EP0300548B1 - Elément chauffant radiant pour cuisinières - Google Patents

Elément chauffant radiant pour cuisinières Download PDF

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Publication number
EP0300548B1
EP0300548B1 EP88201451A EP88201451A EP0300548B1 EP 0300548 B1 EP0300548 B1 EP 0300548B1 EP 88201451 A EP88201451 A EP 88201451A EP 88201451 A EP88201451 A EP 88201451A EP 0300548 B1 EP0300548 B1 EP 0300548B1
Authority
EP
European Patent Office
Prior art keywords
reflector
heating element
radiant heating
element according
halogen lamp
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
EP88201451A
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German (de)
English (en)
Other versions
EP0300548A1 (fr
Inventor
Reinhard Dr.Rer.Nat. Kersten
Heinz Körver
Walter Dipl.-Ing. Braun
Alfred Dipl.-Ing. Mendler
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.)
Bauknecht Hausgeraete GmbH
Whirlpool Europe BV
Original Assignee
Bauknecht Hausgeraete GmbH
Whirlpool Europe BV
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6331453&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0300548(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bauknecht Hausgeraete GmbH, Whirlpool Europe BV filed Critical Bauknecht Hausgeraete GmbH
Priority to AT88201451T priority Critical patent/ATE93675T1/de
Publication of EP0300548A1 publication Critical patent/EP0300548A1/fr
Application granted granted Critical
Publication of EP0300548B1 publication Critical patent/EP0300548B1/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
    • 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
    • H05B3/744—Lamps as heat source, i.e. heating elements with protective gas envelope, e.g. halogen lamps

