| 摘要 |
A waste extraction system ( 10 ) for an aquaculture tank ( 12 ) includes a first conduit ( 18 ) having a first end ( 20 ) and a distant second end, with a second conduit ( 22 ) disposed within the conduit ( 18 ). The second conduit ( 22 ) has a first end ( 24 ) which is co-terminus with the end ( 20 ) of the first conduit ( 18 ). A plate ( 26 ) extends transversely across the ends ( 20, 24 ) and laterally of the first conduit ( 18 ). An axial hole ( 28 ) is formed in the plate ( 26 ) to provide fluid communication with the second conduit ( 22 ), but the plate ( 26 ) otherwise closes off or seals the end ( 20 ) of the first conduit ( 18 ). Legs ( 30 ) are formed on an underside of the plate ( 26 ) to space the plate ( 26 ) from a bottom wall ( 16 ) of the tank ( 12 ). Apertures ( 34 ) are formed in the conduit ( 18 ) near its first end ( 20 ) to allow water to flow into a flow chamber ( 36 ) created between an inner surface of the conduit ( 18 ) and an outer surface of the conduit ( 22 ). The conduits ( 18, 20 ) exit the tank ( 12 ) at a location ( 38 ) which is at least partially below the water level ( 40 ) of the tank ( 12 ). A circular flow of water is generated in the tank ( 12 ) by having a water inlet manifold directing that allows incoming water to flow tangentially to an inside surface of a side wall ( 14 ) of the tank ( 12 ). By continually pumping water into the tank ( 12 ) while maintaining the water level ( 40 ), water is drawn from above the plate ( 26 ) through the apertures ( 34 ) in the first conduit ( 18 ) into the flow chamber ( 36 ) thereby creating a general upflow of water. Solid particulate material collects by action of centripetal force into a region beneath the plate ( 26 ) where it is entrained in water and flows up through the axial hole ( 28 ) in the plate ( 26 ) into the second conduit ( 22 ) and out of the tank ( 12 ). |
