EP3811734B1 - Cooking appliance - Google Patents

Description

The invention relates to a cooking appliance device according to the preamble of claim 1 and a method for producing a cooking appliance device according to the preamble of claim 12.

Hobs are known from the prior art, which have heating units with induction coils that are attached to a substrate unit. The substrate unit is intended to hold the induction coil relative to a hob plate and to define a course of a conductor of the induction coil. Various methods are known for attaching the induction coils to the substrate unit, for example the use of clamps, screws, flaps, adhesives and plastic profiles is known. However, these known solutions are only partially suitable for operating temperatures of over 500 ° C, since using special heat-resistant materials is expensive and common fixing methods are not designed for thermal expansion of the induction coil.

From the US 2011/0155723 A1 a coil fastening device with a support element and fastening elements is known, the fastening elements being designed as clamps.

The object of the invention is, in particular, to provide a generic device with improved properties in terms of robustness and cost efficiency. The object is achieved according to the invention by the features of claims 1 and 12, while advantageous refinements and developments of the invention can be found in the subclaims.

In one aspect of the invention, it is proposed that the fastening unit fastens the conductor to the substrate unit in a movable manner relative to the substrate unit in at least one region. In this way, robustness in particular can be increased. Advantageous Changes in the course of the conductor can be balanced and/or compensated for by thermal expansion of the induction coil. In particular, deformation of the induction coil due to thermal expansion from a main plane of extension of the induction coil can be advantageously avoided. Furthermore, damage to the fastening unit due to the thermal expansion of the induction coil can advantageously be avoided.

A “cooking appliance device”, in particular an “induction oven device”, should be understood to mean at least a part, in particular a subassembly, of a cooking appliance, in particular an induction oven. In particular, the cooking appliance device, in particular the induction oven device, can also include the entire cooking appliance, in particular the entire induction oven. A “cooking appliance” is intended to mean, in particular, a household appliance which is intended to heat and/or hold a cooking utensil and/or a food item to a predefined temperature, at least for preparation and/or storage. Examples of cooking devices are ovens and/or microwaves and/or grills and/or steamers and/or hobs.

The cooking appliance preferably has at least an inner housing and an outer housing. An “inner housing” is to be understood in particular as a wall unit which delimits at least one interior space, in particular a cooking space, at least to a large extent from the outside and is itself delimited from the outside at least by the outer housing. The inner housing advantageously has a ferromagnetic metal. The induction coil is particularly advantageously intended to inductively heat at least part of the inner housing during operation of the cooking device. Preferably, the part of the inner housing comprises a top wall and/or a bottom wall of the inner housing, in particular to provide a classic heating mode known as “top and bottom heat”. The inner housing is preferably designed as a cooking muffle. A “cooking muffle” is to be understood as an inner housing which, together with an oven door of the induction oven, at least largely delimits the outside of a cooking chamber of an induction oven. An “oven door” is to be understood in particular as a wall which, in a closed state, completely covers an opening of the cooking space facing an operator, and at least partially exposes the opening in an open state. An “outer housing” of a device should be understood to mean, in particular, a wall unit which has a Outer surface of the device is at least largely defined. In this context, “at least to a large extent” should be understood to mean in particular at least 60%, advantageously at least 70%, particularly advantageously at least 80%, preferably at least 90% and particularly preferably completely.

A “heating unit” is to be understood as meaning a unit which is intended to heat and/or keep warm at least one item to be cooked and/or cooking utensils arranged in a predefined heating area. In particular, the heating unit has at least one induction coil, through which current flows, in particular during operation of the heating unit, and which generates at least one electromagnetic field for heating and/or keeping the food to be cooked and/or cooking utensils warm. The induction coil has at least one conductor, which can be produced, for example, by punching and/or sawing and/or cutting, in particular jet cutting, of a metal plate. In particular, the conductor can be designed as a single wire and/or preferably as a stranded wire. In particular, a stranded structure of a conductor designed as a stranded wire can compensate for the thermal expansion of the conductor. The conductor advantageously has at least one coating which thermally and/or electrically insulates the conductor.

A “substrate unit” is to be understood as meaning a unit which can in particular be firmly connected to the inner housing and which is intended to hold the induction coil relative to the inner housing and/or to the cooking utensils and/or food to be heated. In particular, the substrate unit is arranged between the induction coil and the inner housing. Alternatively, the induction coil could be arranged between the substrate unit and the inner housing. It would be conceivable that the cooking appliance device has a plurality of substrate units, which are arranged in particular in a stacked manner and preferably hold one turn of the induction coil between individual layers. It would be conceivable that the inner housing serves to accommodate at least the heating unit. For example, the substrate unit could be glued and/or riveted and/or screwed to the inner housing. It would be conceivable for the substrate unit to be attached directly to the inner housing, in particular to be formed in one piece with the inner housing. In this way, in particular, a distance between the induction coil and the inner housing can be minimized. “Formed in one piece” should be understood to mean, in particular, at least materially connected, for example by a welding process, an adhesive process, or a molding process and/or another process that appears sensible to the person skilled in the art, and/or is advantageously understood to be formed in one piece, such as, for example, by production from a single casting and/or by production in a single- or multi-component injection molding process and advantageously from a single blank .

