A bent pipe type steel-plastic conversion pipe fitting joint assembly

Abstract

The present invention belongs to the technical field of bent-tube steel-plastic conversion pipes, and in particular relates to a bent-tube steel-plastic conversion pipe fitting joint assembly, comprising a steel pipe end joint, a connecting pipe and a plastic pipe end joint, wherein the steel pipe end joint and the plastic pipe end joint are respectively inserted into mechanical sealing structures at both ends of the connecting pipe, the mechanical sealing structure is fixedly connected to a driving structure arranged on the outside of the connecting pipe, an edge shock-absorbing structure is provided between the inner wall of the connecting pipe and the mechanical sealing structure, and a pneumatic sealing structure is provided between the steel pipe end joint and the connecting pipe. When vibration occurs, the edge shock-absorbing structure plays a buffering role to prevent the steel pipe end joint, the connecting pipe and the plastic pipe end joint from being damaged by vibration and causing losses, and at the same time prevent the steel pipe end joint, the connecting pipe and the plastic pipe end joint from being offset in position among the three under vibration conditions, thereby causing overflow of the fluid therein.

Description

Technical Field

[0001] The invention belongs to the technical field of curved tube type steel-plastic conversion tubes, and in particular relates to a curved tube type steel-plastic conversion pipe fitting joint assembly. Background Art

[0002] In the field of natural gas and other fluid transportation pipelines, commonly used pipelines are usually metal pipelines such as steel pipes and plastic pipelines made of polyethylene. When the steel pipe end pipe joint and the plastic pipe end pipe joint are connected, a steel-plastic conversion pipe fitting joint assembly is required for connection. The existing steel-plastic conversion pipe fitting joint assembly does not have a shock-absorbing function. When used in harsh environments such as those prone to vibration, it is easy to cause damage to the pipe fittings and fluid spillage.

[0003] For example, the patent application number is CN202311108198.0, which is a bent pipe steel-plastic conversion pipe fitting joint assembly, including a steel-plastic conversion pipe, a pipe is provided at the end of the steel-plastic conversion pipe, a connecting pipe is provided at the end of the steel-plastic conversion pipe close to the pipe, a sealing ring is fixedly connected to the inner wall of the connecting pipe, a sliding rod is fixedly connected to the inner wall of the sealing ring, and a threaded rod is rotatably connected to the inside of the sealing ring. However, the disadvantage of this technical solution is that it does not have a shock-absorbing function. When used in harsh environments where vibration is likely to occur, it is easy to cause damage to the pipe fittings and fluid overflow. Summary of the invention

[0004] The purpose of the present invention is to provide a curved pipe type steel-plastic conversion pipe fitting joint assembly to solve the problems in the prior art. The specific technical solution is as follows:

[0005] A curved pipe type steel-plastic conversion pipe fitting joint assembly comprises a steel pipe end joint, a connecting pipe and a plastic pipe end joint. The steel pipe end joint and the plastic pipe end joint are respectively inserted into mechanical sealing structures at both ends of the connecting pipe. The mechanical sealing structure is fixedly connected to a driving structure arranged on the outside of the connecting pipe. An edge shock absorbing structure is provided between the inner wall of the connecting pipe and the mechanical sealing structure. A pneumatic sealing structure is provided between the steel pipe end joint and the connecting pipe.

[0006] Furthermore, the driving structure includes a handwheel, which is rotatably connected to the end of the connecting tube, the handwheel is meshed with a gear at one end of a rotating rod for transmission, the middle part of the rotating rod is rotatably connected to the outside of the connecting tube, and a gear 1 is fixed to the other end of the rotating rod, and a notch is provided on the side of the gear 1.

[0007] Furthermore, the gear one and gear two are meshed for transmission, the gear two rotates in the sealing tube, the sealing tube is fixed on the central shock-absorbing structure, the central shock-absorbing structure is fixedly connected to the central column through four sets of connecting rods one, the central column is slidingly connected to the mechanical sealing structure, the gear two is threadedly connected to the threaded rod, the threaded rod slides in the sealing tube, fillers are provided at the sliding connections between the two ends of the sealing tube and the threaded rod, and the ends of the threaded rod are fixedly connected to the mechanical sealing structure.

