Radiator Fan

Abstract

A radiator fan has a case, a stator assembly, and an impeller assembly. The stator assembly is assembled in the case. The impeller assembly is assembled in the case and has an impeller, a shaft, and a magnetic ring. The impeller has a hub and multiple blades. The hub has a hub diameter. The multiple blades are connected to the hub, are disposed around the hub at equal angular intervals, and have a blade span diameter. A ratio of the hub diameter to the blade span diameter is greater than or equal to 0.395 and is less than or equal to 0.515. The shaft is rotatably assembled to the case. The magnetic ring is fixed inside the hub, is disposed around the shaft, and is separated from the shaft by a gap.

What is claimed is: 
     
         1 . A radiator fan comprising:
 a case;   a stator assembly assembled in the case; and   an impeller assembly assembled in the case and having
 an impeller having
 a hub having a hub diameter; 
 multiple blades connected to the hub, disposed around the hub at equal angular intervals, and having a blade span diameter; and 
 a ratio of the hub diameter to the blade span diameter being greater than or equal to 0.395 and being less than or equal to 0.515; 
 
 a shaft rotatably assembled to the case; and 
 a magnetic ring fixed inside the hub, disposed around the shaft, and separated from the shaft by a gap. 
   
     
     
         2 . The radiator fan as claimed in  claim 1 , wherein the hub has
 a basal portion shaped as a tube with two opposite ends; and   a cap portion formed at one of the two opposite ends of the basal portion and shaped as a hemisphere.   
     
     
         3 . The radiator fan as claimed in  claim 1 , wherein the hub has
 a basal portion shaped as a tube with two opposite ends; and   a cap portion formed at one of the two opposite ends of the basal portion and shaped as a cone.   
     
     
         4 . The radiator fan as claimed in  claim 1 , wherein the hub has
 a basal portion shaped as a tube with two opposite ends; and   a cap portion formed at one of the two opposite ends of the basal portion and shaped as a cone with a flat top.   
     
     
         5 . The radiator fan as claimed in  claim 1 , wherein the ratio of the hub diameter to the blade span diameter is greater than or equal to 0.430 and is less than or equal to 0.480. 
     
     
         6 . The radiator fan as claimed in  claim 2 , wherein the ratio of the hub diameter to the blade span diameter is greater than or equal to 0.430 and is less than or equal to 0.480. 
     
     
         7 . The radiator fan as claimed in  claim 3 , wherein the ratio of the hub diameter to the blade span diameter is greater than or equal to 0.430 and is less than or equal to 0.480. 
     
     
         8 . The radiator fan as claimed in  claim 4 , wherein the ratio of the hub diameter to the blade span diameter is greater than or equal to 0.430 and is less than or equal to 0.480. 
     
     
         9 . The radiator fan as claimed in  claim 1 , wherein
 the radiator fan has a reference plane;   the shaft has an axis being perpendicular to the reference plane of the radiator fan;   each one of the multiple blades has
 an inside edge connected to a periphery of the hub and having a top end; and 
 an outside edge being distal from the inside edge and having a top end; and 
   a distance defined between the reference plane of the radiator fan and the top end of the inside edge is smaller than a distance defined between the top end of the outside edge and the reference plane of the radiator fan.   
     
     
         10 . The radiator fan as claimed in  claim 2 , wherein
 the radiator fan has a reference plane;   the shaft has an axis being perpendicular to the reference plane of the radiator fan;   each one of the multiple blades has
 an inside edge connected to a periphery of the hub and having a top end; and 
 an outside edge being distal from the inside edge and having a top end; and 
   a distance defined between the reference plane of the radiator fan and the top end of the inside edge is smaller than a distance defined between the top end of the outside edge and the reference plane of the radiator fan.   
     
     
         11 . The radiator fan as claimed in  claim 3 , wherein
 the radiator fan has a reference plane;   the shaft has an axis being perpendicular to the reference plane of the radiator fan;   each one of the multiple blades has
 an inside edge connected to a periphery of the hub and having a top end; and 
 an outside edge being distal from the inside edge and having a top end; and 
   a distance defined between the reference plane of the radiator fan and the top end of the inside edge is smaller than a distance defined between the top end of the outside edge and the reference plane of the radiator fan.   
     
