JP4183530B2 - Heat insulation box - Google Patents

Heat insulation box Download PDF

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Publication number
JP4183530B2
JP4183530B2 JP2003050588A JP2003050588A JP4183530B2 JP 4183530 B2 JP4183530 B2 JP 4183530B2 JP 2003050588 A JP2003050588 A JP 2003050588A JP 2003050588 A JP2003050588 A JP 2003050588A JP 4183530 B2 JP4183530 B2 JP 4183530B2
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JP
Japan
Prior art keywords
heat insulating
insulating material
box
laminate film
vacuum heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP2003050588A
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Japanese (ja)
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JP2004257684A (en
Inventor
均史 青木
仁 星野
弘道 茂木
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to JP2003050588A priority Critical patent/JP4183530B2/en
Publication of JP2004257684A publication Critical patent/JP2004257684A/en
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  • Thermal Insulation (AREA)
  • Refrigerator Housings (AREA)
  • Laminated Bodies (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、外箱と内箱間の空間に断熱材を設けて成る断熱箱体に関するものである。たとえば、冷凍冷蔵庫に用いられる断熱箱体に関する。
【0002】
【従来の技術】
従来より、冷蔵庫や低温ショーケース等を構成する断熱箱体は、外箱と内箱との間の空間に注入口より断熱材の原液を注入し、発泡充填することにより形成されている。
【0003】
そして、この断熱箱体の断熱性能を高めるために、この断熱箱体の内部に偏平状(平板状)の真空断熱材を配置することが従来から提案実施されている(例えば特許文献1参照)。
【0004】
この真空断熱材は、一般に、ガスバリヤー性を保持させた金属−プラスチックラミネートフィルムから成る外包容器を作成し、この内部にコア材を配置するものである。
【0005】
このような真空断熱材の外包容器としては、アルミニウム箔と熱溶着性プラスチックのラミネートフィルムが一般的である。
【0006】
2枚のラミネートフィルムの周囲部を接合することにより袋状の容器を形成し、この中に無機粉末やグラスファイバ等のコア材を入れて収容した状態で、外包容器内の空気を開口部から真空引きにより排出し、その後、この開口部を熱接合することによって密封される。
【0007】
また、外包容器中には、気体を吸着するゲッター剤が配されている。
【0008】
ところで、アルミニウムは熱伝導率が大きく、このため真空断熱材の周囲のラミネートフィルムを伝って熱が回り込む(所謂ヒートブリッジ)ことが発生してしまう。
【0009】
このため、ラミネートフィルムのアルミニウム箔の代わりにステンレススチール箔を採用することが知られている。ステンレススチール箔のラミネートフィルムは、アルミニウムに比較して非常に高価であるが、熱伝導率及び微細孔に関しては性能が良く、断熱特性が向上する。
【0010】
前述したように、ステンレススチール箔はアルミニウム箔に比較して非常に高価であるため、金属箔の一部を安価なアルミニウム箔とすることが、提案されている(例えば特許文献2、3参照)。
【0011】
【特許文献1】
実開平4−70995号公報
【特許文献2】
特開平8−105687号公報
【特許文献3】
特開平7−98091号公報
【0012】
【発明が解決しようとする課題】
本発明は、真空断熱材の金属箔の一部を安価なアルミニウム箔としても、断熱性能があまり劣化しない断熱箱体を提供することを目的とする。
【0013】
【0014】
【課題を解決するための手段】
本発明は、内箱と金属製外箱の内部に発泡断熱材を充填して製造される断熱箱体において、一方の面がステンレススチール箔を用いたラミネートフィルムで覆われ他方の面がアルミニウム箔を用いたラミネートフィルムで覆われた真空断熱材を、この真空断熱材の前記他方の面を前記外箱の内面に貼り付け、更に、前記真空断熱材の周辺に位置する前記ラミネートフィルムの熱溶着部を前記一方の面側に折り曲げ配置したことを特徴とする。
【0015】
【0016】
本発明は、内箱と金属製外箱の内部に発泡断熱材を充填して製造される断熱箱体において、一方の面が第1のラミネートフィルムで覆われ他方の面が第1のラミネートフィルムより熱伝導率の大きな第2のラミネートフィルムで覆われた真空断熱材を、この真空断熱材の前記他方の面を前記外箱の内面に貼り付け、更に前記真空断熱材の周辺に位置する前記ラミネートフィルムの熱溶着部を前記一方の面側に折り曲げ配置したことを特徴とする。
【0017】
【0018】
