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. 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 comprising:
(a) first and second, opposite, ends;
(i) the first end having an air flow exit aperture therethrough;
(b) a conical extension of filter media extending between the first and second ends and around a central cartridge axis;
(c) a first, open, end cap adjacent the first end of the filter cartridge;
(i) the media being embedded in the first, open, end cap;
(d) a housing seal including a seal surface directed radially with respect to the cartridge central axis, to form a removable seal with a portion of an air cleaner, in use; and,
(e) a second, closed, end cap adjacent the second end of the filter cartridge;
(i) the second end cap including a central projection extending inwardly of the filter cartridge a distance of at least 15 mm; and,
(ii) the central projection including an inner recess open toward the first end cap and extending in an axial direction away from the first end cap.
2. An air filter cartridge according to claim 1 wherein:
(a) the housing seal includes a seal surface directed radially outwardly with respect to the cartridge central axis.
3. An air filter cartridge according to claim 2 wherein:
(a) the housing seal is integral with a molded-in-place portion of the first, open, end cap.
4. An air filter cartridge according to claim 1 wherein:
(a) the housing seal is integral with a molded-in-place portion of the first, open, end cap.
5. An air filter cartridge according to claim 4 including:
(a) an liner extending between the first and second end caps.
6. An air filter cartridge according to claim 5 wherein:
(a) the liner comprises an inner liner.
7. An air filter cartridge according to claim 5 wherein:
(a) the liner comprises an outer liner.
8. An air filter cartridge according to claim 1 wherein:
(a) the media has a conical angle of at least 1°.
9. An air filter cartridge according to claim 1 wherein:
(a) the media has a conical angle within the range of 1°-4°.
10. An air filter cartridge according to claim 1 wherein:
(a) the second, closed, end cap includes a preform including:
(i) a central, imperforate, end region; and,
(ii) an outer perforate region embedded in, and closed by, a molded-in-place portion of the second end cap.
11. An air filter cartridge according to claim 10 wherein:
(a) the outer perforate region extends across an end of the media.
12. An air filter cartridge according to claim 10 wherein:
(a) the housing seal includes a seal surface directed radially outwardly with respect to the cartridge central axis.
13. An air filter cartridge according to claim 12 wherein:
(a) the housing seal is integral with a molded-in-place portion of the first, open, end cap.
14. An air filter cartridge according to claim 10 wherein:
(a) the housing seal is integral with a molded-in-place portion of the first, open, end cap.
15. An air filter cartridge according to claim 10 including:
(a) a liner extending between the first and second end caps.
16. An air filter cartridge according to claim 15 wherein:
(a) the liner comprises an inner liner.
17. An air filter cartridge according to claim 15 wherein:
(a) the liner comprises an outer liner.
18. An air filter cartridge according to claim 1 wherein:
(a) the housing seal is positioned in extension around an end of the media.
19. An air filter cartridge according to claim 1 including:
(a) a preform embedded in the first end cap and including a radial ring extending away from the cartridge central axis to a location further radially outwardly than any portion of the first end cap in which the media is embedded.
20. An air filter cartridge according to claim 1 wherein:
(a) the media is pleated.