EP3319501B1 - Dishwasher having a drying device - Google Patents

Description

The invention relates to a dishwasher, in particular a domestic dishwasher, with a rinsing container for cleaning dishes, glasses, cutlery or similar items to be washed and with a phase-absorbing agent of a sorption drying device, in particular based on zeolite, with heated and water-containing during at least one desorption phase of the water-absorbing agent Air can be introduced into the washing compartment via at least one blow-out opening, according to the preamble of claim 1.

Different phases are possible in sorption drying devices with a water-absorbing agent or reversibly dehydrable sorption material, such as, for example, zeolite. During an adsorption phase, water-containing air is passed out of the washing compartment through the sorption drying device. The sorption material absorbs water from the air flowing through and / or water adheres to the sorption material so that the items to be washed can be dried in the washing container. In a desorption phase, this water is released again by the sorption material while the reversibly dehydratable sorbent is heated (by means of a heater) and blown out into the rinsing container. Such a desorption phase can take place, for example, before the actual drying cycle of the dishwashing cycle of a dishwashing program and has the advantage that residues of detergent, in particular rinse aid, remaining on the wash ware are diluted by the water vapor which is formed, and so staining is reduced. However, it is disadvantageous that very high temperatures occur at the blow-out opening, for example above 200 ° C. As a result, items to be washed can be damaged in the vicinity of the blow-out opening, particularly if this is made of plastic. The same applies to that part of a crockery basket or another accommodation unit, such as a cutlery basket, which accommodates items to be washed and which is in the vicinity of the blow-out opening. In addition, one or more wall surfaces of the washing compartment can become so hot, if necessary, that air flows from the blow-out opening so that touching them can be uncomfortable for an operator if the operator opens the door of the dishwasher during a desorption phase and into the washing compartment with one hand such a strongly heated wall part reaches. In the worst case, there may even be a risk of burns or scalding for an operator, for example if the operator opens the door, thereby interrupting the washing cycle during a desorption phase, and the person reaches into the washing container and with too much heated items, too much heated parts a crockery basket and / or an excessively heated wall surface of the washing container comes into contact. Cooling of the blow-out opening is therefore sought.

Eg in the dishwasher of the DE 10 2008 043 554 A1 or the WO 2010/023072 A1 In the desorption phase, heated air is passed through the sorption drying device by means of a blower, and the hot water-containing air thus formed is blown into the rinsing container through a blow-out opening. The blow-out opening is cooled during the desorption phase in that a cap covering the blow-out opening is sprayed with water from a rotatingly operated spray arm during its rotational movement. In order to convey water to the spray arm and thereby set the spray arm in rotation, a correspondingly high speed of rotation of the circulation pump of the dishwasher is required, which results in a high noise level of the dishwasher.

The invention is based on the problem of achieving an improvement here.

The invention solves this problem by a dishwasher with the features of claim 1. Further advantages and design features as well as further developments of the invention are specified in claims 2 to 15, the features of which can be implemented individually or in combination with one another.

Because the blow-out opening can be cooled according to claim 1 by means of a specially provided, separate, and directed towards this coolant, it is not necessary that the blow-out opening is cooled by a spray device in the washing container, in particular a rotating spray arm, which is used for spraying Washware is provided in the wash container. The spraying of liquid onto the items to be washed by the spraying device can thus advantageously be restricted or reduced or avoided entirely. The pumping capacity of a pump, in particular a circulating pump, which is provided for conveying washing liquid or rinsing liquor to one or more spray devices arranged in the rinsing container, can do this be at least significantly reduced during the respective desorption phase, so that the pump noise of the pump is reduced accordingly and thus the operating noise of the dishwasher as a whole is reduced. The pump output can preferably be reduced by reducing the speed of the pump.

By cooling the blow-out opening, the outlet temperature of the air which flows out of the blow-out opening is reduced compared to the desorption temperature of the air which it originally had in the respective desorption phase after flowing through the sorption unit of the sorption drying device which has the reversibly dehydratable sorption material. Desorbing the reversibly dehydratable sorption material is expediently brought about by heating it by means of an electrical heater assigned to the sorption unit and flowing air through it or by flowing hot air which (viewed in the direction of air flow) has previously been heated by means of an electrical heater. The air that leaves the sorption unit during a desorption phase has, in particular, a desorption temperature between 200 ° C. and 350 ° C. and would flow out of the outlet opening into the interior of the rinsing container without cooling at an outlet temperature of more than 100 ° C. In contrast, the air leaving the blow-out opening and entering the rinsing container now has an outlet temperature, which is preferably less than or equal to 70 ° C., by cooling the blow-out opening by means of the coolant application device according to the invention.

