JP4585682B2 - Tube for heat exchanger - Google Patents

Tube for heat exchanger Download PDF

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Publication number
JP4585682B2
JP4585682B2 JP2000324539A JP2000324539A JP4585682B2 JP 4585682 B2 JP4585682 B2 JP 4585682B2 JP 2000324539 A JP2000324539 A JP 2000324539A JP 2000324539 A JP2000324539 A JP 2000324539A JP 4585682 B2 JP4585682 B2 JP 4585682B2
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flat tube
heat exchanger
tube
flat
partition wall
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JP2000324539A
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JP2002130971A (en
Inventor
加寿紀 北
広一朗 猪原
哲夫 ▲くわ▼森
勝秀 岡田
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Japan Climate Systems Corp
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Japan Climate Systems Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more conduits

Description

【０００１】
【発明の属する技術分野】
本発明は、車両用空調装置等の熱交換器に用いられる熱交換器用チューブに関する。
【０００２】
【従来の技術】
従来、例えば温水式暖房装置のヒーターコアに用いられる扁平チューブは、図９に示すように、電縫管と呼ばれるアルミ薄板材を幅方向略中央部でＵ字状に折り曲げ、更に幅方向両端部付近をＲ形状にチューブ内面方向に向かうように曲げ、この幅方向両端部の端面同士を当接させ、当接部を溶接したものを使用している。このような電縫管チューブ単体での短径寸法は、組立性を考慮して、Ｒ部付近より中央部付近が大きく形成されている。
【０００３】
熱交換器を組み立てる際、扁平チューブとフィンを扁平チューブ短径方向に積層した積層体（コア）を、短径方向に圧縮荷重を加え、圧縮する。この時、圧縮荷重により扁平チューブの短径寸法は、中央部付近とＲ部付近がほぼ同じとなり、向かい合う扁平チューブの長辺部は略平行に変形する。
【０００４】
圧縮したコアの扁平チューブの端面をヘッダーの挿入孔に差し込み、コア積層方向の圧縮荷重を開放すると、変形したチューブが元の形状に戻ろうとする力（反力）が発生する。
【０００５】
この反力が、扁平チューブと隣り合って積層されたフィンを保持する力となり、熱交換器の一体ロウ付け時において、熱交換器からのフィンの脱落を防止するように作用する。
【０００６】
ところで、近年、図１０に示すように、アルミ材を用いた熱交換器において、一般にフォルデッドチューブと呼ばれるアルミ薄板材を順次折り曲げて仕切部を形成し、チューブ断面形状が略θ状となるように成形し、熱交換媒体の流路を形成する扁平チューブが主流になりつつある。
【０００７】
【発明が解決しようとする課題】
しかしながら、このような断面略θ状の扁平チューブでは、通常Ｒ部付近の短径と中央付近の短径とはほぼ等しく形成されている。
【０００８】
例えば、扁平チューブの短径をＲ部付近よりも中央付近で大きくして形成すると、中柱部が踏ん張り、中央部付近の短径方向剛性が高くなるため、ヘッダ挿入時に変形し難く、ヘッダへの扁平チューブ挿入が困難となる。
【０００９】
そのために、通常扁平チューブの高さは、仕切壁の高さに合わせて一定に形成されている。この従来タイプでは、扁平チューブと隣り合って積層されたフィンの保持力が弱く、コアの搬送時やロウ付け時にコアからのフィン脱落が生じやすい。
【００１０】
本発明はこのような問題を解決するために、コアを組み立てた場合には、扁平チューブの弾性変形によりフィンが保持され、かつヘッダに対しては挿入し易い扁平チューブの形状を提供することを目的とする。
【００１１】
【課題を解決するための手段】
請求項１の発明では、板材を順次折り曲げて成形する略θ状断面を有する熱交換器用扁平チューブにおいて、上記略θ状断面の中央の仕切壁が弾性変形可能な形状に形成されている。また、上記扁平チューブが挿入されるヘッダチューブの挿入孔短径に対して、該扁平チューブの幅方向両端の折曲げ部であるＲ部付近の短径が小さく、且つ扁平チューブの中央部付近の短径が大きく形成されている。
【００１２】
この構成により、扁平チューブとフィンとを積層してコアを組み立てた場合、このコアを圧縮できるので、扁平チューブの端部をヘッダに容易に挿入でき、圧縮状態を解除すると、扁平チューブの復元力によりフィンが強固に保持される。しかも、ヘッダチューブの挿入孔短径に対し、扁平チューブの幅方向両端のＲ部付近の短径が小さく且つ中央部付近の短径が大きく形成されているので、組立時には圧縮することでヘッダに挿入し易くなり、圧縮を解除することでフィンの保持力に優れた構成とすることができる。
