EP2420174A2 - Dishwasher with an improved drainage sequence - Google Patents

Abstract

The dishwasher has a control unit for executing a rinse cycle for cleaning items to be washed on the basis of a selectable rinsing program. A rinsing program is selected, in which an automatic execution of the pump down sequence (A) takes place. The pump down sequence includes three pump down phases (AP-1,AP-2,AP-3). An independent claim is also included for a method for operating a dishwasher, particularly domestic dishwasher.

Description

The present invention relates to a dishwasher, in particular a domestic dishwasher, with a control device for performing a rinse for cleaning items by a selectable wash program and with an adjustable by the controller, in particular controllable or adjustable, drain pump for pumping rinsing liquid from the dishwasher.

Commercially available dishwashers are designed for automatically cleaning dishes with dishwashing liquid. Despite sometimes complex operating procedures, however, it is not always possible to avoid undesirable staining on the cleaned dishes.

The object of the present invention is to provide a dishwasher, in particular a domestic dishwasher, in which an undesirable staining on the cleaned dishes is reduced.

The object is achieved in a dishwasher of the type mentioned in that at least one rinsing program is selected in which at least one automatic pumping sequence takes place, which comprises at least three Abpumpphasen during which the drain pump is turned on, between successive Abpumpphasen the at least three Abpumpphasen is provided in each case a break, during which the drain pump is turned off.

The dishwasher according to the invention has a control device for the automatic control of operating sequences of the dishwasher. For this purpose, the control device can be designed as so-called sequence control, in particular as electronic sequence control.

In the control device, at least one rinse program for performing or controlling a rinsing process, also called rinse cycle, for rinsing items to be washed, in particular for rinsing dishes, deposited. Advantageously, there are several rinsing programs are provided, one of which can be selected and started by the operator. This makes it possible to adjust the course of a wash cycle, in particular to the load, to the type of load, to the degree of soiling of the items to be washed and / or to the desired duration of the wash cycle.

The respectively deposited washing programs can preferably be designed such that the wash cycle controlled in each case by the wash program has several partial wash cycles, in particular at least one pre-wash cycle for pre-cleaning wash items, at least one wash cycle for thorough cleaning of wash ware, at least one intermediate wash cycle for removing soiled wash liquid from the ware, at least one rinse cycle to avoid stains on the items to be washed and / or to prepare a drying step or drying cycle, and / or at least one drying cycle for drying the items to be washed, in the above-mentioned time sequence. Rinse cycle, cleaning cycle, intermediate rinse cycle and rinse cycle are referred to as water-carrying partial rinses, since during their implementation, the introduced into the rinsing chamber items to be treated with a rinsing liquid. During the drying cycle, a use of rinsing liquid is usually not provided.

The treatment of the items to be washed with rinsing liquid can take place in a substantially complete rinsing chamber, in particular a rinsing container, of the dishwasher. In this case, the flushing chamber may be associated with an inlet valve, which allows to fill flushing liquid in the washing chamber. Furthermore, the rinsing chamber may be associated with a circulating pump for circulating a rinsing liquid, which allows the rinsing liquid filled into the rinsing chamber, for. B. from a collection device for rinsing liquid, and apply via a rinsing chamber associated spray system on the dishes.

A rinsing liquid is understood here to mean, in particular, a liquid which is intended to be applied to the ware in order to clean it and / or to treat it in another way. For example, the rinsing liquid can also be provided for heating the items to be washed, which is possible, for example, during a rinsing step in order to carry out a subsequent drying cycle prepare in which the drying is based at least partially on the fact that the washing liquid adhering to the items to be washed evaporates due to the heat stored in the items to be washed.

The rinsing liquid entering the rinsing chamber via the inlet valve is usually fresh water. Depending on the operating phase of the dishwasher, the rinsing liquid in the rinsing chamber can be enriched with cleaning agents, with cleaning auxiliaries, such as, for example, rinse aid and / or with dirt that has been removed from the items to be washed. But there are also cases conceivable in which already enriched water is filled as flushing liquid via the inlet valve in the washing chamber.

Furthermore, the rinsing chamber is associated with a drain pump for pumping out rinsing liquid. The drain pump makes it possible, no longer needed, especially heavily soiled, located in the washing chamber rinsing liquid z. B. from the collection device for rinsing fluid and z. B. to deliver a building-side installed sanitation.

The drain pump is controlled and / or regulated during the execution of a wash cycle by the control device of the dishwasher, depending on the particular selected wash program. It can be provided in particular that at the end of a water-carrying Teilspülgangs each flushing liquid used is pumped out to fill in the subsequent partial wash a possibly unpolluted or less polluted flushing liquid in the washing chamber and to use for cleaning the dishes.

Usually, the drain pump is designed as a centrifugal pump, in particular as a radial pump, as a semi-radial pump or as an axial pump. A centrifugal pump is a turbomachine in which the respective liquid is conveyed by using the centrifugal force by means of a rotating conveyor element. The design of the drain pump as a centrifugal pump leads, better or different than, for example, in an embodiment as a piston pump to the fact that the function of the drain pump is also ensured when the rinsing liquid to be pumped is heavily contaminated.

If such a drain pump is turned on, the amount of rinsing fluid in the dishwasher initially drops substantially linearly over time as the speed remains constant. When falling below a certain residual amount of rinsing liquid, however, such an amount of air enters the drain pump that the pressure for conveying rinsing liquid collapses and consequently no rinsing liquid is promoted more. In this way, remains in the continuous operation of the drain pump not pumpable residual amount of washing liquid in the dishwasher.

Surprisingly, it has now been shown that by automatically carrying out a pumping sequence, which comprises at least three Abpumpphasen during which the drain pump is turned on, between each successive Abpumpphasen the at least three Abpumpphasen is provided in each case a break during which the drain pump is turned off, a in continuous operation of the drain pump not pumpable residual amount of washing liquid, which is used in the dishwasher, can be significantly reduced, ie Subsets of this residual amount can very well be pumped out by the "stutter pump" sequence according to the invention.

