Sealing structure of neck socket welding flange

Abstract

The utility model provides a sealing structure of a neck socket welding flange, which comprises a flange body and a sealing ring, the flange body is provided with a stepped hole along the axial direction, the inner circumferential surface in the stepped hole, which is vertical to the axis, is provided with a sealing groove, and one side surface of the sealing ring is provided with an embedded bulge matched with the sealing groove. The stepped hole is formed in the flange body, the sealing groove is formed in the inner circumferential surface of the stepped hole, and the sealing ring is provided with the embedded protrusion matched with the sealing groove, so that an accurate and tight matching mechanism is formed, and the design effectively prevents a medium from invading a gap between a pipe and a flange ring step; the possibility of intergranular corrosion and pitting corrosion is reduced fundamentally, the stability and reliability of connection between the flange and the pipe are greatly enhanced, and the shutdown maintenance cost and potential economic losses and safety risks caused by the pipeline connection problem are reduced.

Description

Technical Field

[0001] This utility model relates to the field of flange technology, and in particular to a sealing structure for a necked socket welding flange. Background Technology

[0002] The main function of flanges is to connect pipes or equipment, ensuring the sealing and stability of the system. With functions of connection, sealing, support, and vibration isolation, flanges play an irreplaceable role in modern industry as an important mechanical connector.

[0003] Socket welding flanges are flanges where the end of a pipe is inserted into a stepped socket, and welding is performed on the pipe end and the outside. This design gives socket welding flanges good rigidity, minimal welding deformation, and high sealing performance, making them suitable for pressure ranges from 1.0 to 10.0 MPa. Due to their excellent performance characteristics and wide range of applications, socket welding flanges play an indispensable role in modern industry, primarily in petrochemicals, shipbuilding, metallurgy, pharmaceuticals, food processing, power generation, and machinery manufacturing.

[0004] In applications of necked socket welding flanges, according to standards, the pipe must be inserted into the flange to a certain depth. During long-term use, the medium can easily enter the flange, and intergranular corrosion and pitting can easily occur in the gaps, leading to unstable connection between the flange and the pipe. Eventually, the pipe may detach from the flange, causing safety hazards. This connection failure can trigger a series of safety risks. In industrial fields with extremely high safety requirements, such as chemical and petroleum industries, it could potentially lead to serious accidents, posing a huge threat to personnel safety, normal equipment operation, and production continuity. Therefore, there is an urgent need for a sealing structure for necked socket welding flanges that can effectively solve this problem. Utility Model Content

[0005] The purpose of this invention is to provide a sealing structure for a necked socket welding flange, which limits the insertion depth of the pipe while solving the problem of unstable flange-pipe connection caused by intergranular corrosion and pitting corrosion.

[0006] This utility model provides a sealing structure for a necked socket welding flange, including a flange body and a sealing ring. The flange body has a stepped hole along the axial direction, and a sealing groove is formed on the inner circumferential surface of the stepped hole perpendicular to the axis. The sealing ring has an interlocking protrusion on one side surface that mates with the sealing groove.

[0007] Furthermore, both the sealing groove and the fitting protrusion are annular structures.

[0008] Furthermore, both the sealing groove and the fitting protrusion are arc-shaped structures. The circumferential surface is provided with multiple arc-shaped sealing grooves at equal intervals along its circumference, and the sealing ring is provided with multiple arc-shaped fitting protrusions at equal intervals that cooperate with the arc-shaped sealing grooves.

[0009] Furthermore, the sealing ring includes an annular gasket and the fitting protrusion, the annular gasket and the fitting protrusion being an integrally formed structure.

[0010] Furthermore, the cross-sections of the sealing groove and the fitting protrusion are semi-circular.

[0011] Furthermore, the inner diameter of the annular gasket is not less than the minimum diameter of the stepped hole, and the outer diameter of the annular gasket is the same as the maximum diameter of the stepped hole.

[0012] Furthermore, several annular protrusions are provided on both sides of the annular gasket along the radial direction.

[0013] Furthermore, the cross-sectional shape of the annular protrusion is rectangular, trapezoidal, or triangular.

[0014] Furthermore, the sealing ring is made of a non-metallic material.

[0015] Furthermore, the sealing ring is made of rubber, flexible graphite, or polytetrafluoroethylene.

[0016] The beneficial effects of this technical solution are as follows: by setting a sealing groove on the inner circumferential surface of the stepped hole in the flange body and making the sealing ring have a matching fitting protrusion, a precise and tight fit mechanism is formed. This design effectively prevents the medium from entering the gap between the pipe and the flange ring step, fundamentally reducing the possibility of intergranular corrosion and pitting corrosion, greatly enhancing the stability and reliability of the flange and pipe connection, reducing downtime maintenance costs and potential economic losses and safety risks caused by pipeline connection problems, and the use of the sealing ring can effectively control the insertion depth of the pipe. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a half-sectional structural diagram of Embodiment 1 of the present invention.

