Filter Medium and Filter Element Having a Filter Medium

Patent metadata

Field	Value
Publication number	US-2016206979-A1
Application number	US-201615001542-A
Country	US
Kind code	A1
Filing date	Jan 20, 2016
Priority date	Jan 20, 2015
Publication date	Jul 21, 2016
Grant date	—

Abstract

A filter medium comprising: a first media layer; a second media layer; and at least one third media layer; wherein the second media layer is arranged downstream from the first media layer in the intended direction of flow of the filter medium; wherein the third media layer is arranged downstream from the second media layer in the intended direction of flow through the filter medium; wherein the first media layer has a degree of particle separation, which is lower than the degree of particle separation of the second media layer; wherein the second media layer has a degree of particle separation which is lower than the degree of particle separation of the third media layer; and wherein the media layers are arranged loosely and not bonded to one another, or are arranged loosely and bonded in a spot-bonded manner.

First claim

1 . A filter medium ( 1 , 11 ) comprising:
a first media layer ( 3 , 13 ); a second media layer ( 4 , 14 ); and at least one third media layer ( 5 , 15 or 16 ); wherein the second media layer ( 4 , 14 ) is arranged downstream from the first media layer ( 3 , 13 ) in the intended direction of flow ( 2 , 12 ) of the filter medium ( 1 , 11 ); wherein the third media layer ( 5 , 15 ) is arranged downstream from the second media layer ( 4 , 14 ) in the intended direction of flow ( 2 , 12 ) through the filter medium; wherein the first media layer has a degree of particle separation, which is lower than the degree of particle separation of the second media layer; wherein the second media layer has a degree of particle separation which is lower than the degree of particle separation of the third media layer; and wherein the media layers ( 3 , 4 , 5 , 13 , 14 , 15 ) are arranged loosely and not bonded to one another, or are arranged loosely and bonded in a spot-bonded manner.

2 . The filter medium according to claim 1 , wherein
the first, second and third media layers ( 3 , 4 , 5 , 13 , 14 , 15 ) consist essentially of glass fibers.

3 . The filter medium according to claim 1 , wherein
at least one of the second and/or third media layers ( 4 , 5 , 16 ) has a degree of particle separation of more than 95% for particles larger than 4 μm according to ISO 19138.

4 . The filter medium according to claim 1 , wherein
at least one of the first and/or second media layers ( 3 , 13 , 4 , 14 ) has/have a degree of particle separation of less than 90% for particles larger than 4 μm according to ISO 19138.

5 . The filter medium according to claim 1 , wherein
at least one of the at least three media layers ( 3 , 13 , 4 , 14 , 5 , 15 , 16 ) comprises at least 20 wt % glass fibers.

6 . The filter medium according to claim 5 , wherein
at least one of the at least three media layers ( 3 , 13 , 4 , 14 , 5 , 15 , 16 ) comprises at least 95 wt % glass fibers.

7 . The filter medium according to claim 1 , wherein
degrees of particle separation for particles larger than 4 μm according to ISO19138 of at least two of the media layers ( 3 , 13 , 4 , 14 , 5 , 15 , 16 ) differ from one another by at least 5%.

8 . The filter medium according to claim 1 , wherein
the first media layer ( 3 , 13 ) has a degree of particle separation of between 20% and 49%, for particles larger than 4 μm according to ISO 19138; the second media layer ( 4 , 14 , 15 ) has a degree of particle separation between 50% and 95% for particles larger than 4 μm according to ISO 19138; and the third media layer ( 5 , 16 ) has a degree of particle separation between 98% and 99.5% for particles larger than 4 μm according to ISO 19138.

9 . A filter medium ( 1 , 11 ) comprising:
a first media layer ( 3 , 13 ); a second media layer ( 4 , 14 ); and at least one third media layer ( 5 , 15 or 16 ); wherein the second media layer ( 4 , 14 ) is arranged downstream from the first media layer ( 3 , 13 ) in the intended direction of flow ( 2 , 12 ) of the filter medium ( 1 , 11 ); wherein the third media layer ( 5 , 15 ) is arranged downstream from the second media layer ( 4 , 14 ) in the intended direction of flow ( 2 , 12 ) through the filter medium; wherein the first media layer has a degree of particle separation, which is lower than the degree of particle separation of the second media layer; wherein the second media layer has a degree of particle separation which is lower than the degree of particle separation of the third media layer; and wherein the media layers ( 3 , 4 , 5 , 13 , 14 , 15 ) are not bonded to one another in a firmly bonded manner or in a spot-bonded manner. wherein the layers ( 3 , 13 , 4 , 14 , 5 , 15 , 16 ) are bonded to one another in a firmly bonded manner over less than 3% of the area content, remaining area being unbonded.

10 . The filter medium according to claim 1 , wherein
the filter medium ( 1 , 11 ) has a nanofiber layer ( 17 ) downstream from the third media layer ( 5 , 16 ) in an intended direction of flow ( 2 , 12 ) of the filter medium ( 1 , 11 ) downstream from the third media layer ( 5 , 16 ).

11 . The filter medium according to claim 10 , wherein
the nanofiber layer ( 17 ) has a degree of particle separation of more than 99.5% for particles larger than 4 μm according to ISO 19138.

12 . The filter medium according to claim 1 , wherein
the first media layer ( 3 , 13 ) at an oncoming flow side of the filter medium or at least one additional media layer is arranged on the first media layer ( 3 , 13 ); and the at least one additional media layer has a lower degree of particle separation than the first media layer ( 3 , 13 ).

13 . The filter element comprising:
a filter medium, including:
a first media layer ( 3 , 13 );
a second media layer ( 4 , 14 ); and
at least one third media layer ( 5 , 15 or 16 );
wherein the second media layer ( 4 , 14 ) is arranged downstream from the first media layer ( 3 , 13 ) in the intended direction of flow ( 2 , 12 ) of the filter medium ( 1 , 11 );
wherein the third media layer ( 5 , 15 ) is arranged downstream from the second media layer ( 4 , 14 ) in the intended direction of flow ( 2 , 12 ) through the filter medium;
wherein the first media layer has a degree of particle separation, which is lower than the degree of particle separation of the second media layer;
wherein the second media layer has a degree of particle separation which is lower than the degree of particle separation of the third media layer; and
wherein the media layers ( 3 , 4 , 5 , 13 , 14 , 15 ) are not bonded to one another, or wherein the layers ( 3 , 13 , 4 , 14 , 5 , 15 , 16 ) are bonded to one another in a firmly bonded manner over less than 3% of layer area, remaining area being unbonded;
wherein the filter medium ( 1 , 11 ) is pleated in the form of a star to form a round filter body; two end disks ( 52 , 54 ) between which the round filter body formed from the filter medium ( 1 , 11 ) is arranged.

14 . A use of the filter element ( 50 ) according to claim 13 for filtering diesel fuel in an internal combustion engine.

Assignees

• Mann & Hummel Gmbh

Inventors

• Spelter Lars
• Neubauer Sebastian
• Wagner Claudia

Classifications

• B01D29/21

  with corrugated, folded or wound sheets · CPC title

• F02M37/22

  Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system · CPC title

• B01D29/15 Primary

  arranged for inward flow filtration · CPC title

• B32B2250/03

  3 layers · CPC title

• B01D39/2017 Primary

  the material being filamentary or fibrous · CPC title