EP0300548A1 - Elément chauffant radiant pour cuisinières - Google Patents

Elément chauffant radiant pour cuisinières Download PDF

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Publication number
EP0300548A1
EP0300548A1 EP88201451A EP88201451A EP0300548A1 EP 0300548 A1 EP0300548 A1 EP 0300548A1 EP 88201451 A EP88201451 A EP 88201451A EP 88201451 A EP88201451 A EP 88201451A EP 0300548 A1 EP0300548 A1 EP 0300548A1
Authority
EP
European Patent Office
Prior art keywords
reflector
radiant heater
hotplate
halogen lamp
heater according
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
EP88201451A
Other languages
German (de)
English (en)
Other versions
EP0300548B1 (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
Philips Gloeilampenfabrieken NV
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 Bauknecht Hausgeraete GmbH, Whirlpool Europe BV, Philips Gloeilampenfabrieken NV 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.
  • the overheating of the hotplate leads to considerable reheating after the cooking appliance has been switched off. Furthermore, the heat radiation emanating from the hotplate leads to a strong heating of the space below the hotplate, including the reflector. This necessitates the use of complex, temperature-resistant components and can be premature during operation Switch off through the built-in safety temperature controller.
  • EP A1 01 76 063 It is also known (EP A1 01 76 063) to arrange insulating supports at a distance from the halogen lamps, which have the shape of flat, arcuately delimited grooves in order to achieve a reflection of the radiation. It is also known (EP A1 01 76 027) to arrange light and dark radiators in radiant heaters for cooking appliances. A coating of titanium dioxide is applied to an insulating layer arranged under the light emitters in order to achieve a reflection of the radiation from the light emitters. In these embodiments, the intensity of the radiation incident on the hotplate is also inhomogeneous, so that the disadvantages mentioned are also present.
  • the invention has for its object to design a generic radiant heater so that it is simple and inexpensive to manufacture and leads to a homogeneous distribution of the radiation incident on the hotplate even with a small number of lamps.
  • each halogen lamp is assigned two regions of the reflector which are essentially in the form of parabolic-like cylinder sections.
  • each halogen lamp is assigned two regions of the reflector which are essentially in the form of parabolic cylinder sections, favorable angles of incidence are achieved for the reflection, through which the radiation emitted by the halogen lamp and incident on the reflector essentially falls into the regions of Hotplate is reflected, which are located further away from the halogen lamp.
  • the parabolic-like cylinder sections can have parabolic sections or sections formed in one or more additional members of a higher order.
  • the reflected radiation thus affects those parts of the hotplate which, due to the increasing distance from the halogen lamp, are only affected by a small proportion of the light emitted directly by 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 simple, highly reflective reflectors can be used that could not withstand the heat load in the known radiant heaters.
  • two halogen lamps are arranged on a hotplate and the reflector is symmetrical. With a small number of halogen lamps, this results in a very homogeneous radiation distribution on the hotplate.
  • the reflector is symmetrical to a central plane lying 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 reflector facing the halogen lamp has a highly reflective surface, so that there is good reflection. Due to the reduced heating of the reflector, e.g. Pure aluminum or specially anodized aluminum can be used.
  • the reflector has a coating of higher emissivity on the side opposite the highly reflective surface.
  • the resulting increased radiation prevents the reflector from overheating, so that limit temperatures, which for example are about 450 ° C. for aluminum, are not exceeded.
  • the reflector is formed in one piece. Reflectors are thus easy to manufacture and can be easily installed or removed from the radiant heater.
  • the adjoining ends of the parabolic-like cylinder sections can form a folded edge.
  • a temperature sensor is arranged on the side of the reflector facing away from the halogen lamp. As a result, when a predeterminable temperature is reached, the power of the halogen lamp can be reduced or it can be switched off completely.
  • the arrangement of the temperature sensor on the reflector provides effective protection not only for the reflector, but for the entire radiant heater, since the heating of the reflector results from the thermal energy radiated by the halogen lamp and the hotplate.
  • blower device is assigned to the side of the reflector facing away from the halogen lamp.
  • the blower device which can likewise be controllable via a temperature sensor, allows the reflector to be cooled or protected from overheating in a simple manner.
  • the maximum distance between the hotplate and reflector is approximately 20 mm. This leads to a low overall height of the radiant heater and enables it to be installed in parts of low height, such as worktops of kitchen equipment or appliances.
  • the hotplate is essentially transparent to radiation in the wavelength range from visible light to at least 4 ⁇ m. This transparency results in a high proportion of the rays directly hitting the bottom of the vessel and, at the same time, the undesired heating the hob is reduced.
  • the food to be cooked is therefore predominantly due to absorption of the radiation from the halogen lamp by the vessel or, in the case of transparent vessels, directly to absorption by the food itself. Since the heat is not transported by heat conduction between the hotplate and the bottom of the vessel or via 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 essentially 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 food after switching off the radiant heater.
  • the hotplate is essentially opaque to radiation in the visible light range, so that the proportion of the disruptive visible light emission is reduced with somewhat reduced permeability for the total radiation of the halogen lamp.
  • one or more halogen lamps of a radiant heater have a filament with an incline that varies over their length. With this arrangement, 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 output by radiation in the visible light range down to a wavelength of around 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 pe 8 has two regions 15, 16, which have essentially the shape of parabolic cylinder sections. On the edge regions of its long sides, the reflector 14 has flanges 17 bent over like flanges, and one or more supporting 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 height, such as worktops of kitchen equipment or appliances, due to the small space requirement.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Resistance Heating (AREA)
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
DE19873723077 DE3723077A1 (de) 1987-07-11 1987-07-11 Strahlheizkoerper fuer kochgeraete
DE3723077 1987-07-11

