Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1993-05-05
1994-08-16
Dayoan, D. Glenn
Classifying, separating, and assorting solids
Fluid suspension
Liquid
2105122, 209734, B04C 528
Patent
active
053378997
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a hydrocyclone plant, comprising a multiplicity of hydrocyclones arranged in groups of at least two hydrocyclones, each hydrocyclone having an elongated separation chamber with two opposite ends, at least one inlet for a liquid mixture to be separated, a light fraction outlet at one end of the separation chamber for a created light fraction and a heavy fraction outlet at the other end of the separation chamber for a created heavy fraction. There are walls defining a cylindrical heavy fraction space, which communicates with the heavy fraction outlets, an annular inlet space, which extends concentrically around the heavy fraction space and communicates with the inlets of the hydrocyclones, and an annular light fraction space, which extends concentrically around the inlet space and communicates with the light fraction outlets. Each hydrocyclone extends substantially radially in said annular inlet space, and each group of hydrocyclones is made in one single piece.
BACKGROUND OF THE INVENTION
A hydrocyclone plant of the general kind described is known from U.S. Pat. No. 4,190,523, in which each hydrocyclone group forms a disc having a number of radially oriented hydrocyclones, said disc-shaped hydrocyclone groups being stacked. This known plant is not practical to use for applications which require relatively long hydrocyclones, since the discs would be too large and heavy. For instance, when cleaning fiber pulp suspensions by means of this plant, the required long hydrocyclones would result in discs having a diameter exceeding two metres. Such large discs would be difficult to disassemble from the stack of discs for servicing and repairing individual hydrocyclones. The object of the present invention is to provide a hydrocyclone plant of this kind, which is compact, is suited for relatively long hydrocyclones, and enables easy servicing of the individual hydrocyclones.
SUMMARY OF THE INVENTION
In accordance with the invention, the foregoing object is obtained by means of a hydrocyclone plant of the kind initially stated, which mainly is characterized in that the groups of hydrocyclones are distributed around the cylindrical heavy fraction space in the circumferential direction and are spaced from one another in the inlet space to allow the liquid mixture to flow between adjacent groups of hydrocyclones.
Each group of hydrocyclones preferably comprises three hydrocyclones, and is releasably attached to said walls.
Each hydrocyclone is suitably designed with a cylindrical chamber, which communicates directly with the inlet and the light fraction outlet, and a tapered chamber, which communicates directly with the heavy fraction outlet, the cylindrical chambers in each group of hydrocyclones extending in parallel with one another, whereas the centre axes of the tapered chambers of the group converge in direction towards the apexes of the tapered chambers. In this manner the hydrocyclones of each group of hydrocyclones can be packed closer to one another.
In each hydrocyclone the central axis of the cylindrical chamber and the central axis of the tapered chamber suitably form an angle to one another, such that in an axial section through the hydrocyclone the wall of the chambers coincide with a straight line.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described more closely with reference to the accompanying drawings in which:
FIG. 1 schematically shows a section of a hydrocyclone plant according to the invention;
FIG. 2 is a section along the line II--II in FIG. 1;
FIG. 3 is a section along the line III--III in FIG. 1; and
FIG. 4 is a section along the line IV--IV in FIG. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The hydrocyclone plant shown in the figures comprises a number of elongated hydrocyclones 1 arranged in groups of three hydrocyclones. Each hydrocyclone 1 has a separation chamber consisting of a cylindrical chamber 2 and a conical chamber 5. The cylindrical chamber 2 has a peripheral inlet 3 for a liquid mixture to be sep
REFERENCES:
patent: 3486618 (1969-12-01), Wikdahl
patent: 4189377 (1980-02-01), Dahlberg et al.
patent: 4190523 (1980-02-01), Niemeijer
patent: 4260480 (1981-04-01), Lewis et al.
patent: 4285706 (1981-08-01), Dehne
patent: 4372845 (1983-02-01), Fecske
patent: 4426283 (1984-01-01), Fecske
Andersson Roine
Rundqvist Lars-Goran
Celleco-Hedemora AB
Dayoan D. Glenn
Nguyen Tuan N.
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