A quick emergency repair device suitable for medium leakage of an external pressure type expansion joint

Abstract

The utility model provides a kind of suitable for the quick emergency repair device of outer pressure type expansion joint medium leakage, comprising: cylinder, the cylinder includes the left cylinder and right cylinder same structure, the left cylinder is connected with right cylinder cooperation, for the end of expansion joint on pipeline is covered and sealed;First sealing ring is provided on the cylinder, and the first sealing ring is used between the outer tube of cylinder front end and expansion joint, the sealing between cylinder rear end and pipeline;Pipe valve assembly is provided on the cylinder, for discharging high-pressure medium in cylinder;Sealing assembly is provided on the rear side of cylinder, and the sealing assembly is installed on pipeline, for the sealing between cylinder and pipeline;The present application can quickly, effectively isolate the leakage medium of outer pressure type expansion joint end and outside, provide safe and reliable guarantee for expansion joint emergency repair, and overall structure is simple, install rapidly, applicable to various types of expansion joint.

Description

Technical Field

[0001] This utility model relates to the field of pressure pipeline technology, and more specifically, to a rapid emergency repair device suitable for media leakage in external pressure expansion joints. Background Technology

[0002] External pressure expansion joints, as compensators for pressure pipelines, possess advantages such as strong resistance to instability, low corrosion risk, and high reliability. They exhibit significant performance in high-temperature, high-pressure, vacuum, and large-diameter pipelines, leading to their widespread application. However, under long-term complex operating conditions, bellows or welded joints may leak due to media erosion, temperature changes, alternating stress, vibration, and impact. The media leaks to the outside through the outlet support pipe, posing a hazard to personnel, equipment, and the pipeline system near the expansion joint. While structural improvements and health monitoring cannot completely prevent leaks, research into emergency repair technologies is essential.

[0003] Existing rapid emergency repair technologies, such as polyurethane pressure grouting and carbon nanotube polymer material plugging, can plug leaks under pressure, but require identifying the leak location, are difficult to implement, and require a high level of engineering experience from the workers. Technologies such as flange bolt re-tightening and temporary welding repairs are quick to take effect, but pose safety risks to the workers.

[0004] Patents CN111306399B and CN119508623A propose a rapid emergency repair technology that involves installing a covering component outside the leaking part of the expansion joint. This technology can repair the expansion joint without shutting down the system, but it still has the following problems: the covering structure is a single-layer segmented structure, which requires on-site longitudinal seam welding, making construction difficult, inefficient, and with a long shutdown period; the stiffness of the newly added covering structure is much greater than that of the original expansion joint, increasing the stress on the piping system and pipe ends, and bringing new risks of failure or leakage. Utility Model Content

[0005] In view of this, the present invention aims to propose a rapid emergency repair device for media leakage in external pressure expansion joints to solve the problems of high construction difficulty, low efficiency and long shutdown period when repairing the outlet support pipe of external pressure expansion joints in the prior art.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] A rapid emergency repair device for media leakage in external pressure expansion joints includes: a cylinder comprising a left cylinder and a right cylinder with identical structures, the left cylinder and the right cylinder being connected to each other for sealing the end of the expansion joint on the pipeline; a first sealing ring provided on the cylinder for sealing between the cylinder and the outer pipe of the expansion joint, as well as between the cylinder and the pipeline; a connecting valve assembly provided on the cylinder for discharging high-pressure media inside the cylinder; and a sealing assembly provided on the rear side of the cylinder, the sealing assembly being installed on the pipeline for sealing between the cylinder and the pipeline.

[0008] Furthermore, the front end of the cylinder is connected to the outer pipe, and the rear end of the cylinder is provided with a sealing sleeve, which is connected to the pipe on the rear side of the expansion joint.

