JPS6127446A - Electric hot water apparatus - Google Patents

Abstract

PURPOSE:To improve the corrosion resistance and heat insulation of the apparatus by forming the main body of a hot water storage tank into a dividing and assembling type with a ceramic material. CONSTITUTION:Flanges 5 are integrally formed at the upper end of a vessel drum part 18, and a fitting hole 19 for loading a supply water pipe 10 is formed on the lower leve side. Between a flange part 10' of a feed water pipe 10 and a nut 20 screwed thereto, is clamped a mouth edge part of the fitting hole 19 via a packing. Furthermore, on the other side of the vessel drum part 18 is formed an insertion port 21 into which is inserted a heater 22. The mounting flanges formed on the base peripheral side of the heater 22 is fitted into the side wall of the vessel drum part 18 by means of a bolt in a watertight manner. Furthermore, a upper lid 23 on which fitting flanges 6 are provided, are fitted to the upper end open part of the vessel drum part 18 in a watertight manner, and a mounting port 23' which mounts a feed water pipe 17 is formed at the central part of the upper lid 23. A heat insulating material 2 is filled between a main body 3 of a hot water storage tank thus contructed and an armoring plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a non-pressurized stationary electric water heater for use in general homes and other places.

<Prior Art> A conventional electric water heater is shown in Fig. 5. The electric water heater has a tank body 3a made of stainless steel or other steel plate,
A hot water supply pipe 17a and a water supply pipe 10a are inseparably and closely connected to the tank body 3a at the upper and lower parts, respectively, and a heater 22 is inserted in the lower part of the tank body 3a to maintain it watertightly. The inner surface of the tank body 3a is uniformly anti-rust treated with a glass lining 13, and an anti-corrosion electrode 14 is attached to the side wall of the tank body 3a to enhance the rust prevention effect of the tank body, and the tank body 3a and the exterior plate are A heat insulating material 2 was filled in the opposing gap formed between the heat insulating material 2 and the heat insulating material 2.

Here, in the above conventional example, a glass lining is applied to the inner surface of the tank body 3a in order to prevent rusting due to long-term use of the tank body 3a, but even so, there are usually pinholes in the glass lining. However, erosion gradually progresses from this part.

In order to prevent corrosion and rust from forming through pinholes in the glass lining, an anti-corrosion electrode 14 is further inserted into the tank.
A constant potential was applied between the anti-corrosion electrode (positive electrode) and the tank body 3a (negative electrode) from a power supply circuit (located between the exterior plate and the tank body, not shown). Therefore, anti-corrosion electrodes and a power supply circuit are required, which complicates the configuration accordingly.

In addition, in this way, the conventional tank body itself requires several processing steps such as can manufacturing process, welding process, and glass lining treatment on the inner surface of the tank body. However, the anti-corrosion effect of glass lining is still not perfect, and a method to prevent pinholes from occurring by attaching anti-corrosion electrodes is required, which increases production costs and prevents glass lining from being exposed to hot water. It has the disadvantage that it decomposes and gradually changes, and its rust prevention effect deteriorates.

<Problems to be Solved by the Invention> An object of the present invention is to improve corrosion resistance and heat retention by changing the material of the hot water storage tank body that constitutes the water heater.

<Means for Solving the Problems> In the electric water heater of the present invention, the hot water storage tank body is made of a ceramic material and is composed of a plurality of assembled parts in a shape that is most easily molded.

<Example> Hereinafter, the example shown in the drawings will be described in detail. The illustrated hot water tank body 3 is a container body 1 formed into an arbitrary shape such as a cylindrical shape or a rectangular tube shape using an alumina ceramic material or other suitable ceramic material with good thermal properties such as heat resistance and heat insulation.
8 and an upper lid 23 made of the same material.

That is, the flange 5 is integrally connected to the upper end of the container body 18, and an attachment hole 19 for attaching the water supply pipe 10 is formed on the lower side of the container body 18. Runno part 10
and the nut 20 screwed thereto, the mounting hole 1 is opened.
The mouth edge of the container 9 is sandwiched with a gasket, and an insertion opening 21 into which a heater 22 is inserted is formed on the other side of the container body 18, and an insertion opening 21 is formed on the circumferential side of the base of the heater 22. The mounting flange and the side wall of the container body 18 are watertightly attached with bolts.

On the other hand, on the open upper end of the container body 18, a top lid 23 having an attachment 7 flange 6 connected to the periphery is attached to the flange 5 of the container body 18 with the attachment flange 6 on the periphery thereof. , watertight bond,
Attachment port 2 for attaching the hot water pipe 17 to the center of the upper lid 23
3", and the rim of the installation opening 23" is held and fixed in a watertight manner by the 7-run part 17" of the hot water supply pipe 17 and the nut 20 screwed onto the hot water supply pipe 17 from both sides. .

A heat insulating material 2, such as foamed urethane or glass wool, which has excellent heat insulation and cushioning properties, is inserted between the hot water storage tank body 3 constructed as described in Section 2 and the exterior plate 1 surrounding the hot water storage tank body 3. Moreover, an electric water heater is constructed by taking out the water supply pipe 10, the hot water supply pipe 17, the power supply line to the heater, etc. to the outside of the exterior plate 1, respectively.

