JPH04281155A - electric water heater - Google Patents

Abstract

PURPOSE:To prevent the shortage of hot water quantity by enabling a fixed amount of hot water to be maintained at a specified temperature all the time and resupplying a spent amount of hot water even if a large amount of hot water is spent. CONSTITUTION:When an automatic additional heating setting means 2 is set, the power supply to a lower part heating medium 101 is controlled based on a water temperature detected by a residual hot water detection means 5 and a lower part water temperature detected by a lower part hot water measurement means 103. When a manual additional heating setting means 1 is set, the power supply to an upper part heating medium 102 is controlled based on the upper part temperature detected by an upper part hot water temperature measurement means 104. When the automatic additional heating setting means 2 and the manual additional heating setting means 1 are not set, the power supply starts from the upper part heating medium based on the charging time and the charging start time computed by an arithmetic operation means 4 and power supply is controlled based on the temperature detected by the upper part hot water temperature measurement means. When the temperature exceeds a specified value, the power supply is changed over to the lower part heating medium and controlled based on the temperature detected by the lower part hot water measurement means. When the temperature exceeds a set value, the power supply is changed over to the upper part heating medium 102.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater that controls hot water temperature, hot water amount, and energization time.

0002

2. Description of the Related Art FIG. 14 is a block circuit showing a conventional electric water heater, and FIG. 15 is an electric circuit diagram of the main part of FIG. In FIG. 14, 100 is a hot water storage tank that has a water supply pipe at the bottom and a hot water sampling pipe at the top, and is always filled with hot water, and 101 is a lower heating element disposed at the bottom of the hot water storage tank 100. , 102 is an upper heating element disposed at the upper part of the hot water storage tank 100. 103 is provided at the lower side wall of the hot water storage tank 100 and measures the water supply temperature and boiling temperature of the hot water storage tank 100. 104 is provided at the upper side wall of the hot water storage tank 100 and measures the boiling temperature by the upper heating element 102. This is an upper hot water temperature measuring means for measuring temperature. 105 is a water temperature setting means for setting the boiling temperature; 106;
is a calculating means that calculates the energization start time and the actual net energization time based on the set temperature information from the hot water temperature setting means 105 and the measured temperature information from the lower hot water temperature measuring means 103. 107 is a late-night power detection means for detecting whether late-night power is supplied to the lower heating element 101; 108A is temperature information from the lower hot water temperature measuring means 103, information calculated by the calculation means 106, and detection by the late-night power detection means 107; This lower heating element control means performs ON/OFF control of the lower heating element 101 based on the information obtained. Reference numeral 109 indicates an additional heating setting means for setting the energization time of the upper heating element 102, and 110A indicates an upper heating element based on the energization information set by the additional heating setting means 109 and the temperature information measured by the upper hot water temperature measuring means 104. 102 is an upper heating element control means for ON/OFF control.

In FIG. 15, 103a is a resistor connected in series with lower hot water temperature measuring means 103 made of a thermistor, etc., and 104a is upper hot water temperature measuring means 1 made of a thermistor etc.
A resistor 105a is connected in series with the hot water temperature setting means 105, which is a variable resistor or the like. And the respective resistors 103a, 104a, 105
a. The detected values from the upper and lower hot water temperature measuring means 103, 104 and the hot water temperature setting means 105 are input to an analog multiplexer (described later) of the microcomputer. 1
11 is a power source for late-night power; 112 is a resistor that steps down the voltage of the power source for late-night power; 113 is a diode that rectifies the power source stepped down by the resistor 112; 114 is a phototransistor that operates with the stepped-down power source; and 115 is a phototransistor 11.
This is a pull-up resistor that supplies power to 4. 116 is a resistor 112, a diode 113, a phototransistor 114
and a pull-up resistor 115.
This circuit constitutes 07. In addition, the late-night power detection means 10
The signal detected at step 7 is output to the input circuit (described later) of the microcomputer via the pull-up resistor 115. Reference numeral 117 denotes a circuit constituting the reheating setting means 109 consisting of a switch, etc., and 117a denotes a pull-up resistor that supplies power to the circuit 117 constituting the reheating setting means 109.

