| 摘要 |
PURPOSE:To obtain a safe combustion machine by providing a premixing mechanism in which the primary air ratio mu becomes approximately 1.2 and a control mechanism which stops the supply of fuel when the oxygen concentration detected value of a detection element has reached approximately 0%. CONSTITUTION:After starting combustion in which a gaseous mixture having the primary air ratio mu of 1.2 performs stable combustion on a combustion plate 4, when the O2 concentration within the chamber is lowered by approximately 15% and the substantial air ratio mu of the gaseous mixture becomes approximately 1.0, the electromotive force of a zirconia sensor 6 is rapidly increased. That is, when the increasing point of the motive force is detected by a controller 10 to close an electromagnetic valve 11, the operation of the combustion machine can be stopped at the indoor O2 concentration of approximately 18%. By this procedure, it is possible to construct a room open type combustion machine. |
