JPS58149472A - Seal member - Google Patents

Abstract

PURPOSE:To prevent a seal member from being embritted at high temperatures and prevent a sealing function from being lowered, by using vermiculite as a main constituent of a refractory material constituting the seal member. CONSTITUTION:Since the seal member 13 is so constructed that a core member 15 is not exposed at the surface of a refractory layer 14 and, unlike a conventional seal member, it is not in the form of metallic mesh envolving cavities, gases are prevented from penetrating into or through the member 13, and a high sealing performance of the member 13 is secured. The refractory layer 14 comprises vermiculite as a main constituent, and has heat resistance and expanding property at high temperatures, so that the sealing property at high temperatures is also enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seal member, and more particularly to a 7-ring member suitable for a pipe joint for a vibrating high-temperature pipe.

In a front-wheel drive vehicle with a front transverse engine (hereinafter abbreviated as FF vehicle), the axis of the engine and the center line of the vehicle body are at right angles, so the axis of the exhaust manifold and the axis of the exhaust pipe are also at right angles. Rotational vibration around the exhaust manifold axis caused by engine rotation acts on the exhaust pipe as a bending moment in a direction perpendicular to the axis. Therefore, a pipe joint that can absorb this bending moment is required at the connection between the exhaust manifold and the exhaust pipe, but conventional I
="The sealing member used in the pipe joint in Ffb does not have such a function.

FIG. 1 shows a pipe joint in a conventional FF vehicle. Here, 1 is an exhaust manifold connected to an exhaust manifold (not shown), and 2 is an exhaust pipe extending in the longitudinal direction of the vehicle body. Reference numeral 6 denotes a flange at the end of the exhaust manifold pipe 1, and the flange 3 is provided with a pair of elongated holes 4 extending in a direction perpendicular to the plane of the paper.

5 is a spherical flange at the end of the exhaust pipe 2;
A ring-shaped sealing member 6, which is pressed against the surface of the ring, is pressed from the outer circumferential side. The outer circumference of the spherical 7-flange 5 is parallel to the surface of the 7-flange 6, and has a bolt insertion hole 7 extending therethrough corresponding to the elongated hole 4 of the flange 3. The spherical flanges 5 and 7 flange 3 are pressed against each other by bolts 8, nuts 9, and pressing springs 10, and the sealing member 6 is fitted onto the end of the exhaust manifold 1 and is pressed against the flange 3. .

For example, the sealing member 6 of the pipe joint as described above is
There is a known sealing member disclosed in Japanese Patent No. 4-76759. This known sealing member, as shown in FIG.
A band-like fireproof plate 11 made of graphite or silicone-adhesive mica paper, etc. is rolled up into a cylindrical shape as shown in FIG. The seal member 6 has a cross-sectional shape as shown in the figure.

However, the above-mentioned known sole members had the following drawbacks and were unsuitable as sealing members for pipe joints in front-wheel drive vehicles. That is, (a) if the fireproof plate material is graphite, it oxidizes and disappears at temperatures above 400°C, making it unsuitable as a high-temperature tunnel member; (b) the fireproof plate material is 7 recone impregnated mica paper. (C) As shown in FIG. 2, the width of the fireproof plate material 11 and the metal mesh no. 12 are equal;
As shown in FIG. 4, since the metal mesh layer 12 is exposed on the surface, there are drawbacks such as a loss of 7-layer properties.

The pipe joint shown in FIG. 1 which incorporates the known 7-hole member is as follows:
Since the seal member has a nearly spherical outer peripheral surface, it can absorb bending moments in the direction perpendicular to the tube axis and rotational vibrations about the tube axis. However, if a tensile force is applied in the direction of the tube axis, It also has the disadvantage that the flange 3, 5 and the sealing member 6 become separated and the sealing action is lost.

The object of the present invention is to provide an improved sealing member, which does not have the disadvantages of the known sealing members mentioned above, and is particularly suitable for pipe fittings for vibrating, high-temperature pipes. Another object of the invention is to provide an improved sealing member capable of compensating for the drawbacks of the above-mentioned pipe joints.

