JPH0247808Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a gasket that is used for sealing blast furnace doors, electric furnace doors, etc. and has excellent heat resistance and heat insulation properties.

Technical background of the invention and its problems Gaskets used in blast furnace doors or electric furnace doors in steel plants are used under high-temperature conditions of 600°C or higher, so heat resistance is first of all required. It is required to have excellent compressive recovery properties and compressive strength at high temperatures. Furthermore, the surfaces of blast furnace doors and electric furnace doors are generally not very precisely finished, and are often distorted due to repeated thermal changes, so gaskets require a good seal. In order to exhibit its properties, it is required to have excellent flexibility.

Conventionally, gaskets used under the above-mentioned high-temperature conditions have been made using asbestos fibers as the base fiber for forming the gasket, and rubber such as natural rubber latex or silicone rubber is attached to the asbestos fibers. It has been used to form fibers by winding them, laminating them, and then compressing them. In some cases, gaskets have also been used in which a mixture of asbestos fibers and metal wires is used as the base fiber for gasket formation in order to improve heat resistance.

However, when a gasket formed using such asbestos-based fibers as a base fiber is used for blast furnace gas or electric furnace doors, the crystal water contained in asbestos is detached, and the asbestos fibers also contain Because the small amount of organic fiber contained is burned, the base fiber becomes tattered.
The problem was that it could only be used for two months and its durability was poor. When trying to replace gaskets used in blast furnace doors or electric furnaces,
The furnace temperature had to be lowered once, which resulted in a large operational and thermal loss.

By the way, in order to solve the above-mentioned problems associated with gaskets that use asbestos as the base fiber material for gasket formation, it is possible to use metal gaskets with excellent heat resistance. Since the surface is hard, there is a problem in that the gasket mounting surface of the blast furnace door or electric furnace door may be scratched or deformed.

In order to eliminate such inconveniences, the present applicant proposed a gasket with a cross-sectional shape as shown in Fig. 2, and previously filed an application (Utility Application No. 152265/1986).
issue).

The gasket 1 shown in FIG. 2 is a gasket-forming base fiber body 2 formed by laminating heat-resistant fibers.
The silica fiber 3 is wound around the outer circumference at least once. In the case of such a gasket 1, since the silica fiber has excellent heat resistance and heat insulation properties, the obtained gasket has excellent heat resistance and heat insulation properties.

However, such a gasket 1 has too much flexibility, which may make handling and installation of the gasket complicated. In addition, when the wall thickness of such gasket 1 is large, the compressibility and sealing performance in the area B near the tightening load are sufficient, but the compressibility and sealing performance in the central area A become insufficient. I was afraid.

Purpose of the invention The present invention was created in view of these circumstances, and it can be used under high-temperature conditions of 600℃ or higher, and has excellent compressive recovery properties and compressive strength at high temperatures. Moreover, it is an object of the present invention to provide a gasket that has excellent workability during handling and installation, and has excellent sealing performance.

Summary of the invention In order to achieve the above object, the gasket according to the invention includes a gasket-forming base fibrous body made of heat-resistant inorganic fibers provided around the outer periphery of a metal core body, and a gasket-forming base fibrous body made of heat-resistant inorganic fibers. It is characterized in that it is made by winding a heat-resistant inorganic fiber textile body at least once or more.

In the gasket according to the present invention, the heat-resistant inorganic fiber fabric is wound at least once around the outer periphery of the gasket-forming base fiber body made of heat-resistant inorganic fibers that includes a metal core inside. Since the heat-resistant inorganic fiber has excellent heat resistance and heat insulation properties, the resulting gasket has excellent heat resistance and heat insulation properties, and can be used even at high temperatures of 600°C or higher. Furthermore, since the gasket-forming base fibrous body made of asbestos fiber or the like has excellent compressive resilience and compressive strength, the resulting gasket also has excellent compressive resilient properties and compressive strength. Furthermore, since a metal core is mounted inside such a gasket, the gasket as a whole has appropriate strength, and the handling and installation workability thereof is improved.
Moreover, since the gasket has a metal core inside it, when the gasket is tightened, the tightening force of the gasket against the base fiber for forming the gasket increases due to the metal core. , the sealing performance will be improved.

DETAILED DESCRIPTION OF THE INVENTION A gasket according to the present invention will be described below based on embodiments shown in the drawings.

As shown in FIG. 1, the gasket 5 according to the invention
is formed by laminating a gasket-forming base fiber body 7 of approximately the same thickness on a plate-shaped metal core body 6, and winding a heat-resistant inorganic fiber textile body 8 around the outer periphery thereof at least once or more. .

The metal core 6 may be a metal rod or a metal tube in addition to various metal plates such as iron or aluminum.

Further, as the base fiber body 7 for forming the gasket, heat-resistant inorganic fibers are used, and specifically, asbestos fibers, silica fibers, ceramic fibers, glass fibers, graphite-containing fibers, etc. are used. Among these, asbestos fibers and silica fibers to which silicone rubber or natural rubber latex is attached are particularly preferred.

