EP2510851A2 - Filter device and method for low-noise filtering of a waste air flow - Google Patents

Abstract

The apparatus (10) has a housing (13) for receiving a filter assembly (12) downstream to an inlet (14) of the housing. The housing comprises an outlet (15) for exhaust stream (11) received downstream to the filter assembly. The outlet is coupled with a relaxation region (17) for the exhaust stream, and air circulation ribs (16) are arranged downstream to the outlet. The air circulation ribs are arranged in a transition region by the outlet, and are parallel to each other in the relaxation region. An independent claim is also included for a method for cleaning an exhaust stream in a household appliance.

Description

TECHNICAL AREA

Embodiments of the present invention relate to an apparatus and a method for cleaning or filtering an exhaust air stream by means of an air filter, such as. B. in household appliances, in particular, but not exclusively, vacuum cleaners, can be used.

STATE OF THE ART

For removing dust from an exhaust air flow of a household appliance, such. As a vacuum cleaner, various filter arrangements are known. Such exhaust air filter assemblies generally include an air or particulate filter disposed within a filter housing. Often, two or three filter stages are arranged in series in a filter assembly to maximize a quantity of dust collected by the filter assembly.

Known exhaust filter types include, for example, a foam filter, which is arranged directly in the exhaust air flow and in itself has a relatively large dust retention capacity. An electric and / or HEPA (High Efficiency Particulate Air Filter) capable of collecting very small particles of dust, especially particles smaller than 1 μm, can then be placed downstream of the foam filter. to retain or filter out of the exhaust air flow those residual dust that escaped the upstream foam filter.

In addition to filtering out the finest dust particles, it is also possible with known filter devices to improve the odor of the exhaust air of a vacuum cleaner. With, for example, when vacuuming dust recorded even microorganisms such. B. bacteria or house dust mites get into the dust filter of a vacuum cleaner, especially in the dust filter bag. A massive accumulation of all impurities in the dust filter bag and possibly also in the after- and exhaust air filter accelerates and intensifies the growth and the multiplication of the mites and bacteria, as well as their excrement formation, whereby a moisture content in the filters can disadvantageously increase with the additional formation of a warm, moist atmosphere. Due to the then accelerated decomposition processes, an unpleasant odor can develop, especially in the dust filter bag, which can pollute the ambient air when vacuuming.

In addition to dust and odor nuisances it comes when blowing exhaust air by means of a motor-blower unit upstream or downstream arranged to conventional filter arrangements often also considerable noise nuisance, which u. a. caused by diffuse Luftverwirbelungen or turbulent flow conditions in and after conventional filter arrangements. Especially in everyday activities such as vacuuming, it would be desirable to keep such noise levels as low as possible.

The US 5,289,612 refers to a noise reduction system for an upright vacuum cleaner. The EP 1 649 796 A2 refers to a suction device. Also the DE 29 17 094 refers to a device for soundproofing in a vacuum cleaner. The EP 1 551 269 B1 refers to noise attenuation arrangement for a vacuum cleaner. The US 2010/0212104 A1 Finally, it relates to a filter chamber construction for a surface cleaning device, which operates on the cyclone principle.

PRESENTATION OF THE INVENTION

It is therefore an object of the present invention, noise or noise in a Abluftausblasbereich especially in household appliances, such. As vacuum cleaners to reduce.

A realization of embodiments of the present invention is, downstream of a motor-blower unit, a filter assembly having an air or particulate filter, such as a HEPA filter, in a dedicated filter housing, e.g. As a vacuum cleaner to arrange, and rectify a blown out of the filter assembly in the downstream direction, filtered exhaust air downstream of the filter assembly downstream air guide ribs before it is passed through a the air ducts downstream downstream relaxation room calmed out. An exhaust air filter assembly housed in a housing are according to Embodiments thus downstream of air guide or air guide ribs and a Abluftentspannungs- or expansion area for noise reduction.

For this purpose, embodiments provide a filter device for cleaning an exhaust air stream by means of a filter assembly, comprising a filter housing for receiving the filter assembly downstream to an exhaust air inlet of the filter housing. The filter housing has an exhaust air outlet downstream of the filter assembly receivable therein, the exhaust air outlet being coupled through a plurality of air guide ribs to a discharge air stream expansion region located downstream of the exhaust air outlet. By the filter arrangement in or on the filter housing downstream Luftleitrippen and connected to the housing relaxation space a noise in the discharge of the filter device can be advantageously reduced. From a diffuse or turbulent air flow, which flows out of the filter assembly located in the housing, a rectified (laminar) exhaust air flow can be generated in particular by the downstream Luftleitrippen a rectified or laminar and / or by means of the relaxation space.

