JPS5940008B2 - Containers such as water heaters - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bottomed container for use in water heaters, etc., and the container is obtained by welding a plate body and a dish-shaped bottom plate to the base metal, and this welding is extremely easy. This ensures reliability and improves corrosion resistance.

Conventionally, the bottom of this type of container was made by overlapping the cylindrical body A and the bottom plate opening, and welding the end C to the base metal, as shown in FIG.

In this case, since a gap 2 is created in the overlapping portion, even if stainless steel material is used, there is a drawback that crevice corrosion occurs in the core portion when boiling water or the like.

In order to eliminate this crevice corrosion, there is a method of butting the flange part E of the cylinder body A and the end face of the bottom plate opening as shown in Figure 6, and welding the butt part. As shown, the wall thickness of the welded part a is thinner than other parts, so fine particles tend to form on the rack during cooling after melting, and the welded part is easily corroded, and there is a slight gap at the butt part. Therefore, it has the drawback that holes tend to occur during electric arc welding, making the work extremely difficult.

The present invention overcomes these drawbacks.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A pressure pouring type electric water heater will be described below as an embodiment of the present invention with reference to FIGS. 1 to 4.

In FIG. 1, 1 is an outer body, and this outer body 1
A rubber backing 4 is attached to the step 3 of the spout 2 placed on the upper end of the
A cylindrical container 5 with a bottom is attached via the mounting bracket 6.
is screwed to the bottom cover 7.

8 is a water level gauge provided through the side wall of the container 5;
is a heating element attached to the outer peripheral surface of the lower part of the container 5.

10 is a thermostat that controls energization of the heating element 9; 11;
is the temperature fuse.

Reference numeral 12 designates an upper lid, inside which a bellows pump 13 is installed, air pressed by a push plate 14 is sent into the container 5 via an inner lid 15, and hot water in the container 5 is pumped through a suction pipe 16 and a discharge pipe 17.
It is configured to pour out through the water.

18 is a seal backing. The container 5 is made of plate material rolled into a cylindrical shape, the seam 19 is arc welded, and the container body 21 has a flange portion 20 formed by bending the entire circumference of the lower end face inward in a cross-sectional shape. It is formed from a bottom plate 22 drawn into a dish shape.

To connect the melter body 21 and the bottom plate 22, the rising wall 24 of the bottom plate 22 is engaged with the end face 23 of the flange part 20 of the container body 21, and the upper end face 25 of the rising wall 24 is connected to the flange part 2.
0, and when the core portion is welded to the base metal by arc welding or the like, the upper end of the rising wall 24 melts, and the end face 23 of the flange portion 20 is also melted and welded to the base metal.

As a result, the wall thickness A of the welded portion 26 is formed to be thicker than the plate thicknesses of the container body 21 and the bottom plate 22, as shown in FIG.

Therefore, there are no gaps on the inner surface of the container 5 as in the conventional example, and since the container 5 has a sufficient wall thickness, welding cracks do not occur when melting and solidifying.

In addition, the plate materials of the container body 21 and the bottom plate 22 contain 0.02 carbon.
A stainless steel plate containing 0.5 to 2.5% of molybdenum and 0.2 to 10% of niobium or titanium is used in an extremely low carbon ferritic stainless steel containing 15 to 19% of chromium.

This has the effect that corrosion resistance does not deteriorate even when heated by welding.

In the above embodiment, the welded portion between the container body and the bottom plate was engaged at the bottom surface, but the welded portion was engaged at the side surface of the container body.
It's a good thing.

The key point is that when engaging the container body and the bottom plate, by providing an overlap so that one side protrudes, this overlap melts and increases the thickness of the welded part. The section is not limited to the examples.

As is clear from the above description, the container of the present invention, such as a water heater, has no gaps at the bottom, has extremely good corrosion resistance, and has great industrial value.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway sectional view of an electric water heater using a container showing one embodiment of the present invention, Fig. 2 is a perspective view of the same container, and Fig. 3 is an enlarged sectional view of essential parts of the same container. , FIG. 4 is a sectional view of a main part showing one manufacturing process of the same container, and FIGS. 5, 6, and 7 are partial sectional views of a conventional container. 5... Container, 20... Flange part, 2
1... Container body, 22... Bottom plate, 26
······welded part.

Claims (1)

[Claims] 1 The plate is formed into a cylindrical shape, and the lower end of the container body, which is welded to the base metal at this seam, is engaged with the outer periphery of the bottom plate of the plate, with an overlap margin, and this retaining part is welded to the base metal. A container such as a water heater, in which the welded portion is thicker than the container body or bottom plate.