JP4574535B2 - Manufacturing method of latent heat recovery type heat exchanger. - Google Patents

Manufacturing method of latent heat recovery type heat exchanger. Download PDF

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JP4574535B2
JP4574535B2 JP2005363621A JP2005363621A JP4574535B2 JP 4574535 B2 JP4574535 B2 JP 4574535B2 JP 2005363621 A JP2005363621 A JP 2005363621A JP 2005363621 A JP2005363621 A JP 2005363621A JP 4574535 B2 JP4574535 B2 JP 4574535B2
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header
plate
heat exchanger
body plate
bent edge
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JP2007163096A (en
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真一 後藤
英克 成瀬
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Rinnai Corp
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Rinnai Corp
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Priority to KR1020060064840A priority patent/KR100725009B1/en
Priority to CN2006101416556A priority patent/CN1981983B/en
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    • 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
    • F28D7/08—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 otherwise bent, e.g. in a serpentine or zig-zag
    • F28D7/082—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 otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/04—Fastening; Joining by brazing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Fluid Heaters (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
  • Heat Treatment Of Articles (AREA)

Description

本発明は、燃焼排気中の水蒸気を凝縮させて潜熱を回収するようにした潜熱回収型熱交換器の製造方法に関する。   The present invention relates to a method of manufacturing a latent heat recovery type heat exchanger that recovers latent heat by condensing water vapor in combustion exhaust gas.

従来、この種の潜熱回収型熱交換器として、燃焼排気が流れる胴部内に蛇行形状の吸熱管を複数本配置し、これら吸熱管の一端部と他端部とを夫々流入ヘッダと流出ヘッダとに接続して、流入ヘッダから流出ヘッダにこれら吸熱管を介して被加熱流体を流し、燃焼排気中の水蒸気を吸熱管の外面で凝縮させて潜熱を回収するようにしたものは知られている(例えば、特許文献１参照)。   Conventionally, as this type of latent heat recovery type heat exchanger, a plurality of meandering endothermic tubes are arranged in a body portion through which combustion exhaust flows, and one end portion and the other end portion of these endothermic tubes are respectively connected to an inflow header and an outflow header. It is known that a fluid to be heated flows from the inflow header to the outflow header via these heat absorption tubes, and the water vapor in the combustion exhaust is condensed on the outer surface of the heat absorption tubes to recover latent heat. (For example, refer to Patent Document 1).

このものでは、各ヘッダを鋳物製として、各ヘッダに吸熱管用の筒状の差込み口を形成し、吸熱管の各端部をその外周にＯリングを装着した状態で各ヘッダの差込み口に挿入して、止め具により抜け止めしている。然し、これでは、Ｏリングや止め具が必要になって部品点数が増し、コストが高くなる不具合がある。
特開２００４−２７１１０９号公報 In this structure, each header is made of casting, and each header is formed with a cylindrical insertion port for an endothermic tube, and each end of the endothermic tube is inserted into the insertion port of each header with an O-ring attached to the outer periphery thereof. The stopper is used to prevent it from coming off. However, this requires an O-ring and a stopper, increasing the number of parts and increasing the cost.
JP 2004-271109 A

ところで、凝縮型熱交換器では、燃焼排気中の酸化物の溶け込みで強酸性になる凝縮水による吸熱管の腐食を防止するため、吸熱管を一般的な熱交換器で用いる銅管ではなく、ステンレス等の耐食性金属で形成している。然し、このような吸熱管を蛇行形状に曲げ加工したままでは、残留応力により応力腐食割れを生ずる可能性がある。そのため、吸熱管の曲げ加工後に熱処理(固溶化処理)を施して、残留応力を除去することが必要になる。   By the way, in the condensation heat exchanger, in order to prevent corrosion of the heat absorption tube due to condensed water that becomes strongly acidic due to the dissolution of oxides in the combustion exhaust, the heat absorption tube is not a copper tube used in a general heat exchanger, It is made of corrosion resistant metal such as stainless steel. However, if such an endothermic tube is bent into a meandering shape, stress corrosion cracking may occur due to residual stress. Therefore, it is necessary to remove the residual stress by performing a heat treatment (solution treatment) after the endothermic tube is bent.

