JP6886073B2 - Insulation - Google Patents

Description

The present invention relates to a heat insulating body provided with a vacuum heat insulating material and suitable for heat insulating a freezing and refrigerating apparatus.

Conventionally, a heat insulating body has been used for various purposes in order to efficiently use heat energy.

For example, in a freezing / refrigerating device, a main body of the device, that is, a box body surrounding an internal space (internal space) is configured as a heat insulating body (heat insulating box body).

FIG. 7 shows an example of a heat insulating box. The heat insulating box body shown in FIG. 7 is fixed in contact with the inner box 121 forming the inner space thereof, the outer box 122 forming the outer surface thereof, and the inner wall surface of the outer box 122 (the wall surface of the inner box 121). The vacuum heat insulating material 160 is provided, and the foam heat insulating material 170 filled between the inner box 121 and the outer box 122 is provided.

The vacuum heat insulating material 160 is obtained by storing the core material 161 inside the bag body formed by joining the peripheral edges of the two films 162, and then reducing the pressure inside the bag body to seal the core material 161. A laminated film provided with a gas barrier layer is used for the film 162 so that the depressurized state inside the bag body can be maintained satisfactorily.

A metal (for example, aluminum foil) is used for the gas barrier layer because it has a high gas barrier property. Since metal has high thermal conductivity, when the film 162 comes into contact with the inner box 121 or the outer box 122 (outer box 122 in this example) as shown in FIG. 7, a heat bridge (heat bridge) is provided by the metal gas barrier layer. Will occur and the heat insulation performance will deteriorate.

That is, as shown by the arrow L, the heat in the refrigerator space is transmitted to the outside in the order of the film 162 and the outer box 122, and as shown by the arrow H, the heat outside the refrigerator is transmitted to the outer box 122 and the film 162. It is transmitted in the order of, and enters the interior space.

In order not to generate a heat bridge, it is necessary to separate the vacuum heat insulating material from both the inner box and the outer box. Although the heat insulating wall disclosed in FIG. 2 of Patent Document 1 is not specified, the vacuum heat insulating material is separated from both the inner box and the outer box, and the vacuum heat insulating material, the inner box and the outer box are foamed between each other. It is presumed that the heat insulating material is filled.

Japanese Unexamined Patent Publication No. 2014-025536

In order to manufacture the heat insulating wall disclosed in Patent Document 1, the vacuum heat insulating material is supported by a support in the hollow space between the inner box and the outer box, and the foam heat insulating material is formed in this hollow space. It is necessary to inject a liquid material, which is a raw material, and foam it.

However, when the liquid material is injected and foamed (when the foamed heat insulating material is formed), the place where the support is arranged becomes a void (cavity) without the foamed heat insulating material, which causes deterioration of product quality. It is technically difficult to support the vacuum heat insulating material in the hollow space between the inner box and the outer box so that such voids do not occur.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a heat insulating body which can prevent the occurrence of heat bridges and is easy to manufacture.

In order to achieve the above object, the heat insulating body of the present invention includes a first heat insulating block, a second plate, and a second heat insulating block.

The first heat insulating block has a first plate, a vacuum heat insulating material arranged apart from the first plate in a predetermined direction, and a joining material for joining the first plate and the vacuum heat insulating material.

The second plate is arranged away from the first heat insulating block in the predetermined direction.

The second heat insulating block is provided so as to fill the space between the first heat insulating block and the second plate. The first plate is the inner box of the freezing and refrigerating device. The second plate is the outer box of the freezing and refrigerating device. The heat insulating material further includes a pipe arrangement portion in which the evaporation pipe of the freezing and refrigerating apparatus is arranged. The pipe arranging portion is formed by arranging a plurality of joining materials with a gap where the evaporation pipe is arranged.

According to the present invention, the occurrence of a heat bridge can be prevented and the product can be easily manufactured.

