WO2021162223A1

WO2021162223A1 - Gasket

Info

Publication number: WO2021162223A1
Application number: PCT/KR2020/017860
Authority: WO
Inventors: 이정석; 이종철
Original assignee: 주식회사 국일인토트; 이정석
Priority date: 2020-02-10
Filing date: 2020-12-08
Publication date: 2021-08-19
Also published as: KR20220132498A; KR20220027093A; KR102564321B1; KR20210001881U

Abstract

The present invention relates to a gasket which is excellent at covering flange variations, the gasket comprising: a first soft sealing material and a second soft sealing material, which are provided on the top surface and the bottom surface of metal cladding, respectively, and are made of materials having excellent elasticity and resilience; two layers of metal cladding provided in a ring shape and forming the outer circumferential surface of the gasket; a pair of coil springs provided inside the metal cladding; and an embedded ring provided between the coil springs.

Description

gasket

The present invention relates to a gasket, and more particularly, to a gasket having an excellent flange deviation cover.

In general, a gasket is inserted between two pipes to be connected to prevent fluid leakage through a gap between the pipes. In addition to preventing leakage, it has a sealing function to prevent foreign substances from flowing into the inside of the tube body.

That is, when the flange of the valve or pipe is fastened, the volume of the gasket is compressed by the pressure applied in the axial direction, and the joint between the flanges, which is a connection part, is blocked from the outside.

However, gaskets that are actually installed and used in a plant respond to various environments and conditions and must maintain a sealed state.

For example, the size and location of the flange on which the gasket is mounted, the bolting process for fastening, etc. must be considered. In particular, since the operating conditions of the plant are continuous heating and cooling, high temperature inside the pipes P1 and P2 If the high-pressure fluid flows repeatedly, it becomes difficult to perfectly horizontally maintain the flatness of the flanges F1 and F2, which are the connecting parts of the pipe bodies P1 and P2, so that the distance between the flanges F1 and F2 is shown in FIG. As shown in Fig. 2, the gap is biased (D2>D1).

At this time, the gasket mounted between the first flange F1 and the second flange F2 must overcome this deviation and maintain the sealing state.

According to the conventional gasket, when the gasket is first mounted on the flange, it is hermetically fastened by bolts and nuts, so there is no problem in sealing performance to prevent leakage of fluid flowing in the pipe. There is a problem that can occur, and repeated maintenance is required to prevent such leakage.

That is, when the flange and the gasket undergo 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 in contact with the flange and the gasket is lowered, and the high-pressure fluid may leak. When the initial coupling state cannot be maintained due to the dynamic change due to the vibration of the pipe, a gap is generated in the surface contact between the flange or the pipe and the gasket, which also has a problem in that the fluid flowing through the pipe leaks.

The reason why the gasket does not respond quickly to these thermal or dynamic changes is that if the restoring force the gasket retains on its own is low, the restoring forces on both sides act similarly.

In order to solve this problem, in the present invention, a gasket provided with a soft sealing material with excellent elasticity and restoring force on the upper and lower surfaces of the metal clad, respectively, and a metal clad, core spring, etc. I would like to suggest

In order to solve the above problem, the gasket of the present invention is provided in a ring shape with a first soft sealing material and a second soft sealing material of a material having excellent elasticity and restoring force, respectively, on the upper and lower surfaces of the metal clad to form the outer circumferential surface of the gasket. It includes a metal clad layer, a coil spring provided as a pair inside the metal clad, and a built-in ring provided between the coil springs.

According to the present invention, the surface contact force between the gasket and the flange is improved to achieve perfect sealing, thereby improving sealing properties.

In addition, there is an effect of providing a gasket having no change in sealability because the surface contact force does not decrease even when the flange fluctuates or the gap between the flange and the gasket is changed due to thermal or dynamic change.

In addition, there is an effect that can prevent the gasket from being separated from between the flange and the flange.

In addition, by improving the lifespan of the gasket, there is an effect of reducing the time, manpower, and cost required for maintenance without lowering the surface contact force even when the gasket is used for a long period of time.

1 is a perspective view of a gasket according to an embodiment of the present invention.

2 is a cross-sectional view of a gasket according to a first embodiment of the present invention.

3 is a cross-sectional view of a gasket according to a second embodiment of the present invention.

4 is a cross-sectional view of a gasket according to a third embodiment of the present invention.

