EP0708296B1 - Sicherheitseinrichtung für Gasstrahlungsbrenner - Google Patents

Sicherheitseinrichtung für Gasstrahlungsbrenner Download PDF

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Publication number
EP0708296B1
EP0708296B1 EP95112896A EP95112896A EP0708296B1 EP 0708296 B1 EP0708296 B1 EP 0708296B1 EP 95112896 A EP95112896 A EP 95112896A EP 95112896 A EP95112896 A EP 95112896A EP 0708296 B1 EP0708296 B1 EP 0708296B1
Authority
EP
European Patent Office
Prior art keywords
burner
plate
radiant gas
gas burner
burner plate
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
EP95112896A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0708296A1 (de
Inventor
Kurt Dr. Schaupert
Michael Kahlke
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.)
Ceramat S Coop
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 EP0708296A1 publication Critical patent/EP0708296A1/de
Application granted granted Critical
Publication of EP0708296B1 publication Critical patent/EP0708296B1/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
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/725—Protection against flame failure by using flame detection devices
    • 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
    • F23D14/12—Radiant burners
    • F23D14/16—Radiant burners using permeable blocks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/14—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermo-sensitive resistors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/105—Porous plates
    • 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
    • F23D2212/103—Fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/16—Measuring temperature burner temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/06—Fail safe for flame failures

