JP2006275188A - Insulated container and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an insulated container capable of realizing a welding seal which can reinforce an insulating effect by restraining the heat-transfer of a soldering section and makes it difficult to produce sealing defects while following a shape of a welding surface. <P>SOLUTION: In the insulated container 1 formed in a vacuum-sealed state by welding a plurality of metal plates 2 and 3, a soldering material 6 and isolating material 7 are arranged between welding sections 2a and 3a of the metal plates 2 and 3 to be welded, and soldering welding is performed by melting the solder material at high temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat insulating container used in an industrial furnace, an incinerator, a power plant, and the like, and a method for manufacturing the same. In particular, the present invention relates to a vacuum heat insulating container for a vacuum heat insulating panel and a method for manufacturing the same.

  In recent years, high-performance heat insulation panels are required for energy saving and cost reduction.

  In the fields of semiconductors, electronic devices and the like, there is a particular need for heat-insulating panels that do not generate dust as the performance of components increases in size and size. In order to meet such a demand, various vacuum heat insulating containers and methods for manufacturing the same have been proposed.

  Even if the outer shell (case) is manufactured by drawing, pressing, or the like in a heat-insulated container whose inside is evacuated, a joint surface that necessarily needs to be vacuum-sealed remains. At present, the part is sealed by welding, or is sealed by heat fusion using an adhesive or an organic material. In particular, in a heat-insulated container used at 100 ° C. or higher, it is necessary to use a metal case, and sealing is performed by welding.

For example, in a powder vacuum insulator, a container obtained by deep-drawing a part of the first metal foil and a plate-like portion not subjected to processing are integrally formed, and after filling the container with a powdery filler, A cover is disclosed in which a cover made of a second metal foil covering both the container and the plate-like portion is covered, and the periphery of the cover and the first metal foil is vacuum-sealed by ultrasonic welding (patent) Reference 1). Further, a vacuum heat insulating container is disclosed in which a metal outer plate opposite to a metal outer plate is joined (seam welded) with an end portion sandwiched by a separator made of a honeycomb structure (Patent Document 2). reference).
Japanese Patent Application Laid-Open No. Sho 62-35197 (claim 1 in the left column of page 1, page 3, lines 1 to 7, line 1) Japanese Patent Laid-Open No. 10-26294 (paragraphs [0018] and [0022], FIG. 1 in the detailed description of the invention)

  However, in the above-described prior art bonding, the thermal conductivity of the bonded portion or the bonded portion is higher than that of the other portion (for example, when a stainless steel container is welded with a copper-based brazing material, λSUS≈20 W / ( m · K) <λCu≈400 W / (m · K)), heat easily flows and the heat insulation effect is impaired. In addition, when heat is applied for joining, the plane of the welding allowance may be deformed (for example, when it is wavy) and may be welded without being completely sealed. .

  As a means of avoiding these problems, it is conceivable to reduce the amount of brazing material and reduce the heat transfer area by narrowing the welding margin area, but the brazing material is not evenly distributed or the amount is reduced. If the metal surface is wavy due to the reduction, there remains a problem that pinholes and gaps are easily formed.

  Therefore, the present invention realizes a weld seal that suppresses heat transfer at the brazed portion and enhances the heat insulation effect, and can follow the shape even if the weld surface is deformed and hardly causes a sealing defect. An object is to obtain an insulated container.

  In order to solve the above problems, in the present invention, in a heat insulating container formed by welding a plurality of metal plates and vacuum-sealing, a brazing material and a heat insulating material are disposed between welded portions of the metal plates to be welded. The brazing filler metal is melted at a high temperature and brazed and welded. As a result, heat transfer at the soldered part is suppressed by the interposition of the heat insulating material, and even if there is deformation of the weld surface, the shape can be followed, and the heat insulation effect is enhanced and a weld seal that is less prone to sealing defects is realized. An insulated container can be obtained.

  In addition, if the brazing material and the heat insulating material are placed between the welded portions, and the brazing material is melted and soaked into the heat insulating material at a high temperature, a heat insulation effect is obtained by brazing and welding. Along with the reinforcement, it is possible to easily produce a welded seal that hardly causes a sealing defect.

  In addition, if a heat insulating container in which a heat insulating material in which the brazing material is previously impregnated is disposed between the welded portions, a weld seal that is less likely to cause a sealing defect can be more easily manufactured with an enhanced heat insulating effect.

  Further, if the heat insulating material is a heat insulating container selected from materials having a thermal conductivity of 1.0 W / (m · K) or less and a porosity of 50% or more, the brazing material is firmly attached to the heat insulating material. By soaking, it is possible to easily realize a welded seal that is less likely to cause a sealing defect as well as enhancing the heat insulating effect.

