JPS6238235Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a method for fixing and holding a heat-resistant lining, preferably made of ceramic fiber (hereinafter abbreviated as "CF"), to the inner wall of a high-temperature industrial furnace. It concerns a fixation device.

BACKGROUND OF THE INVENTION In recent years, in high-temperature industrial furnaces, the inner walls of the furnace have been lined with CF lining in order to improve the thermal efficiency of the furnace, save fuel, and improve productivity.

To line the CF lining, a stud is installed on the inner wall of the furnace so as to protrude almost perpendicularly to the wall surface and penetrates through the ceramic fiber lining that covers this wall surface, and a stud is installed at the free end of this stud. The entire inner wall is lined using a plurality of fixing devices each comprising a retainer that is locked to the stud and holds the lining, having a locking portion that engages with the locking portion.

Studs made of alloy or ceramic are used as such studs.

Problems that the invention aims to solve Ceramic studs can withstand high temperatures of over 1200℃, but they are extremely brittle at room temperature, so if the installation is not done carefully and carefully, the studs will break. Lining is difficult because there is a risk of damage. Ceramic studs are also expensive.

On the other hand, studs made of alloys may bend, stretch, break, or break due to thermal stress, oxidation, etc. due to high temperatures, and the practical limit for the furnace temperature is approximately 1200°C, but they cannot be used at room temperature. Because it is easy to work with and relatively inexpensive, it is often used in areas where the temperature is below 1180℃. Special alloys made of the same material can be used at high temperatures of up to 1800°C when used as heating elements, but 1200°C is generally considered to be the limit when used as structural materials (studs). However, this is different if it is frequently replaced and used). Some types of super heat-resistant alloys can withstand temperatures of over 1200°C, but like ceramics, they have the disadvantage of being extremely brittle at room temperature and being expensive.

Therefore, when the temperature inside the furnace reaches a high temperature of 1300℃ or higher, the first stud member made of an alloy with good workability is used in the bottom layer of the CF lining where the temperature is kept low by the CF lining, and the first stud member made of an alloy with good workability is used. When a measure is taken to add a second stud member to penetrate the surface layer of the CF lining by screwing together the female thread formed at the end of the second stud member made of ceramic or super heat-resistant alloy with the male thread at the tip. There is also.

However, this measure also involves forming an internally threaded screw hole at the end of the fragile second stud member, which poses problems in terms of the strength of the thread itself and the threaded hole portion, as well as the durability of the joint with the alloy stud. can be,
Another drawback is that the screwing process takes time.

Therefore, the purpose of this invention is to fix a ceramic fiber lining that can be easily lined without damaging the studs, and that can withstand use in industrial furnaces that reach temperatures of over 1200°C. You are on your way to getting the equipment.

Means for Solving the Problems In order to achieve the above-mentioned object, the fixing device for ceramic fiber lining according to the present invention includes a first stud member whose one end is fixed to the furnace wall and which projects almost perpendicularly to the wall surface. a cylindrical sleeve member to be attached to the free end of the first stud member; a washer member disposed at the end of the sleeve member to be attached to the free end of the first stud member; and one end fitted into the sleeve member. The second stud member is connected to the sleeve member and has a retainer at the other end that abuts against the surface of the ceramic fiber lining.

Function According to the present invention, the primary lining is brought into contact with the furnace wall on which the first stud member is protruded, and the sleeve member is connected to the free end of the first stud member via the washer member. do. Thereafter, a subsequent lining is placed over the primary lining, and a second stud member is inserted through the subsequent lining and connected to the sleeve member. Next, the subsequent lining is fixed by a retainer placed on the free end side of the second stud member.

Embodiments Next, preferred embodiments of the present invention will be described with reference to the drawings.

In the illustrated embodiment, the first stud member is a round bar made of alloy, and one end of the alloy stud 1 is fixed to the furnace wall W by any method (for example, by welding). The primary CF lining is brought into contact with this furnace wall, and the sleeve member 3 connected to the free end of the alloy stud 1 is connected via the washer member 1a that abuts against the surface of the primary CF lining. Next, do the lining. At the other end of the alloy stud 1,
At least one radially outwardly projecting key projection 2 is provided. In a preferred embodiment, a pair of key protrusions 2 are provided which project at diametrically opposed positions. The sleeve member 3 has an end wall at one end and an open cylindrical shape at the other end, and the end wall has a central opening 3b for inserting an alloy stud with a keyway hole 3a cut out through which the key protrusion 2 can pass. (See Figure 2). With the key protrusion and keyway hole aligned, the end of the alloy stud 1 is inserted into the sleeve member through the central opening 3b and rotated approximately 90 degrees to be interconnected. Since the sleeve member is constantly pulled inward of the furnace (in the direction toward the surface F of the CF lining) due to the restoring force of the compressed CF lining, the key protrusion 2 engages with the end wall and locks with the alloy stud. maintained. The connection between the end wall of the sleeve member and the end of the alloy stud can also be achieved by a screw connection. The sleeve member can be made of an alloy, an alloy coated with ceramic, or made of ceramic.

