Multi-section type sealing structure of wedge ring compression type pipeline plugging device

Abstract

The invention discloses a multi-section type sealing structure of a wedge ring compression type pipeline plugging device. The multi-section type sealing structure comprises a pipeline, and the pipeline is fixedly installed in a through hole through a wedge ring plugging mechanism; the at least two wedge ring plugging mechanisms are mounted on the pipeline at intervals; and the center fixing mechanism is fixedly installed outside the pipeline and used for fixedly connecting the pipeline with the inner wall of the through hole, and the center fixing mechanism is located between the two wedge ring plugging mechanisms. The sealing device has the axial and radial tensioning functions, meanwhile, the elastic tensioning mechanism is arranged to maintain the dynamic sealing effect, so that the sealing reliability and durability are remarkably improved, the sealing device can provide reliable sealing during primary use, the sealing state can be dynamically adjusted in the use process, and the sealing service life is prolonged.

Description

Technical Field

[0001] The invention relates to the field of pipeline plugging, and in particular to a multi-section sealing structure of a wedge ring compression type pipeline plugging device. Background Art

[0002] Pipeline plugging technology is widely used in various industrial fields, especially in pipeline maintenance, inspection and fluid transportation systems. Its main function is to use the plugging device to temporarily or permanently seal the pipeline without dismantling the pipeline to prevent internal medium leakage and ensure the stable operation of the system. This technology is particularly important in the oil, natural gas, chemical, water supply and other industries, because once the pipeline leaks, it may have a serious impact on production safety, environmental protection and economic benefits. Therefore, reliable pipeline plugging technology has become a key link in pipeline management in various industries.

[0003] The traditional wedge ring plugging mechanism is one of the common plugging devices, which mainly relies on the axial compression of a single wedge ring to achieve pipeline sealing. Its basic principle is to use the radial expansion and compression effect of the wedge ring to tightly squeeze the plugging material between the pipe wall and the plugging device to achieve a sealing effect. However, the traditional wedge ring plugging mechanism generally has the following problems:

[0004] The sealing material of the wedge ring sealing mechanism is usually elastic materials such as rubber, but these materials are prone to aging after long-term use, resulting in weakened elasticity and reduced sealing performance. The aging effect gradually accumulates during the use of the pipeline, which may eventually lead to sealing failure and medium leakage;

[0005] The traditional wedge ring plugging mechanism can achieve a good sealing effect when it is first installed, but as time goes by, the sealing performance will gradually decrease, and it is difficult to dynamically adjust or compensate in the later stage. Especially when the pipeline is hidden, it is very difficult to re-seal the pipe, which increases the difficulty of maintenance and repair.

[0006] Traditional wedge ring sealing mechanisms usually only have the ability to lock and tighten in the axial direction, but lack radial support and tightening effects, which leads to the sealing structure being prone to poor sealing under complex stress conditions, affecting the long-term stability of the seal.

[0007] After the sealing performance gradually deteriorates, the traditional wedge ring sealing mechanism often cannot provide effective secondary sealing, thereby exacerbating the risk of leakage and making it difficult to meet the application requirements of long-term sealing. Summary of the invention

[0008] In order to solve the above problems, the present invention provides a multi-stage sealing structure of a wedge ring compression pipeline sealing device, which has axial and radial tensioning functions and is equipped with an elastic tensioning mechanism to maintain a dynamic sealing effect, thereby significantly improving the reliability and durability of the seal. The sealing device of the present invention can not only provide a reliable seal during the first use, but also dynamically adjust the sealing state during use, thereby extending the sealing life and adapting to complex industrial application environments.

[0009] The present invention is realized by the following technical scheme: a multi-stage sealing structure of a wedge ring compression type pipeline plugging device, comprising:

[0010] A pipeline, wherein the pipeline is fixedly installed in the perforation through a wedge ring sealing mechanism;

[0011] At least two wedge ring plugging mechanisms are installed on the pipeline at intervals;

[0012] A central fixing mechanism, fixedly mounted on the outside of the pipeline, used to fixedly connect the pipeline to the inner wall of the perforation, and the central fixing mechanism is located between the two wedge ring sealing mechanisms;

[0013] An elastic tensioning mechanism is provided between the central fixing mechanism and each wedge ring sealing mechanism, and each wedge ring sealing mechanism is kept in an elastic tensioning state between the pipeline and the perforation by means of the elastic tensioning mechanism.

