JPH0430976Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric water heater for storing hot water heated by a heater.

This type of electric water heater is constructed so that the upper end opening of the main body case containing a built-in inner container for hot water storage is covered with a lid, and the hot water in the inner container can be drawn out from the spout using an air pump. It is common that the inner container is communicated with the atmosphere through a steam exhaust passage and the steam generated inside is discharged to the outside, thereby preventing abnormally high pressure inside the inner container. It is being

However, when using the above configuration, if the steam exhaust passage becomes clogged or the heater becomes abnormally heated, the pressure inside the inner container may increase. If this is the case, the lid will be completely restrained, so there will be no outlet for the steam, and the pressure inside the inner container will increase, which could eventually lead to a dangerous situation.

This invention was made in view of the above points,
The purpose of this is to prevent the pressure inside the inner container from becoming dangerous even if the steam exhaust passage becomes clogged or the heater becomes abnormally heated.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

This electric water heater is composed of a main body case 1 having a shoulder member 4 attached to the upper end of an exterior case 3, and a lid body 2 that covers the upper part of the main body case 1.

Inside the main body case 1, an inner container 6 made of a corrosion-resistant metal such as stainless steel is disposed such that a water supply port 7 passing through the shoulder member 4 is formed in the upper part of the inner container 6. That is, the inner container 6 has its upper opening edge 6a connected to the opening edge 4a of the shoulder member 4, and its bottom surface 6b connected to the bottom of the outer case 3 via the supports 8, so that the inner container 6 can be attached to the main body. It is arranged and fixed inside the case 1.

A heater 9 for heating is attached to the outer peripheral wall of the inner container 6.

On the other hand, the lid body 2 includes a lid body 36 which is pivotally supported via a hinge pin 5 to the shoulder member 4 on the upper part of the main body case 1 so as to be freely openable and closable, and a lid part 12 which tightly seals the water supply port 7. The lid main body 3
A pressurized bellows pump 10 is disposed inside the inner container 6 for discharging the hot water in the inner container 6 to the outside. The bellows pump 10 is composed of a substrate 10a which also serves as the bottom plate of the lid main body 36, and a movable plate 10c attached to the upper surface of the substrate 10a via a bellows 10b which can be freely expanded and contracted. Pressing plate 1 that comes into contact with the upper surface of movable plate 10c
1 to be pressed and driven. Note that the pressing plate 11 is provided on the upper surface of the lid main body 36.
An opening 31 is formed through which the image can be seen.

Further, the lid portion 12 includes a bellows pump 10.
A lumen 13 is formed which serves both as an air passage from the inner container 6 and a steam passage from the inner container 6.

The discharge port 15 of the bellows pump 10 and the lid inner cavity 13 are airtightly communicated through a through hole 17 having a packing 16 when the lid body 2 (specifically, the lid body 36) is closed. It is becoming more and more like this. Reference numeral 14 is an inlet of the bellows pump 10.

A liquid pumping pipe 18 facing the inner bottom of the inner container 6 and a liquid pouring pipe 19 facing the outside of the main body case 1 are attached to the lid 12, and both communicate with each other via a passage 20 inside the lid. A liquid pouring passage 21 that connects the inside of the inner container 6 and the outside of the main case 1
It consists of Reference numeral 30 indicates a spout at the tip of the liquid spout tube 19. Note that the liquid pumping pipe 18 and the liquid pouring pipe 19 may be attached to the shoulder member 4 in some cases.

Furthermore, a steam passage 23 is formed in the lid 12 for guiding the steam S in the inner container 6 through the lid lumen 13 to the space 32 above the shoulder member 4. With this configuration, the steam S in the inner container 6 can flow through the lid inner cavity 13 and the steam passage 2.
3 and the upper space 32 of the shoulder member 4. The bellows pump lower plate 10a passes through the bellows pump 10 and avoids the inside of the bellows pump 10.
A steam exhaust passage 22 that passes downward and is discharged to the outside.
It is supposed to be constructed.

The opening 23a on the inlet side of the steam passage 23 is opposed to the through hole 17, and between the two, a valve body 24 for selectively closing both is connected to the through hole 17 by a spring 25. It is placed in a state where it is biased in the direction of closing. That is, under normal conditions, the steam passage 23 is in an open state and the through hole 17 is in a closed state.

The valve body 24 is pressed against the pressing plate 11 by a pressing member 26 disposed inside the bellows pump 10.
When pressed down, the opening 23a of the steam passage 23 is closed after opening the through hole 17.

That is, in this embodiment, the steam exhaust passage 2
2 (specifically, the inlet side opening 23 of the steam passage 23
A) is to be opened and closed by a valve body 24 that operates in accordance with the expansion and contraction of the air pump 10. Reference numeral 27 indicates a return spring for the bellows pump 10, and 28 indicates a pressing member 2.
6 is the return spring.

The outlet side opening 23b of the steam passage 23 is faced at a position opposite to the spout 30, and a temperature sensor for detecting the steam temperature is provided at a portion of the shoulder member 4 facing the outlet side opening 23b. 29 are arranged. The temperature sensor 29 is
It is connected to the heater 9 through a lead wire 33 and an outlet 34 disposed in a gap 35 formed between the inner container 6 and the outer case 3, and controls the heater current according to the detected steam temperature. When the water in the inner container 6 boils, the temperature of the steam is detected and the heater 9 is switched from heating to keeping warm.

The electric water heater constructed as described above operates as follows.

