JPH0754760Y2 - Thin water heater - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Use) The present invention relates to an electric water heater which is mainly used at home and is directly connected to water to supply water.

(Prior Art) A tank of an electric water heater that has been conventionally used has a cylindrical shape or a rectangular tube shape.

(Problems to be solved by the invention) This kind of electric water heater has a tank volume of about 360 l, and when the height of the tank is 180 cm, the outer diameter is about 51 cm for a cylindrical tank and one side for a square tubular tank. The length is about 45 cm, and since the outer surface of the tank is covered with heat insulating material, the outer shape of the water heater is considerably large. And the installation location of this water heater is supposed to be along the corner or wall surface of the residential building, but there is little room in the building itself and the size of the water heater protruding from the wall surface is large. It is often difficult to select a place.

Of these, the rectangular tubular tank is dimensionally advantageous over the cylindrical tank, and it is more advantageous if the cross section is rectangular, but in any case, the pressure resistance is inferior to the cylindrical tank, It is easily deformed even under normal water pressure, and means for reducing the water pressure must be used, which makes it expensive.

In addition, since both cylindrical and rectangular tanks have even smaller resistance to external pressure, if water heaters are installed on the upper floors and the water supply is cut off and negative pressure is generated due to the head, the tank will collapse. May occur.

Therefore, it is an object of the present invention to obtain an electric water heater which has a small size protruding from the wall surface even when installed along the wall surface and has a large withstand pressure.

(Means for Solving the Problem) A first means for solving the above problems in the present invention is a pair of symmetrical shells made of a plate material, and a plurality of vertical tubes each having a circular cross section and reduced at both ends. A small-diameter communication path is formed to connect both ends of adjacent vertical pipes, and a tank integrally formed by welding the outer peripheral portions of both shells and an intermediate portion along the vertical pipe is provided, and an electric heater is provided below the inside of the tank. The second feature is that
The solution means is to insert the upper and lower ends of a circular tubular vertical pipe into the respective pipe holes of a pair of flange plates in which a plurality of pipe holes are formed as an example, weld them, and connect the flange plate to the vertical pipe connection side. On the side of, a tank is integrally provided by welding an end plate having a semicircular cross section in the width direction and reduced at both ends in the longitudinal direction, and an electric heater is provided below the inside of the tank.

(Operation) According to the first solution means, since the small-diameter vertical pipes are arranged in a line, the depth dimension of the tank becomes small, and the vertical pipes have a small diameter, so that the pressure resistance becomes large. Then, by heating the electric heater installed inside the tank, the water rises in the vertical pipe, enters another vertical pipe from the upper connecting passage, descends, and returns to the original vertical pipe. To do.

Further, also in the second solving means, the depth dimension of the tank,
The withstand pressure is the same as that of the first one, and the water is heated by an electric heater installed in the vertical pipe or in the end plate to perform the same circulation and temperature rise.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
In the first embodiment of FIGS. 5-5, 1 is a thin water heater, 2
Is a tank, 3 is a water supply port, 4 is a hot water outlet, 5 is an electric heater installed in the lower part, and 6 is an outer box surrounding the tank 2 with a heat insulating material.

The tank 2 has two symmetrical shells 7, which are formed by pressing a stainless steel plate having a thickness of 0.8 to 1.0 mm, which is usually used.
3 made by welding 7 and having a circular cross section by both shells 7,7
A vertical pipe 8 is formed, and the upper and lower ends 9 and 10 of the vertical pipe 8 are hemispherical, and the ends 9 and 9 or 10 and 10 of adjacent vertical pipes are communication paths 11 and 12 having a small diameter. The vertical pipes that are communicated and that surround them and have the outer circumference 13
The elongated joint 14 formed between 8 and 8 is seam welded by the roller electrode.

The inner surface of each shell 7 is shown in FIG. 5, and the vertical pipe half portion 8a and the connecting passage half portions 11a and 12a are recessed in a semicircular cross section, and the joint surfaces 13a and 14a are provided on the same plane. .

