EP1045616B1 - Elektrischer Strahlungsheizkörper und Herstellungsverfahren - Google Patents

Elektrischer Strahlungsheizkörper und Herstellungsverfahren Download PDF

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Publication number
EP1045616B1
EP1045616B1 EP00302846A EP00302846A EP1045616B1 EP 1045616 B1 EP1045616 B1 EP 1045616B1 EP 00302846 A EP00302846 A EP 00302846A EP 00302846 A EP00302846 A EP 00302846A EP 1045616 B1 EP1045616 B1 EP 1045616B1
Authority
EP
European Patent Office
Prior art keywords
strips
base
undulations
heating element
protrusions
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
EP00302846A
Other languages
English (en)
French (fr)
Other versions
EP1045616A2 (de
EP1045616A3 (de
Inventor
George Anthony Higgins
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.)
Ceramaspeed Ltd
Original Assignee
Ceramaspeed Ltd
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 Ceramaspeed Ltd filed Critical Ceramaspeed Ltd
Publication of EP1045616A2 publication Critical patent/EP1045616A2/de
Publication of EP1045616A3 publication Critical patent/EP1045616A3/de
Application granted granted Critical
Publication of EP1045616B1 publication Critical patent/EP1045616B1/de
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
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater

Definitions

  • This invention relates to radiant electric heaters and a method of manufacture.
  • the invention relates to radiant electric heaters, particularly for use in glass-ceramic cooking appliances, comprising a heating element in the form of a geometrical pattern separated from a metal foil and overlying a base of thermal and electrical insulation material, the pattern including a plurality of strips in lateral spaced disposition, traversing the heater.
  • a heating element in the form of a geometrical pattern separated from a metal foil and overlying a base of thermal and electrical insulation material, the pattern including a plurality of strips in lateral spaced disposition, traversing the heater.
  • Each of the strips has a width considerably greater than its thickness and has a major face facing the base.
  • a radiant electric heater comprising a heating element in the form of a geometrical pattern separated from a metal foil and overlying a base of thermal and electrical insulation material, the pattern including a plurality strips in lateral spaced disposition traversing the heater and each having a width considerably greater than its thickness, the strips each having a major face facing the base, the strips being formed with undulations providing alternating peaks and troughs and such that, for any strip, peaks of the undulations thereof are substantially laterally aligned with troughs of the undulations in an adjacent strip, the heating element being arranged with peaks of the undulations in the strips supported on protrusions provided on the base.
  • a method of manufacturing a radiant electric heater comprising the steps of providing a base of thermal and electrical insulation material; providing a heating element in the form of a geometrical pattern separated from a metal foil and overlying the base of thermal and electrical insulation material, the pattern including a plurality of strips in lateral spaced disposition traversing the heater and each having a width considerably greater than its thickness, the strips each having a major face facing the base; forming the strips with undulations providing alternating peaks and troughs and such that, for any strip, peaks of the undulations thereof are substantially laterally aligned with troughs of the undulations in an adjacent strip; providing protrusions on the base; and arranging the heating element with peaks of the undulations in the strips supported on the protrusions.
  • the method may further comprise temporarily locating a heat-resistant electrically insulating member securely against the supported heating element and electrically energising the heating element for a predetermined period of time.
  • the protrusions may be provided integrally with the base.
  • the protrusions may be provided in rows and may be arranged to maintain spacing between adjacent strips.
  • the heating element may be supported with troughs of the undulations in the strips free from contact with the base.
  • the strips may be arranged substantially parallel to one another.
  • Means may be provided for securing opposite end regions of the strips to prevent longitudinal movement of the strips.
  • Such means for securing may be at a peripheral region of the base and may comprise clamping or hooking means, or staples or pins or the like.
  • a peripheral wall of insulation material may be provided for the heater.
  • the peripheral wall may overlie opposite end regions of the strips.
  • the base of thermal and electrical insulation material may be provided in a supporting dish, such as of metal, and may comprise microporous thermal and electrical insulation material.
  • the heating element in the form of the geometrical pattern may be separated from the metal foil by means such as etching, stamping, cutting, or milling.
