386 results about "Pressure - action" patented technology

The invention provides an air tightness detection device of a pressure balance type plug valve, and relates to the technical field of valve air tightness detection. An air tightness detection device of a pressure balance type plug valve comprises a water pool, an adjusting mechanism, two clamping mechanisms and an end sealing mechanism, the end sealing mechanism comprises two groups of positioning assemblies and two groups of sealing assemblies, and the positioning assemblies and the sealing assemblies are communicated and used for enabling the sealing assemblies to generate axial displacement. The sealing assembly is coaxially arranged in multiple layers, the structures of all the layers of the sealing assembly are the same, the sealing assembly is used for being inserted into an inlet and an outlet of a plug valve to be detected, and by means of the multi-layer design of the sealing assembly and the design that the positioning assembly enables each layer of the sealing assembly to generate independent axial displacement, the plug valve to be detected can be detected. The sealing assembly is adapted to plug valves to be detected with different calibers; the sealing assembly has the action of expansion under the action of air source pressure, so that the part inserted into the plug valve to be detected is in sealed connection with the plug valve, and the sealing performance is ensured.

The utility model relates to the technical field of fire fighting equipment, and discloses a fire hose quick connecting and sealing device which comprises a connecting male head, the outer side of the connecting male head is sleeved with a connecting female head, the outer side of the connecting female head is fixedly sleeved with a fixing seat, a cavity is formed in the fixing seat, and a piston mechanism is arranged in the cavity; a sealing seat is arranged on the inner wall of the female connector, a mounting groove is formed in the inner wall of the sealing seat, a sealing mechanism is arranged in the mounting groove, a groove is formed in the outer side of the male connector, and a limiting mechanism is arranged between the groove and the female connector. Compared with the prior art, the fire hose has the following advantages and effects that by arranging the sealing mechanism, a tiny gap between the connecting male head and the connecting female head can be effectively filled through the expanded sealing air bag, the purpose of preventing fire fighting water from leaking from the connecting part under the pressure effect is achieved, and therefore the sealing performance and reliability of the fire hose during water passing are guaranteed, and the service life of the fire hose is prolonged. And a powerful guarantee is provided for smooth fire-fighting operation.

The utility model discloses a reverse osmosis membrane shell sealing structure. The reverse osmosis membrane shell sealing structure comprises a membrane shell and an end cover assembly arranged in the inner space of the membrane shell, the end cover assembly comprises an end cover bearing plate, an end cover sealing plate and a U-shaped end cover sealing ring; the end cover bearing plate is connected with the membrane shell, the end cover sealing plate is arranged on one side of the end cover bearing plate and connected with the membrane shell, and the middle of the end cover sealing plate penetrates through the end cover bearing plate; one end of the U-shaped end cover sealing ring is connected with one end of the end cover sealing plate and located on the inner wall of the membrane shell, and a U-shaped opening faces the interior of the membrane shell; the U-shaped end cover sealing ring is tightly attached to the inner wall of the membrane shell and the end cover sealing plate under the action of pressure to form self-pressure sealing. According to the device, the self-pressure sealing function of the U-shaped end cover sealing ring is utilized, so that the sealing effect of the reverse osmosis membrane shell during high-pressure operation is improved; and when the equipment is stopped, the pressure of the internal medium is zero, and the pressure between the U-shaped sealing ring and the end cover sealing plate only comes from the natural tension of the U-shaped sealing ring, so that the U-shaped sealing ring is very easy to disassemble.

The invention discloses an evaporator and power conversion equipment, and belongs to the technical field of radiators. The multiple supporting structures are connected between the first inner wall face and the second inner wall face, part of the supporting structures define a pressure relief area, the pressure relief area communicates with the evaporation cavity, and the strength of the pressure relief area is smaller than that of the area where the other supporting structures are located; the pressure relief part is arranged in the pressure relief area and is arranged close to one supporting structure which forms the pressure relief area in a surrounding mode. The geometric shape of the pressure relief area is suddenly changed at the pressure relief part through the pressure relief part, so that the edge of the part, located in the pressure relief area, of the pressure relief part generates stress concentration under the action of pressure, the yield limit or the breaking strength of a material is easily reached firstly, breakage occurs, and directional pressure relief is achieved. Due to the fact that the wall thicknesses of the shell in the corresponding pressure relief area and the non-pressure relief area are the same, the overall corrosion resistance and strength of the evaporator are improved, and the reliability of equipment is improved.