【００１３】
請求項２の発明では、請求項１記載の熱交換器用チューブにおいて、該仕切壁の断面形状が略円弧状に形成されているので、弾性変形し易く且つ復元性も良好であり、ヘッダと扁平チューブとの組立性及び一体ロウ付け性が大幅に向上する。
【００１４】
請求項３の発明では、請求項１または請求項２記載の熱交換器用チューブにおいて、該仕切壁の外周面にロウ材クラッドが設けられた構成であり、仕切壁と扁平チューブの平坦部とのロウ付け性が向上する。
【００１５】
請求項４の発明では、請求項３記載の熱交換器用チューブにおいて、熱交換器用扁平チューブが１枚の板材を折り曲げて形成されており、該板材の一方の端部が仕切壁を形成し、他方の端部が該一方の端部の折曲げ基部に接合されている構成であり、中柱部が一方の端部で形成されるので、この中柱部が弾性変形し易く復元性も良好であり、且つ材料コストを低減できる。
【００１６】
請求項５の発明では、請求項１ないし４のいずれか記載の熱交換器用チューブにおいて、該仕切壁が、断面略円弧状の中柱部と、その中柱部の先端に伸びて形成された先端部と、該中柱部の折曲げ基部とからなり、該先端部は扁平チューブ外周壁の平坦部の内周面に沿って伸び、該内周面にロウ付けされて形成され、該折曲げ基部は扁平チューブの他方の端部を受ける受段部を有する構成であるので、該仕切壁と両平坦部とのロウ付け強度が優れている。
【００１７】
請求項６の発明では、請求項４または５記載の熱交換器用チューブにおいて、該折曲げ基部が、該平坦部と平行な平行面部とこの平行面部と略直角な直角面部とを有し、該扁平チューブの該他方の端部は、該直角面部と対向する対向面部と内側に傾斜面部を有する構成であり、該折曲げ基部に該他方の端部を組み立てた際に、お互いの隙間を小さく形成できるので、ロウ付け性が向上する。
【００１８】
【発明の実施の形態】
本発明を、図１に示す実施例に基づいて説明する。図１は本発明に係る熱交換器１０を示す。扁平チューブ１１とフィン１２とが積層され、その両側部にエンドプレート１３が配置されている。扁平チューブ１１とフィン１２からなるコアは上下のヘッダ１４の挿入孔１４ａ（図４参照）に挿入されて一体ロウ付けされている。上方のヘッダ１４にコネクタタンク１５が接続され、このコネクタタンク１５にパイプ１６が連通されている。下方のヘッダ１４にはリターンタンク１７が接続されている。
【００１９】
図２は、扁平チューブ１１の断面形状を示し、図３はこの扁平チューブ１１の中央部付近の拡大断面図を示す。扁平チューブ１１は断面略θ形状のアルミ製の１枚の薄板からなる。この薄板の両端部を略Ｕ字状に折り曲げ、一方の端部１１ａで仕切壁２１を形成し、他方の端部１１ｂをこの仕切壁２１に当接接合している。仕切壁２１には、扁平チューブ１１の平坦部１１１から内方に折り曲げて仕切壁を形成する折曲げ基部２２が形成され、この折曲げ基部２２に連続して断面略円弧状の中柱部２３が形成され、更に、この中柱部２３に連続して先端部２４が形成されている。
【００２０】
折曲げ基部２２は、扁平チューブ１１の平坦部１１１と平行な平行面部２２ａと、この平行面部２２ａと略直角で扁平チューブ１１の他方の端部１１ｂと対向する直角面部２２ｂとからなる受段部を有している。折曲げ基部２２の平行面部２２ａに扁平チューブ１１の他方の端部１１ｂの平坦部１１１が重ねられ、折曲げ基部２２の直角面部２２ｂに扁平チューブ１１の他方の端部１１ｂの先端部が接近して配置されている。この直角面部２２ｂの高さは、扁平チューブ１１の平坦部１１１の厚さとほぼ同一となっており、外周面がほぼ同一高さとなるようになっている。ロウ付け時には、折曲げ基部２２の平行面部２２ａ及び直角面部２２ｂに扁平チューブ１１の他方の端部１１ｂが一体ロウ付けされる。
【００２１】
中柱部２３は、扁平チューブ１１の平坦部１１１に対して略直角に配置され且つ断面略円弧状に形成されている。従って、組付時、扁平チューブ１１の中央付近に圧縮荷重をかけた場合に、この円弧状部分が弾性変形し、組付け後は、この弾性変形部分の反力で扁平チューブ１１にフィン１２が確実に保持される。
【００２２】
先端部２４は、中柱部２３から略直角な方向に曲げられ、扁平チューブ１１の平坦部１１１の内周面と平行に伸びて形成される。この先端部２４が扁平チューブ１１の平坦部１１１の内周面に一体ロウ付けされている。
【００２３】
図６に示すように、仕切壁２１の折曲げ基部２２の平行面部２２ａと扁平チューブ１１の他方の端部１１ｂの平坦部１１１とが面接触し、仕切壁２１の先端部２４と扁平チューブ１１の平坦部１１１の内周面とが面接触しているので、ロウ付強度は高く、外れにくい。
【００２４】
図３に示すように、扁平チューブ１１の短径方向にチューブ１１とフィン１２とを積層した状態で、積層両端部から圧縮荷重を加えると、仕切壁２１の中柱部２３が曲率の大きくなる方向に変形しやすくなる（図に破線で示す）。特に中柱部２３が１枚の板部材からなるので、弾性変形し易く復元力も優れている。
【００２５】
図４は、扁平チューブ１１の端面とヘッダ１４の挿入孔１４ａとの形状関係を示したものである。扁平チューブ１１単体での大きさは、挿入孔１４ａの短径と比較して、扁平チューブのＲ部１１２の短径は小さく、扁平チューブの平坦部１１１の中央部分の短径は大きく形成されている。扁平チューブ１１とフィン１２とを積層して形成したコアを圧縮した場合に、扁平チューブの中央部分の短径が縮小する方向に変形するので、その際の変形逃げ代としてＲ部１１２の短径が挿入孔１４ａの短径より小さく形成されている。
