EP3728955A1

EP3728955A1 - Cooking device with a specifically designed catalyst device, and method for producing a cooking device

Info

Publication number: EP3728955A1
Application number: EP18807978.4A
Authority: EP
Inventors: Belen DIAZ BENITO; Gerhard Schmidmayer
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2017-12-18
Filing date: 2018-11-23
Publication date: 2020-10-28
Anticipated expiration: 2038-11-23
Also published as: DE102017223090A1; CN111448422B; WO2019120874A1; CN111448422A; EP3728955B1; US20210071877A1; US11885504B2

Abstract

The invention relates to a cooking device (1) comprising a catalyst device (12) that has a base unit (15), which is made of an electrically conductive material and on which a plurality of catalytically active elements (16) or a catalytically active surface coating of the catalyst device (12) is arranged, and comprising an electric energy unit (13), by means of which the base unit (15) can be supplied with electric energy for a self-heating process of the catalyst device (12). The base unit (15) has electric connection regions (17, 18) for connecting the electric energy unit (13), and the electric connection regions (17, 18) are at least partly made of a pressed material region of the base unit (15) and/or at least partly have an electrically conductive adhesive (19). The invention also relates to a method.

Description

Cooking appliance with a specifically designed catalyst device and method for producing a

cooking appliance

The invention relates to a cooking appliance with a catalyst device, which a

Base unit made of an electrically conductive material. On this material is a variety of catalytically active elements or a catalytically active

Surface coating arranged. The cooking appliance furthermore has an electrical energy unit with which the base unit can be supplied with electrical energy for self-heating of the catalyst device. The base unit has electrical connection areas for connecting the electrical energy unit. Furthermore, the invention also relates to a method for producing a cooking appliance.

In cooking appliances having a cooking chamber, on the one hand by walls,

for example, a muffle is limited, and moreover through a door of

Cooking device is closed, occur during operation and thus when preparing

Food fumes or odors. These are by the

Preparation process of the food occurring in the oven and are discharged from the oven. The same can also be provided in a cooking appliance, which has a pyrolysis operation, whereby corresponding odors can also occur in such a pyrolysis operation. Since these exhaust gases, referred to as vapor streams, are also led out of the cooking appliance, they thus also reach the surroundings of the cooking appliance and thus into kitchen areas or living areas.

To reduce this odor from escaping from the cooking appliance

Wrasenströmen it is known that catalyst devices are used in a cooking appliance. For example, this is from EP 1790910 A2 and the

EP 2093490 A1. In the known embodiments, however, the self-heating is limited because the connection options for the electrical energy unit are limited, so that, where appropriate, the electrical energy transfer is limited.

It is an object of the present invention to provide a cooking appliance and a method in which the electrical power supply of a catalyst device of the

Cooking device is improved.

This object is achieved by a cooking appliance and a method according to the independent claims.

One aspect of the invention relates to a cooking appliance with a catalyst device. The catalyst device has a base unit made of an electrically conductive material. On this electrically conductive material, a plurality of catalytically active elements or a catalytically active surface coating is applied, wherein the catalytically active elements or the surface coating also

Part of the catalyst device are. The cooking appliance furthermore has an electrical energy unit with which the base unit can be supplied with electrical energy for self-heating of the catalyst device. The basic unit of

Catalyst device has electrical connection areas for connecting the electrical energy unit. These electrical connection regions are at least partially formed by a pressed material region of the base unit and / or at least partially formed by a partial region of the base unit, in the material of which an electrically conductive adhesive is additionally formed. By such

Design are specific zones of this base unit, namely exactly those areas where the electrical energy unit is physically connected, improved. On the one hand, these are designed to be more mechanically stable, and on the other hand, the general connectability is thereby improved. In particular, it is improved by these embodiments with a pressed material region and / or in addition to the material region of the base unit impregnated with electrically conductive adhesive allows the electrical energy from the electrical energy unit to the

Base unit to transfer. As a result, an energy-efficient operation of the catalyst device is then made possible and the losses of electrical energy are reduced. In particular, the proportion of generated electrical energy can then also be used Energy are more extensively and directly transferred to the base unit, so that the electrical energy unit can also be smaller, if necessary. By thus improving the electrical energy transfer to the base unit through these very specifically designed terminal areas, self-heating is also enabled more efficiently.

