JP2004333023A - Flat tube for aluminum heat exchanger - Google Patents

Flat tube for aluminum heat exchanger Download PDF

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Publication number
JP2004333023A
JP2004333023A JP2003130185A JP2003130185A JP2004333023A JP 2004333023 A JP2004333023 A JP 2004333023A JP 2003130185 A JP2003130185 A JP 2003130185A JP 2003130185 A JP2003130185 A JP 2003130185A JP 2004333023 A JP2004333023 A JP 2004333023A
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JP
Japan
Prior art keywords
flat
width direction
bent
flat surface
edges
Prior art date
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Pending
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JP2003130185A
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Japanese (ja)
Inventor
Takashi Igami
多加司 伊神
Takumi Murayama
匠 村山
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Toyo Radiator Co Ltd
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Toyo Radiator Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyo Radiator Co Ltd filed Critical Toyo Radiator Co Ltd
Priority to JP2003130185A priority Critical patent/JP2004333023A/en
Priority to EP04730112A priority patent/EP1630512A1/en
Priority to US10/555,155 priority patent/US20070034366A1/en
Priority to PCT/JP2004/006236 priority patent/WO2004099697A1/en
Priority to CNB200480012409XA priority patent/CN100398973C/en
Publication of JP2004333023A publication Critical patent/JP2004333023A/en
Pending legal-status Critical Current

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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

Abstract

<P>PROBLEM TO BE SOLVED: To improve the corrosion resistance of an inner face side, in a flat tube for an aluminum heat exchanger wherein a sacrifice anode material 2 is applied on an inner face side of a core material 1, and which has the approximately B-shaped cross-section formed by bending an aluminum strip material of which an outer face side is coated with a brazing filler metal 3, in the width direction. <P>SOLUTION: Both edge parts in the width direction, of the strip member is bent to an inner face side of the tube, and the edges are separated from a flat inner face. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、アルミニューム製熱交換器用偏平チューブであって、その断面がＢ字状に曲折されたものであり且つ、外面側にろう材が被覆されたものに関する。
【０００２】
【従来の技術】
横断面が偏平な略Ｂ字状に形成されたアルミニューム製熱交換器用偏平チューブは、図９の如く、その幅方向中央に仕切部７が立ち上げられ、その頂部が曲折された帯状材の継目部８に接続されたものである。その継目部８には、帯状材の両縁部が１８０°折り返されて内面側にろう材３を露出し、そのろう材３と仕切部７の頂部とが接触されている。
このような偏平チューブを高温の炉内に挿入し、ろう材３を溶融させ、次いでそれを冷却固化すると図１０の如く、仕切部７の頂部と継目部８との間がろう材３によりろう付け固定されるものである。また、このとき同時にフィン１１および図示しないチューブプレートとの間も一体にろう付け固定される。（例えば、特許文献１参照。）。
【０００３】
【特許文献１】
