JP2766532B2 - Manufacturing method of aluminum double-pipe heat exchanger - Google Patents
Manufacturing method of aluminum double-pipe heat exchangerInfo
- Publication number
- JP2766532B2 JP2766532B2 JP1308560A JP30856089A JP2766532B2 JP 2766532 B2 JP2766532 B2 JP 2766532B2 JP 1308560 A JP1308560 A JP 1308560A JP 30856089 A JP30856089 A JP 30856089A JP 2766532 B2 JP2766532 B2 JP 2766532B2
- Authority
- JP
- Japan
- Prior art keywords
- brazing
- pipe
- aluminum
- tube
- 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.)
- Expired - Lifetime
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明は自動車用の水冷オイルクーラー等に用いら
れるアルミニウム製の二重管式熱交換器の製造方法に関
する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an aluminum double-pipe heat exchanger used for a water-cooled oil cooler for an automobile or the like.
なおこの明細書において、アルミニウムの語はその合
金を含む意味で用いる。In this specification, the term aluminum is used to include its alloy.
従来の技術 アルミニウム製の二重管式熱交換器は、一般に、同軸
配置されたアルミニウムからなる内管と外管との間に熱
交換媒体流通空間が形成されるとともに、該空間に伝熱
効率向上用のアルミニウム製インナーフィンが内外両管
に接合した態様で装填された構成を有している。従っ
て、かかる二重管式熱交換器の効率向上のためには、イ
ンナーフィンと内外両管との十分な接合が不可欠であ
る。このため、本出願人は内外管またはインナーフィン
の少なくとも一方にアルミニウムブレージングシートを
用い、内外管とインナーフィンをろう付接合する方法を
提案したが（特願平11−131845号）、さらに十分なろう
付を保証すべく、ろう付に先立って内管を長さ方向に亘
って拡管し、内外管とインナーフィンとを密着させる工
程を行っている。2. Description of the Related Art Aluminum double-pipe heat exchangers generally have a heat exchange medium flow space formed between an inner pipe and an outer pipe made of coaxially arranged aluminum, and improve heat transfer efficiency in the space. Aluminum fins are mounted in such a manner as to be joined to the inner and outer tubes. Therefore, in order to improve the efficiency of such a double-pipe heat exchanger, it is essential that the inner fin and the inner and outer pipes are sufficiently joined. For this reason, the present applicant has proposed a method of brazing and joining the inner and outer tubes and the inner fins using an aluminum brazing sheet for at least one of the inner and outer tubes or the inner fins (Japanese Patent Application No. 11-131845). Prior to brazing, a step of expanding the inner pipe in the longitudinal direction and bringing the inner and outer pipes into close contact with the inner fins is performed to assure brazing.
発明が解決しようとする課題 ところで、内管はその構成部材としてアルミニウムシ
ートの筒状成形体の両側縁衝き合わせ部を電縫溶接した
電縫管を用いることができるが、外管はサイズが大きい
ため衝き合わせ部の電縫溶接が困難である。このため、
外管としてその衝き合わせ部を分離状態のままにした筒
状成形体を用いていたが、次のような欠点があった。Problems to be Solved by the Invention By the way, the inner pipe may be an ERW pipe in which the both edges of the cylindrically formed aluminum sheet are welded by ERW, but the outer pipe is large in size. Therefore, it is difficult to perform the electric resistance welding at the abutting portion. For this reason,
As the outer tube, a cylindrical molded body whose abutting portion is kept separated is used, but has the following disadvantages.
即ち、前述した内外管とインナーフィンとを密着させ
るための内管の拡管工程を実施した場合、外管の両側縁
衝き合わせ部が分離状態のままであると拡管により半径
方向の力を受け、該衝き合わせ部が拡開分離してしまう
ため、内外管とインナーフィンとの十分な密着性が得ら
れないという欠点があった。もっとも、これを防止する
ため、第15図に示すように割金型（100）に熱交換器組
立物（110）を嵌め込んで固定することにより外管（11
2）の両側縁衝き合わせ部（112a）を拡開不能にを拘束
し、この状態で拡管用マンドレル（120）を内管（111）
に挿入して拡開することが行われている。しかしこの場
合は、ろう付工程に移行する際、割金型から外したとき
に弾力による外管衝き合わせ部（112a）の拡管を禁じ得
ず、やはり内外管とインナーフィンとの密着性が損われ
るという問題があった。このような状態でろう付を行っ
てもインナーフィンの接合率が90％程度して確保されな
いこととなり、ひいては十分な熱交換効率を得ることが
できなかった。That is, when the inner pipe expanding step for bringing the inner and outer pipes and the inner fins into close contact with each other is performed, the outer pipe receives a radial force due to the expanding when the abutting portions on both side edges of the outer pipe remain separated. Since the abutting portion expands and separates, there is a drawback that sufficient adhesion between the inner and outer tubes and the inner fin cannot be obtained. However, in order to prevent this, as shown in FIG. 15, the outer tube (11) is fitted by fixing the heat exchanger assembly (110) to the split mold (100).
