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EP1258171B1 - Surface de cuisson avec capteur de temperature - Google Patents

Surface de cuisson avec capteur de temperature Download PDF

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Publication number
EP1258171B1
EP1258171B1 EP01905751A EP01905751A EP1258171B1 EP 1258171 B1 EP1258171 B1 EP 1258171B1 EP 01905751 A EP01905751 A EP 01905751A EP 01905751 A EP01905751 A EP 01905751A EP 1258171 B1 EP1258171 B1 EP 1258171B1
Authority
EP
European Patent Office
Prior art keywords
hob
heating element
underside
plate
heating
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.)
Expired - Lifetime
Application number
EP01905751A
Other languages
German (de)
English (en)
Other versions
EP1258171A1 (fr
Inventor
Dan Neumayer
Uwe Has
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete 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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1258171A1 publication Critical patent/EP1258171A1/fr
Application granted granted Critical
Publication of EP1258171B1 publication Critical patent/EP1258171B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • 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 a hob according to the preamble of claim 1, and a corresponding heating element and a suitable element.
  • Such a hob is known from the document DE 37 03 768 C2, wherein a device for detecting the temperature of a heated by means of heating coils or halogen lamps glass ceramic plate is disclosed with a temperature sensor. This emits a signal corresponding to the temperature of the glass ceramic for a control circuit.
  • the heating coils or the halogen lamps are arranged in the interior of a pot-like insulating support and heat the glass ceramic plate via direct radiation.
  • the edge of the insulating substrate is spring-loaded on the underside of the glass-ceramic plate, and the temperature sensor is disposed outside the interior of the insulating substrate but inside the heating element.
  • the temperature sensor is further in thermally conductive connection with the underside of the glass ceramic plate, wherein the temperature sensor is arranged in a receptacle in the edge of the insulating support.
  • the receptacle is arranged at a distance x to the inside of the edge of the insulating support, the minimum value of which is selected so that the short-term temperature changes occurring when the heating coils or the halogen lamps are switched on and off have only a negligible influence on the temperature sensor.
  • the maximum value of the distance x is chosen such that the delay in the control characteristic caused by the thermal conductivity of the glass ceramic plate results in a small hysteresis. As a distance x widths of 3 mm to 6 mm have proven to be advantageous.
  • the temperature sensor is introduced into the introduced or indented receptacle on the upper side of the projection, which protrudes into the interior of the insulating support, and is in heat-conducting connection with the underside of the glass ceramic plate.
  • the temperature sensor is indirectly held under spring tension on the underside of the glass ceramic plate in order to keep the heat transfer resistance between the glass ceramic plate and the temperature sensor small.
  • a heating element for a cooking unit with a temperature sensor is known.
  • a heat transfer element in the form of a sheet is used, which is arranged partially overlapping the heated area between the radiators and the glass ceramic plate, but protrudes from the heating element and there with the Temperature sensor of the controller is in communication.
  • the heat transfer element is fixed on the edge of the heating shell bearing by clamping and is usually on the underside of the glass ceramic plate. From the heat-sensing region of the heat transfer element, an outer section protrudes outwards beyond the edge of the heating element.
  • the sensor socket of the temperature sensor is pressed by a compression spring to the underside of the heat transfer surface of the heat transfer element, which is supported on a leading the sensor socket, mounted on the outer portion of the heat transfer element holding mechanism.
  • a compression spring to the underside of the heat transfer surface of the heat transfer element, which is supported on a leading the sensor socket, mounted on the outer portion of the heat transfer element holding mechanism.
  • an electrical NTC or PTC sensor can be used, which is pressed resiliently or is fixedly attached to the outer portion of the heat transfer element.
  • the heat transfer element can be grounded, providing contact protection.
  • US Pat. No. 4,447,710 discloses a glass-ceramic cooking field in which an insulating body is arranged in the edge area of the heating element, on which a temperature sensor, for example a thermocouple, is seated.
  • the thermocouple is held in good thermal contact with the underside of the glass ceramic plate by means of the insulation block.
  • Object of the present invention is to provide a generic hob and a corresponding heating element, which have a good accuracy.
  • this is achieved in that in a hob according to the preamble of claim 1, the temperature sensor by means of a heat-conducting Element is thermally in contact with the underside of the hob plate, and that the element and the temperature sensor are shielded by insulating material against the heat radiation of the heating medium.
  • a temperature is determined quickly and accurately enough by the measuring arrangement, which corresponds approximately to a frying pan placed above the heating element on the hob plate. It is also ensured that the heat transfer from the frying pan or the hob plate to the temperature sensor is not limited to the areally very small temperature sensor.
  • the surface area A of the element, which is in thermal contact with the underside of the hob plate is at least 5 times, in particular approximately 10 times, larger than the base area B of the temperature sensor.
  • a lateral distance a of the element to the edge region of the insulating material is about 6 to 12 mm, in particular about 8 mm.
  • the temperature sensor is attached to the element, in particular poured into the element attached to this.
  • the heat conduction element in the region of the outer peripheral wall of the heating element or the insulating support attached directly or with the aid of an intermediate mounting part, in particular screwed.
  • the intermediate mounting part is fixed in the bottom region of the heating element and extends in the region of the outer peripheral wall of the heating element, in which the element is in turn screwed to the intermediate mounting part.