【発明の実施の形態】
以下、図面を参照しながら本発明の実施形態を説明する。図1は、平板状の真空断熱材1の断面図を示している。図2は真空断熱材の図である。図3は断熱箱体の断面図である。
【0019】
図1において、2はコア材であり、グラスウール等の無機物質を所定厚みの板状にしたものである。3は、ステンレススチール箔3aを用いた第1のラミネートフィルムである。4は、アルミニウム箔4aを用いた第2のラミネートフィルムである。5は、このラミネートフィルムのヒートシール部である。
【0020】
図2は、真空断熱材1である。この真空断熱材1には、ステンレススチール箔を用いた第1のラミネートフィルム3側の面に油性ペンにより、丸印6が描かれている。この丸印6により作業者は、真空断熱材の裏表(取付面)が一目で判る。
【0021】
図3において、断熱箱体7は家庭用の冷凍冷蔵庫を構成するものである。この断熱箱体7は、鋼板製の外箱8と、この外箱2内に間隔を存して組み込まれたABS樹脂等の硬質合成樹脂製の内箱9と、両箱8、9間に設けられた断熱層10とから構成されている。
【0022】
そして、この断熱層10は、真空断熱材1と発泡断熱材11との二層構造となっている。
【0023】
真空断熱材1は、前記発泡断熱11が充填される以前に、外箱8の内面に両面テープ等にて予め取り付けて置く。
【0024】
発泡断熱材11は、ポリエーテルポリオールとポリイソシアネートを主成分としており、発泡剤としてはシクロペンタンを用いている。
【0025】
発泡断熱材11を充填する際には、外箱8の内面側に真空断熱材1のアルミニウム箔側を取り付け、内箱9を組み込んだものを発泡型(図示せず)にセットする。
【0026】
そして、前記ポリエーテルポリオールをシクロペンタンの発泡剤により希釈してレジンとし、このレジン及び前記ポリイソシアネートの液を所定の割合で混合した原液を高圧発泡機により注入口から外箱8及び内箱9間の空間に吐出する。
【0027】
注入された原液中のポリエーテルポリオールとポリイソシアネートは反応を開始してポリウレタンを生成すると共に、この反応熱によりシクロペンタンがガス化してフォームに封じ込められる。
【0028】
一方、ポリウレタンフォームが膨張して内外箱9、8間の空間内に充満し、真空断熱材1と外箱8の内面、及び、内箱9に接着固化することにより、硬質ポリウレタンフォームの発泡断熱材11が形成される。
【0029】
内箱9の形状は、一般に通常複雑であり、外箱8の内面は内箱9に比して平坦であり、実施例の如く真空断熱材1を外箱8に取り付け、真空断熱材1と内箱9との間に発泡断熱材11を充填すれば、真空断熱材1の取り付け作業が容易となる。
【0030】
なお、真空断熱材1の周辺に位置する前記ラミネートフィルム3、4のヒートシール部5(熱溶着部5)は、ステンレススチール箔を用いたラミネートフィルム3側に折り曲げ配置し、断熱性能を向上させている。
【0031】
このように、本実施形態では、熱伝導率の良いアルミニウム箔側を金属製外箱8側に貼り付けている。つまり、真空断熱材1の外箱に貼り付けられる側は、この外箱が金属製であるために、熱伝導率の小さなラミネートフィルムを用いても、その効果があまり期待できなかった。本実施形態では、そちら側に熱伝導率の高い(断熱性能の悪い)アルミニウム箔を用いたラミネートフィルムを用いることにより、真空断熱材のコストを下げると共に、それによる断熱性能の劣化を抑制することが可能となった。
【0032】
【発明の効果】
以上の如く、請求項1、2によれば、安価で且つ断熱性能の劣化があまりない断熱箱体を提供することができる。
【0033】
請求項2、4によれば、更に断熱性能を向上させることができる。
【図面の簡単な説明】
【図1】 本発明の実施形態である真空断熱材の断面図である。
【図2】 本発明の実施形態である真空断熱材の斜視図である。
【図3】 本発明の実施形態である断熱箱体の断面図である。
【符号の説明】
1 真空断熱材(平板状の真空断熱材)、
3 ラミネートフィルム、
3a ステンレススチール箔、
4 ラミネートフィルム、
4a アルミニウム箔、
5 ヒートシール部(熱溶着部)、
6 油性ペンで描いた丸印(識別手段)、
7 断熱箱体、
8 外箱(金属製外箱)、
9 内箱、
11 発泡断熱材。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat insulating box formed by providing a heat insulating material in a space between an outer box and an inner box. For example, about the heat-insulating main body to be used in the refrigerator.
[0002]
[Prior art]
Conventionally, a heat insulating box constituting a refrigerator, a low-temperature showcase or the like is formed by injecting a stock solution of a heat insulating material into a space between an outer box and an inner box from an inlet and filling with foam.
[0003]
And in order to improve the heat insulation performance of this heat insulation box, it has been proposed to arrange a flat (flat plate) vacuum heat insulating material inside the heat insulation box (see, for example, Patent Document 1). .
