EP0373706B1 - Elément chauffant radiant pour appareils de cuisson - Google Patents

Elément chauffant radiant pour appareils de cuisson Download PDF

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Publication number
EP0373706B1
EP0373706B1 EP89203123A EP89203123A EP0373706B1 EP 0373706 B1 EP0373706 B1 EP 0373706B1 EP 89203123 A EP89203123 A EP 89203123A EP 89203123 A EP89203123 A EP 89203123A EP 0373706 B1 EP0373706 B1 EP 0373706B1
Authority
EP
European Patent Office
Prior art keywords
heater
heaters
plate
reflector
heating element
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
EP89203123A
Other languages
German (de)
English (en)
Other versions
EP0373706A2 (fr
EP0373706A3 (fr
Inventor
Walter Braun
Reinhard Dr. Kersten
Heinz Körver
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
Priority claimed from DE19883842033 external-priority patent/DE3842033A1/de
Application filed by Bauknecht Hausgeraete GmbH, Whirlpool Europe BV filed Critical Bauknecht Hausgeraete GmbH
Priority to AT89203123T priority Critical patent/ATE93674T1/de
Publication of EP0373706A2 publication Critical patent/EP0373706A2/fr
Publication of EP0373706A3 publication Critical patent/EP0373706A3/fr
Application granted granted Critical
Publication of EP0373706B1 publication Critical patent/EP0373706B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/744—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, in particular in the form of a glass ceramic plate, and with at least two rod-shaped radiators which run parallel to one another, e.g. B.
  • Halogen lamps which are arranged between the hotplate and associated reflectors, each reflector, forming a raised edge in the area of the radiator, has two abutting partial parabolic surfaces with raised outer edges, and the parts mentioned are arranged such that the above each radiator lying area of the hotplate is mostly hit by direct radiation and the outer areas mostly by reflected radiation, according to DE-A-37 23 077.
  • DE-A-37 23 077 describes a radiant heater in which a circular housing is provided under a hotplate, in which two halogen lamps, each with an associated reflector, are fastened. It has been shown that the largely parallel and straight bend edges below the spotlights, ie the halogen lamps, together with the round border certain places lead to an undesirable increase in power density. These locations lie once in the center of the circular arrangement, i.e. .H. in the middle between the two halogen lamps, and on the other hand in the two outside corners outside the halogen lamps, where their imaginary extension meets the circular border. Furthermore, the radiation density in all four zones of the edge boundary, which lie between the four named locations with the undesirable increase in the power density, is lower than desired.
  • the invention has for its object to design a radiant heater of the type mentioned in such a way that the radiation density is distributed as uniformly as possible over a circular plate.
  • This object is achieved according to the invention in that the halogen lamps are located in a reflector trough which is closed on all sides and in that the bent edges assigned to the halogen lamps, lying in a plane parallel to the hotplate, are curved outwards in such a way that the projection of a folded edge and an associated halogen lamp on the hob two interfaces in the end of the halogen lamp.
  • the radiation is influenced by such a configuration of the fold edge or fold line in such a way that the radiation density is reduced in the center and in the outer gussets of the radiator ends and the radiation density is increased in the edge regions which lie between the mentioned outer gussets.
  • An advantageous embodiment is characterized by a circular reflector trough with two halogen lamps, the location of the smallest distance between the two circular arc-shaped folding edges being in the middle between the two halogen lamps and with each folding edge at its ends, after passing under the halogen lamp in its end regions, into the Trough wall runs out.
  • a circular reflector trough with the aforementioned folding edges designed according to the invention enables an optimal distribution of the radiation energy with little effort.
  • a preferred embodiment of the invention is that the fictitious interfaces between the fold edges and the respective ends of the halogen lamps are in the last quarter of the halogen lamps.
  • 1a and 1b show a radiant heater 10 with a housing 11 and with two halogen lamps 12 which are arranged between two reflectors 13, 14 and the hotplate 15.
  • the reflectors 13, 14 are each formed from two partial parabolic surfaces 13 ', 13 ⁇ and 14', 14 ⁇ and have two folding edges 13a, 14a, which run parallel to the halogen lamps 12 at a constant distance.
  • the reflectors 13, 14 run out into the conical edge boundary in the outer region.
  • the measured power distribution has shown that the largely parallel and straight fold edges 13a, 14a below the radiators 12 together with the round edge limitation of the housing 11 at the points 16a and 16b lead to an undesirable increase in the power density (+).
  • the point 16a lies in the center of the hotplate, and the points 16b lie in the outer gussets of the ends of the radiators 12. In contrast, in the edge zones 16c and 16d lying between these points, the radiation density is lower than desired (-).
  • 1b schematically shows a cross section through the center of the known radiator according to FIG. 1a.
  • Fig. 2 shows the radiant heater 10 with its housing 11 and the two parallel rod-shaped Halogen lamps 12.
  • 17 and 18 denote the reflectors specially designed according to the invention, the buckling edges 17a, 18a of which are designed in the shape of a circular arc and, viewed from above, each form two fictitious interfaces 19, 20 with the halogen lamps 12.
  • the curved folding edges 17a, 18a have the smallest mutual distance 21 in the middle between the two halogen lamps 12.
  • the projection of the halogen lamps 12 and the folding edges 17a, 18a onto the hob 15 results, measured at right angles to the halogen lamps 12, on this side of the halogen lamps being the largest mutual distance 22, 23 and beyond the halogen lamps 12 a greatest mutual distance 24, 25.
  • the schematic course of the reflectors 17 and 18 with their kinked edges 17a, 18a can be seen from the sectional images shown in FIGS. 3 and 4.
  • Each reflector 17, 18 has two partial parabolic surfaces 17 ', 17 ⁇ and 18', 18 ⁇ , which merge into one another at the folding edges 17a, 18a.
  • the radiation course belonging to these figures and the radiation distribution can be seen from FIGS. 5 and 6.
  • With 26 the radiation course and with 27 the respectively achievable radiation distribution in the area of the lamp center according to section A-A and in the area of the lamp ends according to section B-B is shown.
  • Such an asymmetrical course of the reflectors 17, 18 results in a radiation distribution which has been corrected with regard to the irregularities mentioned in the marginal zones and in the middle. 5, the radiation density 27a is increased in the region of the edge zones 16c. 6, the radiation density 27b is increased in the middle of the plate at the end of the lamp in the region of the edge zone 16d.

