JPH01249261A - Manufacture of aluminum made lamination type heat exchanger - Google Patents
Manufacture of aluminum made lamination type heat exchangerInfo
- Publication number
- JPH01249261A JPH01249261A JP7323288A JP7323288A JPH01249261A JP H01249261 A JPH01249261 A JP H01249261A JP 7323288 A JP7323288 A JP 7323288A JP 7323288 A JP7323288 A JP 7323288A JP H01249261 A JPH01249261 A JP H01249261A
- Authority
- JP
- Japan
- Prior art keywords
- brazing
- rib
- heat exchanger
- ribs
- hole
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 10
- 229910052782 aluminium Inorganic materials 0.000 title claims description 10
- 238000003475 lamination Methods 0.000 title abstract 2
- 238000005219 brazing Methods 0.000 claims abstract description 61
- 230000004907 flux Effects 0.000 claims description 24
- 230000009972 noncorrosive effect Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 12
- 239000011261 inert gas Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000005304 joining Methods 0.000 abstract description 5
- 230000008020 evaporation Effects 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 230000006378 damage Effects 0.000 abstract 1
- 239000000945 filler Substances 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 11
- 238000005238 degreasing Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 102100030672 ADP-ribosylation factor-like protein 6-interacting protein 6 Human genes 0.000 description 1
- 101710199056 ADP-ribosylation factor-like protein 6-interacting protein 6 Proteins 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はアルミ製積層型熱交換器の製造方法に関するも
ので、特にドロンカップタイプのエバポレーター等の真
空ろう付けや非腐食性フラックスろう付げにおけるろう
付は性を改善したものである。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for manufacturing an aluminum laminated heat exchanger, and in particular to a method for manufacturing a laminated aluminum heat exchanger, particularly vacuum brazing or non-corrosive flux brazing of a doron cup type evaporator. Brazing is improved in properties.
積層型熱交換器、例えば積層型のエバポレーターは第3
図に示すように、ブレージングシート(JIS 300
3からなる芯材の両面にJIS 4004からなるろう
材をクラッドしたもの)をプレス成形して、タンク部と
インナーリブ部を有するチューブシート(2)、(2’
)を形成し、これを1枚1枚逆向きに積層してチューブ
シート間に純/1やJIS 3003のベア材からなる
アウターフィン(1)を配設し、これを治具に組込む前
のすき間がおる状況で、有機溶剤により洗浄し、その後
治具に組込み、予熱乾燥した後、tO−5Torr程度
の真空中で600°Cに5分冊位加熱して真空ろう付け
を行なっている。積層型のエバポレータに使用されるブ
レージングシートには板厚0.5〜0.6簡程度のもの
が、またフィンには板厚0.1m程度のものか用いられ
ている。A stacked heat exchanger, such as a stacked evaporator, has a third
As shown in the figure, brazing sheet (JIS 300
Tube sheets (2), (2'
), stack them one by one in the opposite direction, and place an outer fin (1) made of JIS/1 or JIS 3003 bare material between the tube sheets, and then install the In the situation where there is a gap, it is cleaned with an organic solvent, then assembled into a jig, preheated and dried, and then vacuum brazed by heating about 5 volumes to 600°C in a vacuum of about tO-5 Torr. The brazing sheets used in laminated evaporators have a thickness of about 0.5 to 0.6 m, and the fins have a thickness of about 0.1 m.
一方アルミ部材のろう付けにフッ化物系フラックスを使
用した非腐食性フラックスろう付は法が行なわれるよう
になり、従来の塩化物系フラックスを使用するろう付は
法に比較し、前処理が溶剤脱脂で十分であり、後処理の
必要がないところから、そのコスト的メリットが注目さ
れ、アルミ製ラジェーターやコンデンサーのろう付けに
採用されている。非腐食性フラックスろう付けの工程は
、通常5%程度の非腐食性フラックスを含むフラックス
液をスプレー等により熱交換器に塗布し、その後200
℃程度の温度で屹燥後、露点−40℃以下、酸素濃度1
1000pl)以下の〜ガス中で600℃に59程度加
熱して行なわれる。しかし上記中空構造の熱交換器の適
用に際しては非腐食性フラックスの塗布方法が確立され
てあらず、実用化に至っていない。On the other hand, non-corrosive flux brazing methods using fluoride-based fluxes are now being used for brazing aluminum parts, and compared to conventional brazing methods that use chloride-based fluxes, pretreatment is required using solvents. Since degreasing is sufficient and there is no need for post-treatment, its cost advantages have attracted attention, and it has been adopted for brazing aluminum radiators and condensers. The non-corrosive flux brazing process involves applying a flux liquid containing about 5% non-corrosive flux to the heat exchanger by spraying, etc.