In particular, the substrate unit could be attached indirectly to the inner housing. Furthermore, the heating unit could have at least one thermal insulation, via which the substrate unit is indirectly attached to the inner housing. The substrate unit preferably has at least one heat-resistant material. A “heat-resistant material” is intended to mean, in particular, a material that can withstand temperatures of at least 500°C, advantageously at least 550°C and preferably at least 600°C, without chemically changing. The substrate unit particularly advantageously has at least one electrically insulating material. An “electrically insulating material” is intended to mean, in particular, a material which has a specific electrical resistance of at least 10 ¹² (Ω mm ² )/m and, in particular, is non-conductive at least with respect to a current flowing through the induction coil during operation. It would be conceivable that the substrate unit consists at least partially of at least one heat-resistant plastic.

The substrate unit preferably consists at least partially, preferably to a large extent and particularly advantageously completely of a material which contains at least the chemical elements silicon and oxygen. The substrate unit preferably has at least one silicate. A “silicate” should be understood to mean in particular a salt and/or an ester of an ortho-silicic acid and in particular also its condensate. In particular, this should be understood to mean a mineral whose chemical composition has at least one SiO ₄ tetrahedron. Example applications for silicates are fibers and/or glasses. The substrate unit preferably has at least basalt, spar, dolomite, diabase, anorthosite, coke, glass fibers, water glass and/or mica. The substrate unit is particularly preferably designed like a mat. A “mat-like element” is to be understood in particular as an element for which there is the smallest possible imaginary cuboid that just accommodates the element, the shortest side of which is at most 30%, advantageously at most 20%, particularly advantageously at most 10%, preferably at most 5 % and particularly preferably at most 2% corresponds to a longest side of the cuboid. In particular, a mat-shaped element is stretchable, preferably foldable. In particular, the substrate unit can also be plate-shaped be trained. The substrate unit preferably has a thickness of at most 500 μm, advantageously at most 450 μm, particularly advantageously at most 400 μm, preferably at most 300 μm and particularly preferably at most 200 μm.

The fact that the fastening unit fastens the conductor to the substrate unit "in at least one area movable relative to the substrate unit" should be understood in particular to mean that the induction coil can move within the area relative to the substrate unit, in particular an edge area of the area generates a stop , which prevents further movement of the induction coil. Advantageously, a length of a permitted movement of the conductor corresponds to at least 50%, advantageously at least 70%, particularly advantageously at least 90% and preferably at least 100% of a conductor thickness of the conductor. A permitted movement of the conductor preferably corresponds to an expansion movement generated by a thermal expansion of the induction coil, preferably during operation of the induction coil. Particularly preferably, a permitted movement of the conductor corresponds to a shrinking movement generated by thermal shrinkage of the induction coil. In particular, the area can extend over the entire induction coil. The area advantageously has a further turn, in particular identical to a turn of the induction coil. For example, the induction coil can be glued, sewn, welded to the substrate unit and/or inserted into the substrate unit.

A “fastening unit” is intended to mean, in particular, a unit which is intended to attach the induction coil at least partially, in particular completely, to the substrate unit. In particular, the fastening unit is designed separately from the substrate unit and/or the conductor. The fastening unit preferably has at least one heat-resistant and/or electrically insulating material. Advantageously, the use of additional thermal insulation for the fastening unit and/or the substrate unit can be dispensed with. For example, the fastening unit could have a material that is identical to a material of the substrate unit. In particular, the fastening unit can have at least one fastening element for fastening the induction coil to the substrate unit. The fastening element can be, for example, a clip, a screw, a flap, an adhesive and/or a plastic profile.

“Provided” is intended to mean, in particular, specifically designed and/or equipped. This means that an object is intended to have a specific function In particular, it should be understood that the object fulfills and/or carries out this specific function in at least one application and/or operating state.

The fastening unit has at least one thread and the induction coil is attached to the substrate unit by means of at least one seam having the thread. The fact that the induction coil is fastened “by means of a seam containing the thread” should be understood in particular to mean that the thread penetrates the substrate unit at least once and thereby defines the area. In particular, the thread can run at a minimal distance from the conductor. The fact that the thread runs "at a minimum distance" from the conductor should be understood in particular to mean that the thread runs within a close range of the conductor, which is at most 100%, advantageously at most 80%, particularly advantageously at most 60%, preferably at most by 40% and particularly preferably at most 20% of a width of the conductor perpendicular to a longitudinal direction of the conductor. Alternatively, the thread can run at a distance from the conductor. A course of the thread advantageously corresponds to a course of the stop. In particular, the fastening unit can have further seams having further threads, by means of which the induction coil is fastened to the substrate unit. The thread preferably has at least one heat-resistant and electrically insulating material. For example, the thread could have a material that is identical to a material of the substrate unit. In particular, the thread can penetrate the substrate unit according to various standardized sewing methods, which are listed in particular in ASTM D-6193 and ISO 4915:1991. For example, the seam and/or the further seams can run according to a lockstitch method and/or a Zig Zag method. In particular, a longitudinal direction of the thread can correspond to a longitudinal direction of a nearest conductor section of the conductor. In this way, robustness can be increased in particular and simplified production of the cooking appliance device can be made possible. The induction coil can advantageously be held and electrically insulated even at high temperatures. Particularly advantageously, the induction coil can be attached to the substrate unit using common methods that can be carried out automatically.

