WO2011076685A1

WO2011076685A1 - Filter device, household appliance, and method for filtering

Info

Publication number: WO2011076685A1
Application number: PCT/EP2010/070080
Authority: WO
Inventors: Frank Kohlrusch; Andreas Ziemann
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2009-12-22
Filing date: 2010-12-17
Publication date: 2011-06-30
Also published as: CN102686793B; EP2516720B1; CN102686793A; PL2516720T3; DE102009055208A1; EP2516720A1

Abstract

The filter device according to the invention, which is in particular part of a household appliance according to the invention, serves for filtering a liquid (K) and comprises: a valveless filter container (1; 1a) having an inlet (2) connected to a first outlet (3) and to a second outlet (4) without filtering, a first flow channel (SL) connected to the first outlet and comprising a blocking valve (VE2), a second flow channel (AW) connected to the second outlet and not blockable for adjusting a filter setting, wherein a first minimum flow cross section of the first outlet and/or the first flow channel is greater than a second minimal flow cross section of the second outlet and/or the second flow channel, so that the liquid can be pumped from the inlet through a filter element (6), the first outlet, and the first flow channel in a first filter setting when the blocking valve is opened, and the liquid can be pumped unfiltered from the inlet through the second outlet and the second flow channel in a second filter setting when the blocking valve is closed. The invention further relates to a corresponding method.

Description

Filter device, domestic appliance and method of filtering

The invention relates to a filter device with a filter container, a domestic appliance, in particular laundry drying apparatus, and a method for filtering a liquid.

In general, a domestic appliance in the form of a laundry drying machine with a closed process air circuit is known which has a heat exchanger coupled to an internal process air circuit, the heat exchanger serving to cool and condense moist heat of process air discharged from a laundry drum. The heat exchanger may be, for example, an air-to-air heat exchanger or a heat exchanger of a heat pump.

WO 2008/1 1961 1 A1 describes a method and a flushing device for cleaning a component, in particular an evaporator, a heat pump, and a washing or tumble dryer with such a device. For cleaning the arranged within the process air circuit component during a running drying process condensate, which is recovered in the process air cycle from the drying of wet laundry and collected in a condensate water pan, directed to a provided above the component washing out and by its sudden opening on the outlet side delivered as water surge to the component to be cleaned. In particular, with the flushing device lint and other impurities can be cleaned. The water, which is then heavily flocced, then returns to the condensate water tank after the flushing process. However, it is disadvantageous that this condensate used as flushing liquid itself contains lint, which can accumulate during cleaning or rinsing of the component to be cleaned, which reduces a cleaning effect.

There is also known a laundry drying apparatus in which, after the completion of a drying process, the contents of the condensate water tank can be pumped off automatically into a drain.

It is the object of the invention to provide in a domestic appliance a particularly simple and maintenance-free possibility for providing a purified liquid from a contaminated product. allow liquid to be allowed. It is also an object to provide in a clothes dryer a simple, maintenance-free way to provide purified rinse water from lint-laden condensate water. This object is achieved according to the features of the independent claims. Preferred embodiments are in particular the dependent claims and the following description removable.

The above object is achieved by a filtering device for filtering a liquid (e.g., condensed water) of a domestic appliance, the filtering device comprising:

(a) a valveless filter container having an inlet which is fluidically connected to a first outlet through at least one filter element and which is not fluidically connected to a second outlet (ie without a filter element being located between the inlet and the second outlet),

(B) a first flow channel, which is connected to the first outlet and having a shut-off valve, and

(c) a second flow passage connected to the second drain and not closable for adjustment of a filter position, wherein a first minimum flow area of the first drain and / or the first flow passage is greater than a second minimum flow area of the second drain and / or the second flow channel, so that in a first filter position in which the shut-off valve is opened, the liquid from the inlet through the filter element, the first drain and the first flow channel is pumpable and in a second filter position in which the shut-off valve blocks Liquid from the inlet is pumped unfiltered through the second outlet and the second flow channel.

