JPH0528127B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric water heater that houses a liquid such as water, heats it, and keeps it warm.

BACKGROUND OF THE INVENTION In recent years, there has been a rapid increase in demand for electric water heaters configured to boil and keep warm a contained liquid, such as water.

As an example of a conventional electric water heater of this type, the one shown in FIGS. 2 and 3 is known. To explain based on the drawings, 1 is a cylindrical container with a bottom that stores a liquid 2 such as water inside, and a heater 3 is installed on the bottom of the container 1 to boil the liquid 2 inside and then keep it at a constant temperature. is installed. This container 1 is provided inside the water heater body 4 with a certain space between it and the inner surface of the water heater body 4. The lower end of the container 1 is connected to the lower end of a discharge pipe 5, and the liquid 2 inside the container 1 is led out from the discharge port 6 communicated with the upper end of the discharge pipe 5 and taken out to the outside via the discharge port 7. It's starting to become easier. A first check valve 8 having a substantially inverted conical shape is provided between the outlet pipe 5 and the outlet 6, and is configured to close the outlet 6 when the vessel is overturned.

Reference numeral 9 denotes a lid body pivotally supported on the upper end of the water heater main body 4 for opening and closing the upper end opening of the container 1, which includes a bellows 10 inside, a central pushing body 11 that presses the bellows 10, a steam passage 13 having an inlet 12 communicating with the container 1 at one end and facing the outside from the upper end of the lid 9 at the other end;
an opening/closing mechanism (described later) that opens and closes the steam passage 13 in conjunction with the compression operation of the bellows 10 by 1;
, a lid cover 14 forming the bottom of the lid body 9 for supporting the open lower end portion of the bellows 10 , and a top provided inside the pushing body 11 for supporting the open upper end portion of the bellows 10 . and a plate 15, each of which is attached in an airtight manner. More specifically, a hole 16 is formed in the center of the upper plate 15, and a seal valve 18 with a seal packing 17 attached thereto is installed in the hole 16 so as to be able to move up and down. It is in contact with the inner surface of the upper end of 11. Further, a spherical second check valve 19 is built in the middle of the steam passage 13, and a seal hole 20 is formed which is opened and closed by the second check valve 19.
A check valve 19 is configured to close the seal hole 20. The opening/closing mechanism is composed of a valve body 22 fitted with a lid gasket 21 and a lifting shaft 23. When pressurized air is sent into the container 1 by the pressure of the bellows 10, a pressure feeding port 24 formed in the lid cover 14 is used. The lid gasket 21 is opened, and at the same time, the valve body 22 closes the inlet 12 of the steam passage 13. Note that when the bellows 10 is not compressed, the valve body 22 is
5, the inlet 12 of the steam passage 13 is opened, and at the same time, the pressure feed port 24 is closed by the lid packing 21 attached to the valve body 22. Furthermore, in relation to the weights of the first and second check valves 8 and 19, the first check valve 8 is made heavier than the second check valve 19. 26 is a gasket for sealing between the container 1 and the lid 9.

In the above configuration, the operation will be explained.

First, when taking out the liquid 2 from the container 1, by pressing the pusher 11, the steam passage 1 is removed.
At the same time when the inlet 12 of the bellows 10 is closed by the valve body 22, the air inside the bellows 10 is compressed and flows into the container 1 from the pressure-feeding port 24 through an air port (not shown).
The liquid 2 inside the container 1 is pushed and taken out from the discharge port 7 via the discharge pipe 5 and the discharge port 6.

Further, when the liquid 2 is not taken out from the container 1, steam generated due to boiling, for example, does not pass through the inside of the bellows 10 because the pressure feeding port 24 is closed by the lid packing 21, and the steam generated by boiling does not pass through the inside of the bellows 10. The steam is guided to the outside through the steam passage 13.

By the way, when the container falls over, the outlet port 6 and the steam passage 13 are closed by the first and second check valves 8 and 19, and the inside of the container 1 is sealed, and the liquid inside the container 1 is closed. 2 is prevented from leaking outside.

Problems to be Solved by the Invention In such a conventional electric water heater, if the container is accidentally overturned while the internal liquid is being boiled, the container 1 is damaged by the first and second check valves 8 and 19, the container 1 becomes airtight and the internal pressure of the container 1 increases due to the generated steam. It is common to release it to the outside. By the way, when the vessel is raised up with a certain internal pressure remaining in the container 1 that has fallen over,
Normally, it is often hurriedly erected, and at that time a shock is applied to the vessel, and this shock causes the first and second
Since the check valves 8 and 19 open almost simultaneously, there is no problem because the internal pressure escapes from the opened steam passage 13. However, if you stand it up gently without applying any shock to the vessel, the internal pressure will cause the first and second check valves to open. Stop valve 8 and 1
The first check valve 8 is made to be heavier than the second check valve 19 during the process of boiling and the internal pressure gradually decreasing. As a result, the first check valve 8 is always opened in advance, and at this time, since there is still some internal pressure, the hot water inside the container 1 is naturally discharged from the outlet 6 due to this internal pressure, which can cause burns. There was a problem of liability.

The present invention solves these problems,
To provide an electric water heater with excellent safety, which safely releases the internal pressure even if internal pressure remains in the container after standing up the overturned container, and prevents hot water from being discharged. This is the purpose.

