Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B6/00—Heating by electric, magnetic or electromagnetic fields
  • H05B6/02—Induction heating
  • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
  • H05B6/12—Cooking devices
  • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them

Definitions

• the present invention relates to an induction cooker according to the preamble of claim 1, which has an induction hob provided with a cover.
• This cover serves as a cooking surface on which the pots are placed, which are heated by means of a magnetic field generated by the induction hob.
• Induction stoves are known in which the induction hob, which consists of a large-area coil for generating an alternating magnetic field, is arranged under the cooking surface.
• the cooking surface consists of a glass ceramic plate or a hardened glass plate.
• the large-area coil is traversed by a current that generates the alternating magnetic field.
• This alternating field induces, in a ferromagnetic bottom of a metallic pot placed above the induction hob, heat fluxes which are converted to heat in the bottom of the pot, this heat being transferred to the contents of the pot is transferred.
• the frequencies of the alternating field usually used are in the range of 25 to 50 kHz.
• the induction cookers are offered as built-in cookers. To install the induction cooker, an opening in the circumferential size of the induction cooker is cut into the worktop of a kitchen. The induction hob is inserted into this opening and covered by the glass or glass ceramic plate. The glass or glass ceramic plate stands slightly raised above the worktop. At and below the elevated edge of the glass or glass ceramic plate of the induction cooker can thus easily accumulate dirt and residues of the cooking process, which can only be removed consuming.
• the induction hob has a large-area, current-carrying coil, by means of which the alternating magnetic field already described can be generated.
• the only prerequisite for the material of the worktop is that this passes on the magnetic field generated by the coil of the induction hob to the arranged on the worktop above the induction hob pot.
• the invention has the advantage that the preparation of a glass ceramic or glass plate for covering the induction hob is eliminated.
• the induction hob is mounted in a simple manner under the worktop, the worktop in the field of induction hob not only serves as a cooking surface, but can also be used as a normal work surface for other activities in a kitchen when not in use the induction cooker, since this in the field of Hob has no opening.
• the cleaning of such a continuous, formed by the worktop cooking surface is very easy to clean and requires no special measures.
• pot is intended in the context of this application to include any cooking and / or roasting dishes, which is usually used on a stove, so that, for example, pans, roasting or the like are to be understood by it.
• the worktop can in particular extend laterally beyond the cooking surface. This means that the worktop when installing the kitchen, as hitherto, in the length of the desired work surface is cut and the induction hob at the intended location of the worktop from below at this z. B. is mounted by means of a holder.
• the countertop may comprise a material that is insensitive to the heating that is transferred from the heated pot to the worktop.
• a material that is insensitive to the heating that is transferred from the heated pot to the worktop By using such a material, negative influences (such as heat edges, scratches, etc.) of the pot caused by heat on the worktop are reliably avoided.
• a heat insulation is arranged between a worktop, which consists of a non-refractory material and the pot during the cooking process.
• a worktop which consists of a non-refractory material
• Such a simple thermal insulation medium makes it possible to use the proposed invention for a variety of worktops, which may consist of a variety of materials, which may also be sensitive to heat.
• the thermal insulation is a freely movable coaster, which is placed in the form of a pillow or a plate under the pot at the point on the worktop to which the pot is placed on the induction hob on the worktop.
• the magnetic field generated by the induction hob penetrates the freely movable saucer and reaches the pot to its heating.
• the boiling energy of the magnetic field is not reduced by the heat insulating medium.
• Of the Coaster only absorbs heat released from the heated pot. Due to a very low thermal conductivity, the heat is compensated by the coaster and not forwarded to the worktop.
• the heat insulation medium can also be used outside the cooking surface as a coaster and is therefore versatile. A heat imprint of the pot on the countertop is thus reliably avoided.
