First, Axial flow fanWhether the fan is supply or exhaust
The axial flow fan is a fan One, the ventilation equipment has both air supply equipment and exhaust air equipment, so is the axial flow fan supply air or exhaust air?
The axial flow fan has both a supply fan and an exhaust fan. With the system as the center, the fan outlet medium flows to the system, that is, the supply fan; the fan outlet medium flows out of the system, that is, the exhaust fan. Generally speaking, the wind direction of the axial flow fan will be marked with an arrow, and it can be judged whether it is supplying or exhausting air according to the blades and the direction of rotation; is sucked in and interferes with the fan), so that you can stand below and see whether the fan is supplying or exhausting when the fan is on.
Second, whether the axial flow fan in the tunnel supplies air into the tunnel or exhausts air outside the tunnel
The axial flow fan in the tunnel is used in the tunnel Axial flow fan, this kind of axial flow fan generally has two functions of air supply and exhaust. The forward rotation of the tunnel axial flow fan means that the fan exhausts air from the tunnel to the outside atmosphere, and the reverse rotation means that the fan supplies air to the tunnel.
Due to the explosion of explosives, the use of internal combustion engines, the release of harmful gases from the ground during excavation, the exhaust gas of internal combustion engines and transport vehicles, and the lack of oxygen in the tunnel during tunnel construction, it is necessary to use tunnel axial flow. The fan blows air inward, thereby removing harmful gases and reducing dust concentration. When the tunnel is relatively hot, heat and exhaust gas accumulate, or when a fire occurs in the tunnel, an axial flow fan needs to be used to exhaust air to the outside.
