JP6909841B2 - Vacuum insulation panel and refrigerator - Google Patents

Description

Embodiments of the present invention relate to vacuum insulation panels and refrigerators.

Conventionally, a refrigerator is composed of a cabinet filled with a foam heat insulating material between an outer box and an inner box, and forms a storage chamber inside the cabinet. However, the heat insulating performance is further improved and power consumption is increased. In order to reduce the amount or reduce the wall thickness of the cabinet to improve the volume efficiency inside the refrigerator, a vacuum insulation panel is provided instead of a part of the foam insulation material filled between the outer box and the inner box. Has been done.

This type of vacuum insulation panel includes, for example, a core material and a bag body, as shown in Patent Document 1. The core material is formed of glass wool or the like, which is a cotton-like material of fine glass fibers, and the bag body is formed of a laminated film bag or the like having aluminum foil or the like. This vacuum heat insulating panel is configured by accommodating a core material in a bag body, decompressing the inside of the bag, closing an opening, and holding the inside of the bag in a decompressed state.

However, if the bag body of the vacuum heat insulating panel is damaged during panel manufacturing or when it is incorporated into a cabinet, external air enters the inside of the bag body, and the heat insulating performance is significantly deteriorated. In particular, when a hole is created due to damage to the bag body, even if the hole is as fine as a few μm or less, the amount of external air entering the inside of the bag body is small, and the hole formed in the bag body Although it depends on the size, a slow leak occurs in which the heat insulating performance of the vacuum heat insulating panel gradually deteriorates over a long period of several tens of days to several months, and finally the inside of the bag becomes atmospheric pressure. Insulation performance deteriorates significantly. Therefore, even if sufficient heat insulating performance is confirmed at the time of manufacturing the vacuum heat insulating panel, the heat insulating performance gradually deteriorates thereafter, so that it is difficult to secure the reliability of the heat insulating performance for a long period of time.

Japanese Unexamined Patent Publication No. 2005-106094

Therefore, it is an object of the present invention to provide a refrigerator using a vacuum heat insulating panel capable of maintaining heat insulating performance for a long period of time.

The vacuum heat insulating panel of the present embodiment has a core material, a first bag body whose inside is vacuum-sealed with the core material housed, and a first bag body whose inside is vacuum-sealed. In a vacuum heat insulating panel in which the first bag body and the second bag body are bonded to each other in a flat portion, the first bag body and the second bag body are provided with a second bag body sealed under reduced pressure. , The surface of the first bag body bonded to the second bag body is made of the same material as the surface of the second bag body bonded to the first bag body. It is configured.

Further, the refrigerator of the present embodiment is a refrigerator provided with a heat insulating box body in which a vacuum heat insulating panel is provided between an outer box and an inner box, and the vacuum heat insulating panel accommodates a core material and the core material. A first bag body whose inside is vacuum-sealed in a state and a second bag body whose inside is pressure-reduced sealed while accommodating the first bag body whose inside is pressure-reduced are provided with the first bag body. The second bag body is adhered to the flat portion, and the first bag body and the second bag body are made of a laminated film in which a plurality of films are laminated, and are adhered to the second bag body in the first bag body. The surface is made of the same material as the surface adhered to the first bag in the second bag.

It is sectional drawing of the refrigerator which concerns on 1st Embodiment. It is an enlarged sectional view of the main part of the vacuum insulation panel used for the refrigerator shown in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the refrigerator 10 of the present embodiment is a refrigerator 10 provided with a heat insulating space between an outer box 12 made of a steel plate and an inner box 14 housed inside the outer box 12 to form a storage space. A cabinet 18 forming the outer shell of the above is provided, and the cabinet 18 is configured by incorporating a refrigerating cycle (not shown) or the like.

