JP2009127683A - Heat resistant vacuum heat insulation material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain a heat insulation property of a heating chamber by composing an inner side face of an external packaging by a material with a small coefficient of linear expansion in comparison to an outer side face, and to prevent formation of a gap opened between an outer face of a wall surface and an inner side face of a heat resistant vacuum heat insulation material. <P>SOLUTION: A first member 11 arranged in a high temperature side is formed of a raw material with a small coefficient of linear expansion compared with a second member 12 arranged in a low temperature side, and after housing a core material 13 between the first member 11 and the second member 12, a vacuum state is provided in an interior. Deterioration of heat-insulating properties of the heating chamber 20 due to deformation of the heat resistant vacuum heat insulation material 1 in a thickness direction and separation from the heat resistant heat insulation material 21 is prevented by preventing occurrence of a large difference between a thermal deformation amount of the first member 11 and a thermal deformation amount of the second member 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat insulating material disposed on the outer surface of a high temperature processing apparatus such as a heating device, and more particularly to a heat resistant vacuum heat insulating material in which a sealed outer package made of a heat resistant material containing a heat insulating body is evacuated.

  As an example, the manufacturing process of a glass substrate for a flat panel display includes a heat treatment for heating a glass substrate as a processed product at a predetermined temperature (for example, about 220 ° C. to 230 ° C.). For such heat treatment, a heating device is used that includes a heating chamber having a wall surface made of a heat-resistant heat insulating material and raises the temperature of the heating chamber containing the processed material to a temperature suitable for the heat treatment of the processed material.

  In the heating device, as the temperature in the heating chamber rises, the temperature of the outer surface of the heat-resistant heat insulating material also rises, which not only deteriorates the environment in the room where the heating device is installed, but also makes the temperature distribution in the heating chamber uneven. At the same time, heat loss increases. On the other hand, general heat-resistant insulation materials such as ceramic wool and rock wool used for the wall surface of the heating chamber do not have sufficient heat insulation performance. Increases the size of the device.

  Then, the heating apparatus which has arrange | positioned the vacuum heat insulating material excellent in heat insulation performance on the outer side of the heat-resistant heat insulating material which comprises the wall surface of a heating chamber is proposed (for example, refer patent document 1). However, the vacuum heat insulating material used for consumer electrical equipment is the one in which the inside of the bag-like container of the heat-weldable sheet containing the heat insulating material molded body is evacuated and sealed, and is about several tens to 100 ° C. If it is arranged on the outer surface of a heating apparatus for heat treatment that raises the temperature to a level, the bag-like container melts and breaks, and the vacuum state cannot be maintained.

For this reason, in the heating apparatus disclosed in Patent Document 1, a bag-like container whose inside is in a vacuum state is a heat-weldable sheet including a metal aluminum layer and has an infrared reflectance of 2 to 6 μm and a reflectance of 50%. As mentioned above, it is supposed that the heat reflectivity and heat insulation properties are ensured by using a heat-weldable sheet having an infrared reflectance of 6 to 14 μm and a wavelength of 20% or less.
JP 2007-093157 A

  However, in the configuration disclosed in Patent Document 1, a bag-like container of a heat-weldable sheet is used for the heat-resistant vacuum heat insulating material disposed on the outside of the wall surface, so that the outer surface temperature of the wall surface exceeds 100 ° C. Is not applicable. By the way, when such a vacuum heat insulating material is arranged outside the wall surface, the temperature of the boundary surface between the wall surface and the bag-like container is remarkably increased, and as a result, it is not rare that it easily exceeds 100 ° C. Therefore, it can be considered that the heat-resistant vacuum heat insulating material is constituted by a metal outer package.

  However, in the same manner as the configuration disclosed in Patent Document 1, when the outer surface made of metal is formed of the same material on the inner surface and the outer surface, the inner surface contacting the outer surface of the wall surface and the outer surface exposed to the outside Due to the temperature difference between the heat-resistant vacuum heat insulating material and the heat-resistant vacuum heat-insulating material, the heat deformation becomes convex toward the inside. For this reason, a gap opened to the outside is formed between the outer surface of the wall surface and the inner surface of the heat-resistant vacuum heat insulating material, and there is a problem that the heat insulating property of the heating chamber is lowered.

  The object of the present invention is to form the inner surface of the outer package from a material having a smaller linear expansion coefficient than the material of the outer surface, to prevent a large difference in the amount of thermal deformation between the inner surface and the outer surface, An object of the present invention is to provide a heat-resistant vacuum heat insulating material for a heating device that can maintain the heat insulating property of a heating chamber without forming an open gap between the outer surface and the inner surface of the heat-resistant vacuum heat insulating material.

