JP3957563B2

JP3957563B2 - Insulated box and method for manufacturing the same

Info

Publication number: JP3957563B2
Application number: JP2002153249A
Authority: JP
Inventors: 博士宮村; 英一甲斐
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2002-05-28
Filing date: 2002-05-28
Publication date: 2007-08-15
Anticipated expiration: 2022-05-28
Also published as: JP2003343972A

Description

【０００１】
【発明の属する技術分野】
本発明は、冷蔵庫等に使用する断熱箱体およびその製造方法に関するものである。
【０００２】
【従来の技術】
従来の冷蔵庫の断熱箱体では、図１１に示すように、天板３と左右側板２、４とが一体に成形されたユニット体、内箱１１、表板６、底板５、裏板７及び補強用アングル９を組み合わせ後、横に倒した状態で発泡冶具１３に収め、冶具上蓋１３ａを閉じた後、断熱箱体の裏板７に開けられた注入口２１より断熱材注入ヘッド１７を挿入し、箱体の空間内に発泡断熱材の原液を注入し、発泡硬化させる。
【０００３】
そのとき、箱体は発泡するときの圧力に対処するため、図１２に示すように、圧力のかかる全ての面は発泡冶具１３で保持される。
【０００４】
発泡断熱材を使用して断熱箱体を製造する場合、発泡時の内部圧力は非常に大きなものとなる。そのため、発泡冶具１３の強度はもちろん、箱体を構成する各部品の接合部においても断熱材の漏出などが常に問題となっている。このような状況の中で、発泡断熱材の原液を注入する注入口２１の処理が一つの課題となっている。
【０００５】
図１３は、図１１においてＡの方向から見た矢視図である。現状では、図のように、冷蔵庫の背面となる裏板７に開けられた注入口２１の内側に、スチールペーパー等の弾性体からなる注入口カバー２２をあらかじめ粘着テープ２６で貼着している。この状態で、図１４のように、断熱材注入ヘッド１７を注入口２１内に挿入し、断熱材原液を注入後、注入ヘッド１０を抜くと、注入口カバー２２が弾性力で元に戻ることにより注入口２１を封鎖し、内部からの断熱材の漏出を防止している。
【０００６】
【発明が解決しようとする課題】
しかし注入口２１の封鎖を注入口カバー２２の弾性力に頼るため、完全に注入口を封鎖することが困難で、図１４の矢印Ｂのように洩れが発生することがある。このような時は断熱材の洩れが少量の場合でも周辺部の修正に時間がかかる。また、良好な断熱特性を得るためには、発泡が完了するまで十分な圧力を保持しておく必要があるが、大量に漏れた場合は内部の圧力が十分上がらないため、断熱特性が低下することになる。
【０００７】
この注入口２１の位置の設定については、設計の時点で決定されているが、発泡製造設備、発泡冶具構造、断熱箱体構造等の制約により、安定した発泡充填状態を得ることができる位置に形成する事は非常に難しく、製造時において発泡断熱材の過充填や、裏板７、底板５及び内箱１１等に複数個のガス抜き穴（図示せず）を追加形成したりして対応している。
【０００８】
また、注入口２１を固定すると、図１５に示すように、外箱１に注入された発泡断熱材１８の原液は、落下位置Ｒに「山なり」にたまる傾向がある。注入された発泡断熱材１８の原液は、発泡を開始して外箱内の空間に広がっていくが、注入口２１の設定位置によっては、「山なり」に溜まっているために、均一な発泡が行われず、発泡断熱材密度の不均一、気泡の乱れ、ガスボイド等が生じる。
【０００９】
また、注入口２１の位置の変更が必要とされる場合も発生する。その場合、金型や発泡冶具の変更など多大の費用と労力がかかるという問題があった。また、最近では冷蔵庫の大型化に伴い、断熱箱体への注入口の形設を２箇所から４箇所に増やす傾向にあり、より一層、大きな改善課題となっている。
【００１０】
また、図１６のように、裏板７と底板５との接合部は、軟質ウレタンフォームなどのシール用クッション材２３を用いて断熱材の漏出を防止しているが、裏板７と底板５とが適切に組み合わされてはじめて効果が得られるという不安定な状態である。
【００１１】
さらに、底板５には図１２に示すように、内部からの配線材２４や配管２５を引き出すための切り欠き１６(図１１)があるため、その部分でクッション材２３が折れ曲がったりするなど、必要とする組合せ形状(断熱材シールライン)を保つことが難しく、断熱材の漏出が発生する（図１６の矢印Ｇ）。
【００１２】
本発明は、裏板に注入口を形成することなく、簡単な構造で断熱材の洩れがなく、外観性に優れ、また、発泡断熱材が均一に充填可能で断熱特性の優れた断熱箱体を製造することを目的とする。
【００１３】
【課題を解決するための手段】
上記目的を達成するため、左右側板、天板、底板、表板および裏板とで構成された外箱と、内箱との間の空間に発泡断熱材原液を注入発泡させた断熱箱体を製造するときに、外箱を構成する少なくとも一方の板を開閉可能な開閉板とし、開閉板を開けた状態で外箱内に発泡断熱材原液を注入し、その後、開閉板を閉じて発泡断熱材原液を発泡させるようにしたことを特徴とするものである。
【００１４】
すなわち、本発明においては、外箱を完全に組立てて、裏板に形成した注入口から断熱材原液を注入するのではなく、開閉板を開けた状態の外箱内に発泡断熱材原液を注入するようにした。したがって、構造が簡単で、発泡断熱材原液を注入する注入ヘッドの可動範囲が大きく、外箱と内箱との間の空間に注入される発泡断熱材原液の分布を均一にすることができるため、ムラのない適正な発泡により断熱材の断熱性能の均一化が可能となる。
【００１５】
また、上記断熱箱体は、注入口を廃止したため、従来のように注入口から発泡断熱材が漏出するおそれがなく、また、外箱のすべての面は発泡治具で密着するように被われるため、開閉板の周囲から断熱材が漏出するのを防止することができる。
【００１６】
発泡断熱材原液の注入は、外箱から開閉板の一方を持ち上げた状態で行ってもよいし、外箱から開閉板を取り外した状態で行ってもよい。開閉板としては、左右側板、天板、底板、表板および裏板のうちの少なくとも一の板とすればよいが、特に裏板を開閉板とすると、面積が広く、発泡断熱材原液を空間に均一に分布させることが可能となる点で好ましい。
【００１７】
また、従来の断熱箱体においては、強度面及び外観面等の観点から、外箱を構成する左右側板と天板とが一体的に形成されたものが一般的に用いられている。このような構成の断熱箱体においては、裏板を開閉板とした場合に裏板を外した状態では、天板側は強度が強いものの底板側は強度が低く、左右側板間の間隔が保持できずに、発泡断熱材原液を注入後、裏板を閉じるのが困難になるおそれが生じる。
【００１８】
そこで、本発明においては、外箱として左右側板及び天板が一体的に形成されたものを使用する場合、左右側板間に両側板間の間隔を保持するための補強部材を設け、左右側板、天板、補強部材、底板、表板及び内箱を組立てた後、裏板を開けた状態で、外箱内に発泡断熱材原液を注入し、その後、裏板を閉じて発泡断熱材原液を発泡させる方法を採用可能とした。このようにして得られた断熱箱体は、左右側板及び天板が一体的に形成され、左右側板間に両側板間の間隔を保持するための補強部材が設けられたことを特徴とするものである。
【００１９】
上記構成によれば、裏板をスムーズかつ確実に閉じることができ、断熱材原液の漏出を防止することが可能となる。
【００２０】
左右側板及び天板が一体的に形成されたものとは、１枚の板を折曲して左右側板及び天板を形成したものは勿論のこと、左右側板及び天板を別部材として形成し、これらをボルト・ナット等の適当な固着手段を用いて一体化したものをも含む意味である。
【００２１】
補強部材を設ける位置については、左右側板間の間隔を保持可能な位置であれば特に制限はないが、底板に当接するように左右側板間に架設すれば、側板間の間隔を保持可能であるのみならず、底板を適正な位置で固定可能となるため、裏板をより確実に閉じることが可能となる。
【００２２】
この場合、補強部材は、底板の端部に当接させるようにするのが好ましい。すなわち、底板は、裏板側の端部（以下、「底板端部」と略する）において、その一部又は全部を折曲して先端側を裏板に対向するように形成され、底板端部の外側が裏板に当接して発泡断熱材の漏出を防ぐ構造とされている。
【００２３】
したがって、補強部材を底板端部の内側に当接するように配すれば、裏板が開いた状態にもかかわらず、シールラインとなる底板端部の強度を高めてシール性を向上させることができ、発泡断熱材の漏出を防止することが可能となる。
【００２４】
補強部材は、底板端部から裏板にかけて形成し、かつ裏板に当接する形状とすれば、補強部材が裏板と底板の隙間に対するシール材として機能するため、発泡断熱材の漏出をより効果的に防止することが可能となる。
【００２５】
また、底板端部は、前述のように折曲されて立体的に形成されているため、補強部材を底板端部に沿うような立体的な形状とすれば、補強部材の強度をより高めることができ、底板を確実に固定可能であるとともに、シール性をさらに向上させることが可能となる。
【００２６】
また、本発明においては、裏板の周縁を折曲して折曲部が形成され、前記左右側板又は天板に折曲部を嵌合可能とするフランジ部が形成されるとともに、前記折曲部をフランジ部に案内するためのガイドが設けられた構成を採用可能とし、これにより、折曲部をスムーズにフランジ部に嵌合することが可能となる。折曲部は、裏板の周縁を折曲して形成するほかに、適当な幅の板を裏板に接合して形成してもよい。
【００２７】
ガイドとしては、閉じた状態の裏板の底板側を持ち上げて発泡断熱材原液を注入する場合には、左右側板のフランジ部に嵌合する折曲部（左右側板側の折曲部という）の高さを、底板側よりも天板側を高く形成し、これをガイドとして使用することができる。
【００２８】
この場合には、天板側の折曲部が高く形成されているため、裏板の底板側を持ち上げた状態においても、左右側板側の折曲部は、広い範囲にわたってフランジ部に嵌合した状態となり、折曲部とフランジ部との位置ずれが生じにくく、スムーズに裏板を閉じることが可能となる。
【００２９】
【発明の実施の形態】
以下、図面を基に本発明に係る断熱箱体及びその製造方法について説明する。なお、図中、従来技術と同一の部品については同一の符号を付している。
【００３０】
［第１の実施形態］
本発明の第１の実施形態を図１〜７に示す。図１は裏板を外した状態の外箱の斜視図を、図２は外箱を発泡治具に収容した状態を示す斜視図を、図３は補強部材の断面図を夫々示す。
【００３１】
本発明における外箱１は、右側板２、天板３、左側板４、底板５、表板６および裏板７とで構成されており、右側板２、天板３、左側板４、底板５及び表板６を組立てた状態で、裏板７が開閉自在な構造とされている。
【００３２】
右側板２、天板３及び左側板４は、１枚の板を折曲して一体的に形成されており、右側板２及び左側板４の下部には、補強用アングル９が取付けられている。補強用アングル９は、左右側板２、４の底板側端縁から、裏板側端縁に沿うようなＬ字形とされている。
【００３３】
左右一対の補強用アングル９、９の間には、補強部材１０がかけわたされて固定されており、これにより、右側板２と左側板４の間の間隔が一定に保持されている。
【００３４】
上記構成の外箱を組立てる場合、まず、従来と同じように一体的に形成された右側板２、天板３及び左側板４と、内箱１１と、表板６とを組立てて、補強用アングル９を右側板２及び左側板４に固定する。次に、補強部材１０の両端を、ビス１２によって左右の補強用アングル９、９に固定し、その後、底板５を取付ける。
【００３５】
ここで、底板５について、図３を基にして説明すると、底板５の裏板側の底板端部５ａは折曲され、その先端側が裏板７に平行となるように形成されている。また、補強部材１０は、底板端部５ａに沿うように断面略Ｌ字型に形成されている。
【００３６】
補強用アングル９、９に固定された補強部材１０の外側に底板端部５ａの内側が当接され、底板５は補強部材１０に支持される。このように補強部材１０と底板端部５ａとが接する構造としたことで、底板端部５ａの強度が高められる。
【００３７】
裏板７を閉じると、裏板７は、底板端部５ａの外側に当接する。このとき、底板端部５ａの強度が高いことから、シールラインが良好に保たれ、裏板７と底板端部５ａとは密着状態を維持する。
【００３８】
また、裏板７の先端側は折曲されて、底板端部５ａの外面に沿う形状とされている。これにより、裏板７と底板５との密着面積を大きくすることができ、シール性を高めて断熱材の漏出を防止することが可能となる。
【００３９】
さらに、補強部材１０の裏板側先端が底板端部５ａよりも延伸され、段差１０ａが形成されている。段差１０ａは、裏板７に当接して底板端部５ａの外面と面一になる。このとき、段差１０ａは、底板端部５ａの外面よりも裏板側に突出するように形成しておけば、裏板７を閉じた際に、裏板７に押圧されて段差１０ａに弾性力がはたらき、より密着力を高めることが可能となる。これにより、補強部材１０は、裏板７と底板端部５ａの間から発泡断熱材が漏出するのを防止するシール材としての機能をも備えている。
【００４０】
図２に示すように、外箱１は、裏板７以外の部材を組立てた状態で裏板側を上に向けて発泡治具１３内に収容される。この発泡治具１３は、外箱を収容する発泡治具本体１３ｂと、この発泡治具本体１３ｂに開閉自在に取付けられた上蓋１３ａとから構成されている。
【００４１】
