# US 2023/0264129 A1 · Filter element with an annular seal having a positioning and sealing section with concentric annular seal rings forming a sealing groove

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- Number: US 2023/0264129 A1
- Document ID: US20230264129A1
- Status: Published application
- Kind: A1
- Application number: 17/679,299
- Filed: 2022-02-24
- Published: 2023-08-24
- Earliest claimed: 2022-02-24
- Assignees: Mann+Hummel GmbH
- Applicants: MANN+HUMMEL GmbH
- Inventors: Bruno César Proença Ribeiro; Fabio Faria de Souza; Francisco José da Silva Henriques
- Web page: https://patentgrep.com/patent/US20230264129A1

## CPC

- B01D 29/21: with corrugated, folded or wound sheets
- B01D 46/2411: {Filter cartridges}
- B01D 35/147: Bypass or safety valves
- B01D 35/16: Cleaning-out devices {, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid}
- B01D 46/0005: {Mounting of filtering elements within casings, housings or frames (B01D46/2422 takes precedence)}
- B01D 46/2414: {End caps including additional functions or special forms}
- B01D 46/521: {using folded, pleated material}
- B01D 2201/0415: Details of supporting structures
- B01D 2201/295: with projections extending in a radial outward direction, e.g. for use as a guide, spacing means
- B01D 2201/305: Snap, latch or clip connecting means
- B01D 2201/34: Seals or gaskets for filtering elements
- B01D 2265/026: with means for avoiding false mounting
- B01D 2265/06: Details of supporting structures for filtering material, e.g. cores
- B01D 2271/02: Gaskets, sealings
- B01D 2271/022: Axial sealings
- B01D 2271/027: Radial sealings
- B01D 2275/203: Shapes flexible in their geometry, e.g. bendable, adjustable to a certain size
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

A filter element for exchangeable installation into a filter housing has an annular filter medium with an annular seal secured directly or indirectly onto the first axial end. The annular seal having a positioning and sealing section and concentric annular sealing rings between which a sealing groove is formed. A radially outer side of the radially outer annular ring having a key locking system formed by a plurality of circumferentially spaced apart radial projections, spaced apart by radial indentations, adapted to positively engage cooperative configured geometries or key locking features of a filter housing when in an installed state, thereby locking a rotational orientation and position of the filter element.

## Claims

### Claim 1

A filter element for exchangeable installation in a filter housing, the filter element comprising:
an annular filter medium arranged in a tubular concentric shape surrounding a central axis, the annular filter medium having:
a first axial end;
a second axial end arranged opposite the first axial end;
wherein the annular filter medium is zig-zag folded into a plurality of filter medium pleats extending from the first axial end to the second axial end;
an annular seal secured directly or indirectly onto the first axial end of the filter medium and surrounding an central opening extending through the annular seal and into an interior of the annular filter medium, the annular seal having:
an annular base portion shaped as an end disc, radially extending and covering the first axial end of the filter medium;
a positioning and sealing section of the annular seal comprising:
a radially inner ring portion, formed on an axially outer face of the annular base portion, surrounding the central opening and projecting axially outwardly away from the annular base portion to a first free axial end face of the radially inner ring portion;
a radially outer annular ring portion, formed on the axially outer face of the annular base portion, spaced radially outwardly away from radially inner ring portion, surrounding the central opening and projecting axially outwardly away from the annular base portion to a second free axial end face of the radially outer annular ring portion;
a positioning device formed on a radially outer side of the radially outer annular ring portion, comprising:
positioning projections which are circumferentially spaced apart on a radially outer side of the radially outer annular ring portion;
positioning recesses or indentations formed into and circumferentially spaced apart on the radial outer side of the radially outer annular ring portion of the annular seal;
wherein adjacent ones of the positioning projections are spaced apart by a respective positioning recess or indentation;
wherein the positioning projections and positioning recesses or indentations are adapted to positively engage cooperative configured geometries or key locking features of a filter housing when in an installed state, thereby locking a rotational orientation and establishing axial position of the filter element in the filter housing;
wherein the positioning recesses or indentations extend axially from the second free axial end face towards the annular base portion of the annular seal;
the positioning and sealing section of the annular seal further including:
an annular sealing groove formed in the radial spacing between the radially outer annular ring portion and the radially inner ring portion, the annular sealing groove configured to receive and seal against an annular projection of the filter housing, when in the installed state;
wherein the first free axial free end face extends axially outward from the annular base portion by a first projection distance d1;
wherein the second free axial end face extends axially outward from the radially extending annular base portion by a second projection distance d2;
wherein d1>d2, such that the first free axial end face is recessed axially from the second free axial end face.

### Claim 2 (depends on 1)

The filter element according to claim 1, wherein
the annular seal is unitary, formed in one piece of polyurethane, polyurethane foam or another elastomer.

### Claim 3 (depends on 1)

The filter element according to claim 1, wherein
the positioning recesses or indentations are uniformly spaced apart from each other on the radially outer side of the radially outer annular ring portion.

### Claim 4 (depends on 1)

The filter element according to claim 1, wherein
the positioning recesses or indentations have an arcuate back face substantially the shape of a cylinder section having an indentation radius relative R1 to the central axis (14) of the filter element.

### Claim 5 (depends on 1)

The filter element according to claim 1, wherein
the positioning projections have a radially outer face having substantially the shape of a cone section, the radially outer face having a projecting radius R2 relative to the central axis of the filter element at the second free end face;
wherein the radially outer face of the positioning projections slants radially inwardly relative to the central axis when traversed in an axial direction from the annular base portion to the second free axial end face.

### Claim 6 (depends on 1)

The filter element according to claim 1, wherein
the annular base portion has an annular lip which projects axially inwardly over a radially outer flow face of the annular filter medium;
wherein the annular lip includes a plurality of radial lip indentations circumferentially spaced apart from each other;
wherein the radial lip indentations are spaced radially outwardly from the plurality of circumferentially spaced apart radial projections (38) of the radially outer annular ring portion of the annular seal.

### Claim 7 (depends on 1)

The filter element according to claim 1, wherein
the positioning recesses or indentations extend axially from the second free axial end face to the annular base portion of the annular seal.

### Claim 8 (depends on 1)

The filter element according to claim 1, wherein
d1>d2, such that the first free axial end face is recessed axially from the second free axial end face by an axial distance of 1 to 5 mm.

### Claim 9 (depends on 8)

The filter element according to claim 8, wherein
d1>d2, such that the first free axial end face is recessed axially from the second free axial end face by an axial distance of 2 to 3 mm.