EP4337851A1

EP4337851A1 - Filter system comprising a resonator

Info

Publication number: EP4337851A1
Application number: EP22727068.3A
Authority: EP
Inventors: Daniel Schmid; Kevin Kohn; Sven Epli
Original assignee: Mann and Hummel GmbH
Current assignee: Mann and Hummel GmbH
Priority date: 2021-05-10
Filing date: 2022-05-02
Publication date: 2024-03-20
Also published as: WO2022238159A1; US20240075418A1; CN117295889A; DE102021112125A1

Abstract

The invention relates to a filter system (100) for filtering a fluid, said filter system at least comprising: a filter housing (110) having at least one housing upper part (112) and one housing lower part (114) which extend along a housing axis (M); a filter pack (1) which separates a purified fluid side (52) and a raw fluid side (50) and comprises at least one filter element (10), the at least one filter element (10) comprising a hollow-cylindrical filter bellows (12) arranged around the longitudinal axis (L) of said filter element, the filter element (10) being substantially sealed at least at a first end face (26) and having a first end disc (14) which is opposite a second end disc (16) that has a fluid passage (29) for the filtered fluid; and a resonator (40) having an end sealed by a base (42). Figure 2

Description

description

Filter system with a resonator

technical field

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 duct system of an internal combustion engine, in particular a motor vehicle.

State of the art

An air filter arrangement for an engine is known from US 2014/102304 A1, which includes a filter element, a sound-damping element and an end cap. The filter element is a cylindrical filter element that defines a hollow interior. The sound attenuation element extends into the hollow interior of the cylindrical filter element. The sound attenuation element has a flange at a first end. The flange has a diameter larger than a 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 muffler acts to reduce engine noise that travels through the air cleaner assembly.

Disclosure of Invention

An object of the invention is to create a filter system for filtering a fluid with a resonator, which enables improved noise damping.

A further object is the provision of a filter element for such a filter system, which enables improved noise damping.

A further object is the provision of a secondary element for such a filter system which enables improved noise damping.

According to one aspect of the invention, the aforementioned object is achieved by a filter system for filtering a fluid, at least comprising a filter housing with at least 2 a housing upper part and a housing lower part, which extend along a housing axis, a filter package that 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 around its longitudinal axis, wherein the filter element is attached to at least a first The end face is essentially closed and has a first end plate, which is opposite a second end plate with a fluid passage for the filtered fluid, and a resonator with one end closed by a bottom, the resonator inside the filter pack with its bottom facing the first End plate of the filter element is arranged directed.

The further object is achieved 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 designed to be essentially closed on a first end face and the first end face has at least one first end disk, which has a second end disk with facing a fluid passage for the filtered fluid.

The further object is achieved by a secondary element for use in a filter system, with a hollow-cylindrical filter bellows arranged around its longitudinal axis, the secondary element having an end disk on one end face.

Favorable configurations and advantages of the invention result from the further claims, the description and the drawing.

According to one aspect of the invention, a filter system for filtering a fluid is proposed, at least comprising a filter housing with at least one upper housing part and one lower housing part, which extend along a housing axis, a filter package which separates a clean fluid side and a raw fluid side in a fluid-tight manner, comprising at least one filter element , wherein the at least one filter element comprises a filter bellows arranged in the form of a hollow cylinder around its longitudinal axis, and wherein the filter element is designed to be essentially closed on at least one first end face and has a first end plate which has a second end plate 3 faces a fluid passage for the filtered fluid, and a resonator with one end closed by a bottom. In this case, the resonator is arranged in the interior of the filter pack with its bottom directed towards the first end plate of the filter element.

The filter system, which is designed to filter a fluid, in particular an air duct system of an internal combustion engine, in particular a motor vehicle, advantageously has a resonator for noise damping of the flowing fluid when it flows through the filter element of the filter system. The resonator can be arranged as part of the filter housing, firmly connected to it, for example welded, or exchangeable, for example clipped or screwed, on the clean fluid side of the filter system.

For acoustic reasons, the resonator can advantageously be designed as a tube that is open on one side and closed with a bottom on the other side. The resonator is arranged inside the filter pack such that its bottom faces the first end plate of the filter pack. In particular, the resonator can expediently be arranged concentrically to the housing axis in order to bring about an advantageous acoustic damping of the filter system.

The filter pack can, for example, comprise a filter element which is open on both sides along its longitudinal axis, with one side of the filter element sealing off from the filter housing.

The hollow-cylindrical filter bellows has a closed peripheral wall that surrounds a longitudinal axis and can have any cross section. The cross section of the filter bellows can be circular, rectangular, triangular, polygonal, oval or the like and can be conveniently adapted to an existing installation space. The filter bladder may comprise pleated filter media or wrapped layers of filter media. A combination of folded and wound filter media is also possible.

In one exemplary embodiment, the second open side of the filter element can be sealed off from the resonator tube. The seal can be made as a two-component (2K) - 4

Seal, as a polyurethane (PUR) - seal, as an O-ring or plastic-plastic seal, or be designed as a labyrinth seal. The seal can be arranged on the filter element, for example on a central tube or on an end plate or on the resonator.

The filter pack can also have a secondary element, which is arranged as a safety element inside the filter element and which also seals the filter housing. When changing the filter element, the secondary element serves to prevent raw fluid from reaching the clean fluid side and thus the clean fluid outlet. The secondary element can be designed, for example, as a so-called sock element, which is sealed with a tight plastic cover at the end that is not sealed against the filter housing. Alternatively, the secondary element can also be designed as a screwed safety element that is open at the bottom and is then sealed by the resonator. In the case of the sock element, a support structure of the secondary element for supporting the filter bellows can be part of the housing or can be clipped, welded or screwed in as a separate component.

