JP3876551B2 - Insulation and refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat insulating body in which, for example, a vacuum heat insulating panel is disposed as a heat insulating material in a gap formed by a thin metal plate or a resin molded product on a wall surface that requires heat insulation, such as a refrigerator. It is related with arrangement | positioning to the refrigerator outer shell of a panel.
[0002]
[Prior art]
Conventionally, the wall surface of a heat insulator used in a refrigerator or the like is formed by covering the outer surface with a thin metal plate such as an iron plate and forming the inner surface portion with a resin molded product, and injecting and filling urethane foam into the gap. Has been.
Hydrochlorofluorocarbons 1,1-dichloro-1-fluoroethane (HCFC141b) has been used as a foaming agent for foamed urethane, which is a heat insulating material. It has been proposed to use hydrofluorocarbons and hydrocarbons that are not contained therein.
[0003]
For example, JP-A-2-235882 discloses hydrofluorocarbons such as 1, 1, 1, 3, 3-pentafluoropropane (HFC245fa) and 1, 1, 1, 4, 4, 4-hexafluorobutane (HFC356mffm). For example, Japanese Patent Laid-Open No. 3-152160 discloses a method for producing foamed urethane in which a hydrocarbon such as cyclopentane is applied as a foaming agent. However, the heat insulating properties of these urethane foams are 19-20 mw / MK, which is clearly inferior to the heat insulating properties of 16 mw / MK when using chlorofluorocarbons used before the regulation of ozone-depleting substances. .
[0004]
For this reason, the technique which applies the vacuum heat insulation panel which can obtain the heat insulation of 5-10mw / MK which is the heat insulation performance more than twice of the conventional urethane foam is proposed. The core material of such a vacuum heat insulation panel has a strength equal to or higher than atmospheric pressure, and it is necessary to suppress the amount of heat conduction and radiant heat transfer. Therefore, the core material is a substance having a small heat transfer amount. It is effective to use a plate made of a porous material. For example, in Japanese Patent Application Laid-Open No. 60-205164, open-cell foamed urethane is used.
[0005]
In addition, regarding the disposition to the heat insulator, Japanese Patent Application Laid-Open No. 60-60483 discloses a foamed urethane foam for attaching a vacuum heat insulating panel to the surface of the inner box that is the interior material of the refrigerator or the outer box that is the outer material. There has been proposed a method of providing and arranging a passage through which the injected liquid flows and diffuses. Furthermore, Japanese Patent Application Laid-Open No. 61-195259 proposes a method of creating a vacuum heat insulation panel having one surface formed in accordance with the shape of the inner box of the refrigerator, and disposing the vacuum heat insulation panel at an appropriate position of the inner box shape. .
[0006]
[Problems to be solved by the invention]
On the other hand, as the heat transfer component of the vacuum heat insulation panel, the heat transferred to the gas is eliminated by eliminating the gas in the pores from the heat transfer component of the porous body, and transferred by the heat and radiation transmitted through the resin. Since only heat is used, it is known that the vacuum insulation panel exhibits excellent heat insulation performance. Therefore, a vacuum heat insulation panel wrapped with a laminated sheet or the like provided with an aluminum foil is fixed by, for example, bonding to an outer box made of a thin steel plate, which is a common refrigerator arrangement method, and is made of a resin molded product. In the structure in which urethane foam is filled in the gap with the box, it is necessary to consider the heat insulation performance in consideration of the heat diffusion transmitted through the packaging material.
[0007]
For example, in Japanese Patent Application Laid-Open No. 59-146993, for the purpose of suppressing the influence of heat transfer on the aluminum foil provided in the inner layer portion in order to ensure the gas barrier property of the packaging material, A proposal has been made to limit the thickness to a specific thickness by preventing the deterioration of the gas barrier property by not including defects such as holes, and using the thinnest aluminum foil.
However, the heat received by the exterior material is transferred to the vacuum insulation panel packaging material, and the heat transferred to one side of the vacuum insulation panel is transferred to the other side through the side surface of the packaging material containing the aluminum foil. To do. Therefore, the presence of the aluminum foil having a heat conductivity of 10 4 times that of the vacuum heat insulation panel has a considerable influence on the heat insulation performance of the vacuum heat insulation panel.
