JPH02183795A - Welding method for double-walled thermal transmitting pipe and heat exchanger - Google Patents
Welding method for double-walled thermal transmitting pipe and heat exchangerInfo
- Publication number
- JPH02183795A JPH02183795A JP206789A JP206789A JPH02183795A JP H02183795 A JPH02183795 A JP H02183795A JP 206789 A JP206789 A JP 206789A JP 206789 A JP206789 A JP 206789A JP H02183795 A JPH02183795 A JP H02183795A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- heat exchanger
- double
- annular
- 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
- 238000003466 welding Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title abstract description 9
- 239000011261 inert gas Substances 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 25
- 238000012546 transfer Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 5
- 230000035515 penetration Effects 0.000 abstract description 2
- 239000011324 bead Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 11
- 229910052708 sodium Inorganic materials 0.000 description 11
- 239000011734 sodium Substances 0.000 description 11
- 239000001307 helium Substances 0.000 description 9
- 229910052734 helium Inorganic materials 0.000 description 9
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 9
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- -1 steam Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/003—Multiple wall conduits, e.g. for leak detection
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は高速増殖炉（Ｆａｓｔ Ｂｒｅｄｅｒ Ｒｅａ
ｃｔｏｒ以下単にＦＢＲという）の過熱器、・蒸気発生
器などの熱交換器に用いられる二重壁伝熱管に係り、特
に二重壁伝熱管と二重壁伝熱管の欠陥を検出する検出機
構を備えた熱交換器に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fast breeder reactor (Fast Breder Reactor).
ctor (hereinafter simply referred to as FBR), double-walled heat exchanger tubes used in heat exchangers such as steam generators, and in particular, a detection mechanism for detecting defects in double-walled heat exchanger tubes and double-walled heat exchanger tubes. The present invention relates to a heat exchanger equipped with a heat exchanger.
例えばＦＢＲ用の過熱器、蒸気発生器などの熱交換器に
は外管と内管によって形成された二重壁伝熱管が用いら
れ、この二重壁伝熱管の外側には加熱流体であるナトリ
ウムを、内側には被加熱流体である水をそれぞれ供給し
て外管の周囲を流れるナトリウムの熱を水で回収するこ
とが行なわれている。For example, a double-walled heat exchanger tube formed by an outer tube and an inner tube is used for heat exchangers such as FBR superheaters and steam generators, and the outside of this double-walled heat exchanger tube is filled with sodium chloride, which is a heating fluid. Water, which is a fluid to be heated, is supplied to the inside of the tube, and the heat of the sodium flowing around the outer tube is recovered using the water.
そして、二重壁伝熱管の外管と内管との境界にはヘリウ
ム、アルゴンなどの不活性ガスを供給して二重壁伝熱管
の欠陥、漏れを常に検出している。An inert gas such as helium or argon is supplied to the boundary between the outer tube and the inner tube of the double-walled heat exchanger tube to constantly detect defects and leaks in the double-walled heat exchanger tube.
それはナトリウム中へ水、蒸気が漏れた場合、ナトリウ
ムと水、蒸気との化学反応を防止するために二重壁伝熱
管の漏れを初期の段階で検出し、ナトリウム、あるいは
水の供給を停止したり、原子炉を停止するなどの適切な
処置を施す必要があるからである。If water or steam leaks into the sodium, it detects the leak in the double-walled heat exchanger tube at an early stage and stops the sodium or water supply to prevent chemical reactions between sodium and water or steam. This is because it is necessary to take appropriate measures such as shutting down the reactor or shutting down the reactor.
第６図は熱交換器の縦断面図、第７図は二重壁伝熱管の
拡大縦断面図、第８図は第７図の■−■線横線面断面図
９図は外管の内面展開図である。Figure 6 is a vertical cross-sectional view of the heat exchanger, Figure 7 is an enlarged vertical cross-sectional view of a double-walled heat transfer tube, Figure 8 is a cross-sectional view taken along the line ■-■ in Figure 7, and Figure 9 is the inner surface of the outer tube. This is a developed diagram.