2) The abutting portions (112a) of both side edges are restrained from being unspread, and in this state, the mandrel (120) for expanding the tube is connected to the inner tube (111).
It is performed to insert and expand. However, in this case, when moving to the brazing process, the expansion of the outer pipe abutting portion (112a) due to elasticity cannot be prohibited when the inner pipe is removed from the split mold, and the adhesion between the inner and outer pipes and the inner fins is also lost. There was a problem that was. Even when brazing is performed in such a state, the joining ratio of the inner fins is about 90% and cannot be ensured, so that sufficient heat exchange efficiency cannot be obtained.
この発明は、かかる技術的背景に鑑みてなされたもの
であって、内外管とインナーフィンとの十分な密着性を
確保した状態でろう付を行うことができ、ひいては優れ
た熱交換効率を有するアルミニウム製二重管式熱交換器
の製作提供を目的とする。The present invention has been made in view of such a technical background, and it is possible to perform brazing while ensuring sufficient adhesion between the inner and outer tubes and the inner fin, and thus has excellent heat exchange efficiency. The purpose is to manufacture and provide an aluminum double tube heat exchanger.
課題を解決するための手段 上記目的を達成するために、この発明は、アルミニウ
ム製の内管（１）と、アルミニウムシートをその両側縁
部が衝き合わせ状となるように筒状に成形した外管
（２）とを同軸に配置するとともに、内外両管の間の熱
交換媒体流通空間（３）にアルミニウム製のインナーフ
ィンを装填したのち、内管（１）を長さ方向に亘って拡
管し、次いでろう付により内外管（１）（２）とインナ
ーフィン（４）とを接合するアルミニウム製二重管式熱
交換器の製造方法であって、少なくとも前記拡管からろ
う付までの工程を、前記外管（２）にその衝き合わせ部
（24）の離間防止手段を設けた状態で行うことを特徴と
する。Means for Solving the Problems In order to achieve the above object, the present invention provides an inner tube (1) made of aluminum and an outer tube formed by shaping an aluminum sheet into a tubular shape so that both side edges thereof are in contact with each other. After the tube (2) is arranged coaxially, an inner fin made of aluminum is loaded in the heat exchange medium flowing space (3) between the inner and outer tubes, and then the inner tube (1) is expanded in the longitudinal direction. A method of manufacturing an aluminum double-tube heat exchanger in which the inner and outer tubes (1) and (2) and the inner fin (4) are joined by brazing, wherein at least the steps from the expansion to brazing are performed. The method is characterized in that the outer tube (2) is provided with a means for preventing separation of the butting portion (24).
作 用 内管（１）の拡管工程により内外管（１）（２）とイ
ンナーフィン（４）とは密着するが、離間防止手段によ
りこの密着状態がろう付工程の終了まで保持され、この
状態のままインナーフィン（４）と内外管（１）（２）
とがろう付される。その結果、外管（２）の衝き合わせ
部（24）の拡開に起因するインナーフィンと内外管との
接合不良が防止される。The inner and outer pipes (1) and (2) and the inner fin (4) are in close contact with each other in the inner pipe (1) expanding step, but this close contact state is maintained by the separation preventing means until the end of the brazing step. Inner fin (4) and inner and outer tubes (1) (2)
And brazed. As a result, poor joining between the inner fin and the inner and outer tubes due to the expansion of the butting portion (24) of the outer tube (2) is prevented.
実施例 次に、この発明の実施例を第１図〜第14図に基いて説
明する。なお実施例はこの発明を自動車用水冷オイルク
ーラーの製造方法に適用した場合を示している。Embodiment Next, an embodiment of the present invention will be described with reference to FIGS. The embodiment shows a case where the present invention is applied to a method of manufacturing a water-cooled oil cooler for an automobile.
