JPS60202257A - Control circuit of hot water supplier - Google Patents

Abstract

PURPOSE:To prevent the scalding due to unexpected delivery of high temperature water from developing by a constitution wherein the hot water supply is stopped by closing a motor driven valve, when hot water temperature becomes higher beyond the set range of service hot water temperature, and the motor driven valve is opened only for a certain period of time by operating a manual switch equipped on a hot water supplier. CONSTITUTION:When hot water temperature becomes higher beyond the range of service hot water temperature, a comparator circuit 18 releases the drive of a relay 19, resulting in changing-over a contact 24 to a normally closed contact in order to actuate a motor valve 11 until the state to close a hot water supplying piping 8 is realized and then stopped. At this time, at the same time, an alarm is generated by an abnormal temperature alarming part 25. In order to make the spontaneous hot water supply possible, a switch 21 to release the motor valve 11 is equipped. When the switch 21 is closed, a timer circuit 20 is put into actuation so as to drive the relay 19 for a certain period of time in order to make hot water supply possible. After the predetermined time, the drive of the relay 19 is released, resulting in closing the hot water supplying piping.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a control circuit for a water heater, which constantly monitors the water temperature at the hot water supply inlet of the water heater and issues an alarm if the water temperature exceeds a preset allowable range. At the same time as generating and notifying the user,
This shuts off an electric valve connected in series to the hot water supply inlet to stop hot water supply.

Conventional configuration and its problems With conventional hot water storage type water heaters, there is a danger that the remaining hot water will be used up during hot water supply and water will suddenly come out, or that the unexpected high temperature water will come out at the beginning of the shower, causing burns. There was sex.

In order to deal with these problems, it may be possible to display the remaining hot water in the hot water storage tank and the hot water temperature, but it is common for people to hardly see it while the hot water is being used, so it is not a good idea to use it as a guide before using the hot water. Only.

Purpose of the Invention In view of the above-mentioned conventional problems, the present invention constantly monitors the hot water temperature during hot water supply, and when the hot water temperature exceeds the four allowable ranges set by the user, an alarm is issued to notify the user of the hot water supply system. At the same time, it notifies you of the temperature status and closes the electric valve connected to the hot water supply inlet, which may cause burns if the remaining hot water is used up during hot water supply and water suddenly comes out, or if hot water unexpectedly comes out at the beginning of the shower. This is to prevent the risk of causing

Structure of the Invention The basic structure of the present invention to achieve the above object is as follows: a hot water temperature detection sensor for detecting the temperature of hot water provided at a hot water supply port of a water heater; an electric valve connected to the hot water supply port; The system includes a hot water temperature setting section and an abnormal temperature alarm section, and generates an abnormal temperature alarm and simultaneously closes the electric valve when the hot water temperature detected by the hot water temperature detection sensor is out of the hot water temperature setting range. The hot water supply is stopped, and the electric valve is opened for a certain period of time by operating a manual switch provided in the hot water temperature section.

DESCRIPTION OF EMBODIMENTS FIG. 1 shows a water heater according to an embodiment of the present invention. In the figure, 6 is a hot water storage type water heater, 7 is a water supply pipe, 8 is a hot water supply pipe, and an electric valve 11 is provided in the middle of the pipe. 9 is a faucet, 10
1 is a bathtub, 12 is a hot water temperature detection sensor installed near the hot water supply opening, 15 is a hot water temperature setting unit, which sets a setting knob 13 for setting the hot water temperature range, and opens a closed electric valve 11 for a certain period of time. A manual switch 14 is provided.

FIG. 2 shows the circuit configuration. 12 is a hot water temperature detection sensor,
Reference numeral 17 is a volume for setting the hot water temperature range, and both signals are compared by a comparison circuit 18. 19 is a relay driven by the output of the comparison circuit 18; 20 is a switch that opens the electric valve 11 when the temperature of the hot water temperature detection sensor 12 is outside the hot water temperature setting range and the electric valve 11 is closed; The electric valve 11 is activated for a certain period of time by the input signal of 21.
This is a timer circuit that generates a signal to open the circuit.