本発明は、蛇行形状の吸熱管の熱処理の必要性に着目し、可及的低コストで凝縮型熱交換器を製造できるようにした方法を提供することをその課題としている。   An object of the present invention is to provide a method capable of manufacturing a condensing heat exchanger at as low a cost as possible by paying attention to the necessity of heat treatment of a meandering endothermic tube.

上記課題を解決するために、本発明は、燃焼排気が流れる胴部内に蛇行形状の吸熱管を複数本配置し、これら吸熱管の一端部と他端部とを夫々流入ヘッダと流出ヘッダとに接続して、流入ヘッダから流出ヘッダにこれら吸熱管を介して被加熱流体を流し、燃焼排気中の水蒸気を吸熱管の外面で凝縮させて潜熱を回収するようにした潜熱回収型熱交換器の製造方法において、蛇行形状に曲げ加工された複数本の吸熱管の一端部と他端部とを夫々流入ヘッダと流出ヘッダとに差し込んでサブアッセンブリーを組立てる工程と、サブアッセンブリーを加熱炉に投入して、これら吸熱管の各端部を各ヘッダにロー付けする炉中ロー付け工程とを備え、炉中ロー付け工程で吸熱管に残留応力を除去する熱処理が施されるようにし、各ヘッダは、吸熱管用の差込み口を開設した本体板と、本体板との間に閉鎖空間を画成する蓋板とで構成され、本体板から蓋板に向かう方向を横方向外方として、本体板の周囲と蓋板の周囲とに互いに横方向外方に斜めに屈曲する曲げ縁部を形成し、本体板の曲げ縁部と蓋板の曲げ縁部とを重ね合わせた状態でロー付けして各ヘッダを製造すると共に、各ヘッダの本体板の曲げ縁部の先端に、横方向に直交する方向に屈曲する取付け部を形成して、各ヘッダを取付け部において胴部の側板に取付けることを特徴とする。 In order to solve the above-described problems, the present invention has a plurality of meandering endothermic tubes arranged in a body portion through which combustion exhaust flows, and one end portion and the other end portion of these endothermic tubes are respectively used as an inflow header and an outflow header. A latent heat recovery type heat exchanger that connects and flows a heated fluid from the inflow header to the outflow header via these heat absorption tubes and condenses the water vapor in the combustion exhaust on the outer surface of the heat absorption tubes to recover the latent heat. In the manufacturing method, a step of assembling the subassembly by inserting one end portion and the other end portion of the plurality of endothermic tubes bent into a meandering shape into the inflow header and the outflow header, and putting the subassembly into the heating furnace. Te, each end of the heat absorbing tubes as a brazed to furnace brazing process to each header, a heat treatment to remove residual stress in the heat absorbing tube furnace brazing process is performed, each header For endothermic tubes It is composed of a main plate that has an insertion port and a lid plate that defines a closed space between the main plate and the periphery of the main plate and the lid plate with the direction from the main plate to the lid plate being laterally outward. A bent edge that bends obliquely outward in the lateral direction is formed around the outer periphery of the frame, and brazed in a state where the bent edge of the main body plate and the bent edge of the lid plate are overlapped to manufacture each header. At the same time, an attachment part that bends in a direction perpendicular to the lateral direction is formed at the end of the bending edge of the main body plate of each header, and each header is attached to the side plate of the body part at the attachment part .

本発明によれば、吸熱管の各端部を各ヘッダにロー付けするため、従来のようなＯリングや止め具が不要になり、部品点数が削減される。また、炉中ロー付け工程で吸熱管が熱処理されて、残留応力が除去される。そのため、吸熱管に別途熱処理を施す必要がなく、部品点数の削減と相俟って、凝縮型熱交換器の製造コストを可及的に低減できる。   According to the present invention, since each end of the heat absorption tube is brazed to each header, an O-ring and a stopper as in the related art become unnecessary, and the number of parts is reduced. Further, the endothermic tube is heat-treated in the in-furnace brazing process to remove the residual stress. Therefore, it is not necessary to separately heat-treat the endothermic tube, and coupled with the reduction in the number of parts, the manufacturing cost of the condensation heat exchanger can be reduced as much as possible.

