EP1290917B1 - Elements chauffants electriques perfectionnes - Google Patents

Elements chauffants electriques perfectionnes Download PDF

Info

Publication number
EP1290917B1
EP1290917B1 EP01934150A EP01934150A EP1290917B1 EP 1290917 B1 EP1290917 B1 EP 1290917B1 EP 01934150 A EP01934150 A EP 01934150A EP 01934150 A EP01934150 A EP 01934150A EP 1290917 B1 EP1290917 B1 EP 1290917B1
Authority
EP
European Patent Office
Prior art keywords
heating
track
electrically insulating
insulating layer
thick film
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
EP01934150A
Other languages
German (de)
English (en)
Other versions
EP1290917A1 (fr
Inventor
David Andrew Smith
Robin Keith Moore
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.)
Otter Controls Ltd
Original Assignee
Otter Controls 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 Otter Controls Ltd filed Critical Otter Controls Ltd
Publication of EP1290917A1 publication Critical patent/EP1290917A1/fr
Application granted granted Critical
Publication of EP1290917B1 publication Critical patent/EP1290917B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
    • 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
    • H05B2203/013—Heaters using resistive films or coatings
    • 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
    • H05B2203/017—Manufacturing methods or apparatus for heaters

Definitions

  • This invention concerns improvements relating to electric heating elements and more particularly concerns thick film heating elements which comprise a resistive heating track or layer formed on a substrate which commonly comprises stainless steel with an electrically insulating layer between the stainless steel and the resistive heating track or layer, though ceramics material substrates are also known.
  • thick film heating elements are nowadays used in liquid heating appliances, such as kettles and hot water jugs for example, and also find wider application.
  • An example of an appliance where this is the case is one which is intended to heat a range of different liquids, where a high power (2-3kW) is needed for rapid boiling of water, and a lower power (6-700W), and lower power density, is needed for heating milk, without the milk becoming burnt on the base of the vessel.
  • the low power density of the lower power track means that it cannot be tightly laid into a small area, but may occupy as much space as the high powered track.
  • a large element diameter to give sufficient area is not desirable, since this leads to appliance styling difficulties and high costs.
  • US Patent No. 5 560 851 is illustrative of a previously proposed electric heating element (and manufacturing process) of multilayer construction, wherein respective heating conductors at different layers are interconnected by means of contact recesses in intervening insulating layers which are filled with metallizing paste.
  • this object can be achieved by a thick film heating element according to claim 1.
  • the withstand voltage for the intermediate layer does not have to be as great as the basic insulation required between the mean heating element and the steel substrate which has to withstand a high voltage test of 1250V.
  • the intermediate layer would only have to withstand 250V, perhaps with a high voltage test of only 500V.
  • the intermediate insulating layer can be thinner than the main insulation, say 60-80 ⁇ m (60-80 microns) compared to 150 ⁇ m (150 microns) for example.
  • the increased total insulating thickness between the additional track(s) and the substrate will raise the running temperature of that track, but since we are aiming for a low power density, the resulting temperature rise will be acceptance.
  • the reduced thickness of the intermediate layer will also assist in keeping temperature rises down.
  • a manufacturing process for a thick film heating element is defined in claim 10.
  • a preferred embodiment of that method might for example comprise the following steps: .
  • the additional track(s) may include other features, such as an adjustable resistance control track as described in our aforementioned British Patent Application No. 2 354 927 for example, and tappings from either track may be provided to give access for controls or indicators, similar to that described in our GB-A-2 329 759 or GB-A-2 325 396. Connections to the underlying track could be made through holes in the intermediate insulating layer, and access to the tracks for bimetal or other sensors can also be similarly provided.
  • Figure 1A illustrates the provision of a dielectric layer 1 on one surface of a stainless steel substrate 2.
  • the dielectric material can for example consist of a glass, ceramics or glass ceramics material which is applied onto the surface of the substrate in powder form and is then fired, as is well known.
  • Figure 1B shows the provision of a main heater track 3 on top of the dielectric layer 1, for example by means of a printing step employing electrically conductive ink followed by a firing step. Note that the form of the track 3 that is shown in Figure 1B is exemplary only.
  • Figure 1C illustrates the provision of an intermediate electrically insulating layer 4 over the track 3, but with connector terminal parts 5 and 6 of the track 3 left exposed in a window opening 7 provided in the layer 4.
  • a second window opening 8 exposes a portion of the main heater track 3 for access by a thermally-responsive control (not shown).
  • Figure 1D shows the provision of a further heating element track 9 on top of the intermediate electrically insulating layer 4
  • Figure 1E shows the provision of a further, protective electrically insulating layer 10 overlying the further heating element track 9, the layer 10 being formed with window openings 11, 12 and 13 which, respectively, register with the window opening 7 in the intermediate insulating layer 4, provide access to the terminal parts 14 and 15 of the heating element track 9, and expose a portion of the additional heating element track 9 for access by a further thermally-responsive control (not shown).
  • terminal parts 5, 6, 14 and 15 are provided with low resistance silver coatings which may also be provided, as is well known, at the locations where the heating element tracks 3, 9 turn back upon themselves so as to avoid the phenomenon of current crowding.
  • Figure 2 is a perspective cross-sectional view of a thick film heating element manufactured as described above. It is to be noted that the thicknesses of the various layers are greatly exaggerated for the sake of clarity.

