JPH078382A - Safety device for electric water heater. - Google Patents

Abstract

PURPOSE:To completely prevent the outflow of the fluid in the container whenever the water heater totters or topples. CONSTITUTION:A vapor path 19 with a throttled diameter is installed inside the vapor channel 12 connecting the interior and the exterior of a container 1. A projection piece capable of shooting up higher than the top surface of the vapor path is installed at the central part of a check valve 20 pressurized to block the vapor path 19 from beneath its bottom surface, and a globoid 23 capable of releasing the vapor pressure to the check valve 20 through the projection piece 21 is installed on the top surface of the vapor path 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted in a lid of an electric water heater that heats and keeps a liquid contained in a built-in container by electric heat to prevent the stored liquid from flowing out when the electric water heater falls or tilts. At the same time, the present invention relates to a safety device for an electric water heater that prevents the vapor pressure in the container from rising when preventing the outflow of the liquid.

[0002]

2. Description of the Related Art In recent years, there has been a rapid increase in the demand for a boiling type electric water heater that heats the water once it has been boiled, and the safety device for the electric water heater has been improved accordingly. Therefore, as a conventionally known safety device for this kind of electric water heater, as disclosed in, for example, the invention of Japanese Patent Publication No. 4-23522 regarding the lid of the electric water heater,
When the electric water heater shown in FIG. 3 is accidentally tumbled during boiling, a substantially inverted cone provided between the outlet pipe 54 and the discharge port 55 for discharging the liquid in the container 51 to the outside. -Shaped check valve 56 and a check valve 68 formed of a ball bearing provided in a steam passage 62 that communicates the inside and the outside of the container 51.
And are closed, the container 51 is sealed, and the container 51
The inside liquid is prevented from flowing out.

However, when the body falls over while boiling, the internal pressure of the container rises due to the steam generated by boiling even after the closed state. Due to this increase in internal pressure, the container 5
The bellows 5 is provided in the lid 57 as an air supply means for sending air into the container 1 under pressure to draw the liquid in the container 51 to the outside.
The lip 70, which is attached to the valve body 9 and is inclined upward inward of the valve body 52, is deformed downward due to a low internal pressure so that the container 51 and the inside of the bellows 59 communicate with each other, and the internal pressure is released to the outside through the inside of the bellows 59. It was.

In such a safety device, when the main body falls, the check valve 56 provided in the lead-out pipe 54 has a substantially inverted conical shape, and closes the lead-out pipe 54 at a slight fall angle of the main body. The ball bearing, which is another check valve 68 provided in the steam passage 62, moves inside the wall of the steam passage 62 and the check valve 68 seals unless the main body falls over until the seal hole 71 is closed. The hole 71 was not blocked to prevent the liquid from flowing out.

Further, since the generated steam in the container 51 after closing the two check valves 56 and 68 is released to the outside through the inside of the bellows 59, hot water also enters the bellows 59 together with the steam, so Even after the fall of the container body was noticed and the container body was properly placed, the hot water remained in the bellows 59, causing problems such as abnormal noise when the bellows 59 expanded and contracted, and deterioration of the bellows 59.

On the other hand, as a conventional example of a safety device other than the above, Japanese Patent Publication No. 62-27 relating to an air pot safety device.
The invention of No. 810 and the invention of Japanese Utility Model Publication No. 63-5640 are known, but in this case, an operating knob or an operating member for opening and closing a steam valve for opening and closing a steam passage communicating between the inside and the outside of the container is provided. Therefore, the main purpose is to prevent the unexpected pouring of hot water due to a malfunction, and it was not made to prevent the outflow of hot water or steam to the outside when the electric water heater falls.

Also, Japanese Patent Publication No. Sho 63-52 concerning the water heater.
In the invention of, the safety device for preventing the discharge of hot water from the exhaust path by providing a water shutoff valve that closes the exhaust path that communicates the inside and outside of the container when the main body is in an inverted state,
In addition, the actual opening of the fall stop valve in the water heater Sho 62
In the invention of No. 168830, a valve chamber accommodating a valve element is provided in the middle of a passage communicating with the outside air in the container, and when the water heater falls, the valve element moves inside the valve chamber and closes the upper communication port. A shielding surface is provided on the top surface of the valve body to prevent the liquid in the container from flowing out when the valve falls.