This utility model discloses an embedded sealing structure for a rivet nut, comprising a body, an annular groove recessed at the end of the body, an abutting part between the annular groove and the edge of the body, a guide part coaxially located in the middle of the annular groove and connected to the body, and a plurality of ribs between the outer wall of the guide part and the annular groove, the tips of the ribs facing the same direction as the guide part. The design of the tips makes it easier for the ribs to penetrate into the metal plate and penetrate deeper, allowing the rivet nut to withstand greater torque. Due to the design of the annular groove, the contact area between the abutting part and the metal plate is much smaller than that of a traditional rivet nut, but the same fastening effect can be achieved. That is, the contact area is smaller under the premise of achieving the same fastening effect. When the product is under pressure, the bottom surface of the product and the surface of the component are more likely to fit together, achieving physical sealing and reaching IP67 protection level.

The invention relates to the technical field of aluminum profile hot extrusion cooling shaping, and particularly discloses an aluminum profile hot extrusion cooling shaping device which comprises a fixing table, a lifting table is arranged at the upper end of the fixing table in a lifting mode, a mounting groove is formed in the lower end of the lifting table, a graphite disc is arranged in the mounting groove in a lifting mode, and a graphite plate is arranged in the middle of the inner bottom wall of the graphite disc. A scraping assembly is arranged on the lifting table, and a switching assembly is arranged on the fixed table. The graphite plate is fixedly placed in the graphite plate, then the graphite plate is lifted into the installation groove, the height of the lifting table is adjusted at the same time, the cambered surface of the graphite plate abuts against the aluminum profile, the graphite plate can rapidly absorb and dissipate heat of the aluminum profile, and the aluminum profile is rapidly cooled, solidified and shaped under the pressure effect. And the scraping assembly is used for scraping the cambered surface of the graphite plate to repair or adjust the cambered surface shape, and the switching assembly is used for switching different graphite plates, so that the production efficiency is improved, and different cambered surface requirements are met.

The application discloses a kind of high-precision warping prevention clamping equipment of sheet part based on negative pressure adsorption, belong to the technical field of machine equipment.It includes adsorption platform, is provided with several adsorption holes on adsorption platform, and airflow chamber is arranged in adsorption platform;Plug is installed in adsorption hole, second filter screen is rotatably installed on plug, and torsional spring is installed in the rotary joint of second filter screen;Several adjusting frames are slidably installed on adsorption platform, several locating plates are installed on adjusting frame, threaded rod is rotatably installed on adjusting frame, and threaded rod is threadedly connected with adsorption platform.The plug is inserted into adsorption hole, and the inclined groove of guiding block can be inserted into the locating plate of adjusting frame, so that the plug is forced to drop to the limit position, the top of plug is slightly lower than the mouth part of adsorption hole, the plug is prevented from being damaged by knocking during workpiece clamping process, and the stability of plug after installation is improved when reverse pressure cleaning is prevented from being separated from adsorption hole by pressure.

The present invention relates to an air guide element (1) for movable attachment to an electrical component (2) in the region of an end face of an electric machine (4) comprising at least one stator (8), wherein the air guide element (1) comprises a rotating element (10) in the region of which a pivot point (16) of the air guide element (1) is located, as well as an impact area (12) and at least two pressure surfaces (14, 14'). The air guide element (1) guides and / or distributes a cooling airflow K over the at least two pressure surfaces (14, 14') such that the stator (8) is cooled, and when different pressures (p1, p2) act on the at least two pressure surfaces (14, 14'), the air guide element (1) rotates about the pivot point (16). The invention further relates to an air guide arrangement (100) comprising an electrical component (2) and an air guide element (1).The invention further relates to a method for cooling a stator (8) and to the use of the air guide element (1) and the air guide arrangement (100).

