Filter element and filter device

Abstract

The invention relates to a filter element (1) comprising a filter bellows (10) which is arranged about a longitudinal axis (L) and at least partially encloses an interior (11) and has a first end face (101) and a second end face (102) opposite the first end face. The filter element (1) further comprises an end plate (12) at the first end face, which is open toward the interior (11) and on which at least one peripheral sealing profile (14) is arranged, which extends from the end plate (12) open toward the interior (11) in the direction of the longitudinal axis (L). The outer periphery (103) and / or the inner periphery (104) of the filter bellows (10) has at least one gap (105, 106). The peripheral sealing profile (14) has at least one locally limited protrusion or recess (141, 142) with respect to the radial direction (R) in the region of the gap (105, 106) of the filter bellows (10), wherein the protrusion or recess (141, 142) of the sealing profile (14) is arranged along the periphery such that its position corresponds to the peripheral position of the gap (105, 106) of the filter bellows (10).

Description

[0001] This patent application claims priority to German Patent Application No. DE 10 2023 129 023.1, which was filed with the German Patent and Trademark Office on October 23, 2023, and the contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to a filter element for filtering fluids, particularly for air filtration systems, especially for intake air filtration systems for fuel cells or internal combustion engines. Furthermore, this invention relates to a filtration device having such a filter element.

[0003] In fuel cells and / or internal combustion engines, intake air is typically purified by an air filter to remove particulate and / or gaseous contaminants before entering the cathode space or combustion chamber. For this purpose, air filter elements are used. Furthermore, the air flowing into the vehicle cabin is now also purified of contaminants as thoroughly as possible. Possible contaminants include particulate matter, pollen, soot, or aerosols.

[0004] Generally, a filter element or filter insert is understood as a device component that is replaceable as a whole, can be arranged in a filter housing, and includes at least one filter media body, typically in the form of a pleated filter bellows, and usually also has a structure that carries or supports the filter media, and typically includes seals. The corresponding filter media typically has a limited service life; for this reason, the filter element must be replaced periodically.

[0005] Such filter elements or filter inserts are typically implemented as so-called circular elements, comprising a filter bellows arranged around a longitudinal axis and at least partially surrounding the interior. The filter bellows may be defined at a first end face by an open end plate and at a second end face opposite the first end face by another end plate, particularly a closed end plate. Typically, a circumferential seal is arranged at the open end plate.

[0006] For various reasons, in this context, it may be technically necessary to insert the circular filter element into a predetermined mounting position within the filter housing. For example, in the applications described above, volumetric flow sensors and / or mass flow sensors are typically used to measure the intake air volume. These volumetric and / or mass flow sensors are usually calibrated with respect to a specific mounting position of the circular filter element, which can lead to measurement inaccuracies if the circular filter element is installed outside the predetermined position within the filter housing. This is because the filter media body typically has seams that affect the flow profile at the outlet side. Background Technology

[0007] WO 2019 / 219635 A1 discloses a circular filter element comprising a circumferentially extending filter bellows defined at its respective ends by end plates, wherein at least one of the end plates is an open end plate. The filter bellows particularly comprises a star-shaped pleated filter medium and includes an extended portion at its end near the open end plate on its outer circumference, wherein the extended portion extends only a portion of the total length of the filter bellows. The extended portion of the filter bellows aligns with a corresponding cutout at the outer circumference of the open end plate. At the open end plate, a circumferentially extending seal is also arranged, the circumferentially extending seal extending radially inward from the cutout in a circular shape. Furthermore, a filter housing for receiving the circular filter element is disclosed herein, the filter housing including an internal notch that, in the installed state, engages the extended portion of the filter bellows of the circular filter element to position the circular filter element with respect to an angular position relative to the filter housing.

[0008] In this context, a drawback is that the sealing profile extends over a relatively small diameter, which is detrimental to optimal sealing. Furthermore, the system presented herein is susceptible to misuse because any type of filter element can be installed in the filter housing, for example, after the housing-side notch has been removed.

[0009] Furthermore, WO 2018 / 073198 A1 discloses another filter element that includes an extended portion at the outer circumference of a filter bellows, wherein the filter bellows comprises an elongated oval cross-sectional shape. The filter bellows is defined at its respective ends by end plates, one of which is an open end plate. The filter element is specifically configured to allow fluid to flow radially from the interior to the exterior and includes a grid structure at its outer circumference supporting the filter bellows. At this grid structure, a circumferentially extending, radially projecting sealing carrier is provided, supporting an axial seal, wherein the sealing carrier is spaced axially from the open end plate. The grid structure also includes a radially inwardly projecting positioning element that supports the extended portion and opens radially outward and axially toward the side of the open end plate, such that blades provided at the filter housing can engage the positioning element. Summary of the Invention

[0010] In view of this background art, the object of the present invention is to provide a filter element that enables a clearly defined installation position in a filter housing and includes an improved sealing effect.

[0011] This objective is achieved by a filter element having the features of claim 1 and a filter device having the features of claim 16. Other embodiments of the invention are the subject of the dependent claims and the embodiments of the invention described below.

[0012] The first aspect of the invention relates to a filter element configured for filtering fluids, and in particular, to an air filter element for an air filtration system, especially for an intake air filtration system for a fuel cell or internal combustion engine. However, it is also possible, in principle, that the filter element according to the invention can be a liquid filter element.

[0013] According to a first embodiment, the filter element according to the invention includes a filter bellows arranged about a longitudinal axis and at least partially surrounding an interior, wherein the filter bellows includes a first end face and a second end face positioned opposite to it. Furthermore, the filter element includes an end plate at the first end facing an interior opening and an additional end plate, particularly a closed end plate, at the second end positioned opposite to it. At least one circumferential sealing profile is arranged at the end plate facing the interior opening, rising from the end plate facing the interior opening in a direction along the longitudinal axis. The filter bellows includes at least one notch at its outer circumference and / or inner circumference. The circumferential sealing profile includes at least one partially restricted protrusion or recess relative to the radial direction in the region of the notch in the filter bellows, wherein the protrusion or recess of the circumferential sealing profile is arranged circumferentially such that its position corresponds to the circumferential position of the notch in the filter bellows. In this document, "first end" and "second end" specifically refer to the ends of the filter bellows that are opposite to each other relative to the longitudinal axis.

