EP0288915A2 - Radiateur à rayonnement électrique pour chauffer une plaque, en particulier une plaque vitrocéramique - Google Patents

Radiateur à rayonnement électrique pour chauffer une plaque, en particulier une plaque vitrocéramique Download PDF

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Publication number
EP0288915A2
EP0288915A2 EP88106444A EP88106444A EP0288915A2 EP 0288915 A2 EP0288915 A2 EP 0288915A2 EP 88106444 A EP88106444 A EP 88106444A EP 88106444 A EP88106444 A EP 88106444A EP 0288915 A2 EP0288915 A2 EP 0288915A2
Authority
EP
European Patent Office
Prior art keywords
temperature sensor
plate
radiant heater
insulating body
spacer
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
EP88106444A
Other languages
German (de)
English (en)
Other versions
EP0288915B2 (fr
EP0288915B1 (fr
EP0288915A3 (en
Inventor
Gerhard Gössler
Eugen Wilde
Robert Kicherer
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 Gerate Blanc und Fischer 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
Family has litigation
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Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Publication of EP0288915A2 publication Critical patent/EP0288915A2/fr
Publication of EP0288915A3 publication Critical patent/EP0288915A3/de
Application granted granted Critical
Publication of EP0288915B1 publication Critical patent/EP0288915B1/fr
Publication of EP0288915B2 publication Critical patent/EP0288915B2/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
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
    • 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
    • H05B2213/04—Heating plates with overheat protection means

