EP3585238A1

EP3585238A1 - Dishwasher comprising a hydraulic arrangement for cleaning a filter device, and method

Info

Publication number: EP3585238A1
Application number: EP18704536.4A
Authority: EP
Inventors: Anton Oblinger
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2017-02-21
Filing date: 2018-02-09
Publication date: 2020-01-01
Also published as: US11166615B2; CN110381794B; US20190328205A1; WO2018153686A1; DE102017202783A1; CN110381794A

Abstract

The invention relates to a dishwasher (1), in particular a domestic dishwasher, comprising a first hydraulic arrangement (31), by means of which wash ware accommodated in a dishwashing compartment (2) is washed using a dishwashing fluid, the first hydraulic arrangement (31) having a spray device (14), which is arranged in the dishwashing compartment (2), having a sump (15), which is arranged beneath the dishwashing compartment (2), having a filter device (16), which is arranged in the dishwashing compartment (2) and/or the sump (15) and is intended for filtering the dishwashing fluid, and having a circulating pump (18), which is intended to circulate the dishwashing fluid to the spray device (14), and also comprising a second hydraulic arrangement (32), by means of which the filter device (16) is cleaned using a cleaning fluid, the second hydraulic arrangement (32) having the filter device (16), the sump (15), a pump arrangement (18, 19), a storage device (22) for accommodating the cleaning fluid, a cleaning device (17) for spraying at least one portion of the filter device (16) with the cleaning fluid, and an additional pump (20), which is arranged between the storage device (22) and the cleaning device (17) and is intended for subjecting the cleaning fluid to pressure, and to an operating method therefor.

Description

Dishwasher with hydraulic arrangement for cleaning a filter device and method

The present invention relates to a dishwasher with a first hydraulic arrangement for rinsing dishes and a second hydraulic arrangement for cleaning a filter device of the dishwasher and a method for operating such a dishwasher.

A dishwasher may have a hydraulic circuit arrangement for rinsing items to be washed received in a rinse container by circulating a rinse liquid from a sump in the lower region of the rinse container to a spray device. The hydraulic circuit arrangement may comprise a filter device arranged above the pump pot, for example a screen cylinder, for filtering dirt particles from the dishwashing liquid. Such a filter device should be cleaned at regular intervals for optimum flushing performance.

EP 2 462 857 A1 describes a dishwashing machine with rotating sieves which rotate along a sword geometry, with comminution of dirt particles through overpressure and underpressure.

WO 201 1/076650 A1 shows additional spraying devices in the center of a screen cylinder, which clean the radially outer screen cylinder by means of a volume flow from a circulation pump by means of pressurization, wherein water is in the screen cylinder.

DE 3 745 169 C2 describes a rotating cup-shaped filter and one with a line connected to a fresh water inlet, which has an outlet opening from which a fresh water jet is directed onto the rotating filter, while a discharge pump is in operation.

Against this background, the object of the present invention is to improve the automatic cleaning of a filter device of a dishwasher. According to a first aspect, a dishwasher, in particular a domestic dishwasher, is proposed, which has a first hydraulic arrangement for rinsing items taken in a rinse container by means of a rinsing liquid and a second hydraulic arrangement for cleaning a filter means by means of a cleaning liquid. The first hydraulic arrangement comprises a spraying device arranged in the washing container, a pumping pot arranged below the washing container, the filter device arranged in the washing container and / or the pumping pot for filtering the washing liquid and a circulating pump which is set up to circulate the washing liquid to the spraying device. The second hydraulic arrangement comprises the filter device, the pump pot, a pump arrangement, a storage device for receiving the cleaning liquid, a cleaning device for spraying at least a portion of the filter device with the cleaning liquid and an additional pump arranged between the storage device and the cleaning device for pressurizing the cleaning liquid. The first hydraulic system is in particular a hydraulic circuit in which rinsing fluid is circulated in order to rinse items which is accommodated in at least one rinsing container arranged in the Spülgutaufnahme.

The rinsing fluid or rinsing fluid is water that may be mixed with chemicals such as rinsing agent or rinse aid, circulated by the circulating pump in a circuit for rinsing the items to be washed, and may contain dirt particles.

The spraying device comprises at least one device for spraying the washware with the washing liquid. The respective device may be, for example, a rotating spray arm or a nozzle fixedly installed in the washing compartment.

