WO2004041407A1 - Filter element - Google Patents

Filter element Download PDF

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Publication number
WO2004041407A1
WO2004041407A1 PCT/EP2003/011778 EP0311778W WO2004041407A1 WO 2004041407 A1 WO2004041407 A1 WO 2004041407A1 EP 0311778 W EP0311778 W EP 0311778W WO 2004041407 A1 WO2004041407 A1 WO 2004041407A1
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WO
WIPO (PCT)
Prior art keywords
folds
support tube
fold
filter element
filter
Prior art date
Application number
PCT/EP2003/011778
Other languages
German (de)
French (fr)
Inventor
Andreas Schunk
Original Assignee
Hydac Filtertechnik Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hydac Filtertechnik Gmbh filed Critical Hydac Filtertechnik Gmbh
Publication of WO2004041407A1 publication Critical patent/WO2004041407A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/12—Pleated filters
    • B01D2201/122—Pleated filters with pleats of different length

Definitions

  • the invention relates to a filter element in the form of a filter cylinder, which is formed from a sequence of adjacent, longitudinally extending folds of filter material, which are located within the space between an inner fluid-permeable support tube surrounded by the filter element and an outer lateral surface extend that the longitudinal, radially outer fold backs adjoin the outer lateral surface, some of the folds with their longitudinal, radially inner fold backs adjoin the support tube and at least another part of the folds with their longitudinal, radially inner fold back extends at a distance from the inner support tube, the sequence of the folds being chosen so that each fold, which extends over the entire radial extent of the intermediate space from the outer circumferential surface to the inner support tube, has a respective company lte follows, the radially inner fold back of which is located at the mentioned distance from the inner support tube and which in turn is immediately followed by a fold extending over the entire radial extent of the intermediate space.
  • Filter elements of the type mentioned above are commercially available and are found, for example, in hydraulic systems in Hydraulic oils flowing through system branches are widely used.
  • the known filter elements are not entirely satisfactory with regard to their operational safety and the stability of the beta value which is decisive for the filter performance.
  • Such impairments and / or deformations of the folds are referred to here with the general expression “bulges of the folds”.
  • the invention has for its object to provide a filter element which is distinguished from the prior art by improved operational reliability and better beta value stability, even at high flow rates.
  • this object is achieved according to the invention in that in the case of the folds whose radially inner fold backs are at the mentioned distance from the support tube, this distance is large in each case.
  • the space available between the inner support tube and the outer lateral surface can be optimally used.
  • the filter cylinder is designed with a relatively large pleat height in relation to the diameter of the inner support tube
  • the outwardly diverging gusset between two adjacent high pleats is optimally utilized by the pleat of smaller height lying between them.
  • the folds of lesser height protrude so far into the gusset between the adjacent higher folds so that they just touch them. This not only results in an optimal utilization of the volume between the inner support tube and the outer jacket surface due to the filter material built into this volume and a significantly enlarged filter surface, but the high folds are additionally supported.
  • the fold height of the folds of lesser height is approximately 2/3 of the radial extent of the space between the inner support tube and the outer jacket surface.
  • the outer lateral surface can be formed by a fluid-permeable outer support tube surrounding the filter element.
  • a multi-layer filter mat web is provided as the filter material, this can have an outer support that forms the outer lateral surface in the form of a lattice or woven structure.
  • the multilayer filter mat web can have a metallic grid as the outer support forming the outer lateral surface.
  • FIG. 1 is a perspective view of the filter cylinder of an exemplary embodiment of the filter element according to the invention.
  • FIG. 2 shows a highly schematically simplified and broken partial plan view of the filter cylinder from FIG. 1 to illustrate the fold arrangement of the filter material.
  • the figures show a filter element in the form of a filter cylinder 1, which is formed from a folded filter mat web, the two ends of which are joined together at a connecting seam 3, in the exemplary embodiment by welding, so that the filter cylinder 1 represents a closed ring body.
  • the fold arrangement is constructed in such a way that folds 5 of larger, radially measured fold height H alternate with folds 7 of lower fold height, namely 2/3 H, in direct succession.
  • the radially outer fold backs 17 lie on all folds 5 and 7 on the same radius, ie they adjoin an outer lateral surface, which is only indicated in FIG. 2 and is designated by 9. Of the folds 5 and 7, only the longitudinal fold backs 6 of the higher folds 5 are in contact with an inner support tube, which is only indicated in FIG. 2 and is denoted by 1 1.
  • the radially inner fold backs 15 (FIG. 2) of the folds 7 with a smaller fold height are also each at the same radius, which is designated 13 in FIG. 2, the fold height of these folds 7 in the present example 2/3 of the fold height of the folds 5 is. As can be clearly seen from FIG.
  • the folds 7 of lower height make use of the gusset-like, slightly outwardly widening space between neighboring folds 5 of greater height, in the region of their radially inner fold back 15 each resting on the side flanks of the adjacent folds 5 , so that a pleat composite is formed which, despite the large filter area, offers the desired buckling protection even at higher differential pressures.
  • the fold height of the folds is 7 2/3 of the height H of the folds 5. It goes without saying that, depending on the ratio of the diameter of the inner support tube 11 and the outer jacket surface 9, other values for the distance between the radially inner fold backs 15 of the folds Folds 7 and the inner support tube 1 1 can be selected in order to achieve the desired utilization of the space between the support tube 1 1 and the outer surface 9 with good mutual support of the folds 5 and 7.
  • the filter mat web is preferably formed by a flexible mat structure made of metal-free, plastic-supported filter mats, the connection of the ends of the filter mat web, whereby a closed ring body is formed, being produced by a weld seam 3.
  • a six-layer structure of the filter mat web which has the following layers in succession: an outer support, a protective fleece, a pre-filter layer, a main filter layer, a support fleece and an inner support.
  • a polyamide grid or a polyester fabric can be used for the external support.
  • This outer support can form the outer lateral surface 9 for the contact of the radially outer fold back 17.
  • the outer Lateral surface 9 by a fluid-permeable outer support tube (not Darge ⁇ represents) may be formed.