Preferably, at least one feed pipe for coolant, in particular coolant, is additionally, i.e. Provided specifically for the one or more spray devices, in particular rotating spray arms in the washing mode, which serve to apply wash liquid or wash liquor to washware.

Possibly. The device for applying coolant can also be formed by a rotatably mounted spray arm, which, however, is brought into a specific stationary cooling position, preferably a rest or standstill position, for the majority of the desorption phase in such a way that a liquid spray jet from at least one nozzle of the spray arm on the discharge opening and / or its surroundings for the predominant duration of the desorption phase is directed. This spray arm, which remains in the specific cooling position during the desorption phase, preferably "parked" or fixed there, then likewise forms a specially provided device for the targeted application of coolant to the blow-out opening.

The device for the application of coolant can expediently be fluidly coupled to the existing liquid circulation circuit of the dishwasher, which usually comprises a circulation pump, one or more spray devices arranged in the washing container and associated liquid connection lines, and / or possibly a water switch. Then the speed of the circulation pump is preferably set lower during the respective desorption phase than during the washing or spraying operation of the dishwasher, in which washing liquid is sprayed onto the items to be cleaned from the one or more spray devices, in particular rotating spray arms. This has the advantage that the pump, which rotates more slowly during the desorption phase, can lower the noise level of the dishwasher during the desorption phase compared to the noise level during washing operation, in which the one or more spray devices spray washing liquid onto the items to be washed with the required spray pressure.

Expressed in general terms, the speed of the circulation pump can in particular be set in such a way that during the respective desorption phase essentially no more rinsing liquid (as in the rinsing mode) is sprayed onto the items to be washed by the one or more spray devices, but only from the device for applying coolant only to the items Blow-out opening coolant liquid, especially clear water, is discharged.

Usually, a rinse cycle comprises one or more partial rinse cycles, such as pre-rinsing, cleaning, intermediate rinsing, rinsing, in which washing liquid is sprayed onto the items to be cleaned in the washing container by means of one or more spray devices. The desorption phase can expediently take place during at least one such partial rinse cycle. In particular, it is energy-saving if the desorption phase is carried out at least partially during a partial wash cycle in which the washing-up liquid and / or washware is heated to a minimum temperature is required. Such a partial rinse cycle with rinsing liquid to be heated can in particular be the cleaning cycle and / or rinse cycle. The desorption phase can either take place completely during only one partial rinse cycle or can be divided over several partial rinse cycles.

It can be particularly advantageous if the desorption phase takes place at least partially immediately before the final drying cycle of a dishwasher program. This has the advantage that the water which is expelled from the sorption material during its desorption phase due to its heating up and is conveyed as water vapor through the blow-out opening into the washing container by the air forcibly flowing through the sorption material, also settles on the items to be washed and there any liquid residues, in particular detergent and / or rinse aid residues, are diluted, so that after the drying cycle, stains visible to the user are largely avoided. In addition, the wash ware is heated by the hot air flowing into the wash container from the blow-out opening during desorbing, so that what is known as self-drying of the wash ware is subsequently improved in addition to sorption drying in the drying cycle. The inherent heat drying is based on the difference between the temperature of the wash items and the temperature of the walls of the wash container. The greater the temperature difference and the longer the temperature difference remains during the drying cycle, the better condensation of moisture from the air in the washing compartment occurs on the walls which are cooler than the items to be washed.

Before the sequence of drying cycle with immediately preceding desorption phase, a rinse cycle of a dishwasher program can expediently be carried out. The desorption phase is advantageously carried out during the end section of the final rinse cycle after the spray operation has been stopped. The discharge opening can then be cooled with the rinse aid liquid from the rinse cycle during the desorption phase. According to an advantageous embodiment variant, it can be expedient if, as in the desorption phase, the speed of the circulating pump is also reduced for the rinse cycle preceding the desorption phase compared to a normal rinse cycle (without the desorption phase included). Because this is how rinse aid can be used low pressure is sprayed from the one or more spray devices onto the wash ware and can thus be distributed evenly over the wash ware. A smaller amount of rinse aid liquid is sufficient than for a rinse cycle without a final desorption phase preceding the drying cycle. This goes hand in hand with a lower use of thermal energy to heat this smaller amount of rinse liquid to a desired target temperature.

