Separation unit and vacuum cleaner with a separation unit

Abstract

The invention relates to a separation unit (4) for a vacuum cleaner for separating dust and dirt particles from an airflow, wherein the separation unit (4) has a pre-filter (5) downstream of a cyclone separator, wherein the separation unit (4) has a fine dust filter (6) downstream of the pre-filter (5), wherein a filter material of the fine dust filter (6) is configured to separate dust and dirt particles from an airflow, wherein a mechanical cleaning device (9) is arranged on the fine dust filter, wherein the fine dust filter (6) and the cleaning device (9) are configured to perform a rotational movement relative to each other, wherein the cleaning device (9) has a cleaning axis (10) with a pulse generator (11).wherein the pulse generator (11) is configured to exert a pulse on the filter material of the fine dust filter (6) from the rotational movement, dislodging dust and dirt particles, wherein the fine dust filter (6) is arranged in a filter cassette (12) of the pre-filter (5), wherein a sweeping device (13) is arranged in the filter cassette (12) of the pre-filter (5), wherein the sweeping device (13) is configured to perform a sweeping movement (14) as a result of the rotational movement between the fine dust filter (6) and the cleaning device (9), wherein by means of the sweeping movement (14) dust and dirt particles dislodged from the fine dust filter (6) are swept out of the filter cassette (15) through an opening (15) in the filter cassette (12).

Description

[0001] The invention relates to a separation unit for a vacuum cleaner for separating dust and dirt particles from an airflow, wherein the separation unit has a pre-filter downstream of a cyclone separator, wherein the separation unit has a fine dust filter downstream of the pre-filter, wherein a filter material of the fine dust filter is configured to separate dust and dirt particles from an airflow, wherein a mechanical cleaning device is arranged on the fine dust filter, wherein the fine dust filter and the cleaning device are configured to perform a rotational movement relative to each other, wherein the cleaning device has a cleaning axis with a pulse generator, wherein the pulse generator is configured to exert a dust and dirt particle-dislodging pulse on the filter material of the fine dust filter from the rotational movement.the fine dust filter is arranged in a filter cassette of the pre-filter.

[0002] Vacuum cleaners are used in private households and commercial settings to clean surfaces such as textile floor coverings and smooth floors. To pick up dust, a vacuum cleaner nozzle designed as a floor nozzle is continuously moved back and forth across the floor surface.

[0003] US Patent 2007186372 A1 discloses a vacuum cleaner with a separation unit for separating dust and dirt particles from an airflow, wherein the separation unit has a pre-filter downstream of a cyclone separator, wherein the separation unit has a fine dust filter downstream of the pre-filter, wherein a filter material of the fine dust filter is configured to separate dust and dirt particles from an airflow, and wherein a mechanical cleaning device is arranged on the fine dust filter, and wherein the fine dust filter and the cleaning device are configured to perform a rotational movement relative to each other.

[0004] Furthermore, cleaning systems using cordless stick vacuums are known from the prior art. For example, the applicant currently markets a vacuum cleaner called "Triflex HX1," which uses a separation unit as described above. A disadvantage of the cleaning system described here is that the loosened dirt is stirred up when the housing is emptied, which is unhygienic and poses a problem for allergy sufferers. In addition, some fine dust and dirt particles remain in the filter cartridge and must be emptied manually.

[0005] However, a vacuum cleaner according to the invention with a separation unit according to the invention can also be an autonomous cleaning device, such as a robotic vacuum cleaner or a robotic vacuum and mop. Furthermore, a vacuum cleaner according to the invention with a separation unit according to the invention can also be a combined vacuum and mop device.

[0006] The invention therefore addresses the problem of providing an improved separation unit. In particular, the emptying of the separation unit should be simplified and the handling of the dirt released from the filter material during cleaning should be improved.

