Disc filter plate with carrier element

Abstract

A disc filter plate (2) for a filter system (1) for filtering suction air from a floor care device, comprising a disc-shaped support element (11) and one or more filter material elements (4) on a first and a second surface of the support element (11), through which suction air can flow into the disc filter plate (2), and one or more air outlet openings (8) through which the filtered suction air can flow out of the disc filter plate (2), wherein a first group of support webs (12a) are provided in the support element (11) as a support element for supporting a filter material element (4) arranged on the first surface of the support element (11), and a second group of support webs (12b) are provided in the support element (11) as a support element for supporting a filter material element (4) arranged on the second surface of the support element (11), said support webs serving to support the at least one filter material element (4), characterized in thatthat a free space is formed between at least one support web (12a) of the first group and at least one support web (12b) of the second group by spacing the groups apart from one another, so that suction air filtered by the filter material element (4) can flow through this free space between the first group of support webs (12a) and the second group of support webs (12b) to the air outlet opening (8) or the air outlet openings (8) of the disc filter plate (2), wherein the disc filter plate (2) is designed as a circular disc and wherein, in its carrier element (11), the two groups of support webs (12a, 12b) in the circular disc project radially outward in a spoke-like manner from a circular disc-shaped inner ring (14), which has a central opening (9) and at least one air outlet opening (8), and terminate with an outer ring (15) delimiting the outer circumferential line of the circular disc-shaped disc filter plate (2).

Description

Field of the invention

[0001] The invention relates to a disc filter plate for a filter system for filtering suction air of a floor care device according to the preamble of claim 1, as well as a suction air filter system according to claim 9 and a floor care device according to claim 11 with such a disc filter plate. Background of the invention

[0002] German utility model DE 74 03 930 U discloses a frame or disc filter, to whose frame, with one or more frame sections separated by intermediate struts, at least one support element is attached for supporting a sheet-like filter medium stretched over the frame. Webs formed between grooves expediently run in the longitudinal direction of the support element. The sheet-like filter medium, which can consist of natural or synthetic fabrics or even metal mesh, rests on them. The grooves on both sides form a continuous plate in the center of the support element.

[0003] Published patent application WO 88 / 01898 A1 discloses a filter system consisting of a plurality of disc filters. Each disc has ribs cast onto opposite surfaces of the discs. The ribs intersect each other, preventing dynamic forces from pushing the discs against each other during fluid flow through the discs. Accordingly, the ribs keep the fluid passages between the discs open.

[0004] Patent DE 37 06 402 C1 teaches a sector-shaped screen segment for disc filters for thickening fiber suspensions. A screen is embedded in frame legs or screen supports, which are formed as cast parts. Each screen support is designed as a grid formed by bars, with the bars being arranged so that they run radially and in the direction of rotation. The bars running in the direction of rotation are then set back from the bars running radially toward the segment interior, and the screen is embedded only in radially running bars. This ensures that the screen mesh surfaces are particularly dimensionally stable due to the close spacing between the supports supporting the screen.

[0005] German Patent Application DE 42 18 217 A1 discloses a disc filter for filtering water from a suspension, comprising sector-shaped filter plates. A replaceable filter element is formed by attaching the filter surfaces, i.e., a filter cloth or a filter mesh, to the wave crests of a wave-shaped frame part made of plastic sheet, for example, in such a way that they permanently adhere to one another, thus forming a rigid and replaceable filter element as a whole.

[0006] Utility model DE 20 2009 008 769 U1 describes a vacuum cleaner in which a plate-shaped grille comprising a front grille section and a rear grille section is arranged above an opening in a partition wall between a dust collection chamber and an engine compartment. A filter screen can be inserted between the front and rear grille sections.

[0007] According to JP 2005 - 058 986 A, a filter for filtering water or air has a flat, bowl-shaped holder through which a tube with openings runs, and the filter material is arranged above the openings.

[0008] The published patent application DE 10 2009 057 205 A1 discloses a filter for dust removal from process air, wherein a cloth-shaped filter material is placed around a support body designed as a vertically folded sheet metal in a wave-like manner.

