Liquid purification or separation – Filter – Medium – cleaner or agitator moved by fluid
Patent
1987-07-24
1989-06-13
Lacey, David L.
Liquid purification or separation
Filter
Medium, cleaner or agitator moved by fluid
210111, 210113, 210354, 210106, 210391, 210398, B01D 3300
Patent
active
048390470
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to liquid cleaning, and more particularly, it deals with an intermittent-action apparatus for filtering liquid and may be used for cleaning industrial effluents from slime, sewerage effluents from solids and for cleaning recirculation and potable water from suspended particles. In addition, the invention may also be used for separating products into liquid and solid phases and for cleaning water reservoirs and canals from sapropel.
BACKGROUND OF THE INVENTION
At present cleaning liquids and gases from various impurities and separating substances into fractions is a very actual problem. The problem of cleaning gases and effluuents is especially acute in the chemical and petrochemical industries, in the agriculture, at animal breeding farms, in the municipal activities and in ferrous and non-ferrous metallurgy.
Widely known in the art are apparatuses for filtering liquid and gaseous fluids, comprising a casing accommodating a filtering element and communicating with systems for supply of fluid being filtered, removal of filtrate and removal of precipitate, respectively. Depending on the fluid being filtered, filtering elements of great variety of design are used such as endless belts, nets, permeable membranes, and the like.
Known in the art is an apparatus for filtering a fluid (liquid) (cf. USSR Inventor's Certificate No. 117204, C1. B 01 D 29/10, 1968) which is an intermittent-action apparatus having a casing accommodating a flexible filtering element in the form of a flexible bag-shaped container of a filtering material having one end thereof secured to the casing. The bottom of the container is connected by means of a pull member to a hoisting gear which is the means for turning the container inside out to remove the accumulated precipitate so that the container is movable with respect to the fixed portion thereof.
This apparatus is simple in structure but it is of a low throughput capacity since when a batch of liquid is admitted to the container the precipitate accumulated in the container and clogging the filtering surface hampers further filtering, and the container is to be frequently turned inside out so as to remove the precipitate, which takes much time.
SUMMARY OF THE INVENTION
The invention is based on the problem of providing an intermittent-action apparatus for filtering fluid which is so constructed that when the filtering surface of a flexible filtering element is clogged fresh portions of the filtering element can be brought into play for filtering and the surface of the filtering member can be reliably washed so as to improve throughput capacity of the filtering apparatus and facilitate operation.
This problem is solved by that in an intermittent-action apparatus for filtering liquid, comprising a casing communicating with systems for supplying fluid being filtered, removing the cleaned fluid and removing precipitate, respectively, and a flexible filtering element which is movable with respect to a portion thereof secured tothe casing, according to the invention, the casing is sealed and a hollow cylinder is installed in the casing to define therewith an annular space communicating with the system for removing precipitate, and the flexible filtering element comprises a hose having one end thereof secured to a driven drum mounted in the upper part of the casing and having a means for controlling the drum torque and the other end thereof which is turned inside out and secured along the perimeter to the hollow cylinder so as to define around the remaining part of the hose an annular space whose volume varies during accumulation of precipitate therein and during the movement of the hose under the action of the drum.
The hose end, which is turned inside out, is preferably secured to the outer periphery of the hollow cylinder.
The provision of the sealed casing makes it possible to build-up an increased pressure of liquid being filtered in the casing so as to contribute to acceleration of filtering. Securing the filtering hose to the hollow cylinder
REFERENCES:
patent: 34499 (1862-02-01), Holmes
patent: 3464561 (1969-09-01), Wrotnowski
patent: 3931015 (1976-01-01), Jenkins
patent: 4131546 (1978-12-01), Olsson
patent: 4370153 (1983-01-01), Russell
Kryazhevskikh Nikolai F.
Shapovalov Jury P.
Shishkin Viktor V.
Lacey David L.
Lithgow Thomas M.
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