JP2015001290A - Vacuum heat insulation material and refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core material, a vacuum heat insulation material and a refrigerator having high heat insulation performance.SOLUTION: A fiber assembly 51a is laminated. Two lines of slits 58a, 58b are provided which penetrate from a top layer fiber assembly 51a to an intermediate position of a lower layer fiber assembly 51c than the top layer fiber assembly 51a. After forming the slits 58a, 58b, pressure is applied between the two slits 58a, 58b, and a part of the top layer fiber assembly 51a is made to protrude in an intermediate layer fiber assembly 51b, and a part of the intermediate layer fiber assembly 51b is made to protrude in the bottom layer fiber assembly 51c. Thereby, the part of the top layer fiber assembly 51a is engaged with the intermediate layer fiber assembly 51b, and the part of the intermediate layer fiber assembly 51b is engaged with the bottom layer fiber assembly 51c, so that positional deviation of each fiber assembly can be prevented during transportation and when accommodating in an inner bag 52.

Description

  The present invention relates to a vacuum heat insulating material and a refrigerator.

  In recent years, home appliances and industrial equipment have been required to further improve heat insulation performance from the viewpoint of global environmental protection and energy saving. Conventionally, as a high-performance heat insulating material suitable for a refrigerator, a vacuum heat insulating material in which a core material made of a fiber assembly and an adsorbent for gas adsorption are put in a bag having a gas barrier property and the inside of the bag is sealed under reduced pressure is known. It has been. The core material of the vacuum heat insulating material is produced by laminating a predetermined number of sheet-like fiber assemblies. In Patent Document 1, several hundred or more sheet-like fiber assemblies drawn from a raw fabric roll are laminated to produce a fiber assembly laminate, and further, the fiber assembly laminate is folded. A method of manufacturing a core material having a required thickness is disclosed (see the abstract of Patent Document 1).

  However, according to this method, a large facility is required for the production of the core material, and it is difficult to increase the production efficiency of the core material. Moreover, according to the manufacturing method of the core material of patent document 1, since a sheet-like fiber assembly is bend | folded many times, a core material is easy to be cut | disconnected and there exists a possibility that heat insulation performance may deteriorate. Therefore, in order to make it possible to easily manufacture a core material having good heat insulation performance, for example, a thick fiber assembly having a thickness of about 100 mm is produced, and a plurality of fiber assemblies (for example, a plurality of fiber assemblies (for example, It has been studied to manufacture a core material having a required thickness by stacking (about 2 to 5 sheets).

JP 2012-163138 A

  As described above, the vacuum heat insulating material is manufactured by sealing the inside of the bag under reduced pressure after putting the core material and the adsorbent in the bag having gas barrier properties. However, since the core material formed by laminating a plurality of thick fiber assemblies is likely to slip on the lamination surface of each fiber assembly, it has been transferred when the manufactured core material is transferred by a conveyor. When the core material is stored in the bag, as shown in FIG. 7A, a problem that the fiber assemblies A, B, and C are displaced in the surface direction is likely to occur. Thus, when the core material D in which the fiber assemblies A, B, and C are displaced in the surface direction is stored in the bag body E, as shown in FIG. The vacuum heat insulating material whose thickness becomes small and the heat insulating performance is lowered due to the decrease of the heat insulating volume is manufactured. Needless to say, when such an illegal vacuum heat insulating material is applied to a refrigerator, the heat insulating performance of the refrigerator deteriorates.

  In addition, the core material is not directly stored in the bag having gas barrier properties, but the core material is stored in a synthetic resin bag called an inner bag, and the inner bag compressed to a predetermined thickness has gas barrier properties. A vacuum heat insulating material of a type stored in a bag is also known in the past. In this type of vacuum heat insulating material, the fiber assemblies A, B, and C are displaced in the surface direction in the step of putting the core material in the inner bag.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vacuum heat insulating material and a refrigerator having high heat insulating performance, and to provide a vacuum heat insulating material that can be easily manufactured.

