JP2001330315A - Electric water-heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in a conventional electric water-heater in which water heat-up is done during the daytime hours at a higher electric rate, even when a hot-water supply can be managed if remaining water in a water-storage tank is used, especially in the time period after the evening till beginning of the night hours. SOLUTION: The electric water heater is provided with a heating body 8 having a power supply either in the daytime hours or in the night hours, a temperature sensor 9, a flow sensor 7 detecting hot-water supply volume other than a water-storage tank 2, a discriminator where to which time period the energization belongs, the daytime hours, or the night hours, and a memory means for storing a record of current-passing to the heating body 8 in the past night hours. When the flow sensor 7 detects in daytime hours a water- supply amount of at least a predetermined amount corresponding to the past energization-time record to the heating body 8 in the past night hours stored in the memory means, the heating body 8 is energized to heat up water, and a time elapsed from the daytime hours is counted from the start of the daytime hours, and if the elapsed time has reached a predetermined time, the current- carrying to the heating body 8 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to boiling control of an electric water heater using both daytime power and nighttime power systems.

[0002]

2. Description of the Related Art In general, the primary purpose of an electric water heater is to supply hot water as required by a user, and it has been necessary to eliminate running out of hot water in order to achieve this purpose. The configuration and boiling control of a conventional electric water heater will be described below. FIG. 9 is a configuration diagram of a conventional electric water heater, and FIG. 10 is an operation flowchart of the conventional electric water heater.

In FIG. 9, a hot water storage tank 2 for storing hot water is disposed in a water heater main body 1. A water supply pipe 3 is connected to the bottom of the hot water storage tank 2, and water is supplied to the hot water storage tank 2 at a constant pressure by a pressure reducing valve 5 provided in the middle of the water supply pipe 3. A hot water supply pipe 4 is connected to an upper portion of the hot water storage tank 2. Hot water heated in the hot water storage tank 2 is opened by opening a hot water supply valve (not shown) provided on the hot water supply pipe 4. The water is supplied to the kitchen, bath, or the like via the hot water supply pipe 4 by the action of the pressure, and an amount of water equal to the hot water supply amount is supplied from the water supply pipe 3 to the lower portion of the hot water storage tank 2. At this time, a pressure relief valve 6 is provided in the middle of the hot water supply pipe 4 in order to keep the inside of the hot water storage tank 2 at a constant pressure.

A heating element 8 for heating water in the hot water storage tank 2 is provided at a lower portion in the hot water storage tank 2, and a boiling temperature, a supply water temperature, and a remaining water temperature are provided on a side outside the hot water storage tank 2. A temperature sensor 9 capable of detecting the amount of hot water is attached. Further, in the water heater main body 1, there is installed a control unit 10 that detects a power supply time zone from the current time or the like, determines whether the time zone is the daytime power or the nighttime power, and controls the boiling of the hot water storage tank 2. Have been. The control section 10 is electrically connected to an operation section 11 such as a remote controller which is provided outside the heating element 8, the temperature sensor 9 and the water heater main body 1 and instructs a user to boil hot water. That is, the control unit 10 is configured to control the energization of the heating element 8 based on the detection value of the temperature sensor 8 and the input value from the operation unit 11.

Next, the boiling control operation of the conventional electric water heater having the above configuration will be described with reference to the operation flowchart of FIG. First, in step S1, when the power supply (not shown) of the water heater main body 1 is turned on, the electric water heater starts energization control, and in step S2, the control unit 10 detects the current time. When the current time is detected, step S3
Then, it is determined whether the current time zone is the daytime zone (from 7:00 in the morning to 11:00 p.m.) or the night time zone (from 11:00 p.m. to 7:00 in the next morning).

If it is determined in step S3 that the current time is not during the daytime (in the case of nighttime), the process proceeds to step S6, in which the heating element 8 is energized, and the temperature sensor 9 detects the boiling temperature in step S7. When the boiling temperature rises to a predetermined temperature T ° C., for example, 90 ° C., the power supply to the heating element 8 is stopped in step S8, and the power supply control is ended in step S9. On the other hand, if it is determined in step S3 that it is during the daytime, the process proceeds to step S4 and the control unit 10
Calculates the amount of remaining hot water in the hot water storage tank 2 based on the detection value of the temperature sensor 9. In other words, when the temperature sensor 9 detects the temperature of the supply water, it means that the low-temperature water has been pushed up to the temperature sensor 9 mounting position of the hot water storage tank 2, it means that there is no predetermined amount of remaining hot water, and the temperature sensor 9 When a temperature equal to or higher than the water temperature is detected, hot water is secured at least above the mounting position of the temperature sensor 9, which means that there is a remaining amount of hot water equal to or more than a predetermined amount.

Accordingly, in step S5, the control unit 10 determines the remaining hot water amount, and when it is determined that the remaining hot water amount is less than the predetermined amount, proceeds to step S6, and secures the predetermined hot water amount in a sense of preventing running out of hot water. Therefore, the power supply to the heating element 8 is started, and the water in the hot water storage tank 2 is cooled to a predetermined temperature T ° C. (90 ° C.).
C.), the process proceeds to step S8 to stop the energization, and ends the energization control in step S9. On the other hand, if the control unit 10 determines in step S5 that there is a remaining amount of hot water equal to or more than the predetermined amount, there is no fear of running out of hot water, and the necessary amount of hot water is secured. Is not performed.

