WO2003094577A2 - Ceramic heating element incorporating a thermal resistance - Google Patents
Ceramic heating element incorporating a thermal resistance Download PDFInfo
- Publication number
- WO2003094577A2 WO2003094577A2 PCT/IT2003/000231 IT0300231W WO03094577A2 WO 2003094577 A2 WO2003094577 A2 WO 2003094577A2 IT 0300231 W IT0300231 W IT 0300231W WO 03094577 A2 WO03094577 A2 WO 03094577A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heating element
- thermal resistance
- steam
- ceramic
- element according
- Prior art date
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 52
- 239000000919 ceramic Substances 0.000 title claims abstract description 28
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- 239000012530 fluid Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000006698 induction Effects 0.000 claims abstract description 3
- 238000004804 winding Methods 0.000 claims abstract description 3
- 239000000049 pigment Substances 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052742 iron Inorganic materials 0.000 abstract description 6
- 239000008236 heating water Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000003989 dielectric material Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004512 die casting Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000010409 ironing Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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)
Abstract
The invention is a new heating element manufactured with a ceramic paste (P) incorporating one or more thermal resistances (E) that can be constituted of a single filament through which electric current passes. The inside of the ceramic body (P) is provided with ducts and/or compartments for the passage of fluid, constituting steam generation chambers (Pv1) and steam conveyance units (Pv2) with relevant water inlet holes and steam outlet vents (Pf). With this element it is possible to produce iron soleplates, elements for heating water and fluids in general, containers, etc. The heating element may also incorporate one or more metal masses with winding, powered by an electric induction field.
Description
TITLE CERAMIC HEATING ELEMENT INCORPORATING A THERMAL
RESISTANCE
DESCRIPTION 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.
The production of said metal bodies requires the use of special dies for metal die-casting, which are rather expensive. The metal used is expensive and its die-casting requires considerable efforts and costly equipment.
In the die-casting of the metal body various polluting substances are released, which force manufacturers to purchase expensive purification systems. Furthermore, 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.
Furthermore, 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.
Even if a dielectric material is used, it is not infrequent that, due to impacts or exceptional overheating, the inner filament comes into contact with the metal body, thus transmitting electric currents to the body of the heating element.
To overcome all the drawbacks mentioned above, a new ceramic
heating element incorporating a thermal resistance has been designed and implemented.
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.
These and other direct and complementary aims are achieved through the implementation of 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
(A) in the shape of an iron soleplate.
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.
Inside the body (P) there are the compartments suitable for receiving water and converting it into steam (Pv1), the steam conveyance units
(Pv2) and the steam outlet vents (Pf).
In the upper part of the body (P) there is the connection mouth (Pi) with the conveyance duct of the water to be turned into steam, or of the steam generated by an external boiler. In the upper part of the body (P) there are also protrusions (Pa) suitable for connecting the heating element (A) with the other parts of the iron.
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.
It is possible to incorporate the thermal resistance (E) directly when moulding the body (P), with no need to add it by means of further processing.
The heating element (A) can be constructed in various shapes, as desired, creating at the same time also the necessary compartments
(Pv1 , Pv2) at the beginning of the moulding of the body (P), with no need to join it to other parts with sealing gaskets. The moulding of the body (P) of the new ceramic heating element (A) doesn't require expensive dies and no polluting substances are released or emitted during the moulding process.
It is possible to modify the shape of the ceramic heating element (A) with a simpler process and spending less money, since the moulds for ceramic are less expensive and easier to manufacture than dies for casting metal.
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.
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.
It may be effectively used in particular for domestic applications, in the manufacture of equipment for low-cost steam generation for cleaning, ironing, cooking food, etc. and also as heating body for air or water for the heating of rooms. Therefore, with reference to the above description and to the enclosed drawings, the following claims are put forth.
Claims
1. Heating element, characterized in that it comprises a ceramic paste (P) incorporating one or more thermal resistances (E).
2. Heating element according to claim 1 , characterized in that the thermal resistance (E) is constituted only by the filament through which electric current passes.
3. Heating element, characterized in that it comprises a ceramic paste (P) incorporating one or more metal masses with winding, powered by an electric induction field.
