EP2422010A1

EP2422010A1 - Household laundry dryer and filtering method

Info

Publication number: EP2422010A1
Application number: EP10713954A
Authority: EP
Inventors: Klaus Grunert; Frank Kohlrusch; Andreas Ziemann
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2009-04-21
Filing date: 2010-04-15
Publication date: 2012-02-29
Anticipated expiration: 2030-04-15
Also published as: DE102009002540A1; CN102414360B; US8863401B2; CN102414360A; WO2010121942A1; EA201171248A1; PL2422010T3; EP2422010B1; US20120024801A1; EA019148B1

Abstract

The household laundry dryer (WG) has at least one filter container (1; 1a; 1b; 1c), wherein the at least one filter container (1; 1a; 1b; 1c) has at least: a chamber (5) with an inlet (2) for condensate water (K) to be cleaned, and also with a first outlet (3), a second outlet (4) and a filter element (6) which is arranged between the inlet (2) and the first outlet (3) and which divides the chamber (5) into an inlet-side first chamber part (5a) and a second chamber part (5b), wherein the filter container (1c) can be aligned such 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 outlet (4) opens out into the first chamber part (5a).

Description

Household laundry drying apparatus and method for filtering

The invention relates to a household laundry drying apparatus, with a filter container and a method for filtering condensate water in a household laundry dryer.

In general, laundry drying devices having a closed process air circuit are known which have a heat exchanger coupled to the process air circuit, the heat exchanger serving to cool and condense moist warm process air discharged from a laundry drum. The heat exchanger can be, for example, an air-to-air heat exchanger or a heat exchanger of a heat pump.

For example, WO 2008/1 1961 1 A1 describes a method and a flushing device for cleaning a component, in particular an evaporator of a heat pump, and a washing or tumble dryer with such a device. To clean the arranged within the process air circuit component 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 heat exchanger and out through its sudden opening on the outlet side as a surge of water on the delivered to be cleaned component. 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. In this case, however, it is disadvantageous that the condensate water used as rinsing liquid itself contains lint, which can accumulate during the cleaning or rinsing on the component to be cleaned, which reduces a cleaning effect. To remove the lint from the condensate water tank this can be removed and emptied after a drying process from the laundry dryer. On some clothes dryers, the condensate water tank can be automatically pumped into a drain.

The generic foreign DE 1 410 851 relates generally to dry cleaning equipment and to chemical cleaning processes and in particular to an improved hydraulic flow circuit for a dry cleaning appliance, wherein the chemical cleaning During cleaning, the solvent is not only constantly filtered, but also renewed during the subsequent operating periods of the program, so that the hydraulic flow circuit is prepared for a new programmed sequence of operation. The filter device may comprise a plurality of porous tubes, which are arranged in a filter housing and are supported by a separation or divider plate, so that the entire solvent flowing through the filter device flows through the tubes, which consist of a conventional design and a coating of a Filter aid, such as diatomaceous earth, to narrow the pores and make the filter more effective at filtering out 1 micron size and smaller sized debris. An automatic, gravity backwashing of the tubes may be performed by a quantity of fully filtered solvent located above the separator plate. This ensures that the pipes are in a clean state at the end of each backwash. Instead of the filter tubes, filters of various designs with differently shaped filter surfaces can be used to obtain the same results. A non-generic dry cleaning apparatus having a cleaning liquid filtering apparatus having porous tubes which can be cleaned by backwashing is also known from GB 1 025 081. However, the two documents cited are limited to the dry cleaning and its special requirements, which are typically unsuitable for household use. Thus, the filters are due to the tubes used, which are required for the very small pore diameter in the cleaning of the cleaning liquid, consuming, bulky and expensive and not suitable for a cleaning of condensate water.

It is the object of the invention to provide a maintenance-free possibility for providing purified water from contaminated water, in particular condensate water, in a domestic appliance. In particular, it can be an object to provide a maintenance-free possibility for providing purified rinsing water from lint-laden condensate water in a laundry drying appliance.

This object is achieved according to the features of the independent claims. Preferred embodiments are in particular the dependent claims. The object is achieved by means of a household laundry drying device, wherein the household laundry drying device has at least one filter container, the at least one filter container each having at least: a chamber with an inlet for condensate water to be cleaned, a first outlet and a second outlet and a filter element, which is arranged between the inlet and the first outlet and divides the chamber into an inlet-side first chamber part and a second 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 sequence opens into the first chamber part.

