JP4536273B2 - Flat tube for heat exchanger and method of manufacturing heat exchanger - Google Patents

Flat tube for heat exchanger and method of manufacturing heat exchanger Download PDF

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JP4536273B2
JP4536273B2 JP2001024055A JP2001024055A JP4536273B2 JP 4536273 B2 JP4536273 B2 JP 4536273B2 JP 2001024055 A JP2001024055 A JP 2001024055A JP 2001024055 A JP2001024055 A JP 2001024055A JP 4536273 B2 JP4536273 B2 JP 4536273B2
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partition
flat
heat exchanger
flat tube
shaped end
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JP2002228369A (en
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多加司 伊神
雅志 金子
清明 堀江
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T.RAD CO., L T D.
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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
    • F28D1/03—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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、帯状金属板を幅方向に曲折して、外周が偏平な筒状に形成されると共に、内部に仕切部を設けた熱交換器用偏平チューブおよびその偏平チューブを用いた熱交換器の製造方法に関する。
【０００２】
【従来の技術】
従来、内部に仕切部を設けた偏平チューブとして、特公平７−４１３３１号公報記載の「熱交換器用溶接チューブ及びその製造方法」が知られている。これは表面にろう材がクラッドされたアルミニウム製板材をロールフォーミングによって、その両縁部に折り曲げ片を夫々形成する。そしてアルミニウム製板材を偏平な筒状に曲折させ、両折り曲げ片を当接させて、その両折り曲げ片の先端面を夫々内壁に当接させる。そして、その偏平チューブを治具に固定し、加熱炉中に搬入して加熱し、接合する部位をろう付けしてチューブを形成している。
【０００３】
また、特許第２８７５５１７号の「熱交換器用溶接チューブ」は、表面にろう材がクラッドされたアルミニウム製板材を用い、ロールフォーミングによってアルミニウム製板材の一方の側部に差し込み片を設け、他方の側部にＵ字状の受入れ溝片を形成する。そしてアルミニウム製板材を偏平な管状に屈曲させ、受入れ溝片内に差し込み片を挿入して、差し込み片を受入れ溝片で強く圧迫して挟持させる。次いでその偏平チューブを治具で固定し、加熱炉中に搬入し、加熱して接合する部位をろう付けすることによりチューブを形成している。
【０００４】
【発明が解決しようとする課題】
前者の溶接チューブは、両折り曲げ片を当接させて、その部分をろう付けにより接合させているが、折り曲げ片は曲折形成されているため、スプリングバックによりその基部側が開き傾向となり、折り曲げ片の当接部を完全に整合して全長に渡って充分な機密性を保証することは必ずしも充分ではない。
【０００５】
また、後者の溶接チューブは、一方の側部に差し込み片を設け他方の側部に設けたＵ字状の受入れ溝片にその差し込み片を差し込み、強く圧迫して挟持させることとしているが、その手段としては、先ず差し込み片を受入れ溝片に緩く嵌め込み、次いでチューブの両側を一対の側部ローラにより押圧すると記載されている。しかしながら、偏平チューブの両側から側部ローラにより押圧したのみでは、Ｕ字状の受入れ溝片の一方の内壁面と差し込み片とのみが圧接されるに過ぎず、Ｕ字状の受入れ溝片の溝幅を狭くして挟持させることはできない。従って、前者同様にスプリングバックによって受入れ溝片の基部側が開く傾向となることを否定できない。
そこで本発明は、製造し易く且つ曲折成形後のスプリングバックによる影響を可及的に少なくできると共に、確実に継目をろう付けできる熱交換器用偏平チューブおよびそれを用いた熱交換器の製造方法を提供することを課題とする。
【０００６】
【課題を解決するための手段】
請求項１に記載の本発明は、帯状金属板をその幅方向に曲折して、一対の平行に対向する平坦面部(1) と、その両端間が連結される一対の湾曲面部(2) とにより、偏平な筒状に形成されてなる熱交換器用偏平チューブにおいて、
前記帯状金属板は、一方の平面のみにろう材(3)が被覆されたものが用いられ、そのろう材(3) が前記筒状の外面側に位置するように曲折形成され、その一方側の平坦面部(1) の幅方向の中間位置で、その対向する平坦面部(1)側へ折り返し曲折されて、その頂部(4) が対向側の平坦面部(1) の内面に接触し且つ、その折り返しの前記外面側が互いに略全平面で接触して、第１の仕切部(5) が形成され、
前記帯状金属板の一方の縁部(6) が、その第１の仕切部(5) の頂部(4) を越えてそれが巻き込まれるように、その第１の仕切部(5) の高さより短く断面Ｌ字状に折り曲げられてそこにＬ字状端部(7) が形成されると共に、その内面が前記第１の仕切部(5) に隣接して重ね合わされ、
前記帯状金属板の他方の縁部(8) の外面が、前記Ｌ字状端部(7) の外面に接触するように折り曲げられて、その先端部がＬ字状端部(7) よりも長く延在して、そのろう材(3) が第１の仕切部(5) の内面側に近接して対向しまたは、接触し、
その近接して対向しまたは、接触したろう材(3)が溶融し、第１の仕切り(5)と前記Ｌ字状端部(7)との間にそれが浸入して、それらの間が接合されることを特徴とする熱交換器用偏平チューブである。
【０００７】
この発明によれば、折り返されて二重に形成され剛性の高い第１の仕切部５にＬ字状端部７が巻き込まれ、それに隣接して端部折り返し部９が配置されているため、ロールフォーミング等により成形された後のスプリングバックを可及的に少なくし、その成形状態を保持することができる。それにより、偏平チューブの継目部を確実にろう付け固定することが可能となる。なお、Ｌ字状端部７と他方の縁部８とは、互いにその外面側が接触してその部分にろう材３が配置され、第１の仕切部５とＬ字状端部７，縁部８との間には、縁部８の表面のろう材が溶融したときそれらの隙間にそのろう材が浸入することにより、それらの間を一体にろう付け固定することができる。
【０００８】
請求項２に記載の本発明は、請求項１において、
前記Ｌ字状端部(7) に重ね合わされる前記他方の縁部(8) の先端部がそのＬ字状端部(7) よりも長く延在し、その部分が前記第１の仕切部(5) の側に折り返されて端部折り返し部(9) が形成され、その端部折り返し部(9) の頂部(10)が、前記一方側の前記平坦面部(1) の内面に接触すると共に、その折り返しの先端面(11)と前記Ｌ字状端部(7) の先端面(12)との間に空間部(13)が形成された熱交換器用偏平チューブである。
請求項３に記載の本発明は、請求項２において、
Ｌ字状端部(7) の交角αが鋭角に形成され、それに整合して接触するように前記第１の仕切部(5) および端部折り返し部(9) が前記平坦面部(1) に対して傾斜して曲折形成された熱交換器用偏平チューブである。。
請求項４に記載の本発明は、請求項１において、
