JPH05126483A - Manufacture of heat exchanger - Google Patents
Manufacture of heat exchangerInfo
- Publication number
- JPH05126483A JPH05126483A JP3287642A JP28764291A JPH05126483A JP H05126483 A JPH05126483 A JP H05126483A JP 3287642 A JP3287642 A JP 3287642A JP 28764291 A JP28764291 A JP 28764291A JP H05126483 A JPH05126483 A JP H05126483A
- Authority
- JP
- Japan
- Prior art keywords
- copper tube
- brazing
- copper
- tube
- water
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000010949 copper Substances 0.000 claims abstract description 116
- 229910052802 copper Inorganic materials 0.000 claims abstract description 114
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 113
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910000679 solder Inorganic materials 0.000 claims abstract description 28
- 238000005219 brazing Methods 0.000 claims abstract description 23
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 19
- 230000003647 oxidation Effects 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 22
- 229910052799 carbon Inorganic materials 0.000 abstract description 22
- 238000007747 plating Methods 0.000 abstract description 11
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 238000005476 soldering Methods 0.000 abstract 4
- 238000005260 corrosion Methods 0.000 description 20
- 230000007797 corrosion Effects 0.000 description 20
- 239000010687 lubricating oil Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- PSFDQSOCUJVVGF-UHFFFAOYSA-N Harman Natural products C12=CC=CC=C2NC2=C1C=CN=C2C PSFDQSOCUJVVGF-UHFFFAOYSA-N 0.000 description 1
- 101100386054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CYS3 gene Proteins 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 101150035983 str1 gene Proteins 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Details Of Fluid Heaters (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、銅管を缶体にろう付け
して構成されるガス瞬間湯沸器などのような熱交換器の
製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a heat exchanger such as a gas instantaneous water heater constructed by brazing a copper tube to a can body.
【０００２】[0002]
【従来の技術】このような銅管を缶体にろう付けして構
成されるガス瞬間湯沸器では、常温付近の冷水による銅
管のピッチング腐食、すなわち孔食が問題となってい
る。この孔食のうち、タイプ１孔食は、銅管の引抜き製
造時に、潤滑油がその銅管の内面に残存することに起因
している。こうして引抜き加工された銅管を、酸洗を避
けるため非酸化性雰囲気中で焼なまししたとき、たとえ
ば約５００Å程度の薄い炭素皮膜が銅管の内面に形成さ
れる。このような焼なましをした銅管に、井戸水のよう
に抵抗率が低くかつ塩化物および酸素を含有する常温程
度の冷水を通したとき、銅管に孔食が生じ易く、その腐
食穴周辺に緑青色の腐食生成物が存在する。2. Description of the Related Art In a gas instantaneous water heater constructed by brazing such a copper tube to a can body, there is a problem of pitting corrosion, that is, pitting corrosion of the copper tube due to cold water near room temperature. Among the pitting corrosion, the type 1 pitting corrosion is caused by the fact that the lubricating oil remains on the inner surface of the copper pipe during the drawing production of the copper pipe. When the copper tube thus drawn is annealed in a non-oxidizing atmosphere in order to avoid pickling, a thin carbon film of, for example, about 500Å is formed on the inner surface of the copper tube. When cold water such as well water that has low resistivity and contains chloride and oxygen is passed through such annealed copper pipes, pitting corrosion easily occurs in the copper pipes, and the surroundings of the corrosion holes There is a green-blue corrosion product at.
【０００３】このようなタイプ１孔食を防ぐために従来
では、硬引き管、すなわち心金を用いた冷間引抜き加工
によって製造された銅管を用いている。このような硬引
き管は、曲げ加工が困難であり、したがってそのような
硬引き管を、缶体の外周部に巻付けて組立てることが困
難である。In order to prevent such type 1 pitting corrosion, conventionally, a hard drawn tube, that is, a copper tube manufactured by cold drawing using a mandrel is used. Such a hard-drawn tube is difficult to bend, and therefore it is difficult to assemble such a hard-drawn tube around the outer periphery of the can body.
