Cooktop system with inlet nozzle

Abstract

Cooktop system (1) comprising 1.1. a cooktop (3) with 1.1.1. at least one cooking zone (4) and 1.1.2. at least one opening (2) for extracting cooking fumes downwards, 1.2. wherein a support structure (10) with a plurality of unit cells (13) is inserted into the at least one opening (2) having an inlet nozzle (5), characterized in that 1.3. a plurality of pin-shaped or scale-shaped elements (18) are arranged on the support structure (10).

Description

The invention relates to a cooktop system comprising an inlet nozzle for an intake opening of a device for extracting cooking fumes according to the preamble of claim 1. From DE 20 2011 005 698 U1, a cooktop with a central intake opening for extracting cooking fumes downwards is known. It is also known from the prior art to insert a protective grille into the intake opening. From EP 3 268 670 B1 a cooktop with a centrally arranged intake opening and an inlet nozzle inserted therein is known. DE 197 02 337 A1 relates to an air heater with a hot air blower arranged in a housing for conveying hot air from an air inlet opening to an air outlet opening of the housing and a protective grille basket with air passage openings covering the air inlet opening or the air outlet opening, which is attached to the outside of the housing with its basket rim. DE 10 2016 107 190 B3 relates to a filter fan comprising a blower, a filter element, and a protective grille for the blower, all arranged in the direction of airflow, with the protective grille spaced apart from the filter element. This design is characterized by the filter element resting on support struts, with at least one support strut being connected to the protective grille by a spacer element for stabilizing the protective grille, which bridges the gap between the filter element and the protective grille. DE 10 2010 062 892 A1 discloses a flow grid for use in a flow pipe of a flowing fluid medium. The flow grid has a plurality of passages through which the flowing fluid medium can flow in a main flow direction. One of the aims of the invention is to improve a cooktop system. This problem is solved by a cooktop system with the features of claim 1. The cooktop system comprises at least one cooking zone with at least one cooking area and at least one opening for extracting cooking fumes downwards. The cooktop is, in particular, a glass plate, especially a glass-ceramic plate. The cooktop may also be made of metal. The cooktop system typically has at least two, in particular at least three, and in particular at least four cooking zones. The extraction opening can be located centrally in the cooktop. It can be round, particularly circular. It can also be elongated, particularly rectangular. The corners can be rounded. The extraction opening can also be square or cross-shaped. The cooktop system is preferably designed as a combination unit. This means that it includes at least one cooking zone and a device for extracting cooking fumes. The cooking zone and the extraction device are, in particular, integrated into a single unit. This is therefore also referred to as a mounting unit. The core of the invention consists in designing the insert as an inlet nozzle which has a plurality of pin-shaped elements. The inlet nozzle can remain in the intake opening during operation of the cooking fume extraction device. It does not need to be removed for this purpose. However, it can be reversibly removed from the intake opening, for example, for cleaning. In particular, it can be removed from the intake opening without tools. The pin-shaped elements can have different functions. In particular, they form a filtering device. The number of pin-shaped elements can be, in particular, at least 9, in particular at least 16, in particular at least 25, in particular at least 36, in particular at least 49, in particular at least 100. The number of pin-shaped elements is preferably at most 1000, in particular at most 500, in particular at most 300. The total surface area can be increased by using a large number of the pin-shaped elements. According to one aspect of the invention, the pin-shaped elements are arranged in a regular pattern, in particular uniformly distributed. The inlet nozzle can have a round, particularly a circular, outer circumference. It may be possible to provide symmetry-breaking means on the outer circumference of the inlet nozzle. This allows for a clearly defined, predetermined orientation of the inlet nozzle in the intake opening to be enforced or ensured. The inlet nozzle can also have a square, in particular a rectangular, especially an elongated or square outer circumference. The inlet nozzle includes a support structure. The pin-shaped elements are arranged on the support structure. The pin-shaped elements can be formed as a single unit with the support structure. It is also possible to design the inlet nozzle in multiple parts. In this case, the pin-shaped elements can be individually removable from the support structure or as a single, cohesive unit. It is particularly possible to design the inlet nozzle as a multi-part assembly, with the components being reversibly and detachably connected to one another. The inlet nozzle can, in particular, consist of two or three separate components. These components can be reversibly separated and reassembled without tools. This facilitates cleaning of the inlet nozzle. Furthermore, it allows for greater flexibility, especially with regard to the design of the inlet nozzle. According to another aspect of the invention, the support structure is designed as a lattice structure or honeycomb structure. This results in particularly high mechanical stability. The supporting structure