As a result, a liquid, in particular the condensate water flowing 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. For example, by stopping a pumping operation and lowering the liquid by gravity, the lint is detached from the filter element and can then be easily removed through the second drain.

This filter container of the household laundry drying apparatus has, inter alia, the advantage that it enables 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 household appliance can be provided so easily and inexpensively from with lime o. Ä. Contaminated water purified water. In addition to facilitating the operation of the device and avoiding incidents (overflow, blockage, low cleaning performance, etc.), fresh water can also be saved. In addition, a conventional emptying a lint can (separate flusendepot, condensate water tank) omitted.

The filter element may have as a filter medium, for example, a sieve, gauze, fleece, etc. The filter element may in particular be designed as a lint filter. In general, the filter element can have one or more, in particular thin, filter layers, wherein the filter layers can each have the screen, the gauze, the nonwoven, etc. The one or more filter layers can be designed in particular as a substantially planar layer (s). It is an embodiment that the first sequence is connected to a flushing device, wherein the flushing device is in particular provided to flush one or more components of the household laundry drying device for its or their cleaning. In particular, the rinsing device is provided for a purging, and thus cleaning, of a heat exchanger. The heat exchanger may, in the event that the household clothes dryer has a heat pump, in particular, flush an evaporator. Consequently, components contaminated by lint can be cleaned effectively without or with only a small supply of fresh water.

It may be a further embodiment that the inlet and the first outlet open opposite into the chamber. As a result, a high flow velocity in the filter position can be achieved. 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 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 may be a further embodiment that the second outlet is at least partially formed as a nozzle, which extends from a chamber wall through the second chamber part to at least the opening in the filter element, wherein the nozzle at a flow through the chamber from the inlet to the first sequence (eg at a Filtering) can be closed by means of a flow body, and wherein the nozzle is not completely closed in a return flow from the first flow to the inlet by means of the flow body (eg in a self-cleaning process), for example by lifting the flow body of the nozzle. As a result, a self-switching valve function can be integrated into the filter device, which has a particularly simple structure and, for example, needs only a single movable element, for example the flow body. This embodiment can be easily implemented, in particular in the event that the inlet and the second outlet open into the chamber opposite.

It may in particular be a configuration that the nozzle is not completely closed by the flow body during flow through the chamber from the inlet to the second outlet.

Advantageously, the first outlet or a flow channel connected to the first outlet can have a larger flow cross-section than the second outlet or a flow channel connected to the second outlet. As a result, a passive valve function can be controlled particularly easily by means of the flow body. This valve function ensures that the filter element either flows through in the filter position or is bypassed in the self-cleaning position. Alternatively or additionally, the first drain may be equipped with a filtered water reservoir.

A particularly simple circuit of the valve function in the self-cleaning position can be achieved in that the flow body does not completely close the nozzle in a flow through the chamber from the inlet to the second outlet.

The filter container of the household laundry drying apparatus can be regarded as a filter apparatus which has a first outlet and a second outlet, wherein over the first sequence in a household appliance, a purified water as the use liquid, in particular rinsing liquid, can be fed and at least in the first sequence a filter element for filtering the liquid is arranged, and via the second sequence, the water from the household appliance is removable, wherein in a first position, the purified water through the first outlet and the at least one filter element is pumpable and in a first position, the water through the first expiration and the at least one filter element is drainable in the reverse direction, and wherein in a second position, the water is removable through the second drain.

However, this filter device is not dependent on the presence of the filter container. Thus, the at least one filter element can also be used in the first sequence. The first drain may be formed as a one-piece or as a multi-part drain channel. A branch of the first flow and the second flow can, for. B. occur at a Y-shaped branch.

The household laundry drying device may preferably have at least one shut-off valve which is connected to at least one of the drains of the filter container.

It may be advantageous if the household laundry drying device has a pump which is connected to the inlet of the filter container.

is connected to a condensate water tank (directly or, for example, with an intermediate pump) and the first drain 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 water in a household laundry drying apparatus, wherein in the method (a) in a filtering step (i) the water to be filtered is pumped through an inlet into a chamber, (ii) then in the Chamber through which a filter element flows and (iii) then filtered out of a first outlet; and (b) in a self-cleaning step, pumping the water through the inlet is stopped so that at least a portion of the water flows back through the filter element.