The invention discloses a control valve and a packer, and belongs to the technical field of oilfield development, the control valve comprises a pipeline assembly and a control assembly, a moving channel is formed in the pipeline assembly, and a closing position and an opening position are arranged in the axial direction of the moving channel; the control assembly comprises a sliding sleeve and an elastic piece, the sliding sleeve is in sliding connection with the moving channel, the elastic piece is arranged between the sliding sleeve and the opening position, and when external pressure is larger than internal pressure of the moving channel, the sliding sleeve moves to the opening position in the axial direction of the moving channel under the action of pressure and compresses the elastic piece, so that the control valve is opened; when the external pressure is smaller than the internal pressure of the moving channel, the elastic piece recovers deformation and drives the sliding sleeve to move to the closing position in the axial direction of the moving channel, and therefore the control valve is closed. The packer is provided with the control valve. Through the synergistic effect of the sliding sleeve and the elastic piece, the control valve can be opened and closed repeatedly, the operation efficiency is improved, and the use cost is reduced.

The invention relates to the technical field of underground differential tools, in particular to an underground differential device. The underground differential device comprises a fixed part and an action part, wherein the fixed part consists of an upper joint, an inner pipe and an outer cylinder which are concentric; the action part consists of a differential rod and a piston; the differential rod is located between the outer cylinder and the inner pipe, underground fluid flows into the space between the outer cylinder and the differential rod, and the differential rod can move along the inner pipe under the pressure effect of the underground fluid; the inner pipe is provided with a starting mechanism for fixing the position of the differential rod, and a limiting mechanism for limiting the stroke of the differential rod is arranged between the inner pipe and the differential rod. According to the underground differential device provided by the invention, the differential rod is controlled to move up and down to realize the differential action through the pressure acting on the differential rod by the underground fluid between the outer cylinder and the differential rod, and a pump body on the ground is not required to provide power for the differential device to perform the differential action, so that the ground safety and the success rate of the differential action are improved.

The anti-explosion pressure release valve comprises a mounting seat, a valve cover, an elastic mechanism and an active opening mechanism, and the mounting seat is provided with an exhaust port; the valve cover is movably arranged on the mounting seat and can close or open the exhaust port; the elastic mechanism is connected with the valve cover and the mounting seat and can apply elastic force to the valve cover to enable the valve cover to reset to the position for closing the exhaust port; the active opening mechanism is detachably installed on the installation base and can push the valve deck to move to the position where the exhaust port is opened, when the system pressure is abnormal, the pressure acts on the valve deck and overcomes the elastic force of the elastic mechanism, the exhaust port is opened, the passive pressure relief function is achieved, and safety is improved. And active pressure relief or air exchange is achieved, different use requirements are met, and the application range is wider.

The utility model discloses a special grinding wheel for thinning the back of a silicon wafer. The special grinding wheel comprises a grinding wheel device body base and a placement workbench arranged at the upper end of the grinding wheel device body base. A middle connecting adsorption disc is arranged in the middle of the placing adsorption pad, a built-in telescopic connecting body is arranged in the middle of the outer connecting column body, a stirring adjusting column is connected with the built-in telescopic connecting body through a rotating shaft, and the stirring adjusting column is rotated so that the built-in telescopic connecting body can be stretched to exhaust air in the position of the middle connecting adsorption disc; the silicon wafer placed on the placing adsorption pad can be only attached to the placing adsorption pad under the action of pressure after being adsorbed, the silicon wafer can be stably limited in an adsorption mode after being improved, friction can be increased through the placing adsorption pad, position deviation of the silicon wafer is effectively avoided, and the service life of the silicon wafer is prolonged. And the operation is simple and quick, so that the use practicability of the special grinding wheel for thinning the back of the silicon wafer can be effectively improved.

