DE102019102172A1 - Filter element and filter system - Google Patents

Abstract

The invention relates to a filter element, in particular a flat filter element (10) for filtering a fluid, comprising at least one filter bellows (12) having a designated raw side (50) and a designated clean side (52) opposite the intended one, wherein the filter bellows (12) revolve is surrounded by a the end edges (22, 23) of the filter bellows (12) sealing frame (28), with a laterally from the frame (28) outwardly projecting, seal-carrying web (31), wherein the web (31) has a first Partial region (31-1) which is arranged at an angle to a side wall (29) of the frame (28), wherein the angle (α) is selected from a range of 0 ° to 180 °, with respect to the side wall (29 ) of the frame (28) on which the web (31) is arranged, wherein the edge of the side wall (29) of the frame (28) defines the 0 ° angle at the intended clean side and the edge of the side wall (29) of the frame (29) 28) on the intended the raw side (52) defines the 180 ° angle, and a second partial region (31-2) which is formed in the direction of force introduction (48), wherein in the second partial region (31-2) of the web (31) there is a compression region (45) , which adjoins the first portion (31-1) of the web (31), and openings (30) are provided, wherein the openings (30) in the region of an outer edge (32), in particular along the outer edge (32) of the second Section (31-2) of the web (31) extend, wherein a web (31) circumferential radial seal (40) is provided and sealing material of the radial seal (40) through the openings (30), and at least one sealing surface (42, 44) of the radial seal (40) with respect to a flat side of the Verpressbereichs (45) of the second portion (31-2) of the web (31) arranged axially in the opposite direction to the force introduction direction (48) spaced from the Verpressbereich (45) of the web (31) The invention further relates to a filter system (100) with Such a replaceable filter element (10).

Description

Technical area

The invention relates to a filter element for filtering a fluid, in particular for use for cassette air filter of an internal combustion engine or as an interior air filter, in particular a motor vehicle and a filter system with a filter element.

State of the art

For example, to filter fluids such as fuels, other equipment, or indoor air in the automotive field, pleated or pleated filter media are often used. It is often necessary to support the fold profiles by means of aids, so that the shape is retained even when passing through the fluid. Furthermore, it is desirable to seal the filter elements at their edges against the filter holder or the respective filter housing so that no unfiltered fluid can flow past the pleated filter medium.

In DE 10 2009 056 511 A1 is disclosed a filter element, which is in particular an interior air filter for a motor vehicle. The filter element has a folded filter bellows, a plastic frame injected at least partially onto the filter bellows and a plastic foam seal foamed at least partially on the plastic frame, for example a foam seal, for example of polyurethane (PUR).

The plastic frame molded onto the filter bellows serves, for example, to support fold profiles of the filter bellows. Furthermore, the plastic frame injection-molded onto the filter bellows can serve for lateral sealing, for example, with respect to a filter receptacle.

The plastic frame and the plastic foam seal are produced in an injection molding process. By spraying the plastic frame, which is sufficiently rigid to give stability to the filter bellows, one achieves a sufficiently strong connection with the folding profiles. By injecting the plastic foam seal, for example by a reaction injection molding, any shapes for frame and radial seal can be realized. However, not all material combinations are suitable for the connection of plastic frames and plastic seals, in particular molded seals or foamed seals. For example, a, in particular thermoplastic, plastic frame, for example a polypropylene (PP) frame due to the surface energy requires a surface treatment, for example by ionization, plasma treatment or corona process, so that a plastic seal, such as a foamed or molded seal, for example made of polyurethane sufficiently safe adheres to the surface of the plastic frame, or it is alternatively a mechanical adhesion between the plastic frame and the foam seal necessary.

CN 102 380 272 A shows such a mechanical anchoring of the foam seal to a web on a frame, wherein the web has openings and wherein the axial seal of the CN 102 380 272 A is mechanically anchored to the frame by means of the openings and additional lateral cutouts on the frame. The axial seal of the CN 102 380 272 A has in this case an axially sealing sealing bead, which viewed from the filter element radially outwardly in the region of the outer edge of the web and viewed from the outer edge of the web is arranged in front of the openings in the web. This has the disadvantage that leaks are possible along the web at the interface between sealing media passing through the openings and the land surface, so that raw air can flow to the clean side along this interface. In the mechanical anchoring of the axial seal of the CN 102 380 272 A in which the sealing bead is arranged in front of the openings, moreover the sealing force at the location of the anchoring by means of the passage of the sealing material through an opening in the web is not uniformly distributed or homogeneous, since the sealing material does not have the same rigidity as the material of the web, so that the sealing force of the sealing material in cooperation with the web is different from the sealing force of the pure sealing material in the region of the opening.

DE 100 58 478 A1 is directed to providing a flat filter element having a low cost manufacturable and aging resistant seal for installation in the housing. This is off DE 100 58 478 A1 a filter element is known, comprising a bellows and a seal surrounding the bellows of a V-profile, which is molded into a frame, said holes in the V-profile of the seal for reliable support in the frame, since they are filled by the material of the frame become.

Disclosure of the invention

An object of the invention is to provide a filter element for filtering a fluid, in particular for air filtering, in particular for Motoransaugluftfilterung, or Gebäudeluftfilterung or Innenraumluftfilterung, in which structurally simple a seal which is secured by mechanical anchoring to a plastic frame without an additional surface treatment to require the plastic frame, and also at the Interface of the mechanical anchoring the particular uniform tightness is secured when used in a filter housing. It is a further object to provide such a filter element with a radial seal in which the sealing force of the sealing material is uniformly distributed in cooperation with the web of the frame of the filter element and in particular the anchoring is decoupled from the sealing force.

Another object is to provide a filter system for filtering a fluid to receive such a replaceable filter element.

The above objects are achieved according to one aspect of the invention of a filter element, in particular flat filter element, for filtering a fluid, in particular for air filtration, in particular for Motoransaugluftfilterung, or Gebäudeluftfilterung or Innenraumluftfilterung, with at least one filter bellows, the intended raw side and one of these opposite intended clean side wherein the filter bellows is surrounded circumferentially by a frame sealing the end edges of the filter bellows, with a seal-carrying web projecting laterally from the frame, wherein the web has a first subarea which is arranged at an angle to a side wall of the frame , wherein the angle is selected from a range of 0 ° to 180 ° relative to the side wall of the frame on which the web is arranged, wherein the edge of the side wall of the frame at the intended clean side of the 0 ° angle defini ert and the edge of the side wall of the frame at the intended raw side defines the 180 ° angle, and a second portion which is formed in the direction of force introduction, wherein in the second portion of the web, a Verpressbereich is provided, which adjoins the first portion of the web, wherein the second partial region can be arranged in particular at an angle to the first partial region, wherein the angle can be selected as a function of the angle of the first partial region so that the second partial region is formed in the force introduction direction in the sealing state, and if openings are provided, wherein the openings extending in the region of the outer edge, in particular along the outer edge, of the second portion of the web, wherein a radial seal surrounding the web is provided and sealing material of the radial seal extends through the openings, and at least one sealing surface of the radial seal with respect to a F Lachseite the Verpressbereichs of the second portion of the web axially in the opposite direction to the force introduction direction spaced to the Verpressbereich of the web is arranged.

