JP3549453B2 - refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat insulating box that can be used for a refrigerator, a heat / cold storage, a vending machine, and the like.
[0002]
[Prior art]
In recent years, vacuum heat insulating materials having high heat insulating performance are one of the heat insulating materials being developed mainly by home appliance manufacturers and heat insulating material manufacturers in order to save energy and space.
[0003]
As an example of the vacuum heat insulating material, there is one in which a core material composed of hard urethane foam having open cells is covered with a gas barrier laminate film and the inside is decompressed, and a hard or soft urethane foam, or a resin foam Compared to, it has a heat insulation performance of about 2.5 times.
[0004]
However, if a resin foam or powder that is generally used is used as the core material of the vacuum heat insulating material, the resin foam has poor bendability, gas is generated over time, and powder is used. There were various problems such as inferior processability.
[0005]
As means for solving these problems, a fiber assembly is described in JP-B-5-63715. In this method, a lightweight and deformable vacuum heat insulating material is obtained by using a fiber aggregate such as glass fiber, ceramic fiber, or polymer synthetic chemical fiber as a core material of the vacuum heat insulating material.
[0006]
[Problems to be solved by the invention]
However, the prior art has a problem that the vacuum heat insulating material is not excellent in workability, or the product has not been developed yet and the advantages of the fiber assembly are not fully utilized.
[0007]
Moreover, using organic fibers for the core material may cause gas to be generated from the core material over time, resulting in deterioration of heat insulation performance.
[0008]
In addition, for the purpose of improving the heat insulation performance of the heat insulation box, heat insulation boxes using a vacuum heat insulation material using a resin foam or powder as a core material have been devised so far. Or there was a problem in workability.
[0009]
In view of the above problems, the present invention uses a vacuum heat insulating material using a core material in which an inorganic fiber aggregate is formed into a sheet shape as a core material that is highly reliable over time and excellent in workability. A heat insulating box having excellent productivity is obtained.
[0010]
In order to solve the above problems, the present invention provides a heat insulating box body in which a vacuum heat insulating material is disposed between an inner box and an outer box, and a hard urethane foam is foam-filled in a space other than the vacuum heat insulating material, and the heat insulating material. A refrigerator that uses a hydrocarbon-based combustible substance as a refrigerant for the rigid urethane foam of the heat insulation box and a refrigerant for the cooling device. The vacuum heat insulating material provided is composed of a core material and a gas barrier film covering the core material, and the core material is an aggregate of at least two layers of inorganic inorganic sheet to form an aggregate. In addition, as a vacuum heat insulating material formed as a multilayer by simply stacking without using an adhesive that fixes each layer , the refractory foaming agent and the refrigerant are used, and the refrigerator does not easily burn and generates no harmful gas.
[0011]
Therefore, the gas generated with the passage of time in the vacuum heat insulating material is very small, and the workability is excellent, so that it is possible to obtain a heat insulating box having excellent reliability over time and excellent productivity. Moreover, since the thin sheet-like substance is used for the core material, the thickness of the heat insulating box is reduced, and the space of the heat insulating box is reduced.
In addition, even when flammable substances such as hydrocarbons are used in refrigerators as foaming agents and refrigerants for rigid urethane foam, since the inorganic fibers are flame retardant and no adhesive is used between the layers, vacuum insulation The material is also difficult to burn and has a structure that does not generate harmful gases. Therefore, the refrigerator itself using this vacuum heat insulating material is also excellent in terms of safety, such as being difficult to burn.
[0012]
Moreover, the core material which can perform shape processing very easily is used, and it is possible to easily process multiple layers or cuts, bends, depressions, through holes, and the like.
[0013]
Therefore, it is possible to easily produce a vacuum heat insulating material suitable for the required heat insulating part and apply it to the heat insulating box, so that the coverage of the vacuum heat insulating material on the heat insulating box is improved and the heat insulating performance of the heat insulating box is also improved. is there.
