JP2863985B2 - Electric water heater with emergency water discharge valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an emergency water discharge valve.
It relates example was an electric water heater, emergency water discharge Bal utilized to use the water or warm water is present in the tank of an electric water heater in an emergency, especially as a very water
It relates to the electric water heater that was attached the drive.

[0002]

2. Description of the Related Art As shown in FIG. 1, an electric water heater generally has a water supply pipe connected to a water supply source such as tap water connected to the bottom of a tank, and the water supply pipe is inserted into the tank from the water supply pipe. The supplied water is heated by a heater in the tank, and supplied from a hot water supply pipe connected to an upper part of the tank. Therefore, the water of the used hot water is always supplied from the water supply pipe side in the tank of the electric water heater, and the water or the hot water is always stored.

[0003] 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. Things. 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. In particular, drinking water is indispensable for one day,
When the water supply stops, running a water truck will require a large public project, and you must prepare for it on a daily 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.

[0004] Based on the above situation, the inventors of the present invention 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, the electric water heater 200 is provided with a discharge valve 240 used for cleaning the inside of the tank 210 as shown in FIG. 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), if water is to be used by using the drainage valve, the drainage channel or the like is broken and the discharge valve 240 is exposed. This discharge valve 240 cannot be easily used because it must be done and there is usually no room for 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 and the like coming out of the discharge valve 240 can be used for emergency use. It can hardly be used as drinking water .

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 overheat and be 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.

Therefore, the present inventor has repeatedly studied how to make it possible to take out water or the like existing in the tank of the electric water heater in an emergency in a state where it can be applied as emergency water. As a result, the present invention has been completed.

[0008]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above circumstances, and the problem to be solved is to supply water or hot water in a tank of an electric water heater in an emergency in case of emergency water. And make it available.

An object of the first aspect of the present invention is to provide an emergency water discharge valve.
It makes exist within the tank can be surely taken out and the water or hot water as a very water, and can in that each part at the time of preventing reuse exposure from water heater or the like is prevented from breakage An electric water heater having a simple configuration.

Further, it is an object of the invention according to claim 2, it is possible to achieve their invention similar object of the first aspect, or One on emergency water discharge valve through a hose nipple be connected to a hose, to provide by a simple configuration name has electric water heater that the water in the tank will completely drained.

[0011]

Means for Solving the Problems In order to solve the above problems, means according to the first aspect of the present invention will be described with reference numerals used in the embodiments.
To a built-in heater 230 which is heated by the power within the 10
Water to supply water into the tank 210
The pipe 220 is a torii type and a part of it is from the tank 210
In electric water heater 200 to be increased, this
In the water supply line 220 of the electric water heater 200,
In a position slightly higher than the heater 230 in the
Water or hot water present in the
Connect emergency water discharge valve 100 for taking out
And the operation of the waste water 100 valve, the valve body 10 and a branch pipe portion 12 that now branches main tube portion 11 connected to the feed water lines 220, from the outside is disposed in the main passage 11 A switching valve 20 for communicating the inside of the tank 210 and the branch pipe section 12 with each other, a water stop valve 30 disposed in the branch pipe section 12 and discharging water or hot water supplied into the branch pipe section 12 to the outside. Has been configured as having
An electric water heater 200 " characterized by the following.

Further, means of adopting the invention according to claim 2, for the electric water heater 200 engages Ru to claim 1, the branch pipes of the valve body 10 constituting the non <br/> conventional water discharge valve 100 The part 12 includes a nipple main body 41 connected to the distal end side of the branch pipe part 12, and an auxiliary cylinder 42 attached to the distal end of the nipple main body 41 with a ventilation space 43 formed therein. The ventilation space 4 is formed from the air hole 44 provided.
Hose nipple 4 for introducing outside air through 3
0 is connected.

[0013]

The operation of the invention according to each of the above-structured inventions will be described below together with the flow of water by dividing the terms.

[0014] - to claim 1 with the engaging Ru electric water heater 200 First, the emergency water discharge valve 100 attached to the electric water heater 200 of this, as shown in FIGS. 1 and 2, the electric water heater 2
Since the water supply pipe 220 is connected to a position slightly higher than the heater 230 in the tank 210, the tank 2 is connected through the emergency water discharge valve 100.
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. Because this emergency water discharge valve 100
Is discharged by the pressure of water or the like in the tank 210.
This is because water at a lower position is not discharged. Therefore, the heater 230 in the tank 210 is not to be exposed from the water surface,
Even if the heater 230 is energized without confirming that the water is completely filled in the heater 23,
With 0, the inside of the tank 210 is not overheated, and the electric water heater 200 is maintained in a safe state.