[0014] The term "filter bellows" in its broadest sense encompasses any type of filter media body, including at least one filter media that can be present in a folded or non-folded form. The filter media can be, in particular, particulate or gaseous filter media. Optionally, the filter media may include at least one adsorbent, particularly activated carbon. Filter media implemented as particulate filter media may, in particular, include nonwoven materials, especially nonwoven materials of synthetic fibers and / or cellulose fibers.

[0015] The filter bellows allows fluid to flow, particularly radially, from the outside to the inside, so that the clean side can exist, particularly in the region inside surrounded by the filter bellows. However, in some embodiments, radial flow from the inside to the outside is also possible, so that the raw side can exist in the region inside surrounded by the filter bellows.

[0016] The protrusions or recesses of the sealing profile are arranged circumferentially such that their positions “correspond” to the circumferential positions of the notches in the filter bellows. In particular, this means that the circumferential positioning of the protrusions or recesses of the sealing profile corresponds to the circumferential positioning of the notches in the filter bellows. In other words, the protrusions or recesses of the sealing profile are arranged at the circumferential positions where the notches in the filter bellows also exist. To express it differently, the circumferential position of the maximum local deviation of the sealing profile from its basic shape in the region of the protrusion or recess can coincide with the circumferential position of the lowest position of the notch observed in the radial direction. However, small angular deviations between the circumferential positions of the protrusions or recesses of the sealing profile and the circumferential positions of the notches in the filter bellows are possible, such that, for example, alignment errors of up to 20°, and especially up to 15°, can still be referred to as “corresponding” arrangements. Such small alignment errors are generally unavoidable due to tolerances in production.

[0017] The filter element according to the invention is particularly a circular filter element. In this context, the filter bellows may particularly include a closed cross-section. The cross-sectional shape of the filter media body may, for example, be selected from the group consisting of: circular, oval, elongated oval, and kidney-shaped.

[0018] The filter bellows can, in particular, comprise a straight prism or an oblique prism shape, wherein its first and second ends form corresponding bottom and cover surfaces of the prism. Specifically, the filter bellows can have a hollow cylindrical shape.

[0019] The filter bellows can, in particular, completely surround the interior in the circumferential direction, wherein the initially free circumferential ends during manufacturing can be interconnected to form an "endless" filter bellows in the circumferential direction. However, in some embodiments, it is also possible that adapter parts can be arranged between the initially free circumferential ends during manufacturing, which interconnect the initially free circumferential ends. In this context, the adapter parts can, in particular, be present at circumferential locations coinciding with the circumferential locations of the notches.

[0020] As an alternative or additional method, the filter bellows may also be widened along the longitudinal axis from the first end toward the second end or vice versa, so that, for example, the whole tube produces a conical shape.

[0021] On the one hand, the filter element according to the invention is characterized by improved sealing performance, since the sealing profile can be guided along an optimal basic shape across the main portion of the circumference, and locally restricted protrusions or recesses exist only in the region of the notch in the filter bellows. On the other hand, the asymmetrical structure of the sealing profile about the longitudinal axis makes it possible to have an additional angular orientation of the filter element relative to the filter housing, which functionally complements the extended portion of the bellows and thus significantly reduces the possibility of incorrectly inserting the filter element into the filter housing when deviating from a predetermined angular position.

[0022] In the case of a notch at the inner circumference of the filter bellows, the circumferential sealing profile includes a partially restricted protrusion, particularly relative to the radial direction, wherein the protrusion of the sealing profile is arranged circumferentially such that its position corresponds to the circumferential position of the notch at the inner circumference of the filter bellows.

[0023] In the case of a notch at the outer circumference of the filter bellows, the circumferential sealing profile includes a partially confined recess, particularly relative to the radial direction, wherein the recess of the sealing profile is arranged circumferentially such that its position corresponds to the circumferential position of the notch at the outer circumference of the filter bellows.

[0024] According to another embodiment, the filter bellows may include a plurality of folds, the radially outer edges of which are positioned at an outer wall surface, and the radially inner edges of which are positioned at an inner wall surface. In this context, a notch may be formed by an unfolded portion of at least one fold of the filter bellows at the inner and / or outer circumference.

[0025] The folds in the filter bellows can be, in particular, in the form of star-shaped folds, wherein the folds, especially, can have a constant cross-sectional shape across the main portion of the circumference. These folds can also be presented as V-shaped folds, wherein the fold height remains the same across the circumference. Alternatively, these folds can also be presented as so-called W-shaped folds, with intermediate folds having a reduced fold height. In the region of the notch provided by the unfolded portion at the inner and / or outer circumference, at least one fold is widened. "Widening" is specifically understood to mean that the distance between the edges of the folds adjacent to the bottom or tip of the fold is increased compared to adjacent folds.

[0026] According to another embodiment, the end plate facing the internal opening may include at least one cut that corresponds to and is aligned with a notch in the filter bellows.

[0027] In the case of a notch at the outer circumference of the filter bellows, the notch may be located specifically at the outer circumference of the end plate facing the inward opening and extends inward with a radial component. In the case of a notch at the inner circumference of the filter bellows, the notch may be located specifically at the inner circumference of the end plate facing the inward opening and extends outward with a radial component.

[0028] The cut penetrates the material of the open end plate. The term "cut" serves only as a means of describing the structure of this device component and does not imply a particular type of manufacturing; in particular, the term should not be construed as limited to "cutting" manufacturing. In this context, "alignment" of the cut corresponding to the notch in the filter bellows with at least one notch specifically means that the circumferential positioning of the cut corresponds to the circumferential positioning of the notch in the filter bellows. In other words, the cut is arranged at a circumferential location where the notch in the filter bellows also exists. To express it differently, the circumferential position of the lowest point of the cut observed in the radial direction can coincide with the circumferential position of the lowest point of the notch observed in the radial direction. However, a small angular deviation between the circumferential position of the cut in the open end plate and the circumferential position of the notch in the filter bellows is possible, such that an alignment error of up to 20°, and particularly up to 15°, can still be referred to as a "corresponding arrangement." Such small alignment errors are generally unavoidable due to manufacturing tolerances.

