Double seal leak-proof flange assembly for coal gas station return pipe

Abstract

The utility model relates to pipeline anti-leakage technical field discloses a coal gas station material returning pipe double seal anti-leakage flange assembly, include: 2 by the side ring of surrounding ring, the surrounding ring will be wrapped, the side ring inner wall is provided with semicircle sealing element, semicircle sealing element and flange disc circumference surface are pasted, with the end cover that side ring is connected, the end cover bottom surface is provided with the compression part, the sheath sealing element that sheath is wrapped on the pipeline, the end sealing part of sheath sealing element end and flange surface are pasted, sheath sealing element inner wall and pipeline are pasted, the end sealing part is compressed by compression part, sheath sealing element outer wall is compressed by end cover inner camber surface.The utility model is located in the outside of the connecting flange, forms 2 times sealing, improves the sealing performance of pipeline, effectively prevents the pipeline leakage, especially the pipeline of high temperature, reduces the risk of leakage and the pollution to the environment, guarantees production safety and environmental protection.

Description

Technical Field

[0001] This utility model relates to the field of pipeline leakage prevention technology, and more specifically, it relates to a double-sealed leakage prevention flange assembly for gas station return pipes. Background Technology

[0002] Magnesium and aluminum, as indispensable basic materials in modern industrial systems, are widely used in key fields such as aerospace, transportation, and electronics manufacturing. Their production processes place stringent requirements on the stability, safety, and efficiency of energy supply. Gas stations, as the core energy guarantee unit in magnesium and aluminum production, bear the critical task of providing a continuous supply of clean gas to core processes such as the reduction workshop. The gas return pipe, as a crucial component of the gas transportation and circulation system, directly affects the sealing performance, pressure stability, and production continuity of the gas transportation. Under high-temperature and high-pressure operating conditions, the flange connections of the return pipe undergo rigorous testing over extended periods. Their sealing performance not only affects gas utilization efficiency but also directly relates to production safety and environmental compliance.

[0003] Due to design limitations, the return feed pipe uses a flange connection, sealed with asbestos rope. Asbestos rope typically has a high-temperature resistance limit between 600℃ and 1000℃; however, its structural water can break out. Asbestos rope ages, its structure deteriorates, becoming brittle and discoloring, leading to gas leakage from the return feed pipe flange. Replacing the graphite rope seal requires dismantling the return feed pipe, resulting in high labor and material costs. The construction period for a single furnace is two months, disrupting the normal gas supply to the reduction workshop. Therefore, there is an urgent need to design a double-sealed leak-proof flange assembly for the gas station's return feed pipe to solve these problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a double-sealed anti-leakage flange assembly for the return pipe of a gas station. It is located outside the connecting flange, which improves the sealing performance of the pipeline, effectively prevents pipeline leakage, especially for high-temperature pipelines, reduces leakage risk and environmental pollution, and ensures production safety and environmental protection.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] The gas station return pipe double-sealed leak-proof flange assembly includes:

[0007] Two wrapping rings composed of side rings wrap around the flange connection. The inner wall of each side ring is provided with a semi-circular seal, which is in contact with the circumferential surface of the flange.

[0008] An end cap connected to the side ring, wherein a pressing part is provided on the bottom surface of the end cap;

[0009] A sheathed seal is fitted onto a pipeline, wherein the end sealing portion of the sheathed seal is in contact with the flange face, the inner wall of the sheathed seal is in contact with the pipeline, the end sealing portion is pressed by the pressing portion, and the outer wall of the sheathed seal is pressed by the inner arc surface of the end cap.

[0010] As a further improvement to this utility model, the side ring is provided with two mating parts. The mating parts of the two side rings are aligned and attached together and locked with fasteners so that the two side rings form a ring shape.

[0011] As a further improvement to this utility model, the outer wall of the side ring is provided with an integral connecting part, and the end cap is provided with a matching connecting ear, and the connecting ear and the connecting part are connected by fasteners.

[0012] As a further improvement to this utility model, the inner wall of the side ring is provided with stepped grooves at the upper and lower ends, and the bottom surface of the end cap is provided with a stepped edge along the outer side, and the stepped edge can be embedded in the stepped groove.

[0013] As a further improvement to this utility model, the end cap and the side ring are connected in a staggered manner.

[0014] As a further improvement to this utility model, the end sealing part is designed to have two parts, and the end sealing part and the sleeve sealing element are designed as an integral unit.

[0015] As a further improvement to this utility model, the sheath seal and the semi-circular seal are made of the same material, and the sheath seal and the semi-circular seal can be flexible graphite sealing rings.

