Patent ID: 7568884
Filing Date: 2009-08-04
Classification: F04D

Abstract:
1. A blowing mechanism for a column type electric fan, comprising an impeller, a driving motor, a tube-like air ducting assembly, and a swing mechanism, wherein the driving motor is mounted onto a supporting plate attached to 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, characterized in that, 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, and a link rod of the swing mechanism is movably connected to a rocker which extends from the air ducting assembly.