JPH0970658A - Manufacture of aluminum-made heat exchanger - Google Patents
Manufacture of aluminum-made heat exchangerInfo
- Publication number
- JPH0970658A JPH0970658A JP7251994A JP25199495A JPH0970658A JP H0970658 A JPH0970658 A JP H0970658A JP 7251994 A JP7251994 A JP 7251994A JP 25199495 A JP25199495 A JP 25199495A JP H0970658 A JPH0970658 A JP H0970658A
- Authority
- JP
- Japan
- Prior art keywords
- aluminum
- flat tube
- extruded flat
- brazing
- heat exchanger
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Landscapes
- Details Of Heat-Exchange And Heat-Transfer (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、アルミニウム及
びその合金製（以下にアルミニウム製という）熱交換器
の製造方法に関するもので、更に詳細には、例えばアル
ミニウム製熱交換器を構成する押出偏平管とフィンのろ
う付方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a heat exchanger made of aluminum and its alloy (hereinafter referred to as "aluminum"), and more specifically, for example, an extruded flat tube forming an aluminum heat exchanger. And the fin brazing method.
【０００２】[0002]
【従来の技術】一般に、アルミニウム製フィンとアルミ
ニウム製熱交換管とをろう付したアルミニウム製熱交換
器が広く使用されており、また、熱交換効率の向上を図
るために、熱交換管の形状は偏平管である。2. Description of the Related Art Generally, an aluminum heat exchanger in which an aluminum fin and an aluminum heat exchange tube are brazed is widely used, and in order to improve heat exchange efficiency, the shape of the heat exchange tube is changed. Is a flat tube.
【０００３】このように構成される熱交換器を作製する
ために、従来ではフィンと押出偏平管とをろう付する方
法として、 Ａｌ−Ｓｉ系のろう材がクラッドされたブレージング
シートを偏平電縫管にして、生地材からなるフィンとろ
う付する方法、 フィン材に亜鉛を含有させて電位を押出偏平管より卑
すなわち低電位にすることによりフィン材を犠牲陽極に
して防食を図れるようにするろう付方法、 押出偏平管表面に化学的に、あるいは溶射等の手段を
用いて亜鉛等の電位が低い金属を付着させ、ろう付時の
拡散で表面に電位が卑すなわち低電位の層（拡散層）を
生成させて、表面を犠牲陽極にして防食を図れるように
したろう付方法（特開昭６０−１８２９４号公報参照）
が知られている。A conventional brazing method for fins and extruded flat tubes in order to produce a heat exchanger having such a structure is to flat-sewing a brazing sheet clad with an Al--Si brazing material. A method of brazing with a fin made of a cloth material into a tube, and making the fin material sacrificial anode to prevent corrosion by adding zinc to the fin material so that the electric potential is lower than the extruded flat tube Brazing method, extruded flat tube surface chemically or by using a method such as thermal spraying to attach a low potential metal such as zinc, and the diffusion during brazing causes the surface to have a base or low potential layer (diffusion). Layer) to form a sacrificial anode on the surface to prevent corrosion (see JP-A-60-18294).
It has been known.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記
のろう付方法においては、Ａｌ−Ｓｉ系ろう材を用いる
ことによって、押出偏平管表面に母材より高電位な層を
設けることはできるが、偏平電縫管のままでは耐圧強度
を確保できないという問題があった。耐圧強度を上げる
ためには、偏平電縫管内に隔壁を形成するインサートフ
ィンを挿入して電縫管内面と接合して耐圧強度を増加さ
せるなどの手段が必要であり、製造工程が煩雑になると
いう問題があった。However, in the above brazing method, it is possible to form a layer having a higher potential than that of the base material on the surface of the extruded flat tube by using the Al-Si type brazing material, but it is possible to form the flat surface. There was a problem that pressure resistance could not be secured with the electric resistance welded pipe. In order to increase the pressure resistance, it is necessary to insert a fin that forms a partition into the flat electric resistance welded pipe and join it with the inner surface of the electric resistance welded pipe to increase the pressure resistance, which complicates the manufacturing process. There was a problem.
【０００５】また、上記のろう付方法においては、フ
ィンピッチが粗い場合、又は押出偏平管にフィンの無い
部分がある熱交換器の構造においては、部分的に著しく
耐食性の劣る状態となるという問題があった。In the above brazing method, when the fin pitch is rough, or in the structure of the heat exchanger in which the extruded flat tubes have no fins, the corrosion resistance is partially inferior. was there.
【０００６】一方、上記のろう付方法においては、押
出偏平管表面が犠牲防食の場合、腐食が進行すると押出
偏平管とフィンとの剥離が生じて、熱交換器としての性
能が維持できなくなるという問題があった。On the other hand, in the above brazing method, when the surface of the extruded flat tube is sacrificial anticorrosion, if the corrosion progresses, the extruded flat tube and the fins are separated from each other, and the performance as a heat exchanger cannot be maintained. There was a problem.