The application relates to the technical field of valve driving, and discloses a high-speed driving device and a method thereof, which comprises a cylinder body, a piston is slidably connected to the inner wall of the cylinder body, an energy storage cavity and an annular cavity are arranged at the upper part of the inner wall of the cylinder body, a buffer cavity is arranged at the lower part of the inner wall of the cylinder body, the annular cavity is communicated with the buffer cavity, the energy storage cavity, the annular cavity and the buffer cavity are all connected with an external pressure source, the energy storage cavity is connected with a first controller and a first valve, the first controller is used for controlling the opening and closing of the first valve, the annular cavity and the buffer cavity are connected with a second controller and a second valve, and the second controller is used for controlling the opening and closing of the second valve. The pressure medium of the energy storage cavity is fed in advance, when the pressure medium in the buffer cavity flows into the annular cavity, the piston can respond instantaneously, and the pressure medium does not need to be injected, under the action of the medium pressure of the energy storage cavity and the medium pressure of the annular cavity, the piston is driven downward instantaneously, and millisecond-level response of the piston is realized.

The application provides a shell and an electric core. The shell comprises a shell body and a folding part. The shell body comprises a plurality of side walls, and at least one side wall is provided with a pressure relief port. The folding part is connected with the shell body. The folding part seals the pressure relief port when in a folded state. When the air pressure in the shell reaches a pressure relief pressure, the folding part is impacted by the gas and is in an unfolded state, and the pressure relief port is in communication with the outside. In this way, the folding part in the folded state ensures the sealing of the shell. When the electric core is in thermal runaway, the folding part is impacted by the pressure of the internal gas and is opened to the unfolded state, a pressure relief channel is formed in the folding part, an exhaust port is formed at the end of the folding part, and the pressure relief port is in communication with the outside. That is, the folding part plays the role of the explosion-proof valve in the conventional technology. Compared with the prior art, the shell is designed with a simple processing mode, and the problem that the explosion-proof valve of the electric core is arranged on the shell and is difficult to process in the prior art is solved.

The utility model discloses a plate packing and winding machine, which relates to the technical field of plate packing and comprises a bottom frame, a winding device is arranged at the top end of the bottom frame, a first belt conveyor and a second belt conveyor are respectively and fixedly mounted at the top end of the bottom frame, and a pressing component is arranged at the top end of the bottom frame; the pressing assembly comprises two movable sliding plates, two sliding rods slidably penetrate through the top ends of the movable sliding plates, the outer walls of the two sliding rods are sleeved with springs, a first mounting frame is fixedly mounted at one ends of the outer walls of the two sliding rods, and a pressing roller is rotatably mounted on the inner wall of the first mounting frame; the pressing assembly can act on the surface of the film through a pressing roller with constant and appropriate pressure and roll in the length direction of the plate, the film is tightly pressed on the plate, the problems of gaps, bubbles, wrinkles and the like existing between the film and the plate are effectively solved, it is ensured that the film is tightly attached to the plate, and the production efficiency is improved. And the plastic film and the plate are attached more tightly and flatly, and the packaging effect is greatly improved.

This invention belongs to the field of clamping technology and discloses a modular dovetail clamping assembly, including a base and a rotating mechanism. The rotating mechanism includes a first bidirectional threaded shaft and a first helical gear, with the first bidirectional threaded shaft rotatably connected to the base. Through the design of structures such as sliding seats, a stabilizing mechanism, and an adjusting mechanism, the rotation of the first bidirectional threaded shaft drives two sliding seats to move synchronously in opposite directions. The bonding plate contacts and presses against the inclined edge of the dovetail groove, gradually tilting until it matches the inclination of the dovetail groove's inclined edge. As the two sliding seats continue to move in opposite directions, the pressure between the bonding plate and the inclined edge of the dovetail groove gradually increases. Furthermore, as the first piston column gradually shortens, the sliding block moves away from the bonding plate under pressure, thereby compressing the spring. Under the reaction force, the bonding plate and the inclined edge of the dovetail groove fit together more closely.

