253results about How to "Avoid seal failure" patented technology

The invention provides a double-row low-temperature safety valve and relates to the technical field of safety valves, the double-row low-temperature safety valve comprises a main valve body, a valve cover and a pilot valve assembly, an inlet runner and an outlet runner are arranged in the main valve body, a guide sleeve is arranged in the main valve body, a first valve element is arranged in the guide sleeve in a sliding mode, and a valve seat is arranged in the main valve body; a first sealing piece is arranged at the lower end of the first valve element, a medium containing cavity is formed between the first valve element and the valve deck and located in the guide sleeve, the pilot valve assembly is communicated with the medium containing cavity and the inlet flow channel, and the first sealing piece and the valve seat can elastically deform. The medium containing cavity is filled with media to form pressure towards the valve seat on the first valve element, so that the first sealing piece extrudes the valve seat. According to the safety valve, the first valve element and the valve seat can both deform, the sealing performance of the valve seat and the first valve element under the low-temperature working condition is guaranteed, and the sealing performance between the first valve element and the guide sleeve is remarkably improved.

The invention relates to a vacuum chamber for a high-altitude simulation test of a liquid rocket engine, belongs to the technical field of aerospace liquid rocket engine tests, and solves the technical problems of single function, difficulty in operation and poor safety of a traditional vacuum chamber. The cabin comprises a cabin body, a cabin door, a heat sink system, a fire fighting system, a gas replacement system, an anti-arch blasting device, a blowdown system, a mounting platform, an operation platform, a propellant supply pipeline and measurement and control equipment. The cabin body is cubic, and the working pressure in the cabin body is 0-0.1 MPa. The cabin door is used for entering and exiting of personnel, small ground equipment, an engine and a thrust measuring device. The heat sink system, the fire fighting system, the gas replacement system, the sewage discharge system, the mounting platform and the propellant supply pipeline are mounted on the cabin body, and the measurement and control equipment is a transmission channel for engine control and measurement signals. The vacuum chamber is used for a liquid rocket engine high-altitude simulation test.

The invention relates to the technical field of metal-air solid-state batteries, in particular to a thin-film metal-air battery with a three-dimensional structure, a layer of thin-film solid-state electrolyte structure is arranged between a negative electrode material and a breathing electrode, and the breathing electrode and the negative electrode material are folded and form a three-dimensional straight-hole folded plate structure. The three-dimensional straight-hole folded plate structures are uniformly provided with a plurality of Z-shaped through regular ordered holes, so that the weight of the three-dimensional straight-hole folded plate structures can be reduced to realize light weight, the three-dimensional straight-hole folded plate structures are mutually stacked, and the three-dimensional straight-hole folded plate structures are arranged in an air circulation area of the battery; honeycomb holes with high regularity are formed in the three-dimensional straight hole folded plate structure, and the structure is used in an air circulation area of the air battery, so that the contact surface area of air and an electrode can be greatly increased, which means that more oxygen can be in contact with the electrode at the same time, the supply efficiency of the oxygen is improved, and the reaction of the oxygen and the electrode is promoted.

The invention discloses a stepped self-adaptive high-pressure dynamic seal rotary table device, relates to the technical field of underwater radar rotary tables, can adapt to mutual switching of underwater radar deepwater work and water surface presetting, and can realize no leakage of the underwater radar rotary table during deepwater work. The stepped self-adaptive high-pressure dynamic sealing rotary table device comprises a mechanical sealing ring 1, a mechanical sealing ring 2,..., a mechanical sealing ring n, an oil injection nozzle, viscous pressure oil, a direction transmission device, a liquid leakage detection and discharge device, a rotary joint and the like. The radar rotary table has the following advantages: 1) the sealing pressure difference can be improved, and the underwater working depth of the radar rotary table is obviously increased; the sealing pressure difference is in positive correlation with the number of the multiple layers of mechanical sealing rings, and the more the rings are, the higher the pressure difference is; 3) the differential pressure can be distributed to each layer of mechanical sealing ring in a stepped and self-adaptive manner; 4) an outer layer auxiliary dynamic seal is added, so that the sealing reliability of the whole machine is improved; and (5) liquid leakage information and liquid leakage discharge can be monitored.

