A welded inner lining flange

Abstract

This utility model discloses a welded inner-lined flange, comprising a convex socket flange joint, which includes a convex flange plate (11), a convex flange clamping boss (12), a convex flange inner liner tube (13), a convex flange chamfer (14), a convex flange boss (15), a convex flange end sealing face (16), a convex flange end sealing groove (17), and an end sealing line (18), and a concave socket flange joint, which includes a concave flange plate (21), a concave flange clamping boss (22), a concave flange inner liner tube (23), a concave flange chamfer (24), a concave flange end sealing face (25), a concave flange end sealing groove (26), and a concave flange groove (27). The assembly formed by the convex flange boss (15) and the convex flange inner liner tube (13) is inserted into the concave flange groove (27). The flange of this utility model can solve the problems of axial creep, loosening, and detachment of inner-lined pipes, and improve the overall service life of the pipes.

Description

Technical Field

[0001] The embodiments of this utility model belong to the technical field of pipe connection workpieces, and more specifically, relate to a welded inner lining flange. Background Technology

[0002] Welded lined flanges, as key pipe fittings, are widely used in chemical, petroleum, energy, and metallurgical industries. Their core function is to connect the pipe to the flange body through welding and to isolate the metal substrate from corrosive media through the lining material, thereby extending the service life of the pipeline system and ensuring its sealing performance. However, during use, the ultra-high molecular weight polyethylene (UHMWPE) lined pipes have insufficient adhesion and are prone to axial creep, which can lead to loosening and detachment.

[0003] Traditional lined pipes have a weak bond with the metal substrate. Under long-term mechanical vibration and axial creep caused by media scouring, the lining pipe is prone to loosening and falling off. At the same time, corrosive media can penetrate into the metal substrate, affecting the sealing performance. Summary of the Invention

[0004] To address the aforementioned deficiencies or improvement needs of existing technologies, this utility model provides a welded lined flange. By using inner liners for both convex and concave flanges, the corrosion resistance and sealing performance of the welded lined flange are improved. The chamfering of both convex and concave flanges optimizes the welding space, ensuring uniform weld coverage. The boss on the convex flange alters the gas path structure of the welded lined flange, further enhancing sealing performance. The installation of end seals at the end sealing grooves of both the convex and concave flanges solves the problems of axial creep, loosening, and detachment of the lined pipe, thereby improving the overall service life of the pipeline.

[0005] To achieve the above objectives, this utility model provides a welded inner lining flange, comprising:

[0006] A convex flange joint includes a convex flange, a convex flange liner that is tightly attached to the inner wall of the convex flange, and a convex flange boss that protrudes outward from the lower middle part of the inner side of the convex flange. The vertical side of the convex flange boss is the end face of the convex flange end seal. The inner end of the convex flange liner is bent toward the end face of the convex flange end seal and extends radially to form an L-shaped edging structure. The end face of the convex flange end seal is provided with a convex flange end seal structure to increase the friction between the convex flange liner and the end face of the convex flange end seal.

[0007] The concave flange joint includes a concave flange, a concave flange liner that is tightly attached to the inner wall of the concave flange, and a concave flange groove recessed inward on the inner side of the concave flange. The vertical side of the concave flange groove is the end face of the concave flange end seal. The inner end of the concave flange liner is bent toward the end face of the concave flange end seal and extends radially to form an L-shaped edging structure. The end face of the concave flange end seal is provided with a concave flange end seal structure for increasing the friction between the concave flange liner and the end face of the concave flange end seal.

[0008] The assembly formed by the convex flange boss and the convex flange inner liner is inserted into the recess of the concave flange.

[0009] Furthermore, the assembly formed by the convex flange boss and the convex flange inner liner is inserted into the recess of the concave flange at a depth of 1 / 2 to 1 / 4.

[0010] Furthermore, the flange end sealing structure consists of multiple protruding elastic friction bodies arranged in the circumferential direction of the flange end sealing end face.

[0011] Furthermore, the concave flange end sealing structure consists of multiple protruding elastic friction bodies arranged in the circumferential direction of the end face of the concave flange end sealing line.

[0012] Furthermore, the convex socket flange joint also includes a convex flange clamping boss located on the outside of the convex flange, and the concave socket flange joint also includes a concave flange clamping boss located on the outside of the concave flange.

[0013] Furthermore, a chamfer is provided on the upper inner side of the convex flange.

[0014] Furthermore, the upper inner side of the concave flange is provided with a concave flange chamfer.

[0015] Furthermore, the flange end sealing structure includes a plurality of flange end sealing grooves disposed on the end face of the flange end sealing line and an end sealing line disposed within the flange end sealing grooves.