The angle which the first portion of the web encloses with the side wall of the frame may in particular be perpendicular to the side wall, and the first portion of the web thus selected to be directed at right angles outwards, or for example at 0 ° angle from the edge of the side wall of the frame be directed upward in the flow direction, or be directed for example at an angle of 180 ° from the edge of the side wall of the frame against the flow direction downwards. However, the angle of the first portion of the web can be freely selected in the range of 0 ° to 180 ° and in particular adapted to the respective space specifications.

Due to the arrangement of the radial seal in the compression region of the second portion of the web, the force is sealed when using the filter element in a filter housing, even at the interface between passing through the opening sealant and the web surface structurally simple, safe and uniform in the sealing force, so that a Passage of raw air to the clean side at this interface is reliably prevented by the radial seal. The radial seal according to the invention thus enables a constructively simple seal which can be fastened by means of mechanical anchoring to a plastic frame, wherein no additional surface treatment of the plastic frame is required, wherein at the interface of the mechanical anchoring a secure tightness when used in a filter housing are structurally simple can, and there is provided a radial seal in which the sealing force of the sealing material is uniformly distributed in cooperation with the web of the frame of the filter element and in addition the anchoring of the radial seal of the filter element of the sealing force is structurally easily decoupled.

The radial seal of the invention has a direction of sealing force of the seal, which - when using the filter element according to the invention in a filter housing - acts orthogonal, based on the mounting direction of an upper housing part on a lower housing part. Described is the filter element according to the invention is inserted into a housing lower part and held by this, and the upper housing part is placed on the lower housing part. The radial seal of the filter element in the installed state can cooperate sealingly with the upper housing part alone or alternatively with the upper housing part and the lower housing part, the sealing force effect being orthogonal to the force introduction direction in the sealing state, ie in the installation situation of the filter element according to the invention in the filter housing. The upper housing part according to the invention is the housing part, which is connected to the intended clean side of the filter element. With In other words, the direction of the sealing force of the radial seal relative to the filter element according to the invention acts orthogonal to the flow direction or the vertical axis of the filter element.

According to another aspect of the invention, the object is achieved by a filter system for filtering a fluid with at least one such filter element.

Favorable embodiments and advantages of the invention will become apparent from the other claims, the description and the drawings.

It is proposed a filter element for filtering a fluid with at least one filter bellows, which has a designated raw side and one of these opposite intended pure side. According to the invention, the at least one sealing surface is provided so that an introduction of force via the at least one sealing surface on a sealing line of the frame, in particular the laterally projecting from the frame outwardly projecting seal web, takes place, wherein the web has a first portion, which at an angle is arranged to a side wall of the frame, wherein the angle is selected from a range of 0 ° to 180 ° relative to the side wall of the frame to which the web is arranged, wherein the edge of the side wall of the frame at the intended clean side of the 0 ° angle defined and defines the edge of the side wall of the frame at the intended raw side of the 180 ° angle, and a second portion which in the force introduction direction, the force introduction direction in the sealing state, is formed, wherein in the second portion of the web, a Verpressbereich is provided, which the first n subregion of the web connects, wherein the second portion may be arranged in particular at an angle to the first portion, wherein the angle can be selected depending on the angle of the first portion so that the second portion is formed in the direction of force seal in the sealing state, and openings are provided, wherein the openings in the region of the outer edge, in particular run along the outer edge of the second portion of the web, wherein a web on the circumferential radial seal is provided and sealing material of the radial seal extends through the openings, and at least one sealing surface of the Radially sealed relative to a flat side of the Verpressbereichs of the second portion of the web axially in the opposite direction to the force introduction direction spaced from the Verpressbereich of the web is arranged. The force receiving surface of the radial seal can be chosen so that it is not weakened by material breakthroughs in the frame and / or in the web or the openings. The anchoring of the radial seal on the frame is thus largely decoupled from the sealing function. Thus, a uniform force curve when introducing forces in the radial seal can be achieved, so that the risk of leakage of the filter element is significantly reduced or prevented. In this way, sealing function and anchoring of the radial seal on the frame of the filter bellows can be structurally easily separated advantageous. In other words, with regard to the fact that the radial seal of the filter element usually has a different material than web and frame and these materials may have different compression forces with the same compression, by the separation of the sealing function and anchoring at the same compression a different sealing effect can be avoided. In addition, the space requirement of the filter element can be reduced. In addition, the radial seal facilitates installation in a filter housing, since the sealing beads of the radial seal are flexible and the at least one sealing surface is formed parallel to the housing wall of the female housing part, thereby further facilitating correct positioning. In a sealing interaction of radial seal and housing upper part also manufacturing tolerances of filter element and upper housing part can be easily and constructively balanced.

The angle which the first section of the web encloses with the side wall of the frame may in particular be at right angles to the side wall, and the first section of the web thus chosen to be directed at right angles to the outside, or for example at 0 ° from the edge of the side wall of the frame be directed upward in the flow direction, or be directed for example at an angle of 180 ° from the edge of the side wall of the frame against the flow direction downwards. However, the angle of the first portion of the web can be freely selected in the range of 0 ° to 180 ° and in particular adapted to the respective space specifications.

According to the invention, the filter bellows is circumferentially surrounded by a frame with the laterally projecting, seal-carrying web, wherein openings are provided in the web which extend in the region of its outer edge, in particular along its outer edge, whereby a radial seal according to the invention is provided on the web. wherein sealing material of the radial seal extends through the openings.

Preferably, the web and the side wall of the frame form a one-piece component, and in particular the web can be produced in one piece with the side wall of the frame. The jetty can be arranged according to the invention directly on the side wall, or on a rib of the frame, for example, a stiffening rib, be arranged, which is directed away from the side wall to the outside, so directed away from the filter bellows.

According to the invention, the pressing region of the second subregion of the web is the region which is arranged between the first subregion of the web and the opening in the second subregion of the web. When sealing, the sealing force of the radial seal acts orthogonal to the direction of force transmission on the Verpressbereich of the web.