The present invention provides a magnetically closed and drainable water film-sealed and odor-proof floor drain core, which belongs to the technical field of drainage pipe systems. It solves the problems of the existing floor drain core structure design and distribution being complex, the poor sealing effect and the poor odor-proof performance, as well as the poor drainage volume and drainage effect. The magnetically closed and drainable water film-sealed and odor-proof floor drain core comprises a floor drain core body, the top of the floor drain core body being a water inlet, the bottom of the floor drain core body being a water outlet, a magnetically closed cover plate being movably connected at the water outlet of the floor drain core body, a soft sealing pad movably sealed with the water outlet being arranged on the magnetically closed cover plate, a limited portion being reversely connected to the movable connection end of the magnetically closed cover plate, a first permanent magnet being fixedly installed in the said limited portion, a magnetically active unit being arranged between the floor drain core body and the magnetically closed cover plate, and a connecting seat being arranged on the floor drain core body. The present invention has the advantages of ingenious structural design, good sealing effect, and good drainage volume and drainage effect.

The invention discloses a sealing, reinforcing and plugging process for a long-well-section large-drift-diameter expansion pipe, and relates to the technical field of oil field well pipe reinforcing and repairing. A plurality of rubber rings are attached to the outer side of the expansion pipe, and the rubber rings are arranged at equal intervals in the axis direction of the expansion pipe; on the outer wall of the expansion pipe, the section between every two adjacent rubber rings is coated with a thermosetting bonding layer; the outer diameter of the thermosetting bonding layer is smaller than that of the rubber ring. The thermosetting bonding layer is creatively arranged on the outer side of the expansion pipe, the structural strength of the expansion pipe is improved through the bonding effect of the bonding layer, the wall thickness of the expansion pipe is reduced, in other words, the inner diameter of the installed expansion pipe is enlarged, and therefore the application range of the expansion pipe plugging technology is expanded. Meanwhile, the technical scheme has the advantages of being long in plugging well section, good in sealing effect and low in single well construction cost.

The invention relates to the technical field of vertical submerged slurry pumps, in particular to a sealing-free vertical submerged double-suction pump structure for conveying halide salt and slurry, which comprises a double-suction shell, an upper water inlet is arranged on the upper portion of the double-suction shell, a lower water inlet is arranged on the lower portion of the double-suction shell, and the slurry enters from the upper end and the lower end of the double-suction shell. And a double-suction open type impeller is mounted in the double-suction shell. According to the structure of the non-sealing vertical submerged double-suction pump for conveying halide salt and slurry, a double-suction water inlet mode is adopted, the pressure is reduced due to the fact that liquid on the upper portion of the shell is sucked into the shell, the liquid cannot enter a bearing component on the upper portion, and therefore a sealing device is omitted. The design effectively avoids the problem of sealing failure caused by the fact that the upper portion of the shell needs to be sealed to prevent liquid from entering the bearing in a traditional single suction mode, and the reliability and the service life of the pump are greatly improved. The double-suction open type impeller is designed to be of an open type structure without a front cover plate and a rear cover plate, so that liquid cannot be accumulated in the impeller after shutdown.