  Further, in a method of manufacturing a heat insulating container in which a plurality of metal plates are welded and vacuum-sealed, a brazing material and a heat insulating material are disposed between welded portions of the metal plates to be welded, and the brazing material is disposed at a high temperature. It is set as the manufacturing method of the heat insulation container which melts and brazes and welds. This suppresses heat transfer at the soldered part due to the presence of the heat insulating material, can follow the shape of the weld surface even if it is deformed, and realizes a welding seal method that enhances the heat insulation effect and hardly causes sealing defects it can.

  In addition, if the brazing material and the heat insulating material are placed between the welds, the brazing material is melted at a high temperature and soaked into the heat insulating material, and the manufacturing method of the heat insulating container for brazing welding, Along with the enhancement of the heat insulation effect, it is possible to efficiently provide a weld seal that hardly causes a sealing defect.

  Moreover, if it is set as the manufacturing method of the heat insulation container which arrange | positions the heat insulating material which pre-soaked the said brazing material between the said weld parts, with the reinforcement of a heat insulation effect, it can give efficiently the welding seal which is hard to produce a sealing defect. it can.

  As described above, according to the present invention, the heat transfer of the brazed portion is suppressed by the presence of the heat insulating material, and the shape can be followed even if the weld surface is deformed, and the heat insulation effect is enhanced and the sealing defect is generated. Difficult weld seal can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 relate to the first embodiment. FIG. 1 is an external perspective view of a heat insulating container. FIG. 2 is a longitudinal sectional view of the heat insulating container of FIG. FIG. 3 is an explanatory view for explaining the welding principle of the heat insulating container based on the partial longitudinal sectional view of the heat insulating container of FIG. 1. In FIG. 2 and FIG. 3, the heat insulating material 7 soaked with the brazing material 6 is denoted by reference numeral 5.

  A heat insulating container 1 formed by welding a plurality of metal plates 2 and 3 and vacuum-sealing them, between the welded portions 2a and 3a of the metal plate 2 and the metal plate 3 to be welded, The material 7 is disposed, and the brazing material 6 is melted at a high temperature to be brazed and welded.

  Here, between the welded portions 2a and 3a, two brazing materials 6 and 6 and a heat insulating material 7 are arranged so as to overlap each other, and the heat insulating material 7 is sandwiched between the brazing materials 6 and 6 as shown in FIG. The brazing materials 6 and 6 are melted and soaked in the heat insulating material 7 at a high temperature and brazed and welded. In addition, arrangement | positioning of the brazing material 6 and the heat insulating material 7 may be sandwiched in a horizontal direction instead of stacking. Further, as shown separately in the lower part of FIG. 3, it is sufficient that the brazing material 6 penetrates into the heat insulating material 7 instead of sandwiching it.

  Instead of placing the brazing material 6 and the heat insulating material 7 on top of each other, a high temperature may be applied so that the heat insulating material 7 in which the brazing material 6 has been impregnated in advance is disposed between the welded portions 2a and 3a. By doing so, the productivity of the heat insulating container is improved without handling the brazing material 6 and the heat insulating material 7 independently during welding.

  The heat insulating material can be appropriately selected from paper, cotton, metal fiber, and a material having a void enough to allow the brazing material to penetrate.

  The manufacture of the heat insulating container 1 is performed as follows.

  Between the welded portions 2a and 3a of the metal plates 2 and 3 to be welded, the brazing materials 6 and 6 and the heat insulating material 7 are arranged so as to overlap each other. Thereafter, the brazing filler metals 6 and 6 are melted at a high temperature, soaked in the heat insulating material 7, and brazed and welded. Alternatively, a heat insulating material 7 in which a brazing material is impregnated in advance can be disposed between the welded portions 2a and 3a, and brazing welding can be performed.

  As the brazing material, a brazing material defined in the JIS standard can be selected and used as appropriate. However, when the exterior plate is made of stainless steel, copper-based, aluminum-based, nickel-based, and silver-based brazing materials can be used. Nickel base is preferable from the viewpoints of corrosion resistance and corrosion resistance.

  An embodiment according to the present invention in which the brazing materials 6 and 6 and the heat insulating material 7 are arranged so as to overlap, and the brazing materials 6 and 6 are melted and soaked into the heat insulating material 7 at a high temperature and brazed and welded. Table 1 shows the thermal conductivity of the welded part and the amount of leakage measured with a helium leak detector for the comparative example in the case of spot welding. In addition, the heat insulating material used in the above embodiment of the present invention is a heat insulating material (Fineflex 1300 paper-T manufactured by NICHIAS) having a thickness of 0.5 mm, a thermal conductivity of 0.07 W / (m · K), and a porosity. 94%.

