An embedded graphite metal micro-gasket structure

Abstract

The invention discloses an embedded graphite metal micro-gasket structure, comprising an annular gasket, a flexible graphite sealing body and two accessory bodies; the annular gasket is located between the two accessory bodies, wherein two annular metal strips are arranged on the upper surface and the lower surface of the annular gasket, wherein the end of the flexible graphite sealing body is inserted between the two annular metal strips, the surfaces of the two accessory bodies are provided with annular grooves, the upper side of the annular gasket is located in the annular groove on one accessory body, and the lower side of the annular gasket is located in the annular groove on the other accessory body, the bottom of the annular groove is provided with an annular sink groove, the ends of the two annular metal strips are inserted into the annular sink groove, the flexible graphite sealing body is directly opposite to the bottom of the annular sink groove, and a set screw is passed through the two accessory bodies and the annular gasket and then sleeved with a nut, and the structure can effectively prevent the graphite from loosening and falling off.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical design and processing, and relates to an embedded graphite metal micro-gasket structure. Background Art

[0002] In the modern industrial field, sealing gaskets are key components of fluid pipeline transportation systems and are often used to seal flanges when connecting pipelines. Their performance is directly related to the safe, stable and efficient operation of the entire system. With the development of related technologies, the fluid media transported by pipeline systems have become diversified, which puts higher requirements on the system technology of pipelines, such as the structure, material, and design of the pipeline body and accessories. Among them, the corrosion resistance of component materials and the system leakage rate are one of the key points.

[0003] When the pipeline sealing gasket is in use, it is tightened between the sealing surfaces by applying force to the sealing structure (such as flange) from the outside, so as to effectively isolate and seal the middle of the gasket from the external space. The inside of the gasket is in direct contact with the fluid medium inside the pipeline, which requires that the physical properties of the gasket material should be suitable for a series of special working conditions such as temperature resistance, corrosion resistance, and fatigue resistance. In addition, since the gasket is often squeezed by the sealing surface and the pressure of the internal medium, and there are radial and axial deformations at the same time, there are higher requirements for the material and structural strength of the gasket.

[0004] As a non-metallic material, graphite has strong plasticity and can be deformed by external force to meet the use requirements. At the same time, graphite also has strong corrosion resistance and high temperature resistance. For most flowing media, graphite is a good sealing material. However, in actual use, graphite as a sealing material is too loose and easy to fall off and disintegrate, especially its reuse effect is even more unsatisfactory. The traditional solution is to use metal ring materials as inner and outer linings to shape the graphite sealing surface and ensure a certain service life. However, this kind of graphite wound gasket also has problems such as easy looseness and inconvenient manufacturing. Especially in situations where small-sized seals are required, traditional metal graphite wound gaskets highlight the shortcomings in manufacturing and use. In addition, when the process has high requirements on the metal material of the gasket, that is, when a more expensive metal material is required as the gasket substrate, the reusable graphite metal gasket type will also have a certain cost saving effect.

[0005] Therefore, a metal graphite sealing gasket that can effectively prevent graphite from loosening and falling off, adapt to small-sized applications, and has the characteristics of repeated use will be able to provide a favorable technical solution to the above-mentioned usage problems. Summary of the invention

[0006] The purpose of the present invention is to overcome the disadvantages of the prior art and provide an embedded graphite metal micro-gasket structure, which can effectively prevent the graphite from loosening and falling off.

[0007] To achieve the above-mentioned purpose, the embedded graphite metal micro-gasket structure of the present invention comprises an annular gasket, a flexible graphite sealing body and two accessory bodies;

[0008] The annular gasket is located between the two accessory bodies, wherein two annular metal strips are arranged on the upper surface and the lower surface of the annular gasket, wherein the end of the flexible graphite sealing body is inserted between the two annular metal strips, and the surfaces of the two accessory bodies are provided with annular grooves, the upper side of the annular gasket is located in the annular groove on one accessory body, and the lower side of the annular gasket is located in the annular groove on the other accessory body, and the bottom of the annular groove is provided with an annular groove, and the ends of the two annular metal strips are inserted into the annular groove, and the flexible graphite sealing body is opposite to the bottom of the annular groove, and the set screw passes through the two accessory bodies and the annular gasket and is sleeved with a nut.

[0009] The cross section of the bottom of the annular sink is an arc-shaped structure.

[0010] Both accessory bodies are provided with a central positioning hole and a fastening hole for the set screw to pass through.

[0011] The hardness of the annular pad is greater than the hardness of the accessory body.

[0012] The end surface of one end of the annular metal stop bar facing the bottom of the annular sink groove is an inclined surface, and the inclined surface faces the flexible graphite sealing body.

[0013] The depth of the annular groove is less than half the thickness of the annular pad.

[0014] The angle between the side wall of the top of the annular trough and the horizontal plane is 45°.

