Filter device for gaseous medium, filter element, use of filter element and method for assembling filter device

Abstract

The invention relates to a filter device (10) for a gaseous medium. The filter device (10) comprises a filter housing (26) having at least one inlet opening (168) for the gaseous medium to be cleaned and having at least one outlet opening (40) for the cleaned gaseous medium. The filter element (16) is arranged in the filter housing (26). The filter housing (26) comprises a first housing part (12), the first housing part (12) comprises a filter element receiving space (36), and a filter element (16) is arranged in the filter element receiving space. The filter housing (26) comprises a second housing part (18), at which the at least one inlet opening (168) is arranged, and which comprises a part (162) of at least one cyclone separator (166). The second housing part (18) closes a service opening (34) in the first housing part (12), and the first and second housing parts (12, 18) are releasably connected to each other. The filter element (16) has, on the side facing the second housing part (18), a seal (96) which extends about the axis (22) and has a circumferential sealing part with a radial sealing effect. A radially outer circumferential side of the sealing portion sealingly bears against a radially inner transverse surface (86) of the first housing portion (12). A rib (164), which is at least partially circumferential and protrudes from the second housing portion (18) in the axial direction, applies pressure on the seal (96) in order to press the seal portion onto the inner transverse surface of the first housing portion (12).

Description

TECHNICAL FIELD

[0001] The present invention relates to a filter device for gaseous media, in particular for air, comprising a filter housing having at least one inlet opening for the gaseous medium to be purified and at least one outlet opening for the purified gaseous medium, wherein at least one filter element is arranged in the filter housing with respect to the gas flow between the at least one inlet opening and the at least one outlet opening in such a way that it separates an uncleaned side associated with the inlet opening from a cleaned side associated with the outlet opening, said filter element comprising at least one filter medium body, wherein the filter housing comprises a first housing part at which the at least one outlet opening is arranged and which comprises at least one filter element receiving space in which the at least one filter element is arranged, and wherein the filter housing comprises a second housing part at which the at least one inlet opening is arranged and which comprises at least a part of a cyclone, wherein the second housing part encloses a service opening of the first housing part and the first and second housing parts are releasably connected to each other and detachable from each other in order to enable removal of the at least one filter element through the service opening of the first housing part.

[0002] Furthermore, the present invention relates to a filter element for a filter device for gaseous media, in particular for air, in particular for a filter device according to the present invention, comprising at least one filter medium body, wherein the filter device comprises a filter housing having at least one inlet opening and at least one outlet opening, wherein the filter element is receivable in the filter housing between the inlet opening and the outlet opening in order to separate an uncleaned side associated with the at least one inlet opening from a cleaned side associated with the at least one outlet opening, and wherein the filter housing comprises a first housing part at which the outlet opening is arranged and which comprises at least one filter element receiving space in which the at least one filter element is receivable, and wherein the filter housing comprises a second housing part at which the inlet opening is arranged and which comprises at least a part of a cyclone, - wherein the second housing part closes the service opening of the first housing part, and the first housing part and the second housing part are releasably connected to each other and detachable from each other in order to enable removal of the at least one filter element through the service opening of the first housing part.

[0003] Furthermore, the present application relates to the use of a filter element in a filter device for gaseous media according to the present application, the filter element comprising at least one filter medium body.

[0004] Furthermore, the present application relates to a method for assembling a filter device for gaseous media, in particular a filter device according to the present application, wherein at least one filter element is inserted through a service opening into a filter element receiving space of a first housing part of a filter housing of the filter device, the first housing part comprising at least one outlet opening for the gaseous media to be cleaned, subsequently the service opening is closed by a second housing part of the filter housing, the second housing part comprising at least one inlet opening for the gaseous media to be cleaned and at least a part of at least one cyclone. BACKGROUND

[0005] US 2021 / 0077932 A1 discloses an air filter assembly comprising a housing having a main body, an access cover, an airflow inlet, and an airflow outlet. Furthermore, it comprises an air filter cartridge operably disposed in the housing, wherein an axial compression seal is pre-tensioned against the main body by the access cover.

[0006] The present application has the object of designing a filter device, a filter element, a use of a filter element, and a method for assembling a filter device of the aforementioned type, wherein the filter device can be improved, in particular with regard to functionality, installation and / or assembly. SUMMARY

[0007] The filter device according to the present application solves this object in that: The at least one filter element comprises a seal extending circumferentially around a virtual axis at an inflow side facing the second housing part, the seal comprising a sealing section acting at least partially radially sealingly with respect to the axis and extending circumferentially around the axis, wherein a radially outer circumferential side of the sealing section with respect to the axis is tightly sealingly abutted at a radially inner inner wall surface of the first housing part with respect to the axis, The rib extending at least partially circumferentially around the axis and projecting in an axial direction with respect to the axis with at least one directional component from the second housing part exerts a contact pressure on the circumferential seal to press the circumferentially extending sealing section acting at least partially radially sealingly against the inner wall surface of the first housing part.

[0008] According to the application, the second housing part comprises a circumferential rib, which exerts a contact pressure on the circumferential seal when the filter device is assembled. Due to the contact pressure, the circumferential sealing section, which acts at least partially radially sealingly, is pressed against the inner wall surface of the first housing part. In this way, the filter element receiving space is sealed with respect to the environment by means of the seal. Furthermore, the unclean side of the filter element is separated in this way from the clean side.

[0009] By means of the sealing section, which acts at least partially in the radial direction, it is achieved that, in the non-clamped state of the first housing part with respect to the second housing part, the sealing surface of the seal on the part of the at least one filter element comprises a gap, in particular a radial gap, with respect to the corresponding surface of the filter housing, i.e. the inner wall surface of the first housing part. Only by clamping the second housing part to the first housing part is the circumferential sealing section pressed against the inner wall surface of the first housing part. In this way, a sealing action is produced between the first housing part, the second housing part and the filter element. Furthermore, the cyclone block comprising the at least one cyclone is axially sealed with respect to the axis by means of the seal.

[0010] Overall, the structure of the filter device according to the application makes it possible for the filter element to be simply installed in the filter housing without force effects occurring. The clamping of the seal can be achieved by means of the axial clamping action of the first housing part at the second housing part. For this purpose, leverage of a suitable closure element can be utilized.

[0011] By means of the seal, it is possible to prevent particles and / or water from entering between the at least one filter element and the filter housing into the clean side. Furthermore, it is also possible to prevent particles and / or water from entering into the region between the at least one filter element and the second housing part, in particular the immersion tube plate and / or the cyclone block.

[0012] The filter device and the filter element can be used in vehicles, in particular motor vehicles, in construction and / or agricultural machinery, in compressors, in connection with internal combustion engines, in cathode filters, in particular in connection with fuel cells.

[0013] The gaseous medium to be purified can be air. In this context, the filter device can also be referred to as an air filter device. By means of the filter device, it is possible to remove solid or liquid particles from the gaseous medium.

[0014] The axis can coincide with a housing axis of the filter housing, a mounting / removal axis of the filter element in the first housing part, a connection axis of the first housing part and the second housing part and / or an element axis of the filter element. When the specification mentions "radial", "coaxial", "axial", "tangential", "circumferential", "concentric", "eccentric" and the like, this relates to the axis, if nothing else is mentioned. In the context, "circumferential" means a virtual wall surface around the axis. The axis can in particular be a longitudinal axis.

[0015] Advantageously, the second housing part can be clamped to the first housing part by means of a clamping device. Advantageously, by means of the clamping device, a driving force can be effected between the first housing part and the second housing part at least in axial direction. Advantageously, the clamping device can be releasable. Advantageously, the clamping device can comprise at least one clamping element, in particular at least one screw, at least one clamping hook and / or at least one catch and the like. Advantageously, the clamping device can engage directly at the second housing part. Alternatively or additionally, the clamping device can engage at the cyclone housing, wherein the second housing part is arranged between the cyclone housing and the first housing part.

[0016] Advantageously, the at least one cyclone separator, in particular the cyclone block with a plurality of cyclone separators, can comprise at least one dust discharge device.

[0017] Advantageously, the at least one cyclone separator can be an axial cyclone separator.

[0018] Advantageously, the filter device can comprise at least one cyclone block, which comprises a plurality of cyclone separators. In this way, a larger gas flow can be purified and the available construction space is optimally utilized.

[0019] Advantageously, the at least one inlet opening and the at least one outlet opening can be located at axially opposite sides of the filter housing with respect to the axis.

[0020] Advantageously, the at least one filter medium body can comprise at least one filter pleat, in particular at least one single-pleat and / or at least one double-pleat.

[0021] Advantageously, the filter medium body can comprise a filter medium, in particular a filter paper, a filter nonwoven, a filter foam and the like. This is suitable for filtering gaseous media, in particular air.

[0022] Advantageously, the filter medium of the at least one filter medium body can be folded or wound. In this way, the active filter surface area can be enlarged. The filter element can be correspondingly designed as a folded filter element or a wound element.

[0023] Advantageously, the at least one filter element can be a compact filter element, a hollow filter element, a flat filter element, etc.

[0024] Advantageously, the filter medium body can in particular comprise a sawtooth folded filter medium having deep pleats. In the case of an approximately cuboid or prismatic filter medium body, one speaks of deep pleats when the pleat height is at least as great as the extension in the direction of the pleat edge and / or in a direction transverse to the pleat edge.

[0025] The hollow filter element is characterized in that it comprises at least one element interior surrounded by filter medium.

[0026] The hollow filter element can advantageously be a so-called round filter element having a circular cross section; an oval filter element having an oval cross section; a flat oval filter element having a flat oval cross section; a conical filter element, wherein the circular cross section tapers in the axial direction with respect to the main axis; an elliptical conical filter element, wherein the oval cross section tapers in the axial direction at least in the direction of one transverse axis; a flat elliptical conical filter element, wherein the flat oval cross section tapers in the axial direction at least in the direction of one transverse axis; or a hollow filter element having different types of cross sections, in particular angular cross sections, and / or different types of axial cross-sectional course in the direction of the element axis.

[0027] Advantageously, the rib can be fixedly arranged at the second housing part, in particular arranged stationary with respect to pressure loads. In this way, the rib is displaced together with the second housing part when the first housing part and the second housing part are axially assembled with the at least one filter element inserted. This is not possible if the second housing part is part of the at least one filter element. In particular, the rib is displaced together with the second housing part by the clamping action of the clamping device when assembled.

[0028] The uncleaned side is the side on which the gaseous medium to be cleaned during operation of the filter device is located. The cleaned side refers to the side on which the cleaned gaseous medium is located.

[0029] In an advantageous embodiment, the rib can support a circumferential sealing section acting at least partially radially sealingly at the radially inner circumferential side of the sealing section, in particular at the radially inner circumferential side of the sealing section radially opposite the inner wall surface of the first housing part. In this way, the sealing section can be pressed against the inner wall surface of the first housing part in particular directly by means of the rib.

[0030] Advantageously, the contact pressure exerted by the rib can comprise at least one directional component which is oriented radially from inside to outside with respect to the axis. In this way, the corresponding sealing section can be pressed directly against the inner wall surface of the first housing part using a radial sealing force. Thus, the contact pressure exerted by the rib can directly generate a radial sealing force.

[0031] Alternatively or additionally, the contact pressure exerted by the rib can comprise at least one directional component which is oriented parallel to the axis. In this way, at least one sealing element can be compressed in the axial direction. The sealing material can yield radially outwardly in compression, whereby the pressure acts radially on the inner wall surface of the first housing part. Thus, the contact pressure exerted by the rib can indirectly generate a radial sealing force, in particular by deformation of the sealing element in the transverse direction.

[0032] Advantageously, at least one sealing section of the circumferential seal can be deformed in the filter housing in the case of installation of at least one filter element, compared to the case of non- installation of at least one filter element. Thus, the corresponding sealing section can be pressed flexibly against the inner wall surface of the first housing part.

[0033] In a further advantageous embodiment, the rib can contact the circumferential seal at an axial end face facing the second housing part in the axial direction with respect to the axis, wherein a directional component of the contact pressure acts in the axial direction with respect to the axis. In this way, the circumferential seal can be deformed by compression. Thus, the deformed sealing element, which acts partially radially, can be pressed against the inner wall surface of the housing.

[0034] Advantageously, the rib can contact the circumferential seal directly at the inflow-side end face in the axial direction, in order to achieve a deformation of the circumferential seal and, in this way, to press the circumferential sealing section, which acts partially radially, against the inner wall surface of the housing.

