EP2292132A2 - Dishwasher and controlling method thereof - Google Patents

Abstract

The dishwasher (1) has a sequencing controller (19) in which a washing program to control a wash cycle for cleaning dishes is stored. A washing chamber (2) receives the dishes during the wash cycle. A water feed device (5) includes hot water inlets (6, 7) for receiving hot water from an external hot water supply (WH) and cold water inlets (8, 9) for receiving cold water from an external cold water supply (KH). The washing program comprises program steps to wash the dishes using the hot and cold water from the hot and cold water supplies, respectively. An independent claim is also included for a method for controlling a wash cycle for cleaning dishes.

Description

The present invention relates to a dishwasher, in particular a domestic dishwasher, with a sequence control device, in which one or more wash programs for controlling at least one wash cycle for cleaning items to be stored, with a washing container for receiving items to be washed during the wash cycle and with a Sorptionstrockenvorrichtung, which Having sorption with a reversibly dehydratable material.

In modern dishwashers, the items to be washed, in particular items to be washed, are introduced into a washing container and are there cleaned in a rinsing process, which is also called a rinse, with the aid of water and then dried. The aim is to perform a rinse so that a predefined cleaning result and a predefined drying result are achieved as efficiently as possible. Demanded is a high overall efficiency, which preferably results from the cleaning efficiency and the drying efficiency. The cleaning efficiency corresponds in particular to the ratio of the cleaning result achieved by means of a rinse cycle and the effort required for this purpose, wherein the effort can comprise several dimensions, for example the energy requirement, the water requirement and / or the time requirement. Furthermore, the drying efficiency corresponds in particular to the ratio of the drying result achieved by means of a rinse cycle and the effort required for this purpose, wherein the effort here can also include several dimensions, for example the energy requirement and / or the time required.

In modern dishwashers usually a flow control device is provided, in which one or more wash programs for controlling a wash cycle for cleaning items to be stored are stored. The sequence control device is designed such that it automatically controls a rinse cycle according to a rinse program usually selected by an operator. The water required for carrying out rinses can be taken up in known dishwashers via a water inlet device, which water For example, from a building-side installed water supply can accommodate.

A wash program has several successive program steps for the treatment of the items to be washed, wherein the water is provided in the water-conducting program steps depending on the respective program step with cleaning and / or additives and brought to a favorable temperature for each program step. In order to be able to provide the water intended for rinsing with the intended cleaning and / or additives, modern dishwashers usually have automatic dosing devices. Furthermore, dishwashers may have a conventional electric heater to bring the water intended for rinsing to the required temperatures.

A typical washing program for cleaning the items to be washed in this time sequence comprises, in particular, a pre-rinsing step, a cleaning step, an intermediate rinsing step and a rinsing step in which the items to be washed are each supplied with water. However, it is also possible to provide rinsing programs in which one or more of these program steps are hidden. Also, rinse programs are possible in which one or more of these program steps are repeated several times. Furthermore, a typical washing program includes an adjoining drying step for drying the cleaned items to be washed.

A pre-rinse step serves primarily to remove coarse contaminants from the items to be washed. The purpose of a subsequent cleaning step is to completely remove contaminants from the dishes. A now performed intermediate rinsing step serves in particular for the removal of detergent residues which adhere to the items to be washed. A subsequent rinse step is intended in particular to avoid stains on the items to be washed, which could be caused by dissolved substances in the water, such as, for example, salt and / or lime. For this purpose, the water is added during the rinse step with rinse aid.

In a dishwashing machine with a so-called self-drying, another object of the rinsing step is to prepare the subsequent drying step. The items to be washed are heated to a high temperature during the rinse step. In the final drying step, water droplets adhering to the hot items evaporate and are deposited on the inside of the rinse container due to the lower temperature prevailing there.

Other known dishwashers have a sorption drying device for drying the items to be washed, which comprises a sorption device with a reversibly dehydratable material. The operating principle of a sorption drying device is that, during the drying step, water vapor, in some cases another sorbable medium, is deposited by the reversibly dehydratable material, which may be zeolite, for example, whereby the reversibly dehydratable material heats up. An airflow generated, for example, by a fan is heated by the heat thus generated and introduced into the washing, where it absorbs moisture and thus dries the dishes.

In a first type of sorption drying apparatus, a moist air flow from the rinsing container is passed through the reversibly dehydratable material during the respective drying step, where it releases its absorbed moisture, which in turn releases heat which the air flow at least partially absorbs.

In a second type of sorption drying apparatus, in the respective drying step, a humid air flow is guided along a cooled condensing surface, whereby it is dried. The condensation surface can be located, for example, in the rinsing container or outside thereof in a tube, a conduit or the like which directs the air flow to the reversibly dehydratable material. The dried air stream is then passed past the reversibly dehydratable material, which further warms it. In the second type, the condensation surface can be cooled by connecting a container, which is connected to the sorption device for exchanging a medium which can be sorbed by the sorption device, in a heat-conducting manner to the condensation surface. During the drying step, it is provided that in the container by a reversible dehydratable material sorbable medium, for example water, evaporated or sublimed. The resulting evaporation cold then cools the container and the condensation surface. The now gaseous medium is passed to the reversibly dehydratable material and sorbed there, whereby the reversibly dehydratable material, as already mentioned, is heated.

In both types, the reversibly dehydratable material is desorbed at the latest when its absorption capacity for water vapor (or other medium) is exhausted. For this purpose, the reversibly dehydratable material is heated, so that the sorbed medium dissolves from the reversibly dehydratable material.

In this way, in many cases, the temperature to which the items to be washed are heated during the rinse step, chosen lower or can be completely dispensed with a heating of the dishes during the rinse step. This results in a higher drying efficiency compared to a dishwasher without Sorptionstrockenvorrichtung.

Against the background of increased energy and water costs, but also against the background of a generally increased environmental awareness as well as changed living habits of further parts of the population, a need has developed for even more efficient household dishwashers.

A disadvantage of the known dishwasher equipped with a storage container is that it no longer meets the current need for efficiency.

The object of the present invention is to provide a dishwashing machine equipped with a sorption drying device, which makes it possible to carry out rinse cycles more efficiently.