After drying at a temperature of about ℃, the dew point is -40℃ or less and the oxygen concentration is 1.
The process is carried out by heating to 600° C. in a gas of up to 1,000 pl). However, when applying the above-mentioned hollow structure heat exchanger, a method for applying non-corrosive flux has not been established and has not been put to practical use.
ドロンカップタイプのエバポレーター等積層型熱交換器
の真空ろう付けではチューブシート内部のリブ同志やフ
ランジ内側の接合が炉の真空度や温度等、条件の変化の
影響を受け、ろう付は性が変動する場合がある。このよ
うな場合耐圧強度の低下や疲労寿命(内圧の変化による
)の低下が問題となる。When vacuum brazing laminated heat exchangers such as Dron cup type evaporators, the joints between the ribs inside the tube sheet and the inside of the flanges are affected by changes in conditions such as the degree of vacuum and temperature of the furnace, and the brazing properties fluctuate. There are cases where In such cases, problems arise such as a decrease in pressure resistance and a decrease in fatigue life (due to changes in internal pressure).
非腐食性フラックスろう付は法で積層型熱交換器を作成
するには、アウターフィンやチューブシートを1枚1枚
フラックスを塗布し、乾燥後コア組みするか、コア組み
後、コア内部にもフラックスがいきわたるように浸漬塗
布する必要があり、何れの場合もフラックス付着量が多
くなるばかりか、特に俊者では冷媒回路が複雑な場合、
塗布が不完全になるか、乾燥不十分となり、ろう付は性
が低下することがさけられない。To create a laminated heat exchanger using non-corrosive flux brazing, flux is applied to each outer fin and tube sheet, and after drying, the core is assembled, or after the core is assembled, the inside of the core is also coated. It is necessary to apply the flux by dipping so that it spreads, and in both cases, not only does the amount of flux increase, but especially in cases where the refrigerant circuit is complex,
The brazing properties inevitably deteriorate due to incomplete application or insufficient drying.
(課題を解決するための手段)
本発明はこれに鑑み種々検討の結果、真空ろう付けと非
腐食性フラックスろう付けの何れにおいても積層型熱交
換器の内部におけるろう付は性を安定化し、耐圧強度を
向上させることができるアルミ製積層型熱交換器の製造
方法を開発したものである。(Means for Solving the Problems) In view of this, as a result of various studies, the present invention stabilizes the properties of brazing inside a laminated heat exchanger in both vacuum brazing and non-corrosive flux brazing, We have developed a manufacturing method for aluminum laminated heat exchangers that can improve pressure resistance.
即ち本発明の一つは、ブレージングシートをプレス成形
しインナーリブ付チューブシートを形成し、これを積層
してチューブシート間にアウターフィンを配設し、コア
組みしてろう付けにより接合するアルミ製積層型熱交換
器の製造において、チューブシートのインナーリブ同志
が接触する部分のリブの片側又は両側に穴を設け、真空
中で加熱ろう付けすることを特徴とするものである。That is, one of the present inventions is to press-form a brazing sheet to form a tube sheet with inner ribs, laminate the sheets, arrange outer fins between the tube sheets, assemble the core, and join by brazing. In manufacturing a laminated heat exchanger, holes are provided on one or both sides of the ribs where the inner ribs of the tube sheet come into contact with each other, and heat brazing is performed in a vacuum.
また本発明の他の一つは、ブレージングシートをプレス
成形しインナーリブ付チューブシートを形成し、これを
積層してチューブシート間にアウターフィンを配設し、
コア組みしてろう付けにより接合するアルミ製積層型熱
交換器の製造において、チューブシートのインナーリブ
同志が接触する部分のリブの片側又は両側に穴を設け、
コア組立侵外側より非腐食性フラックスを塗布乾燥し、
不活性ガス中で加熱ろう付けすることを特徴とするもの
である。Another aspect of the present invention is to press-form a brazing sheet to form a tube sheet with inner ribs, and to laminate the sheets and arrange outer fins between the tube sheets.
In the manufacture of aluminum laminated heat exchangers in which cores are assembled and joined by brazing, holes are provided on one or both sides of the ribs where the inner ribs of the tube sheet come into contact with each other.
Apply non-corrosive flux from the invasive side of the core assembly and dry.
It is characterized by heat brazing in an inert gas.