[0016] Furthermore, the concave flange end sealing structure includes a plurality of concave flange end sealing grooves disposed on the end face of the concave flange end sealing line and an end sealing line disposed within the concave flange end sealing grooves.

[0017] Furthermore, the end seal is a sealing ring made of elastic material.

[0018] In summary, compared with the prior art, the above-described technical solution conceived by this utility model can achieve the following beneficial effects:

[0019] 1. The welded inner lining flange of this utility model improves the corrosion resistance and sealing performance of the welded inner lining flange by using the inner lining tube of the convex flange and the inner lining tube of the concave flange. The chamfering of the convex flange and the concave flange optimizes the welding space and ensures uniform coverage of the weld. The boss of the convex flange extends the medium leakage path, increases leakage resistance, and enhances the sealing performance of the flange after welding. By installing end seals at the end sealing grooves of the convex flange and the end sealing grooves of the concave flange, the problems of axial creep, loosening and falling off of the inner lining pipe are solved, thereby improving the overall service life of the pipeline.

[0020] 2. The welded inner lining flange of this utility model has a corresponding inner lining tube connected to the convex flange clamping boss surface of both the concave socket flange joint and the convex socket flange joint. The inner lining tube, as a protective layer, is in direct contact with the fluid medium, isolating corrosive substances from direct contact with the flange, thereby improving the corrosion resistance and sealing performance of the welded inner lining flange.

[0021] 3. The welded inner lining flange of this utility model has a convex flange boss on the convex socket flange joint, and corresponding end sealing grooves on both the concave socket flange joint and the convex socket flange joint. The grooves are opened on the end face of the corresponding end sealing line according to the design dimensions. Under the interaction of the six end sealing lines of the flange, the problems of axial creep, loosening and falling off of the inner lining pipe are solved, the overall service life of the pipe is improved, and the sealing performance of the pipe can also be improved. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the welded inner lining flange according to an embodiment of the present utility model;

[0023] Figure 2 This is a half-sectional view of the welded inner lining flange according to an embodiment of the present invention;

[0024] Figure 3 This is a partial view of the welded inner lining flange at point C, as shown in the embodiment of this utility model.

[0025] Figure 4 This is a half-sectional view of the flange joint with protruding socket according to an embodiment of the present utility model;

[0026] Figure 5 This is a partial view of the flange joint with protruding socket in an embodiment of this utility model at point A;

[0027] Figure 6 This is a half-sectional view of the recessed socket flange joint according to an embodiment of the present utility model;

[0028] Figure 7 This is a partial view of the recessed socket flange joint at point B, according to an embodiment of the present invention.

[0029] Figure 8 This is a half-sectional view of the welded inner lining flange according to an embodiment of the present utility model;

[0030] Figure 9 This is a partial view of the welded inner lining flange at point D, according to an embodiment of the present invention.

[0031] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-convex socket flange joint, 2-concave socket flange joint, 11-convex flange, 12-convex flange clamping boss, 13-convex flange inner liner, 14-convex flange chamfer, 15-convex flange boss, 16-convex flange end sealing face, 17-convex flange end sealing groove, 18-end sealing line, 21-concave flange, 22-concave flange clamping boss, 23-concave flange inner liner, 24-concave flange chamfer, 25-concave flange end sealing face, 26-concave flange end sealing groove, 27-concave flange groove. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] In the description of the embodiments of this utility model, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the embodiments of this utility model, "a plurality of" means at least two.

[0036] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] This utility model provides a welded inner lining flange. For example... Figure 1 , Figure 2 , Figure 3 As shown, it includes a convex socket flange joint 1 and a concave socket flange joint 2. The convex socket flange joint 1 is inserted into the concave socket flange joint 2 and welded and fixed according to the welding process.