can, in particular, comprise a plurality of struts, especially struts arranged perpendicular to one another. It can, in particular, comprise at least 5, in particular at least 7, in particular at least 10 struts, essentially equidistant, in particular parallel to one another, along a first direction and a corresponding number along a second direction perpendicular to this. The struts can be composed of separate sections. In particular, they can extend parallel to the x and y directions of a Cartesian coordinate system. Additional struts can also be arranged diagonally to these directions. The struts can be continuous. The struts can also be curved. In particular, they can be doubly curved. They can, in particular, be designed as cutouts from doubly curved shells. Here, the axes of the main curvatures can be oblique, in particular perpendicular, to each other. Instead of a curved design, the struts can also be formed from flat sections, each of which has a kink at a connecting edge. This will also be understood as a curved design in the following. The struts can be designed in a scale-like form. They can be designed in a scale-like or spoon-like form, particularly in sections. This makes it possible to design the support structure such that the minimum flow cross-section of the unit cells is larger than the optically transparent area of ​​the unit cells when viewed in vertical projection. In other words, the proportion of the shadowed area of ​​the support structure to the total cross-sectional area of ​​the inlet nozzle is greater than the proportion of its cross-sectional area at a specific, and in particular any, height. The shadowed area is, in particular, at least 10%, in particular at least 20%, in particular at least 30%, and in particular at least 50% larger than the minimum area of ​​the support structure in the cross-section. This enables an optically dense appearance of the inlet nozzle while simultaneously ensuring good flow permeability. The shadow area of ​​the support structure is understood here to be the area of ​​the shadow cast by the support structure in a vertical projection. The area ratio of the supporting structure, on the other hand, refers to its cross-sectional area at a specific height. In a support structure where all struts are flat and aligned parallel to the main axis of the inlet nozzle, the shadowed area of ​​the support structure corresponds exactly to its cross-sectional area. According to a further aspect of the invention, the grid structure is formed from a plurality of unit cells or honeycombs. The unit cells preferably each have an identical outer circumference. It is also possible to form a grid structure with different unit cells, in particular with unit cells having different outer circumferences. The grid structure comprises, in particular, one, two, three, four, or more subsets of unit cells. The unit cells of a given subset each have identical dimensions. The unit cells of different subsets each have different dimensions. The number of unit cells in the subsets is in particular at least 10, in particular at least 20, in particular at least 30, in particular at least 50. The unit cells can have a triangular, square, or hexagonal cross-section. They can also have a cruciform cross-section. The unit cells can also have a curved boundary, at least in sections. This boundary is formed in particular by the struts described above. The unit cells are specifically designed to allow the tiling of the plane. In particular, they can enable a gapless tiling of the plane. It is also possible that a space for one of the peg-shaped elements remains in the area between adjacent unit cells. According to another aspect of the invention, the grid structure is formed from unit cells with identical outer perimeter, wherein of two laterally adjacent unit cells, one has a free inner cross-section and a wall traversing the inner cross-section. The wall crossing the inner cross-section runs in a diagonal direction of the respective unit cell. There can therefore be two different types of unit cells. Identical unit cells can each be diagonally adjacent to one another. In particular, they can each have exactly one common corner. Here, two unit cells adjacent at an angle, that is, two unit cells which share a common corner and which both have a wall crossing the internal cross-section, can be oriented such that the two walls crossing the internal cross-sections are each rotated 90° relative to each other. According to a further aspect of the invention, the support structure is designed as a compression element. The support structure can, in particular, be designed as a networked structure. The support structure, in particular the unit cells and / or the pin-shaped elements, can be designed and / or arranged such that the flow cross-section exhibits constrictions and / or expansions in the flow direction, i.e., parallel to a central axis of the inlet nozzle. The flow cross-section can also exhibit a combination of constrictions and expansions. In particular, the flow cross-section can be hourglass-shaped in certain areas. This information applies in particular to the unit cells of the support structure. The support structure and / or the pin-shaped elements can also serve as flow-guiding elements or at least perform a flow-guiding function. Particularly in the case of curved, especially doubly curved, struts of the support structure, these can perform a flow-guiding function. For example, this can improve the grease separation rate. According to another aspect of the invention, the pin-shaped elements each have a free end. The pin-shaped elements can have a cross-section that is constant over at least 50%, in particular at least 70%, in