Definitions

  • the invention relates to a radiant heater for cooking appliances with a hotplate designed in particular as a glass ceramic plate, a concave reflector arranged at a distance from the hotplate and at least one halogen lamp arranged between the hotplate and the reflector, as for example from EP-A1-0 176 063 or known from EP-A1-0 176 027.
  • Such a radiant heater is e.g. through GB 2 154 405 A become known.
  • This known design shows a radiant heater for cooking appliances, one or more rod-shaped halogen lamps being assigned to the concave reflector in order to achieve a uniform distribution of the radiation intensity, the filaments of which may have a gradient which varies over their length.
  • an electric radiant heater has become known, to which two concave reflectors are assigned in such a way that they abut one another below the radiant heater to form a folded edge drawn up in the direction of this radiant heater. The rays coming from the heating element are thus reflected back past the heating element.
  • the embodiment described in this document is an electric radiant heater for heating the washing drum of a washing machine.
  • the raised crease edge of the reflector ensures that the rays emanating from the side of the radiator facing away from the drum are reflected in such a way that they hit the drum surface.
  • GB 2 137 060 A has disclosed a radiant heating cooking device in which the hotplate is opaque to light wavelengths (0.3 to 0.7 ⁇ m) and transparent to wavelengths of approximately 1 to 3 ⁇ m.
  • This known design shows a parabolic mirror shape with a lamp arranged in the focal point.
  • an electric cooking device with an upper plate made of highly heat-resistant glass-like material has become known, the plate having a plurality of heated hot plates which are formed by heating units attached below the plate.
  • the glass ceramic plate forms the actual hot plate of the electric cooking device.
  • the heating units contain tubular heating elements that are pressed onto the plate with a flattened side.
  • the heating unit has a carrier shell, which consists of a heat-conducting, relatively thick-walled material, such as cast aluminum.
  • the inner surface of the carrier shell is designed to be reflective, for example, by a corresponding surface treatment, while the outer surface is roughened and darkened, for example by coloring or anodizing.
  • the outer surface should be as large as possible and have the largest possible radiation absorption ratio or a small reflection ratio.
  • the portion of the total heat that flows away via the relatively large flattening and the glass ceramic plate as a result of heat conduction is very large.
  • the jacket of the heating elements helps to conduct the heat flowing from the heating wire to the underside upwards, ie into the area of the flattening.
  • the heat then radiated from the tubular heaters is then radiated back from the reflecting inner surface of the carrier shell.
  • the carrier shell thus essentially serves as Thermal insulation system, but not as an energy control system.
  • the heat transfer from the heating elements to the heating plate takes place primarily through heat conduction between the tubular heating elements and the heating plate. Only residual heat radiation is radiated back through the carrier shell.
  • the object of the invention is to simplify and improve a radiant heater mentioned at the outset with regard to the homogeneity of the radiation distribution, the heat distribution and the energy yield.
  • the design of the reflector according to the invention enables angles of incidence which are favorable for the reflection, by means of which the radiation emanating from the halogen lamp and incident on the reflector is essentially reflected in the regions of the hotplate which are further away from the halogen lamp.
  • the parabolic-like cylinder sections can have parabolic sections or sections formed from one or more additional elements of a higher order.
  • the reflected radiation thus affects those parts of the hotplate that are increasing due to the Distance from the halogen lamp can only be acted upon by a small proportion of the light emitted directly from the halogen lamp. This results in an essentially homogeneous radiation distribution over the hotplate and local overheating of the hotplate is avoided.
  • the elimination of overheated areas of the hotplate also means that excessive heating of the space underneath the hotplate, including the reflector, is avoided.
  • the use of complex components that are also resistant to very high temperatures is no longer necessary. This means that a simple, highly reflective aluminum reflector can be used, which could not withstand the heat load in the known radiant heaters.
  • the shape of the mirror with the raised crease edge results in angles of incidence such that the proportion of the radiation reflected on the halogen lamp, which can lead to overheating and thus impairment of the lamp life, is greatly reduced.
  • the hotplate is essentially transparent to radiation in the wavelength range from visible light to at least 4 microns results in a high proportion of the rays directly incident on the bottom of the vessel, and at the same time the undesired high heating of the hotplate is reduced.
  • the food to be cooked is therefore mainly due to absorption of the radiation from the halogen lamp by the vessel or, in the case of transparent vessels, directly by absorption by the food itself. Since the heat transfer is essentially not caused by heat conduction between the hotplate and the bottom of the vessel or over an air gap between the hotplate and the bottom of the vessel, there are no special requirements for the flatness of the bottom of the vessel.
  • the start of cooking takes place almost without inertia. Furthermore, due to the low radiation absorption by the hotplate, the residual heat that can be emitted by the hotplate after switching off the radiant heater is low, so that there is a comparatively small increase in the temperature of the cooked product after switching off the radiant heater.
  • a temperature sensor is arranged on the back of the reflector.
  • the output of the halogen lamp can thus be reduced or switched off completely. This results in effective protection, not only for the reflector, but for the entire radiant heater, since the heating of the reflector results from the amount of heat radiated by the halogen lamp and the hotplate.
  • two halogen lamps are arranged on a hotplate, and the reflector is symmetrical to a central plane lying between the two halogen lamps.
  • the symmetrical design also results in a homogeneity in the middle area between the two halogen lamps.
  • the regions arranged in one half of the reflector can have different cross-sectional shapes. The cross-sectional shapes of the areas adjoining each other on the plane of symmetry can be determined depending on the distance between the halogen lamps so that the most homogeneous radiation distribution results in the central area.
  • the aluminum reflector has a coating of higher emissivity on its rear side.
  • the resulting increased radiation prevents the reflector from overheating, so that the limit temperature of aluminum, which is approximately 420 °, is not exceeded.
