DE102013204003A1 - Dishwasher with a Sorptionstrockenvorrichtung and an opening device for their door - Google Patents

Abstract

A dishwasher is provided, in particular a domestic dishwasher (1), with a control device (2) for controlling a wash cycle for washing dishes with at least one wash program (SP) stored in the control device (2), with a wash chamber (3) for holding the wash ware during the rinse cycle, with a door (5) for closing the rinsing chamber (3), to which an opening device (14) which can be controlled by the control device (2) is assigned, wherein at least one rinsing program (SP) can be carried out by the control device (2), which comprises a drying step (TS) for drying the dishes, which provides for opening the door (5) by actuation of the opening device (14) by the control device (2), wherein the washing program (SP) is designed such that during the drying step (TS) a drying of an internal air (IL) in the washing chamber (3) before opening the door (5) by means of a through the Steue pure direction (2) controllable Sorptionstrockenvorrichtung (15) is provided.

Description

The invention relates to a dishwasher, in particular a domestic dishwasher, with a control device for controlling a wash cycle for cleaning items by at least one stored in the control device washing program, with a washing chamber for receiving the dishes during the wash cycle, with a door for closing the wash chamber, which a is associated with controllable opening means by the control device, wherein at least one washing program is executed by the control device, which comprises a drying step for drying the dishes, which provides for opening the door by an actuation of the opening means by the control device.

It is known to automatically open a door for closing the rinsing chamber in a program-controlled dishwasher during a drying step of the rinse program for drying the rinsing chamber, so as to achieve a mixing of the moist inside air of the rinsing chamber with a generally drier outside air, so as to increase the drying result improve.

A disadvantage of such a dishwasher is that after opening the door moist interior air can escape from the washing chamber, which can lead to condensation on the adjacent kitchen equipment.

The object of the invention is to improve such a dishwasher.

The object is achieved in a dishwasher of the type mentioned above in that the wash program is designed so that during the drying step drying of an internal air in the washing chamber is provided before opening the door by means of a controllable by the control device Sorptionstrockenvorrichtung.

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

In modern dishwashers, a control device is generally provided, in which one or more wash programs for controlling a wash cycle for cleaning items to be washed are stored. The control device may in particular be designed as a sequence control device. The sequence control device is designed such that it automatically controls a rinse cycle according to a rinse program usually selected by an operator. Within the scope of the invention, the control device may additionally or independently thereof also control or other settings of one or more operating parameters, such as e.g. perform the control of the speed of the circulation pump or the control of the heating temperature of a heater of the dishwasher. As a general rule, the term control device is understood to mean a sequence / control device setting, in particular for controlling and / or regulating, and / or monitoring one or more operating parameters.

The water required for carrying out rinses can be taken up in known dishwashers via a water inlet device, which can receive water, for example, from a water supply installed on the building side.

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

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

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

In a dishwasher with a so-called self-heat drying, another task of the 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 final drying step, water droplets adhering to the hot items evaporate and are deposited on the inside of the rinse container due to the lower temperature (compared to the temperature of the items to be warmed up).

The rinsing chamber is usually limited by a rinsing container and can be closed by a door in such a way that the rinsing chamber is substantially watertight and airtight. For loading the rinsing chamber with items to be washed or for removing items to be washed from the rinsing chamber, the door of the rinsing chamber can be opened. The door can in this case be mounted in particular displaceable or pivotable.

In the dishwasher according to the invention the door for closing the rinsing chamber is associated with an controllable by the control device opening means, wherein at least one rinsing program is executed by the control device, which comprises a drying step for drying the dishes, the opening of the door by an actuation of the opening device by the Provides control device. As a result, a mixing of the moist inner air of the washing chamber is achieved with a generally drier outdoor air and thus the drying result can be improved, which improves the drying efficiency of the dishwasher.

According to the invention, the rinsing program is designed such that, during the drying step, drying of internal air in the rinsing chamber precedes the automatic, i.e. opening the door by means of an opening device by means of a controllable by the control device Sorptionstrockenvorrichtung or Sorptionstrocknungseinrichtung is provided. According to the invention, the drying cycle is composed of a predrying drying by sorption drying and a door opening step arranged chronologically in which interior air can escape from the dishwashing chamber into the environment of the dishwasher through a door opening gap and dry outside air can flow into the dishwashing chamber in relation to the interior air. Through this door opening step any remaining moisture remaining from the items to be washed can be removed after the sorption drying cycle.

