Pipe flange and butt joint

Abstract

The utility model discloses a pipeline flange flanging joint relates to pipeline joint field, including flanging joint main part, the flanging joint main part welding is in the pipeline end, the flanging joint main part outer wall is equipped with the positioning groove and extrusion flange, the flanging joint main part end is equipped with the sealing washer, the flanging joint main part outer wall sliding installation has first flange and second flange, first flange and second flange outer wall all are seted up with bolt hole, and the fixed bolt is installed with the thread in bolt hole, first flange outer wall is equipped with the protective sleeve, and the first flange is equipped with the guide structure between second flange. The pipeline flange flanging joint, has improved the sealing performance of two groups of joint connecting place obviously, effectively avoids medium leakage, is especially applicable to the conveying scene of high pressure, flammable and explosive or corrosive medium, has reduced the security risk, has reduced the alignment difficulty of bolt hole when flange butt joint greatly with the aid of guide structure, reduces the operation of repeated adjustment, has shortened the installation work time.

Description

Technical Field

[0001] This utility model relates to the field of pipe joint technology, specifically a pipe flange flange joint. Background Technology

[0002] Pipe flange joints are a special type of detachable joint used in pipe connections. They are mainly used to connect metal pipes to flanges. By flanging the pipe ends, the pipe and flange are tightly fitted together, thus achieving sealing and connection functions.

[0003] In the prior art, Chinese Patent No. CN208196014U discloses a tooling for preventing welding deformation of a pulp line pipe, including a first flange ring for connecting the front side of the flange on the pulp line pipe flange joint, a second flange ring for connecting the back side of the flange, and bolts and nuts for fixing the first flange ring, the flange on the flange joint, and the second flange ring together. The first flange ring and the second flange ring are respectively provided with bolt holes in corresponding positions. The bolts are installed in the bolt holes and fixed with nuts, which can effectively reduce the deformation of the pulp line pipe and the flange joint during welding, improve the flatness of the flange on the flange joint, and provide a good sealing effect after the pulp line pipe is connected.

[0004] Based on the above information, existing pipe flange joints typically exhibit poor sealing performance at the connection point between the two sets of joints, making them highly susceptible to leaks and medium leakage. This is especially problematic when transporting high-pressure, flammable, explosive, or corrosive media, directly posing a serious safety hazard and threatening the production environment and personnel safety. Furthermore, aligning the bolt holes during flange assembly is challenging, requiring repeated adjustments. This not only prolongs installation time and increases the complexity of the installation process but also impacts the overall construction progress. Therefore, further improvements are needed. Utility Model Content

[0005] The purpose of this utility model is to provide a pipe flange flange joint to solve the problems mentioned in the background art, which are that the sealing performance at the connection of the two sets of joints of the existing pipe flange flange joints is usually poor, which is prone to sealing failure and medium leakage. Especially when transporting high pressure, flammable, explosive or corrosive media, it will directly turn into a serious safety hazard and threaten the production environment and personnel safety. On the other hand, the alignment of bolt holes during flange docking is difficult and requires repeated adjustment of alignment, which not only prolongs the installation time and increases the operation complexity of the installation process, but also affects the overall construction progress.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pipe flange flange joint, comprising a flange joint body, the flange joint body being welded to the end of a pipe, the outer wall of the flange joint body being provided with a positioning groove and an extrusion flange, the end of the flange joint body being provided with a sealing gasket, a first flange and a second flange being slidably installed on the outer wall of the flange joint body, both the outer walls of the first flange and the second flange being provided with bolt holes, and fixing bolts being installed with internal threads in the bolt holes, a protective sleeve being provided on the outer wall of the first flange, and a guide structure being provided between the first flange and the second flange.

[0007] Furthermore, the flanged joint body is symmetrically arranged with two sets of positioning grooves, the positioning grooves are trapezoidal in cross-section and are annular in overall design, the extrusion flanges are evenly spaced and the diameter of the extrusion flanges gradually increases along the radial direction of the flanged joint body, and the outer wall of the extrusion flanges fits against the outer wall of the sealing gasket.

