Temporary isolation device for oil and gas pipeline hot work

Abstract

The invention discloses a kind of temporary isolation device for oil and gas pipeline hot work, belonging to the technical field of oil and gas pipeline isolation, specifically, oil and gas pipeline assembly is installed between oil conveying port, and is used for conveying and transporting oil and gas by oil and gas pipeline assembly, isolation device is detachably installed in the inside of oil and gas pipeline assembly, and the outer wall of isolation device is in close contact with the inner wall of oil and gas pipeline assembly, and the natural gas at one end inside oil and gas pipeline assembly is sealed and blocked by isolation device, the liquid part of liquid cavity can be in close contact with the raised weld of the inner wall of oil and gas pipeline, so as to achieve the effect of extrusion sealing, the raised weld is wrapped, and the strength is generated because the two cavities become liquid, to resist the pressure of gas in pipeline.

Description

Technical Field

[0001] This invention relates to the field of oil and gas pipeline isolation technology, specifically a temporary isolation device for hot work on oil and gas pipelines. Background Technology

[0002] Oil and gas pipelines are pipeline systems used to transport oil and natural gas. These pipelines play a vital role in the oil and gas industry, mainly in the following aspects: Fluid transportation: Pipelines are an indispensable transportation tool in the oil and gas industry. They can efficiently transport fluid resources such as oil and natural gas directly from the production site to the consumption site, reducing losses and costs during transportation. Oilfield to refinery transportation: Crude oil pipelines play a crucial role in the petroleum industry by transporting crude oil from oilfields to refineries, meeting the production needs of refineries and ensuring a stable supply of crude oil. Environmental protection and safety: Pipeline transportation of oil and natural gas can greatly reduce the risk of leakage and pollution during transportation, improving environmental protection and safety. At the same time, pipeline transportation also reduces energy consumption and emissions during transportation. When existing oil and gas pipelines are replaced or rerouted, pipe breaks and re-welding are required. When welding to existing pipelines, leaked or residual oil and gas in the original pipelines can explode when exposed to the high heat of electric welding, destroying both the original and welded pipelines. Therefore, a temporary isolation device for oil and gas must be installed at the weld joint. The biggest obstacle to sealing the pipeline with this temporary isolation device is the protruding weld seam. General temporary sealing devices cannot achieve a seal due to the protrusion of the weld seam. Therefore, a new type of device must be developed. This new temporary isolation device must be able to cover the protruding weld seam and prevent oil and gas from leaking.

[0003] Therefore, we propose a temporary isolation device for hot work on oil and gas pipelines. Summary of the Invention

[0004] In view of the problems existing in the above and / or existing temporary isolation devices for hot work on oil and gas pipelines, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a temporary isolation device for hot work in oil and gas pipelines. By inserting the isolation device into the interior of the oil and gas pipeline assembly, and then using a limiting mechanism and a supporting mechanism to horizontally limit the position of the isolation device, and finally filling the isolation device with gas so that the liquid portion inside the gasbag wraps around the weld protrusion, the aforementioned existing problems can be solved.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: A temporary isolation device for hot work on oil and gas pipelines, comprising: An oil and gas pipeline assembly installed between oil transport ports; an isolation device detachably installed inside the oil and gas pipeline assembly, with its outer wall in close contact with the inner wall of the oil and gas pipeline assembly; a limiting mechanism installed on the left end of the outer wall of the isolation device, with the limiting mechanism in contact with the inner wall of the oil and gas pipeline assembly; and a support mechanism installed on the right end of the outer wall of the isolation device, with the support mechanism in contact with the inner wall of the oil and gas pipeline assembly.

[0007] As a preferred embodiment of the temporary isolation device for hot work on oil and gas pipelines according to the present invention, the oil and gas pipeline assembly includes: Oil and gas pipelines are installed between oil delivery ports; three-way valves are located at the top of the oil and gas pipelines.

