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1. WO2021061521 - STAR PLEATING WITH INSIDE OUT FLOW HAVING WATER DRAINAGE THROUGH THE CENTER

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[ EN ]

WHAT IS CLAIMED IS:

1. A filter cartridge, comprising:

a cup-shaped housing with an open end;

an annular filter element supported in the housing and defining an annular peripheral region between an outer periphery of the filter element and a side wall of the housing, and a lower water collection region between a lower end of the filter element and a lower wall of the housing, the filter element including pleated media surrounding an axially-extending central area, with the media having pleats of different radial heights arranged circumferentially around the central area;

an annular end plate sealingly bonded to an upper end of the filter element and preventing fluid flow through axial upper ends of the pleats, with a first passage defined through a central opening of the end plate into the central area, and a second passage defined between or through the end plate, and the peripheral region;

the filter element having freely supported axially lower ends; and

a seal between the axial lower periphery of the filter element, and the housing, preventing fluid bypass of the filter element;

wherein a flow path is defined between the first and second passages, where the fluid passes radially through the pleats, and water in the fluid can coalesce on the media and drain down into the collection region.

2. The filter cartridge as in claim 1, wherein the pleats include radially full, mid and short pleats in a repeating arrangement around the core.

3. The filter cartridge as in claim 1, wherein the filter element does not include a center tube.

4. The filter cartridge of claim 1, wherein each of the pleats includes a plurality of embossments configured to add structural strength to the pleats.

5. The filter cartridge of claim 1, wherein the annular end plate is sealingly bonded to the upper end of the filter element using adhesive.

6. The filter cartridge of claim 1, wherein the annular end plate has no contact with the cup-shaped housing.

7. The filter cartridge of claim 1, wherein an interior wall of the housing includes a ledge, wherein the axially lower end of the filter element is sealingly attached to the ledge.

8. The filter cartridge of claim 7, wherein the ledge extends radially inward from the lower wall no more than 0.75 inches.

9. A filter cartridge, comprising:

a cylindrical housing with an open end and a partially open end opposite the open end;

a water bowl attached to the partially open end;

an annular filter element disposed within the housing and defining an annular peripheral region between a perimeter of the annular filter element and a side wall of the cylindrical housing, the filter element including pleated media surrounding an axially-extending central area, the media having pleats of different radial heights arranged circumferentially around the central area, wherein the annular filter element is sealingly attached to the cylindrical housing at the partially open end;

a solid annular end plate sealingly attached to a first end of the annular filter element, wherein a first passage is defined by a central opening of the annular end plate and by the central area, and a second passage defined by a space between the cylindrical housing and both the annular end plate and annular peripheral region, and wherein a fluid flow path is defined between the first and second passages in which fluid passes radially through the pleats such that water in the fluid coalesces on the media and drain down into the water bowl; and

wherein the annular filter element further includes a seal on a second end opposite the first end, the seal configured such that fluid flowing along the fluid flow path cannot bypass the annular filter element.

10. The filter cartridge of claim 9, wherein the pleats include radially full, mid and short pleats in a repeating arrangement around the core.

11. The filter cartridge of claim 9, wherein the annular filter element does not include a center tube.

12. The filter cartridge of claim 9, wherein the partially open end of the cylindrical housing includes an annular end wall attached to, and perpendicular to, a side wall of the housing, such that the annular end wall abuts and supports a perimeter portion of the annular filter element.

13. The filter cartridge of claim 12, wherein the annular filter element is sealingly attached to the annular end wall of the cylindrical housing where the annular filter element abuts the annular end wall.

14. The filter cartridge of claim 13, wherein a perimeter portion of the annular filter element, ranging from 0.25 to 0.50 of an inch, is sealingly attached to the annular end wall.

15. The filter cartridge of claim 12, wherein the annular end wall extends radially inward from the side wall no more than 0.75 inches.

16. The filter cartridge of claim 9, wherein the annular filter element is sealingly attached at the partially open end of the cylindrical housing using adhesive.

17. The filter cartridge of claim 9, wherein each of the pleats includes a plurality of embossments configured to add structural strength to the pleats.

18. The filter cartridge of claim 9, wherein the annular end plate is sealingly attached to the first end of the annular filter element using adhesive.

19. The filter cartridge of claim 9, wherein the annular end plate has no contact with the cylindrical housing.

20. The filter cartridge of claim 9, wherein the annular end plate is impermeable.

21. The filter cartridge of claim 9, wherein the water bowl is transparent.