EP2229866A2 - Dishwasher with a freshwater reservoir - Google Patents

Abstract

The dishwasher (1) has a control device (14) to call a set of wash programs for controlling a wash cycle for a set of washing items to be washed. A fresh water inlet device (5) receives fresh water from an external cold water supply e.g. cold water pipe. A fresh water reservoir (8) is filled with fresh water by the fresh water inlet device, where the preset volume of the fresh water is stored in the fresh water reservoir that is sufficient to cover fresh water requirement of the wash cycle in the wash programs. The reservoir is made of polypropylene.

Description

The present invention relates to a dishwasher, in particular a domestic dishwasher, with a control device in which one or more wash programs for controlling a wash cycle for washing items to be called, and with a fresh water inlet device for receiving fresh water from an external cold water supply.

In known household dishwashers to be washed dishes in a rinsing process, also called rinse, automatically cleaned with the aid of rinse water after a wash program. For this purpose, a plurality of washing programs are usually stored in a control device, one of which is called in each case and used to control the rinse cycle. The selection and the start of a washing program is generally carried out by an operator, but can also be done automatically by means of a control device. The further course of a rinse cycle is then automatically controlled by the control device. In this case, a rinsing program usually provides for a plurality of successive partial rinses, the rinse water being provided with cleaning and / or additives as a function of the course of the respective rinsing program and being brought to a temperature which is favorable for the respective partial rinse cycle.

In order to cover the water requirement for carrying out a wash cycle, known dishwashers have a fresh water feed device for receiving fresh water. Such fresh water feed devices are intended to be connected to an external fresh water supply, which provides pressurized fresh water. This may, for example, be a water pipe installed on the building side. While in the US such dishwashers prevail, which are intended to be connected to an external hot water supply, such dishwashers are common especially in Europe, which are designed for connection to an external cold water supply.

A typical rinse in a European style domestic dishwasher includes, in particular, in this order of time, a pre-rinse, a cleaning cycle, an intermediate rinse, a rinse cycle and a drying cycle.

After the start of a wash program, the prewash cycle is started, wherein fresh water from the external cold water supply is first introduced into the washing container of the dishwasher by a corresponding activation of the fresh water feed device. By appropriate control of a circulation pump, the fresh water is then circulated as rinse water, so as to free the dishes from coarse contamination. Usually, the rinse water of the pre-wash cycle is not heated. After a predetermined time then at least a portion of the now contaminated rinse water is pumped out under appropriate control of a drain pump and the pre-wash cycle ends.

At the beginning of the subsequent cleaning cycle, further fresh water from the external cold water supply is introduced into the rinsing container with renewed activation of the fresh water feed device. This is heated by driving the heater in a heating phase of the cleaning cycle. During the heating phase of the cleaning cycle, cleaning agent, which is now located in the rinsing container, is as a rule added to cleaning agent via a detergent dosing device controlled by the control device. Furthermore, during the heating phase of the cleaning cycle, the circulation pump is controlled so that the rinse water is circulated so as to be able to remove stubborn dirt from the dishes. When the temperature of the rinse reaches a predetermined value by the rinse program, this is detected by the sensor for the temperature of the rinse cycle, after which the control device switches off the heater. Subsequent to the now completed heating phase of the cleaning cycle, a post-cleaning phase or post-washing phase of the cleaning cycle is carried out with a predetermined period of time during which the rinsing water is circulated further. At the end of the post-wash phase, the drain pump is controlled again, so that at least a portion of the rinse water of the cleaning cycle is pumped out.

At the beginning of the subsequent intermediate rinse cycle, the rinse water is replenished in the rinse tank via the fresh water intake device. Usually, the rinse water of the intermediate rinse cycle is not heated, but circulated by means of the circulation pump. Due to the intermediate rinse, detergent residues in particular can be removed from the items to be washed. After a predetermined period of time, the rinse water of the intermediate rinse cycle, which now comprises detergent residues, is at least partially pumped out.

At the beginning of the subsequent rinse cycle the fresh water inlet device is controlled again to bring fresh water into the washing. This is mixed with rinse aid by a rinse aid addition device, heated by activation of the heating device and circulated by appropriate activation of the circulation pump. Upon reaching a designated temperature, the circulation pump and the heater is turned off. Furthermore, the rinse water is pumped out via the drain pump and the rinse cycle finished. The rinse cycle is used in particular to avoid staining on the cleaned items to be washed, which is achieved essentially by the chemical properties of the rinse aid. Furthermore, the rinse cycle is generally used to prepare the items to be washed for the subsequent drying cycle by bringing this to a relatively high temperature.