[0008] Furthermore, the sealing gasket is located between the two sets of flanged joint bodies, and the sealing gasket covers the end of the flanged joint body. The outer wall of the sealing gasket is provided with a positioning protrusion, and the positioning protrusion is designed in a ring shape. The cross-section of the positioning protrusion is trapezoidal, and the outer wall of the positioning protrusion is in contact with the inner wall of the positioning groove.

[0009] Furthermore, the protective sleeve and the first flange have a U-shaped cross-section, and the inner diameter of the protective sleeve is larger than the outer diameter of the second flange. A sealing ring is provided between the protective sleeve and the second flange, and the protective sleeve wraps around the second flange.

[0010] Furthermore, the bolt holes are opened at equal angles, and the first flange and the second flange are connected by fixing bolts.

[0011] Furthermore, the guide structure includes a guide block disposed on the outer wall of the first flange, a guide groove is provided on the outer wall of the second flange, and a through hole for a fixing bolt to pass through is provided at the center of the guide block.

[0012] Furthermore, the guide block is designed in a circular shape, and the guide block is set at an equal angle between the first flange and the second flange. The length of the guide block is greater than the distance between the first flange and the second flange, and the corner of the guide block away from the first flange is designed at an angle. The diameter of the guide groove is greater than the diameter of the bolt hole, and the inner wall of the guide groove fits against the outer wall of the end of the guide block.

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

[0014] 1. This pipe flange flange joint, through the trapezoidal structure of the positioning groove and the positioning protrusion, and the tight compression of the sealing gasket by the extrusion flange, significantly improves the sealing performance at the connection of the two sets of joints. The fit design of the positioning groove and the positioning protrusion can quickly achieve accurate positioning of the sealing gasket, while the radial pressure generated by the extrusion flange during the flange tightening process can make the sealing gasket deform evenly and tightly fill the gap, effectively avoiding media leakage. It is especially suitable for conveying high-pressure, flammable, explosive or corrosive media, reducing safety hazards.

[0015] 2. By utilizing the cooperation between the guide block and the guide groove in the guide structure, the difficulty of aligning bolt holes during flange docking is greatly reduced; the circular design and beveled end of the guide block facilitate insertion into the guide groove, and its length, which is greater than the distance between the two flanges, can achieve pre-positioning in the early stage of docking, reducing repeated adjustments, shortening installation time, reducing operational complexity, and thus accelerating the overall construction progress; at the same time, the guide blocks distributed at equal angles cooperate with the bolt holes to ensure uniform stress on the flange and improve connection stability.

[0016] 3. The combination design of the protective sleeve and the sealing ring not only provides physical protection by wrapping the second flange to prevent direct corrosion of the flange connection by the external environment, but also further enhances the sealing between the protective sleeve and the second flange through the sealing ring. This prevents moisture, dust and other impurities from entering the bolt connection area and causing rust or contamination, thus extending the service life of the joint and improving the overall durability of the structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the first flange, protective sleeve, and guide block of this utility model;

[0019] Figure 3 This is a schematic diagram of the main structure of the second flange, guide groove, and flanged joint of this utility model;

[0020] Figure 4 This is a schematic cross-sectional view of the main body structure of the first flange, the second flange, and the flanged joint of this utility model;

[0021] Figure 5 This is a schematic diagram of the main body and sealing gasket structure of the flanged joint of this utility model;

[0022] Figure 6 This is a schematic diagram of the second flange, bolt holes, and guide groove structure of this utility model.

[0023] In the figure: 1. Flanged joint body; 101. Positioning groove; 102. Extrusion flange; 2. Sealing gasket; 201. Positioning protrusion; 3. First flange; 301. Guide block; 302. Protective sleeve; 4. Second flange; 401. Guide groove; 5. Bolt hole; 6. Sealing ring; 7. Fixing bolt. Detailed Implementation

[0024] 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.

