Water filter and filter cartridge for a water filter

Abstract

A filter (1) comprising a filter housing (20), a cylindrical filter cartridge (21) detachably held in the filter housing (20) made of a cartridge body (25) which is provided with a detachable lid ring (22) and an adapter plate (23) held opposite the lid ring (22), wherein the adapter plate (23) is provided with a threaded adapter (24) for mounting the cylindrical filter cartridge (21) in the filter housing (20), characterized by at least one roll (30) which is wound from a multi-layered, cuboid filter element (3) and is fitted in the cartridge body (25) in a form-fit and force-fit manner.

Description

[0001] The invention relates to a water filter. In particular, the filter comprises a filter housing. A detachably held, cylindrical filter cartridge is located in the filter housing. The filter cartridge consists of a cartridge body with a detachable lid ring and an adapter plate mounted opposite the lid ring. The adapter plate is provided with a threaded adapter for mounting the cylindrical filter cartridge in the filter housing.

[0002] Furthermore, the invention relates to a filter cartridge for a water filter. In particular, the filter cartridge comprises a cartridge body defined by a rigid cylindrical wall. Several lateral openings are provided in the cylindrical wall. A lid ring is detachably connected to the cartridge body. Opposite the lid ring, an adapter plate is mounted, which is provided with a threaded adapter for detachably mounting the filter cartridge in a filter housing.

[0003] Austrian patent AT 516276 B1 relates to a filter device with a filter housing for a fibrous filter medium. The filter housing has an inlet for the liquid to be filtered and a suction opening for the filtered liquid. The filter housing is divided by an internal partition plate with through-holes into a suction-side pre-chamber and an inlet-side filter chamber. The filter chamber provides a secure and dimensionally stable receiving area for the ball-shaped fibrous material.

[0004] German utility model DE 20 2022 100 030 U1 discloses a filter with a filter housing into which at least one cylindrical filter element can be received. The at least one cylindrical filter element is positively fitted to an inner surface of the filter housing. The at least one cylindrical filter element is cut from a block of filter material to fit the filter housing precisely.

[0005] German patent DE 10 2016 108 558 B2 discloses a filtration arrangement for liquid media. A filter housing contains at least one filter layer consisting of a composite nonwoven layer, wherein the filter layer comprises at least one geometric filter body cut from the composite nonwoven layer.

[0006] German patent application DE 10 2017 124 251 discloses a tubular filter insert made of a cuboid filter material wound around a core into a spiral with at least one turn. The number of turns depends on the diameter of the receptacle for the filter insert.

[0007] In state-of-the-art pleated cartridge filters (pleat filters, paper filters), the filter medium consists of cellulose or cellulose mixtures. Filtration occurs exclusively at the surface, where dirt accumulation forms a protective layer, leading to rapid clogging. Cleaning the filter material is limited and usually involves chemical treatment with chlorine. Furthermore, cellulose or cellulose mixtures are biologically active materials, which can lead to biofouling.

[0008] State-of-the-art sand and glass filters employ layered filtration, with the retention of dirt particles depending on the grain shape, size, and compaction. Backwashing is essential for these filters. Furthermore, biofilm formation between the grains is unavoidable. Additionally, these filters require a large installation space to provide the necessary filtration capacity.

[0009] State-of-the-art filters can be filled with filter balls or plastic fillings. The filter balls are loose and have an undefined pore structure. This leads to particle displacement during filter operation and mechanical deformation of the filter balls. Microbiological colonization can also occur inside the filter balls.

[0010] State-of-the-art filters can be equipped with fabrics, sieves, or nets for filtering a liquid medium. For filtration, a two-dimensional filter plane is provided, which has a purely geometric sieving effect and does not retain particles at depth. Immediate clogging with fine particles can also occur.

[0011] In state-of-the-art cartridge systems for filtering a liquid medium, the cartridge is a disposable product. The filter medium is permanently bonded or welded to it. Furthermore, modular adaptation is not possible with these cartridge systems. The filter material must be replaced along with the cartridge (complete replacement).

[0012] State-of-the-art filters can also be designed as wound roller filters. These roller filters are usually made of paper, nonwoven fabric, or disposable material. They have a continuous material consumption and are not regenerable. These roller filters are designed exclusively for industrial applications.

[0013] The object of the invention is to provide a filter that is easy and inexpensive to manufacture, wherein the filter material required for filtration is easy to clean and reusable, the filter reduces the amount of waste and has a high filtration performance with low pressure loss.

