EP0714223A2 - Corps de chauffe rayonnant - Google Patents

Corps de chauffe rayonnant Download PDF

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Publication number
EP0714223A2
EP0714223A2 EP95116539A EP95116539A EP0714223A2 EP 0714223 A2 EP0714223 A2 EP 0714223A2 EP 95116539 A EP95116539 A EP 95116539A EP 95116539 A EP95116539 A EP 95116539A EP 0714223 A2 EP0714223 A2 EP 0714223A2
Authority
EP
European Patent Office
Prior art keywords
heating
heating zone
radiant heater
basic
zone
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
EP95116539A
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German (de)
English (en)
Other versions
EP0714223A3 (fr
EP0714223B1 (fr
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
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Publication of EP0714223A2 publication Critical patent/EP0714223A2/fr
Publication of EP0714223A3 publication Critical patent/EP0714223A3/en
Application granted granted Critical
Publication of EP0714223B1 publication Critical patent/EP0714223B1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
    • H01H37/48—Thermally-sensitive members actuated due to expansion or contraction of a solid with extensible rigid rods or tubes
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H2037/326—Thermally-sensitive members with radiative heat transfer to the switch, e.g. special absorption surfaces

Definitions

  • the invention relates to a radiant heater for stoves, which includes hobs or other cooking facilities, with a flat, plate-shaped cooking surface, e.g. a glass ceramic cooktop.
  • the radiant heater has a base heating zone which is always heated during operation and at least one optional switch-on heating zone which is formally adapted to create a larger overall heating zone of the base heating zone.
  • Radiant radiators of this type are generally referred to as dual-circuit radiators.
  • the heating zones are provided in a carrier with insulation on which heating conductors are arranged. The entire heating zone is surrounded by a thermally insulating outer edge. When combined, the basic and additional heating zones have a greater total output than the basic heating zone alone.
  • a temperature limiter protrudes with an essentially rod-shaped sensor over at least one of the heating zones.
  • DE 27 29 930 A describes such a radiant heater, in which several depressions with heating conductors arranged therein are provided in a larger insulating body can. They are therefore thermally completely separated from each other by an insulating partition. The same is described in the later, revoked DE 30 04 187 C.
  • EP 0 103 741 B describes a radiant heater with two heating zones provided concentrically to one another, the middle one being provided as a heating zone. It is switched on for parboiling alone and has a much higher output than the radiator in continued cooking if both zones are connected in series.
  • the object of the invention is to provide a radiant heater with improved thermal uniformity of the heating zones.
  • this object is achieved in that the two heating zones, which are delimited from one another in terms of area, are arranged such that they radially overlap one another.
  • This separation of the two heating zones from one another can be formed, for example, by a rib, the height of which is at most half the distance between the insulation and the cooking surface. However, it could also be formed by a more or less wide delimitation zone without a particular increase in isolation. This measure will make the base heating zone, which is mostly on the inside not sharply demarcated in the direction of the auxiliary heating zone, but receives a relatively soft thermal transition. Above all, however, a cold zone is avoided in the area of the web that previously reached up to or shortly before the glass ceramic plate.
  • the uniform heating and the avoidance of cold spots improve the heat transfer to the cooking vessel when the entire heating zone is in operation.
  • the cold ring zone in earlier dual-circuit radiators with an intermediate web would be exactly at the point where the usually hollow, curved saucepan bases have the best thermal contact with the hotplate, namely at the edge.
  • the invention also this area is evenly heated, which improves heat transfer and also has a positive effect on the thermal load on the cookware.
  • the parboiling values (efficiency) of the entire radiant heater are also improved by the lower insulating body mass and the heat flow in the area of the intermediate edge. This is partly due to the fact that the intermediate wall between the two heating zones had to be made of a mechanically stronger insulating material, which has a larger mass and lower thermal insulating properties than the insulation surface now used in the area of the heating conductors, which is now continuous.
