BE1030256B1 - Cooking device with cooking chamber and camera for observing the cooking chamber - Google Patents

Abstract

The present invention relates to a cooking appliance (1) with a housing and a cooking space (3) arranged in the housing, the cooking space (3) being delimited by cooking space walls (4.1, 4.2, 4.3, 4.4), in the housing outside the cooking space (3) a camera (15) is arranged for observing the cooking chamber (3), wherein in a first area of the cooking chamber walls (4.1, 4.2, 4.3, 4.4) there is a first viewing window (9.1) between the camera (15) and the cooking chamber ( 3) is embedded, wherein the first viewing window (9.1) has cooling on a side facing away from the cooking space (3), characterized in that the first viewing window (9.1) through a transparent substrate (20) and a on the substrate (20) Catalytic layer (21, 23) applied on the cooking chamber side is formed for decomposing organic contaminants, the catalytic layer (21, 23) being formed in a transparent layer thickness (d). With this cooking device (1) an improved view for the camera (15) can advantageously be achieved.

Description

1 BE2022/5077

Cooking device with cooking chamber and camera for observing the cooking chamber

Technical area

The invention relates to a cooking appliance with a housing and one in which

Housing arranged cooking space, with the cooking space through

Cooking chamber walls are limited, being in the housing outside the

Cooking chamber a camera is arranged for observing the cooking chamber, wherein in a first area of the cooking chamber walls a first viewing window is embedded between the camera and the cooking chamber, and wherein the first viewing window has cooling on a side facing away from the cooking chamber. In particular, the cooking appliance is designed as an oven with a pyrolysis function.

Background of the invention

Cooking appliances such as ovens in which the cooking chamber walls

Viewing windows are already known. On the one hand, it is well known that such cooking appliances have viewing windows in a mostly vertical position

Front, especially in a cooking chamber door, are provided through which one

The person using the cooking appliance can see through it, for example around the

Observe or check the cooking process of a food. It is also known that viewing windows are arranged in the cooking chamber walls between the cooking chamber and a camera, for example in a horizontal cooking chamber ceiling that delimits the cooking chamber at the top. Such a camera serves, for example, as a sensor for controlling the cooking appliance, such as an automatic switch-off depending on what is detected by the camera

Cooking level of a food to be cooked or automatic browning of the food to be cooked and/or allows a person using it to observe the cooking space from a distance via a terminal device.

In the case of the aforementioned cooking appliances, cooling is used in the area of

Camera ensures reduced temperatures compared to the cooking chamber

2 BE2022/5077 to prevent damage to the camera. The cooling also requires a reduced temperature compared to the rest of the cooking space on a side of the first viewing window facing the cooking space, which in certain cases

Operating states of the cooking appliance are disadvantageous

Decomposition temperature for organic contaminants not reached and a

Polymerization of these contaminants on the first viewing window causes contamination, which results in contamination on the first viewing window that is very difficult to remove. In particular, such contamination occurs during pyrolysis cleaning of the cooking appliance with very high temperatures above 400 ° C in the cooking space, in which sufficient decomposition temperatures for the organic contaminants are not achieved at the first viewing window due to the reduced temperatures. The dirt then hinders the camera's clear view through the first viewing window, so that control of the cooking device using the camera and/or observation of the food to be cooked on a terminal device are disrupted. In particular, such

Contamination, even to a small extent, causes distortion of a color spectrum passing through the first viewing window, which hinders control of the cooking appliance by the camera.

From US 2018/0073741 A1 an oven is known in which

Cooking chamber walls have a coating with hydrophilic and/or lipophilic

Properties are applied to remove impurities in the area

Coatings accumulate and reduce in other areas of the oven. Cleaning the oven can then focus on the areas of the

Coatings can be reduced. The coating will be in some

Embodiments combined with a catalytic coating and a heating layer to remove accumulated contaminants.

Furthermore, transparent photocatalytic ones are known from the prior art

Coatings are known for various technical applications, for example

EP 1 585 658 A1, JP 2000-131747 A or US 2014/319491 A1.