米国特許第５７６５６３４号明細書
【０００４】
【発明が解決しようとする課題】
上記のＢ型偏平チューブは、仕切部７の存在により耐圧性が高い特徴がある。
しかしながら、チューブ内面側の耐蝕性に欠ける欠点があることが判った。例えば、ラジエータにおいては、チューブ内面側にアルミニューム合金からなる犠牲陽極材を被覆し、耐蝕性を高めるものが知られている。ところが、チューブ外面側のろう材を用いて仕切部７とろう付けするため、その帯状材の幅方向両縁部を内面側に折り返すと、ろう材の溶融時にそのろう材３が図１０の如く折り返し端縁に保持され、それが犠牲陽極材に触れ、その触れた部分に腐蝕が進行し易くなることが判った。
【０００５】
その理由は、次の通りである。
これは犠牲陽極材２にろう材３が付着し加熱されると、犠牲陽極材２とろう材３とによりそこに新たなアルミニューム合金が生じ、その新たなアルミニューム合金の電位が芯材の電位に近くなるため、犠牲陽極効果が極めて弱くなり、そこが集中的に腐蝕するためである。
そこで本発明は、このような内面腐蝕の問題を解決するＢ型偏平チューブ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、芯材（１） の内面側に犠牲陽極材（２） が被覆されると共に、外面側にろう材（３） が被覆されたアルミニューム製の帯状材を幅方向に曲折して、互いに平行に対向する一対の第一の平坦面（４） と第二の平坦面（５） と、
両平坦面（４）（５）の幅方向両側間を連結する一対の湾曲部（６） と、
第一の平坦面（４） の幅方向中央に内側へそれに直交して折り返して立ち上げられた仕切部（７） と、
第二の平坦面（５） の幅方向中央位置で前記帯状材の両縁部どうしが折り曲げられて突き合わされると共に、その折り曲げ縁部が前記仕切部（７） に接続された継目部（８） と、
を有して横断面が偏平な略Ｂ字状にされたアルミニューム製熱交換器用偏平チューブにおいて、
前記帯状材の幅方向両縁部がチューブ内面側に曲折されると共に、その縁が前記第二の平坦面（５） の内面から離反されたアルミニューム製熱交換器用偏平チューブである。
【０００７】
請求項２に記載の本発明は、請求項１において、
前記幅方向両縁部が断面傘状に突き合わされるように形成され、その傘の頂部内面に前記仕切部（７） の頂部が接触されたアルミニューム製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、
前記両縁部の先端近傍に、凹陥したろう溜まり（９） が設けられたアルミニューム製熱交換器用偏平チューブである。
【０００８】
請求項４に記載の本発明は、請求項１において、
前記幅方向両縁部が第二の平坦面（５） に直交して折り曲げられた脚部（１３）を有すると共に、その先端縁が脚部（１３）より短くその第二の平坦面（５） 側に折り返され、その折り返し端縁が前記仕切部（７） の頂部に接触されたアルミニューム製熱交換器用偏平チューブである。
請求項５に記載の本発明は、請求項１において、
前記幅方向両縁部が第二の平坦面（５） に直交して折り曲げられた脚部（１３）を有すると共に、その先端縁がその第二の平坦面（５） にほぼ平行に折り曲げられ、その折り曲げ縁部が前記仕切部（７） の頂部に接触されたアルミニューム製熱交換器用偏平チューブである。
【０００９】
請求項６に記載の本発明は、芯材（１） の内面側に犠牲陽極材（２） が被覆されると共に、外面側にろう材（３） が被覆されたアルミニューム製の帯状材を幅方向に曲折して、互いに平行に対向された第一の平坦面（４） と第二の平坦面（５） と、
両平坦面（４）（５）の幅方向両側間を連結する一対の湾曲部（６） と、
第一の平坦面（４） の幅方向中央に内側へそれに直交して折り返して立ち上げられた仕切部（７） と、
第二の平坦面（５） の幅方向中央位置で前記帯状材の両縁部どうしが重ね合わされると共に、その重ね合わせ部が前記仕切部（７） に接続されて、横断面が偏平な略Ｂ字状にされたアルミニューム製熱交換器用偏平チューブにおいて、
前記帯状材の幅方向一方の縁部が前記第二の平坦面（５） 上に延在すると共に、他方の縁部が内面側にその板厚分だけ段付きに形成され且つ、その先端縁が前記段付きの中間まで折り返され、その折り返しの重ね合わせ部（１０）が前記仕切部（７） の頂部に接触されたアルミニューム製熱交換器用偏平チューブである。
【００１０】
【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偏平チューブであってろう付け前の横断面図であり、図２はそのろう付け後の要部横断説明図である。
この例は、アルミニューム製の帯状材を幅方向に曲折して形成したものであり、その帯状材はアルミニュームの芯材１の外面側にアルミニューム合金からなるろう材３が被覆されると共に、内面側にアルミニューム合金からなる犠牲陽極材２が予め被覆されたものである。
【００１１】
このような帯状材を幅方向に曲折して、互いに平行な第一の平坦面４と第二の平坦面５とが対向され、それらの幅方向両側部間が一対の湾曲部６で連結される。さらに第一の平坦面４の幅方向中央に、内側へそれに直交して仕切部７が折り返し形成され、第二の平坦面５の幅方向中央位置で帯状材の両縁部が内面側に折り返されて断面傘状に突き合わされ、その傘の頂部内面に仕切部７の頂部が接触されたものである。そして折り返された部分は、第二の平坦面５の内面に非接触状態にある。さらに折り返しの先端近傍には、凹陥した断面Ｖ字状のろう溜まり９が設けられている。
【００１２】
このような断面を有する多数の偏平チューブが、定間隔に並列され、各偏平チューブ間に図２の如くフィン１１が配置され、偏平チューブの長手方向両端には図示しないヘッダプレートのチューブ挿通孔が嵌着されてコアを構成し、そのコアの両側にサポート材が配置され熱交換器が組立てられる。
そして、組み立てられた熱交換器が高温の炉内に挿入され、各偏平チューブ外面のろう材３を溶融し、次いでそれを冷却固化することにより偏平チューブの継目部８および仕切部７の頂部並びにフィン１１との各接触部その他をろう付けするものである。このときチューブ内面側に露出されたろう材は、折り返し部と第二の平坦面５の内面との間に隙間が存在するため、犠牲陽極材２にろう材が付着することがない。また、ろう溜まり９の存在によりそこにろう材３が保持され、犠牲陽極材２側にろう材が移動することをより効果的に防止する。
