EP3076086A1 - Domestic cooking appliance and method for operating same - Google Patents

Abstract

The Haushaltsgargerät (21) has a cooking chamber (2), at least one metering device (K) for successively adding a plurality of treatment additives (B1, B2) to water to form a respective treatment agent, wherein the cooking chamber (2) is treatable by the plurality of treatment means in succession, and a receiving means for jointly receiving the treatment agents after the respective treatment of the cooking chamber, wherein the household cooking appliance (1) has a first tank (6) which can be filled with the water by the user, the metering device (K) is set up, the treatment additives (B1, B2) on the device side and the receiving means (12) is designed as a user emptied tank. The method (S1-S14) serves for operating a household cooking appliance (1; 21; 31), wherein water originating from a first, user-fillable first tank (6) is brought into a cooking chamber (2) (S4) and a first treatment additive ( B1) is added to the cooking chamber (2) to form a first treating agent with the water (S5). The invention is particularly advantageously applicable to furnaces, in particular with a Dampfgarfunktion.

Description

The invention relates to a Haushaltsgargerät, comprising a cooking chamber, at least one metering device for successively adding a plurality of treatment additives to water to form a respective treatment agent, wherein the cooking chamber is treated successively by the plurality of treatment means, and a receiving means for jointly receiving the treatment agent after treatment of the cooking chamber. The invention also relates to a method for operating, in particular cleaning, a Haushaltsgargeräts. The invention is particularly advantageously applicable to furnaces, in particular with a Dampfgarfunktion.

EP 2 273 200 A1 discloses a cooking appliance comprising a cooking chamber, a controller and at least one water connection for supplying water to the cooking appliance, a first water connection with a first controllable valve, via which alkaline water can be supplied to the cooking appliance, a second water connection with a second controllable valve, Acidic water can be supplied via the cooking appliance, the two controllable valves being in operative connection with the control of the cooking appliance; and a method for controlling such a cooking appliance. Among other things, a high design effort and a high connection costs are disadvantageous.

DE 10 2011 010 283 A1 discloses a method for cleaning a household appliance, in particular a steamer, with a cooking chamber. First, in a first program step, a metered addition of a cleaning solution into the cooking chamber and the start of a first cleaning cycle. This is followed by the evaporation and distribution of the cleaning solution in the cooking chamber. There is a solution and collection of pollution in the oven. In a further, second program step, a neutralization / descaling solution is metered into the cooking chamber and a second cleaning cycle is started. The evaporation and distribution of the condensation / descaling solution takes place in the cooking chamber. Coverings are dissolved and the used neutralization / descaling solution is collected in the cooking chamber. However, this method is either not very user-friendly or expensive to implement.

It is the object of the present invention to overcome the disadvantages of the prior art at least partially, and in particular an improved possibility for To provide versatile and user-friendly implementable cleaning of household cookware.

This object is achieved according to the features of the independent claims. Preferred embodiments are in particular the dependent claims.

The object is achieved by a Haushaltsgargerät, comprising a cooking chamber, at least one metering device for sequentially adding a plurality of treatment additives to water to form a respective treatment agent, wherein the cooking space is treated successively by the plurality of treatment means, and a receiving means for jointly receiving the treatment agent after treatment of the cooking chamber. Further, the Haushaltsgargerät on a user side fillable with the water first tank, the metering device is adapted to the treatment additives on the device side or device side controllably admit and the receiving means is designed as a user emptied tank.

This Haushaltsgargerät has the advantage that it is independent of external water connections by the presence of the first tank and therefore can be used for many types of cooking appliances, including those that have no Dampfgarfunktion. In addition, it can be dispensed with an expensive connection and connection installation for water. Nevertheless, the cleaning of Haushaltsgargeräts is easy to carry out, since a user only needs to have access to the tanks and, for example, during a cleaning process itself does not need to add cleaning liquid, as this happens on the device side. In addition, the spent treatment agents can now be removed very easily as a mixture of the cooking chamber. The treatment agents may in particular be coordinated with one another such that their mixture is less hazardous than the individual treatment agents.

A treatment additive or active ingredient may be a liquid or solid (eg powdered) concentrate, in particular a water-soluble concentrate. The treatment agent or active agent resulting from the addition is provided in particular for the treatment of the cooking chamber and optionally in the cooking chamber befindlicher components. At least one treatment agent may be a respective cleaning agent, for example for dissolving fatty residues of walls of the cooking chamber or for dissolving lime.

It is a further development that a treatment agent is a treatment fluid, that is, that it can be present as a liquid and / or as a vapor.