[0009] From the published patent application DE 30 40 828 A1, a filter cloth support grid with a supporting frame is known which is covered with a hose-like round spiral mesh and over which a filter cloth pocket can be pushed. Problem underlying the invention

[0010] The invention is based on the object of creating a disc filter plate, as well as a suction air filter system and a floor care device with such a disc filter plate, which are improved over the prior art. In particular, the invention is intended to improve, for example, the aerodynamics in the aforementioned devices. Furthermore, it is intended to achieve, for example, a simplified structure of the aforementioned devices, so that, in particular, production costs and weight can be reduced, and noise generation due to the suction air flow is reduced. Inventive solution

[0011] The reference signs in all claims have no limiting effect, but are intended merely to improve their readability.

[0012] The object underlying the invention is achieved by a disc filter plate according to claim 1, a filter system according to claim 9, and a floor care device according to claim 11.

[0013] A filter system within the meaning of the invention is a device comprising one or more disc filter plates for cleaning suction air. After flowing through the suction air filter system and the associated suction air cleaning, the suction air has a lower level of contamination than before. The filtered-out contamination is, for example, dust, dirt, odor particles, chemicals, or other types of undesirable contamination of the suction air. Within the meaning of the invention, suction air is already considered to be cleaned if the contamination content of the cleaned air is lower than the contamination content of the sucked-in air. The suction air therefore does not necessarily have to be completely purified of the unwanted contamination content.

[0014] For the purposes of the invention, a floor care device is understood to be a household appliance for cleaning rooms, in particular a vacuum cleaner. Such a device usually comprises a housing, a suction hose that can be connected to it, and an electric motor arranged in the housing. The suction hose can be connected to a suction pipe that has a suction nozzle at one end. A floor care device, as mentioned above, is a canister vacuum cleaner with a bag or a canister vacuum cleaner that uses bagless dust separation technology, such as a cyclone separator. Also considered floor care devices within the meaning of the invention are upright vacuum cleaners and handheld vacuum cleaners.

[0015] A group of support webs is, in the sense of the invention, the totality of those support webs which serve the purpose of jointly supporting a filter material element arranged on one or more outer surfaces of the support element and supporting it against suction air.

[0016] The invention can, for example, achieve an overall improvement in aerodynamics, a reduction in pressure loss inside the disc filter plate, a comparatively low weight of such a disc filter plate, more cost-effective manufacturing, a simplified design of the disc filter plate, easier assembly, and these advantages generally have an improving effect on a disc filter plate, a filter system and a floor care device according to the invention. Preferred embodiment of the invention

[0017] Advantageous training and further education, which can be used individually or in combination with one another, are the subject of the dependent claims.

[0018] In a preferred embodiment, the support webs of at least one of the groups lie essentially in a common plane. It is particularly preferred that the support webs of all groups lie in planes that are essentially parallel to one another. In this way, a very flat and therefore compact design of the disc filter plate can advantageously be achieved. This enables a flat surface of the filter material element supported by the webs, through which dirt-laden suction air, preferably flowing in tangentially, can enter the disc filter plate over a large area. It is particularly preferred that all outer surfaces of the disc filter plate are essentially flat. Alternatively, one or more support webs can protrude from the filter plate plane, for example if a wavy or folded surface profile of the filter material element is to be created.This allows, for example, the surface area of ​​the filter material element to be larger than a completely flat surface, thus improving the effectiveness of the filter material.

[0019] According to the invention, the disc filter plate is designed as a circular disc. This is advantageous for its preferred use in a floor care device with a vortex tube separator, e.g., a vortex tube separator. In such floor care devices, the separation chamber is sometimes round-cylindrical, thus enabling optimal space utilization with a disc filter plate in the shape of a circular disc and a filter system formed from it in an essentially round-cylindrical shape.

[0020] According to the invention, in the support element of the circular disc, two groups of support rods project radially outwards like spokes from a circular inner ring, which has a central opening and at least one air outlet opening leading to this central opening, and terminate in an outer ring that delimits the outer circumferential line of the circular disc-shaped disc filter plate. This design can be very material-saving and weight-reducing, since compared to the prior art, a continuous plate-shaped support for the support webs can be omitted. It is preferred that the air outlet opening is designed as a circumferential annular gap in the inner ring. A circumferential annular gap can provide a large flow area with low air resistance. Alternatively, a plurality of individual openings is also possible. These openings can be window-like.A target pressure can thus be set depending on the fan power of the floor care device by selecting the appropriate window size. The support element is preferably designed in two parts. In this case, the first group of support webs is preferably connected to a first sub-element of the inner ring and a first sub-element of the outer ring, and the second group of support webs is connected to a second sub-element of the inner ring and a second sub-element of the outer ring. The sub-elements of the inner ring are preferably arranged collinearly with one another. The sub-elements of the outer ring are preferably arranged collinearly with one another. Preferably, one sub-element of the outer ring is arranged coaxially with a sub-element of the inner ring.In the manner described, the groups of support webs can be easily manufactured separately from one another and together with the corresponding sub-elements of the inner and outer rings, and then assembled with reduced effort. This also makes it possible to determine the spacing of the filter media elements inside the disc filter plate depending on the application. For example, the spacing between two opposing filter material elements inside the disc filter plate is essentially 6 mm or essentially 10 mm.

