Air supply device

The invention provides an air supply device. The air supply device comprises a motor, fan blades, a supporting structure and a transmission device; the fan blades are of hollow structures; the supporting structure is of a hollow structure, a plurality of supporting parts are arranged on the supporting structure so as to limit the radial displacement of the fan blades through the supporting parts,and the hollow structures of the fan blades and/or the hollow structure of the supporting structure form air passing channels so that air can flow to the other end from one end of the corresponding fan blade through a plurality of air passing channels; and the two ends of the transmission device are connected with the fan blade assembly and an output shaft of the motor correspondingly so that thetransmission device can be driven by the motor to operate to drive the fan blade assembly to rotate, wherein the rotating axis of the fan blade assembly does not coincide with the axis of the output shaft of the motor. By mean