JPH0411762B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a closed-valve-energized fuel cutoff valve that opens and closes the fuel supply to a burner, and a water shutoff valve that opens and closes the water supply to a heat exchanger for water heating. a valve, a circuit for initially holding the valve open to excite the solenoid of the fuel cutoff valve to the valve open side for a predetermined period of time using power supplied from a constant power source, and a thermoelectromotive force of the thermoelectric element generated by heating the burner to cut off the fuel. A safety circuit that energizes the solenoid of the valve to the valve opening side, an operating tool that instructs switching between a hot water supply state and a hot water supply stop state, and a hot water temperature adjustment operating tool that adjusts the hot water supply temperature are provided, and the operating operating tool As the water supply is switched from a hot water supply stop state to a hot water supply state, the initial valve opening holding circuit, the safety circuit, and the ignition device are operated, and the water valve is opened, and
The present invention relates to a water heater configured to close the fuel cutoff valve and the water valve when the operating tool is switched from a hot water supply state to a hot water supply stop state.

[Conventional technology]

In the above-mentioned water heater, the following is conventionally known as a configuration for interrupting hot water supply to obtain water (no literature can be cited).

[1] After turning off the operating device to extinguish the water and turning off the water, the hot water temperature adjustment device is moved to the water position, allowing only the water valve to open and water to be supplied.

[2] By operating the hot water temperature adjustment tool to the water position,
The fuel supply control valve is throttled down until it closes to extinguish the burner and allow water to be supplied.

[Problem that the invention seeks to solve]

However, the water heater described above had the following problems.

First, in the case of configuration [1], in order to be able to supply water from the ignition water flow state, that is, from the hot water supply state,
Two for the operation operation tool and the hot water temperature adjustment operation tool,
In addition, sequential operations are required, resulting in poor operability.

On the other hand, in the case of configuration [2], although the fuel supply amount control valve can open and close the fuel supply path, due to its original structure as a control valve, even when the valve is throttled until closed, the fuel Leaks are likely to occur.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a water heater that can obtain water during hot water supply with a simple operation and that can also safely obtain water.

[Means for solving problems]

A characteristic configuration of the water heater according to the present invention is such that a valve closing circuit that excites the solenoid of the fuel cutoff valve to the valve closing side with electric power obtained by inverting the polarity of the electric power supplied from the constant power source, and a valve closing circuit that excites the solenoid of the fuel cutoff valve to the valve closing side, The device is configured to be activated when the device is moved to a predetermined position.

[Effect]

In the hot water supply state, the water valve and fuel cutoff valve are open. Here, when the hot water temperature adjustment tool is operated to the predetermined position for water supply, the valve closing circuit is activated and the solenoid of the fuel cutoff valve is energized to the valve closing side. Therefore, it cancels out the excitation to the valve opening side by the safety circuit. As a result, the fuel cutoff valve is closed due to the urging force toward the valve closing side.

As a result, water can be supplied while the operation tool remains in the hot water supply state.

〔Effect of the invention〕

As a result, while maintaining the previous function that allows you to easily turn on and off hot water by operating the operation tool that also serves as the hot water supply start/stop function, the new function allows you to easily turn hot water on and off with a single operation from the hot water supply state. By completely cutting off the fuel supply to the tank, water can now be obtained without the risk of fuel leakage or flashback.

Moreover, by using the conventional configuration for maintaining the initial valve opening, it is possible to avoid complicating the configuration such as complicating the electric circuit and installing a new water flow path. Overall, it was possible to obtain a water heater that has both an easy-to-operate hot water supply function and a safe water supply function, which is advantageous in terms of manufacturing and cost.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, a burner 2 and a heat exchanger 3 for heating water are installed inside a casing 1, and a water supply channel 4 is connected to the water inlet of the heat exchanger 3. A hot water outlet 5 is extended from the discharge portion of 3 to constitute an instantaneous water heater, which is an example of a water heater.

The water supply channel 4 is provided with a faucet 6 as a water valve and a water flow control valve 7. Further, the fuel supply path 8 to the burner 2 is provided with a source gas valve 9, a fuel cutoff valve 10 as a safety valve, and a fuel supply amount control valve 11.

The fuel cutoff valve 10 is biased to self-close to close the fuel supply path 8 by a built-in spring. Further, two types of solenoids 12A and 12B are provided to maintain the fuel cutoff valve 10 in an open state against this self-closing biasing force.

One first solenoid 12A is connected to a built-in battery 15, which is a constant power source, via a timer circuit 14, and constitutes an initial valve opening holding circuit 16. That is, the timer circuit 14 supplies power from the built-in battery 15 to the first solenoid 12A to excite it for a predetermined period of time from the time when it is switched to the ignition/water flow state by an operating tool to be described later, and operates the fuel cutoff valve. 10
The valve is configured to maintain the valve in the open state against the self-closing force.

