EP1911960B1 - Filter device, in particular for filtering combustion air in combustion engines - Google Patents

Filter device, in particular for filtering combustion air in combustion engines Download PDF

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Publication number
EP1911960B1
EP1911960B1 EP07116806A EP07116806A EP1911960B1 EP 1911960 B1 EP1911960 B1 EP 1911960B1 EP 07116806 A EP07116806 A EP 07116806A EP 07116806 A EP07116806 A EP 07116806A EP 1911960 B1 EP1911960 B1 EP 1911960B1
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European Patent Office
Prior art keywords
filter
filtering device
air
wall
tube
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EP07116806A
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German (de)
French (fr)
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EP1911960A3 (en
EP1911960A2 (en
Inventor
Stefan Walz
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Mann and Hummel GmbH
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Mann and Hummel GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/024—Air cleaners using filters, e.g. moistened
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/04—Air cleaners specially arranged with respect to engine, to intake system or specially adapted to vehicle; Mounting thereon ; Combinations with other devices

Definitions

  • the invention relates to a filter device, in particular for the filtration of air in vehicles, for example combustion air in internal combustion engines or air for the vehicle interior, according to the preamble of claim 1.
  • An intake filter for an internal combustion engine of a vehicle which comprises a filter element as a plurality of filter bags, which are arranged in the engine compartment of the motor vehicle.
  • the filter bags are made of a flexible filter material and are flowed through by the supplied combustion air radially from outside to inside.
  • the purified combustion air is supplied via the interior of the filter bags an air collection box to which the filter bags are connected and which is connected to the cylinder inlets of the internal combustion engine.
  • An advantage of this suction filter is that the filter surface and thus the filter performance can be adjusted by the number and design of the filter bags to the respective needs as a function of the selected internal combustion engine.
  • the invention is based, to improve the separation efficiency of a filter device with simple measures the task.
  • the filter device has a filter element designed as a filter tube, the filter wall of which flows radially through the fluid to be cleaned.
  • the filter wall is provided with a microfiltration layer consisting of nanofibers.
  • this nanofiber layer can be made very thin so that the entire thickness, seen in the radial direction, of the filter wall, including the nanofiber layer, is barely larger than without this layer.
  • the nanofiber layer allows a considerable increase in the degree of separation.
  • the nanofiber layer is arranged on the outflow side of the filter wall of the filter tube, so that in the flow direction, an increasing degree of separation is given. Larger particles of dirt settle on the upstream side of the filter wall, the finest particles of dirt are retained by the nanofiber layer on the downstream side of the filter wall.
  • the nanofibers are expediently produced from a polymer-based fiber material; they consist, for example, of PES (polyethersulfone), PP (polypropylene), PA (polyamide) or PC (polycarbonate or polyester).
  • the filter material from which the filter wall of the filter bag consists is expediently based on synthetic material, in particular polymer-based. In principle, however, filter materials are also suitable on a natural basis, in particular based on cellulose.
  • the filter wall has an increasing density from the inflow to the outflow side. This is advantageously done with discrete filter layers achieved, in particular with two filter layers, of which the inflow side facing layer is formed as a coarse filtration layer and the outflow side facing layer as a fine filtration layer. On the outflow side of the fine filtration layer is the ultrafine filtration coating of nanofibers, so that three layers or layers are provided in total in cross section of the filter wall.
  • the filter device with the coated filter tube can be used in different structural configurations.
  • such a filter tube has a high stability and a large filter area, at the same time the filter tube is flexible both in the axial direction and in the radial direction.
  • a concertina effect is achieved, which means that a deflection of the filter tube axially or radially from its unloaded starting position automatically returns as soon as the filter element is again free of external forces.
  • the coated filter tube is accommodated in a carrier tube of solid material, in particular of plastic, wherein the inner diameter of the carrier tube is greater than the outer diameter of the filter tube, so that between the outer jacket of the filter tube and the inner jacket of the carrier tube, an annular space for the flow of the fluid is formed.
