| 摘要 |
A pumping system comprising a pump ( 21 ) for conveying a pumped fluid using an actuating fluid. The pump comprising a rigid outer casing ( 25 ) defining an interior space ( 26 ), a tube structure ( 27 ) accommodated in the interior space ( 26 ), the tube structure ( 27 ) being flexible and substantially inelastic. The interior of the tube structure ( 27 ) defines a pumping chamber ( 28 ) for receiving pumped fluid. The tube structure ( 27 ) is movable between laterally expanded and collapsed conditions for varying the volume of the pumping chamber ( 28 ) thereby to provide discharge and intake strokes. The region of the interior space ( 26 ) surrounding the tube structure ( 27 ) defines an actuating region for receiving and accommodating actuating fluid. The pumping chamber ( 28 ) is adapted to receive pumped fluid to cause the tube structure ( 27 ) to move towards the expanded condition and the pumping chamber ( 28 ) thereby undergoing an intake stroke. The pumping chamber ( 28 ) undergoes a discharge stroke upon collapsing of the tube structure ( 27 ) in response to the action of actuating fluid in the actuating region. The pumping system also comprises a delivery means ( 50 ) for delivering pumped fluid to the pumping chamber ( 28 ) in timed sequence for causing the pumping chamber ( 28 ) to undergo an intake stroke, and means ( 70 ) for supplying actuating fluid to the actuating region in timed sequence to cause the tube structure ( 27 ) to laterally collapse whereby the pumping chamber ( 28 ) undergoes a discharge stroke.
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