Definitions

  • the invention relates to an electric radiant heater for heating a plate, in particular a glass ceramic plate according to the preamble of claim 1.
  • Such radiant heaters usually have a temperature sensor, the outer tube of which consists of an insulating material, in particular quartz or quartz glass. It is either itself included in the expansion system of the sensor, in which it forms a tube with a low expansion coefficient, in which there is a tension rod with a higher expansion coefficient, or it is pushed onto an expansion tube. It is necessary to ensure the necessary air or creepage distances in the space between the heating resistors and the plate through which the temperature sensor passes. It should be noted that glass ceramic plates become electrically conductive at working temperature, so that the necessary insulation distances must be observed here.
  • quartz glass tubes are not only relatively expensive, but also fragile and require special measures when mounting them on the radiant heater.
  • the object of the invention is therefore to provide an electric radiant heater in which the self-insulation of the temperature sensor can be dispensed with.
  • This object is achieved according to the invention by at least one spacer to maintain a minimum distance between the insulating body or the heating resistors arranged thereon and the temperature sensor or the plate.
  • the sensor tube which can preferably be metallic and possibly also be grounded, and the heating resistors. It has been determined in tests that the most significant danger that a predetermined air gap could possibly be undershot arises from the fact that the insulating body, which can have two layers, bulges upwards during continuous operation and thus brings the heating resistors closer to the sensor tube. This is avoided with certainty by the spacers.
  • the relatively stiff sensor tube ensures that the insulating body remains flat. The spacers do not need to be in constant contact with the temperature sensor. Rather, there can be a certain distance if it is ensured that the desired minimum distance is still present when the spacers are in contact. This minimum distance can be, for example, 3 mm, while the total air distances, including the distance of the temperature sensor from the plate, should be approximately 8 mm.
  • the spacer can preferably be formed by at least one projection of the insulating body, which lies in particular in an unheated and central region of the radiant heater and can be formed in one piece with the material of the insulating body, for example when it is vacuum formed.
  • An embodiment with two projections spaced apart from one another in the central region is particularly preferred.
  • a spacer can be formed for contact with the underside of the plate. In this case, it keeps the distance between the plate and the insulating body constant, so that the insulating body cannot "grow" on the temperature sensor.
  • a combination of the two measures is also conceivable, for example in that a protrusion extending from the insulating body has a contact surface for the plate and a support for the temperature sensor. This can be done in the form of a staggered cam or a projection with a hole for the temperature sensor.
  • a further embodiment can be formed in that a spacer is pushed onto the temperature sensor, for example in the form of a round or square disk, which is provided for contact with the insulating body and / or on the plate. Due to the asymmetrical design of this plate, different distances from the underside of the glass ceramic plate and from the insulating body can also be maintained.
  • the previous temperature sensors had to be arranged very flexibly because of their sensitive quartz tubes and were preferably in the upwardly open slots of an otherwise peripheral edge of the insulating body and one vice versa inserting carrier shell and had play in these recesses in order to prevent any tension from occurring.
  • Due to the possibility of using a rigid metallic sensor the temperature sensor and thus the entire controller can now be mounted largely rigidly, for example by inserting it with its mostly somewhat tapered free end into a hole in the carrier shell that is closed towards the top, while the switch side can be firmly attached to the support shell of the radiant heater with a bracket.
  • the insulating edges can also be closed at the top and thus offer more complete insulation.
  • the temperature sensor can thus be inserted into relatively narrow holes in the edge and practically forms a seal to the outside.
  • FIGS 1 to 3 show a radiant heater 11, which is provided for heating a glass ceramic plate 12 of a hob or a stove.
  • the radiant heater is pressed against the underside of the plate 12 by spring elements, not shown.
  • It consists of a sheet metal carrier shell 13 with a bottom and a circumferential upstanding edge 14.
  • An insulating body 15 lies therein, which is underlaid with a further insulating layer 16. While the insulating body 15 is made of a relatively solid and high-temperature-resistant insulating material based on ceramic fibers in the vacuum suction process, the insulating layer 16 consists of an optimally insulating, but less solid insulating material, for example a bulk material made of microporous fumed silica.
  • the insulating body 15 is also bowl-shaped with a relatively thin bottom 19 and a peripheral edge 17 which protrudes slightly above the edge 14 of the sheet metal carrier shell and is pressed against the underside 18 of the plate 12 by the pressure springs.
  • Electrical heating resistors 20 in the form of wire coils are attached to the top of the base 19. In the present example, this is done by partially pressing the coils into the still moist molding of the insulating body 15.
  • the bottom has ribs 21 running in a star shape, into which the heating coils are pressed somewhat further, while they penetrate little into the insulating body. This creates a secure fixing of the heating coils that does not hinder the radiation.
  • any other type of fixing is possible, for example by means of putty or the like, and other insulating materials or configurations of the insulating body can also be used within the scope of the invention.
  • a temperature sensor 23 of a temperature switch 24 runs through the space 22 formed between the floor 19 with the heating resistors 20 arranged thereon and the underside of the plate 18 and the peripheral edge 17, said temperature sensor being a temperature limiter or a temperature protection switch which has to ensure that that the underside 18 of the plate 12 remains limited in temperature to a certain value because, for example, glass ceramic plates suffer permanent damage when overheated.
  • the switch head 25 of the temperature switch 24, which contains at least one snap switch and possibly a second contact as a signal contact for signaling the hot state of the plate, is fixed outside the insulating body on an angular holder 26 which is screwed to the carrier shell 13.
  • the temperature sensor 23 is elongated and rod-shaped.
  • the temperature switch It consists of a metal tube 27 in which a ceramic rod 28 is located (FIG. 3), which has a lower coefficient of thermal expansion than the metal tube, so that a snap switch can be actuated due to the difference in length in the switch head.
  • the outer tube 27 At the free end 29 of the temperature sensor 23, the outer tube 27 is tapered and provided with an internal thread, so that the switch can be adjusted via an adjusting screw 30 on which the ceramic rod 28 is supported.
  • This construction of the temperature switch is extremely simple and robust since the metal tube 27 can be largely firmly connected to the switch head 25 and also has no tendency to break.
  • the temperature sensor can therefore advantageously be permanently mounted on both ends, ie on the switch side by its fixed attachment to the switch head 25 and the holder 26 and at its free end 29 by inserting it into a suitable opening 31 in the edge 14 of the sheet metal carrier shell.
  • This opening 31 like the openings 32, can be circular openings in the edge 17 of the insulating body, which openings are closed towards the glass ceramic plate. This ensures that no unnecessary heat losses occur, and the temperature sensor is firmly attached to the radiant heater and contributes to its stiffening. Nevertheless, it can move somewhat longitudinally at its free end due to its length.
  • the temperature sensor runs through the space 22 such that it is at a distance a from the heating resistors and a distance b from the plate. If the diameter d of the temperature sensor 23 is added to this, the total distance c from the underside of the plate 12 is obtained.
  • the distance a must not be less than a certain minimum, and the total distance a + b must also not be less than a certain amount in order to comply with the safety regulations correspond to. Nevertheless, the distance c should be as small as possible, on the one hand to get the heating as close as possible to the glass ceramic plate and on the other hand to keep the total height or depth of the radiant heater as small as possible and to this extent the insulation by the insulating layers 15, 16 to make it as big as possible.
  • Fig. 2 shows that they are each in unheated areas 36, which are formed by an S-shaped loop of the double spiral, in which the heating resistors are placed.
  • Two heating resistors run parallel in the form of a spiral, which turns in the center and runs out parallel to the incoming spiral.
  • These protrusions can be quadrangular protrusions formed from the material of the insulating body when it is formed, which protrusions have a quadrangular or pyramidal or round or conical shape. Although they cover the underside of the temperature sensor over their length, this is even an advantage because it increases the power release during the heating process somewhat. Only one spacer 35 or even several could be provided, which are also provided at other locations on the temperature sensor, but two in the middle area, but at a distance from one another, have proven to be very advantageous.
  • the variant shown in Fig. 4 has the same construction a spacer 35a, which, like the spacer according to Figures 1 to 3, has a contact surface 37 for the temperature sensor 23, but additionally a contact surface 38, the underside 18 of the plate 12 is opposite and can be supported on this.
  • the spacer formed by the projection 35a thereby has approximately an L-shape. It can also be U-shaped.
  • the spacer 35b is not provided on the insulating body but on the temperature sensor and does not consist very much of one in the longitudinal direction of the temperature sensor strong disc that is pushed onto the temperature sensor. It also ensures the distance of the temperature sensor both from the insulating body 15 and from the plate 12, but could also provide only one or the other spacing or ensure different distances by a correspondingly one-sided design.
  • the temperature sensor does not require the additional quartz tube, it can be manufactured with a smaller diameter d, which in turn enables the overall height to be reduced. Rather, the sensor tube can be grounded, so that even in the event of a break the glass ceramic plate it lies as a protective earthed component over the heater and prevents, for example, that a "broken" cooking vessel is put under tension.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Surface Heating Bodies (AREA)
  • Control Of Resistance Heating (AREA)
EP88106444A 1987-05-01 1988-04-22 Radiateur à rayonnement électrique pour chauffer une plaque, en particulier une plaque vitrocéramique Expired - Lifetime EP0288915B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8706277U DE8706277U1 (fr) 1987-05-01 1987-05-01
DE8706277U 1987-05-01