The sealing member of the present invention is made of a refractory material layer containing vermiculite as a main component, and at least one metal thin plate embedded in the refractory material layer and provided with a large number of claws or small protrusions on at least one surface. It is composed of a core material. The sealing member in a preferred embodiment of this invention is
The refractory material layer is formed by laminating belt-shaped or plate-shaped refractory materials containing vermiculite as a main component, and the core material made of thin metal plate is embedded so as not to be exposed on the surface of the refractory material layer. The sealing member of the present invention is characterized in that the fireproofing material used is based on a patent application filed by the present applicant, and is suitable as a sealing material for high temperatures because it has the property of being stable and expanding at high temperatures. The core material embedded in the material layer does not create voids in the sole member, so there is no risk of gas leaking inside the sealing member, and the claws etc. provided on the surface of the core material dig into the refractory material layer. Therefore, the bond between the refractory material layer and the core material is strong, and no voids are formed in the core material.

Examples will be described below with reference to the drawings.

FIG. 5 is a half longitudinal sectional view of the sealing member 16 according to the first embodiment of the present invention. In the figure, the entire sealing member 16 is composed of a refractory material layer 14 mainly composed of vermiculite,
At least one core material 15 made of a thin metal plate is embedded in the refractory material layer 14 so as not to be exposed from the surface. The refractory material layer 14 can be formed by laminating plate materials as shown later, and then putting it in a mold and forming it into the final shape of the sealing member 16, or by putting a powder in a mold and compression molding it. It is molded by methods such as molding.

As shown in FIGS. 6 and 7, the core material 15 made of thin metal plate is
It has a large number of claws or small protrusions j5at on both sides, and is completely embedded in the refractory material layer 14 in an annular or cylindrical shape. When the small protrusion 15a is embedded,
It digs into the refractory material layer 14, strengthens the bond between the refractory material layer 14 and the core material 15, and increases the overall strength of the sealing member 15°.

In order to laminate the refractory material layer 14 using plate materials, as shown in FIGS.
A thin metal plate core material 15 with a small width and length is laminated, a rolled body is made by winding this into a cylindrical shape as shown in Fig. 6, and then it is obtained by compression molding in an annular mold. be able to.

In the sealing member of the present invention as shown in FIG. 5, the core material 15 is not exposed on the surface of the refractory material layer 14, and unlike known sealing members, it is not a metal mesh with built-in voids, so gas cannot enter or pass through. It has high sealing performance. Further, since the refractory material layer 14 mainly contains Vermierite if, and has heat resistance and high temperature expandability, the sealing performance at high temperatures is also good.

An example of a method for manufacturing a fireproof plate material mainly composed of vermiculite and a sole member using the vermiculite as shown in FIG. 8 will be described below.

No. 2 vermiculite 80 rapidly expanded at 1300℃
After immersing kq in 5 tons of water at 1/i: 16 hours to make it sufficiently moist, the water/vermiculite mixture was put into a fibrator and sheared at high speed, resulting in a dispersion in which the scaly vermiculite was dispersed in flocs. Get the liquid. While vigorously stirring this dispersion in a chest for 1 hour, add 10 kg of hemp bulb and 30 kq of talc to uniformly disperse it, and then dilute with 8 hk of a mixture of K NBR Rade, cus and vulcanizing agent twice as much water. Add gradually. When the latex is uniformly dispersed, add a small amount of 5% aluminum sulfate solution and mix the latex with vermiculite.
It was fixed evenly using hemp pulp O Tanoshiri T, and then it was made into paper using a paper making machine to a thickness of Q, 5 wz, and a density of 1000 kgl.
c- was formed into a sheet-like material, dried at 120° C. for 30 minutes, and made into a tape-like material with a width of 26 mm, varnished, and tossed to obtain a fireproof board material 16 as shown in FIG.

On the other hand, as a core material, a cold rolled steel plate with a thickness of 0.20 and a width of 21
It was cut into a strip of MM, and holes with a diameter of 2aφ were bored therein at a pitch of 3H, and nails were formed on both sides to obtain a core material 15 made of a thin metal plate as shown in FIG.

The above-described fireproof plate material 16 and thin metal plate core material 15 stacked one on top of the other as shown in FIG. 8 are wound around a round rod of a predetermined diameter and then pulled out to obtain a cylindrical rolled body.

This rolled body was placed in a mold and compression molded to obtain a sealing member 16f as shown in FIG. 5 having a spherical curved profile with an outer diameter of 59 cm, an inner diameter of 42.8 m, and an axial length of 1711 M.

