WO2007057256A1 - Filter element and filter for exhaust-gas aftertreatment - Google Patents

Filter element and filter for exhaust-gas aftertreatment Download PDF

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Publication number
WO2007057256A1
WO2007057256A1 PCT/EP2006/067179 EP2006067179W WO2007057256A1 WO 2007057256 A1 WO2007057256 A1 WO 2007057256A1 EP 2006067179 W EP2006067179 W EP 2006067179W WO 2007057256 A1 WO2007057256 A1 WO 2007057256A1
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WO
WIPO (PCT)
Prior art keywords
filter element
cross
sectional area
channels
inlet
Prior art date
Application number
PCT/EP2006/067179
Other languages
German (de)
French (fr)
Inventor
Bernd Reinsch
Ruediger Herr
Teruo Komori
Lars Thuener
Stefan Motz
Matthias Kruse
Christian Schiller
Andreas Mattern
Christoph Osemann
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2007057256A1 publication Critical patent/WO2007057256A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/06—Exhaust treating devices having provisions not otherwise provided for for improving exhaust evacuation or circulation, or reducing back-pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/06—Ceramic, e.g. monoliths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/34—Honeycomb supports characterised by their structural details with flow channels of polygonal cross section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/48—Honeycomb supports characterised by their structural details characterised by the number of flow passages, e.g. cell density
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a filter element for cleaning the exhaust gases of an internal combustion engine according to the preamble of claim 1 and a soot filter with a filter element according to the independent claim 8.
  • Such filter elements are used for example as a soot filter for diesel internal combustion engines.
  • the filter elements often consist of a ceramic material and have a plurality of mutually parallel inlet channels and outlet channels.
  • Filter elements made of ceramic materials are produced by extrusion. This means that the blank of the filter element is a prismatic body with a plurality of mutually parallel channels. The channels of a blank are initially open at both ends.
  • Filter element closed, while another group of channels are closed at the front end of the filter element.
  • two groups of channels are formed, namely the so-called inlet channels, which are closed at the rear end and the so-called outlet channels, which are closed at the beginning of the filter element.
  • the invention has for its object to provide a filter element and a soot filter, in which the local accumulation of soot deposits, in particular in the interior of the filter element avoided, but at least reduced.
  • Inlet channels which are arranged on the inside of the filter element, larger than in the outside of the filter element arranged inlet channels.
  • An embodiment of the filter element according to the invention provides that the cross-sectional areas of the inlet ducts in the interior of the filter element are geometrically similar to the cross-sectional areas of the inlet ducts arranged at the periphery of the filter element and that the cross-sectional areas of the inlet ducts in the interior of the filter Filter element are smaller than the cross-sectional area of the arranged at the periphery of the filter element inlet channels.
  • Cross section of the filter element may be particularly advantageous if the filter element is cylindrical and rotationally symmetrical.
  • the cross-sectional areas of the inlet channels in the interior of the filter element can have a different geometry than the cross-sectional area of the inlet channels arranged at the periphery of the filter element.
  • the effect according to the invention can be focused better on a specific partial area in the interior of the filter element.
  • the inner region of a filter element according to the invention is dimensioned such that its dimensions correspond to those of the feed line.
  • the inventive design of the inlet channels is not limited to certain geometry of inlet channels, but is in principle applicable to many geometries of entrance channels.
  • the invention is particularly advantageous in entrance channels with square, rectangular, hexagonal or cross-shaped cross-section.
  • the filter element is rotationally symmetrical or centrally symmetrical with respect to its longitudinal axis.
  • Figure 2 is an exemplary embodiment of an inventive
  • Filter element in a view from the front and Figure 3 shows a section of a cross section through another inventive filter element.
  • Figure 1 illustrates a soot filter 1 with a feed line 3, a diffuser 5, a housing 7 and a filter element 9 according to the invention in a partially sectioned side view.
  • the soot filter 1 flows through in the direction of the arrows 11.
  • the housing 7 is adjoined by a cone 13 and a discharge line 15.
  • the filter element 9 is gas-tightly connected to the housing so that the exhaust gas (not shown) flowing through the supply line 3 has to flow through the filter element 9.
  • the filter element 9 has an inlet surface 17 and an outlet surface 19.
