Filter cartridge; features and methods of assembly; filter assemblies; and, filter cartridge combinations
Filter cartridge arrangements, features thereof and assembly for use therewith, are provided. Selected filter cartridge features disclosed are particularly well adapted for use with a safety or secondary filter cartridge, usable with media thereof projecting into an open interior of a main filter cartridge, in use. An example filter cartridge is described, with a non-pleated end and a pleated end, although variations are also described. Advantageous main cartridges are also described. Methods of assembly and systems for use are described.
1. A filter cartridge comprising:
(a) media extending between first and second media ends and surrounding and defining a central axis and an open central interior;
(b) an end piece adjacent to, and extending across, the media second end;
(i) the end piece including: an outer surface directed away from the first media end; and, an inner surface directed toward the first media; and,
(ii) the outer surface of the end piece having a central projection thereon extending in a direction away from the first media end; the central projection defining a central recess therein, on the inner surface of the end piece;
(iii) the central projection having a tip with an aperture therethrough; and
(iv) the end piece having a circular outer perimeter; and
(c) a cushion member positioned with a portion thereof in the central recess and a portion projecting through the aperture in the central projection.
2. A filter cartridge according to claim 1 including:
(a) a radially directed housing seal arrangement.
3. A filter cartridge according to claim 2 wherein:
(a) the radially directed housing seal arrangement is a radially outwardly directed housing seal arrangement.
4. A filter cartridge according to claim 3 wherein:
(a) the cushion member is closed.
5. A filter cartridge according to claim 4 including:
(a) a media support extending from the second end toward the first end of the media.
6. A filter cartridge according to claim 5 wherein:
(a) the end piece of the media support includes an outer surface with a central receiving groove therein surrounding an outer, central, projection.
7. A filter cartridge according to claim 6 wherein:
(a) the central receiving groove is at least 5 mm deep, in axial direction toward the first end of the media, from any immediately surrounding portion of the closed end of the media support.
8. A filter cartridge according to claim 7 wherein:
(a) the outer central projection projects to a tip located axially beyond the second end of the media, from the first end of the media.
9. A filter cartridge according to claim 8 wherein:
(a) the outer central projection projects to a tip at least 5 mm from an immediately surrounding portion of the closed end, in a direction axially away from the open end.
10. A filter cartridge according to claim 1 including:
(a) an end piece adjacent to the second media end; the end piece including: an outer surface directed away from the first media end; and, an inner surface directed toward the first media end; and,
(b) a resilient cushion member arrangement positioned in the central recess and projecting through, and closing, the aperture in the tip of the central projection.
11. An air filter assembly comprising:
(a) a housing defining: an interior, an air flow inlet; and, an air flow outlet;
(i) the housing including a housing base section and a removable access cover;
(ii) the housing including a central cartridge support in the housing base section directed toward the access cover and having an end with a projection thereon; and
(iii) the access cover including a projection extending toward the central cartridge support;
(b) a safety filter cartridge operably and removably positioned within the housing interior;
(i) the safety filter cartridge having an end directed toward the access cover with a closed resilient grommet thereon surrounding the end projection with the central cartridge support;
(ii) the safety filter cartridge being positioned with the central cartridge support projecting into an open filter interior of the safety filter cartridge and engaged by the closed resilient grommet; and,
(iii) the safety filter cartridge including an end directed toward the access cover having an outer surface with a receiver groove surrounding a central projection; and,
(c) a main filter cartridge comprising media surrounding an open filter interior;
(i) the main filter cartridge being operably and removably positioned within the housing interior with media of the safety cartridge projecting into the open filter interior of the main filter cartridge;
(ii) the main filter cartridge including a closed end piece having an inner surface with a projection extending into the receiver groove on the outer surface of the safety cartridge end;
(d) the access cover being positioned with the central projection extending into the receiver groove of the safety filter cartridge.
12. An air filter assembly according to claim 11 wherein:
(a) the safety filter cartridge includes an end directed toward the access cover with a projection having a tip with an aperture therethrough;
(i) the central projection on the central cartridge support projecting completely through the aperture in the tip of the projection in the safety filter cartridge; and,
(ii) the aperture in the tip of the projection in the safety filter cartridge being closed by the resilient cushion member.
13. An air filter assembly according to claim 12 wherein:
(a) the central projection on the central cartridge support includes a tip and a neck section;
(i) the neck section having a narrower cross-sectional dimension than a dimension of the central projection, on the central cartridge support, adjacent the tip.
14. An air filter assembly according to claim 13 wherein:
(a) an interference fit is provided between the tip of the central projection on the central cartridge support, and the safety filter cartridge, by the tip and the neck section.