EP3796751A1 - Plaque de cuisson et procédé de fonctionnement d'une plaque de cuisson - Google Patents

Plaque de cuisson et procédé de fonctionnement d'une plaque de cuisson Download PDF

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Publication number
EP3796751A1
EP3796751A1 EP20194029.3A EP20194029A EP3796751A1 EP 3796751 A1 EP3796751 A1 EP 3796751A1 EP 20194029 A EP20194029 A EP 20194029A EP 3796751 A1 EP3796751 A1 EP 3796751A1
Authority
EP
European Patent Office
Prior art keywords
hob
display device
area
temperature
thermal actuator
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.)
Granted
Application number
EP20194029.3A
Other languages
German (de)
English (en)
Other versions
EP3796751B1 (fr
Inventor
Lutz Ose
Michael Riffel
Christian Seidler
Wolfgang Thimm
Carmelo Zarcone
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 EP3796751A1 publication Critical patent/EP3796751A1/fr
Application granted granted Critical
Publication of EP3796751B1 publication Critical patent/EP3796751B1/fr
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
    • 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
    • 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
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous 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
    • 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 invention relates to a hob and a method for operating a hob, in particular an aforementioned hob.
  • Hobs which have a display device below a hob plate of the hob, a display or a touch display often being used as the display device.
  • Information about the hob or operating functions of the hob can be output to a user of the hob by means of the display or the touch display.
  • the disadvantage of the display devices, especially when using displays or touch displays with LCD or OLED displays, is their temperature sensitivity.
  • the invention is based on the object of providing a hob with a display device and a method with which problems of the prior art can be avoided and in particular it is possible to protect a display device from negative impairment or even damage due to excessively high temperatures .
  • the hob according to the invention for heating cookware has a hob plate and underneath a display device and at least one heating device.
  • the hob plate has a cooking area and a display area, the display area being different from the cooking area and the display area not having any overlap with the cooking area.
  • the display device is arranged under the hob plate within the display area and is designed to output information about the hob and / or operating functions of the hob.
  • the at least one heating device is arranged under the hob plate within the cooking area and is designed to heat the cookware.
  • the hob has at least one thermal actuator which is designed to change a distance between the hob plate and the display device as a function of a temperature within the display area or adjacent to the display area and / or on the hob plate.
  • the hob can be used to heat cookware for cooking or preparing food.
  • the heating devices can be designed as desired, advantageously as radiant heaters or induction heating coils. Adjacent to the display area can be a distance of 0.5 cm to 4 cm from the display area or from the display device, advantageously 1 cm to 2 cm.
  • the hob plate has an underside and an upper side, the upper side being opposite to the underside.
  • the top is designed for contacting and carrying cookware, the cookware being placed on top for heating.
  • the display device is preferably arranged on the underside, in particular by means of a seal or the like. pressed against the underside.
  • the hob plate can consist of a radiation-permeable material such as hard glass or conventional glass ceramic.
  • the display device can be designed with a correspondingly bright light so that the information output about the hob and / or the control functions of the hob can be recognized by an operator through the hob plate from the top of the hob plate.
  • the hob plate can be made in one piece or in several pieces. If the hob plate is constructed in several parts, the hob plate can preferably have a display plate and a hot plate, the display plate each having or forming the display area and the hot plate the cooking area. If the hob plate is made in one piece, the display area can preferably adjoin the cooking area.
  • the display area can be rectangular and have four sides, one side or three sides of the display area preferably adjoining the cooking area.
  • the cooking area is designed for the cookware that is set up within the cooking area for heating, in particular for cooking food.
  • the cooking area can preferably occupy 60% to 90% of an area of the hob plate.
  • the hob plate can have a plurality of, preferably at least partially or completely different, partial cooking areas, in particular two, three, four, five, six, seven, eight or nine partial cooking areas.
  • the display area can preferably take up 10% to 40% of the surface of the hob plate.
  • the hob plate can have a plurality of, in particular different, partial display areas, in particular two, three, four, five, six, seven, eight or nine partial display areas.
  • the display device can be an electronic component, in particular the display device can be a thermally sensitive component.
  • the display device can possibly be damaged if a temperature on the display device itself of, for example, 80 ° C. or 100 ° C. is exceeded.
