| 摘要 |
PURPOSE:To obtain stable flame electric current of flame rod by a method wherein a flow restricting fitment is provided at the side of vaporizing cylinder of a burner head at a part opposing to the flame rod, in the combustion device effecting pre-mixing combustion employed for kerosine fan heater or the like. CONSTITUTION:The flow restricting fitment 18 is provided at a position opposing to the tip end 17a of the flame rod 17, therefore, mixed gas, ejected from flame ports 16 at this part, is stagnated in a gap formed between the flow restricting fitment 18 and the flame ports 16 or wire net 15. Accordingly, the flow speed of the mixed gas ejected from this part is lower than the same gas ejected from the flame ports 16 at the other parts. As a result, flame 21 at the position opposing to the flame rod 17 is contacted closely with the flame ports 16 compared with the flames 21 of the other parts, therefore, stable flame electric current may be obtained even if the balance of air-fuel ratio is unbalanced to some degree. |