  • the aluminum reflector is formed in one piece. Such reflectors are thus easy to manufacture and can be easily installed or removed in the radiant heater.
  • a blower device is assigned to the rear of the reflector, which can also be controllable via a temperature sensor.
  • the reflector can thus be cooled in a simple manner and thus protected against overheating.
  • the maximum distance between the hotplate and reflector is 20 mm, for example. This leads to a low overall height of the radiant heater and enables its installation in Low-height parts, such as worktops of kitchen equipment or appliances.
  • the hotplate is essentially opaque to radiation in the range of visible light, so that the proportion of the disturbing visible light emission is reduced with somewhat reduced permeability for the total radiation of the halogen lamp.
  • a further embodiment of the invention is that one or more halogen lamps of a radiant heater have a filament with an incline that varies over its length. As a result, the homogeneity of the radiation directed onto the hotplate can be increased over the length of the halogen lamp and thus of the radiant heater.
  • the radiant heater shown in FIG. 1, designated as a whole by 1, is arranged below a hotplate 2 in a housing part 3, for example a cooker (not shown).
  • the radiant heater 1 has a housing 4, not shown, which can be connected to the housing part 3 and has a base plate 5, from which an annular wall 6 extends in the direction of the hotplate 2, which at its end opposite the base plate 5 into an annular end wall 7 passes.
  • the end wall 7 lies essentially in a plane parallel to the one containing the base plate 5.
  • the housing 4 consisting of the base plate 5, the annular wall 6 and the annular end wall 7 can be produced in one piece, for example as a sheet metal part.
  • halogen lamps 8 are in opposite areas of the wall 6 to the annular End wall 7 open slot-shaped recesses 9 formed.
  • two halogen lamps 8 are arranged parallel to one another at a distance.
  • the halogen spotlights used are preferably optimized for maximum energy emission by radiation in the visible light range down to a wavelength of about 4 ⁇ m.
  • connection blocks 10 are connected to the annular wall 6 in the region of the elongated recesses, of which only one connection block 10 is shown in FIG. 1 for the sake of simplicity.
  • the connection block 10, which is connected to the annular wall 6 in a manner not shown, has a slot-shaped recess 11 which is open towards the annular end wall 7 and into which a contact part 12 of the halogen lamp 8 can be inserted.
  • An electrical connection to an electrical connection line 13 can be produced via the contact part 12 and the connection block 10 in a manner not shown.
  • a reflector 14 can be connected to the housing 4 and is assigned to each halogen lamp 8 has two regions 15, 16, which essentially have the shape of parabolic cylinder sections. At the edge regions of its long sides, the reflector 14 has flange-like projections 17 and one or more support ribs 18 extend from the reflector for support on the base plate 5.
  • the annular space between the annular end wall 7 and the underlying annular surface of the base plate 5 is included an insulation 19 filled, which has a recess adjacent to the annular end wall 7. Between the recess and the overlying part of the annular end wall 7, a receptacle 20 is formed for one of the flange-like projections 17.
  • the adjoining ends 21 ', 21 ⁇ of both areas 15, 16 have the smallest distance to the halo gene lamp 8 and run substantially parallel to the central axis.
  • the transition between the ends 21 ', 21 ⁇ can be formed in a manner not shown, for example. By a narrow area of convex curvature. With integrally formed reflectors, the ends 21 ', 21' can also merge into one another in the form of a folded edge.
  • the beam paths 22, 23 shown in FIG. 3 result for direct radiation directed from the halogen lamp 8 onto the hotplate 2 or the radiation reflected via the reflector 14 onto the hotplate 2.
  • the shape of the reflector 14 results in the somewhat simplified, substantially homogeneous intensity 24 of the radiation directed onto the hotplate 2, which is plotted somewhat simplified in FIG. 3.
  • the essentially homogeneous radiation intensity 24 is achieved because the rays 23 reflected by the reflector 14 are predominantly reflected in areas of the hotplate 2 which are distant from the halogen lamp 8 and are therefore only slightly exposed to direct radiation 22.
  • the filament pitch of the halogen lamps 8 can be varied over their length in a manner not shown. It has proven advantageous that the slope in the middle third of the Halogen lamps 8 is about 20% larger than in the end thirds that follow on both sides. Areas of high thermal load on the hotplate 2 are avoided by the essentially homogeneous radiation distribution 24.
  • the glass ceramic material for the hotplate 2 is such that it is transparent to radiation in the wavelength range from approximately visible light to 4 ⁇ m. It is thus avoided that a substantial amount of heat absorbed radiation energy is stored in the hotplate 2. On the one hand, this results in an essentially inertia-free start of cooking and, on the other hand, it avoids the fact that after switching off the radiant heater 1, heat can still be transferred to the food to a significant extent. Cooking material is thus heated predominantly by absorption of the radiation emitted by the halogen lamps 8 in the vessels containing the cooking material or, if these vessels are transparent, directly by absorption in the cooking material. In contrast to heating the vessel essentially through heat transfer, requirements regarding the flatness of the vessel bottoms therefore do not have to be made.
  • the emission from the hotplate 2 in the direction of the reflector 14 is likewise low. Because of the reduced heating of the reflector 14 compared to conventional radiant heaters, pure aluminum or specially anodized aluminum can be used, for example, to achieve a highly reflective surface. In order to further ensure that a permissible maximum temperature of the reflector 14, for example 450 ° C. in the case of aluminum, is not exceeded, the side of the reflector 14 facing away from the halogen lamp 8 can be covered with a coating Emission levels are provided, and this side of the reflector can also be cooled by a blower device, not shown.
  • that side of the reflector 14 which faces away from the halogen lamp 8 can be assigned a temperature sensor which, when a predeterminable temperature is reached, throttles the power of the halogen lamp 8 or switches it off entirely. This results in an effective overload protection, not only for the reflector 14 but for the entire radiant heater 1 and the hotplate 2, since the heat absorption by the reflector 14 is determined by the power of the halogen lamps 8 and the amount of heat absorbed by the hotplate 2.
  • the radiant heater can be designed with a small distance 25 between the hotplate 2 and the reflector 14 of approximately 20 mm and can be used in parts of low overall height such as worktops of kitchen equipment or appliances due to the small space requirement.