When this seal member 16 was attached to the pipe joint shown in FIG. 1 and tested, the good measured values shown in Table 1 were obtained.

Table 1 and FIG. 10 show other embodiments of the present invention. The main body of the sealing member 17 of this embodiment is composed of a first refractory material layer 14 mainly composed of vermiculite, and the first refractory material layer 14 includes a core material 15 made of a thin metal plate with protrusions on both sides.
is embedded in at least one layer, and a second layer such as smooth graphite is embedded on the surface of the first refractory material layer 14.
A refractory material layer 18 is provided. If you do this,
The second refractory material layer has different characteristics from the first refractory material layer, and can reduce friction between the sole member 17 and other parts to maintain smooth contact at all times. For example, when the exhaust pipe 2 of the pipe joint shown in FIG. do not have. Also, even when a tensile force in the axial direction is applied, some slippage is allowed between the seal member 17 and the spherical flange 5, so the seal member 17 is able to maintain the contact between the flange 6 surface and the inner circumferential surface of the spherical flange 5. There is no risk of losing contact.

11 and 16 show an embodiment in which an elastic force is generated in the axial direction so that the sealing member does not separate from the inner peripheral surface of the spherical flange even when an axial tensile force is applied to the exhaust pipe 2. This is an example.

In the embodiment shown in FIG. 11, a shallow annular groove 19b is formed in the end face 19a of the sealing member that contacts the flange 6, and a leaf spring 20 having corrugated irregularities as shown in FIG. 12 is fitted into this annular groove 19b. has been done. The height of the unevenness of the leaf spring 20 is designed to be slightly larger than the depth of the annular groove 19b, and when the seal member 19 is pressed against the flange 3, the restoring force of the leaf spring 20 causes it to come into close contact with the spherical flange 5, and is pulled into the exhaust pipe 2. Even if force is applied, the adhesion will not be lost.

In the embodiment shown in FIG. 16, the sealing member 21 has annular portions 22, 23't aligned in the axial direction, and several recesses 22a, 23a are provided in opposing end faces of each of the annular portions 22, 23't. 22a and 23a have a pedestal-like part 22゜26
A coil spring 24 is housed therein which biases the two in the direction of separating them from each other.

When this seal member 21 is attached to the pipe joint shown in FIG. Since the force of the coil spring 24 acts so that the other annular portion 26 is pressed against the flange 3, the sealing member 21 and both flanges 6.5 do not lose their close contact.

The effects of this invention are listed below.

(1) Vermicelli is used as a refractory material that constitutes the sealing member. Since all the main ingredients of Lytra are used, when the pot is warm
Under such conditions, it will not become brittle and its sealing function will not decrease.

(ii) Since a thin metal plate core material is used that does not create any voids inside the seal member (and even more so if the core material is not exposed to the surface of the seal member), there is a risk of gas leaking through the seal member. There is no.

(iii) Providing a smooth layer of refractory material on the surface of the sealing member further reduces the risk of gas leakage since the sealing member makes and maintains close and smooth contact with the components of the joint.

(iv) If elastic force is applied in the axial direction, there is no risk of gas leakage even if a tensile force is applied in the axial direction.

