| 摘要 |
PURPOSE:To improve safety by providing auxiliary air holes near the burner, a thermocouple downstream of the burner and an auxiliary hole between the thermocouple and auxiliary air holes directly under the former as part of an incomplete combustion prevention device for stoves etc. CONSTITUTION:Under the steady combusting condition throughout high to low combustion intensity, air entering from auxiliary air holes 6 and an auxiliary hole 7 to the combustion chamber 3 works as combusting air when premixed gas with a low primary air ratio is combusted for a first stage, and the value of thermal electromotive force at a thermocouple 5 becomes greater. On the other hand, when there is a reduced input under a low combusting intensity, air entering from the auxiliary air holes 6 is used as combusting air to form a flame front, but air from the auxiliary hole 7 acts to break and cool the flame front and also cool the thermocouple 5. Therefore, sensing can be ensured as the change of thermal electromotive force becomes greater on a transition from steady combustion to abnormal combustion. |