本発明は、第1図(イ)、(ロ)及び第2図に示すよう
に、ブレージングシートからなるインナーリブ(3)、
タンク(5)を形成したチューブシート(2)、 (2
°)のインナーリブ(3)同志が接触する部分の片側又
は両側に穴(4)を設け、真空ろう付は又は非腐食性フ
ラックスろう付けを行なうもので、従来外側のろう材は
アウターフィン(1)の接合に使用される量はわずかで
、チューブシート(2)、 (2°)の接合に使用され
る以外は、インナーリブ(3)を形成した凹部にたまる
だけであるが、チューブシート(2)、 (2°)のイ
ンナーリブ(3)同志の接触部に片側又は両側に穴(4
)を設けることにより、該穴(4)を通して内部に流入
し、インナーリブ(3)の接合性を改善する。As shown in FIGS. 1A and 2B, the present invention provides an inner rib (3) made of a brazing sheet,
Tube sheet (2) forming tank (5), (2
A hole (4) is provided on one or both sides of the part where the inner ribs (3) of the inner ribs (3) contact each other, and vacuum brazing or non-corrosive flux brazing is performed. The amount used for joining 1) is small, and other than the amount used for joining tube sheets (2) and (2°), it only accumulates in the recesses that formed the inner ribs (3), but the tube sheet (2), (2°) inner rib (3) hole (4) on one or both sides of the contact area
), it flows into the interior through the hole (4) and improves the bondability of the inner rib (3).
また従来面接触状態のリブ接合部のろう付は性はクリア
ランス等が微妙に影響するがリブ接合部に穴を設けるこ
とにより、ろう材からのM9の蒸発がチューブシート内
部でも促進され、酸化皮膜の破壊が容易になるばかりで
なく、ろう付は加熱における内部の排気性能をも向上し
、内部ろう付は性を向上する。更にコア組み後、コアの
外部から非腐食性フラックスを液スプレーとして塗布す
るだけで、リブ内側にもリブに形成した穴からフラック
スが内部に微量浸透し、非腐食性フラックスろう付けが
可能となる。In addition, the performance of conventional brazing of rib joints in surface contact is slightly affected by clearance, etc., but by providing holes in the rib joints, the evaporation of M9 from the brazing metal is promoted inside the tube sheet, and the oxide film is formed. Not only is it easier to destroy, but brazing also improves the internal exhaust performance during heating, and internal brazing improves the properties. Furthermore, after assembling the core, by simply applying non-corrosive flux as a liquid spray from the outside of the core, a small amount of flux will penetrate into the inside of the rib through the holes formed in the rib, making it possible to perform non-corrosive flux brazing. .
インナーリブに設ける穴は、リブの幅に応じて大きくす
ることができる。しかしリブ幅を越えて大きくするとろ
う付は時にろう材によって内部と外部が区切られなくな
り、冷媒回路を形成することができなくなる。即ちリブ
に穴がおいてしまうことになる。穴の形状は円、だ円、
正方形、長方形等間らゆる形状を適用することができる
。例えば円の場合直径0.5m以上が望ましい。穴の直
径が0,5#未満ではろう材の流入やフラックスの浸透
に支障をきたし、ろう付は性の向上が認められないため
でおる。The hole provided in the inner rib can be made larger depending on the width of the rib. However, if the width exceeds the rib width, the inside and outside are sometimes no longer separated by the brazing material, making it impossible to form a refrigerant circuit. In other words, a hole will be left in the rib. The shape of the hole is circular, oval,
Any shape such as square, rectangle etc. can be applied. For example, in the case of a circle, a diameter of 0.5 m or more is desirable. This is because if the diameter of the hole is less than 0.5mm, the inflow of the brazing material and penetration of the flux will be hindered, and no improvement in brazing properties will be observed.
実施例(1)
JIS 3003材を芯材とし、その両面にJIS 4
004ろう材を15%クラッドした厚さ0.6mのブレ
ージングシートからなるインナーリブ付チューブシート
と、JIS 3003材からなる厚さ0.1#のアウタ
ーフィンを用い、第3図に示す積層型エバポレータの真
空ろう付はテストを行ない、そのろう付は性を評価した
。その結果を第1表に示す。Example (1) JIS 3003 material is used as the core material, and JIS 4 material is used on both sides.
The laminated evaporator shown in Fig. 3 was constructed using an inner ribbed tube sheet made of a 0.6 m thick brazing sheet clad with 15% 004 brazing material and a 0.1 # thick outer fin made of JIS 3003 material. The vacuum brazing of was tested and the properties of the brazing were evaluated. The results are shown in Table 1.