ところで、流入ヘッダ及び流出ヘッダの軽量化と低コスト化のためには、各ヘッダを吸熱管の各端部の差込み口を開設した本体板と、本体板との間に閉鎖空間を画成する蓋板とで構成される板金製とすることが望まれる。この場合、一般的には、本体板の周囲と蓋板の周囲とに平面状のフランジ部を形成し、本体板のフランジ部と蓋板のフランジ部とを重ね合わせた状態でロー付けして各ヘッダを製造することが考えられる。ここで、本体板と蓋板との結合強度を確保するにはフランジ部をある程度幅広にする必要があり、この幅広のフランジ部がヘッダの外側に張り出して、ヘッダが大型化する。   By the way, in order to reduce the weight and cost of the inflow header and the outflow header, a closed space is defined between the main body plate and the main body plate in which each header is provided with an insertion port at each end of the heat absorption pipe. It is desirable to use a sheet metal made up of a cover plate. In this case, in general, a flat flange portion is formed around the main body plate and the periphery of the cover plate, and the flange portion of the main body plate and the flange portion of the cover plate are overlapped and brazed. It is conceivable to manufacture each header. Here, in order to secure the coupling strength between the main body plate and the cover plate, the flange portion needs to be widened to some extent, and the wide flange portion projects to the outside of the header, thereby increasing the size of the header.

これに対し、本体板の周囲に蓋板側に直角に屈曲する曲げ縁部を形成すると共に、蓋板の周囲に本体板側に直角に屈曲する曲げ縁部を形成し、本体板と蓋板とを両者の曲げ縁部において嵌合させて、曲げ縁部同士をロー付けすれば、ヘッダの外側にフランジ部が張り出さず、ヘッダの小型化を図ることができる。然し、この場合には、本体板と蓋板との結合強度を確保する上で、両者の曲げ縁部間のクリアランスをできるだけ小さくすることが必要になり、曲げ縁部同士の干渉で本体板と蓋板との組み合わせ作業がしにくくなる。   On the other hand, a bent edge that bends at right angles to the cover plate side is formed around the main body plate, and a bent edge portion that bends at right angles to the main body plate side is formed around the cover plate. Are fitted to each other at the bent edges, and the bent edges are brazed to each other, so that the flange portion does not protrude to the outside of the header, and the header can be reduced in size. However, in this case, in order to secure the bonding strength between the main body plate and the lid plate, it is necessary to make the clearance between the bent edges as small as possible. The combination work with the cover plate becomes difficult.

上記の不具合を解消するには、本体板の周囲と蓋板の周囲とに互いに同一方向に斜めに屈曲する曲げ縁部を形成し、本体板の曲げ縁部と蓋板の曲げ縁部とを重ね合わせた状態でロー付けして各ヘッダを製造することが望ましい。即ち、これによれば、本体板と蓋板とを曲げ縁部同士の干渉を生ずることなく容易に組合せることができ、また、曲げ縁部は平面状のフランジ部に比しヘッダ外側への張り出し量が小さく、ヘッダの小型化を図ることもできる。   In order to solve the above problems, a bent edge that bends obliquely in the same direction is formed around the body plate and the cover plate, and the bent edge of the body plate and the bent edge of the cover plate are formed. It is desirable to manufacture each header by brazing in a superposed state. That is, according to this, the main body plate and the cover plate can be easily combined without causing interference between the bending edges, and the bending edge is more outward than the flat flange portion. The amount of overhang is small, and the header can be downsized.

尚、サブアッセンブリーの組立て前に、本体板の曲げ縁部と蓋板の曲げ縁部とをロー付けしておくことも可能であるが、本体板の曲げ縁部と蓋板の曲げ縁部とのロー付けを上記炉中ロー付け工程で行うようにすれば、製造コストの一層の削減を図ることができる。   Before assembling the sub-assembly, it is possible to braze the bent edge of the main body plate and the bent edge of the cover plate, but the bent edge of the main body plate and the bent edge of the cover plate If the brazing is performed in the above-described in-furnace brazing process, the manufacturing cost can be further reduced.

図１を参照して、１は給湯器の外装ケースであり、外装ケース１内に、バーナ(図示せず)を内蔵する燃焼筐２と、燃焼筐２の上方の主熱交換器３と、主熱交換器３の上方の副熱交換器４とを配置している。また、燃焼筐２の下側には、燃焼筐２内に燃焼用空気を供給する燃焼ファン５が配置されている。   Referring to FIG. 1, reference numeral 1 denotes an outer case of a water heater, and a combustion housing 2 containing a burner (not shown) in the outer case 1, a main heat exchanger 3 above the combustion housing 2, A sub heat exchanger 4 above the main heat exchanger 3 is arranged. A combustion fan 5 that supplies combustion air into the combustion housing 2 is disposed below the combustion housing 2.