Publications (4)

Publication Number Publication Date
EP0288915A2 true EP0288915A2 (fr) 1988-11-02
EP0288915A3 EP0288915A3 (en) 1989-01-04
EP0288915B1 EP0288915B1 (fr) 1994-06-22
EP0288915B2 EP0288915B2 (fr) 1998-11-11

Family

ID=6807587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106444A Expired - Lifetime EP0288915B2 (fr) 1987-05-01 1988-04-22 Radiateur à rayonnement électrique pour chauffer une plaque, en particulier une plaque vitrocéramique

Country Status (7)

Country Link
US (1) US4845340A (fr)
EP (1) EP0288915B2 (fr)
JP (1) JP2700463B2 (fr)
AT (1) ATE107831T1 (fr)
DE (2) DE8706277U1 (fr)
ES (1) ES2054727T5 (fr)
YU (1) YU46335B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0383718A2 (fr) * 1989-02-17 1990-08-22 Emerson Electric Co. Contrôle d'un élément de chauffage
EP0432470A2 (fr) * 1989-12-12 1991-06-19 Bosch-Siemens HausgerÀ¤te GmbH Pièce de connexion (protecteur) pour une plaque chauffante d'une cuisinière électrique
US5128516A (en) * 1989-02-17 1992-07-07 Therm-O-Disc, Incorporated Heating element control
EP0522345A1 (fr) * 1991-06-28 1993-01-13 Bosch-Siemens Hausgeräte GmbH Isolation de tension de réseau avec détecteurs au-dessous de plaques chauffantes vitrocéramiques.
EP1303169A1 (fr) * 2001-10-15 2003-04-16 Heraeus Sensor-Nite GmbH Capteur de température utilisant un élément sensible ainsi que son utilisation