The secondary element can be sealed off from the resonator by a sealing device on the open end plate. The seal can be designed, for example, as a 2K seal, as a PUR seal, as an O-ring seal or as a plastic-plastic seal, or as a labyrinth seal. The seal can be arranged on the end plate of the secondary element or on the resonator.

Such a resonator can be accommodated in a filter system in a space-saving manner and can be produced inexpensively.

According to an advantageous configuration of the filter system, the resonator and the filter pack can adjoin one another via a sealing device. The resonator can advantageously be sealed against the filter element or a secondary element, for example on an open end plate. In this way, the resonator can seal the filter element and/or the secondary element at the open end disk. The seal can, for example, be a 2-component seal, a PUR seal, an O-ring 5

Seal or as a plastic-plastic seal, or as a labyrinth seal, be designed. The seal can be arranged on the end plate of the secondary element or filter element or on the resonator.

According to a favorable configuration of the filter system, the filter pack can include a central tube arranged inside the filter bellows, with the base of the resonator being integrated into a base of the central tube of the filter pack. In this way, the resonator can be manufactured cheaply and stably fixed in the filter pack. The assembly of the resonator can also be simplified in this way.

According to a favorable embodiment of the filter system, an open end of the resonator opposite the bottom can be fastened in the area of the second end plate. As a result, the resonator can be mounted in a favorable manner on the filter element, for example on the end plate or on a secondary element, and can also be easily removed when changing the filter element and mounted in another filter element. In this way, the resonator, which is subject to little wear, can be cheaply reused.

According to a favorable embodiment of the filter system, the first end plate can have an opening through which the resonator partially extends, the opening of the end plate closing off the resonator. In particular in the case of a concentric arrangement of the resonator, the opening can be formed centrally in the end disk. The resonator seals the filter element in this way. When changing the filter element, the resonator can advantageously remain mounted on the filter housing and does not have to be changed with the filter element.

The opening of the end plate to the resonator can be fluid-tight. However, a purely acoustic seal can be sufficient if the sealing point is on the clean side of the filter element, in particular the flap element.

According to a favorable configuration of the filter system, the first end plate can have a sealing structure surrounding the opening as a sealing device, in particular a PUR seal or an O-ring seal or a 2-component seal, or a labyrinth 6

have a seal. As a result, the raw fluid side can advantageously be sealed off from the clean fluid side of the filter system. The sealing structure can be arranged on the end plate since the resonator can be manufactured cheaply in this way. Alternatively, however, the sealing structure can also be arranged on the resonator.

According to an advantageous embodiment of the filter system, the resonator can be connected to the central tube via a snap-in connection. In this way, the resonator can be inserted into the filter element in a simple manner and can also be removed when the filter element is changed. As a result, the resonator can be reused in a favorable manner, since it is essentially not subject to wear.

According to a favorable embodiment of the filter system, the resonator can be connected to an end of the central tube that is opposite the first end face of the filter element. In particular, the resonator can be connected via a latching connection. In particular, the resonator can be arranged so that it can be changed from the clean fluid side. As a result, the resonator can be mounted on the filter element in a favorable manner and can also be easily removed when changing the filter element and mounted in another filter element. In this way, the resonator, which is subject to little wear, can be cheaply reused.

According to a favorable embodiment of the filter system, the resonator can be pushed into the opening of the end plate from the first end face of the filter element. In particular, the resonator can be connected to the end plate via a latching connection. In this way, the resonator can be easily installed and removed again if necessary. A seal between the resonator and the end plate of the filter element can be conveniently arranged on the end plate. A circumferential PUR seal or an O-ring seal or a 2-component seal or a labyrinth seal can expediently be used as the sealing device. In this way, secure sealing is advantageously possible even when the resonator is changed, since the seal is also replaced with each change of the filter element.

According to a favorable embodiment of the filter system, the filter pack can also have a secondary element with a hollow-cylindrical element arranged around its longitudinal axis 7

Include filter bellows, which, in particular concentrically to the housing axis, is arranged within the central tube of the filter element. The resonator can be arranged at least in regions, in particular concentrically to the longitudinal axis, inside the secondary element with the closed end directed towards the first end plate of the filter element.

The filter pack can have a secondary element, which is arranged as a safety element inside the filter element and which also seals the filter housing. When changing the filter element, the secondary element serves to prevent raw fluid from reaching the clean fluid side and thus the clean fluid outlet. The secondary element can be designed, for example, as a so-called sock element, which is sealed with a tight plastic cover at the end that is not sealed against the filter housing. Alternatively, the secondary element can also be designed as a screwed safety element that is open at the bottom and is then sealed by the resonator. In the case of the sock element, the central tube can be part of the housing or clipped in, welded, glued or screwed in as a separate component.

According to a favorable embodiment of the filter system, the secondary element can have an end disk with an opening through which the resonator partially extends, the opening of the end disk sealingly sealing the resonator. In this way, the resonator can properly seal the secondary element. As a result, the resonator can remain mounted on the filter housing when the secondary element is changed and does not have to be removed and/or changed at the same time.

According to a favorable embodiment of the filter system, the end plate can have a sealing structure surrounding the opening, in particular a 2K seal or a PUR seal or an O-ring seal or a labyrinth seal. The secondary element can be sealed off from the resonator by a sealing device on the open end disk. The seal can be designed, for example, as a 2K seal, as a PUR seal, as an O-ring seal or as a plastic-plastic seal, or as a labyrinth seal. The seal can be arranged on the end plate of the secondary element or alternatively on the resonator. According to an advantageous configuration of the filter system, the resonator can be connected to a support structure of the secondary element, in particular can be connected in one piece. In this way, the resonator can be manufactured cheaply and stably fixed in the secondary element. The assembly of the resonator can also be simplified in this way, since the resonator can be inserted into the filter housing together with the secondary element.