FIG. 1A is a front view of the ultra-low temperature freezer. FIG. 1B is a right side view of the ultra-low temperature freezer. FIG. 1C is a plan view of the ultra-low temperature freezer. FIG. 2 is a view corresponding to a cross-sectional view taken along the line AA of FIG. 1C. FIG. 3 is a view corresponding to a cross-sectional view taken along the line AA of FIG. 1C. FIG. 4A is a cross-sectional view of a main part of the first heat insulating block. FIG. 4B is a view corresponding to a cross-sectional view taken along the line AA of FIG. 1C. FIG. 5 is a view corresponding to a cross-sectional view taken along the line AA of FIG. 1C. FIG. 6 is a view corresponding to a cross-sectional view taken along the line AA of FIG. 1C. FIG. 7 is a cross-sectional view showing an example of a conventional heat insulating box.

Hereinafter, the heat insulating body according to the embodiment of the present invention will be described with reference to the drawings. Each of the following embodiments is merely an example, and does not exclude the application of various modifications and techniques not specified in each of the following embodiments. In addition, each configuration of each embodiment can be variously modified and implemented without departing from the gist thereof. Further, each configuration of each embodiment can be selected as needed, or can be combined as appropriate.

In the following description, the surface of the inner box 21 on the outer box 22 side is referred to as an inner surface, and the surface on the opposite side (inside the refrigerator) is referred to as an outer surface. Similarly, the surface of the outer box 22 on the inner box 21 side is referred to as an inner surface, and the surface on the opposite side thereof is referred to as an outer surface.
In addition, in all the drawings for explaining each embodiment, in principle, the same elements are designated by the same reference numerals, and the description thereof may be omitted.

[1. Ultra-low temperature freezer]
Hereinafter, the configuration of the ultra-low temperature freezer 10 (freezing / refrigerating device) according to each embodiment of the present invention will be described with reference to FIGS. 1A, 1B and 1C. 1A, 1B and 1C are a front view, a right side view and a plan view of the ultra-low temperature freezer 10, respectively.

The ultra-low temperature freezer 10 includes a machine storage unit 11 and a main body 12 provided above the machine storage unit 11.

Inside the machine storage unit 11, various devices and control units that make up the refrigeration circuit are arranged.

The main body 12 has a box body 20 and a door 30 attached to the front side of the box body 20 so as to be openable and closable. The door 30 is attached to the box body 20 via a hinge 31. Further, the door 30 is provided with an operation unit 32 into which an instruction for the ultra-low temperature freezer 10 is input and a knob 33. By operating the knob 33, the door 30 is opened, as shown by the broken line in FIG. 1C.

[2. First Embodiment]
[2-1. Constitution]
Hereinafter, the configuration of the box body according to the first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram corresponding to a cross-sectional view taken along the line AA of FIG. 1C. The box body 20 of the present embodiment is composed of the box body 20A (insulation body) shown in FIG.

The box body 20A is between the first heat insulating block A1, the inner box 21 (second plate) arranged apart from the first heat insulating block A1 in a predetermined direction X, and the first heat insulating block A1 and the inner box 21. A second heat insulating block A2 provided so as to fill the space is provided.

The first heat insulating block A1 joins the outer box 22 (first plate), the vacuum heat insulating material 60 arranged apart from the outer box 22 in a predetermined direction X, and the outer box 22 and the vacuum heat insulating material 60. It has a foam heat insulating material 70 (bonding material) that contributes. Specifically, the first heat insulating block A1 includes an outer box 22, a double-sided adhesive 81 (first adhesive layer), a foam heat insulating material 70, a double-sided adhesive 82 (second adhesive layer), and a vacuum heat insulating material 60. Are stacked in this order.

One surface of the double-sided adhesive 81 is adhered to the inner surface 22i of the outer box 22, and the other surface is adhered to the foamed heat insulating material 70. That is, the outer box 22 and the foamed heat insulating material 70 are joined via the double-sided adhesive 81.

The foam heat insulating material 70 is provided so as to fill the space between the outer box 22 and the vacuum heat insulating material 60, and joins the outer box 22 and the vacuum heat insulating material 60 in cooperation with the double-sided adhesives 81 and 82. The foamed heat insulating material 70 is formed of a foamed resin molded product such as polyurethane foam or polyethylene foam.

One side of the double-sided adhesive 82 is adhered to the foam heat insulating material 70, and the other surface is adhered to the vacuum heat insulating material 60. That is, the foam heat insulating material 70 and the vacuum heat insulating material 60 are joined via the double-sided adhesive 82.