  • the carrier tube may have different courses, which, because of the flexibility of the filter tube, may also be executed by it.
  • the filter device according to the invention is particularly suitable for the filtration of combustion air in internal combustion engines, preferably for internal combustion engines of commercial vehicles.
  • the application is not limited to this; Rather, a filtration is generally of gaseous and optionally also of liquid fluids into consideration.
  • Fig. 1 a schematic representation of the engine compartment of a motor vehicle with therein arranged filter device for filtering the combustion air, wherein the filter device is designed as a carrier tube with filter tube accommodated therein,
  • Fig. 2 a section through the wall of the filter tube, which has a coarse filtration layer on the upstream side and a fine filtration layer on the downstream side, wherein a coating with nanofibers is additionally provided on the fine filtration layer on the downstream side,
  • FIG. 3 in a perspective view of a filter tube, in the wall folds are introduced.
  • Fig. 1 the engine compartment 1 of a motor vehicle with internal combustion engine 2 arranged therein is shown.
  • the cylinder inlets of the internal combustion engine 2 is supplied via a port 3 filtered combustion air, which is filtered in an upstream filter device 4.
  • the filter device 4 consists of a carrier tube 5, which takes over the function of the filter housing, and a filter tube 6 arranged in the carrier tube, which extends over the axial length of the carrier tube 5.
  • the filter tube 6 in the carrier tube 5 has a smaller cross-section, whereby an annular space 8 is provided between the outer jacket of the filter tube 6 and the inner jacket of the carrier tube 5, extending between the axial end faces of the carrier tube and the filter tube extends and represents a flow space for the combustion air.
  • the carrier tube 5 with the filter tube 6 extends between the vehicle front 7 and the opening 3, which is associated with the intake ports of the internal combustion engine 2.
  • the combustion air flowing against the vehicle front 7 is introduced axially into the interior of the filter tube 6, the opposite end face of which is closed.
  • the unpurified combustion air is therefore forced to flow through the filter walls of the filter tube 6 radially, whereby the entrained in the combustion air dirt particles are deposited.
  • the clean air flows axially through the annular space 8 between the filter tube 6 and support tube 5 to the opening.
  • the annular space 8 acts as a raw side and the interior of the filter bag as a clean side.
  • Fig. 2 the wall of the filter tube 6 is shown in section.
  • the arrow 12 indicates the flow direction, the inflow side is marked at 13 and the outflow side at 14.
  • the filter wall has a multilayer structure and comprises a coarse filtration layer 9 on the inflow side 13 and a fine filtration layer 10 facing the outflow side 14.
  • This fine filtration layer 10 is provided on the outflow side with a microfiltration coating 11 made of nanofibers.
  • the Filter wall in the flow direction 12 of the fluid to be filtered seen a multilayer structure, wherein the density or the degree of separation increases from layer to layer.
  • the thickness of the microfiltration coating 11 is negligible compared to the thickness of the other two layers 9 and 10.
  • the thickness of the microfiltration coating 11 is a maximum of one tenth, possibly even one hundredth of the thickness of the two layers 9 and 10 taken together.
  • the diameter of the nanofibers is advantageously less than 1 .mu.m and is in particular in a range between 50 nm to 500 nm.
  • a filter tube 6 is shown in perspective view, the filter wall in the in Fig. 2 constructed way shown.
  • the filter tube 6 has a plurality of folds 16, which are arranged distributed in the axial direction and in the circumferential direction. Some of the folds 16 have filter edges 17, which enclose an angle with the longitudinal axis 15 of the filter element-or with a longitudinal center plane-that is, at an angle relative to the longitudinal axis.
  • the filter tube receives a balger motivation structure that gives him a high stability and high flexibility at the same time both in the longitudinal and in the radial direction.
  • the filter device is particularly suitable for the filtration of combustion air in internal combustion engines. But it is also one Application for the filtration of the vehicle interior air or generally for the filtration in vehicles possible.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Description

Technisches GebietTechnical area

Die Erfindung bezieht sich auf eine Filtereinrichtung, insbesondere zur Filtration von Luft in Fahrzeugen, beispielsweise Verbrennungsluft in Brennkraftmaschinen oder Luft für den Fahrzeuginnenraum, nach dem Oberbegriff des Anspruches 1.The invention relates to a filter device, in particular for the filtration of air in vehicles, for example combustion air in internal combustion engines or air for the vehicle interior, according to the preamble of claim 1.