Reference numeral 118 denotes an analog multiplexer that selects and outputs information on the measured temperature and set temperature from the lower hot water temperature measuring means 103, the upper hot water temperature measuring means 104, and the hot water temperature setting means 105. 119 is analog multiplexer 1
120 is an A/D conversion circuit that A/D converts the information selected at 18, information A/D converted by the A/D conversion circuit 119, information from the circuit 116 constituting the late-night power detection means, and additional heating. This is an input circuit that inputs information from the circuit 117 that constitutes the setting means. 121 is lower water temperature measuring means 1
03, a CPU that performs arithmetic processing based on information from the upper hot water temperature measurement means 104, the hot water temperature setting means 105, the circuit 116 that constitutes the late-night power detection means, and the circuit 117 that constitutes the reheating setting means; This is a memory that stores energization control programs, etc. 123 is CPU121
This is an output circuit that outputs the information processed in the above to a circuit (described later) constituting the upper heating element control means or a circuit (described later) constituting the lower heating element control means. 12
4 is analog multiplexer 118, A/D conversion circuit 1
19, a microcomputer consisting of an input circuit 120, a CPU 121, a memory 122, and an output circuit 123.

125 and 126 are resistors, 127 is a transistor, and one side of the resistor 125 is connected to the microcomputer 12.
4 output circuit 123, and the other side is connected to the transistor 1 output circuit 123.
27 and the resistor 126 is connected to the base of transistor 1
27 is connected between the base and emitter of transistor 1.
27 biases are set. Reference numeral 128 denotes a first relay connected between the collector of the transistor 127 and the power supply V. When the transistor 127 is turned on, the power supply V is supplied to the coil of the first relay 128, closing the contacts. A diode 129 is connected to both ends of the coil of the first relay 128 and suppresses a loop voltage when the first relay 128 is turned on. 130 is a second relay connected between the contact terminal of the first relay 128 and the ground, and when the contact of the first relay 128 closes,
Power supply V1 is supplied to the coil of second relay 130 to close the contacts. A diode 131 is connected to both ends of the coil of the second relay 130 and suppresses a loop voltage when the second relay 130 is turned on. 132 is resistance 12
5, 126, transistor 127, first relay 128
, a diode 129, a second relay 130, and a diode 131. 133 is a power source connected to both ends of the contacts of the second relay 130 via the lower heating element 101.

134 and 135 are resistors, 136 is a transistor, and one side of the resistor 134 is connected to the microcomputer 12.
4 output circuit 123, and the other side is connected to the transistor 1 output circuit 123.
36 and the resistor 135 is connected to the base of transistor 1
36 is connected between the base and emitter of transistor 1
36 biases are set. A third relay 137 is connected between the collector of the transistor 136 and the power source V. When the transistor 136 is turned on, the power source V is supplied to the coil of the third relay 137, closing the contacts. A diode 138 is connected to both ends of the coil of the third relay 137 and suppresses a loop voltage when the third relay 137 is turned on. 139 is a resistor 134,
135, a transistor 136, a third relay 137, and a diode 138.
It is a 10A circuit. Reference numeral 140 denotes a power source connected to both ends of the contacts of the third relay 137 via the lower heating element 101.

The conventional electric water heater is constructed as described above, and FIG. 16 is a flowchart showing the control of the heating element stored in the memory of FIG. 15, and the operation will be explained.

First, the CP of the microcomputer 124
After starting the program, the CPU 121 determines whether late-night power is supplied from the circuit 116 that constitutes the late-night power detection means (step 150), and if there is late-night power supply, the CPU 121 detects the late-night power supply from the circuit 116 that constitutes the late-night power detection means.
6 into the input circuit 120, and a timer (internal timer) for counting elapsed time by program processing is started (step 151). Next, C
The PU 121 measures the temperature Tw of the supplied water from the lower hot water temperature measuring means 103 provided at the lower part of the hot water storage tank 100 (step 152), and reads the operating temperature T set by the hot water temperature setting means 105 (step 153). . Next, the CPU 121 calculates the net energization time H of the lower heating element 101 using the following formula from the water supply temperature Tw read from the lower hot water temperature measurement means 103 and the temperature T set by the hot water temperature setting means 105 (step 154). . H=V・(T-Tw)/860・P・0.9Here, P
…Capacity of lower heating element V…Capacity of hot water storage tank 860…Calorific value of 1Kwh 0.9…Efficiency of lower heating element

[0009] Next, the CPU 121 calculates the power supply start time in the middle of the night based on the program (step 15).
5). Here, in order to efficiently use late-night electricity with low electricity rates, it is necessary to
It is desirable that the water temperature in the tank has finished boiling.For example, if the midnight power supply time is from 11:00 p.m. to 7:00 a.m. the next morning, the power supply start time Hp is Hp = 23:00.
+(8-H). That is, if the net energization time is 4 hours, the energization start time Hp is 3:00 am.

Next, the CPU 121 determines whether the calculated energization start time Hp has passed (step 15).
6). Then, when the power supply start time arrives, the CPU 121
From the output circuit 123 of the microcomputer 124 to the transistor 1 of the circuit 132 constituting the lower heating element control means
27 and turns on the relays 128 and 130 to start energizing the lower heating element 101 (step 15).
7).