[0014] As a preferred technical solution, the wedge ring sealing mechanism includes:

[0015] A first wedge ring and a second wedge ring;

[0016] An inner wedge ring and an outer wedge ring, the inner wedge ring is installed in the outer wedge ring, a first annular extrusion surface is provided on both sides of the outer wedge ring, a second annular extrusion surface is provided on both sides of the inner wedge ring, the first wedge ring and the second wedge ring are installed on both sides of the inner wedge ring and the outer wedge ring, a third annular extrusion surface is provided at the position of the first wedge ring and the second wedge ring corresponding to the first annular extrusion surface, and a fourth annular extrusion surface is provided at the position of the first wedge ring and the second wedge ring corresponding to the second annular extrusion surface;

[0017] A locking mechanism is installed on the outer sides of the first wedge ring and the second wedge ring. The locking mechanism passes through the first wedge ring and the second wedge ring, and the first wedge ring, the second wedge ring, the inner wedge ring and the outer wedge ring are pressed together by the locking mechanism, so that the inner wedge ring and the outer wedge ring are tightened between the through hole and the pipeline.

[0018] A gap cavity is formed between the inner wedge ring and the outer wedge ring. The elastic tensioning mechanism includes a tensioning ring and an elastic tensioning mechanism. The tensioning ring is installed in the gap cavity. The elastic tensioning mechanism is used to pull the wedge ring sealing mechanism toward the central fixing mechanism. The locking mechanism passes through the tensioning ring.

[0019] As a preferred technical solution, the tension ring is annular, the outer circumferential surface of the tension ring is provided with a first inflatable extrusion ring, the inner circumferential surface of the tension ring is provided with a second inflatable extrusion ring, the inner circumferential surface of the outer wedge ring is provided with a first annular cavity, the outer circumferential surface of the inner wedge ring is provided with a second annular cavity, the first inflatable extrusion ring is buckled into the first annular cavity, and the second inflatable extrusion ring is buckled into the second annular cavity;

[0020] The locking mechanism includes a locking rod and two end plates, the two end plates are located at the outer ends of the first wedge ring and the second wedge ring, the locking rod passes through the end plate, the first wedge ring, the tensioning ring, and the second wedge ring in sequence, and a sealed cavity is formed in the middle of the locking rod. The locking rod is located at an opening at one end of the elastic tensioning mechanism;

[0021] An air guide tube is provided at the position of each locking rod corresponding to the first inflatable extrusion ring and the second inflatable extrusion ring, and the sealing cavity is connected to the first inflatable extrusion ring and the second inflatable extrusion ring through the air guide tube.

[0022] As a preferred technical solution, the elastic tensioning mechanism includes a driving rod, a spring and a sealing plug. One end of the driving rod is fixed on the central fixing mechanism, and the other end extends into the sealing cavity inside the locking rod. The sealing plug is installed on the driving rod, and the sealing plug seals the opening end of the sealing cavity. The spring is sleeved on the outside of the driving rod, and one end of the spring is fixedly connected to the end plate, and the other end is fixedly connected to the central fixing mechanism. When the entire wedge ring sealing mechanism moves toward the central fixing mechanism, the gas in the sealing cavity is squeezed out through the air guide tube into the inflation extrusion ring.

[0023] As a preferred technical solution, a limit nut is provided at one end of the locking rod, and an external thread section is provided at the other end of the locking rod. A locking nut is installed on the external thread section. The two end plates are locked by the locking nut and the first wedge ring and the second wedge ring are squeezed by the two end plates.

[0024] As a preferred technical solution, a conical hole is provided on the first wedge ring and the second wedge ring at the position corresponding to each locking rod, and a conical wedge block is provided in each conical hole. The conical wedge block is inserted into the conical hole and one end protrudes from the outside of the first wedge ring and the second wedge ring, and the protruding end is in contact with the end plate, and the locking rods are all set through the conical wedge blocks.

[0025] As a preferred technical solution, the outer circumferential surface of the outer wedge ring is provided with at least one first dividing groove, a first dividing ring is arranged in the first dividing groove, the first dividing ring is slightly convex from the outer circumferential surface of the outer wedge ring, and the first dividing ring is in contact and pressed against the inner wall surface of the perforation;

[0026] At least one second dividing groove is arranged on the inner ring surface of the inner wedge ring, a second dividing ring is arranged in the second dividing groove, the second dividing ring is slightly convex from the inner circular surface of the inner wedge ring, and the second dividing ring is in contact and pressed against the outer wall surface of the pipeline.

