EP0556892A1 - Radiateur pour un appareil de cuisson - Google Patents

Radiateur pour un appareil de cuisson Download PDF

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Publication number
EP0556892A1
EP0556892A1 EP93200295A EP93200295A EP0556892A1 EP 0556892 A1 EP0556892 A1 EP 0556892A1 EP 93200295 A EP93200295 A EP 93200295A EP 93200295 A EP93200295 A EP 93200295A EP 0556892 A1 EP0556892 A1 EP 0556892A1
Authority
EP
European Patent Office
Prior art keywords
reflector
region
edge
hotplate
radiator
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
EP93200295A
Other languages
German (de)
English (en)
Other versions
EP0556892B1 (fr
Inventor
Reinhard Dr. Kersten
Klaus Klinkenberg
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics 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
Application filed by Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0556892A1 publication Critical patent/EP0556892A1/fr
Application granted granted Critical
Publication of EP0556892B1 publication Critical patent/EP0556892B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/22—Reflectors for radiation heaters
    • 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 a cooking appliance with a hotplate designed in particular as a glass ceramic plate, with at least one trough-shaped reflector having a radiator, which is divided into two reflector sections by a raised edge running below the radiator.
  • the invention has for its object to improve a radiant heater of the type mentioned in such a way that the load in the region of the side walls of the radiant heater is reduced while maintaining a uniform radiation distribution in the plane of the hotplate.
  • Another advantageous design of the invention is characterized by two trough-shaped reflectors forming a cooktop and merging into one another via a straight, raised central edge, with two rod-shaped, parallel emitters and with two drawn up from the reflectors below the emitters, outward curved fold edges.
  • the reflector sections located outside the buckling edges are each subdivided into the sub-areas mentioned.
  • halogen lamps are preferably provided as emitters.
  • the design of the reflectors according to the invention results in a considerable reduction in the side wall load. This is due to the fact that the corresponding reflected rays now emerge steeper from the reflector troughs in the middle section and thus hit the side walls at a greater distance from the hotplate and also at a flatter radiation angle. This measure alone would result in an excessively high irradiance in the area of the radiators and an insufficient irradiance on the outside.
  • the fact that both a single and a double reflection takes place in the outer partial area results in a good homogeneous radiation distribution over the entire hotplate.
  • the invention thus enables both a homogeneous radiation distribution on the bottom of the pot and a reduction in the load on the side walls.
  • Another advantage according to the invention is that almost all reflected rays pass the emitters themselves. In practice, this has the effect that when using a lamp, for. B. a halogen lamp, as the lamp of the lamp bulb is less heated due to reduced reabsorption.
  • the design of the reflectors according to the invention also means an improvement in that the reflected rays now hit the hotplate or the pan base on average at a steeper angle than before. This increases the efficiency of the arrangement.
  • a further reduction in the side wall load can be achieved in that, in an embodiment of the invention, at least part of the surface of the reflectors is facet-shaped with flat elements. This faceting enables the beam of rays corresponding to the size of the facets to be aligned in a targeted manner on the hotplate on the one hand and the side wall on the other. A glass-like bundling is not possible with a faceted design of the reflectors. At the same time, a sufficiently uniform distribution of the radiation on the hotplate can be achieved. The fewer facet elements are used for the entire reflector area (always in accordance with sufficient homogeneity on the bottom of the pot), the more fluid the distribution outside the hotplate. The faceting results in a wider and thus lower side wall load.
  • a facet-like reflector results from the fact that the facet elements, following the trough-shaped curvature, extend approximately in the direction of the crease edge and form an obtuse angle with one another and that the radius of curvature of the individual facet elements projected onto the hotplate extends outwards from the crease edge increases.
  • This the design of the individual facet elements which resembles a banana, ensures a high level of homogeneity of the rays in the hotplate.
  • Another particular advantage of faceting is that a greater fault tolerance can be achieved with respect to misalignment of the radiator. Even with an inevitable spiral sag, the faceted system becomes more fault-tolerant.
  • the distribution of the direct radiation within the partial areas is achieved in that the width and inclination of the facet elements and also the diameter of the radiator and its distance from the facet elements are correspondingly coordinated with one another.
  • the outer portion of the reflector trough is constructed from a single reflector element. This prevents focal lines in the outer area of the pot base and inhomogeneities in the area in which the middle and outer partial area of the reflector collide.
  • the inner and the central partial area of the reflector are each made up of a few reflector elements.
  • the inner partial area which is close to the fold edge is preferably constructed from four reflector elements. It is thereby achieved that the predominant part (approx. 90%) of the radiation for the purpose of double reflection towards the outer partial area of the reflector is directed.
  • FIG. 1 to 3 show a radiant heater 10 with a housing 11 and two halogen lamps 12, 13 which are arranged between two trough-shaped reflectors 14, 15 and a hotplate 16.
  • the two reflectors meet at an edge 17 in the central region or merge into one another.
  • the reflectors 14, 15 each have an outwardly curved bend edge 19, 20 which extends in a common plane 18 below the hotplate 16 and is raised in the direction of the halogen lamps 12, 13.