The object is achieved in a dishwasher of the type mentioned above in that a water inlet device is provided which has a hot water inlet and a cold water inlet, wherein the hot water inlet for receiving hot water from an external hot water supply and the cold water inlet is provided for receiving cold water from an external cold water supply, at least one program step for rinsing items to be washed using hot water from the hot water supply and at least one program step for rinsing items to be washed using cold water from the cold water supply is.

This program-step-specific supply of cold water or hot water enables further energy savings and thus increased energy efficiency. Since each program step of a selected and started dishwashing program is converted by the process control device into a corresponding partial wash cycle of a wash cycle, the dishwasher is therefore supplied with partial wash cycle-specific cold water or hot water. Thus, the drying performance of the Sorptionstrockenvorrichtung the respective sorption process and their contribution to the drying cycle of each rinse, and / or the use of waste heat generated during the respective desorption of Sorptionstrockenvorrichtung, for heating a Spülbadmenge at least one Teilspülgangs the respective rinse can be improved.

Dishwashers, especially household dishwashers, are usually operated in locations where a hot water supply and a cold water supply is available. The temperature of the hot water typical fixed hot water supplies may for example be in a range of 40 ° C to 70 ° C. By contrast, the temperature of the cold water of typical fixed cold water supplies is in the range of 5 ° C to 15 ° C.

A water inlet device, which has a hot water inlet and a cold water inlet, makes it possible to carry out a rinse cycle for cleaning and / or drying of dishes in a more efficient manner. Thus, now rinsing programs for controlling a rinse are possible, which provide the implementation of individual program steps using hot water from an external hot water supply and the implementation of other program steps using cold water from an external cold water supply. In this way, both compared to known dishwashers, which - as before common in Europe - are provided exclusively for connection to a cold water supply, as well as with respect to known dishwashers, which are - as usual especially in North America - exclusively for connection to a hot water supply, a considerable increase in efficiency can be achieved.

If a program step by its nature requires or at least makes desirable the use of water at a high temperature, hot water can be taken from the external water supply for this program step. The hot water can be taken before or during the respective program step.

Taking hot water for such a program step is in many cases more energy and cost efficient than taking cold water. The reason for the increased cost efficiency is that when receiving hot water, the internal electrical energy consumption of the dishwasher for a rinse by a reduced electrical energy consumption for heating the absorbed water drops significantly. This can lead to a significant reduction in household electricity costs. This saving is greater in many cases, as the additional cost of generating the hot water of the external hot water supply. In this way, an increase in efficiency compared to a dishwasher can be achieved, which is provided exclusively for connection to a cold water supply.

This is especially true if the household a modern condensing boiler, a cogeneration plant or a district heating system is available. However, the cost advantage can be further increased if the household has a geothermal heat pump or a solar system for generating hot water.

Furthermore, for a program step in which the use of high temperature water has no advantages or disadvantages, cold water can be taken up from the external cold water supply. Again, the recording cold water before or during the respective program step.

Unlike a dishwasher, which is intended exclusively for connection to a hot water supply, so spültechnologische disadvantages can be avoided, which could occur by a forced use of hot water in specific program steps. In addition, by the partial absorption of cold water from the external cold water supply, the amount of hot water, which must be removed from the external hot water supply for a rinse can be reduced, without thereby substantial disadvantages in terms of cleaning effect and / or the drying effect would have to be accepted. In this way it can be ensured that the saving of electrical energy for the operation of an electric heater of the dishwasher and the additional effort to provide a sufficient amount of hot water by means of the external hot water supply are in a favorable ratio.

The dishwasher according to the invention realizes the mentioned advantages in that in at least one of the wash programs at least one program step for washing items to be washed using hot water from the hot water supply and at least one program step for washing items to be washed using cold water from the cold water supply are provided.

In a program step for rinsing items to be washed, the achievable cleaning effect depends on the temperature of the water used for rinsing. Therefore, in many cases it is desirable or even necessary to use water which has a higher temperature than water of a conventional cold water supply. Therefore, the use of hot water in such a program step, a significant amount of energy can be saved, which would have to be expended when using cold water to its heating.

On the other hand, in the desorption of the sorption the reversibly dehydratable material to very high temperatures, for example, to 300 ° C, heated. Some of the heat usually generated by means of an electric heater is used to overcome the binding forces between the sorbed medium and the reversibly dehydratable material. The other part is available in the form of waste heat for further use. It is provided to use the heat generated during a desorption of the sorption waste heat to heat at least the water required for a program step for rinsing items to be washed. In general, a sufficiently large amount of waste heat is available to bring even low temperature water to a temperature required for a program step to wash dishes. This is true even for program steps where a higher temperature is required or desired. Therefore, at least for one program step cold water from the cold water supply can be used without this would have to be heated with higher electrical energy input. At the same time, the amount of heat withdrawn from the hot water supply can be reduced without the cleaning result being appreciably worsened.

According to an advantageous embodiment of the invention, the cold water is heated by means of waste heat, which is formed at a desorption of the sorption in at least one program step for which is provided for rinsing wash ware cold water from the cold water supply.

Another advantage of the use of cold water from the cold water supply in a program step for washing items, during which the sorption is desorbed results from the fact that when using cold water from the cold water supply compared to a use of hot water from a hot water supply at least set a lower temperature level at the beginning of the desorption in the washing container. As a result, the water intended for rinsing can absorb more of the waste heat generated during desorption. If, for example, an air flow is provided which is guided in a loop from the sorption device into the rinsing container and out of the rinsing container back to the sorption device, then this air flow cools more in the rinsing container and thus has a lower temperature when it reaches the sorption device reached again. In this way, overheating of the reversibly dehydratable material can be prevented.

According to a preferred development of the invention, it is provided that the sorption drying device has an air guidance system for generating an air flow from the sorption device into the washing container, wherein at least one of the washing programs is intended to generate the air flow during the desorption of the sorption device so as to flush To wash dishes provided cold water from the cold water supply by means of waste heat, which arises during desorption. In many cases, such an air guiding system for generating an air flow is provided to guide during the drying step relatively dry air in the washing compartment, so as to dry the dishes. The use of this air guiding system, which may include a fan as well as pipes, conduits or the like, during desorption, makes it possible in a simple manner to remove waste heat from the sorption device and to heat water in the washing compartment. This results in a simple structural design of the dishwasher.

