JPS61116241A - Hot-water reserving type electric water heater - Google Patents

Abstract

PURPOSE:To permit a coutrol capable of coping with the change of hot-water set temperature or delivery of hot-water promptly by a method wherein the operation of necessary conducting time, which is effected in an operator, is effected repeatedly and continuously during the conduction time of midnight electric power. CONSTITUTION:When the conduction of midnight electric power is started, a midnight electric power detecting circuit 7 detects it and the count of a night time timer (HN) is started in a timer unit 8a. The hot-water set temperature (TS), detected by a temperature regulating volume 5, and a water temperature (TW) are taken into a micro-computer 8 while the necessary conduction time (HS) and the shift time (HP) of conduction starting are operated in the operator 8b. When a condition HN>=HP is established, a signal is outputted from the micro-computer 8 to a heater driving circuit 9 and the conduction of a heater is started. When the condition HN>=HP is not established, the operation is returned to a starting point again to repeat the operations from the decision of midnight electric power conduction and the shift time (HP) of conduction starting may be renewed successively in accordance with the advance of count of the nighttime timer (HN).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water storage type electric hot water company that utilizes late-night electricity and is widely used in homes as a water heater.

The configuration of the conventional example and its problems The operation flowchart of the conventional hot water storage type electric water heater is shown in Figure 1.
As shown in the figure. In the figure, first, when the late-night power supply starts, it is detected, the water temperature (Ts'C) is set by the water temperature setting means, and the water temperature (Tw') is detected by the water temperature sensor at the bottom of the tank. C), and using the following formula, calculate the required energization time (Hs) of the heating element and
The energization start soft time (HP) is calculated by the calculator.

HS = Y (TS-TW) 860 On the other hand, the timer device starts counting the night timer (HN), and finally compares the night timer (HN) with the energization start shift time (Hp), and when HN≧Hp, The configuration is to start supplying electricity to the heating element.

However, in such conventional examples, the late-night power l[
If the 11th electric start time, for example 231f-, 'jK, the shift time (Hp) to start energizing the heating element is determined, and this update will not be performed thereafter, so the hot water may run out after 23:00. There was a problem in that it was not possible to respond when the hot water temperature setting was changed. For this reason, for example, there is no hot water used immediately after 11pm and the water temperature (Tw) at the bottom of the hot water storage tank is 70'C, but 30 minutes later, hot water is used and TW = 30°C. When the value changes, calculations are made using the following conditions, as shown in the table below.

H=8 hours, V=370g, P=4.4KW, but,
In the conventional example, the energization start shift time (Hp) has already been set to 6.
Since the time period has been determined to be 4 hours, the heating element is energized for 1 hour.
．． The problem arises that the water temperature is not reached to the set water temperature because it is carried out for only 6 hours.

A similar problem occurs when the hot water temperature setting is changed to a higher value after 11pm.

Purpose of the Invention The present invention solves the above-mentioned conventional problems.Even if the set hot water temperature is changed or the hot water is used during the contract usage time of late-night electricity, it is possible to quickly respond to the change. This is to control the situation so that it can be carried out.

Structure of the Invention The structure of the invention for achieving the above object includes a hot water temperature or hot water amount setting means for presetting the temperature or amount of hot water to be used stored in a hot water storage tank, and a water temperature sensor that detects the water temperature at the bottom of the hot water storage tank. , a computing unit that calculates the required energization time of the heating element from the set value set by the hot water temperature or water amount setting means and the water temperature detected by the water temperature sensor; A timer device is provided for starting energization of the heating element so as to obtain the energization time, and the calculation of the required energization time of the computing unit is repeatedly and continuously performed during the midnight power energization time. be.

DESCRIPTION OF A PRACTICAL EXAMPLE Hereinafter, one embodiment of the wooden invention will be described based on the drawings.

FIG. 2 is a longitudinal sectional view of the hot water storage type water heater of the present invention, and 1
1 is a hot water storage tank, 2 is a heater which is a heating element installed at the bottom of the hot water storage tank 1, and 3 is a hot water storage tank 1.
It is a water temperature sensor installed at the bottom of the.