  In order to solve the above-mentioned problem, the present invention is a core material formed by laminating a plurality of fiber assemblies, and is characterized in that a plurality of slits straddling at least two fiber assemblies are formed.

  ADVANTAGE OF THE INVENTION According to this invention, it can provide with a vacuum heat insulating material and a refrigerator with high heat insulation performance, and can provide the vacuum heat insulating material which manufacture is easy. The subject of this invention other than the above, a structure, and an effect are clarified by description of the following embodiment.

It is a front view of the refrigerator which concerns on embodiment. It is AA sectional drawing of FIG. It is sectional drawing of the vacuum heat insulating material which concerns on embodiment. 1 is a cross-sectional view of a laminated body of fiber assemblies that constitute a vacuum heat insulating material according to Example 1. FIG. 6 is a plan view of a laminated body of fiber assemblies that constitute a vacuum heat insulating material according to Example 2. FIG. It is sectional drawing of the laminated body of the fiber assembly which comprises the vacuum heat insulating material which concerns on Example 3. FIG. It is explanatory drawing of the vacuum heat insulating material which concerns on a prior art example.

  First, the overall configuration of the refrigerator according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a front view of a refrigerator according to the embodiment, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

  As shown in FIG. 2, the refrigerator 1 according to the embodiment includes a refrigerator room 2, an ice making room 3 a, an upper freezer room 3 b, a lower freezer room 4, and a vegetable room 5 from the top. Moreover, as shown in FIG. 1, the front of each of these chambers has a refrigerator compartment door 6a, 6b, an ice storage door 7a, an upper freezer compartment door 7b, a lower freezer compartment door 8, a vegetable compartment which closes the front opening. A door 9 is provided. The refrigerator compartment doors 6a and 6b are pivotable doors that pivot about the hinge 10, and the other doors 7a, 7b, 8, and 9 are all drawer-type doors. When these pull-out doors 7a, 7b, 8, 9 are pulled out, the containers constituting each chamber are pulled out together with the doors. Each door 6 a, 6 b, 7 a, 7 b, 8, 9 has a packing 11 for sealing the refrigerator main body 1, and each of these packings 11 includes a door 6 a, 6 b, 7 a, 7 b, 8, 9. Attach to the outer periphery of the room. Further, a partition heat insulation wall 12 for partition heat insulation is disposed between the refrigerator compartment 2, the ice making chamber 3a, and the upper freezer compartment 3b. On the other hand, since the temperature zones are the same between the ice making chamber 3a and the upper freezing chamber 3b and the lower freezing chamber 4, the partition member 13 that forms the receiving surface of the packing 11 instead of the partition heat insulating wall that insulates the partition. Is provided. Furthermore, a partition heat insulation wall 14 is provided between the lower freezer compartment 4 and the vegetable compartment 5 to insulate the compartment. Thus, partition heat insulation walls are basically installed in the partitions of rooms with different storage temperature zones such as refrigeration and freezing.

  In the example of FIGS. 1 and 2, storage compartments for the refrigerator compartment 2, the ice making compartment 3 a and the upper freezer compartment 3 b, the lower freezer compartment 4, and the vegetable compartment 5 are formed in the box 20 from the top. However, the arrangement of each storage room is not particularly limited to this. Further, the refrigerator doors 6a and 6b, the ice making door 7a, the upper freezer compartment door 7b, the lower freezer compartment door 8 and the vegetable compartment door 9 are also particularly limited in terms of opening and closing by rotation, opening and closing by drawer, and the number of divided doors. Not what you want.

  The box 20 includes an outer box 21 and an inner box 22, and a heat insulating portion is provided in a space formed by the outer box 21 and the inner box 22 to insulate each storage chamber in the box 20 from the outside. doing. A vacuum heat insulating material 50 is disposed in the space between the outer box 21 and the inner box 22, and the space around the vacuum heat insulating material 50 is filled with a foam heat insulating material 23 such as hard urethane foam.