主熱交換器３は、バーナの燃焼排気が流れる胴部３０内に前後方向(図１の紙面垂直方向)の隙間を存して積層した多数の吸熱フィン(図示せず)と、これら吸熱フィンを貫通する前後方向に長手の複数本の吸熱管３１とを備えている。そして、胴部３０の前後の板の外面において、図１、図２に示す如く、主熱交換器３の吸熱管３１を２本宛Ｕベント３２を介して接続し、上流端の吸熱管３１−Ｓから下流端の吸熱管３１−Ｅに至る一連の熱交換水路を構成している。主熱交換器３の上流端の吸熱管３１―Ｓには副熱交換器４を介して給水管Ｋ１が接続され、下流端の吸熱管３１―Ｅには出湯管Ｋ２が接続されている。そして、出湯管Ｋ２の下流端の出湯栓(図示せず)が開かれて副熱交換器４及び主熱交換器３に通水されたとき、バーナに点火されて、副熱交換器４及び主熱交換器３で加熱された温水が出湯栓から出湯されるようにしている。   The main heat exchanger 3 includes a large number of heat absorbing fins (not shown) stacked in the body portion 30 through which the burner combustion exhaust flows with gaps in the front-rear direction (perpendicular to the plane of FIG. 1), and these heat absorbing fins. And a plurality of longitudinal heat-absorbing tubes 31 in the front-rear direction. As shown in FIGS. 1 and 2, two endothermic pipes 31 of the main heat exchanger 3 are connected via two U-bents 32 on the outer surfaces of the plates before and after the body part 30, and the upstream endothermic pipe 31. -S constitutes a series of heat exchange channels from the downstream end heat absorption pipe 31-E. A water supply pipe K1 is connected to the heat absorption pipe 31-S at the upstream end of the main heat exchanger 3 via the sub heat exchanger 4, and a tapping pipe K2 is connected to the heat absorption pipe 31-E at the downstream end. When the outlet tap (not shown) at the downstream end of the outlet pipe K2 is opened and passed through the auxiliary heat exchanger 4 and the main heat exchanger 3, the burner is ignited and the auxiliary heat exchanger 4 and The hot water heated by the main heat exchanger 3 is discharged from the tap.

副熱交換器４は潜熱回収型熱交換器であり、図２、図３に示す如く、胴部４０内に配置した蛇行形状の複数本(本実施形態では６本)の吸熱管４１を備えている。胴部４０は後上がりに傾斜する底板部４０１を有しており、底板部４０１の後部に排気導入口４０２が開設されている。そして、主熱交換器３を通過したバーナの燃焼排気が主熱交換器３上の排気フード３３を介して排気導入口４０２から胴部４０内に流入するようにしている。また、胴部４０の前面には排気排出口４０３が設けられており、胴部４０内に排気排出口４０３に向けて燃焼排気が流れる。   The auxiliary heat exchanger 4 is a latent heat recovery type heat exchanger, and includes a plurality of meandering-shaped (six in this embodiment) heat absorption tubes 41 arranged in the body 40 as shown in FIGS. ing. The body portion 40 has a bottom plate portion 401 that inclines rearward, and an exhaust inlet 402 is formed at the rear portion of the bottom plate portion 401. The burner combustion exhaust gas that has passed through the main heat exchanger 3 flows into the trunk portion 40 from the exhaust inlet 402 via the exhaust hood 33 on the main heat exchanger 3. Further, an exhaust discharge port 403 is provided on the front surface of the body portion 40, and combustion exhaust gas flows in the body portion 40 toward the exhaust discharge port 403.