  • the filter element 19 is crossed by a plurality of channels which extend from the inlet surface 17 to the outlet surface 19.
  • the inlet channels 21 are open at the inlet surface 17 and closed at the outlet surface 19.
  • the so-called outlet channels 23 are closed at the inlet surface 17 and open at the outlet surface 19.
  • the closures of the inlet channel 21 and the outlet channel 23 are shown in Figure 1 as black areas without reference numerals.
  • FIG. 2 shows a cross section through an exemplary embodiment of a filter element 9 according to the invention.
  • FIG. 2 shows a cross section through a first exemplary embodiment of a filter element 9 according to the invention with a square cross section.
  • inlet channels 21 and outlet channels 23 alternate.
  • the inlet channel 21 and the outlet channel 23 have the shape of a square in the exemplary embodiment shown in FIG.
  • inlet channel and outlet channels 23 have a square cross-section with the edge length B.
  • the inlet channels 21 arranged further outward and the outlet channels 23 arranged further outside have a square cross-section with the edge length 2B.
  • FIG. 3 shows a partial embodiment of a second exemplary embodiment of a filter element according to the invention. Shown is only the inner region of the filter element.
  • the inlet channels 21 have the shape of a cross.
  • one of these cross-shaped cross-sectional areas is shown hatched in FIG.
  • the associated outlet channels 23 have a square cross-section.
  • Inlet channel 21 and the outlet channel 23 have different geometries.
  • the ratio between the circumference U and the cross-sectional area A of the inlet channel is again significantly increased compared with the example according to FIG. 2, so that in this geometry the accumulation of soot in the middle of the filter element is even more strongly suppressed becomes.
  • the outer regions, not shown, of this filter element 9 can be designed, as in the first exemplary embodiment, with square cross sections of both the inlet channels 21 and the outlet channels 23.

Abstract

The invention relates to a filter element (9) and a particulate filter (1), in which the temperature distribution remains approximately constant over the cross-section of the filter element (9). To achieve this, the ratio of the circumference to the cross-sectional surface of the inlet channels (21) that are situated in the inner region of the filter element (9) is greater than the same ratio for the inlet channels that are situated in the outer region of the filter element.

Description

Filterelement und Filter zur AbgasnachbehandlungFilter element and filter for exhaust aftertreatment
Stand der TechnikState of the art
Die Erfindung betrifft ein Filterelement zur Reinigung der Abgase einer Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1 und einen Rußfilter mit einem Filterelement nach dem nebengeordneten Anspruch 8. Derartige Filterelemente werden beispielsweise als Rußfilter für Dieselbrennkraftmaschinen eingesetzt .The invention relates to a filter element for cleaning the exhaust gases of an internal combustion engine according to the preamble of claim 1 and a soot filter with a filter element according to the independent claim 8. Such filter elements are used for example as a soot filter for diesel internal combustion engines.
Die Filterelemente bestehen häufig aus einem keramischen Werkstoff und weisen eine Vielzahl von parallel zueinander verlaufenden Eintrittskanalen und Austrittskanalen auf.The filter elements often consist of a ceramic material and have a plurality of mutually parallel inlet channels and outlet channels.
Hergestellt werden Filterelemente aus keramischen Werkstoffen durch Extrudieren. Dies bedeutet, dass der Rohling des Filterelements ein prismatischer Korper mit einer Vielzahl von parallel zueinander verlaufenden Kanälen ist. Die Kanäle eines Rohlings sind zunächst an beiden Enden offen.Filter elements made of ceramic materials are produced by extrusion. This means that the blank of the filter element is a prismatic body with a plurality of mutually parallel channels. The channels of a blank are initially open at both ends.
Damit das zu reinigende Abgas durch die Wände des Filters strömt, wird eine Gruppe von Kanälen am hinteren Ende desSo that the exhaust gas to be cleaned flows through the walls of the filter, a group of channels at the rear end of the
Filterelements verschlossen, wahrend eine andere Gruppe von Kanälen am vorderen Ende des Filterelements verschlossen werden. Dadurch werden zwei Gruppen von Kanälen gebildet, nämlich die sogenannten Eintrittskanale, welche am hinteren Ende verschlossen sind und die sogenannten Austrittskanale, welche am Anfang des Filterelements verschlossen sind.Filter element closed, while another group of channels are closed at the front end of the filter element. As a result, two groups of channels are formed, namely the so-called inlet channels, which are closed at the rear end and the so-called outlet channels, which are closed at the beginning of the filter element.