【０００７】この発明は上記事情に鑑みなされたもの
で、耐食性及び耐圧強度に優れたアルミニウム製熱交換
器の製造方法を提供することを目的とするものである。The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for manufacturing an aluminum heat exchanger having excellent corrosion resistance and pressure resistance.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、請求項１記載の発明は、アルミニウム偏平管及びア
ルミニウムフィンから構成される熱交換器の製造方法に
おいて、アルミニウム製の押出偏平管の表面に、この押
出偏平管より高電位で、母材より融点の低いアルミニウ
ム合金層を生成させて、上記アルミニウムフィンとろう
付を行うことを特徴とする。In order to achieve the above object, the invention according to claim 1 is a method for manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins. An aluminum alloy layer having a higher potential than that of the extruded flat tube and having a lower melting point than that of the base material is formed on the surface, and brazing is performed with the aluminum fin.
【０００９】請求項２記載の発明は、アルミニウム偏平
管及びアルミニウムフィンから構成される熱交換器の製
造方法において、Ａｌ−Ｓｉ，Ａｌ−Ｃｕ又はＡｌ−Ｓ
ｉ−Ｃｕのろう材粉末と、フラックス粉末と、パインダ
ーとからなる混合物を、アルミニウム製の押出偏平管の
表面に塗布すると共に、ろう材溶融温度以上に加熱し
て、上記押出偏平管表面に、この押出偏平管より高電位
のろう材合金層を生成させて、上記アルミニウムフィン
とろう付を行うことを特徴とする。According to a second aspect of the present invention, in a method of manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, Al-Si, Al-Cu or Al-S is used.
A mixture of a brazing filler metal powder of i-Cu, a flux powder, and a ender was applied to the surface of an extruded flat tube made of aluminum and heated to a brazing material melting temperature or higher to the extruded flat tube surface. It is characterized in that a brazing material alloy layer having a high electric potential is generated from the extruded flat tube and brazing is performed with the aluminum fin.
【００１０】請求項３記載の発明は、アルミニウム偏平
管及びアルミニウムフィンから構成される熱交換器の製
造方法において、アルミニウムとの共晶点がアルミニウ
ム製の押出偏平管より低溶融点である銅又は珪素又はそ
の両方と、フラックス粉末と、バインターとを混合し
て、上記押出偏平管表面に塗布し、共晶点以上に加熱し
て、上記混合物と母材表面との合金化で上記押出偏平管
表面に母材より高電位のろう材合金層を生成させて、上
記アルミニウムフィンとろう付を行うことを特徴とす
る。According to a third aspect of the present invention, in a method of manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, the eutectic point with aluminum has a lower melting point than that of the aluminum extruded flat tube. Silicon or both, a flux powder, and a binder are mixed, coated on the surface of the extruded flat tube, heated to a temperature above the eutectic point, and alloyed with the mixture and the surface of the base material to form the extruded flat tube. It is characterized in that a brazing alloy layer having a higher electric potential than that of the base material is formed on the surface and brazing is performed with the aluminum fin.
【００１１】請求項４記載の発明は、アルミニウム偏平
管及びアルミニウムフィンから構成される熱交換器の製
造方法において、アルミニウムとの共晶点がアルミニウ
ム製の押出偏平管より低融点である銅又は珪素又はその
両方と、アルミニウム粉末と、フラックス粉末と、バイ
ンダーとを混合して、上記押出偏平管表面に塗布し、共
晶点以上に加熱して、上記混合物の合金化で上記押出偏
平管表面に母材より高電位のろう材合金層を生成させ
て、上記アルミニウムフィンとろう付を行うことを特徴
とする。According to a fourth aspect of the present invention, in a method for manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, copper or silicon whose eutectic point with aluminum has a melting point lower than that of the aluminum extruded flat tube. Or both, an aluminum powder, a flux powder, and a binder are mixed and applied to the surface of the extruded flat tube, heated to a temperature higher than the eutectic point, and alloyed of the mixture to the surface of the extruded flat tube. It is characterized in that a brazing alloy layer having a higher electric potential than that of the base metal is generated and brazing is performed with the aluminum fin.
【００１２】請求項５記載の発明は、アルミニウム偏平
管及びアルミニウムフィンから構成される熱交換器の製
造方法において、Ａｌ−Ｓｉ，Ａｌ−Ｃｕ又はＡｌ−Ｓ
ｉ−Ｃｕの合金をアルミニウム製の押出偏平管表面に溶
射すると共に、フラックスを塗布し、上記合金の溶融温
度以上に加熱して、上記押出偏平管表面に母材より高電
位のろう材合金層を生成させて、上記アルミニウムフィ
ンとろう付を行うことを特徴とする。According to a fifth aspect of the present invention, there is provided a method of manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, which is Al-Si, Al-Cu or Al-S.
An alloy of i-Cu is sprayed on the surface of an extruded flat tube made of aluminum, a flux is applied and heated to a melting temperature of the alloy or higher, and a brazing material alloy layer having a higher potential than the base metal is formed on the surface of the extruded flat tube. Is produced and brazing is performed with the aluminum fin.
