Smoke prevention and exhaust air duct system based on basement concrete floor structure

The utility model belongs to the field of ventilation devices. The smoke prevention and exhaust air pipe system is based on a basement concrete floor slab structure. An air inlet of an existing air pipe is generally provided with shutter type blades for dust prevention. But in such a way, firstly, the gas is not thoroughly filtered; in addition, dust attached to the blades is inconvenient to clean. Proposed now is the following scheme, the device comprises an air pipe, a barrel-shaped filter screen is hermetically and rotatably connected to the inner wall of the air pipe; a mounting pipe is fixedly mounted on the inner wall of the top of the air pipe; according to the utility model, the barrel-shaped filter screen is arranged, so that dust in external air can be well filtered; according tothe dust removal device, the dust amount entering the air pipe can be greatly reduced, then the driving motor is started to drive the barrel-shaped filter screen to rotate, dust attached to the barrel-shaped filter screen ca