[0008] Furthermore, the central shock-absorbing structure includes a shock-absorbing ring 1, which is fixedly connected to the sealing tube, and is slidably connected to a support ring seat 1, which is fixed in the connecting tube, and a plurality of shock-absorbing springs 1 are evenly distributed between the shock-absorbing ring 1 and the support ring seat 1, and a sealing layer 1 is provided at the connection between the shock-absorbing ring 1 and the support ring seat 1, and the shock-absorbing ring 1 is fixedly connected to the central column through four sets of connecting rods 1.

[0009] Furthermore, the mechanical sealing structure includes a sliding tube, which is fixedly connected to the end of the threaded rod, and the sliding tube is slidably connected to the outside of the center column. The end of the center column is fixedly connected to the lower end of four support rods, and the upper ends of the four support rods are rotatably connected to the ends of four straight rods respectively. The four straight rods are fixedly connected to four side rods respectively, and the front ends of the four side rods are rotatably connected to four inner pressure plates respectively. The steel pipe end joint is inserted into the sealing ring, and the four inner pressure plates squeeze the horizontal edge of the sealing ring tightly against the inner side of the steel pipe end joint.

[0010] Furthermore, a slider is slidably connected to the straight rod, the slider is rotatably connected to one end of connecting rod two, the other end of connecting rod two is rotatably connected to the sliding tube, the slider is rotatably connected to one end of connecting rod three, the other end of connecting rod three is hingedly connected to one end of connecting rod four, the middle part of connecting rod four is rotatably connected to the end of the straight rod, the other end of connecting rod four is rotatably connected to the side pressure plate, a spring two is provided between the slider and the end of the straight rod, and the four side pressure plates squeeze the vertical edge of the sealing ring tightly against the edge of the steel pipe end joint port and the side wall of the edge shock-absorbing structure.

[0011] Furthermore, the edge shock-absorbing structure includes a shock-absorbing ring 2, which is slidably connected to a support ring seat 2, which is fixed on the inner wall of the connecting tube, and a plurality of shock-absorbing springs 3 are evenly distributed between the shock-absorbing ring 2 and the support ring seat 2. A sealing layer 2 is provided at the sliding connection between the shock-absorbing ring 2 and the support ring seat 2, and four side pressure plates squeeze the vertical edge of the sealing ring tightly against the edge of the steel pipe end joint port and the side wall of the shock-absorbing ring 2, and the outer wall of the steel pipe end joint fits with the shock-absorbing ring 2.

[0012] Furthermore, the pneumatic sealing structure includes an airtight sealing seat, which is fixed in the connecting pipe. The airtight sealing seat is provided with a groove, in which an airtight sealing ring is fixed. An air storage chamber is provided in the airtight sealing seat, and the airtight sealing ring is connected with the air storage chamber through a connecting pipe. After the airtight sealing ring is inflated, it is tightly attached to the outer wall of the steel pipe end joint.

[0013] Furthermore, a piston is slidably connected in the air storage chamber, a sealing gasket is provided at the end of the piston, the piston is connected to one end of the support rod three through a connecting bent rod, and the other end of the support rod three is fixedly connected to the hand wheel.

[0014] Furthermore, a check structure is provided on the side of the airtight sealing seat, and the check structure includes a second support rod, which is fixed to the side of the airtight sealing seat. A pawl is rotatably connected to the second support rod, and a torsion spring is provided between the second support rod and the pawl. The front end of the pawl is clamped on the bevel teeth arranged in the handwheel.

[0015] The advantages of the present invention are:

[0016] 1. An edge shock-absorbing structure is provided between the inner wall of the connecting pipe and the mechanical sealing structure. When vibration occurs, the edge shock-absorbing structure acts as a buffer to prevent the steel pipe end joints, connecting pipes and plastic pipe end joints from being damaged by vibration and causing losses. At the same time, it prevents the steel pipe end joints, connecting pipes and plastic pipe end joints from being offset in position among the three under vibration conditions, thereby causing overflow of the internal fluid.

[0017] 2. The steel pipe end joint and the plastic pipe end joint are respectively plugged into the two ends of the connecting pipe. Mechanical sealing structures are provided at both ends of the connecting pipe. At one end of the connecting pipe, the mechanical sealing structure is driven by the driving structure to seal the steel pipe end joint. At the other end of the connecting pipe, another mechanical sealing structure is driven by another driving structure to seal the plastic pipe end joint. The steel pipe end joint and the plastic pipe end joint can be quickly installed on both ends of the connecting pipe or removed from both ends of the connecting pipe through the driving structure, which is convenient for maintenance or replacement.

