Air filter element and method for producing same

Patent metadata

Field	Value
Publication number	US-11517844-B2
Application number	US-201716344673-A
Country	US
Kind code	B2
Filing date	Oct 24, 2017
Priority date	Oct 24, 2016
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

The invention pertains to an air filter element comprising: a filter medium pack comprising a filter medium, said filter medium pack having an optionally substantially planar first side and an optionally substantially planar second side, said first side and second side optionally being parallel; and a guiding rim comprising a sealing surface having at least a radially oriented component, arranged on at least one of said first side and said second side, wherein a circumference of the or each guiding rim comprises at least one convex portion and at least one concave portion; and wherein a contour of said filter medium pack corresponds to said convex portion of said guiding rim and at least part of said concave portion. The invention also pertains to a method for producing an air filter element.

First claim

The invention claimed is:

1. An air filter element comprising:
a) a filter medium pack comprising a rolled-up length of a fluted filter medium arranged in a tubular shape, said filter medium pack having a substantially planar first flow side and a substantially planar second flow side, the first and second flow sides being parallel, the filter medium pack defining an outer perimeter having a convex portion and an adjacent concave portion;
b) a guiding rim formed from a first material and circumscribing a portion of the filter medium pack outer perimeter;
c) a sealing surface having at least a radially oriented component arranged on at least one of said first flow side and said second flow side, said sealing surface being configured to provide radial sealing when installed in a suitably shaped cavity; and
d) a core disposed within the filter medium such that the filter medium pack is without a hollow space at the center of the filter medium pack, the core being substantially geometrically similar to the filter medium pack outer perimeter; and
e) wherein a circumference of the guiding rim or sealing surface comprises at least one convex portion, corresponding to the filter medium pack outer perimeter convex portion, and at least one adjacent concave portion, corresponding to the filter medium pack outer perimeter concave portion.

2. The air filter element of claim 1 , wherein said outer perimeter is elongate and wherein at least one concave portion is present along a longitudinal side of said outer perimeter.

3. The air filter element of claim 2 , wherein said outer perimeter is essentially bean-shaped or kidney-shaped.

4. The air filter element of claim 1 , wherein said outer perimeter is generally 8-shaped.

5. An air filter system comprising:
a) a housing; and
b) the air filter element of claim 1 ,
c) wherein the housing defines a cavity shaped so as to be able to hold said air filter element;
d) whereby said sealing surface provides radial sealing against said housing;
e) wherein said housing comprises an access window for inserting said air filter element into said cavity and removing said air filter element from said cavity; and
f) wherein said access window is shaped and positioned in such a way that said air filter element can be inserted and removed by a movement that comprises a rotation.

6. The air filter element of claim 1 , wherein
the sealing surface is provided on a seal member supported by the guiding rim.

7. The air filter element of claim 6 , further including a second guiding rim mounted to the second flow side of the filter medium pack.

8. The air filter element of claim 6 , wherein the first guiding rim and the filter medium pack each have two convex portions and two concave portions.

9. The air filter element of claim 6 , wherein the filter medium pack has a cross-sectional shape characterized as one of a kidney-shape, a bean-shape, an 8-shape, an S-shape, and a W-shape.

10. The air filter element of claim 1 , wherein the sealing surface is provided on a sealing member supported by the guiding rim, wherein the sealing member and the guiding rim are separately formed components, wherein both the sealing member and the guiding rim are substantially geometrically similar to the filter medium pack outer perimeter.

11. The air filter element of claim 10 , wherein the guiding rim is formed from a first material and the sealing member is formed from a second material different from the first material.

12. The air filter element of claim 11 , wherein the guiding rim is a rigid plastic material and the second material is an elastomer or polyurethane material.

13. The air filter element of claim 10 , wherein the guiding rim includes a first extension circumscribing the filter medium pack outer perimeter.

14. The air filter element of claim 10 , wherein a central grid portion of the guiding rim is substantially geometrically similar to the filter medium pack outer perimeter convex and concave portions.

15. An air filter element comprising:
a) a filter medium pack comprising a rolled-up length of a fluted filter medium arranged in a tubular shape, said filter medium pack having a substantially planar first flow side and a substantially planar second flow side parallel to the first flow side, the filter medium pack defining an outer perimeter having a convex portion and an adjacent concave portion;
b) a core disposed within the filter medium pack such that the air filter element is without a hollow space at the center of the filter medium pack, the core being substantially geometrically similar to the filter medium pack outer perimeter convex and concave portions;
c) a guiding rim formed from a first material, the guiding rim having a grid structure supporting the filter medium pack first flow side and a first end of the core, the guiding rim having oppositely extending first and second axial extensions, wherein each of the guiding rim first axial extension, the guiding rim second axial extension, and a central portion of the grid structure are substantially geometrically similar to the filter medium pack outer perimeter convex and concave portions, the first axial extension circumscribing the filter medium pack outer perimeter convex and concave portions, the second axial extension extending beyond the filter medium pack first flow side and being radially inset from the filter medium pack outer perimeter; and
d) a seal member formed from a second material different from the first material, the seal member being secured to the guiding rim second axial extension, the seal member being substantially geometrically similar to the filter medium pack outer perimeter convex and concave portions.

Assignees

• Donaldson Co Inc

Inventors

• Decoster Kristof
• Craessaerts Johnny

Classifications

• B01D46/527 Primary

  in wound arrangement · CPC title

• B01D46/0001

  Making filtering elements · CPC title

• B01D2271/027

  Radial sealings · CPC title

• B01D2275/206

  Special forms, e.g. adapted to a certain housing · CPC title

• B01D46/52

  Particle separators, e.g. dust precipitators, using filters embodying folded {corrugated or wound sheet} material · CPC title