JP2019049328A - Multilayer heat insulating material - Google Patents

Abstract

To provide a multilayer heat insulating material capable of suppressing deterioration of heat insulating performance of a double heat insulating wall.SOLUTION: A multilayer heat insulating material 20 according to this invention is installed in a space between an outer wall 11 and an inner wall 12 of a double heat insulating wall. The multilayer heat insulating material 20 includes a sheet like reflection film 21, and a spacer 22 keeping an interval between the reflection films 21 at a prescribed interval. The spacer 22 has an area in contact with the reflection film 21 smaller than the reflection film 21, and has an integral structure.SELECTED DRAWING: Figure 2

Description

  The present invention relates to multilayer insulation.

  As one of the heat insulating materials of the double heat insulating wall, a multilayer heat insulating material (Multiple Layer Insulation, MLI) in which reflective films and spacers are alternately stacked is generally used. Patent Document 1 discloses a multilayer heat insulating material in which reflective films and spacers are alternately stacked.

Japanese Patent Application Publication No. 07-127790

  As described in the background art, in general, a heat insulating material in which reflective films and spacers are alternately stacked is used for heat insulating using a double heat insulating wall. Usually, the shape of the spacer is formed as a sheet-like shape like the reflective film. However, if the contact area between the reflective film and the spacer is large, a heat conduction path can be formed from one wall of the double thermal insulation wall through the contact portion between the reflective film and the spacer to the other wall. , There is a problem that the heat insulation will be reduced.

  This invention is made in view of the said problem, and provides the multilayer heat insulating material which can suppress the heat insulation fall of a double heat insulation wall.

  The multilayer heat insulating material according to the present invention is installed in a space between the outer wall and the inner wall of the double heat insulating wall, and the heat insulating material is a sheet-like reflective film and a spacer for keeping the distance between the reflective films at a predetermined distance. The spacer has an area smaller than the reflective film and a contact area in contact with the reflective film smaller than the reflective film, and has an integral structure.

  In the multilayer heat insulating material according to the present invention, the contact area between the spacer and the reflective film is smaller than the area of the reflective film. Therefore, the heat conduction which arises by the contact with a reflective film and a spacer can be suppressed, and the heat insulation fall of the double heat insulation wall can be suppressed. Furthermore, when the spacer has an integral structure, the heat insulating material can be easily laminated, and the multilayer heat insulating material can be easily formed.

  ADVANTAGE OF THE INVENTION By this invention, the multilayer heat insulating material which can suppress the heat insulation fall of a double heat insulation wall can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a model perspective view which shows the external appearance of the heat insulation structure concerning embodiment. It is a schematic cross section of the heat insulation structure cut | disconnected in the dashed-dotted line of FIG. It is a model top view which shows an example of the shape of the heat insulating material concerning embodiment. It is a model perspective view of the multilayer heat insulating material concerning embodiment. It is a transparent perspective view of the heat insulation structure concerning an embodiment. It is a model top view which shows an example of the shape of the heat insulating material concerning embodiment. It is a model top view which shows an example of the shape of the heat insulating material concerning embodiment. It is a model top view which shows an example of the shape of the heat insulating material concerning embodiment. It is a model top view which shows an example of the shape of the heat insulating material concerning embodiment. It is a model top view which shows an example of the shape of the heat insulating material concerning embodiment. It is a model top view which shows an example of the shape of the heat insulating material concerning embodiment. It is a model top view which shows an example of the shape of the heat insulating material concerning embodiment. It is a model top view which shows an example of the shape of the heat insulating material concerning embodiment. It is a model top view which shows an example of the shape of the heat insulating material concerning embodiment.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Also, in order to clarify the explanation, the drawings are simplified as appropriate.
As a matter of course, the right-handed xyz coordinates shown in FIGS. 1 to 14 are convenient for describing the positional relationship of the components. Usually, the z-axis plus direction is vertically upward, and the xy plane is a horizontal plane, which is common to the drawings.

