JPS61122496A - Method of repairing pipe - Google Patents

Abstract

PURPOSE:To positively achieve the sealing against fluid when there is a damage to a part of pipe which is inserted into and tightly contacting the inner surface of a hole in a pipe plate by removing a segment of the pipe which is located outside the damaged part and inserting a new pipe thereto and connecting the ends of the old and new pipes. CONSTITUTION:A heat transmission pipe 3 outside a damaged part 4 is removed, and then a new heat transmission pipe 6 is inserted thereto and the surrounding of the joint 8 of the heat transmission pipe 6 is brought to tightly contact a hole in a pipe plate 2. In this instance, when the new heat transmission pipe 6 is inserted, the end of the heat transmission pipe 6 is covered with a soft metal 9 such as gold. By making use of the elongation of the heat transmission pipe 6 in the axial direction when the new heat transmission pipe which has been inserted is expanded by a roller pipe expander 7, the new heat transmission pipe 6 is connected to the the old heat transmission pipe 3 by pressure welding through said metal 9. In this manner, owing to the soft metal 9 at the joint of the pipes 3 and 6, the heat transmission pipes 3, 6 are positively connected in a fluid-tight manner.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は熱交換器の伝熱管等の補修方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for repairing heat exchanger tubes, etc. of a heat exchanger.

一１Ｃ従来の技術） 一般に熱交換器は第７図に示すように、本体（１）の円
筒胴部両端の内面に管板（２）ｔ−流体密に固定し、両
管板（２）（２）に対向して穿設された複数の孔に伝熱
管（３）　ｔ　１人し、管板（２）の孔と伝熱管（３）
の両端の外周面とを拡管加工して構成し、一方の碗部→
伝熱管内→他方の碗部の経路で流通する管内流体と円筒
胴部の一部から流入し伝熱管（３）の外表面を流れて円
筒胴部の他部へ流出する管外流魁の間で伝熱管（３）ヲ
介して熱交換する。ところが、第８図に示すように、管
板（２）と伝熱管（３）との拡管加工された部分に損傷
（４）が生じ、伝熱管（３）内の管内流体が損傷（４）
を通過して伝熱管（３）外の管外流体側に洩れ出し、或
い拡、逆に管外流体が伝熱管（３）内の管内流体側へ洩
れ込んだ場合の対策として、第９図に示すように、盲＆
（５）ｔ−伝熱管（３）の両端部に施して両流体間の混
合を阻止する方法がある。1C Prior Art) Generally, a heat exchanger is fixed fluid-tightly to the inner surface of both ends of a cylindrical body of a main body (1), as shown in FIG. The heat exchanger tubes (3) are inserted into the multiple holes drilled opposite to the tube plate (2), and the holes in the tube sheet (2) and the heat exchanger tubes (3) are connected to each other.
It is constructed by expanding the outer peripheral surface of both ends of the bowl part→
Between the fluid inside the tube that flows through the path from inside the heat transfer tube to the other bowl section and the fluid outside the tube that flows in from a part of the cylindrical body, flows on the outer surface of the heat transfer tube (3), and flows out to the other part of the cylindrical body. Heat is exchanged through the heat transfer tube (3). However, as shown in Figure 8, damage (4) occurred in the expanded portion of the tube plate (2) and heat transfer tube (3), and the fluid inside the heat transfer tube (3) was damaged (4).
As a countermeasure in the event that the fluid outside the tube (3) leaks through the heat transfer tube (3) to the outside fluid side, or spreads, or conversely, the outside fluid leaks into the inside fluid side of the heat transfer tube (3), As shown in the figure, blind &
(5) There is a method of applying it to both ends of the T-heat exchanger tube (3) to prevent mixing between the two fluids.

（発明が解決しようとする問題点） 前記第９図に示す方法では、盲栓（５）ｔ−施した伝熱
管（３）に熱交換機能がなくなる。従って盲栓（５）　
？施した伝熱管（３）が増加する程、熱交換器の性能が
低下する。(Problems to be Solved by the Invention) In the method shown in FIG. 9, the heat exchanger tube (3) provided with the blind plug (5) loses its heat exchange function. Therefore blind stopper (5)
? As the number of applied heat transfer tubes (3) increases, the performance of the heat exchanger decreases.

（問題点を解決する丸めの手段） 本発明は前記の問題点に対処するもので、管板の孔に嵌
入されて同孔の内周面に密接した管部分に損傷が生じた
ときに、同損傷部よりも外側の管部分を抜き取シ、そこ
に新しい管を嵌入して、この新しい管の端部と旧管の端
部とを向かい合せ、次い゛で同端部間を流体密に接合す
ることを特徴とした管の補修方法に係わシ、その目的と
する処は、熱交換器の伝熱管等を簡易に確実に補修でき
る改良された管の補修方法を供する点にある。(Rounding Means to Solve the Problems) The present invention addresses the above-mentioned problems, and when damage occurs to the tube portion that is inserted into the hole in the tube sheet and is in close contact with the inner peripheral surface of the hole, The part of the pipe outside the damaged part is removed, a new pipe is inserted into it, the end of the new pipe faces the end of the old pipe, and then fluid is passed between the ends. Regarding the pipe repair method characterized by tight joints, the purpose is to provide an improved pipe repair method that can easily and reliably repair heat exchanger tubes, etc. of a heat exchanger. be.