  On the back side of the freezer compartment 4, a refrigeration cycle machine for cooling each room such as the refrigerator compartment 2, the freezer compartments 3 a and 4, the vegetable compartment 5 to a predetermined temperature is provided. The refrigeration cycle machine includes a cooler 28, a compressor 30, a condenser 31, and a capillary tube that connects them. Above the cooler 28, a blower 27 that circulates the cool air cooled by the cooler 28 in the refrigerator and maintains a predetermined low temperature is disposed.

  Although the partition heat insulation walls 12 and 14 can be comprised with the foamed polystyrene 33 which embedded the vacuum heat insulating material 50c, it is not limited to this, It can also form using foam heat insulating materials, such as a rigid urethane foam.

  For example, a recessed portion 40 for accommodating an electrical component 41 such as a substrate for controlling the operation of the refrigerator 1 or a power supply substrate is formed in the rear portion of the top surface of the box 20. A cover 42 that covers the electrical component 41 is provided in the opening of the recess 40. The height of the cover 42 is set to be substantially the same as the top surface of the outer box 21 in consideration of the appearance design of the refrigerator and securing the internal volume. In addition, although it does not specifically limit, when the height of the cover 42 protrudes from the top | upper surface of an outer box, it is desirable to set it in the range within 10 mm. As described above, since the rear portion of the top surface of the box 20 has the concave portion 40 for housing the electrical component 41, the internal volume is inevitably sacrificed when the heat insulation thickness is to be secured. If the thickness is made larger, the thickness of the heat insulating material 23 between the recess 40 and the inner box 22 will be reduced. For this reason, in the refrigerator of this example, in the heat insulating material 23 of the recessed part 40, the one vacuum heat insulating material 50a shape | molded by the substantially Z shape is arrange | positioned, and the heat insulation performance is ensured and strengthened. The cover 42 can be made of, for example, a steel plate in consideration of heat resistance.

  Moreover, since the compressor 30 and the condenser 31 which are arrange | positioned at the back lower part of the box 20 are components with big heat_generation | fever, in order to prevent the heat | fever penetration | invasion into a store | warehouse | chamber, it is preferable to arrange | position the vacuum heat insulating material 50d to the baseplate 21d side. .

  Next, the structure of the vacuum heat insulating materials 50a-50d is demonstrated using FIG. The vacuum heat insulating materials 50a to 50d include a core material 51, an inner bag 52 for holding the core material 51 in a compressed state, and an outer bag 53 covering the core material 51 held in a compressed state by the inner bag 52. Preferably, an adsorbent 54 embedded in the core material 51 is included.

  The vacuum heat insulating materials 50a to 50d are produced, for example, by the following procedure. First, a predetermined number of rolls of fiber aggregate original fabric sheets are laminated and cut into a predetermined size to produce a fiber aggregate laminate from which the core material 51 is based. After the laminated body of fiber assemblies is stored in the inner bag 52, the inner bag 52 in which the stacked body of fiber assemblies is stored is compressed by a press. Next, after the inner bag 52 is depressurized, the entire opening of the inner bag 52 is heat-sealed and sealed using a heat welding machine to obtain a core material temporary compression assembly. After that, the core material temporary compression assembly is stored in the outer bag 53 and the inner bag 52 is broken. Finally, the inside of the outer bag 53 is decompressed, and the opening is welded and sealed to obtain a desired vacuum heat insulating material. For example, the core material is not limited to the above, and the core material is a fiber. An aggregate or the like may be used.

