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WO2001064084A1 - Commande de recipients chauffant pour liquides - Google Patents

Commande de recipients chauffant pour liquides Download PDF

Info

Publication number
WO2001064084A1
WO2001064084A1 PCT/GB2001/000817 GB0100817W WO0164084A1 WO 2001064084 A1 WO2001064084 A1 WO 2001064084A1 GB 0100817 W GB0100817 W GB 0100817W WO 0164084 A1 WO0164084 A1 WO 0164084A1
Authority
WO
WIPO (PCT)
Prior art keywords
appliance
heating element
temperature
bimetal
control
Prior art date
Application number
PCT/GB2001/000817
Other languages
English (en)
Inventor
Robert Andrew O'neill
Robin Keith Moore
Original Assignee
Otter Controls Limited
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 Limited filed Critical Otter Controls Limited
Priority to AU2001233972A priority Critical patent/AU2001233972A1/en
Publication of WO2001064084A1 publication Critical patent/WO2001064084A1/fr

Links

Classifications

    • 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
    • A47J27/21108—Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water using a bimetallic element

Definitions

  • This invention concerns ements relating to liquid heating vessels and controls therefor and more particularly concerns elect ⁇ cally powered water heating vessels such as percolators and cafetieres for example wherein there is a requirement to heat water relatively quickly to a first operating temperature of the appliance and thereafter to keep the hot water warm
  • Such vessels might for example comp ⁇ se a mam heating element and an auxiliary heating element which can either be energized instead of the mam heating element or can be connected in se ⁇ es with the main heating element to reduce the overall power output after the main heating element b ⁇ ngs the vessel contents quickly up to temperature
  • Controls for kettles and hot water jugs are well known which are designed to protect the heating element of the appliance against overheating on account of the appliance being switched on empty or being allowed to boil dry
  • Such dry boil controls have conventionally comp ⁇ sed p ⁇ mary and secondary thermally-responsive actuators arranged to be held in close thermal contact with the appliance heating element, the p ⁇ mary actuator being designed to switch off the power supply to the appliance heating element m response to its temperature ⁇ smg above a predetermined level and the secondary actuator providing a back-up facility which is operable in the event of failure of the p ⁇ mary to switch off the heating element
  • the thermally-responsive actuators of such controls have commonly been bimetallic actuators, particularly though not exclusively snap-acting bimetallic-actuators, though fusible component type actuators have also been employed, particularly for the secondary actuator
  • WO-A-99/54903 and the U se ⁇ es of controls which are manufactured and sold by St ⁇ x Ltd. and which are substantially as desc ⁇ bed m WO-A-95/34187
  • Both of these se ⁇ es of controls include an integrated control cum 360° appliance inlet connector adapted for use with a cordless elect ⁇ c kettle or hot water jug, particularly a kettle or hot water jug incorporating a thick film heating element, and the two thermally responsive actuators of these controls are snap-acting bimetals which are set to nominally the same operating temperature, it being appreciated that two bimetals can act as p ⁇ mary and secondary or back-up protectors without having to be set to different operating temperatures
  • the present invention relates to yet a further modification, particularly though not exclusively of an X4 control as aforementioned, which is useful in an electrically operated cafetiere.
  • a cafetiere as commonly used for making coffee, comprises a vessel provided with a filter which can be manually depressed through the vessel body so as to filter out coffee grounds from a hot water infusion and leave behind coffee ready for drinking.
  • Conventional cafetieres do not have their own heating element and are intended to be used with water boiled in a kettle or hot water jug.
  • the present invention proposes to provide a cafetiere with its own heating element, preferably a thick film heating element having main and keep warm heating facilities, and to provide a control associated with the heating element and having first and second bimetallic actuators, the first actuator being responsive at or around a normal use temperature for beverage prepared in the cafetiere and being operative to reduce the heating power of the heating element to a keep warm level and the second actuator being responsive at a much higher temperature such as would be encountered if the cafetiere were to be switched on empty or were to be allowed to boil dry
  • the heating element of such a cafetiere can advantageously have mam, high power and auxiliary, low power sections and the arrangement of the first (low temperature) actuator can be such as either to connect the low power section in circuit m place of the high power section or to connect the two sections in se ⁇ es, the result in either case being a reduction in the heating power output ot the heating element
