| 摘要 |
<p>There is represented domestic ventilator in support 1 having an electromotor 2, on which shaft an impeller installed in protective cover executed with upper 7 and lower 8 hemispherical parts is forced. At that, impeller blades 13 are executed as impellers disposed symmetrically on whole length around axle, and hemiconical segments, which outer outlines repeating inner outline of protective cover.</p> |