  In addition, as shown in FIG. 3, the fiber aggregates 51a, 51b, and 51c can be laminated in three layers having a thickness of 100 mm, for example. Moreover, in this embodiment, when storing the laminated body of the fiber assemblies 51a, 51b, and 51c in the inner bag 52, each fiber assembly 51a, 51b, 51c which comprises a laminated body shifts | deviates to a surface direction. In order to prevent this, a plurality of slits that vertically cut at least one of the two adjacent fiber assemblies 51a and 51b and the fiber assemblies 51b and 51c were inserted. When the plurality of slits are pressed to locally deform the fiber assemblies 51a, 51b, 51c of each layer, one of the adjacent fiber assemblies is pushed into the other fiber assembly, so that the layers are laminated. Moreover, the shift | offset | difference to the surface direction of each fiber assembly 51a can be prevented. This will be described later with a specific example.

  As the core material 51, an inorganic fiber material can be used, and an organic resin fiber material can also be used. The laminated body of inorganic fiber materials is advantageous in terms of heat insulation performance because it has less outgas compared to organic resin fiber materials. Examples of the inorganic fiber material include glass wool, ceramic fiber, rock wool, glass fiber other than glass wool, and the like. For example, as the core material 51, a glass wool having an average fiber diameter of 4 μm which is not bonded or bound with a binder or the like and whose thickness is adjusted to 100 mm can be laminated in three layers. Depending on the type of the core material 51, the inner bag 52 may be omitted.

  Use of the organic resin fiber is not particularly limited as long as the heat-resistant temperature is cleared. Specifically, it is common to use polystyrene, polyethylene terephthalate, polypropylene, etc., which are fiberized so as to have a fiber diameter of about 1 to 30 μm by a melt blown method or a spunbond method, but are not limited thereto. It is not something.

  The inner bag 52 is formed using a resin film such as a polyethylene film, a polypropylene film, a polyethylene terephthalate film, or a polybutylene terephthalate film that has low hygroscopicity, can be thermally welded, and has little outgas.

  The outer bag 53 is formed into a bag shape by laminating laminate films of the same size arranged on both surfaces of the inner bag 52. The lamination film is bonded by thermally welding a portion outside the housing portion of the core material 51 and inside the outer edge portion of the laminate film with a constant width.

  The laminated structure of the outer bag 53 is configured to have gas barrier properties and to be heat weldable. In the present embodiment, a laminated film having a four-layer structure of a surface protective layer, a first gas barrier layer, a second gas barrier layer 2 and a heat welding layer is formed. As the surface protective layer, for example, a resin film having a role of a protective material is used. As the first gas barrier layer, for example, a resin film provided with a metal vapor deposition layer is used. As the second gas barrier layer 2, for example, a resin film having a high oxygen barrier property provided with a metal vapor deposition layer is used. The first gas barrier layer and the second gas barrier layer are bonded together so that, for example, the metal vapor deposition layers face each other. As the heat-welding layer, for example, a film having a low hygroscopic property is used in the same manner as the surface protective layer.

  As a specific example, for the surface protective layer, a biaxially stretched film of polypropylene, polyamide, polyethylene terephthalate, or the like is suitable. As the first gas barrier layer, a biaxially stretched polyethylene terephthalate film with an aluminum vapor deposition film is suitable. As the second gas barrier layer, a biaxially stretched ethylene vinyl alcohol copolymer resin film with an aluminum deposited film, a biaxially stretched polyvinyl alcohol resin film with an aluminum deposited film, or an aluminum foil is suitable. As the heat welding layer, an unstretched type polyethylene or polypropylene film is suitable.

  However, the layer configuration and material of the laminate film are not limited to the above-described embodiment, and can be appropriately changed to other layer structures and materials. For example, as the first and second gas barrier layers, a metal foil or a resin-based film is provided with an inorganic layered compound, a resin-based gas barrier coating material such as polyacrylic acid, or a gas barrier film made of DLC (diamond-like carbon) or the like. Things can be used. Moreover, as a heat welding layer, you may use the polybutylene terephthalate film etc. with a high oxygen barrier property, for example. The surface protective layer functions as a protective material for the first gas barrier layer 1, but it is desirable to dispose a resin with low hygroscopicity in order to improve the vacuum exhaust efficiency in the manufacturing process of the vacuum heat insulating material. In addition, since the gas barrier property of the second gas barrier layer 2 is significantly deteriorated when the resin film in contact with the aluminum vapor deposition film or the like absorbs moisture, a resin having low hygroscopic property is also provided for the heat welding layer. It is desirable to suppress the deterioration of property and to suppress the moisture absorption amount of the entire laminate film. As a result, in the vacuum evacuation process of the vacuum heat insulating material 50 described above, the amount of moisture brought into the outer bag 53 can be reduced, so that the vacuum evacuation efficiency is greatly improved and the heat insulation performance is improved.

