WO2016173849A1 - Device for filtering air - Google Patents

Device for filtering air Download PDF

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Publication number
WO2016173849A1
WO2016173849A1 PCT/EP2016/058171 EP2016058171W WO2016173849A1 WO 2016173849 A1 WO2016173849 A1 WO 2016173849A1 EP 2016058171 W EP2016058171 W EP 2016058171W WO 2016173849 A1 WO2016173849 A1 WO 2016173849A1
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WO
WIPO (PCT)
Prior art keywords
air
filter
partition
sealing
filter element
Prior art date
Application number
PCT/EP2016/058171
Other languages
German (de)
French (fr)
Inventor
Toralf Noack
Original Assignee
Deutsche Bahn Ag
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 Deutsche Bahn Ag filed Critical Deutsche Bahn Ag
Publication of WO2016173849A1 publication Critical patent/WO2016173849A1/en

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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
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
    • 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
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
    • B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2271/00—Sealings for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2271/02—Gaskets, sealings

Definitions

  • Apparatus for filtering air comprising a filter housing having a Rohluft- and a clean air area, wherein raw and clean air area separated by a partition against each other, and at least one filter element by means of a head portion with at least one introduced in the partition opening for the passage of an air flow from Rohluft- in the clean air area is connectable, wherein in the contact area between the head portion and the partition a seal with sealing ribs is performed.
  • the air drawn in to operate internal combustion engines from the environment must not contain impurities exceeding a certain grain size, as this would cause increased wear and damage to sensitive engine components. Therefore, the air must be filtered before being fed to the combustion engine.
  • the filter elements used for this purpose are often designed as pocket filters. Under normal operating conditions, such as in asphalted road vehicles, the ambient air is usually released in a satisfactory and sufficient manner by means of a arranged in the air supply to the engine pleated paper filter from dirt particles that are carried in the intake air flow. As the operating time increases, more and more dirt particles accumulate on the filter paper. The flow resistance increases thereby and the access of air is made more difficult. In simple filter constructions, in such a case the condition-oriented replacement of the air filter is the simplest and most cost-effective solution.
  • WO 2000/074818 A1 discloses an air filter arrangement which has a first filter stage to be flowed through by the intake air with a V-shaped arrangement of two filter plates and a second filter stage for fine filtering of the air. Both filter stages are separated from each other by a partition wall of the filter housing. In this partition, an opening for the passage of air from the first filter stage is provided in the second filter stage.
  • V-filter pack The air outlet end of the V-shaped arrangement of two filter plates of the first filter stage, referred to as a "V-filter pack", has a sealing ring to improve tightness at the air outlet end of the V-filter pack two additional metal stop strips are provided parallel to the edges of the opening in the
  • the mounting height of the sealing ring in the unassembled state exceeds the overall height of the two stop strips by means of a holding or lifting mechanism, the V-filter pack can be raised against the dividing wall of the filter housing against the two stop strips, so that the sealing ring is compressed.
  • the invention is therefore based on the object to provide a device for filtering air, which comprises a filter housing with a Rohluft- and a clean air area, the raw and clean air area are separated by a partition against each other, and at least one filter element comprises by means of a head portion with at least one opening introduced in the partition wall for the passage of an air flow from the raw air into the clean air area is connectable, wherein in the contact area between the head portion and the partition wall, a seal is designed with sealing ribs, which has a relation to theticiankann-
  • the prior art improved sealing between raw air and clean air area allows.
  • this object is achieved in conjunction with the preamble of patent claim 1, characterized in that an additional device for applying a formed between two sealing ribs gap is provided with compressed air, by means of the addition of a constant supply of sealing air, an additional compressed air pulse can be generated.
  • the sealing air is under pressure compared to raw and clean air and is supplied to the partition via a connection. Even in the event of possible leaks, the passage of raw or clean air into the respectively adjacent area of the air filter is avoided since the raw or clean air would first have to overcome the blocking air for this purpose.
  • the use of sealing air thus achieves a reliable separation between raw and clean air.
  • the sealing air can be removed from the clean air area of the air filter.
  • the operability of the seal can be checked. As soon as the pressure level of the sealing air drops, there must be a leak that allows escape of blocking air from the space between the sealing ribs.
  • the invention now provides for the generation of additional blocking air pressure pulses, which superimpose the conventional pressure level of the sealing air at certain intervals or at certain times and initiate a blast of compressed air in the space between the sealing ribs.
  • the sealing ribs are made so flexible that they can be moved outward or away from one another by the compressed-air impact (ie, the gap between the sealing ribs increases). In this way, the sealing ribs can be realigned by the targeted injection of a compressed air pulse. This is advantageous, for example, when the sealing ribs have either been installed or twisted when inserting the filter element into the filter housing or only later by the action of environmental conditions such as vibrations or smaller temperature-induced length or position changes. In this way, the optimal sealing effect can be restored.
  • the invention provides for synchronizing the sealing air supply with the cleaning process in such a way that whenever compressed air is blown into the pocket-shaped filter sections in the return flow direction, the device for pressurizing the intermediate space with sealing air generates an additional compressed-air pulse and introduces the space between the sealing ribs.
  • the vibration of the filter element during cleaning is used to align the sealing ribs.
  • the sealing effect is reliably maintained even during long periods of operation or under unfavorable environmental conditions (eg vibrations etc.) and effectively reduces the need for corrective intervention by operating personnel.
  • the device has at least one rail for pressing and frictionally holding the head portion of the filter element against the partition wall.
  • an encircling flange may be provided on the head section of the filter element in an advantageous manner, on the surface of the raw air side of which the rail rests.
  • Such attachment ensures a longitudinal extension of the filter element at high ambient temperature changes. Temperature-induced changes in length of the filter element are therefore not hindered by screws, bolts or the like, which fix the filter element directly against the partition. Instead, a creep of the filter element under the rail is possible. This is of particular importance, since the filter elements are often made of materials that are subject to a strong temperature-induced change in length. Especially with air filters in the intake ports of internal combustion engines in locomotives, construction machinery, mining equipment or tanks this is an important aspect for the serviceability of inventive air filter devices.
  • the at least one rail is designed as a sword guide.
