A flange for sealing oil refining pipes

Abstract

This utility model relates to the field of flange technology, and in particular to a flange for sealing oil refining pipes, comprising a first connecting flange and a second connecting flange. The inner surface of the first connecting flange has a first annular groove, a second annular groove, and a third annular groove sequentially formed from the inside out. The inner surface of the second connecting flange has a first sealing ring, a second sealing ring, and a third sealing ring sequentially formed from the inside out. Both the first and second connecting flanges have several mounting holes on their outer rings. A top plate is provided above each mounting hole, and a vertically arranged first threaded rod is threaded onto the top plate. A horizontally arranged second threaded rod is threaded onto the first threaded rod. This utility model uses two threaded rods, one horizontally and one vertically, to fix and abut the threaded rods of the connecting flanges, effectively preventing the flange threaded rods from loosening and improving the sealing effect.

Description

Technical Field

[0001] This utility model relates to a flange for pipe sealing, and more particularly to a flange for sealing oil refining pipes, belonging to the field of flange technology. Background Technology

[0002] In the field of oil refining, dedicated oil pipelines are required for oil transportation. These pipelines often need to be laid over long distances, so multiple pipelines need to be connected end to end to form a complete oil transportation line. The connection and sealing between adjacent pipelines require the use of dedicated sealing flanges for installation.

[0003] When using sealing flanges, two flanges are usually fixed together with bolts. However, during the transportation of oil, due to the high pressure, the internal pressure of the pipeline is relatively large. Combined with the vibration of the pipeline itself caused by the micro-vibrations of the pipeline operation, the bolt structure is prone to loosening over time, causing the internal sealing ring to slip and creating gaps, resulting in seal failure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a flange for sealing oil refining pipes that effectively improves sealing performance.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A sealing flange for an oil refining pipe includes a first connecting flange and a second connecting flange. The inner surface of the first connecting flange is provided with a first annular groove, a second annular groove, and a third annular groove from the inside to the outside. The inner surface of the second connecting flange is provided with a first sealing ring, a second sealing ring, and a third sealing ring from the inside to the outside. The outer rings of both the first and second connecting flanges are provided with a plurality of mounting holes. A top plate is provided above each mounting hole. A vertically arranged first threaded rod is threaded into the top plate, and a horizontally arranged second threaded rod is threaded into the first threaded rod.

[0007] Furthermore, welded pipes are provided on the outer sides of both the first and second connecting flanges.

[0008] Furthermore, the first annular groove is a T-shaped annular groove, which is formed on the inner ring of the first connecting flange, and the first sealing ring is disposed on the innermost ring of the second connecting flange and is adapted to the shape of the T-shaped annular groove.

[0009] Furthermore, the second annular groove and the third annular groove are respectively provided with positioning holes and positioning grooves, and the second sealing ring and the third sealing ring are respectively provided with positioning rods and positioning plates that are adapted to the positioning holes and positioning grooves.

[0010] Furthermore, the top plate is provided with a first threaded hole for threaded installation with the first threaded rod, the first threaded rod is provided with a second threaded hole for threaded connection with the second threaded rod, and both the outer ends of the first threaded rod and the second threaded rod are provided with handles.

[0011] Furthermore, a gasket mounting groove with a diameter larger than that of the mounting hole is provided on the outer side of the mounting hole, and the gasket mounting groove is used to install a rubber sealing ring.

[0012] Furthermore, auxiliary annular grooves are provided on the outer sides of the opposing surfaces of the first connecting flange and the second connecting flange.

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

[0014] This application effectively improves the sealing effect after flange connection by using multiple sealing rings and annular grooves for snap-fit ​​adaptation. Furthermore, the use of two threaded rods arranged laterally and longitudinally can fix and abut the threaded rods of the connecting flange, effectively preventing the flange threaded rods from loosening and improving the sealing effect during long-term use after flange connection. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a three-dimensional structural diagram of the second connecting flange of this utility model;

[0017] Figure 3 This is a schematic cross-sectional view illustrating the connection state of this utility model;

[0018] Figure 4 This is a schematic cross-sectional view of the present invention in an unconnected state.