[0008]

The conventional electric water heater is
During the time of daytime electric power, the temperature of water at the temperature sensor 9 mounting portion of the hot water storage tank 2 is detected, and from the detected value, whether or not there is a remaining amount of hot water equal to or greater than a predetermined amount is determined based on whether there is hot water up to the temperature sensor 6 mounting portion. It was to judge. And hot water storage tank 2
In order to prevent the inside of the hot water from running out, when the remaining hot water amount becomes equal to or less than a predetermined amount, the heating element 8 is immediately turned on to start boiling. Therefore, the daytime power period (from 7:00 to 11:00) is higher than the nighttime power period (from 11:00 to 7:00 the next morning), even though the electricity bill is set higher. Among them, there is a problem that the heating element 8 is most often energized and boiled in the evening time zone when a large amount of hot water is used. In particular, this tendency was remarkable as the mounting position of the temperature sensor 9 was lower in the hot water storage tank 2.

[0009] Further, in the daytime power time zone, since the water is heated to the same temperature as the temperature at the time of the nighttime power time, there is a lot of boiling in the daytime time zone where the electricity cost is high, and the electricity bill becomes high. was there. Furthermore, in order to perform the same boiling control as in winter, even in summer when the amount of hot water used is small,
There was also a problem that electricity bills were wasted in summer.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and restricts the supply of electricity to unnecessary heating elements during the daytime when electric power is high, thereby reducing the electricity bill. It is an object of the present invention to provide an electric water heater that can be kept inexpensive and can prevent running out of hot water.

[0011]

SUMMARY OF THE INVENTION The present invention provides a heating means to which daytime or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, and a temperature sensor for detecting a boiling temperature and a feedwater temperature. And a flow rate sensor that detects the amount of hot water supplied to the outside, and a determination unit that determines whether the energization time period is a time period during which daytime power or nighttime power is supplied,
Storage means for storing a result of energizing time to the heating means during a night time zone, and when the flow rate sensor detects a predetermined hot water supply amount, energizing the heating means is started to raise the water temperature to the boiling temperature. In addition, when the elapsed time from the start of daytime power supply is counted and the elapsed time reaches a predetermined time, the power supply to the heating unit is stopped, and in the past night time zone stored in the storage unit. The predetermined hot water supply amount at which the energization to the heating means is started is changed in accordance with the actual energization time.

Also, the present invention provides a heating means to which daytime power or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature, and A flow sensor for detecting the amount of hot water supplied,
Determining means for determining whether the energizing time zone is a time zone in which daytime power or nighttime electric power is supplied, and storage means for storing a result of energizing time to the heating means in a nighttime zone; When the sensor detects the predetermined hot water supply amount, the power supply to the heating means is started to raise the water temperature to the boiling temperature, and the elapsed time from the start of daytime power supply is counted and the elapsed time reaches the predetermined time. In this case, the power supply to the heating means is stopped, and a predetermined time for stopping the power supply to the heating means is changed according to the power supply time in the past night time zone stored in the storage means. It was done.

[0013] Further, according to the present invention, the predetermined time for stopping the power supply to the heating means is changed according to the actual power supply time in the past night time zone stored in the storage means.

The present invention also provides a heating means to which daytime or nighttime electric power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature, and A flow sensor for detecting the amount of hot water supplied,
Determining means for determining whether the energizing time zone is a time zone in which daytime power or nighttime electric power is supplied, and storage means for storing a result of energizing time to the heating means in a nighttime zone; When the sensor detects the predetermined hot water supply amount, the power supply to the heating means is started to raise the water temperature to the boiling temperature, and the elapsed time from the start of daytime power supply is counted and the elapsed time reaches the predetermined time. In this case, the power supply to the heating means is stopped, and the heating means is supplied to the heating means in accordance with the result of the power supply time in the past night time zone stored in the storage means and the detected value of the supply water temperature detected by the temperature sensor. The predetermined hot water supply amount at which the energization is started is changed.

Further, the present invention provides a heating means to which daytime power or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature, and A flow sensor for detecting the amount of hot water supplied,
Determining means for determining whether the energizing time zone is a time zone in which daytime power or nighttime electric power is supplied, and storage means for storing a result of energizing time to the heating means in a nighttime zone; When the sensor detects the predetermined hot water supply amount, the power supply to the heating means is started to raise the water temperature to the boiling temperature, and the elapsed time from the start of daytime power supply is counted and the elapsed time reaches the predetermined time. In this case, the power supply to the heating means is stopped, and the heating means is supplied to the heating means in accordance with the result of the power supply time in the past night time zone stored in the storage means and the detected value of the supply water temperature detected by the temperature sensor. The predetermined time for stopping the current supply is changed.

In the present invention, the predetermined time for stopping the power supply to the heating means is also changed according to the actual power supply time in the past night time zone stored in the storage means and the supply water temperature. is there.

