| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an aerator with which the width of aeration efficiency may be broadly set without changing a rotating speed so much and without exchanging the aerator. SOLUTION: Plural vanes 7 rotationally driven by a revolving shaft 1 are respectively composed of stationary vanes 5 and variable vanes 6. The variable vanes 6 are made turnable around revolving shafts 9. Even if the rotating speed of the revolving shaft 1 is set constant, the inclination of the variable vanes 6 is changed by driving variable drive motors 16 and turning and displacing the revolving shafts 9 via drive bars 13, by which the aeration efficiency may be changed.</p> |