Description of the invention

3 BE2022/5077

Based on the background of the invention, it is an object of the present invention to provide an improved cooking appliance

To ensure visibility for the camera.

The object of the invention is achieved by the features of the independent

Main claims resolved. Advantageous refinements are in the

Subclaims specified. If technically possible, the teachings of the

Subclaims can be combined as desired with the teachings of the main and subclaims.

In particular, the task is solved by a cooking appliance described above, in which the first viewing window is through a transparent

Substrate and a catalytic applied to the substrate on the cooking chamber side

Layer for decomposing organic contaminants is formed, wherein the catalytic layer is formed in a transparent layer thickness.

Advantageous aspects of the claimed invention are explained below and preferred modified embodiments of the invention are explained below

Invention described. Explanations, especially regarding advantages and

Definitions of characteristics are essentially descriptive and preferred, but not limiting, examples. If an explanation is limiting, this will be expressly mentioned.

As far as elements are designated using a number, for example “first component”, “second component” and “third component”, this is the case

Numbering is intended purely for differentiation in the designation and does not represent a dependency of the elements on each other or a mandatory one

Sequence of the elements. This means in particular that a device does not have to have a “first component” in order to be able to have a “second component”. The device can also have a “first component” and a “third

Component” include, but without necessarily having a “second component”.

There can also be multiple units of a single element

Numbering must be provided, for example several “first components”.

4 BE2022/5077

A cooking appliance is designed in particular as an oven, in which the

Preparation of a food, for example, temperatures of around 100-250 ° C are provided in the cooking space. The cooking appliance also preferably has one

Pyrolysis function, in which the temperature in the cooking chamber is increased to up to 500 ° C, so that organic substances located on the cooking chamber walls

Contaminants are broken down and released from the cooking chamber walls.

Organic contaminants arise when cooking food, particularly through fats and oils that dissolve from the food and stick to it

Remove the cooking chamber walls. The cooking appliance can also be designed as an oven with an integrated microwave.

The cooking space of the cooking appliance is preferably as a cavity insulated from an outer wall of the cooking appliance by means of thermal insulation

Housing formed. The cooking space can preferably have an opening

Food can be filled with food or such food can be removed via the opening

removed from the cooking space. In or on the cooking space there are preferably means for heating the air in the cooking space and means for

Circulation of the air in the cooking chamber is provided. In particular, there are also air lines and/or in the cooking space or in the cooking space walls

Air baffles are provided, the geometry of which influences the air flow in the oven. The term air is also used here in the sense of vapors located in the cooking space, for example when food is in the cooking space and emits corresponding substances and steam into the air. Furthermore, means for radiating heat can be provided in the cooking space.

The first viewing window is sealed in particular with respect to the cooking space wall in which it is embedded, so that no air from the cooking space gets past the first viewing window into the area of the camera. The camera is preferably located above the food to be cooked, i.e. above an upper cooking chamber wall that extends in a horizontal plane, and is directed downwards towards the food to be cooked. Such positioning allows a particularly good view of the food being cooked. In this respect, the first viewing window is one

Has cooling, this can be cooling only for the first viewing window or cooling that also includes other areas or components around it

Camera and/or the camera itself cools. In particular, the cooling is as

Air cooling is formed, with cooled air circulating around the camera in an air volume adjacent to the first viewing window, so that the cooled air 5 flows along the side of the first viewing window facing away from the cooking space. Alternatively, the cooling can also be liquid cooling. The first

Viewing window can also be designed as a part of a multiple pane on the cooking chamber side, with a coolant in the spaces between the

flows along the windows.

The above solution to the problem now includes the teaching that the first

Viewing window has a catalytic layer. By means of such a catalytic layer, it is possible to reduce the decomposition temperature of organic contaminants located at the first viewing window.

