WO1999021401A1 - Element chauffaut d'une grande efficacite - Google Patents

Element chauffaut d'une grande efficacite Download PDF

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Publication number
WO1999021401A1
WO1999021401A1 PCT/CH1998/000450 CH9800450W WO9921401A1 WO 1999021401 A1 WO1999021401 A1 WO 1999021401A1 CH 9800450 W CH9800450 W CH 9800450W WO 9921401 A1 WO9921401 A1 WO 9921401A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate
layer
heat
heating
heating element
Prior art date
Application number
PCT/CH1998/000450
Other languages
German (de)
English (en)
Inventor
Dusko Maravic
Original Assignee
Dusko Maravic
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 Dusko Maravic filed Critical Dusko Maravic
Priority to AU94272/98A priority Critical patent/AU9427298A/en
Publication of WO1999021401A1 publication Critical patent/WO1999021401A1/fr

Links

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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • H05B3/262—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base the insulating base being an insulated metal plate
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/021—Heaters specially adapted for heating liquids
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/022—Heaters specially adapted for heating gaseous material

Definitions

  • the invention relates to a heating element according to the preamble of claim 1.
  • metal preferably chromium steel, for example 1.4742 and 1.4016, can be used as the plate material. There is no indication of the dimensional stability of the panels in the event of thermal overloads.
  • the use of high-tech ceramics for hot plates has recently shown that induction cooking and roasting is still not the most perfect solution.
  • This material is characterized by unprecedented performance data such as energy consumption, heating time and working temperature.
  • the invention has for its object to provide a hotplate that is superior to the known hotplates in terms of performance and manufacturing costs.
  • this object is achieved by a heating plate which is characterized by the features specified in the characterizing part of patent claim 1.
  • Figure 2 is a plan view of the heating plate.
  • Fig. 3 shows an alternative embodiment of the plate
  • Fig. 4 is a heating element in the form of a tube
  • Fig. 5 shows an alternative embodiment of a rohrför
  • Fig. 1 shows the functional structure of the new heating plate.
  • the material of the insulation layer 2 must have good electrically insulating properties. In addition, their adhesion to plate 1 must be good. Finally, layer 2 must not stand out from plate 1, for example due to loss of adhesion or excessive expansion in relation to plate 1. Very good adhesion is achieved if an insulation layer is formed by galvanic aluminum oxidation. The resulting Al 2 0 3 layer has an extremely good adhesion.
  • the insulation layer 2 can also be produced by other thermal processes, for example plasma spraying, etc.
  • the layer thickness must be chosen so that it has sufficient adhesion to the plate 1 in order to guarantee long-term stability of this connection. As a rule, that is
  • Elongation of a thin layer is much greater than that of the bulk material. Nevertheless, there are limits to the layer thickness, for example because the adhesion of the layers with a distinct life of their own can weaken over time and can even be completely lost.
  • the insulation layer 2 must have a sufficient dielectric strength. At operating voltages of 230 or 400 V and at operating temperature of plate 1 of approx. 230 ° C, the layer must have a dielectric strength of 1250 V for 1 minute.
  • the layer 2 In addition to good electro-insulating properties, the layer 2 must also be a good heat conductor so that the heat generated in the heating layer 3 can reach the plate 1 through the insulation layer 2.
  • a thermal insulation 4 is advantageous for reducing the heat losses.
  • the operating temperature of the hotplate is limited to a maximum of 230 to 250 ° C. Higher temperatures are not necessary for cooking and roasting because, on the one hand, the heat is better used with good cookware and, on the other hand, the hotplate has an excellent response behavior.
  • the properties described above are due to the excellent thermal properties of the heating plate. They refer to the aluminum sheet material.
  • Aluminum has a very high heat penetration coefficient b (greater than 20,000 Wsl / 2 / Km2) and can therefore sense the slightest changes in temperature. This property is welcome on the one hand, on the other hand temperature sensors with a very short response time are required.
  • An ordinary Pt 100 for example, cannot be used for this because it is too slow. That is why the hotplate is operated with fully electronic, power-controlled temperature control.
  • Thin resistance layers made of nickel, titanium or other suitable materials are used as temperature sensors on the hotplate.
  • the use of fast reacting thermocouples and special thermocouples is also conceivable. Because the temperature difference between the bottom of the hotplate and the inside of the bottom of the pot is only a few ° K, these sensors can also easily determine the current temperature of the pot contents.
  • thermo-induced bending stress which causes the so-called bimetal effect, is so low that no significant curvature of the plate can occur.
  • any metallic or non-metallic material can be used for the heating plate, provided that it is a good conductor of heat. Whether it also has other good physical properties at the same time is secondary, since it is possible at any time to achieve the desired properties, such as hardness, color, etc. with additional treatments. Gray cast iron and other iron alloys, provided they are good heat conductors, can also be used.
  • the proposed hot plate is provided as a hot plate, preferably in connection with a new cookware. It has been proven that working temperatures, i.e. the hotplate temperatures can be kept very low with optimally coordinated cooking systems, although it initially appears that especially when roasting high temperatures of well over 250 ° C, usually over 350 ° C are required. However, it is not true that these temperatures are required. There is a tendency to heat a frying pan to such an extent that, thanks to the high temperature level, it has sufficient heat capacity so that it does not get too cold when the food, for example meat or fish, is inserted. One should not forget that when a large piece of meat is placed in a pan, the pan or the oil temperature below the meat cools from 300 ° C to around 70 ° C within a few seconds. As a rule, however, it takes more than 30 seconds for the
  • a layer of an electrically insulating compensation medium 7 is arranged between the two plates 1 and 9.
  • Thermally conductive pastes (WLP) with insulating properties can preferably be used as the compensation medium. They are usually provided with good thermal conductive ceramic fillings, which one
  • Insulation resistance of more than 1014 ⁇ From an energetic point of view, this solution is somewhat inferior to that shown in FIG. 1, since the heat-emitting plate 9 has an additional mass. This difference can be kept small, however, since the thickness of the plate 1 can now be reduced significantly. As a rule, a thickness of up to 2 mm is sufficient.
  • This version also allows you to choose from a number of additional materials.
  • materials with very specific properties can preferably be used without having to be good heat conductors.
  • Such a material can be, for example, gray cast iron, stainless steel, hardened non-ferrous metal alloys, electrically conductive high-tech ceramics, such as liquid phase sintered silicon carbide.
  • Fig.4 represents a heating tube, which is analogous to
  • FIG. 5 A further tubular solution, which is analogous to the version in FIG. 3, is shown in FIG. 5.