  • the temperature sensor is attached to the underside of the element.
  • a large plane contact surface for improving the heat conduction from the underside of the glass ceramic plate to the temperature sensor can be realized.
  • the temperature sensor is characterized by the larger area element in the assembly process, e.g. when falling the unit element / temperature sensor, better mechanically protected.
  • the element may have a receiving portion for the temperature sensor and a mounting portion for the attachment of the element, in particular in the heating element, wherein the receiving portion is radially laterally offset from the mounting portion.
  • the temperature sensor is to be mounted in the immediate vicinity of a temperature limiter present in the heating element.
  • the temperature limiter namely the mounting space in the region of the outer peripheral wall of the heating element is limited, on the other hand, it is favorable if the various electrical connections of the temperature limiter and the temperature sensor are as close as safety-friendly together.
  • the element is formed at least in two parts.
  • a receiving part for the temperature sensor consists of a softer material in order to be able to geometrically reshape the receiving part in an application-specific and safety-related manner.
  • the remainder of the element may consist of a different material, wherein in particular a spring material is suitable for being able to press the element in a defined manner against the underside of the glass-ceramic plate.
  • the element is designed as a torsion spring, wherein the torsion region of the spring element is provided substantially outside the heating element and thus in a cooler area.
  • the element is designed to be electrically conductive and grounded in order to optimally meet the safety regulations with a simple structure.
  • the electrical leads of the temperature sensor are connected to a first connection portion of the element or a fitting mounted there.
  • the element can also have a second connection section, to which a grounding line of the element is connected.
  • a hob 1 has a hob plate 3, in particular made of glass ceramic, on (Fig. 1). Below the hob plate 3 are different in a conventional manner Heating elements 5 of the hob provided, which are pressed in a known manner to the underside of the hob plate 3 (not shown). In the region of the heating element 5, the hob plate 3 is usually decorated accordingly on its upper side. In this heated area a cooking vessel 6 is shut off. The bottom of the cooking vessel 6 is in the cold state often only in the edge region of the heating element 5 in an annular surface on the hob plate 3, while in the central residual region of the pot bottom is spaced by an air gap from the plate (Fig. 1). In the heated state, this air gap is reduced or ideally to approximately zero by the known thermally induced movement of the pot bottom.
  • the heating element 5 has a cup-shaped sheet metal pot 7, in which a circular disk-shaped insulation plate 9 is located. Furthermore, an inner insulation ring 11 and an outer insulation ring 13 corresponding to a two-circuit heating arrangement are provided within the sheet metal pot 7 on the insulation plate 9. As a result, the interior of the heating element 5 is separated into an inner and an outer heating region, in each of which a Bandterrorismleiter 15 extends (Fig. 1, Fig. 2). In known manner, a Schuleiteran gleichteil 17 is fixed in the region of the outer peripheral wall of the sheet metal pot 7, which is on the one hand conductively connected to the Bandterrorismn 15 and on the other hand to not shown electrical supply lines of the hob 1 can be connected (Fig. 2).
  • the heating element 5 also has a known temperature limiter 19, whose rod extends transversely across the heated region of the heating element.
  • the terminal block of the temperature limiter 19 has the known and usual, laterally issued Kunststoffflachsteckite for connection to the power supply line or to the Schuleiteranschlußteil 17 of the heating element 5.
  • an insulation block 21 is disposed in the region of the temperature limiter 19. This can serve to thermally shield the temperature limiter 19 in the region of sections of the band heating conductor 15 guided below the insulation block 21.
  • a receiving recess 23 is milled in its upper side.
  • a heat-conducting element 25 is arranged with its element hood 27 (FIGS. 1, 2, 3).
  • hood 27 is not seated directly on the bottom of the recess 23 so that the hood 27 can yield slightly to a blow on the hob plate 3. As a result, damage or breakage of the plate 3 can be avoided, especially if it is made of glass or glass ceramic material.
  • the element hood 27 In the receiving space formed by the element hood 27 is by means of a temperature-resistant and thermally conductive ceramic adhesive 28 as a temperature sensor 29, a PT-500 probe embedded with its sensor leads 30 and thereby secured and guided.
  • the material of the element cover 27 is X7 steel and the hood 27 is designed as a bent part.
  • the hood material must have sufficiently good heat conduction properties, must be well deformable, as explained below, but sufficiently mechanically stable over the entire temperature range of up to 350 - 400 ° C, and retain its properties even at these temperatures.
  • two side walls 31 are bent substantially at right angles down (Fig. 3). Also bent at right angles to the side walls 31 define bottom walls 33 a slot-shaped open bottom of the element cover 27.
  • the front side of the receiving space of the hood is closed by a right angle bent from the top wall end wall 35.
  • the hood-like design of the element 25 ensures that the safety-prescribed air and creepage distance to the live temperature sensor 29 is maintained in the event of breakage of the hob plate 3, without the base of the element 25 and the hood 27 and thus of the insulation block 21 too large to have to shape. More detailed explanations on the geometric design and arrangement of the temperature sensor 29, the element 25 and the insulation block 21 are made in connection with the description of the sketched in Fig. 5 third embodiment.
  • the hood 27 is fixedly connected to a substantially L-shaped hood carrier 37 made of steel, preferably welded.
  • the element hood 27 is seated on a connecting section 39 of the hood carrier 37 (FIG. 3).