The invention discloses an aluminum wood door and window capable of being automatically sealed, and belongs to the technical field of doors and windows, the aluminum wood door and window comprises an aluminum alloy outer frame, an inner frame and an inflation handle assembly, tight sealing of the door and window is achieved through cooperation of a magnetic attraction assembly and an automatic sealing assembly, and the door and window is provided with a magnetic cavity in which the magnetic attraction assembly is arranged; the inflation state can be controlled through the inflation handle assembly, then the penetrability of a magnetic field is adjusted, adsorption and release of the self-sealing assembly are achieved, the self-sealing assembly comprises a silica gel film layer and a sealing plate, the sealing plate is driven by magnetic force to move, and the silica gel film layer is made to be tightly attached to the aluminum alloy inner frame to achieve the sealing effect. The aluminum-wood door and window is easy and convenient to operate and excellent in sealing performance, rainwater permeation can be effectively prevented, the comfort and safety of the living environment are improved, and meanwhile a user can conveniently find and handle the water seepage problem in time.

This utility model discloses a multi-layer waterproof LED mini-lamp for vehicles, relating to the technical field of automotive LED mini-lamp. The multi-layer waterproof LED mini-lamp includes an LED mini-lamp body and a waterproof component including a first rain shield. A first limiting groove is formed on the surface of the LED mini-lamp body, and a second sealing gasket is installed inside the first limiting groove. Six first bolts are threaded into the internal part of the first rain shield. A second rain shield is located at the upper end of the LED mini-lamp body, and a second limiting groove is formed on the surface of the LED mini-lamp body. A third sealing gasket is installed inside the second limiting groove, and six second bolts are threaded into the internal part of the second rain shield. The first rain shield forms a first layer of liquid seal through the second sealing gasket, preventing rainwater from seeping in from the top gap. The second rain shield covers the outside of the first rain shield, and through the cooperation of the third sealing gasket and the second limiting groove, forms an outer physical barrier. Compared with the traditional single-layer structure's "one-to-all" failure mode, reliability is significantly improved.

The invention discloses a nonmetal composite hydrogen conveying hose with a multi-form hydrogen blocking layer, and belongs to the technical field of hydrogen conveying hoses, the nonmetal composite hydrogen conveying hose comprises an external pipe, the bottom end of the external pipe is connected with a butt-joint pipe, the bottom end of the butt-joint pipe is connected with a composite hose, the bottom end of the butt-joint pipe is connected with a first sleeve in a penetrating mode, and the top end of the butt-joint pipe is connected with a second sleeve in a penetrating mode; the first sleeve is sleeved on the outer wall of the composite hose, the second sleeve is sleeved on the outer wall of the external pipe, a cavity is arranged in the butt-joint pipe, and a sealing measuring assembly is slidably connected in the cavity of the butt-joint pipe. A complete hydrogen conveying structure is integrally formed by a composite hose, a butt joint pipe and an external pipe, the butt joint pipe is fixedly connected with the composite hose and the external pipe in a sleeving mode through a first sleeve and a second sleeve, an inner cavity provides an installation and sliding space for a test sealing assembly, and the composite hose is of a multi-layer composite structure of a hydrogen conveying pipe, a first hydrogen blocking layer and a second hydrogen blocking layer. And a multi-form hydrogen blocking system with double hydrogen blocking layers and a hydrogen transporting base layer is formed.

This utility model discloses a stainless steel storage tank with good sealing performance for chemical production, including a tank body. A sealing cover is provided on the top of the tank body for sealing. A driving pressing assembly is provided on the surface of the tank body. The driving pressing assembly is used to drive and press down the sealing cover, improving the sealing performance between the sealing cover and the tank body. A connecting rotating assembly is provided on the sealing cover. This utility model achieves automated pressing and releasing of the sealing cover through the driving pressing assembly, replacing the traditional one-by-one bolt tightening operation. The sealing ring at the bottom of the sealing cover, together with the annular positioning block and annular positioning groove at the top of the tank body, form a triple sealing structure. The annular positioning block is embedded in the annular positioning groove for precise positioning, preventing the sealing cover from shifting. The pressing plate applies uniform pressure through the driving pressing assembly, ensuring a tight fit between the sealing ring and the upper edge of the tank body, eliminating local gaps.

