184results about How to "Guaranteed sealing reliability" patented technology

The invention provides a compact self-sealing valve which is characterized in that a valve unit is configured to comprise a valve body and a plug, the valve body is provided with an oil duct, a first containing cavity and a second containing cavity which are communicated, the plug is provided with a first fuel oil flowing channel and a polygonal groove, and a sealing unit comprises a sealing jacket nut and a sealing valve element. The oil discharging unit comprises an oil discharging jacket nut, an oil discharging valve element, a connecting rod and a polygonal plug, the connecting rod is provided with a second fuel oil flowing channel, when the compact type self-sealing valve is in a closed state, the plug blocks the oil channel, the sealing jacket nut presses the sealing valve element, and when the compact type self-sealing valve is in an oil discharging state, the oil discharging valve element is arranged in the second containing cavity. The oil discharge jacket nut is used for pressing the oil discharge valve element, the plug is separated from the oil duct, and oil flows out of the oil duct. By means of the technical scheme, the problems that in the prior art, a valve is complex in structure, large in occupied space and poor in sealing performance are solved.

The invention relates to a high-reliability leakage-free rotary fluid connector which comprises a fixed shell and a rotary shell, the fixed shell and the rotary shell form rotary connection at the connecting end in a hole shaft mode, a sealing sleeve and a bearing are arranged on a step shaft of the rotary shell, the sealing sleeve is provided with double-side sealing, a movable sealing ring is installed on the inner side of the sealing sleeve and makes sealing contact with the step shaft, and the bearing is arranged on the bearing. The sealing performance in the under-pressure rotating process is fully guaranteed through the arrangement of multi-stage sealing and the spring plug ring, the bearing is used as a rotating supporting assembly and matched with the sealing sleeve, reliable supporting is formed on the rotating shell, rotating resistance is reduced, and the positioning precision and coaxiality are improved. Abrasion caused by deflection in the rotating process is prevented, and the service life is prolonged.

The invention discloses a transmitter based on large cabin liquid level sensing, and relates to the technical field of transmitters. The device comprises a lower flange, an upper flange is fixed above the lower flange, six fixing blocks are arranged between the lower flange and the upper flange, and fastening assemblies corresponding to the six fixing blocks are arranged on the edge of the lower flange and the edge of the upper flange. Through the arrangement of the lower flange and the upper flange, a pressure guide cavity completely isolated from the outside is formed in the transmitter, the sealing reliability of the transmitter can be ensured by utilizing the two layers of sealants, when parts in the lower flange or the upper flange are damaged, the parts can be disassembled in time for partial replacement, the purchase cost and the repair cost are greatly saved, and the production efficiency is improved. In addition, the filter screen is arranged below the pressure guide hole, and the blocked filter screen can be cleaned in time by using the push plate and the cleaning rod, so that the situation that an unknown object blocks the pressure guide hole or collides with the pressure sensitive element through the pressure guide hole to trigger an error signal is greatly reduced, and the accuracy is further improved.

The utility model relates to cable connection protection technical field discloses a sheath pipe structure for two cable joints, including upper casing, the outer wall fixed connection of upper casing has the connecting barrel, the inner wall rotationally connected with press column of connecting barrel, the lower surface fixed connection of press column has rotary column, the inside fixed connection of rotary column has the card post, the outer wall sliding connection of card post has the limit block, the outer wall fixed connection of limit block has lower casing, the inner wall fixed connection of connecting barrel has the limit piece, the outer wall sliding connection of rotary column has the spring. In the utility model, through the mutual cooperation between upper casing, connecting barrel, press column, rotary column, card post, limit block, limit piece, spring and lower casing, can greatly promote installation and maintenance efficiency, significantly reduce construction time and manpower cost, can simplify operation procedure simultaneously, reduce the dependence on professional tool and complex skill, reduce installation error risk.