[0007] According to the invention, this problem is solved by a separation unit with the features of claim 1 and by a vacuum cleaner with the features of claim 11. By arranging a sweeping device in the filter cassette of the pre-filter, the sweeping device being configured to perform a sweeping motion as a result of the rotational movement between the fine dust filter and the cleaning device, whereby dust and dirt particles loosened from the fine dust filter are swept out of the filter cassette through an opening in the filter cassette by means of this sweeping motion, the filter cassette can be hygienically emptied by the sweeping device simultaneously with the cleaning of the filter material. The mechanical cleaning device allows the separated fine dust to be easily removed from the filter material of the fine dust filter.The cylinder of the fine dust filter is traversed from the outside to the inside by the suction airflow, which then exits the filter axially upwards. The cleaning device is located within the fine dust filter and features a cleaning axis that rotates relative to the central filter element to loosen adhering dirt. The cleaning axis is preferably positioned centrally within the cylinder of the fine dust filter, ensuring that the cylinder is equidistant from the cleaning axis. This allows the pulse generator located on the cleaning axis to effectively reach the filter material of the fine dust filter on the cylinder. In a preferred embodiment, the filter material of the fine dust filter is pleated within the filter cartridge. The pulse generator, through the rotation of the cleaning axis relative to the fine dust filter, exerts pulses on the filter material of the fine dust filter, dislodging the dirt adhering to it.The loosened dirt collects at the bottom of the pre-filter's cylindrical filter cartridge. The filter cartridge is positioned within the separation unit in such a way that a space is created beneath it for the collection of dust and dirt particles. Using the sweeping device inside the pre-filter cartridge, the loosened dirt can be easily and hygienically swept out through an opening in the bottom of the cartridge. This is achieved simply by utilizing the rotational movement of the cleaning shaft or the fine dust filter relative to the pre-filter suspended within the housing. The rotational movement of the cleaning device relative to the fine dust filter thus creates a sweeping motion. This sweeping motion sweeps the dirt loosened from the fine dust filter by the cleaning device through at least one lower opening in the bottom of the filter cartridge.

[0008] The preferably handheld vacuum cleaner has a fan to generate a vacuum, which draws dust and dirt from the floor surface via the floor nozzle, which is guided over the area to be cleaned. For this purpose, the suction nozzle, designed as a floor nozzle, is moved back and forth by the user using push and pull motions in the direction of cleaning. This allows the floor nozzle to glide over the floor surface. Particularly with high-pile carpets, the underside of the floor nozzle glides over the carpet, while on smooth floors, the underside hovers above the surface, possibly with the aid of spacer bristles. The user can, for example, use a handle of the vacuum cleaner to control this movement. To ensure the most effective cleaning and maintenance of the floor covering, the suction opening of the floor nozzle is elongated and runs essentially perpendicular to the direction of cleaning.In this context, "elongated" means that the preferably essentially rectangular suction opening has a greater length transverse to the machining direction than its width in the machining direction. The suction opening is preferably between 20 and 30 cm long transverse to the machining direction.

[0009] Advantageous embodiments and further developments of the invention are set forth in the dependent claims. It should be noted that the features listed individually in the claims can also be combined with one another in any technologically meaningful way, thus revealing further embodiments of the invention.

[0010] According to an advantageous embodiment of the invention, the opening of the filter cartridge leads into a flow-stabilized area within the housing, where loosened dirt collects. In this flow-stabilized area, the fine dust loosened by the fine dust filter through the cleaning device can be collected without being drawn into the suction airflow. The flow-stabilized area is located below the filter cartridge of the pre-filter. The suction airflow in the flow-stabilized area is lower than the suction airflow at the filter material of the pre-filter, so that the fine dust collected here is not carried along by the suction airflow.

[0011] A preferred embodiment of the invention provides that the flow-stabilized area is formed by a fine dust collection chamber connected to the filter cassette. The formation of a separate fine dust collection chamber, in which the fine dust released by the fine dust filter can be collected separately from coarser dirt, particularly reliably prevents the fine dust from being carried along by the suction airflow. The dirt released by the fine dust filter is simply swept into the fine dust collection chamber by the sweeping device and thus is not captured again by the suction airflow and does not need to be separated again by the fine dust filter.

[0012] A particularly advantageous aspect of the invention is that the fine dust collection chamber is surrounded by a coarse dust collection chamber of the separation unit, which is arranged upstream of the pre-filter in the suction airflow. With the fine dust collection chamber arranged centrally in the coarse dust collection chamber, the fine dust separated by the fine dust filter and swept from the filter cassette by the sweeping device can be easily collected separately from the coarse dirt that was separated from the suction airflow by the pre-filter upstream of the fine dust filter. In an alternative embodiment, the fine dust collection chamber can also be arranged eccentrically in the coarse dust collection chamber.

[0013] A further advantage of the invention is that the fine dust collection chamber and the coarse dust collection chamber can be opened together for emptying via a lid of the separation unit. The lid of the separation unit is located on the underside of the fine dust collection chamber and the coarse dust collection chamber surrounding it, and can be easily opened to empty the separation unit of the collected dust. Simultaneous emptying of the fine dust collection chamber and the coarse dust collection chamber by opening the common lid significantly simplifies the handling of the separation unit and improves hygiene.