The vacuum heat insulating material 60 is obtained by storing the core material 61 inside the bag body formed by joining the peripheral edges of the two films 62, and then reducing the pressure inside the bag body to seal the core material 61. A laminated film provided with a metal gas barrier layer (for example, aluminum foil) is used for the film 62 so that the depressurized state inside the bag body can be maintained satisfactorily.

The second heat insulating block A2 is a foamed heat insulating material 71, and is formed of a foamed resin molded body (for example, urethane foam).

The inner surface 21i of the inner box 21 is a pipe arranging portion. That is, a plurality of evaporation pipes (hereinafter referred to as "evaporation pipes") 51 of the ultra-low temperature freezer 10 extending in the direction perpendicular to the paper surface of FIG. 2 are installed on the inner surface 21i. The EVA pipe 51 is, for example, a copper or aluminum pipe for evaporating the refrigerant in the refrigerating circuit, and is attached so as to be in thermal contact with the inner surface 21i of the inner box 21 to cool the inner box 21. The EVA pipe 51 is fixed to the inner surface 21i by the aluminum tape 52.

The foamed resin molded body forming the foamed heat insulating material 70 and the foamed resin molded body forming the second heat insulating block A2 may be made of materials having the same physical property values such as density and thermal conductivity. , Materials having different physical property values may be used.

[2-2. effect]
According to the box body 20A of the first embodiment of the present invention, since the foam heat insulating material 70 is provided between the outer box 22 and the vacuum heat insulating material 60, it is caused by the film 62 of the vacuum heat insulating material 60. , It is possible to prevent the heat bridge from being generated between the outer box 22 and the vacuum heat insulating material 60. Further, in a state where a space is provided between the first heat insulating block A1 and the inner box 21, a liquid material which is a raw material of the foamed heat insulating material 71 forming the second heat insulating block A2 is injected into this space and foamed. If the second heat insulating block A2 is provided, the box body 20A can be easily manufactured.

[3. Second embodiment]
[3-1. Constitution]
Hereinafter, the configuration of the box body of the second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a view corresponding to a cross-sectional view taken along the line AA of FIG. 1C. The box body 20 of the present embodiment is composed of the box body 20B (insulation body) shown in FIG.

Since the configuration of the first heat insulating block B1 is different from that of the first embodiment of the box body 20B, the configuration of the first heat insulating block B1 will be mainly described.

The first heat insulating block B1 includes an outer box 22, a double-sided adhesive 81, a foam heat insulating material 72 (bonding material) formed of a foamed resin molded body such as polyurethane foam or polyethylene foam, and a vacuum heat insulating material 60. It is configured so that it can be stacked in order.

The foam heat insulating material 72 is formed so as to cover the vacuum heat insulating material 60, leaving the surface 63 on the inner box 21 side of the vacuum heat insulating material 60. Specifically, the foam heat insulating material 72 fills the gap between the outer box 22 and the vacuum heat insulating material 60, and the bottom surfaces 63, 72a of the vacuum heat insulating material 60 and the foam heat insulating material 72 on the inner box 21 side. Are formed flush with each other (so that they are aligned in the thickness direction).

With such a configuration, the vacuum heat insulating material 60 is held by the foam heat insulating material 72. That is, the surface of the foam heat insulating material 72 in contact with the vacuum heat insulating material 60 functions as the holding portion 72b for holding the vacuum heat insulating material 60. As a result, the vacuum heat insulating material 60 is joined to the outer box 22 via the foam heat insulating material 72 and the double-sided adhesive 81.

The foam heat insulating material 72 is preferably formed so as to cover the vacuum heat insulating material 60 at least on the paper surface of FIG. 3 below the seal portion (so-called ear portion) of the film 62. As a result, the foam heat insulating material 72 can stably hold the vacuum heat insulating material 60. Further, before forming the second heat insulating block B2, the surface state of the first heat insulating block B1 (for example, the presence or absence of gaps and voids) can be visually confirmed.