【００１３】請求項６記載の発明は、アルミニウム偏平
管及びアルミニウムフィンから構成される熱交換器の製
造方法において、アルミニウムとの共晶点がアルミニウ
ム製の押出偏平管より低融点である銅又は珪素又はその
両方の粉末を、上記押出偏平管表面に溶射すると共に、
フラックスを塗布し、共晶点以上に加熱して、上記混合
物と母材との合金化で上記押出偏平管表面に母材より高
電位のろう材合金層を生成させて、上記アルミニウムフ
ィンとろう付を行うことを特徴とする。According to a sixth aspect of the present invention, in a method of manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, copper or silicon having a lower eutectic point with aluminum than the extruded flat tube made of aluminum. Or spraying both powders onto the surface of the extruded flat tube,
Flux is applied and heated to a temperature higher than the eutectic point to form a brazing filler metal alloy layer having a higher potential than the base metal on the surface of the extruded flat tube by alloying the mixture with the base metal, and the aluminum fin and braze It is characterized by performing attachment.
【００１４】請求項７記載の発明は、アルミニウム偏平
管及びアルミニウムフィンから構成される熱交換器の製
造方法において、アルミニウムとの共晶点がアルミニウ
ム製の押出偏平管より低融点である銅又は珪素又はその
両方の粉末と、アルミニウム粉末を、上記押出偏平管表
面に溶射し、フラックスを塗布し、共晶点以上に加熱し
て、上記混合物の合金化で上記押出偏平管表面に母材よ
り高電位のろう材合金層を生成させて、上記アルミニウ
ムフィンとろう付を行うことを特徴とする。According to a seventh aspect of the present invention, in a method of manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, copper or silicon whose eutectic point with aluminum has a melting point lower than that of the aluminum extruded flat tube. Or both powders and aluminum powder are sprayed on the surface of the extruded flat tube, coated with a flux, heated to a temperature above the eutectic point, and alloyed with the mixture to give a higher surface than the base metal on the extruded flat tube surface. It is characterized in that a brazing material alloy layer having a potential is generated and brazing is performed with the aluminum fin.
【００１５】この発明において、上記フラックスはフッ
化物系フラックス、塩化物系フラックス等いずれでもよ
いが、非腐食性のフッ化物系フラックスが好ましい。フ
ッ化物系フラックスとしては、フッ化アルミニウム、ア
ルカリ金属のフッ化物、アルカリ土類金属のフッ化物及
びこれらの複合物（例えば、ＫＡｌ4，Ｋ2ＡｌＦ5・Ｈ2
Ｏ，Ｋ3ＡｌＦ6，ＡｌＦ3，ＬｉＦ，ＣａＦ2，ＮａＦ，
Ｌｉ3ＡｌＦ6，ＲｂＦ，ＣｓＦ，ＢａＦ2，ＡｌＦ3Ｂａ
Ｆ2等）あるいはこれらを主成分としたものが考えられ
る。In the present invention, the above-mentioned flux may be either a fluoride-based flux or a chloride-based flux, but a non-corrosive fluoride-based flux is preferred. Examples of the fluoride-based flux include aluminum fluoride, alkali metal fluorides, alkaline earth metal fluorides, and their composites (for example, KAl 4 , K 2 AlF 5 · H 2).
O, K 3 AlF 6 , AlF 3 , LiF, CaF 2 , NaF,
Li 3 AlF 6 , RbF, CsF, BaF 2 , AlF 3 Ba
F 2 etc.) or those containing these as the main components are considered.
【００１６】[0016]
【発明の実施の形態】以下、この発明の実施の形態を添
付図面に基づいて詳述する。Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
【００１７】この発明により製造される熱交換器は、熱
媒体の流入口１又は流出口２を有する一対の対峙するヘ
ッダ管３と、互いに平行に配列されてヘッダ管３に連通
する熱交換管としての複数の押出偏平管４と、押出偏平
管４の間に配設されるフィン５とで構成されている。こ
のように構成される熱交換器において、ヘッダ管３と押
出偏平管４はアルミニウム合金製押出形材にて形成さ
れ、フィン５はアルミニウム合金製板材を蛇行状に屈曲
形成してなり、そして、これらヘッダ管３、押出偏平管
４及びフィン５を後述するろう付方法によって一体ろう
付して熱交換器が構成されている。The heat exchanger manufactured according to the present invention comprises a pair of facing header pipes 3 having an inlet 1 or an outlet 2 of a heat medium, and heat exchange pipes arranged in parallel with each other and communicating with the header pipe 3. And a plurality of extruded flat tubes 4 and fins 5 arranged between the extruded flat tubes 4. In the heat exchanger configured as described above, the header tube 3 and the extruded flat tube 4 are made of an aluminum alloy extruded shape member, and the fins 5 are formed by bending an aluminum alloy plate material in a meandering shape. The header tube 3, the extruded flat tube 4 and the fins 5 are integrally brazed by a brazing method described later to form a heat exchanger.
