Flange connecting structure

Abstract

The utility model relates to the technical field of pipe connection, in particular to a flange connection structure which comprises a first flange plate, a second flange plate, a sealing ring, a first butt welding ring matched with the first flange plate and a second butt welding ring matched with the second flange plate. The sealing ring is arranged between the first butt welding ring and the second butt welding ring; the section of the first butt welding ring and the section of the second butt welding ring are respectively in a circular ring shape, the opposite sides of the first butt welding ring and the second butt welding ring are respectively provided with a locating convex ring and a locating concave ring which are matched with each other, and the locating concave ring and the locating convex ring are respectively arranged on the inner side of the sealing ring. Through the connecting structure, the problem that quick and accurate butt joint cannot be achieved can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe connection, in particular to a flange connection structure. Background Art

[0002] When pipes are connected via flange sealing rings, bolts are typically used to apply pressure to the two flanges, utilizing the deformation of the sealing ring between the two flanges to achieve a seal. This solution has the following drawbacks: ① The flange hole is generally larger than the connecting bolt (for example, an M16 bolt has a flange hole of Φ18), which inevitably creates a certain degree of misalignment during connection, resulting in transitional steps and dead angles, increasing flow resistance. ② The flanges are connected by crimping flat sealing rings, which create a significant transitional step. Because the sealing ring is movable during crimping, improper operation by the worker can lead to significant eccentricity of the sealing ring, which not only increases flow resistance but also poses a certain risk of leakage, placing higher operational requirements on the worker.

[0003] In the prior art, a Chinese invention patent document with publication number CN103807531A and publication date May 21, 2014 is proposed to solve the above-mentioned technical problems. The technical solution disclosed in the patent document is as follows: a loose metal sealing flange, comprising: a first metal pipe, a loose flange, a slip-on flange blade, a metal sealing ring, an inner welding flange, and a second metal pipe, wherein the inner diameter of the loose flange is sleeved on the outer wall of the first metal pipe, and one ring end of the first metal pipe is connected to a concave platform on one side of the slip-on flange blade. The cutting edge of the slip-on flange is placed in the concave platform of the loose flange, the metal sealing ring is located between the cutting edge of the slip-on flange and the inner welding flange, the inner diameter of the inner welding flange is sleeved on the outer wall of the second metal pipe, and one ring end of the second metal pipe is connected to the concave platform of the inner welding flange. The cutting edge of the slip-on flange is a circular ring structure, and a concave ring part, a blade and a positioning part are arranged in sequence along the radial direction on the other side of the cutting edge of the slip-on flange. The blade is located between the concave ring part and the positioning part. The concave ring part is arranged at a position close to the center of the circular ring structure, and the positioning part is arranged at a position away from the center of the circular ring structure.

[0004] During actual use of the above technical solution, the following problems may occur: during the docking of the two flanges, rapid and accurate docking cannot be guaranteed, and the docking efficiency and effect are relatively poor. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention proposes a flange connection structure, which can effectively solve the problem of not being able to quickly and accurately connect, and requires little or no structural improvement of the flange.

[0006] The utility model is realized by adopting the following technical solutions:

[0007] A flange connection structure includes a first flange plate, a second flange plate, a sealing ring, a first pair of welding rings matching the first flange plate, and a second pair of welding rings matching the second flange plate; the sealing ring is arranged between the first pair of welding rings and the second pair of welding rings; the cross-sections of the first pair of welding rings and the second pair of welding rings are respectively annular, and matching positioning convex rings and positioning concave rings are respectively provided on opposite sides of the first pair of welding rings and the second pair of welding rings, and the positioning concave rings and positioning convex rings are respectively arranged on the inner sides of the sealing rings.

[0008] The matching surface between the positioning convex ring and the positioning concave ring is an inclined surface, and the positioning convex ring and the positioning concave ring are respectively connected to the inner ring walls of the first pair of welding rings and the second pair of welding rings.