22 is a power supply circuit that steps down, rectifies, and stabilizes the power supply voltage;
11 is an electric valve, and 24 is a contact point of the relay 19.

The operation in the above configuration will be explained. A hot water temperature detection sensor 12 detects the temperature of hot water stored in a hot water storage type water heater 6. Volume 17 whose temperature sets the hot water temperature range
If the hot water temperature is within the set temperature, the comparator circuit 18 outputs a signal to drive the relay 19 and contacts 2 of the relay 19.
4 switches to a normally open contact, and the electric J↑11 operates in a state 94 to open the hot water pipe and then stops. In this state, if the hot water supply pipe 8 and 19 are opened, hot water can be supplied.

If the remaining hot water is used up and the hot water temperature drops, or if the hot water temperature becomes higher than the set hot water temperature range due to a change in the boiling conditions, the comparator circuit 18 releases the drive of the relay 19 and the contact 24 stays closed. The electric valve 11 is switched to the contact point, and the electric valve 11 is connected to the hot water supply pipe 8.
It operates until it closes and then stops. In this state, hot water cannot be supplied even if the faucet 9 of the hot water supply pipe 8 is opened.

At this time, an alarm is generated from the abnormal temperature alarm section 25 at the same time.

The alarm type changes when the water temperature is within the set temperature range and when it is low and high. When the water temperature is higher than the set temperature range, it is possible to prevent the danger of unexpected high-temperature water coming out at the beginning of hot water supply. You can also confirm that the water temperature is high depending on the type of alarm. However, if this continues, the hot water cannot be used until the hot water temperature falls within the hot water supply setting range. Therefore, in order to enable hot water supply at will, a switch 21 is provided to open the electric valve 11.

When the switch 21 is closed, the timer circuit 20 operates to drive the relay 19 for a certain period of time, enabling hot water supply. After a predetermined time, the relay 19 is deactivated and the hot water supply piping is closed. Opening time of the hot water supply pipe - 〇, set to a time sufficient to supply hot water to the full capacity of the water heater, but shorter than the next boiling time.

By configuring the timer circuit 20 to start by detecting the rise in voltage that occurs when the contact of the switch 21 closes, even if you leave the switch 21 on and forget to turn it off, the timer circuit will start the next day when boiling. Since the circuit 20 is stopped, if the temperature is outside the set temperature range, the hot water supply piping is closed and hot water cannot be supplied, making it possible to prevent the risk of forgetting to turn off the hot water.

Effects of the Invention As described above, according to the present invention, even if a user unconsciously operates the faucet in line with the temperature of the hot water in the hot water storage tank, there is no risk of burns caused by unexpected high-temperature water coming out. Prevention is possible.

Furthermore, it is possible to solve the problem that while hot water is being supplied to the bathtub, the remaining hot water is used up and becomes water halfway, resulting in the hot water in the bathtub not being able to be used entirely for bathing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of an embodiment of the present invention. 11...Electric valve, 12...Hot water temperature detection upper sensor, 25...-Abnormal temperature alarm unit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Scope of Claims] 0) A hot water temperature detection sensor that detects the temperature of hot water provided at a hot water inlet of a water heater, and an electric valve connected to the hot water inlet;
The system includes a hot water temperature setting section and an abnormal temperature alarm section, and generates an abnormal temperature alarm and simultaneously closes the electric valve when the hot water temperature detected by the hot water temperature detection sensor is out of the hot water temperature setting range. A control circuit for a water heater configured to stop hot water supply at the temperature setting section and open the electric valve for a certain period of time by operating a manual switch provided in the temperature setting section. 2) The water heater according to claim 1, wherein the water heater is configured to notify an abnormality by changing the type of alarm depending on whether the water temperature detected by the water temperature detection sensor is higher or lower than the hot water temperature setting. control circuit.