DE102019202389A1 - Cooking device with steam treatment function - Google Patents

Abstract

A cooking appliance (1) with steam treatment functionality has a cooking space (2) which can be heated by means of at least one cooking space heating element (3, 4), and an evaporator (9) in which the water (W) is located by means of at least one evaporating heating element ( 10) is heatable, with at least one oven heating element (3, 4) and at least one evaporator heating element (10) being connected electrically in parallel to each other and electrically in series with a mechanically switching temperature switch (12). A method is used to operate a cooking appliance (1) in the form of an oven with steam treatment functionality, in which, in the case of a combined oven / steam treatment operation, at least one oven heating element heating a cooking space (2) and at least one evaporating heating element (10) of an evaporator together by means of a mechanically switching temperature switch that senses a cooking space temperature, and when a temperature limiter (11) assigned to the at least one evaporator heating element (10) is triggered, the at least one evaporator heating element (10) is de-energized. The invention is particularly advantageously applicable to ovens with an added steam operating mode.

Description

The invention relates to a cooking device with a steam treatment functionality, having a cooking space that can be heated by means of at least one cooking space heating element, and an evaporator in which water can be heated by means of at least one evaporating heating element, with at least one cooking space heating element being electrically connected in series a mechanically switching temperature switch is switched. The invention is particularly advantageously applicable to baking ovens which are set up to carry out cooking processes with additional steam (“added steam operating mode”).

EP 0 277 337 A2 discloses an oven of a range, in which a pot-like evaporation vessel is inserted in the bottom of the oven muffle, which is connected to a water supply line. In order to avoid condensation in the cooking space, the cooking space wall is heated up before the formation and introduction of water vapor, and when operating with both circulated hot air and water vapor, the heating elements for both types of heating are switched on in cycles and alternately.

EP 2 789 923 A1 discloses an oven with an oven space with a closable opening for receiving food to be cooked or baked, an evaporator tray in a bottom wall of the oven compartment, an evaporation heating element being arranged to heat the evaporator tray. The evaporation dish is designed as an embossing in the bottom wall of the furnace space and the heating power of the evaporation heating element is designed to evaporate a volume of water that corresponds to the volume of such an embossing.

It is the object of the present invention to at least partially overcome the disadvantages of the prior art and, in particular, to provide a safe and inexpensive way of introducing steam into a cooking chamber in an energy-efficient way that is tailored to a quantity of food.

This object is achieved according to the features of the independent claims. Advantageous embodiments are the subject matter of the dependent claims, the description and the drawings.

• - einen Garraum, der mittels mindestens eines Heizkörpers (im Folgenden ohne Beschränkung der Allgemeinheit als „Garraum-Heizkörper“ bezeichnet) heizbar ist, und
• - einen Verdampfer, in dem befindliches Wasser mittels mindestens eines weiteren Heizkörpers (im Folgenden ohne Beschränkung der Allgemeinheit als „Verdampfer-Heizkörper“ bezeichnet) heizbar ist,

wobei

• - mindestens ein Garraum-Heizkörper und mindestens ein Verdampfer-Heizkörper elektrisch parallel zueinander geschaltet sind und elektrisch in Reihe zu einem mechanisch schaltenden Temperaturschalter geschaltet sind.

The object is achieved by having a cooking appliance with steam treatment functionality

• - a cooking space that can be heated by means of at least one heating element (hereinafter referred to as “cooking space heating element” without loss of generality), and
• - an evaporator in which the water located can be heated by means of at least one further heating element (hereinafter referred to as "evaporator heating element" without loss of generality),

in which

• - At least one oven heating element and at least one evaporator heating element are connected electrically in parallel to one another and are connected electrically in series with a mechanically switching temperature switch.

This cooking appliance has the advantage that a control, in particular timing, of the evaporator heating element can be implemented without an independent or dedicated circuit board or electronics. In particular, energy-efficient steam generation based on a quantity of food can also be implemented in simple and inexpensive ovens that use the mechanically switching temperature switch (and not, for example, control electronics) to control the cooking space heating elements. Existing components of a simple oven can be used, so that additional constructional expenditure is kept to a minimum.