[0018] 3. A pneumatic sealing structure is provided between the steel pipe end joint and the connecting pipe, and a pneumatic sealing structure is also provided between the plastic pipe end joint and the connecting pipe. The pneumatic sealing structure further increases the sealing between the steel pipe end joint and the connecting pipe, and the sealing between the plastic pipe end joint and the connecting pipe. The pneumatic sealing structure can change its shape within a certain space. Therefore, when there is a slight offset between the steel pipe end joint and the connecting pipe, the upper and lower ends of the pneumatic sealing structure can also be tightly attached to the steel pipe end joint and the connecting pipe, further preventing the fluid from overflowing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the mechanical seal structure of the present invention;

[0021] Figure 3 for Figure 2 A partial enlarged view of the middle part;

[0022] Figure 4 It is a schematic diagram of the non-return structure of the present invention;

[0023] Figure 5 It is a schematic diagram of the central shock absorbing structure of the present invention;

[0024] Figure 6It is a schematic diagram of the driving structure of the present invention;

[0025] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0026] Figure 8 for Figure 6 A partial enlarged view of point C in the middle;

[0027] Fig. 9 Schematic diagram of the pneumatic sealing structure of the present invention Figure 1 ;

[0028] Fig.10 Schematic diagram of the pneumatic sealing structure of the present invention Figure 2 ;

[0029] Fig.11 Schematic diagram of the pneumatic sealing structure of the present invention Figure 3 ;

[0030] Fig.12 for Fig.11 A partial enlarged view of point D in the middle;

[0031] Description of the markings in the figure:

[0032] Steel pipe end joint 1; connecting pipe 2; plastic pipe end joint 3; hand wheel 4; rotating rod 5; gear 1 6; gear 2 7; sealing tube 8; shock absorbing ring 1 9; support ring seat 1 10; shock absorbing spring 1 11; sealing layer 1 12; connecting rod 1 13; center column 14; threaded rod 15; sliding tube 16; support rod 1 17; straight rod 18; side rod 19; inner pressure plate 20; connecting rod 2 21; slider 22; connecting rod 3 23; spring 2 24; connecting rod 4 25; side pressure plate 26; sealing ring 27; shock absorbing ring 2 28; support ring seat 2 29; shock absorbing spring 3 30; sealing layer 2 31; oblique teeth 32; support rod 2 33; ratchet 34; torsion spring 35; air sealing seat 36; air sealing ring 37; air storage chamber 38; connecting pipe 39; support rod 3 40; connecting bent rod 41; piston 42; sealing pad 43. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] Embodiment 1

[0036] like Figure 1-12 As shown, a curved pipe type steel-plastic conversion pipe fitting joint assembly includes a steel pipe end joint 1, a connecting pipe 2 and a plastic pipe end joint 3. The steel pipe end joint 1 and the plastic pipe end joint 3 are respectively inserted into the mechanical sealing structures at both ends of the connecting pipe 2. The mechanical sealing structure is fixedly connected to the driving structure arranged on the outside of the connecting pipe 2. An edge damping structure is arranged between the inner wall of the connecting pipe 2 and the mechanical sealing structure. A pneumatic sealing structure is arranged between the steel pipe end joint 1 and the connecting pipe 2.

[0037] The working principle of the above technical solution is as follows: the steel pipe end joint 1 and the plastic pipe end joint 3 are respectively plugged into the two ends of the connecting pipe 2, and both ends of the connecting pipe 2 are provided with mechanical sealing structures. At one end of the connecting pipe 2, the mechanical sealing structure is driven by a driving structure to seal the steel pipe end joint 1, and at the other end of the connecting pipe 2, another mechanical sealing structure is driven by another driving structure to seal the plastic pipe end joint 3. The steel pipe end joint 1 and the plastic pipe end joint 3 can be quickly installed at both ends of the connecting pipe 2 or disassembled from both ends of the connecting pipe 2 through the driving structure, which is convenient for maintenance or replacement;

