2696results about "Flanged joints" patented technology

The utility model discloses a gate valve with improved bidirectional sealing performance, which comprises a valve body, baffle rings are symmetrically arranged in the valve body, the outer side surfaces of the baffle rings are fixedly connected with the inner wall of the valve body, a gate plate is arranged on the inner sides of the baffle rings, an auxiliary pipeline is arranged above the gate plate, and the auxiliary pipeline is fixedly connected with the side surface of the valve body. Annular grooves are symmetrically formed in the surfaces of the two sides of the gate plate, sealing rings are fixedly connected to the surfaces of the inner sides of the annular grooves, a guide pipe is fixedly connected to the upper surface of the gate plate, the lower end of the guide pipe communicates with the annular grooves, the upper end of the guide pipe penetrates through the auxiliary pipeline to be connected with a hydraulic mechanism, and a driving mechanism is installed at the upper end of the auxiliary pipeline. The connecting flange is fixedly connected with the valve body. The problem that in the using process of a traditional gate valve, abrasion of a sealing ring on the gate plate sealing face is more and more serious is solved, the situation that the gate valve leaks due to the fact that the sealing performance of the gate plate is reduced after long-time use is avoided, the using sealing performance of the gate valve is improved, and the service life of the gate valve and the gate plate is prolonged.

The utility model discloses a high-temperature-resistant flash valve exhaust nozzle structure which comprises a pipe body and an energy reduction structure. The energy reduction structure comprises at least two stages of ceramic energy reduction units which are connected in series, and the ceramic energy reduction units are connected in the pipe body; the ceramic energy reduction unit comprises a first-stage energy reduction assembly and a second-stage energy reduction assembly; the first-stage energy reduction assembly comprises a first ceramic spray pipe and a first liner pipe; the first lining pipe sleeves the outer side of the first ceramic spray pipe; the first liner tube is arranged in the tube body; the second-stage energy reduction assembly comprises a second ceramic spray pipe and a second liner pipe; the second lining pipe sleeves the outer side of the second ceramic spray pipe; the second liner tube is arranged in the tube body; the end of the first ceramic spray pipe abuts against the end of the second ceramic spray pipe. And a medium flows out of the pipe body after sequentially passing through the first-stage energy reduction assembly and the second-stage energy reduction assembly from the inlet end of the pipe body. According to the multi-stage energy reduction device, the multi-stage energy reduction assemblies connected in series are adopted, medium pressure can be decomposed into stage-by-stage release, and therefore the fluid speed is effectively reduced, and dependence on a high-temperature adhesive is also avoided.

The invention discloses a rotary flange underwater sealing butt joint method for a deepwater large-diameter composite pipeline, and belongs to the technical field of submarine pipeline engineering. According to the method, aiming at the problems that a traditional flange joint is insufficient in sealing reliability in a deepwater dynamic environment and lacks a long-term monitoring means, a pressure self-adaptive sealing cavity is formed in a rotating flange disc surface, internal pressure is utilized to enhance sealing specific pressure, and a pressure sensor is integrated to monitor a sealing state in real time; and meanwhile, a pressure sensor interface is reserved to realize long-term data acquisition. The device is mainly used for installation, operation and maintenance of submarine water and oil gas pipelines, and long-term sealing safety of pipeline connectors can be effectively guaranteed.

A piping system for oil and gas in very deep water includes two opposing flanges and a seal ring between the flanges. Each flange has an annular ridge between concentric grooves. The seal ring has a radial web that connects longitudinal inner and outer sealing portions, which are received in the concentric grooves with the annular ridge received sealingly between the inner and outer sealing portions. The inner sealing portion of the seal ring is longer than the outer sealing portion. The web is as thick as or thicker than the inner and outer sealing portions. The seal ring comprises inner and outer concentric hollow cylinders having a non-uniform wall thickness and an annular rib that connects the hollow cylinders together, where one cylinder is longer than the other and where the rib has a longitudinal thickness that is as great as the radial thickness of the walls of the hollow cylinders.

