また、この他の従来例として、図８〜図１０に示すような構造があった。
図８に示すものは、鏡板２の端部に形成した拡径部２ｂの内面に胴板４の端部４ｂを突き合わせて、その突き合わせ部を缶体１の内側より周溶接１２したもの。図９に示すものは、胴板４の端部に拡径部４ｃを形成し、その内面に鏡板２の端面２ｃを突き合わせて内側から周溶接１２してたもの。さらに、図１０に示すものは、鏡板２の端部を拡径した後、さらにテーパ加工した突起２ｄに同じく拡径した胴板４の端部４ｄを突き合わせて、この突き合わせ部を外側より周溶接１２したものである。
Further, as another conventional example, there is a structure as shown in FIGS. 8 to 10.
In FIG. 8, the end portion 4b of the body plate 4 is abutted against the inner surface of the enlarged diameter portion 2b formed at the end portion of the end plate 2, and the abutting portion is peripherally welded 12 from the inside of the can body 1. In the one shown in FIG. 9, a diameter-expanded portion 4c is formed at the end of the body plate 4, the end surface 2c of the end plate 2 is abutted against the inner surface thereof, and the peripheral welding 12 is performed from the inside. Furthermore, as shown in FIG. 10, after the enlarged diameter end portion of the end plate 2, further against the end 4d of the tapering and shell plate 4 which is also expanded to the protrusion 2d has, peripheral than the outer butt end of this It is welded 12.
【００１１】
【発明の実施の形態】
実施の形態１.
以下、本発明の実施の形態１を図面に基づき詳細に説明する。
図１は本発明の実施の形態１を示す電気温水器用缶体の断面図であり、１は缶体で、上部鏡板２、下部鏡板３、及び胴板４で構成されている。５は冷水が供給される給水管座、６は胴板４に配設したヒータ取付口、７は電気ヒータ、８は温水が流出される出湯管座である。９は缶体脚１０の取付座で、下部鏡板３に溶接等で取り付けられている。
上記胴板４は、本実施の形態１においては、材質は厚さ０．８〜１．５ｍｍ程度のステンレスの鋼板を円筒状にして継目をＴＩＧ溶接等により溶接することで製作している。また胴板４の直径Ｄ１は上下部鏡板２，３のストレート部の直径Ｄ２に対して約３〜５ｍｍ程度小さくなるように製作している。
0011
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1.
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a can body for an electric water heater showing the first embodiment of the present invention. FIG. 1 is a can body, which is composed of an upper end plate 2, a lower end plate 3, and a body plate 4. 5 is a water supply pipe seat to which cold water is supplied, 6 is a heater attachment port arranged on the body plate 4, 7 is an electric heater, and 8 is a hot water discharge pipe seat to which hot water flows out. Reference numeral 9 denotes a mounting seat for the can body leg 10, which is attached to the lower end plate 3 by welding or the like.
In the first embodiment, the body plate 4 is manufactured by forming a cylindrical stainless steel plate having a thickness of about 0.8 to 1.5 mm and welding the seams by TIG welding or the like. Further, the diameter D1 of the body plate 4 is manufactured so as to be about 3 to 5 mm smaller than the diameter D2 of the straight portion of the upper and lower end plates 2 and 3.
実施の形態３．
図４は実施の形態３を示す要部拡大断面図である。
この実施の形態３では、胴板４の端部に円筒方向内側に向かってテーパ状の縮径部１３を形成することで、鏡板２，３のストレート部の外径Ｄ２より内側に周溶接部１２の位置を配置しており、上記実施の形態１及び２と同等の効果を得ることができるほか、胴板４の直径Ｄ１を小さくする必要がないので、缶体１の容量を落とさずに実施できる。
Embodiment 3.
FIG. 4 is an enlarged cross-sectional view of a main part showing the third embodiment.
In the third embodiment, by forming a tapered diameter-reduced portion 13 inward in the cylindrical direction at the end of the body plate 4, a peripheral welded portion is formed inside the outer diameter D2 of the straight portion of the end plates 2 and 3. the position of the 12 have been placed, in addition to it is possible to obtain the same effect as the first and second embodiments, it is not necessary to reduce the diameter D1 of the body plate 4, without reducing the capacity of the boiler body 1 Can be carried out.
実施の形態４．
図５は実施の形態４を示す要部拡大断面図である。
この実施の形態４では、胴板４の端部に階段状の縮径部１４を形成することによって周溶接部１２の位置を鏡板２，３のストレート部の外径Ｄ２より内側に周溶接部１２の位置を配置しており、この実施の形態４においても、上記実施の形態３と同様の効果が得られる。
Embodiment 4.
FIG. 5 is an enlarged cross-sectional view of a main part showing the fourth embodiment.
In the fourth embodiment, the circumferential welds inside than the outer diameter D2 of the straight portion of the end plate 2, 3 the position of the circumferential weld 12 by forming a stepped reduced diameter portion 14 on the end portion of the shell plate 4 Twelve positions are arranged, and the same effect as that of the third embodiment can be obtained in the fourth embodiment.
