JP3703645B2 - Water heater heat exchanger - Google Patents

Water heater heat exchanger Download PDF

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Publication number
JP3703645B2
JP3703645B2 JP03313399A JP3313399A JP3703645B2 JP 3703645 B2 JP3703645 B2 JP 3703645B2 JP 03313399 A JP03313399 A JP 03313399A JP 3313399 A JP3313399 A JP 3313399A JP 3703645 B2 JP3703645 B2 JP 3703645B2
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water supply
supply pipe
water
pipe
wound
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JP2000234805A (en
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明 熊谷
力 柘植
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Rinnai Corp
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Rinnai Corp
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Priority to KR1019990060854A priority patent/KR100345350B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/146—Connecting elements of a heat exchanger
    • 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
    • B21D53/04—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/06—Arrangement of mountings or supports for heaters, e.g. boilers, other than space heating radiators

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (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)

Description

【０００１】
【発明の属する技術分野】
本発明は、供給された水を加熱して湯を生成する給湯器の熱交換器に関する。
【０００２】
【従来の技術】
給湯器の熱交換器は、方形筒状の缶体内にフィンを一体に備える吸熱水管が収納されている。該缶体は、開放された下端部がバーナ等の燃焼装置に連結されて燃焼排気を吸熱水管のフィンに向かって導入するために、その大略下半部に燃焼排気の導入空間である燃焼室が形成されている。前記吸熱水管は該燃焼室の上部に水平方向に蛇行して設けられ、その上流端に給水管が接続され、下流端に出湯管が接続されている。
【０００３】
この種の熱交換器においては、前記燃焼室の外壁を形成する部位の缶体が過剰に高温となることを防止するために、当該缶体の外周に給水管を接触させて複数回巻回することにより、前記缶体を冷却することが行われている。
【０００４】
ところで、近年、比較的低い温度の炎を形成してＮＯｘの発生を抑えると共に小型化されたバーナを採用した給湯器が知られている。この種の給湯器においては、バーナの小型化に伴って熱交換器の燃焼室の高さ寸法も小とされているため、缶体の燃焼室の周りに給水管を接触させて一回巻回するだけで、缶体の高温上昇を十分に抑えることが可能となっている。
【０００５】
一方、この種の熱交換器においては、熱交換効率の高い吸熱水管の配列が形成されている。即ち、図４（ａ）に縦断面視して示すように、熱交換器５０は、フィン５１の下半部に貫通して設けられた複数列の下段吸熱水管５２と、フィン５１の上半部に貫通して設けられた複数列の上段吸熱水管５３とを備えている。そして、各下段吸熱水管５２の間を経て上昇する燃焼排気を各上段吸熱水管５３に確実に当てるために、各下段吸熱水管５２の間の上方に各上段吸熱水管５３が位置するように交互に配列されている。このような配列によって各下段吸熱水管５２及び各上段吸熱水管５３を設けた場合には、図４（ｂ）に図４（ａ）を平面視して模式的に示すように、下段吸熱水管５２の上流端に仮想線示する缶体５４の一側壁５４ａを介して給水管５５が接続され、上段吸熱水管５３の下流端に他側壁５４ｂを介して出湯管５６が接続される。
【０００６】
