JPH11137438A - Electric water boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that hot water or air is jetted forcibly by providing a lid for closing an upper opening of a container with plural through holes communicating the upper space of the container with the outer space to gradually release pressure in the container to the outside even if the main body is overturned. SOLUTION: At the time of initial water boiling, some of boiled steam is dissipated from a vent hole 21 through a piercing hole 41 to the space between a lid main body 13 and an outer shell body 12, and some of the steam passed through the vent hole 21 is passed through a by-path 40 and a steam path 17 to be dissipated to the outside through a steam hole 16. When the thus constructed water boiler is overturned, hot water in the container flows out to the steam path 17 through a shielding hole 15, but at this time, the shielding hole 15 is water-tightly closed by a steel ball 19. When the air in the container is expanded and the internal pressure is gradually increased, the air or hot water passed through the piercing hole 41 is let flow out from the space between the outer shell body 12 and the lid main body 13, and the air or hot water passed through the by-path 40 is let flow out of the steam hole 16 to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater mainly used in ordinary households or offices.

[0002]

2. Description of the Related Art Conventionally, this type of electric water heater is as shown in FIG. Reference numeral 1 denotes a container formed of a stainless steel plate, which is provided with a heater 2 constituting a heating device at the bottom and is built in a main body 3. Reference numeral 4 denotes an electric centrifugal pump. Reference numeral 5 denotes a water pipe. One end of the water guide pipe 5 communicates with the centrifugal pump 4 which is a water supply device, and the other end is formed of a ceramic or the like having a specific gravity greater than 1 and has an inverted conical sliding part 6 provided at its lower part. It communicates with the storage section 8 for storing. Reference numeral 9 denotes a circular seal provided above the storage unit 8. An outflow pipe 10 has one end communicating with the seal portion 9 and the other end opened outward, and has an approximately L-shape.

A lid 11 covers the upper part of the container 1 and closes in a watertight manner. The lid 11 is a shell 1 made of synthetic resin.
2, a lid body 13 made of synthetic resin, and a lid body 13
A protective plate 14 is formed by press-forming a stainless steel plate attached to the lower part. A shield hole 15 is provided in the lid body 13, and a steam hole 16 is provided in the outer shell 12. The shielding hole 15 and the steam hole 16 communicate with each other through a steam passage 17. Reference numeral 18 denotes a moving chamber extending below the shielding hole 15, and a steel ball 19 is housed therein so as to be vertically movable. When the steel ball 19 moves upward, it comes into contact with the shielding hole 15 and closes it in a watertight manner, and when it moves downward, it comes into contact with the protection plate 14. Usually, the steel ball 19 is located below.

[0004] Reference numeral 20 denotes a packing attached to the outer periphery of the protection plate 14, which seals the outer periphery of the container 1 and the lid body 13 in a watertight manner. The space between the protection plate 14 and the lid main body 13 and the space above the container 1 communicate with each other through a ventilation hole 21 provided in the protection plate 14.

The operation of the electric water heater constructed as described above will be described. The hot water in the container 1 is sent out by the centrifugal pump 4 and flows into the storage section 8 via the water pipe 5. Since the specific gravity of the falling outflow prevention valve 7 is greater than 1, the hot water flowing into the storage section 8 usually bypasses the falling outflow prevention valve 7 and flows out of the seal section 9 through the outflow pipe 10 to the outside.

When the main body 3 falls down, the hot water in the container 1 passes through the water pipe 5 via the centrifugal pump 4 and flows into the storage section 8. At this time, while the sliding portion 6 of the overturning / outflow preventing valve 7 slides on the storage portion 8, the overturning / outflow preventing valve 7 moves to the seal portion 9, and seals the seal portion 9 in a watertight manner. As described above, the hot water flowing into the storage section 8 does not flow out of the outflow pipe 10.

On the other hand, the hot water moved to the upper part of the container 1
Then, the liquid flows out from the ventilation hole 21 of FIG. 4 and moves the moving chamber 18 of the lid body 13 upward from below. At this time, the steel ball 1
9 moves upward from below to close the shielding hole 15, so that hot water does not flow out from the steam passage 17 through the steam hole 16.

