JP3528846B1 - Vacuum insulation material, and refrigeration equipment and cooling / heating equipment using the vacuum insulation material - Google Patents

Abstract

An object of the present invention is to provide a vacuum heat insulating material which has less wrinkles, hardly reduces gas barrier properties of a jacket material, and has excellent surface properties. A plurality of vertical dashed lines and a plurality of horizontal dashed lines are provided on a surface of a core material, and a solid line portion of a horizontal (vertical) dashed line is provided at a portion where the vertical (horizontal) dashed line is interrupted. Are provided in a dashed spindle-shaped groove 14 in a pattern such that the groove 14 enters. When this core material 12 is covered with a jacket material 13 and the inside of the jacket material 13 is evacuated, the jacket material 13 conforms to the shape of the groove 14 of the core material 12, but it is difficult to form a projection. Due to the stress concentration, the possibility that the gas barrier property of the jacket material 13 is reduced is reduced. Further, when the vacuum heat insulating material 11 is stored, moved, or the like, the protrusion on the surface of the vacuum heat insulator 11 rubs against the object, and a pinhole is generated in the protrusion, and the possibility that the gas barrier property of the outer cover material 13 is reduced is reduced. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum heat insulating material which requires heat insulation, for example, a heat insulating material for a refrigerator, a heat and cold container, a vending machine, an electric water heater, a vehicle, a house and the like. is there.

[0002]

2. Description of the Related Art In recent years, energy saving has been strongly demanded from the viewpoint of preventing global warming, and energy saving has become an urgent issue for household electric appliances. In particular, a heat insulating material having excellent heat insulating performance is demanded from the viewpoint of efficiently utilizing heat in a heat insulating and cooling device such as a refrigerator, a freezer, and a vending machine.

As a general heat insulating material, a fiber material such as glass wool or a foamed material such as urethane foam is used. However, in order to improve the heat insulating properties of these heat insulating materials, it is necessary to increase the thickness of the heat insulating material, and when there is a limit to the space where the heat insulating material can be filled and space saving or effective use of space is required, Not applicable.

Therefore, a vacuum heat insulating material has been proposed as a high performance heat insulating material. This is a heat insulating material in which a core material having a role of a spacer is inserted into an outer covering material having a gas barrier property and the inside is reduced in pressure to be sealed.

[0005] As a conventional vacuum heat insulating material, there is one in which a core material is provided with an indentation and an outer covering material is adapted to the shape of the indentation (for example, refer to Patent Document 1).

Hereinafter, the conventional vacuum heat insulating material will be described with reference to the drawings.

FIG. 7 is a plan view of a conventional vacuum heat insulating material. As shown in FIG. 7, the conventional vacuum heat insulating material 1 includes a core material 2 made of foam and an outer covering material 3 covering the core material 2. The core material 2 is embossed in the core material 2 and has grooves 4 which traverse the core material 2 continuously in a diagonal pattern or a cross pattern. The core material 2 is shown by cutting out a part of the outer covering material in the lower left part of the drawing.

The operation of the conventional vacuum heat insulating material having the above structure will be described below.

When the core material 2 is contracted when the core material 2 is covered with the jacket material 3 and the interior of the jacket material 3 is evacuated, the groove 4 is formed in the groove 4 of the jacket material 3 generated when the core material 2 contracts. The jacket material 3 fits into the embossed grooves 4 in the core 2, providing additional surface area for the excess to fit. Thereby, the vacuum heat insulating material 1 has an appearance with few wrinkles.

[0010]

[Patent Document 1] Japanese Patent Publication No. 2002-508495

[0011]

However, in the above-mentioned conventional vacuum heat insulating material 1, the groove 4 has a diagonal pattern or a cross pattern, and the groove 4 has intersections. Therefore, when the core material 2 contracts during vacuum evacuation, the outer covering material 3 concentrates at each of the four vertices facing the intersections of the grooves 4 and a protrusion is formed.

When the protrusions are formed, stress is concentrated on the protrusions, so that cracks occur in the metal foil, the metal vapor deposition portion, etc. constituting the jacket material 3, and the gas barrier property is deteriorated, and when the vacuum heat insulating material 1 is stored. There is a possibility that the protrusions on the surface of the vacuum heat insulating material 1 and the object are rubbed during movement or the like to form pinholes in the protrusions, and the gas barrier property of the jacket material 3 is deteriorated.