そして更に、給水管５５と出湯管５６とは、図示しない給湯器本体内部において電気的な部品が使用されている制御部から離れた位置に配管することが好ましいために、給水管５５と出湯管５６とは共に缶体５４の同一側方に配管される。
【０００７】
以上のように、種々の条件を満たすように給水管５５を配設すると、図４（ａ）に示すように、冷却のために燃焼室５７に対応する位置の缶体５４に給水管５５を接触させて一回巻回させ、且つ、該給水管５５を出湯管５６と同一側方に配管する必要があるために、図４（ｂ）に模式的に示すように、缶体５４には給水管５５を一回半巻回させなければならない。
【０００８】
しかし、図４（ａ）に示すように、缶体５４に一回巻回した給水管５５ａは、缶体５４の表面温度が比較的高くなる燃焼室５７に対応する位置に設けられる反面、更に半回巻回した給水管５５ｂは、缶体５４の表面温度が比較的低くなる前記フィン５１の近傍に比較的長い距離に亘って当接されるために、当該位置の缶体５４の温度を一層低下させてしまい、缶体５４に結露が生じ、更には、この時の結露によって缶体５４に低温腐食が生じるおそれがある。
【０００９】
【発明が解決しようとする課題】
かかる不都合を解消して、本発明は、給水管による冷却効果を損なうことなく結露による缶体の腐食や損傷を確実に防止することができる給湯器の熱交換器を提供することを目的とする。
【００１０】
【課題を解決するための手段】
かかる目的を達成するために、本発明は、バーナの燃焼を行う燃焼室が大略下半部に形成された方形筒状の缶体と、該缶体の大略上半部に収納されたフィンを一体に備える吸熱水管と、該缶体の一側壁を貫通する前記吸熱水管の上流端に接続された給水管と、該缶体の他側壁を貫通する前記吸熱水管の下流端に接続された出湯管とを備え、前記燃焼室に対応する缶体の外周に前記給水管を巻回させた給湯器の熱交換器において、前記缶体の外周に巻回された前記給水管のうち、前記フィンの収納位置に近接して巻回された部分は前記缶体の外面から間隙を存して巻回され、前記缶体は、板状の金属製パネル材の端縁部同士を互いに重合して接合された接合部を介して筒状に形成され、該接合部は、前記缶体の外周に巻回された前記給水管が該缶体の外周に密着して巻回される位置において平坦に接合された平坦部と、該給水管が前記缶体の外面から間隙を存して巻回される位置において前記缶体の外方に突出形成され、該給水管に当接して前記間隙を維持する突出部とを備え、前記接合部は、前記パネル材の一端縁に沿って外側に折り返された外折り部と他端縁に沿って内側に折り返された内折り部とを互いに掛止させて圧着することにより形成され、前記平坦部は、前記内折り部の缶体の外方側を平坦とし且つ前記外折り部を缶体の内方側に突出させることにより形成され、前記突出部は、前記内折り部を缶体の外方側に突出させ且つ前記外折り部の缶体の内方側を平坦とすることにより形成されていることを特徴とする。
【００１１】
前記給水管は、前記燃焼室に対応する缶体の外周に巻回されていることにより、燃焼室に対応して比較的温度の高い部分の缶体を冷却し、該缶体の表面温度が過剰に高温となることが防止される。このとき、本発明においては、前記フィンの収納位置に近接して巻回されている給水管が前記間隙によって前記缶体の外面から離間されている。これにより、比較的温度の低い部分である前記フィンの収納位置の缶体には前記給水管が接触されないので、当該位置の缶体の表面温度が過剰に低下することがなく、缶体に結露が生じることが防止できると共に低温腐食による缶体の損傷を防止することができる。
【００１３】
また、本発明においては、前記缶体に形成されている前記接合部に前記平坦部と前記突出部とを設ける。該接合部は、前記缶体を形成する際に金属製パネル材の端縁部同士を互いに重合することによって形成され、該缶体は該接合部を介して筒状に形成される。
【００１４】
前記給水管は、前記燃焼室に対応する位置における缶体の外周に巻回されており、このうち、比較的温度の低い部分である前記フィンの収納位置の缶体に巻回された部分の給水管が前記突出部に当接するので、該給水管が前記缶体の外面から離間した状態を確実に維持することができる。
【００１５】
一方、燃焼室に対応して比較的温度の高い部分の缶体に巻回された給水管は、前記接合部の平坦部によって該缶体に密着されるので、当該位置の缶体を確実に冷却することができる。
【００１７】
また、本発明の前記接合部に採用した前記外折り部と前記内折り部とを互いに掛止させて圧着する接合構造は、一般にハゼ折り・ハゼ合わせと言われる接合方法であるが、本発明においては、更に、前記外折り部側を缶体の内方側に突出させることにより前記平坦部を形成し、前記内折り部側を缶体の外方側に突出させることにより前記突出部を形成する。このように、突出方向を変えることで、極めて簡単に突出部と平坦部とを形成することができる。
【００１８】
【発明の実施の形態】
本発明の一実施形態を図面に基づいて説明する。図１は本実施形態の熱交換器の縦断面説明図、図２（ａ）は図１のIIａ−IIａ線断面説明図、図２（ｂ）は図１のIIｂ−IIｂ線断面説明図、図３（ａ）及び（ｃ）は接合部の成形工程を簡略に示す説明図である。
