JP5222218B2 - CORE MATERIAL, CORE MATERIAL MANUFACTURING METHOD, AND VACUUM DOUBLE STRUCTURE USING CORE MATERIAL - Google Patents

Description

  The present invention mainly relates to a core material disposed in an internal space of a vacuum double structure, a method for producing the core material, and a vacuum double structure using the core material.

  As a vacuum double structure in which a core material is disposed in an internal space, vacuum heat insulating panels described in Patent Documents 1 and 2 are known. In Patent Document 1, a core material is formed by adding dry silica having an average primary particle diameter of 7 nm and silica alumina fibers having an average fiber diameter of 0.8 nm, mixing them, putting them into a mold, and pressurizing them. And after inserting this core material in a jacket material, it is set as the structure evacuated. Moreover, in patent document 2, it is set as the structure which evacuates, after laminating | stacking and arrange | positioning the spacer (core material) and metal foil which consist of a some fibrous sheet between the metal plates which make a sheet form.

  However, these Patent Documents 1 and 2 have a problem that when an external force is applied, the inner core material contracts, so that the metal plate as the outer cover material is plastically deformed. In addition, when the metal plate located outside during use is exposed to high temperature, the volume of the core material shrinks, and the outer metal plate may be deformed by heat and the heat insulation performance may be significantly reduced. In this case, since heat is transferred from the outer metal plate to the inner metal plate, the purpose of heat insulation cannot be achieved.

  On the other hand, Patent Documents 3 and 4 describe a vacuum double structure that can hold a pair of metal plates at a predetermined interval. In patent document 3, the core material made into the shape which repeats a continuous unevenness | corrugation with the resin material with low heat conductivity is provided, and it is set as the structure which arrange | positions this core material and an inorganic air permeable filling. Moreover, in patent document 4, it is set as the structure which arrange | positions the positioning member which makes a cone cylinder shape in one metal plate, and arrange | positions a spherical spacer in this positioning member.

  However, in Patent Document 3, since the concavo-convex part is in contact with the opposing surfaces of the pair of metal plates, it can counter some external force, but the volume shrinks when exposed to heat, so that the heat insulating performance Cannot be maintained. In addition, since it is necessary to fill the gaps between the core materials with the inorganic air-permeable filler, handling is extremely complicated.

  Moreover, in patent document 4, since the spherical spacer which has heat resistance makes the point contact state to the opposing surface of a pair of metal plate, while being able to oppose external force, heat insulation performance can be maintained even if exposed to heat. However, since it is necessary to position the spherical spacer with the positioning member, handling is extremely complicated and the production efficiency is extremely poor.

JP 2002-310383 A JP 2004-60852 A Japanese Patent Laid-Open No. 58-40478 JP 2007-327549 A

  The present invention has been made in view of conventional problems, and a first object is to provide a core material that is extremely easy to handle and a method for manufacturing the same. A second object is to provide a vacuum double structure whose use is greatly expanded by using this core material.

In order to solve the above problems, the first core material of the present invention has a high heat resistance and a low thermal conductivity between a pair of base material sheets made of a fibrous sheet that has low thermal conductivity and is elastically deformable. A large number of spherical members harder than the base sheet are arranged in a scattered manner.
The second core material has a large number of spherical members having a high heat resistance, a low thermal conductivity and harder than the base sheet, in a base sheet made of a fiber sheet having a low thermal conductivity and elastically deformable. It is set as the structure which was embedded and arrange | positioned in the state which was scattered .

Since these core materials are arranged by interspersing a large number of spherical members on a base sheet made of a deformable fibrous sheet , handling when disposed in the internal space of the vacuum double structure is possible. Very good.

In addition, the manufacturing method of a 1st core material is the said 1st base material sheet with high heat resistance and low heat conductivity on the upper surface of the 1st base material sheet which consists of a fibrous sheet which has low heat conductivity and is elastically deformable. A plurality of harder spherical members are scattered and disposed, and a second base sheet made of a fibrous sheet having low thermal conductivity and elastically deformable is disposed on the spherical member. By fixing the second base sheet, a spherical member is disposed between the pair of base sheets.
The second core material manufacturing method includes immersing a fiber having low thermal conductivity and elastically deformable fibers in a diluted adhesive, and a large number of spherical members having high heat resistance, low thermal conductivity, and harder than the fibers. Sprinkled and immersed in an adhesive, a base sheet made of a fibrous sheet containing the spherical member is taken out from the adhesive and dried to embed and arrange the spherical member inside the base sheet It is.
Moreover, the manufacturing method of the 2nd core material arrange | positions the base material sheet | seat which consists of a fiber sheet with low heat conductivity and elastic deformation on the upper surface of a fixed base, and heat resistance is provided on the surface of the base material sheet. A large number of spherical members harder than the base sheet having high thermal conductivity and low density are disposed, and the base sheet is deformed by pressing with a movable frame from above the base sheet. You may arrange | position in the state which embedded at least one part of the spherical member .
If it does in this way, the convenient core material of the handling which arranged the spherical member with respect to the base material sheet can be manufactured.