  • the top wall of the element hood 27 is slightly elevated relative to the top of the hood support 37 and defines and limits a surface area A in which the element 25 rests on the underside of the hob plate 3 in a heat-conducting manner (FIGS. 1, 2, 5). Due to the overlapping connection of hood 27 and hood carrier 37, the stability of the connection is also increased.
  • the cage carrier 37 is made of 0.8 mm thick material in order to be suitable for the earthing plug-in connections described below, the element cover 27 is made of thinner material, which additionally simplifies their forming.
  • the hood carrier 37 merges in a spring section 41 into a mounting section 43 (FIGS. 2, 3).
  • the spring portion 41 is arranged substantially outside the heated region of the heating element 5 and the outer insulation ring 13.
  • the mounting portion 43 of the hood support 37 has a rectangularly downward bent mounting plate 45 with mounting holes 47.
  • the heat-conducting element 25 height adjustable via an intermediate mounting member 48 on the outer peripheral wall of the sheet metal pot 7 are fixed (Fig. 2).
  • the intermediate mounting part 48 is bolted on the one hand to the underside of the sheet metal pot 7 in the bottom thereof (not shown). This part 48 extends approximately L-shaped from the bottom of the heating element to its side wall 7.
  • the heat-conducting element 25 is then screwed to the intermediate mounting part 48 and thus defined in terms of height the position of the heat-conducting element 25 defined.
  • the heat-conducting element 25 can also be screwed to the outer wall of the sheet-metal pot 7 in the region of the assembly openings 47.
  • a connection part can be attached (not shown), with the one hand, the electrical sensor leads 30 of the temperature sensor 29 connectable, eg attachable, and are connected to the other hand electrical connection lines of a control unit 101 (Fig.
  • connection part is further to ensure that the electrical connections of the PT temperature sensor 29 to ground or the grounded hood carrier 37 are isolated.
  • the temperature sensor and the sensor lines 30 are covered over the entire length of the heat-conducting element 25 deck.
  • the mounting plate 45 has a flat pin 49 to which a grounding line 51 and their standardized AMP plug of the hob is directly pluggable. As a result, the heat-conducting element 25 is set to ground potential.
  • the ohmic resistance of the element 25 is at a value of 0.1 ohms or less in order to withstand a continuous current load of at least 25 A.
  • the allowed Heat-conducting element 25 should also not be designed to be stiff in order to be able to yield properly under mechanical load or movement of the hob plate 3. Otherwise would be feared by a too stiff concern of the element 25 and the element cover 27 on the hob plate 3 hotplate chipping on the underside of the plate 3 or possibly also their breakage.
  • Fig. 4 is shown in sections in a cross-sectional view transversely to the longitudinal extent of the element and thus approximately perpendicular to the line II in Fig. 2 of the hob shown in which the temperature sensor 29 together with a heat conducting element 75 in the region of the insulation block 21 similar to the first embodiment is arranged.
  • the heat-conducting element 25 has no element hood, but rather an element shell 77. This element shell is likewise arranged in a suitable receiving depression 23 of the insulation block 21.
  • the insulation shell lies in its edge regions in an annular surface directly on the underside of the glass ceramic plate 3 and is thus in thermally conductive connection with it.
  • the temperature sensor 29 is arranged, wherein the shell is additionally filled by a thermal paste.
  • the heat conducting element 75 not shown in detail could otherwise be shaped like the heat conducting element 25 of the first embodiment. For safety reasons, however, the temperature sensor 29 is operated with a safety extra-low voltage or transmits its measuring signal without contact from the heating element.
  • the heat-conducting element 85 designed in the shape of a hood has an element hood 87 which corresponds to that of the first exemplary embodiment.
  • a mounting portion 89 of the hood carrier 37 is not laterally offset radially arranged to the receiving portion of the element hood 87. Rather, the mounting portion 89 extends in extension of the element cover 87 radially unopposed along the outer wall of the sheet metal pot 7 vertically downwards.
  • Fig. 5 is shown schematically in which area A, the heat conducting element 85 is thermally in contact with the underside of the hob plate 3.
  • the size of the surface is about 50 to 100 mm 2 .
  • the contact surface A is about 10 times larger than a base B of the temperature sensor 29. This ensures, inter alia, that the temperature at the bottom of the cooktop panel by the temperature sensor not quasi point-like, but determined integrating over a larger area becomes. This is particularly important because the respective pan diameter and its soil properties are not known exactly and can also vary from pan to pan type.
  • a lateral minimum distance a of the element 85 to the edge region of the insulating material 21 is about 8 mm.
  • the temperature sensor 29 and the element hood 27 are shielded by the insulation block 21 on the one hand sufficiently against the emanating from the Bandbyleiter 15 thermal radiation.
  • the insulation block is still small enough to avoid an adverse shading of the cooking vessel bottom 6 and thereby caused undesirable uneven heat distribution in the pan bottom when heating or frying.
  • the heat-conducting element 25 is still sufficiently thermally coupled to the region of the hob plate, which is heated directly by the heat radiation of the heating means 15. This is also achieved in the first and in the third embodiment, wherein at the same time the temperature sensor 29 relative to the hob plate 3 is covered by a grounded protective element 27 in compliance with the required according to 4 or 8 mm creepage and air gap.
  • the measuring surface A is coupled by a high-temperature lubricant to the cooktop plate underside, which consists in particular of glass ceramic material, in order to achieve improved heat transfer and impact resistance improved damping.
  • FIG. 6 schematically shows a block diagram showing the most important components of the cooktop.
  • the control unit 101 regulates the heating power of the BandMapleiters 15 according to the measured values of the temperature sensor 29 to the predetermined by an input unit 103 target value. As a result, it can be achieved, in particular, that burning is virtually impossible during roasting.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)
  • Cookers (AREA)
  • Resistance Heating (AREA)