In particular, the water supply line 220 for the electric water heater 200 has, as shown in FIG.
10 (a so-called torii type pipe), and when the water supply is cut off, the water supply pipe 2
The tank 2 is provided by a safety valve with a negative pressure actuated valve provided in
The water in the pipe 10 is prevented from flowing back into the water pipe. For this purpose, the water supply pipe 220 is constituted by an ascending pipe 222 and a descending pipe 221 as shown in FIG. The emergency water discharge valve 100 according to the present invention may be provided on any one of the upward or downward conduits 222 and 221, but is preferably provided in the downward conduit 221.

In the event of an emergency, such as an earthquake, when tap water is no longer supplied, including the water supply pipe 220, the emergency water discharge valve 100 is used for the tank 21.
Although for use as emergency water for water or the like that exist in the 0, the emergency water discharge valve 100, it indicates two things in examples given below, explaining respectively, It is as follows.

(Emergency Water Discharge Valve 100 According to First Embodiment) In this emergency water discharge valve 100, as shown in FIGS. The three-way valve 21 having the first water passage 23a is housed therein. In normal times, the three-way valve 21 is located at the position shown in FIGS. That is, the three-way valve 2
As shown in FIG. 5, the first water passage 23a communicates vertically with a descending conduit 221 in which the emergency water discharge valve 100 is disposed. 221 from the tank 21 of the electric water heater 200
Water from 0 is not supplied. Of course, even if the water stop valve 30 is opened in this state, no water will flow.

Here, when it is necessary to use water or the like in the tank 210, the three-way valve 21 of the switching valve 20a is used.
Is rotated to make the inside of the tank 210 communicate with the branch pipe section 12 of the valve body 10, and a lever provided on the water supply pipe 220 is operated so that outside air can enter the tank 210. That is, when 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, as shown in FIG.
The downstream side of the emergency water discharge valve 100 of the water supply pipe 220 connected to the pipe 10 communicates with the inside of the branch pipe section 12 of the valve body 10. Here, if the water stop valve 30 provided in the branch pipe section 12 is rotated in the opening direction, the pressure of the water stored in the tank 210 causes the tip of the branch pipe section 12 to move the water stop valve 30 in the tank 210. The water will be discharged 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
The shape shown in FIG. 8A limits the rotation range of the three-way valve 21 to a range of 90 °. The position of the three-way valve 21 at the time of use can be easily confirmed from the outside.

(Emergency Water Discharge Valve 100 According to Second Embodiment) In this emergency water discharge valve 100, as shown in FIGS. 10 and 11, the configuration of the switching valve 20 b is changed to a water stop valve in the branch pipe portion 12. This is substantially the same as 30. For this purpose, the inside of the main pipe portion 11 of the valve body 10 is divided through a first valve seat 13 as shown in FIGS. That is, in the switching valve 20 b, by rotating the valve shaft 24 from the outside, the valve 25 provided at the lower end in the figure is connected to the main pipe 1 of the valve body 10.
The contact between the upstream side and the downstream side of the water supply pipe 220 is interrupted by contacting the first valve seat 13 formed in the inside of the water supply pipe 220.
When the valve 25 is separated from the second valve seat 14 located above the valve 25, the water shutoff valve 30 is provided on the downstream side of the first valve seat 13, that is, in the tank 210, as shown in FIG. The branch pipes 12 are communicated with each other.

Thus, if the water stop valve 30 is rotated in the opening direction, the water and the like in the tank 210 can be used as emergency water. Of course, this water stop valve 3
0, when the emergency water discharge valve 100 is not used, that is, when the switching valve 20b is in the state shown in FIG. Never.

[0022] - in the electric water heater 200 of this about to claim 2 engagement Ru electric water heater 200, the emergency water discharge valve 1
00, the branch pipe portion 12 of the valve body 10 of that, is obtained by connecting a host Sunippuru 40 as shown in FIG. 9,
By having this hose nipple 40, it is connected to a hose for very water extraction through <br/> to this, never become discharged total amount by water and the siphon effect in the tank 210. Conversely, if a hose is connected to the branch pipe section 12 without passing through the hose nipple 40 and water or the like in the tank 210 is taken out, in some cases, the water level in the hose may be reduced by the heater 230 in the tank 210. In this case, a large amount of water in the tank 210 is discharged due to the siphon phenomenon, and the heater 230 in the tank 210 is exposed from the water surface.

