Pipeline non-stop pressure inner and outer plugging device

Abstract

The application discloses a pipeline non-stop transmission belt pressure inner and outer plugging device, relates to the technical field of high-pressure pipeline plugging, and comprises an inner sealing unit, a plugging machine and an inner sealing assembly; the inner sealing assembly comprises a plugging head, the plugging head comprises a root, a tail, a root sealing ring and a tail sealing ring; an outer sealing unit comprises an outer shell arranged on the outer side of a pipeline, a feeding assembly and an outer sealing assembly; the outer sealing assembly comprises an anchoring piece, a wedge-shaped ring, a first sealing ring, a second sealing ring and a thrust separation ring. The extension part on the thrust separation ring simultaneously drives the first and second sealing rings, the compression strokes of the two sealing rings are consistent, the stress is balanced, unilateral sealing is prevented from being prematurely invalid, and the plugging reliability is remarkably improved. Meanwhile, the first sealing ring drives the wedge-shaped ring when being compressed, and then drives the anchoring piece to be radially tightly clamped to the pipe wall, the anchoring and plugging are synchronously completed, step-by-step operation is not needed, and the underwater operation process is simplified.

Description

Technical Field

[0001] This invention relates to high-pressure pipeline plugging technology, and in particular to a pipeline plugging device that operates under pressure without interrupting pipeline transmission. Background Technology

[0002] Pipeline plugging under pressure without interrupting normal pipeline transport is a key method for repairing damaged pipeline sections. In subsea pipeline maintenance, due to the high pressure, corrosiveness, and complex currents of the deep-sea environment, plugging devices typically employ a double rubber ring structure to achieve reliable sealing.

[0003] However, existing sealing devices typically use double rubber rings arranged in series. Due to installation limitations, the tightening force can only be applied from the outer ring, causing it to be subjected to significant compression deformation, making it prone to damage. Meanwhile, the inner ring cannot guarantee a complete seal. This arrangement results in inconsistent axial compression and contact stress distribution between the two sealing rings. Furthermore, in actual sealing conditions, the sealing ring closer to the medium bears the main transport pressure, while the sealing ring further away from the medium experiences relatively less stress. Under high-pressure fluctuations or impact conditions, the inner sealing ring is prone to early fatigue failure, easily leading to leakage, while the outer sealing ring is at risk of deformation and damage, making it difficult to maintain effective sealing independently. As pressure fluctuations intensify, the problem of uneven stress becomes even more pronounced, easily causing unilateral seal failure, making it difficult to guarantee overall sealing reliability. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is: the problem of uneven stress in the existing double-seal structure of high-pressure pipelines.

[0005] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a pipeline pressurized internal and external sealing device that does not interrupt pipeline transportation, including an internal sealing unit, including a sealing machine and an internal sealing assembly; the internal sealing assembly includes a sealing head, and the sealing head includes a root, a tail, a root sealing ring and a tail sealing ring;

[0006] The outer sealing unit includes a housing fitted over the outside of the pipe, a feed assembly connected to the axial end of the housing, and an outer sealing assembly disposed inside the housing; the outer sealing assembly includes an anchor, a wedge ring, a first sealing ring, a second sealing ring, and a thrust spacer ring;

[0007] The thrust spacer ring is provided with an extension portion, which passes through the second sealing ring and contacts the first sealing ring;

[0008] The movement of the tail section towards the root section can simultaneously drive the root sealing ring and the tail sealing ring to compress; and the axial inward movement of the thrust spacer can simultaneously drive the second sealing ring and the first sealing ring to compress, thereby achieving sealing inside and outside the pipeline.

[0009] In a preferred embodiment of the pipeline non-stop pressurized internal and external sealing device of the present invention: a second spacer ring group is provided between the second sealing ring and the first sealing ring;

[0010] The second spacer group includes a fixed spacer adjacent to the second sealing ring and a movable spacer adjacent to the first sealing ring.

