JP2754393B2 - Electric water heater boiling control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control device for an electric water heater using midnight power.

[Prior Art] FIG. 5 is a configuration diagram of a conventional hot water storage type electric water heater using midnight electric power, and FIG. 6 is an electric circuit diagram thereof, wherein 1 is a hot water storage tank, 2 is a heating element, and 3 is a heating element. An automatic temperature controller for controlling the boiling temperature, 4 is a hot water supply pipe, 5 is a faucet, 6 is a water supply pipe, 7 is a power supply, and 8 is a time switch for setting the supply time of midnight power.

In the figure, the capacity of the heating element 2 is set such that water of about 8 ° C. rises to a predetermined temperature of 85 ° C. within 8 hours of a midnight power supply time zone in which the time switch 8 is ON. . The automatic temperature controller 3 having normally closed contacts opens the contacts when the water in the hot water storage tank 1 reaches 85 ° C.
The hot water storage tank 1 is filled with hot water of 85 ° C. every morning.

Recently, the above-mentioned water heater has been further improved, and an arithmetic unit is provided in the boiling control device, and the energization time to the heating element is arbitrarily shifted within the midnight power supply time period to achieve an average load during the midnight power supply time period. A water heater configured as such has emerged. FIG. 7 is a configuration diagram of an electric water heater configured to shift the energization time to the heating element.
The same components as those shown in the figure, 9 is hot water amount setting means, 10 is arithmetic means, 11 is midnight power detection means, and 12 is heating element control means.

In the figure, first, the presence or absence of a late-night power supply is checked by the late-night power detection means 11, and when the late-night power supply is supplied, the hot water temperature measurement means 3 measures the water supply temperature Tw and reads the used hot water quantity by the hot water quantity setting means. The amount of hot water used at this time is the amount of hot water at 42 ° C.

Assuming that the usage amount at 42 ° C. is V (1), the net energization time H can be calculated by the following equation.

Here, P: Heating element capacity 860: Heat value of 1 KWH 0.9: Efficiency Next, when the energization time to the heating element 2 is shifted to the latter half of the midnight power supply time zone, for example, the midnight power supply time is 8 hours. The energization start time Hp can be calculated as follows: Hp = 8−H (2)

In FIG. 7, the arithmetic means 10 calculates the above equation (1),
By calculating Hp by calculating (2) and inputting it to the heating element control means, the heating element is energized at time Hp in the midnight electrode supply time zone, and the latter half of the midnight power supply time zone is fully used. To heat the water and boil it.

[Problems to be Solved by the Invention] The boiling time of the electric water heater is within a specific midnight power supply time zone specified by the electric power company, and there is a limit to the time during which the water can be heated. However, in recent social life, the need for hot water supply has also been diversified, so there is a limit on the time that the water can be boiled, not according to the daily rhythm of daily life, as a user of the water heater It is desired that the water can be boiled at any desired time.

Further, in the above-described conventional water heater, when a large amount of hot water is used at a ceremonial occasion or the like, there is a problem that the amount of hot water is insufficient and the actual usage is not adapted.

The present invention has been made in order to solve the above-mentioned problems of the conventional apparatus, and it is possible to arbitrarily set a time period for energizing the heating element, and to make use of an electric hot water which can be driven at any time when a large amount of hot water is used. It is intended to provide a container.

[Means for Solving the Problems] A boiling water control device for an electric water heater according to the present invention includes a hot water storage tank, a heating element installed in the hot water storage tank,
Hot water temperature measuring means for measuring the boiling hot water temperature of the hot water storage tank, energizing time zone setting means for setting a main energizing time zone to the heating element and other time zones, and energizing the heating element. Heating element control means for controlling; remaining hot water amount detecting means for detecting the presence or absence of a predetermined remaining hot water quantity in the hot water storage tank; manual flicking setting means for setting to perform fogging by manual operation; Automatic heating setting means for setting to perform the heating element control means, the heating element control means, in the main energization time zone set by the energization time zone setting means, based on the measurement result of the hot water temperature measurement means A normal boiling operation for controlling the power supply to the heating element is performed, and in a time period other than the main power supply time period, the presence or absence of the manual setting by the manual setting device or the automatic setting device is determined. Chase When there is a hot water setting, the power supply to the heating element is controlled based on the measurement result of the hot water temperature measuring means, and when there is an automatic hot water setting, the detection result of the remaining hot water amount by the remaining hot water amount detecting means and In accordance with the measurement result of the hot water temperature measurement means, to perform the driving operation to control the power supply to the heating element, and during the driving operation, when the main power supply start time is reached, from the driving operation to normal boiling The operation is switched to a raising operation.

[Operation] In the control device of the electric water heater configured as described above, the energization time zone setting means arbitrarily sets the main energization time zone to the heating element, and the manual chasing setting means chase by manual operation. Is set to be performed, and the automatic overtaking setting means is set to automatically perform overtaking.

