Blower Fan

Abstract

A blower fan includes a housing having a lateral wall defining a compartment. The housing includes an air inlet and an air outlet both in communication with the compartment. An impeller mounted in the compartment includes a hub and blades mounted on the hub. A first plane including opposite first and second end edges in the air outlet is parallel to and spaced from a second plane including a center of the hub. The compartment of the housing includes an air outlet section and a pressure accumulating section on opposite sides of the second plane. The air outlet section is located between the first and second planes. The lateral wall of the housing includes at least one air guiding hole located in the pressure accumulating section. At least one air guiding tube includes an outlet end and an inlet end coupled to the at least one air guiding hole.

1 . A blower fan comprising:
 a housing including a lateral wall defining a compartment, with the housing further including an air inlet and an air outlet both in communication with the compartment, with the air outlet including opposite first and second end edges, with the housing defining a first plane passing the first and second end edges;   an impeller rotatably mounted in the compartment of the housing, with the impeller including a hub and a plurality of blades mounted on an outer periphery of the hub, with the impeller defining a second plane including a center of the hub, with the second plane parallel to and spaced from the first plane; and   at least one air guiding tube including an inlet end and an outlet end,   with the compartment of the housing including an air outlet section and a pressure accumulating section on opposite sides of the second plane, with the air outlet section located between the first and second planes, with the lateral wall of the housing including at least one air guiding hole located in the pressure accumulating section, with the inlet end of said at last one air guiding tube coupled to said at least one air guiding hole.   
     
     
         2 . The blower fan as claimed in  claim 1 , with said at least one air guiding tube including an inner wall tangent to an inner face of the lateral wall of the housing in the pressure accumulating section. 
     
     
         3 . The blower fan as claimed in  claim 1 , with said at least one air guiding tube further including a plurality of branch tubes between the inlet end and the outlet end. 
     
     
         4 . The blower fan as claimed in  claim 1 , with said at least one air guiding hole including an air guiding hole, with said at least one air guiding tube including two air guiding tubes, and with the inlet ends of the two air guiding tubes coupled to the air guiding hole. 
     
     
         5 . The blower fan as claimed in  claim 3 , with said at least one air guiding hole including an air guiding hole, with said at least one air guiding tube including two air guiding tubes, and with the inlet ends of the two air guiding tubes coupled to the air guiding hole. 
     
     
         6 . The blower fan as claimed in  claim 1 , with said at least one air guiding hole including two air guiding holes located in the pressure accumulating section, with said at least one air guiding tube including two air guiding tubes, and with the inlet end of each of the two air guiding tubes coupled to one of the two air guiding holes. 
     
     
         7 . The blower fan as claimed in  claim 3 , with said at least one air guiding hole including two air guiding holes located in the pressure accumulating section, with said at least one air guiding tube including two air guiding tubes, and with the inlet end of each of the two air guiding tubes coupled to one of the two air guiding holes.