まず、第１図〜第５図に示すように、熱交換器構成部
材としての内管（１）、外管（２）、アルミニウム製の
オフセットインナーフィン（４）を用意する。内管
（１）は心材（11）（第５図に示す）の外面あるいは内
外両面にろう材（12）が被覆されたアルミニウムブレー
ジングシートをその両側縁衝き合わせ部（14）を電縫溶
接した電縫管を用いる。また、内管（１）の両端にはフ
レア加工により外管内径にほぼ等しい外径の拡管部（1
3）（13）を形成しておく。First, as shown in FIGS. 1 to 5, an inner tube (1), an outer tube (2), and an offset inner fin (4) made of aluminum are prepared as heat exchanger constituent members. The inner pipe (1) is made of an aluminum brazing sheet having a brazing material (12) coated on the outer surface or the inner and outer surfaces of a core material (11) (shown in FIG. 5), and the edge joining portions (14) of the aluminum brazing sheet are welded by electric resistance welding. Use an electric resistance welded tube. In addition, both ends of the inner pipe (1) are expanded by flaring to form an expanded pipe (1
3) Form (13).
一方、外管（２）は次のようにして製作する。即ち、
まず第６図及び第７図に示すように、アルミニウムから
なる心材（21）の内面または内外両面にろう材層（22）
を被覆形成した所定の大きさのブレージングシート（2
3）を用意する。ろう材層（22）としては一般的にはSi
含有量約６〜13wt％程度のAl−Si系合金を用いる。次に
上記ブレージングシート（23）の幅方向の両側端部を肉
厚方向にハンマーないしはプレスで打撃する。この打撃
は一方の端部については下面において、他方の端部につ
いては上面において行うことにより、第８図に示すよう
に、一方の側端部については下縁から上縁に向けて漸次
肉薄となる傾斜面（23a）を形成せしめ、また他方の側
端部については上縁から下縁に向けて漸次肉薄となる傾
斜面（23b）を形成せしめる。しかもいずれの傾斜面に
もろう材層（22）が存在するものとなる。ブレージング
シート（23）の両側端部をこのように形成することで、
第５図に示すように、両側縁を衝き合わせ状となした際
に、衝き合わせ部（24）が重なり状に合致してその当接
面にろう材層（22）を介在させることができ、その後の
ろう付により衝き合わせ部（24）の十分な接合を保証す
ることができる。次に、第９図に示すように、ブレージ
ングシート（23）の幅方向の中央部を長さ方向に沿って
プレスにより断面半円弧状に膨出成形して膨出部（25）
を形成する。次に第10図に示すように、膨出部（25）
に、オイル入口管取付孔（５）と同出口管取付孔（６）
を該膨出部（25）の長さ方向の両端部に穿設する。な
お、必要に応じてこれら取付孔の周端部には予めこれを
絞り加工して外方突出状のボスを形成しておく。上記の
孔開けは、膨出部（25）の形状に適合する形状の当て型
を下面側からあてがってプレスにより行ったものであ
る。こうすることにより膨出部（25）の圧潰や変形の発
生を防止でき、適正な位置に寸法精度の高い取付孔を穿
設することができる。もとより孔開けはミーリング加工
等により行っても良い。続いて必要に応じて面打ちを行
った後、ブレージングシート（23）の膨出部（25）を除
く両側水平部（26）を、プレスにより第11図に示すよう
に断面Ｕ字状をなすように成形した後、両側縁が衝き合
わせ状となるようにプレスにより外力を付与しながら丸
パイプ形状に成形する。次いで、第12図に示すように衝
き合わせ部（24）の複数箇所をアルゴン溶接によりスポ
ット溶接し衝き合わせ部（24）の離間防止手段を設けて
所期する外管（２）を得る。なお、第12図の（27）は離
間防止手段としてのスポット溶接部である。On the other hand, the outer tube (2) is manufactured as follows. That is,
First, as shown in FIGS. 6 and 7, a brazing material layer (22) is formed on the inner surface or inner and outer surfaces of a core material (21) made of aluminum.
