WO2023110251A1 - Appareil de cuisson pourvu d'une isolation spécifique d'un élément chauffant à l'extérieur de la chambre de cuisson - Google Patents

Appareil de cuisson pourvu d'une isolation spécifique d'un élément chauffant à l'extérieur de la chambre de cuisson Download PDF

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Publication number
WO2023110251A1
WO2023110251A1 PCT/EP2022/081776 EP2022081776W WO2023110251A1 WO 2023110251 A1 WO2023110251 A1 WO 2023110251A1 EP 2022081776 W EP2022081776 W EP 2022081776W WO 2023110251 A1 WO2023110251 A1 WO 2023110251A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating element
cooking appliance
muffle
exemplary embodiment
heating
Prior art date
Application number
PCT/EP2022/081776
Other languages
German (de)
English (en)
Inventor
Julien Adam
Christophe Cadeau
Olivier Hoffmann
Original Assignee
BSH Hausgeräte GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Hausgeräte GmbH filed Critical BSH Hausgeräte GmbH
Publication of WO2023110251A1 publication Critical patent/WO2023110251A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements
    • F24C7/067—Arrangement or mounting of electric heating elements on ranges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/34—Elements and arrangements for heat storage or insulation

Definitions

  • the cooking appliance has a housing and a muffle which is arranged on the housing.
  • the muffle delimits a cooking space of the cooking appliance with walls.
  • Cooking appliances for example an oven or a microwave cooking appliance or a steam cooking appliance, have a metal muffle.
  • the walls are designed to be as thin as possible.
  • heating elements or radiators can be arranged both within the cooking chamber, as can be the case, for example, with top heat radiators and/or grill radiators.
  • heating elements can also be arranged outside the muffle, as can be the case, for example, with underheating heaters.
  • heating elements that are resistance heaters a great deal of heat is also transferred directly to the walls of the muffle in this context. This can also result in deformation of the muffle.
  • top heat radiators can also be arranged outside of the cooking chamber. This is known, for example, from DE 10 2010 039 342 A1.
  • a cooking appliance is also known from US 2019/0045590 A1, which has a top-heating element that is made up of several separate heating units.
  • the cooking appliance has a housing. This can also be referred to as the outer housing.
  • the cooking appliance also has a muffle. This is a separate component from the housing.
  • the muffle is arranged in the housing. The muffle delimits a cooking space of the cooking appliance with walls. In particular, this cooking chamber is directly delimited at least in certain areas by the walls of the muffle.
  • the cooking appliance has at least one heating element.
  • the heating element is in particular configured in the form of a strand or rod and bent several times.
  • the at least one heating element is arranged outside the muffle. In particular, it is arranged in an intermediate space between the housing and the muffle. In particular, the heating element is arranged in this intermediate space at a distance from a wall of the muffle which faces the heating element and is adjacent thereto. The wall is the wall of the muffle closest to the heating element.
  • the cooking appliance has a distancing unit. This is intended to be designed and provided to position the heating element at a defined or discretely specified distance from this wall of the muffle in this intermediate space.
  • a heating element is therefore arranged outside of the cooking chamber, which is also positioned in the intermediate space in a defined manner without contact with the outside of the wall of the muffle.
  • the position of the heating element relative to this wall can be set and specified with particular precision.
  • the surface which is oriented parallel to this wall of the muffle is in particular the one in which the heating element with its strand-like and coiled shape extends flatly.
  • the heating element is arranged to run at least 80%, in particular at least 90%, in this extension area.
  • this distancing unit is arranged between the heating element and the wall. This enables the direct coupling between the distancing unit and the heating element and the muffle. This also achieves very precise positioning and mechanically stable attachment.
  • this position can also be permanently set precisely by such a distancing unit.
  • the position relative to the wall which can then possibly also deform, can be maintained very evenly or with small tolerances.
  • the distancing unit has distancing rods. These are oriented with their longitudinal axes protruding at least in sections from the area which is spanned by the main area of the heating element in terms of size.
  • this surface can be flat or curved.
  • the rods are therefore mainly not oriented in the plane or extend mainly not in the plane in which mainly extends the heating element.
  • a very filigree distancing unit can be created by distancing rods. This means that it can be designed to save space and also be lighter.
  • correspondingly mechanically stable elements are also provided by rods, which can maintain this desired defined distance of the heating element from the adjacent wall of the muffle. In this regard, rods are also very insensitive to the heat that occurs, so that unwanted deformation of the rods can be avoided.
  • distancing rods particularly precise mechanical couplings with other components of the cooking appliance can also be achieved by means of such distancing rods. This results in mechanically stable connections.
  • the distancing unit can also be arranged in the cooking appliance in a precise location and in a fixed position. The appropriate length can also be set very precisely by orienting the distancing rods. This again results in a very precise adjustment of the distance from the heating element to the wall of the muffle.
  • At least one distancing rod has a bend at one end that faces away from the heating element. This bend is formed as a seated coupling part.
  • the bend represents, in particular, a freely cantilevered end piece of the distancing rod.
  • the spacing unit sits with this bend on a side of a counter-coupling element of the cooking appliance that faces the heating element.
  • this sitting down is provided with regard to a distance-adjusting coupling.
  • this bend sits directly on this facing side of a counter-coupling element.
  • a rod is then used here as an element of the distancing unit, in one exemplary embodiment this bending can nevertheless not only achieve point contact, but line contact with this facing side of the counter-coupling element.
  • a mechanically stable coupling is thereby made possible.
  • a mechanically more stable coupling and an improved position fixation are also achieved as a result.
  • the bend is arranged at an angle of between 80° and 100°, in particular between 85° and 95°, with respect to the rest of the area of this distancing rod adjoining it to the rear.
  • Such an angling of the distancing rod also in turn enables a very stable and uniform seating on this facing side of the counter-coupling element.
  • At least one distancing rod has a bend at one end that faces away from the heating element.
  • this bend is formed as a rear-engagement coupling part.
  • this coupling part that engages behind the distancing unit rests in the mounted state on a side of a counter-coupling element of the cooking appliance that faces away from the heating element and engages behind it.
  • this mechanical coupling is provided for distance-adjusting coupling, in particular directly.
  • Such a coupling that engages behind enables a mechanically stable and very precisely positioned connection of the distancing unit to the counter-coupling element. A very exact position security is thereby supported.
  • This fixing of the position and precise arrangement of the distancing unit on the counter-coupling element is particularly advantageous when both a distancing rod with a rear-engagement coupling part and another distancing rod with a seating coupling part are realized. Because then the counter-coupling element can be mechanically contacted quasi from both sides with a respectively corresponding bent part of distancing rods. A particularly stable mechanical connection is thereby achieved. In particular, it is then also possible for these two bends to form a clamped or clamped mount for the distancing unit on the counter-coupling element. As a result, the securing of the position and the mechanically stable attachment are achieved in a particularly advantageous manner. In particular, if deformations and/or changes in position could occur during operation of the heating element due to high heat, this mechanical connection is particularly advantageous in order to allow or counteract corresponding deformations and changes in position, if at all minimal.
  • the counter-coupling element has a continuous recess, in particular one that is open at the edge.
  • the distancing rod extends through this recess with a rod part formed before the bending, so that the engaging behind coupling part adjoining the rod part is arranged on the side of the counter-coupling element facing away from the heating element.
  • That rod part which in particular adjoins the rear-engagement coupling part is thus also arranged in a mechanically stabilized manner.
  • a higher level of security against slipping relative to the counter-coupling element is also achieved as a result.
  • This further supports the position-fixed arrangement of the distancing unit on the counter-coupling element.
  • the counter-coupling element is arranged, in particular clamped, between the seated coupling part and the rear-engagement coupling part.
  • the distancing unit is designed to fix the position of the heating element on at least one counter-coupling element of the cooking appliance in at least two, in particular all three, spatial directions.
  • the distancing unit is coupled directly to the counter-coupling element. This also advantageously supports the mechanically stable arrangement.
  • the spacing unit has a height in a direction perpendicular to that surface which is spanned by the main surface of the heating element, viewed in terms of size, which is many times greater than a thickness of a strand of the heating element.
  • the distancing unit can be positioned flexibly in terms of location, because the corresponding height always allows a sufficient distance to be set between the heating element and the wall of the muffle, which is arranged adjacent to the heating element and in particular extends parallel thereto.
  • the distancing unit can also be arranged directly on elements of the cooking appliance that are not this wall of the muffle, from which the heating element is to be arranged at a distance.
  • the heating element is spaced from the outside of the adjacent wall by the spacer unit at a distance between the 0.8 times and 1.5 times the thickness, in particular the diameter, of a strand of the heating element.
  • the heating element is arranged by the distancing unit at a distance from the outside of the adjacent wall of between 0.3 mm and 0.7 mm, in particular between 0.3 mm and 0.5 mm .
  • Such a distance setting makes it possible for the heating element and the wall to always be arranged without contact with one another, even when the heating element is in operation.
  • this distance is specified in such a way that a particularly high level of heat transfer from the heat generated by the heating element to the wall can take place. A very advantageous transfer of energy and thus a very high level of efficiency with regard to the heating of this wall of the muffle is thereby achieved.
  • a very compact structure can still be achieved, particularly in terms of the height of the cooking appliance.
  • the heating element is arranged in an intermediate space between the top wall of the muffle and the top wall of the housing, viewed in the vertical direction.
  • the cooking appliance has position securing elements which are connected directly to the respective multiple strand sections of the heating element, so that these strand sections are fixed in position in relation to one another. This prevents undesired deformation of the heating element and in particular undesired movement of the strand sections relative to one another. This achieves a particularly advantageous retention of the shape of the heating element.
  • position securing elements are formed as position securing rods.
  • a distancing rod of the distancing unit is arranged at opposite ends of a position securing rod.
  • the distancing bar is arranged at an angle to the end of the position securing bar.
  • a multifunctional component is thus provided by such a position securing rod.
  • it holds the strand sections of the heating element in position relative to one another, on the other hand, it is designed as a direct receiving part for a distancing rod.
  • a position securing rod and a distancing rod are formed in one piece.
  • this can be a metal rod.
  • the distancing bar is arranged with its longitudinal axis at an angle of between 85° and 95° to the longitudinal axis of the position securing bar.
  • a position securing bar and two spacer bars are integrally formed.
  • together they form a U-shaped support and positioning rod.
  • such an overall rod can also be arranged mechanically in the manner of a clamp or as a clamping part on opposite regions of a counter-coupling element, in particular it can be arranged in a clamped manner thereon. This further improves the mount.
  • a support frame can thus also be formed from a plurality of such support and positioning rods.
  • the distancing unit is coupled to at least one counter-coupling element of the cooking appliance for fixing the position.
  • the counter-coupling element is formed as a flange protruding from the outside of the muffle and from the outside.
  • a strip-shaped web is formed that protrudes to the side, particularly in the width direction of the cooking appliance, and represents this counter-coupling element. Provision can be made for such a flange to extend over the entire depth of a wall of the muffle, viewed in the depth direction of the cooking appliance. This can be designed without interruption.
  • the counter-coupling element is inherently stable and rigid. The direct mechanical coupling with a distancing rod, in particular a plurality of distancing rods, in particular with a rear-engagement coupling part and a seating coupling part, is made possible in a particularly stable manner as a result.
  • this flange is offset downwards compared to a top wall of the muffle, which forms the wall adjacent to the heating element, when viewed in the height direction of the cooking appliance.
  • this flange is arranged on an outside of at least one side wall of the muffle.
  • this flange is arranged offset downwards, viewed in the height direction of the cooking appliance, in relation to a trough ceiling of the top wall of the muffle, which forms the wall adjacent to the heating element.
