EP2440104B1 - Dishwasher having two water connections and control method - Google Patents

Description

The present invention relates to a dishwasher, in particular a domestic dishwasher, with a hot water supply device for the intake of hot water from an external hot water supply, with a cold water supply device for the intake of cold water from an external cold water supply, and with a sequence control device for controlling a wash cycle of a selected dishwasher program for cleaning items to be washed.

In modern dishwashers, the items to be washed, in particular items to be washed, are introduced into a washing container and are cleaned there with the aid of water in a washing process, which is also called a washing cycle, and then dried. The respective rinse cycle can in particular comprise one or more partial rinse cycles or rinse cycle steps. The aim is to carry out a rinse cycle so that a predefined cleaning result and a predefined drying result are achieved as efficiently as possible. A high overall efficiency is required, which results from the cleaning efficiency and the drying efficiency. The cleaning efficiency corresponds to the ratio of the cleaning result achieved by means of a rinse cycle and the effort required for this, the effort being able to comprise several dimensions, for example the energy requirement, the water requirement and / or the time requirement. Furthermore, the drying efficiency corresponds to the ratio of the drying result achieved by means of a rinse cycle and the effort required for this, the effort here also comprising several dimensions, for example the energy requirement and / or the time requirement.

In the case of a dishwasher, a sequence control device is generally provided, in which one or more wash programs for controlling at least one wash cycle for cleaning items to be washed are stored. The sequence control device is designed such that it automatically controls a rinse cycle according to a rinse program that is usually selected by an operator. In known dishwashers, the water required to carry out rinse cycles can be supplied via a Water inlet device are included, which can absorb water, for example, from a water supply installed on the building.

To carry out a wash cycle, a wash program preferably has a number of successive program steps for treating the washware, the water in the water-carrying program steps being provided with cleaning agents and / or additives depending on the respective program step and being brought to a temperature which is favorable for the respective program step . In order to be able to provide the water provided for rinsing with the intended cleaning agents and / or additives, modern dishwashers usually have automatic metering devices. Furthermore, dishwashers can have a usually electrical heating device in order to bring the water provided for washing up to the required temperatures.

A typical rinsing program for cleaning the wash ware in this chronological order includes in particular a pre-rinse step to carry out a pre-rinse cycle, a cleaning step to carry out a cleaning cycle, an intermediate rinse step to carry out an intermediate rinse cycle, and a rinse cycle to carry out a rinse cycle, in which the wash ware are each washed with water or Rinsing liquor liquid is applied. However, rinse programs can also be provided in which one or more of these program steps are hidden. Rinse programs are also possible in which one or more of these program steps are run through several times. Furthermore, a typical washing program comprises a drying cycle following the last water-carrying partial washing cycle, which is implemented by a corresponding drying step of the selected dishwashing program, for drying the cleaned washware.

A pre-rinse step is primarily used to remove coarser soiling from the dishes. The purpose of a subsequent cleaning step is to completely remove dirt from the wash ware. An intermediate rinsing step which has now been carried out serves in particular to remove residues of cleaning agent which adhere to the items to be washed. A subsequent rinse step is in particular to avoid stains on the wash ware caused by dissolved substances in the water, such as for example salt and / or lime, could be provided. To do this, rinse aid is added to the water during the rinse step.

In a dishwasher with so-called self-drying, a further task of the final rinse 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 subsequent drying step, water drops adhering to the hot wash items evaporate and are knocked off on the inside of the wash container due to the lower temperature prevailing there.

From the DE 100 46 347 A1 is a water supply device for household appliances such as. B. a dishwasher is known, which comprises a cold water valve and a hot water valve. Both the cold water valve and the hot water valve can be opened or closed by means of a control device depending on an operating program. Downstream of the cold water valve and downstream of the hot water valve, a water supply hose is arranged, which opens into a branch. The only outlet of the branch is connected to a water inlet of the dishwasher that is fixed to the housing. In this way, the hot water required by the dishwasher can be taken from a hot water supply line, the water of which is heated by a domestic heating system.

The DE 100 57 263 A1 mentions a hot water supply for a household appliance, which has solar panels for hot water preparation.

There is no question that the use of hot water from a household heating system can lead to a saving in electrical energy, since in this case the energy requirement of an electrical heater of the dishwasher can be reduced. Against the background of generally increasing operating costs of household heating systems, the additional costs for operating the household heating system generated by taking hot water from the domestic hot water supply line in many cases exceed the saved costs for electricity.

The object of the present invention is to provide a dishwasher which causes lower energy costs in operation.

The object is achieved by the following dishwasher, in particular household dishwasher, according to the invention: dishwasher, in particular household dishwasher, with a hot water supply device for the entry of hot water from an external hot water supply, with a cold water supply device for the entry of cold water from an external cold water supply, and with a sequence control device for controlling a rinse cycle a selected dishwashing program for cleaning items to be washed, the sequence control device having a first operating mode in which at least one washing program can be called up, which specifically provides for hot water from the external hot water supply in at least one partial wash cycle, and wherein the sequence control device has a second operating mode , in which at least one wash program can be called up, which starts from at least one partial wash cycle finally, specifically provides for a supply of cold water from the external cold water supply, and the sequence control device being designed and coupled to the hot water supply device and the cold water supply device such that in the first operating mode for a first group of one or more partial wash cycles of the wash cycle carried out by a selected dishwashing program, for which a specific rinse bath hot water temperature greater than the cold water temperature of the cold water of the external cold water supply is required, hot water from the external hot water supply can be fed into the rinse tank specifically for the partial wash cycle using the hot water supply device, and for a second group of one or more partial rinse cycles of the selected wash cycle Dishwashing program, for each of the specific rinse bath hot water temperature the cold water temperature of the cold water of the external cold water server is sufficient or required, cold water from the external cold water supply can be fed into the rinsing container by means of the cold water supply device in a partial rinse cycle, an externally available heat exchanger, in particular in the form of a water pocket or a storage container, which is attached to a wall, in particular the side wall, of the rinsing container in a heat-transferring manner, at the end of the rinse cycle and / or at the beginning of the subsequent drying cycle of the rinse cycle with cold water from the external Cold water supply device is filled, and that in the event that hot water from the external hot water supply is used for all water-carrying partial rinse cycles of the wash cycle carried out by a selected dishwasher program, the heat exchanger is not filled with hot water at the end of the final rinse cycle, but during the duration of the drying cycle of this rinse cycle remains empty.

This makes it possible to provide a dishwasher with improved energy efficiency.

According to the hot water supply for receiving hot water from an external hot water supply. This can in particular be at least partially fed by a thermal solar system. A thermal solar system is a technical system for converting solar energy into usable thermal energy. Thermal solar systems usually provide hot water in a temperature range of, for example, 40 ° C to 70 ° C, which makes it possible to use the hot water directly for heating the building but also as process water. Thermal solar systems usually comprise a large number of solar collectors which have an absorber surface which is heated by the electromagnetic solar radiation. From there, the heat can be transported by means of a fluid to a heat exchanger, which z. B. generated in a buffer memory that is filled with water.