【００１８】例えば上記押出偏平管４とフィン５とをこ
の発明のろう付方法によってろう付するには、図２に示
すように、上記押出偏平管４の母材より高電位のＡｌ−
Ｓｉ，Ａｌ−Ｃｕ又はＡｌ−Ｃｕ−Ｓｉのろう材粉末
と、フラックス粉末と、バインダーとからなる混合物
を、押出偏平管４の表面に塗布すると共に、ろう材溶融
温度以上に加熱して、押出偏平管表面にろう材合金層６
を生成させて、押出偏平管４とフィン５とをろう付する
ことができる。For example, in order to braze the extruded flat tube 4 and the fins 5 by the brazing method of the present invention, as shown in FIG.
A mixture of a brazing filler metal powder of Si, Al-Cu or Al-Cu-Si, a flux powder, and a binder is applied to the surface of the extruded flat tube 4 and is heated to a temperature higher than the melting temperature of the brazing filler metal and extruded. Brazing alloy layer 6 on the surface of the flat tube
The extruded flat tubes 4 and the fins 5 can be brazed to each other.
【００１９】別のろう付方法としては、アルミニウムと
の共晶点がアルミニウム製の押出偏平管４の母材より低
溶融点である銅（Ｃｕ）又は珪素（Ｓｉ）とアルミニウ
ムとの粉末を、例えばＫＡｌＦ4とＫ3ＡｌＦ6を混合し
たフッ化物系フラックス粉末と混合して押出偏平管４の
表面に塗布し、共晶点以上に加熱して、上記混合粉末と
母材との合金化で押出偏平管４表面に母材より高電位の
ろう材合金層を生成させて、押出偏平管４とフィン５と
をろう付することができる。As another brazing method, powder of copper (Cu) or silicon (Si) and aluminum having a lower eutectic point with aluminum than the base material of the extruded flat tube 4 made of aluminum is used. For example, KAlF 4 and K 3 AlF 6 are mixed with a fluoride-based flux powder and applied on the surface of the extruded flat tube 4, and heated to a temperature higher than the eutectic point to alloy the mixed powder with the base material. The extruded flat tube 4 and the fins 5 can be brazed by forming a brazing alloy layer having a higher potential than the base metal on the surface of the extruded flat tube 4.
【００２０】また、別のろう付方法としては、例えば押
出偏平管４の母材より高電位のＡｌ−Ｓｉ，Ａｌ−Ｃｕ
又はＡｌ−Ｃｕ−Ｓｉの合金を、押出偏平管表面に溶射
する共に、フッ化物系フラックスを塗布し、上記合金の
溶融温度以上に加熱して、押出偏平管表面にろう材合金
層を生成させて、押出偏平管４とフィン５とをろう付す
ることができる。As another brazing method, for example, Al-Si, Al-Cu having a higher potential than the base material of the extruded flat tube 4 is used.
Alternatively, an Al-Cu-Si alloy is sprayed on the surface of the extruded flat tube, and a fluoride flux is applied and heated to a temperature above the melting temperature of the alloy to form a brazing material alloy layer on the surface of the extruded flat tube. Thus, the extruded flat tube 4 and the fins 5 can be brazed.
【００２１】更に別のろう付方法としては、アルミニウ
ムとの共晶点が例えば押出偏平管４の母材より低溶融点
で、Ｃｕ又はＳｉ又は両方の粉末を、押出偏平管表面に
溶射すると共に、フッ化物系フラックスを塗布し、上記
共晶点以上に加熱して、押出偏平管表面に母材より高電
位のろう材合金層を生成させて、押出偏平管４とフィン
５とをろう付することができる。As another brazing method, the eutectic point with aluminum is lower than the melting point of the base material of the extruded flat tube 4, for example, and Cu or Si or both powders are sprayed on the surface of the extruded flat tube. , Applying a fluoride-based flux and heating it to a temperature above the eutectic point to form a brazing alloy layer having a higher potential than the base metal on the surface of the extruded flat tube, and brazing the extruded flat tube 4 and the fins 5 together. can do.
【００２２】上記のようにして、押出偏平管４とフィン
５とをろう付あるいはヘッダ管３と押出偏平管４とをろ
う付することにより、従来のようにブレージングシート
を伝縫管にした伝導管と比較して、押出偏平管４を用い
ることにより、断面形状の設計が自由になる。したがっ
て、耐圧強度を加味した設計が可能となる。As described above, by brazing the extruded flat tube 4 and the fins 5 or brazing the header tube 3 and the extruded flat tube 4, the brazing sheet is used as a transfer tube as in the prior art. By using the extruded flat tube 4 as compared with the tube, the cross-sectional shape can be freely designed. Therefore, it is possible to design in consideration of pressure resistance.
