EP1145598A3 - Verbesserungen an elektrisch geheisste elementen - Google Patents

Verbesserungen an elektrisch geheisste elementen

Info

Publication number
EP1145598A3
EP1145598A3 EP99939537A EP99939537A EP1145598A3 EP 1145598 A3 EP1145598 A3 EP 1145598A3 EP 99939537 A EP99939537 A EP 99939537A EP 99939537 A EP99939537 A EP 99939537A EP 1145598 A3 EP1145598 A3 EP 1145598A3
Authority
EP
European Patent Office
Prior art keywords
track
heating element
ptcr
thick film
ntcr
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
EP99939537A
Other languages
English (en)
French (fr)
Other versions
EP1145598B1 (de
EP1145598A2 (de
Inventor
Robert Andrew O'neill
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 EP1145598A2 publication Critical patent/EP1145598A2/de
Publication of EP1145598A3 publication Critical patent/EP1145598A3/de
Application granted granted Critical
Publication of EP1145598B1 publication Critical patent/EP1145598B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H05B1/0213—Switches using bimetallic 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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0269—For heating of fluids
    • 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
    • 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
    • H05B2203/019—Heaters using heating elements having a negative temperature coefficient
    • 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
    • H05B2203/02—Heaters using heating elements having a positive temperature coefficient

Definitions

  • This invention concerns improvements relating to electric heating elements and more particularly concerns electric heating elements of the so-called thick film type which comprise a resistance heating track or layer formed on a substrate, for example a printed ink track formed on a stainless steel substrate with an insulating layer between the substrate and the track and,
  • a further insulating layer overlying the track.
  • the invention is particularly concerned with thick film heating elements for water boiling
  • vessels such as domestic kettles and hot water jugs for example, but is capable of wider application.
  • Controls are well known which are adapted to switch off the power
  • kettles and hot water jugs are operated on a slope, for example with the
  • any part of the heating element track can occur, leading to failure of the heating element, if any part of the heating element track is exposed above the water level in the appliance. Because thick film heating elements have low thermal mass and limited lateral heat transfer capability, any part of the heating element track exposed above the water level suffers a rapid temperature rise which can result in failure of the element. This can happen if, for example, the lid of a kettle is left off so that
  • the proposal is made to array a plurality of PTCR (positive temperature coefficient of resistance) or other sensors around the heating element periphery
  • heating element can be subject to overheating before any other part.
  • a thick film heating element According to the present invention, a thick film heating element
  • NTCR negative temperature coefficient of resistance
  • one of the NTCR track portions will be exposed first if the heating element
  • PTCR track portion will rise, thereby increasing its resistance so that an increased proportion of the supply voltage appears across it. This leads to a disproportionate increase in the power dissipated in the PTCR track portion, thereby raising its temperature even if it is still below the water level.
  • the heating element overtemperature protection device which will switch off the heating element before any of the main heater portion is exposed above the water level, thus preventing any damage.
  • the arrangement can be such that the PTCR track section is distributed with the NTCR track sections about the main heater portion of the heating element.
  • the PTCR track portion can be the portion first exposed as the heating element boils dry. This will result in the temperature of the PTCR track section increasing, enhanced by the PTCR
  • Figure 1 is a schematic showing of the track layout of an exemplary
  • Figure 2 is a schematic circuit diagram representative of the track layout shown in Figure 1.
  • FIG. 1 shown therein is a plan view of the track layout of a thick film heating element embodying the present invention. It is to
  • the thick film heating element 1 of Figure 1 might for example comprise a stainless steel disc substrate having an electrically insulating layer,
  • the track pattern is then formed onto the insulating layer, for example by a screen
  • An overlying electrically insulating layer for example of
  • glass may then be provided on top of the track pattern to protect the same.
  • the track pattern comprises a main heater portion 2
  • terminal portions 7 and 9 also connect to the array of NTCR track portions 3 and the series-connected PTCR track section 5.
  • FIG. 1 shows the schematic circuit diagram of the arrangement of the
  • heating element is operated on a slope and boils dry, for example
  • the resistance of the PTCR track is 1/16 of the resistance of each of the NTCR tracks, assuming an NTCR and PTCR of 0.006/°C, which is typical
  • the sensor tracks would have a power output of 28 watts each. If
  • the track layout shown is only one possible configuration. A different
  • NTCR track portions could be used in parallel, or only one, in series
  • NTCR track portions means that they must each cover a greater arc
  • the invention could be adapted to heating elements of any profile.
  • the PTCR track portion is placed on the element periphery, aligned with the NTCR track portions but the PTCR track
  • portion could be located anywhere on the heating element, for example to align with our X4 protection system which is described in our British Patent Application No. 9808484.1.
  • the slope protection system of the present invention may be combined with other element control systems, for example the steamless control system
  • the PTCR track could be arranged to operate one of the
  • bimetals required.
  • two NTCR/PTCR circuits could be used, each PTCR track operating one of the X4's bimetals. The limit to such
  • a feature of this invention is that it can give rise to an unstable circuit
  • a further variation of the present invention would be to switch only the