[0009] The first pair of welding rings and the second pair of welding rings are further provided with bosses for welding the pipes on one side thereof.

[0010] The first flange and the second flange are respectively provided with matching grooves matching the bosses.

[0011] The outer facade of the boss is in a slope shape.

[0012] The remaining width of the end face of the boss is no more than twice the wall thickness of the pipe.

[0013] Step-shaped positioning through holes are provided in the first pair of welding rings and the second pair of welding rings.

[0014] The first pair of welding rings and the second pair of welding rings are also provided with grooves matching the sealing rings.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. In the present invention, the structures for sealing and positioning are both provided on the first pair of welding rings and the second pair of welding rings, and there is no need for a complicated structural design on the flange. The present invention is applicable to common flanges and has higher adaptability.

[0017] The provision of the convex and concave positioning rings ensures that the first and second welding rings can be quickly and accurately butted together, ensuring that the butt joint surfaces are concentric and gap-free. Furthermore, the convex and concave positioning rings also provide a certain sealing effect, and when used in conjunction with the sealing ring, the overall sealing effect can be enhanced.

[0018] 2. The mating surface between the positioning convex ring and the positioning concave ring is an inclined surface, which has a better docking effect; the positioning convex ring and the positioning concave ring are respectively connected to the inner ring wall of the first pair of welding rings and the second pair of welding rings, which can better ensure the sealing effect.

[0019] 3. The setting of the boss can ensure the aesthetic appearance and sealing of the pipe and the corresponding first and second pairs of welding rings after welding.

[0020] 4. The first flange and the second flange are respectively provided with matching grooves matching the boss, so that the docking of the first flange and the first pair of welding rings, the second flange and the second pair of welding rings can be completed faster and more accurately, and the matching effect of the first flange and the first pair of welding rings, the second flange and the second pair of welding rings can be improved, and a certain protective effect can be provided for the boss.

[0021] 5. By limiting the external shape of the boss and the remaining width of the end face, the welding work with the pipe can be completed better, and the aesthetics and sealing after welding can be guaranteed.

[0022] 6. The setting of the stepped positioning through-hole makes it possible to locate the position of the pipe inserted into the positioning through-hole of the welding ring, ensuring the positioning effect during welding and the concentricity of the welding without misalignment.

[0023] 7. The setting of the groove makes the deformation and position of the sealing ring completely determined by the groove size, so that the sealing ring will not move or wrinkle, and the operation is more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of the utility model after disassembly;

[0026] Figure 2 This is a schematic diagram of the structure of the utility model after connection;

[0027] Markings in the figure:

[0028] 1. First flange, 2. Second flange, 3. Sealing ring, 4. First pair of welding rings, 5. Second pair of welding rings, 6. Positioning convex ring, 7. Positioning concave ring, 8. Boss, 9. Matching groove, 10. Groove, 11. Pipe. DETAILED DESCRIPTION

[0029] Example 1

[0030] As a basic embodiment of the present invention, the present invention comprises a flange connection structure, comprising a first flange 1, a second flange 2, a sealing ring 3, a first pair of welding rings 4 mating with the first flange 1, and a second pair of welding rings 5 ​​mating with the second flange 2. The sealing ring 3 is disposed between the first pair of welding rings 4 and the second pair of welding rings 5. The first and second pairs of welding rings 4 and 5 each have a circular cross-section with a through hole defined in the middle. The pipe 11 is inserted into each through hole and welded to the first and second pairs of welding rings 4 and 5.

[0031] In this embodiment, the provision of the first and second pairs of welding rings 4 and 5 eliminates the need for structural modifications to the first and second flanges 1 and 2. Specifically, to improve the accuracy and speed of the docking of the first and second pairs of welding rings 4 and 5, matching positioning protruding rings 6 and recessed rings 7 are provided on opposing sides of the first and second pairs of welding rings 4 and 5, respectively. These recessed and protruding rings 7 and 6 are positioned on the inner side of the sealing ring 3, i.e., near the through-hole. The cross-sections of the positioning protruding and recessed rings 6 and 7 can be square or arc-shaped.

