Disk filter

Details Disk filter Disk filter

1997-09-24

2000-06-20

Savage, Matthew O.

Liquid purification or separation

Plural distinct separators

Filters

210344, 210345, 210456, B01D 3315

Patent

active

060774282

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a filter for the deposition filtration of suspensions such as juice, wine, beer, chemical liquids or the like having plate-like filter elements stacked one on the other to form a filter pack in a container, each filter element having a hub which is aligned in its position by a shaft passing through the filter pack having a pipe for the unfiltrate passing axially through the hub and a plurality of feed channels uniformly distributed in the circumferential direction of each hub and leading substantially radially outward, which are fed by the inlet line and lead into a distribution ring chamber out of which the unfiltrate flows substantially perpendicular to the hub periphery through an outlet gap lying above the feed channels and radially into the space between adjacent filter elements.
2. Description of the Related Art
Such a disk filter is known from U.S. Pat. No. 4,767,534. Via inlet lines formed in the hub, the material to be filtered is fed to inflow channels, which branch off radially and open into an annular distributor space formed, in each instance, below the filter tray of a filter element. From this annular distributor space, flow occurs directly through the axially disposed filter element, thereby achieving a uniform flow distribution to build up a homogeneous filter cake. The filtrate is drawn through filtrate draw-off channels, which lead into the center of the hub. These known disk filters guarantee good filtration results with a high degree of utilization of the auxiliary filtration substances. In this case, to build up a uniform and stable filter cake, the overall size, type of construction, and the various filtering aids must be adapted.


SUMMARY OF THE INVENTION

An object of the invention is to further develop a known disk filter of the generic type in such a way that, in the case of filter arrangements of differing overall size and type of construction and the use of the most widely varying auxiliary filtration substances, a homogeneous and stable filter cake build-up is guaranteed without requiring extensive adaptation.
According to the invention, this object is achieved via a plurality of plate-like filter elements stacked one on the other to form a filter pack in a container, each filter element having a hub which is aligned its position by a shaft passing through the filter pack, an inlet line for a material to be filtered passing axially through the hub; and a plurality of inflow channels substantially uniformly distributed in a peripheral direction to each hub and leading substantially radially outward from each hub, the plurality of inflow channels being fed by the inlet line and leading into an annular distribution chamber out of which the material to be filtered flows substantially perpendicular to the hub periphery through an outlet gap situated above the inflow channels and radially into a space between adjacent filter elements, wherein, around a periphery of the annular distribution chamber, the outlet gap is divided by a plurality of dividing walls into a plurality of outlet paths aligned substantially parallel to the filter element such that a concentrated radial liquid jet directed approximately parallel to the filter element is formed, by which the material to be filtered is brought into the space between two filter elements.
It has become evident that sectioning the outlet gap, by separating walls, into a plurality of outlet paths promotes a disturbance-free build-up of the filter cake. If, in addition, the separating walls that bound the outlet paths are disposed in such a way that--as seen in plan view onto the hub--each lies between the openings of adjacent inflow channels, then a homogenous, stable filter cake build-up can be achieved, even in the case of disk filters having very large diameters. Thus, the design according to the invention allows the well-established principles of small and medium-sized disk filters to be implemented in large and very large-sized disk filters with low co

REFERENCES:
patent: 4767534 (1988-08-01), Ziller

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