Further, according to the present invention, the boiling temperature in the daytime zone is set lower than the boiling temperature in the nighttime zone, and the boiling temperature is changed according to the detected value of the feedwater temperature detected by the temperature sensor. It was done.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, the present invention will be described based on the embodiments. FIG. 1 is a system configuration diagram of the electric water heater according to the first embodiment of the present invention, FIG. 2 is a block diagram of the electric water heater according to the first embodiment of the present invention, and FIG. It is an operation | movement flowchart of the electric water heater concerned. In FIGS.
6 to 8 to 11 have the same configuration as the conventional example shown in FIG. Reference numeral 7 denotes a flow sensor 7 for detecting the amount of hot water supplied from the hot water storage tank 2, and is provided in the middle of the hot water supply side pipe 4. The flow rate sensor 7 is capable of detecting the amount of hot water flowing out in an analog manner, and has a higher accuracy than that of detecting the amount of remaining hot water by using the temperature sensor 9. It does not depend on the mounting position of.

The control unit 10 detects the power supply time zone from the current time and the like, and determines whether the power supply time zone is daytime power or nighttime power. Storage means for storing the actual energization time.

Next, the boiling operation of the electric water heater according to Embodiment 1 of the present invention having the above configuration will be described with reference to the operation flowchart of FIG. First, when a power supply (not shown) of the water heater main body 1 is turned on, energization control is started (step S101), and the control unit 10 first detects a current time (step S102). When the current time is detected,
Next, it is determined whether it is a daytime period (from 7:00 to 11:00) or a nighttime period (from 11:00 to 7:00 the next morning) (step S103).

In the case of the night time zone (NO in step S103), energization of the heating element 8 is started (step S11).
2) When the temperature of the hot water is detected by the temperature sensor 9 and the hot water is heated to a predetermined boiling temperature T (90 ° C.) (YES in step S113), the power supply to the heating element 8 is stopped (step S113). S114), the actual energizing time of the heating element 8 during the night time period is stored in the storage means (step S114).
115), the energization control ends (step S116).
On the other hand, if it is during the daytime (Y in step S103)
ES), it is determined whether or not the actual energizing time of the heating element 8 in the past night time zone stored in the storage unit of the control unit 10 exceeds a predetermined time (6 hours in this example). (Step S104).

If the actual energizing time to the heating element 8 in the past night time period is 6 hours or more (YES in step 104), it can be determined that the amount of hot water to be used in the future is large, and the flow rate sensor 7 The amount of hot water supplied during the daytime (after 7:00 in the morning) is detected (step S105), and the predetermined amount (100
L) If no hot water is supplied (N in step S106)
O), it is determined that there is still a lot of hot water in the hot water storage tank 2, and no boiling is performed. On the other hand, if the hot water is supplied by a predetermined amount (100 L) or more (YES in step S106), it can be determined that the amount of hot water in hot water storage tank 2 is low, and power is supplied to eliminate the hot water and secure a predetermined amount of hot water. Start (step S109). Next, the elapsed time from the start of the daytime time zone is counted, and it is determined whether or not a predetermined time (for example, 10 hours) has elapsed, that is, whether or not 5:00 in the evening has passed (step S110). If the elapsed time has passed 10 hours or more (YE in step S110)
S), the energization is stopped (step S117). On the other hand, if the elapsed time has not elapsed for 10 hours or more (NO in step S110), it is determined whether the temperature of the hot water in hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C) (step S110). S111). When the temperature exceeds the boiling temperature T (90 ° C.), the energization is stopped (step S117), and the energization control is ended (step S116). If not exceeded (NO in step S111), the energization is continued.

Heating element 8 in the past past night time zone
If the actual energizing time for the battery is less than 6 hours (step S1
04 (NO), it is determined that the amount of hot water to be used in the future is small, and the flow sensor 7 detects the amount of hot water during the daytime (after 7:00 in the morning) (step S107). Here, since it is determined that the amount to be used in the future is small, the predetermined hot water supply amount at the start of boiling is set to 1
It has been changed from 00L to 150L. Predetermined amount (150
L) If no hot water is supplied (N in step S108)
O), it can be determined that there is a lot of hot water in the hot water storage tank 2, and no boiling is performed. On the other hand, if the hot water is supplied by a predetermined amount (150 L) or more (YES in step S108), hot water storage tank 2
It can be determined that the amount of hot water in the inside is low, and energization is started in order to eliminate running out of water and secure a predetermined amount of hot water (step S109). The subsequent operation (steps S109 to S116) is exactly the same as the case where the actual energizing time to the heating element 8 is 6 hours or more.

That is, in the present embodiment, 1 means that energization in the daytime period is limited to within a predetermined time (10 hours) from the start of power supply in the daytime period, and the power supply to the heating element 8 in the past nighttime period. The amount of hot water to be used in the future is determined in accordance with the actual energizing time, and if the actual energizing time in the past night time period is small, the predetermined hot water supply amount at the start of boiling is increased to the heating element 8 in the daytime period. Is controlled so as to reduce the energizing time.
Therefore, the amount of power used during the daytime hours when the electricity bill is high is limited, and the electricity bill can be reduced while running out of hot water.

Embodiment 2 FIG. 4 is an operation flowchart of an electric water heater according to Embodiment 2 of the present invention. Note that the basic configuration of the electric water heater is the same as that of the first embodiment, and a description thereof will be omitted. Further, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the boiling operation of the electric water heater according to Embodiment 2 of the present invention will be described with reference to FIGS. The operation in the night time zone is the same as that of the first embodiment, and only the parts different from the first embodiment will be described below. The difference from the first embodiment is that a predetermined amount of hot water to be supplied to the heating element 8 in the daytime period is not changed according to the actual powering time of the heating element 8 in the past nighttime period. That is, the length of the predetermined time until the power supply to the power supply is stopped is changed. In the operation flowchart of FIG. 4, if it is a daytime zone (step S10
3), it is determined whether or not the actual energizing time of the heating element 8 in the past night time zone stored in the storage unit of the control unit 10 exceeds a predetermined time (6 hours in this example). (Step S104).