In order to attach rubber such as silicone rubber to asbestos fibers, for example, the fibers may be impregnated or passed through a rubber solution, or rubber may be applied to the surface of the fiber body.

By attaching rubber to the fibrous bodies as described above, the fibrous bodies are adhered to each other, thereby giving the obtained gasket an appropriate amount of compressive deformation, thereby improving the sealing performance of the gasket. Can be done. Therefore, it is preferable to attach rubber to the fibrous body.

The silica fiber used is, for example, one made of amorphous silica, woven from continuous filaments with a diameter of 8 to 10 μm, and containing 90% or more, preferably 95% or more of silicon dioxide. Trace components other than silicon dioxide include titanium dioxide, aluminum oxide, magnesium oxide,
Contains calcium oxide and boron oxide.

Silica fibers as described above do not melt or elevate even when used continuously for a long time at temperatures of 1000°C to 1200°C, and have excellent heat resistance. Furthermore, this silica fiber has low thermal conductivity and excellent heat insulation properties.

Further, as the heat-resistant inorganic fiber woven body 8, a material obtained by spinning heat-resistant inorganic fibers is used. As the heat-resistant inorganic fibers, the same fibers as those constituting the gasket-forming base fiber body 7 are used.
It is particularly preferable to use a silica fiber fabric as the heat-resistant inorganic fiber fabric 8.

When a silica fiber fabric is used as the heat-resistant inorganic fiber fabric 8 located on the outermost surface of the gasket 5, even if the gasket 5 according to the present invention is used continuously under high temperature conditions, the silica fibers on the surface Although the woven material reaches a high temperature, the internal gasket-forming base fibers do not reach such high temperatures, and the gasket-forming base fibers have excellent flexibility, compressive recovery properties, and compressive strength that are not lost. Effects can be obtained.

In order to increase the abrasion resistance of such heat-resistant inorganic fiber body 8, heat-resistant silicone rubber, silicone oil, etc. can be applied to the surface of the textile body, and aluminum vapor deposition treatment can also be performed. In some cases, the abrasion resistance of the gasket can be improved by providing an asbestos fiber fabric mixed with metal wire on the surface of the outermost layer of the fabric 8.

The gasket according to the present invention having the above structure has a compressive load of 5 to 100 kg/ ^cm2.
It is preferable that the amount of compression deformation is 40%. If the amount of compressive deformation of the gasket is less than 5%, the gasket itself will become too hard and have poor flexibility, and if the gasket mounting surface is deformed or distorted, good sealing performance will not be obtained, which is undesirable.
On the other hand, if the amount of compressive deformation exceeds 40%, the gasket itself becomes too soft, resulting in insufficient compressive stress, which is undesirable because the sealing performance deteriorates.

Note that the cross-sectional shape of the gasket according to the present invention can be rectangular, square, circular, elliptical, semicircular, or the like.

Next, a method for manufacturing a gasket according to the present invention will be explained.

First, the metal core 6 is cut into a predetermined size,
This metal core body 6 is cut into a predetermined width, and then sandwiched between seven layers of two laminated and press-bonded base fibers and further press-bonded to produce a preformed product. Next, a heat-resistant inorganic fiber fabric 8 coated with an epoxy adhesive on one side is wound around the outer periphery of the obtained preform at least once, preferably about 2 to 3 times, and then pressure bonded.

Effects of the Invention As explained above, according to the gasket according to the present invention, a gasket-forming base fibrous body made of heat-resistant inorganic fiber is provided on the outer periphery of a metal core, and the gasket-forming base fibrous body The heat-resistant inorganic fiber woven material is wound around the gasket at least once, and since these gasket-forming base fibers and the heat-resistant inorganic fiber woven material have excellent heat resistance and heat insulation properties, the resulting gasket also has excellent heat resistance. It has heat and heat insulation properties. Moreover, since the gasket according to the present invention can use asbestos fiber or the like as the base fiber for forming the gasket,
It has excellent compression resilience and compressive strength similar to gaskets made from asbestos fibers.

In particular, according to the present invention, since the metal core is contained inside the gasket, the obtained gasket always maintains its original shape, making it easy to handle and to attach the gasket. Although it is difficult to install a gasket especially in a high-temperature atmosphere, the present invention makes the work much easier than before.

Furthermore, when the gasket according to the present invention is tightened,
The heat-resistant inorganic fiber between the mating surfaces is compressed around the metal core, and the tightening compressive force works effectively, producing an excellent effect of improving sealing performance.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a gasket according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a gasket recently proposed by the applicant. 5...Gasket, 6...Metal core, 7...
Base fiber body for gasket formation, 8... Heat-resistant inorganic fiber textile body.

Claims (1)

[Claims for Utility Model Registration] 1. A gasket-forming base fibrous body made of heat-resistant inorganic fiber is provided on the outer periphery of a metal core, and at least one heat-resistant inorganic fiber woven body is provided on the outer periphery of the gasket-forming base fibrous body. A gasket made by winding more than one circumference. 2. A request for registration of a utility model characterized in that the metal core is plate-shaped, and the gasket-forming base fibers having approximately the same thickness are laminated on the front and back surfaces of the plate-shaped metal core. The gasket according to item 1.