Patent ID: 6655929
Filing Date: 2003-12-02
Classification: F04D

Abstract:
A cooling fan dust structure comprising: a blade unit, a frame, a stator assembly, a circular motor base provided at a center of said frame, a fixation base formed by two flanges concentrically arranged in said motor base in different diameters provided for said stator assembly to fix said stator assembly in position, a friction buffer provided at a center of said fixation base for said stator assembly, a bearing bushing in said stator assembly, a bearing in said bearing bushing, and a through hole formed on an end surface of said bearing to allow insertion of a latching bit through a spindle of said fan blade unit to engage a collar of said spindle, said fan blade unit creating airflow when driven, said spindle extending from a center of an inner surface of said fan blade unit, a motor casing and a permanent magnet being provided on an inner edge of said fan blade unit, a plurality of fins around said spindle at equal spacing from one another protruding from an inner surface of said fan blade unit and each of said fins being made in linear or crescent form and arranged in radius from said spindle at an inclination, whereby when assembled, said bearing connected to said spindle is placed at said bearing bushing at a center of said stator assembly so that an end of said spindle holds against said friction buffer in said fixation base for said stator assembly for said bearing bushing and said bearing to define a space of storage of lubrication to said spindle and said latching bit, and once said fan blade unit starts to rotate, air is disturbed inside a hood of said fan blade unit by said fins to outwardly expel airflow so as to prevent an easy ingress of said airflow carrying dust into said spindle thus achieving dust-proof and helping cool down said stator assembly.