JP3171135B2 - Electric water heater - Google Patents

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 for heating and heating water contained in a container.

[0002]

2. Description of the Related Art Conventionally, there have been the following means for removing scale or the like adhering to a container when used for a long time.

[0003] That is, after the water is filled and the cleaning agent is added, the power is turned on, the energizing means is driven, and the water in the container is boiled or kept at a predetermined temperature or higher. The container was washed by maintaining it.

[0004] In recent years, some apparatuses have been provided with a dedicated cleaning mode for reducing the cleaning time to less than a predetermined time and improving the cleaning effect.

[0005]

However, such a conventional configuration has the following problems. That is, when the cleaning agent is introduced in a state where the temperature of water is low, the cleaning agent precipitates at the bottom of the container. When the heating means is energized in this state, the cleaning agent is heated and the temperature at the bottom of the container is rapidly increased. In particular, when the detergent is settled on the temperature detecting means contact portion, the effect is transmitted to the temperature detecting means, and the influence is transmitted to the temperature detecting means.
A temperature gradient like 1 is shown. Then, since the temperature rise is steeper than the boundary of the temperature rise gradient of the empty cooking detection indicated by the wavy line, the energization is stopped.

In addition, since the user is instructed to mix the cleaning agent and water and then to energize the cleaning agent so that the cleaning agent does not settle on the contact portion of the temperature detecting means, the operation becomes inconvenient. I was

An object of the present invention is to solve such a problem, and it is an object of the present invention to prevent an erroneous detection of empty cooking even if a user does not mix water after adding a cleaning agent.

[0008]

According to the present invention, there is provided a container for storing a liquid, a heating unit for heating the liquid in the container, and an energizing unit for controlling energization of the heating unit. , a temperature detecting means for detecting the temperature in the container, a heating starting means for starting the kettle mode by driving the heating means, a cleaning start device for starting the container cleaning mode for cleaning in the container, wherein Liquid in container
Means for measuring the amount of water, said on / off means
When the washing start means is input, the water amount measuring means
By a predetermined control method determined according to the detected water volume
The electric heater drives the energizing means .

In other words, when the container cleaning mode for cleaning the inside of the container is executed, the power of the heating means is reduced to reduce the difference between the temperature of the container at the joint of the heating means and the temperature rise of the temperature detecting means. The configuration is such that erroneous detection of empty cooking is prevented by stopping the heating means when the temperature detection means rises to a controllable low temperature above the boiling point which never rises when liquid is present.

[0010] Accordingly, even if the cleaning agent is settled at the bottom of the container only by selecting the container cleaning mode by the cleaning start means, the inside of the container can be easily and reliably secured without the need to stir after adding water. It is possible to provide a convenient electric water heater that can be cleaned at a convenient time.

[0011]

According to the first aspect of the present invention, there is provided a container for storing a liquid, a heating unit for heating the liquid in the container, and an energizing unit for controlling energization of the heating unit. Means, temperature detection means for detecting the temperature in the container, heating start means for driving the heating means to start the kettle mode, and cleaning start means for starting the container cleaning mode for cleaning the inside of the container. In the container
A water amount measuring means for measuring a liquid amount, wherein the on / off
When the washing start means is input, the water amount measuring means
According to a predetermined control method determined according to the amount of water detected by the stage.
Thus, an electric water heater for driving the energizing means is provided.

Further, the invention according to claim 2 is provided with a decrease detecting means for re-activating the water amount detecting means when a predetermined temperature decrease is detected during the container cleaning mode.

Further, the invention according to claim 3 is provided with a notifying means for notifying the outside when it detects that the water amount measured by the water amount measuring means is out of a specific range.

Further, the invention according to claim 4 is configured such that the on / off means stops the energization when the water quantity measured by the water quantity measuring means detects that it is out of a specific range.

[0015] With the above configuration, the empty cooking in the container cleaning mode can reduce the power consumption of the heating means.
The temperature detecting means can detect whether or not the temperature has reached a predetermined temperature, prevent erroneous detection of empty cooking, and surely wash the container.