There is also provided a method of cleaning an exhaust air stream, comprising a step of providing a filter housing for housing a filter assembly, the filter housing having an inlet and downstream of the inlet an outlet for the exhaust air stream, the outlet having a plurality of air guide fins Downstream of the outlet arranged relaxation area for the exhaust air flow is coupled. The filter assembly is placed in the filter housing between the inlet and the outlet.

According to exemplary embodiments, the expansion region of the filter housing arranged downstream of the air guide ribs is substantially funnel-shaped such that it widens in a downstream direction from the exhaust airflow outlet, ie from a narrower start of the relaxation region, to a wider end of the expansion region. The end of the relaxation area is directed to an outlet for the laminar, relaxed and / or soothed exhaust air from the home appliance to deliver the exhaust air to the environment. By a substantially funnel-shaped shaping of the relaxation area, the previously by the Luftleitrippen rectified exhaust air flow during outflow to the outside particularly advantageous continuously relax and thus calm.

In some embodiments, the air guide ribs are arranged in a transition region from the Abluftstromauslass in the housing to the relaxation area substantially parallel to each other to rectify the flowing from the housing to the relaxation area diffuse exhaust air by means of the air guide ribs, i. to obtain a laminar flow as possible. In principle, arbitrary alignments of the parallel air guide ribs can be provided.

Preferably, the housing, the air guide ribs and the relaxation area are integrally formed. That is, the housing, the air guide fins, and the expansion area together form an integral blow-out area for the exhaust air stream filtered by the filter assembly. The one-piece blow-out region encompassing the housing, the air-guiding ribs and the relaxation region can be produced in particular by means of a plastic injection molding process. By integrally or one-piece design can on the one hand a complicated assembly of the blow-out be avoided, on the other hand, increased noise can be avoided by, for example, loose parts. Also, it can come through the one-piece design to no unwanted turbulent air turbulence by incorrectly connected items or resulting columns.

In the housing of the filter device according to embodiments, a filter assembly may be arranged with an air filter having on a downstream side of the air filter a circumferentially disposed air guide rib which is adapted to the exhaust air flow from the air filter to a stomabwärts arranged in series with the air filter air-permeable sound absorber to lead. That is, air filter, air guide rib and sound absorber together form the filter assembly. In this case, serve as an air-permeable sound absorber, for example, a sound-absorbing layer, which, for example, a sound-absorbing fleece or a sound-absorbing foam such. B. a melamine resin foam may have. In embodiments, the sound absorber of the filter assembly takes over only a sound-absorbing and / or the exhaust air stream rectifying function. A particle and / or odor filtration by means of sound-absorbing Layer is not provided. This can already be done by the upstream air filter of the filter assembly.

In such a filter arrangement, the air or particle filter via the air guide or air guide rib is preferably airtight or leak-free coupled with the air-permeable sound absorber for noise reduction. Diffuse exhaust air can thus be guided by the air filter leak-free on the air duct rib and then calm out of the exit areas of the air-permeable sound absorber. By means of a filter arrangement constructed in this way, unpleasant and annoying noises in the blow-out area after an engine-blower unit can additionally be reduced.

Such a filter arrangement can cooperate by their arrangement in the housing particularly synergistically with the filter device presented here for reducing a Ausblasgeräuschs, since both the filter assembly and the downstream in or on the housing air ducts and the relaxation area can each provide a noise reduction.

Embodiments of the present invention also include a household appliance, such as an air conditioner, but especially a vacuum cleaner, with a filter device according to embodiments of the present invention.

Further embodiments and advantageous developments are the subject of the dependent claims, as well as the following detailed description of the accompanying figures.

Hereinafter, embodiments of the present invention will be explained with reference to the accompanying figures. Show it:

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1

a schematic cross section through a filter device for cleaning an exhaust air stream, according to an embodiment of the present invention;

Fig. 2

a perspective view of the filter device according to Fig. 1 ;

Fig. 3

a representation of the filter device according to the Fig. 1 and Fig. 2 in a vacuum cleaner; and

Fig. 4

a vacuum cleaner with a filter device according to an embodiment.

