| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric fan capable of switching an airflow into a diffusion airflow and a straight airflow while suppressing the increase in a pressure loss.SOLUTION: An electric fan comprises: a propeller fan 2 having a revolving shaft 5; a front guard 8 for covering the front side when the flow direction of air flow generated by the propeller fan 2 is forward, and having a double structure composed of an inside part and an outside part with the revolving shaft 5 as a center; a control blade 12 only on the outside part for controlling the straightness of the air flow directed forward; and a changeover part for changing the ON/OFF of functions of the control blade 12.SELECTED DRAWING: Figure 2 |