5 is a cross-sectional view of a gasket according to a fourth embodiment of the present invention.

6 is a cross-sectional view of a gasket according to a fifth embodiment of the present invention.

7 is a cross-sectional view of a gasket according to a sixth embodiment of the present invention.

8 is a view showing a state in which a deviation occurs in the spacing between the flanges.

A gasket mounted between a first flange and a second flange to prevent fluid leakage, the gasket comprising: a metal clad provided in a ring shape to form an outer circumferential surface of the gasket; A first soft sealing material provided in contact with the upper surface of the metal clad and provided in the shape of a disc with an open inner side, and a second soft sealing material provided in contact with the lower surface of the metal clad in the shape of a disc with an open inner side. gasket made with

Hereinafter, a preferred embodiment of a gasket according to the present invention will be described with reference to the accompanying drawings. Here, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary depending on the intention of a user or operator. Therefore, the scope of rights should not be limited by these terms, and it should be decided on an overall basis. In these drawings and descriptions, the gasket is described in a circular ring shape, but the overall shape of the gasket is not limited thereto, and may be formed in various shapes such as an oval, a square, a rhombus, etc. according to the shape of a pipe or a flange and if necessary.

Hereinafter, a gasket according to an embodiment of the present invention will be described with reference to FIG. 1 . 1 is a perspective view of a gasket according to an embodiment of the present invention.

Referring to FIG. 1 , the gasket 1 of the present invention is provided in a ring shape to form a metal clad 20 forming an outer circumferential surface of the gasket 1 , and a first soft sealing material in contact with the upper and lower surfaces of the metal clad 20 , respectively. (11) and the second soft sealing material 12 may be included.

The metal clad 20 has a rectangular oval cross-sectional shape rotated 360 degrees in a ring shape to form the outer circumferential surface of the gasket 1, and is preferably provided in a donut shape. In detail, the metal clad 20 is provided in a ring shape, and the first metal clad 21 having a rectangular oval cross-sectional shape with an open lower side and a ring shape provided so as to be in contact with the inner side of the cross-section of the first metal clad 21 As a result, it may be formed including the second metal clad 22 having a rectangular oval cross-sectional shape with an open upper side. That is, the first metal clad 21 has a ring shape with an open lower side and an open upper side of the second metal clad 22, but the second metal clad 22 is in close contact with the inside of the first metal clad 21. By being provided to be in contact, the pair of metal cladding 20 is preferably provided in a rectangular oval shape in which both lower and upper sides are closed. Specifically, the first metal clad 21 and the second metal clad 22 are made of the same material as each other, and are made of a metal material having excellent elasticity and restoring force, even when a high load is applied in the vertical direction. It can absorb a part of the load as it is elastically deformed to suppress the compression phenomenon of the gasket due to compression.

A first soft sealing material 11 and a second soft sealing material 12 may be provided on the upper and lower surfaces of the metal clad 20 , respectively. Here, the first soft sealing material 11 and the second soft sealing material 12 are used to compensate for damaged portions of the sealing surface in contact with the flange and the gasket 1 and to improve sealing properties, and are expanded polytetrafluoro It is preferable to be provided with ethylene (Expanded Polytetrafluoroethylene), graphite or mica material. In detail, the first soft sealing material 11 is provided so as to be in contact with the upper surface of the metal clad 20, and is preferably provided in the shape of a disc with an open inside. In addition, the second soft sealing material 12 is provided so as to be in contact with the lower surface of the metal cladding 20, it is preferable to be provided in the shape of a disc with an open inner side. In detail, the second soft sealing material 12 has a disc shape with an open inner side, and the center is inserted between both open lower ends of the first metal clad 21 so that it comes into contact with the lower surface of the second metal clad 22 . It is preferable to be formed with a step difference. Specifically, the central portion of the second soft sealing material 12 is in contact with the lower surface of the second metal clad 22 , and the edge portion is in contact with the first metal clad 21 . It is preferable to be formed so as to be provided. That is, the second soft sealing material 12 is provided to be inserted into the open lower side of the first metal clad 21 with the lower side open, and the second metal clad 22 provided to be in contact with the inside of the first metal clad 21 . ) is preferably in contact with the lower surface of Therefore, since an empty space is not formed between the second metal clad 22 and the second soft sealing material 12, it is possible to have an appropriate elastic force and restoring force, and even with an excessive external force, the second metal clad 22 and the second soft The sealing material 12 has an effect of preventing damage by buffering each other.