A cooking process or cooking sequence with additional steam (also referred to as "added steam") is typically divided into a heating phase and a subsequent control phase in this cooking appliance.

Before or at the start of the cooking process, the user specified a steam mode and a target cooking space temperature. The choice of the operating mode includes e.g. a definition of the at least one cooking space heating element that can be used or activated during the cooking process. Furthermore, the at least one evaporator heating element is switched on or switched to be activated.

If an actual cooking space temperature in the cooking space is below the set cooking space temperature, the mechanically switching temperature switch for the at least one selected cooking space heating element is switched to be electrically conductive, otherwise it is switched to be electrically blocking. In other words, a switching point of the mechanically switching temperature switch corresponds to the set cooking space temperature. The mechanically switching temperature switch is therefore a temperature switch that switches at a predetermined (“setpoint”) cooking space temperature.

During the heating phase, the cooking space temperature is typically below the target cooking space temperature, for example room temperature. Therefore, the radiators that can be activated for the specified operating mode (ie the at least one selected oven heating elements and the at least one evaporator heating element) continuously controlled until the target oven temperature is reached. The cooking space is heated up and steam is generated by the evaporator, by means of which the cooking space is acted upon. Since the at least one evaporator heating element is continuously energized in the heating phase, a large amount of steam is then also generated. This is advantageous because many items to be cooked require a large amount of moisture at the beginning of a cooking process so that their surface remains elastic, for example, and does not dry out. For example, yeast dough promotes an increase in volume. Since both the cooking space and the food are at a low temperature during the heating-up phase, the resulting steam can be deposited on the food. This so-called condensation layer promotes the Maillard reaction on a bread dough, for example, which promotes browning and a glossy effect.

If the set cooking space temperature is reached, the heating-up phase changes to the control phase. In the control phase, the mechanically switching temperature switch operates the oven heating element in a clocked manner in order to maintain the set target oven temperature. Correspondingly, the at least one evaporator heating element is also switched clocked and thus maintains a supply of steam. The ratio of the output of the evaporator heating element to the output of the at least one activated cooking space heating element determines the amount of steam that is generated during the steam phase. In the control phase, food often only needs to be baked to completion and therefore only requires a smaller amount of steam.

The energy-efficient steam generation is achieved due to the design of the cooking appliance in that a larger amount of food to be heated requires more heat energy for cooking. As a result, by regulating or clocking the temperature switch, the operating time of the cooking space heating element is lengthened in comparison to smaller quantities of food in order to achieve and / or maintain the set target cooking space temperature. Correspondingly, more steam (more moisture) is generated in proportion to the amount of food to be cooked, which improves the baking result. Conversely, if the oven is less loaded, less steam is automatically generated and thus energy is saved. The cooking appliance thus advantageously achieves a particularly good cooking result that automatically adapts to an amount of food to be cooked, with energy-efficient steam generation, without the need for complex electronics.

It is a further development that the cooking appliance is a household appliance. It is a further development that the cooking device is an oven, a microwave device or a combination thereof. In a further development, the oven can consequently also have a microwave functionality in addition to the steam treatment functionality. The oven can be a component of a range.

The fact that the cooking appliance has a steam treatment functionality includes in particular that the cooking appliance has at least one operating mode or operating setting in which the evaporator can be operated during a cooking process together with at least one cooking space heating element or is set up to be operated in this way ("added steam") Operating mode). The cooking appliance can, however, also have at least one further operating mode in which only at least one cooking space heating element can be operated, i.e. without using the evaporator, but possibly with activated microwave functionality, if available. The cooking appliance can also have a pure steam treatment operating mode, in which only the evaporator can be activated, but no cooking space heating element.

The cooking space is delimited by a cooking space wall and typically has a loading opening on the front. A cooking space heating element can be located in the cooking space or outside the cooking space behind the cooking space wall.