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

Abstract

The invention relates to a filter element in the form of a filter cylinder (1) formed by a series of adjacent folds (5 and 7) of filter material extending in the longitudinal direction, said folds extending inside the intermediate region between a liquid-permeable, inner support tube (11) surrounded by the filter element and an outer envelope surface (9), in such a way that the longitudinally extending, radially outer fold ends (17) are adjacent to the outer envelope surface (9), part (5) of the folds are adjacent to the support tube (11), at the region of the longitudinally extending, radially inner fold ends (6) thereof, and the longitudinally extending, radially inner fold ends (15) of at least another part (7) of the folds are located at a distance from the inner support tube. According to the invention, the sequence of the folds (5 and 7) is selected such that each fold (5) extending over the entire radial extension of the intermediate region, from the outer envelope surface (9) to the inner support tube (11), is followed by respectively one fold (7) which has a radially inner fold end (15) located at the cited distance from the inner support tube (11), and which is followed, in turn, by a fold (5) extending over the entire radial extension of the intermediate region.

Description

Filterelement filter element
Die Erfindung bezieht sich auf ein Filterelement in Form eines Filterzylinders, der aus einer Folge von nebeneinander liegenden, sich in Längsrichtung erstreckenden Falten von Filtermaterial gebildet ist, die sich innerhalb des Zwischenraumes zwischen einem vom Filterelement umgebenen inne- ren fluiddurchlassigen Stützrohr und einer äußeren Mantelfläche so erstrek- ken, dass die längs verlaufenden, radial außenliegenden Faltenrücken an die äußere Mantelfläche angrenzen, ein Teil der Falten mit ihren längs verlaufenden, radial innenliegenden Faltenrücken an das Stützrohr angrenzt und zumindest ein weiterer teil der Falten sich mit ihren längs verlaufen- den, radial innenliegenden Faltenrücken in einem Abstand vom inneren Stützrohr erstreckt, wobei die Abfolge der Falten so gewählt ist, dass auf jede Falte, die sich über die gesamte radiale Erstreckung des Zwischenraumes von der äußeren Mantelfläche bis zum inneren Stützrohr erstreckt, je- weils unmittelbar eine Falte folgt, deren radial innenliegender Faltenrücken sich in dem erwähnten Abstand vom inneren Stützrohr befindet und auf die wiederum eine sich über die gesamte radiale Erstreckung des Zwischenraumes erstreckende Falte unmittelbar folgt.The invention relates to a filter element in the form of a filter cylinder, which is formed from a sequence of adjacent, longitudinally extending folds of filter material, which are located within the space between an inner fluid-permeable support tube surrounded by the filter element and an outer lateral surface extend that the longitudinal, radially outer fold backs adjoin the outer lateral surface, some of the folds with their longitudinal, radially inner fold backs adjoin the support tube and at least another part of the folds with their longitudinal, radially inner fold back extends at a distance from the inner support tube, the sequence of the folds being chosen so that each fold, which extends over the entire radial extent of the intermediate space from the outer circumferential surface to the inner support tube, has a respective company lte follows, the radially inner fold back of which is located at the mentioned distance from the inner support tube and which in turn is immediately followed by a fold extending over the entire radial extent of the intermediate space.