[0014] This problem is solved by a reusable filter that includes the features of claim 1 as well as its dependent claims.

[0015] Another object of the invention is to provide a filter cartridge for a filter that can be easily and quickly inserted into a filter housing, enables effective and energy-saving filtration of liquids, wherein the required filter material is easy to clean and reusable, the filter cartridge reduces the amount of waste and has a high filtration performance with low pressure loss.

[0016] This problem is solved by a reusable filter cartridge comprising the features of claim 8 and its dependent claims.

[0017] According to one embodiment, the filter according to the invention is characterized in that it comprises a filter housing and a cylindrical filter cartridge detachably held in the filter housing. The filter cartridge consists of a cartridge body provided with a detachable lid ring and an adapter plate held opposite the lid ring. The adapter plate with a threaded adapter serves to mount the cylindrical filter cartridge in the filter housing. At least one roll, wound from a multi-layered, cuboid filter element, is positively and frictionally locked in the cartridge body.

[0018] The advantage of the filter according to the invention is that it is simple and inexpensive to manufacture, the filter material required for filtration is easy to clean and reusable, and the amount of waste is reduced. Furthermore, it exhibits high filtration efficiency with low pressure loss.

[0019] The multi-layered, three-dimensional depth filter fleece is rolled into a roll and made of synthetic polymer. Preferably, the filter material consists of polyethersulfone (PES) or functionally equivalent high-performance thermoplastic polymers.

[0020] According to one embodiment, each multilayer, cuboid filter element has a length, width, and thickness, wherein the multilayer, cuboid filter element is wound into a roll along its length. The at least one wound roll is positively and non-positively locked into the cartridge body. The roll has a height that corresponds to the width of the multilayer, cuboid filter element.

[0021] The advantage of filter material wound into a roll is that the roll's structure allows for a defined winding density and tension, ensuring a uniform flow of the medium to be filtered through at least one roll. The winding tension also ensures a secure fit of the roll within the cartridge body.

[0022] The filter material from which the roll is formed is characterized by its hydraulic properties, such as very low initial pressure loss, high flow rate at low pump pressure, and a flow-optimized open fiber structure. The filter material, formed into rolls, is suitable for: pool and whirlpool filter systems, skimmer filters, filter modules in cleaning robots, or wound roll filters in cartridge housings (LongLife system).

[0023] The rollers can be removed from the cartridge body as needed (after prolonged use in the filter) and are reusable, meaning they can be reinserted into the cartridge body multiple times. The rollers are manufactured to fit the specific cartridge body used in the filter and can be arranged inside the filter cartridge of a pool or whirlpool filter.

[0024] The filter material, formed into rolls, is characterized by its regenerability. Cleaning can be achieved by mechanical rinsing under water. Optionally, thermal treatment with boiling water can also be performed. Chemical regeneration is not required. The filter material does not absorb microbiological nutrients and exhibits no biofouling growth within the filter material itself. Unlike sand, glass, filter balls, or cellulose cartridges, no microbiological deposit zones form within the material according to the invention.

[0025] According to one possible embodiment of the invention, the roll is wound in such a way that the wound roll has a central clearance extending in the direction of the axis of the roll.

[0026] The advantage of this filter is that the type of wound roll creates a space that allows for improved flow through at least one roll and the filter material within that roll. The wound roll structure of the filter material results in a large filter surface area within a very small installation space and allows for modular adaptation to the geometry of the cartridge body.

[0027] According to the invention, a sufficient number of rollers are inserted into the cartridge body to extend along its entire length. The axes of the rollers are aligned parallel to the axis of the cartridge body. This arrangement of the rollers has the advantage that the cuboid filter material of the rollers is essentially in direct contact with the wall of the cartridge body, so that the liquid medium to be cleaned, which enters through the openings in the cartridge body, passes directly into the filter material of the rollers.

[0028] According to a further embodiment of the invention, an inlet filter fleece is provided at the upper end of the cartridge body, which lies on the uppermost roll in the cartridge body. The inlet filter fleece serves to retain coarse particles, such as hair, insects, or leaves.

[0029] According to a further embodiment of the invention, an activated carbon fleece filter is provided at the lower end of the cartridge body. The activated carbon fleece filter has the advantage that it essentially eliminates bacteria in the liquid medium to be purified.