[0009] Furthermore, the sealing assembly includes an annular sealing cap, a fixing plate, and a second sealing ring. The rear end of the sealing sleeve is provided with an annular plate, the sealing cap is mounted on the annular plate through the fixing plate, and the second sealing ring is disposed between the annular plate, the sealing cap, and the pipe for sealing the rear end of the cylinder.

[0010] Furthermore, the fixing plate is mounted on the ring plate, and the sealing cover is fixed together with the connecting plate by bolts.

[0011] Furthermore, the front of the sealing gland is provided with a clearance step to avoid the connecting plate.

[0012] Furthermore, it also includes a stop block, which is disposed on the outer tube and located on the front side of the cylinder, and is used to limit the front end of the cylinder.

[0013] Furthermore, multiple baffles are evenly arranged around the outer tube, and the baffles are connected to the outer tube by welding.

[0014] Furthermore, the first sealing ring includes a left sealing ring and a right sealing ring. The left sealing ring is disposed on the left cylinder, and the right sealing ring is disposed on the right cylinder. The left sealing ring and the right sealing ring cooperate to cover and seal the end of the expansion joint.

[0015] Furthermore, a left connecting plate is provided on the left cylinder and a right connecting plate is provided on the right cylinder. The left connecting plate includes an upper left connecting plate and a lower left connecting plate. The upper left connecting plate is located at the upper end of the left cylinder and the lower left connecting plate is located at the lower end of the left cylinder. The right connecting plate includes an upper right connecting plate and a lower right connecting plate. The upper right connecting plate is located at the upper end of the right cylinder and the lower right connecting plate is located at the lower end of the right cylinder. The upper left connecting plate and the upper right connecting plate, as well as the lower left connecting plate and the lower right connecting plate, are all connected together by bolts.

[0016] Furthermore, the left cylinder and the left connecting plate, and the right cylinder and the right connecting plate, are fixed together by welding.

[0017] Compared with existing technologies, the rapid emergency repair device for media leakage in external pressure expansion joints described in this utility model has the following advantages:

[0018] 1) It can quickly and effectively isolate the leaking medium at the end of the external pressure expansion joint from the outside world, providing a safe and reliable guarantee for emergency repair of the expansion joint. The overall structure is simple, the installation is quick, and it is suitable for various types of expansion joints.

[0019] 2) By installing a sealing component on the rear side of the cylinder, the sealing effect at the end of the expansion joint can be further enhanced, and the sealing component can move on the pipeline as the expansion joint expands and contracts; allowing the expansion joint to freely perform its compensating function and ensuring the safety and stability of the pipeline system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the emergency repair device described in an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the right-middle cylinder;

[0022] Figure 3 This is a schematic diagram of the installation structure of the emergency repair device in an embodiment of this utility model;

[0023] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Cylinder body; 11. Left cylinder body; 111. Left connecting plate; 1111. Upper left connecting plate; 1112. Lower left connecting plate; 12. Right cylinder body; 121. Right connecting plate; 1211. Upper right connecting plate; 1212. Lower right connecting plate; 2. First sealing ring; 21. Left sealing ring; 22. Right sealing ring; 3. Pipe valve assembly; 4. Stop block; 5. Sealing sleeve; 51. First sealing sleeve; 52. Second sealing sleeve; 53. Ring plate; 6. Sealing assembly; 61. Sealing gland; 611. Step; 62. Fixing plate; 63. Second sealing ring; 100. Pipe; 200. Expansion joint; 201. Outer pipe. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the described embodiments are only some, not all, of the embodiments of this invention. The specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] Example 1

[0028] like Figure 1-4 As shown, this embodiment provides a rapid emergency repair device suitable for media leakage in external pressure expansion joints, comprising: a cylinder 1, the cylinder 1 including a left cylinder 11 and a right cylinder 12 with identical structures, the left cylinder 11 and the right cylinder 12 being connected to each other for sealing the end of the expansion joint 200 on the pipeline 100; a first sealing ring 2 is provided on the cylinder 1, the first sealing ring 2 being used for sealing between the front end of the cylinder 1 and the outer pipe 201 of the expansion joint 200, and between the rear end of the cylinder 1 and the pipeline 100; a connecting valve assembly 3 is provided on the cylinder 1 for discharging the high-pressure medium inside the cylinder 1; a sealing assembly 6 is provided on the rear side of the cylinder 1, the sealing assembly 6 being installed on the pipeline 100 for sealing between the cylinder 1 and the pipeline 100.

