42results about How to "The sealing performance is safe and reliable" patented technology

The invention discloses an automatic control device of drop transfusion system, which consists of lye storage and float in the lye storage, wherein the liquid-in needle (1) with liquid-in opening (2) and vertical convex area (3) toward intracavity with liquid-out opening (4); the float contains cylindrical floater (5) and soft elastomer sealer (8). There is longitudinal gap between sealer (8) and vertical convex area (3) that matches each other. The invention provides a precise and reliable sealed transfusion system with automatic closing system effectively, which can be applied in the medical treatment domain widely.

The invention discloses a detachable floater type water valve device. The floater type water valve device comprises a valve part and a floater part, and the valve part is separated from the floater part; the valve part is a check valve, and comprises a valve seat and a spool structure running through the center of the valve seat, and the lower end of the spool structure is provided with a cambered surface; the floater part comprises a pivotally arranged lever type floater structure, which comprises a floater at one side of a pivot and an abutting part at the other side of the pivot, and the end part of the abutting part is provided with a cambered surface, which correspondingly abuts against the cambered surface of the spool structure; and the floater can be rotated with the pivot as the axis according to the change of water level to drive the abutting part to slide to push the cambered surface of the spool structure, so that the valve part can be opened and closed. The detachable floater type water valve device utilizes the floater and the leverage to open and close the valve.

The invention relates to a clamping sleeve type metal sealing pipe joint and a using method thereof. The clamping sleeve type metal sealing pipe joint comprises a joint body, a clamping sleeve and a nut, wherein the joint body and the nut are in threaded connection, the clamping sleeve is arranged between the joint body and the nut, the clamping sleeve is a metal piece, the clamping sleeve is provided with a front cutting edge and a rear cutting edge, the front end of the clamping sleeve is matched with a conical surface of the joint body, the rear end of the clamping sleeve is matched with a conical surface of the inner surface of the nut, and sealing is realized by enabling the front cutting edge and the rear cutting edge to be cut in the outer wall of a pipe. According to the clamping sleeve type metal sealing pipe joint disclosed by the invention, the structure of two cutting edges is adopted, the sealing performance is more reliable, the anti-shock performance and the anti-vibration performance are more excellent, and the service life is long.

The invention discloses a large-diameter single-double quick-change rotary blowout preventer assembly. The assembly comprises a driving assembly, an upper rubber core rotating assembly and a lower rubber core rotating assembly detachably connected with the bottom of the upper rubber core rotating assembly, wherein the upper rubber core rotating assembly comprises an upper central shaft protectivesleeve, an upper rubber core outer shell, an upper rubber core, an upper rubber core framework, an upper rubber core driving hanger and an upper rubber core sealing gland. The large-diameter single-double quick-change rotary blowout preventer assembly gives consideration to the large-diameter central shaft size and the high-dynamic sealing pressure, on the premise of ensuring that a central shaftdiameter is unchanged, quick change of a high-pressure double-rubber-core assembly and a low-pressure single-rubber-core assembly can be realized, meanwhile, a connection mode of the rubber core hanger and a sealing rubber core, a connection mode of the upper rubber core sealing gland and the upper rubber core outer shell as well as a fixing mode of a rotary sealing bushing are improved, the situation that equipment sealing failure caused by screw thread loosening and sealing bushing abrasion due to vibration can be effectively prevented, and the assembly is compact and simple in structure, convenient in on-site disassembly and assembly, and high in practicability.

The invention provides cell-grade lithium metal casting device and method, relates to lithium metal casting device and method, and in particular relates to a cell-grade lithium metal casting device of a full-closed type metal structure and a cell-grade lithium metal casting method. The device comprises a pure lithium cylinder, a disc casting machine, an argon circulating device, an argon device, a vacuum pump, a refrigerator unit and a control cabinet; the disk casting machine comprises a casting machine cylinder body, a bottom disk, a rotating disk, a die, a gearbox and a stepping motor; a casting machine vacuum pipe and a casting machine argon pipe are respectively connected with the outer vacuum pump and the argon device; a circulating argon inlet pipe is connected with the outer argon circulating device; a second liquid sealing valve is mounted between the pure lithium cylinder and the disk casting machine; a communication pipe is mounted between the pure lithium cylinder and the disk casting machine; the argon circulating device comprises a heat exchanger and a circulating fan which are connected in a sequence. The cell-grade lithium metal casting device is simple and compact in structure, simple and convenient to operate, safe and reliable to produce and run, and achieves whole-process automatic controlled production.

