JPH0330053B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a combustion control device equipped with a thermoelectric element that maintains a manually opened electromagnetic safety valve in an open state.

(Prior Art) Conventional devices of this type include an electromagnetic safety valve that is interposed in a gas supply path to a burner and opens in conjunction with the ignition operation, an ignition circuit that operates in conjunction with the ignition operation, and the electromagnetic safety valve. It is known to include a thermoelectric element connected to the coil of the burner and heated by the burner.

(Problems to be Solved by the Invention) However, in the conventional device described above, the electromagnetic safety valve is opened by the ignition operation, gas is supplied to the burner, and the ignition circuit is activated to ignite the burner, and then the gas is generated from the thermoelectric element. The electromagnetic safety valve is held open by a predetermined electromotive force to continue combustion in the burner, and the combustor is started to be used (hereinafter referred to as a "cold start").
In this case, if the burner is not ignited by the ignition operation, the thermoelectric element will not be heated and the specified electromotive force will not be generated, so there is no problem, but if you stop using the combustor,
When the burner is immediately reused (hereinafter referred to as a "hot start"), the ignition operation is instantaneous, so even if the spark from the ignition circuit is not sufficient and the burner is not ignited, the thermoelectric element Since the electromagnetic safety valve continues to generate a predetermined electromotive force due to residual heat, the electromagnetic safety valve is kept open, causing the dangerous release of raw gas.

(Means for Solving the Problems) The present invention aims to provide a device capable of eliminating the above-mentioned dangerous state of the burner, which is installed in the gas supply path to the burner and is used for ignition operation. A device comprising an electromagnetic safety valve that opens in conjunction with the valve, an ignition circuit that operates in conjunction with the ignition operation, and a thermoelectric element connected to the coil of the electromagnetic safety valve and heated by the burner, which is activated when the ignition operation is released. The present invention is characterized in that a timer circuit is provided to continue the operation of the ignition circuit for a predetermined period of time necessary for igniting the burner.

(Function) The present invention has the above configuration. According to this, the electromagnetic safety valve is opened by the ignition operation, gas is supplied to the burner and the ignition circuit is activated, and the timer circuit is activated for a predetermined time by the release of the ignition operation. The ignition circuit continues to operate for a predetermined period of time.

If the above ignition operation is during a cold start,
When the burner is ignited by the ignition operation and the operation continues for a period of time until a predetermined electromotive force is generated from the thermoelectric element, the electromagnetic safety valve is maintained in an open state even if the ignition operation is subsequently canceled. If normal combustion of the burner continues and the ignition operation is canceled before the specified electromotive force is generated from the thermoelectric element, the electromagnetic safety valve will remain open regardless of whether the burner ignites. First, when the burner is ignited, the combustion of the burner is immediately stopped, and when the burner is not ignited, the burner is maintained in a stopped state from the beginning, which is safe.

If the above ignition operation is a hot start,
The thermoelectric element is in a state where a predetermined electromotive force is generated by the remaining heat, and the electromagnetic safety valve is kept open, so when the burner is ignited by the ignition operation, normal combustion of the burner continues, and Even when the ignition operation is canceled before the burner ignites, the operation of the timer circuit continues for a predetermined time after the ignition operation is canceled, and within this predetermined time, the burner is reliably ignited and combustion of the burner starts.

Therefore, during a hot start, the ignition operation is performed and the ignition operation is immediately released, so even if the burner does not ignite during the ignition operation, the burner combustion will surely start after that and raw gas will be released. It is safe and will not be damaged.

(Example) Next, an example of the present invention will be described based on the drawings.

In FIG. 1, reference numeral 1 indicates a manually opened electromagnetic safety valve installed in a gas supply path 3 to a burner 2, and a coil 4 of the electromagnetic safety valve 1 is connected to a thermocouple 5, which is a thermoelectric element heated by the burner 2. Connected.