It is a further development that at least one cleaning agent is a cleaning fluid, in particular a cleaning fluid. This can be used in particular to clean the cooking chamber or its walls. The cleaning liquid can, for. B. be an alkaline liquid, for example, in order to remove in the cooking chamber or on the walls of which fat. The alkaline liquid may e.g. have a pH of 11 or more. The cleaning liquid may also be an acidic liquid, for example to remove lime etc. present in the cooking space or on its walls and / or to neutralize cleaning liquid previously used as cleaning liquid. The acidic liquid may e.g. have a pH of 2 or less. It is a development which is advantageous for a particularly safe treatment process and a particularly safe disposal that at least one treatment agent has a neutralizing effect in relation to a previously used treatment agent.

In one development, the cleaning agent can be distributed in a vaporous state in the cooking chamber and then deposit as liquid on surfaces (for example the cooking chamber walls).

The fact that the cooking space can be treated successively by the plurality of treatment agents comprises, in particular, that at least one treatment agent has been drained from the cooking space into the user-settable tank before another treatment agent is added or added.

The fact that the dosing device is set up to admit the treatment additives on the device side includes that a user does not need to add the treatment additives himself during a cleaning program, but that this is done or initiated by the device. In particular, it is thus possible to dispense with supply channels in the cooking chamber for the successive supply of the treatment additives to the user.

The metering device can be permanently installed in the cooking appliance. It may alternatively be user-side and / or user-removable and removable, e.g. can only be used for a cleaning process. In this case, in particular, a receptacle for the metering device is permanently present in the cooking appliance.

In principle, a tank can be understood to mean any suitable container for storing liquid (s). The tank can be open or closed on the top.

It is an embodiment that the user-side emptying tank is a second tank. As a result, it is possible to prevent the mixture of the treatment agents from entering the first tank or leaving residues of the mixture of the treatment agents in the first tank. This is particularly advantageous if the first tank for supplying water, especially clear water, is needed in the cooking chamber for food treatment, for example for a steam generating operation.

It is still an embodiment that the user-emptied tank is the first tank. This can save a second tank. This is particularly advantageous if the mixture of detergents is harmless.

It is a further embodiment that the water from the first tank via a fixed in the Haushaltsgargerät arranged, lockable against the cooking chamber latch in the oven can be brought. This provides the advantage that water can be drained from the first tank before a first treatment agent is discharged into the first tank. Thus, the cooking chamber can be treated in a particularly user-friendly manner with only one tank, namely the first tank, by means of several treatment means in succession. In particular, a circulating operation for liquid in the cooking chamber is thus easily implementable.

It is a further refinement that is advantageous for a simple implementation of this embodiment that a maximum (nominal) filling volume of the intermediate store is equal to or greater than a maximum (nominal) filling volume of the first tank. It is also advantageous for avoiding an overflow of the second tank when it reaches at least the (nominal) filling volume of the first tank.

It is yet another embodiment that at least the user-emptied tank outside the cooking chamber or on a side facing away from the cooking chamber Garraumwandung is arranged. So it is protected against contamination during a cooking operation, for example against vapors.

It is a development that a bottom of the cooking chamber with the user-side emptied tank is connectable. Thus, liquid can be almost completely removed from the oven. The connection (for example a fluid channel) may optionally be interrupted or opened by the device by means of a shut-off device (for example for leaving or discharging a treatment agent into the user-side emptied tank). The shut-off device may e.g. be a controllable valve or have.

It is also an embodiment that the Haushaltsgargerät has a liquid circuit in which liquid is circulated, wherein the cooking chamber has a part of the liquid circuit. Because of this, liquid can be discharged from the cooking chamber (for example, on the bottom side) and can be introduced again into the cooking space at another location, a particularly efficient treatment of the cooking chamber is possible when using a treatment agent in the form of liquid.

It is a development that the circulation circuit has no tank as a component, so no tank is a part of the circulation. Alternatively, at least one tank (e.g., the first tank and / or the user-settable tank) may be part of the recirculation loop.

It is advantageous for an even more efficient treatment of the cooking chamber further development that the Haushaltsgargerät has at least one Fluidverteileinrichtung for distributing to be introduced into the cooking fluid. Thus, a particularly large-area wetting of the cooking chamber or its walls is made possible with the fluid. It is a development of the fact that the fluid distribution device is set up to distribute liquid in the cooking chamber. Such a liquid distribution device may have, for example, a nozzle or an atomizer. It may, for example, be adapted to spray liquid under pressure onto the walls of the cooking chamber and / or to finely atomize the liquid into the cooking chamber. It is still a further development of the fact that the Fluidverteileinrichtung is adapted to introduce steam into the cooking chamber or in to distribute the cooking space. Such a fluid distribution device may, for example, have a steam generator arranged outside the cooking chamber. But it can also be located in the cooking chamber evaporator shell o. exhibit.