[0008] As a preferred embodiment of the temporary isolation device for hot work on oil and gas pipelines according to the present invention, the isolation device includes: An isolation airbag is detachably installed inside an oil and gas pipeline and connected to an external inflation pump; an isolation assembly is located in the middle of the outer wall of the isolation airbag and its outer wall contacts the raised weld bead on the inner wall of the oil and gas pipeline.

[0009] As a preferred embodiment of the temporary isolation device for hot work on oil and gas pipelines according to the present invention, the isolation component includes: An external airbag is positioned in the middle of the outer wall of the isolation airbag, and its outer wall contacts the raised weld bead on the inner wall of the oil and gas pipeline; a groove is located at the left end of the outer wall of the external airbag; an I-shaped air chamber is located inside the external airbag, with its lower part configured as a liquid chamber and its upper part configured as an air chamber.

[0010] As a preferred embodiment of the temporary isolation device for hot work on oil and gas pipelines according to the present invention, the limiting mechanism includes: A connecting assembly is attached to the left end of the outer wall of the isolation airbag; a limiting assembly is installed on the outer wall of the connecting assembly and makes the outer wall of the limiting assembly contact the inner wall of the oil and gas pipeline; a retracting assembly has its right end slidably connected to the inside of the groove and its left end slidably connected to the top of the limiting assembly.

[0011] As a preferred embodiment of the temporary isolation device for hot work on oil and gas pipelines according to the present invention, the connecting assembly includes: A connecting sleeve is attached to the left end of the outer wall of the isolation airbag; a first bearing seat is located around the right end of the outer wall of the connecting sleeve; and a second bearing seat is located around the left end of the outer wall of the connecting sleeve.

[0012] As a preferred embodiment of the temporary isolation device for hot work on oil and gas pipelines according to the present invention, the limiting component includes: The system comprises several components: a limiting rod, the right end of which is rotatably connected to the inside of the first bearing seat; a drive groove, located at the top of the limiting rod, allowing the retracting assembly to slide within it; a guide groove, located at both ends of the inner wall of the drive groove, allowing it to slide against the left ends of the retracting assembly; a toothed groove, located on the surface of the drive groove, connecting to the drive end of the retracting assembly, and allowing the retracting assembly to move within the drive groove through its engagement with the drive end; a limiting wheel, located at the left end of the limiting rod, contacting the inner wall of the oil and gas pipeline; a receiving groove, located at the bottom of the limiting rod; a top rod, one end of which is rotatably connected to the inside of the second bearing seat, and the other end rotatably connected to the inside of the receiving groove; and a return spring, located on the outer wall of the top rod, with its left end connected to the left end of the top rod and its right end connected to the right end of the top rod.

[0013] As a preferred embodiment of the temporary isolation device for hot work on oil and gas pipelines according to the present invention, the retraction assembly includes: A retractable sleeve is slidably connected inside the groove, with its inner wall contacting the outer wall of the limiting rod; a beveled groove is located around the inner wall of the retractable sleeve, with its inner wall contacting the outer wall of the limiting rod; a flexible rubber ring is connected to the left end of the outer wall of the retractable sleeve, with its inner wall contacting the outer walls of several sets of limiting rods; an arc-shaped bracket is installed around the outer wall of the flexible rubber ring, with its left end inserted into the drive groove, and its two sides slidably connected to the guide groove; a side bracket is located at the middle of the front and rear ends of the arc-shaped bracket; a drive gear is rotatably connected inside the side bracket, meshing with the tooth groove; and a drive motor is mounted on one side of the outer wall of the arc-shaped bracket via a bracket, with the output end of the drive motor connected to one side port of the drive gear.

[0014] As a preferred embodiment of the temporary isolation device for hot work on oil and gas pipelines according to the present invention, the supporting mechanism includes: A conical connecting sleeve is installed on the right end of the outer wall of the isolation airbag; a drive assembly is installed on the right end of the conical connecting sleeve, and the outer wall of the drive assembly contacts the inner wall of the oil and gas pipeline; a sealing assembly is installed on the right end of the drive assembly, and the output end of the sealing assembly is connected to the upper right port of the drive assembly.

