Two-stage seal device for oil and gas pipelines

Abstract

The utility model discloses two -stage sealing device for oil and gas pipeline, including two -stage pipeline main part, the one end of two -stage pipeline main part is close to each other and all is welded with flange, is connected through the connecting mechanism between two flanges, the side of two flanges is close to each other and all is seted up with containing groove, the inner wall of containing groove is seted up with the slot, two flanges between being equipped with sealed transition pipe body, the both ends of sealed transition pipe body all integrative connection have the protruding edge of inserting into containing groove, still be installed on sealed transition pipe body and protrude into the slot of end protruding pipe, be equipped with first sealing mechanism between protruding pipe and slot, the second sealing mechanism between protruding edge and containing groove. The utility model discloses through setting first sealing mechanism and second sealing mechanism, can play the role of two -stage sealing, when a sealing mechanism failure, another sealing mechanism can play the sealing protection function, significantly reduce the leakage risk of oil and gas, improve the continuity of oil and gas pipeline transportation.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas pipeline technology, specifically to a double-stage sealing device for oil and gas pipelines. Background Technology

[0002] A pipeline is a device made up of pipes, pipe fittings, valves, etc., used to transport gases, liquids, or fluids containing solid particles. Typically, fluids are pressurized by blowers, compressors, pumps, boilers, etc., and then flow from the high-pressure area to the low-pressure area in the pipeline. They can also be transported using the fluid's own pressure or gravity. Pipelines have a wide range of uses, mainly in water supply, drainage, heating, gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, water conservancy projects, and various industrial installations. Oil and gas pipelines are a type of pipeline specifically designed for long-distance transportation of media such as oil and natural gas, and are the main arteries of the modern energy supply chain.

[0003] When multiple oil and gas pipelines are spliced ​​together, they are usually connected by flanges. The flanges achieve a sealing connection between the two pipelines through a single sealing structure (such as a gasket or sealing ring). The core objective is to prevent fluid leakage. The key to its effective sealing is to generate sufficient pressure by tightening the bolts, causing the gasket to undergo elastic or plastic deformation, filling the microscopic unevenness on the sealing surfaces of the two flanges, thereby blocking the leakage path. However, a single sealing structure is very prone to seal failure when the sealing gasket ages, resulting in leakage at the connection between the two pipelines. Utility Model Content

[0004] The purpose of this invention is to provide a two-stage sealing device for oil and gas pipelines to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dual-stage sealing device for oil and gas pipelines, comprising two pipeline bodies, each with a flange welded to one end of the two pipeline bodies that are close to each other, the two flanges being connected by a connecting mechanism, each flange having a receiving groove on one side that is close to each other, the inner wall of the receiving groove having a slot, a sealing transition pipe body being provided between the two flanges, both ends of the sealing transition pipe body being integrally connected with a protruding edge extending into the receiving groove, a protruding tube with its end extending into the slot being installed on the sealing transition pipe body, a first sealing mechanism being provided between the protruding tube and the slot, and a second sealing mechanism being provided between the protruding edge and the receiving groove.

[0006] Preferably, the first sealing mechanism includes a first O-ring and an annular inner edge, the inner edge being connected to the inner wall of the slot, and the first O-ring being fitted onto the protruding tube.

[0007] Preferably, the convex tube extends inward along the body, and the end of the convex tube is inserted into the inner cavity of the inner body.

[0008] Preferably, the second sealing mechanism includes an annular pressure plate and a second O-ring. The pressure plate is sleeved on the convex tube and is located in the inner cavity of the convex edge. A second sealing groove is formed between the outer wall of the pressure plate and the inner wall of the convex edge, and the second O-ring is assembled in the second sealing groove.

[0009] Preferably, the outer wall of the convex tube has an annular outer edge, and a first sealing groove for accommodating a first O-ring is formed between the outer edge and the inner edge.

[0010] Preferably, one side of the pressure plate is integrally connected with an annular protrusion that extends into the slot. A third sealing groove is formed between the protrusion and the outer edge, and a third O-ring is fitted in the third sealing groove.

[0011] Preferably, the connecting mechanism includes a screw and a nut, with the screw passing between the two flanges, and both ends of the screw being threaded with nuts.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. By setting up a first sealing mechanism and a second sealing mechanism, this utility model can achieve a dual-level sealing function. When one sealing mechanism fails, the other sealing mechanism can play a sealing and protective role, significantly reducing the risk of oil and gas leakage and improving the continuity of oil and gas pipeline transportation.