That the second flow channel is not shut off for a setting of a filter position, means that it has no valve that is operated for a change in the filter position or is operable. For other purposes, e.g. For blocking during transport of the domestic appliance, a valve may be present in the second flow channel.

The fact that the first minimum flow cross section of the first drain and / or the first flow channel is greater than the second minimum flow cross section of the second drain and / or the second flow channel can also be expressed as a first flow resistance of the first drain and the first flow channel is less than a second flow resistance of the second drain and the second flow channel. The flow cross sections can each be adjusted by appropriate spacers or reducers.

That in the first filter position, in which the shut-off valve is opened, the liquid from the inlet through the filter element, the first drain and the first flow channel is pumpable, comprises that in the first filter position, the liquid or not essential through the second sequence and the second flow channel is pumpable, since the second flow resistance is too high or the second flow cross section is too low for it. In other words, the flow cross sections and correspondingly the flow resistances are designed so that in the first filter position, a high volume flow and consequently a low pressure of the liquid is formed, wherein the pressure is not sufficient to convey the liquid through the second sequence.

An advantage of this filter device is that with only one valve in the first flow channel, the liquid streams in both flow channels can be switched on and off alternately. As a result, it is possible to dispense with a valve in the second flow channel, so that, firstly, the filter device can be produced more cheaply and, secondly, the second flow channel is free of failures.

It is a preferred embodiment that the first minimum flow cross section, at least in sections, is more than twice as large as the second minimum flow cross section, in particular at least 2.5 times as large. As a result, it is effectively achieved that in the first filter position, a high volume flow and a low pressure of the liquid is formed, wherein the pressure is insufficient to convey the liquid through the second sequence.

It is a particularly preferred embodiment that the first minimum flow cross-section, at least in sections, is at least about three times as large as the second minimum flow cross-section. As a result, a pressure build-up in the filter container, which would allow a fluid flow through the second outlet in the first filter position, is prevented particularly effectively. It is a further preferred embodiment that the first minimum flow cross section has a diameter of about 15 mm to 20 mm, in particular about 20 mm, and the second minimum flow cross section has a diameter of about 7 mm. First, these dimensions allow an effective prevention of the liquid flow through the second outlet in the first filter position and, secondly, a sufficiently strong liquid flow through the second outlet in the second filter position.

It is yet another preferred embodiment that the first outlet has the first minimum flow cross section and the second outlet has the second minimum flow cross section. In other words, then at least the processes are the places with the smallest flow cross-section. The fluidically subsequent flow channels can have the same or a larger flow cross-section. For example, the processes can be designed in the form of nozzles, to which respective flow channels can be attached in the form of hoses. The hoses may in particular have a slightly larger cross-section than the associated sockets or the same cross section.

Alternatively, the location of the smallest flow area may be located in a flow channel, e.g. by means of a reducer inserted in a hose or pipe.

It is also a further preferred embodiment that the second flow channel has no valve, so not for other purposes than a change in the filter position. This results in a particularly simple embodiment. In general, for example, a flow channel may simply be formed with a single tube or tube.

It is also a preferred embodiment that the first flow channel leads to a washing container. As a result, the filtered liquid, in particular filtered condensate water, can be used for cleaning one or more components of a domestic appliance, in particular laundry drying apparatus, for example an evaporator of a heat exchanger. Alternatively, the first flow channel may lead directly to a heat exchanger and / or to another component to be cleaned with the filtered liquid.

It is a further preferred embodiment that the second flow channel leads to a drain. As a result, heavily lint-laden liquid is removed from the domestic appliance, which reduces a lint contamination.

Alternatively, the second flow channel lead to a condensate water tank. Thus, a fluid loss can be avoided.

It is still a preferred embodiment that the filter container comprises: a chamber with the inlet, the first outlet and the second outlet and the filter element, which is arranged between the inlet and the first outlet and the chamber in an inlet-side first chamber part and a second Subdivided chamber part, wherein the filter container can be aligned so that the inlet is arranged below the filter element and the filter element is arranged below the first outlet and wherein the second outlet opens into the first chamber part.

