EP3334249B1 - A spacer with an induction coil of an induction hob - Google Patents

A spacer with an induction coil of an induction hob Download PDF

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Publication number
EP3334249B1
EP3334249B1 EP17201765.9A EP17201765A EP3334249B1 EP 3334249 B1 EP3334249 B1 EP 3334249B1 EP 17201765 A EP17201765 A EP 17201765A EP 3334249 B1 EP3334249 B1 EP 3334249B1
Authority
EP
European Patent Office
Prior art keywords
spacer
induction coil
cover plate
induction
leg
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17201765.9A
Other languages
German (de)
French (fr)
Other versions
EP3334249A1 (en
Inventor
Marko Kreca
Benjamin KLAUZAR
Gregor MLINARIC
Milan VIVOD
Drazen DJUKIC
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gorenje gospodinjski aparati dd
Original Assignee
Gorenje gospodinjski aparati dd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gorenje gospodinjski aparati dd filed Critical Gorenje gospodinjski aparati dd
Priority to PL17201765T priority Critical patent/PL3334249T3/en
Publication of EP3334249A1 publication Critical patent/EP3334249A1/en
Application granted granted Critical
Publication of EP3334249B1 publication Critical patent/EP3334249B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
    • H05B6/1263—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements using coil cooling arrangements
    • 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
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/02—Induction heating
    • H05B2206/022—Special supports for the induction coils
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the present invention relates to an induction hob comprising an induction coil and spacers to enable an air gap between the induction coil and a cover plate, and in particular the invention refers to a spacer with said induction coil.
  • the induction coil is provided with a probe which triggers power reduction of the induction coil when to high temperature is detected.
  • Said element for transfer heat to the temperature probe must be reliably mounted between the thermal insulation and the electrical insulator under the glass in order to ensure an appropriate container temperature measurement.
  • Measurement of the temperature on the induction coil is carried out by means of a probe arranged inside induction coil. Wool insulation, or spacers for providing an air gap between the induction coil and a glass cover plate, or any other suitable thermal insulation material is used as an excess temperature protection.
  • wool insulation is used exclusively as a thermal protection which supposed to ensure an accurate arrangement of the element for heat transfer. In case that said element for heat transfer is displaced, heat transfer to the temperature probe can decrease resulting in irregular reading of temperature.
  • a carrier for an induction coil has been disclosed in a patent application No. EP 1 686 836 A1 .
  • pacers located in an insulation layer positioned between the glass cover plate and the induction coil.
  • the spacer can be adhered to the bottom side of said glass or to the insulation layer.
  • spacers as disclosed serve also to maintain a distance between windings of the coil in the gap between the insulating layers.
  • disclosed spacer can not be used to cooperate with a temperature probe in order to sense the temperature of the induction hob.
  • a spacer according to the invention also provides for a proper mounting of an element for transfer heat to a temperature probe.
  • the spacer for heat transfer reliably and properly rests against both the induction coil and the glass cover plate with no possibility, whatsoever, to slip out of the position thereof.
  • Induction hob comprises a cover plate 1, preferably a glass or glass ceramic plate or a plate of other suitable material, having a cooking surface 2 for receiving a container with a medium to be heated, and at least one inductor 3 provided for heating said medium arranged under the cover plate 1 in each section under the cooking area.
  • Said inductor 3 is via an electrical insulation means 4 in close connection with a lower surface 5 of the cover plate 1, so that the distance between the inductor 3 and the container with the medium to be heated is smallest possible.
  • Said inductor 3 comprises an induction coil 6 which is arranged, spaced from the cover plate 1 and, respectively, from said insulation means 4, on the underside of the cover plate 1.
  • Said spacing provided by at least one spacer 7, preferably with a plurality of spacers 7, provides an appropriate air gap t between the induction coil 6 and the cover plate 1 and, respectively, said insulation means 4.
  • the air gap t acts as a thermal insulator.
  • Said spacers 7 are preferably equally spaced arranged over the circumference of the induction coil 6, particularly in a preferred way, that each spacer 7 extends approximately from the central region of the induction coil 6 towards the outside border thereof.
  • a plurality of guiding elements for magnetic flux 8 preferably made on the basis of ferrites.
  • the induction coil 6 is fed by energy via connectors 9.
  • a temperature probe 10 which sends via a line 11 information about temperature conditions in the inductor.
  • the temperature probe 10 senses temperature only locally in a single point.
  • an element 12 for heat transfer from the container with medium to be heated to the temperature probe 10 is associated with the temperature probe 10, preferably in the region between the insulation means 4 and the induction coil 6.
  • Said element 12 for heat transfer is formed as a one-leg or a multi-leg element, for example, the legs 13 thereof are arranged in the plane of the induction coil 6.
  • Each leg 13 of the element 12 for heat transfer cooperates with the spacer 7 which presses said leg 13 towards the cover plate 1 and, respectively, towards said insulation means 4.
  • the element 12 for heat transfer must rests precisely and reliably against the temperature probe 10 as well as against the cover plate 1 and, respectively, against said insulation means 4, thus, enabling reliable, repeatable and accurate reading of the temperature.
  • the element 12 for heat transfer must be unmoveably fixed in the inductor.
  • Said fixed position of the element 12 for heat transfer is realized with said at least one spacer 7.
  • the spacer 7 is formed either at its surface which cooperates with the cover plate 1 and, respectively, with said insulation means 4, and/or its surface which cooperates with the induction coil 6, with at least one groove 14 provided to accommodate said leg 13 of the element 12 for heat transfer.
  • Said groove 14 extends at least over a part of the length of the spacer 7. The depth of said groove 14 essentially equals the thickness of the leg 13.
  • the spacer 7 can be made either of resilient material or of stiff material. With the preferred embodiment is provided that the spacer 7 is made of synthetic resilient material, particularly preferably of temperature resistant resilient material such as of silicon rubber for example. The elasticity of the spacer 7 enables for the leg 13 of the element 12 for heat transfer located in the groove 14 to tightly rest against the cover plate 1 and, respectively, against the insulation means 4. When the spacer 7 is made of stiff material, resting of the element 12 for heat transfer against the lower surface 5 of the cover plate 1 and, respectively against the electrical insulation means 4 can be achieved by additional elastic means.
  • each spacer 7 is associated by means of an adhesion means and/or by means of a mechanical means with the insulation means 4 and/or with the induction coil 6.