[0038] Specifically, such as Figure 4 , Figure 5 As shown, the flange joint 1 includes a flange plate 11, a flange clamping boss 12, a flange inner liner 13, a flange chamfer 14, a flange boss 15, a flange end sealing face 16, a flange end sealing groove 17, and an end sealing line 18. The flange clamping boss 12 is fixed to the outer sidewall of the flange plate 11. The flange inner liner 13 is connected inside the flange plate 11 and the flange clamping boss 12. The inner end of the flange inner liner 13 extends radially outwards towards the flange end sealing face 16 to form an L-shaped edging structure. The flange inner liner 13 is made of ultra-high molecular weight polymer material, which can prevent the medium from entering the inner liner flange, improving the corrosion resistance and sealing performance of the welded inner liner flange. A flange chamfer 14 is opened at the upper inner side of the flange plate 11. The flange chamfer 14 optimizes the welding space and ensures uniform weld coverage. The flange boss 15 is located on the top of the flange 11. By inserting the flange boss 15 of the flange joint 1 into the recessed flange groove 27 of the flange joint 2, the leakage path of the medium is extended, the leakage resistance is increased, and the sealing performance after flange welding is enhanced. A flange end sealing face 16 is provided on the inner side of the flange 11. Three flange end sealing grooves 17 are opened in the lower part of the flange end sealing face 16. The end sealing line 18 is placed in the corresponding flange end sealing groove 17. The end sealing line 18 is an elastic sealing ring (e.g., rubber or silicone material can be used). By adding multiple end sealing lines 18 (e.g., 3 end sealing lines) on the flange end sealing face, the friction force between the inner lining pipe and the end sealing face is increased, thereby solving the problems of axial creep, loosening and falling off of the inner lining pipe, and thus improving the overall service life of the pipe.

[0039] Specifically, such as Figure 6 , Figure 7 As shown, the recessed socket flange joint includes a recessed flange 21, a recessed flange clamping boss 22, a recessed flange inner liner 23, a recessed flange chamfer 24, a recessed flange end sealing face 25, a recessed flange end sealing groove 26, and a recessed flange groove 27. The recessed flange clamping boss 22 is fixed to the outer sidewall of the recessed flange 21. The recessed flange inner liner 23 is connected inside the recessed flange 21 and the recessed flange clamping boss 22. The inner end of the recessed flange inner liner 23 extends radially outward from the recessed flange end sealing face 25 to form an L-shaped edging structure. The recessed flange inner liner 23 is made of ultra-high molecular weight polymer material, which can prevent the medium from entering the inner liner flange, thereby improving the corrosion resistance and sealing of the welded inner liner flange. For sealing, a chamfer 24 is provided on the upper inner side of the concave flange 21. The chamfer 24 optimizes the welding space and ensures uniform weld coverage. A concave flange end sealing face 25 is provided on the inner side of the concave flange 21. Three concave flange end sealing grooves 26 are provided in the lower part of the concave flange end sealing face 25. The end sealing line 18 is placed in the corresponding concave flange end sealing groove 26. The end sealing line 18 is an elastic sealing ring. By adding multiple end sealing lines 18 (e.g., 3 end sealing lines) on the flange end sealing face, the friction force between the inner lining pipe and the end sealing face is increased, thereby solving the problems of axial creep, loosening and falling off of the inner lining pipe, and thus improving the overall service life of the pipe.

[0040] As a preferred embodiment, in some other embodiments, the vertical sides of both the convex flange liner 13 and the concave flange liner (23) are provided with a textured structure to increase friction. The textured structure includes multiple textures distributed along the axial and / or circumferential direction of the liner. The textures are rectangular, with a depth of 0.1mm-0.5mm and a spacing of 0.5mm-1mm between adjacent textures. This effectively prevents the liner from moving in the axial and radial directions, enhances the bonding strength between the liner and the flange body, prevents the liner from loosening and falling off, and improves the overall sealing performance and service life of the pipeline.

[0041] As a preferred embodiment, in some other embodiments, the chamfer angles of the flange chamfer 14 and the concave flange chamfer 24 are 15°-50°, and the ends of the flange chamfer 14 and the concave flange chamfer 24 are also provided with a small rounded transition, the radius of which is 0.5mm-1.5mm, to avoid stress concentration.

[0042] like Figure 2 , Figure 8 As shown, after inserting the convex flange 1 into the concave flange 2, the convex flange boss 15 enters one-third of the concave flange 2 and leaves two-thirds of the space between it and the concave flange groove 27. Through the "less convex and more concave" welding inner lining flange design, it plays a role in preventing the hot melt welding slag medium from entering the inner lining layer.

[0043] like Figure 3 As shown, the end sealing groove 17 of the convex flange is used to install the end sealing line 18. The end sealing line 18 is an elastic sealing ring. By adding multiple end sealing lines 18 (e.g., 3 end sealing lines) on the end face of the flange end sealing line, the friction force between the inner liner tube 13 of the convex flange and the end face 16 of the convex flange end sealing line is increased, thereby solving the problems of axial creep, loosening and falling off of the inner liner tube 13 of the convex flange, and thus improving the overall service life of the pipeline. The function of the end sealing groove 26 of the concave flange is the same as that of the end sealing groove 17 of the convex flange.