[0015] As a preferred embodiment of the temporary isolation device for hot work on oil and gas pipelines according to the present invention, the driving component includes: A limiting plate is installed at the right end of the conical connecting sleeve; a rotating plate is rotatably connected to the inner center of the limiting plate, and the surface of the rotating plate is provided with an arc groove around its perimeter; a limiting groove is provided around the right end of the outer wall of the limiting plate; a main gear is rotatably connected to the upper side of the left end of the outer wall of the limiting plate; a follower gear is installed at the left end of the rotating plate, and the outer wall of the follower gear meshes with the outer wall of the main gear, while the arc groove around the surface of the follower gear coincides with the arc groove around the surface of the rotating plate; a support rod is slidably connected inside the limiting groove, and the protrusion on the lower side of the left end of the outer wall of the support rod passes through the arc grooves around the surface of the follower gear and the surface of the rotating plate. The ball bearings are rolled around the outer wall of the support rod and make contact with the inner wall of the oil and gas pipeline. The sealing assembly includes: a sealing cover plate, which is installed at the right end of the limiting plate; and a rotary drive motor, which is located on the upper side of the rear end of the outer wall of the sealing cover plate, and the output end of the rotary drive motor is connected to the right port of the main gear.

[0016] Compared with existing technologies: By combining the limiting mechanism and the supporting mechanism, the isolation device inserted into the oil and gas pipeline assembly can be horizontally limited, so that the initial state of the isolation device is relatively horizontal, ensuring that the isolation assembly can contact the weld protrusion after the isolation device is inflated. By inflating the isolation airbag, it expands, causing the outer wall of the outer airbag to contact the inner wall of the oil and gas pipeline. This compresses the I-shaped air chamber inside the outer airbag, causing the liquid chamber, which was originally on the lower side, to fill the air chamber under continuous pressure. This allows the liquid portion of the liquid chamber to come into close contact with the raised weld bead on the inner wall of the oil and gas pipeline, achieving a compression and sealing effect. This effectively wraps around the raised weld bead, and the liquid in both chambers also provides strength, resisting the gas pressure inside the pipeline. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall main view structure provided by the present invention; Figure 2 This is a schematic diagram of the overall disassembled structure provided by the present invention; Figure 3 A schematic diagram showing the disassembled structure of the isolation device, limiting mechanism, and support mechanism provided by the present invention; Figure 4 This is a schematic diagram of the isolation device structure provided by the present invention; Figure 5This is a cross-sectional structural diagram of the isolation device provided by the present invention; Figure 6 This is a schematic diagram of the disassembled structure of the limiting mechanism provided by the present invention; Figure 7 This is a schematic diagram of the main structure of the limiting component provided by the present invention; Figure 8 This is a bottom view of the limiting component provided by the present invention; Figure 9 This is a schematic diagram of the folding component structure provided by the present invention; Figure 10 This is a schematic diagram of the arc-shaped support structure provided by the present invention; Figure 11 A schematic diagram of the disassembled support mechanism provided by the present invention; Figure 12 This is a schematic diagram of the main view structure of the driving component provided by the present invention; Figure 13 This is a schematic diagram of the right-side structure of the driving component provided by the present invention; Figure 14 This is a schematic diagram of the split structure of the drive assembly and sealing assembly provided by the present invention from the left view.