[0029] In several embodiments, the notch may be present at least at the first end of the filter bellows. This means that the notch is present at least at the end of the filter bellows arranged toward the end plate with the internal opening.

[0030] In this context, it is possible that the notch extends across the total extension of the filter bellows along the longitudinal axis, or that the notch is shorter than the total extension of the filter bellows along the longitudinal axis, and in particular exists only in the longitudinal portion of the filter bellows near the first end.

[0031] In embodiments where the notch is formed by the unfolded portion of at least one fold of the filter bellows at the inner and / or outer circumference, the unfolded portion may in particular exist only in the longitudinal portion of the filter bellows near the first end, wherein, particularly in the longitudinal portion of the filter bellows away from the first end, the unfolded portion returns to a uniform fold shape corresponding to the fold shape of the plurality of folds of the filter bellows.

[0032] According to another embodiment, the circumferential sealing profile may have a predetermined basic shape, wherein the circumferential path of the circumferential sealing profile in the region of the locally confined protrusion or recess deviates from the predetermined basic shape. The predetermined basic shape may be, in particular, a circular shape. However, other basic shapes are also possible, such as, for example, an oval or flat oval shape. The “basic shape” is understood to be the path of the sealing profile in the plane of the first end of the filter bellows or in the plane of the end plate toward the internal opening in the circumferential section without protrusions or recesses.

[0033] In several embodiments, the end plate facing the inward opening may comprise or be made of a plastic material, particularly a foamed plastic material, particularly polyurethane foam, wherein, in particular, the circumferential sealing profile is a single piece together with the end plate facing the inward opening. The end plate facing the inward opening may be connected to the first end of the filter bellows, particularly by material fusion, particularly by welding, gluing, or foaming thereon.

[0034] In an advantageous manner, the circumferential sealing profile, together with the end plate facing the internal opening, can be produced in a casting process using a foamable and flowable plastic material, so that the provision of the protrusions or recesses of the sealing profile does not incur additional manufacturing costs.

[0035] According to another embodiment, the filter element may include a fluid-permeable support grid disposed on the inner circumference of the filter bellows, the fluid-permeable support grid particularly including radial protrusions extending into a notch present on the inner circumference of the filter bellows.

[0036] In this context, the radial protrusions of the support grid arranged on the inner circumference of the filter bellows are specifically used to support the notch present on the inner circumference of the filter bellows, so as to stabilize the notch and / or keep the notch open.

[0037] Fluid-permeable support grids may comprise or be made of plastic materials, particularly injection-molded plastic materials. The radial protrusions of the support grids arranged on the inner circumference of the filter bellows may, in particular, be a single piece together with the support grids.

[0038] According to another embodiment, the filter bellows may include at least two circumferentially spaced notches at its outer and / or inner circumference, wherein the circumferential sealing profile includes locally restricted protrusions or recesses in the region of the notches of the filter bellows relative to the radial direction. In this context, the respective protrusions or recesses of the sealing profile are arranged circumferentially such that their positions correspond to the circumferential positions of the respective notches of the filter bellows.

[0039] By providing more than one notch on the outer and / or inner circumference of the filter bellows, combined with corresponding locally restricted protrusions or recesses in the sealing profile, the forced predetermined mounting position within the filter housing can be further improved. Furthermore, by altering the circumferential arrangement of the notches in the filter bellows and the corresponding protrusions or recesses in the sealing profile, application-specific coding of the interface between the filter element and the filter housing can be achieved.

[0040] In several embodiments, it is particularly likely that there is a notch at the inner circumference of the filter bellows and a second notch at the outer circumference. The notch at the inner circumference and the notch at the outer circumference may be spaced apart, particularly in the circumferential direction.

[0041] In this context, in the region of the notch at the inner circumference of the filter bellows, the circumferential sealing profile includes a partially restricted protrusion relative to the radial direction, wherein the protrusion of the sealing profile is arranged circumferentially such that its position corresponds to the circumferential position of the notch at the inner circumference of the filter bellows.

[0042] In this context, in the region of the notch at the outer circumference of the filter bellows, the circumferential sealing profile includes a partially confined recess relative to the radial direction, wherein the recess of the sealing profile is arranged circumferentially such that its position corresponds to the circumferential position of the notch at the outer circumference of the filter bellows.

[0043] According to another embodiment, the end plate facing the inward opening may include cuts corresponding to notches at the filter bellows and aligned with one of the notches in the filter bellows. In this context, the notch at the outer circumference of the filter bellows may be specifically associated with the cut at the outer circumference of the opening end plate, and the notch at the inner circumference of the filter bellows may be associated with the cut at the inner circumference of the opening end plate.

[0044] Finally, according to another embodiment, the circumferential sealing profile may include at least one circumferential radial sealing surface, particularly at the inner circumference.

[0045] Alternatively, the circumferential sealing profile may include two or more radial sealing surfaces, for example, a first radial sealing surface at the inner circumference and a second radial sealing surface at the outer circumference. Alternatively or additionally, it is possible that the circumferential sealing profile, particularly at its end face, includes at least one axial sealing surface. The sealing profile may include a predetermined sealing profile (radial section), which may include one or more sealing strands extending, particularly parallel to each other. However, the invention is explicitly limited to a particular direction of sealing action and / or certain sealing profiles. Alternatively, any sealing profile that appears suitable to those skilled in the art may be used.

[0046] A second aspect of the invention relates to a filtration device comprising a filter housing having a fluid inlet and a fluid outlet and a receiving space for a filter element, wherein the filter element according to a first aspect of the invention is arranged in the receiving space such that it separates a raw side associated with the fluid inlet and a clean side associated with the fluid outlet.

[0047] Filtration equipment can be, in particular, air filtration equipment, especially intake air filtration equipment for fuel cells or internal combustion engines, or cabin air filtration equipment. Filter housings can be, in particular, air filter housings.

[0048] According to another embodiment, the filter housing may include at least one circumferential housing sealing surface, on which a circumferential sealing profile of the filter element rests, wherein the housing sealing surface includes at least one partially restricted protrusion or recess corresponding to at least one partially restricted protrusion or recess of the circumferential sealing profile of the filter element.

[0049] The filter housing may have a two-part construction, comprising a housing tank and a housing cover, with a receiving space existing within the housing tank and the housing cover releasably connected to the housing tank. In this context, a housing sealing surface may be present at the housing tank or at the housing cover.

