CN113464650A

CN113464650A - Embedded graphite metal micro gasket structure

Info

Publication number: CN113464650A
Application number: CN202110872655.8A
Authority: CN
Inventors: 李明皓; 王晓冰; 白永岗; 鲁晓宇; 董陈; 周科
Original assignee: Xian Thermal Power Research Institute Co Ltd
Current assignee: Xian Thermal Power Research Institute Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-10-01
Anticipated expiration: 2041-07-30
Also published as: CN113464650B

Abstract

The invention discloses an embedded graphite metal micro-gasket structure, comprising a ring-shaped backing plate, a flexible graphite sealing body and two accessory bodies; the ring-shaped backing plate is located between the two accessory bodies, wherein the upper surface of the ring-shaped backing plate and the Two annular metal rails are arranged on the lower surface, wherein the end of the flexible graphite sealing body is inserted between the two annular metal rails, the surfaces of the two accessory bodies are provided with annular grooves, and the annular backing plate is provided with an annular groove. The upper side is located in the annular groove on one accessory body, the lower side of the annular backing plate is located in the annular groove on the other accessory body, the bottom of the annular groove is provided with an annular sink groove, and two annular metal rails The end of the screw is inserted into the annular sink, the flexible graphite sealing body is facing the bottom of the annular sink, and the set screw is sleeved with a nut after passing through the two accessory bodies and the annular backing plate. This structure can effectively prevent Graphite loosely falls off.

Description

Embedded graphite metal micro gasket structure

Technical Field

The invention belongs to the technical field of mechanical design and processing, and relates to an embedded graphite metal micro gasket structure.

Background

In the modern industrial field, a sealing gasket is used as a key part of a fluid pipeline conveying system and is commonly used for sealing flanges during pipeline connection, and the quality of the service performance of the sealing gasket is directly related to the safe, stable and efficient operation of the whole system. With the development of the related art, fluid media transported by using a pipeline system are diversified, which puts higher requirements on the pipeline system technology, such as the structure, material, design and the like of a pipeline main body and accessories. Among them, corrosion resistance of the material of the component and leakage rate of the system are important.

When the pipeline sealing gasket is used, acting force applied to a sealing structure (such as a flange) from the outside is tightly fixed between sealing surfaces, and effective isolation and sealing of the middle part of the gasket and the external space are realized. The interior of the gasket is in direct contact with a fluid medium in the pipeline, so that the physical property of the gasket material is required to be suitable for a series of special condition working conditions such as temperature resistance, corrosion resistance, fatigue resistance and the like. In addition, the gasket is often subjected to the extrusion of the sealing surface and the pressure of an internal medium, and has radial and axial deformation, so that the gasket has high requirements on the material and structural strength.

Graphite is used as a non-metallic material, has strong plasticity, and can deform the graphite material by external force so as to meet the use requirement. Meanwhile, the graphite also has strong corrosion resistance and high temperature resistance. Graphite is a good sealing material for most flowing media. However, in the practical use process, the graphite as the sealing material is too loose and is easy to fall off and disintegrate, and especially the effect of the repeated use of the graphite is not ideal. The traditional solution is to use metal ring material as inner and outer linings to shape the graphite sealing surface and ensure a certain service life. However, the graphite wound gasket is easy to loosen and inconvenient to manufacture. Especially where a seal of very small dimensions is required, conventional metal graphite wound gaskets are particularly prone to manufacturing and use deficiencies. In addition, when the technological process has high requirements on the metal material of the gasket, namely the expensive metal material is needed to be used as the gasket base material, the reusable graphite metal gasket type also has certain cost saving effect.

Therefore, the metal graphite sealing gasket which can effectively prevent graphite from loosening and falling, is suitable for small-size application occasions and has the repeated use characteristic can provide a favorable technical solution aiming at the use problem.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned disadvantages of the prior art and providing an embedded graphite metal micro-spacer structure that can effectively prevent graphite from loosening and falling off.

In order to achieve the purpose, the embedded graphite metal micro gasket structure comprises an annular base plate, a flexible graphite sealing body and two accessory bodies;

the annular backing plate is located between two annex bodies, wherein, all is provided with two annular metal shelves strips on the upper surface of annular backing plate and the lower surface, and wherein, the tip of flexible graphite seal inserts between two annular metal shelves strips, and the surface of two annex bodies all is provided with the annular groove, and the upside of annular backing plate is located the annular groove on an annex body, and the downside of annular backing plate is located the annular groove on another annex body, the bottom of annular groove is provided with the annular heavy groove, the tip of two annular metal shelves insert in the annular heavy inslot, flexible graphite seal is just right the bottom in annular heavy groove, the nut has been cup jointed after holding screw passed two annex bodies and annular backing plate.

The cross section of the bottom of the annular sinking groove is of a circular arc structure.

The two accessory bodies are respectively provided with a central positioning hole and a fastening hole for a fastening screw to pass through.

The hardness of the annular backing plate is greater than that of the accessory body.

