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WO2008025599A1 - Élément filtrant pour filtre à particules et procédé de production d'un élément filtrant - Google Patents

Élément filtrant pour filtre à particules et procédé de production d'un élément filtrant Download PDF

Info

Publication number
WO2008025599A1
WO2008025599A1 PCT/EP2007/056924 EP2007056924W WO2008025599A1 WO 2008025599 A1 WO2008025599 A1 WO 2008025599A1 EP 2007056924 W EP2007056924 W EP 2007056924W WO 2008025599 A1 WO2008025599 A1 WO 2008025599A1
Authority
WO
WIPO (PCT)
Prior art keywords
channels
filter element
outlet
filter
inlet
Prior art date
Application number
PCT/EP2007/056924
Other languages
German (de)
English (en)
Inventor
Joachim Frangen
Ruediger Herr
Juergen Goetz
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 WO2008025599A1 publication Critical patent/WO2008025599A1/fr

Links

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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/002—Producing shaped prefabricated articles from the material assembled from preformed elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/003—Apparatus or processes for treating or working the shaped or preshaped articles the shaping of preshaped articles, e.g. by bending
    • B28B11/006—Making hollow articles or partly closed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/30—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for treatment of exhaust gases from IC Engines
    • 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
    • F01N2330/14—Sintered material
    • 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

Definitions

  • the invention relates to a soot particle filter according to the preamble of the independent claims 1 and 4.
  • the filter elements are made of a ceramic material, this is usually done by extrusion.
  • the filter body is initially a prismatic structure with a plurality of mutually parallel channels. So that the exhaust gas is forced through the filter walls located between the channels, the so-called inlet channels are closed at the outlet surface of the filter body, while the outlet channels are closed at the inlet surface of the filter body. The closing of the inlet channels takes place after the extrusion.
  • the inlet and outlet channels are closed by sealing plugs made of the same or a similar ceramic material from which the filter body was also extruded. These plugs are pressed into the respective channels. As a filter element partially several hundred channels are present and all channels are closed at one end by a plug, therefore, several hundred plugs must be introduced into the channels. This method is naturally very time-consuming and thus cost-intensive. It also contains a large error rate. Disclosure of the invention
  • the invention is based on the object to provide a method for producing a filter element, which works more effectively and cost-effectively and also with a lower error rate than the conventional method for producing a filter element.
  • the invention is based on the object to provide a filter element whose hydraulic properties are improved and in which the filter performance is increased over conventional filter elements.
  • a filter element in particular for filtering exhaust gases of a diesel internal combustion engine, with an inlet surface and an outlet surface, with inlet channels and with outlet channels, wherein the inlet channels begin at the inlet surface and are closed at the outlet surface, wherein the outlet channels are closed at the entrance surface and terminate at the exit surface, and wherein the inlet channels and the outlet channels are separated by filter walls of an open-pored material by the following method steps.
  • closure disk which is designed so that it closes the outlet channels or the inlet channels at the inlet surface or at the outlet surface of the filter body, it is possible by placing only one closure disc on the entry surface and a closure disc on the exit surface all channels in the right way to close. This results in a very high time savings when closing the channels and also reduces the reject rate when closing the channels.
  • first or the second closure disk for manufacturing reasons or other reasons must be made so thin that they can not withstand the prevailing pressures and temperatures during operation, can according to the invention several layers of Closing discs are placed on both the entrance surface and on the exit surface. As a result, the required strength can be achieved and it results in a better connection between the filter walls or the inlet and the outlet surfaces of the filter body and the closure discs.
  • the filter element composed of filter body and closure disks is subjected to a heat treatment after drying, in particular by sintering.
  • the inventive task is also in a filter element with a mecanicsfiumblee and with an exit surface, with inlet channels and outlet channels, wherein the inlet channels begin at the entrance surface and are closed at the Austrittsfikiee, the outlet channels are closed at the mecanicsfikiee and terminate at the exit surface, and wherein the inlet channels and the outlet channels are separated by filter walls from an open-pored material, achieved in that at least one closure disc is present at the entrance surface and / or the outlet surface, and that the closure disc serves to close the inlet channels and / or the outlet channels.
  • the filter element according to the invention consisting of the filter body and the closure disks, is much easier to handle in terms of production technology than conventional filter elements and has a lower error rate.
  • the at least one closure disk has openings at the entrance surface where the inlet channels begin and that the at least one closure disk has openings at the outlet opening where the outlet channels terminate.
  • Figure 1 is a schematic representation of an internal combustion engine with an exhaust aftertreatment device according to the invention
  • Figure 2 shows a filter element in longitudinal section
  • Figure 3 shows an exemplary embodiment of an inventive filter element.
  • an internal combustion engine carries the reference numeral 10.
  • the exhaust gases are discharged via an exhaust pipe 12, in which a filter device 14 is arranged. With this, soot particles are filtered out of the exhaust gas flowing in the exhaust pipe 12. This is particularly necessary in diesel internal combustion engines to comply with legal requirements.
  • the filter device 14 comprises a cylindrical housing 16, in which a rotationally symmetrical in the present embodiment, a total also cylindrical filter element 18 is arranged. Between the housing 16 and the filter element 18 is a mat (see reference numeral 38 in Figure 3) is provided, which serves to attach the filter element 18 in the housing and at the same time prevents exhaust gases flowing through the annular gap between the housing 16 and the filter element 18.
  • FIG. 2 shows a cross section through a filter element 18 according to the prior art.
  • the filter element 18 may, for example, be produced as an extruded shaped body of a ceramic material, such as cordierite.
  • the filter element 18 is flowed through in the direction of the arrows 20 of not shown exhaust gas.
  • An entrance surface has the reference numeral 22 in FIG. 2, while an exit surface in FIG. 2 has the reference numeral 24.
  • inlet channels 28 Parallel to a longitudinal axis 26 of the filter element 18 extend a plurality of inlet channels 28 in alternation with outlet channels 30.
  • the inlet channels 28 are closed at the outlet surface 24.
  • the sealing plugs are shown in FIG. 2 without reference numerals.
  • the outlet channels 30 are open at the outlet surface 24 and closed in the region of the inlet surface 22.
  • the flow path of the unpurified exhaust gas thus leads into one of the inlet channels 28 and from there through a filter wall 31 into one of the outlet channels 30. This is illustrated by arrows 32 by way of example.
  • the surface 24 becomes the inflow surface and the surface 22 becomes the exit surface.
  • the channels 28 become outlet channels, while the channels 30 become inlet channels.
  • the reversal of the flow direction of the exhaust gas can be achieved by changing the mounting position of the filter element 18 in the housing 16 in the simplest way. In the embodiments described below, for the sake of clarity, only one direction of flow and consequently a function of the channels 28 and 30 are assumed, although the function of the channels 28 and 30 can also be changed by turning the filter element 18 in the housing 16.
  • FIG. 3 shows an exemplary embodiment of a filter element 18 according to the invention.
  • a second shutter plate 34 according to the invention is shown in a front view.
  • the second shutter disk 34 has the shape shown in the right part of Figure 3.
  • the hatched areas 38 consist of the same Material as the filter body 36. Between the closure surfaces 38 openings 40 are recessed.
  • the second closure plate 34 is then placed on the filter body 36 such that the closure surfaces 38 close the inlet channels 28 at the outlet surface 24 and the openings 40 release the outlet channels 30 at the outlet surface 24.
  • a first closure plate 42 disposed on the entrance surface 22 seals the exit channels 30 while having openings 40 at the beginning of the entrance channels 28.
  • first closure plate 42 and the second closure plate 34 are formed as a separate molded part, it is possible by the placement of only a first closure plate 22 and a second closure plate 24, the filter body 36 so that the inlet channels 28 are closed at the exit surface 24 and the exit channels 30 are closed at the entrance surface 22. This results in a considerable acceleration of the production process. The erroneous closing of channels becomes almost impossible.
  • the effective filter area of the filter body 36 is not shortened. This results in the same length of the filter body 36, a larger filter area and thus a more efficient filter element 18. Since the thickness of the closure discs 42 and 24 is also smaller than the length of the sealing plug, which are usually inserted into the channels 28 and 30, is can also be the total length of the filter element 18, consisting of filter body 36 and shutter disks 42 and 34, can be reduced.
  • closure disks 42 and 34 The placement of the closure disks 42 and 34 on the filter body 36 takes place when both the filter body 36 and the closure disks 42 and 34 are still wet, so that the closure disks 42 and 34 connect to the filter body 36 during the subsequent drying operation.
  • This compound is made by a subsequent heat treatment, such as sintering, further strengthened, so that the result is a very stable connection between the closure disks 42 and 34 and filter body 36 results.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Filtering Materials (AREA)