During the subsequent drying cycle, in which no new rinse water is introduced into the washing, evaporates due to the high temperature of the dishes by so-called "Eigenwärmekonvektion" the still adhering rinse water. This condenses then especially on the walls of the washing and collects in a lower portion of the washing. From there, the rinse water is pumped out after a predetermined time by means of the drain pump and the drying cycle is completed.

The illustrated basic sequence of a typical rinse cycle can be modified in many ways. For example, different time constants or different temperatures can be specified. It is also possible to omit individual partial rinses, such as, for example, the pre-rinse cycle and / or intermediate rinse cycle, or individual partial rinses, such as, for example, the cleaning cycle, several times in a row. In this way it is possible to adapt the intended course of the wash cycle to different applications.

Selecting a suitable wash program may significantly improve the efficiency of wash items cleaning. The efficiency corresponds to the ratio of the scavenging result achieved by means of a rinse cycle and the effort required for this, that is to say the energy requirement, the water requirement and / or the time required for the respective rinse cycle.

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 more efficient household dishwashers.

A disadvantage of the known dishwashers is that they no longer meet the current need for efficiency.

The object of the present invention is to provide a dishwashing machine, in particular a household dishwasher, with a higher efficiency.

This object is achieved in a dishwasher, in particular domestic dishwasher, of the kind mentioned in that a fillable by the fresh water inlet device with fresh water fresh water tank is provided in which such a quantity of fresh water can be stored, which covers the fresh water demand of a rinse cycle at least one of the washing programs ,

The temperature of a household cold water source such as cold water pipe is usually below an ambient temperature in which a dishwasher is operated. Through the fresh water storage, it is possible to initiate the fresh water needed for a rinse from the cold water supply in the fresh water tank and store it there before it is removed again for the implementation of the rinse cycle from the fresh water tank. During this residence time in the fresh water tank, the fresh water can heat by absorbing heat from the environment to a use temperature that is higher than its original filling temperature when filling in the fresh water tank. In particular, the fresh water fed into the fresh water storage tank can warm up to ambient temperature if it has spent a sufficiently long residence time in the fresh water storage tank. For example, it has the ambient temperature when it is removed from the fresh water tank for the Teilspülgange a newly started wash program after the end of a wash program the day before on the following day. In this way, preheated fresh water is available for the rinse cycle of the respective selected rinse program, which can be brought from its original filling temperature to a higher operating temperature without additional heating even by utilizing the ambient heat in the installation room of the dishwasher. Ideally, the preheated fresh water thus has a temperature which corresponds to the ambient or room temperature. This may for example be 8 ° C to 10 ° C above the temperature of the cold water supply.

The storage capacity of the fresh water tank is dimensioned so that the amount of fresh water storable in the fresh water tank at least covers the water requirement for a complete rinse cycle provided by one of the stored rinse programs. This washing program can advantageously be described to an operator as being particularly energy-efficient, e.g. be indicated by an extra economy button or energy efficiency button and / or display. In this way, it is ensured that preheated fresh water can be kept available for each fresh water-consuming partial rinse cycle of the rinse cycle.

This results for unheated water-carrying partial rinses of the controlled according to the respective wash program rinse a higher rinse temperature, which increases their cleaning effect at the same extent constant energy demand. With heated water-conducting partial rinsing results in an energy savings, which is based on the fact that less heat must be supplied to the preheated fresh water in order to achieve the intended rinse temperature.

Due to the higher average temperature during a wash cycle with, in particular alone by the ambient heat, preheated water also results in a higher thermal cleaning effect. This makes it possible in many cases to shorten the intended duration of a wash program, which can lead to a time savings, but also to a further energy savings due to a shortened running time of the circulation pump.

Overall, the dishwasher according to the invention enables more efficient operation in at least one washing program.

According to a preferred embodiment of the invention, such a quantity of fresh water can be stored in the fresh water tank, which covers the fresh water requirement of a rinse cycle in several of the washing programs. In this case, the advantages according to the invention can be realized with several rinsing programs. This allows the selection of a suitable for the particular application wash program from a plurality of efficiently executable wash programs.

According to a particularly preferred embodiment of the invention, such a quantity of fresh water can be stored in the fresh water tank, which covers the fresh water requirement of a rinse cycle in each of the rinse programs. In this case, it is ensured that each of the scheduled rinse programs can be performed efficiently.