The utility model discloses a petroleum manifold connecting structure and a manifold set. The petroleum manifold connecting structure comprises a left connector, a right connector, a clamping groove, a petroleum pipe, a fixing hole, a hexagon nut, a fixing protruding block, a fixing groove, a small-caliber sealing ring, a large-caliber sealing ring, a lantern ring and a nut. A left joint and a right joint are arranged on the outer wall and the inner wall of the petroleum pipe, and the petroleum pipe is embedded into clamping grooves of the left joint and the right joint to be fixed; the edge of the right side face of the left connector and the edge of the left section of the right connector are provided with a plurality of fixing protruding blocks and L-shaped fixing grooves respectively, the fixing protruding blocks are embedded into the fixing grooves to be locked, the left connector is embedded into the right connector to achieve firm connection, and then the left connector and the right connector are connected through hexagon nuts to be reinforced. According to the connecting mechanism, flowing of petroleum is not affected, the connecting mechanism is not prone to being damaged and destroyed, all connection is detachable, and disassembly and replacement are convenient.

The steam turbine pipeline flange self-adaptive centering support comprises a telescopic base, a first supporting seat, an adjusting assembly, a limiting assembly and a rotary driving assembly, the other end, in the first direction, of the first supporting seat is used for supporting a pipeline, the adjusting assembly comprises a bottom support and a mounting shell part, and the mounting shell part is rotationally arranged on the bottom support; the limiting assembly comprises a driving part and a telescopic rod, one end of the telescopic rod is arranged on the mounting shell, the other end of the telescopic rod is used for being inserted into a hole of the flange plate, the driving part is connected with the telescopic rod to drive the telescopic rod to stretch out and draw back, and the rotary driving assembly is connected with the mounting shell. By means of the centering support, high precision in the butt joint process is guaranteed, potential safety hazards such as poor pipeline sealing and medium leakage caused by inaccurate centering are reduced, automatic alignment of holes of a flange plate is achieved, traditional manual visual inspection and manual adjustment modes are eliminated, the problem of hole position deviation is effectively solved, and the production efficiency is improved. And therefore, stable operation of the steam turbine unit is guaranteed.

The utility model relates to the technical field of pipelines, and discloses a sealing device of a compensator, which comprises a flange plate, a butt joint cylinder is fixedly arranged on the side wall of the flange plate, and a sealing assembly is arranged in the butt joint cylinder. According to the sealing device of the compensator, by arranging the sealing assembly, when flange plates are in butt joint installation, a bolt pushes an abutting rod to be matched with a disc and a push rod, so that a compressed air bag is extruded, inert gas in an expansion air bag can enter an annular air bag through a connecting pipe, and the size of the annular air bag is increased; by means of the arc-shaped limiting groove, the expansion air bag cannot excessively shift in the horizontal direction, meanwhile, the arc-shaped outer surface of the expansion air bag can increase the coverage area formed by unfolding, and therefore a gap in the connecting position between the butt joint cylinder and an external pipeline is effectively blocked, and the sealing effect between the whole compensator and the pipeline is guaranteed; and the anti-risk capability of the device is improved.

The utility model discloses an embedded connecting structure of a protective pipe, belongs to the technical field of pipeline connection, and solves the technical problem that the connecting position of an existing pipeline is directly exposed outside and is easy to damage. The protective pipe comprises protective pipes which are connected with each other, connecting parts are arranged on the end faces of the connecting ends of every two adjacent protective pipes, the connecting parts are connected with connecting flanges, the outer circles of the connecting flanges of every two adjacent protective pipes are jointly connected with connecting clamping rings in a buckled mode, and the connecting clamping rings are connected with the connecting flanges of every two adjacent protective pipes through first fasteners respectively. The outer circle diameter of the connecting clamping ring is equal to or smaller than that of the protective pipe. And after the overall outer layer of the protective pipe and the connecting position is coated with the anti-corrosion material, the connecting position is difficult to find, weak points at the connecting position of the protective pipe are hidden, and the attractive effect is achieved.