Filterelemente der vorstehend genannten Art (vergleiche WO 00/40319) sind handelsüblich und finden beispielsweise bei Hydraulikanlagen in von Hydraulikölen durchströmten Systemzweigen verbreitete Anwendung. Die bekannten Filterelemente sind hinsichtlich ihrer Betriebssicherheit und der Stabilität des für die Filterleistung maßgebenden Beta-Wertes nicht völlig zufriedenstellend. Insbesondere bei hohen Durchflußleistungen besteht die Gefahr, dass es aufgrund des Fluid-Differenzdruckes zu Verformungen oder Beschädigungen der Faltenanordnung kommt. Solche Beeinträchtigungen und/oder Verformungen der Falten sind hier mit dem allgemeinen Ausdruck „Beulen der Falten" bezeichnet.Filter elements of the type mentioned above (compare WO 00/40319) are commercially available and are found, for example, in hydraulic systems in Hydraulic oils flowing through system branches are widely used. The known filter elements are not entirely satisfactory with regard to their operational safety and the stability of the beta value which is decisive for the filter performance. In particular at high flow rates, there is a risk that the fluid differential pressure will cause deformation or damage to the fold arrangement. Such impairments and / or deformations of the folds are referred to here with the general expression “bulges of the folds”.
Der Erfindung liegt die Aufgabe zugrunde, ein Filterelement zu schaffen, das sich gegenüber dem Stand der Technik durch eine verbesserte Betriebssicherheit und bessere Beta-Wert Stabilität, selbst bei hohen Durchflußleistungen, auszeichnet.The invention has for its object to provide a filter element which is distinguished from the prior art by improved operational reliability and better beta value stability, even at high flow rates.
Bei einem Filterelement der eingangs genannten Art ist diese Aufgabe erfindungsgemäß dadurch gelöst, dass bei den Falten, deren radial innenliegende Faltenrücken den erwähnten Abstand vom Stützrohr aufweisen, dieser Abstand jeweils groß ist.In the case of a filter element of the type mentioned at the outset, this object is achieved according to the invention in that in the case of the folds whose radially inner fold backs are at the mentioned distance from the support tube, this distance is large in each case.
Bei der erfindungsgemäßen Faltenanordnung, bei der in unmittelbarer Aufeinanderfolge sich Falten großer Faltenhöhe (d. h. radialer Erstreckung) jeweils mit Falten geringerer Höhe abwechseln, läßt sich der zwischen innerem Stützrohr und äußerer Mantelfläche zur Verfügung stehende Raum optimal ausnutzen. Insbesondere bei Ausbildung des Filterzylinders mit ver- hältnismäßig großer Faltenhöhe im Verhältnis zum Durchmesser des inneren Stützrohres, wird der nach außen divergierende Zwickel zwischen zwei benachbarten hohen Falten von der dazwischen liegenden Falte geringerer Höhe bestmöglich ausgenutzt. Bei geeigneter Wahl der radial gemessenen Höhendifferenz ragen die Falten geringerer Höhe so weit in den Zwickel zwischen den angrenzenden höheren Falten hinein, dass sie diese gerade berühren. Dadurch ergibt sich nicht nur eine optimale Ausnutzung des Volumens zwischen innerem Stützrohr und äußerer Mantelfläche durch das in dieses Volumen eingebaute Filtermaterial und eine dadurch deutlich ver- größerte Filterfläche, sondern die hohen Falten werden zusätzlich abgestützt.In the case of the fold arrangement according to the invention, in which folds of large fold height (ie radial extension) alternate with folds of lower height in direct succession, the space available between the inner support tube and the outer lateral surface can be optimally used. Particularly when the filter cylinder is designed with a relatively large pleat height in relation to the diameter of the inner support tube, the outwardly diverging gusset between two adjacent high pleats is optimally utilized by the pleat of smaller height lying between them. With a suitable choice of the radially measured height difference, the folds of lesser height protrude so far into the gusset between the adjacent higher folds so that they just touch them. This not only results in an optimal utilization of the volume between the inner support tube and the outer jacket surface due to the filter material built into this volume and a significantly enlarged filter surface, but the high folds are additionally supported.
Als Ergebnis wird beim erfindungsgemäßen Filterelement selbst bei hohen Durchflußleistungen eine hohe Sicherheit gegen Beulen der Falten gewähr- leistet, so dass die erstrebte hohe Betriebssicherheit und Beta-Wert Stabilität erreicht ist.As a result, with the filter element according to the invention, a high level of security against buckling of the folds is ensured even at high flow rates, so that the desired high level of operational reliability and stability of the beta value are achieved.