[0029] In detail, cylinder 1 is composed of two identical left and right cylinders connected together, both of which are semi-circular ring structures. This segmented design eliminates the need for on-site longitudinal seam welding, allowing for rapid assembly via bolts. Compared to the existing single-layer segmented covering structure requiring welding, this significantly reduces construction difficulty, improves installation efficiency, and shortens downtime. Simultaneously, the fit between the left and right cylinders tightly covers the end of the expansion joint 200, providing a basic support for the seal and confining the leaked medium within cylinder 1, preventing direct leakage to the outside and ensuring the safety of personnel and equipment. During installation, if high-pressure leakage from the end of the expansion joint 200 makes it difficult to connect cylinder 1, the valve assembly 3 can be opened to release the pressure inside the cylinder, facilitating rapid installation. After installation, the valve is closed to maintain pressure balance in the sealing system and prevent medium leakage. Furthermore, by installing a sealing assembly 6 on the rear side of cylinder 1, the sealing effect at the end of the expansion joint 200 is further enhanced, and the sealing assembly 6 can move along the pipeline 100 as the expansion joint 200 expands and contracts.

[0030] Understandably, the main function of an external pressure expansion joint is to compensate for the expansion and contraction of pipelines caused by temperature changes. If the sealing component 6 is fixed in place, it will restrict the normal expansion and contraction of the expansion joint 200, leading to stress concentration within the pipeline system and potentially causing damage to the pipeline 100 or the expansion joint 200. However, the sealing component 6 can move along the pipeline 100 as the expansion joint 200 expands and contracts, allowing the expansion joint 200 to freely perform its compensating function and ensuring the safety and stability of the pipeline system. On the other hand, the movable nature of the sealing component 6 means that it does not need to be precisely fixed to a specific position on the pipeline during installation, reducing installation difficulty. It also facilitates disassembly and reinstallation during later maintenance or repair, improving the ease of use of the emergency repair device.

[0031] By installing a sealing ring inside the cylinder 1, it is possible to ensure tight contact between the cylinder 1 and the pipe 100, and between the cylinder 1 and the outer pipe 201 of the expansion joint, to prevent leakage of gas or liquid media.

[0032] This application can quickly and effectively isolate the leaking medium at the end of the external pressure expansion joint from the outside world, providing a safe and reliable guarantee for emergency repair of the expansion joint. Moreover, the overall structure is simple, the installation is quick, and it is suitable for various types of expansion joints.

[0033] Preferably, the sealing ring is made of a high-temperature resistant material to be suitable for high-temperature media.

[0034] As a preferred example of this application, the front end of the cylinder 1 is connected to the outer pipe 201, and the rear end of the cylinder 1 is provided with a sealing sleeve 5, which is connected to the pipe 100 on the rear side of the expansion joint 200.

[0035] Specifically, this design prevents the medium from escaping from both ends of the cylinder 1, thus improving the sealing performance.

[0036] In detail, the sealing sleeve 5 includes a first sealing sleeve 51 and a second sealing sleeve 52. The first sealing sleeve 51 is located on the left cylinder 11, and the second sealing sleeve 52 is located on the right cylinder 12. The first sealing sleeve 51 and the second sealing sleeve 52 cooperate to cover the pipe 100.

[0037] Preferably, both the left cylinder 11 and the right cylinder 12 are semi-circular ring structures.

