| 摘要 |
<p>PURPOSE: To provide a screw-type aerator with high aeration efficiency and low fluid loss at a screw inlet part. CONSTITUTION: One or a plurality of plate-like vanes 4 are formed spirally at the tip part of a hollow axis 3 which is rotated by a driving motor and the length of the joining part 41 of the vanes 4 and the hollow axis 3 is made to be at least three times as long as the maximum height h of the vanes and the angleαformed between the joining part 41 and the hollow axis 3 in the circumferential direction or the angleβformed between the outer edge 42 of a vane 4 and the hollow axis 3 in the circumferential direction is made to become wider at least the screw outlet part 5b.</p> |
