| 摘要 |
PURPOSE:To interrupt gas freely in oxygen concentration of approximate 18% even in city gas by a mechanism wherein auxiliary flame holes are mounted under a main flame hole and oxygen is made insufficient around the main flame hole. CONSTITUTION:Fuel is previously burnt under an oxygen shortage condition when oxygen concentration is normal. If oxygen concentration around a primary flame A1 of a main flame hole 10 is made to be approximate 11-12% when oxygen in a room is really insufficient, i.e. when oxygen concentration becomes to the oxygen shortage condition of approximate 18%, the primary flame A1 goes out due to oxygen shortage. When oxygen concentration is made to be approximate 13%, the flame lifts and the primary flame changes to a flame with a low temperature as A2 and a secondary flame as B2. Thus, the electromotive force of a thermocouple 16 remarkably lowers as compared to electromotive force in the case when the primary flame is A1, and cannot adsorb a solenoid valve 19, and the valve is closed. |
