JPH067873A - Manufacture of heat exchanger - Google Patents
Manufacture of heat exchangerInfo
- Publication number
- JPH067873A JPH067873A JP4155273A JP15527392A JPH067873A JP H067873 A JPH067873 A JP H067873A JP 4155273 A JP4155273 A JP 4155273A JP 15527392 A JP15527392 A JP 15527392A JP H067873 A JPH067873 A JP H067873A
- Authority
- JP
- Japan
- Prior art keywords
- metal
- tube
- expanding
- pressure
- pipe
- 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
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、空気調和機等に使用す
る熱交換器、特に例えばアルミフィンと銅管とを組み合
わせたクロスフィンチューブ式の熱交換器の製造方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used in an air conditioner or the like, and more particularly to a method for manufacturing a cross fin tube type heat exchanger in which aluminum fins and copper tubes are combined.
【０００２】[0002]
【従来の技術】一般に、熱交換器の製造では、金属管の
外径よりも若干大きな内径の孔を放熱フィンに形成して
おき、その孔に金属管を挿入した後、当該金属管を拡管
して放熱フィンと接合させる方法が採用されている。そ
して、金属管の拡管方法としては、金属管の一端からマ
ンドレルを押し込む方法、流路の一端を閉じて他端から
高圧の液体を注入する方法、金属管の一端から液体圧力
によって銅球（ボール）を押し込む方法等がある。この
ほか、金属管の外径より若干小さな内径の孔を放熱フィ
ンに形成しておき、プレス等によって強制的に金属管を
挿入する方法も採用されている。2. Description of the Related Art Generally, in manufacturing a heat exchanger, a hole having an inner diameter slightly larger than the outer diameter of a metal tube is formed in a radiation fin, the metal tube is inserted into the hole, and then the metal tube is expanded. Then, the method of joining with the radiation fin is adopted. And as a method of expanding the metal tube, a method of pushing the mandrel from one end of the metal tube, a method of closing one end of the flow path and injecting a high-pressure liquid from the other end, a copper ball (ball ) There is a method of pushing in. In addition, a method is also adopted in which a hole having an inner diameter slightly smaller than the outer diameter of the metal tube is formed in the heat radiation fin and the metal tube is forcibly inserted by pressing or the like.
【０００３】ところで、ルームエアコンやパッケージ型
エアコンでは、アルミフィンと銅管とを組み合わせたク
ロスフィンチューブ式熱交換器が多く使用されている。
この種の熱交換器は、殆どの場合、マンドレル拡管法を
用いて製造するのが普通であるが、この方法には、次の
ような欠点がある。By the way, in room air conditioners and package type air conditioners, cross fin tube type heat exchangers in which aluminum fins and copper tubes are combined are often used.
In most cases, this type of heat exchanger is usually manufactured by the mandrel expansion method, but this method has the following drawbacks.
【０００４】 マンドレルと銅管内壁面との間の摩擦
軽減のために潤滑油を使用する必要がある。また、若干
の摩耗粉の発生が不可避であり、この摩耗粉が潤滑油と
混合して銅管の内壁面に付着するため、拡管作業終了
後、有機溶剤による洗浄が必要となる。It is necessary to use a lubricating oil to reduce the friction between the mandrel and the inner wall surface of the copper pipe. Further, some abrasion powder is unavoidably generated, and this abrasion powder mixes with the lubricating oil and adheres to the inner wall surface of the copper pipe. Therefore, it is necessary to wash with an organic solvent after the pipe expanding work is completed.
【０００５】 最近は、内面溝付管が多用されている
が、この種の銅管は、内壁面に多数の螺旋状突起（フィ
ン）が形成されているため、平滑管の場合に比較して摩
耗粉の発生が起こり易い。また、マンドレルによって螺
旋状突起の先端が押し潰されて溝の深さが減少する結
果、冷媒（フロン）との間の熱伝達効率が低下する傾向
がある。Recently, an inner grooved tube has been frequently used, but this type of copper tube has a large number of spiral projections (fins) formed on the inner wall surface, so that it is better than a smooth tube. Wear powder is likely to occur. Further, as a result of the tip of the spiral projection being crushed by the mandrel and the depth of the groove being reduced, the efficiency of heat transfer with the refrigerant (CFC) tends to decrease.