【００１３】
次に、図３は本発明の第２の実施の形態を示す偏平チューブであって、図１のそれと異なる点は、折り曲げ部１４と第二の平坦面５との角度がより大きく形成されたことである。それによって、ろう材溶融時にそのろう材３が第二の平坦面５の内面側に付着することをより効果的に防止できるものである。
【００１４】
次に、図４は本発明の第３の実施の形態を示す偏平チューブであって、この例は継目部８の折り曲げ部１４が第二の平坦面５に対して、一旦、１８０°に折り返され、次いで、その先端縁が第二の平坦面５の内面から離反するように内面側に傾斜されたものである。このようにすることにより、ろう材溶融時にそれが第二の平坦面５の内面側に付着することを防止できる。
【００１５】
次に、図５は本発明の第４の実施の形態を示す偏平チューブであって、この例は帯状材が継目部８で第二の平坦面５に対し直角に折り曲げられて、そこに一対の脚部１３が接触して配置され、その先端が脚部１３の長さよりも短くさらに折り返されたものである。このようにすることにより、チューブ外面側のろう材が溶融しても第二の平坦面５の内面側にはそれが達しないようにしたものである。仮に脚部１３にろう材が僅かに付着しても、そこの部分はチューブの漏れとは無関係であるため、耐蝕性に影響を与えない。
【００１６】
次に、図６は本発明の第５の実施の形態を示す偏平チューブであって、この例が図５のそれと異なる点は、脚部１３の先端部が第二の平坦面５に平行に折り曲げられたことである。そしてその折り曲げ縁部が仕切部７に接触したものである。この例も、ろう材溶融時にそれが第二の平坦面５の内面側の犠牲陽極材２に付着するとこがない。
【００１７】
次に、図７は本発明の第６の実施の形態を示す偏平チューブであって、この例は帯状材の一方の縁が第二の平坦面５の平面上に延在し、他方の縁が板厚分だけ段付きに形成され、その縁部がさらに１８０°曲折され、その折り返し部の長さが段付きより短く形成されたものである。そしてその重ね合わせ部１０が仕切部７の頂部に接触するものである。この場合、第二の平坦面５における継目のろう付け部は三重に形成され、その分だけ腐蝕に強いものとなる。
【００１８】
次に、図８は本発明の第７の実施の形態を示す偏平チューブであって、この例は帯状材の一方の縁部が板厚の２倍の段付き状に形成され、他方の縁部が１８０°折り返されると共に、その縁が第二の平坦面５の内面から離反するように曲折されたものである。そして仕切部７の頂部に適宜間隔で切れ目１２が形成され、そこから仕切部７の外面側のろう材３が流出し、第二の平坦面５の一方の縁部のカギ型折り曲げ部１５と仕切部７の頂部とがろう付けされる。また、帯状材の両縁部は、それらの外面側に被覆されたろう材により互いにろう付けされる。
【００１９】
【発明の作用・効果】
本発明の偏平チューブは、芯材１の内面側に犠牲陽極材２が被覆され、外面側にろう材３が被覆されたアルミニューム製のものであって、その継目部８における帯状材の両縁部がチューブ内面側に曲折されると共に、その縁が第二の平坦面５から離反されたものである。そのため、ろう付け時に溶融したろう材が第二の平坦面５の内面の犠牲陽極材２に付着することを防止し、その付着に基づく内面腐蝕を防止して信頼性の高い偏平チューブを提供できる。
【００２０】
上記構成において、材料となる帯状材の幅方向両縁部を断面傘状になるように突き合わせ形成し、その傘の頂部内面に仕切部７の頂部を接触させて偏平チューブを構成することができる。この場合には、成形が容易で且つ内面側の耐蝕性の高いものとなり得る。
上記構成において、その両縁部の先端近傍に凹陥したろう溜まり９を設けることができる。その場合には、ろう溜まり９の存在により、溶融したろう材をそのろう溜まり９に保持して、犠牲陽極材２にろう材が付着することをより確実に防止できる。
【００２１】
上記第１の発明において、幅方向両縁部を第二の平坦面５に直交して折り曲げそこに脚部１３を形成し、さらにその先端縁を脚部１３より短く折り返し曲折し、その折り返し端縁部を仕切部７の頂部に接触させることができる。この場合にも、折り返し部が脚部１３より短いため、溶融したろう材が第二の平坦面５の犠牲陽極材２まで達することを防止し、耐久性の高い偏平チューブを提供できる。
【００２２】
上記第１の発明において、帯状材の両端縁部を第二の平坦面５に直角に折り曲げて脚部１３を形成し、その先端部を第二の平坦面５にほぼ平行に折り曲げ、その折り曲げ縁部を仕切部７の頂部に接触させることができる。この場合には、脚部１３の存在により、ろう材溶融時にそれが第二の平坦面５の犠牲陽極材２に付着することをさらに防止し、信頼性の高い偏平チューブを提供できる。
【００２３】
また、帯状材の幅方向両縁部を重ね合わせると共に、一方側を板厚分だけ段付き状に形成し、さらにその端縁を段付き部の中間まで折り返し、その折り返しの重ね合わせ部１０を仕切部７の頂部に接触させることができる。この場合にも、ろう材の溶融時に第二の平坦面５の犠牲陽極材２までろう材が達することを有効に防止し、耐久性の高い偏平チューブを提供できる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態の偏平チューブであってろう付け前の状態を示す横断面図。
【図２】同偏平チューブのろう付け後の状態を示す要部横断面図。
【図３】本発明の第２の実施の形態の偏平チューブを示す要部横断面図。
【図４】同第３の実施の形態の偏平チューブを示す要部横断面図。
【図５】同第４の実施の形態の偏平チューブを示す要部横断面図。
【図６】同第５の実施の形態の偏平チューブを示す要部横断面図。
【図７】同第６の実施の形態の偏平チューブを示す要部横断面図。
【図８】同第７の実施の形態の偏平チューブを示す要部横断面図。
【図９】従来型偏平チューブであってろう付け前の状態を示す横断面図。
【図１０】同偏平チューブのろう付け後の状態を示す要部横断面図。