This is prevented by the hose nipple 40. The reason for this is that the ventilation space 4 formed between the nipple main body 41 and the auxiliary cylinder 42 can be prevented.
This is because the hose nipple 40 has an air hole 44 provided in the auxiliary cylinder 42 and communicating with the ventilation space 43. That is, the ventilation space 43 and the air holes 4
4, the air is always supplied into the hose (not shown) connected to the hose nipple 40, and the water surface in the hose rises at the tip of the branch pipe portion 12, that is, the tank 210.
It does not become lower than the upper end of the heater 230 inside.

[0024] Thus, engagement Ru electric water heater in claim 2 2
In 00, be connected to the hose during use of the emergency water discharge valve 100, the water surface at the discharge downstream side of the emergency water discharge valve 100 does not become lower than the heater 230, water and the like in the tank 210 There is absolutely no need to discharge more than necessary.

[0025]

EXAMPLES Next, the engaging Ru electric water heater 200 in each claim,
It described with the embodiment shown in the drawings. Since the in the embodiment of following there are two examples as an emergency water discharge valve 100 before connecting the hose nipple 40, described separately terms respectively.

[0026] - claims engagement Ru electrodeposition temperature water 200 to the present invention for the electric water heater 200 according to 1 is such as shown in FIG. 1, the vertical tank 210 having a water volume of about 370 to 550 liters It is one obtained by the mold, Ru der those heater 230 heated by power are built in the tank 210. Also, this electric water heater 200
Water supply pipe for supplying water into the tank 210
The road 220 is a torii gate and part of it is
This torii-shaped water supply line 220
Water from the water pipe etc. is always supplied to the tank 210
It is to be paid. In other words, this tank 210
Inside, tap water is always supplied by a water supply pipe 220 composed of a rising pipe 222 connected to a water pipe and a descending pipe 221 connected to the bottom of the tank 210. .

[0027] Certainly theory, tank 21 of the electric water heater 200
0 is connected to a hot water supply pipe (not shown) at the upper end, and the electric water heater 200 uses the pressure from the water supply pipe 220 to store hot water stored in the upper part of the tank 210 at a predetermined location. It is intended to provide hot water. A discharge valve 240 is provided at the bottom of the tank 210. By opening the discharge valve 240,
The sand, rust and the like in the tank 210 can be discharged, and the discharge valve 240 is connected to the water supply line 2 described above.
20 etc. are connected.

By the way, in the electric temperature condenser 200, riser passage 2 the water supply conduit 220 and the descending conduit 221
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 line 220 for the electric water heater 200 has, as shown in FIG.
10 (a so-called torii type pipe), and when the water supply is cut off, the water supply pipe 2
The tank 2 is provided by a safety valve with a negative pressure actuated valve provided in
The water in the pipe 10 is prevented from flowing back into the water pipe. For this purpose, the water supply pipe 220 is constituted by an ascending pipe 222 and a descending pipe 221 as shown in FIG.

(Embodiment 1) FIGS. 3 to 8 show a first embodiment of the emergency water discharge valve 100.
6 includes a main body 11 in which a switching valve 20a is to be provided, and a water stop valve 30 as shown in FIG. And a branch pipe section 12 to be provided. The main pipe section 11 is interposed in the descending pipe line 221 in a state as shown in FIG. 5, for example, and accommodates a later-described three-way valve 21 to support it in a retaining manner.
A projection 22 that restricts the rotation range of the positioning plate 22 by contacting the locking portion 22a of the positioning plate 22 shown in FIG. Is formed.

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. In the center of the three-way valve 21, as shown in FIG. 7, a first water passage 23 a for communicating the upper and lower portions of the descending pipe 221 at normal times (when the emergency water discharge valve 100 is not used),
A second water passage 23b branching 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. 7A, 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. 4 and 7, 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. 3 and 4, the water stop valve 30 interposed in the branch pipe portion 12 of the main pipe section 11 is a valve which advances and retreats in a direction perpendicular to the branch pipe portion 12 by rotation of the handle. A valve seat 32 for vertically dividing the inside of the branch pipe portion 12 is formed below the valve 31 in FIG. 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.

