JP4082073B2

JP4082073B2 - Piping joint structure in heat exchanger

Info

Publication number: JP4082073B2
Application number: JP2002113518A
Authority: JP
Inventors: 則昌馬場; 庄二杁山
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2002-04-16
Filing date: 2002-04-16
Publication date: 2008-04-30
Anticipated expiration: 2022-04-16
Also published as: JP2003307399A

Description

【０００１】
【発明の属する技術分野】
本発明は、熱交換器における流体出入口の配管接合構造に関するもので、車両空調用蒸発器に用いて好適である。
【０００２】
【従来の技術】
従来、車両空調用蒸発器等の熱交換器では、その内部を流れる流体の流体出入口を形成する流体出入口部材を設け、この流体出入口部材に、流体の導入用配管および流体の導出用配管をろう付けにより接合している。
【０００３】
この配管接合の方法は、具体的には、（１）熱交換器組立構造の一体ろう付けと同時に配管もろう付けする方法と、（２）熱交換器組立構造を一体ろう付けし、その後に、配管部分を別途独立にろう付けする方法とに大別される。
【０００４】
【発明が解決しようとする課題】
ところで、車両用熱交換器の場合、熱交換器に一体接合される配管部分の長さが車種毎のバリエーションにより種々変更される。従って、前者の方法（１）であると、ろう付け設備および熱交換器の気密検査装置は、車種毎のバリエーションのうち最大長さの配管にも対応できるように大型化しなければならず、製造設備費が高くつく。
【０００５】
また、後者の方法（２）であると、熱交換器組立構造だけを一体ろう付けするので、配管部分がない分、ろう付け設備を小型化できる。しかし、熱交換器の気密検査設備は後者の方法（２）でも以下の理由にてやはり大型化しなければならない。
【０００６】
図１２は従来の熱交換器における流体出入口部材１６と、流体の導入用配管１８および流体の導出用配管１９との接合構造を示している。なお、図１２（ａ）では配管１８、１９の図示を省略している。流体出入口部材１６はプレス成形された２枚の板材１６ａ、１６ｂを最中状に接合して構成されている。すなわち、一方の板材１６ａに外側へ膨出する膨出部を成形して他方の板材１６ｂに接合することにより流体の入口通路部１６ｃおよび流体の出口通路部１６ｄを形成し、入口通路部１６ｃの端部に、２枚の板材１６ａ、１６ｂの半円筒状部１６ｅ、１６ｆの組み合わせからなる入口側円筒状嵌合部１６ｉを形成している。同様に、出口通路部１６ｄの端部に、別の半円筒状部１６ｇ、１６ｈの組み合わせからなる出口側円筒状嵌合部１６ｊを形成している。
【０００７】
そして、入口側円筒状嵌合部１６ｉの内周面に流体導入用配管１８の先端部を挿入してろう付けしている。また、出口側円筒状嵌合部１６ｊの内周面に流体導出用配管１９の先端部を挿入してろう付けしている。
【０００８】
ところで、入口側円筒状嵌合部１６ｉおよび出口側円筒状嵌合部１６ｊがそれぞれ半円筒状部１０ｅ、１０ｆ、半円筒状部１６ｇ、１６ｈの組み合わせで構成されるため、熱交換器組立構造を一体ろう付けするだけであると、この半円筒状部１０ｅ、１０ｆのろう付け接合面、および半円筒状部１６ｇ、１６ｈのろう付け接合面に、ろう付け時の溶融ろう材のひけ、ろう材フレット部でのボイド（気泡）発生等の要因により流体洩れ箇所が発生して、熱交換器組立構造の気密検査（洩れ検査）を実施できない。
【０００９】
そこで、熱交換器組立構造を一体ろう付けした後に、円筒状嵌合部１６ｉ、１６ｊの内周面に配管１８、１９の先端部を挿入してろう付けし、この配管ろう付けを行うことにより、半円筒状部１０ｅ〜１６ｈのろう付け接合面を確実に密封し、その後に、熱交換器組立構造の気密検査（洩れ検査）を実施するようにしている。
【００１０】
従って、配管１８、１９の接合により熱交換器の体格が大きくなってから、気密検査を実施するので、気密検査設備が大型化してしまう。
【００１１】
本発明は上記点に鑑みて、熱交換器のろう付け設備および密検査設備を大型化せずに、種々な長さの配管バリエーションへの対応が可能な、熱交換器における配管接合構造を提供することを目的とする。
【００１２】
【課題を解決するための手段】
上記目的を達成するため、請求項１に記載の発明では、２枚の板材（１６ａ、１６ｂ）を接合して構成される流体出入口部材（１６）に、熱交換器内部の流体通路（１１、１４、１５）の入口部と連通する流体入口通路（１６ｃ）、および流体通路（１１、１４、１５）の出口部と連通する流体出口通路（１６ｄ）を形成し、流体入口通路（１６ｃ）に２枚の板材（１６ａ、１６ｂ）の半円筒状部（１６ｅ、１６ｆ）の組み合わせからなる入口側円筒状嵌合部（１６ｉ）を形成するとともに、流体出口通路（１６ｄ）に２枚の板材（１６ａ、１６ｂ）の半円筒状部（１６ｇ、１６ｈ）の組み合わせからなる出口側円筒状嵌合部（１６ｊ）を形成し、
更に、入口側円筒状嵌合部（１６ｉ）内に挿入され、接合される第１円筒部（１７ａ）、および出口側円筒状嵌合部（１６ｊ）内に挿入され、接合される第２円筒部（１７ｂ）を有する補助嵌合部材（１７）を備え、
補助嵌合部材（１７）は、１枚の板材から第１円筒部（１７ａ）および第２円筒部（１７ｂ）を有する形状に成形されており、
補助嵌合部材（１７）には、第１円筒部（１７ａ）と第２円筒部（１７ｂ）との中間部位において第１、第２円筒部（１７ａ、１７ｂ）の突出方向と同一方向に突き出して気密検査治具（２０）を係止する係止爪部（１７ｅ）が形成されており、
第１円筒部（１７ａ）内に流体導入用配管（１８）を挿入して接合するとともに、第２円筒部（１７ｂ）内に流体導出用配管（１９）を挿入して接合することを特徴とする。
【００１３】
これによると、流体入出用配管（１８、１９）の接合前の段階において、２枚の板材（１６ａ、１６ｂ）の半円筒状部（１６ｅ、１６ｆ）の組み合わせからなる入口側円筒状嵌合部（１６ｉ）、および２枚の板材（１６ａ、１６ｂ）の半円筒状部（１６ｇ、１６ｈ）の組み合わせからなる出口側円筒状嵌合部（１６ｊ）を、それぞれ補助嵌合部材（１７）の第１、第２円筒部（１７ａ、１７ｂ）の介在により気密に接合できる。