Further, a thermocouple 17, which is a thermoelectric element provided near the burner 2, is connected to the other second solenoid 12B. The second solenoid 12B is configured to be excited by the electromotive force generated from the thermocouple 17 when the burner 2 is heated.

In a normal combustion state, the thermoelectromotive force of the thermocouple 17 is sufficiently large, and the magnetic force of the second solenoid 12B excited by this thermoelectromotive force causes the fuel cutoff valve 10 to resist the self-closing force. It is configured such that the valve is maintained in the open state.

On the other hand, if an abnormality such as a power out occurs, the thermoelectromotive force of the thermocouple 17 decreases, so the magnetic force of the second solenoid 12B decreases, and the fuel cutoff valve 10 supplies fuel by the self-closing force. It is configured to block the passageway 8.

By closing the fuel cutoff valve 10, the fuel supply to the burner 2 is cut off and combustion is stopped. That is,
Thermocouple 17 serves as an abnormality detection sensor UD,
A safety circuit 18 connecting this thermocouple 17 with the second solenoid 12B outputs the decrease in thermoelectromotive force, which is an abnormality detection signal from the thermocouple 17, as a cutoff signal that closes the fuel cutoff valve 10. It constitutes a safety control device.

In this instantaneous water heater, the above-mentioned initial valve opening holding circuit 16 is provided with polarity inversion for supplying the power supplied from the built-in battery 15, which is a constant power source, to the first solenoid 12A. A circuit 19A is provided.

When this polarity inversion circuit 19A is operated to invert the polarity of the power supplied from the built-in battery 15 and supply it to the first solenoid 12A, the magnetic force of the first solenoid 12A excited by this supplied power and the thermocouple The magnetic force of the second solenoid 12B excited by the thermoelectromotive force of the fuel cutoff valve 17 cancels each other out, and the self-closing force of the fuel cutoff valve 10 becomes larger than the magnetic force for holding the valve open, which resists the self-closing force of the fuel cutoff valve 10. 10
is operated to close the valve. As a result, the fuel supply to the burner 2 is cut off, combustion is stopped, and unheated water can be obtained from the heat exchanger 3 via the outlet path 5.

This polarity inversion circuit 19A is connected to the water supply switch 19.
It is connected to B. And this water supply switch 1
9B is open when hot water is being dispensed, and switches the state of the polarity reversing circuit 19A to a state where the power supplied from the built-in battery 15 is directly supplied to the first solenoid 12A. On the other hand, when water is needed, this water supply By closing the switch 19B, the polarity reversing circuit 9A changes the polarity of the power supplied from the built-in battery 15 and supplies it to the first solenoid 12A.
As described above, the fuel cutoff valve 10 is closed.

That is, the polarity inversion circuit 19A and the water supply switch 19
B constitutes a valve closing circuit 19.

As shown in FIG. 2, this water supply switch 19B is provided at the moving end on the left side in the figure of the hot water temperature adjustment operating tool 21 that can freely slide in the left and right directions in the figure along the rail 20. It is configured to be closed upon contact with the operating tool 21.

The hot water temperature adjustment tool 21 has a pair of rack parts 21.
a, 21b are attached, and these pair of rack parts 21a, 21b are connected to a water amount adjustment gear 22 interlocked with the water amount adjustment valve 7 and a fuel supply amount adjustment valve 11.
The fuel supply amount adjusting gears 23 are respectively engaged with the gears 23 for adjusting the amount of fuel supplied.

By sliding the hot water temperature adjusting tool 21 to the right in the figure, hot water can be obtained, and by sliding the hot water temperature adjusting tool 21 to the left in the figure, a low temperature can be obtained. In order to obtain hot water of
By bringing it into contact with the water supply switch 19B, the water supply switch 19B is closed and water is obtained as described above.

That is, by using the conventional hot water temperature adjusting operation tool 21 for adjusting the hot water temperature, the predetermined position for water supply (in this embodiment, the left moving end in FIG. 2) is used.
By operating the water supply operation means 19 for closing the fuel cutoff valve 10 by operating the fuel cutoff valve 10, the water supply function can be obtained without providing a special new operation tool. There is.

As shown in FIG. 3, on the front side of the casing 1 are the above-mentioned hot water temperature adjustment tool 21 and the ignition/
A push button 24, which is an operating tool H, is provided to switch between a water flow state and a fire extinguishing/water cutoff state.

When the push button 24 is pushed from the most protruding starting end position to the farthest end position, and then released, it returns to an intermediate position between the starting end and the ending end, and is self-retained at that position. It is configured to self-return to the starting position when it is self-held at the position and then pushed again to the terminal position and then released.

The operation using the push button 24 is performed as follows.

(a) When the push button 24 is pushed from the starting position to the final position, the water faucet 6, fuel cutoff valve 10, and source gas valve 9 are all opened in mechanically interlocked fashion. At the same time, the timer circuit 14 starts operating and power supply from the built-in battery 15 to the first solenoid 12 is started, and the supplied power forces the fuel cutoff valve 10 to open against the self-closing force. and the ignition device (not shown) is activated.