The invention discloses a non-penetrating type hydraulic valve piston device. The non-penetrating type hydraulic valve piston device comprises a flat valve, a piston unit driving the flat valve to open or close and arranged at the upper end of the flat valve, and a valve covering unit used for sealing the flat valve and arranged at two ends of the flat valve. The piston unit further comprises a cavity body with a sliding space, a piston body and a valve rod. The piston body is arranged in the cavity body, and is of an integral solid structure. The upper end of the valve body is connected withthe piston body. The lower end of the valve body is connected with a valve plate arranged in the flat valve. The non-penetrating type hydraulic valve piston device has the beneficial effects that thepiston is arranged to be solid, and therefore a leakage point is avoided, and the sealing performance is safe and reliable; and a sealing groove is not required for the valve rod, the diameter of thevalve rod can be increased correspondingly, and intensity of the valve rod is improved.

The invention relates to a metal-plastic composite tube provided with enhanced sealing mechanisms on end parts and a manufacturing method thereof. The metal-plastic composite tube comprises a metal-plastic composite tube body. The enhanced sealing mechanisms are arranged at two ends of the metal-plastic composite tube body. The invention also provides a manufacturing method of the metal-plastic composite tube. The end surfaces of the metal-plastic composite tube are prevented from being in contact with water, so that the metal-plastic composite tube where water passes for a long time is not layered and cracked.

The invention discloses a pipe joint of a corrugated hose. The corrugated hose comprises a plurality of wave nodes at the middle part and a light tube at an end part; the pipe joint comprises a tubular joint body and a tubular clamping sleeve, wherein the joint body comprises an inserting end used for connecting the corrugated hose, and a connection end used for connecting external devices; a plurality of elastic clamping jaws which can be clamped and fixed on the wave nodes are arranged on the outer circumferential side of the joint body and in a position close to the inserting end; the outer circumferential side of the clamping sleeve is sleeved with a first sealing ring in a positioning manner; one end of the clamping sleeve, which is close to the connection end, is arranged inside the joint body in the positioning manner; a second sealing ring is fixed on the end surface of the one end of the clamping sleeve in the positioning manner; the other end and the middle part of the clamping sleeve can be penetrate into the light tube, so as to enable the first sealing ring to be sealed between the light tube and the clamping sleeve. The pipe joint of the corrugated hose has the advantages that the structure is simple and skillful, the butt joint process is convenient and efficient, the sealing performance is safe and reliable, and the manufacturing cost is low.

A pneumatic valve control mechanism is disclosed, a pneumatic valve comprises a valve body and an upper valve cover, a valve spool, and a valve shaft. The valve spool is provided with a passage. The pneumatic valve control mechanism comprises a rotating cylinder, a cylinder driving actuator, a sealing control mechanism, and a valve spool action position detecting mechanism. The outer walls of thetwo ports of the valve spool are provided with sealing grooves along the circumferential direction, and an inflatable sealing ring is arranged in the sealing groove. A spool intake passage communicating with the sealing groove is arranged in the valve spool along the radial direction. A valve shaft intake passage communicating with the spool intake passage is axially arranged in the valve shaft. The spool intake passage communicates with the inflatable sealing ring. The valve spool is actuated through the cylinder, after the valve spool reaches the set position and the air pressure is controlled to inflate and pressurize the sealing ring, so that the valve meets the requirement for complete sealing. According to the requirements for use, the pressure of the gas entering the sealing ring can be adjusted by a filter pressure reducing valve. The control mechanism of the invention can be used under the working conditions of high sealing performance requirement and abrasion on the sealing surface, thereby achieving the function of safe, reliable and stable operation of the equipment and reducing the maintenance frequency of the equipment.