  In the present embodiment, since there is the heat insulating material 7 between the joint portions 2a and 3a, the heat flow between the joint portions 2a and 3a can be reduced, and the effect of lowering the thermal conductivity of the heat insulation container 1 is produced. Further, the heat insulating material 7 flexibly follows the deformation between the joint portions 2a and 3a at the time of welding, and as shown in FIG. 4, the brazing material 6 covers the surfaces of the joint portions 2a and 3a with the metal plate 2. , 3 swells, can fill the waving and braze.

  In addition, since the brazing material 6 is impregnated into the heat insulating material 7, it can be realized at low cost because of the simple structure.

  Although several embodiments have been described above, in the present invention, the material of the metal plate includes stainless steel, aluminum, aluminum alloy, and copper alloy, but stainless steel is preferable from the viewpoint of low thermal conductivity.

  Further, in the present invention, the thickness of the metal plate may be 0.05 to 10 mm, but at least the plate thickness closer to the heat source is preferably as thin as possible to reduce heat conduction, but is too thin. However, since the expected strength cannot be obtained, it is specifically 0.05 to 1 mm, preferably 0.1 to 0.6 mm.

  Moreover, regarding the atmospheric pressure (degree of vacuum) in the inner space of the heat insulating container, vacuum sealing means that the air pressure in the inner space of the heat insulating container is 0.1 to 1000 Pa. In the present invention, 100 to 600 ° C. In order to ensure the heat insulation performance in a relatively high temperature range, it is preferably 0.1 to 10 Pa, more preferably 0.1 to 1 Pa.

  The heat insulating material that can be inserted into the inner space of the heat insulating container has a thermal conductivity of 0.1 W / (m · K) or less, preferably 0.05 W / (m · K) or less, more preferably 0.02 W / (m · K) or less, for example, glass fiber heat insulating material, ceramic fiber heat insulating material, calcium silicate heat insulating material, rock wool, ceramic porous body, honeycomb material, metal multilayer reflector, etc. In the present invention, it is preferable to use a ceramic porous body or a ceramic fiber heat insulating material from the viewpoint of low thermal conductivity.

  In the present invention, the brazing temperature may be, for example, by melting the brazing material at a temperature exceeding the liquidus of the brazing material (for example, 500 to 1100 ° C.). Specifically, it is 600 to 1100 ° C. for a copper base, 500 to 700 ° C. for an aluminum base, 800 to 1100 ° C. for a nickel base, and 550 to 850 ° C. for a silver base.

  INDUSTRIAL APPLICABILITY The present invention is useful as a vacuum heat insulating container for a vacuum heat insulating panel used in an industrial furnace, an incinerator, a power plant and the like, and a method for manufacturing the same.

It is an external appearance perspective view of the heat insulation container in 1st Embodiment by this invention. It is a longitudinal cross-sectional view of the heat insulation container of FIG. It is explanatory drawing explaining the welding principle of the heat insulation container which concerns on this invention based on the partial longitudinal cross-sectional view of the heat insulation container of FIG. It is sectional explanatory drawing explaining the difference of the effect by the welding using the conventional brazing material welding and the brazing material based on this invention, and a heat insulating material.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Heat insulation container, 2, 3 Metal plate, 2a, 3a Welding part, 5, 7 Heat insulation material, 6 Brazing material.

Claims (7)

In a heat insulating container formed by vacuum sealing by welding a plurality of metal plates,
A heat insulating container, wherein a brazing material and a heat insulating material are disposed between weld portions of the metal plate to be welded, and the brazing material is melted and brazed at a high temperature.   2. The brazing material and the heat insulating material are disposed between the welded portions, the brazing material is melted at a high temperature, soaked in the heat insulating material, and brazed and welded. Insulated container.   The heat insulation container according to claim 1, wherein a heat insulating material in which the brazing material is impregnated in advance is disposed between the welded portions.   The said heat insulating material is selected from the materials whose heat conductivity is 1.0 W / (m * K) or less and whose porosity is 50% or more, The Claim 1 thru | or 3 characterized by the above-mentioned. Insulated container. In the manufacturing method of the heat insulating container that forms a vacuum seal by welding a plurality of metal plates,
A method for manufacturing a heat insulating container, comprising: arranging a brazing material and a heat insulating material between weld portions of the metal plate to be welded, melting the brazing material at a high temperature and performing brazing welding.   6. The brazing material and the heat insulating material are disposed in an overlapping manner between the welded portions, the brazing material is melted at a high temperature, soaked in the heat insulating material, and brazed and welded. A method for manufacturing an insulated container. The method for manufacturing a heat insulating container according to claim 5, wherein a heat insulating material in which the brazing material is impregnated in advance is disposed between the welded portions.

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