即ち、第1図(イ)(ロ)及び第2図に示すようにチュ
ーブシート(2)、 (2’)を重ねたとき、インナー
リブ(3)同志が接触するチューブシートの片側又は両
側に直径0.3〜2姻の穴(4)を設け、これをアウタ
ーフィン(1)と伴に積層してを配設した。これをトリ
クレンで脱脂した後乾燥し、治具により締付け、5 X
10−5 TOrrの真空中で600℃に5分間加熱
し、真空ろう付けを行なった。ろう付は性はリブの接合
長さで評価した。In other words, when the tube sheets (2) and (2') are stacked as shown in Figures 1 (a) and (b) and 2, the inner ribs (3) are placed on one or both sides of the tube sheets where they are in contact with each other. Holes (4) with a diameter of 0.3 to 2 were provided, and these were laminated together with the outer fin (1). After degreasing this with Triclean, dry it, tighten it with a jig, and tighten it with 5X
Vacuum brazing was performed by heating at 600°C for 5 minutes in a vacuum of 10-5 Torr. Brazing performance was evaluated by the joint length of the ribs.
第1表から明らかなように、本発明方法Nα1〜6によ
るものは、何れもリブ穴を設けない従来方法Nα8と比
較し、リブ接合部の接合長さが長く、ろう付は性が優れ
ていることが判る。As is clear from Table 1, all of the methods Nα1 to Nα6 of the present invention have longer joint lengths at rib joints and superior brazing properties compared to the conventional method Nα8 in which no rib holes are provided. I know that there is.
これに対しリブに設けた穴の径が0.3mと小さい比較
方法Nα7では、ろう付は性の改善が認められないこと
が判る。On the other hand, in comparison method Nα7, in which the diameter of the hole provided in the rib is as small as 0.3 m, it can be seen that no improvement in brazing properties is observed.
実施例(2)
JIS 3003材を芯材とし、その両面にJIS 4
045ろう材を15%クラッドした厚さ0.6Mのブレ
ージングシートからなるインナーリブ付チューブシート
とJIS 3003材からなる厚ざ0.1#のアウター
フィンを用い、第3図に示す積層型エバポレーターの非
腐食性フしツクスろう付はテストを行ない、そのろう付
は性を評価した。その結果を第2表に示す。Example (2) JIS 3003 material is used as the core material, and JIS 4 material is used on both sides.
Using an inner ribbed tube sheet made of a 0.6M thick brazing sheet clad with 15% 045 brazing material and a 0.1# thick outer fin made of JIS 3003 material, a laminated evaporator as shown in Fig. 3 was constructed. Non-corrosive brazes were tested and the brazes evaluated for their properties. The results are shown in Table 2.
即ちチューブシートを実施例(1)と同様に重ね合せた
とき、インナーリブ同志が接触するチューブシートの片
側又は両側に0.3〜2Mの穴を設け、これを重ね合せ
てチューブシートを形成し、これをアウターフィんと伴
に積層して配設した。これをトリクレンで脱脂した後、
治具により締付け、非腐食性フラックス(KAj!F4
とに:+AIP6の共晶組成の5%水溶液)をスプレー
塗布して乾燥し、沖ガス中600℃で5分間加熱し、非
腐食性フラックスろう付けを行なった。ろう付は性は実
施例(1)と同様リブの接合長さにより評価した。That is, when the tubesheets are stacked in the same manner as in Example (1), holes of 0.3 to 2M are provided on one or both sides of the tubesheet where the inner ribs come into contact with each other, and these are stacked to form the tubesheet. , which were laminated together with the outer fin. After degreasing this with Triclean,
Tighten with a jig and use non-corrosive flux (KAj!F4
Toni:+5% aqueous solution of eutectic composition of AIP6) was spray applied, dried, heated in Oki Gas at 600° C. for 5 minutes, and non-corrosive flux brazing was performed. The brazing quality was evaluated based on the joining length of the ribs as in Example (1).
第2表
第2表から明らかなように、リブに穴を設けない従来方
法Nα16ではリブの接合が得られないが、本発明方法
Nα9〜14によるものは何れもリブ接合部の接合長さ
が長く、ろう付は性か優れていることが判る。Table 2 As is clear from Table 2, ribs cannot be joined using the conventional method Nα16 in which no holes are provided in the ribs, but with the methods Nα9 to 14 of the present invention, the joining length of the rib joints is It can be seen that brazing is superior for a long time.
