Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
  • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
  • F23D14/06—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with radial outlets at the burner head
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
  • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
  • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
  • C03C10/0036—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and a divalent metal oxide as main constituents
  • C03C10/0045—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and a divalent metal oxide as main constituents containing SiO2, Al2O3 and MgO as main constituents
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
  • F24C15/00—Details
  • F24C15/10—Tops, e.g. hot plates; Rings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
  • F24C3/00—Stoves or ranges for gaseous fuels
  • F24C3/08—Arrangement or mounting of burners
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2212/00—Burner material specifications
  • F23D2212/10—Burner material specifications ceramic
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
  • F23D2900/00001—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas local catalytic coatings applied to burner surfaces

Definitions

• the present invention relates burner cap and / or pot carrier from cleaning friendly, easy to process glass ceramic.
• the present invention further relates to a gas hob and a gas hob, which comprise at least one burner cap and / or pot carrier according to the manner set forth above.
• Gas stoves or electric / gas stoves with glass ceramic cooking surfaces have been known and commercially available for several years. Similar to the conventional stainless steel or steel enamel bowls, these cooking appliances are operated with atmospheric gas burners and are characterized by a comparatively aesthetic appearance and a high degree of ease of cleaning.
• glass ceramics of lithium aluminosilicates such as disclosed in WO 97/00407
• this material is generally characterized by very low thermal expansion coefficients, whereby a high resistance to temperature changes of several hundred Degree is reached.
• These glass ceramics are produced starting from so-called precursor glass.
• precursor glass The specific chemical composition of the precursor glass in this case allows a controlled crystallization, which is initiated and controlled by a suitable thermal treatment (ceramization).
• the aforementioned glass-ceramics are in principle suitable for simple geometries (such as flat plates), but a more complex three-dimensional shaping can only be achieved with great effort.
• the approach is known to pour or press the precursor glass before the ceramization process in a mold with the desired geometry. In this case, however, the problem often arises that the viscosity of the precursor glass at the time of thermal ceramization is too high, whereby only bends or deformations with high radii of curvature are possible.
• the application WO 01/50065 discloses a burner cap of transparent borosilicate glass for visual control of the burner flame.
• This borosilicate is characterized by excellent thermal shock resistance and high contact temperature in order to meet the requirements of the gas burner flame.
• the object of the present invention is therefore to provide separately from the cover plate of the gas hob mounted burner cap and pot or pan carrier, which are also easy to clean, a Provide an appealing appearance, can be easily produced and offer a simple way of heat indication.
• the glass-ceramic material used for the present invention is characterized by excellent thermal shock resistance, chemical resistance and mechanical resistance.
• glass-ceramic material used for the present invention is the ease of processing. Since this can be cast in a particularly advantageous manner during the manufacture of the burner cap and the pan or pot carrier in molds or hot-formed, it is possible to form a number of three-dimensional shapes.
• the glass ceramic provided for use according to the invention does not contain any polybrominated biphenyl derivatives, polybrominated diethyl ether derivatives, decabromodiphenyl ethers and compounds of the elements lead, mercury, cadmium and chromium. Therefore, the risk of release of potential toxic and hazardous substances during use of the glass-ceramic is eliminated.
• the glass-ceramic composition disclosed herein allows integrated heat indication by allowing the glass-ceramic to change color when exposed to heat. Thus, the consumer receives visually appealing manner immediate visual information about the temperature of the heated components.
• the present invention relates to a gas hob, which has at least one removable burner cover or at least one removable pot or pan carrier made of glass ceramic material, and a gas hob, which has at least one gas hob according to the above-mentioned type.
• composition of the glass-ceramic material preferably comprises the following constituents in the proportions by weight stated below:
• composition of the glass-ceramic comprises essentially the following constituents in the proportions by weight stated below:
• composition of the glass-ceramic essentially comprises the following constituents in the proportions by weight stated below:
• the glass ceramic composition contains no components except Si0 2 , Al 2 0 3 , MgO, Ti0 2 , ZnO, Zr0 2 in the abovementioned proportions by weight.
• the determination of the glass-ceramic composition can be carried out, for example, by energy-dispersive X-ray spectroscopy (EDX).