【０００４】このような硬引き管を用いる代りに、焼な
ましをした軟質の銅管を使用することにならざるを得な
い。しかし非常に長いコイル状の銅管の内面を、焼なま
し中、炭素皮膜が形成されないように最善の状態に保つ
ことが困難であり、前述のタイプ１孔食を防ぐことがで
きなかった。Instead of using such a hard drawn tube, it is inevitable to use annealed soft copper tube. However, it is difficult to keep the inner surface of a very long coiled copper tube in the best condition so as not to form a carbon film during annealing, and it was impossible to prevent the above-mentioned type 1 pitting corrosion.
【０００５】このような銅管を缶体にコイル状に巻付け
て構成される従来からのガス瞬間湯沸器の製造工程を、
図６を参照して説明する。ステップａ１において、酸化
を防ぐためにＤＸガス雰囲気中で銅管にフィンなどを、
おおまかにろう付けし、次のステップａ２では、銅管を
缶体に細部にわたって配置してろう付けする。その後、
はんだ浴に浸漬してはんだメッキを施す。このとき銅管
内が酸化することを防ぐために、銅管内に窒素ガスを供
給する。本発明はこのような従来からの製造工程をほと
んど変えることなく、タイプ１孔食の発生を防止するこ
とが、後述のように可能である。The manufacturing process of a conventional gas instantaneous water heater, which is constructed by winding such a copper tube around a can body in a coil shape,
This will be described with reference to FIG. In step a1, in order to prevent oxidation, fins are added to the copper tube in a DX gas atmosphere,
Roughly brazing, and in the next step a2, a copper tube is placed on the can body in detail and brazed. afterwards,
Dip in a solder bath to apply solder plating. At this time, in order to prevent the inside of the copper tube from being oxidized, nitrogen gas is supplied into the copper tube. The present invention makes it possible to prevent the occurrence of type 1 pitting corrosion, as will be described later, with almost no change in the conventional manufacturing process.
【０００６】[0006]
【発明が解決しようとする課題】本発明の目的は、軟質
の銅管を用い、しかもタイプ１孔食の発生を防止するこ
とができるようにした熱交換器の製造方法を提供するこ
とである。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing a heat exchanger which uses a soft copper tube and is capable of preventing the occurrence of type 1 pitting corrosion. ..
【０００７】[0007]
【課題を解決するための手段】本発明は、銅管を缶体
に、加熱手段を用いてろう付けし、このろう付け時に、
常温付近の水または水溶液が流れる銅管の屈曲部付近全
体を、前記加熱手段で加熱し、その後、酸素を含むガス
を銅管内に圧送した状態で、はんだ浴に、前記銅管がろ
う付けされた缶体を浸漬し、そのはんだ浴から取出した
後に、銅管内に、流体を圧送して銅管内面の酸化生成物
を除去することを特徴とする熱交換器の製造方法であ
る。According to the present invention, a copper tube is brazed to a can body using a heating means, and at the time of brazing,
The entire vicinity of the bent portion of the copper tube in which water or an aqueous solution near room temperature flows is heated by the heating means, and then a gas containing oxygen is pressure-fed into the copper tube, and the copper tube is brazed to a solder bath. The heat exchanger is manufactured by immersing the formed can body, taking it out from the solder bath, and then pumping a fluid into the copper tube to remove an oxidation product on the inner surface of the copper tube.
