JPH0575934B2

JPH0575934B2 -

Info

Publication number: JPH0575934B2
Application number: JP60068363A
Authority: JP
Inventors: Zetsuto Uaago Otsutoo; Uentsueru Aanesuto
Original assignee: State Industries LLC
Current assignee: State Industries LLC
Priority date: 1984-03-30
Filing date: 1985-03-30
Publication date: 1993-10-21
Also published as: EP0156228A2; AU576826B2; CA1264621A; ATE43899T1; JPS616539A; AU3941485A; EP0156228A3; DE3570914D1; EP0156228B1

Abstract

A water heater tank assembly having a shell with top and bottom heads welded in opposite ends thereof. The heads have aligned flue tube mounting openings therein in which metal collar members are welded. Flue tubes are mounted in and welded to the collar members. The collar members serve as a heat sink to prevent damage to the glass lining on the shell, head members and flue tubes during the various welding operations.

Description

[Detailed description of the invention]

発明の背景発明の技術分野本発明はタンクの両ヘツドの間を延びる複数の
炉筒を有するガス焚き温水器の構造と該タンクの
製作方法とに関する。従来技術の説明従来のガス焚き温水器においては、炉筒はタン
クの底部および頂部ヘツドに直接溶接されてい
る。ガラスライニングされた炉筒、タンクのヘツ
ドや底部およびタンクの外殻を溶接する場合に発
生する高温が耐触ガラスライニング面を割つたり
亀裂させたりしてその下にある鋼をむき出しにす
る可能性がある。ガラスライニング面における前
記のような傷はタンクを早期疲労に導くことが多
い。本発明の目的は、溶接による熱と、この熱に伴
つて種々の接続部、丸味部分および隣接する部分
に発生する応力とに起因するガラスライニングの
割れが概ね防止される温水器構造とその製作方法
とを提供することである。発明の要約第１の本発明は、温水器の内面がガラスライニング２９されてい
る温水器タンク組立体であつて、両端に頂部ヘツド部材１４と底部ヘツド部材１
６とを溶接３４した外殻１２であつて、前記両ヘ
ツド部材１４，１６が複数の整合した炉筒１８を
取り付ける開口３６を有する外殻１２と、前記炉筒取付用開口３６に取り付けられた複数
の金属製カラー部材２２であつて、該カラー部材
の各々が円形のフランジ部分２６と、該フランジ
部分から延びる円筒形の本体部分２４とを有し、
前記カラー部材は前記フランジ部分２６を前記頂
部および底部ヘツド部材１４，１６の内面に対面
させて位置させ、かつ前記円筒形の本体部分２４
を前記頂部および底部ヘツド部材の外面の上方お
よび下方の点まで前記炉筒取付用開口３６を貫通
して延在させて前記炉筒取付用開口３６に取り付
けられており、かつ前記カラー部材の前記フラン
ジ部分２６の周りを延びる溶接部２８によつて前
記頂部および底部ヘツド部材に溶接されたカラー
部材２２と、前記カラー部材の前記円筒形本体部分２４の端
部を通つて端部が延びるようにして前記カラー部
材の前記円筒形部分に取り付けられ、その外面が
ガラスライニング２９されている複数の炉筒１８
であつて前記カラー部材２２の前記円筒形本体部
分２４の端部の周りを延びる溶接部３０によつて
前記カラー部材に溶接された炉筒１８とを含む、
温水器タンク組立体』に係る。従つて、上記本発明によれば、次に示す効果が
ある、。円形（円盤形）のフランジ部分２６及び円筒
形本体部分２４からなるカラー部材２２の該円
筒形本体部分を両ヘツド部材１４，１６の各炉
筒取付用開口３６内に炉筒１８の外周に嵌合さ
せて挿通突出させているため、該本体部分の端
部と炉筒とを溶接３０する際に特に本体部分２
４がヒートシンクとして作用するので、両ヘツ
ド部材内面のガラスライニングを損傷すること
がなく、タンクの信頼性及び耐久性を向上し得
る。カラー部材の円筒形本体部分２４の長さ及び
厚さを可変することにより容易にヒートシンク
機能の容量を可変設定でき、応用範囲が広く、
かつカラー部材の構造が簡単でかつヘツド部材
への組付けもきわめて容易でありコスト的に有
利である。また、第２の本発明は、その内面がガラスライニング２９された温水器
タンク組立体を製作する方法であつて、 BACKGROUND OF THE INVENTION TECHNICAL FIELD OF THE INVENTION This invention relates to the structure of a gas-fired water heater having a plurality of furnace tubes extending between the heads of the tank and to a method of manufacturing the tank. Description of the Prior Art In conventional gas-fired water heaters, the furnace barrel is welded directly to the bottom and top heads of the tank. The high temperatures generated when welding glass-lined furnace tubes, tank heads and bottoms, and tank shells can crack or crack the corrosion-resistant glass lining surface, exposing the underlying steel. There is sex. Such scratches on the glass lining surface often lead