50results about How to "Good self-sealing" patented technology

The invention provides a trocar for penetrating body tissue and being placed, which allows for shortening the time required to seal an opening, regardless of the size of the opening. In a first trocar used in performing surgery, an incision member is detachably inserted into the cannula portion and a cutting blade with a shape of a nearly straight line is formed at the tip. In a second trocar, the tip part of the cannula portion that detachably inserts the incision member has a slanting cut end, and the slanting cut end is formed in a tapered shape.

The invention discloses a marine-corrosion/hot-corrosion-resistant composite coating and a preparation method thereof, belonging to the technical field of metal surface protection. A novel FeCrAlRe hot-corrosion-resistant powder core wire material is prepared by coating mixed powder, containing Cr powder, Al powder and the like, on a carbon steel band. A ZnAlMgRe powder core wire material is prepared by coating mixed powder, containing Al, Mg, Zn and Re, on a Zn-base alloy band. The preparation method of the composite coating comprises the following steps: spraying the FeCrAlRe powder core wire material by using a high-speed arc spraying device to form an alloy coating on a pretreated steel base surface, and spraying a ZnAlMgRe coating to form a double-layer composite structure protective coating. The prepared coating can resist hot corrosion, and has excellent corrosion resistance in a marine high-humidity high-salt-mist environment.

The invention discloses a metal seal three-eccentric center butterfly valve. The valve is characterized in that the inner diameter of a metal seal ring is larger than the diameter of a mounting boss,a floating space is formed between the metal seal ring and the mounting boss, two end faces of the metal seal ring are in sliding seal fit with a butterfly plate and a limiting part, and multiple through holes are formed in the limiting part, and communicate with the floating space. The butterfly valve has the advantages that due to the floating space, the metal seal ring can slightly move and elastically deform in the radial direction, the floating space can better adapt to a valve base seal face, when the floating space is in seal fit with the valve base seal face, the better seal effect isachieved, meanwhile, a medium can pass through a through hole to enter the floating space, medium pressure is provided for the metal seal ring, the self seal effect is achieved, the seal effect of thespace and the valve base seal face can be further ensured, dual-way seal is achieved, and no leakage exists.

The invention discloses a self-sealing spiral energy gathering joint cutting device. By means of the self-sealing spiral energy gathering joint cutting device, a traditional shaped charge form is changed, and spiral jet flow sprayed to the periphery can be formed. The self-sealing spiral energy gathering joint cutting device comprises a spiral tubular shaped charge cover, an explosive and an igniter. The spiral tubular shaped charge cover is formed in a manner that a tubular product is tightly and spirally wound. The explosive is an ordinary explosive, and the explosive is loaded into a cavitydefined by the tube to form charge. The igniter is a universal priming material such as a detonator and a detonating cord. By means of the self-sealing spiral energy gathering joint cutting device, the problems of overexcavation and under-excavation of the foundation of medium-length hole blasting and the underholing problem are mainly solved, and following construction is facilitated. In a borehole-blasting method, the borehole extra-deep situations can be reduced, the hole drilling cost is reduced, and the utilization rate of boreholes is increased. The explosive energy is reasonably utilized, the cost is saved, a new thought is initiated, the spiral shaped charge cover convenient and rapid to use is introduced, the form is simple, machining is easy, the production efficiency is improved, and the use cost is reduced.

The invention discloses a pressure self-sealing stop valve. The pressure self-sealing stop valve comprises a stop valve body, wherein a valve seat is arranged in the stop valve body; a valve cover isin threaded connection with the top of the stop valve body; a valve rod is in threaded connection with inside of the valve cover; a connecting seat is movably mounted at the bottom of the valve rod; apressure compensation mechanism is arranged in the connecting seat. Distance for vertical movement of a valve plate is provided by the pressure compensation mechanism, so that water flow or air flowenters a self-pressure inlet circular groove through a water inlet and then flows into a self-pressure storage tank, force moving downwards is formed by the valve plate through the water flow or the air flow and drives a first inclined sealing ring and a second inclined sealing ring to tightly contact for sealing, the problems that an existing stop valve is poorer in self-sealing effect and is likely to produce gaps at the sealing joints are solved, the pressure self-sealing stop valve has the advantage of a good self-sealing effect, sealing performance of the stop valve is improved, and use safety of a user is guaranteed.

