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目前，我国绝大部分地方煤矿采用472－11系列通风机作为矿井的主通风机，风流离开主通风机的速度变化一般在20～50m／s，其动压损失是很大的。为了减少其动压损失，几乎设在地面的主通风机都装有扩散器，其目的是将部分速压变成静压，提高主通风机用于克服矿井通风阻力的风机静
At present, most local coal mines use 472-11 series ventilators as the main ventilator of the mine, and the speed change of the airflow leaving the main ventilator is generally 20-50 m / s, and the dynamic pressure loss is great. In order to reduce the dynamic pressure loss, almost all the main ventilators installed on the ground are equipped with diffusers, the purpose of which is to turn part of the supercritical pressure into static pressure and enhance the main ventilator for overcoming the ventilation resistance of the mine