On the heat insulating space side of the outer box 12 and the inner box 14 forming the heat insulating space, the vacuum heat insulating panel 50 is not bent and is made of a thermoplastic adhesive so as to be substantially flat along the outer box 12 and the inner box 14. It is attached by an adhesive such as (hot melt). Further, the cabinet 18 may have a gap in the heat insulating space other than the vacuum heat insulating panel 50. If necessary, a foam insulating material 20 made of urethane foam or the like and a refrigerant pipe such as a heat radiating pipe forming a part of the refrigeration cycle are arranged in this gap, and the outer box 12 and the inner box 14 are integrated. Will be done. In particular, a part of the refrigerant pipe such as the heat radiating pipe is arranged by forming a concave groove on the outer box 12 side of the vacuum heat insulating panel 50 and storing the refrigerant pipe in the concave groove. Therefore, in the vacuum heat insulating panel 50 arranged on the back surface or the side surface of the refrigerator 10, the refrigerant pipe and the vacuum heat insulating panel 50 are in contact with each other.

The storage space provided inside the cabinet 11 is divided into an upper refrigerating space and a lower freezing space by a heat insulating partition wall 22. The refrigerating space is further divided into upper and lower parts by a partition wall 24, a refrigerating room 26 having a plurality of stages of storage shelves is provided in the upper space, and a vegetable room 28 in which a drawer-type storage container is arranged is provided in the lower space. ing. In the freezing space, an ice making chamber 30 equipped with an automatic ice maker having a relatively small volume and a small freezing chamber 32 are provided on the left and right sides, and a freezing chamber 34 is provided below the ice making chamber 30.

FIG. 2 shows a cross section of the end portion of the vacuum heat insulating panel 50. The vacuum heat insulating panel 50 contains a rectangular plate-shaped core material 52 formed according to the shape of the wall portion to be attached, and a core material 52. It includes one bag body 54 and a bag-shaped second bag body 56 that houses the first bag body 54 that houses the core material 52.

The core material 52 is a laminated material 52a made of a material having high heat insulating properties, for example, an inorganic fiber such as glass wool or silica alumina, or an inorganic powder such as silica powder, in an inner bag 52b made of a synthetic resin film such as polyethylene. After being stored, it is compression-cured into a rectangular plate and molded.

The first bag body 54 includes a laminated film having a three-layer structure in which a surface protective layer 54a, a gas barrier layer 54b, and a heat welding layer 54c are laminated in this order from the outside to the inside. The surface protective layer 54a is made of a relatively heat-resistant synthetic resin such as polyethylene terephthalate. The gas barrier layer 54b is formed of a metal vapor deposition (for example, an aluminum vapor deposition in which aluminum is vapor-deposited on a resin film) or a metal foil (for example, an aluminum foil). The heat-welding layer 54c is made of a synthetic resin having heat-welding properties such as high-density polyethylene.

The first bag body 54 has an opening due to heat welding and sealing of the two laminated films by superimposing the heat welding layers 54c of the two laminated films facing each other and pressurizing and heating the peripheral portion. It is formed in the shape of a bag. In the first bag body 54, after the core material 52 is housed inside through the opening, the opening of the first bag body 54 is sealed by heat welding in a state where the inside is evacuated and decompressed.

The peripheral edge of the first bag body 54 protrudes from the core material 52 to the periphery in order to heat-weld the two laminated films, and this protruding portion is bent at the edge of the core material 52, and one laminated film is formed. The folded-back portion 62 is formed so as to be overlapped with the above.

The second bag 56 includes a laminated film having the same configuration as the laminated film constituting the first bag 54 in which the surface protective layer 56a, the gas barrier layer 56b, and the heat welding layer 56c are laminated in this order from the outside to the inside. The heat-welded layers 56c of the two laminated films are laminated so as to face each other, and the peripheral portion is pressurized and heated to heat-weld the two laminated films and seal them to form a bag shape having an opening. Has been done.

In the second bag body 56, after the first bag body 54 whose inside is vacuum-sealed with the core material 52 housed is housed, the opening of the second bag body 56 is opened in a state where the inside is evacuated and decompressed. It is sealed by heat welding.