【符号の説明】
１ 芯材
２ 犠牲陽極材
３ ろう材
４ 第一の平坦面
５ 第二の平坦面
６ 湾曲部
７ 仕切部
８ 継目部
９ ろう溜まり
１０ 重ね合わせ部
１１ フィン
１２ 切れ目
１３ 脚部
１４ 折り曲げ部
１５ カギ型折り曲げ部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flat tube for an aluminum heat exchanger, the cross section of which is bent in a B-shape, and the outer surface of which is coated with a brazing material.
[0002]
[Prior art]
As shown in FIG. 9, a flat tube for an aluminum heat exchanger having a flat cross section formed in a substantially B-shape is provided with a partition 7 at the center in the width direction, and a top of the strip is bent. It is connected to the joint 8. Both edges of the band-shaped material are folded back by 180 ° at the joint portion 8 to expose the brazing material 3 on the inner surface side, and the brazing material 3 and the top of the partition 7 are in contact with each other.
When such a flat tube is inserted into a high-temperature furnace, and the brazing material 3 is melted and then cooled and solidified, the brazing material 3 fills the gap between the top of the partition 7 and the seam 8 as shown in FIG. It is attached and fixed. At this time, the fin 11 and the tube plate (not shown) are also integrally brazed and fixed. (For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
US Pat. No. 5,765,634.
[Problems to be solved by the invention]
The B-type flat tube described above is characterized by high pressure resistance due to the presence of the partition 7.
However, it was found that there was a defect that the inner surface of the tube lacked corrosion resistance. For example, in a radiator, there is known a radiator in which a sacrificial anode material made of an aluminum alloy is coated on an inner surface side of a tube to improve corrosion resistance. However, in order to braze to the partition part 7 using the brazing material on the outer surface side of the tube, when both widthwise edges of the band-shaped material are folded back to the inner surface side, the brazing material 3 is melted as shown in FIG. It was held at the folded edge, which touched the sacrificial anode material, and it was found that corrosion easily progressed to the touched portion.
[0005]
The reason is as follows.
This is because when the brazing material 3 adheres to the sacrificial anode material 2 and is heated, a new aluminum alloy is generated there by the sacrificial anode material 2 and the brazing material 3, and the potential of the new aluminum alloy is reduced to the potential of the core material. This is because the potential becomes close to the electric potential, so that the sacrificial anode effect becomes extremely weak, and there is intensive corrosion.