  • the bend edges which are designed in the shape of an arc, form two, viewed from above fictitious interfaces 21 with the halogen lamps 12, 13.
  • the reflectors 14, 15 are designed in the form of facets.
  • the individual facet elements are indicated in the right part of FIG. 1 and designated 22.
  • the folded edges 19, 20 cause a beam splitting to the left and right around the lamps.
  • 2 and 3 show schematically in two sectional images the design of the reflectors 14, 15 and the position and the course of the halogen lamps 12, 13 and the folding edges 19, 20.
  • Each reflector 14, 15 has two formed by the folding edges 19, 20 Reflector sections 14a, b and 15a, b.
  • FIG. 4 shows a radiation course belonging to FIG. 2 with the associated radiation distribution corresponding to section A-A in FIG. 1.
  • the right part of the radiant heater is shown, i. H. the area with the reflector 15.
  • the left edge of the image in FIG. 4 represents the plane of symmetry 23 of the two reflectors 14, 15. It is to be understood as a mirror in order to evaluate the rays of the other halogen lamp 12 of the reflector 14.
  • the radiation distribution 24 is plotted above the hotplate 16.
  • the area from the plane of symmetry 23 to the crease edge 20 is designated 25, while the outer area beyond the crease edge is divided into three sub-areas 26, 27 and 28.
  • the direct radiation emanating from the lamp 13 and hitting the hotplate 16 without reflection is designated by 29.
  • the direct radiation 30 striking the reflector sub-area 15b in the region 25 is directed onto the hotplate 16 after single reflection 30 '.
  • the direct radiation 31 incident in the partial region 26 is first directed into the partial region 28 and then reflected again, so that this radiation 31 is only directed into the outer region of the hotplate 16 after a double reflection 31 ′, 31 ′′.
  • this partial area 28 there is also a single reflection 32 'of direct rays 32, which are likewise directed into the outer area of the hotplate 16.
  • the direct beams 33 are directed into the central area of the hotplate 16 after single reflection 33 'and hit the hotplate 16 relatively steeply.
  • FIG. 4a shows schematically and enlarged the transition from the partial area 27 to the partial area 28 of the reflector section 15a, in which a total of four facet elements 22 are shown, each of which forms the obtuse angles 22a to 22c with one another.
  • FIG. 5 shows the load that occurs on the left side wall 34 in the region of the reflector 14 according to FIG. 2.
  • the cross section of the reflector 14 is shown rotated by 90 ° in FIG. 5.
  • the side wall 34 which is represented in FIG. 5 by the upper horizontal irradiation surface, is located at a distance 35 from the center of the hotplate.
  • the side wall load represented by 36 has a maximum at a height 37 above the hotplate 16.
  • the maximum of the side wall loading in the prior art is 38, ie at a considerably smaller distance from the hotplate 16 than in the invention.
  • FIG. 5 shows the load that occurs on the left side wall 34 in the region of the reflector 14 according to FIG. 2.
  • the cross section of the reflector 14 is shown rotated by 90 ° in FIG. 5.
  • the side wall 34 which is represented in FIG. 5 by the upper horizontal irradiation surface, is located at a distance 35 from the center of the hotplate.
  • the side wall load represented by 36 has a maximum at a height 37
  • the rays do not emerge from the reflector 39 as steeply and therefore hit the side wall at an unfavorable angle than in the construction according to the invention.
  • the side wall load has become considerably smaller, like shows the height of the maximum.
  • the radiation units per unit area are approximately one third lower.
  • FIG. 7 shows, in comparison to FIG. 4, the known reflector 39 with a raised, outwardly curved fold edge 40.
  • the area beyond the fold edge 40 is not divided into partial regions. There is no double reflection with this design.
  • the rays to the right of the lamp 41 do not emerge as steeply here as in the construction according to the invention.
  • the radiation distribution 42 is also relatively uniform here.
  • the faceted design of the reflectors according to the invention makes it possible to allow the light beams to diverge outside the reflectors while avoiding focal lines. This means that this can also reduce the side wall load.
  • the reflector is faceted in both versions.
  • the reflector 44 is divided by a raised folding edge 45 into two identical sections 44a and 44b, both of which are each divided into three partial areas 26, 27, 28.
  • a single or double reflection takes place here in the individual partial areas, so that a similarly uniform and good distribution results in this example.
  • the load on the side wall according to FIG. 9 is correspondingly favorable. From FIG. 8 it follows that the bent edge 45 is at a relatively large distance from the radiator 43. This large distance leads to Combination with double reflection for a particularly low side wall load according to FIG. 9.
  • the reflector 46 is also divided into two identical sections 46a, b by its kink edge 47, the kink edge 47 here being very close to the radiator 43.
  • the reflector 46 is shaped such that only a single reflection of the rays 48 takes place, as can be clearly seen from the radiation course.
  • the kink edge 47 is very close to the radiator 43, double reflection and a corresponding design of the reflector in the area adjacent to the kink edge 47 to reduce the side wall load are not necessary.
  • the radiator 43 is penetrated by reflected rays disadvantageously.
  • the proportional reflector opening is formed from the sum of the sections 26 to 28. In this sense, there is a small distance if the ratio is of the order of magnitude less than about 0.1, and there is a large distance if the ratio of the order of magnitude is greater than is about 0.1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
  • Baking, Grill, Roasting (AREA)
EP93200295A 1992-02-12 1993-02-04 Radiateur pour un appareil de cuisson Expired - Lifetime EP0556892B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4203996A DE4203996A1 (de) 1992-02-12 1992-02-12 Strahlheizkoerper fuer ein kochgeraet
DE4203996 1992-02-12