It can be advantageous if the dishwasher provides a specific dishwashing program that only, i.e. exclusively comprises a rinse cycle and a subsequent drying cycle, a desorption phase being advantageously carried out during the end section of the rinse cycle after the previous spray operation has been stopped. The desorption phase is carried out during this end section of the rinse cycle, and the sorption phase of the sorption drying device is carried out during the drying cycle. The discharge opening can then be cooled with the rinse aid liquid from the rinse cycle during the desorption phase. Such a special program allows items that have already been rinsed, in particular rinsed by hand, to be dried in a particularly spot-free manner. Because during desorption, water is expelled from the sorption material by heating it up and transported by the air forced through the sorption material by means of a blower as water vapor via the blow-out opening into the washing container, where it is also deposited on the items to be washed and any washing and washing agents present there / or rinse aid residues diluted so that staining is largely avoided after the drying cycle.

Possibly. the rinse aid cycle can also be omitted entirely. Then only the desorption phase precedes the drying cycle. In this case, water is expediently supplied as a coolant to the washing container. A specific “only drying” dishwashing program can be provided for this embodiment variant.

If the coolant can be applied independently of the items to be washed, a spray arm, for example, can be unloaded in this phase and also not itself contribute to the development of noise.

In particular, water can be used as the coolant, so that a high cooling capacity and a targeted area-wide application of the blow-out cap are possible. The water in the dishwasher can advantageously be circulated and used repeatedly as a coolant, so that the water requirement is low and continuous heat dissipation is nevertheless possible in this phase.

The application of coolant can advantageously be operated without simultaneous introduction of new washing liquor, in particular fresh water, into the washing container in order to thereby minimize the water circulation and also the required pump power and noise.

If the coolant supply has its own pipe system, this is at least partially independent of a liquid supply system for the wash ware.

If a pipe system dedicated to the application of coolant branches off from an application system for the items to be washed, self-sufficient cooling can be implemented in a structurally simple manner without further use of the pipe system provided for the items to be washed. In particular, the branch of the own pipe system provided for the coolant supply can be designed from the wash load application system in such a way that the pipe system specific for the coolant supply is only acted upon by water at a low flow rate, the water flowing past the branch at a higher flow rate. For example, the branch from a riser pipe to the upper spray arm can be made. Then this only needs to be acted upon with water for cooling down to the branch, i.e. only up to a height of a few centimeters, whereas a rise of several tens of centimeters would be required to act on the upper spray arm. Accordingly, the pumping power for cooling can be significantly reduced.

Visually inconspicuous, the own pipe system for cooling can run at least in areas behind a rear wall of the washing compartment.

For a directional coolant jet that is acoustically optimized in terms of its impact angle and its intensity, the application end of the pipe system for the application of coolant can be narrowed like a nozzle.

The desorption phase of the water-absorbent agent is particularly advantageously within a rinse cycle before a drying phase of the dishes associated with adsorption of the water-absorbent agent, in order to be able to carry out the drying of the washware as the last phase. The processes of desorption, adsorption and other phases can be controlled via an automated process program.

It is also possible that the dishwasher also has a double function for sterilizing items to be washed. The sterilization can preferably already be effected solely by the air flowing out of the blow-out opening during a desorption phase. In addition or independently of this, an additional UV lamp and / or an ozone generator can also be provided for the sterilization, for example.

In summary, a device for supplying coolant to a blow-out device having one or more blow-out openings is provided in addition to the one or more spray devices in the washing container. In particular, it can be advantageous if this device for the application of coolant is designed to be stationary or stationary and to direct at least one water jet onto the blow-out device continuously with the same jet direction during a partial section or the total duration of the respective desorption phase. The jet direction of the jet of coolant, in particular water, emerging from the coolant application device therefore preferably remains the same, i.e. the coolant jet is stationary or largely stationary. This reduces the operating noise of the dishwasher that is perceptible to a user in comparison to a rotating spray arm, from the nozzles of which washing liquid or washing liquor is sprayed into many different spatial directions during its rotational movement and thereby hits different surfaces and parts, which results in a dynamic noise pattern.

Other advantageous developments of the invention are given in the subclaims.

The above-described and / or reproduced in the dependent claims advantageous refinements and developments of the invention can - except z. B. in the case of clear dependencies or incompatible alternatives - individually or in any combination with each other.

Fig. 1

eine schematisch dargestellte Geschirrspülmaschine in perspektivischer Ansicht von schräg vorne bei teilweise geöffneter Tür,

Fig. 2

eine schematische Ansicht eines herausgezeichneten Spülbehälters von schräg vorne mit einem in der hinteren rechten Ecke gelegenen Ausblasöffnung für Luft, die die Sorptionstrocknungseinrichtung durchlaufen hat,

Fig. 3

eine Detailansicht des Bereichs der von einer Kappe übergriffenen Ausblasöffnung, etwa entsprechend dem Ausschnitt III in Figur 2,

Fig. 4

den Bereich nach Figur 3 in Draufsicht,

Fig. 5

den Bereich nach Figur 3 in Ansicht von schräg vorne, und

Fig. 6

ein schematisches Drehzahl- Zeitdiagramm der Umwälzpumpe der Geschirrspülmaschine der Figuren 1 - 5 für die Spülbetriebsphase und die Kühlmittelbeaufschlagungsphase während eines durchzuführenden Spülgangs.