【００１９】
本実施形態の熱交換器１は、図示しないが、給湯器の内部において比較的低い温度の炎を形成してＮＯｘの発生を抑えて比較的小型化されたバーナの上部に設けられるものである。
【００２０】
図１に示すように、該熱交換器１は、方形筒状の缶体２を備え、該缶体２の内部には複数枚のフィン３を一体に備えた吸熱水管４が収納されている。該吸熱水管４は、前記缶体２の大略上半部に設けられている。更に該缶体２の内部において該吸熱水管４のフィン３の下方（缶体２の大略下半部）には空間が形成されており、該缶体２をバーナの上部に連結することにより、該空間がバーナの燃焼室５とされる。
【００２１】
該缶体２の一側壁を貫通する該吸熱水管４の上流端には、該吸熱水管４に水を供給する給水管６が接続されている。また、該缶体２の他側壁を貫通する該吸熱水管４の下流端には、該吸熱水管４から湯を導出する出湯管７が接続されている。前記吸熱水管４は前記フィン３を水平方向に貫通して上下２列に蛇行する一本の導管によって形成されており、上段位置の吸熱水管４ａは、下段位置の吸熱水管４ｂの間の上方に位置するように配設されている。本実施形態においては、前記給水管６は、図１において下段の左端に位置する吸熱水管４ｂに接続され、前記出湯管７は、図１において上段の左端に位置する吸熱水管４ａに接続される。
【００２２】
前記給水管６は、缶体２の他側壁側（前記出湯管７が配管された側）から該缶体２の外面に沿って前記燃焼室５に対応する位置に巻回された後、前記吸熱水管４ｂに接続されている。該給水管６のうち、下方側に巻回されている第１巻回部６ａは、缶体２の外面に密着して巻回されている。該第１巻回部６ａの上方に位置し、缶体２を介してフィン３の近傍に巻回された第２巻回部６ｂは、該缶体２の外面から所定の間隙を存して巻回されている。そして該第２巻回部６ｂは、缶体２の製造時に設けられる接合部８に当接されている。
【００２３】
該接合部８は、缶体２の上端から前記給水管６の第２巻回部６ｂに当接する位置にかけて、図２（ａ）に示すように、缶体２の外面に突出する突出部９を形成しており、該突出部９の頂部に前記給水管６の第２巻回部６ｂを当接することにより、前記給水管６の第２巻回部６ｂと缶体２の外面との間隙ｘを確実に維持している。また、該接合部８は、図１に示すように、該突出部９の下端から缶体の下端にかけて、図２（ｂ）に示すように、缶体２の内方に突出することによって缶体２の外面を平坦とした平坦部１０を形成している。該平坦部１０には前記給水管６の第１巻回部６ａが巻回される。これにより、該第１巻回部６ａは缶体の外面に密着される。
【００２４】
このように、第１巻回部６ａが缶体２の外面に密着して前記燃焼室５に対応する位置に巻回されることにより、缶体２が過剰に高温となることが防止される。それだけでなく、第２巻回部６ｂが缶体２の外面から間隙を存して巻回されることによって、フィン３の近傍において缶体２の表面温度が比較的低い部分が過剰に冷却されることがなく、缶体２表面での結露の発生や、その結露による缶体２の低温腐食等を確実に防止することができる。
【００２５】
次に、前記接合部８について更に詳しく説明する。本実施形態の缶体２は２枚の金属製パネル材を夫々コ字形に折り曲げて対向させ、互いに対向する端縁同士を接合することによって方形筒状に形成されている。これによって、図１に示すように、缶体２は前側壁２ａと後側壁２ｂとの両方に接合部８が形成される。
【００２６】
該接合部８は、図３（ａ）の平面視し且つ横断面視して示す一対の金型１１，１２により形成される。第１の金型１１は平滑な第１押圧面１３と、該接合部８の前記平坦部１０に対応する溝状の第１成形凹部１４とを備え、第２の金型１２は平滑な第２押圧面１５と、該接合部８の前記突出部９に対応する溝状の第２成形凹部１６とを備えている。
【００２７】
前記金型１１，１２による接合部８を形成する際には、先ず、図３（ｂ）に示すように、一方のパネル材１７の端縁を缶体２の外面方向に折り返して外折り部１７ａを形成し、他方のパネル材１８の端縁を缶体２の内面方向に折り返して内折り部１８ａを形成する。そして、外折り部１７ａと内折り部１８ａとを互いに掛止させる。
【００２８】
次いで、図３（ｂ）に示すように、外折り部１７ａと内折り部１８ａとの掛止位置を両金型１１，１２間に位置させ、続いて、図３（ｃ）に示すように、該掛止位置を両金型１１，１２により押圧する。これにより、外折り部１７ａと内折り部１８ａとは互いに圧接されてハゼ折り・ハゼ合わせと言われる構造の接合部８が形成される。このとき、前記第１の金型１１に設けられた第１成形凹部１４と前記第２の金型１２の第２押圧面１５との圧接によって、図３（ｃ）において破線で示すように、外折り部１７ａが缶体２の内面側に突出するように形成される。ここで形成された部分は缶体２の外面側が平坦とされ、前記平坦部１０が形成される。
【００２９】
また、前記第２の金型１２に設けられた第２成形凹部１６と前記第１の金型１１の第１押圧面１３との圧接によって、図３（ｃ）において実線で示すように、内折り部１８ａが缶体２の外面側に突出するように形成され、前記突出部９が形成される。このように、前記平坦部１０と突出部９とが連続して形成された接合部８が容易に形成される。