Hereinafter, a gasket according to each embodiment will be described in detail with reference to FIGS. 2 to 7 . 2 is a cross-sectional view of a gasket according to a first embodiment of the present invention, FIG. 3 is a cross-sectional view of a gasket according to a second embodiment of the present invention, and FIG. 4 is a cross-sectional view of a gasket according to a third embodiment of the present invention . 5 is a cross-sectional view of a gasket according to a fourth embodiment of the present invention, FIG. 6 is a cross-sectional view of a gasket according to a fifth embodiment of the present invention, and FIG. 7 is a gasket according to a sixth embodiment of the present invention It is a cross section. Prior to the description of each embodiment, the first to third embodiments to be described later are embodiments having an inner configuration different from the one described above, and the configuration described in the embodiment will be omitted and described. In addition, the first to third embodiments commonly further include a coil spring 30 on the inside of the metal clad 20. The coil spring 30, which is a common configuration, will be described first, and then each embodiment will be described below. to explain

Referring to FIGS. 2 to 4 , the coil spring 30 may be provided as a pair in a ring shape inside each cross-section in the inner circumferential direction and the outer circumferential direction of the metal clad 20 . In detail, provided on the inside of the second metal clad 22 based on the cross-section, the coil springs 30 in a ring shape are provided on both sides of the rectangular oval-shaped curved portion, that is, in the inner circumferential direction and the outer circumferential direction, respectively. One coil spring 30 may be provided. . Therefore, according to the shape and gap of the flange, each coil spring 30 may separately apply elastic and restoring forces to seal the pipe in an airtight manner. Specifically, the coil spring 30 has a ring shape, and is preferably provided with two coil springs having different outer diameters in a shape wound in a spring shape. At this time, the outer diameter and inner diameter of each of the pair of coil springs 30 are provided to be different from each other, but it is preferable that the diameter of the cross-section is the same.

Hereinafter, the first to third embodiments will be described with reference to each drawing.

According to the first embodiment with reference to FIG. 2 , a first inner ring 41 provided in a ring shape between the inner side of the cross-section of the metal clad 20 and the pair of coil springs 30 may be further provided. In detail, based on the cross section of FIG. 2 , the first inner ring 41 may be provided with a rectangular cross section so as to be in contact with the inner upper surface of the first metal clad 21 and the inner lower surface of the second metal clad 22 . have. In more detail, the first inner ring 41 is provided between a pair of coil springs 30, and is preferably provided in a ring-shaped plate shape.

According to the second embodiment with reference to FIG. 3 , the third inner ring 43 and the metal clad 20 are provided in a ring shape between the inner side of the cross-section of the metal clad 20 and the pair of coil springs 30 . A ring-shaped second inner ring 42 provided as a pair on the upper and lower surfaces of the third inner ring 43 may be further provided on the inside of the cross-section. In detail, based on the cross-section of FIG. 3 , a pair of second inner rings 42 are each in a rectangular shape so as to be in contact with the inner upper surface of the first metal clad 21 and the inner lower surface of the second metal clad 22 , respectively. It may be provided with a cross section. More specifically, the second inner ring 42 is provided as a separate pair so as to be in contact with the inner upper surface of the first metal clad 21 and the inner lower surface of the second metal clad 22, respectively, and the pair of second It is preferable that a third inner ring 43 having a rectangular cross-section is provided between the inner rings 42 . Specifically, the outer diameter and inner diameter of the second inner ring 42 and the third inner ring 43 provided in a ring shape are the same as each other, but the thickness of the third inner ring 43 is greater than that of the second inner ring 42 . It is preferable to be provided thickly. More specifically, it is preferable that the cross section of the second inner ring 42 is provided with the sum of the thicknesses of the first metal clad 21 and the second metal clad 22, respectively, and the third inner ring 43 is It is most preferable to be provided with three times the thickness of one side of the second inner ring 42 pair.