【０００８】また本発明は、銅管を缶体に、加熱手段を
用いてろう付けし、このろう付け時に、常温付近の水ま
たは水溶液が流れる銅管の屈曲部付近全体を、前記加熱
手段で加熱し、その後、酸素を含むガスを銅管内に圧送
した状態で、前記銅管がろう付けされた缶体を加熱し、
その後に、銅管内に、流体を圧送して銅管内面の酸化生
成物を除去することを特徴とする熱交換器の製造方法で
ある。Further, according to the present invention, a copper pipe is brazed to a can body using a heating means, and at the time of brazing, the entire vicinity of a bent portion of the copper pipe through which water or an aqueous solution near room temperature flows is heated by the heating means. Heating, then, in a state in which a gas containing oxygen is pressure-fed into the copper pipe, the copper pipe is heated to the can body brazed,
After that, a fluid is pressure-fed into the copper tube to remove an oxidation product on the inner surface of the copper tube, which is a method for manufacturing a heat exchanger.
【０００９】[0009]
【作用】本発明に従えば、たとえば潤滑油を用いて引抜
き加工して製造し、焼なましをした銅管を缶体にろう付
けする。このろう付けの際に、加熱手段、たとえばガス
燃料を用いるバーナトーチおよび電気ヒータを有する加
熱こてなどを用いる。このろう付け時に、同時に、銅管
の常温付近の水または水溶液が流れる部分であって、か
つ銅管の屈曲部付近の全体を、加熱する。銅管の内部に
残存している潤滑油の大部分は、ろう付け時に、消失
し、または蒸発するけれども、特に前記屈曲部では、缶
の内面に発生することがある皺などに潤滑油またはそれ
が酸化して生じた炭素皮膜などが依然として残存してい
ることがあり、したがってこのような屈曲部付近全体
を、上述のように、ろう付けのために用いる加熱手段を
そのまま用いてさらに加熱し、こうして屈曲部付近で除
去しにくい銅管内面の炭素皮膜を可及的に消失除去す
る。加熱手段によって、屈曲部付近だけでなく、銅管全
体を加熱するようにしてもよい。According to the present invention, an annealed copper tube produced by drawing using a lubricating oil and then annealed is brazed to a can body. In this brazing, heating means such as a burner torch using gas fuel and a heating iron having an electric heater are used. At the time of this brazing, at the same time, the entire portion of the copper tube near the room temperature where water or an aqueous solution flows and near the bent portion of the copper tube is heated. Most of the lubricating oil remaining inside the copper pipe disappears or evaporates during brazing, but especially at the bent portion, the lubricating oil or wrinkles may be generated on the inner surface of the can. The carbon film or the like formed by the oxidation of may still remain, so that the entire vicinity of such a bent portion is further heated using the heating means used for brazing as described above, In this way, the carbon film on the inner surface of the copper pipe, which is difficult to remove near the bent portion, is eliminated and removed as much as possible. The heating means may heat not only the vicinity of the bent portion but also the entire copper tube.
【００１０】このようにして銅管がろう付けされた缶体
を、次に、はんだ浴に浸漬してはんだメッキする。この
とき、その銅管内に、酸素を含むガス、たとえば空気を
圧送し、こうして銅管の内面に付着残存している炭素皮
膜を完全に消失除去する。このようなはんだメッキの前
に、前述のように加熱手段で屈曲部付近全体を予め加熱
することによって、炭素皮膜の消失除去を確実に行うこ
とができる。The can body thus brazed with the copper tube is then immersed in a solder bath for solder plating. At this time, a gas containing oxygen, for example, air is pressure-fed into the copper tube to completely eliminate and remove the carbon film remaining on the inner surface of the copper tube. Before such solder plating, the carbon film can be surely removed and removed by previously heating the entire vicinity of the bent portion by the heating means as described above.
