JPH01230954A - Indication control device for water heater - Google Patents

Abstract

PURPOSE:To reduce the size and the number of components, by changing over each data obtained from a sample hot water measurement means, a residual hot water volume arithmetic operation means, and an operation suspended days judging means with a display change over means, and indicating said date with numerical indication light emitting diode. CONSTITUTION:A residual hot water volume arithmetic operation means 25 calculates the quantity of residual hot water in a hot water storage tank 1 based on Vz=V-Vw from the measurement result of a water supply measurement means 24 where Vz stands for residual quantity of hot water, Vw for quantity of supply water, hot water storage tank capacity for V. An indication means 27 indicates the result measured by a sample hot water temperature means 26, the result calculated by the residual hot water quantity arithmetic operation means 25, and the result decided by an operation suspended days decision means 8. An indication changeover means 28 indicates or changeover data about hot water, residual quantity of hot water or operation suspended days to an indication means. The input side of transistor arrays 37 and 38 are connected with an output circuit 36 of a microcomputer 30 while the output side is connected with the indication means 27. A light emitting diode 40 indicates numerical data while a light emitting diode 41a stands for hot water temperature, 41b for residual quantity of hot water and 41c for operation suspended days respectively as illustrated above.

Description

[Detailed description of the invention] [Industrial application field] This relates to a control device.

[Prior Art] Conventional devices of this type include those shown in FIGS. 4 and 5. FIG. 4 (A) is a block diagram showing a conventional display control device for this type of water heater. In the figure, <1) is a hot water storage tank, and a heating element (2) is attached to the lower part of the tank. (3a), (3b), and (3c) are residual hot water amount detection means for detecting the amount of hot water remaining in the hot water storage tank, and are attached to the wall of the tank, and (3a) is 150 t,
(3b) detects 100L, and (3c) detects 50L. (4) is the power supply for the heating element, (5) is the time switch,
This is to take in cheap late-night power from the power source (4). (6) is a late-night power determination means that determines whether or not late-night power is being supplied from the time switch (5). 7) is an operation stoppage number setting means for setting the number of days when boiling is stopped.

(8) is an operation stoppage number determining means, which compares the set number of boiling stop days with the result determined by the late night power determining means 6), and determines how many days remain to stop boiling.

<9) is the heating element control means, and the operation stop date setting means (8
), the energization of the heating element is controlled based on the result. (10)
are display means, remaining hot water amount detection means (3a), (3b),
The result of (3c) and the result of the operation stoppage number determination means (8) are displayed.

The display means (10) is constructed as shown in FIG. 4(B), and (11) is a light emitting diode for numerical display, which displays the number of days of outage determined by the number of outage days determining means (8). (12a) is a light emitting diode that displays the result of the remaining hot water amount detection means (3a), and (12b) is a remaining hot water amount detection means (3).
A light emitting diode (12c) displays the result of b), and a light emitting diode (12c) displays the result of the remaining hot water amount detection means (3c).

Next, the operation will be explained based on the flowchart shown in FIG. First, when the power (4) is turned on, in step (13), the number of days of outage set in the outage days setting means 7) is read, and in the next step (14), it is determined whether or not the operation is out of operation. If the operation is stopped, the number of days the operation is stopped is displayed in step (15). In the next step (16), it is determined whether the time switch (5) has changed from the ON state to the OFF state, and if the time switch (5) has changed to the OFF state, step (17)
), one day is subtracted from the number of days out of operation set by the number of days out of operation setting means (7), and the process ends as a new number of days out of operation.

Further, if it is determined in step (14) that the operation is not stopped, the process moves to step 18), the amount of remaining hot water is confirmed, and the amount of remaining hot water is displayed in the next step (19). In the next step (20), it is determined whether or not the time switch is in the ON state, and if it is in the ON state, boiling control is performed in step <21). Note that the boiling control in step (21) is not performed when the number of days for which the operation will be stopped is set, and accordingly, the heating element is not energized.

[Problems to be Solved by the Invention] As described above, in the conventional water heater display control device as described above, the number of outage days and the amount of remaining hot water are displayed independently for each function. There are problems in that the device becomes larger, a larger number of parts must be used, and the price becomes higher.

The present invention has been made to solve these problems, and aims to provide a display control device for a water heater that is small in size, has a small number of parts, and is inexpensive.

[Means for Solving the Problems] The display control device for a water heater according to the present invention displays data obtained from the hot water temperature measurement means, the remaining hot water amount calculation means, and the operation stop number determination means using the display switching means. By switching with , the number can be displayed using a single light-emitting diode for displaying numbers.

In the present invention, by switching the respective data obtained from the hot water sampling means, the remaining hot water amount calculating means, and the operation stoppage days determining means using the display switching means, one light emitting diode for numerical display can be used. Since it is decided to display the data, accurate numbers can be read for each data without increasing the number of light emitting diodes for displaying numbers.

[Example] Embodiments of the present invention will be described below with reference to the drawings (A).