[0035] In a further advantageous embodiment, the rib can be embodied at least partially as a ramp and / or a contact surface of the rib facing the radially inner circumferential side of the circumferential sealing section, which acts at least partially radially, can be positioned at an acute angle to the axis. In this way, the rib can slide along the radially inner circumferential side of the sealing section and press it in turn against the inner wall surface of the first housing part when the first housing part and the second housing part are assembled axially. Due to the wedge action between the "angled" rib and the sealing section, a high radially acting sealing pretension can be achieved with the aid of a controllable axial installation force.

[0036] In a further advantageous embodiment, The circumferential sealing section, which at least partially acts in a radially sealing manner, can be at least partially offset radially outward relative to the axis from the outer wall surface of the filter media body. and / or The circumferential sealing section, which acts at least partially radially, can protrude at least partially axially beyond the inflow side of the filter media body.

[0037] According to another advantageous embodiment, The filter device may include a cyclone block having multiple cyclone separators, wherein the cyclone block includes an immersion tube sheet as a second housing portion of the filter housing, the immersion tube sheet including multiple immersion tubes and forming circumferential ribs at the immersion tube sheet. and / or The at least one inlet opening may be arranged at one or more portions of the at least one cyclone separator, particularly in the submerged tube of the at least one cyclone separator. and / or The second housing portion may include a cyclone block portion, which includes multiple cyclone separators. and / or The second housing portion may include an immersion tube sheet having at least one immersion tube with a cyclone separator. and / or The second housing portion may include multiple submersible tubes corresponding to the cyclone separator. and / or The second housing portion can be arranged between the first housing portion and the cyclone housing of the cyclone block to which the at least one cyclone separator belongs. In this way, the filter device can be designed in a compact configuration with at least one filter element and at least one cyclone block. By means of a cyclone block having multiple cyclone separators, effective pre-separation of particles from the gaseous medium to be purified can be achieved, and the structural size required for pre-separation can be minimized.

[0038] In another advantageous embodiment, Viewed axially along the axis, the axial end of the inflow side of the circumferential seal can protrude beyond the free end of the rib of the second housing portion. and / or Viewed axially in the direction of the axis, the rib may protrude beyond the free end of the circumferential seal, particularly at least one free end of the sealing segment. and / or The rib can be inserted into a recess in the circumferential seal, which opens on its side facing the inflow side relative to the axis. and / or The second housing portion may include at least one submerged tube of at least one cyclone separator, the submerged tube having an outflow end on its inflow side facing at least one filter element, the outflow end being at least partially surrounded by an edge section of the submerged tube, wherein, when the filter assembly is installed, the edge section of the submerged tube may be radially located within a sealing section, at a certain axial distance from the free end of the circumferential seal. In this way, axial overlap can be achieved between the seal and the second housing portion, particularly the ribs and / or the submerged tube.

[0039] Advantageously, when the filter device is installed, the edge section of the immersion tube can be located radially inside the sealing section, at a certain axial distance from the free end of the seal. Advantageously, viewed axially, the outlet end can be located outside the axial free end of the inflow side of the circumferential seal. Viewed axially, the edge section of the immersion tube at least partially surrounding the outlet end, and therefore the outlet end of at least one immersion tube, can be immersed behind the free end of the circumferential seal, thereby immersing behind the inflow side end of at least one filter element.

[0040] In another advantageous embodiment, the first housing portion may include at least a partially circumferentially extending radially projecting collar, which provides at least one axial contact surface on which at least one radially projecting support segment of the filter element is supported. In this way, a circumferential seal can be additionally supported axially relative to the axis at the first housing portion. Here, an additional sealing region can be achieved. In this additional sealing region, at least one circumferential seal can act sealingly in the axial direction.

[0041] Advantageously, the discharge collar of the first housing portion can extend continuously, particularly circumferentially, or it can be interrupted.

[0042] In another advantageous embodiment, the collar may include at least two axial contact surfaces, particularly four axial contact surfaces located at different axial heights. and / or The collar may include at least two collar segments, particularly four collar segments, and corresponding contact surfaces, each contact surface extending partially circumferentially around the axis. In this way, misassembly of the filter device can be prevented. Specifically, this method can prevent misorientation of at least one filter element, the first housing portion, and the second housing portion during assembly.

[0043] In another advantageous embodiment, the contact area of ​​the sealing section can be arranged at a certain axial distance from at least one axial contact surface of the collar, and the sealing section acts radially and sealingly against the inner wall surface of the first housing portion in this contact area. In this way, at least one area where the sealing section does not contact the inner wall surface can be achieved between the sealing section and the inner wall surface of the first housing portion.

[0044] In another advantageous embodiment, the first and second housing portions can form a sealing chamber in which a circumferential sealing section acting at least partially radially is accommodated. The sealing chamber is defined radially inward by ribs of the second housing portion, radially outward by the inner wall surface of the first housing portion, and axially by collars connected to the second housing portion, particularly by collars connected to other portions of the second housing portion. In this way, space can still be provided for accommodating the sealing section, even after deformation.

[0045] Advantageously, the collar can provide an axial sealing surface at which the circumferential seal acts sealingly in the axial direction. In this way, an outward sealing effect can be achieved, particularly a sealing effect against the environment.

[0046] Advantageously, the sealing chamber can be axially defined on the inflow side by a collar connected to the second housing portion, and in particular by a collar connected to another portion of the second housing portion.

[0047] In another advantageous embodiment, the circumferential seal may be defined by a frame element at its axial end opposite to the second housing portion. This frame element extends at least partially circumferentially about an axis and is connected to the filter media body. The frame element, in particular, has a surface that is at least partially exposed, and the exposed portion of the frame element may at least partially form a radially projecting support section of the filter element, which is supported at the axial support surface of a radially projecting collar of the first housing portion. In this way, the circumferential seal can be supported on its axially opposite side to the second housing portion. Furthermore, in this way, at least one support section can be stably connected to the filter media body, and a rigid form-fit contact of the filter element at the housing can be achieved.

[0048] Advantageously, the frame element may include or be constructed of a plastic material. In this way, the frame element can achieve strength, flexibility, and minimal weight. In this context, the term "plastic frame" may also be used for the frame element. Alternatively or additionally, the frame element may also advantageously include or be constructed of at least one other material, particularly metal, carbon fiber, or composite materials.

[0049] Advantageously, the frame element can be part of the skeleton of the filter element and / or can be connected to the skeleton of the filter element. The at least one filter media body can be held at the skeleton. By means of the skeleton, at least one filter element can be stabilized and its shape maintained. At least a portion of the skeleton can include or be made of plastic material, metal, carbon fiber, or composite material.

[0050] Advantageously, the skeleton, especially the skeleton with frame elements, can be realized as a single piece. In this way, the skeleton can be made particularly stable.

[0051] In some embodiments, the frame elements may also be configured as components separate from the skeleton.

[0052] In another advantageous embodiment, The frame element begins with at least one exposed section and may extend at least partially inward in the direction of the inflow side in an axial and / or radial direction. and / or The frame element may be embedded at least partially by the material of the circumferential seal.

[0053] Advantageously, the frame element can extend at least partially inward in the axial and / or radial direction in the direction of the inflow side. In this way, stabilization of at least one filter media body can be achieved. Furthermore, a portion of the frame element can be used in this way as a casting mold for the material used for the seal.

[0054] As an alternative or addition, advantageously, the frame element can be at least partially embedded in the material of the circumferential seal. In this way, the support of the seal can be improved.

[0055] In another advantageous embodiment, with at least one filter element of the filter device arranged in at least one filter element receiving space and the second housing portion released from the first housing portion, a radial gap may exist between the inner wall surface of the second housing portion and the radially outer circumferential side of the circumferential sealing section that at least partially acts radially. In this way, at least one filter element can be moved axially into or out of the filter element receiving space without friction between the radially sealing section and the inner wall surface of the second housing portion, thereby minimizing installation forces.

[0056] In another advantageous embodiment, The filter media body may include a cross-sectional shape comprising, in particular, at least two curved edges connected by two straight edges. and / or The filter media body may include a radially outer filter media section and a radially inner filter media section, each of which is circumferentially continuous with respect to an axis, wherein the radially inner filter media section is arranged within the radially outer filter media section. and / or The outer wall of the filter media body, particularly the outer wall of the radially outer filter media section, includes an elongated elliptical cross-section. and / or The inner wall of the filter media body, particularly the inner wall of the radially inner filter media section of the filter media body, includes an elongated elliptical cross-section. and / or Viewed from the inflow side along the axial direction, the outer wall of the filter media body, especially the outer wall of the radially outer filter media section, can taper, particularly in a tapered manner. and / or Viewed from the outflow side along the axial direction, the inner wall of the filter media body, particularly the radially inner section of the filter media body, can taper, especially in a conical manner. In this way, an improved ratio between space requirements and filter surface area can be achieved for the filter media.

[0057] Advantageously, the filter media section can be implemented as a corrugated section. In the case of a corrugated section, the filter media can be folded. In this way, the surface area of ​​the activated filter can be increased.

[0058] In another advantageous embodiment, At least one filter media section of the filter media body, particularly the radially outer filter media section of the filter media body, can flow radially from the inside to the outside. and / or At least one filter media section of the filter media body, particularly the radially inner filter media section, can allow radial flow from the outside to the inside. In this way, the ratio between the axial and radial expansion of the filter element can be increased. In this way, a filter element with an elongated configuration in the axial direction compared to radial expansion can be achieved.

[0059] In another advantageous embodiment, The at least one filter media body may include at least two filter corrugations, particularly an inner filter corrugation and an outer filter corrugation, and particularly at least two pleated filter corrugations. The filter corrugations extend at least partially around an axis and can be passed through in parallel by the gaseous medium to be purified. and / or At least one inner filter corrugation of a filter media body may be arranged inside the interior surrounded by at least one outer filter corrugation of a filter media body. and / or At least one filter media body may include at least one filter corrugation, particularly an inner filter corrugation and / or an outer filter corrugation that is inclined relative to the axis. By using multiple filter corrugations and their specific arrangement relative to each other, the overall ratio of space requirement to the surface area of ​​the active filter through which the flow passes can be improved.

[0060] In this context, "flowing in parallel" means that the filter corrugations are arranged to operate in parallel, particularly relative to the flow of the gaseous medium. This does not mean that the filter corrugations are geometrically parallel. The filter corrugations are passed through in parallel by the gaseous medium to be purified. Conversely, in a series arrangement of filter corrugations, they are passed through one after another, i.e., in series.

[0061] In another advantageous embodiment, the filter device may include at least one additional filter element, particularly a secondary filter element, fluidly arranged downstream of at least one filter element, particularly a primary filter element, and including a circumferential seal. In this way, the separation of particles from the gaseous medium to be purified can be further improved, and, alternatively or additionally, contaminants can be prevented from entering the clean side during servicing of the primary filter element.

[0062] Advantageously, at least one additional filter element, particularly a secondary filter element, can be spatially arranged in the filter element receiving space between the filter element having at least one circumferential seal and at least one outlet opening of the filter housing. In this way, the filter device can be constructed in a more compact configuration.

[0063] Furthermore, according to the invention, the filter element achieves this objective by comprising: at least one filter element including a seal extending circumferentially around a virtual axis at an inflow side that can be arranged to face the second housing portion; the seal including a sealing section that acts in a at least partially radially sealing manner relative to the axis and extends circumferentially around the axis, wherein, relative to the axis, the radially outer circumferential side of the sealing section can make tight sealing contact with the axis at an inner wall surface radially inward of the first housing portion. Contact pressure can be applied to the circumferential seal by means of ribs that extend at least partially around the axis circumferentially and protrude from the second housing portion in the axial direction with at least one directional component, so as to press the circumferential sealing segment, which can at least partially act radially in a sealing manner, against the inner wall surface of the first housing portion.

[0064] Furthermore, according to the invention, the purpose is achieved by the following: the filter element includes a circumferential seal on the inflow side of the second housing portion facing the filter device, the circumferential seal including a circumferential sealing section that acts at least partially radially sealingly relative to a virtual axis, the circumferential sealing section tightly sealingly abutting the radially inner inner wall surface of the first housing portion relative to the axis on a radially outer circumferential side, wherein at least a portion of the circumferential ribs protruding in the axial direction away from the second housing portion by at least one directional component applies contact pressure to the circumferential seal to press the at least partially radially sealing circumferential seal against the inner wall surface of the first housing portion.

[0065] Furthermore, according to the invention, the method achieves this objective by: a seal extending circumferentially around a virtual axis at the inflow side of at least one filter element facing the second housing portion pressing against the radially inner wall surface of the first housing portion relative to the axis in a manner that acts in a manner that is at least partially radially sealing, the rib extending circumferentially around the axis and protruding from the second housing portion in at least one directional component in the axial direction relative to the axis.

[0066] According to the present invention, at least one filter element is simply inserted into the filter housing without any force effect.