  • a sword according to the invention has a central contact area which covers the entire length of the filter element plus its possible temperature-induced longitudinal expansions.
  • the sword has in each case a fastening region in which the sword can be fixed by means of screws or hooks against the dividing wall of the filter housing. By appropriate tightening of the screws, the contact area of the sword exerts a pressing action against the back side of the head portion of the filter element on the raw air side and holds it against the dividing wall exclusively by force fit.
  • the invention further proposes that the head section of the filter element has at least one centering element for aligning the filter element with respect to the dividing wall.
  • a centering element facilitates the correct alignment and assembly of the filter element in a device according to the invention.
  • the invention also includes a drive system and a rail vehicle, each with an inventively designed device for filtering air.
  • Figure 1 device for air filtration
  • FIG 3 Detail view of the attachment of the pocket filter to the partition Figure 4: Centering of the pocket filter Figure 1 shows an inventive device for air filtration, which is integrated into the roof structure of a diesel locomotive.
  • air filters are used to clean the air sucked from the environment before it is supplied to the internal combustion engine.
  • the air intake and the discharge of air to the internal combustion engine correspond to the prior art and are therefore not shown in detail.
  • the air filter device consists essentially of a raw air chamber and a clean air chamber, which are separated by a partition wall (2) against each other.
  • a plurality of load filter inserts is installed, which are designed as a pocket filter (4).
  • Each pocket filter comprises three filter sections made of pleated filter material.
  • the filter sections are potted at one end with an end plate to a common head portion (8).
  • the head section (8) has a separate passage opening for each filter section, which allows the passage of air from the interior of the filter section to the outside.
  • the partition (2) has a number of pocket filters (4) corresponding plurality of through holes (12), which allow the passage of an air flow from the raw air chamber or the pocket filters (4) in the clean air chamber.
  • the pocket filters (4) are fastened to the unfiltered air side of the dividing wall (2) in such a way that a pocket filter (4) is in each case connected to a passage opening (12).
  • the partition (2) has an inner cavity (13) (better seen in Figure 2).
  • This cavity (13) by means of an air supply (1) can be acted upon with compressed air, not only constant sealing air is supplied, but by means of a not shown in Figure 1, to the air supply (1) pneumatically connected device at intervals additional the sealing air supply superimposed Compressed air pulses generated and introduced into the cavity (13).
  • the pocket filters (4) are each sealed at their head sections (8) by means of a seal (3) on the raw air side with respect to the dividing wall (2).
  • FIG. 2 shows the detail "A" of FIG. 1 enlarged.
  • the seal (3) by means of which the pocket filters (4) are sealed at their head sections (8) to the dividing wall (2), comprises two sealing ribs (9, 10 Both sealing ribs (9, 10) are so flexible in terms of material and dimensioning that they are movable away from one another when the intermediate space (11) is acted upon by compressed air, in particular as soon as The intermediate space (1 1) communicates with the cavity (13) of the dividing wall (2), for example by means of a bore
  • the arrow indicated in FIG. 2 symbolizes the inflow of compressed air into the gap (1 1) of the seal (3), which by means of a device in the form of a constant sealing air and the sealing air at intervals superimposed pulses generated and the Heilzufu hr (1) (not visible in FIG.
  • the attachment of the pocket filter (4) on the partition wall (2) is shown.
  • the head section (8) of the pocket filter (4) has a circumferential flange.
  • the two fastening tabs (5) are aligned with each other and with respect to the pocket filter (4) such that a relative movement of the pocket filter (4) with respect to the fastening tabs (5) is possible. Since the head portion (8) and the partition wall (2) are made of materials having different coefficients of thermal expansion, both components can move relative to each other without damaging or canceling the fixation of the pocket filter (4) to the partition wall (2).
  • FIG. 4 shows the centering of the filter elements or pocket filters (4) with respect to FIG the partition (2) shown.
  • each head section (8) of a pocket filter (4) has one or more centering cams (6).
  • the dividing wall (2) has a receiving element (7) bridging the passage opening (12). If the pocket filter (4) is held on the dividing wall (2) by means of the fastening tab (5) shown in FIG. 3, the receiving element (7) must of course also be held on the dividing wall (2) in an analogous manner (not in FIG shown).

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

The invention relates to a device for filtering air, comprising a filter housing with an unfiltered air region and a filtered air region, said unfiltered and filtered air regions being separated from each other by a partition (2), and at least one filter element (4) which can be connected to at least one opening introduced into the partition (2) by means of a head portion (8) for the passage of an air flow from the unfiltered air region into the filtered air region, wherein a seal (3) with sealing ribs (9, 10) is formed in the contact region between the head portion (8) and the partition (2). The device is to allow a better seal between the unfiltered air region and the filtered air region. This is achieved in that an additional device is provided for supplying compressed air to an intermediate chamber (11) formed between two sealing ribs (9, 10), an additional compressed air pulse being producible by means of said device together with a constant supply of sealing air.

Description

Vorrichtung zum Filtern von Luft  Device for filtering air
Vorrichtung zum Filtern von Luft, umfassend ein Filtergehäuse mit einem Rohluft- und einem Reinluftbereich, wobei Roh- und Reinluftbereich durch eine Trennwand gegeneinander abgetrennt sind, sowie mindestens ein Filterelement, das mittels eines Kopfabschnittes mit mindestens einer in der Trennwand eingebrachten Öffnung zum Durchtritt eines Luftstromes vom Rohluft- in den Reinluftbereich verbindbar ist, wobei im Kontaktbereich zwischen Kopfabschnitt und Trennwand eine Dichtung mit Dichtrippen ausgeführt ist. Apparatus for filtering air, comprising a filter housing having a Rohluft- and a clean air area, wherein raw and clean air area separated by a partition against each other, and at least one filter element by means of a head portion with at least one introduced in the partition opening for the passage of an air flow from Rohluft- in the clean air area is connectable, wherein in the contact area between the head portion and the partition a seal with sealing ribs is performed.