[0025] Example 1: Please refer to Figures 1-6 The present invention provides the following technical solution: a pipe flange flange joint, including a flange joint body 1, which is welded to the end of the pipe. The outer wall of the flange joint body 1 is provided with a positioning groove 101 and an extrusion flange 102. The end of the flange joint body 1 is provided with a sealing gasket 2. A first flange 3 and a second flange 4 are slidably installed on the outer wall of the flange joint body 1. Bolt holes 5 are opened on the outer walls of the first flange 3 and the second flange 4, and fixing bolts 7 are installed in the internal threads of the bolt holes 5. A protective sleeve 302 is provided on the outer wall of the first flange 3.

[0026] like Figures 1-5 As shown, the flanged joint body 1 is symmetrically arranged with two sets of positioning grooves 101. The positioning groove 101 has a trapezoidal cross section and the positioning groove 101 is annular in shape. The extrusion flanges 102 are arranged at equal intervals, and the diameter of the extrusion flanges 102 gradually increases radially along the flanged joint body 1. The outer wall of the extrusion flanges 102 is in contact with the outer wall of the sealing gasket 2.

[0027] like Figure 1 , Figure 4 and Figure 5 As shown, the sealing gasket 2 is located between the two sets of flanged joint bodies 1, and the sealing gasket 2 covers the end of the flanged joint body 1. The outer wall of the sealing gasket 2 is provided with a positioning protrusion 201, and the positioning protrusion 201 is designed in a ring shape. The cross-section of the positioning protrusion 201 is trapezoidal, and the outer wall of the positioning protrusion 201 fits against the inner wall of the positioning groove 101.

[0028] like Figures 1-6 As shown, the protective sleeve 302 and the first flange 3 have a U-shaped cross section, and the inner diameter of the protective sleeve 302 is larger than the outer diameter of the second flange 4. A sealing ring 6 is provided between the protective sleeve 302 and the second flange 4. The protective sleeve 302 wraps around the second flange 4. The bolt holes 5 are opened at equal angles, and the first flange 3 and the second flange 4 are connected by fixing bolts 7.

[0029] During the overall installation, the first flange 3 and the second flange 4 are first installed on the outer walls of the two sets of flanged joint bodies 1, respectively. Then, the two sets of flanged joint bodies 1 are welded to the ends of the pipes to be connected, ensuring the sealing and stability of the welded position. Next, the sealing gasket 2 is placed between the two sets of flanged joint bodies 1, so that the positioning protrusion 201 on the outer wall of the sealing gasket 2 mates with the positioning groove 101 on the outer wall of the flanged joint body 1. The trapezoidal structure of the positioning groove 101 and the positioning protrusion 201 ensures precise positioning of the sealing gasket 2. Then, the position is adjusted so that the bolt holes 5 on the first flange 3 and the second flange 4 align. Finally, the fixing bolts 7 are used to secure the gasket. The first flange 3 and the second flange 4 are connected through the bolt hole 5. During the tightening of the fixing bolt 7, the extrusion flange 102 on the flanged joint body 1 will generate radial pressure on the sealing gasket 2. Since the diameter of the extrusion flange 102 gradually increases along the radial direction of the flanged joint body 1 and is set at equal intervals, the sealing gasket 2 deforms uniformly under pressure, tightly filling the gap between the two sets of flanged joint bodies 1, significantly improving the sealing performance. At the same time, the protective sleeve 302 on the outer wall of the first flange 3 will wrap the second flange 4. The sealing ring 6 between the protective sleeve 302 and the second flange 4 further enhances the sealing performance, prevents external impurities from entering, and completes the overall installation.

[0030] Example 2: Please refer to Figures 1-6 Based on Embodiment 1, a guide structure is also disclosed, the specific structure of which is as follows: a guide structure is provided between the first flange 3 and the second flange 4. The guide structure includes a guide block 301 disposed on the outer wall of the first flange 3, a guide groove 401 provided on the outer wall of the second flange 4, a through hole for the fixing bolt 7 to pass through the center of the guide block 301, the guide block 301 is designed in a circular shape, and the guide block 301 is set at an equal angle between the first flange 3 and the second flange 4. The length of the guide block 301 is greater than the distance between the first flange 3 and the second flange 4, and the corner of the guide block 301 away from the first flange 3 is designed at an angle. The diameter of the guide groove 401 is greater than the diameter of the bolt hole 5, and the inner wall of the guide groove 401 is in contact with the outer wall of the end of the guide block 301.