Preferably, the filter bellows can be configured as a flat filter. In addition, the filter bellows may be formed of a filter medium which is folded in a zigzag fashion along fold edges to folds each extending between opposite end edges of the filter bellows. The folding edges of the filter bellows are on the raw side in an inflow surface and on the clean side in an outflow surface of the filter bellows. The openings may preferably be provided circumferentially in the frame, in particular in the web. The inflow and the outflow can be flat surfaces or free-form surfaces that can be designed as needed.

The radial seal of the filter element usually has a different material than web and frame, since the radial seal has to fulfill another function. Therefore, the radial seal is formed for example of polyurethane (PUR), which proves to be flexible enough to achieve a permanent sealing function, while the frame can be made for example of polyamide (PA), polypropylene (PP) or polyester. The encircling frame of the filter bellows can for example be injection-molded from plastic in an injection molding directly to the filter bellows, in particular, the filter bellows can be molded directly with a frame side wall as a front edge seal. As plastics such as PA or PP can be used, with PP is less expensive. A radial seal for sealing between the raw side and the clean side of the filter bellows can then be molded or foamed onto an outer edge of the frame. In known solutions, seals made of PUR, for example, molded to PA frame, the PUR radial seal with the PA frame enters into a compound. However, a molded PUR radial seal does not adhere to the cost-effective PP frame in the desired manner, but can become detached from the frame during operation, which can lead to leakage of the filter element. According to the invention therefore openings are provided circumferentially in the web around the frame, so that the molded sealing material can penetrate into the openings and penetrate them, thus a mechanical anchoring is effected. The cured radial seal thus has an advantageous toothing with the web and thus the frame, whereby a durable durability of the radial seal and thus the tightness of the filter element is ensured. Appropriately, can be provided as openings long holes whose longer dimension extends along the web. Due to the undercut of the molded radial seal thus results in an advantageous anchoring of the radial seal between the web of the frame and the radial seal. In particular, a plurality of closely spaced oblong holes can be provided in the web in order to achieve the best possible anchoring of the radial seal with the web and thus the frame.

Sealing surfaces of the sprayed onto the web of the frame radial seal can then be suitably carried out on sealing beads or sealing lips or on a flat portion of the radial seal, the seal geometry may be conveniently arbitrary. The radial seal may have at least one sealing surface, advantageously in particular two sealing surfaces, wherein two sealing surfaces advantageously, in particular mirror-symmetrical, on the one hand seal the raw side and on the other the clean side and each to one side of the web. Alternatively, however, only one sealing surface may be present, which in particular seals the raw side. The provision of a sealing bead with sealing surface is particularly favorable for power absorption and introduction into the frame.

According to an advantageous embodiment, the circumferential on the web radial seal may have at least one one-sided or preferably two-sided formed on the radial seal sealing bead and in particular at least one of the sealing surfaces of the radial seal on the sealing bead. A two-sided configuration of the radial seal is particularly advantageous in a sealing interaction of radial seal and housing upper part and lower housing part, as can be particularly structurally particularly simple and safe prevented by the two-sided design that are not sucked for filtration certain ambient air past the radial seal on the raw side can. In a sealing interaction of the radial seal and the upper housing part manufacturing tolerances of the filter element and the upper housing part can be easily and constructively balanced. The sealing bead is inventively formed in the radial direction. The radial direction is according to the invention based on the direction of the sealing force of the seal, which, when using the filter element according to the invention in a filter housing, orthogonal acts relative to the mounting direction when mounting a housing upper part on a lower housing part or on the flow direction of the filter element. Described is the filter element according to the invention is inserted into a housing lower part and held by this and the upper housing part is placed on the lower housing part. The radial seal of the filter element in the installed state can cooperate sealingly with the upper housing part alone or alternatively with the upper housing part and lower housing part. The upper housing part according to the invention is the housing part, which is connected to the intended clean side of the filter element.

In a further embodiment, in a two-sided embodiment of the radial seal, wherein the sealing surfaces face each other, also in the introduction of force the force are passed directly through the radial seal from a sealing surface on the opposite sealing surface and / or on the frame of the filter element. Also, so the burden of the sealing material is lower, since the risk that the sealing material is pressed when force is introduced through the openings and thus in the long run a possible leakage could be further reduced. Overall, the burden on the radial seal by exerting a non-uniform force in the sealing material in this way structurally simple, additionally reduced.

In a further embodiment, the web can have a height profile around the filter element, the web being arranged, for example, at different heights from the lower edge of the frame, in particular on a side wall in the region of the lower edge and on an opposite side wall of the frame in the region the upper edge is arranged. However, the web can also be arranged circumferentially around the filter element at the same height.

Furthermore, a sealing lip or scraper can be additionally provided as a sealing surface.

According to an advantageous embodiment, the sealing surface may additionally be arranged orthogonal to the fold edges and / or inflow surface and / or outflow surface of the filter bellows. This allows a simple construction of counter surfaces for the sealing surface.

According to an advantageous embodiment, the first portion of the web can be arranged parallel to folding edges and / or inflow and / or outflow. This allows a simple construction and the best possible stiffening of the frame.

According to an advantageous embodiment, the web can be formed at a free end of the frame but can also be arranged in another, predetermined position on the frame. The web can, for example, above, thus viewed from the edge of the frame in the flow direction up, in the region of the center, in the region of the upper edge, in the region of the lower edge or below the frame, thus viewed from the edge of the frame in the flow direction down be arranged. The side wall of the frame can accommodate the filter bellows completely.

According to an advantageous embodiment, the openings may be formed in the web as elongated holes, which are arranged with their longer extension parallel to the outer edge of the web. With such an arrangement, the anchoring of the radial seal with the web and thus the frame can be increased in a suitable manner, with the same space requirement.

According to an advantageous embodiment, the outer edge of the web can be embedded in the sealing material of the radial seal. As a result, the frame can be conveniently sealed circumferentially over the web. In addition, the anchoring of the radial seal with the frame is suitably improved, so that forces can be introduced into the frame via the radial seal favorably.

According to an advantageous embodiment, the at least one sealing bead may have a trapezoidal cross-section. This allows a precise positioning of the location of the introduction of force in the sealing surfaces and a stable shape of the sealing bead.

According to an advantageous embodiment, two sealing beads on the second portion of the web can be arranged opposite one another. In this way can be structurally provided on both sides of the web sealing surfaces for two housing parts, between which the filter element is to be used as intended.