Die für den Betrieb von Verbrennungsmotoren aus der Umgebung angesaugte Luft darf keine Verunreinigungen enthalten, die eine bestimmte Korngröße überschreiten, da dies einen erhöhten Verschleiß verursachen und zu Schäden an empfindlichen Motor-Bauteilen führen würde. Deshalb muss die Luft vor Zufuhr zum Verbrennungsmotor gefiltert werden. Die hierfür benutzten Filterelemente sind oftmals als Taschenfilter ausgebildet. Unter normalen Betriebsbedingungen, wie sie zum Beispiel bei auf asphaltierten Straßen verkehrenden Fahrzeugen vorliegen, wird die Umgebungsluft üblicherweise in zufriedenstellender und ausrei- chender Weise mittels eines in der Luftzufuhr zum Motor angeordneten plissierten Papierfilters von Schmutzteilchen befreit, die im angesaugten Luftstrom mitgeführt werden. Mit zunehmender Betriebsdauer lagern sich dabei immer mehr Schmutzteilchen am Filterpapier an. Der Strömungswiderstand steigt hierdurch und der Luftzutritt wird erschwert. Bei einfachen Filterkonstruktionen ist in einem solchen Fall der zustandsorientierte Austausch des Luftfilters die einfachste und kostengünstige Lösung. The air drawn in to operate internal combustion engines from the environment must not contain impurities exceeding a certain grain size, as this would cause increased wear and damage to sensitive engine components. Therefore, the air must be filtered before being fed to the combustion engine. The filter elements used for this purpose are often designed as pocket filters. Under normal operating conditions, such as in asphalted road vehicles, the ambient air is usually released in a satisfactory and sufficient manner by means of a arranged in the air supply to the engine pleated paper filter from dirt particles that are carried in the intake air flow. As the operating time increases, more and more dirt particles accumulate on the filter paper. The flow resistance increases thereby and the access of air is made more difficult. In simple filter constructions, in such a case the condition-oriented replacement of the air filter is the simplest and most cost-effective solution.
Allerdings werden insbesondere schwere Motoren, wie sie beispielsweise in (Berg-) Baumaschinen, Panzern oder Schienenfahrzeugen zum Einsatz kommen, unter meist äußerst ungünstigen und staubhaltigen Umgebungsbedingungen be- trieben. Im Zusammenwirken mit den großen Luftvolumina, die derartige Motoren für ihren Betrieb benötigen, übersteigt die vom Motor fernzuhaltende Schmutzfracht deutlich das Niveau eines typischen Straßenfahrzeuges. Die Luftfilter werden schon bei kurzen Betriebsdauern mit großen Mengen von Schmutzteilchen belastet und erzeugen einen hohen Strömungswiderstand. Es ist deshalb üblich, mehrstufige Filtersysteme einzusetzen. So sind beispielsweise verschiedene Kombinationen von vorabscheidenden und akkumulierenden Filtern bekannt, wie z.B. die Kombination eines Mehrfachdüsenlüftungsgitters mit Zyklonfiltern und nachgeschalteten plissierten Papierfiltern. However, especially heavy motors, such as those used in (mountain) construction machines, tanks or rail vehicles, are operated under usually extremely unfavorable and dusty ambient conditions. In conjunction with the large volumes of air required by such engines for their operation, the dirt load to be kept away from the engine significantly exceeds the level of a typical road vehicle. The air filters are already loaded with large amounts of dirt particles during short periods of operation and produce a high flow resistance. It is therefore common practice to use multi-stage filter systems. Thus, for example, various combinations of pre-separating and accumulating filters are known, such as the combination of a multi-nozzle ventilation grille with cyclone filters and downstream pleated paper filters.
Aus der WO 2000/074818 A1 ist eine Luftfilter-Anordnung bekannt, die eine erste von der angesaugten Luft zu durchströmende Filterstufe mit einer V-förmigen Anordnung zweier Filterplatten sowie eine zweite Filterstufe zur Feinfilterung der Luft aufweist. Beide Filterstufen sind durch eine Trennwand des Filtergehäuses vonei- nander getrennt. In dieser Trennwand ist eine Öffnung zum Übertritt von Luft aus der ersten Filterstufe in die zweite Filterstufe vorgesehen. Das Luftaustrittsende der als„V-Filterpackung" bezeichneten V-förmigen Anordnung zweier Filterplatten der ersten Filterstufe besitzt einen Dichtungsring. Zur Verbesserung der Dichtheit sind am Luftaustrittsende der V-Filterpackung zwei zusätzliche Anschlagleisten aus Metall vorgesehen, welche parallel zu den Rändern der Öffnung in der Trennwand ausgerichtet sind. Dabei überragt die Bauhöhe des Dichtungsringes im un- montierten Zustand die Bauhöhe der beiden Anschlagleisten. Mittels einer Haltebzw. Hub-Mechanik ist die V-Filterpackung gegen die Trennwand des Filtergehäuses anhebbar. In der Betriebsposition stößt das Luftaustrittsende der V- Filterpackung gegen die beiden Anschlagleisten, so dass der Dichtungsring gestaucht wird. WO 2000/074818 A1 discloses an air filter arrangement which has a first filter stage to be flowed through by the intake air with a V-shaped arrangement of two filter plates and a second filter stage for fine filtering of the air. Both filter stages are separated from each other by a partition wall of the filter housing. In this partition, an opening for the passage of air from the first filter stage is provided in the second filter stage. The air outlet end of the V-shaped arrangement of two filter plates of the first filter stage, referred to as a "V-filter pack", has a sealing ring to improve tightness at the air outlet end of the V-filter pack two additional metal stop strips are provided parallel to the edges of the opening in the The mounting height of the sealing ring in the unassembled state exceeds the overall height of the two stop strips by means of a holding or lifting mechanism, the V-filter pack can be raised against the dividing wall of the filter housing against the two stop strips, so that the sealing ring is compressed.
