WO2022117707A1 - Filterelement und filtereinrichtung - Google Patents
Filterelement und filtereinrichtung Download PDFInfo
- Publication number
- WO2022117707A1 WO2022117707A1 PCT/EP2021/083921 EP2021083921W WO2022117707A1 WO 2022117707 A1 WO2022117707 A1 WO 2022117707A1 EP 2021083921 W EP2021083921 W EP 2021083921W WO 2022117707 A1 WO2022117707 A1 WO 2022117707A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fold
- folds
- height
- filter
- filter element
- Prior art date
Links
- 230000007423 decrease Effects 0.000 claims abstract description 33
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 239000011295 pitch Substances 0.000 description 18
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
- B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
- B01D46/522—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with specific folds, e.g. having different lengths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2275/20—Shape of filtering material
- B01D2275/206—Special forms, e.g. adapted to a certain housing
Definitions
- the invention relates to a filter element with a filter medium which has a multiplicity of successive folds in a longitudinal direction from a first transverse side to a second transverse side.
- US Pat. No. 5,897,776 A discloses an air filter with a filter medium, the filter medium having a larger filter surface in a central area than in an edge area. In one embodiment, more folds can be arranged in the central area than in the edge area.
- a similar filter element is known from JPH1176729A.
- a second embodiment of the air filter from US Pat. No. 5,897,776 A provides that a fold height is greater in the central area than in the edge area.
- An internal pressure filter with a circular filter element made of folded filter paper is known from CN 201752600 U. Successive pleats of the filter element have repeatedly increasing and decreasing heights and spacing.
- a filter element with a filter medium has a multiplicity of successive folds in a longitudinal direction.
- the longitudinal direction runs from a first to a second transverse side of the filter element.
- the folds are delimited on the one hand by first fold edges and on the other hand by second fold edges.
- a fold is understood to mean in particular a V-shaped section of the filter medium. A fold can therefore extend from a first folded edge via a second folded edge to a further first folded edge.
- a fold can extend from a second folded edge via a first folded edge to a further second folded edge.
- the fold edges basically run transversely, preferably perpendicularly, to the longitudinal direction.
- the folded edges can run parallel to the transverse sides.
- the filter element can have a frame on the two transverse sides and on the longitudinal sides.
- the filter medium can be embedded in the frame.
- the frame can seal open end faces of the folds.
- the filter element can be an air filter element.
- a height of the folds decreases continuously in the longitudinal direction.
- the height of the folds describes in particular a distance between the first and the second fold edges of the respective folds.
- the height of the folds can be measured perpendicular to the longitudinal direction.
- the height of a fold can be determined as an average of the distance between the first or second fold edge, which delimits the fold on one side, and the two second or first fold edges, which delimit the fold on the other side.
- a continuous decrease in the height of the folds is understood to mean in particular that no fold further forward in the longitudinal direction (closer to the second transverse side) is higher than a fold further back in the longitudinal direction (closer to the first transverse side). It should be noted that areas with equal height folds can exist.
- the consistent decrease in the height of the pleats further assumes that for every pleat, except for a group of longitudinally last pleats, there exists a longitudinally more advanced pleat of lesser height.
- the group of longitudinally last folds may comprise a single fold or multiple folds.
- the height of a fold forward in the longitudinal direction is at most as large as the height of each of the folds backward in the longitudinal direction. Longitudinally furthest folds have the greatest height; pleats furthest forward in the longitudinal direction have the smallest height. The smallest height is smaller than the largest height.
- the width of the folds can also be referred to as the fold pitch.
- the width of the folds or the division of the folds can be measured between the first and second fold edges, at which directly consecutive folds adjoin one another.
- a depth of the filter element, measured parallel to the fold edges, can be constant or variable.
- the filter element Due to the variable height of the folds, the filter element can also be used in installation spaces with complex shapes and the available installation space can be used to the maximum.
