JP3633574B2 - Electric water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric water heater having a power saving function for automatically controlling energization to a heating means based on a learning result.
[0002]
[Prior art]
Conventionally, an electric water heater provided with a program timer has been proposed to reduce power consumption.
[0003]
According to the program timer method, the energization is turned off or kept at a low temperature for a time set in advance by the user, and after the set time elapses, the boil is forcibly boiled and then kept at a high temperature or a high temperature.
[0004]
[Problems to be solved by the invention]
However, the conventional configuration is cumbersome because the user needs to set or cancel the program timer every time it is used. In addition, in the case of a configuration where the temperature is kept at a low temperature for a set time, after the set time elapses, even if boiling is not required, the water is forcibly boiled, so an energy saving effect cannot be expected, or a heat is automatically kept from a low temperature to a high temperature. Since it is only shifted to control, even if water is added so as not to perform automatic hot water due to temperature drop during the low temperature heat retention for the set time, hot water will be provided after a set time has passed after a while. However, the hot water is not always delicious hot water that has been boiled and purified. Furthermore, when the set time has elapsed, if the heat retention temperature is changed from low temperature to high temperature and heated with maximum power until it reaches high temperature, the power breaker operates when it overlaps with the operation of other equipment, Since no power is supplied to the device, the subsequent program operation is interrupted, and if the program storage means is not prepared, the program setting must be performed again from the beginning, which is troublesome.
[0005]
The present invention solves the above-mentioned conventional problems, learns the usage pattern of the user, and based on the learning result, keeps the temperature low during the low usage frequency and at the high temperature during the high usage time. If it is detected that water has been added to the extent that the automatic hot water is not used during the low-temperature heat retention when switching from the low-temperature to high-temperature heat control during the usage time period, the heat is maintained at a high temperature after heating to boiling once. The purpose is to improve the usability by automatically avoiding the shut-off operation of the power breaker by automatically controlling the heater heater power on / off duty at this time. To do.
[0006]
[Means for Solving the Problems]
In order to solve the above-described conventional problems, the present invention learns a user's usage pattern, selects a heat retention temperature from low temperature and high temperature based on the learning result, and automatically controls energization to the heating means. In an electric water heater equipped with an automatic power control function, a liquid addition detection means for detecting the addition of water to the extent that automatic water heating is not performed during low temperature heat retention during power saving automatic control based on a learning result, and the liquid addition detection means Based on the input signal, liquid addition is detected Below an automatic boiling temperature lower than the second predetermined temperature. If If the thermal insulation is stopped and heated to boiling, and below the automatic boiling temperature, When shifting to high temperature insulation Stop heat insulation An automatic heating control means for heating the liquid until boiling is provided.
[0007]
As a result, when water is added during low temperature heat retention, which is a non-use time zone during power saving automatic control, Maintain power-saving automatic boiling temperature or higher, then Since it is automatically heated to boiling when shifting to high temperature insulation, it is possible to provide delicious hot water that has been purified by boiling at all times of use.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention has at least two control temperatures of the first predetermined temperature and the second predetermined temperature lower than the first predetermined temperature, and learns the usage pattern of the user. , Equipped with a power-saving automatic control function that selects one of the two control temperatures based on the learning result, and performs temperature control to control the energization of the heating means based on the selected control temperature; Based on the liquid addition detection means for detecting the addition of the liquid during temperature control at the second predetermined temperature and the signal input from the liquid addition detection means, the addition of the liquid is detected. Below an automatic boiling temperature lower than the second predetermined temperature. If If the thermal insulation is stopped and heated to boiling, and below the automatic boiling temperature, When switching from the second predetermined temperature to the temperature control at the first predetermined temperature, Stop heat insulation By having an automatic heating control means that heats the liquid to the boiling by the heating means, even if there is an addition of water that does not perform automatic hot water during the heat retention at the second predetermined temperature, Maintain power-saving automatic boiling temperature or higher, then By always boiling the added water, it is possible to provide the user with delicious water that is always purified during use time.
[0009]
The invention according to claim 2 of the present invention is based on the signal inputted from the liquid addition detecting means according to claim 1 and if the addition of the liquid is not detected, the second predetermined temperature to the first predetermined temperature. Temperature control at the second predetermined temperature by having additional non-detection heating control means for heating the liquid to a third predetermined temperature higher than the first predetermined temperature by the heating means when the temperature control is switched to If the addition of water is not detected to the extent that automatic boiling does not occur at times, the liquid is higher than the first predetermined temperature when changing from the second predetermined temperature to the temperature control at the first predetermined temperature. By raising the temperature to the third predetermined temperature, it is possible to shorten the heat retention stabilization time at the first predetermined temperature, and it is possible to improve the usability.