Further, the first vacuum double structure using the core material of the first and second invention is a vacuum double structure formed by evacuating the internal space formed between the first and second metal plates facing each other. It arrange | positions in the state which made the said core material contact the opposing surface of each said metal plate.

  In the vacuum double structure, when an external force is applied to the metal plate, the metal plate interferes with the spherical member, so that the metal plate can be prevented from being plastically deformed. Furthermore, since the volume of the spherical member does not shrink when exposed to a high temperature, the distance between the pair of metal plates, that is, a space for heat insulation can be reliably maintained.

Furthermore, the second vacuum double structure using the core material of the first and second inventions is disposed in a state where the core material is in contact with one of the opposing surfaces of the first and second metal plates. It is.

If it does in this way, a substrate sheet can be arranged in the state where it floated in the internal space between a pair of metal plates .

In the core material and the manufacturing method thereof according to the present invention, since a large number of spherical members are scattered on the base sheet made of a deformable fibrous sheet , the core material is disposed in the internal space of the vacuum double structure. Handling is very good. And in the vacuum double structure using this core material, even if an external force is applied to the metal plate, the metal plate can be prevented from being plastically deformed by the spherical member. Moreover, even when exposed to high temperatures, a space for heat insulation can be maintained by the spherical member .

The core material of 1st Embodiment of this invention is shown, (A) is a perspective view, (B) is sectional drawing. (A), (B), (C), (D) is sectional drawing which shows the manufacturing method of the core material of 1st Embodiment. It is sectional drawing which shows the core material of 2nd Embodiment. (A), (B), (C) is sectional drawing which shows the manufacturing method of the core material of 2nd Embodiment. It is sectional drawing which shows the core material of 3rd Embodiment. (A), (B), (C) is sectional drawing which shows the manufacturing method of the core material of 3rd Embodiment. It is sectional drawing which shows the core material of a 1st reference example . It is sectional drawing which shows the core material of the 2nd reference example . (A), (B) is sectional drawing which shows the manufacturing method of the core material of a 2nd reference example . It is sectional drawing which shows the core material of a 3rd reference example . (A), (B) is sectional drawing which shows the manufacturing method of the core material of a 3rd reference example . It is sectional drawing which shows the core material of a 4th reference example . It is sectional drawing which shows the manufacturing method of the core material of a 4th reference example . It is sectional drawing which shows the vacuum heat insulation panel of 4th Embodiment using the core material of 1st Embodiment. FIG. 15 is an exploded perspective view of FIG. 14. It is a perspective view which shows the vacuum heat insulation panel of the 5th reference example using the core material of the 4th reference example . (A), (B) is sectional drawing which shows the thermos of 5th Embodiment using the core material of 2nd Embodiment. It is sectional drawing which shows the fireproof safe of 6th Embodiment using the core material of the 1st reference example .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1A and 1B show a core material 10 according to a first embodiment of the present invention. The core material 10A is formed by interposing a large number of spherical members 12A between a pair of base material sheets 11A1 and 11A2.

  The base sheets 11A1 and 11A2 are made of a fibrous sheet having low thermal conductivity and elastically deformable. As the fibrous sheet, a cotton-like material made of short glass fiber or ceramic fiber is applicable.

The spherical member 12A has a spherical shape made of zirconia (Zro ₂ ), which is a kind of hard (Vickers hardness Hv: 1150 to 1200) ceramic having low thermal conductivity and high heat resistance. The spherical member 12A is arranged in parallel at equal intervals in the vertical and horizontal directions between the pair of base material sheets 11A1 and 11A2. The spherical member 12 is not limited to a ceramic ball, and may be made of silica (SiO ₂ ) or a heat resistant resin, and may be any material as long as it has a low thermal conductivity and is hard.

  The thicknesses of the base sheets 11A1 and 11A2 and the diameter of the spherical member 12A are determined by the width of the internal space (gap between the opposing metal plates 31), which is an arrangement site of the vacuum double structure to be used, and the core material 10A. It is set according to the purpose of arrangement. That is, there are no restrictions on the thickness of the base sheet 11A1, 11A2 and the diameter of the spherical member 12A. For example, when the core material 10A is disposed for the purpose of maintaining a gap between the opposing metal plates 31 that is the width of the internal space, the diameter of the spherical member 12A is substantially the same as or slightly smaller than the set width of the internal space. Formed in diameter. Further, in the case where the core material 10A is provided for the purpose of securing a large internal space in order to enhance the heat insulation performance, while preventing the metal plate 31 located outside from contacting the metal plate 31 located inside due to deformation. The diameter of the spherical member 12A is formed as small as possible (for example, 10 μm). And the thickness of base material sheet 11A1, 11A2 is formed by the thinnest possible thickness so that the spherical member 12A can be hold | maintained in any case. The number of the spherical members 12A is set according to the pressure strength of the spherical member 12A itself and the required pressure strength against the external force applied through the metal plate 31 of the vacuum double structure.

  Next, an example of a manufacturing method of the core material 10A of the first embodiment will be described.

  First, as shown in FIG. 2A, the first base sheet 11 </ b> A <b> 1 is disposed on the lower fixed base 20. A substantially hemispherical immersion portion 21 corresponding to the diameter of the spherical member 12A is formed on the mounting (upper) surface of the lower fixed base 20.