Thereby, a liquid which flows from the inlet through the filter element and further through the first outlet, e.g. is pumped up, lint or other contaminants on one side of the filter element deposit. If this liquid flow is reversed, z. B. by a pumping operation is stopped and the liquid due to gravity drops down, the lint are detached from the filter element and can then be easily removed by the second sequence.

This filter container has, inter alia, the advantage that it allows maintenance-free operation without manual intervention by a user with high filter performance. The filter container is also very easy and inexpensive to produce. The filter element may have as a filter medium, for example, a sieve, gauze, fleece, etc.

It may be a preferred embodiment that the inlet and the first outlet open opposite into the chamber. This allows a high flow rate be achieved in the filter position. In addition, it is particularly easy to achieve a uniform backflow and thus complete detachment of lint. Furthermore, a particularly simple structure is thus achievable. For a simple connection of the filter container, the second sequence with respect to the inlet can advantageously open laterally into the chamber. As a result, a flow velocity between the inlet and the second inlet can be reduced in comparison with a straight-line or opposing arrangement. It may be an alternative preferred embodiment that the inlet and the second outlet open opposite into the chamber. Then, in particular, the first outlet with respect to the inlet can be arranged laterally on the chamber.

For the fluidic connection of the inlet to the second outlet, the filter element can have an opening which tightly surrounds the second outlet. For a simple and straight-flow geometry, the opening may preferably be a central opening.

It is also a preferred embodiment that a storage volume is present in the first outlet and / or in the first flow channel. Thus, after switching off the pump for the return flow of the liquid present in the first outlet and in the first flow channel by emptying the storage volume, a longer-lasting and larger-volume liquid flow can be generated, which in turn improves a rinsing effect. The storage volume may, for example, be in the form of a significant channel widening, e.g. a hose widening. Also, the storage volume may be considered as a volume integrated into the filter container, e.g. a chamber, wherein the storage volume can be arranged in the pumping direction at or behind the drain. The storage volume can furthermore be a separately produced storage housing or container introduced into the first flow channel.

The object is also achieved by a domestic appliance with at least one such filter device. The household appliance can then be provided, for example, with water laced with fluff o. Ä. Contaminated water. Except a relief in the operation of the device and avoidance of incidents (overflow, blockage, low cleaning performance, etc.) can also be saved fresh water.

Preferred embodiments of the domestic appliance in the context of the technically possible at all possible preferred embodiments of the filter device and vice versa, and this even if it is not explicitly indicated herein.

Particularly advantageously, the filter device can be used in a clothes dryer, since there can be effectively cleaned without or with only a small supply of fresh water by linting contaminated components and a conventional emptying a lint can (separate lagoons, condensate water tank) can be omitted.

It may be particularly preferred that the inlet is connected to a pump and / or with a condensate water tank and the first outlet is connected to a flushing device. As a result, a cleaning effect can be maintained over an entire drying process.

The object is also achieved by means of a method for filtering a liquid through a valveless filter container having a chamber into which an inlet, a first outlet and a second outlet open, wherein the first outlet is connected to a first, closable flow channel and the second outlet is connected to a second, not lockable flow channel, wherein in a first filter position:

a liquid is forced through the inlet into the chamber, in particular pumped,

- Then flows through a filter element in the chamber and

then flows as a filtered liquid substantially only through the first drain and in the first flow channel,

wherein a flow of the liquid through the second flow is prevented by a first flow resistance of the first drain and the first flow channel being substantially smaller than a flow resistance of the second drain and the second flow channel,

and in a self-cleaning step

the first flow channel is shut off, so that the liquid is forced through the inlet into the chamber, in particular pumped, and

then flows as unfiltered liquid through the second drain and in the second flow channel.

Here, too, there is the advantage that, by shutting off only the first flow channel, the liquid streams in both flow channels can be switched on or off alternately. This makes it possible to dispense with shutting off and opening the second flow channel, so that, firstly, the filter device can be produced more cheaply and, secondly, the second flow channel is free of failures.

