Centrifugal impeller

Abstract

The present relates to a centrifugal impeller. According to the invention, the centrifugal impeller includes: a base plate 11 that has a rotating shaft bracket at the center portion where a rotary shaft is fitted, and of which the surface radially formed from the rotary shaft socket is sloped downward in a straight line or at a predetermined radius of curvature to maintain an obtuse angle with respect to the rotary shaft; a plurality of blades 13 that is circumferentially arranged on the upper surface of the base plate 11 ; and a scroll casing 15 that is disposed on the fronts of the blades 13, has a suction hole 15 ′ at the center portion to suck fluid, and forms an enlarged channel 17 through which the fluid flows, between the base plate 11 and the scroll casing 15 by being sloped downward from the suction hole 15 ′ toward the radial end. According to the present invention, the base plate 11 of the centrifugal impeller 10 is sloped within a range of 0° to 17° of the slope angle, such that high-speed jet fluid pushed in the centrifugal direction by rotation of the rotary shaft can smoothly flow through the enlarged channel 17 between the base plate 11 and the scroll casing 15.

1 . A centrifugal impeller, comprising:
 a base plate that has a rotary shaft socket at the center portion where a rotary shaft is fitted, and of which the surface radially from the rotary shaft socket is sloped downward in a straight line or at a predetermined radius of curvature to maintain an obtuse angle with respect to the rotary shaft;   a plurality of blades that is circumferentially arranged on the upper surface of the base plate; and   a scroll casing that is disposed on the fronts of the blades, has a suction hole at the center portion to suck fluid, and forms an enlarged channel through which the fluid flows, between the base plate and the scroll casing by being sloped downward from the suction hole toward the radial end.   
     
     
         2 . The centrifugal impeller according to  claim 1 , wherein the slope angle of the base plate is calculated by the following equations for calculating a coefficient of loss, 
       
         
           
             
               
                 H 
                 loss 
               
               = 
               
                 
                   K 
                   ( 
                   
                     
                       v 
                       2 
                     
                     
                       2 
                        
                       
                           
                       
                        
                       g 
                     
                   
                   ) 
                 
                  
                 
                     
                 
                  
                 and 
               
             
           
         
         
           
             
               K 
               = 
               
                 { 
                 
                   
                     
                       
                         
                           0.5 
                           - 
                           
                             0.8 
                              
                             
                                 
                             
                              
                             θ 
                              
                             
                                 
                             
                              
                             for 
                              
                             
                                 
                             
                              
                             0.0 
                           
                         
                         ≦ 
                         θ 
                         ≦ 
                         2.0 
                       
                     
                   
                   
                     
                       
                         
                           0.14 
                           + 
                           
                             0.04 
                              
                             θ 
                              
                             
                                 
                             
                              
                             for 
                              
                             
                                 
                             
                              
                             2.0 
                           
                         
                         ≦ 
                         θ 
                         ≦ 
                         15.0 
                       
                     
                   
                 
                 } 
               
             
           
         
         [K: a coefficient of loss of flowing fluid, v: average flow rate of fluid passing through between the blades, g: acceleration of gravity, and H loss : loss head due to enlargement of the cross section of the enlarged channel]. 
       
     
     
         3 . The centrifugal impeller according to  claim 2 , wherein the slope angle of the base plate is in a range of 0° to 17°.