Vacuum cleaner

Abstract

A vacuum cleaner including an intake portion within a main body, wherein the intake portion includes an impeller to draw in air while rotating about a shaft, and a plurality of diffuser vanes to guide air discharged from the impeller, wherein each of the diffuser vanes includes a single vane body having an airfoil shape in cross section, and a passage to cross through at least a portion of the vane body. The vacuum cleaner is capable of effectively changing the direction of a flow flowing into a diffuser, and reducing losses caused by flow separation.

What is claimed is: 
     
         1 . A vacuum cleaner comprising;
 a main body; and   an intake portion in the main body, the intake portion comprising:
 a shaft; 
 an impeller configured to draw in air while rotating about the shaft, and 
 a plurality of diffuser vanes configured to guide the air discharged from the impeller, 
   wherein each of the plurality of diffuser vanes includes:
 a single vane body having an airfoil shape in cross section; and 
 a passage configured to cross through at least a portion of the vane body. 
   
     
     
         2 . The vacuum cleaner of  claim 1 , wherein the vane body comprises:
 a first surface;   a second surface forming a rear surface of the first surface, and   wherein the passage is configured to connect the first surface and the second surface by penetrating therebetween.   
     
     
         3 . The vacuum cleaner of  claim 2 , wherein the passage includes:
 an entry portion formed on the second surface; and   an exit portion connected to the entry portion and formed on the first surface.   
     
     
         4 . The vacuum cleaner of  claim 3 , wherein the passage is configured to be inclined with respect to an axial direction of the impeller. 
     
     
         5 . The vacuum cleaner of  claim 3 , wherein the entry portion and the exit portion have different positions in a thickness direction of the diffuser vane. 
     
     
         6 . The vacuum cleaner of  claim 5 , wherein the entry portion and the exit portion have different positions in a width direction of the diffuser vane. 
     
     
         7 . The vacuum cleaner of  claim 6 , wherein an angle of the exit portion corresponds to a tangential direction of the first surface. 
     
     
         8 . The vacuum cleaner of  claim 6 , wherein a length of the entry portion is greater than a length of the exit portion. 
     
     
         9 . The vacuum cleaner of  claim 6 , wherein the passage further includes a curved portion having a curvature at least in part.