The present invention solves the above-mentioned problems of the prior art. By reducing wrinkles and further reducing the protrusions on the surface, the gas barrier property of the jacket material is less deteriorated and the vacuum heat insulating material is excellent in surface properties. The purpose is to provide.

[0014]

The invention according to claim 1 of the present invention comprises at least a core material and an outer covering material for covering the core material, and has grooves on at least one surface in at least two directions. At least one of the grooves is a broken line, and the grooves do not have an intersection. If the grooves have intersections,
If the core material contracts during evacuation, face the intersection of the groove 4
The outer cover material may be concentrated at each of the two vertices to form a protrusion, but if the intersection is not provided, the protrusion is unlikely to be formed, and a vacuum heat insulating material having excellent surface properties can be obtained.

Further, since it is difficult to form the protrusions, stress is not concentrated on the protrusions, which may cause cracks in the metal foil or the metal vapor deposition portion constituting the outer covering material to deteriorate the gas barrier property. Less. In addition, when the vacuum heat insulating material is stored or moved, the projection on the surface of the vacuum heat insulating material and the object are rubbed with each other to form a pinhole on the projection, which reduces the possibility that the gas barrier property of the outer covering material is deteriorated.

Therefore, it is possible to obtain a vacuum heat insulating material having excellent heat insulation performance reliability over time.

The invention according to claim 2 is the invention according to claim 1, wherein the depth of the groove is 3 mm or less.

When the groove becomes deep, if the groove extends to the end of the core material, a surplus portion of the outer covering material is generated at the intersection of the end side of the core material and the groove, and a protruding portion is easily formed on the outer covering material. By setting the depth of the groove to 3 mm or less, the protrusions are less likely to occur.

According to a third aspect of the present invention, in the invention according to the first or second aspect, the distance between the parallel grooves is 5 m.
It is m or more.

If the gap between the grooves is narrow, stress is concentrated on the outer covering material and a protrusion is likely to be formed. However, if the gap between the grooves is 5 mm or more, the protrusion is less likely to be formed.

[0021] The invention according to claim 4 is based on claims 1 to 3.
In the invention described in any one of the items, the outer covering material conforms to the shape of the groove provided in the core material. By fitting the outer covering material to the groove formed in the core material, the protrusion of the outer covering material is less likely to occur.

The invention according to claim 5 is the same as claims 1 to 4.
The core material in the invention described in any one of 1 to 3 is made of a fiber material.

Among the core materials used for the vacuum heat insulating material, when the fiber material is used, the shrinkage rate at the time of evacuation is large. Therefore, if the groove has an intersection, the protrusion of the outer covering material at that portion becomes large. Therefore, when the groove as described above is provided in the vacuum heat insulating material using the fiber material, a very large effect can be obtained.

The invention described in claim 6 is the same as claim 5
The fibrous material according to the invention described in 1. is molded using an inorganic binder.

When an inorganic binder is used, migration is likely to occur, and a core material having a soft inside may be obtained. Therefore, the contraction rate of the core material during vacuum evacuation becomes large, and therefore, when the groove has an intersection, the protrusion of the outer covering material at that portion becomes large. Therefore, when the groove as described above is provided in the vacuum heat insulating material using the inorganic binder, a very large effect can be obtained.

The invention according to claim 7 is an outer box,
An inner box is provided, the vacuum heat insulating material according to any one of claims 1 to 6 is arranged in a space formed by the outer box and the inner box, and foaming is performed in the space other than the vacuum heat insulating material. A refrigerating machine and a cold machine which are filled with a heat insulating material.

By using a vacuum heat insulating material having few protrusions and having excellent surface properties for a refrigerating machine and a cooling / heating machine, it is possible to obtain a refrigerating machine and a cooling / heating machine itself having excellent surface properties and good appearance.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a vacuum heat insulating material according to the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a plan view of a vacuum heat insulating material according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA 'of the vacuum heat insulating material of FIG. 3 is an enlarged view of the groove portion on the surface of the vacuum heat insulating material of FIG.

As shown in FIG. 1, the vacuum heat insulating material 11 of the present embodiment comprises a core material 12 and an outer covering material 13 that covers the core material 12, and the core material 12 has a groove 14. . Each groove 14
, The grooves 14 in the form of broken lines parallel to each other run in two directions (in this embodiment, two directions, a vertical direction and a horizontal direction), and do not have intersections with each other.

