GB2115259A - Electric heating means in a cooking plate - Google Patents

Electric heating means in a cooking plate Download PDF

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Publication number
GB2115259A
GB2115259A GB08235826A GB8235826A GB2115259A GB 2115259 A GB2115259 A GB 2115259A GB 08235826 A GB08235826 A GB 08235826A GB 8235826 A GB8235826 A GB 8235826A GB 2115259 A GB2115259 A GB 2115259A
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United Kingdom
Prior art keywords
cooking
heating element
heating
winding
plate
Prior art date
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Granted
Application number
GB08235826A
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GB2115259B (en
Inventor
Heinz Kotsch
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Individual
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Individual
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Publication of GB2115259A publication Critical patent/GB2115259A/en
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Publication of GB2115259B publication Critical patent/GB2115259B/en
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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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/037—Heaters with zones of different power density
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Cookers (AREA)
  • Baking, Grill, Roasting (AREA)
  • Resistance Heating (AREA)
  • Surface Heating Bodies (AREA)
  • Table Devices Or Equipment (AREA)

Abstract

An electric cooking plate, for example a glass-ceramic hob, comprises a heater winding (1) which largely overlies a cooking zone. A temperature monitor (3) is disposed in this zone. In order to intensify the parboiling process, it is usual to operate with higher heating power, but this increased power is transferred to the cooking vessel only in the case of flat-bottomed vessels. In the case of a non-planar vessel bottom, the temperature monitor (3) may switch off the heating element before full transfer of its heat to the vessel and thereby interrupt the parboiling process. To avoid this, an additional heater winding (2), which provides a good heat transfer even in the case of a non-planar vessel bottom, is provided at the periphery of the cooking zone. <IMAGE>