【０００６】 拡管後に発生する銅管の縮み代が、拡
管条件の微妙なバラつきによって変化するため、より均
一な銅管特性が要求されるようになり、銅管の製造コス
トの増加を招いている。Since the shrinkage allowance of the copper pipe generated after the pipe expansion changes due to a slight variation in the pipe expansion condition, more uniform copper pipe characteristics are required, and the production cost of the copper pipe increases. .
【０００７】このため、本発明者は、これらの問題点を
解決する有効な手段として先に特願平２−４０４４７号
明細書記載の熱交換器製造方法の発明をした。この発明
によれば、予め金属管挿入用の孔を形成した所要枚数の
放熱フィンを相互に適当なギャップを設けて積層し、当
該フィンに所要本数の金属管を挿入した後、各金属管を
相互に接合して熱媒体用の流路を形成し、当該流路内に
所定量の水を注入して流路の両端を密閉する。その後、
金属管及び放熱フィンからなる組立体の全体を所定の温
度に加熱することにより、水の蒸気圧を用いて金属管を
拡管し、当該金属管を放熱フィンに接合させる。Therefore, the present inventor has previously invented the heat exchanger manufacturing method described in Japanese Patent Application No. 2-40447 as an effective means for solving these problems. According to the present invention, a required number of radiating fins having holes for inserting metal pipes are stacked in advance with a proper gap provided therebetween, and after inserting the required number of metal pipes into the fins, each metal pipe is They are joined to each other to form a flow path for a heat medium, and a predetermined amount of water is injected into the flow path to seal both ends of the flow path. afterwards,
By heating the entire assembly of the metal tube and the heat radiation fin to a predetermined temperature, the metal tube is expanded by using the vapor pressure of water, and the metal tube is joined to the heat radiation fin.
【０００８】この方法は、マンドレル拡管法の場合と異
なり潤滑油を必要としないこと、摩耗粉が発生しないた
め、拡管後の洗浄が不要であること、内面溝付管に適用
しても螺旋状突起の潰れが生じないこと等、多くの点で
優れている。しかも、熱媒体流路に注入した水は、組立
体全体が１００℃を超えている状態で流路端末を開放す
ることにより、水蒸気の状態で大気中に自力で噴出させ
ることが可能であるほか、熱媒体流路に残った水も、不
活性ガス等によるパージを行なうことによって排除する
ことが出来る。しかし、この方法は、残水の完全な排除
に手間が掛かること、若し流路内に水分が残った場合、
当該水分が熱媒体（例えばフロン等）と反応して金属管
腐食の原因となる等の点で若干の問題がある。This method, unlike the case of the mandrel tube expansion method, does not require lubricating oil, does not generate abrasion powder, and therefore does not require cleaning after tube expansion. Even when applied to an inner grooved tube, it has a spiral shape. It is excellent in many respects, including that the protrusions do not collapse. Moreover, the water injected into the heat medium flow path can be ejected by itself into the atmosphere in the form of water vapor by opening the flow path end while the entire assembly is over 100 ° C. The water remaining in the heat medium passage can also be removed by purging with an inert gas or the like. However, this method takes time to completely remove residual water, and if water remains in the flow channel,
There is a slight problem in that the moisture reacts with the heat medium (for example, Freon) and causes corrosion of the metal tube.
【０００９】[0009]
【発明が解決しようとする課題】本発明の目的は、水の
蒸気圧を利用した前記製造方法の問題点を解消し、工業
生産的な取扱が極めて容易であり、かつ、残水による金
属管内面の腐食を伴うことのない更に改良された熱交換
器の製造方法を提供することにある。The object of the present invention is to solve the problems of the above-mentioned manufacturing method utilizing the vapor pressure of water, to make industrial handling extremely easy, and to use the residual water in a metal pipe. It is an object of the present invention to provide a further improved method for manufacturing a heat exchanger without surface corrosion.