胴部４０の横方向一側の側板４０４の内面には、複数本の吸熱管４１の一端部を接続する前側の流入ヘッダ４２１と、これら吸熱管４１の他端部を接続する後側の流出ヘッダ４２２とが取り付けられている。そして、流入ヘッダ４２１に給水管Ｋ１を接続すると共に、流出ヘッダ４２２に、主熱交換器３の上流端の吸熱管３１−Ｓに連なる接続管Ｋ３を接続している。出湯栓を開くと、流入ヘッド４２１から流出ヘッド４２２に複数本の吸熱管４１を介して被加熱流体たる水が流れ、燃焼排気中の水蒸気が吸熱管４１の外面で凝縮して、潜熱が回収される。かくして、潜熱により予熱された水が副熱交換器４から主熱交換器３に供給される。 The inner surface of the lateral one side of the side plate 404 of the barrel 40, the front side of the inlet header 42 1 connecting the one end of the heat absorbing tube 41 of the plurality of rear connecting the other end portion of the heat absorbing tube 41 and an outlet header 42 2 is attached. Then, the connecting water supply pipe K1 to the inlet header 42 1, the outflow header 42 2 connects the connection tube K3 connecting to the heat absorbing tube 31-S of the main heat exchanger 3 at the upstream end. When opening the hot water tap, serving heated fluid water flows through the heat absorbing tube 41 a plurality of the inlet head 42 1 to the outlet head 42 2, water vapor in the flue gas condenses at the outer surface of the heat absorbing tube 41, the latent heat Is recovered. Thus, the water preheated by the latent heat is supplied from the auxiliary heat exchanger 4 to the main heat exchanger 3.

吸熱管４１は、耐食性金属、例えば、ステンレス製のコルゲート管を蛇行形状に曲げ加工して形成される。ここで、ステンレス製の管を曲げ加工したままでは、応力が残留して、残留応力による応力腐食割れを生ずる可能性があるため、熱処理(固溶化処理)で残留応力を除去する必要がある。   The endothermic tube 41 is formed by bending a corrosion-resistant metal, for example, a stainless corrugated tube into a meandering shape. Here, if the stainless steel tube is bent, stress remains and stress corrosion cracking due to the residual stress may occur. Therefore, it is necessary to remove the residual stress by heat treatment (solution treatment).

また、流入ヘッダ４２１と流出ヘッダ４２２は、軽量化と低コスト化のため、共に板金製としている。これを詳述するに、各ヘッダ４２１，４２２は、図４、図５に示す如く、ステンレス製の本体板４２１と、本体板４２１との間に閉鎖空間を画成するステンレス製の蓋板４２２とで構成されている。本体板４２１には、吸熱管４１用の差込み口４２３が複数本の吸熱管４１に対応して複数開設され、蓋板４２２には、給水管Ｋ１や接続管Ｋ３用の単一のジョイント部４２４が設けられている。そして、本体板４２１の周囲と蓋板４２２の周囲とに互いに同一方向に斜めに屈曲する曲げ縁部４２１ａ，４２２ａを形成し、本体板４２１の曲げ縁部４２１ａと蓋板４２２の曲げ縁部４２２ａとを重ね合わせた状態でロー付けして各ヘッダ４２１，４２２を製造している。 Further, the inflow header 42 1 and the outflow header 42 2, for reducing the weight and cost, are both made of sheet metal. To detail this, each header 42 1, 42 2, 4, as shown in FIG. 5, a stainless steel body plate 421, a stainless steel lid to define a closed space between the body plate 421 It consists of a plate 422. The main body plate 421 has a plurality of insertion ports 423 for the heat absorption tubes 41 corresponding to the plurality of heat absorption tubes 41, and the lid plate 422 has a single joint portion 424 for the water supply pipe K1 and the connection pipe K3. Is provided. Then, bent edges 421a and 422a that are obliquely bent in the same direction are formed around the body plate 421 and the cover plate 422, and the bent edge 421a of the body plate 421 and the bent edge 422a of the cover plate 422 are formed. The headers 42 1 and 42 2 are manufactured by brazing in a state where they are superimposed.

尚、本実施形態では、本体板４２１から蓋板４２２に向かう方向を横方向外方として、本体板４２１と蓋板４２２との両者の曲げ縁部４２１ａ，４２２ａを横方向外方に屈曲させている。そして、胴部４０の側板４０４に対する各ヘッダ４２１，４２２の取付け部４２５を本体板４２１の曲げ縁部４２１ａの先端に横方向に直交する方向に屈曲させて形成している。また、本実施形態で流入ヘッダ４２１と流出ヘッダ４２２とは上下反転しているだけで全く同一である。 In this embodiment, the direction from the main body plate 421 toward the lid plate 422 is laterally outward, and the bending edge portions 421a and 422a of both the main body plate 421 and the lid plate 422 are bent laterally outward. Yes. Then, it is formed by bending in the direction perpendicular to the mounting portion 425 of each header 42 1, 42 2 for the side plate 404 of the body portion 40 in the transverse direction to the tip of the bending edge 421a of the main plate 421. Also, the inlet header 42 1 in the present embodiment and the outflow header 42 2 is identical with only upside down.