A sorption drying device comprises a sorption column with a reversibly dehydratable material. The operating principle of a sorption drying device is that during the drying step, water molecules are attached to the reversibly dehydratable material, wherein the reversibly dehydratable material heats up. The reversibly dehydratable material may be, for example, zeolite, polyacrylic acid, or a superabsorbent such as e.g. Lithium chloride, in exceptional cases to another medium with sorptive properties. As a result, an air flow generated, for example, by a blower can be dried, heated by the heat thus generated and introduced into the washing chamber, where it absorbs moisture and thus dries the inside air in the washing chamber.

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

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

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

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

By now the inside air is dried in the washing chamber before opening the door by means of Sorptionstrockenvorrichtung, in particular pre-dried, the proportion of water molecules in the interior air in the washing chamber can be reduced such that the exiting through the open door interior air is so dry that condensate formation on adjacent objects is reduced or prevented. In particular, such a strong condensation on a worktop arranged above the dishwasher or on an adjacent kitchen cabinet can be avoided, so that both mildew and swelling, which usually consist of fiber material or wooden worktops and kitchen cabinets, can be avoided.

According to a preferred development of the invention, it is provided that the drying of the internal air takes place in such a way that the relative humidity of the inside air is less than 100%, preferably less than 90%, particularly preferably less than 80%. The relative humidity is expressed as a percentage of the proportion of water vapor in the indoor air based on the maximum possible proportion of water vapor to the indoor air. At the indicated values, condensate formation on adjacent objects can be effectively reduced or prevented. In order to maintain the values, a relative humidity sensor could be provided which could be connected to the controller for communicating corresponding readings. In many cases, however, it is sufficient if a device-type-dependent period of time for drying the inside air is determined in laboratory tests, at which the values are reached. This device type-dependent period of time can then be stored in the wash program and used in the control of the wash cycle, whereby the observance of the values can be ensured even without a special sensor.

According to a preferred embodiment of the invention, it is provided that the rinsing program is designed such that the drying step is followed by an unheated, water-conducting rinsing step, in particular a final-rinse step. An unheated water-conducting rinsing step is understood to be a rinsing step in which the water used is not actively heated. In this way, the temperature of the inside air when opening the door can be lowered, so that the inside air less cools on exiting the rinsing chamber, which in turn means that the relative humidity of the inside air increases less upon exiting. As a result, the condensation can be further reduced.

According to a preferred embodiment of the invention, it is provided that the door is opened at the earliest when a temperature of the internal air is below 50 ° C, preferably below 40 ° C, more preferably below 30 ° C. By prior heated rinsing steps, but also by the use of sorption drying device for drying the inside air, the temperature of the inside air during the drying step is generally well above the temperature of the outside air, which is typically in the range of 15 ° C to 25 ° C. Therefore, after opening the door exiting internal air usually cools down, which leads to an increase in the relative humidity. At the specified maximum temperatures for the internal air before opening the door, however, this effect can be kept low, so that condensation is counteracted. To comply with the values, a sensor could be provided for measuring the temperature of the internal air, which could be connected to the control device for the transmission of corresponding measured values. In many cases, however, it is sufficient if laboratory-type-dependent parameters for the drying step are determined at which the intended values are reached. These device-type-dependent parameters may relate, for example, to the timing of the rinse cycle and / or the performance of the sorption drying device. They can then be stored in the rinsing program and used in the control of the rinse cycle, whereby the observance of the values can be ensured even without a special sensor.

According to a preferred development of the invention, it is provided that the sorption drying device has a fan controllable by the control device for generating an air stream consisting of internal air which is guided through a sorption column of the sorption device, wherein the rinsing program is designed so that the fan after opening the door is on for a programmable time interval. By operating the fan after opening the door, a quick mixing of the inside air with outside air can be achieved. In this way, the drying efficiency can be improved, since the drying effect of the outside air starts very quickly. In addition, it can be achieved that hardly any pure interior air exits the rinsing chamber, but substantially mixed with outside air inside air, which further counteracts the formation of condensation.

According to a preferred embodiment of the invention, it is provided that the program-controlled time interval immediately, so without significant pause, followed by the opening of the door. In this way, the mixing of the internal air with the outside air can be done very quickly.

According to a preferred embodiment of the invention, it is provided that the duration of the program-controlled time interval is at least 15 s, preferably at least 30 s, more preferably at least 60 s, and / or at most 360 s, preferably at most 180 s, particularly preferably at most 90 s. At the specified minimum values, an effective acceleration of the mixture of the internal and external air can be ensured. At the specified maximum values, the noise emission resulting from the operation of the fan when the door is open can be minimized.

