EP3726930A1 - Induction heating device - Google Patents

Abstract

In order to increase efficiency, an induction furnace device (10a-c) is proposed with at least one inductively heatable heating element (12a-c), with at least one inductor (28a-c) for heating the heating element (12a-c) and with at least one in an assembled state integrally formed with the heating element (12a-c) heat exchanger unit (14a-c), which is provided for the transfer of heat from the heating element (12a-c) to a heating air flow for heating a cooking chamber (16a-c).

Description

The invention relates to an induction furnace device according to claim 1 and a method according to claim 14.

From the pamphlets DE 198 52 617 A1 , DE 198 53 780 A1 and DE 199 08 443 A1 induction ovens are known which heat a cooking space by means of an inductively heatable heating element.

The object of the invention is in particular to provide a device of the generic type with improved properties with regard to efficiency. The object is achieved according to the invention by the features of claims 1 and 14, while advantageous embodiments and developments of the invention can be found in the subclaims.

An induction furnace device is proposed with at least one inductively heatable heating element, with at least one inductor for heating the heating element and with at least one heat exchanger unit, which is formed in one piece with the heating element in an assembled state and which is used to transfer heat from the heating element to a heating air flow for heating a cooking space is provided.

Such a configuration can increase the efficiency, in particular the component efficiency and / or advantageously the efficiency of a heat exchange. In particular, additional components for transferring the heat from the heating element to the heat exchanger unit can be dispensed with. Air gaps between the heating element and the heat exchanger unit can advantageously be avoided. A compact construction of the heating element and the heat exchanger unit can be achieved particularly advantageously.

An “induction furnace device” should be understood to mean in particular at least a part, in particular a subassembly, of an induction furnace. In particular, the induction furnace device can also include the entire induction furnace include. An “induction oven” is to be understood in particular as an oven which is provided to cook at least one item to be cooked by means of an inductively heated heating element. In this context, "inductive heating" is to be understood as meaning, in particular, a conversion of electrical energy into heat, in which at least one inductor of the induction furnace device first converts the electrical energy into at least one electromagnetic alternating field, which occurs within at least one inductively heatable material, preferably within the Heating element that generates heat.

In this context, the fact that an element can be "inductively heated" is to be understood as meaning that the element is intended to generate heat when the electromagnetic alternating field generated by the inductor acts on the element through induced eddy currents and / or magnetic reversal effects. In particular, the element provides a thermal output of at least 500 W, advantageously at least 750 W and preferably at least 1000 W, in at least one operating state. The element is advantageously suitable for radiating sufficient thermal energy and / or transferring it to the flow of heating air in order to cook at least one item to be cooked. In particular, the element has at least one ferromagnetic and / or ferrimagnetic material. In particular, the element is designed differently from a heating unit which, for example, could have at least one inductor. In particular, the element is designed to be different from additional materials which primarily serve to provide corrosion protection, adhesion, introduction of the alternating magnetic field into the element and / or aesthetics.

It would be possible for the inductor to be designed as a three-dimensionally wound induction coil or as a single coil turn. The inductor is preferably designed as a flat coil.

"In one piece" is to be understood in particular to be at least cohesively connected, for example by a welding process, a soldering process, an adhesive process, an injection molding process and / or another process that appears sensible to a person skilled in the art, and / or advantageously formed in one piece, such as, for example, by a production from a cast and / or by a Manufactured in a single or multi-component injection molding process and advantageously from a single blank.

It would be conceivable that the heat exchanger unit has ribs and / or fins in order to provide heat transfer surfaces for transferring heat from the heat exchanger unit to the hot air flow. In particular, the heat exchanger unit can also have other elements known to the person skilled in the art in order to provide the heat transfer surfaces. The heat exchanger unit particularly advantageously has at least one material with a thermal conductivity of at least 100 W / (m · K), advantageously at least 150 W / (m · K) and preferably at least 200 W / (m · K) at 0 ° C. For example, the heat exchanger unit could have aluminum and / or copper and / or graphene and / or other materials that appear sensible to a person skilled in the art. The induction furnace device in particular has at least one air guiding unit which defines the flow of heating air and advantageously guides it past a large part, preferably an entirety, of the heat exchanger unit.