  • the total heating zone can thus be continuously and essentially continuously heated when the auxiliary heating zone is switched on.
  • Such dual-circuit radiant heaters are manufactured in various surface arrangements for their heating zones. There are those that e.g. have a circular basic heating zone and additional heating zones attached to it on one or both sides to create an elongated overall heating zone. Often, however, the two heating zones are also arranged concentrically with one another, with the basic heating zone taking the center. In the latter case in particular, a rod-shaped temperature sensor of a temperature limiter projects beyond both heating zones on at least one side. Since the temperature limiter is used to protect the glass ceramic plate against unacceptable overheating, it must be ensured that it ensures this both when the basic heating zone is operated alone and when the overall heating zone is operated, without restricting the output by switching off at too low a temperature.
  • a temperature limiter is already known from EP 0 141 923 B2, the sensor of which is compensated so that the Basic heating zone alone determines the sensor effect.
  • the sensor in the area of the activation heating zone is rendered ineffective with regard to the thermal expansion differences by using materials of the same or slightly higher expansion coefficients for an expansion sleeve and the rod lying in it.
  • the temperature sensor Due to the smooth transition from the basic heating zone to the additional heating zone, the temperature sensor is now heated over a larger section than that of the pure basic heating zone and thus ensures an early shutdown. This can be counteracted by compensation, ie mutual coordination of the expansion materials on the sensor or by shielding or additional heating of the sensor.
  • the switching path to open the contact of the temperature limiter must be regarded as constant in both operating states (single and double circuit operation).
  • the sections of the sensor that are acted upon are, however, not in relation to the respective heat application. In order to compensate for this, not only is zero compensation made, but slightly overcompensated by means of an inner rod with a slightly higher expansion.
  • a particularly advantageous embodiment is one in which the heating conductors are thin corrugated strips which are embedded in the insulation with spade-shaped feet which are preferably adapted to the corrugation.
  • To fasten a very quickly glowing radiator directly in a highly effective insulation which, for example, consists of compressed silica acid gel, which can be pyrolytically produced.
  • the advantages brought about by the invention have a particular effect in the case of such highly effective insulations and rapidly glowing radiant heaters.
  • FIG. 1 and 2 show an electric radiant heater 11 which is arranged below a glass ceramic cooktop 16 and is pressed against it from below by means of spring means (not shown). It rests on the underside of the cooking surface 16 with an edge 15 made of insulating material.
  • the radiant heater 11 contains an insulation 13 in a flat, shell-shaped sheet metal shell 12, which is composed of a generally plate-shaped molded body 14 and the edge 15.
  • the molded insulation body consists of a heat-resistant, thermally excellent insulating compressed bulk material made of pyrogenic silica.
  • the inner surface 50 of the edge 15 can be optically dark, for example by a coating or appropriate treatment. This could be reflective in the range of invisible infrared radiation and only absorbable in the wavelength range of visible light and emit it again as long-wave infrared.
  • the edge of the sheet metal shell 12 does not reach the glass ceramic plate 16.
  • the molded body 14 contains two flat, horizontal surface areas which are provided with heating conductors 18. Between them, a boundary 19 in the form of a circumferential projection or web is provided, which extends just as high as the edge 17 of the molded insulating body 14, but overall no more than half of the total distance above the surface 20 of the molded insulating body or the heating in the heated area protrudes upwards between this surface 20 and the underside of the glass ceramic plate 16. Its height can advantageously be between a quarter and half of the distance mentioned.
  • the delimitation 19 delimits, as can be seen from FIG. 1, a central basic heating zone 21 from a ring-shaped heating zone 22 surrounding it. Both are to be switched by a manually operated switch, not shown, so that either only the basic heating zone or the basic and auxiliary heating zone are switched on together.