In addition, it is proposed that the fastening unit has at least one further thread and the induction coil is fastened to the substrate unit by means of at least one further seam having the further thread. Both threads preferably have identical courses to one another. In particular, both threads could be related to each other have mirror-image courses. It would be conceivable that both threads cross each other at least in sections. Both threads advantageously define the area together. Both threads are particularly advantageously arranged on opposite sides of the conductor when viewed vertically on the substrate unit. “Opposite sides of the conductor” should be understood to mean, in particular, two partial areas which rest on a conductor section, with a first partial area, viewed from the conductor section, facing the center of the induction coil and a second partial area facing away from the middle of the coil. In this way, robustness in particular can be further increased. The stability of the area can advantageously be increased. Particularly advantageously, an expansion of the area can be chosen more flexibly.

Furthermore, it is proposed that the thread and in particular the further thread run at least in sections over the conductor and/or cross the conductor when viewed vertically on the substrate unit. A “vertical view of an object” is intended to mean, in particular, a viewing direction that runs along a straight line that intersects the object at a right angle. For a flat object, the viewing direction is perpendicular to a main extension plane of the object. A “main extension plane” of an object is to be understood in particular as a plane which is parallel to a largest side surface of the smallest imaginary cuboid, which just completely encloses the object, and in particular runs through the center of the cuboid. Advantageously, at least one contiguous side of the object is completely visible when viewed vertically. The fact that the thread "runs and/or crosses" over the conductor in sections should be understood in particular to mean that the thread runs in a section at least once from a first side of the conductor to an opposite second side of the conductor. The thread advantageously runs and/or crosses over the conductor several times, in particular at periodic intervals. In particular, the thread can run over the entire circumference of the conductor. The thread preferably runs over at most a part, in particular at most a half, of the circumference of the conductor. Particularly advantageously, the thread runs and/or crosses periodically over the conductor in the entire area. In this way, in particular, robustness can be further increased and production of the cooking appliance device can be further simplified. A movement of the induction coil perpendicular to a main extension plane of the substrate unit can advantageously be restricted without using further fastening elements. Particularly An advantageous assembly can be made possible, since the induction coil can be wound and fastened in particular in one process step.

In an advantageous embodiment, it is proposed that the thread and in particular the further thread run at least in sections, preferably always, laterally next to, in particular parallel to, the conductor when viewed vertically on the substrate unit. In particular, the thread and/or the further thread runs at a distance from the conductor which corresponds to at least 50%, advantageously at least 70%, particularly advantageously at least 80% and preferably at least 90% of the conductor thickness. In particular, the thread and/or the further thread can run between two turns of the conductor. In this way, in particular, simple production of the cooking appliance device can be achieved. The induction coil can advantageously be attached to the substrate unit in a simple manner. The area can particularly advantageously define a fixed conductor spacing of the induction coil.

In addition, it is proposed that the further thread, when viewed vertically on the substrate unit, runs at least in sections laterally next to the conductor and on a side of the conductor opposite the thread. In particular, a further distance of the further thread from the conductor is identical to the distance of the thread from the conductor. Alternatively, the distance of the further thread from the conductor could be different to the distance of the thread from the conductor. In particular, the thread and the other thread can cross each other at least in sections, preferably periodically, and change sides. Preferably, a distance of the thread from the other thread minus a thickness of the conductor corresponds to the length of the stretching movement. In this way, in particular, the holder of the induction coil can be improved. Advantageously, the induction coil can be effectively held both in a state before thermal expansion and in a state after thermal expansion.

The area advantageously has at least two partial areas opposite one another with respect to a coil center of the induction coil, in which the fastening unit attaches the conductor to the substrate unit in a movable manner relative to the substrate unit. “Two partial areas opposite one another with respect to a coil center” should be understood to mean, in particular, two partial areas of the induction coil, which, when viewed perpendicularly to the substrate unit, can be connected at least to a large extent by straight lines that intersect the middle of the coil. Both sub-areas preferably have identical dimensions. In particular, the induction coil can be attached to numerous Pairs of opposite partial regions can be attached to the substrate unit so as to be movable relative to the substrate unit. In this way, robustness in particular can be further increased. A rotation of the induction coil about an axis of rotation parallel to a main extension plane of the substrate unit can advantageously be restricted.

In particular, permitted movements of the conductor include at least one movement along a direction which is radially facing away from a coil center of the induction coil. Advantageously, a length of the movement corresponds at least to the expansion movement of the induction coil generated by the thermal expansion of the induction coil. Preferably, at least the edge region of the region, in particular the entire region, faces the center of the coil when viewed from a nearest conductor section. In this way, robustness in particular can be further increased. After operation of the induction coil, a movement of the conductor into a starting position before operation of the induction coil can advantageously be supported.