In particular, the induction furnace device has at least one furnace muffle which defines the cooking space. The fact that an object “defines” a space should be understood in particular to mean that the object defines at least one interface in which the object and the space touch. The oven muffle has at least one loading opening through which food to be cooked can be introduced into the cooking space. In particular, the induction furnace device has at least one furnace door which, when the furnace door is in a closed state, covers the loading opening. The furnace muffle can in particular have a plurality of connected plate-shaped elements. The fact that an object is "plate-shaped" is to be understood in this context in particular that an imaginary smallest possible cuboid, which just barely holds the object, has a thickness that is a maximum of 50%, in particular a maximum of 20%, advantageously a maximum of 10% , preferably a maximum of 5%, corresponds to a length and / or a width of the cuboid.

The furnace muffle advantageously has at least one impact wall. A "baffle wall" is to be understood in particular as a plate-shaped element which at least partially delimits the cooking space in one direction, in particular in a depth direction, and partially defines a course of the heating air flow and in particular part of the Air control unit is. In particular, the baffle wall, together with a remaining furnace muffle, preferably a rear wall of the furnace muffle, defines a heat generation space which is arranged on a side of the baffle wall facing away from the cooking space. The impact wall can advantageously be mounted on the rear wall. The baffle wall preferably has at least one intake opening through which the heating air flow flows from the cooking space into the heat generating space, and preferably at least one exhaust opening through which the heating air flow flows from the heat generating space into the cooking space.

It would be conceivable that the heating element has a cylindrical, spherical or disk-shaped outer contour. In order to further increase efficiency, it is proposed that the heating element have an annular outer contour. The fact that an object is “ring-shaped” is to be understood in particular to mean that the object completely encloses an empty interior space along at least one viewing direction which preferably runs 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 a smallest imaginary cuboid, which just completely encloses the object, and in particular runs through the center of the cuboid. An "annular outer contour" of an object is to be understood as meaning, in particular, the shape of an imaginary tube of minimal volume that just barely accommodates the object, the annular outer contour having a homogeneous cross section with a section perpendicular to a main plane of extension of the outer contour, which is, for example, essentially round or can be essentially flat, in particular rectangular. The fact that the cross section is “essentially” round or “essentially” flat, in particular rectangular, is to be understood in this context, in particular, that at least 70%, advantageously at least 80% and preferably at least 90% of an area of the cross section through a ideal circle or an ideal flat area, in particular an ideal rectangle, which lie completely within the area, can be covered. A uniform arrangement of the heating element in the heating air flow can advantageously be achieved in a material-saving manner. The space required by the heating element can particularly advantageously be kept low.

It would be conceivable that the outer contour is toroidal. In order to further increase the space efficiency, it is proposed that the outer contour be in the form of an annular disk. An “annular disk-shaped” outer contour is to be understood in particular as an annular outer contour which has an essentially flat, in particular rectangular, cross section. A space requirement of the heating element can advantageously be reduced. A mounting of the heating element can be simplified in a particularly advantageous manner.