According to a preferred embodiment of the invention can be provided that at least one of the washing programs at least one cleaning step for rinsing dishes provides, in which a loading of items to be washed with cold water from the cold water supply, which is heated by means arising during desorption waste heat takes place. A cleaning step is used to thoroughly clean the dishes. For this purpose, it is necessary to apply water to the wash ware, which has a comparatively high temperature in order to achieve a high thermal cleaning effect. In addition, water is generally added to the detergent whose chemical cleaning action is best at a higher temperature. Usually, therefore, a temperature of about 50 ° C to 70 ° C is provided for a cleaning step. By the use of desorption waste heat for heating cold water from the cold water supply, a high saving of electrical energy can be achieved here, since it is only a small amount or no longer necessary, the cold water from the cold water supply through the device's internal, electrical Heating or reheating the heater to bring it to a required target temperature. in this connection the waste heat input into the Spülbadaufheizung the respective Teilspülgangs to a desired setpoint temperature may already be sufficient, so that it is not necessary to use the device-internal heating device for additional reheating and / or to withdraw heat energy from the hot water supply. As a result of the relatively high heat requirement of the cleaning step, a large part of the waste heat released during the desorption can be usefully used to heat rinse liquor liquid in at least one partial rinse cycle. In this way, the overall efficiency of the dishwasher continues to increase. As a result of this use of the desorption waste heat for the respective partial wash cycle, in particular cleaning cycle of a wash cycle, the device-internal, electrical heating device in the liquid circuit system of the dishwasher can possibly even be dispensed with altogether, ie omitted.

Additionally or independently thereof, it may be appropriate if in particular a residual amount of hot water for the provision of a certain amount of flushing for a Teilspülgang, which requires heating the Spülbadmenge to a certain minimum temperature, is drawn from the hot water supply, if the waste heat from the respective desorption is not sufficient to heat the Spülflottenflüssigkeit the Spülbadmenge for each Teilspülgang to the desired target temperature. Additionally or independently thereof, the rinsing liquor for the respective partial rinse cycle can possibly also be reheated with the device-internal heating device in the liquid circuit system of the dishwasher.

According to a preferred embodiment of the invention, at least one of the washing programs provides a pre-rinsing step for rinsing items to be washed in which, in preparation for a cleaning step, items of hot water are supplied from the hot-water supply. The pre-rinsing step serves to remove coarse contaminants from the dishes to prepare a cleaning step. In principle, no higher temperatures are required for this purpose. However, the removal of the coarser dirt by higher temperatures during the pre-rinse step can be accelerated in many cases. Thus, the required cleaning effect of the pre-rinse step can be achieved in a shorter time. In this case, by the use of hot water from the external hot water supply the electrical energy consumption of the dishwasher can be further reduced.

According to an advantageous development of the invention, at least one of the rinsing programs provides an intermediate rinsing step for rinsing items to be washed, in which, for removing detergent from the items to be washed, a loading of items to be washed with hot water from the hot water supply takes place after a cleaning step. An intermediate rinsing step serves in particular for the removal of detergent residues which adhere to the items to be washed after a cleaning step. Again, the desired effect of the intermediate rinse step can be achieved in a shorter time if water with a higher temperature is used. By using hot water from the external hot water supply, the electrical energy demand of the dishwasher can be further reduced.

According to an advantageous development of the invention, at least one rinsing program provides a rinsing step for rinsing items to be rinsed, in which a load of items to be washed with cold water from the cold water supply takes place. A rinse step serves in particular to avoid stains on the dishes, which could be caused by dissolved substances in the water, such as salt and / or lime. For this purpose, the water is added during the rinse step with rinse aid. In a dishwasher with a sorption drying device, it is generally not necessary to heat the items to be washed during the rinse step to a higher temperature, but it is sufficient for the most part or even alone the waste heat in desorbing the sorbent material of the sorption. Therefore, cold water from the cold water supply can be used without problems, in particular for the rinse cycle effected by the respective rinse step, without this having to be additionally heated or heated with higher electrical energy input. At the same time, the amount of heat withdrawn from the hot water supply can be reduced and yet a satisfactory drying result can be achieved within a reasonable time.

According to an advantageous, alternative development of the invention, in addition to or independently thereof, at least one rinsing program can be followed by a final rinse step Provide rinsing of items to be washed, in which a loading of items to be washed with hot water from the hot water supply. In a dishwasher with a sorption drying device, a drying step can be accelerated if the dishes are heated during the preceding rinse step. For this purpose, during the rinsing step hot water, which for example has a temperature of 60 ° C to 75 ° C, can be used. In this case, it is favorable to use hot water from the hot water supply for the final rinse step, since this also ensures that the heat energy withdrawn from the hot water supply is used meaningfully. Thus, a high saving of electrical energy can be achieved here as well, since the hot water from the hot water supply in many cases not at all, in other cases only to a small extent, must be reheated by the electric heater of the dishwasher to reach the desired temperature. Overall, such a program can have a much shorter duration than a program in which unheated cold water from a cold water supply is used during the rinse cycle, but consumes slightly more energy, which is removed from the hot water supply. It therefore makes sense to deposit both programs in the process control device of the dishwasher, so that the operator can select one of the programs as needed.

According to an advantageous development of the invention, the hot water inlet device and / or the cold water inlet device can be assigned a free flow path. The free flow path or the free flow paths can be arranged for example in the reservoir. The free flow paths avoid sucking back of water in the direction of the hot water supply or the cold water supply, which could occur at a temporary negative pressure resulting from dynamic processes. In this way, in particular a too low water level in the reservoir and / or in the washing can be avoided.

According to a preferred embodiment of the invention, the hot water supply, a hot water valve and the cold water inlet include a cold water valve, wherein the hot water valve and the cold water valve independently be controlled by the flow control device. This makes it possible in a simple manner to carry out the intended by the wash program recording hot water from the hot water supply and provided by the wash program recording of cold water from the cold water supply. In particular, can be dispensed with an external device for controlling the water absorption.