  • this flange is arranged on an outside of a trough collar of a trough-shaped top wall of the muffle.
  • the contact point or the coupling point between a distancing rod and the counter-coupling element is offset downwards compared to this tub ceiling, viewed in the height direction, but is nevertheless formed on the ceiling wall itself.
  • This also improves the mechanical coupling and the positionally fixed arrangement of the distancing unit.
  • the ceiling wall can then also be manufactured and shaped individually and have the flange formed integrally therewith.
  • the heating element is a top heat and/or grill element of the cooking appliance. It is particularly advantageous if the heating element is a resistance heating element. Such heating elements generate thermal energy themselves through the electrical energy supplied. For this purpose, temperatures of the heating element can be greater than 650° C., in particular greater than 700° C. and possibly temperatures of up to or even greater than 750° C.
  • the invention is particularly advantageous precisely in the case of heating elements that are resistance heating elements. This is because when such a heating element is positioned outside of the cooking space, such heat must be generated that the cooking space can also be correspondingly heated indirectly via the muffle wall. Because of the heating element arranged outside the cooking chamber, a correspondingly high thermal energy and thus corresponding heat of the heating element acts directly on the adjacent wall of the muffle.
  • the top wall of the muffle is desired and required to be heated accordingly in order to then in turn be able to emit the appropriate heat into the cooking chamber. Therefore, it is particularly advantageous with such a concept to set a spaced arrangement of such a resistance heating element to the adjacent wall. In particular in order not to produce undesirable thermal effects, in particular undesirable deformations, in particular locally, on the muffle by strand sections lying there. In addition, it is also particularly advantageous in such constellations if the heating element and the muffle are also positioned very precisely relative to one another during operation and remain so.
  • Another independent aspect of the invention relates to a cooking appliance.
  • the cooking appliance has a housing. This can also be referred to as the outer housing.
  • the cooking appliance also has a muffle. This is a separate component from the housing.
  • the muffle is arranged in the housing.
  • the muffle delimits a cooking space of the cooking appliance with walls. In particular, this cooking chamber is directly delimited at least in certain areas by the walls of the muffle.
  • the cooking appliance has at least one heating element.
  • the heating element is in particular configured in the form of a strand or rod and bent several times.
  • the at least one heating element is arranged outside the muffle. In particular, it is arranged in an intermediate space between the housing and the muffle. In particular, the heating element is arranged in this intermediate space at a distance from a wall of the muffle which faces the heating element and is adjacent thereto. The wall is the wall of the muffle closest to the heating element.
  • a thermal shielding unit of the cooking appliance is arranged in the intermediate space. With this, the heating element is thermally shielded from the housing in accordance with the function and purpose.
  • the material of this thermal shielding unit is characterized with a melting point that is higher than the maximum operating temperature of the heating element.
  • This thermal shielding unit therefore has at least a proportion of material that has a temperature value as the melting point that is higher than the maximum operating temperature that can be set for the heating element. This makes it possible in a particularly advantageous manner for such a heating element, which is located outside the cooking chamber and is in particular a resistance heating element, to be particularly advantageously thermally insulated from the housing.
  • thermal shielding is then achieved between the heating element and the housing.
  • this special choice of material for the thermal shielding unit can prevent the material from melting during operation of the heating element. This is particularly advantageous in particular when the thermal shielding unit is arranged in direct contact with the heating element, at least in some areas.
  • Such a structure makes the cooking appliance particularly compact, at least in the vertical direction realized, on the other hand no undesirable impairments of the thermal shielding unit can then occur precisely at these high temperatures of a resistance heater.
  • the material of the thermal shielding unit is at least partially rock wool.
  • the thermal shielding unit is formed entirely of rock wool.
  • This material has a particularly high melting point.
  • the heating element is a resistance heater which can have operating temperatures of up to over 700° C. during operation.
  • the material is needled rock wool.
  • it has an inorganic binder.
  • the material has a density between 80 g/m3 and 120 g/m3.
  • the thermal shielding unit is a mat of fibrous material. This is preferably elastically deformable. This can be adapted to the installation conditions in a particularly advantageous manner. Last but not least, it can be installed in direct contact with the heating element in a particularly advantageous manner.
  • the mat can be shaped in many ways in this context.
  • the thermal shielding unit has a thickness of between 12 mm and 18 mm, in particular between 13 mm and 17 mm, in particular 15 mm.
  • the shielding unit can be made relatively thin. In this way too, on the one hand, installation space can be saved, and on the other hand, sufficient thermal insulation can nevertheless be made possible without the thermal shielding unit being impaired in its function by the heat of the heating element during operation.
  • This thickness is preferably provided in an upper intermediate space area in which a top heat and/or grill element is arranged as a heating element.
  • a further thermal insulation unit for example glass wool, can then also be arranged there. This results in a multi-layer composite of thermally insulating materials that are different.
  • the thermal shielding unit has a thickness of between 35 mm and 45 mm, in particular between 38 mm and 42 mm, in particular 40 mm.
  • this thickness is provided in a lower clearance area, in which a bottom heating element is arranged as a heating element. This then results in the possibility of arranging only this thermal shielding unit. .
  • the thermal shielding unit is in direct contact with the heating element. This can be achieved precisely when the conditions mentioned at the outset, namely the higher melting point of the material of the shielding unit compared to the maximum operating temperature of the heating element, are present.
  • the thermal shielding unit is arranged only on the side of the heating element facing away from the muffle in the intermediate space between the heating element and the housing.
  • the heating element arranged outside the cooking chamber can deliver maximum heating energy to the adjacent wall of the muffle. Thermal insulation would adversely affect the efficiency of the heating element here.
  • the area of the heating element that faces away from the muffle and lies between the heating element and the housing should be thermally insulated as best as possible. This also means that the housing is not undesirably heated and this does not result in any undesired deformations.
  • the heating element is parallel to the next wall of the muffle, which is arranged adjacent to the heating element and extends in particular at least essentially, in particular completely, in terms of area in a surface that is parallel to the main extension surface of the heating element.
  • the thermal shielding unit comprises a metal plate or mesh. This can be designed to be particularly thin, so that a particularly compact structure is realized here.
  • an infrared reflector can also be implemented with a metal plate.
  • a metal plate can be used to protect another thermal insulation element, which is present in one exemplary embodiment and is arranged in the intermediate space between the heating element and the housing, in particular the metal plate and the housing. Therefore, in one embodiment, such a metal plate or a Metal mesh suitable to be used as such a thermal shielding unit.
  • At least one thermal insulation unit that is separate from the thermal shielding unit and/or differs in at least one material parameter is arranged in the intermediate space between the wall of the muffle and the wall of the housing.
  • the wall of the muffle to be considered in each case and the wall of the housing are arranged in planes that are parallel or substantially parallel to one another.
  • a gap or a gap area of the gap is thus considered here in each case, which is delimited by parallel and spaced walls, namely the wall of the muffle on the one hand and the wall of the housing on the other hand. These extend in particular parallel to one another.
  • This thermal insulation unit can in turn achieve an advantageous thermal insulation effect towards the housing.
  • this thermal insulation unit is also only arranged in that area of the intermediate space which lies between the heating element and the wall of the housing.
  • the thermal insulation element is arranged between the thermal shielding unit and the wall of the housing. Due to the thermal shielding unit, this additional thermal insulation element can also be selected functionally and materially in such a way that it has a lower melting point than the maximum operating temperature of the heating element. This thermal insulation element is separated from the heating element by the thermal shielding unit in between. This means that a simpler and possibly more cost-effective thermal insulation material can also be used for this thermal insulation unit.
  • the thermal insulation unit is a mat made of fiber material.
  • it can have glass wool or be made entirely of glass wool.
  • the thermal insulation unit is thicker than the thermal shielding element or the thermal shielding unit.
  • the material of the thermal shielding unit is in particular different, in particular completely different, from the material of the thermal insulation unit.
  • the thermal shield unit and the isolation unit are separate components. However, they can be arranged directly adjacent to each other in the gap.
  • the maximum operating temperature of the heating element is greater than 500°C, in particular greater than 700°C, in particular between 700°C and 800°C.
  • the heating element is a resistance heating element.
  • the heating element is shaped like a strand and bent several times.
  • the heating element is a top heat and/or grill element. It is therefore arranged in an intermediate space between a top wall of the muffle and a top wall of the housing.
  • the cooking appliance has a housing.
  • This housing can also be referred to as an outer housing.
  • the cooking appliance also has a muffle.
  • This muffle is a component of the cooking appliance that is separate from the housing.
  • the muffle is arranged in the housing.
  • the muffle has walls with which it delimits a cooking space of the cooking appliance.
  • the cooking chamber is delimited directly by the walls of the muffle.
  • the cooking appliance has at least one heating element, in particular a strand-like or rod-like heating element that is bent several times in a single plane. This heating element is arranged outside the muffle in a space between the housing and the muffle.
  • the heating element is arranged only in an intermediate space region of the intermediate space which is formed between only one wall of the muffle and only one outer wall of the housing which is at a distance therefrom and is arranged at least essentially parallel thereto.
  • the heating element is essentially formed or extends only in a surface that lies between only one wall of the muffle and only one outer wall of the housing.
  • the heating element has a first strand-like partial heating element, which is formed with multiple bends in a single extension area.
  • the heating element has a second strand-like partial heating element that is bent several times, in particular in a single extension area. The two heating elements are separate parts of the heating element.
  • one partial heating element is surrounded by the other partial heating element.
  • the windings of one heating sub-element are spaced apart around the other heating sub-element.
  • the partial heating elements can be operated independently of one another in possible operating modes and can be operated together in a further operating mode. This means that the cooking appliance has at least three different operating modes with regard to the modes of operation of the heating element.
  • a first operating mode for example, the first partial heating element can be operated and thus activated.
  • the second heating sub-element is then deactivated.
  • the first partial heating element can be deactivated and the second partial heating element can be operated or activated.
  • both the first partial heating element and the second partial heating element can be activated at the same time.
  • At least one of the partial heating elements has a maximum possible heating output that is greater than or equal to 2 kW.
  • one exemplary embodiment can provide for the two partial heating elements to have a total maximum heating output of greater than or equal to 3 kW in the further operating mode in which they are both operated simultaneously.
  • a heating element arranged outside of the cooking chamber it is thus possible for a heating element arranged outside of the cooking chamber to be arranged compactly and locally, on the other hand having at least two separate partial heating elements which are also arranged specifically to one another. Precisely these at least two partial heating elements of a heating element are provided. This basically enables a more flexible and variable mode of operation of the heating element.
  • such a heating element can also be used particularly advantageously as a grill heater be used for a cooking appliance. Due to such high provided heating power is thus significantly expands the possible uses of a heating element.
  • a heating element is then locally stationary in this respect, it can be used in a wide variety of ways in the cooking appliance due to the number of components, their arrangement relative to one another and the specific heat output values. A compact construction with a reduced number of components can then also be made possible as a result.
  • a maximum heating power of one heating sub-element is less than the maximum heating power of the other heating sub-element.
  • two identical heating elements are not used.
  • the purpose of use of such a heating element can thus be designed extensively, and a wide variety of operating modes can be made possible.
  • a relatively high maximum heating output of the heating element can then also be made available with just one of the two partial heating elements.
  • the further operating mode can be implemented by the at least two partial heating elements of the heating element being operated simultaneously.
  • a lower heating output is required, only that partial heating element can be operated which has the lower maximum heating output compared to the other.
  • very energy-efficient operation can also be made possible in all operating modes of the heating element.
  • a configuration of the heating elements can then always be selected for operation, which provides the required heating output in line with requirements and in an energy-saving manner.
