| 摘要 |
PURPOSE:To perform an automatic sensing of an ignition condition and shut off a supplying of gas by a method wherein an infra-red ray sensor for sensing an infra-red ray during combustion and automatic gas supplying control means for stopping a flowing-out of gas when no infra-red ray is detected are provided. CONSTITUTION:Both gas passages 9 and 11 are provided with electromagnetic valves 12, 13 and a sequencer 14 constituting an automatic gas supplying control device, and the electromagnetic valves 12 and 13 are operated in their opening or closing operation by a sequencer 14. As a sensed signal from an infra-red ray sensor 5 is stopped for a specified period of time, the sequencer 14 may operate both electromagnetic valves 12 and 13 to their closed sides. Both electromagnetic valves 12 and 13 are opened while the sequencer 14 is operated, gas is fed from both gas passages 9 and 11 to a nozzle 4, an infra-red ray from a flame at the extremity end of the nozzle is sensed by an infra-red ray sensor 5 and then the opened condition of both electromagnetic valves 12 and 13 is maintained. In turn, when the ignition is not carried out for a specified period of time and the infra-red ray sensor 5 does not sense the infra-red ray, the electromagnetic valves 12 and 13 are closed by the sequencer 14 and the flowing- out of the gas is stopped. |
