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EP2123119B1 - Heating element - Google Patents

Heating element Download PDF

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Publication number
EP2123119B1
EP2123119B1 EP07857616.2A EP07857616A EP2123119B1 EP 2123119 B1 EP2123119 B1 EP 2123119B1 EP 07857616 A EP07857616 A EP 07857616A EP 2123119 B1 EP2123119 B1 EP 2123119B1
Authority
EP
European Patent Office
Prior art keywords
heating element
connector
end part
cylindrical end
thermal fuse
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.)
Active
Application number
EP07857616.2A
Other languages
German (de)
French (fr)
Other versions
EP2123119A1 (en
Inventor
Duilio Capraro
Andrea Virzi
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.)
IRCA SpA Industria Resistenze Corazzate e Affini
Original Assignee
IRCA SpA Industria Resistenze Corazzate e Affini
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 IRCA SpA Industria Resistenze Corazzate e Affini filed Critical IRCA SpA Industria Resistenze Corazzate e Affini
Publication of EP2123119A1 publication Critical patent/EP2123119A1/en
Application granted granted Critical
Publication of EP2123119B1 publication Critical patent/EP2123119B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4285—Water-heater arrangements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/04—Heating arrangements
    • 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
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material

Definitions

  • the present invention relates to an electrical heating element with fuse, specifically to a heating element used for heating water in household appliances.
  • Heating elements or simply heaters, incorporating electrical resistors inserted within a casing, generally immersed, are used in household appliances, e.g. dishwashers or washing machines.
  • heating elements of this kind are overheating.
  • the overheating of the heating element occurs, for example, due to either excessive operating time of the element without water or operation with the surface of the casing coated with lime scale after a period in which the heater was operated in contact with particularly hard water, without contemplating the use of other devices. It is well known that the presence of lime scale on heating resistors causes an overheating of the element which could lead to the breakdown of the element.
  • a solution to avoid this kind of problem is to provide for a thermal fuse which has the function of cutting off the electrical current in case of sudden overheating of the heating element.
  • a heating element with cylindrical-shape immersed casing which contains the heating electrical resistor inside, is connected by means of a leg wire to a thermal fuse.
  • the latter is connected in turn by means of a pin which has the function of connecting to the power supply system.
  • a heating element of this type presents however some drawbacks such as an excessive resistance, due to the excessive total length of its components, which implies a slower heat transmission from the heating resistor to the thermal fuse and a lower operating sensitivity of the latter, due to the longer distance between fuse and heating resistor, with consequent larger dimensions and longer reaction times of the thermal fuse. Less reliability and a shorter working life thus derive.
  • Patent IT-B-1169499 discloses a heating element having the features of the preamble of claim 1.
  • DE-A-4243894 discloses a heating element where pin and fuse are interfaced by means of an intermediate connector piece.