[0027] As a preferred technical solution, first extension rings are provided at the positions where the end surfaces on both sides of the outer wedge ring are connected with the outer circumferential surface of the outer wedge ring, and the first extension rings extend toward the outer circumferential surfaces of the first wedge ring and the second wedge ring respectively;

[0028] A second extension ring is provided at the position where the end surfaces on both sides of the inner wedge ring are connected with the outer circumferential surface of the inner wedge ring, and the second extension ring extends toward the inner circumferential surfaces of the first wedge ring and the second wedge ring respectively;

[0029] When the outer wedge ring and the inner wedge ring are subjected to radial compression by the tension ring, the outer wedge ring and the inner wedge ring respectively use the first dividing groove and the second dividing groove as center points, and the extension rings on both sides shrink inward toward the first wedge ring and the second wedge ring respectively, and the first extension ring and the second extension ring are used to seal the two ends of the first wedge ring and the second wedge ring.

[0030] As a preferred technical solution, sealing buckle grooves are provided on the outer circumferential surfaces of the first wedge ring and the second wedge ring at positions corresponding to the first extension ring and the second extension ring. The inner shrinkage of the first extension ring and the second extension ring is buckled into the sealing buckle grooves, and the cross-sections of the first dividing groove and the second dividing groove are "V"-shaped.

[0031] As a preferred technical solution, the central fixing mechanism includes a fixed plate, the inner circular surface of the fixed plate is fixedly bonded to the outer circular surface of the pipeline, the outer circular surface of the fixed plate is fixedly bonded to the inner wall surface of the perforation, and fixed rods are fixedly arranged on both sides of the fixed plate corresponding to each driving rod, and one end of the driving rod is fixedly installed on the end face of the fixed rod.

[0032] The beneficial effects of the present invention are as follows: the present invention increases the risk after pipeline plugging through the design of a multi-stage sealing structure, reduces the safety use problems caused by leakage of a single-stage wedge ring plugging mechanism, and improves the stability of pipeline plugging;

[0033] The present invention can realize the bidirectional tightening capability of the wedge ring sealing mechanism in the axial direction and the radial direction, thereby enhancing the overall sealing performance of the device. When the sealing performance of the wedge ring sealing mechanism deteriorates, the tightening ring can be used to dynamically adjust the sealing state, thereby ensuring that the wedge ring sealing mechanism can still maintain reliable sealing performance even in the case of long-term use or material aging, thereby extending the service life of the device.

[0034] In addition, the present invention has a reasonable structural design, can provide a higher sealing effect in the initial stage of plugging, and has a dynamic adjustment function, which reduces the need for later maintenance. It is particularly suitable for pipeline plugging environments that are hidden and difficult to frequently inspect. Compared with the traditional single axial tension plugging device, the present invention also adds a radial tensioning effect, further improving the sealing effect of the device under complex stress conditions, and avoiding the problem of reduced sealing performance that is easy to occur in traditional plugging devices in an environment with uneven stress.

[0035] In addition, the present invention provides a first dividing groove and a second dividing groove on the outer wedge ring and the inner wedge ring. When the tensioning ring generates radial pressure, the extension rings on both sides shrink inward toward the first wedge ring and the second wedge ring respectively with the first dividing groove and the second dividing groove as the center points. The first extension ring and the second extension ring are used to seal the two ends of the first wedge ring and the second wedge ring, thereby achieving secondary sealing capability and further improving the sealing performance of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 This is a schematic diagram of the internal structure of the present invention after the perforation is removed;

[0039] Figure 3 A schematic diagram of the explosion structure of one of the wedge ring sealing mechanisms of the present invention;

[0040] Figure 4 It is a structural schematic diagram of the inner wedge ring of the present invention;

[0041] Figure 5 It is a structural schematic diagram of the tensioning ring of the present invention;

[0042] Figure 6 It is a cross-sectional schematic diagram of the present invention;

[0043] Figure 7 For the present invention Figure 6 A partial enlarged view of the middle A;

[0044] Figure 8 It is a schematic diagram of a three-dimensional cross-sectional structure of the present invention;

[0045] Description of reference numerals:

[0046] 1. Perforation; 2. Pipeline; 6. First wedge ring; 9. Second wedge ring; 17. Inner wedge ring; 8. Outer wedge ring; 82. First annular extrusion surface; 21. Second annular extrusion surface; 13. Third annular extrusion surface; 101. Fourth annular extrusion surface; 14. Tension ring; 16. First inflatable extrusion ring; 15. Second inflatable extrusion ring; 83. First annular cavity; 18. Second annular cavity; 4. Locking rod; 3. End plate; 31. Shaft hole; 41. Sealing cavity; 12. Drive rod; 100. Spring; 22. Sealing plug; 42. Limiting nut; 5. Locking nut; 24. Conical wedge block; 7. First dividing ring; 23. Second dividing groove; 20. Second dividing ring; 81. First extension ring; 19. Second extension ring; 11. Fixed plate; 10. Fixed rod. DETAILED DESCRIPTION

