KR20220124893A - High temperature gasket - Google Patents

Abstract

The present invention relates to a high-temperature gasket. The high-temperature gasket includes: a ring-shaped first sealing part formed by winding sealing materials having a metal quality around one central axis; a second sealing part of a metal quality provided on an inner circumference surface of the first sealing part and having a ring shape; and a filler positioned between the sealing materials wound and overlapped with each other, made of a heat-resistant material, and having a ceramic coating layer formed on the outer surface thereof. In accordance with the present invention, the filler is provided between the sealing materials of the first sealing part to improve the airtightness and stability of the first sealing part, and patterns formed on upper and lower sides of the second sealing part improve an adhesive force between the gasket and the flange to improve airtightness, and also, sealing layers formed on the upper and lower sides of the second sealing part provide secondary sealing, thereby minimizing leakage. Moreover, an opening part is provided in the second sealing part to minimize damage caused by friction, and an O-ring or spring is provided in the opening part to improve the shape restorability of the opening part, and minimize damage to the opening part.

Description

Gasket for high temperature {HIGH TEMPERATURE GASKET}

The present invention relates to gaskets. More particularly, it relates to a high-temperature gasket comprising a ceramic-coated filler.

A gasket, which is a static seal that prevents leakage by being fastened to a fixed joint surface of a mechanical device with a bolt, etc. It performs a sealing function by blocking the seam between the flanges, which is a connection part, from the outside while being compressed.

Since an accident occurs when a gasket mounted in such a plant is easily damaged at high temperature and high pressure, in order to prevent this, a number of prior art techniques for high-temperature gaskets with high stability and durability while securing airtightness have been disclosed. have.

However, in conventional high-temperature gaskets, a rubber sealing material is inserted into a ring-shaped groove formed on the upper and lower edges of the gasket core, or a neoprene rubber or fluororesin-based PTFE sealing member is applied to the entire upper and lower surfaces of an insulating material made of epoxy or phenolic. Although it was inserted with a sealing material to perform both sealing and insulation functions, there was a limitation in that the sealing material was damaged during use in a high-temperature and high-pressure environment, so that a perfect sealing function could not be performed. In addition, in the case of piping that transports flammable liquids in a high-temperature environment, if the gas tightness of the gasket is low, there is a risk that the fluid in the piping may leak and cause a secondary explosion.

In order to overcome the limitations of the disclosed gaskets, in the present invention, a gasket having a ceramic coating layer formed thereon is included in the sealing portion, thereby providing a gasket capable of performing a sealing function without damage to the sealing portion even in a high-temperature and high-pressure environment.

Prior Document 1: Republic of Korea Patent Publication No. 10-2013-0067176 (published on June 21, 2013) Prior Document 2: Republic of Korea Patent Publication No. 10-2020-0060054 (published on May 29, 2020)

It is an object of the present invention to provide a high-temperature gasket that maintains airtightness in a high-temperature, high-pressure environment.

Another technical object of the present invention is to provide a high-temperature gasket with increased durability by minimizing the risk of damage in a high-temperature and high-pressure environment.

In order to solve the above problems, the present invention provides an annular first sealing part formed by winding a sealing material having a metal material based on one central axis; a second sealing part provided on an inner circumferential surface of the first sealing part and made of a metal material having an annular shape; and a filler positioned between the wound and overlapping sealing materials, made of a heat-resistant material, and having a ceramic coating layer formed on an outer surface thereof.

According to the present invention, since a filler is provided between each sealing material of the first sealing part, airtightness and stability of the first sealing part are improved.

According to the present invention, as the pattern is formed on the upper and lower surfaces of the second sealing part, the adhesion between the gasket and the flange is improved, thereby improving airtightness.

According to the present invention, as the sealing layer is formed on the upper surface and the lower surface of the second sealing part, a secondary sealing is provided, so that leakage can be minimized.

According to the present invention, since the opening is provided in the second sealing part, it is possible to minimize damage due to friction.

According to the present invention, an O-ring or a spring is provided inside the opening, thereby improving the shape restoring force of the opening and minimizing damage to the opening.

1 is a cut-away perspective view of a gasket for high temperature according to an embodiment of the present invention.
2 is a cross-sectional view of a gasket for high temperature according to an embodiment of the present invention.
3 is an enlarged view of A of FIG. 2 .
4 is a cross-sectional view of a gasket for high temperature in which an opening is formed according to an embodiment of the present invention.
FIG. 5 is an enlarged view of A' of FIG. 4 .
6 is a cross-sectional view of a gasket for high temperature having an O-ring in an opening according to an embodiment of the present invention.
FIG. 7 is an enlarged view of A" of FIG. 6 .
FIG. 8 is an enlarged view of FIG. 2A, and is a cross-sectional view of a gasket for high temperature in which a pattern and a sealing layer are formed on a second sealing part according to an embodiment of the present invention.