Landscapes

  • Surface Heating Bodies (AREA)
  • Resistance Heating (AREA)
  • Control Of Resistance Heating (AREA)

Claims (11)

  1. Elément chauffant à couche épaisse ayant une construction multicouche, dans lequel différentes pistes de chauffage (3, 9) sont prévus sur différentes couches qui sont séparées par un matériau isolant électriquement (4), l'élément étant caractérisé en ce que : des ouvertures de fenêtres (7, 11, 12) sont prévues sur une ou plusieurs couches isolant électriquement (4, 10) qui couvrent les pistes de chauffage (3, 9) afin de fournir un accès aux parties d'extrémité (5, 6 ; 14, 15) des pistes (3, 9).
  2. Elément chauffant à couche épaisse selon la revendication 1, comprenant un substrat métallique (2) pourvu d'une première couche isolante électriquement (1) sur laquelle est prévu au moins une piste de chauffage (3) et d'une deuxième couche isolante électriquement (4) recouvrant ladite première couche isolante électriquement (1) et ladite au moins une piste de chauffage (3), au moins une autre piste de chauffage (9) étant prévu sur ladite deuxième couche isolante électriquement (4), et dans lequel l'épaisseur de ladite première couche isolante électriquement (1) est supérieure à celle de ladite deuxième couche isolante électriquement (4).
  3. Elément chauffant à couche épaisse selon la revendication 1 ou 2, dans lequel au moins une ouverture de fenêtre (8, 13) est prévue sur une ou plusieurs des couches isolante électriquement (4, 10) de l'élément pour permettre l'accès par une commande thermiquement réactive à au moins l'une des pistes de l'élément de chauffage (3, 9).
  4. Elément chauffant à couche épaisse selon l'une quelconque des revendications précédentes, dans lequel une piste de chauffage principale (3) est prévu sur une couche et une piste de chauffage additionnelle (9) est prévue sur une autre couche, avec un moyen pour ajuster la puissance de sortie d'une telle piste additionnelle.
  5. Elément chauffant à couche épaisse selon la revendication 4, dans lequel ledit moyen d'ajustement comprend une piste réactive couplée à ladite piste de chauffage additionnelle, ladite piste réactive étant configurée pour permettre d'ajuster sa résistance en se servant d'une commande associée à celle-ci.
  6. Appareil de chauffage de liquide incluant un élément chauffant à couche épaisse selon l'une quelconque des revendications précédentes.
  7. Appareil de chauffage de liquide selon la revendication 6, comprenant une piste de chauffage de forte puissance (3) pour faire bouillir rapidement l'eau et une piste de chauffage de faible puissance (9) pour chauffer le lait sans que le lait brûle sur l'élément chauffant.
  8. Appareil de chauffage de liquide selon la revendication 7, dans lequel ladite piste de chauffage de forte puissance a une puissance comprise entre 2 kW et 3 kW.
  9. Appareil de chauffage de liquide selon la revendication 7 ou 8, dans lequel ladite piste de chauffage de faible puissance a une puissance comprise entre 6 W et 700 W.
  10. Procédé pour la fabrication d'un élément chauffant à couche épaisse comprenant :
    (i) la préparation d'un substrat métallique (2) ;
    (ii) la pose d'une couche isolante électriquement (1) sur une surface dudit substrat ;
    (iii) la pose d'une première piste de chauffage (3) sur ladite couche isolante électriquement ;
    (iv) la pose d'une deuxième couche isolante électriquement (4) recouvrant ladite première piste de chauffage (3) ;
    (v) la pose d'une seconde piste de chauffage (9) sur ladite deuxième couche isolante électriquement (4) ; et
    (vi) la pose d'une troisième couche isolante électriquement (10) recouvrant ladite seconde piste de chauffage (9) ;
       dans lequel des ouvertures de fenêtres (7, 11, 12) sont prévues sur lesdites deuxième et troisième couches isolantes électriquement (4, 10) qui permettent l'accès aux parties d'extrémité (5, 6 ; 14, 15) desdites première (3) et seconde (9) pistes de chauffage pour l'alimentation électrique des pistes.
  11. Procédé selon la revendication 10, dans lequel ledit substrat (2) est constitué d'acier inoxydable.
EP01934150A 2000-06-05 2001-05-25 Elements chauffants electriques perfectionnes Expired - Lifetime EP1290917B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0013687A GB2363307A (en) 2000-06-05 2000-06-05 Thick film heating element stack
GB0013687 2000-06-05
PCT/GB2001/002358 WO2001095670A1 (fr) 2000-06-05 2001-05-25 Elements chauffants electriques perfectionnes

Publications (2)

Publication Number Publication Date
EP1290917A1 EP1290917A1 (fr) 2003-03-12
EP1290917B1 true EP1290917B1 (fr) 2004-10-13

