JPH1183296A - Thermal insulation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of a detect caused by a foaming pressure and foaming adhesion when a foaming process is not employed by coating a regular shape core material with a foamed body having independent foams to form a thermal insulation material being press fitted in a case. SOLUTION: A planar regular shape urethane board is admixed with an adsorbing material to form a vacuum thermal insulation board being employed as a core material 21. The core material 21 is coated with a foam material 22 formed having independent foam and press fitted in a case 1. Since an appropriate elasticity is provided by independent foam, the foam material 22 is easily deformable locally and press fitted easily in the case 1. An appropriate contact pressure can be left between inner and outer shells 11, 12 after press fitting. Since a foaming process is eliminated from the production process, no jig therefor is required and the production is facilitated. Furthermore, since a high pressure, e.g. foaming pressure, is not generated, the material can be protected against damage due to miss during production.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating structure having a heat insulating material in a case, and is used for a heat insulating panel, a heat insulating door, a heat insulating box, etc. of a thermostat, a thermostat, a refrigerator, a refrigerator, a refrigerator, etc. You.

[0002]

2. Description of the Related Art Conventionally, a heat insulating structure such as a heat insulating box has been manufactured by directly injecting a heat insulating material into a space formed by inner and outer shells made of metal or resin and foaming it. Recently, a method of manufacturing a heat insulating structure by inserting a vacuum heat insulating board having particularly excellent heat insulating performance between the inner and outer shells, and injecting and foaming and filling a heat insulating material into these gaps has also been used. However, such a manufacturing method may cause construction defects such as leakage of the foaming material at the time of injection foaming. However, at this time, due to the strong adhesive action of the injection foaming, the inner and outer shells also become defective at the same time. Problem occurs. In addition, there is a problem in the product that the foaming pressure and the adhesive force, both of which become large values, act unevenly, and the surface of the shell structure made of a thin plate becomes uneven and uneven.

[0003] On the other hand, as a method of manufacturing a heat insulating structure not using injection foaming, a gas permeable foam heat insulating material is attached around a vacuum heat insulating material, the surrounding is covered with an airtight bag, and the inside is made negative pressure. A method has been proposed in which the pressure is reduced and inserted into the housing, and then returned to the atmospheric pressure (see Japanese Utility Model Application Laid-Open No. 60-159296). However, in this method, since the foamed heat insulating material needs to have air permeability, there is a problem that, when used as a heat insulating structure, dew condensation occurs on the heat insulating material due to conduction of air.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and has a heat insulating structure in which no defective products are generated, the formed surface is uniform and of good quality, and the occurrence of dew condensation is prevented. The task is to provide the body.

[0005]

In order to solve the above-mentioned problems, the present invention provides a heat insulating structure having a heat insulating material in a case, wherein the heat insulating material comprises a core material having a fixed shape. The core is covered with a foam having independent cells and is press-fitted into the case.

According to a second aspect of the present invention, in addition to the above, there is provided a tube disposed between the case and the foam and guided to the outside.

According to a third aspect of the present invention, in addition to the features of the first aspect, the foam is coated with an adhesive having lubricity at the time of press-fitting and is press-fitted into the case. I do.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a heat insulating structure to which the present invention is applied. FIG. 1A shows the entire structure of a heat insulating box 100 assembled with the heat insulating structure to form a constant temperature chamber and the like.
(B) is the state of the cross section. 2 (a) to 2 (c) show the state of the cross section of the case and the separated heat insulating material before assembling and the shape of the heat insulating material, respectively. The heat insulating structure has a heat insulating material 2 in a case 1 formed by an inner shell 11 and an outer shell 12 made of metal or resin. Insulation material 2
Is a core material 21 made of a vacuum heat insulating board formed by mixing an adsorbent into a plate-like urethane board having a fixed shape, for example.
And a foam material 22 which is a foam covering the foam and having independent cells, and is pressed into the case 1.

Therefore, before the heat insulating material 2 is pressed into the case 1, the heat insulating material 2 is formed to have thicknesses t ₁ + δ ₁ and t ₂ + δ ₂ larger than the inner widths t ₁ and t ₂ of the case. .
δ ₁ and δ ₂ are the material and thickness of the inner and outer shells 11 and 12 and the heat insulating material 2
Although it depends on the degree of elasticity, it is about several percent. In this case, since the foam material 22 is a closed-cell foam material, the foam material has appropriate elasticity and is easily deformed locally because of the bubbles, so that it is easy to press-fit the inside of the case. An appropriate contact pressure remains between the contact holes 11 and 12.

