Double-expansion-ring sealing device for trenchless repair of underground pipeline

Abstract

The utility model relates to the field of underground pipeline repairing, in particular to a double-expansion-ring sealing device for underground pipeline non-excavation repairing, which comprises a rubber pipe and extrusion type sealing mechanisms connected to two ends of the surface of the rubber pipe respectively, and protective rings with L-shaped sections are symmetrically arranged at two ends of the inner side of the rubber pipe respectively. Expansion ring sealing structures are installed between the protection rings respectively, projections of the expansion ring sealing structures fall into projection planes of the corresponding extrusion type sealing mechanisms respectively, and each expansion ring sealing structure comprises elastic arc-shaped plates which are symmetrically and oppositely arranged. The elastic arc-shaped plate is matched with the fixed plug block to adapt to the curvature and local deformation of the pipeline, the elastic arc-shaped plate is driven to contract in the radial direction of the rubber pipe through gradual pressure applying of the fixed plug block, the rubber pipe and the inner wall of the pipeline are extruded to be tightly sealed, and in addition, the fixed plug block moves towards the rubber pipe through the sealing driving piece to make the fixed plug block make tight contact with the rubber pipe. And the corresponding outer side of the rubber pipe is tightly attached to the pipe wall, so that the sealing effect is further enhanced.

Description

Technical Field

[0001] This utility model relates to the field of underground pipeline repair, and in particular to a double expansion ring sealing device for trenchless repair of underground pipelines. Background Technology

[0002] Trenchless repair of underground pipelines is a technology that repairs aging, damaged, or malfunctioning underground pipelines without damaging the surface or extensively excavating the pipeline. In trenchless repair of underground pipelines, leaks can easily occur at the interface between new and old pipelines or between the lining and the original pipeline due to gaps, misalignment, or deformation. This is addressed by installing double expansion rings to achieve water sealing and repair. During repair, a ring-shaped rubber water-stop sealing strip is installed at the pipeline interface or locally damaged area, and stainless steel expansion rings are used for fixing and pressurizing. The radial expansion fills the gaps, forming a dynamic sealing interface that adapts to irregular pipeline shapes, such as elliptical deformation, misaligned interfaces, and other leakage phenomena, thereby achieving the effect of water sealing.

[0003] Regarding the aforementioned technologies, the inventors discovered that double expansion rings mainly rely on a fixed plug to continuously fix the expansion ring, causing the rubber sealing strip to expand and fill the gap. However, the pressure at both ends is mainly concentrated on the stainless steel expansion ring, while the pressure on the side closer to the rubber tube is relatively small, which can easily lead to insufficient mechanical stress. At the same time, under continuous pressure or temperature, slow deformation will occur, causing uneven contact between the corresponding position of the rubber tube and the tube wall. Moreover, over time, this uneven contact may intensify, thereby increasing the risk of leakage. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a double expansion ring sealing device for trenchless repair of underground pipelines, which makes it easy for the fixing plug to fit against the inner side of the rubber tube, so that it is in continuous contact with the pipe wall and reduces the risk of leakage.

[0005] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: providing a double expansion ring sealing device for trenchless repair of underground pipelines, comprising: a rubber tube and a compression sealing mechanism respectively connected to both ends of its surface, wherein the inner ends of the rubber tube are respectively provided with protective rings with L-shaped cross sections, and expansion ring sealing structures are respectively installed between the protective rings, and the projections of the expansion ring sealing structures fall into the projection planes of the corresponding compression sealing mechanisms;

[0006] The expansion ring sealing structure includes symmetrically arranged and oppositely arranged elastic arc plates. The curvature of the elastic arc plates matches the curvature of the rubber tube. Fixed plugs are respectively connected to the opposite ends of the elastic arc plates. Auxiliary driving blocks are respectively symmetrically connected to the inner side of the elastic arc plates. When the fixed plugs are respectively clamped between the ends of the elastic arc plates, they are suitable for driving the elastic arc plates to move towards the rubber tube.

[0007] The opposing ends of the elastic arc-shaped plates are respectively connected to sealing drive components with locking functions, and the sealing drive components are adapted to drive the fixed plug to move towards the rubber tube.