Especially in the embodiment in which the material of the base unit itself is locally compressed, it is thus no longer necessary to make the base unit of a variety of different materials. This also saves on manufacturing costs and reduces the complexity of the base unit. It can thus be formed in this embodiment advantageously the base unit of a uniform, electrically conductive material, which then locally individually has different density and just at the locations that form the terminal areas, a higher material density is generated defined.

In the alternative embodiment, the advantage is also given, as mentioned above, because here, the base unit can also be provided from an advantageous electrically conductive material, which then no longer needs to be processed with regard to an individual dense production of this material, but this Material can then be supplemented at specific local points with a completely defined other material, namely the electrically conductive adhesive. As a result, the material density, which is higher in comparison to the remaining area of the base unit, and thus a greater massiveness of these areas is then produced, so that the higher mechanical stability and, in particular, significantly improved transmission of electrical energy are also made possible here in a very defined manner.

In an advantageous embodiment, it is provided that the base unit of a

Foam body is formed. The electrically conductive material is thus advantageously a porous foam body. By such a configuration, the weight is significantly reduced and significantly improved by the foam body, which then has a much larger surface area than a solid body, the catalytic effect. Especially with such a configuration, the individual machining of areas can then be achieved particularly advantageously, so that here also the pressed material areas can be generated in a particularly defined and compact manner. It is too then in an alternative embodiment very advantageous to introduce sufficient and circumferentially electrically conductive adhesive, which can then distribute circumferentially in the chambers of this porous structure of the foam body and there remains.

This porous foam body is then soaked with the adhesive quasi

or this adhesive also penetrates circumferentially in the porous structure of the foam body.

Preferably, it is provided that the foam body in the electrical

Terminal areas is pressed and has a greater density than in the remaining area of the base unit.

In particular, it is provided that the foam body in the electrical

Terminal areas impregnated with the adhesive and the adhesive is also on the

Surfaces of the foam body is applied. This also makes the electrical contacting particularly advantageous and allows a very extensive transmission of electrical energy, with very little loss possible.

It is preferably provided that the electrical connection areas each have a solid contact plate made of an electrically conductive material. These

Contact plate is thus formed in particular without porosity and thus porosityless. This embodiment with the solid contact plate may additionally be present in addition to the aforementioned embodiments. However, it can also be provided that in a further embodiment, only these solid contact plates are present.

Preferably, it is provided that such a contact plate to the base unit, in particular to a foam body of the base unit, non-destructively insoluble, in particular welded or soldered, is. This also allows the above-mentioned advantages to be achieved and a very robust base unit which is advantageous in terms of self-heating is created.

It is preferably provided that the base unit is formed of metal. In an advantageous embodiment, it is provided that this metal is an alloy. By an alloy can in a particularly advantageous manner to the respective

Conditions are received, in particular a comprehensive recording of the transmitted electrical energy and a very fast heating up to relatively high temperatures are possible. In addition, alloys are relatively robust and wear-resistant, so that the functionality of the catalyst device is also permanently high.

In an advantageous embodiment, the metal has nickel. Nickel is particularly advantageous in terms of the above advantages.

If the metal is an alloy, the material may preferably be NiCr and / or NiCrFe and / or NiFeCrAI and / or NiCrAl etc. However, this specific mention is not meant to be exhaustive and it may be provided otherwise metals, especially those which have a high resistance. Preferably, materials may be used that can be heated up to a temperature of at least 250 ° C. The catalytic reaction is an exothermic reaction in which temperatures above 250 ° C and sometimes up to temperatures above 500 ° C can be achieved. Especially in pyrolysis such high temperatures are achieved, so that the material of the base unit must withstand these temperatures easily and permanently. The materials of which the base unit is formed should also have high electrical resistance. In addition, the materials should have a corresponding high heat capacity to be heated based on the Joule effect. The materials should preferably also have a high thermal conductivity in order to be heated very quickly.

In advantageous embodiments, the material of the base unit is designed with a correspondingly high porosity. There should also be flexibility in an advantageous embodiment in which this material has different pore sizes. There should be a large surface, especially given by the corresponding porosity. The largest possible surface area makes the contact between the catalytically active elements or the surface coating and the vapor stream from the cooking chamber particularly effective, so that the catalytic effect can be particularly advantageous. In addition, through such an open Cell structure, which is given by the porosity, also generates a turbulent air flow or Wrasenstrom in the catalyst device, whereby the contact between the catalytically active elements or the corresponding surface coating and the Wrasenstrom, in particular the molecules that produce the pollution or odor is possible.