  • the maximum heating output of the partial heating element with the greater maximum heating output is at least 50%, in particular at least 60%, in particular at most 90% greater than the maximum heating output of the partial heating element with the lower heating output.
  • the maximum heating outputs not only differ minimally from one another, but also differ by at least half this percentage. This means that the advantages mentioned above are met to a particularly high degree.
  • the maximum heat output of the partial heating element with the lower maximum heat output is between 1.0 kW and 1.5 kW. In particular, this maximum heat output is between 1.1 kW and 1.3 kW, in particular 1.2 kW. It is precisely this range of values that makes it possible to use the partial heating element alone for a very specific and relatively large number of cooking processes. This maximum heating output is therefore not so small that this one partial heating element alone would only be sufficient in exceptional cases.
  • the maximum heat output of the heating sub-element with the greater maximum heat output is between 2.0 kW and 2.5 kW.
  • this maximum heating power is between 2.1 kW and 2.3 kW.
  • a partial heating element is thus provided which, viewed on its own, has a relatively high maximum heating output. This also makes it possible to carry out a wide range of preparation processes with this one partial heating element alone, in which higher heating outputs are required.
  • the heating element can also be used as a grill heating element of the cooking appliance.
  • the first sub-heating element surrounds the second sub-heating element, with the first sub-heating element having a greater maximum heating power than the second sub-heating element.
  • the first partial heating element with the greater maximum heating output is the outer partial heating element viewed in the projection plane.
  • the greater heating output can be distributed more evenly over a larger volume space.
  • the emission source is then not as locally concentrated as it is in the case of the second, inner heating sub-element in this projection plane. Therefore, such an arrangement is particularly advantageous for the larger heating outputs for a needs-based and more even or more homogeneous delivery.
  • the respective geometry or the course of the strands of the individual partial heating elements is particularly advantageous. On the one hand, this is considered individually in order to achieve a very needs-based and uniform delivery of the heating power, and on the other hand, in combination, to be able to effect a very advantageous and locally individual delivery of the heating power.
  • the strand shape of the entire strand of a partial heating element in particular the partial heating element that is inner in the projection plane, has an asymmetrical H-shape. It is precisely this shape that results in the advantages already mentioned above, on the one hand considered by itself and, on the other hand, in combination with the other partial heating element.
  • the strand shape of the entire strand of a partial heating element is formed with two L-shaped strand sections, which are formed as hollow L shapes by the course of the strands.
  • these two L-shaped, in particular hollow L-shapes are arranged mirror-symmetrically to one another with respect to a central axis of symmetry of the heating element.
  • this axis of symmetry is parallel to the electrical connection end pieces of the two partial heating elements.
  • the heating element has a greater areal density at the edge than in the center when viewed in the extension area.
  • the partial heating elements are arranged correspondingly to one another, in particular matched to this by their specific strand courses.
  • a heating element of this cooking appliance is a top heat and/or grill heating element cooking appliance.
  • a heating element of the cooking appliance as is formed according to the aspect mentioned above or is further developed in an advantageous exemplary embodiment, can also be a bottom heating element. It is therefore possible in one embodiment that only one top heat and/or grill element is designed accordingly. In another exemplary embodiment, only one bottom heating element of the cooking appliance can have a corresponding design.
  • both an upper heating element and/or grill element and a lower heating element of the cooking appliance it is also possible in a further exemplary embodiment for both an upper heating element and/or grill element and a lower heating element of the cooking appliance to be formed accordingly. In such an embodiment, it can then also be possible for the top heat and/or grill element and the bottom heat element to be the same. This can affect both geometric aspects and/or operating parameters or physical parameters of these radiators.
  • At least one temperature sensor of the cooking appliance can be arranged adjacent to the two partial heating elements. In one exemplary embodiment, this can be used to detect the temperature of the entire heating element in the further operating mode. On the other hand, in another operating mode in which only one of the two partial heating elements is activated, the temperature of this partial heating element that is only activated can be detected. In particular, the temperature of the adjacent wall of the muffle is detected with the temperature sensor. Due to the position of the temperature sensor at the same or essentially the same distance from two strand sections of the partial heating elements, the temperature of the wall can be recorded locally at the same point in all operating modes of the heating element.
  • the temperature detection is particularly precise in all operating modes of the heating element.
  • This specific exposed position of a temperature sensor can thus be used to detect the respective temperature of one or more partial heating elements depending on the respective operating mode.
  • This then also makes it possible for the temperature of the respectively active partial heating element to be recorded precisely, so to speak, with a single temperature sensor in different operating modes.
  • an arrangement of temperature sensors with fewer components can then also be provided. So then, for example, only one temperature sensor is used to get into the different operating modes of the heating element to detect the temperature of the respective active heating element.
  • thermosensors which are arranged in a correspondingly exposed manner. These can then also detect the temperature of the at least one activated partial heating element depending on the respective operating mode provided.
  • This cooking appliance has a housing.
  • the housing can also be referred to as the outer housing.
  • the cooking appliance also has a muffle.
  • This muffle is a component of the cooking appliance that is separate from the housing.
  • the muffle is arranged in the housing.
  • the muffle delimits a cooking space of the cooking appliance with walls. In particular, the muffle with walls directly delimits the cooking chamber.
  • the cooking appliance also has at least one heating element which is in particular a strand-like or rod-like heating element which is bent several times in a particular single main extension area.
  • the heating element mainly extends with its dimensions.
  • This heating element is arranged outside the muffle in a space between the housing and the muffle.
  • This heating element is arranged only in an intermediate space region of the intermediate space which is formed between only one wall of the muffle and only one outer wall of the housing which is spaced apart therefrom and is arranged at least essentially parallel thereto.
  • the heating element has a first, in particular strand-like or rod-like, heating sub-element that is bent several times in a single main extension area.
  • the heating element also has a different and separate second, in particular strand-like or rod-like heating element that is bent several times in just a single main extension area.
  • one partial heating element is surrounded by the other partial heating element.
  • Heating element operable independently of the other heating element.
  • these at least two partial heating elements of the heating element are operated together and therefore simultaneously.
  • the at least three different operating modes can be present, as have already been explained above.
  • the cooking appliance preferably has at least one temperature sensor for detecting the temperature of the heating element.
  • the temperature sensor is arranged in the gap area and is arranged adjacent to both heating sub-members and between the heating sub-members. This is the case in particular when viewed in the projection plane.
  • the cooking appliance has in particular at least one temperature sensor at least for detecting the temperature of the wall of the muffle.
  • the temperature sensor is arranged in the gap area and arranged adjacent to both and between the heating part elements. With the one temperature sensor, the temperature of the wall of the muffle can be detected in each of the operating modes of the heating element, in particular at the same point.
  • the temperature sensor is at a distance from the first sub-heating element that is the same or essentially the same as the distance between the temperature sensor and the second sub-heating element. This also applies in particular in the projection plane.
  • a difference in distance in this regard is preferably less than 10% of one of the two distances. In particular, a deviation of less than or equal to 10% of the smaller of the two distances is possible here. In particular, this is measured at the point of the temperature sensor which, viewed along a straight line, has the shortest distance to the respectively adjacent partial heating element.
  • Such a positioning of a temperature sensor makes it possible to record the current temperature of the wall particularly precisely. In particular, not only this information can then be transferred to a control unit of the cooking appliance.
  • this temperature sensor is arranged directly adjacent to an outside of the muffle.
  • the temperature sensor can be tubular, at least in some areas.
  • the temperature sensor is a PT sensor.
  • it can be a PT500 or a PT1000.
  • an electrical supply line to the sensor is arranged in a protected manner relative to the heating element. This can be positional and/or through a corresponding heat-resistant sheathing of the cable or the electrical line. For example, it can also be provided that this electrical line is routed completely through a thermal insulation unit and/or through a thermal shielding unit that is arranged in the intermediate space area. This also enables an advantageous thermal insulation of this cable of the sensor.
  • the cooking appliance has a housing.
  • This housing can also be referred to as an outer housing.
  • the cooking appliance also has a muffle.
  • the muffle is arranged in the housing.
  • the muffle delimits a cooking space of the cooking appliance with walls. In particular, it delimits the cooking space directly with walls.
  • the muffle has a top wall, a bottom wall, a rear wall and side walls. In one embodiment it is provided that the thickness of the side walls is different from the thickness of the bottom wall and/or different from the thickness of the rear wall and/or different from the thickness of the top wall.
  • Such an exemplary embodiment of a muffle is particularly advantageous in order to have as little deformation as possible with the corresponding heat effect of an external heating element.
  • a heating element is arranged outside of the cooking chamber and thus in a space between the muffle and the housing in cooking appliances, it may be necessary, at least in some operating modes, for the heating element to be operated with a particularly high heat output.
  • a heating element which is then in particular a resistance heating element, becomes particularly hot. Accordingly, temperatures of up to more than 700°C can occur here. These temperatures then also act at least partially on adjacent walls of the muffle.
  • the heating element is, for example, a top heat and/or grill heater, so that the adjacent ceiling wall is then also subjected to heat accordingly.
  • this can also be the case for a bottom heating element of the cooking appliance.
  • a corresponding heat also acts on a bottom wall of the muffle.
  • the walls are therefore designed to be thicker or thinner as required, in order to obtain a particularly high degree of dimensional stability, depending on the respective configuration, even with very high heat exposure from outside the muffle.
  • the thickness of the side walls is less than the thickness of the bottom wall. Additionally or instead, the thickness of the side walls may be less than the thickness of the back wall. In particular, in one embodiment, the thickness of the side walls can also be smaller than the thickness of the top wall. Since, according to the possible exemplary embodiment mentioned above, heating elements are arranged adjacent to and above the top wall and/or adjacent to and below the bottom wall of the muffle, these walls of the muffle are exposed to particular heat effects. It is therefore particularly advantageous in this connection if these walls are thicker than the side walls which are arranged further away from the heating elements. Due to the container-like shape of a muffle and the fact that the walls mentioned are directly adjacent to one another, corresponding mechanical stresses and deformation tendencies can also occur or be transmitted here. In order to have the appropriate deformation stability here, it is particularly advantageous if the bottom wall and/or the top wall are thicker than the other walls of the muffle.
  • the thickness of the side walls is between 0.2 mm and 0.5 mm, in particular between 0.25 mm and 0.35 mm, less than the thickness of the bottom wall and/or the thickness of the rear wall and/or the ceiling wall thickness. It is precisely such a difference in values between thinner walls and thicker walls that makes the advantages mentioned above possible to a particular extent.
  • the thinner walls can be designed as required and do not have to be too thick.
  • the thicker walls can be better matched to the possibly greater effects of heat.
  • This difference also avoided that a weight asymmetry in the shape of the muffle would occur undesirably strong. This difference in thickness values is therefore particularly suitable for the functionalities and advantages mentioned.
  • the thickness of the side walls is between 0.4 mm and 0.8 mm, in particular between 0.4 mm and 0.6 mm.
  • the thickness of the bottom wall is between 0.6 mm and 1.0 mm, in particular between 0.7 mm and 0.9 mm. In one exemplary embodiment, it can be provided that the thickness of the top wall is between 0.6 mm and 1.0 mm, in particular between 0.7 mm and 0.9 mm.
  • the muffle is made of metal.
  • the muffle at least on the outside, is at least partially provided with a material that is additional to a base material, such as steel, and has a heat resistance of up to 550°C, in particular up to 530°C.
  • a base material such as steel
  • this applied material is a coating on the outside of a base material of the wall of the muffle.
  • this applied material is enamel with a heat resistance of up to 550°C, in particular up to 530°C.
  • the cooking appliance has a housing.
  • the housing can be referred to as the outer housing.
  • the cooking appliance also has a muffle.
  • the muffle is a separate component from the housing.
