High-pressure double-seal flange joint

Abstract

The utility model discloses a high-pressure double-sealing flange joint, which belongs to the technical field of pipeline equipment and comprises a first flange, a second flange and a sealing ring, the first flange is provided with a first butt joint surface and a first shaft hole, and the second flange is provided with a second butt joint surface and a second shaft hole. The first butt joint face and the second butt joint face are in butt joint. The first shaft hole communicates with the second shaft hole. A sealing boss is arranged on the first butt joint face, the sealing boss protrudes out of the first butt joint face and surrounds the first shaft hole, and a sealing groove is formed in the end face of the sealing boss. A sealing groove is formed in the second butt joint surface, and the sealing groove is concaved in the second butt joint surface; the sealing boss extends into the sealing groove, the sealing ring is located in the sealing groove, and sealing is formed at the butt joint position of the first shaft hole and the second shaft hole. Butt-joint sealing of the sealing boss and the sealing groove is achieved between the first flange and the second flange, annular sealing formed by the sealing ring is achieved, multiple sealing is achieved, the sealing effect is good, and the sealing performance of the flange connector is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline equipment, and particularly relates to a high-pressure double-sealed flange joint. Background Art

[0002] At present, flanges are usually single-sealed flanges, and the flange sealing surface types are divided into: convex surface, concave surface / convex surface, tongue and groove surface, full plane, ring joint surface. For such single-sealed flanges, the sealing effect is limited and leakage is likely to occur. In some cases with strict requirements: for example, in the amine high-pressure flashing process system, the leakage of amine will cause harm to personnel and the environment. Another example is the oil and gas metering system, where leakage will result in inaccurate metering results. Double-sealed flanges have a better sealing effect than single-sealed flanges. For cases with strict sealing requirements, double-sealed flanges need to be used. However, at present, the types of double-sealed flanges are relatively few and the structure is relatively complex.

[0003] To solve the problems existing in the above-mentioned prior art, the present invention aims to provide a double-sealed flange to improve the sealing performance of the flange. Content of the Utility Model

[0004] Regarding the problems existing in the prior art, the utility model provides a high-pressure double-sealed flange joint, which has a simple structure and a good sealing effect.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] The utility model provides a high-pressure double-sealed flange joint, including a first flange, a second flange and a sealing ring. The first flange has a first butt joint surface and a first shaft hole, the second flange has a second butt joint surface and a second shaft hole, the first butt joint surface and the second butt joint surface are butted and the first shaft hole and the second shaft hole are communicated;

[0007] A sealing boss is arranged on the first butt joint surface, the sealing boss protrudes out of the first butt joint surface and surrounds the first shaft hole, and an annular sealing groove is formed on the end surface of the sealing boss;

[0008] A sealing groove is arranged on the second butt joint surface, and the sealing groove is recessed in the second butt joint surface;

[0009] The sealing boss extends into the sealing groove, and the sealing ring is located in the sealing groove, so as to form a seal at the butt joint of the first shaft hole and the second shaft hole.

[0010] In the above-mentioned high-pressure double-sealed flange joint, the groove width of the sealing groove gradually decreases from the groove bottom to the groove opening.

[0011] In the above-mentioned high-pressure double-sealed flange joint, the sealing groove has a first groove surface, a second groove surface, and a third groove surface that are sequentially connected;

[0012] The second groove surface is concave with respect to the end face of the sealing boss;

[0013] In the radial direction of the first flange, the first groove surface and the third groove surface are respectively located on both sides of the second groove surface; both the first groove surface and the third groove surface extend from the end face of the sealing boss to the second groove surface;

[0014] At least the third groove surface is a conical surface, and one end of the third groove surface connected to the second groove surface is inclined away from the first groove surface.

[0015] In the above-mentioned high-pressure double-sealed flange joint, in the radial direction of the first flange, the first groove surface is located outside the third groove surface; a second transition portion is provided at the connection between the third groove surface and the end face of the sealing boss.

