| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a blower capable of reducing offensive noise caused by resonance, as a conventional air blower provided with a circulation flow channel necessary for self-oscillation phenomenon by a fluid element at its supply opening, generates offensive noise by peak noise generated at a resonance frequency in generating resonance frequency in the circulation air channel due to the shape of the circulation air trunk.SOLUTION: A blower 1 includes an inflow opening 12 as a fluid element nozzle portion 11, a supply opening 13, an element main flow channel 14, and a circulation air trunk 15, and further includes a wall surface 22 for reducing an opening area of an opening portion 19 between the element main flow channel 14 and the circulation air trunk 15, at a bottom surface 16 side of the element main flow channel 14, thus resonance noise can be reduced so that the offensive noise can be reduced.</p> |