[0019] In the figure, 1. First connecting flange; 2. Second connecting flange; 3. First annular groove; 4. Second annular groove; 5. Third annular groove; 6. First sealing ring; 7. Second sealing ring; 8. Third sealing ring; 9. Mounting hole; 10. Top plate; 11. First threaded rod; 12. Second threaded rod; 13. Welded pipe; 14. Positioning groove; 15. Positioning rod; 16. Positioning plate; 17. Gasket mounting groove; 18. Auxiliary annular groove; 19. Positioning hole. Detailed Implementation

[0020] The technical solution of this utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1-4 As shown, the oil refining pipe sealing flange provided in this embodiment includes a first connecting flange 1 and a second connecting flange 2. Welded pipes 13 are provided on the outer side of both the first connecting flange 1 and the second connecting flange 2. The welded pipes 13 are used for welding connections with external oil pipelines.

[0022] Furthermore, auxiliary annular grooves 18 are provided on the outer sides of the opposite faces of the first connecting flange 1 and the second connecting flange 2. After the first connecting flange 1 and the second connecting flange 2 are combined and installed, the two auxiliary annular grooves 12 are combined into a large annular groove. Later, a rubber sealing ring with a certain elasticity can be used to cover and seal it, which further improves the sealing effect after the flanges are connected.

[0023] The inner surface of the first connecting flange 1 is provided with a first annular groove 3, a second annular groove 4, and a third annular groove 5 sequentially from the inside to the outside. The inner surface of the second connecting flange 2 is provided with a matching first sealing ring 6, a second sealing ring 7, and a third sealing ring 8 sequentially from the inside to the outside. The first annular groove 3 is a T-shaped annular groove. The first annular groove 3 is located on the inner ring of the first connecting flange 1. The first sealing ring 6 is located on the innermost ring of the second connecting flange 2 and is adapted to the shape of the T-shaped annular groove. By using the T-shaped structure of the first annular groove 3 and the T-shaped structure of the first sealing ring 6, when the first connecting flange 1 and the second connecting flange 2 are fixed, the first sealing ring 6 is gradually squeezed into the first annular groove 3 as the bolts are gradually tightened. The T-shaped structure allows the first sealing ring 6 to fit more and more tightly as it is squeezed into the first annular groove 3, thereby improving the sealing effect after the flanges are connected.

[0024] Furthermore, positioning holes 19 and positioning grooves 14 are respectively provided on the second annular groove 4 and the third annular groove 5. Positioning rods 15 and positioning plates 16 that are adapted to the positioning holes 19 and positioning grooves 14 are respectively provided on the second sealing ring 7 and the third sealing ring 8. When the first connecting flange 1 and the second connecting flange 2 are combined, the positioning holes 19, positioning grooves 14, positioning rods 15 and positioning plates 16 can play a foolproof role, ensuring that after the two flanges are positioned and installed, the mounting holes 9 on the two flanges can be accurately aligned, which is convenient for fixing them with bolts later.

[0025] Both the first connecting flange 1 and the second connecting flange 2 have several mounting holes 9 on their outer rings. A gasket mounting groove 17, which communicates with the mounting hole 9 and has a diameter larger than the mounting hole 9, is provided on the outer side of the mounting hole 9. The gasket mounting groove 17 is used to install a rubber sealing ring. When the first connecting flange 1 and the second connecting flange 2 are combined and fixed, the bolts for fixing the flange pass through the mounting holes 9 and are then fixed with nuts. The nuts are eventually wrapped by the rubber sealing ring installed in the gasket mounting groove 17. This not only improves the sealing effect after the flanges are connected, but also improves the anti-slip effect of the nuts.

[0026] Furthermore, a top plate 10 is provided above each mounting hole 9. A vertically arranged first threaded rod 11 is threaded onto the top plate 10, and a horizontally arranged second threaded rod 12 is threaded onto the first threaded rod 11. The top plate 10 has a first threaded hole for threaded installation with the first threaded rod 11, and a second threaded hole for threaded connection with the second threaded rod 12. Both the first threaded rod 11 and the second threaded rod 12 have handles at their outer ends. The handles facilitate the rotation of the first threaded rod 11 and the second threaded rod 12. After the two flanges are fixed together with bolts, the first threaded rod 11 is threaded into the first threaded hole, aligning the second threaded hole with the bolt position. Then, the second threaded rod 12 is threaded into the second threaded hole, pressing and fixing the outer end of the bolt. This effectively prevents the bolt from loosening and falling out later, further improving the stability of the two flanges and enhancing the sealing effect.