  Next, as shown in FIG. 2B, the spherical member arrangement frame 22 that adsorbs the spherical members 12A in a predetermined arrangement is arranged on the first base sheet 11A1. Note that a positioning concave portion 23 having a substantially hemispherical shape is provided on the suction portion of the spherical member 12 </ b> A on the suction (lower) surface of the spherical member arrangement frame 22. The positioning recess 23 is provided with a suction passage 24, and the suction passage 24 is connected to a suction pump (not shown). Therefore, the spherical member disposition frame 22 is disposed on the first base sheet 11A1 in a state where the spherical member 12A is adsorbed by the suction pump, and the suction pump is stopped. Thereby, on the 1st base material sheet 11A1, it can arrange in the state where many spherical members 12A were scattered by predetermined arrangement.

  Next, as shown in FIG. 2C, the second base sheet 11A2 is disposed on the spherical member 12A. Thereafter, the movable press frame 25 is pressed from above the second base sheet 11 </ b> A <b> 2 toward the lower fixed base 20. A substantially hemispherical immersion portion 26 corresponding to the diameter of the spherical member 12A is formed on the press (lower) surface of the movable press frame 25. As a result, as shown in FIG. 2D, the spherical member 12A is covered with the base sheet 11A1 and 11A2 at the part where the spherical member 12A is disposed, and the base sheet is provided at the part where the spherical member 12A is not present. 11A1 and 11A2 can be superposed.

  The pair of base material sheets 11A1 and 11A2 are fixed to each other simultaneously with pressing by the movable press frame 25 by applying a predetermined adhesive to at least one of the opposing surfaces. Alternatively, the pair of base material sheets 11A1 and 11A2 are fixed by needle punching at a predetermined position or by penetrating a predetermined fastener.

  Since the core material 10A of the first embodiment manufactured in this way is arranged by interposing a large number of spherical members 12A on the base sheet 11A1, 11A2 made of an elastically deformable fibrous sheet, The handling when disposed in the internal space of the vacuum double structure is very good.

  FIG. 3 shows a core material 10B of the second embodiment. This core material 10B is different from the first embodiment in that the core material 10B is embedded and arranged so that a large number of spherical members 12B are scattered inside one base sheet 11B. The base sheet 11B is made of a fibrous sheet similar to that of the first embodiment, and the spherical member 12B is made of a ceramic or heat resistant resin ball similar to that of the first embodiment. Similarly, the thickness of the base sheet 11B and the diameter of the spherical member 12B are set according to the purpose of disposing the vacuum double structure to be used in the internal space.

  Next, the manufacturing method of the core material 10B of 2nd Embodiment is demonstrated.

  First, as shown in FIG. 4A, a large number of fibers 11 </ b> B ′ constituting the base sheet 11 </ b> B are dispersed in the water tank 27. In the water tank 27, an adhesive diluted to bind a large number of fibers to each other is stored. In addition, a mesh member 28 is provided at the bottom of the water tank 27 for taking out the core material 10B 'that is in a precipitated state. For this reason, the fibers 11 </ b> B ′ dispersed in the water tank 27 are immersed in the adhesive and deposited on the mesh member 28. Then, as shown in the figure, when the fibers 11B ′ of less than half of the amount conceived of the target wall thickness are precipitated, the spherical member arrangement frame 22 is arranged on the water tank 27 as in the first embodiment, and the fibers A large number of spherical members 12B are arranged in a predetermined arrangement on the precipitation layer 11B ′.

  Next, as shown in FIG. 4B, the fibers 11B 'are again sprayed from above the spherical member 12B so that the base sheet 11B has the desired thickness. Then, as shown in FIG. 4C, by removing the mesh member 28 from the water tank 27, the core material 10B 'including the spherical member 12B in the fiber 11B' is taken out. Then, by drying, the core material 10B in a state where the spherical member 12B is embedded inside so as not to fall off the base sheet 11B can be manufactured.

  The core material 10B according to the second embodiment manufactured as described above is very easy to handle as in the first embodiment. Moreover, since the spherical member 12B is disposed in an embedded state when the base sheet 11B is manufactured, the spherical member 12B does not fall off. In addition, the number of manufacturing work steps can be greatly reduced as compared with the first embodiment.

  FIG. 5 shows a core material 10C of the third embodiment. As in the second embodiment, the core material 10C is arranged so that a large number of spherical members 12C are scattered within one base sheet 11C, but the spherical member is formed on the base sheet 11C after molding. It is different from the second embodiment in that 12C is embedded. The base sheet 11C is made of a fibrous sheet similar to that in each embodiment, and the spherical member 12C is made of a ceramic or heat resistant resin ball similar to that in each embodiment. Similarly, the thickness of the base sheet 11C and the diameter of the spherical member 12C are set according to the purpose of disposing the vacuum double structure to be used in the internal space.

  Next, the manufacturing method of 10 C of core materials of 3rd Embodiment is demonstrated.

  First, as illustrated in FIG. 6A, the base sheet 11 </ b> C is disposed on the lower fixed base 20. The mounting surface of the lower fixed base 20 is not provided with the immersion portion 21 shown in the first embodiment. In addition, the lower fixing base 20 for manufacturing the core material 10C of the third embodiment is preferably formed of a material having a slight elasticity.