[0014]
Furthermore, since a thin sheet-like core material is used, a thin partition plate can be obtained even when used as a partition plate in a heat insulation box, and the space in the box can be effectively used.
[0015]
The present invention provides a heat insulating box body in which a vacuum heat insulating material is disposed between an inner box and an outer box, and a hard urethane foam is foam-filled in a space other than the vacuum heat insulating material, and a cooling device for cooling the heat insulating box body. A refrigerator using a hydrocarbon-based combustible material as a foaming agent for the rigid urethane foam of the heat insulation box and a refrigerant of the cooling device, the vacuum heat insulation material disposed in the heat insulation box. The core material comprises a core material and a gas barrier film covering the core material, and the core material is an aggregate of at least two layers of sheet-like inorganic fibers, using an inorganic binder to form the aggregate, and bonding between the layers As a vacuum heat insulating material formed in multiple layers by simply stacking without using an agent, it is a refrigerator that does not easily burn and does not generate harmful gases while using the flammable foaming agent and the refrigerant .
[0016]
The constituent material of the sheet-like inorganic fiber aggregate is not particularly limited, and may be any inorganic fiber such as glass wool, ceramic fiber or rock wool. Moreover, it is not limited to a single material, and an organic or inorganic binder may be used to form an aggregate.
[0017]
Since inorganic fibers are used, gas generation with time in the vacuum heat insulating material is small, and therefore, the long-term reliability of the heat insulating box using the vacuum heat insulating material is improved.
In addition, even when flammable substances such as hydrocarbons are used in refrigerators as foaming agents and refrigerants for rigid urethane foam, since the inorganic fibers are flame retardant and no adhesive is used between the layers, vacuum insulation The material is also difficult to burn and has a structure that does not generate harmful gases. Therefore, the refrigerator itself using this vacuum heat insulating material is also excellent in terms of safety, such as being difficult to burn.
[0018]
In addition, since the assembly is formed, the process of encapsulating the powder in the inner bag is first omitted so that the powder is used as the core material when the vacuum heat insulating material is produced, which improves the production efficiency and the working environment. .
[0019]
In addition, since the core material does not scatter even when the vacuum heat insulating material is broken, the vacuum heat insulating material does not deteriorate when the heat insulating box is discarded. It is possible to discard the insulated box.
[0020]
Moreover, since it is sheet-like, it is thin and has good flatness, so that it is possible to reduce the thickness of the heat insulating box body wall and to obtain a heat insulating wall with excellent flatness.
[0021]
The gas barrier film covers the core material in order to provide an airtight portion therein, and the material structure is not particularly limited. For example, the outermost layer is polyethylene terephthalate resin, and the intermediate layer is aluminum foil. (Hereinafter referred to as “AL foil”), a plastic laminate film made of a high-density polyethylene resin in the innermost layer, and, for example, an ethylene-vinyl alcohol copolymer resin having a polyethylene terephthalate resin in the outermost layer and an AL deposited layer in the intermediate layer (trade name EVAL) , Manufactured by Kuraray Co., Ltd.), and a plastic laminate film made of high-density polyethylene resin in the innermost layer in a bag shape.
[0022]
The structural features of the jacket material are that the outermost layer responds to impacts and the like, the intermediate layer is for ensuring gas barrier properties, and the innermost layer is sealed by heat fusion. Therefore, all known materials can be used as long as they meet these purposes, and as a means for further improvement, puncture resistance is improved by applying a nylon resin or the like to the outermost layer, or an intermediate layer is provided. Two layers of an ethylene-vinyl alcohol copolymer resin having an AL vapor deposition layer may be provided.
[0023]
The innermost layer to be heat-sealed is preferably a high-density polyethylene resin from the viewpoint of sealing properties, chemical attack properties, etc. In addition to this, polypropylene resin, polyacrylonitrile resin, or the like may be used.
