EP0392162B1 - Gaskocheinrichtung mit wenigstens einem unter Glaskeramikplatte angeordneten Gasstrahlungsbrenner sowie Verfahren zum Verringern der Aufheizzeit einer derartigen Gaskocheinrichtung - Google Patents

Gaskocheinrichtung mit wenigstens einem unter Glaskeramikplatte angeordneten Gasstrahlungsbrenner sowie Verfahren zum Verringern der Aufheizzeit einer derartigen Gaskocheinrichtung Download PDF

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Publication number
EP0392162B1
EP0392162B1 EP90103076A EP90103076A EP0392162B1 EP 0392162 B1 EP0392162 B1 EP 0392162B1 EP 90103076 A EP90103076 A EP 90103076A EP 90103076 A EP90103076 A EP 90103076A EP 0392162 B1 EP0392162 B1 EP 0392162B1
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EP
European Patent Office
Prior art keywords
gas
burner
temperature
burner plate
cooking appliance
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.)
Expired - Lifetime
Application number
EP90103076A
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German (de)
English (en)
French (fr)
Other versions
EP0392162A3 (de
EP0392162A2 (de
Inventor
Kurt Dr. Schaupert
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.)
Schott AG
Carl Zeiss AG
Original Assignee
Carl Zeiss AG
Schott Glaswerke AG
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 Carl Zeiss AG, Schott Glaswerke AG filed Critical Carl Zeiss AG
Publication of EP0392162A2 publication Critical patent/EP0392162A2/de
Publication of EP0392162A3 publication Critical patent/EP0392162A3/de
Application granted granted Critical
Publication of EP0392162B1 publication Critical patent/EP0392162B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F24C3/04—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate
    • F24C3/06—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate without any visible flame
    • F24C3/067—Ranges
    • 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
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges

Definitions

  • the invention relates to a gas cooking device with at least one gas radiation burner arranged under an exhaust gas-tight glass ceramic hotplate with a burner plate, control devices for the gas supply, ignition and safety devices and monitoring devices for the temperature of the cover plate, and to a method for reducing the heating-up time of such a gas cooking device.
  • Gas cooking devices with gas radiant burner and glass ceramic hotplate have been described in numerous embodiments, e.g. in US Pat. No. 3,468,298, DE-OS 26 21 801, US Pat. No. 4,083,355 or US Pat. No. 4,201,184.
  • gas radiation burners the gas is burned on the surface of a burner plate made of porous ceramic.
  • one or more such gas radiation burners are arranged at a distance below a common glass ceramic plate known per se, a cooking point being formed by each burner on the upper side of the glass ceramic plate.
  • Each individual gas radiation burner is provided with an ignition device and with an ignition protection device to prevent fuel gas mixture flowing out unused.
  • the description of a burner plate can be found e.g. in EP-A 187 508.
  • the temperature of the radiating burner plate is between about 900 ° C and 950 ° C depending on the temperature resistance of the material.
  • the maximum amount of gas that can be fed to the burner is limited by design measures so that a maximum operating temperature is not exceeded, e.g. to protect the material of the burner plate or the cooking surface and to avoid unnecessary energy losses.
  • the permissible maximum temperature of glass ceramic cooktops is usually between about 700 ° C and 750 ° C. Because in pots with unsuitable bases or unoccupied hotplates with a high output set, temperatures of within a short time in the glass ceramic hotplate 900 ° C and more can occur, a temperature limiter is provided to protect the glass ceramic hotplate, by which such excess temperatures are reliably prevented. Such temperature limiters are described in detail, for example, in DE-OS 26 21 801 or US Pat. No. 4,201,184.
  • a regulation or control of the burner output For practical use for heating a cooking surface, in addition to a temperature limit, there must also be a regulation or control of the burner output.
  • Two principles are known for controlling the output: on the one hand the burner is operated continuously and the amount of gas supplied is reduced or increased in accordance with the required output and on the other hand the burner is operated in a clocked manner, i.e. the burner is always operated with the maximum gas volume and the required output results from the ratio of the switch-on time to the switch-off time (cycle ratio).
  • a power control can also be provided in which a temperature sensor regulates the power output as a function of the hotplate temperature, as is the case e.g. is described in detail in U.S. Patent No. 4,201,184.
  • the object of the invention is therefore to find a gas cooking device with a gas radiation burner and a glass ceramic hotplate, in which the heating-up time of the burner plate is considerably reduced after switching on, and also to find a method for reducing the heating-up time in a gas cooking device of the type mentioned.
  • the principle of the invention is thus that of the burner during its heating phase, i.e. after switching on (ignition) or when switching to full power, supply a gas quantity with which the hotplate would be overloaded in terms of temperature in the long term, since this gas quantity would cause such a high temperature when burned that e.g. the maximum temperature permitted for the ceramic of the burner plate or the cooking surface would be exceeded, or that inadmissibly high energy losses would occur.
  • this increased amount of gas is harmless as long as the permissible maximum temperature has not yet been reached in normal operation.
  • suitable measures or devices must be used to ensure that the amount of gas is throttled again to such an extent that, as with a conventional gas cooking device, the permissible maximum operating temperature cannot be exceeded.
  • This throttling can e.g. consist in that an additional valve, through which an additional amount of gas has been added to the normal gas flow, is closed again.
  • Another possibility can be that the entire gas supply system is designed for the increased amount of gas and that the gas flow is then throttled by switching on an aperture or by another reduction in the cross section of the gas line or by other measures known per se to reduce the mass flow of gas becomes.
  • the throttling must take place at the latest when the operating temperature of the hotplate is reached at full load.
  • the operating temperature at full load can fluctuate within certain limits permitted by the manufacturer of the cooking device, depending on the cooking conditions (e.g. pot quality, pot size, amount of food to be cooked).
  • a simple time control that is activated when the burner is ignited and / or when the burner is switched to full load is one option.
  • the burner is supplied with the increased amount of gas for a predetermined time and after this time the gas flow is throttled back to normal.
  • a time control can be produced particularly inexpensively and still works satisfactorily even when the burner plate is still hot when the time control is activated, since the radiant power increases very sharply as the temperature of the burner plate increases. The temperature rise in the upper output range of the burner is therefore no longer so rapid, so that in these cases too, the predetermined time has elapsed before destructive temperatures occur for the burner plate.
  • the time in which the burner can be operated with increased gas supply until the operating temperature is reached at full load depends on the temperature to be reached, on the calorific value of the gas and on the increased amount of gas supplied to the burner and can be easily determined experimentally. This time is usually between about 5 and 60 seconds. A time of less than 20 s, in particular less than 10 s, during which the burner plate is to glow visibly is preferred.
  • the amount of gas supplied to the burner or the gas / air mixture proportional to the amount of gas cannot be chosen arbitrarily high because the combustion must take place in the surface or in the pores of the ceramic burner plate. If the amount of gas is too high, the flow speed in the pores and bores of the burner plate becomes so high that the flame front migrates out of the burner plate and the burner no longer radiates.
  • the maximum amount of gas supplied to the burner or the gas / air mixture must therefore be selected so that the combustion still takes place in the burner plate. It is in the sense of rapid heating of the burner plate advantageous to choose the amount of gas as high as possible.
  • the amount of gas additionally supplied to the burner is usually about 10 to 40% of the maximum amount of gas permitted during continuous operation of the burner; this factor can also be higher in the case of special burner plates, as are known, for example, from EP-OS 187 508.
  • the second way of determining the time at which the gas quantity is throttled is to determine the temperature of the surface of the burner plate and to throttle the gas flow when the burner plate reaches a predetermined temperature.
  • the measurement of the temperature can be done by means known per se, such as e.g. B. by in, on or above the exhaust gas side, i.e. thermocouple arranged on the hot surface of the burner plate, e.g. Pt / Ir elements or by an electrical resistance, by an expansion element or by measuring the radiation emanating from the burner plate, in particular by measuring the color temperature or the radiation intensity.
  • the radiation measurement has the advantage that the actual measuring cell, e.g.
  • the radiation measuring cell is particularly advantageously arranged at a relatively cool point in the cooking device and the radiation emanating from the burner plate by means of a light guiding device, e.g. passed to the measuring cell by means of a glass fiber or a glass fiber bundle.
  • FIGS 1 and 2 show a glass ceramic cover 1, which serves as a cooking surface.
  • an infrared radiation heating element 2 which has a housing 3, which can be made of metal, and a porous (perforated) burner plate 5, which is arranged above the open upper part of the housing 3, for example by means of clips.
  • the housing 3 and the burner plate 5 form the burner chamber 4.
  • the burner plate 5 is usually round and can have a central opening 6.
  • the side wall of the housing 3, the gas mixing tube 7 is connected to the burner chamber 4, the other end of the mixing tube 7 is connected to the gas nozzle 8.
  • the gas nozzle 8 is connected to two gas supply pipes 21 and 22, of which the gas supply pipe 21 (main gas line) is used to supply the amount of gas required for normal operation of the burner and the gas supply pipe 22 (additional gas line) supplies the additional gas amount required for the heating phase.
  • the ring 9 is fastened by means of a circular, inwardly bent lip to the upper end of the housing 3, for example by welding.
  • the upper circular end of the exhaust ring 9 is shaped so that it is pressed resiliently against the cover plate 1 via an elastic, temperature-resistant sealing ring 10 can be.
  • an elongated opening is made, with which the exhaust pipe 11 is connected.
  • the exhaust ring 9 also has a borehole 12 for receiving a temperature limiter in the form shown as a rod expansion regulator 13 with switch 13A.
  • This temperature limiter serves to protect the glass ceramic cover plate 1.
  • the openings 14 and 16 serve to receive an ignition device, for example a spark plug 15 or a temperature sensor 17, as a fuse.
  • the function of temperature limiters, ignition devices and ignition fuses are known to the person skilled in the art and are not described in more detail.
  • the central opening 6 of the burner plate 5 is provided with a ceramic tube 6A, in which a thermal sensor 18 is arranged. This thermal sensor 18 is used for power control and enables fully automatic cooking. The function of such a controller is also well known and will not be explained in detail.
  • the opening 19 in the exhaust gas ring 9 serves to receive a further thermal sensor 20 which is in direct contact with the surface of the burner plate 5 on the exhaust gas side.
  • a further thermal sensor 20 which is in direct contact with the surface of the burner plate 5 on the exhaust gas side.
  • the temperature sensor 20 heated by the burner plate 5 detects the predetermined maximum temperature for the burner plate 5
  • the additional gas stream flowing through the line 22 is switched off. This prevents the burner plate 5 from overheating.
  • switches, valves, wiring or electrical devices have not been shown because these parts consist of conventional, commercially available components and have long been state of the art.
  • Both the temperature sensor 13 and the temperature sensor 20 can if necessary. be designed so that they have two switching points, such that a lower switching point emits the desired signal for the ignition protection and that the upper switching point serves the desired temperature limitation. In this way, the temperature sensor 17 for the ignition protection can be saved.
  • FIG. 3 shows a flowchart which shows an example of the sequence of the individual measures in a method of controlling the additional quantity via a temperature sensor on the burner plate.
  • the individual blocks in FIG. 3 can represent both operational steps and devices for carrying out such steps.
  • control is transferred to unit 26, likewise if unit 24 determines the continuation of the ignition (start) phase.
  • Unit 24 is provided so that a burner effect can be achieved as soon as possible even when igniting under reduced power.
  • Unit 26 determines whether the temperature of the burner plate is still below the maximum temperature. If this is not the case, the valve for the additional gas quantity is closed or remains closed by means of unit 25 and control is again taken over by unit 23. If the temperature of the burner plate is below the maximum permissible temperature of the burner plate, unit 27 checks whether the valve for the main gas line (line 21, FIG. 1) is open. If this is not the case, then opening the additional gas valve is also pointless, the additional gas valve is closed by means of unit 25 and control is passed back to unit 23. However, if the main gas valve is open, the additional gas valve is opened by unit 28 and control is transferred to unit 26. The loop formed by the units 26, 27 and 28 is then run through until either the burner plate has reached its maximum temperature or until the main gas valve is closed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Gas Burners (AREA)
  • Baking, Grill, Roasting (AREA)
EP90103076A 1989-04-13 1990-02-17 Gaskocheinrichtung mit wenigstens einem unter Glaskeramikplatte angeordneten Gasstrahlungsbrenner sowie Verfahren zum Verringern der Aufheizzeit einer derartigen Gaskocheinrichtung Expired - Lifetime EP0392162B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3912124 1989-04-13
DE3912124A DE3912124C1 (el) 1989-04-13 1989-04-13

