JP4646383B2 - Multi-tube heat exchanger - Google Patents

Multi-tube heat exchanger Download PDF

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Publication number
JP4646383B2
JP4646383B2 JP2000350752A JP2000350752A JP4646383B2 JP 4646383 B2 JP4646383 B2 JP 4646383B2 JP 2000350752 A JP2000350752 A JP 2000350752A JP 2000350752 A JP2000350752 A JP 2000350752A JP 4646383 B2 JP4646383 B2 JP 4646383B2
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Prior art keywords
tube
heat transfer
tube sheet
transfer tube
sheet
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JP2002156196A (en
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正一郎 臼井
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Usui Co Ltd
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Usui Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
    • F28F9/182—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding the heat-exchange conduits having ends with a particular shape, e.g. deformed; the heat-exchange conduits or end plates having supplementary joining means, e.g. abutments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1607—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with particular pattern of flow of the heat exchange media, e.g. change of flow direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
    • F28F9/185—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding with additional preformed parts

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、一般産業用、自動車用などに用いられる多管式熱交換器とその製造方法に関する。
【０００２】
【従来の技術】
ＥＧＲガスの冷却等に用いられる多管式熱交換器としては、図５にその一例を示すごとく、両端部に第１熱交換流体入口１１−１および出口１１−２を設けた胴管（シェル）１１内部において、伝熱管（チューブ）群１２の両端部が板金製のチューブシート１３にろう付けにより固定され、一方、チューブシート１３はその外周端部を胴管１１の内壁にろう付けにより固着して配列され、前記胴管１１の両端部には第２熱交換流体入口１４−１および出口１４−２が設けられた端部キャップ（ボンネット）１４が固着された構成となしている。
【０００３】
このような構成で全体がろう付けされた構造の多管式熱交換器は、両端部に第１熱交換流体入口１１−１および出口１１−２が設けられた胴管１１、該胴管１１の内壁の両端部付近に設けられるチューブシート１３、該チューブシートに支持される伝熱管群１２、および前記胴管１１の両端部に配設される第２熱交換流体入口および出口が設けられた端部キャップ１４を組立てた後、全体をろう付け炉に装入し炉中ろう付けする方法にて製造される。
【０００４】
