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Filter arrangement
| Details |
Inventors: Appenzeller, Valentin; Hartmann, Werner; Kutz, Johannes;
Assignee: Kusters; Eduard (Krefeld, DE)
Primary Examiner: Sever; Frank
Assistant Examiner:
Attorney, Agent or Firm: Kenyon & Kenyon
In a tubular filter bodies with at least one tubular filter structure with a porous wall, through which a liquid passes substantially radially, particles above a given size being held back at the entrance surface, made of porous plastic, ceramic material, metal, graphite, etc, continuous operation at constant pressures is made possible by providing at least one groove (or slot) which is closed toward the outside and forms a forced flow path leading from an inlet to an outlet in the circumferential entrance surface of the tubular filter body. |
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DETAILED DESCRIPTION It is an object of the present invention to develop a filter arrangement of the type mentioned at the outset in such a manner that continuous operation at constant pressures is possible.
According to the present invention, this problem is solved by providing at least one groove (or slot) which is closed toward the outside and forms a forced flow path leading from an inlet to an outlet in the circumferential entrance surface of the tubular filter body.
Two things are achieved by the groove or grooves: First of all, a flow path along the surface, through which the entire quantity of the liquid to be filtered must pass with relatively narrow flow cross sections, is obtained.
The liquid to be filtered has an opportunity to make good contact with the entrance surface, which is provided by the walls of the grooves.
The liquid to be filtered is in motion everywhere relative to the entrance surface, so that the particles held back there, which have been separated from the filtrate by the material of the filter body, are immediately washed away and remain in suspension or in solution in the concentrate.
This effect can be aided by designing the grooves so that the flow becomes as turbulent as possible in order to prevent the formation of laminar boundary layers with practically unmoved zones near the walls at the entrance surface.
Thus, the parts of the entrance surface cannot form so-called dead zones, in which separated particles accumulate and form a layer due to lack of removal, nor will substantial portions of the liquid fail to make contact with the entrance surface by remaining inside a stream of liquid with a large cross section.
The other effect of the grooves consists of the enlargement of the entrance surface of a filter body with otherwise the same outside dimensions over a plain cylindrical entrance surface.
This is important particularly in the case where the filter body proper supports a filter diaphragm at the entrance surface.
This increases the throughput capacity with the input pressure remaining the same
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Molecular Biology 