[0047] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0048] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0049] like Figure 1 and Figure 2 As shown, a multi-stage sealing structure of a wedge ring compression type pipeline plugging device of the present invention comprises a pipeline 2, wherein the pipeline 2 is fixedly installed in a perforation 1 through a wedge ring plugging mechanism;

[0050] At least two wedge ring plugging mechanisms are installed on the pipeline 2 at intervals. In this embodiment, the wedge ring plugging mechanism is set to two sections, acting on the pipeline 2 to achieve two-section sealing. When one of the wedge ring plugging mechanisms has a sealing problem, the other wedge ring plugging mechanism can be used to achieve sealing and plugging;

[0051] It also includes a central fixing mechanism, which is fixedly installed on the outside of the pipeline 2 and is used to fix the pipeline 2 to the inner wall of the perforation 1. The central fixing mechanism is located between the two wedge ring plugging mechanisms. The central fixing mechanism is used to be fixed in the pipeline 2. It cannot be displaced in the axial position, so as to serve as the central positioning point of the two wedge ring plugging mechanisms.

[0052] Among them, an elastic tensioning mechanism is arranged between the central fixing mechanism and each wedge ring sealing mechanism, and each wedge ring sealing mechanism is kept in an elastic tensioning state between the pipeline 2 and the perforation 1 through the elastic tensioning mechanism. When there is a problem with the sealing performance of the two wedge ring sealing mechanisms, the elastic tensioning mechanism is used to radially tighten each wedge ring sealing mechanism, so that the entire wedge ring sealing mechanism maintains a floating sealing adjustment state during use, so that the entire wedge ring sealing mechanism is in a better sealing state.

[0053] like Figure 3 and Figure 4 As shown, the wedge ring sealing mechanism includes:

[0054] A first wedge ring 6 and a second wedge ring 9;

[0055] It also includes an inner wedge ring 17 and an outer wedge ring 8, wherein the inner wedge ring 17 is installed in the outer wedge ring 8, and the outer wedge ring 8 is provided with a first annular extrusion surface 82 on both sides, and the inner wedge ring 17 is provided with a second annular extrusion surface 21 on both sides, and the first wedge ring 6 and the second wedge ring 9 are installed on both sides of the inner wedge ring 17 and the outer wedge ring 8, and the first wedge ring 6 and the second wedge ring 9 are provided with a third annular extrusion surface 13 at the position corresponding to the first annular extrusion surface 82, and the first wedge ring 6 and the second wedge ring 9 are provided with a fourth annular extrusion surface 101 at the position corresponding to the second annular extrusion surface 21. Through the provision of the annular extrusion surface, when the first wedge ring 6 and the second wedge ring 9 are clamped toward the inner wedge ring 17 and the outer wedge ring 8, the extrusion is completed by the inclined extrusion surface, thereby realizing the tightening action of the inner wedge ring 17 and the outer wedge ring 8, so that it can achieve a radial tightening through axial locking;

[0056] It also includes a locking mechanism, which is installed on the outside of the first wedge ring 6 and the second wedge ring 9. The locking mechanism passes through the first wedge ring 6 and the second wedge ring 9, and the first wedge ring 6, the second wedge ring 9, the inner wedge ring 17, and the outer wedge ring 8 are pressed by the locking mechanism, and the inner wedge ring 17 and the outer wedge ring 8 are tightened between the through hole 1 and the pipeline 2. The inner wedge ring 17 and the outer wedge ring 8 are locked in the axial direction by the locking mechanism to complete the tightening action;

[0057] like Figure 6-Figure 8As shown, a gap cavity is formed between the inner wedge ring 17 and the outer wedge ring 8, and the elastic tensioning mechanism includes a tensioning ring 14 and an elastic tensioning mechanism. The tensioning ring 14 is installed in the gap cavity, and the elastic tensioning mechanism is used to pull the wedge ring sealing mechanism toward the central fixing mechanism. The locking mechanism passes through the tensioning ring 14, and the tensioning ring 14 is used to apply radial tensioning force to the inner wedge ring 17 and the outer wedge ring 8, so that the inner wedge ring 17 and the outer wedge ring 8 can be floatingly tensioned during use. When the sealing performance of the outer wedge ring 8 and the inner wedge ring 17 deteriorates, radial tension can be achieved by the radial tensioning force of the tensioning ring 14 to prevent the sealing performance from deteriorating too quickly.