The peripheral edge of the second bag 56 protrudes from the first bag 54 containing the core material 52 for heat welding the two laminated films, and the protruding portion of the first bag 54 It is bent at the edge portion to form a folded portion 64 overlaid on one laminated film. In the present embodiment, the folded-back portion 64 provided on the second bag body 56 is overlapped with the folded-back portion 62 so as to cover the folded-back portion 62 provided on the first bag body 54 from the outside.

In the second bag body 56, the heat welding layer 56c located on the inner surface thereof is adhered and fixed by the surface protective layer 54a located on the outer surface of the first bag body 54 housed inside the second bag body 56 and the adhesive layer 58. Has been done. At this time, the adhesive layer 58 is provided in a region that does not overlap with the folded-back portions 62 and 64.

Specifically, when the first bag body 54 is housed inside the second bag body 56, olefin-based, polyester-based, or urethane-based heat is generated between the first bag body 54 and the second bag body 56. Two heat-adhesive sheets containing a plastic adhesive (hot melt) are inserted so as to sandwich the first bag body, and the opening of the second bag body 56 is sealed by heat welding with the inside depressurized as described above. Then, by heating the second bag body 56, an adhesive layer 58 for adhering the first bag body 54 and the second bag body 56 can be formed.
It is not necessary to provide the adhesive layer 58 on all the facing surfaces of the first bag body 54 and the second bag body 56, and if the second bag body 56 can be fixed to the first bag body 54, it will be partially provided. It may be provided.

Further, the adhesive layer 58 for adhering the first bag body 54 and the second bag body 56 is not limited to the heat-adhesive sheet as described above, and for example, after sealing the opening of the second bag body 56, the heater heat is applied. It may be formed by welding, ultrasonic welding, laser welding, high-frequency welding, or the like.

Further, in the present embodiment, after the first bag body 54 is housed inside the second bag body 56, the first bag body 54 and the second bag body 56 are bonded with a double-sided adhesive tape, and then the inside is depressurized. By sealing the opening of the second bag body 56 in this state, the inside of the second bag body 56 containing the first bag body 54 is sealed under reduced pressure, and the first bag body 54 and the second bag body 56 are sealed. An adhesive layer 58 may be provided between the two.

Further, in the present embodiment, if necessary, when the first bag body 54 and the second bag body 56 are bonded to each other, the second bag body 56 is attached to the adhesive layer 58 provided between the first bag body 54 from the outside. You may press it toward it.

Further, in the above-described embodiment, the case where the laminated film forming the first bag body 54 and the laminated film forming the second bag body 56 are made of the same film has been described. For example, the first bag body 54 has been described. The surface protective layer 54a located on the outer surface of the bag and forming an adhesive surface with the second bag 56 and the heat welding layer 56c located on the inner surface of the second bag 56 and forming an adhesive surface with the first bag 54 are the same. The surface protective layer 54a of the first bag 54 and the heat-welding layer 56c of the second bag 56, which are made of a material or form an adhesive surface, may be subjected to corona treatment, whereby the first bag 54 and the first bag 54 and the second bag 56c may be subjected to corona treatment. 2 The adhesiveness with the bag body 56 can be improved.

In particular, when the first bag body 54 and the second bag body 56 are bonded by heater heat welding, ultrasonic welding, laser welding, high frequency welding, etc., the surface of the laminated film forming the first bag body 54 is protected. By forming the layer 54a with the same synthetic resin as the heat welding layers 54c and 56c, welding becomes easy, and the adhesiveness between the first bag body 54 and the second bag body 56 can be improved.

In the refrigerator 10 of the present embodiment as described above, the vacuum heat insulating panel 50 provided in the heat insulating space of the cabinet 18 accommodates the first bag body 54 for accommodating the core material 52 and the second bag body 54 for accommodating the first bag body 54. A bag body 56 is provided, and the insides of the first bag body 54 and the second bag body 56 are vacuum-sealed, and the core material 52 is double-pressure-sealed by the first bag body 54 and the second bag body 56. Therefore, even if one of the bags is damaged, the outside air does not enter the inside of the bag and the heat insulating performance is not deteriorated.