Next, the CPU 121 operates the lower hot water temperature measuring means 1.
03, the lower hot water temperature Tm1 of the hot water storage tank 100 is measured (step 158). Then, the CPU 121 compares the boiling temperature T set by the hot water temperature setting means 105 and the measured temperature Tm1, and determines whether the measured temperature Tm1 is equal to or higher than the set boiling temperature T, If the boiling temperature is below T, the process returns to step 158; if the boiling temperature is above T, the process proceeds to the next step (step 15).
9). When the temperature inside the hot water storage tank 100 is equal to or higher than the boiling temperature T, the CPU 121 controls the microcomputer 12
The voltage of the transistor 127 of the circuit 132 constituting the lower heating element control means is cut off from the output circuit 123 of No. 4, the relays 128 and 130 are released, and the energization of the lower heating element 101 is stopped, and the process returns to step 150 again (step 160). )
.

On the other hand, if there is no late-night power supply from the circuit 116 constituting the late-night power detection means in step 100,
The CPU 121 determines whether the reheating start switch of the circuit 117 constituting the reheating setting means is set (ON state).
If the switch is not set, the process returns to step 150, and if the switch is set, the process proceeds to the next step (step 161). If the reheating start switch is set, the CPU 121 measures the upper hot water temperature Tm2 of the hot water storage tank 100 using the upper hot water temperature measuring means 104 (step 162). And the CPU
121 compares the boiling temperature T set by the hot water temperature setting means 105 and the temperature Tm2 measured by the upper hot water temperature measuring means 104, and if the measured temperature Tm2 is lower than the set boiling temperature T If the temperature is higher than the boiling temperature T, the process proceeds to step 165 (step 163). If the boiling temperature is below T, the CPU
121 is an output circuit 123 of the microcomputer 124
A voltage is applied to the transistor 136 of the circuit 139 constituting the upper heating element control means to turn on the relay 137 and start energizing the upper heating element 102 (step 16
4). In addition, if the boiling temperature is higher than T, CPU1
21 cuts off the voltage of the transistor 136 of the circuit 139 constituting the upper heating element control means from the output circuit 123 of the microcomputer 124, releases the relay 137, and stops energizing the upper heating element 102 (step 165).
. Next, the CPU 121 again determines whether or not late-night power is supplied from the circuit 116 constituting the late-night power detection means, and if no late-night power is supplied, the CPU 121 returns to step 162.
If there is power supply late at night, the process proceeds to the next step (step 167). If there is late-night power supply, C.
The PU 121 stops energizing the upper heating element 102, ends boiling using the daytime power supply, and returns to step 150 again (step 167).

[0013]

[Problems to be Solved by the Invention] In the conventional electric water heater as described above, the inside of the hot water storage tank 100 can be heated using the lower heating element 101 only during the hours when electricity is supplied late at night. However, there was a problem in that the heating by the upper heating element 102 was limited to the daytime hours.

[0014] Furthermore, since boiling using late-night electricity is performed only by the lower heating element 101, there is a problem in that it takes a long time to boil the entire hot water storage tank 100 to the target temperature at low water temperatures, making it impossible to use it immediately. Furthermore, when the amount of hot water used is large, there is a problem that the amount of hot water at the target temperature cannot be satisfied with respect to the amount of hot water used, resulting in a shortage of hot water. This invention was made to solve this problem.It boils hot water at any time according to the required amount, and when the remaining amount of hot water falls below a predetermined amount, it automatically boils the set amount, and always keeps the hot water in the hot water storage tank. The purpose of the present invention is to obtain an electric water heater that can secure a constant amount of hot water and a constant temperature within the water heater.

[0015]