[0058] Among them, the tension ring 14 is annular, the outer circumferential surface of the tension ring 14 is provided with a first inflatable extrusion ring 16, the inner circumferential surface of the tension ring 14 is provided with a second inflatable extrusion ring 15, the inner circumferential surface of the outer wedge ring 8 is provided with a first annular cavity 83, the outer circumferential surface of the inner wedge ring 17 is provided with a second annular cavity 18, the first inflatable extrusion ring 16 is buckled into the first annular cavity 83, the second inflatable extrusion ring 15 is buckled into the second annular cavity 18, the first inflatable extrusion ring 16 and the second inflatable extrusion ring 15 can be kept in an expanded state by inflation, when one of the wedge ring plugging machines When the sealing performance of the wedge ring plugging mechanism deteriorates and the mechanism is axially displaced between the pipeline 2 and the through hole, the first inflatable extrusion ring 16 and the second inflatable extrusion ring 15 can be driven to expand radially through the elastic tensioning mechanism, thereby applying radial tensioning force to the inner wedge ring 17 and the outer wedge ring 8 to achieve the purpose of radial tensioning. The purpose of radial tensioning is achieved by using the inner wedge ring 17 and the outer wedge ring 8 that have expanded again. Therefore, as long as the sealing performance of the wedge ring plugging mechanism deteriorates and the mechanism is axially displaced toward the central fixing mechanism, the deterioration of the sealing performance of the inner wedge ring 17 and the outer wedge ring 8 can be compensated by adding more gas to the inflatable extrusion ring.

[0059] like Figure 1 , Figure 5 and Figure 6 As shown, the locking mechanism includes a locking rod 4 and two end plates 3, the two end plates 3 are located at the outer ends of the first wedge ring 6 and the second wedge ring 9, the locking rod 4 passes through the end plate 3, the first wedge ring 6, the tensioning ring 14, and the second wedge ring 9 in sequence, and a sealed cavity 41 is formed in the middle of the locking rod 4. The locking rod 4 is located at an opening at one end of the elastic tensioning mechanism, and the hollow locking rod 4 structure is used to continuously replenish gas into the inflatable extrusion ring to achieve expansion, thereby tightening the inner wedge ring 17 and the outer wedge ring 8, and an axial hole 31 is provided on the end plate 3 for the locking rod 4 to pass through;

[0060] An air duct is provided at the position of each locking rod 4 corresponding to the first inflatable extrusion ring 16 and the second inflatable extrusion ring 15, through which the sealing cavity 41 is connected to the first inflatable extrusion ring 16 and the second inflatable extrusion ring 15. The hollow locking rod 4 is connected to the inflatable extrusion ring, so the displaced wedge ring sealing mechanism can squeeze the gas in the sealing cavity 41 into the inflatable extrusion ring.

[0061] Among them, Figure 6 As shown, the elastic tensioning mechanism includes a driving rod 12, a spring 100 and a sealing plug 22, one end of the driving rod 12 is fixed on the central fixing mechanism, and the other end extends into the sealing cavity 41 inside the locking rod 4, the sealing plug 22 is installed on the driving rod 12, and the sealing plug 22 seals the opening end of the sealing cavity 41, the spring 100 is sleeved on the outside of the driving rod 12, and one end of the spring 100 is fixedly connected to the end plate 3, and the other end is fixedly connected to the central fixing mechanism. When the entire wedge ring sealing mechanism moves toward the central fixing mechanism, the gas in the sealing cavity 41 is squeezed into the inflation extrusion ring through the air guide tube, and the elastic force of the spring 100 is set as large as possible, so that there can be a larger pulling force, so that when the wedge ring sealing mechanism is displaced, the driving rod 12 can squeeze more gas into the inflation extrusion ring. When the sealing performance of the two wedge ring sealing mechanisms is sufficient, that is, after the wedge ring sealing mechanisms are installed and their sealing performance is guaranteed, they have sufficient tensioning force to allow the wedge ring sealing mechanisms to maintain the axial position of the perforation 1 and the pipeline 2. When the elasticity deteriorates after long-term use, the wedge ring sealing mechanisms will move slightly in the axial direction, and the driving rod 12 can be used to add an appropriate amount of gas to keep the entire wedge ring sealing mechanism in a floating tensioned state.

