EP0287772B1 - Heating element for household electrical appliances - Google Patents

Heating element for household electrical appliances Download PDF

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Publication number
EP0287772B1
EP0287772B1 EP88102549A EP88102549A EP0287772B1 EP 0287772 B1 EP0287772 B1 EP 0287772B1 EP 88102549 A EP88102549 A EP 88102549A EP 88102549 A EP88102549 A EP 88102549A EP 0287772 B1 EP0287772 B1 EP 0287772B1
Authority
EP
European Patent Office
Prior art keywords
tube
heating element
water
resistance element
thermostat
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.)
Expired - Lifetime
Application number
EP88102549A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0287772A1 (en
Inventor
Sandro Marcer
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 EP0287772A1 publication Critical patent/EP0287772A1/en
Application granted granted Critical
Publication of EP0287772B1 publication Critical patent/EP0287772B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/101—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply
    • F24H1/102—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply with resistance
    • 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
    • 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
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/58—Heating hoses; Heating collars

Definitions

  • This invention relates to a heating element for household electrical appliances.
  • a further drawback of known methods is the need in such household electrical appliances to use safety and operational thermostats which have necessarily to be installed in the bottom of the appliance and inevitably require this to be drilled.
  • Another drawback is that if the minimum water quantity to be heated, and already representing energy wastage, corresponds to that required for operating the household electrical appliance at full load, it is certainly excessive for reduced loads, at which it also represents excessive detergent and electricity consumption.
  • DE-A1-2.913.988 discloses a porcupine wire coil of an electric resistance which is positioned in a tube having an electrically insulating inside in which the peaks of the coil convolutions are embedded so as to hold the coil convolutions spaced from each other. This device is particularly used to bring air or liquid flows a high rate and temperature.
  • US-A-786.257 discloses an electric heater consisting of a conductor wound around a core to which a plastics refractory material is applied to form a tubular sheat. This device is employed in electric lamps of the Nernst type.
  • DE-A1-3.531.424 describes a heater element for heating liquids comprising a canalization in which a coil heater is disposed. This device can be used in the wash circuit of household electrical appliances.
  • a water heating element is used in the wash circuit of a household electrical appliance as described in claim 1.
  • the element according to the invention consists essentially of a plastics tube 1 in which an armoured resistance element 2 disposed in a coil arrangement is embedded.
  • the plastics material is preferably formed by nylon, resistant at least at 250 C.
  • the thickness of the plastics tube 1, the diameter of the armoured resistance 2 and their mutual position are chosen so that the resistance element 2 protrudes from the inner surface of the tube 1 but not from the external one, as it clearly results in figure 2.
  • thermostat 3 Also embedded in the thickness of the tube 1 there is a safety thermostat 3 which is electrically connected into the power supply circuit of the resistance element 2. Further operational thermostats 4 and 5 can also be embedded in the tube 1, as clarified hereinafter.
  • the described heating element is connected into the spray circuit of a household electrical appliance such as a dishwasher.
  • a pump 7 which has its delivery side connected to the two rotary sprinklers 8 provided in the dishwasher wash compartment, and its suction side connected to the bottom of the wash compartment.
  • the operation of the element according to the invention is as follows: during filling, a valve 9 is opened to allow water feed from the outside. After filling, the valve 9 is closed and the pump 7 and resistance element 2 of the device 6 are powered. As the water circulated by the pump 7 passes through the tube 1, it is gradually heated and emerges from the rotary sprinklers 8 at a temperature which increases until the predetermined temperature for the particular chosen wash cycle is reached. Depending on the particular stage in the wash cycle, the water can be circulated either alone or together with detergent fed simultaneously with it or separately. In any case the water always ensures that the resistance element 2 is kept at an enough low temperature value so not to cause the melting of the plastics tube.
  • the safety thermostat 3 is provided, which is adjusted at a temperature value higher than that most admissible for the water to be heated, but much lower than the temperature value which could cause the damaging of the plastics tube 1.
  • the tube 1 is kept horizontally, with the safety thermostat 3 placed in the higher side of this. In such a way the heating device always operatese in safety condition, since the side of the tube 1 in which the thermostat 3 is embedded is certainly the more stressed in the case of lack of water.
  • thermostats 4 and 5 which have the function of interrupting the feed of the electrical resistance, but have operating values corresponding to the operating temperatures for different wash cycles foreseen for the machine.
  • the heating element according to the invention has numerous advantages over conventional heating elements, and in particular, compared with a resistance element immersed in the water lying in the bottom of the appliance:

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
EP88102549A 1987-02-24 1988-02-22 Heating element for household electrical appliances Expired - Lifetime EP0287772B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8784117A IT1214261B (it) 1987-02-24 1987-02-24 Elemento scaldante per apparecchi elettrodomestici.
IT8411787 1987-02-24

Publications (2)

Publication Number Publication Date
EP0287772A1 EP0287772A1 (en) 1988-10-26
EP0287772B1 true EP0287772B1 (en) 1992-05-13

Family

ID=11324252

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88102549A Expired - Lifetime EP0287772B1 (en) 1987-02-24 1988-02-22 Heating element for household electrical appliances

Country Status (5)

Country Link
EP (1) EP0287772B1 (it)
DE (1) DE3870975D1 (it)
ES (1) ES2031938T3 (it)
IT (1) IT1214261B (it)
TR (1) TR23571A (it)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3903649C1 (en) * 1989-02-08 1990-04-12 Tuerk & Hillinger Gmbh, 7200 Tuttlingen, De Electric flow heater for liquids
IT1260581B (it) * 1992-02-05 1996-04-16 Salvatore Mario Pandolfo Lavabiancheria e lavastoviglie con elemento riscaldante e attivante ildetersivo a contatto parzializzato, tramite fori, col liquido da riscaldare.
ITUB20159319A1 (it) * 2015-12-29 2017-06-29 Carlo Rupnik Concentratore tubolare per irraggiamento concentrico di onde elettromagnetiche
DE102019003811A1 (de) * 2019-05-31 2020-12-03 Valeo Thermal Commercial Vehicles Germany GmbH Elektrisches Heizgerät

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3531424A1 (de) * 1984-09-10 1986-04-17 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Elektrischer heizkoerper

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US938237A (en) * 1908-04-04 1909-10-26 John Arthur Hunnewell Electrically-operated water-heater.
US4207457A (en) * 1978-06-29 1980-06-10 The Kanthal Corporation Porcupine wire coil electric resistance fluid heater
DE3531525C1 (de) * 1985-09-04 1987-01-22 Daimler Benz Ag Vorbauanordnung fuer Nutzfahrzeuge,insbesondere fuer Omnibusse

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3531424A1 (de) * 1984-09-10 1986-04-17 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Elektrischer heizkoerper

Also Published As

Publication number Publication date
IT1214261B (it) 1990-01-10
DE3870975D1 (de) 1992-06-17
IT8784117A0 (it) 1987-02-24
TR23571A (tr) 1990-04-03
ES2031938T3 (es) 1993-01-01
EP0287772A1 (en) 1988-10-26

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