前記Ｌ字状端部(7) に重ね合わされる前記他方の縁部(8) の先端部がＬ字状端部(7) よりも長く延在し、その部分が前記第１の仕切部(5) の内面に接触するように、その板厚分だけ段付きに曲折された熱交換器用偏平チューブである。
【０００９】
請求項５に記載の本発明は、請求項１において、
前記第１の仕切部(5) から離間し、一方側の平坦面部(1) の幅方向の中間位置で、その対向する平坦面部(1) の側へ折り返し曲折されて、その頂部(14)が対向側の平坦面部(1) の内面に接触し且つ、その折り返しの前記外面側が互いに略全平面で接触して、第２の仕切部(15)が形成され、
その第２の仕切部(15)に隣接して、前記他方側の平坦面部(1) の幅方向の中間位置で、その対向する平坦面部側へ折り返し曲折されて、その頂部(16)が対向側の平坦面部１の内面に接触し且つ、その折り返しの前記外面側が互いに略全平面で接触して、第３の仕切部(17)が形成され、
その第２の仕切部(15)と第３の仕切部(17)との接触面にスリットまたは窓部(18)をその長手方向に断続的に形成し、そのスリットまたは窓部(18)から前記ろう材(3) が露出するように形成された熱交換器用偏平チューブである。
【００１０】
請求項６に記載の本発明は、請求項１において、
前記第１の仕切部(5) から離間し、一方側と他方側の平坦面部(1) の幅方向の中間の互いに整合する位置で、互いに対向する側へ折り返し曲折されて、その頂部(19)どうしが接触し且つ、夫々の折り返しの前記外面側が互いに略全平面で接触して、突き合わせ型仕切部（20）が形成され、
その突き合わされた一対の頂部(19)のうち一方に、ろう材漏出用の切目（21）が形成された熱交換器用偏平チューブである。
【００１１】
請求項７に記載の本発明は、請求項１〜請求項６のいずれかの偏平チューブを用いた熱交換器の製造方法において、
多数の前記偏平チューブ（22）を並列すると共に、各偏平チューブ（22）間にフィン(23)を配置して熱交換器またはそのコアを組み立てる工程と、
次に、その組立て体を高温の炉内に挿入して、前記偏平チューブ（22）に被覆されたろう材(3) を溶融し、ついで冷却固化することによりその偏平チューブ（22）とフィン(23)とを一体にろう付けすると共に、偏平チューブ（22）の継目およびそれと第１の仕切部(5) との間を液密にろう付け固定する工程と、
を具備する熱交換器の製造方法である。
【００１２】
【発明の実施の形態】
次に、図面に基づいて本発明の各実施の形態につき説明する。
図１は本発明の第１の実施の形態を示す横断面図であり、図２はその要部斜視拡大図、図３は同偏平チューブを用いた熱交換器の要部斜視図である。
この熱交換器用偏平チューブは、一方の平面にろう材３が被覆された帯状金属板を、一例としてロールフォーミングによりその幅方向に順次曲折して、外周が平行に対向する一対の平坦面部１と、その両端間が連結する一対の湾曲面部２とを有する偏平な筒状に形成されたものである。そしてその一方側の平坦面部１の幅方向の中間位置で、第１の仕切部５が対向する側へ折り返し曲折形成されて、その頂部４が平坦面部１の内面に接触し且つ、その折り返しの外面側が互いに略全面に渡って接触する。
【００１３】
そして帯状金属板の一方の縁部６が第１の仕切部５の頂部４を越えて、それが巻き込まれるように、そこにＬ字状端部７が第１の仕切部５の高さよりも短く断面Ｌ字状に折り曲げられ、それが第１の仕切部５に接して重ね合わされる。帯状金属板の他方の縁部８には、端部折り返し部９が形成される。この端部折り返し部９は、その先端部がＬ字状端部７よりも長く延在し、その部分が第１の仕切部５の側に折り返される。そして端部折り返し部９の頂部10が一方側の平坦面部１の内面に接触すると共に、その折り返しの先端面11とＬ字状端部７の先端面12との間に空間部13が形成されたものである。
【００１４】
なお、この偏平チューブ22は帯状金属板の展開状態で、第１の仕切部５とＬ字状端部７と縁部８とが曲折形成され、次いで第１の仕切部５に端部折り返し部９の先端部が接触するように折り曲げられ、次いで、Ｌ字状端部７を端部折り返し部９と第１の仕切部５との間に挿入する。そして偏平チューブ22の幅方向両側から図示しないサイドローラにより押圧し、第１の仕切部５にＬ字状端部７と端部折り返し部９とを押し付けるようにして形成することができるものである。このとき、第１の仕切部５は、板材の中間部が継目なしに折り返されたもので、その剛性が強いから、サイドローラの押圧力により移動することがなく、それにＬ字状端部７および端部折り返し部９が圧着される。
【００１５】
このようにして製造された偏平チューブ22は、そのままの状態で適宜長さに切断され、多数定間隔で並列配置されると共に、各チューブの間にコルゲート型のフィンが配置される。また、偏平チューブの両端部は、図示しない一対のチューブプレートまたはタンクの偏平孔に挿通され、全体が組立てられた状態で高温の炉内に挿入される。すると、偏平チューブのろう材３が溶融し、次いでそれを冷却固化することにより、Ｌ字状端部７と端部折り返し部９とが接合されると共に、空間部13に露出するろう材を介して、Ｌ字状端部７と第１の仕切部５との間及び端部折り返し部９の頂部と第１の仕切部５との間の隙間に、そのろう材が浸入し、その状態でろう付け固定される。そして図３に示す如く、偏平チューブ22の外面とフィン23の接触部との間がろう付けされると共に、偏平チューブ22の両端部は図示しないチューブプレートのチューブ挿通孔に挿通された状態で、その挿通部が液密にろう付け固定される。また、第１の仕切部５の折り返された外面側はそこに配置されるろう材の溶融、固化により一体的に接合される。
【００１６】
次に、図４は本発明の第２の実施の形態を示す熱交換器用偏平チューブの横断面図であり、これが前記第１の実施の形態と異なる点は、縁部８の先端部がＬ字状端部７よりも長く延在し、その部分が第１の仕切部５の内面に接触するようにその板厚分だけ段付に曲折されたものである。この例においても、第１の仕切部５と縁部８との間にＬ字状端部７が挟持される。そして高温の炉内で縁部８の外面側のろう材が溶融し、それが第１の仕切部５とＬ字状端部７との隙間に浸入して両者間をろう付けすると共に、縁部８と第１の仕切部５の内面との間もろう付けされる。また、第１の仕切部５の折り返された外面側はそこに配置されるろう材の溶融、固化により一体的に接合される。この例も、偏平チューブ22を曲折成形した後に、それを用いて熱交換器を組立て、全体を高温の炉内に挿入してろう材を溶融し、次いでそれを固化することによりチューブの継目の接合とそれに接触するフィン及びチューブプレートの間を一体的且つ同時にろう付け固定するものである。
【００１７】
次に、図５〜図７は本発明の第３の実施の形態を示す熱交換器用偏平チューブであり、図５はその横断面図、図６は図５のVI部拡大図、図７は偏平チューブの要部斜視図である。
この実施の形態が前記第１の実施の形態と異なる点は、第１の仕切部５から離間した位置に第２の仕切部15が曲折形成されると共に、それに隣接して第３の仕切部17が曲折形成されたものである。そして第２の仕切部15及び第３の仕切部17の各頂部14及び16が、互いに対向面に接触する。第３の仕切部17には、多数の窓部18が図７の如く断続的に形成されている。
このようにすることにより、一対の第２の仕切部15，第３の仕切部17は、窓部18を介して互いにその内面側がろう材によりろう付け固定される。即ち、第３の仕切部17の外表面側のろう材３が溶融すると、それが窓部18を介し第３の仕切部17と第２の仕切部15との接触面に浸入し、両者間を一体的にろう付け固定するものである。
なお、各窓部18間において第２の仕切部15側に同様の図示しない窓部を両者の対向片側に形成し、夫々の外表面のろう材３が互いに露出するように形成してもよい。
【００１８】
次に、図８は本発明の第４の実施の形態を示す熱交換器用偏平チューブの横断面図、図９はその突き合わせ型仕切部20の要部斜視図である。
この例では前記の一対の第２の仕切部15，第３の仕切部17の代わりに、互いに対向面側に偏平チューブの高さの半分に相当する一対の突き合わせ型仕切部20が形成され、その頂部19が互いに接触されたものである。この例では、下側の突き合わせ型仕切部20の頂部19には、図９に示す如く断続的に切目21が形成されている。そして熱交換器組立て後のろう付け工程で、ろう材３が溶融して、その切目21からろう材が突き合わせ型仕切部20の頂部19に浸入し、上下一対の突き合わせ型仕切部20どうしの頂部19が一体にろう付け固定されるものである。