Das Bewegen des Luftfilters zwischen einer ersten Außer-Betriebs-Position und einer zweiten Betriebs-Position sowie das Verriegeln des Luftfilters in der zweiten Betriebs-Position ist jedoch mechanisch aufwändig. Insbesondere kann es aber zu Undichtigkeiten durch verklemmte oder versprödete Dichtungsringe kommen.  However, moving the air filter between a first out-of-service position and a second operating position and locking the air filter in the second operating position is mechanically cumbersome. In particular, however, leaks can occur due to jammed or embrittled sealing rings.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung zum Filtern von Luft bereitzustellen, welche ein Filtergehäuse mit einem Rohluft- und einem Reinluftbereich umfasst, wobei Roh- und Reinluftbereich durch eine Trennwand ge- geneinander abgetrennt sind, sowie mindestens ein Filterelement umfasst, das mittels eines Kopfabschnittes mit mindestens einer in der Trennwand eingebrachten Öffnung zum Durchtritt eines Luftstromes vom Rohluft- in den Reinluftbereich verbindbar ist, wobei im Kontaktbereich zwischen Kopfabschnitt und Trennwand eine Dichtung mit Dichtrippen ausgeführt ist, die eine gegenüber dem vorbekann- ten Stand der Technik verbesserte Abdichtung zwischen Rohluft- und Reinluftbereich ermöglicht. The invention is therefore based on the object to provide a device for filtering air, which comprises a filter housing with a Rohluft- and a clean air area, the raw and clean air area are separated by a partition against each other, and at least one filter element comprises by means of a head portion with at least one opening introduced in the partition wall for the passage of an air flow from the raw air into the clean air area is connectable, wherein in the contact area between the head portion and the partition wall, a seal is designed with sealing ribs, which has a relation to the vorbekann- The prior art improved sealing between raw air and clean air area allows.
Erfindungsgemäß wird diese Aufgabe in Verbindung mit dem Oberbegriff des Pa- tentanspruches 1 dadurch gelöst, dass eine zusätzliche Vorrichtung zum Beaufschlagen eines zwischen zwei Dichtrippen ausgebildeten Zwischenraums mit Druckluft vorgesehen ist, mittels der neben einer konstanten Zufuhr von Sperrluft ein zusätzlicher Druckluftimpuls erzeugbar ist. Die Sperrluft steht gegenüber Roh- sowie Reinluftbereich unter Überdruck und wird der Trennwand über einen Anschluss zugeführt. Auch im Falle eventueller Undichtheiten wird der Übertritt von Roh- oder Reinluft in den jeweils benachbarten Bereich des Luftfilters vermieden, da die Roh- bzw. Reinluft hierzu erst die Sperrluft überwinden müsste. Durch den Einsatz von Sperrluft wird somit eine zu- verlässige Trennung zwischen Roh- und Reinluft erreicht. Die Sperrluft kann dabei dem Reinluftbereich des Luftfilters entnommen werden. According to the invention this object is achieved in conjunction with the preamble of patent claim 1, characterized in that an additional device for applying a formed between two sealing ribs gap is provided with compressed air, by means of the addition of a constant supply of sealing air, an additional compressed air pulse can be generated. The sealing air is under pressure compared to raw and clean air and is supplied to the partition via a connection. Even in the event of possible leaks, the passage of raw or clean air into the respectively adjacent area of the air filter is avoided since the raw or clean air would first have to overcome the blocking air for this purpose. The use of sealing air thus achieves a reliable separation between raw and clean air. The sealing air can be removed from the clean air area of the air filter.
Zusätzlich kann durch das Überwachen des Druckniveaus der Sperrluft die Funktionsfähigkeit der Dichtung überprüft werden. Sobald das Druckniveau der Sperrluft abfällt, muss eine Undichtheit vorliegen, die ein Entweichen von Sperrluft aus dem Zwischenraum zwischen den Dichtrippen ermöglicht.  In addition, by monitoring the pressure level of the sealing air, the operability of the seal can be checked. As soon as the pressure level of the sealing air drops, there must be a leak that allows escape of blocking air from the space between the sealing ribs.
Die Erfindung sieht nun die Erzeugung von zusätzlichen Sperrluft-Druckimpulsen vor, welche in bestimmten Intervallen bzw. zu bestimmten Zeitpunkten das herkömmliche Druckniveau der Sperrluft überlagern und einen Druckluftstoß in den Zwischenraum zwischen den Dichtrippen einleiten. Die Dichtrippen sind hinsicht- lieh Material und Dimensionierung derart flexibel ausgeführt, dass sie durch den Druckluftstoß nach außen bzw. voneinander weg bewegbar sind (d.h. also der Zwischenraum zwischen den Dichtrippen sich vergrößert). Auf diese Weise können die Dichtrippen durch das gezielte Einblasen eines Druckluftimpulses neu ausgerichtet werden. Dies ist z.B. vorteilhaft, wenn sich die Dichtrippen entweder schon beim Einsetzen des Filterelementes in das Filtergehäuses oder aber erst später durch Einwirkung von Umgebungsbedingungen wie z.B. Vibrationen oder kleineren temperaturinduzierten Längen- bzw. Lageänderungen verlegt oder verdreht haben. Auf diese Weise kann die optimale Dichtwirkung wiederhergestellt werden. Dies ist vorteilhaft einsetzbar, wenn die Anpressung des Filterelementes gegen die Trennwand ohnehin reduziert ist. So kann es beispielsweise insbesondere dann, wenn es sich bei den Filterelementen um Taschenfilter handelt und für das Aufbrechen der Schmutzschichten auf deren Filterabschnitten eine Druckluft- Rückstromanlage eingesetzt wird (d.h. das Abreinigen der Filter erfolgt durch Einlasen von Druckluft entgegen der Hauptströmungsrichtung der Roh- bzw. Reinluft), während des Abreinigens eines Filterelementes zu einem geringfügigen Entspannen der Dichtungen dieses Filterelementes kommen. Die Erfindung sieht dabei vor, die Sperrluft-Versorgung derart mit dem Abreinigungsvorgang zu synchro- nisieren, dass immer dann, wenn Druckluft in Rückstromrichtung in die taschen- förmigen Filterabschnitte eingeblasen wird, die Vorrichtung zum Beaufschlagen des Zwischenraumes mit Sperrluft einen zusätzlichen Druckluftimpuls erzeugt und in den Zwischenraum zwischen den Dichtrippen einleitet. Die Erschütterung des Filterelementes während des Abreinigens wird zum Ausrichten der Dichtungsrip- pen genutzt. Auf diese Weise wird die Dichtwirkung auch während langer Betriebszeiten oder unter unvorteilhaften Umgebungsbedingungen (z.B. Vibrationen etc ..) zuverlässig aufrechterhalten und die Notwendigkeit korrigierender Eingriffe durch Bedienpersonal wirksam reduziert. Eine sinnvolle Weiterentwicklung