The foam heat insulating material 72 has a shape as shown in FIG. 2 by injecting a liquid material, which is a raw material of the foam heat insulating material, around the vacuum heat insulating material 60 placed on the mold using a jig and foaming the foam heat insulating material 72. Can be easily molded.

The second heat insulating block B2 is provided so as to fill the space between the first heat insulating block B1 and the inner box 21. The second heat insulating block B2 is a foamed heat insulating material and is formed of a foamed resin molded product (for example, urethane foam).

The foamed resin molded body forming the foamed heat insulating material 72 and the foamed resin molded body forming the second heat insulating block B2 may be made of materials having the same physical property values such as density and thermal conductivity. , Materials having different physical property values may be used.

Since other configurations are the same as those of the first embodiment, the description thereof will be omitted.

[3-2. effect]
According to the box body 20B of the second embodiment of the present invention, in addition to the same effect as that of the first embodiment, the foam heat insulating material 72 and the vacuum heat insulating material 60 are integrated at the same time as forming the foam heat insulating material 72. Therefore, the production of the box body 20B can be simplified.

[4. Third Embodiment]
[4-1. Constitution]
Hereinafter, the configuration of the box body of the third embodiment of the present invention will be described with reference to FIGS. 4A and 4B. FIG. 4A is a cross-sectional view of a main part of the first heat insulating block C1 of the box body, and FIG. 4B is a view corresponding to a cross-sectional view taken along the line AA of FIG. 1C. The box body 20 of the present embodiment is composed of the box body 20C (insulation body) shown in FIG. 4B.

The box body 20C is located between the first heat insulating block C1, the outer box 22 (second plate) arranged apart from the first heat insulating block C1 in a predetermined direction Y, and between the first heat insulating block C1 and the outer box 22. A second heat insulating block C2 provided so as to fill the space is provided.

The first heat insulating block C1 joins the inner box 21 (first plate), the vacuum heat insulating material 60 arranged apart from the inner box 21 in a predetermined direction Y, and the inner box 21 and the vacuum heat insulating material 60. It has a foam heat insulating material 74 (bonding material) that contributes. Specifically, the first heat insulating block C1 includes an inner box 21, a double-sided adhesive 84 (first adhesive layer), a foam heat insulating material 74, a double-sided adhesive 85 (second adhesive layer), and a vacuum heat insulating material 60. Are stacked in this order.

The double-sided adhesive 84 is provided at a position away from the recess d1 of the foamed heat insulating material 74, which will be described later. One side of each double-sided adhesive 84 is adhered to the inner surface 21i of the inner box 21, and the other surface is adhered to the foamed heat insulating material 74. That is, the inner box 21 and the foamed heat insulating material 74 are joined via the double-sided adhesive 84.

The foam heat insulating material 74 is provided so as to fill the space between the inner box 21 and the vacuum heat insulating material 60, and joins the inner box 21 and the vacuum heat insulating material 60 in cooperation with the double-sided adhesives 84 and 85. Since the foamed heat insulating material 74 is attached to the inner surface 21i of the inner box 21, the foamed heat insulating material 74 is provided with a recess d1 in advance so as not to interfere with the EVA pipe 51 also attached to the inner surface 21i. There is. In other words, the foamed heat insulating material 74 is provided with a recess d1 that opens toward the inner surface 21i of the inner box 21 as a pipe arranging portion. The foamed heat insulating material 74 is formed of a foamed resin molded product such as polyurethane foam or polyethylene foam.

If the foamed heat insulating material 74 has sufficient flexibility, the foamed heat insulating material 74 pressed against the EVA pipe 51 is deformed along the shape of the EVA pipe 51, so that the recess d1 can be omitted.

One side of the double-sided adhesive 85 is bonded to the foam heat insulating material 74, and the other side is bonded to the vacuum heat insulating material 60. That is, the foam heat insulating material 74 and the vacuum heat insulating material 60 are joined via the double-sided adhesive material 85.

The second heat insulating block C2 is a foamed heat insulating material and is formed of a foamed resin molded product (for example, urethane foam).

The foamed resin molded body forming the foamed heat insulating material 75 and the foamed resin molded body forming the second heat insulating block C2 may be made of materials having the same physical property values such as density and thermal conductivity. , Materials having different physical property values may be used.