【００２６】
組付時について説明する。扁平チューブ１１とフィン１２の積層体からなるコアを形成し、このコアの両側から圧縮荷重をかける。この時、扁平チューブ１１の断面形状は、ヘッダ１４の挿入孔１４ａの断面形状と相似形に変形しており、挿入されやすくなっている。この状態で扁平チューブ１１の端面をヘッダ１４の挿入孔１４ａに挿入する。その後、圧縮荷重を解除する。すると、扁平チューブ１１は元の形状に戻ろうとする反力が作用する。この反力により、フィン１２が扁平チューブ１１に強く挟持され、搬送時や組付け時にフィン１２が扁平チューブ１１の間から脱落することが防止される。それとともに、上記反力がヘッダ挿入孔１４ａと扁平チューブ１１の端面とを密着する方向に作用するので、お互いが強固にロウ付けされる。
【００２７】
図５は、中柱部２３の外周面にロウ材クラッド（図に斜線を入れて示す）を設けた時の実施例を示す。折曲げ基部２２の平行面部２２ａと扁平チューブ１１の平坦部１１１との面接触部分、及び先端部２４と扁平チューブ１１の平坦部１１１の内周面との面接触部分にロウ材クラッドが設けられているので、ロウ付が確実且つ強固に行なわれる。
【００２８】
図７は、他の実施例を示し、扁平チューブ３０の中央部分の拡大断面図である。折曲げ基部４２の平行面部４２ａ及び直角面部４２ｂに対して、扁平チューブ３０の他方の端部３１が対向面部３２と傾斜面部３３からなる。扁平チューブ３０を内側に折り曲げて折曲げ基部４２の直角面部４２ｂ、及びそれからさらに直角方向に折り曲げて平行面部４２ａを形成するが、扁平チューブ３０の外周面から滑らかに内側に曲がり、さらに逆方向に滑らかな曲率で略直角に折り曲げることとなる。そのために、折曲げ基部４２成形時の曲率によっては、扁平チューブ３０の他方の端部３１を折曲げ基部４２に突き合わせた場合、対向面部３２と直角面部４２ｂとの隙間が大きく開く場合があるが、この実施例では、傾斜面部３３を形成したので、この隙間を小さくできる。従って、傾斜面部３３を設ける必要があるが、折曲げ基部４２成形時の曲率を厳しく管理しなくても良いメリットを有する。
【００２９】
また、図８は図７の変形例であって、傾斜面部の代わりに曲面部３３ａを設けたものである。この曲面部３３ａは折曲げ基部４３の直角面部４３ｂの曲率に合わせた曲率に形成してある。このように成形すると、扁平チューブ３０ａの対向面部３２ａを折曲げ基部４３の直角面部４３ｂに接近して且つ扁平チューブ３０ａの平坦部が折曲げ基部４３の平行面部４３ａに接した状態とすることができる。細工は増えるが、この隙間が懸念される場合には、この実施例のようにすると良い。
【００３０】
本実施例では、仕切り部の中柱部の断面形状を円弧状に形成したが、弾性変形可能で、組付け時復元力を発揮する形状であれば、この形状に限られるものではなく、例えば多曲率形状、Ｓ字形状等や多角形状にしても良い。ただし、円弧状以外では、形状が複雑になるので、弾性変形機能、強度、復元力などを考慮して形状を設定する必要がある。
【００３１】
【発明の効果】
本発明によれば、断面略θ状の扁平チューブの仕切壁に断面略円弧状等の中柱部を設けたので、コアの搬送時や一体ロウ付け時のフィン脱落を防止できるとともに扁平チューブのヘッダへの挿入組付性を容易にできる。また、扁平チューブ単体での大きさについて、ヘッダの挿入孔の短径に対して、扁平チューブの幅方向両端の折曲げ部であるＲ部の径を小さく、扁平チューブの中央部分の短径を大きく形成したので、圧縮荷重により扁平チューブの中央部分の短径を縮めた際の変形代をＲ部で吸収して無理なく圧縮でき、且つ圧縮を解除した際に自然に復元反力が作用し、組付け性とフィンの脱落防止を改善できる。
【００３２】
さらに、中柱部を１枚板とした場合には、中柱部の弾性変形性及び変形復元性が良く、フィン脱落防止機能が優れ且つ扁平チューブの組付性にも優れている。
【００３３】
また、仕切壁の外周にロウ材クラッドを設けることにより、圧縮時に扁平チューブの平坦部の内周面に対して、仕切壁の折曲げ部及び先端部が確実に密着してロウ付けされる。
【００３４】
扁平チューブの他方の端部の対向面部の内側に傾斜面部或いは曲面部を設けた場合には、折曲げ基部に扁平チューブの他方の端部を重ねた際に、両者の間隙を狭くできるとともに、他方の端部が盛り上がり扁平チューブの外周面高さが不揃いになることを防止できる。
【図面の簡単な説明】
【図１】 本発明の熱交換器の概略構成を示す斜視図である。
【図２】 本発明の扁平チューブの斜視図である。
【図３】 本発明の扁平チューブの部分図である。
【図４】 本発明に係わる扁平チューブとヘッダの挿入孔との形状関係を示す説明図である。
【図５】 本発明の扁平チューブの仕切壁のロウ材クラッドを示す説明図である。
【図６】 本発明の扁平チューブの中央部分を示す部分図である。
【図７】 本発明の扁平チューブの中央部分の別の実施例を示す拡大断面図である。
【図８】 本発明の扁平チューブの中央部分の更に別の実施例を示す拡大断面図である。
【図９】 従来の扁平チューブの斜視図である。
【図１０】 従来の別の扁平チューブの斜視図である。
【符号の説明】
１１ 扁平チューブ
１１１ 平坦部
１１２ Ｒ部
１１ａ 一方の端部
１１ｂ 他方の端部
１２ フィン
１３ エンドプレート
１４ ヘッダ
１４ａ 挿入孔
１５ コネクタタンク