  Next, similarly to the first embodiment, the spherical member disposition frame 22 is disposed on the base sheet 11C, and as shown in FIG. 6B, a large number of spherical members 12C are disposed on the base sheet 11C. Arrange them in a scattered state in the array. After that, as shown in FIG. 6C, the base member sheet 11C is partially deformed by pressing the spherical member 12C toward the lower fixed base 20 by the movable press frame 25, and the spherical member 12C is used as a base. The material sheet 11C is pushed to a substantially intermediate position in the thickness direction. Note that the immersion surface 26 shown in the first embodiment is not provided on the press surface of the movable press frame 25. The pushing of the spherical member 12C depends on the diameter of the spherical member 12C and the roughness between the fibers of the base sheet 11C. Therefore, when the roughness of the base sheet 11C is sufficient, the spherical member 12C at room temperature is pushed in. When the roughness of the base sheet 11C is smaller than the diameter of the spherical member 12C, the spherical member 12C is kept at a predetermined temperature. It is preferable to heat and arrange.

  The core material 10C according to the third embodiment manufactured in this way is very good in handling as in the first embodiment. And compared with 1st Embodiment, the manufacturing operation man-hour can be reduced significantly.

FIG. 7 shows a core material 10D of the first reference example . As in the first embodiment, the core material 10D is arranged such that a large number of spherical members 12D are interspersed between a pair of base material sheets 11D1 and 11D2, but the base material sheets 11D1 and 11D2 This is largely different from the first embodiment in that the material is changed.

Specifically, the base material sheets 11D1 and 11D2 of the core material 10D of the first reference example are made of a deformable metal foil for preventing radiant heat transfer. As this metal foil, a thin film made of copper or aluminum can be applied.

  The spherical member 12D is made of a ceramic or heat-resistant resin ball similar to that of each embodiment, and the diameter thereof is set according to the purpose of placement in the internal space of the vacuum double structure to be used. Further, the base sheets 11D1 and 11D2 are formed with a thickness (5 to 20 μm) that is as thin as possible so that the spherical member 12D can be held.

The core material 10D of the first reference example is manufactured by the same manufacturing method as the core material 10A of the first embodiment. And core material 10D using base sheet 11D1, 11D2 which consists of metal foils is very favorable similarly to each embodiment. And when it uses for the internal space of a vacuum double structure, the effect that radiation heat transfer can be prevented can be acquired.

FIG. 8 shows a core material 10E of the second reference example . The core material. 10E, the single base sheet 11E made of the same metal foil as the first reference example, a point obtained by disposing the first reference example as well as of the spherical member 12E, different from the first reference example ing.

Next, a method for manufacturing the core material 10E of the second reference example will be described.

  First, as illustrated in FIG. 9A, the base sheet 11 </ b> E is disposed on the lower fixed base 20 having the immersion portion 21. And the spherical member arrangement | positioning frame 22 which adsorb | sucked the spherical member 12E by the predetermined arrangement | sequence corresponding to the immersion part 21 is arrange | positioned on the base material sheet | seat 11E like illustration.

  Next, as shown in FIG. 9B, the base material sheet 11E is partially curved and deformed by pressing toward the lower fixed base 20 by the spherical member arrangement frame 22, and a part of the spherical member 12E is obtained. Is disposed in a state of being covered (embedded) with the base sheet 11E. The base sheet 11E and the spherical member 12E are preferably fixed by an adhesive or heat welding.

Core 10E of the second reference example, as in the first reference example, upon handling is very good, when used in the internal space of the vacuum double structure, it is possible to prevent the radiation heat transfer. And the base material sheet 11E which consists of metal foil does not have the base material sheet 11E in the half area | region of the spherical member 12E. That is, when the diameter of the spherical member 12E is set to be approximately the same as the width of the internal space of the vacuum double structure, the base sheet 11E made of metal foil is not in contact with one metal plate 31. Therefore, the use for the vacuum double structure can be expanded as compared with the first reference example .

FIG. 10 shows a core material 10F of the third reference example . This core material 10F is different from the respective embodiments in that a large number of spherical members 12F are interspersed so as to be partially embedded in one surface of one base sheet 11F. The base sheet 11F is made of the same metal foil as that of the first reference example, and the spherical member 12F is made of the same ceramic or heat-resistant resin balls as those of the embodiments. In this embodiment, a spherical member 12F having a diameter of about 10 μm and a part (about half) of the spherical member 12F made of a metal foil having a thickness of about 10 μm are embedded in the base sheet 11F. It is set as the structure arrange | positioned so that the remainder may protrude from the base material sheet 11F in a state. That is, the core material 10F of the third reference example is an extremely thin material having a thickness of about 15 μm.

Next, the manufacturing method of the core material 10F of the third reference example will be described.

First, as illustrated in FIG. 11A, the base sheet 11 </ b> F is disposed on the lower fixed base 20. In addition, the immersion part 21 is not provided in the mounting surface of this lower fixed stand 20. FIG. In addition, the lower fixing base 20 for manufacturing the core material 10F of the third reference example is preferably formed of a material that does not elastically deform.