【００１４】
そのため、熱交換器組立構造だけを一体ろう付けした状態、すなわち、流体入出用配管（１８、１９）を接合する前の熱交換器ろう付け状態にて、熱交換器内部の流体通路に対する気密検査を行うことができる。従って、流体入出用配管（１８、１９）を接合していない分だけ、ろう付け設備および気密検査設備を小型化でき、熱交換器の製造設備を低コスト化できる。また、工場内での製造設備の設置スペースを縮小できる。
【００１５】
そして、熱交換器の一体ろう付けおよび気密検査を終了した後に、種々な長さの配管（１８、１９）を補助嵌合部材（１７）の第１、第２円筒部（１７ａ、１７ｂ）内に挿入して接合することにより、種々な配管バリエーションに対して対応できる。
【００１６】
そして、請求項１に記載の発明では、補助嵌合部材（１７）は、１枚の板材から第１円筒部（１７ａ）、第２円筒部（１７ｂ）および係止爪部（１７ｅ）を有する形状に効率よく成形することができる。
【００１７】
請求項２に記載の発明では、請求項１において、補助嵌合部材（１７）に、第１、第２円筒部（１７ａ、１７ｂ）の突出方向と同一方向に突き出して２枚の板材（１６ａ、１６ｂ）の半円筒状部（１６ｅ、１６ｆ、１６ｇ、１６ｈ）の組み合わせ状態を仮固定する別の係止爪部（１７ｃ、１７ｄ）が形成されていることを特徴とする。
【００１８】
これにより、補助嵌合部材（１７）の別の係止爪部（１７ｃ、１７ｄ）により２枚の板材（１６ａ、１６ｂ）の半円筒状部（１６ｅ、１６ｆ、１６ｇ、１６ｈ）の組み合わせ状態を確実に仮固定して、半円筒状部（１６ｅ、１６ｆ、１６ｇ、１６ｈ）相互間の接合面を確実に接触させた状態でろう付けを行うことができる。その結果、半円筒状部（１６ｅ、１６ｆ、１６ｇ、１６ｈ）相互間の接合面のろう付け性を向上できる。
【００１９】
また、請求項１に記載の発明における係止爪部（１７ｅ）に加えて、補助嵌合部材（１７）の別の係止爪部（１７ｃ、１７ｄ）をも気密検査時に用いる気密検査検査治具（２０）の装着用の係止部として利用することにより、気密検査検査治具（２０）の熱交換器（１０）への装着作業を容易化できる利点もある。
【００２０】
なお、上記各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。
【００２１】
【発明の実施の形態】
以下本発明の一実施形態を図に基づいて説明する。本実施形態は車両空調用蒸発器に関するものであり、図１〜図３は車両空調用蒸発器の全体構造を示すもので、図４〜図６は図１〜図３の要部拡大図であり、図７は図４のＡ−Ａ断面図で、図８は図４のＢ−Ｂ断面図である。
【００２２】
車両空調用蒸発器１０は、上下方向に延びる偏平状のチューブ１１とコルゲートフィン１２とを交互に左右方向に積層配置した積層構造からなる熱交換コア部１３を備えている。この熱交換コア部１３を図２、３のＣ方向（図１の紙面垂直方向）に空調空気が送風されるようになっている。
【００２３】
熱交換コア部１３の上下両側にはタンク部１４、１５が配置され、この上下両側のタンク部１４、１５にチューブ１１の上下両端部が接合され、且つ、各チューブ１１内の冷媒通路がタンク部１４、１５内部の冷媒通路と連通している。タンク部１４、１５内部の冷媒通路は複数のチューブ１１内の冷媒通路に対する冷媒の分配あるいは複数のチューブ１１内の冷媒通路から流出する冷媒を集合する役割を果たす。
【００２４】
なお、本例では、上下両側のタンク部１４、１５が風上側タンク部１４ａ、１５ａと風下側タンク部１４ｂ、１５ｂとに分割され、これに伴って、チューブ１１内の冷媒通路も風上側冷媒通路と風下側冷媒通路とに分割されている。このチューブ１１内の冷媒通路とタンク部１４、１５内の冷媒通路は、所定の流れパターンにて一連の冷媒通路を形成する。
【００２５】
この一連の冷媒通路の冷媒出入口を形成する冷媒出入口部材１６を上側タンク部１４の一方の側面部に配置し、接合している。この冷媒出入口部材１６は前述の図１２の従来技術の同様のものであり、２枚の板材１６ａ、１６ｂを最中状に接合して構成される。
【００２６】
この板材１６ａ、１６ｂは、アルミニウム合金を芯材とし、この芯材の両面にアルミニウムろう材をクラッドした両面クラッド材をプレス成形したものである。板材１６ａ、１６ｂには冷媒入口通路部１６ｃと冷媒出口通路部１６ｄが形成され、この冷媒入口通路部１６ｃは上記一連の冷媒通路の冷媒入口部に接続され、冷媒出口通路部１６ｄは上記一連の冷媒通路の冷媒出口部に接続される。
【００２７】
図９は後述の補助嵌合部材１７（図１０）を接合する前の冷媒出入口部材１６の端面形状、すなわち、図４から補助嵌合部材１７を取り外した状態における冷媒出入口部材１６を示す。図９に示すように、冷媒入口通路部１６ｃの端部に、２枚の板材１６ａ、１６ｂの半円筒状部１６ｅ、１６ｆの組み合わせからなる入口側円筒状嵌合部１６ｉを形成している。また、冷媒出口通路部１６ｄの端部に、別の半円筒状部１６ｇ、１６ｈの組み合わせからなる出口側円筒状嵌合部１６ｊを形成している。
【００２８】
この２つの円筒状嵌合部１６ｉ、１６ｊ内に補助嵌合部材１７を嵌合して接合するようになっている。
【００２９】
図１０はこの補助嵌合部材１７を示すものであり、補助嵌合部材１７は、１枚の板材の板面から第１、第２円筒部１７ａ、１７ｂが垂直方向に突き出すように板材をプレス成形したものである。ここで、第１円筒部１７ａは冷媒出入口部材１６の入口側円筒状嵌合部１６ｉ内に挿入され、接合されるものである。また、第２円筒部１７ｂは冷媒出入口部材１６の出口側円筒状嵌合部１６ｊ内に挿入され、接合されるものである。
【００３０】
なお、補助嵌合部材１７構成する板材は、アルミニウム合金を芯材とし、この芯材の片面にアルミニウムろう材をクラッドした片面クラッド材である。ここで、片側のろう材クラッド面は、第１、第２円筒部１７ａ、１７ｂの外周側の面である。
【００３１】
また、補助嵌合部材１７には第１、第２円筒部１７ａ、１７ｂの根元部の板面から第１、第２円筒部１７ａ、１７ｂの突出方向と同一方向に突き出す係止爪部１７ｃ、１７ｄが形成してある。この係止爪部１７ｃ、１７ｄは図１０の例ではそれぞれ２個ずつ形成してある。