des erfinderischen Grundkonzeptes sieht vor, dass die Vorrichtung mindestens eine Schiene zum Anpressen und kraftschlüssigen Halten des Kopfabschnittes des Filterelementes gegen die Trennwand aufweist. Hierzu kann in vorteilhafter Weise ein umlaufender Flansch am Kopfabschnitt des Filterelementes vorgesehen sein, an dessen rohluftseitiger Oberfläche die Schiene aufsitzt. The invention now provides for the generation of additional blocking air pressure pulses, which superimpose the conventional pressure level of the sealing air at certain intervals or at certain times and initiate a blast of compressed air in the space between the sealing ribs. With regard to material and dimensioning, the sealing ribs are made so flexible that they can be moved outward or away from one another by the compressed-air impact (ie, the gap between the sealing ribs increases). In this way, the sealing ribs can be realigned by the targeted injection of a compressed air pulse. This is advantageous, for example, when the sealing ribs have either been installed or twisted when inserting the filter element into the filter housing or only later by the action of environmental conditions such as vibrations or smaller temperature-induced length or position changes. In this way, the optimal sealing effect can be restored. This can be used advantageously when the contact pressure of the filter element against the partition wall is reduced anyway. So it may, for example, in particular when it comes to the filter elements are pocket filter and for breaking up the dirt layers on the filter sections a compressed air Rückstromanlage is used (ie the cleaning of the filter takes place by injecting compressed air against the main flow direction of the raw or Clean air), during the cleaning of a filter element to a slight relaxation of the seals of this filter element come. In this case, the invention provides for synchronizing the sealing air supply with the cleaning process in such a way that whenever compressed air is blown into the pocket-shaped filter sections in the return flow direction, the device for pressurizing the intermediate space with sealing air generates an additional compressed-air pulse and introduces the space between the sealing ribs. The vibration of the filter element during cleaning is used to align the sealing ribs. In this way, the sealing effect is reliably maintained even during long periods of operation or under unfavorable environmental conditions (eg vibrations etc.) and effectively reduces the need for corrective intervention by operating personnel. A useful further development of the inventive basic concept provides that the device has at least one rail for pressing and frictionally holding the head portion of the filter element against the partition wall. For this purpose, an encircling flange may be provided on the head section of the filter element in an advantageous manner, on the surface of the raw air side of which the rail rests.
Eine solche Befestigung gewährleistet eine Längsausdehnung des Filterelementes bei hohen Umgebungstemperaturänderungen. Temperaturinduzierte Längenänderungen des Filterelementes werden also nicht durch Schrauben, Bolzen oder ähnliches behindert, die das Filterelement unmittelbar gegen die Trennwand fixieren. Stattdessen bleibt ein Kriechen des Filterelementes unter der Schiene möglich. Dies ist von besonderer Bedeutung, da die Filterelemente oftmals aus Materialien gefertigt sind, die einer starken temperaturinduzierten Längenänderung unterliegen. Insbesondere bei Luftfiltern in den Ansaugkanälen von Verbrennungskraftmaschinen in Lokomotiven, Baumaschinen, Bergbaugeräten oder Panzern ist dies ein wichtiger Aspekt für die Gebrauchstauglichkeit erfindungsgemäßer Luftfilter- Vorrichtungen. Such attachment ensures a longitudinal extension of the filter element at high ambient temperature changes. Temperature-induced changes in length of the filter element are therefore not hindered by screws, bolts or the like, which fix the filter element directly against the partition. Instead, a creep of the filter element under the rail is possible. This is of particular importance, since the filter elements are often made of materials that are subject to a strong temperature-induced change in length. Especially with air filters in the intake ports of internal combustion engines in locomotives, construction machinery, mining equipment or tanks this is an important aspect for the serviceability of inventive air filter devices.
Es ist in diesem Zusammenhang besonders vorteilhaft, wenn die die mindestens eine Schiene als Schwertführung ausgebildet ist. Ein solches erfindungsgemäßes Schwert weist einen mittleren Kontaktbereich auf, der die gesamte Länge des Filterelementes zuzüglich dessen eventueller temperaturinduzierter Längsausdehnungen abdeckt. An den beiden längsseitigen Enden des Kontaktbereiches weist das Schwert jeweils einen Befestigungsbereich auf, in denen das Schwert mittels Schrauben oder Haken gegen die Trennwand des Filtergehäuses fixiert werden kann. Durch entsprechendes Anziehen der Schrauben übt der Kontaktbereich des Schwertes eine Anpresswirkung gegen den rohluftseitigen Rücken des Kopfabschnittes des Filterelementes aus und hält diesen ausschließlich durch Kraft- schluss gegen die Trennwand. It is particularly advantageous in this context if the at least one rail is designed as a sword guide. Such a sword according to the invention has a central contact area which covers the entire length of the filter element plus its possible temperature-induced longitudinal expansions. At the two longitudinal ends of the contact region, the sword has in each case a fastening region in which the sword can be fixed by means of screws or hooks against the dividing wall of the filter housing. By appropriate tightening of the screws, the contact area of the sword exerts a pressing action against the back side of the head portion of the filter element on the raw air side and holds it against the dividing wall exclusively by force fit.
Die Erfindung schlägt ferner vor, dass der Kopfabschnitt des Filterelementes mindestens ein Zentrierelement zur Ausrichtung des Filterelementes bezüglich der Trennwand aufweist. Ein solches Zentrierelement erleichtert die korrekte Ausrichtung und Montage des Filterelementes in einer erfindungsgemäßen Vorrichtung. The invention further proposes that the head section of the filter element has at least one centering element for aligning the filter element with respect to the dividing wall. Such a centering element facilitates the correct alignment and assembly of the filter element in a device according to the invention.