  • Such a dual power level heating element can advantageously and ⁇ ery conveniently be constructed using thick film technology
  • Thick film heating elements are currently very popular and becoming increasingly so m water boiling kettles and hot water jugs and their construction is well known in the water heating appliance art
  • the two actuators are each generally rectangular, dished bimetallic blades having an X-shaped cut-out which increases the movement that is available from the blade for operating a push-rod to open a set of switch contacts when the blade snaps from its cold to its hot, oppositely dished configuration
  • This kind of bimetallic actuator is optimised for operation at high temperatures of the order of, say, 200°C and above such as would only ever be expe ⁇ enced in a water heating appliance if the appliance were to be switched on empty or allowed to boil dry
  • this kind of bimetallic actuator exhibits a wide temperature differential, that is to say a wide difference between the temperature at which it will snap to its hot condition and the much lower temperature at which it will reset to its cold condition
  • the function of the bimetallic actuator is to switch off the heating element at a sensed high temperature and then hold it off even as the heating element cools to ensure that the element is not
  • An X4 control modified for use with a cafetiere in accordance with the present invention might therefore comp ⁇ se a first, low temperature bimetallic actuator comp ⁇ smg a simple dished bimetallic blade formed to fit the mounting in the X4 control that conventionally mounts an X cut-out type bimetallic blade
  • This low temperature bimetal might be operable from its cold to its hot condition at a temperature of, say, 90°C and might be such as to reset automatically to its cold condition when its temperature cools to, say, 80°C
  • the control might also comp ⁇ se a second, high temperature bimetallic actuator of the X cut-out type arranged to operate from its low temperature condition to its high temperature condition at, say, 180°C or thereabouts and to reset automatically to its low temperature condition at some temperature above 100°C
  • Such a modified control might advantageously be adapted for use with a thick film heating element having high power and low power sections having a common connecting point by provision of an additional contact on the control for contacting the thick film heating element
  • the moving contact of the respect ⁇ e set of switch contacts is connected either to the mam element section remote connection (parallel) or directly to the common connecting point of the two heater tracks (se ⁇ es)
  • Figures 1A to 1 G show an exemplary embodiment of control cum 360° power mlet connector according to the present invention, this embodiment being a modification of our currently made and sold X4a control
  • Figure 1A being a plan view of the underside of the embodiment (namely the side of the control which faces a heating element in use)
  • Figure IB being a plan view of the opposite (upper) side of the control
  • Figures 1C being side elevation views from the directions C, D and E shown m Figure 1A.
  • Figure IF and 1G being isomet ⁇ c views of the under and upper sides respectively of the control,
  • Figures 2 A and 2B show how the control of Figures 1A to 1G might be used with a heating element having main and keep warm element sections,
  • Figure 2A showing a circuit diagram wherein the two heating element sections are elect ⁇ cally in parallel
  • Figure 2B showing a circuit diagram
  • Figure 3 shows the track layout of a thick film heating element for use
  • Figure 4 shows the track layout of a thick film heating element for use
  • the X4a control comp ⁇ ses a moulded plastics mate ⁇ al body 1 which
  • each of the bimetallic switches 2 and 3 m the X4a control comp ⁇ ses a bimetallic actuator which is earned in a sp ⁇ ng metal earner and co-operates with a push rod to determine the status of a respective set of switch contacts A.s desc ⁇ bed m WO-A-99/54903 the sp ⁇ ng earners co-operate with the push rods to define respective overcentre mechanisms which require normal intervention after operation to reset the associated switches, but this feature is not required in the practice of the present invention and the earner spnngs are modified so that the push rods simply follow the bimetal movements
  • both of these bimetallic actuators are of a dished, snap-acting kind having an X-shaped central cut-out
  • the bimetallic actuators are of this kind, namely the bimetallic actuator 5 of the switch assembly 3, and the other bimetallic actuator 6 is a simple dished, snap-acting bimetal shaped similarly to the bimetallic actuator 5 so as to fit into and be earned by the sp ⁇ ng earner of the first switch 2 but having no