According to an advantageous alternative embodiment, the radial seal on one side may have the sealing bead with a sealing surface. This allows a structurally particularly simple production of the radial seal in a simple tool, without undercut and / or without slide, for example, a production by means of a structurally simple Freischäumwerkzeugs or injection molding tool, in which the tool must specify only a sealing bead on one side of the radial seal. In the case of manufacturing the gasket as a free-blown gasket, the gasket material, such as polyurethane, may be filled in a casting chamber having a compensation space for spreading the gasket material, and wherein the Compensating optionally additionally, for example, for the escape of air from the system during the curing process may be formed.

According to an advantageous embodiment, the frame may be formed of plastic and molded onto the filter bellows. The encircling frame of the filter bellows can be injection-molded, for example, advantageously made of plastic in an injection molding directly to the filter bellows, in particular the filter bellows can be molded directly with a frame side wall as a front edge seal. Thus, the sealing of the filter bellows is achieved in a suitable manner.

According to an advantageous embodiment, the frame may be formed of polypropylene (PP). PP is a low-cost plastic with suitable properties for use as a filter element, in particular in an air filter system of a motor vehicle. In addition, PP can be processed favorably in an injection molding process.

According to an advantageous embodiment, the radial seal can be made in a 2K process with the frame. If PP is used as the material for the frame and PUR for the radial seal, the radial seal can be conveniently prepared and molded in the manufacture of the frame in a two-component injection molding process. As a result, a suitable sealing effect for the filter element can be achieved in a reliable and cost-effective manner.

According to an advantageous embodiment, the radial seal according to the invention can be molded onto the frame by means of plastic injection molding and in particular be formed from high-pressure polyurethane. In this way, a very cost-effective solution for achieving a favorable and permanent sealing effect can be achieved together with a reliable anchoring of the radial seal with the frame, which is also suitable for cost-effective mass production. Also, the mechanical stability of the radial seal for long-term use conditions, especially in the automotive sector, is ensured so advantageous.

Alternatively, according to an advantageous embodiment, the radial seal formed as a plastic foam seal and in particular be formed of free-foaming polyurethane. Thus, for example, the radial seal can be foamed with a suitable tool to the frame, wherein the tool predetermines and determines the contours of the sealing surfaces, while more free area can be provided in the tool over which the sealing material can foam out freely.

According to a further aspect, the invention relates to a filter system for filtering a fluid, comprising a filter housing and a filter element interchangeable in the filter housing between a raw side and a clean side, with at least one filter bellows. The filter bellows has a designated raw side and a designated clean side opposite this, the filter bellows being circumferentially surrounded by a frame sealing the end edges of the filter bellows with a seal-carrying web projecting laterally from the frame, the web having a first subarea, which is arranged at an angle to a side wall of the frame, wherein the angle is selected from a range of 0 ° to 180 ° relative to the side wall of the frame on which the web is arranged, wherein the edge of the side wall of the frame at the intended clean side Defines the 0 ° angle and defines the edge of the side wall of the frame at the intended raw side of the 180 ° angle, and a second portion which is formed in the direction of force introduction, wherein in the second portion of the web, a Verpressbereich, which at the first portion of the web subsequently The second portion can be arranged in particular at an angle to the first portion, and openings are provided, wherein the openings extend along the outer edge of the second portion of the web, wherein a web-extending radial seal is provided and sealing material of the radial seal through the Openings extends, and at least one sealing surface of the radial seal with respect to a flat side of the Verpressbereichs of the second portion of the web axially in the opposite direction to the force introduction direction spaced from the Verpressbereich of the web is arranged.

The angle which the first section of the web encloses with the side wall of the frame may in particular be at right angles to the side wall, and the first section of the web thus chosen to be directed at right angles to the outside, or for example at 0 ° from the edge of the side wall of the frame be directed upward in the flow direction, or be directed for example at an angle of 180 ° from the edge of the side wall of the frame against the flow direction downwards. However, the angle of the first portion of the web can be freely selected in the range of 0 ° to 180 ° and in particular adapted to the respective space specifications.

The at least one sealing surface may be formed on a sealing bead or on a sealing lip or in a flat region of the seal. The housing parts may have correspondingly formed housing-side sealing surfaces.

According to the invention, the force is introduced via the at least one sealing surface in the opening-free region of the web of the frame, in particular between the openings and the filter bellows. Thus, in the introduction of force, the force can be passed directly through the radial seal from a sealing surface to an opposite sealing surface and / or on the web of the filter element. Also, so the burden of the sealing material is lower, since the risk that the sealing material is pressed through the openings and thus could lead to possible leakage in the long term, constructively simple and safe reduced. Overall, the load on the radial seal is reduced by exerting a non-uniform force in the sealing material in this way.

The described filter system can advantageously be used as an air filter, in particular as an air filter of an internal combustion engine or as an interior air filter, in particular a motor vehicle, in particular for Motoransaugluftfilterung, or for Gebäudeluftfilterung or cabin air filtration.

list of figures

• 1 eine isometrische Darstellung eines Filterelements nach einem Ausführungsbeispiel der Erfindung mit angespritzter umlaufender Dichtung an einem Steg, wobei der erste Teil des Stegs rechtwinklig zu einem Rahmen des Filterelements angeordnet ist;
• 2 eine isometrische Darstellung des Filterelements nach 1 ohne umlaufende Dichtung;
• 3 einen Längsschnitt durch das Filterelement nach 1 ;
• 4 einen Ausschnitt mit Fokus auf den Dichtungsbereich des Filterelements nach 1 ;
• 5 einen Ausschnitt mit Fokus auf den Dichtungsbereich des in ein Filtergehäuse eingebauten Filterelements nach 1 ;
• 6 einen Ausschnitt mit Fokus auf den Dichtungsbereich des in ein weiteres Filtergehäuse eingebauten Filterelements nach 1 ;
• 7 eine isometrische Darstellung eines Filterelements nach einem weiteren Ausführungsbeispiel der Erfindung, mit beispielsweise angespritzter, umlaufender Dichtung wobei der erste Teil des Stegs in einem weiteren Winkel zum Rahmen des Filterelements angeordnet ist;
• 8 einen Ausschnitt mit Fokus auf den Dichtungsbereich des in ein Filtergehäuse eingebauten Filterelements nach 7;
• 9 einen Ausschnitt mit Fokus auf den Dichtungsbereich des in ein weiteres Filtergehäuse eingebauten Filterelements nach 7;
• 10 einen Längsschnitt durch das Filterelement nach 7 im in ein Filtergehäuse eingebauten Zustand;
• 11 einen Längsschnitt durch ein Filtersystem nach einem Ausführungsbeispiel der Erfindung;
• 12 den Dichtungsbereich des Filterelements mit Werkzeug für den Freischäumprozess mit einer Dichtfläche nach einem weiteren Ausführungsbeispiel;
• 13 einen Ausschnitt mit Fokus auf den Dichtungsbereich des Filterelements nach 12
• 14 einen Ausschnitt mit Fokus auf den Dichtungsbereich des in ein weiteres Filtergehäuse eingebauten Filterelements nach 12;
• 15 einen Ausschnitt mit Fokus auf den Dichtungsbereich eines, beispielsweise angespritzten, Filterelements nach einem weiteren Ausführungsbeispiel mit einer Dichtfläche;
• 16 einen Ausschnitt mit Fokus auf den Dichtungsbereich des in ein weiteres Filtergehäuse eingebauten Filterelements nach 15;
• 17 einen Ausschnitt mit Fokus auf den Dichtungsbereich eines Filterelements mit Axialdichtung gemäß dem Stand der Technik wie in CN102380272 A gezeigt.