[0004]
In general, the vacuum heat insulating material is formed by forming an outer packaging container made of a metal-plastic laminate film having a gas barrier property and placing a core material therein.
[0005]
As an envelope container of such a vacuum heat insulating material, an aluminum foil and a heat-weldable plastic laminate film are generally used.
[0006]
A bag-like container is formed by joining the peripheral parts of two laminated films, and the air in the outer packaging container is passed through the opening in a state in which a core material such as inorganic powder or glass fiber is placed therein. The opening is evacuated and then sealed by thermally bonding the opening.
[0007]
Further, a getter agent that adsorbs gas is disposed in the outer container.
[0008]
By the way, aluminum has a large thermal conductivity, so that heat flows around the laminate film around the vacuum heat insulating material (so-called heat bridge).
[0009]
For this reason, it is known to employ a stainless steel foil instead of the aluminum foil of the laminate film. A laminated film of stainless steel foil is very expensive compared to aluminum, but has good performance and improved thermal insulation properties with respect to thermal conductivity and micropores.
[0010]
As described above, since stainless steel foil is very expensive compared to aluminum foil, it has been proposed that a part of the metal foil be an inexpensive aluminum foil (see, for example, Patent Documents 2 and 3). .
[0011]
[Patent Document 1]
Japanese Utility Model Publication No. Hei 4-70995 [Patent Document 2]
JP-A-8-105687 [Patent Document 3]
JP-A-7-98091
[Problems to be solved by the invention]
An object of this invention is to provide the heat insulation box which a heat insulation performance does not deteriorate so much even if it uses cheap aluminum foil for some metal foils of a vacuum heat insulating material.
[0013]
[0014]
[Means for Solving the Problems]
The present invention relates to a heat insulating box manufactured by filling a foam heat insulating material in an inner box and a metal outer box, and one surface is covered with a laminate film using a stainless steel foil, and the other surface is an aluminum foil. A vacuum heat insulating material covered with a laminate film using the vacuum heat insulating material, the other surface of the vacuum heat insulating material is attached to the inner surface of the outer box, and the laminate film located on the periphery of the vacuum heat insulating material is thermally welded. The portion is bent and arranged on the one surface side.