[0067] Advantageously, the installation of the filter element in the filter element receiving space of the first housing portion and the attachment of the second housing portion to the first housing portion can be performed in an axial direction relative to the axis.

[0068] Advantageously, the clamping action of the circumferential seal can be achieved by means of a clamping device engaged between the first housing portion and the second housing portion.

[0069] Advantageously, filter elements for gaseous media in filter devices, particularly air filter elements, may include - At least one filter media body, having an inflow side and an outflow side respectively located at axial ends of the filter media body that are opposite to each other relative to a virtual axis. - and a frame element extending at least partially around the at least one filter media body in a circumferential direction, the frame element projecting radially beyond the filter media body relative to an axis and connected to the at least one filter media body, -Among them, a seal extending circumferentially around the axis is present on the inflow-facing side of the frame element. -In addition, at least one support section is provided on the outflow side of the frame element, by means of which the filter element can be supported in the filter housing of the filter device at least in the axial direction relative to the axis.

[0070] Advantageously, in the filter element, at least one support segment may include at least two support surfaces extending around a surrounding axis, the support surfaces being spaced apart from each other in the axial direction relative to the axis, and the circumferential seal may include a circumferential sealing strut projecting in the axial direction relative to the axis and configured to at least partially seal radially relative to the axis with respect to a corresponding sealing surface of the filter housing.

[0071] Advantageously, the support section may include at least two, particularly four, support surfaces distributed around the circumference, each spaced apart from the other relative to the axial direction. In this way, by means of support surfaces at different axial heights, incorrect installation of the filter element in the filter housing can be prevented.

[0072] Advantageously, the sealing strut can protrude axially beyond the inflow side of at least one filter media body relative to the axis. In this way, the inflow side of the filter media body can be arranged radially relative to the axis inside the circumferential sealing strut.

[0073] Advantageously, the sealing strut can be arranged directly adjacent to the radial outer wall surface of the frame element relative to the axis, and / or the sealing strut can be arranged radially relative to the axis on the outside of the radial outer wall surface of at least one filter media body.

[0074] Advantageously, the sealing strut can be arranged directly adjacent to the radial outer wall surface of the frame element. In this way, the sealing strut can be supported by the frame element in the axial direction relative to the axis.

[0075] Alternatively or additionally, the sealing strut can advantageously be arranged entirely radially on the outer side of the radial outer wall surface of at least one filter media body. In this way, the sealing strut and at least one filter media body can be better separated relative to the contact pressure used to achieve the sealing effect.

[0076] Advantageously, the frame element can be made less flexible than the circumferential seal, in particular the frame element can be formed of a material that is harder than the circumferential seal and / or the seal can include or be made of an elastic material, in particular an elastomer, especially a foam elastomer, and / or the frame element can include or be made of a plastic material, in particular an injection-moldable rigid plastic material.

[0077] Advantageously, the frame element can be made less flexible than the circumferential seal. In this way, the supporting function can be achieved by means of the frame element and better deformability can be achieved by means of the seal. In this case, different levels of flexibility can be achieved by means of different materials and / or by means of different shapes.

[0078] Advantageously, the frame element can be formed from a material that is harder than the circumferential seal. In this way, the frame element can be formed to be less flexible than the seal. The material can be a single material or a mixture of materials, particularly a composite material.

[0079] As an alternative or addition, the frame element can be made at least partially of the same material as the seal, particularly the sealing material. In this way, the connection between the frame element and the seal can be improved.

[0080] As an alternative or addition, the frame elements and seals can be implemented as multi-component parts, particularly two-component parts. In this way, manufacturing can be simplified.

[0081] Advantageously, seals and frame components can be produced by multi-component injection molding methods, especially two-component injection molding methods.

[0082] As an alternative or addition, the seal may include or be advantageously made of an elastic material. In this way, the seal can be deformed. An elastic seal can simply be made of an elastomer, particularly a foam elastomer.

[0083] As an alternative or addition, the frame element may include or be made of plastic material. In this way, a stable and lightweight frame element can be achieved. A rigid and robust frame element can be easily achieved by injection molding from an injection-moldable rigid plastic material. Complex shapes of the frame element can also be achieved using injection molding.

[0084] Advantageously, the circumferential seal may be defined by a frame element on the outflow-facing side, and / or the outflow-facing surface of the frame element may be at least partially exposed, providing at least one support section. Due to the definition by the frame element, the circumferential seal can be supported on the outflow-facing side of the frame element. In the exposed section, the surface of the frame element can contact the corresponding portion of the filter housing without the need for sealing material to be inserted.

[0085] Advantageously, the frame element may extend radially inward and / or toward the inflow side from the support section, and / or the frame element may be at least partially embedded in the material of the circumferential seal.

[0086] Advantageously, the frame element can extend radially inward and / or toward the inflow side from the support section. In this way, stabilization of at least one filter media body can be achieved. Furthermore, in this way, a portion of the frame element can serve as a casting mold for the material of the seal.

[0087] As an alternative or addition, the frame element can be advantageously embedded, at least partially, into the material of the circumferential seal. In this way, the support provided to the seal can be improved.

[0088] Advantageously, the frame element can exhibit non-rotational symmetry relative to its axis, at least at its radially outer wall surface and / or its radially inner wall surface. In this way, incorrect installation, especially misalignment, of the filter element when it is installed into the filter housing can be prevented.

[0089] Advantageously, the frame element may have at least four segments along its circumferential direction around the axis, wherein corresponding adjacent segments have different curvatures, or even straight curvatures, and in the case of at least one pair of corresponding segments on opposite sides of the axis, the corresponding segments have different curvatures. And / or the circumferential sealing strut protruding in the axial direction may include at least four segments along its circumferential direction around the axis, wherein corresponding adjacent segments have different curvatures, or even straight curvatures, and in the case of at least one pair of corresponding segments on opposite sides of the axis, the corresponding segments have different curvatures. In this way, rotational symmetry of the frame element and / or sealing strut relative to the axis can be avoided. In this way, incorrect installation of the filter element in the filter housing can be prevented.

[0090] Advantageously, the frame element may include at least two curved sections bent relative to its circumferential orientation about an axis, connected by two connecting sections, particularly two straight connecting sections that are straight relative to their circumferential orientation about an axis, wherein the connecting sections, particularly the straight connecting sections, are located on the long side of the frame element, which is opposite to each other relative to the axis, and the two curved sections are located on the short side of the frame element, which is opposite to each other relative to the axis. And / or the circumferential sealing strut projecting in the axial direction includes at least two curved sections bent relative to its circumferential orientation about an axis, connected by two connecting sections, particularly two straight connecting sections that are straight relative to their circumferential orientation about an axis, wherein the connecting sections, particularly the straight connecting sections, are located on the long side of the sealing strut, which is opposite to each other relative to the axis, and the two curved sections are located on the short side of the sealing strut, which is opposite to each other relative to the axis. In this way, rotational symmetry of the frame element and / or the sealing strut relative to the axis can be avoided. In this way, incorrect installation of the filter element in the filter housing can be prevented.

[0091] Advantageously, the frame element may include a first curved section and a second curved section, wherein the first curved section at least partially includes a larger radius of curvature than the second curved section, and / or the circumferential sealing strut projecting in the axial direction may include a first curved section and a second curved section, wherein the first curved section at least partially includes a larger radius of curvature than the second curved section. Due to the different curvatures of the curved sections, combined with the different lengths of the connecting sections and the curved sections, rotational symmetry relative to the axis can be avoided.

[0092] Advantageously, the first curved section of the frame element may include a gentle region in which the radius of curvature decreases relative to the radius of curvature of the second curved section, and / or the first curved section of the sealing strut may include a gentle region in which the radius of curvature decreases relative to the radius of curvature of the second curved section. In this way, different radii of curvature can be easily achieved.

[0093] Advantageously, at least one of the supporting surfaces of the frame element may exist at least in the region of the long side of the frame element. In this way, a large surface area of ​​support can be achieved.

[0094] Advantageously, the radial outer wall surface of the filter media body may include at least two curved segments that are curved relative to the axis in a circumferential direction about the axis, said at least two curved segments being connected by two connecting segments, particularly two straight connecting segments, and / or the outer circumference of the filter media decreases when viewed axially from the inflow side to the outflow side. In particular, when viewed axially from the inflow side to the outflow side, the filter media body may taper, particularly tapering, relative to its radial outer side.

[0095] Due to the combination of at least two curved sections and connecting sections, an elliptical shape can be achieved when viewed in the axial direction. Advantageously, the two connecting sections can be straight. In this way, an elongated elliptical shape can be achieved for the filter media body.

[0096] Viewed from the inflow side to the outflow side, the space surrounding the filter medium body inside the filter housing can be expanded due to the reduction in the outer circumference.

[0097] Advantageously, the filter media body can flow radially from the inside to the outside or in the opposite direction relative to the axis. In this way, the ratio between the required installation space and the available activated filter surface area of ​​the filter media body can be increased, thereby benefiting the activated filter surface.

[0098] Advantageously, the at least one filter media body may include at least two filter corrugations, particularly an inner filter corrugation and an outer filter corrugation, particularly at least two folded filter corrugations extending at least partially around an axis, and can be through which the gaseous medium to be purified flows in parallel, and / or the inner filter corrugation of the at least one filter media body may be arranged inside the outer filter corrugation surrounded by the at least one filter media body, and / or the at least one filter media body may include at least one filter corrugation, particularly an inner filter corrugation and / or an outer filter corrugation inclined relative to an axis. By using multiple filter corrugations and their specific arrangement relative to each other, the overall ratio of the required space to the surface area of ​​the active filter to be flowed through can be increased.

[0099] In this context, "flowing in parallel" means that the filter corrugations are arranged to operate in parallel, particularly relative to the flow of the gaseous medium. This does not mean that the filter corrugations are geometrically parallel. The filter corrugations are passed through in parallel by the gaseous medium to be purified. Conversely, in a series arrangement of filter corrugations, they are passed through one after another, i.e., in series.

[0100] Advantageously, with respect to the axis, at least one fluid-permeable support element may exist radially between at least two filter corrugations, particularly between the inner and outer filter corrugations, wherein at least one of the at least two filter corrugations, particularly the inner and / or outer filter corrugations, is at least partially supported at this support element, and / or the filter element includes at least one support element at which at least one of the filter corrugations is supported, wherein the at least one support element may be formed as a single piece together with the frame element. The shape stability of the filter media body can be improved by means of the support element. In this case, fluid permeability makes it possible for the flow of gaseous media to be unimpeded.

[0101] Advantageously, the filter element may include at least one support element at which at least one of the filter corrugations is supported, wherein the at least one support element may be formed as a single piece together with the frame element. In this way, mechanical stability can be further improved.

[0102] Advantageously, the support elements and / or frame elements can be part of the skeleton. With the help of the skeleton, the overall shape of the filter element can be stabilized.

[0103] Advantageously, filter devices for gaseous media, particularly air, may include - A filter housing having at least one inlet opening for the gaseous medium to be purified and at least one outlet opening for the gaseous medium to be purified. - wherein at least one filter element, comprising at least one filter media body, is arranged in a filter housing relative to the airflow between at least one inlet opening and at least one outlet opening, such that at least one filter media body separates the unpurified side associated with the inlet opening from the clean side associated with the outlet opening. The filter housing includes a first housing portion, the at least one outlet opening is disposed in the first housing portion, and the first housing portion includes at least one filter element receiving space, in which at least one filter element is disposed. -And wherein the filter housing includes a second housing portion, the at least one inlet opening is disposed at the second housing portion, and the second housing portion includes at least a portion of a cyclone separator. - wherein the second housing portion closes the maintenance opening of the first housing portion, and the first and second housing portions are releasably connected to and separable from each other so that at least one filter element can be removed through the maintenance opening of the first housing portion.

[0104] Advantageously, at least one of the filter elements can be a filter element according to the invention.

[0105] Advantageously, a filter element comprising at least one filter media body can be used in a filter device for gaseous media. Advantageously, the filter element can be a filter element according to the invention.

[0106] Advantageously, in the method for assembling a filter device for a gaseous medium, at least one filter element can be introduced through a maintenance opening into a filter element receiving space of a first housing portion of the filter housing of the filter device, the first housing portion including at least one outlet opening for the gaseous medium to be purified, and subsequently the maintenance opening can be closed by a second housing portion of the filter housing, the second housing portion including at least one inlet opening for the gaseous medium to be purified and at least a portion of at least one cyclone separator. Advantageously, at least one filter element according to the invention can be introduced into the filter element receiving space.