Publications (3)

Publication Number Publication Date
EP0392162A2 EP0392162A2 (de) 1990-10-17
EP0392162A3 EP0392162A3 (de) 1991-05-02
EP0392162B1 true EP0392162B1 (de) 1992-04-15

Family

ID=6378592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103076A Expired - Lifetime EP0392162B1 (de) 1989-04-13 1990-02-17 Gaskocheinrichtung mit wenigstens einem unter Glaskeramikplatte angeordneten Gasstrahlungsbrenner sowie Verfahren zum Verringern der Aufheizzeit einer derartigen Gaskocheinrichtung

Country Status (6)

Country Link
US (1) US5024209A (el)
EP (1) EP0392162B1 (el)
JP (1) JP2566478B2 (el)
DE (2) DE3912124C1 (el)
ES (1) ES2031397T3 (el)
GR (1) GR3005006T3 (el)

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CN102032602A (zh) * 2009-09-29 2011-04-27 樱花卫厨（中国）股份有限公司 燃气灶安全检测系统

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DE19500263C2 (de) * 1995-01-06 1997-09-18 Cramer Gmbh Kochapparat mit zumindest einem abgedeckten Kochfeld und einem Strahlungsbrenner-Aggregat
US5641282A (en) * 1995-02-28 1997-06-24 Gas Research Institute Advanced radiant gas burner and method utilizing flame support rod structure
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DE10045484A1 (de) * 2000-09-14 2002-04-25 Schott Glas Kochfeld mit mindestens einem atmosphärischen Gasbrenner
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Also Published As

Publication number Publication date
ES2031397T3 (es) 1992-12-01
EP0392162A3 (de) 1991-05-02
DE3912124C1 (el) 1990-07-12
US5024209A (en) 1991-06-18
GR3005006T3 (el) 1993-05-24
JP2566478B2 (ja) 1996-12-25
JPH0363420A (ja) 1991-03-19
DE59000085D1 (de) 1992-05-21
EP0392162A2 (de) 1990-10-17

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