Stand der TechnikState of the art

In der WO 2005/095783 A1 wird ein Ansaugfilter für eine Brennkraftmaschine eines Fahrzeuges beschrieben, der als Filterelement eine Mehrzahl von Filterschläuchen umfasst, die im Motorraum des Kraftfahrzeugs angeordnet sind. Die Filterschläuche bestehen aus einem flexiblen Filtermaterial und werden von der herangeführten Verbrennungsluft radial von außen nach innen durchströmt. Die gereinigte Verbrennungsluft wird über den Innenraum der Filterschläuche einer Luftsammelbox zugeführt, an die die Filterschläuche angeschlossen sind und die mit den Zylindereinlässen der Brennkraftmaschine verbunden ist. Zum Schutz der Filterschläuche sind diese von einer Abdeckung überdeckt. Vorteilhaft an diesem Ansaugfilter ist, dass die Filterfläche und damit auch die Filterleistung durch die Anzahl und Ausführung der Filterschläuche an den jeweiligen Bedarf in Abhängigkeit der gewählten Brennkraftmaschine angepasst werden kann.In the WO 2005/095783 A1 An intake filter for an internal combustion engine of a vehicle is described, which comprises a filter element as a plurality of filter bags, which are arranged in the engine compartment of the motor vehicle. The filter bags are made of a flexible filter material and are flowed through by the supplied combustion air radially from outside to inside. The purified combustion air is supplied via the interior of the filter bags an air collection box to which the filter bags are connected and which is connected to the cylinder inlets of the internal combustion engine. To protect the filter bags they are covered by a cover. An advantage of this suction filter is that the filter surface and thus the filter performance can be adjusted by the number and design of the filter bags to the respective needs as a function of the selected internal combustion engine.

Mit steigenden Anforderungen an die Leistungsfähigkeit moderner Brennkraftmaschinen, insbesondere auch im Hinblick auf das Emissionsverhalten, werden auch höhere Forderungen an den Abscheidegrad der Luftfiltereinrichtungen gestellt. Die durch das Filterelement noch hindurchtretenden Staubpartikel sollen daher weiter reduziert werden.With increasing demands on the performance of modern internal combustion engines, especially with regard to the emission behavior, higher demands are placed on the separation efficiency of the air filter devices. The still passing through the filter element dust particles should therefore be further reduced.

Weitere Filteranordnungen sind aus Dokumente US 2004/255783 A1 , US 2003/010002 A1 und US 2004/0211160 A1 offenbart.Other filter arrangements are from documents US 2004/255783 A1 . US 2003/010002 A1 and US 2004/0211160 A1 disclosed.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt die Aufgabe zugrunde, mit einfachen Maßnahmen den Abscheidegrad einer Filtereinrichtung zu verbessern.The invention is based, to improve the separation efficiency of a filter device with simple measures the task.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Anspruches 1 gelöst. Die Unteransprüche geben zweckmäßige Weiterbildungen an.This object is achieved with the features of claim 1. The dependent claims indicate expedient developments.