Next, the spherical member arrangement frame 22 is arranged on the base sheet 11F, and as shown in FIG. 11 (B), the spherical member arrangement frame 22 is pressed toward the lower fixed base 20 by the spherical member arrangement frame 22. The material sheet 11F is partially deformed, and the spherical member 12F is disposed in a state of being partially embedded in the base material sheet 11F. The spherical member 12F is preferably pushed by heating at least one of the base sheet 11F and the spherical member 12F so that the base sheet 11F can be easily deformed.
As with the second reference example, the core material 10F of the third reference example is extremely easy to handle and can prevent radiant heat transfer when used in the internal space of the vacuum double structure. Moreover, the use for a vacuum double structure can be expanded.

FIG. 12 shows a core material 10G of the fourth reference example . The core material 10G is different from the third reference example in that a large number of spherical members 12G are scattered on both surfaces of a single base sheet 11G so as to be partially exposed. The base sheet 11G is made of the same metal foil as that of the first reference example, and the spherical member 12G is made of the same ceramic or heat-resistant resin balls as those of the embodiments. The base sheet 11G is made of a metal foil having a thickness of about 10 μm, and the spherical member 12G is made of a ceramic or heat-resistant resin ball having a diameter of about 10 μm. That is, the core material 10F of the third reference example is an extremely thin material having a thickness of about 20 μm.

In the core material 10G of the fourth reference example , the spherical member 12G is disposed on one surface of the base sheet 11G in the same manner as the third reference example . Thereafter, as shown in FIG. 13, the base material is arranged such that the one surface side on which the spherical member 12G is disposed is positioned on the lower fixing base 20 provided with the immersion portion 21 so as to coincide with the spherical member 12G disposed on the one surface. The sheet 11G is disposed. And by arranging the spherical member arrangement frame 22 on the base sheet 11G and pressing this spherical member arrangement frame 22 toward the lower fixing base 20, the base sheet 11G is partially deformed, The spherical member 12G is disposed in a state where a part thereof is embedded in the base sheet 11G.

The core material 10G of the fourth reference example, similarly to the second reference example, upon handling is very good, when used in the internal space of the vacuum double structure, it is possible to prevent the radiation heat transfer. In addition, the use of the vacuum double structure can be expanded.

FIG. 14 and FIG. 15 show a vacuum heat insulation panel 30A which is a vacuum double structure of the fourth embodiment using the core material 10A of the first embodiment. This vacuum heat insulation panel 30A has a core material 10A disposed in a vacuum space 34 which is an internal space formed inside a pair of metal plates 31A and 31B. A getter (not shown) for absorbing a gas generated in the vacuum space 34 after evacuation and maintaining a desired degree of vacuum is disposed at a predetermined position of the metal plates 31A and 31B. .

  Specifically, the first and second metal plates 31A and 31B constituting the exterior body of the vacuum heat insulating plate are each made of thin stainless steel (SUS301). These metal plates 31A and 31B have a rectangular shape, bent outer surface portions 32A and 32B on the outer peripheral edge thereof, and joints bent outward so as to form a flange shape from the edges of the outer surface portions 32A and 32B. Edge portions 33A and 33B are formed. These metal plates 31A and 31B are abutted so that the joining edge portions 33A and 33B overlap each other, and are joined by pressure bonding such as seam welding, butt welding such as TIG welding, MIG brazing, or the like. Thereby, a space having a predetermined interval (width) is formed between the metal plates 31A and 31B, and the space constitutes a vacuum space 34 after evacuation. The metal plates 31A and 31B are not limited to stainless steel, but may be iron or titanium, and can be changed according to the required heat-resistant temperature. Moreover, different metal materials may be used for the first metal plate 31A and the second metal plate 31B.

  As shown in FIG. 15, the second metal plate 31 </ b> B before joining is formed with an exhaust part 35 protruding in a convex shape in cross section, and an exhaust hole 36 is formed in the exhaust part 35. The exhaust hole 36 may be formed merely by forming an opening in the second metal plate 31 or may be joined to the tip tube 50. The first metal plate 31 </ b> A is provided with a projecting piece 37 that closes the lower surface of the exhaust part 35.

  In the present embodiment, the metal plates 31A and 31B are both 0.5 mm thin. Further, outer surface portions 32A and 32B are formed between the metal plates 31A and 31B so that a vacuum space 34 having a width of about 5 mm is formed. On the other hand, as the core material 10A, the base sheet 11A1, 11A2 has a thickness of 1 mm and the spherical member 12A has a diameter of 5 mm.

  When manufacturing the vacuum heat insulation panel 30A, the core material 10A is accommodated in the lower metal plate 31A and then covered with the metal plate 31B, and then the joining edges 33A and 33B are joined. Next, after evacuating the internal space from the exhaust hole 36, the base portion (base portion) of the exhaust portion 35 is joined by seam welding and cut at a position flush with the other outer peripheral edge.

