Classifying – separating – and assorting solids – Sifting – With liquid treatment
Patent
1996-02-22
1997-05-20
Dayoan, D. Glenn
Classifying, separating, and assorting solids
Sifting
With liquid treatment
209290, B07B 122
Patent
active
056305133
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for fractionating suspensions including a tubular body having a centre and a circumferential strainer, and drive means arranged to turn the tubular body such that the strainer is turned at least intermittently about an axis extending through the centre of and substantially axially along the tubular body. Spray means is arranged to spray a suspension to be fractionated against the strainer such that a fine fraction of the suspension penetrates the strainer and a coarse fraction of the suspension is rejected by the strainer. Fine fraction discharge means is provided for discharging the fine fraction from the apparatus.
This type of spray fractionating apparatus is known to have a large flow capacity, compared with other conventional types of fractionating apparatus. However, a problem of the spray fractionating apparatus is that some of the coarse particles developed on the strainer can block the strainer holes and thereby prevent fine fraction from penetrating the strainer until said coarse particles have been removed from the strainer.
OBJECT OF THE INVENTION
The object of the present invention is to provide a simple spray fractionating apparatus having an improved coarse particles removal capability.
This object is fulfilled by means of a spray fractionating apparatus of the type defined above, which is characterized in that the tubular body is positioned such that said axis extends substantially horizontally; the strainer comprises at least two strainer sections spaced from each other and disposed axially in series along the tubular body; and the spray means comprises at least one row of spray nozzles extending axially along the tubular body and adapted to spray the suspension onto the strainer sections from above the tubular body.
During operation, the developed coarse fraction leaves the strainer by flowing circumferentially between the strainer sections without blocking the strainer holes to be sprayed upon with suspension.
According to a preferred embodiment of the invention, the tubular body forms an annular groove between the strainer sections. The groove has less transversal extension than the strainer sections and serves to receive coarse fraction.
To aid the coarse fraction to flow into said groove, each strainer section may slope as seen in a longitudinal section through the top of the tubular body. In case the strainer comprises more than two strainer sections, it is preferred that at least each of the intermediate strainer sections slopes from a top point of the strainer section in two opposite axial directions of the tubular body, as seen in said longitudinal section.
An advantageous use of the apparatus of the invention is the combination of it with a dewatering device such that the developed coarse fraction of the suspension is directly conveyed by gravity to the dewatering device.
The apparatus of the invention is particularly suited for fractionating fibre pulp suspensions.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained below in more detail by way of example with reference to the accompanying drawings, in which
FIG. 1 is a cross-sectional view of a preferred embodiment of an apparatus according to the invention,
FIG. 2 is a longitudinal view along line II--II of the FIG. 1,
FIG. 3 is a modification shown in part of the embodiment shown in FIG. 2,
FIGS. 4 and 5 show two further embodiments of the apparatus of the invention,
FIGS. 6-8 and 10 are modifications of the strainer of the the embodiment shown in FIG. 2,
FIG. 9 is a section along line IX--IX of FIG. 6,
FIG. 11 is a part of a section along line XI--XI of FIG. 10, and
FIG. 12 is a combination of an apparatus of the invention and a dewatering device.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The embodiment of the apparatus of the invention shown in FIGS. 1 and 2 comprises a tubular body 1 having a centre and three circumferential strainer sections 2 forming a tubular strainer. The tubular body 1 is rotatable about a horizontal axi
REFERENCES:
patent: 261653 (1882-07-01), Bayley
patent: 2274891 (1942-03-01), Dysthe
patent: 3113733 (1963-12-01), Carlson
patent: 3145164 (1964-08-01), Jonkman
patent: 3392828 (1968-07-01), Muller
patent: 4075104 (1978-02-01), Ringel
Beloit Technologies Inc.
Dayoan D. Glenn
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