ところで、本体板４２１と蓋板４２２とを両者の周囲に形成した平面状のフランジ部において重ね合わせてロー付けすることも考えられるが、これでは、フランジ部がヘッダ４２１，４２２の外側に大きく張り出して、ヘッダ４２１，４２２が大型化する。また、本体板４２１の周囲に蓋板４２２側に直角に屈曲する曲げ縁部を形成すると共に、蓋板４２２の周囲に本体板４２１側に直角に屈曲する曲げ縁部を形成し、本体板４２１と蓋板４２２の両者の曲げ縁部同士を嵌合させてロー付けすることも考えられる。然し、この場合には、本体板４２１と蓋板４２２との結合強度を確保する上で、両者の曲げ縁部間のクリアランスをできるだけ小さくすることが必要になり、曲げ縁部同士の干渉で本体板４２１と蓋板４２２との組み合わせ作業がしにくくなる。これに対し、本実施形態では、本体板４２１と蓋板４２２とを両者の曲げ縁部４２１ａ，４２２ａ同士の干渉を生ずることなく容易に組合せることができるため、作業性が良くなり、且つ、曲げ縁部４２１ａ，４２２ａは平面状のフランジ部に比しヘッダ４２１，４２２の外側への張り出し量が小さく、ヘッダ４２１，４２２の小型化を図ることもできる。 Meanwhile, a body plate 421 and cover plate 422 it is considered that by superposing the planar flange portion formed around the both are brazed, which in the flange portion on the outer side of the header 42 1, 42 2 overhanging large, the header 42 1, 42 2 is increased in size. In addition, a bent edge that is bent at a right angle toward the lid plate 422 is formed around the main body plate 421, and a bent edge that is bent at a right angle toward the main body plate 421 is formed around the cover plate 422. It is also conceivable that the bent edges of both the cover plate 422 and the cover plate 422 are fitted and brazed. However, in this case, in order to secure the coupling strength between the main body plate 421 and the lid plate 422, it is necessary to make the clearance between the two bent edges as small as possible. The combination work of the plate 421 and the cover plate 422 becomes difficult. On the other hand, in the present embodiment, the main body plate 421 and the lid plate 422 can be easily combined without causing interference between the bent edge portions 421a and 422a, so that workability is improved, and bent edge 421a, 422a header 42 1 relative to the planar flange 42 projecting amount is small 2 to the outside, it is also possible to header 42 1, 42 2 of the compact.

副熱交換器４の製造に際しては、先ず、蛇行形状に曲げ加工された熱処理前の複数本の吸熱管４１の一端部と他端部とをその外面にロー材(ペースト状のニッケルロー材等)を塗布した状態で流入ヘッダ４２１と流出ヘッダ４２２の本体板４２１の差込み口４２３に差し込む。次に、各ヘッダ４２１，４２２の本体板４２１に蓋板４２２を両者の曲げ縁部４２１ａ，４２２ａ同士が重なり合うように組合せ、図６に示すサブアッセンブリーを組立てる。この際、本体板４２１の曲げ縁部４２１ａと蓋板４２２の曲げ縁部４２２ａとの少なくとも一方に予めロー材を塗布しておく。 When the auxiliary heat exchanger 4 is manufactured, first, one end portion and the other end portion of the plurality of heat absorption tubes 41 bent into a meandering shape before heat treatment are placed on the outer surface thereof with a brazing material (such as a paste-like nickel brazing material). ) in coated state inserted into receptacle 423 of the inflow header 42 1 and the outflow header 42 and second main plate 421. Next, each header 42 1, 42 2 of the main plate 421 in cover plate 422 both bending edge 421a, combined so as to overlap to each other 422a, assembling the sub-assembly shown in FIG. At this time, a brazing material is previously applied to at least one of the bent edge portion 421a of the main body plate 421 and the bent edge portion 422a of the cover plate 422.