発泡治具本体１３ｂは、展開・組立てが可能な構造とされており、展開した状態で外箱１を所定位置にセットした後、組立てて、外箱１を収容するようになっている。このようにして組立てられた発泡治具本体１３ｂは、裏板を除く外箱１の各板に密着した状態で固定される。
【００４２】
裏板７の周縁は折曲されて折曲部８が形成されている。右側板２、天板３及び左側板４の裏板側の端部は、先端側を折り曲げてフランジ部１４が形成されている。フランジ部１４は、折曲部８を嵌合する溝１４ａを有している。
【００４３】
裏板７を閉じた状態では、右側板２に形成されたフランジ部１４ｒには折曲部が嵌合し、フランジ部１４ｌには折曲部８ｌが、フランジ部１４ｔには折曲部８ｔが、それぞれ嵌合する。底板５の端部には、配線材や配管を引き出すための切欠き１６が形成されていることから、フランジ部を形成せず、前述のごとく、折曲部８ｂを裏板７端部の外面に密着させる構造となっている。
【００４４】
なお、折曲部８ｒ、８ｔ、８ｌは、裏板７との間の角度が９０度より大きくなるように形成され、折曲部の先端が、フランジ部１４の溝１４ａの位置を越えるように設定されている。
【００４５】
折曲部８ｒ、８ｔ、８ｌと、フランジ部１４、１４ｔ、１４ｌとの位置関係を図４により説明すると、図は折曲部８ｒとフランジ部１４ｒとの位置関係を示す断面図であり、折曲部８ｒの先端は、寸法Ｅだけ溝１４ａを越えた地点に位置している。
【００４６】
従って、折曲部８ｒを、溝１４ａに嵌合したときには、折曲部８ｒは、寸法Ｅの分だけ内側に押圧されるため、弾性力により溝１４ａの側壁に密着して断熱材の漏出を防止する構造とされている。折曲部８ｔ、８ｌと、フランジ部１４ｔ、１４ｌとの位置関係についても同じとなっている。
【００４７】
図５〜７は、本実施形態において、外箱内に発泡断熱材原液を注入する手順を示す図であり、図５は、発泡断熱材原液を注入する状態を示す外箱の断面図を、図６は図５における要部拡大図を、図７は発泡断熱材原液を注入し終わった状態を示す外箱の断面図を、夫々示す。
【００４８】
図５に示すように、外箱内に発泡断熱材原液を注入する際には、裏板７の折曲部８ｔを天板３のフランジ部１４ｔに挿入し、底板側を予め設定された開放角度Iで開口した状態に保ち、この状態で開口部より断熱材注入ヘッド１７を外箱１と内箱１１の間の空間に挿入し、規定量の発泡性断熱材１８の原液を注入する。注入された流体状の断熱材原液は、横置された外箱の下部、すなわち、表板側の全域流れ込み、数十秒後に発泡が始まる。
【００４９】
図５の円Ｎで囲まれた部分の拡大図を図６に示す。図に示すように、折曲部８ｒ及び８ｌでは、底板側よりも天板側の方が高さＦだけ高く形成され、この部分がガイド１５となる。
【００５０】
すなわち、折曲部８ｔをフランジ部１４ｔに挿入した状態で底板側を持ち上げると、ガイド１５の分だけより広範囲にわたって折曲部８ｒ及び８ｌが、フランジ部１４ｒ及び１４ｌに挿入される。
【００５１】
したがって、裏板７を閉める際に、折曲部とフランジ部との位置ずれが生じにくく、スムーズに裏板７を閉めることが可能になる。なお、図では左側板４のフランジ部１４ｌと折曲部８ｌとの嵌合状態について示しているが、右側板４のフランジ部１４ｒと折曲部８ｒとの嵌合状態も同じとされている。
【００５２】
その後、図７に示すように、断熱材１８原液を注入完了と同時に、断熱材注入ヘッド１７を移動前の位置に戻し、裏板７を折曲部８ｔを中心として回転させる形で折曲部８ｒ、８ｌをフランジ部１４ｒ、１４ｌにそれぞれ完全に嵌合させ、同時に、折曲部８ｂを底板５に密着させる。このようにして、完全な外箱１とした後、発泡治具の上蓋１３ａを閉めて固定する。
【００５３】
図７において、断熱材１８の原液はすでに発泡中であり、基本的な発泡充填は数分で終了するため、短時間のうちに裏板７を取り付け、箱体を構成することが要点となる。このため、できるだけ折曲部８ｒ、８ｌの多くの部分がフランジ部１４ｒ、１４ｌに挿入された状態になるように開放角度Iを設定しておく。さらに、前述したように、裏板７の折曲部８ｒ、８ｌの回転中心に近い側の一部にガイド１５を設けることで、より短時間で裏板７の取り付けを可能としている。
【００５４】
このような部品構成であると、迅速に組立を完了することが可能であるため、断熱材注入後、発泡が完了する前に裏板７を閉め、箱体を形成しても何ら不具合なく高圧の発泡に耐えることができ、断熱材の漏出のない断熱箱体の製造が可能である。
【００５５】
［第２の実施形態］
本発明の第２の実施形態を図８〜１０に示す。図８は発泡断熱材原液を注入する状態を示す外箱の斜視図を、図９は注入された発泡断熱材の分布を示す外箱の断面図を、図１０は発泡断熱材原液を注入し終わった状態を示す外箱の断面図を、夫々示す。
【００５６】
本実施形態においては、断熱箱体の構造は、第１の実施形態と同じとされているが、発泡治具１３の上蓋１３ａが発泡治具本体１３ｂから分離可能とされた点が特徴とされ、これにより注入ヘッドの可動範囲を広くすることが可能となる。
【００５７】
すなわち、図８に示すように、外箱１は、裏板７以外の部材を組立てた状態で裏板側を上に向けて発泡治具１３内に収容される。この発泡治具１３は、上蓋１３ａが発泡治具本体１３ｂから脱着自在とされている。発泡治具本体１３ｂは、第１の実施形態と同じように、展開・組立てが可能な構造とされており、展開した状態で外箱１を所定位置にセットした後、組立てて、外箱１を収容するようになっている。
【００５８】
裏板７は、磁性体１９によって上蓋１３ａに止められており、上蓋１３ａを発泡治具本体１３ｂに固定することによって、同時に裏板７が外箱１に装着されるようになっている。
【００５９】
外箱内に発泡断熱材原液を注入する際には、図８に示すように、裏板７を止めた上蓋１３ａを外箱１から離れた位置に置いておき、裏板７を外すことによって外箱１に生じる開口部から外箱１と内箱１１の間の空間に発泡断熱材１８の原液を注入する。
【００６０】
このような製造方法にあっては、発泡断熱材１８を注入するための注入口２１を必要とせず、また、外箱１の裏面が完全な開口状態にあるために、発泡断熱材１８の原液の注入位置を自由に選択することができる。したがって、発泡断熱材の適正な発泡充填状態を得るべく、注入ヘッド１７をトラバース（図８中、矢印で示す）することで、充填される発泡断熱材１８の密度分布、ならびに断熱性能も均一に確保することができると共に、断熱材の漏出を防止し、断熱材原液の注入量の削減が可能になるという、極めて顕著な効果を得ることができる。
【００６１】
さらに、注入ヘッド１７をトラバースした場合の効果について、図９を基に説明する。注入ヘッド１７を図中矢印に示すようにトラバースしながら発泡断熱材１８の原液を外箱内の空間に注入すると、発泡断熱材１８は外箱１の表面部に均一に溜まる。したがって、流動距離が一定になって発泡成長が均一に行われ、発泡断熱材密度の不均一、気泡の乱れ、ガスボイドの発生が確実に解消される。また、空間の容積の変化に対応してトラバースの速度を変化させることで、より密度の均一化を図ることができる。
【００６２】
発泡断熱材１８の注入を完了した後、図１０の矢印の如く、発泡冶具上蓋１３ａを発泡治具本体１３ｂに固定する。これにより、外箱１の開口部は、裏板７で被われて閉じられる。
【００６３】
【発明の効果】
以上の説明から明らかなように、本発明によると、開閉板を開けた状態の外箱内に発泡断熱材原液を注入するようにしたため、構造が簡単で、発泡断熱材原液を注入する注入ヘッドの可動範囲が大きく、外箱と内箱との間の空間に注入される発泡断熱材原液の分布を均一にすることができるため、ムラのない適正な発泡により断熱材の断熱性能の均一化が可能となる。また、注入口を廃止したため、従来のように注入口から発泡断熱材が漏出するおそれがない。
【００６４】
外箱として左右側板及び天板が一体的に形成されたものを使用する場合、左右側板間に両側板間の間隔を保持するための補強部材を設け、左右側板、天板、補強部材、底板、表板及び内箱を組立てた後、裏板を開けた状態で、外箱内に発泡断熱材原液を注入するようにしたため、裏板をスムーズかつ確実に閉じることができ、断熱材原液の漏出を防止することが可能となる。
【００６５】
補強部材を、底板の端部に当接させるようにすれば、裏板が開いた状態にもかかわらず、シールラインとなる底板端部の強度を高めてシール性を向上させることができ、発泡断熱材の漏出を防止することが可能となる。
【００６６】
補強部材は、底板端部から裏板にかけて形成し、かつ裏板に当接する形状とすれば、補強部材が裏板と底板の隙間に対するシール材として機能するため、発泡断熱材の漏出をより効果的に防止することが可能となる。
【００６７】
また、裏板の周縁を折曲して折曲部が形成され、前記左右側板又は天板に折曲部を嵌合可能とするフランジ部が形成されるとともに、前記折曲部をフランジ部に案内するためのガイドが設けられた構成を採用すれば、折曲部をスムーズにフランジ部に嵌合することが可能となる。
【図面の簡単な説明】
【図１】第１の実施形態を示す裏板を外した状態の外箱の斜視図
【図２】上記外箱を発泡治具に収容した状態を示す斜視図
【図３】図２における補強部材の断面図
【図４】折曲部とフランジ部との位置関係を示す断面図
【図５】発泡断熱材原液を注入する状態を示す外箱の断面図
【図６】図５における要部拡大図
【図７】発泡断熱材原液を注入し終わった状態を示す外箱
【図８】第２の実施形態を示す外箱の斜視図
【図９】図８における注入された発泡断熱材の分布を示す外箱の断面図
【図１０】発泡断熱材原液を注入し終わった状態を示す外箱の断面図
【図１１】従来の断熱箱体の分解斜視図
【図１２】上記断熱箱体を発泡治具に収容する様子を示す斜視図
【図１３】従来の断熱箱体の注入口の構造を示す概略図
【図１４】上記注入口に注入ヘッドを挿入した状態を示す断面図
【図１５】従来の断熱箱体に発泡断熱材原液を注入した状態を示す断面図
【図１６】従来の断熱箱体における裏板と底板との接合部を示す断面図
【符号の説明】
１外箱
２右側板
３天板
４左側板
５底板
５ａ底板端部
６表板
７裏板
８折曲部
１０補強部材
１１内箱
１３発泡治具
１３ａ上蓋
１４フランジ部
１５ガイド
１７注入ヘッド
１８発泡断熱材
１９磁性体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat insulating box used for a refrigerator or the like and a method for manufacturing the same.
[0002]
[Prior art]
In the conventional heat insulating box of the refrigerator, as shown in FIG. 11, a unit body in which the top plate 3 and the left and right side plates 2, 4 are integrally formed, an inner box 11, a front plate 6, a bottom plate 5, a back plate 7, and After the reinforcement angle 9 is combined, it is housed in the foaming jig 13 in a state of being tilted sideways, the jig upper lid 13a is closed, and then the heat insulating material injection head 17 is inserted from the injection port 21 opened in the back plate 7 of the heat insulating box. Then, a stock solution of the foam heat insulating material is injected into the space of the box and foamed and cured.
[0003]
At that time, in order to cope with the pressure when the box is foamed, all the surfaces to which pressure is applied are held by the foaming jig 13 as shown in FIG.
[0004]
When manufacturing a heat insulation box using a foam heat insulating material, the internal pressure at the time of foaming becomes a very big thing. For this reason, not only the strength of the foaming jig 13 but also the leakage of the heat insulating material has always been a problem at the joints of the parts constituting the box. In such a situation, the treatment of the injection port 21 for injecting the stock solution of the foam heat insulating material is one problem.
[0005]
