EP2428151B1 - Device for vacuum cleaning with vacuum cleaning device and filter bag - Google Patents

Description

Field of the invention

The invention relates to a device for vacuuming with a vacuum cleaner and a filter bag, in which the filter bag is formed as a flat bag, as a non-woven filter bag and disposable filter bag, and the vacuum cleaner has a filter bag receiving space with rigid walls, wherein the filter bag receiving space closable by a flap opening with a has predetermined opening area through which the filter bag is inserted into the filter bag receiving space. In addition, the invention relates to a filter bag and a method for inserting a filter bag in a filter bag receiving space of a vacuum cleaner.

State of the art

Filter bags in the form of non-woven disposable flat bags are the filter bags most commonly used today. The advantage of non-woven bags (compared to filter bags made of paper) is the significantly higher dust absorption capacity of the filter bag with higher separation efficiency and longer service life. The flat bag form is the most common form for nonwoven bags since bags of this shape are very easy to manufacture. Because in contrast to the paper filter material used in filter bags made of paper, nonwoven filter material is very difficult to permanently fold because of the high resilience, so that the production of more complex bag shapes, such as block bottom bag or other bottom bag forms, is very complicated and expensive.

A flat bag in the sense of the present invention is understood to mean filter bags which are formed from two individual layers of filter material with the same area such that the two individual layers are connected to one another only at their peripheral edges (the term same area does not exclude, of course, that the two individual layers differ from each other in that one of the layers has an entrance opening).

The connection of the individual layers can be realized by a weld or adhesive seam along the entire circumference of the two individual layers; but it can also be formed by a single layer of filter material is folded around one of its symmetry axes and the remaining open peripheral edges of the resulting two partial layers are welded or glued (so-called tubular bag).

A single layer of filter material per se may consist of one or more layers, which may be laminated, for example. Likewise, a single layer of folded filter material may be formed.

Flat bags in the sense of the present invention may also have so-called gussets. These side folds can be completely unfoldable. A flat bag with such gussets is for example in the DE 20 2005 000 917 U1 shown (see there Fig. 1 with folded gussets and Fig. 3 with unfolded gussets). Alternatively, the gussets may be welded to portions of the peripheral edge. Such a flat bag is in the DE 10 2008 006 769 A1 shown (see there in particular Fig. 1 ).

From the above definition of the term flat bag it follows inevitably that flat bags are 2-dimensional structures immediately after production, ie before use have an inner volume which is substantially equal to zero.

However, a filter bag having an internal volume that is substantially zero (before use) is not necessarily a flat bag in the sense of the present invention. For bag shapes that have a bottom, such as in the DE 20 2005 016 309 U1 or the DE 20 2009 004 433 U1 are not flat bags, since they do not consist of two individual layers with the same area, which are interconnected only at their peripheral edges.

In view of the above definitions, it goes without saying that pouches, which are already 3-dimensional structures after production and thus have a non-zero internal volume, as for example in the WO 00/00269 (see Figures 27 and 28 there) and the DE 10 2007 060 748 (see there in particular Fig. 9) are shown, are not flat bags in the sense of the present invention.

A nonwoven filter bag in the sense of the present invention comprises a nonwoven filter material. As a nonwoven material, a dry or wet laid nonwoven or an extrusion nonwoven fabric, in particular a melt-spun microfiber spunbond nonwoven fabric (meltblown nonwoven fabric) or filament spunbond nonwoven fabric (spunbond) may be used. There may also be additional nanofiber layers. The distinction between wet-laid nonwovens, and conventional wet laid paper according to the definition below, as used by the International Association Serving the Nonwovens and Related Industries (EDA-NA). A conventional (filter) paper is therefore not a nonwoven.

The nonwoven fabric may comprise staple fibers or continuous fibers. Manufacturing technology can also provide several layers of staple fibers or continuous fibers, which are solidified to exactly one layer of nonwoven fabric.

The filter material may also be a laminate of a plurality of nonwoven fabric layers, such as filament spunbond fabric and meltblown nonwoven fabric (SMS, SMMS or SnxMS). Such a laminate may be laminated or calendered by means of a hot melt adhesive. The layer of meltblown nonwoven fabric may be creped.