The end face of one end, opposite to the bottom of the annular sinking groove, of the annular metal barrier strip is an inclined face, and the inclined face faces the flexible graphite sealing body.

The depth of the annular groove is less than half of the thickness of the annular backing plate.

The included angle between the side wall at the top of the annular sinking groove and the horizontal plane is 45 degrees.

When using, the nut is rotated, make two annex bodies draw close gradually, and finally contact, in this process, the tip of two annular metal shelves strip contacts with the inner wall that the annular sinks the groove, and draw close along with gradually of two annex bodies, annular metal shelves strip is out of shape under the extrusion of annular heavy inslot wall gradually, and incurving, simultaneously in bending process, extrude the flexible graphite seal between the two through two annular metal shelves strips, make the flexible graphite seal draw close gradually to the bottom that the annular sinks the groove, and finally contact with the bottom that the annular sinks the groove mutually, in order to realize inside and outside seal, carry on spacingly through two annular metal shelves strips to the flexible graphite seal between the two simultaneously, make the flexible graphite seal fixed.

The invention has the following beneficial effects:

when the embedded graphite metal micro gasket structure is specifically operated, the flexible graphite sealing body is positioned between the two annular metal baffle strips, the end parts of the annular metal baffle strips are opposite to the bottom of the annular sinking groove, and after the nut is installed, the flexible graphite sealing body is clamped and fixed between the two annular metal baffle strips and the annular sinking groove to prevent graphite from loosening and falling off and avoid the situation of sealing failure.

Drawings

Fig. 1a is a schematic structural view of the attachment body 4.

FIG. 1b is a schematic view of the annular metal barrier 2 and the flexible graphite sealing body 3 after extrusion;

FIG. 2 is a cross-sectional view of the attachment body 4;

FIG. 3 is an exploded view of the present invention;

FIG. 4a is a schematic representation of the present invention prior to extrusion;

figure 4b is a schematic representation of the invention after extrusion.

Wherein, 1 is an annular backing plate, 2 is an annular metal stop strip, 3 is a flexible graphite sealing body, 4 is an accessory body, 5 is a central positioning hole, 6 is a fastening hole, 7 is an annular groove, 8 is an annular sinking groove, 9 is an arc-shaped structure, 10 is a set screw and 11 is a nut.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

Referring to fig. 1a to 4b, the embedded graphite metal micro gasket structure of the present invention includes an annular shim plate 1, two flexible graphite sealing bodies 3, and two accessory bodies 4;

the annular base plate 1 is positioned between the two accessory bodies 4, wherein the upper surface and the lower surface of the annular base plate 1 are both provided with two annular metal stop bars 2, wherein the end part of the flexible graphite sealing body 3 is inserted between the two annular metal baffle strips 2, the surfaces of the two accessory bodies 4 are both provided with an annular groove 7, the upper side of the annular backing plate 1 is positioned in the annular groove 7 on one accessory body 4, the lower side of the annular backing plate 1 is positioned in the annular groove 7 on the other accessory body 4, the bottom of the annular groove 7 is provided with an annular sunken groove 8, the cross section of the bottom of the annular sunken groove 8 is of a circular arc structure 9, the end parts of two annular metal barrier strips 2 are inserted into the annular sunken groove 8, the flexible graphite sealing body 3 is right opposite to the bottom of the annular sunken groove 8, and a set screw 10 penetrates through the two accessory bodies 4 and the annular base plate 1 and then is sleeved with a nut 11. When in use, after the assembly is completed, the nut 11 is rotated, the two accessory bodies 4 are gradually drawn close through the fastening screw 10 and finally contacted, in the process, the end parts of the two annular metal baffle strips 2 are contacted with the inner wall of the annular sinking groove 8 and gradually drawn close along with the two accessory bodies 4, the annular metal baffle strips 2 are gradually deformed under the extrusion of the inner wall of the annular sinking groove 8 and are bent inwards, and meanwhile, in the bending process, the flexible graphite sealing body 3 between the two annular metal baffle strips 2 is extruded through the two annular metal baffle strips 2, so that the flexible graphite sealing body 3 is gradually drawn close to the bottom of the annular sinking groove 8 and finally contacted with the bottom of the annular sinking groove 8, so that the inside and outside sealing is realized, and meanwhile, the flexible graphite sealing body 3 between the two annular metal baffle strips 2 is limited and is fixed.

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

When the gasket is manufactured, the size of the accessory body 4 is determined according to the inner and outer sizes of a fluid pipeline to be sealed and the size of a sealing surface, and meanwhile, the materials of the accessory body 4 and the flexible graphite sealing body 3 are determined according to the fluid characteristics. In addition, the distance between the two annular metal baffle strips 2 is determined according to the sealing pressure-resistant grade, when the difference between the internal pressure and the external pressure is larger, the distance between the two annular metal baffle strips 2 is wider, then the accessory body 4 is processed by adopting a numerical control machine processing mode, and then the flexible graphite sealing body 3 is obtained by adopting methods such as die extrusion, plastic cutting or thermoplastic casting, wherein the two annular metal baffle strips 2 are in contact with the flexible graphite sealing body 3 between the two annular metal baffle strips.