Zwischen den Eintrittskanalen und den Austrittskanalen besteht nur über die porösen Wände des Filterelements eine Stromungsverbindung, so dass das Abgas das Filterelement nur durchströmen kann, indem es aus den Eintrittskanalen durch die Wände des Filterelements hindurch in die Austrittskanale strömt .Between the inlet channels and the outlet channels there is only a flow connection via the porous walls of the filter element, so that the exhaust gas only filters the filter element can flow through by flowing from the inlet channels through the walls of the filter element into the outlet channel.
Bei herkömmlichen Filterelementen ist es jedoch so, dass sich am hinteren Ende in der Nahe der Langsachse oder Symmetrieachse des Filterelements eine erhöhte Menge von Ruß anlagert, was zum Verstopfen des Filterelements in diesem Bereich fuhrt. Dadurch wird der Stromungswiderstand des Filterelements erhöht und gleichzeitig die Leistungsfähigkeit des Filterelements reduziert .In conventional filter elements, however, it is such that at the rear end in the vicinity of the longitudinal axis or axis of symmetry of the filter element, an increased amount of soot accumulates, which leads to clogging of the filter element in this area. As a result, the flow resistance of the filter element is increased while reducing the performance of the filter element.
Der Erfindung liegt die Aufgabe zugrunde, ein Filterelement und einen Rußfilter bereitzustellen, bei denen die lokale Anhäufung von Rußablagerungen, insbesondere im Inneren des Filterelements vermieden, zumindest jedoch verringert wird.The invention has for its object to provide a filter element and a soot filter, in which the local accumulation of soot deposits, in particular in the interior of the filter element avoided, but at least reduced.
Diese Aufgabe wird bei einem gattungsgemaßen Filterelement dadurch gelost, dass ein Verhältnis zwischen Umfang U und einer Querschnittsflache A der Eintrittskanale bei denThis object is achieved in a generic filter element characterized in that a ratio between the circumference U and a cross-sectional area A of the inlet channel in the
Eintrittskanalen, die innen an dem Filterelement angeordnet sind, großer als bei den außen am Filterelement angeordneten Eintrittskanalen ist.Inlet channels, which are arranged on the inside of the filter element, larger than in the outside of the filter element arranged inlet channels.
Durch die relativ zum Umfang verringerte Querschnittsflache der innen an dem Filterelement angeordneten Eintrittskanale steigt der Stromungswiderstand in diesem inneren Bereich an, was zu einer lokalen Verringerung des Abgasstroms fuhrt. In Folge dessen wird die Temperatur- und Rußbelastung des Filterelements im inneren Bereich reduziert und die weiter außen liegendenDue to the reduced relative to the circumference cross-sectional area of the inside of the filter element arranged inlet channel of the flow resistance increases in this inner region, which leads to a local reduction of the exhaust gas flow. As a result, the temperature and Rußbelastung of the filter element is reduced in the inner region and the farther outward
Bereiche des Filterelements besser ausgelastet. Dadurch können die unerwünschten Rußanhaufungen im Inneren des Filterelements verringert, teilweise jedoch vollständig vermieden werden.Areas of the filter element better utilized. As a result, the unwanted Rußanhaufungen inside the filter element can be reduced, but partially completely avoided.
Eine erfindungsgemaße Ausgestaltung des Filterelements sieht vor, dass die Querschnittsflachen der Eintrittskanale im Inneren des Filterelements geometrisch ahnlich wie die Querschnittsflachen der an der Peripherie des Filterelements angeordneten Eintrittskanale sind und dass die Querschnittsflachen der Eintrittskanale im Inneren des Filterelements kleiner als die Querschnittsflache der an der Peripherie des Filterelements angeordneten Eintrittskanale sind.An embodiment of the filter element according to the invention provides that the cross-sectional areas of the inlet ducts in the interior of the filter element are geometrically similar to the cross-sectional areas of the inlet ducts arranged at the periphery of the filter element and that the cross-sectional areas of the inlet ducts in the interior of the filter Filter element are smaller than the cross-sectional area of the arranged at the periphery of the filter element inlet channels.
