24results 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 discloses a fully-sealed gate valve for discharging ash. The fully-sealed gate valve comprises a valve seat, a valve plate, a connecting rod, a spring adjusting device and a supporting wheel, the valve plate is connected with the connecting rod and installed in the valve seat in a reciprocating motion mode, the spring adjusting device is arranged at the bottom of the valve plate, and the supporting wheels are arranged on the two sides of the long edge of the valve seat and used for supporting the spring adjusting device. And the cooling chamber is arranged between the valve seat and the driving device. According to the gate valve, the valve plate is connected with the driving device through the connecting rod, the cooling chamber is arranged outside the valve seat, and the connecting rod and the sealing device are cooled by injecting cold air, so that the influence of high temperature on the sealing device and the driving device is reduced to a great extent, and long-term safe and reliable operation of the gate valve is realized.

The present invention discloses a valve pneumatic actuator, which relates to the technical field of valve actuators, including a cylinder body, a left end cover, a right end cover, a left piston and a right piston placed in the cylinder body, and a gear shaft meshed with the left piston and the right piston, and also includes a limit block fixed to the outer wall of the gear shaft, a limit assembly and an adjustment assembly, the limit assembly is arranged in the cylinder body, and is used to limit the limit block; the adjustment assembly is arranged on the cylinder body and is located below the limit assembly, and the adjustment assembly is used to adjust the speed of the left piston and the right piston moving in the cylinder body through the limit assembly. The present invention continuously compresses the first elastic member, so that the moving distance of the first slider in the first guide groove continuously changes, so that the cross section of the first air inlet hole continuously decreases with the compression of the third elastic member, and the air intake flow of the first air inlet hole is controlled, so as to prevent the left piston and the right piston from moving too fast in the cylinder body, resulting in the problem that the left piston and the right piston in the cylinder body are separated from the gear shaft.

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 discloses a pressure regulating valve, and relates to the technical field of valves. The pressure regulating valve comprises a valve body, a valve cavity, an execution assembly, a flow path and a valve rod movably arranged in the flow path, the flow path is provided with a pressure regulating channel communicating with the valve cavity, the valve rod comprises a rod body arranged in the pressure regulating channel in a penetrating mode, a connecting end and a sealing end, and the connecting end and the sealing end are arranged at the two ends of the rod body correspondingly. The connecting end is located in the valve cavity and connected with the executing end of the executing assembly, and the sealing end is located in the flow path and can shield the pressure adjusting channel or be separated from the pressure adjusting channel. According to the pressure regulating valve, in the initial state, the executing end can pull the valve rod, so that the valve rod can continuously shield the pressure regulating channel, and the sealing performance of the pressure regulating valve in the initial state is effectively improved; meanwhile, when the inlet pressure is smaller than the outlet pressure, the negative pressure can abut against the execution end, the valve rod is made to shield the pressure regulating channel under the pulling force effect of the execution end, and the phenomenon of backflow or internal leakage in the pressure regulating valve can be avoided.

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 present invention discloses a covered stent suitable for thoracic aortic aneurysm and thoracic aortic dissecting aneurysm, comprising a main stent and at least one group of movable stents, the main stent comprising a first cylindrical portion and a second cylindrical portion, a vertical partition is arranged in the first cylindrical portion, the vertical partition divides the first cylindrical portion into a first diversion cavity and a second diversion cavity, the cross-sectional area of ​​the first diversion cavity is larger than the cross-sectional area of ​​the second diversion cavity, the second cylindrical portion is integrally formed with the first cylindrical portion and communicated with the first diversion cavity, the movable stent comprises a connecting portion and a diversion portion, the connecting portion and the diversion portion are integrally formed, the connecting portion is arranged in the second diversion cavity, and is tightly fitted with the inner wall of the second diversion cavity. The stent can effectively solve the problem that the existing chimney stents are not tightly fitted between each other and between the chimney stent and the aorta, which is easy to cause blood leakage.