According to an expedient development of the invention, it is provided that the hot water valve is arranged at an upstream end of a hot water hose and adapted to be fastened to a fitting of the external hot water supply, and / or that the cold water valve is arranged at an upstream end of a cold water hose and so is formed so that it is attachable to a connector of the external cold water supply. For this purpose, the hot water valve and / or the cold water valve can have, for example, connection threads which correspond to threads of domestic taps. Such valves can be designed in particular as Aquastop valves.

The arrangement of the hot water valve and / or the cold water valve at the upstream end of the water inlet device has the advantage that practically no leakage water can escape from the dishwasher even in the event of damage, as long as the valves are closed. If the valves are designed to close when not energized, leaking of leakage water from a switched-off dishwasher is prevented in virtually all cases. In order also to prevent leakage of leakage water from a switched-on dishwasher, the flow control device may be associated with a leak water sensor for detecting leakage water so that the flow control device can close the valves when leakage water occurs during operation of the dishwasher.

According to a preferred embodiment of the invention, it is provided that a downstream end of the hot water hose and a downstream end of the cold water hose are connected via a connecting piece liquid-conducting jeweiwls with a supply hose, which with a housing-fixed connection piece the dishwasher is connected. Such a design of the water inlet device is structurally simple and significantly shortens the hose length required in many cases, especially if the connection points of the external hot water supply and the external cold water supply are further removed from the installation of the dishwasher, since in this case dispensed two longer parallel tubes can.

The invention also relates to a method for controlling at least one rinse cycle for cleaning items to be washed by means of one or more rinse programs, which are stored in the flow control device of a dishwasher, in particular domestic dishwasher, wherein the dishwasher a rinse tank for receiving items to be cleaned during the rinse cycle and a Sorptionstrockenvorrichtung comprising a sorption with a reversibly dehydratable material, which is characterized in that in at least one program step of rinsing wash ware hot water from an external hot water supply and at least one program step for rinsing ware cold water from the cold water supply is used.

Other embodiments and further developments of the invention are given in the dependent claims. The above-explained and / or reproduced in the subclaims advantageous embodiments and developments of the invention can be used individually or else in any combination with each other in the dishwasher according to the invention for use.

The invention, their training and further developments and their advantages will be explained below with reference to drawings.

Figur 1

eine schematisierte räumliche Darstellung eines vorteilhaften Ausführungsbeispiels einer erfindungsgemäßen Geschirrspülmaschine;

Figur 2

ein Blockschaltbild der Geschirrspülmaschine von Figur 1;

Figur 3

ein Funktionsdiagramm eines ersten Spülprogramms der Ge- schirrspülmaschine der Figur 2;

Figur 4

ein Funktionsdiagramm eines zweiten Spülprogramms der Ge- schirrspülmaschine der Figur 2;

Figur 5

ein Blockschaltbild eines weiteren vorteilhaften Ausführungsbei- spiels einer erfindungsgemäßen Geschirrspülmaschine;

Figur 6

ein Funktionsdiagramm eines ersten Spülprogramms der Ge- schirrspülmaschine der Figur 5;

Figur 7

ein Funktionsdiagramm eines zweiten Spülprogramms der Ge- schirrspülmaschine der Figur 5.

Show it:

FIG. 1

a schematic spatial representation of an advantageous embodiment of a dishwasher according to the invention;

FIG. 2

a block diagram of the dishwasher of FIG. 1 ;

FIG. 3

a functional diagram of a first washing program of the dishwasher of the FIG. 2 ;

FIG. 4

a functional diagram of a second washing program of the dishwasher of the FIG. 2 ;

FIG. 5

a block diagram of a further advantageous embodiment of a dishwashing machine according to the invention;

FIG. 6

a functional diagram of a first washing program of the dishwasher of the FIG. 5 ;

FIG. 7

a functional diagram of a second washing program of the dishwasher of the FIG. 5 ,

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 a schematic spatial representation of an advantageous embodiment of a dishwasher according to the invention 1. This has a washing container 2, which can be closed by a door 3, so that a rinsing cell for rinsing dishes. The rinsing container 2 is arranged in the interior of a housing 4 of the dishwasher 1, which has standard dimensions. Thus, the housing 4, for example, have a width of 45 cm or 60 cm, which allows integration of the dishwasher 1 in a standard designed kitchenette with a corresponding Einbaunische. In particular, the housing 4 can also be omitted, so that the dishwasher is better designed for installation in niches such as in kitchen cabinets built-in.

On the back of the dishwasher 1, a schematically illustrated water inlet device 5 is arranged. This has a hot water inlet 6, 7 and a cold water inlet 8, 9, wherein the hot water inlet 6, 7 for receiving hot water from an external hot water supply WH and the cold water inlet 8, 9 is provided for receiving cold water from an external cold water supply KH.

Here, the hot water inlet 6, 7 comprises a controllable hot water valve 6 and the cold water inlet 8, 9 a controllable cold water valve 8. The hot water valve 6 and cold water valve 8 are basically constructed identically. For example, both valves 6, 8 may be formed as a solenoid valve. The inlet sides of the valves 6, 8 are each formed so that they can be attached to fittings WH, KH a household water supply, for example, to faucets WH, KH, can be attached. The connection can be made in each case by means of a screw connection, a snap connection or the like. Such valves 6, 8 are in particular formed as a water stop or Aquastop valves 6, 8. Advantageously, these are closed when they are not activated, so that the dishwasher 1 is disconnected from the water supply in the off state. In this way, leakage of leakage water from the switched-off dishwasher 1 can be avoided in the event of a fault.

Intended are in FIG. 1 the input side of the hot water valve 6 to a hot water tap WH and the input side of the cold water valve 8 connected to a cold water tap KH. The output side of the hot water valve 6 is connected to a hot water hose 7 and the output side of the cold water valve 8 with a cold water hose 9, wherein the downstream ends of the hot water hose 7 and the cold water hose 9 are connected to an input side of a connecting piece 10. At its output side, a common inlet hose 11 connects for hot water and cold water, which in turn is connected to a connector 12 on the housing 4 of the dishwasher 1. By means of the water inlet device 5, it is therefore possible, hot water from an external hot water supply WH and / or cold water from an external cold water supply KH individually controlled to lead into the interior of the dishwasher 1. Of course, it is also possible to provide the common connector 10 on the device side as an attachment or built-in part, so that the hot water hose 7 and the cold water hose 9 are guided to the dishwasher.