[0024]
In addition, for the purpose of dehydration and degassing of the core material, it is possible to perform a heat treatment before inserting the jacket material. The heating temperature at this time is preferably 100 ° C. or higher because dehydration is possible at a minimum.
[0025]
If further improving the reliability of the vacuum insulation, gas adsorbents such as dawsonite, hydrotalcite, metal hydroxide, or zeolite, calcium hydroxide, calcium chloride, lithium chloride, activated carbon, etc. It is also possible to use other moisture adsorbents.
[0026]
The resin foam may be, for example, rigid urethane foam, phenol foam, styrene foam, etc., but is not particularly specified.
[0027]
It is a heat insulation box having the vacuum heat insulating material and the resin foam as described above inside the box composed of the inner box and the outer box, but the vacuum heat insulating material and the resin foam are inserted inside the heat insulation box. As a method, a vacuum heat insulating material is disposed in a space formed in advance by the inner box and the outer box, and then the resin foam is injected and integrally molded, or the vacuum heat insulating material and the resin foam are integrated in advance. There are various methods such as preparing a molded heat insulation board and sticking the heat insulation board to the inner box or the outer box or sandwiching them between the two, but it is not particularly specified.
[0028]
In addition, the heat insulating box is a box for obtaining a heat insulating effect provided with a foam heat insulating material and a vacuum heat insulating material, such as a heat insulating box for refrigeration and freezing, a box for cold insulation and heat insulation, etc. Although not specified, for example, it can be used for a refrigerator box or door, a vending machine, a cooler box, a refrigerator car, and the like.
[0029]
Moreover, in the heat insulation box of this invention, the vacuum heat insulating material which has a core material which consists of a sheet-like inorganic fiber aggregate | assembly of at least 2 layers or more is used.
[0030]
Since a thin sheet-like core material is used, it can be used by adjusting it to a required thickness with two or more layers. Further, there are no problems even if the number of layers is different in one vacuum heat insulating material, such as three layers in some places and five layers in some places depending on the required shape.
[0031]
As described above, the core material having an infinite number of patterns can be easily manufactured by using one type of core material, thereby improving the productivity and reducing the material cost.
[0032]
In addition, an adhesive or the like may be used between the layers to fix each layer, but it is preferable to use only sheets in order to suppress gas generation as much as possible or reduce material costs and man-hours.
[0033]
Furthermore, since it has multiple layers, the exhaust efficiency at the time of vacuum exhaust is improved, and the production efficiency is also improved.
[0034]
Moreover, since it is a sheet-like inorganic fiber aggregate, the shape processing of the core material can be performed very easily.
[0035]
For example, it is easy to form a notch and shape the core material according to the required heat insulation location, and the insulation rate of the heat insulation box is improved by the vacuum heat insulation material. Will also improve.
[0036]
Moreover, a bending part can be formed and it can be set as the vacuum heat insulating material along the shape of the heat insulation box also three-dimensionally, and the heat insulation performance of a heat insulation box improves. Moreover, even if it does not have a bending part, it is also possible to use a cylindrical vacuum heat insulating material for the cylindrical heat insulating box.
[0037]
Moreover, since it has a hollow, for example, when there is a protrusion in the outer box or the inner box to which the vacuum heat insulating material is attached, by forming a hollow corresponding to the protrusion in the core material, Or it becomes possible to set it as the vacuum heat insulating material along the shape of an inner box, and becomes the thing excellent in the heat insulation performance and productivity of a heat insulation box.
[0038]
Further, when the adsorbent is used, it can be accommodated in this recess. At this time, there is no protrusion due to the adsorbent on the plane of the vacuum heat insulating material, and there is no bag breakage of the vacuum heat insulating material film caused by this protrusion, so the long-term reliability of the heat insulating box is also improved.
[0039]
A method for forming the depression can be produced by pressing according to the shape, but is not particularly specified.