[0018] In the diagram: 1. Oil and gas pipeline assembly; 11. Oil and gas pipeline; 12. Three-way valve port; 2. Isolation device; 21. Isolation airbag; 22. Isolation component; 221. External airbag; 222. Groove; 223. I-shaped air chamber; 3. Limiting mechanism; 31. Connecting component; 311. Connecting sleeve; 312. First bearing seat; 313. Second bearing seat; 32. Limiting component; 321. Limiting rod; 322. Drive groove; 323. Guide groove; 324. Tooth groove; 325. Limiting wheel; 326. Receiving groove; 327. Top rod; 3 28. Return spring; 33. Retracting assembly; 331. Retracting sleeve; 332. Inclined groove; 333. Tough rubber ring; 334. Arc-shaped bracket; 335. Side bracket; 336. Drive gear; 337. Drive motor; 4. Support mechanism; 41. Conical connecting sleeve; 42. Drive assembly; 421. Limiting plate; 422. Rotary plate; 423. Limiting groove; 424. Main gear; 425. Follower gear; 426. Support rod; 427. Ball bearing; 43. Sealing assembly; 431. Sealing cover plate; 432. Rotary drive motor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0020] This invention provides a temporary isolation device for hot work on oil and gas pipelines. Please refer to [link / reference]. Figure 1-14It includes an oil and gas pipeline assembly 1, an isolation device 2, a limiting mechanism 3, and a support mechanism 4; Oil and gas pipeline assembly 1 is installed between oil delivery ports and is used for the transportation and transport of oil and gas. Oil and gas pipeline assembly 1 includes: oil and gas pipeline 11 and three-way valve 12. Oil and gas pipeline 11 is installed between oil delivery ports and is used for the transportation and transport of oil and gas. Three-way valve 12 is located at the top of oil and gas pipeline 11 and is used for connection with other pipelines.

[0021] An isolation device 2 is detachably installed inside the oil and gas pipeline assembly 1, with its outer wall in close contact with the inner wall of the oil and gas pipeline assembly 1. The isolation device 2 is used to seal and block natural gas at one end of the oil and gas pipeline assembly 1. The isolation device 2 includes: an isolation airbag 21, an isolation component 22, an outer airbag 221, a groove 222, and an I-shaped air chamber 223. The isolation airbag 21 is detachably installed inside the oil and gas pipeline 11, with an external inflation pump connected to it. The isolation airbag 21 is inserted into the oil and gas pipeline 11 through a three-way valve port 12. The isolation component 22 is located in the middle of the outer wall of the isolation airbag 21, with its outer wall in contact with a raised weld bead on the inner wall of the oil and gas pipeline 11. The expansion of the isolation airbag 21 allows the isolation component 22 to contact the inner wall of the oil and gas pipeline 11. The outer airbag 221 is positioned in the middle of the outer wall of the isolation airbag 21, and its outer wall contacts the raised weld of the inner wall of the oil and gas pipeline 11. As the isolation airbag 21 expands, the outer airbag 221 contacts the inner wall of the oil and gas pipeline 11. The groove 222 is located at the left end of the outer wall of the outer airbag 221, and the right end component of the limiting mechanism 3 can be placed through the groove 222. The I-shaped air cavity 223 is located inside the outer airbag 221, and its lower part is set as a liquid cavity and its upper part is set as an air cavity. When the I-shaped air cavity 223 squeezes the inner wall of the oil and gas pipeline 11, the liquid cavity will fill the air cavity under continuous pressure, so that the upper part of the liquid cavity is in close contact with the raised weld of the inner wall of the oil and gas pipeline 11, thereby achieving the effect of compression sealing.