In this way the organic contaminants get to the first

Viewing window decomposes more easily, especially at temperatures at which polymerization of the impurities would occur without a catalytic layer. In particular, there is no polymerization of the contaminants when the cooking appliance is cleaned by pyrolysis with cooking chamber temperatures above 400 ° C and the organic ones deposited on the first viewing window

Instead, impurities are broken down. The first viewing window is therefore only contaminated to a reduced extent, so that an improved view for the camera can be achieved, in particular even after a large number of use and/or cleaning cycles. The catalytic layer is formed with a transparent layer thickness and therefore, particularly advantageously, has no relevant influence on the view through the first viewing window. Such a transparent layer thickness can vary depending on the material or materials used for the catalytic layer

materials can be chosen. A layer thickness at which the catalytic layer produces a sufficient catalytic effect and at the same time remains transparent can be achieved with materials that have sufficient

6 BE2022/5077

Have temperature resistance, especially for during a

Pyrolysis cleaning in the temperatures prevailing in the cooking chamber.

In a preferred embodiment, the cooking appliance has an opening

Filling the cooking space and at least one cooking space door to close it

Opening, with the cooking chamber door forming a cooking chamber wall, in which

A second viewing window is embedded in the cooking compartment door, and the second one

Viewing window through a transparent substrate and a catalytic layer applied to the substrate on the cooking chamber side for decomposing organic

Impurities are formed, the catalytic layer being formed in a transparent layer thickness. In particular, the catalytic

Layer on the second viewing window may be formed in the same manner and from the same material or materials as the catalytic layer on the first viewing window. The surface on the cooking chamber side of the second viewing window also becomes contaminated with organic contaminants. In particular, on the second

Viewing window also removes dirt in a similar way to the first one

Viewing windows are created by the polymerization of organic impurities, since the second viewing window is on a side facing away from the cooking space

The environment of the cooking appliance is in contact and depending on the air temperature in this

Environment on the cooking chamber side of the second viewing window can have a reduced temperature compared to the rest of the cooking chamber. Through the catalytic

Layer on the second viewing window can achieve the same advantages that are also achieved by the catalytic layer on the first viewing window, so that contamination on the second viewing window is reduced or avoided and the view through the second viewing window, for example for one in front of the cooking door standing person, is improved.

In one embodiment of this embodiment, the second viewing window has cooling on a side facing away from the cooking space. In this case, the second viewing window is on the cooking chamber side opposite the remaining one

The cooking chamber has particularly low temperatures, so that the problem is solved

Polymerization of organic impurities in particular

7 BE2022/5077 exists. The catalytic layer therefore achieves particularly great advantages in this embodiment by avoiding contamination. The

Cooling of the second viewing window can be carried out, for example, as air or

Be designed with liquid cooling. In particular, the second viewing window is designed as a part of a multiple pane on the cooking chamber side, with a coolant in

Flows along the spaces between the panes.

In a particularly preferred form, the catalytic layer of the first

Viewing window and / or the second viewing window at least one platinum metal, in particular platinum, palladium, iridium and / or ruthenium. By means of such

Platinum metals have a very good catalytic effect even on thin ones

Layer thicknesses are achieved so that the catalytic layer can be applied to the substrate thin enough to be transparent. Furthermore, platinum metals have a particularly high temperature resistance, so that there is no risk of damage to the catalytic layer even when carrying out pyrolysis cleaning at temperatures between 400 ° C and 500 ° C.

Furthermore, the catalytic layer of the first viewing window and/or the second viewing window preferably has at least one metal oxide, in particular

Copper oxide, magnesium oxide and/or manganese oxide. Even with those

Metal oxides have a very good catalytic effect even on thin ones

Layer thicknesses are achieved so that the catalytic layer can be applied to the substrate thin enough to be transparent. Furthermore, metal oxides have a particularly high temperature resistance, so that there is no risk of damage to the catalytic layer even when carrying out pyrolysis cleaning at temperatures between 400 ° C and 500 ° C.

The catalytic layer preferably has a plurality of substances, in particular at least one platinum metal and at least one metal oxide, in order to provide particularly favorable catalytic properties for a specific one

Set temperature range.