It is a development of the fact that the household cooking appliance has a pump for pumping liquid out of the first tank, for example also for circulating the liquid.

It is also an embodiment that the at least one metering device dispenses at least one treatment additive into the cooking chamber. As a result, a particularly simple structure can be achieved, in particular if all treatment additives can be dispensed into the cooking chamber.

Alternatively or additionally, at least one electrically controllable metering device can deliver at least one treatment agent into a container located outside the cooking chamber, for example into the first tank and / or, if present, into the intermediate storage.

At least one metering device may have a metering valve for the metered discharge of at least one treatment additive.

It is a particularly user-friendly and easily implementable development that the at least one metering device is at least one cartridge that can be inserted through the cooking chamber. The cartridge may in particular be a disposable or disposable cartridge. The cartridge can be, for example, a cleaning cartridge from Gaggenau. The cartridge may in particular have a plurality of chambers in which respective treatment additives are accommodated. The cartridge can, for example, by respective Absperrwände of wax or the like against the cooking space. be separated. The successive delivery of the treatment additives into the cooking space can be controlled, for example, by the appliance, in that the shut-off walls have a different melting temperature and the household cooking appliance is set to set a cooking space temperature corresponding to a time of the desired delivery of a treatment additive.

It is still an embodiment that the Haushaltsgargerät has a Dampfgarfunktion and in particular for carrying out the Dampfgarfunktion the first tank is provided to be user-fillable with water to be evaporated. This allows the first tank of the household cooking appliance to be used for several purposes.

The Dampfgarfunktion can be achieved in particular by heating at least a portion of the bottom of the cooking chamber, so that water located on this part of the bottom can evaporate. This part may for example be an evaporator shell. The Haushaltsgargerät may have to bottom side heating elements, in particular in the area of the evaporator shell. Also, the evaporator bowl may have a drain opening for draining liquid, e.g. in the user-emptied tank.

Generally, instead of an evaporator shell and a steam generator may be present, which is arranged outside the cooking chamber.

It is also an embodiment that the Haushaltsgargerät is an oven, as in an oven typically requires a particularly high cleaning and ovens usually have no water connection. In the present household cooking appliance, for example, a pyrolysis function can be dispensed with. In the case of a baking oven, the cooking chamber can also be referred to as a furnace room. The oven can have a steam cooking function. However, the household cooker can be used e.g. also be a microwave oven or a pure steamer.

It is further an embodiment that the Haushaltsgargerät has at least one sensor for detecting at least one property of a content of at least the user-side emptied tank. As a result, a liquid present in the respective tank can be adjusted to a predetermined desired value or desired range and / or at least one action can be triggered upon reaching a predetermined value or value range, e.g. an optical and / or audible warning signal is triggered or switched off, a tank is unlocked, etc.

It is a development that at least one sensor is a pH sensor. As a result, it is possible to check a pH of a liquid in the tank which can be emptied by the user. For example, it can be checked as to whether a content of the user-side emptied tank is sufficiently neutral in order to be safely removed or discharged.

It is also a development that at least one sensor is a temperature sensor. Thereby, a temperature of a liquid in the user-side emptied tank can be checked. For example, it can be checked as to whether a content of the user-side emptied tank is sufficiently cold to be safely removed or drained.

It is also a development that at least one sensor is a level sensor. As a result, a fill level of a liquid in the user-side emptied tank can be checked. For example, it can be checked as to whether the user-emptied tank threatens to overflow.

It is also an embodiment that at least one tank from the Haushaltsgargerät can be removed. For example, the first tank and / or - if present - the second tank can be removed. The removability facilitates a user's filling (e.g., the first tank of clear water) and / or draining (e.g., the user-side dumpable tank). Alternatively or additionally, at least one tank can be filled or emptied via a filling and / or a discharge line.

It is also an embodiment that at least the user emptied tank can be removed and locked by the Haushaltsgargerät either against removal and unlocked for removal. For this purpose, the household cooker may e.g. have a corresponding locking device which is connected, for example, with a control device of the cooking appliance and can be controlled via this. Thus, e.g. It can be prevented that the user-emptied tank can not be removed during a treatment by means of a treatment agent, when the liquid is too hot, when the liquid is not sufficiently neutral, etc. The control device can be connected to a corresponding sensor.

If present, for example, the pump and the shut-off device may be connected to the control device of the Haushaltsgargeräts and controlled by this control device. This further supports automatic operation of the household cooking appliance.

