JPH0728822B2 - Electric water heater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric water heater that heats and keeps a contained liquid.

2. Description of the Related Art In recent years, the demand for electric water heaters that boil the stored water and keep it warm has become the majority.

Conventionally, as this kind of electric water heater, for example, those shown in FIGS. 3 to 5 are known. Explaining with reference to the drawings, a container 2 for containing a liquid is installed inside a water heater body 1, and a heater 3 for heating the contained liquid and keeping it warm is attached to the bottom surface of the container 2. , Again container 2
Outlet pipe 4 for leading out the liquid contained in the
Is provided, and the liquid passes through the outlet pipe 4 and the discharge port 5 at the tip.
It is being poured out from the. This outlet pipe 4
A first check valve 6 having a substantially inverted conical shape is provided in the pipe line, and the outlet 7 is closed by the first check valve 6 when the water heater body 1 falls.

A lid 8 is pivotably supported by a hinge shaft provided on one side of the upper portion of the water heater body 1 so as to be openable and closable. Inside the lid 8,
A bellows 9, a pusher body 10 for pressing the bellows 9, a steam passage 12 having an inflow port 11 opened at one end above the container 2 and the other end opened to an outer surface of the lid body 8, A switching valve 13 that closes the vapor passage 12 is provided in association with the compression operation of the bellows 9 by the pushing body 10.
The open portion at the lower end of is covered with a lid cover 15 having a pressure feed port 14 in the center, and the open portion at the upper portion is covered with an upper plate 16, which are welded in an airtight state. An intake port 17 is formed in the center of the upper plate 16, and a seal valve 19 having a seal packing 18 is attached to the intake port 17 so as to be able to move up and down.
The upper surface of the seal valve 19 is in contact with the push body 10. A second check valve 20 having a spherical shape is arranged in the pipeline of the steam passage 12, and a seal hole opened and closed by the second check valve 20.
21 is formed, and the seal hole 21 is closed by the second check valve 20 when the water heater body 1 falls.

The switching valve 13 includes a safety piece 22 having an inwardly inclined upper portion and an elastic protruding piece having an outer downwardly inclined portion.
The valve body 25 is provided with a first lid packing 24 having 23, and a lifting shaft 26. When the compressed air sent by the pressing of the bellows 9 is sent to the inside of the container 2 through the pressure opening 14, the lower tip portion 28 of the valve body 25 and the first tip 27 which are urged by the first spring 27 in conjunction with the pressing operation. Due to the protruding piece 23 of the lid packing 24, the steam passage 12 equipped with the second lid packing 29
The inflow port 11 is closed, and air is pressure-fed to the container 2. When the bellows 9 is not compressed, the second spring
The pressure feed port 14 is closed by the safety piece 22 of the valve body 25 biased upward by 30.

The operation of the above configuration will be described. First, in the case of injecting liquid, the steam passage 12 is closed by the switching valve 13 by the pressing operation of the pressing body 10, and at the same time, the air inside the bellows 9 is compressed and the air port of the steam passage 12 is compressed from the pressure supply port 14 It is pressure-fed to the inside of the container 2 through a not shown), and the liquid contained in the container 2 is injected from the discharge port 5 through the outlet pipe 4. Further, when the liquid is not injected, for example, steam generated during boiling does not pass through the inside of the bellows 9 from the inflow port 11 because the pressure feed port 14 is closed by the safety piece 22 of the first lid packing 24.
It is guided to the outside from the seal hole 21 through the gap between the inner wall of 12 and the second check valve 20. On the other hand, when there is an abnormality such as a fall of the body, the first and second check valves 6 and 20 are used to guide the outlet pipe 4 and the steam passage.
12 is closed to be in a hermetically closed state to prevent the contained liquid in the container 2 from flowing out. However, in a fall or the like during boiling, the internal pressure rises due to the steam generated by boiling even after the closed state. The safety piece 22 is deformed by this internal pressure, and the internal pressure is transmitted from the pressure feed port 14 to the bellows 9.
It is designed to be opened to the outside through the inside.

Further, in the case of the first liquid injection, to be described in detail, since the second spring 30 is set to be stronger than the first spring 27, the first spring is first pressed by the pressing operation of the pressing body 10. 27 the deflection seal valve 27 closes the intake port 17, then the second
In general, the deflection switch valve 13 of the spring 30 opens the pressure feed port 14 and further closes the inflow port 11 to pressure feed the air in the bellows 9 and inject it.

Problems to be Solved by the Invention In such a conventional electric water heater, the closing of the intake port 17 is performed earlier than the opening of the pressure feeding port 14 as a timing, and therefore, as shown in FIG. The safety piece 22 is spread outward by the compressed air in the bellows 9, and the lid cover 15 and the safety piece 22 are spread.
Since there is no gap between the tip of the pressing member 10 and the air in the bellows 9 does not flow out into the container 2, the pressing force is temporarily increased at the initial pressing operation of the pressing body 10 and a smooth pressing operation is possible. There was a problem that I could not.

INDUSTRIAL APPLICABILITY As described above, the present invention, even if it has a safety piece for releasing the internal pressure at the time of fall to the outside, at the time of the pressing operation, the pressing force does not temporarily increase and a smooth pressing operation is possible. It is an object of the present invention to provide an electric water heater having excellent operability.