to premature tank fatigue. SUMMARY OF THE INVENTION The object of the present invention is to provide a water heater structure and its fabrication in which cracking of the glass lining due to the heat caused by welding and the stress generated by this heat in various joints, rounded parts and adjacent parts is generally prevented. The purpose is to provide a method. SUMMARY OF THE INVENTION A first aspect of the present invention is a water heater tank assembly in which the inner surface of the water heater is glass lined 29, and includes a top head member 14 and a bottom head member 1 at both ends.
6, the outer shell 12 has an opening 36 for attaching a plurality of aligned furnace tubes 18, and the head members 14, 16 are attached to the furnace tube attachment opening 36. a plurality of metallic collar members 22 each having a circular flange portion 26 and a cylindrical body portion 24 extending from the flange portion;
The collar member positions the flange portion 26 facing the inner surfaces of the top and bottom head members 14, 16 and the cylindrical body portion 24.
are attached to the tube attachment opening 36 by extending through the tube attachment opening 36 to points above and below the outer surfaces of the top and bottom head members, and a collar member 22 welded to the top and bottom head members by a weld 28 extending around a flange portion 26 and with an end extending through the end of the cylindrical body portion 24 of the collar member; a plurality of furnace tubes 18 which are attached to the cylindrical portion of the collar member and whose outer surfaces are lined with glass 29;
a furnace tube 18 welded to the collar member by a weld 30 extending around an end of the cylindrical body portion 24 of the collar member 22;
Related to “Water Heater Tank Assembly”. Therefore, according to the present invention, there are the following effects. The cylindrical body portion of the collar member 22 consisting of a circular (disc-shaped) flange portion 26 and a cylindrical body portion 24 is fitted onto the outer periphery of the furnace tube 18 into each furnace tube attachment opening 36 of both head members 14 and 16. Since the end portion of the main body portion and the furnace cylinder are welded 30 together, the main body portion 2 is inserted and protruded.
4 acts as a heat sink, the glass linings on the inner surfaces of both head members are not damaged, and the reliability and durability of the tank can be improved. By changing the length and thickness of the cylindrical main body portion 24 of the collar member, the capacity of the heat sink function can be easily set variable, and the range of application is wide.
In addition, the structure of the collar member is simple and assembly to the head member is extremely easy, which is advantageous in terms of cost. Further, the second invention is a method of manufacturing a water heater tank assembly whose inner surface is glass-lined 29, comprising:

【１】円筒形フランジ部分２６と該フランジ
部分から延びる円筒形の本体部分２４とを有
する複数のカラー部材２２を、前記フランジ
部分２６が頂部および底部ヘツド部材１４，
１６の水に接すべき側に対面して位置し、前
記円筒形本体部分２４が前記頂部および底部
ヘツド部材の外面の上方および下方の点まで
炉筒取付用開口３６を貫通して延びるように
前記頂部および底部ヘツド部材の炉筒取付用
開口３６に取り付け、1. A plurality of collar members 22 having a cylindrical flange portion 26 and a cylindrical body portion 24 extending from the flange portion, the flange portions 26 being connected to the top and bottom head members 14,
16 such that the cylindrical body portion 24 extends through the tube mounting opening 36 to a point above and below the outer surfaces of the top and bottom head members. attached to the furnace tube attachment openings 36 of the top and bottom head members;

【２】各カラー部材２２のフランジ部分２６
を前記頂部および底部ヘツド部材１４，１６
の内面に溶接２８し、[2] Flange portion 26 of each collar member 22
The top and bottom head members 14, 16
Welded 28 to the inner surface of

【３】前記カラー部材２２を溶接した前記頂
部および底部ヘツド部材の水に接すべき側に
ガラスライニング２９を施し、[3] A glass lining 29 is provided on the sides of the top and bottom head members to which the collar member 22 is welded, which should be in contact with water;

【４】予め内面にガラスライニング２９を施
した外殻部材１２の両端に前記頂部および底
部ヘツド部材１４，１６を、圧入させ、[4] The top and bottom head members 14 and 16 are press-fitted into both ends of the outer shell member 12, the inner surface of which has been previously provided with a glass lining 29,

【５】前記頂部または底部ヘツド部材１４，
１６のいづれかを前記外殻１２に溶接３４
し、[5] The top or bottom head member 14,
16 to the outer shell 12.
death,

【６】予め外面にガラスライニング２９を施
した炉筒１８を、炉筒端部がカラー部材２２
の円筒形本体部分２４の端部を越えて延在す
るように、前記カラー部材に挿入し、[6] The furnace tube 18, which has been provided with a glass lining 29 on its outer surface in advance, is attached to the collar member 22 at the end of the furnace tube.
inserted into the collar member so as to extend beyond the end of the cylindrical body portion 24 of the collar member;

【７】前記カラー部材２２の円筒形本体部２
４に前記炉筒１８を溶接３０し、[7] Cylindrical body portion 2 of the collar member 22
Welding 30 the furnace tube 18 to 4,

【８】前記工程[8] The above process

【５】において頂部ヘツド部
材１４または底部ヘツド部材１６のいづれか
を外殻１２に溶接したかによつて底部ヘツド
部材１６または頂部ヘツド部材１４を前記外
殻１２に圧入した後、前記After the bottom head member 16 or the top head member 14 is press-fitted into the outer shell 12 depending on whether the top head member 14 or the bottom head member 16 is welded to the outer shell 12 in [5], the

