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 comprising
   a casing having a space that accommodates an impeller therein and including a portion that includes an air inlet opening therein, wherein the casing further includes an outlet for air discharge;        the impeller comprising a cup shaped central portion with a first end and an open second end opposite the first end, a plurality of blades peripherally surrounding the cup shaped central portion and being supported on a blades - mounting portion of the impeller; and        a driving motor,      wherein the impeller is rotated by the driving motor,        wherein the blades - mounting portion is located substantially adjacent, outwardly in a radial direction, the open second end of the cup shaped central portion; and        wherein the blades - mounting portion includes openings therein.       
     
     
       4. The blower according to  claim 3 , wherein the cup shaped central portion comprises a motor yoke. 
     
     
       5. The blower according to  claim 3 , wherein the cup shaped central portion comprises a body of the impeller. 
     
     
       6. The blower according to  claim 3 , wherein a portion of the casing, on a side opposite the portion including the air inlet therein, includes no air inlets therein such that the portion including the air inlet therein is the only air inlet for the blower. 
     
     
       7. The blower according to  claim 3 , wherein the openings in the blades- mounting portion are substantially annular.   
     
     
       8. The blower according to  claim 3 , 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 having a space that accommodates an impeller therein and including a first portion and a second portion, joined to the first portion, the second portion including an air inlet opening therein, wherein the casing further includes an outlet for air discharge;        the impeller comprising a cup shaped central portion with a first end and an open second end opposite the first end, a plurality of blades peripherally surrounding the cup shaped central portion and being supported on a blades - mounting portion of the impeller; and        a driving motor,      wherein the impeller is rotated by the driving motor,        wherein the first end of the impeller is located at a side of the casing adjacent the air inlet opening of the second portion;        wherein the blades - mounting portion is located at a side of the casing adjacent a bottom of the first portion, and opposite the second portion, and        wherein the blades - mounting portion includes openings therein.       
     
     
       10. The blower according to  claim 9 , wherein the cup shaped central portion comprises a motor yoke. 
     
     
       11. The blower according to  claim 9 , wherein the cup shaped central portion comprises a body of the impeller. 
     
     
       12. The 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. 
     
     
       13. The blower according to  claim 9 , wherein the openings in the blades- mounting portion are substantially annular.   
     
     
       14. The 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. 
     
     
       15. A blower comprising
   a casing having a space that accommodates an impeller therein and including a first portion and a second portion, joined to the first portion, the second portion including an air inlet opening therein, wherein the casing further includes an outlet for air discharge;        the impeller comprising a cup shaped central portion with a first end and an open second end, a plurality of blades peripherally surrounding the cup shaped central portion and being supported on a blades - mounting portion of the impeller, wherein the blades - mounting portion includes openings therein; and        a driving motor,      wherein the impeller 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 central portion together form a continuous annular air inlet passageway.       
     
     
       16. The blower according to  claim 15 , wherein the cup shaped central portion comprises a motor yoke. 
     
     
       17. The blower according to  claim 15 , wherein the cup shaped central portion comprises a body of the impeller. 
     
     
       18. The blower according to  claim 15 , 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 side and an opposite second side, the second side including an air inlet opening therein, wherein the casing further includes an outlet for air discharge;        an impeller housed within the casing and supported rotatably in the casing via a shaft, the impeller comprising a cup shaped central portion having a first end side and an open second end side, opposite the first end side, and a side wall portion extending in an axial direction from the first end side to the open second end side in an axial direction, and a plurality of blades peripherally surrounding the cup shaped central portion and being supported on a blades - mounting portion of the impeller that extends radially outward from the side wall portion at the open end side of the side wall portion; and        a driving motor,      wherein the impeller is rotated by the driving motor,        wherein the first end side of the central portion of the impeller is located substantially adjacent, in an axial direction, the second side of the casing;        wherein the blades - mounting portion is located substantially adjacent, in an axial direction, the first side of the casing; and        wherein the blades - mounting portion includes openings therein.       
     
     
       20. The 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. The blower according to  claim 19 , wherein the cup shaped central portion comprises a motor yoke. 
     
     
       22. The blower according to  claim 19 , wherein the cup shaped central portion comprises a body of the impeller. 
     
     
       23. The blower according to  claim 19 , wherein the first side of the casing includes no air inlet openings therein. 
     
     
       24. The blower according to  claim 19 , wherein the openings in the blades- mounting portion are substantially annular.