Reference numeral 6 indicates an ignition circuit connected to the battery 7, and the ignition circuit 6 includes a discharging circuit 10 consisting of a capacitor 8 and a resistor 9 with a small resistance value, and a charging circuit 12 consisting of the capacitor 8 and a resistor 11 with a large resistance value. It incorporates a timer circuit 13 with
directly supplies power from the oscillator circuit 15 to the oscillation circuit 15, operates it to generate a high voltage on the secondary side of the ignition transformer 16, and applies this high voltage to the ignition electrode 17 to generate a spark between the electrodes. Also, the release switch 18, which opens when the ignition operation is released, charges the capacitor 8 for a predetermined period of time, and during this predetermined period, the oscillation circuit 15 is operated to generate a spark between the electrodes in the same way as when the ignition switch 14 is used. The structure was designed to allow

If the above ignition operation is for a cold start, the ignition operation opens the electromagnetic safety valve 1, gas is supplied to the burner 2, and the ignition switch 14 is opened.
is closed, the capacitor 8 is charged, and the ignition circuit 8 is operated during the charging period, so that the burner 2 is ignited by the ignition operation as described in the section of the operation above.
When the ignition operation continues for a period of time until a predetermined electromotive force is generated from the thermocouple 5, the electromagnetic safety valve 1 is kept open by the thermocouple 5 even if the ignition (valve opening) operation is subsequently canceled. If the burner 2 continues to burn normally, and the ignition operation is canceled before a predetermined electromotive force is generated from the thermocouple 5, the electromagnetic safety valve 1 is activated regardless of whether or not the burner 2 ignites. Since the valve is not held in the open state, when burner 2 is ignited, the combustion of burner 2 is immediately stopped, and when burner 1 is not ignited, burner 2 is maintained in the stopped state from the beginning, which is safe. .

If the above ignition operation is a hot start,
The thermocouple 5 is in a state of generating a predetermined electromotive force due to the remaining heat, and the electromagnetic safety valve 1 is kept open, so when the burner 2 is ignited by the ignition operation, normal combustion of the burner 2 occurs. continues,
Furthermore, since the burner 2 performs the ignition operation instantaneously, even if the spark from the ignition circuit 8 is not sufficient and the ignition does not occur, the release switch 18 can be activated by canceling the ignition operation.
is opened, the capacitor 8 is charged, and the operation of the ignition circuit 6 is continued for a predetermined period of time. Within this predetermined period of time, the burner 2 is reliably ignited, and combustion of the burner 2 is started safely.

In addition, if a misfire occurs during combustion of burner 2,
Since the thermocouple 5 is not heated and no longer generates a predetermined electromotive force, the electromagnetic safety valve 1 is closed, the gas supply is stopped, and it is safe.

FIG. 2 shows another embodiment of the present invention, in which the coil 4 of the electromagnetic safety valve 1 is composed of a compound winding coil with low power consumption, and one of the coils 4
A was connected to the thermocouple 5, and the other coil 4b was connected to the battery 7.

Further, in addition to the ignition circuit 6, a timer circuit 20, a flame detection circuit 21, and a safety valve drive circuit 22 are provided in the power supply circuit 19 of the coil 4b.

The timer circuit 20 operates for a certain period of time until a predetermined electromotive force is generated from the thermocouple 5 in conjunction with the ignition operation.
4 is charged for a certain period of time, transistors 25, 26, and 27 are made conductive during this charging period, and the voltage of the battery 7 is applied to the subsequent flame detection circuit 21 for the certain period of time, thereby setting the flame detection circuit 21 in a ready state for operation. It was made into a thing.

The flame detection circuit 21 is of a flame rod type, and the oscillation circuit 2 is activated by the operation of the timer circuit 20.
8 is activated, an alternating current voltage from the oscillation circuit 28 is applied to the flame rod 29, and when the burner 2 is ignited, the rectified current flowing through the flame to the flame rod 29 causes the transistor 30 to become non-conductive. I took it as a thing.

The safety valve drive circuit 22 includes two transistors 3.
1, 32, a current limiting resistor 33, and a coil 4b, the transistor 3 of the flame detection circuit 21
0 is non-conductive, the transistors 31 and 32 are conductive and the voltage of the battery 7 is applied to the coil 4b.

When doing so, close the electromagnetic safety valve 1 by ignition operation.
The valve opens, gas is supplied to the burner 2, the hold switch 23 is switched, the ignition circuit 6 is activated, the timer circuit 20 is started to operate for a certain period of time, and the voltage of the battery 7 is increased through the transistor 27. is applied to the flame detection circuit 21, and the flame detection circuit 2
1 is placed in a ready state.

In this case, the timer 13 continues sparking for a predetermined period of time even after the ignition operation is canceled.