【６】及び[6] and

【７】
と同様の工程により溶接する工程を含む温水
器タンク組立体を製作する方法に係る。従つて、上記第２の本発明によれば、次に示す
効果がある。カラー部材を予め頂部及び底部ヘツド部材に
夫々溶接位置決めした後にガラスライニングを
施し、何れか一方のヘツド部材を外殻内に圧入
して溶接３４した後、炉筒を該圧入ヘツド部材
に挿入して上記カラー部材との間を溶接３０
し、しかる後他のヘツド部材を圧入して同様の
溶接をするようにしているため、カラー部材を
追加して上記及びに述べた効果を生ずると
共に、該カラー部材の溶接位置決めというわず
かな工数が増すのみで一層コスト的に有利であ
る。好適実施例の説明本発明による温水器タンク構造はガスまたは石
油焚きの温水器に関し、特に市販のガスまたは油
焚き温水器に関する。第１図を参照すれば、温水器タンク組立体１０
は以下の基本的部材、即ち外殻１２、頂部ヘツド
部材１４、底部ヘツド部材１６および複数の炉筒
１８とから構成されている。頂部および底部ヘツ
ド部材１４，１６にはフランジ３２が設けられて
いる。適当な構造のガスまたはオイルバーナ組立
体（図示せず）が底部ヘツド部材１６の下方の燃
焼室２０に装着されている。炉筒１８を上方に貫
流する燃焼生成物は、温水器の頂部に装着された
適当な構造の通気手段により温水器から排出され
る。第４図に示されているように、本発明の重要な
特徴は頂部および底部ヘツド部材１４，１６に炉
筒１８を装着するカラー部材２２を使用すること
である。各カラー部材２２は、該カラー部材から
延び、かつ一体形成されている円筒形本体２４を
有する円形フランジ部分２６から構成されてい
る。カラー部材２２は、頂部および底部ヘツド部
材１４，１６の炉筒取付用開口３６に装着されて
いる。前記カラー部材２２により達成される構造
と利点とを以下詳細に説明する。本発明による温水器は好適実施例において以下
のように構成される。第一の工程は、フランジ部分２６を頂部と底部
のヘツド部材１４，１６の内面に対面させてカラ
ー部材を前記ヘツド部材１４，１６の開口３６に
取り付けることである。次の工程は、溶接２８に
より各カラー部材２２のフランジ２６を頂部およ
び底部ヘツド部材１４，１６の内面に溶接するこ
とである。この点に関して、頂部ヘツド１４と底
部ヘツド１６とにおけるカラー部材２２と炉筒１
８との最終的な組立配置は同一であるため、同一
の参照番号を使用している。次の工程は、カラー部材２２を溶接した頂部お
よび底部ヘツド部材１４，１６の内側（水を入れ
る側）となる部分へガラスライニングを施すこと
である。このように、ガラスライニングは、ヘツ
ド部材の内面とカラーフランジ２６の面とを覆
い、更にフランジと、カラー２２の円筒形本体部
の内面２２Ａとの間の溶接部を覆う。参照番号２
９は温水器の内面のガラスライニングを示す。ガ
ラスライニングは、他の部分と異なる縮尺で図示
してある。次の工程は、フランジ３２を外殻部材１２の内
側から上下方向に延在させて頂部ヘツド部材１４
と底部ヘツド部材１６とを外殻部材１２の両端ヘ
ツド圧入することである。この工程に先立つて、
外殻部材の内面にガラスライニングを施す。次いで、頂部ヘツド部材１４または底部ヘツド
部材１６のいづれかのフランジ３２が溶接３４に
よつて外殻に溶接される。説明の便宜上、底部ヘ
ツド１６を最初に外殻１２に溶接する。フランジ
３２は溶接３４がなされる際ヘツド部材上のガラ
スライニングに傷がつかないよう十分長くつくら
れている。好適実施例においては、頂部ヘツド部
材１４と底部ヘツド部材１６のフランジ３２の最
小長さは約73ミリ（２−７／８インチ）である。次に、炉筒１８がその両端をカラー部材２２の
円筒形本体部分２４を通過させてカラー２２へ挿
入される。炉筒１８は、この組立てに先立つて外
面にガラスライニングを施してある。次に、炉筒１８の下端が溶接３０によりカラー
２２の円筒形本体部分２４の端部に溶接される。
この際にも、前述した形状のカラー２２を使用す
ることにより、ヘツド部材１６とカラーのフラン
ジ２６上のガラスライニングから離れた位置で溶
接３０が行われる。カラーの本体２４とフランジ
２６をなす金属が溶接中ヒートシンクとして作用
しガラスライニングに対する損傷を阻止する。好
適実施例においては、（フランジ２６の上面から
の）円筒形本体部２４の最小長さは約20.6ミリ
（13/16インチ）である。ここで、典型的な従来技術による温水器タンク
構造を示す第３図を参照する。図示のように、炉
筒１９はヘツド１７に直接溶接されている。溶接
部３１が底部ヘツドのガラスライニングと近接し
ているために、溶接を行う際に発生する熱がガラ
スライニングを亀裂させ、終局的にタンクの早期
故障に導く場合がある。本発明においては、次いで、炉筒１８の上端が
溶接部３０によつてカラー２２の円筒形本体部２
４の端部に溶接される。その際にも、カラー２２
は溶接の間ヒートシンクとして作用し頂部ヘツド
のガラスライニングに対する損傷を阻止する。最終工程は溶接部３４によつて頂部ヘツド部材
１４のフランジ３２を外殻１２に溶接することで
ある。ここで、頂部ヘツド部材１４と外殻との間で最
終の溶接３４を行う前に炉筒１８の頂部と底部の
双方に溶接３０を行うことが重要であることに注
目すべきである。前記工程を実施することによ
り、溶接３０を行う際頂部ヘツド部材は外殻に関
して「浮動」しうる。溶接３０を行う場合、関連
部材に若干の膨張収縮がありうるが、この動きは
頂部ヘツド部材と外殻との間の「浮動」関係によ
り吸収される。[7]
The present invention relates to a method of manufacturing a water heater tank assembly including a step of welding by a process similar to the above. Therefore, according to the second aspect of the present invention, there are the following effects. After welding and positioning the collar members to the top and bottom head members in advance, a glass lining is applied, one of the head members is press-fitted into the outer shell and welded 34, and then the furnace cylinder is inserted into the press-fitted head members. Welding between the above collar member 30
However, since the other head members are then press-fitted and welded in the same way, the collar member is added to produce the effects described above and above, and the small man-hour of welding positioning of the collar member is reduced. It is even more advantageous in terms of cost just by increasing the amount. DESCRIPTION OF THE PREFERRED EMBODIMENTS The water heater tank structure according to the present invention relates to gas or oil fired water heaters, and more particularly to commercially available gas or oil fired water heaters. Referring to FIG. 1, water heater tank assembly 10
The furnace is comprised of the following basic components: a shell 12, a top head 14, a bottom head 16, and a plurality of furnace tubes 18. Flanges 32 are provided on the top and bottom head members 14,16. A suitably constructed gas or oil burner assembly (not shown) is mounted in the combustion chamber 20 below the bottom head member 16. The combustion products flowing upwardly through the furnace tube 18 are discharged from the water heater by suitably constructed ventilation means mounted on the top of the water heater. As shown in FIG. 4, an important feature of the invention is the use of collar members 22 to attach the furnace tube 18 to the top and bottom head members 14,16. Each collar member 22 is comprised