[0011] In a preferred embodiment of the pipeline non-stop pressurized internal and external sealing device of the present invention: the thrust spacer ring is provided with an extension portion protruding around its circumference;

[0012] The second sealing ring and the fixed spacer are respectively provided with notches for the extension to pass through, and the extension contacts the movable spacer after passing through the notches.

[0013] In a preferred embodiment of the pipeline non-stop pressurized internal and external sealing device of the present invention: when the thrust spacer moves axially inward, the thrust spacer squeezes the second sealing ring, and at the same time pushes the second spacer group to squeeze the first sealing ring through the extension.

[0014] In a preferred embodiment of the pipeline non-stop pressurized internal and external sealing device of the present invention: the anchoring element is a clip, which is installed in the inner cavity of the outer shell through a positioning element.

[0015] In a preferred embodiment of the pipeline pressurized internal and external sealing device of the present invention: the outer shell includes an upper half tee and a lower half tee, and a sealing area is formed between the mating surfaces of the two; the sealing area is connected to the outer sealing components on both sides.

[0016] In a preferred embodiment of the pipeline non-stop pressurized internal and external sealing device of the present invention: the feeding component includes an end cap and a driving component connected between the end cap and the outer shell, and the end cap is in contact with the thrust spacer ring.

[0017] In a preferred embodiment of the pipeline non-stop pressurized internal and external sealing device of the present invention: the sealing head further includes a hydraulic rod connected between the root and the tail;

[0018] The sealing head is hinged to one side of the connecting plate.

[0019] In a preferred embodiment of the pipeline non-stop pressurized internal and external sealing device of the present invention: a sleeve is provided at the tail end, and a first spacer ring group is provided between the root sealing ring and the tail sealing ring;

[0020] When the hydraulic rod drives the tail section to move towards the root section, the tail section squeezes the tail seal ring, while the sleeve pushes the first spacer ring group to squeeze the root seal ring.

[0021] In a preferred embodiment of the pipeline non-stop pressurized internal and external sealing device of the present invention: it further includes a connecting unit, the connecting unit including a clamp valve and a branch pipeline, the clamp valve being connected between the outer shell and the branch pipeline.

[0022] The beneficial effects of this invention are as follows: A thrust spacer and an extension are provided in the outer sealing unit. The extension passes through the second sealing ring and contacts the movable spacer, allowing the thrust spacer to simultaneously drive the compression of both the second and first sealing rings as it moves axially inward. This ensures that the compression strokes of the second and first sealing rings are consistent, thereby guaranteeing a balance in compression and contact stress. This avoids the problem of uneven force distribution in traditional series-type double-sealing ring sealing, effectively preventing premature fatigue failure of one-sided seals and significantly improving sealing reliability. Furthermore, the compression force of the first sealing ring drives the wedge ring, which in turn drives the anchoring element to move radially and bite the outer wall of the pipe. This allows the anchoring of the anchoring element and the sealing action of the first sealing ring to be completed synchronously, eliminating the need for step-by-step operations and greatly simplifying the workflow. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0024] Figure 1 A schematic diagram of the overall structure of the pipeline pressurized internal and external sealing device of the present invention is shown;

[0025] Figure 2 An exploded view of the outer enclosure unit structure of the present invention is shown;

[0026] Figure 3 A partial exploded view of the outer enclosure unit structure of the present invention is shown;

[0027] Figure 4 A cross-sectional schematic diagram of the inner sealing unit sealing pipe structure of the present invention is shown;

[0028] Figure 5 An exploded view of the inner enclosure unit structure of the present invention is shown;

[0029] Figure 6 A full cross-sectional schematic diagram of the inner sealing unit structure of the present invention is shown.