Objects and effects of the present invention will become clearer through the following detailed description, but the objects and effects of the present invention are not limited only by the following description. In addition, in describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them. However, the present invention may be implemented in various different forms and is not limited to the embodiments disclosed below. In addition, in order to clearly disclose the present invention in the drawings, parts irrelevant to the present invention are omitted, and the same or similar symbols in the drawings indicate the same or similar components.

1 is a cut-away perspective view of a gasket for high temperature (G) according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a gasket for high temperature according to an embodiment of the present invention, and FIG. 3 is an enlarged view of A in FIG. It is a drawing. 1 to 3, the high-temperature gasket (G) according to the present invention is a ring-shaped first sealing part 100, a second sealing part 200 provided on the inner circumferential surface of the first sealing part 100. and an outer ring 300 provided on an outer circumferential surface of the first sealing part 100 .

The first sealing part 100 is a configuration formed by winding the sealing material 110 and the filler 120 based on one central axis (Z). In detail, the sealing material 110 and the filler 120 may be provided to have a "W" shape in which the cross section is rotated 90 degrees in the counterclockwise direction. Specifically, the sealing material 110 having a “W” shape in cross section is wound on a plane based on one central axis (Z) so as to have a plurality of layers, and the filler 120 is positioned between each wound sealing material 110 . Thus, the first sealing part 100 is formed. Therefore, the first sealing part 100 has excellent airtightness by concentrating the load of the flange to the protrusion through the protrusion formed on the sealing material 110 . As such, when the cross-sections of the sealing material 110 and the filler 120 are provided in a “W” shape, compared to a general sealing material, the winding is stronger and the breakage rate is reduced. It has the effect of improving durability because it is possible to more easily distribute the pressure and load.

The sealing material 110 is a configuration constituting the basic shape of the first sealing part 100, and is preferably made of a material capable of maintaining excellent compression and restoring force at high pressure and high temperature. In detail, it may be provided with a material such as stainless steel or Inconel. More specifically, it may be provided with a material such as stainless steel 347 or Inconel 825. As the most preferred embodiment for the sealing material 110, the sealing material 110 is to be provided to include 30 to 70 parts by weight of iron (Fe), 5 to 25 parts by weight of chromium (Cr), and 3 to 25 parts by weight of titanium (Ti). can

The filler 120 is positioned between the wound and overlapped sealing materials 110 to adhere the sealing material 110 and to prevent leakage in the winding direction. In detail, since the first sealing part 100 is formed by winding the sealing material 110 based on one central axis Z, there may be an empty gap between each ply of the sealing material 110 provided in a plurality of layers, and , there is a risk of fluid leakage along the winding direction. The filler 120 is configured to prevent this, and is positioned between each ply of the sealing material 110 to fill the gap between each ply of the sealing material 110 to bond each ply of the sealing material 110 . For this purpose, the filler 120 is preferably made of a heat-resistant material having elasticity. In detail, the filler 120 may be made of graphite or mica. When the filler 120 is provided with graphite or mica material as described above, the insulation of the high-temperature gasket (G) is improved and the load applied to the gasket (G) can be more easily distributed due to the elasticity of the material. have. In the most preferred embodiment for the filler 120, the filler 120 is to be provided to include 70 to 95 parts by weight of aluminum (Al), 5 to 20 parts by weight of titanium (Ti), and 0.1 to 3 parts by weight of iron (Fe). can

As another preferred embodiment of the filler 120 , the filler 120 may have a ceramic coating layer 121 formed on its outer surface. The ceramic coating layer 121 is an outer surface of the filler 120 coated with a ceramic material, and when the ceramic coating layer 121 is formed on the surface of the filler 120 as described above, the insulation of the high-temperature gasket (G) can be secured. can

Furthermore, in order to improve the insulation of the high-temperature gasket G according to the present invention, the ceramic coating layer 121 may be formed on the entire surface of the first sealing part 100 . Alternatively, a ceramic coating layer 121 is formed on the surface of each of the sealing material 110 and the filler 120, and the sealing material 110 is wound and the filler 120 is filled in the overlapping gaps, so that the annular first sealing part After the (100) is formed, the ceramic coating layer 121 is double formed on the entire surface to maximize the insulation of the gasket (G).