[0038] An edge shock-absorbing structure is provided between the inner wall of the connecting pipe 2 and the mechanical sealing structure. When vibration occurs, the edge shock-absorbing structure plays a buffering role to prevent the steel pipe end joint 1, the connecting pipe 2 and the plastic pipe end joint 3 from being damaged by vibration and causing losses. At the same time, it prevents the steel pipe end joint 1, the connecting pipe 2 and the plastic pipe end joint 3 from being offset in position among the three under vibration, thereby causing the phenomenon of overflow of the fluid therein;

[0039] A pneumatic sealing structure is provided between the steel pipe end joint 1 and the connecting pipe 2, and a pneumatic sealing structure is also provided between the plastic pipe end joint 3 and the connecting pipe 2. The pneumatic sealing structure further increases the sealing between the steel pipe end joint 1 and the connecting pipe 2, and the sealing between the plastic pipe end joint 3 and the connecting pipe 2. The pneumatic sealing structure can change its shape within a certain space. Therefore, in the case of a slight deviation between the steel pipe end joint 1 and the connecting pipe 2, the upper and lower ends of the pneumatic sealing structure can also be tightly attached to the steel pipe end joint 1 and the connecting pipe 2, further preventing the occurrence of fluid overflow;

[0040] In addition, the driving structure is fixedly connected to the pneumatic sealing structure, and the driving structure can simultaneously control the mechanical sealing structure and the pneumatic sealing structure to seal the steel pipe end joint 1, with strong linkage, convenient operation, and quick and easy installation and disassembly.

[0041] Embodiment 2

[0042] like Figure 1-12 As shown, the driving structure includes a hand wheel 4, which is rotatably connected to the end of the connecting pipe 2, and the hand wheel 4 is meshed with a gear at one end of a rotating rod 5 for transmission, and the middle part of the rotating rod 5 is rotatably connected to the outside of the connecting pipe 2, and a gear 6 is fixed to the other end of the rotating rod 5, and a notch is provided on the side of the gear 6;

[0043] The gear 1 6 and the gear 2 7 are meshed for transmission, the gear 2 7 rotates in the sealing tube 8, the sealing tube 8 is fixed on the central shock absorbing structure, the central shock absorbing structure is fixedly connected to the central column 14 through four sets of connecting rods 13, the central column 14 is slidably connected to the mechanical sealing structure, the gear 2 7 is threadedly connected to the threaded rod 15, the threaded rod 15 slides in the sealing tube 8, the two ends of the sealing tube 8 and the threaded rod 15 are provided with fillers at the sliding connection, and the ends of the threaded rod 15 are fixedly connected to the mechanical sealing structure;

[0044] The working principle of the above technical solution is: turn the hand wheel 4, the hand wheel 4 rotates at the end of the connecting pipe 2, drives the rotating rod 5 to rotate, drives the gear 1 6 to rotate, drives the gear 2 7 to rotate, drives the threaded rod 15 to move inward in the sealing tube 8, drives the mechanical sealing structure to move, and the mechanical sealing structure seals the steel pipe end joint 1. At the same time, the hand wheel 4 rotates to drive the pneumatic sealing structure to further seal the steel pipe end joint 1, so that the sealing performance is stronger. Fillers are provided at the sliding connection between the two ends of the sealing tube 8 and the threaded rod 15 to prevent the fluid from overflowing at the connection between the two when the sealing tube 8 and the threaded rod 15 slide.

[0045] When the hand wheel 4 is rotated and adjusted, the notch on the side of the gear 1 6 faces the gear 2 7, so that the gear 1 6 and the gear 2 7 remain separated, preventing the meshing structure of the gear 1 6 and the gear 2 7 from hindering the movement of the gear 2 7, the sealing tube 8 and the shock absorbing ring 1 9 when the central shock absorbing structure plays a shock absorbing role, thereby affecting the shock absorbing effect.

[0046] Embodiment 3

[0047] like Figure 1-12As shown, the central shock-absorbing structure includes a shock-absorbing ring 9, which is fixedly connected to the sealing tube 8, and is slidably connected to the support ring seat 10, which is fixed in the connecting tube 2, and a plurality of shock-absorbing springs 11 are evenly distributed between the shock-absorbing ring 9 and the support ring seat 10, and a sealing layer 12 is provided at the connection between the shock-absorbing ring 9 and the support ring seat 10, and the shock-absorbing ring 9 is fixedly connected to the central column 14 through four groups of connecting rods 13;

[0048] The working principle of the above technical solution is as follows: when vibration occurs, sliding occurs between the shock absorbing ring 9 and the support ring seat 10, and multiple shock absorbing springs 11 between the two play a shock absorbing role. One end of the sealing layer 12 is fixed on the shock absorbing ring 9, and the other end of the sealing layer 12 is fixed on the support ring seat 10. When sliding occurs between the shock absorbing ring 9 and the support ring seat 10, the sealing layer 12 ensures the sealing between the two.