【００１９】
次に、図１０は本発明の第５の実施の形態を示す熱交換器用偏平チューブの横断面図であり、この例が図１の第１の実施の形態と異なる点は、Ｌ字状端部７の交角αが鋭角に形成され、それに整合して接触するように第１の仕切部５及び端部折り返し部９が傾斜して曲折形成されたものである。即ち、Ｌ字状端部７は平坦面部１に対して角αの交角となるように鋭角に形成され、その傾斜角度と同一角度に第１の仕切部５，端部折り返し部９が曲折し且つ、それらが互いに接するようにしたものである。このように形成することにより、Ｌ字状端部７は第１の仕切部５の頂部に係止され、それに端部折り返し部９がさらに係止されることにより、成形後にスプリングバックが生じることを防止できる。
【００２０】
【発明の作用・効果】
請求項１に記載の本発明によれば、帯状金属板の一方の縁部６が剛性の強い第１の仕切部５の頂部４を越えてそれが巻き込まれるように、断面Ｌ字状に折り曲げられるものであるから、第１の仕切部５とＬ字状端部７との相互位置の位置決めを確実に行うことができる。そして帯状金属板の他方の縁部８の外面がＬ字状端部７の外面に接触するように折り曲げられて、その先端部が第１の仕切部５の内面側に近接または対向し或いは接触するようにしたから、チューブ外面側のろう材の溶融によって、第１の仕切り５と前記Ｌ字状端部７との間にそれが浸入して、第１の仕切部５とＬ字状端部７と縁部８との相互間を一体的に且つ液密にろう付け固定して、精度の高い熱交換器用偏平チューブを提供できる。
【００２１】
請求項２に記載の本発明によれば、帯状金属板の他方の縁部８が折り返されて端部折り返し部９を構成し、その端部折り返し部９の頂部10が平坦面部１の内面に接触するものであるから、第１の仕切部５の断面係数を略２倍として、強度の高い熱交換器用偏平チューブを提供できる。
請求項３に記載の本発明によれば、Ｌ字状端部７の交角αが鋭角に形成され、それに第１の仕切部５，端部折り返し部９が整合して平坦面部１に対して傾斜して曲折されたものであるから、Ｌ字状端部７と第１の仕切部５と端部折り返し部９とを互いに締結すると共に、偏平チューブ成形後のスプリングバックを可及的に抑え、精度の高い熱交換器用偏平チューブを提供できる。
【００２２】
請求項４に記載の本発明によれば、Ｌ字状端部７に重ね合わされる縁部８の先端部がＬ字状端部７よりも長く延在し、その部分が第１の仕切部５の内面に接触するように、その板厚分だけ段付に曲折形成されたものであるから、Ｌ字状端部７と縁部８と第１の仕切部５との位置決めを正確に行い、精度の高い熱交換器用偏平チューブを提供できる。
請求項５に記載の本発明によれば、第１の仕切部５から離間して第２の仕切部15及び第３の仕切部17が折り返し曲折され、それらの接触面にスリットまたは窓部18が断続的に形成され、ろう材３がそこに露出するように形成されたから、第２の仕切部15，第３の仕切部17間を互いに一体的にろう付け固定することができる。それにより、断面係数が大きく強度の強い複数の仕切部を有する熱交換器用偏平チューブを提供できる。
【００２３】
請求項６に記載の本発明によれば、互いに整合する位置で一対の突き合わせ型仕切部20が形成され、それらの頂部19の一方に切目21が形成されたものであるから、一対の突き合わせ型仕切部20どうしをろう付けして、強度の強い熱交換器用偏平チューブを提供できる。
請求項７に記載の本発明によれば、多数の偏平チューブ22とフィン23とを組み立てた状態で、偏平チューブ22とフィン23とを一体的にろう付け固定すると同時に、偏平チューブ22自体の継目およびそれと第１の仕切部５との間を液密にろう付け固定することができる。それにより、量産性の高い熱交換器の製造方法を提供できる。
【図面の簡単な説明】
【図１】本発明の熱交換器用偏平チューブの第１の実施の形態を示す横断面図。
【図２】同偏平チューブの要部斜視拡大図。
【図３】同偏平チューブを用いた熱交換器のろう付け状態を示す要部斜視図。
【図４】本発明の熱交換器用偏平チューブの第２の実施の形態を示す横断面図。
【図５】本発明の熱交換器用偏平チューブの第３の実施の形態を示す横断面図。
【図６】図５のVI部拡大図。
【図７】同偏平チューブの要部斜視図。
【図８】本発明の熱交換器用偏平チューブの第４の実施の形態を示す横断面図。
【図９】同偏平チューブの突き合わせ型仕切部20の要部斜視図。
【図１０】本発明の熱交換器用偏平チューブの第５の実施の形態を示す横断面図。
【符号の説明】
１ 平坦面部
２ 湾曲面部
３ ろう材
４ 頂部
５ 第１の仕切部
６ 縁部
７ Ｌ字状端部
８ 縁部
９ 端部折り返し部
10 頂部
11 先端面
12 先端面
13 空間部
14 頂部
15 第２の仕切部
16 頂部
17 第３の仕切部
18 窓部
19 頂部
20 突き合わせ型仕切部
21 切目
22 偏平チューブ
23 フィン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flat tube for a heat exchanger in which a belt-like metal plate is bent in the width direction and formed to have a flat outer periphery and a partition portion is provided inside, and a heat exchanger using the flat tube It relates to a manufacturing method.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a flat tube having a partition portion provided therein, “Welding tube for heat exchanger and manufacturing method thereof” described in Japanese Patent Publication No. 7-41331 is known. In this method, an aluminum plate having a brazing material clad on its surface is roll-formed to form bent pieces on both edges thereof. Then, the aluminum plate material is bent into a flat cylindrical shape, both bent pieces are brought into contact with each other, and the front end surfaces of the both bent pieces are brought into contact with the inner wall. Then, the flat tube is fixed to a jig, carried into a heating furnace and heated, and a portion to be joined is brazed to form a tube.
[0003]
Patent No. 2875517 “welded tube for heat exchanger” uses an aluminum plate whose surface is clad with a brazing material, and is provided with an insertion piece on one side of the aluminum plate by roll forming, and the other side. A U-shaped receiving groove piece is formed in the portion. Then, the aluminum plate material is bent into a flat tube shape, the insertion piece is inserted into the receiving groove piece, and the insertion piece is strongly pressed and clamped by the receiving groove piece. Next, the flat tube is fixed with a jig, carried into a heating furnace, heated and brazed at a portion to be joined to form a tube.