Description

SPECIFICATION Electric heating means in a cooking plate The present invention relates to a cooking plate and has particular reference to electric heating means in such a plate.
In electric cooking plates, for example in the case of radiation heaters for glass ceramic hobs, there is usually provided a heater winding which largely overlies the cooking zone. Atemperature monitor is disposed in the cooking zone. In order to intensify the parboiling process, it is usual to operate with higher heating power. However,this increased heating power is transferred to the cooking vessel only in the case of planarvessel bottoms. In the case of a non-planar bottom, a temperature monitor interrupts the parboiling process.Thus, an increase in power consumption ofthesingle heaterwinding overlying the cooking zone from, for example, 1500 watts to 1800 watts, does not produce an intensification of the parboiling process, as the temperature monitor, extending for example transversely across the heater winding, by reason of this increased total power and ofthe poor heat transfer to the bowed pot bottom, rapidly switches offthe entire heating power and thereby interrupts the parboiling process. There is accordingly a need for improvement of cooking plates so that a parboiling process with increased heating power is possible substantially free of problems even in the case of non-planar pot bottoms.
According to the present invention there is provided a cooking plate defining a cooking zone and provided with a first eelectric heating element in the cooking zone and with at least one second electric heating element which at least atthe periphery ofthe cooking zone substantially encloses thefirst heating element.
In a preferred embodiment, the cooking plate, preferably a glass-ceramic cooker hob, is provided with a first heater winding overlying the cooking zone and at least one second heater winding which at least atthe periphery of the cooking place largely encloses thefirst heater winding, the second winding preferably being switchable on separatelyfrom the first winding.
Preferably, the second heating element comprises a single winding strand which extends at the edge of the cooking zone, thus at the place disposed immediately underneath a pot edge, where good contact of the pot with the cooking plate takes place.
The heating power ofthe first heating element is not increased in that case. Due to the good heatflowfrom the second heating element to the pot, no build-up of heat, which would lead to an undesired premature triggering of a temperature monitor, takes place in the peripheral region.
For preferance, the power consumption ofthe second heating element is substantially smallerthan the power consumption ofthe first element, preferably in the ratio of 1:5. Afavourable parboiling effect has resulted with a power rating of 1500 watts for the first heating element and of 300 wattsforthe second heating element in the case of a cooking zone diameter of 200 millimetres.
An embodiment of the present invention will now be more particularly described by way of example with reference to the accompanying drawing, which is a schematic plan view of electric heating means in cooking plate embodying the invention.
Referring now to the drawing, there is shown a radiation heater for a glass-ceramic cooker hob, which is arranged at a spacing underneath a cooking zone of a glass-ceramic plate (notshown). Atempera turemonitor3, intheform ofatemperature- dependent switch with a temperature sensor4 extending over the cooking zone, is disposed between the heater and the glass-ceramic plate and has the task of preventing impermissibly high heating of the plate. For this purpose, the temperature monitor3 is connected into the operating current circuit of the heater and switches offthe heater at a predetermined maximum temperature.
The radiation heater itself comprises two heater windingsl and 2, wherein the winding 1 largely overlies the cooking zone with the exception ofthe outermost peripheral region and is constructed for this purpose in the form oftwo semi-circular heating regions 5 and 6 with mutually concentric winding layers Sand 6'. This contiguous winding 1 is surrounded by an additional circular single-strand heater winding 2, which is disposed directly at the peripheral region ofthe cooking zone, i.e. so as to be directly underneath the rim of a cooking pot placed on the cooking plate. The electrical connecting points of thewindings 1 and 2 are designated by 7.1,7.2 and 7.3.In the case of the illustrated embodiment, it is presupposed that the cooking plate has a diameter of 200 millimetres. Appropriately, a power consumption L1 of 1500 watts is selected forthe winding 1 and a power consumption L2 of 300 watts for the heater winding 2. Together, the two windings 1 and 2 result in a heating power of 1800 watts. In the case ofthe illustrated embodiment, this heating power can be switched on through actuation of a single actuating device in the highest power seting (for example stage 9) ofthe actuating device and serves for rapid parboiling of cooking stock in the pot. After the parboiling process, the small heating power L1 can be switched off automatically.The outer circular winding 2 is disposed directly underneath the outer rim of the pot in such a mannerthan the heat emanating from this winding is efficiently transferred to the pot.
It is, of course, possible to structure the cooking zone, inclusive ofthe additional winding 2, in a shape other than circular.
1. A cooking plate defining a cooking zone and provided with a first electric heating element in the cooking zone and with at least one second electric heating elementwhich at least at the periphery ofthe cooking zone substantially encloses the first heating element.
2. A cooking plate as claimed in claim 1, the plate comprising a glass-ceramic cooker hob.
3. Acooking plate asclaimed in eitherclaim 1 or claim 2, comprising means for switching the or each second heating element independently ofthe first heating element.
4. A cooking plate as claimed in any one of the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (9)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Electric heating means in a cooking plate The present invention relates to a cooking plate and has particular reference to electric heating means in such a plate. In electric cooking plates, for example in the case of radiation heaters for glass ceramic hobs, there is usually provided a heater winding which largely overlies the cooking zone. Atemperature monitor is disposed in the cooking zone. In order to intensify the parboiling process, it is usual to operate with higher heating power. However,this increased heating power is transferred to the cooking vessel only in the case of planarvessel bottoms. In the case of a non-planar bottom, a temperature monitor interrupts the parboiling process.Thus, an increase in power consumption ofthesingle heaterwinding overlying the cooking zone from, for example, 1500 watts to 1800 watts, does not produce an intensification of the parboiling process, as the temperature monitor, extending for example transversely across the heater winding, by reason of this increased total power and ofthe poor heat transfer to the bowed pot bottom, rapidly switches offthe entire heating power and thereby interrupts the parboiling process. There is accordingly a need for improvement of cooking plates so that a parboiling process with increased heating power is possible substantially free of problems even in the case of non-planar pot bottoms. According to the present invention there is provided a cooking plate defining a cooking zone and provided with a first eelectric heating element in the cooking zone and with at least one second electric heating element which at least atthe