A ring seal includes an annular body defining an axial hole therethrough for fluid passage in an axial direction and having a radial plane that is perpendicular to the axial direction. An axial side of the ring seal includes deformable annular protrusions extending from the annular body in an axial direction to first and second apexes, which are configured to deform upon engagement with a first planar sealing surface and define a trough therebetween to engage a first annular rounded sealing protrusion or ring. So configured, the ring seal can seal two different types of flow components.

The invention belongs to the technical field of pipeline safety reinforcement, and particularly relates to an existing gas pipeline flange joint reinforcing device which comprises a bottom plate, two outer-layer sealing pieces arranged symmetrically in the axial direction, an inner-layer sealing assembly and a detection assembly. A first arc-shaped sliding frame and a second arc-shaped sliding frame which are symmetrically arranged are connected to the top end of the bottom plate in a sliding mode, an outer-layer sealing piece is connected between the first arc-shaped sliding frame and the second arc-shaped sliding frame in a clamped mode, an inner-layer sealing assembly is arranged on the inner wall of the outer-layer sealing piece, and the inner-layer sealing assembly and the outer-layer sealing piece are each divided into two half bodies of the same structure in the axial direction. When leakage occurs at the flange joint, the detection assembly responds to the pressure change and outputs a signal, through the double-layer staggered joint sealing structure and the detection system, the supporting and reinforcing problems of the flange joint of the gas pipeline in urban underground construction are solved, real-time monitoring and early warning of leakage are achieved, and the reliability of the gas pipeline is improved. And a guarantee is provided for safe operation of the gas pipe network in a complex construction environment.

The utility model relates to the technical field of ventilating ducts, and discloses a stainless steel ventilating duct sealing structure which comprises a connecting pipe, a conical clamping block is fixedly connected to one side of the surface of the connecting pipe, an inserting pipe is inserted into the conical clamping block, a fixing pipe is inserted into the outer surface of the inserting pipe, and a fixing ring is fixedly connected to one end of the fixing pipe. A sliding groove is formed in the outer surface of the fixing ring, a clamping assembly is slidably connected into the sliding groove, the outer surface of the connecting pipe is in threaded connection with a threaded ring, and one side of the threaded ring is fixedly connected with a sealing ring. According to the stainless steel ventilation pipeline sealing structure, through the arrangement of the connecting pipe, the conical clamping block and the clamping assembly, when a worker installs a ventilation pipeline, the connecting pipe can be inserted into the fixing pipe, the conical clamping block slides relative to the inclined face of the clamping block, the conical clamping block penetrates into the fixing pipe, and then the conical clamping block is clamped through the clamping block; and a worker can quickly butt joint the ventilation pipeline.

An electrically isolating gasket is disclosed wherein a coating layer is disposed on at least one conductive surface, and in some embodiments, on all surfaces or at least all of the conductive surfaces. The electrically isolating gasket includes a core gasket component, a ring seal component, and a non-conductive inner seal component. The coating layer can be, for example, polyimide, polyamide, ceramic, and aluminum oxide.

This invention relates to a fluid sealing device comprising a sealing member comprising a first surface and an opposite second surface. A first region of the first surface for forming a first seal about an aperture of a process component containing a fluid, and an inner region of the first surface to be exposed to the fluid via the process component aperture. A restraining member providing a support surface facing the second surface, a perimeter portion of the restraining member interfacing with a first region of the second surface, the first regions of the first and second surfaces corresponding with a first region of the sealing member. An inner region of the second surface spaced from the support surface to form a cavity between the inner region of the second surface and the supporting surface at least in an unpressurised condition. The inner regions of the first and second surfaces corresponding with an inner region of the sealing member, the inner region of the sealing member moveable towards and away from the support surface under action of a pressure of the fluid on the inner region of the first surface to provide an indication of the pressure.