[0034] (Example 2) emergency water discharge valve 100 of the second embodiment of this is,
For water shut-off valve 30 provided in the branch pipe part 12 is the same as in Example 1 described above, the switching valve 20b is Ru is constructed as follows. Ie, the switching valve 20b is basically one that has the same structure as the water shut-off valve 30, in order that, within the main tube portion 11 of the valve body 10, shown in FIGS. 11 to 13 As described above, the partition is vertically divided by the partition having the first valve seat 13. A valve 25 is provided at the lower end of a valve shaft 24 that is advanced and retracted in a direction perpendicular to the main pipe portion 11 by being rotated. As shown in FIGS. Sometimes, it abuts on the second valve seat 14 located above it to shut off the side of the branch pipe portion 12 and, at the same time, closes the main pipe portion 1 of the valve body 10.
1 is connected to the descending pipeline 221 connected to the first valve seat 13 through a hole in the first valve seat 13.

In the switching valve 20b,
In an emergency, by rotating the valve shaft 24, the valve 25 provided at the lower end thereof is brought into contact with the first valve seat 13,
The upper and lower communication of the downcomer pipe 221 is interrupted, and the downstream side of the main pipe section 11, that is, the tank 210 side and the branch pipe section 12 side are communicated through the hole of the second valve seat 14. It is.

[0036] - wherein the electric water heater 200 of this with the engagement Ru electric water heater 200 to a second aspect, the emergency water discharge valve 1 described above
00 to the faucet 33 on the water stop valve 30 side.
The snipple 40 is provided. E Sunippuru 4
0 is the faucet 33 of the water stop valve 30 as shown in FIG.
Nipple body 41 screwed to the nipple body 4
1 and an auxiliary cylinder 42 attached to the auxiliary cylinder 42 in a state where a ventilation space 43 is formed.
3 has an air hole 44 for communicating the outside with the outside. That is, the hose nipple 40 connects a hose for guiding discharged water, but always keeps the pressure in the hose at atmospheric pressure.

Thus, the hose nipple 40
When the water surface in the tank 210 descends and comes to the substantially same place as the emergency water discharge valve 100, the pressure in the hose is set to the atmospheric pressure to prevent the siphon phenomenon due to the water in the hose. In other words, when the hose is directly connected to the faucet 33 without using the hose nipple 40 and the water or the like in the tank 210 is discharged, the hose extends to a position lower than the heater 230 in the tank 210. If so, a siphon phenomenon occurs in which water or the like in the tank 210 is sucked by the water pressure in the hose. Then, tank 2
The water and the like inside the hose nipple 4 are discharged so that the heater 230 is exposed.
If 0 is adopted, the pressure below the air hole 44 is always set to the atmospheric pressure, that is, the same pressure as the water level in the tank 210, so that the problem of the exposure of the heater 230 as described above does not occur.

[0038]

As described above in detail, in the present invention is first described in claim 1, as exemplified in the above embodiments, the <br/> the heater 230 is heated by the power in the "tank 210 built To supply water into the tank 210
The water supply pipe 220 is a torii type and a part thereof is a tank 210.
In the electric water heater 200 set to be higher than
In the water supply line 220 of the electric water heater 200,
At a position slightly higher than the heater 230 in the
The water or hot water present in the tank 210 is
Connect the emergency water discharge valve 100 for taking out directly to the outside.
Continued, and the drainage 100 valve, the valve body 10 and a branch pipe portion 12 that now branches main tube portion 11 connected to the feed water lines 220, from the outside is disposed in the main passage 11 A switching valve 20 for communicating between the inside of the tank 210 and the branch pipe section 12 by operation, and a water stop valve 30 disposed in the branch pipe section 12 for discharging water or hot water supplied into the branch pipe section 12 to the outside. configuration as those with the door lower child
Is characterized on that configuration when "Thus, the emergency ejection
With that a water valve, present in the tank can be surely taken out and the water or hot water as a very water, and is each unit to prevent exposure of the water heater or the like at the time of re-use power that can be things you do not want to damage
The water heater 200 can be provided with a simple configuration.

[0039] That is, according to the engagement Ru invention in claim 1, (1) electric water heater 200 of the present invention, the water supply conduit 22
Whether the emergency water discharge valve 100 is interposed at a predetermined position in 0
Use the tank 210 as an emergency water tank.
You can do it. (2) Of course, this electric water heater 200
Oite emergency as put away, it exists in the tank 210
Existing water etc. can be used immediately as emergency water
Because of the natural disasters such as earthquakes and floods.
Can protect people ’s lives, albeit temporarily,
You can. (3) This electric water heater 200 is
Water supply pipe 220 side that always supplies water in normal time
Emergency water discharge valve 100 is installed in
Even if water is discharged from the emergency water discharge valve 100,
Impurities such as sand and rust in the
No. Near the water supply line 220 connected to the tank 210
Nearby, sand etc. is not accumulated due to normal water flow.
Because it is. (4) The electric water heater 200 is connected to the water supply line 220 thereof.
Since the emergency water discharge valve 100 is provided,
It is very easy to provide, and it is cheap
You can do it. (5) The electric water heater 200 is provided with a water supply line 220
Medium and slightly more than heater 230 in tank 210
In order to interpose the emergency water discharge valve 100 at a high position
The water in the tank 210,
To expose water 230 from water.
To protect the heater 230 for the next use.
You can do it. Such an excellent effect can be exhibited.