• EDX energy-dispersive X-ray spectroscopy
• the glass ceramic according to the invention may contain one or more oxides of monovalent metals (such as Li 2 O, Na 2 O, Cs 2 O or K 2 O), preferably in each case in an amount of 15 wt. % Or less.
• the respective amount of the monovalent metal oxides is 5% by weight or less, further preferably 2% by weight or less.
• the glass-ceramic according to the invention may additionally contain additives which are selected in particular from further oxides of trivalent elements (eg Bi 2 O 3 ), further oxides of tetravalent elements (eg SnO 2 and GeO 2 ), oxides pentavalent elements (eg P 2 O 5 or Bi 2 O 5 ), melt accelerators, colorants and fluorescers.
• additives which are selected in particular from further oxides of trivalent elements (eg Bi 2 O 3 ), further oxides of tetravalent elements (eg SnO 2 and GeO 2 ), oxides pentavalent elements (eg P 2 O 5 or Bi 2 O 5 ), melt accelerators, colorants and fluorescers.
• colorants and fluorescers are coloring or fluorescent oxides of d and f elements, e.g. the oxides of Sc, Ti, Mn, Fe, Ag, Ce, Pr, Tb, Er and Yb, especially Ti, Mn, Fe, Ag, Ce, Pr, Tb and Er.
• the crystalline phase of the glass-ceramic is composed of aluminum-magnesium-silicate particles of 5 to 200 nm in size. In a particularly preferred embodiment, the crystalline phase of the glass ceramic is composed of aluminum-magnesium silicate particles of 10 to 100 nm in size.
• the glass-ceramic preferably has a flexural strength of 60 to 120 N / mm 2 , in particular from 60 to 90 N / mm 2 (or MPa). In a particularly preferred Embodiment, the glass-ceramic has a flexural strength of 70 to 80 N / mm 2 (or MPa).
• the determination of the flexural strength can be carried out by numerous methods known in the art. Examples include methods that involve a 3 or 4 point bend, with the test specimen on two blades at a defined distance, and through one via one (3-point bend assembly) or two rolls (4-point bend assembly) of above continuously increasing force is loaded.
• the glass-ceramic has a density of 2.4 to 2.7 g / cm 3 .
• a density of 2.5 to 2.6 g / cm 3 is particularly preferred.
• the glass-ceramic has a Vickers hardness VHN (Vickers Hardness Number) of 4-10 3 to 7-10 3 N / mm 2 (or 4 to 7 GPa). Particularly preferred is a Vickers hardness of 5-10 3 to 6-10 3 N / mm 2 (or 5 to 6 GPa).
• VHN Vickers Hardness Number
• the hardness of Vickers can be determined by known static penetration method for hardness testing, in which an equilateral diamond pyramid is pressed with an opening angle of 136 ° under a specified test force in the workpiece.
• the impression surface is determined from the length of the diagonal of the lasting impression determined by means of a measuring microscope.
• the Vickers hardness VHN is calculated from the ratio of test force to impression surface.
• the glass ceramic is preferably characterized in that it has a linear thermal expansion coefficient a of less than 3-10 "7 K " 1 .
• the glass ceramic up to a temperature of 1200 ° C, no transformation in the glass phase.
• the determination of a and the transformation temperature of the glass-ceramic can be carried out by known analysis methods. Examples are static or called dynamic dilatometric method, in which using a dilatometer, the thermal expansion of the material can be determined as a function of temperature
• the hard glass or the glass ceramic has a refractive index determined by means of refractometry of 1.4 to 1.5, whereby an advantageous appearance is achieved.
• Suitable methods for shaping the glass-ceramic are not limited to hot-forming pressing. Rather, the shaping by any method known in the art, such. B. vacuum deformation, sintering or by means of forming rollers.
• Burner cap and pot carrier according to the present invention may be present in a separate version or be designed such that the burner cap at the same time forms the pot or pan carrier.
• burner caps and pan supports according to the present invention are easily removed by the user from the hob and / or can be cleaned in terms of their dimensions in conventional dishwashers, their shape is not subject to any particular restrictions.
• the pot carrier may for example be designed as a frame construction with inwardly projecting fingers, which may also have multi-level bearing surfaces to meet the requirements of so-called wok burners with multiple flame rings or a reliable storage option for different sized Gargut therenisse Offer.
• the exemplary composition is characterized by excellent thermal shock resistance, chemical resistance and mechanical resistance.
• the material has an attractive appearance and advantageous ease of cleaning.
• the glass ceramic offers a visually appealing way and way by means of color change under heat information about the temperature of the components. Compression of the exemplary glass-ceramic composition into molds shows that designs with advantageously low radii of curvature are possible.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Combustion & Propulsion (AREA)
• Geochemistry & Mineralogy (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Dispersion Chemistry (AREA)
• Crystallography & Structural Chemistry (AREA)
• Ceramic Engineering (AREA)
• Cookers (AREA)
• Glass Compositions (AREA)
• Gas Burners (AREA)
• Baking, Grill, Roasting (AREA)

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• 2012
  • 2012-08-14 ES ES201231302A patent/ES2442968A1/es not_active Withdrawn
• 2013
  • 2013-07-31 WO PCT/IB2013/056289 patent/WO2014027270A2/fr not_active Ceased

Patent Citations (2)

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