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
  • D06F75/00—Hand irons
  • D06F75/08—Hand irons internally heated by electricity
  • D06F75/24—Arrangements of the heating means within the iron; Arrangements for distributing, conducting or storing the heat
• • 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

• This patent concerns electric heating elements and in particular it concerns a new ceramic heating element incorporating a thermal resistance that can be without insulating sheath. Heating elements incorporating a thermal resistance are used in many sectors. Said heating elements comprise a metal body, to which/into which the thermal resistance is joined/incorporated.
• the metal body has the function to transmit the heat generated by the thermal resistance to the surfaces or objects to be heated.
• Said body is preferably made from metal, in particular aluminium, due to the high capacity of this material to transmit heat.
• the thermal resistance comprises a filament surrounded, at regular intervals, by a dielectric material, the whole being incorporated into a metal sheath.
• the filament generates heat when electric current passes through it.
• the metal sheath protects the filament against impacts, stress and external agents.
• the dielectric material that surrounds the filament separates the same from the metal sheath, thus ensuring electric insulation between the filament and the sheath.
• the known heating elements built as described above have a series of drawbacks and problems. It is necessary to carry out the metal body in well defined shapes, according to the final use to which the heating element is destined, but it isn't possible to produce heating bodies with finite shapes, for example iron soleplates with included steam generation chamber, for which it is necessary to use other additional parts.
• said metal of the heating element body isn't suitable for special uses, for example for the contact with aggressive chemical substances, wears out and can be scratched very easily, thus limiting its effectiveness, for example for ironing purposes.
• the thermal resistances have high production costs, due also to the presence of the insulating material and of the protective sheath.
• said insulating layer and said protective sheath limit the transmission of heat and consequently to obtain a given temperature on the surface of the resistance it is necessary to heat the inner filament more.
• the bodies of the heating elements especially if made from aluminium, cool down very quickly and consequently require more electric energy to be maintained at operating temperature.
• One of the main aims of the new ceramic heating element is to maintain the quantity of heat longer, in order to ensure more energy saving.
• Another aim of the new ceramic heating element is to make it possible to use thermal resistances without particular electric insulation.
• a further aim of the new ceramic heating element is to ensure that the heating element itself can be cleaned easily.
• a further aim of the new ceramic heating element is to provide better resistance to scratching.
• a further aim of the invention is to obtain a ceramic heating element during the manufacture of which no polluting substances are emitted or produced.
• the new ceramic heating element incorporating a thermal resistance, comprising a properly shaped body made of ceramic material, inside which there is the thermal resistance without specific electric insulation, and, if necessary, ducts or inner compartments to heat fluids and/or generate steam.
• the characteristics of the new ceramic heating element will be better highlighted by the following description of one among many possible applications of the invention in question, illustrated in the attached drawings.
• Figure 1 shows a vertical cross section of the new heating element (A), while Figure 2 shows a possible application of the new heating element
• the new heating element (A) comprises a body (P) incorporating a thermal resistance (E).
• the body (P) is made from ceramic and is manufactured in the desired shape and size, as deemed suitable for the destination of use of the new heating element (A).
• the thermal resistance (E), with only the electric contacts (Ec) protruding from the body (P), is incorporated inside the body (P) itself, when deemed suitable during its construction process.
• This thermal resistance (E) is constituted only by the heating filament, without dielectric material and protective sheath, since the electric insulation and the protection of the themal resistance (E) are ensured by the ceramic body (P) itself.
• Figure 2 shows a practical application of the new heating element (A), shaped, for example, as an iron soleplate.
• connection mouth (Pi) with the conveyance duct of the water to be turned into steam, or of the steam generated by an external boiler.
• protrusions (Pa) suitable for connecting the heating element (A) with the other parts of the iron.
• thermal resistance (E) Inside the body (P) there is the thermal resistance (E), so that all the surfaces of said thermal resistance (E) are covered by the body (P), except for the electric contacts (Ec) that protrude from the upper part of the body (P) itself.
• the new ceramic heating element (A) constituted as described above offers considerable advantages. It isn't necessary to electrically insulate the thermal resistance (E), since ceramic is an excellent insulating material.
• the heating element (A) can be constructed in various shapes, as desired, creating at the same time also the necessary compartments
• the new ceramic heating element (A) is more resistant to scratches than the known heating elements.
• the new ceramic heating element (A) is heavier than the known metal heating elements having the same thickness and therefore it is possible to use less material to obtain iron soleplates.
• the new ceramic heating element (A) cools down more slowly and therefore fewer interventions of the thermal resistance (E) are necessary. It is possible to add pigments to the ceramic paste, in such a way as to obtain heating elements (A) of the desired, long-lasting colour.
• thermal resistance (E) It is also possible to replace the thermal resistance (E) with a metal mass with winding, powered by an electric induction field. In this way the electric connections between the heating element (A) and the power supply aren't necessary any longer and this guarantees total safety to the user.
• the heating element (A) described above can be successfully used both in the industry and in domestic applications. Said heating element (A) can be used, as an alternative to the known resistances, to heat various fluids and in particular water or air and can constitute the heating body of boilers, hair driers, irons and other domestic appliances.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Textile Engineering (AREA)
• Resistance Heating (AREA)
• General Induction Heating (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=29287869

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Family Cites Families (5)

• 2002
  • 2002-05-03 IT ITPD20020112 patent/ITPD20020112A1/it unknown
• 2003
  • 2003-04-14 EP EP03723060A patent/EP1506334A2/de not_active Withdrawn
  • 2003-04-14 WO PCT/IT2003/000231 patent/WO2003094577A2/en not_active Ceased
  • 2003-04-14 AU AU2003230205A patent/AU2003230205A1/en not_active Abandoned

Non-Patent Citations (1)

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