US2012034078A1PendingUtilityA1

Impeller and centrifugal compressor including the same

Assignee: KIM KIL YOUNGPriority: Aug 9, 2010Filed: Apr 6, 2011Published: Feb 9, 2012

Est. expiryAug 9, 2030(~4 yrs left)· nominal 20-yr term from priority

Inventors:Kil Young Kim

F04D 29/30F04D 29/284

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References

Claims

Abstract

Provided is an impeller of a centrifugal compressor including: a hub fixed to a rotation shaft; and a plurality of blades extending outward from a center portion of the hub on one surface of the hub, wherein a length of the blade is greater than a straight length between an inlet end of the blade and an outlet end thereof. Assuming that an outlet angle formed along a longitudinal direction of the blade at the outlet end of the blade is β and an inclination angle of the blade from the one surface of the hub at the outlet end of the blade is γ, the following equation is satisfied: 1<sin(β−20°)+cos(γ−40°)<1.5.

Claims

exact text as granted — not AI-modified

1 . An impeller of a centrifugal compressor comprising:
 a hub fixed to a rotation shaft; and   a plurality of blades extending outward from a center portion of the hub on one surface of the hub,   wherein a length of the blade is greater than a straight length between an inlet end of the blade and an outlet end thereof, and   assuming that an outlet angle formed along a longitudinal direction of the blade at the outlet end of the blade is β and an inclination angle of the blade from the one surface of the hub at the outlet end of the blade is γ, the following equation is satisfied:
   1&lt;sin(β−20°)+cos(γ−40°)&lt;1.5.
 
   
     
     
         2 . The impeller according to  claim 1 , wherein the outlet angle is in a range of 20° to 70°. 
     
     
         3 . The impeller according to  claim 1 , wherein the inclination angle is in a range of 40° to 90°. 
     
     
         4 . A centrifugal compressor comprising:
 an impeller which is fixed to a rotation shaft to be rotated at high speed; and   a diffuser which converts kinetic energy of a compressible medium that is increased by the impeller into pressure energy,   wherein the impeller comprises:   a hub fixed to the rotation shaft; and   a plurality of blades extending outward from a center portion of the hub on one surface of the hub,   a length of the blade is greater than a straight length between an inlet end of the blade and an outlet end thereof, and   assuming that an outlet angle formed along a longitudinal direction of the blade at the outlet end of the blade is β and an inclination angle of the blade from the one surface of the hub at the outlet end of the blade is γ, the following equation is satisfied:
   1&lt;sin(β−20°)+cos(γ−40°)&lt;1.5.
 
   
     
     
         5 . The centrifugal compressor according to  claim 4 , wherein the outlet angle is in a range of 20° to 70°. 
     
     
         6 . The centrifugal compressor according to  claim 4 , wherein the inclination angle is in a range of 40° to 90°.

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