EP0631043A1 - Activated carbon filter for purging of a fuel tank - Google Patents

Activated carbon filter for purging of a fuel tank Download PDF

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Publication number
EP0631043A1
EP0631043A1 EP94104159A EP94104159A EP0631043A1 EP 0631043 A1 EP0631043 A1 EP 0631043A1 EP 94104159 A EP94104159 A EP 94104159A EP 94104159 A EP94104159 A EP 94104159A EP 0631043 A1 EP0631043 A1 EP 0631043A1
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EP
European Patent Office
Prior art keywords
activated carbon
connection
housing
carbon filter
filter according
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP94104159A
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German (de)
French (fr)
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EP0631043B1 (en
Inventor
Heinz Andress
Karl Ernst Hummel
Arthur Klotz
Thomas Schermuly
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Mann and Hummel GmbH
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Filterwerk Mann and Hummel GmbH
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Publication of EP0631043A1 publication Critical patent/EP0631043A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0854—Details of the absorption canister

Definitions

  • the invention relates to an activated carbon filter for fuel tank ventilation according to the preamble of the main claim.
  • Such activated carbon filters are known from practice. These generally have an activated carbon package in a housing made of plastic, the housing being connected via pipes to the fuel tank, the intake manifold of an internal combustion engine and the atmosphere.
  • an inner housing made of plastic is surrounded by an outer housing which is impermeable to fuel vapor.
  • This filter is very complex, since the outer housing cannot accommodate the connecting piece and therefore an additional cover has to be attached.
  • the outer housing must be placed sealingly over the inner housing so that the fuel vapor-permeable inner housing cannot emit harmful gases into the environment.
  • the invention has for its object to avoid the disadvantages mentioned and to create an activated carbon filter that is much easier to manufacture and has a high efficiency with regard to the degree of separation.
  • the main advantage of the invention is that the arrangement of at least two intersecting partitions creates at least four filter chambers through which the fuel vapors flow in succession and thus a substantial improvement in the adsorption of the fuel vapor is achieved.
  • further walls which of course allows the number of filter chambers to be increased as desired.
  • this arrangement in particular has considerable advantages for filters which have a flat design and are installed essentially horizontally. This filter does not require any springs to pretension the activated carbon package, since a bypass or short circuit caused by the deposition of the activated carbon is not possible.
  • An advantageous development of the invention provides for the partition walls to be designed such that the fuel vapors flow through all the chambers one after the other in a forced manner. Because of Because of the relatively large passage cross section of a respective chamber, a slow flow velocity is achieved and thus a high adsorption is ensured.
  • the separation between the first and the last chamber that is to say between the inlet chamber and the outlet chamber, is completely sealed, so that gas exchange between these two chambers is not possible under any operating condition.
  • a further embodiment of the invention is concerned with the respective front cover of the activated carbon.
  • a so-called filter foam is advantageously provided, which covers the activated carbon on one or both sides and generates a certain pre-tension due to the elasticity.
  • a further embodiment of the invention provides channels for guiding the fuel vapors in one or both end covers of the housing. These channels are designed at the same time so that they increase the stability of the covers and enable the function of supporting the activated carbon or the filter foam.
  • connections for the connection to the intake manifold of an internal combustion engine and the connection to the fuel tank can be clipped or snapped onto the housing, or can also be welded and molded onto the housing.
  • the cover of the housing is also vibration or mirror welded to the housing.
  • FIG. 1 An activated carbon filter is shown in a schematic representation in FIG. 1. It consists of a housing 10 which has a first connection 11. This is connected to the intake pipe of an internal combustion engine. Furthermore, a second connection 12 is provided, which is connected to the fuel tank and through which the fuel vapors are supplied. A connection 13 is also provided. This is related to the atmosphere.
  • a first partition 14 is located in the housing of the activated carbon filter connected.
  • the further partition 16 is connected between the chamber 17 and the chamber 18 with the lid 21 and in the region between the chambers 19, 20 with both the lid 21 and the bottom 15, so that a complete separation between chamber 19 and chamber 20th is guaranteed.
  • the chambers 17 to 20 are each filled with an activated carbon package 22, 23, 24, 25, the activated carbon being provided on the end faces with filter fleece layers which prevent activated carbon from escaping.
  • the gasoline or fuel vapors flowing in via the tank connection reach the activated carbon package 23, as shown in section CC, flow upwards and reach via a connection to the activated carbon package 22, flow downwards, then reach the activated carbon package 24 and flow through it and subsequently the activated carbon package 25.
  • the fuel vapors are thus passed through all four chambers in succession.
  • the hydrocarbon compounds are completely absorbed, only the remaining fresh air can flow into the atmosphere.
  • FIG. 2 shows a section through an activated carbon filter in a more detailed structure.
  • This activated carbon filter has a housing 26 on which a cover 27 is arranged. Both the housing and cover are made of a thermoplastic. This makes it possible to connect the cover to the housing, for example using vibration welding.
  • a partition 28 is integrated in the housing.
  • a further partition wall 29 running at right angles to the partition wall 28 is provided.
  • the activated carbon 31 is only shown in chamber 30.
  • the activated carbon is delimited in the lower area by a filter fleece mat 32 with respect to the channels 33.
  • a filter foam 34 is arranged in the upper region.
  • the filter fleece mat 34 rests on the arc-shaped spacer of the cover 27.
  • 36 channels 35 are provided between the arc-shaped spacers for the flow of the fuel vapors.
  • the entire activated carbon filter can be attached to a receptacle via a connecting flange 37, 38.
  • FIGS. 3a and 3b A further activated carbon filter is shown in FIGS. 3a and 3b.
  • a filter is shown in a side view in FIG. 3a.
  • a housing 39 is provided with a cover 40, the cover and housing here also being made of a thermoplastic and welded to one another.
  • the cover has channels 41 through which the fuel vapors are conducted from one chamber to the next chamber.
  • connections 42 for atmosphere, tank and suction pipe.
  • these connections can be fastened to an opening of the housing 39 by means of a rotary welding process or mirror welding. Direct injection of the connections is also possible.
  • FIG. 3 c shows in a first variant a connection 46 for supplying the fuel vapors, which is clipped into the housing 39.
  • This connection 46 is provided with an immersion tube 47 and has a filter element 48 which prevents activated carbon from escaping.
  • the connection 46 is sealed on the housing 39 by means of an O-ring seal 49.
  • a connection 50 for the supply of fresh air is located on the right-hand chamber of the activated carbon filter.
  • connection 46 is provided with a cover element 51, which is welded to the housing 39 by means of vibration welding.
  • connection 50 for the supply of fresh air also has a cover element 52. This is also connected to the housing 39 by means of vibration welding.
  • FIG. 3e shows a complete cover 53, which contains all the connections and is fastened to the housing 39 in one work step by means of vibration welding.
  • the activated carbon 42, 43 within the housing 39 is covered in the lower area with a filter fleece 44 and in the upper area with a filter foam 45.
  • the filter foam 45 has an elasticity which creates a certain pre-tension on the activated carbon and thus prevents a relative movement of the activated carbon in the event of shocks or vibrations.
  • FIGS. 3a and 3b An activated carbon filter with two chambers is shown in FIGS. 3a and 3b. Of course there is the possibility to expand this activated carbon filter to four or more chambers.

