Low-temperature-resistant carbon steel flange

Abstract

The utility model discloses a low temperature resistant carbon steel flange which comprises a first flange, a second flange and a bolt, the first flange is provided with a first butt joint face, the second flange is provided with a second butt joint face attached to the first butt joint face, and the first butt joint face is provided with a positioning groove, a first installation hole and an arc-shaped groove. The second butt joint face is provided with a positioning protrusion matched with the positioning groove, a second installation hole corresponding to the first installation hole and a limiting column matched with the arc-shaped groove, the positioning protrusion is provided with an installation groove, a sealing piece is installed in the installation groove, and when the limiting column slides to one end of the arc-shaped groove along the arc-shaped groove, the first installation hole and the second installation hole are aligned. And the bolt can simultaneously penetrate through the first mounting hole and the second mounting hole. According to the utility model, the positioning bulge is matched with the positioning groove, so that the mounting and positioning effects are achieved, meanwhile, the sealing is ensured, the conditions of damage and failure of the sealing element due to excessive pressure are effectively avoided, and the working stability of the sealing element is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of flanges, and in particular to a low-temperature resistant carbon steel flange. Background Art

[0002] Low-temperature carbon steel flanges are flanges made of carbon steel and designed for use in low-temperature environments. They are primarily used to connect pipe ends. During connection, the flat faces of the two flanges are butted against each other and then bolted together. To improve the sealing performance of the flange connection and prevent gas or liquid leakage, a gasket is typically installed between the flat faces of the two flanges. During installation, the gasket is compressed between the two flanges, creating a seal. Gaskets are typically made of rubber. After production, rubber gaskets have a specific load rating, also known as a safe load capacity. When the compressive force between the two flanges exceeds this rated load, the gasket fails, compromising the seal between the flanges. Therefore, the load rating of the rubber gasket can complicate installation. If the flanges are too loose, the gasket's sealing is compromised. If the flanges are too tight, the gasket may fail due to excessive pressure. At the same time, during installation, the two flanges need to be adjusted to align in order to facilitate the installation of bolts. The process of adjusting the flanges is relatively cumbersome and requires the two flanges to be frequently moved relative to each other, which greatly reduces the installation efficiency. Utility Model Content

[0003] The technical problem to be solved by the present invention is that in the prior art, the rubber gaskets arranged between the flanges are easily invalidated or damaged due to excessive pressure. Based on this, the present invention provides a low-temperature resistant carbon steel flange which can prevent the seal from being damaged or invalidated.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a low-temperature resistant carbon steel flange, including a first flange, a second flange and a bolt, the first flange having a first docking surface, the second flange having a second docking surface that is in contact with the first docking surface, the first docking surface being provided with a positioning groove, a first mounting hole and an arc groove, the second docking surface being provided with a positioning protrusion that cooperates with the positioning groove, a second mounting hole corresponding to the first mounting hole and a limiting column that cooperates with the arc groove, a mounting groove being provided on the surface of the positioning protrusion away from the second docking surface, a sealing member being installed in the mounting groove, the sealing member being elastically deformed when the first docking surface and the second docking surface are in contact, when the limiting column slides along the arc groove to one end of the arc groove, the first mounting hole and the second mounting hole are aligned, and the bolt can pass through the first mounting hole and the second mounting hole at the same time.

[0005] Further, the first mounting hole is located between the positioning groove and the arc-shaped groove.

[0006] Further, the longitudinal section of the positioning groove and the longitudinal section of the positioning protrusion are both isosceles trapezoidal structures, the inner and outer ring groove walls of the positioning groove and the two side walls of the positioning protrusion are respectively fitted, and the groove bottom wall of the positioning groove and the space between the positioning protrusion and the second abutting surface away from the second abutting surface form a containing groove, and the sealing element is fixedly extruded between the containing groove and the mounting groove.

[0007] Further, the height of the positioning protrusion is less than the groove depth of the positioning groove.

[0008] Further, the center of the arc-shaped groove is located on the central axis of the first flange, and the limiting column is a cylindrical structure and is perpendicular to the second abutting surface.

[0009] Further, the groove depth of the arc-shaped groove is greater than the length of the limiting column.

[0010] Further, the arc-shaped groove has two, and the two arc-shaped grooves are oppositely arranged, and the limiting column has two, and one limiting column is matched with one arc-shaped groove.

[0011] Further, the first mounting hole and the second mounting hole both have multiple and one-to-one correspondence, and multiple first mounting holes are uniformly arranged along the circumference of the first flange.

[0012] The low-temperature-resistant carbon steel flange has the advantages that the cooperation between the positioning protrusion and the positioning groove plays a preliminary positioning role on the installation operation, ensures that the first flange and the second flange are in a coaxial state, then the second flange is rotated relative to the first flange until the limiting column abuts against one end groove wall of the limiting groove, the first mounting hole and the second mounting hole are aligned, the position between the first flange and the second flange is quickly adjusted to the position by the operator, the installation efficiency of the bolt is greatly improved, after installation, the first abutting surface and the second abutting surface are mutually fitted, the sealing element is further compressed, the sealing is ensured, the damage and failure of the sealing element due to excessive compression are effectively avoided, and the working stability of the sealing element is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0013] The utility model makes further explanation in connection with the drawings and examples.