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Resistance Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Thermally Actuated Switches (AREA)
EP99939537A 1998-08-12 1999-08-12 Verbesserungen an elektrischen heizelementen Expired - Lifetime EP1145598B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9817594A GB2340713B (en) 1998-08-12 1998-08-12 Improvements relating to electric heating elements
GB9817594 1998-08-12
PCT/GB1999/002664 WO2000010364A2 (en) 1998-08-12 1999-08-12 Improvements relating to electric heating elements

Publications (3)

Publication Number Publication Date
EP1145598A2 EP1145598A2 (de) 2001-10-17
EP1145598A3 true EP1145598A3 (de) 2002-09-11
EP1145598B1 EP1145598B1 (de) 2003-07-16

Family

ID=10837151

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99939537A Expired - Lifetime EP1145598B1 (de) 1998-08-12 1999-08-12 Verbesserungen an elektrischen heizelementen

Country Status (7)

Country Link
EP (1) EP1145598B1 (de)
CN (1) CN1143596C (de)
AT (1) ATE245335T1 (de)
AU (1) AU5380699A (de)
DE (1) DE69909654T2 (de)
GB (1) GB2340713B (de)
WO (1) WO2000010364A2 (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2851404A1 (fr) * 2003-02-18 2004-08-20 Acome Soc Coop Travailleurs Dispositif a cable chauffant ctp comprenant un dispositif de limitation de courant
GB0700079D0 (en) * 2007-01-04 2007-02-07 Boardman Jeffrey A method of producing electrical resistance elements whihc have self-regulating power output characteristics by virtue of their configuration and the material
PL2106195T3 (pl) 2008-03-28 2010-09-30 Braun Gmbh Element grzewczy z czujnikiem temperatury
ES2447780T3 (es) * 2008-03-28 2014-03-12 Braun Gmbh Elemento de calentamiento con control de la temperatura
GB2460833B (en) * 2008-06-09 2011-05-18 2D Heat Ltd A self-regulating electrical resistance heating element
GB0911410D0 (en) * 2009-07-01 2009-08-12 Mantock Paul L A low power electric heating system
DE102011002861A1 (de) * 2011-01-19 2012-07-19 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine mit zumindest einer Heizung zur Erwärmung von umlaufender Flüssigkeit
CN110197749B (zh) * 2018-02-27 2022-03-22 香港理工大学 一体化加热器及其温度传感方法
KR102110417B1 (ko) 2018-08-21 2020-05-13 엘지전자 주식회사 전기 히터
KR102177948B1 (ko) 2018-10-16 2020-11-12 엘지전자 주식회사 전기 히터
CN109688645B (zh) * 2019-01-24 2021-08-10 广西桂仪科技有限公司 一种陶瓷厚膜直发加热器及其制备工艺
DE102020115017A1 (de) * 2020-06-05 2021-12-09 Eugen Forschner Gmbh Elektrische schaltung für ein fluidleitungssystem
CN112747832B (zh) * 2020-12-24 2022-04-12 华中科技大学 一种制热和自馈温融合型传感器及其应用

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2185161B (en) * 1985-12-09 1990-03-21 Otter Controls Ltd Controls for electrically powered heating elements
US4849611A (en) * 1985-12-16 1989-07-18 Raychem Corporation Self-regulating heater employing reactive components
GB2228396A (en) * 1989-02-20 1990-08-22 Emaco Electric hotplate
GB8924936D0 (en) * 1989-11-04 1989-12-28 Ceramaspeed Ltd Radiant electric heaters
DE4317040A1 (de) * 1993-05-21 1994-04-28 Schott Glaswerke Glaskeramikkochfeld mit wenigstens einer Kochzone und einer zugeordneten Anzeigeeinrichtung
JPH06342686A (ja) * 1993-06-01 1994-12-13 Matsushita Electric Ind Co Ltd 電気発熱装置
GB2296847B (en) * 1994-11-30 1999-03-24 Strix Ltd Electric heaters

Also Published As

Publication number Publication date
CN1143596C (zh) 2004-03-24
EP1145598B1 (de) 2003-07-16
DE69909654D1 (de) 2003-08-21
AU5380699A (en) 2000-03-06
GB2340713B (en) 2003-03-12
WO2000010364A3 (en) 2001-11-08
DE69909654T2 (de) 2004-04-15
WO2000010364A2 (en) 2000-02-24
CN1344482A (zh) 2002-04-10
ATE245335T1 (de) 2003-08-15
GB9817594D0 (en) 1998-10-07
GB2340713A (en) 2000-02-23
EP1145598A2 (de) 2001-10-17

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