JPH0423522B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a lid for an electric water heater that heats and keeps a contained liquid warm.

BACKGROUND ART In recent years, there has been a rapid increase in demand for boiling type electric water heaters that keep water warm after boiling it.

Conventionally, the lid of this type of electric water heater has been shown, for example, in Japanese Patent Publication No. 49490/1983.

In other words, as shown in Figure 3, when the internal pressure of the water heater container increases when it accidentally falls over during boiling,
The sealing surface of the skirt portion 52 of the switching valve 51 is pushed into the inside of the bellows 53, and the container and the bellows 53 are
were brought into communication through the air outlet 54, and the internal pressure of the container was gradually released to the outside through the bellows 53.

Problems to be Solved by the Invention In such a conventional configuration, the skirt portion 52 of the switching valve 51 is deformed and stretched inside the bellows 53 due to abnormal internal pressure such as when falling down, and the radial dimension becomes smaller. The overlap with the air outlet 54 is eliminated, the outer periphery of the skirt 52 is pushed toward the bellows side, the air outlet 54 is unblocked, and the internal pressure is released into the bellows 53. However, in reality, the outer periphery of the skirt 52 The internal pressure when the part is pushed into the bellows 53 side needs to be enough to stretch the skirt part 52 toward the bellows 53, and the skirt part 52, which is generally made of silicone rubber, is There was a problem in that it was extremely difficult to stretch and push into the bellows 53 with a small allowable internal pressure (described later), and the internal pressure inevitably tended to increase.

The above-mentioned allowable internal pressure is approximately 0.1Kg/cm ² or less,
If the temperature exceeded this level, when the lid was opened while the internal pressure remained (when the water was near the full water mark on the electric water heater), hot water would splash out and could cause burns.

As described above, the present invention has a low allowable internal pressure of about 0.1 kg/cm ² or less (by the way, the internal pressure during hot water tapping operation is
The present invention provides a lid for an electric water heater that makes it possible to release internal pressure (approximately 0.3 to 0.5 kg/cm ² ) and ensures greater safety.

Means for Solving the Problems The technical means of the present invention for solving the above problems are as follows:
A main body that has a built-in container and a first check valve that closes the opening of the drainage pipe in the middle of the drainage pipe that leads the solution inside the container to the outside in the event of an abnormality such as when the container falls over, and a container. A steam passageway having a bellows for pumping air from a pressure-feeding port inside, one end having an inflow port leading into the container, and the other end having a steam port facing the outside from a certain position of the lid, and a steam passage for compressing the bellows. It has a switching valve that opens and closes this steam passage in conjunction with the switching valve, and has an elastic body inclined upwardly and inwardly at the top of the switching valve, so that under normal conditions when the bellows is not compressed, pressure is supplied by the switching valve. It has a lid that closes the mouth and has a built-in second check valve in the middle of the steam passage that closes the steam passage in the event of an overturning of the vessel. The steam passage has a structure in which the elastic body is deformed and communicates the inside of the container with the bellows.

Function With this configuration, by tilting the elastic body provided at the top of the switching valve upward and inward, it can be deformed at low internal pressure (approximately 0.1 kg/cm ² or less) and the internal pressure can be released from the low stage. This ensures even greater safety even in the event of a fall during boiling.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 and 2, 1 is a cylindrical container with a bottom, and a heater 2 is attached to the bottom of the container 1 to boil the internal solution and then keep it at a constant temperature. The container 1 is housed within the main body 3 in a certain space.

Further, the solution in the container 1 is poured out from the outlet 5 through the outlet pipe 4, and a first check valve 6 having a substantially inverted conical shape is provided in the middle of the outlet pipe 4. 3 In the event of a fall, etc., the outlet 7 is the first check valve 6
It is now closed by

Reference numeral 8 denotes a lid body pivotally supported on the upper opening of the container 1 so as to be freely openable and closable. A steam passage 12 whose other end faces the outside of the lid 8; an opening/closing mechanism (described later) that opens and closes the steam passage 12 in conjunction with the compression operation of the bellows 9 by the pusher 10; The lower end open part is a lid cover 1 that covers the lower surface of the lid body 8.
3, and the open upper end portion is covered with an upper plate 14, which are each welded in an airtight state. Further, a hole 15 is formed in the center of the upper plate 14, and a seal valve 17 with a seal packing 16 attached thereto is installed in the hole 15 so as to be able to move up and down.
The upper surface of 7 is in contact with pusher 10 . A spherical second check valve 18 is built in the middle of the steam passage 12, and a seal hole 19 is formed which is opened and closed by the second check valve 18. Further, the opening/closing mechanism includes a valve body equipped with a first lid packing 22 having a first elastic lip 20 inclined upward and inward and a second elastic lip 21 inclined outward and downward. 23 and a lifting shaft 24, this valve body 23 normally abuts against a stopper rib 25 to ensure the basic dimension A (FIG. 1).