[0004]
[Problems to be solved by the invention]
In the former welded tube, both bent pieces are brought into contact with each other, and the portions are joined by brazing. However, since the bent pieces are bent, the base side tends to open by the spring back, and the bent pieces are It is not always sufficient to perfectly align the abutment and ensure sufficient confidentiality over the entire length.
[0005]
The latter welded tube has an insertion piece on one side and the insertion piece inserted into a U-shaped receiving groove provided on the other side, and is strongly pressed and clamped. As a means, first, the insertion piece is loosely fitted into the receiving groove piece, and then both sides of the tube are pressed by a pair of side rollers. However, only by pressing the side tube from both sides of the flat tube, only one inner wall surface of the U-shaped receiving groove piece and the insertion piece are in pressure contact, and the groove of the U-shaped receiving groove piece It cannot be pinched with a narrow width. Therefore, it cannot be denied that the base side of the receiving groove piece tends to open due to the spring back as in the former case.
Accordingly, the present invention provides a flat tube for a heat exchanger that is easy to manufacture and can reduce the influence of a springback after bending as much as possible, and can be brazed with certainty, and a method of manufacturing a heat exchanger using the same. The issue is to provide.
[0006]
[Means for Solving the Problems]
The present invention according to claim 1 is a method of bending a belt-shaped metal plate in the width direction thereof, a pair of parallel facing flat surface portions (1), and a pair of curved surface portions (2) connected between both ends thereof. In the flat tube for a heat exchanger formed in a flat cylindrical shape,
The band-shaped metal plate is used in which only one plane is coated with the brazing material (3), and the brazing material (3) is bent so that the brazing material (3) is positioned on the cylindrical outer surface side, and one side thereof At the intermediate position in the width direction of the flat surface portion (1) of the flat surface portion (1) is folded back to the opposite flat surface portion (1) side, the top (4) is in contact with the inner surface of the flat surface portion (1) on the opposite side, and The outer surface sides of the folds are in contact with each other in substantially the entire plane to form a first partition (5),
From the height of the first partition (5), one edge (6) of the strip-shaped metal plate is wound over the top (4) of the first partition (5). It is bent into a short L-shaped section to form an L-shaped end (7) there, and its inner surface is superposed adjacent to the first partition (5),
The outer surface of the other edge portion (8) of the strip-shaped metal plate is bent so as to contact the outer surface of the L-shaped end portion (7), and the tip portion thereof is more than the L-shaped end portion (7). It extends for a long time, and its brazing material (3) faces or contacts the inner surface of the first partition (5).
The brazing material (3) facing or in close proximity melts and enters between the first partition (5) and the L-shaped end (7). It is the flat tube for heat exchangers characterized by being joined .