Preferably, the catalyst device is designed as a flat cylinder. As a result, it can be used particularly advantageously in a channel of an exhaust-carrying system of the cooking appliance and can also completely fill this flow cross-section. As a result, a particularly advantageous catalytic effect is achieved.

Preferably, the cooking appliance has an exhaust air duct, with which an exhaust air stream or a vapor stream produced in the cooking chamber during operation of the cooking appliance can be discharged from the cooking appliance, wherein the catalyst device is arranged in the exhaust air duct.

As a result of this configuration of the catalyst device with the base unit made of an electrically conductive material, the direct heating of this catalyst unit can take place via electrical energy. As a result, the operation of the catalyst device is significantly improved and with regard to the catalytic effect very individually and defined adjustable. This has significant advantages compared to

Catalyst devices that are not directly heated by an electrical energy unit and thus not heated by electrical energy, but for example via a hot exhaust air stream, which is generated in the cooking appliance itself.

Due to the above-mentioned embodiment of the catalyst device, in addition to the advantages already mentioned above, an improved temperature distribution in the

Catalyst device can be achieved, so that in particular a more homogeneous temperature distribution prevails. When the catalytic reaction is started, heat is generated by the catalyst device itself, especially due to the external reaction. Due to this fact, the electrical energy supply can then be further reduced or even completely interrupted. This procedure is based on the Joule effect. The base unit is in an advantageous embodiment at the connection areas,

In particular, when there the material area is pressed, thinner compared to those material areas in which the base unit is otherwise formed and which do not represent connection areas for the electrical energy unit.

In particular, it is provided that such a pressed material region is formed on the edge, so that in a cross-sectional view of the base unit at the edge of a corresponding dilution is formed. In one embodiment, in which the base unit with a base material, in particular a porous foam body, is formed of a metallic material and in which then additionally the electrically conductive adhesive is optionally introduced, can also such

However, it may also be in such a configuration, the thickness of the base unit to this electrical

Terminal areas equal to the thickness of the base unit outside the electrical

Be connecting areas.

Another aspect of the invention relates to a method for producing a cooking appliance, in which the cooking appliance is formed with a catalyst device having a base unit made of an electrically conductive material on which a plurality of catalytically active elements or a catalytically active

Surface coating of the catalyst device is arranged. The cooking appliance is also formed with an electrical energy unit, with which the

Base unit can be supplied with electrical energy for self-heating of the catalyst device, wherein the base unit is formed with electrical connection areas for connecting the electrical energy unit. The electrical

Terminal areas are at least partially formed by pressing material areas of the base unit and / or at least partially an electrically conductive adhesive is applied to the base unit in order to generate the terminal areas defined.

The achievable advantages in this regard have already been mentioned above to the cooking appliance.

Advantageous embodiments of the cooking appliance are as advantageous embodiments of

View method, wherein the respective representational components of the cooking appliance then be installed accordingly in the production, and then to produce the corresponding effect in the cooking appliance.

The terms "top", "bottom", "front", "rear", "horizontal", "vertical", "depth direction", "width direction", "height direction" are the positions given when the device is used as intended and disposed of properly Orientations indicated.

Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and feature combinations mentioned above in the description, as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures, are not only in the respectively indicated combination but also in others

Combinations or alone, without departing from the scope of the invention. Thus, embodiments of the invention are to be regarded as encompassed and disclosed, which are not explicitly shown and explained in the figures, however, emerge and can be produced by separated combinations of features from the embodiments explained. Embodiments and combinations of features are also to be regarded as disclosed, which thus do not have all the features of an originally formulated independent claim.

Embodiments of the invention are described below with reference to schematic

Drawings explained in more detail. Show it:

Fig. 1 is a schematic vertical sectional view of an embodiment of a cooking appliance according to the invention;

FIG. 2 shows an illustration of an exemplary embodiment of a catalyst device as installed in the cooking appliance according to FIG. 1; FIG.

FIG. 3 is a sectional view through the catalyst unit according to FIG. 2; FIG.

4 is a sectional view corresponding to FIG. 3 with a configuration different from that of FIGS. 2 and 3 of a catalyst device; and 5 shows a representation according to FIG. 3 and FIG. 4 with a catalyst device that is again different in this respect.