Bei bevorzugten Beispielen beträgt die Faltenhöhe der Falten geringerer Höhe etwa 2/3 der radialen Erstreckung des Zwischenraumes zwischen in- nerem Stützrohr und äußerer Mantelfläche.In preferred examples, the fold height of the folds of lesser height is approximately 2/3 of the radial extent of the space between the inner support tube and the outer jacket surface.
Die äußere Mantelfläche kann durch ein das Filterelement umgebendes fluiddurchlässiges äußeres Stützrohr gebildet sein.The outer lateral surface can be formed by a fluid-permeable outer support tube surrounding the filter element.
Wenn als Filtermaterial eine mehrlagig aufgebaute Filtermattenbahn vorgesehen ist, kann diese eine die äußere Mantelfläche bildende äußere AbStützung in Form einer Gitter- oder Gewebestruktur aufweisen.If a multi-layer filter mat web is provided as the filter material, this can have an outer support that forms the outer lateral surface in the form of a lattice or woven structure.
Hierbei kann es sich um eine Gitter- oder Gewebestruktur auf Polyamid- oder Polyesterbasis handeln. Alternativ kann die mehrlagige Filtermattenbahn ein metallisches Gitter als die äußere Mantelfläche bildende äußere Abstützung aufweisen. Nachstehend ist die Erfindung anhand der Zeichnung im einzelnen erläutert. Es zeigen:This can be a lattice or fabric structure based on polyamide or polyester. Alternatively, the multilayer filter mat web can have a metallic grid as the outer support forming the outer lateral surface. The invention is explained in detail below with reference to the drawing. Show it:
• Fig. 1 eine perspektivische Ansicht des Filterzylinders eines Ausfüh- rungsbeispieles des erfindungsgemäßen Filterelementes und1 is a perspective view of the filter cylinder of an exemplary embodiment of the filter element according to the invention and
• Fig. 2 eine stark schematisch vereinfacht und abgebrochen dargestellte Teildraufsicht des Filterzylinders von Fig. 1 zur Verdeutlichung der Faltenanordnung des Filtermaterials.• FIG. 2 shows a highly schematically simplified and broken partial plan view of the filter cylinder from FIG. 1 to illustrate the fold arrangement of the filter material.
Die Fig. zeigen ein Filterelement in Form eines Filterzylinders 1 , der aus einer gefalteten Filtermattenbahn gebildet ist, deren beide Enden an einer Verbindungsnaht 3, und zwar im Ausführungsbeispiel durch Verschweißen, miteinander vereinigt sind, so dass der Filterzylinder 1 einen geschlossenen Ringkörper darstellt. Wie insbesondere aus Fig. 2 ersichtlich ist, ist die Fal- tenanrodnung so aufgebaut, dass sich Falten 5 größerer, radial gemessener Faltenhöhe H mit Falten 7 geringerer Faltenhöhe, nämlich 2/3 H, in unmittelbarer Aufeinanderfolge abwechseln.The figures show a filter element in the form of a filter cylinder 1, which is formed from a folded filter mat web, the two ends of which are joined together at a connecting seam 3, in the exemplary embodiment by welding, so that the filter cylinder 1 represents a closed ring body. As can be seen in particular from FIG. 2, the fold arrangement is constructed in such a way that folds 5 of larger, radially measured fold height H alternate with folds 7 of lower fold height, namely 2/3 H, in direct succession.
Die radial außenliegenden Faltenrücken 17 (Fig. 2) liegen bei sämtlichen Falten 5 und 7 auf dem gleichen Radius, d. h. sie grenzen an eine äußere Mantelfläche an, die lediglich in Fig. 2 angedeutet und mit 9 bezeichnet ist. Von den Falten 5 und 7 befinden sich lediglich die längs verlaufenden Faltenrücken 6 der höheren Falten 5 in Anlage an einem inneren Stützrohr, das lediglich in Fig. 2 zeichnerisch angedeutet und mit 1 1 bezeichnet ist. Die radial innenliegenden Faltenrücken 15 (Fig. 2) der Falten 7 geringerer Faltenhöhe befinden sich ebenfalls auf jeweils gleichem Radius, der in Fig. 2 mit 13 bezeichnet ist, wobei die Faltenhöhe dieser Falten 7 beim vorliegenden Beispiel 2/3 der Faltenhöhe der Falten 5 beträgt. Wie aus Fig. 2 deutlich