【００１１】はんだメッキ後では、銅管の内面には、白
色の酸化生成物、たとえばＣｕＯ、Ｃｕ2Ｏなどが生じ
ており、このような酸化生成物を除去し、さらにまた僅
かに残存しているかもしれない炭素を除去するために、
銅管内に流体を圧送し、たとえばウォータジェット、す
なわち高速度の水を、銅管内に噴射し、あるいはまたそ
のような液体または気体中に砥粒を混入してブラスト切
削加工し、こうして銅管内の酸化生成物を除去し、また
炭素の残存を確実に防ぐ。もしも、銅管内面に付着して
酸化生成物が残存すると、これによって銅の電位が上昇
し、タイプ１以外の孔食が生じ易くなるけれども、本発
明はこの問題を解決する。After the solder plating, white oxidation products, such as CuO and Cu 2 O, are formed on the inner surface of the copper tube. Such oxidation products are removed, and a small amount remains. To remove any carbon that may be
A fluid is pumped into a copper tube, for example, a water jet, that is, high-speed water is jetted into the copper tube, or abrasive particles are mixed in such a liquid or gas for blast cutting, and thus copper is used. It removes oxidation products in the tube and ensures that carbon remains. If the oxidation products remain on the inner surface of the copper tube and remain there, the potential of copper rises and pitting corrosion other than type 1 tends to occur, but the present invention solves this problem.
【００１２】さらに本発明に従えば、はんだメッキをし
ないときには、前記屈曲部付近全体を前記加熱手段で加
熱した後、その缶体にろう付けされた銅管の前記屈曲部
付近全体をさらに加熱して、銅管内面の炭素を確実に除
去するようにしてもよい。Further, according to the present invention, when the solder plating is not performed, the entire area near the bent portion is heated by the heating means, and then the entire area near the bent portion of the copper tube brazed to the can is further heated. Thus, the carbon on the inner surface of the copper pipe may be surely removed.
【００１３】[0013]
【実施例】図１は、本発明の一実施例の工程を示す図で
ある。ステップｂ１では、図２に示される缶体１の外周
面に、銅管２の大まかなろう付け作業が行われ、ガス瞬
間湯沸器の熱交換器３が構成される。このときには、缶
体１と銅管２の酸化を防止するために、ＤＸガス雰囲気
の炉内で行われる。銅管２は、潤滑油を用いて引抜き造
管され、その後、焼なましをして軟質とされる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a process of an embodiment of the present invention. In step b1, a rough brazing work of the copper pipe 2 is performed on the outer peripheral surface of the can body 1 shown in FIG. 2 to form the heat exchanger 3 of the gas instantaneous water heater. At this time, in order to prevent the can body 1 and the copper tube 2 from being oxidized, it is performed in a furnace in a DX gas atmosphere. The copper tube 2 is drawn by using a lubricating oil, and then annealed to be soft.
【００１４】ステップｂ２では、缶体１への銅管２の細
部のろう付け、組立てが行われる。この缶体１への銅管
２のろう付けされた状態は、図３に示されるとおりであ
る。参照符４は、ろう材である。このろう付け時には、
たとえばアセチレンなどのガス燃料を燃焼するバーナト
ーチ５が用いられ、このバーナトーチ５の炎６の温度
は、約１２００℃であり、ろう付けを行うと同時に、銅
管２の常温付近の水が流れる屈曲部２ａ，２ｂ付近全体
を加熱する。このろう付けおよび屈曲部２ａ，２ｂ付近
の加熱時の銅管２の温度は、たとえば約６００〜８００
℃である。In step b2, details of the copper tube 2 are brazed and assembled to the can body 1. The brazing state of the copper tube 2 to the can body 1 is as shown in FIG. Reference numeral 4 is a brazing material. During this brazing,
For example, a burner torch 5 that burns a gas fuel such as acetylene is used, and the temperature of the flame 6 of this burner torch 5 is about 1200 ° C., and at the same time as brazing, the bent portion of the copper tube 2 in which water near normal temperature flows The entire area around 2a and 2b is heated. The temperature of the copper tube 2 during brazing and heating near the bent portions 2a and 2b is, for example, about 600 to 800.
℃.