図５に示すような従来の多管式熱交換器におけるチューブシートに貫通支持される伝熱管のろう付け部は、図６に示すごとく伝熱管１２−１の外周面のみチューブシート１３にろう付けされたものが一般的である。すなわち、図６（ａ）は、薄肉チューブシート１３−１に伝熱管１２−１の端部をろう付けする例であり、この場合は外向きのバーリング壁１３−１ａを設けた貫通孔に伝熱管１２−１の端部を挿入した状態で当該伝熱管の外周面をバーリング壁１３−１ａにろう付けしたもの、（ｂ）も同じく薄肉チューブシート１３−１に伝熱管１２−１の端部をろう付けする例であり、この場合は内向きのバーリング壁１３−１ｂを設けた貫通孔に伝熱管１２−１の端部を挿入した状態で当該伝熱管の外周面をバーリング壁１３−１ｂにろう付けしたもの、（ｃ）は厚肉チューブシート１３−２に伝熱管１２−１の端部をろう付けする例であり、この場合は厚肉チューブシート１３−２に設けた貫通孔に伝熱管１２−１の端部を挿入した状態で当該伝熱管の外周面を厚肉チューブシート１３−２にろう付けしたものである
【０００５】
【発明が解決しようとする課題】
しかるに、これらの多管式熱交換器は、エンジンや走行中に生じる振動やＥＧＲガス自体の圧力変動に伴う脈動等による振動環境下に置かれるため、伝熱管とチューブシートとの接合箇所に応力集中し易い。このため伝熱管の外周面のみチューブシートにろう付けされた短いろう付け長さのため接合部ではかかる応力集中により接合部に亀裂が入り、強度低下をきたすとともに、該亀裂より熱交換流体が漏れるなどの現象が起こり、伝熱管とチューブシートとのろう付け部の信頼性に問題があった。
【０００６】
本発明はこのような従来技術の問題を解決するためになされたもので、各伝熱管の内外周面をチューブシートにろう付けすることによりろう付け長さが長くなって、前記応力に十分耐え得るチューブシートと伝熱管のろう付け部を有する、高耐久性と信頼性に富む高品質の多管式熱交換器を提供しようとするものである。
【０００７】
【課題を解決するための手段】
本発明は前記した従来技術の課題を解決する手段として、各伝熱管の少なくとも一方の内外周面をチューブシートにろう付けすることにより、該ろう付け部の強度を高めて耐久性の向上をはかろうとするもので、その要旨は、両端部に第１熱交換流体入口および出口が設けられた胴管、該胴管の内壁の両端部付近に設けられるチューブシート、該チューブシートに支持される伝熱管群、および前記胴管の両端部に配設される第２熱交換流体入口および出口が設けられた端部キャップが、それぞれろう付けにて一体化された構造の多管式熱交換器において、前記伝熱管の少なくとも片端の内端面および外端面がチューブシートにろう付けされていることを特徴とするものである。
この多管式熱交換器において、前記伝熱管の内端面および外端面とチューブシートとのろう付け構造としては、▲１▼チューブシートが薄肉の場合は当該チューブシートの貫通孔部に断面Ｕ字形の環状折返し部を設け、該環状折返し部に伝熱管の開口端部を嵌入し当該部分をろう付けして構成してなるろう付け構造、▲２▼チューブシートが薄肉の場合は当該チューブシートに断面Ｕ字形の環状折返し部を設け、該薄肉チューブシートより厚肉で剛性の高い平板に前記Ｕ字形の環状折返し部を設けた貫通孔と対応する位置に前記貫通孔より僅かに大径の貫通孔を設けた背面板とチューブシートとを一体化し、前記環状折返し部に伝熱管の開口端部を嵌入し当該部分をろう付けして構成してなるろう付け構造、▲３▼チューブシートが厚肉の場合は当該チューブシートに伝熱管の外径より大きい貫通孔を穿設し、該貫通孔に伝熱管の端部を挿入した状態でチューブシートの内面および外面にサポートプレートを介してろう付けして構成してなるろう付け構造、▲４▼チューブシートが厚肉の場合は当該チューブシートの貫通孔に伝熱管の端部を挿入した状態で、チューブシートの外面に伝熱管内面側にバーリング壁を有するサポートプレートを介してろう付けするとともに、チューブシートの内面に伝熱管の外面をろう付けして構成してなるろう付け構造を用いることができる。
【０００８】
【発明の実施の形態】
図１は本発明に係る多管式熱交換器のチューブシートと伝熱管のろう付け部の一実施例を示す一部拡大断面図、図２は同じくチューブシートと伝熱管のろう付け部の他の実施例を示す一部拡大断面図、図３は同じくチューブシートと伝熱管のろう付け部の別の実施例を示す一部拡大断面図、図４は同じくチューブシートと伝熱管のろう付け部のさらに他の実施例を示す一部拡大断面図であり、１は胴管、２は伝熱管、３Ａ、３Ｂ、３Ｃ、３Ｄはチューブシート、４は端部キャップ、５は背面板である。
【０００９】
すなわち図１に示す多管式熱交換器は、薄肉のチューブシート３Ａに伝熱管２をろう付けしたもので、その薄肉チューブシート３Ａと伝熱管２のろう付け部の構造は、薄肉チューブシート３Ａの貫通孔部に外側に突出する断面Ｕ字形の環状折返し部３Ａ−１を設け、この環状折返し部３Ａ−１に伝熱管２の端部を嵌入し、当該部分をろう付けすることにより伝熱管２の内端面および外端面がチューブシート３Ａにろう付けされている。すなわち、この多管式熱交換器の場合は、各伝熱管２の管端の内外両面および端面が薄肉チューブシート３Ａにろう付けされている。
【００１０】