If the actual energizing time to the heating element 8 in the past night time period is less than or equal to 6 hours (NO in step S104), it is determined that the amount of hot water to be used in the future is small, and the flow rate sensor 7 detects the daytime time period ( The hot water supply amount after 7:00 in the morning is detected (step S107). Here, since it is determined that the amount used in the future is small, the boiling limit time is set to 5 o'clock in the evening (10 o'clock).
Hours) to 12:00 noon (5 hours) to reduce the energization time. If the hot water is not supplied more than the predetermined amount (100 L) (NO in step S108), it can be determined that there is a lot of hot water in the hot water storage tank 2, and boiling is not performed. On the other hand, if the hot water is supplied by a predetermined amount (100 L) or more (YES in step S108), it can be determined that the amount of hot water in hot water storage tank 2 is low, and power is supplied to eliminate the hot water and secure a predetermined amount of hot water. The process starts (step S118).
Next, the elapsed time from the start of the daytime time zone is counted, and it is determined whether or not a predetermined time (5 hours) has elapsed, that is, whether or not it is after 12:00 noon (step S119). If the elapsed time has elapsed for 5 hours or more (YES in step S119), the power supply is stopped (step S117). On the other hand, when the elapsed time has not elapsed for 5 hours or more (NO in step S119), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S120). ). If it exceeds, the energization is stopped to end the boiling control (step S117), and the energization control is ended (step S1).
16). If not exceeded (NO in step S120), energization is continued.

That is, in the second embodiment, energization during the daytime is limited to within a predetermined time (10 hours) from the start of power supply during the daytime, and the heating element 8 in the past nighttime is used.
Judging the amount of hot water to be used in the future according to the actual energizing time
In the past, when the actual energizing time of the heating element 8 in the nighttime period is small, the energizing time of the heating element 8 in the daytime period is changed to a short energizing time (5 hours) to further limit. Therefore, the amount of electricity in the daytime hours when the electricity bill is high is limited, and the electricity bill can be further reduced while preventing running out of hot water.

Third Embodiment FIG. 5 is an operation flowchart of an electric water heater according to a third embodiment of the present invention. Note that the basic configuration of the electric water heater is the same as that of the first embodiment, and a description thereof will be omitted. Further, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation of controlling the boiling of the electric water heater according to Embodiment 3 of the present invention will be described with reference to FIGS. 1, 2 and 5. The operation in the night time zone is the same as that of the first embodiment, and only the parts different from the first embodiment will be described below. The difference from the first embodiment is that a predetermined amount of hot water to start energizing the heating element 8 and a predetermined time to stop energizing the heating element 8 in the daytime period in accordance with the actual energizing time to the heating element 8 in the past nighttime period. Has changed.

In the operation flowchart of FIG. 5, if the actual energizing time to the heating element 8 in the past night time period is 6 hours or less (NO in step S104), it is determined that the amount of hot water to be used in the future is small, and the flow rate is determined. The amount of hot water supplied during the daytime (after 7:00 in the morning) is detected by the sensor 7 (step S10).
7). Here, since it is determined that the amount of water to be used in the future is small, the predetermined hot water supply amount at the start of boiling is changed from 100 L to 150 L, and the boiling limit time is further reduced from 5:00 (10 hours) in the evening to 12:00 noon. (5 hours) to reduce the energization time. If the hot water is not supplied more than the predetermined amount (150 L) (NO in step S108), it can be determined that there is a lot of hot water in the hot water storage tank 2, and boiling is not performed. on the other hand,
When a predetermined amount (150 L) or more is supplied (step S1
08 (YES), it can be determined that the amount of hot water in the hot water storage tank 2 is low, and energization is started in order to eliminate running out of hot water and secure a predetermined amount of hot water (step S118). Next, the elapsed time from the start of the daytime zone is counted, and it is determined whether or not a predetermined time (5 hours) has elapsed, that is, whether or not it is after 12:00 noon (step S119). If the elapsed time has elapsed for 5 hours or more (YES in step S119), the power supply is stopped (step S117). On the other hand, if the elapsed time has not elapsed for 5 hours or more (NO in step S119), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C) (step S119). S120). If it has exceeded (YES in step S120), the energization is stopped (step S117), and the energization control ends (step S116). If not exceeded (step S12
(NO of 0) energization is continued.

That is, in the third embodiment, energization in the daytime period is performed for a predetermined time (10 hours) from the start of power supply in the daytime period.
The amount of hot water to be used in the future is determined based on the actual time of energizing the heating element 8 in the past night time zone, and the actual energizing time of the heating element 8 in the past night time period is small. Is controlled so that the predetermined hot water supply amount at the start of boiling is increased so that the energization time to the heating element 8 during the daytime is reduced, and the energization time to the heating element 8 during the daytime is reduced during the energization time ( 5 hours). Therefore, the amount of power in daytime hours when the electricity bill is higher than in the first and second embodiments is limited, and the electricity bill can be further reduced while preventing running out of hot water.