The invention discloses a self-sealing square hose and circular hose conversion joint resistant to the medium-high pressure and sealing and connecting methods for hoses, and relates to the technical filed of sealing and connection of hoses. The conversion joint comprises a body, a sleeve provided with a conical table at one end, a pressing sleeve provided with a conical hole in one end, and a pressing block, wherein a rectangular hole is formed in the pressing block; and a connecting block is fixedly arranged at one end of the joint body, a mounting blind hole is formed in the joint body, thepressing block can be compressed towards the joint body, the sleeve and the pressing sleeve are arranged in the mounting blind hole, and the pressing sleeve can be compressed towards the sleeve. The sealing and connecting method for the circular hose refers to the sleeve and the pressing sleeve, the hose penetrates through the pressing sleeve and is inserted into the sleeve, the pressing sleeve ismoved to enable the conical table to extrude the hose, and thus sealing and connecting is completed; the sealing and connecting method for the square hose refers to the connecting block and the pressing block, the hose penetrates through the pressing block and is connected to the connecting block in a sleeving mode, the pressing block is moved to enable the hose to be connected and sealed under extruding of the connecting block and the pressing block. According to the sealing and connecting methods, connecting is reliable, a sealing piece does not need to be additionally arranged, and the cost is low; and the conversion joint is simple in structure and convenient and quick in operation, and can bear the medium-high pressure load.

The invention discloses a goods stack thin film curtain sealing oxygen-concentration reduction method. The goods stack thin film curtain sealing oxygen-concentration method comprises the following steps that step 1, thin films are cut according to the size of goods stacks, and the thin films are made into an upper curtain with a lower opening and a lower curtain with an upper opening through sealants; step 2, the lower curtain is placed on the ground, and then trays and the goods stacks on the trays are placed in the lower curtain; step 3, the upper curtain covers the goods stacks, and deoxidizing agents are put according to the volume ratio of the goods stacks; and step four, an opening of the upper curtain and an opening of the lower curtain are in smooth butt joint and then sealed through the sealants, and operation is completed. The sealing effect is safer in the operation process of film curtain glue sealing, the risks of poor sealing such as film wrinkle coking, micropore scalding and leaking and repeated heat sealing caused by other factors are reduced, and the oxygen-concentration reduction effect of the film curtain is guaranteed.

The invention discloses a bowl-shaped plug assembly tool. The bowl-shaped plug assembly tool is used for plugging an oblique oil channel of a cylinder body. Threaded holes are formed in the peripheryof the oblique oil channel of the cylinder body. The bowl-shaped plug assembly tool comprises a push rod assembly, a pressing plate and a locating seat. According to the structure of the push rod assembly, a rod tail is located at one end of the push rod assembly and is provided with a thread; a limiting ring is provided with an internal thread; a punch head is located at the other end of the pushrod assembly and used for pushing and sleeving a bowl-shaped plug. A big-end-up pressing plate oblique stepped hole is formed in the middle position of the pressing plate. The inner diameter of the small end of the pressing plate oblique stepped hole is less than the outer diameter of the limiting ring. A big-end-down locating seat oblique stepped hole is formed in the middle position of the locating seat. The push rod assembly with the rod tail upwards first penetrates through the locating seat oblique stepped hole, then penetrates through the pressing plate oblique stepped hole and finallylocks and fixes the limiting ring onto the rod tail. The inclination of the pressing plate oblique stepped hole and the locating seat oblique stepped hole is the same as the inclination of the obliqueoil channel. The bowl-shaped plug assembly tool is simple in structure, convenient to operate and capable of improving the installation efficiency and quality of the bowl-shaped plug.