  In addition, the lamination (bonding) of each film is generally performed by a dry lamination method via a two-component curable urethane adhesive, but the type of adhesive and the bonding method are particularly limited to this. However, other methods such as a wet laminating method and a thermal laminating method may be used.

  Further, in order to improve the removal of the core material 51 from the inner bag 52 and the removal of the inner bag 52 from the outer bag 53, the inner bag 52 and the outer bag 53 are formed of a material having high lubricity. It is desirable.

  As the adsorbent 54, a physical adsorption type synthetic zeolite is preferably used, but the gist of the present invention is not limited to this, and the residual gas and moisture after sealing the outer packaging material of the vacuum heat insulating material are used. Any adsorbent may be used, for example, a physical adsorbent other than synthetic zeolite or a chemical reaction type adsorbent can be used. Molecular sieves, silica gel, calcium oxide, synthetic zeolite, activated carbon, potassium hydroxide, sodium hydroxide, Or lithium hydroxide etc. can be used individually or in combination. Preferably, the adsorbent 54 is embedded in one of the slits formed in the fiber aggregates 51a, 51b, 51c. As described above, when the adsorbent 54 is embedded using the slits formed in the fiber assemblies 51a, 51b, 51c, it is not necessary to separately form a slit for embedding the adsorbent 54, and thus the vacuum heat insulating material 50a. Production of ˜50d can be made easier.

  Hereinafter, more specific examples of the vacuum heat insulating materials 50a to 50d configured as described above will be described. In each of the following examples, the core material 51 will be described by taking an example in which a fiber assembly having a thickness of 100 mm is laminated in three layers. However, the thickness and the number of laminations of the fiber assembly are not limited thereto. It is not something. About these, it can select suitably as needed.

<Example 1>
The structure of the vacuum heat insulating materials 50a-50d which concern on Example 1 is demonstrated using Fig.4 (a)-(c). 4A is a plan view of the laminated body of the fiber assembly, FIG. 4B is a cross-sectional view of the laminated body of the fiber assembly before pressing (cross-sectional view taken along line BB in FIG. 4A), FIG. (C) is sectional drawing (BB sectional drawing of Fig.4 (a)) of the laminated body of the fiber assembly after a press.

  As shown in FIGS. 4A and 4B, in Example 1, the fiber assembly is laminated in three layers, and the surface of the uppermost fiber assembly 51a is below the uppermost fiber assembly 51a. Two slits 58a and 58b are provided which reach the middle position of the fiber assembly located at the center, preferably the middle position of the lowermost fiber assembly 51c. These two slits 58a, 58b are preferably the same length as shown in FIG. 4B, and preferably 2 from the uppermost fiber assembly 51a to the lowermost fiber assembly 51c. The slits 58a and 58b are formed in a reverse tapered shape in which the interval between the slits 58a and 58b is narrowed. By forming an inversely tapered shape, a pressurizing force is applied to the entire region between the slits 58a and 58b in each fiber assembly during pressurization described later, and the region between the slits 58a and 58b. It is preferable in that the pressing force is transmitted to the lowermost part of the fiber and the fiber assembly is sufficiently pushed. After forming the slits 58a and 58b, as shown in FIG. 4 (c), the space between these two slits 58a and 58b is pressurized, and a part of the uppermost fiber assembly 51a is partially attached to the intermediate fiber assembly. It protrudes in 51b, A part of the fiber assembly 51b of an intermediate | middle layer is protruded in the fiber assembly 51c of the lowest layer. Thereby, a part of the uppermost fiber assembly 51a is engaged with the intermediate fiber assembly 51b, and a part of the intermediate fiber assembly 51b is engaged with the lowermost fiber assembly 51c. Even if a force is applied in the surface direction of each fiber assembly 51a, 51b, 51c at the time of conveyance or storage in the inner bag 52, the positional deviation thereof can be prevented.