In a preferred embodiment of the invention, it is proposed that the fastening unit has at least one cover element, which is arranged at least in the area on a side of the induction coil opposite the substrate unit and restricts movement of the induction coil on this side. It would be conceivable for the fastening unit to have a large number of cover elements, which together cover the entire area. Preferably, the cover element is attached to the substrate unit by means of the seam and/or further seam having the thread and/or further thread. The fastening unit preferably has exactly one cover element, which in particular covers the entire induction coil. In particular, a main extension plane of the cover element runs parallel to a main extension plane of the induction coil. The cover element advantageously has at least one electrically insulating and/or heat-resistant material. The cover element preferably has a material that is identical to a material of the substrate unit. In particular, the cover element can be formed in one piece with the substrate unit. It would be conceivable that the cover element and the substrate unit are designed as adjacent subregions of an element of the fastening unit and are advantageously arranged by folding the element around the induction coil. In this way, in particular, the holder of the induction coil can be improved. A movement of the Induction coil can be avoided along a direction perpendicular to a main extension plane of the substrate unit.

It is also proposed that the substrate unit and the cover element touch each other at least in sections in the area and form at least one stop with regard to permitted movement of the conductor. The substrate unit and the cover element advantageously touch each other at least in the edge area, preferably in the entire edge area. The substrate unit and the cover element particularly advantageously touch each other at the seam and/or the further seam. In particular, the stop can only be released using a tool. The stop is produced, for example, by embossing, gluing, sewing and/or stapling the cover element and the substrate unit. Particularly advantageously, the substrate unit is sewn to the cover element in the area at least in sections by the thread and/or the further thread. The substrate unit and the cover element preferably touch each other along an outer edge of the induction coil. Particularly preferably, the substrate unit and the cover element together form a shell which envelops the induction coil at least to a large extent. In this way, in particular, simple production and assembly of the cooking appliance device can be achieved. The induction coil can advantageously be attached by connecting the substrate unit to the cover element. The heating unit can be designed particularly advantageously as a compact, portable unit, which is easy to transport and assemble.

Furthermore, it is proposed that the cover element is designed to be at least essentially identical to the substrate unit. The fact that the cover element is designed “at least essentially identically” to the substrate unit should be understood in particular to mean that a volume and/or a mass of the cover element is at least 60%, advantageously at least 70%, particularly advantageously at least 80% at least 90% and particularly preferably completely identical to a further volume and/or to a further mass of the substrate unit. The cover element is advantageously designed to be identical to the substrate unit in the area. It is conceivable that the cover element and the substrate unit are designed differently from one another outside the area. The cover element is preferably designed to be completely identical to the substrate unit. In this way, in particular, production of the cooking appliance device can be further simplified. The number of different components required to produce the cooking appliance device can advantageously be reduced.

The invention is further based on a method for producing a cooking appliance device, in particular an induction oven device, with at least one heating unit, which has at least one induction coil with at least one electrical conductor and at least one substrate unit, the induction coil being attached to the substrate unit and the conductor being in at least one area is movably attached to the substrate unit relative to the substrate unit.

It is proposed that the induction coil is attached to the substrate unit by means of at least one seam having a thread. In this way, in particular, robustness can be increased and production of the cooking appliance device can be simplified. The cooking appliance device should not be limited to the application and embodiment described above. In particular, in order to fulfill the functionality described herein, the cooking appliance device can have a number of individual elements, components and units that deviate from the number mentioned herein. Further advantages result from the following drawing description. Exemplary embodiments of the invention are shown in the drawings. The drawings, description and claims contain numerous features in combination.

Fig. 1

eine schematische Vorderansicht eines Gargeräts mit einer Gargerätevorrichtung,

Fig. 2

eine Explosionsdarstellung eines Teils der Gargerätevorrichtung,

Fig. 3

eine schematische Schrägansicht eines Teils der Gargerätevorrichtung mit einer Heizeinheit,

Fig. 4

eine schematische Draufsicht der Heizeinheit mit einer Induktionsspule und einer Substrateinheit,

Fig. 5

ein schematisches Verlaufsdiagramm eines Verfahrens zur Herstellung der Gargerätevorrichtung,

Fig. 6a

eine schematische Draufsicht eines Teils einer Gargerätevorrichtung mit einer ersten relativen Anordnung eines Leiters zu einem Faden,

Fig. 6b

eine schematische Draufsicht eines Teils einer Gargerätevorrichtung mit einer zweiten relativen Anordnung eines Leiters zu einem Faden,

Fig. 6c

eine schematische Draufsicht eines Teils einer Gargerätevorrichtung mit einer dritten relativen Anordnung eines Leiters zu einem Faden,

Fig. 7a

eine schematische Draufsicht eines Teils einer Gargerätevorrichtung mit einem von der Seite minimal beabstandeten weiteren Faden und einem von der gegenüberliegenden Seite minimal beabstandeten Faden,

Fig. 7b

eine schematische Draufsicht eines Teils einer Gargerätevorrichtung mit einem von der Seite minimal beabstandeten weiteren Faden und einem von der gegenüberliegenden Seite mit einem Abstand verlaufenden Faden,

Fig. 7c

eine schematische Draufsicht eines Teils einer Gargerätevorrichtung mit einem an der Seite mit einem Abstand verlaufenden weiteren Faden und einem von der gegenüberliegenden Seite minimal beabstandeten Faden,

Fig. 8a

eine schematische Draufsicht eines Ausschnitts einer Gargerätevorrichtung mit einem einen Leiter kreuzenden Faden, welcher am Leiter anliegt,

Fig. 8b

eine schematische Draufsicht eines Ausschnitts einer Gargerätevorrichtung mit einem einen Leiter kreuzenden Faden, welcher abschnittsweise mit einem Abstand zum Leiter verläuft, und

Fig. 9

ein schematisches Verlaufsdiagramm eines weiteren Verfahrens zur Herstellung der Gargerätevorrichtung aus Fig. 8b.