Further, in the invention according to claim 2, the faucet 33 of the emergency water discharge valve 100 is provided with the branch pipe portion 1.
2 has a nipple main body 41 connected to the distal end side thereof, and an auxiliary cylinder 42 attached to the distal end of the nipple main body 41 with a ventilation space 43 formed therein. The invention is characterized in that the hose nipple 40 for introducing outside air through 43 is connected to the hose nipple 40 provided at the distal end of the branch pipe portion 12, and thereby, the invention according to claim 1 is provided. It is possible to completely discharge the water in the tank even if a hose is connected to the emergency water discharge valve according to claim 1 through a hose nipple. it can be provided by such have electric water heater 200 a simple configuration.

That is, the electric water heater according to claim 2
According to 200 100, not only the effects (1) to (5) of the electric water heater 200 according to claim 1 can be exerted, but also the water in the tank 210 is connected to the emergency water discharge valve 100 by connecting a hose. Tank 2 when using
10 can be reliably prevented from being exposed from the water surface, and the heater 230 and thus the electric water heater 200 can be prevented.
As a result, the overall protection can be ensured.

[Brief description of the drawings]

1 is a schematic perspective view of the engagement Ru electrodeposition temperature water dispenser to the present invention.

FIG. 2 is a partial front view showing a main part of FIG. 1 in an enlarged manner.

FIG. 3 is an enlarged plan view of the emergency water discharge valve.

4 is a cross-sectional view of the emergency water discharge valve shown in FIG. 3 taken along line 1-1.

FIG. 5 is a vertical sectional view of the emergency water discharge valve in a normal state, taken along line 2-2 in FIG. 4;

FIG. 6 is a longitudinal sectional view corresponding to FIG. 5, showing a state of the emergency water discharge valve in an emergency.

7 shows a three-way valve used in the emergency water discharge valve shown in FIG. 4, (a) is an enlarged plan view thereof,
(B) is a partially broken front view thereof.

FIGS. 8A and 8B show a positioning plate provided on the three-way valve, wherein FIG. 8A is a plan view thereof, and FIG.

9 is a partial cutaway front view showing a hose nipple that constitute the emergency water discharge valve engagement Ru electric water heater to claim 2.

10 is a longitudinal sectional view of the valve body 10 employed in the emergency water discharge valve according to the actual施例2.

FIG. 11 is a cross-sectional view of the emergency water discharge valve.

FIG. 12 is a vertical sectional view of the emergency water discharge valve in a normal state, taken along line 3-3 shown in FIG. 11;

FIG. 13 is a longitudinal sectional view showing the emergency water discharge valve in an emergency, that is, in use.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 emergency water discharge valve 10 valve body 11 main pipe part 12 branch pipe part 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 Valve 31 Valve 32 Valve seat 40 Hose nipple 41 Nipple main body 42 Auxiliary cylinder 43 Ventilation space 44 Air hole 200 Electric water heater 210 Tank 220 Water supply line 221 Down line 222 Down line 230 Heater

Claims (2)

(57) [Claims] 1. A heater which is heated by electric power is built in a tank, and a water supply pipe for supplying water into the tank is a torii type so that a part thereof is higher than the tank. In an electric water heater, water or hot water existing in the tank is taken out of the water supply line of the electric water heater at a position slightly higher than a heater in the tank in an emergency. connect the emergency water discharge valve for an emergency water discharge valve of this, the valve body having a branch pipe portion which now branches main unit connected before Symbol water supply conduit, the main path A switching valve disposed in the tank and communicating between the inside of the tank and the branch pipe section by an external operation; and a stop valve disposed in the branch pipe section to discharge water or hot water supplied to the branch pipe section to the outside. With water valve Electric water heater, characterized by being configured as. 2. A nipple main body connected to the distal end side of the branch pipe portion, and an auxiliary cylinder attached to the distal end of the nipple main body in a state where a ventilation space is formed, wherein an air hole provided in the auxiliary cylinder is provided. The electric water heater according to claim 1, wherein a hose nipple for introducing outside air through the ventilation space is provided at a tip of the branch pipe portion.