【００１０】[0010]
【課題を解決するための手段】上記課題は、水の蒸気圧
の代わりに気体の加熱に伴う圧力を金属管拡管のための
圧力として利用することによって解決することが出来
る。即ち、複数の金属管を相互に接合して形成した熱媒
体用流路内に拡管用気体を封入した後、流路両端を密閉
して金属管及び放熱フィンの全体を所定温度まで加熱す
るのである。この場合、封入気体の圧力Ｐは、温度上昇
に伴い次式に従って変化する。The above problems can be solved by using the pressure associated with the heating of gas as the pressure for expanding the metal tube instead of the vapor pressure of water. That is, after enclosing the gas for expanding the pipe in the heat medium flow passage formed by joining a plurality of metal pipes to each other, both ends of the flow passage are closed to heat the entire metal pipe and the radiation fin to a predetermined temperature. is there. In this case, the pressure P of the enclosed gas changes according to the following equation as the temperature rises.
【数１】Ｐ＝（Ｔ／Ｔ0）Ｐ0 ・・・・・（１） 但し、Ｐ ：温度Ｔ(Ｋ)における封入気体の圧力(Pa) Ｐ0：温度Ｔ0(Ｋ)における封入気体の圧力(Pa)＝初期封
入圧力## EQU1 ## P = (T / T 0 ) P 0 (1) where P is the pressure of the enclosed gas at temperature T (K) (Pa) P 0 is the enclosure at temperature T 0 (K) Gas pressure (Pa) = initial filling pressure
【００１１】式１は、常温（２０℃）で５ＭPaの気体を
金属管に封入して３００℃に加熱した場合、封入気体の
圧力Ｐが９．８ＭPaまで上昇することを表わしている。
もっとも、実際問題として拡管に必要な圧力は、金属管
の破裂圧力よりも小さなものであることが必要がある。
図２は、空気調和機用の伝熱管として一般的に使用され
ている外径９．５２mm、肉厚０．３４mmの銅管に常温
（２０℃）で４．８５ＭPaの拡管用気体を封入して加熱
した場合における封入気体の圧力変化と銅管の外径増大
量及び破裂圧力との関係を示す。同図から明らかなよう
に、銅管の温度が３００℃である場合、封入気体の圧力
と銅管の破裂圧力とがほぼ一致し、その値は約９．３Ｍ
Paであることが分かる。従って、この銅管の場合は、３
００℃よりも若干低い温度に加熱することにより、銅管
の破裂を伴うことなく、その外径を最大限に拡張させる
ことが出来る。Equation 1 shows that when a gas of 5 MPa is enclosed in a metal tube at room temperature (20 ° C.) and heated to 300 ° C., the pressure P of the enclosed gas rises to 9.8 MPa.
However, as a practical matter, the pressure required for pipe expansion must be smaller than the burst pressure of the metal pipe.
Fig. 2 shows a copper tube with an outer diameter of 9.52 mm and a wall thickness of 0.34 mm, which is generally used as a heat transfer tube for an air conditioner, and is filled with 4.85 MPa of expanding gas at room temperature (20 ° C). The relationship between the change in the pressure of the enclosed gas and the increase in the outer diameter of the copper tube and the burst pressure when heated by heating is shown. As is clear from the figure, when the temperature of the copper tube is 300 ° C., the pressure of the enclosed gas and the burst pressure of the copper tube are almost the same, and the value is about 9.3M.
It turns out that it is Pa. Therefore, in the case of this copper tube, 3
By heating to a temperature slightly lower than 00 ° C., the outer diameter of the copper pipe can be expanded to the maximum without rupturing.
【００１２】一方、温度による封入気体の圧力変化は、
式１よりOn the other hand, the pressure change of the enclosed gas with temperature is
From Equation 1
【数２】ｄＰ／ｄＴ＝Ｐ0／Ｔ0 ・・・・・（２） の関係が成立するが、通常は（１／２９３）ＭPa／℃と
極めて小さいため、気体の加熱に伴う圧力を利用する本
発明の場合は、拡管の際に必要とする圧力制御が比較的
容易であり、工業生産的な取扱に適していることが分か
る。The relationship of dP / dT = P 0 / T 0 (2) is established, but it is usually (1/293) MPa / ° C, which is extremely small. In the case of the present invention to be used, it is understood that the pressure control required at the time of pipe expansion is relatively easy, and is suitable for industrial production handling.