The invention relates to a foldable rapid plugging device based on a trapezoidal roadway. The foldable rapid plugging device comprises a telescopic main body frame, foldable fireproof plates and a control center. The foldable fireproof plates are arranged on the two sides of the main body frame. After the main body frame extends and the foldable fireproof plates are unfolded, the device clings tothe side wall of the trapezoidal roadway, so that the trapezoidal roadway is plugged up. The main body frame comprises telescopic stand columns and pipe fittings hinged between the stand columns in acrossed mode. Each telescopic stand column is a stand column of a three-level telescopic structure so as to adapt to roadways of different heights. Moving wheels are arranged at the bottoms of the stand columns of the main body frame. A reel fire protection device is movably connected with the outer portion of each telescopic stand column. The foldable fireproof plates are symmetrically connectedto the two ends of the main body frame, and each foldable fireproof plate comprises a fixing block, a fireproof top plate, a fireproof bottom plate, fireproof side plates and a supporting device. Thefoldable rapid plugging device is light, resistant to high temperature, safe and reliable.

The invention relates to a rock shearing seepage coupling true triaxial test system, which comprises a loading assembly, a test box, a seepage assembly, a detection assembly and a control assembly. The whole system is high in rigid, safe and reliable in high-pressure water injection and sealability, good in sealing reliability, high in loading stability and protection strength and capable of effectively reducing the end-part friction effect and the corner effect and realizing the uniform triaxial stress state as far as possible; a loading test device and a mainshaft loading mechanism are designed in a split manner, and safe high-pressure water injection is achieved; a safety valve and a pressure-stabilizing control device are arranged on a water outlet; and the rock shearing seepage coupling true triaxial test system is stable to control.

The invention relates to a novel dual-drive fully-closed coal gas water seal gate valve. The novel dual-drive fully-closed coal gas water seal gate valve comprises a valve body, a valve deck and a valve plate; the valve plate is movably arranged in a body cavity formed by the valve body and the valve deck; the valve deck is provided with a valve plate opening and closing mechanism which comprisesa valve opening and closing driving device, an opening and closing rotating shaft and a rocking arm; the valve opening and closing driving device is in key connection with the opening and closing rotating shaft; the opening and closing rotating shaft is in key connection with the rocking arm; a slider I is arranged in an opening groove in the other end of the rocking arm in a sliding manner, and is in movable hinge connection with a connection plate pin column penetrating through the valve plate; the two ends of the connection plate pin column are hinged in through holes of two sliders II; andthe sliders II slide in grooves formed in the valve deck so that the connection plate pin column can drive the valve plate to do linear movement in the body cavity. The novel dual-drive fully-closedcoal gas water seal gate valve has a series of advantages of being small in volume, small in weight, flexible in installing manner, high in opening and closing speed, safer and more reliable in sealing, novel in outline structure and the like.

The invention relates to lithium metal glove box equipment, in particular to battery grade lithium metal glove box equipment with a fully enclosed metal structure. The battery grade lithium metal glove box equipment includes a demoulding box and an encapsulation box. A vacuum gate valve is arranged between the demoulding box and the encapsulation box, the demoulding box and the encapsulation box are connected with the vacuum gate valve through a flange sealing, so that a demoulding, a cooling and an encapsulation are guaranteed to be conducted in different equipment spaces, and operation is respectively conducted independently. The battery grade lithium metal glove box equipment adopts a fully enclosed metal structure design that the demoulding and the encapsulation are separated, and the system sealing property is safe and reliable.

The invention provides cell-grade lithium metal casting device and method, relates to lithium metal casting device and method, and in particular relates to a cell-grade lithium metal casting device of a full-closed type metal structure and a cell-grade lithium metal casting method. The device comprises a pure lithium cylinder, a disc casting machine, an argon circulating device, an argon device, a vacuum pump, a refrigerator unit and a control cabinet; the disk casting machine comprises a casting machine cylinder body, a bottom disk, a rotating disk, a die, a gearbox and a stepping motor; a casting machine vacuum pipe and a casting machine argon pipe are respectively connected with the outer vacuum pump and the argon device; a circulating argon inlet pipe is connected with the outer argon circulating device; a second liquid sealing valve is mounted between the pure lithium cylinder and the disk casting machine; a communication pipe is mounted between the pure lithium cylinder and the disk casting machine; the argon circulating device comprises a heat exchanger and a circulating fan which are connected in a sequence. The cell-grade lithium metal casting device is simple and compact in structure, simple and convenient to operate, safe and reliable to produce and run, and achieves whole-process automatic controlled production.