Landscapes

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

Description

  • The present invention relates to an induction hob comprising an induction coil and spacers to enable an air gap between the induction coil and a cover plate, and in particular the invention refers to a spacer with said induction coil.
  • Care has to be taken of an appropriate thermal protection of induction coils in order for an induction hob to operate regularly and properly. Due to a need of an accurate control of heated container and, respectively, of medium in the container, an element for transfer heat to a temperature probe is used. The hot container heated up by means of said induction coil transfers part of the heat to the induction cover plate, whereby heat is transferred through the glass directly to the induction coil. The induction coil already warms up due to the operation thereof, however, with additional heat supply from the container with the medium to be heated onto the induction coil the latter can be overheated resulting in shorten lifespan and even a destruction. In order to prevent to high temperature to occur on the induction coil, the induction coil is provided with a probe which triggers power reduction of the induction coil when to high temperature is detected. Said element for transfer heat to the temperature probe must be reliably mounted between the thermal insulation and the electrical insulator under the glass in order to ensure an appropriate container temperature measurement.
  • Measurement of the temperature on the induction coil is carried out by means of a probe arranged inside induction coil. Wool insulation, or spacers for providing an air gap between the induction coil and a glass cover plate, or any other suitable thermal insulation material is used as an excess temperature protection. When the temperature is measured by means of the element for transferring heat to the temperature probe, wool insulation is used exclusively as a thermal protection which supposed to ensure an accurate arrangement of the element for heat transfer. In case that said element for heat transfer is displaced, heat transfer to the temperature probe can decrease resulting in irregular reading of temperature.
  • A carrier for an induction coil has been disclosed in a patent application No. EP 1 686 836 A1 . Disclosed are pacers located in an insulation layer positioned between the glass cover plate and the induction coil. Alternatively, the spacer can be adhered to the bottom side of said glass or to the insulation layer. In addition, spacers as disclosed serve also to maintain a distance between windings of the coil in the gap between the insulating layers. However, disclosed spacer can not be used to cooperate with a temperature probe in order to sense the temperature of the induction hob.
  • It is the object of the present invention to create a spacer with an induction coil of an induction hob, which remedies drawbacks of the known solutions.
  • The object as set forth is solved, according to the present invention, by features disclosed in the characterising part of claim 1. Detail of the invention is disclosed in respective sub-claims. In addition to providing an air gap between an induction coil and a glass cover plate, which enables an appropriate thermal protection, a spacer according to the invention also provides for a proper mounting of an element for transfer heat to a temperature probe. The spacer for heat transfer reliably and properly rests against both the induction coil and the glass cover plate with no possibility, whatsoever, to slip out of the position thereof. By means of reliable contact of the spacer and the glass cover plate there is ensured an accurate reading of the temperature of a container with medium to be heated and, as a result, a reliable contact of the element for heat transfer with the temperature probe.
  • The invention is further described in detail by way of non-limiting embodiment, and with a reference to the accompanying drawings, where
    • Fig. 1
    shows a partial three-dimensional schematic view of an induction hob from below,
    Fig. 2
    shows a three-dimensional schematic side view of an inductor of the induction hob of Fig. 1.