【００３０】
なお、本実施形態の熱交換器１は、前記バーナの小型化に伴ってコンパクトに形成されるため缶体２の高さ寸法は比較的低く形成されている。これによって、前記給水管６が缶体２の周囲に一回半巻回されたものを示した。この種のコンパクトな熱交換器１の場合には、巻回された際に互いに隣り合う給水管６の間隔が比較的狭く、また給水管６の全長も比較的短くなるためにフィン３の近傍に巻回された第２巻回部６ｂの冷却作用も大きくなる。従って、第２巻回部６ｂと缶体２の外面との間に間隙を設けたことによりフィン３の近傍の温度低下を防止することは、この種のコンパクトな熱交換器１において特に好適とされる。しかし、本発明は、本実施形態のようなコンパクトな熱交換器１に限るものではなく、例えば、図示しないが、比較的大型の熱交換器であっても、フィンの近傍に巻回された給水管を缶体の外面から離間させて巻回することで、缶体の表面温度の不要な低下を防止することができ、結露やそれに伴う缶体の低温腐食等を防止することができることは言うまでもない。
【図面の簡単な説明】
【図１】本発明の一実施形態の熱交換器の縦断面説明図。
【図２】（ａ）は図１のIIａ−IIａ線断面説明図、（ｂ）は図１のIIｂ−IIｂ線断面説明図。
【図３】接合部の成形工程を示す説明図。
【図４】従来の熱交換器を示す説明図。
【符号の説明】
１…熱交換器、２…缶体、３…フィン、４…吸熱水管、５…燃焼室、６…給水管、７…出湯管、８…接合部、９…突出部、１０…平坦部、１７ａ…外折り部、１８ａ…内折り部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger of a water heater that heats supplied water to generate hot water.
[0002]
[Prior art]
The heat exchanger of the water heater includes a heat absorption water pipe integrally provided with fins in a rectangular cylindrical can. The can body has a lower open end connected to a combustion device such as a burner and introduces combustion exhaust toward the fins of the endothermic water pipe. Is formed. The endothermic water pipe is provided meandering in the horizontal direction at the upper part of the combustion chamber, a water supply pipe is connected to the upstream end, and a tapping pipe is connected to the downstream end.
[0003]
In this type of heat exchanger, in order to prevent the can body at the portion forming the outer wall of the combustion chamber from becoming excessively hot, a water supply pipe is brought into contact with the outer periphery of the can body so as to be wound a plurality of times. Thus, the can body is cooled.
[0004]
By the way, in recent years, a hot water heater is known in which a flame having a relatively low temperature is formed to suppress generation of NOx and a downsized burner is adopted. In this type of water heater, the height of the combustion chamber of the heat exchanger has been reduced along with the downsizing of the burner, so the water supply pipe is brought into contact with the combustion chamber of the can body and wound once. It is possible to sufficiently suppress the high temperature rise of the can body simply by turning.