[0050] In this context, the interaction between the housing sealing surface and the circumferential sealing profile of the filter element represents the functional primary interface between the filter housing and the filter element. The primary interface can only fulfill its main function of sealing and isolating the raw and clean sides when the housing sealing surface matches the structure of the circumferential sealing profile of the filter element. Specifically, the housing sealing surface may at least partially have the shape of the female mold of the sealing profile of the filter element.

[0051] Since the housing sealing surface and the circumferential sealing profile of the filter element are not rotationally symmetric about the longitudinal axis, the predetermined installation position of the filter element in the filter housing relative to the longitudinal axis may have been reliably forced by the interaction between the filter element and the filter housing at the main interface.

[0052] Alternatively or additionally, the filter housing may include at least one housing protrusion extending into the receiving space, the housing protrusion being received in at least one notch of the filter element.

[0053] By combining a housing sealing surface having at least one partially restricted protrusion or recess (on which the circumferential sealing profile of the filter element rests) with a housing protrusion received in at least one notch of the filter element, the installation position of the filter element predetermined relative to the longitudinal axis can be forced in the best possible manner, thereby substantially eliminating improper use of the filter equipment.

[0054] It should be understood that the features, combinations of features, and specific advantages disclosed in the first aspect of the invention can be applied to the second aspect of the invention, and vice versa.

[0055] Other possible embodiments of the invention include combinations of features not explicitly mentioned in the description of the embodiments above or below. In this context, those skilled in the art will also add individual aspects as improvements or additions to the corresponding basic forms of the invention.

[0056] The invention will be explained in more detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0057] In this context, as shown in the following figure: Figure 1 This is an isometric view of the filter element according to the invention based on the first embodiment; Figure 2 This is a longitudinal section of the filter element according to the invention based on the first embodiment; Figure 3 This is a plan view of the filter element according to the invention according to the first embodiment from the side of the open end plate; Figure 4 This is an isometric exploded view of the filtration device according to the invention based on the first embodiment; Figure 5 This is an isometric view of the filtration device according to the invention based on the first embodiment; Figure 6 This is a plan view of the filtration device according to the invention, based on the first embodiment, from the side of the fluid outlet; Figure 7 This is a longitudinal section of the filtration device according to the invention based on the first embodiment; Figure 8 yes Figure 7 Details X; Figure 9 It is based on Figure 7 The cross section BB; Figure 10 This is an isometric view of the filter element according to the invention based on the second embodiment; Figure 11 This is a longitudinal section of the filter element according to the invention based on the second embodiment; Figure 12 This is a plan view of the filter element according to the invention according to the second embodiment from the side of the open end plate; Figure 13 This is an isometric exploded view of the filtration device according to the present invention based on the second embodiment; Figure 14 This is an isometric view of the filtration device according to the invention based on the second embodiment; Figure 15 This is a plan view of the filtration device according to the invention, based on the second embodiment, from the side of the fluid outlet; Figure 16 This is a longitudinal section of the filtration device according to the invention based on the second embodiment; Figure 17 yes Figure 16 Detail C; Figure 18 It is based on Figure 16 The cross section BB; Figure 19 This is an isometric view of the filter element according to the invention based on the third embodiment; Figure 20 This is a plan view of the filter element according to the invention according to the third embodiment from the side of the open end plate; Figure 21 This is an isometric exploded view of the filtration device according to the invention based on the third embodiment; Figure 22 This is an isometric view of the filter housing portion of the filtration device according to the invention, based on a third embodiment; and Figure 23 This is a cross-sectional view of the filtration device according to the invention based on the third embodiment. Detailed Implementation

[0058] Figure 1A filter element 1 according to the invention, based on a first embodiment of the invention, is shown for filtering fluids, particularly for air filtration systems, especially for intake air filtration systems of fuel cells or internal combustion engines. The filter element is a circular filter element, with its filter bellows 10 comprising a hollow cylindrical shape. The filter element 1 includes a filter bellows 10 arranged around a longitudinal axis L, the filter bellows 10 surrounding an interior 11. The filter bellows 10 has a first end face 101 and a second end face 102 positioned opposite to it. An end plate 12 opening toward the interior 11 is arranged at the first end face 101, wherein the opening of the open end plate 12 is in fluid communication with the interior 11. A further end plate 13 is arranged at the second end face 102, the further end plate 13 being, in particular, a closed end plate 13. At least one circumferential sealing profile 14 is arranged at the end plate 12 opening toward the interior 11, the circumferential sealing profile 14 completely surrounding the opening in the open end plate 12 circumferentially. The circumferential sealing profile 14 rises from the end plate 12, which opens toward the interior 11, along the longitudinal axis L.

[0059] The filter bellows 10 includes a notch 105 at its outer circumference 103. In the region of the notch 105 at the outer circumference 103 of the filter bellows 10, the circumferential sealing profile 14 has a partially restricted recess 141 relative to the radial direction R, wherein the recess 141 of the sealing profile 14 is arranged circumferentially such that its position corresponds to the circumferential position of the notch 105 at the outer circumference 103 of the filter bellows 10.

[0060] The filter bellows 10 includes a plurality of folds 100, with the radially outer edges of the folds 100 positioned on the outer wall surface and the radially inner edges of the folds 100 positioned on the inner wall surface. The edges of the folds 100 extend substantially parallel to the longitudinal axis L. A notch 105 at the outer circumference 103 of the filter bellows 10 is formed at the outer circumference by an unfolded portion 107 of at least one fold 100 of the filter bellows 10 (see [link to relevant documentation]). Figure 9 ).

[0061] The folds 100 of the filter bellows 10 are in particular star-shaped folds, wherein the folds may have a uniform cross-sectional shape across the main portion of the circumference. At least one fold 100 is widened in the area of ​​a notch 105 provided by the unfolded portion 107 at the outer circumference 103.

[0062] The end plate 12, which faces an inward opening, has a cutout 121 on its outer circumference, corresponding to and aligned with a notch 105 on the outer circumference 103 of the filter bellows 10. The cutout 121 can be understood as a localized material notch in the open end plate 12, extending radially inward from the outer circumference of the open end plate 12. The cutout comprises two opposing cutout walls, which extend at an acute angle relative to each other.