Fourth Embodiment FIG. 6 is an operation flowchart of an electric water heater according to a fourth embodiment of the present invention. Note that the basic configuration of the electric water heater is the same as that of the first embodiment, and a description thereof will be omitted. Further, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation of the electric water heater according to Embodiment 4 of the present invention will be described with reference to FIGS. 1, 2 and 6. The operation in the night time zone is the same as that of the first embodiment, and only the parts different from the first embodiment will be described below.
The difference from the first to third embodiments is that not only the actual energizing time to the heating element 8 in the past night time zone, but also the predetermined hot water supply amount at the start of boiling in the daytime zone is changed in consideration of the feedwater temperature. It is that you are.

In the operation flowchart of FIG. 6, if it is the daytime period (YES in step S203), the actual energization time to the heating element 8 in the past nighttime period stored in the storage means of the control unit 10 is determined. It is determined whether or not a predetermined time has passed (step S204).

If the actual energizing time of the heating element 8 in the past night time period is 6 hours or more (YES in step S204), it is determined that the amount of hot water to be used in the future is large, and the temperature of the water supply water is detected by the temperature sensor 9. It is detected (step S205). When the supply water temperature is equal to or lower than the predetermined temperature (15 ° C.) (step S2)
(YES in 06), it is determined that it is winter, when the amount of hot water to be used in the future is large, and when the temperature of the supplied water is equal to or higher than a predetermined value, it is determined to be summer, when the amount of hot water to be used is small in the future. Next, the flow rate sensor 7 detects the hot water supply amount during the daytime (after 7:00 in the morning) (step S20).
7) If the hot water has not yet been supplied to the predetermined amount (100 L) or more (NO in step S208), the process returns to the detection of the current time in step S202, and boiling is not performed. On the other hand, if the hot water is supplied at a predetermined amount (100 L) or more (YES in step S208), it can be determined that the amount of hot water in hot water storage tank 2 is low, and power is supplied to eliminate the hot water and secure a predetermined amount of hot water. It starts (step S215). Next, the elapsed time from the start of the daytime time zone is counted, and it is determined whether or not a predetermined time (for example, 10 hours) has elapsed, that is, whether or not 5:00 in the evening has passed (step S216). If the elapsed time has passed 10 hours or more (YES in step S216), the energization is stopped (step S223), and the energization control is ended (step S22).
2). On the other hand, if the elapsed time has not elapsed for 10 hours or more (NO in step S216), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S217). ). If it has exceeded (YES in step S217), the energization is stopped (step S223), and the energization control ends (step S22).
2). If not exceeded (NO in step S217), energization is continued.

If the actual energizing time of the heating element 8 in the past night time period is less than 6 hours (NO in step S204), it is determined that the amount of hot water to be used in the future is small, and the temperature sensor 9 detects the temperature of the supplied water. (Step S209). When the feedwater temperature is equal to or lower than the predetermined temperature (15 ° C.) (step S21)
0 (YES), the flow sensor 7 detects the hot water supply amount during the daytime (after 7:00 in the morning) (step S211). Here, since it is determined that the future consumption is small, the predetermined hot water supply amount at the start of boiling is changed from 100 L to 125 L. If hot water is not supplied more than the predetermined amount (125 L) (NO in step S212), boiling is not performed. On the other hand, when hot water is supplied at a predetermined amount (125 L) or more (step S21).
(YES in No. 2), it can be determined that the amount of hot water in the hot water storage tank 2 is low, and energization is started in order to eliminate hot water and secure a predetermined amount of hot water (step S215). The subsequent operation is exactly the same as the case where the actual energizing time is 6 hours or more.

If the supply water temperature is equal to or higher than the predetermined temperature (15 ° C.) (NO in step S210), the flow rate sensor 7 detects the amount of hot water supplied during the daytime (after 7:00 in the morning) (step S213). Here, since it is determined that the future usage is even smaller, the predetermined hot water supply at the start of boiling is changed from 100 L to 150 L. When hot water is not supplied more than the predetermined amount (150 L) (NO in step S214), boiling is not performed. On the other hand, when it is determined that the hot water has been supplied by the predetermined amount (150 L) or more (YES in step S214), it can be determined that the amount of hot water in hot water storage tank 2 is low, and in order to eliminate the hot water and secure the predetermined amount of hot water. The energization is started (step S215). The subsequent operation is exactly the same as the case where the actual energizing time to the heating element 8 in the past nighttime period is 6 hours or more.

That is, in the fourth embodiment, energization in the daytime period is performed for a predetermined time (10 hours) from the start of power supply in the daytime period.
The amount of hot water to be used in the past is determined in accordance with the actual power supply time to the heating element 8 in the past night time zone and the detected value of the supply water temperature. When the actual energizing time is short and the temperature of the feed water is high, in other words, in summer, the amount of hot water to be boiled is increased so that the energizing time to the heating element 8 during the daytime is reduced. Therefore, the amount of power in the daytime period when the electricity bill is higher than in the case of Embodiment 1 is limited, and the electricity bill can be further reduced while reliably preventing running out of hot water.

Embodiment 5 FIG. 7 is an operation flowchart of an electric water heater according to Embodiment 5 of the present invention. Note that the basic configuration of the electric water heater is the same as that of the first embodiment, and a description thereof will be omitted. Further, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation of controlling the boiling of the electric water heater according to the fifth embodiment of the present invention will be described with reference to FIGS. The operation in the night time zone is the same as that of the fourth embodiment, and the parts different from the fourth embodiment will be described below. The difference from the fourth embodiment is that the predetermined time during which power to the heating element 8 is stopped during the daytime is also changed according to the actual powering time of the heating element 8 in the past nighttime and the supply water temperature. It is.

