KR200209203Y1 - Gasket having expansion preventing function - Google Patents

Abstract

The present invention relates to a gasket having an anti-expansion function, comprising a support tube on the inner and outer circumferential surface of the inner gasket having the graphite tape attached to the corrugated metal plate, wrapped the inner gasket and the support tube with a metal jacket and then the graphite tape on the outside of the jacket To prevent expansion of the internal gasket due to the pressure caused by the fastening with the flange, and to maintain a close surface contact force by the restoring force of the expansion preventing means and the corrugated metal plate, thereby improving the sealing force. The limitation of restoration contained in graphite tape or gasket itself, although there is a restoring force to recover some of the deformation caused by pressure or thermal or dynamic change due to the coupling of flange or pipe with conventional gasket. Due to this problem there is a problem that can not prevent the degradation of the surface contact force due to deformation In order to solve one problem, the present invention constitutes an inner gasket having graphite tape having excellent elasticity and resilience on upper and lower portions of corrugated metal plates, and is supported to prevent expansion of the inner gasket by pressure when it is coupled with a flange. A pipe and a metal coating are constituted, and graphite tape is attached to the metal coating.

Description

Gasket having expansion preventing function

The present invention relates to a gasket having an anti-expansion function, comprising a support tube on the inner and outer circumferential surface of the inner gasket having the graphite tape attached to the corrugated metal plate, wrapped the inner gasket and the support tube with a metal jacket and then the graphite tape on the outside of the jacket It is attached to prevent the expansion of the internal gasket due to the lateral pressure due to the fastening with the flange, and by the restoring force of the anti-expansion and corrugated metal plate to maintain a close surface contact force to improve the sealing force.

In general, fluids, such as petrochemical industry, chemical plant, fluid transfer flanges, hydraulic vessels, heat exchangers, pressure pipes, gas main pipes, valve covers, pumps, etc. Gaskets are used to prevent leakage and to prevent foreign substances from entering the inside of the pipe, and these gaskets are used for the shape, inner diameter and diameter of the fluid flowing through the pipe. It is divided into several types according to the type and pressure.

Since the gasket will be used for a long time under sudden temperature change and other operating conditions such as vibration, the gasket should be resistant to deformation due to thermal change and dynamic change due to vibration. It should be ensured that the sealing property between the pipe and the gasket, that is, the fluid or the fluid such as the gas, does not leak into the gap.

The gasket is inserted between the pipe to which the fluid is transferred and the pipe is fastened so that the gasket and the pipe come into close contact with each other by the coupling force when the pipe is fastened so that the fluid does not leak from the joint. do.

When the pipe and the gasket is fastened as described above, the pressure is applied to the gasket by the coupling of the pipe and the gasket is deformed by the pressure, and the degree of deformation varies depending on the material, shape, or structure of the gasket. In the case of long-term use, if the restoring force of the gasket is weak, it cannot respond to the deformation of the pipe or the gasket due to the heat or vibration of the fluid flowing through the pipe and the surface contact force between the pipe and the gasket is lowered and the surface contact force is lowered. The gap (間隙) occurs to leak the fluid flowing through the tube or foreign matter is introduced into the interior of the tube, there is a problem that the need to re-fasten the tube and the gasket or maintenance.

Therefore, the gasket should be configured so that the compressive force and the restoring force are good to maintain the sealing force in order to improve the surface contact force with the tube in its shape and structure.

1 to 3 shows a conventional gasket, FIG. 1 is a perspective view showing the configuration of a flat plate type gasket, and FIG. 2 is a prior application of the applicant of the present application (application number: 20-2000-11920, name: gasket). 3 is an enlarged cross-sectional view showing a main part of the gasket, and FIG. 3 is an enlarged cross-sectional view showing a main part of a conventional gasket interposed on a flange.

1 to 3, the graphite tape 22 is attached to the flat plate gasket 12 or the flat plate gasket interposed between the flange 10 and the flange 10 to prevent the leakage of fluid flowing through the pipe. Graphite-attached gaskets 24 are provided, and the gaskets 12 and 24 are tightened by bolts 14 and nuts 16 formed at regular intervals on the circumference of the flange 10, The flange 10 and the gaskets 12 and 24 are in intimate surface contact and serve as a sealing function.