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawings, description and claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations. They show by way of example:

• 1 an isometric view of a filter element according to an embodiment of the invention with molded circumferential seal on a web, wherein the first part of the web is arranged at right angles to a frame of the filter element;
• 2 an isometric view of the filter element after 1 without circumferential seal;
• 3 a longitudinal section through the filter element after 1 ;
• 4 a section with focus on the sealing area of the filter element after 1 ;
• 5 a section with focus on the sealing region of the built-in filter housing filter element after 1 ;
• 6 a section with focus on the sealing region of the built-in another filter housing filter element after 1 ;
• 7 an isometric view of a filter element according to a further embodiment of the invention, with, for example, molded, circumferential seal wherein the first part of the web is arranged at a further angle to the frame of the filter element;
• 8th a section with focus on the sealing region of the built-in filter housing filter element after 7 ;
• 9 a section with focus on the sealing region of the built-in another filter housing filter element after 7 ;
• 10 a longitudinal section through the filter element after 7 in installed in a filter housing state;
• 11 a longitudinal section through a filter system according to an embodiment of the invention;
• 12 the sealing region of the filter element with tool for the free-foaming process with a sealing surface according to a further embodiment;
• 13 a section with focus on the sealing area of the filter element after 12
• 14 a section with focus on the sealing region of the built-in another filter housing filter element after 12 ;
• 15 a detail with focus on the sealing region of, for example, molded, filter element according to a further embodiment with a sealing surface;
• 16 a section with focus on the sealing region of the built-in another filter housing filter element after 15 ;
• 17 a detail with focus on the sealing region of a filter element with axial seal according to the prior art as in CN102380272 A shown.

Embodiments of the invention

In the figures, the same or similar components are numbered with the same reference numerals. The figures are merely examples and are not intended to be limiting.

1 shows an isometric view of a filter element 10 according to an embodiment of the invention with molded circumferential radial seal 40 while in 2 the filter element 10 without molded circumferential radial seal 40 is shown. The radial seal 40 However, according to the invention, for example, it can also be foamed free from, for example, a radial seal 40 be made for example of free-foaming polyurethane. 3 shows a longitudinal section through the filter element 10 and 4 Cutout with focus on the Sealing area of the filter element 10 , In 5 and in 6 is the detail of in embodiments of filter housings 108 built-in filter element 10 represented, wherein the respective filter housing 108 with housing upper part 112 and housing base 114 is shown schematically.

The filter element 10 has a filter bellows 12 on, the intended raw side 50 and one of these opposite intended clean side 52 and from a filter medium 14 is formed along folding edges 26 zigzag to wrinkles 34 is folded, each between opposite end edges 22 . 23 the filter bellows 12 extend. The folding edges 26 each lie on the raw side in an inflow area 13 and clean side in a downstream surface 15 in particular, each may be just trained. The inflow and outflow surface 13 . 15 is perpendicular to the vertical axis in this embodiment 16 the filter bellows 12 educated. The vertical axis 16 shows in 1 and 2 also schematically the flow direction 54 of the filter element 10 from the raw side 50 on the clean side 52 at. The filter bellows 12 has a frame around it 28 on with a sidewall 29 and a circumferentially arranged laterally projecting web 31 with an outer edge 32 (in 2 shown). The jetty 31 is preferably at the free end of the side wall 29 arranged, for example, at the intended pure-side free end. In 5 and 6 is the jetty 31 For example, on a stiffening rib 55 the side wall 29 shown arranged. In the footbridge 31 are circumferential openings 30 provided through which openings 30 sealing material of the radial seal 40 extends. The radial seal 40 is therefore safe on the frame 28 anchored. The radial seal 40 has two at the jetty 31 opposite sealing beads 41 . 43 each with a sealing surface 42 . 44 so on that a force transmission over the sealing surfaces 42 . 44 the sealing beads 41 . 43 on a sealing line of the injection area 45 of the second subarea 31 - 2 of the footbridge 31 laterally offset to the openings 30 takes place when the sealing surfaces 42 . 44 in projection on the jetty 31 to be viewed as especially in 5 and 6 can be seen. In 5 and 6 is an example of the direction of the sealing force effect 57 the radial seal 40 shown in installation or sealing situation. The radial seal 40 is in the second part 31-2 of the footbridge 31 anchored secured and the sealing force of the radial seal is along the bridge 31 distributed homogeneously, decoupled from the anchorage, and a passage of raw air to the clean air side 52 becomes force 48 of the housing 108 constructively simple and safe prevented. The radial seal 40 has the additional advantage over an axial seal geometry that the installation in a housing 108 due to the flexibility of the radial seal 40 additionally facilitated, in particular the correct positioning is additionally facilitated. Whereas in an axial seal, such as in 17 represented, the outer edge 32 of the jetty 31 allows a slightly lower flexibility relative to the housing walls, especially for the same volume of the seal. The radial seal according to the invention 40 is therefore very easy to position. In addition, through the radial seal 40 structurally simple manufacturing tolerances of filter element and filter housing can be compensated.

The frame 28 with side wall 29 and footbridge 31 is made of plastic and attached to the filter bellows 12 molded, the frame 28 can be advantageously formed from the inexpensive polypropylene. This can be the frame 28 the function of the front edge seal, which usually takes place with a sideband, advantageously take over. The frame 28 can additionally by in the longitudinal direction of the filter bellows 12 extending stabilization webs 24 be stiffened, so that larger filter elements 10 torsion resistant can be produced. The frame 28 can be seen on the outside, as in the embodiment in 1 represented, additionally by a ribbing 25 on the side wall 29 be stiffened.

The radial seal 40 can be plastic injection molded to the bridge 31 of the frame 28 molded and in particular be formed from high-pressure polyurethane. Optionally, the radial seal 40 even in a 2K process with the frame 28 be prepared.

