Anti-corrosion sealing gasket of socket welding carbon steel flange

Abstract

The utility model relates to a flange sealing gasket, and discloses an anti-corrosion sealing gasket of a socket welding carbon steel flange, which comprises a sealing body 6 and a steel framework 7. The sealing body is made of an anti-corrosion polytetrafluoroethylene organic polymer material and is formed by combining a barrel-shaped body 601 and a flat gasket body 602; the cylindrical body is installed on the inner walls of the two carbon steel flanges 2 and used for sealing the inner wall sides of the two carbon steel flanges 2 so as to achieve the anti-corrosion purpose. The flat gasket body is installed on the sealing end faces of the two carbon steel flanges 2 and used for sealing the end faces of the two carbon steel flanges 2. The steel framework is arranged in the sealing body 6, is used for improving the strength of the sealing body, and is formed by installing and welding a ring body 701, a plurality of transverse ribs 702 and a plurality of vertical ribs 703. The anti-corrosion sealing gasket can guarantee the anti-corrosion effect of the carbon steel flange, and the stainless steel material cost for manufacturing the flange is saved.

Description

Technical field:

[0001] The utility model relates to a flange sealing gasket, in particular to an anti-corrosion sealing gasket, which is used for flange end face sealing and flange inner wall anti-corrosion after welding a stainless steel pipe and a carbon steel socket flange. Background technology:

[0002] The flanges of high-pressure pipelines are thick and consume a lot of metal materials during processing and manufacturing. When the medium transmitted in the pipeline is highly corrosive, it is necessary to use expensive stainless steel materials, which makes the manufacturing cost of stainless steel flanges very high.

[0003] If ordinary carbon steel flanges are used, conventional gaskets in the prior art can only seal the end faces of the two flanges. Figure 1 As shown, the inner wall of the flange is exposed to corrosive media, which is prone to severe corrosion and even perforation and leakage. There is currently no effective technical means to replace stainless steel flanges with low-cost carbon steel flanges for welding to stainless steel pipes while ensuring the anti-corrosion effect of the inner wall of the carbon steel flange. Utility model content:

[0004] In response to the technical problems mentioned in the above background technology, the utility model provides an anti-corrosion sealing gasket for socket-welded carbon steel flange, which is used for flange end face sealing and inner wall corrosion protection after welding of stainless steel pipe and carbon steel socket flange.

[0005] The technical solution of the utility model is: the anti-corrosion sealing gasket includes a sealing body 6, the material of which is an anti-corrosion polytetrafluoroethylene organic polymer material;

[0006] The sealing body is composed of two parts: a cylindrical body 601 and a flat cushion body 602;

[0007] The length of the cylindrical body is greater than the gap between the stainless steel pipe 1 and the carbon steel flange 2 after butt welding, and the outer diameter is interference fit with the inner diameter of the stainless steel pipe 1; the cylindrical body is installed on the inner wall side of the two carbon steel flanges 2, and the two ends of the cylindrical body pass over the two butt gaps and are squeezed on the inner walls of the two stainless steel pipes 1, so as to seal the inner wall sides of the two carbon steel flanges 2 to achieve the purpose of corrosion protection;

[0008] The flat gasket body is connected to the outer side of the middle portion of the cylindrical body and is installed at the sealing end faces of the two carbon steel flanges 2 to seal the end faces of the two carbon steel flanges 2 .

[0009] Further improved technical solution: the anti-corrosion sealing gasket further includes a steel skeleton 7; the steel skeleton is arranged inside the sealing body 6 and is completely wrapped by the sealing body to improve the strength of the sealing body;

[0010] The steel skeleton is welded together by a ring body 701, several transverse ribs 702, and several vertical ribs 703; the ring body is annular and is arranged at the intersection of the cylindrical body and the flat washer body inside the sealing body 6; several transverse ribs are connected to the outer radial direction of the ring body and are arranged in the flat washer body of the sealing body to strengthen the connection strength between the flat washer body and the cylindrical body; several vertical ribs are axially connected to the upper and lower sides of the ring body and are arranged in the cylindrical body of the sealing body to strengthen the supporting strength of the cylindrical body when inserted into the stainless steel pipe 1.