Claims (10)

  1. Surface de cuisson avec une plaque de cuisson (3) au-dessous de laquelle est disposé au moins un élément chauffant (5) destiné à chauffer un récipient de cuisson pouvant être déposé sur la plaque de cuisson, et avec un capteur de température (29) destiné à détecter la température de la plaque de cuisson, lequel capteur de température, à l'intérieur de l'élément chauffant, sonde la température de la face inférieure de la plaque de cuisson et, au moyen d'une matière isolante (21), est protégé contre le rayonnement thermique d'un moyen chauffant (15) de l'élément chauffant (5) et est relié à une unité de commande (101) destinée à commander la puissance de chauffage de l'élément chauffant (5), caractérisée en ce que le capteur de température (29), au moyen d'un élément thermoconducteur (25 ; 75 ; 85) est en contact thermoconducteur avec la face inférieure de la plaque de cuisson (3) et en ce que l'élément (25 ; 75 ; 85) et le capteur de température (29), au moyen d'une matière isolante (21), sont protégés contre le rayonnement thermique du moyen chauffant (15).
  2. Surface de cuisson selon la revendication 1, caractérisée en ce que le capteur de température (29) est fixé sur la face intérieure de l'élément (25 ; 85) et en ce que l'élément est plaqué contre la face inférieure de la plaque de cuisson (3).
  3. Surface de cuisson selon la revendication 1 ou 2, caractérisée en ce que la zone de surface A de l'élément (25 ; 85), laquelle est en contact thermique avec la face inférieure de la plaque de cuisson (3), est environ au moins 5 fois, en particulier environ 10 fois plus grande que la surface de base B du capteur de température (29).
  4. Surface de cuisson selon l'une des revendications précédentes, caractérisée en ce qu'une distance latérale a de l'élément (25 ; 75 ; 85) à la zone périphérique de la matière isolante (21) est de l'ordre de 6 à 12 mm, en particulier de l'ordre de 8 mm.
  5. Surface de cuisson selon l'une des revendications précédentes, caractérisée en ce que le capteur de température (29) est disposé dans la zone d'un limiteur de température (19) de l'élément chauffant (5).
  6. Surface de cuisson selon l'une des revendications précédentes, caractérisée en ce que le capteur de température est fixé sur l'élément (25 ; 75 ; 85) en étant moulé dans celui-ci.
  7. Surface de cuisson selon l'une des revendications précédentes, caractérisée en ce que l'élément (25 ; 75 ; 85) est réalisé en tant qu'élément ressort et, dans la seule zone du capteur de température (29), est plaquée contre la face inférieure de la plaque de cuisson (3).
  8. Surface de cuisson selon l'une des revendications précédentes, caractérisée en ce que l'élément (25 ; 85), au moins dans la zone du capteur de température (29), est réalisé sensiblement en forme de coiffe et présente des parois supérieures et latérales (31 ; 35) de type jupe.
  9. Surface de cuisson selon la revendication 8, caractérisée en ce que la coiffe (27 ; 87), côté fond, est fermée au moins en partie.
  10. Elément chauffant pour une surface de cuisson selon l'une des revendications précédentes.
EP01905751A 2000-02-16 2001-02-08 Surface de cuisson avec capteur de temperature Expired - Lifetime EP1258171B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10006956 2000-02-16
DE10006956A DE10006956A1 (de) 2000-02-16 2000-02-16 Kochfeld mit Temperaturfühler
PCT/EP2001/001385 WO2001062048A1 (fr) 2000-02-16 2001-02-08 Espace de cuisson a sonde pyrometrique