[0032] Example 2

[0033] As a preferred embodiment of the present invention, the present invention includes a flange connection structure, comprising a first flange 1, a second flange 2, a sealing ring 3, a first pair of welding rings 4, and a second pair of welding rings 5. The first pair of welding rings 4 and the second pair of welding rings 5 ​​each have a circular cross-section. The flange holes on the first and second flanges 1 and 2 communicate with the through holes in the first and second pairs of welding rings 4 and 5, and the flange holes and through holes respectively mate with a pipe 11.

[0034] The first flange 1 is provided with positioning grooves that match the first pair of welding rings 4, and the second flange 2 is also provided with positioning grooves that match the second pair of welding rings 5. The design of these positioning grooves allows for quick and accurate docking of the first flange 1 with the first pair of welding rings 4, and the second flange 2 with the second pair of welding rings 5. After docking, the first and second pairs of welding rings 4 and 5 can be respectively inserted into their corresponding positioning grooves.

[0035] The sealing ring 3 is disposed between the first pair of welding rings 4 and the second pair of welding rings 5. To improve the accuracy of the docking of the first and second pair of welding rings 4, 5, a matching positioning convex ring 6 and a positioning concave ring 7 are provided on opposite sides of the first and second pair of welding rings 4, 5, respectively. The positioning concave ring 7 and the positioning convex ring 6 are respectively disposed on the inner side of the sealing ring 3. More specifically, the mating surface between the positioning convex ring 6 and the positioning concave ring 7 is an inclined surface, and the positioning convex ring 6 and the positioning concave ring 7 are respectively connected to the inner ring walls of the first and second pair of welding rings 4, 5.

[0036] In this embodiment, only positioning grooves need to be provided on the first flange 1 and the second flange 2 , which requires little structural improvement to the existing first flange 1 and the second flange 2 and facilitates the processing of the new first flange 1 and the second flange 2 .

[0037] Example 3

[0038] As another preferred embodiment of the present invention, the present invention includes a flange connection structure, comprising a first flange 1, a second flange 2, a sealing ring 3, a first pair of welding rings 4 mating with the first flange 1, and a second pair of welding rings 5 ​​mating with the second flange 2. The sealing ring 3 is disposed between the first pair of welding rings 4 and the second pair of welding rings 5. The first and second pairs of welding rings 4, 5 each have a circular cross-section. The first and second pairs of welding rings 4, 5 are provided with matching positioning protruding rings 6 and concave positioning rings 7 on opposing sides, respectively. The concave positioning rings 7 and the positioning protruding rings 6 are disposed on the inner side of the sealing ring 3.

[0039] In order to ensure the aesthetic appearance and sealing of the pipe 11 after welding with the corresponding first pair of welding rings 4 and second pair of welding rings 5, a boss 8 for welding the pipe 11 is provided at the welding point of the pipe 11, that is, on the side of the first pair of welding rings 4 and the second pair of welding rings 5 ​​close to the pipe 11.

[0040] Example 4

[0041] As the best embodiment of this utility model, refer to the attached Figure 1 and instructions attached Figure 2 The present invention includes a flange connection structure comprising a first flange 1, a second flange 2, a sealing ring 3, a first pair of welding rings 4, and a second pair of welding rings 5. The first and second pair of welding rings 4 and 5 each have an annular cross-section and are provided with stepped positioning holes. The positioning holes include a first hole matching the outer diameter of a pipe 11 and a second hole matching the inner diameter of the pipe 11, allowing the pipe 11 to be inserted into the positioning holes and positioning the insertion position of the pipe 11. After the pipe 11 is inserted into the corresponding first and second pair of welding rings 4 and 5, to improve the welding effect between the pipe 11 and the corresponding first and second pair of welding rings 4 and 5, that is, to ensure the aesthetic appearance and sealing after welding, bosses 8 for welding the pipe 11 are provided at the weld points between the first and second pair of welding rings 4 and 5, i.e., on the side of the first and second pair of welding rings 4 and 5 that is closer to the pipe 11. Preferably, the outer facade of the boss 8 is in the shape of an inclined surface, and the remaining width L of the end face of the boss 8 does not exceed twice the wall thickness of the tube 11.

