Loop flange assembly with double seal

Abstract

The utility model discloses a kind of double sealing structure's live loop flange assembly, the back of first flange is equipped with the socket slot for receiving pipe end, the end of pipe is inserted into this socket slot and is welded and fixed with first flange;The front of first flange is equipped with annular sealing boss and the sealing groove formed outside the sealing boss, sealing rubber ring is sleeved in sealing groove;Second flange is equipped with assembly groove, and the end of pipe material is formed flanging by turning over, and flanging is abutted to assembly groove;Sealing rubber ring is sleeved in sealing groove;When first flange and second flange are locked by bolt, the end surface of the sealing boss of first flange and the end surface of flanging are pressed and fit to form the first seal, simultaneously, sealing rubber ring is compressed between sealing groove and flanging end surface to form the second seal. By setting the first seal and the second seal, double sealing guarantee is formed, and the sealing reliability is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of pipe connector technology, specifically to a loose flange assembly with a double sealing structure. Background Technology

[0002] In industrial piping systems, flange connections are a widely used detachable connection method. Traditional flange connections typically rely on gaskets being compressed between the flange faces to form a single seal. This structure has several drawbacks: firstly, the gaskets are directly exposed to the pipeline medium, making them susceptible to corrosion, erosion, and aging failure; secondly, the reliability of a single seal is limited, and leakage will occur once the gasket fails. Therefore, there is an urgent need for a flange connection structure with more reliable sealing and a longer service life. Utility Model Content

[0003] To address the aforementioned problems, this utility model aims to provide a loose flange assembly with a double sealing structure.

[0004] To achieve this technical objective, the present invention provides a loose flange assembly with a double sealing structure, comprising a first flange mounted on a pipe fitting, a second flange that can be fitted onto the pipe, and a sealing ring. The back of the first flange is provided with a socket for receiving the end of the pipe fitting, and the end of the pipe fitting is inserted into the socket and welded and fixed to the first flange. The front of the first flange is provided with an annular sealing boss and a sealing groove formed inside the sealing boss.

[0005] The second flange is provided with an assembly groove, and the end of the pipe is turned outward to form a flange, which abuts against the assembly groove; the sealing ring is fitted inside the sealing groove; when the first flange and the second flange are locked together by bolts, the sealing boss end face of the first flange and the end face of the flange are pressed together to form a first seal, and at the same time, the sealing ring is compressed between the sealing groove and the end face of the flange to form a second seal.

[0006] Preferably, the inner wall of the first flange extends with a sealing edge, and the sealing ring is fitted into the sealing groove between the sealing edge and the sealing boss.

[0007] Preferably, the end of the sealing edge is provided with a chamfer structure to match the curvature of the pipe flange corner. When the first flange and the second flange are locked, the chamfer of the sealing edge matches and matches the pipe flange corner.

[0008] Preferably, the radial width of the socket is matched with the wall thickness of the pipe fitting.

[0009] Preferably, the width of the sealing groove is smaller than the cross-sectional width of the sealing ring in its free state.

[0010] Preferably, the contour of the mounting groove matches the contour of the flange.

[0011] Preferably, the sealing edge, sealing boss, and sealing groove are integrally formed by the first flange.

[0012] Preferably, the fitting is a tee, elbow, or straight.

[0013] The beneficial effects of this utility model are as follows: by setting a first seal and a second seal, a double sealing guarantee is formed, which greatly improves the sealing reliability; the sealing groove can accurately position the sealing ring, which is convenient for direct on-site installation, avoids displacement during installation, and ensures the sealing effect; the socket structure facilitates the installation and positioning of pipe fittings, the internal joint is welded, and there are no welding marks on the outside, which is beautiful and durable; the overall structure is reasonable, easy to install, and suitable for various pipe connection occasions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the first flange in this utility model;

[0016] Figure 3 This is a structural schematic diagram of the front of the first flange in this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the second flange in this utility model.

[0018] In the diagram: 1. First flange; 11. Socket; 12. Sealing boss; 13. Sealing groove; 14. Sealing edge; 2. Second flange; 21. Assembly groove; 3. Sealing ring; 4. Pipe fitting; 5. Pipe; 51. Flanged edge; 52. Corner position. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. To provide a clear and complete description of the technical solution, the following embodiments are selected for illustration; these embodiments are only some embodiments of the present invention; other embodiments obtained based on this application without creative effort are all within the scope of protection of the present invention.

[0020] In the following embodiments, it should be noted that the terms "upper," "lower," "left," "right," "inner," "outer," "top / bottom," etc., are all based on the orientation or positional relationship shown in the accompanying drawings and are only for the purpose of clearly describing this embodiment. They do not indicate or imply that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this application. At the same time, the terms "first" and "second" in the embodiments are only used for descriptive purposes and do not represent an indication or implication of relative importance.

[0021] like Figure 1-2 As shown, a specific embodiment of this utility model is a loose flange assembly with a double sealing structure, including a first flange 1, a second flange 2, and a sealing ring 3. This assembly is used to connect a pipe fitting 4 and a pipe 5.

[0022] The first flange 1 is the core component of this invention. On the back of the first flange 1 (i.e., the side opposite to the second flange 2), an annular socket 11 is machined. The radial width of the socket 11 matches the wall thickness of the pipe fitting 4. The socket 11 provides a positioning reference for the end of the pipe fitting 4, simplifying the assembly process. Furthermore, the socket 11 increases the welding contact area between the first flange 1 and the pipe fitting 4. Preferably, welding is performed at the joint of the socket 11, and all welding operations are completed inside the socket 11. After welding, the weld is completely hidden and protected, and the outer surface of the first flange 1 is smooth and without any traces of welding.