[0008] By adopting the above technical solution, the L-shaped protective ring can not only provide radial support force and limit the excessive expansion and deformation of the rubber tube under high pressure, but also form a guide positioning groove between the two to ensure that the expansion ring sealing structure is aligned with the pipeline axis during installation, reducing the risk of misalignment. The elastic arc plate and the fixed plug cooperate with each other to adapt to the curvature and local deformation of the pipeline. The fixed plug gradually applies pressure to drive the elastic arc plate to contract radially towards the rubber tube, achieving asymmetric pressure compensation and squeezing the rubber tube to make it tightly sealed with the inner wall of the pipeline. In addition, the sealing drive causes the fixed plug to move towards the rubber tube, making it in close contact with the rubber tube and causing the corresponding outer side of the rubber tube to fit tightly with the pipe wall, compensating for the loss of sealing force caused by creep and further enhancing the sealing effect.

[0009] In a preferred embodiment, the present invention can be further configured as follows: the sealing drive component includes a U-shaped movable plate and a connecting block connected to one end of an elastic arc plate. Movable grooves are respectively opened on both sides of the other end of the elastic arc plate. A limiting protrusion is integrally formed and connected to the inner side of the opening end of the U-shaped movable plate. The limiting protrusion is slidably connected in the movable groove. A limiting plate is connected to one side of the U-shaped movable plate. The connecting block is located between the limiting plate and the elastic arc plate. An oblong hole is opened on the limiting plate. Threaded holes are opened at intervals on the connecting block. A plurality of limiting holes are opened at intervals on the oblong hole. The invention also includes an internal hexagonal limiting screw. After the internal hexagonal limiting screw is threadedly connected to the corresponding threaded hole, it is suitable for driving the fixed plug to move towards the rubber tube. The internal hexagonal limiting screw is located in the corresponding limiting hole.

[0010] By adopting the above technical solution, the U-shaped movable plate and the limiting protrusion cooperate to limit the movement trajectory of the U-shaped movable plate. When the fixed plug applies pressure to drive the elastic arc plate to move radially towards the rubber tube, the sliding limiting plate makes the limiting hole on the waist-shaped hole correspond to the threaded hole. The displacement of the fixed plug is controlled by the screwing depth of the internal hexagonal screw, and the thread is tightened to gradually squeeze the fixed plug. The rotational torque is converted into axial thrust to drive the fixed plug to compress the rubber tube, and one end of the hexagonal limiting screw is gradually restricted in the limiting hole to prevent it from deviating from the predetermined position, thereby maintaining the stability and reliability of the sealing drive component.

[0011] In a preferred embodiment, the present invention can be further configured such that the compression sealing mechanism includes a plurality of rubber rings spaced apart, with clearance gaps formed between the rubber rings.

[0012] By adopting the above technical solution, when the fixed plug applies pressure to drive the elastic arc plate to move radially towards the rubber tube, the rubber tube continuously approaches the pipe wall, and the rubber ring undergoes elastic deformation, tightly fitting the inner wall of the pipe, increasing the contact area between the sealing mechanism and the inner wall of the pipe. Furthermore, under the action of the clearance gap, the rubber ring can flexibly adapt to the shape changes of the inner wall of the pipe, avoiding installation difficulties or poor sealing effect caused by the irregular shape of the inner wall of the pipe, and ensuring the tightness and stability of the seal.

[0013] In a preferred embodiment, the present invention can be further configured such that the rubber ring has V-shaped grooves along its circumference.

[0014] By adopting the above technical solution, the V-groove increases the contact area between the rubber ring and the inner wall of the pipe, thereby improving the sealing effect. When the rubber ring is under pressure, the opening of the V-groove will expand slightly, allowing the rubber material to better fill the tiny gaps in the inner wall of the pipe, forming a tighter sealing interface and better adapting to the irregular shape of the inner wall of the pipe.

[0015] In a preferred embodiment, the present invention can be further configured such that the rubber ring has a plurality of V-shaped openings arranged in a ring along its axial direction.

[0016] By adopting the above technical solution, the axial V-shaped opening transforms radial compressive stress into axial shear stress, and achieves uniform stress distribution through a ring array. When the pipe undergoes elliptical deformation, the V-shaped opening provides a multi-directional deformation path, causing the rubber ring to undergo three-dimensional non-uniform compression, avoiding local over-hardening or tearing. When there are minor axial unevenness or deformation on the inner wall of the pipe, the V-shaped opening allows the rubber ring to undergo appropriate compression or expansion in these areas, thereby better fitting the inner wall of the pipe and ensuring the tightness and stability of the seal.

