Turbofan and air conditioner having the same

Abstract

A turbofan to reduce a blowing noise, and an air conditioner having the same. The turbofan includes a rotating plate coupled to a shaft of a driving motor, a plurality of blades coupled to an outer circumference of the rotating plate, and an annular shroud coupled to an end of each blade. The end of each blade includes an inner end that is coupled to the rotating plate, and an outer end that is not coupled to the rotating plate. The outer end of each blade is tilted toward the rotating plate such that a distance between the outer end of each blade and an inner surface of an apparatus employing the turbofan is increased as the outer end of each blade moves away from a rotational center of the rotating plate in a radial outward direction.

1 . A turbofan, comprising;
 a rotating plate coupled to a shaft of a driving motor;   a plurality of blades coupled to an outer circumference of the rotating plate; and   an annular shroud coupled to an end of each blade, the end of each blade including an inner end that is coupled to the rotating plate, and an outer end that is not coupled to the rotating plate,   wherein the outer end of each blade is tilted toward the rotating plate such that a distance between the outer end of each blade and an inner surface of an apparatus employing the turbofan increases as the outer end of each blade moves away from a rotational center of the rotating plate in a radial outward direction.   
   
   
       2 . The turbofan of  claim 1 , wherein the outer end of each blade has a tilt angle of about 5 degrees to about 15 degrees with respect to the rotating plate. 
   
   
       3 . The turbofan of  claim 2 , wherein the rotating plate, the blades, and the shroud are integrally formed. 
   
   
       4 . An air conditioner, comprising:
 a main body case;   a driving motor fixed to an inner surface of the main body case;   a turbofan coupled to a shaft of the driving motor; and   a heat exchanger installed around the turbofan in the main body case,   wherein the turbofan includes a rotating plate coupled to the shaft of the driving motor, a plurality of blades coupled to an outer circumference of the rotating plate, and an annular shroud coupled to an end of each blade wherein the end of each blade includes an inner end that is coupled to the rotating plate, and an outer end that is not coupled to the rotating plate, and   wherein the outer end of each blade is tilted toward the rotating plate such that a distance between the outer end of each blade and an inner surface of the main body case is increased as the outer end of each blade moves away from a rotational center of the rotating plate in a radial outward direction.   
   
   
       5 . The air conditioner of  claim 4 , wherein the outer end of each blade has a tilt angle of about 5 degrees to about 15 degrees with respect to the rotating plate. 
   
   
       6 . The air conditioner of  claim 5 , wherein the rotating plate, the blades, and the shroud are integrally formed. 
   
   
       7 . A turbofan assembly, comprising:
 a main body;   a rotating plate coupled to an inner surface of the main body to rotate on an axis perpendicular to the inner surface; and   a plurality of blades coupled to an outer circumference of the rotating plate, each of the plurality of blades including a side closest to the inner surface of the main body which gradually slopes away from the inner surface of the main body as the side extends away from the rotating plate.   
   
   
       8 . A turbofan assembly, comprising:
 a main body;   a rotating plate coupled to an inner surface of the main body to rotate on an axis perpendicular to the inner surface; and   a plurality of blades each having an inner side with respect to the main body that includes a first end coupled to an outer circumference of the rotating plate and a second end which is at a distance further from the inner surface of the main body than the first end.   
   
   
       9 . An air conditioner, comprising:
 a main body case;   a driving motor fixed to an inner surface of the main body case;   a rotating plate coupled to the driving motor to rotate on an axis perpendicular to the inner surface of the main body case; and   a plurality of blades coupled to an outer circumference of the rotating plate, each of the plurality of blades including a side closest to the inner surface of the main body case which gradually slopes away from the inner surface of the main body case as the side extends away from the rotating plate.