Die erfindungsgemäße Filtereinrichtung weist ein als Filterschlauch ausgebildetes Filterelement auf, dessen Filterwandung radial von dem zu reinigenden Fluid durchströmt wird. Zur Verbesserung der Filtrationsleistungen des Abscheidegrads ist die Filterwandung mit einer Feinstfiltrationsschicht versehen, die aus Nanofasern besteht. Diese Nanofaserschicht kann einerseits sehr dünn ausgebildet werden, so dass die gesamte Dicke, in Radialrichtung gesehen, der Filterwandung einschließlich der Nanofaserschicht kaum größer ist als ohne diese Schicht. So kann es beispielsweise vorteilhaft sein, die Nanofaserschicht mit maximal einem Zehntel der Dicke der restlichen Filterwandung auszubilden, wobei gegebenenfalls auch erheblich geringere Stärken der Nanofaserschicht in Betracht kommen, beispielsweise ein Hundertstel der Filterwanddicke. Aufgrund der geringen Dicke der Nanofaserschicht und der verhältnismäßig geringen Dichte ist auch das Gesamtgewicht des Filterelementes praktisch nicht erhöht.The filter device according to the invention has a filter element designed as a filter tube, the filter wall of which flows radially through the fluid to be cleaned. To improve the filtration performance of the degree of separation, the filter wall is provided with a microfiltration layer consisting of nanofibers. On the one hand, this nanofiber layer can be made very thin so that the entire thickness, seen in the radial direction, of the filter wall, including the nanofiber layer, is barely larger than without this layer. Thus, it may be advantageous, for example, to form the nanofiber layer with a maximum of one-tenth of the thickness of the remaining filter wall, wherein, if appropriate, significantly lower thicknesses of the Nanofiber layer come into consideration, for example, a hundredth of the filter wall thickness. Due to the small thickness of the nanofiber layer and the relatively low density and the total weight of the filter element is practically not increased.

Zugleich ermöglicht die Nanofaserschicht eine erhebliche Steigerung des Abscheidegrades. Die Nanofaserschicht ist auf der Abströmseite der Filterwandung des Filterschlauches angeordnet, so dass in Durchströmrichtung ein zunehmender Abscheidegrad gegeben ist. Größere Schmutzpartikel lagern sich auf der Anströmseite der Filterwandung ab, feinste Schmutzpartikel werden von der Nanofaserschicht auf der Abströmseite der Filterwandung zurückgehalten.At the same time, the nanofiber layer allows a considerable increase in the degree of separation. The nanofiber layer is arranged on the outflow side of the filter wall of the filter tube, so that in the flow direction, an increasing degree of separation is given. Larger particles of dirt settle on the upstream side of the filter wall, the finest particles of dirt are retained by the nanofiber layer on the downstream side of the filter wall.

Die Nanofasern sind zweckmäßig aus einem Fasermaterial auf Polymerbasis hergestellt, sie bestehen beispielsweise aus PES (Polyethersulfon), PP (Polypropylen), PA (Polyamid) oder PC (Polycarbonat oder Polyester). Auch das Filtermaterial, aus dem die Filterwandung des Filterschlauches besteht, basiert zweckmäßig auf synthetischem Material, insbesondere auf Polymerbasis. Grundsätzlich kommen aber auch Filterwerkstoffe auf natürlicher Basis in Betracht, insbesondere auf Zellulosebasis.The nanofibers are expediently produced from a polymer-based fiber material; they consist, for example, of PES (polyethersulfone), PP (polypropylene), PA (polyamide) or PC (polycarbonate or polyester). Also, the filter material from which the filter wall of the filter bag consists is expediently based on synthetic material, in particular polymer-based. In principle, however, filter materials are also suitable on a natural basis, in particular based on cellulose.

Gemäß einer vorteilhaften Ausführung ist vorgesehen, dass die Filterwandung von der Anström- zur Abströmseite hin eine zunehmende Dichte aufweist. Dies wird vorteilhafterweise mit diskreten Filterlagen erreicht, insbesondere mit zwei Filterlagen, von denen die der Anströmseite zugewandte Lage als Grobfiltrationsschicht und die der Abströmseite zugewandte Lage als Feinfiltrationsschicht ausgebildet ist. Auf der Abströmseite der Feinfiltrationsschicht befindet sich die Feinstfiltrationsbeschichtung aus Nanofasern, so dass insgesamt gesehen im Querschnitt der Filterwandung drei Lagen bzw. Schichten vorgesehen sind.According to an advantageous embodiment, it is provided that the filter wall has an increasing density from the inflow to the outflow side. This is advantageously done with discrete filter layers achieved, in particular with two filter layers, of which the inflow side facing layer is formed as a coarse filtration layer and the outflow side facing layer as a fine filtration layer. On the outflow side of the fine filtration layer is the ultrafine filtration coating of nanofibers, so that three layers or layers are provided in total in cross section of the filter wall.