[0007]
According to the present invention, the L-shaped end portion 7 is wound around the first partition portion 5 that is folded back to form a double layer and has high rigidity, and the end portion folding portion 9 is disposed adjacent to the L-shaped end portion 9. The spring back after being formed by roll forming or the like can be reduced as much as possible, and the formed state can be maintained. Thereby, it becomes possible to securely braze and fix the joint portion of the flat tube. Note that the L-shaped end portion 7 and the other edge portion 8 are in contact with each other on the outer surface side, and the brazing material 3 is disposed at that portion, and the first partition portion 5 and the L-shaped end portion 7, the edge portion. When the brazing filler metal on the surface of the edge portion 8 is melted, the brazing filler metal penetrates into the gaps between them so that they can be brazed and fixed together.
[0008]
The present invention according to claim 2 is the method according to claim 1,
The tip of the other edge portion (8) superimposed on the L-shaped end portion (7) extends longer than the L-shaped end portion (7), and that portion is the first partition portion. (5) is folded back to form an end folded portion (9), and the top (10) of the end folded portion (9) contacts the inner surface of the flat surface portion (1) on the one side. At the same time, the heat exchanger is a flat tube for a heat exchanger in which a space portion (13) is formed between the folded tip end surface (11) and the tip end surface (12) of the L-shaped end portion (7).
The present invention described in claim 3 provides the method according to claim 2,
The intersecting angle α of the L-shaped end portion (7) is formed at an acute angle, and the first partition portion (5) and the end turn-up portion (9) are arranged on the flat surface portion (1) so as to align and contact with each other. It is a flat tube for a heat exchanger that is inclined and bent. .
The present invention according to claim 4 provides the method according to claim 1,
The tip of the other edge (8) superimposed on the L-shaped end (7) extends longer than the L-shaped end (7), and that portion is the first partition ( It is a flat tube for a heat exchanger that is bent in steps by the thickness of the plate so as to contact the inner surface of 5).
[0009]
The present invention described in claim 5 provides the method according to claim 1,
It is spaced apart from the first partition (5) and is folded back to the side of the opposing flat surface (1) at the intermediate position in the width direction of the flat surface (1) on one side, and the top (14) Are in contact with the inner surface of the flat surface portion (1) on the opposite side, and the outer surface sides of the folded back are in contact with each other in substantially the entire plane, thereby forming a second partition portion (15),
Adjacent to the second partition part (15), it is folded back to the opposite flat surface part side at the intermediate position in the width direction of the other flat surface part (1), and the top part (16) is opposed. A third partition portion (17) is formed by contacting the inner surface of the flat surface portion 1 on the side and contacting the outer surface sides of the folded portions with each other in substantially the entire plane.
A slit or window (18) is intermittently formed in the longitudinal direction on the contact surface between the second partition (15) and the third partition (17), and the slit or window (18) It is a flat tube for a heat exchanger formed so that the brazing material (3) is exposed.
[0010]
The present invention described in claim 6 provides the method according to claim 1,
It is spaced apart from the first partition part (5) and is bent back to the opposite side at a position in the middle of the width direction of the flat surface part (1) on the one side and the other side to be opposed to each other. ) And the outer surface sides of the respective folds are in contact with each other in substantially all planes, and a butt-type partition (20) is formed,
It is a flat tube for a heat exchanger in which a notch (21) for brazing material leakage is formed in one of the paired top portions (19).
[0011]
The present invention according to claim 7 is a method for producing a heat exchanger using the flat tube according to any one of claims 1 to 6,
Assembling a heat exchanger or its core by arranging a large number of the flat tubes (22) in parallel and arranging fins (23) between the flat tubes (22);
Next, the assembly is inserted into a high-temperature furnace to melt the brazing material (3) coated on the flat tube (22), and then to cool and solidify the flat tube (22) and fins (23 ) And brazing and fixing the joint between the flat tube (22) and the first partition (5) in a liquid-tight manner;
The manufacturing method of the heat exchanger which comprises this.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, each embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a first embodiment of the present invention, FIG. 2 is an enlarged perspective view of main parts thereof, and FIG. 3 is a perspective view of main parts of a heat exchanger using the flat tubes.
This flat tube for a heat exchanger includes a pair of flat surface portions 1 whose outer peripheries face each other in parallel by, for example, bending a band-shaped metal plate coated with a brazing material 3 on one plane in the width direction by roll forming as an example. These are formed in a flat cylindrical shape having a pair of curved surface portions 2 connected between both ends. Then, at the intermediate position in the width direction of the flat surface portion 1 on the one side, the first partition portion 5 is folded back to the opposite side, the top portion 4 is in contact with the inner surface of the flat surface portion 1, and the folded portion The outer surface sides contact each other over substantially the entire surface.
[0013]
Then, the L-shaped end portion 7 is higher than the height of the first partition portion 5 so that one edge portion 6 of the belt-shaped metal plate passes over the top portion 4 of the first partition portion 5 and is caught there. It is bent into a short L-shaped cross section, and it is overlapped with the first partition 5. An end folded portion 9 is formed on the other edge 8 of the band-shaped metal plate. The end folding portion 9 has a tip portion extending longer than the L-shaped end portion 7, and the portion is folded back toward the first partition portion 5. The top portion 10 of the end folded portion 9 comes into contact with the inner surface of the flat surface portion 1 on one side, and a space portion 13 is formed between the folded tip surface 11 and the tip surface 12 of the L-shaped end portion 7. It is a thing.
[0014]
In this flat tube 22, the first partition portion 5, the L-shaped end portion 7, and the edge portion 8 are formed in a bent state in the developed state of the band-shaped metal plate, and then the end folding portion is formed in the first partition portion 5. Then, the L-shaped end portion 7 is inserted between the end folded portion 9 and the first partition portion 5. The flat tube 22 can be formed by pressing from both sides in the width direction with a side roller (not shown) and pressing the L-shaped end portion 7 and the end folded portion 9 against the first partition portion 5. . At this time, the first partition portion 5 is obtained by folding the intermediate portion of the plate material without a seam, and since the rigidity thereof is strong, the first partition portion 5 does not move due to the pressing force of the side roller, and has an L-shaped end portion 7. And the edge folding | returning part 9 is crimped | bonded.
