04-06-2014 дата публикации
Номер: CN103835961A
Принадлежит:
A cooling fan comprises a base, a stator and a rotor. A middle column is arranged on the base, the stator is fixed on the periphery of the middle column, the rotor can rotate relative to the stator, the rotor comprises a hub and a rotary shaft with one end fixed to the hub, the middle column is made of polyformaldehyde materials, a containing hole is formed in the middle of the middle column, and the other end of the rotary shaft is a free end, is contained in the containing hole and directly abuts against the middle column. Compared with a traditional cooling fan, due to the fact that the middle column of the cooling fan is made of polyformaldehyde which is high in surface hardness, compact in surface, good in oil resistance and good in mechanical property and rigidity, a wear resisting gasket abutting against the free end does not need to be additionally arranged in the using process of the cooling fan, the free end is in direct contact with the middle column and rotates relative to the ...
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