[0062] like Figure 5 As shown, a limit nut 42 is provided at one end of the locking rod 4, and an external thread section is provided at the other end of the locking rod 4, on which a locking nut 5 is installed. The two end plates 3 are locked by the locking nut 5 and the first wedge ring 6 and the second wedge ring 9 are squeezed by the two end plates 3. When locking, the inner wedge ring 17 and the outer wedge ring 8 can be squeezed by the end plates 3 by rotating the locking nut 5.

[0063] like Figure 7 As shown, a conical hole is provided on the first wedge ring 6 and the second wedge ring 9 at a position corresponding to each locking rod 4, and a conical wedge block 24 is provided in each conical hole. The conical wedge block 24 is inserted into the conical hole and one end protrudes from the outside of the first wedge ring 6 and the second wedge ring 9, and the protruding end thereof contacts the end plate 3, and the locking rods 4 are all provided through the conical wedge block 24.

[0064] Please continue reading Figure 7The outer circumferential surface of the outer wedge ring 8 has at least one first dividing groove, which is one first dividing groove in this embodiment. A first dividing ring 7 is arranged in the first dividing groove. The first dividing ring 7 is slightly convex from the outer circumferential surface of the outer wedge ring 8. The first dividing ring 7 is in contact with and pressed against the inner wall of the through hole 1;

[0065] At least one second dividing groove 23 is arranged on the inner ring surface of the inner wedge ring 17. In the present embodiment, there is one second dividing groove 23. A second dividing circle 20 is arranged in the second dividing groove 23. The second dividing circle 20 is slightly convex from the inner circular surface of the inner wedge ring 17. The second dividing circle 20 is in contact and pressed against the outer wall surface of the pipeline 2. When the first inflatable extrusion ring 16 and the second inflatable extrusion ring 15 are inflated and extruded, the dividing groove can be used as a dividing point, so that the inner wedge ring 17 and the outer wedge ring 8 are retracted to achieve secondary sealing.

[0066] Wherein, first extension rings 81 are arranged at the positions where the end surfaces on both sides of the outer wedge ring 8 are connected with the outer circumferential surface of the outer wedge ring 8, and the first extension rings 81 extend toward the outer circumferential surfaces of the first wedge ring 6 and the second wedge ring 9 respectively;

[0067] A second extension ring 19 is provided at the position where the end surfaces on both sides of the inner wedge ring 17 are connected to the outer circumferential surface of the inner wedge ring 17, and the second extension ring 19 extends toward the inner circumferential surface of the first wedge ring 6 and the second wedge ring 9 respectively;

[0068] When the outer wedge ring 8 and the inner wedge ring 17 are subjected to radial compression by the tensioning ring 14, the outer wedge ring 8 and the inner wedge ring 17 respectively use the first dividing groove and the second dividing groove 23 as the center points, and the extension rings on both sides shrink inward toward the first wedge ring 6 and the second wedge ring 9 respectively, and the first extension ring 81 and the second extension ring 19 are used to seal the two ends of the first wedge ring 6 and the second wedge ring 9.

[0069] In order to further improve the sealing performance and realize secondary sealing, sealing buckle grooves are provided on the outer circumferential surfaces of the first wedge ring 6 and the second wedge ring 9 at positions corresponding to the first extension ring 81 and the second extension ring 19. The first extension ring 81 and the second extension ring 19 are buckled into the sealing buckle grooves, and the cross-sections of the first dividing groove and the second dividing groove 23 are "V"-shaped. Therefore, after being squeezed by the inflatable extrusion ring, the openings on both sides of the inner wedge ring 17 and the outer wedge ring 8 can be squeezed inward, thereby achieving the purpose of improving the sealing performance.

[0070] Among them, Figure 6As shown, the central fixing mechanism includes a fixing disk 11, the inner circumferential surface of the fixing disk 11 is fixedly bonded to the outer circumferential surface of the pipeline 2, and the outer circumferential surface of the fixing disk 11 is fixedly bonded to the inner wall surface of the perforation 1. A fixing rod 10 is fixedly arranged on both sides of the fixing disk 11 corresponding to each driving rod 12, and one end of the driving rod 12 is fixedly installed on the end surface of the fixing rod 10. The central fixing mechanism serves as the central positioning point of the two wedge ring sealing mechanisms. When one or both of the wedge ring sealing mechanisms have sealing problems, the wedge ring sealing mechanism is pulled under the action of the spring 100 and is moved toward the central fixing mechanism. In this process, the sealing plug 22 can be used to squeeze out the gas in the sealing cavity 41 to ensure that the inflatable extrusion ring remains in an inflated and expanded state.

