Centrifugal fan impeller structure

Abstract

A centrifugal fan impeller structure includes a hub and a second annular body. The hub has an extension section. A first annular body is connected to a free end of the extension section. The first annular body has a first side and a second side. A first blade set is disposed on the first side. The second annular body has a third side and a fourth side. A second blade set is disposed on the third side. The fourth side is mated and connected with the second side. The centrifugal fan impeller structure is able to greatly increase air volume and wind pressure of the fan. Moreover, in operation, the centrifugal fan impeller structure makes less noise.

What is claimed is: 
     
         1 . A centrifugal fan impeller structure comprising:
 a hub having an extension section, a first annular body being connected to a free end of the extension section, the first annular body having a first side and a second side, a first blade set being disposed on the first side, the first blade set including multiple first blade bodies;   a second annular body having a third side and a fourth side, a second blade set being disposed on the third side, the second blade set including multiple second blade bodies, the fourth side being mated and connected with the second side.   
     
     
         2 . The centrifugal fan impeller structure as claimed in  claim 1 , wherein each first blade body has a first end and a second end and each second blade body has a third end and a fourth end, each two adjacent first blade bodies defining therebetween a first flow way, each two adjacent second blade bodies defining therebetween a second flow way. 
     
     
         3 . The centrifugal fan impeller structure as claimed in  claim 1 , wherein the first blade set extends away from the first annular body by a first length and the second blade set extends away from the second annular body by a second length, the first length being shorter than the second length. 
     
     
         4 . The centrifugal fan impeller structure as claimed in  claim 1 , wherein the number of the first blade bodies is equal to the number of the second blade bodies. 
     
     
         5 . The centrifugal fan impeller structure as claimed in  claim 2 , wherein the height of the second end of the first blade body is larger than the height of the fourth end of the second blade body. 
     
     
         6 . The centrifugal fan impeller structure as claimed in  claim 2 , wherein the height of the fourth end of the second blade body is larger than the height of the second end of the first blade body. 
     
     
         7 . The centrifugal fan impeller structure as claimed in  claim 1 , wherein each first blade body has a first end and a second end and each second blade body has a third end and a fourth end, the first end of the first blade body being misaligned with the third end of the second blade body, each two adjacent first blade bodies defining therebetween a first flow way, each two adjacent second blade bodies defining therebetween a second flow way, the first flow way having a first wind inlet end and a first wind outlet end, the second flow way having a second wind inlet end and a second wind outlet end, the first wind inlet end being misaligned with the second wind inlet end. 
     
     
         8 . The centrifugal fan impeller structure as claimed in  claim 1 , wherein each first blade body has a first end and a second end and each second blade body has a third end and a fourth end, the first end of the first blade body being aligned with the third end of the second blade body, the first flow way having a first wind inlet end and a first wind outlet end, the second flow way having a second wind inlet end and a second wind outlet end, the first wind inlet end being aligned with the second wind inlet end. 
     
     
         9 . The centrifugal fan impeller structure as claimed in  claim 1 , wherein the second side of the first annular body has a reception section, the reception section including a first reception socket set and a second reception socket set, the fourth side of the second annular body having multiple boss bodies, whereby the boss bodies can be selectively correspondingly inserted into the first reception socket set or the second reception socket set. 
     
     
         10 . The centrifugal fan impeller structure as claimed in  claim 1 , wherein the number of the first blade bodies is unequal to the number of the second blade bodies.