Landscapes

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

Claims (2)

  1. Elément chauffant radiant (10) pour appareils de cuisson, comprenant une plaque de cuisson (15), constituée en particulier par une plaque de vitrocéramique, et au moins deux radiateurs (12) en forme de barreau, s'étendant parallèlement l'un par rapport à l'autre et formés par des lampes à halogène par exemple, qui sont placés entre la plaque de cuisson et des réflecteurs coordonnés, élément dans lequel chaque réflecteur comporte deux surfaces paraboliques partielles qui se rejoignent, avec formation d'une arête d'inflexion relevée dans la région du radiateur, et présentent des bords extérieurs relevés, et dans lequel les parties mentionnées sont disposées les unes par rapport aux autres de manière que la zone de la plaque de cuisson située au-dessus de chaque radiateur (12) reçoive principalement du rayonnement direct et les zones extérieures reçoivent principalement du rayonnement réfléchi, caractérisé en ce que les radiateurs (12) sont situés dans une cuvette réflectrice (17, 18) fermée de tous côtés et que les arêtes d'inflexion (17a, 18a) coordonnées aux radiateurs (12), situées dans un plan parallèle à la plaque de cuisinière ou analogue (15), sont courbées vers l'extérieur de manière que la projection d'une arête d'inflexion (17a, 18a) et du radiateur (12) correspondant sur la plaque de cuisinière (15) donne deux intersections (19, 20) dans les régions terminales du radiateur (12).
  2. Elément chauffant radiant selon la revendication 1, caractérisé par une cuvette réflectrice (17, 18) de forme circulaire et contenant deux radiateurs (12), le point d'espacement minimal (21) des arêtes d'inflexion (17a, 18a), en forme d'arc de cercle, étant situé au milieu entre les deux radiateurs (12) et chaque arête d'inflexion (17a, 18a), après le croisement du radiateur (12), en passant sous lui dans ses régions terminales, aboutit par ses extrémités dans la paroi de la cuvette réflectrice (17, 18).
EP89203123A 1988-12-14 1989-12-08 Elément chauffant radiant pour appareils de cuisson Expired - Lifetime EP0373706B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89203123T ATE93674T1 (de) 1988-12-14 1989-12-08 Strahlheizkoerper fuer kochgeraete.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883842033 DE3842033A1 (de) 1987-07-11 1988-12-14 Strahlheizkoerper fuer kochgeraete
DE3842033 1988-12-14

Publications (3)

Publication Number Publication Date
EP0373706A2 EP0373706A2 (fr) 1990-06-20
EP0373706A3 EP0373706A3 (fr) 1992-01-02
EP0373706B1 true EP0373706B1 (fr) 1993-08-25

Family

ID=6369116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89203123A Expired - Lifetime EP0373706B1 (fr) 1988-12-14 1989-12-08 Elément chauffant radiant pour appareils de cuisson

Country Status (4)

Country Link
EP (1) EP0373706B1 (fr)
AT (1) ATE93674T1 (fr)
DE (1) DE58905389D1 (fr)
ES (1) ES2042984T3 (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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080073860A (ko) 2007-02-07 2008-08-12 엘지전자 주식회사 조리 기기용 히터 서포터 및 이를 이용한 조리 기기

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1059854B (de) * 1956-07-28 1959-06-25 Siemens Ag Breitstrahlende Leuchte, insbesondere Strassenleuchte
FR1520463A (fr) * 1967-01-12 1968-04-12 Projecteur pour appareils d'éclairage ou de chauffage par rayonnement
DK145207C (da) * 1976-12-21 1983-02-28 Poulsen Louis & Co A S Belysningsarmatur med en spejlende reflektor
GB2161348A (en) * 1984-06-09 1986-01-08 Micropore International Ltd Radiation heater reflector
DE3710241A1 (de) * 1987-03-27 1988-10-06 Siemens Ag Aussenleuchte

Cited By (3)

* 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
EP2110001A4 (fr) * 2007-02-07 2011-03-16 Lg Electronics Inc Cuisinière
US7956309B2 (en) 2007-02-07 2011-06-07 Lg Electronics Inc. Cooking apparatus

Also Published As

Publication number Publication date
EP0373706A2 (fr) 1990-06-20
ES2042984T3 (es) 1993-12-16
ATE93674T1 (de) 1993-09-15
DE58905389D1 (de) 1993-09-30
EP0373706A3 (fr) 1992-01-02

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