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US 9,138,666 B2Granted
Filter with automatic declogging
AssigneeAlfa Laval Moatti
InventorJean-Claude Chrupalla
Life of this patent
Estimating the term…
Abstract
Disclosed is an arrangement of distribution columns that can be used to discharge the declogging fluid from a filter with automatic declogging or backwashing. A stationary divider is arranged coaxially in a stack of filter elements and has distinct ducts, e.g. embodied by fins, the ducts establishing communication between a rotary distributor and groups of passages in the stack that are in alignment along generator lines of the stack.
Claims13
A filter comprising:
- at least one pair of flat filter elements, each filter element having an internal face, an external face, a screen, two concentric circular margins, respectively an inner margin and an outer margin between which said screen extends, and radial ribs regularly distributed circumferentially and extending facing one another on either side of said screen and between said concentric margins in order to form sectors on said internal face and on said external face, said at least one pair of filter elements being assembled one against the other so that said facing internal faces define a space that is radially compartmented by the contacting radial ribs of said internal faces, said outer and inner margins having respective passages communicating with corresponding ones of the sectors;
- parallel distribution columns extending along an axial direction, said parallel distribution columns being separate elements from said at least one pair of filter elements;
- and
- a rotary backwashing distributor having an opening, said rotary backwashing distributor being mounted to rotate so that said opening is periodically and selectively put into communication with each distribution column,
- wherein said parallel distribution columns are embodied by a separate stationary divider arranged coaxially with a stack of said at least one pair of filter elements of said filter, the separate stationary divider having distinct ducts respectively establishing communication between said rotary backwashing distributor and respective passages of the inner margins of the at least one pair of filter elements.
2 more elements
A filter, comprising:
- at least one pair of flat filter elements, each filter element having an internal face, an external face, a screen, two concentric circular margins, respectively an inner margin and an outer margin between which said screen extends, and radial ribs regularly distributed circumferentially and extending facing one another on either side of said screen and between said concentric margins in order to form sectors on said internal face and on said external face, said at least one pair of filter elements being assembled one against the other so that said facing internal faces define a space that is radially compartmented by the contacting radial ribs of said internal faces, said outer and inner margins having respective passages communicating with corresponding ones of the sectors;
- parallel distribution columns extending along an axial direction;
- and
- a rotary backwashing distributor having an opening, said rotary backwashing distributor being mounted to rotate so that said opening is periodically and selectively put into communication with each distribution column,
- wherein said parallel distribution columns are embodied by a stationary divider arranged coaxially with a stack of said at least one pair of filter elements of said filter, the stationary divider having distinct ducts respectively establishing communication between said rotary backwashing distributor and respective passages of the inner margins of the at least one pair of filter elements,
- wherein said ducts are embodied by fins that are regularly distributed circumferentially and that extend in planes containing a longitudinal axis of said filter,
- wherein said stationary divider is constituted by said fins attached to an axial cylindrical core, edges of said fins being in contact with an inner cylindrical surface of said stack of at least one pair of filter elements in such a manner that each distribution column is defined by two adjacent fins and by the inner cylindrical surface of the stack, and
- wherein each free edge of a fin includes a strip extending longitudinally and presenting a cylindrical outer surface having a radius of curvature identical to the radius of curvature of the inner cylindrical surface of said stack, and against which the cylindrical outer surface of the strip bears.
5 more elements
Dependencies are inferred from the claim text.