JPH02143052A - Control device for hot water feeder - Google Patents

Abstract

PURPOSE:To enable a large amount of hot water to be used even in case of a small-sized hot water feeder by a method wherein at mid-night, a specified preference time zone for boiling up hot water is provided and at the same time even at a time zone except the preference time zone, a boiling can be performed again under an action of a thermostat every time the hot water is used within a range of predetermined times. CONSTITUTION:An electrical hot water feeder is energized for eight hours at mid-night of a preference time zone set by a timer device 14 and then the hot water is boiled up to a predetermined temperature within the specified time. If the number of counts of the counter is set by the number of times setting means 17 until 10 hours elapse, an additional boiling is carried out just after use until the specified times come, resulting in that at the time when a hot water feeding is started for a bath tub in the evening, all amount of hot water in the tank are already boiled up to a predetermined hot water temperature and it becomes possible to provide the same amount of hot water as that of the prior art even in case of the hot water feeder having a small capacity and then its installation at a narrow space in a home can be carried out.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a control device for a water heater.

Conventional technology Conventionally, electric water heaters that use late-night power have a timer installed in the power supply circuit to effectively utilize surplus power during the night, so that the power is turned on at a preset time in the middle of the night. The water was boiled by boiling water.

Problems to be Solved by the Invention However, in recent years, there have been an increasing number of cases in which electric water heaters are connected to a normal daytime power circuit instead of a specific late-night power supply circuit.

In this case, if power was supplied during the evening hours when the largest amount of hot water was used, the heater of the water heater would be energized every time a small amount of hot water was used, resulting in very poor usage efficiency of the water heater. In addition, conventional water heaters that use electricity late at night have the disadvantage that when hot water is used from morning to evening, the amount of hot water becomes insufficient in the evening when the largest amount of hot water is used.

The present invention solves the above problems and provides a water heater control device that can supply a sufficient amount of hot water.

In order to solve the above-mentioned problems, the water heater of the present invention is provided with a 24-hour timer device that turns on electricity only during a certain priority time period from a preset time, and at the same time, it should turn on electricity at times other than the above-mentioned priority time period. After setting the number of times, when hot water is used, the heater's thermostat is activated to start energizing the heater, and when the set water temperature is reached again and the heater energization stops, the current detection means detects and subtracts each time. It is equipped with a counting means.

Effect With the above configuration, even if the hot water heater is connected to the power circuit during the daytime, it avoids the evening time when the largest amount of hot water is used. At the same time as setting a priority time period, the thermostat can re-boil hot water each time you use it within a preset number of times outside of the above time period, making it possible to use a large amount of hot water even with a small water heater. become.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 2 shows a configuration diagram of a water heater using the control device of the present invention. In Figure 2, 7 is the tank of the water heater, ■ is the hot water inlet located at the top of tank 7, 2 is the water inlet located at the bottom of tank 7, and 3 is also located at the bottom of tank 7. 4 is a heater which is a heating means, 5 is a tank 7
6 is a control box.

FIG. 7 is a diagram illustrating a conventional power supply circuit used in the water heater. Electric power distributed to each home from the power supply line 19 is supplied via a watt-hour meter 20 as a power source for general appliances 21. On the other hand, the late-night power system is supplied to the electric water heater 24 via a late-night power meter 22 that is separate from the power supply system for the general appliance 21, and a timer 23 that sets the late-night power supply time period. Therefore, as shown in the graph of FIG. 8, the time during which electricity is applied to the electric water heater 24 of FIG. However, it is necessary to prepare a water heater with a tank capacity sufficient to match the amount of hot water for morning hot water supply (h in the graph), midday hot water supply (i) in the graph, and evening bathing (j in the graph). was there. In the graph of FIG. 8, there may be a case where the hot water is out of water at the time of rising hot water indicated by graph k, as shown in 1. FIG. 3 is a diagram illustrating a case where the water heater is used together with the control device of the present invention in the same power supply system as a general appliance. Electric power distributed to each household from the power supply line 25 is supplied as a power source for general appliances 27 via a power meter 26. On the other hand, the electric water heater 29 and the control device 28 are installed in the same power supply system as the general appliance 27. However, the voltage supplied to each system shall be branched on the circuit according to the equipment.

FIG. 1 shows a block diagram of an embodiment of a control device according to the invention. In the figure, wiring is wired from an AC power supply terminal 8 through a relay contact 11 to an output terminal 9, and the water heater shown in FIG. 1 is connected to the output terminal 9 for use.