The invention and its advantageous training and further developments and the advantages thereof are explained in more detail below with reference to drawings showing exemplary embodiments. Each shows in a schematic outline sketch:

Fig. 1

1 shows a schematically illustrated dishwasher in a perspective view obliquely from the front with the door partially open,

Fig. 2

2 shows a schematic view of a flushing container drawn out obliquely from the front with a discharge opening for air located in the rear right corner, which has passed through the sorption drying device,

Fig. 3

a detailed view of the area of the discharge opening overlapped by a cap, approximately corresponding to section III in Figure 2 ,

Fig. 4

the area after Figure 3 in top view,

Fig. 5

the area after Figure 3 in oblique view from the front, and

Fig. 6

a schematic speed-time diagram of the circulation pump of the dishwasher Figures 1 - 5 for the flushing operation phase and the coolant loading phase during a flushing cycle to be carried out.

Elements with the same function and mode of operation are provided with the same reference symbols in the figures. Only those components are one Dishwasher provided with reference numerals and explains which are necessary for understanding the invention.

In the Figure 1 schematically shown dishwasher 1 is a household dishwasher and has as part of a body '5 a washing container 2 for receiving items to be processed such as dishes, pots, cutlery, glasses, cooking utensils and. on. The items to be washed can be held, for example, in crockery baskets 11 and / or in a cutlery drawer 10, and / or in another item to be washed, and can be loaded with wash liquor or wash liquor liquid by one or more spray devices, such as rotatably mounted spray arms. The rinsing container 2 can have an at least substantially rectangular plan with a front side V facing the user in the operating position. The front side V can form part of a kitchen front from kitchen furniture standing next to one another or, in the case of a standalone device, also without reference to other furniture.

The rinsing container 2 can be closed in particular on this front side V by a door 3. This door 3 is in Figure 1 shown in a partially open position and then at an angle to the vertical. In its closed position, on the other hand, it stands upright and, according to the drawing, can be swiveled forward and downward in the direction of arrow 4 about its opening about a lower horizontal axis, so that it lies at least almost horizontally in the fully open position.

On its outer and front side V, which is vertical in the closed position and faces the user, the door 3 can be provided with a decorative plate 6 in order to experience an optical and / or haptic upgrade and / or an adaptation to surrounding kitchen furniture.

The dishwasher 1 is designed here as a stand-alone device or as a so-called partially integrated or also as a fully integrated device. In the latter case, the body 5 can also essentially end with the outer walls of the washing compartment 2. A housing surrounding this outside can then be partially or completely unnecessary. In the exemplary embodiment according to the drawing, the movable door 3 is assigned in its upper region an operating panel 8 which extends in the transverse direction Q and which can comprise an engagement opening 7 accessible from the front for manual opening and / or closing of the door 3.

Furthermore, the dishwasher 1 has at least one blow-out opening 9 opening into the washing container 2, via which air can be introduced into the washing container 2 during at least one phase within a program sequence. Other numbers of blow-out openings 9 may also be possible. Protrudes here Figure 2 the blow-out opening 9 at the lower right rear corner of the interior of the washing compartment 2, seen from the front V, through the bottom thereof into the washing compartment 2.

Furthermore, the dishwasher 1 is provided with a sorption drying device 12, which is shown in FIG Figure 2 dash-dotted and only schematically drawn. This contains in phases in a sorption container water-absorbing (adsorbing) agent, in particular based on zeolite.

In order to allow air to be blown into the rinsing container 2 in this version, but also in another embodiment, at least one blower - not shown - is provided, of which air can be moved through the sorption drying device 12, but at least in the direction of the blow-out opening 9 . For example, in the case of circulating air drying, such a blower would also be provided, which would move air in the direction of the outlet opening 9. Enrichment with outside air may be possible.

The dishwasher 1 runs through the partial rinse cycles of different program steps during a wash cycle of a dishwasher program to be carried out, u. a. at least one drying phase (several are also possible), in which an air stream 13 is introduced through the blow-out opening 9 for drying the items to be washed in the washware 2.