Brazing sheet (2)
3) Prepare. The brazing material layer (22) is generally made of Si
An Al-Si alloy having a content of about 6 to 13 wt% is used. Next, both ends in the width direction of the brazing sheet (23) are hit with a hammer or a press in the thickness direction. This impact is performed on the lower surface of one end and on the upper surface of the other end, and as shown in FIG. 8, the thickness of one side is gradually reduced from the lower edge to the upper edge. An inclined surface (23a) is formed, and an inclined surface (23b) that gradually becomes thinner from the upper edge toward the lower edge is formed at the other side end. In addition, the brazing material layer (22) exists on any of the inclined surfaces. By forming both ends of the brazing sheet (23) in this way,
As shown in FIG. 5, when the two side edges are in the form of an abutting portion, the abutting portion (24) is overlapped and a brazing material layer (22) can be interposed on the contact surface. A sufficient joining of the butting part (24) can be guaranteed by subsequent brazing. Next, as shown in FIG. 9, the central portion in the width direction of the brazing sheet (23) is bulged into a semicircular cross-section by pressing along the length direction to form a bulged portion (25).
To form Next, as shown in FIG.
The oil inlet pipe mounting hole (5) and the outlet pipe mounting hole (6)
Are pierced at both ends in the length direction of the bulging portion (25). In addition, if necessary, these mounting holes are drawn in advance at their peripheral ends to form outwardly projecting bosses. The above-mentioned perforation is performed by pressing a pressing die having a shape conforming to the shape of the bulging portion (25) from the lower surface side. By doing so, it is possible to prevent the bulging portion (25) from being crushed or deformed, and it is possible to form a mounting hole with high dimensional accuracy at an appropriate position. The holes may be formed by milling or the like. Subsequently, after beveling is performed as required, the horizontal portions (26) on both sides except for the bulging portion (25) of the brazing sheet (23) are formed into a U-shaped cross section by pressing as shown in FIG. Then, while applying an external force by a press so that both side edges become abutted, the shape is formed into a round pipe shape. Next, as shown in FIG. 12, a plurality of portions of the butting portion (24) are spot-welded by argon welding to provide separation preventing means for the butting portion (24) to obtain a desired outer tube (2). Incidentally, FIG. 12 (27) shows a spot welded portion as a separation preventing means.
こうして製作した外管（２）と内管（１）とインナー
フィン（４）を用いて熱交換器に組立てる。組立は次の
ようにして行う。即ち、第２図のようにまず上記のイン
ナーフィン（４）を矢印（Ａ）の方向に湾曲するととも
に内管（１）の外周面に添わせて配置したのち、これら
内管（１）とインナーフィン（４）とを外管（２）の内
部に挿入し、熱交換器組立体（20）とする。The outer tube (2), the inner tube (1), and the inner fin (4) thus manufactured are assembled into a heat exchanger. Assembly is performed as follows. That is, as shown in FIG. 2, the inner fin (4) is first curved in the direction of the arrow (A) and arranged along the outer peripheral surface of the inner tube (1). The inner fin (4) is inserted into the outer tube (2) to form a heat exchanger assembly (20).
次いで、第１図に示すように、拡管用マンドレル（3
0）を内管（１）に挿入することにより内管（１）を長
さ方向に亘って拡管する。拡管時に外管（２）には半径
方向の圧力が加わるが、外管（２）の衝き合わせ部（2
4）にはスポット溶接を施してあるから、衝き合わせ部
が拡開することはない。この拡管によって、熱交換媒体
流通空間（３）が狭められ、インナーフィン（４）は内
管（１）、外管（２）と密着する。Then, as shown in FIG. 1, the mandrel for pipe expansion (3
0) is inserted into the inner tube (1) to expand the inner tube (1) in the longitudinal direction. Radial pressure is applied to the outer tube (2) when expanding the tube, but the butting portion (2
4) is spot welded, so the abutting part does not expand. Due to this expansion, the heat exchange medium circulation space (3) is narrowed, and the inner fin (4) comes into close contact with the inner tube (1) and the outer tube (2).
