EP0275635A1 - Dispositifs de chauffage par immersion - Google Patents

Dispositifs de chauffage par immersion Download PDF

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Publication number
EP0275635A1
EP0275635A1 EP87310158A EP87310158A EP0275635A1 EP 0275635 A1 EP0275635 A1 EP 0275635A1 EP 87310158 A EP87310158 A EP 87310158A EP 87310158 A EP87310158 A EP 87310158A EP 0275635 A1 EP0275635 A1 EP 0275635A1
Authority
EP
European Patent Office
Prior art keywords
sensor
immersion heater
housing
probe
heater
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.)
Withdrawn
Application number
EP87310158A
Other languages
German (de)
English (en)
Inventor
Alan Wilfred Welsh
Trevor William Cheetham
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.)
Redring Electric Ltd
Original Assignee
Redring Electric 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
Priority claimed from GB868629920A external-priority patent/GB8629920D0/en
Priority claimed from GB878705051A external-priority patent/GB8705051D0/en
Application filed by Redring Electric Ltd filed Critical Redring Electric Ltd
Publication of EP0275635A1 publication Critical patent/EP0275635A1/fr
Withdrawn legal-status Critical Current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
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • H05B3/82—Fixedly-mounted immersion heaters

Definitions

  • This invention relates to immersion heaters, more especially for washing machines, of the kind incorporating a sheathed wire electric heating element supported by a mounting head comprising a pair of relatively rigid plates having a sandwiched between them a block of resilient material, such that on insertion of the element through a co-operating opening in the wall of a vessel designed to contain a liquid to be heated, the block of resilient material can be compressed between the plates to seal against the wall of the vessel around the opening.
  • an immersion heater of the kind referred to comprises a metal housing brazed to the heating element, and of dimensions such that it can be inserted through said co-operating opening in the vessel wall, so as to lie within the said vessel when the immersion heater is fitted thereto and, removably sealed within said housing, a disc type thermal sensor connected in series with the heating element and operative to cut off the supply of current thereto on reaching a predetermined temperature.
  • thermal sensors can be made in relatively small dimensions, for example of the order of 13 mm in diameter, and besides being highly efficient are considerably less expensive than the forms of thermal protective devices used on washing machine immersion heaters at the present time.
  • the thermal sensor may be in the form of a manually resettable unit.
  • the heater in such a case will include means for enabling the sensor to be manually reset to the closed condition, following the operation thereof, when the temperature of the heating element has fallen below said predetermined temperature.
  • the means for resetting the sensor is conveniently in the form of a plunger, this preferably being spring biased away from the sensor so that it does not interfere with the opening operation of the sensor.
  • the thermal sensor can be single a operation unit or an automatically resettable unit.
  • the sensor is carried by a probe which is insertable within the housing and carries a resilient seal, for example an O-ring seal, which bears against the inner surface of the housing to form a fluid-tight enclosure for the sensor, the probe having a tubular stem projecting therefrom and being sealed in a fluid-tight manner through the head of the immersion heater for carrying leads from the sensor to the exterior of the vessel.
  • a resilient seal for example an O-ring seal
  • the immersion heater illustrated in Figures 1 and 2 comprises a sheathed wire electric heating element 1 having two limbs supported by a mounting head 2 from which they extend parallel to each other for approximately half their length, the looped end 3 of the element being bent back towards the mounting head 2 to terminate a short distance from it as shown in Figure 1.
  • a short hollow cylindrical housing 4 of zinc coated stainless steel To this looped end 3 there is brazed the closed end of a short hollow cylindrical housing 4 of zinc coated stainless steel, the open end of which is directed towards the mounting head.
  • a hollow tubular probe 5 ( Figure 2), carrying a disc type thermal sensor 6 at its end, is fitted into the housing 4 so that the sensor is closely adjacent the inner surface of its closed end, leads 7 to the sensor passing outwards through the hollow stem 15 of the probe, which extends through, and is supported by, the mounting head 2.