Landscapes

  • Cookers (AREA)
  • Resistance Heating (AREA)

Abstract

L'invention concerne un élément chauffant performant possédant une source de chaleur plane et une surface cédant la chaleur vers l'extérieur. Cet élément est notamment utilisé comme plaque de cuisson. Une couche en matière thermiquement conductrice (1) est dotée d'une couche d'isolation électrique (2) qui est à son tour recouverte d'une couche de résistance (3) faisant office de source de chaleur.
PCT/CH1998/000450 1997-10-21 1998-10-21 Element chauffaut d'une grande efficacite WO1999021401A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU94272/98A AU9427298A (en) 1997-10-21 1998-10-21 Highly efficient heating element

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH244997 1997-10-21
CH2449/97 1997-10-21

Publications (1)

Publication Number Publication Date
WO1999021401A1 true WO1999021401A1 (fr) 1999-04-29

Family

ID=4234091

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1998/000450 WO1999021401A1 (fr) 1997-10-21 1998-10-21 Element chauffaut d'une grande efficacite

Country Status (2)

Country Link
AU (1) AU9427298A (fr)
WO (1) WO1999021401A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1696181A1 (fr) * 2005-01-20 2006-08-30 The Heating Company BVBA Radiateur avec un élément de chauffage électrique externe
WO2011137266A1 (fr) 2010-04-28 2011-11-03 Watlow Electric Manufacturing Company Unité de chauffage à flux traversant

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4843218A (en) * 1985-12-20 1989-06-27 Bosch-Siemens Hausgerate Gmbh Heating element for thermal heating devices, especially cooking stations

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4843218A (en) * 1985-12-20 1989-06-27 Bosch-Siemens Hausgerate Gmbh Heating element for thermal heating devices, especially cooking stations

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1696181A1 (fr) * 2005-01-20 2006-08-30 The Heating Company BVBA Radiateur avec un élément de chauffage électrique externe
WO2011137266A1 (fr) 2010-04-28 2011-11-03 Watlow Electric Manufacturing Company Unité de chauffage à flux traversant
US9532404B2 (en) 2010-04-28 2016-12-27 Watlow Electric Manufacturing Company Flow through heater

Also Published As

Publication number Publication date
AU9427298A (en) 1999-05-10

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