次に、上記の拡管を施した熱交換器組立物を加熱し、
内外管（１）（２）のろう材を溶融して、内外管（１）
（２）を長さ方向両端部においてろう付接合するととも
に、内外管（１）（２）とインナーフィン（４）とをろ
う付接合し、第３図〜第５図に示すように熱交換器完成
品となす。ろう付方法としては真空ろう付を始め任意の
ろう付法を採用すれば良い。外管（２）の衝き合わせ部
（24）は拡管後はもとよりろう付工程においてもスポッ
ト溶接部によりその拡開が防止されているから、インナ
ーフィン（４）は内外管（１）（２）と密着した状態が
保持され、この状態のままろう付される。その結果ほぼ
100％あるいはそれに近い接合率が達成される。また、
外管（２）の衝き合わせ部（24）のスポット溶接部以外
の非溶接部分はこのろう付工程において必然的に接合さ
れるが、外管（２）はその製作段階でブレージングシー
ト（23）の両側端部（23a）（23b）を打撃して漸次肉薄
状態に圧潰してあるから、筒状成形後は衝き合わせ部
（24）が重なり状態に合致し、かつ当接面相互間にろう
材層が存在しているから、衝き合わせ部（24）の接合を
一層確実かつ十分に保証できる。なお、第３図及び第４
図に示す（７）（８）は上記のろう付と同時に接合しあ
るいはろう付後に別途溶接したオイル入口管と同出口管
である。Next, the heat exchanger assembly subjected to the expansion is heated,
Melting the brazing material of the inner and outer pipes (1) and (2),
(2) is brazed at both ends in the longitudinal direction, and the inner and outer tubes (1) and (2) are brazed to the inner fin (4), and heat exchange is performed as shown in FIG. 3 to FIG. It is a finished product. Any brazing method such as vacuum brazing may be employed as the brazing method. Since the abutting portion (24) of the outer tube (2) is prevented from being expanded by the spot welded portion in the brazing process as well as after the expansion, the inner fin (4) is formed of the inner and outer tubes (1) and (2). Is maintained, and brazing is performed in this state. As a result almost
A joining rate of 100% or closer is achieved. Also,
The non-welded portion of the butted portion (24) of the outer tube (2) other than the spot-welded portion is inevitably joined in this brazing step, but the outer tube (2) is made of a brazing sheet (23) in its manufacturing stage. Since both side edges (23a) and (23b) are crushed gradually into a thin state, the abutting portion (24) conforms to the overlapping state after the cylindrical forming, and the space between the contact surfaces is reduced. Since the material layer exists, the joining of the butting portion (24) can be more reliably and sufficiently assured. FIG. 3 and FIG.
(7) and (8) shown in the figure are an oil inlet pipe and an oil outlet pipe which are joined together with the above-mentioned brazing or separately welded after brazing.
上記により製作した熱交換器は、自動車用ラジエータ
ーのタンク部等に組込まれて使用される。そして、入口
管（７）からオイル流通空間（３）に流入したオイルは
インナーフィン（４）を含むオイル流通空間（３）を流
通する過程で、外管（２）の周囲及び内管（１）内部を
流通する水と熱交換を行い、冷却されて出口管（８）か
ら器外へと流出する。The heat exchanger manufactured as described above is used by being incorporated in a tank portion or the like of a radiator for an automobile. The oil flowing from the inlet pipe (7) into the oil flow space (3) flows through the oil flow space (3) including the inner fins (4), and flows around the outer pipe (2) and the inner pipe (1). ) It exchanges heat with the water flowing inside, cools and flows out of the vessel through the outlet pipe (8).
以上の実施例では内管の拡管工程から熱交換器組立物
がろう付されるまでの間、外管（２）の衝き合わせ部
（24）の離間を防止する手段として、スポット溶接によ
り衝き合わせ部の数箇所を金属的に接合した場合を示し
たが、離間防止手段はこれに限定されるものではない。
例えば、第13図に示すように、外管（２′）の外周複数
箇所をワイヤー（40）等で締結して機械的に固定してお
き、この状態で内管の拡管とろう付を行い、必要に応じ
てろう付後にワイヤー（40）を外すものとしても良い。
また、第14図に示すように、外管（２″）の衝き合わせ
部両側縁に相互に嵌合可能な楔状突片（41）と切欠き
（42）を交互に設け、これらを互いに嵌合して離間防止
を図っても良く、その他衝き合わせ部の離間を拡管工程
からろう付されるまで防止しうる態様であれば各種の手
段を採用可能である。In the above embodiment, as a means for preventing separation of the butting portion (24) of the outer tube (2) from the step of expanding the inner tube to the time when the heat exchanger assembly is brazed, butting by spot welding is performed. Although the case where several parts of the part are joined by metal is shown, the separation preventing means is not limited to this.