The effect, which leads to the reduction of the non-pumped residual amount of rinsing liquid, is not finally clarified. It has been shown, however, that even at least for a short time, a pressure for conveying rinsing liquid is built up when the circulating pump starts up when the residual quantity of rinsing liquid which can not be pumped down by means of continuous operation of the rinsing pump is not reached. This effect, which plays no role in the first of Abpumpphasen due to the still there large amount of irrigation fluid, but occurs for unknown reasons, not only in the second of Abpumpphasen, but also in the third of Abpumpphasen and optionally in other Abpumpphasen. This is surprising insofar as the amount of rinsing liquid which can additionally be pumped off by the start of the rinsing pump would actually have to be pumped off after the second pumping-off phase. By carrying out more than two Abpumpphasen the effect described can therefore be used several times, so that the not pumped residual amount of rinsing liquid can be particularly reduced. By reducing the non-pumpable residual amount of rinsing liquid, in particular a carryover of dirt and / or cleaning agents from the rinsing liquid used before the pumping sequence into a rinsing liquid used after the pumping sequence can be reduced. As a result, the dirt content and / or the cleaning agent content of the last rinsing liquid used in a rinse can be reduced, which reduces staining on the cleaned items to be washed. The cleaned ware thus receives, especially when it comes to cutlery or glassware, a special shine.

Although by performing a second and a third Abpumpphase already a significant reduction of stains on the cleaned items is possible, so may possibly also a fourth Abpumpphase, a fifth Abpumpphase be performed, etc., which can further reduce staining.

According to an advantageous embodiment of the invention, the first of the Abpumpphasen is provided for pumping of at least 80%, preferably of at least 90%, more preferably of at least 95%, of the total amount of rinsing liquid to be pumped. This makes it possible to effectively reduce the residual amount of washing liquid remaining in the dishwasher by means of the subsequent pumping phases.

According to an expedient development of the invention, the first pumping-down phase of the pumping-down phases is provided for pumping out an amount of flushing liquid which can be pumped off during continuous operation of the drainage pump. In this way, it is possible by means of the subsequent pump-down phases to reduce the residual amount of washing liquid remaining in the dishwasher in a particularly effective manner.

According to an expedient development of the invention, a monitoring device is provided for monitoring a rinsing fluid flow conveyed by the lye pump, wherein a termination of the first pumping down phase of the pumping down phases is provided if the monitoring device detects that the minimum rinse fluid flow has been undershot. If a minimum value for the amount of flushing liquid pumped out per unit of time is reached, that is to say for the conveyed flushing liquid flow, this indicates that the amount of flushing liquid which can be pumped off during continuous operation of the drainage pump is essentially pumped out. If the termination of the first pump-down phase is initiated on the basis of this criterion, then it can be ensured that the amount of flushing liquid that can be pumped off in the first pumping step is at least substantially reached, and that, on the other hand, an unnecessary duration of the first pumping-off phase is avoided.

According to an expedient development of the invention, the drain pump has an electric motor, wherein the monitoring unit is designed to monitor at least one electrical operating parameter of the electric motor. This is based on the finding that electrical operating parameters of electric motors of lye pumps change in a characteristic manner depending on the conveyed rinsing liquid flow. This applies, for example, in a running with a fixed voltage drain pump for their power or power consumption. Thus, for a given speed, the power consumption of an air-sucking lye pump is generally well below the power consumption of a solely rinsing liquid-sucking lye pump. Such a monitoring unit is simple in this case. This is especially true in comparison to monitoring devices which have a special flow meter, such as an impeller counter.

According to an expedient development of the invention, a termination of the first pump-down phase of the pump-down phases is provided if, by means of the monitoring device, no drop below the minimum value for the flushing liquid flow is determined after a predetermined period of time has elapsed. In this way it can be prevented that in the case of a malfunction of the monitoring device, the first Abpumpphase is continued indefinitely.

According to an advantageous development of the invention, a termination of at least one of the pumping phases following the first pumping phase and / or at least one of the pauses is timed. In this way, the intended Abpumpsequenz in a simple manner, in particular without additional sensors, can be realized.

According to an expedient development of the invention, at least one of the pauses has a duration of at least 1 second, preferably of at least 2 seconds, more preferably at least 4 seconds and / or at most 24 seconds, preferably at most 12 seconds, more preferably at most 7 seconds. The specified minimum values for the duration of the pauses are normally sufficient for the rinsing fluid stirred up in the preceding pumping phase to reach a rest position during the respective pause during which at least a short-term pressure build-up is possible due to the start-up of the lye pump. The specified maximums will further ensure that the entire pumping sequence does not take longer than necessary.

According to an expedient development of the invention, at least one of the pumping phases following the first pumping phase has a duration of at least 1 second, preferably at least 2 seconds, more preferably at least 4 seconds, and / or at most 32 seconds, preferably at most 16 seconds, more preferably of at most 8 seconds. At the specified minimum values for the duration of the pumping out phases following the first pumping phase, the amount of flushing fluid which can additionally be pumped off at the start of the drain pump can generally be achieved in each of the subsequent pumping phases. The specified maximums will further ensure that the entire pumping sequence does not take longer than necessary.

According to an advantageous development of the invention, at least one rinsing program for carrying out a rinse cycle can be selected, in which case the pumping sequence is provided at the end of a partial rinse cycle provided as an intermediate rinse cycle. Especially at the end of an intended as intermediate rinse Teilspülgangs a reduction in the non-pumped amount of rinsing liquid leads to a reduction of carryover of detergent and / or dirt in the last rinse a rinse, which is usually the rinsing liquid formed as a rinse cycle Teilspülgangs. As a result, the gloss effect on rinsed dishes can be increased particularly effective.

According to an advantageous development of the invention, at least one rinsing program for carrying out a rinse cycle can be selected, in which case the pumping sequence is provided at the end of a partial rinse cycle intended as a cleaning aisle is. In this way, a carry-over of cleaning agent and / or dirt in an intermediate rinse cycle can generally already be prevented, so that the rinse liquid contains less cleaning agent and / or dirt in this intermediate rinse cycle. As a result, further carryover of cleaning agent and / or dirt into the last rinsing liquid of a rinse cycle can be further minimized and the luster effect on the rinsed items to be rinsed can be increased.

According to an advantageous development of the invention, at least one rinsing program for carrying out a rinse cycle can be selected, in which a short rinsing sequence is provided at the end of a partial rinse cycle intended as a pre-rinse, which comprises less pumping phases than the pumping sequence. At the end of a conventional pre-wash, a larger amount of dirt generally adheres to the items to be washed. Since this is usually replaced in the subsequent cleaning cycle, a possible carryover of dirt by not pumped flushing liquid from the pre-wash in the cleaning process is not significant. Therefore, at the end of a pre-wash cycle without disadvantage can be pumped with a Kurzabpumpsequenz, which speeds up the conduct of the wash cycle.