In addition, when the pressurized air is sent into the internal device through the pressurized port 26 by the pressure of the bellows 9, the lower end portion 28 of the valve body 23 and the first lid are urged by the first spring 27 in conjunction with the press operation. The second lip 21 of the gasket 22 allows a second lid gasket 29 to be attached to close the inlet 11 of the steam passage 12 and to forcefully feed air. Further, under normal conditions when the bellows 9 is not compressed, the pressure feeding port 26 is closed by the first lip 20 of the valve body 23 which is urged upward by the second spring 30.

The operation of the above configuration will now be described.
When injecting liquid, the steam passage 12 is closed by the valve body 23 by pressing the pushing body 10, and at the same time, the air in the bellows 9 is compressed, and the air is compressed from the pressure feed port 26 to the container through the air port (not shown) of the steam passage 12. 1
The solution in the container 1 is injected from the discharge port 5 through the outlet pipe 4.

Furthermore, when the liquid is not injected, the steam generated during boiling, for example, does not pass through the inside of the bellows 9 because the pressure feeding port 26 is closed by the lip 20 of the first lid packing 22, and flows from the inlet port 11 to the inner wall of the steam passage 12 and the It passes through the gap between the two check valves 18 and is guided to the outside from the seal hole 19.

On the other hand, in the event of an abnormality such as the container tipping over, the first and second check valves 6 and 18 close the outlet pipe 4 and the steam passage 12 to create a sealed state, preventing the solution inside the container 1 from leaking to the outside. However, if the container falls over during boiling, the internal pressure will rise due to the steam generated by boiling even after the container is sealed. Due to this increased internal pressure, the lip 20 inclined upwardly and inwardly of the first lid packing 22 is deformed downward due to the low internal pressure, and the inside of the container 1 and the bellows 9 are brought into communication, and the internal pressure is reduced to the bellows 9.
It escapes to the outside through the inside. In particular, since the lip 20 is inclined upward and inward, the bending force of the thin cross-sectional shape of the lip 20 is sufficient instead of stretching the elastic body (made of rubber) as in the skirt portion 52 of the conventional example. Internal pressure can be released from low levels of around 0.1Kg/cm ² or less. Therefore, it is more reliable and has excellent safety.

Effects of the Invention As is clear from the above embodiments, according to the present invention, when an abnormal internal pressure occurs, such as when a boiling vessel overturns, a bellows is provided at an air pressure feeding port.
By tilting the upper lip shape of the first lid gasket, which normally closes this pressure feeding port, upward and inward, the lip can be deformed only by the bending force of the thin cross section of the lip, so that the internal pressure can be reduced to 0.1 kg/ The internal pressure can be released through the bellows from a low level of less than cm ² , and there is no risk of burns caused by splashing hot water, making it possible to create a more reliable and safer electric water heater, which has great practical effects. There is.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts of an electric water heater showing one embodiment of the present invention, FIG. 2 is a full cross-sectional view showing the overall structure of the electric water heater, and FIG. 3 is a conventional electric water heater. FIG. 2 is a perspective view of the main parts of the water heater. 1... Container, 3... Main body, 4... Outlet pipe, 6...
...First check valve, 8...Lid body, 9...Bellows,
DESCRIPTION OF SYMBOLS 11...Inflow port, 12...Steam passage, 18...Second check valve, 20...First lip, 23...Switching valve, 26...Pressure port.

Claims (1)

[Claims] 1. A main body containing a container and having a first check valve built in in the middle of a discharge pipe that leads the solution inside the container to the outside, which closes the opening of the discharge pipe in the event of an abnormality such as when the container falls over; A bellows for pumping air from a pressure port is built into the container, and one end has an inflow port leading into the container, and the other end has a steam passage facing the outside from a certain position of the lid body, and the bellows is connected to the compression operation of the bellows. , has a switching valve that opens and closes this steam passage, and has an elastic body inclined upwardly and inwardly on the upper part of this switching valve,
In the normal state when the bellows is not compressed, the pressure feeding port is closed by the elastic body, and a lid body is provided in the middle of the steam passage, which has a built-in second check valve that closes the steam passage when the vessel topples. When the body falls over, the elastic body deforms due to the increase in internal pressure of the sealed container.
A lid for an electric water heater having a steam passage structure that communicates the inside of the container with a bellows.