It is a preferred development that the method in the first filter position has a step of stopping the pump for a predetermined period, in particular before switching to the second filter position. Thus, a cleaning of the filter container can be provided by a backflow of liquid from the first outlet and the first flow channel.

Incidentally, in the context of the technically possible at all possible preferred embodiments of the filter device or of the domestic appliance, preferred embodiments of the method and vice versa correspond, and this also if this is not explicitly stated herein.

In the figures of the accompanying drawings, embodiments of the invention are shown schematically and described in more detail in the following description. It can be provided with the same reference numerals for better clarity identical or equivalent elements.

1 shows a schematic diagram of a laundry drying apparatus with selected components that are helpful for understanding the invention, including a filter container;

FIG. 2A shows a first liquid course through some of the components of the laundry drying apparatus from FIG. 1, which are provided for supplying a useful liquid;

Fig. 2B shows a second liquid flow through the components of Fig. 2A; 3 shows a sectional side view of a filter container according to a first embodiment;

4 shows a sectional view in an oblique view of the filter container according to the first embodiment in a more detailed exploded view;

5 shows a sectional view in an oblique view of the assembled, even more detailed filter container according to the first embodiment; and FIG. 6 shows a sectional side view of a filter container according to a second embodiment. 1 shows a laundry drying device in the form of an exemplary tumble dryer WG. The tumble dryer WG has a closed process air circuit with a laundry drum WT and a process air duct PL adjoining on both sides. In the laundry drum WT laundry W is overflowed by warm and dry process air, which thereby absorbs moisture from the laundry W. The then moist-warm process air is subsequently sucked out of the laundry drum WT through the process air duct PL to a condensation unit VD (which in a conventional tumble dryer may correspond to a water or air-cooled condensation unit and in the case of a heat pump can correspond to a condensation unit VD) and into the condensation unit VD cooled. As a result, the water vapor contained in the process air condenses and drains off as condensate water K into a condensate water tank KW. The process air cool behind the condensation unit VD is further drawn in by a blower G and subsequently blown by a heating unit H (which may correspond to an electrically operated heater in a conventional tumble dryer and which may correspond to a condenser in a heat pump). In the heating unit H, the process air is heated and blown again as dry-warm air into the washing drum WT. In the laundry drum WT, the process air absorbs, in addition to the moisture from the laundry W, fluff which in the following circulation through the process air duct PL partially attaches to the condensation unit VD and reduces its efficiency and partially reaches the condensate water tank KW with the condensate water K. , The blower G can also be arranged at another location in the process air duct PL.

For a cleaning of the condensation unit VD, a flushing device SP can be provided, which by means of a pump P the condensate water K through a riser SL pumped up in a washing container SB, where it is first collected and discharged as needed by opening a valve VE1 through a downpipe FR to the condensation unit VD. As a result, cooling fins can be overflowed in the condensation unit VD with condensate water K at high speed and so entrained. Thus, the condensation unit VD should be freed from the lint. The fluffy condensate water K is then returned to the condensate water tank KW. In known tumble dryers, the problem arises that a cleaning of the condensation unit VD with the lint-containing condensate water K results in only a limited cleaning effect, since the fluff of the drained from the washing tank SB condensate K can be deposited again at the condensation unit VD. In the case of the present laundry drying appliance WG, however, the lint-containing condensate water K is pumped out of the condensate water tub KW through a filter container 1, which serves to convey the condensate water K flowing in at an inlet 2 as purified condensate water K through a first outlet 3 into the washing container SB. terzuleiten.