The term nonwoven fabric is used in accordance with the definition according to ISO standard ISO 9092: 1988 or standard EN 29092. In particular, the terms nonwoven fabric or nonwoven fabric and nonwoven fabric in the field of production of nonwoven fabrics are delimited from one another as follows and also to be understood in the sense of the present invention. To produce a nonwoven fabric fibers and / or filaments are used. The loose or loose and still unconnected fibers and / or filaments are referred to as nonwoven or nonwoven web. By a so-called non-woven binding step, such a non-woven fabric is finally used to form a non-woven fabric which has sufficient strength to be wound into rolls, for example. In other words, a nonwoven fabric is self-supportingly formed by the solidification. (Details on the use of the definitions and / or methods described herein can also Standard work "Nonwovens", W. Albrecht, H. Fuchs, W. Kittelmann, Wiley-VCH, 2000 remove.)

The nonwoven material may be present for a filter bag in the sense of the present invention as an unfolded layer or in turn have surface wrinkles. How such surface wrinkles can be formed, for example, results from the European patent application 10163463.2 ,

The size of known from the prior art flat bags made of nonwoven depend on the application. A commonly used size of such filter bags for household vacuum cleaners have a length and a width of about 30 cm each and a height of about 1 cm.

A conventional vacuum cleaner, in particular, a conventional vacuum cleaner apparatus in which filter bags of the above size are used, has a filter bag accommodating space whose length, width and height are each in the range between 10 cm and 20 cm. In the DE 10 2008 045683 A1 US-A-5 585 7, which discloses the preamble of apparatus claim 1, describes a dust filter bag device for a vacuum cleaner which has means for counteracting or limiting expansion of the filter bag in the operating state.

The filter bag accommodating space according to the present invention is formed of rigid walls. For this purpose, the filter bag receiving space can be provided as an integral part of the housing or as a partial housing of the vacuum cleaner. No rigid walls within the meaning of the invention have filter bag containment spaces made of a solid fabric known in the art of handheld vacuum cleaners (see, for example, US Pat EP 0 161 790 ).

If one now inserts a conventional filter bag in a conventional vacuum cleaner, the above-mentioned proportions of filter bag and filter bag receiving space of the vacuum cleaner to the filter bag in the filter bag receiving space can not be fully deployed, but (in addition to the two superimposed individual layers) rather cover different areas of the superimposed individual layers or cover themselves areas of one or both of the individual layers themselves. The proportions also lead to the fact that the filter bag can not fully unfold even during operation of the vacuum cleaner. This effect is additionally characterized reinforces that the filter bags are inserted in the folded state in the filter bag receiving space. (For example, if you pack five of the above-mentioned filter bags without folding them, you would now receive a package that is about 30cm x 30cm x 5cm in size.Such a packaging size is totally unsuitable for the sale of filter bags, filter bags are always folded before being placed in a suitable packaging for sale, the filter bags are then simply removed from the package and inserted in the vacuum cleaner device when folded into the filter bag containment space.) This overlap of filter surface in conventional filter bags in conventional vacuum cleaner leads during suction to uneven utilization and filling of the filter bag. The properties inherent in the filter bag, such as dust absorption capacity, separation efficiency and service life, are thus not optimally utilized.

In view of these disadvantages of the prior art, the present invention has the object to provide a combination between vacuum cleaner and filter bag, which better exploit the properties inherent in the filter bag, such as dust holding capacity, separation efficiency and service life.

The object underlying the invention is achieved by a device according to claim 1 and by a method according to claim 8.

The receiving volume of the filter bag in the filter bag receiving space is determined according to the present invention according to EN 60312, Chapter 2.7.

The maximum receiving volume of the filter bag is determined according to the present invention analogous to EN 60312, Chapter 2.7. The only difference to EN 60312, Chapter 2.7, is that the filter bag is designed to be suspended in a chamber the volume of which is at least sufficient to prevent the filter bag from fully expanding to its maximum possible size when fully filled. For example, a cube-shaped chamber having an edge length equal to the root of the sum of the squares of maximum length and maximum width of the filter bag satisfies this requirement.

If the filter bag receiving space is designed such that the filter bag provided for it fulfills the above-mentioned conditions, then it is ensured that the entire filter surface of the filter bag is available during the entire suction operation (until the bag is changed) and thus the filter bag becomes the operation is optimally filled. The filter properties of the filter bag, in particular the dust absorption capacity achievable for the filter bag with high separation efficiency and long service life, are thus optimally utilized until the filter bag is changed.

According to a preferred development, moreover, the ratio of the surface of the filter bag receiving space and the surface of the filter bag may be greater than 0.90, preferably greater than 0.95, most preferably greater than 1.0.

