Sirocco fan, blowing device, and air conditioner

Abstract

A boss of an impeller and a rotation shaft are fastened together without partially notching or removing a blade of the impeller. A sirocco fan includes an impeller including a boss formed to protrude outward from and end face sucking air when the impeller rotates. The boss is provided with a screw hole opening, on a side face of a protruding portion of the boss, for fastening the rotation shaft with a screw.

1 . A sirocco fan comprising
 an impeller including a boss for securing a rotation shaft transmitting rotational force of a motor, the impeller being configured to rotate to suck air from a direction in parallel with the rotation shaft, and to eject the air from a rotation face of the impeller, wherein   the boss is formed to protrude outward from an end face of the impeller sucking the air, and is provided with a screw hole opening, on a side face of a protruding portion of the boss, for fastening the rotation shaft with a screw.   
     
     
         2 . The sirocco fan according to  claim 1 , wherein
 the impeller includes two impellers each having a face across from the end face sucking the air, and connected together through the face, and   the screw hole opening on the boss of one of the two impellers and the screw hole opening on the boss of an other one of the two impellers are provided not in a single plane.   
     
     
         3 . The sirocco fan according to  claim 2 , wherein
 the screw hole opening on the boss of one of the two impellers and the screw hole opening on the boss of the other one of the two impellers shift 180° from each other in a rotation direction of the rotation shaft.   
     
     
         4 . The sirocco fan according to  claim 2 , wherein
 at least one of the two impellers includes a marking identifying a direction in which the rotation shaft is mounted.   
     
     
         5 . The sirocco fan according to  claim 1 , wherein
 the boss is made of aluminum.   
     
     
         6 . A blowing device comprising
 the sirocco fan according to  claim 2 , the sirocco fan including a plurality of sirocco fans rotatably connected together in series.   
     
     
         7 . An air conditioner comprising
 the sirocco fan, according to  claim 1 , serving as a blowing device.