Liquid purification or separation – Plural distinct separators – Filters
Patent
1992-12-28
1994-03-22
Dawson, Robert A.
Liquid purification or separation
Plural distinct separators
Filters
210330, 2103331, 210344, 210345, B01D 33327
Patent
active
052961400
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a continuous filtration device, comprising:
barrel-shaped filter cells, each presenting an opening which is placed upwards during filtration and which is covered by a filtering layer, these cells being arranged in a carousel around a vertical axis of rotation and each presenting a horizontal axis of tilt which intersects the axis of rotation of the carousel, their axis of tilt at a tilting point,
follower elements, carried by the lever and placed on it, on either side of the tilting point,
at least one stationary guiding element for each of the follower elements of the lever of a cell, these guiding elements being reciprocally arranged in a carousel area so as to achieve a tilting of each cell inside this area about is axis of tilt,
at least one housing provided in the first of these guiding elements for the corresponding follower element, this housing being placed so as to allow a turning of the lever around the follower element in position in this housing,
at least one loading area which is provided on a second guiding element and on which its corresponding follower element acts when the follower element corresponding to the first guiding element respectively leaves its housing or enters the latter, and
means for rotationally driving (5,6) the filtering cells around the aforesaid axis of rotation (2).
This type of device is already long known, employed in filters, called Bird-Prayon, and put on the market by the firms Bird Machine, Prayon and Process Filtration and Liquid Equipment.
Such filters are used, among others, in industrial plants for the production of phosphoric acid. They permit a separation of solids from liquids, in an ideal way, by means of filtration under vacuum and washing the cake formed in the cells, then a tilting of the cells in order to unload the filtration cake.
During this tilting, the guide rails are, in specific locations, subjected to considerable stresses which can cause shocks and vibrations and lead to rapid wear and tear of the working parts. These stresses take place, in particular, when the back roll of the turning lever of a cell comes into contact with its guide rail, at the time of tilting the latter, or even when the front roll comes into contact with its guide rail, in order to permit the return of the cell to its horizontal position.
The risks of shocks, vibrations and premature wear and tear of the working parts have the effect of limiting the rotational speed of the filter. Thus, as the filtration capacity of a plant is proportional to the square root of the rotational speed of the filter, this is therefore limited too.
A continuous filtration device in a carousel, displaying a tilting stage of the barrels, guided along by means of guide rails with the help of a turning lever, fitted at its two ends with rolls, is described in U.S. Pat. No. 4721566. The rolls and guide rails are subjected to the described stresses here too.
Finally, a device of the same type is also known, which is described in U.S. Pat. No. 3389800. In this device, a tilt of the cells is provided towards the front in the direction of rotation of the carousel, that is to say towards the adjoining cell in the process of being cleaned. For a long time already, a tilting of cells towards the rear has been provided instead, that is to say towards the adjoining cell which still has to be cleaned. The short arm, V-shaped lever, as designed in this U.S. Pat. No. 3389800, while suitable for the tilting of small cells, is no longer suited to great weights and the cell sizes in current plants.
The aim of the present invention is to produce a continuous filtration device in which the disadvantages mentioned above are reduced or overcome. The means provided to solve the posed problem can be applied to known plants with an equipment cost that is as low as possible.
In order to solve these problems, a device has been designed, according to the invention, as described at the beginning, and moreover, comprising:
a first additional lever connected in a fixed way to each filter cel
REFERENCES:
patent: 3830658 (1974-08-01), Davister
patent: 4172791 (1979-10-01), Davister
patent: 4330404 (1982-05-01), Davister
Dawson Robert A.
Walker W. L.
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