High-temperature-corrosion-resistant sealed flange

Abstract

The utility model relates to the technical field of machinery, in particular to a high-temperature-corrosion-resistant sealed flange which comprises a first flange plate and a second flange plate, an outer lip ring and an inner lip ring are arranged on the connecting face of the first flange plate at a certain interval, and a sealing washer is arranged between the outer lip ring and the inner lip ring in a sleeved mode. An outermost layer annular area, a secondary outer layer annular area and an inner layer annular area are arranged on the connecting face of the second flange plate, the outermost layer annular area and the inner layer annular area are grooves, the inner layer annular area is connected with the inner lip ring in a matched mode, the outermost layer annular area is connected with the outer lip ring in a matched mode, and the secondary outer layer annular area is connected with the outer lip ring in a matched mode. The middle groove is connected with the sealing washer in a matched mode. The sealing flange is designed to be of a double-lip structure, the outer lip ring is used for preliminary sealing and bearing external pressure, the inner lip ring is provided with a tiny groove through precision machining, and effective sealing can be kept even under high-temperature deformation in cooperation with a specially-made sealing gasket.

Description

Technical Field

[0001] The utility model relates to the technical field of machinery, in particular to a sealing flange resistant to high temperature corrosion. Background Art

[0002] Flange, also called flange flange or flange, is a part that connects pipes to each other. It is used to connect pipe ends, and is also used to connect equipment inlets and outlets or structures. Flange connection is an important connection method for pipeline construction. Flange connection is easy to use and can withstand greater pressure. It is widely used in industrial pipelines.

[0003] Since some pipelines are used to pass high temperature, high pressure and corrosive media, the flanges connected to the pipelines are in a high temperature and high corrosion environment. In addition, some high temperature media have high pressure, which accelerates the aging and damage of the sealing ring in the flange, causing it to lose its sealing function, causing the fluid to overflow from the connection, affecting the normal use of the flange. Therefore, in order to solve the above problems, we provide a high temperature corrosion resistant sealing flange. Utility Model Content

[0004] In view of this, the utility model aims at the deficiencies of the prior art and proposes a high temperature corrosion resistant sealing flange. The flange is designed as a double lip structure. The outer lip is used for initial sealing and to withstand external pressure, and the inner lip is formed into a tiny groove through precision processing. In combination with a special sealing gasket, it can maintain effective sealing even under high temperature deformation.

[0005] The utility model provides a high temperature corrosion resistant sealing flange, comprising a first flange and a second flange, wherein the first flange and the second flange are both provided with a pipeline opening at their central positions, and the first flange and the second flange are respectively provided with a plurality of mounting holes corresponding to each other in an annular manner; an outer lip ring and an inner lip ring are arranged at intervals on the connecting surface of the first flange, and a sealing gasket is sleeved between the outer lip ring and the inner lip ring;

[0006] The connecting surface of the second flange plate is provided with an outermost annular area, a sub-outer annular area and an inner annular area, the sub-outer annular area is higher than the outermost annular area and the inner annular area, the outermost annular area and the inner annular area are grooves, the inner annular area is cooperated and connected with the inner lip ring, the outermost annular area is cooperated and connected with the outer lip ring, and the middle groove is cooperated and connected with the sealing gasket.

[0007] In some embodiments of the present application, the outer surface of the inner lip ring is provided with a wavy protrusion, and the inner surface of the sealing gasket is provided with a wavy groove matched with the wavy protrusion.

[0008] In some embodiments of the present application, the width of the outer lip ring is greater than the width of the memory ring, and the width of the outermost annular area is greater than the width of the inner annular area.

[0009] In some embodiments of the present application, the sealing gasket includes a flexible graphite layer and a metal mesh gasket, and the metal mesh gasket is embedded in the flexible graphite layer.

[0010] In some embodiments of the present application, a first sealing ring is disposed in the inner annular area, and a second sealing ring is disposed in the outermost annular area.

[0011] In some embodiments of the present application, the first flange and the second flange are made of chromium-nickel-iron alloy or Hastelloy.

[0012] In some embodiments of the present application, surfaces of the first flange and the second flange are coated with a ceramic coating.

[0013] In some embodiments of the present application, the first flange, the sealing gasket and the second flange are connected by alloy bolts, and a spring washer is provided between the bolts and the flange.