Since other configurations are the same as those of the first embodiment, the description thereof will be omitted.

[4-2. effect]
According to the box body 20C of the third embodiment of the present invention, the same effect as that of the first embodiment can be obtained.

[5. Fourth Embodiment]
[5-1. Constitution]
Hereinafter, the configuration of the box body of the fourth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a view corresponding to a cross-sectional view taken along the line AA of FIG. 1C. The box body 20 of the present embodiment is composed of the box body 20D (insulation body) shown in FIG.

The box body 20D shown in FIG. 5 has a configuration of the first heat insulating block D1 different from that of the box body 20C of the third embodiment shown in FIG. 4B.

Specifically, the first heat insulating block D1 is obtained by replacing the foamed heat insulating material 74 with the foamed heat insulating material 76 (bonding material) in the first heat insulating block C1 of the third embodiment.

The foamed heat insulating material 76 is provided with a penetrating portion d2 penetrating in the thickness direction as a pipe arranging portion at a location where the EVA pipe 51 is arranged. In other words, the foamed heat insulating material 76 is composed of a plurality of foamed heat insulating materials 76a arranged with a gap corresponding to the penetrating portion d2, and the portion provided with the gap functions as a pipe arranging portion.

The foamed heat insulating material 76 is formed of a foamed resin molded product such as polyurethane foam or polyethylene foam, similarly to the foamed heat insulating material 74 of the third embodiment.

Further, a double-sided adhesive 87 (second adhesive layer) for joining the foam heat insulating material 76a and the vacuum heat insulating material 60 is provided between each foam heat insulating material 76a and the vacuum heat insulating material 60, respectively.

The foamed resin molded body forming the foamed heat insulating material 76 and the foamed resin molded body forming the second heat insulating block C2 may be made of materials having the same physical property values such as density and thermal conductivity. , Materials having different physical property values may be used.

Since other configurations are the same as those of the third embodiment, the description thereof will be omitted.

[5-2. effect]
According to the box body 20D of the fourth embodiment of the present invention, the same effect as that of the third embodiment can be obtained.

[6. Fifth Embodiment]
[6-1. Constitution]
Hereinafter, the configuration of the box body according to the fifth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a diagram corresponding to a cross-sectional view taken along the line AA of FIG. 1C. The box body 20 of the present embodiment is composed of the box body 20E (insulation body) shown in FIG.

The structure of the first heat insulating block E1 of the box body 20E is different from that of the third embodiment shown in FIG.

Specifically, the first heat insulating block E1 is obtained by replacing the foamed heat insulating material 74 with the foamed heat insulating material 78 (bonding material) in the first heat insulating block C1 of the third embodiment.
In the foamed heat insulating material 78, the recess d1 which is the pipe arrangement portion is omitted in the foamed heat insulating material 74, and the outer surface (the surface inside the refrigerator) is a flat surface. The foamed heat insulating material 78 and the inner box 21 are joined by the double-sided adhesive 88 (first adhesive layer) provided between the flat surface and the inner box 21.

The foamed heat insulating material 78 is formed of a foamed resin molded product such as polyurethane foam or polyethylene foam, similarly to the foamed heat insulating materials 74 and 76.

Further, in the first heat insulating block E1, a double-sided adhesive 89 (second adhesive layer) is provided on the entire outer surface of the foam heat insulating material 78, and the vacuum heat insulating material 60 and the foam heat insulating material 78 are provided by the double-sided adhesive 89. Are joined.

Further, instead of the foamed heat insulating material 78 not being provided with the pipe arranging portion, the outer surface 21o (the surface inside the refrigerator) of the inner box 21 constitutes the pipe arranging portion. That is, the EVA pipe 51 is fixed to the outer surface 21o by the aluminum tape 52.

Further, in order to hide the EVA pipe 51, another inner box 23 is provided inside the chamber of the EVA pipe 51.

The foamed resin molded body forming the foamed heat insulating material 78 and the foamed resin molded body forming the second heat insulating block C2 may be made of materials having the same physical property values such as density and thermal conductivity. , Materials having different physical property values may be used.

Since other configurations are the same as those of the third embodiment, the description thereof will be omitted.