[0011] Further optimization and improvement: In order to ensure that the cylindrical body of the sealing body 6 can be smoothly inserted into the inner side of the stainless steel pipe 1, rounded corners are set at both ends of the cylindrical body; and before the stainless steel pipe 1 is welded to the carbon steel flange 2, an inner chamfer 101 is processed at the end of the stainless steel pipe 1.

[0012] Compared with the existing background technology, at least one of the above technical solutions adopted in one or more embodiments of this specification can achieve the following beneficial effects:

[0013] First, the anti-corrosion sealing gasket can ensure the anti-corrosion effect of the carbon steel flange, saving the cost of stainless steel materials for flange manufacturing; second, the steel skeleton enhances the strength of the anti-corrosion sealing gasket, ensuring that it can be smoothly inserted into the stainless steel pipe 1; finally, the anti-corrosion sealing gasket has a simple structure and the installation process is simple and convenient.

[0014] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention.

[0015] Further features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. Description of the drawings:

[0016] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present invention and, together with the specification, are used to illustrate the technical solutions of the present invention.

[0017] Figure 1 A cross-sectional view of a conventional gasket in the prior art installed at a flange to achieve sealing;

[0018] Figure 2 is a cross-sectional view of the sealing body of the anti-corrosion sealing gasket;

[0019] Figure 3 A three-dimensional diagram of the steel skeleton of the anti-corrosion sealing gasket;

[0020] Figure 4 It is a cross-sectional view of the sealing body and the steel skeleton combined to form the anti-corrosion sealing gasket;

[0021] Figure 5 A cross-sectional view of the stainless steel tube being processed with the inner chamfer;

[0022] Figure 6 A cross-sectional view showing the stainless steel pipe and the carbon steel flange being welded together;

[0023] Figure 7 A cross-sectional view of the anti-corrosion sealing gasket inserted into one of the carbon steel flanges;

[0024] Figure 8 This is a cross-sectional view of the anti-corrosion sealing gasket connected to the two carbon steel flanges.

[0025] In the figure: 1-stainless steel pipe, 101-inner chamfer; 2-carbon steel flange; 3-weld; 4-conventional gasket; 5-bolts and nuts; 6-sealing body, 601-cylindrical body, 602-flat washer body; 7-steel skeleton, 701-ring body, 702-transverse reinforcement, 703-vertical reinforcement. Specific implementation method:

[0026] Various exemplary embodiments, features, and methods of use of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0027] In addition, numerous specific details are provided in the following detailed description to better illustrate the present invention. Those skilled in the art will appreciate that the present invention can be practiced without certain specific details. In some instances, methods, means, and components well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present invention.

[0028] like Figures 2 to 8 As shown, an anti-corrosion sealing gasket for a socket-welded carbon steel flange is used for flange end face sealing and inner wall corrosion protection after welding a stainless steel pipe to a carbon steel socket flange.

[0029] like Figures 2 to 4 As shown, the anti-corrosion sealing gasket includes a sealing body 6 and a steel skeleton 7.

[0030] The sealing body is made of corrosion-resistant polytetrafluoroethylene organic polymer material and is composed of a cylindrical body 601 and a flat washer body 602; wherein, the length of the cylindrical body is greater than the gap distance after the stainless steel pipe 1 and the carbon steel flange 2 are butt-welded, and the outer diameter is interference fit with the inner diameter of the stainless steel pipe 1; the cylindrical body is installed on the inner walls of the two carbon steel flanges 2, and the two ends of the cylindrical body pass over the two butt gaps and are squeezed on the inner wall sides of the two stainless steel pipes 1, and are used to seal the inner wall sides of the two carbon steel flanges 2 to achieve the purpose of corrosion protection; the flat washer body is connected to the outside of the middle part of the cylindrical body and is installed at the sealing end faces of the two carbon steel flanges 2, and is used to seal the end faces of the two carbon steel flanges 2.