That is, in the groove 14, a plurality of parallel vertical broken line grooves 14 arranged so that the broken line broken portions are positioned in a zigzag shape, and the broken line broken portions are in a zigzag shape. A plurality of parallel lateral dashed grooves 1 arranged so as to be positioned
4 and the pattern in which the solid line portion of the horizontal broken line enters the part where the broken line in the vertical direction is broken, and the solid line part of the vertical broken line enters in the part where the broken line in the horizontal direction is broken. Has become. The core material 12 is shown by cutting out the outer cover material in the lower left part of the drawing.

The core material 12 is a glass fiber having an average fiber diameter of 3 μm and is solidified with boric acid as a binder.

An aqueous boric acid solution was sprayed on both surfaces of the glass fiber aggregate molded into a predetermined shape by a spraying device, and then 4
Press in a hot air circulation oven at 50 ° C for 20 minutes to obtain a thickness of 1
A core material 12 having a diameter of 2 mm and a density of 200 kg / m ³ was obtained.

At the time of press firing, the groove 14 is formed in the core material 12 by forming a groove shape having a predetermined shape on the upper and lower press plates or by attaching a wire mesh having a predetermined shape to the upper and lower press plates.
Turn on.

As shown in FIGS. 2 and 3, the groove 14 has an elongated rugby ball shape (spindle shape), the depth 15 of the deep portion of the groove 14 is 4 mm, and the width 16 of the maximum portion of the groove 14 is 2 mm.
The length 17 of the groove 14 is 4 mm, and the distance between the center lines of the groove 14 is 1
8 is 5 mm.

The pattern of the groove 14 is not particularly specified, and may be the entire surface of the vacuum heat insulating material 11 or a part that is considered to be effective, or a mixture of two or more kinds of patterns. .

The core material 12 is made of fiber material, powder material,
If it is a porous body such as a foam, it is not particularly specified.

For example, as a powder material, inorganic powder such as silica, pearlite or carbon black, or organic powder such as synthetic resin powder is solidified with a fiber binder or an inorganic or organic liquid binder. Materials can be used.

Known materials such as foamed resins such as urethane foam, phenol foam and styrene foam, or pulverized products thereof can be used.

The processing method of the groove 14 is the above-mentioned method or
Groove 14 is formed by molding core 12 in a grooved mold.
In addition to processing the groove when manufacturing the core material, such as attaching, stamping or hot pressing with a mold with a predetermined groove shape after manufacturing the core material,
There are some things such as carving the groove, but it is not specified.

Although various dimensions of the groove 14 are not particularly specified, the width 16 of the groove 14 is 10 mm or less.
The length 17 is preferably 100 mm or less. This is because if the area (or volume) of the groove portion becomes too large, the core material 1
2 and the vacuum heat insulating material 11 may be reduced in strength.

The outer covering material 13 is made of two laminated films by a three-sided seal.

Of the above two laminated films, 1
A linear low density polyethylene film (hereinafter referred to as LLDPE) is 50 μm as a heat-sealing layer, and an ethylene-polyvinyl alcohol copolymer film (hereinafter referred to as EVOH) having a thickness of 15 μm as a gas barrier layer has a thickness of 500 Å.
The aluminum-deposited film and the 12 μm-thick polyethylene terephthalate film (hereinafter referred to as PET) with a 500Å aluminum-deposited film bonded to each other on the aluminum-deposited surfaces, the LLDPE of the heat-sealing layer and the gas barrier. The layers of EVOH are dry laminated. In addition, for the other one, the heat fusion layer has a thickness of 50.
μm LLDPE with a gas barrier layer thickness of 6
The aluminum foil has a thickness of 25 μm, the protective layer has a thickness of 25 μm nylon, and the outermost layer has a thickness of 15 μm.

The outer covering material 13 has at least a gas barrier layer and a heat-sealing layer, and may be provided with a surface protective layer or the like if necessary.

As the gas barrier layer, a metal foil, a metal, an inorganic oxide, a plastic film vapor-deposited with diamond-like carbon, or the like can be used, but if it is used for the purpose of reducing gas permeation. It is not specified.

As the metal foil, foils of aluminum, stainless steel, iron and the like can be used, but they are not particularly specified.

The material of the plastic film which serves as a substrate for vapor deposition of the above-mentioned metals is not particularly specified, but polyethylene terephthalate, ethylene-vinyl alcohol copolymer resin, polyethylene naphthalate,
Vapor deposition on nylon, polyamide, polyimide, etc. is preferred.

Materials for metal deposition on the plastic film are aluminum, cobalt, nickel, zinc,
Copper, silver, or a mixture thereof is not particularly specified. The material for depositing the inorganic oxide on the plastic film is not particularly specified, such as silica or alumina.