Preferably, the hardness of the annular shim plate 1 is greater than that of the attachment body 4 to ensure that the annular metal stop strip 2 can be bent during extrusion.

Preferably, the end face of the annular metal stop bar 2, which faces the end of the bottom of the annular sinking groove 8, is an inclined face facing the flexible graphite sealing body 3, so that in the process of extruding the flexible graphite sealing body 3, the damage to the flexible graphite sealing body 3 is reduced as much as possible, and after the extrusion is completed, the axis of the inclined face is perpendicular to the axis of the flexible graphite sealing body 3, and the flexible graphite sealing body 3 is protected from loosening.

In actual operation, the width of the flexible graphite sealing body 3 can be properly smaller than the width between the two annular metal stop bars 2, and in the gasket secondary processing and extrusion process, the flexible graphite sealing body 3 is prevented from overflowing the bottom of the annular sinking groove 8.

The depth of the annular groove 7 is less than half of the thickness of the annular base plate 1, so that the annular base plate 1 can be completely compressed and molded in the secondary processing compression process, and the quality of a finished product of the secondary processing of the gasket is further ensured.

The included angle between the side wall at the top of the annular sinking groove 8 and the horizontal plane is 45 degrees, so that after the accessory body 4 is tightly pressed, the annular metal baffle strips 2 form a symmetrical wrapped arch shape, and the strongest structural bearing strength is achieved.

The invention solves the problem that the flexible sealing material in the product is easy to loosen and fall off through the ingenious gasket structure design, strengthens the strength of the gasket sealing body and avoids the loss caused by the sealing failure of the gasket. Meanwhile, a manufacturing method of step processing is provided for the gasket. The difficulty of gasket processing and manufacturing is reduced, the problem of recycling of the gasket is solved, recycling of related products is achieved, and the use cost is greatly reduced. In addition, the invention not only can efficiently finish the operations of manufacture, installation, use, maintenance and the like in practical application, but also ensures that the gasket has equivalent finished product quality in the processes of primary production and recycling. The invention has the advantages of reasonable design, ingenious structure, safety, reliability, strong practicability, high efficiency and environmental protection.

Claims

1. An embedded graphite metal tiny gasket structure is characterized in that, comprising annular backing plate (1), flexible graphite sealing body (3) and two accessory bodies (4);

The annular backing plate (1) is located between the two accessory bodies (4), wherein the upper surface and the lower surface of the annular backing plate (1) are provided with two annular metal rails (2), wherein the flexible graphite seal The ends of the body (3) are inserted between the two annular metal bars (2), the surfaces of the two accessory bodies (4) are provided with annular grooves (7), and the upper side of the annular backing plate (1) is located at In the annular groove (7) on one accessory body (4), the lower side of the annular backing plate (1) is located in the annular groove (7) on the other accessory body (4), the annular groove (7) ) is provided with an annular sink groove (8) at the bottom, the ends of the two annular metal rails (2) are inserted into the annular sink groove (8), and the flexible graphite sealing body (3) is facing the annular sink groove At the bottom of (8), a nut (11) is sleeved after the set screw (10) passes through the two accessory bodies (4) and the annular backing plate (1).

2 . The embedded graphite metal micro-gasket structure according to claim 1 , wherein the cross section of the bottom of the annular sink groove ( 8 ) is a circular arc structure ( 9 ). 3 .

3. The embedded graphite metal tiny gasket structure according to claim 1, wherein the two attachment bodies (4) are provided with central positioning holes (5) for the set screws (10) to pass through. and fastening holes (6).

4 . The embedded graphite metal micro-gasket structure according to claim 1 , wherein the hardness of the annular backing plate ( 1 ) is greater than that of the accessory body ( 4 ). 5 .

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

6. The embedded graphite metal micro-gasket structure according to claim 1, wherein the depth of the annular groove (7) is less than half of the thickness of the annular backing plate (1).

7 . The embedded graphite metal micro-gasket structure according to claim 1 , wherein the angle between the side wall of the top of the annular sink groove ( 8 ) and the horizontal plane is 45°. 8 .

8. 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) are gradually approached and finally come into contact, here During the process, the ends of the two annular metal rails (2) are in contact with the inner wall of the annular sink groove (8), and as the two attachment bodies (4) gradually move closer together, the annular metal rails (2) are in the ring. The inner wall of the sink groove (8) is gradually deformed under the extrusion, and is bent inward. At the same time, during the bending process, the flexible graphite sealing body (3) between the two annular metal bars (2) is squeezed, so that the flexible graphite sealing body (3) between them is squeezed. The flexible graphite sealing body (3) gradually approaches the bottom of the annular sink groove (8), and finally comes into contact with the bottom of the annular sink groove (8) to achieve internal and external sealing. The flexible graphite sealing body (3) between the two is limited, so that the flexible graphite sealing body (3) is fixed.