【００３２】
更に、補助嵌合部材１７において、第１円筒部１７ａと第２円筒部１７ｂとの中間部位に、係止爪部１７ｃ、１７ｄと同一方向に突き出す係止爪部１７ｅが形成してある。この係止爪部１７ｅは後述の図１１の気密検査治具２０を係止するためのものである。
【００３３】
図８は第１円筒部１７ａの係止爪部１７ｃの断面形状を示しており、係止爪部１７ｃは第１円筒部１７ａの根元部にＵ状の折り曲げ形状を形成し、このＵ状の折り曲げ形状の内側に、冷媒出入口部材１６の入口側円筒状嵌合部１６ｉを構成する半円筒状部１６ｅ、１６ｆの端面を挟み込むようになっている。そして、半円筒状部１６ｅ、１６ｆの外周面において、係止爪部１７ｃの先端部に対応する部位には凹部１６ｋが形成してあり、この凹部１６ｋ内に係止爪部１７ｃの先端部を係止する。
【００３４】
これにより、蒸発器１０を一体ろう付けする前の蒸発器組立状態において、冷媒出入口部材１６を構成する２枚の板材１６ａ、１６ｂの半円筒状部１６ｅ、１６ｆを確実に密着した状態で仮固定できる。
【００３５】
第２円筒部１７ｂの係止爪部１７ｄも上記第１円筒部１７ａの係止爪部１７ｃと同一の断面形状であるので、係止爪部１７ｄの断面図示を省略している。係止爪部１７ｄも第２円筒部１７ｂの根元部にＵ状の折り曲げ形状を形成して、このＵ状の折り曲げ形状の内側に冷媒出入口部材１６の出口側円筒状嵌合部１６ｊを構成する半円筒状部１６ｇ、１６ｈの端面を挟み込み、係止することにより、この半円筒状部１６ｇ、１６ｈを確実に密着した状態で仮固定できる。
【００３６】
そして、第１円筒部１７ａの内周に冷媒導入用配管１８を挿入して接合し、第２円筒部１７ｂの内周に冷媒導出用配管１９を挿入して接合するようになっている。なお、図１、図４は冷媒導入用配管１８および冷媒導出用配管１９を組み付ける前の状態を示している。
【００３７】
また、チューブ１１、コルゲートフィン１２、およびタンク１４、１５等の部品もすべてアルミニウム合金で形成され、後述の一体ろう付けにより蒸発器１０を組み付けできるようになっている。配管１８、１９もアルミニウム合金で形成されている。
【００３８】
次に、本実施形態における蒸発器１０の製造方法を説明すると、最初に、蒸発器１０の各部品を図１に示す状態に組み立てる組立工程を行う。この組立工程では、チューブ１１とコルゲートフィン１２とを交互に積層してコア部１３を構成し、チューブ１１の両端部には上下のタンク１４、１５を組み付ける。そして、２枚の板材１６ａ、１６ｂの組み合わせから構成される冷媒出入口部材１６を上側タンク部１４の一方の側面部に組み付ける。
【００３９】
更に、冷媒出入口部材１６に補助嵌合部材１７を組み付ける。すなわち、冷媒出入口部材１６の入口側円筒状嵌合部１６ｉ内に補助嵌合部材１７の第１円筒部１７ａを挿入し、また、出口側円筒状嵌合部１６ｊ内に第２円筒部１７ｂを挿入する。
【００４０】
以上のように、冷媒出入口部材１６に補助嵌合部材１７を組み付けた状態（図１の状態）で、蒸発器１０の組立工程を終了し、この組立体を金属ワイヤ等の適宜の治具にて拘束して、組立体の組付状態を維持する。
【００４１】
この後に、蒸発器１０の組立体のろう付け工程を行う。具体的には、蒸発器１０の組立体をろう付け用加熱炉内に搬入して、蒸発器１０の各部のろう材、例えば、チューブ１１、タンク１４、１５、板材１６ａ、１６ｂ、補助嵌合部材１７等のろう材の融点より高い温度まで組立体を加熱しろう材を溶融させる。
【００４２】
そして、蒸発器１０の組立体の加熱状態を所定時間維持した後、蒸発器１０の組立体をろう付け用加熱炉の外部へ取り出し冷却することにより、組立体各部の接合箇所を一体ろう付けすることができる。これにより、蒸発器１０を一体の組付状態に接合できる。
【００４３】
ところで、入口側円筒状嵌合部１６ｉおよび出口側円筒状嵌合部１６ｊがそれぞれ半円筒状部１０ｅ、１０ｆ、半円筒状部１６ｇ、１６ｈの組み合わせで構成されていても、本実施形態によると、半円筒状部１０ｅ、１０ｆの内側に補助嵌合部材１７の第１円筒部１７ａを挿入し、また、半円筒状部１６ｇ、１６ｈの内側には補助嵌合部材１７の第２円筒部１７ｂを挿入し、それぞれ一体ろう付けを行うから、半円筒状部１６ｇ、１６ｈのろう付け接合面および半円筒状部１６ｇ、１６ｈのろう付け接合面をそれぞれ第１、第２円筒部１７ａ、１７ｂにより確実に密封できる。
【００４４】
従って、配管１８、１９をろう付けする前の、図１の組付状態にて、蒸発器組立構造の気密検査を実施することが可能となる。
【００４５】
そこで、本実施形態では、蒸発器組立構造を一体ろう付けしただけで、配管１８、１９をろう付けする前に蒸発器も気密検査を実施する。図１１（ａ）は蒸発器１０の冷媒出入口部材１６と、この部材１６に装着される気密検査治具２０とを示し、図１１（ｂ）は、気密検査治具２０の底面図を示す。
【００４６】
気密検査治具２０は、冷媒出入口部材１６を通して蒸発器１０の内部冷媒通路（チューブ１１、タンク１４、１５等）内に検査流体（例えば、窒素ガス）を所定圧力でもって充填するためのものである。なお、蒸発器１０の気密検査は、図示しない真空に近い極低圧の状態に維持可能な真空検査室（図示せず）内に蒸発器１０を搬入し、この真空検査室内にて蒸発器１０の内部冷媒通路内に気密検査治具２０により検査流体を充填して、真空検査室内へ検査流体が洩れたか否かを判定するものである。
【００４７】
気密検査治具２０には、冷媒出入口部材１６にろう付けされた補助嵌合部材１７の第１円筒部１７ａおよび第２円筒部１７ｂの内側に挿入される第１、第２パイプ状部２１、２２を備えている。
【００４８】
この第１、第２パイプ状部２１、２２にはそれぞれゴム製のＯリング２１ａ、２２ａが設けてある。従って、第１、第２円筒部１７ａ、１７ｂ内へ第１、第２パイプ状部２１、２２を挿入したときに、Ｏリング２１ａ、２２ａが第１、第２パイプ状部２１、２２の内周面（シール面）に弾性的に圧着することにより、第１、第２円筒部１７ａ、１７ｂと第１、第２パイプ状部２１、２２との間をシールできる。従って、気密検査治具２０から検査流体を蒸発器１０の外部へ洩らすことなく、蒸発器１０の内部冷媒通路に確実に充填できる。
【００４９】
更に、補助嵌合部材１７に形成した係止爪部１７ｃ、１７ｄ、１７ｅを利用して、気密検査治具２０を蒸発器１０の冷媒出入口部材１６部分にワンタッチ操作にて簡単に装着できるようにしている。