According to a preferred embodiment of the invention, it is provided that the opening of the door is such that between a washing chamber delimiting the washing compartment and the door, a gap is formed whose maximum width is at least 2 mm, preferably at least 4 mm, more preferably at least 6 mm, and / or at most 40 mm, preferably at most 30 mm, particularly preferably at most 20 mm. At the specified minimum values, an effective mixture of the inside air with the outside air can be ensured. At the specified maximum values, a risk to persons can be excluded when opening the door.

According to a preferred embodiment of the invention, it is provided that a wastewater pump is provided for pumping out water, wherein the washing program is designed so that the wastewater pump is switched on at least temporarily and exclusively before opening the door during the drying step. By at least temporarily switching on the wastewater pump during the drying step residual water can be removed from the washing chamber, so that it does not evaporate. As a result, the drying efficiency of the dishwasher can be further improved. In addition, so the formation of condensation can be further counteracted. By pumping out the residual water by means of the sewage pump only before opening the door, the noise emission of the dishwasher can be minimized.

Furthermore, the invention relates to a method for operating a dishwasher with a control device for controlling a wash cycle for cleaning items by at least one stored in the control device washing program, with a washing chamber for receiving the dishes during the wash, with a door for closing the washing chamber, which an opening device controllable by the control device is assigned, wherein the control device carries out at least one washing program, which comprises a drying step for drying the dishes, in which the door is opened by the opening device being actuated by the control device.

In the method according to the invention, it is provided that the rinsing program is designed such that, during the drying step, an internal air is dried in the rinsing container before the door is opened by means of a sorption drying device that can be controlled by the control device.

The inventive method allows a high drying efficiency of the dishwasher and counteracts unwanted formation of condensation.

Embodiments and further developments of the method according to the invention are explained in the description of the claimed dishwasher.

The above-explained and / or reproduced in the subclaims advantageous embodiments and refinements of the invention can - in addition to z. B. in cases of clear dependencies or incompatible alternatives - individually or in any combination with each other.

The invention and its advantageous embodiments and further developments and advantages thereof are explained in more detail below with reference to drawings. They show, in each case in a schematic outline sketch:

1 An embodiment of a domestic dishwasher according to the invention in a schematic three-dimensional view,

2 a functional diagram of the dishwasher of 1 and

3 an exemplary operation of the dishwasher according to the invention the 1 and 2 ,

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

1 shows a schematic spatial representation of a dishwasher according to the invention 1 , This has a control device for controlling the course of a washing program. In the control device designed in particular as a flow control device 2 Various washing programs can be stored, which can be selected by an operator. The dishwasher 1 also has a rinsing chamber 3 which is through a washing container 4 limited and through a door 5 is closable, so with the door closed 5 a substantially water and airtight rinsing chamber 3 for rinsing dishes. The washing container 4 is inside a case 6 the dishwasher 1 arranged, which may have standard dimensions. So can the case 6 For example, have a width of 45 cm or 60 cm, which is an integration of the dishwasher 1 in a standard designed kitchenette with a suitable Einbaunische allows. The housing 6 but may be omitted partially or completely.

On the back of the dishwasher 1 is a schematically illustrated water inlet device 7 arranged, which is intended to receive water from an external water supply.

In this case, the water supply device comprises 7 a controllable water inlet valve 8th and a water hose 9 , For example, the valve 8th be designed as a solenoid valve. The inlet side of the valve 8th is formed so that it can be attached to a fitting WH a household water supply, for example, to a faucet WH. The connection can be made in each case by means of a screw connection, a snap connection or the like. Such valves 8th are also under the name Aquastop valve 8th known. Advantageously, these are closed when they are not driven, so that the dishwasher 1 is disconnected from the water supply WH in the off state. In this way, in the event of a fault leakage of water leakage from the switched-off dishwasher 1 be avoided.

Intended is in 1 the inlet side of the water inlet valve 8th connected to a tap WH. The outlet side of the water inlet valve 8th is with the water hose 9 connected, in turn, with a connector 10 on the housing 6 the dishwasher 1 connected is. By means of the water inlet device 7 It is therefore possible to control water from an external water supply WH individually controlled inside the dishwasher 1 to lead.

In a lower area of the washing container 4 is a sump 11 provided, in which expediently a circulating pump for circulating water in the washing chamber 3 is provided during a wash cycle. In this case, the circulation pump can be a heating device for heating the in the rinsing chamber 3 located water, for example, a water heater, have. Likewise, in the sump 11 a pump for pumping out water, for example, be provided at the end of a wash cycle. However, the various pumping functions can also be perceived by a single pump in conjunction with switchable valves. The sump 11 is usually with a wastewater connection piece 12 connected by means not shown so that water from the rinsing chamber 3 via one to the wastewater connection piece 12 connected sewage hose 13 in a building side installed wastewater A, for example, a sewer pipe A, can be pumped.