  • Induction hob comprises a cover plate 1, preferably a glass or glass ceramic plate or a plate of other suitable material, having a cooking surface 2 for receiving a container with a medium to be heated, and at least one inductor 3 provided for heating said medium arranged under the cover plate 1 in each section under the cooking area. Said inductor 3 is via an electrical insulation means 4 in close connection with a lower surface 5 of the cover plate 1, so that the distance between the inductor 3 and the container with the medium to be heated is smallest possible.
  • Said inductor 3 comprises an induction coil 6 which is arranged, spaced from the cover plate 1 and, respectively, from said insulation means 4, on the underside of the cover plate 1. Said spacing provided by at least one spacer 7, preferably with a plurality of spacers 7, provides an appropriate air gap t between the induction coil 6 and the cover plate 1 and, respectively, said insulation means 4. The air gap t acts as a thermal insulator. Said spacers 7 are preferably equally spaced arranged over the circumference of the induction coil 6, particularly in a preferred way, that each spacer 7 extends approximately from the central region of the induction coil 6 towards the outside border thereof.
  • Directly under the induction coil 6 and, optionally, with an intermediate electrical insulation means is arranged a plurality of guiding elements for magnetic flux 8 preferably made on the basis of ferrites. The induction coil 6 is fed by energy via connectors 9. In the central region of the induction coil 6 is arranged a temperature probe 10 which sends via a line 11 information about temperature conditions in the inductor. However, the temperature probe 10 senses temperature only locally in a single point. In order to increase the temperature sensing surface it is provided for that an element 12 for heat transfer from the container with medium to be heated to the temperature probe 10 is associated with the temperature probe 10, preferably in the region between the insulation means 4 and the induction coil 6. Said element 12 for heat transfer is formed as a one-leg or a multi-leg element, for example, the legs 13 thereof are arranged in the plane of the induction coil 6. Each leg 13 of the element 12 for heat transfer cooperates with the spacer 7 which presses said leg 13 towards the cover plate 1 and, respectively, towards said insulation means 4.
  • The element 12 for heat transfer must rests precisely and reliably against the temperature probe 10 as well as against the cover plate 1 and, respectively, against said insulation means 4, thus, enabling reliable, repeatable and accurate reading of the temperature. To this extent, the element 12 for heat transfer must be unmoveably fixed in the inductor. Said fixed position of the element 12 for heat transfer is realized with said at least one spacer 7. To this extent, the spacer 7 is formed either at its surface which cooperates with the cover plate 1 and, respectively, with said insulation means 4, and/or its surface which cooperates with the induction coil 6, with at least one groove 14 provided to accommodate said leg 13 of the element 12 for heat transfer. Said groove 14 extends at least over a part of the length of the spacer 7. The depth of said groove 14 essentially equals the thickness of the leg 13.
  • The spacer 7 can be made either of resilient material or of stiff material. With the preferred embodiment is provided that the spacer 7 is made of synthetic resilient material, particularly preferably of temperature resistant resilient material such as of silicon rubber for example. The elasticity of the spacer 7 enables for the leg 13 of the element 12 for heat transfer located in the groove 14 to tightly rest against the cover plate 1 and, respectively, against the insulation means 4. When the spacer 7 is made of stiff material, resting of the element 12 for heat transfer against the lower surface 5 of the cover plate 1 and, respectively against the electrical insulation means 4 can be achieved by additional elastic means.
  • Furthermore, it is provided according to the present invention that said insulation means 4 is associated by means of an adhesion means with the lower surface 5 of the cover plate 1. Still further is provided that each spacer 7 is associated by means of an adhesion means and/or by means of a mechanical means with the insulation means 4 and/or with the induction coil 6.