4. Heating element according to claims 1, 2, 3, characterized in that the inside of the ceramic body (P) is provided with ducts and/or compartments for the passage of fluid, constituting steam generation chambers (Pv1 ) and steam conveyance chambers (Pv2) with relevant water inlet holes and steam outlet vents (Pf).
5. Heating element according to claims 1 , 2, 3, 4, characterized in that pigments are added to the ceramic paste.
6. Heating element according to claims 1 , 2, 3, 4, 5, characterized in that it is a container.
7. Heating element according to claims 1 , 2, 3, 4, 5, 6, characterized in that a fluid with forced circulation comes into contact with it and/or passes through it.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003230205A AU2003230205A1 (en) | 2002-05-03 | 2003-04-14 | Ceramic heating element incorporating a thermal resistance |
| EP03723060A EP1506334A2 (en) | 2002-05-03 | 2003-04-14 | Ceramic heating element incorporating a thermal resistance |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITPD2002A000112 | 2002-05-03 | ||
| ITPD20020112 ITPD20020112A1 (en) | 2002-05-03 | 2002-05-03 | HEATING ELEMENT IN CONGLOBATING CERAMIC THERMOELECTRIC RESISTANCE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2003094577A2 true WO2003094577A2 (en) | 2003-11-13 |
| WO2003094577A3 WO2003094577A3 (en) | 2004-01-08 |
Family
ID=29287869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IT2003/000231 WO2003094577A2 (en) | 2002-05-03 | 2003-04-14 | Ceramic heating element incorporating a thermal resistance |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1506334A2 (en) |
| AU (1) | AU2003230205A1 (en) |
| IT (1) | ITPD20020112A1 (en) |
| WO (1) | WO2003094577A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3020125A1 (en) * | 2014-04-17 | 2015-10-23 | Ecodrop | HEATING BODY FOR THE GENERATION OF STEAM |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4622231A (en) * | 1982-03-08 | 1986-11-11 | Idea Network Company, Inc. | Convection food heating |
| DE4018533A1 (en) * | 1990-06-09 | 1991-12-12 | Thomson Brandt Gmbh | Steam iron which can be adapted in weight - to suit different items by adding additional base |
| EP0773557A2 (en) * | 1995-11-13 | 1997-05-14 | Sumitomo Wiring Systems, Ltd. | Heat-resistant electrical wire comprising a benzimidazole-based polymer coating |
| GB2333466A (en) * | 1997-12-22 | 1999-07-28 | Nigel Harold Morris | Electrical heater element |
| US6054690A (en) * | 1995-05-04 | 2000-04-25 | Norton Pampus Gmbh | Heating element, manufacturing process and application |
-
2002
- 2002-05-03 IT ITPD20020112 patent/ITPD20020112A1/en unknown
-
2003
- 2003-04-14 AU AU2003230205A patent/AU2003230205A1/en not_active Abandoned
- 2003-04-14 EP EP03723060A patent/EP1506334A2/en not_active Withdrawn
- 2003-04-14 WO PCT/IT2003/000231 patent/WO2003094577A2/en not_active Application Discontinuation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4622231A (en) * | 1982-03-08 | 1986-11-11 | Idea Network Company, Inc. | Convection food heating |
| DE4018533A1 (en) * | 1990-06-09 | 1991-12-12 | Thomson Brandt Gmbh | Steam iron which can be adapted in weight - to suit different items by adding additional base |
| US6054690A (en) * | 1995-05-04 | 2000-04-25 | Norton Pampus Gmbh | Heating element, manufacturing process and application |
| EP0773557A2 (en) * | 1995-11-13 | 1997-05-14 | Sumitomo Wiring Systems, Ltd. | Heat-resistant electrical wire comprising a benzimidazole-based polymer coating |
| GB2333466A (en) * | 1997-12-22 | 1999-07-28 | Nigel Harold Morris | Electrical heater element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3020125A1 (en) * | 2014-04-17 | 2015-10-23 | Ecodrop | HEATING BODY FOR THE GENERATION OF STEAM |
Also Published As
| Publication number | Publication date |
|---|---|
| ITPD20020112A1 (en) | 2003-11-03 |
| WO2003094577A3 (en) | 2004-01-08 |
| EP1506334A2 (en) | 2005-02-16 |
| AU2003230205A8 (en) | 2003-11-17 |
| AU2003230205A1 (en) | 2003-11-17 |
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