The invention particularly relates to a flexible telescopic vacuum pipeline based on pneumatic driving, and solves the problems of high working complexity, low efficiency, inaccuracy and uncontrollability in the mounting and dismounting process of the existing vacuum pipeline. The vacuum pipeline comprises a fixed flange, an inner corrugated pipe, an outer corrugated pipe, a lap joint flange, an air hole and an air pipe, one end of the inner corrugated pipe and one end of the outer corrugated pipe are respectively and fixedly connected with the inner end of the fixed flange, the other end of the inner corrugated pipe and the other end of the outer corrugated pipe are respectively and fixedly connected with the inner end of the loose flange, and an annular sealing cavity is formed among the inner corrugated pipe, the outer corrugated pipe, the fixed flange and the loose flange; the inner corrugated pipe and inner cavities of the fixed flange, the lap joint flange, the external high-pressure pipe and the external low-pressure pipe form a vacuum cavity; an air hole is formed in the inner end of the fixing flange, one end of the air pipe is connected with the air hole, the other end of the air pipe is connected with external air source equipment, and the air pipe is used for inflating the annular sealing cavity to extend the vacuum pipeline or exhausting air to shorten the vacuum pipeline.

The utility model discloses a connecting flange capable of adapting to oil drainage of transformers of various specifications, which belongs to the technical field of transformer maintenance tools and comprises a mounting plate, a flow guide pipe is mounted on one side of the mounting plate, guide rails are mounted on the mounting plate on two sides of the flow guide pipe, and a sliding plate is slidably mounted on the guide rails. The other side of the mounting plate is arranged smoothly, the whole flange has the advantages of being capable of being matched with transformer oil drainage ports of different specifications, convenient to mount and adjust and capable of improving the adaptability and efficiency of oil drainage operation, the problem that a traditional flange is poor in adaptability is solved, and by arranging the structures of the mounting plate, the flow guide pipe, the guide rail, the sliding plate, the adjusting rod, the pressing plate and the like, the practicability is high. The position of the sliding plate can be adjusted in a sliding mode through the guide rail, the pressing plate is connected in cooperation with the adjusting rod, the distance and the position of the pressing plate and the sliding plate can be flexibly adjusted according to the sizes and installation requirements of transformer oil drainage ports of different specifications, and adaptive connection of the transformer oil drainage ports of the various specifications is achieved.

The utility model relates to liquid level meter measurement technical field, specifically disclose a liquid level meter positive pressure sealing connection structure, including flange no.

A flexible tube (4) for conveying abrasive materials comprising a tubular body (8) extending along a main extension axis (Z-Z), the tubular body (8) having a thickness (12) extending from an inner side wall (16), which delimits an inner cavity (20) used for transporting abrasive material, to an outer side wall (24), opposite to said inner side wall (16) along a radial direction (R-R), perpendicular and incident to said main extension axis (Z-Z), wherein said tubular body (8) comprises a covering layer (28) at the outer side wall (24). The tubular body (8) comprises an elastomeric matrix (32) in which there are at least partially embedded circular disks (36) having diameter (D) and flat faces, made of ceramic material, having a first flat face (40) directly facing said inner cavity (20) so as to at least partially form the inner side wall (16) and a second flat face (44) embedded in the elastomeric matrix (32).

The utility model provides a resin preparation device, which belongs to the technical field of resin preparation, aims to solve the problems that a flange bolt is influenced by alternating load, so that the pretightening force is attenuated, the compression amount of a gasket is insufficient, and a connecting interface leaks, and comprises a first reaction kettle and a second reaction kettle arranged on the outer side of the first reaction kettle; the two conveying pipelines are fixedly connected between the discharge port of the first reaction kettle and the feed port of the second reaction kettle respectively; the outer side of the conveying pipeline binding surface is fixedly connected with a connecting flange; a sealing gasket is arranged on the inner side of the connecting flange; the plurality of positioning bolts are circumferentially arranged and are in threaded connection with the inner sides of the connecting through holes of the connecting flanges; the sealing auxiliary mechanism is arranged between the positioning bolt and the connecting flange; the phenomena of leakage of a connection interface and material waste are greatly avoided, the operation stability of the reaction kettle and the performance of the BT resin are ensured, and the safety during preparation of the BT resin is further improved.