[0010]
The invention according to the third aspect of the present invention is particularly effective when the liquid is being heated by the automatic heating control means according to the first aspect or the additional undetected heating control means according to the second aspect. By means of the avoidance control means for controlling the power, the operation of avoiding the operation of the power breaker is performed when the hot water is heated by switching the heat retention temperature from the second predetermined temperature to the first predetermined temperature based on the learning result. By carrying out automatically, it becomes unnecessary for the user to be aware of the combined use with other devices, and usability can be improved.
[0011]
The invention according to claim 4 of the present invention has mode change input means for changing the mode, and in particular, when the liquid is heated by the avoidance control means according to claim 3, a signal is received from the mode change input means. Even when the control of the energization rate to the heating means is continued, the user can change the mode without being aware of the combined use with other devices, and the usability can be improved.
[0012]
The invention according to claim 5 of the present invention has temperature selection input means for changing the first predetermined temperature, and particularly from the temperature selection input means during heating of the liquid by the avoidance control means according to claim 3. By continuing control of the power supply rate to the heating means even when receiving a signal, the user can change the set temperature without being conscious of using it with other devices, which improves usability. it can.
[0013]
Claims of the invention 6 In particular, the invention described in claim 1 5 The heating display means for displaying that the liquid is being heated by the automatic heating control means described in the above or the additional non-detection heating control means, from the low temperature keeping temperature in the non-use time zone to the use time zone. It is possible to determine whether or not the heating is being performed when shifting to the high temperature insulation setting, and an effect of preventing overcurrent use is obtained, and an effect of easily informing the user of the operation state is obtained.
[0014]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
(Example 1)
Based on FIG. 1, the electric water heater in Example 1 of this invention is demonstrated. In FIG. 1, 1 is an electric water heater body, 2 is a container for storing a liquid to be heated, 3 is a temperature detection means for detecting the temperature of the liquid in the container 2 attached to the container 2, and 4 is for pumping hot water in the container 2. The discharge means 5 for discharging by means of 5 is a heating means comprising two heaters of 925 W and 75 W, 6 is a use detection means for detecting the actual use of hot water in the container 2 by means of inputs from the heating means 5 and the discharge means 4, 7 The storage means 8 inputs the output from the use detection means 6 at a predetermined cycle (in this embodiment, 20 minutes) and sequentially accumulates it in a plurality of storage areas, and 8 has two modes of a heat retention mode and a boiling mode. In the heat retention mode, the first predetermined temperature (98 ° C. that is set by the user in the present embodiment) and the second predetermined temperature (60 ° C. in the present embodiment) are provided and stored. Based on input from means 7, One temperature is selected from the warm insulation temperatures, and the 75W heater of the heating means 5 is turned on and off based on the relationship between the input from the temperature detection means 3 and the selected warming temperature, and the temperature control is being performed. When the water in the container 2 becomes lower than (selected heat retention temperature-5 ° C.) based on the input from the temperature detection means 3, the mode shifts to the boiling mode and the 925 W heater of the heating means 5 is turned on to detect boiling. Insulation control unit 9 for shifting to the insulation mode, 9 is the addition of water that does not fall below 60 ° C. while the insulation control unit 8 keeps the liquid in the container 2 at 60 ° C. (in this embodiment, the time during which the hot water temperature decreases by 5 ° C.) The liquid addition detection means 10 detects whether or not there has been less than 10 seconds). When the heat insulation control unit 8 shifts from 60 ° C. to 98 ° C., the liquid addition detection means 10 receives an input from the liquid addition detection means 9 to 60 ° C. Water is added during heat insulation control If the Tsu shifted to specialist boil mode, the automatic heating control means for heating the hot water in the container 2 to boiling by 925W heater of the heating means 5, 11 are boiled setting input means for turning on the 925W heater of the heating means 5.
[0016]
The operation of the electric water heater configured as described above will be described in more detail with reference to FIG. FIG. 2 is a flowchart for explaining the control contents of the use detection means 6, the heat retention control unit 8, the liquid addition detection means 9, and the automatic heating control means 10 in Embodiment 1 of the present invention.
