EP4151908A1 - Dispositif de chauffage pour une plaque de cuisson et plaque de cuisson dotée d'un tel dispositif de chauffage - Google Patents

Dispositif de chauffage pour une plaque de cuisson et plaque de cuisson dotée d'un tel dispositif de chauffage Download PDF

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Publication number
EP4151908A1
EP4151908A1 EP22191507.7A EP22191507A EP4151908A1 EP 4151908 A1 EP4151908 A1 EP 4151908A1 EP 22191507 A EP22191507 A EP 22191507A EP 4151908 A1 EP4151908 A1 EP 4151908A1
Authority
EP
European Patent Office
Prior art keywords
switching
contact
arm
carrier
heating device
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.)
Pending
Application number
EP22191507.7A
Other languages
German (de)
English (en)
Inventor
Matthias Mandl
Martin Roth
Kay Schmidt
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau GmbH
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 EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Publication of EP4151908A1 publication Critical patent/EP4151908A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/104—Arrangements of connectors, grounding, supply wires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/105—Constructive details concerning the regulation of the temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/106—Tops, e.g. hot plates; Rings electrically heated electric circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • F24C7/083—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination on tops, hot plates
    • 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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H05B1/0213—Switches using bimetallic elements

Definitions

  • the invention relates to a heating device for a hob and a hob with such a heating device, the heating device preferably being a warming heater.
  • the invention is based on the object of creating a heating device as mentioned at the outset and a hob provided with such a heating device, with which problems of the prior art can be solved and in particular it is possible to create a practical and easy-to-install heating device that is preferably produced inexpensively can be.
  • the heating device is designed for use in a hob and has a flat or planar support, the support having a heating conductor side and an opposite rear side. Furthermore, it has at least one heating conductor on the heating conductor side and a switching device, the switching device having a movable switching contact and a counter-contact assigned to this switching contact.
  • the shifting device has a shifting arm which can be moved or is movable in itself and which is preferably deformed or can bend as a result of the thermal effect. For example, it can form a warm display or the usual hot display for the heating device on the hob, so that an operator It is pointed out that the hob is hot or dangerous at the point of heating.
  • the switching arm supports the switching contact and is electrically connected to an electrical arm connection means, the switching arm being fixed to the carrier. In particular, it is attached to the carrier with an end area.
  • the mating contact is electrically connected to an electrical mating connection means, preferably it is also attached to the carrier.
  • the switching arm has a bimetallic strip or is formed from a bimetallic strip. Switching arm, switching contact and counter-contact are designed and arranged such that when a structurally specified switching temperature is exceeded, the switching contact and counter-contact are either separated by moving the switching arm due to increasing heating or are brought together to trigger a switching process. This switching process serves to signal the heating to an operator or in general, for example by means of a conventional hot indicator. Due to cooling, the switching arm then moves in the opposite direction for a complementary switching process, which reverses the signaling.
  • the switching arm is made of a bimetal, it is advantageously not designed as a snap switch.
  • the switching arm is particularly advantageously designed without a snap function. So it can be designed simpler and cheaper as well as more robust and less error-prone. Due to the low currents to be switched, a particularly fast switching process is also not required, neither when closing a contact nor when opening it.
  • the switching contact is arranged on a free end of the switching arm, in particular it is arranged on a side of the switching arm which points towards the carrier.
  • the switching arm can advantageously be flat. So it can be particularly easy to move.
  • the switching arm is preferably a bimetallic strip and consists of straight sections and/or sections which are bent at a maximum of 45° or are bent by a maximum of 45°.
  • the change in course can either be continuous due to the bend or be sharp or angled at an edge. So he can be easily trained.
  • the switching arm can consist of two straight sections that are connected to one another at an angle. Due to the angling, a precise shape and a change in shape that can be precisely predetermined can be set.
  • the switching arm is in turn a bimetallic strip and consists of straight sections and/or consists of sections that are between 15° and are angled at 90° to one another or bent accordingly. This means that adjacent sections each have a corresponding angle to one another.
