Fan assembly and impeller thereof

Abstract

A fan assembly and impeller thereof. The impeller comprises a hub having an upper surface, an axial sidewall extended along the axis of the impeller, and a corner connected between the upper surface and the axial sidewall; and a plurality of blades directly connected to the upper surface, the corner or the axial sidewall of the hub to define an air-intake space between an inner edge of the blades faced to the axis of the impeller and the upper surface of the hub for allowing the intake airflow to radially flow toward the blades.

1 . An impeller comprising: 
 a hub having an upper surface, an axial sidewall extended along the axis of the impeller, and a corner connected between the upper surface and the axial sidewall; and    a plurality of blades directly connected to the upper surface, the corner or the axial sidewall of the hub to define an air-intake space between inner edges of the blades faced to the axis of the impeller and the upper surface of the hub for allowing an intake airflow to radially flow toward the blades.    
   
   
       2 . The impeller as claimed in  claim 1 , wherein the blades are arranged as an annular structure having an outer diameter greater than that of the hub, and an inner diameter less than or equal to the outer diameter of the hub.  
   
   
       3 . The impeller as claimed in  claim 1 , wherein each of the blades has a bottom end extending downward along the axial sidewall and there is height difference between the bottom end of the blade and a lower end of the hub.  
   
   
       4 . The impeller as claimed in  claim 1 , wherein the blades are radially extended and has an outer edge protruded out from the corner of the hub.  
   
   
       5 . The impeller as claimed in  claim 1 , wherein the blades are arranged as an annular structure having an outer diameter equal to or less than that of the hub.  
   
   
       6 . The impeller as claimed in  claim 1 , wherein each blade is only directly connected to the upper surface and the corner of the hub and has an outer edge aligned with the axial sidewall of the hub.  
   
   
       7 . The impeller as claimed in  claim 1 , wherein each blade is only directly connected to the upper surface of the hub.  
   
   
       8 . The impeller as claimed in  claim 1 , wherein each blade is only directly connected to the upper surface and the corner of the hub.  
   
   
       9 . The impeller as claimed in  claim 1 , wherein each blade is only directly connected to the axial sidewall of the hub.  
   
   
       10 . The impeller as claimed in  claim 1 , wherein each blade is directly connected to the upper surface, the corner and the axial sidewall of the hub.  
   
   
       11 . The impeller as claimed in  claim 1 , further comprising an ring formed on an outer top corner of the blades to connect the blades, wherein a periphery of the ring is aligned with outer edges of the blades.  
   
   
       12 . The impeller as claimed in  claim 1 , wherein the hub and the blades are integrally formed as a single unit.  
   
   
       13 . A fan assembly comprising: 
 an impeller comprising: 
 a hub having an upper surface, an axial sidewall extended along the axis of the impeller, and a corner connected between the upper surface and the axial sidewall; and  
 a plurality of blades directly connected to the upper surface, the corner or the axial sidewall of the hub to define an air-intake space between inner edges of the blades faced to the axis of the impeller and the upper surface of the hub for allowing an intake airflow to radially flow toward the blades; and  
   a motor mounted within the hub of the impeller for driving the impeller to rotate.    
   
   
       14 . The fan assembly as claimed in  claim 13 , wherein the blades are arranged as an annular structure having an outer diameter greater than that of the hub, and an inner diameter less than or equal to the outer diameter of the hub.  
   
   
       15 . The fan assembly as claimed in  claim 13 , wherein each of the blades has a bottom end extending downward along the axial sidewall and there is height difference between the bottom end of the blade and a lower end of the hub.  
   
   
       16 . The fan assembly as claimed in  claim 13 , wherein the blades are radially extended and has an outer edge protruded out from the corner of the hub.  
   
   
       17 . The fan assembly as claimed in  claim 13 , wherein the blades are arranged as an annular structure having an outer diameter equal to or less than that of the hub.  
   
   
       18 . The fan assembly as claimed in  claim 13 , further comprising an ring formed on an outer top corner of the blades to connect the blades, wherein a periphery of the ring is aligned with outer edges of the blades.  
   
   
       19 . The fan assembly as claimed in  claim 18 , wherein the hub, the blades and the ring are integrally formed as a single unit.  
   
   
       20 . The fan assembly as claimed in  claim 13 , further comprising a frame for receiving the impeller and the motor therein.  
   
   
       21 . The fan assembly as claimed in  claim 20 , wherein when the impeller is driven by the motor to rotate, an airflow is axially suck and axially flow out of the frame.  
   
   
       22 . The fan assembly as claimed in  claim 13 , wherein when the impeller is driven by the motor to rotate, an airflow is axially suck and radially flow out.