JPH0113260Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a combustion control device for gas appliances such as water heaters and bathtubs, which are equipped with a main burner and a permanent burner.

Conventional gas appliances equipped with a main burner and a constant flame burner, such as a water heater, have a constant flame burner that is lit when the constant flame burner is lit and water is being passed through, since the main burner is lit. The burners will not blow out, but when the water flow is stopped, the main burner will be extinguished and only the permanent burners will be lit, so the permanent burners may blow out due to wind, etc. If this blow-out condition is left unchecked, raw gas will be released, which is dangerous. In order to eliminate this danger, the inventors of this application, etc., during development,
A flame detection circuit detects a blowout, that is, a misfire, of a normally lit burner, and the misfire signal drives an ignition circuit to ignite the normally lit burner again, thereby preventing the release of raw gas after a misfire. I devised a new device that uses a battery as the power source for the ignition circuit, and when the burner is lit, current is always passed through the connection circuit between the battery and the ignition circuit in case the burner misfires. In this case, even during the ignition of the main burner, when there is no risk of a misfire in the normally lit burner, current flows through the connected circuit, causing the inconvenience of consuming the battery.

The purpose of the present invention is to provide a device that eliminates the above-mentioned disadvantages.
An ignition circuit 4 connected to the ignition circuit 4 is provided.
is driven by a misfire signal from a flame detection circuit 5 that detects the flame of the normally lit burner 2, and when an ignition signal is generated from the flame detection circuit 5, the power supply battery 3 and the ignition In the case where a current flows through the circuit 6 connected to the circuit 4,
The present invention is characterized in that a switch 8, which opens in conjunction with the opening operation of the gas valve 7 for the main burner 1, is connected in series to the connection circuit 6.

FIGS. 1 and 2 show an example in which a water heater is used as a gas appliance, and the ignition circuit 4 includes a blocking oscillator 9, a capacitor 10 charged by the output of the blocking oscillator 9, and A Schottley diode 11 that becomes conductive when the charging voltage of the capacitor 10 reaches a predetermined value, an ignition transformer 12 connected in series to the Schockley diode 11 that generates a high voltage, and a high voltage generated from the ignition transformer 12. It consists of discharge electrodes 13, 13 that generate spark discharge in response to voltage, and is connected to the power source battery 3 via an ignition switch 14 which is closed by pressing a push button 24a to the terminal position, which will be described later.

The flame detection circuit 5 has a flame rod 15 facing the permanent burner 2, the flame rod 15 is connected to the base, and the emitter and collector are connected to the base and the base of the transistor 9a of the blocking oscillator 9.
It consists of a transistor 16 connected between its emitters.

Thus, when the ignition switch 14 is closed, no current flows through the flame rod 15 and the transistor 16 is closed during the ignition operation of the normally lit burner 2 and during a misfire.
OFF, the transistor 9a of the blocking oscillator 9 is repeatedly turned ON and OFF to oscillate, a spark discharge is obtained between the discharge electrodes 13, 13, the permanent burner 2 is ignited or re-ignited, and the permanent burner 2 is ignited or re-ignited. During the ignition of No. 2, a current flows through the flame rod 15, turning on the transistor 16, and the transistor 9a of the blocking oscillator 9 remains off, causing no oscillation, and no spark discharge occurs between the discharge electrodes 13, 13.

During the ignition of the normally lit burner 2, a current flows through the connection circuit 6 between the power supply battery 3 and the ignition circuit 4. To explain this in terms of specific components, current from the power supply battery 3 flows through the pass transformer 9b in the ignition circuit 4, the transistor 16 of the flame detection circuit 5, and the flame rod 15.

What has been explained above is not particularly different from what was devised during the development described above.

According to the above configuration, even when the regular burner 2 is lit and the main burner 1 is lit by water passage, current flows through the connection circuit 6 between the power supply battery 3 and the ignition circuit 4; The purpose of flowing the working current is to prepare for a misfire of the permanent burner 2, and it is wasted while the main burner 1 is ignited, where there is no risk of misfire.