It is further proposed that the induction furnace device has a fan wheel which, when viewed along its axis of rotation, is at least largely, in particular completely, surrounded by the heat exchanger unit. The fact that the fan wheel is "surrounded" to a large extent, in particular completely, by the heat exchanger unit is to be understood in particular as the fact that a smallest convex shell that just barely accommodates the heat exchanger unit also accommodates the fan wheel at least to a large extent, in particular completely. The fact that the fan wheel is "largely" surrounded by the heat exchanger unit should in particular be understood to mean that the smallest convex envelope takes up at least 60%, advantageously at least 70%, preferably at least 80% and particularly preferably at least 90% of the fan wheel. In particular, the fan wheel is designed as a fan wheel, preferably as a radial fan wheel. The axis of rotation is preferably aligned perpendicular to a wall, preferably the rear wall, of the furnace muffle. Alternatively, the fan wheel could be designed as an axial fan wheel. The fan wheel and / or the heating element are advantageously arranged within the heat generating space in the assembled state. In particular, the fan wheel is part of a fan unit of the induction furnace device, the fan unit having at least one drive unit which is provided to drive the fan wheel and is connected to the fan wheel by a shaft. The drive unit preferably has at least one electric motor and is advantageously arranged outside the cooking chamber. The shaft preferably defines the axis of rotation. In this way, in particular, the efficiency of the heat exchange can be further increased. The entire heating air flow can advantageously be used for heat exchange. It is particularly advantageous to dispense with additional air guiding elements for guiding the flow of heating air from the fan wheel to the heat exchanger unit.

The heat exchanger unit advantageously adjoins the heating element in a materially bonded manner. For example, the heat exchanger unit can be molded in one piece with the heating element, in particular the heat exchanger unit and the heating element can be cast together. The heat exchanger unit is preferably welded and / or soldered and / or glued to the heating element. All sub-elements of the heat exchanger unit are advantageously connected individually to the heating element. Alternatively, the entire heat exchanger unit could connect to the heating element through a single connection. In particular, this can increase flexibility. A shape of the heat exchanger unit can advantageously be selected independently of a shape of the heating element.

In a further embodiment of the invention it is proposed that the heat exchanger unit form at least a partial area of the heating element, in particular the entire heating element. The fact that the heat exchanger unit forms “a partial area of the heating element” should be understood in particular to mean that the heat exchanger unit occupies a volume which is a partial volume of a further volume which the heating element occupies. In particular, the heat exchanger unit and the heating element are made of the same material. The heat exchanger unit preferably forms a multiplicity of partial areas of the heating element which, for example, could be formed separately from one another and arranged at regular intervals from one another. In this way, in particular, cost efficiency and space efficiency can be increased further. Additional components for forming the heat exchanger unit can advantageously be dispensed with. An even more compact design of the heat exchanger unit and the heating element can be achieved particularly advantageously.

It would be conceivable that the heat exchanger unit forms at least a roughened partial area of the heating element. In order to increase the efficiency of the heat exchange even further, it is proposed that the heat exchanger unit have a plurality of folding elements which are part of the heating element. A “folding element” is to be understood as meaning, in particular, a partial area of the heat exchanger unit, the course of which has at least one change in direction. In particular, the change in direction can be along part of the course, preferably the entire Run course and in particular have at least one turning point. The folding element particularly preferably has an arcuate course. In particular, the heating element can consist of folding elements arranged in a row. Alternatively, the heating element could have a plurality of folding elements at regular intervals, which are preferably spaced apart from one another by flat subregions of the heating element. In this way, it can be achieved that the heating element can be mounted on a flat surface and nevertheless the heating air flow can flow around it on an upper side and a lower side.

It is also proposed that the induction furnace device have an inductively heatable further heating element which can be heated by the inductor. It would be possible for the further heating element to be designed differently from the heating element. The heating element and the further heating element are preferably designed to be identical and / or mirror images of one another. In particular, the further heating element can be designed in one piece with a further heat exchanger unit of the induction furnace device. It would be possible for the further heat exchanger unit to be designed differently from the heat exchanger unit. The heat exchanger unit and the further heat exchanger unit are preferably designed to be identical and / or mirror images of one another. The further heat exchanger unit is preferably designed in one piece with the further heating element in a manner identical to the heat exchanger unit and the heating element. It would be possible for the heat exchanger unit and the further heat exchanger unit to contact one another directly. The heat exchanger unit and the further heat exchanger unit are preferably formed at a distance from one another. It would be conceivable that the heating element, the further heating element and the inductor are each spaced apart from one another by an empty space. The heating element, the further heating element and the inductor preferably contact each other, preferably indirectly. As a result, in particular cost efficiency and space efficiency can be further improved. A large increase in the amount of heat available for the flow of hot air can advantageously be achieved by a small increase in the installation space required. It is particularly advantageous to dispense with additional inductors for heating the further heating element.