Show it:

Fig. 1

a schematic front view of a cooking appliance with a cooking appliance device,

Fig. 2

an exploded view of part of the cooking device,

Fig. 3

a schematic oblique view of a part of the cooking device with a heating unit,

Fig. 4

a schematic top view of the heating unit with an induction coil and a substrate unit,

Fig. 5

a schematic flow diagram of a method for producing the cooking device,

Fig. 6a

a schematic top view of a part of a cooking appliance device with a first relative arrangement of a conductor to a thread,

Fig. 6b

a schematic top view of a part of a cooking appliance device with a second relative arrangement of a conductor to a thread,

Fig. 6c

a schematic top view of a part of a cooking appliance device with a third relative arrangement of a conductor to a thread,

Fig. 7a

a schematic top view of a part of a cooking appliance device with a further thread minimally spaced from the side and a thread minimally spaced from the opposite side,

Fig. 7b

a schematic top view of part of a cooking appliance device with a further thread minimally spaced from the side and a thread running at a distance from the opposite side,

Fig. 7c

a schematic top view of a part of a cooking appliance device with a further thread running at a distance on the side and a thread minimally spaced from the opposite side,

Fig. 8a

a schematic top view of a section of a cooking appliance device with a thread crossing a conductor and resting on the conductor,

Fig. 8b

a schematic top view of a section of a cooking appliance device with a thread crossing a conductor, which runs in sections at a distance from the conductor, and

Fig. 9

a schematic flow diagram of a further method for producing the cooking device Fig. 8b .

Of the multiple objects present in the figures, only one is provided with a reference number.

Fig. 1 shows a cooking appliance 30a. The cooking appliance 30a is designed as an induction oven. The cooking appliance 30a has an outer housing 44a. The outer housing 44a defines an outer contour of the cooking appliance 30a. The outer housing 44a accommodates a user interface 48a of the cooking appliance 30a. The user interface 48a is intended to be operated by an operator to control the cooking appliance 30a. The cooking appliance 30a has an inner housing 42a. The inner housing 42a is made of a ferromagnetic metal. Alternatively, the inner housing 42a could have a non-magnetic material, in particular glass, preferably a glass ceramic. In this alternative embodiment, the inner housing 42a has several heating elements (not shown) which consist of a ferromagnetic metal. The cooking appliance 30a has an oven door 46a. The oven door 46a is in a closed state. The oven door 46a completely covers an opening 52a of a cooking space 28a facing an operator. The oven door 46a and the inner housing 42a together delimit the cooking space 28a from the outside. The cooking appliance 30a has a cooking appliance device 10a. The cooking appliance device 10a is designed as an induction oven device.

Part of the cooking appliance device 10a is in Fig. 2 shown in more detail in an exploded view. The cooking appliance device 10a has the inner housing 42a. The cooking appliance device 10a has two heating units 12a. The heating units 12a are designed to be identical to one another. The heating units 12a are arranged on a top wall 54a and on a bottom wall 56a of the inner housing 42a. Alternatively or additionally, it would be conceivable for heating units 12a to be arranged on side walls or a rear wall of the inner housing 42a. Only one of the heating units 12a will be described below.

The heating unit 12a has an induction coil 14a. When the heating unit 12a is in operation, an alternating current flows through the induction coil 14a and generates an alternating electromagnetic field. The induction coil 14a is plate-shaped. A main extension plane (not shown) of the induction coil 14a runs parallel to a main extension plane of the top wall 54a and the bottom wall 56a. The induction coil 14a has a conductor 16a. The conductor 16a is designed as a single wire. The conductor 16a is designed as a bare individual wire. Alternatively, the conductor 16a could have insulation. The conductor 16a comprises aluminum. Alternatively, the conductor 16a could comprise copper. The conductor 16a is arranged as a rectangular spiral. The conductor 16a is wound around a coil center 34a of the induction coil 14a.

The heating unit 12a has a substrate unit 18a. The substrate unit 18a is designed like a mat. The substrate unit 18a is arranged between the induction coil 14a and the inner housing 42a. The induction coil 14a rests completely on the substrate unit 18a. The substrate unit 18a serves to thermally and electrically insulate the induction coil 14a. The substrate unit 18a consists at least largely of a material which has at least the chemical elements Si and O. The material is a silicate. The substrate unit 18a is fibrous. The substrate unit 18a consists of mineral wool. The substrate unit 18a has basalt fibers. Alternatively or additionally, the substrate unit 18a could contain spar fibers, dolomite fibers, diabase fibers, Have anorthosite fibers and / or coke fibers. The substrate unit 18a can be at least partially pierced to secure the induction coil 14a. The substrate unit 18a consists entirely of a flat textile structure. The substrate unit 18a consists entirely of a basalt fabric. Alternatively, the substrate unit 18a could partially consist of the basalt fabric. The substrate unit 18a has a plurality of passage openings 24a. The passage openings 24a are arranged periodically. The passage openings 24a are arranged along a plurality of straight lines.