Der Einsatz geometrisch ahnlicher Flachen über den gesamtenThe use of geometrically similar surfaces over the whole
Querschnitt des Filterelements kann besonders vorteilhaft sein, wenn das Filterelement zylindrisch und rotationssymmetrisch ausgebildet ist.Cross section of the filter element may be particularly advantageous if the filter element is cylindrical and rotationally symmetrical.
Alternativ ist es auch möglich, dass die Querschnittsflachen der Eintrittskanale im Inneren des Filterelements eine andere Geometrie als die Querschnittsflache der an der Peripherie des Filterelements angeordneten Eintrittskanale aufweist. Dadurch ist der erfindungsgemaße Effekt besser auf einen bestimmten Teilbereich im Inneren des Filterelements fokussierbar . Beispielsweise kann es vorteilhaft sein, wenn der innere Bereich eines erfindungsgemaßen Filterelements so dimensioniert wird, dass seine Abmessungen denen der Zuleitung entsprechen. Dadurch wird erreicht, dass der Teil des Filterelements, der unmittelbar von dem durch die Zuleitung einströmenden Abgas beaufschlagt wird, einen höheren Stromungswiderstand als die weiter außen liegenden Bereiche des Filterlements aufweisen, so dass trotz des anstehenden Staudrucks die Durchstromung des inneren Bereichs des Filterelements gegenüber den außen liegenden Bereichen nicht erhöht ist.Alternatively, it is also possible for the cross-sectional areas of the inlet channels in the interior of the filter element to have a different geometry than the cross-sectional area of the inlet channels arranged at the periphery of the filter element. As a result, the effect according to the invention can be focused better on a specific partial area in the interior of the filter element. For example, it may be advantageous if the inner region of a filter element according to the invention is dimensioned such that its dimensions correspond to those of the feed line. This ensures that the part of the filter element, which is acted upon directly by the inlet flowing through the exhaust gas, have a higher flow resistance than the more outer areas of the Filterlements, so that despite the upcoming dynamic pressure, the flow through the inner region of the filter element relative to the outside areas is not increased.
Die erfindungsgemaße Ausgestaltung der Eintrittskanale ist nicht auf bestimmte Geometrie von Eintrittskanalen beschrankt, sondern ist prinzipiell bei sehr vielen Geometrien von Eintrittskanalen anwendbar. Besonders vorteilhaft ist die Erfindung jedoch bei Eintrittskanalen mit quadratischem, rechteckigem, sechseckigem oder kreuzförmigem Querschnitt.The inventive design of the inlet channels is not limited to certain geometry of inlet channels, but is in principle applicable to many geometries of entrance channels. However, the invention is particularly advantageous in entrance channels with square, rectangular, hexagonal or cross-shaped cross-section.
Es hat sich weiter als vorteilhaft erwiesen, wenn das Filterelement rotationssymmetrisch oder zentralsymmetrisch bezuglich seiner Langsachse ist.It has also proved to be advantageous if the filter element is rotationally symmetrical or centrally symmetrical with respect to its longitudinal axis.
Die eingangs genannten Vorteile können auch mit einem Rußfilter mit einem Filterelement, mit einem Gehäuse, mit einer Zuleitung, mit einer Ableitung, mit einer die Zuleitung mit dem Gehause verbindenden Diffusor und mit einem das Gehäuse mit der Ableitung verbindenden Konus dadurch gelost werden, dass ein erfindungsgemaßes Filterelement eingesetzt wird.The above-mentioned advantages can also with a soot filter with a filter element, with a housing, with a supply line, with a derivative, with a supply line with the Housing connecting diffuser and be solved with a housing connecting the housing with the cone, that a filter element according to the invention is used.
Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Zeichnung, deren Beschreibung und den Patentansprüchen entnehmbar. Alle in der Zeichnung, deren Beschreibung und den Patentansprüchen genannten Vorteile können sowohl einzeln als auch in beliebiger Kombination miteinander erfindungswesentlich sein.Further advantages and advantageous embodiments of the invention are the following drawings, the description and the claims removable. All mentioned in the drawing, the description and the claims benefits may be essential to the invention both individually and in any combination.