Embodiment
FIG. 1: is a model perspective view which shows the external appearance of the heat insulation structure 1 concerning embodiment. As shown in FIG. 1, the heat insulating structure 1 includes an outer wall 11, an inner wall 12, and a side wall 13. Furthermore, the inner space surrounded by the outer wall 11, the inner wall 12, and the side wall 13 is provided with a multilayer heat insulating material (not shown in FIG. 1). The heat insulation structure 1 is used, for example, for heat insulation of a heating furnace or a heat insulation container.

  The outer wall 11 of the heat insulation structure 1 is a wall which becomes a low temperature side at the time of heating. The outer wall 11 is, for example, a metal-based material such as aluminum, iron or stainless steel, and the thickness is preferably 3 mm or more. The inner wall 12 of the heat insulation structure 1 is a wall which becomes a high temperature side at the time of heating. The inner wall 12 and the side wall 13 are metal-based materials such as iron, stainless steel, aluminum, copper, nickel and the like. In addition, although the shape of the heat insulation structure 1 is shown as a rectangular parallelepiped in FIG. 1, it shall extend suitably in the positive direction of x-axis, y-axis, and z-axis as needed.

  FIG. 2: is a schematic cross section of the heat insulation structure 1 cut | disconnected in the dashed-dotted line of FIG. As shown in FIG. 2, the multilayer heat insulating material 20 is disposed in the space formed between the outer wall 11, the inner wall 12 and the side wall 13 of the heat insulating structure 1. The space is preferably vacuum. As shown in FIG. 2, the multilayer heat insulating material 20 includes a reflective film 21 and a spacer 22. In the present embodiment, the reflective films 21 and the spacers 22 are alternately stacked. The number of laminated layers of the reflective film 21 and the spacer 22 is preferably about 1 to 500, for example, according to the heating temperature, but can be appropriately changed according to the degree of heat insulation to be obtained.

  The reflective film 21 reflects radiant heat from the inner wall 12 side which is heated to a high temperature. The reflective film 21 is in the form of a sheet, and preferably has a thickness of about 10 μm to 30 μm. The material of the reflective film 21 is, for example, aluminum or copper.

The spacer 22 keeps the distance between the reflective films 21 at a predetermined distance. That is, the spacer 22 prevents contact between the reflective films 21 and prevents heat conduction due to contact between the reflective films 21. Furthermore, the spacer 22 has a smaller area than the reflective film 21 and is an integral structure. However, even if the area of the spacer 22 is a case where the reflective film 21 is deformed due to gravity or the like, the area and thickness can be such that the distance between the reflective films 21 can be maintained. Furthermore, the thickness of the spacer 22 is preferably about 100 μm. The material of the spacer 22 is, for example, glass fiber. The features of the spacer 22 described above are features common to the spacers 23 to 31 shown in FIGS. 6 to 14 described later.
A more specific shape of the spacer 22 will be described below with reference to FIG.

  FIG. 3: is a model top view which shows an example of the shape of the heat insulating material concerning embodiment. As shown in FIG. 3, the heat insulating material 20 a includes a reflective film 21 and a spacer 22. The spacer 22 has a square spiral shape. Each side of the spacer 22 is a straight line, and the length of each side is shorter than one side of the reflective film 21. The spacer 22 has a spiral shape in which each side is gradually shortened from the outer side toward the inner side. The area of the spacer 22 thus formed is smaller than the area of the reflective film 21. In addition, in FIG. 3, although it is a spiral shape which winds a vortex clockwise, it may be a spiral shape which winds a vortex counterclockwise.

  FIG. 4 is a schematic perspective view of the multilayer heat insulating material 20 according to the embodiment. As shown in FIG. 4, the heat insulating material 20 a is laminated so that the reflecting films 21 and the spacers 22 are alternately formed, with the heat insulating materials 20 a including the reflecting film 21 and the spacers 22 as a unit structure, to form a multilayer heat insulating material 20. The state in which the heat insulating material 20a is laminated is shown in the following FIG.

