| 摘要 |
This pump comprises a chamber and an annular pumping diaphragm secured to the said chamber and the inner edge of which is secured to a central drive part. This diaphragm has a convex domed profile so that its expulsion stroke results essentially in the energy-generating flexing of the intake stroke. The rigidity of the diaphragm is chosen so that the absolute pressure of the chamber lies within the following range: Patm−(|&Dgr;Pvalve—in|+|&Dgr;P&Dgr;h—in|+|&Dgr;Ppd|)≧P>Pvap where: Patm=atmospheric pressure, Pvap=vapour pressure of the pumped fluid, &Dgr;Pvalve—in=pressure difference between the upstream and downstream side of the inlet valve for opening it, &Dgr;P&Dgr;h—in=pressure difference in the upstream pipe between its distal end and the upstream side of the inlet valve as a result of the weight of the column of fluid, &Dgr;Ppd=pressure drop in the upstream pipe for the desired flow rate. |