[0015]
The flat tubes 22 manufactured in this way are appropriately cut into lengths as they are, arranged in parallel at a large number of regular intervals, and corrugated fins are arranged between the tubes. Further, both ends of the flat tube are inserted into flat holes of a pair of tube plates or tanks (not shown), and are inserted into a high-temperature furnace in a state where the flat tubes are assembled. Then, the brazing filler metal 3 of the flat tube is melted and then cooled and solidified, so that the L-shaped end portion 7 and the end folded portion 9 are joined, and the brazing filler metal exposed to the space portion 13 is interposed. The brazing material enters the gap between the L-shaped end portion 7 and the first partition portion 5 and between the top portion of the end turn-up portion 9 and the first partition portion 5, and in this state It is fixed by brazing. And as shown in FIG. 3, while the outer surface of the flat tube 22 and the contact part of the fin 23 are brazed, the both ends of the flat tube 22 are inserted in the tube insertion hole of the tube plate which is not illustrated, The insertion part is brazed and fixed in a liquid-tight manner. Further, the folded outer surface side of the first partition portion 5 is integrally joined by melting and solidifying the brazing material disposed there.
[0016]
Next, FIG. 4 is a cross-sectional view of a flat tube for a heat exchanger showing a second embodiment of the present invention. This is different from the first embodiment in that the tip of the edge 8 is L. It extends longer than the character-shaped end portion 7, and is bent in a stepped manner by the plate thickness so that the portion contacts the inner surface of the first partition portion 5. Also in this example, the L-shaped end portion 7 is sandwiched between the first partition portion 5 and the edge portion 8. Then, the brazing material on the outer surface side of the edge portion 8 is melted in a high-temperature furnace, and it enters the gap between the first partition portion 5 and the L-shaped end portion 7 to braze between the two. The part 8 and the inner surface of the first partition part 5 are also brazed. Further, the folded outer surface side of the first partition portion 5 is integrally joined by melting and solidifying the brazing material disposed there. In this example, the flat tube 22 is bent and then used to assemble a heat exchanger, the whole is inserted into a high temperature furnace to melt the brazing material, and then solidify the tube seam. The joint and the fins and the tube plates that are in contact with each other are integrally and simultaneously brazed and fixed.
[0017]
Next, FIG. 5 to FIG. 7 are flat tubes for a heat exchanger showing a third embodiment of the present invention, FIG. 5 is a transverse sectional view thereof, FIG. 6 is an enlarged view of a VI portion of FIG. It is a principal part perspective view of a flat tube.
This embodiment is different from the first embodiment in that a second partition 15 is bent at a position separated from the first partition 5 and a third partition is adjacent to the second partition 15. 17 is a bent formation. And each top part 14 and 16 of the 2nd partition part 15 and the 3rd partition part 17 mutually contacts an opposing surface. A number of window portions 18 are intermittently formed in the third partition portion 17 as shown in FIG.
By doing so, the inner surfaces of the pair of second partition part 15 and third partition part 17 are brazed and fixed to each other through the window part 18 by the brazing material. That is, when the brazing filler metal 3 on the outer surface side of the third partition 17 is melted, it enters the contact surface between the third partition 17 and the second partition 15 through the window 18 and Are integrally brazed and fixed.
It is to be noted that a similar window (not shown) may be formed on the second partition 15 side between the windows 18 so that the brazing materials 3 on the outer surfaces of the windows 18 are exposed to each other. .
[0018]
Next, FIG. 8 is a cross-sectional view of a flat tube for a heat exchanger showing a fourth embodiment of the present invention, and FIG. 9 is a perspective view of an essential part of the butt partition 20.
In this example, instead of the pair of second partition parts 15 and the third partition part 17, a pair of butt-type partition parts 20 corresponding to half the height of the flat tube are formed on opposite surfaces. Their tops 19 are in contact with each other. In this example, cuts 21 are intermittently formed in the top portion 19 of the lower butt-type partition portion 20 as shown in FIG. In the brazing process after the heat exchanger is assembled, the brazing material 3 is melted, and the brazing material penetrates into the top 19 of the butt partition 20 from the cuts 21, and the top of the pair of upper and lower butt partitions 20. 19 is fixed by brazing together.
[0019]
Next, FIG. 10 is a cross-sectional view of a flat tube for a heat exchanger showing a fifth embodiment of the present invention. This example is different from the first embodiment in FIG. The crossing angle α of the portion 7 is formed at an acute angle, and the first partition portion 5 and the end turn-up portion 9 are inclined and bent so as to align and contact with each other. That is, the L-shaped end portion 7 is formed at an acute angle so as to form an angle α with respect to the flat surface portion 1, and the first partition portion 5 and the end folding portion 9 are bent at the same angle as the inclination angle. In addition, they are in contact with each other. By forming in this way, the L-shaped end portion 7 is locked to the top portion of the first partitioning portion 5, and the end folded portion 9 is further locked thereto, thereby causing a spring back after molding. Can be prevented.
[0020]
[Operation and effect of the invention]
According to the first aspect of the present invention, the one edge portion 6 of the belt-shaped metal plate is bent into an L-shaped cross section so that it is wound over the top portion 4 of the first partition portion 5 having high rigidity. Therefore, the mutual positioning of the first partition portion 5 and the L-shaped end portion 7 can be reliably performed. Then, the outer surface of the other edge portion 8 of the belt-shaped metal plate is bent so as to contact the outer surface of the L-shaped end portion 7, and the front end portion thereof is close to or opposed to the inner surface side of the first partition portion 5. Since the brazing material on the outer surface side of the tube is melted , it penetrates between the first partition 5 and the L-shaped end 7 and the first partition 5 and the L-shaped end. The flat tube for a heat exchanger with high accuracy can be provided by brazing and fixing the portion 7 and the edge portion 8 integrally and in a liquid-tight manner.
[0021]
According to the second aspect of the present invention, the other edge portion 8 of the belt-shaped metal plate is folded back to form the end folded portion 9, and the top portion 10 of the end folded portion 9 is formed on the inner surface of the flat surface portion 1. Since they are in contact with each other, a flat tube for a heat exchanger with high strength can be provided by setting the section modulus of the first partition portion 5 approximately twice.
