JPH0363000B2 - - Google Patents
Info
- Publication number
- JPH0363000B2 JPH0363000B2 JP63059592A JP5959288A JPH0363000B2 JP H0363000 B2 JPH0363000 B2 JP H0363000B2 JP 63059592 A JP63059592 A JP 63059592A JP 5959288 A JP5959288 A JP 5959288A JP H0363000 B2 JPH0363000 B2 JP H0363000B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- lead
- outer tube
- heat exchanger
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】
本発明は被鉛伝熱管の製造方法の改良に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for manufacturing lead-covered heat exchanger tubes.
従来、重油燃焼排ガスより排出される熱エネル
ギーを回収するための熱交換に使用される伝熱管
は、該ガス中に含まれる硫酸等のために短期間に
おいて腐食されるおそれがあるため銅管又は鋼管
等による内管の外側に鉛又は鉛合金を被鉛機にて
均一の厚さに押出被覆した外管とからなる２重管
が使用されている。然しながらこの場合第１図に
示す如く内管１、外管２との間に僅かな空気層３
が形成され易いため、外管２の表面に高温例えば
300℃程度の排ガスが流入するとこの空気層が熱
膨張によつて局部的膨出部４を形成するおそれが
ある。このように内管と外管との密着性が悪く、
空気層が形成されると熱抵抗が増大するばかりか
外管を著しく劣化させる。 Conventionally, heat transfer tubes used for heat exchange to recover the thermal energy emitted from heavy oil combustion exhaust gas have been made of copper tubes or A double pipe is used, which consists of an inner pipe made of steel pipe or the like, and an outer pipe coated with lead or a lead alloy to a uniform thickness by extrusion using a lead-covering machine. However, in this case, as shown in FIG. 1, there is a slight air layer 3 between the inner tube 1 and the outer tube 2.
is likely to be formed on the surface of the outer tube 2 at high temperatures, e.g.
When exhaust gas at about 300° C. flows in, this air layer may form a local bulge 4 due to thermal expansion. In this way, the adhesion between the inner tube and the outer tube is poor,
Formation of an air layer not only increases thermal resistance but also significantly deteriorates the outer tube.
即ち外管の表面温度は内管中に流れる流体（水
など）の温度によつて引つ張られるため、内管と
外管との密着性が局部的に悪いとこの部分が排ガ
スによつて局部的に高温（例えば150℃以上）に
なり著しく被鉛を劣化させる。 In other words, the surface temperature of the outer tube is stretched by the temperature of the fluid (water, etc.) flowing in the inner tube, so if the adhesion between the inner tube and the outer tube is locally poor, this area will be affected by the exhaust gas. Local high temperatures (e.g. over 150°C) will significantly deteriorate the lead coating.
又特開昭54−47157号公報に開示されているご
とく、内管の外表面に低融点金属のメツキを施
し、この外側に鉛合金管を被覆したのち、プラグ
により内管を拡管し、しかる後低融点金属の溶融
温度以上に加熱して内管と外管を金属接合する伝
熱管も提案されているが、両者の密着性、空気層
欠陥の完全除去は、なお不充分であつた。 Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 54-47157, the outer surface of the inner tube is plated with a low-melting point metal, the outer surface is coated with a lead alloy tube, and then the inner tube is expanded with a plug. Heat exchanger tubes have also been proposed in which the inner tube and the outer tube are metal-bonded by heating above the melting temperature of a low-melting point metal, but the adhesion between the two and the complete removal of air layer defects were still insufficient.
本発明は、かかる現状に鑑み鋭意研究を行なつ
た結果、内管と外管との密着性が良好で、空気層
を形成させない伝熱管の製造方法を開発したもの
である。即ち本発明に係る伝熱管の製造方法は、
銅管、鋼管による内管の表面に半田、錫、鉛等の
合金等の低融点金属の簿層を例えば溶融、又は電
気メツキ法より設け、この金属簿層を溶融状態に
しながら、溶融金属薄層上に鉛又は鉛合金管を被
覆することを特徴とするものである。 The present invention has been made as a result of intensive research in view of the current situation, and has developed a method for manufacturing a heat transfer tube that has good adhesion between the inner tube and the outer tube and does not form an air layer. That is, the method for manufacturing a heat exchanger tube according to the present invention is as follows:
A thin layer of a low-melting metal such as solder, tin, or an alloy of lead is provided on the surface of an inner pipe made of copper or steel pipe, for example, by melting or electroplating. It is characterized by coating lead or lead alloy pipes on the layer.
