JP4207192B2 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
JP4207192B2
JP4207192B2 JP2003054603A JP2003054603A JP4207192B2 JP 4207192 B2 JP4207192 B2 JP 4207192B2 JP 2003054603 A JP2003054603 A JP 2003054603A JP 2003054603 A JP2003054603 A JP 2003054603A JP 4207192 B2 JP4207192 B2 JP 4207192B2
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Japan
Prior art keywords
header
tube insertion
insertion hole
tube
brazing material
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JP2004263938A (en
Inventor
和彦 遊佐
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T.RAD CO., L T D.
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding

Description

【０００１】
【発明の属する技術分野】
本発明は、ヘッダと多数のチューブとを有するアルミニューム製熱交換器に関し、特に、横断面略Ｂ字状の偏平チューブとそれが挿通されるヘッダのチューブ挿通孔とのろう付け構造に関する。
【０００２】
【従来の技術】
従来から、自動車用のラジエータや空調機として使用されるアルミニューム製熱交換器は、一対のヘッダと多数の偏平チューブおよびフィンとを有する。そのヘッダには、ろう付け性を考慮して、偏平チューブとの接合面にろう材がクラッドされたブレージングシートが用いられている。また、近年はヘッダをベア（ろう付けシートなし）とし、チューブとの接合部位のみにろう材を配置する方法も行われている。
【０００３】
さらに偏平チューブとヘッダとのろう付け性を向上させるため、ろう材がクラッドされたヘッダの表面またはろう材が配置されるヘッダの表面に、複数の小溝を成形しその小溝を介して、溶融したろう材をチューブ挿通孔に導く提案がなされている（例えば、特許文献１。）。
この小溝はチューブ孔から比較的離れた位置のろう付けをチューブ挿通孔に導くものであり、少ないろう材のクラッド量でも良好なろう付け性を確保しようとするものである。
【０００４】
【特許文献１】
特開２００２−２７７１８７号公報（特許請求の範囲および第３図）
【０００５】
【発明が解決しようとする課題】
このようにヘッダに複数の小溝をヘッダの長手方向に平行に配置するのは、ろう付けの際、溶融したろう材を毛細管現象を利用して小溝からチューブ挿通孔に導くためである。
ところが、本発明者の実験によれば、偏平チューブとして図１に示すような断面略Ｂ字状の管をヘッダのチューブ挿通孔に挿通すると、多数の小溝を設けても、その継目にろう材が集中し、その分だけ他の部分にろう材が充分回らず、ろう付け不良を起こすことが判った。
【０００６】
そこで本発明は、横断面略Ｂ字状の偏平チューブにおいて、ろう付けの際に継目部にろう材が集中することなく全体にろう材が回り、偏平チューブの端部とヘッダチューブのチューブ挿通孔との間の均一なろう付けが行なわれるようにすることを課題とする。
【０００７】
【課題を解決するための手段】
本発明は、長手方向に互いに離間して、多数の偏平なチューブ挿通孔(1) が並列され、外面側にろう材(2) がクラッドされまたは、ろう材が付着される一対の細長いヘッダ(3) と、
夫々の前記チューブ挿通孔(1) に、両端部が挿通された多数の偏平チューブ(4) と、を具備し、
前記偏平チューブ(4) は、帯状金属板を幅方向に曲折して、その両縁部を重ね合わせた継目(5) が、その中心線に平行に形成されたものからなり、
前記ヘッダ(3) には、チューブ挿通孔(1) 側の外面で、その幅方向に互いに離間して多数のろう材誘導用の微細溝(6) が夫々長手方向に平行に形成されると共に、それらが前記チューブ挿通孔(1) の縁に達するように且つ、その微細溝(6) は前記偏平チューブ(4) の前記継目(5) の位置から外れた位置にのみ形成され、ヘッダ(3) 外面の前記ろう材(2) を溶融して、前記微細溝(6) を介して前記チューブ挿通孔(1) に導くことにより、そのチューブ挿通孔(1) と偏平チューブ(4) 外面との間を液密にろう付けしたことを特徴とする熱交換器である。