Claims (7)

  1. An induction hob comprising a cover plate (1) with an inductor, said inductor comprised of an induction coil (6), spacers (7) for enabling an air gap between the induction coil (6) and the cover plate (1), and a temperature probe (10), characterized in that a spacer (7) comprises,
    either at its side that cooperates with a cover plate (1) and, respectively, with an electrical insulation means (4) by means of which an inductor (3) is tightly connected to the lower surface (5) of the cover plate (1), and/or at its side that cooperates with an induction coil (6) which is arranged with a spacing (t) from the cover plate (1) and, respectively, from said insulation means (4),
    wherein a temperature probe (10) is arranged in the central region of the induction coil (6) to which is connected an element (12) for transfer of heat from a container with medium to be heated,
    wherein said element (12) for heat transfer is formed as an element comprising one or several legs (13),
    at least one groove (14) configured to accommodate the leg (13) of the element (12) which is connected to a temperature probe (10) arranged in the central region of the induction coil (6).
  2. An induction hob according to claim 1, characterized in that each leg (13) of the element (12) for heat transfer cooperates with the spacer (7) which presses said leg (13) against the cover plate (1) and, respectively, against said insulation means (4).
  3. An induction hob according to claim 1, characterized in that said groove extends (14) at least over a part of the length of the spacer (7), wherein the depth of said groove (14) essentially equals the thickness of said leg (13).
  4. An induction hob according to any of the preceding claim, characterized in that the spacer (7) is made of a temperature resistant material.
  5. An induction hob according to claim 4, characterized in that the spacer (7) is made of a temperature resistant resilient or stiff material.
  6. An induction hob according to claim s 4 and 5, characterized in that the elasticity of the spacer (7) provides for the leg (13) of the element (12) for heat transfer located in the groove (14) to be tightly pressed against the cover plate (1) and, respectively, against said insulation means (4).
  7. An induction hob according to any of the preceding claim, characterized in that each spacer (7) is associated by means of an adhesion means with the insulation means (4) and/or the induction coil (6).
EP17201765.9A 2016-12-12 2017-11-15 A spacer with an induction coil of an induction hob Active EP3334249B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17201765T PL3334249T3 (en) 2016-12-12 2017-11-15 A spacer with an induction coil of an induction hob

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SI201600299A SI25336A (en) 2016-12-12 2016-12-12 The spacer element in the induction coil of the induction hob

Publications (2)

Publication Number Publication Date
EP3334249A1 EP3334249A1 (en) 2018-06-13
EP3334249B1 true EP3334249B1 (en) 2019-08-07

Family

ID=60473287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17201765.9A Active EP3334249B1 (en) 2016-12-12 2017-11-15 A spacer with an induction coil of an induction hob

Country Status (3)

Country Link
EP (1) EP3334249B1 (en)
PL (1) PL3334249T3 (en)
SI (1) SI25336A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220161026A (en) * 2021-05-28 2022-12-06 엘지전자 주식회사 Electric range

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005005526A1 (en) * 2005-01-31 2006-08-24 E.G.O. Elektro-Gerätebau GmbH Support for an induction coil, induction heater, induction hob and method of manufacturing an induction heater
ES2328546B1 (en) * 2007-04-27 2010-08-30 Bsh Electrodomesticos España, S.A. COOKING UNIT DEVICE.
EP2775785B1 (en) * 2013-03-08 2018-12-05 Electrolux Appliances Aktiebolag Induction hob

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3334249A1 (en) 2018-06-13
PL3334249T3 (en) 2019-12-31
SI25336A (en) 2018-06-29

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