In an electric water heater having a plurality of containers, an optimum on / off time is automatically set for each container, so that washing can be performed efficiently.

If the amount of water is small, the upper part of the container is not washed, and the washing effect is reduced, so that the user can be encouraged to increase the amount of water.

[0018]

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram of an electric water heater according to a first embodiment of the present invention. Reference numeral 1 denotes a container for storing a liquid, 2 denotes a heating means for contacting the container 1 and heating water in the container 1, and 3 denotes a container 1 Temperature detecting means 4 for detecting the temperature in the container 1 which is in contact with the heating means 2 is an energizing means for energizing the heating means 2.

Reference numeral 6 denotes a heating start means, which means all of the methods for starting the heating of the liquid in the container, for example, a heating start switch for forcibly starting the heating, or the input of the temperature detecting means 3 is the first. Automatic boiling means for automatically starting water heating when the temperature falls below a predetermined temperature (in this embodiment, 90 ° C.).

Reference numeral 5 denotes a boiling detecting means. When the heating means 2 is driven to enter the water heating mode, the input of the temperature detecting means 3 detects a temperature equal to or higher than a second predetermined temperature (about 80 ° C. in the present embodiment). A predetermined unit temperature (in the present embodiment, about 0.1 mm).
5 ° C.) The time for each rise is measured, and if the predetermined unit temperature does not rise even after the lapse of a second predetermined time (25 seconds in this embodiment), the energizing means 4 is stopped and the water heater mode is ended. I do.

7 is a cleaning start means, 8 is an on / off means,
When the cleaning start means 7 is input, the heating means 2 is controlled by the ON / OFF means 8 to a predetermined control method (in this embodiment, ON for 15 seconds and OFF for 30 seconds for a first predetermined number of times (200 times in this embodiment). The power of the heating means 2 is reduced.

Reference numeral 9 denotes a stopping means, which stops the temperature detected by the temperature detecting means 3 above a third predetermined temperature (120 ° C. in the present embodiment) which does not rise when there is a liquid in the container. Upon detection, the drive of the on / off means 8 is stopped.

Numeral 10 denotes an empty cooking detection means, and a heating start means 6
When the heating is started by the input of, the time for each rise of the predetermined unit temperature is measured, and it is determined that the measurement time is shorter than a first predetermined time (0.8 seconds in this embodiment). When it is detected, it is determined that the cooking is empty, and the drive of the energizing means 2 is stopped.

FIG. 2 is a circuit diagram of the electric water heater according to the first embodiment of the present invention. In FIG. 2, 11 is an AC power supply, 1
2 is a DC power supply. The heating means 2 comprises a first heating element 2a for heating the liquid in the container and a second heating element 2b for heating the liquid in the container with a lower heating power than the first heating element 2a. The energizing means 4 includes relay contacts 4a and 4b connected in series with the respective heating elements of the heating means 2 and the AC power supply 11, and relay coils 4c and 4d for controlling the relay contacts 4a and 4b. A current flows through the coil to close the relay contact.

The temperature detecting means 3 comprises a temperature sensing element 3a for converting a temperature into a resistance value and an AD converter 3b for converting the value of the temperature sensing element 3a into a binary code. The heating start switch of the heating start means 6 allows the energizing means 4 to be forcibly re-energized by this input.
It is composed of a switch 6a and resistors 6b and 6c and sends a signal when the switch is turned on and off.

The washing start means 7 is composed of a switch 7a and resistors 7b and 7c so that the user can freely set it. With this input, the drive of the on / off means 5 is started, or during the container washing mode. Cancels this mode.

Reference numeral 13 denotes a notifying means for notifying the inside of the container that the state of the container is heating, keeping the temperature, or the like to the outside.
a and 13b and a buzzer 13c.
14 is a microcomputer (hereinafter abbreviated as a microcomputer)
It is.