In addition to the above-mentioned adsorption phase of the sorption drying device 12, there is also at least one desorption phase of the water-absorbing adsorbent, in which heating (not shown for the sake of clarity) either heats the adsorption material and passes air through it or through it Sorption drying device is heated air. In this way, water that has been stored in and / or on the adsorption material during a preceding drying cycle is expelled from the adsorption material and taken up by the air passed through the adsorption material. Warm, water-containing air is therefore introduced into the washing compartment 2 via the at least one blow-out opening 9 in the desorption phase. This phase can be directly or in the program sequence well before the drying phase, in which air from the washing container 2 is dried in the sorption drying device 12 by adsorption and then returned to the washing container 2.

During the desorption phase, in which the sorption drying device is heated and blows out correspondingly hot air into the rinsing container 2, the blow-out opening 9 can be cooled by means of a separate and directed coolant supply.

Coolability means that cooling does not have to take place during the entire desorption phase, but can. The cooling can also be switched on and off in a clocked manner or can only be in operation during part of the desorption phase.

Water, possibly with cleaning or drying agents, is used as the coolant. This is applied in the appropriate phase in order to minimize noise in a jet 14 that is as uniform as possible on the blow-out cap 15, which covers the blow-out opening 9. The water in the dishwasher can be circulated and used several times as a coolant. The consumption is therefore low. In each cycle, thermal energy can be dissipated from the cap 15.

The coolant can be carried out independently of the wash load with detergent or other washing liquor, i. that is, even if coolant is passed onto the cap 15, no further moisture has to be introduced into the washing container 2, in particular there has to be no action on the items to be washed.

As shown here, the coolant supply as a water-carrying channel can have its own separate pipe system 16, which is at least partially independent of an application system for the items to be washed. This channel is directed only onto the inflation cover 15 and, in contrast to the rotating nozzles, produces the spray arms make no big noise. A spray arm 17 therefore does not have to be used for cooling. The own pipe system 16 branches off from a loading system for the items to be washed, namely from a riser pipe 18, which can, for example, supply an upper rotating spray arm with water. The water jet 14 used for cooling can be set in a defined manner and acoustically optimized. This active cooling can reduce the overall noise by more than 0.5 dB (A) in the overall level.

When designing the pipe system 16, several variants are possible: the channel can be created via a separate channel behind a water switch, or a simple coupling can be provided on the riser pipe 18. With this option, the intervention in the system is limited to a modified feed pipe, which is desirable from a complexity point of view.

The own pipe system 16 is only exposed to water at a low flow rate, while at a higher flow rate the water runs past branch 19 upwards. This allows the pipe system 16 to be acted upon with a very low output and very low noise level from a water circulating pump. This pump can be the same that also supplies the spray arms with rinsing liquor under high load, so that the design effort for the extra cooling is very low.

In the Figures 2 and 5 a circulating pump PU is shown in dash-dot lines as a component of a liquid circulation system which is provided for the loading of washware with washing liquor liquid. It is connected on the inlet side via a suction pipeline SL, which is also shown in dot-dash lines, to the pump pot or liquid collection area 21 of the bottom of the washing container 2, from where it draws in washing liquid which collects during pump operation. On the output side, it is connected to a water diverter WS, also shown in dash-dotted lines, via a pressure pipeline PL, also shown in broken lines. A first outlet pipeline L1 leads from the water switch WS to the lower spray arm 17 (see Figure 5 ), a second outlet pipeline L2 to branch 19, which leads via the riser 18 to the upper spray arm and / or another upper spray device such as a roof shower, which here in the Figures 1 - 5 have been omitted for the sake of clarity. The Pumping power of the circulation pump PU can be set by means of a control device of the dishwasher 1. This control device is in the Figure 5 additionally indicated by dash-dotted lines and labeled SG. In particular, the speed n (unit rpm (= revolutions per minute)) of the circulating pump PU can be controlled via a (in the Figure 5 Specify signal line CL2 (also shown in dash-dotted lines) from the control device SG. Via a signal line CL1, the control / regulating device SG can change the positions of the water switch WS with regard to the fluidic coupling of the outlet pipelines L1, L2 to the pressure pipe PL of the circulation pump PU, depending on the desired washing mode in the respective program step of a dishwashing program. For example, in a program step of a selected dishwashing program, only the outflow pipe line L1 to the lower spray arm 17 can be fluidly connected to the pressure pipe PL of the circulation pump PU by means of a correspondingly selective water switch position. Alternatively, in another program step of the dishwashing program, only the outlet pipe line L2 to branch 19 can be fluidly connected to the pressure pipe PL of the circulation pump PU by means of a correspondingly selective water switch position. Possibly. so-called interchangeable arm spraying is also possible by continuously changing the water switch position for alternately coupling the pressure pipe PL to the first or second outlet pipeline L1, L2 (in addition to other, further setting options) in the respective program step.