【００２３】また、フィンを犠牲陽極とした従来の防食
設計では、フィンの無い部分の耐食性が不充分である
が、この発明によれば、押出偏平管４の表面全面にわた
って防食されるため、押出偏平管４にフィン５の無い部
分があるような熱交換器の設計可能である。Further, in the conventional anticorrosion design in which fins are used as sacrificial anodes, the corrosion resistance of the portion without fins is insufficient, but according to the present invention, the entire surface of the extruded flat tube 4 is corroded, and therefore the extruded flat tube 4 is extruded. It is possible to design the heat exchanger such that the flat tube 4 has a portion without the fins 5.
【００２４】更には、押出偏平管表面に犠牲陽極となる
層７を設けた熱交換器では、図３に示すように、腐食が
進行すると押出偏平管４からフィン５が剥離し、熱交換
器としての性能が著しく低下するが、この発明の方法に
おいては、防食では腐食が進んでもフィン５の剥離は生
じにくいため、熱交換器性能の低下の虞れはない。Further, in the heat exchanger in which the layer 7 serving as a sacrificial anode is provided on the surface of the extruded flat tube, as shown in FIG. 3, when the corrosion progresses, the fins 5 are separated from the extruded flat tube 4 and the heat exchanger is removed. However, in the method of the present invention, since the fins 5 are less likely to be peeled off even if corrosion progresses in corrosion prevention, there is no fear of deterioration of the heat exchanger performance.
【００２５】なお、上記実施形態では、一対のヘッダ管
３の間に複数の押出偏平管４を平行に配列し、押出偏平
管４の間にフィン５を介在したパラレルフロー型熱交換
器について説明したが、熱交換管としての押出偏平管を
蛇行状に屈曲させてヘッダ管に連通し、隣接する押出偏
平管の間にフィンを同様に介在させるようにしたサーペ
インタイン型熱交換器としてもよい。In the above embodiment, a parallel flow type heat exchanger in which a plurality of extruded flat tubes 4 are arranged in parallel between a pair of header tubes 3 and fins 5 are interposed between the extruded flat tubes 4 will be described. However, the extruded flat tube as a heat exchange tube is bent in a meandering manner and communicates with the header tube, and fins are similarly interposed between adjacent extruded flat tubes as a surface painter type heat exchanger. Good.
【００２６】[0026]
【実施例】次に、この発明のろう付方法の実施例と比較
例との孔食深さについての比較実験について説明する。 供試材 押出偏平管：ＪＩＳ Ａ１０５０材 １８．８ｍｍ幅×１．９ｍｍ厚（肉厚０．４ｍｍ） フィン材：ＪＩＳ Ａ３００３＋１．５％Ｚｎ材 ２１．１ｍｍ幅×０．１ｍｍ厚 ★実施例１ ・Ａｌ−７．５％Ｓｉ−０．５％Ｃｕ粉末 ・フッ化物系フラックス ・バインダー（熱可塑型アクリル・コポリマー） の混合物を押出偏平管４表面上に塗布 ろう材溶融温度（例えば６００〜６１５℃）以上に加熱
して、押出偏平管４表面にろう材合金層６を生成させ、
フィン５とろう付した。EXAMPLE Next, a comparative experiment on the pitting depth between the example of the brazing method of the present invention and the comparative example will be described. Sample material Extruded flat tube: JIS A1050 material 18.8 mm width x 1.9 mm thickness (wall thickness 0.4 mm) Fin material: JIS A3003 + 1.5% Zn material 21.1 mm width x 0.1 mm thickness * Example 1 A mixture of Al-7.5% Si-0.5% Cu powder-fluoride-based flux-binder (thermoplastic acrylic copolymer) is applied on the surface of the extruded flat tube 4 Brazing material melting temperature (for example, 600 to 615 ° C) ) By heating above, a brazing alloy layer 6 is formed on the surface of the extruded flat tube 4,
It was brazed with fin 5.
【００２７】★実施例２ ・Ｓｉ粉末 ・フッ化物系フラックス ・バインダー（熱可塑型アクリル・コポリマー） の混合物を押出偏平管４表面上に塗布 共晶温度５７７℃以上５９５℃に加熱して上記粉末と押
出偏平管４の母材とで押出偏平管４表面に溶けた金属を
生成させ、ろう材として寄与させることによりフィン５
とろう付した。Example 2 A mixture of Si powder, fluoride flux, and binder (thermoplastic acrylic copolymer) was applied on the surface of the extruded flat tube 4. The powder was heated to a eutectic temperature of 577 ° C or higher and 595 ° C. And the base material of the extruded flat tube 4 generate the molten metal on the surface of the extruded flat tube 4 and contribute as a brazing material to the fin 5
Brazed.
【００２８】★実施例３ ・Ａｌ−１２％Ｓｉ を押出偏平管４表面上にアーク溶射 押出偏平管４表面にフッ化物系フラックスを塗布し、ろ
う材溶融温度（例えば５９０〜５９５℃）以上に加熱し
て、フィン５とろう付した。[Example 3] Al-12% Si is arc sprayed on the surface of the extruded flat tube 4 A fluoride flux is applied to the surface of the extruded flat tube 4, and the brazing material melting temperature (for example, 590 to 595 ° C) or higher is applied. It was heated and brazed with fins 5.
