| 摘要 |
<p>The propulsion device forms a pump and comprises an alternately displaced flexible diaphragm. An annular passage 10, formed between the smooth, parallel or slightly divergent internal faces 11, 12 of two walls 2, 3, extends radially all round a central orifice 8 and the flexible diaphragm 4 extends freely into the annular passage 10 and is connected to a vibrating element 6, capable of causing the periphery of the diaphragm 4 to oscillate in a manner essentially perpendicular to its local mid-plane, in such a way that it is subjected to trains of concentric oscillations directed towards its centre. Application in low-power booster pumps such as circulating pumps for central heating.</p> |