This utility model relates to the technical field of engineering construction, and in particular to a drainage channel structure for expansion joints. It includes: an inter-column drainage channel, disposed between adjacent structural columns, with an inter-column connecting plate; clearance grooves are provided on the sides of adjacent structural columns; the inter-column connecting plate is fixedly connected to a structural beam and embedded in the clearance groove; a first inter-beam drainage channel and a second inter-beam drainage channel are respectively disposed at both ends of the inter-column drainage channel, both disposed between adjacent structural beams; each inter-beam drainage channel has a beam bottom connecting plate, fixedly connected to the bottom of the structural beam; the first inter-beam drainage channel, the inter-column drainage channel, and the second inter-beam drainage channel overlap sequentially to form a slope and are interconnected; an expansion joint waterproofing strip is provided between the beam bottom connecting plate and the bottom of the structural beam. This application has the effect of forming a second line of defense against water seepage in expansion joints, preventing indoor water seepage.

The invention provides a battery cover plate and a power battery, and the battery cover plate comprises a light cover plate which is provided with a pole hole and a connecting hole, and the pole hole and the connecting hole vertically penetrate through the light cover plate; the pole is arranged in the pole hole; the lower plastic is arranged at the bottom of the light cover plate and is provided with a connecting part, the connecting part is arranged in the connecting hole, and the connecting part is provided with a liquid injection port; and the sealing column is inserted into the liquid injection opening, the sealing column is in interference fit with the liquid injection opening, and the sealing column can be separated from the liquid injection opening under the action of pressure difference under the condition that the pressure intensity in the power battery is greater than the environmental pressure intensity. The sealing column can play a role in sealing the liquid injection opening, welding is not needed, the situation that the whole battery cover plate is scrapped due to the welding quality problem is avoided, meanwhile, under the situation that the pressure intensity in the power battery is larger than the environment pressure intensity, the sealing column can be separated from the liquid injection opening under the pressure difference effect, and the sealing effect is good. Therefore, gas in the power battery can be released to the outside through the liquid injection port, the pressure relief effect is achieved, and an anti-explosion valve does not need to be additionally arranged.

The utility model relates to the technical field of grouting pipe, concretely to a foundation pit plugging grouting pipe, including the pipe body, the surface fixed mounting of pipe body has the connecting pipe and the pipe sharp head, the surface of pipe body is established grouting hole, through setting up the sliding cover screw rod, the sliding cover, the pressing plate screw rod, the filter plate, the pressing plate, the pressure -bearing plate, utilize the synergies of these structures, the sliding cover screw rod drives the sliding cover to slide, the sliding cover is closely combined with the pipe body when closing, prevents the slurry overflow to block the external impurity infiltration, when opening, it is convenient for the filter plate to take out quickly and clean or replace, the filter plate is closely combined with the pressure -bearing plate by the pressing plate screw rod, the filter plate provides stable support with the help of pressure -bearing plate, avoids the filter plate to shift under the slurry impact, also can let the filter plate accurate filtration particle impurity in the slurry, prevents the pipeline blockage, guarantees the grouting pressure stability and grouting passage smooth, has simplified the equipment maintenance process, has promoted the efficiency and reliability of foundation pit plugging grouting construction.

The present application relates to a heat management system and a battery, comprising a heat exchange assembly and a turbulence assembly, the heat exchange assembly comprising heat exchange components, a plurality of heat exchange flow channels are formed on the heat exchange components, the plurality of heat exchange flow channels are sequentially arranged along a first direction, and the heat exchange flow channels are used to arrange heat exchange medium; the turbulence assembly is arranged in the heat exchange flow channels, the turbulence assembly comprises a plurality of turbulence components, and the plurality of turbulence components are sequentially arranged along a second direction; at least one turbulence unit is arranged on each turbulence component; when the same turbulence component is provided with a plurality of turbulence units, the plurality of turbulence units are sequentially arranged along the first direction, and each turbulence unit is arranged in different heat exchange flow channels; at least one turbulence hole is arranged on each turbulence unit, and when the same turbulence unit is provided with a plurality of turbulence holes, the plurality of turbulence holes are sequentially arranged along the first direction. The present application changes the flow direction and state of the heat exchange medium by arranging the turbulence assembly, improves the efficiency of convective heat exchange, and meets the uniform temperature requirement.