  • the present invention thus intends to reach such objects by making a heating element in accordance with claim 1.
  • the total length is shortened by approximately 20%.
  • the heat is carried directly and more rapidly onto the fuse body through the specific connector.
  • the intervention times of the thermal fuse are thus shorter and its distance from the source of heat is smaller.
  • the heating element is mechanically more robust, with fewer component parts as the connection between the thermal fuse body and the base of the source of heat is direct.
  • the diameter of the heating element is also smaller, advantageously equal to approximately 6,5 mm.
  • Fig. 1 shows a heating element, globally indicated by numeral 1, which comprises a cylindrical-shape immersed casing 2, although different shapes are possible.
  • Element 1 is generally fixed to the wall of a container in which the liquid to be heated is contained, e.g. the tank of a washing machine.
  • a heating electrical resistor 3 e.g. spiral-shaped, but obviously it can be made in other shapes.
  • Resistor 3 is connected to a first pin 5, preferably formed by copper or iron.
  • an electrically insulating material 6 e.g. magnesium oxide, which surrounds first pin 5 to fix it in a centred position integral with casing 2 itself.
  • material 6 performs the further function of transferring the heat outwards.
  • pin 5 is connected to an electrically conducting metal connector 10, preferably but not necessarily formed by copper.
  • Connector 10 advantageously consists of a first cylindrical part 7, longitudinally cleft to provide the cylindrical part with an elasticity which allows to secure cylindrical pin 5.
  • Connector 10 further comprises a second cylindrical part 9, of larger diameter than that of first part 7.
  • This second part 10 is also longitudinally cleft to provide it with an elastic securing capacity on a thermal fuse 11.
  • the two cylindrical parts 7 and 9 of connector 10, thus provided with a certain radial elasticity, are joined by a third fitting part 8 having a solid surface obtained by rotating a right-angled trapezium about the side perpendicular to the bases, i.e. an essentially truncated-cone shape.
  • this third part 8 has a half truncated-cone shape, corresponding to a 180° rotation of said right-angled trapezium.
  • connector 10 may consists of a foil which in its open and flat shape comprises two flat rectangular surfaces joined by a further surface.
  • this further surface is rectangular and the geometric configuration shown in Figures 2a and 2b is obtained by folding said foil.
  • this further surface is trapezoidal and a third, essentially truncated-cone-shaped fitting part 8 is obtained by folding the foil.
  • a material such as for example a resin, which insulates connector 10 and keeps it fixed with respect to the structure of heating element, to avoid detachment, vibrations, etc., may be advantageously incorporated around cylindrical part 7 of connector 10.
  • Thermal fuse 11 has a cylindrical shape and is in turn connected to a second pin 12 which connects to the power supply system, e.g. by means of electrical wires (not shown).
  • an insulating coating of plastic material or other suitable material e.g. in the shape of a bush 13, over all or part of the surface.
  • An insulating socket 15 closing the casing is further provided.
  • the space inside casing 2 comprised between pin 12, bushing 13 and socket 15 may be filled with sealing resin.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Resistance Heating (AREA)