As described above, according to the present invention, a sealing member suitable as a component of a pipe joint for a high-temperature pipe subjected to vibration is provided.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a known example of a pipe joint to which the seal member of the present invention is installed, FIGS. 2 to 4 are diagrams showing the manufacturing method and structure of the known seal member, and FIG. FIG. 6 is a plan view of a portion of the core material used in the seal member of the present invention, and FIG. 7 is a cross-sectional view taken along the line - ■ of FIG. 6. 8 is an explanatory diagram of an example of the manufacturing method of the present invention, FIG. 9 is a sectional view taken along the line IX-rX in FIG. 8,
FIG. 10 is a vertical cross-sectional view of a seal member according to a second embodiment of the present invention, FIG. 11 is a vertical cross-sectional view of a seal member according to a third embodiment of the present invention, and FIG. 12 is a sole member of FIG. 11. FIG. 16 is a perspective view of a leaf spring attached to the plate spring, and FIG. 16 is a longitudinal cross-sectional view of a sealing member according to a fourth embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Exhaust manifold pipe, 2... Exhaust pipe, 6... Flange, 4... Long hole, 5... Spherical flange, 6... Known seal member, 13, 17, 19.21 Seal member of the present invention, 14... Fireproof material layer, 15... Core material made of thin metal plate, 16... Fireproof plate material. Figure 1 Figure 3 Figure 6 Figure 7 Figure 5 \ 5a Part 8 (li5 Figure 9 v412 Figure 20 19b 19a Procedural amendment letter March 26, 1981 Commissioner of the Patent Office Shima 1) Haruki Tono 1, of the case Display 1982 Patent Application No. 008269 2
, Title of the invention Sole member 3 Relationship with the case of the person making the amendment Patent applicant address 1-26 Shiba Daimon-chome, Minato-ku, Tokyo Name NICHIAS Co., Ltd. Representative Takube Yamabe 4, attorney 6 Inventions that will increase due to the amendment Number 07 Subject of amendment Procedure supplement iT, I in the detailed explanation of the invention in the specification
(Spontaneous) February 2nd, 1980 Special Officer Kazuo Kimisugi Tono 1 Indication of $100.00 Patent Application No. 8269 of 1982 2 Title of Invention Seal member, '3 Supplement 11 Occupation Notice Relationship with Patent applicant Tokyo Minato] Meshiba Daimon 1-chome 1-26 Nichi
Ministry of Corporate Affairs and Representation
Part 4 Agent Tokyo Parts Co., Ltd. Minamishina 5-11150-306 No. 7 ``Detailed Description of the Invention'' column and 1. Brief Description of Drawings column of Specification Subject to Amendment 1, and the drawings. 8 Contents of correction (1) Measured values were obtained for the sealing member 13 on page 10, lines 12 to 14 of the specification. 1 is corrected as follows. "The sealing member 13 of this first embodiment was attached to a pipe joint shown in FIG. 1, and when tested by mounting it on the pipe joint testing apparatus shown in FIG. The test device shown in Fig. 14 simulates the movement of a pipe joint in a front-wheel drive vehicle. 141 is supporter 1
42, and the vibration indicated by the double-headed arrow V, which corresponds to the vibration generated from the front transverse engine, is artificially applied by the photographic test e1143 and the inertial weight 144. Further, the vibration number, vibration width, rocking force, etc. of the vibration tester 143 are measured by a control measuring device 145. Further, the pipe joint 141 is heated by a gas burner 146, and the temperature of the pipe portion at that time is measured by a thermocouple 147. The test items and measured values in Table 1 were tested by the following method. First, the axial load (180 klJ) of the compression characteristic is calculated from the shrinkage of the pressing spring 10 when the seal member 13 is tightened with the bolt 8 to the pipe joint shown in FIG. Compression of the sealing member 13 as a compression characteristic -(0,4+a+
++) shined from the distance between the spherical surface 7 lunge 5 and the flanone 3 at this time. The next swinging characteristic is determined by fixing the pipe joint 141 after measuring the compression property with a supporter 142 to the testing device shown in FIG. Evaluation was made by rotational moment (35 kQf-cm). Next, the gas seal characteristics are determined by first blindly sealing the pipe on the inertial weight 144 side, and then connecting the pipe on the gas burner 146 side to -
gf,,'cm' Measure the amount of air leakage from the seal member 13 when G is turned in 9 directions using a 1-noh meter, and confirm that the amount of air leakage before rocking is 800C/1lln. After that, remove the air piping, set the gas burner 146 as shown in the device in Figure 14, and connect the pipe fitting 1.
41 is heated and maintained at 500°C. While maintaining this temperature, operate the vibration tester 143 and test at 10Hz x 5
A vibration durability test is performed five times, with one vibration period of -50H2×55 minutes, for a total of 5 hours. After the last vibration endurance test,
Reconnect the air piping and reduce the internal pressure to 0.2 kgr/cm'
The amount of leakage after rocking from the seal member 13 by applying G
120cc/1n) was measured with a flow meter and defined as gas sealing characteristics. Next, the heat resistance characteristics were evaluated by disassembling the pipe joint after measuring the gas seal characteristics and determining the amount of change (0.07 am) in the outer diameter dimension (59, Oam) of the seal member before the test. ”(2)
Description 1, page 11, line 1 of the main text following Table 1, page 12, line 8, ``In Figure 10... there is no risk of loss of contact.'' is changed as follows. Correct to. 10 shows a sealing member 17 according to a second embodiment of the present invention. Hereinafter, the manufacturing method 7J of this sealing member 17 will be described in accordance with the first embodiment.
This will be explained with reference to FIG. A sheet-like fireproof plate material 16 mainly made of vermiculite obtained in the same manner as in the first embodiment is prepared. Next, scaly graphite 35%, molybdenum disulfide 2
Make a mixture of 8% asbestos, 5% asbestos HH, and 27% talc.
This mixture and rubber paste (containing 5% rubber) made by swelling NBR rubber in toluene are forcibly kneaded in a kneader for about 1 hour to form a clay-like material. This clay-like material was formed into a sheet using two rolling rolls, dried in an oven at 70°C for 15 minutes, and then slit into a 26 mm wide square shape to form a second sheet fireproof plate material 18-. Create. Above 2