The utility model discloses an electric steamer with an outer water tank, which comprises a base, a steamer assembly arranged on the base and the outer water tank, a steam generating cavity is arranged in the base, a water outlet is arranged on the wall of the outer water tank, a water inlet is arranged on the wall of the steam generating cavity, a connecting pipe is arranged between the water outlet and the water inlet, and the outer water tank is arranged on the outer water tank. The connecting pipe is a flexible sealing pipe, one end of the flexible sealing pipe is connected with the wall of the outer water tank in a sealed mode, and the other end of the flexible sealing pipe is connected with the wall of the steam generating cavity in a sealed mode. According to the electric steamer, the flexible sealing pipe is connected between the outer water tank and the wall portion of the steam generating cavity in a sealed mode, sealing reliability can be guaranteed, a sealing ring is omitted, meanwhile, the machining difficulty of the outer water tank is lowered, the requirement for the coaxiality of the connecting pipe, the water outlet and the water inlet is lowered, the error-tolerant rate deviation is high, and the service life of the electric steamer is prolonged. And the connecting pipe is easy to disassemble and assemble.

The present application relates to the technical field of pipeline plugging, and provides a pipeline plugging robot, the open end of a first mounting cylinder is inserted along the axial direction of the open end of a second mounting cylinder, and the open end of the second mounting cylinder is simultaneously inserted into a preset slot of the first mounting cylinder as the insertion action advances, forming a nested structure in which the second mounting cylinder wraps the open end of the first mounting cylinder; at this time, the outer wall of the first mounting cylinder is tightly attached to the inner wall of the second mounting cylinder; the inner wall of the extrusion sleeve is tightly attached to the outer wall of the second mounting cylinder, further sealingly constraining the outer periphery of the second mounting cylinder, and preventing the medium inside the pipeline from entering the first mounting cylinder and the second mounting cylinder. During the rotation of the anchoring motor, the slips are driven to move along the radial direction of the second mounting cylinder through the first transmission assembly, and the slips can pass through the channel one by one during the movement, and drive the closure plate to realize reinforced sealing of the channel.

The utility model discloses a valve assembly and air conditioner with it, valve assembly includes: valve island, the first flow passage is formed in the valve island, and the valve island has the opening in communication with the first flow passage, functional component, functional component is detachably arranged at the opening, and the sealing ring is arranged between functional component and the valve island, one of valve island and functional component has the convex part, and the other of valve island and functional component is in contact with the convex part, and the convex part is annular along the circumferential direction of the opening. According to the valve assembly of the utility model, through the sealing ring between functional component and the valve island, one of valve island and functional component has the convex part, the other of valve island and functional component is in contact with the convex part, and the convex part is annular along the circumferential direction of the opening, can guarantee the sealing reliability between functional component and the valve island through double sealing, avoid valve assembly leakage, guarantee the reliability and stability of valve assembly, reduce the maintenance frequency of valve assembly, prolong the service life of valve assembly.

The application discloses a transformer for extra-high voltage direct current transmission engineering and relates to the technical field of transformers, in particular to a transformer for extra-high voltage direct current transmission engineering. The transformer comprises a transformer body, an oil tank arranged in the transformer body, a drain valve pipe communicated with the oil tank and mounted on one side of the transformer body, a main flow guide pipe connected with one end of the drain valve pipe, and a drain valve component and a sampling mechanism arranged at two ends of the main flow guide pipe. The transformer for extra-high voltage direct current transmission engineering is provided with the sampling mechanism. When sampling, the sampling pipe body is automatically moved up to the main flow guide pipe in an arc-shaped notch opened by itself and covered by a composite sealing ring under the transmission of the lifting transmission assembly, and then the clean oil sample in the main flow guide pipe enters the inside of the sampling pipe body along the cylinder wall of the sampling pipe body in a wall layer flow, so that air is avoided from being sucked by free jet flow. In the oil inlet process, the oil pressure pushes the piston rod in the buffer assembly to move down synchronously, and the gas in the sampling pipe body is discharged through the associated second electromagnetic valve pipe, so that the detection requirement of low-bubble sampling is met.