  This invention is provided with the outer package body and core material which consist of a 1st member and a 2nd member. The first member is made of a thin plate material and is arranged on the high temperature side. The second member is made of a thin plate material and is disposed on the low temperature side. The first member is made of a material having a smaller linear expansion coefficient than the second member. The outer package is sealed after the periphery of the first member and the second member are joined together and the inside is evacuated. The core material is housed inside the outer package.

  In this configuration, since the linear expansion coefficient of the first member arranged on the high temperature side is smaller than the linear expansion coefficient of the second member arranged on the low temperature side, the first member generated by the temperature difference between the high temperature side and the low temperature side. The difference between the amount of thermal deformation and the amount of thermal deformation of the second member is smaller than when the first member and the second member are made of the same material. By appropriately selecting the materials of the first member and the second member according to the temperature difference between the high temperature side and the low temperature side, the lengths of the first member and the second member after the temperature increase become substantially equal, and the envelope Does not deform in the thickness direction.

In the above configuration, the first member and the second member may be formed of a thin plate metal material. In this case, the outer periphery may be formed by welding the periphery of the first member and the second member. By these, the outer package does not melt at a temperature of about 100 ° C., and high heat resistance can be obtained. For example, the first member can be made of a metal material having a linear expansion coefficient of 11 × 10 ⁻⁶ / ° C., and the second member can be made of a metal material having a linear expansion coefficient of 17 × 10 ⁻⁶ / ° C.

  According to the present invention, the inner surface on the high temperature side does not extend larger than the outer surface on the low temperature side, it is possible to prevent thermal deformation that becomes convex toward the high temperature side, and heat insulation can be maintained. .

  FIG. 1 is a cross-sectional view of a heating apparatus to which a heat-resistant vacuum heat insulating material according to an embodiment of the present invention is applied. For example, the heating apparatus 10 performs a heat treatment for maintaining a plate-like processed material such as a plurality of glass substrates at a processing temperature of, for example, about 220 ° C. to 230 ° C. for a certain period of time. For this reason, the heating apparatus 10 is provided with the heat-resistant heat insulating materials 21-24 and the heat-resistant vacuum heat insulating materials 1-4.

  The heat-resistant heat insulating materials 21 to 24 constitute a wall surface that surrounds the heating chamber 20. A plurality of processed products are stored in the heating chamber 20. The heating chamber 20 is heated by a heater (not shown) so as to maintain the processing temperature. The heat resistant heat insulating materials 21 to 24 are heat insulating materials having excellent heat resistance such as glass wool, rock wool, or ceramic wool. Although the inner surfaces of the heat-resistant heat insulating materials 21 to 24 are exposed to the heating chamber 20 having a temperature of 220 ° C. to 230 ° C., the temperature of the outer surface becomes approximately 50 ° C. due to the heat insulating effect.

  Since the heat-resistant vacuum heat insulating materials 1 to 4 have the same configuration, the heat-resistant vacuum heat insulating material 1 will be described below. The heat-resistant vacuum heat insulating material 1 includes a first member 11, a second member 12, and a core material 13.

  Each of the first member 11 and the second member 12 is formed by joining four sides of a metallic rectangular thin plate material (for example, a plate thickness of 0.1 mm or less) by, for example, welding or the like. The outer package is configured. In the heat-resistant vacuum heat insulating material 1, the space between the first member 11 and the second member 12 is in a vacuum state, and the core material 13 is accommodated in this space.

As an example, the first member 11 is made of SUS430 having a linear expansion coefficient of 11 × 10 ⁻⁶ / ° C., and the second member 12 is made of SUS304 having a linear expansion coefficient of 17 × 10 ⁻⁶ / ° C. .

  The core material 13 is made of a heat insulating material having excellent heat resistance such as glass wool, rock wool, or ceramic wool, a porous material such as a foam, or fine powder, and includes a first member 11 and a second member 12. The volume of the space between is secured.

  The heat-resistant vacuum heat insulating material 1 is disposed such that the outer surface of the first member 11 is in contact with the outer surface of the heat-resistant heat insulating material 21 and the outer surface of the second member 12 is exposed to the outside. Accordingly, the first member 11 is disposed on the high temperature side, and the second member 12 is disposed on the low temperature side.

  The temperature of the first member 11 easily rises to a temperature exceeding 100 ° C. due to contact with the heat resistant heat insulating material 21. The heat of the first member 11 is conducted to the second member 12 through the peripheral end surfaces in contact with each other. However, since the hollow portion of the outer package in which the first member 11 and the second member 12 are not in contact is in a vacuum state and the core material 13 is housed, the heat of the first member 11 is convection or radiation. Does not propagate to the second member 12. Therefore, the temperature of the second member 12 is higher than the temperature in the room where the heating device 10 is installed, but is sufficiently lower than the temperature of the first member 11, and is higher than the temperature of the first member 11. There is a difference.