- an advantageous ratio of their dimensions to one another can be selected for each fold. This can improve the flow through a filter device with the filter element. Particularly in the case of high fold heights and filter media with low permeability, a pressure loss across the filter element can be reduced by the configuration of the filter element according to the invention.
- the dust absorption capacity of the filter element can be increased by the design according to the invention.
- the fold heights and fold pitches of the filter element are coordinated with one another depending on the degree of separation determined by the medium used, the filtration conditions, e.g. Particularly good results in terms of dust absorption capacity and pressure loss for use in an air filter for filtering the intake air of a combustion engine or cathode air of a fuel cell can be achieved if the filter element has the following parameters:
- the fold pitch is 3.7 to 6.0 mm; with a fold height of 275 to 400 mm, the fold pitch is 3.3 to 4.5 mm; with a fold height of 175 to 275 mm the fold pitch is 3.0 to 3.7 mm and with a fold height of 75 to 175 mm the fold pitch is 2.5 to 3.3 mm.
- cabin filters in particular building ventilation filters, or gas turbine filters:
- the fold spacing is 5.0 to 10.0 mm; with a fold height of 275 to 400 mm, the fold pitch is 4.0 to 8.0 mm; with a fold height of 175 to 275 mm the fold pitch is 4.0 to 6.0 mm and with a fold height of 75 to 175 mm the fold pitch is 3.5 to 5.0 mm.
- the width of the folds decreases in segments in the longitudinal direction.
- the width of the folds in other words the pitch of the folds, is the same in several segments of the filter element.
- the width of the folds decreases.
- the width of the folds thus describes a step-like progression.
- Such a filter element can be manufactured efficiently.
- the filter element has three or four segments with different pitches of folds.
- the filter element has a steadily decreasing fold height with values from a range between 500 mm and 75 mm and has three or four segments within which the fold pitch is the same and is selected from the above intervals in such a way that the fold pitch decreases in the longitudinal direction .
- the width of the folds in the longitudinal direction can steadily decrease, at least in certain areas. It can be provided that in individual segments along the longitudinal direction the folds are formed with the same width within the respective segment. In the other areas, the width of the folds then steadily decreases. However, the width of the folds preferably increases continuously from the first transverse side steadily down to the second transverse side. A continuous assumption is understood to mean that the width of a longitudinally forward fold (closer to the second transverse side) is smaller than the width of the longitudinally immediately behind (closer to the first transverse side) fold.
- the height of the folds may decrease in segments.
- the height of the folds is the same in several segments of the filter element. In the sequence of segments along the longitudinal axis, the height of the folds decreases.
- the height of the folds thus describes a step-like progression over the longitudinal direction.
- the segments of folds of the same height can coincide with segments of folds of the same width.
- the height of the folds in the longitudinal direction can steadily decrease, at least in certain areas. It can be provided that in individual segments along the longitudinal direction the folds are formed with the same height within the respective segment. In the other areas, the height of the folds then steadily decreases. However, the height of the folds preferably decreases continuously from the first transverse side to the second transverse side. A steady decrease is understood to mean that the height of a fold further forward in the longitudinal direction (closer to the second transverse side) is smaller than the height of the fold immediately behind it in the longitudinal direction (closer to the first transverse side).
- the width and the height of the folds are each in a constant ratio to one another.
- the quotient of its height and its width is the same for each of the folds.
- the ratios can be considered to be the same.
- First folded edges of the folds can extend in a common first plane. All first folded edges of the filter element preferably extend in the first plane. This can simplify manufacture and handling of the filter element. Furthermore, second fold edges of the folds can extend in a second plane. All second folded edges of the filter element preferably extend in the second plane. The first and second planes are inclined towards each other, so that the height of the folds decreases in the longitudinal direction.
- First and/or second folded edges of the folds can run parallel to one another. This simplifies production. All of the first and second fold edges preferably run parallel to one another.
- the filter medium is advantageously based on cellulose.
- the filter medium consists of cellulose fibers reinforced with synthetic resin.
