Fan impeller structure and cooling fan thereof

Abstract

A fan impeller structure and a cooling fan thereof. The fan impeller structure includes a hub and a flow guide body. The hub has an extension section extending from outer circumference of the hub. The extension section has a first face and a second face. An axial center of the flow guide body is defined with an axial line. A fitting section outward extends from the axial line. A spoiler section is connected to the fitting section in a direction away from the axial line. The spoiler section is formed with multiple axial perforations and multiple radial perforations. The flow guide body is disposed on the first face or the second face of the extension section of the hub. The flow guide body is employed to replace the blades of conventional cooling fan. The perforations of the flow guide body can forcedly guide air in a narrow space.

What is claimed is: 
     
         1 . A fan impeller structure comprising:
 a hub; and   a flow guide body, an axial center of the flow guide body being defined with an axial line, a fitting section outward extending from the axial line, a spoiler section being connected to the fitting section in a direction away from the axial line, the spoiler section being formed with multiple axial perforations and multiple radial perforations, the flow guide body being fitted around the hub via the fitting section.   
     
     
         2 . The fan impeller structure as claimed in  claim 1 , wherein the flow guide body is selected from a group consisting of foamed porous structure body, sponge, porous wooden material and foamed metal. 
     
     
         3 . The fan impeller structure as claimed in  claim 1 , wherein a shaft is inserted in the hub. 
     
     
         4 . The fan impeller structure as claimed in  claim 1 , wherein the axial perforations and radial perforations of the spoiler section communicate with each other. 
     
     
         5 . The fan impeller structure as claimed in  claim 1 , wherein the flow guide body has the form of a circular disc body or an elliptic disc body or a geometric plate body. 
     
     
         6 . A fan impeller structure comprising:
 a hub, the hub having an extension section extending from outer circumference of the hub, the extension section having a first face and a second face; and   a flow guide body, an axial center of the flow guide body being defined with an axial line, a fitting section outward extending from the axial line, a spoiler section being connected to the fitting section in a direction away from the axial line, the spoiler section being formed with multiple axial perforations and multiple radial perforations, the flow guide body being disposed on the first face or the second face of the extension section of the hub.   
     
     
         7 . The fan impeller structure as claimed in  claim 6 , wherein the flow guide body is selected from a group consisting of foamed porous structure body, sponge, porous wooden material and foamed metal. 
     
     
         8 . The fan impeller structure as claimed in  claim 6 , wherein a shaft is inserted in the hub. 
     
     
         9 . The fan impeller structure as claimed in  claim 6 , wherein the axial perforations and radial perforations of the spoiler section communicate with each other. 
     
     
         10 . The fan impeller structure as claimed in  claim 6 , wherein the flow guide body has the form of a circular disc body or an elliptic disc body or a geometric plate body. 
     
     
         11 . The fan impeller structure as claimed in  claim 6 , wherein a recess is formed between the fitting section of the flow guide body and the outer circumference of the hub. 
     
     
         12 . The fan impeller structure as claimed in  claim 11 , wherein an inward recessed section is formed at a junction between the fitting section of the flow guide body and the spoiler section. 
     
     
         13 . A cooling fan comprising:
 a fan frame body having a bottom side, a bearing cup being vertically disposed on the bottom side, a wall section partially vertically extending from a periphery of the bottom side, a part of the periphery of the bottom side that is free from the wall section having an outlet;   a bearing having a shaft hole, the bearing being received in the bearing cup;   a hub, the hub having an extension section extending from outer circumference of the hub, the extension section having a first face and a second face, a magnetic member being disposed on inner circumference of the hub, a shaft being inserted in an inner end face of the hub;   a flow guide body, an axial center of the flow guide body being defined with an axial line, a fitting section outward extending from the axial line, a spoiler section being connected to the fitting section in a direction away from the axial line, the spoiler section being formed with multiple axial perforations and multiple radial perforations, the flow guide body being disposed on the first face or the second face of the extension section of the hub;   a stator assembly fitted around the bearing cup; and   a cover body, one side of the cover body being formed with an inlet, the cover body being connected with the wall section of the fan frame body.   
     
     
         14 . The cooling fan as claimed in  claim 13 , wherein the stator assembly includes multiple silicon steel sheets and multiple windings wound around the silicon steel sheets. 
     
     
         15 . The cooling fan as claimed in  claim 13 , wherein the flow guide body has the form of a circular disc body or an elliptic disc body or a geometric plate body. 
     
     
         16 . The cooling fan as claimed in  claim 13 , wherein the flow guide body is selected from a group consisting of foamed porous structure body, sponge, porous wooden material and foamed metal.