  • the X cut-out bimetal 5 is selected to have a high operating temperature of the order of 180°C or 200°C, namely the temperature at which it snaps from its cold condition to its hot condition so as to open its associated switch contacts, and a large differential so that it cannot reset automatically until its temperature falls to somewhere of the order of 1 10°C to 120°C
  • the plain, dished bimetal 6 is selected to have a much lower operating temperature of about 90°C and a relatively small differential so that it will reset automatically at about 80°C
  • the X4 control as desc ⁇ bed in WO-A-99/54903 with reference to Figures 2A to 2D thereof has two spnng contacts for making electncal contact with respective terminal pads of a thick film heating element and these are designated 1 1 and 12 m Figures 1A to IG of the accompanying drawings
  • the X4a control has a third sp ⁇ ng contact for making elect ⁇ cal contact with a third terminal pad of a thick film heating element and, like the X4a control, the control of Figures 1A to IG has this third sp ⁇ ng contact, designated 13 in the accompanying drawings
  • the sp ⁇ ng contact 13 provides access to the fixed contact of the set of switch contacts actuated by bimetal 6 and to one of the supply terminals of the connector part of the control
  • This contact 13 is provided to connect to the remote end of a low power heating track of a thick film heating element
  • the moving contact of this set is connected to the mam element remote connection (parallel) or directly to the common connecting point of the two heater tracks (se ⁇ es) as is shown m Figures 2A and 2B respectively
  • a thick film heating element has a mam heater track 20 dehve ⁇ ng 1000 Watts of power, for example, and a keep warm track 21 de ve ⁇ ng just 50 Watts for example
  • the low temperature bimetallic actuator of the control desc ⁇ bed with reference to Figures 1A to IG determines the operating condition of a set of switch contacts 22 and the high temperature bimetallic actuator of the control determines the operating condition of a set of switch contacts 23
  • a neon indicator lamp 24 is connected across the low temperature bimetallic switch contacts 22
  • the spnng contact 11 of the control of Figures 1 A to IG will, m operation with the heating element configurations shown in Figures 2A and 2B, be connected to the heating element terminal pad designated 1 1 in Figures 2 A and 2B.
  • FIG. 3 shows an exemplary track layout for a thick film heating element for a cafetiere wherein the mam heating element track 20 is shown in dark and the keep warm heating element track 21 is shown m light, the two track sections 20 and 21 being m a parallel configuration as shown in Figure 2A and the termination pads for connection with the sp ⁇ ng terminals 1 1 , 12 and 13 being indicated
  • Figure 4 shows an alternative track layout for a coffee percolator where the two track sections are m se ⁇ es as in
  • the cafetiere then the bimetal 5 will switch off m the normal way to protect it
  • the bimetal 6 will not sense the temperature rise fast enough since it is located away from the heater track in the region designated 30 in Figure 3 so that it can sense the water temperature. In fact it may be located on a specially provided clear area of the metal substrate of the thick film heating element which is not covered by dielectric, in order to give a more accurate measure of the water temperature. However, because it is set at a low temperature, it will operate on overshoot of the high temperature bimetal 5, which operates at around 180°C. As the whole heating element cools, the high temperature bimetal 5 will reset first, typically above 100°C.
  • the output of the low power element 21 is sufficient to keep the heating element above the remake temperature of the low temperature bimetal 6, around 80°C, and is sufficiently low powered not to cause any damage.
  • an electrically maintained, non-self-resetting cut-out is provided, which removes the need for any other manual reset components for the high temperature bimetal 5, thus reducing cost.
  • the control can be reset by either filling the vessel with cold water, or removing it from its base, thus disconnecting the power supply. Either action will reset the low temperature bimetal 6, allowing the brew cycle to be repeated.
  • the invention thus provides a manually resettable dry boil protection system, without the need to provide additional mechanical components to form a latching mechanism.
  • the embodiments desc ⁇ bed are exemplary only and that modifications and va ⁇ ations thereto can be made without departure from the spmt and scope of the invention
  • the low temperature bimetal does not have to be just a plain, dished bimetal, rather it could be any kind of bimetal, even a bimetal with an X-shaped cut-out, having the required characte ⁇ stics
  • the high temperature bimetal is similarly susceptible to modification and vanation