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE68923181T2 (de) * 1988-05-27 1995-10-26 Ceramaspeed Ltd Elektrische Strahlungsheizgeräte.
US5177339A (en) * 1988-05-27 1993-01-05 Ceramaspeed Limited Radiant electric heaters
DE3828192A1 (de) * 1988-08-19 1990-02-22 Ego Elektro Blanc & Fischer Strahlheizkoerper sowie verfahren und vorrichtung zu seiner herstellung
DE4022292A1 (de) * 1990-07-15 1992-01-16 Ego Elektro Blanc & Fischer Elektrisches strahlungsheizelement
DE4109569A1 (de) * 1991-03-22 1992-09-24 Buchtal Gmbh Elektrische heizplatte
DE9108012U1 (fr) * 1991-06-28 1991-09-05 Bosch-Siemens Hausgeraete Gmbh, 8000 Muenchen, De
GB2260442B (en) * 1991-10-09 1995-06-07 Ceramaspeed Ltd Radiant heater incorporating a temperature control device
DE9113992U1 (fr) * 1991-11-12 1992-01-02 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen, De
US5796075A (en) * 1992-03-09 1998-08-18 E.G.O. Elektro-Gerate Blanc Und Fisher Gmbh & Co. Kg Heater, particularly for kitchen appliances
US5256860A (en) * 1993-01-22 1993-10-26 Therm-O-Disc, Incorporated Control for glass cooktops utilizing rod-shaped thermistor
GB2278237B (en) * 1993-05-21 1996-09-04 Ceramaspeed Ltd Thermal cut-out device
DE19846512A1 (de) * 1998-10-09 2000-04-13 Ego Elektro Geraetebau Gmbh Einbau eines Gehäuses einer Schalteinrichtung
DE10006954A1 (de) * 2000-02-16 2001-10-11 Bsh Bosch Siemens Hausgeraete Kochfeld mit Temperaturfühler
EP1187512B1 (fr) * 2000-09-07 2004-11-10 E.G.O. ELEKTRO-GERÄTEBAU GmbH Corps de chauffe à rayonnement destiné à être placé sous une plaque de cuisson, en particulier une plaque vitro-céramique
GB2372190B (en) * 2000-12-16 2005-02-09 Ceramaspeed Ltd Cooking appliance with radiant electric heater
GB0301164D0 (en) * 2003-01-18 2003-02-19 Ceramaspeed Ltd Temperature-responsive device
GB0616353D0 (en) * 2006-08-17 2006-09-27 Ceramaspeed Ltd Radiant electric heater
TW201227761A (en) 2010-12-28 2012-07-01 Du Pont Improved thick film resistive heater compositions comprising ag & ruo2, and methods of making same
RU2643413C1 (ru) * 2015-10-12 2018-02-01 Конинклейке Филипс Н.В. Блендер с температурным датчиком
US11448402B2 (en) 2016-12-07 2022-09-20 Eika S. Coop Radiant electric heater

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007037A1 (de) * 1980-02-26 1981-09-03 Ego Elektro Blanc & Fischer Glaskeramik-kochgeraet
DE3143692A1 (de) * 1981-11-04 1983-05-11 Ego Elektro Blanc & Fischer Strahlheizkoerper zur beheizung von koch- und waermeflaechen
EP0116861A1 (fr) * 1983-01-26 1984-08-29 E.G.O. Elektro-Geräte Blanc u. Fischer Corps de chauffe radiant électrique pour le chauffage de plaques de cuisson ou de plaques chaudes, en particulier plaques en vitro-céramique
WO1985001412A1 (fr) * 1983-09-10 1985-03-28 Micropore International Limited Dispositifs de coupure thermique pour appareils de chauffe par rayonnement
US4508961A (en) * 1982-03-02 1985-04-02 Micropore International Limited Electric radiant heater units for glass ceramic top cookers