Therefore, an object of the present invention is to provide a B-type flat tube that solves such a problem of inner surface corrosion.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a strip made of aluminum, in which a core material (1) is coated with a sacrificial anode material (2) on the inner surface and a brazing material (3) is coated on the outer surface. A pair of first flat surfaces (4) and second flat surfaces (5) bent in the width direction and facing each other in parallel;
A pair of curved portions (6) connecting between both widthwise sides of both flat surfaces (4) and (5);
A partition portion (7) which is folded inward at the center in the width direction of the first flat surface (4) inward and perpendicular to the first flat surface (4);
At the center in the width direction of the second flat surface (5), both edges of the band-shaped material are bent and abutted, and the bent edges are connected to the seam (8) connected to the partition (7). ) When,
In a flat tube for an aluminum heat exchanger having a substantially B-shaped cross section having a flat cross section,
A flat tube for an aluminum heat exchanger in which both edges in the width direction of the strip are bent toward the inner surface of the tube, and the edges are separated from the inner surface of the second flat surface (5).
[0007]
The present invention described in claim 2 is based on claim 1,
A flat tube for an aluminum heat exchanger in which both edges in the width direction are formed so as to abut each other in an umbrella shape in cross section, and the top of the partition (7) is in contact with the inner surface of the top of the umbrella.
The present invention described in claim 3 is the invention according to claim 2,
A flat tube for an aluminum heat exchanger provided with a recessed solder pool (9) near the ends of the both edge portions.
[0008]
The present invention described in claim 4 is based on claim 1,
Both edges in the width direction have legs (13) bent perpendicularly to the second flat surface (5), and the leading edge is shorter than the legs (13). The flat tube for an aluminum heat exchanger is folded back to the side, and its folded edge is in contact with the top of the partition (7).
The present invention described in claim 5 is based on claim 1,
Both edges in the width direction have legs (13) bent at right angles to the second flat surface (5), and the leading edge is bent substantially parallel to the second flat surface (5). A flat tube for an aluminum heat exchanger, the bent edge of which is in contact with the top of the partition (7).
[0009]
According to a sixth aspect of the present invention, there is provided an aluminum band-shaped material in which a sacrificial anode material (2) is coated on an inner surface of a core material (1) and a brazing material (3) is coated on an outer surface. A first flat surface (4) and a second flat surface (5) bent in the width direction and opposed to each other in parallel with each other;
A pair of curved portions (6) connecting between both widthwise sides of both flat surfaces (4) and (5);
A partition portion (7) which is folded inward at the center in the width direction of the first flat surface (4) inward and perpendicular to the first flat surface (4);
At the center in the width direction of the second flat surface (5), both edges of the band-shaped material are overlapped, and the overlapped portion is connected to the partition (7), and the cross section is substantially flat. In a B-shaped flat tube for aluminum heat exchanger,
One edge in the width direction of the band-shaped material extends on the second flat surface (5), and the other edge is formed on the inner surface side with a step by the thickness thereof, and the leading edge is formed. Is a flat tube for an aluminum heat exchanger in which the folded part (10) is folded back to the middle of the step and the folded part (10) is in contact with the top of the partition part (7).
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a flat tube according to a first embodiment of the present invention before brazing, and FIG. 2 is an explanatory cross-sectional view of main parts after brazing.
In this example, an aluminum strip is bent in the width direction, and the outer face of an aluminum core 1 is covered with a brazing material 3 made of an aluminum alloy. The sacrificial anode material 2 made of an aluminum alloy is previously coated on the inner surface side.
[0011]
Such a band-shaped material is bent in the width direction, and the first flat surface 4 and the second flat surface 5 parallel to each other are opposed to each other, and the both sides in the width direction are connected by a pair of curved portions 6. You. Further, at the center in the width direction of the first flat surface 4, a partition portion 7 is formed to be folded back inward and orthogonal to the first flat surface 4. The umbrella is abutted in an umbrella shape in cross section, and the top of the partition 7 is in contact with the inner surface of the top of the umbrella. The folded portion is in a non-contact state with the inner surface of the second flat surface 5. Further, a recessed V-shaped solder pool 9 having a V-shaped cross section is provided in the vicinity of the leading end of the turn.
[0012]
A large number of flat tubes having such a cross section are arranged in parallel at regular intervals, fins 11 are arranged between the flat tubes as shown in FIG. 2, and tube insertion holes of a header plate (not shown) are provided at both longitudinal ends of the flat tubes. The cores are fitted to each other, the support members are arranged on both sides of the cores, and the heat exchanger is assembled.
Then, the assembled heat exchanger is inserted into the high-temperature furnace, and the brazing material 3 on the outer surface of each flat tube is melted, and then cooled and solidified to form the top of the seam portion 8 and the partition portion 7 of the flat tube, and Each contact portion with the fin 11 and others are brazed. At this time, the brazing material exposed on the inner surface side of the tube does not adhere to the sacrificial anode material 2 because there is a gap between the folded portion and the inner surface of the second flat surface 5. Further, the brazing material 3 is held there by the existence of the brazing pool 9, and the brazing material is more effectively prevented from moving to the sacrificial anode material 2 side.