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

Claims (10)

  1. Elément chauffant radiant pour appareils de cuisson, comprenant une plaque de cuisson (2) constituée notamment par une plaque en vitrocéramique, un réflecteur concave (14) disposé à distance de la plaque de cuisson (2) et au moins une lampe à halogène (8) placée entre la plaque de cuisson (2) et le réflecteur,
    caractérisé en ce que
    a) deux zones (15, 16) du réflecteur (14) ayant essentiellement la forme de segments cylindriques paraboliques sont coordonées à chaque lampe à halogène (8) et se rejoignent avec formation d'une arête d'inflexion (21', 21'') relevée en direction de la lampe à halogène (8),
    b) la plaque de cuisson (2) est essentiellement transparente pour le rayonnement compris dans le domaine des longueurs d'onde allant de la lumière visible jusqu'à au moins 4 µm et
    c) le réflecteur (14) est en aluminium.
  2. Elément chauffant radiant selon la revendication 1, caractérisé en ce que deux lampes à halogène (8) sont coordonnées à une plaque de cuisson (2) et que le réflecteur (14) est de conformation symétrique.
  3. Elément chauffant radiant selon la revendication 1 ou 2, caractérisé en ce que le réflecteur (14) présente une surface hautement réflechissante sur le côté dirigé vers la lampe à halogène correspondante et présente un revêtement d'un pouvoir émissif plus élevé sur le côté opposé.
  4. Elément chauffant radiant selon une des revendications 1 à 3, caractérisé en ce que le réflecteur (14) est réalisé en une seule pièce.
  5. Elément chauffant radiant selon une des revendications 1 à 4, caractérisé en ce qu'un capteur de température est installé sur le côté du réflecteur (14) éloigné de la lampe à halogène (8).
  6. Elément chauffant radiant selon une des revendications 1 à 5, caractérisé en ce qu'un dispositif de ventilation est coordonné au côté du réflecteur (14) éloigné de la lampe a halogène (8).
  7. Elément chauffant radiant selon une des revendications 1 à 6, caractérisé en ce que la plaque de cuisson (2) est essentiellement opaque pour un rayonnement dans le domaine de la lumière visible.
  8. Elément chauffant radiant selon une des revendications 1 à 7, caractérisé en ce qu'une ou plusieurs lampes à halogène (8) comportent un filament dont le pas d'hélice varie dans le sens de leur longueur.
  9. Elément chauffant radiant selon une des revendications 1 à 8, caractérisé en ce que le réflecteur (14) est en aluminium extra-pur.
  10. Elément chauffant radiant selon une des revendications 1 à 8, caractérisé en ce que le réflecteur (14) est en aluminium à anodisation spéciale.
EP88201451A 1987-07-11 1988-07-08 Elément chauffant radiant pour cuisinières Expired - Lifetime EP0300548B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88201451T ATE93675T1 (de) 1987-07-11 1988-07-08 Strahlheizkoerper fuer kochgeraete.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3723077 1987-07-11
DE19873723077 DE3723077A1 (de) 1987-07-11 1987-07-11 Strahlheizkoerper fuer kochgeraete