According to the third embodiment with reference to FIG. 4 , the ring-shaped fourth inner ring 44 provided as a pair between the inner side of the cross-section of the metal clad 20 and the pair of coil springs 30 and a pair of It is provided between the fourth inner ring 44 may further include a wave ring 50 having a wavy cross-section. In detail, based on the cross-section of FIG. 4 , a pair of fourth inner rings 44 are each in a rectangular shape so as to be in contact with the inner upper surface of the first metal clad 21 and the inner lower surface of the second metal clad 22 , respectively. It may be provided with a cross section. More specifically, the fourth inner ring 44 is provided as a separate pair so as to be in contact with the inner upper surface of the first metal clad 21 and the inner lower surface of the second metal clad 22, respectively, and the pair of fourth A wave ring 50 having a wavy cross-section between the inner rings 44 may be further provided in a ring shape. In this case, the fourth inner ring 44 is preferably provided with a thickness greater than the thickness of the second inner ring 42 of the second embodiment described above, and is provided twice as thick as the thickness of the second inner ring 42 . It is most preferable to be The wave ring 50 may be provided in a zigzag shape so as to be in contact with the upper and lower surfaces of the pair of fourth inner rings 44, respectively, based on the cross section of FIG. 4 . Specifically, the acid is in contact with the lower surface of the fourth inner ring 44 provided on the upper side of the pair of fourth inner ring 44 , and the fourth inner ring 44 provided on the lower side of the fourth inner ring 44 . It is preferably provided in a wavy shape in contact with the valley on the upper surface of the , and is provided in a ring shape formed by rotating a wavy cross-section by 360 degrees.

Hereinafter, the characteristics according to the material of each component of the above-described first to third embodiments will be described in detail. The first inner ring 41 of the first embodiment, the second inner ring 42 and the third inner ring 43 of the second embodiment, and the fourth inner ring 44 of the third embodiment are each polytetrafluoro It may be made of ethylene (Polytetrafluoroethylene) material. Polytetrafluoroethylene material has excellent chemical resistance and has the advantage that its properties do not change stably even at high temperatures (about 325°C). In addition, it has good electrical properties, is non-combustible, has good weather resistance, and has a small wear coefficient due to non-adhesiveness, and is a non-toxic material. Therefore, there is little deformation in the chemical composition of the fluid flowing in the pipe, and there is no deformation even at high temperature for a long period of time, so that it can be used for a long time.

In particular, more specifically, the second inner ring 42 of the second embodiment and the fourth inner ring 44 of the third embodiment are expanded polytetrafluoroethylene made of a softer material than the polytetrafluoroethylene described above. It is preferably provided with a fluoroethylene (Expanded Polytetrafluoroethylene) material. Accordingly, it is possible to provide the gasket 1 having more excellent cushioning action and durability.

Hereinafter, the fourth to sixth embodiments of the present invention will be described in detail with reference to FIGS. 5 to 7 .

5 to 7 are embodiments in which the metal tube O-ring 60 is added or modified based on FIG. 1 , and may be modified by applying any one of the first to third embodiments.

First, the fourth embodiment will be described with reference to FIG. 5 , each of the metal tube O-rings 60 may be further provided inside the pair of coil springs 30 . Here, the metal tube O-ring 60 is used to prevent radial deformation of the silver gasket 1, and is a gasket to prevent deformation in the inner or outer diameter direction as the gasket 1 receives a load in the vertical direction. (1) may be provided as a pair, one on both sides of the inner circumferential direction and the outer circumferential direction. In detail, according to the fourth embodiment, the metal tube O-ring 60 is arranged in a ring shape inside the coil spring 30 provided as a pair on both sides of the gasket 1, and as the sealing width increases, the sealing property is improved. is improved, and the restoring force of the coil spring 30 may be improved by the elasticity of the metal tube O-ring 60 . At this time, the metal tube O-ring 60 is preferably made of a rust-resistant metal, for example, alloy steel or stainless steel.

6 is a view showing a fifth embodiment. According to the fifth embodiment, the coil spring 30 is not provided, and a pair of metal tube O-rings 60 may be provided instead of the coil spring 30 . The metal tube O-ring 60 may be provided in a ring shape with an open inner side so as to seal the pipe airtightly by applying an elastic force and a restoring force. Specifically, the metal tube O-rings 60 are provided in pairs on both sides to have different outer diameters, and it is preferable that the cross-sectional diameters are the same.

7 is a view showing a sixth embodiment. According to the sixth embodiment, it is provided on the inside of the second metal clad 22, and is provided in a pair of both curved portions of a rectangular oval shape, that is, one in a ring shape in the inner circumferential direction and the outer circumferential direction of the gasket 1, respectively. A coil spring 30 may be further provided inside the metal tube O-ring 60 , respectively. At this time, the coil spring 30 is for improving the restoring force of the metal tube O-ring 60 , and is preferably provided so as to be in contact with the inner side of the cross-section of the metal tube O-ring 60 .

