JPH09152183A - Square type electric water heater with water-discharging emergency valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a square type electric water heater which is simple in constitution and which at the time of actual use enables drawing off water, etc., without waste, not to mention practicality by checking in a sure manner even in case of an emergency. SOLUTION: This square type electric water heater 200 has a tank containing a heater which is heated by electricity, a water-discharging emergency valve on the outer side of the tank, and a square type cover 240 enclosing the water- discharging emergency valve and the tank. A small door 241 is provided at a part of the square type cover 240, opposed to the water-discharging emergency valve. To the back side of the small door 241 the forward end of the water- discharging hose on the side of the water-discharging emergency valve is connected and, when the small door 241 is opened, the forward end of the water- discharging hose is exposed outside the square type cover 240.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater having a rectangular outer shape, and more particularly, to an electric water heater having an emergency water discharge valve for taking out water or hot water existing in a tank to an outside in an emergency. Type electric water heater.

[0002]

2. Description of the Related Art An electric water heater actively uses nighttime electric power, which has helped to improve the situation of electric energy in recent years. In addition, this type of electric water heater was previously often installed outdoors, but in recent years it has been often installed indoors or in a part close to the room. The need to make it square like general furniture is also increasing.

In order to make the outer shape of the electric water heater square, it is generally necessary to enclose the round tank with a square cover. The tank used in this type of electric water heater stores hot and cold water within a certain height range, so it must be shaped to withstand a certain level of pressure. Must be easy. In addition, tanks that will be used for many years must have excellent durability and quality. For this reason, the tank used in this type of electric water heater must be absolutely round. Therefore, in order to make this type of electric water heater a square type that can be installed indoors, the outer periphery of the tank, which must be round, must be surrounded by a square cover.

On the other hand, in recent years, domestic water, mainly drinking water, is usually supplied and used through water supply facilities, and electric water heaters also use water supplied from water supply. It is. Therefore, for example, when a natural disaster such as an earthquake occurs, the water supply equipment breaks down and the supply of tap water is stopped. If the tap water stops, drinking water and other domestic water will not be supplied at all, and civilian life will be greatly affected. Especially,
Drinking water is indispensable even for one day, and when the water supply stops, running a water truck requires a publicly large business, and it must be prepared on a regular basis. However, preparing various facilities for such an emergency is a very expensive problem, and it is very difficult to distribute drinking water sufficiently and within a short time by a water truck.

[0005] Based on the above-mentioned situation, the present inventors have thought about a good method, and have noticed the water or hot water existing in the tank of the electric water heater described above. In other words, even if the supply of tap water is stopped due to the occurrence of an earthquake or the like, tap water that has been constantly supplied, that is, water that can be used as emergency water remains in the tank. I wondered if this could be used.

Of course, as shown in FIG. 1, the electric water heater 200 is provided with a discharge valve 240 used for cleaning the inside of the tank 210. However, there is nothing that cannot be done if water or the like in the tank 210 is to be taken out. However, since the discharge valve 240 is constructed so that it can be discharged into a drainage channel (not shown), when trying to obtain water using it, the drainage channel is destroyed and the discharge valve 240 is exposed. This discharge valve 240 cannot be used easily because there is no room to do such work in an emergency. Moreover, since the discharge valve 240 is for discharging sand, rust, and the like stored in the tank 210 together with water, the water or the like coming out of the discharge valve 240 is used as it is as emergency water. It can hardly be used.

If the water or the like in the tank 210 is completely drained by using the discharge valve 240, the heater 230 in the tank 210 is exposed to the air. , The heater 23
0 will be overheated and damaged. Electric water heater 2
Since the energization of the heater 230 and its shutoff are controlled by a sensor that detects the temperature of the water in the tank 210, if the sensor detects the temperature of air instead of water, it is eligible. Heater 230
This is because the power supply to the power supply is not cut off.

For this reason, the applicant has already proposed an emergency water discharge valve by making the water or hot water in the electric water heater usable as emergency water, for example, in Japanese Patent Application No. Hei 6-144517. However, it has become necessary to apply this to a rectangular electric water heater having a rectangular cover. However, if this type of emergency water discharge valve is to be applied to a square electric water heater as it is, this emergency water discharge valve must be housed in a rectangular cover, and its existence is completely invisible from the outside. Become. Furthermore, in an emergency, it is considered that the presence of the emergency water discharge valve is considered to be unnoticed even in the presence of the emergency water discharge valve.