In favorable conditions, even in temperate climates, the heating water requirement of a household can be covered with collector areas of a few square meters. The generation costs for the thermal energy obtained are extremely low. However, in many places, for example in Central Europe, in the winter months, in summer bad weather periods or when there is a high demand for hot water, the performance of the solar panels is not sufficient. In many cases, solar systems therefore have conventional additional heating, for example gas or oil heating, in order to have enough hot water available even in such a situation. However, if the additional heating has to be used, the production costs for the hot water provided generally rise. In particular, instead of or in addition to the thermal solar system for the provision of an inexpensive Hot water supply in the household a modern condensing heating system such as a pellet stove, wood chip or wood log heating, a combined heat and power system, geothermal heat pump heating, air heat pump system, a district heating system or a local heating system, individually or in any combination, etc. may be more appropriate. In particular, the combination of, for example, a pellet stove with a thermal solar system can be energetically advantageous. Other hot water supply systems that do not require or only have a relatively low primary energy requirement for fossil fuel carriers and / or only use largely CO ₂ -neutral or reduced energy sources are also energetically favorable. The explanations given in the case of a solar-thermal hot water production system apply analogously to the design and control of the dishwasher according to the invention in the presence or presence of another - including conventional hot water supply system.

The dishwasher according to the invention thus advantageously enables the efficient use of hot water from an external hot water supply system, in particular of hot water produced inexpensively by means of a solar system.

For this purpose, the sequence control device has a first operating mode in which at least one wash program can be called up, which provides for the use of hot water from the hot water supply in one wash cycle, and wherein the sequence control device has a second operating mode in which at least one wash program can be called up which Rinse cycle only allows the use of cold water from the cold water supply. The first operating mode is therefore a hot water operation, in which at least partial hot water from the, in particular solar-thermal operated or supported, external hot water supply system is used for a rinse cycle, while the second operating mode is a pure cold water operation, for which a rinse cycle uses only cold water from the external cold water supply system.

The first mode of operation enables washing cycles to be carried out efficiently if the cost savings due to the reduction in the internal heating requirements of the dishwasher are greater than the additional costs of operating the external ones Hot water supply system, which arise from the withdrawal of hot water. On the other hand, the second mode of operation enables washing cycles to be carried out efficiently if the cost savings due to the reduction in the internal heating requirements of the dishwasher are less than the additional costs of operating the hot water supply which arise from the removal of hot water.

It is possible, for example, to adapt the course of rinse cycles to the heat output provided by the external hot water supply or hot water supply system, in particular to the output generated by the solar collectors, without changing the building-side installation or the connection of the dishwasher to the building-side installation would be required. In particular, it is not necessary to change the connection hoses of the dishwasher with the connections on the building side, depending on the request for hot water or cold water, i.e. to connect or separate them. This is because the dishwasher designed according to the invention now has, in particular, a first connection hose for drawing off hot water and a second connection hose for cold water, i.e. it is equipped with a bithermal water connection device. In particular, the two connection hoses of this bithermal water connection device can remain permanently connected to the hot water connection of the external hot water supply and the cold water connection of the external cold water supply without changing the connection assignment.

If the external hot water supply system, in particular the solar collectors, provides an excess of heat based on the other needs of the household, this excess heat can be used in a simple manner to reduce the internal energy requirement of the dishwasher by selecting the first operating mode. If the external hot water supply system, in particular the solar collectors, does not provide enough heat in relation to the heat requirement of the household, then by selecting the second operating mode, it can be prevented that heat is withdrawn from the hot water supply, which is generated by heating with the additional heater, which is usually more expensive Hot water supply system would have to be compensated.

The rinsing programs that can be called up when the first operating mode is selected are especially adapted to the use of hot water from the external hot water supply system, in particular the thermal solar system, with regard to their chronological sequence. Similarly, the wash programs that can be called up when the second operating mode is selected are especially adapted to the use of cold water with regard to their chronological sequence. In both cases, a predetermined cleaning effect or drying effect can be achieved with high efficiency.

Corresponding washing programs can be provided in the first operating mode and in the second operating mode, which are largely the same, in particular, due to an essentially identical cleaning action and / or drying action. For example, corresponding normal washing programs, corresponding intensive programs, corresponding gentle programs or corresponding automatic programs can be provided. The corresponding programs can alternatively or additionally be designed as quick-wash programs.

According to the invention, at least one washing program can be called up in the first operating mode, which provides at least one program step for washing dishes to be washed using hot water from the hot water supply.

If, due to its nature, a program step requires the use of water at a high temperature or at least makes it desirable, hot water from the external water supply system can be taken up for this program step in the first operating mode. Such a program step for washing items to be washed can be, in particular, a cleaning step and / or a rinse-aid step, since it is generally provided there that relatively warm water is applied to the items to be washed. The hot water can be taken in before or during the respective program step.

Intake of hot water for such a program step is in particular more energy and cost efficient than ingestion of cold water if the external water supply system, in particular thermal solar system, provides sufficient thermal energy. The reason for the increased cost efficiency is that when hot water is taken in, the internal electrical energy requirement of the Dishwasher for at least one partial wash cycle of the wash cycle of a selected dishwashing program drops significantly due to a reduced electrical energy requirement for heating the water taken up. This can lead to a significant reduction in household electricity costs. In this way, an increase in efficiency can be achieved compared to a dishwasher, which is provided exclusively for connection to a cold water supply.

According to the invention, it is provided that at least one wash program can be called up in the first operating mode, which additionally provides for the use of cold water from the cold water supply in at least one program step of the respectively selected dishwashing program, ie in at least one partial wash cycle of the associated wash cycle. I According to the invention, the sequence control device is designed and coupled to the hot water supply device and the cold water supply device such that hot water is required for a first group of partial wash cycles in the wash cycle of a selected dishwashing program, each of which requires a specific wash bath hot water temperature greater than the cold water temperature of the cold water of the external cold water supply from the external hot water supply by means of the hot water supply device can be fed into the rinse tank in a partial rinse-specific manner, and that for a second group of partial rinse cycles of the rinse cycle of the selected dishwashing program, cold water from the external cold water supply can be fed into the rinse tank specifically for the rinse tank by means of the cold water supply device.
The first operating mode is therefore a combined hot and cold water operation. Due to the at least partial use of cold water from the external cold water supply, it is possible to obtain cold water from the cold water supply for the partial rinse cycles of those program steps in which the use of water at high temperatures has no advantages or disadvantages. This enables an energy efficiency increase for the dishwasher according to the invention to be achieved. Here too, the cold water can be absorbed before or during the respective partial rinse cycle. In particular, the use of cold water is advisable for the "pre-rinse" and "intermediate rinse" partial rinse cycles.

In contrast to a dishwasher, which is only intended to be connected to a hot water supply, disadvantages in terms of washing technology can be avoided, which could occur due to the forced use of hot water in special program steps. In addition, the partial absorption of cold water from the external cold water supply can reduce the amount of hot water that has to be taken from the external hot water supply for a rinse cycle without having to accept substantial disadvantages with regard to the cleaning effect and / or the drying effect. In this way, it can be ensured in the first operating mode that the amount of hot water withdrawn from the external hot water supply system, in particular thermal solar system, when carrying out a washing cycle is limited to a maximum. As a result, the first operating mode can also be selected if necessary if the external hot water supply system, in particular its solar collectors, provides comparatively little thermal energy.