In the illustrated embodiment, the washer member 1a interposed when the sleeve member is connected to the alloy stud is integrally provided as a flange portion with the sleeve member, but it may be a separate member.

The alloy stud 1 shall have a length that extends within the CF lining to the point where its temperature limit is expected to occur. A second stud member 4 of ultra-high temperature resistant material, preferably a ceramic stud 4, is connected to the sleeve member 3, having a length that penetrates the part of the CF lining which is above the critical temperature of the alloy stud. The second stud member may also be made of a superalloy.

The inner surface of the sleeve member 3 is provided with a key protrusion 5 that projects radially inward, and the circumferential surface of the cylindrical end of the ceramic stud 4 that fits into the sleeve member is provided with a key guide groove 6 that corresponds to the key protrusion 5. (See Figure 3). The key guide groove 6 is constituted by a longitudinal guide portion 6a extending from one end of the ceramic stud toward the other end, and a transverse guide portion 6b extending laterally from the longitudinal guide portion.

In the illustrated embodiment, the longitudinal guide portion 6a of the key guide groove extends in the longitudinal direction with a width corresponding to the width of the key protrusion 5, and the lateral guide portion 6b extends the length (vertical dimension) of the key protrusion 5. a first transverse portion extending laterally with a width corresponding to the width of the key projection 5 and running slightly backwards towards the beginning of the longitudinal guide with a width again corresponding to the width of the key projection 5; There is a retrograde portion and a second lateral portion further extending laterally with a width corresponding to the length of the key projection.

In the illustrated embodiment, the key protrusion 5 has a rectangular cross section with a small width in the horizontal direction and a large length in the vertical direction, resulting in a key guide groove having the shape shown in the figure.
Of course, the present invention is not limited to this, and the key guide groove may have various shapes depending on the shape of the key protrusion 5. Further, the lateral guide portion 6b may not be in the shape of a crank as shown in the figure, but may simply extend linearly in the lateral direction. However, if it is shaped like a crank, the lock will be more reliable.

A retainer 7 is provided at the other end of the ceramic stud 4, that is, the end exposed from the surface F of the CF lining (see FIG. 4). In the illustrated embodiment, the retainer 7 is made of a ceramic washer, and a central opening 7b having keyway holes 7a diametrically opposed to each other and extending radially outward is formed in the center thereof;
The locking end of the ceramic stud 4 is provided with a pair of key protrusions 4a that are diametrically opposed to each other and project radially outward. but,
The retainer can be of various known types and can even be integral to the ceramic stud.

The first stud is attached to the wall W to which one end of the alloy stud 1 is fixed.
The next CF lining is abutted and the alloy stud is passed through this first CF lining. The sleeve member 3 is connected to the free end of the alloy stud 1 as described above, and the primary CF lining is fixed by the flange portion 1a as a washer provided on the sleeve member 3, thereby completing the primary lining. Next, the second CF lining is brought into contact with this first CF lining, and this sleeve member 3 is attached to the second CF lining.
Penetrate the lining. In this case, the secondary CF lining may be temporarily fixed by connecting a washer member around the end of the sleeve member on the side where the ceramic stud is inserted. This second C.
F. Before or after abutting the tertiary CF lining on the lining, guide and insert the end of the ceramic stud 4 with the key guide groove formed into the open end of the sleeve member 3 as described above, and connect the sleeve member 3 and the ceramic stud 4. The studs 4 are connected and the ceramic studs 4 are passed through the tertiary CF lining.

When guiding and inserting the ceramic stud into the sleeve member, the key guide groove 6 of the ceramic stud 4 is fitted into the key protrusion 5 of the sleeve member 3, the stud is pushed in the vertical direction by the longitudinal guide part, and rotated and slightly rotated by the lateral guide part. When it is pulled back and then further rotated, the key protrusion 5 and the end point of the key guide groove 6 engage with each other due to the restoring force of the CF lining compressed for connection, and the connection between the sleeve member and the ceramic stud is maintained in a locked state. be done. lastly
The ceramic washer 7 is pressed onto the surface F of the CF lining by the third layer of the ceramic stud 4.
The CF lining is fixedly held on the furnace wall by locking onto the exposed part of the CF lining.

The connection between the sleeve member 3 and the ceramic stud 4 is not limited to the connection between the key protrusion provided on the sleeve member 3 and the key guide groove provided on the ceramic stud as in the illustrated embodiment, but may be achieved by other methods, such as the sleeve member. This can be done by screwing together the female threaded part formed on the inner surface of the sleeve member and the male threaded part formed on the circumferential surface of the ceramic stud, but it is preferable to screw the female threaded part formed on the inner surface of the sleeve member into the male threaded part formed on the circumferential surface of the ceramic stud. The insertion opening with the formed keyway hole engages with the key protrusion provided on the circumferential surface of the ceramic stud, and the key guide groove provided on the circumferential wall of the sleeve member and the key protrusion provided on the circumferential surface of the ceramic stud engage with each other. It can also be done by multiplication. An adhesive can also be used to make the connection even more reliable when connecting by these methods.

