Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1990-12-18
1992-10-06
Dawson, Robert A.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210 89, 210 90, 210106, 210141, 2103232, 210340, 210354, 55284, B01D 2448, B01D 2400
Patent
active
051528959
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention has for aim a method of filtration of a fluid, generally rough water or dirty water, and a filter to carry it out.
BACKGROUND OF THE INVENTION
In a general way quick filters (Strainer) which are automatic are equipped with mechanical systems which are motorized to ensure their cleaning. These mechanical systems necessitate plurimetallic constructions which form corrosive electrolytic couples. On the other hand the frictions in dirty water containing very often sand cause a very rapid wearing off of the apparatus.
Finally, these "strainers" are always cleaned by means of a counter current (Back-Wash) which is a drawback particularly when there are fibers creating a mat or interlace within the filtrating elements.
Swiss patents 516 331, 532 409 and 597 894 have presented an automatic filter having none of these three drawbacks, no complicated mechanics, no "Back-wash." The use of this system has demonstrated its security and riability.
These filters which constitute an important technical progress over the preceeding filters have nevertheless certain drawbacks which are the following: obtain a non-stop filtration it is necessary to have multi-element filters therefore equipped with several valves. The more elements there are, therefore valves, the more the influence of the cleaning of the filtrated outflow is low, but the more the filter is expensive for its construction and installation. workshop and uses high quality materials, in principal stainless steels, which leads to a high manufacturing cost of the filter.
OBJECTS OF THE INVENTION
The present invention aims to obviate to the precited drawbacks.
The present invention has for its object a method of filtration of a fluid as well as a filter to carry it out which distinguishes itself by the features described and claimed in the following.
BRIEF DESCRIPTION OF THE DRAWINGS
The attached drawing shows schematically and by way of example two embodiments of a filter according to the present invention.
FIG. 1 is a longitudinal cross section of the filter.
FIG. 2 shows the actuating wheel of the filter distributor seen from the side.
FIG. 3 is a cross section along line III--III of FIG. 1.
FIG. 4 is a top view of the plate located upstream of the filter.
FIG. 5 is a longitudinal portion cross section of the filter shown at FIG. 1, at a greater scale.
FIG. 6 is a cross section along line VI--VI of FIG. 5.
FIG. 7 is a partial longitudinal cross section of the filter, at the scale of FIG. 5, the rotor of the distributor being in an other angular position and the axis of the rotor being taken out.
FIG. 8 is a top view of the rotor of the distributor.
FIG. 9 is a view from underneath of the distributor.
FIG. 10 is a top view of the distributor without its rotor.
FIG. 11 is a longitudinal cross section of the downstream portion, comprising the distributor of the filter according to a second embodiment.
FIG. 12 is a transversal cross section of the filter along line II--II of FIG. 11.
FIG. 13 is a top view of the distribution rotor of the FIG. 11.
FIG. 14 is a side view of the rotor seen from A on FIG. 13.
SUMMARY OF THE INVENTION
Generally speaking the "universal filter" does not exist since the filtration may be very diversified. However, it seems possible to approach the "Ideal Filter" in a given field of the filtration.
The objective of the present invention is to obtain an economic automatic filter, as reliable as the one described in the precited patents. This filter shall also be inserted in a duct having the same or sensibly the same diameter, which is for example, oblique or vertical. The evacuation of the impurities shall be done through only one branchpipe taking out a cleaning or flushing flow, without stopping or disturbing the filtration and the main circuit of fluid flow.
Moreover this filter has to be economical and this is obtained here thanks: constructed, in an elaborate manner out of relatively costly materials (stainless, steel for example), but their repetitive manufacture enables series
REFERENCES:
patent: 3169109 (1965-02-01), Hirs
patent: 3356215 (1965-12-01), Miles, Jr.
patent: 4439327 (1984-03-01), Muller
patent: 4781825 (1988-11-01), Grimes et al.
patent: 4876006 (1989-10-01), Ohkubo et al.
patent: 5074895 (1991-12-01), Hunsberger
Dawson Robert A.
Fortuna Ana M.
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