【０００８】
【発明の実施の形態】
次に、図面に基づいて本発明の実施の形態につき説明する。
図１は本発明の熱交換器の要部横断面拡大図であって、図２のＩ−Ｉ矢視断面拡大図である。また、図２は同熱交換器の正面図、図３は図１の III− III矢視断面の更なる拡大図、図４は図１のIV−IV矢視断面図である。
この熱交換器は、図１に示す如く、左右に一対のヘッダ３が配置され（上下の場合もある。）、夫々のヘッダ３に多数の偏平なチューブ挿通孔が、その長手方向に離間して並列配置されている。そして夫々のチューブ挿通孔に偏平チューブ４の両端が挿通され、隣接する偏平チューブ４間にコルゲートフィン７が配置されている。
【０００９】
この偏平チューブ４は図１に示す如く、横断面が略Ｂ字状に形成されている。このような偏平チューブ４は、外面側にろう材がクラッドられた帯状金属板をその幅方向に曲折形成し且つ、その両端縁をＬ字状に形成し、その折り曲げの立ち上がり部を互いに面接触させると共に、その先端縁をチューブ内面に接触させたものである。
【００１０】
次に、ヘッダ３は、筒状に形成され、その上下両端が端蓋９で閉塞されると共に、その一側面に偏平チューブ４の外周に整合するチューブ挿通孔が前述の如く多数穿設されている。ヘッダ３の外面には予めろう材が被覆され或いは配置され、さらには粉末状のろう材をバインダを介して塗布する等の手段により、それが被覆されてている。
ヘッダ３の外面には、チューブ挿通孔側に多数の微細溝６がヘッダ３の幅方向に離間して且つ、その微細溝６がヘッダ３の長手方向に平行に夫々配置されている。その微細溝６は、チューブ挿通孔１の端縁まで達する。
【００１１】
しかしながら、チューブ挿通孔１の幅方向の中央位置には微細溝６が存在しないようにする。その中央位置には、偏平チューブ４の継目５が形成されるからである。これは、継目５の位置と微細溝６の位置とが近接すると、微細溝６によって導かれたろう材が継目５に吸い寄せられることになり、それ以外の部分のろう材を減少させて、ろう付け不良部分を起こすおそれがあるからである。
従って、微細溝６は偏平チューブ４の継目５位置から充分離れた位置のみに多数存在する。
【００１２】
なお、チューブ挿通孔１はこの例では図４（Ａ）の如く、ピアス孔とする場合と、図５（Ａ）の如く孔縁部を内面側に突出し加工させたバーリング孔とする場合と、図６（Ａ）のようにピアス絞りとする場合とがあり、何れの場合にも本発明は適用される。
また、微細溝６は毛管現象により周囲のろう材をここに導くものであり、その幅は０．３ｍｍ以内とすることが好ましい。さらに微細溝６の深さは、被覆されるクラッド層の厚み以内であることが望ましい。
【００１３】
なお、微細溝６をＶ字状に形成した場合、その開き角度は３０°〜９０°とすることが好ましい。また、断面Ｖ字状の代わりにＵ字状或いは円弧状とすることもできる。
そして図２の如く、ヘッダ３に夫々の偏平チューブ４の端部を挿通すると共に、各偏平チューブ４間にコルゲートフィン７を配置して全体を組立てる。それと共に、ヘッダ３のろう付け部にフラックスを付着させる。このときフラックスは、夫々の微細溝６により多く保持される。この例では、いわゆるノコロックろう付け（ノコロックは商品名）である。
【００１４】
そして不活性ガスの雰囲気の高温の炉内に、組み立てられた熱交換器が挿入され、各部品表面のろう材を溶融させる。ろう材が溶融しだすと、ヘッダ３の外表面では、毛管現象によってそれが微細溝６に集められ、その微細溝６に沿ってろう材が流動して、チューブ挿通孔１に導かれる。そして、そのろう材がチューブ挿通孔１の内周と偏平チューブ４の外周との間に保持される。次いで、熱交換器を冷却することにより、偏平チューブ４の外周とチューブ挿通孔１の内周との間を一体に且つ液密にろう付け固定する。それと同時に、偏平チューブ４の継目５自体および偏平チューブ４の外表面とコルゲートフィン７との接触部が一体にろう付け固定される。
【００１５】
なお、図４（Ｂ）はろう付け後の偏平チューブ４とコルゲートフィン７とのろう付け部およびヘッダ３と偏平チューブ４とのろう付け部を示す横断面略図である。
