EP1290917B1 - Elements chauffants electriques perfectionnes - Google Patents
Elements chauffants electriques perfectionnes Download PDFInfo
- 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
Links
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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
- H05B3/20—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)
- 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).
- 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).
- 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).
- 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.
- 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.
- Appareil de chauffage de liquide incluant un élément chauffant à couche épaisse selon l'une quelconque des revendications précédentes.
- 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.
- 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.
- 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.
- 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) ;
- Procédé selon la revendication 10, dans lequel ledit substrat (2) est constitué d'acier inoxydable.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE20218792U1 (de) * | 2001-12-05 | 2003-04-30 | Strix Ltd., Ronaldsway, Isle of Man | Heizgeräte mit mehreren Leistungsstufen |
US8680443B2 (en) | 2004-01-06 | 2014-03-25 | Watlow Electric Manufacturing Company | Combined material layering technologies for electric heaters |
WO2012171072A1 (fr) | 2011-06-16 | 2012-12-20 | Resmed Limited | Humidificateur et élément chauffant stratifié |
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)
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 |
-
2000
- 2000-06-05 GB GB0013687A patent/GB2363307A/en not_active Withdrawn
-
2001
- 2001-05-25 CN CN01813840.3A patent/CN1214694C/zh not_active Expired - Fee Related
- 2001-05-25 AT AT01934150T patent/ATE279846T1/de not_active IP Right Cessation
- 2001-05-25 DE DE60106440T patent/DE60106440T2/de not_active Expired - Fee Related
- 2001-05-25 AU AU2001260456A patent/AU2001260456A1/en not_active Abandoned
- 2001-05-25 EP EP01934150A patent/EP1290917B1/fr not_active Expired - Lifetime
- 2001-05-25 WO PCT/GB2001/002358 patent/WO2001095670A1/fr active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
WO2001095670A1 (fr) | 2001-12-13 |
DE60106440T2 (de) | 2006-03-02 |
AU2001260456A1 (en) | 2001-12-17 |
ATE279846T1 (de) | 2004-10-15 |
CN1214694C (zh) | 2005-08-10 |
GB0013687D0 (en) | 2000-07-26 |
DE60106440D1 (de) | 2004-11-18 |
CN1446440A (zh) | 2003-10-01 |
EP1290917A1 (fr) | 2003-03-12 |
GB2363307A (en) | 2001-12-12 |
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