[0049] Embodiment 4

[0050] like Figure 1-12 As shown, the mechanical seal structure includes a sliding tube 16, which is fixedly connected to the end of the threaded rod 15, and the sliding tube 16 is slidably connected to the outside of the center column 14. The end of the center column 14 is fixedly connected to the lower ends of four support rods 17, and the upper ends of the four support rods 17 are respectively rotatably connected to the ends of four straight rods 18. The four straight rods 18 are respectively fixedly connected to the four side rods 19, and the front ends of the four side rods 19 are respectively rotatably connected to the four inner pressure plates 20. The steel pipe end joint 1 is plugged into the sealing ring 27, and the four inner pressure plates 20 squeeze the horizontal edge of the sealing ring 27 tightly against the inner side of the steel pipe end joint 1;

[0051] The straight rod 18 is slidably connected with a slider 22, the slider 22 is rotatably connected to one end of the second connecting rod 21, the other end of the second connecting rod 21 is rotatably connected to the slide tube 16, the slider 22 is rotatably connected to one end of the third connecting rod 23, the other end of the third connecting rod 23 is hingedly connected to one end of the fourth connecting rod 25, the middle part of the fourth connecting rod 25 is rotatably connected to the end of the straight rod 18, the other end of the fourth connecting rod 25 is rotatably connected to the side pressure plate 26, a spring 24 is provided between the slider 22 and the end of the straight rod 18, and the four side pressure plates 26 squeeze the vertical edge of the sealing ring 27 tightly against the edge of the steel pipe end joint 1 and the side wall of the edge shock-absorbing structure;

[0052] The working principle of the above technical solution is as follows: insert the end of the steel pipe end joint 1 into the connecting pipe 2, insert the end of the steel pipe end joint 1 between the shock-absorbing ring 28 and the sealing ring 27, turn the hand wheel 4, drive the rotating rod 5 to rotate, drive the gear 1 6 to rotate, the gear 1 6 and the gear 2 7 are meshed and driven, drive the gear 2 7 to rotate, drive the threaded rod 15 to move inward in the sealing tube 8, the end of the threaded rod 15 pulls the sliding tube 16 to slide on the central column 14, the sliding tube 16 drives the lower ends of the four connecting rods 21 to move with the sliding tube 16, drives the upper ends of the four connecting rods 21 to support the four straight rods 18 and the support rod 1 17 to rotate respectively, drives the four side rods 19 to move outward, drives the four inner pressure plates 20 to move outward, and the four inner pressure plates 20 squeeze the horizontal edges of the sealing ring 27 tightly against the inner side of the steel pipe end joint 1;

[0053] The slide tube 16 continues to slide on the center column 14, and the front end of the second connecting rod 21 pushes the slide block 22 to slide on the straight rod 18, driving the second spring 24 to be compressed, and at the same time driving the third connecting rod 23 to rotate, driving the fourth connecting rod 25 to rotate with the end of the straight rod 18 as the fulcrum, and the front end of the fourth connecting rod 25 drives the side pressure plate 26 to squeeze the vertical edge of the sealing ring 27 tightly against the edge of the port of the steel pipe end joint 1 and the side wall of the second shock-absorbing ring 28;

[0054] The cross section of the sealing ring 27 is L-shaped, including a horizontal edge and a vertical edge. The mechanical sealing structure can squeeze both the horizontal edge and the vertical edge tightly against the end of the steel pipe end joint 1, so that the sealing performance is greatly improved.

[0055] Embodiment 5

[0056] like Figure 1-12 As shown, the edge damping structure includes a damping ring 28, which is slidably connected to a support ring seat 29, which is fixed on the inner wall of the connecting pipe 2, and a plurality of damping springs 30 are evenly distributed between the damping ring 28 and the support ring seat 29. A sealing layer 21 is provided at the sliding connection between the damping ring 28 and the support ring seat 29. Four side pressure plates 26 squeeze the vertical edge of the sealing ring 27 tightly against the edge of the port of the steel pipe end joint 1 and the side wall of the damping ring 28, and the outer wall of the steel pipe end joint 1 fits with the damping ring 28.

