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在矿井通风网路中,有许多并联风路,其分支风路的风量是有限制的,我们称其为限量风道。保安规程对矿井的通风井巷都规定了允许的最高风速,超过该风速对煤矿生产安全不利。因此可以说矿井的通风巷都是限量风道。 井巷的通风阻力依阻力定律容易求得,即h=RQ~2。简单并联风路的通风阻力h_并=R_并Q~2。R_并为并联风路的风阻,Q为通过风路的总风量。这样计算必须有一个前提,即分支风路里的风量必须是自然分配的。
In the mine ventilation network, there are many parallel air duct, the air volume of the branch air duct is limited, we call it the limited air duct. Security regulations set the maximum allowable wind speed for ventilation shafts and shafts in mines. Exceeding the wind speed adversely affects the safety of coal mines. It can be said that the mine ventilation tunnel is limited air duct. Ventilation resistance of the shaft is easily obtained according to the law of resistance, that is h = RQ ~ 2. Ventilation resistance h_ and = R_ and Q ~ 2 of simple parallel air duct. R_ and wind resistance parallel wind, Q is the total amount of wind through the wind. This calculation must have a premise that the air flow in the branch air duct must be naturally distributed.