Filter system with filter element

Patent metadata

Field	Value
Publication number	US-9457307-B2
Application number	US-201414474227-A
Country	US
Kind code	B2
Filing date	Sep 1, 2014
Priority date	Sep 2, 2013
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A filter system is provided with a housing having a housing wall and a cover, the housing having a longitudinal axis. An inlet is arranged on the housing and feeds a fluid to be filtered into the housing. An outlet is arranged on the housing and discharges the filtered fluid. Filter elements each having at least one filter medium are arranged in the housing. At least one of the filter elements extends along the longitudinal axis. The filter medium has pleats extending along the longitudinal axis with outer and inner pleat edges. The outer pleat edges extend on the first side of the filter medium and the inner pleat edges on the second side of the filter medium and are opposite the outer pleat edges. The filter medium has a variable flow resistance along the longitudinal axis.

First claim

What is claimed is:

1. A filter system comprising:
a housing with a housing wall and a cover;
an inlet arranged on the housing and adapted to feed a fluid to be filtered into the housing;
an outlet arranged on the housing and adapted to discharge the filtered fluid;
one or more filter elements arranged in the housing, wherein the filter elements each comprise at least one filter medium, wherein at least one of the filter elements extends along a longitudinal axis;
wherein the filter medium is pleated in a zigzag shape and has a first side and a second side opposite the first side,
wherein the filter medium comprises pleats extending in a direction of the longitudinal axis,
wherein the pleats comprise outer pleat edges and inner pleat edges,
wherein the outer pleat edges are positioned on the first side of the filter medium and
wherein the inner pleat edges are positioned on the second side of the filter medium and are positioned opposite the outer pleat edges;
wherein the filter medium has a variable flow resistance along the longitudinal axis,
wherein a first one and a second one of the filter elements are provided and wherein said first one of the filter elements is arranged in an interior of said second one of the filter elements.

2. The filter system as claimed in claim 1 , wherein
the outer pleat edges are positioned on an envelope surface of a cylinder and the inner pleat edges are positioned at least partially on an envelope surface of a cone.

3. The filter system as claimed in claim 1 , wherein
the outer pleat edges are positioned at least partially on an envelope surface of a cone and the inner pleat edges are positioned on an envelope surface of a cylinder.

4. The filter system as claimed in claim 1 , wherein
the outer pleat edges and the inner pleat edges are positioned at least partially on an envelope surface of a cone.

5. The filter system as claimed in claim 1 , wherein
a pleat height of the pleats changes continuously along the longitudinal axis.

6. The filter system as claimed in claim 1 , wherein
the inner or outer pleat edges of said first filter element are positioned on an envelope surface of a first cone and
wherein the inner or outer pleat edges of said second filter element are positioned on an envelope surface of a second cone,
wherein the first and second cones are oriented in the same direction along the longitudinal axis.

7. The filter system as claimed in claim 1 , wherein
the inner or outer pleat edges of said first filter element are positioned on an envelope surface of a first cone and
wherein the inner or outer pleat edges of said second filter element are positioned on an envelope surface of a second cone,
wherein the first and second cones are oriented in opposite directions along the longitudinal axis.

8. The filter system as claimed in claim 1 , wherein
said first one of the filter elements is arranged as a secondary element in the interior of said second one of the filter element.

9. The filter system as claimed in claim 8 , comprising
a supporting tube arranged in the interior of the secondary element.

10. The filter system as claimed in claim 8 , wherein
the filter medium of the secondary element is comprised of a fleece.

11. The filter system as claimed in claim 8 , wherein
the secondary element is connected to the housing and remains in the housing when changing the filter element.

12. The filter system as claimed in claim 1 , wherein
at least one of the filter elements is arranged in the housing so as to be replaceable.

13. The filter system as claimed in claim 1 embodied as an air filter.

14. The filter system as claimed in claim 1 embodied as an air filter of an internal combustion engine.

15. The filter system as claimed in claim 1 embodied as a particle filter.

16. The filter system as claimed in claim 1 embodied as a particle filter of an internal combustion engine.

17. A filter system, comprising:
a first stage filter element and a second stage filter element, the first and the second stage filter elements each comprising:
a filter medium;
wherein the filter medium is folded in a zigzag shape into a plurality of pleats, each filter medium pleat having an inner pleat edge and an outer pleat edge, wherein the pleat edges extend in a longitudinal direction;
wherein a pleat height is a radial distance from the inner pleat edge to the outer pleat edge of a respective filter medium pleat;

wherein the filter medium pleat has a pleat height that varies across the filter medium from a first longitudinal end of the filter medium to a second longitudinal end of the filter medium;
wherein the pleat height is greater at the first longitudinal end of the filter medium than at the second longitudinal end of the filter medium;
wherein either one of the inner pleat edges or the outer pleat edges are arranged on an envelope surface of a cone encircling the longitudinal axis such that the filter medium has semi-conical pleating;
wherein the outer pleat edges are positioned on the first side of the filter medium, and
wherein the inner pleat edges are positioned on the second side of the filter medium and are positioned opposite the outer pleat edges; and
wherein the filter medium has a variable flow resistance along the longitudinal axis provided by the varying pleat height;

wherein the first stage filter element encircles and is circumferentially closed about an exterior of the second stage filter such that the first stage filter element is connected to the second stage filter element;
wherein the first stage filter element has a first facing envelope surface of the inner pleat edges having a surface configuration that is either conical or cylindrical; and
wherein the envelope surface of the outer pleat edges of the second stage filter element has: a second surface configuration that is conical if the first surface configuration is conical, or cylindrical if the first surface configuration is cylindrical.

18. The filter system as claimed in claim 17 , wherein
the filter medium is annularly closed.

19. The filter system as claimed in claim 17 , wherein
the filter medium is comprised of paper or of cellulose or of a mixed fiber made of plastic and cellulose.

Assignees

• Mann & Hummel Gmbh

Inventors

• Kaufmann Michael
• Ruhland Klaus-Dieter
• Marton Imre

Classifications

• B01D46/521 Primary

  using folded, pleated material · CPC title

• B01D46/0046

  provoking a tangential stream (B01D46/0045 takes precedence) · CPC title

• F02M35/024

  using filters, e.g. moistened (F02M35/026 takes precedence; cleaning of the filtering material F02M35/08) · CPC title

• B01D46/0002

  Casings; Housings; Frame constructions · CPC title

• B01D46/0001

  Making filtering elements · CPC title