The sump is a below the washing container arranged receptacle for liquid as a template for a pump, such as the circulation pump or a drain pump. The filter device is formed, for example, by one or more sieves and arranged such that the rinsing liquid after spraying the items to be washed passes through the filter device in order to get into the sump, so that absorbed by the rinsing liquid Dirt particles can be at least partially retained by the filter device.

The second hydraulic system can be a hydraulic circuit or an arrangement of hydraulic devices which is at least temporarily not closed to a closed circuit. Some of the hydraulic devices of the second hydraulic system may also be included in the first hydraulic system. In the second hydraulic arrangement, a cleaning liquid for cleaning the filter device is conveyed and / or circulated. The cleaning liquid may be the rinsing liquid or another liquid.

The pump assembly is an assembly of one or more pumps, each configured to pump cleaning fluid from the sump during cleaning of the filter device. The pumps of the pump assembly can be operated simultaneously or alternately.

The storage device serves to hold cleaning liquid for cleaning the filter device. The storage device may be a float tank, a tank of a heat exchanger, a condenser tank of a heat pump dishwasher, a water bag or any other hollow vessel or reservoir which is suitable for receiving cleaning liquid. The reservoir has, for example, a receiving volume of between 1 l and 10 l and preferably 2 l.

The cleaning device is an assembly of one or more devices, such as exit ports or nozzles, that are collectively configured to spray at least a portion of the filter device with the cleaning fluid. The cleaning device may be stationary or movable relative to the filter device, wherein the filter direction in turn can be stationary or relative to the cleaning device movable. The auxiliary pump is an additional pump, which in particular is not included in the first hydraulic arrangement for rinsing the items to be washed and is designed to pressurize the cleaning liquid.

By means of the auxiliary pump, the volume flow and the pressure of the cleaning liquid during spraying of the filter device can be chosen independently of the parameters of the circulating pump with regard to an optimum cleaning effect for the filter device.

By combining the additional pump with the storage device for receiving the cleaning liquid as a template for the additional pump advantageously eliminates the need for a separate pressure valve for fresh water to clean the filter device.

When the water is removed for cleaning the storage device, the storage device may be at least partially filled with rinsing liquor, whereby the fresh water consumption for cleaning the filter device is reduced.

According to one embodiment of the dishwasher, the pump arrangement of the second hydraulic arrangement comprises the circulating pump, which is also set up to circulate the cleaning liquid to the storage device.

When the pump assembly includes the circulation pump, the second hydraulic assembly may form a hydraulic circuit in which cleaning liquid is circulated from the pump circuit to the storage device, thereby reducing the water consumption for cleaning the filter device due to multiple use of the same cleaning liquid.

According to one embodiment of the dishwasher, the pump arrangement of the second hydraulic arrangement comprises a drain pump for conveying the cleaning fluid into a sewer line.

If the pump assembly includes the drain pump or discharge pump, polluted cleaning fluid can be pumped into the sewage. According to one embodiment of the dishwasher, a water diverter is arranged between the circulating pump, the spraying device and the storage device, wherein an inlet of the water diverter is connected to an outlet of the circulating pump, a first outlet of the water diverter is connected to an inlet of the spraying device and a second outlet of the water diverter is connected to an inlet of the storage device.

The water diverter is a device having an inlet and a plurality of outlets configured to dispense inlet liquid via the plurality of outlets.

The water switch allows rinsing liquid, which is circulated in the first hydraulic arrangement, to be conducted at least partially into the storage device and thus at least partially to form the cleaning liquid from the rinsing liquid.

According to one embodiment of the dishwasher, the cleaning liquid is at least partially formed from the rinsing liquid.

By using rinsing liquid as the cleaning liquid, the fresh water consumption for cleaning the filter device can advantageously be reduced. Furthermore, the chemicals contained in the rinsing liquid can develop a cleaning action for the filter device.

According to one embodiment of the dishwasher, the storage device has a fresh water connection for filling the storage device with fresh water, and the cleaning liquid is at least partially formed from fresh water.

The fresh water connection allows the storage device to be filled with fresh water, for example at the beginning of the cleaning of the filter device. By using fresh water, the purity of the cleaning liquid is increased. According to one embodiment of the dishwasher, the storage device has a metering device for adding chemicals to the cleaning liquid in the storage device.