[0017]
As shown in FIG. 2, when the electric water heater is turned on, the mode is switched (STEP 1) to the heat retention mode (STEP 2), the boiling mode (STEP 4) or the automatic boiling mode (STEP 3). The use detection means 6 detects the actual use of hot water in the container 2 and uses the use status indicating whether or not the discharge means 4 is discharged and whether or not the boiling setting input means 11 is boiling as a unit time (STEP 9). , STEP 11) Writing into the corresponding area of the storage means 7 (STEP 10, STEP 12). However, the usage status is written in the unit time zone from 1 to area 72 with 20 minutes as the unit time, including the unit time zone including the discharge time and boiling operation time, and the unit time zone before and after that as the usage time. Assume that bands are stored separately as non-use time. Then, the heat retention control unit 8 adjusts the temperature of the hot water in the container 2 by the 98 ° C. heat retention temperature (STEP 25), that is, until the elapse of 24 hours after the reset is released (STEP 13). Based on the automatic boiling temperature of 5 ° C. and 98 ° C. (STEP 26), the heat retaining mode (STEP 27) is maintained or the mode is shifted to the boiling mode (STEP 28). If 24 hours have passed since the reset was released (STEP 13), the thermal insulation control unit 8 reads out the accumulated use result of the corresponding area up to the previous day from the storage means 7 (STEP 14), and according to the actual use of the corresponding time zone (STEP 15). If it is a non-use time zone, 60 ° C. heat retention (STEP 16), and if it is a use time zone and the previous time zone is not 60 ° C. heat insulation (STEP 21), 98 ° C. heat insulation control (STEP 25) is performed.
[0018]
By the way, while the heat retention control unit 8 is maintaining the temperature at 60 ° C. (STEP 16), the liquid addition detecting means 9 detects whether or not water has been added to the container 2 (STEP 17). If the temperature falls below the 60 ° C. automatic boiling temperature (STEP 18), 5 ° C. lower than the 60 ° C. holding temperature (STEP 18), a signal is output to the heat holding control unit 8 so as to shift to the boiling mode (STEP 20). (STEP 18) A 60 ° C. warming water addition flag is set (STEP 19), and a signal is output to the automatic heating control means 10. When the automatic heating control means 10 detects that the actual usage in the corresponding time zone is used (STEP 15) and the previous time zone is 60 ° C. thermal insulation (STEP 21), the automatic heating control means 8 detects the liquid addition detecting means 9. After detecting that water has been added during the 60 ° C. heat retention (STEP 22) based on the input from, after outputting a signal to the liquid addition detection means 9 so as to clear the 60 ° C. heat retention during water addition flag (STEP 23) When shifting to the automatic boiling mode (STEP 24), the operation of the heat retention control unit 8 is stopped until boiling is detected. If no addition of water is detected during the heat retention at 60 ° C. (STEP 22), the operation proceeds to 98 ° C. A signal is output to the heat retention control unit 8 as described above (STEP 27). Then, in the automatic boiling control means 10 (STEP 3), the automatic boiling control means 10 turns on the 925 W heater of the heating means 5 to heat the hot water in the container 2 until it boils, and when boiling is detected (STEP 5), shifts to the heat retention mode. (STEP 6) A signal is output to the heat retention control unit 8 so as to start the operation. In addition, when the heat retention control unit 8 shifts to the boiling mode (STEP 4), the 925 W heater of the heating means 5 is turned on to heat the water in the container 2 until it boils, and when boiling is detected (STEP 7), the flow proceeds to the heat retention mode. (STEP 8).
[0019]
In the present embodiment, the first predetermined temperature is 98 ° C., but there may be another temperature such as 85 ° C., and the second predetermined temperature at this time may be 60 ° C. or lower. This temperature varies depending on the factors. In addition, the first predetermined temperature is single at 98 ° C., but the second predetermined temperature is also 60 ° C. as well as 98 ° C., 85 ° C., 70 ° C., but 85 ° C., 70 ° C., 60 ° C., 55 ° C. A plurality of units such as ° C. can be provided and can be selected by the user.
[0020]
In addition, since the learning memory contents are accumulated for two weeks, even in the unit time zone that has been divided from the usage time in the past, it is changed to the non-use time if it is not used for two weeks.