[0016] In the above-mentioned high-pressure double-sealed flange joint, the second transition portion is a fillet with a radius of R0.2 to R0.6.

[0017] In the above-mentioned high-pressure double-sealed flange joint, the taper of the conical surface is 60° to 75°;

[0018] And / or, the first groove surface is a cylindrical surface, and the first groove surface is coaxial with the first shaft hole;

[0019] And / or, a first transition portion is provided at the connection between the third groove surface and the second groove surface; the first transition portion is a fillet with a radius of R1.4 to R1.8;

[0020] And / or, a third transition portion is provided at the connection between the first groove surface and the second groove surface, and the third transition portion is a fillet with a radius of R0.6 to R1.0;

[0021] And / or, the second groove surface is an annular plane and is parallel to the first docking surface.

[0022] In the above-mentioned high-pressure double-sealed flange joint, the sealing groove has at least a fourth groove surface and a fifth groove surface;

[0023] The fifth groove surface is concave with respect to the second docking surface, and the fifth groove surface surrounds the second shaft hole;

[0024] In the radial direction of the second flange, the fourth groove surface is located outside the fifth groove surface, and the outer edge of the fourth groove surface connecting the fifth groove surface is connected to the second docking surface.

[0025] In the above-mentioned high-pressure double-sealed flange joint, the fifth groove surface is an annular plane and is parallel to the second docking surface;

[0026] And / or, a transition surface is provided at the junction of the fourth groove surface and the second docking surface, and the transition surface is a conical surface;

[0027] And / or, the fourth groove surface is a cylindrical surface and is coaxial with the second shaft hole;

[0028] And / or, the depth of the fifth groove surface recessed from the second docking surface is less than the height of the sealing boss protruding from the first docking surface.

[0029] In the above-mentioned high-pressure double-sealed flange joint, a first spraying limit hole is provided on the end surface of the first shaft hole adjacent to the first docking surface, and the aperture of the first spraying limit hole is larger than that of the first shaft hole, forming a shield on the outside of the first shaft hole;

[0030] A second spraying limit hole is provided on the end surface of the second shaft hole adjacent to the second docking surface, and the inner diameter of the second spraying limit hole is larger than the inner diameter of the second shaft hole, forming a shield on the outside of the second shaft hole.

[0031] In the above-mentioned high-pressure double-sealed flange joint, the second spraying limit hole is a circular hole and is coaxial with the second shaft hole;

[0032] And / or, the first spraying limit hole is a circular hole and is coaxial with the first shaft hole;

[0033] And / or, the hole depths of the first spraying limit hole and the second spraying limit hole are 0.30 mm to 0.38 mm;

[0034] And / or, the minimum distance between the first spraying limit hole and the inner wall of the first shaft hole is 4 mm to 6 mm, and the minimum distance between the second spraying limit hole and the inner wall of the second shaft hole is 4 mm to 6 mm.

[0035] The beneficial effects of the present invention are as follows:

[0036] The flange joint composed of the first flange, the second flange, and the sealing ring has both the butt joint seal between the sealing boss and the sealing groove and the annular seal formed by the sealing ring, with multiple seals, good sealing effect, and greatly improved sealing performance of the flange joint;

[0037] In the technical solution of the present application, the shape of the sealing groove is optimized, and the embedded sealing groove can prevent the sealing ring from slipping off;

[0038] The second transition part connects the third groove surface and the end face of the sealing boss, which can avoid scratching the sealing ring by sharp corners, and at the same time has a guiding effect on the entry of the sealing ring. Moreover, the machining amount required for the second fillet is not large, and it will not cause too much increase in processing costs;

[0039] The third transition part and the first transition part can reduce the stress concentration caused by right angles, and can make the sealing ring and the sealing groove form a better seal, and the machining amount is not large and the processing cost is not high;

[0040] The first spraying limit hole and the second spraying limit hole can quickly identify and judge the spraying range and thickness limit in actual spraying work, effectively avoiding the influence of internal spraying on flange sealing. Brief Description of the Drawings

[0041] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the high-pressure double-sealing flange joint of the present utility model;

[0042] Figure 2 is Figure 1 an enlarged view of area A in;

[0043] Figure 3 It is a schematic diagram of the overall structure of the first flange in the high-pressure double-sealing flange joint of the present utility model;

[0044] Figure 4 is Figure 3 an enlarged view of area C in;

[0045] Figure 5 It is a schematic diagram of the overall structure of the second flange in the high-pressure double-sealing flange joint of the present utility model;

[0046] Figure 6 is Figure 5 an enlarged view of area D in.

