| 摘要 |
Disclosed is an axial fan for blowing air, for an electric fan, heater, or the like. Compared to existing models, for the same diameter and rotational speed, the disclosed axial fan produces a greater area and volume of air flow in front of the axial fan. Also, the axial fan can be manufactured using a two-piece mold, making mass production easy, while maintaining the strength of the fan itself The axial fan is provided with: a rotating shaft part attached to the rotating shaft of a rotational drive means; a set of internal blades provided coaxially with and to the outside of the rotating shaft part; and a set of external blades provided coaxially with and to the outside of the set of internal blades. The set of internal blades comprises a plurality of internal blades provided radially around the rotating shaft part, and the set of external blades comprises a plurality of external blades provided radially around the rotating shaft part. The numbers, areas, angles, and shapes of the internal blades and external blades are designed such that the speed V 1 of the airflow formed by the set of internal blades and the speed V 2 of the airflow formed by the set of external blades satisfy the relation 1.5V 1 <V 2 |