第６図から第９図において、熱交換器ｌ内には蒸気出口
側管板２、上管板３、下管板４および水入口側管板５に
よって蒸気ブレナム６、ヘリウムブレナム７．８および
水ブレナム９に仕切られ、蒸気出口側管板２と水入口側
管板５の間には内管１０が配置されて蒸気ブレナム６と
水プレナム９はこの内管１０によって接続されている。6 to 9, inside the heat exchanger l, a steam outlet tube plate 2, an upper tube plate 3, a lower tube plate 4, and a water inlet tube plate 5 are arranged to form a steam blenum 6, a helium blenum 7.8, and The water plenum 9 is partitioned, and an inner pipe 10 is disposed between the steam outlet side tube plate 2 and the water inlet side tube plate 5, and the steam plenum 6 and the water plenum 9 are connected by this inner tube 10.
一方、上管板３と下管板４の間には外管１１が配置され
てヘリウムブレナム７．８がこの外管１１によって接続
されている。On the other hand, an outer tube 11 is arranged between the upper tube plate 3 and the lower tube plate 4, and the helium blemish 7.8 is connected by this outer tube 11.
従って、ヘリウムブレナム７．８は内管ｌＯと外管１１
によって形成された二重壁伝熱管１２によって接続され
、水ブレナム９と蒸気プレナム６は二重壁伝熱管１２の
内管１０によってのみ接続されている。Therefore, the helium blenheim 7.8 has an inner tube lO and an outer tube 11
The water plenum 9 and the steam plenum 6 are connected only by the inner tube 10 of the double-walled heat exchanger tube 12 .
１３はナトリウム入口ノズル、１４はナトリウム出口ノ
ズル、１５は水入口ノズル、１６は蒸気出口ノズル、１
７は内管１０と外管１１の境界に形成されたリーク検出
用溝、１８はリーク検出器である。13 is a sodium inlet nozzle, 14 is a sodium outlet nozzle, 15 is a water inlet nozzle, 16 is a steam outlet nozzle, 1
7 is a leak detection groove formed at the boundary between the inner tube 10 and the outer tube 11, and 18 is a leak detector.
この様な構造において、熱交換器１内には第７図および
第８図に示す様に多数の二重壁伝熱管１２が配置され、
高温のナトリウムはナトリウム入口ノズル１３から供給
され熱交換器ｌと二重壁伝熱管１２の間を下降して二重
壁伝熱管１２の内管１０内を流れる水と熱交換し、低温
になったナトリウムはナトリウム出口ノズル１４より排
出される。In such a structure, a large number of double-walled heat exchanger tubes 12 are arranged in the heat exchanger 1 as shown in FIGS. 7 and 8,
High-temperature sodium is supplied from the sodium inlet nozzle 13, descends between the heat exchanger 1 and the double-walled heat exchanger tube 12, exchanges heat with the water flowing in the inner tube 10 of the double-walled heat exchanger tube 12, and becomes low temperature. The sodium is discharged from the sodium outlet nozzle 14.
一方、水は水入口ノズル１５より水プレナム９に入り水
入口側管板５より二重壁伝熱管１２の内管１０内へ分流
される。この二重壁伝熱管１２で加熱された蒸気は蒸気
ブレナム６に集められ、蒸気出口ノズル１６より排出さ
れる。On the other hand, water enters the water plenum 9 through the water inlet nozzle 15 and is diverted from the water inlet side tube plate 5 into the inner tube 10 of the double-walled heat exchanger tube 12. The steam heated by the double-walled heat exchanger tube 12 is collected in the steam brenum 6 and discharged from the steam outlet nozzle 16.
他方、不活性ガスはヘリウムブレナム７から二重壁伝熱
管１２の境界に形成されたリーク検出用溝１７を経て、
ヘリウムブレナム８へ供給され、内管１０、外管１１か
ら万−水、蒸気、ナトリウムのリークが発生した場合、
ヘリウムブレナム７内での不活性ガスの湿分、圧力の変
化などによってリーク検出器１８により、内管１０、外
管１１からの漏洩が検出される。On the other hand, the inert gas passes from the helium blemish 7 through the leak detection groove 17 formed at the boundary of the double-walled heat exchanger tube 12.
