DE102019201845A1 - Household appliance for treating laundry - Google Patents

Abstract

The invention relates to a household appliance (1) for treating laundry, having a base (12b) and a top (12a), the top (12a) being arranged opposite the base (12b). The household appliance (1) also has a pumping unit (53) for pumping over and / or pumping out the fluid (35) present during a cleaning and / or drying process, a drive unit (55) for essentially driving the pumping unit (53), a Control unit (57) for controlling the drive unit (55) and a filter unit (15) for filtering the fluid (35), the filter unit (15) comprising a plurality of filter assemblies (13), the plurality of filter assemblies (13) being arranged in series and the plurality of filter assemblies (13) are each fluidically connected via at least one overflow (27).

Description

The invention relates to a household appliance for treating laundry.

In household appliances for treating laundry, filter units are used which are used to filter fluids. This fluid can be a water-soap mixture, as is used, for example, in washing machines and dishwashers and / or washer-dryers, or consist of steam or process air, as is used, for example, in dryers and / or washer-dryers. When these household appliances are in operation for handling laundry, dirt particles get into the respective fluid during a cleaning or drying process, also called a cleaning or drying process. The dirt particles can i.a. Food residues, hair, fats, sand, fibers from laundry items, microplastic particles and / or dust or dirt particles.

These dirt particles are filtered out of the respective process by a filter unit during and / or after the cleaning or drying process. During the cleaning or drying process, one and / or more pumping processes can be carried out in which the fluid is pumped around, cleaned of dirt particles and reintroduced into the cleaning or drying process. After a cleaning or drying process, the so-called residual fluid remains, which is rich in dirt particles. As a rule, this residual fluid is no longer required and is pumped out of the household appliance and fed into a sink or a drain line. Before being fed into the sink, the fluid is once again passed through the filter unit, as a result of which fewer or almost no dirt particles get into the waste water or into the waste water system.

In the US 7,467,636 B2 a household appliance, in particular a dishwasher, is shown, which essentially comprises a spray system and a filter assembly. The filter assembly is arranged in a lower area of the washing compartment of the dishwasher. The filter assembly is designed in the form of a plate and has a first filter area which is arranged in an outer ring of the plate-shaped filter assembly, and a second filter area which is arranged in an inner ring of the plate-shaped filter assembly.

Another filter unit of a dishwasher is in the U.S. 5,779,812 A described. The filter unit also has a plate-shaped configuration and comprises a first and a second filter device. The first filter device has separate segments with a fine-mesh filter membrane. The second filter device, on the other hand, consists of a coarse-meshed filter membrane. With these different membranes, different particles can be filtered out of the fluid.

As can be seen from the two publications cited above, various filter systems for water-carrying or fluid-carrying household appliances are known from the prior art, which filter dirt particles and fibers from a fluid. Particularly during the cleaning and / or drying process of laundry, strong and rapidly forming clumps occur. The clumps are formed, among other things, from dirt particles that detach from the laundry to be treated. As a result of the clumping, a filter membrane is almost and / or completely clogged within a very short time, usually within a cleaning and / or drying process for laundry. This leads to impenetrable filter units and can even flood the washing machine, so that fluid, e.g. B. detergent solution leaks from the machine.

It is therefore the object of the invention to design a household appliance for treating laundry with a filter unit, in which filtering is ensured during several cleaning and / or drying processes of laundry with the filter unit and a filter result in which the fluid is almost guaranteed Is free of dirt particles.

This object is achieved by the features of claim 1. Advantageous embodiments are the subject of the dependent patent claims, the description and the drawings.

According to one aspect, the object of the invention is achieved by a household appliance for treating laundry. The household appliance comprises a device base and a device top, the device top being arranged opposite the device base. Furthermore, the household appliance has a pumping unit for pumping over and / or pumping out the fluid present during a cleaning and / or drying process. The pump unit is essentially driven by a drive unit. Furthermore, the household appliance according to the invention has a control unit for controlling the drive unit and a filter unit for filtering the fluid, the filter unit comprising a plurality of filter assemblies. The multiple filter assemblies are arranged in series and are each fluidically connected to one another via at least one overflow.

The overflow prevents clogging of the filter unit or the filter assemblies, so that the fluid in a filter assembly is also clogged another filter assembly of the filter unit can be filtered. This also ensures a longer use or throughput time of the filter unit without having to clean or replace the filter. An uncontrolled leakage of the fluid from the cleaning and / or drying process when the filter unit is clogged is also avoided.