  • the muffle is arranged in the housing.
  • the muffle delimits a cooking space of the cooking appliance with walls. In particular, it delimits this cooking space with walls direct.
  • the cooking appliance has at least one first heating element, in particular a strand-like or rod-like one, and in particular a first heating element which is flat and multiply bent in a single main extension area.
  • the heating element is arranged outside the muffle in a space between the housing and the muffle.
  • the first heating element is arranged as a top heat and/or grill heating element in an upper intermediate space area of the intermediate space.
  • This intermediate space area is formed between an upper wall of the muffle viewed in the height direction of the cooking appliance and an upper outer wall of the housing which is spaced apart therefrom and is arranged at least essentially parallel thereto.
  • the cooking appliance has at least one second heating element, in particular a strand-like or rod-like one, which in particular extends in a single main extension area and is bent several times.
  • the second heating element is arranged outside the muffle in a space between the housing and the muffle.
  • the second heating element is arranged as a bottom heating and/or grilling heating element in a lower intermediate space region of the intermediate space viewed in the height direction, the intermediate space region being located between a lower wall of the muffle and a lower outer wall of the housing which is spaced apart therefrom and arranged at least essentially parallel thereto.
  • the first heating element i.e. the upper heating element and/or grill heating element
  • the second heating element i.e. the lower heating element and/or grill heating element
  • a cooking appliance is thus provided which is adapted with regard to a bottom heating element and/or grill heating element and a top heating element and/or grill heating element or these heating elements which are specific in terms of location and function are adapted to one another. This allows heating functions to be improved.
  • the heating elements can also be operated more appropriately as a result.
  • the bottom heat and/or grill heating element or the bottom heat and/or grill heating element can also be used for functions for which it is not suitable in conventional devices.
  • a bottom heating element In particular when modes of operation, in particular with specific heat outputs, are also made possible with the bottom heat and/or grill heating element that were previously not possible. It is thus also possible, for example, for a bottom heating element to be operated in such a way that it is possible in the cooking chamber to also prepare a pizza, for example, on the bottom wall of the muffle. This means that a bottom heating element can now also be provided, which is more or less a pizza-preparation heating element.
  • the bottom heating element can also provide a grill function. This also allows grilling from below.
  • an electrical heating element parameter is a maximum heating power of the entire heating element and/or a maximum heating power of at least one partial heating element of a plurality of partial heating elements of the heating element if a heating element has a plurality of separate partial heating elements.
  • these several, in particular at least two, separate partial heating elements are arranged in a common main extension area or extend with their main extension dimensions areally in this main extension area.
  • These partial heating elements can then be arranged such that they are guided one inside the other in this main extension area, or one partial heating element can surround the other partial heating element at least in certain areas as viewed in this main extension area.
  • the outer heating element surrounds the other, inner heating element with its windings at a distance.
  • a geometric heating element parameter is, for example, a strand length of a heating element and/or a strand length of at least one partial heating element of a plurality of partial heating elements of the heating element.
  • a geometric heating element parameter can also be a profile of a strand shape of the heating element and/or the size of the heating element in a plane.
  • the maximum heating powers of the first heating element and the second heating element can be the same.
  • all electrical heating element parameters and / or all geometric heating element parameters of these two heating elements are the same. They can therefore also be completely identical heating elements in the exemplary embodiment.
  • the maximum heat output of the first heating element is between 3.0 kW and 4.0 kW, in particular between 3.2 kW and 3.6 kW.
  • the maximum heat output of the second heating element can be between 3.0 kW and 4.0 kW, in particular between 3.2 kW and 3.6 kW.
  • the cooking appliance can also be configured with a pizza-preparation operating mode precisely when the bottom-heating element is similar to or the same as the top-heating element, in particular when it enables a corresponding maximum heat output.
  • this increased heat output of the bottom heating element it is then also possible for this increased heat output of the bottom heating element to allow grilling in the cooking chamber, in which the grill heating element is arranged under the bottom wall of the muffle, namely is formed by the bottom heating element .
  • a grilling function with a heating element that delivers the heat output from below for grilling is then made possible.
  • this also achieves pyrolysis operation, which supplies a corresponding heat output from below through the bottom heating element.
  • high-performance cooking with a corresponding heating output from below is also possible. For example, this can be advantageous for the preparation of fruit. In particular, the drying of fruits, such as plums or the like, can then be carried out in the cooking chamber.
  • heating elements are not exposed to the steam and moisture that can occur in the cooking chamber. Corrosion damage to the heating elements can thus be avoided. As a result, a material can then also be used for the heating elements which does not necessarily have to be corrosion-resistant.
  • the cooking appliance has a housing. This can also be referred to as the outer housing.
  • the cooking appliance has a muffle.
  • the muffle is separate from the housing Component.
  • the muffle is arranged in the housing.
  • the muffle delimits a cooking space of the cooking appliance with walls. It delimits this cooking chamber with walls directly.
  • the muffle has a top wall, a bottom wall, a rear wall and side walls as walls. The top wall and the side walls are provided as separate components that are connected with a non-detachable connection.
  • the component can be provided, for example as a separate component from the side walls, which is connected to the side walls with a non-detachable connection.
  • the top wall and/or the bottom wall have a trough shape.
  • Such a modular construction of the muffle allows it to be made more rigid.
  • the module parts which are initially manufactured separately and are provided in the final form in particular, namely the top wall and/or the bottom wall and the side walls separate therefrom, make it possible to design these individual components individually. As a result, these individual components can be individually adapted to the requirements of high rigidity of the entire muffle.
  • non-detachable connections represent interfaces between the individual components of the modular muffle when they are connected to one another.
  • Permanent connections are those that cannot be reversibly formed and broken without damaging or destroying at least one of the components.
  • a permanent connection is, for example, a welded connection. This is also recognizable and identifiable as such on the finished muffle, so that it is also recognized in this context that the individual components of the muffle previously and are therefore already produced in the mold before the non-detachable connection and are then joined together afterwards.
  • both the top wall and the bottom wall have a trough shape.
  • the top wall has a tub ceiling and a tub collar.
  • the tub collar is arranged at the edge of the tub ceiling, at least in some areas, surrounding this tub ceiling.
  • the tub ceiling is curved at least in regions, in particular in the manner of a dome. This curvature of a specific sub-element of the ceiling wall also contributes to better rigidity and greater deformation stability.
  • the bottom wall has a tub floor and a tub collar, which is arranged circumferentially at least in regions on the edge of the tub floor, with the tub floor being curved at least in regions, in particular in the manner of a dome.
  • the corresponding advantages then apply to the bottom wall, as they were mentioned for the above-mentioned advantageous exemplary embodiment relating to the top wall.
  • the tub ceiling has a curvature, so that a distance measured in the height direction between a highest point of the curvature and a lowest point of the tub ceiling is between 10 mm and 15 mm, in particular between 11 mm and 13 mm.
  • this curvature achieves a corresponding stiffening compared to a completely flat tub ceiling.
  • the trough floor can be curved in accordance with the floor wall.
  • the corresponding advantages are then achieved.
  • the top wall has a tub ceiling and a tub collar.
  • the tub collar is arranged circumferentially at least in regions on an edge of the tub ceiling.
  • the tub collar forms the side wall of the tub shape.
  • a flange projecting laterally therefrom is arranged on the tub collar.
  • the flange is in particular formed in one piece with the tub collar.
  • the entire top wall is designed in one piece with the tub ceiling and the tub collar, in particular also with the additional flange that may be present.
  • such a shape of the top wall can be produced by a corresponding forming process from a blank provided, in particular a metal plate. The same can be done with the bottom wall in one embodiment.
  • This protruding flange achieves a further stiffening of the top wall, in particular also of the tub collar.
  • such a laterally protruding flange can also be formed on a trough collar of the base wall.
  • such a flange is a counter-coupling element that is provided for coupling to a spacing unit of the cooking appliance.
  • a distancing unit can then be mechanically coupled directly to this counter-coupling element.
  • the distancing unit is intended in particular to position the heating element at a distance from the adjacent top wall or to position the heating element adjacent to the bottom wall.
  • This flange has a multifunctional design. On the one hand for reinforcement the top wall or the bottom wall, on the other hand for direct mechanical coupling with such a separate distancing unit.
  • the flange is formed on a free edge of the tub collar that faces away from the tub ceiling.
  • this flange is arranged so that it cantilevers outwards from the tub collar and protrudes laterally.
  • This flange is therefore a flat web or a strip-shaped web.
  • a flange can also be at least 50%, in particular at least 60%, in particular at least 70% over the length of a rear section of the tub collar.
  • the side walls of the muffle are connected directly and inseparably to the trough collar.
  • the non-detachable connection for example a welded connection, is then connected directly between an edge of the side wall and the trough collar, for example the top wall and/or the trough collar of the bottom wall.
  • the same can also be provided with the bottom wall in addition to or instead of this.
  • a further improvement in stability can be achieved by such a partial immersion of the side walls into the trough shape of the top wall and/or into the trough shape of the bottom wall, viewed in the vertical direction.
  • the detachable connection can be produced more extensively and/or over a larger area in the context.
  • the corresponding interfaces between the individual module parts of the muffle can also be made more stable and resilient.
  • the thickness of the side walls is different than the thickness of the bottom wall. In addition or instead of this, it can be provided that the thickness of the side walls is different from the thickness of the rear wall and/or different from the thickness of the ceiling wall. In particular, the thickness of the side walls is less than the thickness of the top wall and/or less than the thickness of the bottom wall.
  • the muffle has a front flange as a further separate module component.
  • This is formed as a preferably continuous frame which, when the muffle is in the assembled state, bears against the top wall and/or the bottom wall and/or the side walls at the front.
  • this initially prefabricated front flange can be provided and then subsequently connected to other walls of the muffle by a mechanical connection, in particular a non-detachable connection such as a welded connection.
  • This front flange preferably has a thickness of between 1.1 mm and 1.4 mm, in particular between 1.2 mm and 1.3 mm.
  • the front flange is designed with a greater thickness than the thickness of the top wall and/or the thickness of the bottom wall.
  • an additional material is applied to an outside of the base material, in particular metal, for example steel, of the muffle and/or to an inside of the base material of the muffle.
  • This material can be enamel, for example.
  • This enamel can be applied as a coating.
  • the thickness of the enamel material on the inside is between 0.10 mm and 0.20 mm, in particular between 0.13 mm and 0.17 mm.
  • the thickness of the enamel material on an outside of the muffle is between 0.050 mm and 0.100 mm, in particular between 0.060 mm and 0.080 mm. It is precisely these values of the enamel coating that make it possible on the one hand to improve the heat resistance of the muffle, in particular of the base material, which is in particular steel. These layer thicknesses also make it possible to further improve the rigidity of the muffle and thus increase the deformation stability. In particular when the appropriate heat acts on the muffle.
  • the bottom wall has the same shape and/or size and/or the same material as the top wall.
  • these side walls can be formed with the rear wall as a one-piece U-module, with this U-module then being directly connected to the separate top wall and the separate bottom wall by non-detachable connections.
  • the side walls can be provided that the side walls have additional embossing. This increases the inherent rigidity of these side walls themselves. The same can also be provided for the rear wall in addition to or instead of this.
  • the non-detachable connections are preferably formed as welded connections, in particular pinch-seam welded connections. These are particularly stable and durable, especially when exposed to strong heat and high mechanical stresses.
  • the cooking appliance has a housing.
  • the housing can be referred to as the outer housing.
  • the cooking appliance also has a muffle.
  • the muffle is a separate component from the housing.
  • the muffle is arranged in the housing.
  • the muffle delimits a cooking space of the cooking appliance with walls. In particular, it directly delimits this cooking chamber with walls.