次に、サブアッセンブリーを加熱炉(図示せず)に投入し、炉中ロー付け処理を行う。これにより複数本の吸熱管４１の一端部と他端部とが夫々流入ヘッダ４２１と流出ヘッダ４２２とにロー付けされると共に、各ヘッダ４２１，４２２の本体板４２１と蓋板４２２とがロー付けされる。更に、炉中ロー付け処理中に吸熱管４１が熱処理(固溶化処理)され、吸熱管４１の残留応力が除去される。 Next, the subassembly is put into a heating furnace (not shown), and brazing in the furnace is performed. Thus with one end and the other end of the plurality of heat absorbing tubes 41 are brazed to the respective inlet header 42 1 and outlet header 42 2, each header 42 1, 42 2 of the main plate 421 and the cover plate 422 And are attached. Further, the endothermic tube 41 is heat treated (solution treatment) during the brazing process in the furnace, and the residual stress of the endothermic tube 41 is removed.

炉中ロー付け処理後は、サブアッセンブリーを流入ヘッダ４２１及び流出ヘッダ４２２の取付け部４２５において側板４０４に取り付ける。この際、各ヘッダ４２１，４２２のジョイント部４２４が側板４０４を通してその外面に突出する。最後に、側板４０４を胴部４０の一側面に取付けて、吸熱管４１を胴部４０に収納する。 Furnace after brazing process, attached to the side plate 404 of subassembly in the mounting portion 425 of the inlet header 42 1 and outlet header 42 2. In this case, the joint portion 424 of each header 42 1, 42 2 projects on its outer surface through the side plate 404. Finally, the side plate 404 is attached to one side surface of the body portion 40, and the heat absorption tube 41 is accommodated in the body portion 40.

以上の方法で副熱交換器４を製造すれば、各吸熱管４１をＯリング及び止め具を用いずに各ヘッダ４２１，４２２に接続でき、部品点数を削減できる。しかも、吸熱管４１に残留応力を除去するための熱処理を別途施さずに済み、部品点数の削減と相俟って、副熱交換器４の製造コストを可及的に低減できる。 If production of secondary heat exchanger 4 by the above method, each heat absorbing tube 41 O-ring and stop without using to connect to each header 42 1, 42 2, the number of parts can be reduced. Moreover, it is not necessary to separately perform a heat treatment for removing the residual stress on the heat absorption tube 41, and the manufacturing cost of the auxiliary heat exchanger 4 can be reduced as much as possible together with the reduction in the number of parts.

尚、サブアッセンブリーの組立て前に、各ヘッダ４２１，４２２の本体板４２１と蓋板４２２とをロー付けして、各ヘッダ４２１，４２２を製造しておくことも可能であるが、サブアッセンブリーの炉中ロー付け工程で本体板４２１と蓋板４２２とをロー付けした方がコスト的に有利である。 Incidentally, prior to assembly of the sub-assembly, a body plate 421 and cover plate 422 of each header 42 1, 42 2 and brazing, it is possible to keep production of each header 42 1, 42 2, It is advantageous in terms of cost to braze the main body plate 421 and the lid plate 422 in the in-furnace brazing step of the subassembly.

以上、本発明の実施形態について図面を参照して説明したが、本発明はこれに限定されない。例えば、上記実施形態では、給湯器の副熱交換器４から成る潜熱回収型熱交換器の製造に本発明を適用しているが、給湯器以外で使用する潜熱回収型熱交換器の製造にも同様に本発明を適用できる。 As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above SL embodiment, the present invention is applied to the production of latent heat recovery type heat exchanger comprising a secondary heat exchanger 4 of the water heater, the production of latent heat recovery type heat exchanger for use in a non-water heater Similarly, the present invention can be applied.

本発明方法で製造された潜熱回収型熱交換器から成る副熱交換器を具備する給湯器の正面図。The front view of the water heater provided with the auxiliary heat exchanger which consists of a latent heat recovery type heat exchanger manufactured by the method of the present invention. 図１のＩＩ−ＩＩ線で切断した切断側面図。FIG. 2 is a cut side view taken along line II-II in FIG. 1. 図２のＩＩＩ−ＩＩＩ線で切断した切断平面図。The cutting top view cut | disconnected by the III-III line | wire of FIG. 図１の副熱交換器に設けられた流入ヘッダの分解状態の斜視図。The perspective view of the decomposition | disassembly state of the inflow header provided in the auxiliary heat exchanger of FIG. 図４の流入ヘッダの組立て状態の縦断面図。The longitudinal cross-sectional view of the assembly state of the inflow header of FIG. 図１の副熱交換器のサブアッセンブリーの組立て状態を示す斜視図。The perspective view which shows the assembly state of the subassembly of the sub heat exchanger of FIG.

