Impeller structure

Abstract

An impeller structure includes a hub, a plurality of blades, and a plurality of reinforcing ribs. The blades are extended from the hub, and the reinforcing ribs are disposed annularly and separately between the blades. The strength of the impeller structure is improved by the reinforcing ribs, and the interference between the inner and outer flow fields of the blades is reduced by the reinforcing ribs. Also, a fan including above-mentioned impeller structure is disclosed.

1 . An impeller structure, comprising:
 a hub, rotated about a rotation axis, having an outer surface;   a plurality of blades extended from the outer surface, wherein each of the blades has a windward surface and a leeward surface opposite to the windward surface, and each of the blades has a side edge, a connecting edge opposite to the side edge, a trailing edge, and a leading edge opposite to the trailing edge, wherein the side edge is distant from the hub, and the connecting edge is connected to the hub; and   a plurality of reinforcing ribs, annularly and separately disposed on the blades, located between the side edges and the connecting edges of the blades,   wherein an end of one of the reinforcing ribs is connected to the windward surface of one of the blades, and the other end of the one of the reinforcing ribs is connected to a leeward surface of an adjacent blade,   wherein the end of the one of the reinforcing ribs is adjacent to the leading edge of the blade and is distant from the trailing edge of the blade, and the other end of the one of the reinforcing ribs is adjacent to a trailing edge of the adjacent blade and is distant from a leading edge of the adjacent blade.   
     
     
         2 . The impeller structure as claimed in  claim 1 , wherein the width of each of the reinforcing ribs is smaller than half of a wing-tip chord length of each of the blades. 
     
     
         3 . The impeller structure as claimed in  claim 1 , wherein the reinforcing rib is connected to the blade at an area from one-third to two-third of the blade  220 . 
     
     
         4 . The impeller structure as claimed in  claim 1 , wherein the reinforcing ribs are perpendicular to the blades, respectively. 
     
     
         5 . The impeller structure as claimed in  claim 1 , wherein the cross section of each of the reinforcing ribs is rectangular, rectangular with rounded ends, an ellipse, a trapezoid, or wing shaped. 
     
     
         6 . The impeller structure as claimed in  claim 1 , wherein the leading edge of the blade is near the trailing edge of the adjacent blade, and is distant from the leading edge of the adjacent blade. 
     
     
         7 . An impeller structure, comprising:
 a hub, rotated about a rotation axis, having an outer surface;   a plurality of sub-blades radiantly extended from the outer surface of the hub, respectively;   a separation ring disposed on the end of the sub-blades;   a plurality of blades extended from the separation ring opposite to the sub-blades, wherein each of the blades has a windward surface and a leeward surface opposite to the windward surface, and each of the blades has a side edge, a connecting edge opposite to the side edge, a trailing edge, and a leading edge opposite to the trailing edge, wherein the side edge is distant from the separation ring, and the connecting edge is connected to the separation ring; and   a plurality of reinforcing ribs, annularly and separately disposed on the blades, located between the side edges and the connecting edges of the blades,   wherein an end of one of the reinforcing ribs is connected to the windward surface of one of the blades, and the other end of the one of the reinforcing ribs is connected to a leeward surface of an adjacent blade, and   wherein the end of the one of the reinforcing ribs is adjacent to the leading edge of the blade and is distant from the trailing edge of the blade, and the other end of the one of the reinforcing ribs is adjacent to a trailing edge of the adjacent blade and is distant from a leading edge of the adjacent blade.   
     
     
         8 . The impeller structure as claimed in  claim 7 , wherein the width of each of the reinforcing ribs is smaller than half of a wing-tip chord length of each of the blades. 
     
     
         9 . The impeller structure as claimed in  claim 7 , wherein the reinforcing rib is connected to the blade at an area from one-third to two-third of the blade  220 . 
     
     
         10 . The impeller structure as claimed in  claim 7 , wherein the reinforcing ribs are perpendicular to the blades, respectively. 
     
     
         11 . The impeller structure as claimed in  claim 7 , wherein the cross section of each of the reinforcing ribs is rectangular, rectangular with rounded ends, an ellipse, a trapezoid, or wing shaped. 
     
     
         12 . The impeller structure as claimed in  claim 7 , wherein the leading edge of the blade is near the trailing edge of the adjacent blade, and is distant from the leading edge of the adjacent blade. 
     
     
         13 . The impeller structure as claimed in  claim 7 , wherein the length of each of the sub-blades is smaller than the length of each of the blades, and the number of the sub-blades is greater than the number of the blades. 
     
     
         14 . A fan, comprising an impeller structure, the impeller structure comprising:
 a hub, rotated about a rotation axis, having an outer surface;   a plurality of blades extended from the outer surface, wherein each of the blades has a windward surface and a leeward surface opposite to the windward surface, and each of the blades has a side edge, a connecting edge opposite to the side edge, a trailing edge, and a leading edge opposite to the trailing edge, wherein the side edge is distant from the hub, and the connecting edge is connected to the hub; and   a plurality of reinforcing ribs, annularly and separately disposed on the blades, located between the side edges and the connecting edges of the blades,   wherein an end of one of the reinforcing ribs is connected to the windward surface of one of the blades, and the other end of the one of the reinforcing ribs is connected to a leeward surface of an adjacent blade,   wherein the end of the one of the reinforcing ribs is adjacent to the leading edge of the blade and is distant from the trailing edge of the blade, and the other end of the one of the reinforcing ribs is adjacent to a trailing edge of the adjacent blade and is distant from a leading edge of the adjacent blade.   
     
     
         15 . The fan as claimed in  claim 14 , wherein the width of each of the reinforcing ribs is smaller than half of a wing-tip chord length of each of the blades. 
     
     
         16 . The fan as claimed in  claim 14 , wherein the reinforcing rib is connected to the blade at an area from one-third to two-third of the blade. 
     
     
         17 . The fan as claimed in  claim 14 , wherein the reinforcing ribs are perpendicular to the blades, respectively. 
     
     
         18 . The fan as claimed in  claim 14 , wherein the cross section of each of the reinforcing ribs is rectangular, rectangular with rounded ends, an ellipse, a trapezoid, or wing shaped. 
     
     
         19 . The fan as claimed in  claim 14 , wherein the leading edge of the blade is near the trailing edge of the adjacent blade, and is distant from the leading edge of the adjacent blade.