JPH04344068A - Electric hot water oven - Google Patents

Abstract

PURPOSE:To shorten a construction time and to reduce construction expenses in an electric hot water oven with a leakage water sensing function. CONSTITUTION:A heater is provided in a hot water storage tank for storing leakage water, and a leakage water sensor is provided on a leakage water tray for receiving leakage water from the tank, a pipe. A leakage water detector 26 for detecting a signal of the sensor is provided. Power of the detector 26 is supplied from a midnight power 15 in a midnight time zone at the time of energizing the midnight power, and supplied from a solar cell 25 in a daylight time zone at the time of deenergizing the midnight power.

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 equipped with a water leak detection function.

0002

BACKGROUND OF THE INVENTION In recent years, electric water heaters have been increasingly installed indoors in condominiums and the like, and there has been an increasing demand for electric water heaters with built-in water leakage sensors to prevent flooding due to water leakage.

Conventionally, this type of electric water heater has a configuration as shown in FIG. As shown in the figure, the late night power 1 is turned on only in the middle of the night and supplies power to the heater 3 according to the signal from the control circuit 2. However, even during the daytime when the late night power 1 is not turned on, the water leakage sensor When 4 detects a water leak, a buzzer 5 alerts the user that a water leak has occurred.
etc., it is necessary to notify. Therefore, the water leakage detection circuit 6 operates the buzzer 5, so the 100V power 7 and the late night power 1
Various types of power were wired and constantly supplied.

0004

[Problems to be Solved by the Invention] However, in the above-mentioned conventional configuration, wiring work for the 100V power 7 that is constantly supplied is required to notify users of water leaks during the daytime hours when the late night power 1 is off. This poses problems, such as burdening the construction company with labor and construction costs on the user.

[0005] The present invention solves the above-mentioned conventional problems, and aims to shorten construction time for contractors and provide an economical electric water heater for users.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention supplies power for a water leakage detection circuit from the late night power during the late night hours when the late night power is on, and when the late night power is off. The structure is such that power is supplied from solar cells during daytime hours.

[0007]

[Function] In the above configuration, the power source for the water leakage detection circuit is supplied from the late night power during the late night hours when the power is turned on, when the electromotive force of the solar cells disappears, and the electromotive force of the solar cells is easily generated during the bright daytime. During daytime hours when late-night power is off, power is supplied from solar cells.

[0008]

Embodiment An embodiment of the present invention will be described below with reference to FIG. As shown in the figure, a heater 12 is provided in a hot water storage tank 11 that stores hot water.
A water leakage sensor 14 is provided on a water leakage tray 13 that receives water leakage from the pipes and pipes. 2 is a circuit diagram, 12 is a heater, 14 is a water leakage sensor, 15 is a late-night power supply that is only energized during a limited late-night period (generally 8 hours from 11 p.m. to 7 a.m.), and 16 is a heater 12. This is a control circuit that performs energization control, and is composed of a power transformer 17, a rectifier diode 18, a smoothing capacitor 19, a constant voltage element 20, a control section 21, a resistor 22, a transistor 23, and a relay 24. 25 is a solar cell that serves as a power source during the daytime when the late night electricity 15 is not powered;
6 is a water leakage detection circuit that detects the signal of the water leakage sensor 14;
Reference numeral 7 indicates a buzzer that notifies water leakage, 28 indicates a diode that prevents current from flowing into the solar cell 25 during the late night hours when the late night power supply 15 is on, and 29 indicates a solar cell during the daytime hours when the late night power supply 15 is not on. 25 to control circuit 16
This is a diode that blocks current from flowing into the circuit.

[0009] In the above configuration, during the late night hours when the night power 15 is on, when it is dark and the electromotive force of the solar cell 25 is gone, a thermistor (not shown) for detecting the boiling temperature is used to close the hot water storage tank 11. Detects the water temperature of
When the water temperature is lower than the set temperature, an ON signal is output from the control unit 21, which turns on the transistor 23 and relay 24 via the resistor 22, thereby energizing the heater 12. Conversely, when the temperature is higher than the set temperature, an off signal is output from the control section 21, which turns off the transistor 23 and relay 24 via the resistor 22, thereby stopping the power supply to the heater 12. The hot water temperature in the hot water storage tank 11 is controlled as described above. The power transformer 17 of the control circuit 16 and the rectifier diode 1 are connected to the water leakage detection circuit 26.
8. Supply the DC voltage Vcc generated by the smoothing capacitor 19 via the diode 29. The water leak detection circuit 26 operates at this DC voltage Vcc during the late night hours when the late night power 15 is turned on, and monitors the signal from the water leak sensor 14 . When the water leak sensor 14 detects a water leak and outputs a signal, the water leak detection circuit 26 receives the signal and sounds a buzzer 27 to notify the user that a water leak has occurred.

[0010]Next, the late-night power 15, when it is bright in the daytime and it is easy to generate electromotive force in the solar cell, is the daytime period when the power is not on (
The operation during 16 hours from 7 a.m. to 11 p.m. will be explained. During the daytime hours when the late-night power supply 15 is not energized, the DC power supply Vcc of the control circuit 16 disappears, and the water leakage detection circuit 2
6 is supplied with electromotive force Vdd from the solar cell 25 via the diode 28. The water leakage detection circuit 26 operates with the electromotive force Vdd from the solar cell 25 and monitors the signal from the water leakage sensor 14. When the water leak sensor 14 detects a water leak and outputs a signal, the water leak detection circuit 26 receives the signal and sounds a buzzer 27 to notify the user that a water leak has occurred. However, in order for the solar cell 25 to generate an electromotive force, light is required, and depending on where the electric water heater is installed, there may be no artificial light (illumination) at night; However, since the time during which the water leakage detection circuit 26 does not operate is approximately 5 hours from around 6:00 pm at dusk to 11:00 pm when the late-night power supply 15 starts to be turned on, there is no substantial problem. Further, although the control circuit 16 does not operate due to a complete lack of power, there is no problem since this is a time period in which there is no need to control the energization of the heater 12.

[0011]

Effects of the Invention As is clear from the above embodiments, the electric water heater of the present invention can control the power supply of the water leakage detection circuit even in the dark at night.
In the middle of the night when the late-night power is on, when the electromotive force of the solar cells is lost, the power is supplied from the midnight power, and during the daytime when the late-night power is off, when it is bright and the solar cells can easily generate electromotive force, the solar cells are supplied with electricity. This configuration eliminates the need for wiring work for the 100V power that is constantly supplied, simplifying the work, shortening the construction time for contractors, and providing benefits to users. is economical as it can reduce construction costs.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of an electric water heater according to an embodiment of the present invention.

[
Figure 2: Circuit diagram of the electric water heater

[Figure 3] Circuit diagram of a conventional electric water heater

[Explanation of symbols]

11 Hot water storage tank 12 Heater 13 Water leakage tray 14 Water leak sensor 15 Late night electricity 16 Control circuit 25 Solar cells 26 Water leak detection circuit

Claims (1)

[Claims] Claims: 1. A hot water storage tank, a heater provided in the hot water storage tank, a water leak tray provided below the hot water storage tank, a water leak sensor provided on the water leak tray, and a water leak that detects a signal from the water leak sensor. The water leakage detection circuit includes a detection circuit and a control circuit that controls energization of the heater, and the water leakage detection circuit supplies power from the late-night power during the late-night hours when the late-night power is on, and during the daytime when the late-night power is off. is an electric water heater configured to supply power from solar cells.