The object is also achieved by a method for operating a Haushaltsgargeräts as described above, in which in a treatment process, in particular cleaning process, by means of Haushaltsgargeräts (a) from a first, user-fillable first tank water is discharged into a cooking chamber, (b) a first treatment additive is added to the cooking chamber to form a first treating agent with the water, (c) the first treating agent acts on the cooking chamber for a first time period, (d) the first treating agent is drained into a user-side emptiable tank (e ) is again brought out of the first tank water in the cooking chamber, (f) a second treatment additive is spent in the cooking chamber to form a second detergent with the water, (g) the second treatment agent acts on the cooking chamber for a second period of time and (h) draining the second treatment agent into the user-settable tank.

The method can be designed analogously to the Haushaltsgargerät and has the same advantages.

In particular, the process is automatic - except for filling the first tank with water and emptying a tank - automatically.

Further, the first treatment agent may be e.g. be an alkaline fluid.

Also, it is an embodiment that the second treatment agent is a fluid neutralizing the first treatment agent, e.g. an acidic fluid.

It is for a particularly effective cleaning advantageous embodiment that the first treatment agent and / or the second treatment agent can be heated by means of at least one heating element of Haushaltsgargeräts or are heated. In particular, the first treatment agent and / or the second treatment agent can thus be at least partially vaporized. The at least one heating element may for example be associated with an evaporator dish located in the cooking chamber. The at least one heating element can also be assigned to a steam generator arranged outside the cooking chamber. However, the heating can also be carried out without evaporation, for example by heating the cooking chamber to a desired oven temperature.

Especially in combination with it, but also alone, it is advantageous for a thorough treatment of the cooking chamber when the treatment agents are circulated, especially when they are sprayed into the cooking chamber. Advantageously, so also areas of the cooking chamber away from the floor can be more easily wetted with treatment agent. The spraying, in particular via a nozzle, additionally allows a mechanical action on soiling and also an improved cleaning effect.

In particular, step (c) and / or step (g) may comprise heating and / or circulating the respective treatment agents.

Also, before step (a) or between steps (d) and (e), the first tank may be filled with clear water on the user side.

Step (e) may involve directly transferring water from the first tank into the cooking chamber or indirectly transferring water from the first tank into the cooking chamber (e.g., via a buffer).

It is also an embodiment that at least the user emptied tank is selectively locked and unlocked depending on a detected by at least one sensor reading. The lock may generally be controlled without a sensor, e.g. by a time of commencement and end of a cleaning program.

Furthermore, it is a development that the treatment processes followed by a rinsing process, in which the cooking chamber is treated with clear water to remove even small residues of treatment agent. The clear water can also be heated (especially vaporized) and / or circulated. The water can also be started after the rinsing process in the user-side emptied tank.

Fig.1

zeigt als Schnittdarstellung in Seitenansicht ein Haushaltsgargerät gemäß einem ersten Ausführungsbeispiel;

Fig.2

zeigt einen möglichen Reinigungsablauf des Haushaltsgargeräts gemäß dem ersten Ausführungsbeispiel;

Fig.3

zeigt als Schnittdarstellung in Seitenansicht ein Haushaltsgargerät gemäß einem zweiten Ausführungsbeispiel;

Fig.4

zeigt als Schnittdarstellung in Seitenansicht ein Haushaltsgargerät gemäß einem dritten Ausführungsbeispiel; und

Fig.5

zeigt als Schnittdarstellung in Seitenansicht ein Haushaltsgargerät gemäß einem vierten Ausführungsbeispiel.

The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following schematic description of an embodiment which will be described in detail in conjunction with the drawings.

Fig.1

shows a sectional side view of a Haushaltsgargerät according to a first embodiment;

Fig.2

shows a possible cleaning process of Haushaltsgargeräts according to the first embodiment;

Figure 3

shows a sectional side view of a Haushaltsgargerät according to a second embodiment;

Figure 4

shows a sectional side view of a Haushaltsgargerät according to a third embodiment; and

Figure 5

shows a sectional side view of a Haushaltsgargerät according to a fourth embodiment.

Fig.1 shows a sectional side view of a household cooking appliance in the form of a steam oven 1. The steam oven 1 has a cooking chamber 2, the wall of which can also be referred to as a muffle. The cooking chamber 2 can be heated by means of electrically operated heaters 3 and 4, which can be activated and / or deactivated by means of a control device 5. The heater 3 here corresponds to a lower heat radiator, the heater 4 a top heat radiator. A convection heating may also be present, but is not shown.