13 is an arrow view seen from the direction A in FIG. At present, as shown in the figure, an inlet cover 22 made of an elastic material such as steel paper is attached in advance with an adhesive tape 26 inside the inlet 21 opened in the back plate 7 which is the back of the refrigerator. . In this state, as shown in FIG. 14, when the heat insulating material injection head 17 is inserted into the injection port 21, and the heat insulating material stock solution is injected and then the injection head 10 is pulled out, the injection port cover 22 returns to its original state by elastic force. Thus, the inlet 21 is blocked to prevent leakage of the heat insulating material from the inside.
[0006]
[Problems to be solved by the invention]
However, since the sealing of the inlet 21 depends on the elastic force of the inlet cover 22, it is difficult to completely seal the inlet, and leakage may occur as indicated by the arrow B in FIG. In such a case, it takes time to correct the peripheral portion even if the amount of leakage of the heat insulating material is small. In addition, in order to obtain good heat insulation characteristics, it is necessary to maintain a sufficient pressure until foaming is completed. However, if a large amount of leakage occurs, the internal pressure does not rise sufficiently, and the heat insulation characteristics deteriorate. It will be.
[0007]
Although the setting of the position of the inlet 21 is determined at the time of design, it is at a position where a stable foam filling state can be obtained due to restrictions such as foam manufacturing equipment, foam jig structure, and heat insulation box structure. It is very difficult to form, and it is possible to overfill with foam heat insulating material at the time of manufacture, or to additionally form a plurality of vent holes (not shown) in the back plate 7, the bottom plate 5, the inner box 11, etc. is doing.
[0008]
Further, when the injection port 21 is fixed, as shown in FIG. 15, the stock solution of the foam heat insulating material 18 injected into the outer box 1 tends to accumulate in a “mountain” at the drop position R. The injected stock solution of the foam insulation 18 starts to foam and spreads into the space in the outer box. However, depending on the setting position of the injection port 21, it accumulates in a “mountain” state, so that uniform foaming is achieved. Is not performed, resulting in non-uniform foam insulation density, turbulence of bubbles, gas voids, and the like.
[0009]
Moreover, the case where the change of the position of the injection port 21 is required also occurs. In that case, there was a problem that a great deal of cost and labor were required, such as changing the mold and foaming jig. In recent years, with the increase in size of refrigerators, there is a tendency to increase the number of inlets to the heat insulation box from two to four, which is a further improvement issue.
[0010]
In addition, as shown in FIG. 16, the joint between the back plate 7 and the bottom plate 5 prevents leakage of the heat insulating material by using a sealing cushion material 23 such as soft urethane foam, but the back plate 7 and the bottom plate 5. It is an unstable state in which an effect can be obtained only when and are properly combined.
[0011]
Furthermore, as shown in FIG. 12, the bottom plate 5 has a notch 16 (FIG. 11) for drawing out the wiring member 24 and the piping 25 from the inside, and the cushion member 23 is bent at that portion. It is difficult to maintain the combination shape (insulating material seal line) and leakage of the insulating material occurs (arrow G in FIG. 16).
[0012]
The present invention is a heat insulating box that has a simple structure, does not leak heat insulating material, has excellent appearance, and can be uniformly filled with foamed heat insulating material and has excellent heat insulating characteristics, without forming an inlet on the back plate. It aims to manufacture.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, a heat insulating box body in which a foamed heat insulating material stock solution is injected and foamed into a space between an inner box and an outer box composed of left and right side plates, a top plate, a bottom plate, a front plate and a back plate. At the time of manufacturing, at least one plate constituting the outer box is made an openable / closable opening / closing plate, and the foam insulation material solution is injected into the outer box with the opening / closing plate opened, and then the opening / closing plate is closed and the foam insulation is closed. The material stock solution is made to foam.
[0014]
In other words, in the present invention, the outer casing is completely assembled, and the heat insulating material stock solution is not injected from the inlet formed in the back plate, but the foam heat insulating material raw solution is injected into the outer box with the opening and closing plate opened. I tried to do it. Therefore, the structure is simple, the movable range of the injection head for injecting the foam insulation material stock solution is large, and the distribution of the foam insulation material stock solution injected into the space between the outer box and the inner box can be made uniform. The proper foaming without unevenness makes it possible to make the heat insulation performance of the heat insulating material uniform.
[0015]
Moreover, since the said heat insulation box eliminated the injection port, there is no possibility that a foaming heat insulating material may leak from an injection port conventionally, and all surfaces of an outer box are covered so that it may closely_contact | adhere with a foaming jig. Therefore, it is possible to prevent the heat insulating material from leaking from the periphery of the opening / closing plate.
[0016]
