JP2019002593A - Heat insulation wall body for heating furnace - Google Patents

Abstract

To provide a heat insulation wall body for a heating furnace capable of absorbing dimensional change in an inner cylinder due to thermal expansion, while suppressing the relative positional deviation in the longitudinal direction of the inner cylinder and an outer cylinder.SOLUTION: A heat insulation wall body 1 for a heating furnace of the present invention comprises: a cylindrical and bottomed outer cylinder 2 having an annular flange 21 extended inside along an opening face 2b; a cylindrical and bottomed inner cylinder 3 disposed inside the outer cylinder 2 and having an annular flange 31 extended outside along an opening face 3b; and an annular elastic seal material 5 held between the flange 21 and the flange 31 outside the outer cylinder 2 and sealing a decompressed space formed with the outer cylinder 2 and the inner cylinder 3 from ambient air. The elastic seal material 5 has an annular elastic body 51 and multiple fiber bodies 52 radially oriented in the radial direction of the annular elastic body inside the elastic body 51, and the multiple fiber bodies 52 are arranged in the thickness direction of the annular elastic body 51.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat insulating wall for a heating furnace.

  An inner cylinder having a bottom is disposed inside an outer cylinder that also has a bottom, the inner cylinder and the outer cylinder are sealed on the opening side, and a decompressed space is formed in the gap between the inner cylinder and the outer cylinder. Vacuum insulated containers are known. Such a vacuum heat insulating container can be used as a heat insulating wall for a heating furnace, for example.

  Patent Document 1 discloses a vacuum heat insulating container provided with a metal inner cylinder and a metal outer cylinder, in which the inner cylinder and the outer cylinder are joined by welding on the opening side.

JP 2011-219125 A

  When using a vacuum heat insulating container provided with a metal inner cylinder and an outer cylinder as disclosed in Patent Document 1 under conditions where the temperature of the inner cylinder such as a heating furnace varies greatly compared to the temperature of the outer cylinder Due to thermal expansion, the dimensions of the inner cylinder vary greatly compared to the dimensions of the outer cylinder. For this reason, a shear stress acts on the joint portion between the inner tube and the outer tube, and the joint portion between the inner tube and the outer tube may be damaged. Moreover, when the outer cylinder and the inner cylinder are directly joined, the heat of the inner cylinder leaks to the outer cylinder due to heat conduction, and it is difficult to sufficiently enhance the heat insulation. In order to solve such a problem, when a vacuum heat insulating container is used as a heat insulating wall for a heating furnace, an annular elastic body may be used as a sealing material.

  However, when an annular elastic body is used as a sealing material, the following problems occur. The problem of the present invention will be described below with reference to FIGS.

  FIG. 9 is a schematic diagram illustrating a configuration of a conventional heat insulating wall body 100 for a heating furnace. As shown in FIG. 9, the heat insulating wall 100 for a heating furnace includes an outer cylinder 102, an inner cylinder 103, an elastic seal material 105, a port 106, a vacuum pump 107, a space 108, a motor 191, a coupling 194, and a fan 197. Prepare.

  The outer cylinder 102 and the inner cylinder 103 are cylindrical and have a bottom. The inner cylinder 103 is arranged inside the outer cylinder 102, and the opening surface 103 b of the inner cylinder 103 is arranged outside the opening surface 102 b of the outer cylinder 102. A flange 121 is provided at the opening of the outer cylinder 102. A flange 131 is provided at the opening of the inner cylinder 103. An elastic sealing material 105 is provided between the flange 121 and the flange 131. Thereby, the space formed by the outer cylinder 102 and the inner cylinder 103 is sealed.

  When the fan 197 is provided inside the heat insulating wall body 100 for heating furnace as in the heat insulating wall body 100 for heating furnace shown in FIG. 9, the motor 191 is provided outside the outer cylinder 102 and the fan inside the inner cylinder 103 is provided. 197 is provided, and the power of the motor 191 is transmitted to the fan 197 via the motor shaft 193, the coupling 194, and the fan shaft 195. At this time, the motor 191 and the motor shaft 193 are fixed to a bracket 192 attached to the outer cylinder 102, and the fan shaft 195 and the fan 197 are fixed to a bracket 196 attached to the inner cylinder 103.

