JPH0432297B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a water heater that electrically controls hot water supply.

BACKGROUND ART A conventional water heater was constructed as shown in FIG. That is, in FIG. 4, water supplied from a water supply 1 enters a tank 3 of an electric water heater 2, is heated by a heater 4, and is stored. Hot water is supplied to the supply taps 5 and 6 provided at the ends via a hot water supply pipe 7 connected to the electric water heater 2.

Hot water supply is supplied and stopped by opening and closing the tap 8 or 9 of the hot water tap 5 or 6.

Problems to be Solved by the Invention However, in this conventional water heater, the hot water taps 5 and 6 had to be opened and closed by the user directly. It is impossible to change the hot water supply mode,
If a leak were to occur in the electric water heater 2, there was a risk of electric shock from the hot water taps 8 and 9.

The present invention is intended to solve these conventional problems, and aims to provide a water heater that is easy to use and takes safety measures.

Means for Solving the Problems In order to solve the above problems, the water heater of the present invention includes a hot water supply pipe, a mixing valve that mixes hot water and water supplied through the water supply pipe and adjusts the hot water temperature, and a mixing valve that mixes hot water and water supplied through the water supply pipe. A mixing hot water pipe that supplies hot water whose temperature is controlled by An electrically driven on-off valve that supplies and stops the mixed hot water installed in the hot water supply, a hot water switch installed near the hot water supply inlet, a control circuit that controls the on-off valve according to instructions from the hot water supply switch, and an on-off valve that controls the on-off valve according to instructions from the hot water supply switch. It is constructed by providing an emergency stop water stop valve provided in series and a flow rate detector provided in the mixing hot water pipe for detecting the closed state of the emergency stop water stop valve. In addition, the control circuit determines and detects that the flow rate detector cannot be obtained even if the hot water supply switch is instructed to open when the emergency stop water stop valve is closed. It is.

Effect With the above-described configuration, the water heater of the present invention controls the on-off valve according to instructions from the hot water supply switch, and safely starts and stops hot water supply with a light operation of the electric switch, without directly manually operating the on-off valve. In addition, in the unlikely event that an on-off valve fails, a water shutoff valve for emergency stop is opened and closed, and when the water shutoff valve is closed, a flow rate detector detects the closure. Further, the closed state is detected using the signal from the flow rate detector, and the signal is also used for other flow rate control.

Embodiment Next, an embodiment of the present invention will be described based on FIGS. 1 to 3.

In FIG. 1, water is supplied from a water supply 11 through a check valve 12 and a pressure reducing valve 13 into a tank 15 in an electric water heater 14, which is a hot water supply source, and is heated by a heater 16 to raise its temperature. stored within.
The hot water produced by the electric water heater 14 is supplied to the manual hot water tap 17 on the terminal side or the hot water tap 1 which is an emergency stop valve.
A hot water supply pipe 19 is provided at 8 as a hot water supply route for supplying lead hot water. An air vent valve 21 of a safety valve 20 is connected to the hot water supply pipe 19 near the electric water heater 14 . A mixing valve 2 is located near the hot water tap 18.
2 is provided, the water in the water supply pipe 23 and the hot water supply pipe 19 is mixed with the hot water, and the mixed hot water is supplied to the hot water tap 1 through the mixing pipe 19'. In this mixing hot water pipe 19',
An electric two-way valve 24 that is an on-off valve that supplies and stops the supply of mixed hot water to the hot water tap 18 is provided. Since the electric two-way valve 24 is provided after the mixing valve 22, it is not directly exposed to temperature, making it advantageous in terms of durability.

This electric two-way valve 24 is controlled via a control device 26 according to the settings of a setting device 25. A flow rate sensor 27 is also provided in the mixing hot water pipe 19' as a component of an automatic hot water supply stop circuit that constitutes a part of the control device 26.

