EP1260120B1 - Espace de cuisson a sonde pyrometrique - Google Patents

Espace de cuisson a sonde pyrometrique Download PDF

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Publication number
EP1260120B1
EP1260120B1 EP01921276A EP01921276A EP1260120B1 EP 1260120 B1 EP1260120 B1 EP 1260120B1 EP 01921276 A EP01921276 A EP 01921276A EP 01921276 A EP01921276 A EP 01921276A EP 1260120 B1 EP1260120 B1 EP 1260120B1
Authority
EP
European Patent Office
Prior art keywords
temperature sensor
cooker hob
heating
underside
plate
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
EP01921276A
Other languages
German (de)
English (en)
Other versions
EP1260120A1 (fr
Inventor
Dan Neumayer
Monika Zeraschi
Markus Theine
Peter Vetterl
Franz Grätz
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 EP1260120A1 publication Critical patent/EP1260120A1/fr
Application granted granted Critical
Publication of EP1260120B1 publication Critical patent/EP1260120B1/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 in which 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 support abuts against the underside of the glass-ceramic plate under spring tension, and the temperature sensor is outside the interior of the insulating support; however, within 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 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 from the Heating element protrudes and there is in communication with the temperature sensor of the controller.
  • 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.
  • 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 at the same time have a high safety standard and a good measurement accuracy.
  • a permanent stable positioning of a thermally conductive element with a temperature sensor of the hob and easy accessibility of connections are ensured.
  • the temperature sensor is connected to a thermally conductive element which is thermally conductive with the underside of the hob plate in conjunction, and that the element completely covers the temperature sensor up to the hob plate.
  • the temperature sensor is on the one hand thermally coupled well to the underside of the hob plate and on the other hand, the safety regulations are respect.
  • the 4 resp. 8 mm air and creepage distance between live parts and the glass ceramic hotplate complied with.
  • a complex realization of the temperature measuring arrangement for example, in safety extra-low voltage technology is not required.
  • the element also covers the electrical leads of the temperature sensor up to the hob plate out.
  • the element is approximately hood-shaped at least in the region of the temperature sensor and has an upper and apron-like lateral walls.
  • the 8 mm air and creepage distance can be maintained without having to choose the base area of the hood too large. This is particularly important because the hood together with the temperature sensor is preferably shielded from the heat radiation of the heating means of the heating element, the shielding area may not be chosen too large.
  • the hood is at least partially closed on the bottom side.
  • the heat-conducting element in the region of the outer peripheral wall of the heating element or the insulating support fixed 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 in turn screwed to the intermediate mounting part.
  • the element can be screwed to the outer peripheral wall of the heating element at different heights.
  • 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.
  • Manufacturing and assembly technology is particularly advantageous when the element is designed as a torsion spring, wherein the torsion region of the spring element is provided substantially outside of 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.
  • both the temperature sensor and the element by means of an insulating body is sufficiently shielded against emanating from a heating means of the heating element heat radiation.
  • 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 of glass ceramic, on ( Fig. 1 ).
  • different heating elements 5 of the hob are provided in a conventional manner, which are pressed in a known manner to the underside of the hob plate 3 (not shown).
  • the hob plate 3 is usually decorated accordingly on its upper side.
  • 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 of the plate ( Fig. 1 ).
  • 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 Bandterrorism 15 extends ( Fig. 1 . Fig. 2 ).
  • 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 BandChleitern 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.
  • a receiving recess 23 is milled in the top thereof.
  • a heat-conducting element 25 is arranged with its element hood 27 ( Fig. 1 . 2, 3 ). It is too Note that the 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. Due to the dome-shaped design of the element 25 ensures that the safety-specified air and creepage distance to the live temperature sensor 29 is maintained in case 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 will be described in connection with the description of in Fig. 5 sketched 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. Fig. 3 ).
  • the top wall of the element hood 27 is arranged slightly elevated relative to the top side of the hood carrier 37 and defines and delimits a surface area A, in which the element 25 rests on the underside of the hob plate 3 in a heat-conducting manner ( Fig. 1 . 2 . 5 ).
  • Due to the overlapping connection of hood 27 and hood carrier 37 is also the stability of Connection 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 is in a spring portion 41 in a mounting portion 43 via ( Fig. 2, 3rd ).
  • the spring portion 41 is arranged substantially outside the heated region of the heating element 5 and the outer insulating ring 13.
  • the mounting portion 43 of the hood support 37 has a right angle bent down 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 attached 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 pot 7 in the area of the mounting openings 47.
  • a connection part can be fastened in the mounting openings 47 (not shown), to which the electrical sensor leads 30 of the temperature sensor 29 can be connected, eg, plugged, and on 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 on which a grounding line 51 and their standard 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 amperes. Furthermore, the heat-conducting element 25 must not be made too stiff in order to be able to give in properly under mechanical loading 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.
  • the hood-shaped heat conducting element 85 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 arranged laterally offset radially 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. 4 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 area 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. This provides an optimal geometry that has the following advantages for the has precise control of the heating power or the temperature, in particular in frying operations in pans 6 parked on the hob plate 3.
  • 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 second 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 distance 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. 5 schematically a block diagram is shown, showing the main components of the hob.
  • 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.

