Filter for liquids

Details Filter for liquids Filter for liquids

1989-06-06

1990-05-01

Jones, W. Gary

Liquid purification or separation

With repair or assembling means

210394, 2104931, 210526, B01D 3318

Patent

active

049216023

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a filter for separating particles from a flow of liquid. More precisely, the filter is of the type comprising a filter drum rotatably mounted about a substantially horizontal shaft and partially immersed into the filtered liquid, said drum comprising a filter cloth forming the circumference of the drum and having a plurality of radially extending sections positioned between two drum ends plates, one of which is provided with a central opening through which the unfiltered liquid enters the interior of the drum; a drive means for slowly rotating the drum; and a device projecting through the end plate opening into the drum above the surface of the liquid flow and adapted to remove the particles carried along by the filter cloth out of the liquid and falling down from the filter cloth in an area around the highest point of the drum.
A filter of this type known from e.g. U.S. patent specification No. 1,945,492 is convenient since it is suited for separating particles from a liquid which are present in a relatively low concentration and must be treated carefully so as not to be dissolved in the liquid.
Up to date, there have, however, been rather few developments of the technique, meaning that a direct application thereof would bring considerable drawbacks in several respects. Thus, the filter cloth in the prior art drums is retained by crossbars, which results in operational drawbacks since dirt pockets are formed around these bars. Such mounting of the cloth also means that the exchange of cloth is time-consuming and normally requires joining of the cloth when positioned in the drum. This prior art mounting of the filter cloth is also not ideal in view of strength, since it is difficult to obtain a uniform stress distribution.
The first object of the present invention therefore is to provide a filter of the type mentioned by way of introduction, which eliminates the above drawbacks of the prior art designs.
According to the invention, this is achieved in that the filter is characterized in that the side edges of the filter cloth are clamped in grooves on the inside of the end plates, and that the end plates are fixed to each other by means of spacer members spaced from the filter cloth. This inventive clamping results in uniform traction along the entire length of the cloth, which makes the stress on the cloth comparatively low, even if the spacer members between the end plates keep the end plates apart by comparatively great force. Further, the dirt pockets in prior art filters, both around the crossbars and where the cloth connects with the end plates, are eliminated. The clamping of the filter cloth also establishes a perfect seal between the cloth and the end plates.
High efficiency in a filter of the type described above requires not only that the particles to be separated are treated carefully, but also that they are removed from the liquid as quickly as possible, such that any components included in the particles and soluble in the liquid do not have time to be dissolved to a larger extent than necessary.
The second object of the invention therefore is to provide a filter as described above, having a high filtering capacity.
According to the invention, this object is achieved in that each radially extending section is shaped so that, during its movement out of the liquid, its last portion leaving the liquid is a portion spaced from the radially inner limit of said section.
By this design, a certain amount of liquid is confined to each radially extending, pocket-like section and is carried along by this pocket out of the liquid. On the way up to the highest point of the drum, a dewatering occurs, and the particles separated remain on the inside of the filter cloth, until they reach the vicinity of the highest point of the drum. This results in a highly efficient separation of particles which are swimming on or close to the surface of the unfiltered liquid flowing into the drum.
To further increase the degree of separation, a tangential elevation, such as a bead, can be ar

REFERENCES:
patent: 1453311 (1920-02-01), Engel
patent: 1576374 (1924-11-01), Spanner
patent: 1945492 (1932-06-01), Lamort

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