[0030] According to a further embodiment of the invention, the plurality of openings in the wall of the cartridge body are teardrop-shaped. The teardrop-shaped openings are arranged in the cartridge body such that the circular end of each teardrop-shaped opening is oriented towards the lower end of the cartridge body. The teardrop shape of the openings has the advantage that the liquid medium entering the cartridge body and being cleaned is directed obliquely downwards (towards the lower end of the cartridge body).

[0031] According to a further objective of the invention, this is achieved by a filter cartridge for a liquid medium, in particular water, which is characterized by a cartridge body with a rigid cylindrical wall. Several lateral openings are provided in the wall. A lid ring is detachably connected to the cartridge body. Opposite the lid ring, an adapter plate is mounted (which may also be detachably designed) and is provided with a threaded adapter for detachably mounting the filter cartridge in a filter housing. At least one roll, consisting of a cuboid filter element wound along one length of the cuboid filter element, can be inserted into the cartridge body and removed again for cleaning. The at least one roll is designed such that it fits snugly and securely within the cylindrical cartridge body.

[0032] The advantage of the filter cartridge according to the invention is that it is a refillable system into which the filter material, wound into a roll, can be inserted. The filter cartridge itself is not a disposable product; its individual components consist of a long-term stable polymer and are detachably connected. Furthermore, at least one roll wound from the cuboid filter element enables volumetric dirt absorption across the entire depth of the roll. The filter material itself is a three-dimensionally structured, synthetic depth filter material that can be regenerated mechanically and / or thermally without the need for chemical cleaning or disinfecting agents.

[0033] According to an advantageous embodiment of the invention, each roll is wound along the length of the cuboid filter element. The wound roll then has a height corresponding to the width of the cuboid filter element. The roll is wound in such a way that it forms a central recess extending in the direction of the roll's axis.

[0034] The advantage of this type of wound roll is that the roll structure has a defined winding density and tension, ensuring a uniform flow. Furthermore, the filter material of the roll can be regenerated and reused multiple times.

[0035] According to a further advantageous embodiment of the invention, the cartridge body is provided at its upper end with a removable lid ring and at its lower end with an adapter plate, which can also be removable. The adapter plate is provided with a threaded adapter which, depending on the requirements, has either an external or an internal thread for mounting in the filter housing.

[0036] The advantage of the filter cartridge according to the invention is its modular design, allowing it to be adapted to the specific requirements of the filter in use and its housing. This reduces the number of parts and the cost of a filter cartridge. The removable lid ring and / or adapter plate allow the filter material (wound into rolls), the inlet filter fleece, and the activated carbon fleece filter to be removed from the cartridge body for cleaning or regeneration and then reinserted.

[0037] The filter material from which the rolls are formed is used for filtering water in pools, whirlpools, skimmers, robotic cleaners, or cartridge systems. The filter material is a three-dimensionally structured, synthetic depth filter material that enables volumetric dirt capture across its entire depth. The filter material can be regenerated mechanically and / or thermally without the use of chemical cleaning or disinfecting agents.

[0038] The filter material consists of a synthetic polymer, preferably polyethersulfone (PES). It is free of cellulose, paper fibers, natural fibers, or biodegradable components. Filtration is a progressive depth filtration process from coarse to fine particles.

[0039] The filter material is primarily used for filtering water in pools, whirlpools, skimmers, robotic cleaners, or cartridge systems. The filter material is a three-dimensionally structured, synthetic depth filter material that enables volumetric dirt capture across its entire depth. This volumetric dirt capture is further increased and improved by providing a roll of the synthetic depth filter material and positioning it within the cartridge body according to the invention.

[0040] According to the invention, the three-dimensional synthetic depth filter material (cuboidal) is formed as a wound roll. The roll consists of one or more layers of the filter material wound with a defined winding tension. The rolls have a reproducible material density and enable uniform flow across the entire roll width.

[0041] By winding the cuboid filter material into a roll, a very large and effective filter surface can be achieved in a small installation space. Filtration occurs volumetrically across multiple layers of the filter material. Pressure loss remains low even with increasing dirt loading of the filter material. The rolls themselves can be designed for cleaning, allowing the cuboid filter material to be mechanically rinsed and thermally regenerated.

[0042] The at least one roller is arranged inside the cylindrical cartridge body and allows axial or radial flow through it. The at least one roller can be removed from the cartridge body and reinserted into it.