The surface of the filter bag in the sense of the present invention is defined here as twice the area occupied by the filter bag when it lies flat in a completely unfolded form, ie in a 2-dimensional form. The area of the entrance opening and the area of the welds are not taken into account as they are comparatively small in relation to the actual filter area. Likewise, any foldings provided in the filter material itself (to increase the surface area of the filter material) are disregarded. The surface of a rectangular filter bag (as defined above) thus results simply from being taken out of its package, fully unfolded, measured its length and width, multiplied together and the result taken two times.

The surface of the filter bag accommodation space in the sense of the present invention is defined as the surface that the filter bag accommodation space would have (if any) all the facilities (ribs, rib sections, stirrups, etc.) provided in the filter bag accommodation space for the filter material of the filter bag Filter bag from the wall of the filter bag receiving space remains isolated (which is required for a smooth filter material to ensure that even air can flow through the filter bag) remain disregarded. The surface of a cuboid filter bag receiving space with ribs thus results as maximum length times maximum width times maximum height of the filter bag receiving space without taking into account the dimensions of the ribs.

Since the surface of the filter bag accommodating space enters the above relation only as a lower limit, in order to determine whether a particular vacuum cleaner in combination with the filter bag makes use of the previously discussed embodiment, especially if the filter bag containing space is of complicated geometrical shape, alternatively the surface of a parallelepiped Body can be determined, which completely encloses the filter bag receiving space; the surface of such a body is obtained, for example, if one determines the surface of a cuboid with the edge lengths which correspond to the maximum extent of the actual filter bag receiving space in the length, width and height direction (length, width and height directions are of course orthogonal to one another) ,

Are filter bag receiving space and provided for him filter bag designed so that the above condition is met, then both are particularly advantageous matched, so that the filter properties of the filter bag, especially the achievable for the filter bag dust holding capacity with high separation efficiency and long life, optimally utilized become.

According to a preferred embodiment of the present invention, the filter bag receiving space may be formed essentially of two curved surfaces. Alternatively, the filter bag accommodation space may also be formed of two curved surfaces and one side surface, the side surface connecting the two curved surfaces along the circumference of the curved surfaces. This development takes account of the fact that filter bags in the form of flat bags, which have a substantially rectangular shape, with free filling (ie in a filling in which the filter bag is not limited by a filter bag receiving space in its extension) so that they adopt a pillow shape. The two alternatives described represent an optimal adaptation of the filter bag receiving space to the filter bag. On the one hand, conditions are always present until the filter bag is completely filled, so that the dust absorption capacity achievable for the filter bag is not adversely affected at high separation efficiency and long service life. On the other hand, the requirement can be met that the dust filter receiving space can be made as small as possible in order to keep the overall dimensions of the vacuum cleaner as small as possible.

According to a preferred embodiment of the present invention, including all the developments described above, the vacuum cleaner can be a vacuum cleaner. Vacuum cleaners in the sense of the present invention are vacuum cleaner devices in which filter bag receiving space and vacuum cleaner motor in a housing (which may also consist of two interconnected sub-housings) are provided, to this housing a hose and / or a pipe (to which or a dust receiving device, such as a floor nozzle, a suction brush, a furniture brush or the like) are connected and in which this housing is provided on rollers, so that in the suction only primarily the hose and / or pipe and the corresponding dust receiving device must be moved and secondarily it will be much heavier. Since such weight of the components to be moved is minimized in such a vacuum cleaner, such vacuum cleaner devices to operate with the least amount of force and therefore in the household sector the most common devices in which the present invention can be advantageously used. The invention can also be used advantageously in a hand vacuum cleaner.

According to another advantageous development, the surface of the filter bag accommodation space may comprise ribs and / or rib-shaped sections and / or stirrups, the filter bags consist of a filter material with a fold-shaped surface, and the height of the ribs and / or the rib-shaped sections and / or the stirrups is greater than that maximum fold height of the fold-shaped surface. Through this development, the filter bag receiving space is so on filter bag with surface wrinkles, such as from the European patent application 10163463.2 are known adapted, that the surface wrinkles can fully unfold and thus the maximum available filter area is impinged in the suction operation.

According to an alternative development described in the last paragraph, the surface of the filter bag receiving space may be formed substantially smooth and the surface of the filter bag be profiled such that when placed in the vacuum cleaner filter bag most of the surface of the filter bag remains at a distance from the surface of the filter bag receiving space. Through this development, the filter bag receiving space can be produced in the simplest way. Committee in the manufacture of vacuum cleaner devices, which is formed by the fact that ribs, rib-shaped sections and straps are formed incorrectly, is thus avoided.