  • the cooking appliance has at least one first heating element, in particular a strand-like or rod-like one, and in particular a first heating element which is flat and multiply bent in a single main extension area.
  • the heating element is arranged outside the muffle in a space between the housing and the muffle.
  • the first heating element is arranged as a top heat heating element, in particular as a top heat and/or grill heating element, in an upper space region of the space.
  • This intermediate space area is formed between an upper wall of the muffle viewed in the height direction of the cooking appliance and an upper outer wall of the housing which is spaced apart therefrom and is arranged at least essentially parallel thereto.
  • the cooking appliance has at least one second heating element, in particular a strand-like or rod-like one, which in particular extends in a single main extension area and is bent several times.
  • the second heating element is arranged outside the muffle in a space between the housing and the muffle.
  • the second heating element is arranged as a bottom heating element, in particular as a bottom heating and/or grill heating element, in a lower intermediate space region of the intermediate space viewed in the vertical direction, the intermediate space region being between a lower wall of the muffle and a spaced and at least substantially parallel thereto is arranged lower outer wall of the housing.
  • the first heating element i.e. the upper heating element and/or grill heating element
  • the second heating element i.e. the lower heating element and/or grill heating element
  • a cooking appliance is thus provided which is adapted with regard to a bottom heating element and/or grill heating element and a top heating element and/or grill heating element or these heating elements which are specific in terms of location and function are adapted to one another. This allows heating functions to be improved.
  • the heating elements can also be operated more appropriately as a result.
  • the bottom heat and/or grill heating element or the bottom heat and/or grill heating element can also be used for functions for which it is not suitable in conventional devices. In particular when modes of operation, in particular with specific heat outputs, are also made possible with the bottom heat and/or grill heating element that were previously not possible.
  • the cooking appliance has an operating device. This is designed such that, at least in one operating mode of the cooking appliance in which the upper heating element, preferably the upper and/or grill heating element, and the lower heating element, preferably the lower heat and/or grill heating element, are activated simultaneously, the Actual heat output of one of the two heating elements can be adjusted differently from the actual heat output of the other heating element. This also makes it possible with the cooking appliance to set different heat outputs of the individually activated heating elements via the operating device. This allows more individual preparation processes to be achieved. If, for example, the bottom heating element requires less actual heat output than the top heating element, this can be set using the operating device.
  • the actual heating powers selected or set via the operating device may be evaluated by a control unit of the cooking appliance and for the heating elements to be activated accordingly by means of this control unit.
  • the control unit of the cooking appliance and for the heating elements to be activated accordingly by means of this control unit.
  • the two heating elements have the same maximum heating power. This aspect of the invention not only makes it possible to set an actual heating output that deviates from the maximum heating output, at least for one heating element.
  • At least one of the actual heat outputs of these at least two heating elements of the cooking appliance can be set as a percentage of the maximum heat output of this heating element. In one embodiment, this can also be done via the operating device. In this context, it is also possible for the actual heating power of these at least two heating elements to be adjustable in a percentage ratio to one another using the operating device. Both a continuous adjustment and an adjustment in discrete steps can take place here. In this context, it is also possible for discrete stages to be specified, which can then be selected. These specific stages can each be percentages of a maximum heating output. In another exemplary embodiment, it can also be provided that at least one of the two heating elements has two separate partial heating elements. These can be operated independently of each other.
  • an individual actual heat output of the respective heating element can also be selected and set by selecting one of these partial heating elements.
  • at least three different actual heat outputs of the heating element can be set. This can be done on the one hand by the heat output of a first Heating part elements, on the other hand, by the heat output of the at least second further heating part elements of this heating element, if only one of the two heating elements is activated.
  • both partial heating elements of this heating element which has at least these two partial heating elements, can also be operated together. Then a third heating power of the heating element is given. This is then in particular the maximum heat output of the heating element.
  • top”, bottom”, “front”, “back”, “horizontal”, “vertical”, “depth direction”, “width direction”, “height direction” etc. are the positions specified for the intended use and intended arrangement of the device and directions given.
  • FIG. 1 shows a perspective representation of an exemplary embodiment of a cooking appliance according to the invention
  • FIG. 2 shows a perspective representation of an exemplary embodiment of a heating element according to the invention with an exemplary embodiment of a spacing unit according to the invention
  • FIG. 3 shows a perspective illustration of a further exemplary embodiment of a heating element according to the invention with an exemplary embodiment of a spacing unit according to the invention
  • FIG. 4 shows a side view of the arrangement according to FIG. 3;
  • FIG. 5 shows a plan view of the arrangement according to FIG. 3;
  • FIG. 6 shows a perspective representation of a partial area of an exemplary embodiment of a cooking appliance with specific components
  • FIG. 7 shows a plan view of the arrangement according to FIG. 6;
  • FIG. 8 shows a perspective illustration of a further exemplary embodiment of a heating element according to the invention with an exemplary embodiment of a spacing unit according to the invention
  • FIG. 9 shows a schematic representation of an exemplary embodiment of a muffle of a cooking appliance according to the invention.
  • Fig. 10 is a schematic sectional view of sub-components of a
  • 11 shows a side view of a partial area of an exemplary embodiment of a cooking appliance according to the invention
  • 12 shows a partial illustration of partial heating elements of a heating element with a temperature sensor of an exemplary embodiment of a cooking appliance according to the invention
  • FIG. 13 shows an exploded view of an embodiment of a muffle according to the invention of an embodiment of a cooking appliance according to the invention.
  • FIG. 14 shows the muffle according to FIG. 13 in the assembled state.
  • Fig. 1 an embodiment of a cooking appliance 1 is shown in a perspective view.
  • the cooking appliance 1 can be an oven.
  • the cooking appliance 1 can be a microwave cooking appliance or a steam cooking appliance. It is also possible for the cooking appliance to be an oven with a microwave function and/or a steam cooking function.
  • the cooking appliance 1 has a first housing 2 . This can also be referred to as the outer housing.
  • the housing 2 has a top wall 3 , a bottom wall 4 , a rear wall 5 and side walls 6 and 7 .
  • the cooking appliance 1 has a muffle 8 .
  • the muffle 8 is a component of the cooking appliance 1 that is separate from the housing 2 .
  • the muffle 8 is accommodated in the housing 2 .
  • the muffle 8 is made of metal. It can be made of steel.
  • the muffle 8 has a top wall 9, a bottom wall 10, a rear wall 11 and opposite side walls 12 and 13.
  • a cooking space 14 of the cooking appliance 1 is delimited by the muffle 8 . In particular, the cooking space 14 is directly delimited at least in regions by the walls of the muffle 8 .
  • the cooking appliance 1 has a door 15 .
  • This is movably arranged on the housing 2 and/or the muffle 8 . You can be pivoted about a vertical axis A here.
  • the door 15 is arranged to close the cooking chamber 14 at the front.
  • An intermediate space 16 is formed between the muffle 8 and the housing 2 .
  • the intermediate space 16 has an upper intermediate space region 17 in the height direction (y-direction) of the cooking appliance 1 .
  • the intermediate space 16 has a lower intermediate space region 18 when viewed in this vertical direction.
  • the upper Space area 17 extends in the vertical direction between the top wall 9 of the muffle 8 and the top wall 3 of the housing 2.
  • the lower space area 18 extends between the bottom wall 10 of the muffle 8 and the bottom wall 4 of the housing 2.
  • the cooking appliance 1 has a heating element 19 on. In the exemplary embodiment shown, the heating element 19 is arranged outside of the cooking chamber 14 . It is here in the intermediate space 16, in particular the upper intermediate space area 17, is arranged.
  • the heating element 19 is a resistance heating element here. As indicated in FIG. 1, it is formed in the form of a strand or rod. This strand or this rod is bent several times or twisted several times.
  • the heating element 19 is a top heat heating element or a grill heating element. In particular, it is the top heat and/or grill heating element.
  • the cooking appliance 1 has an additional heating element 20 .
  • This heating element 20 is arranged outside of the cooking space 14 . In particular, it is arranged in the intermediate space, preferably in the lower intermediate space area 18 .
  • This heating element 20 is in particular a bottom heating element. It can also be a bottom heat and/or grill heating element of the cooking appliance 1.
  • the heating element 19 is arranged at a distance from the ceiling wall 9 in the intermediate space area 17 . In particular, it is also arranged at a distance from the top wall 3 of the housing 2 .
  • the heating element 19 is formed with its main extension in a main extension area. This is spanned in particular by the width direction (x-direction) and the depth direction (z-direction) of the cooking appliance 1 .
  • the main extension surface can be flat or curved. The strand shape with the curved shape of the heating element 19 is thus as it were laid in this horizontal main extension area.
  • the heating element 19 is arranged at a distance from the wall 9 , in particular from an outside 9a of the wall 9 facing away from the cooking chamber 14 , by a spacing unit 21 (as shown in FIG. 2 ) of the cooking appliance 1 .
  • this spacing unit 21 has a plurality of spacing rods 22 , 23 , 24 , 25 , 26 , 27 , 28 and 29 .
  • the number and arrangement of these distancing rods 22 to 29 should only be understood as examples.
  • These distancing rods 22 to 29 are oriented at least in sections so as to protrude from that main extension surface which is spanned by the main dimensions of the heating element 19 in terms of size. In the exemplary embodiment shown, these distancing rods 22 to 29 thus protrude downwards from this main extension area, in which the main extension or the main size of the heating element 19 is formed.
  • the heating element 19 is arranged sitting on the muffle 8 from above. This means that this distancing unit 21 is seated directly on the muffle 8 .
  • the distancing rods 22 to 29 can therefore be seated directly on the muffle 8 with their cross-sectional areas.
  • At least one distancing rod has a bend at one end that faces away from the heating element 19 .
  • it is provided in the distancing rod 22 that it has a bend 22a at the end. This connects to the side facing away from the heating element 19 or the end facing away from a further rod part 22b.
  • this bend 22a is a seated coupling part, with which the distancing unit 21 is seated on a side of a counter-coupling element of the cooking appliance 1 facing the heating element 19 for distance-adjusting coupling, in particular directly.
  • this bend 22a is arranged at an angle of 85° and 95°, in particular 90°, with respect to the further rod part 22b directly adjoining it.
  • at least one further distancing rod is formed on this side of the distancing unit 21 , here the distancing rod 25 , with a bend 25a and a rod part 25b corresponding to the distancing rod 22 .
  • the distancing rod 26 which here also has a bend 26a and a rod part 26b.
  • the distancing rod 29 also has a bend 29a and a rod part 29b adjoining it.
  • the bends 22a, 25a, 26a and 29a extend in the horizontal direction, in particular with their longitudinal axes in the width direction. In one exemplary embodiment, they are arranged in the essentially four corner areas of the heating element 19 .
  • the distancing rod 23 also has a bend 23a at the end. This closes on the heating element 19 Averted side or the opposite end of another rod part 23b of the distancing rod 23 at. As can be seen here, this bend 23a extends with its longitudinal axis in the depth direction (z-direction). In addition, it is provided that, viewed in the vertical direction (y-direction), the bend 23a is lower and thus further away from the heating element 19 than the bend 22a of the distancing rod 22. This height offset of the bend 23a is also in comparison in one embodiment to the bends 25a, 26a and 29a.
  • the distancing bar 24 is designed to correspond to the distancing bar 23 .
  • a bend 24a and a rod part 24b are also provided there.
  • this is also provided for the distancing rod 28 .
  • this is also formed with a bend 28a and an adjoining rod part 28b.
  • the same is also formed by the bend 27a and the rod part 27b of the distancing rod 27 .
