Automatic filter press

Details Automatic filter press Automatic filter press

1991-05-09

1992-10-13

Theisen, Mary Lynn

Liquid purification or separation

Plural distinct separators

Filters

210331, 210334, 210342, 210350, 210396, 210414, 210415, 100112, 100125, 100211, B01D 33073, B01D 3346, B01D 3364

Patent

active

051548259

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a filter press of the type described in EP-A-0 226 659.
The known filter press comprises a cylindrical housing centered about a horizontal axis and containing a plurality of disc-shaped filter elements rigidly supported in parallel side-by-side relationship on a frame disposed in the housing. Disposed between the filter elements are respective disc-shaped rotor elements fixedly secured to a common rotor shaft extending through the filter elements. The rotor elements are provided with press plates adapted to be forced away from one another and into pressure contact with filter cakes accumulated on the filter elements to thereby mechanically compress the filter cakes for removing liquid therefrom. The rotor shaft is axially adjustable for permitting or at least facilitating the removal of the filter cakes from the filter elements by rotation of the rotor shaft and the rotor discs secured thereto.
A filter press of this type may be operated in such a manner that during the filtering operation the rotor composed of the rotor shaft and the rotor discs is rotated, so that in the sludge to be filtered a fluid flow is generated in a direction across the surfaces of the filter elements. This is effective to avoid premature clogging of the filter cloths attached to the filter elements. In this manner it is possible to achieve a continuous clear filtrate output by continuing the filtering operation over an extended period of time. As a result of the construction of this filter press, the transverse flow of the sludge generated by the rotor discs is necessarily of a slower speed at axially inner locations, i.e. adjacent the rotor shaft, than at peripheral locations, i.e. adjacent the cylindrical housing wall. Although these differences of the flow speed could be compensated by the provision that ribs disposed on the rotor discs are of a different shape, specifically a different height at locations adjacent the rotor shaft as compared to locations adjacent the outer rim of the rotor discs, this would result in the space within the filter press being inadequately utilized. In addition, this construction would impair the pressing function to be additionally performed by the rotor discs, because the ribs would restrict the mechanical compression stroke of the rotor disc surfaces as they are forced into contact with the filter cakes.
When in the known filter press the filter cloths have to be replaced, this operation requires the rotor shaft to be dismounted, unless the filter elements are of a construction, specifically a separable construction, permitting them to be removed from the housing without disassembly of the rotor shaft.
It is an object of the present invention to provide a filter press of the type defined in the introduction, wherein the available space within the housing is utilized more effectively, i.e. which permits the size of the filter surfaces to be increased in relation to the housing volume, which permits a uniform transverse flow of the sludge to be obtained across the filter surfaces, and which permits the filter elements, and particularly the filter cloths attached thereto, to be readily replaced.
The invention completely abandons the concept conventionally employed in the filter press technology of employing substantially disc-shaped or plate shaped filter elements, in place of which it employs cylindrical filter elements, or more specifically filter elements in the shape of cylindrical walls of different diameters in a concentrically nested arrangement. The rotor elements disposed between the filter elements are therefore formed as cylindrical wall elements secured to a common transverse mounting structure and extending downwards into the spaces between the filter elements supported on and secured to a common carrier grid. This permits the construction of the filter press to be designed in such a manner that the rotor and the filter elements can be moved apart in the axial direction to thereby make the filter elements--and also the rotor elements--readily accessible for m

REFERENCES:
patent: 651621 (1990-06-01), Black et al.
patent: 3497060 (1970-02-01), Tra et al.
patent: 4366055 (1982-12-01), Gwilliam et al.
patent: 4722789 (1988-02-01), Kupka

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