Further, 28 and 29 are the taps for the hot water taps 17 and 18. Details of the setting device 25 are shown in FIG. In this embodiment, the setting device 25 is capable of setting both intermittent hot water supply and automatic stop of hot water supply. Mode selection is performed by an automatic hot water supply stop switch 30 and an intermittent hot water supply switch 31. When only intermittent hot water supply is selected, the intermittent hot water supply switch 31 is turned off, and the hot water supply automatic stop switch 30 is turned off. Then, by setting the opening time setting knob 32 and the closing time setting knob 33 of the electric two-way valve 24, it is set to "open".
The "close" time is controlled. In this case, the opening time setting knob 32 and the closing time setting knob 33 are variable so that the opening time and closing time can be set arbitrarily, and the hot water supply and stop times can be adjusted and set. Further, 35 is a hot water supply amount setting knob, and if the desired total amount of hot water is set in advance, the electric two-way valve 24 is automatically closed after a predetermined amount of hot water has been supplied, and the hot water supply is automatically stopped.
In this case, the amount of hot water supplied is displayed 34. To select automatic hot water supply stop, it is necessary to turn on the hot water supply automatic stop switch 30. Intermittent hot water supply and automatic stop of hot water supply can be selected individually, or both can be used in combination. FIG. 3 shows an example of an electric control circuit for intermittent hot water supply. The circuit consists of an AC power supply 35, a transformer 36, a rectifier 37, an on-time time limit circuit 38, an off-time time limit circuit 39, a relay 40, a contact 41, an electric two-way valve 24, and an intermittent water supply switch 31. According to the settings of the setter 25, the on time time limit circuit 38 and the off time time limit circuit 39 operate to set and reset the relay 40. The contact 41 is switched by the relay 40 to control the position of the electric two-way valve 24 to repeatedly open and close the hot water supply path. Note that when the intermittent hot water supply switch 31 is turned off, the on time limit control circuit 38 and the off time limit control circuit 39 are reset.

Of course, regular participation using the electric two-way valve 24 other than the intermittent hot water supply or automatic stop hot water supply as described above is also possible.
In this case, by operating the opening time setting knob 32 to set a longer opening time and shortening the closing time setting knob 33 to zero, hot water can be supplied and stopped by turning the intermittent hot water supply switch 31 on and off.

Furthermore, the function of the flow rate sensor 27 is that of the electric two-way valve 2.
In addition to adjusting the amount of hot water supplied by step 4 and integrating the amount of hot water supplied in automatic hot water supply stop mode, when the electric two-way valve 24 malfunctions and a flow rate signal is obtained even though hot water supply is supposed to be stopped, a warning is issued, and the hot water tap It is also used to detect that the flow has stopped when the valve 18 is closed and to stop the control.

Next, the operation will be explained. First, when only intermittent hot water supply is desired, the automatic hot water supply stop switch 30 is turned off and the intermittent hot water supply switch 31 is turned on. Then, the opening time and closing time of the electric two-way valve 24 are set using the opening time setting knob 32 and the closing time setting knob 33. Under the condition that the hot water tap 18 is open, intermittent hot water supply is performed according to the settings. Also, for example, the opening time setting knob 32 may be turned on for a short time (for example, 5
If you set the closing time setting knob 33 to a very long time (for example, 1 hour) and turn on the intermittent hot water supply switch 31, hot water will be supplied for 5 seconds and then automatically stopped. hot water switch 31
It is also possible to automatically supply a predetermined amount or small amount of hot water and automatically stop the operation. In addition, for example, by setting the closing time setting knob 33 to a long time (for example, 5 hours) and setting the opening time setting knob 32 to a long time, it is possible to set the closing time setting knob 33 to a long time (for example, 5 hours), so that freezing may occur at night in winter. It is also possible that the hot water is stopped until dawn, and then the electric two-way valve 24 is opened to allow a small amount of hot water to flow until morning. At this time, the temperature is regulated by the mixing valve 22, which is more economical than the method of trickling hot water, and has the advantage of reliably preventing freezing even in extremely cold weather, compared to the method of trickling water. have.

During hot water supply, the electric two-way valve 24 can also adjust the flow rate using the signal from the flow rate sensor 27. Furthermore, by setting the open time setting knob 32 to a very long time and the closing time setting knob 33 to zero, and operating the intermittent hot water supply switch 31, hot water supply can be started and stopped in conjunction with the switch operation.