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

Claims (10)

  1. Table de cuisson comprenant une plaque de cuisson (3), en particulier en verre vitrocéramique, au-dessous de laquelle est disposé au moins un élément de chauffage (5), pour le réchauffement d'un récipient de cuisson pouvant être déposé sur la plaque de cuisson (3), et une sonde de température (29) pour l'enregistrement de la température de la plaque de cuisson (3), laquelle sonde de température (29) palpe à l'intérieur de l'élément de chauffage (5) la température du côté inférieur de la plaque de cuisson (3) et est reliée à une unité de commande (101) pour la commande de la puissance de chauffage de l'élément de chauffage (5), la sonde de température (29) étant reliée à un élément (25 ; 85) thermoconducteur, qui est en liaison thermoconductrice avec le côté inférieur de la plaque de cuisson (3), et en ce que l'élément (25 ; 85) recouvre complètement la sonde de température (29) vers le haut en direction de la plaque de cuisson (3), caractérisée en ce que l'élément (25 ; 85) est mis à la terre à l'extérieur de l'élément de chauffage (5) et l'élément (25) présente une seconde partie de raccordement (49), à laquelle est raccordée une ligne de mise à la terre (51) de l'élément (25).
  2. Table de cuisson selon la revendication 1, caractérisée en ce que la sonde de température (29) et l'élément (25 ; 85) sont protégés au moyen de matériau isolant (21) contre le rayonnement thermique du moyen de chauffage (15).
  3. Table de cuisson selon la revendication 1, caractérisée en ce que l'élément (25 ; 85) couvre des arrivées (30) électriques de la sonde de température (29) vers le haut en direction de la plaque de cuisson (3).
  4. Table de cuisson selon l'une quelconque des revendications précédentes, en particulier selon la revendication 2, caractérisée en ce que l'élément (25 ; 85) est conçu à peu près en forme de capot au moins dans la zone de la sonde de température (29) et présente alors une paroi supérieure et des parois (31, 35) latérales semblables à un tablier.
  5. Table de cuisson selon la revendication 4, caractérisée en ce que le capot (27 ; 87) est fermé au moins en partie côté sol.
  6. Table de cuisson selon la revendication 4 ou 5, caractérisée en ce que le matériau du capot (27 ; 87) est de l'acier X7 ou de l'acier X10.
  7. Table de cuisson selon la revendication 1, caractérisée en ce que la valeur de la résistance ohmique de l'élément (25 ; 85) est inférieure à environ 0,1 Ohm.
  8. Table de cuisson selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément (25) présente une première partie de raccordement (47) à laquelle sont reliées les lignes (30) électriques de la sonde de température (29).
  9. Table de cuisson selon l'une quelconque des revendications précédentes, caractérisée en ce que la sonde de température (29) est fixée coulée dans l'élément (25 ; 85) sur celui-ci.
  10. Table de cuisson selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément (25 ; 85) est conçu comme élément de ressort et est appuyé dans la zone de la sonde de température (29) contre le côté inférieur de la plaque de cuisson (3).
EP01921276A 2000-02-16 2001-02-08 Espace de cuisson a sonde pyrometrique Expired - Lifetime EP1260120B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10006953A DE10006953A1 (de) 2000-02-16 2000-02-16 Kochfeld mit Temperaturfühler
DE10006953 2000-02-16
PCT/EP2001/001384 WO2001062047A1 (fr) 2000-02-16 2001-02-08 Espace de cuisson a sonde pyrometrique

