Turbo fan for blowing and refrigerator having the same

Abstract

A turbofan for blowing comprises: a base plate having a hub protruding from a center thereof; a plurality of blades disposed on an outer circumerential surface of the base plate with a constant interval therebetween in a circumferential direction; and a shroud connected to the blades in opposition to the base plate. An outer diameter of a fan, a height of the blade, an inner diameter of the blade, an inner diameter of the shroud, an entrance angle of the blade, etc. are designed with an optimum condition, there by improving a blowing efficiency for cool air and reducing power consumption and noise.

1 . A turbofan for blowing, comprising:
 a base plate having a hub protruding from a center thereof;   a plurality of blades disposed on an outer circumerential surface of the base plate with a constant interval therebetween in a circumferential direction; and   a shroud connected to the blades in opposition to the base plate,   wherein a height of the blade is 16%˜26% of an outer diameter of a fan, in which the height of the blade denotes a gap between the base plate and the shroud, and the outer diameter of the fan denotes a diameter of a circle that is obtained by connecting outer ends of the respective blades.   
   
   
       2 . The turbofan for blowing of  claim 1 , wherein an entrance angle of the blade is 28°˜35°, in which the entrance angle of the blade denotes an angle formed between an extension line from an inner end of the blade and a tangential line of a circle that is obtained by connecting inner ends of the respective blades. 
   
   
       3 . The turbofan for blowing of  claim 1 , wherein an exit angle of the blade is 31°˜40°, in which the exit angle of the blade denotes an angle formed between an extension line from an outer end of the blade and a tangential line of a circle that is obtained by connecting outer ends of the respective blades. 
   
   
       4 . The turbofan for blowing of  claim 1 , wherein an outer diameter of the fan is in a range of 130 mm˜155 mm. 
   
   
       5 . The turbofan for blowing of  claim 1 , wherein the outer diameter of the fan is equal to that of the shroud, but is larger than that of the base plate. 
   
   
       6 . The turbofan for blowing of  claim 1 , wherein an inner diameter of the shroud is 72%˜85% of the outer diameter of the fan. 
   
   
       7 . The turbofan for blowing of  claim 1 , wherein an inner diameter of the blade is 55%˜62% of the outer diameter of the fan, in which the inner diameter of the blade denotes a diameter of a circle that is obtained by connecting inner ends of the respective blades. 
   
   
       8 . A turbofan for blowing, comprising:
 a base plate having a hub protruding from a center thereof;   a plurality of blades disposed on an outer circumerential surface of the base plate with a constant interval therebetween in a circumferential direction; and   a shroud connected to the blades in opposition to the base plate,   wherein an inner diameter of the shroud is 72%˜85% of an outer diameter of a fan, in which the outer diameter of the fan denotes a diameter of a circle that is obtained by connects outer ends of the respective blades.   
   
   
       9 . The turbofan for blowing of  claim 8 , wherein an entrance angle of the blade is 28°˜35°, in which the entrance angle of the blade denotes an angle formed between an extension line from an inner end of the blade and a tangential line of a circle that is obtained by connecting inner ends of the respective blades. 
   
   
       10 . The turbofan for blowing of  claim 8 , wherein an exit angle of the blade is 31°˜40°, in which the exit angle of the blade denotes an angle formed between an extension line from an outer end of the blade and a tangential line of a circle that is obtained by connecting outer ends of the respective blades 
   
   
       11 . The turbofan for blowing of  claim 8 , wherein an outer diameter of the fan is in a range of 130 mm˜155 mm. 
   
   
       12 . The turbofan for blowing of  claim 8 , wherein an inner diameter of the blade is 55%˜62% of the outer diameter of the fan, in which the inner diameter of the blade denotes a diameter of a circle that is obtained by connecting inner ends of the respective blades. 
   
   
       13 . A turbofan for blowing, comprising:
 a base plate having a hub protruding from a center thereof;   a plurality of blades disposed on an outer circumerential surface of the base plate with a constant interval therebetween in a circumferential direction; and   a shroud connected to the blades in opposition to the base plate;   wherein an inner diameter of the blade is 55%˜62% of an outer diameter of a fan, in which the outer diameter of the fan denotes a diameter of a circle that is obtained by connecting outer ends of the respective blades, and the inner diameter of the blade denotes a diameter of a circle that is obtained by connecting inner ends of the respective blades.   
   
   
       14 . The turbofan for blowing of  claim 13 , wherein an entrance angle of the blade is 28°˜35°, in which the entrance angle of the blade denotes an angle formed between an extension line from an inner end of the blade and a tangential line of a circle that is obtained by connecting inner ends of the respective blades. 
   
   
       15 . The turbofan for blowing of  claim 13 , wherein an exit angle of the blade is 31°˜40°, in which the exit angle denotes an angle formed between an extension line from an outer end of the blade and a tangential line of a circle that is obtained by connecting outer ends of the respective blades. 
   
   
       16 . The turbofan for blowing of  claim 13 , wherein an outer diameter of the fan is in a range of 130 mm˜155 mm. 
   
   
       17 . The turbofan for blowing of  claim 13 , wherein a height of the blade is 16%˜26% of the outer diameter of the fan, in which the height of the blade denotes a gap between the base plate and the shroud. 
   
   
       18 . A refrigerator having a turbofan for blowing, the turbofan comprising:
 a base plate having a hub protruding from a center thereof;   a plurality of blades disposed on an outer circumerential surface of the base plate with a constant interval therebetween in a circumferential direction; and   a shroud connected to the blades in opposite to the hub,   wherein a height of the blade is 16%˜26% of an outer diameter of a fan, in which the height of the blade denotes a gap between the base plate and the shroud, and the outer diameter of the fan denotes a diameter of a circle that is obtained by connecting outer ends of the respective blades.   
   
   
       19 . The refrigerator of  claim 18 , wherein an inner diameter of the shroud is 72%˜85% of the outer diameter of the fan. 
   
   
       20 . The refrigerator of  claim 18 , wherein an inner diameter of the blade is 55%˜62% of the outer diameter of the fan, in which the inner diameter of the blade denotes a diameter of a circle that is obtained by connecting inner ends of the respective blades.