Injection | pouring of foaming heat insulating material undiluted | stock solution may be performed in the state which lifted one side of the opening / closing plate from the outer box, and may be performed in the state which removed the opening / closing plate from the outer box. The opening / closing plate may be at least one of the left and right side plates, the top plate, the bottom plate, the front plate, and the back plate. It is preferable in that it can be distributed uniformly.
[0017]
Moreover, in the conventional heat insulation box, the thing in which the right-and-left side board and top plate which comprise an outer box were integrally formed from viewpoints, such as an intensity | strength surface and an external appearance surface, is generally used. In the heat insulation box having such a configuration, when the back plate is an opening / closing plate, the top plate side is strong but the bottom plate side is low in strength and the distance between the left and right side plates is maintained when the back plate is removed. Otherwise, it may be difficult to close the back plate after injecting the foam insulation material stock solution.
[0018]
Therefore, in the present invention, when using an integrally formed left and right side plate and top plate as an outer box, a reinforcing member is provided between the left and right side plates to maintain a space between both side plates, After assembling the top plate, reinforcing member, bottom plate, front plate and inner box, with the back plate open, inject the foam insulation stock solution into the outer box, then close the back plate and supply the foam insulation material stock solution A foaming method can be adopted. The heat insulating box thus obtained is characterized in that the left and right side plates and the top plate are integrally formed, and a reinforcing member is provided between the left and right side plates to maintain the distance between the both side plates. It is.
[0019]
According to the said structure, a back plate can be closed smoothly and reliably, and it becomes possible to prevent the heat insulating material stock solution from leaking out.
[0020]
The left and right side plates and the top plate are integrally formed. The left and right side plates and the top plate are formed as separate members, as well as the left and right side plates and the top plate formed by bending one plate. , Meaning that these are integrated using an appropriate fixing means such as bolts and nuts.
[0021]
The position where the reinforcing member is provided is not particularly limited as long as the space between the left and right side plates can be maintained, but if the space is provided between the left and right side plates so as to contact the bottom plate, the space between the side plates can be maintained. In addition, since the bottom plate can be fixed at an appropriate position, the back plate can be more reliably closed.
[0022]
In this case, the reinforcing member is preferably brought into contact with the end portion of the bottom plate. In other words, the bottom plate is formed such that a part or all of the bottom plate is bent at the end on the back plate side (hereinafter abbreviated as “bottom plate end”) and the front end is opposed to the back plate. The outside of the part is in contact with the back plate to prevent leakage of the foam insulation.
[0023]
Therefore, if the reinforcing member is arranged so as to be in contact with the inside of the bottom plate end portion, the strength of the bottom plate end portion serving as a seal line can be increased and the sealing performance can be improved regardless of the state where the back plate is open. It becomes possible to prevent leakage of the foam insulation.
[0024]
If the reinforcing member is formed from the end of the bottom plate to the back plate and is in contact with the back plate, the reinforcing member functions as a sealant for the gap between the back plate and the bottom plate, so that the leakage of foam insulation is more effective Can be prevented.
[0025]
In addition, since the bottom plate end is bent and formed three-dimensionally as described above, the strength of the reinforcing member can be further increased if the reinforcing member has a three-dimensional shape along the bottom plate end. Thus, the bottom plate can be securely fixed and the sealing performance can be further improved.
[0026]
Further, in the present invention, a bent portion is formed by bending the peripheral edge of the back plate, and a flange portion that allows the bent portion to be fitted to the left and right side plates or the top plate is formed. It is possible to employ a configuration in which a guide for guiding the portion to the flange portion is employed, whereby the bent portion can be smoothly fitted to the flange portion. The bent portion may be formed by bending a peripheral edge of the back plate and joining a plate having an appropriate width to the back plate.
[0027]
As a guide, when the bottom plate side of the back plate in the closed state is lifted and the foam insulation material solution is injected, the bent portion (referred to as the bent portion on the left and right side plate side) fitted to the flange portion of the left and right side plates is used. The top plate side can be formed higher than the bottom plate side, and this can be used as a guide.
[0028]
In this case, since the bent portion on the top plate side is formed high, even when the bottom plate side of the back plate is lifted, the bent portion on the left and right side plate side is fitted to the flange portion over a wide range. It becomes a state, and it becomes difficult to produce position shift with a bending part and a flange part, and it becomes possible to close a back board smoothly.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the heat insulation box and the manufacturing method thereof according to the present invention will be described with reference to the drawings. In addition, in the figure, the same code | symbol is attached | subjected about the component same as a prior art.
[0030]