  • a radiant electric heater 1 suitable for use under a glass-ceramic surface in a cooking appliance, has a metal supporting dish 2 in which is provided a base 3 of compacted microporous thermal and electrical insulation material of well-known form.
  • the base 3 is provided with rows of protrusions 4, suitably formed integral with the base 3.
  • the protrusions 4 in one row are offset with regard to those in the next row such that a protrusion in one row is next to the midway point between two protrusions in an adjacent row.
  • a heating element 5 is produced in the form of a desired geometrical pattern by separation from a metal foil.
  • a metal foil may, for example, comprise an iron-chromium-aluminium alloy of thickness between about 40 and 200 microns and preferably between about 50 and 100 microns.
  • the geometrical pattern of the heating element 5 shown in Figure 1 is of meandering or zig-zag form, but other forms could be considered. It is suitably produced from a metal foil by a well known operation, such as etching, stamping, cutting, or milling.
  • the resulting pattern of the heating element 5 includes a plurality of strips 6 in lateral spaced disposition, preferably but not essentially parallel to each other, each having a width considerably greater than its thickness. By way of example, a typical width for each strip 6 would be about 3 mm.
  • the strips 6 each have a major face which is to face the base 3 having the protrusions 4 thereon.
  • the strips 6 are formed with undulations providing alternating peaks 7 and troughs 8.
  • the peaks and troughs in adjacent strips are staggered such that for any strip 6, peaks 7 of the undulations are substantially laterally aligned with troughs 8 of the undulations in an adjacent strip.
  • the resulting heating element 5 is arranged with respect to the base 3 of the heater, such that the strips 6 traverse the heater with peaks 7 of the undulations supported on the protrusions 4 provided on the base.
  • the arrangement is such that the troughs 8 of the undulations on the strip 6 locate between protrusions 4 on either side thereof and sideways movement of the strips 6 is thereby prevented or minimised. In this way lateral contact between adjacent strips 6 is prevented at all times so that during subsequent operation of the heater there is no risk of lateral distortion of the strips 6 or of short-circuiting between adjacent strips.
  • the troughs 8 of the undulations of the strips 6 are preferably arranged such that, at least when the heating element 5 is in an unenergised condition, and optionally also in an energised condition, they are free from contact with the surface 9 of the base 3 between the protrusions 4, a gap being provided between the troughs 8 of the undulations and the surface 9 of the base.
  • Each strip 6 merges with an adjacent strip at the ends thereof to form the meandering heating element 5 and means are provided for securing opposite end regions 10, 11 of each strip 6 to prevent movement of the strips in a longitudinal direction.
  • a peripheral wall 12 of thermal insulation material is provided in the heater. The heater is located for operation with the top surface of the wall 12 in contact with the underside of a glass-ceramic cooking surface (not shown).
  • the end regions 10, 11 of the strips 6 may be arranged to be clamped between the bottom of the wall 12 and the base 3 of thermal insulation material.
  • pins or staples 13 may be provided, passing through holes in the ends 10, 11 of the strips 6 and either downwards into the base 3 or upwards into the wall 12.
  • FIG. 3 A further means of securing the ends of the strip is shown in Figure 3.
  • the base 3 of thermal insulation material is provided with a step 14 at a location inboard of the peripheral wall 12.
  • a complementary step 15 is provided at the ends of the strips 6 of the heating element and the element is effectively hooked at these ends onto the step 14.
  • the remaining end portions 10, 11 of the strips 6 are arranged to be trapped under the peripheral wall 12 to prevent lifting of the heating element.
  • Terminals 16, 17 are provided for connecting the heating element 5 to a voltage supply (not shown) for energising the heater.
  • a heat-resistant electrically insulating member such as a ceramic
  • This process anneals and heat-sets the element to ensure minimum tendency for any lifting or distortion of the element to occur during subsequent operation of the heater in service.
  • non-uniform power per surface area of the heater may be desirable to provide non-uniform power per surface area of the heater, for example to provide higher power per surface area around the edge of the heater than at the centre.
  • This can be achieved by providing the strips 6 of non-uniform, as opposed to uniform, cross sectional area.
  • the cross sectional area may be smaller at the end regions of the strips than at the central regions.
  • the ratio of the length of the strips between the protrusions to the distance between the protrusions may be varied, for example to be greater at the edge of the heater than at the centre.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Surface Heating Bodies (AREA)