[Means for Solving the Problems] An electric water heater according to the present invention includes a lower heating element provided in a lower part of a hot water storage tank;
an upper heating element provided at the upper part of the hot water storage tank; a lower hot water temperature measuring means provided at the lower side of the hot water storage tank for measuring the temperature of the lower water in the hot water storage tank; an upper hot water temperature measuring means provided on a side surface of the hot water storage tank for measuring the temperature of hot water in the upper part of the hot water storage tank; a remaining hot water amount detection means provided on a side surface of the hot water storage tank for detecting a temperature of water supplied to the hot water storage tank; It has a built-in hot water temperature setting means for presetting the boiling temperature of the tank and a timer for counting the time, and the water temperature is determined based on the temperature set by the hot water temperature setting means and the temperature measured by the lower water temperature measuring means. a calculation means that calculates the energization time to the lower heating element and calculates the energization start time from the determined energization time during a predetermined energization time period; and a water temperature detected by the remaining hot water amount detection means. an automatic additional heating setting means that automatically sets the energization to the lower heating element when the upper heating element has the following configuration; a manual additional heating setting means that arbitrarily sets the energization time of the upper heating element; and a manual additional heating setting means that sets the energization time of the upper heating element. If the upper heating element is energized so that the upper temperature detected by the hot water temperature measuring means reaches a predetermined temperature, and the automatic additional heating setting means and the manual additional heating setting means are not set. , starting energization of the upper heating element according to the energization time and energization start time calculated by the calculation means;
upper heating element control means that stops energization when the temperature detected by the upper hot water temperature measuring means exceeds a set value and outputs a switching command to switch energization to the lower heating element; and the automatic additional heating. When the setting means is set, the lower heating element is energized and controlled so that the temperature detected by the remaining hot water amount detecting means and the lower temperature detected by the lower hot water temperature measuring means become predetermined temperatures. If the automatic additional heating setting means and the manual additional heating setting means are not set, energization of the lower heating element is started by a switching command from the upper heating element control means, and the temperature detected by the lower hot water temperature measuring means is increased. The apparatus further includes a lower heating element control means that stops energization when the value exceeds a set value and outputs a switching command to switch energization to the upper heating element. Further, the configuration is such that the manual additional heating setting means and the second energization control means are excluded. Further, the remaining hot water amount detection means, the automatic additional heating setting means, and the first energization control means are omitted. Furthermore, the above-described residual hot water amount detection means, the automatic additional heating setting means, the manual additional heating setting means, the first energization control means, and the second energization control means are excluded.

[0016]

[Operation] In this invention, when the automatic additional heating setting means is set by the lower heating element control means, the water temperature detected by the remaining hot water amount detection means and the lower temperature detected by the lower hot water temperature measurement means are The lower heating element is energized to a predetermined temperature, and if the automatic additional heating setting means and the manual additional heating setting means are not set, the lower heating element is energized by a switching command from the upper heating element control means. When the temperature detected by the lower hot water temperature measurement means exceeds a set value, the energization is stopped and a switching command is output to switch the energization to the upper heating element. In addition, when the manual additional heating setting means is set by the upper heating element control means, the upper heating element is energized so that the upper temperature detected by the upper hot water temperature measuring means reaches a predetermined temperature, and automatic additional heating is performed. If the setting means and manual additional heating setting means are not set, energization of the upper heating element is started according to the energization time and energization start time calculated by the calculation means, and the temperature detected by the upper hot water temperature measuring means is higher than the set value. When this occurs, the power supply is stopped and a switching command is output to switch the power supply to the lower heating element.

[0017]

[Embodiment] FIG. 1 is a block circuit diagram of an embodiment of the present invention, FIG. 2 is an electric circuit diagram of the main part of FIG. 1, and FIG. 3 is a front view showing the operation section and display section of FIG. ~105,1
18 to 140 are the same as the conventional one. In the figure, 1
1 is a manual additional heating setting means in which a switch or the like is connected between the resistor 1a and the ground, and the connecting portion between the resistor 1a and the manual additional heating setting means 1 is connected to the input circuit 120 of the microcomputer 124. Note that one end of the resistor 1a is connected to the power supply V.
is connected to. Reference numeral 2 denotes an automatic additional heating setting means in which a switch or the like is connected between the resistor 2a and the ground, and a connecting portion between the resistor 2a and the automatic additional heating setting means 2 is connected to the input circuit 120 of the microcomputer 124. Note that one end of the resistor 2a is connected to the power supply V. 3 is each resistor 3
The current time setting means includes switches and the like connected between each resistor 3a, 3b, 3c and the ground, and the connection between each resistor 3a, 3b, 3c and the current time setting means 3 is connected to a microcomputer 12.
4 input circuit 120. 3A is a display changeover switch that changes the display of the current time and the set number of times of additional heating. 3B is a time (time)/additional heating setting switch for setting the time (time) and additional heating. 3C is a time (minute) setting switch for setting the time (minute). Note that one end of each of the resistors 3a, 3b, and 3c is connected to the power supply V. Reference numeral 5 denotes a remaining hot water amount detecting means disposed on any side of the hot water storage tank 100 to check the amount of hot water remaining in the hot water storage tank 100. The remaining hot water amount detecting means 5 consists of a thermistor connected between a resistor 5a and ground. , a connecting portion between the resistor 5a and the remaining hot water amount detection means 5 is connected to an analog multiplexer 118 of the microcomputer 124. In addition, resistance 5
One end of a is connected to the power supply V.