Then, the heating element control means performs the following control based on the above settings. That is, in the main energization time zone set by the energization time zone setting means, a normal boiling operation for controlling energization to the heating element is performed based on the measurement result of the hot water temperature measurement means. In addition, in a time zone other than the main energizing time zone, it is determined whether or not the manual running setting is performed by the manual running setting unit or the automatic running setting unit. A driving operation for controlling the energization of the heating element is performed based on the measurement result of. On the other hand, if it is determined that there is an automatic
Based on the detection result of the remaining hot water amount by the remaining hot water amount detection means and the measurement result of the hot water temperature measurement means, a driving operation for controlling the energization of the heating element is performed. Also, when the main energization start time comes during the driving operation, the driving operation is switched from the driving operation to the normal boiling operation.

[Embodiment of the Invention] FIG. 1 is a configuration diagram of an electric water heater showing an embodiment of the present invention, and FIG. 2 is an electric circuit diagram thereof. In FIG.
Reference numerals 1 to 6 denote the same or equivalent parts as those of the conventional apparatus, 15 denotes a heating element control means, 16 denotes an energization time zone setting means.
The heating element control means 15 controls the energization of the heating element 2 in accordance with the information of (1) to boil water in the tank 1.

Reference numeral 17 denotes a remaining hot water amount detecting means, 18 denotes an automatic purging means, and 19 denotes a manual purging means.

FIG. 2 shows a detailed structure of the boiling control device, wherein 21 is a hot water temperature measuring means for measuring a boiling temperature, 22 is a resistor, both of which are connected in series between a positive terminal + V and a ground terminal. The connection between the resistor 22 and the temperature measuring device 21 is connected to an analog multiplexer 24 of a microcomputer 23. Further, the remaining hot water amount detecting means 92 composed of a thermistor is
The resistor 93 is connected between the positive terminal + V and the ground in series with the resistor 93, and the connection between the resistor 93 and the remaining hot water amount detecting means 17 is connected to the analog multiplexer 24.

The microcomputer 23, which is a component of the heating element control means 15, includes an analog multiplexer 24, an A / D converter 25,
It comprises an input circuit 26, a CPU 27, a memory 28, and an output circuit 29.

Reference numeral 30 denotes a circuit for performing ON / OFF control of the heating element 2. The circuit 30 includes resistors 31, 32, a transistor 33, relays 34, 35, diodes 36, 37, and the like. The base of the transistor 33 is connected to the output circuit 29 of the microcomputer 23 via the resistor 31. The normally open contact of the relay 34 is connected to the ground terminal via the positive terminal + V 'and the coil of the relay 35,
Diodes 36 and 37 are connected in parallel, respectively. Reference numeral 2 denotes a heating element connected in series between a normally open contact and a power supply 7 which can always be used.

Further, the automatic driving setting means 18 and the manual driving setting means 19 each comprising a switch are connected to the power supply + V and the ground terminal together with the energizing time zone setting means 16 in series with the resistors 91 and 95, and are connected to each switch resistance. The connection unit is connected to the input circuit 26 of the microcomputer 23. In addition,
38 is a display circuit, and 39 is a display means.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. At the same time when the power is turned on, the current time is set (step 100), and then the main power supply start time is set (step 101), and the power supply stop time is set (step 102). Next, it is determined whether or not the main energization start time has been reached (step 103). In the case of YES, the boiling temperature is set to a predetermined value, for example, 90 ° C. (step 108). The output signal is applied to the transistor 33 of the heating element control circuit 30, the relays 34 and 35 are operated to open the power supply circuit, and the power supply to the heating element 2 is started (step 109). Next, the hot water temperature Tm1 in the hot water storage tank is measured by the temperature measuring device 21 (step 110), and the hot water temperature Tm1 and the boiling temperature T are compared by the CPU 27 (step 11).
1) If Tm1 has not reached T, energization is continued. If Tm1 reaches T, the output signal from the output circuit 29 is cut off and the relay
35 is opened to turn off the power supply circuit to the heating element 2 (step 112), and the control is completed.

If it is not the main energization start time in step 103,
It is determined whether or not there is an automatic overtaking setting (step 104), and YES
In this case, the remaining hot water amount is detected by the remaining hot water amount detecting means 17 (step 105), and if there is no remaining hot water amount, the process proceeds to step 108. In step 104, if there is no automatic follow-up setting,
It is determined whether or not the manual feeding is set (step 107). If the setting is set, the boiling temperature is set manually and the heating element is energized.

In the operation after step 108, the heating element 2 is heated to the boiling temperature T by energizing, and when the hot water temperature reaches T, the energizing of the heating element is stopped (step 112). In the embodiment, the heating up to the predetermined temperature is performed only once, and re-energization is not performed.

Note that, in the present embodiment, the automatic flush setting means 18
Although an example using two means of the manual sweep setting means 19 has been described, either of them may be used.