Here, if the above ignition operation is a cold start, when the burner 2 is ignited by a spark from the ignition circuit 6, a rectified current flows through the flame rod 29, the flame detection circuit 21 is activated, and the voltage of the battery 7 is reduced by the safety valve. The voltage is applied to the coil 4b of the electromagnetic safety valve 1 through the transistor 32 of the drive circuit 22, and the electromagnetic safety valve 1 is kept open for a certain period of time by the timer circuit 20, and then the electromagnetic safety valve 1 is heated by the burner 2. Coil 4a due to a predetermined electromotive force from
is energized and held in the open state, allowing the burner 2 to continue normal combustion.

Further, when the burner 2 does not ignite due to the spark of the ignition circuit 6, no current flows to the flame rod 29, the flame detection circuit 21 becomes inactive, and the battery 6
voltage is not applied to the coil 4b, and the electromagnetic safety valve 1
The valve is quickly closed, and the burner 2 is maintained in a stopped state, which is safe.

If the above ignition operation is a hot start,
The thermocouple 5 continues to generate a predetermined electromotive force due to the remaining heat, which is supplied to the coil 4b and the electromagnetic safety valve 1 is kept open, so when the burner 2 is ignited by the spark of the ignition circuit 8, Normal combustion of burner 2 continues.

In addition, since the ignition operation was performed instantaneously, if the burner 2 does not ignite due to insufficient spark from the ignition circuit 6, the timer circuit 1
3, the operation of the ignition circuit 6 continues for a predetermined period of time and the spark continues for a predetermined period of time, so that the burner 2 is reliably ignited within this predetermined period of time, combustion of the burner 2 starts, and no raw gas is released. It's safe.

In the embodiment shown in FIG. 2, a thermocouple 33 is prepared outside the thermocouple 5, and both 5 and 33 are connected with opposite polarity, and this is connected to the coil 4a.
When burner 2 becomes oxygen deficient, thermocouple 33 generates an electromotive force in the opposite direction to thermocouple 5, so that the electromotive force of both 5 and 33 cancels out and closes electromagnetic safety valve 1. .

In the embodiments shown in FIGS. 1 and 2, a conventionally known push-push type or push-and-turn type is used as the operator for ignition operation, and in the embodiment shown in FIG. The ignition switch 14 and the release switch 18 are closed by the operation, the release switch 18 is opened by the release of the ignition operation, and the ignition switch 14 is opened by the extinguishing operation.In the embodiment shown in FIG. 2, the release switch 18 is closed by the ignition operation and held. The switch 23 is switched,
The release switch 18 is opened by canceling the ignition operation, and the hold switch 23 is returned to its original position by the extinguishing operation.

In the embodiment shown in FIGS. 1 and 2, numeral 34 indicates the burner 2 and a main valve that opens and closes in conjunction with the extinguishing operation.

(Effects of the Invention) As described above, according to the present invention, a timer circuit is provided which is activated when the ignition operation is released and continues the operation of the ignition circuit for a predetermined period of time, so that the ignition operation stops the use of the combustor and then restarts immediately. This corresponds to a re-ignition operation during use, in other words, heat remains and the thermoelectric element continues to generate a predetermined electromotive force,
Even if the electromagnetic safety valve is held open and gas is being supplied to the burner, and the burner is not ignited due to insufficient spark during the ignition operation, the timer circuit after the ignition operation is canceled Since the burner is reliably ignited by the continuous operation of the ignition circuit for a predetermined period of time, there is no possibility that raw gas is continuously emitted, which is advantageous in terms of safety.

Furthermore, according to the present invention, since the timer circuit is operated for a predetermined period of time after the ignition operation is canceled, the ignition of the burner is more effective than when the timer circuit is operated for a predetermined period of time at the beginning of the ignition operation or during the ignition operation. It has the effect of being reliable.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the invention, and FIG. 2 is a circuit diagram showing another embodiment of the invention. 1... Electromagnetic safety valve, 2... Burner, 3... Gas supply path, 4, 4a... Coil, 5... Thermocouple (thermoelectric element), 6... Ignition circuit, 13... Timer circuit,
18...Release switch.

Claims (1)

[Claims] 1. An electromagnetic safety valve that is interposed in the gas supply path to the burner and opens in conjunction with the ignition operation, an ignition circuit that operates in conjunction with the ignition operation, and an electromagnetic safety valve that is connected to the coil of the electromagnetic safety valve and that is heated by the burner. 1. A combustion control device comprising a thermoelectric element comprising: a timer circuit which is activated upon release of an ignition operation to continue operation of the ignition circuit for a predetermined period of time;