[0038] As a preferred example of this application, the sealing assembly 6 includes an annular sealing cap 61, a fixing plate 62, and a second sealing ring 63. The rear end of the sealing sleeve 5 is provided with an annular plate 53. The sealing cap 61 is mounted on the annular plate 53 through the fixing plate 62. The second sealing ring 63 is disposed between the annular plate 53, the sealing cap 61, and the pipe 100 for sealing the rear end of the cylinder 1.

[0039] Specifically, the ring plate 53 at the rear end of the sealing sleeve 5 provides a stable mounting base for the sealing assembly 6. After being fixed to the sealing gland 61 by the fixing plate 62, the sealing pressure can be evenly transmitted to the surface of the pipe 100. At the same time, it enhances the overall strength of the connection between the rear end of the cylinder 1 and the pipe 100, avoids structural deformation caused by medium pressure, and further enhances the sealing effect on the end of the expansion joint 200.

[0040] Understandably, the sealing assembly 6 is assembled from a left sealing assembly and a right sealing assembly with identical structures. The corresponding sealing gland 61, fixing plate 62, second sealing ring 63, and ring plate 53 are all divided into two identical parts, left and right. This arrangement facilitates quick installation and disassembly. Preferably, the left and right sealing glands and the left and right connecting plates can be connected by bolts.

[0041] As a preferred example of this application, the fixing plate 62 is mounted on the ring plate 53, and the sealing cover 61 is fixed together with the fixing plate 62 by bolts.

[0042] Specifically, the bolted connection is a detachable connection method, which does not require on-site welding or complex tools. The installation and removal of the sealing component 6 can be completed in a short time. When the medium leaks at the end of the external pressure expansion joint, the maintenance personnel can quickly install the sealing cover 61 on the fixed plate 62 with bolts to quickly build a sealing structure, effectively shorten the repair time, and meet the timeliness requirements of emergency repair.

[0043] On the other hand, the bolt connection can control the clamping force of the sealing gland 61 on the second sealing ring 63 by adjusting the tightening torque, so that the sealing ring is evenly compressed, avoiding medium leakage due to insufficient local pressure, and preventing damage to the sealing ring due to excessive compression. This adjustable connection method can accurately control the sealing effect according to the actual working conditions, ensuring the sealing reliability between the rear end of the cylinder 1 and the pipeline 100.

[0044] Preferably, the fixing plate 62 and the ring plate 53 are detachably connected, such as by snap-fit.

[0045] As a preferred example of this application, the front of the sealing cover 61 is provided with a clearance step 611 for clearance of the fixing plate 62.

[0046] Specifically, during the installation of the sealing assembly 6, the sealing gland 61 needs to be fitted and fixed to the fixing plate 62. The setting of the step 611 can reserve installation space for the fixing plate 62, prevent physical interference between the front of the sealing gland 61 and the fixing plate 62, ensure that the two can be accurately aligned when bolted, avoid assembly deviation caused by positional conflict, and improve the installation accuracy and reliability of the sealing assembly 6.

[0047] As a preferred example of this application, it also includes a stop 4, which is disposed on the outer tube 201 of the expansion joint 200, located on the front side of the cylinder 1, and is used to limit the front end of the cylinder 1.

[0048] Specifically, the external pressure type expansion joint may move axially during operation due to medium pressure or pipeline vibration. The stop block 4 can block the cylinder 1 from moving forward and prevent it from moving axially along the pipeline 100, ensuring that the relative position of the emergency repair device and the expansion joint 200 is fixed, avoiding deformation of the sealing ring or separation of the sealing surface due to displacement of the cylinder 1, thereby maintaining the reliability of the seal.

[0049] As a preferred example of this application, a plurality of baffles 4 are uniformly arranged around the outer tube 201, and the baffles 4 are connected to the outer tube 201 by welding.

[0050] Specifically, the evenly distributed multiple stops can form a balanced limiting force on the front end of the cylinder 1 from the circumference, avoiding uneven local force on the cylinder caused by single-point limiting, preventing the cylinder from tilting or deforming due to force deviation, ensuring the relative position stability of the emergency repair device and the expansion joint 200, and enhancing the reliability of the overall structure under medium pressure or pipeline vibration conditions.