entnehmbar ist, nutzen die Falten 7 geringerer Höhe den zwickelartigen, sich nach außen leicht erweiternden Raum zwischen benachbarten Falten 5 größerer Höhe aus, wobei sie im Bereich ihrer radial innenliegenden Faltenrücken 15 jeweils an den Seitenflanken der angrenzenden Falten 5 anliegen, so dass ein Faltenverbund gebildet ist, der trotz großer Filterfläche die gewünschte Beulsicherheit selbst bei höheren Differenzdrücken bietet.The radially outer fold backs 17 (FIG. 2) lie on all folds 5 and 7 on the same radius, ie they adjoin an outer lateral surface, which is only indicated in FIG. 2 and is designated by 9. Of the folds 5 and 7, only the longitudinal fold backs 6 of the higher folds 5 are in contact with an inner support tube, which is only indicated in FIG. 2 and is denoted by 1 1. The radially inner fold backs 15 (FIG. 2) of the folds 7 with a smaller fold height are also each at the same radius, which is designated 13 in FIG. 2, the fold height of these folds 7 in the present example 2/3 of the fold height of the folds 5 is. As can be clearly seen from FIG. 2, the folds 7 of lower height make use of the gusset-like, slightly outwardly widening space between neighboring folds 5 of greater height, in the region of their radially inner fold back 15 each resting on the side flanks of the adjacent folds 5 , so that a pleat composite is formed which, despite the large filter area, offers the desired buckling protection even at higher differential pressures.
Beim gezeigten Beispiel beträgt die Faltenhöhe der Falten 7 2/3 der Höhe H der Falten 5. Es versteht sich, dass je nach Verhältnis der Durchmesser von innerem Stützrohr 1 1 und äußerer Mantelfläche 9 andere Werte für den Abstand zwischen den radial innenliegenden Faltenrücken 15 der Falten 7 und dem inneren Stützrohr 1 1 gewählt sein können, um die gewünschte Ausnutzung des Zwischenraumes zwischen Stützrohr 1 1 und Mantelfläche 9 bei guter gegenseitiger Abstützung der Falten 5 und 7 zu erreichen.In the example shown, the fold height of the folds is 7 2/3 of the height H of the folds 5. It goes without saying that, depending on the ratio of the diameter of the inner support tube 11 and the outer jacket surface 9, other values for the distance between the radially inner fold backs 15 of the folds Folds 7 and the inner support tube 1 1 can be selected in order to achieve the desired utilization of the space between the support tube 1 1 and the outer surface 9 with good mutual support of the folds 5 and 7.
Vorzugsweise ist die Filtermattenbahn durch einen flexiblen Mattenaufbau aus metallfreien, kunststoffgestützten Filtermatten gebildet, wobei die Verbindung der Enden der Filtermattenbahn, wodurch ein geschlossener Ring- körper gebildet wird, durch eine Schweißnaht 3 hergestellt ist.The filter mat web is preferably formed by a flexible mat structure made of metal-free, plastic-supported filter mats, the connection of the ends of the filter mat web, whereby a closed ring body is formed, being produced by a weld seam 3.
Bei einem bevorzugten Beispiel ist ein sechslagiger Aufbau der Filtermattenbahn vorgesehen, die in Aufeinanderfolge folgende Lagen aufweist: Eine äußere Abstützung, ein Schutzvlies, eine Vorfilterlage, eine Hauptfilterlage, ein Stützvlies und eine innere Abstützung. Für die äußere Abstützung kommen ein Polyamidgitter oder ein Polyestergewebe in Frage. Diese äußere Abstützung kann die äußere Mantelfläche 9 für die Anlage der radial äußeren Faltenrücken 17 bilden. Stattdessen oder zusätzlich kann die äußere Mantelfläche 9 durch ein fluiddurchlässiges äußeres Stützrohr (nicht darge¬ stellt) gebildet sein. In a preferred example, a six-layer structure of the filter mat web is provided, which has the following layers in succession: an outer support, a protective fleece, a pre-filter layer, a main filter layer, a support fleece and an inner support. A polyamide grid or a polyester fabric can be used for the external support. This outer support can form the outer lateral surface 9 for the contact of the radially outer fold back 17. Instead or in addition, the outer Lateral surface 9 by a fluid-permeable outer support tube (not Darge ¬ represents) may be formed.