[0063] A notch 105 at the outer circumference 103 of the filter bellows 10 is located at the first end 101 of the filter bellows 10 and is shorter than the total extension of the filter bellows 10 in the direction of the longitudinal axis L. Specifically, the notch 105 exists only in the length portion of the filter bellows 10 near the first end 101. In the length portion of the filter bellows 10 away from the first end 101, the notch 105, provided as an unfolded portion 107, returns to a uniform fold shape corresponding to the fold shape of the plurality of folds 100 of the filter bellows 10. This can be seen in the figure by means of the tapering structure of the unfolded portion 107 in the direction of the second end 102.

[0064] The basic shape of the circumferential sealing profile 14 is a circle, wherein the circumferential path of the circumferential sealing profile 14 deviates from the circular shape in the region of the locally restricted recess 141. The locally restricted recess 141 forms a nose that protrudes inward away from the circular shape. The open end plate 12 comprises or is made of plastic material, particularly foamed plastic material, particularly polyurethane foam. The circumferential sealing profile 14 is a single piece, particularly together with the end plate 12 facing inward opening. The end plate 12 facing inward opening is connected to the first end 101 of the filter bellows 10, particularly by material fusion, particularly welding, gluing or foaming thereon.

[0065] A fluid-permeable support grid 15 is arranged at the inner circumference 104 of the filter bellows 10. The fluid-permeable support grid 15 is specifically configured to resist the differential pressure generated when the filter bellows 10 flows radially from the outside to the inside (clean side in the inside 11). The fluid-permeable support grid 15 can be embedded in the material of the open end plate 12 at the first end 101, and in particular, can be surrounded by the foamed plastic material of the open end plate 12.

[0066] Multiple fold stabilizers 109 are arranged on the outer circumference 103 of the filter bellows 10, surrounding the filter bellows 10. The fold stabilizers 109 are spaced apart from each other relative to the longitudinal axis L. The fold stabilizers 109 support the folds 100 of the filter bellows 10 and maintain their shape, which is particularly important in the event of a sudden liquid load on the filter element 1, which is implemented as an air filter element. The fold stabilizers 109 may be, for example, threads or yarns glued to the tips of the folds of the filter bellows 10.

[0067] The circumferential sealing profile 14 may include a circumferential radial sealing surface 143, which is located at the inner circumference.

[0068] exist Figure 2 In the longitudinal section, the notch 105, which is constructed as an expanded portion 107 at the outer circumference 103 of the filter bellows 10, can be seen more clearly; furthermore, the partially confined recess 141 of the circumferential sealing profile 14 relative to the radial direction R is arranged circumferentially such that its position corresponds to the circumferential position of the notch 105 at the outer circumference 103 of the filter bellows 10. In particular, it can be seen that the distance of the circumferential sealing profile 14 from the longitudinal axis L on the left side of the diagram is smaller than that on the right side of the diagram.

[0069] The notch 105 formed by the unfolded portion 107 at the outer circumference 103 of the filter bellows 10 includes an intermediate fold, the base of which extends obliquely relative to the longitudinal axis.

[0070] Figure 3 A plan view of the filter element 1 according to the first embodiment from the side of the open end plate 12 is shown, wherein the additional end plate 13 (here, the closed end plate) can be seen through the interior 11.

[0071] Figure 4 An isometric exploded view of a filtration device 200 according to the invention based on a first embodiment is shown. The filtration device 200 includes a filter housing 20 having a fluid inlet 21 at a first housing portion 201 (particularly a housing tank 201) and a fluid outlet 22 at the first housing portion 201. The first housing portion 201, configured as a housing tank 201, provides a receiving space 23 for a filter element 1, which, in the installed state, is arranged in the receiving space 23 such that it separates the raw side associated with the fluid inlet 21 and the clean side associated with the fluid outlet 22.

[0072] The first housing portion 201 includes a circumferential housing sealing surface 24, which allows the circumferential sealing profile 14 of the filter element 1 to contact the circumferential housing sealing surface 24 (see [reference]). Figure 7The housing sealing surface 24 includes a partially confined recess corresponding to a partially confined recess 141 of the circumferential sealing profile 14 of the filter element 1. Furthermore, the first housing portion 201 includes a housing protrusion 25 projecting into the receiving space 23. In the installed state, the housing protrusion 25 can be received in a notch 105 at the outer circumference 103 of the filter element 1, such that the filter element 1 is clearly positioned within the first housing portion 201 with respect to its mounting position around the longitudinal axis L.

[0073] The filter housing 20 also includes a second housing portion 202 in the form of a housing cover 202, which is detachably connected to the first housing portion 201 to close the receiving space 23.

[0074] Figure 5 The filter device 200 is shown in an installed state, wherein the inserted filter element 1 and the second housing portion 202 are detachably connected to the first housing portion 201.

[0075] exist Figure 6 The diagram, viewed from the side of fluid outlet 22, is a plan view of the filtration device 200 according to the invention of the first embodiment, wherein the interior 11 of the filter element 1 and its additional end plate 13 are visible through fluid outlet 22. A housing protrusion 25 extends radially inward from the outer wall of the first housing portion 201 and includes a predetermined extension in the direction of the longitudinal axis, such that the extension can pass through a cut 121 in the open end plate 12 of the filter element 1 and enter a notch 105, implemented as an unfolded portion 107, at the outer circumference of the filter element 1. The housing protrusion 25 includes two protrusion walls that are opposite to each other and positioned at an acute angle relative to each other, resulting in, for example, a housing protrusion 25 having an overall triangular shape.

[0076] exist Figure 7 , Figure 8 and Figure 9 In the middle, one can see even more clearly the engagement of the housing protrusion 25 with the cut 121 at the outer circumference of the open end plate 12 of the filter element 1 in the notch 105 (constructed as an unfolded portion 107) at the outer circumference 103 of the filter element 1.