The filter unit advantageously has a filter inlet and a filter outlet, the fluid flowing through the filter inlet into the filter unit and the fluid flowing along a filter path to the filter outlet and flowing out of the filter unit through the filter outlet, the fluid flowing along essentially due to gravity the filter web flows.

A cost-effective production of the filter unit is ensured because a further drive unit and / or pump unit is not required for the filter unit in order to allow the fluid to flow along the filter path.

The more filter assemblies the filter unit comprises, the longer filtering or the use of the filter unit can be guaranteed. However, in order to be able to arrange the multiple filter assemblies, the filter unit must have a certain height. The structure of the filter unit can vary depending on the space available. The filter unit preferably extends from the top of the device almost to the bottom of the device.

The plurality of filter assemblies each advantageously have an upper filter area and a lower filter area, the upper filter area being arranged in the area of the top of the device and the lower filter area being arranged in the area of the bottom of the device. Furthermore, an overflow edge of the overflow is formed in the upper filter area and / or lower filter area.

This ensures that if a filter assembly is clogged by deposits of fluid particles, the fluid can flow on to one and / or more further filter assemblies and / or to the filter outlet.

In an advantageous embodiment, the fluid acts on the filter assembly arranged closest to the filter inlet, the multiple filter assemblies being arranged in such a way that the fluid flows over at least one overflow edge of an overflow into the closest filter assembly when the filter assembly to which the fluid is applied is caused by deposits of fluid particles in the Is essentially undruchströmbar.

If a filter assembly is clogged, the filtering process can be continued, since the fluid can flow over the overflow edge to the closest filter assembly.

It is particularly advantageous if the plurality of filter assemblies are essentially arcuate.

In the case of an essentially arch-shaped filter assembly, the deposits or dirt particles in the fluid can slide into the lower filter area due to gravity, while filtering is maintained in the upper filter area.

The plurality of filter assemblies are advantageously arranged in a cascade. The cascade-like or step-like arrangement ensures that the fluid flows to a further filter assembly due to the force of gravity.

If all of the filter assemblies are essentially impervious to flow, the fluid flows into the filter outlet along a meandering filter path.

Due to the force of gravity, if one or more filter assemblies are clogged, the fluid flows in a meandering fashion to the filter outlet, which ensures that the fluid flowing into the filter unit can flow out of the filter unit again and thus no or almost no fluid in the filter unit after the end of the Cleaning or drying process remains. A meandering filter web is understood to mean that the fluid looks for a way in which it can flow through the filter unit. However, this depends on the accumulation of dirt particles. The meandering filter path essentially extends from the filter inlet to the filter outlet.

According to a second aspect of the invention, the object is achieved by a method for filtering fluids in a household appliance for treating laundry. The household appliance for treating laundry comprises an appliance base and an appliance top, the appliance top being arranged opposite the appliance base. Furthermore, the household appliance for treating laundry comprises a pump unit for pumping over and / or pumping out the fluid present during a cleaning and / or drying process, a drive unit for essentially driving the pump unit. The drive unit is controlled by a control unit. Furthermore, the household appliance for treating laundry has a filter unit for filtering the fluid, the filter unit comprising several filter assemblies. The multiple filter assemblies are arranged in series and fluidically connected to one another via at least one overflow.

This has the technical advantage that if a filter assembly is clogged, the fluid can flow via the overflow into a further filter assembly, so that the filtering process, the cleaning and / or drying process, can be continued.

The fluid is preferably pumped via the pump unit to a filter inlet, through which the fluid flows into the filter unit, so that the fluid flows through the filter unit due to gravity along a filter path and acts on at least one of the plurality of filter assemblies, and is filtered through a filter outlet flows out of the filter unit, the filter web extending from the filter inlet to the filter outlet.

A cost-effective production of the filter unit is guaranteed because no further pump and drive units are required for the filter unit, since the fluid is driven by gravity and thus flows through the filter unit.

Advantageously, the fluid flows through the filter inlet to a filter assembly arranged closest to the filter inlet and the acted upon filter assembly is flowed through until the filter assembly becomes essentially impermeable.

As a result, essentially not all filter assemblies of the multiple filter assemblies are wetted by deposits of fluid particles in one cleaning and / or drying process, so that the filter assemblies wetted with deposits can be cleaned easily and quickly without always cleaning all filter assemblies of the filter unit with each cleaning have to.