As in 2 It can be seen, the openings 30 in the dock 31 be designed in particular as slots, which with their longer extension parallel to the outer edge 32 of the footbridge 31 are arranged. This results in the molding of the PUR radial seal 40 a particularly favorable anchoring with the dock 31 of the frame 28 ,

The jetty 31 stands sideways from the frame 28 Seen from the outside and is seal-bearing, with the bridge 31 a first subarea 31 - 1 which is at an angle selected from a range of 0 ° to 180 ° with respect to the side wall (FIG. 29 ) of the frame ( 28 ) at which the bridge ( 31 ), wherein the edge of the side wall 29 of the frame 28 defined on the intended clean side of the 0 ° angle and the edge of the side wall 29 of the frame 28 defines the 180 ° angle at the intended raw side, for example, at right angles to the side wall 29 , to the outside or, for example, at 0 ° angle from the edge of the side wall 29 of the frame 28 in flow direction 54 upward or, for example, at 180 ° angle from the edge of the side wall 29 of the frame 28 directed against the flow direction down and a second portion 31 - 2 ( see also detail views in 4 to 6 ), which in the direction of force introduction 48 is formed in the sealing state, wherein in the second portion 31 - 2 of the footbridge 31 a grout area 45 , which is at the first subarea 31 - 1 of the footbridge 31 connects and openings 30 are provided, wherein the openings 30 along the outer edge 32 of the second subarea 31 - 2 of the footbridge 31 run, with the at the bridge 31 circumferential radial seal 40 is provided and sealing material of the radial seal 40 through the openings 30 extends, and at least one sealing surface 42 . 44 the radial seal 40 based on a flat side of the grout area 45 of the second subarea 31-2 of the footbridge 31 axially in the opposite direction to the force introduction direction 48 spaced from the grout area 45 of the footbridge 31 is arranged. The jetty 31 can along the side wall 29 be arranged in different positions perpendicular to the wall direction. The jetty 31 can also be on a sidewall 29 in one position and on a second side wall 29 be arranged in a second position, which is different to the first position. In 1 and 2 is the jetty 31 around the filter element 10 shown running around at the same height. The angle α, which the first subregion ( 31-1 ) of the bridge ( 31 ) with the side wall ( 29 ) of the frame ( 28 ), can be chosen freely in the range from 0 ° to 180 ° and in particular adapted to the respective installation space specifications, in the figures, by way of example, a right angle ( α ) and an angle α of about 60 ° shown.

In 3 is the zigzag folding of the filter bellows 12 with each to the raw side 50 and clean side 52 showing folding edges 26 the folds 34 to recognize. Next is the T-shaped cross section of the outer edge 32 of the footbridge 31 molded radial seal 40 see details of the radial seal 40 in 5 are shown. The flow direction 54 of the fluid to be filtered from the raw side 50 on the clean side 52 the filter bellows 12 is also shown.

4 shows a section with focus on the sealing area of the filter element 10 to 1 , The radial seal 40 attached to the from the sidewall 29 of the frame 28 laterally projecting bridge 31 of the frame 28 molded, passes through as slots along the outer edge 32 trained openings 30 of the footbridge 31 so that the radial seal 40 with the frame 28 firmly anchored. The outer edge 32 is so in the sealing material of the radial seal 40 embedded. The radial seal 40 has in the illustrated embodiment, two opposing sealing surfaces 42 . 44 on, the axially above or below the bridge 31 are arranged. The jetty 31 stands sideways from the frame 28 Seen from the outside and is seal-bearing, with the bridge 31 a first subarea 31-1 which is perpendicular to the side wall 29 , directed to the outside (see detail views in 4 to 6 ) and a second subarea 31-2 , which in the direction of force introduction 48 is formed, wherein in the second portion 31-2 of the footbridge 31 a grout area 45 , which is at the first subarea 31-1 of the footbridge 31 connects and openings 30 are provided, wherein the openings 30 along the outer edge 32 of the second subarea 31-2 of the footbridge 31 run, with the at the bridge 31 circumferential radial seal 40 is provided and sealing material of the radial seal 40 through the openings 30 extends, and at least one sealing surface 42 . 44 the radial seal 40 based on a flat side of the grout area 45 of the second subarea 31-2 of the footbridge 31 axially in the opposite direction to the force introduction direction 48 spaced from the grout area 45 of the footbridge 31 is arranged. The jetty 31 can along the side wall 29 be arranged in different positions perpendicular to the wall direction. The jetty 31 can also be on a sidewall 29 in one position and on a second side wall 29 be arranged in a second position, which is different to the first position.

5 shows a section with focus on the sealing area of a filter housing 108 built-in filter element 10 , The filter element 10 lies with the sealing surface 44 the radial seal 40 on the lower housing part 114 of the filter housing 108 while the upper housing part 112 of the filter housing 108 at the sealing surface 42 is applied. Will the filter housing 108 closed, so can the force application 48 over the sealing surfaces 42 . 44 the sealing beads 41 . 43 between the openings 30 and the filter bellows 12 in the opening-free injection area 45 of the second subarea 31 - 2 of the footbridge 31 of the frame 28 respectively. In this way, the forces exerted to seal the filter element 10 in the filter housing 108 for separation of raw side 50 and clean side 52 are needed, right in the jetty 31 of the frame 28 be initiated. The sealing material is so evenly loaded, and in particular the sealing material is subject to the openings 30 no pressure. So can the function of the radial seal 40 be ensured permanently advantageous. It may be due to the direction of the sealing force effect 57 the radial seal 40 also an air passage of raw air along the web edge of the web 31 structurally easy to prevent.

In 6 is in a cutout with focus on the sealing area of the filter housing 108 built-in filter element 10 another embodiment of a filter housing 108 shown, wherein the upper housing part 112 on both sealing surfaces 42 . 44 is applied.

In 7 is an isometric view of a filter element 10 according to a further embodiment of the invention with molded circumferential radial seal 40 to see. The main difference to that in 1 to 6 illustrated embodiment represents the shape of the web 31 , where the first subarea 31-1 of the footbridge 31 at an angle α , for example, of 60 ° to the side wall 29 and is arranged projecting therefrom and the second portion 31-2 of the web in force introduction direction 48 or perpendicular to the flow direction 54 is arranged and attached to the first subarea 31-1 followed. The second part 31-2 is at an angle β to the first subregion 31-1 arranged, wherein the angle as a function of the angle α of the first portion 31-1 can be chosen so that the second subarea 31-2 is formed in the sealing state in the direction of force introduction. The angles α and β are exemplary in 7 are drawn in for clarity and only in the 7 shown. The explanations on the angle also apply to 1 to 6 and for the following ones 8th to 16 , The other embodiment of the filter element 10 corresponds to the embodiment of the first embodiment and is therefore not further explained.