Description

    Field of the invention
  • The present invention relates to an electrical heating element with fuse, specifically to a heating element used for heating water in household appliances.
    • State of the art
  • Heating elements, or simply heaters, incorporating electrical resistors inserted within a casing, generally immersed, are used in household appliances, e.g. dishwashers or washing machines.
  • One of the problems of heating elements of this kind is overheating. The overheating of the heating element occurs, for example, due to either excessive operating time of the element without water or operation with the surface of the casing coated with lime scale after a period in which the heater was operated in contact with particularly hard water, without contemplating the use of other devices. It is well known that the presence of lime scale on heating resistors causes an overheating of the element which could lead to the breakdown of the element.
  • Thus, a solution to avoid this kind of problem is to provide for a thermal fuse which has the function of cutting off the electrical current in case of sudden overheating of the heating element.
  • It is known that a heating element with cylindrical-shape immersed casing, which contains the heating electrical resistor inside, is connected by means of a leg wire to a thermal fuse. The latter is connected in turn by means of a pin which has the function of connecting to the power supply system. These elements are arranged one after the other thus determining the length of the element.
  • A heating element of this type presents however some drawbacks such as an excessive resistance, due to the excessive total length of its components, which implies a slower heat transmission from the heating resistor to the thermal fuse and a lower operating sensitivity of the latter, due to the longer distance between fuse and heating resistor, with consequent larger dimensions and longer reaction times of the thermal fuse. Less reliability and a shorter working life thus derive.
  • Patent IT-B-1169499 discloses a heating element having the features of the preamble of claim 1.
  • DE-A-4243894 discloses a heating element where pin and fuse are interfaced by means of an intermediate connector piece.
  • It is thus felt the need to make a heating element which allows to overcome the aforesaid drawbacks.
    • Summary of the invention
  • It is the main object of the present invention to make a more compact, more reliable heating element whose working life is longer.
  • The present invention thus intends to reach such objects by making a heating element in accordance with claim 1.
  • By arranging the various parts forming the heating element according to the invention, the total length is shortened by approximately 20%. In virtue of this, the heat is carried directly and more rapidly onto the fuse body through the specific connector. The intervention times of the thermal fuse are thus shorter and its distance from the source of heat is smaller. In virtue of the specific shape of the connector, the heating element is mechanically more robust, with fewer component parts as the connection between the thermal fuse body and the base of the source of heat is direct. The diameter of the heating element is also smaller, advantageously equal to approximately 6,5 mm.
  • The dependent claims describe preferred embodiments of the invention.
    • Brief description of the drawings
  • Further features and advantages of the present invention will be more apparent in the light of the detailed description of a preferred, but not exclusive, embodiment of a heating element illustrated by way of non-limitative example, with the aid of the accompanying drawings, in which:
    • Figure 1 shows a heating element according to the invention;
    • Figures 2a and 2b show side views of a component of the heating element in Figure 1;
    • Figures 3a and 3b shows two embodiments of the component of Figures 2a and 2b before folding.
    Detailed description of a preferred embodiment of the invention
  • Fig. 1 shows a heating element, globally indicated by numeral 1, which comprises a cylindrical-shape immersed casing 2, although different shapes are possible. Element 1 is generally fixed to the wall of a container in which the liquid to be heated is contained, e.g. the tank of a washing machine.
  • Within casing 2, e.g. in the form of sheath or steel tube, there is arranged a heating electrical resistor 3, e.g. spiral-shaped, but obviously it can be made in other shapes. Resistor 3 is connected to a first pin 5, preferably formed by copper or iron.
  • There is provided within casing 2 an electrically insulating material 6, e.g. magnesium oxide, which surrounds first pin 5 to fix it in a centred position integral with casing 2 itself. In addition to the electrical insulation function, material 6 performs the further function of transferring the heat outwards.
  • At one of its ends, pin 5 is connected to an electrically conducting metal connector 10, preferably but not necessarily formed by copper.
  • Connector 10 advantageously consists of a first cylindrical part 7, longitudinally cleft to provide the cylindrical part with an elasticity which allows to secure cylindrical pin 5. Connector 10 further comprises a second cylindrical part 9, of larger diameter than that of first part 7. This second part 10 is also longitudinally cleft to provide it with an elastic securing capacity on a thermal fuse 11. The two cylindrical parts 7 and 9 of connector 10, thus provided with a certain radial elasticity, are joined by a third fitting part 8 having a solid surface obtained by rotating a right-angled trapezium about the side perpendicular to the bases, i.e. an essentially truncated-cone shape. In the preferred embodiment of connector 10 shown in figures 2a and 2b, this third part 8 has a half truncated-cone shape, corresponding to a 180° rotation of said right-angled trapezium.
  • As shown in figures 3a and 3b, connector 10 may consists of a foil which in its open and flat shape comprises two flat rectangular surfaces joined by a further surface.
  • In the example in Fig. 3a, this further surface is rectangular and the geometric configuration shown in Figures 2a and 2b is obtained by folding said foil.
  • In the example in Fig. 3b, this further surface is trapezoidal and a third, essentially truncated-cone-shaped fitting part 8 is obtained by folding the foil.
  • A material, such as for example a resin, which insulates connector 10 and keeps it fixed with respect to the structure of heating element, to avoid detachment, vibrations, etc., may be advantageously incorporated around cylindrical part 7 of connector 10.
  • Thermal fuse 11 has a cylindrical shape and is in turn connected to a second pin 12 which connects to the power supply system, e.g. by means of electrical wires (not shown).
  • Within the casing, there is provided an insulating coating of plastic material or other suitable material, e.g. in the shape of a bush 13, over all or part of the surface.
  • An insulating socket 15 closing the casing is further provided. The space inside casing 2 comprised between pin 12, bushing 13 and socket 15 may be filled with sealing resin.