[0017] In a preferred embodiment, the present invention can be further configured such that the width of the expansion ring sealing structure is greater than the distance between the opposite sides of two adjacent rubber rings.

[0018] By adopting the above technical solution, when the width of the expansion ring sealing structure is greater than the distance between the opposite sides of two adjacent rubber rings, the expansion ring can better cover and compress the gap between the rubber rings during the expansion process, which helps to prevent the medium from leaking through these gaps, thereby enhancing the overall sealing effect.

[0019] In summary, this utility model includes at least the following beneficial technical effects of the double expansion ring sealing device for trenchless repair of underground pipelines:

[0020] 1. The elastic arc plate and the fixed plug cooperate with each other to adapt to the curvature and local deformation of the pipeline. The fixed plug gradually applies pressure to drive the elastic arc plate to contract radially towards the rubber tube and squeeze the rubber tube to make it tightly seal with the inner wall of the pipeline. In addition, the sealing drive causes the fixed plug to move towards the rubber tube, so that it makes close contact with the rubber tube and promotes the corresponding outer side of the rubber tube to fit tightly with the pipe wall, further enhancing the sealing effect.

[0021] 2. When the fixed plug applies pressure to drive the elastic arc plate to move radially towards the rubber tube, the rubber tube continuously approaches the pipe wall. The V-groove increases the contact area between the rubber ring and the inner wall of the pipe, thereby improving the sealing effect. When the rubber ring is under pressure, the opening of the V-groove will slightly expand, allowing the rubber material to better fill the tiny gaps in the inner wall of the pipe, forming a tighter sealing interface and better adapting to the irregular shape of the inner wall of the pipe, further enhancing the sealing effect. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is an exploded view of the expansion ring sealing structure of this utility model;

[0025] Figure 3 for Figure 2 Enlarged view of point A in the image;

[0026] Figure 4 This is a schematic diagram of the V-groove structure of this utility model;

[0027] Figure 5 This is a schematic diagram of the V-shaped opening of this utility model.

[0028] In the diagram: 1. Rubber tube; 20. Compression sealing mechanism; 3. Protective ring; 40. Expansion ring sealing structure; 21. Rubber ring; 22. V-groove; 23. V-shaped opening;

[0029] 41. Elastic arc-shaped plate; 42. Fixed plug; 43. Auxiliary drive block; 44. Sealing drive component;

[0030] 441. U-shaped movable plate; 442. Connecting block; 443. Movable groove; 444. Limiting protrusion; 445. Limiting plate; 446. Waist-shaped hole; 447. Threaded hole; 448. Limiting hole; 449. Hexagonal limiting screw. Detailed Implementation

[0031] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0032] It should be noted that these figures are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0033] Example 1

[0034] Reference Figure 1 - Figure 4 This utility model discloses a double expansion ring sealing device for trenchless repair of underground pipelines, comprising: a rubber tube 1 and compression sealing mechanisms 20 respectively connected to both ends of the tube 1. The inner ends of the rubber tube 1 are symmetrically provided with L-shaped protective rings 3. Expansion ring sealing structures 40 are installed between the protective rings 3. The projections of the expansion ring sealing structures 40 fall into the projection planes of the corresponding compression sealing mechanisms 20. Each expansion ring sealing structure 40 includes symmetrically and oppositely arranged elastic arc plates 41. The curvature of the elastic arc plates 41 matches the curvature of the rubber tube 1. Fixed plugs 42 are respectively connected to the opposite ends of the elastic arc plates 41. Auxiliary driving blocks 43 are symmetrically connected to the inner sides of the elastic arc plates 41. When the fixed plugs 42 are respectively clamped between the ends of the elastic arc plates 41… The elastic arc plate 41 is suitable for driving the elastic arc plate 41 to move towards the rubber tube 1. The opposite ends of the elastic arc plate 41 are respectively connected to the sealing drive component 44 with locking function. The sealing drive component 44 is suitable for driving the fixed plug 42 to move towards the rubber tube 1. The protective ring 3 is made of fluororubber. When the elastic arc plate 41 is installed, the protective ring 3 can not only ensure that it is aligned with the pipeline axis and reduce the risk of misalignment, but also provide radial support force for the rubber tube 1, limit the excessive expansion and deformation of the rubber tube 1 under high pressure, and drive the elastic arc plate 41 to radially contract towards the rubber tube 1 through the pressure of the fixed plug 42, so as to achieve asymmetric pressure compensation and squeeze the rubber tube 1 so that its outer surface is in close contact with the inner wall of the pipeline. At the same time, the rubber ring 21 is squeezed to make it elastically deformed and tightly fit the inner wall of the pipeline, further enhancing the sealing effect.