It is a further development that at least one component of the household laundry drying device, in particular heat exchanger, is rinsed with the filtered water emerging from the first outlet. In the following figures, the invention will be described schematically with reference to exemplary embodiments. 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 which are helpful for the understanding of the invention,

2 shows a sectional side view of a filter container according to a first embodiment of the invention;

3 shows a sectional side view of a filter container according to a second embodiment of the invention;

4 shows a sectional view in exploded view of a filter container according to a third embodiment of the invention;

5A shows a sectional view of the filter device according to the third embodiment of the invention in a filter position;

Fig. 5B shows the filter device according to the third embodiment of the invention in a self-cleaning position.

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 weighing 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 an evaporator VD of a heat pump (in general: to a heat exchanger) and cooled in the evaporator VD. 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 cooled behind the evaporator VD is further drawn in by a blower G and subsequently blown through a heater H. In the heater H, the process air is heated up and blown into the laundry drum WT again as dry-warm air. sen. In the laundry drum WT, the process air except the moisture from the laundry W also absorbs lint, which partially accumulate in the following circulation through the process air duct PL to the evaporator VD and reduce its efficiency and partially reach the condensate water tank KW with the condensate water K.

For cleaning the evaporator VD, a flushing device SP can be provided which can pump the condensate water K by means of a pump P through a riser SL in a washing container SB, in which it collected first and if necessary by opening a valve VE1 gushing through a downpipe FR is drained to the evaporator VD. As a result, cooling fins in the evaporator VD can be overflowed with condensate water K at high speed and thus entrained. So the vaporizer VD should be freed from the lint. The lint-laden condensate water K is then passed back into the condensate water tank KW. In conventional clothes dryers, the problem arises that a cleaning of the evaporator 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 on the evaporator VD.

In the present laundry drying appliance WG, however, the lint-laden condensate water K is pumped out of the condensate water tank KW through a filter container 1, which serves the condensate water K flowing in at a feed 2 in a filter position as purified condensate water K through a first outlet 3 into the washing container SB forward and direct in a self-cleaning position by a second flow 4 with the dissolved from the filter tank 1 lint into the sewer AW. Alternatively, the second sequence 4 can lead back into the condensate water tank KW. The first drain 3 and / or the second drain 4 may be closed by means of respective shut-off valves, e.g. Shut-off valves are shut off, as indicated here by way of example by a valve VE2 introduced between the first outlet 3 and the rinsing tank SB.

By means of the use of the filter container 1, the evaporator VD can be better cleaned. The filter container 1 can be actuated automatically, for example by means of a control unit, not shown here, and / or by a user interaction, eg for activating a self-cleaning function of the tumble dryer WG. Hereinafter the structure and operation of the valve 1 will be explained 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.

FIG. 2 shows a filter container 1a according to a first embodiment, for example for use as the filter container 1 in FIG. The filter container 1a has a chamber 5, into which in the orientation shown here, the inlet 2 opens from below. In the chamber 5, a filter element 6 is arranged in the form of a lint filter, which divides the chamber 5 into a first chamber part 5a and a second chamber part 5b. The lint filter here has a flat filter layer or Sieblage. 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 1a is constructed here of two housing parts 10a and 10b, wherein the filter element 6 is inserted between the two sections 10a and 10b.

In the filter position, a flow channel associated with the second outlet 4 is shut off, while a flow channel associated with the first outlet 3 is open. Such a filter position can correspond in FIG. 1 to a position in which liquid in the form of condensate water K is pumped by means of the pump P to the inlet 2 of the filter device 1 or 1a and is further pumped up from the first outlet 3 into the washing container SB. 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.

For self-cleaning of the filter container 1a, a pumping up of the condensate K through the inlet 2 is stopped, for example by stopping the process shown in FIG As a result, condensate water K located in the second chamber part 5b, in the first outlet 3 and optionally in an adjoining flow channel (eg the riser SL of FIG. 1) flows back through the filter element 6 and on through the filter element 6 Inlet 2. This backflow lifts off the lint located on the inlet-side, here: lower, side of the filter element 6.

Subsequently, the first sequence 3 are shut off and the second sequence 4 is opened, and it is the pumping action resumed, z. B. by a restart of the pump P in Fig.1. As a result, the condensate water K, which is particularly affected by linting, is now removed from the filter device 1a through the connection 7 or the second outlet 4, for example into the sewer AW from FIG.

In order to return to the filter position, the flow channel is opened by the first outlet 3 and the flow channel is closed by the second outlet 4.

