Intelligence rain -tight type roof fan

The utility model discloses an intelligence rain -tight type roof fan, including first transmission shaft, first transmission shaft is installed in the inside of left side ventilation pipe with screw blade, and the left side ventilation pipe is 135 degrees with the contained angle of host computer socle face, and just the left side ventilation pipe welds on host computer pipe lateral wall, and both intercommunications, secondary drive axle and screw blade install in the inside of right side ventilation pipe, and the contained angle of right side ventilation pipe and host computer socle face be 45 degrees, and right side ventilation pipe and left side ventilation pipe be the axial symmetry with the axis of host computer pipe, and ventilation pipe welding in right side is on host computer pipe lateral wall, and both communicate. This intelligence rain -tight type roof fan upward drives two screw blade through a motor simultaneously, and the resource has been saved to increase convulsions volume, adopts the desi