Air cleaner; replaceable filter cartridges; and, methods
The disclosure concern air cleaners. Preferred air cleaners are shown which include a housing and a removable and replacement primary filter cartridge. Optional and advantageous features are shown. An optional mechanical interlock, operated with a non-threaded, movement of the cartridge, is provided between the primary filter cartridge and the housing. The preferred primary filter cartridge is conical in shape. A preferred optional safety or secondary filter cartridge is shown. Preferred methods of assembly and use are provided.
1. An air filter cartridge installable in use in an air cleaner housing having an access cover; the filter cartridge comprising:
(a) first and second, opposite, end caps:
(i) the first end cap having an air flow exit aperture therethrough; and,
(ii) the second end cap being closed;
(b) pleated filter media extending between the first and second end caps and surrounding and defining an open filter interior;
(c) the first end cap including a seal member molded-in-place as a portion of the first end cap; and,
(d) the second end cap including a first receiver of a projection/receiver arrangement thereon positioned centrally on the second end cap and projecting into the open filter interior; the receiver surrounding a space defining an open receiver center facing a direction away from the first end cap and having a non-circular shape in cross-section in a plane perpendicular to the open filter interior and a direction between the first end cap and the second end cap.
2. An air filter cartridge according to claim 1 wherein:
(a) the non-circular shape comprises a plurality of evenly radially spaced features configured for rotational interference with an air cleaner housing cover.
3. An air cleaner cartridge according to claim 2 wherein:
(a) the open receiver center comprising a non-circularly shaped central recess in the second end cap.
4. An air cleaner cartridge according to claim 3 wherein:
(a) the non-circularly shaped central recess comprises a plurality of alternating convex and concave features.
5. An air filter cartridge according to claim 3 wherein:
(a) the open receiver center has four-fold housing rotational symmetry.
6. An air filter cartridge according to claim 3 wherein:
(a) the first end cap has a first outer diameter and the second end cap has a second outer diameter; the first end cap having a larger outer diameter than the second end cap.
7. An air filter cartridge according to claim 6 wherein:
(a) the filter media defines a conical extension between the first and second end caps with a larger outer dimension adjacent the first end.
8. An air filter cartridge according to claim 1 including:
(a) outer framework having a sidewall structure circumscribing the media at least at a location adjacent the first end and having an outer surface; the outer framework including an air impermeable portion in the sidewall structure of the outer framework, and having a conical shaped portion with a portion adjacent the first end having an outer diameter D 1 and a portion adjacent the second end having an outer diameter D 2 , wherein D 1 >D 2 .
9. An air filter cartridge according to claim 1 including:
(a) an outer framework having a sidewall structure circumscribing the media at least at a location adjacent the first end cap;
(i) the outer framework including an imperforate shield section adjacent the first end cap and extending an axial distance of at least 10% and not more than 40% of a distance between the first end cap and the second end cap; and
(ii) the outer framework including a dust shield positioned and oriented as a circular, radially outwardly projecting, ring.
10. An air filter cartridge according to claim 1 including:
(a) a preform liner extending completely from the first end cap to the second end cap.
11. An air filter cartridge according to claim 10 wherein:
(a) the preform liner is an outer liner.
12. An air filter cartridge according to claim 1 wherein:
(a) the non-circular shape comprises evenly spaced features, around a central axis, configured for engagement with an air cleaner housing.
13. An air cleaner cartridge according to claim 10 wherein:
(a) the non-circularly shaped central recess comprises a plurality of alternating convex and concave features.
14. An air filter cartridge according to claim 13 wherein:
(a) the first end cap has a first outer diameter and the second end cap has a second outer diameter; the first end cap having a larger outer diameter than the second end cap.
15. An air filter cartridge according to claim 14 wherein:
(a) the seal member comprises a part of a molded-in-place portion of the first end cap.
16. An air filter cartridge according to claim 14 including:
(a) a preform liner extending completely from the first end cap to the second end cap.
17. An air filter cartridge according to claim 16 wherein:
(a) the preform liner is an outer liner.
18. An air cleaner assembly comprising:
(a) a housing having: an air inlet; an air outlet; and, a dust ejector;
(i) the housing defining an interior and having a sidewall and removable access cover;
(ii) the sidewall being a segmented sidewall comprising first and second sections joined at a joint by an interlock mechanism comprising a plurality of projections and a plurality of receivers;
(b) a member of a projection/receiver arrangement positioned in the housing;
(i) the member of the projection/receiver arrangement comprising a projection positioned in the housing comprising a projection having a non-circular cross-section;
(c) an air filter cartridge removably positioned within the housing interior; the air filter cartridge comprising:
(i) first and second, opposite, ends;
(A) the first end having an air flow exit aperture therethrough;
(B) filter media extending between the first and second ends and surrounding an open filter interior;
(d) a first end cap at the first end of the filter cartridge;
(i) the first end cap including a seal member thereon;
(e) a second end cap at the second end of the filter cartridge and including a central recess therein positioned centrally on the second end cap and having a non-circular shape in cross-section in a plane perpendicular to direction between the first end cap and the second end cap;
(A) the central recess being surrounded by the media; and,
(f) the air filter cartridge being positioned with the projection on the housing projecting into the recess on the filter cartridge and with the seal member on the first end cap releasably sealed to the housing.
19. An air cleaner assembly according to claim 18 wherein:
(a) the inlet is configured to direct inlet air flow tangentially around the cartridge.
20. An air cleaner assembly according to claim 19 wherein:
(a) the air flow inlet is positioned in the second section of the sidewall; the second section of the sidewall being positioned between the access cover and the first section of the sidewall.
21. An air cleaner assembly according to claim 18 wherein:
(a) the filter media is pleated.
22. An air cleaner assembly according to claim 18 wherein:
(a) the media is positioned to slant away from the inlet in extension from the first end to the second end.
23. An air cleaner assembly according to claim 18 wherein:
(a) the seal member comprises a molded-in-place portion of the first end cap.