  • the shifting arm can advantageously consist of exactly or at least three sections, in particular three straight sections. These can be a fastening section for fastening to the heating device, a central section and a switching contact section which is in turn connected thereto and carries the switching contact. An aforementioned angle can be provided between these three sections. In particular, it can be provided that the fastening section and the switching contact section run parallel to one another, ie they are offset parallel to one another or the switching arm has a type of Z shape.
  • the fastening section and the switching contact section can be longer than the central section, advantageously twice to ten times as long as the central section.
  • the switching arm can be slightly bent at the attachment section for attachment to the heating device or angled at a small angle to a first section of the middle section.
  • the shifter arm may have a center section angled in on itself, preferably with two sections of the center section. These two sections can be angled at a relatively small angle to one another, advantageously between 1° and 20° or between 5° and 12°. This allows the attachment portion to lie flat and parallel to the bracket and be attached.
  • the first section of the middle section which is directly connected to the fastening section, raises the shifting arm slightly above the carrier, but advantageously not too far, so that the shifting arm is still strongly heated by the carrier.
  • a second section of the middle section is angled relatively sharply in relation to the first section, for example by the aforementioned angle of between 15° and 90° or between 40° and 50°.
  • This second section is preferably shorter than the first, in particular approximately as long as in the previously explained configurations.
  • the switch contact section or a free end with the switch contact which is advantageously angled in such a way that it runs parallel to the first section of the middle section.
  • the more strongly angled second section of the middle section and thus also the switching contact section is higher above the fastening level of the switching arm.
  • a curved design of the switching arm advantageously consists of a continuous bend which runs over at least a portion of its length. It is thus possible to fasten the switching arm at one end with a flat side on the carrier.
  • the angling or bending makes it possible for the switching arm to run over the carrier and thus also to run at a distance over the mating contact. Due to warming Due to the heating conductor and the bimetallic properties, the switching arm bends with increasing temperature and can move the switching contact to the counter contact or press against it from a predetermined switching temperature and thus trigger the switching process. In the cold state or at room temperature, the switching contact is then at a distance from the mating contact, and in the hot state it is in contact with this.
  • the switching arm can be straight when it is mounted on the carrier. It can rest with the switching contact on the mating contact with a precisely defined preload, for which purpose it is pre-bent. When heated, the switching arm bends or the switching contact then moves away from the counter-contact above a predetermined switching temperature. In the hot state, the switching contact is then at a distance from the mating contact, but in the cold state or at room temperature it is in contact with this. The switching process is then exactly the opposite of what it was before. There are two options. The switching temperature can be selected in such a way that a temperature of between 50°C and 90°C prevails on a hob plate above the heating device.
  • the shifting arm has a fastening section which, in particular, has a length of between 10% and 30% of the total length of the shifting arm. It is therefore relatively short, but advantageously has no other function than fastening the shifting arm.
  • the length of the rest of the switching arm can preferably be movable and thus deform, in particular due to the bimetallic effect.
  • the switching contact can be arranged on a free end area of the switching arm, advantageously just before the end. It should be located on the side of the shifter arm that faces the wearer, i.e. on the underside.
  • the switching contact can advantageously have a protruding edge or cutting edge in order to form a line contact when it rests against a surface, in which case the edge or cutting edge can advantageously run in a longitudinal direction of the switching arm. In this way it can be ensured that the switching contact actually makes an electrical contact when it is in contact with the counter-contact, regardless of the deflection of the switching arm or its free end.
  • the switching arm can be fastened immovably to the carrier together with the arm connection means, so that an electrical connection to the switching arm is direct or goes directly to it.
  • an aforesaid fastening section can be provided, which can be connected to the arm connection means or can bear against it.
  • the switching arm can advantageously be riveted to the carrier, which is a permanent and secure connection.
  • a form-fitting connection of the switching arm to the carrier or to the electrical arm connection means can be provided on the fastening section, with a holding projection and a holding recess being particularly advantageously provided for this form-fitting connection.