FIG. 6 shows a flow diagram of an embodiment of the control device of the present invention. Next, the operation will be explained according to the lowercase letters attached to the flowchart. (a) When the ON time of the priority time zone set in the late night time zone set in the timer device 14 of FIG. Power is supplied to the output terminal 9. Next, the set priority time period has passed and (c) OF
At the FVf time (Yes), the relay 15 is deenergized (d) and the contact 11 of the relay is turned OFF, stopping the power supply to the output terminal 9. (e) Until 10 hours have passed (No), (f) If there is a remaining number of times on the counter 16 set by the number setting means 17 (Ye)
s) The relay 15 is energized intermittently, and then (h) the current detection means 13 detects that the current flowing has stopped, that is, the water heater has reached a predetermined water temperature and the current to the heater has stopped. If detected (Yes), (i) the electric water heater 29 of FIG. is heated to a predetermined temperature, and at that time, if the set number of times of the counting means 16 is set to, for example, r2j, there is a number of times left of the counting means 16, so the relay continues to be turned on as shown in the flow diagram of FIG. When hot water is supplied in the morning as indicated by b in the graph, when the temperature of the water in the tank drops, the thermostat energizes the heater again and boils the water. After that, when the water reaches a predetermined temperature, the current detection circuit 13 increments the number of times counted by the counting means 16 by "-1", but since there is still a number of times left, the relay continues to be turned on. Next, hot water is supplied during the daytime as indicated by C in the graph, and when the temperature of the water in the tank drops, the water is energized again to the heater and boiled. After that, when the water is heated to a predetermined temperature, the current detection circuit 13 increments the number of times counted by the counting means 16 by "-1", and the remaining number of times becomes [0], so the relay is turned off. In this way, after the priority time period ends, the number of times is decreased by one according to the number of times hot water is used, and the number returns to the original value.

Next (f) Counting means 160 times, when there are no more losses (N
o) The relay 15 is de-energized and the relay contact 11 is turned off (j) The power supply to the output terminal 9 is stopped. Similarly, after the priority time period has elapsed (e) If another 10 hours have elapsed (Yes), (k) the relay 15 is de-energized, the relay contact 11 is turned OFF, and power is supplied to the output terminal 9. will be stopped. In that case, as shown in the flowchart, even if there is a remaining number of times in the counting means 16, priority is given to turning off the relay after 10 hours have elapsed.

FIG. 5 shows that during the operation of the timer device 14 explained in FIG. 6, control signals corresponding to the ON time and OFF time of the priority time zone set in the late night time zone are input from the control terminal 18, and the present invention is implemented. The operation is almost the same as that described in FIG. 6, except that the timer device 14 does not need a means for setting the priority time period because the control device is operated, so a detailed explanation is omitted. do.

With the above configuration, if you set the number of counters as shown in the graph of Figure 4, reheating will be performed immediately after use until that number of times, so water supply for evening bathing as indicated by d in the graph will start. At this point, the entire amount of hot water in the tank has been boiled to the specified temperature, so the graph in Figure 8 shows 1.
As shown in Figure 4, there are cases where the hot water has run out at the point of rising hot water indicated by k in the graph, but there is no need to worry about running out of hot water even if you use rising hot water as shown in e in Figure 4. .

It should be noted that an electric water heater incorporating the control device of the present invention also exhibits similar effects through similar operations.

Effects of the Invention As described above, according to the present invention, even when an electric water heater is connected to a power circuit during the day, it is possible to set a certain priority time period in the middle of the night to boil water. At the same time, even after the priority time period has elapsed, boiling can be performed a set number of times within a certain period of time, and by providing a current detection means to detect the energization of the heater, small-capacity heating using daytime electricity can be performed. The water heater can now supply the same amount of hot water as before, allowing it to be installed in a smaller space at home, and at the same time has the great effect of preferentially using surplus electricity at night when supplying electricity. It is something that causes

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the water heater control device of the present invention, Fig. 2 is a block diagram of a water heater using the same control device, and Fig. 3 shows the water heater together with the control device for general appliances. Fig. 4 is a graph showing the hot water supply status of the water heater and the amount of hot water in the tank by the same control device, and Fig. 5 is a diagram explaining the operation of the same control device. Flowchart, FIG. 6 is a flowchart explaining the operation of the control device for another water heater of the present invention, FIG. 7 is an explanatory diagram explaining the conventional power supply circuit used in the water heater,
The figure is a graph showing the hot water supply status and the amount of hot water in the tank of a conventional late-night electric water heater. l...Hot water inlet, 2...Water inlet, 3...
...Drain port, 4...Heating device, 7...
...Tank, 10...Current detection means, 14...
. . . Timer device, 16 . . . Counting means, 18 . . . Control terminal. Name of agent: Patent attorney Shigetaka Awano (1 person)

Claims (2)

[Claims] (1) Equipped with a heater as a heating means for heating the water in the tank, which has a hot water inlet at the top and a water inlet and a drain at the bottom respectively, and a current detection means to detect the supply of electricity to the heater, and has a preset A water heater control device comprising: a timer device that preferentially energizes a specific time period starting from time; and a count means that sets the number of times the energization should be applied during times other than the priority time period. (2) The water heater control device according to claim (1), which is provided with a control terminal for an external signal that sets the start of a specific time period instead of a timer that can set the time in advance.