Filtration element, filtration system housing, and filtration system including a filtration element and housing

Abstract

The present invention relates to a filter element (10) for filtering a fluid, particularly a gaseous fluid, having a longitudinal axis (L), a filter bellows (12) arranged on a support tube (70) about the longitudinal axis (L), a first axial end (20) and a second axial end (30) arranged opposite the first axial end (20), at least one of the end portions (20, 30) including an end plate (22, 32), and the filter bellows The filter element (12) has a notch (40) in at least one of its end faces (20, 30), and the support tube (70) has a support structure (81) at at least one end (20, 30) having the notch (40) extending radially away from the support tube (70) and including at least two wings (82, 83), the support structure (81) being integrated into the end plates (22, 32) on either side of the notch (40). The present invention further relates to a filtration system (100) comprising the filter element (10) and a housing (102) for the filtration system (100).

Description

[Technical Field]

[0001] The present invention relates to a filtering element, a filtering system housing, and a filtering system, particularly an air filtering system, including a filtering element and a housing. [Background technology]

[0002] The intake air of an internal combustion engine is usually purified of contaminants by an air filter before entering the combustion chamber of the engine. The air filter elements used for this purpose may comprise a star-shaped filter material with an annular longitudinal axis. In the internal combustion engines of commercial vehicles, such as large trucks, such filter elements may have lengths of 300 mm or more, especially 500 mm or more. The filter element must be securely fastened to the filter housing. The filter element becomes clogged with particles filtered from the air during operation and therefore requires periodic replacement.

[0003] German Patent Application Publication No. 102013014498 discloses a filtering element comprising a filter body concentric with a longitudinal axis, a first end plate disposed on an end face, and a second end plate disposed on the opposite end face. At least one of the end plates includes a centering element disposed about the longitudinal axis and reinforced by a reinforcing element. This allows the filtering element to be centered and / or supported at least radially when installed in a housing. The centering element also includes an annular body and a support element disposed on the annular body and extending in the longitudinal direction. The support element is configured to contact the inner cover contour of the housing for axial support of the filtering element. Because the filtering element includes the centering element reinforced by the reinforcing element, the bending stiffness of the centering element is increased compared to conventional protruding clamping protrusions, such as knobs on the end plates of a closed filtering element that are pressed axially or bent radially inward in a pure polyurethane construction.

[0004] German Patent Application Publication No. 102019109202 discloses a filter element including a filter bellows with a notched end plate. A notch protrudes axially from the end plate into the filter bellows. The notch is axially wedge-shaped and includes two curved wings that meet at the center of the notch and extend symmetrically outward from their contact surface. The notch in the end plate axially engages between two folds of the filter bellows, spreading them apart in an axial wedge-like fashion. Summary of the Invention

[0005] An object of the present invention is to provide a filter element that can be easily replaced even in a small installation space.

[0006] It is a further object of the present invention to provide a filtration system that allows for easy replacement of the filtration elements.

[0007] A further object of the present invention is to provide a housing for such a filtration system which allows for easy replacement and correct placement of the filtration elements.

[0008] According to one aspect of the present invention, the above-mentioned object is achieved by a filtering element for filtering a fluid, in particular a gaseous fluid, the filtering element having a longitudinal axis, a filter bellows arranged on a support tube centered on the longitudinal axis and surrounding an interior, a first axial end face and a second axial end face arranged opposite the first axial end face, at least one of the end faces comprising an end plate, the filter bellows comprising a folded portion with a radially outer folded end arranged on its outer wall surface, the filter bellows comprising, at at least one of the end face ends, a cutout whose axial length in the longitudinal axis direction is shorter than the length extent of the filter bellows in the longitudinal axis direction, the support tube comprising, at least at the end with the cutout, a support structure comprising at least two wings, the support structure extending radially away from the support tube and integrated into the end plate on both sides of the cutout.

[0009] According to one aspect of the present invention, a further object is solved by a filtration system comprising a housing having an inlet and an outlet, and a replaceable filtration element arranged in the housing, the filtration element being intended for filtering a fluid, in particular a gaseous fluid, the filtration element having a longitudinal axis, a filter bellows arranged around the longitudinal axis and surrounding an interior, a first axial end face and a second axial end face arranged opposite the first axial end face, at least one of the end faces comprising an end plate, the filter bellows comprising a folded portion with a radially outward folded end arranged on its outer wall surface, the filter bellows having, at least one of the end faces, a notch whose axial length in the longitudinal axis direction is shorter than the length range of the filter bellows in the longitudinal axis direction, the support tube having, at least one end with the notch, a support structure comprising at least two wings, the support structure extending radially away from the support tube and integrated into each end plate on both sides of the notch.

