Liquid purification or separation – Filter – Movable medium
Patent
1994-06-02
1996-04-16
Dawson, Robert A.
Liquid purification or separation
Filter
Movable medium
2103601, 210374, 210375, 210402, 210161, 210298, 210398, B01D 3306
Patent
active
055079474
DESCRIPTION:
BRIEF SUMMARY
The invention refers to an apparatus for separating particulate material from a particle-containing liquid, including a cylindrical housing which accommodates a driveable screw conveyor and has at least sections thereof provided with perforations.
In known apparatuses of this type, the essential drawbacks reside, on the one hand, in that the separation of the solids from the liquid is effected only in a small part of the housing, thus achieving only an insufficient separation, and moreover due to the low throughput consuming much time for the separation. On the other hand, most of these apparatuses are of complicated structure so that their initial costs are considerable and because of their complexity are increasingly susceptible to disturbances during operation.
It is an object of the invention to obviate these drawbacks and to propose art apparatus of the above-mentioned type which on the one hand ensures a good separation of the solids from the liquid phase and yet is of simple and cost-efficient structure and on the other hand enables a high throughput.
In accordance with the invention, this object is attained by providing at least the perforation-containing section of the cylindrical housing in form of a driveable drum sieve.
The advantageous arrangement of the driveable drum sieve which forms part of the cylindrical housing accomplishes a separation of solid particles contained in the liquid, with the advance of solids being ensured in a simple manner through the screw conveyor. The throughput can be simply controlled by adjusting the rotating speed of the screw conveyor and suited to prevailing requirements.
It may be further suitable to precede the cylindrical housing which has at least sections provided with perforations by an additional cylindrical housing which preferably is provided across the entire surface area with perforations and is also designed in form of a driveable drum sieve.
Thus, advantageously, a first separation of solid materials such as rocks, household waste, industrial waste, rakings and/or screenings and the like from the liquid phase is initially effected across over the entire length of the preceding drum sieve, with fine particles such as sludge particles, fecal particles and the like remaining in the liquid phase. The advance of the solids by this first drum sieve, which is essentially arranged horizontal and slightly inclined in direction of the succeeding cylindrical housing, is advantageously accomplished by the particle-containing liquid which enters the drum sieve via an inlet part, passes therethrough and takes the solids with it. Since the drum sieve is driveable and includes perforations which are spread over the entire surface area, high screening rates are achieved in a simple manner, and a high throughput is equally simply realized at significant separation of the solids from the liquid phase.
Advantageously, a trough with perforations may be provided to connect both housings with each other.
The provision of a perforated trough as connector of both housings has the advantage that the liquid can flow additionally through these perforations to further enable a screening out of solids from the liquid, with the solids collecting on the bottom of the trough where they can be reached by the screw conveyor and carried off.
According to a further feature of the invention, both housings are arranged to each other at an angle, preferably of about 140.degree..
This measure enables advantageously that the entire particle-containing liquid flowing through the feed inlet is at least once circulated, that is at least once passes either in the housing or in the area of the trough through the perforations so that the solids before being discharged by the liquid are freed from possibly adhering sludge residues, fecal residues or the like, and the particle residues remain in the liquid.
According to a further feature of the invention, spray nozzles may be arranged on the outside of the drum sieves along at least one surface line, preferably however along several surface lines w
REFERENCES:
patent: 4451929 (1985-09-01), Janusch
patent: 5160441 (1992-11-01), Lundquist
Dawson Robert A.
Feiereisen Henry M.
Reifsnyder David
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