[0044] In another embodiment of this utility model, the working method of welding the inner lining flange is as follows:

[0045] Select a pipe with a raised and recessed flange joint, align the center of the raised and recessed flange joints to ensure concentricity of the pipe, and insert the raised flange joint into the recessed flange joint.

[0046] Use external clamping tools to place on the clamping bosses of the convex flange and the clamping bosses of the concave flange, and gradually apply force to clamp the convex flange joint. When clamping, each contact point should be subjected to force synchronously and evenly to ensure a tight internal connection.

[0047] After the concave-convex flange joint is clamped, flame-retardant fiberglass cloth is used to fill the gap to prevent welding molten metal from damaging the pipeline during subsequent welding.

[0048] Adjust the welding machine current to the set value and perform spot welding, using a small current for multiple welds.

[0049] Cooling measures should be taken around the welding area to prevent the temperature from getting too high. Physical cooling methods such as using a damp cloth can be used to cover the non-welding contact area.

[0050] The welding process adopts a downward welding process, and a semi-automatic welding machine is used to weld the flange. It is required to ensure that the weld appearance is qualified, and the weld is full and smooth.

[0051] By following the above working method, the welding work of pipes with concave-convex socket flange joints can be completed.

[0052] In summary, this welded inner-lined flange can solve the problems of axial creep, loosening, and detachment in inner-lined pipes, improve the overall service life of the pipes, and also enhance the sealing performance of the pipes.

[0053] Those skilled in the art will readily understand that the above description is merely 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 welded inner liner flange characterized by, include: A flange joint (1) includes a flange (11), a flange inner liner (13) that is close to the inner wall of the flange (11), and a flange boss (15) that protrudes outward from the lower middle part of the inner side of the flange (11). The vertical side of the flange boss (15) is the flange end sealing face (16). The inner end of the flange inner liner (13) is bent toward the flange end sealing face (16) and extends radially to form an L-shaped edging structure. The flange end sealing face (16) is provided with a flange end sealing structure for increasing the friction between the flange inner liner (13) and the flange end sealing face (16). And a recessed socket flange joint (2), which includes a recessed flange (21), a recessed flange liner (23) that is close to the inner wall of the recessed flange (21), and a recessed flange groove (27) that is recessed inward on the inner side of the recessed flange (21); the vertical side of the recessed flange groove (27) is the recessed flange end sealing face (25), the inner end of the recessed flange liner (23) is bent toward the recessed flange end sealing face (25) and extends in the radial direction to form an L-shaped edging structure, and the recessed flange end sealing face (25) is provided with a recessed flange end sealing structure for increasing the friction between the recessed flange liner (23) and the recessed flange end sealing face (25); The assembly formed by the flange boss (15) and the flange inner liner (13) is inserted into the recessed flange groove (27).

2. The welded inner lining flange according to claim 1, characterized in that, The assembly formed by the flange boss (15) and the flange inner liner (13) is inserted into the recessed flange groove (27) at a depth of 1 / 2 to 1 / 4.

3. A welded inner lining flange according to claim 1, characterized in that, The flange end sealing structure consists of multiple protruding elastic friction bodies arranged in the circumferential direction of the flange end sealing end face (16).

4. A welded inner lining flange according to claim 1, characterized in that, The concave flange end sealing structure consists of multiple protruding elastic friction bodies arranged in the circumferential direction of the concave flange end sealing end face (25).

5. A welded inner lining flange according to claim 1, characterized in that, The convex socket flange joint (1) further includes a convex flange clamping boss (12) located on the outside of the convex flange (11), and the concave socket flange joint (2) further includes a concave flange clamping boss (22) located on the outside of the concave flange (21).

6. A welded inner lining flange according to claim 1, characterized in that, The upper inner side of the convex flange (11) is provided with a convex flange chamfer (14).

7. A welded inner lining flange according to claim 1, characterized in that, The inner upper end of the concave flange (21) is provided with a concave flange chamfer (24).

8. A welded inner lining flange according to any one of claims 1-7, characterized in that, The flange end sealing structure includes a plurality of flange end sealing slots (17) disposed on the flange end sealing end face (16) and an end sealing line (18) disposed in the flange end sealing slots (17).

9. A welded inner lining flange according to any one of claims 1-7, characterized in that, The concave flange end sealing structure includes a plurality of concave flange end sealing grooves (26) disposed on the end face (25) of the concave flange end sealing line and an end sealing line (18) disposed in the concave flange end sealing grooves (26).

10. A welded inner lining flange according to claim 9, characterized in that, The end seal (18) is a sealing ring made of elastic material.

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