According to a favorable embodiment of the filter system, the resonator can be connected to the end plate of the secondary element via a snap-in connection. In this way, the resonator can be inserted into the secondary element in a simple manner and can also be removed when the secondary element is changed. As a result, the resonator can be reused in a favorable manner, since it is essentially not subject to wear

According to a favorable embodiment of the filter system, the resonator can be pushed into the opening of the end plate from the end face of the secondary element. In particular, the resonator can be connected to the end plate via a latching connection. In this way, the resonator can be easily installed and removed again if necessary. A seal between the resonator and the end plate of the secondary element can be conveniently arranged on the end plate. A circumferential PUR seal or an O-ring seal or a 2-component seal or a labyrinth seal can expediently be used as the sealing device. A secure seal is thus advantageously possible even when the resonator is changed.

According to a favorable configuration of the filter system, the resonator can be connected to an end of the support structure of the secondary element opposite the first end face of the filter element, in particular connected via a latching connection. In particular, the resonator can be arranged so that it can be changed from a clean fluid side. As a result, the resonator can be mounted on the secondary element in a favorable manner and can also be easily removed when changing the secondary element and mounted in another secondary element. To this 9

Way, the resonator, which is subject to little wear, can be reused favorably.

The filter system can advantageously have additional measures for reducing noise emissions on the closed side of the filter pack. In addition, a resonator structure can be integrated into the bottom of the filter pack as a shunt resonator. At least one element-side resonator structure for noise damping of a flowing fluid can be formed on the base. The element-side resonator structure can have two grooves that are separated from one another by a partition wall, with at least one of the two grooves being connected to an interior space of the filter pack via an opening. A housing-side resonator structure which is complementary to the element-side resonator structure and has two grooves separated from one another by a partition wall can be formed on an inner side of the housing lower part. When the filter system is assembled as intended, the element-side resonator structure can seal tightly 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 connection openings in at least one of the partition walls.

The housing-side resonator structure can be formed on the inside of the housing lower part and can expediently be formed 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 part, the two resonator structures interact and form two flea chambers separated by partition walls, which enable a certain fluid exchange with one another via connecting openings in the partition walls for noise dampening. The actual resonator is only formed when the filter system is assembled with the two matching resonator structures.

The two resonator structures can be sealed using a suitable sealing material, for example polyurethane (PUR), which is usually used to manufacture an end plate of such a filter element by foaming PUR foam onto the bottom of the filter element. This way the waterproofing can be easy 10 and reliably achieved, and no additional manufacturing steps are required.

Such a shunt resonator can be implemented in a very limited space and can be produced inexpensively.

According to a further aspect of the invention, a filter element is proposed for use in a filter system, with a hollow-cylindrical filter bellows arranged around its longitudinal axis, the filter element being at least essentially closed on a first end face and the first end face having at least one first end disk which opposed to a second end disk having a fluid passage for the filtered fluid. With the filter element according to the invention, an advantageous use of a resonator in the filter system is possible in order to achieve effective noise damping of the flowing fluid in the filter system. This is particularly advantageous when used in an air duct system of an internal combustion engine, in particular in a motor vehicle.

On its first end face, the filter element can have an end disk with an opening which, as described above, can be sealed by a resonator. In an alternative embodiment, however, the end plate can also be closed and the resonator can be arranged inside the filter element.

The end plate can be made entirely of PUR, for example. In alternative embodiments, however, the end cap can also be designed as a plastic end cap, as a bonded metal end cap or as a combination of an end cap made of PUR and plastic.

According to a further aspect of the invention, a secondary element is proposed for use in a filter system, with a hollow-cylindrical filter bellows arranged around its longitudinal axis, with the secondary element having an end disk on one end face. With the secondary element according to the invention, an advantageous use of a resonator in the filter system is possible in order to achieve effective noise damping of the flowing fluid in the filter system. This is 11 particularly advantageous when used in an air duct system of an internal combustion engine, in particular in a motor vehicle.

Brief description of the drawings

Further advantages result from the following description of the drawings. Exemplary embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into further meaningful combinations.

Examples show:

Fig. 1 is an isometric view of a filter system according to a

embodiment of the invention;

2 shows a longitudinal section through a filter system according to an exemplary embodiment of the invention with a resonator which closes an open end plate of a secondary element of a filter pack;

FIG. 3 shows an enlarged longitudinal section of the filter system according to FIG. 2 in the area of the end plates of the filter pack;

FIG. 4 shows an enlarged detail from FIG. 3; FIG.

5 shows an enlarged longitudinal section of the filter system according to FIG. 2 in the area of the end plates of the filter pack with a sealing device according to a further exemplary embodiment;

FIG. 6 shows an enlarged detail from FIG. 5; FIG.

7 shows a longitudinal section through a filter system according to a further exemplary embodiment of the invention with a resonator which closes an open end plate of a filter element of a filter pack; 12

FIG. 8 shows an enlarged detail from FIG. 7 in the region of the end plate of the filter element;

FIG. 9 shows an enlarged detail from FIG. 7 in the area of the end disk of the filter element with a sealing device according to a further exemplary embodiment;

10 shows a longitudinal section through a filter system according to a further exemplary embodiment of the invention with a resonator which closes the open end plates of a filter element and a secondary element of a filter pack;

FIG. 11 shows an enlarged detail from FIG. 10 in the area of the end plates of the filter pack;

FIG. 12 shows an enlarged detail from FIG. 10 in the area of the end plates of the filter pack with a sealing device according to a further exemplary embodiment;

13 shows a longitudinal section through a filter element with a resonator according to a further exemplary embodiment, in which the resonator is designed as part of the central tube of the filter element;