[0014] Figure 1 is the explosion map of the low-temperature-resistant carbon steel flange of the utility model;

[0015] Figure 2 is Figure 1 the explosion map of another view of the low-temperature-resistant carbon steel flange shown in the figure;

[0016] Figure 3 This is the front view of the low-temperature resistant carbon steel flange of the utility model;

[0017] Figure 4 yes Figure 3 The cross-sectional view of the low-temperature resistant carbon steel flange along AA is shown;

[0018] Figure 5 yes Figure 4 A partial enlarged view of point B in the low-temperature resistant carbon steel flange shown.

[0019] In the figure: 1. first flange, 110. first docking surface, 11. positioning groove, 12. first mounting hole, 13. arc-shaped groove, 111. accommodating cavity, 2. second flange, 210. second docking surface, 21. positioning protrusion, 22. second mounting hole, 23. limiting column, 24. mounting groove, 25. sealing member, 3. bolt, 4. nut. DETAILED DESCRIPTION

[0020] The present invention will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0021] See also Figure 1-Figure 5 The utility model provides a low-temperature resistant carbon steel flange, including a first flange 1, a second flange 2 and a bolt 3. The first flange 1 has a first docking surface 110, and the second flange 2 has a second docking surface 210 that fits with the first docking surface 110. The first docking surface 110 is provided with a positioning groove 11, a first mounting hole 12 and an arc groove 13. The positioning groove 11 is an annular structure. The second docking surface 210 is provided with a positioning protrusion 21 that matches the positioning groove 11, a second mounting hole 22 corresponding to the first mounting hole 12 and a second mounting hole 23 that matches the arc groove 13. The matching limiting column 23 and the positioning protrusion 21 are provided with an installation groove 24 on the surface away from the second docking surface 210, and a sealing member 25 is installed in the installation groove 24. The sealing member 25 protrudes to the outside of the installation groove 24. The sealing member 25 is elastically deformed when the first docking surface 110 and the second docking surface 210 are in contact. The limiting column 23 can slide along the arc groove 13. When the limiting column 23 slides to one end of the arc groove 13, the first mounting hole 12 and the second mounting hole 22 are aligned, and the bolt 3 can pass through the first mounting hole 12 and the second mounting hole 22 at the same time.

[0022] When installing the low-temperature resistant carbon steel flange of the present invention, the positioning protrusion 21 is first aligned with the positioning groove 11, and then the first docking surface 110 and the second docking surface 210 are aligned with each other and connected. The cooperation between the positioning protrusion 21 and the positioning groove 11 ensures that the first flange 1 and the second flange 2 are in a coaxial state, which plays a preliminary positioning role for the installation between the two flanges. At the same time, one end of the limiting post 23 extends into the arc-shaped groove 13. At this time, the second flange 2 is rotated relative to the first flange 1. When the limiting post 23 is rotated to abut against one end of the arc-shaped groove 13, the first mounting hole 12 and the second mounting hole 22 are aligned. The installer can then pass the bolt 3 through the first mounting hole 12 and the second mounting hole 22 at the same time, and then lock the second flange 2 on the first flange 1 through the nut 4. During the process of screwing in the nut 4, the seal 25 is gradually squeezed and deformed by the bottom wall of the positioning groove 11. When the first docking surface 110 and the second docking surface 210 are in contact, the degree of deformation of the seal 25 reaches its limit and cannot be further deformed. Therefore, while ensuring sealing, it also effectively avoids damage or failure of the seal 25 due to excessive pressure. In specific implementation, the expected compression amount of the seal 25 can be determined in the design stage as needed. As a preferred embodiment, the seal 25 is made of rubber material.

[0023] In this embodiment, the first mounting hole 12 is located between the positioning groove 11 and the arc groove 13. Thus, through the above-mentioned arrangement, the seal 25 is located on the inner side of the bolt 3, ensuring that the gas or liquid medium passing between the first flange 1 and the second flange 2 will not contact the bolt 3, avoiding excessive aging and erosion of the bolt 3, extending the service life of the bolt 3, and thus ensuring the connection reliability between the first flange 1 and the second flange 2.