Claims (4)

  1. A heating element (1) comprising an immersed casing (2) containing an electrical heating resistor (3) therein, a thermal fuse (11) and a power supply system connecting element (12), wherein the electrical heating resistor (3) and the thermal fuse (11) are connected by electrical conductor means, the electrical conductor means comprise a connector (10), having a first cylindrical end part (7) a second cylindrical end part (9) electrically connected to the thermal fuse (11), the diameter of said second part (9) being wider than that of the first part (7), the first cylindrical end part (7) and the second cylindrical end part (9) have a longitudinal cleft providing radial elasticity to the connector (10), to secure the thermal fuse (11) on one side, characterised in that there is provided a first pin (5) fixed at one end to the heating resistor (3) and being elastically held at the opposite end within the first cylindrical end part (7) of the connector (10) by means of radial elasticity; and
    a third tapered fitting part (8) between first and second cylindrical end part, having a solid surface uniform of a essentially truncated-cone shape obtained by rotating a right-angled trapezium about the side perpendicular to its bases.
  2. A heating element according to claim 1, wherein the connector (10) in its open and flat shape comprises two flat rectangular surfaces joined by a further rectangular or trapezoidal surface.
  3. A heating element according to any of the preceding claims, wherein the immersed casing (2) is cylindrical.
  4. A heating element according to any of the preceding claims, wherein said connection element (12) to the power supply system is a second pin.
EP07857616.2A 2006-12-15 2007-12-14 Heating element Active EP2123119B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000676A ITRM20060676A1 (en) 2006-12-15 2006-12-15 HEATING ELEMENT
PCT/EP2007/063982 WO2008071794A1 (en) 2006-12-15 2007-12-14 Heating element

Publications (2)

Publication Number Publication Date
EP2123119A1 EP2123119A1 (en) 2009-11-25
EP2123119B1 true EP2123119B1 (en) 2013-06-19

Family

ID=38288474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07857616.2A Active EP2123119B1 (en) 2006-12-15 2007-12-14 Heating element

Country Status (6)

Country Link
EP (1) EP2123119B1 (en)
CN (1) CN101637061A (en)
ES (1) ES2427996T3 (en)
HK (1) HK1138149A1 (en)
IT (1) ITRM20060676A1 (en)
WO (1) WO2008071794A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009005481B3 (en) * 2009-01-21 2010-04-08 Bleckmann Gmbh & Co. Kg Connecting element for heating coil for tubular heater and production method thereof
KR101617298B1 (en) * 2014-08-22 2016-05-02 엘지전자 주식회사 Dishwasher
JP6437865B2 (en) * 2015-03-26 2018-12-12 京セラ株式会社 heater
EP3109564B1 (en) * 2015-06-24 2019-08-07 Bleckmann GmbH & Co. KG Terminal device for a tubular heating device with integrated fuse
CN105934007B (en) * 2016-05-06 2019-03-19 武汉航空仪表有限责任公司 A kind of packaging method of sheathed heater
IT201800003914A1 (en) * 2018-03-26 2019-09-26 Irca Spa FLUID HEATING DEVICE FOR HOUSEHOLD APPLIANCES

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1169499B (en) * 1983-09-15 1987-05-27 I R C A Ind Resistenze Corazza SELF-PROTECTED ARMORED ELECTRIC HEATING ELEMENT
DE4243894A1 (en) * 1991-12-24 1993-07-15 Eltra Gmbh & Co Kg Leicht & Tr Tubular heater with a thermal cut=out - has temp. dependent circuit breaker in tube screwed onto heating coil terminal in heater jacket.
DE29800704U1 (en) * 1998-01-16 1999-05-20 Elpag Ag Chur, Chur Tubular heating element with fuses in both ends

Also Published As

Publication number Publication date
WO2008071794A1 (en) 2008-06-19
ITRM20060676A1 (en) 2008-06-16
ES2427996T3 (en) 2013-11-05
CN101637061A (en) 2010-01-27
HK1138149A1 (en) 2010-08-13
EP2123119A1 (en) 2009-11-25

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