  • the display device preferably has a display or a touch display, in particular a rectangular display or touch display. Such displays are often very temperature sensitive. Alternatively, it can also have only individual discrete LEDs with capacitive touch switches.
  • the touch display can be operated by an operator by touching the top of the hob plate.
  • the display device can be pressed directly from below against the hob plate or against its underside.
  • the display device can be partially covered by the hob plate, preferably it is completely covered.
  • the hob plate is therefore advantageously a cover for the display device. A large number of information and / or operating functions can be output at the same time.
  • All heating devices are completely covered by the hob plate.
  • the majority of the heating devices can be arranged adjacent to one another at a small distance, in particular almost or directly adjacent to one another.
  • the heating devices can cover more than half of the area of the hob plate, advantageously about 60% to 95%.
  • the hob can have one or advantageously several thermal actuators for the display device.
  • a thermal actuator can be designed to change a distance between the hob plate and the display device as a function of a temperature within the display area or adjacent to the display area and / or below the hob plate, in particular if the temperature becomes too high and there is a risk of damage to the display device can exist.
  • the thermal actuator can detect a temperature on or below the hob plate or on the display device, preferably in that the temperature acts on it.
  • the temperature can advantageously be detected by means of contact heat or IR radiation.
  • the thermal actuator can be designed to change the distance between the hob plate and the display device as a function of the temperature.
  • the thermal actuator can be arranged completely or partially within the display area, the thermal actuator being exposed to the temperature within the display area or on the hob plate.
  • the thermal actuator can expand or contract as a function of the temperature, with the expansion or contraction of the thermal actuator changing or increasing the distance between the hob plate and the display device to protect the display device from thermal damage.
  • a heat source in particular hot cookware, could be placed by a user on the hob plate, at least partially covering the display area. This increases the temperature under the hob plate within the display area or adjacent to the display area and the display device is heated. As a result of the heating of the display device, it can suffer thermal damage, in particular if certain temperatures, for example 80 ° C. or 95 ° C., are exceeded.
  • the hob according to the invention can advantageously prevent this thermal damage by changing the distance between the hob plate and the display device by changing or increasing the distance as a function of the temperature.
  • the thermal actuator preferably changes the distance in such a way that the distance between the display device and the heat source or the hob plate on which it stands is increased.
  • the distance between the hob plate and the display device is advantageously increased if the temperature within the display area or adjacent to the display area leads to the fear of thermal damage to the display device, and the previously increased distance is reduced again if the temperature within the display area or on the display area adjacent there is no longer any fear of thermal damage to the display device.
  • the invention thus solves the problem on which it is based, namely to provide a hob which protects its display device from damage caused by excessively high temperatures.
  • the thermal actuator has a first state if the temperature is lower than a limit temperature.
  • the thermal actuator has a second state if the temperature is equal to or greater than the limit temperature.
  • the distance between the hob plate and the display device is greater in the second state of the thermal actuator than in the first state of the thermal actuator, at least in the area of this thermal actuator.
  • a distance between a heat source, which increases the temperature, and the display device is preferably greater in the second state than in the first state.
  • the limit temperature may be a temperature at which there is a high possibility that the display device will suffer thermal damage. It can be at the aforementioned temperatures.
  • the limit temperature is generally in a range from 50.degree. C. to 200.degree. C., in particular 75.degree. C. to 150.degree. C., preferably 80.degree. C. to 100.degree.
  • the limit temperature can be 85 ° C or 95 ° C.
  • the distance in the second state of the thermal actuator is at most 10 mm, in particular at most 5 mm, greater than in the first state of the thermal actuator.
  • the display device therefore moves this distance downwards or away from the hob plate. Only small changes in the distance are advantageously required in order to protect the display device from thermal damage.
  • the thermal actuator in the first state is designed to have the second state within 3 seconds or less after the temperature has risen to the limit temperature or has exceeded the limit temperature.
  • Such a fast reaction time of the thermal actuator advantageously prevents thermal damage to the display device.
  • the thermal actuator is advantageously arranged between the display device and the hob plate.
  • the thermal actuator is arranged in a corner area of the display device or in a side area of the display device, preferably at least in the corner area or the side area facing the cooking area.