It is a further development that the at least one oven heating element comprises at least one heating element from the group of lower heating elements, upper heating elements, grill heating elements and / or ring or hot air heating elements, but is not limited to them. The design and (e.g. individual or combined) operation of such radiators is known in principle and is therefore not discussed further here. Certain operating modes can be assigned certain cooking space heating elements or combinations thereof. Alternatively, a user can individually set the oven heating elements to be used during a cooking process.

It is a further development that the evaporator is an evaporator arranged outside the cooking chamber. This has the advantage that the amount of steam generated by the evaporator depends only on the output of the at least one evaporator heating element and practically not on the cooking space temperature. The water in the evaporator is heated by the at least one - advantageously exactly one - evaporator heating element and the steam that is then produced is introduced into the cooking space. The evaporator can be a so-called boiler or a flow heater. However, the evaporator can also be an evaporator tray which is introduced into the bottom of the cooking space at least one dedicated evaporator radiator is assigned.

The at least one oven heating element and the at least one evaporator heating element are different heating elements, the at least one oven heating element not being intended to specifically heat the water in the evaporator, and the at least one evaporating heating element not being intended to to specifically heat the cooking space.

The at least one oven heating element, the at least one evaporator heating element and the temperature switch are in particular connected between the same power supply lines. The power supply lines can be connected to a direct voltage or an alternating voltage.

Because the at least one oven heating element and the at least one evaporator heating element are each electrically connected in series with the mechanically switching temperature switch, it is achieved in particular that, when the added steam operating mode is selected, the at least one evaporator heating element only during a cooking process is then energized or switched on when the selected at least one cooking space heating element is also energized or switched on. A current supply to the at least one evaporator heating element for a period of time during which no cooking chamber heating element is supplied with electricity or switched on is not provided for the added steam operating mode, in particular also no alternating current supply or activation.

It is an embodiment that the temperature switch is a capillary tube switch. The capillary tube switch is advantageously inexpensive and robust and is also known and well-engineered for regulating the temperature of ovens by means of temperature-dependent clocking of the oven heating elements. The energization of the at least one evaporator heating element can therefore be controlled via a capillary tube switch, which is already usually located in particularly inexpensive ovens. There is no need for complex - in particular independent - electronics for operating, in particular for regulating, the cooking space heating element. The capillary tube switch has, in a basically known manner, a capillary tube which mechanically switches an associated electrical switch as a function of temperature. This switch is electrically connected in series with the radiators. The capillary tube actuates the switch at the set cooking space temperature, the set cooking space temperature being able to be set in a basically known manner, e.g. through a user-adjustable rotating linkage. The user can e.g. operate a rotary knob.

In one embodiment, a temperature limiter is assigned to the at least one evaporator heating element. This has the advantage that overheating of the at least one evaporator heating element, e.g. due to idling when water is used up, and thus its damage can be avoided. The temperature limiter is designed to interrupt a current flow through the at least one evaporator heating element when a predetermined limit temperature is reached. The limit temperature is preferably above the temperature at which water boils in the evaporator, e.g. 5 ° C, 10 ° C or 20 ° C above this temperature.

If a temperature limiter is present, the control phase can be divided into a vapor phase and a subsequent drying phase. The vapor phase has already been described above as the control phase. In the heating phase and in the vapor phase there is usually enough water in the evaporator that it does not run dry. If there is still a sufficient amount of water in the evaporator at the desired end of the cooking time, the cooking process is consequently ended during the steam phase.

If, on the other hand, the cooking process takes so long that the water in the evaporator is consumed and the evaporator is idling, the steam phase changes to the drying phase. During the drying phase, the at least one selected cooking space heating element is operated analogously to the steam phase. The energization of the at least one evaporator radiator, however, is superimposed by a clocking of the current limiter: when idling, the temperature of the at least one evaporator radiator increases noticeably due to the lack of water, to or above a predetermined limit value of the temperature limiter. Then the temperature limiter is triggered and interrupts a power supply to the at least one evaporator heating element. The at least one evaporator radiator then cools down again below the limit temperature, which means that the temperature limiter switches on again, etc. The at least one evaporator radiator is thus only energized in the drying phase if both the temperature switch and the temperature controller switch electrically. Towards the end of the cooking process, all of the water has evaporated, which is advantageous for preventing the formation of germs etc. in the evaporator.