[0107] In other respects, the features and advantages disclosed in combination with the filter device according to the invention, the filter element according to the invention, the use according to the invention, and the method according to the invention, and their respective advantageous embodiments, apply to each other, and vice versa. Of course, the various features and advantages can be combined with each other, whereby further advantageous effects beyond the sum of the individual effects may be produced. Attached Figure Description

[0108] Other advantages, features, and details of the invention are derived from the following description, wherein embodiments of the invention will be explained in more detail with the aid of the accompanying drawings. Those skilled in the art will readily consider, in combination with, the features disclosed in the drawings, description, and claims, and combine them for further facilitating combinations. It is illustratively shown that: Figure 1 An isometric view of a filter device with cyclone blocks for gaseous media, viewed from the side of the outlet socket; Figure 2 This shows the view from the inflow side of the main filter element of the filter unit. Figure 1 An isometric diagram of the filter device, without cyclone blocks; Figure 3 Show Figure 1 and Figure 2 Exploded view of the filter device; Figure 4 Show Figures 1 to 3 Detailed view of the cyclone block of the filter device in the circumferential rib region; Figure 5 Show Figures 1 to 3 Detailed view of the main filter element of the filter unit in the circumferential sealing area; Figure 6 Showing through Figures 1 to 3 The longitudinal section of the filter device; Figure 7 Show Figure 6 A detailed view of the longitudinal section of the filter assembly in the circumferential sealing area of ​​the main filter element; Figure 8 Showing through Figures 1 to 3 The longitudinal section of the filter device, without the cyclone shell of the cyclone block; Figure 9 Show Figure 8 A detailed view of the longitudinal section of the filter assembly in the circumferential sealing area of ​​the main filter element; Figure 10 Showing through Figures 1 to 3 The longitudinal section of the filter device, without cyclone blocks; Figure 11 Show Figure 10 A detailed view of the longitudinal section of the filter assembly in the circumferential sealing area of ​​the main filter element; Figure 12 Showing the view from the maintenance opening Figure 1 and Figure 3 An isometric view of the housing tank of the filter device, wherein the post-filter elements are arranged in the housing tank; Figure 13 Showing the view from the axial direction of the maintenance opening. Figure 12A diagram of the shell tank; Figure 14 Showing through Figure 12 and 13 The longitudinal section of the shell tank has along Figure 13 The cross-sectional line XIV-XIV of the post-filter element; Figure 15 Show Figure 14 Detailed view of the longitudinal section in the collar region of the shell tank surrounding the maintenance opening; Figure 16 This shows the view from the inflow side of the main filter element. Figures 1 to 3 An isometric view of the skeleton of the main filter element of the filter device; Figure 17 This shows the view from the outflow side of the main filter element. Figure 16 An isometric view of the skeleton; Figure 18 Show Figure 16 and 17 Side view of the short side of the skeleton; Figure 19 Show Figures 16 to 18 A side view of the long side of the skeleton; Figure 20 Shown from the direction of outflow. Figures 1 to 3 An isometric view of the main filter element of the filter device; Figure 21 Showing the view from the inflow side Figures 1 to 3 An isometric view of the main filter element of the filter device; Figure 22 Show Figures 1 to 3 A side view of the long side of the main filter element of the filter device; Figure 23 Show Figures 1 to 3 A side view of the short side of the main filter element of the filter device.

[0109] In the figure, the same components are marked with the same reference numerals. Detailed Implementation

[0110] exist Figures 1 to 23 In the illustrations, a filter device 10 and its components for a gaseous medium are shown in different figures. A gaseous medium, such as air, can have solid particles, such as dust, removed by means of the filter device 10.

[0111] The filter device 10 can be used in vehicles (e.g., motor vehicles), construction and / or agricultural machinery, compressors connected to internal combustion engines, cathode filters such as those connected to fuel cells, etc.

[0112] For example, such as Figure 3As shown in the exploded view, the filter assembly 10 includes a housing tank 12, a post-filter element 14, a main filter element 16, an immersion tube sheet 18, and a cyclone housing 20. The filter assembly 10 is generally axially configured relative to axis 22.

[0113] The components of the filter assembly 10 and their arrangement relative to each other with respect to the virtual axis 22 will be explained below. Axis 22 may coincide with the housing axis of the housing tank 12, the corresponding installation / removal axes of the post-filter element 14 and main filter element 16 within and from the housing tank 12, the connection axis of the submerged tube sheet 18 to the housing tank 12, the connection axis of the cyclone housing 20 to the housing tank 12, the element axis of the post-filter element 14, the element axis of the main filter element 16, the housing axis of the housing tank 12, the plate axis of the submerged tube sheet 18, and the housing axis of the cyclone housing 20. When the description refers to “radial,” “coaxial,” “axial,” “tangential,” “circumferential,” “concentric,” “eccentric,” etc., unless otherwise specified, this refers to axis 22. In the following text, “circumferential” refers to the orientation of the corresponding virtual wall surface around axis 22.

[0114] In the connected state, the immersion tube sheet 18 and the cyclone housing 20 form a cyclone block 24. On the other hand, the housing tank 12, which is the first housing part, and the immersion tube sheet 18, which is the second housing part, form a filter housing 26 in the connected state. When assembling the filter device 10, the immersion tube sheet 18 is connected to the cyclone housing 20 by means of screws.

[0115] In the following text, we will use Figure 3 and Figures 12 to 15 A more detailed explanation of shell tank 12.

[0116] The shell container 12 is implemented as a single piece. The shell container 12 is made of, for example, a plastic material, such as a rigid plastic material.

[0117] The housing 12 includes a housing wall 30 that continuously surrounds an axis 22. At the axial end face of the housing 12, the housing bottom 32 is adjacent to the housing wall 30. On the side axially away from the housing bottom 32, the housing wall 30 surrounds a maintenance opening 34.

[0118] The housing wall 30 and the housing bottom 32 define the filter element receiving space 36 of the housing tank 12. When the filter assembly 10 is installed, the rear filter element 14 and the main filter element 16 are arranged in the filter element receiving space 36. In this case, the rear filter element 14 and the main filter element 16 can be inserted into the filter element receiving space 36 and removed through the maintenance opening 34.

[0119] The outlet socket 38 is integrated into the bottom 32 of the housing. The outlet socket 38 includes an outlet opening 40 for purifying the gaseous medium. The outlet socket 38 extends axially, for example, relative to axis 22. For example, the outlet socket 38 has a cylindrical shape.

[0120] In the region axially adjacent to the bottom 32 of the housing, on the side facing the maintenance opening 34, the housing wall 30 extends radially outward in a stepped manner twice. Therefore, overall, the housing tank 12 tapers towards the bottom 32 in the axial direction. The stepped region forms a receiving area for the rear filter element 14. The area of ​​the filter element receiving space 36 between the stepped region and the maintenance opening 34 is used to receive the main filter element 16.

[0121] Viewed perpendicular to axis 22, the shell wall 30 has a slender elliptical cross-section.

[0122] On the axial side having the maintenance opening 34, the housing wall 30 includes a collar 42 that continuously surrounds the axis 22.

[0123] Viewed in the axial direction, collar 42 has an elongated elliptical cross-section. However, the elongated elliptical cross-section of collar 42 differs from that of the shell wall 30 between collar 42 and the shell bottom 32. The shell wall 30 is symmetrical about axis 22 with respect to axis 22 when rotated 180° relative to axis 22 in the region between the shell bottom 32 and collar 42. In contrast, collar wall 44 does not exhibit rotational symmetry with respect to axis 22. This will be explained in more detail below.

[0124] The collar wall 44 is radially offset outward relative to the main wall section 46 of the housing wall 30. The main wall section 46 extends axially between the collar 42 and the bottom of the housing 32.

[0125] The collar 48 extends between the main wall section 46 and the collar wall 44.

[0126] The collar 48 includes a plurality of contact surfaces 50 on its inner side facing the filter element receiving space 36 in an axial orientation. The contact surfaces 50 are arranged circumferentially along the collar 48 in corresponding collar sections of the collar 42. For ease of distinction, the contact surfaces 50 may be designated A, B, C, or D in the following reference numerals, i.e., 50. A 50 B 50 C Or 50 D .

[0127] The ramp surface 52 is arranged on the contact surface 50 A and contact surface 50 D Between. An additional ramp surface 52 is arranged on the contact surface 50. C and contact surface 50D The two sloping surfaces 52 are arranged on the radially opposite sides.

[0128] The contact surface 50 extends circumferentially and is perpendicular to the axis 22. The ramp surface 52 extends circumferentially and, when viewed from the maintenance opening 34, is inclined axially toward the axis 22 relative to the axis 22.

[0129] The sloping surface 52 of the collar 42 extends along the long side 54 of the filter device 10, and when viewed in the axial direction, the filter device 10 is arranged in an elongated elliptical shape. The short sides 56 extend between the long sides 54.

[0130] In the following text, the reference numerals for the long side 54 and the short side 56 are used to improve the clarity of the components of the filter device 10 having an elongated elliptical cross-section.

[0131] A gently curved segment 58 extends at one of the short sides 56 of the collar wall 44. A circularly curved segment 60 of the collar wall 44 extends at the short side 56 opposite to the axis 22. The gently curved segment 58 has a larger radius of curvature than the circularly curved segment 60. Between the gently curved segment 58 and the circularly curved segment 60, straight connecting segments 62 of the collar wall 44 extend along the long side 54, respectively.

[0132] In the area of ​​the gently curved section 58, three contact surfaces 50 are provided. A 50 B and 50 C Fourth contact surface 50 D Located on the side of the circular curved section 60. Two transverse contact surfaces 50 A and 50 C Each section extends from the transition portion of the corresponding straight connection segment 62 to the gently curved segment 58, and then to the third contact surface 50. B Third contact surface 50 B 50 on the transverse contact surface A and 50 C Extending between.

[0133] The intermediate contact surface 50 on the gently curved section 58 B The contact surface 50 on the portion of the circular curved section 60 D Located at the same axial height. The contact surface 50 on the gently curved section 58. A 50 B and 50 C Located at different axial levels, such as Figure 14 and 15 As seen. Viewed in the axial direction, the intermediate contact surface is 50... Band contact surface 50 D 50 compared to the two external contact surfaces A and 50 C Closer to the free edge of the collar wall 44. At the contact surface 50 D and contact surface 50 A The axial distance between them is 64, which is less than the distance at the contact surface of 50. D and contact surface 50 C The distance between them is 66.

[0134] like Figure 13 As observed, the contact surface is 50 D The circumferential extension, for example, extends circumferentially at an angle of approximately 90° around the center of the circular curved section 60 (not shown) at the center of the circular curved section 60.

[0135] At the contact surface 50 D A recess 68 exists between each of the adjacent ramp surfaces 52. The recesses 68 extend along the collar wall 44 in the axial and radial directions, respectively. The ramp surfaces 52 extend along the collar wall 44 from the corresponding straight connection section 62 to the corresponding circular bend section 60.

[0136] In the main wall section 46 of the housing wall 30, a plurality of grooves 70 extend approximately axially from the collar 48 to a position before the stepped region of the housing wall 30. The grooves 70 are distributed circumferentially along the main wall section 46. Each groove 70 is realized as a radially outward protrusion in the main wall section 46. Each of the grooves 70 forms an elongated recess on the radially inner side of the main wall section 46. Furthermore, each of the grooves 70 forms an elongated protrusion on the radially outer side of the main wall section 46. Depending on their circumferential position, the grooves 70 open toward the contact surface 50 or the ramp surface 52. Viewed in the axial direction, the cross-sections of the grooves 70 taper toward the bottom 32 of the housing.

[0137] Furthermore, a total of eight fastening blocks 72 are arranged radially outward on the main wall section 46. In this case, four of the fastening blocks 72 are located on the axially facing side of the main wall section 46 towards the collar 42. Another four of the fastening blocks 72 are located on the axially facing side of the stepped region adjacent to the bottom 32 of the housing. At each of the fastening blocks 72, a screw collar 74 is arranged on the side facing the corresponding long side 54. For example, the screw collar 74 is implemented as a flat metal plate. The screw collars 74 located on the common long side 54 extend in a plane. Each of the screw collars 74 includes a threaded hole. The axes of the threaded holes of the screw collars 74 extend parallel to each other. By means of the screw collars 74, the filter device 10 can be fastened to the corresponding retaining element. For example, the retaining element can be fixedly connected to the machine to which the filter device 10 is to be used.

[0138] Furthermore, a total of four clamping noses 76 are arranged on the outer side of the collar 48, axially away from the collar wall 44. The clamping noses 76 protrude away from the collar wall 44 in its axial extension. Two of the clamping noses 76 are located in the region near the transition from the gentle curve section 58 to the corresponding adjacent straight connecting section 62. The other two clamping noses 76 are located in the region near the transition from the rounded curve section 60 to the corresponding adjacent straight connecting section 62. Viewed in the axial direction, the clamping noses 76 are aligned with the axially adjacent fastening blocks 72. The clamping noses 76 are for engagement by corresponding clamping clips 78. As will be explained in more detail below, the clamping clips 78 are supported at the cyclone housing 20.