Abstract

An activated charcoal filter for the venting of a fuel tank is proposed. The said filter comprises a housing (10), which receives activated charcoal packs. The housing (10) is line-connected on the one hand by way of a first connection (12) to the fuel tank and on the other by way of a second connection to the intake pipe (11), especially of an internal combustion engine, and by way of a third connection (13) to the atmosphere. The housing (10) has a first dividing wall (16), which runs between the connection (13) for the atmosphere and the connection (12) for the tank. At least one further dividing wall (14) is provided, which forms at least one further chamber (17, 18), each of the chambers being filled with activated charcoal. <IMAGE>

Description

Die Erfindung betrifft ein Aktivkohlefilter zur Kraftstofftankentlüftung nach dem Oberbegriff des Hauptanspruchs.The invention relates to an activated carbon filter for fuel tank ventilation according to the preamble of the main claim.

Derartige Aktivkohlefilter sind aus der Praxis bekannt. Diese weisen in der Regel ein Aktivkohlepaket in einem Gehäuse aus Kunststoff auf, wobei das Gehäuse leitungsmäßig über Stutzen mit dem Kraftstofftank, mit dem Saugrohr eines Verbrennungsmotors sowie mit der Atmosphäre in Verbindung steht.Such activated carbon filters are known from practice. These generally have an activated carbon package in a housing made of plastic, the housing being connected via pipes to the fuel tank, the intake manifold of an internal combustion engine and the atmosphere.

Aus der DE-PS 24 07 128 ist eine ähnlich aufgebaute Adsorptionsanlage bekannt, bei der das, das absorbierende Material aufnehmende Volumen des Gehäuses durch eine Trennwand in zwei Bereiche aufgeteilt ist.From DE-PS 24 07 128 a similarly constructed adsorption system is known, in which the volume of the housing that absorbs the absorbent material is divided into two areas by a partition.