When the hot water in the inner container 6 is not poured out,
The steam S generated in the inner container 6 is discharged to the outside via the steam exhaust passage 22 consisting of the lid inner cavity 13, the steam passage 23, and the upper space 32 of the shoulder member 4. Even when water is boiled in the container 6, the pressure inside the inner container 6 does not become abnormally high.

Note that if the steam exhaust passage 22 is clogged or the heater 9 is abnormally heated, the pressure inside the inner container 6 will become abnormally high. is attached to the inner container 6 via the hinge pin 5 so that it can be opened and closed freely.
As the internal pressure increases, the lid body 2 (specifically, the lid body 32 and the lid part 12) is slightly displaced upward, and the steam S in the inner container 6 flows into the gap between the lid part 12 and the water supply port 7. And it will flow out through the gap between the lid part 12 and the lid main body 32. Therefore, abnormally high pressure inside the inner container 6 is prevented. by the way,
The lid body 2 is normally locked by a locking means to prevent it from opening unnecessarily, but when it is locked by a locking means, it is not completely restrained like a screw-on type, but has some play. Therefore, upward displacement of the lid portion 12 and the lid body 32 described above is permitted.

When trying to pour out the hot water in the inner container 6,
When the press plate 11 is pressed downward, the spring 27
is compressed, and this compression causes the pressing member 26 to move downward against the urging force of the spring 28, and as the pressing member 26 moves downward, the valve body 24 is pushed down against the urging force of the spring 25. After opening the through hole 17, the inlet side opening 2 of the steam passage 23 is opened.
3a is occluded. Furthermore, as the pressing plate 11 descends, the movable plate 10c is pressed, thereby compressing the bellows 10b and the air inside it.
In other words, the bellows pump 10 is driven. Then, compressed air from the bellows pump 10 is forced into the inner container 6 through the discharge port 15, the through hole 17, and the lid inner cavity 13, and pressurizes the liquid level of the hot water. Due to the pressurization, a part of the hot water in the inner container 6 is transferred to the liquid pumping pipe 18, the lid passage 20, and the liquid pouring pipe 1.
The liquid is led out from the spout 30 through the liquid spout passage 21 consisting of 9. After that, when the pressing force on the pressing plate 11 is released, the pressing force of the spring 27 causes the pressing plate 11 to rise together with the movable plate 10c.
Along with this upward movement, the pressing member 26 moves upward due to the biasing force of the spring 28, and along with this upward movement, the valve body 24 rises due to the biasing force of the spring 25. As a result, the passage hole 17 is closed, and the inlet opening 23a of the steam passage 23 is opened, restoring the original state. By repeating these operations, the hot water in the inner container 6 is drawn out in appropriate amounts.

As described above, when hot water is not being drawn out (that is, when no pressing force is applied to the pressing plate 11), the inside of the inner container 6 is communicated with the outside via the steam exhaust passage 22. However, when the bellows pump 10 performs a compression operation, the steam passage 23 that constitutes the steam exhaust passage 22 is closed by the valve body 24.
Since the inlet opening 23a of the bellows pump 10 is closed and communication between the inside of the inner container 6 and the outside is cut off, the compressed air in the bellows pump 10 can be reliably pumped into the inner container 6 without leaking to the outside. It is.
Note that under normal conditions, the steam S in the inner container 6
Since the steam is discharged to the outside through the separately formed steam exhaust passage 22 without passing through the inside of the bellows pump 10, the durability of the bellows pump 10 is impaired by the heat of the steam. That's not the case.

Moreover, the outlet side opening 23b of the steam passage 23 is
Since it is configured to face the opposite position of the spout 30, the steam outlet and the spout 30 are separated by a large distance, and even if the steam S leaks from the vicinity of the spout 30, the steam temperature will decrease. Therefore, there is no risk of injury to the user.

Next, the effects of the electric water heater of the present invention will be described.

According to the present invention, the lid body 2 is attached to the upper end of the main body case 1, which houses the inner container 6 for storing hot water heated by the heater 9, so as to be able to open and close freely with one end as a fulcrum. A pressurized bellows pump 10 for discharging hot water in the inner container 6 is provided in the lid 2, and the steam S generated in the inner container 6 passes through the lid 12 and the bellows pump 10 Since the steam exhaust passage 22 is provided to exhaust the steam to the outside through the lower part of the bellows pump lower plate 10a while avoiding the inside, the steam exhaust passage 22 is not clogged in the middle or the heater 9 becomes abnormally heated. Even in this case, the upward displacement of the lid body 2 allows the steam S in the inner container 6 to be discharged to the outside, which has the practical effect of preventing abnormally high pressure in the inner container 6. There is.

In addition, the steam exhaust passage 22 is provided so that the steam S in the inner container 6 avoids the inside of the bellows pump 10, so thermal deterioration of the bellows pump 10 is prevented, which greatly improves durability. It also has the effect of contributing.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of an electric water heater according to an embodiment of the present invention. 1... Main body case, 2... Lid, 6... Inner container, 9... Heater, 10... Bellows pump, 2
2...Steam exhaust passage.

Claims (1)

[Scope of utility model registration request] A lid body 2 is attached to the upper end of the main body case 1 which houses an inner container 6 for storing hot water heated by a heater 9.
A pressurized bellows pump 10 is installed in the lid body 2 so as to be able to open and close freely using one end as a fulcrum, and a pressurized bellows pump 10 is provided in the lid body 2 to draw out the hot water in the inner container 6. The steam generated by the lid 1 closes the opening 6a of the inner container 6.
2. An electric water heater characterized by being provided with a steam exhaust passage 22 which passes through the inside of the bellows pump 10 and is discharged to the outside through a lower part of the bellows pump lower plate 10a, avoiding the inside of the bellows pump 10.