Definitions

  • the invention relates to a safety device for gas radiation burners with an electrical fuse to prevent unused outflow Gas and related devices for igniting the gas or interrupt the gas supply when the flame goes out.
  • Gas radiation burners are known and for example in DE 24 40 701 C3 described. They are mainly characterized by porous, perforated Burner plates z. B made of ceramic, which is the mixing chamber of the gas burner lock upwards. In operation burn at the top of the Channels of the perforated or perforated burner plates small flames, through which the burner plates are made to glow and as radiant heaters Act.
  • the temperature of the radiating burner plates depends on the temperature resistance of the burner plate material between about 900 ° C and 950 ° C.
  • Radiant gas burners are used, among other things. in space heating, in Hot water conditioners, in drying systems and especially in gas cooking devices.
  • thermoelectric monitoring for example, the ignition device or the main burner only an indirect control of the proper Represents operation of the burner.
  • the object of the invention is to create a cost-effective, reliable Safety device for gas radiant burners that monitor allowed directly at the location of the flame.
  • the burner plate itself is used for ignition protection.
  • the invention takes advantage of the fact that the Usually used burner plate materials, such as. B. ceramics or metals, have a strongly temperature-dependent electrical resistance. The operating state of the burner can thus be simple on the measurement of the electrical resistance of the burner plate material be recorded.
  • All burner plate materials are suitable for the present invention, whose electrical resistance is in the for the present application relevant temperature range of 100 - 900 ° C sufficiently strong and changes sufficiently quickly. For a simple regulation, it is sufficient in the Rule off when the resistance is within the temperature range described changes by at least 10%, but a change by 20% is preferred. The The rate of change in temperature and thus the resistance must be be so large that the ones prescribed in the relevant standards (for Europe EN 30) Safety time between extinguishing the flame and blocking the Gas supply or re-ignition is maintained.
  • the invention is preferably used in burner plates made of fiber material, for example made of metal or ceramic fibers because their thermal Mass is very low, resulting in a rapid change in temperature and resistance leads.
  • Burner plates from Global are particularly preferred Environmental solutions made of SiC fibers, such as z. B. in Advanced Gas-Powered Smoothtop, Proceedings of the International Appliance Technical Conference, Madison, Wisconsin, May 10-11, 1994. This Burner plate material not only has a suitable resistance / temperature curve on, it also speaks because of its low thermal Mass very quickly to changes in burner performance. details this is explained in the exemplary embodiment.
  • Suitable evaluation circuits are known in the prior art and in numerous embodiments.
  • an evaluation circuit has the following elements: current source, signal amplifier, switching amplifier and solenoid valve.
  • the structure of such a circuit is known to the person skilled in the art.
  • the evaluation takes place via the absolute values of the resistance signal.
  • So z. B. a predetermined resistance value that corresponds to a certain current can be used as a threshold value for triggering the re-ignition or switching off the gas supply.
  • a burner plate made of SiC fibers with the usual dimensions of z. B. 180 mm diameter, for example after 5 sec, a temperature of about 700 ° C.
  • the specific electrical resistance of a suitable SiC fiber material drops, for example, from 2 ⁇ 10 4 to below 10 3 ⁇ ⁇ cm.
  • the resistance value for a particular burner in both cold and is also known in the hot state these two values, if necessary under Add a security surcharge to take into account a possible Resistance aging, to monitor the burner using a suitable evaluation circuit.
  • the resistance is of the order of magnitude of the upper value, it shows that no flame burns what a new ignition or after several unsuccessful ignition attempts or After a predetermined period of time, the gas supply is switched off. If the resistance is in the range of the lower value, the burner burns perfectly. If the resistance is very small, there is a short circuit and if the resistance is extremely high, there is an interruption, both of which should lead to the gas supply being switched off for safety reasons.
  • the change in the resistance signal can also be used used over time.
  • the Evaluation circuit additionally a differentiator.
  • the change of the signal becomes very large when it is switched on or off (see also Figure 6) and their evaluation represents a procedure that also includes the safety times adheres to, but at the same time from slow material changes (such as aging) or a drift of the evaluation electronics is free. Do not kick when switching on, or when switching off, a change in resistance which is a sign that there is a short or an open circuit, what leads to the safety circuit responding.
  • DC voltage, AC voltage or a pulse-shaped signal can be used for electronic evaluation. Since the resistance of the plate in Operation must be in a very specific area, this can be used for detection of short circuits or interruptions in the supply line between the burner plate and electronics are used.
  • the evaluation can also be pulse-shaped Signals used to improve the security of the overall system as there is not only a need to have a voltage here (which may can also occur as a disturbance), but the signal is also correct Frequency must have.
  • the temperature measuring resistor according to the invention made of burner plate material can also be used to monitor the temperature of the burner plate become.
  • burner plates made of fiber material e.g. B. SiC fibers
  • the advantage here is that one has an easier contacting of the (wire-shaped) conductor. Farther is a very well-defined geometry due to the fiber / the fiber bundle given the temperature sensor, so that only small tolerances in the manufacture given are.
  • the Burner plates do not consist entirely of SiC; the only important thing is that the heated top layer consists of SiC.
  • the burner plate can For example, for large formats, a sandwich structure from a mechanical Have support structure and the active fiberboard.
  • the present invention has the particular advantage that security monitoring is made exactly at the point where actually Flames arise or go out. A detour via indirect measurements, such as common in the prior art is not required. This results in greater security. Furthermore, the invention is distinguished Safety device through a simple and inexpensive construction out.
  • Fig. 1 For three different SiC modifications that of manufactured by Nippon Carbon and are commercially available, the course of the specific electrical resistance with the temperature. This representation was taken from a manufacturer's data sheet. Man recognizes that SiC materials with very different resistance profiles are producible. It is the commercially available SiC materials around materials whose resistance increases sharply with increasing temperature sinks. Because these materials are often used for electrical heating for SiC materials, the course of the resistance with temperature usually specified by the manufacturer. Details about on which way the resistance behavior of these materials is targeted manufacturers can not be influenced, however, announce. See the expert therefore set himself the task for the invention Safety device to find suitable SiC materials, so he will i. a. use the manufacturer's information mentioned above, or the Determine resistance behavior yourself experimentally. He will then choose such materials as burner plate material, their resistance changes as much as possible in the temperature range of interest.
  • Figures 2 to 4 are different ways to attach the electrical contacts (1) to the burner plate (2) of a gas radiation burner (3).
  • the burner plate (2) is on the hot top during operation contacted.
  • the plate (2) must be of the metallic Mixing chamber (4) must be mounted electrically insulated.
  • the total resistance is made up of the parallel connection the resistors on the bottom and top of the plate (2) together. Is a Flame present, the resistance at the top drops so that the total resistance the arrangement drops.
  • the Contact made in the interior of the plate (2) on the underside, the plate (2) must not be installed insulated from the mixing chamber (4) become.
  • the electrical resistance between the two contact points in the hotter interior of the burner plate is much lower than that Resistance in the outside area, so that the current flow towards the edge is negligible is.
  • the electrical resistance in the Operation a parallel connection of resistance at the bottom of the plate (2) and resistance at the top as in Fig. 3.
  • the temperature of the contact point is also so low in burner operation ( ⁇ 100 ° C) that many Contacting procedures can be applied, e.g. B. gluing with conductive Epoxy resin.
  • the temperature can reach over 700 ° C, so that practically only welding processes can be used here.
  • the igniter such as customary in the prior art, mounted above the burner plate in the exhaust duct.
  • the plate was placed on a plate used for gas cookers with a glass ceramic cover Mixing chamber mounted; the leads were through the chamber floor guided.
  • the plate was connected to 6 V via a series resistor of 470 ⁇ AC voltage applied.
  • the voltage across the series resistor was measured with a Single channel recorder recorded.
  • the voltage drop became the electrical resistance of the burner plate during operation and its temporal Derivation calculated and shown in Figures 5 and 6.
  • the curves represent the course of the calculated values when the ignition and extinction of the Brenners.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Gas Burners (AREA)
  • Feeding And Controlling Fuel (AREA)
EP95112896A 1994-10-20 1995-08-17 Sicherheitseinrichtung für Gasstrahlungsbrenner Expired - Lifetime EP0708296B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4437510A DE4437510C1 (de) 1994-10-20 1994-10-20 Sicherheitseinrichtung für Gasstrahlungsbrenner
DE4437510 1994-10-20