[0014] An advantageous embodiment of the invention provides that the sweeping device is connected to the rotating cleaning axis and performs a rotating sweeping motion on the bottom of the filter cassette. The fine dust filter connected to the filter cassette is cleaned of the separated fine dust by the rotation of the cleaning axis, which is driven by the pulse generators. The rotation of the cleaning axis, through its connection to the sweeping device, can simultaneously be used to perform the rotating sweeping motion on the bottom of the filter cassette. In this way, the fine dust separated from the fine dust filter, which collects at the bottom of the filter cassette after being detached from the filter material by the cleaning device, is swept out of the filter cassette through the lower opening.

[0015] According to an advantageous embodiment of the invention, the sweeping device is connected to the fine dust filter, which rotates relative to the filter cassette, and performs a rotating sweeping motion at the bottom of the filter cassette. The cleaning shaft connected to the housing ensures cleaning by the pulse generator through the rotation of the fine dust filter. By connecting the rotating fine dust filter to the sweeping device, the rotational movement can simultaneously be used to perform the rotating sweeping motion at the bottom of the filter cassette. Thus, the fine dust separated by the fine dust filter, which collects at the bottom of the filter cassette after being detached from the filter material by the cleaning device, is swept out of the filter cassette through the lower opening.

[0016] A particularly advantageous aspect of the invention is that the sweeping device comprises a disc with brush strips and / or rubber lips and / or plastic ribs arranged on its underside. With sweeping elements in the form of brush strips and / or rubber lips and / or plastic ribs, the sweeping device can effectively sweep the fine dust separated by the fine dust filter out of the filter cassette through its sweeping motion. The disc of the sweeping device ensures that fine dust that has fallen to the bottom of the filter cassette is not stirred up by the sweeping motion of the device to such an extent that the fine dust has to be separated again by the fine dust filter.

[0017] An advantageous embodiment of the invention provides that the disc is circular and the brush strips and / or rubber lips and / or plastic ribs have a radial extension, and the sweeping motion of the brush strips and / or rubber lips and / or plastic ribs is circular. With the radial extension of the sweeping elements, the fine dust released by the fine dust filter can be easily swept through the lower opening in the base of the filter cartridge in a circular sweeping motion. If the opening in the base of the filter cartridge is located centrally below the fine dust filter, the brush strips and / or rubber lips and / or plastic ribs can also be oriented obliquely towards the center of the disc in order to sweep the dirt released by the fine dust filter towards the center of the opening in the base. In an alternative embodiment, the opening in the base of the filter cartridge can also be arranged eccentrically.

[0018] According to an advantageous embodiment of the invention, the lower opening in the base of the filter cassette is formed by a porous plate. The fine dust released by the fine dust filter can easily be swept through this porous plate.

[0019] Further features, details, and advantages of the invention will become apparent from the following description and the drawings. Exemplary embodiments of the invention are shown purely schematically in the following drawings and are described in more detail below. Corresponding objects or elements are designated with the same reference numerals in all figures. It shows Figure 1: Separation unit according to the invention in a first embodiment, Figure 2: Sectional view through a separation unit, Figure 3: Perspective view of a disc with sweeping elements, Figure 4: Sectional view of the filter cassette, Figure 5: Separation unit according to the invention in a second embodiment, Figure 6: Sectional view through a separation unit, Figure 7: Sectional view through a separation unit according to the invention in a third embodiment, and Figure 8: Perspective view of a fine dust filter.

[0020] In the figures designated by reference numeral 1, a separation unit 1 according to the invention is shown purely schematically. The representation according to Figure 1 The separator unit for cleaning and maintaining floor surfaces is shown in its first version.

[0021] The separation unit 1 shown is designed to be inserted into a vacuum cleaner and to clean the generated suction airflow of captured dust and dirt particles. The direction of the suction airflow in the separation unit is Figure 1 indicated by block arrows. The separation unit 4 has a pre-filter 5 and a fine dust filter 6 arranged downstream of the pre-filter 5. The suction airflow 3 is directed laterally into the separation unit via a Figure 1 Air is drawn into the housing 2 of the separation unit through a concealed inlet opening and axially discharged from the cylindrical housing 2 via an upper outlet opening 24. The filter material 7, 8 of the filters 5, 6 is thereby passed through by the suction air stream 2 to separate dirt from the suction air stream.