DETAILED DESCRIPTION OF EMBODIMENTS

The Fig. 1 shows a schematic representation of a cross section through a filter device 10 for cleaning or filtering an exhaust air stream, which is indicated by the reference numeral 11, by means of a filter assembly 12th

The filter device 10 comprises a filter housing 13 for receiving, downstream to an exhaust air inlet 14 of the housing 13, the filter assembly 12, wherein the housing 13 downstream of the filter assembly 12 receivable therein has an outlet 15 for the exhaust air flow 11, wherein the outlet 15 via a A plurality of air guide ribs 16 with a downstream of the Abluftstromauslass 15 arranged expansion region 17 is coupled to the exhaust air flow 11. In this case, "downstream" in the flow direction and "upstream" counter to the flow direction of the exhaust air flow 11.

In an area upstream, or in front of the designated as Abluftstromeinlass 14 housing portion may be arranged in embodiments in the housing 13 in addition a motor-fan unit, which for clarity in Fig. 1 however not shown. This motor-blower unit can carry the still unfiltered exhaust air flow 11 through the inlet region 14 to the filter assembly 12, so that the exhaust air flow 11 can be filtered by the air from this.

For this purpose, the filter arrangement 12 may have an air filter 18, which may be, for example, a particle or particulate filter in the form of a HEPA filter. HEPA filters can be used, for example, to filter out viruses, respirable dusts, mite eggs and excrements, pollen, smoke particles, asbestos, bacteria, various toxic dusts, etc., from the exhaust air stream 11. Accordingly, some embodiments of the filter device 10 may be used, inter alia, in the medical field, ie, for example, in operating rooms, intensive care units and / or laboratories, as well as in clean rooms. For the selection of a filter class of the air filter 18 is the respective purpose of use is decisive. Other embodiments of the filter device 10 can also be used for non-industrial applications, such as in household appliances, and in particular in vacuum cleaners. Vacuum cleaners also generally include a motor-blower unit, by means of which a dust-containing exhaust air flow 11 can be filtered via the (downstream) filter arrangement 12 and subsequently blown outwards. In connection with a vacuum cleaner, the air filter 18 may be, for example, a HEPA filter, an electric dust filter and / or a foam filter for odor absorption. Under the air filter 18 can thus - depending on the purpose - also a combination of different air, particle and / or odor filter are understood.

Seen in the direction of the exhaust air stream 11, i. downstream, downstream of the air filter 18, an air-permeable sound absorber 19 can be connected. According to exemplary embodiments, the sound absorber 19 can primarily serve to calm and / or rectify a waste air stream which predominantly diffuses out of the air filter 18, so that a blowout noise of the filter device 10 caused by the exhaust air flow 11 or related thereto can be reduced. According to embodiments, the air-permeable sound absorber 19 may be a sound-absorbing or sound-reducing layer. However, this sound-absorbing or -reducing layer 19 has no air cleaning function, but mainly serves the reassurance and / or the rectification of the exhaust air flow 11 and thus the noise reduction. As sound-absorbing material, according to some embodiments, for example, a sound-absorbing non-woven or a sound-absorbing foam, such as a melamine resin foam may be provided.

A circulating air guide rib 20 arranged in the transitional region between the air filter 18 and the sound absorber 19 is preferably designed to guide the exhaust air flow 11 from the air filter 18 without leakage to the air-permeable sound absorber or to the sound-absorbing layer 19. D. h., The sound-absorbing layer 19 is the air filter 18 by means of the Luftleitrippe 20 quasi airtight or leak-free downstream for noise reduction, which is to be understood that between the side walls 21 of the sound absorber 19 and the rotating air duct 20 no exhaust air is to be able to flow.

For this purpose, the circumferential air guide rib 20 forms in embodiments a contour pocket, the contour of which is formed to accommodate the air-permeable sound absorber 19 without play, so that between the sound absorber 19 and the circulating air duct 20 no exhaust air can flow. The contour or the floor plan of the circumferential air guide rib 20 is thus adapted to a contour or a floor plan of the sound-absorbing layer 19. According to embodiments, the circumferential air guide rib 20, and the sound-absorbing layer 19 may have a substantially rectangular contour, corresponding to a cuboid volume of the sound absorber 19 and / or the air filter 18. Of course, however, with regard to the air filter 18, the circumferential air guide rib 20 and / or the sound-absorbing layer 19, other plans or contours, such as square or circular contours, conceivable.