【００５０】
すなわち、気密検査治具２０には、係止爪部１７ｃに対応した第１引っ掛け部材２３、係止爪部１７ｄに対応した第２引っ掛け部材２４、および係止爪部１７ｅに対応した第３引っ掛け部材２５が備えられている。
【００５１】
この第１〜第３引っ掛け部材２３〜２５はすべて同一構成であるので、図１１（ｂ）に図示される第１引っ掛け部材２３を例にとって具体的に説明すると、第１引っ掛け部材２３は第１パイプ状部２１の両側に配置された一対の部材であり、この一対の第１引っ掛け部材２３は気密検査治具２０の本体部２６に対して図示しないばね手段により矢印ａのように外側方向へ変位可能に支持されている。これにより、第１パイプ状部２１を第１円筒部１７ａ内に挿入すると同時に、第１引っ掛け部材２３の先端のＬ状の引っ掛け部２３ａが矢印ａのように外側方向へ広がるように変位して係止爪部１７ｃの部位を通過し、その後に、Ｌ状の引っ掛け部２３ａが係止爪部１７ｃと係止する。
【００５２】
同様に、第２引っ掛け部材２４の先端のＬ状の引っ掛け部２４ａおよび第３引っ掛け部材２５の先端のＬ状の引っ掛け部２５ａも、それぞれ、係止爪部１７ｄ、１７ｅに係止できる。
【００５３】
つまり、気密検査治具２０の第１、第２パイプ状部２１、２２を、補助嵌合部材１７の第１、第２円筒部１７ａ、１７ｂの内側へ挿入すると同時に、気密検査治具２０の第１〜第３引っ掛け部材２３〜２５を補助嵌合部材１７の係止爪部１７ｃ、１７ｄ、１７ｅに係止して、気密検査治具２０を冷媒出入口部材１６部分にワンタッチ操作にて簡単に装着できる。
【００５４】
そして、気密検査治具２０の装着完了後に、上述のように検査流体を蒸発器１０の内部冷媒通路に充填して蒸発器１０の気密検査を行う。このように、冷媒出入口部材１６に配管１８、１９を接合する前に気密検査を行うから、気密検査のための前述の真空検査室を小型化できる。
【００５５】
上述の気密検査を終了した後に、配管１８、１９を冷媒出入口部材１６の補助嵌合部材１７の第１、第２円筒部１７ａ、１７ｂにろう付けする配管ろう付け工程を行う。具体的には、配管１８、１９の先端部を第１、第２円筒部１７ａ、１７ｂの内側に挿入し、配管１８、１９と第１、第２円筒部１７ａ、１７ｂとの嵌合部に外部から作業者の手作業にてろう材を供給して、手作業によるろう付け方法にて配管１８、１９の先端部を第１、第２円筒部１７ａ、１７ｂにろう付けする。これにより、蒸発器１０の冷媒出入口部材１６に配管１８、１９が一体に接合された状態となり、蒸発器１０の全体構造を完成できる。
【００５６】
（他の実施形態）
なお、上記の一実施形態では、本発明を車両空調用蒸発器１０に適用した例について説明したが、本発明は車両空調用蒸発器１０に限定されることなく、種々な流体の熱交換を行う熱交換器一般に広く適用できるものである。
【図面の簡単な説明】
【図１】本発明の一実施形態による車両空調用蒸発器の正面図であり、冷媒入出用の配管を接合する前の状態を示す。
【図２】図１の側面図で、冷媒入出用の配管を接合した後の状態を示す。
【図３】図１の平面図で、冷媒入出用の配管を接合した後の状態を示す。
【図４】図１の要部拡大図である。
【図５】図２の要部拡大図である。
【図６】図３の要部拡大図である。
【図７】図４のＡ−Ａ断面図である。
【図８】図４のＢ−Ｂ断面図である。
【図９】図４において補助嵌合部材を接合する前の状態を示す要部拡大正面図である。
【図１０】（ａ）は補助嵌合部材の正面図、（ｂ）は（ａ）のＤ−Ｄ断面図である。
【図１１】（ａ）は蒸発器への気密検査治具の装着過程の説明図、（ｂ）は気密検査治具の底面図である。
【図１２】（ａ）は従来の蒸発器の要部正面図で、冷媒入出用の配管を接合する前の状態を示す。（ｂ）は従来の蒸発器の要部側面図、（ｃ）は従来の蒸発器の要部平面図である。
【符号の説明】
１０…蒸発器、１１…チューブ（蒸発器内部通路）、
１４、１５…タンク（蒸発器内部通路）、１６…冷媒出入口部材、
１６ａ、１６ｂ…板材、１６ｃ…冷媒入口通路、１６ｄ…冷媒出口通路、
１６ｅ〜１６ｈ…半円筒状部、１６ｉ…入口側円筒状嵌合部、
１６ｊ…出口側円筒状嵌合部、１７…補助嵌合部材、
１７ａ、１７ｂ…第１、第２円筒部、１７ｃ、１７ｄ…係止爪部、
１８…冷媒導入用配管、１９…冷媒導出用配管。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint structure of a fluid inlet / outlet in a heat exchanger, and is suitable for use in an evaporator for vehicle air conditioning.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a heat exchanger such as an evaporator for vehicle air conditioning is provided with a fluid inlet / outlet member that forms a fluid inlet / outlet of a fluid flowing through the heat exchanger, and a fluid introduction pipe and a fluid outlet pipe are connected to the fluid inlet / outlet member. It is joined by attaching.
[0003]
Specifically, this pipe joining method includes (1) a method of brazing a pipe simultaneously with the integral brazing of the heat exchanger assembly structure, and (2) a brazing of the heat exchanger assembly structure, and thereafter The method is roughly divided into a method of separately brazing the piping parts separately.