The utility model belongs to the technical field of bearings, and discloses a bearing assembly and a lifting wheel mechanism. The bearing assembly comprises a transmission shaft and a bearing, the transmission shaft is sleeved with the bearing, the transmission shaft is provided with an oil injection port, an oil outlet and an oil guide channel communicating the oil injection port with the oil outlet, and at least part of the oil outlet right faces the bearing so that lubricating oil can enter the bearing from the oil outlet. When the bearing needs to be lubricated, all parts located above the bearing do not need to be disassembled, and only the parts located above the oil injection port need to be disassembled, so that the number of the parts needing to be disassembled on equipment during oil filling can be reduced, the oil filling convenience is improved, and a large amount of manpower and time are saved; and the overall sealing reliability of production equipment can be ensured.

The invention relates to the technical field of fluid conveying, and discloses a double-channel fluid connecting device which is characterized in that a fixing part is provided with a first pipeline and a second pipeline; the first pipeline is provided with a first butt joint opening, the second pipeline is provided with a second butt joint opening, and the second butt joint opening is coaxially arranged in the first butt joint opening in a sleeved mode. A first annular channel is formed between the second butt joint port and the first butt joint port; the movable part is provided with a third pipeline and a fourth pipeline; the third pipeline is provided with a third butt joint port, the fourth pipeline is provided with a fourth butt joint port, and the fourth butt joint port is coaxially sleeved with the third butt joint port; a second annular channel is formed between the fourth butt joint port and the third butt joint port; one path of fluid is transmitted through the second pipeline, the second butt-joint opening and the fourth butt-joint opening; and the other path of fluid is conveyed through the first pipeline, the first annular channel, the second annular channel and the third pipeline. Rapid butt joint of two paths of fluid is achieved, the two paths of butt joint faces are coaxially designed, and the butt joint precision requirement is lowered.

The application relates to the technical field of denture grinding, and discloses a denture grinding device which comprises a grinding assembly, a water tank and a water outlet docking device. The grinding assembly is used for grinding a denture; the water tank is connected with the grinding assembly through a water channel; the water outlet docking device is arranged on the water channel and connected with the water tank, and comprises a water outlet channel and a spherical body arranged in the water outlet channel and capable of linearly sliding in a water outlet direction. When the spherical body is located at an initial position, the water outlet docking device is in an unpropelled state, and the spherical body prevents water in the water tank from flowing out of the water outlet channel; when the spherical body linearly slides away from the initial position, the water outlet docking device is in a propelled state, the water in the water tank can flow out of the water outlet channel, and the spherical body is subjected to an elastic force which makes the spherical body return to at least the initial position. Compared with a plane seal, the spherical body is more suitable for water quality changes, and even if there is slight ceramic dust, the soft property of the spherical body can push the dust out and tightly block the water outlet during the sliding process, so that the sealing reliability is ensured.

This application relates to the field of carding technology, specifically to a carding device for cotton sliver processing. The device includes a housing, with a needle roller, a stripping roller, and an output roller arranged inside the housing. The stripping roller and output roller are located on the left and right sides of the needle roller, respectively. A circulating belt is located on the upper part of the inner side of the housing, above the needle roller. A base is fixedly connected to the bottom of the inner side of the housing, below the needle roller, stripping roller, and output roller. A self-clogging mechanism for impurity removal is installed on the base. This invention uses a vacuum pump to generate negative pressure, which can efficiently remove impurities and short fibers generated during the carding process. An electric push rod controls the raising and lowering of the plug, achieving sealing of the dust collection cavity and rapid slag removal. Furthermore, the design of the guide sleeve and guide rod ensures the smoothness of the plug's movement and the reliability of the seal, preventing gas backflow after sealing and preventing the backflowing air from re-adhering impurities to the cotton sliver.

The utility model relates to an automatic exhaust structure of a material pressing machine, which comprises a valve seat, a valve core and a guide flat gasket, the valve core is composed of a connecting rod and a valve core block fixed at the bottom end of the connecting rod, the valve core block is composed of an upper small round block and a lower large round block, an annular mounting groove is arranged on the periphery of the upper small round block, an O-shaped sealing ring is arranged in the annular mounting groove, and the guide flat gasket is arranged in the O-shaped sealing ring. The valve seat is of a cylindrical structure with middle holes, the guide flat gasket is installed at the top end of the valve seat, the middle holes in the two sides of the guide flat gasket form exhaust ports, the top end of a connecting rod of the valve element penetrates through the guide flat gasket, the connecting rod is installed on the guide flat gasket through a positioning pin, and an air inlet is formed in the lower end in the valve seat and sequentially comprises a small equal-diameter hole, a conical hole and a large equal-diameter hole from top to bottom. According to the structure, the O-shaped sealing ring installed on the valve element and the valve seat are sealed in a taper fit mode, the sealing effect is good, the valve element is fast and reliable to open and close, the structure is simple, maintenance and repair are easy, the valve element is easy and convenient to disassemble and assemble, and materials are easy and fast to disassemble and clean.