[0031] When the first flange 3 and the second flange 4 are connected, the guide block 301 on the outer wall of the first flange 3 will first contact the guide groove 401 on the outer wall of the second flange 4. The guide block 301 is designed in a circular shape, and the corner away from the first flange 3 is designed at an angle, which facilitates the smooth insertion of the guide block 301 into the guide groove 401. Since the length of the guide block 301 is greater than the distance between the first flange 3 and the second flange 4, the pre-positioning of the two flanges can be achieved in the initial stage of connection. The guide block 301 is set at an equal angle between the first flange 3 and the second flange 4, and the diameter of the guide groove 401 is greater than the diameter of the bolt hole 5. The outer wall of the end of the guide block 301 fits against the inner wall of the guide groove 401, which can guide the first flange 3 and the second flange 4 to accurately connect, so that the bolt hole 5 can be quickly aligned, reducing the operation of repeated adjustment. When connected by fixing bolts 7, the through hole at the center of the guide block 301 allows the fixing bolt 7 to pass through. The guide blocks 301 distributed at equal angles cooperate with the bolt holes 5 to ensure that the flange is subjected to uniform force and improve the connection stability.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pipe flange flange joint, comprising a flange joint body (1), wherein the flange joint body (1) is welded to the end of a pipe, characterized in that: The outer wall of the flanged joint body (1) is provided with a positioning groove (101) and an extrusion flange (102). The end of the flanged joint body (1) is provided with a sealing gasket (2). The outer wall of the flanged joint body (1) is slidably installed with a first flange (3) and a second flange (4). The outer walls of the first flange (3) and the second flange (4) are provided with bolt holes (5), and the bolt holes (5) are threaded with fixing bolts (7). The outer wall of the first flange (3) is provided with a protective sleeve (302). A guide structure is provided between the first flange (3) and the second flange (4).

2. A pipe flange flange joint according to claim 1, characterized in that: The flanged connector body (1) is symmetrically arranged with two sets of the positioning groove (101) having a trapezoidal cross-section and an overall annular design. The extrusion flanges (102) are arranged at equal intervals, and the diameter of the extrusion flanges (102) gradually increases radially along the flanged connector body (1), and the outer wall of the extrusion flanges (102) is in contact with the outer wall of the sealing gasket (2).

3. A pipe flange flange joint according to claim 1, characterized in that: The sealing gasket (2) is located between the two sets of flanged joint bodies (1) and covers the end of the flanged joint body (1). The outer wall of the sealing gasket (2) is provided with a positioning protrusion (201), and the positioning protrusion (201) is designed in a ring shape. The cross-section of the positioning protrusion (201) is trapezoidal. The outer wall of the positioning protrusion (201) is in contact with the inner wall of the positioning groove (101).

4. A pipe flange flange joint according to claim 1, characterized in that: The protective sleeve (302) and the first flange (3) have a U-shaped cross section, and the inner diameter of the protective sleeve (302) is larger than the outer diameter of the second flange (4). A sealing ring (6) is provided between the protective sleeve (302) and the second flange (4), and the protective sleeve (302) wraps the second flange (4).

5. A pipe flange flange joint according to claim 1, characterized in that: The bolt holes (5) are opened at equal angles, and the first flange (3) and the second flange (4) are connected by fixing bolts (7).

6. A pipe flange flange joint according to claim 1, characterized in that: The guide structure includes a guide block (301) disposed on the outer wall of the first flange (3), a guide groove (401) provided on the outer wall of the second flange (4), and a through hole for the fixing bolt (7) to pass through the center of the guide block (301).

7. A pipe flange flange joint according to claim 6, characterized in that: The guide block (301) is designed in a circular shape, and the guide block (301) is set at an equal angle between the first flange (3) and the second flange (4). The length of the guide block (301) is greater than the distance between the first flange (3) and the second flange (4). The corner of the guide block (301) away from the first flange (3) is designed at an angle. The diameter of the guide groove (401) is greater than the diameter of the bolt hole (5). The inner wall of the guide groove (401) fits against the outer wall of the end of the guide block (301).

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