If water, steam, or sodium leaks from the inner tube 10 and outer tube 11 while being supplied to the helium brenum 8,
Leakage from the inner tube 10 and outer tube 11 is detected by the leak detector 18 based on changes in the moisture and pressure of the inert gas within the helium blemish 7.
ところが、二重壁伝熱管１２の外管１１の内周面と内管
１０の外周面は機械的に密着されており、この境界での
熱抵抗は極力低く抑える構造になっているが、わずかな
ギャップは残っている。However, the inner circumferential surface of the outer tube 11 and the outer circumferential surface of the inner tube 10 of the double-walled heat transfer tube 12 are mechanically bonded to each other, and although the structure is such that the thermal resistance at this boundary is kept as low as possible, A gap remains.
従って二重壁伝熱管１２で第９図に示す如くリーク個所
１９が発生した場合、内管１０と外管１１のギャップは
極めて小さいために流動抵抗が大きく、このために第９
図の矢印で示す如く、リーク流体のリーク検出用溝１７
への拡散、伝播が遅くなり、ヘリウムブレナム７での検
出遅れが発生する。Therefore, when a leak point 19 occurs in the double-walled heat exchanger tube 12 as shown in FIG. 9, the flow resistance is large because the gap between the inner tube 10 and the outer tube 11 is extremely small.
As shown by the arrow in the figure, the leak detection groove 17 for leak fluid
Diffusion and propagation to the helium Blenheim 7 will be delayed, resulting in a delay in detection at Helium Blenheim 7.
一方、二重壁伝熱管１２の溶接方法は、第７図に示すよ
うにまず内管１０．１０同志を突合せ溶接２０によって
接続する。On the other hand, in the welding method for the double-walled heat exchanger tube 12, as shown in FIG. 7, the inner tubes 10 and 10 are first connected together by butt welding 20.
そして、内管１０の外周に外管１１．１１を挿入し外管
１１．１１の外周にスリーブ２１を嵌め込み、外管１１
とスリーブ２１をすみ肉溶接２２によって接続して内管
ｌＯの突合せ溶接２０の近傍に空間２３を形成していた
。Then, the outer tube 11.11 is inserted into the outer circumference of the inner tube 10, and the sleeve 21 is fitted onto the outer circumference of the outer tube 11.11.
and the sleeve 21 were connected by a fillet weld 22 to form a space 23 near the butt weld 20 of the inner pipe IO.
従来技術の二重壁伝熱管１２は第７図に示すように外管
１１同志をスリーブ２１で接続するので、外管１１の外
径寸法がすみ肉溶接２２とスリーブ２１で太き（なり、
組立の場合に上、下管板３，４やじゃま板２４への挿入
ができなくなり、外管１１に構造不連続部があるためス
リーブ２１に高応力が発生する欠点がある。また、スリ
ーブ２１と内管１０との空間２３が大きくなり伝熱性能
が低下する欠点がある。そして、すみ肉溶接２２のため
自動化作業がしにくく、すみ肉溶接２２を施した後の被
破壊検査がやりにくい等の欠点がある。In the conventional double-walled heat transfer tube 12, as shown in FIG.
When assembled, the sleeve 21 has the disadvantage that it cannot be inserted into the upper and lower tube plates 3 and 4 or the baffle plate 24, and that high stress is generated in the sleeve 21 because the outer tube 11 has a structural discontinuity. Further, there is a drawback that the space 23 between the sleeve 21 and the inner tube 10 becomes large, resulting in a decrease in heat transfer performance. Further, since the fillet welding 22 is performed, it is difficult to automate the work, and it is difficult to perform a destruction inspection after the fillet welding 22 is performed.