[0047] In the figure:

[0048] 1 - First flange; 101 - First butt joint surface; 102 - First shaft hole; 103 - Sealing boss; 104 - Sealing groove; 105 - First extended surface; 106 - First shielding surface; 107 - Third groove surface; 108 - Second transition part; 109 - Second groove surface; 110 - First groove surface; 111 - Third transition part; 112 - First transition part;

[0049] 2 - Second flange; 201 - Second butt joint surface; 202 - Second shaft hole; 203 - Sealing groove; 204 - Fifth groove surface; 205 - Transition surface; 206 - Second shielding surface; 207 - Second extended surface; 208 - Fourth groove surface;

[0050] 3 - Sealing ring. Detailed Description of the Invention

[0051] For the convenience of those skilled in the art to understand, the following further describes the present utility model in conjunction with the accompanying drawings.

[0052] Please refer to Figures 1-6 , which is an embodiment of a high-pressure double-sealed flange joint provided by the present utility model, including a first flange 1, a second flange 2 and a sealing ring 3. The first flange 1 has a first docking surface 101 and a first shaft hole 102, the second flange 2 has a second docking surface 201 and a second shaft hole 202, the first docking surface 101 and the second docking surface 201 are docked and the sealing ring 3 is located between the first flange 1 and the second flange 2 to form a seal; the first shaft hole 102 and the second shaft hole 202 are communicated. In actual use, the first flange 1 and the second flange 2 are respectively connected to two pipelines to be connected, and then the first flange 1 and the second flange 2 are detachably connected by using a bolt and nut assembly. The first flange 1 and the second flange 2 also have existing structures such as bolt holes and reduced-diameter parts, and the present application does not improve them, so no detailed description is given here.

[0053] In order to improve the connection sealing performance of the first flange 1 and the second flange 2, please refer to Figure 3 and Figure 4 , a sealing boss 103 is provided on the first docking surface 101 of the first flange 1. The sealing boss 103 surrounds the first shaft hole 102, preferably coaxially arranged with it, and the sealing boss 103 extends radially to the first shaft hole 102, that is, the inner diameter of the sealing boss 103 is equal to the aperture of the first shaft hole 102. Of course, if necessary, a certain distance can be set between the sealing boss 103 and the first shaft hole 102, that is, the inner diameter of the sealing boss 103 is greater than the aperture of the first shaft hole 102.

[0054] The end face of the sealing boss 103 has an annular sealing groove 104, and the sealing ring 3 is located in the sealing groove 104; the sealing ring 3 also surrounds the first shaft hole 102.

[0055] The present application further optimizes the structure of the sealing groove 104, specifically shown in, please refer to Figure 4 , the sealing groove 104 has a first groove surface 110, a second groove surface 109, and a third groove surface 107 that are sequentially connected. The second groove surface 109 is concave with respect to the end face of the sealing boss 103. In the radial direction of the first flange 1, the third groove surface 107 is located inside the first groove surface 110. In the axial direction of the first flange 1, both the first groove surface 110 and the third groove surface 107 extend from the end face of the sealing boss 103 to the second groove surface 109; at least one of the first groove surface 110 and the third groove surface 107 is an inclined conical surface. In this way, an embedded sealing groove 104 is formed, and the groove width near the opening of the sealing groove 104 is smaller than the groove width inside it, which can prevent the sealing ring 3 from slipping out of the sealing groove 104.

