Liquid purification or separation – Filter – Movable medium
Patent
1996-07-02
1999-03-09
Lithgow, Thomas M.
Liquid purification or separation
Filter
Movable medium
210405, 210456, 210783, 100118, 241 79, 241 2411, C02F 1112, B01D 3304, B01D 33056
Patent
active
058795510
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for dewatering suspensions, such as sludge or similar materials which can be dewatered, having a plurality of rollers and two filter bands which are guided around the rollers in an S-shape and enclose the material to be dewatered between them.
It relates in particular to presses with a multitude of pressure rollers, wherein successive drying of the suspension by means of the S-shaped wrapping of the rollers by the filter bands is achieved with an increase in rollers.
Such presses are employed in multitudinous designs, they are all essentially differentiated by the relative association of the successive rollers, their diameter and type of construction and the way of guiding the bands around the rollers, in particular the size of the wrap angle of the filter bands around the individual rollers.
The suspension to be dewatered varies, depending on the area of use, and it is possible to dewater various sludges, such as communal sludge, which in turn show a more or less high degree of previous water removal. The pressing of fruits or parts of fruits is also performed with such filter presses.
In the course of this it has been shown that a certain type of press, i.e. a press with a defined roller configuration and filter band guidance, will as a rule achieve an optimal operational result, i.e. generally a maximum degree of drying with specific suspensions or with specific suspension compositions. Thus, the multitude of structural variants of such presses which are available in the marketplace as a rule also are used to achieve optimum pressing results for specific or specifically set suspensions, whose degree of pre-drying, macro-molecular structure, possibly with the addition of additives, lies within a defined range.
However, the planning and construction of specific press configurations is increasingly elaborate, and such presses are relatively expensive because of the "specialist properties" described.
BRIEF SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a press of the simplest construction which covers a wide use spectrum by means of simple, quick and thus cost-effective modifications in construction, i.e. that a universally employable press is created by means of a simple basic design of the device in accordance with the invention, which over a wide range provides optimal suspension dewatering with a particularly good cost/benefit ratio.
This object is attained in accordance with the invention in that a device as described at the outset includes a plurality of rollers and two filter bands for enclosing the suspension, the two filter bands being guided along an S-shaped path around the rollers so that each roller is contacted by one of the bands over a respective contact area, the improvement wherein: the plurality of rollers comprise at least one pair of rollers composed of first and second roller; and the device further comprises at least one displacement mechanism coupled to one of the rollers of the at least one pair, the displacement mechanism being movable to displace the one of the rollers of the at least one pair relative to the other one of the rollers of the at least one pair over a path to create a pressing gap of adjustable width between the first and second rollers and a pressing force of adjustable magnitude on the suspension, whereby movement of the displacement mechanism creates an adjustable relation between the dewatering produced in the pressing gap and the dewatering produced in the contact area.
The basic concept of the invention therefore essentially consists in that a basic component of the press consists of a pair of rollers which can be adjusted in relation to each other and which comprise a pressing gap between them. The wrap angle of both rollers of the roller pair is preferably selected to cover 180.degree..
Such a roller pair allows the simultaneous use of both linear pressing and area pressing for dewatering the suspension, wherein, by means of the adjustable association with each o
REFERENCES:
patent: 432153 (1890-07-01), Whiting
patent: 2265455 (1941-12-01), Serpas
patent: 3613564 (1971-10-01), Adamski
patent: 3951809 (1976-04-01), Kollmar
patent: 4147101 (1979-04-01), Heissenberger
patent: 4491521 (1985-01-01), Wenske
patent: 4557833 (1985-12-01), Krenmayr
patent: 4885088 (1989-12-01), Sbaschnigg
patent: 5207907 (1993-05-01), Delons
patent: 5308486 (1994-05-01), Heintze
patent: 5309829 (1994-05-01), Gahlmann
Patent Abstracts From Japan, unexamined applications, Section C, vol. 6, No. 174, published on 1982, 08 Sep., The Patent Office Japanese Governement; p. 37C123; & JP, A,57087 895 (Hitachi).
Kolmar Ulrich
Matern Harald
Wenzel Lothar
Gebr, Bellmer GmbH & Co., KG
Lithgow Thomas M.
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