- the material thickness of the filter medium is preferably between 0.25 and 1.5 mm.
- the permeability according to DIN EN ISO 9237 of the filter medium is preferably between 20 and 400 l/m 2 /s at 200 Pa, more preferably between 80 and 200 l/m 2 /s at 200 Pa.
- the flow rate through the filter medium is advantageously 1 to 20 cm/s, in particular 2 to 6 cm/s.
- a filter device with a filter housing and a filter element according to the invention as described above also falls within the scope of the present invention.
- the filter device is preferably an air filter.
- the filter housing typically has an inflow opening and an outflow opening for fluid to be filtered.
- the filter element can be arranged in the housing in order to separate a dirty side of the filter device assigned to the inflow opening from a clean side of the filter device assigned to the outflow opening.
- the filter device can be used to filter intake air in internal combustion engines or cathode air in fuel cells, in particular for vehicles. However, it can also be a ventilation filter or a gas turbine filter. Brief description of the drawings
- FIG. 1 shows a filter element according to the invention, in which a height of folds of a filter medium decreases steadily in a longitudinal direction and a width of the folds decreases in segments, in a schematic cross-sectional view;
- FIG. 2 shows a filter element according to the invention, in which a height and a width of folds of a filter medium decrease steadily in a longitudinal direction, in a schematic cross-sectional view;
- FIG 3 shows a filter device according to the invention with a filter element according to the invention arranged in a filter housing, in a schematic cross-sectional view.
- FIG. 1 shows a filter element 10.
- the filter element 10 has a pleated filter medium 12.
- FIG. The filter medium 12 can be held in a frame of the filter element 10 (not shown in more detail), wherein the frame can carry a peripheral seal or can itself be designed as such.
- the filter element 10 is designed as a so-called flat filter element, ie it extends between a dirty side and an opposite clean side, without an intermediate one enclose permeable cavity.
- the filter element 10 is essentially rectangular, but can in principle have any cross-sectional shape.
- the filter medium 12 has a large number of folds 14 .
- the folds 14 are arranged one after the other in a longitudinal direction 16 .
- the folds 14 are delimited on the one hand (at the bottom in FIG. 1) by first fold edges 18 .
- the folds 14 are delimited by the second folded edges 20 .
- Adjacent folds 14 adjoin one another at the second fold edges 20 .
- the first fold edges 18 all extend in a first plane 22 here.
- the second fold edges 20 can all extend in a second plane 24 .
- the first and the second folded edges 18, 20 can each run parallel to one another and in particular perpendicularly to the longitudinal direction 16. In FIG. 1, the folded edges 18, 20 run perpendicular to the plane of the drawing.
- the filter medium 12 extends in the longitudinal direction 16 from a first transverse side 26 to a second transverse side 28.
- the folds 14 of the filter medium 12 each have a different height 30 .
- the height 30 can be measured as the (mean) distance of the first folded edge 18 from the second folded edges 20 of a respective fold 14 perpendicular to the longitudinal direction and perpendicular to the folded edges 18, 20.
- the height 30 of each fold 14 arranged closer to the second transverse side 28 is here smaller than a height 30 of each fold 14 arranged closer to the first transverse side 26. Folds 14 arranged closer to the first transverse side 26 therefore have a greater height 30 than closer folds 14 arranged on the second transverse side 28. In other words, the height 30 of the folds 14 decreases continuously in the longitudinal direction 16 from the first transverse side 26 to the second transverse side 28.
- the folds 14 of the filter medium 12 have different widths 32a, 32b, 32c.
- the filter medium 12 here has a plurality of segments 34a, 34b, 34c, in which the widths 32a, 32b, 32c of the folds 14 are each of the same size. In other words, all folds 14 of one of the segments 34a, 34b, 34c each have the same width 32a, 32b or 32c.