The invention discloses a liquid chlorine conveying corrugated pipe stop valve and a sealing method, the liquid chlorine conveying corrugated pipe stop valve comprises a valve body, a valve cover and a valve rod component, and further comprises a fixing piece, a first sealing component and a second sealing component, the fixing piece is located in the valve body and divides a valve cavity into an upper cavity and a lower cavity; the first sealing component is located in the lower cavity and provided with a first corrugated pipe. The first corrugated pipe is sleeved on the outer side of the valve rod component and is welded and connected between the fixing piece and the valve clack in a sealing manner; the valve rod part penetrates through the fixing piece; and the second sealing part is positioned in the upper cavity and is used for sealing the peripheral side of the valve rod part. According to the liquid chlorine conveying corrugated pipe stop valve and the sealing method, the structure is simple and compact, the overall sealing performance is improved through three-layer sealing of the valve cavity in the stop valve, and the situation that sealing fails due to long-time use of a single corrugated pipe is avoided; and the elastic sealing contact can compensate the abrasion and deformation of the valve clack and the valve seat after long-time use, so that the reduction of the sealing performance is avoided.

The utility model provides a kind of fire-fighting spray vertical support pipe quick alignment structure, it is related to pipeline alignment technical field, including support, multiple fixed force are provided on support along length direction, and fixed force is used for for horizontal pipe to pass through and is fixed to horizontal pipe;Infrared emitter is installed in one side of support, for emitting bar light, bar light forms optical path along vertical direction and is irradiated to tee, when rotating tee makes the casting line of its outer wall and vertical optical path coincide, then the side mouth of tee is in vertical state;Fixed force and infrared emitter are all installed on adjusting assembly, adjusting assembly can adjust the height of fixed force and infrared emitter and is fixed after adjustment.The utility model can be in ground assembly stage to tee and be aligned and fixed in unified direction, to ensure vertical support pipe installation consistency, avoid leakage risk caused by secondary tightening, and effectively improve overall installation efficiency.

The pot cover assembly comprises a cover body and an inner cover detachably fixed to the cover body, the inner cover comprises a cover plate and a sealing ring arranged on the periphery of the cover plate, the inner cover is provided with a first side and a second side, the cover plate protrudes towards the first side, and the sealing ring is arranged on the periphery of the cover plate. The sealing ring is provided with a first sealing lip located on the first side and a second sealing lip located on the second side, the inner cover has a first installation state in which the first side faces downwards and a second installation state in which the second side faces downwards, in the first installation state, the first sealing lip abuts against the pot body in a sealed mode, and in the second installation state, the second sealing lip abuts against the pot body in a sealed mode. The second sealing lip edge abuts against the pot body in a sealed mode. According to the electric cooker, the inner cover can be installed on the cover body in a positive posture and a negative posture, so that the volume of the cooking space is adjustable, a user can flexibly adjust the size of the cooking space according to different quantities of cooked food and different cooking food materials, and the pot overflowing phenomenon is effectively avoided while the heating efficiency is guaranteed.

The utility model discloses a battery cell top cover component and battery module, including top cover and upper insulator, wherein the top cover is equipped with mounting through hole and annular groove, mounting through hole is used for the pole to pass through, annular groove is arranged on the top surface of top cover and is constructed to surround the periphery of mounting through hole; the upper insulating part is provided with a sealing through hole and a fitting end face, the sealing through hole is used for being in sealing fit with the pole, the fitting end face is arranged on the side, facing the top cover, of the upper insulating part and is used for being bonded to the top face of the top cover through structural adhesive, an annular convex part is arranged on the fitting end face, and the annular convex part is constructed to be bonded to the annular groove in a matched mode. According to the battery cell top cover assembly, the waterproof sealing performance between the upper insulating part and the top cover can be greatly improved, and the problem that the battery cell top cover assembly is prone to battery cell sealing failure is solved.