According to the third aspect of the present invention, the intersection angle α of the L-shaped end portion 7 is formed as an acute angle, and the first partition portion 5 and the end turn-up portion 9 are aligned with the flat surface portion 1. Since it is bent at an angle, the L-shaped end portion 7, the first partitioning portion 5 and the end turn-up portion 9 are fastened to each other and the spring back after the flat tube is formed is suppressed as much as possible. A flat tube for a heat exchanger with high accuracy can be provided.
[0022]
According to the fourth aspect of the present invention, the tip end portion of the edge portion 8 superimposed on the L-shaped end portion 7 extends longer than the L-shaped end portion 7, and the portion is the first partition portion. 5 is formed in a stepped manner so as to be in contact with the inner surface of the plate 5 so that the L-shaped end portion 7, the edge portion 8, and the first partition portion 5 are accurately positioned. A flat tube for a heat exchanger with high accuracy can be provided.
According to the fifth aspect of the present invention, the second partition portion 15 and the third partition portion 17 are folded back apart from the first partition portion 5, and slits or window portions 18 are formed on their contact surfaces. Since the brazing material 3 is formed so as to be exposed there, the second partition portion 15 and the third partition portion 17 can be integrally brazed and fixed to each other. Thereby, the flat tube for heat exchangers which has several partition parts with a large section modulus and strong intensity | strength can be provided.
[0023]
According to the sixth aspect of the present invention, the pair of butting mold partitions 20 are formed at positions aligned with each other, and the notch 21 is formed on one of the tops 19. A flat tube for a heat exchanger having high strength can be provided by brazing the partition portions 20 together.
According to the seventh aspect of the present invention, the flat tubes 22 and the fins 23 are integrally brazed and fixed in a state where a large number of the flat tubes 22 and the fins 23 are assembled, and at the same time, the seams of the flat tubes 22 themselves. And it can be brazed and fixed between it and the 1st partition part 5 liquid-tightly. Thereby, the manufacturing method of a heat exchanger with high mass productivity can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of a flat tube for a heat exchanger according to the present invention.
FIG. 2 is an enlarged perspective view of a main part of the flat tube.
FIG. 3 is a main part perspective view showing a brazed state of a heat exchanger using the flat tube.
FIG. 4 is a cross-sectional view showing a second embodiment of a flat tube for a heat exchanger according to the present invention.
FIG. 5 is a cross-sectional view showing a third embodiment of a flat tube for a heat exchanger according to the present invention.
6 is an enlarged view of a VI part in FIG. 5;
FIG. 7 is a perspective view of a main part of the flat tube.
FIG. 8 is a transverse sectional view showing a fourth embodiment of a flat tube for a heat exchanger according to the present invention.
FIG. 9 is a perspective view of an essential part of a butt partition 20 of the flat tube.
FIG. 10 is a transverse sectional view showing a fifth embodiment of a flat tube for a heat exchanger according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flat surface part 2 Curved surface part 3 Brazing material 4 Top part 5 1st partition part 6 Edge part 7 L-shaped edge part 8 Edge part 9 End part folding | turning part
10 Top
11 Tip surface
12 Tip surface
13 Space
14 Top
15 Second divider
16 Top
17 Third partition
18 Window
19 Top
20 Butt type partition
21 cut
22 Flat tube
23 Fins

Claims (7)

帯状金属板をその幅方向に曲折して、一対の平行に対向する平坦面部(1) と、その両端間が連結される一対の湾曲面部(2) とにより、偏平な筒状に形成されてなる熱交換器用偏平チューブにおいて、
前記帯状金属板は、一方の平面のみにろう材(3)が被覆されたものが用いられ、そのろう材(3) が前記筒状の外面側に位置するように曲折形成され、その一方側の平坦面部(1) の幅方向の中間位置で、その対向する平坦面部(1)側へ折り返し曲折されて、その頂部(4) が対向側の平坦面部(1) の内面に接触し且つ、その折り返しの前記外面側が互いに略全平面で接触して、第１の仕切部(5) が形成され、
前記帯状金属板の一方の縁部(6) が、その第１の仕切部(5) の頂部(4) を越えてそれが巻き込まれるように、その第１の仕切部(5) の高さより短く断面Ｌ字状に折り曲げられてそこにＬ字状端部(7) が形成されると共に、その内面が前記第１の仕切部(5) に隣接して重ね合わされ、
前記帯状金属板の他方の縁部(8)の外面が、前記Ｌ字状端部(7) の外面に接触するように折り曲げられて、その先端部がＬ字状端部(7) よりも長く延在して、そのろう材(3) が第１の仕切部(5) の内面側に近接して対向しまたは、接触し、
その近接して対向しまたは、接触したろう材(3)が溶融し、第１の仕切り(5)と前記Ｌ字状端部(7)との間にそれが浸入して、それらの間が接合されることを特徴とする熱交換器用偏平チューブ。The belt-shaped metal plate is bent in the width direction, and is formed into a flat cylindrical shape by a pair of parallel facing flat surface portions (1) and a pair of curved surface portions (2) connected between both ends thereof. In the flat tube for heat exchanger
The band-shaped metal plate is used in which only one plane is coated with the brazing material (3), and the brazing material (3) is bent so that the brazing material (3) is positioned on the cylindrical outer surface side, and one side thereof At the intermediate position in the width direction of the flat surface portion (1) of the flat surface portion (1) is folded back to the opposite flat surface portion (1) side, the top (4) is in contact with the inner surface of the flat surface portion (1) on the opposite side, and The outer surface sides of the folds are in contact with each other in substantially the entire plane to form a first partition (5),
From the height of the first partition (5), one edge (6) of the strip-shaped metal plate is wound over the top (4) of the first partition (5). It is bent into a short L-shaped section to form an L-shaped end (7) there, and its inner surface is superposed adjacent to the first partition (5),
The outer surface of the other edge portion (8) of the strip-shaped metal plate is bent so as to contact the outer surface of the L-shaped end portion (7), and the tip portion thereof is more than the L-shaped end portion (7). It extends for a long time, and its brazing material (3) faces or contacts the inner surface of the first partition (5).