  • a thermal actuator can preferably be arranged in each corner area or side area.
  • the thermal actuator has a thermoactive material which is designed to change the distance between the hob plate and the display device as a function of the temperature.
  • the thermoactive material can advantageously be a thermoactive plastic, a shape memory alloy, an expansion material or a thermal bimetal.
  • the thermoactive material can preferably have a positive coefficient of thermal expansion.
  • the thermal actuator can advantageously be designed in one piece and consist entirely of the thermoactive material.
  • the thermoactive plastic can consist of so-called DiAPLEX or have this or generally be a shape memory plastic as a polymer (shape memory polymer), as offered by SMP Technologies Inc., for example.
  • a metallic shape memory alloy can preferably have one or more of the elements nickel, titanium, chromium, cobalt, niobium, copper, zinc, aluminum, iron or manganese.
  • the shape memory alloy can have a nickel-titanium alloy.
  • the thermoactive material can advantageously also be a so-called 2-way shape memory material with a 2-way memory effect, which can then possibly even be reversibly deformed. Then return means or the like are not mandatory. How For example, springs are necessary to bring the thermoactive material back into its starting position or original position after a temperature that is too high has subsided.
  • thermoactive material can for example have an oil, a wax, a hard paraffin or a metal.
  • the thermal bimetal can have a metal strip made of two different metals with mutually different coefficients of thermal expansion.
  • one metal of the thermal bimetal is steel or Invar and the other metal is zinc, copper or brass.
  • the thermoactive material can be arranged between the hob plate and the display device.
  • the thermoactive material can preferably be arranged on at least two corner areas or on at least two side areas of the display device, in particular on the corner areas or on the side areas which border on the cooking area.
  • the thermal actuator can be an element made of thermoactive material, advantageously a bending element, in particular rod-shaped, a spring or a helical spring. Other shapes are also generally advantageous; they will each be explained below.
  • the hob has a seal which is designed to prevent dust or dirt from penetrating between the display device and the hob plate.
  • the seal is arranged between the display device and the hob plate.
  • the seal can rest against the hob plate, in particular rest in a sealing manner.
  • the seal can rest against the display device, in particular rest in a sealing manner.
  • the seal can advantageously prevent the ingress of dust or dirt between the display device and the hob plate, independently of the first state and the second state of the thermal actuator, that is, in every possible position of the display device when the hob is expected to be in operation.
  • the seal is advantageously designed to be elastic or changeable in shape. Then no dust or dirt can penetrate between the display device and the hob plate when the thermal actuator changes their distance.
  • the seal can preferably be a round hose seal or a bellows seal.
  • the seal has the thermoactive material.
  • the thermoactive material is preferably integrated into the seal.
  • the thermoactive material can preferably be arranged within the seal.
  • the seal can consist of the thermoactive material in sections or completely.
  • the seal and the thermoactive material can be made in one piece or in several pieces.
  • the thermoactive material can preferably be a thermoactive plastic from which the seal is made. Alternatively, it can thermoactive material be surrounded by a sealing material of the seal, which is in contact with the hob plate and the display device.
  • the seal can be rectangular, the seal having the thermoactive material in its corners.
  • the display device has a receptacle for the seal, for example as a groove or slot, in particular as an undercut groove.
  • the seal can rest against the receptacle of the display device, in particular rest in a sealing manner. You can partially intervene in the recording.
  • the seal runs around an outer edge of the display device.
  • the seal runs around the outer edge in sections or completely.
  • the hob has a number of prestressing elements, in particular two, three, four, six or eight prestressing elements, which press or prestress the display device in the direction of the hob plate.
  • the prestressing elements can be springs, in particular helical springs or leaf springs.
  • the thermal actuator can be designed to overcome a prestressing force of the prestressing elements when it changes the distance between the hob plate and the display device as a function of the temperature, in particular when it increases it.
  • the preloading elements are advantageously designed to transfer the thermal actuator from the second state to the first state if the temperature is lower than the limit temperature.
  • the object on which the invention is based is also achieved by a method for operating an aforementioned hob, in particular for protecting a display device of the hob from thermal damage.