Claims (20)

  1. Elektrische Strahlungsheizung, die ein Heizelement (5) in Form eines geometrischen Musters umfasst, das von einer Metallfolie getrennt ist und über einer Basis (3) aus thermischem und elektrischem Isoliermaterial liegt, wobei das Muster eine Mehrzahl von Streifen (6) in lateral beabstandeter Anordnung beinhaltet, die die Heizung (1) überqueren und jeweils eine Breite haben, die wesentlich größer als ihre Dicke ist, wobei die Streifen (6) jeweils eine der Basis (3) zugewandte Hauptfläche haben, wobei die Streifen Wellen aufweisen, die alternierende Gipfel (7) und Täler (8) haben, dadurch gekennzeichnet, dass bei jedem Streifen die Gipfel seiner Wellen im Wesentlichen lateral auf Täler der Wellen in einem angrenzenden Streifen ausgerichtet sind, wobei das Heizelement (5) so angeordnet ist, dass die Gipfel (7) der Wellen in den Streifen (6) auf Vorsprüngen (4) auf der Basis (3) getragen werden.
  2. Heizung nach Anspruch 1, dadurch gekennzeichnet, dass die Vorsprünge (4) an der Basis (3) angeformt sind.
  3. Heizung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Vorsprünge (4) in Reihen vorgesehen sind.
  4. Heizung nach Anspruch 3, dadurch gekennzeichnet, dass die Vorsprünge (4) so angeordnet sind, dass ein Abstand zwischen benachbarten Streifen (6) bleibt.
  5. Heizung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Heizelement (5) so getragen wird, dass die Täler (8) der Wellen in den Streifen (6) keinen Kontakt zur Basis (3) haben.
  6. Heizung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Streifen (6) im Wesentlichen parallel zueinander angeordnet sind.
  7. Heizung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass Mittel (12, 13) zum Befestigen gegenüberliegender Endregionen der Streifen (6) vorgesehen sind, um eine Längsbewegung der Streifen zu verhindern.
  8. Heizung nach Anspruch 7, dadurch gekennzeichnet, dass die Befestigung der gegenüberliegenden Endregionen der Streifen (6) an einer peripheren Region der Basis (3) erfolgt.
  9. Heizung nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass das Mittel zum Befestigen Klemm- oder Hakenmittel (12) oder Klammern oder Stifte (13) umfasst.
  10. Heizung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass eine Umfangswand (12) aus Isoliermaterial vorgesehen ist, wobei die Umfangswand vorzugsweise über gegenüberliegenden Endregionen der Streifen (6) liegt.
  11. Verfahren zur Herstellung einer elektrischen Strahlungsheizung, das die folgenden Schritte beinhaltet: Bereitstellen einer Basis (3) aus thermischem und elektrischem Isoliermaterial; Bereitstellen eines Heizelements (5) in Form eines geometrischen Musters, das von einer Metallfolie getrennt wird und über der Basis (3) aus thermischem und elektrischem Isoliermaterial liegt, wobei das Muster eine Mehrzahl von Streifen (6) in lateral beabstandeter Anordnung beinhaltet, die die Heizung (1) überqueren und jeweils eine Breite haben, die wesentlich größer als ihre Dicke ist, wobei die Streifen (6) jeweils eine der Basis (3) zugewandte Hauptfläche haben; Ausbilden der Streifen (6) mit Wellen, die alternierende Gipfel (7) und Täler (8) haben, so dass bei jedem Streifen die Gipfel seiner Wellen im Wesentlichen lateral auf Täler der Wellen in einem Nachbarstreifen ausgerichtet sind; Erzeugen von Vorsprüngen (4) auf der Basis (3); und Anordnen des Heizelements (5) in einer solchen Weise, dass die Gipfel (7) der Wellen in den Streifen (6) auf den Vorsprüngen (4) aufliegen.
  12. Verfahren nach Anspruch 11, gekennzeichnet durch den weiteren Schritt des temporären Platzierens eines wärmebeständigen elektrisch isolierenden Elements fest am abgestützten Heizelement (5) und des elektrischen Speisens des Heizelements für eine vorbestimmte Zeitdauer.
  13. Verfahren nach Anspruch 11 oder 12, dadurch gekennzeichnet, dass die Vorsprünge (4) an der Basis (3) angeformt werden.
  14. Verfahren nach Anspruch 11, 12 oder 13, dadurch gekennzeichnet, dass die Vorsprünge (4) in Reihen vorgesehen werden.
  15. Verfahren nach Anspruch 14, dadurch gekennzeichnet, dass die Vorsprünge (4) so angeordnet werden, dass ein Abstand zwischen benachbarten Streifen (6) bleibt.
  16. Verfahren nach einem der Ansprüche 11 bis 15, dadurch gekennzeichnet, dass das Heizelement (5) so getragen wird, dass die Täler (8) der Wellen in den Streifen (6) keinen Kontakt zur Basis (3) haben.
  17. Verfahren nach einem der Ansprüche 11 bis 16, dadurch gekennzeichnet, dass die Streifen (6) im Wesentlichen parallel zueinander angeordnet werden.
  18. Verfahren nach einem der Ansprüche 11 bis 17, dadurch gekennzeichnet, dass Mittel (12, 13) zum Befestigen gegenüberliegender Endregionen der Streifen (6) vorgesehen werden, um eine Längsbewegung der Streifen zu verhindern, wobei das Befestigungsmittel zum Beispiel an einer peripheren Region der Basis (3) vorgesehen wird.
  19. Verfahren nach Anspruch 18, dadurch gekennzeichnet, dass die Befestigungsmittel Klemm- oder Hakenmittel (12) oder Klammern oder Stifte (13) umfassen.
  20. Verfahren nach einem der Ansprüche 11 bis 19, dadurch gekennzeichnet, dass eine Umfangswand (12) aus Isoliermaterial vorgesehen wird, wobei die Umfangswand vorzugsweise über gegenüberliegenden Endregionen der Streifen (6) liegt.
EP00302846A 1999-04-16 2000-04-04 Elektrischer Strahlungsheizkörper und Herstellungsverfahren Expired - Lifetime EP1045616B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9908609A GB2349059B (en) 1999-04-16 1999-04-16 Radiant electric heater and method of manufacture
GB9908609 1999-04-16