【００１５】銅管２の内面には、引抜き造管時に用いら
れる潤滑剤が、焼なまし中に分解し、その銅管２の内面
には炭素皮膜が付着している。ステップｂ２では、バー
ナトーチ５を用いるろう付け時に、特に銅管２の屈曲部
２ａ，２ｂ付近全体を加熱し、これによって銅管２の屈
曲部２ａ，２ｂ付近に付着している炭素皮膜を酸化して
除去する。銅管２の入口端部２ｃと温水が排出される出
口端部２ｄとは、缶体１の下方に突出して延びる。銅管
２の屈曲部２ａ，２ｂだけでなく、常温付近の水が流れ
る入口端部２ｃおよび直管上の部分２ｅ，２ｆなどもま
た、バーナトーチ５の炎６によって加熱し、それらの直
管部２ｅ，２ｆ内の炭素皮膜を加熱して酸化するように
してもよい。本発明では、銅管２の少なくとも屈曲部２
ａ，２ｂ付近全体を上述のように加熱し、次のステップ
ｂ３およびｂ４での残存炭素皮膜の除去を確実にする。On the inner surface of the copper tube 2, the lubricant used in the drawing process is decomposed during the annealing, and a carbon film is attached to the inner surface of the copper tube 2. In step b2, when brazing using the burner torch 5, the entire area near the bent portions 2a, 2b of the copper tube 2 is heated, thereby oxidizing the carbon film adhering near the bent portions 2a, 2b of the copper tube 2. To remove. An inlet end 2c of the copper tube 2 and an outlet end 2d from which hot water is discharged extend so as to project below the can body 1. Not only the bent portions 2a and 2b of the copper tube 2, but also the inlet end 2c through which water near normal temperature and the portions 2e and 2f on the straight pipe are heated by the flame 6 of the burner torch 5, and the straight pipe portion thereof is heated. The carbon coatings in 2e and 2f may be heated and oxidized. In the present invention, at least the bent portion 2 of the copper tube 2
The entire area around a and 2b is heated as described above to ensure removal of the residual carbon coating in the next steps b3 and b4.
【００１６】ステップｂ３では、図４に示されるよう
に、浴槽７の溶融はんだ浴８内に、前記銅管２がろう付
けされた缶体１を浸漬する。このとき、銅管２の入口端
部２ｃと出口端部２ｄははんだ浴８の上面９よりも上方
にあり、入口端部２ｃには管路１０を介して圧縮機１１
から圧縮空気を圧送する。入口端部２ｃと管路１０と
は、着脱可能な管継手１２によって接続される。こうし
て、銅管２内に圧縮空気が供給された状態で、缶体１は
はんだ浴８に浸漬される。この浸漬している時間は、た
とえば１０秒間であってもよい。はんだ浴８は、たとえ
ば４５０℃である。圧縮空気に代えて、Ｏ2を含むその
他のガスであってもよい。こうして、銅管２がろう付け
された缶体１がはんだ浴８に浸漬されることによって、
それらの外周面がはんだメッキされ、これと同時に銅管
２の内面に付着して残存している炭素皮膜は、はんだ浴
８の高温度の熱によって、圧縮空気中に含まれる酸素に
よる酸化が促進され、次の化１の反応によって炭酸ガス
として除去される。In step b3, as shown in FIG. 4, the can body 1 brazed with the copper tube 2 is immersed in the molten solder bath 8 of the bath 7. At this time, the inlet end portion 2c and the outlet end portion 2d of the copper tube 2 are located above the upper surface 9 of the solder bath 8, and the inlet end portion 2c is connected to the compressor 11 via the pipe line 10.
To send compressed air from. The inlet end 2c and the conduit 10 are connected by a removable pipe joint 12. In this way, the can body 1 is dipped in the solder bath 8 while the compressed air is supplied into the copper tube 2. The immersion time may be, for example, 10 seconds. The solder bath 8 is at 450 ° C., for example. Instead of compressed air, other gas containing O 2 may be used. Thus, by immersing the can body 1 to which the copper tube 2 is brazed in the solder bath 8,
The outer peripheral surface of the carbon film is solder-plated, and at the same time, the carbon film attached and remaining on the inner surface of the copper tube 2 is accelerated by the high-temperature heat of the solder bath 8 to promote oxidation by oxygen contained in the compressed air. And is removed as carbon dioxide gas by the following reaction of Chemical formula 1.