  • An O-ring 18 fits within a groove in the external surface of the probe 5 and bears against the inner surface of the housing 4 when the probe is fitted therein, so as to form a liquid-tight enclosure for the thermal sensor 6 and the connections thereto.
  • the mounting head 2 itself is of known construction comprising an outer elongate plate 8 of zinc coated mild steel with a peripheral flange 9 within is seated a block 10 of rubber, and an inner elongate plate 11 of zinc coated stainless steel, also having a peripheral flange 12, seated against the opposite side of the block, which is thereby sandwiched between the plates 8, 11.
  • the inner plate 11 has a stud 13 welded to the centre of its base and extending through openings in both the block 10 and plate 8.
  • the two ends 14 of the heating element 1 extend through openings in the inner plate 11 as well as in the block 10 and the plate 8, as does the stem 15 of the probe.
  • the immersion heater is arranged to be fitted into a corresponding opening in the wall of the outer drum of a washing machine, the dimensions of the opening being such that the main part of the block 10 is a close fit within the opening, a flange 16 around the end of the block adjacent the outer plate bearing against the outer surface of the wall around the opening.
  • a nut 17 is then tightened on to the stud so as to compress the rubber block 10 between the two plates 8, 11 and urges its sides into engagement with the edge of the opening to form a water-tight seal, the block also being compressed onto the ends 14 of the heating element and on to the stem 15 of the probe.
  • the cross-sectional dimensions of the inner plate 11 are such that the plate can pass through the opening in the wall of the washing machine drum, and the external diameter of the thermal sensor housing 4, for example of the order of 18 mm, is such that the housing can also pass through the openings, when fitting the immersion heater to the drum.
  • the thermal sensor 6 is connected in series with the heating element 1, and incorporates a switch operable to cut off the current to the heater when the heater temperature rises to, say, 110°C ⁇ 3.5°C.
  • thermal sensor has the advantage of cheapness and reliability, and not only serves to control the water temperature in the washing machine but, in addition, provides an efficient protection in the event of an excessive temperature rise, for example in the event of a 'boil-dry' situation; a separate safety device for such a purpose, which is commonly attached to washing machine drums, can therefore be dispensed with, resulting in an appreciable cost saving.
  • a separate safety device for such a purpose which is commonly attached to washing machine drums, can therefore be dispensed with, resulting in an appreciable cost saving.
  • owing to its close association with the heater it functions more quickly and efficiently in response to an excessive temperature rise of the heater, in a 'boil-dry' situation, than the currently used drum-mounted thermally operated devices referred to above.
  • the heater shown in Figures 3 and 4 is similar to that shown in Figures 1 and 2, with the same parts denoted by the same reference numerals, but in this case, it incorporates a manually resettable sensor incorporating a switch operable to cut off the current to the heater at a given temperature.
  • the sensor is provided in known manner with a depressable button 19 ( Figure 4) projecting from its rear surface.
  • a plunger 21 extends through the hollow probe 5, with its inner end adjacent the button 19, and its outer end projecting from the end of the probe stem 15.
  • the plunger is fitted with a knob 22 at its outer end and is held out of contact with the sensor button by a spring 23 acting between the knob 22 and the end of the stem 15.
  • the plunger 21 is shaped as shown in Figure 5 to accommodate the leads 7, and is tapered towards its outer end to prevent complete withdrawal from the probe stem 15. Other means of achieving this can, however, be employed if desired.
  • the ends of the spring 23 may be secured to the probe stem 15 and to the knob 22.
  • the senor used may be automatically resettable, incorporating a switch operable to cut off the current to the element when the water temperature rises to 90°C and to close automatically when the temperature falls to, say, 60°C.
  • a single operation sensor could be employed to break the circuit through the heating element.
  • a sensor of this type would cut off the current when the heater temperature rises to 120°C and closes when the temperature falls to around - 10°C.