The utility model belongs to valve spare technical field relates to a kind of gas taking valve assembly with support.The utility model, including valve body main part, its characterized in that, the valve body main part has air inlet and air outlet, connecting channel is equipped between the air inlet and air outlet.The utility model in the gas taking process, gas passes through air inlet and enters connecting channel, pressure acts on the pressure slide bar in integrated elastic pressure structure, the pressure slide bar passes pressure to the pressure sensor in the monitoring piece directly opposite, pressure sensor converts pressure signal into electric signal and passes to micro MCU, micro MCU carries out analysis processing to signal, realizes the real-time monitoring to gas taking stage pressure, when pressure data appears exception, such as exceed the normal range of pre-set, micro MCU can judge that gas taking process exists fault, timely trigger alarm and other self-diagnosis function, remind user to take corresponding measure, avoid safety accident to occur.

The invention discloses a double-sided heterogeneous hose and a manufacturing method thereof, the double-sided heterogeneous hose is composed of an inner rubber layer, a reinforcing layer and an outer rubber layer, and the core of the double-sided heterogeneous hose is that the outer rubber layer and the inner rubber layer are respectively composed of a first rubber material and a second rubber material which are different in chemical composition, so that a double-sided heterogeneous structure with different performances is formed. During co-extrusion molding, the second rubber material forcibly permeates through a strip blank gap from the outer side of the reinforcing layer under the action of pressure and is adhered to the inner side to form an inner rubber layer, and the strip blank gap is filled with the inner rubber layer to form a rubber nail; and the first rubber material is adhered to the outer side of the enhancement layer to form an outer rubber layer. In the permeation process, the second rubber material remaining on the fiber surface of the outer side of the reinforcing layer is fused with the molten first rubber material to form a bonding interface, so that the inner and outer rubber layers and the reinforcing layer are tightly combined through the dual effects of the inner rubber nails and the outer fusion interface, and an interlocking structure with high peel strength is formed. According to the method, the working procedures are simplified, and stable and efficient production of the high-performance composite hose is achieved.

The present invention provides a high-speed shut-off valve having a short and repeatable closing time in the range of several milliseconds, and a drive mechanism for the same valve. [Solution] The drive unit 35 has a piston 3 slidably disposed within the cylinder housing 2. Pressure is applied to the piston, and the piston is fixed in the open position of the valve 1 by a locking device 8 using a locking body 13 and a locking element 14, the locking element 14 pushing the locking body 13 into a ring groove 10 in the outer wall of the piston. For high-speed closing of the valve 1, the locking is released, thereby accelerating the piston 3 by the applied pressure, sliding the valve mechanism 4 into the vacuum tube to close the vacuum tube. The locking body 13 has at least two frustoconical segments connected via a conical base, and the working contact surfaces of the piston 3 and the locking element 14 are fitted to these frustoconical segments, thereby generating substantially uniform surface pressure.

The utility model provides a kind of multifunctional casting machine, including the smelting furnace that can melt metal is injected into mould under the action of pressure by pressure injection port;And the mould that can be side provided with pouring gate is closed, and drive mould to move to make pouring gate close or away from the mechanical hand of the pressure injection port;Pressure injection port is set to the side of smelting furnace along horizontal line;Mechanical hand is set on base, and first drive is set on base, and it can drive mechanical hand to rotate along the axis of pressure injection port. Realize pressure casting while its mechanical hand can be driven under the first drive and rotate along the axis of pressure injection port, to realize mould and turn over along axis, so first cooling cavity can be turned over to bottom, to realize complement by the gravity of melt metal itself, this mode can realize the double complement of pressure maintaining and gravity, greatly reduce the problem of internal and external surface shrinkage of part;And its structure is simple and cost is lower.