Hereinafter, the effect of the above-described gasket 1 will be described with reference to FIG. 8 . 8 is a view showing a state in which a deviation occurs in the spacing between the flanges.

Referring to FIG. 8 , the gasket 1 of the present invention described above may be provided between the first flange F1 and the second flange F2 formed between the first pipe P1 and the second pipe P2. 8, when the gap between the first flange F1 and the second flange F2 is not uniformly provided due to damage to the first flange F1 and the second flange F2 due to the use of the gasket 1 for a long period of time or an old pipe, the gasket of the present invention When (1) is applied, even if the gap between the first flange F1 and the second flange F2 is not constant, it can be sealed in close contact with each other. Accordingly, damage to the gasket 1 due to contact with air and leakage of fluid flowing through the pipe can be prevented, and the distance between the first flange F1 and the second flange F2 is not constant or has a slight deviation. Even if a gap is generated due to the occurrence of , the sealing can be maintained by the restoring force of the metal gasket 1 .

The above-described embodiments are only the most preferred embodiments of the present invention, and various changes and substitutions may be made by those skilled in the art. Therefore, the scope of the present invention is not limited only to the above-described embodiments.

Claims

In the gasket (1) mounted between the first flange (F1) and the second flange (F2) to prevent leakage of fluid,

a metal clad 20 provided in a ring shape to form an outer circumferential surface of the gasket 1;

a first soft sealing material 11 provided in contact with the upper surface of the metal clad 20 and provided in the shape of a disc with an open inner side; and

and a second soft sealing material (12) provided in contact with the lower surface of the metal clad (20) and provided in the shape of a disc with an open inner side.
The method of claim 1,

The gasket further comprising a; coil springs (30) provided as a pair of ring-shaped inside cross-sections in each of the inner circumferential direction and the outer circumferential direction of the metal clad (20).
The method of claim 1,

The gasket further comprising: a pair of metal tube O-rings (60) provided in a ring shape inside each end face in the direction of the inner circumferential surface and the outer circumferential direction of the metal clad (20).
3. The method of claim 2,

A gasket, characterized in that each further comprises a ring-shaped metal tube O-ring (60) inside the coil spring (30) provided as a pair.
4. The method of claim 3,

A gasket, characterized in that each further comprises a ring-shaped coil spring (30) inside the metal tube O-ring (60) provided as a pair.
5. The method according to claim 2 or 4,

It further comprises a; gasket that does.
5. The method according to claim 2 or 4,

a third inner ring 43 provided in a ring shape between the inner side of the cross-section of the metal clad 20 and a pair of coil springs 30; and

A ring-shaped second inner ring 42 provided on the inner side of the cross-section of the metal clad 20 and provided as a pair on the upper and lower surfaces of the third inner ring 43; characterized in that it further comprises gasket.
5. The method according to claim 2 or 4,

a fourth inner ring 44 having a ring shape provided as a pair between the inner side of the metal clad 20 and the pair of coil springs 30; and

The gasket further comprising; a wave ring (50) provided between the pair of fourth inner rings (44) and having a wavy cross-section.
6. The method according to any one of claims 1 to 5,

The metal clad 20,

A first metal clad 21 having a rectangular oval cross-sectional shape with an open lower side in a ring shape; and

and a second metal clad (22) having a rectangular oval cross-sectional shape with an open upper side in a ring shape provided to be in contact with an inner side of the cross-section of the first metal clad (21).
10. The method of claim 9,

The second soft sealing material 12,

A gasket having a disc shape with an open inner side, and a central portion is inserted between both ends of the first metal clad (21) and provided with a step so as to be in contact with the lower surface of the second metal clad (22).
8. The method of claim 7,

The third inner ring 43 is made of a polytetrafluoroethylene material, and the second inner ring 42 is made of an expanded polytetrafluoroethylene material. .
9. The method of claim 8,

The fourth inner ring (44) is a gasket, characterized in that provided with an expanded polytetrafluoroethylene (Expanded Polytetrafluoroethylene) material.
6. The method according to any one of claims 1 to 5,

The first soft sealing material 11 and the second soft sealing material 12,

A gasket, characterized in that it is provided with any one of expanded polytetrafluoroethylene (Expanded Polytetrafluoroethylene), graphite (Graphite) or mica (Mica) material.