It would be conceivable that the heating element and the further heating element are arranged on the same side of the inductor. In order to further increase the efficiency of the heat exchange, it is proposed that the heating element and the further heating element are arranged on different sides of the inductor. The fact that the heating element and the further heating element are arranged on "different sides" of the inductor should be understood in particular to mean that at least one straight line exists which penetrates the heating element, the inductor and the further heating element in this order. In particular, the heat exchanger unit and the further heat exchanger unit are spaced apart from one another at least by the inductor. An efficient distribution of the heat generated by the heating elements can advantageously be achieved. An arrangement of the heat exchanger units within the heating air flow can be achieved in a particularly advantageous manner in a simple manner.

It is further proposed that the induction furnace device has a structural unit which has the heating element, in particular the further heating element, the heat exchanger unit, in particular the further heat exchanger unit and the inductor. In particular, the structural unit can additionally have the fan wheel, preferably the entire fan unit and / or at least one thermal insulation and / or at least one electrical insulation. A “structural unit” is to be understood in particular as a structurally coherent unit which is provided in particular for joint assembly, in particular pre-assembly, and which can preferably be assembled and / or disassembled as a whole. In this way, in particular, simple assembly and disassembly of the induction furnace device can be achieved. Components of the structural unit can advantageously be preassembled on the furnace muffle before the structural unit is installed. An exchange of elements and / or units of the induction furnace device can be facilitated particularly advantageously.

It would be conceivable that the structural unit has at least one frame element to which components of the structural unit can be attached. In order to further increase the installation space efficiency, it is proposed that the heating element and the further heating element form layers, in particular cover layers, of the structural unit designed as a sandwich structure. In this way, a thickness of the structural unit can advantageously be reduced. It is also proposed that the structural unit has at least one carrier unit which carries at least the heating element, the inductor and the heat exchanger unit and which can be mounted from the outside on the cooking space. In an alternative embodiment, the structural unit can be mounted and / or dismounted on an inside of the furnace muffle and / or on the baffle wall. In particular, the furnace muffle has at least one recess through which, in the assembled state, at least part of the structural unit protrudes into the cooking space and / or the heat-generating space and which is preferably covered by the structural unit in the assembled state. The carrier unit advantageously has at least one support element, which preferably forms a cover layer of the sandwich structure. The carrier unit particularly advantageously has at least one further support element which can be mounted on a remaining carrier unit and, in particular, provides a holder for components of the structural unit in the assembled state of the structural unit. The support element advantageously has a contact lip which, in particular, engages the recess in the assembled state of the structural unit. In particular, this can further simplify assembly of the structural unit. Assembly and mounting of the heating element, inductor and heat exchanger unit can advantageously be simplified. A number of assembly steps for assembling the structural unit can be reduced particularly advantageously.

A method for producing an induction furnace device is proposed with at least one inductively heatable heating element, with at least one inductor for heating the heating element and with at least one heat exchanger unit, which is provided for transferring heat from the heating element to a heating air flow for heating a cooking space and which is in one piece is formed with the heating element. In particular, this can increase efficiency.

The induction furnace device is not intended to be restricted to the application and embodiment described above. In particular, the induction furnace device can have a number of individual elements, components and units that differs from a number of individual elements, components and units mentioned herein in order to fulfill a functionality described herein.

Further advantages emerge from the following description of the drawings. Three exemplary embodiments of the invention are shown in the drawings. The drawing that The description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations.