[0015]
[0016]
The present invention relates to a heat insulating box manufactured by filling a foam heat insulating material in an inner box and a metal outer box, and one surface is covered with a first laminate film and the other surface is a first laminate film. more thermal conductivity larger second vacuum heat insulating material covered with a laminate film of, pasted to the other side of the vacuum heat insulating material on the inner surface of the outer box, located further around the vacuum insulating material The heat-welded portion of the laminate film is bent and arranged on the one surface side.
[0017]
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of a flat vacuum heat insulating material 1. FIG. 2 is a diagram of a vacuum heat insulating material. FIG. 3 is a cross-sectional view of the heat insulating box.
[0019]
In FIG. 1, reference numeral 2 denotes a core material, which is an inorganic substance such as glass wool formed into a plate shape having a predetermined thickness. Reference numeral 3 denotes a first laminate film using the stainless steel foil 3a. Reference numeral 4 denotes a second laminate film using the aluminum foil 4a. Reference numeral 5 denotes a heat seal portion of the laminate film.
[0020]
FIG. 2 shows the vacuum heat insulating material 1. In this vacuum heat insulating material 1, a circle 6 is drawn with an oil-based pen on the surface of the first laminate film 3 using a stainless steel foil. With this circle 6, the operator can recognize the back and front (mounting surfaces) of the vacuum heat insulating material at a glance.
[0021]
In FIG. 3, the heat insulation box 7 constitutes a domestic refrigerator-freezer. The heat insulating box 7 includes a steel plate outer box 8, an inner box 9 made of a hard synthetic resin such as ABS resin, which is incorporated in the outer box 2 with a space therebetween, and both boxes 8, 9. The heat insulating layer 10 is provided.
[0022]
The heat insulating layer 10 has a two-layer structure of the vacuum heat insulating material 1 and the foam heat insulating material 11.
[0023]
The vacuum heat insulating material 1 is previously attached to the inner surface of the outer box 8 with a double-sided tape or the like before the foam heat insulating material 11 is filled.
[0024]
The foam heat insulating material 11 is mainly composed of polyether polyol and polyisocyanate, and cyclopentane is used as a foaming agent.
[0025]
When filling the foam heat insulating material 11, the aluminum foil side of the vacuum heat insulating material 1 is attached to the inner surface side of the outer box 8, and the one incorporating the inner box 9 is set in a foaming mold (not shown).
[0026]
Then, the polyether polyol is diluted with a cyclopentane foaming agent to form a resin, and a stock solution obtained by mixing the resin and the polyisocyanate liquid at a predetermined ratio is injected from the injection port to the outer box 8 and the inner box 9 by a high-pressure foaming machine. Discharge into the space between.
[0027]
The polyether polyol and polyisocyanate in the injected stock solution start to react to form polyurethane, and cyclopentane is gasified by the heat of reaction and enclosed in the foam.
[0028]
On the other hand, the polyurethane foam expands and fills the space between the inner and outer boxes 9 and 8, and is bonded and solidified to the inner surface of the vacuum heat insulating material 1 and the outer box 8 and to the inner box 9. A material 11 is formed.
[0029]
The shape of the inner box 9 is generally complicated, and the inner surface of the outer box 8 is flat compared to the inner box 9, and the vacuum heat insulating material 1 is attached to the outer box 8 as in the embodiment. If the foam heat insulating material 11 is filled with the inner box 9, the vacuum heat insulating material 1 can be easily attached.
[0030]
In addition, the heat seal part 5 (thermal welding part 5) of the said laminate films 3 and 4 located in the periphery of the vacuum heat insulating material 1 is bent and arrange | positioned at the side of the laminate film 3 using stainless steel foil, and heat insulation performance is improved. ing.