[0021] The support element can preferably be manufactured by casting or, alternatively, by injection molding. In the two-part embodiment, corresponding connecting means, for example a grooved connection, and particularly preferably additional sealing means, are preferably provided on the outer ring of the first sub-element and on the outer ring of the second sub-element in order to be able to stably join the separate groups of support webs together to form a complete support element. However, a support element of the present invention can also be designed in one piece, for example, cast in a mold. Preferably, all parts of the support element are cast from plastic using the casting process.

[0022] It is preferred that the filter material element(s) is / are attached to the inner ring and / or the outer ring. This allows the filter material element to be securely held to the support element. It is preferred that the filter material element is glued to the inner ring. It is even more preferred that the filter material element is glued to the outer ring. It is particularly preferred that the filter material element is glued to both the inner ring and the outer ring. For this purpose, it is preferably provided that the outer ring has a web-shaped edge which has two steps and that the filter element is firmly attached to the inward-facing, lower of the two steps, for example by gluing. Alternatively, the filter material element can be latched, hooked, inserted, screwed, or even nailed to the inner ring and / or the outer ring.

[0023] It is preferred that a surface of at least one filter material element facing away from its support element be flush with an upper edge of the outer ring. Such a design can be particularly space-saving and positively influence the aerodynamics between adjacent disc filter plates. It also makes it easy to achieve a completely flat outer surface of the disc filter plate. Alternatively, the at least one filter element can protrude beyond the upper edge of the outer ring or overlap it. This can be advantageous, for example, if the filter element is to be attached to the upper edge of the outer ring.

[0024] In a preferred embodiment, a support web from the group for supporting a filter element arranged above a first outer surface of the carrier element lies opposite a support web from the group for supporting the filter element arranged above the second outer surface of the carrier element, and the distance between the support webs of the first group and the support webs of the second group is bridged by one or more spacers. In this way, the stability of the carrier element can be increased and, at the same time, a good air throughput can be enabled. It is preferred that exactly one spacer is present between each pair of support webs, which are formed from one support web from each group. In this way, the influence of the spacers on the aerodynamics within the disc filter plate can be kept to a minimum, and unwanted noise from the suction air flow can be reduced.The length of the spacers allows for the precise spacing between the filter media elements mounted on the support bars to be adjusted, for example, to 6 mm or 10 mm. This allows the compactness of the design to be selected depending on the task and the desired suction pressures.

[0025] It is also preferred that, if the air outlet opening is formed as a circumferential annular gap in an inner ring of the support element, this annular gap is also kept open by one or more spacers of constant size. It is then particularly preferred that the inner ring has the same number of spacers as there are pairs of support webs projecting from the inner ring. It is particularly preferred that the spacers be columnar. However, they can alternatively also be wedge-shaped or spherical. In general, rounded shapes can have a noise-reducing effect.

[0026] It is preferred that the spacer(s) is / are integrally connected to one or both of the opposing support webs. This design can prevent the spacers from becoming detached from the support webs due to the suction air flow, so that they cannot be carried by the air flow into other parts of the floor care device or at least partially block the suction air duct. Alternatively, the spacers can be separate from the support webs. This allows for a high degree of flexibility with regard to the number of spacers per support web pair, for example, if different floor care devices with different suction pressures are to be equipped with similar filter systems. The number of spacers can thus be varied depending on the expected suction pressure, which can result in cost reduction in the manufacturing process, for example if the expected suction pressure is low.For this purpose, the spacers can be simply snapped or glued to the support bars, for example.