[0030] In the diagram: 1. Inner sealing unit; 2. Outer sealing unit; 3. Connecting unit; 11. Sealing machine; 12. Inner sealing assembly; 13. Sleeve; 14. First spacer ring assembly; 21. Outer shell; 22. Feed assembly; 23. Outer sealing assembly; 24. Notch; 31. Clamp valve; 32. Branch pipeline; 121. Sealing head; 122. Connecting plate; 211. Upper half tee; 212. Lower half tee; 213. Sealing area; 221. End cap; 222. Driving component; 231. Anchoring component; 232. Wedge ring; 233. First sealing ring; 234. Second sealing ring; 235. Thrust spacer ring; 236. Second spacer ring assembly; 1211. Root; 1212. Tail; 1213. Root sealing ring; 1214. Tail sealing ring; 1215. Hydraulic rod; 2311. Positioning component; 2351. Extension; 2361. Fixed spacer ring; 2362. Movable spacer ring. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0032] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of the invention.

[0033] Reference Figures 1-3 This embodiment provides a pipeline uninterrupted pressurized internal and external sealing device, including an internal sealing unit 1, which includes a sealing machine 11 and an internal sealing assembly 12; the internal sealing assembly 12 includes a sealing head 121, which includes a root 1211, a tail 1212, a root sealing ring 1213 and a tail sealing ring 1214.

[0034] The outer sealing unit 2 includes a housing 21 sleeved on the outside of the pipe, a feed assembly 22 connected to the axial end of the housing 21, and an outer sealing assembly 23 disposed inside the housing 21; the outer sealing assembly 23 includes an anchor 231, a wedge ring 232, a first sealing ring 233, a second sealing ring 234, and a thrust spacer 235.

[0035] The thrust spacer 235 is provided with an extension 2351, which passes through the second sealing ring 234 and contacts the first sealing ring 233.

[0036] The movement of the tail section 1212 toward the root section 1211 can simultaneously drive the root sealing ring 1213 and the tail sealing ring 1214 to compress; and the movement of the thrust spacer 235 toward the axial interior can simultaneously drive the second sealing ring 234 and the first sealing ring 233 to compress, thereby achieving sealing inside and outside the pipeline.

[0037] Furthermore, a second spacer ring group 236 is provided between the second sealing ring 234 and the first sealing ring 233;

[0038] The second spacer group 236 includes a fixed spacer 2361 adjacent to the second sealing ring 234 and a movable spacer 2362 adjacent to the first sealing ring 233.

[0039] Furthermore, the thrust spacer 235 has an extension 2351 protruding from its circumference;

[0040] The second sealing ring 234 and the fixed spacer ring 2361 are respectively provided with notches 24 for the extension 2351 to pass through. After the extension 2351 passes through the notch 24, it comes into contact with the movable spacer ring 2362.

[0041] Furthermore, when the thrust spacer 235 moves axially inward, the thrust spacer 235 compresses the second sealing ring 234, and at the same time pushes the second spacer group 236 to compress the first sealing ring 233 through the extension 2351.

[0042] Furthermore, the anchor 231 is a clasp and is installed in the inner cavity of the housing 21 via the positioning element 2311.

[0043] Furthermore, the feed assembly 22 includes an end cap 221 and a drive member 222 connected between the end cap 221 and the housing 21, with the end cap 221 in contact with the thrust spacer 235.

[0044] In this embodiment, as Figure 1 As shown in the figure, this embodiment provides a pipeline pressurized internal and external sealing device that does not interrupt pipeline operation, including an inner sealing unit 1 and an outer sealing unit 2. The outer sealing unit 2 is used to be sleeved on the outside of the pipeline to achieve pipeline anchoring and external sealing.