  • the bends 23a, 24a, 27a and 28a are arranged at the same or substantially the same height. As can also be seen, these bends 23a and 24a extend with their longitudinal axes when viewed in the depth direction. In particular, they face each other.
  • this also applies to bends 27a and 28a.
  • these bends 23a, 24a, 27a and 28a each form a rear-engagement coupling part, with which the distancing unit 21 engages behind on a side of a counter-coupling element of the cooking appliance 1 facing away from the heating element 19 for distance-adjusting coupling, in particular directly.
  • the cooking appliance 1 has position securing elements. These position securing elements are formed here by position securing rods 30, 31, 32 and 39. The number is only to be understood as an example here.
  • a position securing rod 39 which is in particular rectilinear, is arranged directly on an underside of the heating element 19 .
  • a fixed connection between a position securing rod 30 to 32, 39 and the heating element 19 is formed here. It can a preferably non-detachable connection can be provided here. For example, a welded connection can be implemented.
  • a position securing rod 30, 31 and 39 extends over the entire width of a heating element 19.
  • the further position securing element or the further position securing rod 32 is not formed over the entire width, but instead extends on opposite sides of a central axis M each with corresponding position securing rod sections.
  • this position assurance bar 32 may also be a single continuous bar, as shown in FIG. In this regard, this position securing rod 32 is not completely straight, but angled. This also secures the position of electrical, in particular rod-shaped, connecting pieces 33, 34, 35 and 36. A section of the position securing rod 32 is arranged directly on the underside of these connection pieces 33 to 36 .
  • a distancing rod is arranged on at least one position securing rod 39, in particular on opposite ends.
  • the distancing rods are formed in one piece with a position securing rod.
  • the distancing rods 22 and 26 are formed directly on opposite ends of the position securing rod 39 . This results in a U-shaped support and positioning rod.
  • the distancing rods 23, 24, 25, 27, 28 and 29, which are arranged at an angle to the position securing rods 30 to 32, are formed on opposite ends. This also forms a rod frame on which the heating element 19 is seated.
  • the heating element 19 has at least two partial heating elements 37 and 38 .
  • the two heating parts 27 and 38 are separate and independent of each other.
  • the first partial heating element 37 which is in the form of a strand or rod and bent several times, has two electrical connection pieces 33 and 36 .
  • the second partial heating element 38 which is also designed in the form of a strand or rod and bent several times, has its own electrical Connectors 34 and 35 on.
  • both partial heating elements 37 and 38 extend with their curved shape in a main extension area. This can be a horizontal surface. In one exemplary embodiment, they both extend in the same main extension area, which is spanned by the width direction and the depth direction of the cooking appliance 1 .
  • one partial heating element is surrounded by the other partial heating element. It is provided here that the first partial heating element 37 , viewed in this plane of projection, surrounds the second partial heating element 38 on the peripheral side. The windings of one partial heating element 37 surround the windings of the other partial heating element 38 at a distance. The second partial heating element 38 is surrounded by the first partial heating element in the manner of a frame in this main extension area.
  • the second partial heating element 38 has an asymmetrical H-shape when viewed in this plane of projection.
  • a smaller H-leg 38a, a larger H-leg 38b and a connecting leg 38c are formed by strand sections of the entire strand shape of this second partial heating element 38.
  • the first H-leg 38a is shorter but wider than the other H-leg 38b.
  • the first partial heating element 37 has U-shaped strand sections 37a and 37b. In this respect, they are arranged symmetrically to one another in relation to the central axis M. Viewed in the depth direction, these U-shaped strand sections 37a and 37a are arranged in particular so that they overlap with the short H-leg 38a and the connecting leg 38c. An overlapping arrangement with the longer H-leg 38b in this depth direction is not provided here in particular. However, an overlapping arrangement is formed between this H-leg 38b and these U-shaped strand sections 37a and 37b, particularly in this connection in the width direction x-direction.
  • these U-shaped strand sections 37a and 37b in particular do not overlap with the shorter H-leg 38a and the connecting leg 38c.
  • these U-shaped strand sections 37a and 37b are in particular the components or strand sections of the first partial heating element 37 closest to the shorter H-leg 38a and the connecting leg 38c.
  • a further exemplary embodiment provides that, viewed in the width direction (x-direction), these U-shaped line sections 37a and 37b are adjoined to the outside by further line sections 37c and 37d, in particular running parallel thereto.
  • each of these strand sections forms a double U shape.
  • a multiply bent connection structure 37e of the first partial heating element can be formed, for example in one exemplary embodiment.
  • This can in turn, as shown in FIG. 2, be a multiple U-shape oriented in the depth direction, in particular having at least two, preferably three U-shaped strand regions directly adjoining one another.
  • these can be five U-shaped areas oriented alternately to one another, as is realized in FIG. 2 .
  • the first partial heating element 37 can be formed differently in the connection area of the mutually facing U-shaped strand sections 37a and 37b, as in FIG.
  • a rectilinear strand 37f of the first partial heating element 37 is formed on the front side and delimiting the shape of the strand. This then merges into curved U-shaped areas.
  • a respective L-shaped strand section is created instead of the U-shaped strand sections 37a and 37b, the U-shape of which is open on the side facing away from the electrical connection pieces 33 to 36.
  • An L-shaped strand section 37g and 37h is formed here in each case. In this regard, a quasi hollow L is formed in each case.
  • there the bends 23a and 24a are connected directly to one another and thus a one-piece rod is realized as a bend.
  • FIG. 4 shows a side view of the arrangement according to FIG.
  • the already explained height offset between the bends 26a and 23a and the bends 22a and 23a visible in FIG. 4 can be seen in the vertical direction (y-direction).
  • this height offset is such that a lower edge of the higher-lying bends 26a, in particular with a Distance, is higher than a top edge of the bend 28a.
  • a gap is formed between an underside of the higher-lying bend 26a and an upper side of the lower-lying bend 28a.
  • This is in particular dimensioned such that a counter-coupling element of the cooking appliance 1 can be arranged in between.
  • a corresponding height offset is realized in particular in the case of the other pairs of bends present here, as can be seen in FIG. 4 and in particular also in FIG. 2 .
  • a spacer rod 22 to 29 extends in the vertical direction over a height which is many times greater than the diameter of a strand of heating element 19.
  • a height of the spacer rods 21 to 29 in such a way that in the installed state of this arrangement according to FIG.
  • a vertical distance between the outside 9a and the underside of the heating element 19 is preferably between 0.8 times and 0.5 times the thickness of a strand of the heating element 19 and/or the heating element 19 is separated by the spacing unit 21 in a distance to the outside 9a of the adjacent wall, here the top wall 9, measured in the height direction, which is between 0.3 mm and 0.7 mm, in particular between 0.3 mm and 0.4 mm.
  • FIG. 5 shows a top view of the arrangement according to FIGS. 3 and 4 .
  • Values for distances and dimensions between individual strand sections of the heating element 19 and/or distancing elements and/or position securing elements are also drawn in here by way of example.
  • the heating element 19 has a strand diameter of between 6 mm and 7 mm, in particular between 6 mm and 6.5 mm.
  • the position securing rod 28 which is furthest away from the electrical connection pieces 33 to 36 is also not straight but angled.
  • the position securing rod 39 at the front, viewed in the depth direction, and the electrical connection part rods 33 to 36 extend in this exemplary embodiment
  • the nearest rear position securing rod 32 is further outwards in the width direction than the position securing rods 30 and 31 that are further in the middle here in the example.
  • the rod parts 26b, 29b, 22b and 25b are arranged offset further outwards in the width direction than the further rod parts 23b, 24b , 27b and 28b.
  • the hollow L-strand sections 37h and 37g can also be seen here. They are outlined with dashed lines.
  • FIG. 6 a perspective partial view of the muffle 8 with the arrangement according to FIG. 2 is shown in an exemplary embodiment.
  • the housing 2 is removed here.
  • a counter-coupling element 40 is formed on an outer side 8a of the muffle 8 .
  • This counter-coupling element 40 is a flange protruding from the outside 8a. Viewed in the vertical direction, it is offset downwards relative to the top wall 9 .
  • it can be arranged on an outside of the side walls 12 and 13 of the muffle 8 . In this regard, it projects to the side in the width direction.
  • the flange can also be integrally formed on a top wall 9 formed in the shape of a trough.
  • this counter-coupling element 40 extends as a continuous web or strip. It extends over essentially the entire depth of the side wall 12 or 13. It can be provided that this counter-coupling element 40 is also arranged on the outside of the rear wall 11 of the muffle 8 and in this respect protrudes backwards. As can be seen here, the distancing unit 21 with the bends 22a , 25a , 26a , 29a lying higher in the height direction is seated on a top side 40a or a side of the counter-coupling element 40 facing the heating element 19 .
  • the bends 23a, 24a, 27a and 28a are in contact with an underside 40b or a side of the counter-coupling element 40 facing away from the heating element 19 .
  • These multiple bends 22a to 29a thus encompass this counter-coupling element 40 on both sides.
  • the counter-coupling element 40 is thus arranged in one exemplary embodiment between the bends 22a to 29b, in particular arranged clamped therein.
  • the counter-coupling element 40 in one exemplary embodiment, has in particular continuous, in particular open at the edges, Recesses 40c and 40d (Fig. 6) on.
  • the rod parts 23b and 24b are passed through these from above, so that the bends 23a and 24a are arranged below the counter-coupling element 40 .
  • the rod parts 23b and 24b can be accommodated in a precisely positioned manner through these recesses 40c and 40d, which are open at the edges. As a result, the secure position of the distancing unit 21 on the muffle, in particular on the counter-coupling element 40, is improved.
  • a muffle front flange 41 is also shown in FIG. This covers the intermediate space 16 at the front.
  • the strand sections of the strand shape or rod shape shown in this exemplary embodiment, which is bent or twisted several times, of the heating element 19, in particular the partial heating elements 37 and 38, can also be seen here.
  • FIG. 7 shows a top view of the representation in FIG.
  • the other recesses 40e and 40f of the counter-coupling element 40 which are open at the edges, can also be seen here, through which the rod parts 27b and 28b of the distancing rods 27 and 28 are passed here.
  • the heating element 19 is formed from at least two partial heating elements 37 and 38, these two partial heating elements 37 and 38 extend with their larger dimensions and thus with their main area in a common main extension area.
  • the heating element 19 is arranged within the area dimensions of the ceiling wall 9 when viewed in projection. This applies to the entire strand sections of the heating element 19 except for the electrical connection pieces 33 to 36.
  • the heating element 19 is therefore only located in an intermediate space region 17 which is delimited by the adjacent walls of the muffle 8 and the housing 2, which walls are in particular arranged parallel to one another. Here this is formed by the ceiling wall 9 and the ceiling wall 3 in the example.
  • a heating element 19 has at least two such separate heating elements 37 and 38, which are in particular wound into one another, then in one exemplary embodiment at least one heating element is designed with a maximum heating output of greater than or equal to 2 kW. In addition to or instead of this, it can also be provided that the at least two partial heating elements 37 and 38 have a total maximum heating output of greater than or equal to 3 kW in a common operating mode.
  • a maximum heating output of one of the two partial heating elements 37, 38 is less than the maximum heating output of the other partial heating element 37, 38.
  • the maximum heating output of the one partial heating element with the greater maximum heating output is at least 50%, in particular at least 60%. , In particular at least a maximum of 90%, greater than the maximum heating output of the other partial heating element 37, 38, which has the lower maximum heating output.
  • the maximum heat output of the partial heating element 37, 38 with the smaller maximum heat output is between 1.0 kW and 1.5 kW, in particular between 1.1 kW and 1.3 kW, in particular 1.2 kW.
  • the maximum heat output of the partial heating element with the greater maximum heat output is between 2.0 kW and 2.5 kW, in particular between 2.1 kW and 2.3 kW.
