Centrifugal Fan

Abstract

There is provided a centrifugal fan capable of minimizing variations of the vent flow amount of the gas in the direction of the height of the vent. The centrifugal fan 1 of the present invention includes a housing 10 including an intake port 11 a and an impeller 20 arranged inside the housing 10 , including a base part 21 and a plurality of vanes 25 , wherein the intake port 11 a takes in gas on one end portion side in the rotary axis direction 33 , a face of the base part 21 on a side of the intake port 11 a includes a gradient face 22 inclined toward a rotary shaft 33 and the intake port 11 a , the plurality of vanes 25 are provided at the gradient face 22 , and the width of the vanes 22 in the radial direction is increased from the intake port 11 a side toward the gradient face 22.

What is claimed is: 
     
         1 . A centrifugal fan, comprising:
 a housing including an intake port; and   an impeller arranged inside the housing, including a base part and a plurality of vanes, wherein   the intake port takes in gas on one end portion side in the rotary axis direction,   a face of the base part on a side of the intake port comprises a gradient face inclined toward a rotary shaft and the intake port,   the plurality of vanes are provided at the gradient face, and   the width of the vanes in the radial direction is increased from the intake port side toward the gradient face.   
     
     
         2 . The centrifugal fan according to  claim 1 , wherein
 the ratio H/W is equal to or larger than 0.55, wherein   H [mm] is a length of the impeller in the rotary axis direction and,   W [mm] is a length of the impeller in the radial direction.   
     
     
         3 . The centrifugal fan according to  claim 1 , wherein
 the length of the impeller in the radial direction is from 30 mm to 110 mm.   
     
     
         4 . The centrifugal fan according to  claim 1 , wherein
 D2 is equal to or smaller than D1×0.9, wherein   D1 [mm] is a distance of the inner shape of the inside of the plurality of vanes on the intake port side and,   D2 [mm] is a distance of the inner shape of the inside of the plurality of vanes on the base part side.   
     
     
         5 . The centrifugal fan according to  claim 4 , wherein
 the distance D2 [mm] is equal to or larger than the distance D1×0.4 [mm].   
     
     
         6 . The centrifugal fan according to  claim 1 , wherein
 the height of the top portion of the gradient face is smaller than a height of the center of the impeller.   
     
     
         7 . The centrifugal fan according to  claim 1 , wherein
 the vanes have an identical curvature radius in the rotary axis direction and   the inner end portion of the vane extends consecutively from the intake port side to the base part side in the radial direction.   
     
     
         8 . The centrifugal fan according to  claim 1 , wherein
 the impeller has a ring part coupling end portions of the plurality of vanes on the intake port side and   the outer peripheral part of the base part is inside the inner peripheral part of the ring part in the radial direction.   
     
     
         9 . The centrifugal fan according to  claim 1 , wherein
 the outer peripheral part of the plurality of vanes extends in the rotary axis direction.   
     
     
         10 . The centrifugal fan according to  claim 1 , comprising
 a motor including a rotary shaft coupled with the impeller, wherein   the base part comprises a first face on the intake port side and a second face on an opposite side to the first face, and   the second face is a gradient face.