[0027] In another preferred embodiment, the free space between the two groups of support webs is formed in that the webs of the first group and the webs of the second group lie in different parallel planes in the support element and the webs of the two groups are arranged offset from one another. In this embodiment of the invention, the planes of the groups of webs are rotated by an angle relative to one another or the webs are arranged offset from one another so that constrictions in the air channel between the filter material elements, which can possibly be caused if support webs from groups of support webs are located exactly opposite one another, can be reduced. In other words, in this embodiment, no longitudinal section of a support web from another group of support webs lies parallel to a longitudinal section along any support web.This allows another way for airflow to flow between the groups with low resistance to the exit opening, which can also improve aerodynamics.

[0028] It is preferred that one or more of the support webs have a substantially trapezoidal cross-section, with the shorter of the two parallel trapezoidal surfaces serving as the supporting surface for supporting the adjacent filter material element. This ensures particularly good supporting performance and, at the same time, the filter is well supported against the suction air flow, so that it can be pushed less or not at all by the suction air flow towards an opposite filter material element. At the same time, however, only a small filter surface is advantageously blocked by the support web shaped in this way. Alternatively, the cross-section of the support web can be rectangular, round, triangular, or elliptical. Such cross-sections are simple and cost-effective to manufacture. In principle, any conceivable cross-sectional shape can be used. Rounded cross-sectional edges can have a particularly noise-reducing effect.Alternatively, the longer of the two trapezoidal surfaces can be used to support the adjacent filter material element, for example to achieve an even greater support effect.

[0029] In a preferred embodiment, the shorter of the two parallel trapezoidal surfaces is curved. This allows the contact surface and thus the blocked filter area to be further reduced without significantly compromising the support capacity. Furthermore, the curvature can reduce the risk of the filter material element being damaged by the support web under load. Instead of being curved, however, the shorter of the two parallel trapezoidal surfaces can also be pointed, so that the trapezoidal shape is essentially converted into a triangular shape. This allows the inner surface of the filter material element blocked by the support web to be reduced and an increased flow area to be achieved.

[0030] It is preferred that in a filter system, two disc filter plates are spaced apart by means of a spacer element. The spacer element advantageously serves to seal the filter system between two disc filter plates. For this purpose, it is preferred that the spacer element is round-cylindrical in shape, particularly if the disc filter plate has a circular disc shape. It is further preferred that the inner diameter of the spacer element substantially corresponds to the inner diameter of the central opening of the inner ring of an adjacent disc filter plate. In a particularly preferred embodiment, sealing lips are formed or attached to one or both ends of the spacer element. These are preferably made of a softer or more elastic material than the spacer element itself, particularly preferably rubber.It is preferred that, in the assembled state of the spacer element, the sealing lips at one end of the spacer element rest on a filter material element of a first disc filter plate. It is further preferred that the sealing lips at the other end of the spacer element rest on a filter material element of a second disc filter plate. Thus, for example, in a floor care device, suction air exiting from an air outlet opening, for example of the first disc filter plate, can be passed through the spacer element, which is arranged between the disc filter plates, to the second disc filter plate and so on, and towards an air outlet opening of the floor care device.The spacer element can improve aerodynamics because air turbulence of incoming suction air between the filter material elements of two adjacent disc filter plates can be reduced and fewer or no leakage air flows of the cleaned suction air can penetrate to the outside between the individual disc filter plates or unfiltered air from outside can penetrate between the disc filter plates into the filter system. Brief description of the drawings

[0031] Further advantageous embodiments of the invention are described in more detail below with reference to exemplary embodiments shown in the drawings, to which the invention is not, however, limited.

[0032] They show schematically: Fig. 1 is an oblique plan view of a suction air filter system according to the invention with several disc filter plates; Fig. 2 a cross section through an embodiment of a suction air filter system according to Fig. 1 and a detailed section of such a suction air filter system; Fig. 3 a plan view of the inside of a disc filter plate according to the invention from a suction air filter system from filter 2 with a detailed view of an edge region of such a disc filter plate; Fig. 4 a perspective oblique view of a disc-shaped carrier element for a disc filter plate according to the invention according to the embodiment in Fig. 3; Fig. 5 cross sections and a top view of the support element according to Fig. 4; Fig. 6 a plan view and a perspective oblique view of another embodiment of a support element for a disc filter plate according to the invention; and Fig. 7 Cross sections and a detailed view through an embodiment of a support element for a disc filter plate according to the invention according to Fig. 6. Detailed description of embodiments of the invention

[0033] The Fig. 1 to 7 show various embodiments of disc filter plates and suction air filter systems according to the invention for a floor care device, and elements which are important for such disc filter plates, such suction air filter systems and such floor care devices.