The utility model relates to the technical field of bottom valve seats for shock absorbers, and discloses a long-service-life bottom valve seat for an automobile shock absorber, which comprises a valve seat, the valve seat comprises a shell and a connecting pipe, a pressure reduction structure is arranged on the valve seat, and a sealing assembly is arranged on the valve seat. The lead screw drives the rack to move through the threaded block so as to control the gear to rotate, the gear drives the pressure reducing plate to rotate through the second rotating shaft, the speed and pressure of oil are finely controlled, the ideal pressure reducing effect is achieved, the speed of high-pressure oil is effectively controlled, and the flow speed and pressure are reduced before the high-pressure oil enters the valve plate. Therefore, direct impact and abrasion to the valve plate are reduced, the service life of the valve plate is prolonged, the maintenance cost is reduced, the pressure reduction plate is adjusted more smoothly, the reverse force caused by oil pressure change to the valve plate is reduced, and the torque requirement during operation is further reduced.

The utility model belongs to natural gas hydrogen terminal equipment pressure stabilizing field especially natural gas hydrogen terminal equipment pressure stabilizing interface, in view of the single installation mode of traditional gas pressure stabilizer, lack of support and easy to loosen and leak etc. problem, present the following scheme, it includes flange type pressure stabilizing valve main part, is equipped with internal thread in the flange type pressure stabilizing valve main part import and export inner wall, compatible screw thread and flange two kinds of connecting mode, adapt to the demand of many scenes. The recessed cylinder and U-shaped support frame are arranged on the top of the mounting seat, which can bear the weight and vibration impact of the pressure stabilizing valve to prevent leakage. The adjuster in the recessed cylinder can accurately adjust the height of the support frame by rotating the hand wheel, which is suitable for different types of pressure stabilizing valves and saves installation and debugging time. In addition, a loosening preventer is also provided. Rotating the butterfly screw makes the arc plate and the rotating rod tightly contact. The second rubber pad generates friction to prevent the rotating rod from rotating, keep the height of the support frame stable, ensure that the pressure stabilizing valve is always in a good support state, and ensure the safe and stable operation of the system.

The fire-fighting water intake comprises a protective well, a well lid covering a well mouth of the protective well and a straight pipe connected with a water outlet of the semi-underground fire-fighting water pool, the end, away from the semi-underground fire-fighting water pool, of the straight pipe is connected with a vertical pipe, and a top port of the vertical pipe extends into the protective well and is detachably connected with a sealing plate. A through hole is formed in the sealing plate and connected with a connector pipe, and a pipe opening of the connector pipe is provided with an inner buckling type water suction pipe connector used for being connected with a water taking pipe of a fire fighting truck. According to the fire-fighting water intake for the semi-underground fire-fighting pool, safe and rapid water intake of a fire-fighting truck is ensured, and the fire-fighting truck is ensured to fully utilize the water quantity of the fire-fighting pool in a fire disaster period.

The utility model relates to a compensator technical field especially relates to a safety type wear -resisting compensator, the utility model adopts the technical scheme: including two combination together's first pipeline main part structure and second pipeline main part structure, first pipeline main part structure and second pipeline main part structure adjacent one side's outside is equipped with compensator combination flange seat, and two compensator combination flange seats are connected together through the connection combination pole of circumferential distribution between them, and the outside position of first pipeline main part structure and second pipeline main part structure is provided with compensator connection sealing sleeve, and the side of compensator combination flange seat close to compensator connection sealing sleeve is equipped with a circle cylindrical compensation limit cooperation post, the utility model has the advantages of: adopt the mode of double sealing to carry out combination connection, and the sealing of connection position is better, and the main position of compensator can realize double compensation limit cooperation through the setting limit structure, and the damage to flange structure when using can be effectively reduced.