Overall, in the first operating mode one or more washing programs are each possible for controlling a washing cycle, which each carry out individual program steps such as e.g. B. Pre-rinse step, intermediate rinse step with the specific use of hot water from the external hot water supply and the implementation of other program steps with the specific use of cold water from the external cold water supply system. In this way, compared to known dishwashers, which - as is common in Europe in particular - are only intended to be connected to a cold water supply, as well as known dishwashers which - as is common in North America in particular - are only intended to be connected to a hot water supply a significant increase in efficiency can be achieved.

Furthermore, it is according to the invention if, for the specific, ie individually assigned, supply of hot water from the external hot water supply system for a first group of one or more partial rinse cycles of the respective rinsing cycle and of cold water from the external cold water supply system for a second group of one or more partial rinse cycles externally available heat exchanger, in particular in the form of a water bag or storage container, which is attached to a wall, in particular the side wall, of the washing container in a heat-transferring manner, for example by contacting, is filled with cold water from the external cold water supply system at the end of the rinse cycle and / or at the start of the subsequent drying cycle. As a result, the wall surface of the rinsing container contacted by the heat exchanger can be cooled, for example during the drying process, and the condensation of liquid on the inner wall surface of the wall of the rinsing container provided with the heat exchanger on the outside can be improved, so that this results in an improved drying result.

In the event that hot water from the external hot water supply system is used for all water-carrying partial rinse cycles of the selected dishwasher program, because e.g. no cold water connection at all, but only a hot water connection is available, or because a dishwasher program is selected by means of the dishwasher control, in particular by manually pressing its auxiliary button for external hot water supply, which only provides hot water for all of its partial rinse cycles, if the heat exchanger is not filled with hot water at the end of the rinse cycle, but remains empty for the duration of the drying cycle. This prevents the condensation process in the washing compartment from being impaired by an additional quantity of hot water. This also avoids that hot water would be filled into the heat exchanger at the end of the rinse cycle, cooled to ambient temperature by the start of the next dishwashing program and as "cold" water would be added to the dishwashing bath during the pre-wash cycle of the subsequent dishwashing program, which would lead to an impairment of any desired heating process during the pre-rinse cycle.

As soon as the user deactivates the hot water supply, in particular an additional function key provided, by means of the control device of the dishwasher, the sequence control device ensures in particular that only cold water from the cold water supply is supplied to the rinse baths in all partial rinse cycles of the selected dishwasher program. For those partial wash cycles, for their respective rinse bath quantity, a specific minimum temperature higher than the cold water temperature is required, the cold water to be introduced for the respective rinsing bath is heated by the heating device of the liquid flow system, in particular the circulation pump, of the dishwasher and brought to the desired specific minimum temperature.

According to an expedient development of the invention, an operating device is provided which enables the operating mode to be selected manually. Such an operating device enables the operator to decide for himself whether hot water should be used partially or exclusively or whether only cold water should be taken up. The operating device can be an additional button, for example, which is arranged on an operating panel of the dishwasher. But it is also possible to switch the operating mode operating devices such. B. multifunction buttons, knobs, touch screens, alphanumeric input units and the like. This additional button can in particular also be provided for other operator interventions for checking and controlling the dishwasher.

According to an expedient development of the invention, the dishwasher has, in particular, a data interface which is provided for receiving operating data from the external hot water supply system, in particular a thermal solar system. The sequence control device can be designed to automatically select the operating mode on the basis of received operating data. Such operating data can be, for example, information relating to the performance of solar collectors or information relating to the amount of heat stored in a heat store, in particular a buffer store, of a thermal solar system. In this way, an automatic selection of the more efficient operating mode is possible.

According to a preferred development of the invention, it is provided in particular that the hot water supply comprises a hot water valve and the cold water supply comprises a cold water valve, the hot water valve and the cold water valve being controllable independently of one another, ie individually by the sequence control device of the dishwasher. As a result, it is possible in a simple manner to take up the provision of by the washing programs of the two operating modes To carry out hot water from the warm water supply system and / or from cold water from the external cold water supply system in a partial rinse cycle. In particular, an external device for controlling the water absorption can be dispensed with.

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 is designed such that it can be attached to a connector 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 on is designed so that it can be attached 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, connecting threads which correspond to threads of household water taps. Valves of this type 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 supply 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 in particular so that they close when they are not activated, leakage of water from a switched-off dishwasher is prevented in practically all cases. In order to prevent leakage water from escaping from a switched-on dishwasher, the sequence control device can optionally include a leakage water sensor, e.g. in the rinsing container or a collecting trough below the rinsing container for detecting leakage water, so that the sequence control device can close the valves if leakage water occurs during operation of the dishwasher.

According to a preferred development of the invention, it is provided in particular that the connection piece is provided externally from the dishwasher, and that the downstream end of the hot water hose and the downstream end of the cold water hose can be connected in a liquid-conducting manner via the connection piece to an inlet hose which is connected to the device-side, in particular housing-fixed Connector of the dishwasher can be coupled or coupled. A such merging of the two water supply devices for hot water and cold water of the water supply device is structurally simple and shortens the total 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 away from the installation location of the dishwasher, since in this case on two longer parallel hoses can be dispensed with.

As an alternative to this external arrangement of the connecting piece or merging piece outside the dishwasher, it may be advantageous if the connecting piece is firmly coupled to the device-side, in particular device-internal, to the device-side connecting piece or is integrally formed thereon. It has a first connection branch on one side for connecting the hot water hose and a second connection branch on the input side for connecting the cold water hose. The external common inlet hose is therefore no longer necessary. This connector can be attached to or in the dishwasher in particular from the outset in the factory. In particular, the connector together with the connector in the area of the base assembly of the dishwasher, i.e. be provided below or in the rinsing container. It can preferably have a Y-shaped or F-shaped geometric shape.

The invention also relates to a method for controlling at least one wash cycle of a dishwasher, in particular a domestic dishwasher, which has a hot water supply device for the entry of hot water from an external hot water supply and a cold water supply device for the entry of cold water from an external cold water supply, by means of at least one washing program of a sequence control device, whereby the sequence control device calls up at least one washing program in a first operating mode, in which hot water from the external hot water supply is specifically obtained for at least one partial washing step of the washing step implemented by it, and wherein at least one washing program is called up by the sequence control device in a second operating mode, for which at least one partial rinse of the rinse cycle implemented by him exclusively draws cold water from the external cold water supply, and whereby by means of the sequence control device The hot water supply device and the cold water supply device are controlled in such a way that in the first operating mode for a first group of one or more partial wash cycles of the wash cycle carried out by a selected dishwashing program, for each of which a specific wash bath hot water temperature greater than the cold water temperature of the cold water of the external cold water supply is required, Hot water from the external hot water supply is fed into the rinse tank specifically for the partial wash cycle by means of the hot water supply device, and that for a second group of one or more partial wash cycles of the wash cycle of the selected dishwashing program, for which the cold water temperature of the cold water of the external cold water supply is sufficient or required as the specific rinse bath hot water temperature is to partially rinse cold water from the external cold water supply into the rinsing tank using the cold water supply device is fed specifically to the aisle, with an externally available heat exchanger, in particular in the form of a water pocket or a storage container, which is attached to a wall, in particular the side wall, of the rinsing container in a heat-transferring manner, at the end of the rinse cycle and / or at the beginning of the subsequent drying cycle of the rinse cycle with cold water of the external cold water supply device, and that in the event that hot water from the external hot water supply is used for all water-carrying partial rinse cycles of the wash cycle carried out by a selected dishwasher program, the heat exchanger is not filled with hot water at the end of the rinse cycle, but during the duration of the drying cycle this rinse cycle remains empty.