The invention relates to an inert gas internal-relaxation self-repair tyre. A relaxation layer is arranged on a relaxation inner tube, a self-repair liquid is put into the relaxation inner tube and the relaxation inner tube is filled with inert gas. The relaxation layer is arranged on the relaxation inner tube, gas is applied to the relaxation layer so that standards are satisfied, the relaxation layer does not stretch and has good elasticity, the relaxation layer of the relaxation inner tube at a touchdown angle position does not stretch, after puncture, the hole can be self-shrunk to form a gap, the self-repair liquid can seal the gas leakage gap, and the inert gas is fed into the relaxation inner tube and is used for preventing deterioration of the self-repair liquid in the relaxation inner tube. The self-repair liquid can be selected from multiple glue solutions in the market and inert gas does not react with the glue solution so that the self-repair liquid undergoes a reaction only at puncture overflow edges so that the self-repair liquid is effective for a long time and does not go bad.

The present invention provides sintered porous plastic plugs for use in filtered serological pipettes which facilitate manufacture or assembly of the filtered serological pipettes. In one embodiment, a sintered porous plastic plug of the present invention comprises plastic and a cylindrical body, a first end and a second end, the first end having a cross-sectional area less than the cross-sectional area of the cylindrical body, and the second end having a cross-sectional area less than the cross-sectional area of the cylindrical body.

The invention provides a waterproof sealing structure for a duct pipe connecting joint of a shield tunnel. The waterproof sealing structure comprises a waterproof sealing gasket body, wherein one side face of the waterproof sealing gasket body is inserted in a corresponding waterproof sealing gasket groove in a duct pipe, and the other side face of the waterproof sealing gasket body is in butt joint with a waterproof sealing gasket body of an adjacent duct pipe adjacent to the duct pipe. The waterproof sealing structure further comprises a first self-sealing body used for strengthening the waterproof capacity between the duct pipe and the waterproof sealing gasket body and a second self-sealing body used for strengthening the waterproof capacity between the waterproof sealing gasket body and the waterproof sealing gasket body of the adjacent duct pipe. One end of the first self-sealing body is connected with the waterproof sealing gasket body, so that the first self-sealing body is tightly attached to the duct pipe when being pressed. One end of the second self-sealing body is connected with the waterproof sealing gasket body, and the connecting position of the end of the second self-sealing body and the waterproof sealing gasket body is located at the end, close to the adjacent duct pipe, of the waterproof sealing gasket body. The waterproof sealing structure is easy to process, good in self-sealing effect and low in cost. Meanwhile, when the opening amount of the duct piece joint is large, waterproof failure cannot be caused.

The invention discloses a piston for a disposable sterile syringe. The piston is prepared from the following raw materials in parts by weight: 1.0-2.5 parts of activated zinc oxide, 0.5-1.5 parts of stearic acid, 1.0-2.0 parts of environment-friendly anti-aging agent 1010, 10-15 parts of carbon black N330, 50-60 parts of calcined clay, 1.5-3.0 parts of petroleum jelly for medical purposes, 0.2-0.6 part of accelerant TMTM, 0.2-0.5 part of accelerant TRA, 1.0-2.0 parts of sulfur and 100 parts of isoprene synthetic rubber. The manufacturing method comprises the following steps: taking the raw materials as ingredients, mixing with the isoprene synthetic rubber, respectively manufacturing rubber sheets, manufacturing a semi-finished product, removing flashes, cleaning, drying and checking. The piston for the disposable sterile syringe, which is made of the isoprene synthetic rubber, is excellent in biological performance index, good in ageing resistance, high in resilience force and excellent in self-sealing performance, a pyrogen reaction is avoided, lots of energy is saved, and the environmental pollution is reduced.

The invention relates to a marine rudderstock double-sided lip seal ring which comprises a seal ring body. An upper inner side lip and an upper outer side lip as well as a lower inner side lip and a lower outer side lip are integrally arranged at the upper end and the lower end of the seal ring body in a coaxial opposite-symmetrical outwards-inclined extending way; a sealing surface on which the lip sealing end between the upper inner side lip and the upper outer side lip is located is perpendicular to a seal ring inner hole, and a sealing surface on which the lip sealing end between the lowerinner side lip and the lower outer side lip is located is perpendicular to the seal ring inner hole, so that a double-sided end surface sealing structure is formed; sloping bench ring surfaces are integrally arranged on one sides, close to the seal ring inner hole, of the top parts and the bottom parts of the upper and lower inner side lips; a stainless steel strengthened ring is arranged in themiddle of the peripheral rubber of the seal ring body; and polytetrafluoroethylene seal rings are arranged in the sloping bench ring surfaces. The marine rudderstock double-sided lip seal ring provided by the invention adopts a double-sided lip sealing structure so as to be good in rudderstock sealing effect, less in vibration sensitivity, and less in rudderstock surface wear.

