Air blower for fuel cell vehicle

Abstract

Disclosed herein is an air blower for a fuel cell vehicle using bearings. The air blower may include a volute casing, an impeller configured to include a hub and a plurality of wings formed on the outer circumferential surface of the hub and to compress air within the volute casing, a motor casing connected to the volute casing, and a motor configured to include a stator, a rotary shaft lengthily formed to penetrate the stator and configured to have a first side connected to the impeller, a rotator formed on the outer circumferential surface of the rotary shaft, a first bearing provided on the first side of the rotary shaft connected to the impeller, and a second bearing provided on a second side of the rotary shaft.

We claim: 
     
         1 . An air blower for a fuel cell vehicle, comprising:
 a volute casing;   an impeller configured to comprise a hub and a plurality of wings formed on an outer circumferential surface of the hub and to compress air within the volute casing;   a motor casing connected to the volute casing; and   a motor configured to comprise a stator, a rotary shaft lengthily formed to penetrate the stator and configured to have a first side connected to the impeller, a rotator formed on an outer circumferential surface of the rotary shaft, a first bearing provided on the first side of the rotary shaft connected to the impeller, and a second bearing provided on a second side of the rotary shaft,   wherein the air blower for a fuel cell vehicle has specific speed of 28 to 41.   
     
     
         2 . The air blower of  claim 1 , wherein the impeller has a rotation angle of 60 to 90°. 
     
     
         3 . The air blower of  claim 1 , wherein the impeller has an exit angle of 30 to 50°. 
     
     
         4 . The air blower of  claim 1 , wherein a ratio of an exit width with respect to an exit radius in the impeller is 0.04 to 0.09. 
     
     
         5 . The air blower of  claim 1 , wherein:
 the wings of the impeller comprise a plurality of first wings formed on the outer circumferential surface of the hub and a plurality of second wings configured to have a shorter length than the first wings in a length direction of the hub, and   a number of second wings is a prime fraction.   
     
     
         6 . The air blower of  claim 5 , wherein the impeller is made of aluminum. 
     
     
         7 . The air blower of  claim 1 , further comprising:
 an air inlet configured to suck air in an axial direction of the blower;   an air channel configured to have air, passing through the impeller of the volute casing, move therethrough; and   an air outlet configured to discharge air in a tangent direction of the volute casing.   
     
     
         8 . The air blower of  claim 7 , wherein:
 the air channel of the volute casing is hollowed in such a way to surround a central region of the volute casing in a circumferential direction of the volute casing, and   a hollowed cross section of the air channel is proportionately increased in an air flow direction.   
     
     
         9 . The air blower of  claim 8 , wherein a discharge region of the air channel and the air outlet in the volute casing have an identical cross section. 
     
     
         10 . The air blower of  claim 7 , wherein the air inlet is formed by hollowing a central region of the volute casing. 
     
     
         11 . The air blower of  claim 7 , further comprising an inflow casing mounted on a side opposite a side on which the volute casing of the motor casing is provided and configured to have the air inlet formed therein, and
 the air sucked through the air inlet of the inflow casing is discharged through the air channel and the air outlet via the motor casing.