  • the display device is arranged within a display area below a hob plate and the method has the steps of: detecting a temperature within the display area or adjacent to the display area and / or on the hob plate and increasing a distance between the hob plate and the display device, if the detected temperature is equal to or greater than a limit temperature.
  • the steps of acquiring and enlarging can be carried out simultaneously or in succession, in particular first acquiring and then enlarging.
  • the acquisition and enlargement steps are carried out by a thermoactive material, preferably automatically. In particular, an automatic adjustment of the display device can take place without the need for intervention by a control or an operator.
  • the invention avoids the disadvantages of the prior art and protects the display device from impairment or even damage from temperature. This applies in particular when a user places a heat source, for example hot cookware, on the hob plate within the display area and thus above the display device or adjacent to the display area.
  • a heat source for example hot cookware
  • Fig. 1 shows a cross section of a hob 100 according to the invention.
  • the hob 100 has a hob plate 110 with a display area 116 and a cooking area.
  • the display area 116 is arranged next to the cooking area and does not overlap the cooking area.
  • the in Fig. 1 The cross section shown shows only the display area 116 and not the cooking area.
  • the hob plate 110 has an underside 112 and, opposite, an upper side 114.
  • a cookware 50 can be placed on the top 114 in order to heat the cookware 50 with the hob 100.
  • the cooking utensils 50 are heated with a heating device, not shown, which is arranged under the hob plate 110 and within the cooking area.
  • a heating device not shown, which is arranged under the hob plate 110 and within the cooking area.
  • Fig. 1 shows that the cookware 50 in the form of a saucepan was not placed completely within the cooking area, but at least partially within the display area 116 or adjacent to this display area 116.
  • a display device 120 is arranged within the display area 116 under the hob plate 110, resting against its underside 112.
  • the display device 120 is designed to output information about the hob 100 and / or operating functions of the hob 100 in a known manner. The output takes place by means of a display 122 of the display device 120.
  • the display device 120 can also have operating elements, preferably as touch controls, in particular as a touch display or by means of discrete touch sensors.
  • the display device 120 is prestressed by prestressing elements 130 in the form of helical springs by pressing the display device 120 from below in the direction of the hob plate 110 against the underside 112 of the hob plate 110 in such a way that the display 122 touches the underside 112, possibly by means of spacers provided for this purpose the top.
  • prestressing elements 130 in the form of helical springs by pressing the display device 120 from below in the direction of the hob plate 110 against the underside 112 of the hob plate 110 in such a way that the display 122 touches the underside 112, possibly by means of spacers provided for this purpose the top.
  • the display device 120 also has a mounting plate 124 to which the display 122 is attached.
  • the mounting plate 124 is larger than the display 122.
  • a section of the mounting plate 124 protruding beyond the display 122 forms a mounting 125 in the form of a flat surface for at least one spacer 140.
  • the hob 100 shown has a plurality of spacers 140 which are arranged between the display device 120 and the hob plate 110, in particular the spacers 140 rest on the underside 112 and on the receptacle 125.
  • the spacers 140 are advantageously made of a material that conducts heat very well, and are particularly advantageously elastic.
  • the spacers 140 are arranged in sections around the display 122 and maintain the distance between display device 120 and hob plate 110, in particular between display 122 and underside 112.
  • the spacers 140 are each surrounded by a thermal actuator 150.
  • the hob 100 therefore has a total of as many thermal actuators 150 as there are spacers 140, for example 4 or 6 or 8.
  • a respective thermal actuator 150 is designed as a helical spring 151, 152.
  • the thermal actuators 150 are arranged between the display device 120 and the underside 112 of the hob 110; in particular, the thermal actuators 150 rest on the receptacle 125 and on the spacer 140. In an alternative embodiment, not shown, the thermal actuator 150 can rest against the underside 112 and against the mounting plate 124, in particular against the mounting 125.
  • the material of the thermal actuators 150 is thermally active and consists of a nickel-titanium shape memory alloy.
  • the thermal actuators 150 have a first state, which is shown in FIG Fig. 1 and a second state shown in FIG Fig. 2 is shown. In the second state, a respective thermal actuator 150 assumes a trained form of the shape memory alloy.