  • the maximum total heating output of the heating element 19 is between 3.0 kW and 4.0 kW, in particular between 3.2 kW and 3.6 kW, in particular between 3.3 kW and 3.5 kW.
  • the sub-heating element that has the greater maximum heating output is the outer sub-heating element viewed in the projection plane, here in the exemplary embodiment the first sub-heating element 37.
  • the heating element 19 is designed with a surface density which, viewed in the plane of projection, is greater at the edge than in the middle.
  • the maximum operating temperature of the heating element 19 is greater than 650°C, in particular greater than 700°C, in particular between 700°C and 800°C.
  • the cooking appliance 1 has a temperature sensor 42, as is shown in FIG.
  • the temperature sensor 42 is arranged outside of the cooking space 14 .
  • the temperature sensor 42 is designed to detect the temperature of the heating element 19 and/or the wall adjacent to the heating element 19 , here the top wall 9 , of the muffle 8 .
  • the temperature sensor 42 is arranged in the gap region 17 and arranged adjacent to and between the two heating sub-elements 37 and 38 .
  • the temperature sensor 42 is arranged at the hottest point during operation. This relates in particular to the hottest point between the partial heating elements 37 and 38.
  • the temperature sensor 42 can be arranged directly on the outside 9a. He can directly record the temperature of this wall, here the ceiling wall 9 .
  • the temperature sensor 42 is arranged between the heating sub-elements 37 and 38, as shown in FIG. In particular, it is here preferably arranged at the same or essentially the same, in particular the shortest, distance from the adjacent partial heating elements 37 and 38 when viewed in this projection view.
  • the temperature sensor 42 can be a PT sensor, in particular a PT500 or a PT1000.
  • the temperature sensor 42 is not arranged at the hottest point of the muffle 8, which is heated by the heating element 19 adjacent to the top wall 9 here, provision is preferably made for a temperature offset value to be generated. It can then be provided that the maximum temperature value that the temperature sensor 42 may have or detect in order to avoid damage to the wall of the muffle is smaller than the value that can occur at the hottest point of this wall of the muffle. For example, it can be provided that a maximum permitted, occurring temperature of 500 ° C can occur at the hottest point of the wall adjacent to the heating element 19. If the temperature sensor 42 is then not arranged at this hottest point of the top wall 9, a corresponding temperature offset value must be defined. This can be 20°C lower, for example. However, this is only an example, since such an offset value depends on where the temperature sensor 42 is arranged and what lower temperature can then occur in comparison to the hottest point of the top wall 9 when the heating element 9 is in operation.
  • temperature sensors 42 are provided, which are arranged in the intermediate space area, here the intermediate space area 17 . They are preferably all arranged between the two partial heating elements 37 and 38 , in particular viewed in the projection plane, essentially at the same distance from the closest regions of one partial heating element 37 and the other partial heating element 38 .
  • the cooking appliance 1 can have a first operating mode in which only one of the two partial heating elements, for example the first partial heating element 37, is activated.
  • the second heating sub-element 38 is then deactivated.
  • only the second heating part element 38 can be activated.
  • the first partial heating element 37 is then deactivated.
  • both heating sub-elements 37 and 38 can be activated at the same time. It is also possible for each of these operating modes to have an individual maximum temperature threshold value defined for the wall at the hottest point, which must not be exceeded. The respective actual temperature is then measured with the at least one temperature sensor 42 .
  • the partial heating elements 37 and 38 have different maximum heating powers in one exemplary embodiment, it is advantageous to also define different maximum temperature threshold values in the respective operating modes, which in particular must not be exceeded. Are both heating elements 37 and 38 activated and thus the third operating mode is active, the highest temperature threshold value can be specified in this regard. If only the partial heating element with the lower maximum heating power compared to the other partial heating element is activated, a temperature threshold value that is lowest in this regard can be specified. In the other operating mode, in which the partial heating element is only activated alone with the maximum heating power that is greater than the other partial heating element, an average temperature threshold value can be defined or specified in this regard.
  • a cooking appliance 1 can be implemented in which the heating element 19 is configured identically in at least one electrical heating element parameter and/or in at least one geometric heating element parameter.
  • An electrical heating element parameter can be, for example, a maximum heating power of the entire heating element. This means that the heating element 19 can have the same maximum heating power as the heating element 20 . It is also possible, if both heating elements 19, 20 each have the same number of different separate partial heating elements 37 and 38, that at least two partial heating elements of the heating elements 20 and 19 have the same maximum heating power. It is also possible that a partial heating element of a partial heating element 19, 20 has the same maximum heating power as another partial heating element of the other heating element 19, 20. In a further exemplary embodiment, a further partial heating element of a heating element 19, 20 can also have the same maximum heating output as the further other partial heating element of the other heating element 19, 20.
  • a heater element geometric parameter may be a strand length of a heater element, for example.
  • a further geometric heating element parameter can be, for example, a strand length of at least one partial heating element of a plurality of partial heating elements of a heating element.
  • a further geometric heating element parameter can be, for example, the shape of a strand of a heating element and/or the size of the heating element in one plane.
  • a heating element 18 embodied as a bottom heating element can also have maximum heat outputs in one exemplary embodiment, as was explained above in the exemplary embodiments for the heating element 19 embodied in particular as a top heating element and/or grill heating element.
  • a further exemplary embodiment of a heating element 19 is shown in a perspective representation in FIG. 8 .
  • FIG. 8 also shows an alternative exemplary embodiment for the distancing unit 21. This is not connected in one piece to position securing rods 39, 30, 31 and 32 here. Rather, here the distancing rods 22, 25, 26 and 29 are separate rods. In one exemplary embodiment, these are formed by hanging bends, of which only one enclosing hanging 26c is shown in FIG. 8 for the sake of clarity. Otherwise, the explanations that have already been presented for other exemplary embodiments also apply to this exemplary embodiment.
  • FIG. 9 shows an exemplary embodiment of a muffle of a cooking appliance 1 in a simplified front view.
  • a thickness d2 of side walls 12, 13 of the muffle 8 is different from a thickness d1 of the top wall 9 and/or a thickness d3 of the bottom wall 10.
  • the thickness d2 of the side walls 12 and 13 can also be different be the thickness of the rear wall 11.
  • the thickness d2 is smaller than the thickness d3 of the bottom wall 10 and/or smaller than the thickness d1 of the top wall 9.
  • the thickness d2 is a value between 0.2 mm and 0.5 mm, in particular between 0.25 mm and 0.35 mm smaller than the thickness d3 of the bottom wall 10 and/or correspondingly smaller than the thickness d1 of the Top wall 9.
  • the thickness d2 is between 0.4 mm and 0.8 mm, in particular between 0.4 mm and 0.6 mm.
  • the thickness d3 of the bottom wall 10 is between 0.6 mm and 1.0 mm, in particular between 0.7 mm and 0.9 mm.
  • the thickness d1 of the top wall 9 is between 0.6 mm and 1.0 mm, in particular between 0.7 mm and 0.9 mm.
  • the muffle 8 is in particular made of metal, in particular steel.
  • a base material, in particular steel, of the muffle 8 is provided at least in regions on an outer side 8a facing away from the cooking chamber 14 with an additional material that has a heat resistance of up to 550° C., in particular up to 530° C having.
  • This material can be applied to the outside 8a of the muffle 8 as a coating.
  • This material can, for example, have enamel with a heat resistance of up to 550°C, in particular up to 530°C.
  • such an additional material can also be applied to an inner side 8b of the muffle 8, at least in certain areas.
  • an additional material can be applied at least in regions on the outside of the muffle 8 .
  • This additional material can be a coating 45, for example.
  • This coating 45 can have enamel. In particular, it can be entirely enamel.
  • this coating 45 has a thickness of between 0.050 mm and 0.100 mm, in particular between 0.060 mm and 0.080 mm, in particular 0.070 mm, on the outside 8a of the muffle 8 .
  • a further coating 46 can be applied to an inner side 8b of the muffle 8 at least in certain areas. It is also applied here as additional material.
  • the base material can be metal, in particular steel.
  • this coating 46 is formed with a layer thickness of between 0.100 mm and 0.200 mm, in particular between 0.140 mm and 0.160 mm, in particular 0.150 mm.
  • FIG. 10 shows a partial area of an exemplary embodiment of a cooking appliance 1 in a simplified vertical sectional view.
  • At least one thermal shielding unit 43 of the cooking appliance 1 is arranged in the intermediate space 16 , in particular the intermediate space region 17 .
  • the thermal shielding unit 43 is designed in the manner of a plate.
  • the material of the thermal shielding unit 43 has a temperature value as a melting point that is higher than the maximum operating temperature of the heating element 19 , which is also arranged in this partial space region 17 .
  • the thermal shielding unit 43 rock wool.
  • the thermal shielding unit 43 is a mat of fiber material.
  • this thermal shielding unit has a thickness a of between 12 mm and 18 mm, in particular between 14 mm and 16 mm.
  • the thermal shielding unit 43 is in direct contact with the heating element, here the heating element 19. In one embodiment, the thermal shielding unit 43 is only arranged on that side of the heating element 19 in the intermediate space region 17 that faces away from the top wall 9. In the exemplary embodiment, the heating element 19 is completely exposed towards the ceiling wall 9 . In another exemplary embodiment, the thermal shielding unit 43 can also have or be a metal plate or a metal grid.
  • the cooking appliance 1 has a thermal insulation unit 44 that is separate from the thermal shielding unit 43 . This is arranged in the space 16 , in particular in the partial space area 17 .
  • the thermal insulation unit is a mat of fiber material. In particular, it can have glass wool or be made of glass wool.
  • this thermal insulation unit 44 has a thickness b. The thickness b is in particular greater than the thickness a. The thickness b can be between 20 mm and 30 mm, in particular between 24 mm and 26 mm.
  • the material of the thermal insulation unit 44 is formed with a temperature value as a melting point that is lower than the maximum operating temperature of the heating element 19.
  • the thermal insulation unit 44 is arranged only between the heating element 19 and the top wall 3 of the housing 2. This thermal insulation unit 44 is not arranged between the heating element 19 and the top wall 9 of the muffle 8 . In particular, the thermal insulation unit 44 is arranged between the thermal shielding unit 43 and the top wall 3 of the housing 2 .
  • a thermal insulation unit 44 in particular a glass wool, can be arranged in the lower intermediate space region 18. There it can have a thickness d between 35 mm and 45 mm, in particular between 39 mm and 41 mm. This is particularly the case when no thermal shielding unit 43 is arranged in the lower intermediate space area 18 . If an additional heating element 20 is present in one embodiment, in particular as a bottom heating element and/or grill element, the corresponding arrangement with a thermal shielding unit 43 and/or a thermal insulation unit 44, as explained in FIG. 9, can also be used in the intermediate space area 18 can be arranged. The thermal insulation unit 44 that is preferably present is then located here between the thermal shielding unit 43 that is preferably present and the bottom wall 4 of the housing 2.
  • the top wall 9 is uneven.
  • a dome-like curvature, in particular an upwardly oriented curvature, is formed here.
  • the heating element 19 is also formed in a correspondingly curved or arched manner.
  • This curvature can be adapted to the curvature of the top wall 9 .
  • the curvature is such that viewed in the height direction, a distance c between the highest point of the curvature and the lowest point of a tub ceiling of the ceiling wall 9 shown here is between 10 mm and 15 mm, in particular between 11 mm and 13 mm, for example 12 mm.
  • a corresponding curvature can also be formed in the base wall 10 .
  • the bottom heating element that is preferably present can also be correspondingly arched in the form of the heating element 20 . However, this is then a bulging curvature viewed in the height direction.