Zeichnungendrawings
Es zeigen:Show it:
Figur 1 einen Rußfilter mit einem erfindungsgemaßen1 shows a soot filter with an inventive
Filterelement in einer Seitenansicht, Figur 2 ein Ausfuhrungsbeispiel eines erfindungsgemaßenFilter element in a side view, Figure 2 is an exemplary embodiment of an inventive
Filterelements in einer Ansicht von vorne und Figur 3 ein Ausschnitt eines Querschnitts durch ein weiteres erfindungsgemaßes Filterelement.Filter element in a view from the front and Figure 3 shows a section of a cross section through another inventive filter element.
Beschreibung der AusfuhrungsbeispieleDescription of the exemplary embodiments
Figur 1 stellt einen Rußfilter 1 mit einer Zuleitung 3, einem Diffusor 5, einem Gehäuse 7 und einem erfindungsgemaßen Filterelement 9 in einer teilweise geschnittenen Seitenansicht dar .Figure 1 illustrates a soot filter 1 with a feed line 3, a diffuser 5, a housing 7 and a filter element 9 according to the invention in a partially sectioned side view.
Durchströmt wird der Rußfilter 1 in Richtung der Pfeile 11. An das Gehäuse 7 schließen ein Konus 13 und eine Ableitung 15 an. Das Filterelement 9 ist gasdicht mit dem Gehäuse verbunden, so dass das durch die Zuleitung 3 zustromende Abgas (nicht dargestellt) durch das Filterelement 9 hindurchstromen muss.The soot filter 1 flows through in the direction of the arrows 11. The housing 7 is adjoined by a cone 13 and a discharge line 15. The filter element 9 is gas-tightly connected to the housing so that the exhaust gas (not shown) flowing through the supply line 3 has to flow through the filter element 9.
Das Filterelement 9 weist eine Eintrittsflache 17 und eine Austrittsflache 19 auf. Das Filterelement 19 ist von einer Vielzahl von Kanälen durchzogen, die sich von der Eintrittsflache 17 bis zur Austrittsflache 19 erstrecken. Damit das Abgas durch die Wände (ohne Bezugszeichen) des Filterelements 9 strömen muss, sind die Eintrittskanale 21 an der Eintrittsflache 17 offen und an der Austrittsflache 19 verschlossen. Die sogenannten Austrittskanale 23 sind an der Eintrittsflache 17 verschlossen und an der Austrittsflache 19 offen. Die Verschlusse der Eintrittskanale 21 und der Austrittskanale 23 sind in Figur 1 als schwarze Flachen ohne Bezugszeichen dargestellt.The filter element 9 has an inlet surface 17 and an outlet surface 19. The filter element 19 is crossed by a plurality of channels which extend from the inlet surface 17 to the outlet surface 19. In order for the exhaust gas to flow through the walls (without reference numeral) of the filter element 9, the inlet channels 21 are open at the inlet surface 17 and closed at the outlet surface 19. The so-called outlet channels 23 are closed at the inlet surface 17 and open at the outlet surface 19. The closures of the inlet channel 21 and the outlet channel 23 are shown in Figure 1 as black areas without reference numerals.
Das in Figur 1 in einem Teilschnitt dargestellte Muster von jeweils einem Eintrittskanal 21, der sich mit einem Austritts¬ kanal 23 abwechselt, setzt sich über die gesamte Querschnitts¬ flache des Filterelements in an sich bekannter Weise fort.The pattern of each of an inlet channel 21 illustrated in Figure 1 in a partial section, the alternating with an egress ¬ channel 23, continues through the entire cross-section of the filter element ¬ flat continued in known manner.
Figur 2 zeigt einen Querschnitt durch ein Ausfuhrungsbeispiel eines erfindungsgemaßen Filterelements 9.FIG. 2 shows a cross section through an exemplary embodiment of a filter element 9 according to the invention.