[0016] The beneficial technical effects of this utility model are:

[0017] This invention utilizes a semi-circular sealing element that adheres to the circumference of the flange, and an end sealing portion of the sleeve sealing element that adheres to the flange surface and has its inner wall fitted to the pipeline, forming a double-seal protection that comprehensively covers critical leakage points in flange connections. It is suitable for the harsh operating conditions of high temperature and high pressure in gas station return pipes, effectively solving the technical pain point of easy leakage with traditional asbestos rope seals, ensuring the sealing performance and pressure stability of gas transmission. The sealing element is made of flexible graphite material, whose high-temperature resistance far exceeds that of traditional asbestos rope, and its structure is stable and not prone to aging and embrittlement.

[0018] The side ring adopts a two-piece splicing design, combined with the fastener connection structure between the end cap and the side ring, and the positioning fit between the stepped groove and the stepped edge, so that the component can be installed and disassembled without removing the return pipe body. Compared with the traditional seal replacement that requires a two-month downtime, this utility model significantly shortens the maintenance period, reduces labor input, and reduces material consumption and downtime losses during maintenance. By reducing leakage failures and maintenance downtime, it ensures a continuous and stable gas supply from the gas station to the magnesium-aluminum production reduction workshop, avoiding production progress disruptions due to downtime; at the same time, it reduces safety hazards caused by gas leaks, meets environmental compliance requirements, and balances production efficiency, safety, and environmental protection. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0020] Figure 2 This is a partial perspective view of the present invention;

[0021] Figure 3 This is a three-dimensional schematic diagram of the side ring and the semi-circular seal in this utility model;

[0022] Figure 4 This is a three-dimensional schematic diagram of the end cap of this utility model;

[0023] Figure 5 This is a three-dimensional schematic diagram of the sealing element in this utility model.

[0024] In the figure: 1. Side ring; 11. Butt joint; 12. Connecting part; 13. Stepped groove; 2. End cap; 21. Pressing part; 22. Connecting ear; 23. Stepped edge; 3. Enclosure seal; 31. End seal; 4. Semicircular seal. Detailed Implementation

[0025] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0026] Combination Figure 1 - Figure 5 The present invention provides the following embodiments:

[0027] The gas station return pipe double-sealed leak-proof flange assembly includes:

[0028] Two wrapping rings consisting of side rings 1 wrap around the flange connection. The inner wall of the side ring 1 is provided with a semi-circular seal 4, which is in contact with the circumferential surface of the flange.

[0029] The end cap 2 is connected to the side ring 1, and the bottom surface of the end cap 2 is provided with a pressing part 21;

[0030] The sealing element 3 is wrapped around the pipeline. The end sealing part 31 of the sealing element 3 is in contact with the flange face, the inner wall of the sealing element 3 is in contact with the pipeline, the end sealing part 31 is pressed by the pressing part 21, and the outer wall of the sealing element 3 is pressed by the inner arc surface of the end cover 2.

[0031] Combination Figure 1 and Figure 2 In this embodiment, the sheathed sealing element 3 with end sealing part 31 is attached to the return pipe, and the two sheathed sealing elements 3 completely wrap the return pipe. The end sealing part 31 is attached to the bottom surface of the flange. The side rings 1 are used to wrap the circumferential surfaces of the two flanges, and the two side rings 1 can be assembled together. After assembly, the semi-circular sealing element 4 on the inner side of the side ring 1 is tightly attached to the circumferential surface of the flange, which plays a primary sealing role. The sheathed sealing element 3 with end sealing part 31 mentioned above plays a secondary sealing role. In this embodiment, the end cap 2 is used to seal the upper and lower ends of the assembled side ring 1. The pressing part 21 of the end cap 2 can also press the end sealing part 31. The construction of this embodiment is fast, without the need to remove the pipeline, which significantly shortens the maintenance period, reduces labor input, reduces material loss and downtime losses during the maintenance process, ensures a continuous and stable gas supply from the gas station to the magnesium-aluminum production reduction workshop, and avoids production progress affected by downtime; it meets environmental compliance requirements and takes into account production efficiency, safety and environmental protection.

[0032] Furthermore, the side ring 1 is provided with two mating portions 11. The mating portions 11 of the two side rings 1 are aligned and fastened together with fasteners, forming a circular ring. Specifically, referring to the attached drawings, the mating portion 11 is a flat plate structure extending outward from the end of the side ring 1, integrally formed. The mating portion 11 has threaded holes or through holes adapted to the fasteners. This splicing design breaks through the installation limitations of the integral ring structure. The fastener locking of the mating portions enables rapid assembly and fixation of the side rings, allowing for the fitting and fixing of the side rings without disassembling the return pipe, significantly simplifying the installation process.