The heating unit 12a has a fastening unit 20a (cf. Fig. 3 ). The attachment unit 20a attaches the induction coil 14a to the substrate unit 18a. The fastening unit 20a fastens the conductor 16a movably to the substrate unit 18a in a region relative to the substrate unit 18a. The area extends over the entire extent of the induction coil 14a. The fastening unit 20a has a fastening element. The fastening element is designed as a thread 22a. The induction coil 14a is attached to the substrate unit 18a by means of a seam comprising the thread 22a. The thread 22a is made entirely of silicate. The thread 22a is made entirely of water glass. Alternatively, the thread 22a could consist of mineral wool and/or glass fibers. The thread 22a is guided through part of the passage openings 24a. The thread 22a is guided through the passage openings 24a according to a lockstitch sewing method. When viewed vertically onto the substrate unit 18a, the thread 22a runs completely to the side next to the conductor 16a. The thread 22a runs parallel to the conductor 16a. The thread 22a runs at a distance from the conductor 16a.

The fastening unit 20a has a further fastening element. The induction coil 14a is attached to the substrate unit 18a by means of a further seam having a further thread 32a. The further thread 32a is identical to the thread 22a. The further thread 32a has a further course which is identical to a course of the thread 22a. The further thread 32a is guided through another part of the passage openings 24a. When viewed vertically onto the substrate unit 18a, the further thread 32a runs on a side of the conductor 16a opposite the thread 22a. A distance of the thread 22a to the conductor 16a is at least largely identical to a further distance of the further thread 32a to the conductor 16a before the cooking appliance device 10a is operated.

The fastening unit 20a has a cover element 26a. Alternatively, the fastening unit 20a could have a plurality of cover elements 26a. The cover element 26a has a silicate. The cover element 26a has basalt fibers. Alternatively or additionally, the cover element 26a could have spar fibers, dolomite fibers, diabase fibers, anorthosite fibers and/or coke fibers. The cover element 26a is designed identically to the substrate unit 18a. The cover element 26a is arranged on a side of the induction coil 14a opposite the substrate unit 18a. The cover member 26a and the substrate unit 18a are sewn together within the area. The cover element 26a and the substrate unit 18a are sewn together by means of the seam having the thread 22a. The cover element 26a and the substrate unit 18a are sewn together by means of the further seam having the further thread 32a. The cover element 26a and the substrate unit 18a touch each other in sections in the area. The cover element 26a and the substrate unit 18a form a stop with regard to permitted movement of the conductor 16a. The stop is formed by the seam and the further seam.

The induction coil 14a lies completely against the cover element 26a. Alternatively, the induction coil 14a could rest exclusively in the area on the cover element 26a. The cover element 26a restricts movement of the induction coil 14a on this side. The cover element 26a, the thread 22a and the further thread 32a together define the area. The thread 22a and the further thread 32a form stops to which the substrate unit 18a and the cover element 26a are sewn. The stops restrict movement of the induction coil 14a parallel to a main plane of extension of the induction coil 14a. The substrate unit 18a and the cover element 26a restrict movement of the induction coil 14a in the area perpendicular to the main extension plane of the induction coil 14a. Permitted movements of the conductor 16a include a movement along a direction 40a facing away from a coil center 34a, which, when viewed vertically on the substrate unit 18a, faces away from the coil center 34a of the induction coil 14a. The length of permitted movement along direction 40a is identical to a length by which conductor 16a stretches during operation of cooking apparatus 10a. Permitted movements of the conductor 16a include movement against the direction 40a.

In Fig. 4 the cooking appliance device 10a is shown before operation of the cooking appliance device 10a. For reasons of clarity, the induction coil 14a is in a simplified form Shape shown with a reduced number of turns and a hatched conductor 16a. In addition, the distance of the thread 22a and the further thread 32a from the conductor 16a is shown reduced. The area includes the entire induction coil 14a. The fastening unit 20a has an additional thread 50a. The additional thread 50a runs along the smallest possible rectangle, which just accommodates a projection of the induction coil 14a onto the substrate unit 18a. The additional thread 50a completely bypasses the induction coil 14a. The additional thread 50a serves to stabilize the substrate unit 18a and the cover element 26a. The

Conductor 16a experiences thermal expansion during operation of the cooking device 10a. The thermal expansions produce expansion movements of the induction coil 14a in the direction 40a. The stretching movements are movements of the induction coil 14a that are permitted within the range.

Fig. 5 shows a schematic flow diagram of a method for producing the cooking appliance device 10a. In a winding step 100a, the induction coil 14a is produced by winding the conductor 16a. Alternatively, the induction coil 14a could be manufactured by winding a stranded wire and/or punching out the conductor 16a from a metal plate (not shown).