[0008]

However, in the above-mentioned conventional construction, the steel ball 19 moves to the shielding hole 15 when it falls down and closes it, but the water pipe 5 side also falls over and the outflow prevention valve. Since 7 closes the seal portion 9, the air in the container 1 is heated and the pressure in the container 1 increases. When the internal pressure rises considerably, air or hot water gushes from the weakest part. The ejection pressure at this time is large, and there has been a problem that hot water and air are ejected vigorously.

The present invention solves the above-mentioned conventional problems, and comprises a container having an upper opening and provided with a heating device, a water supply device, and a lid for closing an opening of the container. As a structure with a plurality of through holes communicating the upper space of the container and the outer space, even if the main body is turned over, the pressure inside the container is gradually released to the outside, and the air in the container is reliably discharged. An object of the present invention is to provide an electric water heater that can be used.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a container having an upper opening and a heating device, and a lid for closing an opening of the container. This is a configuration in which a plurality of through holes communicating the upper space of the container and the outer space are provided.

Thus, even if the main body is turned over, the pressure in the container can be gradually released outward, and the air in the container can be reliably discharged.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention comprises a container having an upper opening and provided with a heating device, and a lid for closing an opening of the container. It has a structure with multiple through holes that communicate the upper space and the outer space, and even if the main body is overturned, the pressure inside the container is gradually released to the outside and the air inside the container is reliably discharged. It has the effect that it can be done.

According to a second aspect of the present invention, two through holes are provided at positions substantially symmetric with respect to the approximate center point of the container. Can be released to the outside of the lid body.

According to a third aspect of the present invention, the diameter of the through-hole is set to about 2 mm or less. In normal use, water droplets stay in the through-hole to prevent steam from leaking. Has the effect of being able to.

According to a fourth aspect of the present invention, there is provided a container having an opening at an upper portion and provided with a heating device, and a lid for closing an opening of the container. A through hole communicating with a space formed between the container upper space, the lid shell, and the lid main body, comprising a vapor passage communicating from the upper space to the outside and a tipping / falling prevention device provided in the middle of the vapor passage. And the hot water flowing out of the through hole or the bypass is retained in the space formed by the lid body and the outer body or in the steam passage. It has the effect that the outflow from the main body can be suppressed.

According to a fifth aspect of the present invention, the inner diameter of the through hole and the bypass is set to about 2 mm or less, and during normal use, water leaks in the through hole or the bypass so that steam leaks. Can be prevented.

According to a sixth aspect of the present invention, at least one of the through hole and the bypass is formed to have a depth greater than the wall thickness in the vicinity, and water drops stay in the through hole or the bypass during normal use. In this way, there is an effect that leakage of steam can be prevented.

[0018]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIGS. Container 1, heater 2, main body 3, centrifugal pump 4, water guide tube 5, sliding portion 6, falling outflow prevention valve 7, storage portion 8, seal portion 9, outflow tube 10, lid 11, outer shell in conventional embodiment. 12, the lid body 13, the protection plate 14, the shielding hole 15, the steam hole 16, the steam passage 17, the moving chamber 18, the steel ball 19, the packing 20, and the ventilation hole 21 have the same shape, material and function, and have the same name. Use numbers.

Reference numeral 30 denotes a through hole provided at a position symmetrical with respect to the center of the lid body 13, and is provided so as to penetrate the upper surface and the lower surface. A cylindrical rib 31 is provided on the outer periphery of the through hole 30.
Are provided, and the depth of the through hole 30 is increased.

In the above configuration, the basic operation is the same as in the conventional example. At the time of the initial boiling, a part of the boiled steam passes through the vent hole 21 and the through hole 30 to form the lid body 13.
And is dissipated into the space between the shell 12 and the outer shell 12. At this time, a part of the vapor is condensed in the through-hole 30 and a film of water is formed in the through-hole 30 by the surface tension. No steam passes through the through hole 30 during the subsequent normal heat retention.