  • a respective thermal actuator 150 has the second state when a temperature of the thermal actuator 150 is equal to or greater than a limit temperature, the limit temperature being in the aforementioned range from 80 ° C. to 100 ° C., in particular the limit temperature being 85 ° C. up to 95 ° C.
  • the limit temperature is selected in such a way that if the thermal actuator 150 has it, the display device 120 would have a corresponding temperature at which it begins to suffer thermal damage. In particular, the display 122 would be thermally damaged.
  • the limit temperature can be selected such that the limit temperature is lower than a temperature at which the display device 120 would suffer thermal damage.
  • the limit temperature can be selected in such a way that the display device 120 would suffer thermal damage if the display device 120 were to have a temperature which exceeds the limit temperature by 5 ° C.
  • the thermal actuators 150 are advantageously designed and arranged within the hob 100 such that the temperature of a respective thermal actuator 150 is equal to a temperature within the display area 116.
  • the respective thermal actuator 150 therefore changes its state as a function of the temperature within the display area 116 or adjacent to the display area 116 and / or on the hob plate 110. This may be different for several actuators, but this is intended.
  • Each thermal actuator can only be activated if the temperature is too high or if it is exposed to it and detects it.
  • the thermal actuators 150 are designed in such a way that when a respective thermal actuator 150 assumes its second state as a result of a temperature rise, it overcomes the prestressing of the prestressing elements 130 or the opposing prestressing element 130 and increases the distance between the display device 120 and the hob plate 110. The distance is increased by pushing the display device 120 away from the hob plate 110 downwards by the respective thermal actuator 150, whereby a respective pretensioning element 130 is compressed.
  • the distance between the display device 120 and the hob plate 110 is larger by 5 mm to 10 mm.
  • the thermal actuators 150 have the second state, the display 122 no longer touches the lower side 112 and there is an enlarged air gap 160 between the display 122 and the lower side 112, which has a thermally insulating effect.
  • the thermal actuator 150 is transferred from the second state to the first state by the prestressing elements 130. Furthermore, the pretensioning elements 130 press the display device 120 upwards against the underside 112 in such a way that the display 122 or its spacers touch the underside 112 when the respective thermal actuator 150 has been returned to the first state.
  • the cookware 50 of FIG Fig. 1 a temperature that is greater than the limit temperature.
  • the cookware 50 contains fat that has been strongly heated with the hob.
  • the cookware 50 therefore has a temperature of over 100 ° C, for example 200 ° C.
  • the cookware 50 that is hot in this way has at least partially been placed within the display area 116 by an operator. It acts as a heat source that increases the temperature on the hob plate and within the display area.
  • the temperature of the thermal actuators 150 and the temperature on the display 122 increase.
  • the display 122 suffers thermal damage if it were heated to above 85.degree.
  • the limit temperature of the thermal actuators 150 is therefore selected to be 80 ° C. here.
  • a respective thermal actuator 150 assumes the second state and increases the distance by 5 mm between the display 122 and the heat source, shown in FIG Fig. 2 .
  • the resulting or enlarged air gap 160 between the display 122 and the underside 112 has a thermally insulating effect. Typically, such an increase in the distance is sufficient to protect the display 122 from thermal damage in the range of these temperatures.
  • a respective thermal actuator 150 is designed to have the second state within less than 3 seconds after its temperature has risen to the limit temperature. Preferably, within less than, for example, 4 seconds or 8 seconds after the hot cookware 50 has been placed within the display area 116, the thermal actuator 150 can have the second state. Typically, this time is sufficient to protect the display 122 from thermal damage.
  • Fig. 3 shows the hob 100, the cooking area 118 and the display area 116 being shown.
  • the transition between the cooking area 118 and the display area 116 is shown by a vertical dashed line.
  • a heating device 170 is arranged within the cooking area 118.
  • the hot cookware 50 is partially placed in the cooking area 118 and partially in the display area 116. It is heated with at least the heating device 170. In this case, the temperature also rises on the hob plate 110 and within the display area 116, but only locally within the display area 116, namely on the right.
  • the right thermal actuator 150 is heated in such a way that it assumes the second state, while the other left thermal actuator 150 has the first state.