According to an advantageous development of the invention, at least one rinsing program for carrying out a rinse cycle can be selected, in which a short rinsing sequence is provided at the end of a partial rinse cycle provided as a rinse cycle which comprises less pumping phases than the pumping sequence. At the end of a rinse cycle, the rinse liquid used is substantially free of detergent and / or dirt. Therefore, a carryover of detergent and / or dirt in a later rinse at best to a small extent possible and not disturbing. Therefore, at the end of a rinse cycle can be pumped without a disadvantage with a Kurzabpumpsequenz, which further accelerates the execution of the rinse cycle.

According to an expedient development of the invention, the drain pump comprises a brushless electric motor, preferably a brushless permanent magnet motor. The brushless electric motor can be called in particular as a brushless DC motor, also called a BLDC motor, as a brushless AC motor, also called a BLAC motor, or as a synchronous motor. The rotor of the motor can have at least one permanent magnet, whereas the stator has a plurality of electromagnets. The electromagnets are commutated via a control electronics. In comparison with other possible engine concepts, a defined starting of the engine from standstill can be achieved, so that the pumpable amount of flushing liquid which can be pumped into the pumping phases following the first pumping phase can be maximized.

According to an advantageous embodiment of the invention, a circulation pump for applying washware with rinsing liquid is switched off during the entire duration of the Abpumpsequenz. This prevents that rinsing liquid is distributed during the Abpumpsequenz by the circulation pump in the dishwasher, so that they can not be pumped by means of the drain pump.

Furthermore, the invention also relates to methods for operating a dishwasher, in particular a domestic dishwasher, with a control device for controlling rinses on the basis of a selectable washing program and adjustable by the control device, in particular controllable or adjustable drain pump for pumping rinsing liquid from the dishwasher. In this case, a rinsing program is selected in which at least one Abpumpsequenz is automatically carried out, which comprises at least three Abpumpphasen for the duration of the drain pump is turned on, between each successive Abpumpphasen the at least three Abpumpphasen is provided in each case a break for the duration of the drain pump off becomes.

The method according to the invention makes it possible to reduce the formation of stains on the cleaned dishes.

Other advantageous embodiments and / or developments of the invention are given in the dependent claims.

The above advantageous embodiments and / or developments of the invention and the reproduced in the dependent claims advantageous developments of the invention may be provided individually or in any combination with each other in the dishwasher according to the invention.

Figur 1

ein vorteilhaftes Ausführungsbeispiel einer erfindungsgemäßen Haushaltsgeschirrspülmaschine in einer schematischen Seitenansicht,

Figur 2

eine Blockdarstellung der Haushaltsgeschirrspülmaschine von Figur 1,

Figur 3

eine schematische Darstellung eines Spülgangs im Zeitverlauf für die Haushaltsgeschirrspülmaschine der Figuren 1, 2,

Figur 4

eine schematische Darstellung einer Abpumpsequenz der Geschirrspülmaschine der Figuren 1 und 2, sowie

Figur 5

eine schematische Darstellung einer Kurzabpumpsequenz der Geschirrspülmaschine der Figuren 1 und 2.

The invention and its developments and their advantages are explained in more detail with reference to figures. Show it:

FIG. 1

an advantageous embodiment of a domestic dishwasher according to the invention in a schematic side view,

FIG. 2

a block diagram of the household dishwasher of FIG. 1 .

FIG. 3

a schematic representation of a rinse over time for the domestic dishwasher of FIGS. 1 . 2 .

FIG. 4

a schematic representation of a Abpumpsequenz the dishwasher of FIGS. 1 and 2 , such as

FIG. 5

a schematic representation of a Kurzabpumpsequenz the dishwasher of FIGS. 1 and 2 ,

In the following figures, corresponding parts are provided with the same reference numerals. In this case, only those components of a dishwasher are provided with reference numerals and explained, which are necessary for the understanding of the invention. It goes without saying that the dishwasher according to the invention can comprise further parts and assemblies.

FIG. 1 shows an advantageous embodiment of a household dishwasher according to the invention 1 in a schematic side view. The dishwasher 1 has a control device 2, in which at least one wash program for controlling a wash cycle for washing dishes, in particular dishes, is deposited. Expediently, a plurality of washing programs are stored, so that by selecting a suitable washing program, the sequence of a controlled by the control unit 2 rinse, for example, to the load, to the type of load, to the degree of contamination of the dishes and / or to the desired duration of the wash can be adjusted. The control device 2 is associated with an operating device 3, which allows an operator of the dishwasher 1 to call one of the washing programs and thereby start. Furthermore, the control device 2 is associated with an output device 4, which allows the output of messages to the operator. The output device 4 can be used to output z. As optical messages indicator lights, LEDs, an alphanumeric display and / or a graphical display include. In addition, the output device 4 may additionally or independently of the optical display for the output of acoustic messages comprise a buzzer, a loudspeaker and / or the like.

The dishwasher 1 further comprises a rinsing container 5, which can be closed by a door 6, so that a closed rinsing chamber 7 is formed for rinsing dishes. If appropriate, the rinsing container 5 can be arranged inside a housing 8 of the dishwasher 1. In built-in dishwashers, the housing 8 is not required and may be omitted altogether at the top. In FIG. 1 the door 6 is shown in its closed position. The door 6 can be brought into an open position by pivoting about an axis arranged perpendicular to the plane of the drawing, in which it is aligned substantially horizontally and allows the introduction or removal of items to be washed. Im in FIG. 1 the embodiment shown, the operating device 3 is arranged in an easy to use manner on an upper portion of the door 6. The output device 4 is also arranged on the upper portion of the door 6, so that optical messages are clearly visible and / or audible messages are clearly audible. The control device 2 is also positioned there, so that the required signal connections between the operating device 3, the output device 4 and the control device 2 can be kept short. In principle, however, it is possible to arrange the operating device 3, the output device 4 and / or the control device 2 elsewhere. In particular, according to an alternative embodiment variant, the control device may possibly also be accommodated in a base module below the washing compartment. The control device 2 could also be designed decentralized, which is understood to include spatially separated components, which are connected via communication means such that they can cooperate.

The dishwasher 1 has for positioning items to be washed or dishes, an upper dish rack 9 and a lower dish rack 10. The upper dish rack 9 is arranged on extension rails 11, which are each attached to opposite, extending in the depth direction of the washing compartment side walls of the washing compartment 5. When the door 6 is open, the dish rack 9 can be moved out of the washing container 5 by means of the extension rails 11, which facilitates the loading and unloading of the upper dish rack 9. The lower dish rack 10 is arranged on extension rails 12 in an analogous manner.