【００１７】[0017]
【化１】Ｃ ＋ Ｏ2 → Ｃ０2 ↑ ステップｂ３では、銅管２内において炭素皮膜だけでな
く、銅管２の内面の酸化が生じ、白色の酸化生成物Ｃｕ
Ｏ、Ｃｕ2Ｏなどが生成する。これらの酸化生成物は、
Ｃｕの電位を上げ、他のタイプの孔食が生じて銅管２の
耐食性に悪影響を及ぼす恐れがある。そこで、銅管２内
の酸化生成物による銅管２の耐食性が低下することを防
ぐために、次のステップｂ４では、ウォータジェットに
よる銅管２内のクリーニングを行う。図５に示されるよ
うに、前述のはんだ浴８から缶体１を取出して、図５に
示されるように、入口端部２ｃに着脱可能な管継手１３
を介して管路１４からポンプ１５によって水を圧送す
る。この水の流速は、たとえば１０ｍ／秒である。水内
に砥粒が混入されていてもよい。こうして高速度の水、
すなわちウォータジェットを銅管２内に供給して圧送す
ることによって、銅管２内面の酸化生成物を除去するこ
とができる。水の代りに他の流体が用いられてもよい。## STR1 ## In C + O 2 → C0 2 ↑ step b3, not only carbon film in the copper tube 2, resulting oxidation of the inner surface of the copper tube 2, white oxidation product of Cu
O, Cu 2 O, etc. are generated. These oxidation products are
There is a possibility that the electric potential of Cu may be raised and other types of pitting corrosion may occur to adversely affect the corrosion resistance of the copper tube 2. Therefore, in order to prevent the corrosion resistance of the copper pipe 2 from being deteriorated by the oxidation product in the copper pipe 2, in the next step b4, the inside of the copper pipe 2 is cleaned by water jet. As shown in FIG. 5, the can body 1 is taken out from the above-mentioned solder bath 8 and, as shown in FIG.
Water is pumped from the conduit 14 via the pump 15 via. The flow velocity of this water is, for example, 10 m / sec. Abrasive grains may be mixed in the water. Thus high speed water,
That is, by supplying the water jet into the copper tube 2 and feeding it under pressure, the oxidation product on the inner surface of the copper tube 2 can be removed. Other fluids may be used instead of water.
【００１８】本発明の他の実施例として、前述のステッ
プｂ３によってはんだメッキを行うことなく、銅管２の
前記屈曲部２ａ，２ｂの全体にわたり、バーナトーチ５
などの加熱手段を用いて、加熱し、炭素皮膜を酸化する
ようにしてもよい。その後のステップｂ４は、同様に行
われる。As another embodiment of the present invention, the burner torch 5 is provided over the entire bent portions 2a, 2b of the copper tube 2 without performing the solder plating in the step b3.
A heating means such as the above may be used to heat and oxidize the carbon film. The subsequent step b4 is similarly performed.
【００１９】本件発明者の実験結果を述べる。図１〜図
５に示される実施例によって製造した熱交換器を有する
瞬間湯沸器を、一般家庭で設置して使用したところ、４
年間経過しても、タイプ１腐食による銅管２の腐食漏れ
は全く生じないことが確認された。これに対して、前述
の図６に示される先行技術によって製造した瞬間湯沸器
を一般家庭で使用したところ、１年半でタイプ１腐食が
生じて銅管の水漏れが生じた。これらの各実験では、地
下水が用いられた。The experimental results of the present inventor will be described. When the instantaneous water heater having the heat exchanger manufactured according to the embodiment shown in FIGS.
It was confirmed that no corrosion leakage of the copper pipe 2 due to type 1 corrosion occurred even after a year. On the other hand, when the instant water heater manufactured by the prior art shown in FIG. 6 was used in a general household, Type 1 corrosion occurred in one and a half years and water leakage of the copper pipe occurred. Groundwater was used in each of these experiments.