According to an expedient development of the invention at least 8 liters, preferably at least 12 liters and more preferably at least 16 liters of fresh water can be stored in the fresh water storage. In such a design of the fresh water tank, a significant increase in efficiency of the dishwasher can be achieved.

According to an advantageous development of the invention, the fresh water reservoir is arranged on the outside of at least one wall, in particular side wall, of the washing container of the dishwasher. As a result, the dishwasher can be delivered and operated as a compact unit with integrated fresh water storage. In particular, the fresh water storage can expediently in the intermediate space between an outer housing, if this is present, and at least one wall, in particular side wall, of the inside arranged Spülbehälters the dishwasher and thus be provided within a housing. In this way, damage-prone, external, electrical and / or hydraulic connections between the fresh water storage tank and other components of the dishwasher are avoided. Rather, the compounds, as well as the fresh water storage itself, protected by the housing of the dishwasher. In addition, the space requirement compared to a conventional dishwasher remains unchanged, so that the dishwasher can be easily integrated into a kitchen unit with standard dimensions. Furthermore, no intervention in the design of the dishwasher is required.

According to an expedient development of the invention, the fresh water reservoir is thus arranged between a possibly existing housing and a rinsing container. As a rule, there are unused rooms in a dishwasher between their housing and washing containers. These are, for example, between a side wall of the washing and a side wall of the housing, which are substantially parallel. In such a space, for example, a simple to produce, flat parallelepiped fresh water storage can be used. It thus preferably has at most one cross-sectional width which corresponds to the gap width between the side wall or rear wall of the washing container and the outer housing. The rinse tank is also suitably sufficiently stable designed to carry a filled fresh water storage. In this way it is possible to attach the fresh water storage directly to the washing, which simplifies the construction of the dishwasher.

According to a particularly preferred embodiment of the invention, insulating means are provided which counteract a heat transfer and / or a sound transmission between washing and fresh water storage. In this way it can be prevented that the fresh water contained in the fresh water reservoir withdraws a substantial amount of heat from the washing container during a heating phase of a rinse cycle, which would lead to a higher heating requirement. This can an improvement in the energy efficiency of the dishwasher can be effected. In addition, a lower noise emission during operation of the dishwasher can be achieved, which benefits the comfort.

According to an expedient development of the invention, the fresh water reservoir is a plastic part, in particular of polypropylene. Such fresh water storage can be produced for example by means of suitable extrusion or casting process with little manufacturing effort. In addition, reservoirs made of plastic have a certain flexibility, so that their shape can be adapted within certain limits to the available installation space. This circumstance allows a particularly efficient use of the available installation space.

According to a particularly preferred embodiment of the invention, the fresh water inlet device on a controllable by the control device control valve for filling the fresh water storage, wherein the control valve is controlled so that the fresh water storage is filled at and / or after completion of a wash program. This ensures that the fresh water tank is filled with fresh water in a pause or in a dwell period between two rinsing programs, so that at the beginning of the subsequent rinse program fresh water with room temperature or at least near room temperature is available.

According to an expedient development of the invention, the control valve is controlled so that a filling of the fresh water storage takes place during a final fresh water consuming Teilspülgangs a wash program. In this way, the time between the introduction of the fresh water into the fresh water storage and the discharge of the fresh water from the fresh water storage can be maximized, so that the fresh water withdrawn at low temperature from the cold water supply can heat up significantly even if two rinses are performed immediately after each other ,

The last fresh water consuming partial rinse cycle of a rinse program is usually a rinse cycle. If in this case the fresh water tank is refilled immediately after the removal of the fresh water required for the rinse cycle, the newly introduced fresh water can already during the remaining duration of the rinse cycle and during the subsequent drying cycle, which increases the efficiency of the dishwasher, especially when following the current rinse without a longer break another rinse is performed.

According to an advantageous development of the invention, the control device is associated with a sensor for detecting the amount of fresh water stored in the fresh water reservoir. In this way, the introduction of fresh water into the fresh water storage and / or the discharge of fresh water from the fresh water storage can be controlled as needed.

According to a particularly preferred embodiment of the dishwasher according to the invention, the fresh water storage is designed so that fresh water can reach by its weight by a controllable flow into the washing. The controllable sequence can, for example, have an electrically actuatable valve which is controlled by the control device of the dishwasher. As a result, it is possible in a simple manner, fresh water in the fresh water storage controlled initiate into the washing. A funding, such as a pump, is usually not required.