[0005]
On the other hand, in this type of heat exchanger, an array of endothermic water tubes with high heat exchange efficiency is formed. That is, as shown in a longitudinal cross-sectional view in FIG. 4A, the heat exchanger 50 includes a plurality of rows of lower endothermic water pipes 52 provided through the lower half of the fins 51, and the upper half of the fins 51. And a plurality of rows of upper-stage endothermic water pipes 53 penetrating through the section. In order to reliably apply the combustion exhaust rising through the spaces between the lower endothermic water pipes 52 to the upper endothermic water pipes 53, the upper endothermic water pipes 53 are alternately positioned above the lower end endothermic water pipes 52. It is arranged. When each lower-stage endothermic water pipe 52 and each upper-stage endothermic water pipe 53 are provided in such an arrangement, the lower-stage endothermic water pipe 52 is schematically shown in FIG. A water supply pipe 55 is connected to one upstream side end of the can 54 shown in phantom, and a hot water discharge pipe 56 is connected to the downstream end of the upper endothermic water pipe 53 via the other side wall 54b.
[0006]
Furthermore, since it is preferable that the water supply pipe 55 and the hot water supply pipe 56 are piped away from a control unit in which an electrical part is used in the hot water supply body (not shown), the water supply pipe 55 and the hot water supply pipe are provided. 56 is connected to the same side of the can 54.
[0007]
As described above, when the water supply pipe 55 is disposed so as to satisfy various conditions, the water supply pipe 55 is attached to the can 54 at a position corresponding to the combustion chamber 57 for cooling as shown in FIG. Since the water supply pipe 55 needs to be brought into contact and wound once, and the water supply pipe 55 needs to be piped on the same side as the hot water discharge pipe 56, as shown schematically in FIG. The water supply pipe 55 must be wound once and a half.
[0008]
However, as shown in FIG. 4A, the water supply pipe 55a wound around the can body 54 is provided at a position corresponding to the combustion chamber 57 where the surface temperature of the can body 54 is relatively high. The water supply pipe 55b wound half-turn is brought into contact with the vicinity of the fin 51 where the surface temperature of the can body 54 is relatively low over a relatively long distance. This can be further reduced, causing condensation on the can body 54, and further, there is a risk that low temperature corrosion will occur on the can body 54 due to condensation at this time.
[0009]
[Problems to be solved by the invention]
An object of the present invention is to provide a heat exchanger for a hot water heater that can reliably prevent corrosion and damage to a can body due to condensation without impairing the cooling effect of the water supply pipe. .
[0010]
[Means for Solving the Problems]
In order to achieve such an object, the present invention includes a rectangular cylindrical can body in which a combustion chamber for burning a burner is formed in a substantially lower half portion, and a fin housed in a substantially upper half portion of the can body. An endothermic water pipe provided integrally, a water supply pipe connected to the upstream end of the endothermic water pipe passing through one side wall of the can body, and a hot water connected to the downstream end of the endothermic water pipe passing through the other side wall of the can body A heat exchanger of a water heater in which the water supply pipe is wound around the outer periphery of the can body corresponding to the combustion chamber, and the fin among the water supply pipes wound around the outer periphery of the can body the wound portion in proximity to the storage position of the winding to exist a gap from the outer surface of the can body, the can body is polymerized together edge portions of the plate-shaped metallic panels It is formed in a cylindrical shape via a joined part, and the joined part is formed by the water supply pipe wound around the outer periphery of the can body. A flat portion joined flatly at a position where the body is tightly wound around the outer periphery of the body, and an outer side of the can body at a position where the water supply pipe is wound with a gap from the outer surface of the can body And a protrusion that is formed so as to abut against the water supply pipe and maintain the gap, and the joint includes an outer folded portion that is folded outward along one end edge of the panel material, and an other end edge. And the inner folded portion folded back inward is crimped to each other, and the flat portion is formed by flattening the outer side of the can body of the inner folded portion and the outer folded portion as the can body. The projecting part is formed by projecting the inner folding part to the outer side of the can body and flattening the inner side of the can body of the outer folding part. It is characterized by being.
[0011]
The water supply pipe is wound around the outer periphery of the can body corresponding to the combustion chamber, thereby cooling the can body at a relatively high temperature corresponding to the combustion chamber, and the surface temperature of the can body is An excessively high temperature is prevented. At this time, in the present invention, the water supply pipe wound in the vicinity of the fin housing position is separated from the outer surface of the can body by the gap. As a result, the water supply pipe is not brought into contact with the can body at the fin housing position, which is a relatively low temperature portion, so that the surface temperature of the can body at the position does not decrease excessively, and condensation forms on the can body. Can be prevented, and damage to the can due to low temperature corrosion can be prevented.