[0139] Between the free edges of the collar 48 and the collar wall 44, the collar wall 44 includes an inner wall surface 86 extending in the circumferential direction on its radially inner circumferential side. The inner wall surface 86 includes a ramp section 80 on its axially facing side toward the free edge of the collar wall 44. In the ramp section 80, the inner wall surface 86 extends obliquely relative to the axis 22. The radially inner circumference of the collar wall 44 expands axially toward the free edge in the ramp section 80. Therefore, the ramp section 80 forms a funnel-shaped insertion aid for the rear filter element 14 and the main filter element 16. The inner wall surface 86 extends axially parallel to the axis 22 between the ramp section 80 and the collar 48.

[0140] Furthermore, the collar wall 44 includes four recesses 82, and they are distributed along the free edge of the collar wall 44, for example in Figure 12 and 13 As can be seen, the recesses 82 deepen in the axial direction into the slope section 80 and extend in the circumferential and radial directions. Two of the recesses 82 are located at one of the long sides 54 of the corresponding transition between the connecting section 62 and the gently curved section 58. The other two recesses 82 are located at the long sides 54 of the transition between the corresponding connecting section 62 and the circularly curved section 60.

[0141] Two connectors 84 are also arranged on the outer side of the bottom 32 of the housing, axially away from the filter element receiving space 36. The connectors extend parallel to the axis 22. The connectors 84 are located on the radially opposite sides of the axis 22 adjacent to the short side 56 of the housing tank 12.

[0142] The post-filter element 14 is designed, for example, as a so-called flat filter element. The post-filter element 14 serves as a secondary filter element. Viewed in the direction of axis 22, the radially outer side of the post-filter element 14 has an elongated elliptical shape. In the two-stage stepped region adjacent to the bottom of the housing 32, the orientation of the radially outer wall surface of the post-filter element 14 corresponds to the elongated elliptical shape of the radially inner circumferential side of the housing tank 12. The post-filter element 14 has a seal 88 extending circumferentially relative to axis 22 at one of its axial end faces. By means of the seal 88, the clean side of the post-filter element 14 is separated from the unpurified side in the installed state.

[0143] In the following text, special reference will be made. Figure 3 , 5 The main filter element 16 is explained in more detail in sections 16 to 23.

[0144] The main filter element 16 includes a filter media body 90, a frame 92, an end member 94, and a seal 96.

[0145] Skeleton 92 in Figures 16 to 19 The details are shown below. The skeleton 92 is implemented as a single piece. For example, the skeleton 92 is manufactured as an injection-molded part of a rigid plastic material.

[0146] The skeleton 92 includes a central element 98 and a frame element 100.

[0147] The central element 98 serves as a support element, supporting the filter corrugations 134 and 136, which will be explained in more detail below. The central element 98 includes a plurality of axial struts 102. Each axial strut 102 extends approximately parallel to axis 22. The axial struts 102 are distributed around axis 22. The ends of the axial struts 102 located on the axial side of the frame 92 are connected to each other by connecting rings 104.

[0148] Viewed axially, the axial struts 102 have an approximately rectangular cross-section. The long side of the rectangular cross-section of each axial strut 102 is aligned radially parallel to the axis 22. The circumferential dimension of the axial strut 102 relative to the axis 22 (i.e., the extension of the short side of the rectangular cross-section of the axial strut 102) is constant along its axial length. Viewed axially, the radial dimension of the axial strut 102 relative to the axis 22 (i.e., the extension of the long side of the rectangular cross-section of the axial strut 102) increases from the end facing the connecting ring 104. Overall, viewed circumferentially, the axial struts 102 are designed to be approximately wedge-shaped relative to the axis 22.

[0149] Viewed from frame element 100 toward connecting ring 104, axial strut 102 is inclined radially outward relative to axis 22. Therefore, the virtual radial outer wall surface surrounding central element 98 and defined by the radial outer side of axial strut 102 comprises a conical shape tapering toward connecting ring 104. When viewed axially, the virtual radial inner wall surface defined by axial strut 102 comprises a shape tapering from connecting ring 104 toward frame 100.

[0150] Viewed in the axial direction, the connecting ring 104 has an elongated elliptical cross-section. The connecting ring 104 includes two parallel, coaxial ring segments of the same circumference, which are connected to each other by axially extending struts.

[0151] The end of the axial strut 102 that is axially opposite to the connecting ring 104 is connected to the radial inner ring 106. The radial inner ring 106 extends parallel to the connecting ring 104 on one hand and coaxially with the connecting ring 104 on the other hand. The radial inner ring 106 extends between the radially inner circumferential sides of the end of the axial strut 102.

[0152] An intermediate ring 108 is disposed between the radial inner ring 106 and the connecting ring 104. The intermediate ring 108 connects the axial struts 102 to each other. The intermediate ring 108 extends parallel to the connecting ring 104 and the radial inner ring 106 on one hand and coaxially with the connecting ring 104 and the radial inner ring 106 on the other hand. The intermediate ring 108 extends radially from the radial inner circumferential side of the axial strut 102 to the radial outer circumferential side. The intermediate ring 108 is positioned at a certain axial distance from the radial inner ring 106, which corresponds to approximately one-third of the axial distance between the radial inner ring 106 and the connecting ring 104.

[0153] Two connecting arcs 110 extend at short sides 56. Each of the connecting arcs 110 connects to the connecting ring 104 at its free end. At the center of the bend, each of the connecting arcs 110 connects to the central axial strut 102. Each of the connecting arcs 110 extends from the connecting ring 104 in an inclined manner relative to axis 22 at its axially facing side towards the frame element 100 in a direction toward the central axial strut 102. At each short side 56, one of the connecting arcs 110 connects to the central axial strut 102 at an axial distance relative to the connecting ring 104, which is approximately one-fifth of the axial distance between the frame element 100 and the connecting ring 104. This connecting arc 110 connects the connecting ring 104 to the central axial strut 102. The other connecting arc 110 at short side 56 connects to the central axial strut 102 at an axial distance relative to the connecting ring 104, which corresponds to approximately one-quarter of the axial distance between the frame element 100 and the connecting ring 104. The next connecting arc 110 connects the connecting ring 104 to the central axial strut 102, and connects the connecting ring 104 to the two adjacent axial struts of the central axial strut 102 at the short side 56.

[0154] The axial strut 102 includes a radially outer step at its wide end in the radial direction, which rises in the axial direction. The step of the axial strut 102 is connected to the outer ring 112.

[0155] The outer radial ring 112 has an elongated elliptical cross-section. The outer radial ring 112 extends coaxially with axis 22. The outer radial ring 112 is axially spaced from the inner radial ring 106. This is achieved through steps.

[0156] At the end of the axial strut 102, a corresponding connecting opening 114 is formed between the outer ring 112 and the radial inner ring 106. The connecting opening 114 includes the axial height of the step at the end of the axial strut 102. By means of the connecting opening 114, the axially extending flow space 140 located between two adjacent axial struts 102 is connected to each other at the level of the radial inner ring 106.

[0157] The radial outer ring 112 is surrounded by the support ring 116 of the frame element 100. The support ring 116 extends coaxially with the axis 22. As will be explained in more detail below, the support ring 116 has an elongated elliptical cross-section, which is different from the elongated elliptical cross-section of the radial outer ring 112, the radial inner ring 106, and the connecting ring 104.

[0158] The support ring 116 is connected to the radial outer ring 112 by means of radially extending radial struts 118. The radial struts 118 are bent at approximately 90° on their sides facing the support ring 16 in the direction toward the connecting ring 104. The bent ends of the radial struts 118 are respectively engaged on the axial sides of the support ring 116 away from the connecting ring 104.

[0159] The support ring 116 includes four support segments 120, for example... Figures 17 to 19 As shown. For better distinction, the reference numerals for the support section 120 are labeled A, B, C, and D.

[0160] Each axially facing side of the support segment 120 towards the connecting ring 104 forms a support surface 122. The reference numerals for the support surfaces 122 are similar to those for the corresponding support segments 120, and are labeled A, B, C, and D for better differentiation. Each support surface 122 is a plane. The planes of the support surfaces 122 extend perpendicularly to the axis 22.

[0161] Overall, the frame element 100 extends radially inward from the support section 120 and in the direction toward the inflow side 226 of the main filter element 16.

[0162] The cross-section of the outer radial side of the support ring 116 corresponds in shape to the cross-section of the inner radial side of the collar wall 44 of the shell tank 12. The outer radial circumference of the support ring 116 is slightly smaller than the inner radial circumference of the collar wall 44.

[0163] The support ring 116 includes a gently curved section 124 and a circularly curved section 126 on its radially outer wall surface. The gently curved section 124 and the circularly curved section 126 are connected to each other by two opposing straight connecting sections 128. The radius of curvature of the gently curved section 124 is larger than that of the circularly curved section 126. Therefore, overall, the support ring 116 and the radially outer wall side of the frame element 100 do not have rotational symmetry with respect to the axis 22.

[0164] With a central support surface 122 B Central support section 120 B On the corresponding external support surface 122 A and 122 C Two external support sections 120 A and 120 C The gently curving section 124 extends from the center. Section 120 A and 120 C and its corresponding section surface 122 A and 122 C Extending between the corresponding direct connection sections 128. Two lateral support sections 120 A and 120 C The circumferential extension corresponds to the two lateral contact surfaces 50 of the shell tank 12. A and 50 C Circumferential extension.

[0165] Support section 120 D Its supporting surface 122 D At the center of the circular curved section 126, and at the center support section 120 B Extending radially opposite sides. Support section 120 D and supporting surface 122 D The circumferential extension is greater than the contact surface of the shell tank 12 by 50. D Circumferential extension.

[0166] With supporting surface 122 D Support section 120 D It enters the corresponding adjacent direct connection segment 128 of the support ring 116 without steps.

[0167] External support surface 120 B and central support surface 122 D Located at the same axial height. Outer support surface 122 A Center-facing support surface 122 located on support ring 116 B At the side of the connecting ring 104, relative to the central support surface 1220 B Having a certain axial distance of 130, for example, in Figure 18 The axial distance of 130 is indicated in the middle. Another outer support surface 122. C Located on the side of the support ring 116 facing the connecting ring 104, relative to the central support surface 122 B It has a certain axial distance of 132. Outer support surface 122 A The distance 130 is greater than the outer support surface 122. C The distance is 132. The outer support surface is 122. A The distance 130 corresponds to the outer support surface 50 of the shell tank 12. A The distance is 66. The outer support surface is 122. C The distance 132 corresponds to the outer contact surface 50 of the shell tank 12. C The distance is 64.

[0168] Overall, in the region of the support section 120, the axially facing side of the support ring 116 toward the connecting ring 104 is complementary to the axially facing side of the collar 48 of the shell tank 12 away from the bottom 32 of the shell.

[0169] like Figure 3 As shown, the filter media body 90 includes, for example, an outer filter corrugation 134 and an inner filter corrugation 136. Each of the filter corrugations 134 and 136 is composed of a folded filter media, such as a filter nonwoven fabric.

[0170] The outer filter corrugated portion 134 has a hollow truncated cone shape and an elongated elliptical bottom surface. The outer filter corrugated portion 134 is coaxial with axis 22. The bottom surface of the outer filter corrugated portion 134 is located on the side of the main filter element 16, and the frame element 100 of the skeleton 92 is also located on this side. The radially inner wall side of the outer filter corrugated portion 134 extends parallel to its radially outer wall side. The folds of the folded outer filter corrugated portion 134 extend in the axial direction. The folds define the corresponding wall sides.

[0171] The radially outer wall surface of the corrugated portion 134 of the external filter forms the radially outer wall surface 242 of the filter media body 90. The radially outer wall surface 242 of the filter media body 90, relative to its orientation around axis 22, includes two curved sections 244 and two straight connecting sections 246. The curved sections 244 are located on radially opposite sides at the short side 56. The connecting sections 246 are located on radially opposite sides at the long side 54. The curved sections 244 are connected by the straight connecting sections 246.

[0172] The radial thickness of the outer filter corrugated portion 134 is defined by the pleat height. The radial thickness of the outer filter corrugated portion 134 approximately corresponds to the radial distance from the support ring 116 of the frame element 100 of the skeleton 92 to the radial outer ring 112 and the radial outer side of the axial strut 102.

[0173] The outer radial circumference and inner radial circumference of the outer filter corrugated portion 134 decrease in the axial direction from the frame element 100 of the skeleton 92 toward the connecting ring 104. Viewed in the axial direction, the outer filter corrugated portion 134 tapers from the frame element 100 toward the connecting ring 104.