[0019] Figure 2 This is a half-sectional structural diagram of Embodiment 3 of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1-flange body, 101-stepped hole, 102-sealing groove, 2-sealing ring, 201-annular gasket, 202-fitting protrusion, 203-annular ridge. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "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; 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 based on the specific circumstances.

[0024] Example 1

[0025] like Figure 1As shown, this utility model provides a sealing structure for a necked socket welding flange, including a flange body 1 and a sealing ring 2. By selecting a sealing ring 2 of appropriate thickness, the insertion depth of the pipe into the flange body 1 can be effectively controlled. The flange body 1 has a stepped hole 101 along the axial direction, and a sealing groove 102 is formed on the inner circumferential surface of the stepped hole 101 perpendicular to the axis. The sealing ring 2 includes an integrally formed annular gasket 201 and an interlocking protrusion 202. The shape and size of the interlocking protrusion 202 match the sealing groove 102. In this embodiment, both the sealing groove 102 and the interlocking protrusion 202 are designed as annular structures, and the cross-sections of both the sealing groove 102 and the interlocking protrusion 202 are designed as semi-circular. The sealing ring can limit the insertion depth of the pipe, ensuring a certain depth as required by standards. At the same time, the sealing ring 2 contacts the flange body 1 and the pipe to prevent the entry of the medium.

[0026] The inner diameter of the annular gasket 201 is not less than the minimum diameter of the stepped hole 101, and the outer diameter of the annular gasket 201 is the same as the maximum diameter of the stepped hole 101; the most preferred inner diameter of the annular gasket 201 is set to be the same as the minimum diameter of the stepped hole 101.

[0027] In this embodiment, the sealing ring 2 is made of non-metallic materials, specifically elastic materials such as rubber, flexible graphite, or polytetrafluoroethylene.

[0028] Example 2

[0029] Compared with Embodiment 1, the technical features that distinguish this embodiment are: both the sealing groove 102 and the fitting protrusion 202 are arc-shaped structures, and multiple arc-shaped sealing grooves 102 are equally spaced along the circumferential direction on the circumferential surface, and multiple arc-shaped fitting protrusions 202 that cooperate with the arc-shaped sealing grooves 102 are equally spaced on the sealing ring 2.

[0030] Example 3

[0031] like Figure 2 As shown, the difference between this embodiment and Embodiments 1 and 2 is that: both sides of the annular gasket 201 are provided with a plurality of annular protrusions 203 along the radial direction, and the cross-sectional shape of the annular protrusions 203 is rectangular, trapezoidal, or triangular. The annular protrusions 203 can block substances that leak radially along the annular gasket 201. When the pipe is inserted into the flange, the annular gasket 201 is compressed, and the annular protrusions 203 are compressed, resulting in a higher local density in the area of ​​the annular gasket 201, thus blocking the radial leakage of the medium.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sealing structure for a necked socket welding flange, characterized in that, The flange includes a flange body and a sealing ring. The flange body has a stepped hole along the axial direction. A sealing groove is formed on the inner circumferential surface of the stepped hole perpendicular to the axis. The sealing ring has an interlocking protrusion on one side surface that mates with the sealing groove.

2. The sealing structure of the necked socket welding flange according to claim 1, characterized in that, Both the sealing groove and the fitting protrusion are annular structures.

3. The sealing structure of the necked socket welding flange according to claim 1, characterized in that, Both the sealing groove and the fitting protrusion are arc-shaped structures. Multiple arc-shaped sealing grooves are evenly spaced along the circumference of the circumference surface, and multiple arc-shaped fitting protrusions that cooperate with the arc-shaped sealing grooves are evenly spaced on the sealing ring.

4. The sealing structure of the necked socket welding flange according to claim 2 or 3, characterized in that, The sealing ring includes an annular gasket and the fitting protrusion, which are integrally formed.

5. The sealing structure of the necked socket welding flange according to claim 4, characterized in that, The cross-sections of the sealing groove and the fitting protrusion are semi-circular.

6. The sealing structure of the necked socket welding flange according to claim 4, characterized in that, The inner diameter of the annular gasket is not less than the minimum diameter of the stepped hole, and the outer diameter of the annular gasket is the same as the maximum diameter of the stepped hole.

7. The sealing structure of the necked socket welding flange according to claim 4, characterized in that, The annular gasket has several annular protrusions on both sides along the radial direction.

8. The sealing structure of the necked socket welding flange according to claim 7, characterized in that, The cross-sectional shape of the annular protrusion is rectangular, trapezoidal, or triangular.

9. The sealing structure of the necked socket welding flange according to claim 1, characterized in that, The sealing ring is made of non-metallic material.

10. The sealing structure of the necked socket welding flange according to claim 9, characterized in that, The sealing ring is made of rubber, flexible graphite, or polytetrafluoroethylene.

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