Other training and further developments of the invention are given in the subclaims. The advantageous embodiments and further developments of the invention explained above and / or the one described in the subclaims can be used individually or in any combination with one another in the dishwasher according to the invention and the method according to the invention.

The invention, its training and further developments and the advantages thereof are explained below with reference to drawings.

Figur 1

eine schematisierte räumliche Darstellung eines vorteilhaften Ausführungsbeispiels einer erfindungsgemäßen Geschirrspülmaschine;

Figur 2

ein Blockschaltbild der Geschirrspülmaschine der Figur 1;

Figur 3

ein Spülprogramm einer ersten Betriebsart der Geschirrspülmaschine der Figur 1, und

Figur 4

ein Spülprogramm einer zweiten Betriebsart der Geschirrspülmaschine der Figur 1.

Show it:

Figure 1

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

Figure 2

a block diagram of the dishwasher of the Figure 1 ;

Figure 3

a washing program of a first operating mode of the dishwasher Figure 1 , and

Figure 4

a washing program of a second operating mode of the dishwasher Figure 1 .

In the following figures, parts that correspond to one another are provided with the same reference symbols. Only those components of a dishwasher that are necessary for an understanding of the invention are provided and explained with reference numerals. It goes without saying that the dishwasher according to the invention can comprise further parts and assemblies.

Figure 1 shows a schematic spatial representation of an advantageous embodiment of a dishwasher 1 according to the invention. This has a washing container 2, which can be closed by a door 3, so that a washing cell for washing dishes is created. The washing container 2 is arranged in the interior of a housing 4 of the dishwasher 1, which can have standard dimensions. For example, the housing 4 can have a width of 45 cm or 60 cm, which enables the dishwasher 1 to be integrated into a standard kitchen unit with a corresponding recess. This housing 4 can optionally be partially or completely omitted such. B. in built-in dishwashers.

A schematically illustrated water supply device 5 is arranged on the back of the dishwasher 1. This has a hot water supply device 51 and a cold water supply device 52, the hot water supply device 51 being provided for receiving hot water from an external hot water supply WA and the cold water supply device 52 for receiving cold water from an external cold water supply KA.

The hot water supply device 51 comprises a controllable hot water valve 6 and the cold water supply device 52 a controllable cold water valve 8. The hot water valve 6 and the cold water valve 8 are basically identical in construction. For example, both valves 6, 8 can be designed as a solenoid valve. The inlet sides of the valves 6, 8 are each designed in such a way that they can be attached to connecting pieces, for example to water taps WH, KH, to the domestic or building-side hot water supply WA and cold water supply KA. The connection can be made by means of a screw connection, a snap connection or the like. Valves 6, 8 of this type can be designed in particular as aquastop valves. Advantageously, these are each closed when they are not activated, so that the dishwasher 1 is disconnected from the hot water supply and the cold water supply when it is switched off. In this way, leakage of water from the switched off dishwasher 1 can be avoided in the event of a fault.

Intended is in Figure 1 the input side of the hot water valve 6 is connected to the hot water tap WH and the input side of the cold water valve 8 is connected to the 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 is connected to a cold water hose 9, the downstream ends of the hot water hose 7 and the cold water hose 9 being connected to the input side of an external, common connecting piece 10. A common inlet hose 11 for hot water and cold water connects to its outlet side, 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 consequently possible to conduct hot water WW from an external hot water supply WH and / or cold water KW from an external cold water supply KH individually controlled into the interior of the dishwasher 1.

The hot water hose 7, the cold water hose 9 and / or the common inlet hose 11 can be designed as safety hoses with an inner water-carrying pressure hose and an outer jacket hose, with between Pressure hose and enveloping hose can each be provided with a leakage water channel for discharging any leakage water that may occur. The connecting piece 10 can be designed such that the leakage water channels of the hot water hose 7, the cold water hose 9 and the common inlet hose 11 are connected to one another, so that leakage water which occurs in the area of the water inlet device 5 during operation of the dishwasher 1 via the connection piece fixed to the housing 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 cold water valve 8, can be initiated.

The connector can in particular as a Y-branch, F-shaped or other geometric shape for merging the cold water hose 9 and the hot water hose 7 in a common junction line such. B 12 should be formed.

As an alternative to this external arrangement of the connector 10 outside the dishwasher, it may be advantageous if the connector on the device side, in particular device-internal, is directly coupled to the device-side, in particular device-internal, connector piece 12, or replaces it. In particular, this can be prepared at the factory. With this alternative, expedient embodiment variant, the external, common inlet hose can be saved. It can be useful if the hot water hose 7 and the cold water hose 9 are already preassembled on this device-internal equipment component. In particular, the common connecting piece can be provided on or in the area of the base assembly of the dishwasher.

A free flow path 13 is provided downstream of the connector 12 fixed to the housing or of the connector 10 provided inside the device, which can possibly replace the connector 12. The free flow path 13 is a so-called pipe interruption, which serves to prevent water from being sucked back out of the dishwasher 1 if a vacuum is created in the respective external water supply due to dynamic processes. This will In particular, it prevents water that has already been used, which can be mixed with dirt, cleaning agents and / or cleaning aids, from getting back into the building's water supply from the rinsing tank 2. As a result, hygiene regulations with regard to drinking water networks and / or industrial water networks can be complied with in a reliable manner.

The dishwasher 1 also shows in Figure 1 Components not shown, which make it possible to direct hot water WW and / or cold water KW from the outlet of the free flow path 13 into the washing container 2.

A pump pot 16 is provided in a lower region of the washing container 2, in which a circulation pump for circulating water in the washing container 2 is expediently provided during a washing cycle to be carried out. The circulation pump can also include a heating device for heating the water in the washing container 2, for example a water heater. Likewise, a wastewater pump, in particular a drain pump, for pumping out water, for example at the end of a rinse cycle, can be provided in the pump pot 16. The various pump functions can also be performed by a single pump in conjunction with switchable valves. The pump pot 16 is generally connected to a waste water connection piece 17 by means not shown, so that water can be pumped out of the rinsing container 2 via a waste water hose 18 connected to a waste water connection piece 17 into a waste water device A, for example a waste water pipe A, installed on the building side. The circulation pump and the sewage pump are in the Figure 1 has been omitted for the sake of simplicity. they are in the Figure 2 shown and designated 22, 24.