  • a manually operated switch not shown
  • heating surfaces of different diameters are created, which, however, both have essentially the same power density and are intended to be operated and regulated or controlled in each case like an independent heating zone.
  • the control is usually done via a clocked circuit breaker, which feeds either only the basic heating zone 21 or the total heating zone 23, which from the parallel heating conductors 18 of both heating zones is formed.
  • the heating conductors consist of a thin corrugated band of heating conductor material and are free-radiating, i.e. arranged on the surface 20 of the insulation molded body 15 without any encasing or shielding from the atmosphere. They have projections or feet directed downwards at intervals, which penetrate into the material of the molded body 15. These feet are at least partially arranged in the region of the wave curvature and bent in accordance with the corrugation, so that they have an arched spade shape which, despite the small thickness and rigidity of the heating conductor material, can penetrate into the surface 20 and be fixed therein.
  • the heating conductor tape protrudes vertically from the surface.
  • the heating-up time of the heating conductor can be shortened very much for a given surface temperature and can be of the order of three seconds.
  • This heating conductor arrangement is described in detail in DE 93 13 218 U, to which reference is made here and which is incorporated by reference into the disclosure of the present application.
  • the connection and arrangement of the heating conductors 18 are as follows:
  • the heating conductors of the auxiliary heating zone 22 run from a connecting lug 24 of a connecting block 25 to a turning point 26 on one of the main axes 27 of the circular heating element, reverse there by 180 ° and run back over half a circle until they reach a turning point on the other side of this main axis.
  • the heating conductor 18 crosses the main axis in order to also lay five parallel paths on the other side (bottom in FIG. 1). Then he is with a contact 28 connected to the switch head 29 of a temperature limiter 30.
  • the heating conductor runs on a path 31 parallel to the axis 27 to the innermost heating conductor path 32, which surrounds a central projection 33 of the molded insulating body 14.
  • the loop-shaped turns are laid out so that they cover almost the entire circumference before they turn around at turning points 26. There they leave an area around axis 27 on one side of the basic heating zone largely free of heating conductors. In this area, however, the heating conductor track 31 runs parallel to the axis 27.
  • the outer turn of the heating conductor 18 adjacent to the delimitation 19 runs parallel to the axis 27 and to the heating conductor track 31 over the connection heating zone 22 and from there parallel to the outer edge 15 to a second contact tab 34 of the connecting block 25.
  • the connections are therefore in the area of the outer edge 15 or the molded body edge 17 is provided and the heating conductors are guided directly to them. If it is not desired that e.g. If heat is generated in the area of the heating conductor track 31, the heating conductor track could be made of thicker or better conductive material there or could be formed without corrugation.
  • the delimitation rib 19 has an exit gate 35 in the region of the axis 27 on the side facing the switch head 29 in order to allow the heating conductors to pass through.
  • the temperature limiter 30 has a rod-shaped sensor 36, which protrudes from the switch head along the axis 27 over the activation heating zone and the basic heating zone. It ends in the area of delimitation 19 before it would cross the auxiliary heating zone for the second time. In the area of the auxiliary heating zone 22 and in the area of the basic heating zone 21 near the switch head, it runs between the respective turning points 26 in a apart from the parallel heating conductor tracks 31, areas 37, 38 free of heating conductors.
  • the temperature limiter consists of a metallic sensor tube, e.g. made of stainless steel, which has a greater specific thermal expansion than a rod 39 therein, e.g. made of ceramic (steatite) or the like.
  • the expansion differences between these materials lead to the actuation of two contacts housed in the switch head 29, one of which is the actual temperature limiter contact, which is at a temperature in the order of 600 ° to 700 ° Celsius on the underside the glass ceramic cooktop 16 switches off the heating in order to avoid damage to the glass ceramic.
  • Another contact is set to significantly lower temperatures (below 100 ° Celsius) in order to indicate the hot state of the hotplate via a signal lamp or the like.