Es ist ferner aus der DE-OS 41 24 653 ein Aktivkohlefilter bekannt, welches aus einem ovalen Gehäuse besteht in dem eine Trennwand angeordnet ist und bei dem das Aktivkohlepaket durch Druckfedern vorgespannt ist, um ein Aufrütteln der Aktivkohle und damit eine eventuelle Störung zu verhindern.It is also known from DE-OS 41 24 653 an activated carbon filter, which consists of an oval housing in which a partition is arranged and in which the activated carbon package is biased by compression springs in order to prevent the activated carbon from shaking and thus a possible malfunction.

Bei dem bekannten Aktivkohlefilter ist ein aus Kunststoff bestehendes Innengehäuse mit einem kraftstoffdampfundurchlässigen Außengehäuse umgeben. Dieses Filter ist sehr aufwendig, da das Außengehäuse die Anschlußstutzen nicht aufnehmen kann und damit ein zusätzlicher Deckel angebracht werden muß. Außerdem muß das Außengehäuse abdichtend über das Innengehäuse gestülpt werden, damit das kraftstoffdampfdurchlässige Innengehäuse keine schädlichen Gase in die Umgebung abgeben kann.In the known activated carbon filter, an inner housing made of plastic is surrounded by an outer housing which is impermeable to fuel vapor. This filter is very complex, since the outer housing cannot accommodate the connecting piece and therefore an additional cover has to be attached. In addition, the outer housing must be placed sealingly over the inner housing so that the fuel vapor-permeable inner housing cannot emit harmful gases into the environment.

Der Erfindung liegt die Aufgabe zugrunde, die genannten Nachteile zu vermeiden und ein Aktivkohlefilter zu schaffen, das wesentlich einfacher in der Herstellung ist und eine hohe Wirksamkeit bezüglich des Abscheidegrades aufweist.The invention has for its object to avoid the disadvantages mentioned and to create an activated carbon filter that is much easier to manufacture and has a high efficiency with regard to the degree of separation.

Diese Aufgabe wird, ausgehend von dem Oberbegriff des Hauptanspruchs durch dessen kennzeichnenden Merkmale gelöst.This object is achieved on the basis of the preamble of the main claim by its characterizing features.

Der wesentliche Vorteil der Erfindung ist darin zu sehen, daß durch die Anordnung von wenigstens zwei sich kreuzenden Trennwänden, mindestens vier Filterkammern geschaffen werden, die von den Kraftstoffdämpfen nacheinander durchströmt werden und damit eine wesentliche Verbesserung der Adsorption des Kraftstoffdampfes erzielt wird. Selbstverständlich besteht die Möglichkeit, weitere Wände einzubauen wodurch die Anzahl der Filterkammern sich natürlich beliebig erhöhen läßt. Es hat sich gezeigt, daß gerade diese Anordnung bei Filtern, die eine flache Bauweise aufweisen und im wesentlichen horizontal eingebaut werden, erhebliche Vorteile bringt. So sind bei diesem Filter keine Federn zur Vorspannung des Aktivkohlepakets erforderlich, da ein Bypaß bzw. Kurzschluß der durch das Absetzen der Aktivkohle verursacht wird, nicht möglich ist.The main advantage of the invention is that the arrangement of at least two intersecting partitions creates at least four filter chambers through which the fuel vapors flow in succession and thus a substantial improvement in the adsorption of the fuel vapor is achieved. Of course, there is the possibility of installing further walls, which of course allows the number of filter chambers to be increased as desired. It has been shown that this arrangement in particular has considerable advantages for filters which have a flat design and are installed essentially horizontally. This filter does not require any springs to pretension the activated carbon package, since a bypass or short circuit caused by the deposition of the activated carbon is not possible.

Eine vorteilhafte Weiterbildung der Erfindung sieht vor, die Trennwände so zu gestalten, daß die Kraftstoffdämpfe sämtliche Kammern nacheinander zwangsgeführt durchströmen. Aufgrund des relativ großen Durchtrittsquerschnittes einer jeweiligen Kammer wird eine langsame Strömungsgeschwindigkeit erzielt und damit eine hohe Adsorption gewährleistet.An advantageous development of the invention provides for the partition walls to be designed such that the fuel vapors flow through all the chambers one after the other in a forced manner. Because of Because of the relatively large passage cross section of a respective chamber, a slow flow velocity is achieved and thus a high adsorption is ensured.

Gemäß einer Ausgestaltung der Erfindung ist vorgesehen, die Abtrennung zwischen der ersten und der letzten Kammer, das heißt zwischen der Eintrittskammer und der Austrittskammer, vollkommen abzudichten, so daß ein Gasaustausch zwischen diesen beiden Kammern unter jeder Betriebsbedingung nicht möglich ist.According to one embodiment of the invention, the separation between the first and the last chamber, that is to say between the inlet chamber and the outlet chamber, is completely sealed, so that gas exchange between these two chambers is not possible under any operating condition.

