube inner tube 1, the lower end plug is installed at the end of the cladding tube outer tube and packages the cladding tube inner tube in the cladding tube outer tube, the center hole plug is installed at the end of the cladding tube inner tube, and the single-layer through hole is formed in the center air channel. A central air passage is formed in the middle of the lower end plug, and a single-layer through hole is formed in the side wall surface of the lower end plug. The sealing structure has the advantages that sealing is reliable, the center hole plug and the end plug are welded, and internal leakage is avoided; 2, non-destructiveness: the outer wall of the cladding tube is not damaged in the measurement process, and the cladding tube can be recycled; and 3, process compatibility: the special-shaped end plug of the interlayer gas detection device can be prepared by using a process end plug without customization.

The utility model relates to the technical field of valves, in particular to a gate valve. The gate valve comprises a valve body assembly and a gate plate assembly, the valve body assembly is provided with a circulation cavity, a first circulation opening and a second circulation opening, the first circulation opening and the second circulation opening communicate with the circulation cavity, and the first circulation opening and the second circulation opening are formed in the axial direction of the valve body assembly at intervals. The gate valve further comprises a first sealing piece and a second sealing piece, the gate valve has a fully-closed state, and in the fully-closed state, the first sealing piece and the second sealing piece are arranged at the two ends, in the axial direction of the circulation cavity, of the first circulation opening or the second circulation opening correspondingly. The first sealing piece and the second sealing piece are in sealing fit with the inner wall of the circulation cavity and the outer side wall of the gate plate assembly correspondingly so that the gate plate assembly can block one of the first circulation opening and the second circulation opening. According to the gate valve, the problems that an existing gate valve is complex in sealing structure and high in internal leakage risk are solved.

The utility model relates to the technical field of valves, in particular to a stop valve. The utility model provides a stop valve which comprises a valve pipe, a valve rod, a movable valve element and a static valve element, and one end of the valve rod is connected to the movable valve element and can drive the movable valve element to rotate so as to open or plug a communicating hole; the stop valve further comprises a limiting piece and a compensation structure, the limiting piece is fixedly connected with the inner wall of the valve pipe, the limiting piece abuts against the side, away from the static valve element, of the compensation structure in the axial direction of the valve pipe, and the other side of the compensation structure abuts against the valve rod. The compensation structure comprises an elastic piece, one end of the elastic piece directly or indirectly abuts against the limiting piece, and the other end of the elastic piece directly or indirectly abuts against the valve rod. The check valve has the advantages that when the static valve element and / or the movable valve element are / is abraded or loosened, the limiting piece can provide pressing force for the compensation structure, so that the compensation structure can apply axial force to the valve rod, the displacement loss of the movable valve element can be compensated, the movable valve element and the static valve element are tightly attached, and inner leakage is prevented.

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.