[0013]
Moreover, in this invention, the said flat part and the said protrusion part are provided in the said junction part currently formed in the said can body. The joint portion is formed by polymerizing the edge portions of the metal panel material to each other when the can body is formed, and the can body is formed in a cylindrical shape via the joint portion.
[0014]
The water supply pipe is wound around the outer periphery of the can body at a position corresponding to the combustion chamber, and of these, the portion wound around the can body at the fin storage position, which is a relatively low temperature portion. Since the water supply pipe comes into contact with the protruding portion, the state where the water supply pipe is separated from the outer surface of the can body can be reliably maintained.
[0015]
On the other hand, the water supply pipe wound around the can body at a relatively high temperature corresponding to the combustion chamber is brought into close contact with the can body by the flat portion of the joint portion, so that the can body at the position can be securely attached. Can be cooled.
[0017]
In addition, the joining structure in which the outer fold portion and the inner fold portion employed in the joint portion of the present invention are hooked and pressure-bonded to each other is a joining method generally referred to as goby folding / haze matching. Further, the flat portion is formed by projecting the outer folding portion side toward the inner side of the can body, and the projecting portion is formed by projecting the inner folding portion side toward the outer side of the can body. Form. Thus, by changing the protruding direction, the protruding portion and the flat portion can be formed very easily.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. 1 is a longitudinal sectional view of the heat exchanger of the present embodiment, FIG. 2 (a) is a sectional view taken along the line IIa-IIa in FIG. 1, FIG. 2 (b) is a sectional view taken along the line IIb-IIb in FIG. FIGS. 3A and 3C are explanatory views simply showing the molding process of the joint.
[0019]
Although not shown in the drawings, the heat exchanger 1 of the present embodiment is provided at the upper part of a burner that is relatively downsized by forming a flame at a relatively low temperature inside the water heater to suppress generation of NOx. .
[0020]
As shown in FIG. 1, the heat exchanger 1 includes a rectangular tubular can body 2, and an endothermic water pipe 4 integrally including a plurality of fins 3 is accommodated in the can body 2. . The endothermic water pipe 4 is provided in the upper half of the can 2. Further, a space is formed in the inside of the can body 2 below the fins 3 of the endothermic water pipe 4 (substantially lower half of the can body 2), and by connecting the can body 2 to the upper part of the burner, This space is the combustion chamber 5 of the burner.
[0021]
A water supply pipe 6 for supplying water to the endothermic water pipe 4 is connected to an upstream end of the endothermic water pipe 4 that penetrates one side wall of the can body 2. A hot water discharge pipe 7 for connecting hot water from the endothermic water pipe 4 is connected to the downstream end of the endothermic water pipe 4 penetrating the other side wall of the can body 2. The endothermic water pipe 4 is formed by a single pipe that passes through the fins 3 in the horizontal direction and meanders in two rows, and the upper end position of the endothermic water pipe 4a is located above the lower end position of the endothermic water pipe 4b. It arrange | positions so that it may be located. In the present embodiment, the water supply pipe 6 is connected to the endothermic water pipe 4b located at the lower left end in FIG. 1, and the tapping pipe 7 is connected to the endothermic water pipe 4a located at the upper left end in FIG. .
[0022]
The water supply pipe 6 is wound from the other side wall side of the can body 2 (the side where the tap water pipe 7 is piped) to the position corresponding to the combustion chamber 5 along the outer surface of the can body 2, It is connected to the endothermic water pipe 4b. Of the water supply pipe 6, the first winding part 6 a wound downward is wound in close contact with the outer surface of the can body 2. The second winding part 6b, which is located above the first winding part 6a and wound in the vicinity of the fin 3 via the can body 2, has a predetermined gap from the outer surface of the can body 2. It is wound. And this 2nd winding part 6b is contact | abutted to the junction part 8 provided at the time of manufacture of the can body 2. As shown in FIG.