FIG. 14 shows the central tube with an integrated resonator according to the exemplary embodiment from FIG. 13 in a longitudinally sectioned isometric representation;

15 shows a longitudinal section through a filter system with a resonator according to a further exemplary embodiment, in which the resonator is designed as part of an end plate of a secondary element; 13

16 shows an exploded view of a filter system with a resonator according to a further exemplary embodiment, in which the resonator is formed as part of a support structure of a secondary element;

FIG. 17 is a longitudinal sectional isometric view of the filter system of FIG. 16;

FIG. 18 shows the secondary element of the filter system according to FIG. 17;

19 shows a longitudinal section through a filter system with a resonator according to a further exemplary embodiment, in which the resonator is connected to an end plate of a secondary element via a snap-in connection;

FIG. 20 shows an enlarged detail of the latching connection of the resonator according to the exemplary embodiment in FIG. 19 in an isometric representation;

FIG. 21 shows the secondary element of the filter system according to FIG. 19 in a longitudinally sectioned isometric view;

22 shows an exploded view of a filter system with a resonator according to a further exemplary embodiment, in which the resonator is connected to an end of the central tube which is opposite the first end face of the filter element;

Fig. 23 the filter element of the filter system according to Figure 22 with mounted

Isometric representation of the resonator;

FIG. 24 shows an enlarged detail of the latching connection of the resonator according to FIG. 23; 14

25 shows a longitudinal section through a filter system with a resonator according to a further exemplary embodiment, in which the resonator is pushed into an opening in an end plate of a secondary element;

FIG. 26 shows an enlarged detail of the latching connection of the resonator according to FIG. 25;

FIG. 27 shows an enlarged detail of a sealing structure of the resonator according to FIG. 25;

FIG. 28 shows a longitudinally sectioned isometric representation of the secondary element of the exemplary embodiment according to FIG. 25 in a plan view of the end disk;

FIG. 29 shows an isometric view of the latching connection of the resonator according to FIG. 28;

FIG. 30 shows an exploded view of the secondary element with resonator of the exemplary embodiment according to FIG. 25;

31 shows an isometric view of a filter element with a resonator according to a further exemplary embodiment, in which the resonator is pushed into an opening in an end plate of the filter element;

FIG. 32 shows the filter element according to FIG. 31 with a mounted resonator;

FIG. 33 shows an isometric representation of the latching connection of the resonator according to FIG. 31;

34 shows a longitudinally sectioned isometric representation of a filter system according to a further exemplary embodiment, in which the resonator is mounted on the secondary element and can be exchanged from a clean fluid side; 15

FIG. 35 shows an exploded view of the secondary element with resonator of the exemplary embodiment according to FIG. 34;

FIG. 36 shows an isometric view of the latching connection of the resonator according to FIG. 34;

37 shows a further exemplary embodiment of a filter system with an additional shunt resonator with an isometric view of a resonator structure on the filter element side; and

38 shows an isometric view of the filter system with the filter pack from FIG. 37 with a view of an inside of the lower housing part with a housing-side resonator structure.

Embodiments of the invention

In the figures, the same or similar components are denoted by the same reference symbols. The figures only show examples and are not to be understood as limiting.

Directional terminology used in the following with terms such as "left", "right", "above", "below", "in front of", "behind", "after" and the like only serves to improve understanding of the figures and is in no way intended to limit the represent generality. The components and elements shown, their design and use can vary according to the considerations of a person skilled in the art and can be adapted to the respective applications.

FIG. 1 shows an isometric representation of a filter system 100 according to an exemplary embodiment of the invention, while FIG. FIG. 3 shows an enlarged longitudinal section of the filter system according to FIG. 2 in the area of the end plates 14, 66 of the filter pack 1. FIG. 4 shows an enlarged detail from FIG. 16

The filter system 100 for filtering a fluid, in particular an air duct system of an internal combustion engine, in particular 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 via connecting elements 118, for example clipped, so that to change the filter element 10 the filter housing 110 can be opened slightly, the lower housing part 114 can be removed and the filter element 10 can be removed from the upper housing part 112.

The filter system 100 further comprises a filter pack 1 , which separates a clean fluid side 52 and a raw fluid side 50 in a fluid-tight manner. The filter pack 1 comprises a filter element 10, wherein the filter element 10 comprises a filter bellows 12 arranged in the form of a hollow cylinder around its longitudinal axis L. The filter element 10 has a first end disk 14 on a first end face 26 which is opposite a second end disk 16 on a second end face 28 which has a fluid passage 29 for the filtered fluid.

The filter element 10 has a central tube 30 which is arranged concentrically inside the filter bellows 12 and which supports the filter bellows 12 against the pressure of the fluid flowing radially from the outside inwards.

The filter pack 1 also includes a secondary element 60 with a hollow-cylindrical filter bellows 62 arranged about its longitudinal axis N, which is arranged inside the central tube 30 of the filter element 10 concentrically to the housing axis M, in particular in the exemplary embodiment shown. The secondary element 60 has a support structure 64 which is arranged inside the filter bellows 62 and supports the filter bellows 62 against forces of the fluid flowing through the filter bellows 62 .

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 further fluid tract from contamination when the filter element 10 is changed. In addition, the secondary element 60 can perform at least part of the filtering even if the filter bellows 12 of the filter element 10 fails 17 take over and thus also protect the clean fluid outlet 104 and the other fluid tract from contamination.

The secondary element 60 is designed to be open at the upper end directed toward the clean fluid outlet 104 and has an end disk 66 on an end face 68 at its opposite end 77 .

The upper housing part 112 has a lateral fluid inlet 102 through which the fluid, for example air, flows into the filter housing 110, through the filter element 10 and the secondary element 60 from the radially outer untreated fluid side 50 to the inner cleaned fluid side 52 and through a fluid outlet at the top 104 can leave the filter housing 110 filtered again.