[0010] According to one aspect of the invention, a further object is to provide a housing for a filtration system, in which at least one counter element, in particular a corresponding cutout, is provided in the housing part and interacts with a cutout of the filtration element. So it is solved .

[0011] Preferred configurations and advantages of the present invention can be obtained from the accompanying claims, description and drawings.

[0012] A proposed filtering element for filtering a fluid, particularly a gaseous fluid, has a longitudinal axis, a filter bellows arranged on a support tube centered about the longitudinal axis and surrounding an interior, a first axial end face and a second axial end face arranged opposite the first axial end face, at least one of the end faces including an end plate. The filter bellows includes a folded portion with a radially outward folded end arranged on an outer wall surface thereof. The filter bellows has a notch in at least one of the end faces, the axial length in the longitudinal axis direction being shorter than the length range of the filter bellows in the longitudinal axis direction. The support tube has a support structure at at least one end including the notch, the support structure including at least two wings, which extend radially away from the support tube and are integrated into the end plate on both sides of the notch.

[0013] Advantageously, the at least one notch allows the filtering element to be mounted in the correct position. The at least one notch clarifies the positioning of the filtering element. The presence of the at least one notch does not substantially alter the filter surface. Preferably, the filtering element is provided for filtering gaseous fluids, preferably air.

[0014] The folds of the filter bellows are held in place by at least one end plate, which closes and seals the filter bellows at this end. The end plate may be of a closed configuration or may be designed to open towards the interior of the filtration element. Typically, filtration elements are provided with end plates at both ends, one of which is designed as a closed end and the other as an open end. This allows the fluid to be filtered to flow from the outside through the wall of the filter bellows into the interior. The filtered fluid can then flow out again from the interior through the open end plate and exit the filtration system. . end The board may be made conventionally, for example from foamed polyurethane (PUR).

[0015] The end plates include cutout structures that correspond to the cutouts formed in the folds of the filter bellows. This cutout allows the filter element to be positioned correctly in relation to its longitudinal axis on a corresponding counter element with a corresponding cutout in the housing of the filtration system. Because PUR end plates are relatively flexible, if they are not inserted correctly into the housing, they may be pushed or bent by the counter element, causing the folds of the filter bellows to be deformed or damaged in the area of ​​the cutout.

[0016] To minimize this risk, the present invention proposes that the end plate, in particular the cutout structure of the end plate, be mechanically reinforced by a support structure arranged on the support tube of the filter element. This reduces the risk of bending the end plate due to incorrect installation in the filter system housing, thus protecting the fold during installation of the filter element. Thus, installation forces can be directed toward the support tube. The two wings of the support structure are advantageously arranged to effectively reinforce the cutout structure of the end plate.

[0017] According to an advantageous embodiment of the filter element, the support tube has, at least at one end with a notch, a radially outward collar on which the support structure is arranged. The collar allows the end plate, which is typically made of a relatively soft, flexible material such as PUR, to be reinforced in an appropriate manner. This reduces the risk of the filter bellows being damaged, for example, by excessive pressure, during installation and / or operation. In particular, the two wings of the support structure can be arranged in a plane perpendicular to the longitudinal axis with the radially outward protruding collar. This results in a flat annular structure of the collar and the wings of the support structure.

[0018] According to an advantageous embodiment of the filtering element, the two wings of the support structure are arranged symmetrically with respect to the plane of symmetry of the cutout extending along the longitudinal axis, thereby advantageously absorbing forces that may occur on both sides of the cutout structure during installation, and thus advantageously positioning the two wings of the support structure to effectively reinforce the cutout structure of the end plate.

[0019] According to an advantageous embodiment of the filtration system, the two wings of the support structure are of a planar configuration and / or have a radially outwardly tapered shape, in particular a triangular or trapezoidal shape, which allows to effectively reinforce the area of ​​the end plate around the cutout structure while maintaining flexibility in the remaining area of ​​the end plate in order to advantageously separate the uncleaned and cleaned fluid areas inside the housing of the filtration system.

[0020] According to an advantageous embodiment of the filtering element, the two wings of the support structure are arranged in a plane perpendicular to the longitudinal axis with the collar protruding radially outward. This allows the cutout structure and the collar to form a flat structure that is reinforced in the area of ​​the cutout structure. This allows the cutout structure of the filter bellows to be stabilized even if the cutout structure does not axially engage with the filter bellows. This reduces the risk of bending the end plate in the event of incorrect installation in the housing, thereby protecting the folds during installation of the filtering element.