[0056] For example, the first groove surface 110 is a cylindrical surface, preferably coaxial with the first shaft hole 102; the third groove surface 107 is a conical surface, and one end thereof connected to the second groove surface 109 is inclined away from the first groove surface 110. Alternatively, both the first groove surface 110 and the third groove surface 107 are conical surfaces, and one ends thereof connected to the second groove surface 109 face away from each other, so that the width of the sealing groove 104 becomes smaller closer to the second groove surface 109.

[0057] Whether one or both of the first groove surface 110 and the third groove surface 107 are conical surfaces, preferably, the taper of the conical surface is 60° to 75°.

[0058] Furthermore, a second transition portion 108 is provided at the connection between the third groove surface 107 and the end face of the sealing boss 103, and the second transition portion 108 is a fillet with a radius of R0.2 to R0.6. The second transition portion 108 provides a guiding function for the sealing ring 3 to enter the sealing groove 104, and can prevent the sealing ring 3 from being scratched by sharp corners, enabling the sealing ring 3 to be more easily inserted into the sealing groove 104.

[0059] A first transition portion 112 is provided at the connection between the third groove surface 107 and the second groove surface 109, and the first transition portion 112 is a fillet with a radius of R1.4 to R1.8; a third transition portion 111 is provided at the connection between the inner end of the first groove surface 110 and the second groove surface 109, and the third transition portion 111 is a fillet with a radius of R0.6 to R1.0. The third transition portion 111 and the first transition portion 112 can reduce stress concentration caused by sharp corners and enable the sealing ring 3 to better fit the inner surface of the sealing groove 104.

[0060] Please refer to Figure 5 and Figure 6 , an inwardly concave sealing groove 203 is provided on the second docking surface 201 of the second flange 2, the sealing boss 103 extends into the sealing groove 203, and the sealing ring 3 forms a seal at the sealing groove 203 and the sealing boss 103.

[0061] As an embodiment of the sealing groove 203, the sealing groove 203 has at least a fourth groove surface 208 and a fifth groove surface 204; that is, the sealing groove 203 is a circular groove provided on the second docking surface 201 and communicates with the second shaft hole 202; preferably coaxial and communicating. The fifth groove surface 204 surrounds the second shaft hole 202 and is parallel to the second docking surface 201; the fourth groove surface 208 is a cylindrical surface, and in the radial direction of the second flange 2, the fourth groove surface 208 is located outside the fifth groove surface 204 and is connected to the outer edge of the fifth groove surface 204. A transition surface 205 is provided at the connection between the fourth groove surface 208 and the second docking surface 201, and the transition surface 205 is a conical surface that can be formed by a guide chamfer. The transition surface 205 can guide the sealing boss 103 into the sealing groove 203 when the first flange 1 and the second flange 2 are docked.

[0062] According to actual needs, the sealing groove 203 also adopts a ring groove design, that is, the inner diameter of the sealing groove 203 is larger than the aperture of the second shaft hole 202; at this time, the sealing groove 203 not only has a fourth groove surface 208 and a fifth groove surface 204, but also has another groove surface forming the inner wall of the ring groove.

[0063] Furthermore, the depth of the fifth groove surface 204 recessed in the second docking surface 201 is less than the height of the sealing boss 103 protruding from the first docking surface 101. After the sealing ring 3 contacts the fifth groove surface 204, a gap is left between the first docking surface 101 and the second docking surface 201, so as to ensure that the sealing ring 3 is completely in a compressed state.

[0064] The flange joint composed of the first flange 1, the second flange 2, and the sealing ring 3 has both the butt joint seal between the sealing boss 103 and the sealing groove 203 and the ring connection surface seal formed by the sealing ring 3. It has multiple seals, good sealing effect, and can be applied to high-pressure environments; the shape of the sealing groove 104 is optimized to effectively prevent the sealing ring 3 from slipping off.