The filter pack 1 further comprises a resonator 40 with one end closed by a bottom 42 . The resonator 40 is arranged in the interior of the filter pack 1 with its bottom 42 directed towards the first end plate 14 of the filter element 10 .

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

In the exemplary embodiment illustrated in FIGS. 1 to 4, the resonator 40 is arranged concentrically to the longitudinal axis N inside the secondary element 60 with the closed end 42 directed towards the first end plate 14 of the filter element 10 .

The resonator 40 and the filter pack 1 adjoin one another via a sealing device 22 . The open end 43 of the resonator 40 opposite the base 42 is fastened in the area of the second end plate 16, for example at the upper end of the support structure 64 of the secondary element 60.

The secondary element 60 has an end plate 66 with a central opening 70 through which the resonator 40 partially extends. The end plate 66 is with the 18

Supporting structure 64 of the secondary element 60 is connected and has, for example, a profiled disc with a central opening 70 that is foamed around with PUR.

The opening 70 of the end disk 66 closes tightly to the resonator 40 .

The sealing device 22, by means of which the resonator 40 is sealed against the end plate 66 of the secondary element 60, has a sealing structure 72 running around the opening 70, which can be used in particular as a 2K seal 73 or a PUR seal 75 or an O-ring Seal 76 or a labyrinth seal can be formed.

In the exemplary embodiment illustrated in FIGS. 2 to 4, the sealing structure 72 is designed as a 2K seal 73, as can be seen in particular from the enlarged section in FIG. The sealing structure 72 is injection molded onto the structural material of the end disk 66 and has a plurality of sealing lips resting against the resonator 40 .

In this exemplary embodiment, the resonator 40 seals the opening 70 of the end plate 66 against the interior space 33 of the filter element 10 . In this way, the clean fluid outlet 104 is effectively sealed from the environment by the secondary element 60 if the filter element 10 is removed during a change or the filter bellows 12 of the filter element 10 fails. The secondary element 60 can thus effectively fulfill its protective function.

In FIG. 5, in an enlarged longitudinal section of the filter system 100 according to FIG. The end disk 66 itself is designed as in the previous embodiment.

FIG. 6 shows an enlarged detail from FIG 19

Resonator wall 41 from. The secondary element 60 is thus effectively sealed against the interior space 33 of the filter element 10 .

FIG. 7 shows a longitudinal section through a filter system 100 according to a further exemplary embodiment of the invention with a resonator 40 which closes an open end plate 14 of a filter element 10 of a filter pack 1 . In this example, the filter system 100 has no secondary element.

The first end plate 14 of the filter element 10 has an opening 18 through which the resonator 40 partially extends. The opening 18 of the end disk 14 closes off from the resonator 40 . The opening 18 of the end plate 14 to the resonator 40 can be fluid-tight. An acoustic seal can be sufficient if the sealing point is on the clean side of the filter element, in particular the flap element. For this purpose, the first end plate 14 has a sealing structure 20 running around the opening 18 as a sealing device 22, which is in particular in the form of a PUR seal 24 or an O-ring seal 25 or a 2K seal 23 or as a plastic/plastic seal in the form a labyrinth seal can be formed.

Figure 8 shows an enlarged detail from Figure 7 in the area of the end plate 14 of the filter element 10 with a sealing device 22 designed as a 2K seal 23, while Figure 9 shows an enlarged detail from Figure 7 in the area of the end plate 14 of the filter element 10 with a sealing device 22 according to a further embodiment in the form of a PUR seal 24 is shown.

FIG. 10 shows a longitudinal section through a filter system 100 according to a further exemplary embodiment of the invention with a resonator 40 which closes the open end disks 14, 66 of a filter element 10 and a secondary element 60 of a filter pack 1. Both end disks 14, 66 of both the filter element 10 and the secondary element 60 have central openings 18 and 70, respectively, through which the resonator 40 reaches and thus closes and seals the end disks 14, 66.

Figure 11 shows an enlarged detail from Figure 10 in the region of the end plates 14, 66 of the filter pack 1. In this embodiment 20

Sealing structures 20, 72 are designed as 2K seals 23, 73 molded onto the openings 18, 70 of the end disks 14, 66, which when the resonator 40 is pushed in lie tightly against the resonator wall 41 with sealing lips.

Figure 12 shows an enlarged detail from Figure 10 in the area of the end plates 14, 66 of the filter pack 1 with a sealing device 22 according to a further exemplary embodiment, in which the sealing structures 20, 72 are designed as PUR seals 24, 75 on the openings 18, 70 of the end plates 14 , 66 are foamed, which lie tightly against the resonator wall 41 when the resonator 40 is pushed in.

FIG. 13 shows a longitudinal section through a filter element 10 with a resonator 40 according to a further exemplary embodiment, in which the resonator 40 is designed as part of the central tube 30 of the filter element 10 .

The filter element 10 comprises the hollow-cylindrical filter bellows 12, which is closed off with the end plates 14, 16 on the two opposite end faces 26, 28. The first end plate 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 plate 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 .

The filter bellows 12 is supported on the inside by the center tube 30 against the pressure of the flowing fluid, which flows from the untreated fluid side 50 on the outside to the clean fluid side 52 on the inside.

In this exemplary embodiment, the bottom 42 of the resonator 40 is integrated into a bottom 31 of the center tube 30 of the filter pack 1 . The resonator 40 is formed in one piece with the central tube 30 and can be manufactured inexpensively. In addition, the resonator 40 does not have to be assembled in a separate operation.

FIG. 14 shows the central tube 30 with an integrated resonator 40 according to the exemplary embodiment from FIG. 13 in a longitudinally sectioned isometric view. Of the 21

Resonator 40 is connected and stabilized to central tube 30 via a plurality of stiffening elements 38 running radially from resonator wall 41 to central tube 30 . The stiffening elements 38 are also connected in one piece to the central tube.