The second sealing part 200 is provided in an annular shape on the inner circumferential surface of the first sealing part 100 to improve airtightness. The second sealing part 200 is preferably made of a metal material. The second sealing part 200 distributes the load applied to the first sealing part 100 from the flange by providing secondary airtightness, thereby improving the airtightness and durability of the gasket (G). In addition, even if the first sealing part 100 is damaged, the second sealing part 200 prevents the leakage of fluid, thereby improving the stability of the gasket (G). In a preferred embodiment, the first sealing part 100 has a first height D1, and the second sealing part 200 is provided to have a second height D2 lower than the first height D1. can Since the first sealing part 100 is provided higher than the second sealing part 200, the airtightness of the first sealing part 100 can be easily operated, and the second sealing part 200 provides secondary airtightness, The load applied to the first sealing part 100 may be dispersed. In addition, since the second sealing part 200 is provided on the inner peripheral surface of the first sealing part 100 , the winding of the sealing material 110 is prevented from being unwound toward the inner side IN.

The outer ring 300 is provided in an annular shape on the outer circumferential surface of the first sealing part 100 to guide the position of the gasket G positioned between the flanges. In detail, the flange on which the gasket G is disposed is fastened to each other with bolts and nuts arranged along the circumferential direction, and the outer surface of the outer ring 300 is in contact with the inner surface of the bolt passing through the flange. It is possible to place the gasket (G) in the correct position between the flanges.

As another example, the outer ring 300 may be implemented such that a groove through which the bolt can be penetrated is formed to allow the bolt to pass through the groove, so that the gasket G is guided to the correct position of the flange. As another example, the outer ring 300 is a semicircle or arc-shaped groove is formed and the gasket (G) is guided to the correct position of the flange by positioning the outer surface of the bolt penetrating the flange on the semicircle or arc-shaped side surface. can be implemented. Therefore, by the outer ring 300, the gasket (G) can be fixed to the correct position without deviating from the sealing position. In addition, the outer ring 300 is provided on the outer peripheral surface of the first sealing part 100 to prevent the winding of the sealing material 110 from being unwound toward the outside (OUT). To this end, the outer ring 300 is formed to protrude along the outer circumferential surface of the first sealing part 100, and may be provided in the shape of a ring, a ring, or a frame. In addition, it is preferable that the outer ring 300 is provided with a third height D3 equal to or lower than the second height D2 of the second sealing part 200 .

4 is a cross-sectional view of a gasket (G) for high temperature in which an opening (C) is formed according to an embodiment of the present invention, and FIG. 5 is an enlarged view of A' of FIG. 4 . 4 and 5 , in the gasket G for high temperature according to the present invention, an opening C may be formed on the inner circumferential surface of the second sealing part 200 . This is a configuration for minimizing damage to the inner peripheral surface of the second sealing part 200 that is subjected to pressure due to continuous contact.

6 is a cross-sectional view of a gasket for high temperature having an O-ring (O) in the opening (C) according to an embodiment of the present invention, and FIG. 7 is an enlarged view of A" of FIG. 6 . For reference, the gasket (G) for high temperature according to the present invention may be provided with an O-ring (O) inside the opening (C).

The O-ring O is a ring made of an elastic material having a circular cross section, and may be provided so that an outer circumferential surface is in contact with an inner circumferential surface of the opening C. By providing the O-ring (O), the restoring force and sealing properties of the gasket (G) may be improved. In detail, since the O-ring O serves as a self-energizing function, the restoring force and sealing property of the gasket G may be improved. Self-actuation is a function in which the O-ring (O) operates adaptively to the pressure inside the tube. Specifically, when the pressure inside the tube rises, the first sealing part 100 that is exposed to the fluid and can expand is compressed with each other so that the O-ring O is more in contact with the flange, thereby strengthening the adhesion to the flange.

In a more preferred embodiment, a spring (S) may be provided inside the opening (C). By being provided with the spring (S), it has the effect of improving the restoring force of the opening (C), which can be deformed in shape by contact with the flange by providing a large yielding property to the opening (C). In detail, the size of the spring (S) is preferably provided so as to fill the inside of the opening (C), that is, the outer peripheral surface of the spring (S) is provided so as to be in contact with the curved surface formed inside the opening (C). The spring (S) is configured to provide a restoring force to maintain the shape of the opening (C) inside the opening (C), and even when an external force is applied to the opening (C), the spring (S) maintains its original shape to maintain airtightness. It has a function of supporting the shape of the opening (C) using

FIG. 8 is an enlarged view of FIG. 2A, and is a cross-sectional view of a gasket G for high temperature in which a pattern P and a sealing layer 210 are formed on the second sealing part 200 according to an embodiment of the present invention. . Referring to FIG. 8 , the gasket G for high temperature according to the present invention may be provided such that a pattern P and a sealing layer 210 are formed on the upper and lower surfaces of the second sealing part 200 .