次に図２に示す多管式熱交換器は、図１に示すものと同様、断面Ｕ字形の環状折返し部３Ｂ−１を設けた貫通孔を有する薄肉チューブシート３Ｂに伝熱管２をろう付けしたものを、該薄肉チューブシート３Ｂより厚肉で剛性の高い平板に前記環状折返し部３Ｂ−１を設けた貫通孔と対応する位置に前記貫通孔より僅かに大径の貫通孔５−１を設けた背面板５とろう付けてして一体化したもので、この多管式熱交換器の場合も各伝熱管２の管端の内外両面および端面が、背面板５と一体の薄肉チューブシート３Ｂにろう付けされている。
【００１１】
一方、図３、図４に示す多管式熱交換器は、厚肉のチューブシート３Ｃ、３Ｄに伝熱管２をろう付けしたもので、図３に示す厚肉チューブシート３Ｃと伝熱管２のろう付け構造は、厚肉チューブシート３Ｃに伝熱管２の外径より僅かに大きい貫通孔３Ｃ−１を穿設し、該貫通孔に伝熱管２の端部を挿入した状態で厚肉チューブシート３Ｃの内面および外面に２個のサポートプレートＰ１、Ｐ２を介してろう付けして構成するもので、この場合、厚肉チューブシート３Ｃの内面と伝熱管２の外面との間に設けるサポートプレートＰ１は、伝熱管２が摺動可能な貫通孔の周縁部に外向きに形成したバーリング壁Ｐ１−１を有し、このバーリング壁Ｐ１−１を有する貫通孔に伝熱管２の端部を挿入してろう付けする。また、厚肉チューブシート３Ｃの外面と伝熱管２の内面との間に設けるサポートプレートＰ２は、伝熱管２内に嵌入し得るバーリング壁Ｐ２−１を有し、このバーリング壁Ｐ２−１を伝熱管２内に嵌入してろう付けする。したがって、この多管式熱交換器の場合も各伝熱管２管端の少なくとも内外両面が、好ましくは端面が、２つのサポートプレートＰ１、Ｐ２を介して厚肉チューブシート３Ｃにろう付けされている。
【００１２】
また、図４に示す厚肉チューブシート３Ｄと伝熱管２のろう付け構造は、厚肉チューブシート３Ｄに伝熱管２の外径とほぼ等しい径の貫通孔３Ｄ−１を穿設し、この貫通孔３Ｄ−１に伝熱管２の端部を挿入した状態で、伝熱管２の管端の少なくとも外周面を厚肉チューブシート３Ｄの貫通孔３Ｄ−１の内面にろう付けするとともに、バーリング壁Ｐ３−１を有するサポートプレートＰ３を介して伝熱管２の管端の内周面および好ましくは端面を厚肉チューブシート３Ｄの外面にろう付けして構成したものである。
【００１３】
なお、伝熱管の材質としては、ＳＵＳ３０４、ＳＵＳ３０４Ｌ、ＳＵＳ３１６、ＳＵＳ３１６Ｌ、ＳＵＳ３２１などのオーステナイト系ステンレス鋼などが用いられ、外径は種々のものが使用されるがＥＧＲクーラー用では８．０ｍｍ〜５．００ｍｍで、長さは１２０〜６００ｍｍ程度のものが多いが特に長さの制限はない。また、胴管やチューブシートも伝熱管と同様の材質である。このような材質の多管式熱交換器における伝熱管群とチューブシートの固着に使用されるろう材としては、例えばＣｒ７ｗｔ％、Ｂ３ｗｔ％、Ｓｉ４ｗｔ％、Ｆｅ３ｗｔ％、残部ＮｉからなるＮｉ基ろう材である。
【００１４】
【発明の効果】
以上説明したごとく、本発明に係る多管式熱交換器は、各伝熱管の少なくとも片側端部の内面および外面をチューブシートにろう付けしてなるから、ろう付け長さが長くなり強度的に優れたろう付け部が得られ、したがって該ろう付け部には応力集中により亀裂が入ることもなくなり、耐久性、信頼性に富む。また、特に断面Ｕ字形の環状折返し部を設けたチューブシートの場合は、ろう付け時の熱膨張に伴う伝熱管の膨張収縮に追従可能であることから、熱応力の発生を防止あるいは緩和できる効果もある。
【図面の簡単な説明】
【図１】本発明に係る多管式熱交換器のチューブシートと伝熱管のろう付け部の一実施例を示す一部拡大断面図である。
【図２】同じくチューブシートと伝熱管のろう付け部の他の実施例を示す一部拡大断面図である。
【図３】同じくの別の実施例を示す一部拡大断面図である。
【図４】同じくチューブシートと伝熱管のろう付け部のさらに他の実施例を示す一部拡大断面図である。
【図５】本発明の対象とする従来の多管式熱交換器の一例を中央部を省略して示す横断平面図である。
【図６】同上従来の多管式熱交換器におけるチューブシートと伝熱管のろう付け部を示す一部拡大断面図で、（ａ）は薄肉チューブシートに伝熱管をろう付けした例、（ｂ）は薄肉チューブシートに伝熱管をろう付けした他の例、（ｃ）は厚肉チューブシートに伝熱管をろう付けした例をそれぞれ示す。
【符号の説明】
１ 胴管
１−１ 第１熱交換流体入口
１−２ 第１熱交換流体出口
２ 伝熱管
３、３Ａ、３Ｂ、３Ｃ、３Ｄ チューブシート
４ 端部キャップ
５ 背面板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multi-tube heat exchanger used for general industrial use, automobile use, and the like, and a method for manufacturing the same.