[0009] Further, if a disaster such as an earthquake occurs and the supply of water is stopped, the water in the electric water heater becomes very valuable, and is wasted when using the emergency water discharge valve. It is necessary to keep it from becoming. Therefore, when the emergency water discharge valve is used, it is necessary to ensure that water or the like in the electric water heater can be taken out of the rectangular cover.

Therefore, the present inventor, when adopting an emergency water discharge valve in this type of square electric water heater, can easily confirm its existence even in an emergency, and can surely use the water discharge valve. As a result of various studies on what to do, the present invention was completed.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a problem to be solved is to apply an emergency water discharge valve to a rectangular electric water heater.

That is, the object of the present invention is as follows.
It is a matter of course that the confirmation can be surely performed even in an emergency, and it is an object of the present invention to provide a square electric water heater having an emergency water discharge valve capable of taking out water and the like without waste during actual use with a simple configuration. .

[0013]

In order to solve the above problems, the means adopted by the present invention will be described with reference to the reference numerals used in the following embodiments. And an emergency water discharge valve 10 provided outside the tank 210.
0, and a rectangular electric water heater 200 including a rectangular cover 240 surrounding the emergency water discharge valve 100 and the tank 210.
And the emergency water discharge valve 100 of the rectangular cover 240
The opening / closing door 241 is provided in a portion facing the opening / closing door 241 and the tip of the water discharge hose 50 on the emergency water discharge valve 100 side is connected to the back side of the opening / closing door 241 to open the opening / closing door 241. The square type electric water heater 2 is characterized in that it is exposed outside the square type cover 240.
00 ”.

That is, the square electric water heater 2 according to the present invention
00 has a literally rectangular shape as shown in FIG. 1 by surrounding a round tank 210 having a built-in heater 230 with a square cover 240. An emergency water discharge valve 100 for taking out water or hot water from the tank 210 is provided.

In the rectangular electric water heater 200 of the present invention, the emergency water discharge valve 100 of the rectangular cover 240 is provided.
An opening / closing door 241 is provided at a portion opposite to the opening / closing door, and an emergency water discharge valve 1 is provided on the back side of the opening / closing door 241.
Water hose 5 connected to hose nipple 40
In this case, when the opening / closing door 241 is opened, the tip of the water discharge hose 50 automatically jumps out so as to open the outside of the square cover 240. It is.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rectangular electric water heater according to the present invention; FIG. Is shown. This square electric water heater 200 is shown in FIG.
As shown in FIG. 5, a round tank 210, a water supply pipe 220 necessary for the tank 210, and almost all of the emergency water discharge valve 100 connected to the water supply pipe 220 are housed in a square cover 240, and the The overall outer shape is a square shape like general furniture, and when installed in a room or a part similar thereto, there is no sense of incongruity with the surroundings.

That is, the square electric water heater 2 according to the present invention
Reference numeral 00 denotes a vertical type built-in tank 210 having a water volume of about 370 to 550 liters.
0 is built-in. And this tank 21
The tap water is constantly supplied to the inside of 0 by a water supply pipe 220 including an ascending pipe line 222 connected to the water pipe and a descending pipe line 221 connected to the bottom of the tank 210. is there. Of course, a hot water supply pipe (not shown) is connected to the upper end of the tank 210, and the electric water heater 200 uses the pressure from the water supply pipe 220 to supply the hot water stored in the upper part of the tank 210 to a predetermined amount. The hot water is supplied to the place. A discharge valve 240 is provided at the bottom of the tank 210. By opening the discharge valve 240, sand, rust and the like in the tank 210 can be discharged. , The above-mentioned water supply pipe 220 and the like are connected.

On the other hand, in this rectangular electric water heater 200, the water supply line 220 is connected to the descending line 221 and the ascending line 2
22 and a part of the water supply pipe 220 is
The value is set to be higher than 10 in order to prevent the water in the tank 210 from flowing back to the water pipe side when the water supply is cut off. In this embodiment, the emergency water discharge valve 100 is connected to the descending line 221 of the water supply line 220 as shown in FIG. That is, the water supply pipe 220 for the electric water heater 200 has a portion higher than the tank 210 formed in part thereof (so-called torii type pipe), and when the water supply is cut off, this water supply pipe The water in the tank 210 is prevented from flowing back into the water pipe by means of a safety valve with a negative pressure operated valve provided in the line 220. Therefore, this water supply line 22
0 is constituted by the ascending pipeline 222 and the descending pipeline 221.