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710076A (en) * 1972-02-17 1973-01-09 J Frazier Radiant surface-heater and temperature sensing assembly
SE7806238L (sv) * 1977-07-02 1979-01-03 Fischer Karl Elektriskt stralningsvermeelement, serskilt for glaskeramikkokhell
GR69904B (fr) * 1979-10-27 1982-07-20 Ego Elektro Blanc & Fischer
NZ196104A (en) * 1980-02-01 1984-08-24 Micropore International Ltd Cooker plate with twin element:thermal cut-out for one
DE3410442A1 (de) * 1983-09-17 1985-09-26 Ego Elektro Blanc & Fischer Temperaturfuehler, insbesondere fuer einen temperaturbegrenzer fuer eine glaskeramik-kocheinheit
DE8515560U1 (de) * 1985-05-25 1985-08-29 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Kochstellen-Beheizung
DE3519035A1 (de) * 1985-05-25 1986-11-27 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektro-kochplatte

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007037A1 (de) * 1980-02-26 1981-09-03 Ego Elektro Blanc & Fischer Glaskeramik-kochgeraet
DE3143692A1 (de) * 1981-11-04 1983-05-11 Ego Elektro Blanc & Fischer Strahlheizkoerper zur beheizung von koch- und waermeflaechen
US4508961A (en) * 1982-03-02 1985-04-02 Micropore International Limited Electric radiant heater units for glass ceramic top cookers
EP0116861A1 (fr) * 1983-01-26 1984-08-29 E.G.O. Elektro-Geräte Blanc u. Fischer Corps de chauffe radiant électrique pour le chauffage de plaques de cuisson ou de plaques chaudes, en particulier plaques en vitro-céramique
WO1985001412A1 (fr) * 1983-09-10 1985-03-28 Micropore International Limited Dispositifs de coupure thermique pour appareils de chauffe par rayonnement

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0383718A2 (fr) * 1989-02-17 1990-08-22 Emerson Electric Co. Contrôle d'un élément de chauffage
EP0383718A3 (fr) * 1989-02-17 1991-11-27 Emerson Electric Co. Contrôle d'un élément de chauffage
US5128516A (en) * 1989-02-17 1992-07-07 Therm-O-Disc, Incorporated Heating element control
EP0432470A2 (fr) * 1989-12-12 1991-06-19 Bosch-Siemens HausgerÀ¤te GmbH Pièce de connexion (protecteur) pour une plaque chauffante d'une cuisinière électrique
EP0432470A3 (en) * 1989-12-12 1992-12-23 Bosch-Siemens Hausgeraete Gmbh Connecting piece (protector) for a heating plate of an electric cooking range
EP0522345A1 (fr) * 1991-06-28 1993-01-13 Bosch-Siemens Hausgeräte GmbH Isolation de tension de réseau avec détecteurs au-dessous de plaques chauffantes vitrocéramiques.
EP1303169A1 (fr) * 2001-10-15 2003-04-16 Heraeus Sensor-Nite GmbH Capteur de température utilisant un élément sensible ainsi que son utilisation

Also Published As

Publication number Publication date
JPS63284788A (ja) 1988-11-22
DE3850297D1 (de) 1994-07-28
DE8706277U1 (fr) 1987-06-25
YU46335B (sh) 1993-05-28
YU87388A (en) 1990-08-31
ATE107831T1 (de) 1994-07-15
JP2700463B2 (ja) 1998-01-21
ES2054727T3 (es) 1994-08-16
EP0288915B2 (fr) 1998-11-11
EP0288915B1 (fr) 1994-06-22
ES2054727T5 (es) 1999-02-01
EP0288915A3 (en) 1989-01-04
US4845340A (en) 1989-07-04

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