The pattern (P) is a configuration that is formed on the upper and lower surfaces of the second sealing part 200 so that the cross section has a zig-zag or curved wave shape, and increases the adhesion between the gasket (G) and the flange. It has the effect of increasing the airtightness by increasing it.

The sealing layer 210 is formed on the upper and lower surfaces of the second sealing part 200 to improve the airtightness of the gasket G, and is made of mica, graphite, or vermiculite. it is preferable In detail, the sealing layer 210 is made of an elastic material and is formed to correspond to the shape of the pattern P formed on the upper and lower surfaces of the second sealing part 200 . By providing the sealing layer 210 in this way, it is possible to prevent a minute gap from occurring between the gasket G and the flange to improve airtightness, and the elasticity of the sealing layer 210 makes it easier to reduce the load on the flange. be able to support Although the sealing layer 210 is shown in a plate shape that does not correspond to the shape of the pattern P in FIG. 8 , the sealing layer 210 is made of a material having elasticity and when installed on the pattern P, the upper portion of the gasket G And it is preferable that the second sealing part 200 is compressed and formed on the upper and lower surfaces of the second sealing part 200 to correspond to the shape of the pattern P by the pressure acting on the lower part.

As described above, since the pattern P and the sealing layer 210 are formed on the upper and lower surfaces of the second sealing part 200 , the adhesion between the second sealing part 200 and the flange can be improved. In addition, when an external force is applied to the second sealing part 200 , it may act as a buffer, thereby minimizing damage to the second sealing part 200 . The pattern P and the sealing layer 210 may be formed on the upper surface and the lower surface of the first sealing part 100 as necessary.

The above-described preferred embodiments of the present invention have been disclosed for purposes of illustration, and various modifications, changes and additions may be made by those skilled in the art with respect to the present invention within the spirit and scope of the present invention. It should be considered as belonging to the scope of the above claims. In addition, a person of ordinary skill in the art to which the present invention pertains, various substitutions, modifications and changes are possible without departing from the technical spirit of the present invention. It is not limited.

In the exemplary system described above, the methods are described on the basis of a flowchart as a series of steps or blocks, however, the present invention is not limited to the order of steps, and some steps may occur in a different order or concurrently with other steps as described above. can In addition, those skilled in the art will understand that the steps shown in the flowchart are not exhaustive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the present invention.

100: first sealing part
110: sealing material
120: filler 121: ceramic coating layer
200: second sealing part 210: sealing layer
300: outer ring
G : gasket Z : central axis
P: pattern C: opening
O : O-ring S : Spring

Claims (6)

a first sealing part 100 having an annular shape formed by winding a sealing material 110 having a metal material based on one central axis (Z); and
and a second sealing part 200 of a metal material provided on the inner circumferential surface of the first sealing part 100 and having an annular shape;
The first sealing part 100,
A gasket for high temperature, which is positioned between the wound and overlapped sealing materials (110), is made of a heat-resistant material, and includes a filler (120) having a ceramic coating layer (121) formed on its outer surface.
The method of claim 1,
A gasket for high temperature, characterized in that it further comprises an annular outer ring (300) provided on the outer peripheral surface of the first sealing part (100).
The method of claim 1,
A high-temperature gasket, characterized in that a pattern (P) having a cross section of a zig-zag shape is formed on the upper and lower surfaces of the second sealing part (200).
3. The method of claim 2,
The second sealing part (200) is a gasket for high temperature, characterized in that the sealing layer (210) of mica (Mica), graphite (Graphite) or vermiculite (Vermiculite) material is formed on the upper and lower surfaces.
The method of claim 1,
The sealing material 110,
30 to 70 parts by weight of iron (Fe), 5 to 25 parts by weight of chromium (Cr), and 3 to 25 parts by weight of titanium (Ti), a gasket for high temperature.
The method of claim 1,
The filler 120 is
70 to 95 parts by weight of aluminum (Al), 5 to 20 parts by weight of titanium (Ti), and 0.1 to 3 parts by weight of iron (Fe), a gasket for high temperature.

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