Alternatively, however, the WS water switch in the liquid circulation system can also be dispensed with entirely. Then the pressure pipe PL is preferably connected to the two outlet pipes L1, L2 simultaneously via a Y connecting pipe section.
The own pipe system 16 can run optically inconspicuous, at least in regions, behind a rear wall of the washing compartment 2. Here, laying from the covered riser pipe 18 is shown in the visible area of the washing compartment 2.

Furthermore, in order to reduce the risk of scalding for an operator, it is useful to arrange the blow-out opening 9 in a lower corner region of the washing compartment 2 near the rear wall thereof.

In order to make it possible for the water jet 14 to act on the cap 15, an application end 20 of the pipe system 16 for the application of coolant is directed at the blow-out opening 9, in particular a blow-out cap 15 enclosing this, which is made, for example, of stainless steel. In order to form the desired jet 14, the application end 20 of the pipe system 16 for the application of coolant can be narrowed in a nozzle-like manner, as here, for example, in FIG Figure 3 is clearly recognizable. In addition, the loading end 20 can be aligned such that it is about 1 to 2 cm above the cap 15 at its edge and floods the entire top of the cap 15 with its water jet 14.

Usually, the respective rinse cycle comprises one or more partial rinse cycles or rinse steps such as, for example, a pre-rinse cycle, cleaning cycle, intermediate rinse cycle and rinse cycle, in which each washing or rinsing liquid ("rinsing liquor") is sprayed onto the one or more by means of one or more spray devices in the rinsing container several recordings, in particular crockery baskets, is sprayed. To supply these spray devices, a circulation pump is provided, which sucks the washing liquid converging there from a pump pot or liquid collection area in the bottom of the washing container via a suction line and pumps it under pressure into one or more supply pipes into the one or more spray devices. Possibly. a partial rinse such as the pre-rinse and / or the intermediate rinse can be omitted. In particular, a dishwashing program can also be provided, which has only a single wash cycle, such as, for example, only the rinse cycle for loading washware with washing liquid, in particular rinse liquid. The last step in the respective rinsing cycle is expediently a drying phase in which moisture from the rinsing container 2 is adsorbed in the sorption drying device 12. It is therefore advantageous if the desorption phase of the water-absorbent agent is within a rinse cycle before a drying phase of the dishes associated with adsorption of the water-absorbent agent. For example, the desorption phase can be directly before drying. In this case, the water vapor formed would at the same time prevent stains from forming on the items to be washed, in that residues of washing liquid, in particular water mixed with rinse aid, are diluted by the moist steam. At the same time, the hot, humid air also delivers very good sterilization results. The dishwasher 1 is therefore also a sterilizer usable. For this, there is also no need to precede a partial rinse with washing liquid, but dishes that have been washed by hand, for example, can only be put into the dishwasher 1 for sterilization and drying. For this purpose, a special dishwashing program can expediently be provided, which only carries out the drying cycle and / or the sterilization cycle. In addition, a UV lamp or an ozone generator can also be provided for sterilization.

All processes of desorption, adsorption and other phases can be controlled, in particular, via a sequence program, in which, for example, pure sterilization can also be set.

An optional program design can also be possible, for example in noise-sensitive programs (for example night program) with blow-off cap cooling and in programs which are sensitive to the purge performance, with the cooling of the blow-out cap 15 over the entire spray system.

Overall, the invention results in an additional noise reduction. At the same time, a very defined loading and cooling of the blow-out cap 15 is possible. The cooling cannot be covered by loading the washing compartment 2. Retrofitting is possible due to the integration of the pipe system 16 and the small length behind the branch 19. There is no major impact on the rest of the series.