The hot water hose 7, the cold water hose 9 and / or the common inlet hose 11 may be formed as safety hoses with an inner water-carrying pressure hose and an outer Hüllschlauch, wherein between the pressure hose and Hüllschlauch each a leakage water channel for discharging any leak water may be provided. In this case, the connecting piece 10 may be formed so that the leak water channels of the hot water hose 7, the cold water hose 9 and the common inlet hose 11 are interconnected, so that leakage water, which occurs during operation of the dishwasher 1 in the water supply device 5, via the housing-fixed connector 12 is directed into the interior of the dishwasher 1. Here it can be detected by a leak water sensor, not shown, so that appropriate measures, such as closing the hot water valve 6 and 8 cold water valve, can be initiated by the flow control device of the dishwasher.

Downstream of the housing-fixed connection piece 12, a free flow path 13 is provided. In the free flow path 13 is a so-called pipe interruption, which serves to prevent a sucking back of water from the dishwasher 1, if in the external water supply by dynamic processes, a negative pressure. This prevents in particular that already used water, which may be mixed with dirt, cleaning agents and / or cleaning aids, can get back into the building water supply

Furthermore, the dishwasher 1 in the FIG. 1 not shown, which connect the free flow path 13 with the washing container 2 so that it can be filled with cold water from the cold water supply KH and / or hot water from the hot water supply WH.

In a lower region of the washing container 2, a pump pot 16 is provided in which a circulating pump is suitably provided for circulating water in the washing container 2 during a wash cycle. In this case, the circulation pump may have a heating device for heating the water located in the washing container 2, for example a water heater. Likewise, in the sump 16, a pump for pumping out water, for example at the end of a rinse cycle, be provided. However, the various pumping functions can also be perceived by a single pump in conjunction with switchable valves. The sump 16 is usually connected to a waste water connection piece 17 via means not shown so that water from the washing compartment 2 via a connected to the waste water connection piece 17 sewage hose 18 in a building side installed wastewater A, such as a sewer pipe A, can be pumped.

The dishwasher 1 also has a flow control device 19 for controlling the course of a washing program. In the sequence control device 19, various rinse programs can be stored, which can be selected by an operator. The flow control device 19 is arranged inside the door 3 of the washing container 2, but could also be arranged elsewhere in the dishwasher 1. Furthermore, the dishwasher 1 has a sorption drying device 20 which is arranged on a side wall of the washing container, here in the exemplary embodiment in particular between the washing container 2 and the housing 4. Alternatively, however, most of the components of the sorption desiccant device 20, such as e.g. their fan unit or blower 25, the sorption 30, in particular sorption, housed in a floor assembly below the washing.

FIG. 2 shows a functional diagram of the dishwasher of FIG. 1 , The hot water valve 6 and the cold water valve 8 are each connected to the flow control device 19, that both are individually or specifically controlled. Downstream of the free flow path 13, an inlet 21 for charging the washing container 2 with water from the inlet device 5 is arranged. This makes it possible, the washing container 2 via the connecting piece 10, the free flow path 13 and the inlet 21 to fill depending on the selected wash program with hot water and / or cold water.

In the sump 16 of the washing compartment 2, a circulation pump 22 designed as a heating pump is arranged, which is in communication with a spray system 23 arranged in the interior of the washing compartment 2. This makes it possible to apply in the washing container 2 arranged items to be washed during a wash with water to clean this. Furthermore, a drain pump 24 is arranged in the sump, which makes it possible to pump out no longer needed water to the outside. In the case of the heating pump, both the heating function and the pumping function can be individually controlled by the sequence control device 19. Furthermore, the flow control device 19 is also connected to the drain pump 24 for the control thereof. Of course, it is alternatively also possible to provide an electric heating device in the liquid circulating system of the dishwasher separately from the circulating pump.

The sorption drying device 20 has an air guidance system 25, 26, 28, which comprises a fan 25, a suction-side air line 26 and a pressure-side air line 28. The blower 25 is connected via the suction-side air line 26 to an air outlet 27 of the washing container 2 and via the pressure-side air line 28 to an air inlet 29 of the washing container 2.

During a drying step of a washing program, an air flow LS can thus be generated, which is guided by a sorption device 30 arranged in the pressure-side air line 28. The sorption device 30 could also be arranged in the suction-side air line 26. It contains a reversibly dehydratable material 31, which sorbs moisture in the air flow LS, which originates from the washing container 2, during the drying step. As a result, the air flow LS is dried, which then, when it is returned to the washing, can absorb more moisture, resulting in a drying of items to be washed in the washing.

In order to desorb the sorption, a preferably electric heater 32 is provided, which has a heating element, which in the Air control system 25, 26, 28 is arranged to heat the sorption 30. The reversibly dehydratable material is heated to very high temperatures, for example to 300 ° C. A portion of the heat typically generated by the electric heater 32 is used to overcome the bonding forces between the sorbed medium and the reversibly dehydratable material 31. However, the other part is introduced in the form of waste heat with the air flow LS in the washing compartment 2. It is provided to use the heat generated during a desorption of the sorption waste heat to heat at least the water required for a caused by a program step partial rinse for rinsing items to be washed.

The control of the water inlet device 5, the heating pump 22, the drain pump 24, the Sorptionsstrockenvorrichtung 20 and other not explained here devices of the dishwasher 1 is carried out in response to a selected wash program, which is stored in the flow control device 19. In this case, the dishwasher 1 is provided at least one washing program, which is specifically selected for the efficient use of hot water from the hot water supply WH and cold water from the cold water supply KH. This means, in particular, that cold water is required for such a partial wash cycle, for which cold water is required or required, and for such a partial wash cycle, for which hot water is required, hot water is supplied specifically.

FIG. 3 shows a functional diagram for explaining the function of the dishwasher 1 of the invention FIGS. 1 and 2 , For this purpose, the course of a wash program SP is shown, which is intended to control a sequence of a wash cycle so that an efficient use of hot water from the hot water supply WH and cold water from the cold water supply KH is ensured.

In FIG. 3 the curves SWV, SKV, BGE and BHZ are shown on a common time axis t, which indicate switching or operating states of components of the dishwasher 1 on the vertical axis Z.