[0045] like Figure 2 , Figure 3As shown, the outer sealing unit 2 includes a pair of half-connected outer shells 21, two sets of feed assemblies 22, and two sets of outer sealing assemblies 23. The outer shell 21 is fitted onto the outside of the pipe area to be sealed, and the interior of the outer shell 21 forms a receiving space. The two sets of feed assemblies 22 are respectively connected to the axial ends of the outer shell 21 to provide driving force. The two sets of outer sealing assemblies 23 are respectively slidably embedded inside the axial ends of the outer shell 21 to perform anchoring and sealing actions. The outer sealing assembly 23 is provided axially with an anchoring element 231, a wedge ring 232, a first sealing ring 233, a second spacer ring group 236, a second sealing ring 234, and a thrust spacer ring 235. Among them, the anchoring element 231 and the thrust spacer ring 235 are respectively slidably embedded inside the axial ends of the outer shell 21. The anchoring element 231 is installed on the innermost side inside the outer shell 21, and the thrust spacer ring 235 is located at the end of the outer shell 21 away from the anchoring element 231.

[0046] Preferably, the anchor 231 is a slip, and its inner wall has a toothed structure for engaging the pipe. The anchor 231 is installed in the inner cavity of the housing 21 by a positioning element 2311, which is a guide pin or guide rail, allowing the anchor 231 to move radially while restricting its circumferential rotation. The anchor 231 has a right-angled trapezoidal cross-section, while the wedge ring 232 has a triangular cross-section. Both have chamfered edges, and the major diameters of the anchor 231 and the wedge ring 232 are the same as the inner diameter of the housing 21. The inclined surfaces of the anchor 231 and the wedge ring 232 are in contact. The wedge ring 232 is slidably disposed between the anchor 231 and the first sealing ring 233, and the right-angled side of the wedge ring 232 is in contact with one side of the first sealing ring 233. The side of the first sealing ring 233 away from the wedge ring 232 is in contact with the second spacer ring group 236, and the side of the second spacer ring group 236 away from the first sealing ring 233 is in contact with the second sealing ring 234; the thrust spacer ring 235 is in contact with the second sealing ring 234, and at the same time, the thrust spacer ring 235 is in contact with the support surface of the end cover 221.

[0047] Preferably, both the first sealing ring 233 and the second sealing ring 234 are annular elastic sealing rings made of fluororubber material, which have good high pressure resistance and corrosion resistance.

[0048] Preferably, a second spacer group 236 is provided between the first sealing ring 233 and the second sealing ring 234. The second spacer group 236 consists of a fixed spacer ring 2361 and a movable spacer ring 2362. The movable spacer ring 2362 is disposed adjacent to the first sealing ring 233, and the fixed spacer ring 2361 is disposed adjacent to the second sealing ring 234, with the fixed spacer ring 2361 and the movable spacer ring 2362 being adjacent to each other. Furthermore, a thrust spacer ring 235 has a circumferentially arrayed extension 2351 protruding towards the second sealing ring 234, and notches 24 matching the extensions 2351 are formed on the fixed spacer ring 2361 and the second sealing ring 234. The extensions 2351 pass through the notches 24 between the fixed spacer ring 2361 and the second sealing ring 234, thereby contacting the movable spacer ring 2362. The movable spacer ring 2362 and the first sealing ring 233 are circular rings, and the movable spacer ring 2362 can act evenly on one side of the end face of the first sealing ring 233.

[0049] When the thrust spacer 235 moves axially inward, on the one hand, the sidewall of the thrust spacer 235 directly compresses the second sealing ring 234; on the other hand, the extension 2351 passes through the notch 24 of the second sealing ring 234 and the fixed spacer 2361, directly pushing the movable spacer 2362 towards the first sealing ring 233, thereby compressing the first sealing ring 233. At this time, the fixed spacer 2361 provides fixed support for the second sealing ring 234, allowing the second sealing ring 234 to expand radially under the compression of the thrust spacer 235, so that the second sealing ring 234 is completely sealed and compressed inside the thrust spacer 235; at the same time, the movable spacer 2362 is pushed by the extension 2351, resulting in relative displacement, and the fixed spacer 2361 and the movable spacer 2362 gradually separate from the initial tight state, and the movable spacer 2362 directly compresses the first sealing ring 233, causing the first sealing ring 233 to expand radially.