A single-hoop and dual-hoop shared tube jointer with squeeze sealing join is composed of a joint body, single or dual squeeze hoops with head wedge, sealing cantilevers, internal squeeze edge, etc, and a drive nut. Its advantages are obvious 'stop sensing', and high resistance to over-drive and vibration.

The invention relates to a glue injection method of valve covers, which comprises the steps as follows: each upward valve cover arranged on a groove is placed on a disc face with a diameter of 32mm to 33mm, and the disc face with strong magnetism can automatically adsorb the valve covers. A glue spraying device with a downward opening is arranged at the position 3mm to 5mm above a groove of the valve covers, a disc drives the valve covers to rotate one circle, and the glue spraying device sprays out thick glue with the total amount of about 0.5ml. The valve covers with the glue injected are conveyed and placed in a drying machine to be dried at a temperature of 200 DEG C to 230DEG C, and after 2 minutes to 3 minutes, the whole glue injection process is finished. The glue injection method of valve covers has the advantages of adopting a high-temperature forming technology to enable an iron sealing cup to be adhered tightly with a sealing rubber cushion; being capable of achieving full-automatic glue injection and monitoring control and increasing output while ensuring product quality; and being safe and reliable in sealing effect.

The invention discloses an explosion-proof signal lamp and a sealing structure thereof. The explosion-proof signal lamp comprises a key cap (1), a battery box (2), a battery (3), an LED (light-emitting diode) flashlight plate assembly (4), an explosion-proof signal lamp circuit assembly (5) and the sealing structure. The sealing structure comprises a shell (6), a sealing ring and a locking screw (7). The shell (6) is inlaid on the battery box (2) and is sealed through the sealing ring. The locking screw (7) penetrates through the shell (6) and is tightly fixed with a screw hole in the battery box (2). The shell (6) and the battery box (2) jointly form a sealing space to seal the battery (3), the LED flashlight plate assembly (4) and the explosion-proof signal lamp circuit assembly (5). The explosion-proof signal lamp and the sealing structure thereof have the advantages that the full sealing of the signal lamp is better realized, and the defects of sealing failure for reasons that the sealing ring is collapsed under the effect of external force and the sealing ring is aged because the sealing ring is exposed in the air for a long time are eliminated.

The invention relates to a trapezoidal roadway-based foldable fast sealing device, which includes a retractable main frame, a foldable fireproof board and a control center. The foldable fireproof boards are arranged on both sides of the main frame, and the main frame is elongated, After unfolding, the foldable fireproof board is close to the side wall of the trapezoidal roadway to block the trapezoidal roadway. The main frame includes telescopic uprights and pipe fittings cross-hinged between the uprights; the telescopic uprights are three-stage telescopic structure uprights to adapt to roadways of different heights; the bottom of the uprights of the main frame is provided with moving wheels; the outside of the telescopic uprights is movably connected with reels Fire prevention device; foldable fireproof boards are symmetrically connected at both ends of the main frame, and foldable fireproof boards include fixed blocks, fireproof top boards, fireproof bottom boards, fireproof side boards and supporters. The invention is light, high temperature resistant and safe and reliable.