Publications (3)

Publication Number Publication Date
EP1045616A2 EP1045616A2 (de) 2000-10-18
EP1045616A3 EP1045616A3 (de) 2001-10-24
EP1045616B1 true EP1045616B1 (de) 2006-12-27

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Application Number Title Priority Date Filing Date
EP00302846A Expired - Lifetime EP1045616B1 (de) 1999-04-16 2000-04-04 Elektrischer Strahlungsheizkörper und Herstellungsverfahren

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EP (1) EP1045616B1 (de)
AT (1) ATE349878T1 (de)
DE (1) DE60032539T2 (de)
ES (1) ES2278579T3 (de)
GB (1) GB2349059B (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034206A (en) * 1976-05-11 1977-07-05 Gould Inc. Range top element
US4100395A (en) * 1976-06-29 1978-07-11 Glenro, Inc. Expanded element radiant heating device
SE7806238L (sv) * 1977-07-02 1979-01-03 Fischer Karl Elektriskt stralningsvermeelement, serskilt for glaskeramikkokhell
DE19638640C2 (de) * 1996-09-21 2000-11-30 Diehl Ako Stiftung Gmbh & Co Strahlungsheizkörper mit einem Metallfolien-Heizleiter

Also Published As

Publication number Publication date
GB9908609D0 (en) 1999-06-09
EP1045616A2 (de) 2000-10-18
ES2278579T3 (es) 2007-08-16
GB2349059B (en) 2003-07-16
ATE349878T1 (de) 2007-01-15
EP1045616A3 (de) 2001-10-24
DE60032539T2 (de) 2007-10-04
GB2349059A (en) 2000-10-18
DE60032539D1 (de) 2007-02-08

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