Filter system with a resonator, filter element, and secondary element for use in a filter system

Abstract

Filter system (100) for filtering a fluid, at least comprising - a filter housing (110) with at least one housing upper part (112) and one housing lower part (114) extending along a housing axis (M), - a filter package (1) that separates a clean fluid side (52) and a raw fluid side (50) in a fluid-tight manner, comprising at least one filter element (10), wherein the at least one filter element (10) comprises a hollow cylindrical filter bellows (12) arranged about its longitudinal axis (L), wherein the filter element (10) is closed at at least one first end face (26) and has a first end disk (14) which is opposite a second end disk (16) with a fluid passage (29) for the filtered fluid, - and a resonator (40) with a resonator body (41) having two opposing open ends (42, 43), wherein the resonator (40) is arranged inside the filter package (1), and wherein an open end (42, 43) of the resonator (40) is closed by a bottom element (17) that closes the filter package (1) at least partially at its end face, wherein the filter package (1) comprises a central tube (30) arranged inside the filter bellows (12), wherein the bottom element (17) is designed as the bottom (31) of the central tube (30) which is firmly connected to the resonator (40), and wherein the resonator (40) is connected to the central tube (30) via a snap connection (44).

Description

Technical field

[0001] The invention relates to a filter system for filtering a fluid with a resonator, as well as a filter element and a secondary element for such a filter system, in particular an air supply system of an internal combustion engine, in particular of a motor vehicle. State of the art

[0002] From US patent 2014 / 102304 A1, an air filter assembly for an engine is known, comprising a filter element, a sound-absorbing element, and an end cap. The filter element is a cylindrical filter element that defines a hollow interior. The sound-absorbing element extends into the hollow interior of the cylindrical filter element. The sound-absorbing element has a flange at one end. The flange has a diameter larger than the diameter of the hollow interior. The end cap is attached to the cylindrical filter element and serves to fix the sound-absorbing element relative to the filter element. The sound-absorbing element is effective in reducing engine noise that travels through the air filter assembly.

[0003] From DE 10 2019 210 078 A1, an air filter module, particularly for a fresh air system of an internal combustion engine, is known. The air filter module comprises a plastic filter housing that surrounds an interior chamber through which air flows. The air filter module further comprises a plastic resonator that defines a hollow chamber for damping airborne noise, wherein the resonator is arranged in the interior of the housing and is at least partially integrally formed with the filter housing. The air filter module is easy to manufacture and requires little installation space. Disclosure of the invention

[0004] One objective of the invention is to create a filter system for filtering a fluid with a resonator, which enables improved noise reduction.

[0005] Another task is to provide a filter element for such a filter system, which enables improved noise reduction.

[0006] Another task is to provide a secondary element for such a filter system, which enables improved noise reduction.

[0007] The aforementioned problem is solved according to one aspect of the invention by a filter system for filtering a fluid, comprising at least a filter housing with at least one housing upper part and one housing lower part extending along a housing axis, a filter pack that fluid-tightly separates a clean fluid side and a raw fluid side, comprising at least one filter element, wherein the at least one filter element comprises a hollow cylinder-like filter bellows arranged about its longitudinal axis, wherein the filter element is closed at at least one first end face and has a first end disk opposite a second end disk with a fluid passage for the filtered fluid, and a resonator with a resonator body having two opposing open ends, wherein the resonator is arranged inside the filter pack.and wherein an open end of the resonator is closed by a bottom element that at least partially closes off the front of the filter package.

[0008] The further problem is solved by a filter element for use in a filter system, with a hollow cylindrical filter bellows arranged around its longitudinal axis, wherein the filter element is closed at a first end face and the first end face has at least a first end disk opposite a second end disk with a fluid passage for the filtered fluid.

[0009] The further task is solved by a secondary element for use in a filter system, with a hollow cylindrical filter bellows arranged around its longitudinal axis, wherein the secondary element has an end disk at one end face.

[0010] Favorable embodiments and advantages of the invention will become apparent from the further claims, the description and the drawing.

[0011] According to one aspect of the invention, a filter system for filtering a fluid is proposed, comprising at least a filter housing with at least one housing upper part and one housing lower part extending along a housing axis, a filter assembly that fluid-tightly separates a clean fluid side and a raw fluid side, comprising at least one filter element, wherein the at least one filter element comprises a hollow cylindrical filter bellows arranged about its longitudinal axis, and wherein the filter element is closed at at least one first end face and has a first end disk opposite a second end disk with a fluid passage for the filtered fluid, as well as a resonator with a resonator body having two opposing open ends. The resonator is arranged inside the filter assembly.In this arrangement, an open end of the resonator is closed by a bottom element that at least partially closes off the front of the filter package.

[0012] Advantageously, the filter system, which is designed for filtering a fluid, in particular an air intake system of an internal combustion engine, especially of a motor vehicle, features a resonator for noise reduction of the flowing fluid as it passes through the filter element of the filter system. The resonator can be permanently connected to the filter housing, for example by welding, or be replaceable, for example by clipping or screwing, and arranged on the clean fluid side of the filter system.

[0013] The fact that the filter element is closed at at least one first end face and has a first end disc includes the embodiments that the complete end disc is made of polyurethane (PUR), or that the essentially closed end disc made of polyurethane in combination with the bottom of the central tube, which is made of plastic, for example, is formed as an end disc, or that a completely bonded or welded plastic or metal end disc is present.