[0015] When in use, the nut is rotated to make the two accessory bodies gradually approach each other and finally contact each other. During this process, the ends of the two annular metal strips contact the inner wall of the annular groove, and as the two accessory bodies gradually approach each other, the annular metal strips are gradually deformed and bent inwardly under the extrusion of the inner wall of the annular groove. At the same time, during the bending process, the two annular metal strips squeeze the flexible graphite sealing body between the two, so that the flexible graphite sealing body gradually approaches the bottom of the annular groove and finally contacts the bottom of the annular groove to achieve internal and external sealing. At the same time, the two annular metal strips are used to limit the flexible graphite sealing body between the two to fix the flexible graphite sealing body.

[0016] The present invention has the following beneficial effects:

[0017] During specific operation of the embedded graphite metal micro-gasket structure described in the present invention, the flexible graphite sealing body is located between the two annular metal strips, and the end of the annular metal strip is directly opposite to the bottom of the annular groove. After the nut is installed, the flexible graphite sealing body is clamped and fixed between the two annular metal strips and the annular groove to prevent the graphite from loosening and falling off, thereby avoiding sealing failure. At the same time, the key sealing body of the gasket presents a multi-layer structure of "hard-soft-hard", which further improves the overall performance of the gasket. On the basis of ensuring the performance of traditional graphite metal sealing gaskets, it is particularly suitable for micro-size application environments, greatly expanding the scope of use of graphite metal sealing gaskets. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1a It is a schematic diagram of the structure of the accessory body 4.

[0019] Figure 1b It is a schematic diagram of the annular metal strip 2 and the flexible graphite sealing body 3 after extrusion;

[0020] Figure 2 is a cross-sectional view of the accessory body 4;

[0021] Figure 3 An exploded view of the present invention;

[0022] Figure 4a is a schematic diagram of the present invention before extrusion;

[0023] Figure 4b It is a schematic diagram of the present invention after extrusion.

[0024] Among them, 1 is an annular gasket, 2 is an annular metal strip, 3 is a flexible graphite seal, 4 is an accessory body, 5 is a center positioning hole, 6 is a fastening hole, 7 is an annular groove, 8 is an annular sink, 9 is an arc structure, 10 is a set screw, and 11 is a nut. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and is not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0026] The accompanying drawings show schematic diagrams of structures according to embodiments disclosed in the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0027] refer to Figures 1a to 4b The embedded graphite metal micro-gasket structure of the present invention comprises an annular gasket 1, two flexible graphite sealing bodies 3 and two accessory bodies 4;

[0028] The annular gasket 1 is located between two accessory bodies 4, wherein two annular metal strips 2 are arranged on the upper surface and the lower surface of the annular gasket 1, wherein the end of the flexible graphite seal 3 is inserted between the two annular metal strips 2, and the surfaces of the two accessory bodies 4 are provided with annular grooves 7, the upper side of the annular gasket 1 is located in the annular groove 7 on one accessory body 4, and the lower side of the annular gasket 1 is located in the annular groove 7 on the other accessory body 4, and an annular groove 8 is arranged at the bottom of the annular groove 7, and the cross-section of the bottom of the annular groove 8 is an arc-shaped structure 9, the ends of the two annular metal strips 2 are inserted into the annular groove 8, and the flexible graphite seal 3 is opposite to the bottom of the annular groove 8, and the set screw 10 passes through the two accessory bodies 4 and the annular gasket 1 and is sleeved with a nut 11. During use, after assembly is completed, rotate the nut 11, and tighten the screw 10 to make the two accessory bodies 4 gradually approach each other and finally contact each other. During this process, the ends of the two annular metal strips 2 contact the inner wall of the annular groove 8, and as the two accessory bodies 4 gradually approach each other, the annular metal strips 2 are gradually deformed and bent inwardly under the extrusion of the inner wall of the annular groove 8. At the same time, during the bending process, the two annular metal strips 2 squeeze the flexible graphite sealing body 3 between the two, so that the flexible graphite sealing body 3 gradually approaches the bottom of the annular groove 8 and finally contacts the bottom of the annular groove 8 to achieve internal and external sealing. At the same time, the two annular metal strips 2 are used to limit the flexible graphite sealing body 3 between the two to fix it.

[0029] The two accessory bodies 4 are both provided with a central positioning hole 5 and a fastening hole 6 for the set screw 10 to pass through.

[0030] When the gasket is manufactured, the size of the accessory body 4 is first determined according to the inner and outer dimensions of the fluid pipeline to be sealed and the size of the sealing surface, and the material of the accessory body 4 and the flexible graphite sealing body 3 is determined according to the fluid characteristics. In addition, the distance between the two annular metal strips 2 needs to be determined according to the sealing pressure resistance level. When the inner and outer pressure difference is greater, the distance between the two annular metal strips 2 is wider. Then, the accessory body 4 is processed by CNC machining, and then the flexible graphite sealing body 3 is obtained by die extrusion, plastic cutting or thermoplastic casting, etc., wherein the two annular metal strips 2 are in contact with the flexible graphite sealing body 3 between them.