[0021]
Further, depending on the availability of the storage area of the microcomputer, in this embodiment, the number of areas is set to 72 in units of 20 minutes, but the actual number of usage for 24 hours is stored by setting the number of areas to 144 in units of 10 minutes. It may be an arbitrary number.
[0022]
Further, in this embodiment, if it is detected that water is added so as not to fall below 60 ° C. during the heat retention at 60 ° C., the hot water in the container 2 is removed when the temperature is controlled from 60 ° C. to 98 ° C. It is assumed that heating is performed until boiling, but if addition of water is detected, heating is performed immediately, and when shifting from 60 ° C. to 98 ° C. temperature control, heating may be performed and boiling may not be performed.
[0023]
Further, in this embodiment, the case where a backup battery such as a rechargeable battery is used is not particularly described. However, the actual use of hot water in the container 2 is detected by the use detection means 6 continuously during the backup. If the learning storage contents can be stored by the storage means 7, the actual use can be continuously stored even during the backup.
[0024]
Further, in this embodiment, the time for the hot water temperature to drop by 5 ° C. is set to less than 10 seconds as a threshold value for detecting the addition of water, but this threshold value varies depending on the material and size of the container. Therefore, in this case, a threshold value suitable for the container may be set.
[0025]
Further, in this embodiment, there is one threshold value for detecting the addition of water regardless of the amount of water, but a plurality of threshold values may be provided depending on the amount of water if the capacity of the microcomputer is sufficient.
[0026]
With the configuration as described above, if there is an additional amount of water that does not fall below the low temperature keeping temperature during the non-use time, the hot water in the container 2 is always boiled when shifting to the use time, so the water is always purified. Hot water can be provided to the user.
[0027]
(Example 2)
An electric water heater in Embodiment 2 of the present invention will be described with reference to FIG. Since the main configuration of the electric water heater shown in the second embodiment is the same as that of the first embodiment, only different parts will be described.
[0028]
In FIG. 3, a different part from FIG. 1 will be described. The difference from the first embodiment is that the automatic heating control means 10 functions as a function of the automatic heating control means 10 when the temperature keeping control unit 8 shifts from 60 ° C. to 98 ° C. to keep the temperature at 60 ° C. If the addition of water is not detected during the control, the 925 W heater of the heating means 5 removes the hot water in the container 2 to a third predetermined temperature (98 ° C. + 1 ° C., which is the set temperature by the user regardless of the amount of water in this embodiment). The function of heating to 99 ° C.) is added, and the additional undetected heating means 12 is obtained.
[0029]
The operation of the electric water heater configured as described above will be described in more detail with reference to FIG. FIG. 4 is a flowchart showing the relationship among the electric water heater use detection means 6, the heat retention control unit 8, the liquid addition detection means 9, the heating means 5 and the additional non-detection heating means 12 in Embodiment 3 of the present invention.
[0030]
This embodiment is different from the first embodiment in that a transition to the automatic temperature control mode (STEP 41) is added as a mode branch after power-on (STEP 40), and the heat retention control unit 8 uses the corresponding time zone. When the actual state becomes the use time zone (STEP 15) and the transition from the non-use time zone to the use time zone, that is, the temperature control from 60 ° C. heat retention to 98 ° C. heat insulation (STEP 21), the additional non-detection heating means 12 detects liquid addition When the addition of water that does not fall below 60 ° C. is not detected during the heat retention at 60 ° C. by the signal input from the means 9 (STEP 22), the operation of the heat retention control unit 8 is performed simultaneously with the transition to the automatic temperature control mode (STEP 44). Stop. In addition, in the automatic temperature control mode (STEP 41), the additional undetected heating means 12 turns on the 925 W heater of the heating means 5 to heat the hot water in the container 2 to 99 ° C. (STEP 42), and then shifts to the heat retention mode (STEP 42). (Step 43) A signal is output to the heat retention control unit 8 to start the operation.
[0031]
In this embodiment, heating is performed up to 99 ° C. regardless of the amount of water. However, by detecting the amount of water, even if the heating end temperature is changed depending on the amount of water, such as 99 ° C. or 98 ° C. good.
[0032]
With the above configuration, if there is no addition of water that does not fall below the low temperature holding temperature during the non-use time zone, the hot water in the container 2 is raised to a temperature higher than the heat holding temperature when shifting to the use time zone. By raising the temperature, the time for keeping the temperature stable can be shortened after shifting to 98 ° C., and when there is no need for boiling, the hot water in the container 2 is not boiled, so there is also an energy saving effect. Usability can be improved.