The open end 43 of the resonator has a serrated edge. As a result, particularly advantageous acoustic damping properties of the resonator 40 can be achieved.

FIG. 15 shows a longitudinal section through a filter system 100 with a resonator 40 according to a further exemplary embodiment, in which the resonator 40 is designed as part of an end plate 66 of a secondary element 60 .

The secondary element 60 arranged in the interior of the filter element 10 has a flea which corresponds to only approximately half the flea of the filter element 10 . The secondary element 60 is arranged in the upper part of the filter housing 110 by means of a screw connection 80 in the central tube 30 on top of the second end plate 16 of the filter element. The end disk 66 of the secondary element 60 arranged in the area of the end face 68 has a central opening 70 which merges into the open end 43 of the resonator 40 . The length of the resonator is arranged outside of the secondary element 60 and is directed towards the first end plate 14 of the filter element 10 with its bottom 42 as the closed end. Advantageously, the resonator 40 can be formed in one piece with the end plate 66 of the secondary element 60 or with a support structure 64 (not shown) of the secondary element 60 .

FIG. 16 shows an exploded view of a filter system 100 with a resonator 40 according to a further exemplary embodiment, in which the resonator 40 is designed as part of a support structure 64 of a secondary element 60. The view is from the side of the housing base 114 of the filter housing 110 . As part of the secondary element 60, the resonator 40 can only be seen with its base 42.

FIG. 17 shows a longitudinally sectioned isometric illustration of the filter system 100 according to FIG. 16, while the secondary element 60 of the filter system 100 with the resonator 40 is shown in FIG. 22

In this exemplary embodiment, the resonator 40 is connected to the support structure 64 of the secondary element 60 and can in particular be formed in one piece with the support structure 64 . The resonator wall 42 of the resonator 40 is connected to the support structure 64 by stiffening elements 38 in order to stabilize the resonator 40 . The stiffening elements 38 can in particular also be formed in one piece with the support structure 64 . The open end 43 of the resonator 40 can be designed as a jagged end for acoustic reasons.

The end plate 66 of the secondary element 60 can be foamed onto the support structure 64 with PUR, for example. The secondary element 60 can have a filter bellows 62 radially outside the support structure 64, which can also be designed as a fleece.

FIG. 19 shows a longitudinal section through a filter system 100 with a resonator 40 according to a further exemplary embodiment, in which the resonator 40 is connected to an end plate 66 of a secondary element 60 via a snap-in connection 49 . The resonator 40 is arranged with its base 42 as the closed end in the area of the end plate 66 of the secondary element 60 . The end disk 66 is connected to the support structure 64 of the secondary element 60 .

FIG. 20 shows an enlarged detail of the locking connection 49 of the resonator 40 according to the exemplary embodiment in FIG. 19 in an isometric view, while in FIG. 21 the secondary element 60 is shown in a longitudinally sectioned isometric view.

The latching connection 49 comprises a plurality of resonator-side latching elements 92 arranged on the circumference of the resonator 40, which can latch via a rotational movement of the resonator 40 about the longitudinal axis N of the secondary element 60 with a plurality of supporting structure-side latching elements 93 designed complementary thereto. Thus, the resonator 40 can be connected to the support structure 64 or the end plate 66 of the secondary element 60 by placing the resonator 40 on the end plate 66 inside the secondary element 60 and rotating it around the longitudinal axis N 23 is rotated. In this exemplary embodiment, the base 42 of the resonator 40 is arranged at the level of the latching connection 49 in order to achieve favorable stiffening of the latching elements 92 on the resonator side. The latching elements 93 on the supporting structure side are firmly connected to the supporting structure 64 of the secondary element 60 .

FIG. 22 shows an exploded view of a filter system 100 with a resonator 40 according to a further exemplary embodiment, in which the resonator 40 is connected to an end 32 of the central tube 30 opposite the first end face 26 of the filter element 10 . In addition, FIG. 23 shows the filter element 10 of the filter system 100 according to FIG. 22 with the mounted resonator 40 in an isometric representation. In this exemplary embodiment, the resonator 40 is connected to the central tube 30 via a latching connection 45 and can thus be exchanged from the clean fluid side 52 .

FIG. 24 shows an enlarged detail of the latching connection 45 of the resonator 40 according to FIG.

The latching connection 45 comprises a plurality of resonator-side latching elements 84 arranged on the circumference of the resonator 40, which can latch via a rotational movement of the resonator 40 about the longitudinal axis L of the filter element 10 with a plurality of central tube-side latching elements 85 designed to complement it. Thus, the resonator 40 can be connected to the central tube 30 of the filter element 10 by rotating the resonator 40 about the longitudinal axis L inside the filter element 10 . The locking elements 85 on the central pipe side are firmly connected to the central pipe 30 of the filter element 10 .

FIG. 25 shows a longitudinal section through a filter system 100 with a resonator 40 according to a further exemplary embodiment, in which the resonator 40 is pushed into an opening 70 in an end plate 66 of a secondary element 60 . The resonator 40 is advantageously connected to the end plate 66 via a latching connection 47 .

FIG. 26 shows an enlarged detail of the locking connection 47 of the resonator 40 according to FIG. 25, while an enlarged detail of a sealing structure 72 of the resonator 40 is shown in FIG. The sealing structure 72 includes this 24

Exemplary embodiment, a PUR seal 75, which is foamed onto the end plate 66 of the secondary element 60 and, when the resonator 40 is mounted, rests tightly against the resonator wall 41 of the resonator 40.