[0021] According to an advantageous embodiment of the filtering element, two wings are arranged on the end plate adjacent to the notch. In particular, the wings can be arranged on the end plate, especially within the material of the end plate, such as PUR. Preferably, the wings are arranged as close as possible to the notch on both sides. This allows advantageous force absorption by the wings, even in a relatively soft and flexible material such as PUR, and advantageously reinforcement by the wings adjacent to the notch. This reduces the risk of damage to the filter bellows during installation and / or operation, for example, due to excessive pressure. Advantageously, the wings of the collar of the end plate are arranged as close as possible to the notch of the filter bellows on both sides.

[0022] According to an advantageous embodiment of the filtering element, the wings are configured to support and absorb circumferential forces that widen the notches, thereby reducing the risk of the filter bellows being damaged during installation and / or operation, for example by excessive pressure.

[0023] According to an advantageous embodiment of the filtering element, the support structure comprises a rib structure with through holes, which ensures advantageous rigidity of the support structure and allows for good fixing of the support structure to the foamed PUR end plates during the manufacturing process of the latter.

[0024] According to an advantageous embodiment of the filtering element, the support structure and / or the radially outward collar of the end with the notch in which the support structure is arranged comprises a positioning rib, which is configured to protrude in the longitudinal direction of the support tube beyond the surface defined by the support structure and / or the collar towards the other end of the support tube.

[0025] The positioning ribs maintain a predetermined longitudinal distance between the end face of the filter bellows and the collar or support structure of the support tube, which is integrated into the end plate during the manufacturing of the filtration element. This allows the filter bellows to be held in a fixed axial position relative to the support tube during the foaming process during the manufacturing of the end plate. This prevents the formation or retention of air bubbles in the PUR end plate in the area between the collar and / or support structure, which could cause leakage between the uncleaned and cleaned areas of the filtration system during operation of the filtration element.

[0026] According to an advantageous embodiment of the filtering element, the positioning ribs are arranged parallel to one another, which allows the manufacturing tool for the support tube to be advantageously designed with a suitable forming direction.

[0027] According to an advantageous embodiment of the filtering system, the positioning ribs arranged on the collar are distributed over the collar surface of the collar, which ensures uniform support of the end faces of the filter bellows on the collar and reduces the risk of tilting the filter bellows during installation.

[0028] According to an advantageous embodiment of the filtering element, the height of the positioning ribs on the surface is at least half the thickness of the support structure in the longitudinal direction. Typical values ​​for the axial rib thickness of the rib structure of the collar and / or support structure can be in the range of 2.5 mm to 3.0 mm. The axial protrusion on the surface formed by the collar and / or support structure is therefore advantageously at least 1.25 mm. A value of approximately 2.5 mm has proven to be very advantageous.

[0029] According to an advantageous embodiment of the filtering element, the folds are held at a constant, in particular equidistant, spacing relative to one another at least in part by fastening elements, in particular screw coils. The filtering element can be manufactured by essentially conventional manufacturing methods.

[0030] According to a further aspect of the present invention, there is provided a filtration system including a housing having an inlet and an outlet, and a replaceable filtration element disposed in the housing, the filtration element being configured to filter a fluid, particularly a gaseous fluid. The filtration system includes a longitudinal axis, a filter bellows centered on the longitudinal axis and surrounding an interior thereof, a first axial end face, and a second axial end face opposite the first axial end face, at least one of the end faces comprising an end plate. The filter bellows includes a folded portion having a radially outward folded end disposed on an outer wall surface thereof. The filter bellows has a notch in at least one of the end faces, the axial length of which in the longitudinal axis direction is shorter than the length of the filter bellows in the longitudinal axis direction. The support tube has a support structure at at least one end having the notch, the support structure including at least two wings extending radially away from the support tube and integrated into each end plate on both sides of the notch.

[0031] Advantageously, the filter element can be held by friction due to the corresponding notches, especially when the filter element is inserted into the housing. When the filter element is inserted into the housing, for example, if the filter element is in an oblique or horizontal position, the friction can counteract the tilt of the filter element. When the filter element is operated with the housing closed, the friction can be eliminated.

[0032] The cover can fix the filter element to the filter housing. In particular, the filter element can be sandwiched between the bottom of the filter housing and the cover in the axial direction. Advantageously, as described above, the axial retention force of the filter element flows through the central tube of the filter element. The first and second end plates of the filter element provide a defined retention force in the axial direction and can set the elastic deformability of the filter element in the longitudinal direction so that the cover can be fully closed. In the radial direction, the filter element can be form-fitted and supported by the filter pot and / or the cover.