FIG. 3 shows a microcomputer 14 according to the first embodiment of the present invention.
Is a flowchart of an operation portion of the container cleaning mode which is started from turning on the power of the program stored in the boil detecting means 5, on / off means 8,
The control method of the stopping means 9 and the empty cooking detection means 10 is realized. Hereinafter, this operation will be described.

When the power is turned on while the cleaning agent and water are put in the container 1, if the temperature detecting means 2 is lower than the first predetermined temperature (step 21), the heating means 2 is driven by the energizing means 4. (Step 22). Next, it is determined whether or not the predetermined unit temperature has risen for the operation of the empty cooking detection means 10 and the boiling detection means 5 (step 23).

Here, if the predetermined unit temperature has not risen, the measurement of the time is continued, and
If the temperature equal to or higher than the predetermined temperature is detected and the time during which the measurement is continued in step 23 is equal to or longer than the second predetermined time, boiling is detected and the heating means 2 is stopped (step 25). , 26).

On the other hand, when the predetermined unit temperature rise is detected in step 23, the measured time is compared with a first predetermined time in step 24, and if less than the first predetermined time, the heating means 2 is turned off. It turns off and shifts to the empty cooking mode for performing the empty cooking notification. If it is longer than the first predetermined time, the measuring time is cleared and the processing shifts to the next step.

If boiling has not been detected in steps 25 and 26, it is determined in step 27 whether or not an input from the cleaning start means 7 has been made. If there is no input here, step 22
And the measurement of the unit temperature rise time is continued.

When there is an input from the cleaning start means 7 in step 27, a counter for counting the number of times of the on / off control is initialized (step 28), and the heating means 2 is driven by the on / off control method (steps 29 to 33). In the meantime, in step 31, the temperature detecting means 3 determines whether or not the temperature has reached the third predetermined temperature. When the temperature is equal to or higher than the third predetermined temperature, the process shifts to the process of idling.

When the on / off control method is completed up to step 33, the counter is counted up (step 34), and it is determined whether the first predetermined number of times has been performed (step 35).
If it has been completed, the heating means 2 is stopped in step 36, the container washing mode is ended, and the mode is shifted to the warming mode.

With the above operation, even if the temperature detecting means 3 rises sharply by the cleaning agent, the container cleaning mode can be reliably executed to the end.

In the present embodiment, the energizing time in step 29 is from the start of the cleaning in step 27, but may be the total of the energizing times from step 22. Further, when the time required to reach step 29 exceeds 15 seconds, the heating means 2 is controlled so as to omit step 29, and it is also possible to suppress a rise in temperature during empty cooking.

In the implementation of the on / off control method, whether the temperature is equal to or higher than the third predetermined temperature is determined only when the heating means is off, but it is also possible to detect when the heating means is on.

If the end of the cleaning is set to the warming mode, the user may drink hot water containing the cleaning agent. Therefore, there is a method of shifting to a new mode indicating the end of the cleaning.

Further, the heating means 2 when the on / off control is off can turn off both the first and second heating means, or can turn off only the first heating means.

As described above, the cleaning efficiency can be easily and surely improved simply by inputting the cleaning start means at the beginning of the water heater mode.

Embodiment 2 FIG. 4 is a block diagram of an electric water heater according to a second embodiment of the present invention. The difference from FIG. 1 is that a water amount measuring means 15 is provided. The water amount measuring means 15 measures the temperature rise gradient during the washing of the container, and sets a predetermined number of times of repeating the on / off control method according to the gradient to set an efficient cleaning time according to the water amount. It is composed.

FIG. 5 shows a microcomputer 14 according to a second embodiment of the present invention.
Is a flowchart of an operation portion of the container cleaning mode which is started from turning on the power of the program stored in the boil detecting means 5, on / off means 8,
Stop means 9, empty cooking detection means 10, and water amount measurement means 1
5 is realized. Hereinafter, this operation will be described.

When the power is turned on while the cleaning agent and water are put in the container 1, if the temperature detecting means 2 is lower than the first predetermined temperature (step 41), the heating means 2 is turned on by the energizing means 4. Is driven (step 42). next,
For the operation of the empty-cooking detecting means 10 and the boiling detecting means 5, it is determined whether the predetermined unit temperature has risen (step 4).
3).