次に本発明の実施例の一例と作用を図面により
説明する。第２図に示す如く銅管１表面を酸洗又
は研磨した後、電気メツキ法により半田（Sn60
％−Pb40％合金、mp約180℃）の薄層５（厚さ
20μｍ）を設け、この半田層５を180〜230℃に加
熱して溶融状態にせしめ、この半田層の溶融状態
において280〜300℃の鉛合金（Pb−３％Sb合金）
管２を押出被覆して本発明法による伝熱管を得
た。 Next, an example and operation of an embodiment of the present invention will be explained with reference to the drawings. As shown in Figure 2, after pickling or polishing the surface of the copper tube 1, solder (Sn60
%-Pb40% alloy, mp approx. 180℃) thin layer 5 (thickness
This solder layer 5 is heated to 180 to 230°C to a molten state, and in the molten state of this solder layer, a lead alloy (Pb-3%Sb alloy) at 280 to 300°C is formed.
Tube 2 was extrusion coated to obtain a heat exchanger tube according to the method of the present invention.
この実施例において内管の銅管と外管の鉛合金
管とは溶融半田層を介してよく密着し、この両者
間に空気層など全く形成されなかつた。 In this example, the inner copper tube and the outer lead alloy tube were in close contact with each other through the molten solder layer, and no air layer was formed between them.
本発明によれば次の如き効果を有するものであ
る。 According to the present invention, the following effects are achieved.
(1) 内管と外管との密着性がよいため熱抵抗が少
なく熱伝達率がよい。(1) Good adhesion between the inner tube and outer tube, resulting in low thermal resistance and good heat transfer coefficient.
(2) 内管と外管との間に空気層がないため常に外
管の表面温度は内管内に流入する水の温度より
10℃程度高いだけであるため外管が局部的に劣
化することがない。(2) Since there is no air layer between the inner and outer tubes, the surface temperature of the outer tube is always lower than the temperature of the water flowing into the inner tube.
Since the temperature is only about 10°C higher, there is no local deterioration of the outer tube.
(3) 外管が局部的に膨出することなく、外管表面
に形成される硫酸鉛の皮膜が脱落することなく
長期に亘り使用することができる。(3) The outer tube can be used for a long period of time without locally bulging and without the lead sulfate film formed on the surface of the outer tube falling off.
第１図は従来の伝熱管の側断面図、第２図は本
発明法により製造された伝熱管の一例を示す断面
図である。
１……内管、２……被鉛外管、３……空気層、
４……膨出部、５……低溶融点金属薄層。
FIG. 1 is a side sectional view of a conventional heat exchanger tube, and FIG. 2 is a sectional view showing an example of a heat exchanger tube manufactured by the method of the present invention. 1...Inner pipe, 2...Leaded outer pipe, 3...Air layer,
4...Bulging portion, 5...Low melting point metal thin layer.
Claims (1)
簿層を設け、該金属簿層を加熱して溶融状態にし
ながら、溶融金属簿層上に鉛又は鉛合金管を被覆
することを特徴とする伝熱管の製造方法。1. A low melting point metal layer is provided on the surface of an inner pipe made of copper or steel pipe, and while the metal layer is heated to a molten state, lead or lead alloy pipe is coated on the molten metal layer. A method for manufacturing a heat exchanger tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5959288A JPS63243694A (en) | 1988-03-14 | 1988-03-14 | Heat transfer tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5959288A JPS63243694A (en) | 1988-03-14 | 1988-03-14 | Heat transfer tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63243694A JPS63243694A (en) | 1988-10-11 |
| JPH0363000B2 true JPH0363000B2 (en) | 1991-09-27 |
Family
ID=13117662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5959288A Granted JPS63243694A (en) | 1988-03-14 | 1988-03-14 | Heat transfer tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63243694A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5938513B2 (en) * | 1977-09-20 | 1984-09-17 | 古河電気工業株式会社 | Heat pipe with fins for waste heat recovery |
| NL7905101A (en) * | 1979-06-29 | 1980-12-31 | Neratoom | HEAT EXCHANGER AND PIPE FOR USE THEREIN. |
-
1988
- 1988-03-14 JP JP5959288A patent/JPS63243694A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63243694A (en) | 1988-10-11 |
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