[0071] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. A multi-stage sealing structure of a wedge ring compression type pipeline plugging device, characterized in that: include: A pipeline (2), wherein the pipeline (2) is fixedly installed in the perforation (1) via a wedge ring sealing mechanism; At least two wedge ring plugging mechanisms are installed on the pipeline (2) at intervals; A central fixing mechanism, fixedly mounted on the outside of the pipeline (2), used for fixedly connecting the pipeline (2) to the inner wall of the perforation (1), the central fixing mechanism being located between the two wedge ring sealing mechanisms; An elastic tensioning mechanism is provided between the central fixing mechanism and each wedge ring sealing mechanism, and each wedge ring sealing mechanism is kept in an elastic tensioning state between the pipeline (2) and the perforation (1) by means of the elastic tensioning mechanism.

2. The multi-stage sealing structure of the wedge ring compression type pipeline plugging device according to claim 1 is characterized in that: The wedge ring sealing mechanism comprises: A first wedge ring (6) and a second wedge ring (9); An inner wedge ring (17) and an outer wedge ring (8), wherein the inner wedge ring (17) is installed inside the outer wedge ring (8), first annular extrusion surfaces (82) are provided on both sides of the outer wedge ring (8), and second annular extrusion surfaces (21) are provided on both sides of the inner wedge ring (17); the first wedge ring (6) and the second wedge ring (9) are installed on both sides of the inner wedge ring (17) and the outer wedge ring (8), a third annular extrusion surface (13) is provided at a position of the first wedge ring (6) and the second wedge ring (9) corresponding to the first annular extrusion surface (82), and a fourth annular extrusion surface (101) is provided at a position of the first wedge ring (6) and the second wedge ring (9) corresponding to the second annular extrusion surface (21); A locking mechanism is installed on the outer sides of the first wedge ring (6) and the second wedge ring (9), and the locking mechanism passes through the first wedge ring (6) and the second wedge ring (9). The first wedge ring (6), the second wedge ring (9), the inner wedge ring (17), and the outer wedge ring (8) are pressed together by the locking mechanism, and the inner wedge ring (17) and the outer wedge ring (8) are tightened between the through hole (1) and the pipeline (2); A gap cavity is formed between the inner wedge ring (17) and the outer wedge ring (8), and the elastic tensioning mechanism comprises a tensioning ring (14) and an elastic tensioning mechanism. The tensioning ring (14) is installed in the gap cavity, and the elastic tensioning mechanism is used to pull the wedge ring sealing mechanism toward the central fixing mechanism. The locking mechanism passes through the tensioning ring (14).

3. The multi-stage sealing structure of the wedge ring compression type pipeline plugging device according to claim 2 is characterized in that: The tension ring (14) is annular, the outer circumferential surface of the tension ring (14) is provided with a first inflatable extrusion ring (16), the inner circumferential surface of the tension ring (14) is provided with a second inflatable extrusion ring (15), the inner circumferential surface of the outer wedge ring (8) is provided with a first annular cavity (83), the outer circumferential surface of the inner wedge ring (17) is provided with a second annular cavity (18), the first inflatable extrusion ring (16) is buckled into the first annular cavity (83), and the second inflatable extrusion ring (15) is buckled into the second annular cavity (18); The locking mechanism comprises a locking rod (4) and two end plates (3), the two end plates (3) are located at the outer ends of the first wedge ring (6) and the second wedge ring (9), the locking rod (4) passes through the end plate (3), the first wedge ring (6), the tensioning ring (14), and the second wedge ring (9) in sequence, and a sealing cavity (41) is formed in the middle of the locking rod (4), and the locking rod (4) is located at one end opening of the elastic tensioning mechanism; Each locking rod (4) is provided with an air guide tube at a position corresponding to the first inflatable extrusion ring (16) and the second inflatable extrusion ring (15), and the sealing cavity (41) is connected to the first inflatable extrusion ring (16) and the second inflatable extrusion ring (15) through the air guide tube.