In Figure 1 the hot water supply device 51 of the dishwasher 1 is, as intended, connected to an external hot water supply WA, which in the exemplary embodiment is supplied with hot water WW in particular by a thermal solar system TSA. The thermal solar system TSA comprises one or more or a large number of SOK solar collectors, of which only one collector is shown for reasons of space. The SOK solar collectors each have an absorber surface, not shown, which can be heated by the electromagnetic solar radiation. From there, the heat can be converted to one by means of a fluid Heat exchangers WT are transported, which generates the hot water WW for the hot water supply WA. This hot water can in particular be stored in a buffer store PS via an inlet line ZL and can be removed from this buffer store via a hot water line WL.

In order to be able to provide enough hot water in situations in which the thermal energy provided by the solar collectors is not sufficient, the hot water supply WA here in the exemplary embodiment has a conventional additional heating system ZH, for example a gas or oil heating system, or pellet heating system or a heat pump system, which also Deliver heat to the heat exchanger WT or directly via an in Figure 1 Supply line, not shown, can be connected to the buffer memory PS.

The dishwasher 1 also has a sequence control device 19 for controlling the course of a wash cycle according to a selected dishwasher program. In this case, the sequence control device 19 comprises a first operating mode in which one or more washing programs can be called, each of which performs a washing cycle in such a way that the specific use of hot water WW from the hot water supply WA is provided for one or more partial washing cycles. Furthermore, the sequence control device comprises a second operating mode in which one or more washing programs can be called up, each of which is implemented in a washing cycle in such a way that only cold water KW from the cold water supply KA is used for its partial washing cycle sequence.

The sequence control device 19 is connected to an operating device 20 which, in the exemplary embodiment, is arranged on a control panel of the door 3 of the washing compartment 2. The sequence control device 19 itself is housed inside the door 3. However, both could also be arranged elsewhere in the dishwasher 1. The operating device enables the operator to manually set the desired operating mode and to manually select an individual program that is available for the respectively selected operating mode. The operating device 20 includes, in particular, an additional function key ZT for the manual selection of the hot water supply from the hot water supply system WA if, as in the exemplary embodiment here, by the thermal solar system TSA alone or exclusively is fed, or provides a predetermined minimum heat input to the amount of hot water in an existing water heating system.

Optionally, the dishwasher 1 can have a data interface 20a, which is provided for receiving operating data for the hot water supply WA. For this purpose, it can e.g. B. can be connected via a data line DL1, for example, to a control unit and / or sensor unit SE of the thermal solar system TSE. In particular, a temperature sensor can be provided as sensor unit SE. The data line DL1 and the data interface 20a are shown in FIG Figure 1 additionally shown in dash-dotted lines. The data interface 20a is also connected to the sequence control device 19 via a Figure 1 Data line DL2 shown in dash-dot lines is connected. The sequence control device 19 can then expediently be designed to automatically select the operating mode on the basis of the operating data provided by the control unit and / or sensor unit SE via the data lines DL1, DL2. For example, it is possible for the dishwasher 1 to automatically switch to the second operating mode when the heating power of the solar collectors SOK falls below a certain limit value ST, and to change to the first operating mode when the heating power of the solar collectors exceeds this limit value ST. It is also possible to automatically control the operating mode as a function of the temperature in the heat exchanger WT and / or buffer store PS. This can be particularly useful if the hot water supply is provided solely by the thermal solar system TSA, ie there is no additional heating ZH. The sequence control device 19 switches to the second operating mode when the temperature of the hot water WW generated by the solar system TSA falls below a certain minimum temperature. It can also be provided that the second operating mode is automatically changed when the additional heater ZH is switched on. Here in the exemplary embodiment, the control and / or sensor unit is in particular assigned to the heat exchanger WT. In addition or independently of this, it can also be assigned to the buffer memory PS.

Figure 2 shows a schematic block diagram of the dishwasher 1 of FIG Figure 1 . The hot water valve 6 and the cold water valve 8 are each connected to the sequence control device 19 via separate control lines SL6, SL8 that both can be controlled individually. This makes it possible to specifically feed the washing container 2 of the dishwasher 1 with hot water and / or cold water via the connector 10, the free flow path 13 and an outlet 21.

The circulation pump 22, which is designed as a heating pump and is connected to a spray system 23 arranged in the interior of the washing container 2, is arranged in the pump bowl 16 of the washing container 2. As a result, it is possible to apply water to items to be washed arranged in the washing compartment 2 during a washing cycle for its partial washing cycles in order to clean them. Furthermore, the sewage pump 24 is arranged in the pump pot, which enables water that is no longer required to be pumped out into the sewage pipe A. In the circulation pump 22, both the heating function and the pump function can be individually controlled by the sequence control device 19, which in the Figure 2 is symbolized by a control line SL22. Furthermore, the sequence control device 19 is also connected to the drain pump 24 for controlling it in a corresponding manner via at least one control line. This is here in the Figure 2 omitted for the sake of clarity.

The operating device 20 is connected to the sequence control device 19 via one or more control lines SL1 in such a way that operating commands can be transmitted from the operating device 20 to the sequence control device 19 (and vice versa). Furthermore, the data interface 20a is connected to the sequence control device 19 via one or more data lines DL1 in such a way that the operating data of the thermal solar system TSA received from the data interface 20a can be transmitted from the data interface 20a to the sequence control device 19.

The loading of the dishwasher 1 with water takes place, as does the control of the circulation pump 22 and the drain pump 24, as well as other devices of the dishwasher 1 not explained here, depending on a selected dishwasher program. The washing programs are stored in the sequence control device 19, and different washing programs can be called up depending on the operating mode set. In the first operating mode, at least one rinse program is provided, which can be selected specifically for the efficient use of solar-heated water.

Figure 3 shows an exemplary washing program SP1 of the dishwasher 1 of FIG Figures 1 and 2nd which can be selected in the first operating mode. The washing program SP1 is intended to control the timing of a washing cycle when the hot water supply device 51 of the dishwasher 1 is supplied with hot water generated by solar thermal energy from a thermal solar system TSA. Here, in the exemplary embodiment, in this chronological order, it comprises a pre-rinse step VS, a subsequent cleaning step RS, a subsequent intermediate rinse step ZS, a downstream rinse step KS and a final drying step TS. The rinse program SP1 correspondingly implements a pre-rinse cycle VS, a cleaning cycle RG, an intermediate rinse cycle ZG, a rinse cycle and a final drying cycle TG of an associated rinse cycle SG1 as partial rinse cycles. The pre-rinse cycle VG, the cleaning cycle RG, the intermediate rinse cycle ZG and the rinse cycle are subjected to liquid.

In the Figure 3 the curves SWV, SKV, BAP and BSB 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 to a closed valve 6, 8, the switching state "1" to an open one Valve 6, 8. The curve BAP also shows the operating state of the waste water pump 24, the switch-off state being symbolized by "0" and the switch-on state by "1". Finally, the curve BSB shows the state of loading of the washing container 2 with water. Here, a washing container 2 charged with hot water from the hot water supply WH is represented by "WW", a washing container 2 supplied with cold water from the cold water supply KH is represented by "KW" and an empty washing container 2 is represented by "0".

In the exemplary embodiment, the washing program SP1 is preferably a typical normal washing program which is provided for cleaning normally soiled items. In other examples, one or more of these steps could be hidden. Examples would also be possible, such as an intensive program, in which one or more steps are run through several times.