[0004]
[Problems to be solved by the invention]
By the way, in the case of the heat exchanger for vehicles, the length of the piping part integrally joined to the heat exchanger is variously changed according to the variation for each vehicle type. Therefore, with the former method (1), the brazing equipment and the heat exchanger airtightness inspection device must be enlarged to accommodate the maximum length of piping among the variations for each vehicle type. Equipment costs are expensive.
[0005]
In the latter method (2), only the heat exchanger assembly structure is brazed together, so that the brazing equipment can be reduced in size because there is no piping portion. However, in the latter method (2), the air-tightness inspection facility for the heat exchanger must still be enlarged for the following reason.
[0006]
FIG. 12 shows a joining structure of a fluid inlet / outlet member 16, a fluid introduction pipe 18 and a fluid outlet pipe 19 in a conventional heat exchanger. In addition, illustration of the piping 18 and 19 is abbreviate | omitted in Fig.12 (a). The fluid inlet / outlet member 16 is formed by joining two press-molded plate members 16a and 16b in the middle. That is, by forming a bulging portion that bulges outward on one plate member 16a and joining it to the other plate member 16b, a fluid inlet passage portion 16c and a fluid outlet passage portion 16d are formed, and the inlet passage portion 16c An inlet-side cylindrical fitting portion 16i made of a combination of the semi-cylindrical portions 16e and 16f of the two plate members 16a and 16b is formed at the end portion. Similarly, an outlet side cylindrical fitting portion 16j made of a combination of other semi-cylindrical portions 16g and 16h is formed at the end of the outlet passage portion 16d.
[0007]
And the front-end | tip part of the pipe 18 for fluid introduction | transduction is inserted and brazed to the internal peripheral surface of the inlet side cylindrical fitting part 16i. Moreover, the front-end | tip part of the fluid extraction piping 19 is inserted and brazed to the internal peripheral surface of the exit side cylindrical fitting part 16j.
[0008]
By the way, the inlet-side cylindrical fitting portion 16i and the outlet-side cylindrical fitting portion 16j are each composed of a combination of the semicylindrical portions 10e and 10f and the semicylindrical portions 16g and 16h. If only brazing is performed integrally, the brazing joint surface of the semi-cylindrical portions 10e and 10f and the brazing joint surfaces of the semi-cylindrical portions 16g and 16h may cause melting of brazing filler metal during brazing, brazing material Due to factors such as the occurrence of voids (bubbles) in the fret part, fluid leaks occur, making it impossible to conduct an airtight inspection (leakage inspection) of the heat exchanger assembly structure.
[0009]
Therefore, after the heat exchanger assembly structure is integrally brazed, the end portions of the pipes 18 and 19 are inserted into the inner peripheral surfaces of the cylindrical fitting portions 16i and 16j and brazed, and this pipe brazing is performed. The brazed joint surfaces of the semi-cylindrical portions 10e to 16h are securely sealed, and thereafter, an airtight inspection (leakage inspection) of the heat exchanger assembly structure is performed.
[0010]
Therefore, since the airtight inspection is performed after the size of the heat exchanger is increased by joining the pipes 18 and 19, the airtight inspection facility is increased in size.
[0011]
In view of the above points, the present invention provides a pipe joint structure in a heat exchanger that can cope with various lengths of pipe variations without increasing the size of brazing equipment and close inspection equipment for heat exchangers. The purpose is to do.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, in the fluid inlet / outlet member (16) formed by joining two plate members (16a, 16b), the fluid passage (11, 14, 15) forming a fluid inlet passage (16 c) communicating with the inlet portion and a fluid outlet passage (16 d) communicating with the outlet portion of the fluid passage (11, 14, 15). An inlet side cylindrical fitting portion (16i) comprising a combination of semi-cylindrical portions (16e, 16f) of two plate materials (16a, 16b) is formed, and two plate materials (16d) are formed in the fluid outlet passage (16d). 16a, 16b) forming an outlet side cylindrical fitting portion (16j) composed of a combination of semicylindrical portions (16g, 16h),
Further, the first cylindrical portion (17a) inserted and joined in the inlet side cylindrical fitting portion (16i) and the second cylinder inserted and joined in the outlet side cylindrical fitting portion (16j). An auxiliary fitting member (17) having a portion (17b),
The auxiliary fitting member (17) is formed into a shape having a first cylindrical portion (17a) and a second cylindrical portion (17b) from one plate material,
The auxiliary fitting member (17) protrudes in the same direction as the protruding direction of the first and second cylindrical portions (17a, 17b) at an intermediate portion between the first cylindrical portion (17a) and the second cylindrical portion (17b). A locking claw portion (17e) for locking the airtightness inspection jig (20) is formed,
The fluid introduction pipe (18) is inserted and joined in the first cylindrical part (17a), and the fluid outlet pipe (19) is inserted and joined in the second cylindrical part (17b). To do.
[0013]
According to this, at the stage before joining of the fluid inlet / outlet pipes (18, 19), the inlet side cylindrical fitting portion formed by the combination of the semi-cylindrical portions (16e, 16f) of the two plate members (16a, 16b). (16i) and the outlet-side cylindrical fitting portion (16j) formed by the combination of the semi-cylindrical portions (16g, 16h) of the two plate members (16a, 16b) are respectively connected to the auxiliary fitting members (17). 1. It can join airtightly by interposition of the 2nd cylindrical part (17a, 17b).
[0014]
Therefore, in a state where only the heat exchanger assembly structure is brazed, that is, in a heat exchanger brazed state before joining the fluid inlet / outlet pipes (18, 19), an airtight inspection for the fluid passage inside the heat exchanger is performed. It can be performed. Therefore, it is possible to reduce the size of the brazing equipment and the airtightness inspection equipment by the amount not joined to the fluid inlet / outlet pipes (18, 19), and to reduce the cost of the heat exchanger manufacturing equipment. In addition, the installation space for manufacturing equipment in the factory can be reduced.
[0015]
Then, after completing the integral brazing and airtightness inspection of the heat exchanger, pipes (18, 19) of various lengths are placed in the first and second cylindrical portions (17a, 17b) of the auxiliary fitting member (17). By inserting and joining, it is possible to cope with various piping variations.
[0016]
And in invention of Claim 1 , an auxiliary fitting member (17) has a 1st cylindrical part (17a) , a 2nd cylindrical part (17b), and a latching claw part (17e) from one board | plate material. It can be efficiently formed into a shape.
[0017]
According to a second aspect of the present invention, in the first aspect , the auxiliary fitting member (17) protrudes in the same direction as the protruding direction of the first and second cylindrical portions (17a, 17b) to form two plate members (16a). , 16b) is formed with another locking claw portion (17c, 17d) for temporarily fixing the combined state of the semi-cylindrical portions (16e, 16f, 16g, 16h).