Eine weitere Ausgestaltung der Erfindung befasst sich mit der jeweils stirnseitigen Abdeckung der Aktivkohle. Hierfür ist in vorteilhafter Weise ein sogenannter Filterschaum vorgesehen, der die Aktivkohle auf einer oder beiden Seiten bedeckt und aufgrund der Elastizität eine gewisse Vorspannung erzeugt.A further embodiment of the invention is concerned with the respective front cover of the activated carbon. For this purpose, a so-called filter foam is advantageously provided, which covers the activated carbon on one or both sides and generates a certain pre-tension due to the elasticity.

Eine weitere Ausgestaltung der Erfindung sieht zur Führung der Kraftstoffdämpfe Kanäle in einer oder beiden stirnseitigen Abdeckungen des Gehäuses vor. Diese Kanäle sind gleichzeitig so ausgestaltet, daß sie die Stabilität der Abdeckungen erhöhen und die Funktion der Abstützung der Aktivkohle bzw. des Filterschaums ermöglichen.A further embodiment of the invention provides channels for guiding the fuel vapors in one or both end covers of the housing. These channels are designed at the same time so that they increase the stability of the covers and enable the function of supporting the activated carbon or the filter foam.

Die Anschlüsse für die Verbindung mit dem Saugrohr eines Verbrennungsmotors und die Verbindung mit dem Kraftstofftank können an das Gehäuse angeklipst bzw. eingerastet oder auch mit dem Gehäuse verschweißt sowie angespritzt sein. Auch der Deckel des Gehäuses ist mit dem Gehäuse vibrations- oder spiegelverschweißt. Zur Befestigung des Filterschaums bzw. eines Filtervlieses im Bereich der Kanäle ist es vorteilhaft, die Oberfläche dieser Kanäle durch thermische Erwärmung anzuschmelzen und in diesem Leicht aufgeschmolzenen Kunststoff das Vlies bzw. den Filterschaum einzulegen. Diese Anordnung stellt eine vibrationssichere und stoßsichere Verbindung dar.The connections for the connection to the intake manifold of an internal combustion engine and the connection to the fuel tank can be clipped or snapped onto the housing, or can also be welded and molded onto the housing. The cover of the housing is also vibration or mirror welded to the housing. To attach the filter foam or a filter fleece in the region of the channels, it is advantageous to melt the surface of these channels by thermal heating and to insert the fleece or the filter foam in this slightly melted plastic. This arrangement represents a vibration-proof and shockproof connection.

Diese und weitere Merkmale von bevorzugten Weiterbildungen der Erfindung gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei der Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein und vorteilhafte sowie für sich schutzfähige Ausführungen darstellen können, für die hier Schutz beansprucht wird.These and other features of preferred developments of the In addition to the claims, the invention also emerge from the description and the drawings, the individual features being implemented individually or in groups in the form of sub-combinations in the embodiment of the invention and in other fields and can represent advantageous and protectable embodiments , for which protection is claimed here.

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher erläutert. Die Zeichnungen zeigen:

Figur 1
Eine Draufsicht und drei Schnittdarstellungen eines schematisch dargestellten Aktivkohlefilters,
Figur 2
die Schnittdarstellung eines Aktivkohlefilters,
Figur 3a
ein weiterer Aktivkohlefilter,
Figur 3b
die Schnittdarstellung gemäß Schnitt D-D in Figur 3a,
Figur 3c,d,e
Varianten für die Anordnung der Anschlüsse an das Aktivkohlefilter.
Embodiments of the invention are shown in the drawings and are explained in more detail below. The drawings show:
Figure 1
A top view and three sectional views of a schematically illustrated activated carbon filter,
Figure 2
the sectional view of an activated carbon filter,
Figure 3a
another activated carbon filter,
Figure 3b
the sectional view according to section DD in Figure 3a,
Figure 3c, d, e
Variants for the arrangement of the connections to the activated carbon filter.

Ein Aktivkohlefilter ist in einer schematischen Darstellung in Fig. 1 gezeigt. Es besteht aus einem Gehäuse 10, welches einen ersten Anschluß 11 aufweist. Dieser ist mit dem Ansaugrohr einer Brennkraftmaschine verbunden. Ferner ist ein zweiter Anschluß 12 vorgesehen, welcher mit dem Kraftstofftank verbunden ist und durch welchen die Kraftstoffdämpfe zugeführt werden. Außerdem ist ein Anschluß 13 vorgesehen. Dieser steht mit der Atmosphäre in Verbindung.An activated carbon filter is shown in a schematic representation in FIG. 1. It consists of a housing 10 which has a first connection 11. This is connected to the intake pipe of an internal combustion engine. Furthermore, a second connection 12 is provided, which is connected to the fuel tank and through which the fuel vapors are supplied. A connection 13 is also provided. This is related to the atmosphere.