In an insulation step 110a, the induction coil 14a is placed on the substrate unit 18a and covered with the cover element 26a. The insulation step 110a follows the winding step 100a.

In a sewing step 120a, the substrate unit 18a and the cover element 26a are pierced by a sewing needle. The substrate unit 18a and the cover member 26a are sewn together according to the lockstitch sewing method. The thread 22a is guided through part of the passage openings 24a. The further thread 32a is then guided through another part of the passage openings 24a in an identical manner. The sewing step 120a follows the insulating step 110.

In an assembly step 130a, the heating unit 12a is mounted on the inner housing 42a. The heating unit 12a is screwed to the inner housing 42a. Alternatively, the heating unit 12a could also be clamped and/or riveted to the inner housing 42a.

In the 6a to 9 Further exemplary embodiments of the invention are shown. The following descriptions are essentially limited to the differences between the exemplary embodiments, with components and features remaining the same and functions on the description of the exemplary embodiment Fig. 1 to 5 can be referred. To distinguish between the exemplary embodiments, the letter a is in the reference numerals of the exemplary embodiment in the Fig. 1 to 5 by the letters b to i in the reference numbers of the exemplary embodiments 6a to 9 replaced. With regard to components with the same designation, in particular with regard to components with the same reference numerals, one can in principle also refer to the drawings and/or the description of the exemplary embodiment Fig. 1 to 5 to get expelled.

For the sake of clarity, conductors 16b-g covered by cover elements 26b-g are shown hatched in the following figures.

In Fig. 6a-c A part of each cooking appliance device 10b, 10c, 10d is shown. Induction coils 14b, 14c, 14d of the cooking appliance devices 10b, 10c, 10d are attached to substrate units 18b, 18c, 18d by means of threads 22b, 22c, 22d having seams. Cover elements 26b, 26c, 26d are sewn together by means of the seams having the threads 22b, 22c, 22d. In the cooking appliance device 10b, a thread 22b runs along a side of a conductor 16b that is oriented opposite to a direction 40b facing away from a coil center (not shown) and is minimally spaced from the conductor 16b. The conductor 16b is attached to the substrate unit 18b in a largely immovable manner in the opposite direction to the direction 40b. The substrate unit 18b consists entirely of glass fibers. In the cooking appliance device 10c, a thread 22c runs along one side of a conductor 16c, oriented along a direction 40c facing away from a coil center (not shown), at a distance from the conductor 16c. The conductor 16c is movably attached to the substrate unit 18c along and against the direction 40c. In the cooking appliance device 10d, a thread 22d runs along a side of a conductor 16d that is oriented away from the center of the coil (not shown) 40d and is minimally spaced from the conductor 16d. The conductor 16d is immovably attached to the substrate unit 18d along the direction 40d.

In Fig. 7a-c a part of cooking appliance devices 10e, 10f, 10g is shown. In the cooking appliance devices 10e, 10f, 10g, threads 22e, 22f, 22g and further threads 32e, 32f, 32g run along opposite sides of ladders 16e, 16f, 16g. In the cooking appliance device 10e, the thread 22e and the further thread 32e run at a minimal distance from the conductor 16e. The conductor 16e is immovably attached to a substrate unit 18e along and against a direction 40e facing away from a coil center (not shown). A thread 22f runs in the cooking appliance device 10f Distance to a conductor 16f. Another thread 32f runs at a minimal distance from the conductor 16f. The conductor 16f is immovably attached to a substrate unit 18f in a direction 40f facing away from a coil center (not shown). In the cooking appliance device 10g, a thread 22g runs at a minimal distance from a conductor 16g. The thread 32g runs at a distance from a conductor 16g. The conductor 16g is immovably attached to a substrate unit 18g along a direction 40g facing away from a coil center (not shown).

In Fig. 8a-b a part of cooking appliance devices 10h, 10i is shown. Induction coils 14h, 14i of the cooking appliance devices 10h, 10i are completely sewn to substrate units 18h, 18i by threads 22h, 22i. In the cooking appliance devices 10h, 10i, the thread 22h, 22i runs at periodic intervals over a conductor 16h, 16i. The thread 22h, 22i each runs in a zigzag pattern. Passage openings 24h, 24i each form reversal points of the zigzag pattern. The threads 22h, 22i are each guided through the passage openings 24h, 24i according to a Zigzag sewing method. Alternatively, the threads 22h, 22i could each run in sections parallel to the conductors 16h, 16i. In the cooking appliance device 10h, the conductor 16h is immovably attached to the substrate unit 18h along a main extension plane of the induction coil 14h. The conductor 16h is designed as a stranded wire. In the cooking appliance device 10i, some of the passage openings 24i run at a distance from the conductor 16i. The part of the through openings 24i is arranged on a side of the conductor 16i aligned along a direction 40i facing away from a coil center (not shown). The conductor 16i is immovably attached to the substrate unit 18i in the opposite direction to the direction 40i. The cooking appliance devices 10h, 10i do not have any cover elements. The seams having the threads 22h, 22i each sew the induction coils 14h, 14i to one of the substrate units 18h, 18i.

In Fig. 9 a flow chart of a method for producing the cooking appliance device 10i is shown. In a positioning step 140i, the induction coil 14i is arranged on the substrate unit 18i in an unwound state.