[0040]
In addition, by forming a protrusion, for example, when there is a recess in the outer box or the inner box to which the vacuum heat insulating material is attached, by forming a protrusion corresponding to the recess in the core material, Or it becomes possible to set it as the vacuum heat insulating material along the shape of an inner box, and becomes the thing excellent in the heat insulation performance and productivity of a heat insulation box.
[0041]
As a method of forming the projection, there are methods such as laminating the sheet only on that portion, pressing a place other than the projection, and disposing on the sheet what can be a core material other than the sheet. It is not a thing.
[0042]
Moreover, since it has a through-hole, the film part which covers this through-hole is heat-welded, a screw etc. are penetrated to the heat-welded film part, and a vacuum heat insulating material is also fixed to a heat insulation box. Is possible.
[0043]
Further, the present invention provides a sheet-like inorganic fiber assembly on the same surface as the surface on which the thermoplastic resin is affixed by attaching a thermoplastic resin or a laminate film having a thermoplastic resin on the outermost surface to the inner surface of the outer box or the inner box. It is a heat insulation box which consists of a gas barrier film which arrange | positions a body and covers the sheet-like inorganic fiber aggregate | assembly, and the said thermoplastic resin and the said gas barrier film are heat-welded.
[0044]
Therefore, a vacuum heat insulating material is integrally molded on the inner surface of the outer box or the inner box, and then the space formed by the outer box and the inner box is filled with the resin foam, so that a heat insulating box body with excellent productivity can be obtained. Can be obtained.
[0045]
Moreover, since the sheet-like inorganic fiber aggregate is used, the core material has good flatness and good adhesion to the surface of the arranged outer box or inner box, so that the heat insulating performance of the heat insulating box is improved.
[0046]
Furthermore, by applying a vacuum heat insulating material using sheet-like inorganic fiber aggregates to the partition plate of the heat insulation box, it is possible to obtain a partition plate that is thin and lightweight and has excellent heat insulation performance. It can also be used.
[0047]
The partition of the heat insulation box can be used as a partition between rooms in the refrigerator, a hot and cold threshold part of a vending machine, etc., but is not particularly specified other than the above.
[0048]
In addition to arranging only the vacuum heat insulating material inside the partition plate, it may be a partition plate using a vacuum heat insulating material using at least a sheet-like inorganic fiber aggregate, such as a partition plate having a resin foam and a vacuum heat insulating material. That's fine.
[0049]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0050]
(Embodiment 1)
FIG. 1 is a cross-sectional view of a heat insulating box in one embodiment of the present invention. 1 is a heat insulation box which forms a refrigerator, and 2 is a vacuum heat insulating material. The heat insulating box 1 has a vacuum heat insulating material 2 disposed in advance inside a box formed by an inner box 3 formed by vacuum molding of ABS resin and an outer box 4 formed by press forming an iron plate via a flange 5. The space other than the material is foam-filled with hard urethane foam 6.
[0051]
FIG. 2 is a schematic view of the heat insulation box 1, in which one vacuum heat insulating material 2 is arranged on the top surface of the heat insulation box, one on the back, and two on the side. The vacuum heat insulating material 2 used for the side surface is cut in one side so as to match the shape of the side wall in accordance with the shape of the heat insulating box 1.
[0052]
FIG. 3 is a cross-sectional view of the vacuum heat insulating material 2 in the present embodiment, where 7 represents a sheet-like glass wool aggregate, and 8 represents a jacket material.
[0053]
The vacuum heat insulating material 2 is formed by drying a sheet-like glass wool aggregate 7 having a thickness of 5 mm for 1 hour at 130 ° C. and then inserting it into the outer cover material 8 to evacuate the inside to seal the opening. ing.
