Liquid purification or separation – Filter – Movable medium
Patent
1987-06-17
1989-05-16
Fisher, Richard V.
Liquid purification or separation
Filter
Movable medium
210400, 2105001, B01D 3304
Patent
active
048307505
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a filter arrangement which consists of a belt filter for the separation of particles from a liquid, for which purpose the liquid is caused to flow in towards the filter through an inlet at one end of the filter, and the separated particles are collected at the opposite end of the filter, in conjunction with which the belt filter consists of at least one endless filter belt which is caused to run over a front and a rear guide roller in the direction of the water as it flows in, and to support and drain the particles as they are conveyed in a desired direction of transport on an upper, forward-moving part of the filter belt from one end to the opposite end over a first drainage zone, whilst cleaned liquid is caused to pass through at least the aforementioned upper part.
BACKGROUND
No effectively functioning separation plant has been available until now for the separation of certain types of impurity particles and sediment, etc., from water in the basins used for special fish breeding. A customary type of plant utilizes rotating filter drums, in which problems with the clogging of the filter surface are encountered, however, in spite of the continuous cleaning of the perforations in the surface of the filter. Belt filters with an endless filter belt running over two rollers are also subject to clogging, unless special measures are taken to prevent this.
TECHNICAL PROBLEM
The object of the present invention is to make available by means of the arrangement in accordance with the invention effectively functioning filtration in which clogging and the associated reduction in capacity are counteracted.
THE SOLUTION
The aforementioned object is achieved by means of an arrangement which is characterized in that a second drainage zone is arranged on the upper part of the belt after the aforementioned first drainage zone by the arrangement on the latter zone of a drainage arrangement which comprises on the one hand a blower unit extending across the entire width of the filter belt and so arranged as to direct currents of air against the under side of the upper part of the belt of the filter belt, and in so doing as to blow water from the belt and the particles over the aforementioned second drainage zone of the belt, and on the other hand a deflector device situated on the upper side of the upper part of the filter belt above the aforementioned blower device and so arranged as to guide the water blown by the current of air in the direction of the aforementioned deflector device back onto the upper side of the filter belt in front of the aforementioned drainage zone, that is to say against the aforementioned direction of transport.
BRIEF DESCRIPTION OF DRAWINGS
The invention is described below in greater detail as an illustrative embodiment with reference to the accompanying drawings, in which:
FIG. 1 shows a diagrammatic side view of a filter in accordance with the invention,
FIG. 2 shows a plan view of the filter, and FIG. 3 shows a diagrammatic view of a part of the filter on an enlarged scale.
BEST MODE OF CARRYING OUT THE INVENTION
As will be appreciated from FIGS. 1 and 2, the filter arrangement in accordance with the invention is of the belt filter type and is constructed from a machine frame 1, in which a front and a rear guide roller 2, 3 are respectively rotatbly supported in bearing blocks 4, 5. In the illustrated example one of the guide rollers 3 is driven by means of an electric drive motor 7 via a gear arrangement 9 with variable speed of roation of the guide roller 3.
Around the two guide rollers 2, 3 there runs an endless filter belt 10, which exhibits an upper, forward-moving part 11 and a lower return part 12. The filter belt 10 consists of a filter screen, which is constructed with advantage from metal wires in the formof meshes.
The belt filter exhibits an inlet 13 to the filter situated at one end of the belt filter above its front guide roller 2. The inlet 13 is executed in the form of the outlet end 14 of a pipe 15 for contaminated
REFERENCES:
patent: 2346500 (1944-04-01), Moore
Jandourek Jiri
Nord Dan
Bat o Fangst AB
Evans Linda S.
Fisher Richard V.
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