In the dishwasher according to the invention 1 is the door 5 for closing the rinsing chamber 3 one by the controller 2 controllable opening device 14 assigned, which may be arranged, for example, fixed to the housing or door fixed. Furthermore, the dishwasher 1 a sorption drying device 15 on which on an outside of the washing container 4 and / or in the space between the inner wall and the outer wall of the door 5 if the case 6 partially or completely omitted, or on one side between the washing 4 and the possibly existing housing 6 can be arranged.

2 shows a functional diagram of the dishwasher of 1 , The water valve 8th is so with the controller 2 connected, that it is individually controllable. Downstream of the housing-fixed connector 10 is a feed 16 to the Loading the rinsing chamber 3 with water from the inlet device 7 arranged. This makes it possible for the washing container 2 via the inlet water valve 8th , the inlet hose 9 , the wall-mounted connector 10 and the inflow 16 depending on the selected rinse program to fill with water.

In the sump 11 the rinsing chamber 3 is designed as a heating pump circulating pump 17 arranged, which in conjunction with a inside the rinsing chamber 3 arranged spraying system 18 stands. This includes one or more sprayers 18 such as rotatable spray arms. This makes it possible in the rinsing chamber 3 To be arranged washware during a rinse with water to clean this. Furthermore, in the sump 11 a drain pump 19 arranged, which makes it possible to pump out no longer needed water to the outside. At the heating pump 17 is both the heating function and the pumping function by the controller 2 individually controllable. Furthermore, the flow control device is also with the drain pump 19 connected to their control.

The sorption drying device 15 has an air handling system 20 . 21 . 23 on which a blower 20 , a suction-side air line 21 and a pressure-side air line 23 includes. The fan 20 is via the suction-side air line 21 with an air outlet 22 the rinsing chamber 3 and via the pressure-side air line 23 with an air inlet 24 the rinsing chamber 3 connected.

During a drying step of a rinsing program, an air flow LS consisting of internal air IL can thus be generated, which flow through an air line in the pressure side 23 arranged sorption column 25 is guided. The sorption column 25 could also be in the suction-side air line 21 be arranged and contains a reversibly dehydratable material 26 which during the drying step moisture in the air flow LS, which from the rinsing chamber 3 comes, sorbed. As a result, the air flow LS is dried, which then, when it enters the washing chamber 3 is returned, can absorb more moisture, resulting in a drying of the indoor air IL in the washing chamber 3 leads.

To the sorption column 25 to desorb, is a preferred electric heater 27 provided, which has a heating element, which in the air duct system 20 . 21 . 23 is arranged to the sorption column 25 to heat. This is the reversibly dehydratable material 26 heated to very high temperatures, for example to 300 ° C. A part of this usually by means of the electric heater 27 generated heat is used to overcome the binding forces between the sorbed water molecules and the reversibly dehydratable material 26 used. The other part, however, in the form of waste heat with the air flow LS in the washing chamber 3 brought in. It is provided that in a desorption of the sorption column 25 to use the resulting waste heat to heat at least the water required for a program step for rinsing items to be washed.

In the embodiment, the door 5 one at a lower end of the door 5 horizontally extending axis 28 pivoted. The door 5 but could also be stored displaceable. The door is in the embodiment 5 on a front of the dishwasher 1 arranged. But it is also possible, the door 5 on a top of the dishwasher 1 provided.

The control of the water inlet device 7 , the heating pump 17 , the drain pump 19 , the sorption desiccator 15 , the opening device 14 as well as other devices of the dishwasher which are not explained here 1 occurs as a function of a selected wash program, which in the control device 2 is stored. It is in a dishwasher according to the invention 1 at least one rinsing program is provided, wherein during a drying step of the washing program for drying the dishes the door 5 for closing the rinsing chamber 3 is automatically opened so as to mix the humid indoor air IL of the washing chamber 3 with a normally drier outdoor air AL to improve so as to improve the drying result and during the drying step, a drying of the IL indoor air in the washing chamber 3 before opening the door 5 by means of a control device 2 controllable sorption drying device 15 is provided to prevent unwanted condensation.