[0065] Furthermore, the end surface of the second shaft hole 202 is flush with the fifth groove surface 204, and the end surface of the first shaft hole 102 is also flush with the end surface of the sealing boss 103, which simplifies the structures of the first flange 1 and the second flange 2 and simplifies the processing technology. To prevent the internal spraying of the first shaft hole 102 and the second shaft hole 202 from affecting the sealing performance, a first spraying limit hole is provided on the end surface of the first shaft hole 102 adjacent to the first docking surface 101, and a second spraying limit hole is provided on the end surface of the second shaft hole 202 adjacent to the second docking surface 201. The first spraying limit hole and the second spraying limit hole can identify and limit the spraying position.

[0066] Specifically, the first spraying limit hole communicates with the first shaft hole 102, and the aperture of the first spraying limit hole is larger than that of the first shaft hole 102, extending outward from the first shaft hole 102 to form a first extended surface 105 and a first shielding surface 106. The first extended surface 105 is an annular plane surrounding the outside of the first shaft hole 102 and recessed in the end surface of the sealing boss 103; the first shielding surface 106 extends and connects between the end surface of the sealing boss 103 and the first extended surface 105 to form a shielding outside the first shaft hole 102. The cross-sectional shape of the first spraying limit hole can be designed according to needs, but is preferably circular. The first shielding surface 106 is a cylindrical surface, and the first extended surface 105 is a circular ring-shaped plane.

[0067] The second spraying limit hole communicates with the second shaft hole 202. The inner diameter of the second spraying limit hole is larger than that of the second shaft hole 202 and extends outward from the second shaft hole 202, forming a second extended surface 207 and a second shielding surface 206. The second extended surface 207 is an annular plane that surrounds the outside of the second shaft hole 202 and is concave to the fifth groove surface 204. The second shielding surface 206 extends and joins between the fifth groove surface 204 and the second extended surface 207, forming a shielding outside the second shaft hole 202. The cross-sectional shape of the second spraying limit hole can also be designed according to needs, but is preferably circular, that is, the second shielding surface 206 is a cylindrical surface and the second extended surface 207 is a circular ring-shaped plane.

[0068] The hole depths of the first spraying limit hole and the second spraying limit hole are 0.30 mm to 0.38 mm. If it is less than this depth, it may not cover the thickness of the inner sprayed paint film. If it is greater than this depth, it will weaken the strength of the first flange 1 and the second flange 2 itself and increase the machining cost. The range of the minimum distance between the first shielding surface 106 and the first shaft hole 102 is 4 mm to 6 mm, and the range of the minimum distance between the second shielding surface 206 and the second shaft hole 202 is 4 mm to 6 mm. That is, in the radial direction, it is ensured that the first extended surface 105 and the second extended surface 207 have sufficient and effective extended areas to ensure that the inner spraying of the flange does not exceed the first extended surface 105 and the second extended surface 207. Controlling the spraying thickness and spraying range within the first spraying limit hole and the second spraying limit hole effectively prevents the influence of the inner spraying range and thickness on the flange seal.

[0069] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-pressure double-sealed flange joint, comprising a first flange (1), a second flange (2) and a sealing ring (3). The first flange (1) has a first butt joint surface (101) and a first shaft hole (102), the second flange (2) has a second butt joint surface (201) and a second shaft hole (202), the first butt joint surface (101) and the second butt joint surface (201) are butted and the first shaft hole (102) and the second shaft hole (202) are communicated; characterized in that, a sealing boss (103) is arranged on the first butt joint surface (101), the sealing boss (103) protrudes out of the first butt joint surface (101) and surrounds the first shaft hole (102), and an annular sealing groove (104) is formed on the end surface of the sealing boss (103); a sealing groove (203) is arranged on the second butt joint surface (201), and the sealing groove (203) is recessed in the second butt joint surface (201); the sealing boss (103) extends into the sealing groove (203), and the sealing ring (3) is located in the sealing groove (104), so as to form a seal at the butt joint of the first shaft hole (102) and the second shaft hole (202).

2. The high-pressure double-sealed flange joint according to claim 1, characterized in that, The groove width of the sealing groove (104) gradually decreases from the groove bottom to the groove opening.