[0014] The utility model discloses a sealing flange resistant to high temperature corrosion. The connecting surface of the first flange is designed as a double-lip structure. The outer lip ring is the first line of defense and can withstand the direct influence of the main system pressure and the external environment. The inner lip ring is located inside the outer lip ring and has a specific corrugated structure on the surface. The matching edge is designed with a sealing gasket matching the geometric shape of the inner lip, which can ensure that a continuous and stable sealing interface is formed between the inner and outer lips, and effective sealing can be maintained even under high temperature deformation; sealing gaskets are also arranged in the inner and outermost annular areas of the second flange, respectively, and are respectively connected with the inner lip ring and the outer lip ring to further enhance the sealing effect; an adjustable spring gasket made of a special alloy is arranged between the flange and the bolt, which can automatically expand and contract according to the stress of the flange surface, compensate for the size change caused by temperature change, and maintain a constant clamping force at the flange connection; the flange adopts a high-performance alloy such as Hastelloy, and is coated with a ceramic coating on the surface, which is not only resistant to high temperature but also has extremely high resistance to a variety of corrosive media; the sealing gasket is a composite gasket reinforced with flexible graphite and metal mesh, which can improve the mechanical strength and creep resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A front view of a first flange structure of a high temperature corrosion resistant sealing flange provided by an embodiment of the utility model;

[0016] Figure 2 A front view of a second flange structure of a high temperature corrosion resistant sealing flange provided by an embodiment of the utility model;

[0017] Figure 3 A side cross-sectional view of a first flange and a second flange provided in an embodiment of the utility model;

[0018] Figure 4 A schematic diagram of the structure of a sealing gasket provided in an embodiment of the utility model;

[0019] Figure 5 A side view of a high temperature corrosion resistant sealing flange provided in an embodiment of the utility model.

[0020] Wherein: 1. mounting hole; 100. first flange; 110. outer lip ring; 120. inner lip ring; 121. wavy protrusion; 130. sealing gasket; 131. flexible graphite layer; 132. metal mesh gasket; 133. wavy groove; 200. second flange; 210. outermost annular area; 220. inner annular area; 230. first sealing ring; 240. second sealing ring; 250. sub-outer annular area; 300. alloy bolt; 310. spring washer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] The utility model provides a high temperature corrosion resistant sealing flange, which adopts high performance heat resistant alloys containing alloy elements such as nickel, chromium, molybdenum, such as Inconel 625 or Hastelloy C-276. These materials have high temperature resistance and corrosion resistance and can work for a long time in high temperature and corrosive environment. Figure 1-5 As shown, the flange includes a first flange plate 100 and a second flange plate 200, both of which are preset with a pipe opening for passing the pipe in the center, and a plurality of groups of corresponding mounting holes 1 are evenly distributed along the circumferential direction, which can ensure the stable connection between the flange and the pipe or other flange components. The connection surface of the first flange plate 100 is uniquely designed, including an outer lip ring 110 and an inner lip ring 120. The outer lip ring 110 is located at the outer edge of the flange connection surface to form an annular protrusion. The inner lip ring 120 is arranged inside the outer lip ring 110 to form a narrower annular structure. The position of the inner lip ring 120 is slightly deviated from the center of the flange, and a designed space is reserved between the inner lip ring 110 and the outer lip ring 110. A high-temperature resistant sealing gasket 130 is placed in the space between the inner and outer lip rings 110. The sealing gasket 130 has corresponding mounting holes 1 on its surface to facilitate fixing by bolts. The spacing design between the outer lip ring 110 and the inner lip ring 120 provides the necessary compression space for the sealing gasket 130, thereby enhancing the sealing effect. As shown in FIG. Figure 1 As shown, Figure 1 The left figure in the middle is a front view of the first flange, and the sealing gasket 130 is not shown; the right figure is a front view of the first flange with the sealing gasket 130 installed.

[0026] The connection surface of the second flange 200 is provided with an inner annular area 220 and an outermost annular area 210, which are respectively tightly meshed with the inner lip ring 120 and the outer lip ring 110 of the first flange 100 to form a stable mechanical connection. The sub-outer annular area 250 directly connected between the inner annular area 220 and the outermost annular area 210 is precisely fitted with the sealing gasket 130, further enhancing the tightness and reliability of the seal. The flange connection surface is a plane, and the inner annular area 220, the sub-outer annular area 250 and the outermost annular area 210 are recessed relative to the flange plane, such as Figure 3 As shown in the figure on the right.