本発明はかかる従来の欠点を解消しようとするもので、
その目的とするところは、外管を連続構造にすることが
できる二重壁伝熱管の溶接方法及びリーク検出用溝の閉
塞が防止できる二重壁伝熱管式熱交換器を提供すること
にある。The present invention aims to eliminate such conventional drawbacks,
The purpose is to provide a welding method for a double-walled heat exchanger tube that allows the outer tube to have a continuous structure, and a double-walled heat exchanger tube type heat exchanger that can prevent the leak detection groove from clogging. .
本発明は前述の目的を達成するために、内管同志の外面
と外管同志の内面にそれぞれ環状溝を形成し、内管の環
状溝と外管の環状溝を合せて構成した環状空間から不活
性ガスを供給しながら溶接するようにした二重壁伝熱管
の溶接方法と、前記環状空間でリーク検出用溝を連絡す
るようにした二重壁伝熱管式熱交換器により達成される
。In order to achieve the above object, the present invention forms annular grooves on the outer surface of the inner tube and the inner surface of the outer tube, and creates an annular space formed by combining the annular groove of the inner tube and the annular groove of the outer tube. This is achieved by a double wall heat exchanger tube welding method in which welding is performed while supplying an inert gas, and a double wall heat exchanger tube type heat exchanger in which leak detection grooves are connected in the annular space.
外管同志の溶接時に、内管と外管の間に形成された環状
空間から不活性ガスが供給されるので、内管と外管の間
を周方向に流れる不活性ガスによって溶接部の裏波が均
一となり、リーク検出用溝が閉塞することがない。When welding the outer tubes together, inert gas is supplied from the annular space formed between the inner tube and the outer tube, so the inert gas flowing circumferentially between the inner tube and the outer tube will cause damage to the back of the weld. The waves are uniform and the leak detection groove is not blocked.
第１図は二重壁伝熱管の縦断面図、第２図は第１図の■
−■線横線面断面図３図は第２図の■■線断面の斜視図
、第４図は溶接方法を説明する縦断面図、第５図は他の
実施例を示す第２図の■−■線断面斜視図である。Figure 1 is a vertical cross-sectional view of a double-walled heat exchanger tube, and Figure 2 is the
Figure 3 is a perspective view of the cross section taken along line ■■ in Figure 2, Figure 4 is a longitudinal cross-sectional view for explaining the welding method, and Figure 5 is a cross-sectional view of Figure 2 showing another embodiment. It is a cross-sectional perspective view taken along the line -■.
第１図から第５図において、符号ｌＯから２０は従来の
ものと同一のものを示す。In FIGS. 1 to 5, symbols 10 to 20 indicate the same components as the conventional ones.
２５′は内管１０の外側に設けた環状溝、２６は外管１
１の内側に設けた環状溝、２７は内管１０の環状溝２５
と外管１１の環状溝２６によって形成された環状空間、
２８は外管１１同志の突合せ溶接、２９は外管１１同志
の隙間である。25' is an annular groove provided on the outside of the inner tube 10, and 26 is the outer tube 1.
1 is an annular groove provided inside the inner tube 10, and 27 is an annular groove 25 of the inner tube 10.
and an annular space formed by the annular groove 26 of the outer tube 11,
28 is a butt weld between the outer tubes 11, and 29 is a gap between the outer tubes 11.
この様な構造において、二重壁伝熱管１２の溶接方法に
ついて説明する。In such a structure, a method of welding the double-walled heat exchanger tube 12 will be explained.
二重壁伝熱管１２の内管１０と内管１０は、第４図に示
すように外管１１と外管１１の隙間２９から突合せ溶接
２０が行われる。内管ｌＯと内管１０の突合せ溶接２０
が行われた後に、外管１１と外管１１の溶接を行うが、
相互の外管１１．１１を溶接する前に、内管１０と内管
１０の外面側及び外管１１と外管１１の内面側を、各々
の管の必要板厚以上の厚さが残る厚さの範囲内で削り加
工して内管１０の外面には環状溝２５、外管１１の内面
には環状溝２６を形成する。As shown in FIG. 4, butt welding 20 is performed between the inner tubes 10 of the double-walled heat transfer tube 12 through the gap 29 between the outer tubes 11. Butt welding 20 of inner pipe IO and inner pipe 10
After that, the outer tube 11 and the outer tube 11 are welded,
Before welding the outer tubes 11 and 11 to each other, the outer surfaces of the inner tube 10 and the inner tube 10 and the inner surfaces of the outer tube 11 and the outer tube 11 are made so that the thickness remains at least the required thickness of each tube. An annular groove 25 is formed on the outer surface of the inner tube 10 and an annular groove 26 is formed on the inner surface of the outer tube 11 by cutting within the range of the diameter.