[0023]
The joint 8 extends from the upper end of the can body 2 to a position in contact with the second winding portion 6b of the water supply pipe 6 as shown in FIG. And a gap between the second winding portion 6b of the water supply pipe 6 and the outer surface of the can body 2 by bringing the second winding portion 6b of the water supply pipe 6 into contact with the top of the protruding portion 9. x is reliably maintained. Further, as shown in FIG. 1, the joint 8 protrudes inward from the can body 2 as shown in FIG. 2B from the lower end of the projecting portion 9 to the lower end of the can body. A flat portion 10 having a flat outer surface of the body 2 is formed. The first winding portion 6 a of the water supply pipe 6 is wound around the flat portion 10. Thereby, this 1st winding part 6a is closely_contact | adhered to the outer surface of a can body.
[0024]
In this way, the first winding portion 6a is closely attached to the outer surface of the can body 2 and wound at a position corresponding to the combustion chamber 5, thereby preventing the can body 2 from becoming excessively hot. . In addition, since the second winding portion 6b is wound from the outer surface of the can body 2 with a gap, the portion where the surface temperature of the can body 2 is relatively low in the vicinity of the fins 3 is excessively cooled. It is possible to reliably prevent the occurrence of condensation on the surface of the can body 2 and the low-temperature corrosion of the can body 2 due to the condensation.
[0025]
Next, the joint portion 8 will be described in more detail. The can body 2 of the present embodiment is formed in a rectangular cylindrical shape by bending two metal panel members into a U-shape and making them face each other and joining edges that face each other. As a result, as shown in FIG. 1, the can body 2 is formed with joint portions 8 on both the front side wall 2a and the rear side wall 2b.
[0026]
The joint 8 is formed by a pair of molds 11 and 12 shown in a plan view and a cross-sectional view in FIG. The first mold 11 includes a smooth first pressing surface 13 and a groove-shaped first molding recess 14 corresponding to the flat portion 10 of the joint 8, and the second mold 12 is a smooth first 2 is provided with a pressing surface 15 and a groove-shaped second molding recess 16 corresponding to the protrusion 9 of the joint 8.
[0027]
When forming the joint portion 8 by the molds 11 and 12, first, as shown in FIG. 3 (b), the edge of one panel member 17 is folded back toward the outer surface of the can body 2 to form an outer folding portion. 17a is formed, and the end edge of the other panel member 18 is folded back toward the inner surface of the can body 2 to form the inner folded portion 18a. And the outer folding part 17a and the inner folding part 18a are latched together.
[0028]
Next, as shown in FIG. 3 (b), the latching position of the outer folding part 17a and the inner folding part 18a is positioned between the molds 11 and 12, and subsequently, as shown in FIG. 3 (c). The latching position is pressed by both molds 11 and 12. As a result, the outer folded portion 17a and the inner folded portion 18a are pressed against each other to form the joint portion 8 having a structure called goby folding / going together. At this time, as shown by a broken line in FIG. 3C, due to the pressure contact between the first molding recess 14 provided in the first mold 11 and the second pressing surface 15 of the second mold 12, The outer folding part 17 a is formed so as to protrude to the inner surface side of the can body 2. The portion formed here is flat on the outer surface side of the can body 2, and the flat portion 10 is formed.
[0029]
In addition, as shown by a solid line in FIG. 3C, the inner surface of the second mold 12 is pressed by the second pressing recess 16 provided in the second mold 12 and the first pressing surface 13 of the first mold 11. The folding portion 18a is formed so as to protrude to the outer surface side of the can body 2, and the protruding portion 9 is formed. In this manner, the joint portion 8 in which the flat portion 10 and the protruding portion 9 are continuously formed is easily formed.
[0030]
In addition, since the heat exchanger 1 of this embodiment is formed compactly with the miniaturization of the burner, the height of the can body 2 is formed relatively low. This shows that the water supply pipe 6 is wound around the can body 2 once and a half. In the case of this type of compact heat exchanger 1, the interval between the water supply pipes 6 adjacent to each other when wound is relatively narrow, and the total length of the water supply pipes 6 is also relatively short, so The cooling effect of the second winding portion 6b wound around the coil is also increased. Therefore, it is particularly preferable in this type of compact heat exchanger 1 to prevent a temperature drop near the fins 3 by providing a gap between the second winding portion 6b and the outer surface of the can body 2. Is done. However, the present invention is not limited to the compact heat exchanger 1 as in the present embodiment. For example, although not shown, even a relatively large heat exchanger is wound around the fins. By winding the water supply pipe away from the outer surface of the can body, an unnecessary decrease in the surface temperature of the can body can be prevented, and condensation and low temperature corrosion of the can body can be prevented. Needless to say.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional explanatory view of a heat exchanger according to an embodiment of the present invention.