[0027] In some specific embodiments of the present application, a first sealing ring 230 and a second sealing ring 240 are respectively embedded in the inner annular area 220 and the outermost annular area 210, providing double protection for the sealing of the flange. Figure 2 As shown, Figure 2 The left-side figure is a front view of the second flange, the first sealing ring 230 and the second sealing ring 240 are not shown, and the right-side image is a front view of the second flange with the first sealing ring 230 and the second sealing ring 240 installed.

[0028] In some specific embodiments of the present application, Figure 1 The left graph and Figure 3 As shown in the left figure of FIG. 1 , a series of wavy protrusions 121 are provided on the surface of the inner lip ring 120, such as Figure 4 As shown in the left figure of , the inner surface of the sealing gasket 130 is provided with a wave groove 133 complementary to the wave protrusion 121 of the inner lip ring 120 to ensure the precise fit between the sealing gasket 130 and the inner lip ring 120. This design can enhance the clamping force of the flange on the sealing gasket 130 when subjected to axial pressure, especially when the flange connection surface expands or contracts due to temperature changes, the corrugated structure can provide additional elastic deformation space to maintain sealing continuity, and the corrugation can also disperse stress to a certain extent, reduce local overload on the flange connection surface, and extend the service life of the flange and the sealing gasket 130.

[0029] It should be noted that the corrugated structure can be continuous corrugations that are evenly distributed, or individual wave peaks that are spaced apart. The specific shape depends on the flange size, application environment, and desired sealing performance.

[0030] In some specific embodiments of the present application, Figure 1-Figure 3 As shown, the outer lip ring 110 is the first line of defense and is wider and thicker than the inner lip ring 120. Accordingly, the width and thickness of the outermost annular area 210 are also greater than those of the inner annular area 220. The outer lip ring 110 and the outermost annular area 210 are connected to withstand the main system pressure and the direct influence of the external environment. Such a size difference optimizes the overall pressure bearing capacity and sealing stability of the flange. The outer lip ring 110 can also be provided with a slight taper, which helps to automatically center during the assembly process and ensure uniform distribution of the clamping force.

[0031] During the installation process, when the flange is tightened by bolts or other fasteners, the outer lip ring 110 first contacts and presses the second flange 200, and then as the tightening force increases, the inner lip ring 120 also starts to play a role, interacting with the sealing gasket 130 through its specific geometric shape or structure (such as micro grooves or corrugations), further enhancing the sealing effect. This design allows the inner and outer lip rings to share the pressure together, adapt to the small displacement of the flange surface caused by temperature changes or pressure fluctuations, and maintain the continuity and stability of the seal.

[0032] In some specific embodiments of the present application, a sub-outer annular area 250 is provided between the inner annular area 220 and the outermost annular area 210. The depth of the sub-outer annular area 250 is shallower than that of the inner annular area 220 and the outermost annular area 210, and it fits precisely with the sealing gasket 130, thereby further enhancing the tightness and reliability of the seal.

[0033] In some specific embodiments of the present application, Figure 4 As shown in the figure on the right, the sealing gasket 130 adopts a composite gasket reinforced with flexible graphite and metal mesh, including a flexible graphite layer 131 and a metal mesh gasket 132 embedded in the graphite layer. Graphite has good self-lubricity and high-temperature stability. The metal mesh gasket 132 (such as 316L stainless steel) is reinforced to improve the mechanical strength and creep resistance of the sealing gasket 130. The metal mesh also improves the structural stability of the sealing gasket 130 to ensure that it is not prone to rupture or excessive compression deformation under high pressure.

[0034] In some specific embodiments of the present application, a high-temperature ceramic coating, such as aluminum oxide or zirconium oxide, is coated on the surface of the flange to further improve the corrosion resistance and heat insulation performance.