１６ パイプ
１７ リターンタンク
２１ 仕切壁
２２ 折曲げ基部
２２ａ 平行面部
２２ｂ 直角面部
２３ 中柱部
２４ 先端部
３０ 扁平チューブ
３１ 他方の端部
３２ 対向面部
３３ 傾斜面部
４２ 折曲げ基部
４２ａ 平行面部
４２ｂ 直角面部
３０ａ 扁平チューブ
３３ａ 曲面部
４３ 折曲げ基部
４３ａ 平行面部
４３ｂ 直角面部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger tube used in a heat exchanger such as a vehicle air conditioner.
[0002]
[Prior art]
Conventionally, for example, as shown in FIG. 9, a flat tube used for a heater core of a hot water heating device is formed by bending an aluminum thin plate material called an electric sewing tube into a U shape at a substantially central portion in the width direction, and further, both end portions in the width direction. The vicinity is bent in an R shape toward the inner surface of the tube, the end surfaces of both end portions in the width direction are brought into contact with each other, and the contact portions are welded. The short diameter dimension of such a single ERW tube is larger in the vicinity of the central portion than in the vicinity of the R portion in consideration of assembly.
[0003]
When assembling the heat exchanger, a laminated body (core) in which flat tubes and fins are laminated in the flat tube minor axis direction is compressed by applying a compressive load in the minor axis direction. At this time, due to the compressive load, the flat tube has a short axis dimension that is substantially the same in the vicinity of the central portion and in the vicinity of the R portion, and the long sides of the flat tubes facing each other are deformed substantially in parallel.
[0004]
When the end face of the compressed flat tube of the core is inserted into the insertion hole of the header and the compressive load in the core stacking direction is released, a force (reaction force) is generated for the deformed tube to return to the original shape.
[0005]
This reaction force becomes a force for holding the fins laminated adjacent to the flat tube, and acts to prevent the fins from falling off the heat exchanger when the heat exchanger is integrally brazed.
[0006]
By the way, in recent years, as shown in FIG. 10, in a heat exchanger using an aluminum material, a thin aluminum plate material generally called a folded tube is sequentially bent to form a partition portion so that the cross-sectional shape of the tube becomes substantially θ-shaped. Flat tubes that are molded into a heat exchange medium flow path are becoming mainstream.