Publications (2)

Publication Number Publication Date
EP0556892A1 true EP0556892A1 (fr) 1993-08-25
EP0556892B1 EP0556892B1 (fr) 1996-09-11

Family

ID=6451432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93200295A Expired - Lifetime EP0556892B1 (fr) 1992-02-12 1993-02-04 Radiateur pour un appareil de cuisson

Country Status (3)

Country Link
EP (1) EP0556892B1 (fr)
AT (1) ATE142839T1 (fr)
DE (2) DE4203996A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000059323A (ko) * 1999-03-02 2000-10-05 구자홍 그릴 전자레인지
KR100803158B1 (ko) * 2006-03-30 2008-02-14 서울반도체 주식회사 측면 지향형 광반사구 및 발광장치
WO2008096942A3 (fr) * 2007-02-07 2008-11-20 Lg Electronics Inc Cuisinière
CN101606431B (zh) * 2007-02-07 2012-05-09 Lg电子株式会社 烹饪器具
US8263909B2 (en) 2007-02-07 2012-09-11 Lg Electronics Inc. Cooking apparatus and heater supporter for the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004023847B4 (de) * 2004-05-13 2013-12-05 BSH Bosch und Siemens Hausgeräte GmbH Kochfläche mit einer Glaskeramikplatte
WO2017061965A1 (fr) * 2015-10-08 2017-04-13 Arcelik Anonim Sirketi Gril électrique portatif

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3674983A (en) * 1971-04-08 1972-07-04 Gen Electric Smooth surface electric cooktop
US3686477A (en) * 1971-08-06 1972-08-22 Gen Electric Mounting system for solid plate surface heating units
US3816704A (en) * 1972-03-20 1974-06-11 Gen Electric Surface heating apparatus
EP0300548A1 (fr) * 1987-07-11 1989-01-25 Bauknecht Hausgeräte GmbH Elément chauffant radiant pour cuisinières
DE3842033A1 (de) * 1987-07-11 1990-07-05 Bauknecht Hausgeraete Strahlheizkoerper fuer kochgeraete

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3674983A (en) * 1971-04-08 1972-07-04 Gen Electric Smooth surface electric cooktop
US3686477A (en) * 1971-08-06 1972-08-22 Gen Electric Mounting system for solid plate surface heating units
US3816704A (en) * 1972-03-20 1974-06-11 Gen Electric Surface heating apparatus
EP0300548A1 (fr) * 1987-07-11 1989-01-25 Bauknecht Hausgeräte GmbH Elément chauffant radiant pour cuisinières
DE3842033A1 (de) * 1987-07-11 1990-07-05 Bauknecht Hausgeraete Strahlheizkoerper fuer kochgeraete

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000059323A (ko) * 1999-03-02 2000-10-05 구자홍 그릴 전자레인지
KR100803158B1 (ko) * 2006-03-30 2008-02-14 서울반도체 주식회사 측면 지향형 광반사구 및 발광장치
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
CN101606431B (zh) * 2007-02-07 2012-05-09 Lg电子株式会社 烹饪器具
US8263909B2 (en) 2007-02-07 2012-09-11 Lg Electronics Inc. Cooking apparatus and heater supporter for the same

Also Published As

Publication number Publication date
EP0556892B1 (fr) 1996-09-11
DE4203996A1 (de) 1993-08-19
ATE142839T1 (de) 1996-09-15
DE59303698D1 (de) 1996-10-17

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