  The vacuum heat insulation panel 30A manufactured in this way is in a state where the core material 10A is in contact with the opposing surfaces of the metal plates 31A and 31B. Therefore, the distance between the metal plates 31A and 31B (the width of the vacuum space 34) can be made constant. Further, when an external force is applied to one of the metal plates 31A and 31B, the metal plates 31A and 31B interfere with the spherical member 12A, so that the metal plates 31A and 31B can be prevented from being plastically deformed. Furthermore, when exposed to high temperatures, the base material sheets 11A1 and 11A2 made of a fibrous sheet may shrink in volume, but the spherical member 12A does not shrink in volume. Therefore, the distance between the pair of metal plates 31A and 31B, that is, the vacuum space 34 for heat insulation can be maintained reliably.

Here, not only the core material 10A of the first embodiment but also the core material 10B of the second embodiment, the core material 10C of the third embodiment, and the core material 10E of the second reference example are included in the vacuum heat insulation panel 30A. It can also be used. In the core material 10D of the first reference example , the base sheets 11D1 and 11D2 made of metal foil are in contact with the pair of metal plates 31A and 31B. Therefore, it cannot be used in the fourth embodiment . Moreover, since the core materials 10F and 10G of the sixth and seventh embodiments are extremely thin, they cannot be used in the fourth embodiment because of dimensional problems.

When the core materials 10B and 10C of the second and third embodiments are applied to the vacuum heat insulating panel 30A of the fourth embodiment , the compression margin of the base material sheets 11B and 11C made of the fibrous sheets by the metal plates 31A and 31B is substantially constant. become. In other words, the pair of metal plates 31A and 31B can be supported from the inside with uniform pressure. Therefore, the effect that the external appearance for every vacuum heat insulation panel 30A, 30A can be arranged substantially the same can be further acquired.

When the core material 10E of the second reference example is applied to the vacuum heat insulation panel 30A of the fourth embodiment , the base sheet 11E made of metal foil is not in contact with one of the metal plates 31A and 31B. There is no heat conduction between the metal plates 31A and 31B via 11E. And it can arrange | position in the state which floated the base material sheet | seat 11E in the vacuum space 34 between a pair of metal plates 31A and 31B. Therefore, radiant heat transfer can be reliably prevented and heat insulation performance can be improved.

FIG. 16 shows a vacuum heat insulation panel 30B which is a vacuum double structure of a fifth reference example using the core material 10G of the fourth reference example . Since this vacuum heat insulation panel 30B uses an extremely thin core material 10G, it is different from the fourth embodiment in that the sheet-like metal plates 31A and 31B not provided with the outer surface portions 32A and 32B are used. Yes.

The vacuum heat insulation panel 30B of the fifth reference example configured as described above can obtain the same operations and effects as the vacuum heat insulation panel 30A of the fourth embodiment when the core material 10E of the second reference example is applied. Moreover, the vacuum heat insulation panel 30B of this 5th reference example can acquire the same effect | action and effect, even if it uses the core material 10F of a 3rd reference example instead of the core material 10G of a 4th reference example. .

Moreover, the vacuum heat insulation panels 30A and 30B of the fourth embodiment and the fifth reference example have increased compressive strength due to the spherical members 12A to 12C and 12E to 12G, so that the usable applications (uses) are expanded. For example, the field of resin molding includes an upper mold and a lower mold corresponding to a molded product. For example, the lower mold is fixed to a fixed lower frame, and the upper mold is fixed to a movable upper frame. In order to prevent heat loss when the resin mold is held at a high temperature, a heat resistant resin is interposed between the mold and the frame. However, since this heat-resistant resin deteriorates due to compressive force, it has been necessary to frequently replace (maintenance) it. Therefore, the vacuum heat insulating panels 30A and 30B of the fourth embodiment or the fifth reference example are used instead of the heat resistant resin. Thereby, each mold and the frame can be insulated, and sufficient pressure strength can be obtained, so that the frequency of maintenance can be reduced. However, in this case, it is preferable to dispose a hard metal (precipitation hardening stainless steel SUS631) between the metal plates 31A and 31B and the core materials 10A to 10C and 10E to 10G.

Further, the vacuum heat insulation panel 30B of the fifth reference example can be thin (about 0.5 to 1.0 mm) including the pair of metal plates 31A and 31B. Therefore, this vacuum heat insulation panel 30B can be used as a processing material. For example, the container can be formed by forming the vacuum heat insulation panel 30B into a disk shape and subjecting the vacuum heat insulation panel 30B to deep drawing. In addition, in the case of a process, since many spherical members 12F and 12G are arrange | positioned inside the vacuum heat insulation panel 30B, the metal plates 31A and 31B do not contact. As a result, it is possible to easily manufacture a container having a vacuum double structure.

17A and 17B show a thermos as an example of a vacuum double container 40A that is a vacuum double structure of the fifth embodiment using the core material 10B of the second embodiment. The thermos has an outer container 41 and an inner container 42 made of a stainless steel plate (SUS304) having a wall thickness of 0.2 to 1.0 mm, and a space between them constitutes a vacuum space 43 after evacuation. . And the core material 10B of 2nd Embodiment is arrange | positioned in the vacuum space 43 located in the bottom in this thermos.

