| 摘要 |
<p>The unit has a rotary pump driven by an electrical drive motor (16), and a power unit housing (2) accommodating the pump. An inlet (8) is arranged in a buoyant condition under a fluid i.e. water, surface. The housing is formed and arranged such that the housing changes its alignment against a buoyant position during reaching the surface. Position-controlled switching units i.e. tilt switches, are provided within the housing. The housing has a tilting surface at a lower section in the buoyant condition. A protrusion (38) is formed at a lower side of the housing.</p> |