[First Embodiment]
A first embodiment of the present invention is shown in FIGS. FIG. 1 is a perspective view of the outer box with the back plate removed, FIG. 2 is a perspective view of the outer box accommodated in a foaming jig, and FIG. 3 is a cross-sectional view of the reinforcing member.
[0031]
The outer box 1 according to the present invention includes a right side plate 2, a top plate 3, a left side plate 4, a bottom plate 5, a front plate 6 and a back plate 7, and the right side plate 2, the top plate 3, the left side plate 4, and the bottom plate. The back plate 7 can be opened and closed in a state where the 5 and the front plate 6 are assembled.
[0032]
The right side plate 2, the top plate 3, and the left side plate 4 are integrally formed by bending one plate, and a reinforcing angle 9 is attached to the lower part of the right side plate 2 and the left side plate 4. Yes. The reinforcing angle 9 is L-shaped along the bottom plate side edge from the bottom plate side edge of the left and right side plates 2 and 4.
[0033]
Between the pair of left and right reinforcing angles 9, 9, a reinforcing member 10 is placed and fixed, so that the distance between the right side plate 2 and the left side plate 4 is kept constant.
[0034]
When assembling the outer box having the above structure, first, the right side plate 2, the top plate 3 and the left side plate 4, the inner box 11 and the front plate 6 which are integrally formed as in the prior art are assembled and used for reinforcement. The angle 9 is fixed to the right side plate 2 and the left side plate 4. Next, both ends of the reinforcing member 10 are fixed to the left and right reinforcing angles 9 and 9 with screws 12, and then the bottom plate 5 is attached.
[0035]
Here, the bottom plate 5 will be described with reference to FIG. 3. The bottom plate end portion 5 a on the back plate side of the bottom plate 5 is bent and formed so that the front end side thereof is parallel to the back plate 7. The reinforcing member 10 is formed in a substantially L-shaped cross section along the bottom plate end portion 5a.
[0036]
The inside of the bottom plate end portion 5 a is in contact with the outside of the reinforcing member 10 fixed to the reinforcing angles 9, 9, and the bottom plate 5 is supported by the reinforcing member 10. Since the reinforcing member 10 and the bottom plate end portion 5a are in contact with each other as described above, the strength of the bottom plate end portion 5a is increased.
[0037]
When the back plate 7 is closed, the back plate 7 contacts the outside of the bottom plate end 5a. At this time, since the strength of the bottom plate end portion 5a is high, the seal line is kept good, and the back plate 7 and the bottom plate end portion 5a maintain a close contact state.
[0038]
Moreover, the front end side of the back plate 7 is bent to have a shape along the outer surface of the bottom plate end portion 5a. Thereby, the contact | adherence area of the backplate 7 and the baseplate 5 can be enlarged, it becomes possible to improve the sealing performance and to prevent the heat insulating material from leaking out.
[0039]
Furthermore, the back plate side front end of the reinforcing member 10 is extended more than the bottom plate end portion 5a to form a step 10a. The step 10a contacts the back plate 7 and is flush with the outer surface of the bottom plate end 5a. At this time, if the step 10a is formed so as to protrude from the outer surface of the bottom plate end portion 5a to the back plate side, when the back plate 7 is closed, it is pressed by the back plate 7 and elastic force is applied to the step 10a. Works, and it becomes possible to further increase the adhesion. Thereby, the reinforcement member 10 is also provided with the function as a sealing material which prevents a foaming heat insulating material from leaking out between the backplate 7 and the baseplate edge part 5a.
[0040]
As shown in FIG. 2, the outer box 1 is housed in the foaming jig 13 with members other than the back plate 7 assembled and with the back plate side facing up. The foaming jig 13 includes a foaming jig main body 13b for housing the outer box, and an upper lid 13a attached to the foaming jig main body 13b so as to be freely opened and closed.
[0041]
The foaming jig main body 13b has a structure that can be expanded and assembled. After the outer box 1 is set at a predetermined position in the expanded state, it is assembled and accommodated. The foam jig main body 13b assembled in this manner is fixed in close contact with each plate of the outer box 1 excluding the back plate.
[0042]
The periphery of the back plate 7 is bent to form a bent portion 8. The end portions on the back plate side of the right side plate 2, the top plate 3 and the left side plate 4 are bent at the front end side to form a flange portion 14. The flange portion 14 has a groove 14 a into which the bent portion 8 is fitted.
[0043]
In a state where the back plate 7 is closed, a bent portion is fitted to the flange portion 14r formed on the right side plate 2, a bent portion 8l is formed on the flange portion 141, and a bent portion 8t is provided on the flange portion 14t. Mate with each other. Since the notch 16 for drawing out the wiring material and the piping is formed at the end portion of the bottom plate 5, the flange portion is not formed, and the bent portion 8 b is connected to the outer surface of the end portion of the back plate 7 as described above. It has a structure that is closely attached to.
[0044]
The bent portions 8r, 8t, and 8l are formed so that the angle with the back plate 7 is greater than 90 degrees, and the tip of the bent portion exceeds the position of the groove 14a of the flange portion 14. Is set.
[0045]
The positional relationship between the bent portions 8r, 8t, 8l and the flange portions 14, 14t, 14l will be described with reference to FIG. 4. The drawing is a sectional view showing the positional relationship between the bent portions 8r and the flange portion 14r. The tip of the curved portion 8r is located at a point beyond the groove 14a by the dimension E.