Separate fireproof plates 16J'j and 18' and the same gold plate core material 15 used in the first embodiment are stacked as shown in Fig. 15, and then wrapped around a round bar with a predetermined diameter of 1. It is attached and then removed to obtain a cylindrical molded body. This molded body was put into a mold and compression molded to give C an outer diameter of 59n+mφ, an inner diameter of 42.8mmφ,
A sealing member 17 shown in FIG. 10 having a spherical curved contour with an axial length of 17 mm was obtained. When the sealing member 17 of the second embodiment was attached to the pipe joint shown in FIG. 1 in the same manner as the first embodiment and tested in the same way as described above, the good measured values shown in Table 2 were obtained. As is clear from Table 2, the seal member 1 of the second embodiment
7 has the overall characteristics of the seal member 1 of the first embodiment.
It is first in that it can maintain clean contact with the spherical 7 flange surface of the exhaust pipe 2 with little friction while maintaining the characteristics of 3.
It was found that this material was superior to the seal member 13 of the example. In addition, in the seal member 13 of the first embodiment, during the lOH2 low frequency vibration of the vibration durability test, the spherical surface 7 flange surface of the exhaust pipe 2 and the seal member 13 surface rub against each other, which commonly causes "squeal". A small fricative sound called "squeal" (a small sound that can be heard if you listen closely at a distance of about 11 m) occurred, but in the seal member 17 of the second embodiment, this fricative sound called "squeal" could be eliminated. Eliminating this "squeal" has a great effect on improving the quality of the vehicle in that it eliminates the perception of abnormal noise from the exhaust pipe swing joint located under the floor of the vehicle. Furthermore, in the sealing member 17 of the second embodiment, since the swing rotation moment of the pipe joint is reduced, the load on the support portion that fixes the exhaust pipe to the automobile floor is reduced, and the weight of the structure can be reduced. There is. (3) In the specification, page 12, line 141-i, page 13, line 15, ``In the embodiment shown in Fig. 11,...adhesion with both frames 3.5 is lost. "There is no such thing." is corrected as follows. The sealing member 19 of the third embodiment shown in FIG. 11 has a diameter of 55 mmφ
A shallow annular groove 19b with a diameter of 54.8 mm and a depth of 21 m was formed using a lathe, and a leaf spring (54.8 mm φ x 51.0
Ilφ×height 4mm) 20 is fitted. The height of the unevenness of the leaf spring 20 is designed to be slightly larger than the depth of the annular groove 19b, and when the seal member 19 is pressed against the flange 3, the restoring force of the leaf spring 20 causes it to come into close contact with the spherical flange 5, and the exhaust pipe 2 Even if a tensile force is applied, the adhesion will not be lost. This adhesion was confirmed by a test using the testing apparatus shown in FIG. As shown in the figure, the sealing member 19 and the spherical flange 5 are placed on the compression jig 161 of the Instronya universal testing machine, and the relationship between the load and strain is determined when an axial load of the exhaust pipe is applied in the direction of the arrow. , curve B in FIG. 17 was obtained. In the figure, curve A shows the results for the first embodiment shown in FIG. 5, and curve B shows the results for the second embodiment shown in FIG. As can be seen from FIG. 17, the first embodiment (curve A)
Also, the seal member of the second embodiment has a sudden 0.
If a tensile force of 4111II or more is applied, the spherical 7 langes 5 and the sealing member surface will separate and no sealing will be possible at all, whereas in the sealing member 19 of the third embodiment shown in FIG. A certain amount of load remains, and the spherical flange 5 and the sealing member surface are in contact and the seal is maintained. In the fourth embodiment of FIG. 13, the sealing member 21 has axially aligned annular portions 22,23 with a plurality of recesses 22a in each opposing end face. 23a (see FIG. 18) are provided facing each other, and a coil spring 24 is accommodated in the recesses 22a, 23a to bias the podium-like portions 22, 23 in the direction of separating them into n. To manufacture the sealing member 21 as shown in FIG.
Seal member 13 obtained in the example (see Fig. 5, inner diameter 42
．． 8Ill+nφ, outer diameter 59.0ml1lφ, thickness 17
mm) is divided into two parts using a high-speed cutter as shown in Fig. 13. Drilling machine so that each of these 42.8ml 1lφ circumference F is the center? '311φ x 2mm deep hole 22a,
23a in a position facing each other (the planar positions are 16 places divided by 22.5° as shown in Fig. 18). A coil spring 24 made of high-tensile spring steel with a length of 6 mm+ is accommodated. If the seal member 21 of the fourth embodiment is attached to the pipe joint shown in FIG. Since the force of the coil spring 24 acts so that the other annular portion 23 is pressed into contact with the seven flange 3, the sealing member 21 and both the seven flange 3 and 5 do not lose their close contact. Regarding the sealing member 21 of the fourth embodiment, the relationship between the load and strain shown in FIG. 17 was determined.
Even if a tensile force of 0.4 mm 1 s 1 is applied to the seal member 21 of the fourth embodiment, a fishing force of more than 1 ook gr still remains, and the spherical flange 5 and the seal member surface contact to maintain a good seal. I understand. Furthermore, the refractory material 14 of the fourth embodiment is a refractory material whose main component is vermiculite, and has the characteristics of an insulating material with extremely low thermal conductivity (λ-0,102kcal/
mh'c), the coil spring 24 installed therein is not sensitive to the influence of temperature from the exhaust pipe, and has the advantage of preventing deterioration of the spring constant and maintaining the elastic force of the sealing member. . (4) The following sentence is added between lines 10 and 11 of Section 15 of Specification I (brief description of drawings). Figure 14 is a front view schematically showing the pipe joint testing device, Figure 15 is an explanatory diagram of the manufacturing method of the seal portion 4117 in Figure 10, and Figure 16 is the axial load testing device for pipe joints. Fig. 17 shows the results of the axial load φ test using the apparatus shown in Fig. 16. Fig. 18 shows the position of the spring fitting recess of the seal member in Fig. (5) Next to Figure 13 of the drawings, Figure 14 of the amendment of this procedure.
Figures 1 to 18 are added. Fig. 16 Fig. 17 Compression amount (mm) Fig. 18