The curve SWV represents the switching state of the hot water valve 6 of the dishwasher 1. Furthermore, the curve SKV shows the switching state of the cold water valve 8 of the dishwasher 1. The switching state "0" corresponds in each case a closed valve 6, 8, the switching state "1" an open Valve 6, 8. The curve BGE also represents the operating state of the blower 25, wherein the off state is symbolized by "0" and the on state by "1". Finally, the curve BHZ shows the operating state of the heating device 32 of the sorption drying device 20. Again, the off state is indicated by "0" and the on state by "1".

In FIG. 3 an irrigation program SP is shown by way of example which comprises a pre-rinsing step VS, a cleaning step RS, an intermediate rinsing step ZS and a rinsing step KS for rinsing items to be washed using water in this order. These program steps are converted into corresponding liquid-carrying partial rinses, ie with each program step of a selected dishwasher program is accompanied by a Teilspülgang. This is followed by a drying step TS for drying the cleaned items in a drying cycle. Partial rinses can thus be both liquid-carrying partial rinses as well as drying cycles. In other examples, one or more of these steps might be hidden. Also examples would be possible in which one or more steps are repeated several times. In addition, a desorption DS of the sorption device 30 is provided, which is tuned in time to the program steps already mentioned.

The first pre-rinsing step VS serves to remove coarse contaminants from the dishes so as to prepare the cleaning step RS. For this purpose, the hot water valve 6 is opened at the beginning of Vorspülschritts VS, so that hot water from the hot water supply WH via the inlet 21 into the washing container 2 passes. When the washing container 2 is charged with a sufficient amount of hot water from the hot water supply WH for the pre-washing step VS, the hot water valve 6 is closed again. The hot water is in the washing container 2 by means of the heating pump 22 for a predetermined time, usually without - in exceptional cases with connection - their heating device, circulated so as to wash the dishes with hot water having a desired target temperature, to act on. Thereafter, the now polluted hot water is pumped out by means of the drain pump 24 to the outside.

Alternatively, cold water from the cold water supply KH could be wholly or partially used during the pre-rinse step VS. This would lead to energy savings, but the pre-rinsing time would normally have to be increased in comparison with the above case of pre-rinsing with hot water, in order to achieve a predetermined cleaning effect.

The subsequent cleaning step RS is used to thoroughly clean the dishes. At the same time, a desorption DS of the sorption device 30 is carried out in order to remove water which has accumulated on the reversibly dehydratable material 31 in a drying step of a previously performed rinse cycle. For this purpose, on the one hand the fan 25 and on the other hand, the heater 32 of the Sorptionstrockeneinrichtung 20 is turned on. In this way, the air flow LS, the waste heat of desorption DS is transported to the washing. The fan 25 and the heater 32 are usually turned off when the reversibly dehydratable material 31 is substantially freed from the sorbed water. This time can be reached before the completion of the cleaning step RS.

During the cleaning step RS, it is usually necessary to apply water to the wash ware, which has a comparatively high temperature in order to achieve a high thermal cleaning effect. In addition, water is generally added to the detergent whose chemical cleaning action is best at a higher temperature. Usually, therefore, a target temperature of about 50 ° C to 70 ° C is provided for a cleaning step RS. Due to the introduced by the air flow LS in the washing 2 waste heat, this temperature can be easily achieved without switching the arranged in the sump 16 flow heater of the heating pump 22, even if at the beginning of the cleaning step low-temperature water is introduced into the washing compartment 2. Therefore, it is provided to perform the cleaning step RS using cold water from the cold water supply KH. For this purpose, the cold water valve 8 is temporarily opened at the beginning of the cleaning step RS. The filled in the washing container 2 cold water is now circulated by means of the circulation pump 22 for a predetermined time. In this case, the cold water is increasingly heated by the waste heat of desorption DS, so that the desired temperature for the cleaning step is achieved.

In this way, the cleaning step RS can be carried out particularly efficiently. Thus, a high saving of electrical energy can be achieved here, since the cold water from the cold water supply KH usually not at all, in rare cases only to a small extent, must be reheated by the electric heating pump 22 of the dishwasher 1 to the desired temperature to reach. In addition, a removal of heat energy from the hot water supply WH is not required.

Another advantage of the use of cold water from the cold water supply KH during the cleaning step RS, results from the fact that when using cold water from the cold water supply KH compared to a use of hot water from a hot water supply WH at least at the beginning of desorption DS in the washing 2 sets a lower temperature level. As a result, more waste heat can be absorbed by the water provided for rinsing, which is generated during the desorption DS. The air flow LS, which is guided in a circuit of the sorption 30 into the washing compartment 2 and from the washing tank 2 back to the sorption 30, therefore cools more in the washing compartment 2 and thus has a lower temperature when he the sorption 30 again reached. In this way, overheating of the reversibly dehydratable material 31 can be prevented.

Possibly. the device-internal heating device for Spülflottenflüssigkeitserwärmung even completely omitted if the waste heat from the respective desorption of Sorptionstrockenvorrichtung and / or the heat energy of the supplied hot water supply from the external hot water supply to heat the required for each Teilspülgang Spülbadmenge to a certain target temperature.

At the conclusion of the cleaning step RS, the now polluted hot water is pumped out by means of the drain pump 24 (not shown) to the outside.

The now performed intermediate rinse ZS for removing detergent from the items to be washed after the cleaning step RS, however, provides a feed of the rinse tank 2 with hot water from the hot water supply WH, to be able to apply hot water to the ware can. For this purpose, the hot water valve 6 is first opened until the washing container 2 is charged with a sufficient amount of hot water for the intermediate rinse ZS. This hot water is circulated by means of the circulation pump 22 for a predetermined time, which usually can be omitted switching on their heating or more generally the heating of the liquid circulation system. Thereafter, the now polluted hot water is pumped out by means of the drain pump 24 to the outside.

Alternatively, cold water from the cold water supply KH could be wholly or partially used during the intermediate rinse step ZS. This would lead to an energy saving, but the intermediate purging time would normally have to be extended in order to achieve a predetermined cleaning effect.

