A loop flange assembly with double sealing structure

Abstract

The utility model discloses a kind of double sealing structure's loop turn-up flange assembly, first flange is installed on pipe fitting, and the port of pipe fitting protrudes from the front of first flange;The front of first flange is provided with integrally-formed annular boss, annular boss and the outer wall between pipe fitting form a annular groove;The end of tubular product is turned up to form turn-up, second flange is provided with assembly groove, and turn-up is contained in assembly groove so that tubular product is sleeved on second flange;The edge of second flange protrudes from the edge wall of turn-up;Sealing rubber ring is arranged in annular groove.By pipe fitting port and the metal-to-metal contact of tubular product turn-up end surface form first hard seal, then by the compression of sealing rubber ring form second soft seal, two seals greatly improve the sealing reliability significantly prolong the service life of sealing ring;Field installation efficiency is higher.

Description

Technical Field

[0001] This utility model relates to the field of pipe connector technology, specifically to a loose flange assembly. 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 issues, this utility model aims to provide a loose flange assembly with a double sealing structure, which offers stronger sealing performance and higher assembly efficiency.

[0004] To achieve this technical objective, the present invention provides a loose-fitting flange assembly with a double-sealing structure, comprising a first flange that can be fitted onto a pipe fitting, a second flange that can be fitted onto a pipe, and a sealing ring. The first flange is installed on the pipe fitting, and the end of the pipe fitting protrudes from the front of the first flange. The front of the first flange is provided with an integrally formed annular boss, and an annular groove is formed between the annular boss and the outer wall of the pipe fitting. The end of the pipe is turned outward to form a flange. The second flange is provided with an assembly groove, and the flange is accommodated in the assembly groove so that the pipe fitting is fitted onto the second flange. The edge of the second flange protrudes from the side wall of the flange. The sealing ring is disposed in the annular groove. When the first flange and the second flange are locked together by bolts, the end face of the pipe fitting and the flanged end face of the pipe are pressed together to form a first seal, and the sealing ring is compressed between the annular groove and the flanged end face to form a second seal.

[0005] Preferably, the contour of the mounting groove matches the contour of the flange.

[0006] Preferably, the radial width of the annular groove is configured to restrict the radial movement of the sealing ring and to cause it to compress and deform when the flange is tightened.

[0007] Preferably, the radial width of the annular groove is 8 mm, and the cross-sectional width of the sealing ring is 10 mm.

[0008] Preferably, the fitting is a tee, elbow, or straight.

[0009] The beneficial effects of this utility model are as follows: the first hard seal is formed by the metal-to-metal contact between the pipe fitting port and the flanged end face of the pipe, and the second soft seal is formed by the compression of the sealing ring. The two seals greatly improve the sealing reliability. The first metal seal is located on the inside, which can effectively prevent the medium in the pipeline from directly scouring and corroding the sealing ring, and at the same time avoid the direct contact between the sealing ring and high temperature or special media, which significantly extends the service life of the sealing ring. The second flange is a loose type, which is convenient for alignment during installation, does not require on-site welding, and has higher on-site assembly efficiency. Attached Figure Description

[0010] Figure 1 This is one of the exploded views of this utility model;

[0011] Figure 2 This is the second exploded view of this utility model;

[0012] Figure 3 This is a schematic diagram of the structure of the first flange and pipe fitting in this utility model;

[0013] Figure 4 This is a schematic diagram of the structure of the second flange and the pipe in this utility model;

[0014] Figure 5 This is a partial cross-sectional view of the two pipe fittings combined in this utility model;

[0015] Figure 6 This is a cross-sectional view of the present invention.

[0016] In the diagram: 1. First flange; 11. Annular boss; 12. Annular groove; 2. Second flange; 21. Assembly groove; 3. Sealing ring; 4. Pipe fitting; 5. Pipe; 51. Flanged edge. Detailed Implementation

[0017] 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.

[0018] 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.

