EP0969698A1 - Verfahren zur Herstellung eines elektrischen Heizstrahlers - Google Patents

Verfahren zur Herstellung eines elektrischen Heizstrahlers Download PDF

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Publication number
EP0969698A1
EP0969698A1 EP99304661A EP99304661A EP0969698A1 EP 0969698 A1 EP0969698 A1 EP 0969698A1 EP 99304661 A EP99304661 A EP 99304661A EP 99304661 A EP99304661 A EP 99304661A EP 0969698 A1 EP0969698 A1 EP 0969698A1
Authority
EP
European Patent Office
Prior art keywords
support component
protrusion
insulation material
envelope
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.)
Withdrawn
Application number
EP99304661A
Other languages
English (en)
French (fr)
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 EP0969698A1 publication Critical patent/EP0969698A1/de
Withdrawn legal-status Critical Current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
    • H05B3/742—Plates having both lamps and resistive heating elements
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/032—Heaters specially adapted for heating by radiation heating

Definitions

  • This invention concerns a method of manufacturing a radiant electric heater of the kind incorporating an infra-red lamp having a tubular envelope of generally circular configuration.
  • the infra-red lamp generally has a tungsten filament supported inside a tubular envelope of generally circular configuration and comprising fused silica or quartz.
  • a halogenated atmosphere can be provided inside the envelope. Electrical connections are brought out through hermetic pinch seals at terminal regions of the envelope.
  • An infra-red lamp has a protrusion extending from an envelope thereof intermediate the ends of the envelope, the lamp being supported in the container at least in part by the protrusion.
  • the protrusion can comprise a sealed tube communicating with the interior of the envelope and used to evacuate and back-fill the envelope during manufacture of the infra-red lamp.
  • Clip and/or clamping means are provided applied to the protrusion and optionally to the envelope of the lamp. Such clip and/or clamping means are applied as an additional step after positioning the lamp in the container.
  • a method of manufacturing a radiant electric heater in which an infra-red lamp having a tubular envelope of generally circular configuration is provided with a protrusion intermediate terminal regions thereof by means of which the lamp is supported at least in part on a layer of compacted particulate insulation material in a container by way of a support component which has a first portion embedded in the insulation material and a second portion at least overlying the protrusion, the method comprising the steps of a) compacting particulate insulation material into the container and simultaneously embedding the first portion of the support component therein and b) positioning the infra-red lamp and engaging the protrusion with the second portion of the support component.
  • the insulation material may comprise microporous thermal insulation material.
  • the second portion of the support component may surround the protrusion.
  • the support component may comprise a strip or plate, such as of metal or ceramic, having opposite end regions constituting the first and second portions.
  • the end region constituting the second portion of the support component may be provided with an aperture therethrough for accommodating the protrusion on the tubular envelope.
  • the end region constituting the first portion of the support component may be profiled and/or apertured whereby securing of the support component in the insulation material is enhanced.
  • the support component may be of looped wire or looped strip form, and may have legs providing the first portion, the legs being bent whereby securing of the support component in the insulation material is enhanced.
  • the protrusion on the envelope may comprise a sealed tube communicating with the interior of the envelope, for example a tube used to evacuate and back-fill the envelope during manufacture of the infra-red lamp.
  • the envelope may comprise fused silica or quartz and may enclose a filament such as of tungsten.
  • a radiant electric heater has a container in the form of a metal dish 1 containing a layer of compacted particulate thermal and electrical insulation material 2, particularly microporous insulation material.
  • a ring-shaped wall 3 of insulation material extends around the periphery of the dish 1. When the heater is installed in a cooking appliance, the wall 3 is arranged to press against the underside of a glass-ceramic cooking surface (not shown).
  • An infra-red heat source is provided in the form of a lamp 4.
  • This lamp is of generally circular configuration and contains a tungsten filament 5 supported within a fused silica envelope 6.
  • the filament 5 is secured at each end to connections brought out through flattened hermetic pinch seals 7 at the ends of the envelope 6. These ends are adjacent one another and the pinch seals extend generally radially of the heater through recesses provided in the underside of the peripheral wall 3 and in the layer 2 and through holes in the edge of the dish 1.
  • a first support point is where the ends are engaged by the peripheral wall 3.
  • a second support point is provided diametrically opposite the first, in the form of a protrusion 8 provided on the lamp envelope 6.
  • the lamp 4 contains an atmosphere with a halogen gas and the protrusion 8 comprises a tube formed with the envelope 6 and used to evacuate the envelope and back-fill it with gas containing halogen during manufacture of the lamp. Thereafter the tube protrusion 8 is heat sealed.
  • the protrusion 8 supports the lamp 4 by way of a support component 9, described in detail hereinafter, which has a first portion embedded in the layer 2 of insulation material during formation of the layer 2, and a second portion at least overlying the protrusion 8.
  • the lamp 4 is shown to be of smoothly circular form, it need not be so and may be of polygonal form, approximating to a generally circular configuration.
  • ballast electrical resistance heating element 10 of well known ribbon or coiled wire form is provided in the heater, electrically connected in series with the lamp 4 at least during initial energisation of the lamp.
  • thermal limiter 11 is provided, extending across the heater and a terminal block 12 is arranged at the edge of the dish 1 for connection of the heater to a voltage supply for operation.
  • the invention resides in the method of provision of the support component 9 and of engaging the support component with the protrusion 8 on the lamp envelope.
  • the base layer 2 of insulation material is provided by compacting particulate insulation material into the dish 1. It is well known to carry this out by compacting, for example, powdered microporous insulation material into the metal dish 1 using an appropriate press tool.
  • a support component 9 such as is illustrated in Figures 2 to 6 has a first portion 13 thereof embedded in the insulation simultaneously with the compacting of the insulation material into the dish 1 to form the layer 2. This results in secure location of the support component 9 in the layer 2.
  • the infra-red lamp 4 is positioned in the heater and the protrusion 8 engaged with a second portion 14 of the support component 9, the second portion 14 at least overlying the protrusion 8.
  • the support component 9 is suitably located in the press tool (not shown) which is used to compact the insulation material and such that the second portion 14 of the component 9 is received in a slot in the face of the press tool with the first portion 13 protruding from the face of the press tool.
  • the support component 9 can comprise an elongate strip or plate, such as of metal or ceramic, having a first end portion 13 embedded in the layer 2 by the method described hereinbefore.
  • the second end portion 14 has an aperture through it which receives the protrusion 8 on the lamp envelope during the subsequent process step and such that the second end portion 14 effectively surrounds the protrusion.
  • an aperture 15 may optionally be provided in the first end portion 13. During compacting of the insulation layer 2 and simultaneous embedding of the first end portion 13 of the support component, material of the insulation layer 2 is also compacted into the aperture 15.
  • an alternative support component 9 can comprise a plate, such as of metal or ceramic having a relatively wide first end portion 13 embedded in the layer 2 by the method described hereinbefore.
  • An aperture 15 may optionally be provided in the first end portion 13 to enhance securement in the layer 2.
  • the plate-shaped support component 9 is profiled such that it has a second end portion 14 which is narrower than the first end portion 13 and has an aperture through it which receives the protrusion 8 on the lamp envelope when the lamp is subsequently located in the heater.
  • the second end portion 14 completely surrounds the protrusion 8.
  • Figure 4 shows an arrangement which is similar to that of Figure 3, the essential difference being that an enlarged aperture 16 is provided in the second portion 14 of the support component 9 and is shaped such that, although the second portion 14 overlies the protrusion 8 at the top and sides, a portion 2A of the insulation layer 2 is arranged beneath the protrusion 8 and provides a softer contact point for the protrusion 8.
  • the support component 9 can also comprise a loop, such as of metal or ceramic, having a first portion 13 embedded in the layer 2 and a second portion 14 arranged to overlie the protrusion 8 on the lamp envelope.
  • the support component 9 could be formed of metal wire or strip having a first portion 13 comprising legs embedded in the layer 2 and bent as denoted by reference numerals 13A, 13B to provide secure anchorage in the layer 2.
  • the second portion 14 is arranged to overlie the protrusion 8 on the lamp envelope.
  • the method of the invention in which the first portion 13 of the support component 9 is embedded in the layer 2 simultaneous with the compacting of powder material of layer 2 into the dish 1, makes it possible to optimise the shape of the first portion 13 for achieving firm securing of the component 9 in the layer 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
EP99304661A 1998-06-30 1999-06-15 Verfahren zur Herstellung eines elektrischen Heizstrahlers Withdrawn EP0969698A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9813975 1998-06-30
GB9813975A GB2339131A (en) 1998-06-30 1998-06-30 Mounting an IR lamp in a radiant electric heater