Figure 6 shows a schematic speed / time diagram for setting the speed of the pump during the course of a rinse cycle SG. The time t is plotted along the abscissa in minutes (min) and the respective speed n (in rpm = revolutions per minute) is plotted along the ordinate. The rinse cycle SG here includes, for example, the liquid-carrying partial rinse cycles pre-rinse VG, cleaning RG, intermediate rinse ZG and rinse-off KG as well as the final drying cycle TG. It lasts from the start time tA to the end time tE. At the end of the respective liquid-carrying partial rinse cycle, such as, for example, a pre-rinse cycle, a cleaning cycle, an intermediate rinse cycle, a partial or complete pumping out of the rinsing liquid from the rinsing container is expediently carried out by means of an emptying pump, which is omitted in the figures for the sake of clarity. At the end of the last fluid Partial rinse cycle, here the rinse cycle, the rinsing liquid is pumped out of the rinsing container as completely as possible. During the partial rinse cycles VG, RG, ZG and KG, washing liquid is sprayed onto the items to be washed by means of the lower and / or upper spraying device. The desorption phase KB can preferably be carried out immediately after the end of the spray operation of the rinse aid KG before the drying stage TG. The circulation pump PU works with a first set speed n _SP during the partial rinse cycles VG, RG, ZG and with a lower second set speed n _DE during the desorption phase KB during the rinse cycle KG, which takes place partially or completely during its final section. So there are n _SP > n _DE . For the desorption phase KB, the water switch WS is expediently brought into a position by the control device SG via the signal line CL1 such that its outlet pipe L1 is closed to the lower spray arm 17 and only the outlet pipe L2 to the branch 19 is open. The speed of the circulation pump is preferably set by the control device SG via the signal line CL2 in such a way that the pump pressure of the circulation pump PU is not sufficient for rinsing liquid to rise above branch 19 into the riser pipe 18 to the upper spray device (s), but instead essentially only flows into the specially provided, separate, in particular here essentially horizontally running, cooling tube 16 and exits from its end opening 20 and flows from there onto the cap 15. In terms of height, the outlet end 20 of the cooling tube 16 is preferably somewhat higher than the cap 15, so that the outflowing cooling liquid can flow over it from above. This ensures effective cooling of the cap 15 and thus the blow-out opening 9 during the desorption phase. In this way, the area around the blow-out opening, in particular the cap 15 above the blow-out opening 9, and thus the air flowing out of the blow-out opening 9 during the desorption phase can be cooled with the rinse aid liquid in a targeted manner via the specially provided pipe system 16. The air flowing out of the blow-out opening 9 during the desorption phase preferably only has a temperature of less than 70 ° C. Due to the reduced speed n _{DE of} the circulation pump during the desorption phase KB, in particular the noise of the dishwasher can be reduced during the desorption phase.

If the speed of the circulation pump - as here in the embodiment of Figure 6 - Also reduced during the spray operation of the rinse cycle preceding the desorption phase KB compared to a rinse cycle without a desorption phase, this results in a further reduction in noise over the entire duration of a dishwasher program. Here in the embodiment of Figure 6 the spray operation takes place in the rinse cycle, for example at a reduced speed n of the circulation pump PU, which essentially corresponds to the speed n _DE in the subsequent desorption phase KB (without spray operation). By lowering the speed of the circulation pump when spraying in the rinse cycle, the rinse aid liquid can be applied largely uniformly to the wash ware without greater pressure. It is sufficient to use a smaller amount of rinse aid than with a normal rinse cycle. For heating such a reduced amount of rinse aid liquid to a desired target temperature, less energy is advantageously required.

In particular, it may be expedient if a specific “only drying” dishwashing program is provided, in which the partial rinse cycles VG, RG, ZG, KG are omitted and only one desorption phase and the subsequent drying cycle TG with the contained adsorption phase are present. During the desorption phase, the outlet opening 9 is expediently cooled by means of the specially provided coolant admission, here through the pipe system 16, as explained above. In this case, the rinsing tank is expediently given clear fresh water for the desorption phase as a coolant, e.g. fed to the dishwasher via the water supply system. During the desorption phase, no spray operation is expediently carried out by the one or more spray devices present in the washing container.

In a departure from this "only drying" dishwashing program, it may be expedient if a specific "rinse and dry" dishwashing program is provided in which the partial rinse cycles VG, RG, ZG are omitted and only one rinse cycle KG with a desorption phase at the end and a subsequent one Drying cycle TG with contained adsorption phase are present. During the desorption phase, such as KB, the water switch WS is expediently set by the control device SG via the signal line CL1 in such a way that the outlet pipe L1 is closed to the lower spray arm 17 and only the outlet pipe L2 to Branch 19 is released. The speed of the circulation pump is then preferably selected such that the cooling liquid, here rinse liquid, cannot rise above the branch 19 into the riser 18 to the one or more upper spray devices, but only flows into the cooling pipe 16 and from there onto the Cap 15 flows over the discharge opening 9. During the desorption phase, no spraying operation is carried out via the one or more spraying devices. Since the desorption phase is advantageously carried out during the end section of the rinse cycle after the previous spray operation has been set, the outlet opening can be cooled with the rinse aid liquid from the rinse cycle during the desorption phase before it is finally pumped off before the start of the drying cycle. Such a special program allows items that have already been rinsed, in particular rinsed by hand, to be dried in a particularly spot-free manner. Because during desorption, water is expelled from the sorption material by heating it up and transported by the air forced through the sorption material by means of a blower as water vapor via the blow-out opening into the washing container, where it is also deposited on the items to be washed and any washing and washing agents present there / or rinse aid residues diluted so that staining is largely avoided after the drying cycle.