As the heat-welding layer, a low-density polyethylene film, a chain low-density polyethylene film, a high-density polyethylene film, a polypropylene film, a polyacrylonitrile film, an unstretched polyethylene terephthalate film, an ethylene-vinyl alcohol copolymer film, Alternatively, a mixture thereof or the like can be used, but it is not particularly specified.

It is also possible to provide a surface protective layer on the outer surface of the gas barrier layer.

As the surface protective layer, a nylon film,
A polyethylene terephthalate film, a stretched product of a polypropylene film, or the like can be used. Further, if a nylon film or the like is provided on the outside, flexibility is improved, and bending resistance is improved.

The above films are laminated and used.

The bag shape of the outer cover material 13 is not particularly limited, such as a four-sided seal bag, a gusset bag, an L-shaped bag, a pillow bag, and a center tape seal bag.

The vacuum heat insulating material 11 was produced by inserting the core material 12 into the outer covering material 13 and reducing the pressure to 3 Pa to seal the inside.
The core material 12 was inserted so that the processed surface of the groove 14 was fitted to the aluminum vapor deposition surface side of the jacket material 13.

Further, in order to further improve the reliability of the vacuum heat insulating material 11, the core material 12 may be dried with water before the outer covering material 13 is inserted. Further, when the outer covering material 13 is inserted, the core material 12
It is also possible to use a getter substance such as a gas adsorbent or a water adsorbent.

The method of manufacturing the vacuum heat insulating material 11 is as follows.
First, the jacket material 13 is produced, and then the core material 1 is placed in the jacket material 13.
2 may be inserted and the inside may be decompressed and sealed, or the core material 12 and the outer covering material 13 made of a roll-shaped or sheet-shaped laminated film may be placed in a pressure-reducing tank to form a roll-shaped or sheet-shaped outer layer. The vacuum heat insulating material 11 is obtained by placing the covering material 13 along the core material 12 and then heat-sealing the covering material 13.
Alternatively, there is a method of manufacturing the vacuum heat insulating material 11 by directly depressurizing the inside of the outer covering material 13 into which the core material 12 is inserted to seal the outer covering material opening, and the like. It is not specified.

The thermal conductivity of the vacuum heat insulating material 11 as described above was 0.0029 W / mK. Also, the vacuum heat insulating material 11
When the dimensions of the groove 14 were measured after fabrication, the vacuum heat insulating material 1
1 has a thickness of 10 mm, and the depth 15 of the groove 14 is 3.2.
It became mm. The other dimensions were almost the same as the dimensions of the groove 14 formed in the core material 12.

The operation of the vacuum heat insulating material 11 configured as described above will be described below.

On the vapor deposition surface side of the vacuum heat insulating material 11, since the grooves 14 do not have intersections, the outer covering material 13 is not concentrated and no protruding portion is formed, and the surface property is excellent and the outer covering material 13 It was possible to obtain a vacuum heat insulating material having excellent heat insulation performance reliability without deterioration of gas barrier property. Furthermore, the exhaust time to reach 3 Pa was shorter than that of the core material without grooves.

(Second Embodiment) FIG. 4 is a plan view of a vacuum heat insulating material according to a second embodiment of the present invention.

As shown in FIG. 4, the vacuum heat insulating material 11A of the present embodiment comprises a core material 12A and an outer covering material 13 covering the core material 12A, and the core material 12A has two kinds of grooves 14A. is doing. One of the grooves is a line-shaped groove and is parallel to each other. The other is a broken line in a direction perpendicular to the solid line-shaped groove and has no intersections with each other.

That is, the groove 14A has a pattern in which the solid-line-shaped groove is inserted in the portion where the line of the broken-line-shaped groove is interrupted. The core material 12A is shown by cutting out a part of the outer cover material in the lower left part of the figure.

The core material 12A has the same specifications as those of the first embodiment, but the groove shape and pattern are different. The core material 12A had a density of 200 kg / m ³ and a thickness of 12 mm.

The covering material 13 is the same as that shown in the first embodiment.

The size of the groove 14A is 3 mm for the depth 15A,
The width of the solid line groove is 1 mm, the maximum width of the broken line is 1 mm,
The distance between the solid line-shaped grooves was 10 mm, and the distance between the center lines of the broken line-shaped grooves was 10 mm.

The depth of the groove is preferably 3 mm or less. It is desirable to measure the depth of the groove in the vacuum heat insulating material 11A, but it may be the depth of the groove in the core material 12A before vacuum evacuation.