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Control Of Temperature (AREA)
  • Apparatus For Making Beverages (AREA)

Abstract

L'invention concerne une commande permettant d'automatiser le fonctionnement d'une cafetière chauffée électriquement ou similaire et de la protéger de dommages que pourrait provoquer une surchauffe de son élément chauffant. La commande comprend deux bimétaux séparés (5, 6) qui rentrent en contact thermiquement avec la face inférieure d'un élément chauffant à film épais du dispositif, l'un se trouvant dans une zone exempte de voies chauffantes et l'autre dans une zone traversée par des voies chauffantes. Le 'premier' bimétal (6) a une température d'arrêt comprise entre environ 90 °C et 100 °C et un petit différentiel d'environ 10 °C, l''autre' bimétal (5) a une température d'arrêt comprise entre environ 180 °C et 200 °C et un grand différentiel compris entre environ 60 °C et 80 °C. L'élément chauffant à film épais présente des voies chauffantes principales (20) et auxiliaires (21). Lors d'un fonctionnement normal, le 'premier' bimétal à faible température régule le fonctionnement du dispositif en mode 'garder chaud' par le biais de la connexion appropriée de la voie auxiliaire, lorsque l'eau dans le dispositif a été chauffée par la voie principale entre 90 °C et 100 °C. Puis le 'premier' bimétal fonctionne comme un thermostat pour garder l'eau chaude. En d'allumage à vide, la température de l'élément chauffant augmente trop rapidement pour faire fonctionner le bimétal à faible température, mais elle est rattrapée par le bimétal à température élevée. Tandis que le dispositif refroidit lentement, le bimétal à faible température répond éventuellement et permute le dispositif en mode 'garder chaud'.
PCT/GB2001/000817 2000-03-02 2001-02-23 Commande de recipients chauffant pour liquides WO2001064084A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001233972A AU2001233972A1 (en) 2000-03-02 2001-02-23 Control for a liquid heating vessels

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0005081.5 2000-03-02
GB0005081A GB2359978B (en) 2000-03-02 2000-03-02 Liquid heating appliance and "keep warm" control

Publications (1)

Publication Number Publication Date
WO2001064084A1 true WO2001064084A1 (fr) 2001-09-07

Family

ID=9886850

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/000817 WO2001064084A1 (fr) 2000-03-02 2001-02-23 Commande de recipients chauffant pour liquides

Country Status (3)

Country Link
AU (1) AU2001233972A1 (fr)
GB (1) GB2359978B (fr)
WO (1) WO2001064084A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1233649A1 (fr) * 2001-02-19 2002-08-21 Strix Limited Commande thermosensible pour un réceptacle chauffant pour liquides
GB2379851B (en) * 2001-09-11 2005-09-28 Otter Controls Ltd Underfloor heating elements and element protector control assemblies for underfloor heating elements
JP2015037494A (ja) * 2013-08-19 2015-02-26 タイガー魔法瓶株式会社 電気湯沸器
US10816216B2 (en) 2017-12-12 2020-10-27 Electrolux Home Products, Inc. Method and apparatus for preventing cooktop fires

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2397011A (en) * 2003-01-07 2004-07-14 Otter Controls Ltd A liquid heating device having a keep-warm facility
GB2409341A (en) * 2003-12-16 2005-06-22 Otter Controls Ltd Improvements relating to thermal control units
GB2439657B (en) * 2003-12-16 2008-09-17 Otter Controls Ltd improvements relating to thermal controls
DE102005018597B3 (de) 2005-04-21 2006-11-09 Bleckmann Gmbh & Co. Kg Heizsystem mit Temperatursicherungseinrichtungen und Wärmeübertragungselement hierfür
GB0525790D0 (en) * 2005-12-19 2006-01-25 Strix Ltd Liquid heating vessels and controls and components therefor
GB2497978A (en) 2011-12-23 2013-07-03 Otter Controls Ltd Liquid heating vessel and control

