Light weight alloy blade with PMSM motor energy saving 7.3M/24FT giant industrial ceiling HVLS fan

B.UPWARD 0-1.5 DEGREE
The buffer cavity with the groove adjusts freely to upward 0-1.5 degree when the fan runs under the airflow,eliminate the reverse force generated during the operation,reducing the rebound and pressure then forms a conical airflow to cover more areas.

3.PATENTED MORTISE and TENON CONNECTION
A.BLADE and PETIOLE
Mortise and tenon connection: The convex petiole with concave buffer device form the Joint engaged,eliminate the centrifugal force from the blades when the fan is running and the shear force when the fan starts and stops. The transverse screw is the same direction
with fan running track to avoiding the shear in order to ensure the blade will not broken,eliminate the possible Safety hazards radically.

B.PETIOLE and WHEEL HUB
The concave-convex section integrates the petiole and hub/motor,the whole fan withstand the centrifugal force and all fasteners are not stressed.

C.MOTOR and FLANGE ROULETTE
Anti-falling ring(Geared motor Fan):Connect the 5 petioles into a whole to form the sleeve with frame lower hub to prevent the hub from falling. Anti-falling roulette(PMSM fan):The concave flange roulette engaged with the convex anti-falling ring each other under the gravity to ensure the reliable connection between the flange roulette andmotor.