[0023] like Figure 3 As shown, a protruding annular sealing boss 12 is provided on the front side of the first flange 1 (i.e., the side that abuts with the second flange 2) through an integral molding process. An annular sealing groove 13 is naturally formed on the inner side of this sealing boss 12. In this embodiment, the groove width of the sealing groove 13 is designed to be 9mm, and the cross-sectional diameter of the sealing ring 3 in its free state is 12mm.

[0024] like Figure 4 As shown, the second flange 2 adopts a slip-on design, allowing for highly flexible assembly with the pipe 5. At the end of the pipe 5, a conventional flanging process is used to fold it outwards, forming an annular flanged flange 51. A corresponding mounting groove 21 is provided on the second flange 2. The contour of this mounting groove 21 matches the contour and height of the flanged flange 51, allowing the flange 51 to easily embed and abut within it. This structure allows the second flange 2 to be pre-fitted onto the pipe 5, with flanging and assembly performed on-site. This is particularly suitable for large pipelines or construction scenarios requiring on-site cutting to a fixed length, making transportation and installation very convenient.

[0025] The end of the sealing edge 14 is chamfered to match the curvature of the pipe flange fold position 52. When the first and second flanges are locked, the chamfer of the sealing edge matches the pipe flange fold position. In the initial stage of bolt tightening, the fold position 52 can form a guide surface with the chamfer structure of the sealing edge 14, guiding the two flanges to be accurately aligned. When the flanges are fully locked, the fold position 52 and the end of the sealing edge 14 are positioned opposite each other, together forming a more optimized sealing ring compression space.

[0026] This invention features a dual sealing structure: First seal (hard metal seal): When the first flange 1 and the second flange 2 are tightened with bolts, the end face of the sealing boss 12 of the first flange 1 first forms a tight metal-to-metal contact with the end face of the flange 51 of the second flange 2. This seal constitutes the first barrier, capable of withstanding most of the system pressure and serving as the primary sealing surface. Second seal (soft rubber ring seal): As the bolts are further tightened, the axial distance between the first flange 1 and the second flange 2 continues to decrease. At this time, the end face of the flange 51 axially compresses the sealing rubber ring 3 located within the sealing groove 13. The sealing rubber ring 3 undergoes the expected elastic deformation within the confined space, tightly filling the closed space formed by the groove wall of the sealing groove 13, the sealing edge 14, and the end face of the flange 51, thereby forming a highly reliable second seal.

[0027] This invention achieves a robust and aesthetically pleasing pipe connection through a socket welding structure; it also provides great flexibility in pipe connection through a slip-on flange structure; and finally, a dual sealing mechanism combining a metal hard seal and a rubber ring soft seal ensures long-term sealing reliability of the entire flange connection under various harsh working conditions. This invention is particularly suitable for tees, elbows, straight sections, and other pipe connections where safety and lifespan requirements are high.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any minor modifications, equivalent substitutions and improvements made to the above embodiments based on the technical essence of the present utility model should be included within the protection scope of the technical solution of the present utility model.

Claims

1. A slip-on flange assembly with a double sealing structure, comprising a first flange disposed on a pipe fitting, a second flange that can be fitted onto the pipe, and a sealing ring, characterized in that: The back of the first flange is provided with a socket for receiving the end of the pipe fitting, the end of the pipe fitting is inserted into the socket and welded and fixed to the first flange; the front of the first flange is provided with an annular sealing boss and a sealing groove formed inside the sealing boss. The second flange is provided with an assembly groove, and the end of the pipe is turned outward to form a flange, which abuts against the assembly groove; the sealing ring is fitted inside the sealing groove; when the first flange and the second flange are locked together by bolts, the sealing boss end face of the first flange and the end face of the flange are pressed together to form a first seal, and at the same time, the sealing ring is compressed between the sealing groove and the end face of the flange to form a second seal.

2. The loose flange assembly with a double sealing structure according to claim 1, characterized in that: The inner wall of the first flange extends with a sealing edge, and the sealing ring is fitted into the sealing groove between the sealing edge and the sealing boss.

3. The loose flange assembly with a double sealing structure according to claim 2, characterized in that: The end of the sealing edge is provided with a chamfer structure to match the curvature of the pipe flange. When the first flange and the second flange are locked, the chamfer of the sealing edge matches the flange of the pipe.

4. The loose flange assembly with a double sealing structure according to claim 1, characterized in that: The radial width of the socket is matched with the wall thickness of the pipe fitting.

5. The loose flange assembly with a double sealing structure according to claim 1, characterized in that: The width of the sealing groove is smaller than the cross-sectional width of the sealing ring in its free state.

6. The loose flange assembly with a double sealing structure according to claim 1, characterized in that: The contour of the mounting groove is adapted to the contour of the flange.

7. The loose flange assembly with a double sealing structure according to claim 2, characterized in that: The sealing edge, sealing boss, and sealing groove are integrally formed by the first flange.

8. The loose flange assembly with a double sealing structure according to any one of claims 1-7, characterized in that: The pipe fittings are tees, elbows, or straight pipes.

Images