Pipeline centrifugal fan

The utility model discloses a pipeline centrifugal fan, which relates to the technical field of pipeline fans, and comprises a device body and an air inlet mechanism, the air inlet mechanism comprises a fixed sleeve, a first ventilation plate is arranged on the inner wall of one side of the fixed sleeve, a second ventilation plate is arranged on the inner wall of the other side of the fixed sleeve, and the first ventilation plate and the second ventilation plate are arranged in parallel. A toothed ring is mounted on the inner wall of the fixed sleeve, a mounting plate is mounted on the inner side of the toothed ring, cleaning brushes are mounted on the outer walls of the two sides of the mounting plate, and a discharging opening is formed in the bottom of the fixed sleeve. Gas can be filtered through a second ventilation plate and a first ventilation plate, and meanwhile, a second motor works to enable two cleaning brushes to clean the outer walls of the opposite sides of the first ventilation plate and the s