また、多数の微細溝６間のピッチはチューブ挿通孔１から離れた位置のろう材を充分に微細溝６を介してチューブ挿通孔１に導けるピッチとすることが好ましい。 一例として、微細溝６のピッチは０．３ｍｍ〜２ｍｍ程度にすることが好ましい。
この微細溝６はヘッダを押出成形体とし、その成形時に同時に形成することが好ましい。また、ヘッダプレートとヘッダ本体でヘッダを構成する場合には、ヘッダプレート成形時にプレス加工等により微細溝６を成形することができる。或いは、その前に予め切削等により微細溝６を形成することも可能である。
【００１６】
次に、図７は本発明のさらに他の実施の形態であり、この例が図１のそれと異なる点は、偏平チューブ４の中央の継目５がその厚み方向に両側に形成されていることである。
この偏平チューブ４も断面が略Ｂ状に形成されているが、その折り曲げ方法が図１のそれとは全く異なるものである。これは、外面にろう材がクラッドされた帯状のアルミニューム金属板の幅方向中央位置を、折り返し曲折して立ち上げると共に、幅方向両縁を内面側に重ね合わせように折り返し、その折り返し先端どうしを接触すると共に、それらを中心の立ち上げ部材先端に夫々を接触させたものである。
【００１７】
このようにしてなる偏平チューブ４は、前記同様にしてヘッダ３のチューブ挿通孔にその両端部が挿通された状態で、前記同様に高温の炉内で一体的ろう付け固定される。このとき、偏平チューブ４の継目どうしも同時にろう付けされる。
【００１８】
【発明の作用・効果】
本発明の熱交換器は、ヘッダ３のチューブ挿通孔１側の外面で、その幅方向に互いに離間して多数のろう材誘導用の微細溝６が夫々長手方向に平行に形成されると共に、その微細溝６がチューブ挿通孔１の縁に達するように且つ、微細溝６が偏平チューブ４の継目５の位置から外れた位置にのみ形成されたものである。従って、偏平チューブ４の継目５に集中的にろう材２を供給させることなく、チューブ挿通孔１の各部に均等に且つ充分にろう材を供給し、偏平チューブ４とヘッダ３とのろう付けを確実に行うことができる。
【図面の簡単な説明】
【図１】本発明の熱交換器の要部横断面図であって、図２のＩ−Ｉ矢視断面拡大略図。
【図２】本熱交換器の正面図。
【図３】図１の III− III矢視断面拡大略図。
【図４】図１のIV−IV矢視断面略図であって、そのろう付け前とろう付け後の状態を示す。
【図５】図４の他の例のろう付け前およびろう付け後の状態を示す略図。
【図６】同図４のさらに他の例のろう付け前およびろう付け後の状態を示す略図。
【図７】本発明のさらに他の実施の形態を示す要部断面図。
【図８】図７のVIII部拡大図。
【符号の説明】
１ チューブ挿通孔
２ ろう材
３ ヘッダ
４ 偏平チューブ
５ 継目
６ 微細溝
７ コルゲートフィン
９ 端蓋[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aluminum heat exchanger having a header and a large number of tubes, and more particularly to a brazing structure of a flat tube having a substantially B-shaped cross section and a tube insertion hole of a header through which the tube is inserted.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, aluminum heat exchangers used as automobile radiators and air conditioners have a pair of headers and a number of flat tubes and fins. A brazing sheet in which a brazing material is clad on the joint surface with the flat tube is used for the header in consideration of brazing. In recent years, a method is also used in which a header is used as a bear (no brazing sheet) and a brazing material is disposed only at a joint portion with a tube.
