Cooling fan

Abstract

A cooling fan includes: a fan housing mounted on a mounting bracket; a rotary shaft rotatably supported by the fan housing; a rotor fixed to the rotary shaft; a stator fixed to the fan housing and disposed at a predetermined gap from the rotor; an impeller connected to the rotor so as to rotate therewith; and a separation prevention member mounted at an edge on a front surface of the fan housing on which an air discharge port of the fan housing is formed, and protruding in an inward direction of the air discharge port so as to prevent the impeller from being separated from the fan housing, thereby preventing the separation of the impeller while minimizing the area blocking the air discharge port.

What is claimed is: 
     
         1 . A cooling fan comprising:
 a fan housing mounted on a mounting bracket;   a rotary shaft rotatably supported by the fan housing;   a rotor fixed to the rotary shaft;   a stator fixed to the fan housing and disposed at a predetermined gap from the rotor;   an impeller connected to the rotor so as to rotate therewith; and   a separation prevention member mounted at an edge on a front surface of the fan housing on which an air discharge port of the fan housing is formed, and protruding in an inward direction of the air discharge port so as to prevent the impeller from being separated from the fan housing.   
     
     
         2 . The cooling fan of  claim 1 , wherein
 the separation prevention member comprises a fixing portion fixed to an edge of the fan housing, and a locking portion protruding inwardly of the air discharge port from the fixing portion to prevent separation of the impeller.   
     
     
         3 . The cooling fan of  claim 2 , wherein
 the separation prevention member is disposed in a plurality of pieces at a 180-degree interval or a 90-degree interval on the edge of the fan housing.   
     
     
         4 . The cooling fan of  claim 2 , wherein
 the fan housing has a fastening hole portion fastened to the mounting bracket at an edge thereof, and the fixing portion has a through hole communicating with the fastening hole portion, and fixed to an edge of the fan housing.   
     
     
         5 . A cooling fan comprising:
 a fan housing mounted on a mounting bracket;   a rotary shaft rotatably supported by the fan housing;   a rotor fixed to the rotary shaft;   a stator fixed to the fan housing and disposed at a predetermined gap from the rotor; and   an impeller connected to the rotor so as to rotate therewith,   wherein a separation prevention bar is formed in the mounting bracket so as to prevent the impeller from being separated from the fan housing.   
     
     
         6 . The cooling fan of  claim 5 , wherein
 the mounting bracket has an air passage portion communicating with the air discharge port of the fan housing, and the separation prevention bar is formed to extend inwardly from an edge of the air passage portion.   
     
     
         7 . The cooling fan of  claim 6 , wherein
 the separation prevention bar comprises a pair of vertical bars formed in a vertical direction at one edge of the air passage portion so as to be spaced apart from each other so that the separation prevention bar does not interfere with the rotation of the impeller, and   a horizontal bar connecting the pair of vertical bars.