IE36343B1 - Electric apparatus for boiling liquids - Google Patents

Electric apparatus for boiling liquids

Info

Publication number
IE36343B1
IE36343B1 IE577/72A IE57772A IE36343B1 IE 36343 B1 IE36343 B1 IE 36343B1 IE 577/72 A IE577/72 A IE 577/72A IE 57772 A IE57772 A IE 57772A IE 36343 B1 IE36343 B1 IE 36343B1
Authority
IE
Ireland
Prior art keywords
thermistor
transistor
temperature
liquid
heating element
Prior art date
Application number
IE577/72A
Other versions
IE36343L (en
Original Assignee
Belling & Co 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 Belling & Co Ltd filed Critical Belling & Co Ltd
Publication of IE36343L publication Critical patent/IE36343L/en
Publication of IE36343B1 publication Critical patent/IE36343B1/en

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
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0269—For heating of fluids
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/21—Water-boiling vessels, e.g. kettles
    • A47J27/21008—Water-boiling vessels, e.g. kettles electrically heated
    • A47J27/21058—Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water
    • A47J27/21091—Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water of electronic type
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Food Science & Technology (AREA)
  • Apparatus For Making Beverages (AREA)
  • Control Of Temperature (AREA)
  • Cookers (AREA)

Abstract

1356502 Kettles &c. BELLING & CO Ltd 3 May 1972 [4 May 1971] 20683/72 Heading A4A [Also in Division G3] A liquid boiler heated by an electric heating element 2 has an electronic temperature sensor 8 exposed to liquid vapour when the liquid boils, the sensor being connected electrically to a current controlled switch device 4, 5 to interrupt the supply to the element 2 when the liquid boils. The term electronic temperature sensor is intended to include any device which has a temperature responsive electric-variable whose temperature coefficient is higher than the resistance/temperature coefficient of metals. In the embodiments described the sensor 8 is a thermistor with a positive or negative resistance/ temperature coefficient. As shown, the heating element 2 is supplied from A.C. supply 14 by relay contacts 4. A full wave-rectifier 16 supplies energizing current to relay coil 5 by way cf a smoothing capacitor 17. A normally non-conducting transistor 18 shunts the coil 5. A steam sensitive thermistor 8 is connected in the base emitter path of the transistor 18. When the temperature of thermistor 8 rises sufficiently it permits the transistor 18 to conduit. The relay coil 5 is thereby de-energized to open contacts 4. A second "bail dry" thermistor 8a which is thermally connected to the heating element 2 to sense its temperature is connected in parallel to the thermistor 8. In an alternative embodiment a normally conducting transistor is connected in series with the relay coil 5, and the thermistor is connected to its base to render it non-conducting when the liquid bails. In one embodiment the relay coil is shunted by a thyristor whose trigger electrode is connected to the thermistor 8. The relay may be replaced by a thyristor, a thyristor pair or a triac triggered directly by the thermistor or via a transistor. The thermistor 8 may be mounted in a steam duct in the housing of an electric kettle, in a washing machine, coffee percolator, or fat frier. The thermistor 8 may act to permanently de-energize the heating element on boiling, or it may cause the element to be switched on and off to keep the liquid temperature constant. The thermistor may be replaced by a semiconductor diode or a transistor. (From GB1356502 A) [FR2135412A1]
IE577/72A 1971-05-04 1972-05-01 Electric apparatus for boiling liquids IE36343B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR717115967A FR2135412B1 (en) 1971-05-04 1971-05-04

Publications (2)

Publication Number Publication Date
IE36343L IE36343L (en) 1972-11-04
IE36343B1 true IE36343B1 (en) 1976-10-13

Family

ID=9076364

Family Applications (1)

Application Number Title Priority Date Filing Date
IE577/72A IE36343B1 (en) 1971-05-04 1972-05-01 Electric apparatus for boiling liquids

Country Status (6)

Country Link
AU (1) AU4184972A (en)
CA (1) CA972021A (en)
DE (1) DE2221906A1 (en)
FR (1) FR2135412B1 (en)
GB (1) GB1356502A (en)
IE (1) IE36343B1 (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3143450C2 (en) * 1981-11-03 1986-05-22 ABC-Elektrogeräte Volz, GmbH & Co, 7312 Kirchheim Electrically heated kettle
DE3311393A1 (en) * 1983-03-29 1984-10-04 Inter Control Hermann Köhler Elektrik GmbH & Co KG, 8500 Nürnberg Household appliance, namely water heater
AU6635886A (en) * 1985-12-09 1987-06-11 Otter Controls Ltd. Heating element control
GB8615279D0 (en) * 1986-06-23 1986-07-30 Procter Silex Canada Inc Electronic kettle
DE3720720A1 (en) * 1987-06-23 1989-01-05 Bosch Siemens Hausgeraete Energy transmission for wire-free domestic appliances
US5038752A (en) * 1989-10-25 1991-08-13 Bunn-O-Matic Corporation Boiling water dispenser having improved water temperature control system
DE4128467A1 (en) * 1991-05-22 1992-11-26 Braun Ag TEMPERATURE SENSOR FOR A BREW BEVERAGE PREPARATION MACHINE
DE4204942A1 (en) * 1992-02-19 1993-08-26 Braun Ag MULTIPURPOSE KITCHEN MACHINE
GB2294187A (en) * 1994-10-14 1996-04-17 Philips Electronics Nv Thermal control in a liquid heater
GB2378818B (en) * 1999-02-11 2003-06-11 Otter Controls Ltd Improvements relating to control of electric heating elements
DE29910816U1 (en) * 1999-06-22 2000-07-13 Wismeth Wolfgang Device for the disinfection of aqueous solutions
GB2407478B (en) * 2003-10-28 2005-09-28 Tarquin Andrew Richard Stehle Domestic electronic kettle
US7706671B2 (en) 2005-03-16 2010-04-27 B2M Asset Management, Llc Multi-function liquid container
GB0519593D0 (en) * 2005-09-26 2005-11-02 Strix Ltd Liquid heating vessels
US8097834B2 (en) 2007-06-28 2012-01-17 Strix Limited Liquid heating vessels
US7783176B2 (en) 2007-06-28 2010-08-24 Strix Limited Heaters for liquid heating vessels
CN111513562B (en) * 2020-05-27 2022-02-01 成都探寻家科技有限公司 Power control method and electric water boiling cup
CN113741578B (en) * 2020-05-29 2024-02-02 东莞捷璞电子科技有限公司 Control circuit and control method for constant-temperature water

Also Published As

Publication number Publication date
FR2135412A1 (en) 1972-12-22
GB1356502A (en) 1974-06-12
AU4184972A (en) 1973-12-20
IE36343L (en) 1972-11-04
CA972021A (en) 1975-07-29
FR2135412B1 (en) 1973-05-11
DE2221906A1 (en) 1972-11-23

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