Gas pipeline under-pressure plugging device

Abstract

The utility model relates to the technical field of under-pressure plugging, in particular to an under-pressure plugging device for a gas pipeline. Comprising two clamps which are symmetrically arranged, each clamp comprises a semicircular clamping plate, lug plates are fixed to the two ends of each clamping plate, an arc-shaped groove is formed in the inner edge of each clamping plate and is concentric with the corresponding clamping plate, groove walls on the two sides of each arc-shaped groove are inclined walls, and the ends, facing the axis of the corresponding clamping plate, of the two inclined walls are away from each other; one end of the injection nozzle is located on the outer side of the clamping plate, and the other end of the injection nozzle penetrates through the sealing gasket and then extends into the arc-shaped groove. The device supports direct plugging operation under the condition that the gas pipeline is under pressure, gas stopping or pressure relief is not needed, the pipeline interruption risk is remarkably reduced, and continuous production and operation safety are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of pressurized leak sealing technology, specifically to a pressurized sealing device for gas pipelines. Background Technology

[0002] In the gas transmission sector, gas leaks remain a major cause of various serious accidents. Currently, the primary technical means used both domestically and internationally to eliminate leaks is live leak sealing technology, aiming to quickly eliminate leaks and ensure safe and normal production operations.

[0003] In live leak sealing technology, the "sealed cavity" is mainly composed of the "leak sealing fixture" and the outer surface of the leaking area, and has strict requirements for strength, rigidity, and sealing clearance. Therefore, the leak sealing fixture is a metal component installed outside the leaking defect in live leak sealing technology, forming a sealed cavity with part of the outer surface of the leaking defect, providing strength and rigidity guarantees. It is a key element determining the success or failure of live leak sealing technology.

[0004] Patent document CN204852771U discloses a novel flange pressure sealing fixture, comprising a half-flange and lugs. The half-flange is semi-circular, with lugs welded to both ends. Symmetrically distributed fixing holes are provided on the lugs. Two half-flanges form the entire flange pressure sealing fixture. An annular protrusion is located at the center of the inner side of each half-flange. An injection port A is opened on the half-flange, passing through the protrusion. Symmetrically distributed side blocks are provided on the inner side of each half-flange, with injection ports B on the side blocks. An injection groove is provided between the side blocks and the half-flange. This fixture can perform double-layer sealing, injecting sealing agent into the flange gap through injection port B and injecting sealing agent between the two flanges through injection port A. The device cannot be disassembled after injection; disassembly will cause the intermittent sealing agent to fail, therefore this fixture is not reusable.

[0005] Patent document CN207094056U discloses a sealing flange plugging fixture, comprising a flange fixture consisting of two completely symmetrical upper flange fixture bodies and a lower flange fixture body. The upper and lower portions of the clamping surfaces of the upper and lower flange fixture bodies are respectively provided with sealing grooves. Sealing packing is provided within each sealing groove. A pressure plate is provided between the sealing packing and the bottom of the sealing groove, which can move inward under radial compression from an external object to press the sealing packing against the outer edge of the leaking flange for sealing connection. After the external object enters, it is fixed to the flange fixture and maintains pressure on the pressure plate, thereby forming a complete flange resealing structure between the upper and lower flange fixture bodies and the outer edge of the leaking flange through connecting bolts. The upper and lower flange fixture bodies are provided with injection holes for injecting sealing agent into the sealing cavity formed by the connection between the flange fixture and the leaking flange. In order to improve the sealing effect between the clamp and the outer edge of the flange, the clamping plate needs to be squeezed by injecting sealing agent or mechanical extrusion, so that the sealing packing in the injection groove is tightly pressed against the outer ring of the flange. This clamp is cumbersome to operate and reduces the efficiency of pressurized leak sealing. Utility Model Content

[0006] The main purpose of this utility model is to provide a gas pipeline pressurized sealing device that is easy to operate and has a good leak-stopping effect.