Means for Solving the Problem In order to solve this problem, the present invention provides a container equipped with a heater and containing a liquid inside the water heater main body, and a container attached to the upper end of the water heater main body. A lid body for opening and closing the upper end is provided, and a first check valve is provided, which communicates with the container a discharge pipe for taking out the liquid inside, and closes a discharge port provided at the tip of the discharge pipe when the container falls over; Further, the lid body is provided with a steam passage whose one end communicates with the inside of the container and whose other end faces the outside of the lid body, and a second non-return check that closes a seal hole formed in the middle of the steam passage when the vessel falls over. A valve _is provided, _{and M 1 /} The configuration is such that S ₁ <M ₂ /S ₂ .

Effect With this configuration, when the overturned vessel is raised upright, the opening of the second check valve is larger than that of the first check valve due to the relationship of M ₁ /S ₁ <M ₂ /S ₂ described above. Because the weight per unit area of the (seal hole) is large, the second check valve opens before the first check valve, and even if internal pressure remains in the container, the internal pressure is transferred from the steam passage to the outside. Since the hot water is allowed to escape, there is no spontaneous discharge of hot water from the outlet, and there is no risk of burns, making it safe.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIG. Note that the same members as in the conventional example are indicated by the same reference numerals, and only the parts that differ from the conventional example in structure will be described in detail.

In the figure, the weight of the inverted conical first check valve 8 provided between the outlet pipe 5 and the outlet 6 for taking out the liquid 2 from the container 1 is M ₁ , and the opening area of the outlet 6 is S ₁ , the weight of the spherical second check valve 19 provided in the middle of the steam passage 13 is M ₂ , and this second check valve 19 is
When the opening area of the seal hole 20 that is closed by is S ₂ , the respective relationships are configured such that M ₁ /S ₁ <M ₂ /S ₂ .

The other configurations are the same as the conventional example.

In the above configuration, the operation is explained as follows.
First, when taking out the liquid 2 from the container 1, by pressing the pusher 11, the steam passage 13 is removed.
At the same time as the inflow port 12 of the bellows 10 is closed by the valve body 22, the air inside the bellows 10 is compressed and sent from the pressure feed port 24 to the inside of the container 1 through an air port (not shown). The liquid 2 inside is pushed and taken out from the discharge port 7 via the discharge pipe 5 and the discharge port 6.

Further, when the liquid 2 is not taken out from the container 1, steam generated due to boiling, for example, does not pass through the inside of the bellows 10 because the pressure feeding port 24 is closed by the lid packing 21, and the steam generated by boiling does not pass through the inside of the bellows 10. The steam is guided to the outside through the steam passage 13.

By the way, when the container falls over, the outlet port 6 and the steam passage 13 are closed by the first and second check valves 8 and 19, and the inside of the container 1 is sealed, and the liquid inside the container 1 is closed. 2 is prevented from flowing out to the outside, and when the container 1 falls over during boiling, the internal pressure of the container 1 increases due to the steam generated by boiling even after the container 1 is sealed by the two check valves 8 and 19. Internal pressure above a certain level is released to the outside through a gap slightly formed in the gasket 26 that ensures airtightness between the container 1 and the lid 9. Then, when a certain internal pressure remains in the container 1 and the container is gently raised in that state, the weight of the first check valve 8, the opening area of the outlet port 6, the second check valve The structure is such that the relationship between the weight of the valve 19 and the opening area of the seal hole 20 is M ₁ /S ₁ <M ₂ /S ₂ , and the second check valve 19 is stronger than the first check valve 8.
Since the weight per unit area of the opening [seal hole 20] is larger, the first
The second check valve 19 always opens the steam passage 13 before the check valve 8, and the internal pressure is released to the outside through the steam passage 13. As a result, there is no natural discharge of hot water from the outlet 6 to the outside, and the risk of burns can be eliminated.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, the weight of the first check valve on the outlet side is M ₁ ,
Assuming that the opening area of the outlet is S ₁ , the weight of the second check valve on the steam passage side is M ₂ , and the opening area of the seal hole provided in the steam passage is S ₂ , the relationship between these is M ₁ /S ₁ <M ₂ /S ₂ , the second check valve opens first during the process of lowering the internal pressure after the overturned vessel is erected, allowing the internal pressure to escape to the outside via the steam passage. Therefore, it is possible to eliminate spontaneous discharge of hot water from the outlet, and there is no risk of getting burned, making it possible to provide an electric water heater with excellent safety.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view of essential parts showing the overall configuration of an electric water heater according to an embodiment of the present invention, FIG. 2 is a cutaway side view of essential parts showing the overall configuration of a conventional electric water heater, and FIG. The figure is an enlarged sectional view of the lid body. 1... Container, 2... Liquid, 3... Heater, 4...
...Water boiler body, 5... Outlet pipe, 6... Outlet, 8
...First check valve, 9...Lid, 10...Bellows, 12...Inflow port, 13...Steam passage, 19...
...Second check valve, 21...Lid gasket, 22...
Valve body, 24...pressure feeding port.

Claims (1)

[Scope of Claims] 1. A container equipped with a heater and containing a liquid is provided inside a water heater main body, a lid body for opening and closing the upper end of the container is provided at the upper end of the water heater main body, and the container is provided with a lid body for opening and closing the upper end of the container. A first check valve is provided that communicates with an outlet pipe for taking out the liquid inside and closes an outlet provided at the tip of the outlet pipe when the container falls over, and one end of the lid body communicates with the inside of the container. A steam passage whose other end faces the outside of the lid body is provided, and a second check valve is provided which closes a seal hole formed in the middle of the steam passage when the vessel falls over, and the weight of the first check valve is M ₁ ,
The opening area of the outlet is S ₁ and the weight of the second check valve is
An electric water heater configured to satisfy M ₁ /S ₁ <M ₂ /S 2 with M ₂ and _the opening area of the seal hole being S ₂ .