In one embodiment, the temperature limiter is connected electrically in series or in series with the associated evaporator heating element and in particular in parallel with the at least one cooking space heating element. This enables a particularly simple electrical connection. If the temperature limiter is opened when the limit temperature is reached or exceeded, the current flow to the at least one assigned evaporator heating element is interrupted and this is thus switched off. This enables particularly energy-efficient operation of the evaporator.

If the evaporator has several evaporator radiators, each of the evaporator radiators can be assigned its own temperature limiter. Alternatively, a single temperature limiter can be electrically connected in series with all of the evaporator radiators.

It is an embodiment that the temperature limiter is connected electrically in series with a first part of the at least one evaporator heater and is connected electrically in parallel with a second part of the at least one evaporator heater, so that when the temperature limiter limitation is activated, only the second part can be energized. As a result, when the limit temperature is reached, not the entire evaporator radiator is switched off, but only the first part, so that a heating output of the evaporator drops, but is not switched off to zero. The reduced power of the evaporator is advantageously dimensioned so that damage to the evaporator is avoided.

It is an embodiment that the temperature limiter is a mechanically switching temperature sensor, e.g. a bimetal switch. This can advantageously be implemented simply and inexpensively and also provides a precisely defined switching time. In addition, the advantage is thus achieved that already existing overheating protection devices can often be used and a dedicated temperature sensor connected to switching electronics can be dispensed with.

It is a further development that the temperature limiter is or has at least one PTC resistance element connected electrically in series with at least one evaporator heater and / or is or has at least one NTC resistance element connected electrically in parallel with at least one evaporator heater. This advantageously enables a gradual adjustment of the evaporator output to the temperature of the at least one evaporator heating element. The PTC resistance element or PTC thermistor component has, as the current conductor, PTC material, which shows a noticeably stronger temperature dependence than the metallic heating conductor material that is usually used. So it is a dedicated temperature-dependent resistor that belongs to the group of thermistors.

In one embodiment, the at least one evaporator heating element is a PTC heating element, i.e. its electrical resistance heating element (s) consists or consist of a dedicated PTC material. As an alternative or in addition to providing a temperature limiter, a gradual adaptation of the evaporator output to the temperature of the at least one evaporator heating element can be achieved (“self-exciting heating element”).

PTC material has a positive temperature coefficient and conducts electrical current better at low temperatures than at high temperatures. The PTC material can, for example, be a ceramic-based material with a non-linear resistance curve, e.g. Barium titanate.

It is an embodiment that at least one cooking space heating element is designed as a tubular heating element. This has the advantage that particularly robust and inexpensive radiators are used. It is a further development that all cooking space heating elements are designed as tubular heating elements. However, at least one cooking space heating element can also be designed as a printed, sprayed etc. band heating conductor, e.g. in thick-film technology.

The at least one evaporator radiator can e.g. be designed as a tubular heater, band heating conductor, etc.

It is an embodiment that the cooking device is designed as an oven and a mechanical selector switch, e.g. Rotary switch, for selecting among several oven operating modes, which oven operating modes differ by different connection or selection of the radiators. This supports an inexpensive construction of the cooking appliance that is easy to implement in terms of construction. For example, when selecting the “bottom heat” oven operating mode, only the bottom heat radiator from the group of basically available cooking space radiators is switched on or can be energized. The circuits of the other cooking space heating elements are or remain interrupted or de-energized.

In a further development, at least one added steam operating mode can be selected by means of the mechanical selector switch, in which the at least one evaporator heating element is switched on. Alternatively, only different oven heating elements can be activated or switched on by means of the mechanical selector switch, and steam functionality can be activated by means of a further switch, e.g. a toggle, push button or push switch, can be activated.