The rinse step KS which now follows serves, in particular, to prevent stains on the items to be washed, which could be caused by dissolved substances in the water, such as, for example, salt and / or lime. For this purpose, the water is added during the rinse step KS with rinse aid. In a dishwasher 1 with a sorption drying device 20, it is generally not necessary to heat the dishes to a higher temperature during the final rinse step KS. Because the drying of the dishes can be effected solely by means of the sorption of the sorbent in the sorption 30 Therefore cold water from the cold water supply KH can be used without this would have to be heated by higher energy use of electrical energy by means of the heating of the circulation pump 22. At the same time, the amount of heat removed from the hot water supply WH can be reduced, and yet a sufficient drying result can be achieved within a reasonable time.

Therefore, in the final rinse step KS, first the cold water valve 8 is opened until the rinsing tank 2 is charged with a sufficient amount of cold water for the final rinse step ZS. This cold water is circulated by means of the circulating pump 22 for a predetermined time, which as a rule can be omitted switching on their associated heating device. At the end of the rinse step KS the now polluted water is pumped out by means of the drain pump 24 to the outside.

During the final drying step TS, a feeding of the washing container 2 with water is not provided. Rather, the now cleaned items to be washed by the fan 25 is turned on and thus the air flow LS is generated. This takes up moisture in the washing container 2, which is then deposited in the reversibly dehydratable material 31.

FIG. 4 shows a further rinse program SSP, which for rinsing items to be washed using water in this order comprises a pre-rinse step VS, a cleaning step RS, an intermediate rinse step ZS and a rinse step KS '. Here too, a rinse-closing drying step TS 'follows to dry the cleaned items to be washed. The rinse program SSP is a rapid rinse program SSP with a shortened running time, whereby the shortening by one compared to the washing program SP of the FIG. 3 modified rinse step KS 'and a shortened drying step TS' is effected.

In contrast to the above-described wash program SP hot water from the hot water supply WH is used here during the rinse step, so that the dishes are heated. As a result, in the subsequent drying step TS 'the evaporation of water drops adhering to the hot dishes is accelerated, so that a predetermined drying result can be achieved in a shorter time.

When using hot water from the hot water supply WH for the final rinse step KS 'is also ensured that the heat energy withdrawn from the hot water supply WH is used meaningfully. Again, a high saving of electrical energy can be achieved because the hot water from the Hot water supply WH in many cases not at all, in other cases only to a small extent, must be reheated by the electric heater of the liquid circulation system of the dishwasher 1 in order to achieve the required for the final rinse KS 'temperature.

FIG. 5 shows a block diagram of another embodiment of a dishwasher according to the invention. This has a modified Sorptionsstrockenvorrichtung 20 '. In contrast to the embodiment described above, the sorption device 30 is arranged so that it does not flow through the air flow LS, but is flowed around. Furthermore, a container 33 is provided, which is connected to the sorption device 30 for exchanging a medium sorbable by the sorption device 30. The container 33 is also thermally conductively connected to a condensation surface 35, which is arranged in the washing compartment. However, it could also be arranged in the air guidance system 25, 26, 28. Container 33 and sorption device 30 are connected via a valve 36, which is controlled by the sequence control device 19 as a function of the respectively selected washing program.

FIG. 6 shows a washing program SP 'for the dishwasher 1 of FIG. 5 , It essentially corresponds to the washing program SP of FIG. 2 However, the additionally shown curve SVE shows the switching state of the valve 36. At the beginning of desorption during the cleaning step RS, therefore, the valve 36 is opened. As a result, the medium 34 desorbed by the reversibly dehydratable material 31 passes into the container 33, where it liquefies and thus gives off heat to the condensation surface 35. The condensation surface 35 releases at least some of this heat to the water in the washing container 2. At the same time as in the previous embodiment, heat is introduced through the air flow LS in the washing, so that the cold water located there is heated by the cold water supply KH. After completion of the desorption, the valve 36 is closed, so that the sorbable medium 34 is enclosed in the container 33.

During the drying step TS, the valve 36 is opened again. As a result, the sorbable medium 34 evaporates, so that the condensation surface 35 is cooled which promotes condensation of water vapor in the purge vessel, resulting in an improved drying effect.

FIG. 7 shows a quick wash program SSP 'for the dishwasher of the FIG. 5 which essentially corresponds to the rapid rinsing program SSP of FIG. 4 equivalent. In addition, however, the switching state SVE of the valve 36 is shown.

The invention relates according to an advantageous embodiment, a dishwasher, in particular domestic dishwasher, with an adsorption drying system, which with an external hot water connection, in particular hot water solar connection, and a cold water connection, i. a bithermal water connection device. These two water connections can be controlled separately with one Aquastop valve each. The hot water connection is provided for the purchase of hot water from an external hot water supply device, in particular the purchase of warm, inexpensive solar water of a fully or partially operated by a solar thermal system hot water supply system, the other water connection for cold water from the mains. Both water connections can be individually selected via a control of the dishwasher.

The dishwasher is equipped with an adsorption drying system, whereby the control unit has special programs designed for this purpose. If the customer chooses a special function, the machine can react to it.

In particular, a rinsing program with a normal program running time, ie normal program, can be provided in which hot water from a solar-powered or solar-assisted hot water supply system is used for pre-rinsing and intermediate rinsing. By contrast, in this rinsing program, for the purpose of cleaning, it is preferable to use cold water from a cold water supply in order to preserve the sorption material, in particular zeolite, of the sorption device. Due to the drying system, no higher temperature is required for rinsing in order to achieve a very good drying effect with normal running time. Therefore, cold water from a cold water supply is used for rinsing.

Additionally or independently thereof, a program with a shortened running time can be provided in which hot water from a solar system is used in contrast to the program for the rinse cycle described above. If the user selects this quick program, the result is a clear shortening of the drying time with a constant drying effect compared to the normal program. Because now, in addition, the self-heat drying of the dishes can be used.

The use of cold water during the desorption phase produces the lowest possible starting temperature level. This leads to a sparing of the technical materials in the adsorption drying system. After the desorption phase, the cost-effective hot water from the hot water solar system can be used again. This results in a higher entry of the temperature level during rinsing and thus a shorter drying time.

Overall, there is an effective use of hot water and energy savings and a material protection in the adsorption drying system in conjunction with a hot water reference, in particular a hot water solar system.

