JP2003111671A - Electric water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric water heater which reduces the consumption of electric energy during operating, and, by which only a required amount of boiling water can be obtained by supplying and boiling water after a usage. SOLUTION: A first container 30 and a second container 35 are provided to be adjacent in parallel. Then, water-heating and hot-keeping are performed by the first container 30, and water is automatically fed to the first container 30 from the second container 35 in response to the using status. Thus, hot water of a high temperature can be always obtained. At the same time, the consumption of electric energy at the time of hot-keeping can be reduced.

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 used in a general household or office.

[0002]

2. Description of the Related Art FIG. 9 shows the structure of a conventional electric water heater. In the figure, 1 is a substantially cylindrical container having a heater 2 as a heating device at the bottom, 3 is located below the container 1 and one end communicates with an outlet 4 at the bottom of the container 1 and the other end has a transfer pipe 5
It is a centrifugal pump that is a water supply device communicating with. Reference numeral 6 denotes a temperature detecting element provided on the bottom surface of the container 1 for detecting the temperature of hot water in the container 1. Reference numeral 7 is a heat insulating material provided on the side surface of the container 1.
An operation unit 8 includes operation buttons and a display unit. A control circuit 9 controls the heater 2 and the centrifugal pump 3 by a signal from the operation unit 8.

The operation of the conventional electric water heater constructed as above will be described. First, predetermined water is supplied into the container 1. When the power source is connected, the control circuit 9 starts energizing the heater 2. When the temperature detecting element 6 detects boiling, the control circuit 9 stops energizing the heater 2 and eventually controls the energizing of the heater 2 with a signal from the temperature detecting element 6 to bring the hot water in the container 1 to a predetermined temperature. Keep warm.

Next, when hot water is desired, the operation button of the operation unit 8 is operated to drive the centrifugal pump 3 through the control circuit 9 to supply the hot water in the container 1 through the transfer pipe 5. When the desired amount of hot water is supplied, the operation of the operation buttons is stopped and the process ends.

As for the water level in the container 1, generally, the transfer pipe 5 is made of a transparent glass tube so that the transfer pipe 5 can be seen from the outside. The water supply system was generally used.

[0006]

The structure of the conventional electric water heater has an uneconomical structure in which all the hot water in the container 1 must be constantly heated and kept warm. Further, even when the amount of hot water becomes small and water is added, the whole hot water temperature is lowered, so that it is necessary to reheat the whole hot water, and there is a problem that hot water cannot be immediately obtained.

In this electric water heater, first, it is required that the hot water is always kept at a high temperature of about 95 degrees. Secondly, it is required to have a compact shape and a space-saving configuration that can be easily placed in a kitchen or the like. Thirdly, the water supply section is required to have a structure that facilitates easy water supply. Fourthly, a structure for detecting the amount of water in a container equipped with a heating device is required. Fifth, there is a demand for a configuration having a water supply detection function for detecting that the water supply unit supplies the rated amount of water. Sixth, the function of detecting the rated capacity in a container equipped with a heating device is required. Seventh, a function of automatically supplying water into a container having a heating device is required. Further, eighthly, the function of automatically supplying water into the container having the heating device is required to be activated while the hot water supply operation is not performed.

In order to solve the above-mentioned conventional problems, the first object of the present invention is to keep a practically sufficient amount at a high temperature all the time. A practically sufficient amount of hot water is generally about 500 ml. The reason is about 150m for instant coffee
Although it is about 1, about 500 ml of cup noodles or the like is required, and as a result of investigating the usual purpose, the required amount of hot water was 500 ml or less. Secondly, it is intended to have a space-saving structure as a compact structure. Thirdly, it is an object to have a structure having a detachable water supply tank. A fourth object is to have a configuration having a function of detecting the liquid level of the heating container. A fifth object is to provide the water supply unit with a water supply detection function for detecting the amount of water.
Sixthly, the purpose of detecting the liquid level of the heating container is to provide a structure having a water supply detecting function for detecting the rated liquid level. A seventh object is to have a structure having a function of automatically supplying water from a water supply tank to a container having a heating device. Eighthly, the purpose of automatically supplying water from a water supply tank to a container having a heating device is to have a configuration having a function of performing automatic water supply operation other than during hot water supply operation. Ninth, the purpose is to notify when the water in the water supply tank has passed for a certain period of time and replace it before the propagation of various bacteria.