The invention relates to a shock tube detonation test visualization device and a test method thereof, and the device comprises a shock tube which is sequentially divided into a premixing section, a detonation section, a development section and a measurement section along the axial direction, and the measurement section is provided with a plurality of optical visualization windows; the gas distribution ignition system is used for filling combustible premixed gas into the shock tube and generating a controllable ignition source at the detonation section; the synchronous signal acquisition system is used for acquiring a flame front position signal in the shock tube in real time; the schlieren system is used for acquiring a two-dimensional transient density gradient field of the shock wave and the flame front; the laser-induced fluorescence system is used for carrying out two-dimensional plane laser-induced fluorescence imaging on the flame reaction area; the high-speed photographing system is used for recording the overall propagation process of the flame in the shock tube; and the smoke grain acquisition unit is used for forming a smoke film on the inner wall of the measurement section to capture and retain the detonation cell structure. Compared with the prior art, the detonation wave three-dimensional structure and array surface change characteristics can be captured and observed at the same time through one detonation test.

The present invention relates to the field of etching processing equipment, and specifically to an etching liquid cooling device for an etching machine, which includes a shell, the shell includes a first square frame and a second square frame with an open structure at one end, the open end of the first square frame is sleeved in the second square frame, and is slidably matched and sealed with the second square frame, and a heat exchange plate for cooling the etching liquid is arranged in the shell. The present invention can reduce the pressure difference inside and outside the heat exchange channel by compressing the shell, improve the problem of sealing failure between the heat exchange plates, enhance the resistance of the heat exchange channel to instantaneous impact, and meet the use requirements of different working conditions; by arranging a plurality of closed independent chambers in the shell, the fine control of the pressure in each independent chamber is realized to adapt to the actual working condition where the pressure in the heat exchange channel gradually decreases from the liquid inlet to the liquid outlet, and further ensures the sealing reliability of the heat exchange channel; the setting of the vacuum chamber enables the shell to have a heat preservation function, reducing the cold energy consumption of the coolant.

The utility model discloses a hard sealing eccentric semi-ball valve, which comprises a valve body, an upper valve rod, a lower valve rod, a semi-ball valve core and a valve seat, the upper valve rod and the lower valve rod are respectively arranged at the upper end and the lower end of the valve body, the inner end of the upper valve rod is in linkage connection with the semi-ball valve core, and the inner end of the lower valve rod is in rotating connection with the semi-ball valve core; the valve further comprises a locking assembly used for locking the valve seat in the valve body, the locking assembly comprises a pressing ring, a plurality of sliding blocks are arranged on the periphery of the pressing ring, a mounting groove extending inwards is formed in one end of the valve body, a mounting part is arranged on the valve seat, the mounting part is arranged in the mounting groove, and a plurality of locking sliding ways with the number equal to that of the sliding blocks are arranged on the inner side of the mounting groove in the circumferential direction. The end of the valve body is further provided with an inlet and outlet used for allowing the corresponding sliding block to slide into the locking slide way, and when the sliding block slides into the locking slide way, the mounting part of the valve seat is pressed at the inner end of the mounting groove. According to the utility model, the stability of the valve seat mounting structure is obviously improved, the condition of medium leakage caused by looseness of the valve seat can be avoided, and the use is safer and more reliable.