8 BE2022/5077

In one embodiment, the layer thickness of the catalytic layer of the first viewing window and/or the second viewing window is between 80 nanometers and 1500 nanometers. With such a layer thickness, depending on the material or materials used for the catalytic layer, a sufficient catalytic effect to avoid contamination can be achieved, the catalytic layer being transparent. This is preferred

The layer thickness is chosen to be as thick as possible given the existing transparency in order to make the catalytic layer as long-lasting as possible.

In a preferred embodiment, the catalytic layer is the first

Viewing window and / or the second viewing window by a spraying process

Diving process, an ALD process, a PVD process, a CVD process and / or a sputtering process applied. By means of the methods mentioned, a catalytic layer can be formed in a transparent layer thickness and sufficiently adherent to the substrate. It says so

ALD stands for “atomic layer deposition” and describes a process for depositing extremely thin layers, up to atomic monolayers, on one

Source material. PVD stands for “physical vapor deposition” and describes a vacuum-based process in which the material for the catalytic layer is transferred into the gas phase and condenses on the substrate to form the catalytic layer. CVD stands for “chemical vapor deposition” and describes a process in which the catalytic layer is deposited from the gas phase on a heated surface of the substrate as a result of a chemical reaction. In sputtering processes, atoms are removed from a solid by bombardment with high-energy ions and go into the

Gas phase over. The sputtering process can be used in particular in connection with the PVD process for transferring the material for the catalytic

Layer in the gas phase can be used.

In a further preferred embodiment, at least one of the first viewing window and the second viewing window has a carrier layer between the substrate and the catalytic layer. Such a carrier layer is particularly preferred as a porous layer or a frit for receiving the

9 BE2022/5077 catalytic layer and can be used, for example

To increase binding force between the catalytic layer and the substrate.

The support layer can also serve to form a framework for the catalytic layer, so that the surface area of the catalytic layer is increased for improved mass transport. The catalytic layer is understood to be applied to the substrate, even if it is applied to the carrier layer. The carrier layer particularly preferably has at least one silicon oxide, such as silicon dioxide. The carrier layer can optionally be applied to the substrate in a coating process that precedes the coating with the catalytic layer, or the carrier layer and the catalytic layer can be applied to the substrate at the same time in a common coating process. In one embodiment in which the carrier layer is applied to the substrate in advance of the catalytic layer, it is particularly preferably baked before the catalytic layer is applied to the substrate. Baking achieves a particularly good bond between the carrier layer and the substrate. To the extent that the carrier layer and the catalytic layer are applied together, they can also form a combined layer that fulfills the function of a carrier layer and the function of the catalytic layer. A combined layer is understood, on the one hand, as a catalytic layer applied to the substrate and, on the other hand, as being arranged between the catalytic layer and the substrate

Backing layer.

In a further preferred embodiment, the substrate is the first

Viewing window and / or the second viewing window made of glass. When used as a substrate, glass offers the particular advantages of being transparent, having good temperature resistance and compared to catalytic

Layer and / or the carrier layer is chemically inert.

Brief description of the drawings

10 BE2022/5077

The invention is explained below with reference to the attached

Drawings explained in more detail using preferred exemplary embodiments. The

Formulation Figure is abbreviated as Fig. in the drawings.

Show in the drawings

1a shows a schematic sectional view through a cooking appliance according to one aspect of the invention;

Fig. 1b shows a detail from Fig. 1a;

Fig. 1C shows a further detail from Fig. 1a;

2a shows a schematic representation of a viewing window for a cooking appliance according to an aspect of the invention in a first embodiment;

Fig. 2b is a schematic representation of a viewing window for a

Cooking appliance according to one aspect of the invention in a second

embodiment; and

Fig. 2c is a schematic representation of a viewing window for a

Cooking appliance according to one aspect of the invention in a third

Embodiment.

Detailed description of the exemplary embodiments

The exemplary embodiments described are merely examples that can be modified and/or supplemented in a variety of ways within the scope of the claims.