[0035] The sealing drive component 44 includes a U-shaped movable plate 441 and a connecting block 442 connected to one end of the elastic arc plate 41. Movable grooves 443 are respectively opened on both sides of the other end of the elastic arc plate 41. Limiting protrusions 444 are integrally formed and connected to the inner side of the open end of the U-shaped movable plate 441. The limiting protrusions 444 are slidably connected within the movable grooves 443. A limiting plate 445 is connected to one side of the U-shaped movable plate 441. The connecting block 442 is located between the limiting plate 445 and the elastic arc plate 41. A slotted hole 446 is opened on the limiting plate 445. Threaded holes 447 are spaced apart on the connecting block 442. Several limiting holes 448 are spaced apart on the slotted hole 446. It also includes an internal hexagonal limiting screw 449. After the internal hexagonal limiting screw 449 is threadedly connected to the corresponding threaded hole 447, it is suitable for driving the fixed... The fixed plug 42 moves toward the rubber tube 1, and the internal hexagonal limiting screw 449 is located in the corresponding limiting hole 448; the limiting protrusion 444 limits the movement trajectory of the U-shaped movable plate 441, preventing the sealing drive 44 from deviating from the preset path, and when the fixed plug 42 applies pressure to drive the elastic arc plate 41 to move radially toward the rubber tube 1, the sliding limiting plate 445 makes the limiting hole 448 on the waist-shaped hole 446 correspond to the threaded hole 447. The displacement of the fixed plug 42 is controlled by the screwing depth of the internal hexagonal limiting screw 449, the thread is tightened and it is gradually squeezed to compress the fixed plug 42, driving the fixed plug 42 to compress the rubber tube 1, so that one end of the internal hexagonal limiting screw 449 is gradually restricted in the limiting hole 448, preventing it from deviating from the predetermined position, thereby maintaining the stability and reliability of the sealing drive 44.

[0036] The compression sealing mechanism 20 includes several rubber rings 21 spaced apart, with clearance gaps between them. Each rubber ring 21 has a V-shaped groove 22 along its circumference. The angle of the V-shaped groove 22 is 30°-60°, the groove depth is 15%-25% of the rubber cross-sectional thickness, and the groove spacing is 2-3 times the groove width to ensure a smooth transition of stress gradient during compression. In addition, the surface ends of the rubber ring 21 are rounded with R0.1-R0.3 to avoid stress concentration leading to tearing. When the rubber ring 21 is under pressure, the opening of the V-shaped groove 22 will slightly expand, allowing the rubber ring 21 to better fill the tiny gaps in the inner wall of the pipe, forming a tighter sealing interface and better adapting to the irregular shape of the inner wall of the pipe.

[0037] The width of the expansion ring sealing structure 40 is greater than the distance between the opposite sides of two adjacent rubber rings 21. The wider design of the expansion ring sealing structure 40 can increase its contact area with the inner wall of the pipe, thereby improving the stability of the structure. When subjected to external pressure or temperature changes, it can better resist deformation and maintain the tightness and durability of the seal.

[0038] Example 2

[0039] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5 Based on Embodiment 1, this utility model provides a technical solution:

[0040] The rubber ring 21 has several V-shaped openings 23 arranged in a ring along its axis. The V-shaped openings 23 are arranged in a ring with equal spacing of 10-20mm along the axis of the rubber ring 21. The angle of the V-shaped openings 23 is 30°-60°, and its depth accounts for 15%-25% of the thickness of the rubber cross section. In addition, a rounded transition area R0.3-R0.5 can be set at the end of the V-shaped openings 23 to avoid stress concentration. When the pipe undergoes elliptical deformation, the V-shaped openings 23 provide a multi-directional deformation path, allowing the rubber ring 21 to be appropriately compressed or expanded in these areas, thereby better fitting the inner wall of the pipe and ensuring the tightness and stability of the seal.