Advantageously, it is provided that the opening of the door 5 so that takes place between the the rinsing chamber 3 limiting rinse tank 4 and the door 5 a gap ST is formed whose maximum width MB is at least 2 mm, preferably at least 4 mm, more preferably at least 6 mm, and / or at most 40 mm, preferably at most 30 mm, particularly preferably at most 20 mm. At the specified minimum values, an effective mixture of the internal air IL with the outside air AL can be ensured. At the specified maximum values can when opening the door 5 a risk to persons are excluded.

3 shows a functional diagram for explaining the function of the dishwasher according to the invention 1 of the 1 and 2 , For this purpose, the course of a washing program SP is shown.

In 3 are shown on a common time axis t the curves SZV, SLP, TST, BGE and BHZ, which switching or operating states of components of the dishwasher 1 show on the vertical axis Z

The curve SZV represents the switching state of the inlet water valve 8th the dishwasher 1 , The switching state "0" corresponds to a closed valve 8th , the switching state "1" an open valve 8th , Furthermore, the curve SLP shows the switching state of the wastewater pump 19 the dishwasher 1 , The switching state "0" corresponds to a disconnected sewage pump 19 , the switching state "1" of a switched on sewage pump 19 , The curve TST symbolizes the position of the door 5 wherein the state "0" means that the door is closed, and wherein the state "1" means that the door 5 is open. The curve BGE also sets the operating state of the blower 20 where the off state is symbolized by "0" and the on state by "1". The curve BHZ finally shows the operating state of the heater 27 , Again, the off state by "0" and the on state by "1".

In 3 an irrigation program SP is shown by way of example which comprises a pre-rinsing step VS, a cleaning step RS, an intermediate rinsing step ZS and a rinsing step KS for rinsing items to be washed using water in this order. This is followed by a drying step TS for drying the cleaned items to be washed. In other examples, one or more of these steps might be hidden. Also examples would be possible in which one or more steps are repeated several times. In addition, a desorption DS of the sorption 25 provided, which is timed to the already mentioned program steps.

The first pre-rinsing step VS serves to remove coarse dirt from dishes, thus preparing the cleaning step RS. For this purpose, at the beginning of the pre-rinse step VS the feed water valve 8th opened, allowing water from the water supply WH via the inlet 16 in the rinsing chamber 3 arrives. When the rinsing chamber 3 is charged with a sufficient amount of water from the water supply WH for the pre-rinsing step VS, the water valve 8th closed again. The water is in the rinsing chamber 3 by means of the heating pump 17 for a given time, usually without - in exceptional cases with connection - their heating device, circulated and over the one or more sprayers 18 in the rinsing chamber 3 sprayed so as to pressurize the dishes with water. Thereafter, the now polluted water by means of the drain pump 19 pumped out.

The subsequent cleaning step RS is used to thoroughly clean the dishes. At the same time, desorption DS of the sorption column is preferably carried out 25 carried out to water, resulting in a drying step of a previously performed rinse on the reversibly dehydratable material 26 attached to remove. For this purpose, on the one hand, the blower 20 and on the other hand, the heater 27 switched on. In this way, the air flow LS, the waste heat of desorption DS is created in the washing chamber 3 transported. The fan 20 and the heater 27 are usually turned off when the reversibly dehydratable material 26 essentially freed from sorbed water. This time can be reached before the completion of the cleaning step RS.

During the cleaning step RS, it is usually necessary to apply water to the wash ware, which has a comparatively high temperature in order to achieve a high thermal cleaning effect. In addition, water is generally added to the detergent whose chemical cleaning action is best at a higher temperature. Usually, therefore, a temperature of about 50 ° C to 70 ° C is provided for a cleaning step RS. Due to the air flow LS into the rinsing chamber 3 introduced waste heat, this temperature without switching the in the sump 11 arranged through-flow heater of the heating pump 17 be achieved easily, even if at the beginning of the cleaning step RS low-temperature water in the washing chamber 3 is introduced. For this purpose, the inlet water valve is at the beginning of the cleaning step RS 8th temporarily open. That in the rinsing chamber 3 filled water is now circulated by means of the heating pump for a predetermined time and over the one or more sprayers 18 in the rinsing chamber 3 sprayed. In this case, the water is increasingly heated by the waste heat of the desorption DS, so that the desired temperature for the purification step RS is achieved.

In this way, the cleaning step RS can be carried out particularly efficiently. So here can be achieved a high saving of electrical energy, since the water from the water supply WH usually not at all, in rare cases only to a small extent, by the electric heating pump 17 the dishwasher 1 must be reheated to reach the desired temperature.

At the conclusion of the cleaning step RS, the now polluted hot water by means of the drain pump 19 pumped out.