The vacuum heat insulating material 11A was manufactured by inserting the core material 12A into the outer covering material 13, depressurizing the inside to 3 Pa, and sealing. The core material 12A was inserted so that the processed surface of the groove 14A fits on the aluminum vapor deposition surface of the jacket material 13.

The thermal conductivity of the vacuum heat insulating material 11A as described above was 0.0027 W / mK. In addition, vacuum insulation 1
When the dimension of the groove 14A was measured after 1A was manufactured, the thickness of the vacuum heat insulating material 11A was 10 mm, and the depth of the groove 14A was 1 mm.
5A became 2.5 mm. The other dimensions were almost the same as the dimensions of the groove 14A formed in the core material 12A.

The depth 15A of the deep portion of the groove 14A is 2.
5 mm, which means that the average depth of the groove is 2.5 mm, or the deepest depth is 2.5 m.
m or even one of the grooves has a depth of 2.5 m
m and so on.

Also, the depth measuring method is not particularly specified, such as using a thickness sensor, using a ruler, or using a caliper or a caliper.

In addition to the effect of the first embodiment, even if the groove extends to the end of the core material, no protrusion of the outer covering material is formed at the intersection of the edge of the core material and the groove.

(Third Embodiment) FIG. 5 is a plan view of a vacuum heat insulating material according to a third embodiment of the present invention.

As shown in FIG. 5, the vacuum heat insulating material 11B of the present embodiment comprises a core material 12B and an outer covering material 13 which covers the core material 12B, and the core material 12B has a groove 14B. .
The core material 12B is shown by cutting out a part of the covering material in the lower left part of the drawing.

The grooves 14B have broken lines in the three directions and do not have intersections with each other. In this embodiment, a plurality of parallel broken lines in the first direction are broken, a plurality of broken parallel lines in the second direction are broken, and a plurality of parallel broken lines in the third direction. The part where the line is broken overlaps with the pattern.

The core material 12B is made of urethane continuous foam, and after foaming, it is pressed with a press plate having a predetermined groove shape to form the groove shape. The density of the core material 12B is 35 kg / m.
³ and the thickness was 12 mm. Groove 14B is core material 1
Processed on both sides of 2B.

The jacket material 13 is similar to that shown in the first embodiment.

Regarding the dimensions of the groove 14B, the depth was 1.5 mm, the maximum width of the broken line was 1 mm, and the length was 20 mm.

The thermal conductivity of the vacuum heat insulating material 11B as described above was 0.0060 W / mK. In addition, vacuum insulation 1
When the dimension of the groove 14B was measured after 1B was manufactured, the core material 1
It was almost the same as the dimension of the groove 14B processed into 2B.

Since the jacket material 13 conforms to the shape of the groove 14B formed in the core material 12B, there is no wrinkle on the surface of the vacuum heat insulating material 11B, and the grooves 14B do not have intersections, so that the jacket is not formed. The vacuum heat insulating material 11B which is excellent in surface property without concentration of the material 13 and no protruding portion and has no deterioration of gas barrier property of the covering material and excellent in reliability of heat insulating performance with time.
I was able to get

(Fourth Embodiment) FIG. 1 is a plan view of a vacuum heat insulating material according to a fourth embodiment of the present invention.

As shown in FIG. 1, the vacuum heat insulating material 11C of the present embodiment comprises a core material 12C and an outer covering material 13 which covers the core material 12C, and the core material 12C has a groove 14C. .
The pattern of the groove 14C is similar to that shown in the first embodiment. The core material 12C is shown by cutting out a part of the outer cover material in the lower left part of the drawing.

The core material 12C is made by solidifying glass fibers having an average fiber diameter of 8 μm using a phenol resin, and three sheets having a thickness of 6 mm are stacked and used. The core material 12C had a density of 200 kg / m ³ and a thickness of 18 mm.

As the fiber material, inorganic fibers such as glass wool, glass fiber, alumina fiber, silica-alumina fiber, silica fiber, rock wool and silicon carbide fiber,
Alternatively, there are natural fibers such as cotton, organic fibers such as synthetic fibers such as polyester, nylon and aramid, and solidified products thereof. These fiber diameters are not particularly specified, but are preferably 0.1 to 10 μm.

When the fiber material is used for the core material 12C, it is possible to use the fiber as it is without solidifying it, or to solidify it without using a binder such as a papermaking method.

