A reinforced composite sealing gasket flange structure

Abstract

A high-pressure reciprocating combined spring-energy-storing sealing ring structure includes a graphite composite winding section, with its inner and outer surfaces sequentially in interference contact with a shaped metal ring and a metal outer ring; the metal outer ring and a metal frame are in transition fit; a pin-hole circular plate is circumferentially positioned by an interference fit between the two plates; one side of the pin-hole circular plate contacts a pin and a shaped spring, and the other side contacts the graphite composite winding section; rectangular grooves for rubber O-rings are formed on the inner and outer surfaces; the shaped spring and the corresponding pre-drilled holes of the pin-hole circular plate are in interference fit; the trapezoidal raised ring structure of the metal frame and the trapezoidal groove of the flange respectively contact the high-temperature resistant O-ring; the side of the metal outer ring is tightened by a set screw screwed onto the metal frame. This invention effectively adapts to high-temperature and high-pressure environments, has strong vibration stability, uniform contact stress distribution on the gasket-flange contact surface, facilitates alignment, provides better sealing performance, and has a longer service life.

Description

Technical Field

[0001] This invention relates to the field of flange static sealing technology, and in particular to a reinforced composite gasket flange structure. Background Technology

[0002] In the field of flange static sealing technology, graphite spiral wound gaskets are widely used sealing gaskets, capable of withstanding high temperatures and high pressures. However, with increasingly stringent operating conditions, and the severe conditions such as high temperatures and vibrations encountered during the operation of static sealing systems, problems arise such as graphite decomposition, reduced sealing capacity of the graphite spiral wound contact surface, and even complete disintegration. Furthermore, during the installation of graphite gaskets, the centered position of the gasket on the flange is generally determined visually and through experience. Existing gaskets exhibit poor sealing performance under high temperature, high pressure, and vibration conditions, and their installation is cumbersome and unreliable. Summary of the Invention

[0003] To overcome the above problems, the present invention provides a composite gasket flange structure with good stability, excellent sealing performance, effective adjustment of graphite winding degree, and easy centering reinforcement.

[0004] The technical solution adopted in this invention is: an enhanced composite sealing gasket flange structure, including a metal skeleton (1), a set screw (2), a metal outer ring (3), a graphite composite winding part (4), a shaped metal ring (5), a first rubber O-ring (6), a shaped spring (7), a round plate with a pin hole (8), a pin (9), a flange face (10), and a second rubber O-ring (11).

[0005] The metal frame (1) includes an inner metal frame ring (1-4), a middle metal frame ring (1-3), and an outer metal frame ring (1-1) arranged concentrically from the inside to the outside. The outer metal frame ring (1-1) is connected to the middle metal frame ring (1-3) and the inner metal frame ring (1-4) by multiple square columns (1-2).

[0006] The circular plate (8) with pin holes is an annular plate. Multiple sets of holes are spaced circumferentially on the circular plate (8). Each set of holes includes one pin mounting hole and two irregular spring mounting holes. The two irregular spring mounting holes are symmetrically arranged on both sides of the pin mounting hole. Two circular plates (8) with pin holes are symmetrically arranged on the upper and lower sides of the middle ring (1-3) of the metal skeleton. The pin mounting holes on the two circular plates (8) correspond one-to-one and are connected to pins (9). The circular plates (8) with pin holes are circumferentially positioned by an interference fit of pins (9). The irregular spring mounting holes on the two circular plates (8) with pin holes on the plate (8) correspond one-to-one and are connected to irregular springs (7). The irregular springs (7) are interference-fitted with the irregular spring mounting holes. The inner and outer sides of the circular plates (8) with pin holes are provided with rectangular grooves for installing the first rubber O-rings (6). A first rubber O-ring (6) is provided between the circular plates (8) with pin holes and the inner ring (1-4) of the metal skeleton, and between the circular plates (8) with pin holes and the outer ring (1-1) of the metal skeleton. The first rubber O-rings (6) are in interference contact with the metal skeleton (1).