Family

ID=9893031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01934150A Expired - Lifetime EP1290917B1 (fr) 2000-06-05 2001-05-25 Elements chauffants electriques perfectionnes

Country Status (7)

Country Link
EP (1) EP1290917B1 (fr)
CN (1) CN1214694C (fr)
AT (1) ATE279846T1 (fr)
AU (1) AU2001260456A1 (fr)
DE (1) DE60106440T2 (fr)
GB (1) GB2363307A (fr)
WO (1) WO2001095670A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20218792U1 (de) * 2001-12-05 2003-04-30 Strix Ltd Heizgeräte mit mehreren Leistungsstufen
US8680443B2 (en) 2004-01-06 2014-03-25 Watlow Electric Manufacturing Company Combined material layering technologies for electric heaters
CN103747828B (zh) * 2011-06-16 2017-07-28 瑞思迈有限公司 加湿器和层式加热元件
US11225001B2 (en) * 2018-04-25 2022-01-18 Matriq Ag Mold and device for marking work pieces
GB2618803A (en) * 2022-05-17 2023-11-22 Dyson Technology Ltd Thick film heating elements

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153190B (en) * 1984-01-14 1987-09-09 Emi Ltd Improvements in or relating to heaters for water vessels
DE3810586A1 (de) * 1988-03-29 1989-10-12 Ego Elektro Blanc & Fischer Beheizung fuer elektrische kochgeraete
US5157240A (en) * 1989-09-13 1992-10-20 Chow Loren A Deposition heaters
GB9211331D0 (en) * 1992-05-28 1992-07-15 Chinacraft Ltd Hot plate for food
DE4338539A1 (de) * 1993-11-11 1995-05-18 Hoechst Ceram Tec Ag Verfahren zum Herstellen von keramischen Heizelementen
GB9423900D0 (en) * 1994-11-26 1995-01-11 Pifco Ltd Improvements to thick film elements

Also Published As

Publication number Publication date
ATE279846T1 (de) 2004-10-15
DE60106440T2 (de) 2006-03-02
GB2363307A (en) 2001-12-12
CN1446440A (zh) 2003-10-01
CN1214694C (zh) 2005-08-10
EP1290917A1 (fr) 2003-03-12
WO2001095670A1 (fr) 2001-12-13
AU2001260456A1 (en) 2001-12-17
GB0013687D0 (en) 2000-07-26
DE60106440D1 (de) 2004-11-18

Similar Documents

Publication Publication Date Title
EP1029425B1 (fr) Dispositif de chauffage a quartz
EP0958712B1 (fr) Thermoplongeur
US5177341A (en) Thick film electrically resistive tracks
US6046438A (en) Thick film heating element with thermal sensor disposed in thinner part of substrate
GB2481265A (en) Flow heater with thick film heaters; Associations of thick film elements with heat dissipaters
EP2215889B1 (fr) Appareil de chauffage à manchon stratifié résistant à l'humidité et procédé pour sa fabrication
EP1290917B1 (fr) Elements chauffants electriques perfectionnes
JPS6344792A (ja) 電気部品およびその製造方法
US20040074893A1 (en) Ceramic hotplate consisting of a glass ceramic plate
JP2010506754A (ja) ホットランナーシステム用電気式加熱装置
EP1041586B1 (fr) Puce comprenant un thermistor
CN101728037A (zh) 具有导热层结构的晶片电阻
JP2756590B2 (ja) 電気湯沸かし器等に利用できるセラミックスヒータ
JPH04365303A (ja) 正抵抗温度係数発熱体およびその製造方法
JPS6369184A (ja) 電熱ユニツト
CA2291381A1 (fr) Plaque chauffante electrique
WO1997014269A1 (fr) Dispositifs de chauffage electriques
EP1172021A1 (fr) Amelioration d'elements de chauffage
GB2136206A (en) Fused ceramic capacitor
JPS6052364A (ja) サ−マルヘッドおよびその製造方法
MXPA06007798A (es) Tecnologia de estratificacion de materiales combinados para calentadores electricos
JP2001102151A (ja) 積層型ヒータの端子接続構造、その接続方法およびそれに用いるロウ付け材
JPS61284084A (ja) 面ヒ−タ
JPS6259428B2 (fr)
JPS603882A (ja) 発熱板

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20021227

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

17Q First examination report despatched

Effective date: 20031215

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20041013

Ref country code: CH

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20041013

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20041013

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20041013

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20041013

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20041013

Ref country code: LI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20041013

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 60106440

Country of ref document: DE

Date of ref document: 20041118

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050113

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050113

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050113

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050124

LTIE Lt: invalidation of european patent or patent extension

Effective date: 20041013

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050525

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050525

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050525

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050531

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

ET Fr: translation filed
26N No opposition filed

Effective date: 20050714

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050313

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20080630

Year of fee payment: 8

Ref country code: NL

Payment date: 20080524

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20080529

Year of fee payment: 8

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20090525

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20091201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20091201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20100129

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090602

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20080519

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090525

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20091201