| 摘要 |
A pump (10) comprising an inlet (12), an outlet (14) and a pumping chamber (16) between the inlet (10) and the outlet (12). The pumping chamber (16) has first and second opposed interior pumping chamber surfaces (18, 20) extending from the inlet (12) to the outlet (14) in a pumping direction (PD). The pump (10) also has a flexible diaphragm (22) between the first and second pumping chamber surfaces (18, 20) which is adapted to substantially sealingly separate the first and second pumping chamber surfaces (18, 20) from one another. The diaphragm (22) has first and second layers (24, 26) adjacent the first and second pumping chamber surfaces (18, 20) respectively. A means (38) is also provided which induces substantially sinusoidal motion in the diaphragm (22) in the pumping direction (PD) without inducing relative movement between the diaphragm (22) and the pumping chamber (16) in the pumping direction (PD). The amplitude of the sinusoidal motion is approximately equal to the distance between the first and second pumping chamber surfaces (18, 20) in a direction normal to the pumping direction (PD) minus the distance between the sides of the diaphragm first and second layers (24, 26) adjacent the pumping chamber surfaces (18, 20). The length of the pumping chamber (16) in the pumping direction (PD) is greater than or equal to one wavelength of the sinusoidally shaped diaphragm (22) and the motion inducing means (38) is, at least in the region of the diaphragm (22) adjacent the first and second pumping chamber surfaces (18, 20), disposed within the first and second layers (24, 26) of the diaphragm (22).
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