JP2018044668A - Vacuum heat insulation material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce heat bridge of an outer cover material of a vacuum heat insulating material. SOLUTION: A first fibrous body, a second fibrous body arranged on an outer peripheral portion of the first fibrous body and thinner than an inner peripheral portion, and an outer side wrapping the first fibrous body and the second fibrous body. The material to be covered and the provided vacuum heat insulating material are used. Further, as the second fiber body, the vacuum heat insulating material which is different from the first fiber body is used. Further, the vacuum heat insulating material integrated with the second fiber body and the first fiber body is used. Further, the second fiber body is larger in the plane direction than the first fiber body, and the vacuum heat insulating material in which the second fiber body is sandwiched between the first fiber bodies is used. [Selection diagram] Fig. 1

Description

  The present invention relates to a vacuum heat insulating material or a device to which a vacuum heat insulating material is applied.

  In order to maintain the heat insulation performance of the vacuum insulation material over a long period of time, by using a film with excellent gas barrier properties for the jacket material, it prevents gas from entering from the outside and maintains the degree of vacuum inside the vacuum insulation material. There is a need to.

  For this reason, conventionally, a film containing a metal foil such as an aluminum foil has been widely used as the covering material. However, when a film including a metal foil is used as a vacuum heat insulating material, heat wraps around the metal foil (heat bridge) occurs, and thus there is a problem that the original heat insulating performance cannot be obtained.

  In order to solve this heat bridge phenomenon, instead of an aluminum foil layer, a method using a stainless foil layer having a relatively low thermal conductivity, a method using a ceramic vapor deposited film layer, and an aluminum vapor deposited film layer are used as a barrier layer. Methods are known.

  Furthermore, as in Patent Document 1, in consideration of both gas barrier properties and heat bridge, the outer cover material on either the front or back side of the vacuum heat insulating material is a laminated film having an aluminum foil layer as a gas barrier layer in its constituent layers Is used. As the other jacket material, there is a type in which a laminated film having at least two barrier film layers each having a multilayer inorganic oxide vapor deposition layer as a gas barrier layer is used.

Japanese Patent No. 46649969

  However, in patent document 1, although the heat bridge is reduced, the ratio is small. Therefore, the heat bridge is not improved sufficiently. Furthermore, the smaller the size of the vacuum heat insulating material, the more prominent the influence of the heat bridge is, and further reduction is necessary.

  This invention solves the said conventional subject, and further reduces the heat bridge of the jacket material of a vacuum heat insulating material.

  In order to achieve the above object, the first fiber body, the second fiber body disposed on the outer peripheral portion of the first fiber body and having a thickness smaller than the inner peripheral portion, the first fiber body and the second fiber body, And the provided vacuum heat insulating material.

  Moreover, the said 2nd fiber body uses the said vacuum heat insulating material which is a different body from the said 1st fiber body.

  Moreover, the said 2nd fiber body and the said 1st fiber body use the said vacuum heat insulating material integrated.

  According to the present invention, the heat bridge performance of the vacuum heat insulating material is improved by reducing the heat bridge of the vacuum heat insulating material, and the heat insulation and cold insulation equipment and the office equipment to which the vacuum heat insulating material is applied can be saved.

Sectional drawing of the vacuum heat insulating material in Embodiment 1 The perspective view of the vacuum heat insulating material in Embodiment 1 The figure which shows the manufacture flowchart of the vacuum heat insulating material in Embodiment 1. FIG. The figure explaining the manufacturing process of the vacuum heat insulating material in Embodiment 1 (a)-(d). Sectional drawing of the vacuum heat insulating material in Embodiment 2 The figure which shows the manufacture flowchart of the vacuum heat insulating material in Embodiment 2. The figure explaining the manufacturing process of the vacuum heat insulating material in Embodiment 2 (a)-(d). Sectional drawing of the vacuum heat insulating material in Embodiment 3 The figure which shows the manufacture flowchart of the vacuum heat insulating material in Embodiment 3. The figure explaining the manufacturing process of the vacuum heat insulating material in Embodiment 3 (a)-(d). Sectional drawing of the vacuum heat insulating material in Embodiment 4. The figure which shows the manufacture flowchart of the vacuum heat insulating material in Embodiment 4. The figure explaining the manufacturing process of the vacuum heat insulating material in Embodiment 4 (a)-(d). Sectional drawing of the vacuum heat insulating material in Embodiment 5

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

(Embodiment 1)
FIG. 1 is a cross-sectional view of the vacuum heat insulating material in Embodiment 1 of the present invention, and FIG. 2 is a perspective view of the vacuum heat insulating material in Embodiment 1 of the present invention.