[0009]

In order to solve the above-mentioned conventional problems, the present invention provides a first container provided with a heating device, a second container attached to the first container, and the first container. A first transfer pipe opening to the tap hole in the container, a first transfer device provided in the middle of the first transfer pipe for transferring the liquid in the first container, and A first liquid level detection device for detecting a liquid level, a second transfer pipe for transferring a liquid from the second container to the first container, and the second transfer pipe provided in the middle of the second transfer pipe. A second transfer device for transferring the liquid from the second container to the first container; a control circuit for controlling the first liquid level detection device and the second transfer device; and an operation section of the control circuit. It is configured to have.

As a result, a practically necessary amount of hot water can be obtained, and at the same time, when the amount of hot water decreases, water is automatically supplied to suppress the power consumption required for heat retention.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises a first container provided with a heating device, a second container provided in the first container, and a first container. A first transfer pipe having one end opened and the other end communicating with a tap hole and opening outward, and a liquid in the first container provided in the middle of the first transfer pipe in one outward direction A first transfer device for transferring to
A first liquid level detection device for detecting a liquid level in the first container; a second transfer pipe having one end opened in the second container and the other end opened in the first container; A second transfer device provided in the middle of the second transfer pipe to transfer the liquid in one direction from the second container to the first container; the first liquid level detection device and the second transfer device; The control circuit for controlling the device and the operation part of the control circuit are provided, and the required amount of high-temperature hot water can be obtained and at the same time, the power consumption required for heat retention can be suppressed.

According to a second aspect of the present invention, in the structure according to the first aspect, the first container has a substantially cylindrical shape, and the second container has a substantially rectangular parallelepiped shape. A main body containing the container and the second container, and a transfer pipe arranged in one of the two gap spaces formed by the first container and the second container, and the operating portion on the other. Therefore, it is possible to have a space-saving configuration.

The invention according to claim 3 is the same as claim 1 or
In the configuration described in 2, the second container is configured such that the opening with the second transfer device is watertightly attachable and detachable, and only the second container can be carried and supplied with water when water is supplied. Light weight and easy water supply.

The invention described in claim 4 is the invention according to claims 1 to 4.
In the configuration according to any one of 1 above, the first liquid level detection device is arranged in the middle of the first transfer pipe, and can detect the liquid level of the first container and also detect the flow of hot water during hot water supply. it can.

The invention according to claim 5 is the invention according to claims 1 to 4.
In the configuration according to any one of the items 1 to 3, a second liquid level detection device that detects the liquid level of the second container is provided, and full water detection of the second container can be performed.

The invention according to claim 6 is the same as claims 1 to 5.
In the configuration according to any one of 1 above, the first liquid level detection device is configured to detect the rated liquid level of the first container, and when the water tank is filled with water more than or equal to full water, You can always see how much you have used and the amount of liquid in the water tank.

The invention described in claim 7 is from claim 1 to claim 6.
In the configuration according to any one of 1 above, an integration unit that integrates the operating time of the first transfer device in the control circuit, and an integration reset unit that resets the integration unit with a signal from the first liquid level detection device, The control unit includes a comparison unit that compares the value of the integration unit with a predetermined value, and the control unit drives the second transfer device when the integration value is larger than the predetermined value as a result of the comparison unit, and further drives the second transfer device. When the first liquid level detection device detects the liquid level, the second transfer device is stopped, so that high-temperature hot water can be prepared at all times, and only the necessary volume is kept warm. The power consumption required for this can be minimized.