In order to record the sound absorber 19 without play in the circumferential air guide rib 20, the inner dimensions of the circulating air duct 20, for example, be slightly smaller than the outer dimensions of the sound absorber 19. In this way, the sound absorber 19 after its introduction into the contour of the circulating air duct 20, or the frame formed by this, a kind of clamping fit in the circumferential air duct 20 occupy. In particular, in connection with an elastic, sound-absorbing foam 19 thus a play or freedom from leaks can be achieved. In addition or as an alternative to the clamping fit, the air-permeable sound absorber 19 can also be adhesively bonded to inner surfaces of the circumferential air-guiding rib 20 on its side surfaces in order to prevent the passage of exhaust air 11 between the side walls of the sound absorber 19 and the air-guiding rib 20.

In a preferred embodiment, the circumferential Luftleitrippe 20 has a lower height than the air-permeable sound absorber 19 to be accommodated therein, so that the side surfaces of the air-permeable sound absorber 19 in the assembled state of the filter assembly 12 are only partially covered by the circulating Luftleitrippe 19, as shown in the Fig. 1 can also be seen. That is, the sound-absorbing, exhaust-permeable layer 19 is in the assembled state via a frame formed from the air duct 20 for the sound absorber 19, whereby the side surfaces of the sound absorber 19 in addition to a downstream-facing exhaust air outlet surface of the Sound absorber 19 can be used as a blow-off. This can advantageously contribute to a further reduction of a resistance formed by the sound absorber 19 and thus to a reduction of the air velocity and the blow-out noise.

For example, according to an embodiment of the present invention, the sound-absorbing layer 19 may include (in FIG Fig. 1 seen in the downstream direction) have a height of about 20 mm. This means that according to one embodiment, the height of the circulating air guide rib 19 is smaller than 20 mm. Preferably, the height of the circulating air guide rib 19 is less than half the height of the sound absorber 19 in order to provide sufficient lateral Abluftausblasfläche the sound absorber 19. For example, in one embodiment of the filter assembly 12, the filter assembly 10 may have a length l of about 160 mm, a width b of about 60 mm, and a height h of about 45 mm. At a height of the sound-absorbing foam 19 of about 20 mm, this results in a possible height of the HEPA filter 18 of about 25 mm.

Downstream, i. in the direction of the exhaust air flow 11, the exhaust air flow 11 in the housing 13 can flow from the exhaust air flow exit surfaces of the filter arrangement 12 to the outlet region 15. In this case, after the filter arrangement 12, initially it will primarily be a turbulent flow. In order to guide the exhaust air flow 11 also at edge or corner regions 22 of the housing 13 without serious air turbulences to the downstream outlet 15, the end or corner regions 22 of the housing 13 facing the outlet 15 can be rounded. As a result, the exhaust air flow 11 can be guided uniformly along inner surfaces of the housing 13 and around the corner regions 22 to the outlet region 15.

The initially relatively turbulent exhaust air flow 11 is conducted from the outlet region 15 via the air guide or air guide ribs 16 to the relaxation region 17 connected to the filter housing and, whereby the initially turbulent flow is rectified, ie converted into a predominantly laminar flow. For this purpose, the air guide ribs 16 are arranged or aligned parallel to one another in a transition region from the outlet 15 to the relaxation or expansion region 17. In the case of Fig. 1 illustrated embodiment, the parallel air guide ribs 16 aligned in the transition region in each case in the horizontal direction. But also vertical or oblique orientations are conceivable - depending on the embodiment of the downstream relaxation space or area 17. Although in Fig. 1 By way of example, five parallel air ducting ribs 16 are shown, embodiments may also have more or fewer than five air ducting ribs 16. For example, their number may be in a range between three and ten.