FIG. 1 is a block diagram showing the configuration of a display control device for a water heater according to the present invention, and the same reference numerals as in FIG.
(22) The boiling water temperature setting means (i) presets the boiling water temperature in the hot water storage tank (1). (23) is the boiling water temperature setting means (
22) and the boiling water temperature measured by the boiling water temperature measuring means (23), and if the boiling water temperature is lower than the setting value ν), the heating element control means (9 ) is designed to supply a 3 m current to the heating element (2).

Further, (24) is a water supply amount measuring means, which measures the amount of water supplied into the hot water storage tank (1), and (25) is a remaining hot water amount calculating means, which is used to calculate the amount of water supplied to the water supply amount measuring means (24). From the results, the amount of remaining hot water in the hot water storage tank (1) is determined by the amount of remaining hot water Vz, the amount of water supplied V w , and the capacity of the hot water storage tank ■.
Calculate from V-Vw.

That is, in the structure of this hot water storage tank (1), the hot water storage tank (
The same amount of water as the hot water discharged from above in 1) is poured into the hot water storage tank (1).
), and the hot water storage tank (1) is always full of water, with a layer of hot water at the top and a layer of water at the bottom. Vz indicates the amount of hot water remaining in the upper part of the hot water storage tank (1). In addition, after the completion of boiling, that is, at the time when the boiling water temperature measuring means (23) indicates completion of boiling, Vz=V.

Further, (26) is a hot water temperature measurement means for measuring the temperature of the hot water sampled at the upper part of the hot water storage tank, and (27) is a display means that displays the result measured by the hot water temperature measurement means (26) and the remaining hot water amount calculation means. (25
) and the judgment result of the operation stoppage number judgment means (8) are displayed. (28) is a display switching means, and the display means (
27) Switch to display the hot water, the amount of remaining hot water, or the number of days the operation has been stopped.

FIG. 2 is a connection diagram showing the circuit FRt configuration of the device shown in FIG. An A/D converter (34) that converts the output of the analog multiplexer (33) into a digital value, an input circuit that inputs external signals (35), and outputs data. It is composed of an output circuit (36).

(37) and (38) are transistor arrays, and the input side is the output circuit (30) of the microcomputer (30).
36), and the output side is connected to display means (27). The operation of this transistor array (37) is as follows:
Normally, the potential on the output side is at the GND level, but if there is an output from the output circuit 36), the voltage on the output side becomes +Vc, and conversely, when the transistor array (38) operates, the potential level on the output side is normally +Vc, but the output circuit 36)
If there is an output from the terminal, it becomes the GND level. (40) are light emitting diodes for displaying numbers, (41a>, (41b>)
.

(41c) are light emitting diodes, (41a) emits light to indicate that the display of the light emitting diode (40) is the hot water temperature display, and (41b) emits light to indicate that the display of the light emitting diode (40). Indicates that it is a display of the amount of remaining hot water, and (41c) is a light-emitting diode (41c) when it emits light.
0) indicates the number of days the operation will be stopped.

(42) is a resistor connected in series with the sampling hot water temperature measuring means (thermistor) (26) between the positive terminal +Vc and GND, and the connection part with the hot water sampling hot water temperature measuring means (26) is analog. It is connected to a multiplexer (33). (43
) is a resistor connected in series with the boiling water temperature measuring means (23) between the positive terminal +Vc and GND, and the connection with the boiling water temperature measuring means <23) is connected to the analog multiplexer (33). It is connected. <81) is the boiling water temperature setting means (22) between the positive electrode terminal +Vc and GND.
The signal from the connection with the boiling water temperature setting means (22) is input to the analog multiplexer (33).

(44) is a resistor, (45) is a diode that half-wave rectifies the power supply (4), and (46) is a phototransistor.The light-emitting side of this phototransistor receives half-wave rectification from the power supply (4), and the light-receiving side becomes the emitter current of the transistor.

(47) is a resistor connected in series with the light receiving side of the phototransistor (6) between the positive terminal +Vc and GND, and the connection point with the light receiving side of the phototransistor (46>) is the resistor of the microcomputer (30). It is connected to an input circuit (35), and a signal smoothed by a capacitor (80) is input to the input circuit (35).

(48) is a resistor, which is connected in series with the operation suspension days setting means (7) between the positive terminal +Vc and GND, and the connection point with the operation suspension days setting means (7) is connected to the input circuit (35). has been done. (49) is a resistor, and display switching means (2
8) is connected in series between the positive terminal +Vc and GND, and the connection point with the display switching means (28) is the input circuit (35).
It is connected to the.

<50) is a pulse counter, and water supply amount measuring means (24)
The number of pulses is counted, and its output is connected to an input circuit (35) in a microcomputer (30).