• - zunächst mindestens ein einen Garraum heizender Garraum-Heizkörper und mindestens ein Verdampfer-Heizkörper eines Verdampfers gemeinsam mittels eines mechanisch schaltenden Temperaturschalters, der eine Garraumtemperatur abfühlt, bestromt werden, und
• - dann, wenn ein dem mindestens eine Verdampfer-Heizkörper zugeordneter Temperaturbegrenzer auslöst, der mindestens eine Verdampfer-Heizkörper stromlos geschaltet wird.

The object is also achieved by a method for operating a cooking appliance, in particular an oven with steam treatment functionality, in the case of a combined oven / steam treatment operation

• - First of all, at least one cooking chamber heating element that heats a cooking chamber and at least one evaporator heating element of an evaporator are supplied with current together by means of a mechanically switching temperature switch that senses a cooking chamber temperature, and
• - When a temperature limiter assigned to the at least one evaporator heater is triggered, the at least one evaporator heater is de-energized.

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

In general, the present invention has the advantage that an advantageous operation of the evaporator in an added steam operating mode can be implemented in a simple mechanical cooking appliance, in particular an oven, without additional electrical or mechanical components.

• 1 zeigt als Schnittdarstellung in Seitenansicht eine Skizze eines Gargeräts in Form eines Backofens mit Dampfgarfunktionalität;
• 2 zeigt einen Schaltplan oder Ersatzschaltbild zur Schaltung eines Garraum-Heizkörpers und eines Verdampfer-Heizkörpers in einer Added-Steam-Betriebsart; und
• 3 zeigt ein Schaltdiagramm eines Verdampfers des Backofens aus 1.

The properties, features and advantages of this invention described above and the manner in which they are achieved will become clearer and more clearly understood in connection with the following schematic description of an exemplary embodiment which is explained in more detail in connection with the drawings.

• 1 shows, as a sectional illustration in side view, a sketch of a cooking appliance in the form of an oven with steam cooking functionality;
• 2 shows a circuit diagram or equivalent circuit diagram for switching a cooking space heater and an evaporator heater in an added steam mode; and
• 3 shows a circuit diagram of an evaporator of the oven from 1 .

1 shows an oven 1 with steam treatment functionality. The oven 1 has a cooking space 2 on, by means of several oven heating elements 3 , 4th is heatable. From the oven radiators 3 , 4th are a bottom heat radiator here 3 and a top heat radiator 4th drawn. However, there can also be additional heating elements such as a ring heating element and a grill element (not shown). The oven compartment radiator 3 , 4th can in particular be designed as conventional tubular heating elements.

The oven 1 also includes a conventional mechanical selector switch 5 on, by means of which operating modes can be set, the different cooking space radiators 3 , 4th and / or use combinations thereof, eg "bottom heat", "top heat", "grill", "hot air" etc. The selector switch 5 can use a rotary knob on the front 6th which is connected to a switch box (not shown) via a transmission rod. The cooking space 2 has a front loading opening 7th on that by means of a door 8th is lockable.

The oven 1 also has one outside of the cooking space 2 arranged evaporator 9 on that of an evaporator radiator 10 having. Using the evaporator heater 10 , which can be built up in thick-film technology, for example, can be installed in the evaporator 9 located water W. heat. The resulting steam D. is then in the oven 2 initiated. The use of the evaporator 9 During a cooking process, a user can use the selector switch, for example 5 or another switch can be activated. It is possible to set at least one added steam operating mode in which there is at least one oven heating element 3 , 4th the cooking space 2 is heated as well as the evaporator 9 is operated.

The evaporator radiator 10 is a temperature limiter 11 , here for example in the form of a mechanically switching temperature sensor such as a bimetal switch, assigned to the evaporator radiator 10 when a predetermined limit temperature is reached or exceeded Tw switches off, for example by opening an associated circuit. The limit temperature Tw is typically above the temperature at which the water W. in the evaporator 9 boils, but below a temperature at which the evaporator 9 could be damaged. The temperature drops Tv on the evaporator radiator 10 at or below the limit temperature Tw the temperature limiter will 11 switched on again, for example closed.