[0007] The graphite composite winding part (4) is a circular graphite winding gasket. Two graphite composite winding parts (4) are respectively set on the upper and lower sides of two circular plates (8) with pin holes along the axial direction. Each graphite composite winding part (4) has a special-shaped metal ring (5) on its inner side along the radial direction. The inner side of the special-shaped metal ring (5) is interference-fitted with the outer side of the inner ring (1-4) of the metal skeleton. Each graphite composite winding part (4) has a metal outer ring (3) on its outer side along the radial direction. The outer side of the metal outer ring (3) is in contact with the inner side of the outer ring (1-1) of the metal skeleton. The graphite composite winding part (4) is in interference contact with the special-shaped metal ring (5) and the metal outer ring (3) respectively.

[0008] The outer ring (1-1) of the metal skeleton is provided with a plurality of set screws (2) spaced circumferentially on its radial outer surface. The outer ring (3) of the metal skeleton is tightened by the set screws (2) screwed onto the metal skeleton (1). The outer ring (1-1) of the metal skeleton is provided with a flange face (10) on each of its upper and lower sides along the axial direction. The outer ring (1-1) of the metal skeleton and the flange face (10) are respectively provided with trapezoidal protrusions and trapezoidal grooves on their surfaces that are close to each other. A second rubber O-ring (11) is provided between the trapezoidal protrusions and the trapezoidal grooves.

[0009] Furthermore, the cross-sectional shape of the irregular metal ring (5) is composed of continuous straight line segments and circular arc segments, and the connection between the straight line segments and the circular arc segments forms a bend.

[0010] Furthermore, the irregular spring (7) is made by rolling a pre-pressed metal sheet; the cross-sectional shape of the pre-pressed part of the metal sheet of the irregular spring (7) is V-shaped, C-shaped, V-shaped, C-shaped or a combination of two or more of the above.

[0011] The beneficial effects of this invention are:

[0012] 1. The trapezoidal raised ring structure, high-temperature resistant O-ring, and flange annular groove configuration on the metal skeleton serve to center the gasket during installation and isolate it from air, significantly reducing the continuous decomposition of graphite in high-temperature, oxygen-rich environments. The calculated dimensional configuration between the trapezoidal raised ring and the flange annular groove provides a secondary metal seal for the entire structure and greatly reduces contact stress weakening under vibration conditions. It also provides auxiliary sealing when the graphite composite winding experiences crushing, vibration, or other seal failures. Furthermore, it prevents damage to the graphite composite from the external environment, improving seal stability.

[0013] 2. Compared with traditional metal spiral wound gaskets, this invention provides a compensating force when the contact surface is subjected to uneven force, making the force distribution on the contact surface tend to be more uniform. When the preload is too high, the metal frame can provide protection for the irregularly shaped spring.

[0014] 3. Under vibration conditions, irregularly shaped springs can provide compensating force and play a buffering role, greatly reducing the impact of vibration on contact stress;

[0015] 4. The irregularly shaped metal ring and the metal skeleton are in line contact, facilitating sliding and providing greater contact force. The angled structure of the irregularly shaped metal ring provides a larger support area for the graphite composite part. The opening of the irregularly shaped metal ring faces the sealing surface, which plays a role in self-tightening under internal pressure, providing greater support force for the graphite composite part.

[0016] 5. The screws and outer ring of the metal skeleton can adjust the winding clamping tightness of the graphite composite winding part, thereby improving the sealing effect. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the present invention;

[0018] Figure 2 This is a symmetrical enlarged cross-sectional schematic diagram of the present invention;

[0019] Figure 3 This is an enlarged structural diagram of part A of the present invention.

[0020] Figure 4 This is a schematic diagram of the gasket explosion of the present invention;

[0021] Figure 5(1-2) is a schematic diagram of the natural state and the compressed state of the irregular spring of the present invention;

[0022] Figure 6 This is a schematic diagram of the metal outer ring of the present invention;

[0023] Figure 7 This is a schematic diagram of the metal skeleton of the present invention.