According to an advantageous embodiment of the invention, the fresh water storage on an overflow, which opens into the washing. In this way, leakage of fresh water from the dishwasher can be prevented in the event of a fault, for example in the event of a fault in the area of the fresh water feed device or of the outflow of the fresh water reservoir.

According to an advantageous embodiment of the invention, the fresh water inlet device is associated with a free flow path. The free flow path can be arranged for example in the fresh water tank. Due to the free flow path is a, in particular due to hygiene regulations inadmissible, sucking back of fresh water in the direction of the cold water supply is avoided, resulting in could occur due to dynamic processes temporary negative pressure in the cold water supply. In this way, in particular a too low fresh water level can be avoided in the fresh water tank.

Figur 1

eine schematisierte räumliche Darstellung eines Ausführungsbei- spiels einer erfindungsgemäßen Geschirrspülmaschine;

Figur 2

ein Blockschaltbild der Geschirrspülmaschine von Figur 1;

Figur 3

ein vorteilhaftes Funktionsdiagramm zur Erläuterung der Funktion einer erfindungsgemäßen Geschirrspülmaschine.

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

FIG. 1

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

FIG. 2

a block diagram of the dishwasher of FIG. 1 ;

FIG. 3

an advantageous functional diagram for explaining the function of a dishwasher according to the invention.

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 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 washing dishes arises. 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.

On the back of the dishwasher 1 a schematically represented fresh water inlet device 5 is arranged. This has a fresh water connection piece 6, to which a connection hose 7 is connected. The connecting hose 7 is provided in an intended manner to an external cold water supply, especially cold water pipe, KH connected. The connection is usually made to a cold water tap KH provided on the building side.

Furthermore, the dishwasher 1 according to the invention has a fresh water storage 8. In this case, the fresh water inlet device 5 in the FIG. 1 not shown on components, which make it possible to direct fresh water from the cold tap KH in the fresh water storage 8. The fresh water storage 8 is intended to hold fresh water for a complete rinse cycle for washing dishes. It allows the dishwasher 1 to receive the fresh water needed for a complete rinse even before the rinse cycle is carried out. As a result, the fresh water, which is provided by the cold water supply KH, for example, at a temperature in the range of 10 ° C to 15 ° C, until it is used as rinse water to room temperature, which typically 20 ° C to 25 ° in the installation room of the dishwasher is. In this way, the energy required to bring the rinse water to a designated rinse temperature, which may be at least in phases up to 50 ° C. or more during a rinse, decreases. The fresh water introduced into the fresh water reservoir can be brought all the more by natural heat energy exchange with the environment to a temperature above its original supply temperature, in particular the more likely to assume the ambient temperature, the longer his residence time in the fresh water storage. So it takes after a sufficient waiting time after its introduction into the fresh water storage by itself from heat intake from the environment of the installation of the dishwasher a filling or feed temperature for filling in the respective Teilspülgang the selected Geschirrspülprogramms, which is higher than its original Zufülltemperatur Zufüllen lies in the fresh water tank.

The fresh water storage 8 is arranged in the interior of the housing 4 of the dishwasher 1, so that the external dimensions of the dishwasher 1 according to the invention do not differ from a conventional dishwashing machine. This makes it easily possible to integrate the dishwasher 1 according to the invention in a kitchen unit with conventional dimensions.

The fresh water reservoir 8 is preferably arranged in a space unused in a conventional dishwasher between a side wall 9 of the washing container 2 and a side wall 10 of the outer housing 4 of the dishwasher 1 running essentially parallel thereto. The fresh water storage 8 is formed as a very flat cuboid whose dimensions are adapted to the available space in order to use this efficiently. Possibly. the outer housing 4 can also be omitted. This may be particularly useful in a built-in dishwashing machine, e.g. integrated into an installation niche of a kitchen cabinet.

While the washing container 2 may be made of stainless steel, the fresh water reservoir 8 is preferably made of plastic. The fresh water storage 8 may in particular consist of polypropylene, which is a cheap and easy to process plastic. Thus, the fresh water reservoir 8 can be produced in a simple manner by extrusion processes or casting processes. In particular, when the fresh water reservoir 8 is filled, it nestles due to its material-related flexibility to the side wall 9 of the washing compartment 2 and to the side wall 10 of the housing 4. As a result, the available space is optimally utilized, so that a particularly large amount of fresh water can be stored. The fresh water storage 8 can be fastened by means not shown directly on the washing container 2, since this is usually sufficiently stable to carry a fully filled fresh water storage 8. In difficult space conditions can also be provided that the fresh water tank 8 consists of several separate partial storage units, which are arranged in different areas of the dishwasher 1 and connected by pipes, pipes or the like.