In order to eliminate this waste, the present invention is characterized in that a switch 8 that opens in conjunction with the opening of the gas valve 7 for the main burner 1 is connected in series to the connection circuit 6. .

The gas valve 7 shown in the second figure is an automatic valve that is opened in conjunction with the hydraulic response member 17 when water is supplied.

The hydraulic response member 17 is constituted by a known water governor using a diaphragm 18, and an operating rod 17a inserted into the combustion passage 19 is connected to the diaphragm 18.

The automatic valve is attached to the free end of the driving lever 17a, and is normally held in the closed position by a spring 20, against the spring 20 of the operating rod 17a due to the displacement of the diaphragm 18 during water flow. The valve is held in the open position by moving the valve.

A lever 17b is provided in the middle of the operating rod 17a in a direction perpendicular to its longitudinal direction, and a micro switch is pressed by the tip and closed when no water is flowing to a position opposite to the tip of the lever 17b. The switch 8 consisting of the following is provided.

In the second figure, reference numerals 21, 22, and 23 indicate a shutoff valve, a safety valve, and an ignition valve, which are opened by a manual operation member 24, respectively.

The manual operation member 24 includes a push button 24a inserted into the operation panel 25 on the front side of the water heater, an operation rod 24b coaxially extending rearward with the push button 24a and inserted into the fuel passage 19, and a push button 24b having a play at the rear end. and a lever 24c that is engaged with the lever 24c. The shutoff valve 21 is fixed to the operating rod 24b, and the safety valve 22 is disposed opposite to the operating end of the lever 24c.

Thus, the return spring 2 from the starting end position of the push button 24a
6, the shutoff valve 21 is opened via the operating rod 24b at the intermediate position, and then the safety valve 22 is opened via the lever 24c at the terminal position in sequence. I made it possible to do so. Furthermore, the second
In the illustrated example, the operating rod 24 of the fuel passage 19
An ignition passage 28 connected to an ignition burner 27 arranged in parallel with the always-fired burner 2 was opened in the insertion wall part b.

The ignition valve 23 is attached to the operating rod 24b and the push button 24
Connect the ignition passage 28 to the fuel passage 19 at the terminal position of
It consists of a small diameter section that is operated to communicate with the

Thus, when the push button 24a is pressed to the terminal position, the light is transmitted to the normally lit burner 2 via the cutoff valve 21 and the safety valve 22, and to the ignition burner 27 via the ignition valve 23. Gas was supplied to each.

The push button 24a closes the ignition switch 14 when pressed to the end position, and when the push button 24a is released from the end position, the claw piece 2 engages with a protrusion 42 formed thereon.
9, the return operation is stopped at the intermediate position, and the claw piece 29 is pressed by pressing the separately provided fire extinguishing button 30.
It is now possible to return to the starting position by releasing the engagement.

In the control circuit of FIG. 1, the ignition circuit 4 is driven in addition to the ignition circuit 4 which is connected to the power supply battery 3 via the ignition switch 14 which is closed in its terminal position in conjunction with the push button 24a. After ignition is applied to the normally lit burner 2 via the ignition burner 27, it is heated by the normally lit burner 2, and after a certain period of time, a predetermined electromotive force is generated to excite the solenoid 31 of the safety valve 22. The electric charge charged by the power supply battery 3 is discharged through a thermocouple 32 that attracts and holds the safety valve 22 in an open state, and a changeover switch 33 that switches to the solenoid 31 side when the push button 24a is pressed beyond the intermediate position. A capacitor 34 is provided to energize the solenoid 31 and hold the safety valve 22 open for the predetermined period of time.

In FIG. 2, 35 indicates a heat exchanger of a water heater.