[0034] Fig. Figure 1 shows a filter system 1 according to the invention for filtering dust-laden suction air. It comprises six circular disc-shaped disc filter plates 2. Therefore, it is particularly well suited for use in bagless vacuum cleaners, which implement dust separation according to the centrifugal principle and whose dust separation chamber is also often circular-cylindrical. The disc filter plates 2 are stacked on a mounting element 3 and surround it coaxially. The disc filter plates 2 each carry a filter material element 4 on their upper and lower sides. Two disc filter plates 2 are spaced from each other by means of a spacer element 5. The spacer element 5 is circular-cylindrical. At each of its ends, it comprises sealing elements 6, here in the form of rubber lips, which Fig. 2 can be seen more clearly. The sealing elements 6 prevent suction air from undesirably escaping or entering gaps between the disc filter plates 2, instead of entering the filter system 1 through the outer surfaces of the filter material elements 4 and flowing further inside the filter system 1 to the downstream exhaust opening of the floor care device (not shown).

[0035] If the filter system 1 is arranged for filtering suction air in a dust separation chamber (not shown) of a floor care device, suction air can, for example, flow tangentially into the dust separation chamber, enter the disc filter plates 2 through the outer surfaces of the filter material elements 4 and then flow further within the filter system 1 to the exhaust opening of the floor care device. For this purpose, inside the filter system 1, as shown in Fig. 2, a flow channel 7 is formed axially, to which the interior spaces of the disc filter plates 2 are connected via air outlet openings 8 and which can direct the suction air in the direction of the exhaust opening of the floor care device. The flow channel 7 itself is formed by the central openings 9 of the disc filter plates 2 and the adjoining spacer elements 5 between two disc filter plates 2. Arranged inside the flow channel 7 is the mounting element 3, which supports the disc filter plates 2 and can connect them to the floor care device via a coupling area 10. Via the coupling area 10, for example, a driving force can be transmitted to the filter system 1 in order to set it in rotation relative to the dust separation chamber of the floor care device.

[0036] In Fig. 2 is also the internal structure of a disc filter plate 2 of an exemplary filter system 1 according to the invention according to Fig. 1 in more detail. It can be seen that in this exemplary embodiment, each disc filter plate 2 comprises a two-part support element 11, on whose outwardly facing upper and lower sides, in the assembled state, filter material elements 4 are arranged. A group of support webs 12a, 12b for each filter material element 4 prevents the filter material elements 4 from being drawn by suction air towards the interior of the disc filter plate 2, which could block the suction air passage in or downstream of the filter system 1. In this exemplary embodiment, the support webs 12a, 12b are in turn stabilized against the suction air by spacers 13, wherein the spacers 13 are fastened to pairs of opposite support webs 12a, 12b that do not belong to the same support web group. The support webs 12a, 12b are columnar and have a circular-cylindrical shape.They occupy a relatively small space compared to the total internal volume of the disc filter plate 2. This ensures high stability of the disc filter plate 2 while simultaneously minimizing the impact on aerodynamics.

[0037] In Fig. Figure 3 shows a plan view of an inwardly facing side of a partial element of a two-part carrier element 11 for a previously described disc filter plate 2, with the aid of which details of this carrier element 11 will be explained below. Shown is a group of support webs 12b, which project radially in a spoke-like manner from a partial element of an inner ring 14 of the carrier element 11 and which are closed by a partial element of an outer ring 15 of the carrier element. This two-part carrier element 11 corresponds to the one shown in Fig. 2 can be seen in cross-section. The Fig. 4 and Fig. 5 show that between at least one support web 12a of a first group of support webs 12a, which serves as a support element for supporting a filter material element 4 arranged on a first surface of the carrier element 11, and at least one support web 12b of a second group of support webs 12b, which serves as a support element for supporting a filter material element 4 arranged on a second surface of the carrier element 11, a free space is formed in this carrier element 11 by spacing the groups apart from one another, so that filtered suction air can flow through this free space between the first group of support webs 12a and the second group of support webs 12b to the air outlet opening 8 of the disc filter plate 2.