According to an eighth aspect of the present invention, in the structure according to the seventh aspect, the control circuit includes a delay time section, and when the value of the integrating section is larger than the set value, only the set value of the delay time section is second. It is configured such that the time for driving the transfer device is delayed so that the required amount of hot water is not supplied from the second container to the first container immediately after supplying the desired amount of hot water. Since the water is supplied from the second container to the first container after a while, the hot water temperature does not decrease.

According to a ninth aspect of the present invention, in the configuration according to any one of the first to eighth aspects, a tank sensor for detecting the second container and an alarm means are provided, and when a predetermined time or more has elapsed, the alarm means is provided. It is configured to notify by
It is possible to always prepare safe and sanitary water by informing the user to exchange the water in the second container before the germs and the like propagate in the second container.

[0020]

EXAMPLE 1 Example 1 of the present invention will be described below with reference to the drawings. In FIG. 1, 30
Is a first container, which is formed of a substantially cylindrical stainless steel plate and has a heater 31 as a heating device provided on the bottom surface. The heater 31 is composed of a water heater 32 having a power consumption of about 1000 W and a heat retaining heater 33 having a power consumption of about 100 W. At the time of boiling water, the water is heated by the boiling water heater 32 to boil the water, and when the temperature is close to boiling, the energization rate is gradually changed so as to weaken the force of steam generated at boiling. After boiling, the heat-retaining heater 33 maintains a temperature of about 95 degrees. 34 is the first container 3
It is a temperature detecting element that is provided in the vicinity of the heater 31 at the bottom of 0 and is heat-sensitive to detect the hot water temperature through the bottom surface of the first container 30, and is formed of a thermistor. The first container 30 is filled with about 1 liter.

Reference numeral 35 denotes a second container, which has a substantially rectangular parallelepiped shape and has substantially the same height as the first container 30, and the positions of the bottom surface of the first container 30 are substantially the same. It is a tank made of transparent plastic material that holds about 2 liters of water. The second container 35 is provided with a water supply port 36 on the bottom by opening the upper side and a scale 37 on the side surface to show the water level of the internal volume by utilizing the transparency of the material.

Reference numeral 38 is a hot water supply port provided at the bottom of the first container 30. Reference numeral 39 denotes a first transfer pipe which is vertically positioned near the first container 30, and is formed of a glass pipe so that the water level inside can be seen. Reference numeral 40 denotes a first centrifugal pump which is a first transfer device, one end of which is connected to the hot water supply port 38 and the other end of which is connected to the first transfer pipe 39 and the other end of which is directed outward through a hot water outlet 41. It is open to.

Reference numeral 42 is a second transfer pipe having one end opened above the first container 30 and the other end communicated with the water supply port 36 on the bottom surface of the second container 35, and the glass pipe is connected with silicone rubber. is doing. A second centrifuge 43 is a second transfer device that is located near the bottom surface of the second container 35 in the middle of the second transfer pipe 42 and supplies water from the second container 35 to the first container 30. It is a pump. Since the opening 44 of the second transfer pipe 42 opens at a position higher than the position of the first full scale 45 of the first container 30, even if the first container 30 becomes full, the opening 44 becomes water. Never soak.

Reference numeral 46 is a first optical sensor which is a first liquid level detecting device provided in the middle of the first transfer pipe 39. As shown in FIG. 3, the first optical sensor 46 is composed of a light emitting diode 47 and a light receiving diode 48 with the first transfer tube 39 interposed therebetween. The optical axis of the light emitting diode 47 is slightly off the center of the first transfer tube 39. The glass tube forming the first transfer tube 39 is transparent, and the optical axis of the light from the light emitting diode 47 when the water is present therein is different from that when the water is present therein.
When the light reaches 8 and water is present, the light does not reach.
The water level is detected by detecting this difference.

Reference numeral 49 designates a second portion mounted in the middle of the second transfer pipe 42 so as to detect the full water position of the second container 35.
It is a second optical sensor which is a liquid level detection device. The structure is the same as that of the first optical sensor 46 already described, and the description thereof will be omitted.

