EP0890669A2 - Machine à laver et/ou à sécher avec un élément de chauffage électrique - Google Patents

Machine à laver et/ou à sécher avec un élément de chauffage électrique Download PDF

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Publication number
EP0890669A2
EP0890669A2 EP98112903A EP98112903A EP0890669A2 EP 0890669 A2 EP0890669 A2 EP 0890669A2 EP 98112903 A EP98112903 A EP 98112903A EP 98112903 A EP98112903 A EP 98112903A EP 0890669 A2 EP0890669 A2 EP 0890669A2
Authority
EP
European Patent Office
Prior art keywords
heating element
ceramic
washing
heating
drying device
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Withdrawn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
EP98112903A
Other languages
German (de)
English (en)
Other versions
EP0890669A3 (fr
Inventor
Dieter Schulz
Dieter Dipl.-Ing. Schröder
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.)
BSH Hausgeraete GmbH
Original Assignee
Bosch Siemens Hausgerate GmbH
BSH Bosch und Siemens Hausgeraete GmbH
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 Bosch Siemens Hausgerate GmbH, BSH Bosch und Siemens Hausgeraete GmbH filed Critical Bosch Siemens Hausgerate GmbH
Publication of EP0890669A2 publication Critical patent/EP0890669A2/fr
Publication of EP0890669A3 publication Critical patent/EP0890669A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment
    • 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
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds

Definitions

  • the present invention relates to an electric washing and / or drying device, in particular for laundry, with at least one heating element with an electrical heating conductor.
  • Washing and / or drying devices generally have heating devices (DE 38 32 144 A1), for heating, for example, the wash liquor or the Serve dry air.
  • electrical heating elements are used for this purpose, one metallic heat conductor, a heat-resistant, insulating intermediate layer and one have metallic outer layer which surrounds the heating conductor and the intermediate layer and delimited from the external medium.
  • the intermediate layer usually consists of loose magnesium oxide sand.
  • the metallic outer layer is resistant to corrosion through a suitable selection of materials To protect in a special way, so the life of the heating element and thus of the washing and / or drying device is not shortened. In particular, this is at Washing machines the case in which the heating element at elevated temperatures with liquids comes into contact.
  • heating elements with a metallic outer layer come into contact come with water, depending on the water hardness to a more or less strong and resistant Limescale. This limescale deteriorates the heat transfer from the heating element to the surrounding medium, increases energy consumption and promotes corrosion.
  • the electrical insulating layer used in conventional heating elements in particular the very poorly heat-conducting magnesium oxide sand has the disadvantage that Heat transfer from the heating conductor to the outer layer or to the surrounding medium to deteriorate sharply. This results in a washing and / or drying device reduced efficiency, high energy consumption and deteriorated dynamic Behavior because the heat transfer to the medium to be heated is slow can happen.
  • the present invention is therefore based on the object of a washing and / or Improve drying device of the type mentioned in such a way that a faster Heat transfer to the medium to be heated takes place, permanent calcification and Corrosion can be avoided, the heating element has a longer service life and one has a smaller size.
  • the heating element of the Washing and / or drying device on a ceramic surface causing the corrosion prevents and any limescale deposits that form on the heating element are pushed off are, so that the heat transfer is improved, the energy consumption is reduced and the service life of the washing and / or drying device can be extended considerably.
  • the ceramic heating element can already do all the desired in its manufacture Forms are adapted.
  • the heating element can be bent like a barrel Shape of the lower area in the tub of a drum washing machine be reshaped.
  • the smooth surface of the ceramic radiator offers accruing fluff no way to stick. Because of the small overall length and the simply structured surface of a ceramic radiator compared to known ones Tubular radiators is also a complicated radiator holder in the usual size superfluous.
  • the heating element advantageously has an electrical heating conductor made of conductive ceramic on. This prevents corrosion. Any lime deposits on the ceramic The heating element can no longer last even if it comes into contact with calcareous liquid start. From the use of ceramic material for both the heat conductor and the surface also results for both very similar properties, in particular similar mechanical properties, so that the connection between the two is particularly easy.
  • the heating element has a layer of insulating ceramic that coats the electrical heating conductor assembled into a one-piece body, preferably is sintered.
  • an insulating layer can be used due to the insulating outer layer Intermediate layer can be dispensed with, so that there is a smaller size and improve heat transfer and improve dynamics, because by reducing the ambient layer to be heated by the heating conductor Heating element responds faster. Due to the composition in one piece Bodies, especially through sintering, result in improved mechanical properties, especially in terms of stability and shock resistance.
  • the layer of insulating ceramic is advantageously thin, so that there are more Improvements in heat transfer, size and dynamics surrender.
  • the heating element advantageously has ceramic contacts that conduct electricity well on, which are electrically connected to the ceramic heating conductor and are guided to the surface of the heating element.
  • the use of ceramic material for the contacts has the consequence that they are free of corrosion and calcification and with other ceramic parts of the heating element can be connected particularly advantageously.
  • the individual ceramic parts are preferably connected to one another by sintering.
  • the invention relates to the use of an improved heating element ceramic surface according to one of the aforementioned embodiments in washing and / or Dryers that are particularly suitable for laundry.
  • the tub 1 is something of the round Form deviates downwards and occupies this expanded space Heating element 3, the shape of the lower shape of the tub 1 adapts and held by simple radiator holder 4 at the bottom of the tub becomes.
  • the heating element 3 has an outer layer 5 made of an insulating ceramic with a ceramic surface 6, one embedded in the outer layer 5 electric heating conductor 7 made of conductive, doped ceramic and highly conductive ceramic Contacts 8, which are electrically conductively connected to the heating conductor 7 for supplying current and are guided to the surface 6 of the heating element 3.
  • the ceramic outer layer 5 is connected to the ceramic for connection to one another Heating conductor 7 sintered into a one-piece body. Furthermore, all ceramic Parts, the outer layer 5, the heat conductor 7 and the contacts 8, in one piece Bodies are sintered.
  • the outer layer 5 is in one Another embodiment, not shown, possible, the outer layer 5 as a thin Train coating.
  • a washing and / or drying device is included with the solution according to the invention created at least one electric heating element in which the heating element is not permanently calcified, the heat is better transferred to the medium to be heated, not corroded and has a reduced size.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
EP98112903A 1997-07-11 1998-07-10 Machine à laver et/ou à sécher avec un élément de chauffage électrique Withdrawn EP0890669A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19729848A DE19729848A1 (de) 1997-07-11 1997-07-11 Elektrisches Wasch- und/oder Trockengerät mit elektrischem Heizelement
DE19729848 1997-07-11