When the main body 3 falls down, the fall-off prevention valve 7 closes the seal portion 9 in a watertight manner in the storage portion 8, while the hot water in the container 1 passes from the ventilation hole 21 through the moving chamber 18 to the shielding hole. 1
5 to the steam passage 17. At this time, the steel ball 19 is pushed by the flowing hot water and moves upward in the moving chamber 18 to close the shielding hole 15 in a watertight manner. As a result, hot water does not flow out to the steam passage 17. The air in the container 1 is expanded by being heated by the heat of hot water, and the internal pressure gradually increases. Here, the lid body 13
The internal pressure is also applied to the through-hole 30 provided in the nozzle, and the water film that has condensed is pushed out by the pressure. There are two through-holes 30, one through which hot water passes and the other through which expanded air passes. Although the same pressure is applied to the two through holes 30, the difference in viscosity between the hot water flowing out and the air is large, and most of the air actually flows out. The air and hot water that have passed through the through hole 30 flow out from between the outer shell 12 and the lid body 13.

As described above, according to the present embodiment, the through hole 3
By providing 0 as a point contrast, it is possible to escape by releasing the air containing a rise in internal pressure when the vehicle falls, and to prevent the pressure in the container 1 from rising more.

(Embodiment 2) A second embodiment of the present invention will be described below with reference to FIG. Container 1, heater 2, main body 3, centrifugal pump 4, water guide tube 5, sliding portion 6, falling outflow prevention valve 7, storage portion 8, seal portion 9, outflow tube 10, lid 11, outer shell in conventional embodiment. 12, lid body 13,
Protection plate 14, shielding hole 15, steam hole 16, steam passage 17,
The moving chamber 18, the steel ball 19, the packing 20, and the ventilation hole 21 have the same shape, material, and function, and use the same name and number.

Reference numeral 40 denotes a bypass having one opening above the container 1 inside the shielding hole 15 of the lid body 13 and the other opening inside the steam passage 17 above the shielding hole 15. 41 is the lid body 1
3 is a through hole provided at a position symmetrical with the bypass 40 with respect to the center of the
To extend the hole depth.

In the above configuration, the basic operation is the same as in the conventional example. Part of the steam boiled at the time of the initial kettle passes through the vent hole 21 and passes through the through hole 41 and is radiated to the space between the lid body 13 and the outer body 12. A part of the steam passing through the vent hole 21 passes through the bypass 40 and passes through the steam passage 17.
Through the steam hole 16 to the outside. At this time, a part of the vapor is condensed in the through hole 41 or the bypass 40 and a film of water is formed in the through hole 41 or the bypass 40 by the surface tension. During the subsequent normal heat retention, no steam passes through the through hole 41 or the bypass 40.

When the main body 3 falls down, the fall-off prevention valve 7 closes the seal portion 9 in a watertight manner in the storage portion 8, while the hot water in the container 1 passes from the ventilation hole 21 through the moving chamber 18 to the shielding hole. 1
5 to the steam passage 17. At this time, the steel ball 19 is pushed by the flowing hot water and moves upward in the moving chamber 18 to close the shielding hole 15 in a watertight manner. As a result, hot water does not flow out to the steam passage 17. The air in the container 1 is expanded by being heated by the heat of hot water, and the internal pressure gradually increases. Here, the lid body 13
The internal pressure is also applied to the through-hole 41 or the bypass 40 provided in the nozzle, and the dewed water film is pushed out by the pressure. Generally, the steam holes 16 are located at the rear of the body, so the bypass 40 is also located at the rear, while the through holes 41 are located relatively forward. In this configuration, when the main body 3 falls down,
Turns over and stops in an arbitrary direction, but hot water passes through one of the bypass 40 and the through hole 41, and expanded air passes through the other. The same pressure is applied to the bypass 40 and the through hole 41, but the difference in viscosity between the hot water and the air flowing out is large, and almost all the air actually flows out. The air or hot water that has passed through the through hole 41 flows out from between the outer shell 12 and the lid body 13. The air or hot water that has passed through the bypass 40 flows out of the steam hole 16 through the steam passage 17.