[0024] Explanation of reference numerals in the attached drawings: 1-Metal skeleton; 2-Set screw; 3-Metal outer ring; 4-Graphite composite winding part; 5-Irregular metal ring; 6-First rubber O-ring; 7-Irregular spring; 8-Circular plate with pin hole; 9-Pin; 10-Flange face; 11-Second rubber O-ring. Detailed Implementation

[0025] The technical solution of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0026] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Referring to the accompanying drawings, an enhanced composite sealing gasket flange structure includes a metal skeleton 1, a set screw 2, a metal outer ring 3, a graphite composite winding part 4, a shaped metal ring 5, a first rubber O-ring 6, a shaped spring 7, a round plate with a pin hole 8, a pin 9, a flange face 10, and a second rubber O-ring 11.

[0029] The metal frame 1 includes an inner metal frame ring 1-4, a middle metal frame ring 1-3, and an outer metal frame ring 1-1 arranged concentrically from the inside to the outside. The outer metal frame ring 1-1 is connected to the middle metal frame ring 1-3 and the inner metal frame ring 1-4 by multiple square columns 1-2.

[0030] The circular plate 8 with pin holes is an annular plate. Multiple sets of holes are spaced circumferentially on the circular plate 8. Each set of holes includes one pin mounting hole and two irregular spring mounting holes, symmetrically arranged on both sides of the pin mounting hole. Two circular plates 8 with pin holes are symmetrically arranged on the upper and lower sides of the intermediate ring 1-3 of the metal frame. The pin mounting holes on the two circular plates 8 correspond one-to-one and are connected to pins 9. The circular plates 8 with pin holes are circumferentially positioned by an interference fit with the pins 9. The irregular spring mounting holes on the two circular plates 8 correspond one-to-one and are connected to irregular springs 7, which are interference-fitted with the irregular spring mounting holes. Under normal circumstances, the intermediate ring 1-3 of the metal frame does not contact the circular plates 8 with pin holes. When the clamping force is too large, it will press against the circular plates 8 to prevent the irregular springs 7 from being crushed.

[0031] One side of the circular plate 8 with pin holes contacts the pin and spring, and the other side contacts the graphite composite winding part. A rectangular groove for placing rubber O-rings is opened on the side. The O-rings make interference contact with the metal frame, and the axial movement of the circular plate with pin holes on the metal frame is realized. Rectangular grooves for installing the first rubber O-rings 6 are opened on both the inner and outer sides of the circular plate 8 with pin holes. A first rubber O-ring 6 is provided between the circular plate 8 with pin holes and the inner ring 1-4 of the metal frame, and between the circular plate 8 with pin holes and the outer ring 1-1 of the metal frame. The first rubber O-rings 6 make interference contact with the metal frame 1.

[0032] The graphite composite winding part 4 is a circular graphite winding gasket. Two graphite composite winding parts 4 are respectively arranged on the upper and lower sides of two circular plates 8 with pin holes along the axial direction. Each graphite composite winding part 4 has a special-shaped metal ring 5 on its inner side along the radial direction. The inner side of the special-shaped metal ring 5 is transitionally fitted with the outer side of the inner ring 1-4 of the metal skeleton. Each graphite composite winding part 4 has a metal outer ring 3 on its outer side along the radial direction. The outer side of the metal outer ring 3 contacts the inner side of the outer ring 1-1 of the metal skeleton. The graphite composite winding part 4 is in interference contact with the special-shaped metal ring 5 and the metal outer ring 3 respectively.

[0033] The outer ring 1-1 of the metal skeleton is provided with a plurality of set screws 2 spaced circumferentially along its radial outer surface. The outer ring 3 of the metal skeleton is tightened by the set screws 2 screwed onto the metal skeleton 1. The outer ring 1-1 of the metal skeleton is provided with a flange face 10 on each of its upper and lower sides along the axial direction. The outer ring 1-1 of the metal skeleton and the flange face 10 are respectively provided with trapezoidal protrusions and trapezoidal grooves on their surfaces that are close to each other. A second rubber O-ring 11 is provided between the trapezoidal protrusion ring structure and the trapezoidal groove when the preload is large enough.