In dem Gehäuse des Aktivkohlefiltes befindet sich eine erste Trennwand 14. Diese ist mit dem Boden 15 des Gehäuses 10 verbunden. Die weitere Trennwand 16 ist zwischen der Kammer 17 und der Kammer 18 mit dem Deckel 21 verbunden und im Bereich zwischen den Kammern 19, 20 sowohl mit dem Deckel 21 als auch dem Boden 15 verbunden, so daß eine vollständige Trennung zwischen Kammer 19 und Kammer 20 gewährleistet ist. Die Kammern 17 bis 20 sind jeweils mit einem Aktivkohlepaket 22, 23, 24, 25 gefüllt, wobei die Aktivkohle an den Stirnseiten mit Filtervliesschichten versehen ist, die ein Austritt von Aktivkohle verhindert.A first partition 14 is located in the housing of the activated carbon filter connected. The further partition 16 is connected between the chamber 17 and the chamber 18 with the lid 21 and in the region between the chambers 19, 20 with both the lid 21 and the bottom 15, so that a complete separation between chamber 19 and chamber 20th is guaranteed. The chambers 17 to 20 are each filled with an activated carbon package 22, 23, 24, 25, the activated carbon being provided on the end faces with filter fleece layers which prevent activated carbon from escaping.

Die über den Tankanschluß einströmenden Benzin- bzw. Kraftstoffdämpfe gelangen wie in Schnitt C-C gezeigt, in das Aktivkohlepaket 23, strömen nach oben und gelangen über eine Verbindung zu dem Aktivkohlepaket 22, strömen nach unten, gelangen anschließend zu dem Aktivkohlepaket 24 und durchströmen dieses sowie nachfolgend das Aktivkohlepaket 25. Die Kraftstoffdämpfe werden somit nacheinander durch sämtliche vier Kammern geführt. Die Kohlenwasserstoffverbindungen werden vollständig absorbiert, lediglich der noch verbleibende Frischluftanteil kann in die Atmosphäre abströmen.The gasoline or fuel vapors flowing in via the tank connection reach the activated carbon package 23, as shown in section CC, flow upwards and reach via a connection to the activated carbon package 22, flow downwards, then reach the activated carbon package 24 and flow through it and subsequently the activated carbon package 25. The fuel vapors are thus passed through all four chambers in succession. The hydrocarbon compounds are completely absorbed, only the remaining fresh air can flow into the atmosphere.

Sobald der Verbrennungsmotor in Betrieb gesetzt wird, wird über den Anschluß 11 Gas aus dem Aktivkohlefilter abgesaugt. Dadurch strömt Frischluft über den Anschluß 13 in das Aktivkohlefilter und regeneriert diese.As soon as the internal combustion engine is started, gas is sucked out of the activated carbon filter via the connection 11. Fresh air thus flows into the activated carbon filter via the connection 13 and regenerates it.

Figur 2 zeigt einen Schnitt durch ein Aktivkohlefilter in einem detaillierteren Aufbau. Dieses Aktivkohlefilter besitzt ein Gehäuse 26 auf welchem ein Deckel 27 angeordnet ist. Sowohl Gehäuse als auch Deckel bestehen aus einem thermoplastischen Kunststoff. Damit besteht die Möglichkeit, den Deckel mit dem Gehäuse, beispielsweise über Vibrationsschweißen zu verbinden.Figure 2 shows a section through an activated carbon filter in a more detailed structure. This activated carbon filter has a housing 26 on which a cover 27 is arranged. Both the housing and cover are made of a thermoplastic. This makes it possible to connect the cover to the housing, for example using vibration welding.

In dem Gehäuse ist eine Trennwand 28 integriert. Außerdem ist eine weitere, rechtwinklig zu der Trennwand 28 verlaufende Trennwand 29 vorgesehen. Zur besseren Darstellung des Aufbaus ist die Aktivkohle 31 lediglich in Kammer 30 eingezeichnet.A partition 28 is integrated in the housing. In addition, a further partition wall 29 running at right angles to the partition wall 28 is provided. For a better representation of the structure the activated carbon 31 is only shown in chamber 30.

