由于掘进接续或施工顺序的变化,以及局扇供电系统或机械部分故障,致使掘进停工、停风的现象是经常发生的。在瓦斯矿井中停风的盲巷要发生瓦斯积聚。在掘进巷道恢复施工或接近贯通时,排除盲巷内积聚瓦斯的最好方法是卸流排放,即通过三通或称做“T”形风筒的装置,将局扇风量分为两部分,一部分直接送往工作面(瓦斯区),一部分 Due to changes in tunneling or construction sequence, and partial fan power supply system or mechanical failure, resulting in tunneling down, stop the phenomenon of wind is a frequent occurrence. Methane accumulation occurs in blind lanes stopped in gas mines. The best way to eliminate the accumulation of gas in the blind lane when the roadway is resumed or nearly closed is to unload the discharge air through the device of the tee or “T” shaped air duct, dividing the fan air volume into two parts, Some of them are sent directly to the working face (gas zone), part of it