The invention discloses oil pipe and sucker rod coupling detection equipment and a detecting method. The oil pipe and sucker rod coupling detection equipment is mainly composed of four parts including an oil pipeline assembly, a detection head assembly, an oil pipeline centralizing and detecting unit and a signal measuring and transmitting unit, wherein the detection head assembly is composed of a detecting shaft, a detecting roller, a detecting shift fork and a self-lubricating copper bush; the oil pipeline centralizing and detecting unit is composed of a shell, a shell end cover, a detecting arm, a detecting arm end cover and a regulating and centralizing piston rod; and the signal measuring and transmitting unit is composed of an energy accumulator, an energy accumulator fixing frame and a pressure sensor. The oil pipe and sucker rod coupling detection equipment is compact in structure, high in automaton degree, capable of working in a high-pressure or no-pressure state, suitable for detecting oil pipe and sucker rod couplings with various sizes, also incapable of generating influences to construction operations of other operating tools with heavy calibers and capable of providing accurate information for detection and alarm of coupling detection devices, meeting the requirement of HSE and ensuring that a coupling successfully passes through a wellhead along the central axis of the wellhead.

The invention relates to a metal sealing valve seat and a wear-resisting ball valve. The metal sealing valve seat comprises a valve seat body which is provided with an axial channel. A valve seat sealing face is arranged at one end of the valve seat body, and at least one radial groove is formed in the end face of the other end of the valve seat body. At least one axial groove is formed in the outer circle face of the valve seat body and penetrates the two end faces of the valve seat body. One end of the radial groove communicates with the axial channel, and the other end of the radial groovecommunicates with one end of the axial groove. By means of the metal sealing valve seat and the wear-resisting ball valve, when the valve is partly opened, a middle cavity of the valve is automatically purged through medium gas in a pipeline or by leading high-pressure gas, the phenomenon that medium dust particles are gathered in the middle cavity and harden a sealing face embedded in a downstream valve seat and a ball body is prevented, the sealing reliability of the valve is improved, and the service life of the valve is prolonged; and in addition, a hole does not need to be formed in the outer portion of the valve for leading gas for purging, the effects of energy conservation and consumption reduction can be achieved, in addition, extra external leaking points are reduced, and the valve is better in sealing performance and safer.

The invention discloses an explosion-proof signal lamp and a sealing structure thereof. The explosion-proof signal lamp comprises a key cap (1), a battery box (2), a battery (3), an LED (light-emitting diode) flashlight plate assembly (4), an explosion-proof signal lamp circuit assembly (5) and the sealing structure. The sealing structure comprises a shell (6), a sealing ring and a locking screw (7). The shell (6) is inlaid on the battery box (2) and is sealed through the sealing ring. The locking screw (7) penetrates through the shell (6) and is tightly fixed with a screw hole in the battery box (2). The shell (6) and the battery box (2) jointly form a sealing space to seal the battery (3), the LED flashlight plate assembly (4) and the explosion-proof signal lamp circuit assembly (5). The explosion-proof signal lamp and the sealing structure thereof have the advantages that the full sealing of the signal lamp is better realized, and the defects of sealing failure for reasons that the sealing ring is collapsed under the effect of external force and the sealing ring is aged because the sealing ring is exposed in the air for a long time are eliminated.

The invention relates to a self-checking and sealing slip packer, which belongs to the field of downhole tools for oil and gas well operations. The packer is composed of an inner center pipe, an outer center pipe, slips and a slip sheath; one end of the inner center pipe is threaded with an upper joint, and the other end of the inner center pipe is threaded with a lower joint; the upper joint and the lower joint An inner piston sleeve, a release claw and an outer central tube are sequentially installed on the inner central tube between them; one end of the inner piston sleeve is threaded with a balance joint, and the inner piston sleeve at the other end of the balance joint is sequentially installed with an upper bushing and a lower bushing There is a bypass joint between the upper bushing and the lower bushing; the upper bushing on the side of the bypass joint is equipped with an upper guide ring, and the spacer is sealed with two sets of rubber tubes when setting to ensure that The sealing performance is safer and more reliable during setting, and has the characteristics of simple and fast operation; it meets the needs of sealing and separating oil layer casings in oilfield production.