Advantageously, can be used in the development described in the last paragraph filter bag in which the profiling has wrinkles. In operation, only the tips of the pleats touch the walls of the filter bag containment space.

According to another embodiment of the present invention may be provided at least a portion of the wall of the filter bag receiving space a hole wall at a predetermined distance from the wall. With such a perforated wall, the same effect as with ribs, rib-shaped sections and ironing can be achieved. To provide such a perforated wall simplifies compared to ribs, rib-shaped sections and bracket the design effort.

If the filter bag accommodation space is formed by two curved surfaces (with or without side wall), then advantageously at least one of the curved surfaces, preferably the curved surface forming the bottom of the filter bag accommodation space, may have a hole wall at a predetermined distance.

According to the present invention there is also provided a filter bag which can be used in a preferred manner in connection with the present invention.

• vorzugsweise D_EÖ < 1/2 D_FB und
• höchst vorzugsweise D_EÖ < 1/4 D_FB.

This filter bag is a substantially rectangular flat bag formed of nonwoven fabric and has an inlet opening such that the center of gravity of the area of the inlet opening has a shortest distance D _E to one of the four corners of the filter bag and the center of gravity of the surface of the filter bag has a shortest distance D _FB to the same corner of the filter bag and D _EÖ and D _{FB have the} following relation: $${\mathrm{D}}_{\mathrm{e}\ddot{\mathrm{O}}}<\mathrm{2}/\mathrm{3}{\mathrm{DS}}_{\mathrm{FB}}.$$

• preferably D _EÖ <1/2 D _FB and
• most preferably D _EÖ <1/4 D _FB .

To determine the center of gravity of the surface of the filter bag is analogous to the determination of the surface, starting from the area that occupies the filter bag when it is flat on a base, so there is a 2-dimensional structure. If the filter bag has unwelded gussets, these are unfolded to determine the center of gravity. Welded gussets remain disregarded analogous to determining the area of the filter bag.

In such a filter bag, the inlet opening is provided in one of the four corners of the filter bag (as opposed to the prior art rectangular flat bags in which the inlet opening is typically provided exactly in or near the center axis of the filter bag).

This results in particularly favorable flow conditions in the filter bag, as otherwise only by additional so-called deflection, as for example from the EP 1 787 560 A1 or EP 1 787 563 A1 are known, can be achieved. These favorable flow conditions allow a uniform filling of the filter bag. A provision of an additional deflection device as in the aforementioned prior art is thus unnecessary, whereby the production of the filter bag is simplified.

Incidentally, such filter bags can also be used in vacuum cleaner devices in which the filter bag receiving space is not adapted according to the invention to the bag. Even in such a case, the flow conditions can be improved over a rectangular filter bag in the form of a flat bag, without additional measures, such as deflection devices are required.

According to a preferred embodiment of the filter bag described above, this has a holding plate on which an open at existing suction flow and closed at not existing suction flow closure for the filter bag is arranged in the form of a flap. Appropriately, in this case, the closure is fastened with a hinge to the holding plate and the hinge is provided in the direction of the corner of the filter bag. Apart from the known from the prior art advantages of a self-opening and self-closing flap closure, which is secured to a support plate by means of a hinge (namely that the filter bag remains closed in idle mode and such a design in a particularly simple manner, for example by injection molding can), according to the invention, ie by the fact that the hinge points towards the corner of the filter bag, an optimal distribution of the air flow in the filter bag is achieved.

In addition, the invention provides a method of loading a filter bag into a filter bag containment space.

Brief description of the figures

Fig. 1:

eine Schrägansicht einer ersten Ausführungsform der Vorrichtung zum Staubsaugen gemäß der vorliegenden Erfindung, in welcher der Filterbeutelaufnahmeraum geschlossen ist;

Fig. 2:

eine Schrägansicht der in Fig. 1 gezeigten Ausführungsform, in welcher der Filterbeutelaufnahmeraum geöffnet ist, so dass man den eingelegten Filterbeutel sieht;

Fig. 3:

eine Querschnittsansicht des Filterbeutelaufnahmeraums einer zweiten Ausführungsform der Vorrichtung zum Staubsaugen gemäß der vorliegenden Erfindung;

Fig. 4:

eine Querschnittsansicht des Filterbeutelaufnahmeraums einer dritten Ausführungsform der Vorrichtung zum Staubsaugen gemäß der vorliegenden Erfindung;

Fig. 5:

eine Querschnittsansicht eines Ausschnitts einer Wand des Filterbeutelaufnahmeraums mit eingelegtem Filterbeutel gemäß einer vierten Ausführungsform der Vorrichtung zum Staubsaugen gemäß der vorliegenden Erfindung; und

Fig. 6:

eine Querschnittsansicht eines Ausschnitts einer Wand des Filterbeutelaufnahmeraums mit eingelegtem Filterbeutel gemäß einer fünften Ausführungsform der Vorrichtung zum Staubsaugen gemäß der vorliegenden Erfindung.

