Heat-dissipating fan unit

Abstract

A heat-dissipating fan unit includes a fan housing having first and second wall portions opposite to each other. An air guide member is mounted on the first wall portion of the fan housing and is registered with an air inlet formed in the first wall portion. The air guide member is formed with a plurality of vent holes, each of which is in fluid communication with the air inlet of the fan housing. Each of the vent holes is confined by a tubular wall that extends in a direction perpendicular to the first wall portion of the fan housing. A fan is disposed in the fan housing and is operable so as to draw air into the fan housing via the vent holes and the air inlet and to expel air in the fan housing via an air outlet formed in the second wall portion.

We claim:  
     
         1 . A heat-dissipating fan unit, comprising: 
 a fan housing having first and second wall portions opposite to each other, said first wall portion being formed with an air inlet, said second wall portion being formed with an air outlet;    an air guide member mounted on said first wall portion of said fan housing and registered with said air inlet of said fan housing, said air guide member being formed with a plurality of vent holes, each of which is in fluid communication with said air inlet of said fan housing, each of said vent holes being confined by a tubular wall that extends in a direction perpendicular to said first wall portion of said fan housing; and    a fan disposed in said fan housing, said fan being operable so as to draw air into said fan housing via said vent holes and said air inlet and to expel air in said fan housing via said air outlet.    
     
     
         2 . The heat-dissipating fan unit as claimed in  claim 1 , wherein said tubular walls of said vent holes are in close contact with each other and are polygonal in cross-section.  
     
     
         3 . The heat-dissipating fan unit as claimed in  claim 2 , wherein said air guide member includes a plurality of guide plates, each of which is made from extended aluminum, each of said guide plates cooperating with an adjacent one of said guide plates to define said tubular walls of a series of said vent holes.  
     
     
         4 . The heat-dissipating fan unit as claimed in  claim 1 , wherein said air guide member has a honeycomb structure, and said tubular walls of said vent holes are hexagonal in cross-section.  
     
     
         5 . The heat-dissipating fan unit as claimed in  claim 3 , wherein said air guide member includes a plurality of guide plates, each of said guide plates cooperating with an adjacent one of said guide plates to define said tubular walls of a series of said vent holes.  
     
     
         6 . The heat-dissipating fan unit as claimed in  claim 1 , wherein said fan is an axial fan.  
     
     
         7 . The heat-dissipating fan unit as claimed in  claim 1 , wherein said fan is a centrifugal fan.  
     
     
         8 . The heat-dissipating fan unit as claimed in  claim 1 , wherein said tubular wall of each of said vent holes is coated with a sound damping layer.