このように本発明によればアルミ製積層型熱交換器のろ
う付けによる製造方法において、チューブシートの内側
ろう付は性が向上すると共に安定化し、従来実用化され
ていた真空ろう付けによる製造方法において、コアの耐
圧強度を向上し、また従来実用化されていない非腐食性
フラックスろう付げによる製造方法においてもフラック
スの塗布を容易にし、その製造を可能にする等工業上顕
著な効果を奏するものである。As described above, according to the present invention, in the method for manufacturing an aluminum laminated heat exchanger by brazing, the inner brazing of the tube sheet has improved properties and is stabilized, and the manufacturing method using vacuum brazing, which has been put into practical use in the past, can be improved. It has remarkable industrial effects, such as improving the pressure resistance of the core, and making it easier to apply flux and make it possible to manufacture non-corrosive flux brazing, which has not been put into practical use in the past. It is something.
第1図(イ)、(ロ)は本発明製造方法にあける積層型
エバポレーターのコアの要部を示すもので、(イ)は側
断面図、(ロ)は平面図、第2図は同コアの要部を示す
斜視図、第3図は積層型エバポレーターの一例を示す側
面図である。
1.7ウターフイン
2.2’ 、チューブシート
3、インナーリブ
4、穴
5、タンク
第1図
(イ)
(ロ)Figures 1 (a) and (b) show the main parts of the core of a laminated evaporator manufactured by the manufacturing method of the present invention, in which (a) is a side sectional view, (b) is a plan view, and Figure 2 is the same. FIG. 3 is a perspective view showing essential parts of the core, and a side view showing an example of a stacked evaporator. 1.7 Outer fin 2.2', tube sheet 3, inner rib 4, hole 5, tank Figure 1 (A) (B)
Claims (2)
ブ付チューブシートを形成し、これを積層してチューブ
シート間にアウターフィンを配設し、コア組みしてろう
付けにより接合するアルミ製積層型熱交換器の製造にお
いて、チューブシートのインナーリブ同志が接触する部
分のリブの片側又は両側に穴を設け、真空中で加熱ろう
付けすることを特徴とするアルミ製積層型熱交換器の製
造方法。(1) Aluminum laminated heat exchanger in which a brazing sheet is press-molded to form a tube sheet with inner ribs, these are laminated, outer fins are arranged between the tube sheets, a core is assembled, and they are joined by brazing. 1. A method for manufacturing an aluminum laminated heat exchanger, characterized in that holes are provided on one or both sides of the ribs where the inner ribs of the tube sheet come into contact with each other, and then heated and brazed in a vacuum.
ブ付チューブシートを形成し、これを積層してチューブ
シート間にアウターフィンを配設し、コア組みしてろう
付けにより接合するアルミ製積層型熱交換器の製造にお
いて、チューブシートのインナーリブ同志が接触する部
分のリブの片側又は両側に穴を設け、コア組立後外側よ
り非腐食性フラックスを塗布乾燥し、不活性ガス中で加
熱ろう付けすることを特徴とするアルミ製積層型熱交換
器の製造方法。(2) Aluminum laminated heat exchanger in which a brazing sheet is press-molded to form a tube sheet with inner ribs, this is laminated, outer fins are arranged between the tube sheets, a core is assembled, and they are joined by brazing. In manufacturing, holes are made on one or both sides of the ribs where the inner ribs of the tube sheet come into contact with each other, and after the core is assembled, non-corrosive flux is applied from the outside, dried, and then heated and brazed in an inert gas. A manufacturing method for aluminum laminated heat exchangers.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7323288A JPH01249261A (en) | 1988-03-29 | 1988-03-29 | Manufacture of aluminum made lamination type heat exchanger |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7323288A JPH01249261A (en) | 1988-03-29 | 1988-03-29 | Manufacture of aluminum made lamination type heat exchanger |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01249261A true JPH01249261A (en) | 1989-10-04 |
Family
ID=13512233
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7323288A Pending JPH01249261A (en) | 1988-03-29 | 1988-03-29 | Manufacture of aluminum made lamination type heat exchanger |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01249261A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02290668A (en) * | 1989-04-07 | 1990-11-30 | Sanden Corp | Manufacture of tube element and laminated heat exchanger |
US5930894A (en) * | 1995-02-07 | 1999-08-03 | Sanden Corporation | Method for manufacturing heat exchangers |
-
1988
- 1988-03-29 JP JP7323288A patent/JPH01249261A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02290668A (en) * | 1989-04-07 | 1990-11-30 | Sanden Corp | Manufacture of tube element and laminated heat exchanger |
US5930894A (en) * | 1995-02-07 | 1999-08-03 | Sanden Corporation | Method for manufacturing heat exchangers |
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