Publications (2)

Publication Number Publication Date
EP1258171A1 EP1258171A1 (fr) 2002-11-20
EP1258171B1 true EP1258171B1 (fr) 2006-09-27

Family

ID=7631127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01905751A Expired - Lifetime EP1258171B1 (fr) 2000-02-16 2001-02-08 Surface de cuisson avec capteur de temperature

Country Status (5)

Country Link
US (1) US6753509B2 (fr)
EP (1) EP1258171B1 (fr)
AT (1) ATE341180T1 (fr)
DE (2) DE10006956A1 (fr)
WO (1) WO2001062048A1 (fr)

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US9179800B2 (en) * 2012-05-30 2015-11-10 Bsh Home Appliances Corporation Household appliance having a deployable warming drawer module
US9347671B2 (en) * 2012-05-30 2016-05-24 Bsh Home Appliances Corporation Household appliance having a warming drawer with a thermally conductive layer
US9062916B2 (en) * 2012-05-30 2015-06-23 Bsh Home Appliances Corporation Household appliance having a thermostat retainer for a thermostat of a warming drawer
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ES1135492Y (es) * 2014-12-11 2015-04-13 Eika S Coop Foco radiante adaptado a una encimera de cocción
US10718527B2 (en) * 2016-01-06 2020-07-21 James William Masten, JR. Infrared radiant emitter
CN107889300A (zh) * 2016-09-29 2018-04-06 浙江久康电器有限公司 插接式红外线电热炉盘及装用该电热炉盘的电加热灶
US20200146477A1 (en) * 2017-07-13 2020-05-14 Ember Technologies, Inc. Plateware with active temperature control
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US10634363B2 (en) 2017-10-18 2020-04-28 Haier Us Appliance Solutions, Inc. Spring bracket for a cooktop appliance
US11402104B2 (en) 2019-09-18 2022-08-02 Haier Us Appliance Solutions, Inc. Coil heating element with a heat transfer disk
US11523471B2 (en) 2019-09-27 2022-12-06 Haier Us Appliance Solutions, Inc. Coil heating element with a temperature sensor shield
US11668469B2 (en) 2020-01-22 2023-06-06 Haier Us Appliance Solutions, Inc. Cooktop appliance and heating element having a thermostat
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Also Published As

Publication number Publication date
DE50111092D1 (de) 2006-11-09
US20030029858A1 (en) 2003-02-13
ATE341180T1 (de) 2006-10-15
EP1258171A1 (fr) 2002-11-20
WO2001062048A1 (fr) 2001-08-23
DE10006956A1 (de) 2001-08-23
US6753509B2 (en) 2004-06-22

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