For example, the dosing device may be an automatic dosing system (ADS), and the chemicals may be one or more agents such as rinsing agents, rinse aids, or other chemicals that enhance the cleaning action of the cleaning fluid for the filter device. The addition of chemicals to the cleaning liquid in the storage device is particularly advantageous if the cleaning liquid is formed from fresh water.

According to one embodiment of the dishwasher, the filter device comprises a number of sieves. For example, a sieve of the number of sieves may be a horizontally arranged flat sieve. Further, a sieve of the number of sieves may be formed so as to form the outer surface of a vertically disposed body having upper and lower openings.

According to one embodiment of the dishwasher, a sieve of the number of sieves of the filter device is designed as a sieve cylinder. In a variant of the present embodiment, the cleaning device can be arranged within the screen cylinder and be adapted to spray cleaning liquid in particular radially outward against the inner circumferential surface of the screen cylinder.

In a further variant of the present embodiment, the cleaning device can be arranged outside the screen cylinder and be adapted to spray cleaning liquid radially inwardly at an angle against the radial direction inwards or tangentially against the outer surface of the screen cylinder. Depending on the arrangement of the cleaning device according to the variants mentioned, the cleaning of the filter device can take place in the current direction or in the counterflow direction. According to one embodiment, a volume flow of the auxiliary pump is smaller than a volume flow of the pump arrangement. If the pump assembly pumps cleaning fluid with a volume flow which is greater than the volume flow with which the auxiliary pump delivers the cleaning fluid to the cleaning device, this leads in that no cleaning liquid collects in the vicinity of the section of the filter device sprayed by the cleaning device.

If the sprayed section of the filter device is, for example, a screen cylinder, then according to the present embodiment, while the screen cylinder is being sprayed with cleaning liquid, there is no liquid column in the screen cylinder. As a result, the cleaning effect for the screen cylinder is improved. In particular, it is thus prevented that a liquid column standing in the screen cylinder brakes the cleaning liquid sprayed out of the cleaning device before striking the screen cylinder, provided that the cleaning device is arranged inside the screen cylinder. If the cleaning device is arranged outside the screen cylinder, it is prevented that dirt particles dissolved by the sprayed cleaning device from the filter are prevented from leaving the screen cylinder.

According to one embodiment of the dishwasher, the auxiliary pump for pressurizing the cleaning liquid is set up with an additional pressure between 0.5 bar and 20 bar.

With a high pressurization by the auxiliary pump as in the present embodiment, the cleaning effect can be improved over a case in which the pressurization of the cleaning liquid, for example, by a circulating pump. While a circulating pump is designed, for example, at low pressures that do not damage the washware introduced into the wash compartment, higher pressures can be realized with the auxiliary pump in order to improve the cleaning action for the filter device.

According to a second aspect, a method for operating a dishwasher, in particular a domestic dishwasher, is proposed. The method comprises: rinsing items to be washed received in a rinse container by circulating a rinsing liquid in a first hydraulic arrangement by means of a circulating pump and cleaning the filter apparatus by means of cleaning liquid in a second hydraulic arrangement. The first hydraulic arrangement comprises a spraying device arranged in the washing container, a pumping pot arranged below the washing container, a filter device arranged in the washing container and / or the pumping pot for Filtering the rinsing fluid and the circulation pump. The second hydraulic arrangement comprises the filter device, the pump pot, a pump arrangement, a storage device for receiving the cleaning liquid, a cleaning device and an additional pump arranged between the storage device and the cleaning device. The cleaning of the filter device by means of the cleaning fluid in the second hydraulic system comprises: pumping the cleaning fluid from the storage device to the cleaning device under pressure by means of the auxiliary pump, spraying at least a portion of the filter device with the cleaning fluid by means of the cleaning device and pumping the cleaning fluid from the pump well by means of the pump assembly ,

The embodiments and features described for the proposed dishwasher apply to the proposed method accordingly.

Further advantageous embodiments of the dishwasher are the subject of the dependent claims and the embodiments of the dishwasher described below. In the following, the dishwasher will be explained in more detail on the basis of preferred embodiments with reference to the enclosed figures.

Fig. 1 shows a schematic perspective view of an embodiment of a dishwasher;

FIG. 2 shows a schematic cross-sectional view of an exemplary embodiment of a washing container of the dishwasher according to FIG. 1; FIG.