For regulating a cooking space temperature Day in the oven 2 to a set cooking space temperature Ts is in the oven 2 a mechanically switching temperature switch in the form of a capillary tube switch 12 available. The capillary tube switch 12 switches when the set cooking space temperature is reached or exceeded Ts by the selector switch 5 Cooking cabinet heating element selected or energized for the current operating mode 3 , 4th out. If the set cooking space temperature falls Ts again below the set cooking space temperature Ts , become the oven cavity radiators 3 , 4th switched on again or energized. The result is a regulation of the cooking space temperature Day to the set cooking space temperature Ts through temperature-dependent switching on and off or clocked operation of the oven heating elements 3 , 4th .

Electronics for operating the oven 1 is in particular not required here, which makes it particularly inexpensive and robust.

2 shows a circuit diagram or equivalent circuit diagram of the oven heating element 3 and the evaporator radiator 10 in an added steam operating mode of the oven 1 , namely "Bottom heat with" Added Steam ". However, other oven heating elements can also be used. If there are several cooking space radiators 3 , 4th these can, for example, be connected electrically in parallel to one another. The oven compartment radiator 3 is here as a resistance heater with an electrical resistance R1 drawn. The evaporator radiator 10 is here as a resistance heater with an electrical resistance R2 drawn.

The oven compartment radiator 3 and the capillary tube switch 12 are electrically in series between two power supply lines L. , N switched. These power supply lines L. , N can a live line L. and a neutral line N and, for example, provide an electrical direct voltage or an electrical alternating voltage between them. By opening and closing the capillary tube switch 12 When the power supply is switched on, the oven heating element 3 flows through or the current flow is interrupted.

The evaporator radiator 10 is electrically parallel to the oven heating element 3 and electrically in series with the capillary tube switch 12 switched. The temperature limiter 11 is electrically in series with the evaporator radiator 10 and electrically in parallel with the oven heating element 3 switched.

3 shows a circuit diagram of an evaporator controlled during an added steam operation 9 of the oven 1 . The circuit diagram is as a timing diagram D1 shown, which is an energization state of the evaporator radiator 10 , plotted against a time t in min, shows. The current state is standardized and can have the states "1" / "On" - in which the evaporator radiator 10 is energized - and "0" / "Off" - in which the evaporator radiator 10 is not energized - assume. Above it are two temperature curves and against time t applied, namely a course of the oven temperature Day and a profile of the temperature Tv on the evaporator radiator 10 .

The exemplary added steam cooking process begins at a point in time t = 0, in which the operating mode and a set cooking space temperature Ts (here from approx. 180 ° C) have been set. An initial value of the actual cooking space temperature Day in the oven 2 is room temperature (approx. 25 ° C).

Since the oven temperature Day below the set cooking space temperature Ts is the capillary tube switch 12 until the target oven temperature is reached Ts permanently closed. This phase is also called the heating phase P1 designated. During the heating phase, there is thus in the evaporator 9 located water W. brought to boiling temperature and then continuously supplied with heat, so that comparatively large amounts of steam D. be generated.

When the target oven temperature is reached Ts (here at t = 5 min) the heating phase starts P1 in a control phase P2 over. In the regular phase P2 opens and closes the capillary tube switch 12 alternately with passing through the set cooking space temperature Ts , so that the oven heating element operates synchronously 3 and the evaporator radiator 10 results. Steam continues to enter the cooking space 2 introduced what is also called the vapor phase P2-1 can be designated, but in smaller quantities than during the heating phase P1 . Will that be in the oven 2 Any food (not shown) is cooked as long as there is still water W. in the evaporator 9 the cooking process will continue during the steam phase P2-1 completed.

As in the heating phase P1 and the vapor phase P2-1 enough water W. in the evaporator 9 is its limit temperature Tw not reached.

Will the water W. in the evaporator 9 but consumed before the end of the cooking process ("idle"), increases shortly before or at idle when the evaporator heating element is energized 10 its temperature Tv up to or above the limit temperature Tw on. This triggers the temperature limiter 11 off and interrupts the circuit of the evaporator radiator 10 until the temperature Tv again below the limit temperature Tw has cooled down. This sub-phase of the control phase P2 can also be used as a drying phase P2-2 are designated.