[0174] The radial inner wall side of the outer filter corrugated section 134 is supported on the corresponding radial outer side of the axial strut 102, intermediate ring 108 and connecting arc 110 of the frame 92.

[0175] The inner filter corrugated section 136 has a hollow truncated cone shape and an elongated elliptical bottom surface. The inner filter corrugated section 136 is coaxial with axis 22. The bottom surface of the inner filter corrugated section 136 is located on the side of the main filter element 16, and the connecting ring 104 of the frame 92 is also located on this side. The radially inner wall side of the inner filter corrugated section 136 extends parallel to its radially outer wall side. The folds of the folded inner filter corrugated section 136 extend in the axial direction. The folds define the corresponding wall sides.

[0176] The radial thickness of the inner filter corrugated portion 136 is defined by the folding height. The radial thickness of the inner filter corrugated portion 136 approximately corresponds to the radial thickness of the outer filter corrugated portion 134.

[0177] The radial outer circumference and radial inner circumference of the inner filter corrugated portion 136 decrease in the axial direction away from the connecting ring 104 of the skeleton 92 towards the frame element 100. When viewed in the axial direction, the outer filter corrugated portion 134 tapers from the connecting ring 104 towards the frame element 100.

[0178] The radial outer wall side of the inner filter corrugated section 136 is supported on the corresponding radial inner sides of the axial strut 102, intermediate ring 108, radial inner ring 106 and connecting arc 110 of the frame 92.

[0179] The circumference of the radial outer wall side of the inner filter corrugated portion 136 on the base surface is slightly smaller than the circumference of the radial inner wall side of the outer filter corrugated portion 134 on the cover side. The inner filter corrugated portion 136 is coaxially arranged inside the interior surrounded by the outer filter corrugated portion 134.

[0180] At the side of the connecting ring 104 of the skeleton 92, the base side of the outer filter corrugated part 134 is connected to the base side of the inner filter corrugated part 136 by connecting folds 138 extending circumferentially and radially.

[0181] A flow space 140 is formed between the radially outer circumferential side and the radially inner circumferential side of the inner filter corrugations 136. Each flow space is circumferentially defined by one of two adjacent axial struts 102. The gas to be purified can flow into the flow space 140. The gas to be purified can flow functionally parallel from the inside to the outside in the radial direction through the outer filter corrugations 134, and functionally parallel from the outside to the inside in the radial direction through the inner filter corrugations 136.

[0182] The end member 94 encloses the element interior 42 surrounded by the inner filter corrugation 136 at its axial end face facing the frame element 100. The end member 94 is arranged coaxially with axis 22. The end member 94 has an elongated elliptical cross-section. The end member 94 is circumferentially connected to and supported by the radial inner ring 106 of the frame 92 relative to axis 22. The end member 94 is made of, for example, an elastic material, such as an elastomer.

[0183] The following text will explain in more detail... Figure 5 The seal 96 is shown in detail. The seal 96 is annular and has an elongated elliptical extension when viewed in the axial direction. The seal 96 is made of a single piece of elastic material (e.g., an elastomer). The material of the seal 96 is softer than the material forming the skeleton 92 with the frame element 100.

[0184] The seal 96 includes a retaining section 144 and a sealing section 146.

[0185] The seal 96 is connected to the frame element 100 of the skeleton 92 by means of a retaining section 144. In this case, the seal 96 with the retaining section 144 can be bonded or molded to the axially opposite side of the connecting ring 104 of the frame element 100. The retaining section 144 has a step at the end of the radially outer ring 112 of the skeleton 92 and the radially outer side of the axial strut 102 on the respective radially inner side. The frame element 100 is segmented and embedded therein by the material of the seal 96.

[0186] The retaining section 144 is positioned on the side of the connecting ring 104 facing the axial direction of the support ring 116, thus exposing the support surface 122.

[0187] The retaining section 144 extends radially outward through the radial outer ring 112 of the skeleton 92 and passes through into the sealing section 146 in the region radially outside the support ring 116.

[0188] The sealing section 146 is arranged relative to the axis 22 in a manner directly adjacent to the radial outer wall surface of the support ring 116, and thus in close proximity to the radial outer wall surface of the frame element 100. Furthermore, the sealing section 146 is arranged entirely radially relative to the axis 22 on the outer side of the radial outer wall surface of the filter media body 90.

[0189] The free side 150 of the retaining section 144 extends in a plane perpendicular to axis 22 on the side of the retaining section 144 away from the frame element of the skeleton 92.

[0190] The sealing section 146 is a sealing strut. The sealing section 146 extends axially away from the support ring 116. The free end of the sealing section 146 extends in a virtual plane perpendicular to axis 22. The axial free end 148 of the sealing section 146 protrudes axially beyond the side 150 of the retaining section 144 away from the skeleton 92. The radial outer circumference of the sealing section 146 in the region of its free end 148 is slightly larger than the radial outer circumference of the sealing section 146 in the region of the support ring 116. Correspondingly, the radial inner circumference of the sealing section 146 in the region of its free end 148 is smaller than the radial inner circumference of the sealing section 146 in the region of the transition to the retaining section 144. The sealing section 146 gradually tapers axially from the free end 148 toward the support ring 116.

[0191] The sealing section 146 is radially offset outward relative to the outer wall surface 242 of the filter medium 90.

[0192] like Figure 11As shown in the figure, when the seal 96 is loose, the axial distance 188 between the corresponding segment surface 122 of the frame element 100 of the skeleton 92 and the free end 148 of the seal 96 is greater than the axial distance 190 between the corresponding contact surface 50 of the collar 48 of the shell tank 12 and the free edge 192 of the collar wall 44.

[0193] The recess 152 is located at the transition between the retaining section 144 and the sealing section 146. The recess 152 extends circumferentially relative to the axis 22 along the radially inner side of the sealing section 146 at the side 150 of the retaining section 144 that is axially opposite to the support ring 116.

[0194] Viewed in the axial direction, the sealing section 146 has an elongated elliptical orientation. Viewed in the axial direction, the orientation of the sealing section 146 corresponds to the orientation of the annular wall 44 of the shell tank 12 and the frame element 100 of the skeleton 92.

[0195] The sealing section 146 includes a gently curved section 154 at its short side 56 and a rounded curved section 156 at its opposite short side 56. The gently curved section 154 has a larger radius of curvature than the rounded curved section 156. The gently curved section 154 and the rounded curved section 156 are connected at their respective long sides 54 by a straight connecting section 158.

[0196] The following text will use Figure 3 and Figure 4 A more detailed explanation of the submerged tube sheet 18.

[0197] The immersion tube sheet 18 is implemented as a single piece. The immersion tube sheet 18 is made of a plastic material, such as a rigid plastic material that can be injection molded. For example, the immersion tube sheet 18 is manufactured by an injection molding method.

[0198] The immersion tube sheet 18 includes a plate section 160, a plurality of immersion tubes 162 and ribs 164.

[0199] The plate section 160 extends in a plane perpendicular to axis 22. Within the plate section 160, a plurality of submersible pipes 162 are distributed. Each of the submersible pipes 162 is part of a cyclone separator 166. For example, in... Figure 6 The diagram shows some of the cyclone separators 166. Cyclone separators 166 are designed, for example, as axial cyclone separators. An immersion tube sheet 18 with immersion tubes 162, together with the cyclone housing 20, forms a cyclone block 24. The cyclone block 24 includes a plurality of cyclone separators 166.

[0200] Each of the immersion tubes 162 has the shape of an approximately hollow truncated cylinder, with its axis extending parallel to axis 22. The base surface of the truncated cylinder of the immersion tube 162 is located on the side of the plate section 160. Viewed in the axial direction, the immersion tube 162 tapers away from the plate section 160. The interior of the immersion tube 162 serves as an inlet opening 168 for the gas to be purified.

[0201] The plate segment 160 enters the rib 164 at its radial outer edge. Figure 4 In the diagram, rib 164 is shown in detail. Rib 164 extends continuously in the circumferential direction, coaxial with axis 22. Rib 164 has an overall approximately V-shaped profile.

[0202] One of the legs of the V-rib 164 (hereinafter referred to as axial leg 170) is connected to the edge of the plate segment 160. Axial leg 170 is located radially inward of rib 164. At least in the relaxed state, for example when the submerged tube sheet 18 is not installed, axial leg 170 extends approximately axially and circumferentially parallel to axis 22.

[0203] The other leg of the “V” shape (hereinafter referred to as ramp leg 172) connects to the axial leg 170 on the side axially away from the plate segment 160. The connection edge between the axial leg 170 and the ramp leg 172 (i.e., the closed side of the “V” shape) is hereinafter referred to as rib edge 174. The ramp leg 172 is located radially outward of the rib 164. The ramp leg 172 extends radially outward from the rib edge 174 on the side axially facing the plate segment 160, inclined relative to the axis 22. The free end of the ramp leg 172 is referred to as free edge 176.

[0204] The radially outer side of the ramp leg 172 forms a contact surface 178. When the filter assembly 10 is installed, the contact surface 178 is located at the sealing section 146 of the seal 96 of the main filter element 16, which will be explained in further detail below. The contact surface 178 extends circumferentially at an angle relative to the axis 22. The contact surface 178 extends at an acute angle 180 relative to the axis 22. For example, the angle 180 may be approximately between 30° and 45°.

[0205] The axial distance 182 between the free edge 176 and the rib edge 174 is approximately the same as the axial distance between the rib edge 174 and the plate segment 160.

[0206] Viewed in the axial direction, rib 164 has an elongated elliptical orientation. Viewed in the axial direction, the orientation of rib 164 corresponds to the orientation of the annular wall 44 of the shell tank 12, the frame element 100 of the skeleton 92, and the sealing section 146 of the seal 96.

[0207] Rib 164 includes a gently curved segment 230 at its short side 56 and a rounded curved segment 232 at its opposite short side 56. The gently curved segment 230 has a larger radius of curvature than the rounded curved segment 232. The gently curved segment 230 and the rounded curved segment 232 are connected at their respective long sides 54 by a straight connecting segment 234.

[0208] The circumference of the rib edge 174 corresponds to the circumference of the recess 152 of the seal 96. When the seal 96 is relaxed, for example, in an uninstalled state, the acute angle 180 of the contact surface 178 is greater than the angle between the radially inner sealing surface 184 of the sealing segment 146 of the seal 96 and the axis 22. The axial distance 182 between the rib edge 174 and the free edge 176 of the rib 164 approximately corresponds to the axial distance 186 at the seal 96 between the base of the recess 152 and the free end 148 of the sealing segment 146.

[0209] The following text will use Figure 3 , 6 7. Explain the cyclone shell 20 in more detail.

[0210] The cyclone housing 20 includes a fastening frame 194, multiple separation chambers 196, a particulate discharge device 198, and a total of four clamping clips 78.

[0211] Separation chambers 196 are located within the main body 200 of the cyclone housing 20. Each of the separation chambers 196 is associated with one of the immersion tubes 162 of the immersion tube sheet 18. The immersion tubes 162 and their respective separation chambers 196 form one of the cyclone separators 166. Each separation chamber 196 has an approximately cylindrical shape. The axis of the separation chamber 196 extends parallel to axis 22. When the device 10 is installed, the axis of the separation chamber 196 extends coaxially with the axis of the corresponding immersion tube 162.

[0212] A particulate emission device 198 is arranged radially outward of the main body 200. A separation chamber 196 is fluidly connected to the particulate emission device 198 in a manner inconsequential to the context. In this way, particles (e.g., dust particles) separated from the gaseous medium to be purified in the corresponding cyclone separator 166 can reach the particulate emission device 198.

[0213] The particulate discharge device 198 has a discharge opening 202. During normal operation of the filter device 10, the discharge opening 202 is closed. The discharge opening 202 can be opened to discharge particles collected in the particulate discharge device 198. For example, in Figure 1 In the installation direction of the filter device 10 shown in the figure, the particulate discharge device 198 is spatially arranged at the bottom of the cyclone housing 20. Therefore, the discharge opening 202 is spatially oriented downwards.

[0214] The fastening frame 194 is located at the axial end face of the main body portion 200. On the side of the main body portion 200 arranged axially opposite to the fastening frame 194, each of the separation chambers 196 includes an inlet opening 204 for the gas to be purified. On the side axially facing the fastening frame 194, each of the separation chambers 196 includes an opening for a corresponding immersion tube 196.

[0215] The fastening frame 194 includes an outer frame wall 206, which is connected to the main body portion 200 via a collar 208.

[0216] The outer frame wall 206 and the collar 208 extend continuously around the axis 22 in a circumferential direction.

[0217] The collar 208 extends radially outward away from the main body portion 200 in the radial direction. The outer frame wall 206 extends axially away from the collar 208 and away from the main body portion 200.