[0022] The limiting mechanism 3 is installed on the left end of the outer wall of the isolation device 2, and contacts the inner wall of the oil and gas pipeline assembly 1. The limiting mechanism 3 provides limiting support for the left end of the isolation device 2 and also provides horizontal stability for the placement of the isolation device 2. The limiting mechanism 3 includes: a connecting assembly 31, a connecting sleeve 311, a first shaft seat 312, a second shaft seat 313, a limiting assembly 32, a limiting rod 321, a drive groove 322, a guide groove 323, a toothed groove 324, a limiting wheel 325, a receiving groove 326, a top rod 327, a return spring 328, a gathering assembly 33, a gathering sleeve 331, a sloped groove 332, a flexible rubber ring 333, an arc-shaped bracket 334, a side bracket 335, a drive gear 336, and... A drive motor 337 and a connecting assembly 31 are included. The connecting assembly 31 is connected to the left end of the outer wall of the isolation airbag 21 and can be used to install and connect the limiting assembly 32. A connecting sleeve 311 is connected to the left end of the outer wall of the isolation airbag 21 and can drive the isolation airbag 21 to limit its position. A first bearing 312 is disposed around the right end of the outer wall of the connecting sleeve 311. A second bearing 313 is disposed around the left end of the outer wall of the connecting sleeve 311. The limiting assembly 32 is installed on the outer wall of the connecting assembly 31, and its outer wall contacts the inner wall of the oil and gas pipeline 11. By expanding the limiting assembly 32, the positions of the connecting assembly 31 and the isolation airbag 21 can be horizontally limited. The left end of the isolation airbag 21 remains flat. A limiting rod 321, with its right end rotatably connected to the inside of the first bearing 312, is configured in several groups. A drive groove 322 is located at the top of the limiting rod 321, allowing the retractable assembly 33 to slide within it. A guide groove 323 is located at both ends of the inner wall of the drive groove 322, slidably connecting to the left ends of the retractable assembly 33. The guide groove 323 limits and guides the movement of the retractable assembly 33. A toothed groove 324 is located on the surface of the drive groove 322, connecting to the drive end of the retractable assembly 33. The toothed groove 324 engages with the drive end of the retractable assembly 33, allowing the retractable assembly 33 to move within the drive groove. The movement is within 322. A limiting wheel 325 is located at the left end of the limiting rod 321, contacting the inner wall of the oil and gas pipeline 11. A receiving groove 326 is located at the bottom of the limiting rod 321. A push rod 327 has one end rotatably connected to the inside of the second shaft seat 313 and the other end rotatably connected to the inside of the receiving groove 326, allowing the push rod 327 to be stored within it. A return spring 328 is located on the outer wall of the push rod 327, with its left end connected to the left end of the push rod 327 and its right end connected to the right end of the push rod 327. Through the cooperation of the return spring 328 and the push rod 327, several sets of limiting rods 321 can be lifted.The limiting wheel 325 of the limiting rod 321 is always in contact with the inner wall of the oil and gas pipeline 11, thereby achieving the supporting and limiting of the limiting rod 321 on the isolation airbag 21. The retractable assembly 33 has its right end slidably connected to the inside of the groove 222 and its left end slidably connected to the top of the limiting assembly 32. Through the driving of the retractable assembly 33, the right end of the retractable assembly 33 can retract and limit the expansion of the limiting assembly 32, thereby facilitating the insertion and removal of the limiting assembly 32. The retractable sleeve 331 is slidably connected to the groove 222. Inside 22, the inner wall of the retractable sleeve 331 contacts the outer wall of the limiting rod 321, and the retractable sleeve 331 can retract and limit several sets of limiting rods 321. An inclined groove 332 is provided around the inner wall of the retractable sleeve 331, and the inner wall of the inclined groove 332 contacts the outer wall of the limiting rod 321. The inclined groove 332 can limit and guide the sliding of the retractable sleeve 331. A resilient rubber ring 333 is connected to the left end of the outer wall of the retractable sleeve 331, and the inner wall of the resilient rubber ring 333 contacts several sets of limiting rods 321. The limiting rod 321 contacts the outer wall and can expand and contract with the limiting rod 321 through the flexible rubber ring 333. The arc-shaped bracket 334 is installed around the outer wall of the flexible rubber ring 333, and the left end of the arc-shaped bracket 334 is inserted into the drive groove 322. At the same time, the two sides of the left end of the arc-shaped bracket 334 are slidably connected to the inside of the guide groove 323, and the flexible rubber ring 333 can keep the arc-shaped bracket 334 in sliding contact with the guide groove 323. The side bracket 335 is set in front of the arc-shaped bracket 334. At the middle position of both ends, a drive gear 336 is rotatably connected inside the side bracket 335, meshing with the tooth groove 324. A drive motor 337 is mounted on one side of the outer wall of the arc-shaped bracket 334 via a bracket, with its output connected to one side port of the drive gear 336. Driven by the drive motor 337, the drive gear 336 rotates, causing it to drive the retracting sleeve 331 to retract and limit the several sets of limiting rods 321.