of a circular flange portion 26 having a cylindrical body 24 extending therefrom and integrally formed therein. The collar member 22 is mounted in the furnace tube mounting openings 36 in the top and bottom head members 14,16. The structure and advantages achieved by the collar member 22 will be described in detail below. In a preferred embodiment, the water heater according to the invention is constructed as follows. The first step is to attach the collar member to the opening 36 of the top and bottom head members 14,16 with the flange portion 26 facing the inner surface of the head members 14,16. The next step is to weld the flanges 26 of each collar member 22 to the inner surfaces of the top and bottom head members 14, 16 by welding 28. In this regard, the collar members 22 at the top head 14 and the bottom head 16 and the furnace tube 1
Since the final assembly arrangement is the same as in Figure 8, the same reference numbers are used. The next step is to apply a glass lining to the interior (water inlet side) of the top and bottom head members 14, 16 to which the collar member 22 is welded. The glass lining thus covers the inner surface of the head member and the surface of the collar flange 26, and also covers the weld between the flange and the inner surface 22A of the cylindrical body of the collar 22. Reference number 2
9 indicates the glass lining of the inner surface of the water heater. The glass lining is shown to a different scale than the other parts. The next step is to extend the flange 32 vertically from inside the outer shell member 12 to attach the top head member 14.
and the bottom head member 16 are press-fitted into both ends of the outer shell member 12. Prior to this process,
A glass lining is applied to the inner surface of the outer shell member. The flange 32 of either the top head member 14 or the bottom head member 16 is then welded to the shell by weld 34. For convenience of illustration, bottom head 16 is first welded to shell 12. The flange 32 is made long enough to avoid damaging the glass lining on the head member when the weld 34 is made. In the preferred embodiment, the minimum length of flanges 32 on top head member 14 and bottom head member 16 is approximately 2-7/8 inches. Furnace tube 18 is then inserted into collar 22 with its ends passed through cylindrical body portion 24 of collar member 22. Prior to assembly, the furnace tube 18 is lined with glass on its outer surface. The lower end of furnace tube 18 is then welded to the end of cylindrical body portion 24 of collar 22 by weld 30.
Also in this case, by using the collar 22 having the shape described above, the welding 30 is performed at a position away from the glass lining on the head member 16 and the flange 26 of the collar. The metal forming the body 24 and flange 26 of the collar acts as a heat sink during welding to prevent damage to the glass lining. In the preferred embodiment, the minimum length of cylindrical body 24 (from the top of flange 26) is approximately 13/16 inches. Reference is now made to FIG. 3, which shows a typical prior art water heater tank structure. As shown, the furnace tube 19 is welded directly to the head 17. Because of the proximity of the weld 31 to the glass lining of the bottom head, the heat generated during welding can cause the glass lining to crack, ultimately leading to premature failure of the tank. In the present invention, the upper end of the furnace tube 18 is then connected to the cylindrical body portion 2 of the collar 22 by the welding portion 30.
Welded to the end of 4. In that case, color 22
acts as a heat sink during welding and prevents damage to the glass lining of the top head. The final step is to weld the flange 32 of the top head member 14 to the shell 12 by weld 34. It should be noted that it is important to perform welds 30 on both the top and bottom of the furnace barrel 18 before performing the final weld 34 between the top head member 14 and the shell. By performing the steps described above, the top head member can "float" relative to the shell when welding 30 is performed. When performing the weld 30, there may be some expansion and contraction of the associated members, but this movement is accommodated by the "floating" relationship between the top head member and the outer shell.