（実施例） 次に本発明の管の補修方法を第１図乃至３１６１ｇに示
す実施例によ）説明すると、第４図に示すように、損傷
部（４）の外側の伝熱管（３）ｔ−取除き、次いで第２
図に示すように、新しい伝熱管（６）ｔ−嵌入し１、次
いで同伝熱管（６）の継目（８）の周辺を管板（２）の
孔に密接させるが、その際ローラ拡管機（７）によシ新
伝熱管（６）の継目（８）の周辺を拡管加工するのみで
は継目（８）の流体密を確保できないので、第３図に示
すように、新しい伝熱管（６）　ｔ−ＦＣ人する際、同
伝熱管へ（６）の先端に金などの軟かい金属（９）ヲか
ぶせ、嵌入した新しい伝熱管（６）ヲローラ拡管機（７
）で拡管加工する際の同伝熱管（６）の軸方向への伸び
金利用して新しい伝熱管（６）ｔ−上記金属（９）ｔ−
介して山伏熱管（３）に圧接する。軟かい金属（９）ヲ
挾む代シに、新しい伝熱管（６）の先端部を加熱軟化さ
せたのち、嵌入して、新しい伝熱管（６）の継目（８）
の周辺に拡管加工を施してもよい。また、第４図に示す
ように、両端に拡径部叫（ＬＤを有するスリーブ（１つ
會継目（８）ｔ−ま九いで嵌入し、拡径部（１１（１ｍ
）に拡管加工を施してもよい。(Example) Next, the method for repairing a tube according to the present invention will be explained using the example shown in FIGS. 1 to 3161g. As shown in FIG. t-removal, then second
As shown in the figure, a new heat exchanger tube (6) is inserted 1, and then the area around the joint (8) of the heat exchanger tube (6) is brought into close contact with the hole in the tube plate (2). (7) It is not possible to ensure fluid tightness at the joint (8) by simply expanding the area around the joint (8) of the new heat exchanger tube (6). ) When installing the t-FC, cover the tip of the heat exchanger tube (6) with a soft metal (9) such as gold, and insert the new heat exchanger tube (6) into the tube expander (7).
) When expanding the heat exchanger tube (6) in the axial direction, a new heat exchanger tube (6) t- is made from the above metal (9) t-
It is pressure-welded to the Yamabushi heat tube (3) through it. After heating and softening the tip of the new heat exchanger tube (6) in place of the soft metal (9), insert it into the joint (8) of the new heat exchanger tube (6).
The surrounding area may be expanded. In addition, as shown in Fig. 4, a sleeve (1) having an enlarged diameter section (LD) at both ends is inserted through the T-shaped joint (8), and the enlarged diameter section (11 (1 m)
) may be expanded.

第５図に示すように、スリーブ鰺の両波径部（１１％ａ
１）の外周面に円環状の突起（１３′ｔ−設けておき、
拡管部（１０ａ１の内面に拡管加工誉施してもよい。ま
た第６図に示すように、スリーブ（Ｌりの拡径部ＣＩＧ
（１１）が圧接される伝熱管（３）（６）の内面に円環
状の溝（１４）ｔ−設けておき、スリーブ醤の拡径部（
ｌＱａｍ）の内面に拡管加工を施してもよい。As shown in Figure 5, both wave diameter parts (11% a
1) An annular projection (13′t-) is provided on the outer peripheral surface of the
The inner surface of the expanded tube portion (10a1) may be expanded.Also, as shown in FIG.
An annular groove (14) is provided on the inner surface of the heat exchanger tubes (3) and (6) to which (11) is press-welded.
The inner surface of lQam) may be expanded.