As described above, according to the present embodiment, at least the hot water or the expanded air is radiated outward from the steam passage 17 at the time of falling, and the air or hot water is discharged from the steam passage 17 from which the steam is originally discharged. Flows out, and the infiltration into the inside of the lid 11 can be suppressed.

Although the number of the through holes 30 is two in the first embodiment, the number of the through holes 30 may be three or more.

In the second embodiment, the number of the through holes 41 is one. However, two or more through holes 41 may be provided as long as they are near the point-to-point position.

[0030]

As described above, the electric water heater according to the first aspect has a container having an opening at the upper side and provided with a heating device, and a lid for closing the opening of the container, wherein the lid is provided above the container. With a configuration in which a plurality of through holes communicating the space and the outer space are provided, even if the main body is overturned, the pressure in the container is gradually released to the outside and the air in the container can be reliably discharged. An electric water heater can be provided.

Further, according to the second aspect of the present invention, the through hole is formed by two holes.
A water heater that can discharge the gas in the container to the outside of the lid body at all times when overturned in any direction by adopting a configuration provided at a position symmetrical with the approximate center point of the container. Can be provided.

According to the third aspect of the present invention, by making the diameter of the through hole less than about 2 millimeters, it is possible to prevent water leakage in the through hole during normal use so as to prevent leakage of steam. A possible electric kettle can be provided.

Further, the invention according to claim 4 has a container having an upper opening and provided with a heating device, and a lid for closing an opening of the container, wherein the lid is an outer body, a lid main body, and the container. A steam passage communicating from the upper space to the outside to the outside, and a tip-over prevention device provided in the middle of the steam passage, and a penetrating passage communicating the space formed between the container upper space, the lid outer body, and the lid body to the lid body. By having a configuration in which a bypass is provided in the steam passage with the hole and the fall-over prevention device interposed therebetween, the hot water flowing out of the through-hole or the bypass is retained in a space formed by the lid body and the outer body or in the steam passage. It is possible to provide an electric water heater that can suppress outflow from the main body to the outside.

According to a fifth aspect of the present invention, the internal diameter of the through hole and the bypass is set to about 2 mm or less, so that water droplets stay in the through hole or the bypass during normal use so that the steam leaks. An electric water heater can be provided which can prevent the water heater.

Further, according to the present invention, at least one of the through hole and the bypass is configured to have a depth greater than the thickness in the vicinity, so that water droplets stay in the through hole or the bypass during normal use. Thus, an electric water heater that can prevent steam from leaking can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lid main body of an electric water heater showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the lid body of the electric water heater.

FIG. 3 is a cross-sectional view of the electric water heater according to the first embodiment of the present invention when it is rolled over.

FIG. 4 is a sectional view of a lid of an electric water heater showing a second embodiment of the present invention.

FIG. 5 is a sectional view of an electric water heater showing a conventional embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Heater (heating device) 4 Centrifugal pump (water supply device) 11 Lid 30 Through-hole

Claims (6)

[Claims] A container having an upper opening and a heating device;
An electric water heater having a lid for closing an opening of the container, wherein the lid is provided with a plurality of through holes communicating the space above the container and an outer space. 2. The electric water heater according to claim 1, wherein two through holes are provided and provided at positions substantially symmetric with respect to the approximate center point of the container. 3. The electric water heater according to claim 1, wherein the diameter of the through hole is about 2 mm or less. 4. A container having an upper opening and a heating device,
A lid for closing the opening of the container, and a lid and a fall-out prevention device provided in the middle of the vapor passage and the vapor passage that communicates outward from the outer body, the lid body, and the space above the container to the lid. An electric water heater having a lid body, wherein a bypass is provided in a steam passage with a through hole communicating with a space formed between the container upper space, the lid shell and the lid body, and a fall-over prevention device. 5. The electric water heater according to claim 4, wherein the inner diameter of the through hole and the bypass is about 2 mm or less. 6. The electric water heater according to claim 1, wherein at least one of the through hole and the bypass has a depth greater than a wall thickness in the vicinity.