【００１３】金属管に封入する気体は、安価で不活性で
ある例えば窒素ガスを使用することが望ましいが、金属
管の酸化が問題にならない場合は、空気を利用すること
も可能である。拡管終了後は、金属管及び放熱フィンの
全体を冷却し、空気中における金属管の酸化が問題にな
らない程度まで温度が下がった状態で流路の端末を開放
すると、封入気体が自力で噴出する。なお、拡管の際
は、放熱フィンと金属管との界面に低融点金属を介在さ
せておくことが望ましい。このようにすると、加熱拡管
工程における熱によって当該低融点金属が溶融して放熱
フィンと金属管との間を完全に密着する結果、両者の界
面における熱抵抗が大幅に低下させることが出来る。As the gas to be sealed in the metal tube, it is desirable to use, for example, nitrogen gas which is inexpensive and inert, but if the oxidation of the metal tube is not a problem, air can be used. After the expansion of the pipe, the entire metal pipe and radiating fins are cooled, and if the end of the flow path is opened while the temperature has dropped to a level where oxidation of the metal pipe in the air is not a problem, the enclosed gas spouts by itself. . When expanding the pipe, it is desirable to interpose a low melting point metal at the interface between the heat radiation fin and the metal pipe. In this case, the low melting point metal is melted by the heat in the heating and expanding process and the heat radiation fin and the metal pipe are completely adhered to each other, so that the thermal resistance at the interface between the two can be significantly reduced.
【００１４】[0014]
【実施例】以下、図１を参照して本発明方法の一実施例
を説明する。同図は、拡管作業中のクロスフィンチュー
ブ式熱交換器の部分断面を示したものである。アルミフ
ィン１には、プレス等の手段により、銅管２の外径より
も若干大きい内径の孔３を予め形成しておき、その孔に
銅管２を挿入する。銅管２の端末相互間は、Ｕベンド連
結管４を硬蝋付けすることによって連結し、全体として
一つの冷媒流路５を形成する。次に、冷媒流路５の一方
の端末部にキャップ７を、他方の端末部にフィルチュー
ブ８を被せて硬蝋付けした後、銅管２内に拡管用ガス
（窒素ガス等）を封入し、ピンチシールや硬蝋付け等の
手段を併用して固く密封する。なお、Ｕベンド連結管４
の代わりにヘアピンベンドを用いることも可能である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method of the present invention will be described below with reference to FIG. This figure shows a partial cross section of the cross fin tube type heat exchanger during the pipe expanding operation. A hole 3 having an inner diameter slightly larger than the outer diameter of the copper tube 2 is previously formed in the aluminum fin 1 by a means such as pressing, and the copper tube 2 is inserted into the hole. The ends of the copper pipes 2 are connected to each other by brazing the U-bend connecting pipe 4 to form one refrigerant flow path 5 as a whole. Next, a cap 7 is applied to one end of the refrigerant flow path 5, and a fill tube 8 is applied to the other end of the coolant flow path 5 for hard brazing. , Pinch seal, hard brazing, etc. are used together to tightly seal. The U-bend connecting pipe 4
It is also possible to use a hairpin bend instead of.
【００１５】このようにした構成した組立品をバッチ炉
又はトンネル式連続炉等の加熱炉９の内部に装填して保
護雰囲気中で所定温度まで加熱する。加熱の結果、銅管
３が封入気体の圧力によって膨張して塑性変形し、アル
ミフィン１の孔３の内面に固く食い込んで密着する。加
熱拡管作業終了後は、組立品の全体を冷却し、銅に変色
（酸化）を起こさせない程度の温度になったとき、フィ
ルチューブ８を破壊する等の手段によって流路端末部を
開放して封入ガス６を排出し、拡管作業を終了する。The assembly thus constructed is loaded into a heating furnace 9 such as a batch furnace or a tunnel type continuous furnace and heated to a predetermined temperature in a protective atmosphere. As a result of the heating, the copper tube 3 expands and is plastically deformed by the pressure of the enclosed gas, and bites firmly into the inner surface of the hole 3 of the aluminum fin 1 and adheres thereto. After the completion of the heating and expanding work, the entire assembly is cooled, and when the temperature reaches a level at which copper does not become discolored (oxidized), the flow tube terminal portion is opened by a means such as breaking the fill tube 8. The enclosed gas 6 is discharged, and the pipe expanding work is completed.