  • the form-fitting connection should be able to prevent twisting of a switch arm that is fixed or rotatable at one point, so that its switch contact always rests against the intended counter-contact when it is moved due to heating.
  • the retaining projection is preferably provided on the fastening section, advantageously as an elongate projection, arm or nose projecting from the end of the fastening section in the same direction.
  • the holding recess can be provided on the arm connection means, preferably as a recess or hole, in which case the holding projection can be introduced or plugged in there when the switching arm is assembled.
  • the switching arm is in any case aligned exactly as desired, as a result of which a reliable electrical contact can be achieved between the switching contact and the mating contact.
  • the switching arm can be fastened resting on the switching contact, so there is still a section of the switching contact between the switching arm and the carrier.
  • the switching arm can be mounted directly adjacent to the carrier, in particular under the arm connection means.
  • the carrier should be electrically insulating or have a cover layer that forms electrical insulation.
  • the arm connection means presses the shift arm against the carrier so that it is attached thereto, advantageously with the aforesaid attachment portion.
  • This has the advantage that the switching arm is arranged and runs very close to the carrier and is thus also heated very quickly and directly, at least closer than if it were mounted on top of the arm connection means. This can shorten the switching time or the response time.
  • a configuration of the shifting arm described above is particularly suitable for this purpose, which has a middle section bent twice. In this case, it should preferably be provided that the arm connection means does not press the shifting arm onto the carrier over a length that is too great, so that the shifting arm can also move freely with the middle section.
  • the switching arm can be in the form of strips and/or have an elongated rectangular shape, in particular can be designed with the same width as desired. Its length can be at least 2 times greater than its width, preferably at least 3 or 5 times greater than its width. This applies in particular to the area of the switching arm which can move or which is not attached to the carrier, which means that it is, so to speak, non-deformable or immovable. These dimensions are therefore advantageous for the area of the switching arm, which can deform due to temperature changes and at least move with the switching contact.
  • the width and/or a thickness of the switching arm can remain the same.
  • the switching arm can be designed in such a way that it has no incisions and/or interruptions in the outer shape, ie has a closed outer contour. So it can be designed very simply.
  • such a deformation can be as uniform as possible, so that the shifting arm deforms and moves evenly for a defined shifting behavior. In this way, the switching process can advantageously take place at a predetermined temperature.
  • the counter-contact is arranged in a fixed and immovable manner on the heating device, in particular it rests directly or indirectly on the carrier. Then the formation of the heating device is very simple.
  • the mating contact can thus advantageously be fastened to the carrier together with the mating connection means, which is in particular a plug connection or a plug connection lug. Similar to the shift arm, it can be attached by riveting.
  • the counter-contact is part of the counter-connection means or a rivet for riveting. According to a first possibility, such a rivet can form the counter-contact, so that it serves as a contact for the switching contact in addition to its fastening function.
  • the mating contact can be connected to a mating connection means or to be attached to the carrier together with a mating connection means. In this way, attachment and electrical contact can in turn be combined.
  • the mating contact can be formed by the mating connection means itself. In this case, an elevation or a type of rib can protrude from the counter-connection means and form the counter-contact, in particular protrude in the direction away from the carrier or towards the switching contact.
  • the counter-contact is movably or is movably arranged on the carrier, in particular arranged on a counter-contact arm which is fastened to the carrier.
  • the counter-contact arm can be designed to be deformable or resilient in such a way that it yields in this direction, i.e. can move or deform, with increasing force with which the switching arm presses the switching contact against the counter-contact and thus against the counter-contact arm as the temperature increases. This allows the counter contact to move, i.e. away from the switching contact or its pressure. Preferably, it can yield or move in a direction towards the wearer.
  • the switching arm can preferably rest directly on the carrier and be fastened to the carrier together with the arm connection means placed thereon.
  • the arm connection means and underneath the switching arm can be riveted to the carrier.
