Filter cartridges; features and methods of assembly; air cleaner 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) an extension of media surrounding an open interior and having a first end and a second end; and,
(b) an end piece adjacent the second end of the media; the end piece including:
(i) a central region having a central projection extending in a direction away from the first end;
(ii) an outer surface directed away from the first media end;
(iii) an inner surface directed toward the first media end having a central recess therein extending in a direction away from the first media end and surrounded by the central projection; and,
(iv) a resilient grommet having a portion positioned on the central projection and in the central recess to surround a space sized to receive a projection therein when the filter cartridge is installed for use.
2. A filter cartridge according to claim 1 wherein:
(a) the extension of media surrounds a central axis;
(i) the media being pleated adjacent the second end and defining a plurality of inner pleat tips extending at an acute angle, relative to a plane perpendicular to the central axis, of no greater than 89°, in extension toward the first end; and,
(ii) the media being non-pleated at the first end.
3. A filter cartridge according to claim 2 including:
(a) a housing radial seal member positioned at a location within 50 mm of the first end.
4. A filter cartridge according to claim 1 wherein:
(a) the media surrounds and defines a central cartridge axis; and,
(b) the media includes a plurality of inner pleats having inner pleat tips extending at an acute angle within the range of 70°-88°, inclusive, relative to a plane perpendicular to the central axis, in extension toward the first end.
5. A filter cartridge according to claim 4 wherein:
(a) the media includes a plurality of outer pleats having outer pleat tips extending at an angle within the range of 88°-90°, inclusive, relative to a plane perpendicular to the central axis, in extension from the second end toward the first end.
6. A filter cartridge according to claim 1 :
(a) a radially directed housing seal member positioned at a location within 50 mm of the first end of the extension of media;
(i) the filter cartridge having a maximum, undistorted, radial width dimension, at a location in radial overlap with the media and the housing radial seal member, of at least 10 mm less than a maximum pleat depth of the extension of media adjacent the second end of the extension of media.
7. A filter cartridge according to claim 1 including:
(a) a radially directed housing seal member at a location within 40 mm of the first end of the media.
8. A filter cartridge according to claim 7 therein:
(a) the radially directed housing seal member is positioned at a location within 15 mm of the first end of the media.
9. A filter cartridge according to claim 8 including:
(a) the housing seal member is a radially outwardly directed housing seal member.
10. A filter cartridge according to claim 1 including:
(a) a media support;
(i) the media including a non-pleated, free, tip section adjacent the media first end that extends, axially, in a direction away from the second end, an axial distance of at least 0.5 mm beyond a nearest adjacent portion of the media support.
11. A filter cartridge according to claim 1 including:
(a) a plurality of intermediate outer pleat spacers positioned between the media first and second ends;
(i) axially spaced, adjacent, ones of the plurality of intermediate outer pleat spacers having different amounts of radial projection extension toward a central axis.
12. A filter cartridge according to claim 1 including:
(a) a media support having longitudinal ribs extending along, and secured to, outer pleat tips of the media in extension from the second end of the media toward the first end of the media, along at least 50% of a length of extension of the outer pleat tips.
13. A filter cartridge according to claim 1 wherein:
(a) at the first end, the media has no pleat greater than 3 mm in depth; and,
(b) at the second end, the media comprises a plurality of pleats each having a pleat depth of at least 10 mm.
14. A filter cartridge according to claim 1 wherein:
(a) the grommet includes a central bore completely therethrough.
15. A filter cartridge according to claim 1 wherein:
(a) the central projection extends in a direction away from the first end has inner surface with a frusto-conical shape.
16. A filter cartridge according to claim 1 wherein:
(a) the outer surface of the end piece adjacent the second end of the media includes an outer receiving groove therein.
17. A filter cartridge according to claim 16 wherein:
(a) the outer receiving groove is at least 5 mm deep in axial extension from immediately adjacent portions of the end piece adjacent the second end of the media.
18. A filter cartridge according to claim 16 wherein:
(a) the outer receiving groove is at least 8 mm deep in axial extension from immediately adjacent portions of the end piece adjacent the second end of the media.
19. A filter cartridge according to claim 16 wherein:
(a) the outer receiving groove is 8-20 mm, inclusive, deep in axial extension from immediately adjacent portions of the end piece adjacent the second end of the media.
20. A filter cartridge according to claim 16 wherein:
(a) the outer receiving groove is at least 5 mm wide.
21. A filter cartridge according to claim 16 wherein:
(a) the outer receiving groove has a width of 6-30 mm, inclusive.