FIG. 2A shows a first liquid course resulting in a filter position through some of the components of the laundry drying apparatus WG from FIG. 1, which are provided for supplying the purified condensate water K as the useful liquid. The course of the liquid is indicated in black. The components comprise the condensate water sump KW, the pump P, the filter container 1, the riser SL, a shut-off valve VE2 introduced between the first outlet 3 and the washing container SB and a sewer AW connected to a second outlet 4. The sewer AW can lead eg back into the condensate water tank KW. In the filter position shown, the shut-off valve VE2 is opened so that the still unfiltered condensate water K is pumped by means of the pump P to the inlet 2 of the filter device 1, the filter device 1 passes through and thereby filtered and further from the first outlet 3 through the riser SL is pumped up into the washing container SB. By the second sequence 4 runs in the filter position little or no condensate K. This is achieved in that a flow resistance of the condensate K through the second drain 4 and the sewer AW is far higher than a flow resistance of the condensate K through the first flow. 3 and the riser SL. In other words, the flow cross-section through the first outlet 3 and the riser SL designed so that a high volume flow and a low pressure of the condensate water K form, the pressure is not sufficient to promote the condensate water K through the second drain 4 and the sewer AW. The current through the second drain 4 is thus not blocked by a valve or other shut-off blocking, so that there is a particularly maintenance-free and inexpensive solution. For self-cleaning of the filter container 1, the pump P is stopped. As a result, condensate water K located in the riser SL flows back through the filter container 1, taking with it the adhering lint. Subsequently, the shut-off valve VE2 is closed and thus the clothes drying device WG transferred to the self-cleaning position. In the riser SL a storage volume BV is introduced in order to be able to maintain the liquid flow for a longer period of time for a return flow of the liquid for a thorough cleaning.

FIG. 2B shows a second liquid course through the components shown in FIG. 2A in a self-cleaning position. In the self-cleaning position, the shut-off valve VE2 is closed and the pump P pumps the condensate water K displaced with the entrained fluff through the second outlet 4 and the sewer AW from the filter container 1 and further to a drain or back into the condensate water trough KW. Since the drain branch formed by the second drain 4 and the sewer AW is valveless, it also does not need to be switched open.

By means of the use of the filter container 1, the condensation unit VD can be cleaned better. The filter container 1 can be actuated automatically, for example, by means of a control unit, not shown here, and / or by user interaction, e.g. for activating a self-cleaning function of the tumble dryer WG. The structure and the mode of operation of the filter device will be explained below with reference to various embodiments. The filter container 1, the pump P, the shut-off valve VE2, a shut-off valve, not shown, to the sewer AW and / or the riser SL can be regarded as parts of a filter device.

5 shows a sectional view in an oblique view in a further detailed exploded view and Figure 5 shows a sectional view in an oblique view as a composite device shown in more detail a filter container 1 a according to a first embodiment, for example Ver - 1 as a filter container 1 in FIG. 1 to FIG. 2B. The filter container 1 a has a chamber 5, in which opens in the orientation shown here, the inlet 2 from below. In the chamber 5, a filter element 6 is arranged in the form of a lint filter, which subdivides the chamber 5 into a first chamber part 5a and a second chamber part 5b. In the first chamber part 5a open both the inlet 2 and - this directly opposite - the second outlet 4, while the first outlet 3 opens into the second chamber part 5b. For this purpose, the second outlet 4 is partially formed as a nozzle 7, which extends from a chamber wall 8 of the chamber 5, starting through the second chamber part 5b to a central opening 9 in the filter element 6. The filter element 6 and the nozzle 7 are sealed against each other, so that no parasitic currents can pass the filter element 6. A housing 10 of the filter container 1 a is constructed here of two housing parts 10 a and 10 b, wherein the filter element 6 is inserted between the two sections 10 a and 10 b. A cross section of the first drain 3 is about 20 mm, while a minimum cross section of the second drain 4 is considerably lower, namely here about 7 mm about one third of it. The filter element 6 can be inserted for the assembly of the filter container 1 a in the lower housing part 10 a and sealed with an O-ring 1 1 to the outside. For assembly, the upper housing part 10 b can then be placed with pressure on the lower housing part 10 a, whereby both the filter element 6 and the O-ring 1 1 between the two housing parts 10 a, 10 b are held.

In the filter position, as e.g. As shown in Fig. 2A, a flow passage (e.g., riser SL) associated with the first drain 3 is open. In this position, condensate water K flows from the inlet 2 to the first outlet 3, through the filter element 6. Fluff or other suspended particles are retained in the condensate water K on the upstream side of the filter element 6, and that discharged through the first outlet 3 Condensate water K is cleaned of these lint, etc.

