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, it includes: barrel, barrel includes the left barrel and right barrel of same structure, left barrel is connected with right barrel cooperation, for the end of expansion joint on pipeline is covered and sealed;Sealing ring is provided on barrel, sealing ring is used for the sealing between barrel and expansion joint;Pipe valve assembly is provided on barrel, for discharging high-pressure medium in barrel;It further includes front stop and rear stop, front stop is set on the outer tube of expansion joint, located in the front side of barrel, rear stop is set on pipeline, located in the back side of barrel, front stop cooperates with rear stop, for limiting barrel;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 at the end of the expansion joint, 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 at the end of the external pressure expansion joint 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 sealing ring is provided on the left 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 is provided on the cylinder for discharging high-pressure media inside the cylinder; and a stop block, comprising a front stop block and a rear stop block, the front stop block being disposed on the outer pipe of the expansion joint at the front of the cylinder, and the rear stop block being disposed on the pipeline at the rear of the cylinder, the front stop block and the rear stop block cooperating to limit the movement of the cylinder.

[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, multiple front stops are evenly arranged around the outer tube, and the front stops are connected to the outer tube by welding; multiple rear stops are evenly arranged around the pipe, and the rear stops are connected to the pipe by welding.

[0010] 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.

[0011] Furthermore, the left cylinder and the left connecting plate, and the right cylinder and the right connecting plate, are fixed together by welding.

[0012] Furthermore, the left cylinder and the left connecting plate, and the right cylinder and the right connecting plate, are integrally formed.

[0013] Furthermore, both the left and right cylinders are semi-circular ring structures.

[0014] Furthermore, there are 2-4 front and rear stops.

[0015] 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:

[0016] 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.

[0017] 2) The left and right cylinders are connected separately by two pairs of connecting plates, which can be quickly assembled without on-site welding. Workers can directly put the two cylinders on the outer pipe of the expansion joint and the pipeline, and complete the installation by tightening the bolts. Compared with the traditional welding method, the construction time can be greatly shortened, which meets the needs of "rapid response". Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the emergency repair device described in an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the right-middle cylinder;

[0020] Figure 3 This is a schematic diagram of the installation structure of the emergency repair device in Embodiment 1 of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 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. Sealing ring; 21. Left sealing ring; 22. Right sealing ring; 221. First half-ring sealing ring; 222. Upper right sealing ring; 223. Second half-ring sealing ring; 224. Lower right sealing ring; 3. Pipeline valve assembly; 4. Stop block; 41. Front stop block; 42. Rear stop block; 5. Sealing sleeve; 51. First sealing sleeve; 52. Second sealing sleeve; 100. Pipeline; 200. Expansion joint; 201. Outer pipe. Detailed Implementation

[0023] 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.

[0024] Example 1

[0025] like Figure 1-3As shown, this embodiment provides a rapid emergency repair device suitable for media leakage in external pressure expansion joints, comprising: a cylinder 1, which includes 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 sealing ring 2 is provided on the cylinder 11 for sealing between the cylinder 1 and the outer pipe 201 of the expansion joint 200, and between the cylinder 1 and the pipeline 100; a pipe valve assembly 3 is provided on the cylinder 1 for discharging high-pressure media inside the cylinder 1; and a stop block 4, which includes a front stop block 41 and a rear stop block 42, the front stop block 41 being disposed on the outer pipe 201 of the expansion joint 200 and located on the front side of the cylinder 1, and the rear stop block 42 being disposed on the pipeline 100 and located on the rear side of the cylinder 1, the front stop block 41 and the rear stop block 42 cooperating to limit the movement of the cylinder 1.

[0026] In detail, after the left cylinder 11 and the right cylinder 12 are connected, they can tightly cover the end of the expansion joint 200 to form a closed sealing cavity, which confines the leaked medium inside the cylinder and prevents it from leaking directly to the outside, thus ensuring the safety of personnel and equipment. During installation, if the high-pressure medium leaking from the expansion joint 200 makes it difficult to connect the cylinder 1, the pipe valve assembly 3 can be opened to release the pressure inside the cylinder, which facilitates quick installation. After installation, the valve is closed to maintain the pressure balance of the sealing system and prevent medium leakage. By setting the front stop 41 and the rear stop 42, the axial displacement of the cylinder 1 under the medium pressure can be blocked.

[0027] This application can quickly and effectively isolate the leaking medium at the end of the external pressure expansion joint 200 from the outside world, providing a safe and reliable guarantee for emergency repair of the expansion joint 200. Moreover, the overall structure is simple, the installation is quick, and it is applicable to various types of expansion joints 200.

[0028] In detail, the cylinder 1 is an annular structure, while the left cylinder 11 and right cylinder 12 are both semi-circular annular structures. Compared to a fully annular structure, the semi-circular annular structure of the left and right cylinders eliminates the need for complete insertion from one end of the pipe during installation; instead, installation can be performed from both sides, reducing installation difficulty and time. In practical operation, when repairing expansion joints on already laid pipelines, this semi-circular annular structure allows for more flexible installation, avoiding difficulties caused by space constraints. Furthermore, the left and right cylinders can be connected by bolts, reducing on-site welding work compared to traditional welding methods, further improving installation efficiency and reducing construction difficulty.

[0029] Understandably, by setting a sealing ring 2 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 200, to prevent leakage of gas or liquid media.

[0030] When installing the emergency repair device, a large amount of high-pressure medium leaks at the expansion joint 200, which may cause installation difficulties. In this case, the pipe valve assembly 3 can be opened to release the pressure inside the cylinder 1, which facilitates the quick installation of the emergency repair device. After installation, the valve should be closed to prevent medium leakage.

[0031] Preferably, the sealing ring is made of a high-temperature resistant material to be suitable for high-temperature media.