[0050] Furthermore, all outer sealing components 23 are annular parts, with the thrust spacer 235 contacting the end cap 221. The feed assembly 22 includes an end cap 221 and a drive member 222. The end cap 221 is an annular structure, fitted onto the outside of the pipe, and contacts the side of the thrust spacer 235 opposite to the second sealing ring 234. The drive member 222 connects the end cap 221 and the outer shell 21, and is used to drive the end cap 221 to move axially inward.

[0051] Preferably, the drive component 222 includes a thrust bolt and a thrust nut. One end of the thrust bolt is connected to the flange of the housing 21, and the other end passes through a through hole in the end cover 221 and is threaded into the thrust nut. Rotating the thrust nut can drive the end cover 221 to move axially. The drive component 222 can also be hydraulically driven, gear and rack driven, wedge driven, or ball screw driven, etc.

[0052] In the initial state, the outer sealing unit 2 is fitted onto the pipe to be sealed, with the upper tee 211 and lower tee 212 closed and fixed. During the outer sealing operation, the feed assembly 22 is operated, driving the end cap 221 to move axially inward. The end cap 221 pushes the thrust spacer 235 to move axially inward. The movement of the thrust spacer 235 generates driving forces in two directions:

[0053] Firstly, the thrust spacer 235 directly compresses the second sealing ring 234, causing the second sealing ring 234 to be compressed axially and expanded radially, tightly fitting against the outer wall of the pipe to form the first external seal.

[0054] Secondly, the thrust shim 235 pushes the movable shim 2362 to move axially inward through the extension 2351. The movable shim 2362 then squeezes the first sealing ring 233, causing the first sealing ring 233 to be compressed axially and expanded radially, tightly fitting against the outer wall of the pipe to form a second external seal.

[0055] Since the first sealing ring 233 and the second sealing ring 234 are driven by the same thrust spacer 235, and the driving force is transmitted synchronously through the extension 2351, the axial compression strokes of the first sealing ring 233 and the second sealing ring 234 are consistent, and the compression amount and contact stress are balanced, avoiding the problem of uneven force distribution in traditional series double-sealing structures. Simultaneously, the first sealing ring 233 expands along the inner side of the outer casing 21 during compression, pushing the wedge ring 232 to move axially inward. The inclined surface of the wedge ring 232 slides relative to the inclined surface of the anchor 231, converting the axial movement of the wedge ring 232 into the radial movement of the anchor 231, driving the anchor 231 to expand towards the outer side of the outer casing 21, gripping the outer wall of the pipe, and achieving mechanical anchoring.

[0056] Thus, through a single drive of the feed component 22, the outer sealing unit 2 simultaneously completes the compression and mechanical anchoring of the two sealing rings, achieving the effect of simultaneous anchoring and sealing.

[0057] Reference Figures 4-6 As an optional embodiment, in one embodiment provided by the present invention, the sealing head 121 further includes a hydraulic rod 1215 connected between the root 1211 and the tail 1212;

[0058] The plugging head 121 is hinged to one side of the connecting plate 122.

[0059] Furthermore, the tail section 1212 is provided with a sleeve 13, and a first spacer ring group 14 is provided between the root sealing ring 1213 and the tail sealing ring 1214.

[0060] When the hydraulic rod 1215 drives the tail 1212 to move towards the root 1211, the tail 1212 squeezes the tail sealing ring 1214, and at the same time the sleeve 13 pushes the first spacer ring group 14 to squeeze the root sealing ring 1213.

[0061] In this embodiment, as Figure 4 As shown, the inner sealing unit 1 is used to extend into the pipeline to achieve a seal inside the pipeline. The inner sealing unit 1 includes a sealing machine 11 and an inner sealing assembly 12. The sealing machine 11 is located outside the pipeline and is used to provide hydraulic power. In use, a connecting plate 122 is connected to the sealing machine 11, and the connecting plate 122 has a hydraulic oil passage inside. The inner sealing assembly 12 is connected to the connecting plate 122 via a hinge. The inner sealing assembly 12 can be folded or unfolded under the drive of the sealing machine 11, facilitating entry into the pipeline through the opening.