<Structure>
In FIG. 1, the vacuum heat insulating material 11 includes an outer covering material 12, a first fiber body 13, a second fiber body 14, and an adsorbent 15. The dimension 16 represents the protruding length of the second fibrous body 14.

  The jacket material 12 maintains the degree of vacuum of the vacuum heat insulating material 11, and is formed by vapor deposition of an innermost layer of a heat-welding low-density polyethylene film and aluminum as a barrier layer that suppresses the penetration of gas and moisture. The polyacrylic acid resin film and the PET film formed by vapor deposition of aluminum and a nylon film as the outermost layer protection are provided.

  The heat welding film is not particularly specified, but a thermoplastic resin such as a low density polyethylene film, a linear low density polyethylene film, a high density polyethylene film, a polypropylene film, a polyacrylonitrile film, or a mixture thereof is used. Can be used.

  Gas barrier films include metal foils such as aluminum foil and copper foil, base materials such as polyethylene terephthalate films and ethylene-vinyl alcohol copolymer films, metals such as aluminum and copper, and metal oxides such as alumina and silica. The film etc. which vapor-deposited the thing can be used.

  Moreover, as a surface protective film, conventionally well-known materials, such as a nylon film, a polyethylene terephthalate film, a polypropylene film, can be used. The thickness is about 0.1 mm.

  The first fiber body 13 and the second fiber body 14 sandwich the second fiber body 14 having one rectangular parallelepiped shape between the first fiber bodies 13 having two rectangular parallelepiped shapes. The second fiber body 14 is larger than the first fiber body 13 in plan view. Therefore, the second fiber body 14 protrudes from the periphery of the first fiber body 13 in plan view.

  Both the 1st fiber body 13 and the 2nd fiber body 14 support the jacket material 12, and are a molded object comprised from glass fiber. In addition, the material with low heat conductivity is used as a material of the 1st fiber body 13 and the 2nd fiber body 14, and what was used as the foam, the granular material, and the fiber body can be utilized. For example, examples of the foam include open-cell urethane foam, styrene foam, and phenol foam. Examples of the powder body include inorganic and organic materials, and those obtained by pulverizing various foam materials, silica, alumina, pearlite, and the like. Examples of the fiber body include inorganic and organic materials, and examples thereof include glass fiber, glass wool, rock wool, and cellulose fiber.

  Moreover, as a material employ | adopted as the 1st fiber body 13 and the 2nd fiber body 14, you may make it employ | adopt foams, such as a urethane foam with comparatively low heat capacity, or this granular material. Furthermore, you may make it mix and use the above-mentioned various foams, a granular material, and a fiber body.

  Further, different materials may be used for the first fiber body 13 and the second fiber body 14.

  Further, in the first embodiment, the first fiber body 13 and the second fiber body 14 are configured as separate members. However, the same shape is created by removing the first fiber body 13 from the first fiber body 13. It may be a molded body.

  The adsorbent 15 is for suppressing an increase in the gas heat conduction component due to the intrusion of gas or water vapor, and is composed of zeolite, calcium oxide, or the like. It arrange | positions at the corner | angular part of the 1st fiber body 13, and seals it under reduced pressure with the 1st fiber body 13. The adsorbent 15 is not an essential element and is preferably used.

<Effect>
In manufacturing the vacuum heat insulating material 11, the bag-shaped outer covering material 12 is first manufactured by thermally welding the three sides of the outer covering material 12. For this reason, a margin is provided in the dimension of the place where the jacket material 12 overlaps so that the first fiber body 13 can be inserted later. By putting the second fibrous body 14 in the center using this margin, it is possible to lengthen the heat transfer path of the jacket material 12 and reduce the heat bridge of the jacket material 12.

  The thicker the second fibrous body 14 is, or the longer the protruding dimension 16 is, the more pronounced the effect of reducing the heat bridge of the jacket 12. On the other hand, from the viewpoint of practical use, in the present embodiment, the protruding dimension 16 of the second fibrous body 14 is desirably about 5 mm to 10 mm. Moreover, since the fin part (part shown by the dimension 16) of the outer covering material 12 is bent and used, the thickness is desirably about 2 mm so that the second fibrous body 14 can be bent.