Each feature described for a particular embodiment may be used alone or in combination with other features in any other embodiment. Any feature that is described for an embodiment of a particular claim category can also be described in a corresponding manner in an embodiment of another

Claim category can be used.

11 BE2022/5077

Figure 1a shows a cooking appliance 1 designed as an oven with a housing (not shown) and a cooking space 3 arranged in the housing.

The cooking chamber 3 has an upper side through a first cooking chamber wall 4.1, a lower side through a second cooking chamber wall 4.2, a front side through a third cooking chamber wall 4.3 and a rear side

Side limited by a fourth cooking chamber wall 4.4, with the cooking chamber 3 continuing to a right by cooking chamber walls, not shown

side and limited to a left side. There is one in the cooking chamber 3

Food carrier 5 arranged on which food 6 rests. The

Cooking chamber walls 4.1, 4.2, 4.4 can be insulated from the housing in a manner not shown.

The third cooking chamber wall 4.3 is formed by a cooking chamber door 7, whereby the

Cooking chamber door 7 can be swung open to open or close an opening 8 of the cooking chamber 3. The cooking chamber door 7 has a handle 7.1 and a second viewing window 9.2 embedded in it, the second viewing window 9.2 being designed as the inner one of three panes of multiple glazing and being sealed against the door 7 by means of a seal 10.

A camera 15 is arranged above and outside the cooking chamber 3, which is surrounded by a cooling air volume 16, in which, for example, cooling air compressed by a compressor (not shown) circulates, such as by means of two

indicated by arrows. The cooling air can be cooled using means not shown, such as a heat exchanger and/or a heat pump. Between the camera 15 and the cooking chamber 3 there is a first viewing window 9.1 in the first

Cooking chamber wall 4.1 embedded, wherein the first viewing window 9.1 can be sealed from the first cooking chamber wall 4.1 by means of a seal, not shown. The first viewing window 9.1 borders the cooking chamber 3 with one side of the cooking chamber and the side facing away from the cooking chamber 3

Cooling air volume 16. The camera 15 is directed downwards and observes the food 6 located in the cooking chamber 3 through the first viewing window 9.1, as indicated by a viewing cone of the camera 15.

12 BE2022/5077

Figure 1b is a detailed view from Figure 1a, in which the area around the camera 15 is shown. It can be seen that the first viewing window 9.1 is formed by a transparent substrate 20 and a catalytic layer 21 applied thereto. The catalytic layer 21 extends over the entire first

Viewing window 9.1 and achieves a reduced decomposition temperature for organic contaminants adhering to the first viewing window 9.1. Such organic contaminants are decomposed in this way at temperatures at which polymerization would otherwise occur and, as a result, contamination of the first viewing window 9.1 that would be difficult to clean. In the same way as in Figure 1b the first viewing window is shown

Figure 1c shows a detailed view from Figure 1a, which shows the cooking chamber door 7.

Here it can be seen that the second viewing window 9.2 also consists of one

Substrate 20 and a catalytic layer 21 applied to the substrate is formed.

Figures 2a to 2c show different embodiments of the first

Viewing window 9.1 and/or the second viewing window 9.2 in a side section.

These each have a substrate 20, wherein the substrate 20 is designed to be transparent. For example, the substrate 20 is formed from glass. In a first embodiment according to Figure 2a there is a catalytic on the substrate

Layer 21 is applied, the catalytic layer 21 being transparent

Layer thickness d. The catalytic layer 21 is formed, for example, from a material comprising a platinum metal and/or a metal oxide. In a second embodiment according to FIG. 2b there is one on the substrate

Carrier layer 22 is applied, the carrier layer 22 being, for example

Has silicon oxide and is in turn formed in a transparent layer thickness. A catalytic layer 21 is again applied to the carrier layer in a transparent layer thickness d, which can be designed corresponding to the catalytic layer 21 according to FIG. 2a. In a third

Embodiment according to Figure 2c is a combined one on the substrate

Layer 23, consisting of a carrier material and one on or in the

Catalytic material introduced into the carrier material is applied.