【００２０】[0020]
【発明の効果】以上のように本発明によれば、銅管を缶
体に、ガス燃料などを用いるバーナトーチを用い、また
は電気ヒータを有する加熱こてなどの加熱手段を用いて
ろう付けし、このろう付け時に、常温付近の水または水
溶液のような液体が流れる銅管の屈曲部付近全体を、前
記加熱手段で加熱し、その後、はんだ浴中に浸漬しては
んだメッキし、このとき銅管内にはＯ2 を含むガス、た
とえば空気を圧送し、そのはんだ浴から取出した後に、
銅管内に、流体を圧送して銅管内の酸化生成物を除去す
るようにしたので、銅管の引抜き造管時に用いられる潤
滑剤が焼なまし中に分解して、銅管の内壁に付着してい
る炭素皮膜は、前記屈曲部付近全体が加熱手段で上述の
ように加熱されることによって、酸化され、さらにはん
だメッキ時に酸素を含むガスが銅管内に圧送されること
によって、炭素皮膜が酸化され、こうして炭素皮膜を除
去することができ、銅管のタイプ１孔食を防ぐことがで
きる。しかもこのような工程は、従来からの熱交換器の
製造時の工程を大きく変化するものではなく、生産性の
低下が抑制され、本発明の実施は極めて容易である。As described above, according to the present invention, a copper tube is brazed to a can body using a burner torch using gas fuel or the like, or using a heating means such as a heating iron having an electric heater, At the time of this brazing, the entire vicinity of the bent portion of the copper tube through which a liquid such as water or an aqueous solution near normal temperature flows is heated by the heating means, and then immersed in a solder bath for solder plating. A gas containing O 2 , such as air, is pumped in and taken out from the solder bath,
Since the fluid is pumped into the copper pipe to remove the oxidation products in the copper pipe, the lubricant used during the drawing process of the copper pipe decomposes during annealing and the inner wall of the copper pipe The carbon film adhering to is oxidized by being heated in the entire vicinity of the bent portion by the heating means as described above, and a gas containing oxygen is further pressure-fed into the copper pipe during solder plating, The carbon coating is oxidized and thus the carbon coating can be removed to prevent type 1 pitting corrosion of copper tubes. Moreover, such a process does not significantly change the conventional process of manufacturing the heat exchanger, the decrease in productivity is suppressed, and the present invention is extremely easy to implement.
【００２１】さらに本発明によれば、はんだメッキ後に
は、銅管内に、流体を圧送して銅管内面の酸化生成物を
除去するようにしたので、他のタイプの孔食が生じるこ
とはない。Further, according to the present invention, after the solder plating, the fluid is pumped into the copper tube to remove the oxidation products on the inner surface of the copper tube, so that other types of pitting corrosion do not occur. Absent.
【図１】本発明の一実施例の瞬間湯沸器の製造工程を示
す図である。FIG. 1 is a diagram showing a manufacturing process of an instant water heater according to an embodiment of the present invention.
【図２】瞬間湯沸器の熱交換器３の簡略化した斜視図で
ある。FIG. 2 is a simplified perspective view of a heat exchanger 3 of an instantaneous water heater.
【図３】銅管２と缶体１との一部とを示す断面図であ
る。FIG. 3 is a cross-sectional view showing a copper tube 2 and a part of a can body 1.
【図４】銅管２がろう付けされた缶体１をはんだ浴８に
浸漬して空気を銅管２内に圧送した状態を示す断面図で
ある。FIG. 4 is a cross-sectional view showing a state where the can body 1 to which the copper tube 2 is brazed is dipped in a solder bath 8 and air is pressure-fed into the copper tube 2.
【図５】はんだメッキ後に銅管２内に水を圧送してクリ
ーニングする状態を示す図である。FIG. 5 is a diagram showing a state in which water is pressure-fed into the copper tube 2 for cleaning after solder plating.