[0032] 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.

[0033] Specifically, this design prevents the medium from escaping from both ends of the cylinder 1, thus improving the sealing performance.

[0034] In detail, the sealing sleeve 5 includes a first sealing sleeve 51 and a second sealing sleeve 52, wherein the first sealing sleeve 51 and the second sealing sleeve 52 cooperate to cover the pipe 100.

[0035] As a preferred example of this application, a plurality of front stops 41 are uniformly arranged around the outer tube 201, and the front stops 41 are connected to the outer tube 201 by welding; a plurality of rear stops 42 are uniformly arranged around the pipe 100, and the rear stops 42 are connected to the pipe 100 by welding.

[0036] Specifically, evenly distributing multiple baffles ensures that the thrust on the cylinder 1 is evenly distributed across the baffles, preventing damage to any single baffle due to excessive stress. Simultaneously, the welded connection creates a permanent rigid structure capable of withstanding the high-pressure thrust during expansion joint leakage. Compared to bolted connections, welded fixing distributes the load more evenly, making it particularly suitable for dynamic operating conditions involving frequent expansion and contraction of the expansion joint, and better adapting to the stress requirements under complex working conditions.

[0037] Preferably, there are 2-4 front stop blocks 41 and 42 rear stop blocks.

[0038] This design avoids material waste while ensuring sufficient support.

[0039] 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.

[0040] 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.

[0041] Understandably, this embodiment is applicable to emergency repairs of media leakage in the external pressure expansion joint 200. 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 avoid 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.

[0042] As a preferred example of this application, the 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.

[0043] 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.

[0044] In detail, the left sealing ring 21 and the right sealing ring 22 cooperate to seal 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 pipe 100; the right sealing ring 22 includes a first half-ring sealing ring 221, an upper right sealing ring 222, a second half-ring sealing ring 223, and a lower right sealing ring 224 connected in sequence, and the left sealing ring 21 includes a third half-ring sealing ring, an upper left sealing ring, a fourth half-ring sealing ring, and a lower left sealing ring connected in sequence. The left sealing ring 21 and the right sealing ring 22 have the same structure; when the cylinder 1 is installed... When the expansion joint 200 is in operation, the first semi-ring seal 221 and the third semi-ring seal cooperate to seal between the front end of the cylinder 1 and the outer pipe 201; the second semi-ring seal 223 and the fourth semi-ring seal cooperate to seal between the sealing sleeve 5 and the rear pipe 100 of the expansion joint 200; the upper right seal 222 and the upper left seal cooperate to seal between the upper left connecting plate 1111 and the upper right connecting plate 1211; and the lower right seal 224 and the lower left seal cooperate to seal between the lower left connecting plate 1112 and the lower right connecting plate 1212.

[0045] 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.

[0046] With an external pressure of 1.6 MPa and an effective area of ​​0.44 m², 2 Taking the 200 type external pressure axial expansion joint under high pressure conditions as an example:

[0047] According to the pressure thrust algorithm in GBT12777-2019, the pressure thrust can be obtained from formula (1) as 704kN.

[0048] (1)

[0049] Where P is the external pressure on the bellows, and A is the effective area of ​​the bellows.

[0050] The calculation method for the frictional force f between the emergency repair device and the expansion joint 200 is shown in formula (2).

[0051] (2)

[0052] Where F is the maximum preload of the bolt.

[0053] 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 needed to prevent displacement of cylinder 1. 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 movement of the rapid emergency repair device to ensure safety.

[0054] 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.

[0055] Specifically, the welded connection forms a permanent rigid structure that can withstand the thrust of the high-pressure medium when the expansion joint 200 leaks, and together with the sealing ring 2, it can achieve a "zero leakage" sealing effect.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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 200. When a leak occurs, the left and right cylinders 12 are fitted over the outer pipe 201 of the expansion joint 200 and the outlet pipe. 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 outer pipe 201 of the expansion joint 200 and the pipeline 100 via a sealing ring 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 strength between the rapid emergency repair device and the expansion joint 200 and pipeline 100 can be strengthened by increasing the number of bolts, using high-strength bolts, and installing a stop block 4 to prevent media leakage.

[0060] 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 cylindrical body (1) includes a left cylindrical body (11) and a right cylindrical body (12) with identical structures. The left cylindrical body (11) and the right cylindrical body (12) are connected to each other to cover and seal the end of the expansion joint (200) on the pipe (100). A sealing ring (2) is provided on the cylindrical body (1). The sealing ring (2) is used to seal the outer pipe (201) of the expansion joint (200) and the pipe (100). A connection is provided on the cylindrical body (1). The valve assembly (3) is used to discharge the high-pressure medium inside the cylinder (1); it also includes a stop block (4), which includes a front stop block (41) and a rear stop block (42). The front stop block (41) is set on the outer pipe (201) of the expansion joint (200) and located on the front side of the cylinder (1). The rear stop block (42) is set on the pipe (100) and located on the rear side of the cylinder (1). The front stop block (41) and the rear stop block (42) cooperate to limit the cylinder (1).

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 1, characterized in that, Multiple front stops (41) are evenly arranged around the outer tube (201), and the front stops (41) are connected to the outer tube (201) by welding; multiple rear stops (42) are evenly arranged around the pipe (100), and the rear stops (42) are connected to the pipe (100) by welding.

4. 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.

5. 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.

6. 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 integrally formed.

7. The rapid emergency repair device for media leakage in external pressure expansion joints according to claim 1, characterized in that, Both the left cylinder (11) and the right cylinder (12) are semi-circular ring structures.

8. The rapid emergency repair device for media leakage in external pressure expansion joints according to claim 1, characterized in that, The front stop (41) and the rear stop (42) are each 2-4 in number.

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