  • the sensor is at a distance from the surface 20 of the molded insulating body and the heating conductors. It rests on the central projection 33, preferably under a certain pretension, so that it fixes its exact position for heating as well as for the glass ceramic and, on the other hand, it also holds down the central region of the molded insulating body.
  • the temperature sensor is so compensates for the fact that it is essentially temperature sensitive in the area of the base heating zone 21.
  • the ceramic rod 39 which serves as a standard for comparison with the expanding outer sleeve 41, is limited to the region of the base heating zone 21. It ends at a point 42, which is approximately above the boundary 19, possibly offset somewhat from the auxiliary heating zone, in order to prevent a slightly lower temperature level in the edge region of the basic heating zone due to radiation to the side when the basic heating zone is operated only when the higher temperature than when operating both heating zones together.
  • This end point 42 of the ceramic rod 39 is followed by an inner rod 43, which consists of a material that corresponds to the sleeve material with regard to the thermal expansion under the given circumstances and preferably has a somewhat higher thermal expansion behavior, for example a rod made of stainless steel. This transmits the movement resulting from the relative expansion to the switches located in the switch head 29.
  • This compensation can thus bring about counter- or overcompensation, in that the rod 43 causes a greater expansion than the corresponding section of the sleeve.
  • the fact that the heating conductor track 31 in the area of the sensor also extends beyond the switch-on heating zone means that the conditions for the temperature sensor are similar when used alone or when interconnected.
  • the partial suspension of the heating of the auxiliary heating zone in the area 38 which the temperature sensor crosses can also contribute to this. It would also be possible e.g. through openings in the outer tube 41 to accelerate the effectiveness of the counter-compensation section 43.
  • the insulating molded body 14 has recesses on its underside which the projections correspond approximately to the opposite side. This not only ensures the most uniform density possible during pressing, but also creates an inexpensive stacking option for shipping and storing the preformed insulating body 14.
  • the radiant heater 11 works as follows: The user selects the size of the radiator, for example by means of an adjustment button, in accordance with the size of a cooking vessel 44 which stands and sets on the glass ceramic plate 16, possibly by means of the same setting element, the desired power (relative duty cycle) on the clocking power control device .
  • the cooking vessel should be slightly larger than the actual heating zone.
  • the most important area 45 for heat transfer in the area of the outer circumference of the cooking vessel usually comes to be approximately above the boundary 19.
  • the heating conductor 18 glows very quickly and irradiates the underside of the glass ceramic plate and through it therethrough the cooking vessel 44.
  • the glass ceramic plate has a certain permeability for the radiation occurring, some of it is also converted into heat in the glass ceramic plate, which penetrates into the cooking vessel 44 as contact heat. It can now be seen that in the embodiments according to FIGS. 1 to 4 in the area of the delimitation 19 there is no cold zone on the glass ceramic plate 16, which would otherwise lie in the area 45, where due to the usually negatively curved shape of the cooking vessel best heat transfer would be expected.
  • the part of the temperature sensor lying above this basic heating zone is heated.
  • the greater expansion of the outer sleeve 21 of the temperature sensor 36 results in a corresponding expansion difference, so that the heating is switched off at the set limiting temperature.
  • An advantage of the invention is that the temperature limitation due to the soft transition is less sensitive to the power distribution of the basic / additional heating zone.
  • Sensor for pot detection i.e. a switch-on and switch-off device dependent on the installation of a cooking vessel 44 on the hotplate could be arranged on projections in the delimitation zone without interrupting the thermally balanced total heating surface.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Resistance Heating (AREA)
  • Electric Ovens (AREA)
EP95116539A 1994-10-28 1995-10-20 Corps de chauffe rayonnant Expired - Lifetime EP0714223B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4438648 1994-10-28
DE4438648A DE4438648A1 (de) 1994-10-28 1994-10-28 Strahlungsheizkörper

