Fan wheel structure

Abstract

A fan wheel structure includes a ring member and a rotor. The ring member has two opposite open ends and an inner space defined between and communicable with the two open ends. A blade seat having a plurality of blades formed therearound is insert-molded on an outer side of the ring member. The rotor includes a hub fitted in the inner space of the ring member to associate with the ring member and the blade seat, and a rotary shaft having a coupling end inserted into the hub. The rotor can be fitted in the inner space of the ring member from either of the two open ends thereof for the completed fan wheel structure to have either a clockwise or a counterclockwise blade rotating direction. Therefore, only one mold, and accordingly an effectively reduced cost, is needed for manufacturing the fan wheel structures of different rotating directions.

What is claimed is: 
     
         1 . A fan wheel structure, comprising:
 a ring member having two opposite open ends, and an inner space defined between and communicable with the two open ends; the ring member being integrally connected at an outer side to a blade seat, and the blade seat including a plurality of blades formed around an outer surface thereof; and   a rotor including a hub and a rotary shaft; the rotary shaft having a free end and an opposite coupling end inserted into the hub; and the hub is fitted in the inner space of the ring member to associate with the ring member and the blade seat.   
     
     
         2 . The fan wheel structure as claimed in  claim 1 , wherein the blade seat is insert-molded to the outer side of the ring member. 
     
     
         3 . The fan wheel structure as claimed in  claim 2 , wherein the ring member further includes at least one lip portion protruded from the outer side of the ring member, and the blade seat being insert-molded to the at least one lip portion to thereby integrally connect to the outer side of the ring member. 
     
     
         4 . The fan wheel structure as claimed in  claim 1 , wherein the hub includes a top and a sidewall; the top including a base portion and a plurality of supporting arms respectively connected to and extended between an outer edge of the base portion and a periphery of the top; and the top and the sidewall together defining a receiving space in the hub. 
     
     
         5 . The fan wheel structure as claimed in  claim 4 , wherein any two adjacent ones of the supporting arms define an opening between them; and the openings being communicable with the receiving space in the hub and a corresponding one of the two open ends of the ring member. 
     
     
         6 . The fan wheel structure as claimed in  claim 4 , wherein the base portion has central through hole, in which a shaft holder is fixedly fitted.