The tank 210 and the water supply pipe 22 as described above
On the front side of the square cover 240 surrounding 0 and the like, there is provided a lid which can be fully opened, for example, as shown in FIG. 2, and this lid is removed as shown in FIG. Accordingly, the maintenance and inspection work after the installation can be easily performed as well as the installation of the internal tank 210, the emergency water discharge valve 100, and the like. And, for such a full cover, FIG.
As shown in FIG. 3, an opening / closing door 241 is provided. The opening / closing door 241 is of a type that opens downward as shown in FIG. It is preferable to use a type that opens to the side as shown in FIG. This is because it is convenient to take out water and the like from the water discharge hose 50 provided on the opening / closing door 241 while the opening / closing door 241 is open.

In other words, the opening / closing door 241 is housed in the rectangular cover 240 and is used to promote the presence of the emergency water discharge valve 100 which is difficult to confirm from the outside. Since it is opened to operate the water discharge valve 100, the square cover 2
40 must be formed in a portion facing the emergency water discharge valve 100 described later. If possible, as shown in FIGS. 1 and 2, it is optimal to provide the opening / closing door 241 at a position where human hands can sufficiently reach.

As shown in FIG. 1, on the front surface of the opening / closing door 241 which is always visible at normal times, the emergency water discharge valve 100 is opened when the opening / closing door 241 is opened. The description of what can be used, the actual usage of the emergency water discharge valve 100, etc.
Alternatively, if the periphery of the opening / closing door 241 is carefully surrounded by a color, the effect can be further enhanced.

On the back side of the opening / closing door 241,
As shown in (a) or (b) of FIG. 3, when the other end of the water discharge hose 50 having one end connected to the hose nipple 40 on the emergency water discharge valve 100 side is connected and the opening / closing door 241 is opened. In addition, the tip of the water discharge hose 50 is automatically oriented downward, for example. When the water discharge hose 50 is connected to the opening / closing door 241, in most cases, the water discharging hose 50 is housed in the rectangular cover 240. Considering that the tip of the water hose 50 must be reliably exposed to the outside of the square cover 240, it is preferable to stop only the tip of the water discharge hose 50 on the opening / closing door 241. In addition, taking into account that the water discharge hose 50 must be replaced due to aging, the water discharge hose 50 is required.
It is more advantageous to partially connect the back cover 241 to the back surface.

Now, regarding the emergency water discharge valve 100,
As the emergency water discharge valve 100, various ones can be adopted. In the present embodiment, the following ones are adopted.

FIGS. 4 to 9 show an emergency water discharge valve 100.
In one embodiment, the emergency water discharge valve 10 is shown.
0 is provided with a valve main body 10 as shown in FIGS. 4 to 7, and this valve main body 10 has a main pipe section 11 to which a switching valve 20a is to be provided as shown in FIG.
And the branch pipe section 12 where the water stop valve 30 is to be provided. The main pipe portion 11 is, for example, interposed in the descending pipe passage 221 in a state as shown in FIG. 6, and accommodates a three-way valve 21 described later to support and prevent it from coming off. Note that the locking portion 22a of the positioning plate 22 shown in FIG.
A projection is formed to regulate the rotation range of.

As described above, the three-way valve 21 is rotatably housed in the center of the main pipe portion 11 as shown in FIGS. It is housed in a liquid-tight manner via members. Further, in the center of the three-way valve 21, as shown in FIG. 8, a first water passage 23a for communicating the upper and lower sides of the downcomer pipe 221 at normal times (when the emergency water discharge valve 100 is not used),
A second water passage 23b branched from the center of the first water passage 23a to the opposite side of the branch pipe portion 12 is formed. In a normal state, the first water passage 23a is, as shown in FIG. The upper and lower sides of the path 221 communicate with each other, and one of the second paths 23 b is closed by the wall of the main pipe 11.

On the other hand, in an emergency (the emergency water discharge valve 10)
0 must be used).
Is rotated 90 ° counterclockwise from the state shown in FIG. 8A, so that one of the first water passages 23a is closed by the wall of the main pipe section 11, as shown in FIG. At the same time, the other communicates with the branch pipe portion 12 side of the valve body 10, and at the same time, the second water passage 23b is
It communicates with the downstream side of 21, that is, the tank 210 side. As a result, the water pressure in the tank 210 is applied to the branch pipe portion 12 side of the valve body 10, and the upstream side of the emergency water discharge valve 100 in the descending pipeline 221 is interrupted by the three-way valve 21.

