Liquid purification or separation – With movable support – Float
Patent
1989-09-26
1991-09-24
Silverman, Stanley S.
Liquid purification or separation
With movable support
Float
2102424, 210923, 210924, E02B 1504
Patent
active
050511815
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a device for taking up substances floating in or on the surface of a fluid, which substances at a relative movement between the device and the fluid are brought to at least one uptaking machine, which is partially immersed in the fluid.
BACKGROUND OF THE INVENTION
A machine commonly used for taking up e.g. oil from water is constituted by a belt uptaking machine, comprising an endless, inclined belt, the lower end of which is immersed in the water, and where the oil shall adhere to the ascending belt part of the rotating belt. At the other, upper end of the belt uptaking machine there is provided a device for scraping off oil from the belt. These belt uptaking machines are commonly installed in specialized ships, where the belt may be arranged in the upstream or downstream direction.
Under certain operational conditions the rotation of these belts counteract their own function. Most belt uptaking machines are intended for taking up from the front, like an elevator, where oil, often by means of booms, is collected and supplied to the belt and the oil thereupon is conveyed further upwards along the belt. The inlet system of these belt uptaking machines has proven itself to have some serious drawbacks, based on the fact that it is easily affected by the waves, thus that the taking up capacity is considerably reduced, although the speed has been reduced to below one knot. The problem is that the belt uptaking machine generates a wash, partly because the belt at its movement upwards "tears" along water, and partly because a counterpressure wash is formed when the uptaking means moves up and down through the mass of water. The water film thereby created by the wash efficiently prevents oil from adhering to the belt.
PURPOSE AND MOST ESSENTIAL FEATURES OF THE INVENTION
The purpose of the present invention is to provide an uptaking device, which:
a) allows such inflow of oil to the inlet of the uptaking device, that the oil is not "teared" (urged) down below the water surface, b) is not affected by the waves, thus that the adherence of the oil to the belt is not disturbed to any appreciable degree,
c) prevents the creation of a wash when the uptaking device moves forward through the fluid, d) allows oil lumps, solid contaminants, etc. to enter the device and to be conveyed through the system,
e) shall be designed in such a manner, that oil afloat on the water within rather a big radius around the inlet opening, is pulled towards this,
f) can take care of oil of different viscosities (highly viscous as well as heavy oil),
g) is designed so that oil which has not been taken up or has escaped from the belt is moved back to the taking up position,
h) is easy to manufacture and operate,
i) is easily adjustable in height and laterally,
k) has a high uptaking capacity.
These tasks have been solved in that at least a portion of the immersed part of the uptaking machine in the fluid is surrounded by at least one screening off and deflecting member, which is arranged to create in the fluid around said immersed part a protected zone and controlled flow of the oil to the belt.
DESCRIPTION OF THE DRAWINGS
The invention herebelow will be further described with reference to the accompanying drawings, which show some embodiments.
FIG. 1 is a schematic side view of the lower part of a device according to the invention, in its most simple form.
FIG. 2 shows a modified variant of the device according to the invention in a view from above.
FIG. 3 shows a section along line III--III in FIG. 2.
FIG. 4 shows further an embodiment of the invention provided with double uptaking machines in a view from above.
FIG. 5 shows the device according to FIG. 4 in a front view in bigger scale and partly in section.
FIGS. 6 and 7 show the device according to FIGS. 4 and 5 mounted at the stem of a ship in a view from above and in a front view.
DESCRIPTION OF EMBODIMENTS
The description hereinafter will be strictly directed to taking up oil from a water surface, but the device according to the invention can
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patent: 3536199 (1970-10-01), Cornelius
patent: 3812968 (1974-05-01), Aramaki et al.
patent: 3947360 (1976-03-01), Fast
patent: 4105554 (1978-08-01), Janson
patent: 4165282 (1979-08-01), Bennett et al.
patent: 4322294 (1982-03-01), Price
AB Sandvik Process Systems
Silverman Stanley S.
Upton Christopher
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