In particular, it may also be expedient according to an alternative construction, if the fresh water storage is attached to the outside of the rear wall of the washing compartment 2.

In a lower region of the washing container 2, a pump pot 11 is provided. In the sump 11, a pump for circulating water in the washing container 2 is provided during a wash cycle. Furthermore, it is expedient in the sump 11 arranged a heater for heating the water located in the washing 2. Similarly, in the sump 11, a lye or sewage pump pump for pumping water, for example, at the end of a rinse cycle, provided. However, the various pumping functions can also be perceived by a single pump in conjunction with switchable valves. The sump 11 is connected to a waste water connection piece 12 via means not shown so that water from the washing compartment 2 via a connected to the wastewater connection piece 12 sewage hose 13 in a wastewater installation A, for example, a sewer pipe A, can be pumped.

The dishwasher 1 also has a control device 14, in which at least one wash program for controlling a sequence of a wash cycle is stored. The control device 14 is in the embodiment of FIG. 1 arranged inside the door 3 of the washing compartment 2. However, it could also be arranged at another location of the dishwasher 1, such as in the bottom module below the washing container.

Conveniently, 14 different rinse programs are stored in the control device, one of which is selectable for controlling a rinse by an operator in each case. The flushing programs may differ in the cleaning effect caused by them in order to achieve a matched to the degree of contamination of the items to be washed a rinse cycle. In particular, the number of sub-rinses provided in each case for a rinsing program can vary, which in many cases leads to the fact that the fresh water requirement, i. the total amount of fresh water to be filled depends on the particular rinse program used for a rinse cycle.

The fresh water storage 8 has a storage capacity such that the fresh water requirement for all partial rinses at least one of the rinse programs can be covered by the fresh water stored in the fresh water storage 8 fresh water. In this way, the energy required to carry out a wash cycle on the basis of this wash program for heating the wash water is reduced, so that the energy efficiency of the dishwasher 1 is improved. A further improvement in energy efficiency can be achieved if the storage capacity of the fresh water storage 8 is dimensioned so that the fresh water requirement of several or all of the washing programs can be covered by the stored fresh water storage 8 fresh water.

The storage capacity of the fresh water storage 8, for example, be at least 8 liters, which may be sufficient for a slightly dirty dishes in a washing program. Preferably, the storage capacity is at least 12 liters, which may be sufficient for a dishwashing machine 1 for a wash program for cleaning normal dirty dishes. Particularly preferably, the storage capacity is at least 16 liters, which usually covers the total fresh water requirement in a dishwashing program for heavily soiled dishes.

FIG. 2 shows a block diagram of the dishwasher of FIG. 1 , The fresh water inlet device 5 comprises a control valve 15, which is controllable by the control device 14. The control valve 15 of the fresh water inlet device 5 is arranged downstream of the fresh water connection piece 6. In this way, the inflow of fresh water into the fresh water reservoir 8 can be controlled by the control device 14. The energy required to fill the fresh water reservoir 8 is generally provided by the pressure prevailing in the cold water supply, in particular the cold water line, in which case no pump or the like is required for filling the fresh water reservoir 8.

Downstream of the control valve 15, a free flow path 16 is provided. In the free flow path 16 is a so-called pipe interruption, which serves to prevent (especially for reasons of hygiene) unauthorized sucking back of water from the dishwasher 1, if in the external cold water supply by dynamic processes, a negative pressure. In this way it is in particular prevented that, when the dishwasher is switched off, fresh water warmed to room temperature is sucked from the fresh water reservoir 8 back into the cold water supply, which could not then result in a later execution of a rinse cycle enough fresh water heated to room temperature is available and then colder fresh water must be used.

At the lower end of the fresh water reservoir 8, a controllable drain 17 is arranged, which opens into the washing compartment 2. The controllable sequence 17 includes a likewise controllable by the control device 14 control valve 18. When the control valve 18 is opened, fresh water flows through its weight in the washing 2. In this way, it is possible without a pump or the like, fresh water in the store 8 befindliches fresh water Depending on the selected wash program in the washing container 2 to conduct.