Claims

P a t e n t a n s p r ü c h eP a t e n t a n s r u c h e
. Filterelement in Form eines Filterzylinders (1), der aus einer Folge von nebeneinander liegenden, sich in Längsrichtung erstreckenden Falten (5 und 7) von Filtermaterial gebildet ist, die sich innerhalb des Zwischenraumes zwischen einem vom Filterelement umgebenen inneren, fluiddurchlassigen Stützrohr (1 1) und einer äußeren Mantelfläche (9) so erstrecken, dass die längs verlaufenden, radial außenliegenden Faltenrük- ken (17) an die äußere Mantelfläche (9) angrenzen, ein Teil (5) der Fal- ten mit ihren längs verlaufenden, radial innenliegenden Faltenrücken (6) an das Stützrohr (1 1 ) angrenzt und zumindest ein weiterer Teil (7) der Falten sich mit ihren längs verlaufenden, radial innenliegenden Faltenrücken (15) in einem Abstand vom inneren Stützrohr (1 1 ) erstreckt, wobei die Abfolge der Falten (5 und 7) so gewählt ist, dass auf jede Falte (5), die sich über die gesamte radiale Erstreckung des Zwischenraumes von der äußeren Mantelfläche (9) bis zum inneren Stützrohr (1 1 ) erstreckt, jeweils unmittelbar eine Falte (7) folgt, deren radial innenliegender Faltenrücken (15) sich in dem erwähnten Abstand vom inneren Stützrohr (1 1) befindet und auf die wiederum eine sich über die gesamte radiale Erstreckung des Zwischenraumes erstreckende Falte (5) unmittelbar folgt, dadurch gekennzeichnet, dass bei den Falten (7), deren radial innenliegende Faltenrücken (15) den erwähnten Abstand vom Stützrohr (1 1) aufweisen, dieser Abstand jeweils gleich groß ist., Filter element in the form of a filter cylinder (1), which is formed from a sequence of adjacent, longitudinally extending folds (5 and 7) of filter material, which are located within the space between an inner, fluid-permeable support tube (1 1) surrounded by the filter element and an outer lateral surface (9) so that the longitudinally extending, radially outer fold backs (17) adjoin the outer lateral surface (9), part (5) of the folds with their longitudinally running, radially inner fold backs ( 6) adjoins the support tube (1 1) and at least a further part (7) of the folds extends with its longitudinal, radially inner fold back (15) at a distance from the inner support tube (1 1), the sequence of folds ( 5 and 7) is selected so that on each fold (5), which extends over the entire radial extent of the space from the outer lateral surface (9) to the inner support zrohr (1 1), each immediately follows a fold (7), the radially inner fold back (15) is located at the distance mentioned from the inner support tube (1 1) and which in turn extends over the entire radial extent of the space Fold (5) follows immediately, characterized in that in the case of the folds (7) whose radially inner fold backs (15) have the aforementioned distance from the support tube (11), this distance is in each case the same size.
2. Filterelement nach Anspruch 1 , dadurch gekennzeichnet, dass der Abstand der radial innenliegenden Faltenrücken (15) vom Stützrohr (1 1 ) weniger als die Hälfte der radialen Erstreckung zwischen Mantelfläche (9) und Stützrohr (1 1 ), vorzugsweise näherungsweise ein Drittel dieser Erstreckung beträgt. 2. Filter element according to claim 1, characterized in that the distance of the radially inner fold back (15) from the support tube (1 1) less than half the radial extent between the outer surface (9) and support tube (1 1), preferably approximately a third of these Extent is.