Publications (2)

Publication Number Publication Date
EP0300548A1 EP0300548A1 (fr) 1989-01-25
EP0300548B1 true EP0300548B1 (fr) 1993-08-25

Family

ID=6331453

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88201451A Expired - Lifetime EP0300548B1 (fr) 1987-07-11 1988-07-08 Elément chauffant radiant pour cuisinières

Country Status (4)

Country Link
EP (1) EP0300548B1 (fr)
AT (1) ATE93675T1 (fr)
DE (2) DE3723077A1 (fr)
ES (1) ES2042712T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008096942A3 (fr) * 2007-02-07 2008-11-20 Lg Electronics Inc Cuisinière

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3842033A1 (de) * 1987-07-11 1990-07-05 Bauknecht Hausgeraete Strahlheizkoerper fuer kochgeraete
DE3917000C2 (de) * 1989-05-24 2000-10-26 Bsh Bosch Siemens Hausgeraete Strahlungsheizeinrichtung für Kochgeräte
DE3918621A1 (de) * 1989-06-07 1990-12-13 Bosch Siemens Hausgeraete Kochmulde fuer elektroherde, kochplatten oder dgl.
DE4203996A1 (de) * 1992-02-12 1993-08-19 Philips Patentverwaltung Strahlheizkoerper fuer ein kochgeraet
DE4221626C2 (de) * 1992-07-01 1994-06-16 Kernforschungsz Karlsruhe Infrarot-Strahlungsheizeinrichtung
GB2324692B (en) * 1997-04-01 2001-02-14 Ceramaspeed Ltd Electric heater
DE10203605A1 (de) * 2002-01-30 2003-07-31 Bsh Bosch Siemens Hausgeraete Lichtwellenofen mit elliptisch-parabolischem Lampenreflektor
DE10203610A1 (de) * 2002-01-30 2003-07-31 Bsh Bosch Siemens Hausgeraete Lichtwellenofen mit Strahlungslampen unterschiedlicher Farbtemperatur
KR20080073860A (ko) 2007-02-07 2008-08-12 엘지전자 주식회사 조리 기기용 히터 서포터 및 이를 이용한 조리 기기
CN101623071B (zh) * 2009-07-31 2012-10-03 九阳股份有限公司 一种豆浆机
CN103322506B (zh) * 2012-03-21 2016-08-03 海洋王照明科技股份有限公司 一种反射器及包括该反射器的灯具
DE102014008443B4 (de) * 2014-06-06 2018-04-12 E.G.O. Elektro-Gerätebau GmbH Induktionskochfeld

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EP0169643A1 (fr) * 1984-06-28 1986-01-29 THORN EMI Patents Limited Appareil de chauffage
EP0176063A1 (fr) * 1984-09-22 1986-04-02 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant à rayonnement pour appareils de cuisson

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EP0169643A1 (fr) * 1984-06-28 1986-01-29 THORN EMI Patents Limited Appareil de chauffage
EP0176063A1 (fr) * 1984-09-22 1986-04-02 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant à rayonnement pour appareils de cuisson
EP0176027A1 (fr) * 1984-09-22 1986-04-02 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant à rayons pour appareils de cuisson

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008096942A3 (fr) * 2007-02-07 2008-11-20 Lg Electronics Inc Cuisinière
US7956309B2 (en) 2007-02-07 2011-06-07 Lg Electronics Inc. Cooking apparatus

Also Published As

Publication number Publication date
DE3883455D1 (de) 1993-09-30
ATE93675T1 (de) 1993-09-15
ES2042712T3 (es) 1993-12-16
EP0300548A1 (fr) 1989-01-25
DE3723077C2 (fr) 1993-05-19
DE3723077A1 (de) 1989-01-19

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