Reference numeral 50 denotes a control circuit which is provided near the lower portion of the first container 30 and which incorporates a microcomputer, which is substantially sealed by an upper waterproof holder 51 and a lower waterproof holder 52. The control circuit 50 includes a first optical sensor 46, a second optical sensor 49, a first centrifugal pump 40, and a second optical sensor 49.
The centrifugal pump 43 and the heater 31 are electrically connected and control them.

As shown in FIG. 2, 53 is located in the front part between the first container 30 and the second container 35, and the control circuit 50 is provided.
Is an operation section for operating the, and is formed along the outer contour of the main body 54.

Reference numeral 55 is a transparent window provided at a position where the first transfer pipe 39 can be seen from the outside. At the same time that the first transfer pipe 39 can be seen through the window 55, a water level graduation 56 is provided on the window so that the amount of hot water in the first container 30 can be confirmed by the water level.

Reference numeral 57 is a power supply port, and power is supplied by a magnet type plug 58. When the plug 58 is pulled, the coupling due to the magnetic force of the magnet is released and the power supply is stopped.

Reference numeral 59 denotes a heat insulating material which is wound around and fixed to the first container 30, and is formed by enclosing silicon oxide powder in a bag formed by laminating a resin film and an aluminum foil.

The control circuit 50 includes an integrating unit 60 for integrating the operating time of the first centrifugal pump 40 and a integrating unit for generating a signal when the first optical sensor 46 detects that the first container 30 is full. The integration reset unit 61 that resets the count of 60, the comparison unit 62 that compares the value of the integration unit 60 with the value of the capacity that is half the capacity of the first container 30, and the control circuit 50 that receives a signal from the comparison unit 62. And a delay time section 63 for sending a signal for driving the second centrifugal pump 43 after 1 minute. When the integrated value of the operation of the first centrifugal pump 40 exceeds a predetermined value (500 ml), the comparison unit 62 causes the delay time unit 63 to
The delay time unit 63 sends a signal for driving the second centrifugal pump 43 to the control circuit 50 after 1 minute. The control circuit 50 confirms that the first centrifugal pump 40 is not operated and drives the second centrifugal pump 43 to transfer the water in the second container 35 to the first container 30. When the first optical sensor 46 detects that the first container 30 is full of water, the control circuit 50 stops driving the second centrifugal pump 43. Even if the delay time section 63 outputs a signal after 1 minute, the control circuit 50
If it is determined that the first centrifugal pump 40 is being driven, a signal is sent to the comparison unit 62 to activate the delay time unit 63 again, and the first centrifugal pump 40 must be driven for at least one minute later. The second centrifugal pump 43 is configured not to operate.

The operation of the electric water heater configured as described above will be described with reference to FIG. First, the second
The container 35 is filled with water. Confirm that the second optical sensor 49 has an appropriate amount that is not more than full water. The first optical sensor 46 detects that the first container 30 is not full and sends a signal to the control circuit 50. The control circuit 50 drives the second centrifugal pump 43 to supply water from the second container 35 to the first container 30. Eventually the first optical sensor 46
Detects that the first container 30 has reached full water, and the control circuit 50 stops the second centrifugal pump 43. The first container 30 is filled with about 1 liter. Next, the water in the first container 30 is boiled by the boiling water heater 32 of the heater 31. When the hot water is boiled, the temperature detecting element 34 detects it and the control circuit 5
In 0, the warming heater 33 adjusts the temperature of the hot water to about 95 degrees. At this time, there is about 1 liter of hot water in the first container 30. Generally, when the capacity is small, there is a tendency that the power consumption during heat retention is small. When keeping about 1 liter of hot water, the average power consumption is about 15W.

When 200 ml of hot water is desired, the operating portion 53 is operated to drive the first centrifugal pump 40 to drive the first container 3
Hot water is obtained from the hot water outlet 41 from 0 through the first transfer pipe 39.

