Liquid purification or separation – Processes – Separating
Patent
1995-12-12
1997-04-29
Reifsnyder, David A.
Liquid purification or separation
Processes
Separating
210784, 210402, 210403, 210386, 209270, 209284, 2392251, B01D 3311
Patent
active
056245785
DESCRIPTION:
BRIEF SUMMARY
This invention relates to improvements in and relating to a nozzle assembly for separation apparatus especially for use in separating of solids from liquids by screening.
The invention is intended for use in separation apparatus wherein a liquid suspension is introduced by feed means to the interior of a rotatable screening drum, and ejected onto or across the inner surface of the drum so that liquid passes through apertures in the drum while screened solids can be extracted from within the drum.
Up to the present time, various nozzle assemblies for use in separation apparatus have been available.
In such separation apparatus the nozzle assembly is generally set at a specific distance from the rotating inner wall of the screening drum in order that a substantially optimum pressure of flow of suspension onto or across the inner surface of the rotating drum may be achieved. The disadvantage of this system is that in order to maintain a substantially constant distance between the outlet of the nozzle and the inner surface of the rotating drum, and thus a substantially constant pressure of flow, the drum must be a substantially perfect cylinder. Such drum construction suffers from a disadvantage of being complex and expensive.
It is thus the object of the present invention to provide a nozzle assembly for a separation apparatus such that a substantially constant and substantially optimum distance may be maintained between the discharge end of the nozzle and the surface of the rotating drum when the drum is not a perfect cylinder and/or to at least provide the public with a useful choice.
According to the present invention there is provided in a first aspect a nozzle assembly for ejecting a liquid suspension onto or across the inner surface of the rotatable screening drum of a separation apparatus having feed means to introduce the liquid suspension to said nozzle assembly, and characterised in that at least the outlet end of said nozzle assembly is biasable towards said inner surface of said drum, and wherein tracking means are provided on said nozzle assembly such that said tracking means contacts said inner surface of said drum when said outlet end is so biased, such that said tracking means maintains a substantially constant distance between said outlet end and said inner surface of said drum while said outlet end is so biased.
According to the present invention there is provided in a second aspect a method of ejecting a liquid suspension onto or across the inner surface of the rotatable screening drum of a separation apparatus at a substantially constant pressure, comprising: towards or across said inner surface; inner surface; of said drum such that a substantially constant distance is maintained between said outlet end and said inner surface of said drum.
This invention may also be said broadly to consist in the parts, elements and features referred to or indicated in the specification of the application individually, or collectively, and any or all combinations of any two or more of said parts, elements or features, and where specific integers are mentioned herein which have known equivalents in the art to which this invention relates, such known equivalents are deemed to be incorporated herein as if individually set forth.
Further aspects of this invention, which should be considered in all its novel aspects, will become apparent from the following description given by way of example of a possible embodiment thereof, and in which reference is made to the accompanying drawings wherein:
FIG. 1: Shows diagrammatically an elevational view of a nozzle assembly for a pressure-fed separation apparatus according to one possible embodiment of the invention.
FIG. 2: Shows diagrammatically a plan view of the nozzle assembly of FIG. 1.
FIG. 3: Shows diagrammatically a perspective view of the nozzle assembly of FIG. 1.
FIG. 4: Shows diagrammatically a plan view of a connector means forming part of the nozzle apparatus of FIG. 1.
FIG. 5: shows an elevational view of the connector means of FIG. 4.
FIG. 6: Shows diagr
REFERENCES:
patent: 4426289 (1984-01-01), Svehaug
patent: 5078903 (1992-01-01), Burgess
patent: 5152891 (1992-10-01), Netkowicz et al.
Andritz Sprout-Bauer, Inc.
Reifsnyder David A.
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