Propeller fan and air conditioner having the same

Abstract

An air conditioner includes an outdoor unit that includes a compressor configured to compress a refrigerant, a condenser configured to condense the compressed refrigerant, and a blowing fan configured to blow outdoor air into a room, an indoor unit that discharges air heat-exchanged with the refrigerant flowing-in from the outdoor unit to the room, and a connection piping that connects the outdoor unit and the indoor unit. Here, a plurality of protrusions may be formed at least one side of the blowing fan, and a convex portion and a concave portion may be formed on a surface of the blowing fan so that the surface of the blowing fan is indented.

What is claimed is: 
     
         1 . An air conditioner comprising:
 an outdoor unit configured to compress a refrigerant and to condense the compressed refrigerant, the outdoor unit including a blowing fan configured to blow outdoor air into the outdoor unit;   an indoor unit that discharges air heat-exchanged with the refrigerant flowing-in from the outdoor unit to a room; and   a connection piping that connects the outdoor unit and the indoor unit,   wherein the blowing fan includes a plurality of blades, a plurality of protrusions are formed on at least one side of facing edges of the blade, and a convex portion and a concave portion are formed on a surface of the blowing fan so that the surface of the blowing fan is indented.   
     
     
         2 . The air conditioner according to  claim 1 , wherein the plurality of protrusions are formed on both sides of the facing edges of the blade, 
     
     
         3 . The air conditioner according to  claim 2 , wherein the blowing fan includes a hub fixed to a shaft of a driving motor and the plurality of blades arranged along a circumference of the hub. 
     
     
         4 . The air conditioner according to  claim 3 , wherein the blade includes a trailing edge and a leading edge that leads the trailing edge when rotated with respect to the hub, and the plurality of protrusions are formed so as to protrude from both sides of the leading edge and the trailing edge. 
     
     
         5 . The air conditioner according to  claim 4 , wherein the protrusion is formed so as to protrude forward of the leading edge. 
     
     
         6 . The air conditioner according to  claim 4 , wherein the protrusion is formed so as to protrude backward of the trailing edge. 
     
     
         7 . The air conditioner according to  claim 4 , wherein the plurality of protrusions are formed on the leading edge, and the plurality of protrusions are formed on the trailing edge so as to correspond to the protrusions formed on the leading edge. 
     
     
         8 . The air conditioner according to  claim 7 , wherein the convex portion is formed so as to connect the protrusions formed on the leading edge and the trailing edge. 
     
     
         9 . The air conditioner according to  claim 8 , wherein the concave portion is formed between the convex portions adjacent to each other. 
     
     
         10 . The air conditioner according to  claim 1 , wherein each of the plurality of protrusions is formed in a range of 1.3% to 6.6% of a length of the blade. 
     
     
         11 . The air conditioner according to  claim 1 , wherein a height of the convex portion is formed in a range of 0.5% to 6.0% of a length of the blade. 
     
     
         12 . The air conditioner according to  claim 1 , wherein the number of the formed protrusions is at least three. 
     
     
         13 . A propeller fan comprising:
 a hub configured to receive a rotational force; and   a plurality of blades radially arranged on a circumference of the hub,   wherein a surface of the blade is indented, and a plurality of protrusions are formed on at least one of a leading edge and a trailing edge of the blade.   
     
     
         14 . The propeller fan according to  claim 13 , wherein the plurality of protrusions are formed on both the leading edge and the trailing edge of the blade. 
     
     
         15 . The propeller fan according to  claim 14 , wherein the plurality of protrusions are formed to have irregular sizes. 
     
     
         16 . The propeller fan according to  claim 14 , wherein a convex portion is formed on the surface of the blade so as to connect the protrusions formed on the leading edge and the protrusions formed on the trailing edge so as to correspond to the protrusions of the leading edge. 
     
     
         17 . The propeller fan according to  claim 16 , wherein the number of the convex portions is plural, and a height of the convex portion is irregularly formed. 
     
     
         18 . The propeller fan according to  claim 13 , wherein a protruding length of each of the plurality of protrusions is formed in a range of 1.3% to 6.6% of a length of the blade. 
     
     
         19 . The propeller fan according to  claim 13 , wherein a height of the convex portion is formed in a range of 0.5% to 6.0% of a length of the blade. 
     
     
         20 . The propeller fan according to  claim 13 , wherein the blade is formed to be inclined so as to blow air from a rear side of the blade toward a front side thereof along an axial direction of the hub.