Blower

Abstract

A blower with the improved P-Q characteristics is provided. A blower comprising a shaft rotatably supported in a tubular casing, a cup shaped motor yoke 11 fixed to the shaft, and a body portion 15 of an impeller 14 comprising a large number of blades 13 on an outer peripheral portion is fixed to the motor yoke 11 , wherein the blower is characterized in that substantially ring-like openings 15 b are provided at a portion where the blades 13 of the body portion 15 are mounted and on a circumference around the shaft. Since air flow is facilitated by the openings 15 b, the P-Q (pressure—flow rate) characteristics are improved.

1. A blower comprising
 a shaft which is supported rotatably in a tubular casing,  
 a cup shaped motor yoke fixed to said shaft, wherein the shaft extends from a closed end of the cup shaped motor yoke to an open end of the cup shaped motor yoke, and  
 a body portion of an impeller comprising a plurality of blades on an outer peripheral portion fixed to said motor yoke, wherein substantially ring-like  openings are provided in the body portion at a mounting portion where said plurality of blades are mounted and on a circumference of a circle around said shaft, and wherein the mounting portion is located substantially adjacent, in a radially outward direction, the open end of the cup shaped motor yoke.  
 
     
     
       2. A blower according to  claim 1 , wherein said openings substantially form a long opening in an arc extending along the direction of the arrangement of said plurality of blades. 
     
     
       3. A blower according to  claim 1 , wherein the openings in the mounting portion are substantially annular.  
     
     
       4. A blower comprising
   a casing comprising a first portion having a circular space that accommodates a body portion of the blower therein and a second portion that joins to the first portion and includes an air inlet opening therein, wherein the casing further includes an outlet for air discharge;        the body portion comprising an impeller and having a cup shaped hub with a closed end and an open end, a plurality of blades peripherally surrounding the cup shaped hub being supported on a blades - mounting portion of the body portion; and        a driving motor,      wherein the body portion is rotated by the driving motor,        wherein the blades - mounting portion lies substantially adjacent, outwardly in a radial direction, the open end of the cup shaped hub, and        wherein the blades - mounting portion includes openings therein.        
     
     
       5. A blower according to  claim 4 , further including a motor yoke fixed inside the cup shaped hub of the body portion.  
     
     
       6. A blower according to  claim 4 , wherein the first portion of the casing includes no air inlets therein such that the air inlet in the second portion of the casing is the only air inlet for the blower.  
     
     
       7. A blower according to  claim 4 , wherein the openings in the blades- mounting portion are substantially annular.    
     
     
       8. A blower according to  claim 4 , wherein the outlet for air discharge in the casing comprises an opening in a side of the casing radial to the plurality of blades.  
     
     
       9. A blower comprising
   a casing comprising a first portion having a circular space that accommodates a body portion of the blower therein and a second portion that joins to the first portion and includes an air inlet opening therein, wherein the casing further includes an outlet for air discharge;        the body portion comprising an impeller and having a cup shaped hub with a closed end and an open end, a plurality of blades peripherally surrounding the cup shaped hub being supported on a blades - mounting portion of the body portion; and        a driving motor,      wherein the body portion is rotated by the driving motor,        wherein the blades - mounting portion is located at a side of the casing adjacent a bottom of the circular space of the first portion, and opposite the second portion, and          wherein the blades - mounting portion includes openings therein.      
     
     
       10. A blower according to  claim 9 , further including a motor yoke fixed inside the cup shaped hub of the body portion.  
     
     
       11. A blower according to  claim 9 , wherein the first portion of the casing includes no air inlets therein such that the air inlet in the second portion of the casing is the only air inlet for the blower.  
     
     
       12. A blower according to  claim 9 , wherein the openings in the blades- mounting portion are substantially annular.    
     
     
       13. A blower according to  claim 9 , wherein the outlet for air discharge in the casing comprises an opening in a side of the casing radial to the plurality of blades.  
     
     
       14. A blower comprising
   a casing comprising a first portion having a circular space that accommodates a body portion of the blower therein and a second portion that joins to the first portion and includes an air inlet opening therein, wherein the casing further includes an outlet for air discharge;        the body portion comprising an impeller and having a cup shaped hub with a closed end and an open end, a plurality of blades peripherally surrounding the cup shaped hub being supported on a blades - mounting portion of the body portion; and        a driving motor,      wherein the body portion is rotated by the driving motor,        wherein the first portion of the casing further includes a base having a protruding cylindrical portion that accommodates a bearing tube,        wherein the blades - mounting portion is substantially adjacent, outwardly in a radial direction, the protruding cylindrical portion, and        wherein the blades - mounting portion includes openings therein.        
     
     
       15. A blower according to  claim 14 , further including a motor yoke fixed inside the cup shaped hub of the body portion.  
     
     
       16. A blower according to  claim 14 , wherein the first portion of the casing includes no air inlets therein such that the air inlet in the second portion of the casing is the only air inlet for the blower.  
     
     
       17. A blower according to  claim 14 , wherein the openings in the blades- mounting portion are substantially annular.    
     
     
       18. A blower according to  claim 14 , wherein the outlet for air discharge in the casing comprises an opening in a side of the casing radial to the plurality of blades.  
     
     
       19. A blower comprising
   a casing comprising a first portion having a circular space that accommodates a body portion of the blower therein and a second portion that joins to the first portion and includes an air inlet opening therein, wherein the casing further includes an outlet for air discharge;        the body portion comprising an impeller and having a cup shaped hub with a closed end and an open end, a plurality of blades peripherally surrounding the cup shaped hub being supported on a blades - mounting portion of the body portion; and        a driving motor,      wherein the body portion is rotated by the driving motor,        wherein the blades - mounting portion includes openings therein, and        wherein the first portion of the casing includes no air inlets therein such that the air inlet in the second portion of the casing is the only air inlet for the blower.        
     
     
       20. A blower according to  claim 19 , wherein the outlet for air discharge in the casing comprises an opening in a side of the casing radial to the plurality of blades.  
     
     
       21. A blower comprising
   a casing comprising a first portion having a circular space that accommodates a body portion of the blower therein and a second portion that joins to the first portion and includes an air inlet opening therein, wherein the casing further includes an outlet for air discharge;        the body portion comprising an impeller and having a cup shaped hub with a closed end and an open end, a plurality of blades peripherally surrounding the cup shaped hub being supported on a blades - mounting portion of the body portion, wherein the blades - mounting portion includes openings therein; and        a driving motor,      wherein the body portion is rotated by the driving motor, and        wherein the air inlet opening in the second portion of the casing and the closed end of the cup shaped hub together form a continuous annular air inlet passageway.        
     
     
       22. A blower according to  claim 21 , wherein the outlet for air discharge in the casing comprises an opening in a side of the casing radial to the plurality of blades.