[0033] Furthermore, the outer wall of the side ring 1 is provided with an integral connecting part 12, and the end cap 2 is provided with a matching connecting ear 22. The connecting ear 22 and the connecting part 12 are connected by fasteners. The connecting part 12 is a raised seat integrally formed on the outer wall of the side ring, and is evenly distributed along the circumference of the side ring. In this embodiment, there are two connecting parts 12 on the outside of a single side ring 1, which is the same number as the connecting ear 22. The connection structure is simple and reliable, easy to disassemble and assemble, and facilitates quick separation of the end cap and the side ring during later maintenance.

[0034] Furthermore, stepped grooves 13 are formed at the upper and lower ends of the inner wall of the side ring 1, and a stepped edge 23 is formed along the outer side of the bottom surface of the end cover 2. The stepped edge 23 can be embedded in the stepped groove 13. The concave and convex fit between the stepped edge 23 and the stepped groove 13 forms a positioning reference, restricting the displacement of the end cover 2. At the same time, the interference fit fills the assembly gap between the end cover 2 and the side ring 1, reducing the path of gas leakage from the assembly gap.

[0035] Furthermore, the end cap 2 and the side ring 1 are connected in a staggered manner. The staggered connection means that the connecting lug 22 of the end cap 2 and the connecting part 12 of the side ring 1 are staggered in the circumferential direction.

[0036] Furthermore, the end seal 31 is designed with two parts, and the end seal 31 and the sheath seal 3 are designed as an integral unit. The integral structure avoids the connection gap of the split seal parts, while improving the structural strength of the seal and preventing the end seal parts from falling off; the design of two parts, one on top and one on the bottom, eliminates the need to distinguish between the front and the back, and makes installation more convenient.

[0037] Furthermore, the sheath seal 3 and the semi-circular seal 4 are made of the same material, and both the sheath seal 3 and the semi-circular seal 4 can be flexible graphite sealing rings. This gives the sheath seal 3 and the semi-circular seal 4 high temperature resistance and corrosion resistance, solving the problems of insufficient high temperature resistance and easy aging and embrittlement of traditional asbestos ropes. At the same time, the chemical stability of flexible graphite prevents it from reacting with the components of coal gas, ensuring long-term stable sealing performance and reducing environmental risks.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A double-sealed leak-proof flange assembly for the return pipe of a gas station, characterized in that, include: Two wrapping rings consisting of side rings (1) wrap around the flange connection. The inner wall of the side ring (1) is provided with a semi-circular seal (4), which is in contact with the circumferential surface of the flange. The end cap (2) is connected to the side ring (1), and the bottom surface of the end cap (2) is provided with a pressing part (21). The sheath seal (3) is wrapped around the pipeline. The end sealing part (31) of the sheath seal (3) is in contact with the flange surface. The inner wall of the sheath seal (3) is in contact with the pipeline. The end sealing part (31) is pressed by the pressing part (21). The outer wall of the sheath seal (3) is pressed by the inner arc surface of the end cap (2).

2. The double-sealed leak-proof flange assembly for the gas station return pipe according to claim 1, characterized in that, The side ring (1) is provided with two docking parts (11). The docking parts (11) of the two side rings (1) are aligned and attached to each other and locked with fasteners so that the two side rings (1) form a ring shape.

3. The double-sealed leak-proof flange assembly for the gas station return pipe according to claim 1, characterized in that, The outer wall of the side ring (1) is provided with an integral connecting part (12), and the end cap (2) is provided with a matching connecting ear (22), and the connecting ear (22) and the connecting part (12) are connected by fasteners.

4. The double-sealed leak-proof flange assembly for the gas station return pipe according to claim 3, characterized in that, The inner wall of the side ring (1) is provided with stepped grooves (13) at the upper and lower ends, and the bottom surface of the end cap (2) is provided with a stepped edge (23) along the outer side, and the stepped edge (23) can be embedded in the stepped groove (13).

5. The double-sealed leak-proof flange assembly for the gas station return pipe according to claim 3, characterized in that, The end cap (2) is misaligned with the side ring (1).

6. The double-sealed leak-proof flange assembly for the gas station return pipe according to claim 1, characterized in that, The end sealing part (31) is designed in two parts, and the end sealing part (31) and the sleeve sealing part (3) are designed as an integral unit.

7. The double-sealed leak-proof flange assembly for the gas station return pipe according to claim 1, characterized in that, The sheath seal (3) and the semi-circular seal (4) are made of the same material. The sheath seal (3) and the semi-circular seal (4) can be flexible graphite sealing rings.

Images