At this time, the integrating unit 60 of the control circuit 50 is
The value converted from the driving time of the centrifugal pump 40 into the amount of 200 ml of hot water discharged is accumulated and held. Control circuit 50
The comparing unit 62 compares the value of the integrating unit 60 (200 ml) with the half capacity value (500 ml) of the first container 30 and determines that the integrated amount is smaller. The next hot water supply operation similarly obtains 400 ml of hot water. Also at this time, the integrating unit 60 determines that the hot water supply amount (400 m
l) is converted and integrated. In the comparison unit 62, the integrated value (600 ml) and half the volume value of the first container 30 (5
It is judged that the accumulated amount is large. The comparison unit 62 sends a signal to the delay time unit 63 and the delay time unit 63.
Then, a signal is sent to the control circuit 50 after 1 minute. The control circuit 50 drives the second centrifugal pump 43 after confirming that the hot water discharge operation is not performed by the operation unit 53. Water is supplied into the first container 30, and the first optical sensor 46 detects that the first container 30 is full.
The control circuit 50 stops the second centrifugal pump 43. First
Since the water is supplied into the container 30 of No. 3, the hot water temperature is lowered. The temperature detecting element 34 detects that the temperature of the hot water in the first container 30 has dropped and sends a signal to the control circuit 50. The control circuit 50 energizes the boiling water heater 32 to boil the water in the first container 30 in about 4 minutes, and thereafter the temperature is kept by the warming heater 33 at about 95 degrees.

When the control circuit 50 receives the signal from the delay time section 63 and detects that the hot water supply operation is being performed by the operation section 53, the control circuit 50 sends a signal to the comparison section 62 to perform the comparison operation again. The comparison unit 62 sends the signal again to the delay time unit 63. The delay time unit 63 sends a signal to the control circuit 50 after 1 minute. If the hot water supply operation is being performed during this time, this operation is repeated until the hot water supply operation is completed, and it is confirmed that the hot water supply operation has been completed. Then, the control circuit 50 drives the second centrifugal pump 43 to remove the water in the second container 35 from the first container 30.
Water is supplied through the second transfer pipe 42. Eventually, the water in the first container 30 becomes full, and the first optical sensor 46 detects full water. The control circuit 50 is the first centrifugal pump 40.
Stop driving. Since the first container 30 is supplied with water, the hot water temperature is lowered. The temperature detecting element 34 detects the temperature of the hot water in the first container 30 and the control circuit 50 energizes the heater 31. Then, the water in the first container 30 boils and the temperature is kept at about 95 degrees.

When the amount of water in the second container 35 is low, the water supply is completed by supplying water to the second container 35 immediately after or immediately before the use of hot water. It is possible to always obtain high-temperature hot water without lowering the temperature of the hot water stored in the container 30.

Although the value of the integrating unit 60 includes an error, when the first optical sensor 46 detects the fullness of the first container 30 when supplying water to the first container 30, The error can be canceled by resetting the value of the unit 60.

As described above, according to this embodiment, firstly, 1 liter of hot water, which is a practically sufficient amount, is always maintained at a high temperature, and when the amount of hot water becomes small, it is automatically supplied with water to keep it warm. You can Thus, the required amount of hot water is always secured and the shortage of hot water is constantly replenished to boil water, so that the required amount of hot water can be secured and the heat insulating power can be reduced at the same time. Secondly, the first container 30 and the second container 35 can be made compact and space-saving. Thirdly, the first container 30 has a function of detecting the full water level of the first container 30.
It is possible to supply water up to full. Fourth to first
It is possible to always store hot water in the first container 30 by automatically supplying water to the container 30 from the second container 35.
Fifthly, the hot water can be always obtained from the second container 35 in the first container 30 by the automatic water supply operation other than during the hot water supply operation.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings. In FIGS. 5 to 8, 30 is a first container, 31 is a heater, 32 is a water heater, 33 is a heat retention heater, 34 is a temperature detecting element, 37 is a scale, 38 is a hot water supply port, 39 is a first transfer pipe. , 40 is a first centrifugal pump, 41 is a tap hole, 42 is a second transfer pipe, 43 is a second centrifugal pump, 44 is an opening, 4
5 is the first full scale, 46 is the first optical sensor, 4
7 is a light emitting diode, 48 is a light receiving diode, 49 is a second optical sensor, 51 is an upper waterproof holder, 52 is a lower waterproof holder, 53 is an operating part, 54 is a main body, 55 is a window, 56 is a water level scale, and 57 is Power supply port, 58 is a plug,
59 is a heat insulating material, 60 is an integrating unit, 61 is an integrating reset unit,
Reference numeral 62 is a comparison unit and 63 is a delay time unit. The above is the same as the configuration of the first embodiment shown in FIGS.