そして、この環状溝２５．２６を合わせることによって
環状空間２７が形成され、第３図に示すようにリーク検
出用溝１７から環状空間２７へ不活性ガスを供給しなが
ら第１図に示すように外管１１．１１同志を突合せ溶接
２８によって接合する。An annular space 27 is formed by aligning these annular grooves 25 and 26, and while supplying inert gas from the leak detection groove 17 to the annular space 27 as shown in FIG. The outer tubes 11 and 11 are joined together by butt welding 28.
第１図において、外管１１．１１の突合せ溶接２８を行
なう時に、不活性ガスは、第３図に示すように内管１０
と外管１１の間に位置するリーク検出用溝１７から環状
空間２７を通して供給されるが溶接部において、内管１
０と外管１１との間の環状空間２７が、内管１０の外面
から内側へ、外管１１の内面から外側へ広がっているた
め、内管１０と外管１１の間を主としてリーク検出用溝
１７を通って供給される不活性ガスは第３図に示す様に
リーク検出用溝１７がら吹出した時点で環状空間２７の
周方向に広がり、突合せ溶接２８の裏波たれ込みが多く
生じたり、突合せ溶接２８により、内管ｌＯと外管１１
が融着することは防止される。In FIG. 1, when performing the butt welding 28 of the outer tube 11.11, the inert gas is applied to the inner tube 10 as shown in FIG.
It is supplied through the annular space 27 from the leak detection groove 17 located between the inner pipe 1 and the outer pipe 11 at the welding part
Since the annular space 27 between the inner tube 10 and the outer tube 11 extends inward from the outer surface of the inner tube 10 and outward from the inner surface of the outer tube 11, the space between the inner tube 10 and the outer tube 11 is mainly used for leak detection. As shown in FIG. 3, the inert gas supplied through the groove 17 spreads in the circumferential direction of the annular space 27 when it is blown out of the leak detection groove 17, causing a lot of sag in the butt weld 28. By butt welding 28, the inner pipe lO and the outer pipe 11 are connected.
is prevented from fusing.
第５図は第３図の他の実施例を示すもので、第３図のも
のと異なる点は第３図に示すものにおいては外管１１．
１１のリーク検出用溝１７が直線的に配置されているが
、第５図に示すものにおいては、リーク検出用溝１７．
１７が互い違いに配置されているのみで、他の説明は第
３図のものと同一である。FIG. 5 shows another embodiment of the embodiment shown in FIG. 3, and the difference from the embodiment shown in FIG. 3 is that the outer tube 11.
Although eleven leak detection grooves 17 are arranged linearly, in the one shown in FIG. 5, the leak detection grooves 17.
17 are arranged alternately, and the other explanations are the same as those in FIG.
第５図に示す他の実施例のものは、二重壁伝熱管１２の
外管１１の突合せ溶接２８において、溶接する相互の管
のリーク検出用溝１７．１７の位置を管の周方向に互い
にずらした状態で不活性ガスの供給を行って突合せ溶接
２８を行なうものである。この実施例の効果は、第５図
に示す様に一方の管のリーク検出用溝１７を通って供給
される不活性ガスが、突合せ溶接２８において、周方向
に確実に流れて他方の管のリーク検出用溝１７に流れ込
むことになり、内管１０と外管１１が融着することが防
止でき、裏波たれ込みが大きくなってリーク検出用溝１
７を閉塞することがなくなる。In another embodiment shown in FIG. 5, in the butt welding 28 of the outer tube 11 of the double-walled heat exchanger tube 12, the positions of the leak detection grooves 17 and 17 of the mutually welded tubes are adjusted in the circumferential direction of the tubes. Butt welding 28 is performed by supplying inert gas while being shifted from each other. The effect of this embodiment is that the inert gas supplied through the leak detection groove 17 of one pipe reliably flows in the circumferential direction at the butt weld 28, as shown in FIG. This causes the flow to flow into the leak detection groove 17, preventing the inner tube 10 and the outer tube 11 from being fused together, and increasing the amount of leakage flowing into the leak detection groove 1.