Means for Solving the Problems In order to solve this problem, the present invention comprises a water heater main body containing a container and a lid body which is pivotally supported on the upper portion of the main body to open and close. Has a steam passage whose one end is opened above the container and the other end is opened on the surface of the lid, and has an intake port in the upper part and a pressure feed port in the lower part, and the container is interlocked with the pressing operation of the pressing body. The bellows for sending air into the inside of the bellows, and a switching valve for opening the pressure feeding port and closing the inlet of the steam passage by the pressing operation of the pressing body are provided at the intake port of the bellows. The pressure feeding port is closed when the body is not operated, and a safety piece is formed which is deformed by the abnormal internal pressure in the container when the body falls and is opened to the outside through the bellows. A gap provided in a part of the closed portion of the pressure feed port by a piece Is.

Action With the above configuration, when the pressing port is pressed, when the intake port at the upper part of the bellows is closed and then further pressed, the safety piece is urged by the compressed air in the bellows toward the seal portion side of the compressed port. However, since a gap is provided in a part of the seal part of the pressure feed port part by the safety piece, the pressure feed air is sent into the container through this gap, so the biasing force of the safety piece to the seal part side of the pressure feed port is (EN) An electric water heater having excellent operability, in which the pressure is reduced and the compressed air is smoothly sent to the container, and the pressing operation force of the pressing body does not suddenly increase, and a smooth pressing operation is possible.

Example An example of the present invention will be described below with reference to FIGS. 1 and 2. The same members as those in the conventional example are designated by the same reference numerals, and only the parts different in configuration from the conventional example will be described in detail.

As shown in the figure, in conjunction with the pressing operation of the pressing body 10, the opening of the pressure feeding port 14 at the bottom of the bellows 9 and the inflow port 11 of the steam passage 12 are linked.
The switching valve 13 that closes the valve is a safety piece that connects the sealing piece 31 that closes the inlet 11 and the abnormal internal pressure in the container 2 when the body falls and communicates the container 2 with the inside of the bellows 9.
And a lifting shaft 33 having a seal collar 32 that abuts in the vicinity of the tip of the safety piece 22, and one of the contact surfaces of the safety piece 22 and the seal collar 32. A radial groove is cut on the side of the seal flange 32 to form a gap 34.

The other structure is the same as that of the conventional example. However, some parts have different shapes, but the basic mechanism is the same.

The operation of the above configuration will be described.

First, when injecting liquid, the suction port 17 is pressed by pressing the pusher 10.
Is closed and the pumping of air in the bellows 9 is started,
At this time, since the pressure feed port 14 is still closed by the safety piece 22, the safety piece 22 is pushed down to the seal brim 32 side by the pressure feed air, and a force acts in a direction in which a gap is less likely to be created between the two. However, since the radial gap 24 is provided in a part of the contact portion between the safety piece 22 and the seal brim 32,
As shown in the figure, the pressure-fed air flows out from the gap 34 to the container 2 side, and the force by which the safety piece 22 is pushed down to the seal collar 32 side by the pressure-fed air is reduced. A sufficient gap is created between the seal flange 32 of 22 and the pressure feed port.
14 is opened smoothly and at the same time the steam passage 12 inlet
11 is closed, the compressed air is sent into the container 2, and the liquid in the container 2 can be smoothly poured to the outside.

When the liquid is not injected, for example, the steam generated during boiling flows out through the steam passage 12 to the outside. At this time,
Steam tries to flow into the bellows 9 through the gap 34 provided between the safety piece 22 and the seal brim 32. However, since the gap 34 is small, steam becomes dew condensation water when touching this portion, and this condensation The gap 34 is closed by the water itself, and the steam blows the bellows 9.
It never flows in.

The operation when the body falls is the same as in the conventional example.

EFFECTS OF THE INVENTION As is clear from the above description of the embodiments, according to the present invention, since a gap is provided in a part of the sealing portion between the safety piece and the sealing brim that closes the intake port when the liquid is not injected, fall safety Even if it has a safety piece for ensuring the property, it is possible to perform a smooth pressing operation of the pressing body, and it is possible to provide an electric water heater that is safe and has excellent operability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a lid of an electric water heater showing an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view around a switching valve at the initial stage of the liquid injection operation of the same embodiment. FIG. 3 is a sectional view showing the entire structure of a conventional electric water heater, FIG. 4 is a sectional view of a lid of the electric water heater, and FIG. FIG. 3 is an enlarged cross-sectional view around the switching valve of FIG. 1 ... Main body of water heater, 8 ... Lid, 9 ... Bellows, 10 ...
… Pressed body, 11 …… Inlet, 12 …… Steam passage, 13 …… Switching valve, 14 …… Pressure feed port, 17 …… Intake port, 22 …… Safety piece, 34…
… Gap.

Claims (1)

[Claims] 1. A water heater main body containing a container, and a lid body rotatably supported on the upper portion of the body. One end of the lid body opens above the container and the other end. Is provided with a steam passage opening on the surface of the lid, a bellows having an intake port in the upper part and a pressure-feeding port in the lower part, and pressure-feeding air into the container in association with the pressing operation of the pressing body. Is provided with a switching valve that opens the pressure feed opening by pressing the pusher and closes the inlet of the steam passage, and the switching valve closes the pressure feed opening when the pusher is not operated, and A safety piece that is deformed by an abnormal internal pressure in the container when the body falls and opens to the outside through the bellows is formed on a part of the closed portion of the pressure feed port by the safety piece when the pressing body is not pressed. An electric water heater with a gap.