[0033] Preferably, the filtration system is provided for filtering a gaseous fluid, preferably air. Preferably, the filtration system is provided to be installed in a vehicle, in particular a commercial vehicle, preferably a heavy commercial vehicle.

[0034] According to an advantageous embodiment of the filtration system, the inlet and the outlet are arranged in the same housing part, which allows the filtration system to be constructed very compactly.

[0035] According to an advantageous embodiment of the filtration system, the support tube comprises, at least at one end with the notch, a radially outward collar on which the support structure is arranged.

[0036] According to an advantageous embodiment of the filtration system, the support structure and / or the radially outward collar of the end having the notch in which the support structure is arranged includes a positioning rib, which is configured to protrude in the longitudinal direction of the support tube beyond the surface defined by the support structure and / or the collar towards the other end of the support tube.

[0037] The positioning ribs maintain a predetermined longitudinal distance between the collar or support structure of the support tube, which is integrated into the end plate, and the end face of the filter bellows during the manufacturing of the filtration element, thereby maintaining a fixed axial position of the filter bellows relative to the support tube during the foaming process of the end plate. This prevents the formation or retention of air bubbles in the PUR end plate in the area between the collar and / or support structure, which could cause leakage between the uncleaned and cleaned areas of the filtration system during operation.

[0038] According to a further aspect of the invention, a housing for a filtration system is proposed, in which at least one counter-element, in particular a corresponding cut-out, is provided in a housing part and interacts with a cut-out in the filtration element.

[0039] Advantageously, the filter element, whether inclined or horizontal, can be positioned correctly in the housing while being protected from tilting, which is particularly advantageous for large filter elements used in commercial vehicles and having a high loaded weight.

[0040] Advantageously, the housing in a compact embodiment has the inlet and outlet in the same housing part, and the clean fluid flow path can also be located in the cover of the housing so that the cover is located on the clean side of the filtration system, which is advantageous for the tight space conditions in commercial vehicles. [Brief explanation of the drawings]

[0041] Further advantages can be obtained from the following description of the drawings, in which embodiments of the invention are shown. The drawings, the description, and the claims contain a number of features in combination. Those skilled in the art can consider these features appropriately and individually and combine them to provide further combinations, as shown below by way of example.

[0042] [Figure 1]1 is an isometric view of a filtration element according to a first embodiment of the present invention having unfolded cutout folds at the ends of the filtration element. [Figure 2] 2 is the filtering element of FIG. 1 with the end plates shown transparent and the support structure disposed in the support tube. [Figure 3] 2 is a plan view of an end plate shown in transparency of the filtering element of FIG. 1; [Figure 4] 2 is an isometric view of a support tube having a support structure for the filtration element of FIG. 1. [Figure 5] FIG. 5 is a plan view of a support tube having the support structure of FIG. 4. [Figure 6] FIG. 1 is a side view of a portion of a filter bellows with a support tube, including detail A. [Figure 7] 7 shows detail A of the filter bellows with support tube of FIG. 6. [Figure 8] 2 is an isometric view of the filtration element of FIG. 1 with a portion of the filtration system housing cut away. [Figure 9] FIG. 1 is an isometric view of a filtration system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0043] In the figures, identical or similar components are designated with identical reference symbols.The figures are merely illustrative and should not be understood as limiting.

[0044] 1-9 illustrate a first embodiment of the present invention, including a filtration element 10 (FIGS. 1-3) and a filter housing 102, and a filtration system 100 (FIGS. 8 and 9).

[0045] FIG. 1 shows an isometric view of a filtration element 10 according to a first embodiment of the present invention having an unfolded fold 14 with a notch 40 at an end 20 of the filtration element 10 .

[0046] As can be seen in FIG. 1, the filtration element 10 extends along a longitudinal axis L and includes a filter bellows 12 surrounding an interior 50 .

[0047] The filter bellows 12 may be made, for example, from folded filter material that is formed into a closed filter bellows 12 and placed on a support tube 70. The support tube 70 may include at least one internal rib 78 (see FIG. 4) to reinforce the body 76 of the support tube 70.

[0048] 1 and 2 only by way of example, the folds 14 extend over the entire length of the filter bellows 12. The longitudinal edges 16 of the folds 14 are arranged on the outer wall surface 18 of the filter bellows 12. In this example, the filter bellows 12 is configured as a circular element.

[0049] The first end 20 of the filter element 10 and the second end 30 thereof are provided with end plates 22, 32 that seal the filter bellows 12 at their edges. The end plates 22, 32 can be made of a conventional material, for example, foamed polyurethane.