The utility model provides a sanitary fast-assembly clamp assembly. The sanitary fast-assembly clamp assembly comprises two connectors, a clamp for locking the two connectors and a V-shaped sealing ring located between the two connectors. The V-shaped sealing ring comprises tip parts extending in the upper direction and the lower direction and plane parts extending in the left direction and the right direction, sealing grooves are formed in the abutting faces of the connectors, the plane parts are extruded by the abutting faces of the two connectors, and the tip parts are located in the sealing grooves and extruded by the sealing grooves. According to the sanitary fast-assembling clamp assembly, the V-shaped sealing ring is adopted to replace a plane sealing gasket, the sealing effect is better, the tip end of the V-shaped sealing ring is squeezed by the sealing groove, the contact area between the tip end of the V-shaped sealing ring and the sealing groove is greatly reduced, after the sealing face of the connector is twisted due to welding deformation, the V-shaped sealing ring can conduct displacement compensation according to a gap, and the sealing effect is better. The sealing reliability is ensured.

This utility model discloses a quick-change gripper main plate, including a quick-change plate and a working plate. Both the quick-change plate and the working plate have several evenly arranged air channels inside. Connecting air nozzles communicating with the air channels are fixedly connected to the outer walls of both the quick-change plate and the working plate. A mounting block for docking with a robot is fixedly connected to the surface of the quick-change plate. A hanging plate is fixedly connected to the inner wall of the quick-change plate, and several evenly arranged steel balls are movably connected to the side wall of the hanging plate. A piston sleeve is movably connected to the inner wall of the quick-change plate, and a piston rod is engaged with the inner wall of the piston sleeve. This utility model achieves quick gripper replacement through a gas-driven piston and steel ball engagement structure, eliminating the need for complex tools and significantly improving the gripper replacement efficiency of industrial robots. Furthermore, the self-locking steel balls prevent the gripper from falling off in case of abnormal air pressure, combining advantages such as high efficiency, reliability, safety, and flexibility.

The utility model discloses an electric saucepan, which comprises a base, a steaming drawer assembly and a water tank, the steaming drawer assembly and the water tank are arranged on the base, a mounting groove for mounting the water tank is arranged on one side of the steaming drawer assembly on the base, a water retaining rib is further arranged on the upper surface of the base, and the water retaining rib comprises a first water retaining section positioned between the water tank and the steaming drawer assembly, and a second water retaining section positioned between the water tank and the steaming drawer assembly. A first water receiving groove is formed between the first water retaining section and the side, facing the steaming drawer assembly, of the water tank, and the first water receiving groove is used for collecting water dripping from the surface of the side, facing the steaming drawer assembly, of the water tank. According to the electric steamer, the condensate water dripping from the surface of the side, facing the steaming drawer assembly, of the water tank can be collected, the condensate water is prevented from scattering and flowing all around and flowing to the control panel, and therefore the use experience is improved, and potential safety hazards are reduced.

The utility model discloses a kind of sealing structure and the 90 degree junction box of double cable of base assembly, comprising: base assembly, upper cover assembly and second screw, the second plane is formed on base assembly upper end face, and threaded hole is formed on it symmetrically;The utility model is matched with the T type limiting boss of sealing ring by the gap of outer circumferential surface lower part, and the limitation of sealing ring circumferential rotation and axial displacement is cleverly realized.Specially, limiting boss is designed as six and is reasonably distributed along square sealing ring, ensure that sealing ring is evenly stressed, will not be loose in any direction, to solve the problem that sealing ring is offset and leads to sealing failure due to vibration or assembly error, realize accurate, stable multistage limiting of sealing ring, effectively prevent offset and twist, ensure sealing reliability.

This specification discloses a heat dissipation system for an unmanned aerial vehicle (UAV), including a heat dissipation frame, an air duct cover, a cooling fan, and a dust filter. The heat dissipation frame is made of metal and includes a heat dissipation air duct body (with a first heat dissipation fin on its inner wall, overlapping the position of the air duct cover) and an outer mounting platform. The top is sealed by a first sealing gasket, and the bottom by a second sealing gasket, forming a sealed cavity. An air inlet is located at the front end of the heat dissipation air duct body, protected from water seepage by the sealing gasket. The air duct cover is fixed to the top of the frame by the sealing gasket, with a thermally conductive contact surface on its upper surface and a second heat dissipation fin on its lower surface, forming a heat dissipation path with the first heat dissipation fin. A dust filter is installed at the rear exhaust port of the heat dissipation frame, and the cooling fan is fixed to the air inlet, driving cool air to exchange heat through the two heat dissipation fins before exhausting it from the exhaust port.