The second container 7 is different from the structure of the first embodiment.
0 is configured to be detachable from the main body 54, and the tank sensor 71 is positioned below the second container 70 to detect the second container 70. In FIG. 7, 72 is the second
It is a water supply port formed in the lower part of the container 70. Water supply port 7
Since 2 has a structure in which the second container 70 can be attached and detached, the O-ring (oring) 73 and the check valve 74 can be attached and detached to the second container 70 side in a watertight manner and the main body 54 side can be sealed. The part 75 is formed.

As shown in FIG. 8, the control circuit 76 is provided with a water supply integrating section 77. The water supply integrating unit 77 integrates the time since the tank sensor 71 detected the second container 70. Each time the tank sensor 71 detects the second container 70, the water supply integrating unit 77 is reset. The control circuit 76 has a predetermined time (for example, 24 hours) and the tank sensor 7
An integrated time comparison unit 78 for comparing the integrated time since the first detection of the second container 70 is provided. Reference numeral 79 denotes a light emitting diode which constitutes an informing means, and when the control circuit 76 does not generate a signal by the integrated time comparison unit 78 for more than 24 hours without attaching or detaching the second container 70, the operation unit 53 receives it. The light-emitting diode 79 of No. 3 emits light to notify.

The operation of the electric water heater constructed as above will be described below. , The second container 70 is removed from the main body 54 and water is added. As it is removable, the second container 70 can be taken to the faucet. Then, the second container 70 containing water is set in the main body 54. At this time, the tank sensor 71 is in the second container 70.
And sends a signal to the water supply integrating unit 77. Water supply integration section 7
7 performs the integration of time. The integration time comparison unit 78 compares the value of the water supply integration unit 77 with the set value of 24 hours. At this time, if the integrated value of the water supply integrating unit 77 is longer than 24 hours, the integrated time comparing unit 78 sends a signal to the control circuit 76, and the control circuit 76 lights the light emitting diode 79 of the operation unit 53 to cause the inside of the second container 70. Warn you to replace your water with fresh water.

When the second container 70 is detached from the main body 54, the tank sensor 71 sends a signal to the control circuit 76 to reset the integrated value of the water supply integrating section 77, and the light emitting diode 79 is turned off. After that, the value of the water supply integrating unit 77 and the set value (24 hours) are compared by the integration time comparing unit 78, and if it is longer than 24 hours, the control circuit 76 turns on the light emitting diode 79.

As described above, the water supply work can be easily performed by making the second container 70 detachable, and the second container 70 is provided with the tank sensor 71.
By detecting the attachment / detachment of water, the water in the second container 70 is prevented from being supplied to the first container 30 after being left for a long period of time, thereby preventing the growth of various bacteria and the like and providing a safe and delicious hot water. Can be obtained.

Although the second container 70 is separated from the main body 54 at the water supply port 72 in the second embodiment, a part of the second centrifugal pump 43 may be a part of the second container 70. In addition, in this embodiment, the tank sensor 71 is used for the second container 7.
Although the attachment / detachment of 0 is detected, the detection principle may be weight detection or optical detection by a photodiode.
It goes without saying that it is only necessary to detect attachment / detachment of 0.

Further, although the light emitting diode 79 is used as the notification means in the present embodiment, a device for emitting a notification sound such as a buzzer may be used.