Next, in the above embodiment, the water supply pipe 10, the hot water supply pipe 17
In order to attach it to the container body 18 or top lid 23, a 7 flange 10' or 17' formed at the end of the water supply pipe 10 or hot water supply pipe 17 and a nut screwed onto the container pipe 10, 17 are used. 20
Although the container body 18 or the top cover 23 is installed by sandwiching the mounting opening edge of the container body 18 or top lid 23 when opening the container, the mounting configuration is not limited to this, and the mounting configuration shown in FIGS. 2 and 4 may also be used. . That is,
The one shown in FIG. 2 has a water supply port 25 on the side of the container body 18.
The case is shown in which a required number of nuts 7 having mounting screw holes are installed in advance around the water supply port 25 using inserts, and the end 7 flange of the water supply pipe 10 is attached to the inserted nut 7. The water supply pipe 10 is attached to the container body 18 by inserting the attachment ports 1 and 11 through the gasket 9 through the packing 8.

Moreover, what is shown in FIG. 3 is a case in which the base of the water supply pipe 10 is directly attached by an insert when forming the container body 18 together with the seven flange 12 formed at the end of the water supply pipe 10. In the example shown in FIG. 4, a water supply port 25, an outer flange 16, and a mounting bolt hole 24 for the water supply pipe 10 are simultaneously formed on the side wall of the container body 18, and in this case,
The seven flange 9 formed at the end of the water supply pipe 10 is connected to the container body 1.
8 through the packing 8, and the container body 1
A bolt 15 is inserted into the 7 flange 9 of the water supply pipe 10 from inside the container 8 through the bolt hole 24, and is tightened with a nut to fix the water supply pipe 10 to the container body 18.

Incidentally, the examples shown in FIGS. 2 to 4 above are all cases in which the water supply pipe 10 is attached to the container body 18, but the same procedure can be applied to the case in which the hot water supply pipe 17 is attached to the upper lid 23. I can do it. Furthermore, although the above structure is constructed by horizontally dividing the upper lid and the container body, it may also be divided vertically in the center or assembled into several parts at other appropriate places.

<Function> Next, the function of the hot water storage tank having the above configuration will be described. First of all, an electric water heater is a small device with an internal capacity of about 12 to 14 F liters, and is installed in a type, so the water supply pipe 10
After connecting the hot water supply pipe to the hot water mixing faucet and filling the hot water storage tank with water, power is applied to the heater 22. Eventually, hot water at a predetermined temperature (85 ['C] upper limit) will be supplied. At that point, the automatic temperature controller operates and stops energizing.

Therefore, in the present invention, since a water flow control valve is interposed in the water supply pipe, a non-pressurized piping system is adopted in which no pressure is applied in the hot water storage tank even if the water supply is stopped. Even if the hot water storage tank body 3 is made of a relatively brittle material such as ceramic, -4
It can be used as a container.

In use, by opening the hot water supply faucet of the hot water mixing faucet, new water is replenished from the water supply pipe 10, and the hot water in the tank body 3 is pushed out from the hot water supply pipe 17 by this replenishment water pressure, and the hot water is It is sent to a mixing faucet, where it is mixed with water and supplied as warm water at an appropriate temperature.

<Effects of the Invention> The present invention has the above-mentioned structural action, and the hot water storage tank body is made of ceramic material in a split assembly type, so even after long-term use, pinholes and pinholes in the glass lining will not occur as before. , there is no need for anti-corrosion electrodes installed to prevent corrosion due to deterioration of the glass lining due to thermal changes, and there is no accompanying power supply circuit, making the configuration extremely simple and low cost. In addition, the amount of electricity is reduced, and because of the use of ceramic, there is no deterioration like with glass lining, and compared to the conventional hot water storage tank body made of a combination of steel plate and glass lining, it is stronger against mechanical shock. It has high heat resistance, simple structure, and good insulation properties.
It is possible to provide an electric water heater that has high corrosion resistance and can be used for a long time.

[Brief explanation of drawings]

Fig. 1 is a vertical side view of the electric water heater of the present invention, Fig. 2 is a partially enlarged sectional view showing an example of a modification of the attachment part between the water supply device and the hot water storage tank, and Figs. 3 and 4 are both A partial cross-sectional view showing another embodiment of the same as above. FIG. 5 is a longitudinal cross-sectional view of a conventional electric water heater. 3...Hot water storage tank body 10...Water supply pipe 17...Hot water supply pipe 22...Heater

Claims (1)

[Claims] In a water heater comprising a hot water tank main body having a hot water supply pipe in the upper part and a water supply pipe in the lower part and a heater inserted therein, the hot water tank main body is configured to be separably joined with ceramics,
1. An electric water heater, characterized in that the water tank is assembled in a water-tight manner through a packing at the joint, and the outer periphery of the hot water tank body is surrounded by a heat insulating material.