| 摘要 |
A pump (32) comprising a flexible member (65) defining at least part of a variable volume pumping chamber, an inlet valve (34) to permit of liquid to enter the chamber thereby and an outlet valve (39) to permit of liquid to leave the chamber thereby, operating means (64) to deform the flexible member (65) from an initial condition and resilient biasing means to return the flexible member (65) towards the initial condition to vary the volume of the pumping chamber to pump liquid into and out of the chamber wherein the resilient biasing means comprises a fluid containing unit in which relative movement of solid elements of the unit occurring on movement of the flexible member (65) from the initial condition is directly resisted by elastic deformation of the fluid and the resilient energy stored in the fluid causes return movement of the solid elements to move the flexible member (65) towards the initial condition. |