[0038] In the construction shown, the support webs 12a, 12b of each group each lie in a common plane, and the two groups lie in mutually parallel planes. One support web 12a from the group for supporting a filter material element 4, which is arranged above a first outer surface of the support element 11, and one support web 12b from the group for supporting the filter material element 4, which is arranged above the second outer surface of the support element, are opposite each other, and the distance between the support webs 12a of the first group and the support webs 12b of the second group is bridged by a spacer 13. The spacer 13 is formed integrally with either of the two support webs 12a, 12b of the associated support web pair 12a, 12b. This further increases stability.

[0039] In the support element 11, the two groups of support webs 12a, 12b are located, as also in Fig. 4, from a circular disc-shaped inner ring 14, which has a central opening, radially outwardly in a spoke-like manner. The support webs 12a, 12b are closed radially outwardly by an outer ring 15, which defines the outer circumference of the circular disc-shaped disc filter plate 2. This simple construction allows for the production of a particularly lightweight disc filter plate 2, for example, by injection molding from a plastic. As shown in Fig. 3, the air outlet opening 8 in the present example is formed as a circumferential annular slot in the inner ring 14, and the opening cross-section of the annular slot is also kept constant by columnar spacers 13. In the present case, there are eight spacers 13 in the inner ring 14, which corresponds exactly to the number of radially outwardly projecting support webs 12a, 12b and is beneficial for aerodynamics because the annular slot can thus provide a constant flow area even under suction pressure, and the spacers 13, due to their shape and their advantageously small number, enable a virtually unhindered air flow. This can improve the acoustics, among other things, because noise caused by the passing suction air can be reduced.

[0040] The Fig. 4 and Fig. 5 further shows that the filter material element 4 can be glued to the carrier element 11, both at its inner ring 14 and at its outer ring 15. The outer ring 25 is provided with a step for this purpose. The filter material element 4 can be glued to the radially inner, stepped area 16 of the outer ring 15. If the thickness of the filter material element 4 is selected appropriately, its outer surface, which faces away from the carrier element 11, is flush with the upper edge 17, i.e., the radially outer, stepped area, of the outer ring. If the filter material element 4 is thus attached by gluing to the inner ring 14 and the outer ring 15, its surface is flush with the upper edge 17 of the outer ring 15 and is attached by gluing to the lower of the two steps formed on the outer ring 15.The outer edge of the filter material element 4 lies radially flush with the upper edge 17 of the outer ring to prevent air leakage. The inner ring 14, on the other hand, has a flat surface that is completely and evenly covered by the filter material element 4, allowing for particularly stable bonding across the entire surface of the inner ring 14. The bonding surface of the inner ring 14 and the stepped area 16 of the outer ring 15 lie in the same spatial plane. This allows a flat, even surface geometry to be achieved across the entire diameter of the disc filter plate 2. The described assembly method can significantly improve the aerodynamics of the disc filter plate 2.

[0041] A second embodiment of a disc filter plate 2 according to the invention is a variation of the carrier element 11 as shown in the Fig. 6 and Fig. 7. The support element 11 shown there is cast in one piece, and the free space between the two groups of support webs 12a, 12b is formed by the support webs 12a of the first group and the support webs 12b of the second group lying in different parallel planes in the support element 11, and the support webs 12a, 12b of the two groups being arranged offset from one another. In this specific case, for this purpose, the two groups are each rotated relative to one another in their arrangement plane about a common axis, which runs perpendicular to and centrally through the central openings of the support element 11, i.e. parallel to the mounting element 3. In this way, a construction can be created in which the use of spacers between the groups of support webs 12a, 12b can be dispensed with.With regard to attaching the filter material elements 4 to the support elements 11, the same options exist as in the previously described first embodiment. The structure of the support element 11 is also fundamentally comparable in both embodiments, so that features of the first embodiment can be combined arbitrarily with features of the second embodiment.

[0042] Advantageously, the support webs 12a, 12b, regardless of the embodiment, have a substantially trapezoidal cross-section, wherein the shorter of the two parallel trapezoidal surfaces is provided as a supporting surface for supporting the filter material element 4 lying therein, as shown by way of example in Fig.7. In this embodiment, the shorter of the two trapezoidal surfaces is curved. This allows the suction air flow through the filter material element 4 to be subjected to only minimal influence by the support webs 12, which can improve aerodynamics. This can also reduce flow noise.