[0018]
Thereby, the combined state of the semi-cylindrical portions (16e, 16f, 16g, 16h) of the two plate members (16a, 16b) by the other locking claws (17c, 17d) of the auxiliary fitting member (17). It is possible to perform brazing in a state in which the joint surfaces between the semicylindrical portions (16e, 16f, 16g, 16h) are reliably brought into contact with each other by being temporarily fixed. As a result, it is possible to improve the brazing property of the joint surface between the semicylindrical parts (16e, 16f, 16g, 16h).
[0019]
Further, in addition to the locking claw portion (17e) in the invention of claim 1, another locking claw portion (17c, 17d) of the auxiliary fitting member (17) is also used for the airtight inspection inspection treatment. By using it as a locking part for mounting the tool (20), there is also an advantage that the mounting work of the airtight inspection inspection jig (20) to the heat exchanger (10) can be facilitated.
[0020]
In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. This embodiment relates to a vehicular air-conditioning evaporator, FIGS. 1 to 3 show the overall structure of the vehicular air-conditioning evaporator, and FIGS. 4 to 6 are enlarged views of main parts of FIGS. 7 is a cross-sectional view taken along line AA in FIG. 4, and FIG. 8 is a cross-sectional view taken along line BB in FIG.
[0022]
The vehicle air conditioner evaporator 10 includes a heat exchange core portion 13 having a laminated structure in which flat tubes 11 and corrugated fins 12 extending in the vertical direction are alternately stacked in the horizontal direction. Air-conditioned air is blown through the heat exchanging core 13 in the direction C in FIGS. 2 and 3 (the direction perpendicular to the plane of FIG. 1).
[0023]
Tank portions 14 and 15 are arranged on both upper and lower sides of the heat exchange core portion 13, and upper and lower end portions of the tubes 11 are joined to the tank portions 14 and 15 on both upper and lower sides, and the refrigerant passages in the respective tubes 11 serve as tanks. The portions 14 and 15 communicate with the refrigerant passage inside. The refrigerant passages in the tank portions 14 and 15 serve to distribute refrigerant to the refrigerant passages in the plurality of tubes 11 or to collect refrigerant flowing out from the refrigerant passages in the plurality of tubes 11.
[0024]
In this example, the upper and lower tank parts 14 and 15 are divided into the windward tank parts 14a and 15a and the leeward tank parts 14b and 15b, and accordingly, the refrigerant passage in the tube 11 is also in the windward refrigerant. It is divided into a passage and a leeward refrigerant passage. The refrigerant passage in the tube 11 and the refrigerant passages in the tank portions 14 and 15 form a series of refrigerant passages in a predetermined flow pattern.
[0025]
A refrigerant inlet / outlet member 16 that forms the refrigerant inlet / outlet of the series of refrigerant passages is disposed on one side surface portion of the upper tank portion 14 and joined thereto. This refrigerant inlet / outlet member 16 is the same as that of the prior art of FIG. 12, and is formed by joining two plate members 16a and 16b in the middle.
[0026]
The plate members 16a and 16b are formed by press-molding a double-sided clad material in which an aluminum alloy is used as a core material and an aluminum brazing material is clad on both surfaces of the core material. The plate members 16a and 16b are formed with a refrigerant inlet passage portion 16c and a refrigerant outlet passage portion 16d. The refrigerant inlet passage portion 16c is connected to the refrigerant inlet portion of the series of refrigerant passages, and the refrigerant outlet passage portion 16d is connected to the series of refrigerants. Connected to the refrigerant outlet of the refrigerant passage.
[0027]
FIG. 9 shows the shape of the end face of the refrigerant inlet / outlet member 16 before joining an auxiliary fitting member 17 (FIG. 10), that is, the refrigerant inlet / outlet member 16 in a state where the auxiliary fitting member 17 is removed from FIG. As shown in FIG. 9, the inlet side cylindrical fitting part 16i which consists of the combination of the semi-cylindrical parts 16e and 16f of the two board | plate materials 16a and 16b is formed in the edge part of the refrigerant | coolant inlet channel part 16c. Further, an outlet-side cylindrical fitting portion 16j made of a combination of other semi-cylindrical portions 16g and 16h is formed at the end of the refrigerant outlet passage portion 16d.
[0028]
The auxiliary fitting member 17 is fitted and joined in the two cylindrical fitting portions 16i and 16j.
[0029]
FIG. 10 shows the auxiliary fitting member 17, which presses the plate material so that the first and second cylindrical portions 17a and 17b protrude in the vertical direction from the plate surface of one plate material. Molded. Here, the first cylindrical portion 17 a is inserted into and joined to the inlet side cylindrical fitting portion 16 i of the refrigerant inlet / outlet member 16. The second cylindrical portion 17b is inserted into and joined to the outlet side cylindrical fitting portion 16j of the refrigerant inlet / outlet member 16.
[0030]
The plate material constituting the auxiliary fitting member 17 is a single-side clad material in which an aluminum alloy is used as a core material and an aluminum brazing material is clad on one surface of the core material. Here, the brazing material clad surface on one side is the outer peripheral surface of the first and second cylindrical portions 17a, 17b.
[0031]
Further, the auxiliary fitting member 17 has a locking claw portion 17c protruding in the same direction as the protruding direction of the first and second cylindrical portions 17a and 17b from the plate surface of the base portion of the first and second cylindrical portions 17a and 17b. 17d is formed. In the example of FIG. 10, two each of the locking claws 17c and 17d are formed.
[0032]
Further, in the auxiliary fitting member 17, a locking claw portion 17e protruding in the same direction as the locking claw portions 17c and 17d is formed at an intermediate portion between the first cylindrical portion 17a and the second cylindrical portion 17b. The locking claw portion 17e is for locking an airtight inspection jig 20 shown in FIG.
[0033]
FIG. 8 shows a cross-sectional shape of the locking claw portion 17c of the first cylindrical portion 17a. The locking claw portion 17c forms a U-shaped bent shape at the root portion of the first cylindrical portion 17a. The end surfaces of the semicylindrical portions 16e and 16f constituting the inlet side cylindrical fitting portion 16i of the refrigerant inlet / outlet member 16 are sandwiched inside the bent shape. And in the outer peripheral surface of semi-cylindrical part 16e, 16f, the recessed part 16k is formed in the site | part corresponding to the front-end | tip part of the latching claw part 17c, and the front-end | tip part of the latching claw part 17c is formed in this recessed part 16k. Lock.
[0034]
Thereby, in the evaporator assembly state before the evaporator 10 is integrally brazed, the semi-cylindrical portions 16e and 16f of the two plate members 16a and 16b constituting the refrigerant inlet / outlet member 16 are temporarily fixed in a state of being in close contact with each other. it can.