Preferably, when a filter assembly becomes essentially non-flowable, the fluid flows over an overflow edge of the overflow to a filter assembly closest to the essentially impenetrable filter assembly.

The filtering process can also be continued when a filter assembly or a plurality of the filter assemblies of the plurality of filter assemblies have become almost impervious to flow.

• 1 zeigt eine schematische Frontansicht eines Haushaltsgeräts zum Behandeln von Wäsche, hier beispielsweise eine Waschmaschine;
• 2 zeigt eine schematische Seitenansicht einer Filterbaugruppe;
• 3 zeigt eine kaskadenförmige Anordnung mehrerer Filterbaugruppen einer Filtereinheit;
• 4 zeigt schematisch eine Filtereinheit mit im Wesentlichen baugleichen Filterbaugruppen;
• 5 zeigt eine weitere Ausgestaltung und Anordnung der mehreren Filterbaugruppen in der Filtereinheit;
• 6 zeigt schematisch, in stark vereinfachter Form, ein Zirkulationsprinzip eines Haushaltsgeräts zum Behandeln von Wäsche.

Further properties and advantages of the present invention emerge from the following description with reference to the drawings.

• 1 shows a schematic front view of a household appliance for treating laundry, here for example a washing machine;
• 2 Figure 3 shows a schematic side view of a filter assembly;
• 3 shows a cascade arrangement of several filter assemblies of a filter unit;
• 4th shows schematically a filter unit with substantially identical filter assemblies;
• 5 shows a further configuration and arrangement of the plurality of filter assemblies in the filter unit;
• 6 shows schematically, in a greatly simplified form, a circulation principle of a household appliance for treating laundry.

In 1 Figure 3 is a schematic front view of a household appliance 1 for treating laundry, in particular a washing machine, shown. It can also be used under a household appliance 1 a dryer, washer-dryer or dishwasher can also be read. For the sake of simplicity, only the washing machine is referred to below as a household appliance 1 described in more detail.

The household appliance 1 for treating laundry in 1 has a washing machine front wall 3 on. On the washing machine front wall 3 is, among other things, a movable dispensing bowl 5 , into which a washing care substance, such as a detergent and / or a fabric softener, can be filled, and a washing machine display unit 7th , with which, among other things, a washing program can be set. There is also a hinged washing machine door 9 and a cleaning hatch (not shown), which by means of a cleaning hatch cover 11 is covered, on the washing machine front wall 3 of the household appliance 1 arranged for treating laundry. Furthermore, the household appliance 1 a device top 12a and one of the top of the device 12a device base arranged opposite 12b on.

A schematic side view of a filter assembly 13th that are in a filter unit 15th is arranged is in 2 shown. The filter assembly 13th essentially comprises a filter frame 17th . In the filter frame 17th is a filter membrane 19th arranged. The filter membrane 19th is with the filter frame 17th firmly connected. For example, the filter membrane 19th Via an adhesive and / or screw and / or clamp connection to the filter frame 17th be connected. However, other fastening or connecting measures are also known to the person skilled in the art. The filter frame 17th the filter assembly 13th essentially has an arcuate shape, so that the filter membrane 19th bent in the filter frame 17th is recorded. The arched one The design of the filter assembly can be banana-shaped.

The filter membrane 19th has an upper filter area 21st and a lower filter area 23 on. Depending on how the filter membrane is 19th out 2 into the filter unit 15th is integrated, the in 2 shown upper and lower filter area 21st , 23 turn around. Ideally, the upper filter area is 21st in the area of the top of the device 12a arranged and the under filter area 23 in the area of the device base 12b . The filter membrane 19th can have any membrane pattern.

Furthermore, the filter assembly 13th an overflow edge 25 on. The overflow edge 25 can either in the upper filter area 21st or in the lower filter area 23 of the filter frame 17th be arranged. The overflow edge 25 is on the side of the filter frame 17th arranged on the top of the device 12a is facing. In the area of the overflow edge 25 is an overflow 27 educated. The overflow preferably extends between the overflow edge 25 and the top of the device 12a of the household appliance 1 . On the overflow 27 and the overflow edge 25 will be discussed further below.

In 3 Figure 13 is a schematic view of a cascading arrangement of the plurality of filter assemblies 13th the filter unit 15th shown. The filter unit 15th essentially comprises a filter housing 29 on. The filter housing 29 essentially comprises a filter inlet 31 and a filter output 33 . The filter inlet 31 is preferably near the top of the device 12a educated. In the area of the device base 12b is preferably the filter outlet 33 educated. This arrangement ensures that fluid 35 due to gravity from the filter inlet 31 to the filter outlet 33 can flow.