In an embroidery step 150i, the induction coil 14i is simultaneously wound and the thread 22i is guided through the passage openings 24i according to the Zigzag sewing method. The embroidery step 150i follows the positioning step 140i.

In an assembly step 160i, the heating unit 12i is mounted on the inner housing (not shown). The heating unit 12i is screwed to the inner housing. Alternatively, the heating unit 12i could also be clamped and/or riveted to the inner housing.

Reference symbols

10

Cooking device device

12

Heating unit

14

induction coil

16

Director

18

Substrate unit

20

Fastening unit

22

thread

24

Passage opening

26

Cover element

28

cooking space

30

cooking device

32

thread

34

Coil center

40

Direction

42

Inner casing

44

Outer casing

46

oven door

48

User interface

50

thread

52

opening

54

ceiling wall

56

floor wall

100

Winding step

110

Isolation step

120

Sewing step

130

Assembly step

140

Positioning step

150

Embroidery step

160

Assembly step

Claims (12)

1. Cooking appliance device (10a-d; 10f-g; 10i), in particular induction oven device, having at least one heating unit (12a-d, 12f-g; 12i), which has at least one induction coil (14a-d; 14f-g; 14i) with at least one electric conductor (16a-d; 16f-g; 16i), at least one substrate unit (18a-d, 18f-g; 18i) and at least one fastening unit (20a-d; 20f-g, 20i), which fastens the induction coil (14a-d, 14f-g; 14i) to the substrate unit (18a-d; 18f-g; 18i), wherein the fastening unit (20a-d; 20f-g; 20i) fastens the conductor (16a-d; 16f-g; 16i) in at least one region on the substrate unit (18a-d; 18f-g; 18i) so as to be movable relative to the substrate unit (18a-d; 18f-g; 18i), characterised in that the fastening unit (20a-i) has at least one thread (22a-i) and the induction coil (14a-i) is fastened to the substrate unit (18a-i) by means of at least one joint having the thread (22a-i).
2. Cooking appliance device (10a; 10e-g) according to claim 1, characterised in that the fastening unit (20a; 20e-g) has at least one further thread (32a; 32e-g) and the induction coil (14a; 14e-g) is fastened to the substrate unit (18a; 18e-g) by means of at least one further joint having the further thread (32a; 32e-g).
3. Cooking appliance device (10h-i) according to claim 1 or 2, characterised in that the thread (22h-i) runs at least in sections across the conductor (16h-i) when viewed at right angles onto the substrate unit (18h-i).
4. Cooking appliance device (10a-g) according to one of to the preceding claims, characterised in that the thread (22a-g) runs at least in sections laterally adjacent to the conductor (16a-g) when viewed at right angles onto the substrate unit (18a-g).
5. Cooking appliance device (10a-10e-g) at least according to claims 2 and 4, characterised in that the further thread (32a; 32e-g), when viewed at right angles onto the substrate unit (18a; 18e-g), runs at least in sections laterally adjacent to the conductor (16a; 16e-g) and on a side of the conductor (16a; 16e-g) which faces the thread (22a; 22e-g).
6. Cooking appliance device (10a) according to one of the preceding claims, characterised in that the region has at least two opposing subregions with respect to a coil centre (34a) of the induction coil (14a), in which subregions the fastening unit (20a) fastens the conductor (16a) movably to the substrate unit (18a) in each case relative to the substrate unit (18a).
7. Cooking appliance device (10a-c; 10f; 10i) according to one of the preceding claims, characterised in that permitted movements of the conductor (16a-c; 16f; 16i) comprise at least one movement along directions (40a-c; 40f 40i), which radially face away from a coil centre (34a; 34b) of the induction coil (14a-c; 14f; 14i).
8. Cooking appliance device (10a-g) according to one of the preceding claims, characterised in that the fastening unit (20a-g) has at least one cover element (26a-g), which is arranged at least in the region on a side of the induction coil (14a-g) facing the substrate unit (18a-g) and on this side restricts a movement of the induction coil (14a-g).
9. Cooking appliance device (10a-g) according to claim 8, characterised in that the substrate unit (18a-g) and the cover element (26a-g) touch at least in sections in the region and form at least one stop with respect to a permitted movement of the conductor (16a-g).
10. Cooking appliance device (10a-g) according to claim 8 or 9, characterised in that the cover element (26a-g) is embodied at least essentially identical to the substrate unit (18a-g).
11. Cooking appliance (30a), in particular induction oven, having at least one cooking appliance device (10a) according to one of the preceding claims.
12. Method for producing a cooking appliance device (10a-i), in particular an induction oven device, in particular according to one of claims 1 to 11, with at least one heating unit (12a-i), which has at least one induction coil (14a-i) with at least one electric conductor (16a-i) and at least one substrate unit (18a-i), wherein the induction coil (14a-i) is fastened to the substrate unit (18a-i), wherein the conductor (16a-i) is fastened in at least one region to the substrate unit (18a-i) so as to be movable relative to the substrate unit (18a-i), characterised in that the induction coil (14a-i) is fastened to the substrate unit (18a-i) by means of at least one joint having a thread (22a-i).

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