[0054]
The outer cover 8 has a laminated film made of polyethylene terephthalate (12 μm) as a surface protective layer on one side, aluminum foil (6 μm) in the middle, and high-density polyethylene (50 μm) on the other side. The surface protective layer is made of polyethylene terephthalate (12 μm), the middle part is an ethylene-vinyl alcohol copolymer resin composition (15 μm) on the inner side of a film layer with aluminum vapor deposition, and the heat seal layer is made of high-density polyethylene (50 μm) It is a laminate film.
[0055]
In addition, a nylon resin layer is formed on the surface protective layer of the jacket material 8 in order to improve the scratch resistance.
[0056]
The performance of the vacuum heat insulating material configured as described above was 0.0043 W / mK at 30 Pa.
[0057]
Accordingly, since the vacuum heat insulating material 2 is thin and has good heat insulating performance, the heat insulating box 1 to which the heat insulating box 1 is applied can be thinned, and the space of the refrigerator can be saved or the internal volume can be improved.
[0058]
Moreover, since it is a sheet form, it is easy to cut | disconnect a core material, The sheet | seat of the shape match | combined with the side wall is produced, Preferably it inserts in the jacket material suitable for the shape, and is set as a vacuum heat insulating material. By this, since the coverage of a heat insulation box improves and heat insulation performance improves, it becomes energy-saving and becomes an environmentally friendly refrigerator.
[0059]
In addition, since the inorganic fiber is flame retardant, the vacuum heat insulating material is also difficult to burn and has a structure that does not easily generate harmful gases. Therefore, the refrigerator itself using this vacuum heat insulating material is also excellent in terms of safety, such as being difficult to burn.
[0060]
Furthermore, even when a hydrocarbon-based flammable material is used in the refrigerator as a foaming agent or refrigerant for the resin foam, it has a structure in which the vacuum heat insulating material is difficult to burn because it uses inorganic fibers. Therefore, it is possible to provide a refrigerator that is extremely safe.
[0061]
(Embodiment 2)
FIG. 4 is a schematic diagram of a heat insulating box in one embodiment of the present embodiment.
[0062]
The heat insulating box 9 is used as a cooler box, and includes a box portion 10 and a lid portion 11.
[0063]
FIG. 5 is a schematic diagram of a box portion in one embodiment of the present embodiment.
[0064]
The box portion 10 is formed from the inner box 12 and the outer box 13 after the vacuum heat insulating material 2 is attached to the inner surface of the inner box with a double-sided tape inside the space formed by the inner box 12 and the outer box 13 made of polypropylene. The space inside the space where the vacuum heat insulating material 2 is not disposed is integrally molded by foam filling with the hard urethane foam 6.
[0065]
FIG. 6 is a schematic view of a lid portion in one embodiment of the present embodiment.
[0066]
After the vacuum heat insulating material 2 having the adsorbent 15 is disposed in the expanded polystyrene 14, the space formed by the inner frame 14 and the outer frame 15 is filled.
[0067]
In FIG. 5, the vacuum heat insulating material 2 uses two cores made of a sheet-like glass wool aggregate 7 having a thickness of 5 mm and is used as a single layer, in accordance with the shape of the heat insulating box 9. The material is folded into a U shape.
[0068]
Since the vacuum heat insulating material 2 is a sheet-like core material, it can be easily folded into a U-shape.
[0069]
Therefore, the coverage of the vacuum heat insulating material 2 with respect to the heat insulation box 9 improves, and the heat insulation performance of a heat insulation box improves.
[0070]
In FIG. 6, the lid portion 11 includes a foamed polystyrene 16 in which a recess is formed in advance according to the shape of the vacuum heat insulating material in a space formed by an inner frame 14 and an outer frame 15 made of polypropylene, and a vacuum embedded in the recess. The heat insulating material 2 is comprised.
[0071]
Since the vacuum heat insulating material 2 used for the lid part 11 is smaller than the vacuum heat insulating material used for the box part 10, the ratio of the seal part area of the jacket material is increased. Therefore, it is conceivable that the influence of gas entering from the sealing portion of the jacket material is great, the performance of the vacuum heat insulating material is deteriorated with time, and the heat insulating performance of the lid portion 11 is deteriorated.