The present application relates to the field of plunger pump, disclose a kind of slurry separation structure and plunger slurry pump, including pump body, flow guide pipe is equipped in pump body, the middle part of flow guide pipe is equipped with the isolation ring that follows plunger movement and moves up and down with action.Pumper upper part side end is equipped with plunger channel with medium oscillation cavity communication, plunger channel is connected with packing box, packing box is equipped with plunger, which can reciprocate transversely in plunger channel, flow guide pipe is located outside the lateral of plunger activity range.The present application can separate slurry medium, and effectively avoid the full turbulence of backwash medium and slurry medium, and plunger can be removed from the front end of pump body for maintenance, due to the existence of turbulence isolation ring, effectively shorten the size of pump body, improve the reliability of pump, maintainability, reduce manufacturing cost and improve the service life of spare parts.

The present invention discloses a time difference culture device, which relates to the technical field of biological tissue culture; the time difference culture box is adapted to be equipped with a light source assembly, an observation assembly and a gas supply system; the light source assembly includes a first light focusing part, a light decaying sheet is arranged on the light incident side of the first light focusing part, and the light decaying sheet is provided with a plurality of light transmitting parts in sequence along the length direction of the light decaying sheet, and the light transmittance of the plurality of light transmitting parts increases in sequence along the length direction of the light decaying sheet; the observation assembly includes a microscope camera and a linear drive mechanism; the gas supply system includes a first pressure switch, a first reversing pressure relief valve and a first gas storage tank, the first pressure switch is used to monitor the air pressure in the time difference culture box and control the action of the first reversing pressure relief valve, and the outlet of the first gas storage tank is connected to the inlet of the first reversing pressure relief valve after passing through a pressure reducing valve. The present invention can ensure the clarity of the captured image, and the image has a three-dimensional sense and a sense of hierarchy, so as to accurately judge the morphology of biological tissues and ensure the accuracy of biological tissue evaluation, analysis and screening.

This invention discloses an oil-water-gas well reservoir expansion and sealing jet fluid production and sand removal device, relating to the field of oil production technology. The device includes a central tube and further comprises: an expansion assembly located around the central tube, with its lower end positioned on the central tube and its upper end capable of sliding on the central tube, used for radial expansion under the drive of a hydrodynamic fluid; and a jet nozzle located below the central tube and below the expansion assembly, used to spray hydrodynamic fluid, creating a negative pressure zone in the spray area to absorb formation fluid. This integrated design combines the expansion assembly and the jet nozzle, allowing for the completion of both annular sealing and jet fluid production and sand removal functions in a single well run, avoiding the cumbersome process of two well runs required by traditional technologies and shortening the operation time.

The invention relates to the technical field of medical equipment, and provides a negative pressure transfer incubator which comprises a case, a constant temperature cover and an elastic inflation tube, the case is of a box body structure with an opening in the upper end, a continuous annular containing groove is formed in the upper end of the case, the constant temperature cover is of a cover body structure with an opening in the lower end, and the lower end of the constant temperature cover is matched with the containing groove; the lower end of the constant-temperature cover is used for being inserted into the containing groove, lock catch structures used for mutual connection are arranged on the outer wall of the constant-temperature cover and the outer wall of the machine box respectively, an air pump is arranged in the machine box and connected with an elastic inflation pipe, the elastic inflation pipe is connected into the containing groove, and when the constant-temperature cover and the machine box are in a connected state, the elastic inflation pipe is connected into the containing groove. And the elastic inflating pipe is positioned between the constant-temperature cover and the case. Through the multiple synergistic effects of guiding positioning, mechanical locking and active inflation sealing, the sealing reliability and adaptability of the main connecting face of the negative pressure transfer incubator are remarkably improved, and the stability of the internal negative pressure environment is effectively maintained.