If the predetermined unit temperature has not risen, the measurement of the time is continued, the temperature detecting means 3 detects the temperature equal to or higher than the second predetermined temperature, and the measurement is continued at step 43. If the time is longer than the second predetermined time, boiling is detected and the heating means 2 is stopped (steps 45 and 46).

On the other hand, when the predetermined unit temperature rise is detected in step 43, the measured time is compared in step 44 with a first predetermined time. Is turned off to shift to the empty cooking mode for performing the empty cooking notification, and if it is longer than the first predetermined time, the measurement time is cleared and the processing proceeds to the next step.

If boiling has not been detected in steps 45 and 46, it is determined in step 47 whether or not an input from the cleaning start means 7 has been made. If there is no input here, step 42
And the measurement of the unit temperature rise time is continued.

When there is an input from the cleaning start means 7 in step 47, a counter for counting the number of times of on / off control is initialized (step 48), and the first predetermined number is set as a limiter value (step 49). Next, measurement of temperature rise for measuring the amount of water is started (step 50). Thereafter, the heating means 2 is driven by the on / off control method (steps 51 to 55). Meanwhile, step 54
Then, the temperature detecting means 3 determines whether or not the temperature has reached the third predetermined temperature, and when the temperature is equal to or higher than the third predetermined temperature, the process shifts to the process of idling.

When the on / off control method is completed up to step 55, the counter is counted up (step 56), and it is determined whether or not the value of the counter is a specified number of times (10 in this embodiment) (step 5).
7). At this specific number of times, the measurement of the temperature rise started in step 50 is terminated (step 58), and if this temperature rise width is larger than the first temperature width (14 ° C. in the present embodiment), the second temperature rise is measured. Predetermined number of times (in this embodiment, 150
(Steps 59 and 6)
0).

At step 57, the value of the counter is 10
Otherwise, it is determined whether or not the on / off control has been performed by the limiter value (step 61). If not completed, the process returns to step 51, and if completed, the process proceeds to step 62.
To stop the heating means 2 to end the container washing mode and shift to the heat retaining mode.

As described above, in this embodiment, it is generally assumed that the water is filled when the container is washed.
By classifying the water volume measurement only into the type of the container capacity, it is possible to automatically determine the container and perform efficient cleaning for each container.

In the present embodiment, the measurement of the amount of water is detected based on the temperature rise during the specific time, but it is also possible to measure the time during the rise of the specific temperature.

In this embodiment, two types of container capacity are described. However, N levels can be provided according to the type of container.

(Embodiment 3) FIG. 6 is a block diagram of an electric water heater according to a third embodiment of the present invention. The difference from FIG. 4 is that a drop detecting means 16 is provided. This drop detecting means 16 restarts the water amount measuring means 15 when detecting a temperature drop with a specific temperature gradient (3 ° C./6 seconds in this embodiment) from the input of the temperature detecting means 3 during the container washing mode. It is configured to be.

FIG. 7 shows a microcomputer 14 according to a third embodiment of the present invention.
Is a flowchart of an operation portion of the container cleaning mode which is started from turning on the power of the program stored in the boil detecting means 5, on / off means 8,
The control method of the stopping means 9, the empty cooking detection means 10, the water amount measurement means 15, and the decrease detection means 16 is realized. Hereinafter, this operation will be described.

When the power is turned on while the cleaning agent and water are put in the container 1, if the temperature detecting means 2 is lower than the first predetermined temperature (step 71), the heating means 2 is turned on by the energizing means 4. It is driven (step 72). Next, it is determined whether the predetermined unit temperature has risen for the operation of the empty cooking detection means 10 and the boiling detection means 5 (step 7).
3).

Here, if the predetermined unit temperature has not risen, the measurement of the time is continued, the temperature detection means 3 detects the temperature equal to or higher than the second predetermined temperature, and the measurement is continued at step 73. If the remaining time is longer than the second predetermined time, boiling is detected and the heating means 2 is stopped (steps 75 and 76).

