Patent ID: 7707925
Filing Date: 2010-05-04
Classification: F04B,Y10T

Abstract:
1. A pump for conveying a pumped fluid using an actuating fluid, the pump comprising: a rigid outer casing defining an interior space; and a tube structure accommodated in the interior space, the tube structure being flexible and substantially inelastic, an interior of the tube structure defining a pumping chamber for receiving pumped fluid, the tube structure being movable between laterally expanded and collapsed conditions for varying the volume of the pumping chamber thereby to provide discharge and intake strokes, the tube structure being maintained in a taut condition between the ends thereof, a region of the interior space surrounding the tube structure defining an actuating region for receiving and accommodating actuating fluid, the pumping chamber being configured to receive pumped fluid to cause the tube structure to move towards the expanded condition and the pumping chamber thereby undergoing an intake stroke, the pumping chamber undergoing a discharge stroke upon collapsing of the tube structure in response to an action of actuating fluid in the actuating region, wherein one end of the tube structure is closed and the other end is connected to a port through which pumped fluid enters into and discharges from the pumping chamber as the pumping chamber performs intake and discharge strokes and the tube structure is movably supported to accommodate longitudinal extension and contraction of the tube structure, and an axial length of the tube structure shortens during the intake stroke and increases during the exhaust stroke.