8th to 10 each show a section with focus on the sealing area of a filter housing 108 built-in filter element 10 according to the further embodiment. The radial seal 40 is designed for example as a plastic foam seal and, for example, in particular from free-foaming polyurethane at the bridge 31 educated. In 8th lies the lower housing part 114 of the filter housing 108 at the sealing surface 42 while the upper housing part 112 of the filter housing 108 at the sealing surface 44 is applied. In 9 lies the housing upper part 112 of the filter housing 108 both on the sealing surface 42 as well as on the sealing surface 44 at. 10 clearly shows that by the choice of a predetermined angle α for the arrangement of the first portion 31 - 1 of the footbridge 31 the filter element 10 in a filter housing 108 can be installed, due to space requirements, for example, a housing base 114 with different height of the side walls of the housing base 114 and this height difference for a good flow-on position of the filter element 10 by means of the positioning of the webs 31 on the respective side wall 29 the filter element can be easily balanced design.

The jetty 31 can around the filter element 10 circumferentially have a height profile, wherein the web 31 For example, as seen from the lower edge of the frame is arranged in regions at different heights, in particular, the web can 31 on a side wall 29 of the frame 28 in the area of the lower edge of the frame 28 and on an opposite side wall 29 of the frame 28 in the area of the upper edge of the frame 28 be arranged. The jetty 31 may also be above the top of the frame, for example 28 in the direction of flow 54 directed upwards, in the middle of the frame 28 , in the area of the upper edge of the frame 28 , in the area of the lower edge of the frame 28 or in the direction of flow 54 viewed from the bottom edge of the frame 28 be directed downwards.

11 shows a longitudinal section through a filter system 100 according to an embodiment of the invention. The filter system 100 for filtering a fluid, has a filter housing 108 and one in the filter housing 108 between a raw page 50 and a clean side 52 replaceable arranged filter element 10 on. The filter element 10 corresponds to the example in 1 to 6 described embodiment with two sealing beads 41 . 43 , The filter housing 108 has a lower housing part 114 and an upper housing part 112 on, between which the filter element 10 is arranged. An inlet 102 is in the housing lower part 114 arranged so that the fluid to be filtered in the flow direction 140 through the inlet 102 in the lower housing part 114 can flow in and then through the filter element 10 from the raw side 50 on the clean side 52 of the filter element 10 flows in the direction of flow 54 and then through the housing upper part 112 arranged outlet 104 in the flow direction 142 can escape again.

The filter element 10 comprises, as in the previously described embodiments, a filter bellows 12 which folds zigzag to fold 34 folded, with parallel, in a longitudinal extension 14 the bellows 12 successive fold edges 26 , each between opposite end edges 22 . 23 the filter bellows 12 extend. The filter bellows 12 has a frame around it 28 with an outer edge 32 on, being in the dock 31 of the frame 28 circumferential openings 30 are provided through which openings 30 Seal material of a radial seal 40 extends. The radial seal 40 has two opposing sealing beads 41 . 43 with sealing surfaces 42 . 44 so on that a force transmission over the two sealing surfaces 42 . 44 on a sealing line of the bridge 31 of the frame 28 laterally offset to the openings 30 he follows. The introduction of force via the two sealing beads 41 . 43 with the sealing surfaces 42 . 44 takes place in particular between the openings 30 and the filter bellows 12 in the opening area of the footbridge 31 , The first sealing surface 42 is for sealing the clean side 52 of the filter element 10 against the upper housing part 112 and the second sealing surface 44 is for sealing the raw side 50 of the filter element 10 against the lower housing part 114 intended. The two sealing surfaces 42 . 44 are axially above or below the bridge 31 of the frame 28 arranged.

12 shows the sealing area of the filter element 10 according to another embodiment with tool 130 for the free foam process with a casting chamber 138 , which serves to receive the sealing material in the uncured state. The radial seal 40 has, as can be seen in cross-section, a sealing surface 42 which in the PU foam-free process by the shaping of the tool 130 are set, and it is correspondingly a sealing bead 41 provided on the sealing surface 42 is arranged. At the opposite side to the sealing surface 42 the sealant is flat and has no further radial sealing surface. This allows a structurally particularly simple tool 130 ,

The tool 130 may conveniently be two parts 132 . 134 include, which can be removed after curing of the PUR material. The introduced PUR material can in the free foam process by the two tool parts 132 . 134 defined cavity of the casting chamber 138 fill in and so the radial seal 40 with the sealing surfaces 42 . 44 or as exemplified in the 12 shown only one sealing surface 42 form, wherein the PUR material during foaming in by the tool 130 as exemplified here as a gap formed compensation space 136 can expand. The gap 136 is thus one in the casting chamber 138 a compensation space for spreading the sealing material and may also be optionally provided for the derivation of air displaced by the sealing compound during the curing process.

The shape of the radial seal 40 can do so by shaping the tool parts 132 and or 134 be given favorable. Such a free-foaming process can advantageously be a very cost-effective production of the radial seal 40 enable.

The casting chamber 138 is filled with the sealing material and the sealing material can then harden, whereby the radial seal according to the invention 40 as free-blown radial seal 40 receives, wherein the radial seal 40 in the hardened, hardened state at least one sealing surface 42 . 44 each having a portion of the chamber walls of the casting chamber 138 equivalent.

Additionally or alternatively to the compensation room 136 inside the casting chamber 138 also comes into consideration, in which the compensation space 136 outside the casting chamber 138 arranged and with the casting chamber 138 is connected so that in this embodiment during the curing process sealing material can pass into the compensation space. Additional vents, which are provided in the prior art, can be omitted, so that the sealing surfaces 42 . 44 are made smooth-walled and without protruding sealing lugs after curing of the sealing material and thus in the case of execution of the radial seal 40 as free-blown radial seal 40 additionally advantageously no or only a reduced reworking effort is required.

The free-blown radial seal 40 of the 12 is also in 13 without tools 130 and in 14 in installation situation in a housing 108 with an upper housing part 112 and a lower housing part 114 shown.

In 15 and 16 is another embodiment of the radial seal according to the invention 40 with a sealing surface 42 and a sealing bead 41 represented, which can be injected, for example. In 16 is the embodiment according to 15 in installation situation in a housing 108 with an upper housing part 112 and a lower housing part 114 shown.