[0062] The inner sealing assembly 12 includes a sealing head 121, which has a root 1211, a tail 1212, a root sealing ring 1213, and a tail sealing ring 1214. The root 1211 is connected to the connecting plate 122 via a hinge, and the tail 1212 is axially movable relative to the root 1211.

[0063] Preferably, a sleeve 13 with a smaller diameter is provided at the end of the tail portion 1212 near the root portion 1211. The root sealing ring 1213 is fitted onto the outside of the root portion 1211 and is disposed adjacent to the hinge end of the root portion 1211; the tail sealing ring 1214 is fitted onto the outside of the sleeve 13 of the tail portion 1212. A first spacer ring assembly 14 is provided between the root sealing ring 1213 and the tail sealing ring 1214. The first spacer ring assembly 14 is fitted onto the outside of the sleeve 13 of the root portion 1211 and can slide axially.

[0064] The first spacer group 14 and the second spacer group 236 have the same function and are both composed of a fixed spacer 2361 and a movable spacer 2362. The first spacer group 14 also ensures that the forces acting on the root sealing ring 1213 and the tail sealing ring 1214 are consistent. The fixed spacer 2361 is located on the side of the tail sealing ring 1214 away from the tail 1212, while the sleeve 13 passes through the fixed spacer 2361 and the tail sealing ring 1214 and directly contacts the movable spacer 2362; the movable spacer 2362 is located on the side of the root sealing ring 1213 away from the root 1211.

[0065] Preferably, both the root sealing ring 1213 and the tail sealing ring 1214 are annular elastomers, preferably made of fluororubber material, which has good high pressure resistance and corrosion resistance.

[0066] The sealing head 121 also includes a hydraulic rod 1215, which is connected between the root 1211 and the tail 1212. The hydraulic rod 1215 is connected to the hydraulic system of the sealing machine 11 and controls the axial movement of the tail 1212 by hydraulic drive.

[0067] When the hydraulic rod 1215 retracts, the tail 1212 begins to move toward the root 1211, and the tail 1212 squeezes the tail sealing ring 1214. Meanwhile, the sleeve 13 passes through the fixed spacer ring 2361 and the tail sealing ring 1214, directly pushing the movable spacer ring 2362 of the first spacer ring group 14 to move, thereby squeezing the root sealing ring 1213, achieving the same function as the second spacer ring group 236.

[0068] In the initial state, the inner sealing component 12 is in a folded state and is inserted into the pipe through a hole opened by the hole opener. When the sealing head 121 moves to the designated sealing position, the hydraulic system of the sealing machine 11 is activated to supply oil to the hydraulic rod 1215.

[0069] The hydraulic rod 1215 drives the tail section 1212 to move axially towards the root section 1211. The movement of the tail section 1212 generates driving forces in two directions:

[0070] Firstly, the tail section 1212 directly squeezes the adjacent tail sealing ring 1214, causing the tail sealing ring 1214 to be axially compressed and radially expanded between the tail section 1212 and the fixed spacer 2361 of the first spacer group 14, tightly fitting against the inner wall of the pipe to form the first internal seal.

[0071] Secondly, the tail 1212 pushes the movable spacer 2362 of the first spacer group 14 towards the root 1211 through the sleeve 13. The movable spacer 2362 of the first spacer group 14 then squeezes the root sealing ring 1213, so that the root sealing ring 1213 is axially compressed and radially expanded between the root 1211 and the movable spacer 2362 of the first spacer group 14, and tightly fits against the inner wall of the pipe to form a second internal seal.