[0218] In the region of the free edge of the outer frame wall 206 that is axially away from the main body portion 200, the outer frame wall 206 includes a guide ramp 210 on the radially inner circumferential side. In the region of the guide ramp 210, the radially inner circumference of the outer frame wall 206 becomes larger axially away from the main body portion 200 toward the free edge. The circumferential orientation of the outer frame wall 206 around axis 22 corresponds to the circumferential orientation of the collar 42 of the shell tank 12.

[0219] Viewed in the axial direction, the outer frame wall 206 has an elongated elliptical orientation. Viewed in the axial direction, the orientation of the outer frame wall 206 corresponds to the orientation of the annular wall 44 of the shell tank 12, the frame element 100 of the skeleton 92, the sealing section 146 of the seal 96, and the rib 164 of the submerged tube sheet 18.

[0220] The outer frame wall 206 includes a gently curved segment 236 at its short side 56 and a rounded curved segment 238 at the opposite short side 56. The gently curved segment 236 has a larger radius of curvature than the rounded curved segment 238. The gently curved segment 236 and the rounded curved segment 238 are connected at their respective long sides 54 by a straight connecting segment 240.

[0221] In the axial region between the guide ramp 210 and the main body 200, the radial inner circumference of the outer frame wall 206 is slightly larger than the radial outer circumference of the collar 42 of the shell tank 12.

[0222] Viewed in the axial direction, the radially outer side of the main body 200 has an elongated elliptical orientation. In this case, the curved section at the short side 56 has the same radius of curvature. Therefore, the elongated elliptical orientation of the main body 200 differs from that of the outer frame wall 206. The radially outer circumference of the main body 200 approximately corresponds to the radially outer circumference of the main wall section 46 of the shell tank 12.

[0223] Two of the clamping clips 78 are located on the side of the region where the gently curved section 236 transitions to the corresponding straight connecting section 42. The other two clamping clips 78 are located on the side of the region where the circularly curved section 238 transitions to the corresponding straight connecting section 42.

[0224] Clamping clips 78 are engaged in the region of collar 208 axially away from the outer side of outer frame wall 206. Clamping clips 78 extend beyond the free edge of outer frame wall 206. Clamping clips 78 are, for example, spring clips.

[0225] The method for assembling the filter device 10 will be explained below.

[0226] First, the submerged tube sheet 18 is connected to the cyclone housing 20. For this purpose, the submerged tube sheet 18, having submerged tubes 162, is advanced axially into the fastening frame 194. In this case, it may be necessary to rotate the submerged tube sheet 18 and the cyclone housing 20 relative to each other about axis 22, such that, on one hand, the gently curved section 236 of the outer frame wall 206 coincides with the gently curved section 230 of the rib 164, and the circularly curved section 240 of the fastening frame 194 coincides with the circularly curved section 232 of the rib 164. During assembly, the submerged tubes 162 are respectively arranged in one of the separation chambers 196. Subsequently, the submerged tube sheet 18 is secured to the cyclone housing 20 using screws 28. In the future, if the main filter element 16 and / or the post-filter element 14 are replaced from the filter assembly 10, the submerged tube sheet 18 can remain in the cyclone housing 20. In this way, the entire cyclone block 24 can be separated from the housing tank 12.

[0227] The rear filter element 14 is inserted into the housing 12 axially through the maintenance opening 34 with its side facing away from the seal 88. In this case, it may be necessary to rotate the housing 12 and the rear filter element 14 relative to each other about axis 22, such that the long side 54 of the rear filter element 14 coincides with the long side 54 of the housing 12, and the short side 56 of the rear filter element 14 coincides with the short side 56 of the housing 12. The rear filter element 14 is placed in the stepped section of the housing wall 30, axially adjacent to the bottom 32 of the housing.

[0228] Subsequently, the main filter element 16 is inserted axially into the filter element interior 36 of the housing 12 through the maintenance opening 34, with its axially opposite side to the seal 96. For this purpose, it may be necessary to rotate the housing 12 and the main filter element 16 relative to each other about the axis 22, such that the short side 56 of the gently curved section 124 of the frame element 100 with skeleton 92 of the main filter element 16 and the short side 56 of the gently curved section 154 of the seal 88 coincides with the short side 56 of the gently curved section 58 of the housing 12 with an annular wall 44.

[0229] The main filter element 16 is inserted into the housing tank 12 in the axial direction until the support surface 122 of the frame 92 axially contacts the corresponding contact surface 50 of the collar 42. This installation stage is... Figure 10 and 11 As shown in the diagram. During this installation phase, the radially outer wall surface 212 of the sealing section 146 is spaced radially from the inner wall surface 86 of the collar wall 44 of the housing 12. A radial gap 214 is provided between the radially outer wall surface 212 of the seal 96 and the inner wall surface 86 of the collar 42. The radial gap 214 extends circumferentially relative to the axis 22 and extends axially through the entire axial extension of the inner wall surface 86. Figure 10 and 11 In the installation state shown in the figure, the free end 148 of the sealing section 146 protrudes axially beyond the free edge 192 of the annular wall 44 of the shell tank 12.

[0230] Subsequently, the cyclone block 24 with the submerged tube sheet 18 is pushed axially onto the collar 42 of the shell tank 12. In this case, it may be necessary to rotate the shell tank 12 and the cyclone block 24 about the axis 22 such that the short side 56 of the collar wall 44 with the gently curved section 58 coincides with the short side 56 of the outer frame wall 206 of the cyclone shell 20 with the gently curved section 236, and correspondingly, the short side 56 of the collar wall 44 with the circular curved section 60 coincides with the short side 56 of the outer frame wall 206 with the circular curved section 238.

[0231] During axial insertion, the free edge 192 of the collar wall 44 is initially guided radially inward along the guide ramp 210 of the outer frame wall 206 of the cyclone housing 20, and thus centered within the fastening frame 94. Upon further insertion, the radially outer side of the ramp leg 172 of the rib 164 of the submerged tube sheet 18 slides along the radially inner sealing surface 184 of the seal 96. Because the frame leg 172 has a larger angle of inclination relative to the axis 22 than the radially inner sealing surface 184 of the seal 96, the rib 164 radially pushes the sealing section 146 against the inner wall surface 86.

[0232] Upon further insertion, the rib edge 174 of rib 164 is immersed in the recess 152 of seal 96. Furthermore, the collar 208 of cyclone housing 20 presses against the free end 148 of sealing section 146 in the axial direction. In this way, sealing section 146 is compressed and deformed in the axial direction. The material of sealing section 146 yields to the axial compression in the radial direction. In this way, an additional increase in radially acting contact pressure is provided, which is used to press sealing section 146 against the inner wall surface 86 of collar wall 44.

[0233] The free end of the clamp 78 is hooked behind the corresponding joint section 76, such as Figure 1 As shown. Subsequently, the clamping clamp 78 is clamped. In this way, the cyclone block 24 is forcefully pushed against the collar 42 in the axial direction. Axial movement is restricted because the free edge 192 of the collar wall 44 of the shell tank 12 is supported in the axial direction at the collar 208 of the cyclone shell 20, as shown. Figure 6 and Figure 7 The diagram is shown in the image.

[0234] exist Figure 1 , 6 In the final installation position illustrated in Figure 7, the radially outer wall surface 212 of the seal 96 is tightly sealed against the contact section 218 at the inner wall surface 86 of the collar 42 of the housing 12. The contact section 218 begins at an axial distance 220 relative to the frame element 100 of the skeleton 92, particularly relative to the corresponding contact surface 50, and extends axially to the free edge of the collar wall 44. A residual gap 222 is left between the frame element 100 and the starting point of the contact section 218, between the radially outer circumferential side of the seal section 146 and the inner wall surface 86 of the collar wall 44. The residual gap 222 extends continuously circumferentially and axially. The residual gap 222 has a wedge-shaped profile that decreases axially toward the contact section 218.

[0235] Each immersion tube 162 includes an outlet end 248 on its side facing the inflow side 226 of the filter element 16. The outlet end 248 is surrounded by an immersion tube edge segment 250. The immersion tube edge segments 250 of adjacent immersion tubes 162 pass through each other. The immersion tube edge segments 250 are formed in the plate segment 160 of the immersion tube plate 18.

[0236] like Figure 7 As shown in the diagram, when the filter device 10 is installed, the edge section 250 of the immersion tube is located at an axial distance 252 from the free end 148 of the circumferential seal 96, which is radially inner to the sealing section 146.

[0237] Viewed axially, the outflow end 248 of the immersion tube 162 is located outside the axially free end 148 on the inflow side of the circumferential seal 96. Viewed axially, the edge section 250 of the immersion tube surrounding the outflow end 248 and the outflow end 248 of the immersion tube 162 are immersed behind the free end 148 of the circumferential seal 96, and thus behind the inflow end of the main filter element 16.

[0238] With the sealing section 146 and retaining section 144 of the sealing element 96 installed, a sealing chamber 224 is formed between the immersion tube sheet 18 and the shell tank 12. The sealing chamber 224 is defined radially inward by the ribs 164 of the immersion tube sheet 18, radially outward by the inner wall surface 86 of the collar wall 44 of the shell tank 12, and axially by the collar 208 of the cyclone shell 20 connected to the immersion tube sheet 18.

[0239] For example, for installation in a machine where the filter device 10 needs to purify the gaseous medium, the short side 56 of the filter device 10 is spatially mounted at the bottom, and the particle discharge device 198 of the cyclone block 24 is arranged at said short side 56. In this case, the axis 22 is arranged substantially horizontally.

[0240] In operation of the filter device 10, the gaseous medium to be purified (e.g., air) is drawn in through the inlet opening 204 of the cyclone separator 166. Figure 6 The flow of gaseous medium within the filter device 10 is illustrated by a curved arrow.

[0241] Coarse separation of particles takes place in cyclone separator 166. The separated particles settle downwards under gravity to particle discharge device 198, where they are collected. The discharge opening 202 of particle discharge device 198 is opened when needed or for maintenance, and particle discharge device 198 is emptied.

[0242] The pre-purified gaseous medium passes through the inlet opening 168 of the immersion pipe 162 to the inflow side 226 of the main filter element 16. The inflow side 226 is located on the side of the main filter element 16, and the seal 96 is also located on this side.

[0243] The gaseous medium to be purified flows into the flow space 140 between the outer filter corrugation 134 and the inner filter corrugation 136. In this manner, the gaseous medium is circumferentially distributed as it flows through the connecting opening 114. The gaseous medium to be purified flows radially from the flow space 140 through the outer filter corrugation 134 to the outside, where it is further purified, and reaches the annular space radially outward surrounding the main filter element 16. Functionally parallel, the gaseous medium to be purified flows radially from the outside through the inner filter corrugation 136 (where it is further purified) to the inside, reaching the element interior 142.

[0244] The gaseous medium purified in the second stage from the annular space and the gaseous medium purified in the second section from the interior 42 of the element reach the outlet side 228 of the main filter element 16. The outlet side 228 of the main filter element 16 is located on the side axially opposite to the inflow side 226.

[0245] The gaseous medium purified in the second stage flows from the outflow side 128 into the post-filter element 14, and is further purified by the post-filter element 14.

[0246] The gaseous medium, having undergone a total of three stages of purification, exits the filter unit 10 through the outlet opening 40 of the filter housing 26. The purified gaseous medium is then drawn in by the corresponding components of the machine from this point.

Claims

1. A filter device (10) for gaseous media, particularly air. - Includes a filter housing (26) having at least one inlet opening (168) for the gaseous medium to be purified and at least one outlet opening (40) for the gaseous medium to be purified. -in, At least one filter element (16), comprising at least one filter media body (90), is arranged in a filter housing (26) relative to the airflow between at least one inlet opening (168) and at least one outlet opening (40), such that it separates the unpurified side associated with the inlet opening (168) from the clean side associated with the outlet opening (40). -The filter housing (26) includes a first housing portion (12), the at least one outlet opening (40) is disposed at the first housing portion, and the first housing portion includes at least one filter element receiving space (36), in which at least one filter element (16) is disposed. -and wherein the filter housing (26) includes a second housing portion (18), the at least one inlet opening (168) is disposed at the second housing portion, and the second housing portion includes at least a portion (162) of at least one cyclone separator (166). - wherein the second housing portion (18) closes the maintenance opening (34) of the first housing portion (12), and the first and second housing portions (12, 18) are releasably connected to and separable from each other so that the at least one filter element (16) can be removed through the maintenance opening (34) of the first housing portion (12). Its features The at least one filter element (16) includes a seal (96) extending circumferentially around a virtual axis (22) on the inflow side (226) facing the second housing portion (18). The seal includes a sealing section (146) that acts at least partially in a radially sealing manner relative to the axis (22) and extends circumferentially around the axis (22), wherein, relative to the axis (22), the radially outer circumferential side (212) of the sealing section (146) abuts tightly in a sealing manner against the radially inner inner wall surface (86) of the first housing portion (12) relative to the axis (22). A rib (164) extending at least partially circumferentially around axis (22) and protruding away from the second housing portion (18) in at least one directional component in the axial direction relative to axis (22) applies contact pressure to the circumferential seal (96) so as to press the circumferential sealing section (146) which acts at least partially radially sealingly against the inner wall surface (86) of the first housing portion (12).