The timer circuit 14 keeps the fuel cutoff valve 10 forcibly open and the ignition device ignited by the power supplied from the built-in battery 15 for a predetermined period of time (e.g. It is designed to continue automatically for about 5 seconds). This eliminates the need to keep pressing the push button 24 until the electromotive force of the thermocouple 17 becomes sufficient to keep the fuel cutoff valve 10 open, and also prevents the burner 2 from igniting incorrectly. It is set as.

(b) When the push button 24 returns from the end position to the intermediate position and is self-held at that position, the water faucet 6 is maintained in the open state, and the fuel cutoff valve 10 is turned off after the above-mentioned predetermined time has elapsed. The valve is held open by the thermoelectromotive force of pair 17.

Therefore, the hot water supply operation continues with the push button 24 self-maintained at the intermediate position. In this state, the temperature of the hot water obtained can be changed by sliding the hot water temperature adjustment tool 21 left and right in the figure.

Furthermore, by sliding the hot water temperature adjusting tool 21 to the left moving end, it is possible to stop the combustion of the burner 2 as described above and obtain water. Water supply operation continues in the holding state.

(c) Regardless of whether the operation is hot water supply operation or water supply operation, if the push button 24, which is self-held at the intermediate position, is pushed again to the terminal position and returned to the starting position, the Mechanically interlocking, the faucet 6 and the source gas valve 9 are closed to stop supplying hot water or water.

In the case of water supply operation, as mentioned above, the fuel cutoff valve 10 is closed at the same time as the water supply switch 19B is closed.
The valve is closed, but in hot water supply operation,
In conjunction with this self-return of the push button 24 to the starting position, the source gas valve 9 is closed, and the burner 2
As the thermoelectromotive force of the thermocouple 17 decreases as the fuel is extinguished, the fuel cutoff valve 10 closes due to its self-closing force.

[Another example]

Next, another example will be listed.

<1> As shown in FIG. 4, one solenoid 12 serves as the two types of solenoids 12A and 12B of the fuel cutoff valve 10. A circuit 16 for maintaining an initial valve opening and a safety circuit 18 are connected to the solenoid 12 in parallel.

Therefore, when the power supplied from the built-in battery 15 is reversed by operating the water supply operating means 19, this supplied power and the thermoelectromotive force of the thermocouple 17 cancel each other out, and the excitation power to the solenoid 12 is reduced. Since the fuel cutoff valve 10 is small, the fuel cutoff valve 10 is closed by its self-closing force.

Since the other configurations are the same as those in the previous embodiment, the same numbers will only be assigned and detailed explanations will be omitted.

In addition, in this configuration, a faucet 6 as a water valve may be interposed in the hot water outlet path 5.

Incidentally, although reference numerals are written in the claims section for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

1 to 3 show an embodiment of a water heater according to the present invention, and FIG. 1 is a schematic configuration diagram of an instantaneous water heater;
FIG. 2 is a schematic diagram of the internal structure of the hot water temperature adjustment tool, and FIG. 3 is a diagram of the instantaneous water heater. FIG. 4 is a schematic configuration diagram corresponding to FIG. 1 showing another embodiment. 2...Burner, 3...Heat exchanger, 6...Water valve,
8...Fuel supply path, 10...Fuel cutoff valve, 12
A, 12B... Solenoid, 15... Constant power supply, 1
6... Initial valve opening holding circuit, 17... Thermoelectric element,
18... Safety circuit, 19... Valve closing circuit, 21...
...Hot water temperature adjustment tool, H...Driving control tool.

Claims (1)

[Scope of Claims] 1. A close-activated fuel cutoff valve 10 that opens and closes the fuel supply to the burner 2, a water valve 6 that opens and closes the water supply to the heat exchanger 3 for water heating, and the fuel cutoff valve. 1
0 solenoid 12A is energized to the valve open side for a predetermined period of time by power supplied from a constant power supply 15, and the fuel cutoff valve is activated by the thermoelectromotive force of the thermoelectric element 17 generated by the heating of the burner 2. a safety circuit 18 that excites the 10 solenoid 12B to the valve opening side;
An operating tool H that instructs switching between a hot water supply state and a hot water supply stop state, and a hot water temperature adjustment operating tool 21 that adjusts the hot water temperature are provided, and when the operating tool H is switched from a hot water supply stop state to a hot water supply state. Accordingly, the initial valve opening holding circuit 16, the safety circuit 18, and the ignition device are activated, the water valve 6 is opened, and the operating tool H is switched from the hot water supply state to the hot water supply stop state. Therefore, in a water heater configured to close the fuel cutoff valve 10 and the water valve 6, the solenoid 12A of the fuel cutoff valve 10 is turned to the closing side using electric power obtained by reversing the polarity of the electric power supplied from the constant power source 15. A water heater in which a valve-closing circuit 19 that is energized is activated when the hot water temperature adjustment operating tool 21 is operated to a predetermined position for water supply.