[0051] Preferably, there are 2 to 4 blocks 4.

[0052] As a preferred example of this application, the first sealing ring 2 includes a left sealing ring 21 and a right sealing ring 22. The left sealing ring 21 is disposed on the left cylinder 11, and the right sealing ring 22 is disposed on the right cylinder 12. The left sealing ring 21 and the right sealing ring 22 cooperate to cover and seal the end of the expansion joint 200.

[0053] Specifically, the left and right sealing rings correspond one-to-one with the left and right cylinder structures. During installation, they can be quickly spliced ​​together with the cylinder segments, eliminating the need for on-site installation of the sealing rings as a whole. This avoids the problem of traditional integral sealing rings being difficult to position in segmented structures. This design matches the modular design of the cylinder, which can significantly shorten the installation time and meet the rapid response requirements for emergency repairs.

[0054] As a preferred example of this application, a left connecting plate 111 is provided on the left cylinder 11, and a right connecting plate 121 is provided on the right cylinder 12. The left connecting plate 111 includes an upper left connecting plate 1111 and a lower left connecting plate 1112. The upper left connecting plate 1111 is located at the upper end of the left cylinder 11, and the lower left connecting plate 1112 is located at the lower end of the left cylinder 11. The right connecting plate 121 includes an upper right connecting plate 1211 and a lower right connecting plate 1212. The upper right connecting plate 1211 is located at the upper end of the right cylinder 12, and the lower right connecting plate 1212 is located at the lower end of the right cylinder 12. The upper left connecting plate 1111 and the upper right connecting plate 1211, and the lower left connecting plate 1112 and the lower right connecting plate 1212 are all connected together by bolts.

[0055] Specifically, the left cylinder 11 and the right cylinder 12 are connected in a split manner through two pairs of upper and lower connecting plates, allowing for rapid assembly without on-site welding. In emergency repair scenarios, workers can directly place the two cylinder halves onto the expansion joint outer pipe 201 and the pipe 100, and complete the installation by tightening the bolts. Compared with traditional welding methods, this can greatly shorten the construction time and meet the requirements of "rapid response." At the same time, the upper and lower connecting plates are located at the upper and lower ends of the cylinder, respectively, forming a "symmetrical" force-bearing structure that can evenly distribute the medium thrust to the upper and lower bolt groups, avoiding local stress concentration.

[0056] Understandably, this embodiment is applicable to emergency repairs of media leakage in external pressure expansion joints. The left cylinder 11 and the right cylinder 12 are connected by bolts, replacing traditional welding, which can reduce construction difficulty and shorten installation time. By increasing the number of bolts and using high-strength bolts, the connection strength between the rapid emergency repair device and the expansion joint 200 can be enhanced to prevent high-pressure media leakage. By setting the stop block 4 and adjusting the size and number of the stop block 4, it can adapt to complex working conditions and ensure that the cylinder 1 does not undergo excessive displacement.

[0057] In detail, the right sealing ring 22 includes a first semi-ring sealing ring 221, an upper right sealing ring 222, a second semi-ring sealing ring 223, and a lower right sealing ring 224 connected in sequence. The left sealing ring 21 includes a third semi-ring sealing ring, an upper left sealing ring, a fourth semi-ring sealing ring, and a lower left sealing ring connected in sequence. The structure of the left sealing ring 21 is exactly the same as that of the right sealing ring 22. When the cylinder 1 is installed on the expansion joint 200, the first semi-ring sealing ring 221 and the third semi-ring sealing ring cooperate to seal between the front end of the cylinder 1 and the outer pipe 201. The second semi-ring sealing ring 223 and the fourth semi-ring sealing ring cooperate to seal between the sealing sleeve 5 and the rear pipe 100 of the expansion joint 200. The upper right sealing ring 222 and the upper left sealing ring cooperate to seal between the upper left connecting plate 1111 and the upper right connecting plate 1211. The lower right sealing ring 224 and the lower left sealing ring cooperate to seal between the lower left connecting plate 1112 and the lower right connecting plate 1212.

