JPH03279751A - Electric water heater - Google Patents

Abstract

PURPOSE:To reduce the height of an electric water heater and facilitate its installation work by locating a takeoff of a tank on a lower end plate or on a cylinder plate so that it is above a bottom portion of the lower end plate, and by discharging water in the tank through a drain pipe by which a siphon phenomenon is caused. CONSTITUTION:An electric heater 4 is attached to a lower side of a cylinder plate 2, and a water supply pipe 5 and a drainpipe 6 are attached to a lower end plate 3 of a tank. The water supply pipe 5 and the drainpipe 6 are closed to a bottom portion of the lower end plate 3 at the tips and connected to each other in the tank so that a lower end of an opening portion 7 is located on the lower end plate 3. Since water is downwardly supplied through the water supply pipe 5, it does not mix hot water in the tank, thereby making it possible to effectively use warm water. When water in the tank is discharged, a valve of the water supply pipe 5 and a valve of the drainpipe 6 are closed. Consequently, it is possible to discharge water in the tank by a siphon phenomenon until the water level reaches to the bottom of the tank. If the drainpipe should be chocked up, water is supplied from the water supply pipe to the drainpipe by water pressure so as to clean the drainpipe. If air is contaminated in the drainpipe and a siphon phenomenon can be generated, water is supplied to the drainpipe so as to water out air and to normalize the siphon phenomenon.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the structure of installing a water inlet and a drain in an electric water heater.

[Conventional technology]

As shown in Figure 3, the structure of the water supply and drain ports of a conventional electric water heater has a water supply pipe seat A and a drain pipe seat B at the bottom of the can body, and these are connected via an elbow C to the water supply and drain ports. It was connected to a pipe. In this method, the product height is Hinwn, and in particular, in a tank with a capacity of about 4.60 Q, there are cases where it becomes (Hl>ceiling height of the installation location).

In addition, baffles D are installed at the water supply pipe seat A and the drain pipe seat B to prevent the hot water in the tank from directly mixing with the supplied water during water supply.

In FIG. 3, E indicates the upper mirror, F the body plate, G the lower mirror, and H the heater.

Further, related structures of this type include, for example, Japanese Patent Application No. 1999-22980 and Japanese Patent Application No. 1-182659.

[Problem to be solved by the invention]

The above conventional technology is an electric water heater, and when the lower mirror is convex downward, the water supply pipe and drain pipe are taken out near the bottom of the lower mirror, so the height of the product is too large. In this case, especially for electric water heaters with a hot water storage capacity of about 460Q,
In cases where the height of the installation surface is close to the ceiling height and construction is difficult, or in extreme cases, the product height may be higher than the ceiling height of the installation surface.

The purpose of the present invention is to reduce the height of the product without changing the tank capacity of the electric water heater product, and by increasing the tank inner diameter, without increasing the installation area, thereby making the installation work easier. It is about providing the equipment.

[Means to solve the problem]

In order to achieve the above object, the present invention inserts a pipe near the bottom of the tank, and the connection port with the tank is a lower mirror or body plate above the bottom of the tank, and water is supplied from the bottom of the tank.
This eliminates drainage and reduces the height of the product.

[Effect]

Water inserted into the tank is supplied downward.

Therefore, since water is not supplied upwards as in the conventional example, hot water and water in the tank do not mix directly, and water can be supplied in a separated state, which is a characteristic of electric water heaters.

In addition, since the drainage opening is located near the bottom of the tank mirror, most of the water in the tank can be drained out using a siphon effect when draining.

In addition, if either the water supply or drainage is the water supply port,
The other can be a drain.

In addition, by connecting the water supply and drainage pipes inside the tank, water enters through the opening during normal use, so no scale builds up around it, and the drain pipe does not get clogged when draining water. In addition, even if water is blocked, you can easily clean the drain pipe by supplying water from the water inlet.Furthermore, with siphon drainage, even if air accumulates in the drain pipe and the siphon effect is not effective, you can use the water inlet to clean the drain pipe. A siphon effect can be easily achieved by supplying water and discharging air.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 denotes an upper head plate forming a tank of an electric water heater, 2 a body plate, and 3 a lower head plate.The body plate 2, the upper head plate 1, and the lower head plate 3 are welded together.

An electric heater 4 is attached to the lower side of the body plate 2, and a water supply pipe 5. The drain pipe 6 is welded to the lower head plate 3. The tips of the water supply pipe and drain pipe 6 touch the bottom of the lower mirror.
or are placed in close contact.

In Figure 2(a), the water supply pipe 5 and the drain pipe 6 are connected inside the tank, the lower end of the opening 7 is in contact with or nearly in contact with the lower mirror, and the upper end of the opening 8 is connected to the bottom of the lower mirror. It is arranged within 30mm from. Also, in Figures 1 and 2(a), the water supply pipe 5. The drain pipe 6 can be reversed.

With this configuration, water is supplied downward to the water supply pipe 5, so that the hot water can be effectively used without mixing with the hot water in the tank.

Further, when draining the water in the tank, by closing the valve of the water supply pipe 5' and opening the valve of the drain pipe 6', water can be drained to the bottom of the tank by a siphon effect.

Furthermore, as shown in Fig. 2(a), by connecting the water supply pipe and the drain pipe inside the tank, scale etc. will not accumulate near the connected opening, and when draining the water inside the tank, It can prevent drain pipes from becoming clogged with scale, etc.

In addition, even if the drain pipe becomes clogged, it is possible to clean the drain pipe by guiding the water supply from the water supply pipe using water pressure. Furthermore, since the drain pipe drains water using a siphon phenomenon, if air gets mixed into the drain pipe due to some phenomenon, the siphon phenomenon may not occur and the drain function may stop.

Even in this case, by introducing the water supply, the air in the drain pipe can be discharged, the siphon phenomenon can be normalized, and the drain can be drained.

Furthermore, in FIG. 2(a), the distance from the upper end of the opening 8 to the bottom surface of the lower mirror is within 30+nm, so that the amount of water remaining after draining can be reduced.

Further, as shown in FIG. 2(b), by providing a partial recess at the bottom of the lower mirror, the amount of water remaining after draining can be minimized.

〔Effect of the invention〕

According to the present invention, the water supply and drain pipes of the electric water heater can be taken out from the lower mirror or the body plate without having to be taken out from the bottom of the product, so the height of the product is reduced, making it possible to downsize the product and making it more economical. Moreover, the installation work becomes easier.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of an electric water heater showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the lower part of a tank showing an embodiment of the invention, and Fig. 3 is a longitudinal sectional view of a conventional electric water heater. It is a front view.

Claims (1)

[Claims] 1. In an electric water heater in which a tank is constituted by a body plate, upper and lower mirror plates, and the lower mirror has a downwardly convex shape, the water supply and drain pipes are connected from near the bottom of the tank at the bottom of the lower mirror. A pipe is used to take out the tank, and the tank outlet is set to the lower mirror or the body plate above the bottom of the lower mirror, and the water in the tank is drained by siphoning from the drain pipe. An electric water heater featuring