The utility model discloses a kind of connector structures suitable for DN110~1200 composite pipe, specifically is: in the end of two sections of composite pipe injection molding one connector with stepped shape outer diameter, when two composite pipes are connected, the big head of two connectors is attached;Flange connection or hot melt butt joint connection is used at the step of two connectors;Several holes are provided on the composite pipe at the connector, and the hole is the tensile column of connector.The utility model is suitable for pipe diameter DN110-DN1200 of water supply and drainage, chemical pipeline etc., satisfies 10.0MPa high pressure, 6.4MPa medium pressure, 1.6MPa low pressure demand.

The utility model discloses a quick-release threaded pipe, belongs to the technical field of pipeline structures, and provides a threaded pipe which can be directly and quickly disassembled and assembled without using tools, and comprises a splicing pipe and a push-pull handle, the main body part of the splicing pipe is a main pipe body, the middle part of the main pipe body is provided with an outer convex conical ring, and the end part of the main pipe body is provided with a connecting end; external threads are arranged on the outer side face of the connecting end, the two push-pull handles are fixedly connected through the connecting piece, the outer convex conical ring is located between the two push-pull handles and provided with a pair of symmetrical circular truncated cones, the axes of the two circular truncated cones are collinear with the axis of the main pipe body, each push-pull handle comprises a force application disc, and the inner wall of each force application disc is provided with an inner concave conical surface. The push-pull handle structure for rotation constraint is designed in the middle of the splicing pipe with the threaded structures at the two ends, and when the threaded pipe is disassembled and assembled, component force in the tangential direction of the spiral line is provided, so that operation can be achieved without using a wrench tool, the disassembly and assembly operation is simplified, and the disassembly and assembly efficiency is improved.

The utility model relates to the technical field of pipeline connection anti-leakage, in particular to an anti-leakage device of a heating, ventilation and fire fighting system, which comprises two pipelines, flanges are arranged on the pipelines, the two flanges are connected through a first bolt, a groove is arranged at the end of each pipeline, a first sealing ring is arranged in each groove, and sealing covers are sleeved outside the two flanges. A jacking mechanism is arranged on the sealing cover; the jacking and pressing mechanism is used for jacking and pressing the two flanges and pressing the first sealing ring between the two flanges. Through cooperation of the sealing cover and the jacking mechanism, extra pressure can be applied to the two flanges, the first sealing ring is further pressed, the sealing effect is enhanced, and the anti-leakage performance of the connecting position is remarkably improved; the structure is simple, installation can be achieved without complex operation, the problem of leakage caused by aging of a sealing piece and loosening of a connecting piece in traditional pipeline connection is solved, resource waste can be reduced, the equipment damage probability can be lowered, and stable operation of a heating, ventilation and fire fighting system is guaranteed.

The utility model provides a kind of sound insulation and noise reduction composite air pipe structure, it is related to composite air pipe technical field, including composite air pipe assembly, sound insulation component is provided on the composite air pipe assembly, the side of the composite air pipe assembly is provided with mounting assembly, the composite air pipe assembly includes air pipe main body and protective support cover.The utility model is by sound absorption box and is set in the inside of air pipe main body, cooperate sound absorption hole is favorable to absorb part noise, in turn is favorable to weaken part noise, by sound insulation board and is set in the outside of air pipe main body, it is favorable to further weaken noise, reduce its diffusion to outside, by both part is favorable to realize sound insulation and noise reduction, reduce noise transmission to external environment, in turn reduce noise pollution, by the outside of protective support cover is provided with buffer pad, it is favorable to absorb part vibration when air pipe main body operates, reduce vibration diffusion to building structure by support.