  A space 108 formed by the outer cylinder 102, the inner cylinder 103, and the elastic seal material 105 is decompressed by being evacuated through a port 106 using a vacuum pump 107. When the space 108 is in a depressurized state, as shown in FIG. 10, a force that approaches the outer cylinder 102 and the inner cylinder 103 in the x-axis direction (longitudinal direction) acts, thereby compressing the elastic sealing material 105. .

  As described above, when the elastic sealing material 105 is compressed by evacuation, the relative positions of the outer cylinder 102 and the inner cylinder 103 in the longitudinal direction are shifted. Therefore, as shown in FIG. 10, the motor shaft 193 and the fan The shaft 195 is greatly deviated from that before evacuation. For this reason, noise, vibration, and the like are generated due to the deviation of the shaft, and the driving state of the fan 197 may become unstable.

  Therefore, if the elastic sealing material 105 is made of a material that is not easily deformed by stress (a material having a high elastic modulus and high rigidity), it is possible to suppress compression of the elastic sealing material 105 due to evacuation. However, when the inner cylinder 103 reaches a high temperature, the inner cylinder 103 is thermally expanded, and accordingly, the flange 131 of the inner cylinder 103 spreads outward, and shear stress (see F2 and F3 in FIG. 7) acts on the elastic sealing material 105. . For this reason, when the elastic seal material 105 is made of a material that is difficult to deform, the elastic seal material 105 is not sufficiently deformed, so that the displacement of the inner cylinder 103 relative to the outer cylinder 102 cannot be absorbed by the elastic seal material 105. Cannot secure a sufficient sealing performance when the inner cylinder 103 is thermally expanded.

  The present invention has been made in view of the above background, and is capable of absorbing the dimensional change of the inner cylinder due to thermal expansion while suppressing the relative displacement between the inner cylinder and the outer cylinder in the longitudinal direction. An object is to provide a heat insulating wall for a furnace.

  One aspect of the present invention for achieving the above object is a heat insulating wall for a heating furnace, and includes a cylindrical and bottomed outer cylinder having an annular first flange extending inward along a first opening surface. A cylindrical and bottomed inner cylinder disposed inside the outer cylinder and extending outward along a second opening surface; and the first flange and the first outer cylinder outside the outer cylinder And an annular elastic sealing material that is sandwiched between two flanges and seals the decompressed space formed by the outer cylinder and the inner cylinder from the outside air. The elastic sealing material has an annular elastic body and a plurality of fiber bodies radially oriented in the radial direction of the annular elastic body inside the annular elastic body, and the plurality of fiber bodies are annular. It arrange | positions in the thickness direction of an elastic body.

  In the heat insulating wall for a heating furnace according to the present invention, an elastic sealing material using an annular elastic body and a plurality of fiber bodies radially oriented in the radial direction of the annular elastic body inside the annular elastic body. Is configured. When subjected to a compressive stress, the fibrous body contained in the elastic sealing material works to suppress deformation of the annular elastic body. Therefore, the relative displacement in the longitudinal direction between the inner cylinder and the outer cylinder (that is, the displacement due to the compression of the elastic seal material) can be suppressed. On the other hand, when the inner cylinder is displaced by thermal expansion, a dimensional difference is generated between the outer cylinder and the inner cylinder, and the elastic sealing material receives shear stress. When subjected to the shear stress, the fiber body contained in the elastic sealing material is displaced together with the annular elastic body, so that the elastic sealing material can absorb the dimensional change of the inner cylinder due to thermal expansion. Therefore, it is possible to provide a heat insulating wall for a heating furnace that can absorb a change in the size of the inner cylinder due to thermal expansion while suppressing a relative positional shift in the longitudinal direction between the inner cylinder and the outer cylinder.

  ADVANTAGE OF THE INVENTION According to this invention, the heat insulation wall body for heating furnaces which can absorb the dimensional change of the inner cylinder by thermal expansion is suppressed, suppressing the relative position shift in the longitudinal direction of an inner cylinder and an outer cylinder. be able to.