[0047]

As described above, according to the electric water heater of the present invention, it is possible to always obtain a high temperature hot water of an amount necessary for practical use, and at the same time, it is possible to suppress the power consumption required for heat retention. Further, it is possible to obtain a high temperature hot water while delaying the decrease in the hot water temperature due to the supplied water and using the hot water. Further, at the time of water supply, only the second container can be carried and supplied with water, and lightweight and simple water supply can be performed. Further, when a certain time or more has elapsed after the water supply, the notification means notifies that the water in the container is replaced. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric water heater according to a first embodiment of the present invention.

FIG. 2 is a top view of the main body of the electric water heater according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of the essential parts of the electric water heater according to the first embodiment of the present invention.

FIG. 4 is an operation relationship diagram of each part of the electric water heater according to the first embodiment of the present invention.

FIG. 5 is a sectional view of an electric water heater according to a second embodiment of the present invention.

FIG. 6 is a top view of the main body of the electric water heater according to the second embodiment of the present invention.

FIG. 7 is a sectional view of a main part of an electric water heater according to a second embodiment of the present invention.

FIG. 8 is an operation relational diagram of each part of the electric water heater according to the second embodiment of the present invention.

FIG. 9 is a cross-sectional view of a conventional electric water heater.

[Explanation of symbols]

30 First container 31 Heater (heating device) 35 Second Container 39 First transfer pipe 40 First Centrifugal Pump (First Transfer Device) 41 Outlet 42 Second transfer pipe 43 Second centrifugal pump (second transfer device) 44 opening 46 First Optical Sensor (First Liquid Level Detector) 49 Second optical sensor (second liquid level detection device 9 50 control circuit 53 Operation part 54 body 60 integrating section 61 Totalization reset section 62 comparison section 63 Delay time section 70 Second container 71 Tank sensor 76 Control circuit 77 Water supply integration section 78 Integrated time comparison unit 79 Light emitting diode (informing means)

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Claims (9)

[Claims] 1. A first container provided with a heating device, a second container juxtaposed to the first container, one end of the first container opened and the other end communicating with a tap hole First opening towards
Transfer pipe, a first transfer device provided in the middle of the first transfer pipe for transferring the liquid in the first container in one outward direction, and a liquid level in the first container is detected. A first liquid level detecting device, a second transfer pipe having one end opened in the second container and the other end opened in the first container, and provided in the middle of the second transfer pipe. A second transfer device for unidirectionally transferring liquid from the second container to the first container, a control circuit for controlling the first liquid level detection device and the second transfer device, and the control An electric water heater having a circuit operating part. 2. A main body having a substantially cylindrical shape for the first container, the second container as a substantially rectangular parallelepiped and being installed side by side with the first container, and the built-in first container and second container. 2. The electric water heater according to claim 1, wherein a transfer pipe is arranged in one of two gap spaces formed by the first container and the second container, and an operating portion is provided in the other. 3. The electric water heater according to claim 1 or 2, wherein an opening of the second container with respect to the second transfer device is watertightly removable. 4. The electric water heater according to any one of claims 1 to 3, wherein the first liquid level detection device is arranged in the middle of the first transfer pipe. 5. The electric water heater according to claim 1, further comprising a second liquid level detecting device for detecting the liquid level of the second container. 6. The electric water heater according to claim 1, wherein the first liquid level detecting device detects the rated liquid level of the first container. 7. An integration unit for integrating the operating time of the first transfer device in the control circuit, an integration reset unit for resetting the integration unit with a signal from the first liquid level detection device, and a value of the integration unit. And a comparison unit that compares the predetermined liquid level with a predetermined value, and the control unit drives the second transfer device to detect the first liquid level when the integrated value is larger than the predetermined value as a result of the comparison unit. The electric water heater according to any one of claims 1 to 6, wherein the second transfer device is stopped when the device detects a liquid level. 8. The control circuit includes a delay time section, and when the value of the integration section is larger than a set value, the time for driving the second transfer device is delayed by the set value of the delay time section. The electric water heater described. 9. The electric water heater according to claim 1, further comprising a tank sensor for detecting the second container and an alarm means, and alarming when a predetermined time or more has elapsed.