The pre-rinsing step VS initially carried out serves to remove coarser soiling from the dishes in a pre-rinse cycle in order to prepare the cleaning step RS. For this purpose, the cold water valve 8 is opened at the beginning of the pre-rinsing step VS until the rinsing tank 2 is supplied with a sufficient amount of cold water KW from the cold water supply KA. This cold water is circulated by means of the circulation pump 22 for a predetermined time, as a rule without switching on its heating device, so as to apply cold water KW to the items to be washed. Then the now dirty cold water is pumped out by means of the waste water pump 24.

The use of cold water KW from the cold water supply KA during the pre-rinse step VS to carry out the pre-rinse cycle VG is possible without any problems, since the coarser dirt is removed mechanically, so that high temperatures during the pre-rinse step can be dispensed with in many cases. This means that reheating by means of the heating device of the circulation pump 22 can be avoided or, if necessary, can be carried out with a small amount of electrical energy. At the same time, the amount of heat withdrawn from the hot water supply WH can be reduced without the cleaning result being noticeably impaired.

The subsequent cleaning step RS is used for thorough cleaning of the wash ware in one cleaning cycle RG. For this purpose, the hot water valve 6 is opened at the beginning of the cleaning step RS until the rinsing tank 2 is supplied with a sufficient amount of hot water WW from the hot water supply WA. The hot water WW filled into the washing compartment 2 is now circulated for a predetermined time with the aid of the circulation pump 22, so that hot water is applied to the items to be washed. The heating device of the circulation pump 22 can be switched on as required depending on the temperature of the hot water supplied and depending on the intended rinsing temperature of the cleaning step RS if the water inlet temperature from the hot water supply WA is below a desired target temperature for the rinsing bath of the cleaning cycle RG lies. At the end of the cleaning step RS, the now dirty hot water is pumped outwards by means of the waste water pump 24.

During the cleaning step RS, it is generally 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, detergent is generally added to the water, the chemical cleaning effect of which is best at higher temperatures. In particular, a target rinsing bath temperature of approximately 50 ° C. to 70 ° C. is selected for the cleaning step RS. When using hot water WW from the thermal solar system TSA for the cleaning step RS, it is thus ensured that the thermal energy extracted from the solar system TSA is used sensibly, without the further consumption of energy by the device-internal heating device of the dishwasher 1 and without further heating device of the external hot water supply WA becomes. In this case, a high saving of electrical energy can be achieved, because in many cases the hot water from the thermal solar system TSA does not need to be reheated by the electrical heating device of the dishwasher 1 in other cases, in order to provide the heating for the RG cleaning cycle to achieve the required target rinse bath temperature.

The intermediate rinsing step ZS now carried out for removing detergent from the wash ware after the cleaning step RS in an intermediate rinse cycle ZG likewise provides for the washing container 2 to be fed with cold water KW from the cold water supply KA in order to be able to apply cold water to the wash ware. For this purpose, the cold water valve 8 is first opened until the rinsing container 2 is charged with a sufficient amount of cold water for the intermediate rinsing step ZS. This cold water is circulated for a predetermined time by means of the circulation pump 22, it being possible as a rule not to switch on its heating device. Then the now dirty cold water is pumped out by means of the waste water pump 24.

As a rule, no higher temperatures are required during the intermediate rinsing step ZS, so that cold water from the cold water supply can also be used in the intermediate rinsing step ZS without this being higher electrical energy use by means of the heating device of the circulation pump 22 would have to be heated. At the same time, the amount of heat withdrawn from the hot water supply WA can be further reduced without the cleaning result being impaired.

In the now following rinse step KS for carrying out a rinse cycle KG, warm water WW from the hot water supply WA is provided for washware. For this purpose, the hot water valve 6 is first opened again until the rinse tank 2 is supplied with a sufficient amount of hot water WW from the hot water supply WA for the rinse step KS. The hot water filled into the washing container 2 is then circulated for a predetermined time with the aid of the circulation pump 22, so that hot water is applied to the items to be washed. Even during the final rinse step KS, the heating device of the circulation pump 22 can be switched on as required depending on the temperature of the hot water supplied and depending on its intended rinse temperature. If the inlet temperature of the hot water WW is equal to or above the minimum temperature desired for the rinse aid KG, the heating device of the circulation pump 22 can advantageously remain switched off or deactivated. If the inlet temperature of the hot water is below the required minimum temperature, the electrical heating device of the liquid circulation system of the dishwasher can be switched on for reheating. In any case, the use of hot water can reduce the energy consumption of the dishwasher. At the end of the final rinse step KS, the now dirty hot water is pumped outwards by means of the waste water pump 24.

A rinse aid step KS 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 rinse aid is added to the water during the rinse aid step KS. Another task of the rinse aid step KS is to prepare the subsequent drying step TG in the drying step TS. Thus, during the rinse step KS, the dishes are heated up by using particularly hot water, which has a temperature of 60 ° C. to 75 ° C., for example. As a result, in the subsequent drying step TS, water droplets adhering to the hot dishes evaporate and hit the inside of the washing compartment 2 due to the fact that there prevailing lower temperature. When using hot water from the solar system TSA for the final rinse step KS, it is also ensured that the thermal energy extracted from the solar system TSA is used sensibly. A high saving of electrical energy can also be achieved here, because the hot water from the solar system TSA is heated to such a high temperature that in many cases it is not necessary, in other cases only to a small extent, by means of the electrical heating device in To have to reheat the liquid circulation system of the dishwasher 1 in order to reach the temperature required for the rinse step KS.

During the final drying step TS, the washing container 2 is not provided with water.

Furthermore, it can be particularly useful if during the first mode of operation, i.e. when drawing hot water from the external hot water supply system WA for the drying cycle TG cold water KW from the external cold water supply system KA into an externally available heat exchanger, in particular in the form of a water pocket or storage container VB after the end of the Rinse aid KG is filled. This reservoir VB is in the Figure 1 dash-dotted lines on a wall, in particular the side wall, of the washing compartment 2. It communicates with the washing container 2 in a heat-transferring manner, for example by contacting. It is connected downstream of the connection piece 12 fixed to the housing and the free flow path 13 and has an outflow into the rinsing container 2, which in the Figure 1 has been omitted for the sake of clarity. By filling it with cold water, the wall surface of the rinsing container contacted by the heat exchanger can be cooled during the drying process and the condensation of liquid on the inner wall surface of the wall of the rinsing container provided with the heat exchanger on the outside can be improved, so that this results in an improved drying result.

In the event that only hot water from the external hot water supply system is used for all water-carrying partial rinse cycles of the selected dishwashing program, because, for example, there is no cold water connection at all, but only a hot water connection is available, or because the dishwasher controls, in particular by manual pressing Whose additional button ZT is selected for external hot water supply, a dishwashing program that only, i.e. exclusively provides hot water for all of its partial rinse cycles, it is useful if the heat exchanger is not filled with hot water at the end of the rinse cycle, but empty during the drying cycle, i.e. remains unfilled. For this purpose, the outlet valve VEN in the outlet AL of the storage container VB is not shut off at the end of the rinse cycle KG as in the case of a pure cold water connection, but remains open so that the incoming hot water can run into the washing container and the heat exchanger or storage container VB remains empty. On the one hand, this prevents the condensation on the inner walls of the rinsing container from being deteriorated during the drying cycle by an additional amount of hot water compared to the case of a dishwasher which has no heat exchanger at all. On the other hand, it is also avoided that hot water, which would be filled as a filling in the heat exchanger at the end of the rinse cycle, would be cooled to ambient temperature by the start of the next dishwashing program and that the water in the rinse bath during the pre-rinse and / or cleaning cycle would have cooled down over time subsequent dishwashing cycle would be supplied, which would lead to an impairment of any desired heating process during the pre-wash cycle and / or cleaning cycle.