The invention relates to the technical field of welding devices, in particular to a laser-electric arc hybrid welding device. A laser-arc hybrid welding device comprises a platform, a welding mechanism and an adjusting mechanism. And the welding mechanism is used for welding the two annular weldments. The adjusting mechanism comprises a conveying belt and an adjusting assembly, an adjusting space is formed between the upper side face of the outer side of the conveying belt and the outer side face of the annular weldment, and welding flux is placed in the adjusting space. In the welding process, the molten pool on the back face of the weld joint makes contact with the welding flux in the adjusting space, and the welding flux is heated to generate gas. Pressure formed by the gas acts on the back face of the molten pool, and generation of welding humps can be effectively restrained. And when the hump tends to increase, the welding flux in contact with the molten pool is usually increased, so that more gas is generated, and the hump inhibition effect is better. The invention provides a laser-electric arc hybrid welding device to solve the problems of poor applicability and poor effect when existing welding equipment inhibits humps from being formed in a molten pool.

This utility model relates to a detachable exterior wall plastering scraper, belonging to the field of plastering scraper technology. It includes a first scraper with guide plates fixedly installed at both ends. A material collection box is movably installed on the back of the first scraper. A pushing component is slidably installed on one side of the material collection box, and a corner plastering component is fixedly installed on one side of the material collection box near the handle. This utility model uses the guide plates on the first scraper to guide excess material from the first scraper into the material collection box, preventing excess material from falling onto the ground and contaminating it. When enough material accumulates in the material collection box, pulling the stretching head causes the pushing plate to compress the material in the collection box under the action of the push rod. The material moves to the surface of the pushing plate under pressure. Then, pushing the stretching head again causes the material in the collection box to return to the surface of the first scraper under the action of the pushing plate, thus achieving material reuse.

The utility model discloses a gas cylinder, relates to high pressure gas cylinder technical field, including bottle body, bottle body also includes bottle mouth, bottle shoulder, bottle body, bottle bottom and seal cover, seal cover and bottle mouth inner wall threaded connection, the inner wall of bottle body is fixed with the elastic lining, the elastic lining is provided along the inner wall circumference of bottle body, and the elastic lining is provided with the elastic lining. A buffer component is arranged in the bottle bottom, at least part of buffer space is arranged between the buffer component and the bottle bottom, the elastic lining and the buffer component are arranged, the elastic lining is arranged on the inner wall of the bottle body, when the pressure intensity in the bottle is increased, pressure generated by the internal pressure intensity acts on the elastic lining, and the buffer space is formed between the buffer component and the bottle bottom. And correspondingly, when the air pressure in the cylinder is increased, the internal pressure can also act on the buffering component, and the internal pressure can absorb part of the pressure through buffering of the buffering component, so that the internal high-pressure resistance of the gas cylinder is improved, and the safety of the gas cylinder is improved.

The utility model belongs to the technical field of batteries, and discloses a battery explosion-proof steel shell and a battery. The battery anti-explosion steel shell comprises a shell side wall and a shell bottom, the shell side wall is hollow, the shell bottom is connected to one end of the shell side wall in a sealed mode, the shell bottom comprises a body and a protruding part, and the periphery of the body is connected with one end of the shell side wall; the protruding part protrudes out of the side, facing the side wall of the shell, of the body in the direction away from the side wall of the shell to form a recess, and a weak connecting part is formed in the position where the protruding part is connected with the body and is linearly arranged. According to the explosion-proof steel shell of the battery, the thin weak connecting part which is used for connecting the body and the convex part is formed through the relative dislocation between the body and the convex part, and the weak connecting part is linear, so that when the internal pressure of the explosion-proof steel shell of the battery is increased, the area of the pressure acting on the weak connecting part is small, and the pressure intensity is large; according to the scheme, the explosion-proof steel shell of the battery is easier to crack from the weak connecting part for pressure relief under the action of larger pressure intensity, so that the explosion of the steel shell is prevented more timely.