As shown in FIGS. 5 and 8, the rotation of the three-way valve 21 is performed by using a rotation part 21a formed integrally with the three-way valve 21 and protruding from the valve body 10. The rotation range is determined by the rotation axis 2
Positioning plate 2 integrated with pins 1a
2. That is, the positioning plate 22 has a shape as shown in FIG.
The three-way valve 21 has a 90 ° fan-shaped locking portion 22a. When each side end surface of the locking portion 22a comes into contact with a protrusion formed on the main pipe portion 11, the three-way valve 21 rotates. Is regulated.

As shown in FIGS. 4 and 5, the water stop valve 30 interposed in the branch pipe section 12 of the main pipe section 11 is a valve which advances and retreats in a direction perpendicular to the branch pipe section 12 by rotation of the handle. 5, a valve seat 32 is formed below the valve 31 in FIG. 5 to partition the inside of the branch pipe portion 12 up and down. That is, by turning the handle, the valve 31 is moved to the position shown in FIG.
By retracting from the valve seat 32 as shown in FIG.
The water supplied inside is discharged from the faucet 33 of the water stop valve 30 through the hole of the valve seat 32.

The emergency water discharge valve 100 is constructed and implemented as follows. In this case, the water stop valve 30 provided in the branch pipe section 12 is the same as that described above, but the switching valve 20b is configured as follows.

That is, the switching valve 20b has basically the same configuration as the water shutoff valve 30, so that the main pipe portion 11 of the valve body 10 has a partition wall having a first valve seat. It is divided up and down by. A valve is provided at the lower end of a valve shaft which moves forward and backward in the direction perpendicular to the main pipe portion 11 by being rotated, and this valve normally comes into contact with a second valve seat 14 located above the valve shaft. The branch pipe section 12 is shut off, and the descending pipe 221 to which the main pipe section 11 of the valve body 10 is connected is communicated through a hole in the first valve seat 13.

In the switching valve 20b,
In an emergency, if the valve provided at the lower end thereof is brought into contact with the first valve seat 13 by rotating the valve shaft, the up and down communication of the descending pipeline 221 is cut off and the main pipe section 11 is opened.
The downstream side, that is, the side of the tank 210 and the side of the branch pipe portion 12 are communicated with each other through the hole of the second valve seat 14.

In the rectangular electric water heater 200 of the present invention having the emergency water discharge valve 100 as described above, the opening and closing door 241 is provided on the front surface of the square cover 240. It will be normally recognized that the emergency water discharge valve 100 is provided inside. In addition, if the use of the emergency water discharge valve 100 described above is described on the front surface of the opening / closing door 241, the existence of the emergency water discharging valve 100 indicated by the opening / closing door 241 becomes clearer, and the eyes are always visible. If the opening / closing door 241 is provided on the front surface of the rectangular cover 240, it is almost impossible to forget to use the water in the tank 210 using the emergency water discharge valve 100 in an emergency. .

Now, when the opening / closing door 241 is opened in an emergency, on the front of the square electric water heater 200,
The emergency water discharge valve 100 is shown in FIG.
At the same time as the exposure, the tip of the water discharge hose 50 can be automatically pulled out of the rectangular electric water heater 200. If you follow this spout hose 50 with your eyes,
Since the emergency water discharge valve 100 is located ahead of the emergency water discharge valve 100, it is immediately understood that the emergency water discharge valve 100 should be operated even in an emergency. Needless to say, even when the opening / closing door 241 is opened, it is better to describe the description on the back side of the opening / closing door 241 so that the operation method of the emergency water discharge valve 100 can be understood.

Therefore, the user operates the emergency water discharge valve 100 to discharge water or the like in the tank 210 from the water discharge hose 50. The end of the water discharge hose 50 is connected to the opening / closing door 241. In the embodiment, since it is opened downward, water to be used is reliably discharged into a bucket or the like and does not spill outside. Of course, even if there is an unexpected pressure in the discharged water or the like and the tip of the water discharge hose 50 moves due to the reaction of the discharge, the front end of the water discharge hose 50 will be
This is not the case because it is linked to Further, the water in the tank 210 may be heated and hot in some cases, but even in such a case, the tip of the water discharge hose 50 is connected to the opening / closing door 241 and it is necessary to directly touch the water discharge hose 50 with the hand. Since there is no emergency, unless the usage of the emergency water discharge valve 100 is mistaken, for example, a burn does not occur.