[0057] The working principle of the above technical solution is: when vibration or shaking occurs between the steel pipe end joint 1 and the connecting pipe 2, sliding occurs between the shock absorbing ring 9 and the supporting ring seat 10 at the center of the connecting pipe 2, and multiple shock absorbing springs 11 between the two play a role in shock absorption. One end of the sealing layer 12 is fixed on the shock absorbing ring 9, and the other end of the sealing layer 12 is fixed on the supporting ring seat 10. When sliding occurs between the shock absorbing ring 9 and the supporting ring seat 10, the sealing layer 12 ensures the sealing between the two.

[0058] At the edge of the connecting pipe 2, a sliding occurs between the shock absorbing ring 28 and the supporting ring seat 29, and a plurality of shock absorbing springs 30 between the two play a role in shock absorption. One end of the sealing layer 31 is fixed to the shock absorbing ring 28, and the other end of the sealing layer 31 is fixed to the supporting ring seat 29. When sliding occurs between the shock absorbing ring 28 and the supporting ring seat 29, the sealing layer 31 ensures the sealing between the two.

[0059] The shock absorbing spring 11 and the shock absorbing spring 30 are provided to achieve shock absorption, and the sealing layer 12 and the sealing layer 2 31 ensure sealing during vibration to prevent fluid from overflowing.

[0060] Embodiment 6

[0061] like Figure 1-12 As shown, the pneumatic sealing structure includes a gas sealing seat 36, which is fixed in the connecting pipe 2, and a groove is provided on the gas sealing seat 36, and a gas sealing ring 37 is fixed in the groove. A gas storage chamber 38 is provided in the gas sealing seat 36, and the gas sealing ring 37 is connected with the gas storage chamber 38 through a connecting pipe 39. After the gas sealing ring 37 is inflated, it is tightly attached to the outer wall of the steel pipe end joint 1;

[0062] A piston 42 is slidably connected in the air storage chamber 38, and a sealing gasket 43 is provided at the end of the piston 42. The piston 42 is connected to one end of the support rod 3 40 through a connecting bent rod 41, and the other end of the support rod 3 40 is fixedly connected to the hand wheel 4;

[0063] The working principle of the above technical solution is as follows: insert the end of the steel pipe end joint 1 into the connecting pipe 2, insert the end of the steel pipe end joint 1 between the shock absorbing ring 28 and the sealing ring 27, turn the hand wheel 4, drive the support rod 3 40 to move, drive the connecting bent rod 41 to move, drive the piston 42 to slide in the gas storage chamber 38, the piston 42 squeezes the gas in the gas storage chamber 38 into the gas sealing ring 37 through the connecting pipe 39, after the gas is rushed into the gas sealing ring 37, the gas sealing ring 37 continues to expand, and the inner side of the gas sealing ring 37 is tightly attached to the On the wall of the steel pipe end joint 1, the outer side of the air-sealing ring 37 is tightly attached to the groove of the air-sealing seat 36, thereby completing the seal between the steel pipe end joint 1 and the connecting pipe 2. Since the air-sealing ring 37 has a certain elasticity after being inflated, in the event of a slight offset between the steel pipe end joint 1 and the connecting pipe 2, the inner and outer ends of the air-sealing ring 37 can also be tightly attached to the air-sealing seat 36 and the connecting pipe 2, further preventing the fluid from overflowing, and preventing external dust from entering and polluting the edge shock-absorbing structure and the mechanical sealing structure.

[0064] Embodiment 7

[0065] like Figure 1-12As shown, the side of the airtight sealing seat 36 is provided with a non-return structure, which includes a second support rod 33, the second support rod 33 is fixed to the side of the airtight sealing seat 36, a pawl 34 is rotatably connected to the second support rod 33, a torsion spring 35 is provided between the second support rod 33 and the pawl 34, and the front end of the pawl 34 is clamped on the helical tooth 32 provided in the hand wheel 4;

[0066] The working principle of the above technical solution is as follows: when the hand wheel 4 is turned, the front end of the ratchet 34 is clamped in the helical tooth 32 to prevent the hand wheel 4 from automatically reversing, so that the mechanical sealing structure and the pneumatic sealing structure are fully clamped on the steel pipe end joint 1 to maintain good sealing performance;

