| 摘要 |
A self-cleaning canister type filter (1). A cylindrical canister enclosure (3) has, at one end, end plate (2) with fluid inlets (4) and outlet (6) therein. A spring-loaded hollow annular piston (30) is slideably mounted on the exterior of central tubular cylinder (10) and within upper cylinder (28) for a downward movement against compression spring (32) to initially force a back-flow of filtered fluid through filter element (14), lifting contaminant particulate solids from its filtering surface (15). Inlet valve opening (64) is opened to fluid flow when piston (30) attains a compressed position. Filter element (14) is closely spaced to canister enclosure inner wall surface (9) for rapid flow of fluid over the inlet surface (15) of the filter element (14) to scour solids to sump (5) in the lower portion of the canister enclosure (3). A lower spring-loaded piston (18) communicates with sump (5) and is forced upward by entering contaminated fluid until an attached sleeve valve piston (23) slideably mounted in tubular cylinder (10) opens to permit filtered fluid to exit the filter (1), resulting in normal filtration flow of fluid through filter element (14). |