[0003]
Furthermore, in order to improve the brazing between the flat tube and the header, a plurality of small grooves were formed on the surface of the header clad with the brazing material or the surface of the header on which the brazing material is disposed, and melted through the small grooves. Proposals have been made to guide the brazing material to the tube insertion hole (for example, Patent Document 1).
This small groove guides brazing at a position relatively far from the tube hole to the tube insertion hole, and is intended to ensure good brazing performance even with a small amount of brazing material clad.
[0004]
[Patent Document 1]
JP-A-2002-277187 (Claims and FIG. 3)
[0005]
[Problems to be solved by the invention]
The reason why the plurality of small grooves are arranged in the header in parallel with the longitudinal direction of the header is to guide the molten brazing material from the small groove to the tube insertion hole using capillary action during brazing.
However, according to the inventor's experiment, when a tube having a substantially B-shaped cross section as shown in FIG. 1 is inserted as a flat tube into the tube insertion hole of the header, even if a large number of small grooves are provided, the brazing material is connected to the joint. It has been found that the brazing material does not rotate sufficiently to other parts by that amount, resulting in poor brazing.
[0006]
Accordingly, the present invention provides a flat tube having a substantially B-shaped cross section, in which the brazing material rotates around the seam without concentrating the brazing material at the time of brazing, and the end portion of the flat tube and the tube insertion hole of the header tube It is an object to ensure uniform brazing between the two.
[0007]
[Means for Solving the Problems]
The present invention is a pair of elongated headers (a plurality of flat tube insertion holes (1) are arranged in parallel with each other in the longitudinal direction, and brazing material (2) is clad on the outer surface side or brazing material is attached ( 3) and
Each of the tube insertion holes (1) comprises a number of flat tubes (4) inserted at both ends,
The flat tube (4) comprises a seam (5) formed by bending a band-shaped metal plate in the width direction and superimposing both edges thereof in parallel to the center line,
In the header (3), on the outer surface on the tube insertion hole (1) side, a large number of fine grooves (6) for guiding the brazing filler metal are formed in parallel with each other in the longitudinal direction and spaced apart from each other in the width direction. The fine groove (6) is formed only at a position deviated from the position of the seam (5) of the flat tube (4) so that they reach the edge of the tube insertion hole (1), and the header ( 3) By melting the brazing material (2) on the outer surface and guiding it to the tube insertion hole (1) through the fine groove (6), the tube insertion hole (1) and the flat tube (4) outer surface It is a heat exchanger characterized by being liquid-tightly brazed between the two.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional enlarged view of a main part of a heat exchanger according to the present invention, and is a cross-sectional enlarged view taken along the line II in FIG. 2 is a front view of the heat exchanger, FIG. 3 is a further enlarged view taken along the line III-III in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.
As shown in FIG. 1, this heat exchanger has a pair of headers 3 arranged on the left and right (in some cases, up and down), and a number of flat tube insertion holes are spaced apart in the longitudinal direction of each header 3. Are arranged in parallel. Then, both ends of the flat tube 4 are inserted into the respective tube insertion holes, and corrugated fins 7 are arranged between the adjacent flat tubes 4.
[0009]
As shown in FIG. 1, the flat tube 4 has a substantially B-shaped cross section. Such a flat tube 4 is formed by bending a band-shaped metal plate clad with a brazing material on its outer surface side in the width direction and forming both end edges in an L shape, and the rising portions of the bends are in surface contact with each other. In addition, the tip edge is brought into contact with the inner surface of the tube.
[0010]
Next, the header 3 is formed in a cylindrical shape, and both upper and lower ends thereof are closed by end lids 9 and a plurality of tube insertion holes that are aligned with the outer periphery of the flat tube 4 are formed on one side thereof as described above. Yes. The outer surface of the header 3 is preliminarily coated or disposed with a brazing material, and further coated with a means such as applying a powdery brazing material via a binder.
On the outer surface of the header 3, a large number of fine grooves 6 are spaced apart in the width direction of the header 3 on the tube insertion hole side, and the fine grooves 6 are arranged in parallel to the longitudinal direction of the header 3. The fine groove 6 reaches the edge of the tube insertion hole 1.