[0077] In addition, Figure 9The diagram, even more clearly, illustrates a structure where the outer circumference 103 of the filter element 1 is configured as a notch 105 of an expanded portion 107. The folds 100 of the filter bellows 10 are present in the form of star-shaped folds, wherein the folds 100 have a uniform cross-sectional shape across the main portion of the circumference. In the region provided by the expanded portion 107 at the notch 105 at the outer circumference 103, one fold 100 is widened, meaning that the distance between the edge of the fold adjacent to the bottom or tip of the fold at the outer circumference is increased compared to adjacent folds, allowing the housing protrusion 25 to engage therein.

[0078] Figure 10 An isometric view of the filter element 1 according to the invention according to a second embodiment is shown. With respect to its basic structure, the filter element 1 according to the invention according to the second embodiment is very similar to the filter element 1 according to the first embodiment, such that only the differences will be explained.

[0079] In the region of the notch 106 at the inner circumference 104 of the filter bellows 10, the circumferential sealing profile 14 has a partially restricted protrusion 142 relative to the radial direction R, wherein the protrusion 142 of the sealing profile 14 is arranged in the circumferential direction such that its position corresponds to the circumferential position of the notch 106 at the inner circumference 104 of the filter bellows 10.

[0080] The notch 106 at the inner circumference 104 of the filter bellows 10 is formed at the inner circumference 104 by the unfolded portion 108 of at least one fold 100 of the filter bellows 10 (see [reference]). Figure 18 The fold 100 of the filter bellows 10 is particularly shaped as a star-shaped fold, wherein the fold may span the main portion of the circumference and have a uniform cross-sectional shape. At least one fold 100 is widened in the area of ​​the notch 106 provided by the unfolded portion 108 at the inner circumference 104.

[0081] The end plate 12, facing inward opening, has a cutout 122 on its circumference, which corresponds to and is aligned with a notch 106 at the inner circumference 104 of the filter bellows 10. The cutout 122 can be understood as a local material notch in the open end plate 12, extending outward from the inner circumference of the open end plate 12 with a radial component R. The cutout 122 includes two opposing cutout walls that extend at an acute angle relative to each other.

[0082] A notch 106 at the inner circumference 104 of the filter bellows 10 is located at the first end 101 of the filter bellows 10 and is shorter than the total extension of the filter bellows 10 in the direction of the longitudinal axis L. Specifically, the notch 106 exists only in the longitudinal portion of the filter bellows 10 near the first end 101. In the longitudinal portion of the filter bellows 10 away from the first end 101, the notch 106, which is provided as an unfolded portion 108, returns to a uniform fold shape corresponding to the fold shape of the plurality of folds 100 of the filter bellows 10. This can be seen in the figure by means of the tapering structure of the unfolded portion 108 in the direction of the second end 102.

[0083] The basic shape of the circumferential sealing profile 14 is a circle, wherein the circumferential path of the circumferential sealing profile 14 deviates from the circular shape in the region of the locally restricted protrusion 142. The locally restricted protrusion 142 forms a nose that protrudes outward away from the circular shape.

[0084] A fluid-permeable support grid 15 is arranged at the inner circumference 104 of the filter bellows 10. The fluid-permeable support grid 15 is specifically configured to resist the differential pressure generated when flow flows radially from the outside to the inside (clean side in the interior 11). The fluid-permeable support grid 15 can be embedded in the material of the open end plate 12 at the first end 101, particularly in a foamed plastic material. The fluid-permeable support grid 15 includes radial protrusions 151 that project into notches 106 present at the inner circumference 104 of the filter bellows 10 to support the notches 106.

[0085] exist Figure 11 In the longitudinal section, the notch 106, which is constructed as an expanded portion 108 at the inner circumference 104 of the filter bellows 10, can be seen more clearly; furthermore, the partially restricted protrusion 142 of the circumferential sealing profile 14 relative to the radial direction R is arranged circumferentially such that its position corresponds to the circumferential position of the notch 106 at the inner circumference 104 of the filter bellows 10. In particular, it can be seen that the distance of the circumferential sealing profile 14 from the longitudinal axis L on the right side of the diagram is greater than that on the left side of the diagram.

[0086] The notch 105 of the inner circumference 104 of the filter bellows 10, which is provided as an unfolded portion 108, includes an intermediate fold, the base of which extends obliquely relative to the longitudinal axis.

[0087] Figure 12 The diagram shows a plan view of the filter element 1 according to the second embodiment from the side of the open end plate 12, wherein another end plate 13 (here, the closed end plate) can be seen through the interior 11.

[0088] Figure 13 An isometric exploded view of a filtration device 200 according to the invention according to a second embodiment is shown. Regarding its basic construction, the filtration device 200 according to the invention according to the second embodiment is very similar to the filtration device 200 according to the first embodiment, such that only the differences will be explained. Deviating from the first embodiment, the first housing portion 201 includes a housing protrusion 25 that protrudes into a receiving space 23 and, in the installed state, can be received in a notch 106 at the inner circumference 104 of the filter element 1, such that the filter element 1 is clearly positioned in the first housing portion 201 with respect to its mounting position about the longitudinal axis L. The housing protrusion 25 is specifically arranged adjacent to the inner circumference of the fluid outlet 22 and extends outward with a radial component, and includes a predetermined extension in the direction of the longitudinal axis, such that this extension can engage the notch 106 at the inner circumference 104 of the filter element 1, which is configured as an expanded portion 108, through a cut 122 of the open end plate 12 of the filter element 1.

[0089] Figure 14 The filter device 200 is shown in an installed state, wherein the inserted filter element 1 and the second housing portion 202 are releasably fastened to the first housing portion 201, wherein the housing protrusion 25 is configured as a notch 106 of the unfolded portion 108 at the inner circumference 104 of the filter element 1.

[0090] exist Figure 15 The diagram shows a plan view of the filter device 200 according to the invention according to the second embodiment, with the fluid outlet 22 visible from the side. The interior 11 of the filter element 1 and its additional end plate 13 are visible through the fluid outlet 22.

[0091] exist Figure 16 , Figure 17 and Figure 18 In the middle, it can be seen even more clearly that the housing protrusion 25 is joined in the notch 106 of the unfolded portion 108 at the inner circumference 104 of the inner circumference 104 of the filter element 1 through the cut 122 at the inner circumference of the open end plate 12 of the filter element 1.

