Air filtration arrangements having fluted media construction and methods
Filter arrangements include a barrier media in the form of fluted media treated with a deposit of fine fibers. The media is particularly advantageous in high temperature (greater than 140 to 240° F.) systems. Such systems may include engine systems, gas turbine systems, and fuel cell systems. Filter arrangements may take the form of media packs having a circular cross-section or a racetrack shaped cross-section, or media packs formed in a panel configuration.
1. A filter element arrangement comprising:
(a) a media pack having a substrate comprising first and second opposite flow faces and a plurality of flutes wherein in said media pack;
(i) each of said flutes have a first end portion adjacent to said first flow face and a second end portion adjacent to said second flow face;
(ii) selected ones of said flutes being open at said first end portion and closed at said second end portion; and selected ones of said flutes being closed at said first end portion and open at said second end portion;
(iii) said substrate at least partially covered by a layer comprising fine fiber comprising a fiber with a diameter of about 0.01 to 0.5 microns, the fiber comprising a polymer and about 2 to 25% of resinous additive in the form of a coating on the fiber such that the fiber, when tested under conditions of exposure for a test period of 16 hours to test conditions of 140° F. air at a relative humidity of 100%, retains greater than 30% of the fiber unchanged for filtration purposes; and
(b) a sealing system including a frame construction and a seal member;
(i) said frame arrangement including an extension projecting axially from one of said first and second flow faces, said extension comprises a hoop construction having an outer radial surface;
(ii) said seal member being supported by said extension of said frame arrangement;
(A) said seal member comprising a resilient seal member;
(B) said seal member being oriented against at least said outer radial surface.
2. The element of claim 1 wherein the polymer comprises an addition polymer.
3. The element of claim 2 wherein the addition polymer comprises a polyvinyl halide polymer, a polyvinylidene halide polymer or mixtures thereof.
4. The element of claim 2 wherein the addition polymer comprises a polyvinylalcohol.
5. The element of claim 2 wherein the addition polymer comprises a copolymer comprising vinylalcohol.
6. The element of claim 4 wherein the polyvinylalcohol is crosslinked with about 1 to 40 wt. % of a crosslinking agent.
7. The element of claim 5 wherein the polymer is crosslinked with about 1 to 40 wt. % of a crosslinking agent.
8. The element of claim 1 wherein the resinous additive comprises an oligomer having a molecular weight of about 500 to 3000 and an aromatic character wherein the additive is miscible in the condensation polymer.
9. The element of claim 1 comprising a condensation polymer.
10. The element of claim 9 comprising a nylon polymer.
11. The element of claim 10 wherein the nylon comprises a nylon other than a copolymer formed from a cyclic lactam and a C 6-10 diamine monomer or a C 6-10 diacid monomer.
12. The element of claim 9 wherein the condensation polymer comprises a polyalkylene terephthalate.
13. The element of claim 9 wherein the condensation polymer comprises a nylon polymer comprising a homopolymer having repeating units derived from a cyclic lactam.
14. The element of claim 10 wherein the nylon polymer is combined with a second nylon polymer, the second nylon polymer differing in molecular weight or monomer composition.
15. The element of claim 11 wherein the second nylon polymer comprises an alkoxy alkyl modified polyamide.
16. The element of claim 14 wherein the second nylon polymer comprises a nylon copolymer.
17. The element of claim 14 wherein the polymers are treated to form a single polymeric composition as measured by a differential scanning calorimeter showing a single-phase material.
18. The element of claim 17 wherein the copolymer and the second polymer are heat-treated.
19. The element of claim 18 wherein the copolymer and the second polymer are heat-treated to a temperature less than the lower melting point of the polymers.
20. The element of claim 18 wherein the additive comprises an oligomer comprising a phenol compound.
21. The element of claim 18 wherein the additive comprises a blend of the resinous additive and a fluoropolymer.
22. The element of claim 18 wherein the fluoropolymer comprises a fluorocarbon surfactant.
23. The element of claim 18 wherein the additive comprises a nonionic surfactant.
24. The element of claim 9 wherein the condensation polymer comprises a polyurethane polymer.
25. The element of claim 9 wherein the condensation polymer comprises a blend of a polyurethane polymer and a polyamide polymer.
26. The element of claim 10 wherein the nylon comprises a nylon homopolymer, a nylon copolymer or mixtures thereof.
27. The element of claim 9 wherein the condensation polymer comprises an aromatic polyamide.
28. A filter element arrangement according to claim 1 wherein said media pack and said frame construction have a circular cross-section.
29. A filter element arrangement according to claim 1 wherein said media pack and said frame construction have a racetrack shaped cross-section; and said frame construction includes radially supporting cross braces.
30. A filter element arrangement according to claim 1 further including a panel structure; said media pack being mounted within said panel structure.
31. A filter element arrangement according to claim 1 further including a sleeve member secured to and circumscribing said media pack said sleeve member being oriented relative said media pack to extend at least 30% of said axial length of said media pack; and a seal member pressure flange at least partially circumscribing said media pack said seal member pressure flange extending radially from said sleeve member and fully circumscribing said sleeve member.