Liquid purification or separation – Filter – Medium – cleaner or agitator moved by fluid
Patent
1998-09-14
2000-03-28
Lithgow, Thomas M.
Liquid purification or separation
Filter
Medium, cleaner or agitator moved by fluid
2103232, 21033301, 210458, 21049701, 2104971, 210489, B01D 2917, B01D 2952, B01D 2970
Patent
active
06041944&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a multiple tube filter, consisting of at least one perforated filter element, wherein the outside of the filter element has spirally circulating grooves.
DE-OS 15 36 928 discloses a filter cartridge, as well as a filter element for use in this filter cartridge. The filter cartridge consists of a support sleeve made of plastic, which has been pushed into a tube-shaped filter sleeve of a felt material and is tightly enclosed by it. The support sleeve is perforated for the filtrate to run off. In one embodiment the support sleeve has a net-like appearance. To this end, two groups of rods bent into a spiral shape are arranged in such a way that their rises respectively extend in opposite directions. The rods are respectively connected with each other at their intersection points, which results in a net-like structure. The support sleeve is inserted into a tube-shaped filter sleeve of non-self-supporting needled felt, wherein the needled felt has such a high degree of inherent stiffness that the filter sleeve has a rigidity which is sufficient for maintaining its shape.
It is disadvantageous in respect to such a filter sleeve that a filter cake built upon the filter sleeve is not supported. There is therefore the danger that in the dried, shrunk state the filter cake collapses on itself. Then the flushing of the filter cake is only possible in a limited way, since the flushing liquid mainly runs off in the uncovered areas of the filter, while there is no flow through the filter cake, which lies in the lower area of the filter.
SUMMARY OF THE INVENTION
Based on DE-OS 15 36 928, it is therefore the object of the invention to make available a filter element for a multiple tube filter in which the filter cake is sufficiently stabilized, even in a dried and shrunk state, so that subsequent flushing with a solvent can be performed without problems.
This object is attained in that in a plane imagined perpendicularly in relation to the grooves the profile of the surface is arched outward in the shape of a segment of a circle between the grooves.
The surface with which the filter cake adheres to the filter element is advantageously increased by this, furthermore, the filter cake is additionally supported opposite the direction of gravity. The filter cake is sufficiently supported even after drying, i.e. after the appearance of cracks in the filter cake, and therefore cannot collapse on itself. It is therefore possible to perform flushing after drying without problems.
The production of the filter element becomes more cost-effective in that the exterior of the filter element consists of a partial surface of at least one spirally formed tube. Methods are available for the cost-effective production of tubes, which thus can be used for producing the filter element.
If a central shaft is embodied as a linear central tube, the structure of the filter element is additionally stabilized. Caps can be respectively placed on the ends of the central tube, which close off the filter element at the top and the bottom. During operation, the central tube absorbs the forces resulting from the pressure difference.
A good support of the filter cake is obtained, if the spirally circulating groove has a rise between 5.degree. and 60.degree., the best support is achieved, if the spirally circulating groove has a rise of 30.degree..
The production of the filter element can be further simplified, if the outsides of the tubes are connected with each other. In this way it is possible to produce a tube bundle as a connected part on one work step, for example by extrusion.
The filter element is given a particularly high resistance to aggressive chemicals, if the filter element is made of a polymeric plastic material, preferably polyvinyl difluoride or polypropylene.
The production of the filter element is further simplified, if several tubes are combined into a tube bundle, and the tube bundle is preferably constructed of tubes with the same diameter.
The filter element becomes particularly
REFERENCES:
patent: 2826308 (1958-03-01), Koupal
patent: 3028971 (1962-04-01), Peterson
patent: 3233739 (1966-02-01), Zievers
patent: 3244286 (1966-04-01), Schmidt
patent: 3438502 (1969-04-01), Schmidt
patent: 4443346 (1984-04-01), Muller
patent: 4473472 (1984-09-01), Muller
Lithgow Thomas M.
Mavag Verfahrenstecnik AG
Striker Michael J.
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