In the figures, the same or functionally identical elements are the same

Provided with reference numerals.

In Fig. 1 in a vertical sectional view (sectional plane is the height direction and the depth direction), a cooking appliance 1 is shown, which may be, for example, an oven or a microwave oven or a Dampfgargerät. The cooking appliance 1 may also share some of these functions and / or may have one

Have pyrolysis function. The cooking appliance 1, which thus for preparing

Food is formed, has a housing 2, in which a cooking chamber 3 is formed. In the cooking chamber 3 food can be introduced and prepared. The cooking chamber 3 is bounded by walls of a muffle 4, which is accommodated in the housing 2. At the front and thus in the depth direction (z-direction) at the front, the muffle 4 has a feed opening 5, via which access to the receiving space

or cooking chamber 3 is possible. The cooking appliance 1 also has a door 6, which is arranged pivotably on the housing 2 and which is provided for closing the cooking chamber 3. In Fig. 1, the closed state is shown in this regard.

The cooking appliance 1 also has an exhaust duct 7, via which

Wrasen streams that are generated during operation of the cooking appliance 1 and occur in the cooking chamber 3, discharged from the cooking chamber 3 and also from the cooking appliance 1

or can be derived. In particular, it is provided that in the exhaust duct 7, which may be part of an air duct system, a fan 8 arranged in this regard the Wrasenstrom from the receiving space

or the cooking chamber 3 can aspirate and can promote. in the

Embodiment is provided that the exhaust duct 7 at the front, in particular on a side facing the door 6, a discharge opening 9, so that an air flow through this discharge opening 9 towards the front, in particular through a gap 10, can be blown out. The gap 10 is preferably formed between the door 6 and the housing 2, in particular a control panel 11. io

The cooking appliance 1 also has a catalyst device 12, with which a catalysis of the Wrasenstroms can take place. In this way, it is also achieved, in particular, that undesired odors can escape from the cooking appliance 1 and, as a result, cleaning of this vapor stream is thus effected by the catalyst device 12, so that the air flow which flows after the catalyst device 12 and then flows out of the cooking device 1 from the discharge opening 9 , in this regard

odorless or odorless.

The cooking appliance 1 also has an electrical energy unit 13, which is separate from the catalyst device 12. The electrical energy unit 13 is electrically connected to the catalyst device 12, in particular via lines 14. By supplying electrical energy through the electrical energy unit 13 to the catalyst device 12, the catalyst device 12 can be heated directly. As can be seen here, the catalyst device 12 is formed in particular over the entire cross section of the exhaust air duct 7.

FIG. 2 shows a schematic plan view of an exemplary embodiment of a catalyst device 12. The catalyst device 12 has a base unit 15, which is advantageously formed here by a porous foam body of a metal foam. On this base unit 15, a plurality of catalytically active elements 16 or a catalytically active surface coating is applied.

In addition, the base unit 15, which is of cylindrical design, has edge-mounted electrical connection areas 17 and 18. At these electrical connection regions 17 and 18, the electrical energy unit 13, in particular via the lines 14, electrically connected. Both the position and the dimensions of the electrical connection areas 17 and 18 are to be understood as examples only.

Preferably, it is provided that the electrical connection areas 17 and 18 in the embodiment shown here are made of the same material as the rest of the configuration of the base unit 15. This means that the electrical Connecting areas 17 and 18 are also formed here of a porous foam body made of metal. However, it is provided in this exemplary embodiment that these electrical connection regions 17 and 18 are pressed, so that here there is a pressed material region of the porous foam body, which thus has a greater density here than in the regions of the base unit 15 outside this electrical

Connection areas 17 and 18.

In Fig. 3, the catalyst device 12 along the section line III-III in Fig. 2 is shown.

The dimensions, viewed in the direction of the longitudinal axis A of the catalyst device 12, of the electrical connection regions 17 and 18 formed by the pressed material regions are here thinner than the remaining region of the base unit 15.