For example, as shown in FIG. 13, a plurality of outer peripheral portions of the outer tube (2 ') are fastened mechanically with a wire (40) or the like, and the inner tube is expanded and brazed in this state. If necessary, the wire (40) may be removed after brazing.
As shown in FIG. 14, wedge-shaped projections (41) and notches (42) that can be fitted to each other are alternately provided on both side edges of the butting portion of the outer tube (2 ″), and these are fitted to each other. In addition, various means may be adopted as long as the separation can be prevented until the abutting portion is separated from the pipe expanding step until brazing.
発明の効果 以上説明したように、この発明は、アルミニウムシー
トからなる外管にその衝き合わせ部の離間防止手段を設
け、この状態で拡管工程とろう付工程とを実施するもの
である。従って、拡管工程後の内外管とインナーフィン
との密着状態を保持したままろう付を行うことができ、
接合予定部分を離間を生じることなくほぼ完全かつ十分
に接合することができる。この結果、優れた熱交換効率
を有する高性能の熱交換器の製作提供が可能となる。Effect of the Invention As described above, in the present invention, an outer tube made of an aluminum sheet is provided with means for preventing separation of the abutting portion, and in this state, the tube expanding step and the brazing step are performed. Therefore, brazing can be performed while maintaining the close contact between the inner and outer pipes and the inner fins after the pipe expansion step,
The parts to be joined can be joined almost completely and sufficiently without any separation. As a result, it is possible to manufacture and provide a high-performance heat exchanger having excellent heat exchange efficiency.
第１図はこの発明の一実施例に係るオイルクーラー用熱
交換器組立体の拡管前の状態を示す一部破断縦断面図、
第２図は内管とインナーフィンを外管に挿入する前の状
態を示す斜視図、第３図は熱交換器完成品の正面図、第
４図はオイル入口管側から見た熱交換器完成品の側面
図、第５図は第３図のIII−III線断面図、第６図は外管
構成用のブレージングシートの斜視図、第７図は第６図
のVII−VII線断面図、第８図はブレージングシートの両
側端部を打撃した後の断面図、第９図はブレージングシ
ートへの膨出部形成後の斜視図、第10図はオイル出入口
管取付孔の穿孔後の斜視図、第11図は断面Ｕ字状に成形
した後の斜視図、第12図は筒状成形後の斜視図、第13図
は外管衝き合わせ部の離間防止手段の変形例を示す斜視
図、第14図は外管衝き合わせ部の離間防止手段の他の変
形例を示す斜視図、第15図は従来の製造方法における拡
管工程を説明するための斜視図である。 （１）……内管、（２）……外管、（３）……熱交換媒
体（オイル）流通空間、（４）……インナーフィン、
（24）（24′）（24″）……衝き合わせ部、（27）……
スポット溶接部、（40）……ワイヤー、（41）……楔状
突片、（42）……楔状切欠き（（27）（40）（41）（4
2）は離間防止手段）。FIG. 1 is a partially broken longitudinal sectional view showing a state before expansion of an oil cooler heat exchanger assembly according to an embodiment of the present invention;
FIG. 2 is a perspective view showing a state before the inner pipe and the inner fin are inserted into the outer pipe, FIG. 3 is a front view of the completed heat exchanger, and FIG. 4 is a heat exchanger viewed from the oil inlet pipe side. FIG. 5 is a sectional view taken along the line III-III of FIG. 3, FIG. 6 is a perspective view of a brazing sheet for forming an outer tube, and FIG. 7 is a sectional view taken along the line VII-VII of FIG. FIG. 8 is a cross-sectional view of the brazing sheet after striking both ends, FIG. 9 is a perspective view of the brazing sheet after forming a bulging portion, and FIG. 10 is a perspective view of the oil inlet / outlet pipe mounting hole after drilling. Fig. 11, Fig. 11 is a perspective view after being formed into a U-shaped cross section, Fig. 12 is a perspective view after being formed into a cylindrical shape, and Fig. 13 is a perspective view showing a modification of the separation preventing means of the outer tube abutting portion. FIG. 14 is a perspective view showing another modified example of the means for preventing separation of the outer tube abutting portion, and FIG. 15 is a perspective view for explaining a tube expanding step in a conventional manufacturing method. It is. (1) ... inner tube, (2) ... outer tube, (3) ... heat exchange medium (oil) circulation space, (4) ... inner fin,
(24) (24 ') (24 ") ... butting part, (27) ...