Since the water heater in the present embodiment is configured as described above, even when the amount of hot water used is large and the amount of hot water tends to be short, it is not during the midnight power supply time period or other than the time period set by the power supply time period setting means. However, when the amount of remaining hot water in the hot water storage tank becomes equal to or less than a predetermined amount, the heating element in the tank can be automatically or manually energized, so that the hot water does not run out.

FIG. 4 is a flowchart showing still another embodiment,
In the water heater having the same configuration as the embodiment shown in FIGS. 1 and 2, the operation program is different. In FIG. 4, first, the current time is set (step 12).
0) Then, the main energization start time is set (step 121), the energization stop time is set (step 122), the boiling temperature is set (step 123), and then the main energization start time is determined (step 124). If step 124 is YES, the operation after step 125 to energize the heating element 2 is the same as the operation after step 109 in the embodiment shown in FIG. If it is not the large energization start time in step 124, it is determined whether or not automatic flushing is set (step 129). If YES, the remaining hot water amount detecting means 17 detects the amount of hot water in the hot water storage tank. Measure the hot water temperature Tm2 (step 13
2) Boiling Tm2 and comparing it with a predetermined temperature T (step 13)
3) If the hot water temperature Tm2 is not higher than the predetermined temperature T, power is supplied to the heating element 2 (step 135). Meanwhile, step 1
In the judgment of 33, when the hot water temperature Tm2 becomes higher than the predetermined temperature T, the power supply to the heating element 2 is stopped (step 13).
Four). While the heating element 2 is energized or de-energized,
It is determined whether or not the main power supply start time has come (step 136). If the main power supply start time has come, if the power supply to the heating element 2 is ON, it is turned off (step 13).
7) Switch from driving operation to normal boiling operation.

If there is no automatic overtaking setting in the determination at step 129, it is determined whether or not the manual overtaking setting is set (step 138). If there is a setting, the process proceeds to step 132, and if there is no setting, step 124 is performed. Move to the processing of.

The present embodiment is different from the previous embodiment in that the heating element is ON / OFF controlled in accordance with the temperature of the hot water. Since the heating element is energized and the energization of the heating element is turned ON / OFF according to the temperature of the hot water, there is no danger of running out of the hot water, and the hot water of the appropriate temperature can always be used.

[Effects of the Invention] As described above, in the present invention, since the control device of the electric water heater is provided with the energization time zone setting means, the main energization time zone of the heating element can be set arbitrarily, and the rhythm of life Now you can use a water heater. In addition, since automatic or manual expelling setting means is provided, even during periods other than the power-on time period, if the amount of remaining hot water decreases, expelling is automatically or manually started, and at the time of the ceremonial occasion Even when the amount of hot water used increases, as in the case of, for example, there is no need to worry about running out of hot water. In addition, when the main energization start time comes during the driving operation, the operation is switched from the driving operation to the normal boiling operation, so that, for example, the set temperature and the capacity of the heating element are set between the driving operation and the normal boiling operation. By changing the value, power consumption can be saved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electric water heater according to one embodiment of the present invention,
FIG. 2 is an electric circuit diagram, FIG. 3 is a control flowchart of one embodiment, FIG. 4 is a control flowchart of another embodiment, FIG. 5 is a configuration diagram of a conventional electric water heater, and FIG. The figure is an electric circuit diagram, and FIG. 7 is a configuration diagram of another conventional electric water heater. In the figure, 1 is a hot water storage tank, 2 is a heating element, 21 is a hot water temperature measuring means,
Reference numeral 15 denotes a heating element control unit, 16 denotes an energization time zone setting unit, 17 denotes a remaining hot water amount detection unit, 18 denotes an automatic tapping setting unit, and 19 denotes a manual tapping setting unit. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. A hot water storage tank, a heating element installed in the hot water storage tank, a hot water temperature measuring means for measuring a hot water temperature of the hot water storage tank, a main power supply time zone to the heating element, and other Energizing time zone setting means for setting the time zone of the heating element, heating element control means for controlling energization to the heating element, remaining hot water amount detecting means for detecting the presence or absence of a predetermined remaining hot water amount in the hot water storage tank, and manual operation The manual heating setting means for setting to perform the driving, and the automatic driving setting means for setting to perform the automatic driving. The heating element control means includes the energization time zone setting means. In the main energizing time zone set in, performs a normal boiling operation to control the energization to the heating element based on the measurement result of the hot water temperature measuring means, in the time zone other than the main energizing time zone, Manual follow-up settings It is determined whether or not there is a flushing setting by a step or automatic flushing setting means. If there is a manual flushing setting, the power supply to the heating element is controlled based on the measurement result of the hot water temperature measuring means, and the automatic flushing is controlled. When there is a soaking setting, the remaining hot water amount is detected by the remaining hot water amount detecting means and the follow-up operation for controlling the energization to the heating element based on the measurement result of the hot water temperature measuring means is performed. A boiling water control device for an electric water heater, characterized in that when a main energization start time is reached during a running operation, the running operation is switched from a running operation to a normal heating operation.