Cross flow fan and blowing device

Abstract

To provide a cross flow fan that can achieve an increase in air volume without causing an increase in size. Therefore, a cross flow fan includes a plurality of support rings arranged at a predetermined interval in a direction of a rotation axis, and a plurality of blades provided between adjacent support rings, located close to an outer circumference of the support ring, and spaced apart in the circumferential direction. The support ring has cutouts cut from the outer circumference end toward the inner circumference side, at each position between the adjacent blades. An outer diameter of the support ring at the cutout is smaller than a distance from the rotation axis to an outer end of the blade.

1 . A cross flow fan comprising:
 a plurality of support rings arranged at a predetermined interval in a direction of a rotation axis; and   a plurality of blades provided between adjacent support rings, located close to an outer circumference of a support ring of the adjacent support rings, and spaced apart in a circumferential direction,   a support ring of the plurality of support rings having cutouts cut from an outer circumference end toward an inner circumference side, a cutout of the cutouts being arranged at each position between adjacent blades,   an outer diameter of the support ring at the cutout being smaller than a distance from the rotation axis to an outer end of a blade of the plurality of blades.   
     
     
         2 . The cross flow fan according to  claim 1 , wherein a portion of the cutout extends along a shape of a negative pressure surface of the blade. 
     
     
         3 . The cross flow fan according to  claim 2 , wherein an end surface of the support ring at the portion of the cutout that extends along the shape of the negative pressure surface of the blade integrally forms a blade surface with the negative pressure surface of the blade. 
     
     
         4 . The cross flow fan according to  claim 1 , wherein a width of the cutout in a rotation direction from a portion of the support ring having a smallest outer diameter is smaller than a width of the cutout in a counter-rotation direction from the portion. 
     
     
         5 . The cross flow fan according to  claim 1 , wherein the cutout is disposed in a side of a rotation direction than an intermediate position of the adjacent blades. 
     
     
         6 . The cross flow fan according to  claim 1 , wherein the number of cutouts formed on the support ring is equal to the number of blades connected to the support ring. 
     
     
         7 . The cross flow fan according to  claim 1 , wherein an inner diameter of the support ring is equal to or more than half of a distance from the rotation axis to an inner end of the blade, and equal to or less than the distance from the rotation axis to the inner end of the blade. 
     
     
         8 . The cross flow fan according to  claim 1 , wherein positions of the blades connected to a first surface of the support ring and positions of the blades connected to a second surface are located in such a way as to prevent overlapping, the second surface being a back side of the first surface. 
     
     
         9 . The cross flow fan according to  claim 1 , wherein a surface of the support ring to which the blades are connected has a plurality of protruding portions and a plurality of recessed portions alternately arranged in the circumferential direction, and
 the blades are connected to the plurality of recessed portions of the support ring.   
     
     
         10 . A cross flow fan comprising:
 a plurality of support rings arranged at a predetermined interval in a direction of a rotation axis; and   a plurality of blades provided between the adjacent support rings, located close to an outer circumference of the support ring, and spaced apart in a circumferential direction,   a surface of the support ring to which the blades are connected having a plurality of protruding portions and a plurality of recessed portions alternately arranged in a circumferential direction,   the blades being connected to the plurality of recessed portions of the support ring.   
     
     
         11 . A blowing device comprising the cross flow fan according to  claim 1 . 
     
     
         12 . (canceled)