[0014] The hollow cylindrical filter bellows has a closed circumferential wall that surrounds a longitudinal axis and can have any desired cross-section. The cross-section of the filter bellows can be circular, rectangular, triangular, polygonal, oval, or similar, and can be conveniently adapted to the available installation space. The filter bellows can contain a pleated filter medium or wound layers of filter medium. A combination of pleated and wound filter media is also possible.

[0015] For acoustic reasons, the resonator can advantageously be designed as a tube comprising a resonator body with two open ends. The resonator is arranged inside the filter assembly such that one of its open ends is closed by a base element that seals the filter assembly, at least partially, at its end face. In particular, the resonator can expediently be arranged concentrically to the housing axis to achieve advantageous acoustic damping of the filter system.

[0016] The filter package can, for example, include a filter element that is open along its longitudinal axis at least on one end face, with one side of the filter element sealing against the filter housing.

[0017] In one embodiment, an end disc of the filter element can close and seal an open end of the resonator tube. The seal can be designed as a two-component (2K) seal, a polyurethane (PUR) seal, an O-ring or plastic-to-plastic seal, or a labyrinth seal. The seal can be located, for example, on the end disc of the filter element, on the central tube, or on the resonator body.

[0018] The filter element can, for example, have a complete end disc made of PUR. Alternatively, the filter assembly can also have an end disc consisting of a partially closed PUR end disc of the filter element and the base of a central tube, for example, made of plastic. In further embodiments, the filter element can also have a fully bonded or welded plastic or metal end disc.

[0019] The filter assembly can further include a secondary element, which is arranged inside the filter element as a safety element and also seals against the filter housing. The secondary element serves to prevent raw fluid from reaching the clean fluid side and thus the clean fluid outlet when the filter element is changed. The secondary element can, for example, be designed as a so-called sock element, which is sealed at the end not sealed against the filter housing with a tight-fitting plastic cap. Alternatively, the secondary element can also be designed as a screwed-on safety element, which is closed at this end with an end plate. In the case of the sock element, a support structure for the secondary element to support the filter bellows can be part of the housing or clipped, welded, or screwed in as a separate component.

[0020] In one embodiment, an end plate of the secondary element can close and seal an open end of the resonator tube. The resonator can be sealed against the secondary element by a sealing device on the end plate. This seal can be, for example, a two-component seal, a polyurethane seal, an O-ring seal, a plastic-to-plastic seal, or a labyrinth seal. The seal can be located on the end plate of the secondary element or on the resonator itself.

[0021] Such a resonator can be accommodated in a filter system in a space-saving manner and can be manufactured cost-effectively.

[0022] In a favorable design of the filter system, the resonator and the filter assembly can be connected via a sealing device. An open end of the resonator can advantageously be sealed by the filter element or a secondary element, for example, by an end plate. In this way, the filter element and / or the secondary element can seal the resonator at its open end. The seal can be, for example, a two-component seal, a polyurethane seal, an O-ring seal, a plastic-to-plastic seal, or a labyrinth seal. The seal can be located on the end plate of the secondary element or filter element, or on the resonator itself.

[0023] Depending on a favorable design of the filter system, the sealing device can be a two-component seal encircling the outer circumference of the resonator, a polyurethane seal, or an O-ring seal. This ensures a reliable seal of the resonator. Alternatively, the sealing device can be a seal located on the inner circumference of the resonator. A labyrinth seal (plastic / plastic) is also possible.

[0024] According to a favorable embodiment of the filter system, the base element can be designed as an end plate to which the open end of the resonator is connected, in particular by screwing, clipping, gluing, or bayonet fitting. In this way, the open end of the resonator can be closed simply and reliably, allowing the resonator to exert its acoustic damping effect.

[0025] In the filter system, the filter assembly comprises a central tube arranged inside the filter bellows, with the bottom element forming the base of the central tube, which is firmly connected to the resonator, in particular formed as a single piece with the resonator. This allows the open end of the resonator to be closed without the need for an additional component as a base. The resonator can thus be manufactured cost-effectively. Its assembly can also be designed more efficiently.

[0026] In the filter system, the resonator is connected to the central tube via a snap-fit ​​connection. This allows the resonator to be easily inserted into the filter element and removed when the filter element needs to be replaced. This makes the resonator inexpensive to reuse, as it is essentially not subject to wear.

[0027] According to a favorable embodiment of the filter system, the filter assembly within the central tube can include a secondary element with a hollow cylindrical filter bellows arranged around its longitudinal axis and around the housing axis. An open end of the resonator can be closed by the end plate of the filter assembly.

[0028] Advantageously, the resonator can be arranged at least partially, in particular concentrically, to the longitudinal axis of the secondary element, inside the secondary element.

[0029] The filter assembly can further include a secondary element, which is arranged inside the filter element as a safety element and also seals against the filter housing. The secondary element serves to prevent dirt particles from the raw fluid from reaching the clean fluid side and thus the clean fluid outlet when the filter element, especially the main filter element, is changed. The secondary element can, for example, be designed as a so-called sock element, which is sealed at the end not sealed against the filter housing with a tight-fitting plastic cap. Alternatively, the secondary element can also be designed as a screwed-on safety element, which is closed at this end with an end plate. In the case of the sock element, a support structure for the secondary element to support the filter bellows can be part of the housing or clipped, welded, glued, or screwed in as a separate component.The type of fastening can be chosen as needed.

[0030] In one embodiment, an end plate of the secondary element can close and seal an open end of the resonator tube. The resonator can be sealed against the secondary element by a sealing device on the end plate. This seal can be, for example, a two-component seal, a polyurethane seal, an O-ring seal, a plastic-to-plastic seal, or a labyrinth seal. The seal can be located on the end plate of the secondary element or on the resonator itself.