Also when solidifying with a binder, a dry method or a wet method is not particularly specified, and an inorganic or organic binder or the like can be used as the binder. Specifically, colloidal silica, alumina sol, water glass, gypsum, boric acid, metaboric acid, boron oxide,
Inorganic binders such as borax, phosphoric acid, aluminum monophosphate, sodium hexametaphosphate, sodium silicate, and alkyl silicates, or thermosetting of phenol resins, urea resins, melamine resins, xylene resins, furan resins, epoxy resins, etc. Resins, thermoplastic resins such as vinyl acetate and acrylic resins, or organic binders such as natural product adhesives, used by mixing them, or by diluting them with water or a known organic solvent It is also possible to do so.

When the binder is used, it is desirable that the binder concentration is such that the solid content of the binder is 20 wt% or less with respect to the core material. When the amount of the binder increases, there is concern that the amount of gas generated from the binder and the solid thermal conductivity may increase.
This is because the heat insulating performance of C may be adversely affected.

The density of the core material 12C is 100 kg / m ³ to 4
It is desirable to mold so that the pressure becomes 00 kg / m ³ ,
The densities may be different inside.

If the density is less than 100 kg / m ³ , it becomes difficult to maintain the shape of the molded body, and 400 kg / m ³
This is because if it becomes larger, the solid thermal conductivity becomes larger and the heat insulating performance of the vacuum heat insulating material 11C deteriorates.

The grooves 14C are formed on both surfaces of the core material 12C, and no groove is formed on the surface where the core materials are joined together. The depth of the groove 14C is 2 mm.

The jacket material 13 is the same as that shown in the first embodiment.

The vacuum heat insulating material 11C was manufactured by inserting three core materials 12C into the outer covering material 13, depressurizing the inside to 3 Pa, and sealing. A water adsorbent 19 made of calcium oxide was inserted together with the core material.

The thermal conductivity of the vacuum heat insulating material 11C as described above was 0.0040 W / mK. In addition, vacuum insulation 1
When the dimension of the groove 14C was measured after 1C was manufactured, the thickness of the vacuum heat insulating material was 16 mm, and the depth of the groove 14C was 1.8.
It became mm.

It was possible to obtain a vacuum heat insulating material 11C excellent in surface property, which was free from wrinkles on the surface and had no protrusions on the outer covering material, as compared with the vacuum heat insulating material 11C using fibers. .

(Fifth Embodiment) FIG. 1 is a plan view of a vacuum heat insulating material according to a fifth embodiment of the present invention.

As shown in FIG. 1, the vacuum heat insulating material 11D of the present embodiment comprises a core material 12D and an outer covering material 13 that covers the core material 12D, and the core material 12D has a groove 14D. .
The groove pattern is similar to that shown in the first embodiment. The core material 12D is shown by cutting out a part of the covering material in the lower left portion of the drawing.

The core material 12D is glass fiber having an average fiber diameter of 8 μm solidified with boric acid and has a thickness of 6 mm.
I used three of them in a stack. The density of the core material 12D is 2
It was 00 kg / m ³ and the thickness was 18 mm.

The grooves 14D are formed on both surfaces of the core material 12D, and no groove is formed on the surface where the core materials are joined together. The depth of the groove 14D is 2 mm.

The covering material 13 is the same as that shown in the first embodiment.

The vacuum heat insulating material 11D was manufactured by inserting three core materials 12D into the outer covering material 13 and depressurizing the inside to 3 Pa and sealing. A water adsorbent 19 made of calcium oxide was inserted together with the core material.

The thermal conductivity of the vacuum heat insulating material 11D as described above was 0.0030 W / mK. In addition, vacuum insulation 1
When the dimensions of the groove 14D were measured after 1D fabrication, the thickness of the vacuum heat insulating material 11D was 15 mm, and the depth of the groove 14D was 1.5 mm.

Since an inorganic binder was used for the core material 12D, it was possible to obtain a vacuum heat insulating material 11D which generated little gas and was excellent in heat insulating performance.

(Sixth Embodiment) FIG. 6 is a sectional view of a refrigerator according to a sixth embodiment of the present invention.

Reference numeral 20 is a refrigerator, 21 is a heat insulating box forming the refrigerator, and 11 is a vacuum heat insulating material. The vacuum heat insulating material 11 has the same structure as that shown in the first embodiment.