Publications (2)

Publication Number Publication Date
EP0300548A1 true EP0300548A1 (fr) 1989-01-25
EP0300548B1 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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401651A1 (fr) * 1989-06-07 1990-12-12 Bosch-Siemens HausgerÀ¤te GmbH Table de cuisson pour des cuisinières électriques, pour des plaques de cuisson et similaires
EP0556892A1 (fr) * 1992-02-12 1993-08-25 Philips Patentverwaltung GmbH Radiateur pour un appareil de cuisson
GB2324692A (en) * 1997-04-01 1998-10-28 Ceramaspeed Ltd IR heating lamp having different heating output zones
CN101623071A (zh) * 2009-07-31 2010-01-13 九阳股份有限公司 一种豆浆机
US8263909B2 (en) 2007-02-07 2012-09-11 Lg Electronics Inc. Cooking apparatus and heater supporter for the same
CN103322506A (zh) * 2012-03-21 2013-09-25 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

Families Citing this family (7)

* 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
DE4221626C2 (de) * 1992-07-01 1994-06-16 Kernforschungsz Karlsruhe Infrarot-Strahlungsheizeinrichtung
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
WO2008096942A2 (fr) 2007-02-07 2008-08-14 Lg Electronics Inc. Cuisinière
DE102014008443B4 (de) * 2014-06-06 2018-04-12 E.G.O. Elektro-Gerätebau GmbH Induktionskochfeld

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE511325C (de) * 1930-10-29 Walter Koenig Elektrische Heizplatte, unterhalb welcher ein Reflektor angeordnet ist
US3543002A (en) * 1968-02-20 1970-11-24 Milletron Inc Quartz heater pack
FR2138464A1 (fr) * 1971-05-26 1973-01-05 Scholtes Ets Eugen
US3733461A (en) * 1971-05-26 1973-05-15 Powell R Radiant heater
GB1368346A (en) * 1972-05-24 1974-09-25 Bondonio E Infrared lamps
DE2325775B1 (fr) * 1973-05-21 1974-10-03 Siemens Ag, 1000 Berlin Und 8000 Muenchen
FR2231281A7 (fr) * 1973-05-21 1974-12-20 Siemens Ag
GB2161348A (en) * 1984-06-09 1986-01-08 Micropore International Ltd Radiation heater reflector