Next, to explain the operation, when the push button 24a is pressed, the cutoff valve 21 opens at the intermediate position, and then the safety valve 22 and the ignition valve 23 open at the terminal position, and the ignition switch 14 closes. The constant ignition circuit 4 is activated to provide ignition of the normally lit burner 2 via the ignition burner 27. After ignition, the push button 24a is released; at this time, the push button 24a
is restrained at an intermediate position, the capacitor 34 is discharged, and the safety valve 22 is kept open for a certain period of time, and after a certain period of time, the safety valve 22 is kept open by a predetermined electromotive force of the thermocouple 32, and a constant fire occurs. Ignition of burner 2 continues.

During the ignition of the normally lit burner 2 up to this point, current flows through the connection circuit 6 between the power supply battery 3 and the ignition circuit 4 in case of a misfire. When water is subsequently passed through, the automatic valve that constitutes the gas valve 7 is opened, and the main burner 1 is ignited via the normally lit burner 2, and the switch 8 is opened and the power source battery 3 is turned on. It is disconnected from the ignition circuit 4, and consumption of the power battery 3 is prevented.

In the one shown in the second figure, the gas valve 7 is configured as an automatic valve that is opened in conjunction with the hydraulic response member 17 when water flows through it, but the invention is not limited to this. For example, as shown in the third figure, a gas appliance When used as a bath kettle,
The gas valve 7 may be a manual valve that is opened in conjunction with the setting operation of the fire extinguishing timer 36.

To explain this specifically, the extinguishing timer 36
A cam 37 is fixed to the shaft 36a, one end of a push rod 38 is brought into contact with the cam 37, and the manual valve, which is normally held in the closed position by a spring 39, is attached to the other end of the push rod 38. .

Further, a lever 40 is provided at the intermediate portion of the push rod 38 in a direction perpendicular to its longitudinal direction, and a normally closed micro switch constituting the switch 8 is provided opposite the tip thereof.

Thus, when the extinguishing timer 36 is set after the constant flame burner 2 is ignited, the push rod 38 is moved against the spring 39, the manual valve is opened, and the main burner 1 is ignited. The switch 8 is opened to disconnect the power battery 3 from the ignition circuit 4, thereby preventing the power battery 3 from being exhausted.

41 in FIG. 3 indicates a heat exchanger for the bathtub.

In this way, according to the present invention, the ignition circuit 4 connected to the power source battery 3 is driven by a misfire signal from the flame detection circuit 5 that detects the flame of the normally lit burner 2, and the ignition circuit 4 connected to the power source battery 3 is The ignition circuit 4
A switch 8, which opens in conjunction with the opening operation of the gas valve 7 for the main burner 1, is connected in series to the connection circuit 6, so that when the normally lit burner 2 misfires, the ignition circuit 4 is driven to re-ignite it. In the case where the power source battery 3 can be disconnected from the ignition circuit 4 during the ignition of the main burner 1 without causing the normally lit burner 2 to blow out, the power source battery 3 can be disconnected from the ignition circuit 4. It has the effect of suppressing the consumption of 3 as much as possible.

[Brief explanation of the drawing]

Fig. 1 is a control circuit diagram showing one example of the implementation of the device of the present invention, Fig. 2 is a cutaway side view of mechanical parts related to the control circuit of Fig. 1, and Fig. 3 is another embodiment of the device of the present invention. FIG. 1...Main burner, 2...Permanent burner, 3...
...Power battery, 4...Ignition circuit, 5...Flame detection circuit, 6...Connection circuit, 7...Gas valve, 8...Switch.

Claims (1)

[Scope of utility model registration request] A gas appliance equipped with a main burner 1 and a constant flame burner 2 is provided with an ignition circuit 4 connected to a power source battery 3, and the ignition circuit 4 is connected to a fire detection circuit 5 that detects the flame of the constant flame burner 2. In addition to being driven by a misfire signal, when an ignition signal is generated from the fire detection circuit 5, a current flows through the connection circuit 6 between the power supply battery 3 and the ignition circuit 4. A combustion control device for a gas appliance, characterized in that a switch 8, which opens in conjunction with the opening operation of the gas valve 7 for the main burner 1, is connected in series to the connection circuit 6.