| 摘要 |
A liquid under pressure flows through a conduit to an inlet of a jet pump means from which issues a high velocity stream of liquid. An area of pressure lower than ambient pressure is established in the high velocity stream and this is communicated through a passageway to an inner face of a compressible resilient pad which is to be disposed against the submerged surface. A pressure differential exists between the ambient liquid on the outer side of the pad and the liquid flowing between the inner surface of the pad and the submerged surface and this pressure differential urges the compressible pad toward the submerged surface to conform to the contour thereof and results in a thin high velocity film of liquid flow across the submerged surface to clean the same. Rubbing contacts between the submerged surface and asperities on the surface of the pad serves to augment the cleaning action of the liquid flow. The resilient pad may also be somewhat porous thus allowing the flow of some liquid directly from the peripheral areas of the pad to the inlet of the jet pump thus tending to increase the surface flow velocity in these peripheral areas.
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