Claims (1)

[Scope of Claims] 1. Made of a refractory material layer containing vermiculite as a main component and at least one thin metal plate embedded in the refractory material layer and provided with a large number of claws or small protrusions on at least one surface. A sealing member comprising a core material. 2. A patent in which the human-resistance layer is cylindrical or annular, and the core material made of thin metal plate is embedded in the refractory layer so as not to protrude from both end faces of the refractory layer and the inner and outer cylindrical circumferential surfaces. A sealing member according to claim 1. 6. A fireproof material layer formed by winding several layers of band-shaped fireproof board material into a cylindrical or annular shape, and a large number of claws or small protrusions that bite into the fireproof board material on at least one surface, and the fireproof board material. The sealing member according to claim 1 or 2, comprising a cylindrical or annular thin metal plate core material formed by rolling together a thin metal plate having a width narrower than the width of the refractory plate material. 4. The sealing member according to claim 1, 2, or 3, the surface of which is coated with a second refractory material layer. 5. A sealing member consisting of a pair of annular parts arranged in the axial direction so that their end faces face each other, each of the annular parts being composed of a refractory material layer containing permiculite as a main component, and , a core material made of a thin metal plate having a large number of claws or small protrusions on at least one surface is embedded in the refractory material layer, and between the pair of annular parts, each of the core members is arranged in opposite directions. A sealing member according to any one of claims 1 to 4, further comprising a biasing spring member. 6 Made of a thin metal plate having a cylindrical or annular refractory layer made of a refractory material containing vermiculite as a main component, and embedded in the refractory layer and provided with a large number of claws or small protrusions on at least one surface. The sealing member according to any one of claims 1 to 4, comprising a core material and an elastic member attached to one end surface of the refractory material layer.