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1274552A (en) * 1969-04-18 1972-05-17 Otter Controls Ltd Improvements relating to liquid heating containers
GB2149217A (en) * 1983-10-31 1985-06-05 Strix Ltd Thermally-sensitive controls
GB2285716A (en) 1992-09-02 1995-07-19 Otter Controls Ltd Charging unit for cordless appliances
WO1995034187A1 (fr) 1994-06-09 1995-12-14 Strix Limited Recipients pour chauffer un liquide
WO1997004694A2 (fr) * 1995-07-31 1997-02-13 Strix Limited Recipients pour le chauffage de liquides
GB2308743A (en) * 1994-06-09 1997-07-02 Strix Ltd Liquid heating vessels
WO1999002080A1 (fr) * 1997-07-11 1999-01-21 Strix Limited Receptacles chauffant des liquides et dispositifs de reglage adaptes
WO1999054903A2 (fr) 1998-04-21 1999-10-28 Otter Controls Limited Ameliorations relatives a la commande d'elements chauffants electriques
GB2343352A (en) 1998-10-06 2000-05-03 Otter Controls Ltd Two stage thick film element for a percolator
WO2000030514A1 (fr) * 1998-11-26 2000-06-02 Strix Limited Appareil electrique de fabrication de boissons

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206734B (en) * 1987-06-27 1991-04-24 Haden D H Ltd Thermally responsive electrical device
GB2337194B (en) * 1998-05-13 2002-08-07 Otter Controls Ltd Improvements relating to electrically heated water boiling vessels
GB2339335A (en) * 1998-07-09 2000-01-19 Strix Ltd Controls for electric water boiling vessels

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1274552A (en) * 1969-04-18 1972-05-17 Otter Controls Ltd Improvements relating to liquid heating containers
GB2149217A (en) * 1983-10-31 1985-06-05 Strix Ltd Thermally-sensitive controls
GB2285716A (en) 1992-09-02 1995-07-19 Otter Controls Ltd Charging unit for cordless appliances
WO1995034187A1 (fr) 1994-06-09 1995-12-14 Strix Limited Recipients pour chauffer un liquide
GB2308743A (en) * 1994-06-09 1997-07-02 Strix Ltd Liquid heating vessels
WO1997004694A2 (fr) * 1995-07-31 1997-02-13 Strix Limited Recipients pour le chauffage de liquides
WO1999002080A1 (fr) * 1997-07-11 1999-01-21 Strix Limited Receptacles chauffant des liquides et dispositifs de reglage adaptes
WO1999054903A2 (fr) 1998-04-21 1999-10-28 Otter Controls Limited Ameliorations relatives a la commande d'elements chauffants electriques
GB2343352A (en) 1998-10-06 2000-05-03 Otter Controls Ltd Two stage thick film element for a percolator
WO2000030514A1 (fr) * 1998-11-26 2000-06-02 Strix Limited Appareil electrique de fabrication de boissons

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1233649A1 (fr) * 2001-02-19 2002-08-21 Strix Limited Commande thermosensible pour un réceptacle chauffant pour liquides
EP1565037A1 (fr) * 2001-02-19 2005-08-17 Strix Limited Commande thermosensible pour un réceptacle chauffant pour liquides
GB2379851B (en) * 2001-09-11 2005-09-28 Otter Controls Ltd Underfloor heating elements and element protector control assemblies for underfloor heating elements
JP2015037494A (ja) * 2013-08-19 2015-02-26 タイガー魔法瓶株式会社 電気湯沸器
US10816216B2 (en) 2017-12-12 2020-10-27 Electrolux Home Products, Inc. Method and apparatus for preventing cooktop fires

Also Published As

Publication number Publication date
GB2359978A (en) 2001-09-12
AU2001233972A1 (en) 2001-09-12
GB2359978B (en) 2003-12-24
GB0005081D0 (en) 2000-04-26

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