Fig. 1

Eine schematische Darstellung eines Induktionsofens mit einer Induktionsofenvorrichtung,

Fig. 2

eine schematische Darstellung einer Baueinheit der Induktionsofenvorrichtung in einer Draufsicht,

Fig. 3

eine schematische Darstellung der Baueinheit in einer Schrägansicht von vorne,

Fig. 4

eine schematische Explosionsdarstellung der Baueinheit und einer Ofenmuffel der Induktionsofenvorrichtung in einer Schrägansicht von der Seite,

Fig. 5

ein schematisches Verlaufsdiagramm eines Verfahrens zur Herstellung der Induktionsofenvorrichtung,

Fig. 6

eine schematische Darstellung einer Baueinheit einer alternativen Induktionsofenvorrichtung in einer Draufsicht,

Fig. 7

eine schematische Darstellung einer Baueinheit, einer Gebläseeinheit und einer Ofenmuffel einer weiteren alternativen Induktionsofenvorrichtung in einer Schrägansicht von vorne und

Fig. 8

eine schematische Darstellung der Baueinheit und eines Gebläserads der weiteren alternativen Gebläseeinheit aus Fig. 7 in einer Seitenansicht.

Show it:

Fig. 1

A schematic representation of an induction furnace with an induction furnace device,

Fig. 2

a schematic representation of a structural unit of the induction furnace device in a plan view,

Fig. 3

a schematic representation of the unit in an oblique view from the front,

Fig. 4

a schematic exploded view of the structural unit and a furnace muffle of the induction furnace device in an oblique view from the side,

Fig. 5

a schematic flow diagram of a method for manufacturing the induction furnace device,

Fig. 6

a schematic representation of a structural unit of an alternative induction furnace device in a plan view,

Fig. 7

a schematic representation of a structural unit, a fan unit and a furnace muffle of a further alternative induction furnace device in an oblique view from the front and FIG

Fig. 8

a schematic representation of the structural unit and a fan wheel of the further alternative fan unit Fig. 7 in a side view.

In the figures, only one object of multiple existing objects is provided with a reference symbol.

Figure 1 shows an induction furnace 34a in a schematic representation. The induction furnace 34a has an oven door 56a. The oven door 56a is in a closed state. The induction furnace 34a has an induction furnace device 10a. The induction furnace device 10a is in an assembled state. The induction furnace device 10a has a furnace muffle 58a. The furnace muffle 58a defines a cooking space 16a. The oven muffle 58a and the oven door 56a jointly delimit the cooking space 16a. The cooking space 16a is provided for receiving food to be cooked.

The furnace muffle 58a has a rear wall 46a. The rear wall 46a is designed as a plate-shaped element. The induction furnace device 10a has a baffle wall 48a. The baffle wall 48a is designed as a plate-shaped element. The baffle wall 48a delimits the cooking space 16a in a direction facing away from the rear wall 46a. The baffle wall 48a and the rear wall 46a together define a heat generation space (not shown). The baffle wall 48a can be mounted on the rear wall 46a. Alternatively, the baffle wall 48a could be mounted on parts of the furnace muffle 58a that are different from the rear wall 46a. The baffle wall 48a is part of an air guide unit (not shown) of the induction furnace device 10a. The baffle wall 48a partially defines a course of the heating air flow. The baffle wall 48a has a suction opening 68a. Alternatively, the baffle wall 48a could also have a plurality of suction openings. The heating air flow flows from the cooking space 16a through the intake opening 68a into the heat generating space. The baffle wall 48a has two blow-out openings 70a. Alternatively, the baffle wall 48a could also have any other number of blow-out openings. The heating air flow flows from the heat generating space through the blow-out openings 70a into the cooking space 16a.