The one or more stored in the control device 2 washing programs can each provide several Teilspülgänge, for example in this time sequence at least one pre-wash, at least one cleaning cycle, at least one intermediate rinse, at least one rinse and / or at least one drying cycle. Here, pre-wash cycle, cleaning cycle, intermediate rinse cycle and rinse cycle are referred to as water-carrying partial rinses, since during their implementation, the items to be washed positioned in the rinsing chamber 7 are treated with a rinsing liquid S. During the drying cycle, a treatment of the items to be washed with rinsing liquid S is generally not provided.

As a rinsing liquid S for the treatment of the items to be washed, in the present exemplary embodiment, fresh water or feed water ZW is used, which can be taken up by an external water supply device WH, in particular a drinking water supply network, and filled into the rinsing chamber 7 of the rinsing container 5. Typically, a rinsing liquid S formed from fresh feed water ZW is introduced at the beginning of each water-carrying partial rinse cycle, which is then discharged to the end of the respective rinse cycle to an external sanitation AR as wastewater AW. But it is also possible, a rinsing liquid S a Teilspülgangs e.g. Store in a reservoir, not shown, and refill in a later partial rinse cycle in the rinsing chamber 7.

The dishwasher 1 the FIG. 1 comprises a water inlet device 13, which is provided for connection to the external water supply device WH. As in FIG. 1 it can be at the external water supply WH to a faucet WH of a building-side water installation act, the pressurized inlet water ZW provides. The water inlet device 13 comprises a connection piece 14, which is provided for connection to the water tap WH. The connection can be made for example via a threaded arrangement, a bayonet arrangement or the like. Downstream of the connecting piece 14, a connection hose 15 is provided, which is preferably designed to be flexible. The downstream end of the connection tube 15 is connected to a housing-fixed connection piece 16.

Downstream of the housing-fixed connecting piece 16, a supply line 17 is provided, which is connected to an input side of a switchable by means of the control device 2 inlet valve 18. An output side of the inlet valve 18 in turn is connected to a liquid inlet 19 of the rinsing chamber 7. In this way, it is possible, by means of the water inlet device 13, to feed feed water ZW as dishwashing liquid S into the interior of the dishwashing chamber 7 of the dishwasher 1. The inlet valve 18 may be formed as a switchable solenoid valve, which has only an open position and a closed position. In the supply line 17, a water treatment system, not shown, for example, a water softening system may be provided.

Instead of or in addition to the device-side inlet valve 18 may also be provided between the fitting 14 and the faucet WH an external inlet valve, in particular a so-called aqua-stop valve, which is preferably switchable by means of the control device, in particular lockable and open.

Due to its weight force, the rinsing liquid S introduced into the rinsing chamber 7 via a liquid inlet 19 passes into a collecting device 21 which is formed on a base 20 of the rinsing container 5 and which can preferably be designed as a collection pot 21. A circulating pump 22 is connected with its inlet 23 fluid-conducting with the collecting pot 21. Furthermore, in the embodiment, an output side of the circulation pump 22 via a preferably electric heater 24 for heating rinsing liquid S with a spray device 25, 26 is connected, which makes it possible to apply the introduced into the rinsing chamber 7 items with optionally heated rinsing liquid S. In the embodiment of FIG. 1 For example, the sprayer 25, 26 includes an upper rotatable spray arm 25 and a lower rotatable spray arm 26. However, it could Alternatively or additionally, fixed spray elements or other spray devices may be provided.

The flushing liquid S emerging from the spraying device 25, 26 when the circulating pump 22 is switched on is returned to the collecting pot 21 due to its weight within the flushing chamber 21. During the circulating of the flushing liquid S in the flushing chamber 7, the circulating pump 22 is intended to be operated in a concentricity. The circulating pump 22 is then in the concentricity when its inlet 23 is completely filled with flushing liquid S in cross section, so that exclusively flushing liquid S, or in other words, no air enters the interior of the circulation pump 22. By the operation of the circulation pump 22 in the concentricity, on the one hand, sufficient pump pressure for an intended cleaning effect can be achieved and, on the other hand, the formation of disturbing snore or snorkel noise can be avoided. In order to determine whether or not the circulation pump 22 is in concentricity, it is assigned a concentricity monitoring unit 27. This can be provided as a separate component or possibly also be part of the control device 2. If, during the circulation of rinsing liquid by means of the concentricity monitoring unit 27, a non-circular run of the circulating pump 22 is detected, then additional rinsing liquid S can be introduced into the collecting device 21 by opening the inlet valve 18, so that the level of rinsing liquid S in the collecting device 21 increases the circulation pump 22 thereby passes into the concentricity.

Furthermore, the dishwasher 1 in a conventional manner to a metering device 28, which makes it possible to put the rinsing liquid S introduced into the rinsing chamber 7 with cleaning agents in powder form and / or liquid form to improve the cleaning effect of a rinse cycle. A further metering device 29 also makes it possible to provide the rinsing liquid S with, in particular, liquid rinse aid, in order in particular to avoid staining on the cleaned items to be washed and to increase a drying effect of a rinse cycle.

Furthermore, in the FIG. 1 Dishwasher 1 shown on a drain device 30, which serves to pump out no longer required rinsing liquid S as wastewater AW from the washing chamber 7 to the outside. The drainage device 30 includes a drain pump 31, the inlet 32 is connected to the collecting pot 21. The outlet side of the drain pump 31, however, is connected via a non-return valve 33 to a connecting line 34, the downstream end of which is connected to a housing-fixed connection 35 of the dishwasher 1. To an output of the housing-fixed terminal 35, a waste water hose 36 is attached, which is flexible. At the downstream end of the sewage hose 36, a fitting 37 is arranged, which is intended to connect the drainage device 30 with a sanitation AR. The sanitation device AR can be a sewer pipe AR of a building-side water installation. The connection between the connecting piece 36 and the sewage pipe AR can be designed as a screw connection, as a bayonet connection, as a plug connection or the like.

In this way it is possible, no longer required rinsing liquid S, in particular polluted rinsing liquid S, to be discharged from the collecting device 21 to the sanitation AR, which is prevented by the non-return valve 33, which may be formed as a check valve 33, for example, already from Collecting device 21 pumped out flushing liquid S and / or from the sanitation AR originating liquid passes through their weight and / or by pressure fluctuations in the sanitation AR into the collection device 21.