3. The high-pressure double-sealed flange joint according to claim 2, wherein, The sealing groove (104) has a first groove surface (110), a second groove surface (109) and a third groove surface (107) which are connected in sequence; the second groove surface (109) is recessed in the end surface of the sealing boss (103); in the radial direction of the first flange (1), the first groove surface (110) and the third groove surface (107) are respectively located on both sides of the second groove surface (109); both the first groove surface (110) and the third groove surface (107) extend from the end surface of the sealing boss (103) to the second groove surface (109); at least the third groove surface (107) is a conical surface, and one end of the third groove surface (107) connected with the second groove surface (109) inclines towards the side away from the first groove surface (110).

4. The high-pressure double-sealed flange joint according to claim 3, characterized in that, In the radial direction of the first flange (1), the first groove surface (110) is located outside the third groove surface (107); a second transition part (108) is arranged at the connection of the third groove surface (107) and the end surface of the sealing boss (103).

5. A high-pressure double-sealed flange joint according to claim 4, characterized in that, The second transition part (108) is a fillet with a radius of R0.2 to R0.

6.

6. The high-pressure double-sealed flange joint according to claim 3, characterized in that, The taper of the conical surface is 60° to 75°; and / or, the first groove surface (110) is a cylindrical surface, and the first groove surface (110) is coaxial with the first shaft hole (102); and / or, a first transition part (112) is arranged at the connection of the third groove surface (107) and the second groove surface (109); the first transition part (112) is a fillet with a radius of R1.4 to R1.8; and / or, a third transition part (111) is arranged at the connection of the first groove surface (110) and the second groove surface (109), and the third transition part (111) is a fillet with a radius of R0.6 to R1.0; And / or, the second groove surface (109) is an annular plane, parallel to the first docking surface (101).

7. The high-pressure double-sealed flange joint according to claim 1, characterized in that, The sealing groove (203) has at least a fourth groove surface (208) and a fifth groove surface (204); The fifth groove surface (204) is recessed in the second docking surface (201), and the fifth groove surface (204) surrounds the second shaft hole (202); In the radial direction of the second flange (2), the fourth groove surface (208) is located outside the fifth groove surface (204), and connects the outer edge of the fifth groove surface (204) with the second docking surface (201).

8. The high-pressure double-sealed flange joint according to claim 7, characterized in that, The fifth groove surface (204) is an annular plane, parallel to the second docking surface (201); And / or, a transition surface (205) is provided at the junction of the fourth groove surface (208) and the second docking surface (201), and the transition surface (205) is a conical surface; And / or, the fourth groove surface (208) is a cylindrical surface and is coaxial with the second shaft hole (202); And / or, the depth that the fifth groove surface (204) is recessed in the second docking surface (201) is less than the height that the sealing boss (103) protrudes from the first docking surface (101).

9. The high-pressure double-sealing flange joint according to claim 1, characterized in that, A first spraying limiting hole is provided on the end surface of the first shaft hole (102) adjacent to the first docking surface (101), and the aperture of the first spraying limiting hole is larger than that of the first shaft hole (102), forming an obstruction outside the first shaft hole (102); A second spraying limiting hole is provided on the end surface of the second shaft hole (202) adjacent to the second docking surface (201), and the inner diameter of the second spraying limiting hole is larger than the inner diameter of the second shaft hole (202), forming an obstruction outside the second shaft hole (202).

10. A high-pressure double-sealed flange joint according to claim 9, characterized in that, The second spraying limiting hole is a circular hole and is coaxial with the second shaft hole (202); And / or, the first spraying limiting hole is a circular hole and is coaxial with the first shaft hole (102); And / or, the hole depths of the first spraying limiting hole and the second spraying limiting hole are 0.30 mm to 0.38 mm; And / or, the minimum distance between the first spraying limiting hole and the inner wall of the first shaft hole (102) is 4 mm to 6 mm, and the minimum distance between the second spraying limiting hole and the inner wall of the second shaft hole (202) is 4 mm to 6 mm.

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