Die Erfindung umfasst auch eine Antriebsanlage sowie ein Schienenfahrzeug mit jeweils einer erfindungsgemäß ausgeführten Vorrichtung zum Filtern von Luft. The invention also includes a drive system and a rail vehicle, each with an inventively designed device for filtering air.
Die vorliegende Erfindung wird nachfolgend anhand eines Ausführungsbeispieles und dazugehöriger Zeichnungen näher erläutert. Es zeigen The present invention will be explained in more detail with reference to an embodiment and associated drawings. Show it
Figur 1 : Vorrichtung zur Luftfilterung Figure 1: device for air filtration
Figur 2: Detaildarstellung„A" der Abdichtung zwischen Taschenfilter und Trennwand Figure 2: Detail representation "A" of the seal between bag filter and partition
Figur 3: Detailansicht der Befestigung des Taschenfilters an der Trennwand Figur 4: Zentrierung des Taschenfilters Figur 1 zeigt eine erfindungsgemäße Vorrichtung zur Luftfilterung, die in den Dachaufbau einer Diesellokomotive integriert ist. Derartige Luftfilter dienen zur Reinigung der aus der Umgebung angesaugten Luft, bevor diese dem Verbrennungsmotor zugeführt wird. Die Luftansaugung sowie die Abführung der Luft zum Verbrennungsmotor entsprechen dem Stand der Technik und sind deshalb nicht näher dargestellt. Die Luftfilter-Vorrichtung besteht im Wesentlichen aus einer Rohluftkammer sowie einer Reinluftkammer, welche durch eine Trennwand (2) gegeneinander abgetrennt sind. In der Rohluftkammer ist eine Mehrzahl von Lastfiltereinsätzen eingebaut, welche als Taschenfilter (4) ausgeführt sind. Jeder Ta- schenfilter umfasst drei Filterabschnitte aus plissiertem Filtermaterial. Die Filterabschnitte sind an einem Ende mit einer Endplatte zu einem gemeinsamen Kopfabschnitt (8) vergossen. Der Kopfabschnitt (8) weist für jeden Filterabschnitt eine eigenständige Durchgangsöffnung auf, welche den Durchtritt von Luft aus dem Innern des Filterabschnittes nach außen ermöglicht. Die Trennwand (2) weist eine der Anzahl von Taschenfiltern (4) entsprechende Mehrzahl von Durchgangsöffnungen (12) auf, welche den Durchtritt eines Luftstroms von der Rohluftkammer bzw. den Taschenfiltern (4) in die Reinluftkammer ermöglichen. Die Taschenfilter (4) sind derart an der Rohluftseite der Trennwand (2) befestigt, dass jeweils ein Taschenfilter (4) mit einer Durchgangsöffnung (12) in Verbindung steht. Die Trennwand (2) weist einen inneren Hohlraum (13) auf (besser erkennbar in Figur 2). Dieser Hohlraum (13) ist mittels einer Luftzufuhr (1 ) mit Druckluft beaufschlagbar, wobei nicht nur konstante Sperrluft zugeführt wird, sondern mittels einer in Figur 1 nicht dargestellten, an die Luftzufuhr (1 ) pneumatisch angeschlossenen Vorrichtung in Intervallen zusätzliche die Sperrluft-Zufuhr überlagernde Druckluft- Impulse erzeugt und in den Hohlraum (13) eingeleitet werden. Die Taschenfilter (4) sind an ihren Kopfabschnitten (8) jeweils mittels einer Dichtung (3) rohluftseitig gegenüber der Trennwand (2) abgedichtet. Figure 3: Detail view of the attachment of the pocket filter to the partition Figure 4: Centering of the pocket filter Figure 1 shows an inventive device for air filtration, which is integrated into the roof structure of a diesel locomotive. Such air filters are used to clean the air sucked from the environment before it is supplied to the internal combustion engine. The air intake and the discharge of air to the internal combustion engine correspond to the prior art and are therefore not shown in detail. The air filter device consists essentially of a raw air chamber and a clean air chamber, which are separated by a partition wall (2) against each other. In the Rohluftkammer a plurality of load filter inserts is installed, which are designed as a pocket filter (4). Each pocket filter comprises three filter sections made of pleated filter material. The filter sections are potted at one end with an end plate to a common head portion (8). The head section (8) has a separate passage opening for each filter section, which allows the passage of air from the interior of the filter section to the outside. The partition (2) has a number of pocket filters (4) corresponding plurality of through holes (12), which allow the passage of an air flow from the raw air chamber or the pocket filters (4) in the clean air chamber. The pocket filters (4) are fastened to the unfiltered air side of the dividing wall (2) in such a way that a pocket filter (4) is in each case connected to a passage opening (12). The partition (2) has an inner cavity (13) (better seen in Figure 2). This cavity (13) by means of an air supply (1) can be acted upon with compressed air, not only constant sealing air is supplied, but by means of a not shown in Figure 1, to the air supply (1) pneumatically connected device at intervals additional the sealing air supply superimposed Compressed air pulses generated and introduced into the cavity (13). The pocket filters (4) are each sealed at their head sections (8) by means of a seal (3) on the raw air side with respect to the dividing wall (2).
