A type of anti-slip stainless steel flange

Abstract

This utility model discloses an anti-slip stainless steel flange, relating to the field of flange technology. It features good anti-slip performance, high mechanical strength, and long service life. It includes a first flange and a second flange, which are respectively fixedly connected to two pipe sections. The sealing surface of the first flange is a convex surface, and the sealing surface of the second flange is a concave surface. The protrusion height of the convex surface is lower than the concave surface's recess height, and the outer edges of the first and second flanges fit together during assembly. The sealing surfaces of the first and second flanges are provided with annular serrated patterns. Corresponding asymmetrical bolt holes are provided on the first and second flanges. The bolt holes on the first flange have an internally conical opening, and the first and second flanges are connected using conical bolts.

Description

Technical Field

[0001] This utility model relates to the field of flange technology, specifically to an anti-slip stainless steel flange. Background Technology

[0002] Stainless steel flanges are commonly used connection components in piping systems, primarily for sealing and securing pipes, valves, and equipment. Stainless steel flanges are suitable for harsh environments such as acid and alkali exposure, salt spray, high temperature, and high pressure (e.g., chemical and marine engineering). Common materials include 304 (general purpose), 316 (containing molybdenum, resistant to chloride ion corrosion), and 316L (low carbon, resistant to intergranular corrosion). However, traditional flanges have poor internal sealing, leading to leakage of internal fluids when used for pipe connections, affecting equipment operation. Furthermore, the connection structure between flanges can loosen during use, potentially causing flange detachment and creating unnecessary industrial safety hazards.

[0003] For example, Chinese patent CN218348121U discloses an anti-slip stainless steel flange, including a flange body and a pipe. The pipe is fixed to both sides of the flange body by bolts. The flange body uses an adjustment structure to pre-limit the position of the pipe. The adjustment structure includes four sets of receiving grooves on the outer walls of both sides of the flange body, a rotating shaft on the inner wall of the receiving groove, a sliding groove on both sides of the inner wall of the rotating part, a sliding rod on the inner side of the slider, and a mounting seat rotatably mounted on the inner side of the two sets of sliding rods. By setting the adjustment structure, clamps, and rotating structure, the flange is effectively prevented from rotating with the bolts, causing misalignment and preventing other through holes on the flange from being on the same horizontal plane as other through holes on the pipe, thus preventing the remaining bolts from passing through properly and making the flange impossible to install. This improves the practicality of the device. However, in this patent, in order to ensure that the flange does not rotate with the bolts and thus misalign, a relatively complex structure is designed, which is not easy to operate. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the existing technology and provide a non-slip stainless steel flange with good anti-slip performance, high mechanical strength and long service life.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: an anti-slip stainless steel flange, including a first flange and a second flange, the first flange and the second flange being fixedly connected to two pipe sections respectively, the sealing surface of the first flange being a convex surface, the sealing surface of the second flange being a concave surface, the protrusion height of the convex surface being lower than the concavity height of the concave surface, and the outer edges of the first flange and the second flange fitting together during assembly, the sealing surfaces of the first flange and the second flange being provided with annular serrated patterns, and the first flange and the second flange being provided with corresponding asymmetrical bolt holes.

[0006] Furthermore, the bolt holes on the first flange have an inner conical shape, and the first flange and the second flange are connected by conical bolts.

[0007] Furthermore, a gasket is provided between the sealing surfaces of the first flange and the second flange.

[0008] Furthermore, the bolt hole is provided with an eccentric hole.

[0009] Furthermore, the bolt holes on the first flange have an inner conical opening with an angle of 5°-10°.

[0010] Furthermore, triangular reinforcing ribs are welded to the necks of both the first and second flanges.

[0011] Furthermore, a butterfly spring ring and a hydraulic self-locking nut are fitted onto the end of the conical bolt.

[0012] Furthermore, the sealing surfaces of the first flange and the second flange are sandblasted with 60-80 mesh diamond abrasive, with a roughness Ra3.2-6.3μm.

[0013] Furthermore, the surfaces of the first flange and the second flange are subjected to nitriding treatment.

[0014] By adopting the above technical solution, this utility model has the following beneficial effects:

[0015] 1. The sealing surfaces of the first and second flanges are raised face seals, forming a mechanical interlocking structure to prevent radial slippage;

[0016] 2. The sealing surfaces of the first and second flanges are provided with annular serrated patterns, which can increase the friction with the gasket and prevent the gasket from shifting.