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] A pressurized sealing device for gas pipelines includes two clamps symmetrically arranged. Each clamp includes a semi-circular annular clamp plate with ear plates fixed at both ends. An arc-shaped groove is formed on the inner edge of the clamp plate, and the arc-shaped groove is concentric with the clamp plate. The groove walls on both sides of the arc-shaped groove are inclined walls, and the ends of the two inclined walls facing the axis of the clamp plate are far apart from each other. A semi-circular annular sealing gasket is fixed in the arc-shaped groove. An injection nozzle is fixed on the clamp plate, with one end of the injection nozzle located on the outside of the clamp plate and the other end of the injection nozzle extending into the arc-shaped groove after passing through the sealing gasket.

[0009] Specifically, the ear plates are provided with through holes, and when the two clamps are assembled, the connecting bolts pass through the through holes of the two opposite ear plates, and nuts are threaded onto the connecting bolts.

[0010] Specifically, the sealing gasket is made of elastic rubber.

[0011] Specifically, the injection nozzle is threadedly sealed to the clamp plate.

[0012] Specifically, the injection nozzle on the outer side of the clamp is internally threaded and sealed with a plug.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This device supports direct leak sealing operations under pressurized gas pipeline conditions without the need for gas outages or pressure relief, significantly reducing the risk of pipeline interruption and ensuring continuous production and operational safety. The symmetrical design of the clamps and the progressive tightening mechanism ensure a stable and controllable leak sealing process, preventing secondary leaks caused by pressure fluctuations.

[0015] 2. The inclined wall design achieves line contact at the outer edge of the flange, forming a double barrier with the compression seal of the gasket. This not only effectively isolates external leakage but also precisely limits the injection range, preventing injection waste or accidental diffusion, thus improving sealing reliability and leak plugging efficiency.

[0016] The three injection nozzles are replaceable and easy to replace when damaged, reducing maintenance costs. The overall lightweight design facilitates rapid deployment and disassembly in the field, improving operational flexibility.

[0017] 4. The injection nozzle is equipped with a threaded sealing plug, which prevents blockage by debris during storage and prevents backflow of the injection fluid after operation, ensuring a stable solidification process. This design extends the life of the device, supports continuous operation, and improves resource utilization. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the fixture.

[0019] Figure 2 This is a schematic diagram of the device used to seal leaks in two connected flanges.

[0020] Figure 3 This is a side view of the device when sealing leaks at two connected flanges.

[0021] Figure 4 for Figure 3 Sectional view along the AA direction.

[0022] Figure 5 This is a front view of the device when sealing leaks at two connected flanges.

[0023] Figure 6 for Figure 5 Sectional view along the BB direction.

[0024] The components in the attached diagram are named as follows: 1. Clamping plate, 2. Ear plate, 3. Perforation, 4. Inclined wall, 5. Sealing gasket, 6. Injection nozzle, 7. Pipe, 8. Flange, 9. Fixing bolt, 10. Connecting bolt, 11. Sealing ring. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Example 1: Refer to Figures 1-6 As shown, a pressurized sealing device for a gas pipeline includes two clamps, which are symmetrically arranged.

[0027] The clamp includes a semi-circular annular clamp 1, with ear plates 2 fixed at both ends of the clamp 1. The ear plates 2 have through holes 3. When the two clamps are assembled, the connecting bolts 10 pass through the through holes 3 of the two ear plates 2. Nuts are threaded onto the connecting bolts 10.

[0028] The inner edge of the clamping plate 1 is provided with an arc-shaped groove, which is concentric with the clamping plate 1. The groove walls on both sides of the arc-shaped groove are inclined walls 4, and the two inclined walls 4 are far apart from each other at the ends facing the axis of the clamping plate 1.

[0029] A semi-circular sealing gasket 5 is fixed inside the arc-shaped groove. The sealing gasket 5 is made of elastic rubber.

[0030] An injection nozzle 6 is fixed on the clamp plate 1. One end of the injection nozzle 6 is located on the outside of the clamp plate 1, and the other end of the injection nozzle 6 extends into the arc-shaped groove after passing through the sealing gasket 5.

[0031] When two pipe sections 7 are connected, sealing flanges 8 are fixed on both pipe sections 7. When the two flanges 8 are connected, a sealing ring 11 is installed between the two flanges 8. The two flanges 8 are tightened by the cooperation of multiple fixing bolts 9 and multiple nuts. The sealing ring 11 can prevent leakage between the two flanges 8.