The utility model relates to the technical field of valves, and provides a pneumatic valve which comprises a valve body. The valve cover is fixedly connected to the valve body; the valve element is arranged in the valve cavity and is in sealing fit with the valve seat through opening; the lower end of the valve rod is connected with the valve element, and the upper end of the valve rod penetrates through the valve deck and then is connected with an actuator fixedly connected to the valve deck. Wherein sealing packing compacted by the valve cover is arranged between the valve body and the valve rod, the valve rod is sleeved with a corrugated pipe, and the two ends of the corrugated pipe are connected with the sealing packing and the valve element in an abutting mode respectively to form an elastic structure. The corrugated pipe is sleeved on the valve rod, and two ends of the corrugated pipe are respectively connected with the sealing filler and the valve core in an abutting manner, so that impact pressure of fluid can be buffered, action of the valve core is buffered, impact on the sealing filler is reduced, damage to the valve core can be effectively reduced, and sealing performance of the sealing filler is improved to avoid internal and external leakage. And zero leakage of the valve is ensured.

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 present invention provides a thoracic aortic covered stent, which relates to the field of medical devices. The proximal section of the main support frame of the main stent includes a wavy proximal stent ring, and at least two groups of fish-mouth stents that are integrally connected to the proximal stent ring and extend to the proximal side of the proximal stent ring; each group of fish-mouth stents includes two symmetrically arranged arc-shaped stent units; the planes where each arc-shaped stent unit is located are respectively inclined radially outward from the distal end to the proximal end along the main covering; the arc-shaped stent units of each adjacent group of fish-mouth stents cross each other in a grid shape, and each two intersecting arc-shaped stent units overlap each other. The thoracic aortic covered stent provided by the present invention has good radial support force, softness and elasticity, can avoid internal leakage, and avoid the proximal end of the stent irritating the inner wall of the blood vessel; it can also avoid the clamping of the branch stent, reduce the compression size of the integrated branch stent, and improve the tolerance of the misalignment between the opening of the embedded stent and the opening of the branch blood vessel.

The utility model relates to a jet pump structure convenient to assemble, which comprises a pump motor, a pump body and an impeller, the impeller is mounted on an output shaft of the pump motor, a guide vane is mounted on the impeller, the pump body is mounted at one end of the pump motor provided with the output shaft, an outlet is arranged above the upper side of the pump body, and the guide vane is mounted on the pump body. An inlet is formed in the end face of the pump body, a throat pipe assembly is installed between the middle of the guide vane and the interior of the pump body, the throat pipe assembly comprises a butt joint pipe base body, an inlet and outlet cavity and a clamping protrusion, one end of the butt joint pipe base body is in butt joint with the middle of the guide vane, the inlet and outlet cavity is formed in the other end of the butt joint pipe base body, and the clamping protrusion is connected with the butt joint pipe base body. An upper connecting plug communicated with the inlet is arranged on the inlet and outlet cavity, and a lower connecting plug communicated with the outlet is arranged in the middle of the inlet and outlet cavity. The utility model has the characteristics that the production cost is reduced, the assembly steps are simplified, the assembly efficiency is improved, and the inner leakage phenomenon is avoided.

The invention relates to an automobile hydraulic power steering gear which comprises a shell, a piston, a steering gear and at least two exhaust valves. The shell is provided with a containing cavity extending upwards in an inclined mode, a containing cavity communicating with the side portion of the containing cavity, an oil return channel located on the upper side of the containing cavity, and a first installation hole inclining towards the containing cavity and communicating with the oil return channel and the first cavity. The piston is installed in the containing cavity so that the containing cavity can be divided into a first cavity and a second cavity which are located at the upper end and the lower end of the piston, the first cavity is communicated with the containing cavity, and the piston is provided with a second installation hole communicated with the containing cavity and the second cavity in a penetrating mode. A rack is formed on the side portion, facing the containing cavity, of the piston. And the two exhaust valves are respectively mounted in the first mounting hole and the second mounting hole. Air in the first cavity, the second cavity and the containing cavity can be automatically and rapidly exhausted to the oil return channel through the two exhaust valves, then flows back and turns to the oil can, and then is diffused into the atmosphere.