• the thermal insulation medium has a preferably thermal conductivity between 0.5 and 0.002 W / (m * K).
• a thermal conductivity for the thermal insulation medium between 0.05 and 0.002 W / (m * K), in particular between 0.035 and 0.002 W / (m * K) is provided.
• Such a heat insulation medium is also suitable for countertops, which experience only a point heating by the heat transfer through the heated pot.
• the freely movable heat insulation medium can also be used in worktop materials, which are considered to be heat resistant, but can not be selectively heated, as is the case for example with granite or simple glass.
• the heat insulation medium is loosely pushed between the worktop and the pot, so that damage to the worktop by heat effects of the pot can be reliably prevented.
• the size and / or the shape of the thermal insulation medium can be designed as desired.
• the heat insulating medium has approximately the peripheral shape and size of the bottom of the pot to securely prevent transmission of the heat generated by the pot to the worktop.
• the dimensions and / or the shape of the heat insulating medium can also be based on the size or the peripheral shape of the individual induction hob. However, they are not limited to this and may differ in size and shape from the bottom of the pot or the induction hob, in particular be designed larger than this.
• the heat insulating medium may range in size over the entire induction hob.
• the thermal insulation medium is made of a hydrophobic silica airgel material (eg, Nanogel O material).
• Such a material has the advantage that it has a low thermal conductivity between 0.02 and 0.01 W / (m * K) and even with small layer thicknesses, such as about one centimeter thick (?), Excellent thermal insulation properties are available.
• the pot when inserting the heat insulating medium from the hydrophobic silica airgel material between the worktop and the pot during the cooking process, the pot is fully warm, the worktop itself remains cold.
• the induction hotplate there is no loss of power in the heating of the pot by the induction hotplate and on the other hand it is reliably avoided that the heat is transferred from the pot to the worktop.
• thermal insulation medium natural materials such as wood and cork and manufactured materials such as foam glass, expanded polystyrene (EPS) insulation materials, extruded polystyrene (XPS) insulation materials, polyurethane (PUR) insulation materials, vacuum insulation panels (VIP), etc
• EPS expanded polystyrene
• XPS extruded polystyrene
• PUR polyurethane
• VIP vacuum insulation panels
• the silica airgel material is designed in the form of an insulating board, whereby it has structurally invariable properties and is therefore particularly suitable as an intermediate layer between the pot and the worktop during the cooking process. Since such an existing of hydrophobic silica airgel material insulation board has moisture-repellent properties, deformation of the insulation board by liquids that escape during the cooking process from the pot are excluded. In addition, such a base allows a stable and secure storage of the pot on the hob or the worktop.
• the worktop has a mineral material at least as a surface material.
• Worktops made of mineral materials which are based in particular on synthetic resin, are hard, scratch-resistant and available in many colors.
• a mineral material that can be used particularly advantageously as a worktop is HI-MACS®, an ecological material made of minerals and acrylic. Due to the placement of the induction cooktop below such a worktop and the use of the heat insulating medium as a base for the pot during cooking must on the heat resistance of the worktop material no Attention.
• the use of such countertops in connection with the cooking hob according to the invention is particularly advantageous because these worktops particularly simple -. For example, only with water - to clean and scratch-resistant, which makes them appear particularly suitable for use in the kitchen.
• Such work plates can be made entirely from the mineral material or have only a surface coating with mineral material, which have a layer thickness between 5 mm and 20 mm.
• the worktop wood or natural stone such. B. granite.
• This increases the variety of possibilities of choosing countertops for a kitchen design.
• the use of a heat insulating medium with low thermal conductivity, in particular hydrophobic silica airgel material between worktop and heated pot allows the use of heat-sensitive material for the worktop too. Since no opening for the use of a cooking surface must be cut into the worktop, but the induction hob or induction field with multiple induction coils is simply attached to the bottom of the worktop, wooden worktops can be particularly advantageous use. But even with natural stone slabs can be dispensed with the laborious zuerstellende opening for the cooking surface, which can significantly reduce the cost of using natural stone slabs.