The induction furnace device 10a has a structural unit 30a, which in the Figures 2-4 is shown in more detail. The structural unit 30a is provided for pre-assembly. Components of the structural unit 30a can be assembled for pre-assembly prior to assembly of the structural unit 30a. The structural unit 30a can be assembled and disassembled as a whole. The structural unit 30a has an inductively heatable heating element 12a. The heating element 12a has an annular outer contour 18a. The outer contour 18a is in the form of an annular disk. Alternatively, the outer contour 18a could also be toroidal. The heating element 12a comprises cast iron. Alternatively, the heating element 12a can also have other ferromagnetic or ferrimagnetic materials.
The structural unit 30a has a heat exchanger unit 14a. The heat exchanger unit 14a is formed in one piece with the heating element 12a. The heat exchanger unit 14a forms the entire heating element 12a. The heat exchanger unit 14a has a multiplicity of folding elements 24a. The folding elements 24a are designed as arches. The Heating element 12a consists of strung together arcs which form a wave structure. Alternatively, the heating element 12a could consist of arches which are connected to one another by flat partial areas. The heat exchanger unit 14a is provided for the transfer of heat from the heating element 12a to a flow of heating air. The heating air flow is used to heat the cooking space 16a.

The structural unit 30a has an inductor 28a. The inductor 28a is designed as a flat coil. Alternatively, the inductor 28a could also be designed as a single turn or a three-dimensionally wound induction coil. The inductor 28a comprises copper. The inductor 28a is surrounded by a plaster sheath (not shown). Alternatively, the inductor 28a could comprise aluminum and be free of shells.

The structural unit 30a has a fan unit 20a. The fan unit 20a is used to generate the heating air flow. The fan unit 20a has an impeller 40a. The fan wheel 40a is designed as a radial fan wheel. Alternatively, the fan wheel 40a could be designed as an axial fan wheel. The fan unit 20a has a drive unit 36a. The drive unit 36a is used to drive the fan wheel 40a. The fan unit 20a has a shaft 38a. The shaft 38a connects the drive unit 36a to the fan wheel 40a. The shaft 38a is rotatably mounted. The shaft 38a defines an axis of rotation 22a of the impeller 40a. The fan wheel 40a is completely surrounded by the heat exchanger unit 14a when viewed along its axis of rotation 22a. Alternatively, the fan wheel 40a could be only partially surrounded by the heat exchanger unit 14a when viewed. The heat exchanger unit 14a is arranged concentrically around the axis of rotation 22a. The heat exchanger unit 14a is arranged in a main plane of extent of the fan wheel 40a.

The structural unit 30a has thermal insulation 42a. The thermal insulation 42a serves to prevent heat transfer from the heating element 12a to the inductor 28a. The thermal insulation 42a has a mineral wool. Alternatively, the thermal insulation 42a could also have glass wool and / or a foamed plastic and / or a vegetable fiber. The structural unit 30a has electrical insulation 44a. The electrical insulation 44a serves to prevent an electrical current from the inductor 28a to the heating element 12a. The heating element 12a can be mounted on the electrical insulation 44a. The heating element 12a is clipped to the electrical insulation 44a. Alternatively or additionally, the heating element 12a could be adhesively bonded and / or sewn to the electrical insulation 44a. The electrical insulation 44a has micanite. Alternatively, the electrical insulation 44a could also have an elastomer and / or a glass and / or a ceramic. The structural unit 30a has electromagnetic insulation (not shown). The electromagnetic insulation serves to prevent the electromagnetic alternating field of the inductor 28a from acting on further components of the induction furnace device 10a. The structural unit 30a has a further thermal insulation (not shown). The further thermal insulation serves to prevent heat transfer from the inductor 28a to the drive unit 36a of the fan unit 20a. The structural unit 30a can alternatively or additionally have further components of the induction furnace 34a.