The invention belongs to the technical field of mechanical design, in particular to a labyrinth sealing structure. The present invention adopts a right-angled trapezoidal tooth-shaped labyrinth seal structure, which is generally set as a left and right two-part labyrinth seal structure, and 15 comb teeth are arranged on the seal body, which are divided into 2 groups, and an annular space (1) is left between the 2 groups. A number of radial through holes are evenly distributed along the circumferential direction, and the sealing gas flows from here to the left and right parts of the labyrinth sealing structure; the sealing structure has the advantages of simple structure, easy processing, simple and easy assembly, and safe and reliable sealing effect. Advantages, and compared with the traditional sealing method, the allowable size space range is larger, so compared with the traditional sealing structure, it is not limited by the size of the maximum diameter of the rotor assembly, and there is no need to disassemble the dynamically balanced rotor, which can meet the sealing structure in special occasions Assembly and sealing requirements.

The invention discloses a pipe joint of a corrugated hose. The corrugated hose includes several corrugated nodes in the middle and a light pipe at the end. The pipe joint includes a tubular joint body and a tubular ferrule. The joint body includes The insertion end used to connect the corrugated hose and the connection end used to connect external devices, near the insertion end, there are several elastic claws that can be fastened on the joint at intervals on the outer periphery of the joint body The positioning sleeve on the outer peripheral side of the middle part of the ferrule is provided with a first sealing ring, one end of the ferrule is positioned and sleeved in the joint body close to the coupling end, and a second sealing ring is positioned on the end surface, The other end and the middle part of the ferrule can penetrate into the light pipe, so that the first sealing ring is sealed between the light pipe and the ferrule. The invention has the advantages of simple and ingenious structure, convenient and fast docking process, safe and reliable sealing performance, low manufacturing cost and the like.

The invention discloses an automatic control device of drop transfusion system, which consists of lye storage and float in the lye storage, wherein the liquid-in needle (1) with liquid-in opening (2) and vertical convex area (3) toward intracavity with liquid-out opening (4); the float contains cylindrical floater (5) and soft elastomer sealer (8). There is longitudinal gap between sealer (8) and vertical convex area (3) that matches each other. The invention provides a precise and reliable sealed transfusion system with automatic closing system effectively, which can be applied in the medical treatment domain widely.

The invention discloses a medium and high pressure resistant self-sealing square-circle conversion joint and a sealing connection method for hoses, and relates to the technical field of sealing and connection of hoses. The sleeve and the pressing block with a rectangular hole are processed. One end of the joint body is fixed with a connecting block, and a blind hole is installed inside. The pressing block can be pressed against the joint body. The sleeve and the pressing sleeve are arranged in the blind installation hole. Compress to the sleeve; the sealing connection method of the circular hose involves the sleeve and the pressure sleeve, the hose passes through the pressure sleeve and is inserted into the sleeve, and the pressure sleeve is moved to make the cone squeeze the hose to complete the sealed connection; square The hose sealing connection method involves a connection block and a pressure block, the hose passes through the pressure block and is sleeved on the connection block, and the pressure block is moved to complete the connection and sealing of the hose under the extrusion of the connection block and the pressure block. The method is reliable in connection, does not need additional seals, and has low cost; the conversion joint has a simple structure, convenient and quick operation, and can withstand medium and high pressure loads.

The invention discloses a round tube water heating device, which belongs to the technical field of heating and comprises a water inlet, an electrode sheet, a cover, a thick film heating round tube, a water sealing sheet, a sealing ring, a water channel core and a water outlet. The core is inserted into the thick-film heating round tube, the water-passing sealing sheet is arranged at both ends of the thick-film heating round tube, the sealing ring is arranged on the water-passing sealing sheet, and the cover is closed on the sealing ring and sealed. , the water inlet and the water outlet are respectively arranged on the covers at both ends, and the electrode sheet is electrically connected to the electrode of the thick film heating circular tube. By setting the water seal, the sealing ring and the cover, and fixing the connection on the cover with bolts, the sealing effect of the end is better, and the inner core of the stainless steel channel can be used, and the service life is longer, and the occurrence of When dry burning, no harmful substances will be produced, and water quality will not be polluted. Therefore, it has a long service life and is safer, and the sealing effect is better.