[0023] Support mechanism 4 is installed on the right end of the outer wall of isolation device 2, and contacts the inner wall of oil and gas pipeline assembly 1. Support mechanism 4 is used to support and limit the right end of isolation device 2, and also to limit the state of isolation device 2 during expansion, ensuring that isolation device 2 is in a horizontal state during expansion. Support mechanism 4 includes: conical connecting sleeve 41, drive assembly 42, limiting disk 421, rotating disk 422, limiting groove 423, main gear 424, follower gear 425, support rod 426, ball bearing 427, sealing assembly 43, sealing cover plate 431, and rotary drive motor 432. Conical connecting sleeve 41 is installed on the right end of the outer wall of isolation airbag 21, and can support the right end component. The system includes a horizontal connection limiter, a drive assembly 42, which is installed at the right end of the conical connecting sleeve 41, and whose outer wall is in contact with the inner wall of the oil and gas pipeline 11. The drive assembly 42 can expand through its movement, thereby horizontally limiting the right end of the isolation airbag 21. A limit plate 421 is installed at the right end of the conical connecting sleeve 41. A rotating plate 422 is rotatably connected to the inner center of the limit plate 421, and its surface has arc grooves around its perimeter. A limit groove 423 is located around the right end of the outer wall of the limit plate 421. A main gear 424 is rotatably connected to the upper side of the left end of the outer wall of the limit plate 421. A follower gear 425 is installed at the left end of the rotating plate 422. The outer wall of the follower gear 425 meshes with the outer wall of the main gear 424. Simultaneously, the arc grooves around the surface of the follower gear 425 coincide with the arc grooves around the surface of the rotating disk 422. The rotation of the main gear 424 drives the follower gear 425 and the rotating disk 422 to rotate. The support rod 426 is slidably connected inside the limiting groove 423. A protrusion on the lower left side of the outer wall of the support rod 426 penetrates the arc grooves around the surfaces of the follower gear 425 and the rotating disk 422. The rotation of the follower gear 425 and the rotating disk 422 drives the protrusion of the support rod 426, thereby driving the support rod 426 to extend and retract. This allows the outer wall of the support rod 426 to mesh with the outer wall of the oil and gas pipeline 1. The inner wall of the oil and gas pipeline 11 is in contact with the surrounding area of ​​the inner wall of the support rod 426. The ball bearings 427 are rolled around the outer wall of the support rod 426, allowing for fine-tuning of the position of the support rod 426. A sealing assembly 43 is installed at the right end of the drive assembly 42, with its output end connected to the upper right port of the drive assembly 42. The sealing assembly 43 drives the drive assembly 42 for extended drive. A sealing cover plate 431 is installed at the right end of the limiting plate 421, and its cooperation with the limiting groove 423 restricts the movement of the support rod 426. A rotary drive motor 432 is located on the upper rear end of the outer wall of the sealing cover plate 431.The output terminal of the rotary drive motor 432 is connected to the right port of the main gear 424, and the rotary drive motor 432 can drive the main gear 424 to rotate.