particular at least 90% of their length. The cross-section of the pin-shaped elements is in particular in the range of 4 mm2 to 100 mm2, and can in particular be at least 8 mm2, in particular at least 15 mm2, in particular at least 20 mm2. The cross-section of the pin-shaped elements is in particular at most 80 mm2, in particular at most 60 mm2. The pin-shaped elements can also have a cross-section that varies along their length. In particular, they can be tapered towards the free end. It is also possible to design them to widen towards the free end. Combinations of these variations are also possible. Specifically, it is possible to arrange the pin-shaped elements in a row alternately tapering towards the free end and widening towards the free end. The inflow behavior of the nozzle can be influenced by a targeted variation of the cross-section of the pin-shaped elements and / or a targeted arrangement of pin-shaped elements with a cross-section that varies over their length. The pin-shaped elements can have a length of at least 5 mm, in particular at least 1 cm, in particular at least 1.5 cm, in particular at least 2 cm, in particular at least 3 cm, in particular at least 4 cm, in particular at least 5 cm. The length is preferably measured from the upper side of the support structure facing the pin-shaped elements. It can also be measured from the underside of the support structure facing away from the free ends of the pin-shaped elements. The underside of the support structure can be flat. The underside of the support structure can also be convex or concave. The pin-shaped elements can be designed so that all their free ends lie in a common plane. This makes it possible to place objects, such as cooking utensils, on the inlet nozzle. According to another aspect of the invention, the pin-shaped elements are connected to the support structure, which is designed as a lattice structure, in the area of ​​intersection points. The pin-shaped elements are arranged in straight rows, particularly at the corners of a square grid. The pin-shaped elements can be designed and / or arranged in such a way that the viewing angle through the inlet nozzle is at most 90°, in particular at most 80°, in particular at most 70°, in particular at most 60°. The viewing angle is defined here as the maximum angle between two different directions from which one can see through the inlet nozzle. A reduction in the viewing angle range can also be achieved through a suitable design of the support structure. In particular, a curved design of the support structure struts or a design with one or more kinks can lead to a reduction in the viewing angle range. Furthermore, the support structure can be designed such that it has a free passage area of ​​a maximum of 70%, in particular a maximum of 50%, in particular a maximum of 30%, in particular a maximum of 20%, in particular a maximum of 10%. The free passage area is understood here to be the maximum ratio of an area not shaded by the support structure to the total area of ​​the inlet nozzle for any projection, in particular for vertical projection. The pin-shaped elements can be integrally bonded to the support structure. In particular, they can be formed as a single piece with the support structure. The pin-shaped elements can also be designed separately from the support structure. In particular, they can be detachably, and especially reversibly, connected to the support structure. They can, in particular, be inserted into designated structural elements of the support structure. Here, the pin-shaped elements can each be individually connected to the support structure. It is also possible to design the entirety of the pin-shaped elements as a single, cohesive part. This part can be reversibly connected to the support structure, in particular by being plugged together. The pin-shaped elements can have a length-to-cross-sectional ratio of at least 0.2 / mm, in particular at least 0.3 / mm, and in particular at least 0.5 / mm. A larger length-to-cross-sectional ratio increases the free flow cross-section while maintaining the same contact area. The total surface area of ​​each of the pin-shaped elements can be at least 100 mm², in particular at least 200 mm², in particular at least 300 mm², in particular at least 500 mm². The surface of the pin-shaped elements can serve as a reaction surface, either entirely or at least partially. The total surface area of ​​all pen elements can be at least 100 cm2, at least 200 cm2, at least 300 cm2, and at least 500 cm2. A larger overall surface area of ​​the pins results in a larger total area available as a reaction surface, especially for filtering processes. The pin-shaped elements can also cause turbulence in the incoming air. This can lead to an increase in the contact time of the incoming air with a filter device. According to another aspect of the invention, the pin-shaped elements each have a free end, wherein the free ends of two nearest neighbors of the pin-shaped elements are each designed differently. The free ends of the pin-shaped elements can be beveled, particularly on two opposite sides. They can be beveled in a roof-like manner. In this case, the gable end can run along a diagonal of the cross-section of the pin-shaped elements. This is also referred to as a diamond-shaped formation of the free ends. It can be arranged that each of the pin-shaped elements adjoins exactly one of the unit cells of the supporting structure, whose wall, crossing the inner cross-section, converges on the pin-shaped element. In this case, the orientation of the gable end of the chamfers can be parallel, in particular extending from the wall crossing the inner cross-section. According to a further aspect of