[0008]
For this reason, Japanese Utility Model Laid-Open No. 62-143184 proposes an invention in which the metal foil layer constituting the envelope of the vacuum heat insulating material is partially removed for the purpose of preventing heat transfer. However, since the vacuum insulation material obtained in this way has only a part of the resin film from which the aluminum foil has been partially removed, even if the influence on the insulation performance by the packaging material is reduced, the part of the resin film only Intrusion of gas from outside cannot be prevented, and as a result, the heat insulation performance is deteriorated due to the decrease in the degree of vacuum.
[0009]
The present invention has been made to solve the above problems, and a packaging material having relatively good heat conduction of a vacuum heat insulating panel in which the heat of the outer box surface is bonded to the inner side of the outer box in a heat insulating box such as a refrigerator. In addition to preventing the deterioration of the heat insulation performance of the vacuum heat insulation panel caused by conducting this packaging material, it is possible to obtain a heat insulator with excellent heat insulation efficiency and to improve the heat insulation performance associated with a decrease in the degree of vacuum over time. It aims at obtaining the heat insulating body which can also prevent deterioration.
[0010]
[Means for Solving the Problems]
A heat insulating body according to the present invention is a heat insulating body in which a vacuum heat insulating panel is disposed in a void in an outer shell formed of a wall material, and a porous heat insulating material is filled in the remaining space, and a plurality of the wall materials are provided. The vacuum heat insulation panel is disposed in contact with the wall material through a plurality of bottom points on the inner surface of the wall material corresponding to the recess.
[0012]
Moreover, the said wall material and the said vacuum heat insulation panel contact | connect through the adhesive agent with heat insulation, or the adhesive agent of a porous substance .
[0015]
Furthermore, the refrigerator of this invention is a refrigerator provided with the heat insulating body in any one of the above.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a partial cross-sectional view showing an example of a heat insulator 6 according to the first aspect of the present invention. The heat insulating body 6 has an outer shell composed of an outer wall material 1 made of a thin metal plate and an inner wall material 2 made of a resin molded product, and a vacuum heat insulating panel 3 is disposed in the inner shell, The space is filled with a porous heat insulating material 4.
The surface of the vacuum heat insulation panel 3 is provided with a convex portion 5a by forming a concave / convex surface having a level difference of about 5 to 15 mm, for example, and the vacuum heat insulation panel 3 is disposed in contact with the outer wall material 1. . 4 is a porous heat insulating material such as urethane foam, which is a space formed by the outer wall material 1 and the convex portion 5a of the vacuum heat insulating panel 3, and a space formed between the inner wall material 2 and the vacuum heat insulating panel 3. Both sides are filled, and a heat insulator is formed by bonding each of them.
[0017]
The vacuum heat insulation panel 3 includes a core layer 7 and a film layer 8 having a gas barrier property such as an aluminum foil covering the core material 7 as shown in the cross-sectional view shown in FIG. Moreover, the convex part 5a of the vacuum heat insulation panel 3 surface is formed by forming the uneven surface with a fixed directionality in the core material 7. FIG.
FIG. 3 shows a filling process of the porous heat insulating material 4 when the heat insulating body 6 is manufactured. Although the shape and number of the convex portions 5a provided on the vacuum heat insulating panel 3 may be determined as appropriate, the convex portions extending in the direction parallel to the filling direction of the porous heat insulating material 4 are formed on the vacuum heat insulating panel 3 as shown in FIG. Providing a plurality is advantageous because the porous heat insulating material 4 can be easily filled into a space portion having a level difference of 5 to 15 mm formed by the convex portion 5a and the wall material. In FIG. 3, 11 indicates an inlet for the porous heat insulating material 4, and an arrow indicates the flow of the porous heat insulating material 4.
[0018]
In this way, the entire surface of one side of the film layer 8 constituting the vacuum heat insulation panel 3 is in contact with the outer wall material 1 by making the structure in contact with the outer wall material 1 only at the convex portion 5a portion of the vacuum heat insulation panel 3. On the other hand, the contact area is reduced, and as a result, the amount of heat transferred to the vacuum heat insulation panel 3 is reduced, and a heat insulator excellent in heat insulation performance with improved heat passage rate of 3 to 5% can be obtained. Moreover, since the whole core material 7 including the convex part 5a is covered with the film layer 8, the gas intrusion into the vacuum heat insulation panel over time can be prevented, and the thermal conductivity accompanying the increase in the degree of vacuum over time can be prevented. There will be no deterioration.
[0019]
In the first embodiment, the vacuum heat insulating panel 3 is arranged so that the convex portion 5a is in contact with the outer wall material 1. However, as shown in FIG. The same effect can be obtained even if it is arranged so as to be in contact with.
[0020]
Embodiment 2. FIG.