7 will no longer be blocked.
以上述べた二重壁伝熱管の溶接方法について説明したが
、第１図から第５図に示す突合せ溶接２８によって接合
された二重壁伝熱管１２で熱交換器を構成すれば、管板
や邪魔板への挿入は外径寸法に変化がないので容易とな
り、外管１１は構造連続部となるので応力集中が軽減さ
れ、伝熱性能は向上する。The welding method for double-walled heat exchanger tubes has been explained above, but if a heat exchanger is constructed of double-walled heat exchanger tubes 12 joined by butt welding 28 shown in FIGS. 1 to 5, the tube plate and Insertion into the baffle plate is easy because there is no change in the outer diameter dimension, and since the outer tube 11 becomes a continuous part of the structure, stress concentration is reduced and heat transfer performance is improved.
なお、環状空間２７は外管１１の突合せ溶接２８を行な
う場合には、不活性ガスを突合せ溶接２８の裏側から管
の周方向へ供給するために役立ち、溶接完了後はリーク
検出用溝１７．１７を連絡する連絡通路としても役立つ
ので、内管１０、外管１１のリーク検出をより確実に行
うことができる。Note that when butt welding 28 of the outer tube 11 is performed, the annular space 27 serves to supply inert gas from the back side of the butt weld 28 to the circumferential direction of the tube, and after welding is completed, the leak detection groove 17. Since it also serves as a communication path for communicating the inner tube 10 and the outer tube 11, leak detection between the inner tube 10 and the outer tube 11 can be performed more reliably.
本発明によれば、二重壁伝熱管の外管溶接時に不活性ガ
スを溶接部全周にわたって均一に流すことができるので
局所的な裏波たれ込みによる内管と外管の融着やリーク
検出用溝の閉塞が防止できる。また、溶込み不良等によ
る欠陥の発生を防止できる。さらに、スリーブを使用す
る従来技術に比較して、溶接箇所が半減し、製作期間の
大巾な短縮が計れると共に、放射線透過試験及び超音波
探傷試験を行うことが可能となり、信転性の高い溶接部
、熱交換となる。According to the present invention, when welding the outer tube of a double-walled heat exchanger tube, inert gas can be uniformly flowed over the entire circumference of the welded part, so we can detect fusion and leakage between the inner tube and outer tube due to local sag. This prevents the drainage ditch from clogging. Moreover, the occurrence of defects due to poor penetration etc. can be prevented. Furthermore, compared to conventional technology that uses sleeves, the number of welding points is halved, significantly shortening the manufacturing period, and it is also possible to perform radiographic tests and ultrasonic flaw detection tests, resulting in high reliability. The welded part becomes a heat exchanger.
第１図から第５図は本発明の実施例に係るもので、第１
図は二重壁伝熱管の縦断面図、第２図は第１図のｕ−ｎ
線機断面図、第３図および第５図は第２図のｍ−ｍ線断
面の斜視図、第４図は溶接方法を説明する縦断面図、第
６図は二重壁伝熱管式熱交換器の縦断面図、第７図は従
来の二重壁伝熱管の縦断面図、第８図は第７図の■−■
線横線面断面図９図は外管の展開図である。
１０・・・・・・内管、１１・・・・・・外管、１２・
・・・・・二重壁伝熱管、１７・・・・・・リーク検出
用溝、２５．２６・・・・・・環状溝、２７・・・・・
・環状空間。1 to 5 relate to embodiments of the present invention, and the first
The figure is a vertical cross-sectional view of a double-walled heat exchanger tube, and Figure 2 is the u-n of Figure 1.