Fig. 3 shows a schematic functional representation of a first embodiment of hydraulic arrangements of the dishwasher;

Fig. 4 shows a schematic functional representation of a second embodiment of hydraulic arrangements of the dishwasher;

Fig. 5 shows a schematic view of an embodiment of a memory device; and 6 shows a flow chart of an embodiment of a method for operating a dishwasher.

In the figures, identical or functionally identical elements bear the same reference numerals, unless stated otherwise.

1 is a schematic perspective view of an embodiment of a dishwasher 1. The dishwasher 1 is a household dishwasher. The dishwasher 1 has a body, which comprises a washing container 2, and a door 3. The rinsing container 2 and the door 3 form a rinsing chamber 4 for rinsing dishes. The door 3 is shown in Fig. 1 in its open position. By pivoting about a provided at a lower end of the door 3 pivot axis S, the door 3 can be closed or opened. The rinsing container 2 is, for example, cuboidal and may comprise a base 5, a ceiling 6 opposite the base 5, a rear wall 7 opposite the door 3 and two side walls 8, 9 lying opposite one another. In particular, the side walls 8, 9 may be made of stainless steel sheet. The dishwasher 1 further comprises at least one Spülgutaufnahme 10. In particular, a plurality of Spülgutaufnahmen 10 may be provided, which may include a lower basket, an upper basket and / or a cutlery drawer. The plurality of Spülgutaufnahmen 10 are preferably arranged one above the other in the washing compartment 2. Each Spülgutaufnahme 10 is selectively displaceable in an insertion direction 12 in the washing compartment 2 into an initial position or in an extension direction 13 out of this out into an end position. For this purpose, a rail 1 1 is provided in the example of Figure 1 on both sides of a respective Spülgutaufnahme 10. The dishwasher 1 can be, for example, a freestanding, an integrated or a fully integrated dishwasher 1.

FIG. 2 shows a schematic cross-sectional view of a washing container 2 of a dishwasher 1 according to FIG. 1. In the washing container 4, not shown items to be washed in the Spülgutaufnahmen 10 can be arranged. Below the respective Spülgutaufnahmen 10 respective spray arms 14a, 14b are arranged, which form a spray device 14 for spraying the items to be washed in the Spülgutaufnahmen 10 with rinsing liquid. In the region of the bottom 5 of the washing container 2, a pump pot 15 with downstream circulating pump 18 is provided, which flows via fluid lines (not shown). is technically connected to the spray 14. The sump 15 is here exemplarily fluidically connected to a drain line in which a drain pump 19 is arranged for pumping out contaminated rinsing liquid from the sump 15. As is apparent from Fig. 2, the top of the pump pot 15 is covered with a flat, funnel-shaped filter element 16 a. In the filter element 16a, a screen cylinder 16b is inserted. The filter element 16a and the screen cylinder 16b form a filter device 16. The screen cylinder 16b serves as a section of the filter device 16, which filters out dirt particles that could block the circulation pump 18 and / or the drain pump 19. For further details on sump 15 and filter device 16 reference is made to WO 2009/077286 A1, which is hereby incorporated by reference in its entirety.

The filtered dirt particles can clog the screen cylinder 16b and reduce the flushing capacity of the dishwasher, which is why automatic cleaning of the screen cylinder 16b is provided in the dishwashing machine 1. For this purpose, a cleaning device 17 for spraying the jacket of the screen cylinder 16b with cleaning liquid is arranged in the sump 15 in the vicinity of the screen cylinder 16b. In Fig. 2, the cleaning device 17 is circumferentially formed around the outer surface of the screen cylinder 16b. Alternatively, the cleaning device 17 may also be arranged in the interior of the screen cylinder 16b. The cleaning device 17 is fluidly connected to an upstream auxiliary pump 20, the cleaning fluid pressurized and promotes the cleaning device 17.

3 shows a schematic functional representation of a first exemplary embodiment of hydraulic arrangements 31, 32 of the dishwasher 1.