  • the switching arm is arranged relatively close to the carrier and can thus be heated quickly and directly by it, which is advantageous for rapid switching.
  • the contact of the shift arm directly on the carrier or a covering layer provided thereon can also reduce or prevent twisting of the shifting arm, for example around a rivet for attachment.
  • the carrier can be electrically insulated or have electrically insulating material, in particular it can have mica or mica.
  • the carrier can consist of at least 90% or even all of mica or mica.
  • the at least one heating conductor can be applied permanently and inseparably to the carrier, in particular it can be applied as a layer. It can preferably be printed on as a thick-film heating conductor.
  • the heating conductor can lead to a contact pad that is applied to the carrier, with the switching device preferably also being able to be connected to at least one contact pad.
  • the switching device preferably also being able to be connected to at least one contact pad.
  • two free ends of the heating conductor can each go to a contact pad, with the two contact pads being able to have a distance from one another of between 1 cm and 10 cm.
  • the switching device can be arranged outside of a heating area covered by the at least one heating conductor; it can preferably be arranged between the heating conductor and an outer edge of the carrier. In particular, it can be arranged between an outermost heating conductor and an outer edge of the carrier.
  • the distance means that the switching device is not so close to the heating conductors, i.e. it is not heated up too much or too quickly.
  • the switching device can run over at least one heating conductor, i.e. above it, so that at least one heating conductor runs between the mating contact on the carrier and the attachment of the switching arm on the carrier, specifically below the switching arm.
  • the switching arm can run directly over at least one heating conductor or over two heating conductors.
  • the switching device can then be actuated very quickly, so that a hot indicator switched by it is activated very quickly and can thus warn an operator.
  • the switching device is advantageously arranged between a central area and an outer edge of the carrier, particularly advantageously closer to the outer edge than to the central area.
  • a hob according to the invention has a heating device as described above, the hob having a hob plate with an upper side and an underside and the heating device being arranged with the rear side facing the underside of the hob plate, in particular being placed against the underside of the hob plate.
  • the hob has a hot indicator device with a light source, wherein the light source can be switched on and off by the switching device and is connected to the switching device for this purpose. This takes place at a certain aforementioned temperature.
  • a current for such a hot indicator can be low, so the demands on the switching device are not very high.
  • the light source can advantageously be a glow lamp or an LED. Glow lamps have the advantage that they are very temperature-resistant, so they can also be arranged under a hob plate.
  • a heating device 11 according to the invention is shown obliquely from below.
  • the heating device 11 is designed as a so-called warming heater, as is known per se from the prior art and will also be explained in more detail below. She will, as in 7 is shown, applied to a hob plate from below and can keep a pot T placed above it, including its contents, warm.
  • the heating device 11 has a planar and flat or planar carrier 12 which advantageously consists of electrically insulating material.
  • This is particularly advantageous mica or mica.
  • it can be made of ceramic.
  • it can be made of metal, for example steel, and be electrically insulated on one side 14 of the heating conductor, for example by means of an electrically insulating coating.
  • a design made of mica or mica is considered advantageous since the material and processing costs required for this are low.
  • heating conductors 22 shown in dashed lines run in different forms, as in FIG 2 is also shown in more detail. These cannot be seen here because they are covered by a cover layer 16, which can advantageously consist of mica, similar to the carrier 12.
  • This cover layer 16 forms electrical insulation, so that spacers 28, for example, can be attached thereto as metal springs by riveting. These spacers 28 are known per se, it is on 7 referred.
  • a connection area 18 is provided on the side of the carrier 12, on which the cover layer 16 is cut out, so to speak.
  • two plug-in connections 20a and 20b are provided, which are connected to the heating conductors 22 or the heating conductors 22 emanate from these.
  • the plug-in connections 20a and 20b can be placed on contact pads at the end of the heating conductor 22 and mechanically fastened by riveting and electrically connected to them.
  • a switching device 30 is arranged in the connection area 18 and near the outer edge, so that it takes up as little space as possible on the heating conductor side 14 and at the same time has the greatest possible distance from the heating conductors 22, in particular for the aforementioned thermal reasons.
  • the switching device is then heated as late or as little as possible by the heating conductors 22, as has been described above as one embodiment.