Publications (3)

Publication Number Publication Date
EP0714223A2 true EP0714223A2 (fr) 1996-05-29
EP0714223A3 EP0714223A3 (fr) 1996-07-10
EP0714223B1 EP0714223B1 (fr) 2001-02-21

Family

ID=6531984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95116539A Expired - Lifetime EP0714223B1 (fr) 1994-10-28 1995-10-20 Corps de chauffe rayonnant

Country Status (4)

Country Link
EP (1) EP0714223B1 (fr)
AT (1) ATE199295T1 (fr)
DE (2) DE4438648A1 (fr)
ES (1) ES2156177T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004058473B4 (de) * 2004-11-24 2007-09-13 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung, insbesondere Strahlungsheizkörper
GB0608522D0 (en) * 2006-04-29 2006-06-07 Ceramaspeed Ltd Arrangement of radiant electric heaters
DE102007018085A1 (de) * 2007-04-17 2008-10-23 BSH Bosch und Siemens Hausgeräte GmbH Kochfeld, insbesondere Glaskeramikkochfeld

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2729930A1 (de) 1977-07-02 1979-01-11 Karl Fischer Strahlungs-heizeinheit fuer glaskeramik-elektrokochgeraete
DE3004187C2 (de) 1979-02-07 1983-10-20 Micropore International Ltd., Droitwich, Worcestershire Strahlungsheizer für Herde mit ebenen Kochplatten
EP0141923B1 (fr) 1983-09-17 1988-05-25 E.G.O. Elektrogeräte AG Limiteur de température pour plaques de cuisson en vitro-céramique
EP0103741B1 (fr) 1982-09-16 1988-11-17 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant, en particulier élément chauffant radiant pour le chauffage de plaques en céramique

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251716A (en) * 1978-11-30 1981-02-17 General Electric Company Self-cleaning glass-ceramic surface cooking unit
GB2087698B (en) * 1980-11-17 1984-03-28 Micropore International Ltd Electric radiant heater unit
GB2116010B (en) * 1982-03-02 1985-11-27 Micropore International Ltd Electric radiant heater units for use in glass ceramic top cookers
AT376540B (de) * 1983-01-05 1984-11-26 Electrovac Vorrichtung zur regelung bzw. begrenzung wenigstens eines temperaturwertes bzw. eines temperaturbereiches von strahlungs- bzw. kontaktheizkoerpern von elektrischen kochgeraeten
IT8320567V0 (it) * 1983-01-21 1983-01-21 I R C A Ind Resistenze Corazza Elemento riscaldante elettrico, in particolare per piani lisci di cottura.
DE3705260A1 (de) * 1987-02-19 1988-09-01 Ego Elektro Blanc & Fischer Temperaturbegrenzer
DE3812490A1 (de) * 1988-04-15 1989-11-02 Ego Elektro Blanc & Fischer Strahlheizkoerper
DE3908600C2 (de) * 1989-03-16 1997-01-30 Ako Werke Gmbh & Co Strahlungsheizeinrichtung
DE9113992U1 (fr) * 1991-11-12 1992-01-02 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen, De
GB2263770B (en) * 1992-01-23 1994-11-02 Ceramaspeed Ltd Device for controlling or limiting temperature in an electric cooking appliance
DE4229375C2 (de) * 1992-09-03 2000-05-04 Ego Elektro Blanc & Fischer Strahlungs-Heizkörper
DE9313218U1 (de) * 1992-09-03 1993-10-28 Ego Elektro Blanc & Fischer Heizer, insbesondere für Küchengeräte

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2729930A1 (de) 1977-07-02 1979-01-11 Karl Fischer Strahlungs-heizeinheit fuer glaskeramik-elektrokochgeraete
DE3004187C2 (de) 1979-02-07 1983-10-20 Micropore International Ltd., Droitwich, Worcestershire Strahlungsheizer für Herde mit ebenen Kochplatten
EP0103741B1 (fr) 1982-09-16 1988-11-17 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant, en particulier élément chauffant radiant pour le chauffage de plaques en céramique
EP0141923B1 (fr) 1983-09-17 1988-05-25 E.G.O. Elektrogeräte AG Limiteur de température pour plaques de cuisson en vitro-céramique

Also Published As

Publication number Publication date
DE4438648A1 (de) 1996-05-02
ES2156177T3 (es) 2001-06-16
EP0714223A3 (fr) 1996-07-10
ATE199295T1 (de) 2001-03-15
DE59509035D1 (de) 2001-03-29
EP0714223B1 (fr) 2001-02-21

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