Air conditioner

Abstract

An air conditioner includes a fan and a rear guide which guides air to the fan. A recess is formed in a side surface of the rear guide which faces the fan.

1 . An air conditioner, comprising:
 a fan; and   a rear guide which guides air to the fan,   wherein a recess is formed in a side surface of the rear guide which faces the fan.   
   
   
       2 . The air conditioner according to  claim 1 , wherein the recess extends from a portion of the rear guide which is closest to the fan to an end of the rear guide. 
   
   
       3 . The air conditioner according to  claim 1 , wherein the recess is inclined, at an angle of approximately 4-6 degrees, relative to a line tangential to a surface of the rear guide at a portion of the rear guide which is closest to the fan. 
   
   
       4 . The air conditioner according to  claim 1 , wherein a ratio of a diameter D of the fan to a depth d of the recess is approximately 0.01≦d/D≦0.015. 
   
   
       5 . The air conditioner according to  claim 1 , wherein a ratio of a diameter D of the fan to a thickness t of a portion of the rear guide at which the recess is formed is approximately 0.4≦t/D≦0.5. 
   
   
       6 . The air conditioner according to  claim 1 , wherein a ratio of a diameter D of the fan to a length L of the recess is approximately 0.14≦L/D≦0.18. 
   
   
       7 . The air conditioner according to  claim 1 , wherein a bell mouth portion extending in a direction opposite to the fan is formed at an end of the rear guide.