A display circuit 6 is connected to the output circuit 123 of the microcomputer 124 and amplifies the output signal from the output circuit 123. 7 is a display means connected to the display circuit 6 and the output circuit 123 of the microcomputer 124, and the output signal from the display circuit 6 and the output circuit 12 are connected to each other.
Display is performed based on the output signal from 3. 7A and 7B are lamps indicating the current time and the number of additional heating settings, respectively;
C is an indicator light which displays the current time when the current time lamp 7A is lit, and which displays the number of additional heatings when the lamp 7B indicating the set number of additional heatings is lit. In addition, when the display means 7 is turned on, the display unit lights up the lamp 7A indicating the current time, and the indicator lamp 7C indicates the time 00:00. When the display changeover switch 3A is operated, the current time lamp 7
A goes out and the additional heating setting lamp 7B lights up. At this time, the indicator light 7C displays the number of times of additional heating. If switch 3B is pressed in this state, indicator light 7C will be set to 0.
Shows 0 to 01, 02... Further, when the display changeover switch 3A is operated, the additional heating setting lamp 7B goes out.
The current time lamp 7A lights up.

The electric water heater of the present invention is constructed as described above, and FIG. 4 is a flowchart showing the operation of FIG. 1, and the operation will be explained. First, turn on the power and operate the operation section of the display means 7 to set the current time (Step 1)
0). Then, the CPU 121 reads the hot water temperature set by the hot water temperature setting means 105 (step 11). Next, the CPU 121 determines whether or not automatic additional heating is set in the automatic additional heating setting means 2. If automatic additional heating is set in the automatic additional heating setting means 2, the process proceeds to step 28, and the automatic If additional heating is not set, proceed to the next step (step 12). Next, C.P.
U121 determines whether manual additional heating is set in manual additional heating setting means 1, and if manual additional heating is set in manual additional heating setting means 1, step 3 is performed.
0, and if manual additional heating is not set, proceed to the next step (step 13). If manual additional heating is not set, the CPU 121 determines that the current time is within the main energization time period stored in the memory 12 (for example, the energization time period from 11:00 p.m. to 7 a.m. the next morning). If the current time does not fall within the main energization time period, the process returns to step 12, and if the current time falls within the main energization time period, the process proceeds to the next step (step 14).

The CPU 121 measures the temperature Tw of the supplied water from the lower hot water temperature measuring means 103 provided at the lower part of the hot water storage tank 100 (step 15), and reads the operating temperature T set by the hot water temperature setting means 105 ( Step 1
6). Next, the CPU 121 determines the net energization time H of the lower heating element 101 based on the water supply temperature Tw read from the lower hot water temperature measuring means 103 and the temperature T set by the hot water temperature setting means 105.
is calculated based on the formula H=V.(T-Tw)/860.P.0.9 (step 17). And CPU12
1 calculates the late-night energization start time based on the program (step 18). Next, the CPU 121 determines whether or not the calculated energization start time Hp has elapsed. If the time has not arrived, the CPU 121 waits; if the time has arrived, the process proceeds to the next step (step 19).

When the energization start time has arrived, the CPU 121 energizes the upper heating element 102 via the upper heating element control means 110 (step 20). Next, the CPU 121 measures the upper hot water temperature Tm2 via the upper hot water temperature measuring means 104 (step 21). Furthermore, the CPU 121 compares this upper water temperature Tm2 with the set water temperature T, and determines the upper water temperature Tm2.
If is lower than the set water temperature, return to step 25 again,
If the upper water temperature Tm2 is higher than the set water temperature, proceed to the next step (step 22). Next, the upper water temperature Tm2
When the water temperature reaches the set temperature, the CPU 121 turns the upper heating element to O.
FF is performed (step 23). Then, the CPU 121 energizes the lower heating element 101 via the lower heating element control means 107 (step 24). The CPU 121 measures the lower hot water temperature Tm1 via the lower heating element control means 107 (step 25). Next, the CPU 121 determines the lower water temperature Tm1.
and the set hot water temperature T, and if the lower hot water temperature Tm1 is lower than the set hot water temperature T, the process returns to step 25 again and the lower hot water temperature T
If m1 is higher than the set water temperature, proceed to the next step (
Step 26). If the lower hot water temperature Tm1 is equal to or higher than the set hot water temperature T, the CPU 121 turns off the lower heating element 101 via the lower heating element control means 107 (step 27). That is, the heating during the main energization time period starts from the upper heating element 102 and changes to the lower heating element 101.