The drain pump 31 is preferably a monitoring device 38 for monitoring a per unit time promoted amount of flushing fluid S, ie for monitoring the funded Spülflüssigkeitsstroms assigned. The monitoring device 38 makes it possible to detect, for example, when the level of flushing liquid S in the collecting device 21 has dropped so far during the pumping of rinsing liquid S from the collecting device 21 that no rinsing liquid S is conveyed any longer.

In the exemplary embodiment, the drain pump 31 has an electric motor, wherein the monitoring unit 38 is designed in particular for monitoring at least one electrical operating parameter of the electric motor. This is based on the finding that electrical operating parameters of electric motors of lye pumps 31 in dependence on the promoted Spülflüssigkeitsstrom change characteristically. This applies, for example, in a running with a fixed voltage drain pump for their power or power consumption. Thus, for a given speed, the power consumption of an air-sucking lye pump is generally well below the power consumption of a solely rinsing liquid-sucking lye pump 31. Such a monitoring unit 38 is of simple construction. This is especially true in comparison to monitoring devices which have a special flow meter, such as an impeller counter.

The electric motor of the drain pump 31 may in particular be a brushless electric motor, preferably a brushless permanent magnet motor. The brushless electric motor can be called in particular as a brushless DC motor, also called a BLDC motor, as a brushless AC motor, also called a BLAC motor, or as a synchronous motor. The rotor of the motor can have at least one permanent magnet, whereas the stator has a plurality of electromagnets. The electromagnets are commutated via a control electronics. In comparison with other possible engine concepts, a defined starting of the engine from standstill can be achieved, so that the pumpable amount of flushing liquid which can be pumped into the pumping phases following the first pumping phase can be maximized.

Furthermore, the dishwasher 1 comprises the FIG. 1 a Sorptionstrockenvorrichtung 39 shown only schematically, which makes it possible to guide air in a circuit via a sorption column, not shown, via an opening 40 in the rinsing chamber 7 and to take over a further opening 41 from the rinsing chamber 7 to re-them on the Lead sorption. In the process, moisture in the air settles on the sorption column, so that the air is dehumidified. When dehumidifying, the air is also heated, so that the introduced into the rinsing chamber 7 air is dry and warm. The sorption drying device 39 is in particular provided to dry the items to be washed in a drying sequence by means of the dried and heated air during a drying cycle of a rinse cycle. In order to remove the moisture accumulated on the sorption column, the sorption column is provided with a heater, not shown, by means of which the sorption column during a regeneration sequence is heated so that the moisture dissolves again from the sorption column. The regeneration sequence can be carried out in particular during a cleaning cycle of a rinse cycle, in which case the waste heat of the regeneration sequence for heating a rinsing liquid of the cleaning cycle can be used, which lowers the energy requirement of the heating device 24 associated with the circulation pump 22.

FIG. 2 shows a block diagram of the household dishwasher 1 of FIG. 1 , where in particular their control and communication concept is shown there. In the exemplary embodiment, a signal line 42 is provided, which connects the operating device 3 to the control device 2 such that operating commands of an operator can be transmitted from the operating device 3 to the control device 2. Furthermore, a signal line 43 is provided, which connects the control device 2 to the output device 4, so that information provided by the control device 2 can be transmitted to the output device 4 and output there to the operator.

Furthermore, a control line 44 is provided, which connects the control device 2 with the switchable inlet valve 18 such that the inlet valve 18 can be closed or opened by the control device 2. In this way, the filling of rinsing liquid S in the rinsing chamber 7 can be controlled by the control device 2. A further control line 45 connects the control device 2 with the circulation pump 22. As a result, the circulation of rinsing liquid S in the rinsing chamber 7 by the control device 2 is adjustable, in particular controllable or adjustable.

Furthermore, a signal line 46 is provided, which connects the concentricity monitoring unit 27 with the control device 2. The signal line 46 makes it possible to transmit information generated by the concentricity monitoring unit 27 with respect to the running properties of the circulation pump 22 to the control device 2. In this case, the control device 2 is designed so that it can take into account this information from the concentricity monitoring unit 27 in the circuit, in particular in the control of the closing and / or opening times, possibly also control or regulation of the inlet valve 18. The concentricity monitoring unit 27 may be formed in particular as a functional component of the control device 2.

Further, a control line 47 is provided, which connects the control device 2 with the drain pump 31, so that the drain pump 31 by the control device 2 switchable, in particular off and on, optionally also controllable or adjustable, is. A further signal line 48 connects the monitoring device 38 associated with the drain pump 31 with the control device 2 in such a way that information generated by the monitoring device 38 can be taken into account by the control device 2 during the execution of rinse cycles.

Another control line 49 connects in the embodiment, the control device 2 with the circulating pump 22 associated heating device 24 such that the heater 24 can be used in the course of a rinse cycle by the control device 2 as needed.

Via a further control line 50, which connects the control device 2 and the sorption drying device 39, it is also possible for the control device 2 to control and / or regulate the operation of the sorption drying device 39.

The addition of cleaning agent to a rinsing liquid can also be influenced by the control device 2 via a further control line 51 which connects the control device 2 and the dosing device 28.

Likewise, the addition of cleaning agent to a rinsing liquid can be influenced by the control device 2 via a further control line 52 which connects the control device 2 and the dosing device 29.

FIG. 3 shows an exemplary rinse SG of the dishwasher 1 according to the invention, which causes a special gloss effect on cleaned ware by a lower carryover of dirt and / or detergent in the last used rinse liquid S. The rinse cycle SG comprises a plurality of partial rinses, namely a pre-rinsing cycle VG for pre-cleaning items to be washed, a cleaning cycle RG for thorough cleaning of items to be washed, an intermediate rinse ZG for removing soiled rinsing liquid in the following time sequence S of the items to be washed, a rinse KG to avoid stains on the items to be washed and a drying cycle TG for drying the items to be washed. In principle, however, it would be possible to dispense with some of the mentioned partial rinses, for example the pre-rinse cycle VG. Likewise, additional partial rinses, for example a second intermediate rinse cycle, could be provided.