[0031] Preferably, the hardness of the annular gasket 1 is greater than the hardness of the accessory body 4 to ensure that the annular metal strip 2 can be bent and formed during extrusion.

[0032] Preferably, the end face of the annular metal strip 2 facing the bottom of the annular groove 8 is an inclined surface, and the inclined surface faces the flexible graphite seal 3, so that during the extrusion process of the flexible graphite seal 3, the damage to the flexible graphite seal 3 is minimized, and after the extrusion is completed, the axis of the inclined surface is perpendicular to the axis of the flexible graphite seal 3, thereby maximally protecting the flexible graphite seal 3 from loosening.

[0033] In actual operation, the width of the flexible graphite seal 3 can be appropriately smaller than the width between the two annular metal strips 2, so that the flexible graphite seal 3 can be prevented from overflowing from the bottom of the annular sink 8 during the secondary processing and extrusion of the gasket.

[0034] The depth of the annular groove 7 is less than half of the thickness of the annular gasket 1, so as to ensure that the annular gasket 1 can be completely pressed and formed during the secondary processing and pressing process, and further ensure the quality of the finished product of the gasket after secondary processing.

[0035] The angle between the side wall at the top of the annular groove 8 and the horizontal plane is 45°, which can ensure that after the accessory body 4 is compressed, the annular metal strip 2 forms a symmetrical wrapped "arch" shape to achieve the strongest structural pressure bearing strength.

[0036] The present invention solves the problem of loosening and falling off of flexible sealing materials in such products through ingenious gasket structure design, strengthens the strength of the gasket seal, and avoids losses caused by gasket sealing failure. At the same time, a step-by-step manufacturing method is also proposed for such gaskets. Not only does it reduce the difficulty of gasket processing and manufacturing, it also solves the problem of gasket reuse, realizes the recycling of related products, and greatly reduces the cost of use. In addition, the present invention can not only efficiently complete the operations of manufacturing, installation, use, maintenance, etc. in practical applications, but also ensures that the gasket has a considerable finished product quality during the initial production and reuse process. The present invention has a reasonable design, ingenious structure, safety and reliability, strong practicality, high efficiency and environmental protection.

Claims

1. An embedded graphite metal micro-gasket structure, characterized in that: It comprises an annular gasket (1), a flexible graphite sealing body (3) and two accessory bodies (4); The annular gasket (1) is located between two accessory bodies (4), wherein two annular metal strips (2) are arranged on the upper surface and the lower surface of the annular gasket (1), wherein the end of the flexible graphite sealing body (3) is inserted between the two annular metal strips (2), and the surfaces of the two accessory bodies (4) are provided with annular grooves (7), the upper side of the annular gasket (1) is located in the annular groove (7) on one accessory body (4), and the lower side of the annular gasket (1) is located in the annular groove (7) on the other accessory body (4), and the bottom of the annular groove (7) is provided with an annular groove (8), the ends of the two annular metal strips (2) are inserted into the annular groove (8), and the flexible graphite sealing body (3) is directly opposite to the bottom of the annular groove (8), and the set screw (10) passes through the two accessory bodies (4) and the annular gasket (1) and is sleeved with a nut (11); The cross section of the bottom of the annular sink (8) is an arc-shaped structure (9); The depth of the annular groove (7) is less than half the thickness of the annular gasket (1); The flexible graphite seal is an annular flexible graphite seal.

2. The embedded graphite metal micro-gasket structure according to claim 1, characterized in that: Both accessory bodies (4) are provided with a central positioning hole (5) and a fastening hole (6) for a set screw (10) to pass through.

3. The embedded graphite metal micro-gasket structure according to claim 1, characterized in that: The hardness of the annular pad (1) is greater than the hardness of the accessory body (4).

4. The embedded graphite metal micro-gasket structure according to claim 1, characterized in that: The end surface of the annular metal strip (2) facing the bottom of the annular sink groove (8) is an inclined surface, and the inclined surface faces the flexible graphite sealing body (3).

5. The embedded graphite metal micro-gasket structure according to claim 1, characterized in that: The angle between the side wall at the top of the annular trough (8) and the horizontal plane is 45°.

6. The embedded graphite metal micro-gasket structure according to claim 1, characterized in that: When in use, the nut (11) is rotated so that the two accessory bodies (4) gradually approach each other and finally contact each other. During this process, the ends of the two annular metal strips (2) contact the inner wall of the annular groove (8). As the two accessory bodies (4) gradually approach each other, the annular metal strips (2) are gradually deformed and bent inwardly under the pressure of the inner wall of the annular groove (8). During the bending process, the two annular metal strips (2) squeeze the flexible graphite sealing body (3) between the two, so that the flexible graphite sealing body (3) gradually approaches the bottom of the annular groove (8) and finally contacts the bottom of the annular groove (8) to achieve internal and external sealing. At the same time, the two annular metal strips (2) limit the flexible graphite sealing body (3) between the two, so that the flexible graphite sealing body (3) is fixed.

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