Liquid purification or separation – Processes – Separating
Patent
1996-04-24
2000-10-10
Popovics, Robert J.
Liquid purification or separation
Processes
Separating
210797, 210798, 21033301, 210411, 55294, 55302, B01D 4604
Patent
active
061298522
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to flow control systems for controlling direction, pressure and effect of the airflow utilised to clean filter cartridges in filter cartridge cleaning systems.
BACKGROUND ART
Conventional cartridge filters are generally in the form of elongated cylinders open at one end and closed at the other, and are cleaned by a reverse pulse of air. This air is generally emitted from a blow tube into the open end of each cartridge. Airflow control and direction modifiers such as venturis, although widely used, do not substantially improve on the cleaning effectiveness.
A particular difficulty experienced by such cleaning system is that a portion of the cartridge, particularly that portion closest to the source of reverse flowing air, does not experience any cleaning at all, whereas that portion that is cleaned tends to be over cleaned and becomes cumulatively damaged as a result.
Tests conducted on cartridges in reverse pulse cleaning systems have shown that along the internal length of the cartridge, cleaning pulse pressures vary markedly. Observation shows an excessive positive air pressure is applied to part of the filter which over cleans, whilst at other parts (which are generally closest to the reverse pulse source) are subject to a low or even negative pressure, which results in a poor cleaning at those parts.
One possible solution to this difficulty is described in German Specification DE4308286A1 of Bissinger GmbH. In this specification there is disclosed the use of a conical element which is interposed between an outlet nozzle and the inlet to a filter cartridge. DE4308286 teaches that the effect of the cone is to produce a sufficient pressure to be built up along the entire length of the filter element. This pressure produces a reverse air flow through the filter element to dislodge particles on the outside of the filter cartridge element.
A conical element similar to DE4308286 has been shown in tests conducted by the applicant to be ineffective as the minimum nozzle orifice diameter increases and the air flow rate increases.
It is unknown as to why such a result occurs, however it does cause a difficulty to the filter cleaning industry in that the cone of DE4308286 is not useful under the current range of conditions that are utilised in the filter cleaning industry.
OBJECT
It is an object of the present invention to provide an flow control member which is suitable across the range of commercially used nozzle sizes and cleaning air flow rates used in cartridge cleaning systems.
SUMMARY OF INVENTION
The invention provides a flow control member for a cartridge cleaning apparatus, said apparatus being of the type that utilises compressed air directed into the open end of a cartridge filter; said flow control member being adapted to be positioned in a cleaning air flow directed toward said open end, said flow control member adapted to modify said cleaning air flow so that the internal portions of said cartridge are subjected to substantially uniform pressure exerted by said cleaning air flow, said flow control member including a divergent portion having a crest facing the direction of said air flow and a flow redirection surface adapted to redirect said air flow after it has passed over said divergent portion from which extends an air flow redirection surface and before it exits the cartridge filter.
Preferably the flow control member is positioned in the air flow entirely externally of the filter cartridge.
Preferably the divergent portion is substantially curved.
Preferably the divergent portion is substantially a cone.
Preferably the divergent portion is substantially a pyramid.
Preferably the air flow redirection surface is substantially cylindrical portion.
Preferably the air flow redirection surface is a substantially curved surface when viewed in cross section.
Preferably the air flow redirection portion is a frusto-conical portion.
Preferably the air flow redirection surface extends a distance of greater than 5 millimeters.
Preferably the distanc
REFERENCES:
patent: 4155850 (1979-05-01), Rathbone et al.
patent: 4280826 (1981-07-01), Johnson, Jr.
patent: 4504288 (1985-03-01), Kreft
patent: 4539025 (1985-09-01), Ciliberti et al.
patent: 4731100 (1988-03-01), Loeffelmann et al.
patent: 4836834 (1989-06-01), Steele
patent: 5002594 (1991-03-01), Merritt
patent: 5199965 (1993-04-01), Van Ackeren
Elliott Jeff
Wilson George
Goyen Controls Co. Pty Ltd.
Popovics Robert J.
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