CA1132915A

CA1132915A - Filter support of plates for filter presses and filters

Info

Publication number: CA1132915A
Application number: CA345,394A
Authority: CA
Inventors: Lubomir Kupf; Radomil Adamek; Mirko Mursec
Original assignee: Statni Vyzkumny Ustav Materialu
Current assignee: Statni Vyzkumny Ustav Materialu
Priority date: 1980-02-11
Filing date: 1980-02-11
Publication date: 1982-10-05

Abstract

ABSTRACT OF THE DISCLOSURE:
A filter support of plates for filter presses and filters for filtering over a filter wall, for instance over a filter cloth or filter paper provided with regularly oriented projections, the upper surfaces which are in contact with the filter wall, provided with grooves.

Description

~13Z915 The present invention relates to a filter support of plates for filter presses and filters for filtering over a fil-ter wall, for instance over a filter cloth or filter paper, which filter support is advantageously made of plastics. The draining arrangement of the filter support comprises regularly oriented projections of geometric shapes.
At present, supports for the plates for filter presses and filters with different types of draining arrangements are used. As a draining arrangement, a system of projectlons support-ing the filter wall and a system of channels serving for removal of filtrates ~etween said projections is employed. A commonly used draining arrangement uses vertical grooves at both sides of filter press plates, particularly wooden filter press plates and plates made of polypropylene. Some filter press plates made of plastics are also provided with inclined grooves, with cylin-drical projectlons and projections in the shape of truncated . pyramids. Another draining arrangement uses truncated pyramids with channels with two different depths for removal of filtra-tes.
All of the above-mentioned draining arrangements ha~e the common drawback that the surface of the projections on which the filter wall bears is smooth, flat or slightly convex and the filter wall bears on this surface rather tightly due to the filter pressure. At places where the filter wall is in contact with the projections of the draining arrangement, the speed of filtration is reduced, such reduction being larger, the thinner the filter wall is and the larger the surface of the projections.
Recently, thinner~ harder and rather denser filter walls are used which are made of synthetic fibers. These walls are smoothed by calendering them from one or both sides in order to achieve anti-adhesive properties to filter cakes. This kind of filter wall requires a particularly effective draining arrangement.

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It is an object of this invention to provide a support for the plates of filter presses and filters for flltering over '~
a filter cloth or filter paper, which passes the fil~rate more uniformly over the whole filtering surface. The filter support according to this invention is provided with regularly oriented projections of geometric shapes, for instance cylinders, prisms, truncated pyramids or conesj the upper surfaces of which are flat or slightly convex, the upper surfaces of this draining arrangement, which are in contact with the filter wall, are pro-vided with grooves.
The filter support according to this invention with , grooved upper surfaces of projections of the draining arrange-ment énables a good removal of the filtrate even from places where the projections are in contact with the filter wall. The grooves can extend in one direction or in two directions which are disposed at an acute or a right angle with respect to each other. It is possible to have the grooves extended in directions which differ from the directions of the warp and weft of the filter cloth so that individual fibers of the filter cloth obtain ~20 a better support.
In accordance with the broad concept of one aspect of the invention, there is provided and claimed herein a fi-lter support for a plate for filter presses and filters for filtering over a filter wall, the support comprising regularly oriented projections of geometric shape, the projections having upper surfaces which are in contact with the filter wall and which are - provided with grooves.
In accordance with the broad concept of a further as-pect of the invention, there is provided and claimed herein a filter support for a plate for filter presses and filters for filtering over a filter wall, the support comprising: a base, spaced projections upstanding from the base and terminated by

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substantially flat upper surfaces adapted to come in contact with the filter wall, and grooves cut through the flat surfaces.
Examplary embodiments of a filter support according to this invention are indicated diagrammatically in the atta-ched drawing, wherein:
Fig. 1 is a top view of a first embodiment of a draining arrangement wherein the upper surface is provided with grooves extending in one direction, a further view below the top view showing a cross section thereof ;
Fig. 2 is a top view of a second embodiment of a e draining arrangement, the upper surface of which is provided with grooves in two directions, a further view below the top view showing a cross section thereof.
The support for plates of filter presses and filters according to Fig. 1 is provided with regularly oriented projec-tions 1, having the shape of truncated pyramids arranged in parallel rows with channels 3 between the projections 1, the channels`3 extending at right angles with respect to each other.

The pyramids in each row are disposed at a uniform distance from each other.- The upper surface of the projections 1 of this draining arrangement of the filter support is provided with spaced parallel grooves 2 extending in one direction. The grooves 2 are at an angle of 45 with respect to the same one side of each pyramid. The projections 1 having the shape of truncated pyramids have dimensions of 8 x 8 mm, a height of 4 mm, the grooves 2 are 0,5 mm wide and 0,5 mm deep. The channels 3 have a depth of 4 mm and width of 6 mm.
The support for the plates of filter presses and filters according to Fig 2 has also regularly oriented projections 1 with channels 3 between these projections 1, the latter being disposed as in Fig. 1. The upper surface of the draining arrange-ment of the filter support, which is in contact with the filter wall, has two sets of grooves 2, extending in two different direc-, - 3 , ~13Z915 tions. The graoves 2 extend at angles of 45 and 135 with respect to the channels 3. The dimensions of grooVes 2 of channels 3 and projections 1 of the draining arrangement are the same as in Fig. 1. . .

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Claims

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A filter support for a plate for filter presses and filters for filtering over a filter wall, said support comprising regularly oriented projections of geometric shape, said projections having upper surfaces which are in contact with the filter wall and which are provided with grooves.

2. A filter support for a plate for filter presses and filters for filtering over a filter wall, said support comprising: a base; spaced projections upstanding from said base and terminated by substantially flat upper surfaces adapted to come in contact with said filter wall, and grooves cut through said flat surfaces.

3. A support as claimed in claim 1, wherein said pro-jections and upper surfaces are evenly spaced from one another in parallel rows and said grooves are inclined with respect the orientation of said rows.

4. A support as claimed in claim 3, wherein said grooves are inclined at 45° with respect to said orientation.

5. A support as claimed in claim 3, wherein said grooves are inclined alternatively at 45° and 135° with respect to said orientation.

6. A support as claimed in claims 1, 2 or 3, wherein said surfaces are square and lie in a common plane.