Figure 4 shows an exemplary washing program SP2 of the dishwasher 1 in FIG Figures 1 and 2nd which can be selected in an advantageous embodiment of the second operating mode. The washing program SP2 is intended to control a sequence of a washing cycle if the hot water supply WA is supplied with hot water WW generated by the additional heater ZH and the thermal energy provided by the solar system TSA makes an insufficient contribution.

The wash program SP2 or the associated wash cycle SG2 is also a normal wash program, which corresponds to the normal wash program SP1 described above or its associated wash cycle SG1 in such a way that it has an essentially identical cleaning and drying effect.

The difference is in particular that the washing program SP2 now only provides for the use of cold water KW from the cold water supply KA, because the heat input into the total volume of the buffer storage PS is too low in relation to the contribution from the heating system ZH. This prevents thermal energy from being withdrawn from the hot water supply WA if, for example, the solar collectors SOK supply too little thermal energy. In program steps RS, KS, in which it is necessary or desirable to apply water at a higher temperature to the wash ware, in particular in the cleaning step RS and in the rinse step KS, the water provided for loading the wash ware alone, i.e. exclusively by means of the water heater of the circulation pump 22, i.e. generally expressed with an electric heating device in the liquid circulation system of the dishwasher. The additional costs for the electrical energy required for this are in many cases lower than the additional costs that would arise if the additional heating ZH of the external hot water supply WA had to be switched on due to an additional hot water extraction.

As soon as the user provides an exclusive cold water supply for the partial wash cycles of a desired dishwashing program by means of the operating device 20, in particular by deactivating its additional function key ZT, the sequence control device 19 of the dishwasher 1 ensures that only cold water is provided for the wash baths in all partial wash cycles of the wash cycle of the selected dishwashing program is fed from the cold water pipe. For those partial rinse cycles for which a specific target minimum temperature is required higher than the cold water temperature for the respective rinse bath quantity, the amount of cold water to be introduced for the respective rinse bath is heated by the heating device of the liquid circulation system, in particular the circulation pump, the dishwasher and to the desired, specific minimum or Target temperature brought.

In this second operating mode, it is expedient if the heat exchanger VB is filled with cold water KW after the end of the rinse step, that is to say the heat exchanger remains filled with cold water during the period of the drying step, so that the heat it contacts or otherwise connects to it in a heat-conducting manner Surface of the rinsing container is cooled to improve the condensation effect.

In an advantageous exemplary embodiment, the invention relates to a dishwasher with an additional function key, preferably for the selection of hot water supply from an additional hot water supply system, which in particular by alternative energy sources such as e.g. a hot water solar system is partially or completely powered. In this case, two water connections or water supply devices are expediently provided, each of which can be controlled separately with a valve, in particular an aquastop valve. This means that the dishwasher has a bithermal water connection with hot water supply and cold water supply. One water connection is therefore for hot water, in particular warm, inexpensive solar water, and another water connection is provided for cold water from the cold water supply network. Both water connections can be selected individually or specifically via a controller on the dishwasher. After the two valves, the water then flows via a connecting piece or merging piece, possibly via a common supply hose, to a water inlet system of the dishwasher, which is connected to its liquid circulation system.

On this basis of hot and cold water connections, ie two water connections, the dishwasher now expediently has an additional function key (see ZT in Figure 1 ) (Solar button), which can be arranged in particular on the cover, preferably control panel, of the dishwasher. When this button is pressed, special flushing processes with flushing steps can be activated in the control unit or sequence control device, which are designed for any available hot water from the hot water supply system, in particular hot water solar system.

Manual selection using the additional button may be omitted if the dishwasher e.g. the data is transmitted via data transmission, in which way or operating mode - e.g. B. solar or e.g. with heating oil - just heating.

The aim of these special washing programs of the dishwasher designed according to the invention is, in particular, always to a large extent the washing and drying performance of the dishwasher with the lowest energy consumption to keep constant without the operator having to remember to close his water connection. It is therefore not necessary to connect the cold water hose to the hot water tap for drawing hot water. It is also not necessary to reconnect it to the cold water connection for the supply of cold water.

The dishwasher designed according to the invention can now react to change requests regarding cold water and hot water supply by actuating the operating device, in particular pressing the additional function key, in various ways in order to achieve the goal of achieving good washing and drying performance that is as energy-saving as possible. In particular, the customer can switch his dishwasher to cold water operation even in the summer months when the weather is bad or during the transition to the winter months by deactivating the additional button if too little energy is fed into the hot water tank via the hot water solar system.

As soon as the user has pressed the additional function key, that is to say has activated it or, more generally speaking, has actuated the operating device accordingly, the sequence control device of the dishwasher designed according to the invention ensures, in accordance with an advantageous operating variant, in particular that a rinse cycle for the rinse baths of those partial rinse cycles, such as cleaning cycle and rinse cycle a selected dishwashing program, each of which requires a specific minimum temperature higher than the cold water temperature KT, hot water from the available additional hot water supply system, which is particularly coupled with a thermal solar system, and that for the rinse baths in those partial rinse cycles of the wash cycle, in which only cold water is sufficient, only cold water from the cold water supply is used without additional heating.

Reference list

1

dishwasher

2nd

Rinsing tank

3rd

door

4th

casing

5

Water supply device

6

Hot water valve

7

Hot water hose

8th

Cold water valve

9

Cold water hose

10th

Connector

11

Inlet hose

12th

housing-fixed connector

13

free flow path

16

Pump pot

17th

Sewage connector

18th

Sewage hose

19th

Sequence control device

20th

Control device

20a

interface

21

procedure

22

Circulation pump with instantaneous water heater

23

Spraying device

24th

Drain pump, sewage pump

51

Hot water supply device

52

Cold water supply device

A

Sewer pipe

BAP

Sewage pump operating status

BSB

Filling status of the rinsing container

DL1, DL2

Data lines

KA

Cold water supply

KH

Cold water tap

KG

Rinse aid

KS

Rinse Aid

KT

Chilled water temperature

PS

Buffer storage

RS

Cleaning step

RG

Cleaning cycle

SOK

Solar panel

SE

Control and / or sensor unit

SG1, SG2

Rinse cycles

SKV

Switching status of the cold water valve

SL1, SL7, SL8, SL22

Control lines

SP1

Rinse program of the first operating mode

SP2

Dishwashing programs in the second operating mode

ST

Minimum temperature

SWV

Switching status of the hot water valve

TG

Drying cycle

TS

Drying step

TSA

Thermal solar system

VS

Pre-rinse step

VG

Pre-rinse

WA

Hot water supply

WH

Hot water tap

WL

Hot water pipe

WT

Heat exchanger

ZH

Additional heating

ZG

Intermediate rinse cycle

ZL

Inlet lines

ZS

Intermediate rinse step

ZT

Auxiliary key

Claims (9)

