JPH0332687B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention applies current to the operating coil of an electromagnetic safety valve during ignition operation, and immediately attracts and holds the safety valve installed in the gas supply passage open, thereby preventing the ignition button from turning off. This invention relates to a so-called one-touch ignition type ignition device for gas water heaters that shortens the pressing time and activates an igniter to emit a spark to ignite.

(Prior art) Conventionally, as illustrated in FIG. 3, when extinguishing a fire, the capacitor 4 is connected to the battery 6 to keep it in a charged state, and when the ignition is operated, the capacitor 4 is connected to the operating coil 2b and the relay 3 by the switch 5. The operating coil 2b is excited by the discharge current, the safety valve 2 is attracted and held open, and the relay 3 is activated to turn on its contact 7.
An igniter 8 is connected to the battery 6 to emit a spark and ignite the battery. Therefore, the discharge voltage of the capacitor 4 applied to the actuating coil 2b and the relay 3 during the ignition operation and the battery voltage applied to the igniter 8 differ due to the presence of the internal resistance of the battery 6. In other words, since the capacitor 4 is charged when the gas water heater is extinguished, it is possible to have sufficient charging time, and the battery is charged to the electromotive force value E without being affected by the internal resistance of the battery, so that it can be ignited. During operation, a capacitor discharge voltage E equal to the electromotive force value E of the battery is applied to the actuating coil 2b and the relay 3. On the other hand, when the igniter 8 operates, the battery voltage Vo that can be extracted due to the internal resistance of the battery becomes lower than the discharge voltage E of the capacitor 4, and the battery voltage Vo that can be extracted also fluctuates due to variations in the internal resistance of each battery.

Therefore, the operating coil 2b is energized by the capacitor discharge voltage E which is higher than the safety valve attraction level voltage, and attracts and holds the safety valve open, and the relay 3 also operates, turning on its contact 7 and connecting the igniter 8 to the battery 6. do. However, the igniter 8 may not operate when the applied battery voltage Vo is lower than the guaranteed operating voltage due to the influence of internal resistance, and as a result, there is a risk that raw gas will be released.

In addition, since the internal resistance value varies for each battery, even if the voltage applied to the actuating coil 2b is set to the predetermined safety valve adsorption level voltage, the voltage applied to the igniter 8 will vary depending on the battery used, and the igniter will In some cases, the voltage becomes lower than the guaranteed operation voltage of No. 8, and it is difficult to set the voltage applied to the actuating coil 2b, making it difficult to completely prevent the release of raw gas.

(Objective of the Invention) In view of the above drawbacks, the present invention aims to set the operating voltages of the operating coil and the igniter under the same conditions so that both the capacitor and the igniter are equally affected by the internal resistance of the battery. The purpose of this is to prevent the igniter from being inoperable due to activation of the operating coil (and relay) during ignition operation, and to prevent the release of raw gas.

(Structure of the Invention) The present invention provides a thermocouple safety circuit consisting of a thermocouple and an electromagnetic safety valve, and the electromagnetic safety valve is wound with two coils, the thermocouple is connected to one holding coil, and the other working coil is connected to the thermocouple safety circuit. An ignition circuit is provided in which an igniter is connected to a battery through the contacts of a relay connected in parallel to the battery. connect to
In addition, the switch is provided with a short circuit for discharging the capacitor, and the ignition/extinguishing changeover switch is used to set the capacitor charging circuit at the time of ignition operation and to set the capacitor short circuit at the time of extinguishing the fire, so that the charging current of the capacitor flows to the operating coil of the electromagnetic safety valve. This is how it was done.

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

In FIG. 1, A is a thermocouple safety circuit that controls the opening and closing of an electromagnetic safety valve 2 installed in a gas supply passage using thermoelectromotive force generated in a thermocouple 1. When pair 1 is connected and thermocouple 1 is heated by the burner flame and generates a thermoelectromotive force, the holding coil 2a is energized to keep the electromagnetic safety valve 2 open, and when the burner flame is extinguished, the electromagnetic safety valve is closed. be. Reference numeral 2b denotes the other operating coil of the electromagnetic safety valve 2, which is energized by applying a voltage higher than the attraction level voltage during ignition operation and immediately attracts and holds the electromagnetic safety valve 2 open. A relay 3 is connected in parallel to this actuating coil 2b,
The parallel circuit is connected to a battery 6 through a capacitor 4 and an ignition/extinguishing switch 5 in series, and the switch 5 is provided with a short circuit D for discharging the capacitor 4. A charging circuit B is configured. Further, when the fire is extinguished, both ends of the capacitor 4 are short-circuited by the switch 5 to form a discharge circuit D. C is an ignition circuit formed by connecting an igniter 8 to a battery 6 via a contact 7 of the relay 3. Note that 9 is a resistor for adjusting the voltage applied to the actuating coil 2b, and is used to set the voltage to be higher than the suction level voltage of the safety valve.

