Axial flow fan

Abstract

Disclosed is a axial flow fan of an outdoor unit of an air conditioner. The axial flow fan comprises a hub connected with a rotational shaft of a motor; and at least one blade contacting the hub, wherein the blade has a part from the hub to a predetermined portion of the blade among a whole part from the hub to an outer end of the blade, and the other part from the predetermined portion of the blade to the outer end of the blade, the part being equally applied at a predetermined rake angle, and the other part being raised in a direction of a pressure surface of the blade, and wherein a ratio of an inner diameter and an outer diameter of the axial flow fan is between about 0.35 and about 0.4.

1 . An axial flow fan comprising: 
 a hub connected with a rotational shaft of a motor; and    at least one blade contacting the hub,    wherein the blade has a part from the hub to a predetermined portion of the blade among a whole part from the hub to an outer end of the blade, and the other part from the predetermined portion of the blade to the outer end of the blade, the part being equally applied at a predetermined rake angle, and the other part being raised in a direction of a pressure surface of the blade.    
   
   
       2 . An axial flow fan as set forth in  claim 1 , wherein a rake base line of the blade formed within the part from the hub to the predetermined portion of the blade is tilted by the rake angle of about 23 degrees.  
   
   
       3 . An axial flow fan as set forth in  claim 2 , wherein the rake base line of the blade formed on an outer circumferential surface of the hub is tilted by the rake angle between about 20 degrees and about 23 degrees.  
   
   
       4 . An axial flow fan as set forth in  claim 1 , wherein the rake angle begins at the outer end of the blade.  
   
   
       5 . An axial flow fan comprising: 
 a hub connected with a rotational shaft of a motor; and    at least one blade brought into contact with the hub,    wherein a ratio of an inner diameter and an outer diameter of the axial flow fan is between about 0.35 and about 0.4.    
   
   
       6 . An axial flow fan as set forth in  claim 5 , wherein the ratio of the inner diameter and the outer diameter is a value dividing the outer diameter of the axial flow fan by a diameter of the hub.  
   
   
       7 . An axial flow fan as set forth in  claim 5 , wherein the number of the blades is two.  
   
   
       8 . An axial flow fan as set forth in  claim 5 , wherein a solidity has a range of 0.85±0.05.  
   
   
       9 . An axial flow fan as set forth in  claim 5 , wherein the hub has a quantity of a camber of 5.0%±1.0%.  
   
   
       10 . An axial flow fan as set forth in  claim 5 , wherein the outer diameter of the axial flow fan has a range of 460±2 mm.  
   
   
       11 . An axial flow fan as set forth in  claim 5 , wherein the hub has an diameter of a range of 170±2 mm.  
   
   
       12 . An axial flow fan as set forth in  claim 5 , wherein a noise is greatly reduced between about 300 Hz and about 1000 Hz.  
   
   
       13 . An axial flow fan comprising: 
 a hub connected with a rotational shaft of a motor; and    at least two blades disposed around the hub,    wherein the blade has a first section where a rake ange is uniform and a second section where the rake angle is not uniform.    
   
   
       14 . An axial flow fan as set forth in  claim 13 , wherein the first section of the blade is from an inner end of the blade to a predetermined portion of the blade, and the second section of the blade is from the predetermined portion of the blade to an outer end of the blade.