It is a schematic diagram which shows the heat insulation wall body for heating furnaces concerning embodiment. It is sectional drawing which follows the II-II line | wire of FIG. It is sectional drawing which follows the II-II line | wire of FIG. 1 of an elastic sealing material. It is the enlarged view to which a part of elastic sealing material was expanded. It is a schematic diagram which shows the state after evacuation of the heat insulation wall body for heating furnaces concerning embodiment. It is an enlarged view which shows the state in which the elastic sealing material is receiving the compressive stress. It is a schematic diagram which shows the state in which the inner cylinder is thermally expanding in the heat insulation wall body for heating furnaces concerning embodiment. It is an enlarged view which shows the state in which the elastic sealing material is receiving the shear stress. It is a schematic diagram which shows the conventional heat insulation wall for heating furnaces. It is a schematic diagram which shows the state after evacuation of the conventional heat insulation wall for heating furnaces.

Embodiments of the present invention will be described below with reference to the drawings.
Drawing 1 is a mimetic diagram explaining the composition of heat insulation wall 1 for heating furnaces concerning an embodiment. As shown in FIG. 1, the heat insulating wall 1 for a heating furnace includes an outer cylinder 2, an inner cylinder 3, an elastic seal material 5, a port 6, a vacuum pump 7, and a space 8. FIG. 2 is a sectional view of the heat insulating wall 1 for a heating furnace along the line II-II in FIG. In the cross-sectional view of FIG. 2, the flange 21, the port 6, and the vacuum pump 7 are also illustrated.

  The outer cylinder 2 and the inner cylinder 3 are cylindrical and have a bottom. More specifically, the outer cylinder 2 is a cylindrical structure extending in the x-axis direction (longitudinal direction), and has a bottom on the minus side in the x-axis direction and an opening surface 2b on the plus side in the x-axis direction. The opening surface 2b (first opening surface) of the outer tube 2 is a surface parallel to the yz surface (in other words, a surface perpendicular to the longitudinal direction of the outer tube 2).

  The inner cylinder 3 is a cylindrical structure extending in the x-axis direction (longitudinal direction), and has a bottom on the minus side in the x-axis direction and an opening surface 3b on the plus side in the x-axis direction. The opening surface 3b (second opening surface) of the inner tube 3 is a surface parallel to the yz surface (in other words, a surface perpendicular to the longitudinal direction of the inner tube 3).

  The inner cylinder 3 is disposed on the inner side of the outer cylinder 2, and the opening surface 3b of the inner cylinder 3 is disposed on the outer side of the outer cylinder 2 (that is, on the positive side in the x-axis direction with respect to the opening surface 2b of the outer cylinder 2). Has been. The outside of the outer cylinder 2 is outside air, and the inner side of the inner cylinder 3 is an accommodation space 4 (see FIG. 2). The outer cylinder 2 and the inner cylinder 3 can be comprised using stainless steel and steel, for example. The materials constituting the outer cylinder 2 and the inner cylinder 3 may be the same or different.

  A flange 21 (first flange) is provided at the opening (the end on the positive side in the x-axis direction) of the outer cylinder 2. The flange 21 has an annular shape (see FIG. 2) and extends inward along the opening surface 2b from the end portion of the outer cylinder 2 on the opening portion side. In addition, a flange 31 (second flange) is provided at the opening (the end on the positive side in the x-axis direction) of the inner cylinder 3. The flange 31 is annular and extends outward from the end of the inner cylinder 3 on the opening side along the opening surface 3b. In order to ensure sufficient heat insulation in the annular heat insulating wall 1 for the heating furnace, it is desirable that the outer cylinder 2 and the inner cylinder 3 are designed to have dimensions that do not directly contact each other including the flange portion. For example, the inner diameter 2c of the flange 21 is desirably larger than the outer diameter 3c of the inner cylinder 3 on the opening surface 2b.

  An elastic sealing material 5 is sandwiched between the flange 21 and the flange 31. The elastic sealing material 5 is annular (see FIG. 2) and seals the space formed by the outer cylinder 2 and the inner cylinder 3 from the outside air. That is, the elastic sealing material 5 seals the space formed by the outer cylinder 2 and the inner cylinder 3 by the frictional force generated between the flange 21 and the flange 31 and the elastic sealing material 5. The space 8 formed by the outer cylinder 2, the inner cylinder 3, and the elastic sealing material 5 is decompressed by being decompressed by the vacuum pump 7 through the port 6.