Now, in the emergency water discharge valve 100 employed in this embodiment, as shown in FIG.
The emergency water discharge valve 100 is connected in the water supply pipe 220 of the square electric water heater 200 and at a position slightly higher than the heater 230 in the tank 210.
When the water or the like in the tank 210 is discharged to a position slightly higher than the heater 230, the operation is stopped. This is because the discharge of water and the like from the emergency water discharge valve 100
This is performed by the pressure of the water or the like inside, and water or the like at a position lower than the emergency water discharge valve 100 is not discharged. Therefore, the heater 230 in the tank 210 is not to be exposed from the water surface, and if the heater 230 is energized without confirming that the tank 210 is completely filled with water. However, the inside of the tank 210 is not overheated by the heater 230, and the square electric water heater 200 is maintained in a safe state.

As shown in FIG. 1, the water supply conduit 220 for the rectangular electric water heater 200 has a portion higher than the tank 210 formed therein (so-called torii type piping). , When the water supply is cut off, this water supply line 2
The tank 2 is equipped with a safety valve with a negative pressure operating valve, etc.
The water in 10 is prevented from flowing back into the water pipe, and for this reason, the water supply line 220 is constituted by an ascending line 222 and a descending line 221. The emergency water discharge valve 100 is provided with these ascending or descending pipelines 222.
Although it may be provided on any side of 221, it is advantageous to provide it in the downcomer line 221.

In this emergency water discharge valve 100,
As shown in FIGS. 4 to 9, the three-way valve 21 having the first water passage 23a is housed in the main pipe portion 11 which communicates with the upper and lower sides of the descending pipe passage 221. This three-way valve 21 is in the position shown in FIGS. That is, as shown in FIG. 6, the first water passage 23 a of the three-way valve 21 communicates the upper and lower sides of the descending conduit 221 in which the emergency water discharge valve 100 is arranged, and Is the water from the downcomer 221 and the square electric water heater 2
Thus, the water and the like from the tank 210 of No. 00 are not supplied. Of course, even if the water stop valve 30 is opened in this state, no water will flow.

Here, the three-way valve 21 of the switching valve 20a is rotated to communicate the inside of the tank 210 with the branch pipe portion 12 of the valve body 10, and the lever provided in the water supply pipe 220 is operated to operate the tank. The outside air is allowed to enter into the inside 210. That is, if the three-way valve 21 is turned by a driver or the like to turn the turning part 21a which is integral with the three-way valve 21 and protrudes to the outside, as shown in FIG.
The downstream side of the emergency water discharge valve 100 of the water supply pipe 220 connected to the water supply pipe 220 communicates with the inside of the branch pipe section 12 of the valve body 10. When the water stop valve 30 provided on the branch pipe section 12 is rotated in the opening direction, the tank 21
0 by the pressure of the water stored in the branch pipe 1
The water in the tank 210 is discharged from the end of the tank 2 and can be used as emergency water.

In the three-way valve 21 of the emergency water discharge valve 100, a positioning plate 22 is integrated with a rotating portion 21a.
Of the three-way valve 21 is limited to a fixed portion by the positioning plate 22.
That is, the locking portion 22a of the positioning plate 22
Has a shape shown in FIG. 9 (a), which limits the rotation range of the three-way valve 21 to a range of 90 °. When the emergency water discharge valve 100 is used, Alternatively, the position of the three-way valve 21 when not in use can be easily confirmed from the outside.

[0040]

As described above in detail, in the present invention, as exemplified in the above embodiment, "a tank 210 having a heater 230 which is heated by electric power,
The emergency water discharge valve 100 provided outside the tank 210, and the emergency water discharge valve 100 and the tank 210
Square electric water heater 2 having a square cover 240 surrounding
00, the emergency water discharge valve 1 of the rectangular cover 240
In addition to providing an open / close door 241 at a portion facing 00,
The front end of the water discharge hose 50 on the emergency water discharge valve 100 side is connected to the back side of the open / close door 241, and when the open / close door 241 is opened, the front end of the water discharge hose 50 becomes the square cover 240.
There is a feature in its configuration that it is exposed to the outside. ”As a matter of course, the confirmation can be surely performed even in an emergency, and it is possible to take out water etc. without waste during actual use. It is possible to provide a rectangular electric water heater provided with a water discharge valve with a simple structure.