Landscapes

  • Resistance Heating (AREA)
EP87310158A 1986-12-15 1987-11-18 Dispositifs de chauffage par immersion Withdrawn EP0275635A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB868629920A GB8629920D0 (en) 1986-12-15 1986-12-15 Immersion heaters
GB8629920 1986-12-15
GB8705051 1987-03-04
GB878705051A GB8705051D0 (en) 1987-03-04 1987-03-04 Immersion heaters

Publications (1)

Publication Number Publication Date
EP0275635A1 true EP0275635A1 (fr) 1988-07-27

Family

ID=26291698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87310158A Withdrawn EP0275635A1 (fr) 1986-12-15 1987-11-18 Dispositifs de chauffage par immersion

Country Status (1)

Country Link
EP (1) EP0275635A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0551914A2 (fr) * 1992-01-15 1993-07-21 Elpag Ag Chur Dispositif pour mettre en place un dispositif de chauffage dans une ouverture d'une paroi d'un réservoir
EP0624998A1 (fr) * 1993-05-11 1994-11-17 CANDY S.p.A. Dispositif de sécurité pour éléments de chauffage dans les appareils domestiques où la température est régulée
EP1662843A1 (fr) * 2004-11-30 2006-05-31 Bleckmann GmbH & Co. KG Elément de serrage vulcanisé
DE102005007935A1 (de) * 2005-02-15 2006-08-24 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung für ein Elektrogerät
WO2008096915A1 (fr) 2007-02-06 2008-08-14 Lg Electronics Inc. Appareil de chauffage, et générateur de vapeur et appareil ménager utilisant un appareil de chauffage et un générateur de vapeur
WO2010035080A1 (fr) * 2008-09-23 2010-04-01 Indesit Company S.P.A. Machine à laver, en particulier un lave-linge, un lave-linge / sèche-linge ou un lave-vaisselle, équipée d’un dispositif de détection de la température de la resistance électrique utilisée pour réchauffer le liquide de lavage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2172495A (en) * 1939-09-12 Electric immersion heater
GB924829A (en) * 1959-05-14 1963-05-01 Gen Electric Co Ltd Improvements in or relating to electric immersion heaters
DE2552625A1 (de) * 1975-11-24 1977-06-02 Elpag Ag Chur Vorrichtung zur verhinderung einer ueberhitzung von elektrisch beheizten geraeten
GB2142809A (en) * 1983-06-08 1985-01-23 Redring Electric Ltd Immersion heater
EP0157277B1 (fr) * 1984-03-22 1989-03-01 EMIDE-METALLINDUSTRIE Gebr. Streicher Dispositif pour chauffage des liquides

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2172495A (en) * 1939-09-12 Electric immersion heater
GB924829A (en) * 1959-05-14 1963-05-01 Gen Electric Co Ltd Improvements in or relating to electric immersion heaters
DE2552625A1 (de) * 1975-11-24 1977-06-02 Elpag Ag Chur Vorrichtung zur verhinderung einer ueberhitzung von elektrisch beheizten geraeten
GB2142809A (en) * 1983-06-08 1985-01-23 Redring Electric Ltd Immersion heater
EP0157277B1 (fr) * 1984-03-22 1989-03-01 EMIDE-METALLINDUSTRIE Gebr. Streicher Dispositif pour chauffage des liquides

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0551914A2 (fr) * 1992-01-15 1993-07-21 Elpag Ag Chur Dispositif pour mettre en place un dispositif de chauffage dans une ouverture d'une paroi d'un réservoir
EP0551914A3 (fr) * 1992-01-15 1993-08-04 Elpag Ag Chur Dispositif pour mettre en place un dispositif de chauffage dans une ouverture d'une paroi d'un réservoir
EP0624998A1 (fr) * 1993-05-11 1994-11-17 CANDY S.p.A. Dispositif de sécurité pour éléments de chauffage dans les appareils domestiques où la température est régulée
EP1662843A1 (fr) * 2004-11-30 2006-05-31 Bleckmann GmbH & Co. KG Elément de serrage vulcanisé
DE102005007935A1 (de) * 2005-02-15 2006-08-24 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung für ein Elektrogerät
EP2118357A1 (fr) * 2007-02-06 2009-11-18 LG Electronics Inc. Appareil de chauffage, et générateur de vapeur et appareil ménager utilisant un appareil de chauffage et un générateur de vapeur
WO2008096915A1 (fr) 2007-02-06 2008-08-14 Lg Electronics Inc. Appareil de chauffage, et générateur de vapeur et appareil ménager utilisant un appareil de chauffage et un générateur de vapeur
EP2118357A4 (fr) * 2007-02-06 2011-03-16 Lg Electronics Inc Appareil de chauffage, et générateur de vapeur et appareil ménager utilisant un appareil de chauffage et un générateur de vapeur
US8351769B2 (en) 2007-02-06 2013-01-08 Lg Electronics Inc. Heating apparatus, and steam generator and home appliance using the same
WO2010035080A1 (fr) * 2008-09-23 2010-04-01 Indesit Company S.P.A. Machine à laver, en particulier un lave-linge, un lave-linge / sèche-linge ou un lave-vaisselle, équipée d’un dispositif de détection de la température de la resistance électrique utilisée pour réchauffer le liquide de lavage
EP2543762A3 (fr) * 2008-09-23 2014-04-16 Indesit Company S.p.A. Machine a laver, en particulier pour le linge ou machine lavante/séchante ou lave vaisselle équipée d'un dispositif pour mesurer la température de la résistance électrique chauffante utilisée pour préchauffer le liquide de lavage
US8882346B2 (en) 2008-09-23 2014-11-11 Indesit Company S.P.A. Washing machine, in particular a laundry machine or washing/drying machine or a dishwasher, equipped with a device for detecting the temperature of the electric resistance used for warming up the wash liquid
EP3133199A1 (fr) * 2008-09-23 2017-02-22 Whirlpool EMEA S.p.A Procédé d'élimination de dépôts calcaires dans une résistance électrique

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Effective date: 19890130

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Inventor name: CHEETHAM, TREVOR WILLIAM

Inventor name: WELSH, ALAN WILFRED