A portion of the graphite attachment gasket 24 to which the graphite tape 22 is attached is formed in a flat plate shape or in a wave form (not shown) so that the surface contact force is improved by the restoring force of the wave shape.

In the conventional gasket, when the valve is first mounted on the flange, the bolt and nut are tightly fastened so that there is no problem in sealing property to prevent leakage of the fluid flowing through the pipe. There is a problem of leakage, and repeated maintenance is required to prevent such leakage.

In other words, when the flange and the gasket undergoes a thermal change according to the temperature change of the fluid flowing through the pipe, thermal deformation occurs and the surface contact force of the surface where the flange and the gasket contact each other decreases, and the high pressure fluid may leak. In the case where the initial engagement cannot be maintained due to the dynamic change of the tube, a gap occurs in the surface contact between the flange or the tube and the gasket, and this also causes a problem that the fluid flowing through the tube leaks.

The gasket does not respond quickly to these thermal or dynamic changes because of its low resilience.

In order to solve the problem of low restoring force, the gasket may be attached to a member having excellent elastic force such as graphite to solve the problem of restoring force, or the gasket itself may be made into a waveform to prevent surface contact force from deteriorating due to the restoring force of the waveform.

In the case of using the gasket according to the above-described configuration, although there is a restoring force to which the deformation due to the pressure by the coupling with the flange or the pipe, the deformation due to the thermal or dynamic change is recovered to some extent, the graphite tape or the gasket itself There is a problem that cannot prevent the reduction of the surface contact force due to deformation due to the limitation of the restoration contained.

In addition, when the pipe and the gasket are combined, the outer circumferential surface of the gasket may be caught in the thread of the bolt. At this time, if the bolt is rotated to closely connect the pipe and the tube, the outer circumferential surface of the thread may be damaged or the entire gasket may be stuck. Cracking occurs in the sealant, which may cause a problem in that the sealing property is degraded.

In order to solve the above problems, the present invention constitutes an inner gasket having graphite tape having excellent elasticity and restoring force on the upper and lower portions of the corrugated metal plate, and prevents the inner gasket from being inflated by the pressure when it is combined with the flange. By constructing a support tube and a metal coating, and reattaching the graphite coating on the metal coating, the problem of the conventional gasket with weak restoring force is solved, and a cover is attached to the outer circumferential surface of the gasket so that the outer circumferential surface of the gasket is not caught by the thread of the bolt. There is a technical challenge to this.

1 is a perspective view showing the configuration of a flat plate type gasket.

Figure 2 is an enlarged cross-sectional view showing the main portion of the gasket presented by the applicant (Application No .: 20-2000-11920, name: gasket) of the applicant of the present application.

Figure 3 is an enlarged sectional view of the main portion showing a state in which a conventional gasket is interposed on the flange.

Figure 4 is a perspective view showing the configuration of the gasket according to the present invention.

Figure 5a is an enlarged cross-sectional view of the main portion showing the configuration of the gasket according to the present invention.

Figure 5b is an enlarged cross-sectional view of the main portion with the cover attached to the outer ring of the gasket according to the present invention.

Figure 5c is an enlarged cross-sectional view of the main portion to which the other cover is attached to the outer ring of the gasket according to the present invention.

Figure 6a is an enlarged cross-sectional view showing the main portion showing the configuration of another embodiment of the gasket according to the present invention.

Figure 6b is an enlarged sectional view of the main portion showing the configuration of another embodiment of the gasket according to the present invention.

Figure 7 is an enlarged sectional view of the main portion showing a state in which the gasket according to the present invention is in close contact between the flange and the flange.