  FIG. 3 is a cross-sectional view of the elastic sealing material 5 taken along line II-II in FIG. FIG. 4 is an enlarged view in which a part of the elastic sealing material 5 in FIG. 1 is enlarged.

  As shown in FIG. 3, the elastic sealing material 5 includes an annular elastic body 51 and a plurality of fiber bodies 52. The plurality of fiber bodies 52 are provided inside the elastic body 51 and are radially oriented from the inside to the outside. As shown in FIG. 4, the fiber body 52 is arranged inside the elastic body 51 so that a plurality of fiber bodies 52 arranged in the thickness direction (longitudinal direction) of the elastic body 51 are substantially parallel to the yz plane. ing.

  The elastic body 51 is made of a material (a material that easily deforms) having a lower thermal conductivity, a larger elastic limit, and a lower elastic modulus than the materials constituting the outer cylinder 2 and the inner cylinder 3. For example, the elastic body 51 can be configured using silicone rubber or fluororubber. The fiber body 52 is preferably made of a material having a high elastic modulus (a material that hardly deforms, a material that has a high rigidity), and can be made of glass fiber or carbon fiber, for example. Furthermore, it is preferable that the material constituting the fiber body 52 is processed so that the frictional force generated between the fiber body 52 and the elastic body 51 is increased, and the adhesiveness with the elastic body 51 is high. Since a frictional force is generated between the elastic body 51 and the fiber body 52, when the elastic sealing material 5 is deformed by receiving a force from the outside, the elastic body 51 and the fiber body 52 are adapted to each other's deformation and movement. Transform and move.

  For example, the elastic sealing material 5 can be formed by placing a plurality of fiber bodies in an annular mold and then pouring liquid rubber into the mold to solidify.

  The heat insulating wall for a heating furnace according to the present embodiment is used as a heating furnace by providing a heater in the accommodation space 4, for example. For this reason, the accommodation space 4 becomes high temperature, and the inner cylinder 3 also becomes a high temperature state. However, in the heat insulating wall 1 for the heating furnace according to the present embodiment, the elastic sealing material 5 having a low thermal conductivity is provided between the outer cylinder 2 and the inner cylinder 3. Therefore, since the inner cylinder 3 is in contact with the outer cylinder 2 only through the elastic sealing material 5 having a low thermal conductivity, and the space 8 is in a decompressed state, the amount of heat transferred from the inner cylinder 3 to the outer cylinder 2 is This is less than a vacuum heat insulating container in which the inner cylinder 3 and the outer cylinder 2 are directly joined. With such a configuration, the heat insulating wall for a heating furnace according to the present embodiment can maintain sufficient heat insulating properties.

  Next, the behavior when the heat insulating wall for a heating furnace according to the present embodiment is evacuated will be described with reference to FIGS. FIG. 5 is a schematic view showing a state after evacuation of the heat insulating wall for a heating furnace according to the present embodiment. FIG. 6 is an enlarged view showing a state where the elastic sealing material is compressed.

  As shown in FIG. 5, when the space 8 is evacuated using the vacuum pump 7, the space 8 is decompressed. When the space 8 is in a depressurized state in this way, a force is applied to the outer cylinder 2 and the inner cylinder 3 so as to approach each other in the x-axis direction (longitudinal direction). Thereby, the elastic sealing material 5 is compressed by receiving the compressive stress F1 acting in the x-axis direction. Thus, when the compressive stress F1 acts on the elastic sealing material 5, as shown in FIG. 6, the elastic body 51 tends to be deformed so as to extend parallel to the yz plane. On the other hand, since the fiber body 52 is made of a material that does not easily expand and contract, it cannot extend in the direction parallel to the yx plane in accordance with the elastic body 51. Here, since a frictional force is acting between the elastic body 51 and the fiber body 52, deformation in the direction parallel to the yz plane of the elastic body 51 can be suppressed by the fiber body 52. Therefore, when the elastic sealing material 5 is compressed by evacuation, the relative displacement in the longitudinal direction between the outer cylinder 2 and the inner cylinder 3 is suppressed.