[0019] like Figure 1-6 As shown, the specific embodiment of this utility model is a loose flange assembly with a double sealing structure, mainly composed of a first flange 1, a second flange 2 and a sealing ring 3.

[0020] The first flange 1 is fitted onto the end of the pipe fitting 4 (shown as a tee pipe) through its through hole, and the outer wall of the end of the pipe fitting 4 is fixed to the through hole port of the first flange 1 by welding. During welding, the end face of the pipe fitting 4 is controlled to protrude from the front plane of the first flange 1. On the front of the first flange 1, an integrally formed annular boss 11 is provided, and an annular groove 12 is formed between the boss 11 and the outer wall of the pipe fitting 4. In this embodiment, the radial width of the annular groove 12 is designed to be 8 mm.

[0021] The end of the pipe 5 is turned outward to form a flange 51. The back of the second flange 2 (loose flange) is machined with a mounting groove 21, the contour of which matches the contour of the flange 51. The flange 51 is inserted into the mounting groove 21 so that the two fit together. The edge of the second flange 2 protrudes from the outer wall of the flange 51.

[0022] During installation, first place a sealing ring 3 (such as an O-ring) with a cross-sectional diameter of 10mm into the annular groove 12 of the first flange 1. Since the radial width (8mm) of the annular groove 12 is smaller than the diameter (10mm) of the sealing ring 3, the sealing ring 3 is initially restricted and positioned. Then, mate the first flange assembly with the second flange assembly, align the end of the fitting 4 with the flange 51 end face of the pipe 5, insert the bolts, and tighten them.

[0023] After the bolts are tightened, the two flanges come closer together. First, the end face of the protruding pipe fitting 4 is tightly pressed against the end face of the flange 51, forming the first metal seal (hard seal). At the same time, the side wall of the annular groove 12 gradually approaches the end face of the flange 51, compressing the sealing ring 3 located therein from 10mm to about 8mm, causing it to elastically deform and tightly fill the space between the annular groove 12 and the end face of the flange 51, thus forming the second seal (soft seal). The gasket / ring of a traditional flange is directly exposed to the medium and is prone to aging. The ring of this invention is protected by the metal sealing surface, avoiding direct erosion, corrosion and high temperature, thus extending its service life several times. This invention solves the problem of immediate leakage once the single seal of a traditional flange fails by using a double seal, significantly improving reliability.

[0024] This utility model is not only applicable to tee pipes, but fitting 4 can also be other types of fittings such as straight pipes and elbows.

[0025] 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 that can be fitted onto a pipe fitting, a second flange that can be fitted onto a pipe, and a sealing ring, characterized in that: The first flange is installed on the pipe fitting, and the end of the pipe fitting protrudes from the front of the first flange; the front of the first flange is provided with an integrally formed annular boss, and an annular groove is formed between the annular boss and the outer wall of the pipe fitting; the end of the pipe is turned outward to form a flange, and the second flange is provided with an assembly groove, the flange is accommodated in the assembly groove so that the pipe is fitted onto the second flange; the edge of the second flange protrudes from the side wall of the flange; the sealing ring is disposed in the annular groove; when the first flange and the second flange are locked together by bolts, the end face of the pipe fitting and the flange end face of the pipe are pressed together to form a first seal, and the sealing ring is compressed between the annular groove and the flange end face to form a second seal.

2. The loose-fitting 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.

3. The loose-fitting flange assembly with a double sealing structure according to claim 2, characterized in that: The radial width of the annular groove is configured to restrict the radial movement of the sealing ring and to cause it to compress and deform when the flange is tightened.

4. The loose flange assembly with a double sealing structure according to claim 3, characterized in that: The radial width of the annular groove is 8 mm, and the cross-sectional width of the sealing ring is 10 mm.

5. The loose flange assembly with a double sealing structure according to any one of claims 1-4, characterized in that: The pipe fittings are tees, elbows, or straight pipes.

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