[0033]
(Example 3)
An electric water heater according to Embodiment 3 of the present invention will be described with reference to FIG. In addition, since the main structures of the electric water heater shown in the 3rd Example are the same as Example 2, a different part is demonstrated.
[0034]
In FIG. 5, a different part from FIG. 1 is demonstrated. The difference from the second embodiment is that the energization rate to the 925 W heater of the heating means 5 (15 seconds on and 15 seconds off in this embodiment) is controlled by the input from the automatic heating control means 10 or the additional undetected heating means 12. The control means 12 is newly provided.
[0035]
The operation of the electric water heater configured as described above will be described in more detail with reference to FIG. FIG. 6 is a flowchart showing the relationship among the automatic heating control means 10, the additional undetected heating means 12, and the avoidance control means 13 of the electric water heater in Embodiment 3 of the present invention.
[0036]
This embodiment is different from the first and second embodiments in that the automatic heat control is performed when the heat control unit 8 shifts from the non-use time zone to the use time zone, that is, from 60 ° C. heat hold to 98 ° C. heat control. The heating means 5 in the automatic boiling mode which shifts to the case (Example 1) where the addition of water is detected so as not to fall below 60 ° C. during the heat retention at 60 ° C. by the signal input from the liquid addition detection means 9 by the means 10. The 925 W heater is turned on to heat the hot water in the container 2 until boiling, or the avoidance control means 12 does not detect the addition of the water (Example 2). When the heater is turned on and heated to 99 ° C., the relay is turned off (STEP 63) by the intermittent control (STEP 60, STEP 61, STEP 62) in which the avoidance control means 13 is on for 15 seconds and off for 15 seconds. Is ON (STEP 64), and in the mode branch (STEP 65), if the automatic boiling mode (STEP 66) is heated until boiling is detected (STEP 68), if the automatic temperature control mode (STEP 67), the water temperature is heated to 99 ° C. ( (STEP 69) When each heating is completed, a signal is output to the heat retention control unit 8 so as to shift to the heat retention mode.
[0037]
In this embodiment, heating is performed up to 99 ° C. regardless of the amount of water. However, by detecting the amount of water, even if the heating end temperature is changed depending on the amount of water, such as 99 ° C. or 98 ° C. Good.
[0038]
Further, although the energization ratio is 15 seconds on and 15 seconds off, any energization ratio such as 10 seconds on, 10 seconds off, 30 seconds on and 15 seconds off may be used depending on the contact life of the relay.
[0039]
With the above configuration, when the hot water in the container 2 is heated from the non-use time zone to the use time zone, the operation of the power breaker can be automatically avoided and the usability can be improved.
[0040]
(Example 4)
An electric water heater in Embodiment 4 of the present invention will be described with reference to FIG. In addition, since the main structures of the electric water heater shown in the 4th Example are the same as Example 1, a different part is demonstrated.
[0041]
In FIG. 7, a different part from FIG. 1 will be described. The difference from the first embodiment is that a mode change input means 14 for inputting a mode change (cleaning mode in this embodiment), a set temperature of a first predetermined temperature (two heat retention temperatures of 98 ° C. and 85 ° C. in this embodiment). Temperature selection input means 15 for switching, boiling setting input means 11, mode change input means 14, and post-input detection control means for controlling the temperature of the hot water in the container 2 by the heating means 5 or boiling with the input from the temperature selection input means 15. 16 is newly provided.
[0042]
The operation of the electric water heater configured as described above will be described in more detail with reference to FIG. FIG. 8 is a flowchart showing the relationship among the heating means 5, mode change input means 14, temperature selection input means 15 and post-input detection control means 16 of the electric water heater in Embodiment 4 of the present invention.
[0043]
This embodiment is different from the third embodiment in that the hot water in the container 2 is turned on for 15 seconds on and off for 15 seconds by an input from the avoidance control means 13 (STEP 60, STEP 61, STEP 62). During heating by turning ON (STEP 64), if there is an input from the mode change input means 14 (STEP 80), the mode shifts (STEP 81), and after the mode branch (STEP 82), shifts to the cleaning mode (STEP 85). ) Or when the set temperature is changed from 98 ° C. to 85 ° C. and 85 ° C. to 98 ° C. by the input from the temperature selection input means 15 (STEP 81), the heating means 5 is controlled by the control means 16 after the input detection. By inputting a signal to the Omakase boiling mode (STEP 66), Until it rises (STEP 67), or until the cleaning mode ends (STEP 86) if it is in the cleaning mode (STEP 85), or 99 ° C (STEP 69) in the case of 98 setting in the automatic temperature control mode (STEP 67), Up to 86 ° C. (STEP 84), the relay is turned OFF (STEP 63) or ON (STEP 64) by intermittent energization (STEP 60, STEP 61, STEP 62) of hot water in the container 2 for 15 seconds on and 15 seconds off by input from the heating means 5. It is to continue heating with.