The brazing material (3) facing or in close proximity melts and enters between the first partition (5) and the L-shaped end (7). A flat tube for a heat exchanger characterized by being joined . 請求項１において、
前記Ｌ字状端部(7) に重ね合わされる前記他方の縁部(8) の先端部がそのＬ字状端部(7) よりも長く延在し、その部分が前記第１の仕切部(5) の側に折り返されて端部折り返し部(9) が形成され、その端部折り返し部(9) の頂部(10)が、前記一方側の前記平坦面部(1) の内面に接触すると共に、その折り返しの先端面(11)と前記Ｌ字状端部(7) の先端面(12)との間に空間部(13)が形成された熱交換器用偏平チューブ。In claim 1,
The tip of the other edge portion (8) superimposed on the L-shaped end portion (7) extends longer than the L-shaped end portion (7), and that portion is the first partition portion. (5) is folded back to form an end folded portion (9), and the top (10) of the end folded portion (9) contacts the inner surface of the flat surface portion (1) on the one side. In addition, a flat tube for a heat exchanger in which a space portion (13) is formed between the folded tip surface (11) and the tip surface (12) of the L-shaped end portion (7). 請求項２において、
Ｌ字状端部(7) の交角αが鋭角に形成され、それに整合して接触するように前記第１の仕切部(5) および端部折り返し部(9) が前記平坦面部(1) に対して傾斜して曲折形成された熱交換器用偏平チューブ。In claim 2,
The intersecting angle α of the L-shaped end portion (7) is formed at an acute angle, and the first partition portion (5) and the end turn-up portion (9) are arranged on the flat surface portion (1) so as to align and contact with each other. A flat tube for a heat exchanger that is bent and formed to be inclined. 請求項１において、
前記Ｌ字状端部(7) に重ね合わされれる前記他方の縁部(8) の先端部がＬ字状端部(7) よりも長く延在し、その部分が前記第１の仕切部(5) の内面に接触するように、その板厚分だけ段付きに曲折された熱交換器用偏平チューブ。In claim 1,
The tip of the other edge (8) superimposed on the L-shaped end (7) extends longer than the L-shaped end (7), and that portion is the first partition ( 5) A flat tube for a heat exchanger that is bent in steps by the thickness of the plate so that it contacts the inner surface. 請求項１において、
前記第１の仕切部(5) から離間し、一方側の平坦面部(1) の幅方向の中間位置で、その対向する平坦面部(1) の側へ折り返し曲折されて、その頂部(14)が対向側の平坦面部(1) の内面に接触し且つ、その折り返しの前記外面側が互いに略全平面で接触して、第２の仕切部(15)が形成され、
その第２の仕切部(15)に隣接して、前記他方側の平坦面部(1) の幅方向の中間位置で、その対向する平坦面部側へ折り返し曲折されて、その頂部(16)が対向側の平坦面部１の内面に接触し且つ、その折り返しの前記外面側が互いに略全平面で接触して、第３の仕切部(17)が形成され、
その第２の仕切部(15)と第３の仕切部(17)との接触面にスリットまたは窓部(18)をその長手方向に断続的に形成し、そのスリットまたは窓部(18)から前記ろう材(3) が露出するように形成された熱交換器用偏平チューブ。In claim 1,
It is spaced apart from the first partition (5) and is folded back to the side of the opposing flat surface (1) at the intermediate position in the width direction of the flat surface (1) on one side, and the top (14) Are in contact with the inner surface of the flat surface portion (1) on the opposite side, and the outer surface sides of the folded back are in contact with each other in substantially the entire plane, thereby forming a second partition portion (15),
Adjacent to the second partition part (15), it is folded back to the opposite flat surface part side at the intermediate position in the width direction of the other flat surface part (1), and the top part (16) is opposed. A third partition portion (17) is formed by contacting the inner surface of the flat surface portion 1 on the side and contacting the outer surface sides of the folded portions with each other in substantially the entire plane.
A slit or window (18) is intermittently formed in the longitudinal direction on the contact surface between the second partition (15) and the third partition (17), and the slit or window (18) A flat tube for a heat exchanger formed so that the brazing material (3) is exposed. 請求項１において、
前記第１の仕切部(5) から離間し、一方側と他方側の平坦面部(1) の幅方向の中間の互いに整合する位置で、互いに対向する側へ折り返し曲折されて、その頂部(19)どうしが接触し且つ、夫々の折り返しの前記外面側が互いに略全平面で接触して、突き合わせ型仕切部（20）が形成され、
その突き合わされた一対の頂部(19)のうち一方に、ろう材漏出用の切目（21）が形成された熱交換器用偏平チューブ。In claim 1,
It is spaced apart from the first partition part (5) and is bent back to the opposite side at a position in the middle of the width direction of the flat surface part (1) on the one side and the other side to be opposed to each other. ) And the outer surface sides of the respective folds are in contact with each other in substantially all planes, and a butt-type partition (20) is formed,
A flat tube for a heat exchanger in which a notch (21) for brazing filler metal leakage is formed in one of the paired top portions (19). 請求項１〜請求項６のいずれかの偏平チューブを用いた熱交換器の製造方法において、
多数の前記偏平チューブ（22）を並列すると共に、各偏平チューブ（22）間にフィン(23)を配置して熱交換器またはそのコアを組み立てる工程と、
次に、その組立て体を高温の炉内に挿入して、前記偏平チューブ（22）に被覆されたろう材(3) を溶融し、ついで冷却固化することによりその偏平チューブ（22）とフィン(23)とを一体にろう付けすると共に、偏平チューブ（22）の継目およびそれと第１の仕切部(5) との間を液密にろう付け固定する工程と、
を具備する熱交換器の製造方法。In the manufacturing method of the heat exchanger using the flat tube in any one of Claims 1-6,
Assembling a heat exchanger or its core by arranging a large number of the flat tubes (22) in parallel and arranging fins (23) between the flat tubes (22);
Next, the assembly is inserted into a high-temperature furnace to melt the brazing material (3) coated on the flat tube (22), and then to cool and solidify the flat tube (22) and fins (23 ) And brazing and fixing the joint between the flat tube (22) and the first partition (5) in a liquid-tight manner;
The manufacturing method of the heat exchanger which comprises.
JP2001024055A 2001-01-31 2001-01-31 Flat tube for heat exchanger and method of manufacturing heat exchanger Expired - Fee Related JP4536273B2 (en)

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