The structural unit 30a has a carrier unit 32a. The carrier unit 32a supports the heating element 12a, the heat exchanger unit 14a, the inductor 28a, the fan unit 20a, the thermal insulation 42a, the electrical insulation 44a, the electromagnetic insulation and the further thermal insulation. The carrier unit 32a can be mounted from the outside on the cooking space 16a. The rear wall 46a has a recess 62a. The carrier unit 32a has an external support element 52a. The outer support element 52a can be mounted on the rear wall 46a. Alternatively, the outer support element 52a could also be mounted on other walls of the furnace muffle 58a. The outer support element 52a can be mounted on the rear wall 46a with screw connections (not shown). Alternatively, the outer support element 52a could also be mountable on the rear wall 46a by snap connections and / or plug connections. The impeller 40a of the blower unit 20a and the heating element 12a are arranged inside the heat generating space. The carrier unit 32a has an inner support element 54a. The inner support element 54a has a contact lip 64a. The contact lip 64a engages the recess 62a. The inner support element 54a holds components of the structural unit 30a. The contact lip 64 clamps the inductor 28a, the thermal insulation 42a, the electrical insulation 44a, the electromagnetic insulation and the further thermal insulation against the outer support element 52a. The inner support element 54a can be mounted on the outer support element 52a with screw connections (not shown). Alternatively, the inner support element 54a could also be mountable on the outer support element 52a by snap connections and / or plug connections.

Fig. 5 shows a schematic flow diagram of a method for producing the induction furnace device 10a. In a bending step 110a, a blank of the heating element 12a is bent in order to form the folding elements 24a of the heat exchanger unit 14a. As a result of the bending step 110a, the blank of the heating element 12a becomes the finished heating element 12a. The structural unit 30a is assembled in a pre-assembly step 120a. In the pre-assembly step 120a, the inductor 28a, the thermal insulation 42a, the electrical insulation 44a, the electromagnetic insulation, the further thermal insulation and the heating element 12a are placed on the outer support element 52a in the form of a sandwich structure. The heating element 12a is then clamped onto the electrical insulation 44a. The blower unit 20a is then mounted on the rest of the structural unit. The inner support element 54a is then screwed onto the outer support element 52a. Alternatively, the inner support element 54a can first be screwed onto the outer support element 52a and then the heating element 12a can be clamped onto the electrical insulation 44a. The pre-assembly step 120a follows the bending step 110a. In a mounting step 130a, the structural unit 30a is mounted on the rear wall 46a. In the assembly step 130a, the contact lip 64a of the inner support element 54a is brought into engagement with the recess 62a. The external support element 52a is then screwed onto the rear wall 46a.

In Figures 6 to 8 two further embodiments of the invention are shown. The following descriptions are essentially limited to the differences between the exemplary embodiments, with reference to the description of the exemplary embodiment in relation to components, features and functions that remain the same Figures 1 to 5 can be referenced. To distinguish the exemplary embodiments, the letter a is in the reference numerals of the exemplary embodiment in FIG Figures 1 to 5 by the letter b in the reference numerals of the embodiment of Figure 6 and by the letter c in the reference numerals of the embodiment of FIG Figures 7 and 8th replaced. With regard to components with the same designation, in particular with regard to components with the same reference numbers, the drawings and / or the description of the exemplary embodiment of FIG Figures 1 to 5 to get expelled.

Fig. 6 shows an alternative induction furnace device 10b. The induction furnace device 10b has a heat exchanger unit 14b and a heating element 12b. The heat exchanger unit 14b adjoins the heating element 12b in a materially bonded manner. The heat exchanger unit 14b has a plurality of sub-elements 72b which are designed as pins. The heat exchanger unit 14b is soldered to the heating element 12b. Alternatively, the heat exchanger unit 14b could be welded to the heating element 12b or cast together with the heating element 12b.

Fig. 7 and 8th show another alternative induction furnace device 10c. The induction furnace device 10c has, in addition to an inductively heatable heating element 12c, an inductively heatable further heating element 26c. The further heating element 26c can be heated together with the heating element 12c by an inductor 28c of the induction furnace device 10c. The further heating element 26c is formed in one piece with a further heat exchanger unit 50c. The further heating element 26c is designed identically to the heating element 12c. Alternatively, the further heating element 26c could be designed differently from the heating element 12c. The further heat exchanger unit 50c is designed identically to a heat exchanger unit 14c. Alternatively, the further heat exchanger unit 50c could be designed differently from the heat exchanger unit 14c. The heating element 12c and the further heating element 26c are arranged on different sides of the inductor 28c. The structural unit 30c is designed as a sandwich structure. The structural unit 30c has the heating element 12c, the further heating element 26c, the inductor 28c and two electrical insulations 44c. The inductor 28c forms a core layer of the sandwich structure. The electrical insulation 44c form intermediate layers of the sandwich structure. The heating element 12c and the further heating element 26c form cover layers of the sandwich structure. The rear wall 46c is free of recesses. The structural unit 30c is clamped between the rear wall 46c and the baffle wall, which is not shown for reasons of clarity.

