WO1993016569A1 - Corps de chauffe par immersion - Google Patents

Corps de chauffe par immersion Download PDF

Info

Publication number
WO1993016569A1
WO1993016569A1 PCT/GB1993/000314 GB9300314W WO9316569A1 WO 1993016569 A1 WO1993016569 A1 WO 1993016569A1 GB 9300314 W GB9300314 W GB 9300314W WO 9316569 A1 WO9316569 A1 WO 9316569A1
Authority
WO
WIPO (PCT)
Prior art keywords
control
combination
actuator
overheat protector
opening
Prior art date
Application number
PCT/GB1993/000314
Other languages
English (en)
Inventor
John Crawshaw Taylor
Original Assignee
Strix 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 Strix Limited filed Critical Strix Limited
Publication of WO1993016569A1 publication Critical patent/WO1993016569A1/fr
Priority to GB9416470A priority Critical patent/GB2278987A/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
    • A47J27/21066—Details concerning the mounting thereof in or on the water boiling vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/002—Thermally-actuated switches combined with protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/04—Bases; Housings; Mountings
    • H01H37/043—Mountings on controlled apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • 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
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • H05B3/82—Fixedly-mounted immersion heaters

Definitions

  • This invention relates to electric immersion heaters.
  • electric immersion heaters which are used, for example, in kettles, hot water jugs and other water heating appliances comprise a metal sheathed element which is brazed to a metal element head which is mounted to overlie and is sealed with respect to an opening in a wall of a liguid containing chamber of an appliance.
  • the element is brazed to the head at both its end portions, where the element sheath extends through the head to project by a small amount into the dry side of the head.
  • the element is formed so that a so-called hot return portion, which is a portion intermediate the ends, is bent back against the ' head and brazed thereto.
  • a thermally-sensitive actuator of a control is commonly arranged in thermal contact with the side of the head opposite the hot return i.e. the dry side, so that should the element overheat, for example when the appliance is switched on dry or boils dry, the temperature rise in the hot return portion of the element is conducted through the head to the actuator which, at a predetermined temperature, operates the control to interrupt the power supply to the element and thus de-energises the element.
  • the control may also comprise a back-up protector which operates to disconnect the power in the event that the primary protector fails to operate.
  • a water boiling vessel may also be provided with a steam-sensitive control which operates to disconnect the power to the element when liguid in the vessel boils.
  • the assembly of such elements and controls to the vessel is time consuming, it being necessary first to position the back of the element head against the opening in the wall from inside the vessel, with suitable sealing means interposed therebetween, and then mounting the control to the back of the head from outside the vessel, and securing the two together to mount the heater and control in the vessel wall. At the same time electrical connections need to be established between the control and heater. The assembly must then be tested in situ.
  • the present invention seeks to provide an immersion heater which overcomes these problems.
  • a combined immersion heater and control unit for a liguid boiling vessel comprising a control unit adapted to be mounted in relation to a vessel wall in or adjacent an opening therein, and a heating element mounted to said unit and being of lesser radial extent than both the unit and the opening so as to be introducable into the vessel via said opening from the outside as the unit is mounted to the vessel, said control unit incorporating a primary overheat protector, a back-up overheat protector, and a vapour sensitive boiling control for said vessel.
  • the primary overheat protector comprises a thermally responsive actuator, for example a bimetallic element, preferably snap acting, mounted on a high thermal conductivity link attached at one end to and extending at least partially around a return portion of the element in good thermal contact therewith.
  • a thermally responsive actuator for example a bimetallic element, preferably snap acting