The heat insulating box body 21 has a vapor deposition surface, that is, a groove, of the vacuum heat insulating material 11 inside the box body constituted by an outer box 22 formed by press-molding an iron plate and an inner box 23 vacuum-formed by ABS resin via a flange. The vacuum heat insulating material 11 is arranged in advance so that the processed surface of 14 is attached to the box body.
The space other than 1 is foamed and filled with a hard urethane foam 24. The rigid urethane foam 24 uses cyclopentane as a foaming agent.

The heat-insulating box 21 is partitioned by a partition plate 26, and the upper part is a refrigerating chamber 27 and the lower part is a freezing chamber 28. A damper 29 is attached to the partition plate 26.

An evaporator 30 is arranged in the refrigerator 20,
The compressor 31, the condenser 32, and the capillary tube 33 are sequentially connected in an annular shape to form a refrigeration cycle. Isobutane, which is a refrigerant, is enclosed in the refrigeration cycle.

The evaporator 30 may be provided at two places, the refrigerating chamber 27 and the freezing chamber 28, and they may be connected in series or in parallel to form a refrigeration cycle.

A door body 25 is attached to the refrigerator 20, a vacuum heat insulating material 11 is arranged inside the door body 25, and a space other than the vacuum heat insulating material 11 is foamed and filled with a hard urethane foam 24. Has been done.

When the vacuum heat insulating material 11 is applied to the refrigerator 20, the vacuum heat insulating material 11 is attached to the outer box 22 side or the inner box 23 side of the space between the outer box 22 and the inner box 23 of the refrigerator 20 and other space is provided. In addition to the present embodiment in which the resin foam 24 is filled in, the heat insulation body obtained by integrally foaming the vacuum heat insulation body and the foamed resin body is arranged in the space between the outer box and the inner box of the refrigerator, or the door portion. It is not particularly specified whether it is used in the same manner as described above or used as a partition plate.

As the resin foam, phenol foam, styrene foam or the like can be used in addition to the hard urethane foam 24, but it is not particularly specified.

Further, for example, a foaming agent used for foaming the rigid urethane foam 24 is not particularly specified, but cyclopentane, isopentane, n-pentane, from the viewpoint of ozone layer protection and global warming prevention. Isobutane, n-butane, water (foaming carbon dioxide gas), azo compounds, argon and the like are preferable, and cyclopentane is particularly preferable from the viewpoint of heat insulating performance.

Further, the refrigerant used for the refrigerating machine and the cold / warm machine is not particularly specified, such as Freon 134a, isobutane, n-butane, propane, ammonia, carbon dioxide, water and the like.

The refrigerating machine and the cold machine are shown as representatives of machines which require heat insulation from -30 ° C, which is an operating temperature range, to room temperature. For example, a refrigerating machine or a refrigerator utilizing electronic cooling is used. Can also be used. It also refers to vending machines and other cold and warm equipment that uses hot and cold heat up to higher temperatures. It also includes equipment that does not require power, such as gas equipment or cooler boxes.

Furthermore, it can also be used for personal computers, jars, rice cookers and the like.

The power consumption of the thus constructed refrigerator 20 was measured and found to be 30% lower than that of the refrigerator without the vacuum heat insulating material 11, confirming the heat insulating effect.
Further, by applying the vacuum heat insulating material 11 having an excellent surface property, the surface property of the refrigerator is also excellent.

[0116]

As described above, the invention according to claim 1 of the present invention comprises at least a core material and a jacket material covering the core material, and has grooves on at least one surface in at least two directions. However, at least one of the grooves is a broken line, and the grooves do not have an intersection. If the grooves have intersections,
If the core material contracts during evacuation, face the intersection of the groove 4
The outer cover material may be concentrated at each of the two vertices to form a protrusion, but if the intersection is not provided, the protrusion is unlikely to be formed, and a vacuum heat insulating material having excellent surface properties can be obtained.

Further, since the protrusions are less likely to be formed, stress is not concentrated on the protrusions, which may cause cracks in the metal foil, the metal deposition portion, etc. constituting the outer covering material to deteriorate the gas barrier property. Less. In addition, when the vacuum heat insulating material is stored or moved, the projection on the surface of the vacuum heat insulating material and the object are rubbed with each other to form a pinhole on the projection, which reduces the possibility that the gas barrier property of the outer covering material is deteriorated.

Therefore, it is possible to obtain a vacuum heat insulating material having excellent heat insulation performance reliability over time.

The invention according to claim 2 is the invention according to claim 1, wherein the depth of the groove is 3 mm or less.