[0007]
[Problems to be solved by the invention]
However, in such a flat tube having a substantially θ-shaped cross section, the minor axis in the vicinity of the R portion and the minor axis in the vicinity of the center are generally formed approximately equal.
[0008]
For example, if the flat tube has a short axis formed larger in the vicinity of the center than in the vicinity of the R part, the middle column part straddles and the short direction rigidity in the vicinity of the central part increases, so that it is difficult to deform when the header is inserted. It becomes difficult to insert a flat tube.
[0009]
For this reason, the height of the flat tube is usually formed to be constant according to the height of the partition wall. In this conventional type, the holding force of the fins laminated adjacent to the flat tube is weak, and the fins are likely to fall off from the core when the core is transported or brazed.
[0010]
In order to solve such problems, the present invention provides a flat tube shape in which the fin is held by elastic deformation of the flat tube and is easily inserted into the header when the core is assembled. Objective.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention, in the flat tube for a heat exchanger having a substantially θ-shaped cross section that is formed by sequentially bending a plate material, the central partition wall of the substantially θ-shaped cross section is formed in a shape that can be elastically deformed. In addition, the short diameter near the R portion, which is the bent portion at both ends in the width direction of the flat tube, is smaller than the short diameter of the insertion hole of the header tube into which the flat tube is inserted, and near the central portion of the flat tube. The minor axis is formed large.
[0012]
With this configuration, when a core is assembled by stacking flat tubes and fins, the core can be compressed, so the end of the flat tube can be easily inserted into the header, and when the compressed state is released, the restoring force of the flat tube Thus, the fin is firmly held. In addition, the short diameter near the R part at both ends in the width direction of the flat tube is small and the short diameter near the center is large with respect to the insertion hole short diameter of the header tube. It becomes easy to insert and it can be set as the structure excellent in the retention strength of a fin by canceling | compressing compression.
[0013]
According to a second aspect of the present invention, in the heat exchanger tube according to the first aspect, the sectional shape of the partition wall is formed in a substantially arc shape. The ease of assembly with the tube and the integral brazing are greatly improved.
[0014]
According to a third aspect of the present invention, in the heat exchanger tube according to the first or second aspect, a brazing material clad is provided on the outer peripheral surface of the partition wall, and the partition wall and the flat portion of the flat tube Brazeability is improved.
[0015]
In the invention of claim 4, in the heat exchanger tube according to claim 3, the flat tube for heat exchanger is formed by bending one plate material, and one end of the plate material forms a partition wall, The other end is joined to the bent base of the one end, and the middle post is formed at one end, so that the middle post is easily elastically deformed and has good resilience. In addition, the material cost can be reduced.
[0016]
According to a fifth aspect of the present invention, in the heat exchanger tube according to any one of the first to fourth aspects, the partition wall is formed to extend to the middle column portion having a substantially arc-shaped cross section and the tip of the middle column portion. The distal end portion includes a bending base portion of the middle column portion, and the distal end portion is formed by extending along the inner peripheral surface of the flat portion of the outer peripheral wall of the flat tube and brazed to the inner peripheral surface. Since the bending base has a stepped portion that receives the other end of the flat tube, the brazing strength between the partition wall and both flat portions is excellent.
[0017]
According to a sixth aspect of the present invention, in the heat exchanger tube according to the fourth or fifth aspect, the bent base portion has a parallel surface portion parallel to the flat portion and a right-angle surface portion substantially perpendicular to the parallel surface portion, The other end of the flat tube is configured to have an opposing surface portion facing the right-angled surface portion and an inclined surface portion on the inner side, and when the other end portion is assembled to the bent base portion, the gap between each other is reduced. Since it can be formed, the brazing property is improved.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described based on the embodiment shown in FIG. FIG. 1 shows a heat exchanger 10 according to the present invention. The flat tube 11 and the fin 12 are laminated | stacked, and the end plate 13 is arrange | positioned at the both sides. The core composed of the flat tubes 11 and the fins 12 is inserted into the insertion holes 14a (see FIG. 4) of the upper and lower headers 14 and brazed together. A connector tank 15 is connected to the upper header 14, and a pipe 16 is communicated with the connector tank 15. A return tank 17 is connected to the lower header 14.
[0019]
FIG. 2 shows a cross-sectional shape of the flat tube 11, and FIG. 3 shows an enlarged cross-sectional view near the center of the flat tube 11. The flat tube 11 is made of a single thin plate made of aluminum having a substantially θ-shaped cross section. Both ends of the thin plate are bent into a substantially U shape, a partition wall 21 is formed at one end 11a, and the other end 11b is abutted and joined to the partition wall 21. The partition wall 21 is formed with a bent base portion 22 that is bent inward from the flat portion 111 of the flat tube 11 to form a partition wall. Further, a leading end portion 24 is formed continuously with the middle column portion 23.