Publications (2)

Publication Number Publication Date
EP0708296A1 EP0708296A1 (de) 1996-04-24
EP0708296B1 true EP0708296B1 (de) 1999-04-21

Family

ID=6531264

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95112896A Expired - Lifetime EP0708296B1 (de) 1994-10-20 1995-08-17 Sicherheitseinrichtung für Gasstrahlungsbrenner

Country Status (7)

Country Link
US (1) US5645411A (es)
EP (1) EP0708296B1 (es)
JP (1) JP2852010B2 (es)
KR (1) KR100341090B1 (es)
BR (1) BR9504459A (es)
DE (2) DE4437510C1 (es)
ES (1) ES2132479T3 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1310192B1 (it) * 1999-03-19 2002-02-11 Worgas Bruciatori Srl Metodo e mezzi per il controllo di sicurezza di bruciatori.
DE10003819C1 (de) * 2000-01-28 2001-05-17 Honeywell Bv Verfahren zum Betreiben eines Gasbrenners
ITTO20050685A1 (it) * 2005-09-30 2007-04-01 Indesit Co Spa Piano di cottura con bruciatore a gas comprendente un elemento semipermeabile
EP1811230B1 (de) * 2006-01-19 2016-01-06 Vaillant GmbH Verfahren zum Regeln des Brennstoff-Luft-Verhältnisses eines brennstoffbetriebenen Brenners

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL176301C (nl) 1974-08-24 Schwank Gmbh Toestel met ten minste een gasbrander voor een kookplaat.
DE2621801C2 (de) * 1976-05-15 1982-09-09 Schott Glaswerke, 6500 Mainz Glaskeramik-Kochfeld mit gasbeheiztem Strahlbrenner
YU109677A (en) 1976-05-15 1982-05-31 Spezialglas Gmbh Glass ceramic surface for cooking by means of the radiating gas-heated surface
DE2641274C3 (de) 1976-09-14 1979-08-23 Jenaer Glaswerk Schott & Gen., 6500 Mainz Sicherheitseinrichtung für gasbeheizte, transparente Glaskeramikkochflächen
DE3409334A1 (de) 1984-03-14 1985-09-26 Schott Glaswerke, 6500 Mainz Kochfeld mit gasbeheizten brennstellen und einer durchgehenden kochflaeche aus glaskeramik oder vergleichbarem material
DE3315745C2 (de) * 1983-04-30 1986-11-27 Schott Glaswerke, 6500 Mainz Kochfeld mit gasbeheizten Brennern und einer durchgehenden Kochfläche aus Glaskeramik oder vergleichbarem Material
JPS6252214A (ja) * 1985-08-30 1987-03-06 Toyota Motor Corp コンロツドの製造方法
DE3732271A1 (de) 1986-09-26 1988-03-31 Cramer Gmbh & Co Kg Gasherd mit zumindest einem kochstellenbrenner unter einer glaskeramikplatte
DE8625847U1 (de) 1986-09-26 1988-03-17 Cramer GmbH & Co KG, 5750 Menden Gasherd mit zumindest einem Kochstellenbrenner unter einer Glaskeramikplatte
ES2018440A6 (es) * 1989-12-11 1991-04-01 Catalana Gas Sa Perfeccionamientos en encimeras a gas.
AT396028B (de) * 1990-04-17 1993-05-25 Vaillant Gmbh Verfahren zur regelung eines voll vormischenden flaechenbrenners
DE4022844C1 (es) 1990-07-18 1992-02-27 Schott Glaswerke, 6500 Mainz, De
JP2648890B2 (ja) * 1990-12-28 1997-09-03 一郎 兼坂 ガスヒータ
GB2254945A (en) * 1991-04-19 1992-10-21 British Gas Plc Thermoelectric sensor for a gas burner
DE4326945C2 (de) * 1993-08-11 1996-10-24 Schott Glaswerke Regeleinrichtung für die Gaszufuhr zu einer Gaskocheinrichtung mit unter einer durchgehenden Kochfläche angeordneten Gasstrahlungsbrennern

Also Published As

Publication number Publication date
KR960014771A (ko) 1996-05-22
DE4437510C1 (de) 1996-04-04
EP0708296A1 (de) 1996-04-24
ES2132479T3 (es) 1999-08-16
BR9504459A (pt) 1997-05-20
US5645411A (en) 1997-07-08
DE59505699D1 (de) 1999-05-27
JP2852010B2 (ja) 1999-01-27
JPH08210630A (ja) 1996-08-20
KR100341090B1 (ko) 2002-12-28

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