[0031] According to a favorable design of the filter system, the secondary element can be designed as a sock-like element whose end plate tightly encloses the open end of the resonator. This allows the open end of the resonator to be reliably closed and sealed in a simple manner.

[0032] According to a favorable design of the filter system, the sealing device can be arranged in the end disc of the sock element. This allows the open end of the resonator to be reliably closed and sealed in a simple manner.

[0033] According to a favorable embodiment of the filter system, the base element can be designed as the end plate of the secondary element. In this configuration, the open end of the resonator, facing away from the first end plate of the filter element, can be closed by the end plate. In this way, a resonator can be used for noise reduction, the open end of which faces the first end plate of the filter element and the closed end of which is formed by the end plate of the secondary element. In this embodiment, the resonator is arranged outside the secondary element.

[0034] According to a favorable design of the filter system, the resonator can be connected to a support structure of the secondary element, in particular, connected in one piece. This allows the open end of the resonator to be closed without the need for an additional component as a base. The resonator can thus be manufactured cost-effectively. Its assembly can also be designed more efficiently in this way.

[0035] According to a favorable embodiment of the filter system, the resonator can be connected to the end plate and / or the support structure of the secondary element via a snap-fit ​​connection. In an alternative embodiment, the resonator can be interchangeably connected to the secondary element. This can be achieved, for example, via a snap-fit ​​connection that can also be released again, if necessary, to remove the resonator from the secondary element.

[0036] According to a favorable embodiment of the filter system, the resonator can pass through the end disk of the secondary element, with an open end of the resonator facing the first end disk of the filter element being fluid-tightly connected to a coupling piece arranged on the first end disk of the filter element. This allows the open end of the resonator to be closed by the end disk, although a certain distance is maintained between the open end of the resonator and the end disk, which is, however, tightly sealed by the coupling piece.

[0037] The open end of the resonator can be at least acoustically sealed to the end plate of the filter element. Acoustically sealed means that the acoustic measure is effective. A certain amount of leakage for the fluid being filtered may still be permissible.

[0038] This acoustic tightness can be advantageous for all interfaces between the resonator and the other components such as the main element and / or secondary element.

[0039] According to a favorable design of the filter system, the open end of the resonator or the coupling piece can have a coupling area, wherein the other of the two coupling partners has a sealing structure that completely overlaps the coupling area. In this way, the resonator body and the coupling piece can be reliably and tightly connected.

[0040] Advantageously, the filter system can incorporate additional measures on the closed side of the filter pack to reduce noise emissions. For example, a resonator structure can be integrated into the base of the filter pack as a shunt resonator. At least one element-side resonator structure can be formed on the base to dampen the noise of a flowing fluid. The element-side resonator structure can have two grooves separated by a partition, with at least one of the two grooves connected to an interior space of the filter pack via an opening. A housing-side resonator structure, complementary to the element-side resonator structure, can be formed on an inner surface of the lower housing section, which also has two grooves separated by a partition. During the intended assembly of the filter system, the element-side resonator structure can form a tight seal with the housing-side resonator structure.The element-side and housing-side grooves can be fluidically connected to at least one of the two resonator structures via connecting openings in at least one of the partition walls.

[0041] The housing-side resonator structure can be formed on the inside of the lower housing section and can advantageously be designed as a mirror image complementary to the element-side resonator structure. When the filter element is installed in the filter housing and the filter housing is closed with the lower housing section, the two resonator structures interact, forming two cavities separated by partitions. These cavities allow a certain degree of fluid exchange between them for noise reduction via connecting openings in the partitions. Thus, the actual resonator is only formed when the filter system is assembled with the two matching resonator structures.

[0042] The two resonator structures can be sealed using a suitable sealing material, such as polyurethane (PUR), which is commonly used to manufacture the end plate of such a filter element by foaming PUR foam onto the base of the filter element. This method provides a simple and reliable seal without requiring any additional manufacturing steps.

[0043] Such a shunt resonator can be implemented in a very limited installation space and can be manufactured cost-effectively.

[0044] According to a further aspect of the invention, a filter element for use in a filter system is proposed, comprising a hollow cylindrical filter bellows arranged about its longitudinal axis. The filter element is closed at a first end face, and this first end face has at least one first end disk opposite a second end disk with a fluid passage for the filtered fluid. The filter element according to the invention allows for the advantageous use of a resonator in the filter system to achieve effective noise reduction of the flowing fluid within the filter system. This is particularly advantageous for use in an air intake system of an internal combustion engine, especially in a motor vehicle.

[0045] According to a further aspect of the invention, a secondary element for use in a filter system is proposed, comprising a hollow cylindrical filter bellows arranged around its longitudinal axis, the secondary element having an end plate at one end face. With the secondary element according to the invention, the advantageous use of a resonator in the filter system is possible in order to achieve effective noise reduction of the flowing fluid in the filter system. This is particularly advantageous in an application in an air intake system of an internal combustion engine, especially in a motor vehicle. Brief description of the drawings