At the beginning of the pre-wash cycle VG, a filling sequence F ₁ for filling the rinsing chamber 7 with rinsing liquid S is carried out. In this case, the filling valve 18 is temporarily opened in the embodiment. Likewise, at the beginning of the pre-wash cycle VG a Umwälzsequenz U _{1 is} carried out, in which the items to be washed with circulated flushing liquid S is applied. For this purpose, the circulating pump 31 is switched on at least temporarily during the circulation sequence U ₁ . After Umwälzsequenz U ₁ described below in detail Kurzabpumpsequenz KA _{1 is} performed while the at least a substantial part of the now located in the washing chamber 7 and now contaminated rinsing liquid S is discharged by means of the drain pump 31, for example, to the sewer pipe AR. Carrying out the short pumping sequence KA ₁ at the end of the pre-wash cycle VG can accelerate the execution of the rinse cycle, although an increased carryover of dirt into the subsequent cleaning cycle RG is possible by means of non-pumped rinse liquid. However, this presents no major problems, since at the end of the pre-wash VG generally still a larger amount of dirt adheres to items to be washed, which is usually replaced in the subsequent cleaning cycle RG and the used there flushing fluid S, so that a possible carryover of dirt by Unwashed rinsing liquid from the pre-rinse cycle in the cleaning cycle is not significant.

For the now performed cleaning cycle RG further flushing liquid S is introduced into the rinsing chamber 7 by means of a further filling sequence F ₂ and circulated in a further circulation sequence U ₂ . In this case, the cleaning effect of the cleaning cycle is increased by a heating of the rinsing liquid S, for example by means of the heater 24 and / or by means of the waste heat of a regeneration phase of the Sorptionstrockenvorrichtung 39 takes place in a heating phase H ₂ . For the same purpose, an addition ZR of cleaning agent takes place in the cleaning cycle RG, for example via the metering device 28. In this way, in the cleaning cycle RG, the dirt adhering to the items to be washed can be almost completely removed. In order to pump the heavily soiled rinsing liquid S of the cleaning cycle RG, an exhaust pumping sequence A ₂ , which is also described in more detail below, is carried out at its end, which is characterized in that a non-pumpable residual amount of rinsing liquid S is reduced compared to the short pumping sequence KA ₁ . In this way, carryover of dirt and / or cleaning agent into the intermediate rinse ZG carried out subsequently is reduced.

The intermediate rinse ZG comprises a further filling sequence F ₃ for filling the rinsing chamber 7 with rinsing liquid S and a further circulating sequence U ₃ , which essentially serves for rinsing off residues of the rinsing liquid S of the rinsing RG from the items to be washed. In this case, the interfering residues can be removed particularly well, since a particularly clean rinsing liquid is available due to the almost complete pumping out of the rinsing liquid S of the cleaning cycle R in the intermediate rinse cycle ZG. The rinsing liquid S of the intermediate rinse ZG also takes on only little dirt and / or detergent during the intermediate rinse, so that the rinsing liquid S at the end of the intermediate rinse ZG is much cleaner than would be the case if carried out at the end of the cleaning cycle RG a Kurzabpumpsequenz would have been. At the end of the intermediate rinse cycle ZG, an exhaust pumping sequence KA ₃ is now carried out, which is likewise distinguished by the fact that a non-pumpable residual quantity of rinsing liquid S is reduced compared to the short pumping sequence KA ₁ . As a result, carry-over of dirt and / or cleaning agent into the rinse cycle KG is further reduced from the already relatively clean rinsing liquid S of the intermediate rinse Z.

In the rinse cycle KG, rinsing liquid S filled by means of a further filling sequence F _{3 is} circulated in a circulating sequence U ₄ . The addition ZK of rinse aid, for example via the metering device 29, is provided in order to reduce the surface tension of the rinsing liquid S. As a result, the rinsing liquid S runs better from the items to be washed, which serves in a known manner to avoid stains on items to be washed.

In particular, it is advantageous that by carrying out the special pumping sequences A ₂ and A _3, the last rinsing liquid S of the rinse SG, in the embodiment the rinsing liquid of the rinse cycle KG, contains much less dirt and / or detergent, so that the staining on the cleaned items to be further reduced.

The rinsing liquid of the rinse cycle KG can easily be carried out by means of a further short pumping sequence KA ₄ , since due to its low content of dirt and / or cleaning agent a substantial carryover of dirt and / or detergent into a subsequent rinse SG is generally not possible.

In the final drying cycle TG, the items to be washed are dried in the exemplary embodiment by means of dry-warm air of the sorption drying apparatus 39 during a drying sequence T ₅ . But it is also possible to dry the items without Sorptionsstrockenvorrichtung 39, in particular by a so-called self-drying, wherein the drying is at least partially based on the fact that the washing liquid adhering to the washware S evaporates due to the heat stored in the ware. In order to bring the items to be washed to the temperature required for this purpose, during the rinse cycle KG, the rinsing liquid S used there could be heated by means of a heating phase not provided in the exemplary embodiment.

During the entire duration of the pumpdown sequences A ₂ and A ₃ and the short pumpdown sequences KA ₁ and KA ₄ , the circulation pump 22 is switched off in each case. This prevents that rinsing liquid S is distributed during the Abpumpsequenzen A ₂ and A ₃ and the Kurzabpumpsequenzen KA ₁ and KA ₄ by the circulation pump 22 in the dishwasher 1, so that they can not be pumped by the drain pump 31.

FIG. 4 shows a schematic representation of an Abpumpsequenz A of the dishwasher according to the invention the FIGS. 1 and 2 which the in FIG. 3 shown Abpumpsequenzen A ₂ and A ₃ corresponds. In this case, in an upper part of the diagram, the amount M in% of the amount of flushing liquid S still present in the flushing chamber 7 is shown in relation to the amount at the beginning of the pumping sequence A over time t. This amount M can also be referred to as the relative amount M.

In a lower part of the diagram, the operating state Z31 of the drain pump 31 is shown. In this case, the operating state "1" means that the drain pump 31 is switched on, and the operating state "0" means that the drain pump 31 is switched off.

The Abpumpsequenz A comprises three Abpumpphasen AP ₁ , AP ₂ and AP ₃ , during which the drain pump 31 is turned on continuously. Furthermore, pauses P ₁ , and P _{2 are} provided, during which the circulation pump 31 is switched off continuously. The pumping-down phase AP ₁ is separated from its neighboring pumping-down phase AP ₂ by a break P _1, and this in turn is separated from its neighboring pumping-down phase AP ₃ by a pause P ₂ .

The drain pump 31 may in particular be designed as an electric centrifugal pump, for example as a radial pump, as a semi-radial pump or as an axial pump. The design of the drain pump 31 as a centrifugal pump, better or different than, for example, in an embodiment as a piston pump, to ensure that the function of the drain pump is also ensured when the rinsing liquid to be pumped is heavily contaminated.