The invention relates to a self-sealing instrument pipe fitting. The self-sealing instrument pipe fitting comprises an outer cylinder, the two ends of the outer cylinder are connected with a pipelinerespectively, the pipeline is inserted into the outer cylinder, a circle of abutting plate is arranged in the middle of the interior of the outer cylinder, and a sealing device is arranged on the inner wall, making contact with the pipeline, of the outer cylinder. The sealing device comprises a plurality of air bag films, a pressurizing device and a rubber sealing belt, the pressurizing device isused for inflating and deflating the air bag films, the air bag films are fixed to the inner wall of the outer cylinder, the rubber sealing belt is connected with the outer side faces of the air bag films, and every two adjacent air bag films are separated through a partition plate. The two ends of the outer cylinder are provided with non-closed sealing anti-disengaging rings, the two ends of thesealing anti-disengaging rings are connected through protruding connecting tables, and screw holes and tightening nuts are arranged on the connecting tables. Double sealing is conducted through the sealing device and the sealing anti-disengaging rings, operation is easy, and the sealing effect is good.

The invention provides a film coating liquid for a halogenated butyl rubber plug, a film coated rubber plug, and preparation methods and applications of the film coating liquid and the film coated rubber plug, and relates to the technical field of medical rubber accessories, and the film coating liquid for the halogenated butyl rubber plug provided by the invention is simple in formula, and only comprises aryl siloxane, polytetrafluoroethylene and corresponding solvents. After polytetrafluoroethylene is formed into a film, a vulcanizing agent and various other additives in the halogenated butyl rubber plug can be effectively prevented from being separated out, and pollution to stored products is avoided. Meanwhile, aryl siloxane is matched, so that the elasticity of the halogenated butyl rubber plug can be greatly improved, the halogenated butyl rubber plug has better self-sealing performance, the quality of a preserved product is guaranteed, and the valid period is prolonged.

The invention provides a rapid connection device used for a deepwater hydraulic pipeline and an oil outlet connector. The rapid connection device used for the deepwater hydraulic pipeline is mainly composed of two parts including an oil inlet connector and the oil outlet connector and is suitable for a hydraulic control system of a deepwater operation device. When the rapid connection device used for the deepwater hydraulic pipeline and the oil outlet connector are used, the flowing direction of oil is ascertained onshore or on a working mother boat, the oil inlet connector is installed on an oil supply pipeline of a deepwater oil source and the oil outlet connector is installed on an oil inlet pipeline of a hydraulic control valve housing, when the deepwater operation device and the deepwater oil source respectively reach the specified operation location and are in positions under the carrying of a remote operated vehicle (ROV), two mechanical arms of the ROV coordinate the operation and connect the oil inlet connector and the oil outlet connector, so that the rapid butt connection of the hydraulic oil line is achieved. After being connected by the rapid connection device used for the deepwater hydraulic pipeline, the hydraulic oil line can be connected and disconnected directly by only adjusting the oil pressure of the oil inlet connector.

The invention discloses a resistive board chamber detector which comprises a first circuit board, a second circuit board, a first glass piece, a second glass piece, a first graphitic layer, a second graphitic layer, a third glass piece and an annular sealing strip. The first circuit board and the first circuit board are arranged in a spaced mode, the sealing strip is connected between the first circuit board and the second circuit board, a sealing cavity is defined by the sealing strip, the first circuit board and the second circuit board together, an air inlet and an air outlet are formed in the sealing strip in a spaced mode, and both communicated with the sealing cavity, and the first glass piece, the second glass piece and the third glass piece are all located in the sealing cavity. The resistive board chamber detector is a self-sealed multi-air-gap resistive board chamber detector, has the self-sealing performance, does not need to be placed in a flow air box and can independently work, therefore, the cost for manufacturing the flow air box is omitted, and ventilation time and air exchange time spent in preparation before an experiment are shortened.