The now performed intermediate rinse step ZS for removing detergent from the items to be washed after the cleaning step RS provides a re-feeding of the rinsing chamber 3 with water from the water supply WH, in order to be able to supply the wash ware with clean water. For this purpose, first the feed water valve 8th open until the rinse chamber 3 is charged with a sufficient amount of water for the intermediate rinse step ZS. This water is by means of the heating pump 17 circulated for a predetermined time and over the one or more sprayers 18 in the rinsing chamber 3 sprayed, usually a connection of the heating of the circulation pump 17 can be omitted. Thereafter, the now polluted water by means of the drain pump 19 pumped out.

The rinse step KS which now follows serves, in particular, to prevent stains on the items to be washed, which could be caused by dissolved substances in the water, such as, for example, salt and / or lime. For this purpose, the water is added during the rinse step KS with rinse aid. With a dishwasher 1 with a sorption drying device 15 it is generally not necessary to heat the dishes during the rinse step KS to a higher temperature. Therefore, in the rinse step KS first the water valve 8th open until the rinse chamber 3 is charged with a sufficient amount of water for the rinse step KS. This water is by means of the heating pump 17 circulated for a predetermined time, which is usually a connection of the heating of the circulation pump 17 can be omitted. At the end of the rinse step KS the now polluted water by means of the drain pump 19 pumped out.

During the final drying step TS is a loading of the rinsing chamber 3 not provided with water. Rather, the now cleaned items to be washed by the blower 20 switched on and thus the air flow LS is generated. This takes in the washing container 4 Moisture, which is then in the reversibly dehydratable material 26 is deposited, whereby the inner air IL is dried. When the inside air IL is sufficiently dried, the door is opened at time t1 so as to achieve mixing of the inside air IL of the washing chamber with a normally drier outside air AL so as to improve the drying result.

By now the indoor air IL in the rinsing chamber 3 before opening the door 5 by means of the sorption drying device 15 dried, in particular pre-dried, the proportion of water molecules in the internal air IL in the washing chamber 3 be reduced so that the through the open door 5 exiting indoor air IL is so dry that condensate formation on neighboring objects is reduced or prevented. In particular, such a strong condensation on one above the dishwasher 1 arranged worktop or be avoided on an adjacent kitchen cabinet, so that both mold growth and swelling of the usually made of fiber material or wooden worktops and kitchen cabinets can be avoided.

Advantageously, it is provided that the drying of the inner air IL takes place in such a way that the relative humidity of the inner air IL is less than 100%, preferably less than 90%, particularly preferably less than 80%. The relative humidity is expressed as a percentage of the proportion of water vapor to the internal air IL relative to the maximum possible proportion of water vapor to the internal air IL. At the indicated values, condensate formation on adjacent objects can be effectively reduced or prevented. In order to comply with the values, a sensor for measuring the relative humidity could be provided with the control device 2 could be linked to the transmission of corresponding measured values. In many cases, however, it is sufficient if a device-type-dependent period of time ZD for drying the inside air IL is determined in laboratory tests, at which the values are reached. This type of device-dependent time ZD can then be stored in the wash program SP and used in the control of the wash cycle, whereby the observance of the values can be ensured even without a special sensor.

It is preferably provided that the wash program SP is designed such that the drying step TS is followed by an unheated water-conducting wash step VS, ZS, KS, in particular to a final rinse step KS. An unheated water-conducting rinsing step VS, ZS, KS is understood to mean a rinsing step in which the water used is not actively heated. In this way, the temperature of the indoor air IL when opening the door 5 be lowered, so that the inside air IL when exiting the rinsing chamber 3 Less cools, which in turn means that the relative humidity of the indoor air IL increases less as it exits. As a result, the condensation can be further reduced.

It is expediently provided that the door is opened at the earliest when a temperature of the inside air IL below 50 ° C., preferably below 40 ° C., is particularly preferred is below 30 ° C. By previous heated rinsing steps RS, but also by the use of Sorptionstrockenvorrichtung 15 for drying the inside air IL, the temperature of the inside air IL during the drying step TS is generally well above the outside air temperature AL, which is typically in the range of 15 ° C to 25 ° C. Therefore, it cools after opening the door 5 the exiting internal air IL usually off, which leads to an increase in the relative humidity. At the specified maximum temperatures for indoor air IL before opening the door 5 However, this effect can be kept low, so that condensation is counteracted. To comply with the values, a sensor could be provided for measuring the temperature of the internal air IL associated with the control device 2 could be linked to the transmission of corresponding measured values. In many cases, however, it is sufficient if laboratory-type-dependent parameters for the drying step are determined at which the intended values are reached. These device-type-dependent parameters can relate, for example, to the timing of the rinse cycle and / or the performance of the sorption drying device. They can then be stored in the rinsing program SP and used in the control of the rinse cycle, whereby the observance of the values can be ensured even without a special sensor.