[0046] Further advantages become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0047] They show, for example: Fig. 1 an isometric representation of a filter system according to an embodiment of the invention; Fig. 2 a longitudinal section through a filter system according to an embodiment of the invention with a resonator, one open end of which is closed by a first end disk of the filter element; Fig. 3 an enlarged view of the area of ​​the first end disk of the filter system Fig. 2; Fig. 4. A close-up of the area of ​​the end plate after Fig. 3; Fig. 5 a longitudinal section through a filter system according to a further embodiment of the invention with resonator, wherein the resonator extends through an opening of an end disk of a secondary element and its open end is closed by a first end disk of the filter element; Fig. 6 an enlarged view of the area of ​​the first end disk of the filter system Fig. 5; Fig. 7. A close-up of the area of ​​the end plate after Fig. 6; Fig. 8 a longitudinal section through a filter system according to a further embodiment of the invention with a resonator, one open end of which is closed by an end disk of a secondary element; Fig. 9 a close-up of the area of ​​the end disc of the filter system according to Fig. 8; Fig. 10 a section enlargement of a filter system with resonator according to a further embodiment of the invention, wherein the open end of the resonator is closed by a sock element of a secondary element; Fig. 11 a section enlargement of a filter system with resonator according to a further embodiment of the invention, wherein the open end of the resonator is closed by a sock element of a secondary element with an O-ring seal; Fig. 12 a longitudinal section through a filter element according to a further embodiment of the invention with resonator, one open end of which is closed by a bottom of a central tube; Fig. 13 an exploded view of the filter element according to Fig. 12; Fig. 14 a longitudinal isometric view of the central tube with resonator according to Fig. 12; Fig. 15 a longitudinally sectioned isometric representation of a filter element according to a further embodiment of the invention with resonator, one open end of which is closed by a bottom of a central tube and which is connected to the central tube by a snap connection; Fig. 16 an exploded view of the filter element and the resonator according to Fig. 15; Fig. 17 a close-up of the filter element after Fig. 15 in the area of ​​the rest stop; Fig. 18 a longitudinal section through a filter system according to a further embodiment of the invention with resonator, one open end of which is closed by a bottom of a secondary element; Fig. 19 a longitudinal section through a filter system according to a further embodiment of the invention with resonator, one open end of which is closed by a bottom of a secondary element and which is connected to the secondary element by a snap connection; Fig. 20 a close-up of the filter system after Fig. 19 in the area of ​​the rest stop; Fig. 21 a longitudinal isometric view of the secondary element with resonator according to Fig. 19; Fig. 22 a longitudinally sectioned isometric representation of a filter system according to a further embodiment of the invention with a resonator which is passed through an end disk 66 of a secondary element 60 and whose open end is connected to a coupling piece arranged on a first end disk of a filter element; Fig. 23 a longitudinal exploded view of the filter element with resonator according to Fig. 22; Fig. 24 a close-up of the coupling area of ​​the resonator according to Fig. 22; Fig. 25 Another embodiment of a filter system with an additional shunt resonator with an isometric view of a resonator structure on the filter element side; and Fig. 26 an isometric view of the filter system with the filter package from Fig. 25 showing an inside view of the lower part of the housing with a housing-side resonator structure. Embodiments of the invention

[0048] In the figures, identical or similar components are numbered with the same reference symbols. The figures merely show examples and are not to be understood as limiting.

[0049] The directional terminology used below, including terms like "left," "right," "above," "below," "in front," "behind," "after," and the like, serves only to improve the understanding of the figures and is in no way intended to limit their generality. The components and elements depicted, their interpretation, and their use may vary according to the considerations of a person skilled in the art and be adapted to the specific applications.

[0050] Fig. Figure 1 shows an isometric representation of a filter system 100 according to an embodiment of the invention, while in Fig. 2 a longitudinal section through a filter system 100 according to an embodiment of the invention with resonator 40, one of whose open end 42 is closed by a first end disk 14 of the filter element 10. Fig. Figure 3 shows an enlarged view of the area of ​​the first end disk 14 of the filter system 100. Fig. 2. In Fig. Figure 4 is a close-up of area X of end disk 14. Fig. 3 recognizable.

[0051] The filter system 100 for filtering a fluid, in particular an air intake system of an internal combustion engine, especially of a motor vehicle, comprises a filter housing 110 with a housing upper part 112 and a housing lower part 114, which extend along a housing axis M. The two housing parts 112, 114 are connected by connecting elements 118, for example by clips, so that, in order to change the filter element 10, the filter housing 110 can be easily opened, the housing lower part 114 removed, and the filter element 10 taken out of the housing upper part 112.

[0052] The filter system 100 further comprises a filter assembly 1, which fluid-tightly separates a clean fluid side 52 and a raw fluid side 50. The filter assembly 1 includes a filter element 10, wherein the filter element 10 comprises a hollow cylindrical filter bellows 12 arranged about its longitudinal axis L, which has a closed circumferential wall extending axially along the longitudinal axis L and surrounding an interior 30 of the filter bellows 12. The filter element 10 has a first end plate 14 on a first end face 26, which is opposite a second end plate 16 on a second end face 28, which has a fluid passage 29 for the filtered fluid. The cross-section of the filter bellows 12 can be circular, rectangular, triangular, polygonal, oval, or the like and can be advantageously adapted to the available installation space.

[0053] In this embodiment, the end disc 14 represents a combination of a PUR end disc and a plastic base 31 of the central tube 30 integrated into the PUR end disc.

[0054] The filter element 10 has, for example, a central tube 30 arranged concentrically inside the filter bellows 12, which supports the filter bellows 12 against the pressure of the fluid flowing radially from the outside to the inside.

[0055] The first end disk 14 has individual support elements 36 with which the filter element 10 can rest on the lower housing part 114 of a filter housing 110. The second end disk 16 has a support structure 34 designed as a circular bead with which the filter element 10 can be supported on the upper housing part 112.