In step 12, if automatic additional heating is set, the CPU 121 detects a fixed amount of remaining hot water in the hot water storage tank 100 using the remaining hot water amount detecting means 5 (step 2).
8). Next, if the CPU 121 determines that there is a fixed amount of hot water remaining in the hot water storage tank 100 by the remaining hot water amount detection means 5, the process returns to step 24, and if it is determined that there is no fixed amount of hot water remaining in the hot water storage tank 100, the CPU 121 returns to step 13. Return to

Further, in step 13, if manual additional heating is set, the CPU 121 turns on the upper heating element 102 via the upper heating element control means 110 (step 30). Next, the CPU 121 controls the upper hot water temperature measuring means 10.
4, the upper hot water temperature Tm2 of the hot water storage tank 100 is measured (step 31). Then, the CPU 121 compares the boiling temperature T set by the hot water temperature setting means 105 and the temperature Tm2 measured by the upper hot water temperature measuring means 104, and if the measured temperature Tm2 is lower than the set temperature T The process returns to step 31 again, and if the measured temperature Tm2 is equal to or higher than the set temperature T, the process proceeds to the next step (step 32). When the measured temperature Tm2 is equal to or higher than the temperature T, the CPU 121 turns off the upper heating element 102 via the upper heating element control means 110. Then, the process returns to step 12 again.

[0024] In this way, it is also possible to start energizing and set the heating time at any time, regardless of the late-night power supply time zone, to energize the lower heating element 2 and heat the supplied water. In addition, even if it is not the main energization time, if the automatic additional heating setting means is activated, the amount of remaining hot water is detected and if the amount of remaining hot water is less than a predetermined amount, the lower heating element 101 is automatically energized to supply water. Heating is also possible, and additional heating can be performed by forcibly energizing the upper heating element 3 through manual operation.

[0025] In this embodiment, during additional heating, repeatedly turning on and off the upper heating element 102 results in repeated heating and heat dissipation of the feed water, which results in wasted power consumption. To avoid this, it is also possible to set the number of additional heating times.

[0026] In this embodiment, an electric water heater is provided with a variety of functions and is equipped with various functions to provide an extremely efficient and user-friendly electric water heater. However, not all of the above functions are required, and depending on the purpose of use, a low-cost water heater may be required even if some functions are sacrificed. Some of such water heaters will be listed below as other examples.

FIG. 5 is a block diagram showing an electric water heater of another embodiment, FIG. 6 is an electric circuit diagram of the main part of FIG. 5, and FIG. 7 is a block diagram showing the electric water heater of another embodiment.
3 is a flowchart showing the operation of FIG. In FIGS. 5 and 6 of this embodiment, the manual additional heating setting means 1 of FIGS. 1 and 2 is removed. Further, in FIG. 7, the control flow of the manual additional heating setting means in steps 13 and 30 to 33 of FIG. 4 is removed, so a description of the operation will be omitted.

In this embodiment, the lower heating element 101 is energized to take precautions before the hot water runs out (heating the water supply, etc.), but if you forget to set automatic additional heating or the amount of hot water used is very small, the upper heating element 101 Boiling cannot be achieved by using only 102.

FIG. 8 is a block diagram showing an electric water heater of another embodiment, FIG. 9 is an electric circuit diagram of the main part of FIG. 8, and FIG. 10 is a flowchart showing the operation of FIG. 8. Figure 8 of this example
9, the residual hot water amount detection means and automatic additional heating setting means of FIGS. 1 and 2 are removed. Further, in FIG. 10, the control flow of the automatic additional heating setting means in steps 12, 28, and 29 of FIG. 4 is removed, so a description of the operation will be omitted.

In this embodiment, the manual additional heating setting means 1 heats the water supply by energizing the upper heating element 102 at any time regardless of the daytime hours of the conventional product, and also heats the water supply during the main energizing time. Electricity is started from the heating element 102 and switched to the lower heating element 101. This is sufficient if the amount of hot water used is small and additional heating is not required.

Furthermore, FIG. 11 is a block diagram showing an electric water heater of another embodiment, FIG. 12 is an electric circuit diagram of the main part of FIG. 11, and FIG. 13 is a flowchart showing the operation of FIG. 11. 11 and 12 of this embodiment are the same as those shown in FIGS. 1 and 2 with the control flow of the residual hot water amount detection means, manual additional heating setting means, and automatic additional heating setting means removed, so the operation will be explained. omitted.