In a ceiling of the cooking chamber 2 is a metering device in the form of a cleaning cartridge K can be used, which has two chambers C1 and C2. In an unconsumed state, the first chamber C1 is filled with an alkaline cleaning additive B1, while the second chamber C2 is filled with an acidic treatment additive B2. Dosing openings (not shown) of the chambers C1 and C2 are separated from the cooking chamber 2 by means of respective closure elements, which can melt depending on the temperature, since they are e.g. consist of wax. The closure elements are thus exposed to the cooking chamber 2. In this case, a melting temperature of the closure element of the first chamber C1 is lower than a melting temperature of the closure element of the second chamber C2. When the metering openings are open, the additives B1 or B2 are discharged directly into the cooking chamber 2.

The steam oven 1 further has a user removable and fillable first tank 6. In the first tank 6, liquid can be sucked out of the first tank 6 by means of a pump 7, to a nozzle 8 mounted in the cooking chamber 2 on the cover side. By means of the nozzle 8, the liquid can be distributed in the cooking chamber 2.

Liquid collecting at a bottom 9 of the cooking chamber 2 flows into a bowl ("evaporator bowl 10"). The evaporator shell 10 can be heated so much by means of the lower heat radiator 3 that liquid contained therein can evaporate. It is thus possible to carry out a steaming operation by filling clear water in the first tank 6 and without cleaning cartridge K.

The cartridge K can in particular be arranged so that the additives B1 or B2 fall directly into the evaporator shell 10 with open metering openings.

The steam oven 1 further comprises a second tank 12, which is arranged outside the cooking chamber 2 (here: below it) and user side can be removed and emptied. The second tank 12 is connectable via a shut-off valve 13 to the evaporator shell 10, so that at a corresponding opening of the shut-off valve 13 liquid from the evaporator shell 10 in the second tank 12 can be drained. Thus, in an open position of the shut-off valve 13 located in the evaporator bowl 10 liquid flowing from the cooking chamber 2 in the second tank 12, while in a closed position of the check valve 13, the liquid is held in the cooking chamber 2.

At least one sensor 14, which is connected to the control device 5, is assigned to the second tank 12, so that the control device 5 can also control the steam baking oven 1 on the basis of measured values generated by the at least one sensor 14. The at least one sensor 14 may e.g. a pH sensor, a temperature sensor and / or a level sensor.

For example, the control device 5 can actuate a locking device (not shown) for the first tank 6 and / or for the second tank 12 on the basis of the measured values. The first tank 6 and the second tank 12 are thus by means of the control device 5 selectively locked against removal and unlocked for removal.

Fig.2 shows a sequence of a possible cleaning method (S1 to S14) for cleaning the cooking chamber. 2

In a first step S1, an unused cleaning cartridge K is inserted into the ceiling of the cooking chamber 2 by a user, eg screwed, inserted, latched or clamped there.

In addition, in a second step S2, the user removes the first tank 6 from the steam oven 1, fills it with clear water and puts it back into the steam oven 1.

In a third step S3, the user - with the cooking chamber 2 closed - activates a cleaning process, e.g. a cleaning program, the steam oven 1.

As a result, in a step S4, on the device side, by means of control by the control device 5, part of the water in the first tank 6 is pumped by means of the pump 7 into the cooking chamber 2, where it collects in the evaporator shell 10.

Also, following the step S3, in a step S5, the cooking chamber 2 is heated by using the lower heat radiator 3, so that the water contained in the evaporator shell 10 is made to evaporate. On the walls of the cooking chamber 2 precipitating water flows back into the evaporator shell 10. The evaporator shell 10 is thus advantageously always filled with water.

If a cooking chamber temperature of the cooking chamber 2 reaches or exceeds the melting point of the closure element of the first chamber C1, this closure element melts, so that the associated metering opening is released to the first chamber C1 and the first cleaning additive B1 falls into the evaporator pan 10. There, the first cleaning additive B1 mixes with the water to form the first, liquid cleaning agent. The first cleaning agent is e.g. an alkaline liquid, in particular solution, which is particularly suitable for dissolving fat, etc. The steam oven 1 can therefore control the time of addition of the first cleaning additive B1 by suitably setting the cooking chamber temperature. The steam oven 1 now holds the oven temperature initially at a level which is below the melting temperature of the closure element of the second chamber C2.

In a following step S6, the first cleaning agent is left in the cooking chamber 2 for a predetermined (first cleaning) period of time. Due to the - optionally - continued evaporation of the first cleaning agent this is distributed over a large area on the walls of the cooking chamber 2.

After the end of the first cleaning period, in a step S7-optionally-at least the bottom heat radiator 3 is switched off and the first cleaning agent is discharged into the second tank 12 by opening the shut-off valve 13.