Publications (1)

Publication Number Publication Date
EP0969698A1 true EP0969698A1 (de) 2000-01-05

Family

ID=10834552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99304661A Withdrawn EP0969698A1 (de) 1998-06-30 1999-06-15 Verfahren zur Herstellung eines elektrischen Heizstrahlers

Country Status (2)

Country Link
EP (1) EP0969698A1 (de)
GB (1) GB2339131A (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2301149A1 (fr) * 1975-02-14 1976-09-10 Dietrich & Cie De Procede pour la fixation isolante de resistances electriques sur un support calorifuge
EP0343868A2 (de) * 1988-05-27 1989-11-29 Ceramaspeed Limited Elektrisches Strahlungsheizgerät
EP0429244A2 (de) * 1989-11-21 1991-05-29 Ceramaspeed Limited Elektrische Strahlungsheizgeräte
US5171973A (en) * 1991-01-31 1992-12-15 Ceramaspeed Limited Radiant electric heaters

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5177339A (en) * 1988-05-27 1993-01-05 Ceramaspeed Limited Radiant electric heaters
GB9202036D0 (en) * 1992-01-30 1992-03-18 Redring Electric Ltd A heating unit for a hob
US5701032A (en) * 1994-10-17 1997-12-23 W. L. Gore & Associates, Inc. Integrated circuit package

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2301149A1 (fr) * 1975-02-14 1976-09-10 Dietrich & Cie De Procede pour la fixation isolante de resistances electriques sur un support calorifuge
EP0343868A2 (de) * 1988-05-27 1989-11-29 Ceramaspeed Limited Elektrisches Strahlungsheizgerät
EP0429244A2 (de) * 1989-11-21 1991-05-29 Ceramaspeed Limited Elektrische Strahlungsheizgeräte
US5171973A (en) * 1991-01-31 1992-12-15 Ceramaspeed Limited Radiant electric heaters

Also Published As

Publication number Publication date
GB9813975D0 (en) 1998-08-26
GB2339131A (en) 2000-01-12

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