Fans with blades having opposing concave surfaces

Abstract

The present invention discloses fan blading devices, systems and methods for implementations with electronic devices to solve the technical problem of poor performance of a fan. Fans comprise a rotating shaft being able to rotate clockwise or counterclockwise, and a plurality of fan blades provided on the rotating shaft driven by rotation of the rotating shaft. All or less the fan blades have a first surface and a second surface opposite to the first surface, each comprising concave areas.

1 . A fan comprising:
 a rotating shaft configured to rotate clockwise or counterclockwise;   a plurality of fan blades each connected at tip ends to the rotating shaft, the fan blades configured thereby to be driven into rotation by the rotating shaft;   at least one of the plurality of fan blades comprising a first surface facing windward with respect to rotation of the plurality of fan blades in a first direction as driven by rotation of the rotating shaft, and a second surface that is opposite to the first surface and thereby leeward with respect to the rotation of the plurality of fan blades in the first direction;   the first surface comprising a first concave area; and   the second surface comprising a second concave area.   
     
     
         2 . The fan of  claim 1 , wherein at least one of the first and the second concave area is a concave cambered surface. 
     
     
         3 . The fan of  claim 1 , wherein a location of the first concave area on the first surface is symmetric with a location of the second concave area in the second surface relative to balance of the at least one fan blade during the rotation of the plurality of fan blades in the first direction. 
     
     
         4 . The fan of  claim 2 , wherein the first concave area comprises a plurality of sub-concave cambered surfaces, and the second concave area comprises a plurality of sub-concave cambered surfaces. 
     
     
         5 . The fan of  claim 2 , wherein a total concave cambered surface area of the first concave cambered surface is equal to a total concave cambered surface area of the second concave cambered surface; wherein a total cut-away volume in the first surface is equal to total cut-away volume in the second surface. 
     
     
         6 . The fan of  claim 2 , wherein the at least one fan blade has a tail end located an end away from the rotating shaft, and wherein the first concave area and the second concave area are located respectively at positions closer to the tail end relative to the tip end of the at least one fan blade. 
     
     
         7 . The fan of  claim 6 , wherein lengths of each of the first concave cambered surface on the first surface and the second concave cambered surface on the second surface are greater than 60% of a total length of the at least one fan blade from the tip end to the tail end. 
     
     
         8 . The fan of  claim 6 , wherein the at least one fan blade tail end comprises a third surface connecting the first surface and the second surface and defining a groove facing away from the rotating shaft 
     
     
         9 . The fan of  claim 8 , wherein the groove is one of a V-shape, a stepped shape, and an arc shape. 
     
     
         10 . The fan of  claim 8 , wherein the groove is located symmetrically with respect to a central longitudinal section between the first surface and the second surface, with the central longitudinal section being a longitudinal section passing through a center of the third surface. 
     
     
         11 . The fan of  claim 8 , wherein the groove comprises a plurality of sub-grooves. 
     
     
         12 . The fan of  claim 8 , wherein the at least one fan blade is a subset every-other plurality of the plurality of fan blades. 
     
     
         13 . The fan of  claim 8 , wherein the at least one fan blade is a totality of the plurality of fan blades. 
     
     
         14 . An electronic device comprising:
 a housing comprising an upper cover, side walls and a base;   an air inlet formed on the housing base;   a rotating shaft disposed within the housing and configured to rotate clockwise or counterclockwise;   a plurality of fan blades each connected at tip ends to the rotating shaft, the fan blades configured thereby to be driven into rotation by the rotating shaft;   at least one of the plurality of fan blades comprising a first surface facing windward with respect to rotation of the plurality of fan blades in a first direction as driven by rotation of the rotating shaft, and a second surface that is opposite to the first surface and thereby leeward with respect to the rotation of the plurality of fan blades in the first direction;   the first surface comprising a first concave area; and   the second surface comprising a second concave area; and   wherein rotation of the plurality of fan blades via the rotating shaft generates wind through a flow channel formed between the fan blades, with the flow channel being a space formed by the upper cover of the housing of the fan, the air inlet on the base, and the side walls of the fan housing.   
     
     
         15 . A method for providing at least one of dust and temperature control within an electronic device, the method comprising:
 rotating a shaft that is disposed within a housing comprising an upper cover, side walls and a base configured clockwise or counterclockwise, wherein a plurality of fan blades are each connected at tip ends to the rotating shaft and are thereby driven into rotation in a first direction as driven by rotation of the rotating shaft, wherein at least one of the plurality of fan blades comprises a first surface facing windward with respect to the rotation of the plurality of fan blades and a second surface that is opposite to the first surface and thereby leeward with respect to the rotation of the plurality of fan blades in the first direction, and wherein the first surface comprises a first concave area and the second surface comprises a second concave area;   the rotating of the plurality of fan blades via the rotating shaft generating wind through a flow channel formed between the fan blades, with the flow channel being a space formed by the upper cover of the housing of the fan, the air inlet on the base, and the side walls of the fan housing.   
     
     
         16 . The method of  claim 15 , wherein at least one of the first and the second concave area is a concave cambered surface. 
     
     
         17 . The method of  claim 15 , wherein a location of the first concave area on the first surface is symmetric with a location of the second concave area in the second surface relative to balance of the at least one fan blade during the rotation of the plurality of fan blades in the first direction. 
     
     
         18 . The method of  claim 15 , wherein the first concave area comprises a plurality of sub-concave cambered surfaces, and the second concave area comprises a plurality of sub-concave cambered surfaces. 
     
     
         19 . The method of  claim 15 , wherein the at least one fan blade comprise a tail end third surface connecting the first surface and the second surface and defining a groove facing away from the rotating shaft. 
     
     
         20 . The method of  claim 15 , wherein the at least one fan blade is a subset every-other plurality of the plurality of fan blades.