[0032] When the sealing ring 11 is damaged and the flange 8 needs to be sealed under pressure, select a fixture of the appropriate size according to the size of the flange 8 so that after the two fixtures are assembled, the outer edges of the opposite sides of the two flanges 8 can be in tight contact with the two inclined walls 4 respectively.

[0033] During installation, two clamps are fitted onto the outside of the two flanges 8, with the two clamps facing each other. Connecting bolts 10 are passed through the through holes 3 of the two opposing ear plates 2. Nuts are then threaded onto the connecting bolts 10, and the bolts are tightened to bring the two clamps 1 closer together. When the ends of the two clamps 1 are tightly abutted, they form a ring, and the two sealing gaskets 5 form a sealing ring. The outer edges of the opposite sides of the two flanges 8 are in close contact with the two inclined sections, and the outer edges of the flanges 8 are in line contact with the inclined wall 4 on one side.

[0034] At the same time, the outer edge of flange 8 is pressed tightly against gasket 5, gasket 5 is squeezed, and gasket 5 and outer edge of flange 8 are in sealing contact.

[0035] Then, the high-pressure injection gun is connected to the injection nozzle 6, and the high-pressure injection gun is used to inject sealing agent into the gap between the two flanges 8. The leak between the two flanges 8 is plugged by the sealing agent injected into the gap between the two flanges 8.

[0036] When injecting sealant between the two flanges 8, leakage of sealant can be avoided because the outer edge of flange 8 is in line contact with the inclined wall 4 on one side, and the sealing gasket 5 is in sealing contact with the outer edge of flange 8. At the same time, the sealing gasket 5 can also limit the injection position of sealant, ensuring that the sealant is only injected between the two flanges 8 and in the hole where the fixing bolts 9 are located.

[0037] Example 2: Based on Example 1, the injection nozzle 6 is threadedly sealed to the clamping plate 1. A plug is threadedly sealed to one end of the injection nozzle 6 on the outer side of the clamping plate 1.

[0038] When the injection nozzle 6 is damaged, it can be easily replaced. A plug is connected to the injection nozzle 6 by an internal thread on the outside of the clamp plate 1. The plug can seal the injection nozzle 6, and the device can prevent foreign objects from falling into the injection nozzle 6 and causing blockage when stored.

[0039] After the injection is completed, the high-pressure injection gun can be disassembled and the plug can be installed into the injection nozzle 6 to prevent the sealing injection from flowing back. After the injection is completed, the high-pressure injection gun can be disassembled and the next sealing device can be injected.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressurized sealing device for a gas pipeline, comprising two clamps symmetrically arranged, each clamp including a semi-circular annular clamp (1), with ear plates (2) fixed at both ends of the clamp (1), characterized in that, The inner edge of the clamp (1) is provided with an arc-shaped groove, which is concentric with the clamp (1). The groove walls on both sides of the arc-shaped groove are inclined walls (4). The ends of the two inclined walls (4) facing the axis of the clamp (1) are far apart from each other. A semi-circular sealing gasket (5) is fixed in the arc-shaped groove. An injection nozzle (6) is fixed on the clamp (1). One end of the injection nozzle (6) is located outside the clamp (1), and the other end of the injection nozzle (6) extends into the arc-shaped groove after passing through the sealing gasket (5).

2. The pressurized sealing device for gas pipelines according to claim 1, characterized in that, The ear plate (2) has a through hole (3). When the two clamps are assembled, the connecting bolt (10) passes through the through hole (3) of the two ear plates (2) respectively. The connecting bolt (10) is threaded with a nut.

3. The pressurized sealing device for gas pipelines according to claim 1, characterized in that, The sealing gasket (5) is made of elastic rubber.

4. The pressurized sealing device for gas pipelines according to claim 1, characterized in that, The injection nozzle (6) is threadedly sealed to the clamp plate (1).

5. The pressurized sealing device for gas pipelines according to claim 1, characterized in that, The injection nozzle (6) on the outer side of the clamp (1) is internally threaded and sealed with a plug.

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