前記拡管加工した管の補修方法の作用を説明する。第３
図に示す補修方法は、伝熱管（３）と（６）との間の軟
かい金属（９）が拡管圧力によプ伝熱管（３Ｈ６）の端
部によく作用して伝熱管（３）（６）が密着する。ま九
、新しい伝熱管（６）の先端部を加熱軟化させたのち拡
管加工する場合は、伝熱管（６）の先端部が軟かい金属
（９）と同様に作用する。ま九第４図に示す補修方法法
は、拡径部員住０の受圧面積が少く、拡管圧力が拡径部
α１ａ１）と伝熱管（３）（６）との間によく作用し、
互いが密着して、第３図の場合と同様に流体密が確保さ
れる。また、第５図及び第６図に示す補修方法は、拡径
部（１（１（１１）と伝熱管（３）（６）との間に拡管
圧力が更によく作用する。このように、本発明の管の補
修方法では、拡管圧力が接合部によく作用して、接合部
の流体密が確保される。The operation of the method for repairing the expanded pipe will be explained. Third
The repair method shown in the figure is that the soft metal (9) between the heat exchanger tubes (3) and (6) acts well on the end of the heat exchanger tube (3H6) due to tube expansion pressure. (6) is in close contact. (9) When expanding the tip of a new heat transfer tube (6) after softening it by heating, the tip of the heat transfer tube (6) acts in the same way as a soft metal (9). In the repair method shown in Fig. 4, the pressure-receiving area of the expanded diameter part member 0 is small, and the expansion pressure acts well between the expanded diameter part α1a1) and the heat exchanger tubes (3) and (6).
They come into close contact with each other, ensuring fluid tightness as in the case of FIG. In addition, in the repair method shown in FIGS. 5 and 6, the expansion pressure acts more effectively between the expanded diameter portion (1 (11) and the heat exchanger tubes (3) and (6). In this way, In the pipe repair method of the present invention, the pipe expansion pressure acts well on the joint, ensuring fluid tightness at the joint.

（発明の効果） 本発明の拡管加工した管の補修方法は前記のように、管
板の孔に嵌入されて同孔の内周面に密接した管部分に損
傷が生じたときに、同損傷部よ〕も外側の管部分を抜き
１ハそこに新しい管ｔ−ｉ大して、この新しい管の端部
と旧管の端部とを向かい合せ、次いで同端部間金流体密
に接合しているので、前記作用の項で述べたように、拡
管加工を受ける部分に拡管圧力がよく作用して、確実な
流体密性が確保される効果がある。(Effects of the Invention) As described above, the method for repairing expanded pipes of the present invention is effective when damage occurs to the part of the pipe that is inserted into the hole in the tube sheet and is in close contact with the inner peripheral surface of the hole. 1) Remove the outer tube section, place a new tube in it, place the end of this new tube and the end of the old tube opposite each other, and then join the ends together in a metal fluid-tight manner. Therefore, as described in the section of the above-mentioned operation, the tube expansion pressure acts well on the portion undergoing the tube expansion process, and there is an effect that reliable fluid tightness is ensured.

以上本発明を実施例について説明したが、勿論本発明は
このような実施例にだけ局限されるものではなく、本発
明の精神を逸脱しない範囲内で種々の設計の改変を施し
うるものである。Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明に係る拡管加工した管の補修方法の第１
工程を示す縦断面図、第２図は本発明に係る説明図、第
３図は本発明の第１案施例、第４熱交換器の概略縦断面
図、第８図は熱交換器の伝熱管の損傷部を示す縦断面図
、第９２図は熱交換器の不良伝熱管に盲栓を施す従来の
補修方法を示す縦断面図である。 （２）・・・管板、（３）（６）・・・伝熱管、（４）
・・・損傷部、（８）・・・継目、（９）・・・軟い金
属、　（ＩＩ（１１）・・・拡径部、（１３・・・スリ
ーブ、賎・・・突起、（１４）・・・溝。 復代理人弁理士岡本重文 外３名 第１図　　　　　　　　第２図 第３図　　　　　　　第４図 第５図　　　　　　　第７図Figure 1 shows the first method of repairing expanded pipes according to the present invention.
2 is an explanatory diagram of the present invention; FIG. 3 is a schematic vertical sectional view of the first embodiment of the present invention; and FIG. 8 is a schematic longitudinal sectional view of the fourth heat exchanger. FIG. 92 is a vertical cross-sectional view showing a damaged portion of a heat exchanger tube, and FIG. 92 is a vertical cross-sectional view showing a conventional repair method for plugging a defective heat exchanger tube in a heat exchanger. (2)...tube sheet, (3)(6)...heat exchanger tube, (4)
... Damaged part, (8) ... Seam, (9) ... Soft metal, (II (11) ... Expanded diameter part, (13 ... Sleeve, Seal ... Protrusion, ( 14)...Ditch. Sub-agent patent attorney Shigefumi Okamoto and three other people Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 7

Claims (1)

【特許請求の範囲】[Claims] 管板の孔に嵌入されて同孔の内周面に密接した管部分に
損傷が生じたときに、同損傷部よりも外側の管部分を抜
き取り、そこに新しい管を嵌入して、この新しい管の端
部と旧管の端部とを向かい合せ、次いで同端部間を流体
密に接合することを特徴とした管の補修方法。When damage occurs to a tube that has been inserted into a hole in a tube sheet and is in close contact with the inner circumferential surface of the hole, the portion of the tube that is outside the damaged area is pulled out, a new tube is inserted into it, and the new tube is replaced. A method for repairing a pipe, characterized by facing the end of the pipe and the end of the old pipe, and then joining the ends in a fluid-tight manner.