[0035]
Since the locking claw portion 17d of the second cylindrical portion 17b has the same cross-sectional shape as the locking claw portion 17c of the first cylindrical portion 17a, the sectional illustration of the locking claw portion 17d is omitted. The locking claw portion 17d also has a U-shaped bent shape at the base portion of the second cylindrical portion 17b, and the outlet side cylindrical fitting portion 16j of the refrigerant inlet / outlet member 16 is formed inside the U-shaped bent shape. By sandwiching and locking the end surfaces of the semicylindrical portions 16g and 16h, the semicylindrical portions 16g and 16h can be temporarily fixed in a state of being in close contact with each other.
[0036]
Then, the refrigerant introduction pipe 18 is inserted and joined to the inner periphery of the first cylindrical part 17a, and the refrigerant outlet pipe 19 is inserted and joined to the inner circumference of the second cylindrical part 17b. 1 and 4 show a state before the refrigerant introduction pipe 18 and the refrigerant outlet pipe 19 are assembled.
[0037]
Further, the parts such as the tube 11, the corrugated fins 12, and the tanks 14 and 15 are all formed of an aluminum alloy, and the evaporator 10 can be assembled by integral brazing described later. The pipes 18 and 19 are also formed of an aluminum alloy.
[0038]
Next, the manufacturing method of the evaporator 10 in the present embodiment will be described. First, an assembly process for assembling each component of the evaporator 10 into the state shown in FIG. 1 is performed. In this assembly process, the tubes 11 and the corrugated fins 12 are alternately stacked to form the core portion 13, and the upper and lower tanks 14 and 15 are assembled to both ends of the tube 11. Then, the refrigerant inlet / outlet member 16 composed of a combination of the two plate members 16 a and 16 b is assembled to one side surface portion of the upper tank portion 14.
[0039]
Further, the auxiliary fitting member 17 is assembled to the refrigerant inlet / outlet member 16. That is, the first cylindrical portion 17a of the auxiliary fitting member 17 is inserted into the inlet side cylindrical fitting portion 16i of the refrigerant inlet / outlet member 16, and the second cylindrical portion 17b is inserted into the outlet side cylindrical fitting portion 16j. insert.
[0040]
As described above, in the state where the auxiliary fitting member 17 is assembled to the refrigerant inlet / outlet member 16 (the state shown in FIG. 1), the assembly process of the evaporator 10 is completed, and this assembly is used as an appropriate jig such as a metal wire. To maintain the assembled state of the assembly.
[0041]
Thereafter, a brazing step of the assembly of the evaporator 10 is performed. Specifically, the assembly of the evaporator 10 is carried into a brazing heating furnace, and brazing materials of each part of the evaporator 10, such as tubes 11, tanks 14 and 15, plate materials 16a and 16b, auxiliary fittings. The assembly is heated to a temperature higher than the melting point of the brazing material such as the member 17 to melt the brazing material.
[0042]
Then, after maintaining the heating state of the assembly of the evaporator 10 for a predetermined time, the assembly of the evaporator 10 is taken out of the heating furnace for brazing and cooled, thereby integrally brazing the joints of each part of the assembly. be able to. Thereby, the evaporator 10 can be joined to an integrated assembly state.
[0043]
By the way, even if the inlet side cylindrical fitting portion 16i and the outlet side cylindrical fitting portion 16j are each composed of a combination of the semicylindrical portions 10e and 10f and the semicylindrical portions 16g and 16h, according to the present embodiment. The first cylindrical portion 17a of the auxiliary fitting member 17 is inserted inside the semicylindrical portions 10e and 10f, and the second cylindrical portion 17b of the auxiliary fitting member 17 is inserted inside the semicylindrical portions 16g and 16h. Are inserted and brazed together, so that the brazed joint surfaces of the semicylindrical portions 16g and 16h and the brazed joint surfaces of the semicylindrical portions 16g and 16h are respectively formed by the first and second cylindrical portions 17a and 17b. It can be reliably sealed.
[0044]
Therefore, it is possible to carry out an airtight inspection of the evaporator assembly structure in the assembled state of FIG. 1 before the pipes 18 and 19 are brazed.
[0045]
Therefore, in the present embodiment, the evaporator assembly structure is simply brazed together, and the evaporator is also subjected to an airtight inspection before the pipes 18 and 19 are brazed. FIG. 11A shows the refrigerant inlet / outlet member 16 of the evaporator 10 and the airtight inspection jig 20 attached to the member 16, and FIG. 11B shows a bottom view of the airtight inspection jig 20.
[0046]
The airtight inspection jig 20 is used to fill the internal refrigerant passage (tube 11, tanks 14, 15, etc.) of the evaporator 10 through the refrigerant inlet / outlet member 16 with a predetermined pressure (for example, nitrogen gas). is there. In the airtight inspection of the evaporator 10, the evaporator 10 is carried into a vacuum inspection chamber (not shown) that can be maintained at an extremely low pressure close to a vacuum (not shown). The internal coolant passage is filled with the inspection fluid by the airtight inspection jig 20, and it is determined whether or not the inspection fluid has leaked into the vacuum inspection chamber.
[0047]
The airtight inspection jig 20 includes first and second pipe-like portions 21 inserted inside the first cylindrical portion 17a and the second cylindrical portion 17b of the auxiliary fitting member 17 brazed to the refrigerant inlet / outlet member 16. 22 is provided.
[0048]
The first and second pipe-like portions 21 and 22 are provided with rubber O-rings 21a and 22a, respectively. Accordingly, when the first and second pipe-like portions 21 and 22 are inserted into the first and second cylindrical portions 17a and 17b, the O-rings 21a and 22a are inside the first and second pipe-like portions 21 and 22, respectively. The space between the first and second cylindrical portions 17a and 17b and the first and second pipe-shaped portions 21 and 22 can be sealed by elastically pressing the peripheral surface (seal surface). Therefore, the internal coolant passage of the evaporator 10 can be reliably filled without leaking the inspection fluid from the airtight inspection jig 20 to the outside of the evaporator 10.
[0049]
Further, by using the locking claws 17c, 17d, and 17e formed on the auxiliary fitting member 17, the airtight inspection jig 20 can be easily attached to the refrigerant inlet / outlet member 16 portion of the evaporator 10 by a one-touch operation. ing.
[0050]
That is, the airtight inspection jig 20 includes a first hook member 23 corresponding to the locking claw portion 17c, a second hook member 24 corresponding to the locking claw portion 17d, and a third hook corresponding to the locking claw portion 17e. A member 25 is provided.