[0024] In practical use, those skilled in the art insert the uninflated isolation airbag 21 into one side of the oil and gas pipeline 11 through the three-way valve port 12. By starting the rotary drive motor 432, the main gear 424, the follower gear 425, and the rotating disk 422 are driven to rotate. The arc groove on the surface of the rotating disk 422 drives the protrusion at the lower end of the support rod 426 to move, thereby extending the support rod 426 in all directions until it fully fills the oil and gas pipeline 11, so that the ball bearings of the support rod 426 contact the inner wall of the oil and gas pipeline 11, thereby horizontally limiting the right end of the uninflated isolation airbag 21. Then, by starting the drive motor 337, the drive motor 337 drives the drive gear 336 to rotate, so that the drive gear 336 rotates in the drive groove 322. The internal movement causes the drive gear 336 to move the retractable sleeve 331 and the flexible rubber ring 333 into the groove 222 of the outer airbag 221 until the limiting wheel 325 of the limiting rod 321 contacts the inner wall of the oil and gas pipeline 11. This causes the limiting wheel 325 to horizontally limit the left end of the uninflated isolation airbag 21. At this time, the external inflation pump is started to inflate the isolation airbag 21, causing it to expand. This causes the outer wall of the outer airbag 221 to contact the inner wall of the oil and gas pipeline 11 and compress the I-shaped air chamber 223 inside the outer airbag 221. Under continuous pressure, the liquid chamber, which was originally on the lower side, fills the air chamber with liquid, making the liquid part of the liquid chamber in close contact with the protruding weld bead on the inner wall of the oil and gas pipeline 11. This achieves the effect of compression and sealing, wrapping the weld bead protrusion. Because both chambers become liquid, they generate strength and play a role in resisting the gas pressure inside the pipeline.

[0025] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A temporary isolation device for hot work on oil and gas pipelines, comprising: Oil and gas pipeline assemblies are installed between oil delivery ports and are used for the transportation and transport of oil and gas. The invention is characterized by: an isolation device, which is detachably installed inside an oil and gas pipeline assembly, with its outer wall in close contact with the inner wall of the oil and gas pipeline assembly, and used to seal and block natural gas at one end of the oil and gas pipeline assembly; a limiting mechanism, installed on the left end of the outer wall of the isolation device, in contact with the inner wall of the oil and gas pipeline assembly, and used to limit and support the left end of the isolation device, thereby providing a horizontal and stable limit for the placement of the isolation device; and a support mechanism, installed on the right end of the outer wall of the isolation device, in contact with the inner wall of the oil and gas pipeline assembly, and used to support and limit the right end of the isolation device, thereby limiting the state of the isolation device during expansion and ensuring that the isolation device remains horizontal during expansion.

2. A temporary isolation device for hot work on oil and gas pipelines according to claim 1, characterized in that, The oil and gas pipeline assembly includes: Oil and gas pipelines are installed between oil delivery ports; three-way valves are located at the top of the oil and gas pipelines.

3. A temporary isolation device for hot work on oil and gas pipelines according to claim 2, characterized in that, The isolation device includes: An isolation airbag is detachably installed inside an oil and gas pipeline and connected to an external inflation pump; an isolation assembly is located in the middle of the outer wall of the isolation airbag and its outer wall contacts the raised weld bead on the inner wall of the oil and gas pipeline.

4. A temporary isolation device for hot work on an oil and gas pipeline according to claim 3, characterized in that, The isolation component includes: An external airbag is positioned in the middle of the outer wall of the isolation airbag, and its outer wall contacts the raised weld bead on the inner wall of the oil and gas pipeline; a groove is located at the left end of the outer wall of the external airbag; an I-shaped air chamber is located inside the external airbag, with its lower part configured as a liquid chamber and its upper part configured as an air chamber.

5. A temporary isolation device for hot work on an oil and gas pipeline according to claim 4, characterized in that, The limiting mechanism includes: A connecting assembly is attached to the left end of the outer wall of the isolation airbag; a limiting assembly is installed on the outer wall of the connecting assembly and makes the outer wall of the limiting assembly contact the inner wall of the oil and gas pipeline; a retracting assembly has its right end slidably connected to the inside of the groove and its left end slidably connected to the top of the limiting assembly.