[0020]
The bending base portion 22 includes a parallel surface portion 22a that is parallel to the flat portion 111 of the flat tube 11 and a right-angle surface portion 22b that is substantially perpendicular to the parallel surface portion 22a and faces the other end portion 11b of the flat tube 11. have. The flat portion 111 of the other end portion 11b of the flat tube 11 is overlapped with the parallel surface portion 22a of the bent base portion 22, and the distal end portion of the other end portion 11b of the flat tube 11 approaches the right angle surface portion 22b of the bent base portion 22. Are arranged. The height of the right-angled surface portion 22b is substantially the same as the thickness of the flat portion 111 of the flat tube 11, and the outer peripheral surface is substantially the same height. At the time of brazing, the other end portion 11b of the flat tube 11 is integrally brazed to the parallel surface portion 22a and the right-angle surface portion 22b of the bent base portion 22.
[0021]
The middle column portion 23 is disposed substantially perpendicular to the flat portion 111 of the flat tube 11 and has a substantially arcuate cross section. Therefore, when a compressive load is applied near the center of the flat tube 11 during assembly, the arc-shaped portion is elastically deformed, and after assembly, the fin 12 is attached to the flat tube 11 by the reaction force of the elastic deformation portion. Holds securely.
[0022]
The distal end portion 24 is bent in a direction substantially perpendicular to the middle column portion 23 and is formed to extend in parallel with the inner peripheral surface of the flat portion 111 of the flat tube 11. The distal end portion 24 is integrally brazed to the inner peripheral surface of the flat portion 111 of the flat tube 11.
[0023]
As shown in FIG. 6, the parallel surface portion 22 a of the bent base portion 22 of the partition wall 21 and the flat portion 111 of the other end portion 11 b of the flat tube 11 are in surface contact, and the distal end portion 24 of the partition wall 21 and the flat tube 11 are in contact with each other. Since the flat portion 111 is in surface contact with the inner peripheral surface, the brazing strength is high and it is difficult to come off.
[0024]
As shown in FIG. 3, when a compressive load is applied from both ends of the laminated layer in a state where the tube 11 and the fin 12 are laminated in the minor axis direction of the flat tube 11, the middle column portion 23 of the partition wall 21 has a large curvature. It becomes easy to deform in the direction (indicated by a broken line in the figure). In particular, since the middle column portion 23 is made of a single plate member, it is easily elastically deformed and has excellent restoring force.
[0025]
FIG. 4 shows the shape relationship between the end surface of the flat tube 11 and the insertion hole 14 a of the header 14. The size of the flat tube 11 alone is smaller than the short diameter of the insertion hole 14a, and the short diameter of the R portion 112 of the flat tube is small, and the short diameter of the central portion of the flat portion 111 of the flat tube is large. Yes. When the core formed by laminating the flat tube 11 and the fin 12 is compressed, it deforms in a direction in which the short diameter of the central portion of the flat tube is reduced. Therefore, the short diameter of the R portion 112 is used as a deformation clearance at that time. Is formed smaller than the minor axis of the insertion hole 14a.
[0026]
The assembly time will be described. A core composed of a laminate of the flat tube 11 and the fins 12 is formed, and a compressive load is applied from both sides of the core. At this time, the cross-sectional shape of the flat tube 11 is deformed to be similar to the cross-sectional shape of the insertion hole 14a of the header 14, and is easily inserted. In this state, the end surface of the flat tube 11 is inserted into the insertion hole 14 a of the header 14. Thereafter, the compression load is released. Then, a reaction force is applied to the flat tube 11 to return to the original shape. Due to this reaction force, the fins 12 are strongly held between the flat tubes 11, and the fins 12 are prevented from falling off between the flat tubes 11 during transport or assembly. At the same time, the reaction force acts in a direction in which the header insertion hole 14a and the end surface of the flat tube 11 are in close contact with each other, so that they are firmly brazed together.
[0027]
FIG. 5 shows an embodiment in which a brazing material clad (shown by hatching in the figure) is provided on the outer peripheral surface of the middle pillar portion 23. A brazing material clad is provided on a surface contact portion between the parallel surface portion 22a of the bent base portion 22 and the flat portion 111 of the flat tube 11 and a surface contact portion between the distal end portion 24 and the inner peripheral surface of the flat portion 111 of the flat tube 11. Therefore, brazing is performed reliably and firmly.