In Figur 2 ist ein Querschnitt durch ein erstes Ausfuhrungsbeispiel eines erfindungsgemaßen Filterelements 9 mit quadratischem Querschnitt dargestellt. Dabei wechseln sich, wie bei keramischen Filterelementen üblich, Eintrittskanale 21 und Austrittskanale 23 ab. Aus Gründen der Übersichtlichkeit sind nicht alle der Kanäle mit Bezugszeichen versehen. Die Eintrittskanale 21 und die Austrittskanale 23 haben bei dem in Figur 2 dargestellten Ausfuhrungsbeispiel die Form eines Quadrats .FIG. 2 shows a cross section through a first exemplary embodiment of a filter element 9 according to the invention with a square cross section. In this case, as is usual with ceramic filter elements, inlet channels 21 and outlet channels 23 alternate. For reasons of clarity, not all of the channels are provided with reference numerals. The inlet channel 21 and the outlet channel 23 have the shape of a square in the exemplary embodiment shown in FIG.
Dabei ist zu beachten, dass die im Inneren des Filterelements 9 angeordneten Eintrittskanale und Austrittskanale 23 einen quadratischen Querschnitt mit der Kantenlange B aufweisen. Die weiter außen angeordneten Eintrittskanale 21 und die weiter außen angeordneten Austrittskanale 23 weisen einen quadratischen Querschnitt mit der Kantenlange 2B auf.It should be noted that arranged in the interior of the filter element 9 inlet channel and outlet channels 23 have a square cross-section with the edge length B. The inlet channels 21 arranged further outward and the outlet channels 23 arranged further outside have a square cross-section with the edge length 2B.
Dies bedeutet, dass bei den inneren Eintrittskanalen 21 mit der Kantenlange B das Verhältnis A/U von Umfang U zur Querschnittsflache A gleich 4 : B ist.This means that in the case of the inner inlet channels 21 with the edge length B, the ratio A / U of the circumference U to the cross-sectional area A equals 4: B.
Bei den außen angeordneten Eintrittskanalen 21, deren Querschnittsflache eine Kantenlange von 2B aufweist, ist das Verhältnis U/A lediglich 2 : B. Daraus wird deutlich, dass durch die Verkleinerung der Kantenlange der Querschnittsflachen im Inneren des Filterelements 9 das Verhältnis zwischen Umfang und Querschnittsflache der Eintrittskanale gegenüber den außen liegenden Austrittskanalen 21 vergrößert wurde. Im vorliegenden Fall hat sich das Verhältnis sogar verdoppelt.In the case of the outer inlet channels 21, whose cross-sectional area has an edge length of 2B, this is Ratio U / A only 2: B. It is clear that the reduction of the edge length of the cross-sectional areas in the interior of the filter element 9, the ratio between the circumference and cross-sectional area of the inlet channel compared to the outer outlet channels 21 was increased. In the present case, the ratio has even doubled.
Dieser Effekt fuhrt dazu, dass der Stromungswiderstand der innen liegenden Eintrittskanale erhöht wird, so dass weniger Abgase in die inneren Eintrittskanale gelangen und entsprechend die äußeren Eintrittskanale mit mehr Abgas beaufschlagt werden. Dadurch findet eine Vergleichmaßigung der Beaufschlagung der Eintrittskanale 21 über den gesamten Querschnitt des Filterelements 9 statt.This effect leads to the fact that the flow resistance of the inner inlet channels is increased, so that fewer exhaust gases reach the inner inlet channels and correspondingly the outer inlet channels are supplied with more exhaust gas. As a result, a comparison of the admission of the inlet channel 21 over the entire cross section of the filter element 9 takes place.
In Figur 3 ist ein zweites Ausfuhrungsbeispiel eines erfindungsgemaßen Filterelements im Teilschnitt dargestellt. Dargestellt ist lediglich der innere Bereich des Filterelements. Bei diesem Ausfuhrungsbeispiel haben die Eintrittskanale 21 die Form eines Kreuzes. Zur Verdeutlichung und Veranschaulichung ist in Figur 3 eines dieser kreuzförmigen Querschnittsflachen schraffiert dargestellt. Die zugehörigen Austrittskanale 23 weisen einen quadratischen Querschnitt auf. Anhand dieses Ausfuhrungsbeispiels wird deutlich, dass das erfindungsgemaße Konzept auch dann anwendbar ist, wenn dieFIG. 3 shows a partial embodiment of a second exemplary embodiment of a filter element according to the invention. Shown is only the inner region of the filter element. In this embodiment, the inlet channels 21 have the shape of a cross. For clarification and illustration, one of these cross-shaped cross-sectional areas is shown hatched in FIG. The associated outlet channels 23 have a square cross-section. On the basis of this exemplary embodiment, it is clear that the inventive concept is also applicable if the
Eintrittskanale 21 und die Austrittskanale 23 unterschiedliche Geometrien aufweisen. Bei der in Figur 3 dargestellten kreuzförmigen Geometrie der Eintrittskanale 21 ist das Verhältnis zwischen Umfang U und der Querschnittsflache A der Eintrittskanale gegenüber dem Beispiel gemäß Figur 2 nochmals deutlich erhöht, so dass bei dieser Geometrie die Anhäufung von Ruß in der Mitte des Filterelements noch weitgehender unterdruckt wird.Inlet channel 21 and the outlet channel 23 have different geometries. In the cross-shaped geometry of the inlet channel 21 shown in FIG. 3, the ratio between the circumference U and the cross-sectional area A of the inlet channel is again significantly increased compared with the example according to FIG. 2, so that in this geometry the accumulation of soot in the middle of the filter element is even more strongly suppressed becomes.