[0031] The steel skeleton is arranged inside the sealing body 6 and is completely wrapped by the sealing body to improve the strength of the sealing body. The steel skeleton is made of carbon steel and is welded together by a ring body 701, a plurality of transverse ribs 702, and a plurality of vertical ribs 703. The ring body is in a circular shape and is arranged at the junction of the cylindrical body and the flat washer body inside the sealing body 6. Several of the transverse ribs are connected to the outer radial direction of the ring body and are arranged in the flat washer body of the sealing body to strengthen the connection strength between the flat washer body and the cylindrical body. Several of the vertical ribs are axially connected to the upper and lower sides of the ring body and are arranged in the cylindrical body of the sealing body to strengthen the support strength of the cylindrical body when it is inserted into the stainless steel pipe 1.

[0032] In order to ensure that the cylindrical body of the sealing body 6 can be smoothly inserted into the inner side of the stainless steel pipe 1, rounded corners are set at both ends of the cylindrical body; and before welding the stainless steel pipe 1 and the carbon steel flange 2, an inner chamfer 101 is processed at the end of the stainless steel pipe 1, as shown in FIG. Figure 5 shown.

[0033] like Figures 5 to 8 As shown, the specific method of using the anti-corrosion sealing gasket is as follows:

[0034] Before welding, the ends of the two stainless steel pipes 1 are processed with inner chamfers 101, as shown in FIG. Figure 5 Then insert the end of the stainless steel pipe 1 into the carbon steel flange 2 and weld it on the outside, as shown. Figure 6 shown.

[0035] Insert the anti-corrosion sealing gasket into a carbon steel flange 2, as shown in FIG. Figure 7 As shown; then align another carbon steel flange 2 with the anti-corrosion sealing gasket and insert it, push the two carbon steel flanges 2 tightly together, connect the bolts and nuts 5 to tighten, the anti-corrosion sealing gasket seals the inner wall side and end face of the two carbon steel flanges 2 to achieve sealing and corrosion protection of the carbon steel flange 2, as shown Figure 8 shown.

Claims

1. An anti-corrosion sealing gasket for a socket-welded carbon steel flange, comprising a sealing body (6) made of an anti-corrosion polytetrafluoroethylene organic polymer material, characterized in that: The sealing body is composed of a cylindrical body (601) and a flat cushion body (602); The length of the cylindrical body is greater than the gap distance between the stainless steel pipe (1) and the carbon steel flange (2) after butt welding, and the outer diameter is interference-fitted with the inner diameter of the stainless steel pipe (1); the cylindrical body is installed on the inner wall side of the two carbon steel flanges (2), and the two ends of the cylindrical body pass over the two butt gaps and are squeezed on the inner walls of the two stainless steel pipes (1) to seal the inner wall sides of the two carbon steel flanges (2) to achieve the purpose of corrosion protection; The flat gasket body is connected to the outside of the middle portion of the cylindrical body and is installed at the sealing end faces of the two carbon steel flanges (2) for sealing the end faces of the two carbon steel flanges (2).

2. The anti-corrosion sealing gasket for socket welding carbon steel flange according to claim 1, characterized in that: Also includes a steel skeleton (7); The steel skeleton is arranged inside the sealing body (6) and is completely wrapped by the sealing body, so as to improve the strength of the sealing body; The steel skeleton is welded together by a ring body (701), a plurality of transverse ribs (702), and a plurality of vertical ribs (703); the ring body is annular and is arranged at the intersection of the cylindrical body and the flat washer body inside the sealing body (6); a plurality of the transverse ribs are connected to the outer radial direction of the ring body and are arranged in the flat washer body of the sealing body to strengthen the connection strength between the flat washer body and the cylindrical body; a plurality of the vertical ribs are axially connected to the upper and lower sides of the ring body and are arranged in the cylindrical body of the sealing body to strengthen the support strength of the cylindrical body when it is inserted into the stainless steel pipe (1).

3. The anti-corrosion sealing gasket for socket welding carbon steel flange according to claim 1, characterized in that: In order to ensure that the cylindrical body of the sealing body (6) can be smoothly inserted into the inner side of the stainless steel pipe (1), rounded corners are provided at both ends of the cylindrical body; and before the stainless steel pipe (1) is welded to the carbon steel flange (2), an inner chamfer (101) is processed at the end of the stainless steel pipe (1).

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