Next, the operation of this invention will be explained. FIG. 3 is a flowchart showing the display control of the water heater stored in the program memory (32) in the microcomputer (30) shown in FIG. 2. By first turning on the power (4), In step (51), the temperature of the hot water at the top of the hot water storage tank (1) is measured, and in the next step (52), the measured water temperature is stored in the memory 32) for display.In the next step (53), settings are made. The set number of days (Ds) for which the operation has been stopped is read, and in step (54), this set number of days is stored in the memory (32) for display. Next step (55
), the set value (Ts) of the boiling water temperature is read, and in step (56), the amount of water supplied into the tank is measured. This amount of water supply is the same as the amount of hot water used, and step (5)
In step 7), the amount of remaining hot water is determined by subtracting the amount of water supplied from the amount of remaining hot water before starting water supply, and the new amount of remaining hot water is determined in step (58).
The data is stored in the memory (32) as display data.

Next, in step (59), it is determined whether the time switch <5) that limits the supply of late-night electricity has been switched from the OFF state to the ON state, and if it has been switched to the ON state, the operation is started in step (60). It is determined whether or not the number of outage days remains, and if there are no outage days remaining, energization to the heating element (2) is started in step (61), and if the number of outage days remains, the next step is performed. Proceed to (69).

Also, the time switch (5) is turned OFF in step (59).
If the state does not change from ON state to ON state, step (62
), it is determined whether the time switch remains in the ON state, and if it remains in the ON state, the process proceeds to step (63).
), measure the water temperature (Th) during boiling, and proceed to step (6).
In step 4), the boiling temperature (Ts) set in step (55) is compared with the hot water temperature (Th) measured in step (63), and if Ts≦Th, the heating element (2) is turned off in step (65). If Ts>Th, the process moves to step (69).

If the ON state of the time switch (5) does not continue in step (62), the process proceeds to step (66), where it is determined whether or not the time switch (5) has changed from ON to OFF. In step (67), it is determined whether or not the number of outage days Ds is O. If Ds≠0, Ds-1 is calculated in step (68), and the result is set as the new number of outage days.

Next, control of the display section in the display means (27) will be explained. In step (69), the display changeover switch in the display changeover means 28) is checked, and in step (7o) it is determined whether the display changeover switch is set to "hot water temperature", and if it is "hot water temperature", step In step (71), the "water temperature" that was not memorized in step (52) is set as display data, and in step (7
This display is performed in step 5).

Further, if the display changeover switch is not "hot water temperature" in step (70), it is determined in step (72) whether or not "remaining hot water amount J" is displayed, and if it is "remaining hot water amount", step (73
), the remaining hot water amount J stored in step (58) is used as display data, and this display is performed in step (75>).

Also, in step (72), the display changeover switch is set to 1 remaining hot water amount j.
If not, in step (74), step (54)
The number of outage days (Ds) stored in step 75 is used as display data, and this display is performed in step <75).

[Effect of the invention] As explained above, this invention is a display of water temperature.

By providing a switching means to display the remaining amount of hot water and the number of days the plant will be out of operation, a single light-emitting diode for displaying numbers is used for both purposes, resulting in fewer parts and lower manufacturing costs. be.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a connection diagram showing the circuit configuration of the device shown in Fig. 1, Fig. 3 is a flow chart showing display control of the water heater, and Fig. 4 is a conventional FIG. 5 is a block diagram showing the device of the prior art, and FIG. 5 is a flowchart showing the operation of the conventional device. (1) is a hot water storage tank, (2) is a heating element, (5) is a time switch, (6) is a means for determining late-night power, (7) is a means for setting the number of outage days, (8) is a means for determining the number of outage days, (9
) is a heating element control means, (22) is a boiling water temperature setting means, (23) is a boiling water temperature measuring means, 24) is a water supply amount measuring means, (25) is a remaining hot water amount calculation means, (26) (27) is a display means, and (28) is a display switching means. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A hot water storage tank configured to have a heating element attached to the lower part and automatically replenish from the lower part the same amount of water as the hot water discharged from the upper part; A water supply amount measuring means to measure, a remaining hot water amount calculating means for calculating the amount of remaining hot water in the hot water storage tank from the result of the water supply amount measuring means, a power source for the heating element for supplying power to the heating element from the outside, and the heating element. a time switch for introducing late-night power from the commercial power source; a late-night power determining means for determining whether the power introduced by the time switch is late-night power; and a setting for the number of days the hot water storage tank will not be heated. Means, means for determining a new number of days to stop boiling by comparing the number of days to stop boiling set by the number of days to stop boiling set by the number of days to stop boiling and the result determined by the late-night power determining means; heating element control means for controlling energization of the heating element based on the result of the heating element; boiling water temperature setting means for setting the boiling water temperature in the hot water storage tank; Boiled water temperature measuring means to measure, hot water temperature measuring means to measure the hot water temperature at the top of the hot water storage tank, display means having one light emitting diode for numerical display, data from the remaining hot water amount calculation means. A display for inputting data from the operation suspension days determination means and data from the hot water temperature measurement means, selecting one data from these data by switching, and sending this data to the display device. A water heater display control device equipped with a switching means.