This filter container 1a has the advantage that it manages without moving parts and only by a suitable blocking and opening the processes 3 and 4 provides both an effective filter performance and a simple self-cleaning option.

3 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 embodiment of FIG. 2, the first outlet 3 now faces the inlet 2, while the second outlet 4 opens laterally into the first chamber section 5a. 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 in the self-cleaning, the returning or returning condensate water K flows through the filter element 6 substantially uniformly, while in the first embodiment according to Figure 2 behind the nozzle 7 results in a flow shadow, in which lint on the filter element. 6 can stick to it. 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.

4 shows a filter container 1 c according to a third embodiment, which is also usable as the filter container 1 in Figure 1. The filter container 1c is a development of the basic form shown in Figure 2 according to the first embodiment. This appendix see shows that the filter element 6 can be inserted to assemble the filter container 1c in the lower housing part 10a and can be sealed with an O-ring 1 1 to the outside. For assembly, the upper housing part 10b can then be placed with pressure on the lower housing part 10a, whereby both the filter element 6 and the O-ring 11 are held between the two housing parts 10a, 10b. 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.

In addition to the filter device 1 a shown in Figure 2, a flow body 12 is now at least partially axially movable in the nozzle 7 and partially in the first chamber part 5a. The flow body 12 has a lower, the inlet 2 opposite sealing disc 13 and directed to the nozzle 7 and axially guided in this guide member 14. The operation of this filter device 1 c will be described in greater detail in FIGS. 5A and 5B, FIG. 5A showing the filter device 1c in a filter position and FIG. 5B showing the filter device 1c in a self-cleaning position.

In the filter position shown in FIG. 5A, the drain 3 is opened (eg by the shut-off valve VE2 in FIG. 1 being open), so that condensate water K flows up through the inlet 2 into the first chamber part 5a, for example pumped up by the pump P. becomes. Due to the large cross-section of the first start-up 3, a high volume flow and a high flow velocity are formed. The flow body 12 is arranged in the flow, which is supported by the opposite arrangement of the inlet 2 and the second outlet 4 and a small distance of the associated orifices in the first chamber part 5a. The flow body 12 can be pressed in the flow conditions of the filter position in the flow direction against gravity close to the nozzle 7. As a result, the second sequence 4 is shut off. The liquid, for example in the form of condensate water K, flows around the flow body 12 through the filter element 6 into the second chamber part 5b and further through the first drain 3, for example to the washing container SB. The flow body 12 thus forms together with the nozzle 7 thus a flow-dependent 'passive' shut-off valve. During the transition to the self-cleaning position shown in FIG. 5B, condensate water K is no longer pumped into the inlet 2, for example by switching off the pump P. As a result, condensate water K (eg residual liquid) flows up due to gravity or is located higher than the first outlet 3 the first outlet connected liquid channels such as hoses or pipes, for example, the riser SL) back into the chamber 5 and further through the inlet 2. The impurities (lint, etc.) located on the underside of the filter element 6 are detached from the filter element 6 and carried away. Due to the absence of upwardly directed flow of the filter position and supported by the return flow, the flow body 12 sinks due to gravity and supported by the backflow downwards in the direction of the inlet 2 and releases the nozzle 7.

Following, e.g. after a few seconds, the first drain 3 is shut off, e.g. by closing the shut-off valve VE2, and again condensate water K pumped through the inlet 2. However, the cross-section of the second drain 4 is too small to allow a flow to be established which is sufficient to be able to press the flow element 12 sealingly onto the nozzle 7 again. Rather, the nozzle 7 remains open towards the first chamber part 5a, so that now the condensate water K displaced with the cleaned fluff can run off unfiltered through the second outlet 4 and can be removed, e.g. into the sewer AW or back into the condensate water tank KW.

In this filter container 1 c can thus by a selection of a cross section of the respective processes 3 and 4, a cross section of the downstream flow channels SL (hose, pipe, etc.), a flow channel length of the downstream flow channels SL and / or a delivery height can be achieved that a volume flow in the filter position and a volume flow in the self-cleaning position differ significantly. This asymmetry in the volume flows causes the movably mounted flow body 12 to close the second outlet 4 in the filter position and can not close it in the self-cleaning position. Such a switching characteristic may e.g. be adjusted by fixing the mass of the flow body with.

Of course, the present invention is not limited to the embodiments shown. So also other household appliances may be equipped with the filter container or the filter device, for example a dishwasher, wherein the contaminants may then be, for example, leftovers.