[Brief explanation of the drawing]

第１図は本発明により構成した温水器タンク組
立体の（一部破断した）側面図、第２図は第１図
に示す温水器タンクの上面図、第３図は典型的な
従来技術による温水器タンク構造を示す部分断面
図、第４図は第１図に示す温水器タンクの丸で囲
つた部分の拡大部分断面図、および第５図は底部
ヘツド部材と外殻との間の接続の拡大部分断面図
である。図において、１０……温水器タンク組立体、１
２……外殻、１４……頂部ヘツド部材、１６……
底部ヘツド部材、１８……炉筒、２２……カラー
部材、２４……円筒形本体部、２６……フランジ
部分、２９……ガラスライニング。 1 is a side view (partially cut away) of a water heater tank assembly constructed in accordance with the present invention; FIG. 2 is a top view of the water heater tank shown in FIG. 1; and FIG. 3 is a typical prior art construction. FIG. 4 is an enlarged partial cross-sectional view of the circled portion of the water heater tank shown in FIG. 1, and FIG. 5 is a partial sectional view showing the structure of the water heater tank; FIG. FIG. In the figure, 10... Water heater tank assembly, 1
2...Outer shell, 14...Top head member, 16...
Bottom head member, 18...Furnace barrel, 22...Collar member, 24...Cylindrical main body portion, 26...Flange portion, 29...Glass lining.