Die Filtereinrichtung mit dem beschichteten Filterschlauch kann in unterschiedlichen konstruktiven Ausgestaltungen eingesetzt werden. So ist es beispielsweise möglich, den Filterschlauch mit Falten zu versehen, deren Faltenkanten sich in Achslängsrichtung, quer zur Achse und/oder in einem Winkel schräg zur Achse erstrecken können. Insbesondere in dem letztgenannten Fall besitzt ein derartiger Filterschlauch eine hohe Stabilität und eine große Filterfläche, zugleich ist der Filterschlauch sowohl in Achsrichtung als auch in Radialrichtung flexibel ausgebildet. Außerdem wird ein Ziehharmonika-Effekt erreicht, der dazu führt, dass eine Auslenkung des Filterschlauches axial oder radial aus seiner unbelasteten Ausgangslage wieder selbsttätig zurückgeht, sobald das Filterelement wieder frei von äußeren Kräften ist.The filter device with the coated filter tube can be used in different structural configurations. For example, it is possible to provide the filter tube with folds whose fold edges can extend in the axial longitudinal direction, transverse to the axis and / or at an angle oblique to the axis. In particular, in the latter case, such a filter tube has a high stability and a large filter area, at the same time the filter tube is flexible both in the axial direction and in the radial direction. In addition, a concertina effect is achieved, which means that a deflection of the filter tube axially or radially from its unloaded starting position automatically returns as soon as the filter element is again free of external forces.

Aber auch ein Filterschlauch mit glatten und faltenfreien Wandungen besitzt ein hohes Maß an Flexibilität, insbesondere in Querrichtung. Dies ermöglichst es, unterschiedliche Geometrien von Filtereinrichtungen zu gestalten, wobei aufgrund der Flexibilität ein hoher Grad an Gleichteileverwendung erreicht werden kann. Dies bedeutet, dass gleiche Filterschläuche für unterschiedliche Geometrien insbesondere des Filtergehäuses verwendet werden können.But even a filter hose with smooth and wrinkle-free walls has a high degree of flexibility, especially in the transverse direction. This allows different geometries of filter devices design, where due to the flexibility of a high degree of common parts use can be achieved. This means that the same filter bags can be used for different geometries, in particular of the filter housing.

Gemäß einer bevorzugten Ausführung ist der beschichtete Filterschlauch in einem Trägerrohr aus festem Material, insbesondere aus Kunststoff aufgenommen, wobei der Innendurchmesser des Trägerrohrs größer ist als der Außendurchmesser des Filterschlauches, so dass zwischen dem Außenmantel des Filterschlauches und dem Innenmantel des Trägerrohres ein Ringraum für die Strömung des Fluids gebildet ist. Das Trägerrohr kann je nach Anforderungen und konstruktiven Gegebenheiten unterschiedliche Verläufe aufweisen, die aufgrund der Flexibilität des Filterschlauches von diesem ebenfalls ausgeführt werden können.According to a preferred embodiment, the coated filter tube is accommodated in a carrier tube of solid material, in particular of plastic, wherein the inner diameter of the carrier tube is greater than the outer diameter of the filter tube, so that between the outer jacket of the filter tube and the inner jacket of the carrier tube, an annular space for the flow of the fluid is formed. Depending on the requirements and constructional conditions, the carrier tube may have different courses, which, because of the flexibility of the filter tube, may also be executed by it.

Die erfindungsgemäße Filtereinrichtung eignet sich insbesondere zur Filtration von Verbrennungsluft in Brennkraftmaschinen, bevorzugt für Brennkraftmaschinen von Nutzfahrzeugen. Jedoch ist die Anwendung nicht darauf beschränkt; vielmehr kommt eine Filtrierung allgemein von gasförmigen und gegebenenfalls auch von flüssigen Fluiden in Betracht.The filter device according to the invention is particularly suitable for the filtration of combustion air in internal combustion engines, preferably for internal combustion engines of commercial vehicles. However, the application is not limited to this; Rather, a filtration is generally of gaseous and optionally also of liquid fluids into consideration.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Weitere Vorteile und zweckmäßige Ausführungen sind den weiteren Ansprüchen, der Figurenbeschreibung und den Zeichnungen zu entnehmen. Es zeigen:Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:

Fig. 1 in schematischer Darstellung den Motorraum eines Kraftfahrzeugs mit darin angeordneter Filtereinrichtung zur Filterung der Verbrennungsluft, wobei die Filtereinrichtung als Trägerrohr mit darin aufgenommenem Filterschlauch ausgebildet ist, Fig. 1 a schematic representation of the engine compartment of a motor vehicle with therein arranged filter device for filtering the combustion air, wherein the filter device is designed as a carrier tube with filter tube accommodated therein,

Fig. 2 einen Schnitt durch die Wandung des Filterschlauches, die auf der Anströmseite eine Grobfiltrationsschicht und auf der Abströmseite eine Feinfiltrationsschicht aufweist, wobei zusätzlich auf der Abströmseite eine Beschichtung mit Nanofasern auf der Feinfiltrationsschicht vorgesehen ist, Fig. 2 a section through the wall of the filter tube, which has a coarse filtration layer on the upstream side and a fine filtration layer on the downstream side, wherein a coating with nanofibers is additionally provided on the fine filtration layer on the downstream side,

Fig. 3 in perspektivischer Darstellung einen Filterschlauch, in dessen Wandung Falten eingebracht sind. Fig. 3 in a perspective view of a filter tube, in the wall folds are introduced.

Ausführungsformen der ErfindungEmbodiments of the invention

In Fig. 1 ist der Motorraum 1 eines Kraftfahrzeugs mit darin angeordneter Brennkraftmaschine 2 dargestellt. Den Zylindereinlässen der Brennkraftmaschine 2 wird über eine Öffnung 3 gefilterte Verbrennungsluft zugeführt, die in einer vorgelagerten Filtereinrichtung 4 gefiltert wird. Die Filtereinrichtung 4 besteht aus einem Trägerrohr 5, das die Funktion des Filtergehäuses übernimmt, und einem im Trägerrohr angeordneten Filterschlauch 6, der sich über die axiale Länge des Trägerrohrs 5 erstreckt. Der Filterschlauch 6 im Trägerrohr 5 weist einen kleineren Querschnitt auf, wodurch zwischen dem Außenmantel des Filterschlauches 6 und dem Innenmantel des Trägerrohrs 5 ein Ringraum 8 gegeben ist, der sich zwischen den axialen Stirnseiten des Trägerrohrs und des Filterschlauches erstreckt und einen Strömungsraum für die Verbrennungsluft darstellt. Das Trägerrohr 5 mit dem Filterschlauch 6 verläuft zwischen der Fahrzeugfront 7 und der Öffnung 3, die den Einlasskanälen der Brennkraftmaschine 2 zugeordnet ist. Die die Fahrzeugfront 7 anströmende Verbrennungsluft wird axial in das Innere des Filterschlauches 6 eingeführt, dessen gegenüberliegende Stirnseite verschlossen ist. Die ungereinigte Verbrennungsluft ist daher gezwungen, die Filterwandungen des Filterschlauches 6 radial zu durchströmen, wodurch die in der Verbrennungsluft mitgeführten Schmutzpartikel abgeschieden werden. Die Reinluft strömt axial über den Ringraum 8 zwischen Filterschlauch 6 und Trägerrohr 5 zur Öffnung 3.In Fig. 1 the engine compartment 1 of a motor vehicle with internal combustion engine 2 arranged therein is shown. The cylinder inlets of the internal combustion engine 2 is supplied via a port 3 filtered combustion air, which is filtered in an upstream filter device 4. The filter device 4 consists of a carrier tube 5, which takes over the function of the filter housing, and a filter tube 6 arranged in the carrier tube, which extends over the axial length of the carrier tube 5. The filter tube 6 in the carrier tube 5 has a smaller cross-section, whereby an annular space 8 is provided between the outer jacket of the filter tube 6 and the inner jacket of the carrier tube 5, extending between the axial end faces of the carrier tube and the filter tube extends and represents a flow space for the combustion air. The carrier tube 5 with the filter tube 6 extends between the vehicle front 7 and the opening 3, which is associated with the intake ports of the internal combustion engine 2. The combustion air flowing against the vehicle front 7 is introduced axially into the interior of the filter tube 6, the opposite end face of which is closed. The unpurified combustion air is therefore forced to flow through the filter walls of the filter tube 6 radially, whereby the entrained in the combustion air dirt particles are deposited. The clean air flows axially through the annular space 8 between the filter tube 6 and support tube 5 to the opening. 3