Die nicht dargestellten Außenbereiche dieses Filterelements 9 können wie bei dem ersten Ausfuhrungsbeispiel mit quadratischen Querschnitten sowohl der Eintrittskanale 21 als auch der Austrittskanale 23 ausgeführt sein. The outer regions, not shown, of this filter element 9 can be designed, as in the first exemplary embodiment, with square cross sections of both the inlet channels 21 and the outlet channels 23.

Claims

Ansprüche claims
1. Filterelement zur Filterung von Russ, insbesondere zur Filterung von Abgasen einer Dieselbrennkraftmaschine, mit einer parallel zur Hauptstromungsrichtung des Abgases verlaufenden Langsachse (15), mit einer Vielzahl von parallel zur Langsachse (15) verlaufenden Einlasskanalen (21), und mit einer Vielzahl von parallel zur Langsachse (25) verlaufenden Auslasskanalen (23), wobei die Einlasskanale (21) an einer Eintrittsflache (17) des Filterelements (9) beginnen und an einer Austrittsflache (19) des Filterelements (9) verschlossen sind, und wobei die Auslasskanale (23) an der Eintrittsflache (17) verschlossen sind und an der Austrittsflache (19) enden, dadurch gekennzeichnet, dass ein Verhältnis (U/A) zwischenFilter element for filtering soot, in particular for filtering exhaust gases of a diesel internal combustion engine, with a parallel to the main flow direction of the exhaust gas extending longitudinal axis (15), with a plurality of parallel to the longitudinal axis (15) extending inlet channels (21), and with a plurality of parallel to the longitudinal axis (25) extending outlet channels (23), wherein the inlet channels (21) on an inlet surface (17) of the filter element (9) begin and on an outlet surface (19) of the filter element (9) are closed, and wherein the outlet channels ( 23) are closed at the inlet surface (17) and terminate at the outlet surface (19), characterized in that a ratio (U / A) between
Umfang (U) und einer Querschnittsflache (A) der Eintrittskanale (21) , bei den Eintrittskanalen (21) , die innen an dem Filterelement (9) angeordnet sind, großer als bei den außen am Filterelement (9) angeordneten Eintrittskanale (21) ist.Circumference (U) and a cross-sectional area (A) of the inlet channel (21) in the inlet channels (21), which are arranged on the inside of the filter element (9), greater than in the outside of the filter element (9) arranged inlet channel (21) ,
2. Filterelement nach Anspruch 1, dadurch gekennzeichnet, dass die Querschnittsflache der Eintrittskanale (21) im Inneren des Filterelements (9) geometrisch ahnlich wie die Querschnittsflache der an der Peripherie des Filterelements (9) angeordneten Eintrittskanale (21) ist, und dass die2. Filter element according to claim 1, characterized in that the cross-sectional area of the inlet channel (21) in the interior of the filter element (9) geometrically similar to the cross-sectional area of the at the periphery of the filter element (9) arranged inlet channels (21), and that the
Querschnittsflache der Eintrittskanale (21) im Inneren des Filterelements (9) kleiner sind als die Querschnittsflache der an der Peripherie des Filterelements (9) angeordneten Eintrittskanale (21) ist.Cross-sectional area of the inlet channel (21) in the interior of the filter element (9) are smaller than the cross-sectional area of the at the periphery of the filter element (9) arranged inlet channel (21).