Publications (2)

Publication Number Publication Date
EP0890669A2 true EP0890669A2 (fr) 1999-01-13
EP0890669A3 EP0890669A3 (fr) 1999-06-02

Family

ID=7835460

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98112903A Withdrawn EP0890669A3 (fr) 1997-07-11 1998-07-10 Machine à laver et/ou à sécher avec un élément de chauffage électrique

Country Status (2)

Country Link
EP (1) EP0890669A3 (fr)
DE (1) DE19729848A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1293597A3 (fr) * 2001-09-17 2004-08-25 Bleckmann GmbH Elément chauffant plat pour le chauffage direct d'un milieu

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT218167Z2 (it) * 1988-05-30 1992-04-08 Zanussi A Spa Industrie Dispositivo di riscaldamento per macchina combinata per il lavaggio e l'asciugatura della biancheria.
IT1225119B (it) * 1988-07-25 1990-11-02 Zanussi A Spa Industrie Dispositivo riscaldante per macchine lavatrici e/o asciugatricidi biancheria
DE4325606A1 (de) * 1993-07-30 1995-02-09 Bach Wolfdietrich Keramisches Heizelement sowie Verfahren zur Herstellung eines solchen Heizelements

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1293597A3 (fr) * 2001-09-17 2004-08-25 Bleckmann GmbH Elément chauffant plat pour le chauffage direct d'un milieu

Also Published As

Publication number Publication date
EP0890669A3 (fr) 1999-06-02
DE19729848A1 (de) 1999-01-14

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