Fan frame structure

Abstract

A fan frame structure includes a frame having a bottom surface, a top surface and a flow passage. The flow passage is located between the bottom surface and the top surface, and the bottom surface and the top surface are provided with an outlet opening and an inlet opening, respectively, which are communicable with the flow passage. The outlet opening has an outlet edge, on and along which a plurality of notches communicable with the flow passage is cut. By providing the notches on the outlet edge, it is able to largely reduce the noise and the vibration produced when a fan operates.

1 . A fan frame structure, comprising:
 a frame having a bottom surface, a top surface and a flow passage; the flow passage being located between the bottom surface and the top surface, and the bottom surface and the top surface being provided with an outlet opening and an inlet opening, respectively, which are communicable with the flow passage; and the outlet opening having an outlet edge, on and along which a plurality of notches communicable with the flow passage is cut.   
     
     
         2 . The fan frame structure as claimed in  claim 1 , wherein the notches are so cut on and along the outlet edge that they are either equally spaced, unequally spaced, or in a staggered arrangement. 
     
     
         3 . The fan frame structure as claimed in  claim 1 , wherein the outlet edge is selected from the group consisting of a surface bent at an angle and a slant surface. 
     
     
         4 . The fan frame structure as claimed in  claim 1 , wherein the notches have a shape selected from the group consisting of a groove, a triangle, a polygon, and an isosceles trapezoid. 
     
     
         5 . The fan frame structure as claimed in  claim 1 , wherein the notches can be cut on the outlet edge in a direction perpendicular to or not perpendicular to the outlet edge. 
     
     
         6 . The fan frame structure as claimed in  claim 1 , further comprising a base located in the flow passage; and the base being supported at the outlet opening and connected to the frame by a plurality of connecting members. 
     
     
         7 . The fan frame structure as claimed in  claim 6 , wherein the connecting members are selected from the group consisting of stationary blades and ribs. 
     
     
         8 . The fan frame structure as claimed in  claim 1 , wherein the flow passage has a fan wheel pivotally rotatably mounted therein. 
     
     
         9 . The fan frame structure as claimed in  claim 1 , wherein the frame has an inner sidewall surface facing toward the flow passage. 
     
     
         10 . The fan frame structure as claimed in  claim 9 , wherein the outlet edge is located between or at a joint of the inner sidewall surface and the bottom surface.