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE543671A (fr) *
US3098922A (en) * 1962-03-21 1963-07-23 John J Paxton Domestic smoothing iron
US3355574A (en) * 1965-10-01 1967-11-28 Gen Motors Corp Electrical surface heater with plural lamps
DE1565798A1 (de) * 1966-04-15 1970-04-16 Siemens Elektrogeraete Gmbh Elektrischer Strahlungsheizkoerper
US3627986A (en) * 1969-10-06 1971-12-14 Tappan Co The Electric smooth top range
DE2205132C3 (de) * 1972-02-03 1980-09-04 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen Elektrokochgerät
FR2258594B1 (fr) * 1974-01-23 1977-09-23 Scholtes Ets Eugen
US4319125A (en) * 1979-07-20 1982-03-09 Prince Fred J Infra-red radiant heater system
GB2137060A (en) * 1983-03-25 1984-09-26 Gen Electric Radiant-Energy Heating and/or Cooking Apparatus
GB2154405B (en) * 1984-01-10 1987-07-01 Thorn Emi Domestic Appliances Heating apparatus
EP0169643B1 (fr) * 1984-06-28 1989-12-13 THORN EMI Patents Limited Appareil de chauffage
EP0176027B1 (fr) * 1984-09-22 1989-02-01 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant à rayons pour appareils de cuisson
US4605839A (en) * 1984-12-21 1986-08-12 Adolph Coors Company Dual parison heating reflector and method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE511325C (de) * 1930-10-29 Walter Koenig Elektrische Heizplatte, unterhalb welcher ein Reflektor angeordnet ist
US3543002A (en) * 1968-02-20 1970-11-24 Milletron Inc Quartz heater pack
FR2138464A1 (fr) * 1971-05-26 1973-01-05 Scholtes Ets Eugen
US3733461A (en) * 1971-05-26 1973-05-15 Powell R Radiant heater
GB1368346A (en) * 1972-05-24 1974-09-25 Bondonio E Infrared lamps
DE2325775B1 (fr) * 1973-05-21 1974-10-03 Siemens Ag, 1000 Berlin Und 8000 Muenchen
FR2231281A7 (fr) * 1973-05-21 1974-12-20 Siemens Ag
GB2161348A (en) * 1984-06-09 1986-01-08 Micropore International Ltd Radiation heater reflector

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401651A1 (fr) * 1989-06-07 1990-12-12 Bosch-Siemens HausgerÀ¤te GmbH Table de cuisson pour des cuisinières électriques, pour des plaques de cuisson et similaires
EP0556892A1 (fr) * 1992-02-12 1993-08-25 Philips Patentverwaltung GmbH Radiateur pour un appareil de cuisson
GB2324692A (en) * 1997-04-01 1998-10-28 Ceramaspeed Ltd IR heating lamp having different heating output zones
GB2324692B (en) * 1997-04-01 2001-02-14 Ceramaspeed Ltd Electric heater
US8263909B2 (en) 2007-02-07 2012-09-11 Lg Electronics Inc. Cooking apparatus and heater supporter for the same
CN101623071A (zh) * 2009-07-31 2010-01-13 九阳股份有限公司 一种豆浆机
CN101623071B (zh) * 2009-07-31 2012-10-03 九阳股份有限公司 一种豆浆机
CN103322506A (zh) * 2012-03-21 2013-09-25 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
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

Also Published As

Publication number Publication date
ES2042712T3 (es) 1993-12-16
DE3883455D1 (de) 1993-09-30
ATE93675T1 (de) 1993-09-15
EP0300548B1 (fr) 1993-08-25
DE3723077A1 (de) 1989-01-19
DE3723077C2 (fr) 1993-05-19

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