[0046]
Therefore, when the bent portion 8r is fitted in the groove 14a, the bent portion 8r is pressed inward by the dimension E, and therefore the elastic member is brought into close contact with the side wall of the groove 14a to leak out the heat insulating material. The structure is to prevent. The positional relationship between the bent portions 8t and 8l and the flange portions 14t and 14l is the same.
[0047]
5-7 is a figure which shows the procedure which inject | pours foam insulation material stock solution in an outer case in this embodiment, FIG. 5 is sectional drawing of the outer case which shows the state which inject | pours foam insulation material stock solution, FIG. 6 is an enlarged view of a main part in FIG. 5, and FIG.
[0048]
As shown in FIG. 5, when injecting the foamed thermal insulation solution into the outer box, the bent portion 8t of the back plate 7 is inserted into the flange portion 14t of the top plate 3, and the bottom plate side is opened in advance. Keeping the state opened at an angle I, in this state, the heat insulating material injection head 17 is inserted into the space between the outer box 1 and the inner box 11 through the opening, and a prescribed amount of the foamable heat insulating material 18 is injected. The injected fluid-like heat insulating material stock solution flows into the lower part of the laterally placed outer box, that is, the entire area on the front plate side, and foaming starts after several tens of seconds.
[0049]
FIG. 6 shows an enlarged view of a portion surrounded by a circle N in FIG. As shown in the figure, in the bent portions 8r and 8l, the top plate side is formed higher by the height F than the bottom plate side, and this portion becomes the guide 15.
[0050]
That is, when the bottom plate side is lifted with the bent portion 8t inserted into the flange portion 14t, the bent portions 8r and 8l are inserted into the flange portions 14r and 14l over a wider range by the guide 15.
[0051]
Therefore, when the back plate 7 is closed, positional deviation between the bent portion and the flange portion hardly occurs, and the back plate 7 can be closed smoothly. In addition, although the figure has shown about the fitting state of the flange part 14l and the bending part 8l of the left side board 4, the fitting state of the flange part 14r and the bending part 8r of the right side board 4 is also made the same. .
[0052]
Thereafter, as shown in FIG. 7, simultaneously with the completion of the injection of the heat insulating material 18 stock solution, the heat insulating material injection head 17 is returned to the position before the movement, and the back plate 7 is rotated around the bent portion 8t. 8r and 8l are completely fitted to the flange portions 14r and 14l, respectively, and at the same time, the bent portion 8b is brought into close contact with the bottom plate 5. In this way, after making the complete outer box 1, the upper lid 13a of the foaming jig is closed and fixed.
[0053]
In FIG. 7, the stock solution of the heat insulating material 18 is already foaming, and the basic foam filling is completed in a few minutes. Therefore, it is essential to attach the back plate 7 in a short time to configure the box. . For this reason, the opening angle I is set so that as many portions as possible of the bent portions 8r and 8l are inserted into the flange portions 14r and 14l. Furthermore, as described above, the back plate 7 can be attached in a shorter time by providing the guide 15 on a part of the back plate 7 near the rotation center of the bent portions 8r and 8l.
[0054]
With such a component structure, it is possible to complete the assembly quickly, so after injecting the heat insulating material, before the foaming is completed, the back plate 7 is closed and a box is formed. It is possible to produce a heat insulating box body that can withstand the foaming of the heat insulating material without leaking the heat insulating material.
[0055]
[Second Embodiment]
A second embodiment of the present invention is shown in FIGS. FIG. 8 is a perspective view of the outer box showing the state of injecting the foam insulation material stock solution, FIG. 9 is a sectional view of the outer box showing the distribution of the injected foam insulation material, and FIG. 10 is the injection of the foam insulation material stock solution. Cross-sectional views of the outer box showing the finished state are shown.
[0056]
In this embodiment, the structure of the heat insulation box is the same as that of the first embodiment, but the feature is that the upper lid 13a of the foaming jig 13 can be separated from the foaming jig main body 13b. As a result, the movable range of the injection head can be widened.
[0057]
That is, as shown in FIG. 8, the outer box 1 is accommodated in the foaming jig 13 with the back plate side facing upward in a state where members other than the back plate 7 are assembled. The foaming jig 13 has an upper lid 13a that is detachable from the foaming jig body 13b. As in the first embodiment, the foam jig main body 13b has a structure that can be expanded and assembled. After the outer box 1 is set at a predetermined position in the expanded state, the outer casing 1 is assembled. Is supposed to be housed.
[0058]
The back plate 7 is fixed to the upper lid 13a by a magnetic body 19, and the back plate 7 is simultaneously mounted on the outer box 1 by fixing the upper lid 13a to the foaming jig body 13b.
[0059]
When injecting the foam insulation material stock solution into the outer box, as shown in FIG. 8, the upper lid 13a with the back plate 7 stopped is placed at a position away from the outer box 1, and the back plate 7 is removed. A stock solution of the foam heat insulating material 18 is injected into the space between the outer box 1 and the inner box 11 from the opening formed in the outer box 1.