[0041] The implementation principle of this embodiment is as follows: During use, the pipeline to be repaired is cleaned to ensure that the construction area is clean and free of impurities. Then, the rubber tube 1 is installed in the corresponding area, and a special hydraulic device is used to sequentially drive the symmetrical auxiliary drive blocks 43 on the two elastic arc plates 41 to apply pressure, widening the gap between the ends of the elastic arc plates 41 to insert the fixing plug 42, and driving the elastic arc plates 41 to contract radially towards the rubber tube 1. Subsequently, the rubber ring 21 is tightly attached to the inner wall of the pipeline due to the pressure. At this time, the V-groove 22 or V-shaped opening 23 deforms, allowing the rubber ring 21 to better fill the tiny gaps in the inner wall of the pipeline. The gap forms a tighter sealing interface. At this time, the two elastic arc plates 41 play a role in fixing and enhancing the sealing effect. Then, the operator slides the limiting plate 445 so that the limiting hole 448 on the waist-shaped hole 446 corresponds to the threaded hole 447. The displacement of the fixing block 42 is controlled by the screwing depth of the internal hexagonal limiting screw 449. The thread is tightened and it is gradually squeezed to compress the fixing block 42, driving the fixing block 42 to compress the rubber tube 1 so that the surface of the rubber tube 1 and the tube wall are in contact. At this time, one end of the internal hexagonal limiting screw 449 is gradually restricted in the limiting hole 448 to prevent it from deviating from the predetermined position.

[0042] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A double expansion ring sealing device for trenchless repair of underground pipelines, characterized in that, include: A rubber tube (1) and a compression sealing mechanism (20) connected to both ends of its surface. The inner ends of the rubber tube (1) are respectively provided with protective rings (3) with L-shaped cross sections. An expansion ring sealing structure (40) is installed between the protective rings (3). The projection of the expansion ring sealing structure (40) falls into the projection plane of the corresponding compression sealing mechanism (20). The expansion ring sealing structure (40) includes symmetrically arranged and oppositely arranged elastic arc plates (41). The curvature of the elastic arc plates (41) matches the curvature of the rubber tube (1). The opposite ends of the elastic arc plates (41) are respectively connected to fixed plugs (42). The inner side of the elastic arc plates (41) is symmetrically connected to auxiliary driving blocks (43). When the fixed plugs (42) are respectively clamped between the ends of the elastic arc plates (41), they are suitable for driving the elastic arc plates (41) to move towards the rubber tube (1). The opposing ends of the elastic arc plate (41) are respectively connected to a sealing drive member (44) with a locking function. The sealing drive member (44) is adapted to drive the fixed plug (42) to move toward the rubber tube (1).

2. The double expansion ring sealing device for trenchless repair of underground pipelines according to claim 1, characterized in that, The sealing drive component (44) includes a U-shaped movable plate (441) and a connecting block (442) connected to one end of the elastic arc plate (41). Movable grooves (443) are respectively opened on both sides of the other end of the elastic arc plate (41). Limiting protrusions (444) are integrally formed and connected to the inner side of the open end of the U-shaped movable plate (441). The limiting protrusions (444) are slidably connected within the movable grooves (443). A limiting plate (445) is connected to one side of the U-shaped movable plate (441). The connecting block (442) is located within the limiting plate (445). 5) Between the elastic arc plate (41), the limiting plate (445) is provided with a waist-shaped hole (446), the connecting block (442) is provided with threaded holes (447) spaced apart, the waist-shaped hole (446) is provided with a number of limiting holes (448) spaced apart, and also includes an internal hexagonal limiting screw (449). After the internal hexagonal limiting screw (449) is threadedly connected to the corresponding threaded hole (447), it is suitable for driving the fixed plug (42) to move towards the rubber tube (1), and the internal hexagonal limiting screw (449) is located in the corresponding limiting hole (448).

3. The double expansion ring sealing device for trenchless repair of underground pipelines according to claim 1, characterized in that, The compression sealing mechanism (20) includes a plurality of rubber rings (21) spaced apart, with clearance gaps formed between the rubber rings (21).

4. The double expansion ring sealing device for trenchless repair of underground pipelines according to claim 3, characterized in that, The rubber ring (21) is provided with V-shaped grooves (22) along its circumference.

5. The double expansion ring sealing device for trenchless repair of underground pipelines according to claim 3, characterized in that, The rubber ring (21) has several V-shaped openings (23) arranged in a ring along its axial direction.

6. The double expansion ring sealing device for trenchless repair of underground pipelines according to claim 3, characterized in that, The width of the expansion ring sealing structure (40) is greater than the distance between the opposite sides of two adjacent rubber rings (21).

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