  • the control unit preferably comprises a plastics housing, through an opening in a front face of which the end portions, ie. the cold leads, of the element and the thermal link extend, with sealing means engaging not only between the housing and the opening but also between the housing and the link and the element end portions.
  • the movement of the actuator of the primary overheat protector may be used to trigger a pre-loaded spring mechanism which acts to open a set of contacts within the control.
  • the actuator acts on a preferably slidably mounted lever having a portion which engages a leaf spring mounting a movable contact, so as to move it away from a fixed contact, provided on, for example, a terminal pin of the control.
  • the spring force may conveniently be provided by an over-centre spring, for example a B-spring, mounted in the control housing and engaging the lever.
  • the lever may engage two movable contacts provided in the line and neutral sides of the supply to the element with the fixed contacts preferably being mounted to or forming part of the respective terminal pins.
  • the leaf springs mounting the movable contacts extend directly between the cold leads of the element and the terminal pins, and most preferably are mounted directly onto the cold leads of the element although they may be mounted on the terminal pins, if desired.
  • the vapour sensitive control preferably comprises a thermally-sensitive actuator, such as a bimetallic actuator mounted on or in the control unit housing.
  • a thermally-sensitive actuator such as a bimetallic actuator mounted on or in the control unit housing.
  • the actuator which may be snap-acting, is mounted externally on said housing for example on an upper part thereof so as to avoid vapour, which is conducted via a suitable steam passage of the vessel to the actuator for its operation, entering the housing.
  • the steam sensitive actuator causes opening of the same contacts as the primary overheat protector.
  • the slidable lever may extend out of the top of the control unit housing and engage the actuator.
  • the lever may also have a portion for engagement with an operating member which is coupled with or forms an on-off knob of the appliance.
  • the back-up protector comprises a thermal fuse which is in thermal contact with the element and which melts or thermally distorts when the element overheats.
  • the fuse may be resiliently biased into engagement with a portion of the thermal link, so that should the primary overheat protector fail, the temperature of the link will rise to the extent that the fuse member will deform and move under the resilient biasing force, the movement being used to cause opening of contacts in the power supply to the element, advantageously the same contacts as opened by the primary overheat protector.
  • the invention also provides an electric immersion heater comprising a metal sheathed heating element having cold leads extending from the respective ends thereof, resilient contact means mounted in contact with or to at least one of said cold leads and engaging with contact means provided on a fixed, vertically extending terminal pin of the heater, and a thermally responsive control, operable in the event of said element overheating, to move said resilient contact away from said terminal pin to interrupt the electrical supply to the element.
  • the thermally responsive control preferably comprises a primary overheat protector having preferred features as described hereabove.
  • a back-up protector and/or a vapour sensitive control may also be provided, acting to open the contacts in an appropriate operating condition.
  • Fig. 1 is a perspective view of a heater/control unit in accordance with the invention
  • Fig. 2 is a schematic rear view of the embodiment of Fig. 1, with the rear cover removed;
  • Fig. 3 is a schematic vertical section taken though Fig. 2.
  • a combined element and control unit comprises an element 1 extending from a control 2.
  • a thermally responsive, snap-acting bimetallic actuator 3 is mounted on the upper part of the control housing and acts upon a forwardly extending portion 4 of a lever arm extending into the control.
  • the cold tails 5 of the element 1 extend through the front face of the control housing 6 through apertures 7.