  Therefore, when a vacuum heat insulating material is produced using the laminated body of the fiber assemblies 51a, 51b, 51c produced in this way, a core material 51 having a constant thickness is accommodated to the end as shown in FIG. And the vacuum heat insulating materials 50a-50d by which the fall of the heat insulation performance by the reduction | decrease of heat insulation volume was suppressed can be produced. And the refrigerator with favorable heat insulation performance can be manufactured by using the vacuum heat insulating materials 50a-50d produced in this way.

<Example 2>
The structure of the vacuum heat insulating materials 50a-50d which concern on Example 2 is demonstrated using Fig.5 (a)-(c). Each of these figures is a plan view of a laminate of fiber assemblies 51a. FIG. 5A is characterized in that the slits 58a to 58h are arranged in a ring shape. About others, it is comprised similarly to the vacuum heat insulating materials 50a-50d which concern on Example 1. FIG. Even with the vacuum heat insulating materials 50a to 50d according to the present embodiment, the same effects as the vacuum heat insulating materials 50a to 50d according to the first embodiment are obtained, and the slits 58a to 58h are arranged in a ring shape, and thus act on the fiber assembly 51a. Regardless of the direction of the external force to be applied, it is possible to exhibit a uniform shift prevention effect. Note that the number of slits 58a to 58h is not limited to this, and the slits 58a to 58d may be formed in a rectangular frame shape as shown in FIG. The effect is obtained. In addition, as shown in FIG.5 (c), the slits 58a and 58b can also be formed in a waveform.

<Example 3>
The structure of the vacuum heat insulating materials 50a-50d which concern on Example 2 is demonstrated using Fig.6 (a)-(e). These drawings are all side views of a laminated body of fiber assemblies 51a, 51b, and 51c. FIG. 6A shows an embodiment in which two slits 58a and 58b are formed in a tapered shape. FIG. 6B shows an embodiment in which two slits 58a and 58b are formed in parallel. FIG. 6C shows an embodiment in which the inclination angles of the two slits 58a and 58b are different from each other. FIG. 6D shows an embodiment in which the slit depths of the two slits 58a and 58b are made different from each other. FIG. 6E shows an embodiment in which two slits 58a and 58b are formed from the surface of the uppermost fiber assembly 51a to the intermediate position of the intermediate fiber assembly 51b. In addition, the number of slits can be two or more. Also with the vacuum heat insulating materials 50a to 50d according to the present embodiment, the same effects as the vacuum heat insulating materials 50a to 50d according to the first embodiment are obtained.

  As described above, the present invention forms a plurality of slits 58a, 58b ... in the laminated fiber assemblies 51a, 51b, 51c, and pressurizes intermediate portions of the slits 58a, 58b ... Since the fiber assemblies 51a, 51b, 51c of each layer are engaged with each other, the position of the fiber assemblies 51a, 51b, 51c of each layer can be shifted without bonding or welding the fiber assemblies 51a, 51b, 51c of each layer. Can be prevented. Therefore, it is possible to obtain a vacuum heat insulating material having higher heat insulating performance than the case of bonding or welding.

  The present invention includes the following aspects.

  A core material obtained by laminating a plurality of layers of fiber aggregates in the thickness direction; an adsorbent disposed in the core material; and a bag body that stores the core material and the adsorbent. The fiber assembly has a plurality of slits extending over at least two adjacent layers, and the adsorbent is disposed in a part of the slits.