  The first member 11 and the second member 12 extend with a thermal deformation amount proportional to the increase in size and temperature, but the first member 11 is made of a material having a smaller linear expansion coefficient than the second member 12, Even if a large temperature difference occurs between the two, there is no significant difference in the amount of thermal deformation. For this reason, the heat resistant vacuum heat insulating material 1 is not deformed in the thickness direction during the heat treatment, and the heat insulating property of the heating chamber 20 is deteriorated due to the inner surface of the first member 11 being separated from the outer surface of the heat resistant heat insulating material 21. Will not occur.

  On the other hand, in the heat-resistant vacuum heat insulating material 110 in which the first member 111 and the second member 112 are the same material as in the heating device 100 of the comparative example shown in FIG. 2, the expansion amount of the first member 111 on the high temperature side is high. The amount of expansion of the second member 112 on the low temperature side is larger than the amount of expansion, causing thermal deformation that becomes convex toward the high temperature side. Due to this thermal deformation, the heat-resistant vacuum heat insulating material 110 has the inner peripheral surface spaced apart from the outer surface of the heat-resistant heat insulating materials 21 to 24, and an open gap is formed between the heat-resistant heat insulating materials 21 to 24 and the outer surface. As a result, the heat insulation of the heating chamber 20 decreases.

  In the heating device 10 according to the embodiment of the present invention, since the heat-resistant vacuum heat insulating material 1 is not deformed and the heat insulation of the heating chamber 20 is not lowered, the thermal efficiency of the heating device 10 is not lowered. In addition, it is possible to suppress the deterioration of the working environment due to the temperature rise at the installation location of the heating device 10.

  Drawing 3 (A)-(D) is a figure showing an example of a manufacturing process of a heat-resistant vacuum heat insulating material concerning an embodiment of this invention. At the time of manufacturing the heat-resistant vacuum heat insulating material 1, first, as shown in FIG. 3 (A), the first member 11 and the second member 12 that are thin metal plates are cut into a rectangular shape and overlapped, and then the three sides 30A to 30C. Are joined together by welding or the like to form the bag 30.

  Next, as shown in FIG. 3B, the side 30 D that is not joined to the bag body 30 is opened, and the core member 13 is inserted into the bag body 30.

  After that, as shown in FIG. 3 (C), the bag body 30 containing the core material 13 is housed in a vacuum tank (not shown) and evacuated, and then opened as shown in FIG. 3 (D). By sealing the side 30D by welding or the like, the heat-resistant vacuum heat insulating material 1 is completed.

  In addition, in the heating apparatus 10, the heat-resistant vacuum heat insulating materials 2-4 are arrange | positioned, respectively, making the outer surface of a 1st member contact each outer surface of the heat-resistant heat insulating materials 22-24. However, all of the heat-resistant vacuum heat insulating materials 1 to 4 are not essential, and at least one of the heat-resistant vacuum heat insulating materials 1 to 4 may be arranged depending on the installation state of the heating device 10 or the like.

  In addition, the materials of the first member 11 and the second member 12 can be selected as appropriate so as not to cause a large difference in the amount of thermal deformation according to the temperature rises during the heat treatment, and the heat resistance is satisfactory. However, a non-metallic material can also be used on condition that the thin plate material is not limited to a flat plate.

  Furthermore, the joining method of the 1st member 11 and the 2nd member 12 is not restricted to welding, Other joining methods, such as adhesion | attachment, can also be used on the condition that internal airtightness is maintained.

  In addition, depending on the operating temperature of the heating device 10, the heat-resistant heat insulating material 21 is not used, and only the heat-resistant vacuum heat insulating material 1 can be used as the heat insulating means.

  The description of the above-described embodiment is an example in all respects, and should be considered as not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

It is sectional drawing of the heating apparatus to which the heat-resistant vacuum heat insulating material which concerns on embodiment of this invention is applied. It is sectional drawing of the heating apparatus to which the heat-resistant vacuum heat insulating material of a comparative example is applied. (A)-(C) are figures which show an example of the manufacturing process of the heat-resistant vacuum heat insulating material which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat resistant vacuum heat insulating material 10 Heating apparatus 11 1st member 12 2nd member 13 Core material 20 Heating chamber 21 Heat resistant heat insulating material

Claims (4)

A first member made of a thin plate-like material arranged on the high temperature side and a second member made of a thin plate-like material arranged on the low temperature side, and the periphery of the first member and the second member are joined together, An envelope that is sealed after being evacuated,
A core material housed inside the outer package,
The first member is a heat-resistant vacuum heat insulating material made of a material having a smaller linear expansion coefficient than the second member.   The heat-resistant vacuum heat insulating material according to claim 1, wherein the first member and the second member are made of a thin plate metal material.   The heat-resistant vacuum heat insulating material according to claim 2, wherein the outer package is formed by welding the periphery of the first member and the second member.   The heat resistant vacuum heat insulating material according to any one of claims 1 to 3, wherein the core material is made of a heat resistant heat insulating material.

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