The present invention provides a coated vascular stent with improved wall adhesion performance, which includes a coating and a main support frame arranged on the coating. The coated vascular stent also includes an expansion positioning piece arranged at the proximal end and / or distal end of the coating. After the coated vascular stent is subjected to radial compression, the radial supporting force of the expansion positioning piece can maintain the complete expansion of the proximal end and / or distal end of the coating, so that the coated vascular stent is sealed and fitted with the inner wall of the blood vessel to avoid internal leakage.

The invention discloses a postgres database encryption method and system based on an encryption card and a storage medium, and solves the problems that in an existing encryption mode, an encryption program is cracked, and data is drained before being stored in a database, so that the data is stolen. The method comprises the steps that a trigger monitors a data operation event in real time, and a user-defined encryption and decryption function is started; and obtaining the operation data through the user-defined encryption and decryption function, carrying out communication with the encryption card to carry out encryption and decryption operation on the operation data, and returning the data after the operation. According to the method, the encryption method and the postgres database are integrated by starting from the internal self-defined function of the postgres database, combining the encryption card and applying the function of the database trigger, non-inductive transparent encryption is realized, and the data security of the database is ensured. The method does not need to analyze the sql statement and traverse the syntax tree of the sql like calling a JDBC library, and is convenient to implement. The encrypted database is transparent to users and developers and is very convenient.

The utility model relates to the field of chemical production equipment, and discloses an internal leakage prevention pressurizing line which comprises a pressurizing pipeline body and a self-adaptive pressure balance valve fixedly connected to the outer surface of the rear end of the pressurizing pipeline body, and the outer surface of the left side of the pressurizing pipeline body is fixedly connected with a second pressurizing pipe. The outer surface of the left side of the second pressurizing pipe is fixedly connected with a flow control valve. The internal leakage prevention pressurizing line comprises a pressurizing pipeline, a multi-channel parallel pressurizing device and a self-adaptive pressure balance valve, the pressurizing pipeline is connected with an outlet of a C2 vaporizer and an inlet of an acetylene hydrogenation reactor and used for introducing mixed C2 into the reactor for pressurizing, and the multi-channel parallel pressurizing device is connected with the self-adaptive pressure balance valve. The multi-channel parallel pressurizing device is arranged on a pressurizing pipeline and comprises a plurality of pressurizing channels connected in parallel, each channel is provided with an independent flow control valve and a pressure monitoring point, the pressurizing flow and pressure of each channel can be adjusted according to needs, and uniform distribution of pressure in the reactor is achieved.

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.

The present invention provides an electronic expansion valve, comprising: a valve body, the valve body having a valve port; a valve head, movably arranged in the valve body, the valve head including a valve head and a compression sleeve, the valve head having a receiving cavity, the end of the receiving cavity close to the valve port having a bottom wall, the bottom wall having a through hole, the valve head being used to block the valve port; a guide sleeve, arranged in the valve body, the valve head being inserted in the guide sleeve; a driving part, movably arranged in the valve body, the end of the driving part passing through the compression sleeve, the end of the driving part and the compression sleeve having a channel, the channel, the receiving cavity and the through hole jointly forming a balancing channel passing through the valve head; an elastic member, arranged in the receiving cavity, one end of the elastic member cooperating with the bottom wall, the other end of the elastic member being able to be compressed by the end of the driving part; a sealing member, the sealing member being arranged between the valve head and the guide sleeve. The technical solution provided by the present invention can solve the problems of high manufacturing cost and large size of electronic expansion valves in the prior art.