4, a further embodiment of a catalyst device 12 is shown in a schematic sectional view. In contrast to FIG. 3, this embodiment provides for electrical connection regions 17 and 18 to have an axial thickness which corresponds to the thickness of the remaining region of the base unit 15. In this embodiment, it is provided that the electrical connection areas 17 and 18 are basically formed by the porous foam body made of metal, which is also formed outside of the electrical connection areas 17 and 18 in the base unit 15, in which case these material areas are not pressed or such are pressed, that they nevertheless have a smaller density than in

Embodiment of FIG. 2 and FIG. 3. In addition, it is provided here that for the zonal boundary definition of the electrical connection areas 17 and 18, an electrically conductive adhesive 19 is introduced so that the porous foam body is quasi soaked with this electrically conductive adhesive 19 here. As a result, then electrical connection areas 17 and 18 are formed. It can be synonymous with this

Embodiment be provided with the electrically conductive adhesive 19, that the defined electrical connection portions 17 and 18 are thinner in the axial direction than the remaining area of the base unit 15, so at least slightly pressed.

In addition, a further exemplary embodiment of a catalyst device 12 is shown in FIG. 5 in a further schematic representation. In this embodiment, it is provided that the electrical connection areas 17 and 18 are formed by solid and thus virtually non-porous contact plates 20 and 21. You can especially in Supplement to the embodiments three and four may also be provided in addition. These contact plates 20, 21 are welded to the foam body in particular.

LIST OF REFERENCE NUMBERS

1 cooking appliance

2 housings

3 cooking space

4 muffles

5 feed opening

6 door

7 exhaust duct

8 fans

9 drain opening

10 gap

1 1 control panel

12 catalyst device

13 electrical power unit 14 line

15 base unit

16 catalytically active element

17 electrical connection area

18 electrical connection region 19 electrically conductive adhesive

20 contact plate

21 contact plate

Claims

claims

1. Cooking appliance (1) with a catalyst device (12), which has a base unit (15) made of an electrically conductive material, on which a plurality of catalytically active elements (16) or a catalytically active

Surface coating of the catalyst device (12) is arranged, and with an electrical energy unit (13), with which the base unit (15) with electrical energy for self-heating of the catalyst device (12) can be supplied, wherein the base unit (15) electrical connection portions (17, 18 ) to the

Connecting the electrical energy unit (13), characterized

in that the electrical connection regions (17, 18) are formed at least partially by a pressed material region of the base unit (15) and / or at least partially have an electrically conductive adhesive (19).

2. cooking appliance (1) according to claim 1, characterized in that the base unit (15) is formed of a porous foam body.

3. Cooking appliance (1) according to claim 2, characterized in that the foam body in the electrical connection areas (17, 18) is pressed and has a greater density than in the remaining area of the base unit (15).

4. cooking appliance (1) according to claim 2 or 3, characterized in that the

Foam body in the electrical connection areas (17, 18) is impregnated with the adhesive (19) and the adhesive (19) at least on the surfaces of

Foam body is applied.

5. cooking appliance (1) according to one of the preceding claims, characterized

characterized in that the electrical connection areas (17, 18) each have a solid contact plate (20, 21) made of an electrically conductive material.

6. Cooking appliance (1) according to claim 5, characterized in that a contact plate (20, 21) to the base unit (15), in particular to a foam body of the base unit (15), welded or soldered.

7. cooking appliance (1) according to one of the preceding claims, characterized

characterized in that the base unit (15) is formed of metal.

8. cooking appliance (1) according to claim 7, characterized in that the metal is an alloy.

9. cooking appliance (1) according to claim 7 or 8, characterized in that the metal comprises nickel.

10. Cooking appliance (1) according to one of the preceding claims, characterized

characterized in that the catalyst unit (12) is designed as a flat cylinder.

1 1. cooking appliance (1) according to one of the preceding claims, characterized

in that the cooking appliance (1) has an exhaust air duct (7), with which an exhaust air flow generated in the cooking chamber (3) during operation of the cooking appliance (1) can be discharged from the cooking appliance (1), wherein the catalyst device (12) in the exhaust air duct (7) is arranged.

12. A method for producing a cooking appliance (1), wherein the cooking appliance (1) with a catalyst device (12) is formed, which has a base unit (15) made of an electrically conductive material on which a plurality of catalytically active elements (16 ) or a catalytically active

Surface coating of the catalyst device (12) is arranged, and with an electrical energy unit (13) is formed, with which the

Base unit (15) with electrical energy for self-heating the

Catalyst device (12) can be supplied, wherein the base unit (15) with electrical connection areas (17, 18) for connecting the electrical energy unit (13) is formed, characterized in that the electrical connection areas (17, 18) at least partially by pressing of material areas of the base unit (15) are formed and / or at least proportionately an electrically conductive adhesive (19) is applied to the base unit (15).