- the folds 14 of a segment 34a, 34b arranged closer to the first transverse side 26 have a greater width 32a, 32b than the folds 14 of a segment 34b, 34c arranged closer to the second transverse side 28. In other words, takes the Width 32a, 32b, 32c of the folds 14 in the longitudinal direction 16 from segments. In this way, the width 32a, 32b, 32c of the folds 14 decreases continuously from the first transverse side 26 to the second transverse side 28.
- Example 1 For an air filter element for filtering intake air for an internal combustion engine with a media permeability of 80 to 250 l/m 2 /s and a filtration speed of 2-8 cm/s, the following values have proven to be particularly advantageous:
- the fold height in the first segment 34a decreases from approximately 500 mm to approximately 400 mm and the fold spacing is a constant value between 3.7 and 6.0, for example 4.5 mm.
- the fold height in the second segment 34b decreases from 400 mm to 275 mm and the fold pitch is 3.3 to 4.5 mm, for example 3.7 mm.
- the fold height in the third segment 34c is between 275 mm and 175 mm, with a fold spacing between 3.0 and 3.7 mm, for example 3.3 mm.
- the third segment 34c can be adjoined by a fourth segment (not shown), within which the fold heights decrease from about 175 mm, preferably to a height of about 75 mm, and which has a fold pitch between 2.5 mm and 3 .3mm.
- Example 2 For an air filter element for HVAC applications with a media permeability of 25 l/m 2 /s and a filtration speed of 1-3 cm/s, the fold pitch in the first segment 34a is between 5.0 and 10.0 mm, for example 6 mm, in the second segment 34b between 4.0 and 8.0 mm and in the third segment 34c between 4.0 and 6.0 mm, while the fold height as in the first embodiment in the first segment 34a between 400 and 500 mm, in the second segment 34b is between 275 and 400 mm and in the third segment 34c between 275 and 175 mm. In a fourth segment, not shown, with a fold height of between 75 and 175 mm, the fold pitch is 3.5 to 5.0 mm.
- FIG. 2 shows a further filter element 40.
- the filter element 40 is constructed similarly to the filter element 10 from FIG. 1. The differences are primarily described below. For the rest, reference is made to the preceding description. In the case of the filter element 40--as in the case of the filter element 10 of FIG. The height 30 of the folds 14 decreases continuously from a first transverse side 26 to a second transverse side 28 .
- each fold 14 arranged closer to the second transverse side 28 is smaller than a width 32 of each fold 14 arranged closer to the first transverse side 26. Folds 14 arranged closer to the first transverse side 26 therefore have a greater width 32 than closer folds 14 arranged on the second transverse side 28. In this way, the width 32 of the folds 14 decreases continuously from the first transverse side 26 to the second transverse side 28. A ratio of the respective height 30 and the respective width 32 can have the same value for each of the folds 14 .
- FIG. 3 shows a filter device 50.
- the filter device 50 is designed here as an air filter.
- the filter device 50 can be used to filter combustion air for an internal combustion engine, to filter cathode air for a fuel cell or as an interior air filter in a motor vehicle.
- the filter device 50 has a filter housing 52 .
- a filter element is arranged in the filter housing 52, for example the filter element 10 from FIG. 1 or the filter element 40 from FIG. 40 can seal the filter medium 12 with respect to the filter housing 52 .
- the raw side 54 communicates with an inflow opening 58.
- the clean side 56 communicates with an outflow opening 60.
- the air to be filtered flows through the inflow opening 58 into the raw side 54.
- the air then passes through the filter element 10/40, with dirt particles in the filter medium 12 are held back so that filtered air reaches the clean side 56.
- the filtered air flows from the clean side 56 through the outflow opening 60 out of the filter housing 52.
- the invention relates to a filter element with a pleated filter medium.
- the filter element can be a flat filter element.
- a height and a width (pitch) of folds of the filter medium is variable. In a longitudinal direction, both the height and the width of the folds can decrease continuously. Folds with a larger width have a greater height than folds with a smaller width.