<Manufacturing method>
The manufacturing method of the vacuum heat insulating material 11 is demonstrated.

  FIG. 3 is a manufacturing flowchart. FIG. 4 is a plan view for explaining a manufacturing process corresponding to the manufacturing flowchart of FIG.

Step 1, FIG. 4A is to weld three sides of the jacket material 12. As the jacket material 12, the following three layers are laminated. A low-density polyethylene film for heat welding of the innermost layer, a polyacrylic acid resin film formed by vapor deposition of aluminum as a barrier layer for suppressing permeation of gas and moisture, and a PET film formed by vapor deposition of aluminum A double-layer structure and a three-layer structure provided with a nylon film as the outermost layer protection were used.
The bag-like outer covering material 12 is manufactured by heat-welding one side of the laminated sides facing each other of the laminated film cut into a rectangular shape, and then fusing the other side.

  Step 2, FIG. 4B is the production of the first fiber body 13 and the second fiber body 14. After the glass fiber sheet is formed by heat compression, the glass fiber sheet is cut into a use size, and two first fiber bodies 13 and one second fiber body 14 are obtained. Then, the second fiber body 14 is disposed between the two first fiber bodies 13.

  Step 3, FIG. 4 (c) is to insert the first fibrous body 13 and the adsorbent 15 into the jacket bag. The first fiber body 13 and the second fiber body 14 are integrated, and the jacket material 12 is inserted together with the adsorbent 15.

  Step 4, FIG. 4 (d) is to vacuum and weld the opening. An unsealed vacuum heat insulating material is installed in the chamber, and the inside is decompressed to 10 Pa or less, and then the opening is thermally welded to obtain the vacuum heat insulating material 11.

  As a result, as for the vacuum heat insulating material 11, the outer periphery of the side is laminated | stacked and the upper and lower jacket materials 12 are joined. The second fibrous body 14 is covered with the upper and lower jacket materials 12 on the inner periphery thereof. In the innermost periphery, the first fibrous body 13 is covered with the upper and lower jacket materials 12.

<Evaluation>
Next, the effect of Embodiment 1 of the present invention was confirmed by simulation. The simulation conditions are shown in Table 1, and the simulation results are shown in Table 2. In addition, the temperature difference of the upper and lower surfaces of the vacuum heat insulating material 11 was set to 20K, the boundary condition of the side surface was set to heat insulation, and was set not to consider radiation. Further, both of the jacket materials 12 were made of aluminum vapor deposition having the best performance.

  What was described as the comparative example of the upper stage shown in Table 1 and Table 2 respond | corresponds to the existing vacuum heat insulating material. What is described as a lower example corresponds to the vacuum heat insulating material 11 of the present embodiment. The comparative example and the example are assumed to have the same core thickness of 10 mm, and the internal configuration is different. In contrast to one of the 10 mm first fiber bodies 13 of the comparative example, the example is composed of two sheets of 4 mm first fiber bodies 13 and one sheet of 2 mm second fiber bodies 14.

  The results obtained by the simulation are as shown in Table 2. In the comparative example, the amount of heat passing through the unit area of the jacket material 12 is 0.4 W. On the other hand, in this embodiment, the amount of heat passing through the unit area of the jacket material 12 is 0.2 W.

  That is, in the vacuum heat insulating material 11 of the example, the heat bridge of the jacket material 12 was improved by 50% compared to the comparative example. In addition, this result is an evaluation result about the case where the sheet | seat which formed aluminum into a film by vapor deposition was used for the intermediate | middle layer in which the thermal conductivity of an in-plane direction becomes low as the jacket material 12. FIG. In the case where an aluminum foil is used as the intermediate layer of the jacket material 12, this is further improved.

(Embodiment 2)
FIG. 5 is a cross-sectional view of the vacuum heat insulating material in Embodiment 2 of the present invention.

<Structure>
The vacuum heat insulating material 41 of the second embodiment is different from the vacuum heat insulating material 11 of the first embodiment in that the second fiber body 44 has a hollow shape. Matters not described are the same as those in the first embodiment.

  The second fiber body 44 has a frame shape and a square hollow. The first fiber body 43 is inserted into the hollow portion.

<Effect>
In addition to the effects of the first embodiment, there are the following effects.