In this embodiment, the current time is set by the current time setting means 62 having a clock function of the electric water heater.
If the main energization start time has been reached, the upper and lower heating elements 101, 1
02 is set as the main energization time, boiling starts from the upper heating element 102, and then from the lower heating element 101.
It was designed to boil water by switching to

[0033]

[Effects of the Invention] As described above, according to the present invention, the water in the hot water storage tank is automatically heated to boil it based on the water temperature in the hot water storage tank and the temperature in the lower part of the hot water storage tank. A constant amount of hot water is always secured at a predetermined temperature, allowing the user to use the system at any time, whether late at night or during the day.Also, the amount of hot water used is always appropriated, so when the amount of hot water used is large. However, there is no shortage of hot water in the hot water tank.

[0034] Furthermore, automatic boiling is performed based on the amount of hot water remaining in the hot water storage tank and the temperature at the lower part of the hot water storage tank, and automatic boiling of the hot water in the hot water storage tank based on the temperature at the upper part of the hot water storage tank and the set energization time of the upper heating element. Since it is possible to boil the amount of hot water, even if you forget to set the automatic boiling mentioned above, you can turn on the upper heating element and boil the amount of water in the hot water storage tank for use in a short time.

[0035] Also, since late-night electricity is used and the upper and lower heating elements are switched to boil the amount of water in the hot water storage tank, it is economical because it does not take a long time to boil water even at very low water temperatures. Furthermore, since the amount of hot water in the hot water storage tank is boiled at any time, it is possible to provide an extremely easy-to-use electric water heater that allows hot water to be used in accordance with the rhythm of daily life.

[0036]

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of an embodiment of the present invention.

FIG. 2 is an electrical circuit diagram of the main part of FIG. 1;

3 is a front view showing the operation section and display section of FIG. 1. FIG.

FIG. 4 is a flowchart showing the operation of FIG. 1;

FIG. 5 is a block diagram showing an electric water heater according to another embodiment.

FIG. 6 is an electrical circuit diagram of the main part of FIG. 5;

FIG. 7 is a flowchart showing the operation of FIG. 5;

FIG. 8 is a block circuit diagram showing an electric water heater according to another embodiment.

9 is an electrical circuit diagram of the main part of FIG. 8. FIG.

FIG. 10 is a flowchart showing the operation of FIG. 8;

FIG. 11 is a block circuit diagram showing an electric water heater according to another embodiment.

FIG. 12 is an electrical circuit diagram of the main part of FIG. 11;

FIG. 13 is a flowchart showing the operation of FIG. 11;

FIG. 14 is a block circuit diagram showing a conventional electric water heater.

15 is an electrical circuit diagram of the main part of FIG. 14. FIG.

FIG. 16 is a flowchart showing control of the heating element stored in the memory of FIG. 15;

[Explanation of symbols]

1 Manual additional heating setting means 2 Automatic additional heating setting means 3 Current time setting means 4 Arithmetic means 5. Remaining hot water amount detection means 100 Hot water storage tank 101 Lower heating element 102 Upper heating element 103 Lower water temperature measuring means 104 Upper water temperature measurement means 105 Water temperature setting means 108 Lower heating element control means 110 Upper heating element control means

Claims (4)