[0058] Furthermore, displacement may occur between the cylinder 1 and the expansion joint 200, causing the emergency repair device to fail and resulting in media leakage. In order to enhance the fixing effect of the cylinder 1 on the expansion joint 200, this embodiment provides a calculation method for selecting bolts to ensure safety.

[0059] With an external pressure of 1.6 MPa and an effective area of ​​0.44 m², 2 Take, for example, the external pressure axial expansion joint under high pressure conditions.

[0060] According to the pressure thrust algorithm in GBT12777-2019, the pressure thrust can be obtained from formula (1) as 704kN.

[0061] (1)

[0062] Where P is the external pressure on the bellows, and A is the effective area of ​​the bellows.

[0063] The calculation method for the frictional force f between the emergency repair device and the expansion joint is shown in formula (2).

[0064] (2)

[0065] Where F is the maximum preload of the bolt.

[0066] Under the action of 8.8 grade M24 bolts, the maximum preload of a single bolt is 158kN. Taking a conservative friction coefficient of 0.5, the frictional force provided by a single bolt is 79kN. 704 ÷ 79 ≈ 8.9 (bolts), meaning at least 9 bolts are required to prevent cylinder displacement. Considering the complexity of actual working conditions and safety margins, more bolts should be added or higher grade bolts should be used. In special working conditions, a stop block 4 can be installed to limit the rapid emergency repair device and ensure safety.

[0067] As a preferred example of this application, the left cylinder 11 and the left connecting plate 111, and the right cylinder 12 and the right connecting plate 121 are fixed together by welding.

[0068] Specifically, the welded connection forms a permanent rigid structure that can withstand the high-pressure medium thrust when the expansion joint leaks, and together with the sealing ring, it can achieve a "zero leakage" sealing effect.

[0069] Welded joints can reduce stress concentration through process optimization (such as beveling and post-weld heat treatment). Compared with the local clamping force of bolted connections, welded fixation distributes the load more evenly, making it especially suitable for dynamic working conditions where expansion joints 200 frequently expand and contract.

[0070] Preferably, the left cylinder 11 and the left connecting plate 111, and the right cylinder 12 and the right connecting plate 121 are integrally formed.

[0071] The one-piece molding process creates a seamless integral structure between the cylinder and the connecting plate, avoiding stress concentration problems that may exist in traditional welding or bolt connections. Under the thrust of high-pressure media, the overall structure can evenly distribute the load and reduce the risk of fracture.

[0072] Under long-term complex operating conditions, bellows or welded joints may leak due to media erosion, temperature changes, alternating stress, vibration, and impact. The media leaks through the end of expansion joint 200 to the outside, posing a hazard to personnel, equipment, and the pipeline system near the expansion joint. When a leak occurs, the two-part cylinder is fitted over the outer pipe 201 and the outside of pipe 100. After opening the connecting valve assembly 3 and tightening the bolts, installation is complete. Then, closing the connecting valve assembly 3 will prevent further leakage. The cylinder 1 is in close contact with the expansion joint 200 through a sealing ring, and the sealing assembly 6 seals the end of the expansion joint 200 to prevent gas or liquid media leakage. For corrosive and high-temperature media, corrosion-resistant and high-temperature-resistant sealing ring materials can be used. For high-pressure media, the connection between the emergency repair structure and the expansion joint can be strengthened by increasing the number and strength of bolts and installing a stop block 4 to prevent media leakage.