[0011]
However, the fine groove 6 is not present at the center position in the width direction of the tube insertion hole 1. This is because the seam 5 of the flat tube 4 is formed at the center position. This is because when the position of the seam 5 and the position of the fine groove 6 are close to each other, the brazing material guided by the fine groove 6 is sucked to the seam 5, and the brazing material in other portions is reduced and brazed. This is because a defective part may be caused.
Accordingly, a large number of fine grooves 6 exist only at positions sufficiently separated from the position of the seam 5 of the flat tube 4.
[0012]
In this example, the tube insertion hole 1 is a piercing hole as shown in FIG. 4A, and a burring hole in which the edge of the hole protrudes toward the inner surface as shown in FIG. 5A. As shown in FIG. 6A, there are cases where a piercing aperture is used, and in any case, the present invention is applied.
The fine groove 6 leads the surrounding brazing material here by capillary action, and its width is preferably within 0.3 mm. Further, the depth of the fine groove 6 is preferably within the thickness of the clad layer to be coated.
[0013]
In addition, when the fine groove | channel 6 is formed in V shape, it is preferable that the opening angle shall be 30 degrees-90 degrees. Moreover, it can also be made into U shape or circular arc shape instead of V-shaped cross section.
Then, as shown in FIG. 2, the end portions of the respective flat tubes 4 are inserted into the header 3, and the corrugated fins 7 are arranged between the flat tubes 4 to assemble the whole. At the same time, flux is adhered to the brazed portion of the header 3. At this time, a large amount of flux is held in each fine groove 6. In this example, it is so-called noco-lock brazing (noco-lock is a trade name).
[0014]
Then, the assembled heat exchanger is inserted into a high-temperature furnace in an inert gas atmosphere to melt the brazing material on the surface of each component. When the brazing material starts to melt, on the outer surface of the header 3, it is collected in the fine groove 6 by capillary action, and the brazing material flows along the fine groove 6 and is guided to the tube insertion hole 1. Then, the brazing material is held between the inner periphery of the tube insertion hole 1 and the outer periphery of the flat tube 4. Next, by cooling the heat exchanger, the outer periphery of the flat tube 4 and the inner periphery of the tube insertion hole 1 are brazed and fixed integrally and liquid-tight. At the same time, the joint 5 itself of the flat tube 4 and the contact portion between the outer surface of the flat tube 4 and the corrugated fin 7 are brazed and fixed integrally.
[0015]
FIG. 4B is a schematic cross-sectional view showing the brazed portion between the flat tube 4 and the corrugated fin 7 and the brazed portion between the header 3 and the flat tube 4 after brazing.
Moreover, it is preferable that the pitch between the plurality of fine grooves 6 is a pitch that can sufficiently guide the brazing material at a position away from the tube insertion hole 1 to the tube insertion hole 1 through the fine groove 6. As an example, the pitch of the fine grooves 6 is preferably about 0.3 mm to 2 mm.
These fine grooves 6 are preferably formed at the same time as forming the header with an extruded body. Moreover, when a header is comprised with a header plate and a header main body, the fine groove | channel 6 can be shape | molded by press work etc. at the time of header plate shaping | molding. Alternatively, it is possible to form the fine groove 6 in advance by cutting or the like before that.
[0016]
Next, FIG. 7 shows still another embodiment of the present invention. This example is different from that of FIG. 1 in that the central seam 5 of the flat tube 4 is formed on both sides in the thickness direction. is there.
This flat tube 4 also has a substantially B-shaped cross section, but the bending method is completely different from that of FIG. This means that the center position in the width direction of the strip-shaped aluminum metal plate clad with the brazing material on the outer surface is folded and raised, folded back so that both edges in the width direction overlap the inner surface side, and the folded tips In contact with each other, and each of them is brought into contact with the tip of the rising member at the center.
[0017]
The flat tube 4 formed in this manner is integrally brazed and fixed in a high-temperature furnace in the same manner as described above, with both ends thereof being inserted into the tube insertion holes of the header 3 in the same manner as described above. At this time, the joints of the flat tubes 4 are also brazed together.