[Claims] 1. A lower heating element provided at the lower part of the hot water storage tank; an upper heating element provided at the upper part of the hot water storage tank; a lower hot water temperature measuring means for measuring the hot water temperature;
upper hot water temperature measuring means provided on the upper side of the hot water storage tank to measure the temperature of the upper water in the hot water storage tank; and upper hot water temperature measuring means provided on the side surface of the hot water storage tank to detect the temperature of water supplied into the hot water storage tank It has a built-in hot water amount detection means, a hot water temperature setting means for presetting the boiling temperature of the hot water storage tank, and a timer for counting the time, and the temperature set by the hot water temperature setting means and the lower water temperature measuring means are measured. Calculating the energization time to the lower heating element based on the temperature,
a calculation means for calculating the start time of energization based on the determined energization time during a predetermined energization time period; Automatic additional heating setting means for setting energization, manual additional heating setting means for arbitrarily setting the energization time of the upper heating element, and when the manual additional heating setting means are set, the upper hot water temperature measuring means The upper heating element is energized so that the detected upper temperature becomes a predetermined temperature, and when the automatic additional heating setting means and the manual additional heating setting means are not set, the energization time and A switching command that starts energizing the upper heating element according to the energization start time, stops energizing when the temperature detected by the upper hot water temperature measurement means exceeds a set value, and switches energization to the lower heating element. and the automatic additional heating setting means are set, the temperature detected by the remaining hot water amount detecting means and the lower temperature detected by the lower hot water temperature measuring means are set to a predetermined temperature. If the automatic additional heating setting means and the manual additional heating setting means are not set, the lower heating element is energized by a switching command from the upper heating element control means. and lower heating element control means that stops energization when the temperature detected by the lower hot water temperature measurement means exceeds a set value and outputs a switching command to switch energization to the upper heating element. An electric water heater characterized by: 2. A lower heating element provided at the lower part of the hot water storage tank; an upper heating element provided at the upper part of the hot water storage tank; a lower hot water temperature measuring means for measuring the hot water temperature;
upper hot water temperature measuring means provided on the upper side of the hot water storage tank to measure the temperature of the upper water in the hot water storage tank; and upper hot water temperature measuring means provided on the side surface of the hot water storage tank to detect the temperature of water supplied into the hot water storage tank It has a built-in hot water amount detection means and a timer for counting time, and calculates the energization time to the lower heating element based on the temperature set by the hot water temperature setting means and the temperature measured by the lower hot water temperature measuring means. In addition, in a predetermined energization time period, a calculation means calculates the energization start time based on the determined energization time, and when the water temperature is detected by the remaining hot water amount detection means, the lower heating element is automatically activated. automatic additional heating setting means for setting energization to the upper heating element; and if the automatic additional heating setting means is not set, energization of the upper heating element is started according to the energization time and energization start time calculated by the calculation means; upper heating element control means that stops energization when the temperature detected by the hot water temperature measurement means exceeds a set value and outputs a switching command to switch energization to the lower heating element; and the automatic additional heating setting means. is set, the lower heating element is energized so that the temperature detected by the remaining hot water amount detecting means and the lower temperature detected by the lower hot water temperature measuring means become predetermined temperatures, and the automatic follow-up is performed. If heating constant means is not set,
In response to a switching command from the upper heating element control means, energization of the lower heating element is started, and when the temperature detected by the lower hot water temperature measurement means exceeds a set value, the energization is stopped, and the upper heating element is stopped. An electric water heater characterized by comprising lower heating element control means for outputting a switching command for switching energization to the body. 3. A lower heating element provided at the lower part of the hot water storage tank, an upper heating element provided at the upper part of the hot water storage tank, and a lower part of the hot water storage tank provided at the lower side of the hot water storage tank. a lower hot water temperature measuring means for measuring the hot water temperature;
upper hot water temperature measuring means provided on the upper side of the hot water storage tank and measuring the upper water temperature in the hot water storage tank; and hot water temperature setting means for presetting the boiling temperature of the hot water storage tank;
It has a built-in timer that counts the time, and calculates the energization time to the lower heating element based on the temperature set by the hot water temperature setting means and the temperature measured by the lower hot water temperature measuring means. a calculation means for calculating the energization start time based on the determined energization time; a manual additional heating setting means for arbitrarily setting the energization time of the upper heating element; and the manual additional heating setting means. is set, the upper heating element is energized so that the upper temperature detected by the upper hot water temperature measuring means becomes a predetermined temperature, and when the manual additional heating setting means is not set, the calculating means According to the energization time and energization start time calculated in , energization is started from the upper heating element, and when the temperature detected by the upper hot water temperature measurement means exceeds the set value, energization is stopped, and the lower heating element is stopped. If the upper heating element control means outputs a switching command for switching energization to the body and the manual additional heating setting means are not set, energization of the lower heating element is started by a switching command from the upper heating element control means, and the and the lower heating element control means that stops energization when the temperature detected by the lower hot water temperature measurement means exceeds a set value, and outputs a switching command to switch energization to the upper heating element. Features: Electric water heater. 4. A lower heating element provided at the lower part of the hot water storage tank; an upper heating element provided at the upper part of the hot water storage tank; a lower hot water temperature measuring means for measuring the hot water temperature;
upper hot water temperature measuring means provided on the upper side of the hot water storage tank and measuring the upper water temperature in the hot water storage tank; and hot water temperature setting means for presetting the boiling temperature of the hot water storage tank;
It has a built-in timer that counts the time, and calculates the energization time to the lower heating element based on the temperature set by the hot water temperature setting means and the temperature measured by the lower hot water measuring means, and also calculates the energization time to the lower heating element. During the energization time period, a calculation means calculates the energization start time based on the determined energization time, and a calculation means starts energization from the upper heating element based on the energization time and the energization start time calculated by the calculation means; The upper heating element is energized so that the temperature detected by the upper hot water temperature measuring means reaches a predetermined temperature, and the energization is stopped when the temperature detected by the upper hot water temperature measuring means exceeds a set value. At the same time, upper heating element control means outputs a switching command to switch energization to the lower heating element, and energization of the lower heating element is started by the switching command from the upper heating element control means,
and lower heating element control means for stopping energization and outputting a switching command for switching energization to the upper heating element when the temperature detected by the lower hot water temperature measurement means exceeds a set value. Features: Electric water heater.