Publications (2)

Publication Number Publication Date
EP1260120A1 EP1260120A1 (fr) 2002-11-27
EP1260120B1 true EP1260120B1 (fr) 2008-07-09

Family

ID=7631125

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01921276A Expired - Lifetime EP1260120B1 (fr) 2000-02-16 2001-02-08 Espace de cuisson a sonde pyrometrique

Country Status (5)

Country Link
US (1) US20030042246A1 (fr)
EP (1) EP1260120B1 (fr)
AT (1) ATE400981T1 (fr)
DE (2) DE10006953A1 (fr)
WO (1) WO2001062047A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2859867B1 (fr) * 2003-09-16 2006-04-14 Frima Sa Element chauffant pour appareil de cuisson
DE102004053012B4 (de) * 2004-10-29 2023-01-12 BSH Hausgeräte GmbH Kochfeld mit einem Temperatursensor
DE102005040041B3 (de) * 2005-08-23 2006-10-19 Miele & Cie. Kg Glaskeramikkochfeld mit wenigstens einem Kochfeldbereich
SE529587C2 (sv) * 2005-10-21 2007-09-25 Hans-Goeran Aahlander En matlagningsanordning med sensorinrättning och ett matlagningskärl
US20150265089A1 (en) * 2014-03-19 2015-09-24 Zoppas Industries de Mexico SA de CV Surface Unit for Heating
CA2943281A1 (fr) * 2014-03-19 2015-09-24 Zoppas Industries de Mexico Unite de surface chauffante a haute performance
ES1135492Y (es) * 2014-12-11 2015-04-13 Eika S Coop Foco radiante adaptado a una encimera de cocción
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
US10757762B2 (en) * 2017-12-01 2020-08-25 Haier Us Appliance Solutions, Inc. Electric cooktop appliance

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622754A (en) * 1970-07-24 1971-11-23 Gen Electric Glass plate surface heating unit with even temperature distribution
DE2747652C2 (de) * 1977-10-24 1984-04-05 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Elektrokochgerät
GB2071969B (en) * 1980-03-05 1983-09-21 Kenwood Mfg Co Ltd Cooking apparatus
US4447710A (en) * 1981-08-08 1984-05-08 Micropore International Limited Electric cookers incorporating radiant heaters
DE3703768A1 (de) * 1987-02-07 1988-08-18 Fissler Gmbh Vorrichtung zum erfassen der temperatur einer mittels heizwicklungen oder halogenlampen aufgeheizten glaskeramikplatte
US4816647A (en) * 1987-11-13 1989-03-28 General Electric Company Power control for appliance having a glass ceramic cooking surface
GB2335541A (en) * 1998-03-20 1999-09-22 Ceramaspeed Ltd Electric heater comprising a temperature sensing and limiting arrangement

Also Published As

Publication number Publication date
ATE400981T1 (de) 2008-07-15
EP1260120A1 (fr) 2002-11-27
US20030042246A1 (en) 2003-03-06
DE50114094D1 (de) 2008-08-21
DE10006953A1 (de) 2001-08-23
WO2001062047A1 (fr) 2001-08-23

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