  • the switching device 30 mainly has a switching arm 32 which is elongated and straight and very simple. He is subsequently in the 3 ff. described in more detail.
  • the switching arm 32 is fastened to the carrier 12 with a fastening section 34 together with an arm plug connection 45 by means of a rivet 44 .
  • the fastening section 34 or the switching arm 32 and the arm plug connection 45 are electrically connected to one another.
  • a mating plug-in connection 50 is fastened to the carrier 12 with a rivet 48 as a mating contact.
  • the upper rivet head 47 forms the explicit mating contact for a switching contact 42 of the switching arm 32. Otherwise, the switching device 30 or the switching arm 32 and the plug-in connections 45 and 50 are not electrically connected to anything else, in particular to nothing on the carrier 12 on the heating device 11 .
  • a heating device 111 is shown, but without the cover layer 1 , which should advantageously be made of mica as previously described.
  • a plug-in connection 120a is arranged on the left, from which an arcuate contact track 121a branches off to the left. From this contact track 121a, three heating conductors 122 of different designs and different shapes and widths extend. They each form a circuit counterclockwise and end at a right-hand arcuate contact track 121b, which is connected to a right-hand plug connector 120b. This is how the electrical contact is made to the heating conductors 122.
  • the switching device 130 is deliberately arranged in such a way that it covers at least the innermost path of the heating conductors 122. Included the two heating conductors 122 run under the switching arm 132 so that they heat the switching device 130 directly. The switching device 130 above the heating conductor 122 can therefore switch particularly quickly here because it is heated very quickly and directly.
  • the arm plug-in connection 145 and the mating plug-in connection 150 are either separated by an insulating layer, and are sometimes attached directly above the heating conductor 122 . Alternatively, they are fixed in areas left free by the heating conductors 122, in any case they should be electrically separated from them. Otherwise, the structure of the switching device 132 is exactly as before 1 described. In the case of 2 the switching device 130 will of course heat up much faster and reach a higher end temperature than in the case of the 1 , which is why the configuration of the switching device 30 should be somewhat different. Alternatively, it simply speaks much faster.
  • the switching arm 32 In the 3 is shown in enlargement of the switching arm 32 in side view. It has a fastening section 34 on the left, which is connected to the free part 39 by means of a bend 37 . In the cold state or at room temperature, there is an angle of about 10° here, and the free part 39 is exactly straight.
  • the switching arm 32 is formed of a bimetal, with an upper layer, the in 1 points away from the heating conductor side 14, is formed from the metal with the larger coefficient of thermal expansion. The layer applied below has the lower coefficient of thermal expansion. Thus, the switching arm 32 bends as it heats up, as shown in figure 5 is shown, down.
  • a hole 35 is attached, which from the 4 can be seen. So for arranging the figure 5 a rivet 44 can be pushed through, with the downwardly angled part of the arm plug connection 45 having a corresponding hole being placed first on the heating conductor side 14 of the carrier 12 at the top. The switching arm 32 with the fastening section 34 is then placed on it, and then the rivet 44 is used for riveting Attachment portion 34 is connected and also electrically connected.
  • the free part 39 has a constant width and also a constant thickness, like the rest of the entire switching arm 32.
  • the free part 39 has a switching contact 42 at the bottom. This is advantageously designed as a blade contact or has an elongate blade that runs in the longitudinal direction of the switching arm 32 . This is how switching takes place along a line. Because with the switching device 30 only a small current for a hot display has to be switched, the switching contact 42 does not need to be very complicated and/or to be provided with expensive materials.
  • the mating plug connection 50 is placed with the lower angled section on the heating conductor side 14 and then fastened by means of a rivet 48 .
  • the upper rivet head 47 of the rivet 48 forms the counter-contact on which the closed state figure 5 the switching contact 42 is present.
  • the electrical contact between the arm plug connection 45 and the mating plug connection 50 is thus closed.
  • the rivet head 47 is entirely sufficient as a counter-contact. Costs for a further separate contact or contact head can thus be saved, and this also does not have to be fixed in any other way.
  • the switching arm 32 is broken at room temperature and the switching contact 42 is clearly above the rivet head 47 as a mating contact.
  • the heating device 11 begins to heat up due to current flowing through the heating conductor 22, the switching device 30 and thus also the switching arm 32 also become warmer.
  • a maximum temperature of the heating device 11 in the area of the heating conductors 22 can be around 120° C., possibly also up to 20° C. above or below. Accordingly, there is a temperature at the switching device 30, which leads to the deformation of the bimetallic switching arm 32, which begins to bend downwards and thus to press the switching contact 42 in the direction of the rivet head 47 as a counter-contact.