[0022] The Figure 2 shows a cross-sectional view through the separation unit 1 according to Figure 1This sectional view also shows a mechanical cleaning device 9 for removing dirt adhering to the filter material 8 of the fine dust filter 6. The filter material 8 of the fine dust filter 6 is pleated. The filter material 7 of the pre-filter 5 is preferably made of gauze or perforated sheet metal. The fine dust filter 6 is designed to allow the suction airflow 3 to pass through it. Furthermore, the fine dust filter 6 is cylindrical, although only one half of the cylinder is visible in the sectional view. The cleaning device 9 associated with the fine dust filter 6 serves to remove dirt adhering to the filter material 8 of the fine dust filter 6. The cleaning device 9 has a cleaning axis 10 that rotates relative to the central fine dust filter 6. This axis is equipped with pulse generators 11, which are designed to exert pulses on the filter material 8 of the fine dust filter 6 from the rotational movement, thereby dislodging the adhering dirt.The fine dust filter 6 is arranged in a cylindrical filter cassette 12 of the pre-filter 5. The filter cassette 12 is suspended in the housing 2, as shown in . Figure 2 to be seen. In the filter cassette 12 of the pre-filter 5, a sweeping device 13 is arranged, which is configured to perform a sweeping motion 14 from the rotary movement of the cleaning device 9 relative to the fine dust filter 6, which is indicated by dashed arrows. With the sweeping motion 14, dirt loosened from the fine dust filter 6 by the cleaning device 9 is expelled through a lower opening 15 ( Fig. 4) in the base 16 of the filter cassette 12. The lower opening 15 is provided with a dust-permeable medium, such as a perforated sheet or gauze. A sweeping motion 14 is derived from the rotary movement of the cleaning device 9 relative to the fine dust filter 6, whereby this sweeping motion 14 sweeps the dirt loosened by the fine dust filter 6 from the base 16 of the filter cassette 12 through a lower opening 15 ( Fig. 4 ) is swept. This allows the filter cassette 12 to be hygienically emptied simultaneously with the cleaning of the filter material 8 of the fine dust filter 6 by the sweeping device 13.

[0023] The lower opening 15 of the filter cassette 13 leads into a collection area 17 in the housing 2, which is located below the pre-filter 5. Loose dirt that falls out of the filter cassette 13 through the lower opening 15 collects in the collection area 17. In the embodiment shown here, the sweeping device 13 is connected to the cleaning axis 20, which rotates relative to the housing 2. The sweeping device 13 thus performs a rotating sweeping motion 14 on the bottom 16 of the filter cassette 12. The fine dust filter 6, which is connected to the housing 2, is cleaned by the pulse generators 11 through the rotation of the cleaning axis 10 and freed from the separated fine dust. For this purpose, the pulse generators 11 engage the pleats of the filter material 8 of the fine dust filter 6. The rotation of the cleaning axis 10 is simultaneously used to perform the rotating sweeping motion 14 on the bottom 16 of the filter cassette 12. The fine dust separated by the fine dust filter 6 is thus expelled through the lower opening 15 ( Fig. 4 ) swept out of the filter cassette 12 as soon as it collects at the bottom 16 of the filter cassette 12 after being detached from the filter material 8 of the fine dust filter 6 by the cleaning device 9.

[0024] The Figure 3 Figure 1 shows a disc 21 of the sweeping device 13 in a close-up view from below. The disc of the sweeping device 13 serves to support the sweeping elements 22. As shown in Figure 2 Figure 3 As can be seen, the disc 21 forms a gap 25 at its edge to the filter cassette 12, through which the fine dust released by the fine dust filter 6 can fall under the disc 21. Between the base 16 ( Fig. 2 ) and the side wall 26 ( Fig. 2 ) the filter cassette 12 is by the way a chamfer 27 ( Fig. 2 ) provided, which directs the fallen fine dust to the center in front of the sweeping elements 22. The disc 21 is provided with brush strips 22 and / or rubber lips 22 and / or plastic ribs 22 on the underside. Thus, the fine dust filter 6 ( Fig. 2) effectively removes fine dust particles from the filter cassette 12 ( Fig. 2 ) be swept. The disc 21 can be connected to the filter cassette via the coupling area 29. Via a in Figure 3 The coupling element not shown, located on the top of disc 21, connects it to the cleaning axis.