【００２９】★実施例４ ・Ｓｉ粉末 ・Ｃｕ粉末 上記粉末混合物を押出偏平管４表面上にプラズマ溶射 押出偏平管４表面にフッ化物系フラックスを塗布し、共
晶温度（例えば５６０〜５７０℃）以上に加熱して、上
記粉末と押出偏平管４の母材とで押出偏平管４表面に溶
けた金属を生成させ、ろう材として寄与させることによ
りフィンとろう付した。Example 4 Si powder Cu powder Plasma spraying the above powder mixture onto the surface of the extruded flat tube 4 Fluoride flux was applied to the surface of the extruded flat tube 4 and the eutectic temperature (for example, 560 to 570 ° C.) By heating as described above, a metal melted on the surface of the extruded flat tube 4 was generated by the powder and the base material of the extruded flat tube 4, and contributed as a brazing material to be brazed to the fins.
【００３０】★比較例（従来例） ・押出偏平管 ＪＩＳ Ａ１０５０材＋亜鉛溶射 １８．８ｍｍ幅×１．９ｍｍ厚（肉厚０．４ｍｍ） ・フィン材 皮材：ＪＩＳ Ａ４３４３＋１．５％Ｚｎ 心材：ＪＩＳ Ａ４３４３＋１．５％ｎＺ ２１．１ｍｍ幅×０．１ｍｍ厚 上記実施例１〜４のものと比較例のものを腐食促進試験
したところ、表１に示すような結果が得られた。Comparative Example (Conventional Example) Extruded flat tube JIS A1050 material + zinc sprayed 18.8 mm width x 1.9 mm thickness (wall thickness 0.4 mm) Fin material Skin material: JIS A4343 + 1.5% Zn Core material: JIS A4343 + 1.5% nZ 21.1 mm width × 0.1 mm thickness When the corrosion acceleration tests of the above Examples 1 to 4 and Comparative Example were performed, the results shown in Table 1 were obtained.
【００３１】[0031]
【表１】 [Table 1]
【００３２】実験の結果、ＣＡＳＳ｛キャス試験（ＪＩ
Ｓ Ｈ８６８１）｝５００時間（ｈｒ）においては、実
施例１〜４のものは孔食深さが７５〜１１１μｍである
のに対し、比較例のものでは２４２μｍであり、１００
０ｈｒにおいては、実施例１〜４のものは孔食深さ１２
６〜１５３μｍであるのに対し、比較例のものにおいて
は貫通孔が生じた。また、１５００ｈｒにおいては、実
施例１〜４のものにおいては孔食深さ１７７〜２３３μ
ｍであった。また、ＳＳＴ｛塩水噴霧試験（ＪＩＳ Ｚ
２３７１）｝５０００ｈｒにおいては、実施例１〜４の
ものは孔食深さ１０８〜１３１μｍであるのに対し、比
較例のものは２２７μｍであることが判り、実施例１〜
４のものは比較例のものに比べて腐食の促進が少く、耐
食性及び耐圧強度に富むことが判った。As a result of the experiment, CASS {cass test (JI
S H8681)} at 500 hours (hr), the pitting depths of Examples 1 to 4 were 75 to 111 μm, whereas those of Comparative Example were 242 μm, and 100
At 0 hr, those of Examples 1 to 4 had a pitting depth of 12
6 to 153 μm, whereas in the comparative example, through holes were formed. Further, at 1500 hr, in the case of Examples 1 to 4, the pitting depth was 177 to 233 μ.
m. In addition, SST {salt spray test (JIS Z
2371)} at 5000 hr, the pitting depths of Examples 1 to 4 are 108 to 131 μm, whereas the pitting depth of Comparative Example is 227 μm.
It was found that those of No. 4 had less corrosion promotion than those of Comparative Examples, and were excellent in corrosion resistance and pressure resistance.
【００３３】[0033]
【発明の効果】以上に説明したように、この発明のアル
ミニウム製熱交換器の製造方法によれば、アルミニウム
及びその合金製の押出偏平管の表面に、この部材の母材
より高電位で、母材より融点の低いアルミニウム合金層
を生成させて、ろう付を行うことにより、アルミニウム
製熱交換器の耐食性及び耐圧強度性の向上を図ることが
でき、アルミニウム製熱交換器の寿命の増大を図ること
ができる。As described above, according to the method for manufacturing an aluminum heat exchanger of the present invention, on the surface of an extruded flat tube made of aluminum and its alloy, at a higher potential than the base material of this member, By forming an aluminum alloy layer having a lower melting point than the base metal and performing brazing, it is possible to improve the corrosion resistance and pressure resistance of the aluminum heat exchanger and increase the life of the aluminum heat exchanger. Can be planned.
【図１】この発明の製造方法によりろう付された熱交換
器の一例を示す概略斜視図である。FIG. 1 is a schematic perspective view showing an example of a heat exchanger brazed by a manufacturing method of the present invention.