2A is a sectional view taken along line IIa-IIa in FIG. 1, and FIG. 2B is a sectional view taken along line IIb-IIb in FIG.
FIG. 3 is an explanatory view showing a forming process of a joint portion.
FIG. 4 is an explanatory view showing a conventional heat exchanger.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Heat exchanger, 2 ... Can body, 3 ... Fin, 4 ... Endothermic water pipe, 5 ... Combustion chamber, 6 ... Water supply pipe, 7 ... Hot water pipe, 8 ... Joint part, 9 ... Projection part, 10 ... Flat part, 17a ... outer fold, 18a ... inner fold.

Claims (1)

バーナの燃焼を行う燃焼室が大略下半部に形成された方形筒状の缶体と、該缶体の大略上半部に収納されたフィンを一体に備える吸熱水管と、該缶体の一側壁を貫通する前記吸熱水管の上流端に接続された給水管と、該缶体の他側壁を貫通する前記吸熱水管の下流端に接続された出湯管とを備え、前記燃焼室に対応する缶体の外周に前記給水管を巻回させた給湯器の熱交換器において、
前記缶体の外周に巻回された前記給水管のうち、前記フィンの収納位置に近接して巻回された部分は前記缶体の外面から間隙を存して巻回され、
前記缶体は、板状の金属製パネル材の端縁部同士を互いに重合して接合された接合部を介して筒状に形成され、
該接合部は、前記缶体の外周に巻回された前記給水管が該缶体の外周に密着して巻回される位置において平坦に接合された平坦部と、該給水管が前記缶体の外面から間隙を存して巻回される位置において前記缶体の外方に突出形成され、該給水管に当接して前記間隙を維持する突出部とを備え、
前記接合部は、前記パネル材の一端縁に沿って外側に折り返された外折り部と他端縁に沿って内側に折り返された内折り部とを互いに掛止させて圧着することにより形成され、
前記平坦部は、前記内折り部の缶体の外方側を平坦とし且つ前記外折り部を缶体の内方側に突出させることにより形成され、
前記突出部は、前記内折り部を缶体の外方側に突出させ且つ前記外折り部の缶体の内方側を平坦とすることにより形成されていることを特徴とする給湯器の熱交換器。A rectangular cylindrical can body in which a combustion chamber for burning a burner is formed in a substantially lower half portion, a heat absorption water pipe integrally provided with fins accommodated in a substantially upper half portion of the can body, and one of the can bodies A water supply pipe connected to the upstream end of the endothermic water pipe penetrating the side wall, and a tapping pipe connected to the downstream end of the endothermic water pipe penetrating the other side wall of the can body, the can corresponding to the combustion chamber In the heat exchanger of the water heater in which the water supply pipe is wound around the outer periphery of the body,
Wherein one of the can body the water supply pipe which is wound around the outer periphery of the wound portions in close proximity to the storage position of the fin is wound by exist a gap from the outer surface of the can body,
The can body is formed into a cylindrical shape via a joint portion obtained by superposing the edge portions of the plate-like metal panel materials on each other and joining them,
The joint includes a flat portion joined flatly at a position where the water supply pipe wound around the outer periphery of the can body is tightly wound around the outer periphery of the can body, and the water supply pipe is the can body A protrusion projecting outward of the can body at a position where the gap is wound from the outer surface of the can, and a protrusion that contacts the water supply pipe and maintains the clearance,
The joint portion is formed by hooking an outer fold portion folded outward along one edge of the panel material and an inner fold portion folded inward along the other end edge and crimping each other. ,
The flat portion is formed by making the outer side of the can body of the inner fold portion flat and projecting the outer fold portion to the inner side of the can body,
The protrusion is formed by causing the inner fold to protrude outward from the can body and flattening the inner side of the outer fold from the can body. Exchanger.
JP03313399A 1999-02-10 1999-02-10 Water heater heat exchanger Expired - Fee Related JP3703645B2 (en)

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TW088121470A TW484006B (en) 1999-02-10 1999-12-08 Heat exchanger for hot-water supplier
KR1019990060854A KR100345350B1 (en) 1999-02-10 1999-12-23 Heat exchanger of a hot-water supplier

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