[0042] To improve the docking effect between the first pair of welding rings 4 and the first flange 1, and to improve the docking effect between the second pair of welding rings 5 ​​and the second flange 2, matching grooves 9 that match the bosses 8 can be provided on the first and second flanges 1, 2, respectively. Furthermore, to improve the docking effect between the first and second pair of welding rings 4, 5, matching positioning protruding rings 6 and positioning concave rings 7 are provided on opposite sides of the first and second pair of welding rings 4, 5, respectively. Specifically, the mating surface between the positioning protruding rings 6 and the positioning concave rings 7 is an inclined surface, and the positioning protruding rings 6 and the positioning concave rings 7 are connected to the inner ring walls of the first and second pair of welding rings 4, 5, respectively. Through the above-mentioned structural improvements, accurate docking can be ensured, and the docking surfaces are concentric and gap-free.

[0043] The sealing ring 3 is arranged between the first pair of welding rings 4 and the second pair of welding rings 5. In order to fix the placement of the sealing ring 3 so that the sealing ring 3 can be completely embedded and positioned without displacement or wrinkling, the first pair of welding rings 4 and the second pair of welding rings 5 ​​are further provided with grooves 10 that match the sealing ring 3.

[0044] Through the above structure, a smooth transition during connection can be achieved, flow resistance is reduced, and the overall resistance is reduced by more than 20%; and the requirements for manual technology are reduced.

[0045] To sum up, after reading the utility model document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the utility model without creative mental labor, which all fall within the scope of protection of the utility model.

Claims

1. A flange connection structure, comprising a first flange (1), a second flange (2), a sealing ring (3), and a first pair of welding rings (4) matched with the first flange (1), characterized in that: It also includes a second pair of welding rings (5) matched with the second flange (2); the sealing ring (3) is arranged between the first pair of welding rings (4) and the second pair of welding rings (5); the cross-sections of the first pair of welding rings (4) and the second pair of welding rings (5) are respectively annular, and the first pair of welding rings (4) and the second pair of welding rings (5) are respectively provided with matching positioning convex rings (6) and positioning concave rings (7) on opposite sides, and the positioning concave rings (7) and the positioning convex rings (6) are respectively arranged on the inner sides of the sealing ring (3).

2. A flange connection structure according to claim 1, characterized in that: The mating surface between the positioning convex ring (6) and the positioning concave ring (7) is an inclined surface, and the positioning convex ring (6) and the positioning concave ring (7) are respectively connected to the inner ring walls of the first pair of welding rings (4) and the second pair of welding rings (5).

3. The flange connection structure according to claim 1, characterized in that: The first pair of welding rings (4) and the second pair of welding rings (5) are further provided with bosses (8) on the side close to the pipe (11) for welding the pipe (11).

4. The flange connection structure according to claim 3, characterized in that: The first flange (1) and the second flange (2) are respectively provided with matching grooves (9) that match the bosses (8).

5. A flange connection structure according to claim 3 or 4, characterized in that: The outer facade of the boss (8) is in the shape of an inclined plane.

6. The flange connection structure according to claim 5, characterized in that: The remaining width of the end face of the boss (8) does not exceed twice the wall thickness of the tube (11).

7. The flange connection structure according to claim 3, characterized in that: Step-shaped positioning through holes are provided in the first pair of welding rings (4) and the second pair of welding rings (5).

8. The flange connection structure according to claim 7, characterized in that: The first pair of welding rings (4) and the second pair of welding rings (5) are also provided with grooves (10) that match the sealing rings (3).

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