The invention discloses an all-season long-acting self-sealing composite solid lubricant for a gear box. The composite solid lubricant is prepared from base oil, a thickening agent, an antioxidant, atackifier and a composite solid lubricating material, the composite solid lubricating material is composed of flaky graphite, colloidal molybdenum disulfide, polytetrafluoroethylene and yellow lead oxide. The composite solid lubricant comprises the following components in percentage by weight: 10-40% of the thickening agent, 0.2-1.6% of the antioxidant, 4-12% of the tackifier, 8-25% of the flaky graphite, 0.5-5% of the colloidal molybdenum disulfide, 0.5-2% of the polytetrafluoroethylene, 0.5-2% of the yellow lead oxide and the balance of the base oil.

The invention discloses a lip-shaped mechanical seal device. The lip-shaped mechanical seal device comprises a mounting base, a compensation element and two cup bodies. The two cup bodies comprise thefixed cup body and the moveable cup body. Flat end face seal is formed between the two contact end faces of the fixed cup body and the movable cup body. At least one of lip-shaped end face seal and lip-shaped outer circumferential face seal is further formed between the two cup bodies. An end face sealing lip abuts against the end faces of the cup bodies to form lip-shaped end face seal. An outercircumferential face sealing lip abuts against the outer circumferential faces of the cup bodies to form lip-shaped outer circumferential face seal. The lip-shaped seal structure mode is adopted, inaddition, a pumping groove is formed in a lip, leaking media are pumped back reversely, and the sealing effect is enhanced; and in addition, friction heat between sealing end faces is realty reduced by adopting a PTFE material, abrasion of the sealing end faces is reduced, and the situation that the end faces are opened and leakage and collision damage occur due to temperature rising and medium gasifying is prevented.

The invention provides a disposable needle tip sheath for sampling blood and a preparation method thereof. The method comprises the following steps: mixing zinc oxide, a stearic acid, an anti-aging agent 2246, white carbon black 955-1, glycerol, polyisobutene BH-100, calcined clay, titanium dioxide GA-100, an accelerant DM, an accelerant PZ, an accelerant CZ, DTDM, sulphur, a grafting agent JT-510A and carbon black N330 serving as auxiliary materials with natural rubber (or synthetic rubber); respectively preparing a film and a semi-finished product; and deflashing, cleaning, drying and checking the film and the semi-finished product, so as to obtain the needle tip sheath. The disposable needle tip sheath for sampling blood provided by the invention is good in ageing resistance, large in resilience force, excellent in self-sealing performance, and free of pyrogen reaction, and can well meet with the relevant standards of medical equipment.

The invention discloses a detachable anti-drop self-sealing connection method and structure for a corrugated pipeline, and is characterized in that two self-sealing rings (4) are respectively mounted from two ends of a bidirectional socket and spigot joint shell (6), and then two anti-drop pressing rings (3) are respectively mounted on two end surfaces of the bidirectional socket and spigot joint shell (6), so that gaps are reserved between the anti-drop pressing rings (3) and the joint shell (6); the two-way socket and spigot joint is formed; two corrugated pipelines (1) are inserted in place through the two ends of the two-way socket-and-spigot joint respectively, the screws (2) on the two-way socket-and-spigot joint are locked, the anti-disengaging pressing ring (3) is made to be tightly attached to the end face of a shell (6) of the two-way socket-and-spigot joint, the self-sealing ring (4) is pressed, and socket-and-spigot connection and sealing of the corrugated pipelines are completed. Through the realization of the self-sealing structure, the self-sealing of the pipeline joint is realized by utilizing the accumulation of flowing silt in the pipe network, and the damage of the accumulation of the flowing silt in the pipe network to the sealing connection of the pipeline is avoided.

The invention discloses a reciprocating sealing device which comprises a cylinder and a piston and is characterized in that a seal trough is arranged on the piston, and a sealing inner ring is arranged in the seal trough. A supporting ring and a guide ring are respectively arranged at two ends of the sealing inner ring in mirroring mode, the supporting ring is arranged between the guide ring and the sealing inner ring, a sealing body with a groove is arranged on the supporting ring, a small hole is arranged on the guide ring, and the supporting ring is made of Buna-N rubber. The reciprocating sealing device is good in self sealing performance and long in service life, can greatly reduce loss caused by shutdown and production halts due to hydraulic cylinder replacement or sealing easily-damaged part replacement, and is especially suitable for working for a long time in working conditions of high pressure overloading or unbalance loading in metallurgy and other industries.