| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress a decrease in fan efficiency and generation of noises in a multi-blade fan having inclined blades. <P>SOLUTION: Each forward blade 83 includes a first blade 85 having a rear edge 85r from which the distance to a rotating shaft S is almost constant in the axial direction of the rotating shaft S and a front edge 85f from which the distance to the rotating shaft S becomes smaller as it goes from one side to the other side of the axial direction of the rotating shaft S, and a second blade 87 which is disposed in front of the first blade 85 in a rotation direction D, has a front edge 87f located radially outside the front edge 85f of the first blade 85 and a rear edge 87r located radially outside the rear edge 85r of the first blade 85, and has a front edge 87f side part that is opposite in the rotation direction D to a rear edge 85r side part of the first blade 85 across a given gap. <P>COPYRIGHT: (C)2012,JPO&INPIT |