[0072]
Therefore, the adsorbent 17 is used for the lid portion 11.
[0073]
For the production of the vacuum heat insulating material into which the adsorbent 17 was inserted, in order to maintain the flatness of the vacuum heat insulating material, a depression having a shape corresponding to the adsorbent 17 was formed in advance in the sheet-like glass wool aggregate 7 by a press machine. Thereafter, the adsorbent 17 was placed in the depression of the sheet-like glass wool aggregate 7, inserted into the jacket material, the inside was evacuated, and the opening was sealed to prepare a vacuum heat insulating material.
[0074]
Here, it is desirable that the adsorbent is composed of a normal-temperature-active getter material that adsorbs and removes at least nitrogen, oxygen, moisture, and carbon dioxide.
[0075]
(Embodiment 3)
FIG. 7 is a cross-sectional view of the heat insulation box in one embodiment.
[0076]
Reference numeral 18 denotes a heat insulating box forming a refrigerator. The heat insulating box 18 includes an inner box 3 formed by vacuum molding ABS resin and an outer box 4 formed by press forming an iron plate, and the vacuum heat insulating material 2 is disposed inside the box formed by the inner box 3 and the outer box 4. In addition, the space other than the vacuum heat insulating material is filled with hard urethane foam 6 by foaming.
[0077]
A thermoplastic resin 17 is applied to the inner surface of the outer box 4 in advance with a width of 10 mm along the outer periphery of the core material 2.
[0078]
At this time, the thermoplastic resin is heat-sealed with the heat seal layer of the jacket material 8, and high-density polyethylene, low-density polyethylene, polypropylene, or the like is desirable.
[0079]
After that, the rectangular sheet-like glass wool aggregate 7 is disposed on the inner surface of the outer box 4, and the three sides of the jacket material 8 are heat-sealed with the thermoplastic resin 17. The vacuum heat insulating material 2 can be obtained by evacuating and heat-sealing from the remaining one side.
[0080]
At this time, since the sheet-like glass wool aggregate 7 which is lightweight, excellent in flatness and thin is used as a core material, the heat insulation performance is improved because the adhesion with the inner surface of the outer box becomes good. Moreover, since it is lightweight and thin, it does not shift by its own weight when it is attached to the inner surface of the outer box.
[0081]
Furthermore, after forming the vacuum heat insulating material, when foaming and filling the hard urethane foam into the space formed by the inner box 3 and the outer box 4, the fluidity of the foam may be hindered because the core material is thin. Absent. Therefore, since the rigid urethane foam is uniformly filled without voids, the heat insulation performance of the heat insulation box is improved.
[0082]
As described above, the present invention provides a heat insulating box body in which a vacuum heat insulating material is disposed between an inner box and an outer box, and a rigid urethane foam is foam-filled in a space other than the vacuum heat insulating material, and the heat insulating box body. A refrigerator that uses a hydrocarbon-based combustible material as a foaming agent for the rigid urethane foam of the heat insulation box and a refrigerant for the cooling device, and the cooling device is disposed in the heat insulation box. The vacuum heat insulating material is composed of a core material and a gas barrier film covering the core material, and the core material is an aggregate of at least two layers of inorganic inorganic fibers to form an aggregate and each layer. As a vacuum heat insulating material formed as a multilayer by simply stacking without using an adhesive that fixes the refrigerator, it is a refrigerator that does not easily burn and generates no harmful gas while using the flammable foaming agent and the refrigerant .
[0083]
Therefore, the gas generated with the passage of time in the vacuum heat insulating material is very small, and the workability is excellent, so that it is possible to obtain a heat insulating box with excellent reliability over time and excellent productivity. Moreover, since the thin sheet-like substance is used for the core material, the thickness of the heat insulating box is reduced, and the space of the heat insulating box is reduced.