  The outer body 44 of the outer container 41 includes a first opening 45 communicating with the inside at one end located on the lower side in FIG. Further, the outer body 44 is provided with a bottom mounting portion 46 having an opening area larger than that of the first opening 45 at the other end located on the upper side in FIG. Further, the outer bottom body closes the bottom of the outer body, has a disk shape with an outer diameter substantially the same as the inner diameter of the bottom mounting portion 46 of the outer body 44, and is fitted and joined to the bottom mounting portion 46. Yes. The central portion of the outer bottom body 47 is recessed inward by applying an external force so as to be deformed beyond the elastic limit (yield) point, and is plastically deformed so that the volume of the vacuum space 43 is reduced. 48 is configured. The plastic deformation portion 48 has a strength to maintain the state of bulging outward as shown in FIG. 17A in a state before applying an external force including during vacuum evacuation. An exhaust hole 49 is provided in the center of the plastic deformation portion 48, and the tip tube 50 is joined to the exhaust hole 36 by welding.

  The inner body 51 of the inner container 42 has a diameter smaller than that of the outer body so that a predetermined gap is formed with respect to the outer body 44. One end of the inner body 51 is provided with a second opening 52 communicating with the inside. Further, a bottom mounting flange portion 53 having an opening area larger than that of the second mouth portion 52 is provided at the other end of the inner body 51. The inner bottom body 54 closes the bottom of the inner body 51 and includes a cylindrical portion 55 having an outer diameter substantially the same as the bottom mounting flange portion 53 of the inner body 51, and a bottom mounting flange at the opening end of the cylindrical portion 55. A flange portion 56 is provided to be overlapped and joined to the portion 53.

  In order to manufacture the thermos, the inner body 51 and the inner bottom body 54 are joined, and then the inner container 42 is provided with a metal foil and a getter (not shown). Then, as shown in FIG. 17A, the second mouth part 52 of the inner container 42 is positioned on the lower side, inserted into the outer body 44 of the outer container 41, and superimposed on the inner side of the first mouth part 45. Let In this state, the mouth portions 45 and 52 are joined in a sealed state by TIG (Tungsten Inert Gas) welding using non-consumable tungsten as an electrode. Thereafter, after the core material 10B is disposed on the inner bottom body 54, the outer bottom body 47 is fitted into the open end of the outer body 44 and joined by welding.

  In the assembled double container before evacuation, an internal space having a sufficient gap is formed between the outer container 41 and the inner container 42. Moreover, although the core material 10B is disposed between the outer bottom body 47 of the outer container 41 and the inner bottom body 54 of the inner container 42, the core material 10B and the outer bottom body 47 are also sufficient. A gap is formed. Therefore, the internal space can be evacuated to a predetermined pressure without any trouble by connecting an exhaust device to the tip tube 50 of the double container.

  When the predetermined degree of vacuum is reached, the tip tube 50 is sealed and sealed. Finally, the plastic deformation portion 48 is pressed toward the vacuum space 43 by a pressing machine such as a press machine, and the plastic deformation portion 48 is immersed inward as shown in FIG. Thereby, the base material sheet 11B of the core material 10B located inside is compressed, and the plastic deformation portion 48 is substantially in contact with the spherical member 12B inside.

As in the fourth embodiment , the thermos manufactured in this way can make the distance between the plastic deformation portion 48 of the outer bottom body 47 and the inner bottom body 54 (the width of the vacuum space 43) constant. In addition, since the compression margin of the base sheet 11B made of the fibrous sheet formed by the plastic deformation portion 48 and the inner bottom body 54 as the opposing surfaces is substantially constant, the outer container 41 and the inner container 42 are made uniform by the base sheet 11B. Can be supported. As a result, the outer container 41 and the inner container 42 can be prevented from relatively moving. For this reason, it is possible to prevent the outer container 41 and the inner container 42 from interfering with each other to generate abnormal noise, and to prevent leaks from occurring in the mouth portions 45 and 52 that are joint portions. Therefore, the vibration resistance performance of the thermos can be improved.

In addition, even if it uses the core material 10C of 3rd Embodiment instead of the core material 10B of 2nd Embodiment for this thermos, the same effect | action and effect can be acquired. Moreover, when the support function of the outer container 41 and the inner container 42 is unnecessary, the core material 10A shown in the first embodiment and the core material 10E of the second reference example can be used.

Further, in the thermos, the core materials 10F and 10G of the third and fourth reference examples may be disposed between the outer body 44 of the outer container 41 and the inner body 51 of the inner container 42 instead of the metal foil. In this way, deformation due to external force applied to the outer body 44 by the spherical members 12F and 12G can be suppressed.

FIG. 18 shows another example of the fireproof safe of the vacuum double container 40B which is the vacuum double structure of the sixth embodiment using the core material 10D of the first reference example . This fireproof safe has substantially the same configuration as the thermos bottle shown in the fifth embodiment , and is greatly different in that a lid 57 and a lid fixing member 59 are provided in the mouth portions 45 and 52. The fireproof safe is wrapped so that the core material 10D of the first reference example contacts the outer peripheral portion of the inner container 42 while the core material 10D does not contact the outer container 41.