When the groove becomes deep, if the groove extends to the end portion of the core material, an excess portion of the outer covering material is generated at the intersection of the edge side of the core material and the groove, and a protruding portion is likely to be formed on the outer covering material. By setting the depth of the groove to 3 mm or less, the protrusions are less likely to occur.

According to a third aspect of the invention, in the invention according to the first or second aspect, the distance between the parallel grooves is 5 m.
It is m or more.

When the interval between the grooves is narrow, stress is concentrated on the outer covering material, and a protruding portion is easily formed. However, when the interval between the grooves is 5 mm or more, the protruding portion is less likely to be formed.

The invention described in claim 4 is the same as claims 1 to 3.
In the invention described in any one of the items, the outer covering material conforms to the shape of the groove provided in the core material. By fitting the outer covering material to the groove formed in the core material, the protrusion of the outer covering material is less likely to occur.

The invention described in claim 5 is from claim 1 to claim 4.
The core material in the invention described in any one of 1 to 3 is made of a fiber material.

Among the core materials used for the vacuum heat insulating material, when the fiber material is used, the shrinkage rate at the time of evacuation is large. Therefore, if the groove has an intersection, the projection of the outer covering material at that portion becomes large. Therefore, when the groove as described above is provided in the vacuum heat insulating material using the fiber material, a very large effect can be obtained.

The invention described in claim 6 is the same as claim 5
The fibrous material according to the invention described in 1. is molded using an inorganic binder.

When an inorganic binder is used, migration is likely to occur, and a core material having a soft inside may be obtained. Therefore, the contraction rate of the core material during vacuum evacuation becomes large, and therefore, when the groove has an intersection, the protrusion of the outer covering material at that portion becomes large. Therefore, when the groove as described above is provided in the vacuum heat insulating material using the inorganic binder, a very large effect can be obtained.

According to the invention described in claim 7, an outer box,
An inner box is provided, the vacuum heat insulating material according to any one of claims 1 to 6 is arranged in a space formed by the outer box and the inner box, and foaming is performed in the space other than the vacuum heat insulating material. A refrigerating machine and a cold machine which are filled with a heat insulating material.

By using a vacuum heat insulating material having few protrusions and having excellent surface properties for a refrigerating machine and a cooling / heating machine, it is possible to obtain a refrigerating machine and a cooling / heating machine itself having excellent surface properties and good appearance.

[Brief description of drawings]

FIG. 1 is a plan view of a vacuum heat insulating material according to a first embodiment, a fourth embodiment and a fifth embodiment of the present invention.

FIG. 2 is a sectional view of the vacuum heat insulating material according to the first embodiment of the present invention.

FIG. 3 is an enlarged view of a groove portion of the vacuum heat insulating material according to the first embodiment of the present invention.

FIG. 4 is a plan view of a vacuum heat insulating material according to the second embodiment of the present invention.

FIG. 5 is a plan view of a vacuum heat insulating material according to the third embodiment of the present invention.

FIG. 6 is a schematic sectional view of a refrigerator according to a sixth embodiment of the present invention.

FIG. 7 is a plan view of a conventional vacuum heat insulating material.

[Explanation of symbols] 11, 11A, 11B, 11C, 11D Vacuum insulation 12, 12A, 12B, 12C, 12D core material 13 Outer material 14,14A, 14B, 14C, 14D groove 15 Deep groove depth 18 Spacing between center lines of grooves 20 refrigerator 22 Outer box 23 Inner Box 24 rigid urethane foam

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16L 59/00-59/22 F25D 23/02-23/08

Claims (7)

(57) [Claims] 1. A groove comprising at least a core material and an outer covering material covering the core material, and having grooves on at least one surface in at least two directions, and one or more of the grooves are broken lines, and the grooves are adjacent to each other. A vacuum heat insulating material characterized by having no intersection. 2. The vacuum heat insulating material according to claim 1, wherein the depth of the groove is 3 mm or less. 3. The vacuum heat insulating material according to claim 1, wherein the distance between the parallel grooves is 5 mm or more. 4. The vacuum heat insulating material according to claim 1, wherein the outer covering material conforms to the shape of the groove provided in the core material. 5. The vacuum heat insulating material according to claim 1, wherein the core material is a fiber material. 6. The vacuum heat insulating material according to claim 5, wherein the fiber material is molded using an inorganic binder. 7. An outer box and an inner box are provided, and a space formed by the outer box and the inner box is provided.
The vacuum heat insulating material according to any one of claims 1 to 3 is arranged, and the space other than the vacuum heat insulating material is filled with a foam heat insulating material.