Arrow A shows the direction of flow of the fluid 35 through the filter inlet 31 into the filter unit 15th shown inside. Arrow B indicates the direction of flow of the fluid 35 through the filter outlet 33 from the filter unit 15th shown out. To put it simply, flows through the filter inlet 31 Fluid 35 into the filter unit 15th , is in the filter unit 15th filtered and filtered through the filter outlet 33 from the filter unit 15th out again. In the filter unit 15th the fluid flows 35 due to gravity along a filter path 37 . The filter web 37 depending on how dirty the filter unit is 15th run differently, but always extends from the filter inlet 31 up to the filter outlet 33 .

But it is also conceivable that the filter input 31 and the filter output 33 also at another point on the filter unit 15th are trained. For example, the filter input 31 and the filter output 33 also on a side wall 40 of the household appliance. It only needs to be ensured that the fluid 35 due to gravity in the filter unit 15th can flow.

The filter unit also includes 15th in 3 several filter assemblies 13th . The filter assemblies 13th are arranged in series. Furthermore, the plurality of filter assemblies are arranged in a cascade or stepped manner. The filter assemblies 13th are fixed to the filter unit 15th connected. But it is also conceivable that the filter assemblies 13th the filter unit 15th are designed to be removable, for example, for cleaning purposes. During an operation of the household appliance 1 , especially during cleaning and / or drying processes, it must be ensured that the individual filter assemblies 15th firmly in the filter unit 15th are anchored. By applying the fluid 35 on the filter assemblies 13th these must not be torn out of their anchorage and thus interfere with a filtering process.

Furthermore, the filter assemblies 13th essentially arcuate. The filter assemblies 13th but can also be in a slightly bent configuration, as in 3 shown, be formed. However, it is also conceivable that the filter assembly can be hook-shaped, banana-shaped or any other shape. In 3 instructs the filter unit 15th seven filter assemblies 13th on. But there are also more or less filter assemblies 13th conceivable. To ensure a long running time without cleaning the filter unit 15th To ensure it is an advantage if the filter unit 15th from the top of the device 12a almost to the bottom of the device 12b extends. Depending on the space available in the household appliance 1 can the filter unit 15th vary in their design and be made larger or smaller.

As in 3 shown, the upper filter area 21st the overflow edge 25 on. The direction of flow of the fluid 35 is in the overflow area 27 shown in the direction of arrow C. Deposits of fluid particles 39 are in 3 for example on the first two filter assemblies 13th shown, the filter input 31 are arranged closest. These fluid particles 39 can consist of hair, fibers from clothing or shoes, fats, sand, leftover food, microplastic particles and / or dust or dirt particles. Depending on how often the filter unit 15th is cleaned and depending on how heavily soiled the laundry is, more filter assemblies can be used 13th with dirt particles or fluid particles 39 be wetted.

The following briefly describes a filtering process of the filter unit 15th described.

The fluid 35 flows through the filter inlet 31 in the direction of arrow A into the filter unit 15th a. After passing the filter inlet 31 hits the fluid 35 on the filter input 31 nearest filter assembly 13th and flows through this first filter assembly 13th . Due to the arrangement of the multiple filter assemblies 13th in 3 , needs the fluid 35 all filter assemblies 13th the filter unit 15th pass through, the fluid particles 39 essentially from that of the filter inlet 31 nearest filter assembly 13th be filtered out. If the filtering process is already advanced, it can be done as in 3 is shown, already to deposits of the fluid particles 39 come.

Is a filter assembly 13th such with fluid particles 39 wetted so that the fluid 35 no longer through a filter membrane 19th a filter assembly 13th can flow, the fluid flows 35 over the overflow edge 25 in the direction of arrow C into that of the filter assembly through which flow is not allowed 13th closest filter assembly 13th . So that the fluid 35 into the overflow 27 needs a filter assembly 13th not have become completely impervious to flow. A partial impermeability is already sufficient for the fluid to rise 35 within a filter assembly 13th off so the fluid 35 to the downstream filter assemblies 13th flows. The fluid 35 flows over the overflow for so long 27 in a downstream filter assembly 13th up a filter assembly 13th is achieved at which the fluid 35 through the filter membrane 19th can flow. It can happen that the fluid 35 along a meandering filter path 37 flows. Under meandering filter web 37 it is understood that the fluid 35 in the filter unit 15th a path through the arrangement of the filter assemblies 13th seeks so that it reaches a filter assembly to be flown through and to the filter outlet 33 got.