[0050] The first end 20 is provided with an end plate 22 that is open towards the interior 50. The oppositely disposed second end 30 is provided with a closed end plate 32.

[0051] The open end plate 22 comprises an outwardly extending ring 26 that surrounds the opening 24 of the end plate 22. The ring 26 can function as a seal. Preferably, the end plate 22 and the ring 26 are designed as one piece. In particular, the end plate with the ring 26 can be made of polyurethane.

[0052] The flow direction of the fluid to be filtered is directed through the filter bellows 12. If the clean side is located inside, the fluid flows from the exterior of the filter bellows 12 to the interior 50 and from there to the exterior of the filtration element 10 through the openings 24. Optionally, the flow direction may be reversed.

[0053] The filter bellows 12 has a notch 40 at its first end 20, the notch 40 having an axial length 42 along the longitudinal axis L that is less than the longitudinal extent of the filter bellows 12. The notch 40 is locally limited and does not extend the entire length of the filter bellows 12. Preferably, the notch 40 has a maximum end-to-end distance at each end plate 22 and tapers away from the end plate 22.

[0054] 1-3, only one notch 40 is seen in first endplate 20. However, filtering element 10 can optionally have a notch, not shown, in second endplate 30 as well.

[0055] The notch 40 increases the distance between two adjacent folds. filter It extends entirely over the entire length of the bellows 12 .

[0056] Preferably, the two notches are arranged opposite each other in the end plate and are spaced apart in the circumferential direction, e.g. filter The notches 40 are offset by 180° on opposite radial sides of the bellows 12. The notches 40 may also be offset from one another by an angle other than 180°.

[0057] Fastening elements 90 may be provided between the notches 40 to maintain a constant distance between the folds 14 in this area. Optionally, conventional fastening elements 90 may be provided, such as threaded coils, adhesive beads, hot melt beads, embossments ("pleat locks") across the longitudinal edges 16 of the folds 14, or the like.

[0058] The notches 40 can be manufactured in different ways. They can be introduced into the filter bellows 12 after the optional fixing elements 90 have been applied. The notches 40 can be introduced into the filter bellows 12 during the manufacture of the end plates 22, 32, or by inserts, expansion elements, etc., provided in the support tube. The two notches 40 in the filter bellows 12 can be formed in the same way or in different ways.

[0059] Figure 2 shows the end plate22 1, with the support structure 81 disposed in the support tube 70. In FIG. 3, the end plates of the filter element 10 of FIG. 1 are shown in transparent form. 22 can be seen in plan view.

[0060] At the end 20 of the support tube 70, which includes the notch 40, the support structure 81 includes at least two wings 82, 83 extending radially away from the support tube 70 and integrated into the end plates 23, 32 on either side of the notch 40. In this regard, the support tube 70 includes a radially outwardly directed collar 80 at the end 20 of the notch 40, on which the support structure 81 is arranged. The two wings 82, 83 of the support structure 81 are arranged symmetrically with respect to the plane of symmetry of the notch 40, which extends along the longitudinal axis L. The two wings 82, 83 of the support structure 81 are planar and have a trapezoidal shape tapering radially outward. Alternatively, the wings 82, 83 can be designed, for example, triangular. For mechanical reinforcement, the support structure 81 includes a rib structure 84 with through holes 88.

[0061] The support structure 81 disposed on the support tube 70 of the filter element 10 is an end plate 22 , especially the end plates 22 This provides mechanical reinforcement to the cutout structure 72 of the end plate 102, preventing it from being damaged by incorrect installation in the housing 102 of the filtration system 100. 22 Advantageously, the two wings 82, 83 of the support structure 81 protect the end plates 14 from mechanical pressure during installation of the filtration element 10 in the housing 102 of the filtration system 100. 22 The cutout structure 72 can be arranged to effectively reinforce the cutout structure 72.

[0062] In particular, the two wings 82, 83 of the support structure 81, together with the radially outwardly directed collar 80, are arranged in a plane perpendicular to the longitudinal axis L. The wings 82, 83 do not protrude axially into the filter bellows 12 but are located at the level of the end plate 22.

[0063] The two wings 82, 83 are arranged to adjoin the notch 40 as closely as possible on either side. The wings 82, 83 are configured to support and absorb the circumferential forces that widen the notch 40. To this end, the rib structure 84 of the wings 82, 83 advantageously stiffens them.