  • a link 8 of a material having a high thermal conductivity such as copper or copper clad with stainless steel extends around a return portion 9 of the element through a further opening 10 in the front face of the housing 6 a seal member 11 seals not only the openings 7 and 10 but also seals the opening 12 in the vessel wall as shown when the control unit is mounted to the vessel.
  • a seal member 11 seals not only the openings 7 and 10 but also seals the opening 12 in the vessel wall as shown when the control unit is mounted to the vessel.
  • a snap-acting, thermally responsive bimetallic actuator 13 of a type known in the art is mounted onto the end of the link member 8 by an end portion 14 of an earth pin 15.
  • leaf springs 16 are mounted at one end to the cold tails 5 of the element and at their other end mount removable contacts 17. These contacts cooperate with fixed contact surfaces 18 formed on line and neutral pins 19 of the control.
  • the leaf springs 16 are provided beyond the contact 17 with extension portions 20 which are arranged to lie over forwardly projecting lugs 21 of a slidably mounted member 22.
  • the member 22 has a forwardly projecting portion 23 which overlies the free end of the snap-acting bimetallic actuator 13.
  • the upper end of the member 22 has a forwardly extending projection 4 which overlies the steam activated bimetallic actuator 3, extending through a slot 24 in an upward extension of the housing 6.
  • the thermally responsive actuators 3,13 are of the well known type which reverse their curvature when they exceed a predetermined operation temperature. Such actuators are described for example in GB 657434.
  • Fig. 3 when the steam activated bimetallic actuator 3 is impinged upon by steam egressing from the vessel, via suitable conduit means provided in the vessel, it will change its curvature and so move the slide member 22 upwardly. This upward movement will cause the free ends 26 of the B spring 25 which engage the member 22 to pass through their neutral positions and so move the member 22 upwardly with a snap-action.
  • the lugs 21 on the member 22 will in that case engage with the free ends 20 of the leaf springs 16 to part the contacts 17,18 on both the line and neutral sides of the supply to the element.
  • the steam activated bimetallic actuator fail to operate and the temperature of the thermal link 8 rise to the point where the primary protector bimetallic actuator 13 operates it too will act upon the slide member 22 to cause its movement under the influence of the B spring 25.
  • a secondary back-up protector is provided in the form of a thermal fuse 30 which is resiliently biased by a coil spring 31 into contact with the thermal link 8.
  • the thermal fuse has a bifurcated portion 32 terminating in lugs 33 which extend under the free end portions 20 of the leaf springs 16.
  • the forwardly projecting lugs 21 of the slide member 22 and the rearwardly extending lugs 33 of the thermal fuse 30 do not overlap so that their operation is independent of one another.
  • the temperature of the thermal link 8 will continue to rise to the point where the upper part of the thermal fuse 30 will deform thermally under the force of the spring 31, causing the lugs 33 to move upwardly and engage the free end portions of the leaf springs 16, thereby opening the contacts 18,19. Should this happen, it will be clear that the contacts cannot be remade without replacing the thermal fuse member 30.
  • the upper end portion 40 of the slide 22 may be connected to a rod 41 which extends to an on-off knob of the appliance. It will be clear that once the slide member 22 operates, the spring mechanism 25 can be reset by .pressing downwardly on the rod 41 to recock the mechanism.
  • the portion 40 may act upon a member mounted pivotally on the control housing with a knob portion which in use extends from the appliance operation by a user.
  • the embodiment shown is a cordless appliance, the terminal pins 16,19 extending downwardly from the control for engagement with corresponding contact provided in a socket 50 in a base for the appliance. It will be appreciated that the invention may equally apply to corded appliances, in which case the terminal pin.'-. may be arranged to extend horizontally from the rear ⁇ - ⁇ ' the control.
  • t_it- housing is closed by a cover plate 35.
  • Apertures 60 are provided in the control housing and the cover plr, ' .- receiving mounting screws not shown which, in use, will mount the control and element as a unit to the wall of the appliance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Control Of Temperature (AREA)

