EP0131372A1 - Heizapparat - Google Patents

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Publication number
EP0131372A1
EP0131372A1 EP84303729A EP84303729A EP0131372A1 EP 0131372 A1 EP0131372 A1 EP 0131372A1 EP 84303729 A EP84303729 A EP 84303729A EP 84303729 A EP84303729 A EP 84303729A EP 0131372 A1 EP0131372 A1 EP 0131372A1
Authority
EP
European Patent Office
Prior art keywords
heating apparatus
pinch seal
heat
plate
ceramic
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
EP84303729A
Other languages
English (en)
French (fr)
Other versions
EP0131372B1 (de
Inventor
Kenneth Stockwin Frost
Alex Leopold Halberstadt
John Albert Letchford
Peter William Crossley
Robert David Smith
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.)
QED Intellectual Property Ltd
Original Assignee
Thorn EMI Domestic Appliances Ltd
Thorn EMI Patents 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
Priority claimed from GB838316304A external-priority patent/GB8316304D0/en
Priority claimed from GB838316306A external-priority patent/GB8316306D0/en
Application filed by Thorn EMI Domestic Appliances Ltd, Thorn EMI Patents Ltd filed Critical Thorn EMI Domestic Appliances Ltd
Priority to AT84303729T priority Critical patent/ATE43772T1/de
Publication of EP0131372A1 publication Critical patent/EP0131372A1/de
Application granted granted Critical
Publication of EP0131372B1 publication Critical patent/EP0131372B1/de
Expired 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
    • 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
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders

Definitions

  • This invention relates to heating apparatus and in particular, though not exclusively, to such apparatus including one or more sources of infra-red radiation.
  • Heating apparatus of this type is described and claimed in our copending British Application No. 8320717, wherein four quartz-halogen infra-red lamps are supported above a shallow metallic tray containing a layer of insulative material, a layer of glass ceramic material being disposed above the lamps as a hot plate for the heating apparatus, thereby forming a cooking hob.
  • the infra-red lamp is described in more detail and claimed in copending European Application No. 84301636.1, in the name of THORN EMI plc, wherein the lamp comprises a filament supported within a glass tube, each end of the lamp having a pinch seal with an electrical lead connected to a piece of metal foil which is in turn connected to the filament sealed into the respective end thereof, the lead being welded to an appropriate electrical connector.
  • the pinch seal is enclosed within a ceramic housing, which is shaped to provide location of the lamp in the correct position on flanges provided either side of the metallic tray, when the lamp is incorporated within the above-mentioned heating apparatus. ;
  • the highly concentrated heat energy within the apparatus may cause the temperature of the pinch seals to rise above the preferred operating temperature thereof, which is usually at or below approximately 350°C, thereby causing oxidation of the pinch seal and thus reducing the life of the lamp.
  • the ceramic housing has been found to conduct heat to a limited extent from the pinch seal to the supporting flange of the metallic tray, but this may not be sufficient on its own to achieve longevity of the lamp under all operating conditions.
  • the object of the present invention is therefore to alleviate substantially the problem of maintaining a relatively low temperature of the pinch seals.
  • heating apparatus for mounting beneath a hot plate, said apparatus including at least one infra-red lamp, the or each lamp comprising a filament supported within a generally tubular envelope and having, at each end thereof, a pinch seal with an electrical connection to the respective end of the filament sealed therein, characterised in that said apparatus further includes means for conducting heat from said pinch seal in a substantially upward direction towards said hot plate.
  • the pinch seal at each end of the or each lamp is substantially enclosed within a ceramic housing.
  • the means for conducting heat may include a plate of heat-conductive material intimately disposed between the top surface of the ceramic housing and the under surface of the hot plate.
  • a layer of a heat sink compound may also be intimately disposed between the plate of heat conductive material and the under surface of the hot plate, and/or between the plate and the upper surface of the ceramic housing.
  • the means for conducting heat may extend into the ceramic housing through an aperture provided therein, and may take the form of a stud of suitable heat-conductive material, such as aluminium, which is intimately disposed above the upper surface of the pinch seal and the lower surface of the hot plate, the stud extending through the aperture in the ceramic housing.
  • means may also be provided for urging the first-mentioned means in an upward direction towards the hot plate, and these means may comprise nesiliently- mounted support member disposed between the lower surface of the pinch seal, via a second aperture in the ceramic housing, and an upwardly-sprung carrier plate which supports the heating apparatus.
  • heating apparatus includes a generally circular shallow tray 1, preferably made of metal, which has disposed therewithin a layer 2 of insulative material, preferably a material known as Mierotherm.
  • the tray 1 has two extending flanges, 3 and 4, arranged on opposite sides of the rim of the tray 1, each flange having upturned end portions, 5 and 6, respectively.
  • infra-red lamps one being shown at 7, are disposed above the layer 2 of insulative material and are supported at each end by the flanges, 3 and 4.
  • Each infra-red lamp 7 is preferably a quartz-halogenated lamp comprising a tubular quartz envelope 8, within which a tungsten filament 9 is supported. Both ends of each lamp are enclosed within respective ceramic end caps, one being shown at 10, having a location tab 11. The lamps can therefore easily be inserted in apertures provided in the upturned portions, 5 and 6, on the flanges, 3 and 4.
  • the ceramic end cap at each end of the lamps, encloses a pinch seal, one being shown generally at 12, having an amp tag connector, one shown at 14, or any other suitable form of male tab connector, which is connected via metal foil 17 to the respective end of the filament 9, sealed therein. Electrical leads (not shown) can then be connected to each amp tag connector, so as to supply power to each infra-red lamp.
  • the heating apparatus also preferably includes a thermal limiter 10, disposed between the lamps and the layer 2 of insulative material.
  • the thermal limiter 10 is arranged to operate a microswitch 11, so as to disconnect the power to the lamps when the temperature sensed by the thermal limiter 10 reaches a threshold value.
  • the present invention provides, in a first embodiment shown on the flange 3, a respective plate of heat-conductive material, preferably aluminium, disposed above each of the ceramic end caps, one such plate being shown at 15.
  • a layer of glass ceramic (not shown) is disposed above the heating apparatus to provide a glass ceramic cooking hob and, in the present invention, the aluminium plates are intimately disposed between the top surface of the ceramic end caps and the under surface of the glass ceramic layer, thereby encouraging heat from the pinch seals to conduct in an upward direction to the glass ceramic layer.
  • a heat sink compound may also be provi e between, and in contact with, each aluminium plate and the glass ceramic layer, and/or between each plate and the top of each ceramic end cap thereby further improving the upwardly directed heat-conductive path.
  • the heat sink compound has an added advantage of being relatively flexible, so as to allow a certain amount of movement, caused by expansion and contraction of the metallic tray, flanges and/or the aluminium plates.
  • each plate, such as 15, provided separately for covering each end cap is replaced by a single aluminium plate 16, which extends over all of the end caps supported on the flange 4.
  • the plate 16 may then be covered with the heat sink compound, above which the glass ceramic layer is placed.
  • the plates, 15 or 16 may of course be fabricated from any suitable heat-conductive material.
  • FIG 2 shows a third embodiment of the heating apparatus, wherein like parts are labelled with like reference numerals with respect to Figure 1.
  • the flanges 3, 4 are replaced by suitably-shaped pieces of insulative material, 18 and 19, through which the ends of each lamp extend and being shaped so that an equal portion 20 of each lamp is exposed, thereby ensuring that substantially equal amounts of heat are dissipated at the ends of all of the lamps incorporated in the heating apparatus.
  • the third embodiment is provided with studs, shown at 21 and 22, which extend respectively through an aperture in each of ceramic housings, 23 and 24 of the lamp 7, each stud being in thermal contact with the upper surface of the pinch seal within each housing.
  • the top of each stud, 21 and 22, is in contact with the under surface of a layer of glass ceramic, which is disposed above the heating apparatus,to form a hot plate therefor.
  • the stud 22 is intimately disposed between the under surface of layer 25 of glass ceramic material and the top surface of pinch seal 26 which is enclosed within the housing 23, via an aperture 27 in the housing.
  • the stud 22 is fabricated from any suitable heat-conductive material, preferably aluminium, thus providing a good heat-conductive path from the pinch seal 26 to a region of the glass ceramic layer 25 which is relatively cool.
  • the embodiment shown in Figure 3 also includes a support member 28, which is mounted to a carrier plate 29 by means of a screw fixing 30 and which is in contact with the under surface of the pinch seal 26, via a second aperture 31 in the ceramic housing 23.
  • the carrier plate 29, which supports the tray 1 is resiliently mounted to a base plate 32 by a number of pin and spring assemblies, such as at 33, which locate the carrier plate 29 and exert an upward force thereon, thereby urging the heating apparatus upwardly towards the glass ceramic layer 25 so that the top of the tray 1 and the insulative material 19 abuts the underside of the layer 25, thus locating and retaining the infra-red heat generated by the lamps.
  • the pin and spring assembly 33 also urges the support member 28, which is mounted on the carrier plate 29, upwardly, thereby urging the pinch seal 26 into good thermal contact with the stud 22, which in turn is urged into good thermal contact with the glass ceramic layer 25.
  • the stud 22 may be cemented into the aperture 27 and/or a heat conducting cement may be provided between the pinch seal and the stud and between the stud and the glass ceramic layer.
  • Support member 28 may also be cemented into aperture 31.
  • the support member 28 may be formed from a stud of similar shape and size as stud 22 or, alternatively, it may be in the form of a leaf spring, supported by the carrier plate 29 and in contact with the pinch seal 26 via a slot aperture provided in place of circular aperture 31.
  • the stud 22 and support member 28 may have a cross-section which is circular or any other suitable shape, so as to provide optimum thermal conduction.
  • a limited amount of heat may be conducted downwardly via the support member 28, but since the carrier plate 29 is preferably metallic and therefore most likely to be much hotter than the region of the ceramic layer in contact with the stud 22, downward heat conduction should be discouraged.
  • Figures 4 and 5 show a fourth embodiment of the invention, wherein the stud 22 has been replaced by an elliptically-shaped ring 34, made from a suitable heat-conductive material, which may be secured above the pinch seal 26, in thermal contact therewith, by means of slots 35 and 36 provided either side of an aperture 37, which extends across the top of the housing 23.
  • the advantage of this second embodiment is that the ring 34 provides a measure of extra resilience for the glass ceramic layer 25, which is mounted above, and in contact with, the top portion of the ring 34, and thus aids in reducing manufacturing tolerances.
  • the heating apparatus is provided with a flange 38, as in the embodiment shown in Figure 1, to support the ceramic housing 23, the housing having a locating flange 39 at the end thereof to provide positive location of the housing 23 on the supporting flange 38.
  • the flange 38 which is fixed to the side of the tray 1, is therefore also urged upwardly by the pin and spring assembly 33, thereby urging the ring 34 upwardly into contact with the ceramic layer 25.
  • Figure 5 shows a view in the direction of arrow A in Figure 4, indicating the end face of the housing 23, within which the pinch seal 14 is contained, and illustrating the ring 34 in contact with the ceramic layer 25 and the top of the pinch seal 26.
  • a beat-conducting cement may, of course, be provided between the contacting surfaces of the pinch seal and the ring and of the ring and the ceramic layer.
  • the portion of the housing 23 which has been cut out to form the aperture 37 may be replaced after insertion of the ring 34 into its position in contact with the pinch seal 26, thereby aiding in maintaining good contact between the ring and the pinch seal.
  • the Figures show a single coil tungsten filament accommodated within each lamp, but it may however be preferable to employ a coiled coil tungsten filament, which generally possesses substantially greater resilience to mechanical shock than single coil filaments.
  • the present invention provides a heat conductive path extending upwards from the ceramic housing, enclosing each pinch seal of the infra-red lamp, towards the glass ceramic layer, thereby forming an efficient heat sink for each pinch seal, so as to reduce the temperature thereof and consequently to prolong the life of the lamp.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Resistance Heating (AREA)
EP84303729A 1983-06-15 1984-06-04 Heizapparat Expired EP0131372B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84303729T ATE43772T1 (de) 1983-06-15 1984-06-04 Heizapparat.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8316306 1983-06-15
GB8316304 1983-06-15
GB838316304A GB8316304D0 (en) 1983-06-15 1983-06-15 Heating apparatus
GB838316306A GB8316306D0 (en) 1983-06-15 1983-06-15 Heating apparatus