[0064] Figure 4 is an isometric view of support tube 70 with support structure 81, and Figure 5 is a plan view of support tube 70 with support structure 81. In these figures, it can be seen that wings 82, 83 of support structure 81 are disposed on a circumferential collar 80 extending radially outward at the end of support tube 70. Also visible is the flat annular arrangement of collar 80 and wings 82, 83. Wings 82, 83 of support structure 81 extend substantially radially.

[0065] 4 and 5, it can be seen that at the end 20 having the notch 40 in which the support structure 81 is located, the support structure 81 and the radially outward collar 80 are provided with positioning ribs 86, 87. The positioning ribs 86, 87 are configured to protrude in the longitudinal direction L of the support tube 70 beyond a surface 89 defined by the support structure 81 and the collar 82 towards the other end 30 of the support tube 70.

[0066] Locating ribs 86, 87 allow the end plates 10 to be positioned during manufacture of the filtration element 10. 22 It is possible to maintain a predetermined distance L in the longitudinal direction between the collar 80 or support structure 81 of the support tube 70 integrated with the end plate 12 and the end face of the filter bellows 12. 22 The foaming process during manufacture of the filter element 10 allows the filter bellows 12 to be held in a fixed axial position relative to the support tube 70. This prevents leakage between the uncleaned and cleaned areas of the filtration system 100 during operation of the filtration element 10 in the area between the PUR end plate 12 and the collar 80 and / or the support structure 81. 22 This can prevent air bubbles from forming in the area and remaining attached to this area.

[0067] As can be seen particularly in Figure 5, the positioning ribs 86, 87 are arranged parallel to one another, which allows the manufacturing tool for the support tube 70 to be advantageously designed with a suitable forming direction.

[0068] The positioning ribs 87 arranged on the collar 80 are distributed over the collar surface of the collar 80. This ensures uniform support of the end faces of the filter bellows 12 on the collar 80 and reduces the risk of the filter bellows 12 tilting during installation.

[0069] FIG. 6 is a side view of a portion of filter bellows 12 with support tube 70, with detail A shown, and FIG. 7 is a corresponding view of detail A of filter bellows 12 with support tube 70 of FIG. 6.

[0070] Note that in this view, the filter bellows 12 is cross-sectional. Department and , the support structure 81 protrudes from the inside of the filter bellows 12. In particular, in Fig. 7 it can be seen that in the gap between the collar 80 and the filter bellows, a predetermined distance between the collar 80 or the support structure 81 and the end face 91 of the filter bellows 12 can be adjusted by positioning ribs 86, 87 arranged on the collar 80 and the support structure 81.

[0071] To ensure sufficient clearance between surface 89 and end face 91 of filter bellows 12 to prevent air bubbles from being trapped between collar 80 and filter bellows 12 during the manufacturing process of end plate 22, height 92 of positioning rib 87 above surface 89 is advantageously at least half the thickness 94 of support structure 81 in longitudinal direction L. Typical values ​​for the axial rib thickness of rib structure 84 of collar 80 and / or support structure 81 may range from 2.5 mm to 3.0 mm. Thus, the axial protrusion on surface 89 formed by collar 80 and / or support structure 81 is advantageously at least 1.25 mm. A value of approximately 2.5 mm has been found to be very advantageous.

[0072] 8, the filtering element 10 is shown in a cutaway view of the housing 102 of the filtering system 100. The housing portion 104 is shown as a quarter segment to show the counter-element 120 arranged in the housing portion 104 of the cutout 40 of the filtering element 10. If the filtering element is mispositioned, for example rotated about its longitudinal axis L, this counter-element 120 can exert a force on the end plate 22, which can cause deformation of the fold 14 of the filter bellows 12 in the area of ​​the cutout 40. In this view, the cutout 40 of the filtering element 10 is not visible because it is covered by the counter-element 120 of the housing portion 104.

[0073] FIG. 9 is an isometric view of a filtration system 100 according to an embodiment of the present invention. In the mounting arrangement of the filtration system 100, two housing parts 104, 106 are joined at a joining region 105, for example by screwing. The housing part 106, configured as a cover, allows the filtration system 100 to be closed after the insertion of the filtration element 10. The inlet 110 and outlet 112 of the housing 102 are arranged in the same housing part 104; the inlet is configured for radial inflow of the filtration element 10, while the outlet 112 allows the clean fluid to exit longitudinally. The outlet 112 is integrated into a socket 114 in the housing part 104. A counter element 120 can be seen in the housing part 104, adjacent to the outlet 112, relative to the notch 40 of the filtration element 10. This counter element 120 allows the filtration element 10 to be positioned in a predetermined orientation with respect to the longitudinal axis L. The counter element 120 is formed in the housing part 104 as a corresponding notch and interacts in a suitable manner with the notch 40 of the filter element 10 .