In such a heat insulating structure, the foam material 2
2 is formed by foaming separately from the case 1 and is pressed against the case 1 but is not in a firmly bonded state due to foaming. Since the foam material 22 is formed integrally with the core material 21 to form the heat insulating material 2, the foam material 22 is bonded between the divided portions and the core material 21. However, the heat insulating material 2 including the core material 21 may be integrally formed by foam molding.

The heat insulating material 2 is formed in an independent board shape as shown in FIG. 2 (c).
As shown by arrows in FIG. 3, the inner and outer cases are separately press-fitted on both sides, up and down, and back, or are appropriately press-fitted in advance into an L-shape or square shape by bonding or fusion. Press-fitting from other directions than the arrow is also possible. When the heat insulating materials 2 are separately press-fitted, the open side portion of the case between them is sealed by bonding or the like after press-fitting. The opening of the case 1 in which the heat insulating material 2 is placed is covered with the end member, and the joint is sealed with an adhesive or an appropriate sealing material. As the core material 21, other materials such as a plate-shaped rigid polyurethane foam can be used in addition to the vacuum heat insulating material.

According to the heat insulating structure as described above, since there is no foaming step in the manufacturing stage, a jig for that is not required, and the manufacturing becomes easy. Also, since the case and the heat insulating material are pressed against each other, there is no intrusion and condensation of moisture and moisture,
Dew condensation is prevented, and good heat insulation performance can be maintained. Further, according to the press-fitting assembly, since a large pressure such as a foaming pressure does not occur, the raw material is not damaged by a mistake in the production, and the yield of the product can be improved.

Further, since the heat insulating structure is integrated with the case by press-fitting instead of foaming, the inner and outer shells 11 and 12 receive a uniform pressing force from the heat insulating material having closed cells as a whole. Then, since there is no binding due to the adhesion between the two as in the injection foaming method, the inner and outer shells are in a uniform tensile stress state, and the surface does not stick. Therefore, the quality of the heat insulating structure is improved.

When a vacuum heat insulating material is used as the core material, its surface is protected by the surrounding foam material.
Damage is eliminated, the durability of the heat insulation performance is improved, and the handling is facilitated. On the other hand, even when a breathable core material is used, the periphery thereof is covered with a closed-cell foam material, so that the heat insulating material as a whole has airtight performance with no breathability, and the seal portion is reduced. Also makes it easier to manufacture.

Further, in the above-mentioned heat-insulating structure, the case 1 and the heat-insulating material 2 are adhered to each other only by the sealing portion, so that the separation between the two is extremely easy, and the handleability at the time of product disposal is easy. Will be better. Therefore, a product suitable for environmental protection can be obtained.

FIG. 3 shows an example in which piping is installed in a heat insulating box. As a tube arranged between the case 1 and the foam material 22 and guided to the outside, as shown schematically in FIG. It is arranged. Even if such pipes are present in the inner and outer shells 11 and 12, the heat insulating material 2 can be press-fitted into the case 1 due to local deformation of the foam 22 having closed cells and flexibility of restoration after the deformation. At the same time, after the press-fitting, the foam material comes into pressure contact with the periphery of the pipe, and the heat insulating performance to the outside is maintained.

In particular, when a vacuum heat insulating material is used, the pipe work can be taken out while protecting the vacuum heat insulating material without penetrating or partially damaging the pipe, so that the pipe work becomes extremely easy. . Although not shown, other pipes such as a heating pipe for preventing dew condensation can be inserted into the outer shell 12 as necessary.

FIG. 3 shows another example of the heat insulating structure. In the present example, the foam material 22 itself is formed to have substantially the same thickness as the inner width of the case 1 and inserted into the case. However, a space for press-fitting the core material 21 is provided at the center of the foam material 22. I have. Then, a core material 21 whose surface is covered with a slippery sheet material 4 such as a film and is formed to have a width slightly larger than the space width is slid into the space and press-fitted therein so as to be integrated as a heat insulating structure. I have.
As a result, the core material 21 pushes and spreads the foam material 22, and the heat insulating material 2 is pressed into the whole. According to this method, the press-fitting operation of the heat insulating material is facilitated. As shown by the two-dot chain line in FIG.
May be inserted in the space.

It should be noted that in the heat insulating structure as described above,
When the foam material 22 is press-fitted into the inner and outer shells 11 and 12 or the core material 21 is integrated with the foam material 22 by press-fitting, an adhesive having lubricity is applied to the surface of the foam material 22 at the time of press-fitting. You may. Adhesives usually have a certain degree of fluidity and therefore have lubricity, so if they do not dry quickly and can maintain this state for a certain period of time,
It can be used as an adhesive for the above purpose. Further, for example, a rubber-based adhesive having a strong adhesive force may be diluted with a solvent to increase the fluidity and delay the solidification / adhesion time before use.