Reference number

10

Induction furnace device

12

Heating element

14th

Heat exchanger unit

16

Cooking space

18th

Outer contour

20th

Blower unit

22nd

Axis of rotation

24

Folding element

26th

Another heating element

28

Inductor

30th

Unit

32

Carrier unit

34

Induction furnace

36

Drive unit

38

wave

40

Impeller

42

Thermal insulation

44

Electrical insulation

46

Back wall

48

Baffle

50

Another heat exchanger unit

52

External support element

54

Inner support element

56

Oven door

58

Furnace muffle

62

Recess

64

Investment lip

68

Intake opening

70

Exhaust opening

72

Sub-elements

110

Bending step

120

Pre-assembly step

130

Assembly step

Claims (14)

Induction furnace device (10a-c) with at least one inductively heatable heating element (12a-c), with at least one inductor (28a-c) for heating the heating element (12a-c) and with at least one integral part of the heating element (12a) in an assembled state -c) formed heat exchanger unit (14a-c), which is provided for the transfer of heat from the heating element (12a-c) to a heating air flow for heating a cooking space (16a-c). Induction furnace device (10a-c) according to Claim 1, characterized in that the heating element (12a-c) has an annular outer contour (18a-c). Induction furnace device (10a-c) according to Claim 2, characterized in that the outer contour (18a-c) is in the shape of an annular disk. Induction furnace device (10a-c) according to one of the preceding claims, characterized by at least one fan wheel (40a-c) which, when viewed along its axis of rotation (22a-c), is at least largely surrounded by the heat exchanger unit (14a-c). Induction furnace device (10b-c) according to one of the preceding claims, characterized in that the heat exchanger unit (14b-c) adjoins the heating element (12b-c) with a material fit. Induction furnace device (10a) according to one of Claims 1 to 4, characterized in that the heat exchanger unit (14a) forms at least a partial area of the heating element (12a). Induction furnace device (10a) according to claim 6, characterized in that the heat exchanger unit (14a) has a plurality of folding elements (24a) which are part of the heating element (12a). Induction furnace device (10c) according to one of the preceding claims, characterized by at least one inductively heatable further heating element (26c) which can be heated by the inductor (28c). Induction furnace device (10c) according to Claim 8, characterized in that the heating element (12c) and the further heating element (26c) are arranged on different sides of the inductor (28c). Induction furnace device (10a-c) according to one of the preceding claims, characterized by a structural unit (30a-c) which has the heating element (12a-c), the heat exchanger unit (14a-c) and the inductor (28a-c). Induction furnace device (10c) according to Claim 10, characterized in that the heating element (12c) and the further heating element (26c) form layers of the structural unit (30c) designed as a sandwich structure. Induction furnace device (10a-b) according to claim 10 or 11, characterized in that the structural unit (30a-b) has at least one carrier unit (32a-b) which at least includes the heating element (12a-b), the inductor (28ab) and the Carries heat exchanger unit (14a-b) and which can be mounted on the outside of the cooking space (16a-b). Induction furnace (34a) with an induction furnace device (10a) according to one of the preceding claims. Method for producing an induction furnace device (10a-c), in particular according to one of Claims 1 to 12, with at least one inductively heatable heating element (12a-c), with at least one inductor (28a-c) for heating the heating element (12a-c) and with at least one heat exchanger unit (14a-c) which is provided for transferring heat from the heating element (12a-c) to a heating air flow for heating a cooking space (16a-c) and which is designed in one piece with the heating element (12a-c) becomes.

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