In particular, FIG. 3 shows hydraulic devices 14, 15, 16, 17, 18, 19, 20, 21, 22 forming a first hydraulic assembly 31 and a second hydraulic assembly 32. The first hydraulic arrangement 31 is a hydraulic circuit arrangement and comprises the spray device 14, the filter device 16, the sump 15, the circulation pump 18 and a water switch 21. The filter device 16 in particular comprises a screen cylinder 16b. The aforementioned hydraulic devices 14, 16, 15, 18, 21 of the first Hydraulic assembly 31 are connected via fluid lines indicated as dashed arrows liquid lines together to form a circuit. The first hydraulic arrangement 31 is set up for rinsing the items to be washed received in the rinsing container 2 from FIGS. 1, 2 in a rinsing mode. In the rinsing mode, rinsing liquid is conveyed by the circulating pump 19 out of the sump 15 via the water diverter 21 to the spraying device 14 in the rinsing container 2, which sprays the rinsing liquid received in the rinsing container 2 with the rinsing liquid. The rinsing liquid mixes with dirt particles adhering to the items to be washed, and the rinsing liquid mixed with dirt particles falls from the items to be washed onto the bottom 5 of the rinsing container 2 and runs through the filter unit 16, in particular the sieve cylinder 16b, into the sump 15. The screen cylinder 16b filters out dirt particles from the rinsing liquid. During the rinsing mode, a liquid column of rinsing liquid is present in the sump 15 and / or the sieve cylinder 16b. From the sump 15, the rinsing liquid is circulated again in the direction of water distributor 21 and spray 14. It should be noted that the first hydraulic arrangement 31 can furthermore be provided with a rinsing fluid connection, not shown, via which the rinsing liquid is supplied to the first hydraulic arrangement 31 at the beginning of the operation of the dishwasher 1 in the rinsing mode described above. The rinsing liquid is, for example, fresh water to which chemicals have been added. The flushing liquid can be taken, for example, from a fleet storage, as shown in FIG. 5 and described later.

The second hydraulic arrangement 32 is a hydraulic circuit arrangement and comprises the filter device 16, in particular the screen cylinder 16b, and the pump pot 15, the circulation pump 18, the water switch 21, a storage device 22, the auxiliary pump 20 and the cleaning device 17. The aforementioned hydraulic devices 16, 15th , 17, 18, 20, 21, 22 of the second hydraulic assembly 32 are fluidly connected to each other via fluid lines indicated by solid arrows. Where a dashed and a solid arrow are parallel, it can each be a same liquid line, which is used by both the first hydraulic assembly 31 and the second hydraulic assembly 32. The second hydraulic arrangement 32 is set up to clean the screen cylinder 16b by means of cleaning liquid in a cleaning mode. In the cleaning mode, cleaning conveyed liquid from the auxiliary pump 20 from the storage device 22 to the cleaning device 17 and thereby subjected to a pressure of, for example, between 0.5 to 20 bar. Such a high pressure would, for example, be detrimental to wash ware received in the washing container 2, for which reason the circulating pump 18, which is also included in the first hydraulic device 31, is not set up to generate such a high pressure. For the filter device 16, however, such a high pressure is harmless. The auxiliary pump 20 is therefore not subject in dimensioning the same restrictions as the circulation pump 18. The pressurized cleaning fluid injected from the cleaning device 17 on the surface of the screen cylinder 16b and cleans this. Subsequently, the cleaning liquid enters the pumping pot 15 and is circulated from there by the circulation pump 18 via the water distributor 21 into the storage device 22.

In particular, the auxiliary pump 20 generates a smaller volume flow than the circulating pump 18. As a result, all the cleaning liquid reaching the sump 15 is immediately pumped out of the sump 15 and during the cleaning mode there is no liquid column in the screen cylinder 16b. Thus, if the cleaning device 17 is disposed within the screen cylinder 16b, unbroken the cleaning liquid on the inner circumferential surface of the screen cylinder 16b. If the cleaning device 17 is arranged outside the screen cylinder 16b, the dirt particles released from the cleaning liquid impinging on the outer surface of the screen cylinder 16b are not hindered from escaping from the screen cylinder 16b by a liquid column in the screen cylinder 16b.

In the present embodiment, the storage device 22 is a float storage, and the cleaning liquid is formed from the rinsing liquid.

According to the present embodiment, the cleaning liquid is acted upon by the auxiliary pump 20 at a high pressure. Since the auxiliary pump 20 generates a smaller volume flow than the circulating pump 18, there is essentially no liquid column in the screen cylinder 16b. In this way, an effective cleaning of the screen cylinder 16b of the filter device 16 is realized. In this case, only a small amount of water consumption, since used as a cleaning liquid in circulation rinsing liquid is used. 4 shows a schematic functional representation of a second exemplary embodiment of hydraulic arrangements 31, 32 of the dishwasher 1. FIG. 5 shows a schematic view of an exemplary embodiment of a storage device 22. The second exemplary embodiment will be described below with reference to FIGS. 4 and 5 described in more detail. Functionally identical elements of the second embodiment bear the same reference numerals as the corresponding elements of the first embodiment and will not be described again.