FIG. 28 shows a longitudinally sectioned isometric view of the secondary element 60 in a plan view of the end plate 66, while FIG. 29 shows an isometric view of the latching connection 47 of the resonator 40. Figure 30 shows an exploded view of the secondary element 60 with the resonator 40.

The latching connection 47 comprises a plurality of resonator-side latching elements 88 arranged on the circumference of the resonator 40, which can latch via a rotational movement of the resonator 40 about the longitudinal axis N of the secondary element 60 with a plurality of end-plate-side latching elements 89 designed complementary thereto. Thus, the resonator 40 can be connected to the end plate 66 of the secondary element 60 by rotating the resonator 40 about the longitudinal axis N inside the secondary element 60 . The latching elements 89 on the end disk are firmly connected to the end disk 66 of the secondary element 60 .

FIG. 31 shows an isometric view of a filter element 10 with a resonator 40 according to a further exemplary embodiment, in which the resonator 40 is pushed into an opening 18 in an end plate 14 of the filter element 10 .

The resonator 40 is pushed into the opening 18 of the end plate 14 from the first end face 26 of the filter element 10 . In this case, the resonator 40 is connected to the end plate 14 in particular via a latching connection 46 .

FIG. 32 shows the filter element 10 according to FIG. 31 with a mounted resonator 40, while FIG. 33 shows an isometric representation of the latching connection 46 of the resonator 40.

The latching connection 46 comprises a plurality of latching elements 86 on the resonator side which are arranged on the circumference of the resonator 40 and which, via a rotational movement of the resonator 40 about the longitudinal axis L of the filter element 10, have a plurality of complementary 25 designed for this end disc side locking elements 87 can lock. Thus, the resonator 40 can be connected to the central tube 30 of the filter element 10 by rotating the resonator 40 about the longitudinal axis L inside the filter element 10 . The latching elements 87 on the end disk are firmly connected to the end disk 14 of the filter element 10 .

FIG. 34 shows a longitudinally sectioned isometric illustration of a filter system 100 according to a further exemplary embodiment, in which the resonator 40 is mounted on the secondary element 60 and can be exchanged from a clean fluid side.

The resonator 40 is connected to an end 74 of the support structure 64 of the secondary element 60 opposite the first end face 26 of the filter element 10 via a latching connection 48 . In this way, the resonator 40 can advantageously be exchanged from a clean fluid side 52 .

FIG. 35 shows an exploded view of the secondary element 60 with the resonator 40 of the exemplary embodiment according to FIG. 34, while FIG. 36 shows an isometric view of the latching connection 48 of the resonator 40.

The latching connection 48 comprises a plurality of resonator-side latching elements 90 arranged on the circumference of the resonator 40, which can latch via a rotational movement of the resonator 40 about the longitudinal axis N of the secondary element 60 with a plurality of supporting structure-side latching elements 91 designed complementary thereto. Thus, the resonator 40 can be connected to the support structure 64 of the secondary element 60 by rotating the resonator 40 about the longitudinal axis N inside the secondary element 60 . The latching elements 91 on the supporting structure side are firmly connected to the supporting structure 64 of the secondary element 60 .

Figures 37 and 38 show another embodiment of a filter system 100 with an additional shunt resonator outside of the filter package 1. Figure 37 shows an isometric view of a filter element-side resonator structure 220 and Figure 38 is an isometric view of the filter system 100 with the filter package 1 from Figure 26

37 with a view of an inner side 116 of the lower housing part 114 with a housing-side resonator structure 120.

The filter system 100 can advantageously have additional measures for reducing the noise emission on the closed side of the filter pack 1 . Thus, a resonator structure 220 can also be integrated into a bottom 31 of the filter pack 1 as a shunt resonator. The bottom 31 can advantageously be designed as the bottom of a central tube 30 of the filter element 10, which supports the filter bellows 12 from an inside against the pressure of the flowing fluid. At least one element-side resonator structure 220 for noise damping of a flowing fluid can be formed on the base 31 . The element-side resonator structure 220 can have two grooves 222, 224 separated from one another by a partition 226, at least one of the two grooves 222, 224 being connected to an interior space 230 of the filter pack 1 via an opening 228. A housing-side resonator structure 120 which is complementary to the element-side resonator structure 220 and has two grooves 122 , 124 separated from one another by a partition 126 can be formed on an inner side 116 of the housing lower part 114 . When the filter system 100 is assembled as intended, the element-side resonator structure 220 can seal tightly 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 connection openings 128 in at least one of the partition walls 226, 126.

The housing-side resonator structure 120 can be formed on the inside 116 of the housing lower part 114 and can expediently be formed 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 lower housing part 114, the two resonator structures 220, 120 work together and form two cavity spaces separated by partitions 226, 126, which allow a certain fluid exchange via connecting openings 128 in the partitions 226, 126 allow each other to dampen noise. The actual resonator is only formed when the filter system 100 is assembled with the two resonator structures 220, 120 that match one another. 27

The two resonator structures 220, 120 can be sealed using a sealing structure 234 with a suitable sealing material, for example polyurethane (PUR), which is usually used to manufacture an end plate 232 of such a filter element 10 by foaming PUR foam on an end face 216 of the bottom 31 of the

Filter element 10 is used. In this way, sealing can be achieved easily and reliably, and no additional manufacturing steps are required. Supporting elements 236 for supporting the filter element 10 on the inside 116 of the lower housing part 114 when the filter element 10 is installed in the filter housing 110 can also be integrated into the end disk 232 formed in this way.