1. Dishwasher, particularly household dishwasher (1), comprising a hot water inlet device (51) for the intake of hot water (WW) from an external hot water supply (WA), a cold water inlet device (52) for the intake of cold water (KW) from an external cold water supply (KA), and a programme control device (19) for controlling a wash cycle of a selected dishwashing programme for cleaning wash items, wherein the programme control device (19) has a first operating mode in which at least one wash programme (SP1) can be activated which, in at least one partial wash cycle (RG) of a wash cycle (SG1), specifically makes provision for a drawing of hot water (WW) from the external hot water supply (WA), and wherein the programme control device (19) has a second operating mode in which at least one wash programme (SP2) can be activated which, in at least one partial wash cycle (TG) of a wash cycle (SG1), specifically makes provision exclusively for a drawing of cold water (KW) from the external cold water supply (KA),
   characterised in that
   the programme control device (19) is embodied and coupled to the hot water inlet device (51) and the cold water inlet device (52) in such a manner that in the first operating mode for a first group of one or more partial wash cycles (RG, KG) of the wash cycle (SG1) performed by a selected dishwashing programme (SP1), for each of which a specific wash bath hot water temperature (ST) higher than the temperature (KT) of the cold water (KW) from the external cold water supply (KA) is required, hot water (WW) can be fed from the external hot water supply (WA) by means of the hot water inlet device (51) into the wash chamber (2), specifically to the partial wash cycle, and that for a second group of one or more partial wash cycles (VG, ZG) of the wash cycle (SG1) of the selected dishwashing programme (SP1), for which the cold water temperature (KT) of the cold water (KW) from the external cold water supply (KA) is sufficient or required as the respective specific wash bath hot water temperature (ST), cold water (KW) can be fed from the external cold water supply (KA) by means of the cold water inlet device (52) into the wash chamber (2), specifically to the partial wash cycle, wherein a heat exchanger which is present externally, in particular in the form of a water pocket or a storage tank (VB), which is attached to a wall, in particular side wall, of the wash chamber (2) in a heat-transmitting manner, is filled with cold water (KW) from the external cold water inlet device (52) at the end of the rinse aid cycle (KG) and/or at the start of the subsequent drying cycle (TG) of the wash cycle (SG1), and that in the event that hot water from the external hot water supply is used for all water-conducting partial wash cycles of the wash cycle (SG1) carried out by a selected dishwasher programme, the heat exchanger (VB) is not filled with hot water (WW) at the end of the rinse aid cycle (KG) but instead remains empty throughout the duration of the drying cycle (TG) of this wash cycle.
2. Dishwasher according to at least one of the preceding claims, characterised in that an operator control device (20) is provided which enables manual selection of the operating mode.
3. Dishwasher according to at least one of the preceding claims, characterised in that the dishwasher (1) has a data interface (20a) which is provided for receiving operating data of the external hot water supply (WA), the programme control device (19) being embodied for automatic or manual selection of the operating mode based on received operating data.
4. Dishwasher according to at least one of the preceding claims, characterised in that the hot water inlet device (51) comprises a hot water valve (6) and the cold water inlet device (52) comprises a cold water valve (8), the hot water valve (6) and the cold water valve (8) being controllable independently of one another by means of the programme control device (19).
5. Dishwasher according to claim 4, characterised in that the hot water valve (6) is arranged at an upstream end of a hot water hose (7) and embodied such that said valve can be fastened to a connection member (WH) of the external hot water supply (WA), and/or that the cold water valve (8) is arranged at an upstream end of a cold water hose (9) and embodied such that said valve can be fastened to a connection member (KH) of the external cold water supply (KA).
6. Dishwasher according to at least one of the preceding claims, characterised in that a linkage member (10) is provided externally from the dishwasher (1) and that the downstream end of the hot water hose (7) of the hot water inlet device (51) and the downstream end of the cold water hose (9) of the cold water inlet device (52) are linkable via the linkage member (10), in a fluid-conducting manner, to a common inlet hose (11) which can be or is coupled to a device-side connection member (12), which is, in particular, fixed to the housing.
7. Dishwasher according to at least one of claims 1 to 5, characterised in that a linkage member (10) is provided at the dishwasher, particularly internally, wherein the hot water inlet device (51) can be or is coupled to the first input and the cold water inlet device (52) can be or is coupled to the second input of said linkage member.
8. Dishwasher according to at least one of the preceding claims, characterised in that the external hot water supply (WA) is partially or wholly fed by a thermal solar installation (TSA).
9. Method for controlling at least one wash cycle (SG1) of a dishwasher, particularly a household dishwasher (1), which is embodied in particular according to at least one of the preceding claims, comprising a hot water inlet device (51) for the intake of hot water (WW) from an external hot water supply (WA), and a cold water inlet device (52) for the intake of cold water (KW) from an external cold water supply (KA), by means of at least one wash programme (SP1) of a programme control device (19), wherein in a first operating mode at least one wash programme (SP1) is activated by the programme control device (19), wherein, for at least one partial wash cycle (RG, KG) of the wash cycle (SG1) implemented thereby, hot water (WW) is specifically drawn from the external hot water supply (WA), and wherein, in a second operating mode, the programme control device (19) activates at least one wash programme (SP2), wherein, for at least one partial wash cycle (TG) of the wash cycle (SG1) implemented thereby, exclusively cold water (KW) is specifically drawn from the external cold water supply (KA), characterised in that the programme control device (19) controls the hot water inlet device (51) and the cold water inlet device (52) such that in the first operating mode for a first group of one or more partial wash cycles (RG, KG) of the wash cycle (SG1) performed by a selected dishwashing programme (SP1), for each of which a specific wash bath hot water temperature (ST) higher than the cold water temperature (KT) of the cold water (KW) from the external cold water supply (KA) is required, hot water (WW) can be fed from the external hot water supply (WA) by means of the hot water inlet device (51) into the wash chamber (2), specifically to the partial wash cycle, and that for a second group of one or more partial wash cycles (VG, ZG) of the wash cycle (SG1) of the selected dishwashing programme (SP1), for which the cold water temperature (KT) of the cold water (KW) from the external cold water supply (KA) is sufficient or required as the respective specific wash bath hot water temperature (ST), cold water (KW) can be fed from the external cold water supply (KA) by means of the cold water inlet device (52) into the wash chamber (2), specifically to the partial wash cycle, wherein a heat exchanger which is present externally, in particular in the form of a water pocket or a storage tank (VB), which is attached to a wall, in particular side wall, of the wash chamber (2) in a heat-transmitting manner, is filled with cold water (KW) from the external cold water inlet device (52) at the end of the rinse aid cycle (KG) and/or at the start of the subsequent drying cycle (TG) of the wash cycle (SG1), and that in the event that hot water from the external hot water supply is used for all water-conducting partial wash cycles of the wash cycle (SG1) performed by a selected dishwashing programme, the heat exchanger (VB) is not filled with hot water (WW) at the end of the rinse aid cycle (KG) but instead remains empty throughout the duration of the drying cycle (TG) of this wash cycle.

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