The explanations given above regarding advantageous exemplary embodiments of the invention refer in particular to the following reference symbols in the figures: <b> List of reference symbols </b> 1 Dishwasher, 15 Cap, 2nd Processing container, 16 Pipe system, 3rd Door, 17th Spray arm, 4th Swivel direction, 18th Riser pipe, 5 Body, 19th Branch, 6 Decorative panel, 20th End of application, 7 Intervention opening, 21 Pump pot, 8th Control panel, 9 Discharge opening, CL1, CL2 Control line 10th Cutlery drawer, DL Pressure line, 11 Crockery basket, KB Desorption phase 12th Sorption drying device, KG Rinse aid 13 Airflow, L1, L2 Outgoing line, 14 Water jet, n number of revolutions PU Pump, Q Cross direction, RG Cleaning cycle SG Rinse cycle SRE Control device, SL Suction line, t time tA, TE Times TG Drying cycle V Front, VG Pre-rinse WS Water switch ZG Intermediate rinse cycle

Claims (15)

1. Dishwasher (1), in particular household dishwasher, with a dishwasher cavity (2) for cleaning dishware, glasses, cutlery or similar items to be washed and with a means of a sorption drying facility, in particular based on zeolite, which absorbs water in a phased manner, wherein during at least one desorption phase of the water-absorbing means, heated and water-containing air is able to be conducted via at least one exhaust opening (9) into the dishwasher cavity (2), and with one or more spray facilities, in particular spray arms which rotate during washing operating, which are present in the dishwasher cavity (2) and serve to apply wash liquid or wash liquor to items to be washed,
   characterised in that
   the exhaust opening (9) is able to be cooled via an application of coolant which is specifically provided, separate and aimed at the exhaust opening (9), this being provided additionally to the one or more spray facilities in the dishwasher cavity, or that the exhaust opening (9) is able to be cooled via an application of coolant which is specifically provided and aimed at the exhaust opening (9), this being formed by a rotatably mounted spray arm, said spray arm however being brought into a specific stationary position for most of the duration of the desorption phase, such that a liquid spray jet from at least one nozzle of the spray arm is aimed at the exhaust opening (9) and/or the surrounding area thereof for most of the duration of the desorption phase.
2. Dishwasher (1) according to claim 1,
   characterised in that
   the application of coolant is able to be performed independently of the spraying of the items to be washed.
3. Dishwasher (1) according to claim 2,
   characterised in that
   water is used as coolant.
4. Dishwasher (1) according to one of claims 1 to 3,
   characterised in that
   the water in the dishwasher (1) is able to be recirculated and used as coolant multiple times.
5. Dishwasher (1) according to one of claims 1 to 4,
   characterised in that
   the application of coolant is able to be operated without the simultaneous introduction of wash liquor into the dishwasher cavity (2).
6. Dishwasher (1) according to one of claims 1 to 5,
   characterised in that
   the application of coolant possesses a specific pipe system (16) which is at least partially independent of a pipe system provided for the spraying of the items to be washed.
7. Dishwasher (1) according to claim 6,
   characterised in that
   the specific pipe system (16) branches off from the pipe system provided for the spraying of the items to be washed at a branch (19).
8. Dishwasher (1) according to claim 7,
   characterised in that
   water is only applied to the specific pipe system (16) when at low a flow speed; at a higher flow speed the water flows past the branch (19).
9. Dishwasher (1) according to one of claims 6 to 8,
   characterised in that
   the specific pipe system (16) runs behind a rear wall of the dishwasher cavity (2), at least in sections.
10. Dishwasher (1) according to one of claims 1 to 9,
    characterised in that
    an exhaust opening (9) is situated in a lower corner region of the dishwasher cavity (2), near its rear wall.
11. Dishwasher (1) according to one of claims 1 to 10,
    characterised in that
    an application end (20) of the pipe system (16) for the application of coolant is aimed at the exhaust opening (9), in particular an exhaust flap (15) which borders it.
12. Dishwasher (1) according to claim 11,
    characterised in that
    the application end (20) of the pipe system (16) for the application of coolant is narrowed in the manner of a nozzle.
13. Dishwasher (1) according to one of claims 1 to 12,
    characterised in that
    the desorption phase of the water-absorbing means within a wash cycle takes place in advance of a drying phase of the dishware which accompanies an adsorption of the water-absorption means.
14. Dishwasher (1) according to one of the preceding claims,
    characterised in that
    the processes of desorption, adsorption and further phases are controlled via a process program.
15. Dishwasher (1) according to one of the preceding claims,
    characterised in that
    said dishwasher also forms a steriliser for items to be washed in a dual function.

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