  • a thermal actuator 150 also changes the distance between the hob plate 110 and the display device in that the right-hand thermal actuator 150 pushes the display 122 away from the hob plate 110 and an air gap 160 arises or becomes larger.
  • Fig. 4 and 5 show an embodiment of the hob 100 according to the invention, wherein Fig. 4 shows the first state of the thermal actuators 150 and Fig. 5 the second state.
  • Fig. 4 shows the first state of the thermal actuators 150 and Fig. 5 the second state.
  • the same reference symbols are used for identical and functionally equivalent elements. In this respect, the above statements on the embodiment of the Figs. 1 to 3 are referenced, so that essentially only the existing differences will be discussed below.
  • the spacers 140 are arranged here in such a way that the thermal actuators 150 rest against the underside 112 of the hob plate 110 and against the spacers 140.
  • the thermal actuators 150 are in comparison to the exemplary embodiment of FIG Figs. 1 to 3 arranged closer to the hob plate 110.
  • the thermal actuators 150 can be heated more quickly and at a higher temperature if hot cookware is placed within the display area 116 or adjacent to the display area.
  • the thermal actuator 150 and the seal 141 of FIG Fig. 6 are made in one piece.
  • the seal 141 is made of the thermoactive material. It also forms the aforementioned spacer.
  • the thermoactive material is a thermoactive plastic. The thermoactive plastic expands when the temperature within the display area 116 shown in dashed lines and here on the hob plate 110 is equal to or higher than the limit temperature.
  • the seal 141 is arranged between the hob plate 110 and the display device 120 and prevents dust or dirt from penetrating between the display device 120 and the hob plate 110.
  • the display device 120 is accommodated in a housing 180 which is open towards the hob plate 110.
  • the receptacle 125 for the seal 141 results between an outer edge 126 of the display device 120 and the housing 180.
  • the seal 141 is inserted into the receptacle 125, it runs around the outer edge 126 of the display device 120.
  • the display device 120 is prestressed by four prestressing elements 130 in the form of four helical springs, which press the housing 180 together with the display device 120 from below in the direction of the hob plate 110.
  • the seal 141 is designed in such a way that the display 122 does not touch the underside 112. This is the aforementioned function of the spacer.
  • FIG. 12 shows that hot cookware 50 is placed partially in the cooking area 118 and partially in the display area 116.
  • the hot cookware 50 acts as a heat source which increases the temperature within the display area 116 and on the hob plate 110.
  • the thermal actuator 150 has the first state.
  • Fig. 8 shows the hob according to the invention Fig. 7 , wherein the thermal actuator 150 has heated as a result of the placing of the hot cookware 50 within the display area 116 and has increased the distance between the hob plate 110 and the display device 120.
  • the thermal actuator 150 has the second state.
  • the display device 120 has moved obliquely downward, so to speak, namely only or mainly in the right-hand area. This could be prevented by a parallel guide, so that the display device 120 only ever moves up or down parallel to the hob plate 110. For this, however, the effort would be very great, and the inclined position does not interfere. It is important that the seal 141 always rests in a sealing manner on the bottom of the hob plate 110 and on the housing 180.
  • FIG. 11 shows an embodiment of the display device 120 and a plurality of thermal actuators 150 for the hob of FIG Figures 6 to 8 .
  • the same reference symbols are used for identical and functionally equivalent elements. In this respect, the above statements on the embodiment of the Figures 1 to 8 to get expelled, so that essentially only the existing differences will be discussed below.
  • the display device 120 of Fig. 9 is designed to be under the hob plate 110 of the exemplary embodiment Figures 6 to 8 to be arranged.
  • the display device 120 is rectangular and has four corner areas, each with a corner and four side areas.
  • One of the thermal actuators 150, 156 is arranged in each corner of the display device 120.
  • one of the thermal actuators 150, 158 is arranged in each side area of the display device 120 which faces the cooking area of the hob 100 when the display device 120 is arranged below the hob plate 110.
  • a total of 7 thermal actuators 150 are arranged on the display device 120.
  • Each of the thermal actuators 150 consists, for example, of a thermoactive plastic, alternatively of a shape memory alloy, and has a cuboid shape. They can also have an alternative shape. By arranging even more thermal actuators, an overall higher force can be developed to push the display 122 downwards.