The application discloses a pre-buried adjustable expansion depth expansion bolt assembly and belongs to the technical field of expansion bolts, which comprises a spring pad, a flat pad, a pre-buried sleeve, a hexagonal nut, an expansion sleeve, an expansion cone, an adjusting screw rod and a sealing end cover. In order to overcome the defects of the prior art, such as the damage to the concrete structure and the internal steel bars caused by the post-construction of the expansion bolt, the fixed and unadjustable expansion depth of the pre-buried anchor bolt, the jamming of the adjusting mechanism caused by the cement seepage due to the unreliable sealing of the plastic film during the pouring process, and the loosening of the anchoring force under long-term vibration, the application provides the pre-buried adjustable expansion depth expansion bolt assembly, so that the expansion depth of the expansion bolt on the market can be flexibly adjusted according to the actual wall thickness or the size of the decorative layer under the premise of pre-buried installation, the problems of the poor stability of the sealing end cover during the pouring process, the cement leakage caused by the poor stability of the sealing end cover, the single anchoring force between the expansion sleeve and the concrete and the insufficient long-term reliability of the expansion sleeve and the concrete are solved.

The electronic expansion valve structure comprises a valve body assembly, the valve body assembly comprises a valve seat part, a nut assembly and a valve needle part, the valve needle part comprises a large valve needle assembly and a small valve needle assembly, the small valve needle assembly is connected with the large valve needle assembly in an axial displacement mode, and the nut assembly is connected with the small valve needle assembly in an axial displacement mode. A large pressing sleeve used for axially limiting the small valve needle assembly is arranged on the large valve needle assembly, a valve element and a rotor which are coaxially arranged are arranged in the shell, a compression spring is arranged in the valve seat component, and the valve needle component is sleeved with the compression spring. One end of the compression spring is in contact with the nut assembly, and the other end of the compression spring is in contact with the large pressing sleeve. The sealing performance of the large valve port of the electronic expansion valve and the action reliability of a switch valve can be effectively improved, and the electronic expansion valve has the advantages of being few in part and simple and reliable in assembly process.

The pipe joint comprises an upper portion, a middle portion and a lower portion, and the upper portion, the middle portion and the lower portion jointly form a through circulation channel. An annular insertion block is arranged on the top face of the upper portion, a circle of platform is arranged on the periphery of the annular insertion block, a sunken solder groove is formed in the side, close to the annular insertion block, of the surface of the platform, and dual positioning of the annular insertion block and the platform facilitates reduction of welding alignment errors. A plurality of through screw holes are formed in the lower part; the outer diameter of the cylindrical structure where the first vertical face is located is larger than the outer diameter of the middle portion and smaller than the outer diameter of the lower portion, the middle portion is concave inwards relative to the upper portion and the lower portion, and the concave structure of the middle portion serves as a thermal expansion buffer area and is matched with smooth transition of the first inclined face, so that the welding thermal stress concentration coefficient can be effectively reduced, thermal deformation is reduced, and the welding seam cracking rate is reduced. According to the pipe joint for the plate heat exchanger, through the stepped axial structure, a multi-stage positioning reference and stress dispersion system is formed, and the comprehensive performance of the pipe joint can be remarkably improved.

This utility model relates to a novel diaphragm solenoid valve for an inkjet printer, comprising a valve body, valve cores on both the left and right sides of the valve body, and control components for controlling the left and right movement of the valve cores. An ink outlet channel extending through one side of the outer wall is provided in the middle of the valve body. Ink inlet channels extending through the outer wall are provided on both the left and right sides of the ink outlet channel. An ink inlet port is provided between the ink inlet channel and the ink outlet channel. A valve core movable cavity is provided at both the left and right ends of the valve body. A plug port communicating with the valve core movable cavity is provided on the opposite side of the ink inlet port in the ink inlet channel. One end of the valve core is movably fitted within the valve core movable cavity. The valve core includes a valve core abutment that passes through the plug port and enters the ink inlet channel. The valve core abutment is used to seal the ink inlet port under the control of the control components. A sealing mechanism is provided between the valve core abutment and the plug port. This application, by optimizing the valve body structure, shortens the ink flow path length inside the solenoid valve and reduces the ink retention volume.