[0092] In addition, Figure 18 The diagram, or even better, illustrates a structure where the inner circumference 104 of the filter element 1 is provided as a notch 106 of the unfolded portion 108. The fold 100 of the filter bellows 10 exists in the form of a star-shaped fold, wherein the fold 100 has a uniform cross-sectional shape across the main portion of the circumference. In the region provided by the unfolded portion 108 at the notch 106 in the inner circumference 104, the fold 100 is widened, meaning that the distance between the fold edge adjacent to the bottom or tip of the fold at the inner circumference 104 is increased compared to adjacent folds, allowing the housing protrusion 25 to engage therein.

[0093] Figure 19 An isometric view of the filter element 1 according to the invention according to a third embodiment is shown. Regarding its basic construction, the filter element 1 according to the invention according to the third embodiment is very similar to the filter element 1 according to the first and second embodiments, such that only the differences will be explained.

[0094] The filter bellows 10 includes a notch 105 at its outer circumference 103. In the region of the notch 105 at the outer circumference 103 of the filter bellows 10, the circumferential sealing profile 14 has a partially restricted recess 141 relative to the radial direction R, wherein the recess 141 of the sealing profile 14 is arranged circumferentially such that its position corresponds to the circumferential position of the notch 105 at the outer circumference 103 of the filter bellows 10.

[0095] The filter bellows 10 includes a plurality of folds 100, with the radially outer edges of the folds 100 located on the outer wall surface and the radially inner edges of the folds 100 located on the inner wall surface. The edges of the folds 100 extend substantially parallel to the longitudinal axis L. A notch 105 at the outer circumference 103 of the filter bellows 10 is formed at the outer circumference 103 by an unfolded portion 107 of at least one fold 100 of the filter bellows 10 (see [link to relevant documentation]). Figure 23 ).

[0096] The end plate 12 facing the inward opening has a cutout 121 in its outer circumference, which corresponds to and is aligned with a notch 105 at the outer circumference 103 of the filter bellows 10. In the region of the notch 106 at the inner circumference 104 of the filter bellows 10, the circumferential sealing profile 14 also has a partially restricted protrusion 142 relative to the radial direction R, wherein the protrusion 142 of the sealing profile 14 is arranged in the circumferential direction such that its position corresponds to the circumferential position of the notch 106 at the inner circumference 104 of the filter bellows 10.

[0097] The notch 106 at the inner circumference 104 of the filter bellows 10 and the notch 105 at the outer circumference 103 of the filter bellows 10 are spaced apart from each other in the circumferential direction.

[0098] The end plate 12 facing the inward opening has a cutout 122 on its inner circumference, which corresponds to and is aligned with a notch 106 on the inner circumference 104 of the filter bellows 10.

[0099] The basic shape of the circumferential sealing profile 14 is a circle, wherein the circumferential path of the circumferential sealing profile 14 deviates from the circular shape in the regions of the partially restricted protrusions 142 and the partially restricted recesses 141. The partially restricted protrusions 142 form a nose that protrudes outward away from the circular shape. The partially restricted recesses 141 form a nose that protrudes radially inward away from the circular shape.

[0100] The fluid-permeable support grid 15 includes a radial protrusion 151 that protrudes into a notch 106 at the inner circumference 104 of the filter bellows 10 to support the notch 106.

[0101] Figure 20 The diagram shows a plan view of the filter element 1 according to the third embodiment from the side of the open end plate 12, wherein another end plate 13 (here, the closed end plate) can be seen through the interior 11.

[0102] Figure 21 An isometric exploded view of a filtration device 200 according to the invention according to a third embodiment is shown. Regarding its basic construction, the filtration device 200 according to the invention according to the third embodiment is very similar to the filtration devices 200 according to the first and second embodiments, such that only the differences will be explained. The first housing portion 201 includes a first housing protrusion 25 projecting into the receiving space 23, which, in the installed state, can be received in a notch 106 at the inner circumference of the filter element 1. Furthermore, the first housing portion 201 includes a second housing protrusion 25 projecting into the receiving space 23, which, in the installed state, can be received in a notch 105 at the outer circumference 103 of the filter element 1.

[0103] Figure 22 An isometric view of a first filter housing portion 201 of the filtration device according to the invention, based on a third embodiment, is shown. The first filter housing portion 201 is particularly a housing tank 201 having a receiving space 23 for a filter element 1. The first housing portion 201 includes two housing protrusions 25, wherein a first housing protrusion 25, in the installed state, is received in a notch 106 at an inner circumference 104 of the filter element 1, and a second housing protrusion 25, in the installed state, is received in a notch 105 at an outer circumference 103 of the filter element 1. A housing sealing surface 24 includes a partially restricted protrusion corresponding to a partially restricted protrusion 142 of the circumferential sealing profile 14 of the filter element 1. Furthermore, the housing sealing surface 24 includes a partially restricted recess corresponding to a partially restricted recess 141 of the circumferential sealing profile 14 of the filter element 1. The protrusions and recesses of the housing sealing surface 24 are spaced apart from each other in the circumferential direction.

[0104] exist Figure 23 The diagram further illustrates, more specifically, the structure of the notch 105 at the outer circumference 103 of the filter element 1, which is configured as an unfolded portion 107. The fold 100 of the filter bellows 10 is presented in the form of a star-shaped fold, wherein the fold 100 has a uniform cross-sectional shape across the main portion of the circumference. In the region of the notch 105 provided by the unfolded portion 107 at the outer circumference, the fold 100 is widened so that the second housing protrusion 25 can engage therein.

[0105] Furthermore, it can be seen that the inner circumference 104 of the filter element 1 is configured as a notch 106 of the unfolded portion 108. In the region of the notch 106 provided by the unfolded portion 108 at the inner circumference 104, the fold 100 is widened so that the first housing protrusion 25 can be engaged therein.