A shut-off of a drain or an associated flow channel can be carried out by means of at least one valve. In this case, the at least one valve may be part of the filter container and / or may be part of the filter device connected to the filter container. The processes or the associated flow channels can be shut off individually or by means of one or more common valves.

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 operations are not limited to a rectangular arrangement, but may also result in other suitable angles to each other in the chamber.

LIST OF REFERENCES

1 filter device 1a filter device 1 b filter device 1c filter device

2 inlet

3 first sequence

4 second outlet 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 10 a housing part 10 b housing part 11 0-ring

12 flow body

13 sealing washer

14 leadership

AW sewer FR downpipe

G blower

H heating

K condensate water

KW condensate water tray P pump

PL process air duct

SL riser

SP flushing device

SB washing container VD evaporator

VE1 valve

VE2 shut-off valve

W laundry

WG laundry drying machine

WT laundry drum

Claims

claims

1. Household laundry drying apparatus (WG), comprising at least one filter container (1, 1a, 1b, 1c), wherein the at least one filter container (1, 1a, 1b, 1c) has at least: a chamber (5 ) with an inlet (2) for condensate water (K) to be cleaned, a first outlet (3) and a second outlet (4) and a filter element (6) arranged between the inlet (2) and the first outlet (3) and the chamber (5) is subdivided into an inlet-side first chamber part (5a) and a second chamber part (5b), wherein the filter container (1; 1 a; 1 b; 1c) is alignable such 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 outlet (4) opens into the first chamber part (5a).

2. Domestic laundry drying apparatus (WG) according to claim 1, wherein the first outlet (3) with a purging device (SB, FR), in particular purging device (SB, FR) for a heat exchanger, is connected.

3. Household laundry drying device (WG) according to one of the preceding claims, in which the inlet (2) and the first outlet (3) open into the chamber (5).

4. Household laundry drying apparatus (WG) according to claim 3, wherein the second outlet (4) with respect to the inlet (2) opens laterally into the chamber (5,5a).

5. Household laundry drying apparatus (WG) according to one of claims 1 or 2, wherein the inlet (2) and the second outlet (4) opposite in the chamber (5, 5 a) open.

6. Household laundry drying apparatus (WG) according to claim 5, wherein the first outlet (3) with respect to the inlet (2) is arranged laterally on the chamber (5).

7. Household laundry drying device (WG) according to one of claims 5 or 6, wherein the filter element (6) has an opening (9), in particular central opening, which surrounds the second outlet (4, 7) tight.

8. Domestic laundry drying apparatus (WG) according to claim 7, wherein the second outlet (4) is at least partially formed as a nozzle (7) which from a chamber wall (8) through the second chamber part (5 b) to at least to the opening (9) in the filter element (6) extends, wherein the nozzle (7) is closed at a flow through the chamber (5) from the inlet (2) to the first outlet (3) by means of a flow body (12), and wherein the nozzle (7) at a

Return flow from the first outlet (3) to the inlet (2) by means of the flow body (12) is not completely closed.

9. Household laundry drying apparatus (WG) according to claim 8, wherein the nozzle (7) at a flow through the chamber (5) from the inlet (2) to the second

Drain (4) by means of the flow body (12) is not completely closed.

10. Household laundry drying apparatus (WG) according to one of the preceding claims, wherein the first outlet (3) or a flow path (SL) connected to the first outlet (3) has a larger flow cross-section than the second outlet (4) or a flow channel connected to the second drain (4).

11. Domestic laundry drying apparatus (WG) according to one of the preceding claims, wherein the filter element (6) comprises a lint filter.

12. Household laundry drying apparatus (WG) according to one of the preceding claims, wherein the inlet (2) of the at least one filter container (1, 1 a, 1 b, 1 c) with a condensate water tank (KW) is connected.

13. A method for filtering water (K) in a household laundry drying apparatus (WG), wherein in a filtering step the water to be filtered (K) is pumped through an inlet (2) into a chamber (5), then a filter element (6) flows through in the chamber (5), particles which are to be filtered being retained on the filter element (6), and - then exits as a filtered water (K) from a first outlet (3); and in a self-cleaning step, the pressing, in particular pumping, of the water (K) is stopped by the inlet (2), so that at least part of the water (K) flows back through the filter element (6).

14. The method of claim 13, wherein at least one component of the household laundry drying device (WG), in particular heat exchanger (VD), with the from the first flow (3) exiting filtered water (K) is rinsed.