Patent ID: 7201562
Filing Date: 2007-04-10
Classification: F04D

Abstract:
1. A fan with central intake comprising: a fan frame with an inlet side and an outlet side; a cylindrical hub seat being disposed at the center of the outlet side and fixedly joined to the fan frame, providing a cylindrical central joining part therein and four joining bars being arranged to join the inner wall surface of the hub seat and the outer surface of the joining part such that an annular spacing is formed between the hub seat and the joining part; at least two bearings being disposed in and fitting with the joining part; a spindle rotatably fitting with the bearings with an extending section reaching the inlet side; a fan wheel being received in the fan frame, having a hub with a short U shaped cross section, an open side facing the hub seat and a hub wall with a circular opening being opposite to the open side, and having a plurality of blades, which extend from hub; and a fan motor providing a rotor joined to the inner circumferential side of the hub and a stator between the hub and the hub seat; characterized in that the blades radially extend from the outer circumferential side of the hub to allow an end of the respective blade joining a cylindrical receiving part, which is centrally disposed in front of the hub to tightly fit with the extending section of the spindle; and both the annular spacing and the circular opening constitute a central flow route available for passing fluid.