Liquid purification or separation – Flow – fluid pressure or material level – responsive – Filter cleaning
Patent
1987-07-28
1990-05-15
Lacey, David L.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Filter cleaning
210111, 210113, 210193, 210223, 21033301, 210354, 210356, 210391, 210398, 210407, 55305, 55350, 55482, 55485, B01D 3300, B01D 2912
Patent
active
049255509
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to cleaning fluid media (liquid and gaseous), and more particularly concerns a batch-action apparatus for filtering a fluid medium. The apparatus can also be used for separating a fluid medium into fractions in a range of industrial applications.
BACKGROUND OF THE INVENTION
At present, cleaning liquids and gases from various impurities, and separating substances into fractions poses a serious problem. The problem is especially acute when cleaning gases and sewage water in the chemical and petroleum refining industires, in cattle-raising farms, public utilities, ferrous and non-ferrous metallurgy.
There are known apparatus for filtering liquid and gaseous media, each such apparatus comprising a housing accommodating a filtering element and communicating with systems for feeding a medium to be filtered, discharging the clean medium, and evacuating filter cake. Depending on the type of the medium being filtered, used is generally made of filtering elements of a range of designs, such as endless belts, mashes, permeable membranes, etc.
For example, there is known a batch-action apparatus (SU, A, 109199) for cleaning fluid media, in which bag-type filtering elements are secured on two plates of which one such plate is capable of movement for periodically shaking filter bags to remove filter cake from their inside surface.
These apparatus are, however, bulky and inefficient, whereas the filter bags have a tendency to foul and therefore fail to carry out their function; another disadvantage being that the mechanism for shaking the filter bags is also prone to premature failure.
There is known an apparatus (SU, A, 117204) for filtering a fluid medium (liquid) the housing of which accommodates a flexible filtering element in the form of a flexible bag-shaped vessel of a filtering material an open end of which is secured to the housing. The bottom of the vessel is connected by a tie rod to a hoisting mechanism serving to turn the vessel inside out to remove filter cake; this vessel being thus capable of movement relative to the point of its attachment.
The apparatus is structurally simple, although inefficient, since during feeding a batch of the liquid to the vessel cake build-up and clogging of the filtering surface hampers the filtration process, and therefore the vessel needs frequent turning inside out to evacuate the filter cake, which is time consuming.
SUMMARY OF THE INVENTION
The invention is directed toward the provision of a batch-action apparatus for filtering a fluid medium (liquid or gas) in which a flexible filtering element would be so constructed as to enable, depending on filter cake build-up and the extent to which the filter surface is clogged therewith, to automatically place clean portions of this element to the filtering zone, which ensures higher efficiency, simpler operation, and more reliable cleaning of the filtering surface.
The aims of the invention are attained by that in a batch-action apparatus for filtering a fluid medium comprising a housing communicating with systems for feeding a fluid medium to be filtered, discharging the clean medium, and evacuating filter cake, and a flexible filtering element secured to the housing and moved relative to the point of attachment thereof by a hoisting mechanism, according to the invention, the housing is hermetically sealed and is divided by the flexible hose-shaped filtering element into two chambers, of which the upper chamber accommodates the hoisting mechanism to which the flexible filter hose is connected by one end, whereas the other end of the hose is turned inside out to be secured to the circumference of the housing forming about the rest of the hose an annular cavity changing in volume as filter cake builds up therein and the hose is moved by the hoisting mechanism, the upper chamber communicating with the system for evacuating filter cake.
The hermetic sealing of the housing makes it possible to use the apparatus for filtering acrid or poisonous media, an overpressure can be further
REFERENCES:
patent: 34499 (1862-02-01), Holmes
patent: 3931015 (1976-01-01), Jenkins
patent: 4131546 (1978-12-01), Olsson
patent: 4283281 (1981-08-01), Cogan
patent: 4370153 (1983-01-01), Russell
Kryazhevskikh Nikolai F.
Shapovalov Jury P.
Shishkin Viktor V.
Lacey David L.
Lithgow Thomas M.
LandOfFree
Batch-action apparatus for filtering fluid medium does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Batch-action apparatus for filtering fluid medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Batch-action apparatus for filtering fluid medium will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-619931