6. A temporary isolation device for hot work on an oil and gas pipeline according to claim 5, characterized in that, The connection component includes: A connecting sleeve is attached to the left end of the outer wall of the isolation airbag; a first bearing seat is located around the right end of the outer wall of the connecting sleeve; and a second bearing seat is located around the left end of the outer wall of the connecting sleeve.

7. A temporary isolation device for hot work on an oil and gas pipeline according to claim 6, characterized in that, The limiting component includes: The system comprises: a limiting rod, the right end of which is rotatably connected to the inside of the first bearing seat, and several sets of limiting rods; a drive groove, located at the top of the limiting rod, allowing the retracting assembly to slide within the drive groove; a guide groove, located at both ends of the inner wall of the drive groove, allowing the guide groove to slide with the left ends of the retracting assembly; a toothed groove, located on the surface of the drive groove, connecting with the drive end of the retracting assembly; a limiting wheel, located at the left end of the limiting rod, contacting the inner wall of the oil and gas pipeline; a receiving groove, located at the bottom of the limiting rod; a top rod, one end of which is rotatably connected to the inside of the second bearing seat, and the other end of which is rotatably connected to the inside of the receiving groove; and a return spring, located on the outer wall of the top rod, with its left end connected to the left end of the top rod and its right end connected to the right end of the top rod.

8. A temporary isolation device for hot work on an oil and gas pipeline according to claim 7, characterized in that, The collapsing component includes: A retractable sleeve is slidably connected inside the groove, with its inner wall contacting the outer wall of the limiting rod; a beveled groove is located around the inner wall of the retractable sleeve, with its inner wall contacting the outer wall of the limiting rod; a flexible rubber ring is connected to the left end of the outer wall of the retractable sleeve, with its inner wall contacting the outer walls of several sets of limiting rods; an arc-shaped bracket is installed around the outer wall of the flexible rubber ring, with its left end inserted into the drive groove, and its left ends slidably connected to the guide grooves; a side bracket is located at the middle of the front and rear ends of the arc-shaped bracket; a drive gear is rotatably connected inside the side bracket, meshing with the tooth groove; and a drive motor is mounted on one side of the outer wall of the arc-shaped bracket via a bracket, with its output end connected to one side port of the drive gear.

9. A temporary isolation device for hot work on an oil and gas pipeline according to claim 8, characterized in that, The supporting structure includes: A conical connecting sleeve is installed on the right end of the outer wall of the isolation airbag; a drive assembly is installed on the right end of the conical connecting sleeve, and the outer wall of the drive assembly contacts the inner wall of the oil and gas pipeline; a sealing assembly is installed on the right end of the drive assembly, and the output end of the sealing assembly is connected to the upper right port of the drive assembly.

10. A temporary isolation device for hot work on an oil and gas pipeline according to claim 9, characterized in that, The driving component includes: A limiting disc is installed at the right end of the conical connecting sleeve; a rotating disc is rotatably connected to the inner center of the limiting disc, and the surface of the rotating disc is provided with arc grooves around its perimeter; a limiting groove is provided around the right end of the outer wall of the limiting disc; a main gear is rotatably connected to the upper side of the left end of the outer wall of the limiting disc; a follower gear is installed at the left end of the rotating disc, and the outer wall of the follower gear meshes with the outer wall of the main gear, with the arc grooves around the surface of the follower gear overlapping with the arc grooves around the surface of the rotating disc; a support rod is slidably connected inside the limiting groove, and the protrusion on the lower side of the left end of the support rod's outer wall penetrates the arc grooves around the surface of the follower gear and the surface of the rotating disc; and a ball bearing is rotatably connected around the outer wall of the support rod, and the ball bearing contacts the inner wall of the oil and gas pipeline. The sealing assembly includes: A sealing cover plate is installed on the right end of the limiting plate; a rotary drive motor is located on the upper side of the rear end of the outer wall of the sealing cover plate, and the output end of the rotary drive motor is connected to the right port of the main gear.

Images