[0017] 3. The bolt holes are asymmetrically distributed and must be aligned at a specific angle during installation to prevent circumferential sliding of the flange; the bolt holes on the first flange have an inner conical opening that mates with the conical bolts, generating radial pressure during tightening to enhance shear resistance;

[0018] 4. Welding triangular reinforcing ribs to the necks of the first and second flanges can improve the flanges' resistance to bending deformation.

[0019] 5. The sealing surfaces of the first and second flanges are sandblasted with 60-80 mesh diamond abrasive, with a roughness Ra3.2-6.3μm, which can increase the coefficient of friction and improve anti-slip performance;

[0020] 6. The surfaces of the first and second flanges are nitrided to a depth of 20-50μm, which can increase the hardness to HV800-1000 and enhance the wear resistance of the flanges. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the anti-slip stainless steel flange of this utility model;

[0022] Figure 2 This is a top view of the first flange of this utility model.

[0023] Reference numerals: 1. First flange; 2. Second flange; 3. Gasket; 4. Tapered bolt; 5. Bolt hole;

[0024] 6. Reinforcing rib; 11. Convex surface; 21. Concave surface; 41. Hydraulic self-locking nut. Detailed Implementation

[0025] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0026] like Figure 1-2 As shown, in this embodiment, a non-slip stainless steel flange is provided, including a first flange 1 and a second flange 2. The first flange 1 and the second flange 2 are respectively fixedly connected to two pipe sections. The sealing surface of the first flange 1 is a convex surface 11, and the sealing surface of the second flange 2 is a concave surface 21. The sealing surfaces of the first flange 1 and the second flange 2 are provided with annular serrated patterns. Corresponding asymmetrical bolt holes 5 are opened on the first flange 1 and the second flange 2. The opening of the bolt hole 5 on the first flange 1 is internally conical. The first flange 1 and the second flange 2 are connected by conical bolts 4.

[0027] In this embodiment, the sealing surfaces of the first flange 1 and the second flange 2 are convex and concave surfaces 11, forming a mechanical interlocking structure to prevent radial slippage.

[0028] In this embodiment, a gasket 3 is provided between the sealing surfaces of the first flange 1 and the second flange 2. The gasket 3 is a flexible graphite gasket 3 or a metal spiral wound gasket, which achieves sealing through compression deformation. At the same time, the annular serrated pattern on the sealing surfaces of the first flange 1 and the second flange 2 has a depth of 0.5-1mm and a spacing of 2-3mm, which can increase the friction with the gasket 3 and prevent the gasket 3 from shifting.

[0029] In this embodiment, the protrusion height h1 of the convex surface 11 of the first flange 1 is lower than the concave height h2 of the concave surface 21 of the second flange 2. At the same time, the thickness of the gasket 3 is greater than the height difference between the protrusion height of the convex surface 11 and the concave height of the concave surface 21. When the first flange 1 and the second flange 2 are assembled, the gasket 3 is squeezed. Meanwhile, the outer edges of the first flange 1 and the second flange 2 are in contact. While ensuring the sealing performance, it can avoid excessive compression that could damage the fatigue value of the gasket 3 and thus affect the performance of the gasket 3.

[0030] In this embodiment, the bolt holes 5 are asymmetrically distributed. In this embodiment, eccentric holes are provided. In other embodiments not shown, they can also be set as elliptical holes. During installation, they need to be aligned at a specific angle to prevent the flange from sliding circumferentially.

[0031] In this embodiment, the bolt hole 5 on the first flange 1 has an inner conical opening with an angle of 5°-10°, which cooperates with the conical bolt 4 to generate radial pressure when tightened, thereby enhancing the shear resistance.

[0032] In this embodiment, the neck thickness of the first flange 1 and the second flange 2 is increased by 20%-30%, which can reduce stress concentration. At the same time, triangular reinforcing ribs 6 with a thickness of 8-12mm and a height of 15-20mm are welded to the neck of the first flange 1 and the second flange 2, which can improve the flange's resistance to bending deformation.

[0033] In this embodiment, a butterfly spring ring (not shown) and a hydraulic self-locking nut 41 are fitted at the end of the tapered bolt 4, which can increase the preload by 30% and ensure that a constant clamping force can still be maintained under vibration.