[0060]
In such a manufacturing method, the injection port 21 for injecting the foam heat insulating material 18 is not required, and the back surface of the outer box 1 is in a completely open state. The injection position can be freely selected. Therefore, in order to obtain an appropriate foam filling state of the foam heat insulating material, by traversing the injection head 17 (indicated by an arrow in FIG. 8), the density distribution of the foam heat insulating material 18 to be filled and the heat insulating performance are uniform. While being able to ensure, the leak of a heat insulating material can be prevented and the remarkable remarkable effect that the injection amount of a heat insulating material stock solution can be reduced can be acquired.
[0061]
Further, the effect when the injection head 17 is traversed will be described with reference to FIG. When the stock solution of the foam heat insulating material 18 is injected into the space in the outer box while traversing the injection head 17 as indicated by the arrows in the figure, the foam heat insulating material 18 is uniformly accumulated on the surface portion of the outer box 1. Therefore, the flow distance is constant and the foam growth is performed uniformly, and the non-uniformity of the foam heat insulating material density, the disorder of the bubbles, and the generation of gas voids are surely eliminated. Further, the density can be made more uniform by changing the traverse speed in response to the change in the volume of the space.
[0062]
After completing the injection of the foam heat insulating material 18, the foam jig upper lid 13a is fixed to the foam jig main body 13b as shown by the arrow in FIG. As a result, the opening of the outer box 1 is covered with the back plate 7 and closed.
[0063]
【The invention's effect】
As is clear from the above description, according to the present invention, the foam insulation material stock solution is injected into the outer box with the opening and closing plate open, so that the structure is simple and the injection head for injecting the foam insulation material stock solution Since the movable range is large and the distribution of the foam insulation solution injected into the space between the outer box and the inner box can be made uniform, the insulation performance of the insulation is made uniform by proper foaming without unevenness. Is possible. Moreover, since the injection port is abolished, there is no possibility that the foamed heat insulating material leaks from the injection port as in the prior art.
[0064]
When using a left and right side plate and top plate integrally formed as an outer box, a reinforcing member is provided between the left and right side plates to maintain the space between both side plates, and the left and right side plates, top plate, reinforcing member and bottom plate are provided. After assembling the front plate and the inner box, the foam insulation material solution was injected into the outer box with the back plate opened, so that the back plate could be closed smoothly and reliably. It becomes possible to prevent leakage.
[0065]
If the reinforcing member is brought into contact with the end portion of the bottom plate, it is possible to increase the strength of the end portion of the bottom plate serving as a seal line and improve the sealing performance in spite of the open state of the back plate. It becomes possible to prevent leakage of the heat insulating material.
[0066]
If the reinforcing member is formed from the end of the bottom plate to the back plate and is in contact with the back plate, the reinforcing member functions as a sealant for the gap between the back plate and the bottom plate, so that the leakage of foam insulation is more effective Can be prevented.
[0067]
In addition, a bent portion is formed by bending the peripheral edge of the back plate, and a flange portion that allows the bent portion to be fitted to the left and right side plates or the top plate is formed, and the bent portion is used as the flange portion. If the structure provided with the guide for guiding is employ | adopted, it will become possible to fit a bending part to a flange part smoothly.
[Brief description of the drawings]
FIG. 1 is a perspective view of an outer box with a back plate removed, showing a first embodiment. FIG. 2 is a perspective view showing a state in which the outer box is housed in a foaming jig. 4 is a cross-sectional view of a member. FIG. 4 is a cross-sectional view showing a positional relationship between a bent portion and a flange portion. FIG. 5 is a cross-sectional view of an outer box showing a state in which a foamed thermal insulation material stock solution is injected. Enlarged view FIG. 7 is an outer box showing a state where the foam insulation material stock solution has been injected. FIG. 8 is a perspective view of the outer box showing the second embodiment. FIG. 10 is a cross-sectional view of the outer box showing the state after the injection of the foamed heat insulating material stock solution. FIG. 11 is an exploded perspective view of the conventional heat insulating box. FIG. 13 is a schematic view showing the structure of the inlet of a conventional heat insulation box. FIG. FIG. 15 is a cross-sectional view showing a state in which a foamed thermal insulation material stock solution is injected into a conventional heat insulation box. FIG. 16 is a cross-sectional view showing a state where a back plate and a bottom plate are joined in a conventional heat insulation box. Sectional view shown [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer box 2 Right side plate 3 Top plate 4 Left side plate 5 Bottom plate 5a Bottom plate edge part 6 Front plate 7 Back plate 8 Bending part 10 Reinforcement member 11 Inner box 13 Foaming jig 13a Top lid 14 Flange part 15 Guide 17 Injection head 18 Foaming Heat insulation material 19 Magnetic material

