Arrangement for an inlet pipe in a rotating drum sieve

Details Arrangement for an inlet pipe in a rotating drum sieve Arrangement for an inlet pipe in a rotating drum sieve

1989-08-29

1991-08-20

Dawson, Robert A.

Liquid purification or separation

Filter

Movable medium

209284, 210456, B01D 3311

Patent

active

050412230

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to an arrangement for an inlet pipe in a rotating drum sieve for the supply of sludge or a liquid mixed with particles to the inside of the rotating drum sieve, which drum sieve exhibits flow openings along its casing, in order to permit the separation of liquid from the sludge, etc., supplied to the internal space of the drum via a number of discharge openings extending along the longitudinal axis of the drum and capable of being accommodated in the internal space of the drum, in conjunction with which the inlet pipe exhibits at least two discharge openings situated on levels separate from one another for the purpose of supplying sludge, etc., to the internal space of the drum.
Inlet pipes of the kind indicated above function excellently with regard to their high capacity for the sludge, etc., supplied. In the case of small flows, however, a plug of screenings can form inside the pipe, which plug is not washed away by small flows, unlike in the case of medium or maximum flows. This means that the liquid present in the sludge, etc., strikes the plug which has formed inside the inlet pipe and is discharged through any spillway which may be provided in the drum sieve plant.
Plug formation inside the pipe has caused liquid to flow at a concentrated rate out towards the sieve casing, with the result that the screenings have been less well drained, or, in other words, the sieve has not achieved its indicated capacity under conditions of peak load.
Screenings find their way into the sieve casing as the drum rotates, and drop down into the inlet pipe. These screenings then slide along the inlet pipe, and it is possible to demonstrate that they have dropped down into the spillway at a number of installations, due to the inclination of the pipe and the sieve.
In the case of sieves which are connected to an inlet box, the liquid remains in the pipe up to a level of half its diameter. This is of no consequence to the pipe, although it does create problems in connection with any work which requires to be carried out on the inlet box, since quite a considerable quantity of water is left in the bottom.
The principal object of the present invention is thus, in the first place, to make available an arrangement which solves said problems in such a way that one and the same inlet pipe is able to cope with all kinds of flow from 0 up to the maximum throughput of the sieve, with all the problems previously caused by the screenings removed by sieving.
Said object is achieved by means of an arrangement in accordance with the present invention, which is characterized essentially in that the inlet pipe is freely open towards the top along said discharge openings, at least to the level of the discharge opening situated in a higher position.
The invention is described below as a preferred illustrative embodiment of an arrangement for an inlet pipe, in conjunction with which reference is made to the drawings, in which:
FIG. 1 shows in perspective an inlet arrangement arranged in accordance with the present invention, viewed at an angle from the front;
FIG. 2 shows a sectioned view of the arrangement;
FIG. 3 shows the arrangement in its operative position with a small flow;
FIG. 4 shows the arrangement in its operative position with a large flow;
FIG. 5 shows the arrangement in schematic form installed in a drum sieve;
FIG. 5A shows the arrangement from above;
FIG. 6 is a section along line VI--VI in FIG. 5A;
FIG. 7 is a section along line VII--VII in FIG. 5A;
FIG. 8 is a section along line VIII--VIII in FIG. 5A;
FIG. 9 is a section along line IX--IX in FIG. 5A.
An arrangement 1 for an inlet pipe 2 arranged in accordance with the present invention, which inlet pipe is suited to the supply of sludge 3 or a similar liquid mixed with particles to the inside 4 of a rotatably driven drum sieve 5, which along its casing 5A exhibits appropriate passageways 6 to permit the flow of sieved liquid 7 from the inside 4 of the drum, for the purpose of enabling effective separation of the liquid 7 from any screenings w

REFERENCES:
patent: 3163601 (1964-12-01), Ericcson et al.
patent: 3695448 (1972-10-01), Johansson
patent: 4236999 (1980-12-01), Burgess et al.
patent: 4507202 (1985-03-01), Nord et al.
patent: 4597865 (1986-07-01), Hunt et al.

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