[0044]
In this embodiment, the mode is changed to the cleaning mode. However, after the boiling is completed, the heater is intermittently energized for about 6 minutes to forcibly release the descaling mode, or the program is automatically set after the boiling is completed. It is good also as a timer water heater mode etc. which perform low temperature heat retention control only for time, or perform interruption | blocking control of heater energization.
[0045]
In addition, the intermittent energization is continued until boiling once, but the user intentionally switches the mode, so if the measure for the power breaker is not required, the intermittent energization is not continued when the mode is switched. It may be changed to energization or may be changed so as to increase the energization rate and continue intermittent energization.
[0046]
With the configuration as described above, it is assumed that there is a mode transition such as switching of the set temperature and transition to the cleaning mode while hot water in the container 2 is automatically heated by intermittent energization in order to avoid the operation of the power breaker. However, since the operation of the power breaker is automatically avoided, the user does not need to be aware of the combined use with other devices, and the usability can be improved.
[0047]
(Example 5)
An electric water heater in Embodiment 5 of the present invention will be described with reference to FIG. In addition, since the main structures of the electric water heater shown in the 5th Example are the same as Example 3, a different part is demonstrated.
[0048]
In FIG. 9, parts different from FIG. 5 will be described. The difference from the third embodiment is that the presence / absence of water addition indicating whether or not water is added that does not fall below 60 ° C. during the 60 ° C. heat retention control is displayed (LCD display in this embodiment). 17 is newly provided.
[0049]
The operation of the electric water heater configured as described above will be described in more detail with reference to FIG. FIG. 10 is a flowchart showing the relationship between the liquid addition detecting means 9 and the water addition presence / absence display means 17 of the electric water heater in Embodiment 5 of the present invention.
[0050]
In the present embodiment, the difference from the first embodiment is that if the addition of water that does not fall below 60 ° C. is detected by the liquid addition detection means 9 (STEP 90) during the 60 ° C. heat retention in the non-use period, a signal is sent to the LCD. Is displayed to indicate that the addition of water to the extent that it does not fall below 60 ° C. is detected during the 60 ° C. heat retention in the non-use time zone (STEP 91).
[0051]
In this embodiment, the LCD is used as the water addition presence / absence display means, but an LED, sound, or the like may be used.
[0052]
With the above configuration, by recognizing whether or not water is added to the extent that it does not fall below the low-temperature heat retention temperature in the non-use time zone, it is predicted whether or not to heat up to boiling when moving to the next high-temperature heat retention setting. Thus, the effect of preventing the overcurrent use by avoiding the combined use with other devices in advance can be obtained.
[0053]
(Example 6)
An electric water heater in Embodiment 6 of the present invention will be described with reference to FIG. Since the main configuration of the electric water heater shown in the sixth embodiment is the same as that of the first embodiment, different parts will be described.
[0054]
11 that are different from FIG. The difference from the first embodiment is that the automatic heating control means 10 or the additional undetected heating means that the hot water in the container 2 is being heated by the heating means 5 when the temperature control is controlled from 60 ° C. to 98 ° C. A heating display means 18 for displaying (LED in this embodiment) by inputting a signal from the means 12 is newly provided.
[0055]
The operation and action of the electric water heater configured as described above will be described in more detail with reference to FIG.
[0056]
In this embodiment, the difference from the first embodiment is that the automatic heating control means 10 or additional undetected heating is performed when the temperature is shifted from the non-use time zone to the use time zone, that is, from 60 ° C. heat insulation to 98 ° C. heat insulation control. By inputting from the means 12, the fact that the hot water in the container 2 is being heated by the heating means 5 is displayed by inputting a signal to the LED to indicate that heating is in progress.
[0057]
In this embodiment, the LED is used, but an LCD, a voice, or the like may be used. Moreover, although it may display with the same LED when boiling is necessary or not, it may be displayed with separate LEDs.