符号の説明Explanation of symbols

４…副熱交換器(潜熱回収型熱交換器)、４０…胴部、４１…吸熱管、４２１…流入ヘッダ、４２２…流出ヘッダ、４２１…本体板、４２２…蓋板、４２１ａ，４２２ａ…曲げ縁部、４２３…差込み口。 4 ... auxiliary heat exchanger (latent heat recovery type heat exchanger), 40 ... body portion, 41 ... heat absorbing tube, 42 1 ... inlet header 42 2 ... outlet header, 421 ... main plate, 422 ... cover plate, 421a, 422a ... bending edges, 423 ... inserts.

Claims (2)

燃焼排気が流れる胴部内に蛇行形状の吸熱管を複数本配置し、これら吸熱管の一端部と他端部とを夫々流入ヘッダと流出ヘッダとに接続して、流入ヘッダから流出ヘッダにこれら吸熱管を介して被加熱流体を流し、燃焼排気中の水蒸気を吸熱管の外面で凝縮させて潜熱を回収するようにした潜熱回収型熱交換器の製造方法において、
蛇行形状に曲げ加工された複数本の吸熱管の一端部と他端部とを夫々流入ヘッダと流出ヘッダとに差し込んでサブアッセンブリーを組立てる工程と、
サブアッセンブリーを加熱炉に投入して、これら吸熱管の各端部を各ヘッダにロー付けする炉中ロー付け工程とを備え、
炉中ロー付け工程で吸熱管に残留応力を除去する熱処理が施されるようにし、
各ヘッダは、吸熱管用の差込み口を開設した本体板と、本体板との間に閉鎖空間を画成する蓋板とで構成され、本体板から蓋板に向かう方向を横方向外方として、本体板の周囲と蓋板の周囲とに互いに横方向外方に斜めに屈曲する曲げ縁部を形成し、本体板の曲げ縁部と蓋板の曲げ縁部とを重ね合わせた状態でロー付けして各ヘッダを製造すると共に、
各ヘッダの本体板の曲げ縁部の先端に、横方向に直交する方向に屈曲する取付け部を形成して、各ヘッダを取付け部において胴部の側板に取付けることを特徴とする潜熱回収型熱交換器の製造方法。 A plurality of meandering endothermic tubes are arranged in the body part through which the combustion exhaust flows, and one end and the other end of the endothermic tubes are connected to the inflow header and the outflow header, respectively. In the manufacturing method of a latent heat recovery type heat exchanger in which a fluid to be heated is flowed through a pipe and water vapor in the combustion exhaust is condensed on the outer surface of the heat absorption pipe to recover latent heat.
A step of assembling a subassembly by inserting one end portion and the other end portion of a plurality of endothermic tubes bent into a meandering shape into an inflow header and an outflow header, respectively;
In-furnace brazing step of putting the subassembly into the heating furnace and brazing each end of these heat absorption tubes to each header,
In the furnace brazing process, heat absorption tube is subjected to heat treatment to remove residual stress ,
Each header is composed of a main body plate having an insertion port for an endothermic tube, and a lid plate that defines a closed space between the main body plate, and the direction from the main body plate to the lid plate is laterally outward, A bent edge that bends obliquely outward in the lateral direction is formed around the body plate and the cover plate, and brazed with the bent edge of the body plate and the bent edge of the cover plate overlapped As each header is manufactured,
A latent heat recovery type heat characterized by forming an attachment portion that bends in a direction perpendicular to the transverse direction at the tip of the bent edge portion of the body plate of each header, and attaching each header to the side plate of the trunk portion at the attachment portion. Exchanger manufacturing method. 前記本体板の曲げ縁部と前記蓋板の曲げ縁部とのロー付けは前記炉中ロー付け工程で行われることを特徴とする請求項１記載の潜熱回収型熱交換器の製造方法。 Method for producing a latent heat recovery type heat exchanger according to claim 1, wherein the brazing of the bent edge of the cover plate and the bending edge of the body plate is characterized by being carried out in the furnace brazing process.
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