Publications (2)

Publication Number Publication Date
EP0131372A1 true EP0131372A1 (de) 1985-01-16
EP0131372B1 EP0131372B1 (de) 1989-05-31

Family

ID=26286370

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84303729A Expired EP0131372B1 (de) 1983-06-15 1984-06-04 Heizapparat

Country Status (2)

Country Link
EP (1) EP0131372B1 (de)
DE (1) DE3478559D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2259659A1 (de) * 2008-03-31 2010-12-08 Nichias Corporation Lampe und heizvorrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3503649C2 (de) * 1985-02-04 1997-05-22 Ego Elektro Blanc & Fischer Strahlheizkörper für Kochgeräte mit einem Hell- oder Hochtemperatur-Strahlungsheizelement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355574A (en) * 1965-10-01 1967-11-28 Gen Motors Corp Electrical surface heater with plural lamps
GB1282656A (en) * 1969-08-25 1972-07-19 Thermo Electron Corp Cooking range

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132060B (en) * 1982-12-24 1985-12-18 Thorn Emi Domestic Appliances Heating apparatus
GB8308103D0 (en) * 1983-03-24 1983-05-05 Emi Plc Thorn Quartz infra-red lamps

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355574A (en) * 1965-10-01 1967-11-28 Gen Motors Corp Electrical surface heater with plural lamps
GB1282656A (en) * 1969-08-25 1972-07-19 Thermo Electron Corp Cooking range

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2259659A1 (de) * 2008-03-31 2010-12-08 Nichias Corporation Lampe und heizvorrichtung
EP2259659A4 (de) * 2008-03-31 2011-08-24 Nichias Corp Lampe und heizvorrichtung

Also Published As

Publication number Publication date
EP0131372B1 (de) 1989-05-31
DE3478559D1 (en) 1989-07-06

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