[0043] The filter cartridge, comprising a cartridge body, a lid ring, and an adapter plate with a threaded adapter, is reusable, while only the filter material (at least one roll, inlet filter fleece, and activated carbon fleece filter) of the cartridge body is regenerated or replaced. The individual components of the cylindrical filter cartridge (cartridge body, lid ring, adapter plate, and threaded adapter) can be manufactured using a 3D printing or injection molding process, are mechanically stable, and reusable.

[0044] The filter material can consist of several layers of nonwoven fabric. Depending on the requirements for the filter properties or mechanical properties, the filter material can be manufactured with any number of nonwoven layers. The individual nonwoven layers contain a multitude of continuous fibers that also extend to adjacent layers. The continuous fibers within the individual layers and those extending to adjacent layers are interconnected to a certain extent (number of connections (cross-links) of the continuous fibers per unit volume) by the material itself.

[0045] The invention and its advantages will now be explained in more detail with reference to the accompanying drawings, using exemplary embodiments, without thereby limiting the invention to the embodiment shown. The proportions in the figures do not always correspond to the actual proportions, as some shapes are simplified and others are enlarged in relation to other elements for better illustration. Fig. Figure 1 shows a schematic cross-sectional view through a composite nonwoven layer used according to the present invention; Fig. Figure 2 shows an enlarged view of the filter material with a schematic representation of the deposition of dirt particles; Fig. Figure 3 shows a perspective view of a cuboid filter element. Fig. Figure 4 shows a perspective view of a roll wound from the cuboid filter element, which has a length in the direction of the axis that corresponds to the width of the cuboid filter element. Fig. Figure 5 shows a perspective view of a cartridge body that is part of the filter cartridge. Fig. Figure 6 shows an enlarged perspective view of the cartridge body with the preferred design of the openings in the cartridge body. Fig. Figure 7 shows a perspective exploded view of an embodiment of the cylindrical filter cartridge. Fig. Figure 8 shows perspective views of two rolls wound from the cuboid filter element and an input filter fleece assigned to the uppermost roll. Fig. Figure 9 shows a schematic representation of a filter in which at least one filter cartridge is used. Fig. Figure 10 shows a cross-sectional view of a filter with an inserted filter cartridge according to the invention.

[0046] Identical reference numerals are used for identical or equivalently functioning elements of the invention. Furthermore, for the sake of clarity, only those reference numerals necessary for describing the respective figure are shown in the individual figures. The figures merely illustrate embodiments of the invention, without, however, limiting the invention to the illustrated embodiments.

[0047] Fig. Figure 1 shows a schematic view of a filter material 2. Depending on the requirements for the filter properties or the mechanical properties, the filter material 2 can consist of any number and density of continuous fibers 6 that overlap one another. The continuous fibers 6 are also interconnected to a certain extent, depending on the filter properties and the mechanical properties; that is, the continuous fibers 6 have a certain degree of cross-linking per unit volume.

[0048] Fig. Figure 2 shows an enlarged view of the filter material 2, in which the individual continuous fibers 6 are arranged in their random position within the filter element. The liquid medium 7 to be filtered passes through the filter material 2 between the continuous fibers 6. In doing so, the dirt particles 12 are released and adhere to the continuous fibers 6. This effect results in the purification of the liquid medium 7. Due to the random arrangement of the continuous fibers 6 within the filter material 2, the medium 7 to be filtered must follow a three-dimensional path through the filter material 2 in the cylindrical filter cartridge 21 (see Figure 2). Fig. 7) take. The path of the medium to be filtered 7 through at least one roller 30 (see Fig. 3) thus becomes long, so that the filter material 2 achieves effective filtration. In addition, the roll 30 is used as an insert in a cartridge body 25 (see Fig. 5) offers low flow resistance to the medium 7 to be filtered, which also leads to cost savings in the circulation pump for the filter.

[0049] Fig. Figure 3 shows a perspective view of a cuboid filter element 3 used in the present invention. The cuboid filter element 3 has a length L, a width B, and a thickness D. As shown in Fig. As shown in Figure 4, a roll 30 is formed from the cuboid filter element 3. The roll 30 has a height 35, which corresponds to the width B of the cuboid filter element 3. The wound roll 30 can have a central extending clearance 34 that extends in the direction of the axis A of the roll 30.

