Filtering apparatus

Details Filtering apparatus Filtering apparatus

1999-08-30

2001-06-26

Walker, W. L. (Department: 1723)

Liquid purification or separation

Structural installation

Flume stream type

C210S158000, C210S329000, C210S396000

Reexamination Certificate

active

06251268

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a filtering apparatus for separating solid material from a liquid.
BACKGROUND
In many different contexts, there is a need to be able to separate, from liquid flows, matter or bodies accompanying the liquid. To this end, use is made today of different types of filtering or screening apparatuses which, as a rule, are based on the principle that an endless belt provided with filter elements is immersed in the liquid. There are also embodiments in which the filter elements are fixed on two or more endless chains. Moreover, the filter elements are provided with projecting portions which are disposed to lift up the accumulated matter out of the liquid. The projecting portions are generally formed from separate elements.
One problem in prior art apparatuses of this type is that it is difficult entirely to clean the individual filter elements, since they are positioned so close together that, on cleaning, they block one another to some degree or are blocked by devices for lifting up accumulated matter. If the cleaning operation does not function, residual matter on the filter elements will be carried down into the liquid flow behind the filter or screening arrangement and once again pollute the liquid. This is of course a disadvantage.
Another problem inherent in the prior art apparatuses is that a portion of the matter which is separated from the liquid continuously remains in the filter and/or the drive means. In such cases, the risk is imminent that the filter becomes clogged or that the entire apparatus seizes, which may destroy both the drive means and filter components.
SUMMARY OF THE INVENTION
The above-outlined problems are obviated using an apparatus according to the invention.
The apparatus according to the present invention is disposed to feed the filter elements one by one past a scraping and cleaning device.
Because of the fact that the filter elements are separated from one another when they pass the scraping and cleaning device, there will be obtained an extremely effective scraping of accompanying matter, and consequential cleaning of each individual filter element. As a result, a progressive and continuous cleaning of the filtering portions of the filtering apparatus will be achieved.
The filtering apparatus according to the present invention is constructed from a number of individual, discrete elements, for which reason it is simple, when necessary, to repair and possibly replace damaged parts. The apparatus is moreover easy to completely renovate since it is of simple construction both as regards the individual filter elements and the drive means.


REFERENCES:
patent: 3620373 (1971-11-01), Crell et al.
patent: 3755846 (1973-09-01), Sandler
patent: 4597864 (1986-07-01), Wiesemann
patent: 4790934 (1988-12-01), Shishkin et al.
patent: 5565093 (1996-10-01), Frankenberger
patent: 0676227 (1995-10-01), None
patent: 8602014 (1986-04-01), None
patent: 9117807 (1991-11-01), None

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