The second embodiment shown in FIG. 4 differs from the first exemplary embodiment in that the second hydraulic arrangement 32 is not closed to a circuit. The pump pot 15 is connected to the drain pump 19 according to the second embodiment, which cleaning liquid from the sump 15 into the waste water, i. in a sewer line, promotes and thereby generates a larger volume flow than the auxiliary pump 20. Thus, even in the second embodiment during the cleaning mode no liquid column in the screen cylinder 16b and / or in the pump pot 15th

The storage device 22 shown in FIG. 5 is a fleet storage device which is provided with an inlet 23, an outlet 24, a fresh water connection 25 and an automatic dosing device 26. The inlet 23 is fluidically connected to the water switch 21 of FIG. 4. The outlet 25 is fluidically connected to the auxiliary pump 20 of the second hydraulic arrangement 31 from FIG. 4. The outlet 25 can also be connected via a water diverter, not shown, to a rinsing fluid connection (not shown) of the first hydraulic system 32. The fresh water connection 25 is fluidically connected to a pressure valve, not shown, and configured to fill the storage device 22 with fresh water. The automatic metering device 26 is configured to add chemicals to the liquid in the storage device 22 to enhance its rinsing and / or cleaning action. By using the storage device 22, the cleaning liquid for use in the second hydraulic arrangement 22 can be formed proportionately from the rinsing liquid circulated via the water distributor 21 from the first hydraulic arrangement 31 and proportionately from the fresh water mixed with chemicals. That is, during the Spülmo- or after the rinsing mode before the start of the cleaning mode, rinsing liquid which has been circulated in the rinsing mode in the first hydraulic arrangement 31 can be conveyed via the water diverter 21 into the storage device 22 of the second hydraulic system. During the cleaning mode, spent cleaning liquid is conveyed from the sump pump 19 out of the sump 15 into the wastewater, and the cleaning liquid missing in this way is transferred by supplying fresh water into the storage device 22 via the fresh water connection 25 and adding chemicals to the cleaning liquid in the storage device 22 the metering device 26 replaced.

According to the second embodiment, the cleaning effect of the cleaning liquid can be improved because soiled cleaning liquid is not circulated after cleaning and the cleaning liquid is at least partially formed from fresh water. The other advantages of the second embodiment are analogous to the advantages of the first embodiment. 6 shows a flow chart of an embodiment of a method for operating a dishwasher 1, in particular a domestic dishwasher, as described, for example, with reference to FIGS. 1 to 5.

The method comprises a step 601 for rinsing items to be rinsed in a rinse container 2 by circulating a rinse liquid in a first hydraulic assembly 31 by means of a circulation pump 18 and a step 602 for cleaning a filter device 16 by means of cleaning liquid in a second hydraulic assembly 32 , 32 of the method correspond in particular to the hydraulic arrangements 31, 32 of the dishwasher 1 of FIGS. 1 to 5.

Step 602 comprises in particular the pumping of the cleaning liquid from the storage device 22 to the cleaning device 17 under pressure by means of the auxiliary pump 20, the spraying of at least a portion of the filter device 16 with the cleaning liquid by means of the cleaning device 17 and the pumping of the cleaning liquid out of the sump 16 by means of the pump arrangement, which according to embodiments may comprise the circulation pump 18 and / or the drain pump 19. Although the present invention has been described with reference to embodiments, it is variously modifiable. For example, the cleaning liquid can be circulated alternately or at the same time partially and partially conveyed into the sewage. In particular, in cases where the cleaning liquid is not formed from the rinsing liquor, the storage device 22 may also be any other void having a capacity of preferably at least 2 l, such as a condenser container of a heat pump or a water bag.