[0067] When it is necessary to separate the steel pipe end joint 1 from the connecting pipe 2, the ratchet 34 is toggled, the ratchet 34 and the supporting rod 2 33 rotate, driving the torsion spring 35 to deform, so that the front end of the ratchet 34 is separated from the bevel tooth 32, and the hand wheel 4 is rotated in the opposite direction, driving the rotating rod 5 to rotate in the opposite direction, driving the gear 1 6 to rotate in the opposite direction, and the gear 2 7 to rotate in the opposite direction, driving the threaded rod 15 to move in the opposite direction, driving the sliding tube 16 to slide in the opposite direction on the center column 14, driving the connecting rod 21 to move backward, driving the front end of the straight rod 18 to rotate downward, driving the side rod 19 to move downward, driving the inner pressure plate 20 to separate from the sealing ring 27, and while the connecting rod 21 moves backward, the slider 22 slides backward on the straight rod 18, driving the spring 24 to pull apart, driving the connecting rod 3 23 and the connecting rod 4 25 to rotate, driving the side pressure plate 26 to separate from the sealing ring 27, and the steel pipe end joint 1 loses the effect of the sealing ring 27 squeezing and pressing it;

[0068] At the same time, the hand wheel 4 rotates in the opposite direction, driving the support rod 3 40 and the connecting bent rod 41 to rotate in the opposite direction, driving the piston 42 to slide in the air storage chamber 38, the space in the air storage chamber 38 increases, the gas in the air sealing ring 37 enters the air storage chamber 38, the air sealing ring 37 shrank, the inner side of the air sealing ring 37 is separated from the outer side of the steel pipe end joint 1, and the steel pipe end joint 1 loses the squeezing and pressing effect of the air sealing ring 37 on it; then the steel pipe end joint 1 can be pulled out, which is convenient for replacement or maintenance;

[0069] The connection method of the plastic pipe end joint 3 and the connecting pipe 2 is the same as the connection method of the steel pipe end joint 1 and the connecting pipe 2.

[0070] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A curved pipe type steel-plastic conversion pipe fitting joint assembly, characterized in that: The invention comprises a steel pipe end joint (1), a connecting pipe (2) and a plastic pipe end joint (3); the steel pipe end joint (1) and the plastic pipe end joint (3) are respectively inserted into mechanical sealing structures at both ends of the connecting pipe (2); the mechanical sealing structure is fixedly connected to a driving structure arranged on the outside of the connecting pipe (2); an edge damping structure is arranged between the inner wall of the connecting pipe (2) and the mechanical sealing structure; and a pneumatic sealing structure is arranged between the steel pipe end joint (1) and the connecting pipe (2).

2. The elbow type steel-plastic conversion pipe fitting joint assembly according to claim 1, characterized in that: The driving structure comprises a hand wheel (4), the hand wheel (4) is rotatably connected to the end of the connecting tube (2), the hand wheel (4) is meshed with a gear at one end of a rotating rod (5) for transmission, the middle part of the rotating rod (5) is rotatably connected to the outside of the connecting tube (2), the other end of the rotating rod (5) is fixed with a gear one (6), and a notch is provided on the side of the gear one (6).

3. The elbow type steel-plastic conversion pipe fitting joint assembly according to claim 2, characterized in that: The gear 1 (6) and the gear 2 (7) are meshed for transmission, the gear 2 (7) rotates in the sealing tube (8), the sealing tube (8) is fixed on the central shock absorbing structure, the central shock absorbing structure is fixedly connected to the central column (14) through four groups of connecting rods 1 (13), the central column (14) is slidably connected to the mechanical sealing structure, the gear 2 (7) is threadedly connected to the threaded rod (15), the threaded rod (15) slides in the sealing tube (8), fillers are provided at the sliding connection between the two ends of the sealing tube (8) and the threaded rod (15), and the ends of the threaded rod (15) are fixedly connected to the mechanical sealing structure.

4. The elbow type steel-plastic conversion pipe fitting joint assembly according to claim 3 is characterized in that: The central shock-absorbing structure comprises a shock-absorbing ring (9), the shock-absorbing ring (9) is fixedly connected to the sealing tube (8), the shock-absorbing ring (9) is slidably connected to the support ring seat (10), the support ring seat (10) is fixed in the connecting tube (2), a plurality of shock-absorbing springs (11) are evenly distributed between the shock-absorbing ring (9) and the support ring seat (10), a sealing layer (12) is provided at the connection between the shock-absorbing ring (9) and the support ring seat (10), and the shock-absorbing ring (9) is fixedly connected to the central column (14) through four groups of connecting rods (13).