[0002]
[Prior art]
As a multitubular heat exchanger used for cooling EGR gas, etc., as shown in FIG. 5, for example, a shell tube (shell) provided with a first heat exchange fluid inlet 11-1 and an outlet 11-2 at both ends. ) 11, both ends of the heat transfer tube (tube) group 12 are fixed to the sheet metal tube sheet 13 by brazing, while the tube sheet 13 is fixed to the inner wall of the trunk tube 11 by brazing. The end caps (bonnets) 14 provided with the second heat exchange fluid inlets 14-1 and the outlets 14-2 are fixed to both ends of the trunk tube 11.
[0003]
The multi-tubular heat exchanger having the structure brazed as a whole in such a configuration includes a trunk pipe 11 provided with a first heat exchange fluid inlet 11-1 and an outlet 11-2 at both ends, and the trunk pipe 11. A tube sheet 13 provided in the vicinity of both ends of the inner wall, a heat transfer tube group 12 supported by the tube sheet, and a second heat exchange fluid inlet and outlet disposed at both ends of the body tube 11. After the end cap 14 is assembled, it is manufactured by charging the whole into a brazing furnace and brazing in the furnace.
[0004]
The brazed portion of the heat transfer tube supported through the tube sheet in the conventional multi-tube heat exchanger as shown in FIG. 5 is brazed to the tube sheet 13 only on the outer peripheral surface of the heat transfer tube 12-1 as shown in FIG. What is done is common. That is, FIG. 6A is an example in which the end of the heat transfer tube 12-1 is brazed to the thin tube sheet 13-1, and in this case, the heat transfer to the through hole provided with the outward burring wall 13-1a. The end portion of the heat transfer tube 12-1 is also attached to the thin tube sheet 13-1 by brazing the outer peripheral surface of the heat transfer tube to the burring wall 13-1a with the end portion of the heat tube 12-1 inserted. In this case, the outer peripheral surface of the heat transfer tube is inserted into the burring wall 13-1b with the end of the heat transfer tube 12-1 inserted into the through hole provided with the inward burring wall 13-1b. (C) is an example of brazing the end of the heat transfer tube 12-1 to the thick tube sheet 13-2. In this case, the through hole provided in the thick tube sheet 13-2 Heat transfer with the end of the heat transfer tube 12-1 inserted The outer peripheral surface of the is obtained by brazing the thick tubesheet 13-2 [0005]
[Problems to be solved by the invention]
However, these multi-tubular heat exchangers are placed in a vibration environment caused by vibrations generated during engine and running, or pulsation caused by pressure fluctuations of the EGR gas itself, and therefore stress is applied to the joint between the heat transfer tube and the tube sheet. Easy to concentrate. For this reason, only the outer peripheral surface of the heat transfer tube is brazed to the tube sheet, so that the stress concentration at the joint causes cracks in the joint, resulting in a decrease in strength, and heat exchange fluid leaks from the crack. As a result, there was a problem in the reliability of the brazed part between the heat transfer tube and the tube sheet.