  • the switching arm 32 At a certain temperature and after a certain time, for example a temperature of about 65°C at the switching arm 32 and a time of one minute, the switching arm 32 has deformed so much and bent down due to the bimetallic effect that the switching contact 42 on Rivet head 47 is applied.
  • a circuit can be closed, which either directly activates a lamp for said hot display or is used in a controller, in particular a microprocessor, as a switching signal, which is then displayed elsewhere. It is significant here that the heating device 11 itself is not influenced or switched in its heating function with the switching device 30 .
  • the temperature may possibly rise even further as the heating device 11 continues to operate, but this ultimately only leads to an even further deflection of the switching arm 32 towards the carrier 12 . Due to the concern of the switching contact 42 on the rivet head 47 as a counter-contact, however, it cannot move any further here.
  • the left attachment portion 34 is also fixed. This then leads to the switching arm 32 nevertheless being deformed even more strongly towards the carrier 12 .
  • relatively large forces can occur here under certain circumstances. These must include the switching device 30 and the carrier 12 can either endure constructively.
  • a thickness of the switching arm 32 can be between 0.1 mm and 0.5 mm, which means that it can be achieved that it carries out the movement accordingly in any case due to heating figure 5 . At the same time, however, the development of force can be limited at even higher temperatures, so that the risk of damage remains low.
  • switch arm 232 In the 6 an alternative switch arm 232 is shown. It has no bend, but here a straight fastening section 234 merges into the free part 239 in a constant bend. Also this free part 239 is not straight but bent with the same bend. It can be provided that in the cold state or at room temperature a switching contact 242 at the free end 240 of the free part 239 is just as high above a plane on which the fastening section 234 rests, as in the angled switching arm 3 . Due to the continuous bending, its very high force, with which the switching arm 232 presses against the carrier or a counter-contact at high temperature, can possibly be better absorbed.
  • dashed lines show the shape of switching arm 232 at high temperature or at a temperature at which it is likely to be in contact with its switching contact 242 against a counter-contact. This form is not much different than according to figure 5 , however, there is no mechanical weakening due to the deflection or it is necessary.
  • a hob 55 according to the invention is shown in simplified form.
  • the hob 55 has a hob plate 56, advantageously consisting of glass ceramic, with an underside 57.
  • a heating device 11 according to the invention is pressed onto this underside 57 by means of the spacers 28. Further heating devices are advantageously arranged here, but not according to the invention, but so-called radiant heating devices with a significantly higher output.
  • a pot T is set up above the heating device 11 and is to be kept warm together with its contents at a temperature of approximately 60°C to 70°C.
  • the heating device 11 is connected by means of the switching device 30 to a hot indicator 60 in the form of a glow lamp. Furthermore, it is connected to a controller 59 via which power is supplied to the hot indicator 60.
  • the hot indicator 60 is always activated when the switching device 30 is closed. As long as the switching device 30 is closed, the hot indicator 60 is also activated. If the heating device 11 is deliberately switched off after a certain period of operation or by an operator, the temperature also drops again. If it falls below a certain value, the switching arm 32 of the switching device 30 bends back so far that the switching contact 42 moves away from the rivet head 47 as a counter-contact.
  • the hot indicator 60 is de-energized and disabled. An exact switching temperature can be set for this.
  • these should be set in such a way that there is a temperature of 60° C. on the top of the hob plate 56 in the area above the heating device 11 and as a result or at the same time the hot display 60 is activated to warn an operator becomes.
  • the information about the switching of the switching device 30 can also be processed in the controller 59 .
  • a switching arm 332 has a kind of Z-shape with a fastening section 334 on the far left, a middle section 336 and a free part 339. Between the fastening section 334 and middle section 336 there is a first bend 337a with approximately 60° or 120° between the two sections . A second corresponding bend 337b is provided between the middle section 336 and the free part 339, so that the fastening section 334 and the free part 339 run parallel to one another.
  • the attachment section 334 is about three times as long as the middle section 336, and the free part 339 is about six times as long as the middle section 336.
  • the free part 339 also has a switching contact 342 on its free end 340 on the underside.
  • the fastening section 334 is fastened to a carrier 312 of the heating device 311 by means of a rivet 344 together with an angled arm plug connection 345 .