In addition, even when a flammable material such as a hydrocarbon is used in the refrigerator as a foaming agent or refrigerant for rigid urethane foam, since the inorganic fibers are flame retardant and no adhesive is used between the layers, vacuum insulation The material is also difficult to burn and has a structure that does not generate harmful gases. Therefore, the refrigerator itself using this vacuum heat insulating material is also excellent in terms of safety, such as being difficult to burn.

[0084]
Moreover, the core material which can perform shape processing very easily is used, and it is possible to easily process multiple layers or cuts, bends, depressions, through holes, and the like.
[0085]
Therefore, it is possible to easily produce a vacuum heat insulating material suitable for the required heat insulating part and apply it to the heat insulating box, so that the coverage of the vacuum heat insulating material on the heat insulating box is improved and the heat insulating performance of the heat insulating box is also improved. is there.
[0086]
Furthermore, since a thin sheet-like core material is used, a thin partition plate can be obtained even when used as a partition plate in a heat insulation box, and the space in the box can be effectively used.
[Brief description of the drawings]
1 is a cross-sectional view of a heat insulation box in one embodiment of the present invention. FIG. 2 is a schematic view of a heat insulation box in one embodiment of the present invention. FIG. 3 is a cross section of a vacuum heat insulating material in one embodiment of the present invention. FIG. 4 is a schematic diagram of a heat insulating box in an embodiment of the present invention. FIG. 5 is a schematic diagram of a box in an embodiment of the present invention. FIG. 6 is a schematic diagram of a lid in an embodiment of the present invention. FIG. 7 is a cross-sectional view of a heat insulating box in one embodiment of the present invention.
1, 9, 18 Heat insulating box 2 Vacuum heat insulating material 3, 12 Inner box 4, 13 Outer box 5 Flange 6 Hard urethane foam 7 Sheet-like glass wool aggregate 8 Outer cover 10 Box part 11 Lid part 14 Inner frame 15 Outer frame 16 Expanded polystyrene 17 Adsorbent 19 Thermoplastic resin

Claims (7)

A heat insulating box body in which a vacuum heat insulating material is disposed between an inner box and an outer box and a hard urethane foam is foam-filled in a space other than the vacuum heat insulating material, and a cooling device for cooling the heat insulating box body. A refrigerator using a hydrocarbon-based combustible substance as a foaming agent for the rigid urethane foam of the heat insulation box and a refrigerant of the cooling device, and the vacuum heat insulating material disposed in the heat insulation box as a core material. The core material is composed of a gas barrier film covering the core material, and the core material is an aggregate of at least two layers of inorganic inorganic fiber for forming the aggregate and without using an adhesive for fixing the layers. As a vacuum heat insulating material that is formed in multiple layers by simply stacking, a refrigerator that does not easily burn and does not generate harmful gases while using the flammable foaming agent and the refrigerant. The refrigerator according to claim 1 , wherein the vacuum heat insulating material is formed by forming a cutout portion on at least one side of the sheet-like inorganic fiber aggregate. The refrigerator according to claim 1 or 2 , wherein the vacuum heat insulating material is formed by bending at least one side of the sheet-like inorganic fiber aggregate. The refrigerator according to any one of claims 1 to 3, wherein the vacuum heat insulating material has a depression in at least one place of the sheet-like inorganic fiber aggregate. The refrigerator according to any one of claims 1 to 4, wherein the vacuum heat insulating material has a protrusion at at least one position of the sheet-like inorganic fiber aggregate. The refrigerator according to any one of claims 1 to 5, wherein the vacuum heat insulating material has a through hole in at least one place of the sheet-like inorganic fiber aggregate. The refrigerator according to any one of claims 1 to 6, wherein the heat insulating box has a partition plate, and the partition plate is provided with a vacuum heat insulating material .

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