[0013] 2. By setting a third O-ring, this utility model can serve as a backup for the first O-ring, providing a protective seal when the first O-ring fails. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the flange structure of this utility model; Figure 3 This is a schematic diagram of the structure of the sealing transition tube body of this utility model; Figure 4 This is a cross-sectional structural diagram of the flange of this utility model; Figure 5 This is an enlarged schematic diagram of point A of this utility model.

[0015] In the diagram: 1. Pipe body; 2. Flange; 3. Sealing transition pipe body; 4. Receiving groove; 5. Raised flange; 6. Slot; 7. Raised pipe; 8. Inner edge body; 9. First O-ring seal; 10. Outer edge body; 11. Pressure plate; 12. Second O-ring seal; 13. Protrusion; 14. Screw; 15. Nut; 16. Third O-ring seal. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-5 This utility model provides a technical solution: a double-stage sealing device for oil and gas pipelines, comprising two pipeline bodies 1, each with a flange 2 welded to one end of the two pipeline bodies 1 that are close to each other. The two flanges 2 are connected by a connecting mechanism. Each of the two flanges 2 has a receiving groove 4 on one side that is close to each other. The inner wall of the receiving groove 4 has a slot 6. A sealing transition pipe 3 is provided between the two flanges 2. Both ends of the sealing transition pipe 3 are integrally connected with a protruding edge 5 that extends into the receiving groove 4. A protruding tube 7 with its end extending into the slot 6 is also installed on the sealing transition pipe 3. A first sealing mechanism is provided between the protruding tube 7 and the slot 6, and a second sealing mechanism is provided between the protruding edge 5 and the receiving groove 4.

[0018] The first and second sealing mechanisms work together to provide a dual-level seal. If one sealing mechanism fails, the other can provide a protective seal, significantly reducing the risk of oil and gas leakage.

[0019] The first sealing mechanism includes a first O-ring 9 and an annular inner edge 8. The inner edge 8 is connected to the inner wall of the slot 6, and the first O-ring 9 is sleeved on the protruding tube 7.

[0020] The first O-ring 9 is located between the inner wall of the slot 6, the outer wall of the convex tube 7, and the inner edge 8. The first O-ring 9 is closest to the conveyed oil and gas, and plays the role of the first sealing function.

[0021] The convex tube 7 extends inward along the body 8, and the end of the convex tube 7 is inserted into the inner cavity of the inner body 8.

[0022] The outer diameter of the convex tube 7 is smaller than the inner diameter of the inner edge body 8, so that the convex tube 7 can be inserted into the inner cavity of the inner edge body 8, but the convex tube 7 does not completely pass through the inner cavity of the inner edge body 8, that is, the convex tube 7 does not pass through the entire flange 2.

[0023] The second sealing mechanism includes an annular pressure plate 11 and a second O-ring seal 12. The pressure plate 11 is sleeved on the convex tube 7. The pressure plate 11 is located in the inner cavity of the convex edge 5. A second sealing groove is formed between the outer wall of the pressure plate 11 and the inner wall of the convex edge 5. The second O-ring seal 12 is assembled in the second sealing groove.

[0024] A sealing ring assembly groove can be opened on the inner wall of the flange 5. The second O-ring 12 is assembled in this sealing ring assembly groove. When the protruding tube 7 is inserted into the slot 6, the pressure plate 11 will be located between the inner side wall of the slot 6 and the end of the sealing transition tube 3. The outer diameter of the pressure plate 11 is smaller than the inner diameter of the flange 5. Therefore, there is a gap between the pressure plate 11 and the inner wall of the flange 5. This gap, together with the inner side wall of the receiving groove 4, forms a second sealing groove, which allows the second O-ring 12 to be accommodated in the second sealing groove.

[0025] When the flanges 2 of the two pipe bodies 1 are connected close to each other, the second O-ring 12 can be compressed, and the second O-ring 12 plays a second sealing role.

[0026] The outer wall of the convex tube 7 has an annular outer edge 10, and a first sealing groove is formed between the outer edge 10 and the inner edge 8 to accommodate the first O-ring seal 9.