Grundsätzlich ist auch eine Durchströmung der Filterwandung des Filterschlauches 6 in Gegenrichtung, also radial von außen nach innen möglich. In diesem Fall fungiert der Ringraum 8 als Rohseite und das Innere des Filterschlauches als Reinseite.In principle, a flow through the filter wall of the filter bag 6 in the opposite direction, ie radially from outside to inside is possible. In this case, the annular space 8 acts as a raw side and the interior of the filter bag as a clean side.

In Fig. 2 ist die Wandung des Filterschlauches 6 im Schnitt dargestellt. Der Pfeil 12 kennzeichnet die Strömungsrichtung, die Anströmseite ist mit 13 und die Abströmseite mit 14 markiert. Die Filterwandung ist mehrlagig aufgebaut und umfasst eine Grobfiltrationsschicht 9 auf der Anströmseite 13 und eine der Abströmseite 14 zugewandte Feinfiltrationsschicht 10. Diese Feinfiltrationsschicht 10 ist abströmseitig mit einer Feinstfiltrationsbeschichtung 11 aus Nanofasern versehen. Somit weist die Filterwandung in Strömungsrichtung 12 des zu filtrierenden Fluids gesehen einen mehrlagigen Aufbau auf, wobei die Dichte bzw. der Abscheidegrad von Lage zu Lage zunimmt. Die Dicke der Feinstfiltrationsbeschichtung 11 ist im Vergleich zur Dicke der beiden anderen Schichten 9 und 10 verschwindend gering. Beispielhaft beträgt die Dicke der Feinstfiltrationsbeschichtung 11 maximal ein Zehntel, gegebenenfalls auch nur ein Hundertstel der Dicke der beiden Schichten 9 und 10 zusammengenommen. Der Durchmesser der Nanofasern beträgt vorteilhafterweise weniger als 1 µm und liegt insbesondere in einem Bereich zwischen 50 nm bis 500 nm.In Fig. 2 the wall of the filter tube 6 is shown in section. The arrow 12 indicates the flow direction, the inflow side is marked at 13 and the outflow side at 14. The filter wall has a multilayer structure and comprises a coarse filtration layer 9 on the inflow side 13 and a fine filtration layer 10 facing the outflow side 14. This fine filtration layer 10 is provided on the outflow side with a microfiltration coating 11 made of nanofibers. Thus, the Filter wall in the flow direction 12 of the fluid to be filtered seen a multilayer structure, wherein the density or the degree of separation increases from layer to layer. The thickness of the microfiltration coating 11 is negligible compared to the thickness of the other two layers 9 and 10. By way of example, the thickness of the microfiltration coating 11 is a maximum of one tenth, possibly even one hundredth of the thickness of the two layers 9 and 10 taken together. The diameter of the nanofibers is advantageously less than 1 .mu.m and is in particular in a range between 50 nm to 500 nm.

In Fig. 3 ist ein Filterschlauch 6 in perspektivischer Ansicht dargestellt, dessen Filterwandung in der in Fig. 2 gezeigten Weise aufgebaut ist. Der Filterschlauch 6 weist eine Vielzahl von Falten 16 auf, die in Achsrichtung sowie in Umfangsrichtung verteilt angeordnet sind. Die Falten 16 besitzen zum Teil Filterkanten 17, die mit der Längsachse 15 des Filterelementes - bzw. mit einer Längsmittelebene - einen Winkel einschließen, also bezogen auf die Längsachse schräg verlaufen. Hierdurch erhält der Filterschlauch eine balgähnliche Struktur, die ihm eine hohe Stabilität und zugleich hohe Flexibilität sowohl in Längs- als auch in Radialrichtung verleiht.In Fig. 3 a filter tube 6 is shown in perspective view, the filter wall in the in Fig. 2 constructed way shown. The filter tube 6 has a plurality of folds 16, which are arranged distributed in the axial direction and in the circumferential direction. Some of the folds 16 have filter edges 17, which enclose an angle with the longitudinal axis 15 of the filter element-or with a longitudinal center plane-that is, at an angle relative to the longitudinal axis. As a result, the filter tube receives a balgerartige structure that gives him a high stability and high flexibility at the same time both in the longitudinal and in the radial direction.