In the operation flowchart of FIG. 7, if the actual energizing time to the heating element 8 in the past night time period is 6 hours or less (NO in step S204), it is determined that the amount of hot water to be used in the future is small, and the temperature is determined. The temperature of the water supply is detected by the sensor 9 (step S209). When the feedwater temperature is equal to or lower than the predetermined temperature (15 ° C.) (YES in step S210),
The flow rate sensor 7 detects the amount of hot water supply during the daytime (after 7:00 in the morning) (step S211). Here, since it is determined that the amount of use in the future will be small, the boiling limit time is changed from 5:00 (10 hours) in the evening to 2:00 (7 hours) in the afternoon, and the energization time is reduced. When hot water is not supplied more than the predetermined amount (100 L) (NO in step S212), boiling is not performed. On the other hand, if the hot water is supplied at a predetermined amount (100 L) or more (YES in step S212), it can be determined that the amount of hot water in hot water storage tank 2 is low, and power is supplied to eliminate the hot water and secure a predetermined amount of hot water. Start (Step S
224). Next, the elapsed time from the start of the daytime time zone is counted, and it is determined whether or not a predetermined time (7 hours) has elapsed, that is, whether or not 2:00 pm has passed (step S225). If the elapsed time has elapsed for 7 hours or more (YES in step S225), the power supply is stopped (step S223). On the other hand, if the elapsed time has not elapsed for 7 hours or more (NO in step S225), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S226). ). If it exceeds, the energization is stopped to end the boiling control (step S223), and the energization control is ended (step S222). If not exceeded (NO in step S226), energization is continued.

When the supply water temperature is equal to or higher than the predetermined temperature (15 ° C.) (NO in step S210), the flow sensor 7 detects the amount of hot water supplied during the daytime (after 7:00 in the morning) (step S213). Here, since it can be determined that the future usage amount is small, the boiling limit time is changed from 5:00 (10 hours) in the evening to 12:00 (5 hours) at noon, and the energizing time is further reduced. When hot water is not supplied more than the predetermined amount (100 L) (NO in step S214), boiling is not performed. On the other hand, if it is determined that the hot water has been supplied by the predetermined amount (100 L) or more (YES in step S214), it can be determined that the amount of hot water in hot water storage tank 2 is low, and in order to avoid running out of hot water and secure a predetermined amount of hot water. , Start energization (step S
227). Next, the elapsed time from the start of the daytime time zone is counted, and it is determined whether or not a predetermined time (5 hours) has elapsed, that is, whether or not it is after 12:00 noon (step S228). If the elapsed time has elapsed for 5 hours or more (YES in step S228), the power supply is stopped (step S223). On the other hand, when the elapsed time has not elapsed for 5 hours or more (NO in step S228), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S229). ). If it exceeds, the energization is stopped to end the boiling control (step S223), and the energization control is ended (step S222). If not exceeded (NO in step S229), energization is continued.

That is, in the fifth embodiment, energization in the daytime period is performed for a predetermined time (10 hours) from the start of power supply in the daytime period.
The amount of hot water to be used in the past is determined in accordance with the actual power supply time to the heating element 8 in the past night time zone and the detected value of the supply water temperature. In the case where the actual energization time is small and the temperature of the water supply water is high, in other words, in summer, the energization time to the heating element 8 during the daytime is set to a short energization time (5 hours) to further limit. Therefore, the amount of power in the daytime period when the electricity cost is higher than in the case of Embodiment 2 is limited, and the electricity cost can be further reduced while reliably preventing running out of hot water.

Embodiment 6 FIG. 8 is an operation flowchart of an electric water heater according to Embodiment 6 of the present invention. Note that the basic configuration of the electric water heater is the same as that of the first embodiment, and a description thereof will be omitted. Further, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation of controlling the boiling of the electric water heater according to Embodiment 6 of the present invention will be described with reference to FIGS. 1, 2 and 8. The operation in the night time zone is the same as that of the fifth embodiment, and the different points from the fifth embodiment will be described below. The difference from the fifth embodiment is that the boiling temperature in the daytime is changed in accordance with the past hot water supply results and the detected value of the feed water temperature.

In the operation flow chart of FIG. 8, when the actual energizing time to the heating element 8 in the past night time period is 6 hours or more (YES in step S204), and when the water supply water temperature is lower than the predetermined temperature (15 ° C.). (Step S20
6; YES), when the predetermined amount (100 L) or more is supplied (YES in step S208), the predetermined time for stopping the energization of the heating element is set to 10 hours (step S216), and the boiling temperature during the daytime is set to 10 hours. T1 (80 ° C.) (step S217). If the actual energizing time to the heating element 8 in the past nighttime period is less than or equal to 6 hours (NO in step S204), the supply water temperature becomes the predetermined temperature (15
° C) or less (YES in step S210), and when a predetermined amount (125L) or more is supplied (step S212).
YES), the predetermined time for stopping the energization of the heating element 8 is set to 7
(Step S225), and the boiling temperature during the daytime is set to T2 (70 ° C.) (step S22).
6). Further, in the case where the actual energizing time to the heating element 8 in the past night time period is 6 hours or less (step S204).
NO), when the supply water temperature is equal to or higher than the predetermined temperature (15 ° C.) (NO in step S210), and when the predetermined amount (150L) is supplied (YES in step S214), the power supply to the heating element 8 is stopped. The predetermined time is set to 5 hours (step S228), and the boiling temperature during the daytime is set to T3 (50
° C) (step S229).