[0013]
Next, FIG. 3 shows a flat tube according to a second embodiment of the present invention, which is different from that of FIG. 1 in that the angle between the bent portion 14 and the second flat surface 5 is larger. That is. Thereby, it is possible to more effectively prevent the brazing material 3 from adhering to the inner side of the second flat surface 5 when the brazing material is melted.
[0014]
Next, FIG. 4 shows a flat tube according to a third embodiment of the present invention. In this example, the bent portion 14 of the seam portion 8 is once folded 180 ° with respect to the second flat surface 5. Then, the tip edge is inclined toward the inner surface so that the leading edge is separated from the inner surface of the second flat surface 5. By doing so, it is possible to prevent the brazing material from adhering to the inner surface side of the second flat surface 5 when the brazing material is melted.
[0015]
Next, FIG. 5 shows a flat tube according to a fourth embodiment of the present invention. In this example, a band-like material is bent at a seam portion 8 at a right angle to the second flat surface 5, and a pair thereof is formed there. Are arranged in contact with each other, and the tip of the leg 13 is shorter than the length of the leg 13 and further folded back. By doing so, even if the brazing material on the outer surface side of the tube is melted, it does not reach the inner surface side of the second flat surface 5. Even if the brazing material slightly adheres to the leg portion 13, the portion is not related to the leakage of the tube, and thus does not affect the corrosion resistance.
[0016]
Next, FIG. 6 shows a flat tube according to a fifth embodiment of the present invention, which is different from that of FIG. 5 in that the tip of the leg 13 is parallel to the second flat surface 5. It was folded. The bent edge portion comes into contact with the partition 7. Also in this example, when the brazing material is melted, it does not adhere to the sacrificial anode material 2 on the inner side of the second flat surface 5.
[0017]
Next, FIG. 7 shows a flat tube according to a sixth embodiment of the present invention, in which one edge of the strip extends on the plane of the second flat surface 5 and the other edge thereof. Is formed stepped by the plate thickness, the edge thereof is further bent by 180 °, and the length of the folded portion is formed shorter than the step. The overlapping portion 10 comes into contact with the top of the partition 7. In this case, the brazing portion of the seam on the second flat surface 5 is formed in three layers, and the portion is more resistant to corrosion.
[0018]
Next, FIG. 8 shows a flat tube according to a seventh embodiment of the present invention. In this example, one edge portion of the strip material is formed in a stepped shape twice as thick as the plate thickness, and the other edge portion is formed. The portion is folded back by 180 ° and the edge is bent so as to be separated from the inner surface of the second flat surface 5. Cuts 12 are formed at appropriate intervals at the top of the partition 7, from which the brazing material 3 on the outer surface side of the partition 7 flows out, and a key-shaped bent portion 15 on one edge of the second flat surface 5. The top of the partition 7 is brazed. Also, both edges of the strip are brazed to each other by a brazing material coated on their outer surfaces.
[0019]
[Action and Effect of the Invention]
The flat tube of the present invention is made of aluminum in which a sacrificial anode material 2 is coated on an inner surface of a core material 1 and a brazing material 3 is coated on an outer surface thereof. The edge is bent toward the inner surface of the tube, and the edge is separated from the second flat surface 5. Therefore, it is possible to prevent the brazing material melted at the time of brazing from adhering to the sacrificial anode material 2 on the inner surface of the second flat surface 5 and to prevent the inner surface corrosion due to the adhesion, thereby providing a highly reliable flat tube. .
[0020]
In the above configuration, a flat tube can be formed by abutting the width-direction edges of the band-shaped material as a material so as to have an umbrella-shaped cross section, and bringing the top of the partition portion 7 into contact with the inner surface of the top of the umbrella. . In this case, molding can be easily performed and the inner surface side can have high corrosion resistance.
In the above-described configuration, a recessed solder pool 9 can be provided in the vicinity of the front ends of both edges. In that case, the presence of the brazing pool 9 holds the molten brazing material in the brazing pool 9 and can more reliably prevent the brazing material from adhering to the sacrificial anode material 2.
[0021]
In the first aspect, both edges in the width direction are bent perpendicular to the second flat surface 5 to form leg portions 13, and further, the leading edge thereof is folded back shorter than the leg portions 13, and the folded ends thereof are formed. The edge can be brought into contact with the top of the partition 7. Also in this case, since the folded portion is shorter than the leg portion 13, the molten brazing material is prevented from reaching the sacrificial anode material 2 on the second flat surface 5, and a highly durable flat tube can be provided.