On the other hand, when the predetermined unit temperature rise is detected in step 73, the measured time is compared with a first predetermined time in step 74, and if it is shorter than the first predetermined time, the heating means 2 Is turned off to shift to the empty cooking mode for performing the empty cooking notification, and if it is longer than the first predetermined time, the measurement time is cleared and the processing proceeds to the next step.

If boiling has not been detected in steps 75 and 76, it is determined in step 77 whether or not an input from the cleaning start means 7 has been made. If there is no input here, step 72
And the measurement of the unit temperature rise time is continued.

When there is an input from the washing start means 7 at step 77, a counter for counting the number of times of on / off control is initialized (step 78), and the first predetermined number is set as a limiter value (step 79). Next, start measuring the temperature rise for measuring the amount of water (step
80). Thereafter, the heating means 2 is driven by the on / off control method (steps 81 to 87). Meanwhile step 8
At 6, the temperature detecting means 3 determines whether or not the temperature has reached the third predetermined temperature. When the temperature is equal to or higher than the third predetermined temperature, the process shifts to the process of idling. Steps 82 and 85
In step 78, it is detected whether or not the temperature has dropped by the specific temperature gradient.
I try to return to.

When the on / off control method ends at step 87, the counter is counted up (step 88), and it is determined whether or not the value of the counter is the specific number of times (step 89). Here, at the specific number of times, the measurement of the temperature rise started in step 80 is terminated (step 90), and the temperature rise width is determined by the first range.
If the temperature width is larger than the temperature range, the limiter value is reset to the second predetermined number of times (steps 91 and 92).

In step 89, the value of the counter is 10
Otherwise, it is determined whether or not the on / off control has been performed by the limiter value (step 93). If not completed, the process returns to step 81;
To stop the heating means 2 to end the container washing mode and shift to the heat retaining mode.

As described above, in the present embodiment, even if water is added after the start of cleaning of the container, efficient cleaning according to the amount of water can be reliably performed in order to measure the amount of water again.

(Embodiment 4) FIG. 8 is a block diagram of an electric water heater according to a fourth embodiment of the present invention. The difference from FIG. 1 is that an alarm unit 13 and a water amount measuring unit 15 are provided. This water amount measuring means 15
The temperature rise gradient immediately after the start of container cleaning is measured, and if this gradient is large, it is determined that the amount of water is small,
Is configured to notify the user that the amount of water in the container is low by sound or display.

FIG. 9 shows a microcomputer 14 according to a fourth embodiment of the present invention.
Is a flowchart of an operation portion of the container cleaning mode which is started from turning on the power of the program stored in the boil detecting means 5, on / off means 8,
The control method of the stopping means 9, the empty cooking detection means 10 and the water amount measuring means 15 is realized. Hereinafter, this operation will be described.

When the power is turned on while the cleaning agent and water are put in the container 1, if the temperature detecting means 2 is lower than the first predetermined temperature (step 101), the heating means 2 is turned on by the energizing means 4. It is driven (step 102). next,
For the operation of the empty-cooking detecting means 10 and the boiling detecting means 5, it is determined whether the predetermined unit temperature has risen (step 1).
03).

Here, if the predetermined unit temperature has not risen, the measurement of the time is continued, and the
If the temperature equal to or more than the predetermined temperature is detected and the time during which the measurement is continued in step 103 is measured for the second predetermined time or more, the boiling is detected and the heating means 2 is stopped (step 105). , 106).

On the other hand, if the predetermined unit temperature rise is detected in step 103, the measured time is compared with a first predetermined time in step 104, and if less than the first predetermined time, the heating means 2 is turned off. It turns off and shifts to the empty cooking mode for performing the empty cooking notification. If it is longer than the first predetermined time, the measuring time is cleared and the processing moves to the next step.

If boiling has not been detected in steps 105 and 106, it is determined in step 107 whether or not an input from the cleaning start means 7 has been made. If there is no input here, the process returns to step 102, and the measurement of the unit temperature rise time is continuously performed.