[0028]
FIG. 7 shows another embodiment and is an enlarged cross-sectional view of the central portion of the flat tube 30. The other end portion 31 of the flat tube 30 is composed of an opposing surface portion 32 and an inclined surface portion 33 with respect to the parallel surface portion 42 a and the right-angle surface portion 42 b of the bending base portion 42. The flat tube 30 is bent inward to form a right-angle surface portion 42b of the bent base 42, and then further bent in a right-angle direction to form a parallel surface portion 42a, but smoothly bends inward from the outer peripheral surface of the flat tube 30 and further in the opposite direction. It will be bent at a right angle with a smooth curvature. Therefore, depending on the curvature at the time of forming the bent base portion 42, when the other end portion 31 of the flat tube 30 is abutted against the bent base portion 42, there may be a case where a gap between the opposed surface portion 32 and the right angle surface portion 42b is greatly opened. In this embodiment, since the inclined surface portion 33 is formed, this gap can be reduced. Therefore, although it is necessary to provide the inclined surface part 33, there exists a merit which does not need to manage strictly the curvature at the time of bending | flexion base part 42 shaping | molding.
[0029]
FIG. 8 is a modification of FIG. 7 in which a curved surface portion 33a is provided instead of the inclined surface portion. The curved surface portion 33 a is formed with a curvature that matches the curvature of the right-angle surface portion 43 b of the bending base portion 43. When formed in this manner, the facing surface portion 32a of the flat tube 30a is brought close to the right-angle surface portion 43b of the bending base portion 43 and the flat portion of the flat tube 30a is in contact with the parallel surface portion 43a of the bending base portion 43. it can. Although the work is increased, if this gap is a concern, this embodiment is preferred.
[0030]
In the present embodiment, the cross-sectional shape of the middle pillar portion of the partition portion is formed in an arc shape, but is not limited to this shape as long as it is elastically deformable and exhibits a restoring force during assembly. A multi-curvature shape, an S-shape, or a polygonal shape may be used. However, since the shape is complicated except for the arc shape, it is necessary to set the shape in consideration of the elastic deformation function, the strength, the restoring force, and the like.
[0031]
【The invention's effect】
According to the present invention, because the partition wall of the flat tube having a substantially θ-shaped cross section is provided with a middle column portion such as a substantially arc-shaped cross section, it is possible to prevent the fins from falling off during the transportation of the core or the integral brazing and Easy insertion and assembly into the header. In addition, regarding the size of the flat tube alone, the radius of the R portion, which is the bent portion at both ends in the width direction of the flat tube, is smaller than the minor axis of the insertion hole of the header, and the minor axis of the central portion of the flat tube Since it is formed large, the deformation allowance when the short diameter of the central part of the flat tube is shortened by the compression load can be absorbed by the R part, and it can be compressed without difficulty, and the restoring reaction force acts naturally when the compression is released. As a result, it is possible to improve the ease of assembly and the prevention of fins from falling off.
[0032]
Further, when the middle column portion is a single plate, the middle column portion has good elastic deformability and deformation recovery property, has an excellent function of preventing the fin from falling off, and is excellent in assembling property of the flat tube.
[0033]
In addition, by providing the brazing material clad on the outer periphery of the partition wall, the bent portion and the distal end portion of the partition wall are securely adhered and brazed to the inner peripheral surface of the flat portion of the flat tube during compression.
[0034]
When the inclined surface portion or curved surface portion is provided inside the opposite surface portion of the other end portion of the flat tube, when the other end portion of the flat tube is overlapped with the bending base, the gap between the two can be narrowed, It is possible to prevent the other end from rising and unevenness in the outer peripheral surface height of the flat tube.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of a heat exchanger according to the present invention.
FIG. 2 is a perspective view of a flat tube of the present invention.
FIG. 3 is a partial view of the flat tube of the present invention.
FIG. 4 is an explanatory view showing a shape relationship between a flat tube and a header insertion hole according to the present invention.
FIG. 5 is an explanatory view showing brazing material clad of the partition wall of the flat tube of the present invention.
FIG. 6 is a partial view showing a central portion of the flat tube of the present invention.
FIG. 7 is an enlarged sectional view showing another embodiment of the central portion of the flat tube of the present invention.
FIG. 8 is an enlarged sectional view showing still another embodiment of the central portion of the flat tube of the present invention.
FIG. 9 is a perspective view of a conventional flat tube.