[0072] Since the root sealing ring 1213 and the tail sealing ring 1214 are driven by the same hydraulic rod 1215, and the driving force is transmitted synchronously through the sleeve 13 and the first spacer ring group 14, the axial compression stroke of the two sealing rings is consistent, and the compression amount and contact stress are balanced, thus avoiding the problem of uneven force in the traditional double-sealing structure.

[0073] When the seal needs to be released, the sealing machine 11 controls the hydraulic rod 1215 to reverse, driving the tail section 1212 to move away from the root section 1211. The tail section 1212 disengages from the compression of the tail sealing ring 1214, and at the same time, the sleeve 13 disengages from pushing the first spacer ring assembly 14. The root sealing ring 1213 and the tail sealing ring 1214 return to their original shape due to their own elasticity, releasing the seal on the inner wall of the pipeline. Then, the sealing machine 11 retracts the inner sealing assembly 12 into the connecting plate 122 and closes the clamp valve 31, thus completing the release of the inner seal.

[0074] Reference Figure 1 and Figure 2 as well as Figure 4 As an optional embodiment, in one embodiment provided by the present invention, the outer shell 21 includes an upper half tee 211 and a lower half tee 212, and a sealing area 213 is formed between the mating surfaces of the two; the sealing area 213 is connected to the outer sealing components 23 on both sides.

[0075] Furthermore, it also includes a connection unit 3, which includes a clamp valve 31 and a branch pipe 32. The clamp valve 31 is connected between the outer casing 21 and the branch pipe 32.

[0076] In this embodiment, as Figure 2 , Figure 3 As shown, the outer casing 21 includes an upper tee 211 and a lower tee 212. Both the upper tee 211 and the lower tee 212 are semi-cylindrical structures, which, when joined together, form a complete annular shell that is fitted onto the outside of the pipe. Flanges are provided on both axial sides of the upper tee 211 and the lower tee 212 for connecting the feed assembly 22.

[0077] The axial mating surfaces of the upper tee 211 and the lower tee 212 are precision-machined planes, with sealing grooves on both sides forming sealing areas 213. The sealing areas 213 extend axially, with their ends contacting the outer sealing components 23 on both sides. After the two sets of outer sealing components 23 complete compression sealing, the enclosed space between the two sets of outer sealing components 23 forms the sealing area 213, thereby encasing the damaged pipe within it.

[0078] The upper tee 211 has a branch flange at its top for connecting unit 3. The branch flange is integrally formed or welded to the upper tee 211, and the internal channel of the branch flange is connected to the internal space of the outer shell 21.

[0079] like Figure 1 , Figure 2 as well as Figure 4 As shown, the connection unit 3 includes a clamp valve 31 and a branch pipeline 32. The lower end of the clamp valve 31 is connected to the branch flange of the upper tee 211 via a flange, and a metal sealing ring is provided between the connection surfaces to withstand the medium pressure in the high-pressure environment of the seabed.

[0080] The upper end of the clamp valve 31 is connected to the branch pipeline 32 via a flange. The branch pipeline 32 is a prefabricated pipeline assembly. The end of the branch pipeline 32 away from the clamp valve 31 is connected to the plugging device connection box of the plugging machine 11, forming a complete medium bypass channel. The clamp valve 31 is used to control the opening and closing of the branch channel, and can be opened or closed as needed during the opening operation and internal plugging operation.

[0081] Before carrying out pipeline maintenance work, first, the upper half tee 211 and the lower half tee 212 are fitted onto the pipeline to be sealed and fastened with bolt and nut assemblies. Then, the clamp valve 31 is installed on the branch flange of the upper half tee 211 through the flange, and the branch pipeline 32 is connected to the clamp valve 31 and the sealing machine 11.