[0022]
In the first invention, both edges of the strip are bent at right angles to the second flat surface 5 to form the leg portion 13, and the tip portion is bent substantially parallel to the second flat surface 5, and the bent portion is formed. The edge can be brought into contact with the top of the partition 7. In this case, the presence of the leg portion 13 further prevents the solder material from adhering to the sacrificial anode material 2 on the second flat surface 5 when the brazing material is melted, so that a highly reliable flat tube can be provided.
[0023]
In addition, both edges in the width direction of the band-shaped material are overlapped, and one side is formed in a stepped shape by the thickness of the plate, and the end edge is folded back to the middle of the stepped portion. The top of the partition 7 can be brought into contact. Also in this case, it is possible to effectively prevent the brazing material from reaching the sacrificial anode material 2 on the second flat surface 5 when the brazing material is melted, and to provide a flat tube having high durability.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a flat tube according to a first embodiment of the present invention, showing a state before brazing.
FIG. 2 is a cross-sectional view of a main part showing a state of the flat tube after brazing.
FIG. 3 is a main part cross-sectional view showing a flat tube according to a second embodiment of the present invention.
FIG. 4 is an essential part cross sectional view showing the flat tube of the third embodiment.
FIG. 5 is an essential part cross sectional view showing the flat tube of the fourth embodiment.
FIG. 6 is an essential part cross sectional view showing the flat tube of the fifth embodiment.
FIG. 7 is an essential part cross sectional view showing the flat tube of the sixth embodiment.
FIG. 8 is an essential part cross sectional view showing the flat tube of the seventh embodiment.
FIG. 9 is a cross-sectional view of a conventional flat tube before brazing.
FIG. 10 is a cross-sectional view of a main part showing a state of the flat tube after brazing.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 core material 2 sacrificial anode material 3 brazing material 4 first flat surface 5 second flat surface 6 curved portion 7 partition portion 8 seam portion 9 solder pool 10 overlapping portion 11 fin 12 cut 13 leg portion 14 bent portion 15 key Mold bending part

Claims (6)

芯材（１） の内面側に犠牲陽極材（２） が被覆されると共に、外面側にろう材（３） が被覆されたアルミニューム製の帯状材を幅方向に曲折して、互いに平行に対向する一対の第一の平坦面（４） と第二の平坦面（５） と、
両平坦面（４）（５）の幅方向両側間を連結する一対の湾曲部（６） と、
第一の平坦面（４） の幅方向中央に内側へそれに直交して折り返して立ち上げられた仕切部（７） と、
第二の平坦面（５） の幅方向中央位置で前記帯状材の両縁部どうしが折り曲げられて突き合わされると共に、その折り曲げ縁部が前記仕切部（７） に接続された継目部（８） と、
を有して横断面が偏平な略Ｂ字状にされたアルミニューム製熱交換器用偏平チューブにおいて、
前記帯状材の幅方向両縁部がチューブ内面側に曲折されると共に、その縁が前記第二の平坦面（５） の内面から離反されたアルミニューム製熱交換器用偏平チューブ。A sacrificial anode material (2) is coated on the inner surface of the core material (1), and an aluminum band material coated on the outer surface with a brazing material (3) is bent in the width direction to be parallel to each other. A pair of opposing first flat surfaces (4) and second flat surfaces (5);
A pair of curved portions (6) connecting between both widthwise sides of both flat surfaces (4) and (5);
A partition portion (7) which is folded inward at the center in the width direction of the first flat surface (4) inward and perpendicular to the first flat surface (4);
At the center in the width direction of the second flat surface (5), both edges of the band-shaped material are bent and abutted, and the bent edges are connected to the seam (8) connected to the partition (7). ) When,
In a flat tube for an aluminum heat exchanger having a substantially B-shaped cross section having a flat cross section,
A flat tube for an aluminum heat exchanger, wherein both edges in the width direction of the strip are bent toward the inner surface of the tube, and the edges are separated from the inner surface of the second flat surface (5). 請求項１において、
前記幅方向両縁部が断面傘状に突き合わされるように形成され、その傘の頂部内面に前記仕切部（７） の頂部が接触されたアルミニューム製熱交換器用偏平チューブ。In claim 1,