The application discloses gear anti-rubbing structure and belongs to the technical field of gears. The gear anti-rubbing structure comprises a connecting shaft, a connecting rod fixedly arranged on the outer side of the connecting shaft, two limiting strips fixedly arranged on the outer edge of the connecting rod in a symmetrical mode, a rear pressing sheet slidingly connected to the outer edge of the connecting rod, and a clamping groove formed in the inner wall of the rear pressing sheet. The gear anti-rubbing structure is combined with all components, riveted together by a riveting device, and when the gear body runs within a set range of external force, the rear pressing sheet and the front wave-shaped elastic sheet play a pressure role, so that the gear body does not slip with the connecting shaft during the running of the gear body. When the external force is an acceleration force, the rear wave-shaped elastic sheet and the front wave-shaped elastic sheet lift the rear pressing sheet and the front pressing sheet, so that the gear body slips and runs, the gear body is protected from tooth rubbing and damage, and the service life of the structure is prolonged.

The utility model relates to the technical field of hose connectors, and discloses a buckling-pressing type hose connector which comprises a pipe body, a connecting pipe is arranged in the pipe body, the connecting pipe is matched with the pipe body, the diameter of the connecting pipe is smaller than that of the pipe body, buckling-pressing assemblies are arranged on the two sides of the outer wall of the pipe body, and the buckling-pressing assemblies are connected with the pipe body. The buckling and pressing assembly is matched with the pipe body and the connecting pipe and comprises a metal elastic key arranged on the outer wall of the pipe body. According to the hose connecting device, hoses needing to be connected are inserted into the hose body, the locking ring is rotated to gradually extrude the metal elastic keys along with rotation of the locking ring, the metal elastic keys are pressed into the hose body through the inner wall of the locking ring, the hoses are extruded and fixed through the fixing pieces under the pressure effect, the hoses are clamped through the fixing teeth, and connection of the hoses is achieved. Compared with a traditional threaded connection hose, the hose is fixed deeply through the fixing teeth, the hose is not prone to falling off due to the fact that threads in the connector are rubbed down, and long-time fixing of the hose is facilitated.

The pipe joint includes a flare joint body 1F, a cap nut 2, and a stop ring 3. A curved pressure-contacting slope surface 32 of the stop ring 3 contacts a slope surface 5 with reduced-diameter tip of the flare joint body 1F under pressure to establish sealing by means of mutual contact between metallic surfaces. The pipe P is grasped in a tightly pressure-contacting state using a back tooth and a front tooth formed at a tip head 37 of a substantially cylindrical thin part 35 of the stop ring 3.

This utility model discloses a quick-installation device for a muffler transition pipe, relating to the field of muffler technology. It includes a muffler housing, a first clamp arm, and a second clamp arm. An exhaust tailpipe is fixedly connected to the top of the muffler housing, and a muffler transition pipe is fixedly connected to the bottom of the muffler housing. An exhaust pipe is located below the transition pipe. The first and second clamp arms are mounted on the transition pipe. This quick-installation device applies pressure to the transition pipe and the exhaust pipe, making the connection tighter. Simultaneously, the rubber ring undergoes elastic deformation under pressure, filling the gap at the connection and further enhancing the sealing effect, ensuring that gas does not leak from the connection. For disassembly, simply loosen the fastening nut in the reverse direction, pull the bolt out of the second connecting lug of the second clamp arm, and use the hinge's movable connection characteristic to open the first and second clamp arms. The operation is simple and quick, achieving rapid installation and disassembly.

The application relates to the technical field of braking, in particular to a brake master cylinder and a linkage braking system. The brake master cylinder comprises a pump body, a first piston, a second piston and a piston push rod; the pump body is provided with a piston cavity, a first oil guide hole and a second oil guide hole; the first oil guide hole is communicated with a second chamber, the second oil guide hole is communicated with a third chamber, the first oil guide hole is used for being communicated with a foot brake pump body, and the second oil guide hole is used for being connected with a front brake or a rear brake; the piston push rod is connected with the pump body and is transmissionally connected with the first piston, and the piston push rod is used for driving the first piston to move under the driving action of an external force; wherein the second piston is used for moving in the direction of the second oil guide hole under the driving action of the first piston or the pressure action of the second chamber, so that the front brake or the rear brake brakes. The brake master cylinder can simplify the structure of the linkage braking system and reduce the use cost of the linkage braking system.