【図６】先行技術の製造工程を示す図である。FIG. 6 is a diagram showing a manufacturing process of a prior art.
１ 缶体 ２ 銅管 ２ａ，２ｂ 屈曲部 ２ｃ 入口端部 ２ｄ 出口端部 ４ ろう ５ バーナトーチ ６ 炎 ８ はんだ浴 １１ 圧縮機 １５ ポンプ 1 can body 2 copper pipes 2a, 2b bent portion 2c inlet end portion 2d outlet end portion 4 braze 5 burner torch 6 flame 8 solder bath 11 compressor 15 pump
フロントページの続き (72)発明者 今田 勝 大阪市港区南市岡１丁目１番52号 株式会 社ハーマン内 (72)発明者 好川 保 大阪市港区南市岡１丁目１番52号 株式会 社ハーマン内Front page continuation (72) Inventor Masaru Imada 1-52, Minami-shi Oka, Minato-ku, Osaka 1-52, Harman Co., Ltd. Within
Claims (2)
けし、 このろう付け時に、常温付近の水または水溶液が流れる
銅管の屈曲部付近全体を、前記加熱手段で加熱し、 その後、酸素を含むガスを銅管内に圧送した状態で、は
んだ浴に、前記銅管がろう付けされた缶体を浸漬し、 そのはんだ浴から取出した後に、銅管内に、流体を圧送
して銅管内面の酸化生成物を除去することを特徴とする
熱交換器の製造方法。1. A copper tube is brazed to a can using a heating means, and at the time of brazing, the entire vicinity of a bent portion of the copper tube through which water or an aqueous solution near room temperature flows is heated by the heating means. Then, while the gas containing oxygen was pumped into the copper tube, the can body to which the copper tube was brazed was dipped in a solder bath, and after removing it from the solder bath, the fluid was pumped into the copper tube. A method for manufacturing a heat exchanger, characterized in that the oxidation product on the inner surface of the copper pipe is removed by performing the above process.
けし、 このろう付け時に、常温付近の水または水溶液が流れる
銅管の屈曲部付近全体を、前記加熱手段で加熱し、 その後、酸素を含むガスを銅管内に圧送した状態で、前
記銅管がろう付けされた缶体を加熱し、 その後に、銅管内に、流体を圧送して銅管内面の酸化生
成物を除去することを特徴とする熱交換器の製造方法。2. A copper tube is brazed to a can using a heating means, and at the time of this brazing, the entire vicinity of a bent portion of the copper tube through which water or an aqueous solution near room temperature flows is heated by the heating means. Then, in a state in which a gas containing oxygen is pressure-fed into the copper tube, the copper tube is brazed to heat the can body, and thereafter, in the copper tube, a fluid is pressure-fed to oxidize the inner surface of the copper tube. A method for manufacturing a heat exchanger, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3287642A JP2929334B2 (en) | 1991-11-01 | 1991-11-01 | Heat exchanger manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3287642A JP2929334B2 (en) | 1991-11-01 | 1991-11-01 | Heat exchanger manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05126483A true JPH05126483A (en) | 1993-05-21 |
| JP2929334B2 JP2929334B2 (en) | 1999-08-03 |
Family
ID=17719871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3287642A Expired - Fee Related JP2929334B2 (en) | 1991-11-01 | 1991-11-01 | Heat exchanger manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2929334B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322575A (en) * | 2021-12-22 | 2022-04-12 | 芜湖福记恒机械有限公司 | Complex copper water jacket based on 3D printing technology and casting molding process thereof |
-
1991
- 1991-11-01 JP JP3287642A patent/JP2929334B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322575A (en) * | 2021-12-22 | 2022-04-12 | 芜湖福记恒机械有限公司 | Complex copper water jacket based on 3D printing technology and casting molding process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2929334B2 (en) | 1999-08-03 |
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