Die Aktivkohle ist im unteren Bereich durch eine Filtervliesmatte 32 gegenüber den Kanälen 33 begrenzt. Im oberen Bereich ist ein Filterschaum 34 angeordnet. Die Filtervliesmatte 34 liegt am bogenförmig ausgestalteten Abstandshalter des Deckels 27 an. Für die Durchströmung der Kraftstoffdämpfe sind zwischen den bogenförmig ausgestalteten Abstandshalter 36 Kanäle 35 vorgesehen. Das gesamte Aktivkohlefilter kann über einen Anschlußflansch 37, 38 an einer Aufnahme befestigt werden.The activated carbon is delimited in the lower area by a filter fleece mat 32 with respect to the channels 33. A filter foam 34 is arranged in the upper region. The filter fleece mat 34 rests on the arc-shaped spacer of the cover 27. 36 channels 35 are provided between the arc-shaped spacers for the flow of the fuel vapors. The entire activated carbon filter can be attached to a receptacle via a connecting flange 37, 38.

Ein weiteres Aktivkohlefilter zeigt Figur 3a und 3b.A further activated carbon filter is shown in FIGS. 3a and 3b.

In Figur 3a ist ein Filter in einer Seitenansicht dargestellt. Ein Gehäuse 39 ist mit einem Deckel 40 versehen, wobei auch hier Deckel und Gehäuse aus einem thermoplastischen Kunststoff bestehen und miteinander verschweißt sind. Der Deckel weist Kanäle 41 auf, durch welche die Kraftstoffdämpfe von einer Kammer zur nächsten Kammer geleitet werden. Am unteren Bereich des Gehäuses 39 befinden sich die Anschlüsse 42 für Atmosphäre, Tank und Saugrohr. Diese Anschlüsse können, wie in Figur 3b auf der rechten Seite gezeigt, mittels eines Rotationsschweißverfahrens oder Spiegelschweißen auf einer Öffnung des Gehäuses 39 befestigt werden. Auch das unmittelbare Anspritzen der Anschlüsse ist möglich.A filter is shown in a side view in FIG. 3a. A housing 39 is provided with a cover 40, the cover and housing here also being made of a thermoplastic and welded to one another. The cover has channels 41 through which the fuel vapors are conducted from one chamber to the next chamber. At the bottom of the housing 39 there are connections 42 for atmosphere, tank and suction pipe. As shown in FIG. 3b on the right side, these connections can be fastened to an opening of the housing 39 by means of a rotary welding process or mirror welding. Direct injection of the connections is also possible.

Die Figur 3c zeigt in einer ersten Variante einen Anschluß 46 für die Zuführung der Kraftstoffdämpfe, der in das Gehäuse 39 eingeklipst ist. Dieser Anschluß 46 ist mit einem Tauchrohr 47 versehen und weist ein Filterelement 48 auf, welches ein Austreten von Aktivkohle verhindert. Die Abdichtung des Anschlußes 46 an dem Gehäuse 39 erfolgt über eine O-Ring-Dichtung 49. An der rechten Kammer des Aktivkohlefilters befindet sich ein Anschluß 50 für die Zuführung von Frischluft.FIG. 3 c shows in a first variant a connection 46 for supplying the fuel vapors, which is clipped into the housing 39. This connection 46 is provided with an immersion tube 47 and has a filter element 48 which prevents activated carbon from escaping. The connection 46 is sealed on the housing 39 by means of an O-ring seal 49. A connection 50 for the supply of fresh air is located on the right-hand chamber of the activated carbon filter.

Auch dieser ist in das Gehäuse eingeklipst. Eine zusätzliche Abdichtung ist hier nicht erforderlich.
Eine Variante 2 der Anschlußbefestigung zeigt die Figur 3d. Hier ist der Anschluß 46 mit einem Deckelelement 51 versehen, welches mittels Vibrationsschweißen an das Gehäuse 39 angeschweißt wird. Auch der Anschluß 50 für die Zuführung der Frischluft weist ein Deckelelement 52 auf. Dieses wird ebenfalls mittels Vibrationsschweißen mit dem Gehäuse 39 verbunden.This is also clipped into the housing. An additional seal is not necessary here.
A variant 2 of the connection attachment is shown in FIG. 3d. Here, the connection 46 is provided with a cover element 51, which is welded to the housing 39 by means of vibration welding. The connection 50 for the supply of fresh air also has a cover element 52. This is also connected to the housing 39 by means of vibration welding.

Die Figur 3e stellt in einer dritten Variante eine komplette Abdeckung 53 dar, welche sämtliche Anschlüsse beinhaltet und in einem Arbeitsschritt an das Gehäuse 39 über Vibrationsschweißen befestigt wird.In a third variant, FIG. 3e shows a complete cover 53, which contains all the connections and is fastened to the housing 39 in one work step by means of vibration welding.