[0051]
Since the first to third hook members 23 to 25 all have the same configuration, the first hook member 23 will be described in detail by taking the first hook member 23 shown in FIG. 11B as an example. A pair of members disposed on both sides of the pipe-shaped portion 21, and the pair of first hook members 23 are moved outward as indicated by an arrow a by spring means (not shown) with respect to the body portion 26 of the airtightness inspection jig 20. It is supported so that it can be displaced. As a result, the first pipe-shaped portion 21 is inserted into the first cylindrical portion 17a, and at the same time, the L-shaped hook portion 23a at the tip of the first hook member 23 is displaced so as to spread outward as indicated by an arrow a. After passing through the portion of the locking claw portion 17c, the L-shaped hook portion 23a is locked with the locking claw portion 17c.
[0052]
Similarly, the L-shaped hook portion 24a at the tip of the second hook member 24 and the L-shaped hook portion 25a at the tip of the third hook member 25 can also be locked to the locking claws 17d and 17e, respectively.
[0053]
That is, the first and second pipe-like portions 21 and 22 of the airtight inspection jig 20 are inserted into the first and second cylindrical portions 17a and 17b of the auxiliary fitting member 17, and at the same time, The first to third hook members 23 to 25 are locked to the locking claws 17c, 17d and 17e of the auxiliary fitting member 17, and the airtight inspection jig 20 can be easily operated on the refrigerant inlet / outlet member 16 portion by a one-touch operation. Can be installed.
[0054]
Then, after the installation of the airtight inspection jig 20 is completed, the internal fluid passage of the evaporator 10 is filled with the inspection fluid as described above, and the airtight inspection of the evaporator 10 is performed. Thus, since the airtight inspection is performed before the pipes 18 and 19 are joined to the refrigerant inlet / outlet member 16, the above-described vacuum inspection chamber for the airtight inspection can be reduced in size.
[0055]
After completing the above airtightness inspection, a pipe brazing process is performed in which the pipes 18 and 19 are brazed to the first and second cylindrical portions 17a and 17b of the auxiliary fitting member 17 of the refrigerant inlet / outlet member 16. Specifically, the tip ends of the pipes 18 and 19 are inserted inside the first and second cylindrical parts 17a and 17b, and the fitting parts between the pipes 18 and 19 and the first and second cylindrical parts 17a and 17b are inserted. The brazing material is supplied from the outside by the manual operation of the operator, and the tip portions of the pipes 18 and 19 are brazed to the first and second cylindrical portions 17a and 17b by a manual brazing method. Thereby, the pipes 18 and 19 are integrally joined to the refrigerant inlet / outlet member 16 of the evaporator 10, and the entire structure of the evaporator 10 can be completed.
[0056]
(Other embodiments)
In the above embodiment, the example in which the present invention is applied to the vehicle air conditioner evaporator 10 has been described. However, the present invention is not limited to the vehicle air conditioner evaporator 10, and heat exchange of various fluids can be performed. It can be widely applied to general heat exchangers.
[Brief description of the drawings]
FIG. 1 is a front view of a vehicular air conditioning evaporator according to an embodiment of the present invention, showing a state before joining refrigerant inlet / outlet piping.
FIG. 2 is a side view of FIG. 1 and shows a state after joining refrigerant piping.
FIG. 3 is a plan view of FIG. 1 and shows a state after joining refrigerant inlet / outlet piping.
FIG. 4 is an enlarged view of a main part of FIG. 1;
FIG. 5 is an enlarged view of a main part of FIG. 2;
6 is an enlarged view of a main part of FIG. 3. FIG.
7 is a cross-sectional view taken along the line AA in FIG.
8 is a cross-sectional view taken along the line BB in FIG.
FIG. 9 is an enlarged front view of a main part showing a state before the auxiliary fitting member is joined in FIG. 4;
10A is a front view of an auxiliary fitting member, and FIG. 10B is a cross-sectional view taken along line DD of FIG.
11A is an explanatory view of a process of mounting the airtightness inspection jig on the evaporator, and FIG. 11B is a bottom view of the airtightness inspection jig.
FIG. 12 (a) is a front view of a main part of a conventional evaporator, showing a state before joining a refrigerant inlet / outlet pipe. (B) is a principal part side view of the conventional evaporator, (c) is a principal part top view of the conventional evaporator.
[Explanation of symbols]
10 ... evaporator, 11 ... tube (evaporator internal passage),
14, 15 ... tank (evaporator internal passage), 16 ... refrigerant inlet / outlet member,
16a, 16b ... plate material, 16c ... refrigerant inlet passage, 16d ... refrigerant outlet passage,
16e-16h ... semi-cylindrical part, 16i ... inlet side cylindrical fitting part,
16j ... outlet side cylindrical fitting part, 17 ... auxiliary fitting member,
17a, 17b ... 1st, 2nd cylindrical part, 17c, 17d ... Locking claw part,
18 ... piping for introducing refrigerant, 19 ... piping for discharging refrigerant.

Claims

Fluid inlet passage (16c) communicating with the inlet portion of the fluid passage (11, 14, 15) inside the heat exchanger to the fluid inlet / outlet member (16) configured by joining two plates (16a, 16b) And a fluid outlet passage (16d) in communication with the outlet of the fluid passage (11, 14, 15),
The fluid inlet passage (16c) is formed with an inlet side cylindrical fitting portion (16i) comprising a combination of the semi-cylindrical portions (16e, 16f) of the two plate members (16a, 16b), and the fluid outlet An outlet side cylindrical fitting portion (16j) formed of a combination of the semi-cylindrical portions (16g, 16h) of the two plate members (16a, 16b) is formed in the passage (16d),
Further, the first cylindrical portion (17a) inserted and joined into the inlet side cylindrical fitting portion (16i), and the first cylindrical portion (16j) inserted and joined into the outlet side cylindrical fitting portion (16j). An auxiliary fitting member (17) having two cylindrical portions (17b);
The auxiliary fitting member (17) is formed into a shape having the first cylindrical portion (17a) and the second cylindrical portion (17b) from one plate material,
The auxiliary fitting member (17) includes a protruding direction of the first and second cylindrical portions (17a, 17b) at an intermediate portion between the first cylindrical portion (17a) and the second cylindrical portion (17b). A locking claw portion (17e) that protrudes in the same direction and locks the airtightness inspection jig (20) is formed,
Inserting and joining the fluid introduction pipe (18) in the first cylindrical part (17a) and inserting and joining the fluid outlet pipe (19) in the second cylindrical part (17b). A pipe joint structure in a heat exchanger.

The auxiliary fitting member (17) protrudes in the same direction as the protruding direction of the first and second cylindrical portions (17a, 17b), and the semi-cylindrical portion (16e, 16b) of the two plate members (16a, 16b). 16. The pipe joint structure in a heat exchanger according to claim 1 , wherein another locking claw portion (17 c, 17 d) for temporarily fixing the combined state of 16 f, 16 g, 16 h) is formed .