[0106] The reference numerals used in the accompanying drawings are as follows: 1. Filter element 10. Filter bellows 100 folds 101 End face first end 102 End face second end 103 Outer circumference 104 Inner circumference 105. Notch at the outer circumference 106. Notch at the inner circumference 107 The unfolded portion at the outer circumference 108 The unfolded portion at the inner circumference 109 Folding section stabilizing device 11 Internal 12 End plates with inward openings 121. Cut at the outer circumference 122. Incision at the inner circumference 13 Other end plates, especially closed end plates 14 Circumferential Sealing Profile 141 Recess of circumferential sealing profile 142 Protrusion of circumferential sealing profile 143 Radial sealing surface 15 Supporting grilles 151 Protrusion 200 filtration equipment 20 Filter housing 201 Shell Tank 202 Housing cover 21 Fluid inlet 22 Fluid outlet 23 Acceptance Space 24. Housing sealing surface 25. Shell protrusion L longitudinal axis R radial direction

Claims

1. A filter element (1) for filtering fluids, particularly for air filtration systems, especially for intake air filtration systems of fuel cells or internal combustion engines, comprising a filter bellows (10) arranged around a longitudinal axis (L), the filter bellows (10) at least partially surrounding an interior (11), wherein, The filter bellows (10) includes a first end face (101) and a second end face (102) positioned opposite each other, as well as an end plate (12) at the first end face (101) opening toward the interior (11) and an additional end plate (13), particularly a closed end plate (13), at the second end face (102), wherein at least one circumferential sealing profile (14) is arranged at the end plate (12) opening toward the interior (11), the at least one circumferential sealing profile (14) rising from the end plate (12) opening toward the interior (11) along the longitudinal axis (L). Its features The filter bellows (10) includes at least one notch (105, 106) at its outer circumference (103) and / or inner circumference (104). The circumferential sealing profile (14) includes at least one partially restricted protrusion or recess (141, 142) in the region of the notch (105, 106) of the filter bellows (10) relative to the radial direction (R), wherein the protrusion or recess (141, 142) of the sealing profile (14) is arranged in the circumferential direction such that its position corresponds to the circumferential position of the notch (105, 106) of the filter bellows (10).

2. The filter element (1) according to claim 1, wherein, The filter bellows (10) includes a plurality of folds (100), the radially outer edges of the plurality of folds (100) being positioned on the outer wall surface, and the radially inner edges of the plurality of folds (100) being positioned on the inner wall surface, wherein the notches (105, 106) are formed by the unfolded portions (107, 108) of at least one fold (100) of the filter bellows (10) at the inner circumference and / or outer circumference.

3. The filter element (1) according to claim 1 or 2, wherein, The end plate (12) facing the internal opening includes at least one cut (121, 122) that corresponds to and is aligned with a notch (105, 106) in the filter bellows (10).

4. The filter element (1) according to any one of the preceding claims, wherein, The notches (105, 106) are present at least at the first end (101) of the filter bellows (10).

5. The filter element (1) according to any one of the preceding claims, wherein, The notches (105, 106) extend along the longitudinal axis (L) across the total extension range of the filter bellows (10).

6. The filter element (1) according to any one of the preceding claims, wherein, The notches (105, 106) are shorter than the total extension of the filter bellows (10) in the direction of the longitudinal axis (L), and in particular exist only in the longitudinal portion of the filter bellows (10) near the first end (101).

7. The filter element (1) according to any one of the preceding claims, wherein, The circumferential sealing profile (14) includes a predetermined basic shape, and wherein the circumferential sealing profile (14) deviates from the predetermined basic shape in the circumferential path of the circumferential path in the region of the locally restricted protrusion or recess (141, 142).

8. The filter element (1) according to claim 7, wherein, The predetermined basic shape is a circle.

9. The filter element (1) according to any one of the preceding claims, wherein, The filter bellows (10) comprises a hollow cylindrical structure and, in particular, completely surrounds the interior (11) in the circumferential direction.

10. The filter element (1) according to any one of the preceding claims, wherein, The end plate (12) that opens toward the interior (11) comprises or is made of plastic material, particularly foamed plastic material, particularly polyurethane foam, wherein, in particular, the circumferential sealing profile (14) is a single piece together with the end plate (12) that opens toward the interior (11).

11. The filter element (1) according to any one of the preceding claims, wherein, The filter element (1) includes a fluid-permeable support grid (15) arranged at the inner circumference (104) of the filter bellows (10), and in particular includes a radial protrusion (151) that protrudes into a notch (106) present at the inner circumference (104) of the filter bellows (10).

12. The filter element (1) according to any one of the preceding claims, wherein, The filter bellows (10) includes at least two notches (105, 106) spaced apart in the circumferential direction at its outer circumference and / or inner circumference (103, 104), and wherein the circumferential sealing profile (14) includes locally restricted protrusions or recesses (141, 142) in the region of the notches (105, 106) of the filter bellows (10) relative to the radial direction (R), wherein the respective protrusions or recesses (141, 142) of the sealing profile (14) are arranged in the circumferential direction such that their positions correspond to the circumferential positions of the respective notches (105, 106) of the filter bellows (10).

13. The filter element (1) according to claim 12, wherein, The first notch (106) is located at the inner circumference (104) of the filter bellows (10), and the second notch (105) is located at the outer circumference (103) of the filter bellows (10).

14. The filter element (1) according to claim 12 or 13, wherein, The end plate (12) opening toward the interior (11) includes cutouts (121, 122) that correspond to notches (105, 106) of the filter bellows (10) and are aligned with one notch (105, 106) of the filter bellows (10).

15. The filter element (1) according to any one of the preceding claims, wherein, The circumferential sealing profile (14) provides at least one circumferential radial sealing surface (143) in particular at the inner circumference.

16. A filtration device (200) comprising a filter housing (20) having a fluid inlet (21) and a fluid outlet (22) and a receiving space (23) for filter elements arranged in the receiving space (23) such that it separates a raw side associated with the fluid inlet (21) and a clean side associated with the fluid outlet (22), characterized in that, The filter element is the filter element (1) according to any one of the preceding claims.

17. The filtration device (200) according to claim 16, wherein, The filter housing (20) includes at least one circumferential housing sealing surface (24), and the circumferential sealing profile (14) of the filter element (1) rests on the at least one circumferential housing sealing surface (24), wherein the housing sealing surface (24) includes at least one partially restricted protrusion or recess, the at least one partially restricted protrusion or recess corresponding to at least one partially restricted protrusion or recess (141, 142) of the circumferential sealing profile (14) of the filter element (1).

18. The filtration device (200) according to claim 16 or 17, wherein, The filter housing (20) includes at least one housing protrusion (25) that protrudes into the receiving space (23) and is received in at least one notch (105, 106) of the filter element (1).

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