In the drying phase P2-2 becomes the oven heating element 3 analogous to the vapor phase P2-1 clocked with current or switched on. The evaporator radiator 10 however, it is only energized when the temperature limiter 11 and the capillary tube switch 12 are electrically connected. This will make the vaporizer 9 advantageously dried, but not overheated. Drying the evaporator 9 is advantageous to prevent the formation of germs or the like. in a damp environment when the oven is not in use 1 to avoid.

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

In general, “a”, “one” etc. can be understood as a singular or plural number, in particular in the sense of “at least one” or “one or more” etc., unless this is explicitly stated excluded, e.g. by the expression "exactly one" etc.

A number can also include exactly the specified number and a customary tolerance range, as long as this is not explicitly excluded.

List of reference symbols

1

oven

2

Cooking space

3

Bottom heat radiator

4th

Top heat radiator

5

Selector switch

6th

Rotary knob

7th

Loading opening

8th

door

9

Evaporator

10

Evaporator radiator

11

Temperature limiter

12

Capillary tube switch

D.

steam

D1

Timing diagram

L.

Power supply line

N

Power supply line

P1

Heating phase

P2

Control phase

P2-1

Vapor phase

P2-2

Drying phase

R1

resistance

R2

resistance

t

time

T

temperature

Day

Oven temperature

Ts

Set cooking space temperature

Tv

Temperature on the evaporator radiator

Tw

Limit temperature

W.

water

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 0277337 A2 [0002]
• EP 2789923 A1 [0003]

Claims (11)

Cooking appliance (1), in particular an oven, with steam treatment functionality - A cooking space (2) which can be heated by means of at least one cooking space heating element (3, 4), and - An evaporator (9) in which the water (W) located can be heated by means of at least one evaporator heater (10), in which - At least one oven heating element (3, 4) and at least one evaporator heating element (10) are connected electrically in parallel to one another and electrically in series with a mechanically switching temperature switch (12). Cooking appliance (1) Claim 1 , wherein the temperature switch (12) is a capillary tube switch. Cooking appliance (1) according to one of the preceding claims, wherein a temperature limiter (11) is assigned to the at least one evaporator heating element (10). Cooking appliance (1) Claim 3 , wherein the associated temperature limiter (11) is electrically connected in series with the at least one evaporator heating element (10). Cooking appliance (1) Claim 3 , wherein the temperature limiter (11) is connected electrically in series with a first part of the at least one evaporator heating element (10) and is connected electrically in parallel with a second part of the at least one evaporator heating element (10), so that when the limitation is activated Temperature limiter (11) only the second part can be energized. Cooking device (1) according to one of the Claims 3 to 5 , wherein the temperature limiter (11) is a mechanically switching temperature sensor. Cooking appliance (1) according to one of the preceding claims, wherein the at least one evaporator heating element (10) is a PTC heating element. Cooking appliance (1) according to one of the preceding claims, wherein at least one cooking space heating element (3, 4) is designed as a tubular heating element. Cooking appliance (1) according to one of the preceding claims, having a mechanical selector switch (5) for selecting among several oven operating modes which differ in the different electrical connection of at least the oven heating elements (3, 4), at least one oven operating mode comprising a steam treatment functionality which of the at least one evaporator heating element (10) is switched on. Cooking appliance (1) Claim 9 , wherein the at least one evaporator heating element (10) is electrically connected in series with a mechanical selector switch (5) and, in order to activate the steam treatment functionality, the selector switch (5) can be brought into a switch position in which it energizes the at least one evaporator heating element (10) allows. Method for operating a cooking appliance (1) in the form of an oven with steam treatment functionality, in the case of a combined oven / steam treatment operation - First of all, at least one cooking chamber heating element (3, 4) that heats a cooking space (2) and at least one evaporating heating element (10) of an evaporator (9) together by means of a mechanically switching temperature switch (12) which senses a cooking space temperature (Tg), be energized, and - When a temperature limiter (11) assigned to the at least one evaporator heating element (10) is triggered, the at least one evaporator heating element (10) is de-energized.

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