[0043] The present disc filter plate 2, a filter system 1 for filtering suction air with one or more such disc filter plates 2, and a floor care device with such a filter system 1 can improve aerodynamics compared to the prior art. The suction air flow within the disc filter plate 2 can be improved by the groups of support webs 12a, 12b, while the suction air flow between two disc filter plates 2 can be improved by the spacer elements 5 with sealing elements 6. The economical use of material can enable a more cost-effective and lightweight disc filter plate 2. The spoke-like arrangement of the support webs 12a, 12b in the carrier disc 11, which can be stabilized by spacers 13 between pairs of support webs 12a, 12b, can achieve an improvement in the strength of the disc filter plate 2.The economical use of support webs 12a, 12b, their favorable arrangement, the advantageous shape and the improved sealing can reduce flow noise.

[0044] The features disclosed in the above description, the claims and the drawings may be important both individually and in any combination for the realization of the invention in its various embodiments. List of reference symbols 1 filter system 2 disc filter plates 3 Mounting element 4 Filter material element 5 spacer element 6 Sealing element 7 flow channel 8 air outlet(s) 9 Central opening 10 Coupling area 11 Support element 12a, 12b Support bridge 13 spacers 14 inner ring 15 Outer ring 16 graded area 17 top edge

Claims

[1] Disc filter plate (2) for a filter system (1) for filtering suction air from a floor care device, comprising a disc-shaped support element (11) and one or more filter material elements (4) on a first and a second surface of the support element (11), through which suction air can flow into the disc filter plate (2), and one or more air outlet openings (8) through which the filtered suction air can flow out of the disc filter plate (2), wherein a first group of support webs (12a) as a support element for supporting a filter material element (4) arranged on the first surface of the support element (11), and a second group of support webs (12b) as a support element for supporting a filter material element (4) arranged on the second surface of the support element (11), which serve to support the at least one filter material element (4), characterized bythat a free space is formed between at least one support web (12a) of the first group and at least one support web (12b) of the second group by spacing the groups apart from one another, so that suction air filtered by the filter material element (4) can flow through this free space between the first group of support webs (12a) and the second group of support webs (12b) to the air outlet opening (8) or the air outlet openings (8) of the disc filter plate (2), wherein the disc filter plate (2) is designed as a circular disc and wherein, in its carrier element (11) in the circular disc, the two groups of support webs (12a, 12b) project radially outwards in the manner of spokes from a circular disc-shaped inner ring (14), which has a central opening (9) and at least one air outlet opening (8), and terminate with an outer ring (15) delimiting the outer circumferential line of the circular disc-shaped disc filter plate (2). [2] Disc filter plate (2) according to claim 1, characterized by that the support webs (12a, 12b) of at least one of the groups essentially lie in a common plane. [3] Disc filter plate (2) according to claim 1 or 2, characterized by that the filter material element(s) (4) are attached to the inner ring (14) and / or the outer ring (15). [4] Disc filter plate (2) according to claim 3, characterized by that a surface of at least one filter material element (4) facing away from its carrier element (11) is flush with an upper edge (17) of the outer ring (15). [5] Disc filter plate (2) according to one of the preceding claims, characterized bythat in each case a support web (12a) from the group for supporting a filter material element (4), which is arranged above a first outer surface of the carrier element, is opposite a support web (12b) from the group for supporting the filter material element (4), which is arranged above the second outer surface of the carrier element (11), and that the distance between the support webs (12a) of the first group and the support webs (12b) of the second group is bridged by one or more spacers (13). [6] Disc filter plate (2) according to one of claims 1 to 4, characterized by that the free space between the two groups of support webs (12a, 12b) is formed in that the support webs (12a) of the first group and the support webs (12b) of the second group lie in different parallel planes in the carrier element (11) and the support webs (12a, 12b) of the two groups are arranged offset from one another. [7] Disc filter plate (2) according to one of the preceding claims, characterized by that one or more of the support webs (12a, 12b) have a substantially trapezoidal cross-section, wherein the shorter of the two parallel trapezoidal surfaces is provided as a supporting surface for supporting the filter material element (4) lying thereon. [8] Disc filter plate (2) according to claim 7, characterized by that the shorter of the two parallel trapezoidal surfaces is curved. [9] Filter system (1) for filtering suction air, comprising one or more disc filter plates (2) according to claim 1. [10] Filter system (1) according to claim 9, characterized by that two disc filter plates (2) are spaced apart from each other by means of a spacer element (5). [11] Floor care device with a filter system (1) according to claim 9 or 10.

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