High speed rotating crankcase ventilation filter media and media pack

Patent metadata

Field	Value
Publication number	US-11701606-B2
Application number	US-202117184810-A
Country	US
Kind code	B2
Filing date	Feb 25, 2021
Priority date	Aug 21, 2015
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

Abstract

Filter media and media packs that provide robust performance in high-speed rotating coalescer (HSRC) elements for crankcase ventilation systems are described. The fiber media is HSRC fiber media. As such, the filter media has a higher resistance to compressibility then traditional coalescer filter media, such as fiber media used in low-speed rotating coalescer arrangements or stationary coalescer arrangements.

First claim

What is claimed is:

1. A filter media comprising:
fibers having a geometric mean fiber diameter between 5 to 40 μm, the fibers having a solidity between 5% and 30%, and between 1% and 5% of the fibers having a diameter larger than 20 μm;
wherein the filter media has a compressibility of less than 25% at pressures greater than 20 kPa.

2. The filter media of claim 1 , wherein at least 1% to 5% of the fibers have a diameter larger than 40 μm.

3. The filter media of claim 1 , wherein about 3% of the fibers have a diameter larger than 30 μm.

4. The filter media of claim 1 , wherein the fibers are first fibers and the filter media comprises a first filter media layer comprising the first fibers, the filter media further comprising:
a second filter media layer disposed upstream or downstream of the first filter media layer, the second filter media layer comprising second fibers having a diameter greater than 30 μm.

5. The filter media of claim 1 , wherein the fibers are comprised of a polymeric material.

6. The filter media of claim 5 , wherein the polymeric material is a needle-punched polyphenylene sulfide filter media.

7. The filter media of claim 1 , wherein the filter media is formed into a cylindrical filter media pack.

8. The filter media of claim 7 , wherein the filter media has a compressibility of less than 25% at 200 G, where G is defined by the equation

G
=

ω
2

⁢
R

9
.
8

⁢
1

,

where ω is a rotational speed of the filter media pack in radians per second and R is a radius of the filter media pack in meters.

9. The filter media of claim 8 , wherein the filter media has a compressibility of less than 25% at 1000 G.

10. The filter media of claim 9 , wherein the polymer material is a single polymer material, a single copolymer material, or a single polymer blend.

11. The filter media of claim 1 , wherein the filter media has a Frazier permeability of less than or equal to 250 cubic feet per minute at 0.5 inches of water pressure drop.

12. The filter media of claim 1 , wherein the fibers are first fibers and the geometric mean fiber diameter is a first geometric mean fiber diameter, wherein the filter media further comprises second fibers having a second geometric mean fiber diameter, the second geometric mean fiber diameter different than the first geometric fiber diameter.

13. The filter media of claim 12 , wherein the second fibers are layered over the first fibers forming a multi-layer filter media.

14. The filter media of claim 12 , wherein the second fibers are positioned with respect to the first fibers such that the filter media has a varying filtering efficiency across a depth of the filter media thereby forming a gradient efficiency filter media.

15. The filter media of claim 12 , wherein the filter media is a composite filter media comprising the first fibers and the second fibers.

16. The filter media of claim 1 , wherein the compressibility is at 20 degrees Celsius.

17. The filter media of claim 1 , wherein the compressibility is at 120 degrees Celsius.

18. A filter media pack for use in a high-speed rotating coalescer, the filter media pack comprising:
filter media formed into a cylindrical filter media pack, the filter media having fibers of a polymeric material, the fibers having a geometric mean fiber diameter between 5 to 40 μm, the fibers having a solidity between 5% and 30%, and between 1% and 5% of the fibers having a diameter larger than 20 μm, the filter media has a compressibility of less than 25% at pressures greater than 20 kPa.

19. The filter media pack of claim 18 , wherein at least 1% to 5% of the fibers have a diameter larger than 40 μm.

20. The filter media pack of claim 18 , wherein about 3% of the fibers have a diameter larger than 30 μm.

21. The filter media pack of claim 18 , wherein the fibers are first fibers and the filter media comprises a first filter media layer comprising the first fibers, the filter media further comprising:
a second filter media layer disposed upstream or downstream of the first filter media layer, the second filter media layer comprising second fibers having a diameter greater than 30 μm.

22. The filter media pack of claim 18 , wherein the fibers having a Frazier permeability of less than or equal to 250 cubic feet per minute at 0.5 inches of water pressure drop.

23. The filter media pack of claim 18 , wherein the fibers are comprised of a polymeric material.

24. The filter media pack of claim 23 , wherein the polymeric material is a needle-punched polyphenylene sulfide filter media.

25. The filter media pack of claim 18 , wherein the filter media has a compressibility of less than 25% at 200 G, where G is defined by the equation

G
=

ω
2

⁢
R

9
.
8

⁢
1

,

where ω is a rotational speed of the filter media pack in radians per second and R is a radius of the filter media pack in meters.

26. The filter media pack of claim 25 , wherein the filter media has a compressibility of less than 25% at 1000 G.

27. The filter media pack of claim 18 , wherein the fibers are first fibers and the geometric mean fiber diameter is a first geometric mean fiber diameter, wherein the filter media further comprises second fibers having a second geometric mean fiber diameter, the second geometric mean fiber diameter different than the first geometric fiber diameter.

28. The filter media pack of claim 27 , wherein the second fibers are layered over the first fibers forming a multi-layer filter media.

29. The filter media pack of claim 27 , wherein the second fibers are positioned with respect to the first fibers such that the filter media has a varying filtering efficiency across a length of the filter media thereby forming a gradient efficiency filter media.

30. The filter media pack of claim 27 , wherein the filter media is a composite filter media comprising the first fibers and the second fibers.

31. A filter media comprising:
fibers having a geometric mean fiber diameter between 5 to 30 μm, the fibers having a solidity between 5% and 25%, and between 1% and 5% of the fibers having a diameter larger than 20 μm
wherein the filter media has a Frazier permeability of less than or equal to 250 cubic feet per m

Assignees

• Cummins Filtration Ip Inc

Inventors

• Schwandt Brian W
• Dawar Saru
• Holm Christopher E
• Moy Jerald J
• Verdegan Barry M

Classifications

• B01D39/1623 Primary

  of synthetic origin · CPC title

• B32B1/08

  Tubular products · CPC title

• B32B5/022

  Non-woven fabric · CPC title

• B32B5/145

  Variation across the thickness of the layer · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title