| 摘要 |
A burner has a mixing tube, a side tube, an auxiliary tube and a fire bridge. The auxiliary tube with a diameter smaller than that of the mixing tube is mounted above the mixing tube and is connected to the control valve connected to the mixing tube. Multiple orifices are defined in the top of the auxiliary tube. The fire bridge is connected between the mixing tube and the auxiliary. Multiple orifices are defined in the top of the fire bridge. Accordingly, the flames can be switched between the side tube and the auxiliary tube. With a diameter of the auxiliary tube being small relative to the mixing tube, the flame on the auxiliary tube will not go out even when a small quantity of gas is led into the auxiliary tube. Consequently, the burner can provide a reliable low level heat function.
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