3. Filterelement nach Anspruch 1, dadurch gekennzeichnet, dass die Querschnittsflache der Eintrittskanale (21) im Inneren des Filterelements (9) eine andere Geometrie als die Querschnittsflache der an der Peripherie des Filterelements (9) angeordneten Eintrittskanale (21) hat. 3. Filter element according to claim 1, characterized in that the cross-sectional area of the inlet channel (21) in the interior of the filter element (9) has a different geometry than the cross-sectional area of the at the periphery of the filter element (9) arranged inlet channels (21).
4. Filterelement nach Anspruch 3, dadurch gekennzeichnet, dass die Querschnittsflache der Eintrittskanale (21) mit abnehmendem Abstand (R) zur Langsachse (25) des Filterelements (9) monoton abnimmt .4. Filter element according to claim 3, characterized in that the cross-sectional area of the inlet channel (21) decreases monotonically with decreasing distance (R) to the longitudinal axis (25) of the filter element (9).
5. Filterelement nach Anspruch 3, dadurch gekennzeichnet, dass die Querschnittsflache der Kanäle (21, 23, 27) mit abnehmendem Abstand (R) zur Langsachse (25) des Filterelements (9) in einer oder mehreren Stufen abnimmt.5. Filter element according to claim 3, characterized in that the cross-sectional area of the channels (21, 23, 27) decreases with decreasing distance (R) to the longitudinal axis (25) of the filter element (9) in one or more stages.
6. Filterelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Querschnittsflache der Eintrittskanale (21) die Form eines Quadrats, eines Sechsecks oder eines Rechtecks aufweisen.6. Filter element according to one of the preceding claims, characterized in that the cross-sectional area of the inlet channels (21) have the shape of a square, a hexagon or a rectangle.
7. Filterelement nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Querschnittsflache der im Inneren des Filterelements (9) angeordneten Eintrittskanale (21) die Form eines Kreuzes aufweisen.7. Filter element according to one of claims 1 to 5, characterized in that the cross-sectional area of the inside of the filter element (9) arranged inlet channels (21) have the shape of a cross.
8. Filterelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Filterelement (9) rotationssymmetrisch oder zentralsymmetrisch bezuglich seiner Langsachse (25) ist.8. Filter element according to one of the preceding claims, characterized in that the filter element (9) is rotationally symmetrical or centrally symmetrical with respect to its longitudinal axis (25).
9. Rußfilter mit einem Filterelement (9), mit einem Gehäuse (7), mit einer Zuleitung (3) und mit einer Ableitung (15), dadurch gekennzeichnet, dass das Filterelement ein Filterelement (9) nach einem der vorhergehenden Ansprüche ist. 9. Rußfilter with a filter element (9), with a housing (7), with a feed line (3) and with a derivative (15), characterized in that the filter element is a filter element (9) according to one of the preceding claims.
PCT/EP2006/067179 2005-11-18 2006-10-09 Filter element and filter for exhaust-gas aftertreatment WO2007057256A1 (en)

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DE102005055073A DE102005055073A1 (en) 2005-11-18 2005-11-18 Filter element and filter for exhaust aftertreatment

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1384507A2 (en) * 2001-05-02 2004-01-28 Ngk Insulators, Ltd. HONEYCOMB STRUCTURAL BODY, AND HONEYCOMB FILTER AND CONVERTER SYSTEM USING THE HONEYCOMB STRUCTURAL BODY
EP1484483A1 (en) * 2002-02-26 2004-12-08 Ngk Insulators, Ltd. Honeycomb filter
EP1541817A1 (en) * 2003-06-05 2005-06-15 Ibiden Co., Ltd. Honeycomb structure body

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1384507A2 (en) * 2001-05-02 2004-01-28 Ngk Insulators, Ltd. HONEYCOMB STRUCTURAL BODY, AND HONEYCOMB FILTER AND CONVERTER SYSTEM USING THE HONEYCOMB STRUCTURAL BODY
EP1484483A1 (en) * 2002-02-26 2004-12-08 Ngk Insulators, Ltd. Honeycomb filter
EP1541817A1 (en) * 2003-06-05 2005-06-15 Ibiden Co., Ltd. Honeycomb structure body

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