[0024] See also Figure 5 As a preferred embodiment, the longitudinal cross-sections of the positioning groove 11 and the positioning protrusion 21 both have isosceles trapezoidal structures. When the positioning protrusion 21 and the positioning groove 11 are installed, the inner and outer annular groove walls of the positioning groove 11 mate with the two side walls of the positioning protrusion 21, and the space between the bottom wall of the positioning groove 11 and the positioning protrusion 21, away from the second mating surface 210, forms an accommodating cavity 111. The seal 25 is squeezed and fixed between the accommodating cavity 111 and the installation groove 24. The positioning groove 11 and the positioning protrusion 21, both with trapezoidal cross-sections, facilitate positioning and mating. During installation, when the inner and outer annular groove walls of the positioning groove 11 mate with the two side walls of the positioning protrusion 21, the first mating surface 110 and the second mating surface 210 are also in a mating state. Furthermore, the height of the positioning protrusion 21 is less than the depth of the positioning groove 11, ensuring that when the two mate, the accommodating cavity 111 is formed to accommodate the seal 25.

[0025] In addition, there are multiple first mounting holes 12 and second mounting holes 22 in one-to-one correspondence. The multiple first mounting holes 12 are evenly arranged along the circumference of the first flange 1 to ensure that the first flange 1 and the second flange 2 are subjected to balanced forces.

[0026] As a preferred embodiment, the center of the arc groove 13 is located on the central axis of the first flange 1, and the limiting column 23 is a cylindrical structure and is perpendicular to the second docking surface 210 to ensure that when the second flange 2 is rotated relative to the first flange 1, the limiting column 23 can slide along the arc groove 13.

[0027] Furthermore, the depth of the arcuate groove 13 is greater than the length of the limiting post 23, preventing the limiting post 23 from abutting against the bottom wall of the arcuate groove 13 before the first and second mating surfaces 110 and 210 are aligned, thereby hindering the normal installation of the first and second flanges 1 and 2. Furthermore, there are two arcuate grooves 13, which are arranged opposite each other, and there are also two limiting posts 23, with one limiting post 23 engaging with each arcuate groove 13.

[0028] The low-temperature resistant carbon steel flange of the present invention, the cooperation between the positioning protrusion 21 and the positioning groove 11, plays a preliminary positioning role in the installation operation, ensuring that the first flange 1 and the second flange 2 are in a coaxial state, and then the second flange 2 is rotated relative to the first flange 1 until the limiting column 23 is in contact with the groove wall at one end of the limiting groove 11, and the first mounting hole 12 and the second mounting hole 22 are aligned, which helps the operator to quickly adjust the position between the two, greatly improving the installation efficiency of the bolt 3. After installation, the first docking surface 110 and the second docking surface 210 fit each other, limiting the further compression of the seal 25. While ensuring sealing, it also effectively avoids damage and failure of the seal 25 due to excessive pressure, thereby ensuring the working stability of the seal 25.

[0029] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the scope of the present invention. The technical scope of this utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A low-temperature resistant carbon steel flange, comprising a first flange, a second flange, and bolts, wherein the first flange has a first butt joint surface, and the second flange has a second butt joint surface that abuts against the first butt joint surface, characterized in that: The first docking surface is provided with a positioning groove, a first mounting hole and an arc-shaped groove, the second docking surface is provided with a positioning protrusion cooperating with the positioning groove, a second mounting hole corresponding to the first mounting hole and a limiting column cooperating with the arc-shaped groove, a mounting groove is provided on the surface of the positioning protrusion away from the second docking surface, a sealing member is installed in the mounting groove, and the sealing member is elastically deformed when the first docking surface and the second docking surface are in contact, when the limiting column slides along the arc-shaped groove to one end of the arc-shaped groove, the first mounting hole and the second mounting hole are aligned, and the bolt can pass through the first mounting hole and the second mounting hole at the same time.

2. The low-temperature resistant carbon steel flange according to claim 1, characterized in that: The first mounting hole is located between the positioning groove and the arc groove.

3. The low temperature resistant carbon steel flange according to claim 1, characterized in that: The longitudinal cross-sections of the positioning groove and the positioning protrusion are both isosceles trapezoidal structures, the inner and outer ring groove walls of the positioning groove are respectively fitted with the two side walls of the positioning protrusion, and the bottom wall of the positioning groove and the space between the positioning protrusion away from the second docking surface form a receiving groove, and the seal is squeezed and fixed between the receiving groove and the installation groove.

4. The low-temperature resistant carbon steel flange according to claim 3, characterized in that: The height of the positioning protrusion is smaller than the depth of the positioning groove.

5. The low temperature resistant carbon steel flange according to claim 1, characterized in that: The center of the arc groove is located on the central axis of the first flange, and the limiting column is a cylindrical structure and is perpendicular to the second docking surface.

6. The low temperature resistant carbon steel flange according to claim 5, characterized in that: The depth of the arc-shaped groove is greater than the length of the limiting column.

7. The low-temperature resistant carbon steel flange according to claim 5, characterized in that: There are two arc-shaped grooves, and the two arc-shaped grooves are arranged opposite to each other. There are two limiting pillars, and one limiting pillar is matched with one arc-shaped groove.

8. The low temperature resistant carbon steel flange according to claim 1, characterized in that: There are multiple first mounting holes and multiple second mounting holes in one-to-one correspondence, and the multiple first mounting holes are evenly arranged along the circumference of the first flange.

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