The utility model discloses a desulfurization spraying device, and belongs to the technical field of desulfurization spraying system pipelines. The desulfurization tower comprises a desulfurization tower body, a plurality of coil pipes are arranged outside the desulfurization tower body, every two adjacent coil pipes are connected and communicated with each other through a first flange assembly, and the outer walls of the coil pipes are communicated with a first hose and a second hose respectively; according to the device, the first flange assembly, the second flange assembly, the first flange plate, the second flange plate, the threaded groove and the flange screws are arranged, the coil pipe can be disassembled by rotating the screws on the first flange assembly and the second flange assembly, and the short spraying pipe and the long spraying pipe can be disassembled by rotating the flange screws; according to the pipeline blockage prevention device, the pipeline blockage prevention effect is achieved, then workers can conveniently replace and clean the blocked pipeline, the pipeline replacement and cleaning become easier, the workers do not need to enter the tower to replace and clean the pipeline, and therefore the working safety of the workers is improved.

To provide a temporary fastening jig for temporarily fastening a flange joint to be fastened, capable of supporting an inner surface packing sandwiched between the flange joint and the temporary fastening jig at an appropriate position.SOLUTION: A temporary fastening jig 10 for temporarily fastening a flange joint 5 to be fastened includes a cylindrical pin portion 11 to be inserted into an 6b of a bolt hole of the flange joint 5, and a head portion 16 having an outside diameter larger than an inside diameter of the 6a of the bolt hole, and the pin portion 11 has, on a cylindrical side surface thereof, a packing support plane 13 dug down to support a disk-shaped inner surface packing 9 installed between the flange joints 5. The packing support plane 13 is a plane parallel to a tangential plane in contact with the cylindrical side surface of the pin portion 11.SELECTED DRAWING: Figure 1

The invention relates to the technical field of pipeline structures, in particular to a pipeline socket with a water stop wing, comprising: a pipeline fitting, which comprises a pipe fitting body, one end of the pipe fitting body is provided with an insertion pipe, and the other end of the pipe fitting body is provided with an annular socket; the butt joint fittings are used for connecting the adjacent pipeline fittings; and the reinforcing accessory is arranged on the outer wall of the pipe fitting body. A traditional rigid and integrally-formed water stop ring is divided into a plurality of water stop wing pieces which are independently arranged in the socket guide groove in a surrounding mode, the water stop wing pieces are installed in a hinged mode through the hinge shaft bases, elastic supporting is provided through the springs, and therefore each water stop wing plate can independently conduct small-amplitude self-adaptive deflection relative to the pipe body; the problem that stress concentration is generated at the root of the water stop structure when radial displacement or angular deflection occurs at the pipeline connecting position is fundamentally solved, the risk that the pipe body cracks is remarkably reduced, and the structural safety and durability of a connector under the complex working condition are greatly improved.

The utility model relates to the technical field of PVC (polyvinyl chloride) pipes, in particular to a tensile PVC pipe which comprises a high-toughness inner layer, a first connecting pipe and a second connecting pipe. The outer side wall of the high-toughness inner layer is fixedly connected with a concave-convex structure layer, the first connecting pipe is fixedly connected to one end of the high-toughness inner layer, the second connecting pipe is fixedly connected to the other end of the high-toughness inner layer, and the end, close to the high-toughness inner layer, of the first connecting pipe is fixedly connected with a wear-resistant outer layer. The high-toughness inner layer preliminarily disperses tensile stress, the concave-convex structure layer is in butt joint with the recesses of the high-toughness inner layer through the protrusions to enhance binding force, the net-shaped reinforcing layer further disperses multidirectional tensile stress, and the fiber spiral layer provides additional support for the wear-resistant outer layer and effectively disperses transmitted tensile stress. Through the synergistic effect of the layers of different materials and structures, step-by-step dispersion of the tensile stress by the PVC pipe is realized.