Filter device, in particular air filter

Patent metadata

Field	Value
Publication number	US-10058810-B2
Application number	US-201514819965-A
Country	US
Kind code	B2
Filing date	Aug 6, 2015
Priority date	Feb 7, 2013
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A filter device comprises an inner filter element and an outer filter element, which can be inserted into each other, wherein the outer filter element comprises a supporting frame that is the carrier of a filter medium of the filter element, and the inner filter element is supported on the supporting frame of the outer filter element.

First claim

What is claimed is:

1. A filter device, comprising:
an outer filter element having an open interior that opens to an exterior at a first axial end face; and
an inner filter element having an open interior an open interior that opens to an exterior at a first end face, the inner filter element separate from the outer filter element;
wherein the inner filter element is configured to be mountable into the open interior of the outer filter element;
wherein the inner filter element has an axial length;
wherein the inner filter element has cross-sectional shape that varies along the axial length;
wherein the outer filter element comprises
a filter medium;
a supporting frame on which the filter medium is arranged, the supporting frame carrying the filter medium;

wherein the inner filter element is supported on the supporting frame of the outer filter element;
wherein the inner filter element has a linear end face arranged axially opposite from the first end face of the inner filter element;
wherein the supporting frame of the outer filter element includes
a radially inwardly projecting protrusion formed on the support frame and projecting into the open interior of the outer filter element;
wherein the radially inwardly projecting protrusion has a U-shaped or V-shaped seat formed as an indent into an axial end of the radially inwardly projecting protrusion, the U-shaped or V-shaped seat configured to receive and support the linear end face of the inner filter element into an interior of the U-shaped or V-shaped seat;
wherein the U-shaped or V-shaped seat extends over the linear end face of the inner filter, such that:
a first side of the U-shaped or V-shaped seat contacts a first radial outer side of the inner filter element;
an opposite second side of the U-shaped or V-shaped seat contacts an opposite second radial outer side of the inner filter element.

2. The filter device according to claim 1 , wherein
the linear end face of the inner filter element is a closed end face.

3. The filter device according to claim 1 , wherein
the inner filter element has a continuously tapering cross-section along the axial length of the inner filter element.

4. The filter device according to claim 3 , wherein
the inner filter element is a wedge-shaped filter element.

5. The filter device according to claim 1 , wherein
the outer filter element has a constant cross-sectional shape across an axial length thereof.

6. The filter device according to claim 5 , wherein
the outer filter element having the constant cross-sectional shape is configured as a ring filter.

7. The filter device according to claim 1 , wherein
the outer filter element has a variable cross-sectional shape across an axial length thereof.

8. The filter device according to claim 1 , wherein
the inner filter element further comprises
a filter medium;
a supporting frame on which the inner filter element filter medium is arranged, the supporting frame carrying the filter medium.

9. A filter element for use in a filter device according to claim 1 , the filter element comprising
a filter medium;
a supporting frame arranged in an interior of the filter element, the filter medium carried on the supporting frame;
wherein the supporting frame includes
a radially inwardly projecting protrusion formed on the support frame and projecting into an open interior of the filter element;
wherein the radially inwardly projecting protrusion has a U-shaped or V-shaped seat formed as an indent into an axial end of the radially inwardly projecting protrusion, the U-shaped or V-shaped seat configured to receive and support an end face of an inner filter element receivable into the open interior.

10. An inner filter element for use in a filter device according to claims 1 ,
wherein the inner filter element has an axial length;
wherein the inner filter element has cross-sectional shape that varies along the axial length;
wherein the inner filter element has a linear end face at an axial end of the inner filter element, where radially opposite outer sides of the inner filter element join and directly contact against each other to close the linear end face;
wherein the inner filter element is configured to be mountable into an open interior of an outer filter element having:
a supporting frame that is the carrier of a filter medium of the outer filter element;
a radially inwardly projecting protrusion having a U-shaped or V-shaped seat into which the linear end face of the inner filter element is received and supported;

wherein the inner filter element if configured to be supported on the supporting frame of the outer filter element within the open interior of the outer filter element.

11. A method for replacing an outer filter element and/or an inner filter element in a filter device according to claim 1 , wherein
the filter device comprises
a housing;
an outer filter element arranged in the housing;
an inner filter element arranged in an open interior of the outer filter element, the inner filter element having a linear end face ( 16 ) at an axial end of the inner filter element;
wherein the outer and inner filter elements are embodied separately;
wherein the inner filter element is configured to be mountable into the open interior of the outer filter element;
wherein the inner filter element has an axial length;
wherein the inner filter element has cross-sectional shape that varies along the axial length;
wherein the inner filter element has a linear end face arranged axially opposite from the first end face of the inner filter element;
wherein the outer filter element includes a supporting frame that is a carrier of a filter medium of the outer filter element;
wherein the supporting frame of the outer filter element includes
a radially inwardly projecting protrusion formed on the support frame and projecting into the open interior of the outer filter element;
wherein the radially inwardly projecting protrusion has a U-shaped or V-shaped seat formed as an indent into an axial end of the radially inwardly projecting protrusion, the U-shaped or V-shaped seat configured to receive and support the linear end face of the inner filter element into an interior of the U-shaped or V-shaped seat;
wherein the U-shaped or V-shaped seat extends over the linear end face of the inner filter, such that:
a first side of the U-shaped or V-shaped seat contacts a first radial outer side of the inner filter element;
an opposite second side of the U-shaped or V-shaped seat contacts an opposite second radial outer side of the inner filter element;

the method of replacing comprising the steps of:
removing the outer filter element from the housing, which has previously been opened;
then installing the previously removed, or a new, outer filter element in the housing; and
supporting the inner filter element on the supporting frame of the outer filter element by inserting the liner end face of the inner filter element into the U-shaped or V-shaped seat of the radially inwardly projecting protrusion.

12. The method according to claim 11 , wherein
after the step of removing the outer filter element from the housing, the method further comprises:
then, removing the inner filter element from the housing;
then installing a new inner filter element in the housing.

Assignees

• Mann & Hummel Gmbh

Inventors

• Neef Pascal
• Rieger Mario

Classifications

• B01D46/0024

  Operations & Transport · mapped topic

• B01D2275/201

  Conical shape · CPC title

• B01D2265/06

  Details of supporting structures for filtering material, e.g. cores · CPC title

• B01D46/106

  Ring-shaped filtering elements · CPC title

• Y10T29/49732

  by attaching repair preform, e.g., remaking, restoring, or patching · CPC title