Abstract

Un élément et une unité de contrôle combinés comprennent un élément (1) et une unité de contrôle (2) comportant une protection de surtempérature primaire, une protection d'appui de surtempérature et un contrôleur d'ébullition sensible à la vapeur. Les dimensions de l'élément et du contrôle sont telles que l'unité peut être montée dans l'ouverture d'une paroi d'une enceinte depuis l'extérieur. Un actuateur bimétallique (3) du contrôleur d'ébullition est monté au sommet du corps de contrôle (6) et il agit via un élément glissant (4) pour ouvrir les contacts à l'intérieur du contrôleur. Ces contacts sont aussi ouverts sous l'action des protections primaire et d'appui.
PCT/GB1993/000314 1992-02-14 1993-02-15 Corps de chauffe par immersion WO1993016569A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9416470A GB2278987A (en) 1992-02-14 1994-08-15 Immersion heaters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929203230A GB9203230D0 (en) 1992-02-14 1992-02-14 Immersion heaters
GB9203230.9 1992-02-14

Publications (1)

Publication Number Publication Date
WO1993016569A1 true WO1993016569A1 (fr) 1993-08-19

Family

ID=10710447

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/000314 WO1993016569A1 (fr) 1992-02-14 1993-02-15 Corps de chauffe par immersion

Country Status (4)

Country Link
AU (1) AU3507493A (fr)
GB (2) GB9203230D0 (fr)
WO (1) WO1993016569A1 (fr)
ZA (1) ZA93998B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686368A1 (fr) * 1994-06-08 1995-12-13 Seb S.A. Elément chauffant mobile pour appareil électrique de cuisson
WO2008141491A1 (fr) * 2007-05-21 2008-11-27 Ningbo Goodfriends Electric Appliance Co., Ltd Régulateur thermosensible et thermoplongeur électrique correspondant
GB2472631A (en) * 2009-08-13 2011-02-16 Otter Controls Ltd Immersed element cordless kettle
KR101437968B1 (ko) * 2007-09-03 2014-09-05 엘지전자 주식회사 의류처리장치용 히터 및 이를 구비한 의류처리장치
WO2023085907A1 (fr) * 2021-11-15 2023-05-19 한온시스템 주식회사 Dispositif de chauffage de fluide

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB892685A (en) * 1959-04-16 1962-03-28 William Morris Russell Improvements in electric kettles
GB2042269A (en) * 1979-01-15 1980-09-17 Taylor J C Thermally-sensitive electrical controls for electric heaters
GB2170956A (en) * 1985-01-29 1986-08-13 Strix Ltd Thermally-sensitive controls for electrical immersion heaters
WO1990009672A1 (fr) * 1989-02-14 1990-08-23 Strix Limited Dispositif de chauffage destine a etre immerge
EP0524096A1 (fr) * 1991-07-19 1993-01-20 Seb S.A. Appareil de chauffage d'eau, notamment bouilloire, comportant un dispositif de régulation et de rupture d'alimentation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE852005C (de) * 1942-06-02 1952-10-09 Mahr Carl Fuehlhebelmessgeraet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB892685A (en) * 1959-04-16 1962-03-28 William Morris Russell Improvements in electric kettles
GB2042269A (en) * 1979-01-15 1980-09-17 Taylor J C Thermally-sensitive electrical controls for electric heaters
GB2170956A (en) * 1985-01-29 1986-08-13 Strix Ltd Thermally-sensitive controls for electrical immersion heaters
WO1990009672A1 (fr) * 1989-02-14 1990-08-23 Strix Limited Dispositif de chauffage destine a etre immerge
EP0524096A1 (fr) * 1991-07-19 1993-01-20 Seb S.A. Appareil de chauffage d'eau, notamment bouilloire, comportant un dispositif de régulation et de rupture d'alimentation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686368A1 (fr) * 1994-06-08 1995-12-13 Seb S.A. Elément chauffant mobile pour appareil électrique de cuisson
FR2720917A1 (fr) * 1994-06-08 1995-12-15 Seb Sa Elément chauffant mobile pour appareil électrique de cuisson.
WO2008141491A1 (fr) * 2007-05-21 2008-11-27 Ningbo Goodfriends Electric Appliance Co., Ltd Régulateur thermosensible et thermoplongeur électrique correspondant
KR101437968B1 (ko) * 2007-09-03 2014-09-05 엘지전자 주식회사 의류처리장치용 히터 및 이를 구비한 의류처리장치
GB2472631A (en) * 2009-08-13 2011-02-16 Otter Controls Ltd Immersed element cordless kettle
GB2472631B (en) * 2009-08-13 2014-10-08 Otter Controls Ltd Electrical appliances
WO2023085907A1 (fr) * 2021-11-15 2023-05-19 한온시스템 주식회사 Dispositif de chauffage de fluide

Also Published As

Publication number Publication date
GB2278987A (en) 1994-12-14
GB9416470D0 (en) 1994-10-05
ZA93998B (en) 1994-03-22
GB9203230D0 (en) 1992-04-01
AU3507493A (en) 1993-09-03

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