【図２】この発明の製造方法によりろう付される押出偏
平管とフィンのろう付部の拡大断面図である。FIG. 2 is an enlarged cross-sectional view of a brazed portion of an extruded flat tube and fins brazed by the manufacturing method of the present invention.
【図３】従来のろう付方法によりろう付される押出偏平
管とフィンのろう付部の拡大断面図である。FIG. 3 is an enlarged cross-sectional view of a brazing portion of an extruded flat tube and fins brazed by a conventional brazing method.
４ アルミニウム製押出偏平管 ５ アルミニウムフィン ６ ろう材合金層（アルミニウム合金層） 4 Extruded flat tube made of aluminum 5 Aluminum fin 6 Brazing material alloy layer (aluminum alloy layer)
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２３Ｋ 35/28 ３１０ Ｂ２３Ｋ 35/28 ３１０Ａ Ｆ２８Ｆ 1/32 Ｆ２８Ｆ 1/32 Ｂ 9/18 9/18 21/02 21/02 // Ｂ２３Ｋ 101:14 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location B23K 35/28 310 B23K 35/28 310A F28F 1/32 F28F 1/32 B 9/18 9/18 21/02 21/02 // B23K 101: 14
Claims (7)
ィンから構成される熱交換器の製造方法において、 アルミニウム製の押出偏平管の表面に、この押出偏平管
より高電位で、母材より融点の低いアルミニウム合金層
を生成させて、上記アルミニウムフィンとろう付を行う
ことを特徴とするアルミニウム製熱交換器の製造方法。1. A method for manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, wherein an aluminum alloy having a higher electric potential than that of the extruded flat tube and a melting point lower than that of the base material is provided on the surface of the extruded flat tube made of aluminum. A method for manufacturing an aluminum heat exchanger, which comprises forming a layer and brazing the aluminum fin.
ィンから構成される熱交換器の製造方法において、 Ａｌ−Ｓｉ，Ａｌ−Ｃｕ又はＡｌ−Ｓｉ−Ｃｕのろう材
粉末と、フラックス粉末と、パインダーとからなる混合
物を、アルミニウム製の押出偏平管の表面に塗布すると
共に、ろう材溶融温度以上に加熱して、上記押出偏平管
表面に、この押出偏平管より高電位のろう材合金層を生
成させて、上記アルミニウムフィンとろう付を行うこと
を特徴とするアルミニウム製熱交換器の製造方法。2. A method for manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, which comprises a brazing filler metal powder of Al-Si, Al-Cu or Al-Si-Cu, a flux powder, and a pinder. The mixture is applied to the surface of an extruded flat tube made of aluminum, and heated to a brazing material melting temperature or higher to generate a brazing material alloy layer having a higher potential than this extruded flat tube on the extruded flat tube surface. A method for manufacturing an aluminum heat exchanger, which comprises brazing with the aluminum fin.
ィンから構成される熱交換器の製造方法において、 アルミニウムとの共晶点がアルミニウム製の押出偏平管
より低溶融点である銅又は珪素又はその両方と、フラッ
クス粉末と、バインターとを混合して、上記押出偏平管
表面に塗布し、共晶点以上に加熱して、上記混合物と母
材表面との合金化で上記押出偏平管表面に母材より高電
位のろう材合金層を生成させて、上記アルミニウムフィ
ンとろう付を行うことを特徴とするアルミニウム製熱交
換器の製造方法。3. A method for manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, wherein copper or silicon or both of which has a lower eutectic point with aluminum than the extruded flat tube made of aluminum, and A flux powder and a binder are mixed, applied to the surface of the extruded flat tube, heated to a temperature higher than the eutectic point, and the mixture and the surface of the base material are alloyed with each other so that the surface of the extruded flat tube is higher than the base material. A method for manufacturing an aluminum heat exchanger, characterized in that a brazing material alloy layer having an electric potential is generated and brazing is performed with the aluminum fin.
ィンから構成される熱交換器の製造方法において、 アルミニウムとの共晶点がアルミニウム製の押出偏平管
より低融点である銅又は珪素又はその両方と、アルミニ
ウム粉末と、フラックス粉末と、バインダーとを混合し
て、上記押出偏平管表面に塗布し、共晶点以上に加熱し
て、上記混合物の合金化で上記押出偏平管表面に母材よ
り高電位のろう材合金層を生成させて、上記アルミニウ
ムフィンとろう付を行うことを特徴とするアルミニウム
製熱交換器の製造方法。4. A method for manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, wherein copper or silicon or both of which have a lower eutectic point with aluminum than the extruded flat tube made of aluminum and aluminum. Powder, flux powder, and binder are mixed, applied to the surface of the extruded flat tube, heated to a temperature higher than the eutectic point, and the mixture is alloyed to have a higher potential than the base material on the surface of the extruded flat tube. A method for manufacturing an aluminum heat exchanger, characterized in that a brazing material alloy layer is formed and brazing is performed with the aluminum fin.