The invention discloses a vacuum extrusion device for preparing titanium and titanium alloy, relates to the technical field of titanium and titanium alloy preparation, and aims at solving the problems that an existing device is prone to sealing failure, not thorough in cleaning and low in temperature control precision. The device comprises a vacuum chamber, an extrusion rod, an air passage system, an air source distributor, a temperature monitoring module and an external control module. The working section of the extrusion rod is provided with three sections of spiral grooves, and precise coupling of dynamic sealing, self-cleaning and temperature field regulation and control is achieved through cooperation of an air channel system and multiple air channels. The first section of main sealing spiral groove forms a high-pressure air curtain, the second section of temperature control spiral groove adjusts the temperature in a self-adaptive mode through a shape memory alloy ring, and the third section of cleaning spiral groove conducts deep cleaning through the reverse suction effect. And the external control module adaptively regulates and controls each gas path according to temperature and impurity concentration monitoring data, so that the structure is simplified, the efficiency is improved, the product quality stability is guaranteed, and the batch production requirements of high-quality titanium and titanium alloy are met.

The utility model discloses MC casting nylon reaction equipment which is characterized in that the MC casting nylon reaction equipment comprises a mounting platform and a reaction kettle, the reaction kettle is fixed on the mounting platform through a rotating support, the reaction kettle is further connected with a rotating power mechanism, and the rotating power mechanism pushes the reaction kettle to rotate and discharge along the rotating direction limited by the rotating support. A heating furnace is arranged on an installation platform at the bottom of the reaction kettle, a vacuum port, a feeding port and an air inlet are formed in the top of the reaction kettle, a discharging pipe is further arranged on one side, located at the bottom, of the surface of the reaction kettle, and ball valves are arranged on the discharging pipe, the feeding port and the air inlet. The device is high in automation degree, convenient and labor-saving to operate and capable of effectively improving the production efficiency.

The utility model discloses a heat distribution pipeline connecting structure which comprises a first pipe body and a second pipe body, spherical connecting pieces are coaxially and symmetrically arranged at the end of the first pipe body and the end of the second pipe body, and the outer surface of each spherical connecting piece is of a spherical crown-shaped structure. A short pipe is arranged between the first pipe body and the second pipe body, spherical connecting grooves matched with the spherical connecting pieces are formed in the two ends of the short pipe, the inner surfaces of the spherical connecting grooves are spherical surfaces with the curvature radius consistent with the curvature radius of the outer surfaces of the spherical connecting pieces, and the spherical connecting pieces are embedded into the spherical connecting grooves to form a multi-degree-of-freedom rotation pair. The combined structure of the spherical connecting piece and the split type short pipe is adopted, the multi-degree-of-freedom motion characteristic of a spherical pair is utilized, axial stretching, transverse dislocation and torsional composite displacement caused by seismic waves can be effectively absorbed, and the fracture risk caused by pipeline stress concentration is avoided. The split type short pipe is quickly assembled through bolt fastening, and the strict requirement of traditional interference fit for the installation technology is eliminated.

The utility model relates to an anti-leakage pipeline connecting device, which belongs to the technical field of pipeline connection and comprises a bottom plate and two groups of connecting structures arranged at the top of the bottom plate, and sealing structures used for performing tight anti-leakage treatment on the joint of two pipelines are arranged outside the two groups of connecting structures. The sealing structure comprises a corrugated pipe arranged outside the two connecting structures, and an annular air bag is fixedly installed in the corrugated pipe. According to the anti-leakage pipeline connecting device, a pull block is manually pulled to drive a plug rod and a plug plate to move outwards in a piston barrel, at the moment, negative pressure is formed in the piston barrel, external air enters the piston barrel through an air inlet pipe, the plug plate and the plug rod move inwards to extrude air in the piston barrel, the air enters an annular air bag through a conveying pipe, and the annular air bag is expanded; the sealing ring is tightly attached to the outer wall of the pipeline connecting position, a reliable sealing structure is formed, medium leakage is effectively prevented, and the advantage of being good in sealing performance is achieved.

