| 摘要 |
PROBLEM TO BE SOLVED: To reduce aerodynamic noise, and reduce a material cost of a blade cross sectional area by constituting a radius of curvature of a blade front edge part so as to gradually enlarge as coming nearer to a hub from an outer peripheral edge side. SOLUTION: Impellers 3 for an air blower are formed in a blade thickness structure, each radius of curvature of those front edge 3a parts is formed smaller in each blade outer peripheral edge side, and is gradually enlarged as coming nearer to a hub 2 side. Accordingly, each used material quantity of the blades 3 can be suppressed to the minimum. As a result, a weight is lightened, and thereby, a motor is driven by small power, and electric power expense is reduced. Since each radius of curvature of blade front ends 3a is enlarged as coming nearer to the hub 2b, generation of separation is suppressed on the bladed 3 even if there is turbulent airflow by a motor base and a motor having a large radius of curvature. As a result, a performance is improved and noise is reduced as a whole of an air blower.
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