3. Filterelement nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die äußere Mantelfläche (9) durch ein das Filterelement umgebendes, fluiddurchlässiges äußeres Stützrohr gebildet ist.3. Filter element according to claim 1 or 2, characterized in that the outer lateral surface (9) is formed by a fluid-permeable outer support tube surrounding the filter element.
4. Filterelement nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass als Filtermaterial eine mehrlagig aufgebaute Filtermatten bahn vorgesehen ist.4. Filter element according to one of claims 1 to 3, characterized in that a multi-layer filter mat web is provided as the filter material.
5. Filterelement nach Anspruch 4, dadurch gekennzeichnet, dass die Filtermattenbahn eine die äußere Mantelfläche (9) bildende äußere Abstützung in Form einer Gitter- oder Gewebestruktur aufweist.5. Filter element according to claim 4, characterized in that the filter mat web has an outer support (9) forming outer support in the form of a lattice or fabric structure.
6. Filterelement nach Anspruch 5, dadurch gekennzeichnet, dass die die äußere Mantelfläche (9) bildende Gitter- oder Gewebestruktur auf Polyamid- oder Polyesterbasis ausgeführt ist.6. Filter element according to claim 5, characterized in that the outer jacket surface (9) forming lattice or fabric structure is based on polyamide or polyester.
7. Filterelement nach Anspruch 5, dadurch gekennzeichnet, dass die mehrlagige Filtermattenbahn ein metallisches Gitter als die äußere Mantelflä- ehe (9) bildende äußere Abstützung aufweist. 7. Filter element according to claim 5, characterized in that the multilayer filter mat web has a metallic grid as the outer mantle surface (9) forming outer support.
PCT/EP2003/011778 2002-11-02 2003-10-24 Filter element WO2004041407A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10250969.7 2002-11-02
DE2002150969 DE10250969A1 (en) 2002-11-02 2002-11-02 Filter cylinder for hydraulic oil, in a hydraulic system, has a pleated structure with pleat folds covering the radial gap between the outer mantle and inner tube and shorter intermediate folds

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WO2004041407A1 true WO2004041407A1 (en) 2004-05-21

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004061078A1 (en) * 2004-12-18 2006-06-29 Hydac Filtertechnik Gmbh Filter component for filter element in form of filter cylinder comprises further structural layer arranged on one of upper sides of first structural layer or between them
WO2007052563A1 (en) 2005-10-31 2007-05-10 Nippon Rokaki Co.,Ltd. Filter device and filtration body
US7759815B2 (en) 2004-12-17 2010-07-20 Nordex Energy Gmbh Wind motor with a holding device for a rotor shaft
WO2014075702A1 (en) * 2012-11-14 2014-05-22 Hydac Filtertechnik Gmbh Filter element
CN111085025A (en) * 2018-10-24 2020-05-01 帕尔公司 Support and drainage material, filter and method of use