The utility model discloses a valve with a stainless steel surfacing layer, which comprises a valve body, a valve cover, a valve rod and a valve core, the valve body is provided with a valve cavity, two sides of the valve body are provided with an inlet and an outlet which are communicated with the valve cavity, the valve cavity of the valve body is provided with a valve seat for dividing the inlet and the outlet, and the valve body is provided with a valve cover connecting part; the valve cover is detachably mounted on the valve cover connecting part of the valve body; the valve rod is in threaded connection with the valve cover, penetrates through the valve cover and extends into the valve cavity; the valve element is fixedly installed at the lower end of the valve rod and located in a valve cavity of the valve body, and a stainless steel surfacing layer is arranged at the joint of the valve element and the valve rod. The valve rod is suitable for driving the valve element to make contact with a valve seat in the valve cavity in a matched mode through rotation action, and the communication state between the inlet and the outlet is controlled through cooperation of the valve element and the valve seat. The service life of the valve can be prolonged, and meanwhile visual inspection of the abrasion state is achieved.

The invention discloses a small submersible electric pump, comprising a water pump casing fixed with a water outlet, a power line outlet and a handle, a motor, a water pump impeller, a guide shell and a water inlet bottom cover, a water passage between the motor side and the water pump casing, the water inlet bottom cover and the guide shell are connected together with the motor lower end cover by bottom cover bolts, a rubber sealing ring is provided between the upper end cover of the motor and the motor casing, the upper end cover is provided with a power line sealing fixing device and a sealing test hole, a connecting flange with two bolt holes is provided at the edge of the upper end cover port, a corresponding fixing code with two fixing screw holes is fixed on the side of the motor casing, the connection between the upper end cover and the motor casing and the connection between the motor and the top end of the water pump casing are connected together at different pairs of bolt holes and fixing screw holes by fixing bolts and long bolts respectively, the power line sealing fixing device extends from the power line outlet and is sealed by the sealing ring, so that water is prevented from entering the inside of the motor; the invention has the beneficial effects of improving the connection fixing sealing effect between the motor and the water pump casing and the power line fixing sealing effect and preventing sealing failure.

The utility model relates to the technical field of high-pressure flange ball valves, in particular to a sealing structure of a marine high-pressure flange ball valve, which comprises a valve body, an O-shaped ball valve and valve seats arranged on the left side and the right side of the O-shaped ball valve. The double-pole sealing mechanism comprises two symmetrically-distributed valve seat grooves formed in the valve body, the two valve seats are located in the two valve seat grooves correspondingly, supporting rings are fixedly connected to the interiors of the two valve seat grooves correspondingly, and a plurality of belleville springs distributed in an annular array are fixedly connected between the two supporting rings and the two valve seats correspondingly. The bipolar sealing mechanism abuts against the inner wall of the valve seat groove through a first sealing ring on the outer wall of the valve seat, and a second sealing ring on the inner wall is attached to the outer wall of the O-shaped ball valve, so that two independent and complementary sealing defense lines are formed. The design of double sealing can effectively prevent sudden leakage, and the high safety requirement of a ship system is met.

This invention provides a catheter assembly, a medical delivery device, and a system. The catheter assembly includes an outer tube, an inner tube, and a connecting mechanism. The outer tube is fitted onto a portion of the outer surface of the inner tube and is axially movable relative to the inner tube. The proximal end of the outer tube is sealed to the outer surface of the inner tube via the connecting mechanism. The inner tube includes an inner tube body, and a first limiting portion is provided on the outer surface of the inner tube body. The outer diameter of the first limiting portion is larger than the outer diameter of the inner tube body, and the first limiting portion is disposed within the outer tube. The connecting mechanism includes a first connecting portion and a second connecting portion connected to each other. The first connecting portion is disposed at the proximal end of the outer tube. The second connecting portion is movably fitted onto the inner tube body and is located on the proximal side of the first limiting portion. The second connecting portion is also used to abut against the first limiting portion when the inner tube moves a predetermined distance relative to the outer tube in a distal-to-proximal direction, thereby preventing the inner tube from continuing to move in the distal-to-proximal direction and avoiding separation of the inner tube and outer tube or damage to the seal between them.