Used reference signs:

1 dishwasher

2 rinse tanks

3 door

4 rinsing chamber

S pivot axis

5 floor

6 ceiling

7 rear wall

8.9 side wall

10 washware receptacle

1 1 rail

12 insertion direction

13 Extraction direction

14 spraying device

14a spray arm

14b spray arm

15 pump pot

16 filter device

16a flat filter element

16b screen cylinder

17 cleaning device

18 circulation pump

19 drain pump

20 additional pump

21 water switch

22 storage device

23 inlet

24 outlet

25 fresh water connection

26 dosing device

31 first hydraulic system

32 second hydraulic system Process step Process step

Claims

Dishwasher (1), in particular domestic dishwasher, with a first hydraulic arrangement (31) for rinsing items to be washed in a rinse container (2) by means of a rinsing liquid, wherein the first hydraulic arrangement (31) comprises a spray unit (14) arranged in the rinse container (2) ), a below the washing container (2) arranged pumping pot (15), in the washing compartment (2) and / or the pump pot (15) arranged filter means (16) for filtering the rinsing liquid and a circulating pump (18) which Um rolling the flushing liquid to the spraying device (14), and a second hydraulic arrangement (32) for cleaning the filter device (16) by means of a cleaning liquid, the second hydraulic arrangement (32) comprising the filter device (16), the sump (15), a pump arrangement (18, 19), a storage device (22) for receiving the cleaning liquid, a cleaning device (17) z to spray at least a portion of the filter device

(16) with the cleaning liquid and between the storage device (22) and the cleaning device (17) arranged auxiliary pump (20) for pressurizing the cleaning liquid.

2. Dishwasher according to claim 1, characterized in that the pump arrangement (18, 19) of the second hydraulic arrangement (32) comprises the circulating pump (18), which is further adapted to circulate the cleaning liquid to the storage device (22).

3. Dishwasher according to claim 1 or 2, characterized in that the pump arrangement (18, 19) of the second hydraulic arrangement (32) comprises a drain pump (19) for conveying the cleaning liquid into a sewer.

4. Dishwasher according to one of claims 1 to 3, characterized in that a water diverter (21) between the circulating pump (18), the spray device (14) and the storage device (22) is arranged, wherein an inlet of the water diverter (21) an outlet of the circulation pump (18) is connected first outlet of the water distributor (21) is connected to an inlet of the spray device (14) and a second outlet of the water distributor (21) is connected to an inlet (23) of the storage device (22).

5. Dishwasher according to one of claims 1 to 4, characterized in that the cleaning liquid is at least partially formed from the rinsing liquid.

6. Dishwasher according to one of claims 1 to 5, characterized in that the storage device (22) has a fresh water connection (25) for filling the storage device (22) with fresh water and the cleaning liquid is at least partially formed from fresh water.

7. Dishwasher according to one of claims 1 to 6, characterized in that the storage device (22) has a metering device (26) for adding chemicals to the cleaning liquid in the storage device (22).

8. Dishwasher according to one of claims 1 to 7, characterized in that the filter device (16) comprises a number of sieves.

9. Dishwasher according to claim 8, characterized in that a sieve of the number of sieves of the filter device (16) as a screen cylinder (16b) is formed.

10. Dishwasher according to one of claims 1 to 9, characterized in that a volume flow of the auxiliary pump (20) is smaller than a volume flow of

Pump arrangement (18, 19).

1 1. Dishwasher according to one of claims 1 to 10, characterized in that the additional pump (20) for pressurizing the cleaning liquid with an additional pressure between 0.5 bar and 20 bar is set up.

12. A method for operating a dishwasher (1), in particular a household dishwasher, comprising:

Purging (601) of items to be washed received in a rinse container (2) by circulating a rinsing liquid in a first hydraulic arrangement (31) which has a spray unit arranged in the rinse container (2)

(14), a pumping pot (15) arranged below the washing container (2), a filter device (16) arranged in the washing container (2) and / or the sump (15) for filtering the washing liquid and a circulating pump (18) the circulation pump (18), and cleaning (602) of the filter device (16) by means of cleaning liquid in a second hydraulic arrangement (32), which the filter device (16), the sump

(15), a pump arrangement (18, 19), a storage device (22) for receiving the cleaning liquid, a cleaning device (17) and between the storage device (22) and the cleaning device (17) arranged auxiliary pump (20), by pumping the cleaning liquid from the storage device (22) to the cleaning device (17) under pressure by means of the auxiliary pump (20), spraying at least a portion of the filter device

(16) with the cleaning liquid by means of the cleaning device (17) and pumping the cleaning liquid from the pump pot (15) by means of the pump assembly (18, 19).