Further, in the vacuum heat insulating panel 50, the second bag body 56 constituting the outer surface thereof is fixed to the outer box 12 and the inner box 16 by an adhesive or a foamed heat insulating material 20, so that the core material 52 has a relatively high rigidity. Can be integrated with the cabinet 18 to increase the rigidity of the cabinet 18.

Moreover, when the second bag body 56 is not fixed to the first bag body 54, if the second bag body 56 is damaged and external air enters the inside of the second bag body 56, it is accommodated in the first bag body 54. The core material 52 is not fixed to the outer box 12 or the inner box 16, and the rigidity of the cabinet 18 may decrease. However, in the present embodiment, the first bag body 54 and the second bag body 56 are adhered to each other. Therefore, even if outside air may enter the inside of the second bag body 56, the first bag body 54 and the core material 52 existing inside the first bag body 54 are maintained in a state of being integrated with the cabinet 18. This can be done, and the rigidity of the cabinet 18 does not decrease.

Since the adhesive layer 58 is provided in a region that does not overlap with the folded portions 62 and 64, it is possible to prevent the thickness of the vacuum heat insulating panel 50 from being partially increased due to the overlapping of the folded portions 62 and 64 and the adhesive layer 58. can.

The vacuum insulation panel placed on the back or side of the refrigerator 10 that comes into contact with a vacuum insulation panel such as a refrigerant pipe and comes into direct contact with a member that may damage the vacuum insulation panel is a vacuum insulation panel that is double decompressed and sealed. For the vacuum insulation panel to be placed in the place where the vacuum insulation panel needs to be bent greatly when pasting on the ceiling surface or the bottom surface, a single vacuum insulation panel is used. As a result, the manufacturing cost of the refrigerator can be kept low as compared with the case where all the vacuum heat insulating panels are double pressure-sealed.

Further, by double decompressing and sealing a vacuum insulation panel having a size larger than that of the ceiling surface or bottom surface such as the back surface and side surface of the refrigerator 10, a large vacuum insulation panel having a size that is more likely to be damaged can be obtained. Damage can be prevented more reliably.

Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

10 ... Refrigerator, 12 ... Outer box, 14 ... Inner box, 18 ... Cabinet, 20 ... Foam insulation, 22 ... Insulation partition, 50 ... Vacuum insulation panel, 52 ... Core material, 52a ... Laminated material, 52b ... Inner bag, 54 ... 1st bag body, 54a ... Surface protective layer, 54b ... Gas barrier layer, 54c ... Welding layer, 56 ... Second bag body, 56a ... Surface protective layer, 56b ... Gas barrier layer, 56c ... Welding layer, 58 ... Adhesive layer , 62 ... Folded part, 64 ... Folded part

Claims (2)

A core material, a first bag body whose inside is vacuum-sealed while containing the core material, and a second bag body whose inside is pressure-reduced sealed while containing the first bag body whose inside is pressure-reduced. In a vacuum insulation panel in which the first bag body and the second bag body are bonded to each other in a flat portion.
The first bag body and the second bag body are made of a laminated film in which a plurality of films are laminated.
A vacuum heat insulating panel in which the surface of the first bag body bonded to the second bag body is made of the same material as the surface of the second bag body bonded to the first bag body. In a refrigerator equipped with a heat insulating box body in which a vacuum heat insulating panel is provided between the outer box and the inner box.
The vacuum heat insulating panel has a core material, a first bag body whose inside is vacuum-sealed with the core material housed, and a first bag body whose inside is pressure-pressure sealed. The first bag body and the second bag body are bonded to each other in a flat portion, and the first bag body and the second bag body are laminated films in which a plurality of films are laminated. A refrigerator in which the surface of the first bag body bonded to the second bag body is made of the same material as the surface of the second bag body bonded to the first bag body.

Images