[0056] The upper part of the housing 112 has a lateral fluid inlet 102 through which the fluid, for example air, can flow into the filter housing 110, through the filter element 10 from the radially outer raw fluid side 50 to the inner clean fluid side 52 and can leave the filter housing 110 filtered through a top fluid outlet 104.

[0057] The filter system 100 has a resonator 40 with a resonator body 41 having two opposing open ends 42, 43. The resonator 40 is arranged, for example, concentrically to the longitudinal axis L of the filter element 10 inside the filter assembly 1.

[0058] The resonator 40 is designed as a tube that widens conically towards the open end 43.

[0059] An open end 42 of the resonator 40 is closed by a bottom element 17 that at least partially closes the end face of the filter assembly 1. In this embodiment, the bottom element 17 is designed as an end plate 14, to which the open end 42 of the resonator 40 is connected. In particular, the resonator 40 can be screwed to the end plate 14.

[0060] The resonator 40 and the filter assembly 1, designed in this example as a filter element 10, are connected to each other by a sealing device 22. The sealing device 22 can, for example, be designed as a 2K seal 23 encompassing an outer circumference of the resonator 40, or as a PUR seal 24, or as an O-ring seal 25 (not shown).

[0061] As can be seen particularly in the enlarged illustrations in the Fig. 3 and Fig. As can be seen in Figure 4, the sealing device in this embodiment is designed as a two-component (2K) seal 23. The resonator body 41 rests with its open end 42 on the first end disk 14 of the filter element 10 and is supported on its circumference from the outside by a corresponding circumferential collar 18 formed on the end disk 14. The two-component (2K) seal 23 of the sealing device 22 is arranged between the collar 18 and the resonator body 41. The two-component (2K) seal 23 is advantageously injection-molded onto the collar 18, or the end disk 14, and has several sealing lips that bear against the resonator body 41. This effectively seals the open end 42 of the resonator body 41, allowing the resonator 40 to advantageously fulfill its acoustic damping function.

[0062] Fig. Figure 5 shows a longitudinal section through a filter system 100 according to a further embodiment of the invention with resonator 40, wherein the resonator 40 extends through an opening 70 of an end disk 66 of a secondary element 60 and its open end 42 is closed by a first end disk 14 of the filter element 10.

[0063] The filter assembly 1 comprises a secondary element 60 with a hollow cylindrical filter bellows 62 arranged around its longitudinal axis N, which is, for example, arranged concentrically to the housing axis M within the central tube 30 of the filter element 10. The secondary element 60 has an end plate 66 on one end face 68. The secondary element 60 further comprises a support structure 64 arranged inside the filter bellows 62, which supports the filter bellows 62 against forces of the fluid flowing through the filter bellows 62.

[0064] The secondary element 60 is screwed to the upper housing part 112 via an internal screw connection 80 and serves, for example, to protect the clean fluid outlet 104 and the rest of the fluid path from contamination when the filter element 10 is replaced. Furthermore, the secondary element 60 can also take over at least part of the filtration in the event of a failure of the filter bellows 12 of the filter element 10, thus also protecting the clean fluid outlet 104 and the rest of the fluid path from contamination.

[0065] The secondary element 60 is open at the upper end, which is directed towards the clean fluid outlet 104, and has an end disk 66 on one end face 68 at its opposite end 74.

[0066] The resonator body 41 of the in Fig. In the embodiment shown in Figure 5, the resonator body 41 extends through the opening 70 of the end disk 66 of the secondary element 60 and is sealed against the end disk 66. At its open end 42, the resonator body 41 is sealed against the first end disk 14 of the filter element 10 as in the embodiment shown in Figure 5. Fig. 2, Fig. 3 to Fig. 4. The embodiment shown is closed and sealed.

[0067] Fig. Figure 6 shows an enlarged view of the area of ​​the first end disk 14 of the filter system 100. Fig. 5, while in Fig. 7 a close-up of the area of ​​the end disk 14 after Fig. Figure 6 is shown. In this embodiment, the end disc 14 represents a combination of a PUR end disc and a plastic base 31 of the central tube 30 integrated into the PUR end disc.

[0068] The opening 70 formed in the end disk 66 of the secondary element 60 is fitted with a PUR seal 73 as a sealing device 22, which is injection-molded onto the structure of the end disk 66, which is connected to the support structure 64. When the resonator 40 is inserted, the PUR seal 73 lies tightly against the resonator body 41.

[0069] Fig. Figure 8 shows a longitudinal section through a filter system 100 according to a further embodiment of the invention with resonator 40, one of whose open end 42 is closed by an end disk 66 of a secondary element 60.

[0070] The filter assembly 1 within the central tube 30 has a secondary element 60 with a hollow cylindrical filter bellows 62 arranged around its longitudinal axis N, which is, for example, arranged concentrically to the housing axis M of the filter element 10. An open end 42 of the resonator 40 is closed by the end disk 66 of the secondary element 60.

[0071] Fig. Figure 9 shows a close-up of the area of ​​the end disk 66 of the secondary element 60. Fig. 8.

[0072] The open end 42 of the resonator 40 rests on the end disk 66 of the secondary element 60 and is centrally fixed by a collar 71 formed on the end disk 66. A two-component seal 72 is arranged between the collar 71 and the resonator body 41 as a sealing device 22, which is expediently injection-molded onto the collar 71 or the end disk 66. The two-component seal 72 lies tightly against the resonator body 41 and thus reliably seals the open end 42.

[0073] In Fig. Figure 10 shows a section enlargement of a filter system 100 with resonator 40 according to a further embodiment of the invention, wherein the open end 42 of the resonator 40 is closed by a sock element 82 of a secondary element 60.