When there is an input from the cleaning start means 7 in step 107, a counter for counting the number of times of the on / off control is initialized (step 108). Next, the measurement of the temperature rise for measuring the amount of water is started (step 10).
9). Thereafter, the heating means 2 is driven by the on / off control method (steps 110 to 114). Meanwhile step 1
At 13, the temperature detecting means 3 determines whether or not the temperature has reached the third predetermined temperature. When the temperature is equal to or higher than the third predetermined temperature, the process shifts to the process of idling.

When the on / off control method ends at step 114, the counter is counted up (step 115), and it is determined whether or not the value of the counter is the specific number of times (step 116). At times, the measurement of the temperature rise started in step 109 is terminated (step 117). If the temperature rise width at this time is larger than the second temperature width (18 ° C. in the present embodiment), the notifying unit 13 is driven to notify the user that the amount of water is small (Step 119), and Step Return to 110.

On the other hand, if the value of the counter is other than 10 in step 116, it is determined whether or not the on / off control has been performed the first predetermined number of times (step 120). If completed, the heating means 2 is stopped in step 121, the cleaning mode is terminated, and the mode is shifted to the heat retaining mode.

As described above, in the present embodiment, when the cleaning is to be performed with the amount of water smaller than the rated capacity of the container by a certain amount or more, the user can be notified of the fact.

(Embodiment 5) FIG. 10 is a flowchart showing an operation portion of a container cleaning mode starting from power-on of a program stored in a microcomputer 14 according to a fifth embodiment of the present invention. This realizes a control method of the boiling detecting means 5, the on / off means 8, the stopping means 9, the empty cooking detection means 10 and the water amount measuring means 15. Hereinafter, this operation will be described.

When the power is turned on with the cleaning agent and water in the container 1, if the temperature detecting means 2 is lower than the first predetermined temperature (step 131), the heating means 2 is driven by the energizing means 4. Is performed (step 132).

Next, it is determined whether the predetermined unit temperature has risen for the operation of the empty cooking detection means 10 and the boiling detection means 5 (step 133).

Here, if the predetermined unit temperature has not risen, the measurement of the time is continued, and the
If the temperature equal to or more than the predetermined temperature is detected and the time during which the measurement is continued in step 133 is equal to or longer than the second predetermined time, boiling is detected and the heating means 2 is stopped (step 135, 136).

On the other hand, when the predetermined unit temperature rise is detected in step 133, the measured time is compared with the first predetermined time in step 134, and if it is less than the first predetermined time, the heating means 2 is turned off. It turns off and shifts to the empty cooking mode for performing the empty cooking notification. If it is longer than the first predetermined time, the measuring time is cleared and the processing moves to the next step.

If boiling has not been detected in steps 135 and 136, it is determined in step 137 whether or not an input from the cleaning start means 7 has been made. If there is no input here, the process returns to step 132, and the measurement of the unit temperature rise time is continuously performed.

When there is an input from the cleaning start means 7 in step 137, a counter for counting the number of times of the on / off control is initialized (step 138). Next, measurement of temperature rise for measuring the amount of water is started (step 13).
9). Thereafter, the heating unit 2 is driven by the on / off control method (steps 140 to 144). Meanwhile step 1
In step 43, the temperature detecting means 3 determines whether or not the temperature has reached the third predetermined temperature, and when the temperature is equal to or higher than the third predetermined temperature, the process proceeds to the process of idling.

When the on / off control method is completed up to step 144, the counter is counted up (step 145), and it is determined whether the value of the counter is the specific number of times (step 146). At this specific number of times, the measurement of the temperature rise started in step 139 is terminated (step 147), and if this temperature rise width is smaller than the second temperature width, the process directly proceeds to step 140 to turn on / off the temperature. The control is continued, but if the temperature is larger than the second temperature range, the notifying unit 13 is driven to notify the user that the amount of water is small (step 14).
9), the heating means 2 is turned off. Steps 149 and 15 until the washing start means 7 is input again after the water addition.
0 is continued (step 151). When the washing start means 7 is input in step 151, the notifying means 13 is stopped (step 152), and the processing is started again from step 138.