17 shows an axial seal according to the prior art, as in CN 102 380 272 A is shown. In a housing 116 with an upper housing part 118 and a lower housing part 120 is a filter element 60 with a frame 62 and a side wall 64 shown, with a bridge 66 from the side wall 64 is arranged at right angles to this and directed outwards and wherein the web 66 an opening 68 has, through which sealing material of the axial seal 70 can pass through. The axial seal 70 has a sealing bead 72 , which above the bridge 66 is arranged and its sealing surface 74 with the upper housing part 118 and the lower housing part 120 in installation situation and in direction of force application 48 , wherein the sealing effect direction 76 the force introduction direction 48 equivalent. However, the sealing force is in the area of the web 66 different to the sealing force in the area of the opening 68 because in the area of the opening 68 only sealing material is arranged while in the area of the web 66 Seal material and web material are pressed axially.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102009056511 A1 [0003]
• CN 102380272 A [0006, 0046]
• DE 10058478 A1 [0007]

Claims (22)

Filter element, in particular flat filter element, (10) for filtering a fluid, having at least one filter bellows (12) having a designated raw side (50) and a designated clean side (52) opposite this intended, the filter bellows (12) circumferentially of a the End edges (22, 23) of the filter bellows (12) sealing frame (28) is surrounded, with a side facing away from the frame (28) outwardly projecting, seal-carrying web (31), wherein the web (31) has a first portion (31 -1) disposed at an angle to a side wall (29) of the frame (28), the angle (a) being selected from a range of 0 ° to 180 ° with respect to the side wall (29) of the frame (28), on which the web (31) is arranged, wherein the edge of the side wall (29) of the frame (28) defined on the intended clean side of the 0 ° angle and the edge of the side wall (29) of the frame (28) the intended raw side (52) the 180 ° Defined angle, and a second portion (31-2) which is formed in the force introduction direction (48), wherein in the second portion (31-2) of the web (31) has a Verpressbereich (45), which at the first portion (31 -1) of the web (31), and openings (30) are provided, wherein the openings (30) in the region of an outer edge (32), in particular along the outer edge (32) of the second portion (31-2) of the web (31) extend, wherein on the web (31) encircling radial seal (40) is provided and sealing material of the radial seal (40) through the openings (30), and at least one sealing surface (42, 44) of the radial seal (40) related on a flat side of the Verpressbereichs (45) of the second portion (31-2) of the web (31) axially in the opposite direction to the force introduction direction (48) spaced from the Verpressbereich (45) of the web (31) is arranged. Filter element (10) after Claim 1 wherein the radial seal (40) running around on the web (31) has at least one sealing bead (41) formed on one or two sides on the radial seal (40) and in particular at least one of the sealing faces (42, 44) of the radial seal (40) on the sealing bead ( 41) is arranged. Filter element (10) after Claim 1 or 2 , wherein the second portion (31-2) of the web (31) in particular at an angle (β) to the first portion (31-1) is arranged. Filter element (10) according to one of the preceding claims, wherein the at least one sealing surface (42, 44) is arranged parallel to fold edges (26) and / or inflow surface (13) and / or outflow surface (15) of the filter bellows (12). Filter element (10) according to one of the preceding claims, wherein the radial seal (40) in the region of the sealing bead (41) from the flat side of the Verpressbereichs (45) of the web (31) viewed a greater axial extent than in the region of the outer edge (32 ) and the openings (30). Filter element (10) according to any one of the preceding claims, wherein the web (31) around the filter element 10 circumferentially having a height profile, wherein the web (31) from the lower edge of the frame (28) is seen from regions arranged at different heights, in particular at a side wall (29) in the region of the lower edge and on an opposite side wall (29) of the frame (28) is arranged in the region of the upper edge. Filter element (10) according to one of the preceding claims, wherein the web (31) is arranged parallel to folded edges (26) and / or to flow surface (13) and / or outflow surface (15). Filter element (10) according to one of the preceding claims, wherein the web (31) at a free end of the frame (28) is formed. Filter element (10) according to one of the preceding claims, wherein the openings (30) are formed as elongated holes, which are arranged with their longer extension parallel to the outer edge (32) of the web (31). Filter element (10) according to one of the preceding claims, wherein the outer edge (32) of the web (31) is embedded in the sealing material of the radial seal (40). Filter element (10) according to one of the preceding claims, wherein two sealing beads (41, 43) in the pressing region (45) of the web (31) are arranged opposite one another. Filter element (10) according to one of Claims 1 to 11 wherein the radial seal (40) on one side of the sealing bead (41) with one of the sealing surfaces (42) and the web (31) opposite the other of the sealing surfaces (44) in a planar region of the radial seal (40). Filter element (10) according to one of the preceding claims, wherein the frame (28) is formed of plastic and molded onto the filter bellows (12). A filter element (10) according to any one of the preceding claims, wherein the frame (28) is formed of polypropylene. Filter element (10) according to one of the preceding claims, wherein the radial seal (40) in a 2K process with the frame (28) is made. Filter element (10) according to one of the preceding claims, wherein the radial seal (40) is injection-molded by means of plastic injection molding on the frame (28) and in particular is formed from high-pressure polyurethane. Filter element (10) according to one of Claims 1 to 16 , wherein the radial seal (40) is designed as a plastic foam seal and is formed in particular of free-foaming polyurethane. Filter element (10) for filtering a fluid, in particular further developed by features of at least one of Claims 1 to 17 , comprising at least one filter bellows (12) having a designated raw side (50) and a designated clean side (52) opposite thereto, wherein the filter bellows (12) peripherally has a frame (28) with an outer edge (32) in which openings ( 30), through which openings (30) sealing material of a radial seal (40) extends, which has at least one sealing surface (42, 44) such that an introduction of force via the at least one sealing surface (42, 44) on a sealing line of the frame (28) is provided laterally offset from the openings (30). Filter system (100) for filtering a fluid, with a filter housing (108) and in the filter housing (108) between a raw side (50) and a clean side (52) interchangeable filter element (10), according to one of the preceding claims. Filter system (100) after Claim 20 wherein the filter housing (108) has a housing bottom (112) and a housing top (114), the housing bottom (112) and the housing top (114) sealingly cooperating with the filter element. Filter system (100) after Claim 20 wherein the filter housing (108) sealingly cooperates the housing top (114) with the filter element. Use of a filter element according to Claim 1 to 18 and / or a filter system according to Claim 19 to 21 for filtering a fluid, in particular for air filtering, in particular in an air filter of an internal combustion engine or in an interior air filter, in particular a motor vehicle, in particular for Motoransaugluftfilterung, or Gebäudeluftfilterung or Innenraumluftfilterung.

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