periphery ofthe cooking zone substantially encloses thefirst heating element. In a preferred embodiment, the cooking plate, preferably a glass-ceramic cooker hob, is provided with a first heater winding overlying the cooking zone and at least one second heater winding which at least atthe periphery of the cooking place largely encloses thefirst heater winding, the second winding preferably being switchable on separatelyfrom the first winding. Preferably, the second heating element comprises a single winding strand which extends at the edge of the cooking zone, thus at the place disposed immediately underneath a pot edge, where good contact of the pot with the cooking plate takes place. The heating power ofthe first heating element is not increased in that case. Due to the good heatflowfrom the second heating element to the pot, no build-up of heat, which would lead to an undesired premature triggering of a temperature monitor, takes place in the peripheral region. For preferance, the power consumption ofthe second heating element is substantially smallerthan the power consumption ofthe first element, preferably in the ratio of 1:5. Afavourable parboiling effect has resulted with a power rating of 1500 watts for the first heating element and of 300 wattsforthe second heating element in the case of a cooking zone diameter of 200 millimetres. An embodiment of the present invention will now be more particularly described by way of example with reference to the accompanying drawing, which is a schematic plan view of electric heating means in cooking plate embodying the invention. Referring now to the drawing, there is shown a radiation heater for a glass-ceramic cooker hob, which is arranged at a spacing underneath a cooking zone of a glass-ceramic plate (notshown). Atempera turemonitor3, intheform ofatemperature- dependent switch with a temperature sensor4 extending over the cooking zone, is disposed between the heater and the glass-ceramic plate and has the task of preventing impermissibly high heating of the plate. For this purpose, the temperature monitor3 is connected into the operating current circuit of the heater and switches offthe heater at a predetermined maximum temperature. The radiation heater itself comprises two heater windingsl and 2, wherein the winding 1 largely overlies the cooking zone with the exception ofthe outermost peripheral region and is constructed for this purpose in the form oftwo semi-circular heating regions 5 and 6 with mutually concentric winding layers Sand 6'. This contiguous winding 1 is surrounded by an additional circular single-strand heater winding 2, which is disposed directly at the peripheral region ofthe cooking zone, i.e. so as to be directly underneath the rim of a cooking pot placed on the cooking plate. The electrical connecting points of thewindings 1 and 2 are designated by 7.1,7.2 and 7.3.In the case of the illustrated embodiment, it is presupposed that the cooking plate has a diameter of 200 millimetres. Appropriately, a power consumption L1 of 1500 watts is selected forthe winding 1 and a power consumption L2 of 300 watts for the heater winding 2. Together, the two windings 1 and 2 result in a heating power of 1800 watts. In the case ofthe illustrated embodiment, this heating power can be switched on through actuation of a single actuating device in the highest power seting (for example stage 9) ofthe actuating device and serves for rapid parboiling of cooking stock in the pot. After the parboiling process, the small heating power L1 can be switched off automatically.The outer circular winding 2 is disposed directly underneath the outer rim of the pot in such a mannerthan the heat emanating from this winding is efficiently transferred to the pot. It is, of course, possible to structure the cooking zone, inclusive ofthe additional winding 2, in a shape other than circular. CLAIMS
1. A cooking plate defining a cooking zone and provided with a first electric heating element in the cooking zone and with at least one second electric heating elementwhich at least at the periphery ofthe cooking zone substantially encloses the first heating element.
2. A cooking plate as claimed in claim 1, the plate comprising a glass-ceramic cooker hob.
3. Acooking plate asclaimed in eitherclaim 1 or claim 2, comprising means for switching the or each second heating element independently ofthe first heating element.
4. A cooking plate as claimed in any one of the preceding claims, wherein the current rating ofthe or each second heating element is substantially lower than that of the first heating element.
5. A cooking plate as claimed in claim 4, wherein the current rating of the or each second heating element is substantially one fifth of that ofthe first heating element.
6. A cooking element as claimed in any one ofthe preceding claims, comprising a single switching element operable to switch on all of the heating elements together.
7. A cooking element as claimed in claim 6, wherein the switching element is operable to switch on all of the heating elements together in the highest one of a plurality of power settings.
8. A cooking element as claimed in any one of the preceding claims, wherein the first heating element is arranged to form two substantially semicircular regions each comprising a plurality of substantially concentrically disposed portions of a winding, and said at least one second heating element is arranged to circularlysurround said heating regions.
9. A cooking elementsubstantially as hereinbefore described with reference to the accompanying drawings.
9. A cooking element substantially as hereinbefore described with reference to the accompanying drawings.
New claims or amendments to claims filed on 3113183.
Superseded claims 1 to 9.
New or amended claims: CLAIMS
1. A cooking plate defining a cooking zone and provided with a first electic heating element, which is arranged in the cooking zone and which is operable to selectively provide different rates of heating power, and with at least one second electric heating element, which is arranged in the cooking zone at the periphery thereof and which is selectably switchable into operation to provide additional heating powerto, in use, expedite attainment of boiling temperatures.
2. A cooking plate as claimed in claim 1, the plate comprising a glass-ceramic cooker hob.
3. Acooking plate as claimed in either claim 1 or claim 2, comprising means for switching the or each second heating element independently of the first heating element.
4. A cooking plate as claimed in any one of the preceding claims, wherein the current rating of the or each second heating element is substantially lower than that of the first heating element.
5. Acooking plate as claimed in claim 4, wherein the current rating of the or each second heating element is substantially one fifth of that of the first heating element.
6. Acooking elementasclaimed inanyoneofthe preceding claims, comprising a single switching element operable to switch on all ofthe heating elements together.
7. A cooking element as claimed in claim 6, wherein the switching element is operable to switch on all ofthe heating elements together in the highest one of a plurality of power settings.
8. Acookingelementasclaimed in anyoneofthe preceding claims, wherein the first heating element is arranged to form two substantially semicircular regions each comprising a plurality ofsubstantially concentrically disposed portions of a winding, and said at least one second heating element is arranged to circularly surround said heating regions.
GB08235826A 1982-02-19 1982-12-16 Electric heating means in a cooking plate Expired GB2115259B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19823206024 DE3206024A1 (en) 1982-02-19 1982-02-19 ELECTRIC COOKING PLATE, PREFERABLY GLASS-CERAMIC COOKER