Advantageously, it is provided that the sorption drying device 15 a by the controller 2 controllable fan 20 for generating an air stream LS consisting of internal air IL, passing through a sorption column 25 the sorption device 15 is guided, wherein the washing program SP is designed so that the blower 20 after opening the door 5 is switched on for a program-controlled time interval ZI. By the operation of the blower 20 after opening the door 5 a rapid mixing of the indoor air IL with outdoor air AL can be achieved. In this way, the drying efficiency can be improved because the drying effect of the outside air AL starts particularly quickly. In addition, it can be achieved that hardly any pure indoor air IL from the washing chamber 3 but essentially mixed with outside air AL inside air, which further counteracts the formation of condensate.

It is preferably provided that the program-controlled time interval ZI immediately, so without significant pause, to the opening of the door 5 followed. In this way, the mixing of the inside air IL with outside air AL can be done very quickly.

Appropriately, it is provided that the duration of the program-controlled time interval ZI is at least 15 s, preferably at least 30 s, more preferably at least 60 s, and / or at most 360 s, preferably at most 180 s, particularly preferably at most 90 s. At the specified minimum values, an effective acceleration of the mixture of the inside air IL with the outside air AL can be ensured. At the specified maximum values, the operation of the blower with the door open 5 resulting noise emission can be minimized.

Appropriately, it is provided that a sewage pump 19 is provided for pumping out water, wherein the washing program SP is designed so that the sewage pump 19 during the drying step TS at least temporarily and only before the door is opened 5 is turned on. By at least temporarily turning on the sewage pump 19 during the drying step TS can residual water from the washing chamber 3 be dissipated so that it does not evaporate. This allows the drying efficiency of the dishwasher 1 be further improved. In addition, so the formation of condensation can be further counteracted. By pumping the residual water by means of the sewage pump 19 Only before the door is opened, can the noise of the dishwasher 1 be minimized.

Before the automatic opening of the flush door 5 the dishes are passed through a sorption drying unit 15 (Zeolite) predried. After the automatic opening of the dishwasher door 5 can the zeolite fan 20 if necessary continue running, this air circulation supports the further drying process.

The humidity in the dishwasher 1 is through the Sorptionstrockenvorrichtung 15 , in particular a zeolite drying system, reduced to less than 100%, so that the hot air IL exiting after the automatic, ie forced, opening does not or only slightly condenses on the adjoining kitchen furniture. Since the drying temperature in the Sorptionstrockenvorrichtung is advantageously much smaller than that in the heat exchanger or self-heat drying, the air cools less on emergence, so that, therefore, less or no condensate. In particular, it is thus largely avoided that condensate is deposited on the underside of a kitchen worktop above the dishwasher and / or on kitchen furniture arranged laterally from the dishwasher. According to the invention, therefore, the drying cycle is made up of a first partial drying cycle by sorption drying and a time downstream of this, by means of an opening device such as 14 forcibly performed, program-controlled door opening step together, in which escape through a door opening gap inside air from the washing chamber in the environment of the dishwasher and against the inside air drier outdoor air can flow into the washing chamber. By this temporally downstream door opening step remaining after the Sorptionstrocknungsgang residual moisture on the items to be washed can be removed. Since the drying cycle is composed of a sorption drying cycle and a time-dependent door opening step, it may no longer be necessary for the sorption drying device to provide the entire drying performance alone, but it can be designed to be smaller than for a sorption drying device provided alone, so that less energy and less sorption drying material is needed. In everyday use, this combination of sorption drying and post-drying can be improved by forced door opener ensure that even cup trays or utensils with low heat storage capacity (eg plastic items) are perfectly dried, depending on how much time between the opening of the door and the clearing by the user lies.