In order to prevent leakage of fresh water from the dishwasher 1 in the event of a fault, such as a malfunction of the control valve 18, the fresh water tank 8 is associated with an overflow 19, which opens into the washing compartment 2.

The control device 14 is connected to a sensor 21 for detecting the amount of fresh water stored in the fresh water storage 8. This allows in particular accurate control of the control valve 15 of the fresh water inlet device 5 when receiving fresh water from the cold water supply, so as to be able to set a desired level exactly. However, the signals of the sensor 21 can also be used to control the control valve 18 of the sequence 17 in order to accurately meter a discharge of fresh water from the fresh water storage 8 can.

Between the fresh water reservoir 8 and the washing container 2, a layer-like insulating means 22 is arranged, which reduces a heat transfer and / or a sound transmission between washing container 2 and fresh water storage 8. This prevents, on the one hand, that the fresh water present in the fresh water reservoir 8 extracts a considerable amount of heat from the rinsing container 2 during a heating phase of a rinse cycle, which would lead to a higher heating requirement. As a result, an improvement in the energy efficiency of the dishwasher can be effected. On the other hand, it allows a lower noise emission during operation of the dishwasher, which benefits the comfort.

The one or more electrical components disposed in the sump 11 are controlled by the controller 14. Thus, rinsing water located in the washing container 2 can be selectively heated, circulated via a spraying device 20 and pumped out via the waste water connecting piece 12 to the outside.

FIG. 3 illustrates an advantageous mode of operation of a dishwasher designed according to the design principle according to the invention. In FIG. 3 the curves MFW and TFW are shown on a common time axis t. The curve MFW represents the amount MFW of fresh water that is stored at a certain time in the fresh water tank. The amount of fresh water is relative to the maximum storable amount, ie relative to the storage capacity of the fresh water storage specified. The value 100% means that the fresh water tank is filled to the maximum, the value 0% that the fresh water tank is completely emptied. The storage capacity can be for example 15 liters. The curve TFW represents the temperature TFW of the water in the fresh water reservoir 2.

In FIG. 3 are a final phase of a first rinse SG1 and a second, temporally spaced with a break from the first rinse, later rinse SG2 shown. The rinses SG1 and SG2 are each automatically performed on the basis of a washing program selected by the operator. The respective rinsing program provides a pre-rinsing cycle VG, a cleaning cycle RG, an intermediate rinsing cycle ZG, a rinsing cycle KG and a drying cycle TG in successive succession as partial rinses. In each case, the control device controls all components of the dishwasher, in particular that in the FIG. 2 shown control valve 15 of the fresh water inlet device and also in the FIG. 2 It is self-evident that the advantages according to the invention can also be achieved with other, modified rinsing programs. For example, a wash program would be possible, which is on the pre-wash cycle Omitted VG and / or the intermediate rinse ZG. Likewise, a rinse program would be possible in which several cleaning cycles are provided.

At the beginning of the rinse cycle KG of the first, earlier rinse SG1 of the fresh water storage is still filled to about 40%. The temperature TFW of the fresh water in the fresh water storage corresponds substantially to the ambient temperature of the dishwasher, ie a room temperature TR of, for example, 22 ° C. Immediately after the beginning of the rinse cycle KG, the fresh water reservoir is taken off such an amount of fresh water, which is required for carrying out the rinse cycle KG. This amount may be, for example, 20% of the storable amount or 3 liters.

The rinse cycle KG is the last partial rinse cycle of the rinse cycle SG1, which requires fresh water. Therefore, the fresh water storage is completely replenished immediately after the fresh water removal for the rinse cycle to maximize the time between the filling of fresh water storage with fresh water and the withdrawal of fresh water in a subsequent rinse SG2. In this way, with the temperature TK of the cold water supply supplied fresh water, which is for example 14 ° C, until its removal maximum, in particular to a feed temperature for feeding into the washing, heat, which is higher than its original inlet temperature in the fresh water tank , It can even be higher than the ambient temperature or room temperature, since the water used in the rinse process is heated so much above room temperature that a perfect drying result for to be dried, cleaned items due to so-called Eigenwärmekonvektion the heated items and condensate on the opposite Washware colder walls of the washing can be achieved. This selection of the Zufüllzeitpunkts for adding fresh water in the fresh water tank is particularly advantageous if the time between the end of the first rinse SG1 and the second rinse SG2 is tight. However, embodiments are also conceivable in which the filling of the fresh water reservoir takes place later, for example during or subsequent to a final drying cycle TG of the rinse cycle SG1.