Figure 3 is a control block diagram of the wood water storage type water heater, where 4 is a water temperature detection circuit that detects the signal from the water temperature sensor 3°, and 5
6 is a temperature control volume which is a water temperature setting means; 6 is a set water temperature detection circuit that detects the signal from the temperature control volume 5; 7
is a late-night power detection circuit that detects late-night power 11r1 electricity/outage. These signals are input to a microcomputer 8 having functions of an arithmetic unit 8b and a timer device 8a, and output to a heater drive circuit 9.

FIG. 4 is an operation flowchart of the hot water storage type water heater.

Next, the operation of the tree embodiment will be explained.

First, when the late-night power supply starts, the late-night power detection circuit 7 detects this and sends it to the microcomputer 8, and a night timer (HN) starts counting in the timer device 8a. On the other hand, the water temperature (T
W) is input to the microcomputer 8 via the water temperature detection circuit 4, and the set hot water temperature (Tw) detected by the temperature control volume 5 is input to the microcomputer 8 via the set hot water temperature detection circuit 6. , the required energization time ( ) (S) and the energization start shift time (Hp) are calculated. Thus obtained (Hp
) and the night timer (HN) are compared, and HN≧Hp
If the following conditions are met, the heater drive circuit 9 is transferred from the microcomputer 8
A signal is output to start energizing the heater.

On the other hand, if the condition HN≧Hp does not hold, the process returns to the starting point and repeats the process starting from the late-night energization determination.
As the count of the night timer (HN) progresses, the energization start shift time (HP) is finally updated.

Furthermore, once heater energization is started, the heater energization state is maintained without comparing HN and Hp. On the other hand, if the power is not on at night, the night timer (f(
By repeating only the routine for clearing N ), no calculations are performed, and preparations are made for the start of the next late-night power supply.

Generally, the speed at which the operation flowchart in FIG.
Made it end in less than m5. Therefore, since calculations are repeated in an extremely short period of time, and are constantly being performed during late-night power supply, the water temperature at the bottom of the hot water storage tank 1 (Tw'C) and the set hot water temperature (Ts' Even if C) is changed by the consumer after the late-night power supply start time, the shift time for starting power supply to heater 2 is quickly changed, which prevents the trouble of not reaching the set water temperature. can. Furthermore, since the power supply to the heater 2 ends in the latter half of the late night power period, there is an effect that heat radiation loss can be reduced.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) Heat radiation loss can be reduced.

■　You can change the set water temperature even after the power is turned on late at night.

■ Even if hot water is needed after the power is turned on late at night, this can be handled.

[Brief explanation of the drawing]

Fig. 1 is an operation flowchart of a conventional hot water storage type electric water heater, Fig. 2 is a longitudinal sectional view of a hot water storage type electric water heater according to an embodiment of the present invention, Fig. 3 is a control block diagram thereof, and Fig. 4 is a flowchart of the same operation. 1...Hot water storage tank, 2...-Heater (combustor), 3...Water temperature sensor, 5...
Temperature control volume (hot water temperature setting means), 8a... timer device, 8b... calculator. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure N4

Claims (1)

[Claims] A hot water temperature or hot water amount setting means for presetting the temperature or amount of hot water to be used stored in the hot water storage tank, a water temperature sensor that detects the water temperature at the lower part of the hot water storage tank, and a setting value set by the hot water temperature or hot water amount setting means. A calculation unit that calculates the required energization time for the heating element of the hot water storage tank from the water temperature detected by the water temperature sensor, and a calculation unit that calculates the required energization time for the heating element of the hot water storage tank, and a calculation unit that calculates the required energization time for the heating element of the hot water storage tank at midnight power termination time. and a timer device for starting energization of the hot water storage type electric water heater, and the computation of the required energization time of the computing unit is repeatedly and continuously performed during the late-night power energization time.