LIST OF REFERENCE NUMBERS

1

 dishwasher

2

 control device

3

 rinsing chamber

4

 rinse tank

5

 door

6

 casing

7

 Water inlet device

8th

 Inlet water valve

9

 water hose

10

 fixed housing

11

 sump

12

 Sewage fitting

13

 drain hose

14

 opening device

15

 sorption

16

 inlet

17

 circulating pump

18

 spraying

19

 Lye pump, sewage pump

20

 fan

21

 suction-side air line

22

 air outlet

23

 pressure-side air line

24

 air intake

25

 sorption

26

 reversibly dehydratable material

27

 heater

28

 axis

WH

 Water supply, faucet

A

 sewage pipe

IL

 indoor air

AL

 outside air

LS

 airflow

ST

 gap

MB

 maximum width

SZV

 Switching state of the inlet water valve

SLP

 Switching state of the drain pump

TST

 door position

BGE

 Operating condition of the blower

BHZ

 Operating status of the heater

SP

 washing program

VS

 pre-wash

RS

 cleaning step

ZS

 intermediate rinsing

KS

 rinsing step

TS

 drying step

DS

 desorption

ZD

 time

ZI

 time interval

Z

 vertical axis

t

 Time

Claims (10)

Dishwasher, in particular domestic dishwasher ( 1 ), with a control device ( 2 ) for controlling a rinse cycle for cleaning items to be washed on the basis of at least one in the control device ( 2 ) stored washing program (SP), with a rinsing chamber ( 3 ) to receive the items to be washed during the wash cycle, with a door ( 5 ) for closing the rinsing chamber ( 3 ), which one by the control device ( 2 ) controllable opening device ( 14 ), wherein the control device ( 2 ) at least one rinsing program (SP) is executable, which comprises a drying step (TS) for drying the items to be washed, which means opening the door ( 5 ) by an actuation of the opening device ( 14 ) by the control device ( 2 ), characterized in that the wash program (SP) is designed such that during the drying step (TS) a drying of an internal air (IL) in the wash chamber ( 3 ) before opening the door ( 5 ) by means of a control device ( 2 ) controllable sorption drying device ( 15 ) is provided. Dishwasher according to the preceding claim, characterized in that the drying of the internal air (IL) takes place in such a way that the relative humidity of the inside air (IL) is less than 100%, preferably less than 90%, more preferably less than 80%. Dishwasher according to one of the preceding claims, characterized in that the washing program (SP) is formed so that the drying step (TS) to an unheated water-conducting rinsing step (VS, ZS, KS), in particular to a final rinse step (KS), connects. Dishwasher according to one of the preceding claims, characterized in that the opening of the door ( 5 ) at the earliest when an internal air temperature (IL) is below 50 ° C, preferably below 40 ° C, more preferably below 30 ° C. Dishwasher according to one of the preceding claims, characterized in that the sorption drying device ( 15 ) by the control device ( 2 ) controllable fan ( 20 ) for generating an internal air (IL) existing air stream (LS) by a sorption column ( 25 ) of the sorption device ( 15 ), wherein the washing program (SP) is designed so that the blower ( 20 ) after opening the door ( 5 ) is turned on for a program-controlled time interval (ZI). Dishwasher according to the preceding claim, characterized in that the program-controlled time interval (ZI) directly to the opening of the door ( 5 ). Dishwasher according to claim 5 or 6, characterized in that the duration of the program-controlled time interval (ZI) at least 15 s, preferably at least 30 s, more preferably at least 60 s, and / or at most 360 s, preferably at most 180 s, particularly preferably at most 90 s, is. Dishwasher according to one of the preceding claims, characterized in that the opening of the door ( 5 ) is done so that between a the rinsing chamber ( 3 ) limiting washing containers ( 4 ) and the door ( 5 ), a gap (ST) is formed whose maximum width (MB) is at least 2 mm, preferably at least 4 mm, particularly preferably at least 6 mm, and / or at most 40 mm, preferably at most 30 mm, particularly preferably at most 20 mm. Dishwasher according to one of the preceding claims, characterized in that a wastewater pump ( 19 ) is provided for pumping out water, wherein the washing program (SP) is designed so that the wastewater pump ( 19 ) during the drying step (TS) at least temporarily and exclusively before opening the door ( 5 ) is turned on. Method for operating a dishwasher ( 1 ), in particular according to one of the preceding claims, with a control device ( 2 ) for controlling a rinse cycle for cleaning items to be washed on the basis of at least one in the control device ( 2 ) stored washing program (SP), with a rinsing chamber ( 3 ) to receive the items to be washed during the wash cycle, with a door ( 5 ) for closing the rinsing chamber ( 3 ), which one by the control device ( 2 ) controllable opening device ( 14 ), wherein the control device ( 2 ) at least one rinsing program (SP) is carried out, which comprises a drying step (TS) for drying the dishes, in which the door ( 5 ) is opened by the opening device ( 14 ) by the control device ( 2 ) is actuated, characterized in that the rinsing program (SP) is designed such that during the drying step (TS) a drying of an internal air (IL) in the rinsing chamber ( 3 ) before opening the door ( 5 ) by means of a control device ( 2 ) controllable sorption drying device ( 15 ) is carried out.

Images