[0073] Although the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A rapid emergency repair device suitable for media leakage in external pressure expansion joints, characterized in that, include: The cylinder (1) includes a left cylinder (11) and a right cylinder (12) with the same structure. The left cylinder (11) and the right cylinder (12) are connected to each other and are used to cover and seal the end of the expansion joint (200) on the pipeline (100). A first sealing ring (2) is provided on the cylinder (1). The first sealing ring (2) is used to seal between the cylinder (1) and the outer pipe (201) of the expansion joint (200) and the pipeline (100). A pipe valve assembly (3) is provided on the cylinder (1) for discharging the high-pressure medium in the cylinder (1). A sealing assembly (6) is provided on the rear side of the cylinder (1). The sealing assembly (6) is installed on the pipeline (100) for sealing between the cylinder (1) and the pipeline (100).

2. The rapid emergency repair device for media leakage in external pressure expansion joints according to claim 1, characterized in that, The front end of the cylinder (1) is connected to the outer pipe (201), and the rear end of the cylinder (1) is provided with a sealing sleeve (5). The sealing sleeve (5) is connected to the pipe (100) on the rear side of the expansion joint (200).

3. The rapid emergency repair device for media leakage in external pressure expansion joints according to claim 2, characterized in that, The sealing assembly (6) includes an annular sealing cap (61), a fixing plate (62), and a second sealing ring (63). The rear end of the sealing sleeve (5) is provided with an annular plate (53). The sealing cap (61) is installed on the annular plate (53) through the fixing plate (62). The second sealing ring (63) is disposed between the annular plate (53), the sealing cap (61), and the pipe (100) for sealing the rear end of the cylinder (1).

4. The rapid emergency repair device for media leakage in external pressure expansion joints according to claim 3, characterized in that, The fixing plate (62) is installed on the ring plate (53), and the sealing cover (61) is fixed together with the fixing plate (62) by bolts.

5. The rapid emergency repair device for media leakage in external pressure expansion joints according to claim 3, characterized in that, The front of the sealing cap (61) is provided with a clearance step (611) to avoid the fixing plate (62).

6. The rapid emergency repair device for media leakage in external pressure expansion joints according to claim 1, characterized in that, It also includes a stop (4), which is disposed on the outer tube (201) and located on the front side of the cylinder (1) to limit the front end of the cylinder (1).

7. The rapid emergency repair device for media leakage in external pressure expansion joints according to claim 6, characterized in that, Multiple baffles (4) are evenly arranged around the outer tube (201), and the baffles (4) are connected to the outer tube (201) by welding.

8. The rapid emergency repair device for media leakage in external pressure expansion joints according to claim 1, characterized in that, The first sealing ring (2) includes a left sealing ring (21) and a right sealing ring (22). The left sealing ring (21) is disposed on the left cylinder (11), and the right sealing ring (22) is disposed on the right cylinder (12). The left sealing ring (21) and the right sealing ring (22) cooperate to cover and seal the end of the expansion joint (200).

9. The rapid emergency repair device for media leakage in external pressure expansion joints according to claim 1, characterized in that, A left connecting plate (111) is provided on the left cylinder (11), and a right connecting plate (121) is provided on the right cylinder (12). The left connecting plate (111) includes an upper left connecting plate (1111) and a lower left connecting plate (1112). The upper left connecting plate (1111) is located at the upper end of the left cylinder (11), and the lower left connecting plate (1112) is located at the lower end of the left cylinder (11). The right connecting plate (121) includes an upper right connecting plate (1211) and a lower right connecting plate (1212). The upper right connecting plate (1211) is located at the upper end of the right cylinder (12), and the lower right connecting plate (1212) is located at the lower end of the right cylinder (12). The upper left connecting plate (1111) and the upper right connecting plate (1211), and the lower left connecting plate (1112) and the lower right connecting plate (1212) are all connected together by bolts.

10. The rapid emergency repair device for media leakage in external pressure expansion joints according to claim 1, characterized in that, The left cylinder (11) and the left connecting plate (111), and the right cylinder (12) and the right connecting plate (121) are fixed together by welding.

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