13 BE2022/5077

List of reference symbols 1 cooking appliance 3 cooking chamber 4.1 first cooking chamber wall 42 second cooking chamber wall 4.3 third cooking chamber wall 4.4 fourth cooking chamber wall 5 food support 6 food 7 cooking chamber door 7.1 handle of the cooking chamber door 8 opening 9.1 first viewing window 9.2 second viewing window 10 seal 15 camera 16 cooling air volume

Substrate 21 catalytic layer 20 22 carrier layer 23 combined layer d layer thickness

Claims (12)

14 BE2022/5077 patent claims 1. Cooking appliance (1) with a housing and a cooking space (3) arranged in the housing, the cooking space (3) being delimited by cooking space walls (41, 42, 4.3, 4.4), in the housing outside the cooking space (3) a camera (15) is arranged for observing the cooking chamber (3), a first viewing window (9.1) being inserted between the camera (15) and the cooking chamber (3) in a first area of the cooking chamber walls (4.1, 4.2, 4.3, 4.4). is, wherein the first viewing window (9.1) has cooling on a side facing away from the cooking chamber (3), characterized in that the first viewing window (9.1) is formed by a transparent substrate (20) and a catalytic layer applied to the substrate (20) on the cooking chamber side Layer (21, 23) is formed for decomposing organic contaminants, the catalytic layer (21, 23) being formed in a transparent layer thickness (d). 2. Cooking appliance (1) according to one of the preceding claims, having an opening (8) for filling the cooking space (3) and at least one cooking space door (7) for closing the opening (8), the cooking space door (7) having a cooking space wall (4.3 ), wherein a second viewing window (9.2) is embedded in the cooking space door (7), and wherein the second viewing window (9.2) is formed by a transparent substrate (20) and a catalytic layer (21, 23) applied to the substrate (20) on the cooking space side ) is formed for decomposing organic contaminants, the catalytic layer (21, 23) being formed in a transparent layer thickness (d). 3. Cooking appliance (1) according to one of the preceding claims, wherein the second viewing window (9.2) has cooling on a side facing away from the cooking space (3). 4. Cooking appliance (1) according to one of the preceding claims, wherein the catalytic layer (21, 23) of the first viewing window (9.1) and / or the second 15 BE2022/5077 viewing window (9.2) has at least one platinum metal, in particular platinum, palladium, iridium and / or ruthenium. 5. Cooking appliance (1) according to one of the preceding claims, wherein the catalytic layer (21, 23) of the first viewing window (9.1) and / or the second viewing window (9.2) has at least one metal oxide, in particular copper oxide, magnesium oxide and / or manganese oxide. 6. Cooking appliance (1) according to one of the preceding claims, wherein the layer thickness (d) of the catalytic layer (21, 23) of the first viewing window (9.1) and / or the second viewing window (9.2) is between 80 nanometers and 1500 nanometers. 7. Cooking appliance (1) according to one of the preceding claims, wherein the catalytic layer (21, 23) of the first viewing window (9.1) and / or the second viewing window (9.2) by a spraying process, a dipping process, an ALD process, a PVD -Process, a CVD process and/or a sputtering process is applied. 8. Cooking appliance (1) according to one of the preceding claims, wherein at least one of the first viewing window (9.1) and the second viewing window (9.2) has a carrier layer (22) between the substrate (20) and the catalytic layer (21, 23). , in particular a porous layer or a frit to accommodate the catalytic layer (21, 23). 9. Cooking appliance (1) according to claim 8, wherein the carrier layer (22) has at least one silicon oxide. 10. Cooking appliance (1) according to claim 8 or 9, wherein the carrier layer (22) is baked on the substrate (20) before the catalytic layer (23) is applied. 11. Cooking appliance (1) according to one of the preceding claims, wherein the substrate (20) of the first viewing window (9.1) and / or the second viewing window (9.2) is made of glass. 16 BE2022/5077 12. Cooking appliance (1) according to one of the preceding claims, designed as an oven, in particular as an oven with a pyrolysis function.