[0074] The sock element 82, as secondary element 60, tightly encloses the open end 42 of the resonator 40 with its end disk 66. The sock element 82 can, for example, be designed as a tight-fitting plastic cover.

[0075] The sock element 82 comprises the end disc 66 and the filter bellows 62 of the secondary element 60. The support structure 64 is either fixed to the housing or can be clipped into the filter housing 110, for example as a replaceable part. The sock element 82, with its filter bellows 62 attached to the end disc 66, is placed over the support structure 64 and fastened either permanently or releasably, for example by means of a snap-fit ​​or screw connection or the like.

[0076] The secondary element 60 seals against the support structure 64 of the central tube via the expansion of the filter bellows 62.

[0077] A sealing device 22 is located on the end disk 66 of the sock element 82, which seals the open end 42 of the resonator 40.

[0078] The sealing device 22 is arranged in the end disk 66 of the sock element 82. In the case of the Fig. In the embodiment shown in Figure 10, a 2K seal 72 is arranged between a collar 71 and the resonator body 41, so that the open end 42 of the resonator body 41 can be reliably sealed.

[0079] Fig. Figure 11 shows a close-up of a filter system 100 with resonator 40 according to a further embodiment of the invention, wherein the open end 42 of the resonator 40 is closed by a sock element 82 of a secondary element 60 with an O-ring seal 74. The O-ring seal 74 is arranged on an inner surface of the resonator body 41 at the point where the resonator body 41 meets the sock element. This ensures that the open end 42 of the resonator 40 is reliably sealed.

[0080] In Fig. Figure 12 shows a longitudinal section through a filter element 10 according to a further embodiment of the invention with resonator 40, one open end 42 of which is closed by a bottom 31 of a central tube 30. Fig. Figure 13 is an exploded view of the filter element according to Fig. 12 shown, while Fig. 14 a longitudinal isometric view of the central tube with resonator according to Fig. 12 represents.

[0081] The first end disk 14 of the filter element 10 has individual support elements 36, with which the filter element 10 can rest on the lower housing part 114 of a filter housing 110. The second end disk 16 has a support structure 34 designed as a circular bead, with which the filter element 10 can be supported on the upper housing part 112.

[0082] The filter element 10 of the filter package 1 comprises a central tube 30 arranged inside the filter bellows 12, wherein the bottom element 17 is designed as the bottom 31 of the central tube 30. The bottom element 17 can, for example, be formed integrally with the resonator 40. As shown in particular in Fig. As can be seen in Figure 14, the resonator 40 has several stiffening elements 38 which extend radially from the resonator body 41 to the central tube 30 and are connected to the central tube 30. This allows the resonator body to be stabilized against vibrations. The upwardly open end 43 of the resonator body 41 is serrated for acoustic reasons.

[0083] Fig. Figure 15 shows a longitudinal isometric section of a filter element 10 according to a further embodiment of the invention with a resonator 40, one open end 42 of which is closed by a base 31 of a central tube 30. In this embodiment, the resonator 40 is connected to the central tube 30 via a snap-fit ​​connection 44. Fig. Figure 16 is an exploded view of the filter element 10 and the resonator 40 according to Fig. 15 shown, while in Fig. 17 a close-up of the filter element after Fig. 15 is shown in the area of ​​rest connection 44.

[0084] As can be seen, the resonator 40, in its assembled state, is connected to the central tube 30 via the snap-fit ​​connection 44. The snap-fit ​​connection 44 comprises several resonator-side snap elements 84 arranged around the circumference of the resonator 40. These snap elements can engage with several complementary central tube-side snap elements 85 by rotating the resonator 40 about the longitudinal axis L of the filter element 10. Thus, the resonator 40 can be connected to the central tube 30 of the filter element 10 by rotating the resonator 40 inside the filter element 10 about the longitudinal axis L. The central tube-side snap elements 85 are firmly connected to the central tube 30 of the filter element 10. The stiffening elements 38 are supported on the radial inner side of the central tube 30.

[0085] Fig. Figure 18 shows a longitudinal section through a filter system 100 according to a further embodiment of the invention with resonator 40, one of whose open end 43 is closed by a bottom 66 of a secondary element 60.

[0086] The secondary element 60, located inside the filter element 10, has a height that is only approximately half the height of the filter element 10. The secondary element 60 is attached to the central tube 30 in the upper part of the filter housing 110 by means of a screw connection 80, at the level of the second end disk 16 of the filter element. The resonator extends beyond the secondary element 60 along its length and its open end 42 is directed towards the first end disk 14 of the filter element 10. The base element 17 of the resonator 40 is designed as the end disk 66 of the secondary element 60. The open end 43 of the resonator 40, facing away from the first end disk 14 of the filter element 10, is closed by the end disk 66.

[0087] Advantageously, the resonator 40 can be formed in one piece with the end disk 66 of the secondary element 60 or with a (not shown) support structure 64 of the secondary element 60.

[0088] In Fig. Figure 19 is a longitudinal section through a filter system 100 according to a further embodiment of the invention with resonator 40, one open end 42 of which is closed by a bottom 66 of a secondary element 60 and which is connected to the secondary element 60 by a snap connection 49.

[0089] Fig. Figure 20 shows a close-up of the filter system 100 after Fig. 19 in the area of ​​rest connection 49, while in Fig. Figure 21 shows a longitudinal isometric view of the secondary element 60 with resonator.