When such an adhesive is used, since the foam material 22 has closed cells, it is easy to press-fit even if it is flexible and difficult to press-fit due to deformation. And
Since the adhesive is used, an adhesive action occurs after the press-fitting, and the invasion of moisture and the like is prevented, so that good heat insulating properties can be further maintained. In the present invention, since the heat insulating structure is formed by press-fitting, even if the heat insulating material adheres to the inner and outer shells or the core material after the press-fitting, a uniform contact pressure acts, so that the inner and outer shell surfaces are sticky. There is no such thing. However, as the adhesive force of the adhesive, a strong adhesive force at the time of foam molding is not required.

[0021]

As described above, according to the present invention, according to the first aspect of the present invention, since the heat insulating material is provided with a core material having a predetermined shape, a pressing force is applied when the heat insulating material is pressed into the case. Will be easier. Further, since the core material is covered with a foam having independent air bubbles, the core material can be deformed according to the width of the case at the time of press-fitting, so that the heat insulating material can be press-fitted into the case to form a heat insulating structure.

According to this heat insulating structure, since no foaming step is used in the production stage, defective products due to the foaming pressure and the adhesive force due to foaming are eliminated. Therefore, the product yield is good. It should be noted that a jig for foaming is not required, and this also facilitates production. In addition, since the case receives the uniform pressing force of the heat insulating material, the surface does not become sticky and the quality of the heat insulating structure is improved. Furthermore, since the case and the heat insulating material are in pressure contact with each other, intrusion and condensation of moisture are eliminated, dew condensation is prevented, and good heat insulating performance can be maintained.

In the case where the core material is a vacuum heat insulating material, the vacuum heat insulating material is completely press-fitted into the case as a heat insulating material in a state where its surroundings are securely protected by the foam, so that the vacuum heat insulating material is completely protected without being damaged. Since it is in a state, good heat insulation performance can be maintained. When the core material has air permeability, the heat insulating material has an airtightness as a whole due to the foam having closed cells around the core material, and the heat insulating performance does not deteriorate due to condensation as described above. In addition, since such a heat-insulating structure has almost no adhesive bonding between the case and the heat-insulating material, it is easier to separate the two compared to a conventional heat-insulating structure that has been strongly bonded by foaming, and is easy to handle at the time of product disposal. Is very good.

According to the second aspect of the present invention, in addition to the above, since the heat insulating structure has a pipe disposed between the case and the foam and guided to the outside, this is used as a refrigerant pipe or a pipe for preventing dew condensation. Can be used as a heating tube. in this case,
Since the outside of the heat insulating material forming the heat insulating structure is a foam having closed cells, for example, a pipe is arranged and fixed in a case in advance, and then the heat insulating material is pressed into the heat insulating material to provide a heat insulating material having a pipe. It can be easily manufactured as a structure.

In particular, when the core material is a vacuum heat insulating material,
Since this is not damaged by the piping, the piping work becomes extremely easy and the heat insulation performance can be maintained well.

According to the third aspect of the present invention, in addition to the effect of the first aspect, the foam is coated with an adhesive having lubricity at the time of press-fitting and is press-fitted into the case. The adhesive force of the adhesive acts between the foam and the foam,
The sealing property between the two is improved, and the infiltration of moisture can be prevented, and the continuity of the heat insulating performance can be improved. Further, the press-fitting operation is facilitated by the lubricity of the adhesive at the time of press-fitting.

[Brief description of the drawings]

FIG. 1 shows an example of a heat insulating structure to which the present invention is applied.
(A) is a perspective view of a heat insulating box using the same, and (b) is a cross-sectional view thereof.

FIGS. 2A and 2B show a partial structure of the heat insulating box, wherein FIG. 2A is a cross-sectional view of the inner and outer shells, FIG. It is a perspective view of a body.

3 (a) is a view corresponding to FIG. 1 (b) and is a cross-sectional view showing an example of a heat insulating structure having a pipe, and FIG. 3 (b) is an explanatory view showing an example of a pipe state.

FIG. 4 is an explanatory view showing another manufacturing state of the heat insulating structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Insulation material 3 Refrigeration refrigerant pipe (tube) 21 Core material 22 Foam material (foam)

Claims (3)

[Claims] 1. A heat insulating structure having a heat insulating material in a case, wherein the heat insulating material is formed of a core material having a fixed shape and a foam covering the core material and having independent cells. A heat insulating structure which is press-fitted. 2. The heat insulating structure according to claim 1, further comprising a pipe disposed between the case and the foam and led to the outside. 3. The heat insulating structure according to claim 1, wherein the foam is coated with an adhesive having lubricity at the time of press-fitting and is press-fitted into the case.