In preferred embodiments of the filter device 10, the filter housing 13, the air guide ribs 16 and the expansion or expansion area 17 are integrally formed, so that a continuous, one-piece discharge area 13, 15, 16, 17 is formed for the exhaust air flow 11. Thus, even with a missing, outer cover of the filter device 10, such as a vacuum cleaner outer housing, a targeted (laminar) exhaust air flow 11 can be achieved with low Luftverwirbelungen. By preferably one-piece housing 13, the filter assembly 12 therein can be protected from damage. To produce the one-piece blow-off region 13, 15, 16, 17 comprising the housing 13, the outlet 15, the air-guiding ribs 16 and the region 17, an injection molding process can be used, for example, to obtain a one-piece plastic part as blow-out region 13, 15, 16, 17 ,

As it especially looks like Fig. 2 showing the filter device 10 in a perspective view, the expansion region 17 may be formed substantially funnel-shaped so as to extend in a downstream direction from the outlet region 15 forming an initial region of the relaxation region 17 to an end region of the Relaxation area 17 out expanded. Coming from the outlet area 15 and the air guide ribs 16 and already rectified exhaust air stream 11 may advantageously relax or calm in the preferably integrally formed on the housing 13 funnel-shaped expansion area 17. One to one in Fig. 2 not shown cyclone outer wall 23 of the relaxation area 17 may at least partially, adapted to a designed as a rotationally symmetrical container cyclone separator, run in a circular arc. As can be seen in particular from the sectional view of Fig. 1 5, downstream end portions of the side walls of the relaxation area 17 may be chamfered and fitted to an outer housing cover, as with reference to FIG Fig. 4 will be clarified.

As it is in Fig. 2 is indicated, on a filter frame of the filter assembly 12 additionally laterally projecting projections 24 may be formed, which serve as gripping portions, by means of which the filter assembly 12 can be easily inserted into the filter housing 13 and removed therefrom.

The Fig. 3 shows the filter device 10 in a built-in household appliance state, wherein the household appliance according to one embodiment may be a vacuum cleaner.

The vacuum cleaner 30 has an engine-fan unit 31 for separating small particles of dust-laden air for the purpose of purifying the air in a cyclone separator (not shown) and depositing them in a collecting tank. Cyclone separators and collecting containers can be accommodated in an area provided with the reference numeral 32. Such, designed as a rotationally symmetrical container cyclone dust-laden, sucked air in an upper part of a fan (motor-fan unit 31) coming at high speed supplied eccentrically, so that heavier dust particles under the action of centrifugal forces outwards to a wall of the Are guided and cleaned of coarse dust air (exhaust air) through a centrally inserted in the upper part of the tank immersion tube (towards the filter assembly 12) can be dissipated. The dust particles are inhibited by friction on the container wall in its circular motion and arrive, slowly falling, in a arranged under the cyclone collecting container, from which they can be removed. The motor / blower unit 31 may also be housed in the housing 13 upstream of the filter assembly 12. From the motor-fan unit 31, the exhaust air is passed through the filter assembly 12 in the housing 13 towards the expansion region 17 of the filter device 10 before passing through an in Fig. 4 shown outlet 41 of a vacuum cleaner outer housing 42 is discharged to the environment. An orientation of the parallel air guide ribs 16 of the filter housing 13 may be advantageous adapted to an alignment of outlet ribs of the outer outlet 41 to flow as quiet as possible. For example, an additional (sound-absorbing) seal in the form of a black fleece may be provided between the downstream end sections of the expansion area 17 and the outlet 41 of the vacuum cleaner outer housing 42.

Embodiments of the present invention thus also include a vacuum cleaner 30 with a filter device 10 according to embodiments.

In embodiments, located on a purge air filter 18, which may include, for example, a HEPA filter, downstream of a circumferential air guide rib 20. This rib 20 may be formed circumferentially on the outflow side of the filter 18. In turn, a sound-absorbing foam as a sound absorber 19 can be clamped airtight in this contour pocket formed thereby. By means of exemplary embodiments of the present invention, diffuse exhaust air can be guided past the air guide rib 20 in a leak-free manner and thus flow out at the outlet regions of the foam-type sound absorber in a calm manner. In particular, by embodiments in which the downstream sound absorber 19 is on the circumferential Luftleitrippe 20 addition, the side surfaces of the foam-like sound absorber 19 can be additionally used as a blow-off, which can contribute to a further reduction of the air velocity and the Ausblasgeräuschs.

According to the filter housing concept described here, the filter arrangement 12 downstream of air ducting ribs 16 for noise reduction, these ribs 16 are firmly or captively connected to the filter housing 13. Even with a missing, outer filter housing cover 41 thus a targeted air flow 11 can be achieved with low Luftverwirbelungen. Furthermore, the filter assembly 12 located in the housing 13 can be protected from damage.