[0025] The disc 21 is circular, and the brush strips 22, rubber lips 22, and plastic ribs 22 have a radial extension, so that the sweeping motion 14 of the brush strips 22, rubber lips 22, and plastic ribs 22 is circular. The radial extension of the sweeping elements 22 enables a simple sweeping motion 14 of the fine dust released by the fine dust filter 6 through the lower opening 15 in the base 16 of the filter cassette 12 – and this in a circular shape. The brush strips 22, rubber lips 22, and / or plastic ribs 22 can also be oriented obliquely towards the center on the disc 21 if the opening 15 in the base 16 of the filter cassette 12 is located centrally below the fine dust filter 6. In this way, the dirt released by the fine dust filter 6 is directed towards the center towards the opening 15 ( Fig. 4 ) swept in the ground 16. Alternatively, the sweeping elements can also be arranged in a semicircular or pointed arrangement on the disc 21.

[0026] In Figure 4The underside of the filter cassette 12 is visible. The lower opening 15 in the base 16 of the filter cassette 12 is formed by a porous plate 23. This porous plate 23 covers several lower openings in the filter cassette 12. This design allows the fine dust released by the fine dust filter 6 to be easily swept through the lower opening 15.

[0027] The Figure 5 Figure 1 shows a second embodiment of the separation unit 1, the only difference being that a flow-stabilized area 17 is formed by a fine dust collection chamber 18 adjoining the filter cassette 12. Similar to the Figure 1The housing 2 is at least partially shown, as it has been cut open around half of the cylindrical shell for better understanding. The formation of a separate fine dust collection chamber 18, in which the fine dust released by the fine dust filter 6 can be collected separately from coarser dirt, ensures particularly reliable prevention of the fine dust being carried along by the suction airflow 3. The dirt released by the fine dust filter 6 is swept into the fine dust collection chamber 18 by the sweeping device 13, so that it is not captured again by the suction airflow 3 and does not have to be separated again by the fine dust filter 6.

[0028] In Figure 6A cross-sectional view through the separation unit is shown. The section through the fine dust collection chamber 18 reveals that it is surrounded by a coarse dust collection chamber 19 of the housing 2, which is located upstream of the pre-filter 5 in the suction airflow 3. The fine dust collection chamber 18, centrally located within the coarse dust collection chamber 19, allows for the separate collection of the fine dust separated by the fine dust filter 6, loosened by the cleaning device 9, and swept from the filter cassette 12 by the sweeping device 13. This allows for easy separation from the coarse dirt that was separated from the suction airflow 3 by the pre-filter 5 upstream of the fine dust filter 6. The fine dust collection chamber 18 and the coarse dust collection chamber 19 can be opened together for emptying via a cover 20 of the housing 2.The cover 20 of the housing 2 is located on the underside of the fine dust collection chamber 18 and on the underside of the coarse dust collection chamber 19 surrounding the fine dust collection chamber 18. The cover 20 can be easily opened to empty the housing 2 of the collected dust. Simultaneous emptying of the fine dust collection chamber 18 and the coarse dust collection chamber 19 by opening the shared cover 20 optimizes the handling of the separation unit 1 and improves hygiene. The cover 20 is sealed to the housing 2 by a rubber seal.

[0029] In Figure 7A sectional view through a separation unit 1 according to a third embodiment is shown, the only difference being that the sweeping device 13 is connected to the fine dust filter 6, which rotates relative to the housing 2, and performs a rotating sweeping motion 14 on the bottom 16 of the filter cassette 12. The cleaning axis 10 is rigidly arranged in the filter cassette 12. A fourth embodiment of the separation unit 1 according to the invention, combining the differences between the second and third embodiments, is possible. The cleaning axis 10, connected to the housing 2, ensures effective cleaning by means of the pulse generators 11 through the rotation of the fine dust filter 6. The rigid connection of the rotating fine dust filter 6 to the sweeping device 13 enables the simultaneous execution of the rotating sweeping motion on the bottom 16 of the filter cassette 12.The fine dust separated by the fine dust filter 6 is swept out of the filter cassette 12 through the lower opening 15 as soon as it collects at the bottom 16 of the filter cassette 12 after being detached from the filter material 8 of the fine dust filter 6 by the cleaning device 9. In the embodiment shown here, the disc 21 of the sweeping device 13 simultaneously serves as the lower end of the fine dust filter 6, with the filter material 8 being attached to the disc 21.