  The lid 57 is made of a ceramic board and includes a fitting portion 58 that fits inside the second mouth portion 52. The lid fixing member 59 is a flat plate made of stainless steel (SUS304) that is larger than the lid 57. The lid fixing member 59 fixes the lid 57 so as not to be detached by tightening a bolt with respect to a non-tightening portion 60 provided on the shoulder portion of the outer container 41.

  In this fireproof safe, after the inner body 51 and the inner bottom body 54 are joined, the core material 10D is wound around the inner container 42 and a getter is disposed. Thereafter, the inner container 42 is disposed inside the outer body 44 of the outer container 41, and the mouth portions 45 and 52 are joined to each other. Thereafter, the outer bottom body 47 is disposed at the open end of the outer body 44 and joined by welding, and then the air in the inner space is evacuated from the tip tube 50. In addition, it is preferable that core material 10D winds an outer peripheral part with a wire etc., and binds it. Further, a sufficient gap is formed between the core material 10D and the outer container 41 as illustrated.

  The fireproof safe manufactured in this way can reliably prevent radiant heat transfer and improve the heat insulation performance by the base sheet 11D1, 11D2 made of metal foil. Further, when the outer container 41 is exposed to a high temperature and the outer container 41 is deformed toward the inner container 42, the outer container 41 is prevented from coming into contact with the inner container 42 by abutting against the spherical member 12 </ b> D. 43 can be maintained. As a result, direct heat transfer from the outer container 41 to the inner container 42 can be prevented, so that the fireproof safe can be prevented from being crushed into an indeterminate shape so that the product stored in the inner container 42 cannot be taken out.

In this fireproof safe, the core materials 10E, 10F, and 10G of the second , third, and fourth reference examples may be disposed instead of the core material 10D of the first reference example . Of course, the core materials 10A, 10B, and 10C shown in the first, second, and third embodiments may be used. Further, instead of winding the core materials 10A to 10G around the outer peripheral portion of the inner container 42, the core materials 10A to 10G may be wound around the inner peripheral portion of the outer container 41. In this case, it is preferable to position the core materials 10 </ b> A to 10 </ b> G on the inner peripheral portion of the outer container 41 by disposing a spring ring larger than the inner diameter of the outer container 41.

  In addition, this invention is not limited to the structure of the said embodiment, A various change is possible. In particular, the manufacturing method of the core materials 10A to 10G of the present invention can be changed as desired. Moreover, the core materials 10A to 10G are not limited to the vacuum heat insulating panels 30A and 30B and the vacuum double containers 40A and 40B, and can be used for various vacuum double structures.

10A to 10G ... Core material 11A to 11G ... Base sheet 12A to 12G ... Spherical member 20 ... Lower fixing base 22 ... Spherical member disposition frame 25 ... Movable press frame 27 ... Water tank 30A, 30B ... Vacuum heat insulation panel (vacuum 2 Heavy structure)
31A, 31B ... Metal plate 34 ... Vacuum space 40A, 40B ... Vacuum double container (vacuum double structure)
41 ... Outer container 42 ... Inner container 43 ... Vacuum space

Claims (7)

  Between a pair of base sheets made of a fiber sheet having low thermal conductivity and elastically deformable, a large number of spherical members having high heat resistance and low thermal conductivity are harder than the base sheet. A core material characterized by   Inside the base sheet made of a fiber sheet having low thermal conductivity and elastically deformable, in the state where a large number of spherical members having high heat resistance and low thermal conductivity are harder than the base sheet, A core material characterized by being embedded in and disposed in. A plurality of spherical members having high heat resistance and low thermal conductivity and harder than the first base material sheet are scattered on the upper surface of the first base material sheet made of a fiber sheet having low thermal conductivity and elastically deformable. Arranged,
A second base sheet made of a fibrous sheet having low thermal conductivity and elastically deformable is disposed on the spherical member,
A spherical member is disposed between a pair of substrate sheets by fixing the first and second substrate sheets. A method for producing a core material, comprising: While immersing fibers with low thermal conductivity and elastically deformable in diluted adhesive, and interspersing many spherical members with high heat resistance and low thermal conductivity that are harder than the fibers, immerse them in the adhesive. ,
A method for producing a core material, characterized in that a base material sheet made of a fibrous sheet containing the spherical member is taken out from the adhesive and dried to embed and arrange the spherical member inside the base material sheet. A base sheet made of a fibrous sheet having low thermal conductivity and elastically deformable is disposed on the upper surface of the fixed base,
On the surface of the base sheet, disposed with a large number of spherical members that are harder than the base sheet and have high heat resistance and low thermal conductivity,
A method for producing a core material, comprising: pressing the base sheet with a movable frame from above to deform the base sheet and burying at least a part of the spherical member. In the vacuum double structure formed by evacuating the internal space formed between the first and second metal plates facing each other,
A vacuum double structure, wherein the core material according to any one of claims 1 and 2 is placed in contact with the opposing surface of each metal plate. In the vacuum double structure formed by evacuating the internal space formed between the first and second metal plates facing each other,
Wherein the one of the opposing surfaces of the first and second metal plates, vacuum double structure, characterized in that the core material is disposed in a state in contact according to any one of claims 1 and 2.

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