  FIG. 5 is a transparent perspective view of the heat insulating structure 1 according to the embodiment. In addition, although the shape of the heat insulation structure 1 which has the multilayer heat insulating material 20 is shown as a rectangular parallelepiped in FIG. 5, it shall extend suitably in the positive direction of x-axis, y-axis, and z-axis as needed.

  As in the prior art, in the case of heat insulation using a double heat insulation wall, when the spacer is formed as a single sheet similar to the reflection film, the contact area between the reflection film and the spacer becomes large, and the double heat insulation wall There is a problem that the heat insulating property is reduced because a heat conduction path can be formed from one wall to the other wall through the contact portion.

  In the present embodiment, the reflective film 21 and the spacer 22 are used, but the area of the spacer 22 is smaller than the area of the reflective film 21. Therefore, since the spacer 22 of the present embodiment can suppress the thermal conduction caused by the contact between the reflective film 21 and the spacer 22, it is possible to suppress the decrease in the heat insulating property of the multilayer heat insulating material 20. Furthermore, when the spacer 22 has an area smaller than that of the reflective film 21, an increase in the weight of the multilayer heat insulating material 20 can be suppressed.

  Furthermore, since the spacer 22 has an integral structure, it is easy to stack the reflective film 21 and the spacer 22. That is, since lamination | stacking of the heat insulating material 20a becomes easy, formation of the multilayer heat insulating material 20 becomes easy. Further, since the spacer 22 has an integral structure, it is difficult for the reflective film 21 and the spacer 22 to deviate when laminating the heat insulating material 20a, and the formation of the multilayer heat insulating material 20 becomes easy.

  Next, another configuration example of the spacer of the heat insulating material according to the embodiment will be described with reference to FIGS. As in the case of the spacer 22, the area of the spacers 23 to 31 is smaller than the area of the reflective film 21 and has an integral structure. Note that these modifications are merely examples, and the shape of the spacer is not limited to these modifications.

  FIG. 6 is a schematic plan view showing an example of the shape of the heat insulating material according to the embodiment. As shown in FIG. 6, the spacer 23 has a spiral shape. In FIG. 6, the spacers 23 have spiral shapes at equal intervals, such as an algebraic spiral (Archimedean spiral), but the spiral shapes do not necessarily have to be at equal intervals. The shape of the spiral includes, for example, a logarithmic spiral (a Bernoulli spiral), a parabolic spiral, or a hyperbolic spiral. However, the spacer 23 may have a spiral shape, even if it has a spiral shape other than the spiral shape that can be shown using such a general formula.

  FIG. 7 is a schematic plan view showing an example of the shape of the heat insulating material according to the embodiment. As shown in FIG. 7, the spacer 24 is in the shape of a serpentine curve. The spacer 24 is formed to meander from the upper right, but may be formed to meander from the upper left, and the number of meanders can be appropriately changed. Although the spacer 24 is shown using a curve in FIG. 7, the curve portion may be a straight line.

  FIG. 8 is a schematic plan view showing an example of the shape of the heat insulating material according to the embodiment. As shown in FIG. 8, the spacer 25 is in the shape of a serpentine curve. In order to turn back between the left side and the bottom side of the reflective film 21 and meander between the top side and the right side of the reflective film 21. In other words, the spacer 25 has a shape that meanders from the diagonal start point to the end point of the reflective film 21. Although the spacer 25 is shown using a curve in FIG. 8, the curve portion may be a straight line.

  FIG. 9 is a schematic plan view showing an example of the shape of the heat insulating material according to the embodiment. As shown in FIG. 9, the spacer 26 is cut out in a circle at a portion located at the central portion of the reflective film 21 and cut out at a curve at the end of the region radially extending outward from the circle. It is a shape. Although the number of radially extending regions of the spacer 26 is eight in FIG. 9, the number of regions is not particularly limited, and can be appropriately changed. Further, the outside of the region of the spacer 26 is also cut out similarly to the inside of the region. In FIG. 9, a part of the spacer 26 is shown using a curve, but the curve part may be a straight line.