Effects According to the present invention, an inexpensive alloy stud with low heat resistance but good workability is used as the first stud member in the bottom layer of the CF lining near the furnace wall, where the temperature is maintained at a low temperature by the CF lining. Studs made of expensive ultra-heat-resistant materials, such as ceramic studs, can be used as the second stud member only in the surface layer of the CF lining, where the temperature is high (for example, 1200°C or more, which exceeds the limit temperature of alloy studs). Studs made of ultra-high-temperature materials with high strength but low mechanical strength can be shorter and therefore less likely to break and cost less, as well as threads and screws that significantly reduce strength. By simply providing a key guide groove or a key protrusion on the circumferential surface without providing a hole in the stud made of super heat-resistant material, the stud can be easily, durable, and securely connected to the first stud member through the sleeve member. It becomes possible.

Further, according to the present invention, the lining can be performed in stages by performing the subsequent lining after the first lining by using the primary stud member, the sleeve member, and the washer member disposed at the end of the sleeve member. Therefore, in the case of a furnace that must be lined with a lining layer of considerable thickness, a dynamic ceiling has a great advantage in that it makes work easier.

Furthermore, in the illustrated embodiment, the successive connections of the alloy stud, sleeve member, ceramic stud, and ceramic washer can all be made with one touch, resulting in excellent workability.

[Brief explanation of the drawing]

1 is a schematic cross-sectional view showing the CF lining fixed state of a preferred embodiment of the ceramic fiber lining fixing device of the present invention; FIG. 2 is an end view of the sleeve portion of the alloy stud of the embodiment of FIG. 1; 3 is an enlarged side view of the ceramic stud of the embodiment of FIG. 1, and FIG. 4 is a plan view of the ceramic stud of the embodiment of FIG. 1. 1... Alloy stud (first stud member), 1
a...Washer member (flange part), 2...Key protrusion, 3...Sleeve member, 3a...Keyway hole, 3
b... Center opening, 4... Ceramic stud (second stud member), 4a... Key protrusion of ceramic stud, 5... Key protrusion of sleeve portion, 6...
. . . Key guide groove of ceramic stud, 6 a . . . Vertical guide portion, 6 b . . . Lateral guide portion, 7 .

Claims (1)

[Claims for Utility Model Registration] 1. A first stud member whose one end is fixed to a furnace wall and protrudes substantially perpendicularly to the wall surface;
A cylindrical sleeve member attached to the free end of the stud member, a washer member disposed at the end of the sleeve member that is attached to the free end of the first stud member, and one end of the sleeve member is fitted into the sleeve member. A fixing device for a ceramic fiber lining, comprising a second stud member connected to the member and having a retainer disposed at the other end thereof abutting against the surface of the ceramic fiber lining. 2. The fixing device for ceramic fiber lining according to claim 1, wherein the washer member is integrally formed with the sleeve member. 3. A fixing device for a ceramic fiber lining according to claim 1 or 2, wherein the first stud member and the sleeve member are made of an alloy, and the second stud member is made of a ceramic. 4. The fixing device for ceramic fiber lining according to claim 3, wherein the first stud member and/or the sleeve member are coated with ceramic. 5 Utility model registration claim 1 or 2 characterized in that the sleeve member is made of ceramic
A fixing device for the ceramic fiber lining described in 2. 6. The insertion opening with a keyway hole formed in the end wall of the sleeve member on the side where the ceramic stud is inserted is engaged with the key protrusion provided on the circumferential surface of one end of the ceramic stud, so that the sleeve member and the ceramic stud are inserted. A fixing device for a ceramic fiber lining according to any one of claims 1 to 4 of the claims 1 to 4, characterized in that the fixing device is connected to a stud. 7 Connecting the sleeve member and the second stud member by engaging the key guide slot formed in the peripheral wall of the sleeve member and the key protrusion provided on the peripheral surface of one end of the second stud member, and connecting the key guide groove hole formed in the peripheral wall of the sleeve member The guide slot includes a longitudinal guide portion extending from an edge on the side into which the second stud member is inserted toward an end on the side connected to the first stud member, and a longitudinal guide portion extending laterally from the end point of the longitudinal guide portion. A fixing device for a ceramic fiber lining according to any one of claims 1 to 4 of the claims 1 to 4, characterized in that the device comprises a lateral guide portion. 8. Connecting the sleeve member and the second stud member by engaging a key protrusion provided on the inner surface of the sleeve member and a key guide groove formed on the circumferential surface of one end of the second stud member, and The key guide groove of the surface is characterized by comprising a vertical guide part that starts from the one end and extends toward the other end, and a horizontal guide part that extends laterally from the end point of the vertical guide part. A fixing device for ceramic fiber lining according to any one of claims 1 to 4 of the utility model registration claims.