  • FIG. 12 shows a partial area of the heating element 19 in an enlarged view.
  • a position of a temperature sensor 42 of the cooking appliance 1 is shown.
  • This is formed here, for example, tubular. It is arranged here at the same or essentially the same distances d and e from the points closest in this respect to the partial heating elements 37 and 38 of the heating element 19 that are preferably present here.
  • the shape and configuration of the heating element 19 is preferably such that the hottest point on the adjacent wall, here the top wall 9 of the muffle 8, occurs at the point shown in FIG. This can here The temperature is measured with the temperature sensor 42 at the hottest point of the top wall 9, so to speak. The hottest spot is defined by the heat profile of the heating element 19 during operation.
  • a muffle 8 of the cooking appliance 1 is shown in an exploded view.
  • the muffle 8 has a particularly modular design. This also means in particular that the muffle 8 is formed from a number of separate, prefabricated modular components which are then connected to one another in a connection process after their own production, in particular their respective final shape.
  • the muffle 8 has the top wall 9 as a prefabricated separate component.
  • the bottom wall 10 is formed as a prefabricated separate component as a modular assembly.
  • the front flange 41 that is preferably present is prefabricated and provided as a separate module component of the muffle 8 .
  • the side walls 12 and 13 and the rear wall 11 form a one-piece modular component.
  • a module component or a U-module that is U-shaped in this regard is thus provided here.
  • the top wall 9 has a trough shape.
  • the bottom wall 10 can also have a trough shape.
  • the trough shape of the top wall 9 is formed by a plate-like trough cover 47.
  • the top wall 9 has a trough collar 48 with regard to its trough shape. This is arranged on a peripheral edge of the plate-shaped tub ceiling 47, in particular formed circumferentially over at least three sides of the four-sided tub ceiling 47 here. It forms the side wall of the tub shape.
  • a flange 49 of the trough shape can also be provided.
  • This flange 49 is a flange protruding from the tub collar 48 . It is an outwardly and thus laterally cantilevered web.
  • This flange 49 is formed on an edge of the tub collar 48 that faces away from the tub ceiling 47 .
  • this flange 49 is also the counter-coupling element 40 or has this counter-coupling element 40, as has already been explained above.
  • this trough-shaped top wall 9 preferably has the thickness d1, as explained with reference to FIG.
  • the base wall 10 has a trough base 50 .
  • the bottom wall 10 has a trough collar 51 .
  • a flange 52 can also be formed. This can also correspondingly have a counter-coupling element 40 or be the counter-coupling element 40 .
  • the trough shape of the bottom wall 10 can be adapted to the trough shape of the top wall 9 .
  • the top wall 9 can also be structurally identical to the bottom wall 10 .
  • the tub ceiling 47 is provided with a dome-like curvature, as was explained with reference to FIGS. 10 and 11 .
  • this trough floor 50 can also be correspondingly curved.
  • the side walls 12 and/or 13 and/or the rear wall 11 can have embossings 53 and 54 .
  • embossings 53 and 54 individual stiffening of the walls mentioned can be achieved on their own.
  • the entire muffle 8 is also correspondingly stiffer in the assembled state.
  • the assembled state of the muffle 8 is shown in FIG.
  • the side walls 12 and 13 and the rear wall 14 dip into the respective trough shape of the two trough-shaped components here, in particular, corresponding to the top wall 9 and the bottom wall 10 .
  • This trough shape of the top wall 9 extends horizontally further outwards in the width direction and in the depth direction than is given by the position of the side walls 12 and 13 and the rear wall 11 .
  • the same can be provided with the bottom wall 10, as can be seen in FIG.
  • Such a shoring and a corresponding interlocking also increases the stability of the muffle again.
  • one embodiment therefore provides that the side walls 12 and/or 13 and/or the rear wall 11 dip at least slightly into the trough shape of the top wall 9 and/or the trough shape of the bottom wall 10 .
  • non-detachable connections 55 are formed between the individual module parts, namely the top wall 9 and the side walls 12, 13 and the rear wall 11. These inseparable connections are in particular welded connections. In addition or instead, between the side walls 12 and 13 and the Rear wall 11 and the bottom wall 10 other non-detachable connections, in particular welds 56 formed.
  • the front flange 41 can also be connected to the top wall 9, the bottom wall 10 and the side walls 12 and 13 by a non-detachable connection, in particular a welded connection 57.
  • the muffle 8 according to FIG. 13 and FIG. 14 can be formed with the thicknesses d1, d2 and d3, as explained for FIG.
  • the coating 45 and/or 46 can additionally be present in one exemplary embodiment.
  • All of the exemplary embodiments presented here can each be part of a cooking appliance when considered individually. It is also possible that several exemplary embodiments individually presented here are combined and lead to a further exemplary embodiment which is also to be regarded as disclosed.
  • the variously explained muffles 8 can be combined in a cooking appliance 1 with correspondingly differently formed heating elements.
  • the individually explained heating elements 19, 20 can be combined with different muffles to form a specific cooking appliance.
  • all exemplary embodiments presented here can also be implemented in a common exemplary embodiment of a cooking appliance.
  • a cooking appliance 1 can have an operating device 58 (FIG. 1).
  • This operating device 58 shown symbolically in FIG. 1 can also be arranged elsewhere locally. It can be arranged on the cooking appliance 1, for example the door 15, or separately from the door on an existing control panel of the cooking appliance 1, for example.
  • the operating device 58 can be installed in a stationary manner on the cooking appliance 1 .
  • the operating device 58 can be a separate component.
  • it can be a portable operating device 58 .
  • it can also be a communication terminal, such as a mobile radio terminal.
  • a system can then also be implemented which has at least one cooking appliance 1 and such a separate and, in particular, portable operating device 58 .
  • the operating device 58 is used at least in one operating mode of the cooking appliance 1 in which the heating element 19, which is in particular a top heat and/or grill heating element, and a bottom heat and/or grill heating element, which is realized for example by the heating element 20, are activated, the actual heat output of one of these two heating elements 19, 20 can be set differently to the actual heat output of the other heating element 19, 20.
  • the operating device 58 can be connected to a control unit 59 (FIG. 1) of the cooking appliance 1 that is preferably present. In this way, signals relating to the operating device 58 can be transmitted to the control unit 59 .
  • the heating element 19 and/or the heating element 18 can then be operated accordingly with the control unit 59, which can also be a control and/or regulating unit.
  • the two existing heating elements 18 and 19 can have the same maximum heating power, for example. However, they can also have different maximum heat outputs.
  • Such a possibility of setting the actual heat output of at least one heating element 18, 19 differently from a maximum heat output results in a wide range of possible combinations and settings in order to provide individual total heat outputs of both heating elements when they are both operated.
  • either the bottom heat and/or grill heating element can produce more actual heat output than the top heat and/or grill heating element, or vice versa
  • the top heat and/or grill heating element can produce more actual heat output than the bottom heat element. and/or grill heating element are provided.
  • the actual heating outputs can be adjustable as a percentage of the maximum heating output of this heating element 19 , 20 by means of the operating device 58 .
  • the actual heat output can thus be set in concrete, discrete percentage steps.
  • the actual heat outputs of the two heating elements 19, 20 can be adjustable as a percentage of one another using the operating device.
  • both discrete values for this ratio and a continuous setting are possible in the respective exemplary embodiments.
  • the operating device 58 can have corresponding operating elements and/or touch-sensitive control panels.
  • the operating device 58 can also additionally have a display unit, in particular a display. The corresponding settings can be displayed there.
  • the values and/or However, symbols of the heating elements 19, 20 may also be shown.
  • the set actual heating output and/or the ratio of the actual heating outputs and/or the percentage can then be represented in terms of value and/or symbolically.
  • operating device 58 also makes it possible, when at least one of the two heating elements 19 and/or 20 is made up of at least two separate partial heating elements 37 and 38, to also select the specific partial heating element 37 and 38 individually. A corresponding activation of the selected partial heating elements 37 and 38 then takes place.
  • This also presents a further exemplary embodiment in which individual actual heating outputs of an entire heating element 19 or 20 can be selected in such a configuration. This in the case that either the one heating part element 37 or the other heating part element 38 or both heating part elements 37 and 38 are selected.
  • control device 59 control unit

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

L'invention concerne des exemples de modes de réalisation d'appareils de cuisson (1) comportant un moufle (8) et une enveloppe (2).
PCT/EP2022/081776 2021-12-13 2022-11-14 Appareil de cuisson pourvu d'une isolation spécifique d'un élément chauffant à l'extérieur de la chambre de cuisson WO2023110251A1 (fr)

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Application Number Priority Date Filing Date Title
EP21290085 2021-12-13
EP21290085.6 2021-12-13

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WO2023110251A1 true WO2023110251A1 (fr) 2023-06-22

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459923A (en) * 1965-09-27 1969-08-05 Philco Ford Corp Apparatus for heat-cleaning ovens
GB2274915A (en) * 1993-01-11 1994-08-10 Ist Lab Ltd An electrically heated oven
US20040149722A1 (en) * 2001-01-31 2004-08-05 Bsh Bosch Und Siemens Hausgerate Gmbh Cooking device
EP1643190A2 (fr) * 2004-10-01 2006-04-05 BSH Bosch und Siemens Hausgeräte GmbH Appareil pour la cuisson d'aliments
CA2676958A1 (fr) * 2008-09-11 2010-03-11 Whirlpool Corporation Four a induction electrique
DE102010039342A1 (de) 2010-08-16 2012-02-16 BSH Bosch und Siemens Hausgeräte GmbH Heizkörper für ein Hausgerät zum Zubereiten von Lebensmitteln sowie Hausgerät zum Zubereiten von Lebensmitteln mit einem derartigen Heizkörper
DE102015225928A1 (de) 2015-12-18 2017-06-22 BSH Hausgeräte GmbH Heizkörperanordnung für ein Gargerät sowie Gargerät mit einer entsprechenden Heizkörperanordnung
US20190045590A1 (en) 2016-02-19 2019-02-07 Panasonic Intellectual Property Management Co., Ltd. Heating cooker
EP3063475B1 (fr) * 2013-10-31 2021-01-13 Electrolux Appliances Aktiebolag Four de cuisson avec une isolation

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459923A (en) * 1965-09-27 1969-08-05 Philco Ford Corp Apparatus for heat-cleaning ovens
GB2274915A (en) * 1993-01-11 1994-08-10 Ist Lab Ltd An electrically heated oven
US20040149722A1 (en) * 2001-01-31 2004-08-05 Bsh Bosch Und Siemens Hausgerate Gmbh Cooking device
EP1643190A2 (fr) * 2004-10-01 2006-04-05 BSH Bosch und Siemens Hausgeräte GmbH Appareil pour la cuisson d'aliments
CA2676958A1 (fr) * 2008-09-11 2010-03-11 Whirlpool Corporation Four a induction electrique
DE102010039342A1 (de) 2010-08-16 2012-02-16 BSH Bosch und Siemens Hausgeräte GmbH Heizkörper für ein Hausgerät zum Zubereiten von Lebensmitteln sowie Hausgerät zum Zubereiten von Lebensmitteln mit einem derartigen Heizkörper
EP3063475B1 (fr) * 2013-10-31 2021-01-13 Electrolux Appliances Aktiebolag Four de cuisson avec une isolation
DE102015225928A1 (de) 2015-12-18 2017-06-22 BSH Hausgeräte GmbH Heizkörperanordnung für ein Gargerät sowie Gargerät mit einer entsprechenden Heizkörperanordnung
US20190045590A1 (en) 2016-02-19 2019-02-07 Panasonic Intellectual Property Management Co., Ltd. Heating cooker

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