That is, in the sixth embodiment, the energization in the daytime period is performed for a predetermined time (10 hours) from the start of the power supply in the daytime period.
The amount of hot water to be used in the past is determined in accordance with the actual power supply time to the heating element 8 in the past night time zone and the detected value of the supply water temperature. If the actual energization time is low and the feedwater temperature is high,
In other words, in the case of summer, the control is performed so that the predetermined hot water supply amount at the start of boiling is increased so that the energization time to the heating element 8 during the daytime is reduced, and the energization time to the heating element 8 during the daytime is reduced. Is limited to a short energizing time (5 hours), and the boiling temperatures T1, T2, and T3 in the daytime period are lower than the boiling temperature T (90 ° C.) in the nighttime period (T1 = 80).
° C, T2 = 70 ° C, T3 = 50 ° C). Therefore, the amount of electricity in the daytime hours when the electricity bill is high is limited, and the electricity bill can be further reduced while reliably preventing running out of hot water.

In the first to sixth embodiments, the heating element 8 is used as a heating device for raising the temperature of the hot water storage tank 2. However, the present invention is not limited to this. A vessel may be used. Embodiment 1
In ~ 6, only one temperature sensor 6 for measuring the boiling temperature, the supply water temperature, and the temperature of the temperature sensor mounting portion is provided,
The present invention is not limited to this, and each temperature can be measured using a separate sensor.

In the first to sixth embodiments, the flow rate sensor 7 is provided in the middle of the hot water supply pipe 4 to directly detect the hot water supply amount. However, the present invention is not limited to this. A method of providing a flow sensor 7 in the middle of the side pipe 3 and indirectly detecting the hot water supply amount from the water supply amount may be employed. Further, the data of the actual energizing time to the heating element 8 in the past night time zone stored in the storage unit of the control unit 10 was described in the energizing time actual in the past one day.
Week), the average energization time in the nighttime zone may be used. It goes without saying that the data of the past energization time results stored in the storage means is automatically updated.

[0051]

As is apparent from the above description, in the electric water heater according to the present invention, energization in the daytime period is limited to within a predetermined time from the start of power supply in the daytime period. When the actual time of energization to the heating element is short, the specified hot water supply at the start of boiling is increased so that the energization time to the heating element during the daytime is controlled to be short. It is possible to provide an electric water heater that restricts electricity supply to unnecessary heating elements in the belt as much as possible, keeps electricity costs inexpensive, and achieves prevention of running out of hot water, which is the original purpose of the electric water heater.

In the electric water heater according to the present invention, energization in the daytime period is limited to within a predetermined time from the start of power supply in the daytime period. When the power is low, the power supply to the heating elements in the daytime is reduced to a shorter time, and the power supply to unnecessary heating elements during the daytime when electricity costs are high is limited as much as possible. It is possible to provide an electric water heater that can reduce the cost and achieve prevention of running out of hot water, which is the original purpose of the electric water heater.

In the electric water heater according to the present invention, energization in the daytime period is limited to a predetermined time from the start of power supply in the daytime period. When the amount is small, the predetermined hot water supply at the start of boiling is increased to control the energizing time to the heating element during the daytime to be reduced, and the energizing time to the heating element during the daytime is reduced to the energizing time. Because of the restriction, the power supply to unnecessary heating elements during the daytime when the electricity bill is high is limited as much as possible to keep the electricity bill low, and to prevent the running out of hot water which is the purpose of the original electric water heater. An electric water heater can be provided.

In the electric water heater according to the present invention, energization in the daytime period is limited to within a predetermined time from the start of power supply in the daytime period. Low and the feedwater temperature is high,
Since the power supply to the heating element during the daytime is controlled to be short by increasing the predetermined hot water supply amount at the start of boiling, it is possible to energize unnecessary heating elements during the daytime when electricity costs are high. It is possible to provide an electric water heater that restricts electricity costs at a low price and achieves prevention of running out of hot water, which is the original purpose of the electric water heater.

Further, in the electric water heater according to the present invention, energization in the daytime period is limited to within a predetermined time from the start of power supply in the daytime period. When the supply water temperature is low and the supply water temperature is high, the power supply time to the heating elements during the daytime is reduced to a shorter time, and the power supply to unnecessary heating elements during the daytime when electricity costs are high is further reduced. The electric water heater can be provided that limits the cost of electricity by keeping the cost as low as possible, and also achieves the prevention of running out of hot water, which is the original purpose of the electric water heater.

In the electric water heater according to the present invention, energization in the daytime period is limited to a predetermined time from the start of power supply in the daytime period. When the water supply temperature is low and the supply water temperature is high, the predetermined hot water supply amount at the start of boiling is increased so that the power supply time to the heating element 5 during the daytime is controlled to be short, and the power supply to the heating element during the daytime is controlled. Since the time is limited to a short energization time, it is the original purpose of an electric water heater, in which electricity supply to unnecessary heating elements during the daytime when electricity costs are high is limited as much as possible to keep electricity costs low. An electric water heater that achieves prevention of running out of hot water can be provided.