[0090] The resonator 40 is connected to the end disk 66, or the support structure 64 of the secondary element 60, via the snap-fit ​​connection 49. The snap-fit ​​connection 49 comprises several resonator-side snap elements 92 arranged around the circumference of the resonator 40, which can snap into place with several complementary support-structure-side snap elements 93 by rotating the resonator 40 about the longitudinal axis N of the secondary element 60. Thus, the resonator 40 can be connected to the support structure 64, or the end disk 66 of the secondary element 60, by placing the resonator 40 inside the secondary element 60 onto the end disk 66 and rotating it about the longitudinal axis N. In this embodiment, the base 66 of the resonator 40 is formed by the end disk 66 of the secondary element 60. The support structure-side locking elements 93 are firmly connected to the support structure 64 of the secondary element 60.

[0091] As in the Fig. 19, Fig. 20 to Fig. As shown in Figure 21, the resonator 40 is connected to the support structure 64 of the secondary element 60 via the snap-fit ​​connection 49. In an alternative embodiment, however, the resonator 40 can also be rigidly connected to the support structure 64, in particular integrally connected to the support structure 64.

[0092] In Fig. Figure 22 shows a longitudinally sectioned isometric representation of a filter system 100 according to a further embodiment of the invention with resonator 40, which is passed through an end disk 66 of a secondary element 60 and whose open end 42 is connected to a coupling piece 76 arranged on a first end disk 14 of a filter element 10. Fig. Figure 23 shows a longitudinal exploded view of the filter element 10 with resonator 40 according to Fig. 22, while in Fig. Figure 24 shows a close-up of the coupling area 78 of the resonator 40.

[0093] The resonator 40 extends through the end disk 66 of the secondary element 60. Part of the resonator body 41 is located inside the secondary element 60, while another part is located outside, in the direction of the first end disk 14 of the filter element 10, within the filter element 10. The resonator 40 is oriented along the longitudinal axis N of the secondary element 60. The open end 42 of the resonator 40, facing the first end disk 14 of the filter element 10, is fluid-tightly connected to the coupling piece 76 located on the first end disk 14.

[0094] The open end 42 of the resonator 40 has a coupling area 78 which circumferentially overlaps a sealing structure 79 arranged at the open end 83 of the coupling piece 76. This allows the resonator body 41 to be fluid-tightly connected to the coupling piece 76, and the open end 42 of the resonator body 41 is thus closed by the end disk 14 of the filter element 10 arranged at the lower end of the coupling piece 76. This enables the resonator 40 to advantageously fulfill its acoustic damping function.

[0095] Alternatively, the sealing structure 79 can also be arranged at the open end 42 of the resonator body 41 and the coupling area 78 at the open end 83 of the coupling piece 76.

[0096] The Fig. 25 and Fig. Figure 26 shows another embodiment of a filter system 100 with an additional shunt resonator outside the filter package 1. Fig. Figure 25 shows an isometric view of a filter element-side resonator structure 220 and Fig. 26 an isometric view of the filter system 100 with filter package 1 from Fig. 25 with a view of an inside 116 of the lower housing part 114 with a housing-side resonator structure 120.

[0097] Advantageously, the filter system 100 can incorporate additional measures for reducing noise emission on the closed side of the filter assembly 1. For example, a resonator structure 220 can be integrated into a base 31 of the filter assembly 1 as a shunt resonator. The base 31 can advantageously be designed as the base of a central tube 30 of the filter element 10, which supports the filter bellows 12 from the inside against the pressure of the flowing fluid. At least one element-side resonator structure 220 can be formed on the base 31 for noise attenuation of a flowing fluid. The element-side resonator structure 220 can have two grooves 222, 224 separated from each other by a partition 226, wherein at least one of the two grooves 222, 224 is connected to an interior space 230 of the filter assembly 1 via an opening 228.On an inner surface 116 of the lower housing part 114, a housing-side resonator structure 120, complementary to the element-side resonator structure 220, can be formed, which has two grooves 122, 124 separated from each other by a partition 126. During the intended assembly of the filter system 100, the element-side resonator structure 220 can form a tight seal with the housing-side resonator structure 120. The element-side and housing-side grooves 222, 224, 122, 124 can be fluidically connected to at least one of the two resonator structures 220, 120 via connecting openings 128 in at least one of the partitions 226, 126.

[0098] The housing-side resonator structure 120 can be formed on the inside 116 of the housing base 114 and can advantageously be designed as a mirror image complementary to the element-side resonator structure 220. When the filter element 10 is installed in the filter housing 110 and the filter housing 110 is closed with the housing base 114, the two resonator structures 220 and 120 interact and form two cavities separated by partitions 226 and 126. These cavities allow a certain amount of fluid exchange between them for noise damping via connecting openings 128 in the partitions 226 and 126. Thus, the actual resonator is only formed when the filter system 100 is assembled with the two matching resonator structures 220 and 120.