In a following step S8 - with now closed shut-off valve 13 - device side by means of the control device 5, a further part of the water in the first tank 6 is pumped by means of the pump 7 in the cooking chamber 2, where it collects again in the evaporator shell 10. In this case, at least the lower heating element 3 is also turned on again for evaporation of the water present in the evaporator shell 10 (if it had not already been switched on).

The control device 5 now sets the cooking chamber temperature to a value which is above the melting point of the closure element of the second chamber C2. As a result, in a following step S9, the metering opening is released to the second chamber C2, so that now the second cleaning additive B2 falls into the evaporator shell 10. There it mixes with water to form a second detergent. The second cleaning agent is here e.g. an acidic liquid, in particular solution, which can be used in particular for decalcifying the cooking chamber 2. The steam oven 1 can therefore control the time of addition of the second cleaning additive B2 by suitably setting the oven temperature.

In a following step S10, the second cleaning agent is left in the cooking chamber 2 for a predetermined (second treatment) period of time. Due to the - optionally - continued evaporation of the second cleaning agent this is distributed over a large area on the walls of the cooking chamber 2.

After the end of the first cleaning period, in a step S11 - optionally - at least the lower heat radiator 3 is switched off and the shut-off valve 13 is opened. As a result, the second cleaning agent is discharged into the second tank 12.

In the second tank 12, the two cleaning agents mix, neutralizing them to such an extent that they pose no danger to a user. The amount of additives B1 and B2 are such that the neutralization results.

Optionally, in a step S12, a rinsing process can now be initiated by the steam oven 1, in which, in turn, water from the first tank 6 is brought into the cooking chamber 2 and is then added there without additives, e.g. is evaporated. As a result, residues of detergent can be removed. The water can be drained towards the end of the flushing process in the second tank 12.

Following can - if necessary, after unlocking of the second tank 12, if via the sensor 14 and the control device 5 a safe removal option has been determined - taken in a step S13, the second tank 12 by a user and emptied.

In a following step S14, the now spent cleaning cartridge K can be removed and disposed of by a user.

Figure 3 shows a sectional side view of a Haushaltsgargerät in the form of a steam oven 15. The steam oven 15 differs from the steam oven 15 in that it allows the possibility of a circulation of a treatment agent, which allows a much more effective treatment of the cooking chamber.

For this example, instead of the check valve 13 or in addition to the shut-off valve 13 (not shown), a 3/2-way valve 16 is present. In a first switching position, the first 3/2-way valve 16 opens a connection between the evaporator shell 10 and - via a connecting line 18 - a second 3/2-way valve 17 and blocks the connection between the evaporator shell 10 and the second tank 12th As a result, liquid can flow from the evaporator shell 10 to the second 3/2-way valve 17. In a second switching position, the first 3/2-way valve 16 blocks the connection between the evaporator shell 10 and the second 3/2-way valve 17 and opens the connection between the evaporator shell 10 and the second tank 12. This allows liquid from the evaporator shell 10 flow into the second tank 12.

While the first 3/2-way valve 16 is in its first switching position, the second 3/2-way valve 17 is in its first switching position, in which there is a connection between the first 3/2-way valve 16 and the nozzle 8 opens and blocks a connection between the first 3/2-way valve 16 and the first tank. Then, by an operation of the pump 7, a circulation of a located in the cooking chamber 2 Treating agent on the evaporator shell 10 out of the cooking chamber 2 out and pressurized via the nozzle take place again in the cooking chamber 2, which significantly improves a treatment effect, in particular cleaning effect.

By contrast, if the second 3/2-way valve 17 is in its second switching position, the pump 7 can pump water from the first tank 6 into the cooking chamber 2, in this case also via the nozzle 8. If there is no shut-off valve 13, can the first 3/2-way valve 16 advantageously occupy a shut-off relative to the cooking chamber 2, in which no liquid is forwarded.

Figure 4 shows a sectional side view of a Haushaltsgargerät in the form of a steam oven 21. The steam oven 21 is similar to the steam oven 1 constructed, differs from this, however, by the presence of a permanently installed in the steam oven 21 intermediate memory 22nd

In addition, now a first 3/2-way valve 23 instead of the shut-off valve 13 is present. In a first switching position, the first 3/2-way valve 23 opens a connection between the evaporator shell 10 and the first tank 6 and blocks the connection between the evaporator shell 10 and the second tank 12. Thus, liquid from the evaporator shell 10 in the first Drain tank 6. In a second switching position, the first 3/2-way valve 23 closes the connection between the evaporator shell 10 and the first tank 6 and opens the connection between the evaporator shell 10 and the second tank 12. Thus, liquid from the evaporator shell 10 in the second Drain tank 12.