In the example of FIG. 3 The fresh water supplied from the cold water supply and the fresh water remaining in the fresh water storage mix approximately in a ratio of 4 to 1. Thus, the temperature TFW in the fresh water storage decreases sharply, but is still above the temperature TK of the cold water source. In this case, for example, a temperature of 16 ° C is established. Starting from this value, the temperature TFW in the fresh water storage increases during the remaining duration of the rinse cycle KG and during the subsequent drying cycle TG due to the higher ambient temperature TR. At the end of the drying cycle TG, in which no fresh water is removed from the fresh water storage tank, the temperature TFW in the fresh water storage tank may already be, for example, 19 ° C.

The temperature TFW increases after completion of the wash cycle SG1 until the beginning of a subsequent wash cycle SG2 on. With a longer break between the rinse cycles SG1 and SG2, which occurs quite frequently in practice, the temperature TFW in the fresh water storage at the beginning of the second rinse cycle SG2 has essentially reached or even exceeds room temperature TR. Therefore, if as in the embodiment of FIG. 3 a corresponding storage capacity of the fresh water storage is provided at the beginning of each fresh water consuming Teilspülgangs VG, RG, ZG and KG of the wash SG2 fresh water at least with room temperature TR, which is well above the temperature TK of the cold water supply available. In this case, about 20% of the capacity is taken from the fresh water storage tank at the beginning of each of the partial rinsing cycles VG, RG, ZG and KG.

In this way, results for the unheated water-conducting Teilspülgänge, so for example for the pre-wash VG and the intermediate rinse ZG, a higher rinse temperature than the original cold water temperature, which increases the cleaning effect of this Teilspülgänge with so far constant energy demand. In the heated water-conducting Teilspülgängen, so for example in the cleaning cycle RG and the Klarspülgang KG, results in an energy savings, which is based on the fact that less heat must be supplied to the preheated fresh water to those provided for the respective Teilspülgang Rinse temperature to achieve. In addition, due to the higher average temperature during the rinse with water that is preheated by the ambient heat at the location of the dishwasher and / or by one or more heat-up operations of one or more partial rinses of an earlier, prior rinse, this results in a higher thermal cleaning effect. This makes it possible in many cases to shorten the intended duration of a washing program, which can lead to a time savings, but also to an energy savings, for example, due to a shortened running time of the circulation pump.

In the example of FIG. 3 the fresh water tank is taken at the beginning of one of the partial rinses VG, RG, ZG and KG of the rinse SG2 about 20% of the total storable amount of fresh water. Thus, in the case of such a rinse SG2, approximately 20% of the maximum quantity always remains in the fresh water reservoir. Such a dimensioning of the storage capacity of the fresh water reservoir allows that even in a rinse, which is controlled by a further washing program, which provides an additional second cleaning cycle, the entire fresh water demand can be covered from the fresh water tank, which, for example, an efficient implementation of a rinse for stronger dirty dishes possible.

In summary, it can be stated that in an advantageously designed dishwasher, the fresh water for at least two partial rinses such as cleaning and rinsing, especially for an entire rinse, ie for all Teilspülgänge a Geschirrspülprogramms in a tank or fresh water storage can be kept. In this case, the fresh water by simple heat transfer from the environment, ie preferably without further heating, assume the ambient temperature of the installation room, especially the kitchen, in which or in the dishwasher is set up, so that for the (unheated) rinsing liquor, for example, a feed temperature such For example, of 23 ° C, which is higher in many cases, than the temperature at which the fresh water is obtained from a cold water pipe, which is for example 15 ° C. The energy that is additionally required to a certain process temperature of the wash liquor in each Teilspülgang the selected dishwasher program can therefore be lower than in the case without fresh water storage. Thus, an energy saving is possible.

It may be particularly expedient to perform the filling process of the fresh water storage tank during and / or immediately after the rinse cycle of a selected dishwasher program, in particular its last Teilspülgangs with additional heating process such as rinsing and / or subsequent drying process, so that the stored fresh water as much heat energy from the interior can accommodate the rinse tank. This has the advantage that a relatively short residence time of the fresh water in the fresh water tank can already be sufficient to bring it to a higher temperature than its original filling temperature. In this way, such preheated fresh water can also be used for a dishwasher program started immediately below, without it being necessary to wait for a minimum waiting time, as normally required for matching the fresh water temperature in the fresh water storage tank to the ambient temperature when the waste heat from the interior of the washing compartment is not utilized would.

