| 摘要 |
<p>Centrifugal pumps (10) are disclosed having nonrotatable membranes (21) to rotate fluid in a pumping chamber having at least a first open passage inlet (71) and an open passage outlet (91). Specifically, the membrane (21) is deflected into a nonconcentric shape to the fluid rotation, with the nonconcentric shape being rotated to function as a centrifugal pump impeller by deformers (41, 42, 43) separated from the pumped fluid by the membrane (21). As the membrane (21) does not rotate, rotary shaft seals, bearings, or small gaps between moving, sliding, and/or rubbing pump surfaces and to which the pumped fluid is accessible are not required in the pumps (10). In preferred forms, the deformers (41, 42) can be located inside the membrane (21) and inside the pumping chamber or the deformer (43) can be located outside the membrane (21) and outside the pumping chamber. The membranes (21) are corrugated (102, 103) in the preferred form to direct the fluid flow into a rotary motion and to provide directional stiffness/flexibility characteristics. Secondary membranes (31) can be provided to cover the membrane (21) to prevent leaking and/or for ease of cleaning or sterilization. When the membrane (21) extends inside of the pumping chamber, a tube liner (51) can be provided inside of the membrane (21) and the deformer (41) to act as the primary inlet (81) or as a secondary inlet (81) with the housing inlet (71).</p> |