  • the free end 340 with the switching contact 342 rests on a rib 351 of a mating plug connection 350 which is fastened to the carrier 312 by means of a rivet 348 .
  • the arm connector 345 and the mating connector 350 are advantageously of identical design, which reduces the number of parts required.
  • the rib 351 can be produced by stamping or bending in it and forms the previously explained counter-contact for the switch contact 342. From the side view it can be seen clearly that a movement of the switch arm 332 due to heating and the bimetallic effect causes the switch contact 342 to counter-contact the rib 351 presses.
  • a narrow, elongated retaining projection 341 protrudes in the same direction from the fastening section 334 in the manner of an arm or a nose.
  • This one is also in 8 not drawn in, but recognizable in terms of its design.
  • the holding projection 341 can be 2 mm to 5 mm long. It is inserted or plugged into a slightly larger retaining recess 346 on the arm plug connection 345, which is done before the two parts are attached to the carrier 312 by means of the rivets 344. It is clearly evident that the switching arm 332 cannot be rotated or can only be rotated slightly about its attachment to the rivet 344 by the retaining projection 341 in the retaining recess 346 .
  • a corresponding holding recess can also be seen in the mating plug connection 350 .
  • this holding recess 346 can simplify the angling of the arm plug connector 345 .
  • FIG. 11 In the 11 is shown as a switch arm 432 corresponding Figures 3 and 4 is formed, is attached to a heating device 411 or on a cover layer 416 of a carrier 412. In this case, the difference falls to figure 5 that the switching arm 432 rests directly on the cover layer 416 with a fastening section 434 .
  • An arm connector 445 is fitted from above and secured to the bracket 412 by a rivet 444 similar to that previously described.
  • a right-pointing area 452, at the end of which a rib 451 is arranged, runs above the free part 439 of the switching arm 432. In order to allow for this upward movement space, this area 452 is slightly bent upwards.
  • a mating plug-in connection 450 which has the same design as the arm plug-in connection 445 and is arranged in a mirror-inverted manner, is fastened directly to the carrier 412 or its cover layer 416 by means of a rivet 448.
  • a rib 451 is in turn provided for a switching contact 442 at the lower end of the right-hand free end 440.
  • the switching arm 432 is arranged closer to the carrier 412 and thus closer to the heat source. For this reason, the switching device 34 with the switch 432 reacts more directly or more quickly when heated, ie when the switching arm 432 is to move downwards to close the contact between the switching contact 442 and the rib 451 as a counter-contact.
  • a left first center section 536a adjoins a fastening section 534 on the extreme left.
  • the angle between the two is approximately 80°, so that the left first central section 536a is bent or angled by approximately 10° in relation to the attachment section 534 .
  • To the right the left-hand or first middle section 536a is adjoined by the right-hand second middle section 536b at an angle of approximately 50°. To the right, with a further bend of the same size of approximately 50°, it merges into the free end 540, which has a switching contact 542 on its underside.
  • the left first center section 536a and the free end 540 run approximately parallel to one another and are, so to speak, offset from one another in the manner of steps by means of the right second center section 536b. Thus, it is in the switching arm 532, so to speak, a switching arm according to 3 , which shortly before the free end 540 with a short spaced double bend corresponding to the switching arm according to FIG 8 is provided.
  • the shift arm 540 is off 12 Part of a switching device 530 on a heating device 511.
  • the switching arm 540 is placed directly on a cover layer 516 on a carrier 512 of the heating device 511. It is held in place from above by an arm connector 545 and rivet 544.
  • the arm connector 545 is designed exactly as for 11 described.
  • an identical mating plug connector 550 arranged in a mirror-inverted manner is fastened directly to the carrier 512 by means of a rivet 548 .
  • the vertical distance between the switch contact 542 and a rib 551 on the mating connector 550 is slightly less than the vertical distance of the point at the bend between the left middle section 536a and the right middle section 536b.
  • the switching contact 542 rests securely against the rib 551 before the right-hand area of the left-hand middle section 536a strikes the cover layer 516 of the carrier 512. This ensures that the switching arm 532 can be bent downwards until the contacts 542 and 551 close, before the switching arm 532 strikes the carrier 512 with a movable area, so to speak.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermally Actuated Switches (AREA)
EP22191507.7A 2021-09-20 2022-08-22 Dispositif de chauffage pour une plaque de cuisson et plaque de cuisson dotée d'un tel dispositif de chauffage Pending EP4151908A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021210399.5A DE102021210399A1 (de) 2021-09-20 2021-09-20 Heizeinrichtung für ein Kochfeld und Kochfeld mit einer solchen Heizeinrichtung