the invention, the areal density of the pin-shaped elements is at least 0.1 cm⁻², in particular at least 0.2 cm⁻², in particular at least 0.3 cm⁻², in particular at least 0.5 cm⁻², in particular at least 1 cm⁻². The areal density of the pin-shaped elements can in particular be at most 4 cm⁻². A higher surface density results in a smaller free flow cross-section at the inlet nozzle. A higher surface density of the pin-shaped elements results in a larger reaction area for them. According to a further aspect of the invention, the free flow cross-section of the inlet nozzle is at least 25% of the total cross-section of the inlet nozzle. In particular, the free flow cross-section is at most 90%, in particular at most 70%, and in particular at most 50% of the total cross-section of the inlet nozzle. This refers in particular to any cross-section of the inlet nozzle perpendicular to its main axis. It can also refer to a specific cross-section perpendicular to the main axis of the inlet nozzle, for example, the cross-section at which the free flow cross-section is smallest or largest. The inlet nozzle has a perforated surface. The free flow cross-sections of the unit cells of the support structure can form the perforations. The inlet nozzle can form a compression element. According to a further aspect of the invention, the inlet nozzle is formed at least partially from a heat-resistant plastic up to at least 250°C. The inlet nozzle can also be formed at least partially from metal. The inlet nozzle can also be used to place hot objects, especially cookware. According to a further aspect of the invention, the inlet nozzle has a total extent of at least 1 cm, and in particular at least 2 cm, in a direction parallel to a central axis. The total extent of the inlet nozzle in this direction is in particular at most 10 cm, and in particular at most 5 cm. The free ends of the pin-shaped elements can project beyond an outer boundary, in particular a limiting ring of the inlet nozzle, in a direction parallel to a central axis. They can also be flush with the outer boundary of the inlet nozzle in the direction of the central axis or be recessed downwards against the outer boundary. According to a further aspect of the invention, the inlet nozzle is designed as a filter device or connected to a filter. In particular, it can be designed as a grease filter and / or odor filter and / or moisture filter, or connected to a corresponding filter. This aspect is also independent of the geometric structure and the design of the inlet nozzle. According to one variant, the pin-shaped elements can also be omitted. In this case, the inlet nozzle only has a support structure as described above. Even in this variant, it can have a narrow viewing angle range. In particular, it can have a small free transmission area. In a design without the pin-shaped elements, the struts of the supporting structure can, in particular, perform a flow-guiding function. They can, in particular, lead to turbulence in the incoming air. They can thereby create a filter effect. According to another variant, scale-like elements are provided instead of the pin-shaped elements. The scale-like elements can, in particular, have a curved, especially a doubly curved, shape. They can be designed as individual, separate elements or form a single, coherent structure. For further details, reference is made to the preceding description, in particular to the properties of the pin-shaped elements and their arrangement on the support structure. Further details and specifics of the invention are described with reference to Figures 1, 2 to 3. Figure 1 shows, by way of example, a top view of a cooktop system with four cooking zones, an opening for extracting cooking fumes downwards, and an inlet nozzle inserted into this opening; Figure 2 shows, by way of example, a variant of an inlet nozzle for insertion into the extraction opening of the cooktop system according to Figure 1; and Figure 3 shows a side view of the inlet nozzle according to Figure 2. Fig. 1 shows an exemplary hob system 1 with an opening 2 for extracting cooking fumes downwards. The cooktop system 1 includes a cooktop 3. The cooktop 3 comprises a glass plate or a glass-ceramic plate. The cooktop 3 has four cooking zones 4. The cooktop system 1 also includes a device for extracting cooking fumes, not shown in the figures. This device is located, in particular, below the cooktop 3. It can be located directly on the cooktop 3 or on a component for operating the cooktop system 1. The cooktop system 1 is, in particular, a combination appliance. The cooktop system 1 is, in particular, designed as a pre-assembled unit. For further details, reference is made, by way of example, to EP 2 975 327 B1. An inlet nozzle 5 is inserted into opening 2. Details of the inlet nozzle 5 are described below with reference to the exemplary Fig. 2 and Fig. 3. Figures 2 and 3 show a top and side view of a variant of the inlet nozzle 5. The inlet nozzle 5 has a circular rim 6. The rim 6 can be made of plastic, in particular a plastic heat-resistant up to at least 250°C, or of metal. The rim 6 tapers conically in the inlet direction 7. This facilitates the insertion of the inlet nozzle 5 into the opening 2. A flank angle b is preferably in the range of 1° to 10°. The boundary 6 has a shoulder 8. The boundary 6 has, in particular, an upper edge 9 which projects beyond the rest of the boundary 6 in a direction perpendicular to the inflow direction 7. The upper edge 9 can be bead-like. It can also have a flat upper surface. The upper edge 9 can also be designed as a decorative ring, for example made of metal. In particular, it can be visually distinguished from the rest of the rim 6. A sealing