Liquid purification or separation – Flow – fluid pressure or material level – responsive – Filter cleaning
Patent
1997-09-19
1999-01-12
Walker, W. L.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Filter cleaning
210332, 210354, 210409, 210413, 210414, B01D 2968
Patent
active
058582177
DESCRIPTION:
BRIEF SUMMARY
The present invention pertains to a tube filter device for the filtration of beer with a filter cartridge that is composed of an upper part with tube filter receiving chamber and underneath that, an outlet chamber.
The use of this kind of conventional tube filter device for the filtration of beer is widespread. The conventional tube filter devices have an essentially cylindrical upper tube filter receiving chamber, in which a number of mutually separated, vertically arranged, rod-like tube filters are provided. Toward the bottom, the tube receiving chamber is formed by a tapered outlet part. Depending on the process stage, various flow media are input and output through several inlet and outlet lines which are provided primarily in the lower and in the upper region of the filter cartridge. Various processes take place in the filtration of beer. First, the filter cartridge is filled from bottom to top with water and the entire system is deaerated. Next, filtration agent, e.g., diatomaceous earth, is introduced into the filter cartridge which floats on the tube filter. In a filtration prephase, the water is forced by the beer from bottom to top out of the filter cartridge, and filtration agent is added in. In a subsequent phase, the actual filtration occurs, in which beer is forced from bottom to top through the tube filter with further addition of filtration agent. Next, the water present in the filter cartridge is displaced by air. The dry filter cake is then knocked off the tube filter, whereupon the filtration agent is removed through another outlet line. Usually, the filter cartridge is filled repeatedly with water and then emptied in order to remove the remaining contamination with filtration agent. However, this process is time-consuming and is associated with a high water consumption.
It has already been proposed to provide a spray strip on the underside of the separating wall to which the tube filters are suspended and to spray water horizontally onto the tube filters for cleaning. However, a disadvantage of this arrangement is that the tube filters cover each other, so that the spray water does not get to all candles, which, in turn, means an unreliable cleaning. But reliable cleaning is indispensable in a beer brewery. Another disadvantage of this device is that the underside of the separating wall and also the cartridge wall are not cleaned of the deposits.
Therefore the present invention is based on the problem of designing a tube filter device that allows a reliable, simple, time-saving and water-saving cleaning.
According to this invention the problem is solved in that underneath the tube filters a supply line with at least one rotary-seated spray arm, which has upward directed spray nozzles, is provided, wherein the spray nozzles are positioned so that during rotation of the spray arm, they produce concentric spray circles which are located essentially between the tube filters, and that also a drive unit is provided for rotation of the spray arms.
The device according to this invention has the advantage that the water from the spray nozzles is sprayed between the tube filters on the underside of the separating wall, so that residual filtration agent is reliably detached and is rinsed off together with the downward flowing water. This arrangement of the spray nozzles assures that the water will cover all gaps between the tube filters. For example, the tube filters are cleaned by the water sprayed upward against the separator wall and dropping off downward, whereby all residues of the filtration agent which have settled on the tube filters are detached and rinsed off downward. Since the water is sprayed upward in the region of the side walls and runs off from them, the side walls of the filter container are cleaned in a dependable manner. Because the filter cartridge need not be entirely filled with water, but rather merely small quantities of spray water are needed, significant water and production costs can be saved. Since the spray arms can rotate with the spray nozzles, the number of the sp
REFERENCES:
patent: 2854091 (1958-09-01), Roberts et al.
patent: 2854142 (1958-09-01), Baker
patent: 4834883 (1989-05-01), Lake
patent: 5062965 (1991-11-01), Bernou et al.
patent: 5681465 (1997-10-01), Takenoya et al.
Anton Steinecker Maschinenfabrik GmbH
Walker W. L.
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