In the case of this filter container 1 a, by selecting the cross section of the first outflow 3 in comparison to the cross section of the second outflow 4, the corresponding volume flows through the outflows 3 and 4 can be set. In particular, the cross-section of the first outlet 3 can be selected to be comparatively large enough that a pressure in the chamber 5 when the first outlet 3 is open is so small that no substantial volume flow through the second inlet 4 results, although this is not obstructed. Of the Flow cross-section of the first outlet 3 may be, for example, at least twice as large, preferably at least three times as large as the flow cross-section of the second drain 4. An adjustment of the flow cross sections already at the processes 3 and 4 has the advantage that they are not adjusted in connected flow channels will need so that simple hoses can be attached to the processes 3 and 4, for example, lead up to the washing tank SB, the drain or to the condensate water tank KW.

For self-cleaning of the filter container 1 a, a pumping up of the condensate water K is stopped by the inlet 2, for example by stopping the pump P shown in Fig.1 to Fig.2B thereby flows in the second chamber part 5b, in the first sequence 3 and possibly in a subsequent flow channel (eg, the riser SL of Figure 1) located condensate K back through the filter element 6 and further through the inlet 2. This backflow lifts the at the inlet side, here: lower, side of the filter element located fluff. Subsequently, the first sequence 3 is shut off and it is the pumping resumed, z. B. by a reconnection of the pump P. As a result, the particularly flocculent condensate K is now removed through the nozzle 7 and the second outlet 4 from the filter device 1 a, for example, in the sewer AW. To return to the filter position of the flow channel is opened by the first sequence 3 again.

This filter container 1 a has the advantage that it manages without moving parts and only by a suitable blocking and opening the process 3 provides both an effective filter performance and a simple self-cleaning option.

6 shows a filter container 1 b according to a second embodiment, which can also be used as the filter device 1 in Figure 1. In contrast to the filter device 1 a of the first embodiment, the first outlet 3 is now opposite the inlet 2, while the second outlet 4 opens laterally into the first chamber part 5 a. This can be dispensed with an opening in the filter element 6 and a provision of a nozzle 7. In addition, there is the advantage that during self-cleaning, the backflowing or returning condensate water K flows through the filter element 6 substantially uniformly, while in the first embodiment behind the nozzle 7 results in a flow shadow, in which lint adhered to the filter element 6 can stay. The housing 10 of the filter device 1 b is designed in two parts, wherein the filter element 6 is fixed between the two housing parts 10 a and 10 b.

Of course, the present invention is not limited to the exemplary embodiments shown.

Thus, other home appliances may be equipped with the filter container or filter device, e.g. a dishwasher, the impurities may then be, for example, leftovers.

In general, the first sequence can be used to provide a useful liquid, which in particular can be a rinsing liquid. In this case, for example, can be dispensed with a washing. The processes are not limited to a rectangular arrangement on the filter container, but may also lead to each other at different suitable angles in the chamber.

The flow cross sections can also be adjusted at the downstream of the processes 3 and 4 flow channels (eg the riser SL or the sewer AW), for example by reduction pieces.

LIST OF REFERENCE NUMBERS

1 filter device

1 a filter device

1 b filter device

2 inlet

3 first sequence

4 second sequence

5 chamber

5a first chamber part

5b second chamber part

6 filter element

7 nozzles

8 chamber wall

9 opening in the filter element

10 housing

10a housing part

10b housing part

1 1 O-ring

AW sewer

BV storage volume

FR downpipe

G blower

H heating unit

K condensate water

KW condensate water tray

P pump

PL process air duct

SL riser

SP flushing device

SB washing container

VD condensation unit

VE1 valve VE2 shut-off valve

W laundry

WG laundry drying machine

WT laundry drum

Claims

claims

A filter device for filtering a liquid (K) of a domestic appliance, comprising:

a valveless filter container (1; 1 a; 1 b) having an inlet (2) fluidly connected to a first outlet (3) by at least one filter element (6) and not fluidly connected to a second outlet (4) a first flow channel (SL) which is connected to the first outlet (3) and which has a shut-off valve (VE2),