[0099] The sealing of the two resonator structures 220, 120 can be achieved via a sealing structure 234 with a suitable sealing material, for example polyurethane (PUR), which is typically used to manufacture an end plate 232 of such a filter element 10 by foaming PUR foam onto an end face 216 of the base 31 of the filter element 10. In this way, the seal can be achieved simply and reliably, and no additional manufacturing steps are required. Support elements 236 for supporting the filter element 10 on the inside 116 of the lower housing part 114 during assembly of the filter element 10 in the filter housing 110 can also be integrated into the end plate 232 thus formed. Reference sign 1 filter package 10 filter elements 12 filter bellows 14 first end disc 16 second end disc 17 floor element 18th Federal 22 Sealing device 23 2K seal 24 PUR seal 25 O-ring seals 26 first front 28 second front 29 Fluid passage 30 Center tube 31 Floor 34 Support structure 36 Support element 38 Stiffening element 40 Resonator 41 Resonator bodies 42 open end 43 open end 44 rest connection 49 Rest stop 50 Raw fluid area 52 Pure fluid area 60 Secondary element 62 filter bellows 64 Support structure 66 End disc 68 Front 70 Opening 71 Federal Government 72 2K seal 73 PUR seal 74 O-ring seal 75 End 76 coupling piece 78 Coupling area 79 Sealing structure 80 screw connection 82 sock element 83 open ending 84 locking element 85 locking element 92 locking elements 93 Latching element 100 filter system 102 Admission 104 Outlet 110 filter housings 112 Upper housing 114 Lower housing part 116 Inside 118 Connecting element 120 housing-side resonator structure 122 Nut 124 Nut 126 Partition wall 128 connecting openings Exit 130 134 Sealing structure 136 Ring groove 216 Front 220 Resonator structure 222 Nut 224 Nut 226 Partition wall 228 Opening 230 interior 232 End plate 234 Sealing structure 236 Support element L Longitudinal axis Filter element M Housing axis N Longitudinal axis Secondary element

Claims

[1] Filter system (100) for filtering a fluid, comprising at least - a filter housing (110) with at least one housing upper part (112) and one housing lower part (114) extending along a housing axis (M), - a filter package (1) that separates a clean fluid side (52) and a raw fluid side (50) in a fluid-tight manner, comprising at least one filter element (10), wherein the at least one filter element (10) comprises a hollow cylindrical filter bellows (12) arranged about its longitudinal axis (L), wherein the filter element (10) is closed at at least one first end face (26) and has a first end disk (14) which is opposite a second end disk (16) with a fluid passage (29) for the filtered fluid, - and a resonator (40) with a resonator body (41) having two opposing open ends (42, 43), wherein the resonator (40) is arranged inside the filter package (1), and wherein an open end (42, 43) of the resonator (40) is closed by a bottom element (17) that closes the filter package (1) at least partially at its end face, wherein the filter package (1) comprises a central tube (30) arranged inside the filter bellows (12), wherein the bottom element (17) is designed as the bottom (31) of the central tube (30) which is firmly connected to the resonator (40), and wherein the resonator (40) is connected to the central tube (30) via a snap connection (44). [2] Filter system according to claim 1, wherein the resonator (40) and the filter package (1) are adjacent to each other via a sealing device (22). [3] Filter system according to claim 1 or 2, wherein the sealing device (22) is designed as a 2K seal (23, 72) encompassing an outer circumference of the resonator (40) or a PUR seal (24, 73) or as an O-ring seal (25, 74) or as a labyrinth seal, or that the sealing device (22) is designed as a 2K seal (23, 72) abutting an inner circumference of the resonator (40) or a PUR seal (24, 73) or as an O-ring seal (25, 74) or as a labyrinth seal. [4] Filter system according to one of the preceding claims, wherein the bottom element (17) is designed as an end disk (14) with which the open end (42) of the resonator (40) is connected, in particular with which the open end (42) of the resonator (40) is screwed, clipped, glued or connected with a bayonet connection. [5] Filter system according to one of the preceding claims, wherein the bottom element (17) is formed as the bottom (31) of the central tube (30) in one piece with the resonator (40). [6] Filter system according to claim 1 or 5, wherein the filter package (1) has within the central tube (30) a secondary element (60) with a hollow cylindrical filter bellows (62) arranged about its longitudinal axis (N) and which is arranged about the housing axis (M), wherein an open end (42, 43) of the resonator (40) is closed by the end disk (14, 66) of the filter package (1). [7] Filter system according to claim 6, wherein the secondary element (60) is designed as a sock element (82) whose end disk (66) tightly surrounds the open end (42) of the resonator (40). [8] Filter system according to claim 7, wherein the sealing device (22) is arranged in the end disk (66) of the sock element (82). [9] Filter system according to claims 6 to 8, wherein the bottom element (17) is designed as an end disk (66) of the secondary element (60), and wherein an open end (43) of the resonator (40) facing away from the first end disk (14) of the filter element (10) is closed by the end disk (66). [10] Filter system according to one of claims 6 to 9, wherein the resonator (40) is connected to a support structure (64) of the secondary element (60), in particular in one piece. [11] Filter system according to claims 6 to 10, wherein the resonator (40) is connected to the end disk (66) and / or the support structure (64) of the secondary element (60) via a snap connection (49). [12] Filter system according to one of claims 6 to 11, wherein the resonator (40) is passed through the end disk (66) of the secondary element (60), wherein an open end (42) of the resonator (40) facing the first end disk (14) of the filter element (10) is fluid-tightly connected to a coupling piece (76) arranged on the first end disk (14). [13] Filter system according to claim 12, wherein the open end (42) of the resonator (40) or the coupling piece (76) has a coupling area (78), wherein the other of the two coupling partners has a sealing structure (79) which the coupling area (78) overlaps circumferentially. [14] Filter element (10) for use in a filter system (100) according to one of claims 1 to 13, with a hollow cylindrical filter bellows (12) arranged about its longitudinal axis (L), wherein the filter element (10) is closed at a first end face (26) and the first end face (26) has at least one first end disk (14) which is opposite a second end disk (16) with a fluid passage (29) for the filtered fluid. [15] Secondary element (60) for use in a filter system (100) according to one of claims 1 to 13, comprising a hollow cylindrical filter bellows (62) arranged about its longitudinal axis (N), wherein the secondary element (60) has an end disk (66) at an end face (68).

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