If the lye pump 31 designed as a centrifugal pump is then switched on at the beginning of the first pumping-down phase AP ₁ , the relative amount M of the rinsing fluid S in the dishwasher ₁ initially drops substantially linearly over time as the rpm of the lye pump 31 remains constant. When falling below a certain residual amount RMD of rinsing liquid S at time T1, however, such an amount of air enters the circulation pump 31, so that the pressure for conveying rinsing liquid S collapses and consequently no rinsing liquid S is more promoted. This state can be determined by means of the monitoring device 38, for example, based on a monitoring of an electrical parameter of the drain pump 31, wherein then the first pumping AP ₁ can be stopped.

In this way, remains in the dishwasher at the end of the first Abpumpphase a non-pumpable in continuous operation of the drain pump 31 residual amount RMD of flushing liquid S. On the other hand, this ensures that during the first pumping AP ₁ in continuous operation of the circulation pump 31st pumpable amount of AMD flushing liquid S is actually pumped out. In this way it is possible, by means of the subsequent pumping phases AP ₂ , AP _3, to reduce particularly effectively the residual quantity RM of flushing liquid S remaining in the dishwasher 1.

Optionally, it can be provided that the first pumping phase AP ₁ is ended when, by means of the monitoring device 38, the minimum value for the flushing liquid flow has not been determined after a predetermined period of time has elapsed. In this way it can be prevented that in the event of a malfunction of the monitoring device 38, the first pumping phase AP _{1 is} continued indefinitely.

After a pause or dead time period P1, during which the drain pump 31 is switched off, the relative amount M of flushing fluid during the subsequent, second pump-down phase AP ₂ continues to decrease when the drain pump 31 is switched on. The effect which leads to the reduction of the relative amount M of rinsing liquid S is not conclusively clarified. However, it has been shown that at the start of the circulation pump 31 after the break P ₁ at least for a short time, a pressure for conveying rinsing liquid S is established, even though the non-pumpable by means of continuous operation of the drain pump 31 residual amount RMD is below rinse liquid S.

Surprisingly, this effect also occurs after the second pause P ₂ during the third pumping-down phase AP ₃ , so that the relative amount M continues to decrease. As a result, a residual amount RM of flushing liquid S, which is not pumpable with the pumping sequence A and which is applied at the end of the pumping sequence A in the dishwasher 1, can be significantly reduced. By carrying out at least three pumping phases AP ₁ , AP ₂ and AP ₃ , the described effect can therefore be used several times, so that the residual amount RM of flushing liquid not pumped off at the end of the pumping sequence A can be particularly greatly reduced. Therefore, further, not shown, separated by pauses Abpumpphasen could be provided to further reduce the not pumpable with the Abpumpsequenz A residual amount RM of rinsing liquid.

The pauses P ₁ and P ₂ can have a duration of at least 1 second, preferably at least 2 seconds, more preferably of at least 4 seconds and / or a maximum of 24 seconds, preferably not exceeding 12 seconds, more preferably of at most 7 seconds exhibit. The specified minimum values for the duration of the pauses P ₁ and P ₂ are normally sufficient for the rinsing liquid S whirled up in the respective preceding pumping phase AP ₁ or AP _{2 to be} in the drain pump 31 during the respective pause P ₁ or P ₂ in FIG reaches a rest position, in which by the start of the drain pump 31 at least a short-term pressure build-up is possible. The specified maximums will further ensure that the entire pump-out sequence A does not take longer than necessary.

The pumping phases AP ₂ and AP ₃ following the first pumping phase AP ₁ preferably have a duration of at least 1 second, preferably of at least 2 seconds, particularly preferably of at least 4 seconds, and / or of at most 32 seconds, preferably of at most 16 seconds, more preferably of at most 8 seconds. At the specified minimum values for the duration of the pumping phases AP ₂ and AP ₃ following the first pumping phase AP ₁ , the maximum amount of flushing liquid S that can be pumped out at the start of the drain pump 31 can be achieved in each of the subsequent pumping phases AP ₂ and AP ₃ . The specified maximums will further ensure that the entire pump-out sequence A does not take longer than necessary.

By reducing the residual amount RM of washing liquid S which can not be pumped down by means of the pumping sequence A, it is possible in particular to reduce carryover of dirt and / or cleaning agents from the washing liquid S used before the pumping sequence A into a washing liquid S used after the pumping sequence A. As a result, the dirt content and / or the cleaning agent content, in particular of the last rinsing fluid S used in a rinse SG, can be reduced, which reduces staining on the cleaned items to be washed. The cleaned ware thus receives, especially when it comes to glassware, a special shine.

FIG. 5 shows a schematic representation of a Kurzabpumpsequenz KA of the dishwasher 1 of the invention FIGS. 1 and 2 , The short pumping sequence KA essentially differs from the pump-down sequence A in that fewer pump-out phases, for example only one pump-off phase AP _{1, are} provided. This results in the passage of time a changed relative amount M 'of rinsing liquid in the rinsing chamber 7, wherein the existing at the end of the Kurzabpumpsequenz KA amount RM' is greater than that at the end of Abpumpsequenz A amount RM, which, as already stated, at the end of Pre-wash VG and can be tolerated at the end of the rinse cycle. However, this has the advantage that the time required for the short pumping sequence KA can be significantly reduced compared to the pumping sequence A.

The invention causes cleaned glasses and cutlery are improved spot-free. The effect is preferably achieved by combining a drying process with a sorption system, for example with a zeolite system, or a conventional drying process with the indicated, special pump-down method, which reduces carry-over of dirt and / or cleaning agents.

In particular, it can be useful for effecting a desired "shine-drying" of the items to be washed, preferably glasses, if in addition at least a second intermediate rinsing is carried out with an inventive pump-off sequence after the first intermediate rinsing and the subsequent rinsing.