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DE102004005202A1 (en) 2004-02-03 2005-08-25 Hydac Filtertechnik Gmbh filter element
DE102004055845B4 (en) * 2004-11-19 2006-08-24 Zander Aufbereitungstechnik Gmbh & Co. Kg Hollow-cylindrical filter element for liquid or gaseous media
FR2889079B1 (en) 2005-07-29 2007-11-02 Vallee De L Aigues S I V A Sar FILTRATION DEVICE INCORPORATING A LOOP AND A CIRCULATION PUMP
DE102016011754A1 (en) 2016-09-30 2018-04-05 Mann+Hummel Gmbh filter element
DE102018101804A1 (en) * 2018-01-26 2019-08-01 Sartorius Stedim Biotech Gmbh filter module

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FR2791579A1 (en) * 1999-04-02 2000-10-06 Albrecht Philippe Oil or fuel filter cartridge for e.g. vehicle, has annular plastic joint molded over each end face of cylindrical filter element, with rigid layer molded over element and flexible resilient hub
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US3799354A (en) * 1972-03-11 1974-03-26 Gen Motors Corp Fluid filter elements
JPS6061017A (en) * 1983-09-12 1985-04-08 Nippon Denso Co Ltd Manufacture of filter element for fluid
JPS60238111A (en) * 1984-05-11 1985-11-27 Nippon Rokaki Kk Filter element
EP0504038A1 (en) * 1991-03-13 1992-09-16 Filtrauto Filter cartridges with pleated filter element
DE4414960A1 (en) * 1993-04-30 1994-11-03 Dana Corp Air filter
FR2791579A1 (en) * 1999-04-02 2000-10-06 Albrecht Philippe Oil or fuel filter cartridge for e.g. vehicle, has annular plastic joint molded over each end face of cylindrical filter element, with rigid layer molded over element and flexible resilient hub
WO2002022230A2 (en) * 2000-09-15 2002-03-21 Cuno Incorporated Spiral pleated filter cartridges

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7759815B2 (en) 2004-12-17 2010-07-20 Nordex Energy Gmbh Wind motor with a holding device for a rotor shaft
DE102004061078A1 (en) * 2004-12-18 2006-06-29 Hydac Filtertechnik Gmbh Filter component for filter element in form of filter cylinder comprises further structural layer arranged on one of upper sides of first structural layer or between them
DE102004061078B4 (en) * 2004-12-18 2007-09-06 Hydac Filtertechnik Gmbh filter component
WO2007052563A1 (en) 2005-10-31 2007-05-10 Nippon Rokaki Co.,Ltd. Filter device and filtration body
EP1952869A1 (en) * 2005-10-31 2008-08-06 Nippon Rokaki Co., Ltd. Filter device and filtration body
EP1952869A4 (en) * 2005-10-31 2009-11-04 Nippon Rokaki Co Ltd Filter device and filtration body
WO2014075702A1 (en) * 2012-11-14 2014-05-22 Hydac Filtertechnik Gmbh Filter element
WO2014075703A1 (en) * 2012-11-14 2014-05-22 Rt-Filtertechnik Gmbh Filter element and hydraulic circuit with such a filter element
US20150290562A1 (en) * 2012-11-14 2015-10-15 RT- Filtertechnik GmbH Filter element and hydraulic circuit with such a filter element
US10213709B2 (en) * 2012-11-14 2019-02-26 Rt-Filtertechnik Gmbh Filter element and hydraulic circuit with such a filter element
US10478759B2 (en) 2012-11-14 2019-11-19 Rt-Filtertechnik Gmbh Filter element
US11033838B2 (en) 2012-11-14 2021-06-15 Hydac Filtertechnik Gmbh Filter element
EP4094819A1 (en) * 2012-11-14 2022-11-30 Hydac Filtertechnik GmbH Filter element
CN111085025A (en) * 2018-10-24 2020-05-01 帕尔公司 Support and drainage material, filter and method of use
CN111085025B (en) * 2018-10-24 2021-12-17 帕尔公司 Support and drainage material, filter and method of use

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