5. The elbow type steel-plastic conversion pipe fitting joint assembly according to claim 4, characterized in that: The mechanical sealing structure comprises a sliding tube (16), the sliding tube (16) is fixedly connected to the end of the threaded rod (15), the sliding tube (16) is slidably connected to the outside of the central column (14), the end of the central column (14) is fixedly connected to the lower end of four support rods (17), the upper ends of the four support rods (17) are respectively rotatably connected to the ends of four straight rods (18), the four straight rods (18) are respectively fixedly connected to four side rods (19), the front ends of the four side rods (19) are respectively rotatably connected to four inner pressure plates (20), the steel pipe end joint (1) is plugged into the sealing ring (27), and the four inner pressure plates (20) squeeze the horizontal edge of the sealing ring (27) tightly against the inner side of the steel pipe end joint (1).

6. The elbow type steel-plastic conversion pipe fitting joint assembly according to claim 5, characterized in that: The straight rod (18) is slidably connected with a slider (22), the slider (22) is rotatably connected to one end of the second connecting rod (21), the other end of the second connecting rod (21) is rotatably connected to the sliding tube (16), the slider (22) is rotatably connected to one end of the third connecting rod (23), the other end of the third connecting rod (23) is hingedly connected to one end of the fourth connecting rod (25), the middle part of the fourth connecting rod (25) is rotatably connected to the end of the straight rod (18), the other end of the fourth connecting rod (25) is rotatably connected to the side pressure plate (26), a spring two (24) is provided between the slider (22) and the end of the straight rod (18), and the four side pressure plates (26) squeeze the vertical edge of the sealing ring (27) tightly against the edge of the steel pipe end joint (1) and the side wall of the edge shock-absorbing structure.

7. The elbow type steel-plastic conversion pipe fitting joint assembly according to claim 6, characterized in that: The edge shock-absorbing structure comprises a second shock-absorbing ring (28), which is slidably connected to a second support ring seat (29), which is fixed on the inner wall of the connecting pipe (2), and a plurality of third shock-absorbing springs (30) are evenly distributed between the second shock-absorbing ring (28) and the second support ring seat (29). A second sealing layer (31) is provided at the sliding connection between the second shock-absorbing ring (28) and the second support ring seat (29), and four side pressure plates (26) squeeze the vertical edge of the sealing ring (27) tightly against the edge of the port of the steel pipe end joint (1) and the side wall of the second shock-absorbing ring (28), so that the outer wall of the steel pipe end joint (1) fits the second shock-absorbing ring (28).

8. The elbow type steel-plastic conversion pipe fitting joint assembly according to claim 7, characterized in that: The pneumatic sealing structure comprises an air sealing seat (36), the air sealing seat (36) is fixed in the connecting pipe (2), a groove is provided on the air sealing seat (36), an air sealing ring (37) is fixed in the groove, an air storage chamber (38) is provided in the air sealing seat (36), the air sealing ring (37) is connected to the air storage chamber (38) through a connecting pipe (39), and the air sealing ring (37) is tightly attached to the outer wall of the steel pipe end joint (1) after being inflated.

9. The elbow type steel-plastic conversion pipe fitting joint assembly according to claim 8, characterized in that: A piston (42) is slidably connected in the air storage chamber (38), a sealing gasket (43) is provided at the end of the piston (42), the piston (42) is connected to one end of the support rod three (40) through a connecting bent rod (41), and the other end of the support rod three (40) is fixedly connected to the hand wheel (4).

10. The elbow type steel-plastic conversion pipe fitting joint assembly according to claim 9, characterized in that: A non-return structure is provided on the side of the air-tight sealing seat (36), and the non-return structure includes a second support rod (33), the second support rod (33) is fixed on the side of the air-tight sealing seat (36), a ratchet (34) is rotatably connected to the second support rod (33), a torsion spring (35) is provided between the second support rod (33) and the ratchet (34), and the front end of the ratchet (34) is clamped on the bevel tooth (32) provided in the hand wheel (4).

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