LIST OF REFERENCE NUMBERS

1

dishwasher

2

control device

3

operating device

4

output device

5

rinse tank

6

door

7

rinsing chamber

8th

casing

9

upper dish rack

10

lower crockery basket

11

out rail

12

out rail

13

Water inlet device

14

connector

15

connecting hose

16

fixed housing

17

Supply, supply line

18

inlet valve

19

liquid inlet

20

Bottom of the washing container

21

Collection device, collection pot

22

circulating pump

23

Inlet of the circulation pump

24

heater

25

upper spray arm

26

lower spray arm

27

Concentricity monitoring unit of the circulation pump

28

Dosing device for cleaning agents

29

Dosing device for rinse aid

30

outflow device

31

Drain pump

32

Inlet of the drain pump

33

check preventer

34

connecting line

35

fixed housing

36

drain hose

37

connector

38

Monitoring device for rinsing liquid flow

39

sorption

40

Opening for entry of air into the washing compartment

41

Opening for the escape of air from the washing compartment

42

signal line

43

signal line

44

control line

45

control line

46

signal line

47

control line

48

signal line

49

control line

50

control line

51

control line

52

control line

WH

Water supply device, faucet

ZW

water supply

S

rinse

AR

Sanitation facility, sewer pipe

AW

sewage

SG

rinse

VG

prewash

RG

intermediate rinsing

ZG

intermediate rinsing

KG

rinse cycle

TG

drying cycle

F

stuffer

U

Umwälzsequenz

A

Abpumpsequenz

KA

Kurzabpumpsequenz

H

heating phase

T

drying sequence

ZR

Addition of detergent

ZK

Addition of rinse aid

AP

Expression Phase

P

Break

Z31

Operating status of the drain pump

M

relative amount of rinsing liquid in the rinsing chamber

AMD

in the continuous operation of the drain pump pumpable amount of flushing liquid

RMD

in continuous operation not pumpable residual amount of rinsing liquid

RM

Remaining amount of rinsing liquid at the end of the pumping sequence

Claims (15)

Dishwasher (1), in particular domestic dishwasher, with a control device (2) for carrying out a wash cycle (SG) for cleaning items to be washed by means of a selectable wash program and with a wash pump (31) which can be adjusted, in particular controlled or regulated by the control device (2) for pumping out rinsing liquid (S) from the dishwasher (1), characterized in that at least one rinsing program can be selected in which at least one automatic carrying out of a pumping sequence (A, A ₂ , A ₃ ) takes place, which comprises at least three pumping phases (AP ₁ , AP ₂ , AP ₃ ), during which the drain pump (31) is in each case switched on, wherein between successive pumping phases (AP ₁ , AP ₂ , AP ₃ ) of the at least three pumping phases (AP ₁ , AP ₂ , AP ₃ ) one each Pause (P ₁ , P ₂ ) is provided, during which the drain pump (31) is turned off. Dishwasher according to the preceding claim, characterized in that the first Abpumpphase (AP ₁ ) of Abpumpphasen (AP ₁ , AP ₂ , AP ₃ ) is provided for pumping out a pumpable in continuous operation of the drain pump amount (AMD) of washing liquid. Dishwasher according to one of the preceding claims, characterized in that a monitoring device (38) for monitoring a of the drain pump (31) promoted Spülflüssigkeitsstroms is provided, wherein a termination of the first Abpumpphase (AP ₁ ) of Abpumpphasen (AP ₁ , AP ₂ , AP ₃ ) is provided when by means of the monitoring device (38) falls below a minimum value for the Spülflüssigkeitsstrom is detected. Dishwasher according to claim 3, characterized in that the drain pump (31) comprises an electric motor, wherein the monitoring device (38) is designed for monitoring at least one electrical operating parameter of the electric motor. Dishwasher according to claim 3 or 4, characterized in that a discontinuation of the first Abpumpphase (AP ₁ ) of Abpumpphasen (AP ₁ , AP ₂ , AP ₃ ) is provided if by means of the monitoring device (38) after expiry of a predetermined time no falling below the Minimum value for the flushing liquid flow is detected. Dishwasher according to one of the preceding claims, characterized in that a termination of at least one of the first pumping phase (AP ₁ ) following Abpumpphasen (AP ₂ , AP ₃ ) and / or at least one of the pauses (P ₁ , P ₂ ) is time-controlled. Dishwasher according to one of the preceding claims, characterized in that at least one of the pauses (P ₁ , P ₂ ) has a duration of at least 1 second, preferably at least 2 seconds, more preferably at least 4 seconds, and / or at most 24 seconds, preferably of at most 12 seconds, more preferably of at most 7 seconds. Dishwasher according to one of the preceding claims, characterized in that at least one of the following pumping phases following the pumping phase (AP ₂ , AP ₃ ) has a duration of at least 1 second, preferably of at least 2 seconds, more preferably of at least 4 seconds, and / or of not more than 32 seconds, preferably not more than 16 seconds, more preferably not more than 8 seconds. Dishwasher according to one of the preceding claims, characterized in that at least one washing program for performing a wash cycle (SG) is selectable, in which the Abpumpsequenz (A ₃ ) is provided at the end of an intermediate rinse (ZG) Teilspülgangs. Dishwasher according to one of the preceding claims, characterized in that at least one washing program for performing a wash cycle (SG) can be selected, in which the Abpumpsequenz (A ₂ ) is provided at the end of a cleaning cycle (RG) Teilspülgangs. Dishwasher according to one of the preceding claims, characterized in that at least one rinsing program for performing a rinse cycle (SG) is selectable, in which at the end of a pre-rinse (VG) Teilspülgangs a Kurzabpumpsequenz (KA ₁ ) is provided which less Abpumpphasen (AP ₁ ) as the pumping sequence (A, A ₂ , A ₃ ). Dishwasher according to one of the preceding claims, characterized in that at least one rinsing program for performing a rinse cycle (SG) is selectable, in which at the end of a rinse (KG) Teilspülgangs a Kurzabpumpsequenz (KA ₄ ) is provided which less Abpumpphasen (AP ₁ ) as the pumping sequence (A, A ₂ , A ₃ ). Dishwasher according to one of the preceding claims, characterized in that the drain pump (31) comprises a brushless electric motor, preferably a brushless permanent magnet motor. Dishwasher according to one of the preceding claims, characterized in that a circulation pump (22) is switched off for loading ware with rinsing liquid (S) during the entire duration of the pumping sequence (A, A ₂ , A ₃ ). Method for operating a dishwasher, in particular a domestic dishwasher, with a control device (2) for controlling rinsing cycles (SG) on the basis of a selectable washing program and with a by the control device (2) adjustable, in particular controllable or controllable, drain pump (31) for pumping off Rinsing liquid from the dishwasher (1), in particular according to one of the preceding claims, characterized in that a rinsing program is selected in which at least one pumping sequence (A, A ₂ , A ₃ ) is automatically carried out, which at least three pumping phases (AP ₁ , AP ₂ , AP ₃ ), for the duration of which the drain pump (31) is in each case switched on, wherein between successive pump-down phases (AP ₁ , AP ₂ , AP ₃ ) of the at least three pump-down phases (AP ₁ , AP ₂ , AP ₃ ) each have a break (P ₁ , P ₂ ) is provided for the duration of the drain pump (31) is turned off.

Images