28

Reference sign

1 filter pack

10 filter element 12 filter bellows 14 first end plate 16 second end plate 18 opening 20 sealing structure

22 sealing device

23 2K seal

24 PUR seal

25 O-ring seal

26 first face

28 second face

29 fluid passage

30 center tube

31 floor

32 end

33 interior

34 support structure 36 support element

38 stiffening element

40 resonators

41 resonator wall

42 floor

43 end

45 snap connection

46 snap connection

47 snap connection

48 snap connection

49 snap connection

50 raw fluid area 52 clean fluid area 29

secondary element

62 filter bellows

64 support structure

66 end plate

68 face

70 opening

72 sealing structure

73 2K seal

74 end

75 PUR seal

76 O-ring seal

77 end

80 screw connection

84 locking element

85 locking element

86 locking element

87 locking element

88 locking element

89 locking element

90 detent element

91 locking element

92 locking element

93 locking element

100 filter system

102 entry

104 outlet

110 filter housing

112 housing top

114 lower part of the housing

116 inside

118 fastener

120 case-side resonator structure

122 slots 30

124 slots

126 partition

128 connection openings

130 exit

134 sealing structure

136 ring groove

216 face

220 resonator structure

222 slots

224 slots

226 partition

228 opening

230 interior

232 end plate

234 sealing structure

236 support element

L Longitudinal axis of the filter element

M housing axis

N longitudinal axis secondary element

Claims

31 claims

A filter system (100) for filtering a fluid, at least comprising

- a filter housing (110) with at least one upper housing part (112) and one lower housing part (114), which extend along a housing axis (M),

- a filter pack (1), which separates a clean fluid side (52) and a raw fluid side (50) in a fluid-tight manner, comprising at least one filter element (10), the at least one filter element (10) having a hollow-cylindrical filter bellows (12 ), wherein the filter element (10) is essentially closed on at least one first end face (26) and has a first end plate (14) which is opposite a second end plate (16) with a fluid passage (29) for the filtered fluid,

- and a resonator (40) with one end closed by a base (42), the resonator (40) inside the filter pack (1) with its base (42) facing the first end plate (14) of the filter element (10) is arranged directed.

2. Filter system according to claim 1, wherein the resonator (40) and the filter pack (1) adjoin one another via a sealing device (22).

3. Filter system according to claim 1, wherein the filter pack (1) comprises a center tube (30) arranged inside, the bottom (42) of the resonator (40) fitting into a bottom (31) of the center tube (30) of the filter pack (1). is integrated.

4. Filter system according to claim 1, wherein a bottom (42) opposite open end (43) of the resonator (40) is fixed in the region of the second end plate (16).

5. Filter system according to one of the preceding claims, wherein the first end plate (14) has an opening (18) through which the resonator (40) partially extends, the opening (18) of the end plate (14) to the resonator (40) completes. 32

6. Filter system according to one of the preceding claims, wherein the first end plate (14) has a sealing structure (20) running around the opening (18) as a sealing device (22), in particular a PUR seal (24) or an O-ring seal ( 25) or a 2K seal (23) or a labyrinth seal.

7. Filter system according to one of claims 3 to 6, wherein the resonator (40) is connected to the central tube (30) via a snap-in connection (45).

8. Filter system according to one of claims 3 to 7, wherein the resonator (40) is connected to an end (32) of the central tube (30) opposite the first end face (26) of the filter element (10), in particular via a snap-in connection (45 ) is connected, in particular wherein the resonator (40) is arranged to be exchangeable from the clean fluid side (52).

9. Filter system according to one of the preceding claims, wherein the resonator (40) is pushed from the first end face (26) of the filter element (10) into the opening (18) of the end plate (14), in particular via a snap-in connection (46) with the End plate (14) is connected.

10. Filter system according to one of claims 3 to 9, wherein the filter pack (1) further comprises a secondary element (60) with a hollow-cylindrical filter bellows (62) arranged around its longitudinal axis (N) which, in particular concentrically, to the housing axis (M) , is arranged inside the central tube (30) of the filter element (10), the resonator (40) being at least partially, in particular concentrically, to the longitudinal axis (N), inside the secondary element (60) with the closed end (42) to the first end plate (14) of the filter element (10) is arranged in a directed manner.

11. Filter system according to claim 10, wherein the secondary element (60) has an end plate (66) with an opening (70) through which the resonator (40) partially extends, the opening (70) of the end plate (66) to the 33

Resonator (40) closes tightly.

12. Filter system according to claim 11, wherein the end plate (66) has a sealing structure (72) surrounding the opening (70), in particular a 2K seal (73) or a PUR seal (75) or an O-ring seal ( 76) or has a labyrinth seal.

13. Filter system according to one of claims 10 to 12, wherein the resonator (40) is connected to a support structure (64) of the secondary element (60), in particular is connected in one piece.

14. Filter system according to claim 13, wherein the resonator (40) is connected to the end plate (66) of the secondary element (60) via a latching connection (49).

15. Filter system according to one of claims 11 to 14, wherein the resonator (40) is pushed from the end face (68) of the secondary element (60) into the opening (70) of the end plate (66), in particular via a latching connection (47). the end plate (66) is connected.

16. Filter system according to one of the preceding claims 10 to 15, wherein the resonator (40) is connected to an end (74) of the support structure (64) of the secondary element (60) opposite the first end face (26) of the filter element (10), is connected in particular via a latching connection (48), in particular the resonator (40) being arranged such that it can be changed from a clean fluid side (52).

17. Filter element (10) for use in a filter system (100) according to one of Claims 1 to 16, with a hollow-cylindrical filter bellows (12) arranged around its longitudinal axis (L), the filter element (10) on a first end face (26) is at least essentially closed and the first end face (26) has at least one first end plate (14) which is opposite a second end plate (16) with a fluid passage (29) for the filtered fluid. 34 Secondary element (60) for use in a filter system (100) according to one of Claims 1 to 16, with a hollow-cylindrical filter bellows (62) arranged around its longitudinal axis (N), the secondary element (60) having an end disk on one end face (68). (66).