FIG. 5 is a partial cross-sectional view showing an example of the heat insulator 6 according to the second aspect of the present invention. Here, the metal thin plate of the outer wall material 1 constituting the outer shell is processed into a corrugated shape having a level difference of about 5 to 15 mm, and a plurality of concave portions 5 b are formed in the outer wall material 1. The vacuum heat insulation panel 3 is disposed in contact with the bottom of the recess 5b.
[0021]
By doing in this way, since the contact area of the outer wall material 1 and the vacuum heat insulation panel 3 becomes small similarly to Embodiment 1, the heat insulator with good heat insulation performance can be obtained.
[0022]
In the second embodiment, the corrugation is formed in the outer wall material 1 and the recess 5b is provided. However, as shown in FIG. 6, the corrugation is formed in the inner wall material 2 constituting the outer shell and the recess 5c is formed. The same effect can be obtained even if the vacuum insulation panel 3 is provided and positioned in the recess 5c.
Further, the shape and number of the recesses 5b and 5c may be determined as appropriate, but when the corrugations are provided on the wall materials 1 and 2 so that the extending direction of the recesses 5b and 5c is parallel to the filling direction of the porous heat insulating material 4, Advantageously, the filling of the porous insulation 4 is not hindered by these recesses.
[0023]
Embodiment 3 FIG.
FIG. 7 is a partial cross-sectional view showing an example of the heat insulator 6 according to the third aspect of the present invention. Here, 9 is an adhesive having heat insulation properties, for example, an adhesive of porous resin. In the first embodiment, the vacuum heat insulating panel 3 is arranged in such a manner that the convex portion 5 a provided on the surface thereof is in direct contact with the outer wall material 1, but here, the outer wall material is interposed therethrough with an adhesive 9. 1 and the convex part 5a vertex are bonded indirectly, and the outer wall material 1 and the vacuum heat insulation panel 3 are fixed. As a result, the heat insulating body 6 having further improved heat insulating performance than that of the first embodiment is obtained.
[0024]
In addition, as shown in FIG. 8, the inner wall material 2 is indirectly bonded between the inner wall material 2 constituting the outer shell and the vertex of the convex portion 5a of the vacuum heat insulating panel 3 through an adhesive 9 having heat insulation properties. And the vacuum heat insulating panel 3 are fixed, the heat insulating body 6 having improved heat insulating performance is obtained.
[0025]
Embodiment 4 FIG.
FIG. 9 is a partial cross-sectional view showing an example of the heat insulator 6 according to the fourth aspect of the present invention. Here, 9 is an adhesive having heat insulation properties, for example, an adhesive of porous resin. In the previous second embodiment, the vacuum heat insulating panel 3 is disposed so as to be in direct contact with the concave portion 5b obtained by forming the outer wall material 1 constituting the outer shell into a wave shape. The bottom of the recess 5b and the vacuum heat insulating panel 3 are indirectly bonded to each other through the heat insulating adhesive 9, and the outer wall material 1 and the vacuum heat insulating panel 3 are fixed. As a result, the heat insulating body 6 having further improved heat insulating performance than that of the second embodiment is obtained.
[0026]
As shown in FIG. 10, the inner wall material 2 constituting the outer shell is formed in a wave shape to provide a recess 5 c, and the bottom of the recess 5 c and the vacuum heat insulation panel 3 are provided via an adhesive 9 having heat insulation properties. Even if the inner wall material 2 and the vacuum heat insulating panel 3 are fixed indirectly, the heat insulating body 6 having improved heat insulating performance is obtained.
[0027]
Embodiment 5 FIG.
FIG. 11 is a cross-sectional view showing an example of a heat insulating body 6 according to the fifth aspect of the present invention, and FIG. 12 shows a vacuum heat insulating panel 3 used for the heat insulating body 6.
Here, the vacuum heat insulating panel 6 is constituted by a core material 7 finished as a rough surface so as to have irregularities on the surface and a film layer 8 covering the core material 7, and is covered with the film layer 8 because of its surface roughness. The surface of the vacuum heat insulation panel 3 has a large number of convex portions 5d having a height of about 0 to 2 mm, for example. The vacuum heat insulating panel 3 configured in this manner is brought into contact with the outer wall material 1 and the inner wall material 2 to form a large number of air layers 10 between these convex portions 5d, and then the inner wall material 2 or the outer wall material 1 and By filling the space with the vacuum heat insulating panel 3 with the porous heat insulating material 4, the contact area with the outer wall material 1 and the inner wall material 2 constituting the heat insulating wall can be reduced to obtain a heat insulating material with excellent heat insulating performance. it can.