That is, the square electric water heater 2 according to the present invention
According to 00, (1) the lid constituting the square cover 240, that is, the open / close door 241 is formed on the front panel, and the emergency water discharge valve 100 may be disposed inside the open / close door 241. Therefore, the existing square electric water heater can be easily installed by a simple operation of forming the opening / closing door 241 on the front panel and providing the emergency water discharge valve 100, as well as the newly installed square electric water heater 200 of this kind. Can be a water tank for when.

(2) Needless to say, the fact that the rectangular cover 240 has the opening / closing door 241 on the front thereof does not mean that
This always indicates that the emergency water discharge valve 100 is present inside the emergency water discharge valve 100.
Use of 0 clearly indicates that emergency water can be obtained. If the emergency water discharge valve 100 is described on the opening / closing door 241 and the like, the rectangular electric water heater 200 can be used as an emergency water tank without hesitation.

(3) Therefore, the square electric water heater 200
In an emergency such as when the water supply is cut off, water or the like existing in the tank 210 of the square electric water heater 200 can be immediately used as emergency water.
It can protect the lives of those affected by natural disasters such as earthquakes and floods, albeit temporarily.

(4) Since the emergency water discharge valve 100 of the square electric water heater 200 is provided in the tank 210 on the side of the water supply pipe 220 which always supplies water at normal times, this emergency Even if water is discharged from the water discharge valve 100, impurities such as sand and rust in the tank 210 are not sucked out. This is because, in the vicinity where the water supply pipe 220 is connected to the tank 210, sand and the like are not deposited due to the flow of water during normal times.

(5) The structure of the emergency water discharge valve 100 and the opening / closing door 241 provided on the opening / closing door 241 are as described above, so that they are very simple and can be provided at low cost. You can do it.

(6) In this rectangular electric water heater 200, the emergency water discharge valve 100 is connected to the water supply line 2
20 and slightly higher than the heater 230 in the tank 210,
Even if the water in 10 is used, the heater 230 is not exposed from the water, so that the heater 230 can be protected when the square electric water heater 200 is used next time. It is. Such an excellent effect can be exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rectangular electric water heater having an emergency water discharge valve according to the present invention.

FIG. 2 is a front view of the rectangular electric water heater when a front panel is removed.

FIG. 3 shows a state in which the open / close door of the same-angle electric water heater is opened, (a) shows a case where the open / close door is open downward, and (b) shows a state where the open / close door is opened. FIG. 4 is a partially enlarged perspective view showing a case of a type that is opened in a lateral direction.

FIG. 4 is an enlarged plan view of an emergency water discharge valve provided in the rectangular electric water heater.

5 is a cross-sectional view of the emergency water discharge valve shown in FIG.

6 is a vertical sectional view of the emergency water discharge valve in a normal state, taken along line 2-2 in FIG. 5;

FIG. 7 is a longitudinal sectional view corresponding to FIG. 6, showing a state of an emergency water discharge valve in an emergency.

8 shows a three-way valve employed in the emergency water discharge valve shown in FIG. 5, (a) is an enlarged plan view thereof,
(B) is a partially broken front view thereof.

9A and 9B show a positioning plate provided in the three-way valve, wherein FIG. 9A is a plan view thereof, and FIG. 9B is a partially cutaway front view thereof.

[Explanation of symbols]

 100 Emergency water discharge valve 10 Valve body 11 Main pipe 12 Branch pipe 13 First valve seat 14 Second valve seat 20a / 20b Switching valve 21 Three-way valve 22 Positioning plate 23a First water passage 23b First water passage 30 Water stop Valve 31 Valve 32 Valve seat 40 Hose nipple 41 Nipple body 42 Auxiliary cylinder 43 Ventilation space 44 Air hole 200 Square electric water heater 210 Tank 220 Water supply pipe 221 Downcomer pipe 222 Downcomer pipe 230 Heater 240 Square cover 241 Open / close door

Claims (1)

[Claims] 1. A prismatic shape comprising a tank containing a heater heated by electric power, an emergency water discharge valve provided outside the tank, and a square cover surrounding the emergency water discharge valve and the tank. An electric water heater, wherein an opening / closing door is provided at a portion of the rectangular cover facing the emergency water discharge valve, and the tip of the water discharge hose on the emergency water discharge valve side is connected to the back side of the open / close door, A rectangular electric water heater characterized in that, when the opening / closing door is opened, the tip of the water discharge hose is exposed to the outside of the rectangular cover.