Publications (2)

Publication Number Publication Date
GB2115259A true GB2115259A (en) 1983-09-01
GB2115259B GB2115259B (en) 1986-02-26

Family

ID=6156204

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08235826A Expired GB2115259B (en) 1982-02-19 1982-12-16 Electric heating means in a cooking plate

Country Status (9)

Country Link
JP (1) JPS58152517A (en)
BE (1) BE895807A (en)
CA (1) CA1210799A (en)
DE (1) DE3206024A1 (en)
FR (1) FR2522242B1 (en)
GB (1) GB2115259B (en)
IT (1) IT1161068B (en)
NL (1) NL8204819A (en)
SE (1) SE8300887L (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2560360A1 (en) * 1984-02-23 1985-08-30 Bosch Siemens Hausgeraete HEATING DEVICE FOR ELECTRICALLY HEATED RADIATION HEATING STATIONS
GB2186166A (en) * 1986-01-24 1987-08-05 Redring Electric Ltd Electric hobs and heating units therefor
EP0250880A3 (en) * 1986-07-03 1989-02-08 E.G.O. Elektro-Gerate Blanc U. Fischer Radiant heating element
AT402248B (en) * 1982-03-02 1997-03-25 Micropore International Ltd ELECTRIC RADIATION HEATING UNITS FOR USE IN COOKER WITH GLASS-CERAMIC COOKING SURFACES

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3335066A1 (en) * 1983-09-28 1985-04-04 Gaggenau-Werke Haus- Und Lufttechnik Gmbh, 7560 Gaggenau Built-in cooking area for a domestic cooker
JPS60139706A (en) * 1983-12-27 1985-07-24 Toho Titanium Co Ltd Olefin polymerization catalyst component
DE10307246A1 (en) * 2003-02-17 2004-08-26 E.G.O. Elektrogerätebau GmbH Heating device with two areas
DE102014208408A1 (en) 2014-05-06 2015-11-12 BSH Hausgeräte GmbH Radiator for a cooking appliance and cooking appliance, in particular hob
DE102014215776A1 (en) 2014-08-08 2016-02-11 BSH Hausgeräte GmbH Method for accelerating a cooking process, control device and cooking appliance therefor

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE614234C (en) * 1935-06-04 Ehrich & Graetz Akt Ges High-performance circular electric hotplate
CH191508A (en) * 1936-10-15 1937-06-30 Sauter Ag Electric hotplate and process for their manufacture.
DE962920C (en) * 1941-02-27 1957-05-02 Siemens Ag Electric heat conduction hotplate
DE2557133C3 (en) * 1975-12-18 1978-08-24 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Arrangement for power control of electric hotplates
SE8000898L (en) * 1979-02-07 1980-08-08 Micropore International Ltd DEVICE FOR DELETING COOKERS
DE2943477C2 (en) * 1979-10-27 1987-11-26 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen, De Control switch for hotplate or heat storage device - has rotary setting member also operating switch that connects in extra heating element
GB2080660B (en) * 1980-07-22 1983-10-12 Micropore International Ltd Electric radiant unit for a glass ceramic top cooker
GB2087698B (en) * 1980-11-17 1984-03-28 Micropore International Ltd Electric radiant heater unit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT402248B (en) * 1982-03-02 1997-03-25 Micropore International Ltd ELECTRIC RADIATION HEATING UNITS FOR USE IN COOKER WITH GLASS-CERAMIC COOKING SURFACES
FR2560360A1 (en) * 1984-02-23 1985-08-30 Bosch Siemens Hausgeraete HEATING DEVICE FOR ELECTRICALLY HEATED RADIATION HEATING STATIONS
GB2155289A (en) * 1984-02-23 1985-09-18 Bosch Siemens Hausgeraete Electric heating unit
GB2186166A (en) * 1986-01-24 1987-08-05 Redring Electric Ltd Electric hobs and heating units therefor
EP0250880A3 (en) * 1986-07-03 1989-02-08 E.G.O. Elektro-Gerate Blanc U. Fischer Radiant heating element

Also Published As

Publication number Publication date
SE8300887D0 (en) 1983-02-17
IT8319630A0 (en) 1983-02-17
DE3206024A1 (en) 1983-09-08
FR2522242B1 (en) 1986-11-14
IT1161068B (en) 1987-03-11
BE895807A (en) 1983-05-30
IT8319630A1 (en) 1984-09-17
CA1210799A (en) 1986-09-02
GB2115259B (en) 1986-02-26
JPS58152517A (en) 1983-09-10
FR2522242A1 (en) 1983-08-26
NL8204819A (en) 1983-09-16
SE8300887L (en) 1983-08-20

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PCNP Patent ceased through non-payment of renewal fee