• the position of the induction cooktop on the worktop is marked by a marking. This can be done by a foil or by a printed marking on the worktop, which illustrate the contours of the induction hob. This ensures that the pot always occupies the optimum position on the worktop in relation to the induction hob, in order to achieve optimum transfer of energy from the induction hob to the pot.
• the induction cooker 1 according to the invention is shown by way of example in a cross section.
• the induction cooker 1 is formed by an induction hob 2, which is fixed from below to a worktop 3 - by means of a holder provided therefor.
• the working plate 3 forms the cover of the upwardly open induction hob 2.
• the induction hob 2 has at least one or more induction regions, each induction region of a flat formed (copper) coil 4, 5 is formed, of which in Fig. 1 two laterally are visible side by side.
• pots 9, 10 or pans 9, 10 or the like are positioned above in the coil 4, wherein between the countertop 3 and the pot 9, which is arranged above the coil 4, a heat insulating medium 1 1 in shape a saucer and between the worktop 3 and the pot 10, which is located above the coil 5, also a coaster with a heat insulating medium 11 is arranged.
• the worktop 3 can consist of a variety of materials or composites, as used today in kitchens.
• wood or granite can be used as a work surface 3 material just like a solid surface material.
• HI-MACS® a mineral material, also known as acrylic stone, which forms a particularly smooth and hard surface, which is available in many colors.
• the worktop 3 is used as a work surface and cut in the assembly of the kitchen in the desired length.
• the induction hob 2 is screwed from below in the desired position on the worktop 3, without, as before, a recess for receiving the induction cooktop 3 must be cut.
• the induction hob 2 used in the present case is approximately square in FIG. 2 and comprises four flat coils 4, 5, 6, 7. Each coil 4, 5, 6, 7 is connected to control electronics 4.1, 5.1, 6.1, 7.1. which can also be designed as common control electronics.
• control electronics 4.1, 5.1, 6.1, 7.1. which can also be designed as common control electronics.
• the areas in which the coils 4, 5, 6, 7 are arranged below the worktop 3 characterized by markings in the form of imprints 4.2, 5.2, 6.2, 7.2, as shown in Fig. 3.
• the areas comprising the markings 4.2, 5.2, 6.2, 7.2 form the working surface 13 of the induction cooker 1.
• a groove-shaped recess 8 is incorporated in the worktop 3, which is the cooking surface of the other Areas of the worktop 3 demarcates.
• This groove-shaped recess 8 has the task to collect cooking liquid, so that they are not distributed to other areas of the worktop 3.
• the desired coil 4, 5, 6, 7 of the induction hob 2 flows through an electric current, which is generated by a resonant circuit contained in the associated electronics 4.1, 5.1, 6.1, 7.1.
• the pots 9, 10 each have a bottom made of a ferromagnetic material, in which the magnetic alternating field generated by the respective coil 4, 5, 6, 7 produces Wrbelströme which are converted by the pot or pot bottom 9, 10 in heat, to heat the food in the pot 9, 10 located.
• thermal insulation panel 1 1, 12 In order to protect the worktop 3 from the heat generated by the pot 9, 10, between the worktop 3 and the pots 9, 10 each have a thermal insulation panel 1 1, 12 arranged, as shown in Fig. 1.
• the thermal insulation material is z. B. largely of amorphous silica, which forms pores and structures with a diameter of a few nanometers in the foamed state (eg Nanogel® material).
• a heat-insulating panel 1 1, 12 has a very low thermal conductivity, so that the heat radiated by the pot 9, 10 can not pass through on the worktop 3.
• this thermal insulation panels 1 1, 12 the worktop 3 is protected from heating.
• Coil in particular copper coil
• Coil in particular copper coil
• Coil in particular copper coil
• Coil in particular copper coil

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• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Cookers (AREA)
• Induction Heating Cooking Devices (AREA)

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• 2011
  • 2011-01-21 DE DE201110000278 patent/DE102011000278A1/de not_active Withdrawn
• 2012
  • 2012-01-23 WO PCT/EP2012/050987 patent/WO2012098262A1/fr not_active Ceased
  • 2012-01-23 EP EP12708720.3A patent/EP2666335A1/fr not_active Withdrawn

Non-Patent Citations (1)

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