The expansion space 17 between the filter assembly 12 and an outer filter housing cover 41 may advantageously reduce blowout noise. Exiting warm blow-out air 11 can heat adjacent housing components, which can be safely held in position by the air guide ribs 16 and / or the one-piece housing design even with prolonged continuous operation and thus heating-induced deformations can be reduced or avoided. As a result, a dense exhaust air system can be ensured.

LIST OF REFERENCE NUMBERS

10

filter means

11

exhaust air flow

12

A filter assembly

13

casing

14

air inlet

15

exhaust outlet

16

Air guide ribs

17

Relaxation or expansion area

18

air filter

19

sound absorber

20

circumferential air duct

21

Side surface of the sound absorber

22

housing corner

23

curved side wall of the relaxation or expansion area

24

Handle, tab

30

vacuum cleaner

31

Motor-fan unit

32

Space for cyclone separators

41

Staubsaugeraußengehäuseauslass

42

Vacuum cleaner Outside housing

Claims (10)

Filter device (10) for cleaning an exhaust air stream (11) by means of a filter arrangement (12), in particular in a domestic appliance, comprising: a housing (13) for receiving the filter assembly (12) downstream of an inlet (14) of the housing (13), the housing (13) having an outlet (15) for the exhaust air stream (11) downstream of the filter assembly (12) receivable therein ), wherein the outlet (15) via a plurality of air guide ribs (16) with a downstream of the outlet (15) arranged relaxation region (17) for the exhaust air flow (11) is coupled, wherein the air guide ribs (16) in a transition region of the outlet (15) are arranged parallel to each other to the expansion area (17) to rectify the air flowing to the expansion area (17) and the expansion area (17) is positioned in front of an outlet outlet (41) with outlet fins of the vacuum cleaner outer housing (42). The filter device (10) according to claim 1, wherein the relaxation area (17) is formed substantially funnel-shaped so as to expand in a downstream direction from the outlet (15) toward an end area of the expansion area (17). Filter device (10) according to any one of the preceding claims, wherein the housing (13), the outlet (15), the air guide ribs (16) and the relaxation area (17) are integrally formed. Filter device (10) according to one of the preceding claims, wherein the filter arrangement (12) has an air guide rib (20) arranged circumferentially on a downstream side of an air filter (18) and designed to remove the exhaust air flow (11) from the air filter (18). to direct to a stomax in series with the air filter (18) arranged air-permeable sound absorber (19). Filter device (10) according to claim 4, wherein the circumferential air guide rib (20) is designed to guide the exhaust air flow (11) from the air filter (18) leak-free to the air-permeable sound absorber (19). Filter device (10) according to one of claims 4 or 5, wherein the circumferential air guide rib (20) has a lower height than the air-permeable sound absorber (19) to be accommodated therein, so that side surfaces of the air-permeable sound absorber (19) in the assembled state of the filter arrangement (12). only partially covered by the circumferential air guide rib (20). Filter device (10) according to one of claims 4 to 6, wherein the air filter (18) has a particle filter, in particular a HEPA filter, and / or the sound absorber (19) has a sound-absorbing foam. A filter device (10) according to any one of the preceding claims, wherein an orientation of the air guide ribs (16) is adapted to an orientation of the outlet ribs of the outer outlet (41) to quietly flow to the outer outlet (41). A vacuum cleaner (30) having a filter device (10) for cleaning an exhaust air stream (11) according to any one of the preceding claims, wherein the filter device (10) is arranged downstream of a motor-blower unit (31). Method for cleaning an exhaust air stream (11), in particular in a domestic appliance, with the following steps: Providing a housing (13) for receiving a filter arrangement (12), wherein the housing (13) has an inlet (14) and downstream of the inlet (14) an outlet (15) for the exhaust air stream (11), the outlet (15) being traversed by a plurality of air guide fins (16) with a downstream one The relaxation region (17) for the exhaust air flow (11) arranged in the outlet (15) is coupled, and the air guide ribs (16) are arranged parallel to one another in a transition region from the outlet (15) to the expansion region (17) are to rectify the air flowing to the relaxation area (17), and Arranging the filter assembly (12) in the housing (13) between the inlet (14) and the outlet (15) such that the expansion area (17) is located in front of an outlet outlet (41) with outlet fins of the vacuum cleaner outer housing (42).

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