Fan and impeller thereof

Abstract

An impeller includes a hub, a plurality of blades, and an annular structure. The blades are disposed around the hub. The annular structure is connected to the blades. The annular structure includes a plurality of apertures. A balance material is filled in the apertures to achieve rotational balance of the impeller. Furthermore, a fan with the described impeller is provided. The fan and the impeller improve rotational stability, reliability and product life.

1 . An impeller comprising:
 a hub;   a plurality of blades disposed around the hub; and   an annular structure connected to the blades,   wherein the annular structure comprises a plurality of apertures.   
   
   
       2 . The impeller as claimed in  claim 1 , wherein the annular structure and the hub are arranged concentrically. 
   
   
       3 . The impeller as claimed in  claim 1 , wherein the annular structure is disposed at a periphery of blades, at the free ends of the blades, close to the hub, or at any position of the blades. 
   
   
       4 . The impeller as claimed in  claim 1 , wherein the shape of the aperture is rectangular, semicircular, or other any shape. 
   
   
       5 . The impeller as claimed in  claim 1 , wherein the aperture further comprises at least one tooth formed therein. 
   
   
       6 . The impeller as claimed in  claim 1 , wherein the apertures are disposed at inner edge of an end surface or an outer edge of the annular structure. 
   
   
       7 . The impeller as claimed in  claim 1 , wherein any two adjacent apertures comprise a partition which can be removed by a tool. 
   
   
       8 . The impeller as claimed in  claim 1 , wherein the aperture has a cross section obliquely shaped along the centrifugal direction of the impeller. 
   
   
       9 . The impeller as claimed in  claim 1 , further comprising a balance material filled in the aperture to achieve the rotational balance of the impeller. 
   
   
       10 . The impeller as claimed in  claim 9 , wherein the balance material is epoxy resin or clay. 
   
   
       11 . A fan comprising a motor and an impeller, the impeller comprising:
 a hub;   a plurality of blades disposed around the hub; and   an annular structure connected to the blades,   wherein the annular structure comprises a plurality of apertures.   
   
   
       12 . The fan as claimed in  claim 11 , wherein the annular structure and the hub are arranged concentrically. 
   
   
       13 . The fan as claimed in  claim 11 , wherein the annular structure is disposed at a periphery of blades, at the free ends of the blades, close to the hub, or at any position of the blades. 
   
   
       14 . The fan as claimed in  claim 11 , wherein the shape of the aperture is rectangular, semicircular, or other any shape. 
   
   
       15 . The fan as claimed in  claim 11 , wherein the aperture further comprises at least one tooth formed therein. 
   
   
       16 . The fan as claimed in  claim 11 , wherein each aperture is disposed at the inner edge of an end surface or an outer edge of the annular structure. 
   
   
       17 . The fan as claimed in  claim 11 , wherein any two adjacent apertures comprise a partition which can be removed by a tool. 
   
   
       18 . The fan as claimed in  claim 11 , wherein the aperture has a cross section obliquely shaped along the centrifugal direction of the impeller. 
   
   
       19 . The fan as claimed in  claim 11 , further comprising a balance material filled in the aperture to achieve the rotational balance of the impeller. 
   
   
       20 . The fan as claimed in  claim 19 , wherein the balance material is epoxy resin or clay.