[0018]
[Operation and effect of the invention]
In the heat exchanger of the present invention, on the outer surface of the header 3 on the tube insertion hole 1 side, a large number of fine grooves 6 for guiding the brazing filler metal are formed in parallel with each other in the longitudinal direction and spaced apart from each other in the width direction. The fine groove 6 is formed only at a position where the fine groove 6 reaches the edge of the tube insertion hole 1 and deviates from the position of the joint 5 of the flat tube 4. Accordingly, the brazing material 2 is supplied evenly and sufficiently to each portion of the tube insertion hole 1 without causing the brazing material 2 to be intensively supplied to the joint 5 of the flat tube 4, and the flat tube 4 and the header 3 are brazed. It can be done reliably.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a heat exchanger according to the present invention, and is a schematic enlarged cross-sectional view taken along the line II in FIG.
FIG. 2 is a front view of the heat exchanger.
3 is an enlarged schematic cross-sectional view taken along the line III-III in FIG.
4 is a schematic cross-sectional view taken along the line IV-IV in FIG. 1, showing a state before brazing and after brazing.
5 is a schematic diagram showing the state of the other example of FIG. 4 before and after brazing.
6 is a schematic diagram showing a state before and after brazing of still another example of FIG. 4; FIG.
FIG. 7 is a cross-sectional view of a main part showing still another embodiment of the present invention.
8 is an enlarged view of a portion VIII in FIG.
[Explanation of symbols]
1 Tube insertion hole 2 Brazing material 3 Header 4 Flat tube 5 Seam 6 Fine groove 7 Corrugated fin 9 End lid

Claims (1)

長手方向に互いに離間して、多数の偏平なチューブ挿通孔(1) が並列され、外面側にろう材(2) がクラッドされまたは、ろう材が付着される一対の細長いヘッダ(3) と、
夫々の前記チューブ挿通孔(1) に、両端部が挿通された多数の偏平チューブ(4) と、を具備し、
前記偏平チューブ(4) は、帯状金属板を幅方向に曲折して、その両縁部を重ね合わせた継目(5) が、その中心線に平行に形成されたものからなり、
前記ヘッダ(3) には、チューブ挿通孔(1) 側の外面で、その幅方向に互いに離間して多数のろう材誘導用の微細溝(6) が夫々長手方向に平行に形成されると共に、それらが前記チューブ挿通孔(1) の縁に達するように且つ、その微細溝(6) は前記偏平チューブ(4) の前記継目(5) の位置から外れた位置にのみ形成され、ヘッダ(3) 外面の前記ろう材(2) を溶融して、前記微細溝(6) を介して前記チューブ挿通孔(1) に導くことにより、そのチューブ挿通孔(1) と偏平チューブ(4) 外面との間を液密にろう付けしたことを特徴とする熱交換器。A pair of elongated headers (3) spaced apart from each other in the longitudinal direction, in which a number of flat tube insertion holes (1) are juxtaposed, and brazing material (2) is clad or attached to the outer surface side;
Each of the tube insertion holes (1) includes a number of flat tubes (4) inserted at both ends,
The flat tube (4) comprises a seam (5) formed by bending a band-shaped metal plate in the width direction and superimposing both edges thereof in parallel to the center line,
In the header (3), on the outer surface on the tube insertion hole (1) side, a large number of fine grooves (6) for guiding the brazing filler metal are formed in parallel with each other in the longitudinal direction and spaced apart from each other in the width direction. The fine groove (6) is formed only at a position deviated from the position of the seam (5) of the flat tube (4) so that they reach the edge of the tube insertion hole (1), and the header ( 3) By melting the brazing material (2) on the outer surface and guiding it to the tube insertion hole (1) through the fine groove (6), the tube insertion hole (1) and the flat tube (4) outer surface A heat exchanger characterized by being brazed in a liquid-tight manner.
JP2003054603A 2003-02-28 2003-02-28 Heat exchanger Expired - Fee Related JP4207192B2 (en)

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