Further, in the electric water heater according to the present invention, since the boiling temperature in the daytime period is lower than the boiling temperature in the nighttime period, and the boiling temperature is changed in accordance with the temperature of the feed water, the electric water heater is used. It is possible to provide an electric water heater that limits unnecessary power supply to unnecessary heating elements during a daytime period when the cost is high, suppresses electricity costs inexpensively, and achieves prevention of running out of hot water which is the original purpose of the electric water heater.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electric water heater according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram of the electric water heater according to Embodiment 1 of the present invention.

FIG. 3 is an operation flowchart of the electric water heater according to Embodiment 1 of the present invention.

FIG. 4 is an operation flowchart of an electric water heater according to Embodiment 2 of the present invention.

FIG. 5 is an operation flowchart of an electric water heater according to Embodiment 3 of the present invention.

FIG. 6 is an operation flowchart of an electric water heater according to Embodiment 4 of the present invention.

FIG. 7 is an operation flowchart of an electric water heater according to Embodiment 5 of the present invention.

FIG. 8 is an operation flowchart of an electric water heater according to Embodiment 6 of the present invention.

FIG. 9 is a configuration diagram of a conventional electric water heater.

FIG. 10 is an operation flowchart of a conventional electric water heater.

[Explanation of symbols]

1 water heater body, 2 hot water storage tank, 3 water supply side piping, 4
Hot water supply piping, 7 flow rate sensor, 8 heating element, 9 temperature sensor, 10 control unit, 11 operation unit.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaaki Furuuchi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Kensuke Matsuo 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. F-term (reference) 3L025 AB21

Claims (7)

[Claims] 1. A heating means to which daytime or nighttime electric power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature, and an external hot water supply amount. A flow rate sensor to be detected, a determining unit for determining whether the energizing time period is a time period during which the daytime power or the nighttime electric power is supplied, and a storage for storing the actual energizing time to the heating unit in the nighttime period. Means, when the flow rate sensor detects a predetermined hot water supply amount, starts energization of the heating means to raise the water temperature to the boiling temperature, and counts an elapsed time from the start of daytime power supply to measure the temperature. When the elapsed time reaches a predetermined time, the power supply to the heating means is stopped, and the power supply to the heating means is started in accordance with the actual power supply time in the past night time zone stored in the storage means. An electric water heater characterized by changing a predetermined amount of hot water to be supplied. 2. A heating means to which daytime or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a feedwater temperature, and an external hot water supply amount. A flow rate sensor to be detected, a determining unit for determining whether the energizing time period is a time period in which daytime electric power or nighttime electric power is supplied, and a storing unit for storing a result of energizing time to the heating unit in a nighttime time period With
When the flow rate sensor detects a predetermined hot water supply amount, the power supply to the heating means is started to raise the water temperature to the boiling temperature, and the elapsed time from the start of the daytime power supply is counted, and the elapsed time is counted as the predetermined time. When the power reaches the heating means, the power supply to the heating means is stopped, and the predetermined time for stopping the power supply to the heating means is changed in accordance with the power supply time result in the past night time zone stored in the storage means. An electric water heater characterized in that: 3. The electric hot water according to claim 1, wherein a predetermined time for stopping the power supply to said heating means is changed in accordance with a power supply time record in the past night time zone stored in said storage means. vessel. 4. A heating means to which daytime electric power or nighttime electric power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature, and an external hot water supply amount. A flow rate sensor to be detected, a determining unit for determining whether the energizing time period is a time period in which daytime electric power or nighttime electric power is supplied, and a storing unit for storing a result of energizing time to the heating unit in a nighttime time period With
When the flow rate sensor detects a predetermined hot water supply amount, the power supply to the heating means is started to raise the water temperature to the boiling temperature, and the elapsed time from the start of the daytime power supply is counted, and the elapsed time is counted as the predetermined time. Is reached, the power supply to the heating means is stopped, and the heating is performed according to the actual power supply time in the past night time zone stored in the storage means and the detected value of the feed water temperature detected by the temperature sensor. An electric water heater characterized in that a predetermined hot water supply amount for starting energization of the means is changed. 5. A heating means to which daytime power or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a temperature of feed water, and an amount of hot water supplied to the outside. A flow rate sensor to be detected, a determining unit for determining whether the energizing time period is a time period in which daytime electric power or nighttime electric power is supplied, and a storing unit for storing a result of energizing time to the heating unit in a nighttime time period With
When the flow rate sensor detects a predetermined hot water supply amount, the power supply to the heating means is started to raise the water temperature to the boiling temperature, and the elapsed time from the start of the daytime power supply is counted, and the elapsed time is counted as the predetermined time. Is reached, the power supply to the heating means is stopped, and the heating is performed according to the actual power supply time in the past night time zone stored in the storage means and the detected value of the feed water temperature detected by the temperature sensor. An electric water heater characterized in that a predetermined time during which the power supply to the means is stopped is changed. 6. A predetermined time period for stopping the power supply to the heating means according to the power supply time record and the water supply water temperature in the past night time zone stored in the storage means. Electric water heater. 7. The method according to claim 1, wherein the boiling temperature in the daytime zone is set lower than the boiling temperature in the nighttime zone, and is changed according to a detected value of the feedwater temperature detected by the temperature sensor. Item 7. An electric water heater according to items 1 to 6.