Claims

[Scope of Claims] 1. A water heater tank assembly in which the inner surface of the water heater is lined with glass 29, comprising a top head member 14 and a bottom head member 1 at both ends.
6, the outer shell 12 has an opening 36 for attaching a plurality of aligned furnace tubes 18, and the head members 14, 16 are attached to the furnace tube attachment opening 36. a plurality of metallic collar members 22 each having a circular flange portion 26 and a cylindrical body portion 24 extending from the flange portion;
The collar member positions the flange portion 26 facing the inner surfaces of the top and bottom head members 14, 16 and the cylindrical body portion 24.
are attached to the tube attachment opening 36 by extending through the tube attachment opening 36 to points above and below the outer surfaces of the top and bottom head members, and are attached to the tube attachment opening 36, and a collar member 22 welded to the top and bottom head members by a weld 28 extending around a portion 26 and with an end extending through the end of the cylindrical body portion 24 of the collar member; a plurality of furnace tubes 18 attached to the cylindrical portion of the collar member, the outer surface of which is lined with glass 29;
a furnace barrel (18) welded to the collar member (22) by a weld (30) extending around an end of the cylindrical body portion (24) of the collar member (22). 2. An assembly according to claim 1, in which the cylindrical body portion 2 of the collar member 22
The longitudinal length of 4 is such that the weld 30 applied to the end of the cylindrical body is sufficiently spaced from the glass lining 29 on the inner surface of the top and bottom head members such that the heat generated by the weld 30 damages the glass lining. Water heater tank assembly that is long enough to avoid. 3. The water heater tank assembly of claim 2, wherein the cylindrical body portion 24 of the collar member 22 has a minimum length of approximately 13/16 inches. 4. The assembly of claim 1, wherein said top and bottom head members 14, 16 are slidably fitted within said shell 12 and extend downwardly and upwardly away from the interior of said shell. said top and bottom head members 1
4, 16 are welded to the shell by welds 34 extending around the ends of the flanges of the head members, the length of the flanges 32 of the top and bottom head members 14, 16 The heat generated by the weld 34 around the edge of the outer shell 12
and a water heater tank assembly long enough to avoid damaging the inner glass lining 29 of the top and bottom head members 14,16. 5. The water heater tank assembly of claim 4, wherein the minimum length of the flanges 32 of the top and bottom head members 14, 16 is approximately 73 cm.
The water heater tank assembly is 2-7/8 inches. 6 A method of fabricating a water heater tank assembly whose inner surface is glass-lined 29, comprising: (1) a plurality of collar members 22 having a cylindrical flange portion 26 and a cylindrical body portion 24 extending from the flange portion; , the flange part 2
6 is located facing the water-contacting side of the top and bottom head members 14, 16, and the cylindrical body portion 24 extends to a point above and below the outer surface of the top and bottom head members for tube mounting. attached to the tube mounting openings 36 of the top and bottom head members so as to extend through the openings 36; and (2) welding the flange portions 26 of each collar member 22 to the inner surfaces of the top and bottom head members 14, 16. [3] A glass lining 29 is applied to the water-contact sides of the top and bottom head members to which the collar member 22 is welded, and [4] A glass lining 29 is applied to the inner surface of the outer shell member 12 in advance. Press-fitting the top and bottom head members 14, 16 into both ends; [5] the top or bottom head members 14, 1;
6 to the outer shell 12; [7] a cylindrical body portion 24 of the collar member 22;
[8] Depending on whether the top head member 14 or the bottom head member 16 was welded to the outer shell 12 in step [5], the bottom head member 1 is welded to the outer shell 12.
6. A method of manufacturing a water heater tank assembly, which includes the step of press-fitting the top head member 14 into the outer shell 12 and then welding it by the same steps as in [6] and [7] above. 7. In the method according to claim 6, the welding 28 (step [2] above) of the flange portion 26 of the collar member 22 to the top and bottom head members 14, 16 is carried out around the flange portion 26. How to make a water heater tank assembly that extends. 8. In the method according to claim 6, the welding 30 (step [7] above) between the cylindrical main body 24 of the collar member and the furnace tube 18 is performed at the end of the cylindrical main body 24. A method of fabricating a water heater tank assembly that extends around a. 9. The method of claim 6, wherein the top and bottom head members 14, 16 have flanges 32 that slide within the shell 12 and extend upwardly and downwardly from the interior of the shell. death,
A water heater tank assembly in which the weld 34 between the top and bottom head members and the shell (steps [5] and [8] above) extends around the ends of the flanges 32 of the top and bottom head members. How to make solid objects.