ィンから構成される熱交換器の製造方法において、 Ａｌ−Ｓｉ，Ａｌ−Ｃｕ又はＡｌ−Ｓｉ−Ｃｕの合金を
アルミニウム製の押出偏平管表面に溶射すると共に、フ
ラックスを塗布し、上記合金の溶融温度以上に加熱し
て、上記押出偏平管表面に母材より高電位のろう材合金
層を生成させて、上記アルミニウムフィンとろう付を行
うことを特徴とするアルミニウム製熱交換器の製造方
法。5. A method for manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, wherein an Al-Si, Al-Cu or Al-Si-Cu alloy is sprayed on the surface of an aluminum extruded flat tube. Characterized by applying a flux and heating it to a temperature above the melting temperature of the alloy to generate a brazing alloy layer having a higher potential than the base metal on the surface of the extruded flat tube, and brazing with the aluminum fin. Method for manufacturing aluminum heat exchanger.
ィンから構成される熱交換器の製造方法において、 アルミニウムとの共晶点がアルミニウム製の押出偏平管
より低融点である銅又は珪素又はその両方の粉末を、上
記押出偏平管表面に溶射すると共に、フラックスを塗布
し、共晶点以上に加熱して、上記混合物と母材との合金
化で上記押出偏平管表面に母材より高電位のろう材合金
層を生成させて、上記アルミニウムフィンとろう付を行
うことを特徴とするアルミニウム製熱交換器の製造方
法。6. A method for manufacturing a heat exchanger comprising an aluminum flat tube and aluminum fins, wherein powder of copper or silicon or both of which has a lower eutectic point with aluminum than the extruded flat tube made of aluminum is used. While spraying on the surface of the extruded flat tube, applying a flux, heating it to a temperature higher than the eutectic point, and alloying the mixture with the base material to form a brazing alloy having a higher potential than the base material on the surface of the extruded flat tube. A method for manufacturing an aluminum heat exchanger, which comprises forming a layer and brazing the aluminum fin.
ィンから構成される熱交換器の製造方法において、 アルミニウムとの共晶点がアルミニウム製の押出偏平管
より低融点である銅又は珪素又はその両方の粉末と、ア
ルミニウム粉末を、上記押出偏平管表面に溶射し、フラ
ックスを塗布し、共晶点以上に加熱して、上記混合物の
合金化で上記押出偏平管表面に母材より高電位のろう材
合金層を生成させて、上記アルミニウムフィンとろう付
を行うことを特徴とするアルミニウム製熱交換器の製造
方法。7. A method of manufacturing a heat exchanger composed of an aluminum flat tube and aluminum fins, wherein powder of copper or silicon or both of which has a lower eutectic point with aluminum than the extruded flat tube made of aluminum, and , An aluminum powder is sprayed on the surface of the extruded flat tube, a flux is applied, and the mixture is heated to a temperature higher than the eutectic point, and by alloying the mixture, a brazing filler metal alloy layer having a higher potential than the base metal on the surface of the extruded flat tube. Is produced and brazing is performed with the aluminum fins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25199495A JP3627876B2 (en) | 1995-09-05 | 1995-09-05 | Method for manufacturing aluminum heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25199495A JP3627876B2 (en) | 1995-09-05 | 1995-09-05 | Method for manufacturing aluminum heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0970658A true JPH0970658A (en) | 1997-03-18 |
| JP3627876B2 JP3627876B2 (en) | 2005-03-09 |
Family
ID=17231073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25199495A Expired - Lifetime JP3627876B2 (en) | 1995-09-05 | 1995-09-05 | Method for manufacturing aluminum heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3627876B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100422059B1 (en) * | 2001-06-29 | 2004-03-12 | 위니아만도 주식회사 | Header pipe cladding method of heat exchanger |
| KR20040051033A (en) * | 2002-12-11 | 2004-06-18 | 엘지전자 주식회사 | Apparatus for preventing corrosion of condenser in air conditioner |
| KR100587156B1 (en) * | 2004-10-20 | 2006-06-08 | 모딘코리아 유한회사 | Manufacturing process of tube for heat exchanger and Heat exchanger using the same |
| JPWO2021186491A1 (en) * | 2020-03-16 | 2021-09-23 |
-
1995
- 1995-09-05 JP JP25199495A patent/JP3627876B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100422059B1 (en) * | 2001-06-29 | 2004-03-12 | 위니아만도 주식회사 | Header pipe cladding method of heat exchanger |
| KR20040051033A (en) * | 2002-12-11 | 2004-06-18 | 엘지전자 주식회사 | Apparatus for preventing corrosion of condenser in air conditioner |
| KR100587156B1 (en) * | 2004-10-20 | 2006-06-08 | 모딘코리아 유한회사 | Manufacturing process of tube for heat exchanger and Heat exchanger using the same |
| JPWO2021186491A1 (en) * | 2020-03-16 | 2021-09-23 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3627876B2 (en) | 2005-03-09 |
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