Heat dissipation module with noise reduction

Abstract

A dissipation device has a dissipation fin set and a centrifugal fan. The centrifugal fan outputs airflow toward the dissipation fin set to remove the heat from it. The centrifugal fan includes a centrifugal impeller mounted on a motor. An outer housing houses the motor and the centrifugal impeller. An inner wall of the housing's outlet has hair structure to reduce noise. The dissipation fin set includes a fin structure closely attached to a heat source, as well as an airflow channel housing. The airflow channel also includes a hair structure for reducing noise.

1 . A centrifugal fan with a noise reduction function, comprising: 
 a centrifugal impeller; and    an outer housing, said centrifugal impeller being housed inside, said outer housing comprising:    an inlet, positioned along an axial direction of said centrifugal impeller;    an outlet, positioned along a radial direction of said centrifugal impeller; and    a hair structure, positioned on an inner sidewall of said outlet to reduce noise.    
   
   
       2 . The centrifugal fan of  claim 1 , wherein an inner, cross-sectional diameter of said outlet is about 0.5 to 1.0 times a noise wavelength.  
   
   
       3 . The centrifugal fan of  claim 1 , wherein said hair structure is made of Nylon or artificial fiber.  
   
   
       4 . The centrifugal fan of  claim 1 , wherein said hair structure is attached to said inner sidewall of said outlet by glue.  
   
   
       5 . The centrifugal fan of  claim 1 , wherein a performance of noise reduction varies as a function of length, density or flexibility of said hair structure.  
   
   
       6 . A heat dissipation module with a noise reduction function, comprising: 
 a dissipation fin set, closely attached to a heat source;    a airflow channel housing, securing said dissipation fin set and the heat source inside, wherein said airflow channel housing includes a first inlet, a first outlet and a first hair structure, positioned on a inner sidewall of said airflow channel housing to reduce noise; and    an outer housing, a centrifugal impeller being housed inside, said outer housing comprising: 
 a second inlet, positioned along an axial direction of said centrifugal impeller;  
 a second outlet, positioned along a radial direction of said centrifugal impeller, wherein air driven by said centrifugal impeller is guided out of said second outlet and guided into said first inlet; and  
 a second hair structure, positioned on a inner sidewall of said second outlet to reduce noise.  
   
   
   
       7 . The heat dissipation module of  claim 6 , wherein an inner, cross-sectional diameter of said second outlet is about 0.5 to 1.0 times a noise wavelength.  
   
   
       8 . The heat dissipation module of  claim 6 , wherein an inner, cross-sectional diameter of said airflow channel housing is about 0.5 to 1.0 times a noise wavelength.  
   
   
       9 . The heat dissipation module of  claim 6 , wherein said first and second hair structures are made of Nylon or artificial fiber.  
   
   
       10 . The heat dissipation module of  claim 6 , wherein said first hair structure is attached to said inner sidewall of said airflow channel housing by glue.  
   
   
       11 . The heat dissipation module of  claim 6 , wherein said second hair structure is attached to said inner sidewall of said second outlet by glue.  
   
   
       12 . The heat dissipation module of  claim 6 , wherein a performance of noise reduction varies as a function of length, density or flexibility of said first hair structure.  
   
   
       13 . The heat dissipation module of  claim 6 , wherein a performance of noise reduction varies as a function of length, density or flexibility of said second hair structure.