In this tank 2, the vertical pipe 8 has an outer diameter d of 30 cm and a height h.
Is 180 cm, the width B is 96 cm and the total volume is about 375 l, but the depth is 21 cm shorter than the cylindrical tank and 15 cm shorter than the cylindrical tank, and the minimum thickness of the heat insulating layer is If they are the same, this dimensional difference becomes the dimensional difference of the water heater as it is, and since it is thin, it becomes much easier to select the installation location.

Next, a second embodiment will be described with reference to FIGS.
The tank 21 of this thin water heater 20 has an outer diameter of 30 cm and a wall thickness of 0.8 mm.
The three vertical pipes 22 made of stainless steel round pipes are inserted into the pipe holes 25 and 26 of the upper and lower flange plates 23 and 24 and welded, and the end plates 27 and 28 are welded to the respective flange plates from the outside. , End plate 2
7, 28 has a semicircular cross section and both ends in the longitudinal direction are hemispherical, and the radius of curvature of each is approximately equal to the radius of the longitudinal pipe. An electric heater 5 is also installed inside the tank 21 as described above, and a water supply port 3 and a tap hole 4 are provided on the end plate. Like the tank 2, the tank 21 has a high pressure resistance and is thin.

In each of the above embodiments, the vertical pipes 8 or 22 are three, but the number can be changed according to the conditions of the installation location, and the outer diameter of each vertical pipe can be changed accordingly.

(Effect of the invention) As described above, in the inventions of claims 1 and 2, since the water heater can be made thin with a small depth dimension, the installation location can be easily selected, and the corners of the building or It has the advantage that it can be placed out of the way along the wall surface, and a small volume can be wall-mounted.

Moreover, since the inner diameter of the vertical pipe is small, the strength against positive pressure and negative pressure is large without increasing the wall thickness, and there is no need for pressure reducing means even in areas where water pressure is particularly high. Even if it is installed in, there is an effect that it does not collapse due to negative pressure when water is cut off.

Further, since the portion connecting the vertical pipes is formed to be short, heat dissipation in the connecting portion is small.

Moreover, according to the invention of claim 1, a complicated tank having a plurality of vertical pipes and a connecting path for connecting the vertical pipes can be formed by using one type of mold, and the shells are formed after the forming process. Since it only needs to be welded, it has the advantage of high production efficiency.

Further, according to the invention of claim 2, the molding processing portion is only a relatively small end plate, and the end plate can be processed by one type of molding die having a small size and a simple structure. By using and, the end portion of the vertical pipe is closed and the communication passage is formed, and it is not necessary to separately provide the communication passage, so that there is an advantage that the die cost and the processing cost are low.

[Brief description of drawings]

1 to 5 show a first embodiment, FIG. 1 is a front view,
FIG. 2 is a sectional view taken along the line II, FIG. 3 is a plan view, FIG. 4 is a perspective view, FIG. 5 is a shell internal view, and FIGS. 6 to 8 show a second embodiment. The figure is a vertical front view, FIG. 7 is a perspective view, and FIG. 8 is an exploded perspective view. 1,20 ... Thin water heater, 2,21 ... Tank 5 ... Electric heater, 7 ... Shell 8,22 ... Vertical pipe, 11,12 ... Communication path 13,14 ... Joint part, 23,24 ... Flange plate 27, 28 ... End plate

Claims (2)

[Scope of utility model registration request] 1. A pair of symmetrical shells made of plate material, which form a plurality of vertical pipes each having a circular cross section and reduced at both ends, and a small-diameter connecting path connecting both ends of an adjacent vertical pipe. A thin water heater comprising a tank in which an outer peripheral portion of both shells and an intermediate portion along a vertical pipe are welded and integrated, and an electric heater is provided below the inside of the tank. 2. The upper and lower ends of a cylindrical tubular pipe are inserted into and welded to the respective tubular holes of a pair of flange plates having a plurality of tubular holes formed in a row, and the flange plate is opposite to the vertical pipe connecting side. A thin water heater, characterized in that a tank integrally formed by welding an end plate having a semicircular cross section in the width direction and reduced at both ends in the longitudinal direction is provided on the side of, and an electric heater is provided below the inside of the tank.