On the other hand, when the value of the counter is other than 10 in step 146, it is determined whether the on / off control has been performed the first predetermined number of times (step 153). If completed, the heating means 2 is stopped in step 154, the cleaning mode is terminated, and the mode is shifted to the heat retention mode.

As described above, in the present embodiment, when the cleaning is to be performed with a water amount smaller than the rated capacity of the container by a certain amount or more, the fact is notified to the user, and the heating is stopped. Washing can be prevented.

In the present embodiment, the notification means 13 keeps the notification until the cleaning start means 7 is re-input, but the notification time may be set to a predetermined time.

Further, a means for detecting a temperature drop is provided,
When the water is added, it is possible to automatically start the container washing even if the washing start means 7 is not input.

[0085]

As apparent from the above embodiment, claim 1
According to the described invention, only by selecting the container washing mode by the washing start means, even in a state where the detergent is settled at the bottom of the container, the inside of the container can be easily formed without the need to stir after adding water. Can be reliably washed , container capacity
The cleaning time is set according to the
A convenient electric water heater that can be purified can be provided.

[0086] Furthermore, according to the electric water heater according to claim 2, it is possible to provide an effective cleaning is possible electric kettle even consider it when water was later spliced.

According to the third aspect of the present invention, it is possible to provide a convenient electric water heater that informs a user when only a liquid smaller than the rated capacity of the container is charged.

According to the electric water heater of the fourth aspect, when only a liquid smaller than the rated capacity of the container is charged, the user is informed of the fact and the cleaning is interrupted, so that the wasteful cleaning is performed. No convenient electric kettle can be provided.

[Brief description of the drawings]

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

FIG. 2 is a circuit diagram of the electric water heater.

FIG. 3 is a flowchart of a part of the electric kettle operating in a container washing mode.

FIG. 4 is a block diagram of an electric water heater according to a second embodiment of the present invention.

FIG. 5 is a flowchart of an operation portion of a container cleaning mode of the electric water heater.

FIG. 6 is a block diagram of an electric water heater according to a third embodiment of the present invention.

FIG. 7 is a flow chart of an operation portion of the electric kettle in a container cleaning mode.

FIG. 8 is a block diagram of an electric water heater according to a fourth embodiment of the present invention.

FIG. 9 is a flowchart of a part of the electric kettle operating in the container cleaning mode.

FIG. 10 is a flowchart of a container cleaning mode operation portion of the electric water heater according to the fifth embodiment of the present invention.

FIG. 11 is a diagram showing a temperature rise of a temperature detecting means when a cleaning agent is supplied in a conventional heating control method for an electric water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Heating means 3 Temperature detection means 4 Current supply means 6 Heating start means 7 Cleaning start means 8 On / off means 9 Stop means

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 27/21 101 A47J 27/00 109

Claims (4)

(57) [Claims] A container for storing a liquid; a heating unit for heating the liquid in the container; an energizing unit for controlling energization of the heating unit; a temperature detecting unit for detecting a temperature in the container; a heating start device for the heating means is driven to start the kettle mode, a cleaning start device for starting the container cleaning mode for cleaning in the container, and on-off means for driving the front Symbol energizing means, the liquid in the container Measure the amount
Means for measuring the amount of water,
When the start means is inputted, the water detected by the water amount measuring means is detected.
The energizing operation is performed by a predetermined control method determined according to the amount.
Electric kettle that drives the stage . Wherein upon detecting a predetermined temperature drop in the container cleaning mode, according to claim 1, wherein the electric kettle with a decrease detecting means for re-driving the water sensing means. 3. The electric water heater according to claim 2 , further comprising a notifying means for notifying the outside when the amount of water measured by the water amount measuring means is out of a specific range. 4. The electric water heater according to claim 3 , wherein the on / off means stops energization when the water quantity measured by the water quantity measuring means detects that the water quantity is out of a specific range.