  That is, since a plurality of slits straddling them are formed in a plurality of fiber assemblies constituting the core material of the vacuum heat insulating material, when the space between the slits is pressed, the pressed portion of one fiber assembly is changed to the other one. It enters the inside of the fiber assembly and functions as a stopper against the force acting in the surface direction. For this reason, without adhering or welding the fiber assemblies to be laminated, it is possible to prevent displacement of the fiber assemblies and collapse of the laminate during transfer or storage in the bag body, and a vacuum heat insulating material having a high heat insulation effect. Can be manufactured with high efficiency. Moreover, the heat insulation performance of a refrigerator can be improved by using the vacuum heat insulating material manufactured in this way.

  Further, at least a part of the slit is formed in a ring shape. Thereby, regardless of the direction of the external force acting on the fiber assembly 51a, it is possible to exhibit a uniform displacement prevention effect.

  The slit is formed so that both ends of each slit are not connected to each other. Accordingly, when the fiber aggregates of each layer are locally deformed by pressing between a plurality of slits, one of the adjacent fiber aggregates is pushed into the other fiber aggregate. Deviation in the body surface direction can be prevented.

  In addition, an outer box, an inner box, and a vacuum heat insulating material housed in a space formed between the outer box and the inner box, the vacuum heat insulating material has a thickness of a plurality of fiber assemblies. A core material laminated in a direction, an adsorbent disposed in the core material, and a bag body that houses the core material and the adsorbent, and at least adjacent one of the plurality of fiber assemblies. A slit extending over two layers is provided, and the adsorbent is disposed in a part of the slit.

  Thereby, it can utilize for the improvement of the heat insulation performance of refrigeration equipment, such as a refrigerator and a refrigerator-freezer.

  DESCRIPTION OF SYMBOLS 1 ... Refrigerator, 2 ... Refrigeration room, 3a ... Ice making room, 3b ... Upper stage freezing room, 4 ... Lower stage freezing room, 5 ... Vegetable room, 6a ... Refrigeration room door, 6b ... Refrigeration room door, 7a ... Ice making room door, 7b ... upper freezer compartment door, 8 ... lower freezer compartment door, 9 ... vegetable compartment door, 10 ... door hinge, 11 ... packing, 12, 14 ... heat insulating partition, 13 ... partition member, 20 ... box, 21 ... outer box 21a ... top plate, 21b ... back plate, 21d ... bottom plate, 21e ... side plate, 21f ... front surface, 22 ... inner box, 23 ... heat insulating material, 27 ... blower, 28 ... cooler, 30 ... compressor, 31 ... Condenser, 33 ... Expanded polystyrene, 40 ... Recess, 41 ... Electrical component, 42 ... Cover, 50a-50d ... Vacuum insulation, 51 ... Core material, 51a, 51b, 51c ... Fiber assembly, 52 ... Inner bag, 53 ... Outer bag, 54 ... Adsorbent, 58a-51f ... Cut

Claims (4)

A core material obtained by laminating a plurality of layers of fiber assemblies in the thickness direction, an adsorbent disposed in the core material, and a bag body that stores the core material and the adsorbent,
A vacuum heat insulating material having a plurality of slits extending over at least two adjacent layers of the multi-layer fiber assembly, wherein the adsorbent is disposed in a part of the slits. The vacuum heat insulating material according to claim 1,
A vacuum heat insulating material characterized in that at least a part of the slit is formed in a ring shape. In the vacuum heat insulating material of any one of Claim 1 and Claim 2,
The slit is formed so that both ends of each slit are not connected to each other. An outer box, an inner box, and a vacuum heat insulating material housed in a space formed between the outer box and the inner box,
The vacuum heat insulating material includes a core material in which a plurality of fiber assemblies are laminated in a thickness direction, an adsorbent disposed in the core material, and a bag body that stores the core material and the adsorbent. And
A refrigerator having a slit extending over at least two adjacent layers among the plurality of fiber assemblies, wherein the adsorbent is disposed in a part of the slit.