Figures 3 and 5 are perspective views of the mm-m line cross section in Figure 2, Figure 4 is a longitudinal cross-sectional view explaining the welding method, and Figure 6 is a double-walled heat exchanger tube type heat exchanger. A longitudinal cross-sectional view of the exchanger, Fig. 7 is a longitudinal cross-sectional view of a conventional double-walled heat transfer tube, and Fig. 8 is a cross-sectional view of the conventional double-walled heat exchanger tube.
FIG. 9, which is a horizontal cross-sectional view, is a developed view of the outer tube. 10... Inner tube, 11... Outer tube, 12.
...Double wall heat exchanger tube, 17...Leak detection groove, 25.26...Annular groove, 27...
- Annular space.
Claims (2)
からなる二重壁伝熱管の内管同志と外管同志を突合せ溶
接によつて接合するに、前記内管同志の外面と外管同志
の内面にそれぞれ環状溝を形成し、内管の環状溝と外管
の環状溝を合せて構成した環状空間から不活性ガスを供
給しながら溶接することを特徴とする二重壁伝熱管の溶
接方法。(1) When the inner tube and the outer tube of a double-walled heat exchanger tube consisting of an inner tube and an outer tube having a leak detection groove on the inner surface of the tube are joined by butt welding, the outer surface of the inner tube is joined by butt welding. An annular groove is formed on the inner surface of the inner tube and the outer tube, respectively, and welding is performed while an inert gas is supplied from an annular space formed by combining the annular groove of the inner tube and the annular groove of the outer tube. How to weld heat exchanger tubes.
からなる二重壁伝熱管の内管内の被加熱流体と外管外の
加熱流体が熱交換するものにおいて、前記内管同志の外
面と外管同志の内面にそれぞれ環状溝を形成し、内管の
環状溝と外管の環状溝を合せて構成した環状空間でリー
ク検出用溝を連絡したことを特徴とする熱交換器。(2) In a double-walled heat transfer tube consisting of an inner tube and an outer tube having a leak detection groove on the inner surface of the tube, the fluid to be heated in the inner tube and the heated fluid outside the outer tube exchange heat, wherein the inner tube A heat exchanger characterized in that annular grooves are formed on the outer surface of the inner tube and the inner surface of the outer tube, and the leak detection groove is connected to the annular space formed by combining the annular grooves of the inner tube and the outer tube. vessel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1002067A JP2746970B2 (en) | 1989-01-10 | 1989-01-10 | Double wall heat transfer tube welding method and heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1002067A JP2746970B2 (en) | 1989-01-10 | 1989-01-10 | Double wall heat transfer tube welding method and heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02183795A true JPH02183795A (en) | 1990-07-18 |
| JP2746970B2 JP2746970B2 (en) | 1998-05-06 |
Family
ID=11519001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1002067A Expired - Fee Related JP2746970B2 (en) | 1989-01-10 | 1989-01-10 | Double wall heat transfer tube welding method and heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2746970B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2527076A4 (en) * | 2010-01-20 | 2017-06-28 | Kabushiki Kaisha Toshiba | Double-walled pipe, method for manufacturing double-walled pipe, and vapor generator |
| CN115958326A (en) * | 2023-03-16 | 2023-04-14 | 江苏伟力无损检测设备制造有限公司 | Pipe plate radiographic inspection welding equipment and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63252679A (en) * | 1987-04-10 | 1988-10-19 | Babcock Hitachi Kk | Welding method for double pipe |
-
1989
- 1989-01-10 JP JP1002067A patent/JP2746970B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63252679A (en) * | 1987-04-10 | 1988-10-19 | Babcock Hitachi Kk | Welding method for double pipe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2527076A4 (en) * | 2010-01-20 | 2017-06-28 | Kabushiki Kaisha Toshiba | Double-walled pipe, method for manufacturing double-walled pipe, and vapor generator |
| CN115958326A (en) * | 2023-03-16 | 2023-04-14 | 江苏伟力无损检测设备制造有限公司 | Pipe plate radiographic inspection welding equipment and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2746970B2 (en) | 1998-05-06 |
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