     
         12 . The radiator fan as claimed in  claim 4 , wherein
 the radiator fan has a reference plane;   the shaft has an axis being perpendicular to the reference plane of the radiator fan;   each one of the multiple blades has
 an inside edge connected to a periphery of the hub and having a top end; and 
 an outside edge being distal from the inside edge and having a top end; and 
   a distance defined between the reference plane of the radiator fan and the top end of the inside edge is smaller than a distance defined between the top end of the outside edge and the reference plane of the radiator fan.   
     
     
         13 . The radiator fan as claimed in  claim 9 , wherein
 the case has
 a shroud having
 a space disposed inside the shroud; 
 a first vent communicating with the space of the shroud; and 
 a second vent communicating with the shroud; 
 
 a base board disposed below the space of the shroud; and 
 an axial tube portion disposed in the space and connected to the base board; 
   the first vent and the second vent are disposed at two different sides of the shroud;   the stator assembly is assembled to the base board and has multiple wire coils disposed around the axial tube portion;   the impeller assembly is assembled in the space of the shroud;   the shaft of the impeller assembly is rotatably assembled in the axial tube portion;   the hub of the impeller has a chamber with an opening facing downward; and   the magnetic ring is fastened to an inner surface of the chamber and disposed around the multiple wire coils.   
     
     
         14 . The radiator fan as claimed in  claim 10 , wherein
 the case has
 a shroud having
 a space disposed inside the shroud; 
 a first vent communicating with the space of the shroud; and 
 a second vent communicating with the shroud; 
 
 a base board disposed below the space of the shroud; and 
 an axial tube portion disposed in the space and connected to the base board; 
   the first vent and the second vent are disposed at two different sides of the shroud;   the stator assembly is assembled to the base board and has multiple wire coils disposed around the axial tube portion;   the impeller assembly is assembled in the space of the shroud;   the shaft of the impeller assembly is rotatably assembled in the axial tube portion;   the hub of the impeller has a chamber with an opening facing downward; and   the magnetic ring is fastened to an inner surface of the chamber and disposed around the multiple wire coils.   
     
     
         15 . The radiator fan as claimed in  claim 11 , wherein
 the case has
 a shroud having
 a space disposed inside the shroud; 
 a first vent communicating with the space of the shroud; and 
 a second vent communicating with the shroud; 
 
 a base board disposed below the space of the shroud; and 
 an axial tube portion disposed in the space and connected to the base board; 
   the first vent and the second vent are disposed at two different sides of the shroud;   the stator assembly is assembled to the base board and has multiple wire coils disposed around the axial tube portion;   the impeller assembly is assembled in the space of the shroud;   the shaft of the impeller assembly is rotatably assembled in the axial tube portion;   the hub of the impeller has a chamber with an opening facing downward; and   the magnetic ring is fastened to an inner surface of the chamber and disposed around the multiple wire coils.   
     
     
         16 . The radiator fan as claimed in  claim 12 , wherein
 the case has
 a shroud having
 a space disposed inside the shroud; 
 a first vent communicating with the space of the shroud; and 
 a second vent communicating with the shroud; 
 
 a base board disposed below the space of the shroud; and 
 an axial tube portion disposed in the space and connected to the base board; 
   the first vent and the second vent are disposed at two different sides of the shroud;   the stator assembly is assembled to the base board and has multiple wire coils disposed around the axial tube portion;   the impeller assembly is assembled in the space of the shroud;   the shaft of the impeller assembly is rotatably assembled in the axial tube portion;   the hub of the impeller has a chamber with an opening facing downward; and   the magnetic ring is fastened to an inner surface of the chamber and disposed around the multiple wire coils.   
     
     
         17 . The radiator fan as claimed in  claim 13 , wherein the first vent and the second vent are respectively disposed at a top portion of the shroud and a bottom portion of the shroud. 
     
     
         18 . The radiator fan as claimed in  claim 16 , wherein the first vent and the second vent are respectively disposed at a top portion of the shroud and a bottom portion of the shroud. 
     
     
         19 . The radiator fan as claimed in  claim 13 , wherein
 the first vent is disposed at a top portion of the shroud; and   the second vent is laterally defined through the shroud.   
     
     
         20 . The radiator fan as claimed in  claim 16 , wherein
 the first vent is disposed at a top portion of the shroud; and   the second vent is laterally defined through the shroud.