[0058]
With the configuration as described above, it is possible to determine whether heating is being performed when shifting from the low temperature holding temperature in the non-use time zone to the high temperature holding setting, and an effect of preventing overcurrent use is obtained. In addition, the user can easily be informed of the driving situation.
[0059]
【The invention's effect】
As described above, the present invention learns the user's life pattern by providing the liquid addition detecting means for detecting the addition of the liquid during the power saving automatic control, and based on the learning result, the time period when the usage frequency is low Is kept at a high temperature during low-temperature and high-use times, and if the addition of water was detected during low-temperature when switching from low-temperature to high-temperature during the use time zone, Maintain power-saving automatic boiling temperature or higher, then Once heated to boiling and then kept warm at a high temperature, it is possible to provide the user with hot water that has always been purified by boiling.
[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 flowchart for explaining the control contents of a use detection unit, a heat retention control unit, and an automatic heating control unit in the first embodiment of the present invention.
FIG. 3 is a block diagram of an electric water heater according to a second embodiment of the present invention.
FIG. 4 is a flowchart for explaining control contents of a heat retention control unit and additional undetected heating means in the second embodiment of the present invention.
FIG. 5 is a block diagram of an electric water heater according to a third embodiment of the present invention.
FIG. 6 is a flowchart for explaining the control contents of a heat retention control unit and avoidance control means in the third embodiment of the present invention.
FIG. 7 is a block diagram of an electric water heater according to a fourth embodiment of the present invention.
FIG. 8 is a flowchart for explaining the control contents of a heating means, a mode change input means, a temperature selection input means, and an input detection control means in the fourth embodiment of the present invention.
FIG. 9 is a block diagram of an electric water heater according to a fifth embodiment of the present invention.
FIG. 10 is a flowchart for explaining the control contents of the water addition presence / absence display means in the fifth embodiment of the present invention.
FIG. 11 is a block diagram of an electric water heater according to a sixth embodiment of the present invention.
[Explanation of symbols]
3 Temperature detection means
4 Discharge means
5 Heating means
6 Use detection means
7 Memory means
8 Thermal insulation control unit
9 Liquid addition detection means
10 Automatic heating control means
11 Boiling setting input means
12 Additional undetected heating means
13 Avoidance control means
14 Mode change input means
15 Temperature selection input means
16 Control means after input detection
17 Water addition presence / absence display means
18 Heating display means

Claims (6)

It has at least two control temperatures of a first predetermined temperature and a second predetermined temperature lower than the first predetermined temperature, learns the usage pattern of the user, and controls the two types of control based on the learning result A power-saving automatic control function is provided to select one of the temperatures and perform temperature control for energizing and controlling the heating means based on the selected control temperature, and at the time of temperature control at the second predetermined temperature Based on a liquid addition detecting means for detecting the addition of liquid and a signal input from the liquid addition detecting means, if the addition of the liquid is detected and the temperature falls below the automatic boiling temperature lower than the second predetermined temperature , the heat retention is operated. Stop and heat to boiling, and if the temperature does not fall below the automatic boiling temperature , when the temperature control is switched from the second predetermined temperature to the first predetermined temperature, the heat retaining operation is stopped and the liquid is heated. Heated to boiling by Electric kettle, characterized in that it comprises an automatic heating control means that. If the addition of the liquid is not detected based on the signal input from the liquid addition detecting means, the liquid is heated by the first predetermined temperature by the heating means when the temperature control is switched from the second predetermined temperature to the first predetermined temperature. The electric water heater according to claim 1, further comprising additional non-detection heating control means for heating to a third predetermined temperature higher than the temperature. The electric water heater according to claim 1 or 2, further comprising an avoidance control means for controlling an energization rate to the heating means while the liquid is being heated by the automatic heating control means or the additional undetected heating control means. A mode change input means for changing the mode is provided, and the control of the energization rate to the heating means is continued even when a signal is received from the mode change input means while the liquid is heated by the avoidance control means. The electric water heater according to 3. A temperature selection input means for changing the first predetermined temperature is provided, and while the liquid is being heated by the avoidance control means, the control of the power supply rate to the heating means is continued even when a signal is received from the temperature selection input means. The electric water heater according to claim 3.   The electric water heater according to any one of claims 1 to 5, further comprising a heating display means for displaying that the liquid is being heated by the automatic heating control means or the additional undetected heating control means.

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