Fan assembly and heat dissipation device including the same

Abstract

A fan assembly is provided. The fan assembly includes a hub, a plurality of fan blades, and a fluid-guiding structure. The fan blades surround the hub. The fluid-guiding structure connects any two adjacent fan blades. Each of the fan blades includes a first end connected to the hub and a second end opposite to the first end. The distance between the fluid-guiding structure and the second end is less than the distance between the fluid-guiding structure and the first end. The fluid-guiding structure includes at least one streamlined surface.

What is claimed is: 
     
         1 . A fan assembly, comprising:
 a hub;   a plurality of fan blades surrounding the hub; and   a fluid-guiding structure connecting any two adjacent fan blades to each other,   wherein each of the fan blades includes a first end connected to the hub and a second end opposite to the first end, a distance between the fluid-guiding structure and the second end is less than a distance between the fluid-guiding structure and the first end, and the fluid-guiding structure includes at least one streamlined surface.   
     
     
         2 . The fan assembly as claimed in  claim 1 , wherein the fluid-guiding structure comprises a first surface and a second surface intersecting each other at two intersecting lines. 
     
     
         3 . The fan assembly as claimed in  claim 2 , wherein one of the first surface and the second surface is a flat surface, and the other one of the first surface and the second surface is a streamlined surface. 
     
     
         4 . The fan assembly as claimed in  claim 2 , wherein a first mean curvature of the first surface is different from a second mean curvature of the second surface. 
     
     
         5 . The fan assembly as claimed in  claim 4 , wherein a fluid flows toward the fluid-guiding structure from the hub, a first pressure is generated when the fluid flows through the first surface, a second pressure is generated when the fluid flows through the second surface, and the first pressure is different from the second pressure. 
     
     
         6 . The fan assembly as claimed in  claim 2 , wherein both the first surface and the second surface are streamlined surfaces. 
     
     
         7 . The fan assembly as claimed in  claim 6 , wherein a first mean curvature of the first surface is equal to a second mean curvature of the second surface. 
     
     
         8 . The fan assembly as claimed in  claim 1 , further comprising a shaft having an axial direction, wherein when viewed along the axial direction, the fluid-guiding structure is ring-shaped. 
     
     
         9 . The fan assembly as claimed in  claim 8 , wherein when viewed along the axial direction, the fluid-guiding structure surrounds the hub. 
     
     
         10 . The fan assembly as claimed in  claim 8 , further comprising an abrasion-resistant element, wherein the shaft abuts the abrasion-resistant element. 
     
     
         11 . The fan assembly as claimed in  claim 1 , wherein an inner axial size of an inner portion of the fan blades that is relatively close to the hub is different from an outer axial size of an outer portion of the fan blades. 
     
     
         12 . The fan assembly as claimed in  claim 11 , wherein the inner axial size of the inner portion of the fan blades that is relatively close to the hub is less than the outer axial size of the outer portion of the fan blades. 
     
     
         13 . The fan assembly as claimed in  claim 1 , wherein the fan blades and the fluid-guiding structure are formed integrally. 
     
     
         14 . The fan assembly as claimed in  claim 1 , wherein the fan blades are equally spaced apart from each other. 
     
     
         15 . A heat dissipation device, comprising:
 a casing;   a fan frame connected to the casing; and   the fan assembly as claimed in  claim 1 , wherein the fan assembly is disposed in the fan frame.   
     
     
         16 . The heat dissipation device as claimed in  claim 15 , wherein the casing comprises a front casing and a rear casing, and the fan frame is disposed between the front casing and the rear casing. 
     
     
         17 . The heat dissipation device as claimed in  claim 16 , wherein the fluid-guiding structure is relatively close to the rear casing and relatively far away from the front casing. 
     
     
         18 . The heat dissipation device as claimed in  claim 15 , wherein the fluid-guiding structure comprises a first surface and a second surface intersecting each other at two intersecting lines. 
     
     
         19 . The heat dissipation device as claimed in  claim 18 , wherein the first surface is a flat surface, and the second surface is a streamlined surface. 
     
     
         20 . The heat dissipation device as claimed in  claim 18 , wherein both the first surface and the second surface are streamlined surfaces.