[0074] Also visible in the housing part 106 is a counter-element 122 relative to a further cutout in the filtering element 10, which allows the filtering element 10 to be positioned in a predetermined orientation with respect to the longitudinal axis L. The counter-element 122 is formed as a corresponding cutout in the housing part 106 and interacts in a suitable manner with the corresponding cutout in the filtering element 10. [Explanation of symbols]

[0075] 10 filtration element 12 Filter Bellows 14 Folding section 16 Folded Edge 18 Wall 20 First end 22 End plate 24 End plate opening 26 Seals, rings 30 Second end 32 End plate 40 Notch 42 length 50 internal 70 support tube 7 2. Notched structure 76 Main Unit 78 Inner rib 80 colors 81 Support structure 82 Wings 83 Wings 84 Rib structure 86 Positioning rib 87 Positioning rib 88 Through Hole 89 Surface 90 Fixed Elements 91 End face 92 height 94 Thickness 100 Filtration System 102 Housing 104 Housing part 105 Connection 106 Housing part 110 Inlet 112 Outlet 114 sockets 120 Notched counter element 122 Notch counter element L Longitudinal axis

Claims

1. A filtration element (10) for filtering a fluid, comprising: The filter bellows (12) has a longitudinal axis (L), is disposed on a support tube (70) and is centered about the longitudinal axis (L) and surrounds an interior (50), has an end surface first axial end (20), and has an end surface second axial end (30) disposed opposite the end surface first axial end (20), At least one of the ends (20, 30) includes an end plate (22, 32); The filter bellows (12) includes a plurality of folds (14) on an outer wall surface (18) thereof, the folds having radially outward fold ends (16) disposed thereon; The filter bellows (12) has a notch (40) at at least one of its end surface ends (20, 30) whose axial length (42) in the longitudinal axis (L) direction is shorter than the length range of the filter bellows (12) in the longitudinal axis (L) direction, The notch (40) is configured to widen the distance between the radially outer folded ends (16) of two adjacent folded portions of the plurality of folded portions (14), the support tube (70) has a support structure (81) at the at least one end (20, 30) having the notch (40) including at least two wings (82, 83), the support structure (81) extending radially away from the support tube (70) and being integrated into the end plates (22, 32) on both sides of the notch (40); One of the at least two blades (82, 83) is provided on the opposite side of the other blade (83) across the notch (40) in the circumferential direction of the support tube (70). Filtration element.

2. 2. The filtering element of claim 1, wherein the support tube has a radially outward collar on the at least one end having the notch, the collar having the support structure disposed thereon.

3. A filtration element (10) for filtering a fluid, comprising: The filter bellows (12) has a longitudinal axis (L), is disposed on a support tube (70) and is centered about the longitudinal axis (L) and surrounds an interior (50), has an end surface first axial end (20), and has an end surface second axial end (30) disposed opposite the end surface first axial end (20), At least one of the ends (20, 30) includes an end plate (22, 32); The filter bellows (12) includes a plurality of folds (14) on an outer wall surface (18) thereof, the folds having radially outward fold ends (16) disposed thereon; The filter bellows (12) has a notch (40) at at least one of its end surface ends (20, 30) whose axial length (42) in the longitudinal axis (L) direction is shorter than the length range of the filter bellows (12) in the longitudinal axis (L) direction, The notch (40) is configured to widen the distance between the radially outer folded ends (16) of two adjacent folded portions of the plurality of folded portions (14), the support tube (70) has a support structure (81) at the at least one end (20, 30) having the notch (40) including at least two wings (82, 83), the support structure (81) extending radially away from the support tube (70) and being integrated into the end plates (22, 32) on both sides of the notch (40); the support tube (70) has, at the at least one end (20, 30) having the notch (40), a radially outward collar (80) on which the support structure (81) is disposed; The two wings (82, 83) of the support structure (81) together with the radially outward collar (80) are arranged in a plane perpendicular to the longitudinal axis (L) of the filtering element.

4. 3. A filtering element according to claim 2, wherein the two wings (82, 83) of the support structure (81) together with the radially outward collar (80) are arranged in a plane perpendicular to the longitudinal axis (L).

5. 5. The filtering element according to claim 1, wherein the two wings (82, 83) of the support structure (81) are arranged symmetrically with respect to a plane of symmetry of the notch (40) extending along the longitudinal axis (L).

6. The filtering element according to any one of claims 1 to 5, wherein the two wings (82, 83) of the support structure (81) are of a planar configuration and / or have a shape tapering radially outward.