Claims

A method for producing a heat insulating box body in which a foam heat insulating material undiluted solution is injected and foamed into a space between an outer box composed of a left right side plate, a top plate, a bottom plate, a front plate and a back plate, and an inner box, the back plate constituting the outer box and openable closing plate to form a bent portion by bending the peripheral edge of said back plate, a flange portion which can be fitted to the bent portion to the left and right side plates In the state where the bottom plate side of the back plate is lifted from the outer box, a guide for guiding the bent portion to the flange portion is provided, and a foam heat insulating material is formed in the space between the outer box and the inner box A method for producing a heat insulation box, wherein the stock solution is injected, and then the back plate is closed to foam the foam heat insulating material stock solution.

An angle between the back plate and a bent portion formed by bending the periphery thereof is formed to be greater than 90 degrees, and the tip of the bent portion is elastically applied to the side wall of the groove of the flange portion. The method for manufacturing a heat insulating box according to claim 1, wherein leakage of the heat insulating material is prevented by the close contact.

The left and right side plates and the top plate are integrally formed, a reinforcing member is provided between the left and right side plates to maintain a space between both side plates, and after the outer box is assembled, foaming is performed with the back plate opened. The manufacturing method of the heat insulation box of Claim 1 or 2 characterized by the above-mentioned.

Foam filled in the space formed by the outer box composed of the left right side plate, top plate, back plate, bottom plate and front plate, the inner box attached inside the outer box, and the outer box and inner box and a heat insulating material, the side plates and top plate are integrally formed, a reinforcing member for maintaining a gap of between both side plates provided between the left and right side plates, folded by bending the peripheral edge of the back plate A bent portion is formed, and a flange portion that allows the bent portion to be fitted to the left and right side plates is formed, and in the state where the bottom plate side of the back plate is lifted from the outer box, the bent portion is used as the flange portion. A heat insulating box characterized in that a guide for guiding is provided .

The heat insulating box according to claim 4 , wherein the guide is formed such that the height of the bent portion fitted to the flange portion of the left and right side plates is higher on the top plate side than on the bottom plate side.

The heat insulation box according to claim 4 , wherein the reinforcing member is disposed so as to contact the bottom plate.

The end of the bottom plate is formed to face the back plate, the outside of the bottom plate end is in contact with the back plate, and the reinforcing member is arranged to contact the inside of the bottom plate end. The heat insulation box of Claim 6 .

The heat insulation box according to claim 7 , wherein the reinforcing member is formed from the bottom plate end portion to the back plate and is in contact with the back plate.

The heat insulation box of Claim 7 or 8 made into the shape where the said reinforcement member follows a baseplate edge part.