Also, now between the pump 7 and the cooking chamber 2 and between the pump 7 and the latch 22, a second 3/2-way valve 24 is present. In a first switching position, the second 3/2-way valve 24 opens a connection between the first tank 6 and the cooking chamber 2 and blocks the connection to the buffer 22. As a result, liquid can be pumped from the first tank 6 into the cooking chamber 2. In a second switching position, the second 3/2-way valve 24 blocks the connection between the first tank 6 and the cooking chamber 2 and opens the connection between the first tank 6 and the buffer 22. This allows liquid from the first tank 6 in the Cache 22 are pumped. The filling volume of the buffer 22 is in particular at least as large as the filling volume of the first tank 6, but in principle need not be.

In addition, a sequence of the intermediate storage 22 is connected via a shut-off valve 25 to the cooking chamber 2, in particular to the nozzle 8.

This embodiment provides the advantage that now liquid from the cooking chamber 2 is recirculated, as will be shown in more detail below.

Namely, before step S6, all the clear water from the first tank 6 is pumped into the buffer 22, for which purpose the second 3/2-way valve 24 is in the second switching position. By opening the shut-off valve 25, water from the buffer 22 can be discharged in portions into the cooking chamber 2, e.g. for steps S4, S8 and - if performed - S12.

For example, in steps S6 and / or S10 and / or during rinsing, liquid in the cooking chamber 2 can now be circulated by actuating the pump 7. If the 3/2-way valves 23 and 24 are in their first switching positions, liquid present in the evaporator bowl 10 can flow into the first tank 6 and be pumped directly back into the cooking chamber 2 by the pump 7. The steam oven 21 then provides a liquid circuit, the cooking chamber 2, the first tank 6 and the pump 7 being parts thereof. An improved distribution of the liquid in the cooking chamber 2 is achieved during the circulation by the provision of the nozzle 8, through which the liquid is distributed over a large area in the cooking chamber 2. In addition, by circulating a larger amount of detergent can be used as in the evaporator shell 10 fits.

For discharging liquid in the second tank 12, the 3/2-way valve 23 can be switched to the second switching position. For complete discharge of liquid in the second tank 12, the pump 7 after switching the 3/2-way valve 23 to run in the second switching position for a while.

The circulation circuit can also pass the first tank 6, for example analogously to Figure 3 , The circulation circuit can also have a separate pump.

Figure 5 shows a sectional side view of a household cooking appliance in the form of a steam oven 31st

The steam oven 31 is constructed similar to the steam oven 21, but differs from the steam oven 1 by the absence of the second tank 12. Thus, the first tank 6 is now also provided as the user-emptied tank. Instead of the 3/2-way valve 23, a simple shut-off valve 32 is provided, which is open for circulating the liquid and for discharging the liquid in the first tank 6.

Of course, the present invention is not limited to the embodiment shown.

Thus, it is possible to dispense with the nozzle 8 and to direct liquid into the evaporator dish in a targeted manner.

Also, the cooking chamber 2 can generally be treated successively by more than two treatment agents.

Also, no cartridge needs to be used, but it may be e.g. also a permanently installed metering device can be used.

Furthermore, the process steps need not be performed in the order given. Thus, e.g. Steps S1 and S2 are also executed in reverse order.

In addition, in a steam treatment device as the cooking appliance, the evaporator bowl may be missing in the cooking chamber and instead a steam generator may be present, in particular outside the cooking chamber. The steam generator, for example, have the buffer as a liquid storage and evaporate located in the buffer liquid for introduction into the cooking chamber.

Instead of just one pump, several pumps may be present, for example, a pump for pumping out the water from the first tank and a pump for circulating. This can be advantageous since these two functions can have different technical requirements.

In addition, instead of the evaporator shell arranged outside the cooking chamber steam generator may be present. This can e.g. be arranged between a pressure side of the pump and the cooking chamber or between the buffer and the cooking chamber. Also, the cache may be part of the steam generator.

Generally, "on", "an", etc. may be taken to mean a singular or a plurality, in particular in the sense of "at least one" or "one or more" etc., unless this is explicitly excluded, e.g. by the expression "exactly one", etc.