With the above configuration, when extinguishing a fire, the ignition/extinguishing changeover switch 5 constitutes a capacitor short circuit D, short-circuiting and discharging the capacitor 4, and when igniting, the switch 5 switches in conjunction with the ignition operation to configure a capacitor charging circuit B, and the battery 6 activates the actuating coil 2b.
A charging current flows through the relay 3 and the capacitor 4 is charged. The charging current excites the operating coil 2b, and the safety valve is immediately attracted and held, opening the gas supply passage and starting to supply gas. At the same time, relay 3 is activated and its contact 7 is activated.
The battery 6 is turned on, and the voltage of the battery 6 is applied to the igniter 8, causing a spark to be emitted and the gas to be ignited.

As shown in FIG. 2, the output voltage of the battery 6 during charging of the capacitor 4 is lower than the electromotive force E of the battery 6 due to the influence of the internal resistance 10 of the battery 6, and becomes Vo.
The voltage applied to the igniter 8 is also Vo because the capacitor charging circuit and the igniter 8 are connected in parallel.
It is. Therefore, the influence of the internal resistance 10 of the battery 6 acts equally on the charging of the capacitor 4 and the operation of the igniter 8.

(Effects of the Invention) As described above, according to the present invention, the battery voltage Vo (capacitor charging voltage) that can be extracted from the battery during ignition operation is applied to the actuating coil and the relay, and the battery voltage Vo is also applied to the igniter. ,
Since the effect of the internal resistance of the battery is made to affect the capacitor and igniter equally, the effect of internal resistance on the operating voltage of the operating coil and igniter and the effect of differences in internal resistance of the batteries used are eliminated, resulting in improved operation. Since there is no difference in voltage, it is possible to set the operating voltages of the operating coil and igniter under the same conditions. Therefore, the actuating coil (and relay) can be activated by an extremely simple operation of setting the attraction level voltage applied to the actuating coil to the igniter's guaranteed operating voltage, or setting the adsorbing level voltage to a value lower than the igniter's guaranteed operating voltage. There is no situation where the igniter does not work even though it works.
The danger of raw gas being blown out is completely prevented and ignition is done safely.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an ignition device for a gas water heater according to the present invention, and FIG. 2 is an explanatory diagram showing the relationship between the capacitor charging circuit and the voltage applied to the igniter.
FIG. 3 is a circuit diagram of a conventional ignition device for a gas water heater. 1... Thermocouple, 2... Electromagnetic safety valve, 2a... Holding coil, 2b... Operating coil, 3... Relay, 4... Capacitor, 5... Ignition/extinguishing switch, 6... Battery,
7...Relay contact, 8...Igniter, A...Thermocouple safety circuit, B...Capacitor charging circuit, C...Ignition circuit, D...Short circuit.

Claims (1)

[Claims] 1 A thermocouple safety circuit A is provided which controls the opening and closing of an electromagnetic safety valve 2 installed in the gas supply passage by thermoelectromotive force generated in the thermocouple 1, and the electromagnetic safety valve 2
is wound with two coils, one of which is the holding coil 2a.
An ignition circuit C is provided in which the thermocouple 1 is connected to the ignition circuit C, a relay 3 is connected in parallel to the other working coil 2b, and an igniter 8 is connected to the battery 6 via the contacts 7 of the relay 3. Said working coil 2
A capacitor 4 and an ignition/extinguishing changeover switch 5 are interposed in series in the parallel circuit of b and the relay 3 and connected to a battery 6, and the switch 5 is provided with a short circuit D for discharging the capacitor 4. An ignition device for a gas water heater, characterized in that a switch 5 is used to set a capacitor charging circuit B during ignition operation and to set a capacitor short circuit D when extinguishing the fire.