[0030] As from Figure 8 As can be seen, the fine dust filter consists of 6 parts. Figure 7On the underside of the disc 21, several brush strips 22 and / or rubber lips 22 and / or plastic ribs 22 of the sweeping device 13 are arranged. A toothed ring 27 is arranged on the upper side of the fine dust filter 6, via which the fine dust filter 6 and the sweeping device 13 can be driven to rotation. In the first embodiment, a handle 28 is molded onto the cleaning axis 10 for driving its rotation.

[0031] Of course, the invention is not limited to the illustrated embodiments. Further embodiments are possible without departing from the basic concept. Reference symbol list

[0032] 2 Housing 3 Suction airflow 4 Separation unit 5 Pre-filter 6 Fine dust filter 7 Filter material (pre-filter) 8 Filter material (fine dust filter) 9 Cleaning device 10 Cleaning shaft 11 Pulse generator 12 Filter cassette 13 Sweeping device 14 Sweeping movement 15 Lower opening 16 Bottom (filter cassette) 17 Flow-stabilized area 18 Fine dust collection chamber 19 Coarse dust collection chamber 20 Cover 21 Disc 22 Brush strips and / or rubber lips and / or plastic ribs 23 Porous plate 24 Discharge opening 25 Gap 26 Side wall 27 Toothed ring 28 Handle 29 Coupling area

Claims

1. Separation unit (4) for a vacuum cleaner for separating dust and dirt particles from an airflow, wherein the separation unit (4) has a pre-filter (5) downstream of a cyclone separator, wherein the separation unit (4) has a fine dust filter (6) downstream of the pre-filter (5), wherein a filter material of the fine dust filter (6) is configured to separate dust and dirt particles from an airflow, wherein a mechanical cleaning device (9) is arranged on the fine dust filter, wherein the fine dust filter (6) and the cleaning device (9) are configured to perform a rotational movement relative to each other, wherein the cleaning device (9) has a cleaning axis (10) with a pulse generator (11), wherein the pulse generator (11) is configured to exert a pulse on the filter material of the fine dust filter (6) from the rotational movement, dislodging dust and dirt particles.wherein the fine dust filter (6) is arranged in a filter cassette (12) of the pre-filter (5), wherein a sweeping device (13) is arranged in the filter cassette (12) of the pre-filter (5), wherein the sweeping device (13) is designed to perform a sweeping motion (14) as a result of the rotational movement between the fine dust filter (6) and the cleaning device (9), wherein by means of the sweeping motion (14) dust and dirt particles released from the fine dust filter (6) are swept out of the filter cassette (15) through an opening (15) in the filter cassette (12).

2. Separation unit (4) according to claim 1, characterized by the fact that the opening (15) leads from the filter cassette (12) into a flow-calmed area (17) into the separation unit (4) where dissolved dirt collects.

3. Separation unit (4) according to claim 2, characterized by the fact that the flow-calmed area (17) is formed by a fine dust collection chamber (18) adjoining the filter cassette (12).

4. Separation unit (4) according to claim 3, characterized by the fact that the fine dust collection chamber (18) is surrounded by a coarse dust collection chamber (19) of the separation unit (4), which is arranged upstream of the pre-filter (5) in the suction air stream (3).

5. Separation unit (4) according to claim 4, characterized by the fact that The fine dust collection chamber (18) and the coarse dust collection chamber (19) can be opened together via a lid (20) of the separation unit (4) for emptying.

6. Separation unit (4) according to any one of the preceding claims, characterized by the fact that the sweeping device (13) is connected to the cleaning axis (10) and performs a rotary sweeping motion (14) on the bottom (16) of the filter cassette (12).

7. Separation unit (4) according to one of claims 1 to 5, characterized by the fact that the sweeping device (13) is connected to the fine dust filter (6) which rotates relative to the filter cassette (12) and performs a rotating sweeping motion (14) on the bottom (16) of the filter cassette (12).

8. Separation unit (4) according to any one of the preceding claims, characterized by the fact that the sweeping device (13) comprises a disc (21) which has brush strips (22) and / or rubber lips (22) and / or plastic ribs (22) arranged on the underside.

9. Separation unit (4) according to claim 8, characterized by the fact that the disc (21) is circular and the brush strips (22) and / or rubber lips (22) and / or plastic ribs (22) have a radial extension and the sweeping movement (14) of the brush strips (22) and / or rubber lips (22) and / or plastic ribs (22) is circular.

10. Separation unit (4) according to one of the preceding claims, characterized by the fact that the lower opening (15) in the base (16) of the filter cassette (12) is formed by a porous plate (23).

11. Vacuum cleaner with a separation unit (4) according to one of the preceding claims.

Images