Abstract

L'invention concerne un procédé permettant d'améliorer facilement les corps filtrants (36) d'éléments filtrants de façon à obtenir un élément filtrant à canaux d'entrée (28) et canaux de sortie (30), ce procédé consistant à placer une première rondelle d'obturation (42) et une seconde rondelle d'obturation (34) sur le corps filtrant.
PCT/EP2007/056924 2006-08-30 2007-07-09 Élément filtrant pour filtre à particules et procédé de production d'un élément filtrant WO2008025599A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006040643.5 2006-08-30
DE200610040643 DE102006040643A1 (de) 2006-08-30 2006-08-30 Filterelement für einen Rußpartikelfilter und Verfahren zur Herstellung eines Filterelements

Publications (1)

Publication Number Publication Date
WO2008025599A1 true WO2008025599A1 (fr) 2008-03-06

Family

ID=38535279

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/056924 WO2008025599A1 (fr) 2006-08-30 2007-07-09 Élément filtrant pour filtre à particules et procédé de production d'un élément filtrant

Country Status (2)

Country Link
DE (1) DE102006040643A1 (fr)
WO (1) WO2008025599A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1375849A2 (fr) * 2002-06-17 2004-01-02 Hitachi Metals, Ltd. Filtre en nid d'abeilles en céramique
EP1541233A1 (fr) * 2003-12-11 2005-06-15 Ngk Insulators, Ltd. Structure en nid d'abeilles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1375849A2 (fr) * 2002-06-17 2004-01-02 Hitachi Metals, Ltd. Filtre en nid d'abeilles en céramique
EP1541233A1 (fr) * 2003-12-11 2005-06-15 Ngk Insulators, Ltd. Structure en nid d'abeilles

Also Published As

Publication number Publication date
DE102006040643A1 (de) 2008-03-20

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