| 摘要 |
<p>The device comprises a pump body (10) comprising a central cylindrical chamber housing a drive screw and a plurality of parallel lateral cylindrical chambers forming an intersection with the central chamber and accommodating guided lateral fluid conveyor screws (16) driven by a central screw by interleaving the threads. In order to make the device fully two-directional and reversible, an internal drain and fluid collection circuit is provided, said circuit comprising collector cavities (36,44) at each end of the body (10), said cavities communicating with the central chamber for local collection of internal fluid leakages coming from the central and lateral screws; by-pass conduits (38,36) being also provided, linking the first collector cavity (36) to the second transfer opening (32), and the second collector cavity (44) to the first transfer opening (34) via an associated non-return means (40,48).</p> |