[0031]
Thus, in this embodiment, the aluminum foil side with good thermal conductivity is stuck on the metal outer box 8 side. That is, on the side of the vacuum heat insulating material 1 attached to the outer box, since the outer box is made of metal, the effect could not be expected so much even if a laminate film having a low thermal conductivity was used. In this embodiment, by using a laminate film using an aluminum foil with high thermal conductivity (poor heat insulation performance) on that side, the cost of the vacuum heat insulating material is reduced and the deterioration of the heat insulation performance caused thereby is suppressed. Became possible.
[0032]
【The invention's effect】
As described above , according to claims 1 and 2, it is possible to provide a heat insulation box that is inexpensive and does not have much deterioration in heat insulation performance.
[0033]
According to the second and fourth aspects, the heat insulation performance can be further improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a vacuum heat insulating material according to an embodiment of the present invention.
FIG. 2 is a perspective view of a vacuum heat insulating material according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a heat insulating box which is an embodiment of the present invention.
[Explanation of symbols]
1 vacuum insulation (flat vacuum insulation),
3 Laminate film,
3a stainless steel foil,
4 Laminated film,
4a aluminum foil,
5 Heat seal part (thermal welding part),
6 Circles (identification means) drawn with an oil pen,
7 Insulated box,
8 outer box (metal outer box),
9 Inner box,
11 Foam insulation.

Claims (2)

内箱(9)と金属製外箱(8)の内部に発泡断熱材(11)を充填して製造される断熱箱体(7)において、
一方の面がステンレススチール箔(3a)を用いたラミネートフィルム(3)で覆われ他方の面がアルミニウム箔(4a)を用いたラミネートフィルム(4)で覆われた真空断熱材(1)を、この真空断熱材(1)の前記他方の面を前記外箱(8)の内面に貼り付けるように配置し
前記真空断熱材(1)の周辺に位置する前記ラミネートフィルムの熱溶着部(5)を前記一方の面側に折り曲げ配置したことを特徴とする断熱箱体。
In the heat insulation box (7) manufactured by filling the inner box (9) and the metal outer box (8) with the foam heat insulating material (11),
A vacuum heat insulating material (1) having one surface covered with a laminate film (3) using a stainless steel foil (3a) and the other surface covered with a laminate film (4) using an aluminum foil (4a), The other surface of the vacuum heat insulating material (1) is disposed so as to be attached to the inner surface of the outer box (8) ,
The heat insulation box characterized by arrange | positioning the heat welding part (5) of the said laminate film located in the periphery of the said vacuum heat insulating material (1) by bending to the said one surface side.
内箱(9)と金属製外箱(8)の内部に発泡断熱材(11)を充填して製造される断熱箱体(7)において、
一方の面が第1のラミネートフィルム(3)で覆われ他方の面が第1のラミネートフィルム(3)より熱伝導率の大きな第2のラミネートフィルム(4)で覆われた真空断熱材(1)を、この真空断熱材(1)の前記他方の面を前記外箱(8)の内面に貼り付けるように配置し
前記真空断熱材(1)の周辺に位置する前記ラミネートフィルムの熱溶着部(5)を前記一方の面側に折り曲げ配置したことを特徴とする断熱箱体。
In the heat insulation box (7) manufactured by filling the inner box (9) and the metal outer box (8) with the foam heat insulating material (11),
A vacuum heat insulating material (1) having one surface covered with a first laminate film (3) and the other surface covered with a second laminate film (4) having a higher thermal conductivity than the first laminate film (3). ) Is disposed so that the other surface of the vacuum heat insulating material (1) is attached to the inner surface of the outer box (8) ,
The heat insulation box characterized by arrange | positioning the heat welding part (5) of the said laminate film located in the periphery of the said vacuum heat insulating material (1) by bending to the said one surface side .
JP2003050588A 2003-02-27 2003-02-27 Heat insulation box Expired - Lifetime JP4183530B2 (en)

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JP4183530B2 true JP4183530B2 (en) 2008-11-19

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JP3513123B2 (en) * 2001-07-12 2004-03-31 松下冷機株式会社 Refrigerator manufacturing method

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