  The second fiber body 44 is fitted into the hollow portion of the first fiber body 43. The second fiber body 44 is fitted into the hollow portion of the first fiber body 43 and does not enter the first fiber body 43. For this reason, when it implements, the part of the 2nd fiber body 44 is easy to change with respect to the 1st fiber body 43, and is easy to use it.

<Manufacturing method>
A method for manufacturing the vacuum heat insulating material 41 will be described.

  The manufacturing flow is shown in FIG. 6, and the manufacturing process at that time is shown in FIGS. 7 (a) to 7 (d). The manufacturing flow is the same as in the first embodiment. Only the differences will be described. Step 2, the creation of the core material of FIG. 7B is different in that the second fiber body 44 is fitted to the center of the first fiber body 43.

  The rest is the same as the manufacturing method of the first embodiment.

(Embodiment 3)
FIG. 8 is a cross-sectional view of the vacuum heat insulating material in Embodiment 3 of the present invention.

<Structure>
The vacuum heat insulating material 61 of the third embodiment is different from the vacuum heat insulating material 11 of the first embodiment in that the second fiber body 64 is positioned at the bottom of the first fiber body 63. Matters not described are the same as those in the first embodiment.

<Effect>
The second fiber body 64 is larger than the first fiber body 63 in plan view. For this reason, the heat transfer path of the jacket material 12 becomes longer, and the heat bridge of the jacket material 12 can be reduced. Moreover, since the 2nd fiber body 64 is a structure located in the lowest part of the 1st fiber body 13, it is easy to manufacture.

<Production method>
A method for manufacturing the vacuum heat insulating material 61 will be described.

  The manufacturing flow is shown in FIG. 9, and the manufacturing process at that time is shown in FIGS. 10 (a) to 10 (d). The order is different from the manufacturing flow of the first embodiment. Matters not described are the same as in the manufacturing method of the first embodiment.

  Step 1, FIG. 10A is the production of the first fiber body 63 and the second fiber body 64. After the glass fiber sheet is formed by heat compression, the glass fiber sheet is cut into a use size, and two first fiber bodies 63 and a second fiber body 64 are obtained.

  In Step 2 and FIG. 10B, the first fiber body 63 and the second fiber body 64 are disposed between the two jacket materials 12 together with the adsorbent 15.

  Step 3, FIG. 10 (c), the three sides of the jacket material 12 are welded.

Step 4, FIG. 10 (d) is to vacuum and weld the opening. An unsealed vacuum heat insulating material is installed in the chamber, and after the inside is depressurized to 10 Pa or less, the opening is thermally welded to obtain the vacuum heat insulating material 61.
(Embodiment 4)
FIG. 11 is an example of a cross-sectional view of a vacuum heat insulating material according to Embodiment 4 of the present invention.

<Structure>
The vacuum heat insulating material 81 of the fourth embodiment is different from the vacuum heat insulating material 11 of the first embodiment in the second fiber body 84.

  The second fibrous body 84 has a strip shape or a plate shape. The second fibrous body 84 is sandwiched or embedded in at least one of the four side surfaces of the first fibrous body 83. FIG. 11 is a cross-sectional view in which two second fiber bodies 84 a and 84 b are sandwiched or embedded between two opposing surfaces of the first fiber body 13. The second fiber bodies 84 a and 84 b have one end located inside the first fiber body 83 and the other end located outside the first fiber body 13. Matters not described are the same as those in the first embodiment.

  The second fibrous body 84 may be not only two surfaces but also one surface, three surfaces, and four surfaces. Furthermore, there may be a plurality of second fibrous bodies 84 instead of one per side.

  The second fibrous body 84 may not be the center of the surface, but may be the lower portion or the upper portion of the surface.

<Effect>
In this structure, since the second fibrous body 84 is provided, a convex portion is formed on the side surface of the vacuum heat insulating material 11. By this convex portion, the heat transfer path of the jacket material 12 becomes longer, and it becomes possible to reduce the heat bridge of the jacket material 12.

<Production method>
A method for manufacturing the vacuum heat insulating material 81 will be described with reference to FIGS.

  A manufacturing flow is shown in FIG. The manufacturing process is shown in FIG. The manufacturing flow and manufacturing process are the same as those in the first embodiment. Only the differences will be described. In creating the core material of Step 2 (FIG. 12B), the second fiber body 84 is sandwiched between at least one of the four sides of the first fiber body 83.