Aus Gründen der Übersichtlichkeit sind in Figur 1 nicht sämtliche dargestellten Taschenfilter bzw. Durchgangsöffnungen mit einer Bezugsziffer versehen. Im obe- ren Bereich sind die Rohluftkammer, die Taschenfilter (4) sowie die Trennwand (2) mittels eines gedachten Horizontalschnitts durchgetrennt, um die erfindungsgemäße Ausgestaltung der erfindungsgemäßen Abdichtung mittels einer in Figur 2 dargestellten Ansicht des Details„A" besser erkennbar zu machen. Figur 2 stellt das Detail„A" aus Figur 1 vergrößert dar. Die Dichtung (3), mittels der die Taschenfilter (4) an ihren Kopfabschnitten (8) rohluftseitig gegenüber der Trennwand (2) abgedichtet sind, umfasst zwei Dichtrippen (9, 10), welche durch einen Zwischenraum (1 1 ) voneinander getrennt sind. Beide Dichtrippen (9, 10) sind hinsichtlich Material und Dimensionierung derart flexibel ausgeführt, dass sie bei Beaufschlagung des Zwischenraums (1 1 ) mittels Druckluft voneinander weg bewegbar sind, insbesondere sobald im Zwischenraum (1 1 ) ein Überdruck gegenüber der Umgebung herrscht. Der Zwischenraum (1 1 ) steht mit dem Hohlraum (13) der Trennwand (2) in Verbindung, beispielsweise mittels einer Bohrung. Der in Figur 2 angedeutete Pfeil symbolisiert das Einströmen von Druckluft in den Zwischenraum (1 1 ) der Dichtung (3), welche mittels einer Vorrichtung in Form einer konstanten Sperrluft sowie die Sperrluft in Intervallen überlagernden Impulsen erzeugt und über die Luftzufuhr (1 ) (in Figur 2 nicht zu sehen) in den Hohlraum (13) der Trennwand (2) eingebracht wird. Durch das gezielte Einblasen eines solchen die Sperrluft überlagernden Druckluft-Impulses können die Dichtrippen neu ausgerichtet werden. Dies ist insbesondere vorteilhaft, wenn diese nach der erstmaligen Montage des Taschenfilters (4) an der Trennwand (8) oder durch anderweitige Einflüsse (wie z.B. temperaturinduzierte Relativbewegungen zwischen Kopfabschnitt (8) und Trennwand (2)) verlegt oder zueinander verdreht sind. Auf diese Weise kann die optimale Dichtwirkung wiederhergestellt werden. For reasons of clarity, not all of the illustrated pocket filters or passage openings are provided with a reference numeral in FIG. In the upper area, the unfiltered air chamber, the pocket filters (4) and the dividing wall (2) are cut by means of an imaginary horizontal section in order to better identify the inventive design of the seal according to the invention by means of a view of detail "A" shown in FIG. FIG. 2 shows the detail "A" of FIG. 1 enlarged. The seal (3), by means of which the pocket filters (4) are sealed at their head sections (8) to the dividing wall (2), comprises two sealing ribs (9, 10 Both sealing ribs (9, 10) are so flexible in terms of material and dimensioning that they are movable away from one another when the intermediate space (11) is acted upon by compressed air, in particular as soon as The intermediate space (1 1) communicates with the cavity (13) of the dividing wall (2), for example by means of a bore The arrow indicated in FIG. 2 symbolizes the inflow of compressed air into the gap (1 1) of the seal (3), which by means of a device in the form of a constant sealing air and the sealing air at intervals superimposed pulses generated and the Luftzufu hr (1) (not visible in FIG. 2) is introduced into the cavity (13) of the dividing wall (2). By selectively blowing such a compressed air pulse superimposed on the sealing air, the sealing ribs can be realigned. This is particularly advantageous if, after the first installation of the pocket filter (4) on the partition wall (8) or by other influences (such as temperature-induced relative movements between the head portion (8) and partition (2)) laid or twisted to each other. In this way, the optimal sealing effect can be restored.
In Figur 3 ist die Befestigung des Taschenfilters (4) an der Trennwand (2) dargestellt. Hierzu weist der Kopfabschnitt (8) des Taschenfilters (4) einen umlaufenden Flansch auf. Mittels zweier Befestigungsschwerter (5) ist der Flansch gegen die Trennwand (2) geklemmt. Die beiden Befestigungsschwerter (5) sind derart zueinander und in Bezug auf den Taschenfilter (4) ausgerichtet, dass eine Relativbewegung des Taschenfilters (4) in Bezug auf die Befestigungsschwerter (5) möglich ist. Da der Kopfabschnitt (8) und die Trennwand (2) aus Materialien mit unterschiedlichen Temperaturausdehnungskoeffizienten gefertigt sind, können sich beide Bauteile relativ zueinander bewegen, ohne dass die Fixierung des Taschenfilters (4) gegenüber der Trennwand (2) beschädigt oder aufgehoben wird. In Figure 3, the attachment of the pocket filter (4) on the partition wall (2) is shown. For this purpose, the head section (8) of the pocket filter (4) has a circumferential flange. By means of two fastening tabs (5), the flange is clamped against the partition wall (2). The two fastening tabs (5) are aligned with each other and with respect to the pocket filter (4) such that a relative movement of the pocket filter (4) with respect to the fastening tabs (5) is possible. Since the head portion (8) and the partition wall (2) are made of materials having different coefficients of thermal expansion, both components can move relative to each other without damaging or canceling the fixation of the pocket filter (4) to the partition wall (2).
In Figur 4 ist die Zentrierung der Filterelemente bzw. Taschenfilter (4) in Bezug auf die Trennwand (2) dargestellt. Hierzu weist jeder Kopfabschnitt (8) eines Taschenfilters (4) eine oder mehrere Zentriernocken (6) auf. Damit diese Zentriernocke in ein Gegenstück eingreifen kann, weist die Trennwand (2) ein die Durchgangsöffnung (12) überbrückendes Aufnahmeelement (7) auf. Falls der Taschenfilter (4) mittels des in Figur 3 dargestellten Befestigungsschwertes (5) an der Trennwand (2) gehalten ist, muss natürlich auch das Aufnahmeelement (7) in hierzu analoger Weise an der Trennwand (2) gehalten sein (in Figur 4 nicht dargestellt). FIG. 4 shows the centering of the filter elements or pocket filters (4) with respect to FIG the partition (2) shown. For this purpose, each head section (8) of a pocket filter (4) has one or more centering cams (6). In order for this centering cam to be able to engage in a counterpart, the dividing wall (2) has a receiving element (7) bridging the passage opening (12). If the pocket filter (4) is held on the dividing wall (2) by means of the fastening tab (5) shown in FIG. 3, the receiving element (7) must of course also be held on the dividing wall (2) in an analogous manner (not in FIG shown).