  Next, the behavior when the inner cylinder of the heat insulating wall body for a heating furnace according to the present embodiment is thermally expanded will be described with reference to FIGS.

  As shown in FIG. 7, for example, when the accommodation space 4 is heated using a heater (not shown) provided in the accommodation space 4, the heat of the accommodation space 4 is transmitted to the inner cylinder 3, and the inner cylinder 3 is heated. Inflate. In particular, the flange 31 of the inner cylinder 3 expands radially outward by thermal expansion. In FIG. 7, the state of the inner cylinder 3 before heating is indicated by a broken line. On the other hand, since the outer cylinder 2 is in contact with the inner cylinder 3 through the elastic sealing material 5, the heat of the inner cylinder 3 is hardly transmitted to the outer cylinder 2. Therefore, even if the inner cylinder 3 is thermally expanded, the outer cylinder 2 and the flange 21 are hardly thermally expanded. For this reason, when the flange 31 spreads radially outward due to the thermal expansion of the inner cylinder 3, the frictional force generated between the flange 31 and the elastic seal material 5 causes a radially outward shear stress F <b> 3 on the elastic seal material 5. Work as. Further, the frictional force generated between the flange 21 and the elastic sealing material 5 acts on the elastic sealing material 5 as a radially inward shearing stress F2. When the shear stresses F2 and F3 are thus received, the elastic sealing material 5 undergoes shear deformation according to the shear stresses F2 and F3.

  That is, when subjected to the shear stress F2 and the shear stress F3, the elastic body 51 undergoes shear deformation outward in the radial direction as shown in FIG. At this time, the fiber body 52 also moves with the shear deformation of the elastic body 51. In other words, when subjected to the shear stress F2 and the shear stress F3, both the elastic body 51 and the fiber body 52 are displaced in a direction parallel to the yz plane. Therefore, unlike the case where the elastic sealing material 5 receives compressive stress, the fibrous body 52 does not exert a force on the elastic body 51 in the direction of suppressing deformation. Therefore, the elastic sealing material 5 can sufficiently shear and deform when the inner cylinder 3 is thermally expanded, and can absorb the displacement of the inner cylinder 3 with respect to the outer cylinder 2. Thereby, sufficient sealing performance can be ensured.

  By the invention according to the present embodiment described above, a heating furnace capable of absorbing the dimensional change of the inner cylinder due to thermal expansion while suppressing the relative displacement in the longitudinal direction between the inner cylinder and the outer cylinder. A heat insulating wall can be provided.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the case where the present invention is applied to the heat insulating wall for a heating furnace in which the accommodation space 4 is heated has been described above. However, the present invention can be applied to any technique as long as it is an insulated container that maintains the temperature of the accommodation space 4. For example, the present invention can be applied to a heat insulating wall body or the like in which the accommodation space 4 is cooled.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited only to the configuration of the above embodiment, and within the scope of the invention of the claims of the present application. It goes without saying that various modifications, corrections, and combinations that can be made by those skilled in the art are included.

DESCRIPTION OF SYMBOLS 1,100 Heat insulation wall for heating furnaces 2,102 Outer cylinder 21, 121 Flange 2b, 102b Opening surface 2c Inner diameter 3, 103 Inner cylinder 31, 131 Flange 3b, 103b Opening surface 3c Outer diameter 4 Housing space 5, 105 Elastic seal Material 51 Elastic body 52 Fiber body 6, 106 Port 7, 107 Vacuum pump 8, 108 Space 191 Motor 192, 196 Bracket 193 Motor shaft 194 Coupling 195 Fan shaft 197 Fan

Claims (1)

A cylindrical and bottomed outer cylinder having an annular first flange extending inward along the first opening surface;
A cylindrical and bottomed inner cylinder disposed inside the outer cylinder and having an annular second flange extending outward along a second opening surface;
An annular elastic sealing material that is sandwiched between the first flange and the second flange outside the outer cylinder and seals a decompressed space formed by the outer cylinder and the inner cylinder from the outside air. ,
The elastic sealing material has an annular elastic body and a plurality of fiber bodies radially oriented in the radial direction of the annular elastic body inside the annular elastic body, and the plurality of fiber bodies are annular elastic. Arranged in the thickness direction of the body,
Heat insulation wall for heating furnace.

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