[0035] like Figure 5 As shown, in some specific embodiments of the present application, the first flange 100, the sealing gasket 130 and the second flange 200 are fastened and connected by high-strength alloy bolts 300, and a spring washer 310 is arranged between the bolt and the flange, and the spring washer 310 is placed between the flange and the nut or between the flange and the nut. The spring washer 310 uses its own elastic deformation to automatically adjust the pressure between the flanges, compensate for the change in the flange surface spacing caused by temperature changes, and prevent loosening or leakage caused by vibration. It does not rely on external control, but relies on the self-adaptation of the physical properties of the material, and is also distributed in the bolted joints of the entire flange.

[0036] In summary, the present embodiment provides a high temperature corrosion resistant sealing flange, wherein the first flange 100 and the second flange 200 are respectively fixedly connected to two sections of the pipeline, and the connecting surfaces of the first flange 100 and the second flange 200 are opposite to each other. When the first flange 100 and the second flange 200 are tightened by the alloy bolts 300, the outer lip ring 110 of the first flange 100 contacts the outermost annular area 210 of the second flange 200 and squeezes the first sealing ring 230, and then the inner lip ring 120 of the first flange 100 contacts the outermost annular area 210 of the second flange 200. The inner annular area 220 of the flange 200 contacts and squeezes the second sealing ring 240. During the tightening process, the inner lip ring 120 interacts with the sealing gasket 130 at the same time. When under pressure, the sealing gasket 130 can fully embed into the corrugated protrusion 121 of the inner lip ring 120 and deform to form an effective sealing barrier, further enhancing the sealing effect. After the alloy bolt 300 tightens the flange, the spring washer 310 can automatically expand and contract according to the stress of the flange surface, compensate for the size change caused by temperature change, and maintain a constant clamping force at the flange connection. The flange of the utility model realizes efficient sealing in extreme temperature and corrosive environment through a carefully designed structure and the selection of high-quality materials. It is an indispensable key component in the fields of petrochemical, electric power and energy.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A high temperature corrosion resistant sealing flange, characterized in that: The invention comprises a first flange (100) and a second flange (200), wherein the first flange (100) and the second flange (200) are both provided with a pipe opening at their central positions, and the first flange (100) and the second flange (200) are respectively provided with a plurality of mounting holes (1) corresponding to each other in an annular shape; an outer lip ring (110) and an inner lip ring (120) are arranged at intervals on the connecting surface of the first flange (100), and a sealing gasket (130) is sleeved between the outer lip ring (110) and the inner lip ring (120); The connection surface of the second flange (200) is provided with an outermost annular area (210), a sub-outer annular area (250) and an inner annular area (220); the sub-outer annular area (250) is higher than the outermost annular area (210) and the inner annular area (220); the outermost annular area (210) and the inner annular area (220) are grooves; the inner annular area (220) is cooperatively connected to the inner lip ring (120); the outermost annular area (210) is cooperatively connected to the outer lip ring (110); and the sub-outer annular area (250) is cooperatively connected to the sealing gasket (130).

2. The high temperature corrosion resistant sealing flange according to claim 1, characterized in that: The outer surface of the inner lip ring (120) is provided with a wave-shaped protrusion (121), and the inner surface of the sealing gasket (130) is provided with a wave-shaped groove (133) adapted to the wave-shaped protrusion (121).

3. The high temperature corrosion resistant sealing flange according to claim 1, characterized in that: The width of the outer lip ring (110) is greater than the width of the inner lip ring (120), and the width of the outermost annular zone (210) is greater than the width of the inner annular zone (220).

4. The high temperature corrosion resistant sealing flange according to claim 1, characterized in that: The sealing gasket (130) comprises a flexible graphite layer (131) and a metal mesh gasket (132), wherein the metal mesh gasket (132) is embedded in the flexible graphite layer (131).

5. The high temperature corrosion resistant sealing flange according to claim 1, characterized in that: The inner annular area (220) is provided with a first sealing ring (230), and the outermost annular area (210) is provided with a second sealing ring (240).

6. The high temperature corrosion resistant sealing flange according to claim 1, characterized in that: The first flange (100) and the second flange (200) are made of chromium-nickel-iron alloy or Hastelloy.

7. The high temperature corrosion resistant sealing flange according to claim 1, characterized in that: The surfaces of the first flange (100) and the second flange (200) are coated with a ceramic coating.

8. The high temperature corrosion resistant sealing flange according to claim 1, characterized in that: The first flange (100), the sealing gasket (130) and the second flange (200) are connected via alloy bolts (300), and a spring washer (310) is arranged between the bolts and the flange.

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