[0027] An annular mounting groove is provided on the outer wall of the convex tube 7. The first O-ring seal 9 is mounted in this mounting groove. When the convex tube 7 is inserted into the slot 6, the first O-ring seal 9 is squeezed to achieve a sealing and protective function.

[0028] One side of the pressure plate 11 is integrally connected with an annular protrusion 13, which extends into the slot 6. A third sealing groove is formed between the protrusion 13 and the outer edge body 10, and a third O-ring seal 16 is assembled in the third sealing groove.

[0029] The outer wall of the convex tube 7 is also provided with an annular groove, and the third O-ring seal 16 is assembled in this annular groove. When the convex tube 7 is inserted into the slot 6, the pressure plate 11 is pressed against it. At this time, the protrusion 13 at the end of the pressure plate 11 will extend into the slot 6 to squeeze the third O-ring seal 16.

[0030] The outer edge 10 separates the first O-ring 9 and the third O-ring 16. The first O-ring 9 is closest to the oil and gas being transported. When the first O-ring 9 fails, the third O-ring 16 serves as a backup for the first O-ring 9 to provide sealing protection.

[0031] The connecting mechanism includes a screw 14 and a nut 15. The screw 14 passes between the two flanges 2, and both ends of the screw 14 are threaded with nuts 15.

[0032] Each flange 2 has a ring of mounting holes. When the flanges 2 between the two pipe bodies 1 are connected, the screw 14 will pass through the mounting holes of the two flanges 2. At this time, a gasket is placed on the part of the screw 14 that passes through the mounting hole, and the nut 15 is tightened so that the nut 15 presses the flange 2 together, which can connect the two pipe bodies 1 together. At the same time, the two ends of the sealing transition pipe body 3 will press against the two flanges 2 so that the first sealing mechanism and the second sealing mechanism can play a sealing role.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-stage sealing device for oil and gas pipelines, comprising two pipeline sections (1), characterized in that: The two sections of the main body of the pipe (1) are welded with flanges (2) at their close ends. The two flanges (2) are connected by a connecting mechanism. The two flanges (2) are provided with a receiving groove (4) on their close sides. The inner wall of the receiving groove (4) is provided with a slot (6). A sealing transition pipe (3) is provided between the two flanges (2). Both ends of the sealing transition pipe (3) are integrally connected with a protruding edge (5) that extends into the receiving groove (4). A protruding tube (7) with its end extending into the slot (6) is also installed on the sealing transition pipe (3). A first sealing mechanism is provided between the protruding tube (7) and the slot (6). A second sealing mechanism is provided between the protruding edge (5) and the receiving groove (4).

2. The dual-stage sealing device for oil and gas pipelines according to claim 1, characterized in that: The first sealing mechanism includes a first O-ring (9) and an annular inner edge (8), the inner edge (8) being connected to the inner wall of the slot (6), and the first O-ring (9) being fitted onto the protruding tube (7).

3. The dual-stage sealing device for oil and gas pipelines according to claim 2, characterized in that: The convex tube (7) extends inward along the body (8), and the end of the convex tube (7) is inserted into the inner cavity of the inner body (8).

4. The dual-stage sealing device for oil and gas pipelines according to claim 2, characterized in that: The second sealing mechanism includes an annular pressure plate (11) and a second O-ring seal (12). The pressure plate (11) is sleeved on the convex tube (7). The pressure plate (11) is located in the inner cavity of the convex edge (5). A second sealing groove is formed between the outer wall of the pressure plate (11) and the inner wall of the convex edge (5). The second O-ring seal (12) is assembled in the second sealing groove.

5. The dual-stage sealing device for oil and gas pipelines according to claim 4, characterized in that: The outer wall of the convex tube (7) has an annular outer edge (10), and a first sealing groove for accommodating the first O-ring (9) is formed between the outer edge (10) and the inner edge (8).

6. The dual-stage sealing device for oil and gas pipelines according to claim 5, characterized in that: One side of the pressure plate (11) is integrally connected with an annular protrusion (13), the protrusion (13) extends into the slot (6), a third sealing groove is formed between the protrusion (13) and the outer edge body (10), and a third O-ring (16) is assembled in the third sealing groove.

7. The dual-stage sealing device for oil and gas pipelines according to claim 1, characterized in that: The connecting mechanism includes a screw (14) and a nut (15). The screw (14) is inserted between the two flanges (2), and the two ends of the screw (14) are threaded with nuts (15).

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