  FIG. 10 is a schematic plan view showing an example of the shape of the heat insulating material according to the embodiment. As shown in FIG. 10, the spacer 27 is cut out in a circle at a portion located at the central portion of the reflective film 21 and cut out so that the end of the region radially extending outward from the circle is elliptical. It is a shape. Although the number of radially extending regions is eight in FIG. 10, the number of regions is not particularly limited, and can be changed as appropriate. Also, the outside of the area is cut out as well as the inside of the area. In FIG. 10, a part of the spacer 27 is shown using a curve, but the curve portion may be a straight line. In addition, the elliptical portion of the spacer 27 does not necessarily have to have an elliptical shape, and may have any shape such as a circle or a polygon.

  FIG. 11 is a schematic plan view showing an example of the shape of the heat insulating material according to the embodiment. As shown in FIG. 11, the outer frame of the spacer 28 has a shape similar to that of the reflective film 21, and further has a shape cut out leaving a diagonal portion. Note that, in FIG. 11, the four corners of the spacer 28 are formed by curves, but they need not be curves, and may be corners.

  FIG. 12 is a schematic plan view showing an example of the shape of the heat insulating material according to the embodiment. As shown in FIG. 12, the outer frame of the spacer 29 has a shape similar to that of the reflective film 21 and is further cut out leaving a cross shape (plus shape) connecting the central portions of each side. In FIG. 12, the four corners of the spacer 29 show curves, but they do not have to be curves, and may be corners. Further, in FIG. 12, the cut out portion of the spacer 29 is formed by a straight line or a corner, but the cut out shape may be a circle or a polygon.

  FIG. 13 is a schematic plan view showing an example of the shape of the heat insulating material according to the embodiment. As shown in FIG. 13, the outer frame of the spacer 30 has a shape similar to that of the reflective film 21. The central portion of the spacer 30 is cut out in a shape similar to the outer frame of the spacer 30, and in FIG. 13, the central portion is square. Furthermore, the four corners of the region between the outer frame of the spacer 30 and the cut-out square at the central portion are each cut out in an L shape. In other words, the central part of one side of the square located at the central part of the spacer 30 is connected to the central part of one side of the square of the outer frame of the spacer 30, and the other is cut out. In FIG. 13, the cut out portion of the spacer 30 is formed by straight lines and corners, but the cut out shape may be a circle or a curved line.

  FIG. 14 is a schematic plan view showing an example of the shape of the heat insulating material according to the embodiment. As shown in FIG. 14, the outer frame of the spacer 31 has a shape similar to the reflective film 21, and the spacer 31 has a shape cut out in a lattice shape. In FIG. 14, the number of cut-out portions of the spacer 31 is sixteen, but can be changed as appropriate. In FIG. 14, the cut out portion of the spacer 31 is formed by a square, but the cut out shape may be a circle or a polygon.

  As mentioned above, although the present invention was explained according to the above-mentioned embodiment, the present invention is not limited only to the composition of the above-mentioned embodiment, It is within the range of the invention of the claim of the present claim. Of course, it includes various modifications, modifications, and combinations that can be made by a vendor.

DESCRIPTION OF SYMBOLS 1 Heat insulation structure 11 Outer wall 12 Inner wall 13 Side wall 20 Multilayer heat insulating material 20a Heat insulating material 21 Reflective film 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 Spacer

Claims (1)

A multilayer insulation material installed in a space between an outer wall and an inner wall of a double insulation wall,
The multilayer heat insulating material includes a sheet-like reflective film, and a spacer for keeping the distance between the reflective films at a predetermined distance,
The spacer has an area in which a contact area in contact with the reflective film is smaller than that of the reflective film, and has an integrated structure.
Multilayer insulation.

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