LIST OF REFERENCE NUMBERS

1

dishwasher

2

rinse tank

3

door

4

casing

5

Fresh water inlet device

6

Fresh water connection piece

7

connecting hose

8th

Fresh water tank

9

Side wall washing container

10

Sidewall housing

11

sump

12

Sewage fitting

13

drain hose

14

control device

15

Control valve of the fresh water inlet device

16

free flow path

17

controllable process

18

Control valve of the controllable process

19

overflow

20

spraying

21

level sensor

22

insulating

A

sewage pipe

KH

Cold water supply, cold water tap

MFW

Amount of fresh water in freshwater storage

TFW

Temperature of fresh water in fresh water storage

TR

room temperature

TK

Temperature of cold water supply

SG

rinse

KG

rinse cycle

TG

drying cycle

VG

prewash

RG

cleaning cycle

ZG

intermediate rinsing

Claims (17)

Dishwasher, in particular domestic dishwasher, with a control device (14), in which one or more wash programs for controlling a wash cycle (SG) can be called for washing dishes, and with a fresh water inlet device (5) for receiving fresh water from an external cold water supply (KH) , characterized in that by the fresh water inlet means (5) can be filled with fresh water fresh water tank (8) is provided, in which such a quantity of fresh water can be stored, which covers the fresh water requirement of a wash cycle (SG) at least one of the washing programs. Dishwasher according to claim 1, characterized in that in the fresh water tank (8) such a quantity of fresh water can be stored, which covers the fresh water requirement of a wash cycle (SG) one of several washing programs. Dishwasher according to one of the preceding claims, characterized in that in the fresh water tank (8) such a quantity of fresh water can be stored, which covers the fresh water requirement of a wash cycle (SG) in each of the washing programs. Dishwasher according to one of the preceding claims, characterized in that in the fresh water tank (8) at least 8 liters, preferably at least 12 liters and more preferably at least 16 liters of fresh water are storable. Dishwasher according to one of the preceding claims, characterized in that the fresh water reservoir (8) on the outside at least one wall (9) of a washing container (2) is arranged. Dishwasher according to one of the preceding claims, characterized in that the fresh water reservoir (8) in the space between an outer housing (4) and an internally disposed washing compartment (2) is arranged. Dishwasher according to one of the preceding claims, characterized in that insulating means (22) are provided, which counteract a heat transfer and / or a sound transmission between washing (2) and fresh water storage (8). Dishwasher according to one of the preceding claims, characterized in that the fresh water reservoir (8) is a plastic part, in particular made of polypropylene. Dishwasher according to one of the preceding claims, characterized in that the fresh water inlet device (5) by the control device (14) controllable control valve (15) for filling the fresh water reservoir (8), wherein the control valve (15) is controlled so that the fresh water tank (8) is filled at and / or after completion of a wash cycle (SG1). Dishwasher according to one of the preceding claims, characterized in that the control valve (15) is controlled so that a filling of the fresh water reservoir (8) takes place during a last fresh water consuming Teilspülgangs (KG) a rinse cycle (SG1). Dishwasher according to one of the preceding claims, characterized in that the control device (14) is associated with a sensor (21) for detecting the actual amount (MFW) of the fresh water in the fresh water tank (8). Dishwasher according to one of the preceding claims, characterized in that the fresh water reservoir (8) is designed so that fresh water can reach by its weight by a controllable flow (17) in the washing compartment (2). Dishwasher according to one of the preceding claims, characterized in that the fresh water reservoir (8) has an overflow (19), which opens into the washing compartment (2). Dishwasher according to one of the preceding claims, characterized in that the fresh water inlet device (5) is associated with a free flow path (16). Dishwasher according to one of the preceding claims, characterized in that is used as fresh water of the cold water supply (KH) raw water a cold water source, treated service or gray water a water treatment plant, cistern water a cistern system, well water a well lift system, and / or other cold water supply device. Dishwasher according to one of the preceding claims, characterized in that the amount of fresh water stored in the fresh water reservoir (8) corresponds at least to the total amount of water required for the complete passage of all partial rinse cycles of the respective selected rinse program. Dishwasher according to one of the preceding claims, characterized in that the respective selected washing program for its rinse at least two partial rinses, in particular cleaning and rinsing comprises.

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