※ Explanation of code about main part of drawing ※

10, 50: flange 12: flat gasket

14, 52: bolt 16, 54: nut

22, 34, 34a: graphite tape 24: gasket with graphite

32: corrugated metal plate 36, 36a, 36b: support tube

38: inner metal coating 40: outer metal coating

42: outer ring 44: gasket

46: outer ring cover 48: space

The technical problem of the present invention is a support tube for forming an inner gasket having a flexible graphite tape having excellent elasticity and restoring force above and below the corrugated metal plate, and contacting the end of the corrugated metal plate formed on the inner and outer circumferential surfaces of the inner gasket. In order to prevent the expansion of the corrugated metal plate inward and outward due to the pressure applied when the gasket of the present invention is coupled to the flange, the jacket type having a rectangular shape with an open lower side surrounding the inner gasket and the support tube A jacket type outer metal coating having a rectangular shape having an inner metal coating and an upper side of which is open, and a outer ring of a plate type is formed on the outer circumferential surface of the outer metal coating so as to be in contact with a bolt coupling a flange. It can be done by attaching soft graphite tape to the inner and outer metal coatings, The technical task of the present invention can be made by adding a cover to the outer peripheral surface of the outer ring to abut.

Hereinafter, with reference to the accompanying drawings a gasket having a function of preventing expansion according to the present invention will be described in detail.

Figure 4 is a perspective view showing the configuration of the gasket according to the present invention, Figure 5a is an enlarged cross-sectional view of the main portion showing the configuration of the gasket according to the present invention, Figures 5b and 5c is a cover attached to the outer ring of the gasket according to the present invention 7 is an enlarged cross-sectional view of the main part of the gasket, and FIG. 7 is an enlarged cross-sectional view of the main part showing a state where the gasket according to the present invention is tightly fixed between the flange and the flange.

Referring to the drawings, an inner gasket having graphite tape 34 having excellent compression and restoring force is attached to upper and lower portions of the corrugated metal plate 32 having a waveform formed at a predetermined portion, and the corrugated metal plate 32 is made of a metal having strong elasticity. It is preferable to be manufactured.

The inner and outer circumferential surfaces of the corrugated metal plate 32 to which the graphite tape 34 is attached constitute a ring-shaped support tube 36 having a ball formed at the center thereof, and the graphite tape 34 to which the graphite tape 34 is attached. In order to surround the corrugated metal plate 32 and the support tube 36, a jacket type inner metal coating 38 having a rectangular shape with an open lower side is formed, and the open lower side of the inner metal coating 38 is formed. By supporting the outer side of the jacket-type outer metal coating 40 of the open side to prevent the corrugated metal plate 32 of the inner gasket from expanding left and right by the pressure applied up and down.

After the configuration as described above, the outer surface of the outer surface of the outer metal coating 40 is formed of a metallic outer ring 42 of the flat type can be in contact with the outer circumferential surface of the bolt 52 as a coupling means when engaged with the flange 50 In order to ensure that the gasket 44 according to the present invention can be fixed so as not to move when combined with the flange (50). When the flange 50 and the gasket 44 are coupled or dismantled, an outer ring cover 46 having a thickness greater than the threaded pitch of the bolt is added to the outer circumferential surface of the outer ring 42 which is in contact with the outer circumferential surface of the bolt 52. Even if the bolt rotates, the outer ring cover 46 is not caught between the threads of the bolt, so that no damage or crack occurs in the outer ring 42 or the gasket 44 of the gasket, and the outer ring cover 46 is fixed to the bolt. In order to prevent contact with 52 too strongly, a structure for forming the space 48 in the outer ring cover 46 is added.

In the above configuration, the graphite tape 34a having a high elasticity is attached to the upper end of the outer metal coating 40 and the lower end of the inner metal coating 38, so that the surface contact with the flange can be made more intimately. .

The state in which the gasket of the present invention configured as described above is interposed between the flange and the flange will be described.

First, the flange 50 and the flange 50 are coupled and fixed by using the bolt 52 and the nut 54 while the gasket 44 is positioned between the flange 50 and the flange 50. At this time, the outer ring 32 or the outer ring cover 46 is in contact with the outer circumferential surface of the bolt 52, the upper end of the outer metal coating 40, that is, fixed in close contact with the lower end of the inner metal coating 38 The graphite tape 34a is in close contact with the contact surface with the flange 50.