Die Filtereinrichtung eignet sich insbesondere für die Filtration von Verbrennungsluft in Brennkraftmaschinen. Es ist aber auch eine Anwendung für die Filtration der Fahrzeuginnenraumluft oder allgemein für die Filtration in Fahrzeugen möglich.The filter device is particularly suitable for the filtration of combustion air in internal combustion engines. But it is also one Application for the filtration of the vehicle interior air or generally for the filtration in vehicles possible.

Claims (9)

  1. Vehicle air filter device, for example for combustion air in internal combustion engines or air for the vehicle passenger compartment, with a filter element designed as filter sleeve (6) the filter wall of which separates radially the raw side from the clean side, characterized in that the filter wall of the filter sleeve (6) is provided at its outflow side with an ultrafine filtration coating (11) made of nano fibers.
  2. Filtering device according to claim 1, characterized in that the diameter of the nano fibers is less than 1 µm, in particular within a range between 50 nm and 500 nm.
  3. Filtering device according to claim 1 or 2, characterized in that the nano fibers are made of a fiber material on polymer basis, for example PES (polyethersulfone), PP (polypropylene), PA (polyamide) or PC (polycarbonate).
  4. Filtering device according to one of the claims 1 to 3, characterized in that the thickness of the ultrafine filtration coating (11) made of nano fibers is small with regard to the radial thickness of the filter wall.
  5. Filtering device according to one of the claims 1 to 4, characterized in that the filter wall features an increasing density from the inflow side (13) towards the outflow side (14).
  6. Filtering device according to claim 5, characterized in that the filter wall features at least two discrete filter layers in radial direction with the filter layer facing the inflow side (13) being designed as coarse filtration layer (9) and the filter layer facing the outflow side (14) being designed as fine filtration layer (10).
  7. Filtering device according to one of the claims 1 to 6, characterized in that the filter sleeve (6) consists of synthetic filter material, in particular of a filter material on polymer basis.
  8. Filtering device according to one of the claims 1 to 7, characterized in that the filter sleeve (6) is accommodated in a carrier pipe (5), between the outer case of the filter sleeve (6) and the inner case of the carrier pipe (5) an annular space (8) being formed for the flow of the fluid.
  9. Utilization of a filtering device according to one of the claims 1 to 8 as air filter for the internal combustion engine (2) of a commercial vehicle
EP07116806A 2006-10-09 2007-09-20 Filter device, in particular for filtering combustion air in combustion engines Not-in-force EP1911960B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006048076A DE102006048076A1 (en) 2006-10-09 2006-10-09 Filter device, in particular for the filtration of combustion air in internal combustion engines

Publications (3)

Publication Number Publication Date
EP1911960A2 EP1911960A2 (en) 2008-04-16
EP1911960A3 EP1911960A3 (en) 2010-10-27
EP1911960B1 true EP1911960B1 (en) 2012-06-27

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Application Number Title Priority Date Filing Date
EP07116806A Not-in-force EP1911960B1 (en) 2006-10-09 2007-09-20 Filter device, in particular for filtering combustion air in combustion engines

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US (1) US20080086992A1 (en)
EP (1) EP1911960B1 (en)
DE (1) DE102006048076A1 (en)

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Also Published As

Publication number Publication date
EP1911960A3 (en) 2010-10-27
EP1911960A2 (en) 2008-04-16
DE102006048076A1 (en) 2008-04-10
US20080086992A1 (en) 2008-04-17

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