EP1290917B1 - Verbessertes heizelement - Google Patents

Verbessertes heizelement Download PDF

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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
English (en)
French (fr)
Other versions
EP1290917A1 (de
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/de
Application granted granted Critical
Publication of EP1290917B1 publication Critical patent/EP1290917B1/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
    • H05B3/20—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. Dickfilmheizelement, welches eine mehrschichtige Konstruktion aufweist, in welcher unterschiedliche Heizbahnen (3, 9) auf unterschiedlichen Schichten bereit gestellt sind, die durch elektrisch isolierendes Material (4) getrennt sind, wobei das Element dadurch gekennzeichnet ist, dass: Fensteröffnungen (7, 11, 12) in einer oder mehreren der elektrisch isolierenden Schichten (4, 10) vorgesehen sind, welche die Heizbahnen (3, 9) bedecken, um so Zugriff zu den Anschlussabschnitten (5, 6; 14, 15) der Bahnen (3, 9) zu gewähren.
  2. Dickfilmheizelement gemäß Anspruch 1, umfassend ein Metallsubstrat (2), welches mit einer ersten elektrisch isolierenden Schicht (1), auf welcher wenigstens eine Heizbahn (3) vorgesehen ist, und einer zweiten elektrisch isolierenden Schicht (4) bereit gestellt wird, welche über der ersten elektrisch isolierenden Schicht (1) und der wenigstens einen Heizbahn (3) liegt, wenigstens eine weitere Heizbahn (9), welche auf der zweiten elektrisch isolierenden Schicht (4) bereit gestellt ist, und wobei die Dicke der ersten elektrisch isolierenden Schicht (1) größer ist als jene der zweiten elektrisch isolierenden Schicht (4).
  3. Dickfilmheizelement gemäß Anspruch 1 oder 2, wobei wenigstens eine Fensteröffnung (8, 13) in einer oder mehreren der elektrisch isolierenden Schichten (4, 10) des Elements bereit gestellt ist, um den Zugriff zu wenigstens einer der Heizelementbahnen (3, 9) durch eine wärmeempfindliche Regelung zu ermöglichen.
  4. Dickfilmheizelement gemäß jedem der vorangehenden Ansprüche, wobei eine Hauptheizbahn (3) auf einer Schicht bereit gestellt ist und eine zusätzliche Heizbahn (9) auf einer anderen Schicht gemeinsam mit einem Mittel zum Einstellen der Leistungsabgabe einer solchen zusätzlichen Bahn bereit gestellt ist.
  5. Dickfilmheizelement gemäß Anspruch 4, wobei das Leistungseinstellmittel eine Widerstandsbahn, die mit der zusätzlichen Heizbahn gekoppelt ist, umfasst, wobei die Widerstandsbahn so konfiguriert ist, um zu ermöglichen, dass ihr Widerstand durch den Betrieb einer Regelung, die dazu beigefügt ist, eingestellt wird.
  6. Flüssigkeitsheizgerät, welches ein Dickfilmheizelement gemäß jedem der vorangehenden Ansprüche umfasst.
  7. Flüssigkeitsheizgerät gemäß Anspruch 6, welches eine Hochleistungsheizbahn (3) zum raschen Kochen von Wasser und eine Niedrigleistungsheizbahn (9) zum Wärmen von Milch aufweist, ohne dass die Milch auf dem Heizelement anbrennt.
  8. Flüssigkeitsheizgerät gemäß Anspruch 7, wobei die Hochleistungsheizbahn eine Leistung von 2 bis 3 kW aufweist.
  9. Flüssigkeitsheizgerät gemäß Anspruch 7 oder 8, wobei die Niedrigleistungsheizbahn eine Leistung von 6 bis 700 W aufweist.
  10. Verfahren zur Herstellung eines Dickfilmheizelements, umfassend:
    (i) Herstellen eines Metallsubstrats (2);
    (ii) Bereitstellen einer elektrisch isolierenden Schicht (1) auf der Oberfläche des Substrats;
    (iii)Bereitstellen einer ersten Heizbahn (3) auf der elektrisch isolierenden Schicht;
    (iv) Bereitstellen einer zweiten elektrisch isolierenden Schicht (4), welche über der ersten Heizbahn (3) liegt;
    (v) Bereitstellen einer zweiten Heizbahn (9) auf der zweiten elektrisch isolierenden Schicht (4); und
    (vi) Bereitstellen einer dritten, schützenden elektrisch isolierenden Schicht (10), welche über der zweiten Heizbahn (9) liegt;
    wobei Zugriffsöffnungen (7, 11, 12) in den zweiten und dritten elektrisch isolierenden Schichten (4, 10) bereit gestellt sind, welche den Zugriff auf Anschlussabschnitte (5, 6, 14, 15) der ersten (3) und der zweiten (9) Heizbahn zum Versorgen der Bahnen mit elektrischem Strom ermöglichen.
  11. Verfahren gemäß Anspruch 10, wobei das Substrat (2) rostfreien Stahl umfasst.
EP01934150A 2000-06-05 2001-05-25 Verbessertes heizelement Expired - Lifetime EP1290917B1 (de)

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 (en) 2000-06-05 2001-05-25 Improvements relating to electric heating elements

Publications (2)

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

Family

ID=9893031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01934150A Expired - Lifetime EP1290917B1 (de) 2000-06-05 2001-05-25 Verbessertes heizelement

Country Status (7)

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

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 (de) 2003-03-12
WO2001095670A1 (en) 2001-12-13
AU2001260456A1 (en) 2001-12-17
GB0013687D0 (en) 2000-07-26
DE60106440D1 (de) 2004-11-18

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