Here, there are two methods for sandwiching. The first is to form a recess in the first fibrous body 13 and insert the second fibrous body 84. The second is a method in which a cut is made in the center of the first fiber body 13 in the thickness direction, and the second fiber body 84 is cut into the cut portion. In this case, the thickness of the vacuum heat insulating material 81 in the portion into which the second fibrous body 84 is inserted becomes thick, and the heat insulating performance is high. The second method is preferred.
A vacuum heat insulating material 81 is obtained. FIG. 12 is a manufacturing flow in which the second fiber body 84 is sandwiched between the ends of the two sides of the first fiber body 13.

(Embodiment 5)
FIG. 14 is an example of a cross-sectional view of the vacuum heat insulating material 11 according to Embodiment 1 of the present invention. The difference from the first embodiment is that the dimension 16 is bent.

  The dimension 16 is a portion of the second fiber body 14 located in the peripheral portion of the first fiber body 13. This part is a part discharged from the vacuum heat insulating material 11 and becomes an obstacle when the vacuum heat insulating material 11 is arranged in various devices. When the portion of the dimension 16 is bent toward the first fiber body 13 side, it becomes a rectangular parallelepiped shape, which is easy to arrange in equipment.

  In addition, the dimension 16 can be similarly bent also in the vacuum heat insulating materials of Embodiment 2-4.

(as a whole)
The embodiments can be combined. In addition, this invention is applicable also to heat insulating materials other than a vacuum heat insulating material.

As described above, the vacuum heat insulating material according to the present invention can be applied not only to a heat and cold insulation device that requires energy saving, but also to uses such as a container box and a cooler box that need to be kept cold. In addition, since the heat insulation performance can be maintained even if the vacuum heat insulating material is small and thin, it can be applied not only to office equipment but also to electronic equipment and applications requiring moisture retention such as cold protection equipment and bedding. .

DESCRIPTION OF SYMBOLS 11 Vacuum heat insulating material 12 Cover material 13 1st fiber body 14 2nd fiber body 15 Adsorbent 16 Size 41 Vacuum heat insulating material 43 1st fiber body 44 2nd fiber body 61 Vacuum heat insulating material 63 1st fiber body 64 2nd fiber Body 81 Vacuum heat insulating material 83 First fiber body 84, 84a, 84b Second fiber body 91 Vacuum heat insulating material

Claims (14)

A first fibrous body;
A second fibrous body disposed on the outer periphery of the first fibrous body and having a thickness smaller than the inner peripheral part;
A jacket material for wrapping the first fiber body and the second fiber body;
Vacuum insulation provided. The vacuum heat insulating material according to claim 1, wherein the second fiber body is separate from the first fiber body. The vacuum heat insulating material according to claim 1, wherein the second fiber body and the first fiber body are integrated. The second fibrous body is larger in the surface direction than the first fibrous body,
The vacuum heat insulating material according to claim 1 or 2, wherein the second fiber body is sandwiched between the first fiber bodies. The second fiber body is larger in the surface direction than the first fiber body,
The vacuum heat insulating material according to claim 1, wherein the vacuum heat insulating material is disposed on one surface of the first fibrous body. The vacuum heat insulating material according to claim 1 or 2, wherein the second fiber body has a frame shape and is disposed on a side surface of the first fiber body. The vacuum heat insulating material according to claim 1 or 2, wherein one end of the second fiber body is embedded in at least one surface of the first fiber body, and the other end is located outside the first fiber body. The vacuum heat insulating material according to claim 7, wherein there is one first fiber body and a plurality of second fiber bodies. The vacuum heat insulating material according to claim 8, wherein the plurality of second fiber bodies are disposed on different surfaces of the first fiber body. The vacuum heat insulating material according to any one of claims 1 to 9, wherein the first fiber body and the second fiber body are inorganic fiber bodies. The vacuum heat insulating material according to any one of claims 1 to 10, wherein the second fiber body is made of an inorganic fiber body, ceramic, or resin. The said jacket material is a vacuum heat insulating material of any one of Claim 1 to 11 which wraps an adsorbent with a 1st fiber body and a 2nd fiber body. The outer cover material is composed of two sheets, and the two outer cover materials are often above and below the vacuum heat insulating material.
The vacuum heat insulating material according to any one of claims 1 to 12, wherein the two outer cover materials are joined together at an outer peripheral portion of the vacuum heat insulating material. FIG.
The said vacuum heat insulating material of any one of Claims 1-13 which bent the said 2nd fiber body located in the outer peripheral part of a said 1st fiber body.

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