Publications (1)

Publication Number Publication Date
EP4151908A1 true EP4151908A1 (fr) 2023-03-22

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ID=83005911

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Application Number Title Priority Date Filing Date
EP22191507.7A Pending EP4151908A1 (fr) 2021-09-20 2022-08-22 Dispositif de chauffage pour une plaque de cuisson et plaque de cuisson dotée d'un tel dispositif de chauffage

Country Status (3)

Country Link
US (1) US12372248B2 (fr)
EP (1) EP4151908A1 (fr)
DE (1) DE102021210399A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116753737B (zh) * 2023-06-20 2025-08-22 新余钢铁股份有限公司 一种高温电加热装置

Citations (11)

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Publication number Priority date Publication date Assignee Title
CH204195A (de) * 1938-08-10 1939-04-30 Therma Ag Temperaturregleranordnung an elektrischen Kochplatten.
DE854592C (de) * 1950-06-11 1952-11-06 Siemens Ag Elektrischer Temperaturregler
US2944135A (en) * 1959-01-23 1960-07-05 Westinghouse Electric Corp Control for flashing electric heaters
US3209106A (en) * 1961-02-24 1965-09-28 Pace Inc Thermoresponsive switch for electrically energizable surface heater
JPS50124143U (fr) * 1974-03-26 1975-10-11
EP0045007A1 (fr) * 1980-07-24 1982-02-03 Karl Fischer Plaque de cuisson électrique munie d'un disjoncteur thermique
EP0219675A1 (fr) * 1985-10-05 1987-04-29 Braun Aktiengesellschaft Plaque de chauffage, en particulier pour machine à café électrique
DE19638517A1 (de) * 1996-09-20 1998-03-26 Ako Werke Gmbh & Co Strahlungsheizkörper für eine Kochstelle
DE19803507A1 (de) * 1998-01-30 1999-08-05 Ego Elektro Geraetebau Gmbh Abschalteinrichtung für einen beheizbaren Behälter
US20130146585A1 (en) 2011-12-09 2013-06-13 E.G.O. Elektro-Geratebau Gmbh Control Device for an Electrical Heating Device for a Cooking Field, Cooking Field and Method for Operating Such an Electrical Heating Device
CA3010966A1 (fr) * 2017-12-05 2019-06-05 Zhejiang Jiu Kang Electric Appliances Co., Ltd. Un appareil de cuisson vitroceramique et une methode portant sur le controle de limitation de temperature en vue de prevenir l'allumage d'huile de cuisson

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Publication number Priority date Publication date Assignee Title
US1924647A (en) 1931-02-14 1933-08-29 Service Station Equipment Comp Thermostat
US3092323A (en) * 1959-09-11 1963-06-04 Robertshaw Fulton Controls Co Burner fuel control system
GB2389504B (en) * 2002-06-07 2005-06-08 Ceramaspeed Ltd Electrical food warming apparatus
ES1057791Y (es) * 2004-06-14 2005-01-01 Eika S Coop Calefactor radiante en una encimera de coccion, con un interruptor termico.
US7345569B2 (en) 2005-05-03 2008-03-18 Tsung-Mou Yu Temperature sensitive protection device for circuits

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH204195A (de) * 1938-08-10 1939-04-30 Therma Ag Temperaturregleranordnung an elektrischen Kochplatten.
DE854592C (de) * 1950-06-11 1952-11-06 Siemens Ag Elektrischer Temperaturregler
US2944135A (en) * 1959-01-23 1960-07-05 Westinghouse Electric Corp Control for flashing electric heaters
US3209106A (en) * 1961-02-24 1965-09-28 Pace Inc Thermoresponsive switch for electrically energizable surface heater
JPS50124143U (fr) * 1974-03-26 1975-10-11
EP0045007A1 (fr) * 1980-07-24 1982-02-03 Karl Fischer Plaque de cuisson électrique munie d'un disjoncteur thermique
EP0219675A1 (fr) * 1985-10-05 1987-04-29 Braun Aktiengesellschaft Plaque de chauffage, en particulier pour machine à café électrique
DE19638517A1 (de) * 1996-09-20 1998-03-26 Ako Werke Gmbh & Co Strahlungsheizkörper für eine Kochstelle
DE19803507A1 (de) * 1998-01-30 1999-08-05 Ego Elektro Geraetebau Gmbh Abschalteinrichtung für einen beheizbaren Behälter
US20130146585A1 (en) 2011-12-09 2013-06-13 E.G.O. Elektro-Geratebau Gmbh Control Device for an Electrical Heating Device for a Cooking Field, Cooking Field and Method for Operating Such an Electrical Heating Device
CA3010966A1 (fr) * 2017-12-05 2019-06-05 Zhejiang Jiu Kang Electric Appliances Co., Ltd. Un appareil de cuisson vitroceramique et une methode portant sur le controle de limitation de temperature en vue de prevenir l'allumage d'huile de cuisson

Also Published As

Publication number Publication date
US20230091878A1 (en) 2023-03-23
DE102021210399A1 (de) 2023-03-23
US12372248B2 (en) 2025-07-29

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