| 摘要 |
The invention relates to a pump (10). The pump includes a stator (12) and a rotor assembly (30), defining between them an annular fluid space (14) extending circumferentially about a central axis (16), about which axis the rotor assembly is rotatable. The stator has a fluid inlet (20) and a fluid outlet (22), respectively leading into and out of the fluid space and dividing the fluid space into a fluid flow path (24) and an obstruction zone (26). An obstruction (28) providing a gap (29) is located in the obstruction zone. A plurality of vanes (36) and a plurality of plugs (35) are mounted, in alternating fashion, on the rotor assembly, each vane and each plug being located in the fluid flow space. Each vane is pivotable, by means of a pivot arrangement, between an operative displacement condition in which it displaces fluid along the flow path, and an inoperative condition in which it passes through the gap. Each plug is fixedly mounted in an attitude which permits passing thereof through the gap, substantially to close the gap during passage of successive vanes through the gap, so that fluid displaced along the flow path leaves the fluid space via the outlet. |