LIST OF REFERENCE NUMBERS

1

dishwasher

2

rinse tank

3

door

4

casing

5

Water inlet device

6

Hot water valve

7

Hot water hose

8th

Cold water valve

9

Cold water hose

10

joint

11

inlet hose

12

fixed housing

13

free flow path

16

sump

17

Sewage fitting

18

drain hose

19

A sequence controller

20

sorption

21

inflow device

22

Circulation pump with instantaneous water heater

23

spraying

24

Lye pump, sewage pump

25

fan

26

suction-side air line

27

air outlet

28

pressure-side air line

29

air intake

30

sorption

31

reversibly dehydratable material

32

heater

33

container

34

sorbable medium

35

condensing surface

36

Valve

A

sewage pipe

KH

Cold water supply, cold water tap

WH

Hot water supply, hot water tap

LS

airflow

SWV

Switching state of the hot water valve

SKV

Switching state of the cold water valve

BGE

Operating condition of the blower

BHZ

Operating status of the heater

SP

washing program

VS

pre-wash

RS

cleaning step

ZS

intermediate rinsing

KS

rinsing step

TS

drying step

DS

desorption

SSP

Schnellspülprogramm

SVE

Switching state of the valve

Claims (14)

1. Dishwasher, in particular domestic dishwasher (1), with a sequence control device (19), in which one or more wash programs (SP, SSP) are deposited for controlling at least one wash cycle for cleaning items to be washed, with a washing container (2) for receiving items to be washed during the rinse and with a Sorptionsstrockenvorrichtung (20) having a sorption (30) with a reversibly dehydratable material (31), characterized in that a water inlet device (5) is provided, which a hot water inlet (6, 7) and a cold water inlet (8, 9), wherein the hot water inlet (6, 7) for receiving hot water from an external hot water supply (WH) and the cold water inlet (8, 9) for receiving cold water from an external cold water supply (KH) is provided wherein at least one of the wash programs (SP, SSP) at least one program step (VS, ZS, VS, ZS, KS ') for washing items to be washed un ter use of hot water from the hot water supply (WH) and at least one program step (RS) for rinsing items to be washed using cold water from the cold water supply (KH) is provided. 2. Dishwasher according to claim 1, characterized in that at least one program step (RS), is provided for the rinsing of items to be washed cold water from the cold water supply (KH), the cold water is heated by means of waste heat, which at a desorption (DS) of Sorption device (30) is formed. 3. Dishwasher according to one of claims 1 or 2, characterized in that the Sorptionstrockenvorrichtung (20) has an air guide system (25, 26, 28) for generating an air flow (LS) of the sorption (30) in the washing compartment (2), wherein at least one of the rinsing programs (SP; SSP) is provided to generate the air flow (LS) during the desorption (DS) of the sorption device (30) so as to rinse washware provided cold water from the cold water supply (KH) by means of waste heat Heat, which arises during desorption (DS). 4. Dishwasher according to one of the preceding claims, characterized in that at least one of the rinse programs (SP, SSP) at least one cleaning step (RS) for rinsing ware provides, in which an application of ware with cold water from the cold water supply (KH), which is heated by means of the desorption (DS) resulting waste heat takes place. 5. Dishwasher according to one of the preceding claims, characterized in that at least one of the washing programs (SP; SSP) provides a pre-rinsing step (VS) for rinsing items to be washed, in the preparation of a cleaning step (RS) an application of items to be washed with hot water from the Hot water supply (WH) takes place. 6. Dishwasher according to one of the preceding claims, characterized in that at least one of the washing programs (SP; SSP) provides an intermediate rinsing step (ZS) for rinsing items to be cleaned, wherein for removing detergent from the items to be washed after a cleaning step (RS) an admission of Washware with hot water from the hot water supply (WH) takes place. 7. Dishwasher according to one of the preceding claims, characterized in that at least one of the washing programs (SP) provides a rinse step (KS) for rinsing items to be washed in which a loading of items to be washed with cold water from the cold water supply (KH). 8. Dishwasher according to one of the preceding claims, characterized in that at least one of the washing programs (SSP) provides a rinse step (KS ') for rinsing items to be washed in which a loading of items to be washed with hot water from the hot water supply (WH). 9. Dishwasher according to one of the preceding claims, characterized in that the hot water inlet (6, 7) and / or the cold water inlet (8, 9) is associated with a free flow path (13). 10. Dishwasher according to one of the preceding claims, characterized in that the hot water inlet (6, 7) a hot water valve (6) and the cold water inlet (8, 9) comprises a cold water valve (8), wherein the hot water valve (6) and the cold water valve ( 8) are independently controllable by the flow control device (19). 11. Dishwasher according to one of the preceding claims, characterized in that the hot water valve (6) at an upstream end of a hot water hose (7) is arranged and adapted to be attached to a fitting (WH) of the external hot water supply (WH), and / or that the cold water valve (8) is arranged at an upstream end of a cold water hose (9) and adapted to be fastened to a connection piece (KH) of the external cold water supply (KH). 12. Dishwasher according to one of the preceding claims, characterized in that a downstream end of the hot water hose (7) and a downstream end of the cold water hose (9) via a connecting piece (10) are liquid-conductively connected to a supply hose (11) which is fixed to the housing Connecting piece (12) of the dishwasher (1) is connected. 13. Method for controlling at least one rinse cycle for cleaning items to be washed by means of one or more rinse programs (SP, SSP) which are stored in the sequence control device (19) of a dishwasher, in particular domestic dishwasher (1), the dishwasher comprising a rinse container (2) for receiving items to be cleaned during the wash cycle and a Sorptionstrockenvorrichtung (20) comprising a sorption (30) with a reversibly dehydratable material (31), in particular according to at least one of the preceding Claims, characterized in that in at least one of the wash programs (SP; SSP) of at least one program step (VS, ZS; VS, ZS, KS ') for washing wash ware hot water from an external hot water supply (WH) and at least one program step ( RS) is used for rinsing ware cold water from the cold water supply (KH). 14. The method according to claim 13, characterized in that in a program step (RS), is provided for the rinsing of items to be washed cold water from the cold water supply (KH), the cold water is heated by means of waste heat, which at a desorption (DS) of the sorption (30) arises.

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