In the figures show:

Fig. 1:

an oblique view of a first embodiment of the device for vacuuming according to the present invention, in which the filter bag receiving space is closed;

Fig. 2:

an oblique view of in Fig. 1 shown embodiment in which the filter bag receiving space is opened, so as to see the inserted filter bag;

3:

a cross-sectional view of the filter bag receiving space of a second embodiment of the device for vacuuming according to the present invention;

4:

a cross-sectional view of the filter bag receiving space of a third embodiment of the device for vacuuming according to the present invention;

Fig. 5:

a cross-sectional view of a section of a wall of the filter bag containing space with inserted filter bag according to a fourth embodiment of the device for vacuuming according to the present invention; and

Fig. 6:

a cross-sectional view of a section of a wall of the filter bag receiving space with inserted filter bag according to a fifth embodiment of the device for vacuuming according to the present invention.

Description of the preferred embodiments of the invention

The Figs. 1 and 2 show a first embodiment of a device for vacuuming according to the present invention, wherein in Fig. 1 the filter bag receiving space is closed and in Fig. 2 the filter bag receiving space is opened. In Fig. 2 the filter bag is visible.

At the in Fig. 1 shown vacuum cleaner is a vacuum cleaner, which has a housing which consists of a first part 210 and an associated second part 220 consists. The first part 210 in this case represents the filter bag receiving space. In the second part 220 is the engine of the vacuum cleaner. To the first part 210, a tube 211 is connected. As in Fig. 1 , and especially in Fig. 2 As seen, the filter bag containment space is formed of a first curved surface 212a and a second curved surface 212b.

In Fig. 2 In addition, a filter bag 230 can be seen. This filter bag has the inlet port 231 provided in one of its corners. The distance D _{E o of} the center of gravity of the inlet opening from the corner in the illustrated embodiment is about ¼ of the distance D _{FB of} the center of gravity of the filter bag from the corner. As a result, a particularly good flow distribution is achieved.

Further, in front of the inlet opening 231, a flap 233 is provided which opens itself by the suction flow and which self-closes when the suction flow is interrupted. This is provided on a holding plate 232, by means of which the filter bag is fixed in the filter bag receiving space.

In the in Fig. 2 is a filter bag with dovetail-shaped surface wrinkles inserted into the filter bag receiving space.

In the following table, the ratio of the area of the opening area corresponding rectangle F _RE to the filter surface F _filter , the ratio of the receiving volume of the filter bag in the receiving space V _AR to its maximum pickup volume V _Max and the ratio of the surface of the filter bag receiving space S _AR to the surface of the Filter bag S _filter for in the Figs. 1 and 2 shown embodiment according to the invention and for a representative of the prior art device for vacuuming indicated. The state-of-the-art device is the UltraOne ECO vacuum cleaner from AEG / Elektrolux with its S-Bag Ultra Long Perfomance vacuum cleaner bag. F _RE / F _filter V _AR / V _Max S _AR / S _filter State of the art 0.46 0.59 0.69 invention 1.10 0.81 1.05

Fig. 3 shows a cross section through the filter bag receiving space of a second embodiment of the present invention. The cross section here passes through the center of the filter bag receiving space along a first direction. Along a second direction orthogonal to the first direction, the cross section is similar to that in FIG Fig. 3 , shown. According to this embodiment, the filter bag accommodation space consists of two curved surfaces 400a and 400b.

Fig. 4 shows a cross section through the filter bag receiving space of a third embodiment of the present invention. According to this embodiment, besides two curved surfaces 500a and 500b, the filter bag accommodation space has a side surface 500c which connects the two curved surfaces at their periphery.

The in the Figs. 3 and 4 On the one hand, there are always conditions until the filter bag is completely filled, so that the dust absorption capacity achievable for the filter bag does not have a negative effect at high separation efficiency and a long service life to be influenced. On the other hand, the requirement can be met that the dust filter receiving space can be made as small as possible in order to keep the overall dimensions of the vacuum cleaner as small as possible.

