| 摘要 |
An improved self-cleaning fluid filter (10) is disclosed having a housing (12) with spaced inlet and outlet ports (14, 16) formed in a common wall (18) of the housing (12). The filter (10) further includes a first sleeve (48) extending from the housing's common wall (18) in which the outlet port (16) is formed. An interior chamber within the first sleeve (48) communicates with the outlet port (16), and the first sleeve (48) has a narrowed portion (52) proximate the outlet port (16). The narrowed portion (52) of the first sleeve (48) has at least one orifice (102) formed therein. The filter (10) further includes a second sleeve (60) extending from the common wall (18) and generally concentrically encircling an axial portion of the narrowed portion (52) of the first sleeve (48). A generally annular space (72) is, thereby, defined between the first and second sleeves (48, 60). A generally cylindrical filter cartridge (62) encircles an expanded portion (54) of the first sleeve (48) and is disposed for telescoping movement relative thereto. The filter cartridge (62) is normally biased to a primary position thereof wherein a piston surface (66) forming a part of the filter cartridge (62) occludes the annular space (72). The inlet port (14) communicates with the space (72). The filter (10) further includes a valve member (90) received within the first sleeve (48) and disposed for axial movement relative thereto. The valve member (90) moves relative to the first sleeve (48) in response to fluid flow inducing a pressure upon a diaphragm piston (92) to which it is interconnected.
|