Die Aktivkohle 42, 43 innerhalb des Gehäuses 39 ist im unteren Bereich mit einem Filtervlies 44 und im oberen Bereich mit einem Filterschaum 45 abgedeckt. Der Filterschaum 45 hat eine Elastizität die eine gewisse Vorspannung auf die Aktivkohle erzeugt und damit eine Relativbewegung der Aktivkohle bei Erschütterungen oder Schwingungen verhindert.The activated carbon 42, 43 within the housing 39 is covered in the lower area with a filter fleece 44 and in the upper area with a filter foam 45. The filter foam 45 has an elasticity which creates a certain pre-tension on the activated carbon and thus prevents a relative movement of the activated carbon in the event of shocks or vibrations.

In Figur 3a und 3b ist ein Aktivkohlefilter mit zwei Kammern gezeigt. Selbstverständlich besteht die Möglichkeit, dieses Aktivkohlefilter auf vier oder mehr Kammern zu erweitern.An activated carbon filter with two chambers is shown in FIGS. 3a and 3b. Of course there is the possibility to expand this activated carbon filter to four or more chambers.

BezugszeichenlisteReference list

1010th
Gehäusecasing
1111
AnschlußConnection
1212th
AnschlußConnection
1313
AnschlußConnection
1414
Trennwandpartition wall
1515
Bodenground
1616
Trennwandpartition wall
1717th
Kammerchamber
1818th
Kammerchamber
1919th
Kammerchamber
2020th
Kammerchamber
2121
Deckelcover
2222
AktivkohlepaketActivated carbon package
2323
AktivkohlepaketActivated carbon package
2424th
AktivkohlepaketActivated carbon package
2525th
AktivkohlepaketActivated carbon package
2626
Gehäusecasing
2727
Deckelcover
2828
Trennwandpartition wall
2929
Trennwandpartition wall
3030th
Kammerchamber
3131
AktivkohleActivated carbon
3232
FiltervliesmatteFilter fleece mat
3333
Kanälechannels
3434
FilterschaumFilter foam
3535
Kanälechannels
3636
AbstandshalterSpacers
3737
AnschlußflanschConnecting flange
3838
AnschlußflanschConnecting flange
3939
Gehäusecasing
4040
Deckelcover
4141
Kanälechannels
4242
AktivkohleActivated carbon
4343
AktivkohleActivated carbon
4444
FiltervliesFilter fleece
4545
FilterschaumFilter foam
4646
AnschlußConnection
4747
TauchrohrDip tube
4848
FilterelementFilter element
4949
O-RingO-ring
5050
AnschlußConnection
5151
DeckelelementCover element
5252
DeckelelementCover element
5353
Abdeckungcover

Claims (11)

