The invention relates to an
airflow downdraft preventing lampblack exhauster which consists of a shell that is provided with left and right wind suction orifices and a master air vent, as well as an
electric control mechanism that comprises a power supply input plug, a
smoke suction fan, an illuminating lamp and a switch; and is characterized in that an electric door closing device that consists of a ring-shaped shell with door spindle installation orifices, an
open type door that is provided with a rigid door spindle and arranged inside the chamber of the ring-shaped shell by the symmetric door spindle installation orifices, as well as a speed reducing motor that can be controlled to drive the rotation of the
open type door is connected with and arranged at the master air vent of the lampblack exhauster; an electric working loop of the
electric control mechanism further comprises a
cam contact switch, the speed reducing motor and a current
relay; and by controlling the
open type doorto rotate by 90 degrees so as to be opened to smoothly
discharge lampblack gases, and further to rotate by 270 degrees so as to be closed, and separating
airflow channels, the lampblack exhauster canhave outdoor
airflow downdraft prevention function, thus having extremely strong practicability and wide market application prospect.