| 摘要 |
A fluid displacer comprises a generally tubular conduit (2) for a fluid (3) and at least one generally annular electromagnetic drive coil (4) surrounds the conduit. At least one fluid mover in a form of two aperture discs (7) is provided, the discs supporting a permanent magnet (5) between them. A resilient disc (1) is secured to the outer face of disc (7) at the downstream end of the fluid mover and can flex away from apertures (8) in the disc (7) to allow fluid to pass through the disc on the return stroke of the fluid mover, but seals those apertures in the drive direction of the fluid mover.
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