A flat tube for an aluminum heat exchanger in which both edges in the width direction are formed so as to abut each other in an umbrella-shaped cross section, and the top of the partition (7) is in contact with the inner surface of the top of the umbrella. 請求項２において、
前記両縁部の先端近傍に、凹陥したろう溜まり（９） が設けられたアルミニューム製熱交換器用偏平チューブ。In claim 2,
A flattened tube for an aluminum heat exchanger, wherein a concave solder pool (9) is provided in the vicinity of the tip of the both edges. 請求項１において、
前記幅方向両縁部が第二の平坦面（５） に直交して折り曲げられた脚部（１３）を有すると共に、その先端縁が脚部（１３）より短くその第二の平坦面（５） 側に折り返され、その折り返し端縁が前記仕切部（７） の頂部に接触されたアルミニューム製熱交換器用偏平チューブ。In claim 1,
Both edges in the width direction have legs (13) bent perpendicularly to the second flat surface (5), and the leading edge is shorter than the legs (13). A flat tube for an aluminum heat exchanger whose side is folded back and whose folded edge is in contact with the top of the partition (7). 請求項１において、
前記幅方向両縁部が第二の平坦面（５） に直交して折り曲げられた脚部（１３）を有すると共に、その先端縁がその第二の平坦面（５） にほぼ平行に折り曲げられ、その折り曲げ縁部が前記仕切部（７） の頂部に接触されたアルミニューム製熱交換器用偏平チューブ。In claim 1,
Both edges in the width direction have legs (13) bent at right angles to the second flat surface (5), and the leading edge is bent substantially parallel to the second flat surface (5). A flat tube for an aluminum heat exchanger, the bent edge of which is in contact with the top of the partition (7). 芯材（１） の内面側に犠牲陽極材（２） が被覆されると共に、外面側にろう材（３） が被覆されたアルミニューム製の帯状材を幅方向に曲折して、互いに平行に対向された第一の平坦面（４） と第二の平坦面（５） と、
両平坦面（４）（５）の幅方向両側間を連結する一対の湾曲部（６） と、
第一の平坦面（４） の幅方向中央に内側へそれに直交して折り返して立ち上げられた仕切部（７） と、
第二の平坦面（５） の幅方向中央位置で前記帯状材の両縁部どうしが重ね合わされると共に、その重ね合わせ部が前記仕切部（７） に接続されて、横断面が偏平な略Ｂ字状にされたアルミニューム製熱交換器用偏平チューブにおいて、
前記帯状材の幅方向一方の縁部が前記第二の平坦面（５） 上に延在すると共に、他方の縁部が内面側にその板厚分だけ段付きに形成され且つ、その先端縁が前記段付きの中間まで折り返され、その折り返しの重ね合わせ部（１０）が前記仕切部（７） の頂部に接触されたアルミニューム製熱交換器用偏平チューブ。A sacrificial anode material (2) is coated on the inner surface of the core material (1), and an aluminum band material coated on the outer surface with a brazing material (3) is bent in the width direction to be parallel to each other. Opposing first flat surface (4) and second flat surface (5);
A pair of curved portions (6) connecting between both widthwise sides of both flat surfaces (4) and (5);
A partition portion (7) which is folded inward at the center in the width direction of the first flat surface (4) inward and perpendicular to the first flat surface (4);
At the center in the width direction of the second flat surface (5), both edges of the band-shaped material are overlapped, and the overlapped portion is connected to the partition (7), and the cross section is substantially flat. In a B-shaped flat tube for aluminum heat exchanger,
One edge in the width direction of the band-shaped material extends on the second flat surface (5), and the other edge is formed on the inner surface side with a step by the thickness thereof, and the leading edge is formed. Is folded back to the middle of the step, and the folded overlapped portion (10) is in contact with the top of the partition (7) to form a flat tube for an aluminum heat exchanger.
JP2003130185A 2003-05-08 2003-05-08 Flat tube for aluminum heat exchanger Pending JP2004333023A (en)

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EP04730112A EP1630512A1 (en) 2003-05-08 2004-04-28 Flat tube for aluminium heat exchanger
US10/555,155 US20070034366A1 (en) 2003-05-08 2004-04-28 Aluminum flat tube for heat exchanger
PCT/JP2004/006236 WO2004099697A1 (en) 2003-05-08 2004-04-28 Flat tube for aluminium heat exchanger
CNB200480012409XA CN100398973C (en) 2003-05-08 2004-04-28 Flat tube for aluminium heat exchanger

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JP2007198623A (en) * 2006-01-24 2007-08-09 Denso Corp Heat exchanger

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KR100624372B1 (en) * 2004-07-27 2006-09-20 엘지전자 주식회사 The metod for preventing corrosion of pin of the heat exchznger

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EP1630512A1 (en) 2006-03-01
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CN100398973C (en) 2008-07-02
US20070034366A1 (en) 2007-02-15

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