[0034] In this embodiment, the sealing surfaces of the first flange 1 and the second flange 2 are sandblasted with 60-80 mesh diamond abrasive, with a roughness Ra of 3.2-6.3μm, which can increase the coefficient of friction and improve the anti-slip performance. At the same time, the surfaces of the first flange 1 and the second flange 2 are nitrided to a depth of 20-50μm, which can increase the hardness to HV800-1000 and enhance the wear resistance of the flanges.

[0035] The connection method and advantages of this utility model are as follows: The first flange 1 and the second flange 2 are fixedly connected to the two pipe sections by welding. The gasket 3 is placed between the first flange 1 and the second flange 2. The first flange 1 and the second flange 2 are rotated so that the bolt holes 5 on the first flange 1 and the second flange 2 are aligned. The tapered bolt 4 is passed through the bolt holes 5 on the first flange 1 and the second flange 2 from one side of the first flange 1 in sequence. A butterfly spring ring and a hydraulic self-locking nut 41 are fitted at the end of the bolt and the nut is tightened to complete the fixed connection of the two pipe sections. At this time, the outer edges of the first flange 1 and the second flange 2 are in contact. While ensuring the sealing performance, it can avoid excessive compression that could damage the fatigue value of the gasket 3 and affect its performance. After the connection is completed, the sealing surfaces of the first flange 1 and the second flange 2 are concave and convex surfaces 11, forming a mechanical interlocking structure to prevent radial... Sliding; the sealing surfaces of the first flange 1 and the second flange 2 are provided with annular serrated patterns, which can increase the friction with the gasket 3 and prevent the gasket 3 from shifting; the bolt holes 5 are asymmetrically distributed, and must be aligned at a specific angle during installation to prevent circumferential sliding of the flange; the openings of the bolt holes 5 on the first flange 1 are internally conical, which cooperates with the conical bolts 4 to generate radial pressure during tightening, enhancing the shear resistance; triangular reinforcing ribs 6 are welded to the necks of the first flange 1 and the second flange 2 to improve the flange's resistance to bending deformation; the sealing surfaces of the first flange 1 and the second flange 2 are sandblasted with 60-80 mesh diamond abrasive, with a roughness Ra 3.2-6.3μm, which can increase the friction coefficient and improve the anti-slip performance; at the same time, the surfaces of the first flange 1 and the second flange 2 are nitrided to a depth of 20-50μm, which can increase the hardness to HV800-1000 and enhance the wear resistance of the flange.

[0036] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A non-slip stainless steel flange, characterized in that: Includes a first flange (1) and a second flange (2), the first flange (1) and the second flange (2) are fixedly connected to two sections of pipe respectively. The sealing surface of the first flange (1) is a convex surface (11), and the sealing surface of the second flange (2) is a concave surface (21). The protrusion height of the convex surface (11) is lower than the concave height of the concave surface (21). When assembled, the outer edges of the first flange (1) and the second flange (2) are in contact. The sealing surfaces of the first flange (1) and the second flange (2) are provided with annular serrated patterns. Corresponding asymmetrical bolt holes (5) are opened on the first flange (1) and the second flange (2).

2. The anti-slip stainless steel flange according to claim 1, characterized in that: A gasket (3) is provided between the sealing surfaces of the first flange (1) and the second flange (2).

3. The anti-slip stainless steel flange according to claim 1, characterized in that: The bolt hole (5) is provided with an eccentric hole.

4. The anti-slip stainless steel flange according to claim 1, characterized in that: The bolt holes (5) on the first flange (1) have an inner conical opening with an angle of 5°-10°.

5. The anti-slip stainless steel flange according to claim 1, characterized in that: The necks of the first flange (1) and the second flange (2) are welded with triangular reinforcing ribs (6).

6. The anti-slip stainless steel flange according to claim 1, characterized in that: The bolt holes (5) on the first flange (1) are tapered. The first flange (1) and the second flange (2) are connected by tapered bolts (4). The ends of the tapered bolts (4) are fitted with butterfly spring rings and hydraulic self-locking nuts (41).

7. The anti-slip stainless steel flange according to claim 1, characterized in that: The sealing surfaces of the first flange (1) and the second flange (2) are sandblasted with 60-80 mesh diamond abrasive, with a roughness of Ra3.2-6.3μm.

8. The anti-slip stainless steel flange according to claim 1, characterized in that: The surfaces of the first flange (1) and the second flange (2) are nitrided.

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