Also, a number may include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

LIST OF REFERENCE NUMBERS

1

steam oven

2

oven

3

heater

4

heater

5

control device

6

First tank

7

pump

8th

jet

9

ground

10

evaporator dish

12

Second tank

13

shut-off valve

14

sensor

15

steam oven

16

First 3/2-way valve

17

Second 3/2-way valve

18

connecting line

21

steam oven

22

cache

23

First 3/2-way valve

24

Second 3/2-way valve

25

shut-off valve

31

steam oven

32

shut-off valve

K

cleaning cartridge

C1

first chamber

C2

second chamber

B1

alkaline cleaning additive

B2

acid cleaning additive

S1

Inserting the cartridge

S2

Fill the first tank with clear water

S3

Activation of the cleaning process

S4

automatic filling of the evaporator shell

S5

Formation of the first cleaning agent

S6

Action of the first cleaning agent

S7

Draining the first cleaning agent

S8

automatic filling of the evaporator shell

S9

Formation of the second cleaning agent

S10

Acting of the second detergent

S11

Draining the second cleaning agent

S12

Flushing the cooking chamber

S13

Unlocking / removing / emptying the second tank

S14

Removal of used cartridge

Claims (15)

Household cooking appliance (1; 15; 21; 31), comprising a cooking space (2), at least one metering device (K) for successively adding a plurality of treatment additives (B1, B2) to water to form a respective treatment agent, - Wherein the cooking chamber (2) is treatable by the plurality of treatment means successively, and a receiving means for jointly receiving the treatment agents after the respective treatment of the cooking chamber (2), characterized in that the household cooking appliance (1) has a first tank (6) which can be filled by the user with the water, - The metering device (K) is adapted to the treatment additives (B1, B2) on the device side to admit and - The receiving means as a user-side emptied tank (12; 6) is formed. Haushaltsgargerät (1; 15; 21) according to claim 1, characterized in that the user-side emptied tank is a second tank (12). Haushaltsgargerät (31) according to claim 1, characterized in that the user-side emptied tank is the first tank (6). Haushaltsgargerät (21; 31) according to claim 3, characterized in that the water from the first tank (6) via a fixed in the Haushaltsgargerät (21; 31) arranged against the cooking chamber (2) lockable (25) latch (22) in the cooking chamber (2) can be brought. Household cooking appliance (1; 15; 21; 31) according to one of the preceding claims, characterized in that at least the tank (12; 6) which can be emptied by the user is arranged outside the cooking chamber (2). Household cooking appliance (15; 21; 31) according to one of the preceding claims, characterized in that the Haushaltsgargerät (21; 31) has a liquid circuit in which liquid is circulated, wherein the cooking chamber (2) has a part of the liquid circuit. Household cooking appliance (1; 15; 21; 31) according to one of the preceding claims, characterized in that the at least one metering device (K) delivers the treatment additives (B1, B2) into the cooking chamber (2). Household cooking appliance (1; 15; 21; 31) according to one of the preceding claims, characterized in that the at least one metering device (K) has at least one cartridge whose metering opening is exposed to the cooking chamber (2). Haushaltsgargerät (1; 15; 21; 31) according to one of the preceding claims, characterized in that the Haushaltsgargerät has a Dampfgarfunktion and for performing the Dampfgarfunktion the first tank (6) is provided to be user-fillable with water to be evaporated. Household cooking appliance (1; 15; 21; 31) according to one of the preceding claims, characterized in that the household cooking appliance (1; 21; 31) comprises at least one sensor (14) for detecting at least one property of a content of at least one tank (12; 6) having. Household cooking appliance (1; 15; 21; 31) according to one of the preceding claims, characterized in that at least one tank (6; 12) can be removed. Household cooking appliance (1; 15; 21; 31) according to one of the preceding claims, characterized in that at least the tank (12) which can be emptied by the user can be removed and locked by the household cooking appliance (1) optionally against removal and can be unlocked for removal. Method (S1-S14) for operating a household cooking appliance (1; 15; 21; 31), in which, in a cleaning process, by means of the household cooking appliance (1; 15; 21; 31) - Water coming from a first, user-side fillable first tank (6) in a cooking chamber (2) is spent (S4), a first treatment additive (B1) is added to the cooking chamber (2) in order to form a first treatment agent with the water (S5), the first treatment agent acts on the cooking chamber (2) for a first period of time (S6), - The first treatment agent is discharged into a user-side emptied tank (12, 6) (S7), is again brought from the first tank (6) originating water in the cooking chamber (2) (S8), a second treatment additive (B2) is introduced into the cooking chamber (2) in order to form a second treatment agent with the water (S9), - The second treatment agent for a second period of time on the cooking chamber (2) acts (S10) and - The second treatment agent is discharged into the user side emptied tank (12; 6) (S11). The method (S1-S14) according to claim 13, wherein the second treating agent has a neutralizing effect on the first treating agent. Method (S1-S14) according to one of claims 13 or 14, in which the treatment means are heated by means of at least one heating element (3) of the household cooking appliance (1).

Images