[0050] Fig. Figure 5 shows a perspective view of a cartridge body 25, which is part of a cylindrical filter cartridge 21 (see Fig. 7). The cartridge body 25 has a length L25 with an upper end 26 and a lower end 27. A rigid wall 29 of the cartridge body 25 has several openings 28 (see Fig. 6) designed to allow the passage of liquid (e.g. water to be cleaned) to the at least one roller 30 (see Fig. 4) enable. Fig. Figure 6 shows an enlarged perspective view of the cartridge body 25. The openings 28 of this embodiment of the cartridge body 25 are shaped like drops. The widened end of the drop faces the lower end 27 (see Figure 6). Fig. 5) of the cartridge body 25 aligned.

[0051] Fig. Figure 7 shows a perspective exploded view of an embodiment of the cylindrical filter cartridge 21. At its upper end 26, the cartridge body 25 is provided with a removable lid ring 22. At its lower end 27, an activated carbon fleece filter 31 is provided, which is held in the cartridge body 25 by the adapter plate 23 connected to the cartridge body 25. A threaded adapter 24 is connected to the adapter plate 23, with which the cylindrical filter cartridge 21 can be detachably fastened in the filter housing.

[0052] Fig. Figure 8 shows perspective views of two rolls 30 wound from the cuboid filter element 2. In the flow direction 4 of the liquid to be purified, an inlet filter fleece 32 is provided on the uppermost roll 30, which filters out macroscopic components of the liquid to be purified from the inflowing liquid. If, according to a possible embodiment of the invention, two or more rolls 30 are provided in the cartridge body 25, the rolls extend along the length of the cartridge body 25. The rolls 30 are aligned along their axis A (winding axis), with each axis A being parallel to the axis A25 (see Figure 8). Fig. 5) of the cartridge body 25.

[0053] Each roll 30 forms a clearance 34 extending in the direction of the axis A of the roll 30 by winding the cuboid filter element 3.

[0054] Fig. Figure 9 shows a schematic view of a possible embodiment of a filter 1 for filtering preferably liquid media 7. The medium 7 to be filtered is fed to the filter 1 via an inlet 42. The filter 1 comprises a filter housing 20, which can be closed with a lid 40 (cover). In the embodiment described here, the inlet 42 terminates in the lid 20. The at least one cylindrical filter cartridge 21 (see Figure 9) Fig. 7) is housed in the filter housing 20 together with the filter material 2, which is pre-assembled onto the cylindrical filter cartridge 21. The filtered medium 8 is discharged from the filter housing 20 via a drain 44. The filtered medium 8 can be supplied, for example, to a swimming pool, a whirlpool, an aquarium, or the like. A pump (not shown) can also be provided to ensure a specific flow rate through the filter 1.

[0055] Fig. Figure 10 shows a cross-sectional view of a filter 1 with an inserted cylindrical filter cartridge 21 according to the invention. The cylindrical filter cartridge 21 is screwed into the filter housing 20 by means of the threaded adapter 24. The medium 7 to be filtered enters the filter housing 20 and from there, via the lid ring 22 and the openings 28 in the rigid cartridge body 25, into the interior of the filter cartridge 21. The medium 7 to be filtered thus exits through the inlet filter fleece 32 provided at the upper end 26 and the rollers 30 from the filter material 2. Likewise, the medium 7 to be filtered enters the rollers 30 from the filter material 2 through the openings 28 in the rigid cartridge body 25. The filtered medium 8 exits the filter 1 via an activated carbon fleece filter 31.

[0056] In the embodiment described here, the medium 7 to be filtered enters the filter housing 20 of the filter 1 via an inlet 42, and the filtered medium 8 leaves the filter 1 via an outlet 44. Two separate rollers 30 are inserted in the cylindrical filter cartridge 21, which are oriented with respect to their axes A (see Fig. 5) are positioned one above the other in the cartridge body 25. The use of two rollers 30 in the cylindrical filter cartridge 21 serves only for descriptive purposes and is not to be construed as a limitation of the invention. The only condition is that the height 35 of the roller 30 or the total height 35 of several rollers 30 corresponds approximately to the length or height L25 of the cartridge body 25.