However, in either of the above cases, it is not possible to completely prevent the outflow of the liquid during the fall due to the spilling of hot water to the outside while the water stop valve or the valve body moves during the fall of the main body. It was On the other hand, in the invention of Japanese Utility Model Publication No. 3-31236 concerning the boiling type electric pot, the structure in which the communication between the air pump and the container body is closed is prevented to prevent the steam generated by boiling from entering the air pump. However, the purpose is to keep the inside of the air pump in a dry and hygienic state, but this invention is a boiling thermostat that detects boiling of liquid,
There is a problem in that the structure is complicated because an actuator that operates in conjunction with the operation of the air pump is provided.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and reliably prevents the liquid in the container from flowing out when the main body falls or is tilted. In addition, it is also an object of the present invention to provide a safety device for an electric water heater that prevents the rise of the internal pressure in the container when preventing the outflow of liquid and prevents steam and hot water from entering the air supply means such as a bellows. It was done.

[0010]

In order to achieve the above object, a safety device for an electric water heater according to the present invention discharges the liquid in the container to the outside by pumping air into the container built in the main body. A steam passage with a narrowed inner diameter is provided in the vertical portion of the steam passage that communicates the inside and outside of the electric water heater with air supply means, and the steam passage is urged by a spring so that the steam passage can be closed from the lower surface, and the steam Provide a check valve having a protrusion in the center that can project beyond the upper surface of the passage, and place a spherical body capable of deactivating the spring of the check valve on the upper surface of the steam passage through the protrusion. It is composed of

When the body of the electric water heater equipped with the safety device having the above-mentioned structure is tilted even a little, the spherical body comes out of the state of being mounted on the protruding piece on the upper surface of the steam passage, and the check valve is pushed by the spring. It is raised to block the steam passage from the lower surface and demonstrate reliable safety. Further, by connecting the upper surface side and the lower surface side of the steam passage provided in the vertical portion of the steam passage with a steam pressure relief hole having a diameter smaller than that of the steam passage, it is possible to prevent all check valves when the body falls or tilts. Is a preferable structure as a safety device for preventing the rise of the internal pressure of the container by discharging the vapor of the internal pressure increase or the hot water corresponding to the increase when the internal pressure of the container is increased to the outside through the vapor pressure escape hole.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a safety device for an electric water heater according to the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view according to one embodiment of the safety device of the conventional example shown in FIG. This is an electric water heater having substantially the same configuration and function as the water heater, and FIG. 2 is an enlarged view of a main part of the safety device of FIG.

That is, in FIG. 1, reference numeral 1 is a bottomed cylindrical container built in the water heater body, and the liquid contained in the container 1 is heated and boiled from the outer periphery to the bottom of the container 1. After that, a heater 2 for keeping the temperature at a constant temperature is mounted, and the container 1 is built in the main body 3 via a constant space. Further, the liquid in the container 1 is discharged from the discharge port 5 to the outside through the outlet pipe 4, and a check valve 6 having a substantially conical shape is provided in the middle of the outlet pipe 4, and At the time of falling, the check valve 6 closes the gap between the outlet pipe 4 and the outlet 7 to prevent the pouring of hot water.

Next, a lid 8 for opening and closing the opening is pivotally supported at the upper opening of the main body 3 having the container 1 built therein. It has a bellows 9 which is an air supply means for pumping air and pouring out the liquid in the container 1 to the outside, and a pushing body 10 which presses the bellows 9. Further, the lid 8 has a container 1 at one end.
And a steam passage 12 having the other end facing the outside of the lid body 8, and an opening / closing means for opening / closing the steam passage 12 in conjunction with the compression operation of the bellows 9 by the pushing body 10. Mechanism 18 is provided.

The lower end open portion of the bellows 9 is covered with a lid cover 13 which covers the lower surface of the lid body 8, and the upper end open portion thereof is covered with an upper plate 14, which are welded in an airtight state. On the other hand, a hole 15 is formed in the central portion of the upper plate 14, and a seal valve 17 having a seal packing is mounted in the hole 15 so that the seal valve 17 can be moved up and down. ing.

Next, referring to FIG. 2, the inside of the container 1 and the lid 8
A so-called constricted steam passage 19 having a narrowed inner diameter is provided in a part of the vertical portion in the steam passage 12 penetrating through the lid 8 so as to communicate with the outside of the upper surface of the. A check valve 20 is provided on the lower surface of the steam passage 19 in the form of a disk that can close the steam passage 19 from the lower surface, and has a protrusion 21 at the center thereof that can project beyond the upper surface of the steam passage 19. In addition, the check valve 20 is biased by a spring 22 in a push-up direction for closing the steam passage 19.