Aktivkohlefilter zur Kraftstofftankentlüftung mit einem ein Aktivkohlepaket aufnehmenden Gehäuse das leitungsmäßig einerseits über einen ersten Anschluß mit dem Kraftstofftank und andererseits über einen zweiten Anschluß mit dem Saugrohr insbesondere eines Verbrennungsmotors sowie über einen dritten Anschluß mit der Atmosphäre in Verbindung steht, dadurch gekennzeichnet, daß in dem Gehäuse eine erste Trennwand angeordnet ist, welche zwischen dem Anschluß für die Atmosphäre und dem Anschluß für den Tank verläuft und das in dem Gehäuse wenigstens eine weitere Trennwand vorgesehen ist, welche wenigstens eine weitere Kammer bildet, wobei wenigstens eine Kammer mit Aktivkohle gefüllt ist.Activated carbon filter for fuel tank ventilation with a housing containing an activated carbon package which is connected to the fuel line via a first connection to the fuel tank on the one hand and to the intake manifold, in particular an internal combustion engine, via a second connection, and to the atmosphere via a third connection, characterized in that in the housing a first partition is arranged which runs between the connection for the atmosphere and the connection for the tank and which is provided in the housing at least one further partition which forms at least one further chamber, at least one chamber being filled with activated carbon. Aktivkohlefilter nach Anspruch 1, dadurch gekennzeichnet, daß wenigstens eine Kammer weitere mechanische Komponenten, wie beispielsweise Ventile aufnimmt.Activated carbon filter according to claim 1, characterized in that at least one chamber accommodates further mechanical components, such as valves. Aktivkohlefilter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Kammern jeweils derart in Verbindung miteinander stehen, daß die Kraftstoffdämpfe nacheinander die mit Aktivkohle befüllten Kammern durchströmen.Activated carbon filter according to claim 1 or 2, characterized in that the chambers are each connected in such a way that the fuel vapors successively flow through the chambers filled with activated carbon. Aktivkohlefilter nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß zwischen der Kammer mit dem Tankanschluß und der Kammer mit dem atmosphärischen Verbindungsanschluß eine verbindungsfreie Trennung vorgesehen ist.Activated carbon filter according to claim 1, 2 or 3, characterized in that a connection-free separation is provided between the chamber with the tank connection and the chamber with the atmospheric connection connection. Aktivkohlefilter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Aktivkohle in der jeweiligen Kammer am Eintritt und am Austritt der durchströmenden Gase mit einem Filterschaum, Filz oder Vlies versehen ist, welcher einen Austrag von Aktivkohle wirksam verhindert.Activated carbon filter according to one of the preceding claims, characterized in that the activated carbon in the respective chamber at the inlet and at the outlet of the gases flowing through is provided with a filter foam, felt or fleece, which effectively prevents the discharge of activated carbon. Aktivkohlefilter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß der Deckel bzw. Boden des Gehäuses mit Kanälen versehen ist, welche ein Durchströmen der Kraftstoffdämpfe ermöglichen und die Kraftstoffdämpfe zur jeweils nächsten Kammer leiten.Activated carbon filter according to one of the preceding claims, characterized in that the cover or bottom of the housing is provided with channels which allow the fuel vapors to flow through and guide the fuel vapors to the next chamber in each case. Aktivkohlefilter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Anschlüsse in das Gehäuse eingerastet bzw. eingeklipst sind.Activated carbon filter according to one of the preceding claims, characterized in that the connections are latched or clipped into the housing. Aktivkohlefilter nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Anschlüsse und/oder der Gehäusedeckel aus Kunststoff bestehen und mit dem Kunststoffgehäuse verschweißt sind.Activated carbon filter according to one of claims 1 to 6, characterized in that the connections and / or the housing cover consist of plastic and are welded to the plastic housing. Aktivkohlefilter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß der Filterschaum, Filz oder Vlies an dem Deckel oder einem Stützkörper durch Kleben oder Anschmelzen des Deckels bzw. Stützkörpers mit diesem verbunden ist.Activated carbon filter according to one of the preceding claims, characterized in that the filter foam, felt or fleece is connected to the cover or a support body by gluing or melting the cover or support body to it. Aktivkohlefilter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die einzelnen Kammern mit Aktivkohle unterschiedlicher Porenstruktur befüllt sind.Activated carbon filter according to one of the preceding claims, characterized in that the individual chambers are filled with activated carbon of different pore structure. Aktivkohlefilter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Kammern unterschiedliche Querschnitte bzw. Längen aufweisen.Activated carbon filter according to one of the preceding claims, characterized in that the chambers have different cross sections or lengths.
EP94104159A 1993-06-19 1994-03-17 Activated carbon filter for purging of a fuel tank Expired - Lifetime EP0631043B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4320384 1993-06-19
DE4320384A DE4320384A1 (en) 1993-06-19 1993-06-19 Activated carbon filter for fuel tank ventilation

Publications (2)

Publication Number Publication Date
EP0631043A1 true EP0631043A1 (en) 1994-12-28
EP0631043B1 EP0631043B1 (en) 1997-09-17

Family

ID=6490727

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94104159A Expired - Lifetime EP0631043B1 (en) 1993-06-19 1994-03-17 Activated carbon filter for purging of a fuel tank

Country Status (13)

Country Link
US (1) US5501723A (en)
EP (1) EP0631043B1 (en)
JP (1) JP2846241B2 (en)
CN (1) CN1035208C (en)
AT (1) ATE158381T1 (en)
BR (1) BR9401783A (en)
CA (1) CA2125592C (en)
CZ (1) CZ286783B6 (en)
DE (2) DE4320384A1 (en)
ES (1) ES2109532T3 (en)
PL (1) PL173386B1 (en)
SI (1) SI9400243A (en)
ZA (1) ZA944036B (en)

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Also Published As

Publication number Publication date
DE59404069D1 (en) 1997-10-23
PL303886A1 (en) 1994-12-27
CZ94894A3 (en) 1995-01-18
US5501723A (en) 1996-03-26
JP2846241B2 (en) 1999-01-13
CN1035208C (en) 1997-06-18
CA2125592A1 (en) 1994-12-20
DE4320384A1 (en) 1994-12-22
CA2125592C (en) 2000-11-07
JPH0771337A (en) 1995-03-14
ES2109532T3 (en) 1998-01-16
ZA944036B (en) 1995-02-02
PL173386B1 (en) 1998-02-27
ATE158381T1 (en) 1997-10-15
CN1098369A (en) 1995-02-08
BR9401783A (en) 1995-01-17
EP0631043B1 (en) 1997-09-17
SI9400243A (en) 1995-02-28
CZ286783B6 (en) 2000-07-12

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