[0057] It is assumed that the present disclosure and many of the advantages mentioned therein will be understood from the preceding description. It is obvious that various modifications in the shape, construction, and arrangement of the components can be made without departing from the disclosed subject matter. The described form is merely explanatory, and it is the intention of the appended claims to encompass and include such modifications. Accordingly, the scope of the invention should be limited only by the appended claims. REFERENCE MARK LIST 1 filter 2 Filter material 3 cuboid filter elements 4 Flow direction 6 continuous fibers 7. Medium to be filtered 8 filtered medium 12 dirt particles 20 filter housings 21 cylindrical filter cartridges 22 Lid ring 23 Adapter plate 24 thread adapters 25 cartridge bodies 26 upper end 27 lower end 28 openings 29 rigid wall 30 rolls 31 activated carbon fleece filters 32 Inlet filter fleece 34 Free savings 35 Height of the roll, total height of several rolls 40 lids 42 Inflow 44 Procedure Axis A25 Axis of the cartridge body B width Thickness Length L L25 Length, Height QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] AT 516276 B1

[0003] OF 20 2022 100 030 U1

[0004] OF 10 2016 108 558 B2

[0005] OF 10 2017 124 251

[0006]

Claims

[1] A filter (1) comprising a filter housing (20), a cylindrical filter cartridge (21) detachably held in the filter housing (20) made of a cartridge body (25) which is provided with a detachable lid ring (22) and an adapter plate (23) held opposite the lid ring (22), wherein the adapter plate (23) is provided with a threaded adapter (24) for mounting the cylindrical filter cartridge (21) in the filter housing (20), characterized by at least one roll (30) which is wound from a multi-layered, cuboid filter element (3) and is fitted in the cartridge body (25) in a form-fit and force-fit manner. [2] Filter (1) according to claim 1, wherein each cuboid filter element (3) has a length (L), a width (B) and a thickness (D) and is wound along the length (L) to the roll (30) which is positively and force-fit in the cartridge body (25) and the roll (30) has a height (35) which corresponds to the width (B) of the cuboid filter element (3). [3] Filter (1) according to claim 2, wherein the roll (30) is wound such that the wound roll (30) has a central clearance (34) extending in the direction of the axis (A) of the roll (30). [4] Filter (1) according to one of the preceding claims, wherein such many rollers (30) are inserted into the cartridge body (25) that they extend substantially along a length (L25) of the cartridge body (25) and the axes (A) of the rollers (30) are aligned parallel to the axis (A25) of the cartridge body (25). [5] Filter (1) according to claim 4, wherein an inlet filter fleece (32) is provided on the uppermost roll (30) at the upper end (26) of the cartridge body (25). [6] Filter (1) according to any one of the preceding claims 4 to 5, wherein an activated carbon fleece filter (31) is provided at the lower end (27) of the cartridge body (25). [7] Filter (1) according to one of the preceding claims, wherein the cartridge body (25) is provided with a plurality of droplet-shaped openings (28) which are aligned in the cartridge body (25) towards the lower end (27) of the cartridge body (25). [8] Filter cartridge (21) for a liquid medium, comprising: a cartridge body (25) defined by a rigid cylindrical wall (29) in which several lateral openings (28) are provided, a lid ring (22) detachably connected to the cartridge body (25), and an adapter plate (23) held opposite the lid ring (22), which is provided with a threaded adapter (24) for the detachable mounting of the filter cartridge (21) in a filter housing (20), characterized by at least one roll (3) which is wound from a cuboid filter element (3) along a length (L) of the cuboid filter element (3) and is fitted in the cylindrical cartridge body (25) in a form-fit and force-fit manner. [9] Filter cartridge (21) according to claim 8, wherein the roll (30) wound along the length (L) of the cuboid filter element (3) has a height (35) corresponding to the width (B) of the cuboid filter element (3). [10] Filter cartridge (21) according to claim 9, wherein the roll (30) is wound such that the wound roll (30) has a central recess (34) extending in the direction of the axis (A) of the roll (30). [11] Filter cartridge (21) according to one of the preceding claims 8-10, wherein an inlet filter fleece (32) lies on the at least one roll (30) which points to the upper end (26) of the cartridge body (25) and is held in contact with the roll (30) by the lid ring (22) which is detachably connected to the cartridge body (25). [12] Filter cartridge (21) according to one of the preceding claims 8-11, wherein an activated carbon fleece filter (31) borders the at least one roller (30) which points to the lower end (27) of the cartridge body (25) and is held in contact with the roller (30) by the adapter plate (23) connected to the cartridge body (25). [13] Filter cartridge (21) according to claims 11 and 12, wherein at least the inlet filter fleece (32) and the at least one roller (30) can be removed from the cartridge body (25) with the lid ring (22) detached, cleaned and reinserted into the cartridge body (25). [14] Filter cartridge (21) according to one of claims 8-13, wherein the threaded adapter (24) is designed with an external thread or an internal thread for mounting in the filter housing (20).

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