7. The filtering element according to any one of claims 1 to 6, wherein the two wings (82, 83) are arranged on the end plates (22, 32) so as to be adjacent to the notches (40).

8. A filtering element according to any one of the preceding claims, wherein the wings (82, 83) are configured to support and absorb circumferential forces that widen the notches (40).

9. The filtration element of any one of claims 1 to 8, wherein the support structure (81) includes a rib structure (84) having through holes (88).

10. A filtration element (10) for filtering a fluid, comprising: The filter bellows (12) has a longitudinal axis (L), is disposed on a support tube (70) and is centered about the longitudinal axis (L) and surrounds an interior (50), has an end surface first axial end (20), and has an end surface second axial end (30) disposed opposite the end surface first axial end (20), At least one of the ends (20, 30) includes an end plate (22, 32); The filter bellows (12) includes a plurality of folds (14) on an outer wall surface (18) thereof, the folds having radially outward fold ends (16) disposed thereon; The filter bellows (12) has a notch (40) at at least one of its end surface ends (20, 30) whose axial length (42) in the longitudinal axis (L) direction is shorter than the length range of the filter bellows (12) in the longitudinal axis (L) direction, The notch (40) is configured to widen the distance between the radially outer folded ends (16) of two adjacent folded portions of the plurality of folded portions (14), the support tube (70) has a support structure (81) at the at least one end (20, 30) having the notch (40) including at least two wings (82, 83), the support structure (81) extending radially away from the support tube (70) and being integrated into the end plates (22, 32) on both sides of the notch (40); The support structure (81) and / or the radially outward collar (80) of the end (20, 30) having the notch (40) in which the support structure (81) is arranged includes positioning ribs (86, 87), and the positioning ribs (86, 87) are configured to protrude toward the other end (30, 20) of the support tube (70) in the longitudinal direction (L) of the support tube (70) beyond a surface (89) defined by the support structure (81) and / or the collar (80).

11. 10. The filtering element according to claim 1, wherein the support structure (81) and / or the radially outward collar (80) of the end (20, 30) having the notch (40) in which the support structure (81) is arranged includes positioning ribs (86, 87), which are configured to protrude in the longitudinal direction (L) of the support tube (70) beyond a surface (89) defined by the support structure (81) and / or the collar (80) toward the other end (30, 20) of the support tube (70).

12. 12. A filtering element according to claim 10 or 11, wherein the positioning ribs (86, 87) are arranged parallel to one another.

13. 13. A filtering element according to any one of claims 10 to 12, wherein the positioning ribs (87) arranged on the collar (80) are distributed over the collar surface of the collar (80).

14. 14. A filtration element according to any one of claims 10 to 13, wherein a height (92) of the positioning ribs (87) on the surface (89) is at least half the thickness (94) of the support structure (81) in the longitudinal direction (L).

15. A filtering element according to any one of the preceding claims, wherein the folds (14) are held at regular intervals relative to one another at least in part by fastening elements (90).

16. A filtration system (100) comprising: a housing (102) having an inlet (110) and an outlet (112); and a replaceable filtration element (10) according to any one of claims 1 to 15, disposed in the housing (102), The filtering element (10) is provided for filtering a fluid and has a longitudinal axis (L), a filter bellows (12) centered about the longitudinal axis (L) and surrounding an interior (50), a first axial end (20) at an end surface, and a second axial end (30) at an end surface opposite the first axial end (20), At least one of the ends (20, 30) includes an end plate (22); The filter bellows (12) includes a folded portion (14) having a radially outer folded end (16) disposed on an outer wall surface (18) thereof, The filter bellows (12) has a notch (40) at at least one of its end surface ends (20, 30) whose axial length (42) in the longitudinal axis (L) direction is shorter than the length range of the filter bellows (12) in the longitudinal axis (L) direction, The support tube (70) has a support structure (81) including at least two wings (82, 83) at at least one end (20, 30) having the notch (40), the support structure (81) extending radially away from the support tube (70) and being integrated into each end plate (22, 32) on both sides of the notch (40).

17. 17. The filtration system of claim 16, wherein the support tube (70) has a radially outward collar (80) on the at least one end (20, 30) having the notch (40) and on which the support structure (81) is disposed.

18. 18. A filtration system as claimed in claim 16 or 17, wherein the support structure (81) and / or the radially outward collar (80) of the end (20, 30) having the notch (40) in which the support structure (81) is arranged includes positioning ribs (86, 87), which are configured to protrude in the longitudinal direction (L) of the support tube (70) beyond a surface (89) defined by the support structure (81) and / or the collar (80) towards the other end (30, 20) of the support tube (70).

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