[0034] In addition to structural stability, the inner ring of the metal skeleton (1-4) contacts the irregular metal ring 5, causing the irregular metal ring 5 to deform towards the graphite composite winding part 4 when internal pressure is filled. The irregular metal ring 5 plays a radial self-tightening sealing role and increases the tightness of 4, ensuring sealing stability.

[0035] In some embodiments of the present invention, the cross-sectional shape of the irregular metal ring 5 is composed of continuous straight line segments and circular arc segments, and the connection between the straight line segments and the circular arc segments forms a bend.

[0036] In some embodiments of the present invention, the irregularly shaped spring 7 is formed by rolling a pre-pressed thin metal sheet; the cross-sectional shape of the pre-pressed portion of the metal sheet of the irregularly shaped spring 7 is V-shaped, C-shaped, V-shaped, C-shaped or a combination of two or more of the above. The curved portion of the irregularly shaped spring 7 uses a C-shaped structure, which has better springback ability than a V-shaped structure.

[0037] In some embodiments of the present invention, the rectangular ring in the middle of the metal frame 11 contacts the two circular plates 8 with pin holes when the preload is too large, mainly to prevent the irregular spring 7 from being crushed or losing its elasticity due to excessive clamping force.

[0038] In some embodiments of the present invention, when the preload is sufficiently large, the trapezoidal protruding ring structure of the metal skeleton 1 contacts the trapezoidal groove of the flange 10 and performs a secondary sealing function.

[0039] In some embodiments of the present invention, the winding degree of the graphite composite winding part 4 is adjusted by adjusting the tightness of the set screw 2 on the outer metal ring 3.

[0040] In some embodiments of the present invention, the rubber O-rings 1 and 11 are mainly made of silicone rubber and fluororubber; the metal skeleton 1, the metal outer ring 3, the irregular metal ring 5, the irregular spring 7, and the round plate with pin holes 8 are mainly made of 304, 316, and 316L.

[0041] The specific working principle is as follows: the graphite composite winding part 4 is the main sealing component, the rubber O-ring 11 is the auxiliary sealing component, the trapezoidal annular protrusion of the metal skeleton 1 is the secondary seal, and the remaining parts cooperate to complete the sealing function. During gasket flange installation, the tightening of the set screw 2 applies pressure to the outer metal ring 3 to adjust the tightness of the graphite winding composite part 4. The trapezoidal annular protrusion of the metal skeleton 1 and the trapezoidal groove of the flange 10 achieve radial alignment. After applying bolt preload, the graphite winding composite part 4 and the shaped spring 5 are compressed, and the graphite winding composite part 4 provides the initial sealing effect. After the sealing medium is filled, the shaped metal ring 5 provides greater radial support to the graphite composite winding part 4, improving the sealing performance and stability of the structure. The shaped spring 5 provides the gasket with greater resilience than the graphite winding composite part 4, greatly improving the sealing performance of the gasket when filled with the sealing medium. Under vibration conditions, the irregularly shaped spring 7 acts as a buffer element, providing cushioning force within the gasket structure. This pushes the pin-controlled circular plate 8 and the rubber O-ring to make small axial displacements with the metal skeleton 1, ensuring the stability of the contact stress between the graphite composite winding part 4 and the flange face 10. For uneven circumferential contact stress distribution caused by vibration, the uneven pressure on the circumferentially arranged irregularly shaped springs 7 can also adjust the circumferential contact stress, making it more uniform. During high-temperature operation, the contact between the rubber O-ring 11 and the metal skeleton 1 and flange face 10 provides auxiliary sealing, and isolating oxygen can greatly reduce the decomposition of graphite in the composite winding part 4. When the bolt preload is overloaded or vibration causes the composite winding part 4 to crush or collapse, the trapezoidal protruding ring structure of the metal skeleton 1 contacts the trapezoidal groove of the flange face, providing a secondary seal and acting as the main seal, ensuring continuous and reliable sealing performance. In summary, the reinforced composite sealing gasket flange structure provided by this invention is more suitable for high temperature, high pressure, and vibration conditions. The gasket flange contact surface has a uniform contact stress distribution and is easy to align, resulting in better sealing performance and a longer service life.