[0027] like Figures 1-4 As shown, the principle of the sealing flange for oil refining pipes provided in this embodiment is as follows:

[0028] When the first connecting flange 1 and the second connecting flange 2 are assembled, the positioning holes 19, positioning grooves 14, positioning rods 15, and positioning plates 16 ensure that the mounting holes 9 on the two flanges are accurately aligned after positioning and installation. During assembly, the first sealing ring 6 engages with the first annular groove 3, the second sealing ring 7 engages with the second annular groove 4, and the third sealing ring 8 engages with the third annular groove 5, forming a seal and improving the sealing effect after flange connection. Later, bolts pass through the mounting holes 9, and nuts are used for fixing. The nuts ultimately reside in the gasket mounting groove 17, and the installed rubber sealing rings... Wrapping the flanges together not only improves the sealing effect after connection but also enhances the anti-slip effect of the nuts. Then, the first threaded rod 11 is threaded into the first threaded hole, aligning the second threaded hole with the bolt position. Next, the second threaded rod 12 is threaded into the second threaded hole, pressing and fixing the outer end of the bolt to prevent it from loosening and falling off later, further improving the stability of the flange connection and enhancing the sealing effect. Finally, the two auxiliary annular grooves 12 are combined into a large annular groove, which is then sealed with an elastic rubber sealing ring, further improving the sealing effect after flange connection.

[0029] The foregoing description illustrates and describes preferred embodiments of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein. Any modifications and variations made by those skilled in the art without departing from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A flange for sealing oil refining pipes, characterized in that, The first connecting flange (1) and the second connecting flange (2) are provided with a first annular groove (3), a second annular groove (4) and a third annular groove (5) on the inner side of the first connecting flange (1) from the inside to the outside. The second connecting flange (2) is provided with a first sealing ring (6), a second sealing ring (7) and a third sealing ring (8) from the inside to the outside. The outer rings of the first connecting flange (1) and the second connecting flange (2) are provided with a number of mounting holes (9). A top plate (10) is provided above each mounting hole (9). A first threaded rod (11) is threaded inward on the top plate (10). A second threaded rod (12) is threaded inward on the first threaded rod (11).

2. The flange for petroleum refining pipe sealing according to claim 1, characterized by: Welded pipes (13) are provided on the outer side of both the first connecting flange (1) and the second connecting flange (2).

3. The flange for petroleum refining pipe sealing according to claim 1, characterized in that: The first annular groove (3) is a T-shaped annular groove. The first annular groove (3) is opened on the inner ring of the first connecting flange (1). The first sealing ring (6) is set on the innermost ring of the second connecting flange (2) and is adapted to the shape of the T-shaped annular groove.

4. The flange for sealing oil refining pipes according to claim 1, characterized in that: The second annular groove (4) and the third annular groove (5) are respectively provided with positioning holes (19) and positioning grooves (14), and the second sealing ring (7) and the third sealing ring (8) are respectively provided with positioning rods (15) and positioning plates (16) that are adapted to the positioning holes (19) and the positioning grooves (14).

5. The flange for sealing oil refining pipes according to claim 1, characterized in that: The top plate (10) has a first threaded hole for threaded installation with the first threaded rod (11), and the first threaded rod (11) has a second threaded hole for threaded connection with the second threaded rod (12).

6. The flange for sealing oil refining pipes according to claim 5, characterized in that: Both the first threaded rod (11) and the second threaded rod (12) have handles at their outer ends.

7. The flange for sealing oil refining pipes according to claim 1, characterized in that: A gasket mounting groove (17) is provided on the outside of the mounting hole (9) and is connected to the mounting hole (9) and has a diameter larger than the mounting hole (9). The gasket mounting groove (17) is used to install a rubber sealing ring.

8. The flange for sealing oil refining pipes according to claim 1, characterized in that: The outer sides of the opposite surfaces of the first connecting flange (1) and the second connecting flange (2) are provided with auxiliary annular grooves (18).

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