| 摘要 |
Apparatus for collecting the surface layer of a body of liquid, e.g. a layer of oil on water comprises a first member defining a central passage which is upwardly open and is arranged in use with the opening at the level of the interface between the surface layer of liquid and the underlying layer, and a second member which defines with the first member an annular passage surrounding the central passage and provided with vanes which form the rotor of an axial pump when the two members are rotated about the axis of the central passage. This rotation causes the layer of liquid underlying the surface layer to be drawn towards the apparatus and downwardly through the annular passage to draw the surface layer of liquid into the central passage. Liquid in the central passage is pumped therefrom to a reservoir.
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