【００１６】アルミフィン１は、銅管２に比較して熱膨
張係数が大きいため、組立品の全体を常温まで冷却させ
た場合、銅管２よりも大きく収縮して当該銅管に強固に
密着する。なお、放熱フィンとして銅を使用した場合
は、その熱膨張係数は銅管２と同じであるが、拡管時の
残留歪が常温まで持ち越されるため、この場合も強固な
密着を得ることが出来る。また、銅製のフィンを使用す
る場合は、予めメッキ等の手段により、フィン１と銅管
２との界面のいずれか一方又は双方に半田などの低融点
金属を付着させておけば、加熱拡管工程における熱によ
って当該低融点金属が溶融し、放熱フィンと金属管との
間の密着度（金属接合の程度）を更に強化することが出
来る。Since the aluminum fin 1 has a larger coefficient of thermal expansion than the copper tube 2, when the entire assembly is cooled to room temperature, it contracts more than the copper tube 2 and firmly adheres to the copper tube. To do. When copper is used as the radiation fin, the coefficient of thermal expansion is the same as that of the copper tube 2, but the residual strain during tube expansion is carried over to room temperature, so that strong adhesion can be obtained in this case as well. When a copper fin is used, if a low melting point metal such as solder is attached to one or both of the interfaces between the fin 1 and the copper tube 2 in advance by a means such as plating, the heat expanding step The low melting point metal is melted by the heat in (1), and the degree of adhesion (degree of metal bonding) between the radiation fin and the metal tube can be further enhanced.
【００１７】[0017]
【発明の効果】本発明によれば、金属管の拡管工程を完
全に乾式化することが出来るため、好ましくない金属管
腐食を皆無とすることが可能となる。また、拡管の際の
気体圧力制御が比較的容易であるため、工業生産上の観
点から極めて好都合である。更に、本発明の製造方法
は、加熱炉とその付帯設備を追加するだけで、従来工程
を大幅に変更することなく熱交換器の量産ラインに適用
することが出来るほか、銅管の代わりにアルミ管を用い
た熱交換器にも適用することが可能である。According to the present invention, since the process of expanding the metal pipe can be completely dried, it is possible to eliminate undesirable metal pipe corrosion. Moreover, since gas pressure control during pipe expansion is relatively easy, it is extremely convenient from the viewpoint of industrial production. Furthermore, the manufacturing method of the present invention can be applied to a mass production line of heat exchangers without significantly changing the conventional process, only by adding a heating furnace and its auxiliary equipment, and in addition to copper pipes, aluminum can be used. It can also be applied to a heat exchanger using a tube.
【図１】本発明製造方法の一実施例を説明するための熱
交換器の部分断面図FIG. 1 is a partial cross-sectional view of a heat exchanger for explaining an embodiment of a manufacturing method of the present invention.
【図２】銅管の破裂圧力と封入気体の圧力との関係を示
す特性曲線図FIG. 2 is a characteristic curve diagram showing the relationship between the burst pressure of the copper tube and the pressure of the enclosed gas.
１…アルミフィン ２…銅管 ３…孔 ４…Ｕベンド連結管 ５…冷媒流路 ６…封入気体 ７…キャップ ８…フィルチューブ ９…加熱炉 DESCRIPTION OF SYMBOLS 1 ... Aluminum fin 2 ... Copper tube 3 ... Hole 4 ... U bend connection tube 5 ... Refrigerant flow path 6 ... Enclosed gas 7 ... Cap 8 ... Fill tube 9 ... Heating furnace
フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｂ２３Ｋ 101:14 Continuation of front page (51) Int.Cl. 5 Identification code Office reference number FI technical display area // B23K 101: 14
Claims (2)
の放熱フィンを相互に適当なギャップを設けて積層し、
当該フィンに所要本数の金属管を挿入する工程と、各金
属管を相互に接合して熱媒体用の流路を形成し、当該流
路内に拡管用気体を封入した後、流路の両端を密閉する
工程と、封入気体が所定の圧力となる温度まで金属管及
び放熱フィンの全体を加熱し、封入気体の圧力によって
金属管を拡管して放熱フィンに接合させる工程とからな
ることを特徴とするクロスフィンチューブ式熱交換器の
製造方法。1. A required number of radiating fins having holes for inserting metal pipes formed in advance, which are laminated with an appropriate gap provided therebetween.