[0006]
The present invention has been made to solve such a problem of the prior art, and the brazing length is increased by brazing the inner and outer peripheral surfaces of each heat transfer tube to the tube sheet, so that the above-mentioned stress can be sufficiently resisted. It is an object of the present invention to provide a high-quality multi-tubular heat exchanger that has a tube sheet and a heat transfer tube brazed portion, and is highly durable and reliable.
[0007]
[Means for Solving the Problems]
In the present invention, as means for solving the above-described problems of the prior art, at least one of the inner and outer peripheral surfaces of each heat transfer tube is brazed to a tube sheet, thereby increasing the strength of the brazed portion and improving durability. The gist of the invention is that the gist is supported by the tube sheet provided with the first heat exchange fluid inlet and outlet at both ends, the tube sheet provided near both ends of the inner wall of the tube, and the tube sheet. A heat exchanger tube group and a multi-tube heat exchanger having a structure in which end caps provided with second heat exchange fluid inlets and outlets disposed at both ends of the trunk tube are integrated by brazing, respectively. In the above, the inner end surface and the outer end surface of at least one end of the heat transfer tube are brazed to the tube sheet.
In this multi-tube heat exchanger, the inner end face and outer end face of the heat transfer tube and the tube sheet are brazed as follows: (1) If the tube sheet is thin, the through hole of the tube sheet has a U-shaped cross section. A brazed structure formed by inserting an open end of a heat transfer tube into the annular folded portion and brazing the portion, and (2) if the tube sheet is thin, A U-shaped annular turn-up portion is provided, and a through-hole slightly larger in diameter than the through-hole at a position corresponding to the through-hole provided with the U-shaped turn-up portion on a flat plate that is thicker and more rigid than the thin tube sheet. A brazing structure in which a back plate having a hole and a tube sheet are integrated, and an opening end of a heat transfer tube is fitted into the annular folded portion and the portion is brazed, and the tube sheet is thick. Meat place Is formed by drilling a through hole larger than the outer diameter of the heat transfer tube in the tube sheet and brazing the inner and outer surfaces of the tube sheet via a support plate with the end of the heat transfer tube inserted into the through hole. (4) When the tube sheet is thick, the end of the heat transfer tube is inserted into the through hole of the tube sheet, and the outer surface of the tube sheet has a burring wall on the inner surface of the heat transfer tube While brazing via a support plate, the brazing structure formed by brazing the outer surface of the heat transfer tube to the inner surface of the tube sheet can be used.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a partially enlarged sectional view showing an embodiment of a brazed portion of a tube sheet and a heat transfer tube of a multi-tube heat exchanger according to the present invention, and FIG. 2 is another view of the brazed portion of the tube sheet and the heat transfer tube. FIG. 3 is a partially enlarged sectional view showing another embodiment of the brazed portion of the tube sheet and the heat transfer tube, and FIG. 4 is also a brazed portion of the tube sheet and the heat transfer tube. 4 is a partially enlarged cross-sectional view showing still another embodiment of the present invention, wherein 1 is a trunk tube, 2 is a heat transfer tube, 3A, 3B, 3C and 3D are tube sheets, 4 is an end cap, and 5 is a back plate.
[0009]
That is, the multi-tube heat exchanger shown in FIG. 1 is obtained by brazing the heat transfer tube 2 to the thin tube sheet 3A, and the structure of the brazed portion of the thin tube sheet 3A and the heat transfer tube 2 is the thin tube sheet 3A. An annular folded portion 3A-1 having a U-shaped cross section protruding outward is provided in the through-hole portion of this tube, and the end portion of the heat transfer tube 2 is fitted into the annular folded portion 3A-1, and the portion is brazed to thereby heat transfer tube Two inner end surfaces and outer end surfaces are brazed to the tube sheet 3A. That is, in the case of this multi-tube heat exchanger, the inner and outer surfaces and end surfaces of the tube ends of each heat transfer tube 2 are brazed to the thin tube sheet 3A.
