Liquid purification or separation – Flow – fluid pressure or material level – responsive – Filter cleaning
Patent
1984-03-01
1984-12-11
Therkorn, Ernest G.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Filter cleaning
210137, 210138, 210143, 2101952, 2102572, 21033301, 2104332, B01D 1300, B01D 3100
Patent
active
044876890
ABSTRACT:
First and second identical filters (6, 20) are connected in series. A backpressure unit (30) for intermittent backwashing is connected to the outlet from the second filter. Means are provided for measuring or setting the pressure P.sub.1 at the inlet to the first filter, the backpressure P.sub.2, the pressure P.sub.3 of the liquid between the two filters and the pressure P.sub.4 at the outlet from the second filter. Means (34) determine A=P.sub.1 -2P.sub.3 +P.sub.4, and B=(K/2N)(P.sub.2 -2P.sub.1 +P.sub.4), where K and N are constant coefficients, and a circuit (35) causes the backpressure unit to apply backpressure for backwashing when A=B. This amounts to comparing conditions in the first and second filters and triggering backwashing only when required, thereby avoiding wasting time with too frequent backwash operations, or conversely with dismantling and regenerating the filters due to too infrequent backwashing leading to clogging that cannot be cleaned by backwashing. The filter is particularly applicable to filtering organic liquids, such as milk, wine or beer.
REFERENCES:
patent: 2569748 (1961-10-01), De Grave
patent: 3398088 (1968-08-01), Okwy
patent: 3992301 (1976-11-01), Shippey
Compagnie Generale D'Electricite
Therkorn Ernest G.
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