[0028]
In each of the above embodiments, an example in which either the outer wall material 1 or the inner wall material 2 and the vacuum heat insulating panel 3 are in contact with each other has been described. However, in the present invention, both the outer wall material 1 and the inner wall material 2 and the vacuum heat insulating panel 3 are described. Including the case of contact with.
[0029]
【The invention's effect】
As described above, according to the present invention, since the vacuum heat insulating panel is arranged in contact with the wall material with the convex portion formed on the surface thereof, the contact area between the wall material and the vacuum heat insulating panel is reduced, and the vacuum heat insulation from the wall material. An effect of blocking direct heat conduction to the packaging material having the highest thermal conductivity among the components of the panel can be obtained. Therefore, the amount of heat transmitted from the heat receiving surface (for example, the outer wall material) to the opposite surface (for example, the inner wall material) is reduced, and the heat insulating performance of the heat insulating body is improved.
[0030]
In addition, since the vacuum insulation panel is placed in contact with a recess formed in the wall material, the contact area between the wall material and the vacuum insulation panel is reduced, and the amount of heat transmitted through the surface of the packaging material of the vacuum insulation panel Is reduced, and the heat insulation performance of the heat insulator is improved. In this case, since the shape of the vacuum heat insulation panel can be simplified, there is an advantage that a vacuum heat insulation panel that is easy to manufacture and inexpensive can be used.
[0031]
In addition, the wall material and the vacuum heat insulation panel are partially brought into contact with each other through an adhesive layer made of resin or the like, so that further heat transfer can be suppressed and the heat insulation performance of the heat insulator is greatly improved.
[0032]
In addition, since the convex portion is provided on the surface of the vacuum thermal insulation panel by forming the convex portion on the core material constituting the vacuum thermal insulation panel, compared to the case where the convex portion is formed by separately providing other elements and parts. The stability of the installation is excellent and the manufacture becomes easy.
[0033]
Furthermore, since the surface of the vacuum insulation panel is provided with a rough surface by finishing the surface of the core material constituting the vacuum insulation panel, a large number of relatively small projections with sharp edges are obtained. Since the contact area with the vacuum heat insulation panel can be reduced efficiently, a heat insulator with excellent heat insulation performance can be obtained.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a heat insulator showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing an example of a vacuum heat insulation panel used in the present invention.
FIG. 3 is a perspective view for explaining a filling process of a porous heat insulating material at the time of manufacturing the heat insulating body of the present invention.
FIG. 4 is a partial cross-sectional view of a heat insulator showing another example of the first mode.
FIG. 5 is a partial cross-sectional view of a heat insulator showing a second embodiment of the present invention.
FIG. 6 is a partial cross-sectional view of a heat insulator showing another example of the second mode.
FIG. 7 is a partial cross-sectional view of a heat insulator showing a third embodiment of the present invention.
FIG. 8 is a partial cross-sectional view of a heat insulator showing another example of the third mode.
FIG. 9 is a partial cross-sectional view of a heat insulator showing a fourth embodiment of the present invention.
FIG. 10 is a partial cross-sectional view of a heat insulator showing another example of the fourth aspect.
FIG. 11 is a partial sectional view of a heat insulator showing a fifth embodiment of the present invention.
FIG. 12 is a cross-sectional view showing another example of the vacuum heat insulating panel used in the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer wall material, 2 Inner wall material, 3 Vacuum heat insulation panel, 4 Porous heat insulation material, 5a Convex part of vacuum heat insulation panel, 5b Concave part of outer wall material, 5c Concave part of inner wall material, 5d Convex part of vacuum heat insulation panel, 6 Thermal insulator 7 core material, 8 film layer, 9 adhesive, 10 air layer.

Claims (4)

In a heat insulating body in which a vacuum heat insulation panel is disposed in a void in an outer shell formed by a wall material, and a porous heat insulating material is filled in the remaining void,
A plurality of concave portions are formed in the wall material, and the vacuum heat insulating panel is disposed in contact with the wall material through a plurality of bottom points on the inner surface of the wall material corresponding to the concave portions. . The heat insulator according to claim 1, wherein the wall material and the vacuum heat insulating panel are in contact with each other through a heat insulating adhesive. The heat insulating body according to claim 1, wherein the wall material and the vacuum heat insulating panel are in contact with each other through an adhesive of a porous material. The refrigerator provided with the heat insulating body in any one of Claims 1-3.

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