[0042] This invention effectively adapts to high temperature and high pressure environments, has strong vibration stability, uniform contact stress distribution on the gasket flange contact surface, facilitates alignment, provides better sealing performance, and has a longer service life.

[0043] The embodiments described in this specification are merely examples of implementations of the inventive concept. The scope of protection of this invention should not be considered as limited to the specific forms stated in the embodiments. The scope of protection of this invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A reinforced composite sealing gasket flange structure, characterized in that: It includes a metal frame (1), a set screw (2), a metal outer ring (3), a graphite composite winding part (4), a shaped metal ring (5), a first rubber O-ring (6), a shaped spring (7), a round plate with a pin hole (8), a pin (9), a flange face (10), and a second rubber O-ring (11). The metal frame (1) includes an inner metal frame ring (1-4), a middle metal frame ring (1-3), and an outer metal frame ring (1-1) arranged concentrically from the inside to the outside. The outer metal frame ring (1-1) is connected to the middle metal frame ring (1-3) and the inner metal frame ring (1-4) by multiple square columns (1-2). The circular plate (8) with pin holes is an annular plate. Multiple sets of holes are spaced circumferentially on the circular plate (8). Each set of holes includes one pin mounting hole and two irregular spring mounting holes. The two irregular spring mounting holes are symmetrically arranged on both sides of the pin mounting hole. Two circular plates (8) with pin holes are symmetrically arranged on the upper and lower sides of the middle ring (1-3) of the metal skeleton. The pin mounting holes on the two circular plates (8) correspond one-to-one and are connected to pins (9). The circular plates (8) with pin holes are circumferentially positioned by an interference fit of pins (9). The irregular spring mounting holes on the two circular plates (8) with pin holes on the plate (8) correspond one-to-one and are connected to irregular springs (7). The irregular springs (7) are interference-fitted with the irregular spring mounting holes. The inner and outer sides of the circular plates (8) with pin holes are provided with rectangular grooves for installing the first rubber O-rings (6). A first rubber O-ring (6) is provided between the circular plates (8) with pin holes and the inner ring (1-4) of the metal skeleton, and between the circular plates (8) with pin holes and the outer ring (1-1) of the metal skeleton. The first rubber O-rings (6) are in interference contact with the metal skeleton (1). The graphite composite winding part (4) is a circular graphite winding gasket. Two graphite composite winding parts (4) are respectively set on the upper and lower sides of two circular plates (8) with pin holes along the axial direction. Each graphite composite winding part (4) has a special-shaped metal ring (5) on its inner side along the radial direction. The inner side of the special-shaped metal ring (5) is interference-fitted with the outer side of the inner ring (1-4) of the metal skeleton. Each graphite composite winding part (4) has a metal outer ring (3) on its outer side along the radial direction. The outer side of the metal outer ring (3) is in contact with the inner side of the outer ring (1-1) of the metal skeleton. The graphite composite winding part (4) is in interference contact with the special-shaped metal ring (5) and the metal outer ring (3) respectively. The outer ring (1-1) of the metal skeleton is provided with a plurality of set screws (2) spaced circumferentially on its radial outer surface. The outer ring (3) of the metal skeleton is tightened by the set screws (2) screwed onto the metal skeleton (1). The outer ring (1-1) of the metal skeleton is provided with a flange face (10) on each of its upper and lower sides along the axial direction. The outer ring (1-1) of the metal skeleton and the flange face (10) are respectively provided with trapezoidal protrusions and trapezoidal grooves on their surfaces that are close to each other. A second rubber O-ring (11) is provided between the trapezoidal protrusions and the trapezoidal grooves.

2. The reinforced composite sealing gasket flange structure as described in claim 1, characterized in that: The cross-sectional shape of the irregular metal ring (5) consists of continuous straight line segments and circular arc segments, with the connection between the straight line segments and the circular arc segments forming a bend.

3. The reinforced composite sealing gasket flange structure as described in claim 1, characterized in that: The irregular spring (7) is made by rolling a pre-pressed metal sheet; the cross-sectional shape of the pre-pressed part of the metal sheet of the irregular spring (7) is V-shaped, C-shaped, C-shaped or a combination of two or more of the above.

Images