element, for example in the form of an O-ring, can be arranged in the area of ​​the system shoulder 8. Such a sealing element is preferably detachably connected to the inlet nozzle 5. It can be removed, in particular for cleaning purposes. The boundary 6 surrounds in particular a support structure 10. The support structure 10 comprises a plurality of struts 11. At least some of the struts 11 are aligned parallel to the axes of a Cartesian coordinate system. The struts 11 are particularly straight. They have, in particular, straight sections 12. The struts 11 can also be continuous. The supporting structure 10 forms, in particular, a lattice structure. The lattice structure comprises a multitude of unit cells 13. The struts 11 define a plurality of unit cells 13. According to the variant in Fig. 2, the unit cells 13 are essentially square. In particular, they are cross-square. This means that they have a cross-shaped free internal cross-section inscribed in a square base. The unit cells 13 are arranged in rows 14 and columns 15. Laterally adjacent unit cells 13 each share a common section 12 of a strut 11. Of any two laterally adjacent unit cells 13, one has a free internal cross-section, while the other has a diagonally extending cross strut 16. At each of the intersection points of the struts 11, exactly one of the cross struts 16 ends. In rows 14 and columns 15, unit cells 13 with a free internal cross-section alternate with unit cells 13 with a crossbar 16. Within a given row 14 or column 15, all crossbars 16 have the same orientation. The crossbars 16 of adjacent rows 14 or adjacent columns 15 are rotated 90° relative to each other. A unit cell 13 with a free internal cross-section is in particular adjacent to two unit cells 13 with crossbars 16 in a first direction and to two unit cells 13 with crossbars 16 in a second direction perpendicular to the first direction. A unit cell 13 with a crossbar 16 is laterally adjacent to four unit cells with a free inner cross-section. A unit cell 13 with a crossbar 16 in a first direction is adjacent at a right angle to four unit cells 13 with crossbars 16 in a second direction oriented perpendicular to the first direction. A unit cell 13 with a free internal cross-section is adjacent at a corner to four other unit cells 13 with a free internal cross-section. The support structure 10 is convex in the inflow direction 7, i.e., curved outwards. Alternatively, it can also be flush with a lower edge 17 of the inflow nozzle 5. At the intersection of two struts 11, a pin-shaped element 18 is arranged. The pin-shaped elements 18 have a square cross-section. As shown by way of example in Fig. 1, they can also have a round cross-section. Other cross-sectional shapes are also possible. The pin-shaped elements 18 project beyond the upper edge 9 of the boundary 6 in the direction opposite to the inflow direction 7. This is not strictly necessary. They can also have free ends 19 which lie in a common plane with the upper edge 9 or are set back from the upper edge 9 in the inflow direction. The latter can be advantageous for providing the inflow nozzle 5 with a cover-like closure element. In particular, the inflow nozzle 5 can be sealed airtight, liquid-tight, and / or opaquely with a corresponding cover or cover-like element (not shown in the figures). The free ends 19 of the pin-shaped elements 18 each have a double chamfer 20. The chamfer 20 extends from a gable 21 oriented along a diagonal. The gable 21 is oriented in the direction of the cross brace 16 adjacent to the intersection point. The pin-shaped elements 18 are arranged in rows and columns. Within a given row / column, the orientation of the gables 21 alternates. Along a 45° diagonal, all gables 21 have the same orientation. The pin-shaped elements 18 can each have a roughened surface. This improves contact with the extracted cooking fume stream. The pin-shaped elements 18 can also have a smooth surface. This facilitates the cleaning of the inlet nozzle 5. The inlet nozzle 5 can be cleaned, especially in the dishwasher. It is made of a dishwasher-safe material. According to one variant, the inlet nozzle 5 can be heated in the oven for cleaning, regeneration, and / or activation. It is heat-resistant, in particular, up to a temperature of at least 200°C, in particular at least 250°C, in particular at least 300°C, in particular at least 400°C. The support structure 10 lies behind the pin-shaped elements 18 in the inflow direction 7. In the installed state of the inflow nozzle 5, it is located particularly below the pin-shaped elements 18. The support structure 10 is preferably essentially invisible when the inlet nozzle 5 is inserted into the opening 2. In particular, it is only visible when viewed from a narrowly limited angle range. The design and / or arrangement of the pin-shaped elements 18 can, in particular, suggest a substantially closed surface of the inlet nozzle 5. The inlet nozzle 5 can, in particular, have a perforated surface. The free flow cross-sections of the unit cells 13 can form the perforations. According to one embodiment of the invention, the inlet nozzle 5 can be provided with one or more filter elements. The filter elements can be reversibly and detachably connected to the inlet nozzle 5, particularly to the rim 6 and / or the support structure 10. The filter elements can be replaceable. The filter elements can be grease filters and / or odor filters and / or moisture filters (moisture separators). The inlet nozzle 5 itself, in particular the support structure 10 and / or the pin-shaped elements 18, also have a filtering effect. They can be designed in particular as grease filters and / or as odor filters and / or as moisture filters.