- first folded edges 18 second folded edges 20 first level 22 second level 24 first transverse side 26 second transverse side 28
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Filtering Materials (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112021006253.0T DE112021006253A5 (de) | 2020-12-03 | 2021-12-02 | Filterelement und Filtereinrichtung |
US18/328,173 US20230302391A1 (en) | 2020-12-03 | 2023-06-02 | Filter element and filter device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020132167.8 | 2020-12-03 | ||
DE102020132167.8A DE102020132167A1 (de) | 2020-12-03 | 2020-12-03 | Filterelement und Filtereinrichtung |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US18/328,173 Continuation US20230302391A1 (en) | 2020-12-03 | 2023-06-02 | Filter element and filter device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022117707A1 true WO2022117707A1 (de) | 2022-06-09 |
Family
ID=79024777
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2021/083921 WO2022117707A1 (de) | 2020-12-03 | 2021-12-02 | Filterelement und filtereinrichtung |
Country Status (3)
Country | Link |
---|---|
US (1) | US20230302391A1 (de) |
DE (2) | DE102020132167A1 (de) |
WO (1) | WO2022117707A1 (de) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19816431A1 (de) * | 1997-04-18 | 1998-10-22 | Mann & Hummel Filter | Filterelement für einen Luftfilter und ein Verfahren zu dessen Herstellung |
US5897776A (en) | 1997-10-03 | 1999-04-27 | Dana Corporation | Filter media configuration |
FR2865406A1 (fr) * | 2004-01-22 | 2005-07-29 | Acanthe | Diffuseur a effet parietal |
US20070270095A1 (en) * | 2006-05-17 | 2007-11-22 | Denso Corporation | Car air conditioner |
CN201752600U (zh) | 2010-08-03 | 2011-03-02 | 东莞市佳美滤清器有限公司 | 使用滤芯的内压式过滤器的滤芯结构 |
DE102015013370A1 (de) * | 2014-10-20 | 2016-04-21 | Mann + Hummel Gmbh | Filterelement, insbesondere für ein Kraftfahrzeug sowie Verfahren zum Herstellen eines Filterelements |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITTO20120185A1 (it) | 2012-03-02 | 2013-09-03 | Cornaglia G Off Met Spa | Cartuccia filtro aria per motori endotermici, suo metodo di fabbricazione e filtro aria che incorpora detta cartuccia. |
-
2020
- 2020-12-03 DE DE102020132167.8A patent/DE102020132167A1/de not_active Withdrawn
-
2021
- 2021-12-02 DE DE112021006253.0T patent/DE112021006253A5/de active Pending
- 2021-12-02 WO PCT/EP2021/083921 patent/WO2022117707A1/de active Application Filing
-
2023
- 2023-06-02 US US18/328,173 patent/US20230302391A1/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19816431A1 (de) * | 1997-04-18 | 1998-10-22 | Mann & Hummel Filter | Filterelement für einen Luftfilter und ein Verfahren zu dessen Herstellung |
US5897776A (en) | 1997-10-03 | 1999-04-27 | Dana Corporation | Filter media configuration |
FR2865406A1 (fr) * | 2004-01-22 | 2005-07-29 | Acanthe | Diffuseur a effet parietal |
US20070270095A1 (en) * | 2006-05-17 | 2007-11-22 | Denso Corporation | Car air conditioner |
CN201752600U (zh) | 2010-08-03 | 2011-03-02 | 东莞市佳美滤清器有限公司 | 使用滤芯的内压式过滤器的滤芯结构 |
DE102015013370A1 (de) * | 2014-10-20 | 2016-04-21 | Mann + Hummel Gmbh | Filterelement, insbesondere für ein Kraftfahrzeug sowie Verfahren zum Herstellen eines Filterelements |
Also Published As
Publication number | Publication date |
---|---|
DE102020132167A1 (de) | 2022-06-09 |
DE112021006253A5 (de) | 2023-09-14 |
US20230302391A1 (en) | 2023-09-28 |
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