The invention provides a fuel cell, a membrane electrode assembly and a preparation method thereof. The electrode assembly comprises an outer frame and an inner frame, the outer frame is arranged on the outer side of the gas diffusion layer, the outer frame and the gas diffusion layer are arranged at an interval, and the outer frame comprises a first outer frame and a second outer frame which clamp the edge of the catalyst layer coating film; the inner frame is arranged between the outer frame and the gas diffusion layer and comprises a first inner frame and a second inner frame which are positioned on two sides of the proton exchange membrane; the side faces, facing the gas diffusion layer, of the first outer frame and the second outer frame are each provided with a first recess, the side faces, facing the outer frame, of the two sub-layers are each provided with a second recess, one parts of the first inner frame and the second inner frame are located in the first recesses, and the other parts are located in the second recesses. The contact surface of the catalyst layer coating film and the outer frame and the contact surface of the gas diffusion layer and the inner frame are both glued, the catalyst layer coating film abuts against the contact surface of the inner frame, the membrane electrode assembly can effectively overcome the transverse stress, and the durability of the membrane electrode sealing frame is remarkably enhanced.

The invention relates to the technical field of degradable high polymer materials and disposable personal care products, and discloses a preparation process of a degradable high-barrier plastic film for a hair dyeing shawl, and the preparation process comprises the following steps: 1, preparing chitosan-dopamine grafted modified montmorillonite (CTS-DA-MMT): dispersing 5g of 20-30nm nano montmorillonite in a 2wt% acetic acid solution, and ultrasonically dispersing for 40 minutes by 200W; adding dopamine hydrochloride according to the ratio of montmorillonite to dopamine being 1: 0.2, adjusting the pH value to 8.5 by using 1mol / L NaOH, and carrying out stirring reaction at room temperature for 1 hour; adding chitosan according to the ratio of montmorillonite to chitosan being 1: 0.4, and stirring and reacting at the constant temperature of 50 DEG C for 3 hours; the pH is adjusted to 7.0 through 1 mol / L HCl, centrifugation is carried out for 15 min at the speed of 8000 r / min, washing is carried out three times through deionized water, vacuum drying is carried out for 8 h at the temperature of 60 DEG C, and the product is obtained. According to the preparation technology of the high-barrier plastic film for the degradable hair dyeing shawl, chemical grafting (instead of physical blending) of montmorillonite-dopamine-chitosan is achieved through catechol groups of dopamine, the problems of montmorillonite agglomeration and matrix compatibility are solved, and the degradable hair dyeing shawl is prepared. Meanwhile, through the dynamic adhesiveness of dopamine, the problem of barrier failure under dynamic stretching is solved.

The utility model relates to the technical field of smoke bullet, and disclose a smoke bullet, smoke bullet silica gel child lock and smoke bullet oil injection exhaust device, including bottom cover, the bottom cover is fixedly connected with oil absorption cotton in, the bottom cover inlays has the oil storehouse sealing silica gel, the oil absorption cotton is located between bottom cover and oil storehouse sealing silica gel, through the child lock silica gel and the exhaust groove design, compared with the cross groove gap natural exhaust mode, the exhaust groove specially designed provides independent and unobstructed discharge path for the gas in the smoke bullet, in the oil injection process, the tobacco tar enters the tobacco tar storehouse under the action of oil injection pressure, the internal gas can be through the exhaust groove fast, directional discharge, avoid the gas accumulation in the storehouse and form high pressure, the above structured exhaust design can accurately match the oil injection rate, ensure that the gas discharge and tobacco tar injection are synchronous, eliminate the tobacco tar extrusion into the atomizing core problem caused by the poor exhaust from the root, make the oil injection process more stable, controllable.