In Fig. 5 FIG. 12 is a cross-sectional view of a portion of a wall of the filter bag containing space 610 with the filter bag 620 loaded according to a fourth embodiment of the vacuuming apparatus according to the present invention. The wall 610 has ribs 611 in this embodiment. The filter bag 620 has so-called dovetail folds 621. The maximum fold height of the dovetail folds 621 (ie, the height when fully folded) is less than the height of the ribs 611. This can greatly increase the effective filter area. This allows a highly efficient combination of vacuum cleaner and filter bag to be realized.

In Fig. 6 FIG. 12 is a cross-sectional view of a portion of a wall of the filter bag containing space 710 with the filter bag 720 loaded according to a fifth embodiment of the vacuuming apparatus according to the present invention. The surface of the wall of the filter bag accommodating space 710 is smooth. The surface of the filter bag 720 is profiled by standing folds, so most of the Surface of the filter bag remains at a distance to the surface of the filter bag receiving space. Also in this embodiment, the effective surface area of the filter material can be increased, which is also a highly efficient combination of vacuum cleaner and filter bag.

Claims (8)

1. A vacuum-cleaning apparatus with a vacuum-cleaner unit and a filter bag (230, 620, 720), in which
   the filter bag (230, 620, 720) is configured as a flat bag, as a nonwoven filter bag (230, 620, 720) and as a disposable filter bag (230, 620, 720),
   the vacuum-cleaner unit comprises a filter-bag accommodating chamber (210, 610, 710) with rigid walls, the filter-bag accommodating chamber (210, 610, 710) comprising an opening which can be closed by a flap and has a predetermined opening area, through which the filter bag (230, 620, 720) can be inserted into the filter-bag accommodating chamber (210, 610, 710),
   the ratio of the holding volume of the filter bag (230, 620, 720) in the filter-bag accommodating chamber to the maximum holding volume of the filter bag (230, 620, 720) is greater than 0.70, preferably greater than 0.75, highly preferably greater than 0.8;
   characterized in that
   the surface of the filter-bag accommodating chamber (210, 610, 710) comprises ribs (611) and/or rib-shaped sections and/or bows and the filter bag (230, 620, 720) consists of a filter material with fold-like surface, wherein the height of the ribs (611) and/or of the rib-shaped sections and/or the bows is greater than the maximum folding height of the fold-like surface.
2. The apparatus according to patent claim 1 or 2, in which the ratio between surface of the filter-bag accommodating chamber (210, 610, 710) and the surface of the filter bag (230, 620, 720) is greater than 0.90, preferably greater than 0.95, highly preferaly greater than 1.0.
3. The apparatus according to any one of the preceding patent claims, in which the filter-bag accommodating chamber (210, 610, 710) is substantially formed of two curved areas (400a, 400b, 500a, 500b).
4. The apparatus according to any one of the preceding patent claims, in which the filter-bag accommodating chamber (210, 610, 710) is formed of two curved areas (400a, 400b, 500a, 500b) and a side area, wherein the side area connects the two curved areas along the periphery of the curved areas (400a, 400b, 500a, 500b).
5. The apparatus according to any one of the preceding patent claims, in which the vacuum-cleaner unit is a floor vacuum cleaner or a hand-held vacuum cleaner.
6. The apparatus according to any one of the preceding patent claims, in which in front of at least a part of the wall of the filter-bag accommodating chamber (210, 610, 710) a perforated wall is provided at a predetermined distance from the wall.
7. The apparatus according to patent claim 6in combination with one of patent claims 3 or 4, in which in front of at least one of the curved areas (400a, 400b, 500a, 500b) a perforated wall is provided at a predetermined distance.
8. A method for inserting a filter bag (230, 620, 720), which is configured as a flat bag, as a nonwoven filter bag (230, 620, 720) and as a disposable filter bag (230, 620, 720), into the filter-bag accommodating chamber (210, 610, 710) of a vacuum-cleaner unit, the filter-bag accommodating chamber (210, 610, 710) having rigid walls, and the filter-bag accommodating chamber (210, 610, 710) comprising an opening which can be closed by a flap and has a predetermined opening area, through which the filter bag (230, 620, 720) can be inserted into the filter-bag accommodating chamber (210, 610, 710),
   characterized in
   that the filter bag (230, 620, 720) is inserted in a completely unfolded form as a two-dimensional structure into the filter-bag accommodating chamber (210, 610, 710).

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