Bezugszeichenliste: LIST OF REFERENCE NUMBERS
1 Luftzufuhr in hohle Trennwand 1 air supply in hollow partition
2 Trennwand zwischen Roh- und Reinluftraum 2 Partition wall between raw and clean air space
3 Dichtung 3 seal
4 Taschenfilter  4 pocket filters
5 Befestigungsschwert  5 fastening sword
6 Zentriernocke  6 centering cam
7 Aufnahme für Zentriernocke  7 Mounting for centering cam
8 Kopfabschnitt des Taschenfilters  8 head section of the pocket filter
9 Dichtrippe  9 sealing rib
10 Dichtrippe  10 sealing rib
1 1 Zwischenraum  1 1 gap
12 Durchgangsöffnung  12 passage opening
13 Hohlraum in Trennwand  13 cavity in partition

Claims

Patentansprüche claims
Vorrichtung zum Filtern von Luft, umfassend ein Filtergehäuse mit einemDevice for filtering air, comprising a filter housing with a
Rohluft- und einem Reinluftbereich, wobei Roh- und Reinluftbereich durch eine Trennwand (2) gegeneinander abgetrennt sind, Rohluft- and a clean air area, the raw and clean air area separated by a partition (2) against each other,
sowie mindestens ein Filterelement (4), das mittels eines Kopfabschnittesand at least one filter element (4), which by means of a head portion
(8) mit mindestens einer in der Trennwand (2) eingebrachten Öffnung zum(8) with at least one opening in the partition (2) for
Durchtritt eines Luftstromes vom Rohluft- in den Reinluftbereich verbindbar ist, Passage of an air flow from Rohluft- in the clean air area is connectable,
wobei im Kontaktbereich zwischen Kopfabschnitt (8) und Trennwand (2) eine Dichtung (3) mit Dichtrippen (9, 10) ausgeführt ist, dadurch gekennzeichnet, dass eine zusätzliche Vorrichtung zum Beaufschlagen eines zwischen zwei Dichtrippen (9, 10) ausgebildeten Zwischenraums (1 1 ) mit Druckluft vorgesehen ist, mittels der neben einer konstanten Zufuhr von Sperrluft ein zusätzlicher Druckluftimpuls erzeugbar ist. wherein in the contact area between the head section (8) and partition (2) a seal (3) with sealing ribs (9, 10) is executed, characterized in that an additional device for applying a between two sealing ribs (9, 10) formed intermediate space (1 1) is provided with compressed air, by means of which in addition to a constant supply of sealing air, an additional compressed air pulse can be generated.
Vorrichtung zum Filtern von Luft nach Patentanspruch 1 , dadurch gekennzeichnet, dass die Vorrichtung mindestens eine Schiene (5) zum Anpressen und kraftschlüssigen Halten des Kopfabschnittes (8) des Filterelementes (4) gegen die Trennwand (2) aufweist. Device for filtering air according to claim 1, characterized in that the device has at least one rail (5) for pressing and frictionally holding the head portion (8) of the filter element (4) against the partition wall (2).
Vorrichtung zum Filtern von Luft nach Patentanspruch 2, dadurch gekennzeichnet, dass die mindestens eine Schiene (5) als Schwertführung ausgebildet ist. Device for filtering air according to claim 2, characterized in that the at least one rail (5) is designed as a sword guide.
Vorrichtung zum Filtern von Luft nach einem der Patentansprüche 1 bis 3, dadurch gekennzeichnet, dass der Kopfabschnitt (8) des Filterelementes (4) mindestens ein Zentrierelement (6) zur Ausrichtung des Filterelementes (4) bezüglich der Trennwand (2) aufweist. Antriebsanlage mit einer Vorrichtung zum Filtern von Luft nach mindestens einem der Patentansprüche 1 bis 4. Device for filtering air according to one of the claims 1 to 3, characterized in that the head section (8) of the filter element (4) has at least one centering element (6) for aligning the filter element (4) with respect to the partition wall (2). Drive system with a device for filtering air according to at least one of the claims 1 to 4.
Schienenfahrzeug mit einer Vorrichtung zum Filtern von Luft nach mindestens einem der Patentansprüche 1 bis 4. Rail vehicle with a device for filtering air according to at least one of the claims 1 to 4.
PCT/EP2016/058171 2015-04-30 2016-04-14 Device for filtering air WO2016173849A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2215193A1 (en) * 1972-03-24 1973-10-04 Delbag Luftfilter Gmbh PARTICULATE AIR FILTER HOUSING WITH CLAMPING DEVICE FOR ACCOMPANYING FILTER CELLS FOR CLEANING THE AIR OF TOXIC OR RADIOACTIVE DUST OR GASES
GB1375942A (en) * 1973-01-05 1974-12-04 Revertex Ltd Fluid pressure seals
DE2709710A1 (en) * 1977-03-05 1978-09-07 Herman Geb Bruetting Margot Filter bag frame construction - in which the part to be mounted to a bag housing is pivoted to the rest
EP0295213A1 (en) * 1987-06-11 1988-12-14 Aeromatic AG Fluidised bed having a waste gas filter
FR2673257A1 (en) * 1991-02-26 1992-08-28 Giat Ind Sa Method and installation for establishing a leaktight seal around a filtering element separating two chambers at different pressures
WO2000074818A1 (en) 1999-06-03 2000-12-14 Donaldson Company, Inc. Multistage air cleaner including pulse cleaning system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2215193A1 (en) * 1972-03-24 1973-10-04 Delbag Luftfilter Gmbh PARTICULATE AIR FILTER HOUSING WITH CLAMPING DEVICE FOR ACCOMPANYING FILTER CELLS FOR CLEANING THE AIR OF TOXIC OR RADIOACTIVE DUST OR GASES
GB1375942A (en) * 1973-01-05 1974-12-04 Revertex Ltd Fluid pressure seals
DE2709710A1 (en) * 1977-03-05 1978-09-07 Herman Geb Bruetting Margot Filter bag frame construction - in which the part to be mounted to a bag housing is pivoted to the rest
EP0295213A1 (en) * 1987-06-11 1988-12-14 Aeromatic AG Fluidised bed having a waste gas filter
FR2673257A1 (en) * 1991-02-26 1992-08-28 Giat Ind Sa Method and installation for establishing a leaktight seal around a filtering element separating two chambers at different pressures
WO2000074818A1 (en) 1999-06-03 2000-12-14 Donaldson Company, Inc. Multistage air cleaner including pulse cleaning system

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