Further, a spherical body 23 such as a ball bearing is placed on the upper surface of the steam passage 19, and the weight of the spherical body 23 projects during normal boiling and heat retention of the body 3 of the electric water heater. The spring 22 of the check valve 20 is deenergized via the piece 21. In this embodiment, a ball bearing is used as the spherical body 23 placed on the upper surface of the steam passage 19, but the spherical body 23 is not limited to the ball bearing and depresses the spring 22. Any spherical body made of a metal or another material having a sufficient weight to be used may be used.

Further, a steam pressure relief hole 25 that connects the upper surface side and the lower surface side of the steam passage 19 provided in the vertical portion of the steam passage 12 is not closed by the check valve 20.
The steam pressure relief hole 25 is provided at a position near 9 and has a smaller diameter than the steam passage 19. Next, the operation of the electric water heater equipped with the safety device having the above configuration will be described.

First, when the electric water heater is filled with liquid, the vapor passage 12 is opened and closed by the pressing operation of the pusher 10.
At the same time as being closed by 8, the air in the bellows 9 is compressed, the air is pressure-fed from the pressure feed port 24 through the inflow port 11 into the container 1, and the liquid in the container 1 passes through the outlet pipe 4 and out through the discharge port 5 to the outside. Inject liquid. In addition, when the liquid is not injected, for example, the generated steam during boiling is not passed through the bellows 9 because the pressure feed port 24 is closed by the opening / closing mechanism 18, so that the steam pressure escapes from the inflow port 11 through the steam passage 12. It is led out from the hole 25.

On the other hand, when the electric water heater main body falls over abnormally, the check valve 6 of the outlet 7 and the check valve 2 of the steam passage 12 are provided.
By 0, the lead-out pipe 4 and the vapor passage 12 are closed and sealed, so that the liquid in the container 1 can be prevented from flowing out. On the other hand, when the main body 3 tilts about 45 ° and falls halfway, the spherical body 23 on the upper surface of the steam passage 19 is disengaged from the projection piece 21 on the upper portion of the check valve 20, so that the check valve 20 is opened. Since the steam passage 19 is closed by being urged in the upward direction by the spring 22, the steam passage 19 in the conventional example shown in FIG. 3 at the time of a fall is compared with the case where the steam passage 62 is closed by using the ball bearing as the valve body of the check valve 68. Outflow of hot water from the steam passage 12 can be prevented more completely.

In either case of the main body 3 falling down or halfway, the check valves 6 and 20 are closed and the internal pressure of the container 1 rises. , Vapor pressure relief hole 25 without passing bellows 9
Is discharged to the outside from the inside, and an increase in the internal pressure of the container 1 can be prevented.

[0022]

According to the electric water heater equipped with the safety device of the present invention described above, when the main body falls during boiling or when it falls halfway, not only the liquid outlet pipe but also the vapor passages are reversed. It is completely closed by a stop valve, preventing the discharge of hot water and eliminating the risk of burns due to pouring hot water, thus improving safety.

In particular, in the present invention, since the spherical body for deactivating the check valve in the steam passage is placed on the steam passage, the check valve operates even if the main body is slightly inclined, and the steam passage is prevented. It is possible to completely prevent the discharge of hot water from. Further, the rise of the internal pressure of the container due to the complete operation of the check valve when the main body falls or falls halfway is solved by the steam pressure relief hole, and steam or hot water does not enter the air supply means such as the bellows.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electric water heater equipped with a safety device of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the safety device in FIG.

FIG. 3 is a vertical sectional view of a conventional electric water heater.

[Explanation of symbols]

 1 Container 12 Steam Passage 19 Steam Passage 21 Projection Piece 22 Spring 23 Spherical Body 25 Steam Pressure Relief Hole

Claims (2)

[Claims] 1. A vertical portion in a steam passage that connects the inside and the outside of an electric water heater having air supply means for pumping air into the container contained in the main body to discharge the liquid in the container to the outside. A steam passage with a narrowed inner diameter is provided on the bottom of the steam passage, and the check valve is urged by a spring so that the steam passage can be closed from the lower surface and has a protruding piece in the central portion that can project beyond the upper surface of the steam passage. A safety device for an electric water heater in which a spherical body capable of deactivating the spring of the check valve via a projection piece is placed on the upper surface of the steam passage. 2. The safety device for an electric water heater according to claim 1, wherein an upper surface side and a lower surface side of a steam passage provided in a vertical portion of the steam passage are communicated with each other, and a steam pressure relief hole having a diameter smaller than that of the steam passage is provided. .