[0082] After the outer sealing component 23 completes the sealing, the clamp valve 31 is opened. After drilling holes using an external hole punch, the inner sealing component 12 is placed inside the pipe to complete the internal and external sealing. Finally, the medium in the pipe sequentially passes through the internal channel of the upper tee 211, the clamp valve 31, and the branch pipe 32 into the sealing device connection box, ultimately flowing to the external pipe or maintenance bypass, achieving bypass transmission of the medium. At this point, the medium in the pipe section to be repaired is completely isolated, allowing for repair or replacement work.

[0083] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A pipeline uninterrupted pressurized internal and external sealing device, characterized in that: The inner sealing unit (1) includes a sealing machine (11) and an inner sealing assembly (12); the inner sealing assembly (12) includes a sealing head (121), the sealing head (121) including a root (1211), a tail (1212), a root sealing ring (1213), and a tail sealing ring (1214) nested together. The outer sealing unit (2) includes a housing (21) sleeved on the outside of the pipe, a feed assembly (22) connected to the axial end of the housing (21), and an outer sealing assembly (23) disposed inside the housing (21); the outer sealing assembly (23) includes an anchor (231), a wedge ring (232), a first sealing ring (233), a second sealing ring (234), and a thrust spacer (235) nested in sequence. The thrust spacer (235) is provided with an extension (2351), which passes through the second sealing ring (234) and contacts the first sealing ring (233); The movement of the tail (1212) toward the root (1211) can simultaneously drive the root sealing ring (1213) and the tail sealing ring (1214) to compress; the movement of the thrust spacer (235) axially toward the inside can simultaneously drive the second sealing ring (234) and the first sealing ring (233) to compress, thereby achieving sealing inside and outside the pipeline; A second spacer group (236) is provided between the second sealing ring (234) and the first sealing ring (233); The second spacer group (236) includes a fixed spacer (2361) adjacent to the second sealing ring (234) and a movable spacer (2362) adjacent to the first sealing ring (233). The thrust spacer (235) has an extension (2351) protruding on its circumference. The second sealing ring (234) and the fixed spacer (2361) are respectively provided with notches (24) for the extension (2351) to pass through. After the extension (2351) passes through the notch (24), it contacts the movable spacer (2362). When the thrust spacer (235) moves axially inward, the thrust spacer (235) squeezes the second sealing ring (234), and at the same time pushes the second spacer group (236) to squeeze the first sealing ring (233) through the extension (2351).

2. The pipeline pressurized internal and external sealing device according to claim 1, characterized in that: The anchor (231) is a clasp and is installed in the inner cavity of the outer shell (21) by the positioning element (2311).

3. A pipeline pressurized internal and external sealing device according to claim 1 or 2, characterized in that: The outer casing (21) includes an upper half tee (211) and a lower half tee (212), and a sealing area (213) is formed between the mating surfaces of the two; the sealing area (213) is connected to the outer sealing components (23) on both sides.

4. The pipeline pressurized internal and external sealing device according to claim 3, characterized in that: The feed assembly (22) includes an end cap (221) and a drive (222) connected between the end cap (221) and the housing (21), the end cap (221) being in contact with the thrust spacer (235).

5. The pipeline pressurized internal and external sealing device according to claim 1, characterized in that: The sealing head (121) also includes a hydraulic rod (1215) connected between the root (1211) and the tail (1212). The sealing head (121) is hinged to one side of the connecting plate (122).

6. The pipeline pressurized internal and external sealing device according to claim 5, characterized in that: The tail (1212) is provided with a sleeve (13), and a first spacer ring group (14) is provided between the root sealing ring (1213) and the tail sealing ring (1214). When the hydraulic rod (1215) drives the tail (1212) to move toward the root (1211), the tail (1212) squeezes the tail sealing ring (1214), and at the same time the sleeve (13) pushes the first spacer group (14) to squeeze the root sealing ring (1213).

7. A pipeline uninterrupted pressurized internal and external sealing device according to claim 3, characterized in that: It also includes a connection unit (3), which includes a clamp valve (31) and a branch pipeline (32), wherein the clamp valve (31) is connected between the outer shell (21) and the branch pipeline (32).

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