Next, if you only want to automatically stop the hot water supply, set the hot water supply amount predetermined knob 35 to the desired amount of hot water, turn on only the automatic hot water supply stop switch 30, the electric two-way valve 24 will be opened, and hot water supply will start. The flow rate sensor 27 detects the water flow rate, the control device 26 integrates the flow rate, and when hot water reaches the set amount, the electric two-way valve 2
Issues a command to close 4 and automatically stops hot water supply. Kotuku 29 basically supplies hot water even without it,
It can be stopped, but in this case, the electric two-way valve 24
It is provided for manual closing when the system fails or cannot be closed due to a power outage. Normally, it is left open and not operated.
In particular, when the electric water heater 14 is out of order and there is a current leak, the probability of a person touching the hot water tap 18 and getting an electric shock can be reduced.

Furthermore, if the hot water tap is closed by mistake even in normal conditions, it is determined that no signal from the flow rate sensor 27 can be obtained even if the electric two-way valve 24 is opened, and this is displayed on the display 34. If you want to use both intermittent hot water supply and automatic hot water supply stop, turn on both the intermittent hot water supply switch 31 and the hot water supply automatic stop switch 30, set the time,
By setting the amount of hot water, it is possible to use them together. If both switches are turned off, normal hot water supply can be performed by operating only the pot 29.

In addition, in the above embodiment, the hot water tap 1, which is a water stop valve,
8 was provided after the mixing valve 22, but the mixing valve 22
It may be provided in the hot water supply pipe 19 and the water supply pipe 23, respectively, on the upstream side of the water supply pipe 19 and the water supply pipe 23.

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

(1) The on-off valve is electrically driven by the operation of the hot water switch to supply and stop mixed hot water, making operation light and easy, and various automatic operations using electrical control possible. Furthermore, even if a leak occurs in the water heater, the probability of touching the hot water tap directly with your hands is extremely low, making it safer. Furthermore, even if the on-off valve malfunctions, the water can be shut off using the emergency stop valve, so hot water will not be wasted, and even if the water is shut off due to an emergency stop or incorrect operation, the flow rate detector will still work. This allows the user to know its status and use it without any confusion.

(2) By providing a flow rate detector and using this signal for control, in addition to detecting the closure of the emergency stop valve, various controls such as flow rate control and flow rate integration become possible.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention;
Figure 2 is an external view showing the setting device of the system, Figure 3
The figure is a circuit diagram showing a control device of the system, and FIG. 4 is a system diagram showing a conventional water heater. 18... Hot water tap (water stop valve for emergency stop), 19...
...Hot water pipe, 23...Water supply pipe, 19'...Mixing hot water pipe,
22... Mixing valve, 24... Electric two-way valve (open/close valve), 25... Setting device, 26... Control device (control circuit), 27... Flow rate sensor (flow rate detector), 31
...Intermittent hot water supply switch (hot water supply switch).

Claims (1)

[Scope of Claims] 1. A hot water supply pipe, a mixing valve that mixes hot water and water supplied via the water supply pipe and adjusts the hot water temperature, a mixing pipe that supplies hot water whose temperature has been adjusted by the mixing valve, and A hot water supply port installed at the end of the mixing hot water pipe to supply temperature-controlled hot water to the hot water supply target, and an electric outlet installed in the mixing hot water pipe downstream of the mixing valve to supply and stop the temperature-controlled hot water. a hot water supply switch provided near the hot water supply inlet that instructs to start and stop hot water supply; a control circuit that controls the opening and closing valve according to instructions from the hot water supply switch; A water heater comprising: an emergency stop water stop valve provided in series with the emergency stop water stop valve; and a flow rate detector provided on the mixing hot water pipe for detecting a closed state when the emergency stop water stop valve is closed. 2 A patent that uses a flow rate detector that detects the amount of hot water to be supplied, and when the emergency stop water stop valve is closed, a control circuit determines that a flow rate signal is not obtained even if the hot water switch is instructed to open it, and issues a notification. A water heater according to claim 1.