Cartridge filter with integrated threading having anti-rotation feature

Abstract

A filter includes a casing enclosing a filter cartridge and a removable collection bowl. The filter cartridge includes a filter media ring with upper and lower end caps. The lower end cap of the filter cartridge has a ring-shaped member projecting axially downward. The ring-shaped member has an annular portion with radially inward-directed threads, whereby the collection bowl, with radially outward-directed threads, can be removably attached to the cartridge. The ring-shaped member further includes radial flow passages between the threads and the end cap, whereby contaminants may pass from a peripheral region of the filter element interiorly of the ring-shaped member and downwardly into the attached collection bowl. The filter includes an anti-rotation feature, comprising radially outward-directed keys, disposed circumferentially around the annular portion of the ring-shaped member and projecting radially-outward therefrom, and slots formed on the inside surface of the casing. The keys and slots rotationally fix the filter cartridge with respect to the casing when the cartridge is installed in the casing, such that the collection bowl can be threaded onto and off of the cartridge. The collection bowl and ring-shaped member trap a radially-inward directed portion of the casing and a resilient gasket to fluidly-seal the collection bowl to the cartridge.