[0010]
Next, the multitubular heat exchanger shown in FIG. 2 brazes the heat transfer tube 2 to a thin tube sheet 3B having a through hole provided with an annular folded portion 3B-1 having a U-shaped cross section, similar to that shown in FIG. A through hole 5-1 having a diameter slightly larger than that of the through hole is formed at a position corresponding to the through hole in which the annular folded portion 3B-1 is provided on a flat plate thicker and more rigid than the thin tube sheet 3B. It is integrated by brazing the provided back plate 5, and in the case of this multi-tube heat exchanger, the inner and outer surfaces and the end surfaces of the tube ends of each heat transfer tube 2 are integrated with the back plate 5. It is brazed to 3B.
[0011]
On the other hand, the multi-tube heat exchanger shown in FIGS. 3 and 4 is obtained by brazing the heat transfer tube 2 to the thick tube sheets 3C and 3D, and the thick tube sheet 3C and the heat transfer tube 2 shown in FIG. In the brazing structure, the thick tube sheet 3C is provided with a through hole 3C-1 slightly larger than the outer diameter of the heat transfer tube 2, and the end of the heat transfer tube 2 is inserted into the through hole. It is configured by brazing the inner surface and the outer surface of 3C via two support plates P1 and P2. In this case, the support plate P1 provided between the inner surface of the thick tube sheet 3C and the outer surface of the heat transfer tube 2 Has a burring wall P1-1 formed outward at the peripheral edge of the through hole in which the heat transfer tube 2 can slide, and the end of the heat transfer tube 2 is inserted into the through hole having the burring wall P1-1. Braze. The support plate P2 provided between the outer surface of the thick tube sheet 3C and the inner surface of the heat transfer tube 2 has a burring wall P2-1 that can be fitted into the heat transfer tube 2, and transmits the burring wall P2-1. Fit into the heat tube 2 and braze. Accordingly, also in the case of this multi-tube heat exchanger, at least both the inner and outer surfaces, preferably the end surfaces of the tube ends of each heat transfer tube 2 are brazed to the thick tube sheet 3C via the two support plates P1 and P2. .
[0012]
Further, in the brazed structure of the thick tube sheet 3D and the heat transfer tube 2 shown in FIG. 4, a through hole 3D-1 having a diameter substantially equal to the outer diameter of the heat transfer tube 2 is formed in the thick tube sheet 3D. With the end of the heat transfer tube 2 inserted into the hole 3D-1, at least the outer peripheral surface of the tube end of the heat transfer tube 2 is brazed to the inner surface of the through hole 3D-1 of the thick tube sheet 3D, and the burring wall P3 The inner peripheral surface and preferably the end surface of the tube end of the heat transfer tube 2 are brazed to the outer surface of the thick tube sheet 3D via a support plate P3 having -1.
[0013]
In addition, as a material of the heat transfer tube, austenitic stainless steel such as SUS304, SUS304L, SUS316, SUS316L, SUS321, and the like are used, and various outer diameters are used. The length is 00 mm and the length is often about 120 to 600 mm, but the length is not particularly limited. The trunk tube and the tube sheet are also made of the same material as the heat transfer tube. As the brazing material used for fixing the heat transfer tube group and the tube sheet in the multi-tube heat exchanger of such a material, for example, a Ni-based brazing material composed of Cr 7 wt%, B 3 wt%, Si 4 wt%, Fe 3 wt% and the balance Ni It is.
[0014]
【The invention's effect】
As described above, the multi-tube heat exchanger according to the present invention is formed by brazing at least one inner end and outer surface of each heat transfer tube to the tube sheet, so that the brazing length is increased and the strength is increased. An excellent brazed portion is obtained, and therefore the brazed portion is not cracked due to stress concentration, and is excellent in durability and reliability. Further, particularly in the case of a tube sheet provided with an annular folded portion having a U-shaped cross section, it is possible to follow the expansion and contraction of the heat transfer tube accompanying the thermal expansion during brazing, so that the effect of preventing or mitigating the generation of thermal stress There is also.
[Brief description of the drawings]
FIG. 1 is a partially enlarged cross-sectional view showing an embodiment of a brazed portion of a tube sheet and a heat transfer tube of a multi-tube heat exchanger according to the present invention.
