Backwash arrangement for cleaning a cylindrical filter screen
AssigneeYamit Filtration & Water Treatment Ltd.
InventorsArie Mauda, Oded Elish, Rey Zeeman
Life of this patent
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Abstract
A backwash arrangement for cleaning a cylindrical filter screen includes a cylindrical filter screen within which extends an axial central conduit. A number of radial branch conduits extend outwards from the central conduit towards the cylindrical filter screen, each provided with a spring-loaded nozzle arrangement. The spring-loaded nozzle arrangement is biased into contact with the cylindrical filter screen, and includes a nozzle opening for passing across the cylindrical filter screen, and a pair of wheels deployed on opposing sides of the nozzle opening for rolling engagement with the cylindrical filter screen.
Claims9
A backwash arrangement for cleaning a cylindrical filter screen, the backwash arrangement comprising:
- (a) a cylindrical filter screen;
- (b) a central conduit extending axially within said cylindrical filter screen;
- (c) a plurality of radial branch conduits extending outwards from said central conduit towards said cylindrical filter screen;
- and
- (d) a spring-loaded nozzle arrangement associated with each of said radial branch conduits, said spring-loaded nozzle arrangement being biased into contact with said cylindrical filter screen, wherein said spring-loaded nozzle arrangement comprises:
- (i) a nozzle opening for passing across said cylindrical filter screen, and
- (ii) a pair of wheels deployed on opposing sides of said nozzle opening and deployed in rolling engagement with said cylindrical filter screen,
- wherein said nozzle opening and outer edges of said wheels are at the same level to a precision of less than 1 millimeter difference.
Dependencies are inferred from the claim text.