Inserting the required number of metal pipes into the fins, and joining the metal pipes to each other to form a flow path for the heat medium. After enclosing the gas for expanding the pipe in the flow path, both ends of the flow path And a step of heating the entire metal pipe and the radiation fins to a temperature at which the enclosed gas reaches a predetermined pressure and expanding the metal pipe by the pressure of the enclosed gas to join the radiation fins. And a method for manufacturing a cross fin tube type heat exchanger.
を介在させておき、加熱拡管工程における熱を利用して
当該低融点金属を溶融させ、放熱フィンと金属管との密
着を改善することを特徴とする請求項１に記載の熱交換
器製造方法。2. A low melting point metal is interposed at the interface between the heat radiation fin and the metal tube, and the low melting point metal is melted by utilizing heat in the heating and expanding process to improve adhesion between the heat radiation fin and the metal tube. The heat exchanger manufacturing method according to claim 1, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4155273A JP2569452B2 (en) | 1992-06-15 | 1992-06-15 | Heat exchanger manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4155273A JP2569452B2 (en) | 1992-06-15 | 1992-06-15 | Heat exchanger manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH067873A true JPH067873A (en) | 1994-01-18 |
| JP2569452B2 JP2569452B2 (en) | 1997-01-08 |
Family
ID=15602301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4155273A Expired - Fee Related JP2569452B2 (en) | 1992-06-15 | 1992-06-15 | Heat exchanger manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2569452B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11254052A (en) * | 1997-12-23 | 1999-09-21 | Gkn Sankey Ltd | Hydro-forming method |
| CN102059296A (en) * | 2010-10-26 | 2011-05-18 | 华南理工大学 | Expanded joint method and device for high-pressure gas tube sheets |
| JP2011257084A (en) * | 2010-06-10 | 2011-12-22 | Sumitomo Light Metal Ind Ltd | All-aluminum heat exchanger |
| CN102363186A (en) * | 2011-09-29 | 2012-02-29 | Tcl空调器（武汉）有限公司 | Tube expansion device and method for heat exchanger |
| CN102921821A (en) * | 2012-10-31 | 2013-02-13 | 华南理工大学 | High-pressure liquid tube expanding device for fin arrangement |
| KR101531753B1 (en) * | 2013-06-28 | 2015-06-25 | 신영창 | Method for brazing pipes of evaporator using refregeneration |
| JP2016190263A (en) * | 2015-03-31 | 2016-11-10 | 住友重機械工業株式会社 | Molding device |
| JP2016190252A (en) * | 2015-03-31 | 2016-11-10 | 住友重機械工業株式会社 | Molding device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5574595B2 (en) * | 2008-10-02 | 2014-08-20 | 三菱アルミニウム株式会社 | Aluminum alloy extruded tube for fin tube type air conditioner heat exchanger |
| CN102527811A (en) * | 2012-02-08 | 2012-07-04 | 中山市微华机电科技有限公司 | Processing method of heat exchanger |
-
1992
- 1992-06-15 JP JP4155273A patent/JP2569452B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11254052A (en) * | 1997-12-23 | 1999-09-21 | Gkn Sankey Ltd | Hydro-forming method |
| JP2011257084A (en) * | 2010-06-10 | 2011-12-22 | Sumitomo Light Metal Ind Ltd | All-aluminum heat exchanger |
| CN102059296A (en) * | 2010-10-26 | 2011-05-18 | 华南理工大学 | Expanded joint method and device for high-pressure gas tube sheets |
| CN102363186A (en) * | 2011-09-29 | 2012-02-29 | Tcl空调器（武汉）有限公司 | Tube expansion device and method for heat exchanger |
| CN102921821A (en) * | 2012-10-31 | 2013-02-13 | 华南理工大学 | High-pressure liquid tube expanding device for fin arrangement |
| KR101531753B1 (en) * | 2013-06-28 | 2015-06-25 | 신영창 | Method for brazing pipes of evaporator using refregeneration |
| JP2016190263A (en) * | 2015-03-31 | 2016-11-10 | 住友重機械工業株式会社 | Molding device |
| JP2016190252A (en) * | 2015-03-31 | 2016-11-10 | 住友重機械工業株式会社 | Molding device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2569452B2 (en) | 1997-01-08 |
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| LAPS | Cancellation because of no payment of annual fees |