Centrifugal fan and fan frame thereof

Abstract

A fan frame includes a first housing and a second housing. The first housing has at least one first inlet, and the second housing has at least one second inlet. The combination of the first housing and the second housing forms two independent airflow passages, at least one first outlet and at least one second outlet. A centrifugal fan including the fan frame is also disclosed.

1 . A fan, comprising: 
 a fan frame having a first housing and a second housing, wherein the first housing has at least one first inlet, the second housing has at least one second inlet, and the combination of the first housing and the second housing forms two independent airflow passages, at least one first outlet and at least one second outlet; and    an impeller disposed in the fan frame and comprising at least one hub, at least one first blade and at least one second blade, wherein the first blade and the second blade respectively correspond to the two independent airflow passages.    
   
   
       2 . The fan according to  claim 1 , further comprising a separation part disposed between the first housing and the second housing to form the independent airflow passages, the first outlet and the second outlet.  
   
   
       3 . The fan according to  claim 2 , wherein the separation part and the first housing or the separation part and the second housing are integrally formed as a single piece.  
   
   
       4 . The fan according to  claim 2 , wherein the separation part, the first housing and the second housing are independently formed.  
   
   
       5 . The fan according to  claim 2 , wherein the separation part is an enclosing board or a board with an enclosing wall.  
   
   
       6 . The fan according to  claim 2 , further comprising a motor connecting and driving the impeller, wherein the motor is disposed on the first housing, the second housing or the separation part.  
   
   
       7 . The fan according to  claim 1 , further comprising a motor connecting and driving the impeller, wherein the motor is disposed on the first housing or the second housing.  
   
   
       8 . The fan according to  claim 1 , wherein the second housing has a base with the second inlet, a bushing and at least one connecting part connected with the base and the bushing.  
   
   
       9 . The fan according to  claim 8 , wherein the connecting part is a rib, an air-guiding plate or a stationary blade.  
   
   
       10 . The fan according to  claim 1 , wherein the airflow directions or rates of the independent airflow passages are the same or different.  
   
   
       11 . The fan according to  claim 1 , wherein the hub, the first blade and the second blade are independently formed or integrally formed as a single piece.  
   
   
       12 . The fan according to  claim 1 , wherein the impeller further comprises at least one separation board connected to the hub, the first blade and the second blade, and disposed between the two independent airflow passages.  
   
   
       13 . The fan according to  claim 12 , wherein the separation board, the hub, the first blade and the second blade are independently formed or integrally formed as a single piece.  
   
   
       14 . The fan according to  claim 1 , wherein the impeller further comprises a first separation board and a second separation board, wherein the first separation board connects to the hub and the first blade, the second separation board connects to the hub and the second blade, and the first separation board and the second separation board are disposed between the two independent airflow passages.  
   
   
       15 . The fan according to  claim 14 , wherein the first separation board, the second separation board, the hub, the first blade and the second blade are independently formed or integrally formed as a single piece.  
   
   
       16 . The fan according to  claim 14 , wherein a gap exists between the first separation board and the second separation board.  
   
   
       17 . The fan according to  claim 14 , further comprising a separation part disposed between the first separation board and the second separation board, wherein the separation part is connected to the first housing and the second housing.  
   
   
       18 . The fan according to  claim 1 , wherein the shape, quantity, pitch or tilt angle of the first blade and the second blade are the same or different.  
   
   
       19 . The fan according to  claim 1 , wherein the airflow directions of the independent airflow passages are perpendicular, parallel, anti-parallel to each other or subtend an angle.  
   
   
       20 . A fan frame of a fan, comprising: 
 a first housing having at least one first inlet; and    a second housing having at least one second inlet, wherein the combination of the first housing and the second housing forms two independent airflow passages, at least one first outlet and at least one second outlet.