In 4th is a further embodiment or a further arrangement of the filter assemblies 13 of the filter unit according to the invention 15th shown. a filter unit 15th with essentially identical filter assemblies 13th shown. The filter assemblies 13th differ from the filter assemblies 13th in 3 whereas the filter assemblies 13th have a different orientation.

The multiple filter assemblies 13th extend in 4th from the bottom of the device 12b towards the top of the device 12a down. In the embodiment in 4th are for example five filter assemblies 13th shown. Again, there are more than five or less than five filter assemblies 13th conceivable. But it is also conceivable that the filter assemblies 13th on one of the side walls 40 or on both side walls 40 of the filter housing 29 adjoin.

Furthermore, there is the overflow 27 the filter assembly arranged last in series 13th designed such that the fluid 35 to the filter outlet 33 can flow if it overflows 25 the one from the filter inlet 31 furthest filter assembly 13th flows. However, it is also conceivable that the filter assembly arranged last in a row 13th on one of the side walls and / or on the top of the device 12a the filter unit 15th can border. Furthermore is in the area of the device base 12b a viewing window 41 formed by which a user enters the filter unit 15th can see whether the filter unit 15th for example needs to be cleaned. The viewing window 41 but can also be at another point on the filter unit 15th be trained.

In 5 are the filter assemblies 13th arranged in a cascade. Furthermore, the filter assemblies 13th arched, here almost parabolic. As shown are the filter assemblies 13th connected to one another and thus form a filter assembly agglomerate 43 , which consists of several individual filter assemblies 13th consists. In 5 are four filter assemblies 13th shown. The number of filter assemblies 13th but can vary depending on the desired embodiment and filter performance.

Since the fluid 35 in the filter unit 15th only flows driven by gravity, it must be ensured that the fluid 35 after flowing through one or more of the several filter assemblies 13th the filter unit 15th through the filter outlet 33 leaves.

The overflow 27 or the overflow edges 25 of each filter assembly 13th fulfill the same function or follow the same principle as described above. Only the arrangement and, if applicable, the type of fastening of the filter assemblies 13th and / or the overflow edges 25 differ from the embodiments explained in more detail above.

In 6 is a schematic of a greatly simplified representation of the circulation principle of a household appliance 1 shown for treating laundry. The household appliance 1 for treating laundry has a receiving area 47 for items to be cleaned and / or dried, for example laundry or dishes. There is fluid during a cleaning and / or drying process 35 in the receptacle 47 . During a pumping over and / or pumping out process, the fluid is 35 by means of a pumping unit 53 via an outlet opening 49 from the receptacle 47 into a pumping or pumping out line 51 pumped.

The pumping unit 53 is powered by a drive unit 55 driven, the drive unit 55 from a control unit 57 is driven or controlled. The drive unit 55 is with the control unit 57 via a transmission element 59 coupled. The pumping unit 53 pumps the fluid 35 to the filter housing 29 the filter unit 15th in which the fluid 35 is filtered. After the filter unit 15th the fluid flows 35 either in a drain 61 and leaves the household appliance 1 from or via a return line 51a to an inlet port 63 who have favourited the fluid 35 back to the recording area 47 of the household appliance 1 leads. But it is also conceivable that the fluid 35 , for example in a washing machine, via the detergent dispenser 5 Is performed and is mixed there, for example, with detergent and / or fabric softener before the fluid 35 into the receptacle 47 is fed in.

List of reference symbols

1.

Home appliance

3.

Washing machine front wall

5.

Detergent bowl

7th

Washing machine display unit

9.

Washing machine door

11.

Cleaning hatch cover

12a.

Device top

12b.

Device bottom

13th

Filter assembly

15th

Filter unit

17th

Filter frame

19th

Filter membrane

21st

Upper filter area

23

Lower filter area

25.

Overflow edge

27

Overflow

29

Filter housing

31.

Filter input

33.

Filter output

35.

Fluid

37.

Filter web

39.

Fluid particles

40.

Side wall

41.

Viewing window

43.

Filter assembly agglomerate

47.

Recording area

49.

Outlet opening

51.

Pumping line

51 a.

Return line

53.

Pumping unit

55.

Drive unit

57.

Control unit

59.

Transmission element

61.