[6-2. effect]
According to the box body 20E of the fourth embodiment of the present invention, the same effect as that of the third embodiment can be obtained.

[7. Others]
(1) In each of the above embodiments, the adhesive layer is made of a double-sided adhesive, but the adhesive layer may be formed by applying an adhesive.
(2) In each of the above embodiments, the joining material for joining the outer box 22 or the inner box 21 and the vacuum heat insulating material 60 is a foamed heat insulating material formed of a foamed resin molded body, but the joining material is Not limited to the foam heat insulating material, various materials can be used. However, those having a heat insulating function are preferable in the use of the heat insulating body.

(3) In the third to fifth embodiments, the vacuum heat insulating material 60 is fixed to the foam heat insulating material 74,76,78 by using the double-sided adhesive 85, 87, 89, but the double-sided adhesive 85, 87, 89 Alternatively, the foam heat insulating material 74, 76, 78 may be provided with a holding portion for holding the vacuum heat insulating material 60 as in the second embodiment.

(4) In each of the above embodiments, an example in which the heat insulating body of the present invention is used in a freezing / refrigerating device has been described, but the heat insulating body of the present invention is not limited to the freezing / refrigerating device, and various devices requiring heat insulation and the like. It can be applied to equipment.

The disclosures of the specifications, drawings and abstracts contained in the Japanese application of Japanese Patent Application No. 2018-046313 filed on March 14, 2018 are all incorporated herein by reference.

According to the present invention, it is possible to provide a heat insulating body which can prevent the occurrence of heat bridges and can be easily manufactured. Therefore, its industrial applicability is enormous.

10 Ultra-low temperature freezer (freezer / refrigerator)
11 Machine storage 12 Ultra-low temperature freezer body 20, 20A-20E Box body (insulation body)
21 Inner box (first plate, second plate)
23 Second inner box 21i Inner surface of inner box 21 21o Outer surface of inner box 21 22 Outer box (first plate, second plate)
22i Inner surface of outer box 22 30 Door 31 Hinge 32 Operation unit 33 Knob 51 Evaporation pipe (Evaporation pipe)
52 Aluminum tape 60 Vacuum heat insulating material 61 Core material 62 Film 63 Surface of the vacuum heat insulating material 60 on the inner box 21 side 70,71,72,74,76,78 Foam heat insulating material (bonding material, foamed resin molded body)
72a Effervescent heat insulating material 72 inner box 21 side surface 72b Holding part 81, 84, 88 Double-sided adhesive (first adhesive layer)
82, 85, 87, 89 Double-sided adhesive (second adhesive layer)
A1, B1, C1 1st heat insulation block A2, B2, C2 2nd heat insulation block d1 Recess (pipe arrangement part)
d2 Penetration part (pipe arrangement part)
X, Y predetermined direction

Claims (6)

A first heat insulating block having a first plate, a vacuum heat insulating material arranged apart from the first plate in a predetermined direction, and a joining material for joining the first plate and the vacuum heat insulating material.
A second plate arranged away from the first heat insulating block in the predetermined direction,
A second heat insulating block provided so as to fill the space between the first heat insulating block and the second plate is provided .
The first plate is an inner box of a freezing / refrigerating device.
The second plate is an outer box of the freezing and refrigerating device.
Further provided with a pipe arrangement portion in which the evaporation pipe of the freezing and refrigerating apparatus is arranged,
The pipe arranging portion is a heat insulating body formed by arranging a plurality of the joining materials with a gap where the evaporation pipe is arranged. The heat insulating body according to claim 1, wherein the second heat insulating block is formed of a foamed resin molded body. The heat insulating body according to claim 1 or 2, wherein the bonding material is formed of a foamed resin molded body. The heat insulating body according to any one of claims 1 to 3, wherein the first heat insulating block further includes a first adhesive layer provided between the first plate and the joining material. The heat insulating body according to any one of claims 1 to 4, wherein the first heat insulating block further includes a second adhesive layer provided between the joining material and the vacuum heat insulating material. The heat insulating body according to any one of claims 1 to 4, wherein the joining material includes a holding portion for holding the vacuum heat insulating material.

Images