2. The filter device according to claim 1, characterized in that, The rib (164) supports the circumferential sealing section (46) which acts at least partially radially sealingly at the radially inner circumferential side (184) of the sealing section (146), particularly at the radially inner circumferential side (184) of the sealing section (146) which is radially positioned relative to the inner wall surface (86) of the first housing portion (12).

3. The filter device according to claim 1 or 2, characterized in that, The rib (164) contacts the circumferential seal (96) at the axial end face (150) relative to the axis (22), the axial end face facing the second housing portion (18), wherein the directional component of the contact pressure acts in the axial direction relative to the axis (22).

4. The filter device according to any one of the preceding claims, characterized in that... The ribs (164) are at least partially configured to have a ramp shape. and / or The contact surface (178) of the radially inner circumferential side (184) of the circumferential sealing section (146) of the rib (164) which acts at least partially radially sealingly is positioned at an acute angle (180) to the axis (22).

5. The filter device according to any one of the preceding claims, characterized in that... The circumferential sealing section (146) that at least partially acts radially in a sealing manner is at least partially offset radially outward relative to the outer wall surface (242) of the filter media body (90) relative to the axis (22). and / or The circumferential sealing section (146) that at least partially acts radially to seal the filter media body (90) extends axially at least partially beyond the inflow side (226).

6. The filter device according to any one of the preceding claims, characterized in that... The filter device (10) includes a cyclone block (24) having a plurality of cyclone separators (166), wherein the cyclone block (25) includes an immersion tube plate (18) as a second housing portion (18) of the filter housing (26), the immersion tube plate including a plurality of immersion tubes (162), and wherein the circumferential ribs (164) are formed at the immersion tube plate (18). and / or The at least one inlet opening (168) is arranged at one or more portions of the at least one cyclone separator (166), particularly in the submerged tube (162) of the at least one cyclone separator. and / or The second housing portion (18) includes a portion of a cyclone block (24) which includes a plurality of cyclone separators (166). and / or The second housing portion (18) includes or has at least one immersion tube sheet (162) with a cyclone separator (166). and / or The second housing portion (18) includes multiple immersion tubes (162) of the corresponding cyclone separator (166). and / or The second housing portion (18) is arranged between the first housing portion (12) and the cyclone housing (20) of the cyclone block (24) to which at least one cyclone separator (166) belongs.

7. The filter device according to any one of the preceding claims, characterized in that... Viewed in the axial direction relative to the axis (22), the axial end (148) of the inflow side of the circumferential seal (96) protrudes beyond the free end (176) of the rib (164) of the second housing portion (18). and / or Viewed in the axial direction relative to the axis (22), the rib (164) protrudes beyond the free end (148) of the circumferential seal (96), particularly the free end (148) of at least one sealing segment (146). and / or The rib (164) is immersed in the recess (152) of the circumferential seal (96), which has a side opening facing the inflow side (226) axially relative to the axis (22). and / or The second housing portion (18) includes at least one immersion tube (162) of at least one cyclone separator (166), which includes an outflow end (248) on its inflow side (226) facing at least one filter element (16), the outflow end being at least partially surrounded by an edge section (250) of the immersion tube, wherein, when the filter device (10) is installed, the edge section (250) of the immersion tube is located radially inside the sealing section (146) and has an axial distance (252) relative to the free end (148) of the circumferential seal (96).

8. The filter device according to any one of the preceding claims, characterized in that, The first housing portion (12) includes a radially projecting collar (42) that extends at least partially circumferentially, the collar providing at least one axial contact surface (50). A 50 B 50 C At least one radially protruding support segment (120) of the filter element (16) A 120 B 120 C 120 D It is supported at the axial contact surface.

9. The filter device according to claim 8, characterized in that, The collar (42) includes at least two axial contact surfaces (50). A 50 B 50 C 50 D ), especially the four axial contact surfaces located at different axial heights (50 A 50 A 50 C 50 D ), and / or The collar (42) includes at least two collar segments, particularly four collar segments and corresponding contact surfaces (50). A 50 B 50 C 50 D Each of the contact surfaces extends circumferentially around the axis (22).

10. The filter device according to claim 8 or 9, characterized in that, The contact area (218) of the sealing section (146) is arranged on at least one axial contact surface (50) with the collar (42). A 50 B 50 C 50 D At a certain axial distance (220), in the contact area, the sealing section (146) radially seals against the inner wall surface (86) of the first housing portion (12).

11. The filter device according to any one of the preceding claims, characterized in that, The first housing portion (12) and the second housing portion (18) form a sealing chamber (224) in which a circumferential sealing section (146) acts at least partially radially, wherein the sealing chamber (224) is radially defined inward by a rib (164) of the second housing portion (18), radially defined outward by an inner wall surface (86) of the first housing portion (12), and axially defined by a collar (208) connected to the second housing portion (18), particularly by a collar (208) connected to another portion (20) of the second housing portion (18).

12. The filter device according to any one of the preceding claims, characterized in that, The circumferential seal (96) is defined by a frame element (100) at its axial end away from the second housing portion (18), the frame element at least partially surrounding the axis (22) and connected to the filter media body (90), wherein the surface of the frame element (100), in particular the frame element (100), is at least partially exposed, and wherein the at least exposed portion of the frame element (100), in particular the frame element (100), at least partially forms the radially projecting support portion (120) of the filter element (16). A 120 B 120 C 120 D The support section is supported on the axial support surface (50) of the radially protruding collar (42) of the first housing part (12). A 50 B 50 C 50 D ) place.

13. The filter device according to claim 12, characterized in that... The frame element (100) extends at least partially axially and / or radially inward in the direction toward the inflow side (226) starting from the at least one exposed section. and / or The frame element (100) is at least partially embedded by the material of the circumferential seal (96).

14. The filter device according to any one of the preceding claims, characterized in that, With at least one filter element (16) of the filter device (10) arranged in at least one filter element receiving space (36) and the second housing portion (18) released from the first housing portion (12), there is a radial gap (214) between the inner wall surface (86) of the second housing portion (18) and the radially outer circumferential side of the circumferential sealing section (146) that at least partially acts radially in a sealing manner.

15. The filter device according to any one of the preceding claims, characterized in that... The filter media body (90) includes a cross-sectional shape that includes at least two curved edges (56) connected to each other by two straight edges (54). and / or The filter media body (90) includes a radially outer filter media section (134) and a radially inner filter media section (136), each of which is circumferentially continuous relative to the axis (22), wherein the radially inner filter media section (136) is arranged inside the radially outer filter media section (134). and / or The outer wall of the filter media body (90), particularly the outer wall of the radially outer filter media section (134) of the filter media body (90), includes an elongated elliptical cross-section. and / or The inner wall of the filter media body (90), particularly the inner wall of the radially inner filter media section (136) of the filter media body (90), comprises an elongated elliptical cross-section. and / or Viewed from the inflow side (226) in the direction of axis (22), the outer wall of the filter medium body (90), especially the outer wall of the radially outer filter medium section (134) of the filter medium body (90), tapers, especially in a conical shape, and / or viewed from the outflow side in the direction of axis (22), the inner wall of the filter medium body (90), especially the inner wall of the radially inner filter medium section (136) of the filter medium body (90), tapers, especially in a conical shape.

16. The filter device according to any one of the preceding claims, characterized in that... At least one filter media section (134) of the filter media body (90), particularly the radially outer filter media section (134) of the filter media body (90), is capable of flowing from the inside to the outside in the radial direction. and / or At least one filter media section (136) of the filter media body (90), particularly the radially inner filter media section (136) of the filter media body (90), is capable of flowing from the outside to the inside in the radial direction.

17. The filter device according to any one of the preceding claims, characterized in that... The at least one filter media body (90) includes at least two filter corrugations (134, 136), particularly an inner filter corrugation (136) and an outer filter corrugation (134), particularly at least two folded filter corrugations, which extend at least partially around the axis (22) and are passed through in parallel by the gaseous medium to be purified. and / or The inner filter corrugation (136) of the at least one filter media body (90) is arranged inside the interior surrounded by the outer filter corrugation (134) of the at least one filter media body (90). and / or The at least one filter media body (90) includes at least one filter corrugation (134, 136), particularly an inner filter corrugation (136) and / or an outer filter corrugation (134), which includes an inclination relative to the axis (22).

18. The filter device according to any one of the preceding claims, characterized in that, The filter device (10) includes at least one additional filter element (14), particularly a secondary filter element (14), which is fluidly arranged downstream of at least one filter element (16) having a circumferential seal (96), particularly the main filter element (16).

19. A filter element (16) for a filter device (10) for a gaseous medium, particularly air, especially for a filter element (16) for a filter device (10) according to the invention, comprising at least one filter medium body (90). -The filter device (10) therein includes a filter housing (26) having at least one inlet opening (166) and at least one outlet opening (40). -The filter element (16) is received in a filter housing (26) between an inlet opening (168) and an outlet opening (40) to separate the unpurified side associated with the at least one inlet opening (168) from the clean side associated with the at least one outlet opening (40). -And wherein the filter housing (26) includes a first housing portion (12), the outlet opening (40) is arranged at the first housing portion and the first housing portion includes at least one filter element receiving space (36), in which at least one filter element (16) may be arranged. -And wherein the filter housing (26) includes a second housing portion (18), the inlet opening (168) being disposed at the second housing portion and the second housing portion including at least a portion of a cyclone separator (166), -in, The second housing portion (18) closes the maintenance opening (34) of the first housing portion (12), and the first housing portion (12) and the second housing portion (18) are releasably connected to and separable from each other so that the at least one filter element (16) can be removed through the maintenance opening (34) of the first housing portion (12). Its features The at least one filter element (16) includes a seal (96) extending circumferentially around a virtual axis (22) on the inflow side (226) facing the second housing portion (18). This seal includes a sealing section (146) that acts at least partially radially in a sealing manner relative to the axis (22) and extends circumferentially around the axis (22), wherein the circumferentially outwardly oriented side of the sealing section (146) relative to the axis (22) can make tight sealing contact with the axis (22) at a radially inward inner wall surface (86) of the first housing portion (12). Contact pressure can be applied to the circumferential seal (96) by means of a rib (164) that extends at least partially around the axis (22) circumferentially and protrudes from the second housing portion (18) in at least the axial direction with at least one directional component, so as to press the circumferential sealing section (146) capable of acting at least partially radially sealing against the inner wall surface (86) of the first housing portion (12).

20. Use of a filter element (16) comprising at least one filter media body (90) in a filter device (10) for a gaseous medium, particularly in a filter device (10) according to any one of claims 1 to 19, Features are The filter element (16) includes a circumferential seal (96) on the inflow side (226) of the second housing portion (18) facing the filter device (10). This circumferential seal includes a circumferential sealing section (146) that acts at least partially radially sealingly against the radially inner inner wall surface (86) of the first housing portion (12) relative to the axis (22) on its radially outer circumferential side. At least a portion of the circumferential ribs (164) protruding from the second housing portion (18) in the axial direction with at least one directional component apply contact pressure to the circumferential seal (96) to press the circumferential sealing section (146) that acts at least in a radial sealing manner against the inner wall surface (86) of the first housing portion (12).

21. A method for assembling a filter device (10) for a gaseous medium, particularly a filter device according to any one of claims 1 to 19, wherein, At least one filter element (16) is inserted through a maintenance opening (34) into the filter element receiving space (36) of a first housing portion (12) of the filter housing (26) of the filter assembly (10), the first housing portion including at least one outlet opening (40) for the gaseous medium to be purified, and subsequently, the maintenance opening (34) is closed by a second housing portion (18) of the filter housing (26), the second housing portion including at least one inlet opening (168) for the gaseous medium to be purified and at least one cyclone separator ( At least a portion of 166) is characterized in that a seal (96) extending circumferentially around a virtual axis (22) at the inflow side (226) of at least one filter element (16) facing the second housing portion (18) is pressed against the radially inner inner wall surface (86) of the first housing portion (12) in a sealing manner relative to the axis (22) at least partially radially, the seal (96) being at least partially radially sealed relative to the axis (22), the seal (96) being protruding from the second housing portion (18) in the axial direction relative to the axis (22) with at least one directional component and at least partially surrounding the axis (22).

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