Drain

63.

Inlet opening

Arrow A

Fluid inlet

Arrow B

Fluid outlet

Arrow c

Fluid overflow

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 7467636 B2 [0004]
• US 5779812 A [0005]

Claims (13)

Household appliance (1) for treating laundry, with an appliance base (12b) and an appliance top (12a), the appliance top (12a) being arranged opposite the appliance base (12b), a pump unit (53) for pumping over and / or pumping out the at a cleaning and / or drying process present fluid (35), a drive unit (55) for essentially driving the pump unit (53), a control unit (57) for controlling the drive unit (55), a filter unit (15) for filtering the fluid (35), wherein the filter unit (15) comprises several filter assemblies (13), characterized in that the several filter assemblies (13) are arranged in series and the several filter assemblies (13) are each fluidically connected via at least one overflow (27). Household appliance (1) according to Claim 1 , characterized in that the filter unit (15) has a filter inlet (31) and a filter outlet (33), the fluid (35) flowing through the filter inlet (31) into the filter unit (15) and the fluid (35) flowing along a The filter web (37) flows to the filter outlet (33) and flows out of the filter unit (15) through the filter outlet (33), the fluid (35) flowing along the filter web (37) essentially due to gravity. Household appliance (1) according to Claim 1 or 2 , characterized in that the filter unit (15) preferably extends almost from the top of the device (12a) to almost the bottom of the device (12b). Domestic appliance (1) according to one of the preceding claims, characterized in that the plurality of filter assemblies (13) each have an upper filter area (21) and a lower filter area (23), the upper filter area (21) in the area of the top of the appliance (12a ) and the lower filter area (23) is arranged in the area of the device base (12b) and an overflow edge (25) of the overflow (27) is formed in the upper filter area (21) and / or lower filter area (23). Household appliance (1) according to Claim 4 , characterized in that the fluid (35) acts on the filter assembly (13) arranged closest to the filter inlet (31), the plurality of filter assemblies (13) being arranged such that the fluid (35) over at least one overflow edge (25) one Overflow (27) flows into a closest filter assembly (13) when the fluid (35) acted upon filter assembly (13) is essentially impervious to flow due to deposition of fluid particles (39). Domestic appliance (1) according to one of the preceding claims, characterized in that the plurality of filter assemblies (13) are essentially arc-shaped. Domestic appliance (1) according to one of the preceding claims, characterized in that the plurality of filter assemblies (13) are constructed essentially identically over the filter web (37). Domestic appliance (1) according to one of the preceding claims, characterized in that the plurality of filter assemblies (13) are arranged in a cascade. Household appliance (1) according to one of the preceding claims, characterized in that when all filter assemblies (13) become essentially impervious to flow, the fluid (35) flows along a meandering filter path (37) into the filter outlet (33). A method for filtering fluids (35) in a household appliance (1) for treating laundry, with an appliance base (12b) and an appliance top (12a), the appliance top (12a) being arranged opposite the appliance base (12b), a pump unit ( 53) for pumping over and / or pumping out the fluid (35) present during a cleaning and / or drying process, a drive unit (55) for essentially driving the pumping unit (53), a control unit (57) for controlling the drive unit (55) , a filter unit (15) for filtering the fluid (35), the filter unit (15) comprising a plurality of filter assemblies (13), characterized in that the plurality of filter assemblies (13) are arranged in series and the plurality of filter assemblies (13) are arranged over at least an overflow (27) are fluidically connected. Procedure according to Claim 10 , characterized in that the fluid (35) is pumped via the pump unit (53) to a filter inlet (31) through which the fluid (35) flows into the filter unit (15), so that the fluid (35) through the Due to gravity, it flows through the filter unit (15) along a filter web (37) and at least one of the plurality of filter assemblies (13) is applied and filtered through a filter outlet (33) flows out of the filter unit (15), the filter web (37) from the filter inlet (31) extends to the filter outlet (33). Procedure according to Claim 10 or 11 , characterized in that the fluid (35) through the The filter inlet (31) flows to a filter assembly (13) arranged closest to the filter inlet (31) and the air flows through the acted upon filter assembly (13) until the filter assembly (13) is essentially impervious to flow. Method according to one of the Claims 10 to 12th , characterized in that when a filter assembly (13) is essentially impervious to flow, the fluid (35) flows over an overflow edge (25) of the overflow (27) to a filter assembly (13) closest to the essentially impenetrable filter assembly (13).

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