FIG. 10 is a perspective view of another conventional flat tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Flat tube 111 Flat part 112 R part 11a One end part 11b The other end part 12 Fin 13 End plate 14 Header 14a Insertion hole 15 Connector tank 16 Pipe 17 Return tank 21 Partition wall 22 Bending base part 22a Parallel surface part 22b Right angle part 23 Middle column portion 24 Tip portion 30 Flat tube 31 The other end portion 32 Opposing surface portion 33 Inclined surface portion 42 Bending base portion 42a Parallel surface portion 42b Right angle surface portion 30a Flat tube 33a Curved surface portion 43 Bending base portion 43a Parallel surface portion 43b Right angle surface portion

Claims (6)

板材を順次折り曲げて成形する略θ状断面を有する熱交換器用扁平チューブにおいて、
上記略θ状断面の中央の仕切壁が弾性変形可能な形状に形成され、
上記扁平チューブが挿入されるヘッダチューブの挿入孔短径に対して、該扁平チューブの幅方向両端の折曲げ部であるＲ部付近の短径が小さく、且つ扁平チューブの中央部付近の短径が大きく形成されていることを特徴とする熱交換器用チューブ。In a flat tube for a heat exchanger having a substantially θ-shaped cross section that is formed by sequentially bending a plate material,
The partition wall at the center of the substantially θ-shaped cross section is formed into a shape that can be elastically deformed,
The short diameter near the center of the flat tube is small, and the short diameter near the R portion, which is a bent portion at both ends in the width direction of the flat tube, is smaller than the short diameter of the insertion hole of the header tube into which the flat tube is inserted. A tube for a heat exchanger, characterized in that is formed large. 該仕切壁の断面形状が略円弧状であることを特徴とする請求項１記載の熱交換器用チューブ。  2. The heat exchanger tube according to claim 1, wherein the partition wall has a substantially arcuate cross section. 該仕切壁の外周面にロウ材クラッドが設けられたことを特徴とする請求項１または２記載の熱交換器用チューブ。  The heat exchanger tube according to claim 1 or 2, wherein a brazing material clad is provided on an outer peripheral surface of the partition wall. 熱交換器用扁平チューブは１枚の板材を折り曲げて形成されており、該板材の一方の端部が仕切壁を形成し、他方の端部が該一方の端部の折曲げ基部に接合されていることを特徴とする請求項１ないし３のいずれか記載の熱交換器用チューブ。  A flat tube for a heat exchanger is formed by bending a single plate, and one end of the plate forms a partition wall, and the other end is joined to a bent base of the one end. The heat exchanger tube according to any one of claims 1 to 3, wherein the heat exchanger tube is provided. 該仕切壁は、断面略円弧状の中柱部と、その中柱部の先端に伸びて形成された先端部と、該中柱部の折曲げ基部とからなり、該先端部は扁平チューブ外周壁の平坦部の内周面に沿って伸び、該内周面にロウ付けされ、該折曲げ基部は扁平チューブの他方の端部を受ける受段部を有することを特徴とする請求項１ないし４のいずれか記載の熱交換器用チューブ。  The partition wall includes a middle column portion having a substantially arc-shaped cross section, a tip portion formed extending to the tip of the middle column portion, and a bent base portion of the middle column portion, and the tip portion is a flat tube outer periphery. 2. The wall according to claim 1, further comprising: a step portion extending along an inner peripheral surface of the flat portion of the wall and brazed to the inner peripheral surface, wherein the bent base portion receives the other end portion of the flat tube. 4. The heat exchanger tube according to any one of 4 above. 該折曲げ基部は、該平坦部と平行な平行面部とこの平行面部と略直角な直角面部とを有し、該扁平チューブの該他方の端部は、該直角面部と対向する対向面部と内側に傾斜面部を有することを特徴とする請求項４または５記載の熱交換器用チューブ。  The bent base portion has a parallel surface portion parallel to the flat portion and a right-angle surface portion substantially perpendicular to the parallel surface portion, and the other end of the flat tube has an opposite surface portion and an inner side facing the right-angle surface portion. 6. The heat exchanger tube according to claim 4, further comprising an inclined surface portion.
JP2000324539A 2000-10-24 2000-10-24 Tube for heat exchanger Expired - Fee Related JP4585682B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0302232A1 (en) * 1987-08-01 1989-02-08 Behr GmbH & Co. Flat tube for a heat exchanger
JPH10111091A (en) * 1996-10-08 1998-04-28 Zexel Corp Heat exchanger
JPH1183364A (en) * 1997-09-16 1999-03-26 Zexel Corp Tube for heat exchanger and its manufacture
JP2000205776A (en) * 1999-01-19 2000-07-28 Calsonic Kansei Corp Flat tube heat exchange and its manufacture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0302232A1 (en) * 1987-08-01 1989-02-08 Behr GmbH & Co. Flat tube for a heat exchanger
JPH10111091A (en) * 1996-10-08 1998-04-28 Zexel Corp Heat exchanger
JPH1183364A (en) * 1997-09-16 1999-03-26 Zexel Corp Tube for heat exchanger and its manufacture
JP2000205776A (en) * 1999-01-19 2000-07-28 Calsonic Kansei Corp Flat tube heat exchange and its manufacture

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