| 摘要 |
PROBLEM TO BE SOLVED: To provide an axial blower and the like of low noise.SOLUTION: An axial blower includes an impeller 1 having a boss 2 rotating around a shaft center, and a plurality of blades 3 surrounded by an inner peripheral edge 31, an outer peripheral edge 32, a front edge 33 and a rear edge 34. When a radius of the boss 2 on the shaft center as a center is Rb, a radius of the outer peripheral edge 32 of the blade 3 is Rt, a radius Rm1 satisfies Rb<Rm1<Rt, and a radius Rm2 satisfies Rb<Rm2<Rt, a part where a distance R1 to the shaft center, of the front edge 33 satisfies Rb<R1<Rm1, and a part where a distance R2 to the shaft center, of the rear edge 34 satisfies Rm2<R2<Rt are respectively retracted in the anti-rotating direction toward an outer peripheral side, and composed of a curved line convex in the rotating direction, and a part where Rm1<R1<Rt is satisfied, of the front edge 33 and a part where Rm2<R2<Rt is satisfied, of the rear edge 34 are advanced in the rotating direction toward the outer peripheral side, and composed of a curved line convex in the anti-rotating direction. |