a second, flow channel (AW), which is connected to the second outlet (4) and is not shut off for setting a filter position, wherein a first minimum flow cross-section of the first outlet (3) and / or the first flow channel (SL) is greater as a second minimum flow cross-section of the second drain (4) and / or the second flow channel (AW), so that

in a first filter position, in which the shut-off valve (VE2) is opened, the liquid (K) from the inlet (2) through the filter element (6), the first outlet (3) and the first flow channel (SL) is pumpable, and

in a second filter position, in which the shut-off valve (VE2) blocks, the fluid (K) from the inlet (2) is pumped unfiltered through the second outlet (4) and the second flow channel (AW).

2. Filter device according to claim 1, wherein the first minimum flow cross section at least in sections more than twice as large as the second minimum flow cross section, in particular at least 2.5 times as large.

3. Filter device according to claim 2, wherein the first minimum flow cross section, at least in sections, at least about three times as large as the second minimum flow cross section.

4. Filter device according to claim 3, wherein the first minimum flow cross section has a diameter of about 20 mm and the second minimum flow cross section has a diameter of about 7 mm.

5. Filter device according to one of the preceding claims, wherein the first outlet (3) has the first minimum flow cross section and the second outlet (4) has the second minimum flow cross section.

6. Filter device according to one of the preceding claims, wherein the second flow channel (AW) has no valve.

7. Filter device according to one of the preceding claims, wherein the first flow channel (SL) leads to a washing container (SB).

8. Filter device according to one of claims 1 to 6, wherein the first flow channel (SL) leads to a heat exchanger (VD).

9. Filter device according to one of the preceding claims, wherein the second flow channel (AW) leads to a drain.

10. Filter device according to one of claims 1 to 8, wherein the second flow channel (AW) leads to a condensate water sump (KW).

1 1. Filter device according to one of the preceding claims, wherein the filter container (1, 1 a, 1 b) comprises:

a chamber (5) with the inlet (2), the first outlet (3) and the second outlet (4) and

the filter element (6), which is arranged between the inlet (2) and the first outlet (3) and divides the chamber (5) into an inlet-side first chamber part (5a) and a second chamber part (5b),

wherein the filter container (1; 1 a; 1 b) is alignable so that the inlet (2) is arranged below the filter element (6) and the filter element (6) is arranged below the first outlet (3) and

wherein the second drain (4) opens into the first chamber part (5a).

12. Filter device according to one of the preceding claims, wherein in the first outlet (3) and / or in the first flow channel (SL), a storage volume (BV) is present. Domestic appliance (WG), in particular laundry drying apparatus, with a filter device for filtering a liquid (K) of the household appliance, comprising:

Domestic appliance (WG) according to claim 13, wherein the inlet (2) of the at least one filter container (1; 1 a; 1 b) with a pump (P) and / or with a condensate water tank (KW) is connected and the first sequence ( 3) is connected to a purging device (SB, FR).

A method for filtering a liquid through a valveless filter container (1; 1 a; 1 b) having a chamber (5) into which an inlet (2), a first outlet (3) and a second outlet (4) open, wherein the first outlet (3) is connected to a first, closable flow channel (SL) and the second outlet (4) is connected to a second, non-closable flow channel (AW), wherein

in a first filter position

a liquid (K) is pressed, in particular pumped, through the inlet (2) into the chamber (5), then in the chamber (5) a filter element (6) flows through and

then as a filtered liquid (K) substantially only through the first drain

(3) and flows in the first flow channel (SL),

wherein flow of the liquid (K) through the second drain (4) is prevented by a first flow resistance of the first drain (3) and the first flow channel (SL) being substantially less than a flow resistance of the second drain (4) and second flow channel (AW),

in a self-cleaning step

the first flow channel (SL) is shut off, so that

the liquid (K) through the inlet (2) pressed into the chamber (5), in particular pumped, and

then flows as unfiltered liquid (K) through the second outlet (4) and in the second flow channel (AW).