FIG. 2 is a partially enlarged sectional view showing another embodiment of the brazed portion of the tube sheet and the heat transfer tube.
FIG. 3 is a partially enlarged cross-sectional view showing another similar example.
FIG. 4 is a partially enlarged sectional view showing still another embodiment of the brazed portion of the tube sheet and the heat transfer tube.
FIG. 5 is a cross-sectional plan view showing an example of a conventional multi-tube heat exchanger that is the subject of the present invention, with the central portion omitted.
FIG. 6 is a partially enlarged cross-sectional view showing a brazed portion of a tube sheet and a heat transfer tube in the conventional multi-tube heat exchanger, wherein (a) is an example of brazing the heat transfer tube to a thin-walled tube sheet; ) Shows another example in which a heat transfer tube is brazed to a thin tube sheet, and (c) shows an example in which a heat transfer tube is brazed to a thick tube sheet.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Body pipe 1-1 1st heat exchange fluid inlet 1-2 1st heat exchange fluid outlet 2 Heat transfer pipe 3, 3A, 3B, 3C, 3D Tube sheet 4 End cap 5 Back plate

Claims (1)

両端部に第１熱交換流体入口および出口が設けられた胴管、該胴管の内壁の両端部付近に設けられるチューブシート、該チューブシートに支持される伝熱管群、および前記胴管の両端部に配設される第２熱交換流体入口および出口が設けられた端部キャップが、それぞれろう付けもしくは溶接にて一体化された構造の多管式熱交換器において、前記伝熱管の少なくとも片端の内端面および外端面がチューブシートにろう付けされ、かつそのろう付け構造は、チューブシートが厚肉の場合は当該チューブシートに伝熱管の外径より大きい貫通孔を穿設し、該貫通孔に伝熱管の端部を挿入した状態でチューブシートの内面および外面にサポートプレートを介してろう付けして構成したことを特徴とする多管式熱交換器。A barrel tube provided with a first heat exchange fluid inlet and outlet at both ends, a tube sheet provided near both ends of the inner wall of the barrel tube, a heat transfer tube group supported by the tube sheet, and both ends of the barrel tube In a multi-tube heat exchanger having a structure in which end caps provided with a second heat exchange fluid inlet and an outlet disposed in the unit are respectively integrated by brazing or welding, at least one end of the heat transfer tube The inner end surface and the outer end surface of the tube sheet are brazed to the tube sheet, and when the tube sheet is thick, a through hole larger than the outer diameter of the heat transfer tube is formed in the tube sheet. A multi-tube heat exchanger characterized in that it is constructed by brazing the inner and outer surfaces of the tube sheet via a support plate with the end of the heat transfer tube inserted into the tube sheet.
JP2000350752A 2000-11-17 2000-11-17 Multi-tube heat exchanger Expired - Fee Related JP4646383B2 (en)

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JP2004322117A (en) * 2003-04-22 2004-11-18 Usui Kokusai Sangyo Kaisha Ltd Brazing method by continuous brazing furnace
CN101680727A (en) * 2006-12-26 2010-03-24 开利公司 Heat exchanger design for improved performance and manufacturability
SE532900C2 (en) * 2008-03-31 2010-05-04 Titanx Engine Cooling Holding Heat exchanger including end plate.
JP5625545B2 (en) * 2010-06-29 2014-11-19 株式会社Ihi Pipe end weld repair structure and pipe end weld repair method
CN102570696A (en) * 2012-03-20 2012-07-11 中科盛创（青岛）电气有限公司 Expansion tube type water-cooling base for motor
DK177774B1 (en) 2013-04-11 2014-06-23 Spx Flow Technology Danmark As HYGIENIC HEAT EXCHANGE AND METHOD FOR PREPARING A HYGIENIC HEAT EXCHANGE
KR102077565B1 (en) * 2013-07-02 2020-02-14 엘지전자 주식회사 Shell and tube type heat exchanger and Manufacturing method of the same
JP6023670B2 (en) * 2013-07-25 2016-11-09 株式会社ユタカ技研 Heat exchanger and heat exchange device
JP6904154B2 (en) * 2017-08-09 2021-07-14 三共ラヂエーター株式会社 Heat exchanger

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