Spot weld, (40) Wire, (41) Wedge-shaped protruding piece, (42) Wedge-shaped notch ((27) (40) (41) (4
2) means for preventing separation).
Claims (1)
ウムシートをその両側縁部が衝き合わせ状となるように
筒状に成形した外管（２）とを同軸に配置するととも
に、内外両管の間の熱交換媒体流通空間（３）にアルミ
ニウム製のインナーフィンを装填したのち、内管（１）
を長さ方向に亘って拡管し、次いでろう付により内外管
（１）（２）とインナーフィン（４）とを接合するアル
ミニウム製二重管式熱交換器の製造方法であって、少な
くとも前記拡管からろう付までの工程を、前記外管
（２）にその衝き合わせ部（24）の離間防止手段を設け
た状態で行うことを特徴とするアルミニウム製二重管式
熱交換器の製造方法。An inner tube (1) made of aluminum and an outer tube (2) formed by shaping an aluminum sheet into a tubular shape so that both side edges of the inner tube come into contact with each other are coaxially arranged. After the inner fin made of aluminum is loaded into the heat exchange medium flow space (3) between the tubes, the inner tube (1)
Of a double-pipe heat exchanger made of aluminum in which the inner and outer pipes (1) and (2) are joined to the inner fin (4) by brazing, and the inner pipe and the inner fin (4) are joined by brazing. A method for manufacturing an aluminum double-pipe heat exchanger, wherein the steps from expansion to brazing are performed in a state in which the outer pipe (2) is provided with means for preventing separation of the butting portion (24). .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1308560A JP2766532B2 (en) | 1989-11-27 | 1989-11-27 | Manufacturing method of aluminum double-pipe heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1308560A JP2766532B2 (en) | 1989-11-27 | 1989-11-27 | Manufacturing method of aluminum double-pipe heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03169440A JPH03169440A (en) | 1991-07-23 |
| JP2766532B2 true JP2766532B2 (en) | 1998-06-18 |
Family
ID=17982499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1308560A Expired - Lifetime JP2766532B2 (en) | 1989-11-27 | 1989-11-27 | Manufacturing method of aluminum double-pipe heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2766532B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101253465B1 (en) | 2012-12-14 | 2013-04-10 | 권용무 | Viton-ring application type pipe expension apparatus, and manufacturing method for double pipe of heat exchange using the same |
| KR20130093275A (en) * | 2012-02-14 | 2013-08-22 | 한국델파이주식회사 | Manufacturing method of transmission oil cooler for vehicle and transmission oil cooler for vehicle |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112045379A (en) * | 2020-09-24 | 2020-12-08 | 上海宇洋特种金属材料有限公司 | Method for manufacturing high-efficiency heat exchange tube of high-pressure boiler |
| CN112146077A (en) * | 2020-09-24 | 2020-12-29 | 上海宇洋特种金属材料有限公司 | High-efficiency internal tooth high-pressure boiler tube |
| CN115041599B (en) * | 2022-05-23 | 2024-06-18 | 中国成达工程有限公司 | Integral process for forming and installing horn mouth of internal expansion type honeycomb duct |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0371943A (en) * | 1989-08-09 | 1991-03-27 | Showa Alum Corp | Double tube heat exchanger of aluminum |
| JPH0371942A (en) * | 1989-08-09 | 1991-03-27 | Showa Alum Corp | Double tube heat exchanger of aluminum |
-
1989
- 1989-11-27 JP JP1308560A patent/JP2766532B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130093275A (en) * | 2012-02-14 | 2013-08-22 | 한국델파이주식회사 | Manufacturing method of transmission oil cooler for vehicle and transmission oil cooler for vehicle |
| KR101648902B1 (en) * | 2012-02-14 | 2016-08-17 | 이래오토모티브시스템 주식회사 | Manufacturing method of transmission oil cooler for vehicle and transmission oil cooler for vehicle |
| KR101253465B1 (en) | 2012-12-14 | 2013-04-10 | 권용무 | Viton-ring application type pipe expension apparatus, and manufacturing method for double pipe of heat exchange using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03169440A (en) | 1991-07-23 |
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