A blowing mechanism for a column type electric fan comprises an
impeller, a driving motor, a tube-like air ducting
assembly, and a swing mechanism. The driving motor is mounted onto a supporting plate which is attached to a housing of the fan. A
micromotor of the swing mechanism is fixed onto a connecting disc-like part of the housing. The air ducting
assembly at least partly encloses the
impeller from outside. The air ducting
assembly comprises a top part, a bottom part and a flow guiding plate and a flow deflecting plate connected between the top part and the bottom part, and is provided with an air inlet and an air outlet. An upper supporting shaft for the
impeller is rotatably attached to the housing through a bearing, and a lower supporting shaft for the impeller is connected to an output shaft of the driving motor. A guiding lattice is arranged at the air outlet of the air ducting assembly. Bearing rollers are disposed on the supporting plate. The air ducting assembly is movably carried on the bearing rollers, the air ducting assembly is equipped with retainers for preventing the air ducting assembly from moving beyond desired limit angular positions during its swing motion. A link rod of the swing mechanism is movably connected to a rocker which extends from the air ducting assembly.