When the gasket 44 is positioned between the flange 50 and the flange 50 in this manner, the flange 50 and the flange 50 are fixed by using the bolt 52 and the nut 54. As the 52 and the nut 54 are fastened, the gasket 40 is compressed in the vertical direction by the coupling force and the load of the flange 50. At this time, the corrugated metal plate 32 is extended in and out and the cylindrical support tube 36 is compressed in an oval shape. The support tube 36 compressed in an ellipse supports the corrugated metal tube 32 in one direction and the other side. Since the inner and outer metal coatings 38 and 40 are in contact with each other in the direction, the inner and outer metal coatings 38 and 40 prevent the support tube 36 from being pushed from side to side and the support tube 36 has a corrugated metal plate ( 32) prevents further extension and thus repels the compressive force of the flange 50, so that the compressive force in the vertical direction due to the coupling force of the bolt 52 and the nut 54 and the self-load of the flange 50 and the coupling force and the compressive force Graphite tape 32a and flanges attached to the outside of the inner and outer metal coatings 38 and 40 by the self-resilience of the corrugated metal plate 32, the support tube 36, and the inner and outer metal coatings 38 and 40, (50) comes into intimate surface contact and leakage of fluid such as liquid or gas flowing through the tube It would be prevented.

Due to the self restoring force of the gasket 44, even in the flow of the flange 50 and the flange 50 due to the thermal change and vibration of the fluid, the sealing property due to the surface contact does not deteriorate and thus the airtightness is completely sealed. Can be.

Referring to Figure 6 showing another embodiment of the present invention, Figure 6a is an enlarged cross-sectional view of the main portion showing the configuration of another embodiment of the gasket according to the present invention flange 50 when the flange 50 and the gasket 44 is coupled And the gasket 44 has only a support tube 36a formed on the inner circumferential surface of the gasket 44 and removes the support tube provided on the outer circumferential surface when the coupling surface of the gasket 44 is small. The overall width is reduced by the width of the support pipe is removed, so that it can be mounted on a small flange, Figure 6b is an enlarged cross-sectional view showing the configuration of another embodiment of the gasket according to the present invention inside and outside the gasket 44 The support tube 36, which was provided on the main surface, constitutes the support tube 36b at the center of the inner and outer metal coatings 38 and 40, and the corrugated metal plate 32 is formed on both sides of the support tube 36b to form a flange ( Central part of the gasket 44 in engagement with 50) Up to having a means for preventing the metal plate that is wave 32 it is provided on the expansion side.

As described above, by forming a support tube and an inner and outer metal coating to prevent the corrugated metal plate from expanding, the surface contact force of the gasket and the flange can be improved to achieve a perfect sealing, thereby improving the sealing property, and the corrugated metal plate, the support tube, and the like. Due to the self-resilience of the inner and outer metal sheaths, the surface contact force does not deteriorate in any situation due to the rapid change in the gap between the flange and the gasket due to the thermal change of the fluid flowing through the pipe and the fluctuation of the flange due to the vibration. There is no effect on the ringability. In addition, the surface contact force does not decrease even if the gasket is used for a long time, which reduces the time, manpower, and cost required for maintenance, and adds a cover to the outer ring of the gasket. Since the outer ring is not caught, there is an effect that the gasket is not damaged or cracked.

Claims (5)

A gasket for preventing leakage of fluid flowing through a pipe by interposing a connecting pipe, comprising an inner gasket having graphite tapes 34 attached to the upper and lower parts of the corrugated metal plate 32, the corrugated metal plate being formed on the inner and outer circumferential surfaces of the inner gasket. A rectangular inner metal coating 38 having an open lower side surrounding the inner gasket and the support tube 36 and a rectangular outer outer metal covering having an upper side configured to constitute a support tube 36 for contacting an end thereof. (40), the outer circumferential surface of the outer metal coating constitutes a flat outer ring (42), and graphite tape (34a) is attached to the inner and outer metal coating (38, 40), characterized in that the Gasket with anti-expansion function. The gasket having an anti-expansion function according to claim 1, characterized in that an outer ring cover (46) is formed on the outer circumferential surface of the outer ring (42) wider than the thread pitch of the bolt. 3. The gasket according to claim 2, wherein a space portion (48) is formed inside the outer ring cover (46). 2. The expansion preventing function according to claim 1, wherein the gasket is formed of only the support tube 36a close to the inner circumferential surface of the gasket by removing the support tube close to the outer circumferential surface of the gasket in configuring the support tube 36. Having gasket. The gasket having an expansion preventing function according to claim 1, wherein the supporting pipe (36) is formed by forming a supporting pipe (36b) at a central portion of the gasket.