Claims

Cooktop system (1) comprising 1.

1. a cooktop (3) with 1.1.

1. at least one cooking zone (4) and 1.1.

2. at least one opening (2) for extracting cooking fumes downwards, 1.

2. wherein a support structure (10) with a plurality of unit cells (13) is inserted into the at least one opening (2) having an inlet nozzle (5), characterized in that 1.

3. a plurality of pin-shaped or scale-shaped elements (18) are arranged on the support structure (10). Cooktop system (1) according to claim 1, characterized in that the support structure (10) is designed as a lattice structure. Cooktop system (1) according to claim 2, characterized in that the grid structure is formed from one, two, three or more subsets, each with at least ten unit cells (13), wherein the unit cells (13) of the same subset each have an identical outer perimeter. Cooktop system (1) according to one of the preceding claims characterized in that the unit cells (13) each have a boundary which is formed from curved and / or doubly curved struts and / or struts with one, two or more bends. Cooktop system (1) according to one of the preceding claims, characterized in that the inlet nozzle (5) has a viewing angle range of a maximum of 90° and / or a free passage area of ​​a maximum of 70%. Cooktop system (1) according to one of the preceding claims, characterized by a free flow cross-section of the inlet nozzle (5) which is at least as large as 25% of a total cross-section of the inlet nozzle (5). Cooktop system (1) according to one of the preceding claims characterized in that the inlet nozzle (5) is designed in multiple parts, wherein the components are reversibly detachable connected to one another. Cooktop system (1) according to one of the preceding claims, characterized in that 8.

1. the support structure (10) and / or the pin-shaped elements (18) is designed as a grease filter and / or as an odor filter and / or as a moisture filter or that 8.

2. the support structure (10) is connected with a grease filter and / or an odor filter and / or a moisture filter.

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