  • Fig. 10 shows a further embodiment of the hob 100.
  • the same reference symbols are used for identical and functionally equivalent elements.
  • the above statements on the embodiment of the Figures 1 to 9 are referenced, so that essentially only the existing differences will be discussed below.
  • a cross section of the hob 100 is shown, only the display area 116 being shown.
  • the thermal actuator 150 has a wire or a sheet metal strip made of a shape memory alloy, which is arranged within the seal 141 in a meandering shape with a special shape.
  • the seal 141 is elastically stretchable and is not damaged when the thermal actuator 150 assumes its second state, that is, it pushes it apart upwards.
  • the first state of the thermal actuator 150 is shown
  • the second state of the thermal actuator 150 is shown.
  • Fig. 11 shows a further embodiment of the hob 100.
  • the same reference numerals are used for identical and functionally equivalent elements and in this respect the above statements on the embodiment of FIG Figures 1 to 10 are referenced, so that essentially only the existing differences will be discussed below.
  • the hob 100 has a plurality of thermal actuators 150, each of which can consist of a wire or a sheet metal strip made of a shape memory alloy.
  • the plurality of thermal actuators 150 are arranged at regular intervals within the seal 141.
  • hot cookware 50 has been placed on the hob plate 110 partially within the display area 116.
  • the temperature within the display area 116 and on the hob plate 110 has increased such that a limit temperature has been exceeded for some of the plurality of thermal actuators 150 and these are in the second state.
  • the thermal actuators 150 have expanded to different extents, namely more and more to the right. This means that to the right the temperature increases. This results in an inclined position of the display device 120, but this does not do any harm. On the contrary, this fits particularly well, since the display device 120 moves downward where it is necessary because of excessively high temperatures from above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Baking, Grill, Roasting (AREA)
EP20194029.3A 2019-09-20 2020-09-02 Plaque de cuisson et procédé de fonctionnement d'une plaque de cuisson Active EP3796751B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019214367.9A DE102019214367B4 (de) 2019-09-20 2019-09-20 Kochfeld und Verfahren zum Betrieb eines Kochfelds

Publications (2)

Publication Number Publication Date
EP3796751A1 true EP3796751A1 (fr) 2021-03-24
EP3796751B1 EP3796751B1 (fr) 2022-11-16

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EP20194029.3A Active EP3796751B1 (fr) 2019-09-20 2020-09-02 Plaque de cuisson et procédé de fonctionnement d'une plaque de cuisson

Country Status (4)

Country Link
EP (1) EP3796751B1 (fr)
KR (1) KR20210034499A (fr)
DE (1) DE102019214367B4 (fr)
ES (1) ES2937073T3 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219675A1 (fr) * 1985-10-05 1987-04-29 Braun Aktiengesellschaft Plaque de chauffage, en particulier pour machine à café électrique
DE102012212350A1 (de) * 2012-07-13 2014-01-16 E.G.O. Elektro-Gerätebau GmbH Kochfeld
DE202016103321U1 (de) * 2016-01-21 2016-07-06 Schott Ag Kochmulde mit einer Glaskeramik-Kochfläche

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19711541A1 (de) * 1997-03-20 1998-09-24 Ako Werke Gmbh & Co Elektrokochplatte
DE102017220889A1 (de) * 2017-11-22 2019-05-23 BSH Hausgeräte GmbH Backofen mit Sensoreinrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219675A1 (fr) * 1985-10-05 1987-04-29 Braun Aktiengesellschaft Plaque de chauffage, en particulier pour machine à café électrique
DE102012212350A1 (de) * 2012-07-13 2014-01-16 E.G.O. Elektro-Gerätebau GmbH Kochfeld
DE202016103321U1 (de) * 2016-01-21 2016-07-06 Schott Ag Kochmulde mit einer Glaskeramik-Kochfläche

Also Published As

Publication number Publication date
KR20210034499A (ko) 2021-03-30
DE102019214367B4 (de) 2021-06-10
ES2937073T3 (es) 2023-03-23
DE102019214367A1 (de) 2021-03-25
EP3796751B1 (fr) 2022-11-16

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