4. The multi-stage sealing structure of the wedge ring compression type pipeline sealing device according to claim 3 is characterized in that: The elastic tensioning mechanism comprises a driving rod (12), a spring (100) and a sealing plug (22); one end of the driving rod (12) is fixed on the central fixing mechanism, and the other end extends into the sealing cavity (41) inside the locking rod (4); the sealing plug (22) is installed on the driving rod (12); the sealing plug (22) seals the opening end of the sealing cavity (41); the spring (100) is sleeved on the outside of the driving rod (12), and one end of the spring (100) is fixedly connected to the end plate (3), and the other end is fixedly connected to the central fixing mechanism; when the entire wedge ring sealing mechanism moves toward the central fixing mechanism, the gas in the sealing cavity (41) is squeezed out through the air guide tube into the inflation extrusion ring.

5. The multi-stage sealing structure of the wedge ring compression type pipeline sealing device according to claim 3 is characterized in that: A limiting nut (42) is provided at one end of the locking rod (4), and an external thread section is provided at the other end of the locking rod (4). A locking nut (5) is installed on the external thread section. The locking nut (5) is used to lock the two end plates (3) and the two end plates (3) are used to squeeze the first wedge ring (6) and the second wedge ring (9).

6. The multi-stage sealing structure of the wedge ring compression type pipeline plugging device according to claim 5 is characterized in that: A conical hole is provided on the first wedge ring (6) and the second wedge ring (9) at a position corresponding to each locking rod (4), and a conical wedge block (24) is provided in each conical hole. The conical wedge block (24) is inserted into the conical hole and one end of the conical wedge block protrudes from the outside of the first wedge ring (6) and the second wedge ring (9), and the protruding end is in contact with the end plate (3). The locking rods (4) are all provided through the conical wedge block (24).

7. The multi-stage sealing structure of the wedge ring compression type pipeline plugging device according to claim 1 is characterized in that: The outer circumferential surface of the outer wedge ring (8) is provided with at least one first dividing groove, a first dividing ring (7) is arranged in the first dividing groove, the first dividing ring (7) is slightly convex from the outer circumferential surface of the outer wedge ring (8), and the first dividing ring (7) is in contact and pressed against the inner wall surface of the through hole (1); At least one second dividing groove (23) is arranged on the inner ring surface of the inner wedge ring (17), a second dividing ring (20) is arranged in the second dividing groove (23), the second dividing ring (20) is slightly convex from the inner circular surface of the inner wedge ring (17), and the second dividing ring (20) is in contact and pressed against the outer wall surface of the pipeline (2).

8. The multi-stage sealing structure of the wedge ring compression type pipeline plugging device according to claim 7 is characterized in that: A first extension ring (81) is provided at the position where the end surfaces on both sides of the outer wedge ring (8) are connected to the outer circumferential surface of the outer wedge ring (8), and the first extension ring (81) extends towards the outer circumferential surfaces of the first wedge ring (6) and the second wedge ring (9) respectively; A second extension ring (19) is provided at the position where the end surfaces on both sides of the inner wedge ring (17) are connected to the outer circumferential surface of the inner wedge ring (17), and the second extension ring (19) extends toward the inner circumferential surfaces of the first wedge ring (6) and the second wedge ring (9) respectively; When the outer wedge ring (8) and the inner wedge ring (17) are subjected to radial compression by the tension ring (14), the outer wedge ring (8) and the inner wedge ring (17) respectively use the first dividing groove and the second dividing groove (23) as center points, and the extension rings on both sides shrink and move inward toward the first wedge ring (6) and the second wedge ring (9), respectively, and the first extension ring (81) and the second extension ring (19) are used to seal the two ends of the first wedge ring (6) and the second wedge ring (9).

9. The multi-stage sealing structure of the wedge ring compression type pipeline plugging device according to claim 8, characterized in that: Sealing buckle grooves are provided on the outer circumferential surfaces of the first wedge ring (6) and the second wedge ring (9) at positions corresponding to the first extension ring (81) and the second extension ring (19); the first extension ring (81) and the second extension ring (19) are buckled into the sealing buckle grooves through their inner contractions; and the first dividing groove and the second dividing groove (23) have a V-shaped cross section.

10. The multi-stage sealing structure of the wedge ring compression type pipeline plugging device according to claim 1, characterized in that: The central fixing mechanism comprises a fixing plate (11), the inner circumferential surface of the fixing plate (11) is fixedly bonded to the outer circumferential surface of the pipeline (2), the outer circumferential surface of the fixing plate (11) is fixedly bonded to the inner wall surface of the through hole (1), and fixing rods (10) are fixedly arranged on both sides of the fixing plate (11) corresponding to each driving rod (12), and one end of the driving rod (12) is fixedly mounted on the end surface of the fixing rod (10).

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