EP0026792B1 - Dispositif d'allumage et de contrôle d'une flamme - Google Patents

Dispositif d'allumage et de contrôle d'une flamme Download PDF

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Publication number
EP0026792B1
EP0026792B1 EP79103850A EP79103850A EP0026792B1 EP 0026792 B1 EP0026792 B1 EP 0026792B1 EP 79103850 A EP79103850 A EP 79103850A EP 79103850 A EP79103850 A EP 79103850A EP 0026792 B1 EP0026792 B1 EP 0026792B1
Authority
EP
European Patent Office
Prior art keywords
flame
deflector
ignition
directed towards
gas
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
Application number
EP79103850A
Other languages
German (de)
English (en)
Other versions
EP0026792A1 (fr
Inventor
Roger-Pierre Pehau
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.)
COSIC CONTROLS SpA
Original Assignee
COSIC CONTROLS SpA
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 COSIC CONTROLS SpA filed Critical COSIC CONTROLS SpA
Priority to AT79103850T priority Critical patent/ATE4744T1/de
Priority to EP79103850A priority patent/EP0026792B1/fr
Priority to DE7979103850T priority patent/DE2966194D1/de
Publication of EP0026792A1 publication Critical patent/EP0026792A1/fr
Application granted granted Critical
Publication of EP0026792B1 publication Critical patent/EP0026792B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q9/00—Pilot flame igniters
    • F23Q9/02—Pilot flame igniters without interlock with main fuel supply
    • F23Q9/04—Pilot flame igniters without interlock with main fuel supply for upright burners, e.g. gas-cooker burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q9/00—Pilot flame igniters

Definitions

  • the invention relates to a flame ignition and monitoring device with a pilot flame directed towards a burner and a lower flame flame directed towards a thermocouple.
  • a flame ignition and monitoring device with a pilot flame directed towards a burner and a lower flame flame directed towards a thermocouple.
  • a thermocouple is provided as a monitoring element for the gas burner, which is heated by a watch flame during normal operation. If the flame goes out, the thermocouple cools down and switches a safety valve via a bimetal, which prevents the further supply of gas to the gas burners.
  • the thermocouple is fastened in the vicinity of the watch flame using a holder.
  • thermocouple In the known flame ignition and monitoring devices, it is often not ensured that the thermocouple is protected against secondary radiation from the gas burner flame. If the guard flame fails, this can result in the fact that this secondary radiation does not stop the gas flow to the gas burners through the thermocouple, but rather keeps the gas burners burning even though the guard flame has gone out.
  • Flame ignition and monitoring devices are becoming increasingly important in the field of gas appliances. This is partly due to the progressive use of natural gas and gas obtained from coal liquefaction, and partly from the increasing need to protect consumers from the dangers of unburned gases. This gives rise to the search for solutions which enable the pilot lights to be monitored more completely, more reliably and more reliably, but at the same time more cheaply, both when they go out and when there is a lack of oxygen and the incomplete combustion caused thereby.
  • the deflectors used in the known flame ignition and monitoring devices consist of metal, in particular steel. Such deflectors, however, have a detrimental effect on the ignition and securing, mainly on the lack of oxygen protection.
  • the metallic deflectors heat up due to the flame contact. This heat reaches the holder and the nozzle through heat conduction, which changes the gas flow cross-section and requires readjustment, usually via a bimetal-controlled slide, to adapt to the changed conditions.
  • the object of the invention is to improve a flame ignition and monitoring device of the type mentioned in such a way that a deflector made of ceramic material works as an oxygen deficiency detector.
  • the pilot flame nozzle is directed at the underside of a deflector made of refractory ceramic material and the underside forms an impact surface, of which at least one curved upwardly inclined discharge trough for the pilot lights and at least one approximately horizontally running flow trough for the branch the wax flame directed towards the thermocouple.
  • the inventive design of the flame ignition and monitoring device with a ceramic deflector prevents the nozzle cross section of the pilot flame nozzle from changing and having to be readjusted.
  • ceramic material is more durable, oxidizes and does not charr, so that a flame ignition and monitoring device equipped according to the invention with a ceramic deflector has a longer service life. So far, the durability of the entire ignition and monitoring device has been determined by the lifespan of the deflector.
  • the ignition gas flowing in the curved upward sloping discharge troughs also forms a stable flame when the gas supply quantity is reduced.
  • the flame in the approximately horizontal flow channel or trough extinguishes very quickly when there is a lack of oxygen, so that the gas supply is stopped by the cooling thermocouple. Since the ceramic material of the deflector can be shaped very well, all possible shapes of flow troughs or channels can be provided.
  • guide channels for the pilot flame partial flows flowing out of the deflector in different directions are shaped in such a way that the partial stream directed at the thermocouple as a guard flame is so sensitive to the CO z content of the pilot flame gas that it is so sensitive the flame no longer heats the thermocouple if there is insufficient oxygen, min at least another partial flow as the pilot flame but produces a stable flame that continues to burn.
  • thermocouple If there is a lack of oxygen, the flame that heats the thermocouple, which is fed by a partial flow of the flame ignition gas, extinguishes or breaks off. The cooling thermocouple then switches off the gas supply to the burners. In the meantime, the gas in the supply line to the flame ignition nozzle continues to burn in a stable flame, which is fed by one or more other partial flows, until all the gas has been burned. This prevents a deflagration from occurring when the ignition is re-ignited.
  • the deflector should be shaped such that pilot and watch flames emerge at different levels, it being preferred that the pilot flame directed at the thermocouple emerges from the deflector at a lower level than the pilot flames. This ensures that the thermocouple is protected by heat radiation from the burner gases and only responds to the partial flow of the watch flame gas directed at it, so that it is ensured that the gas supply is interrupted both when the watch flame goes out and when there is a lack of oxygen.
  • the ignition electrode should be installed in the deflector.
  • the arrangement should in particular be such that the ignition spark is generated inside the deflector. While in the known devices the electrode tip is constantly exposed to the flame during operation, it wears out due to oxidation and is contaminated by carbonization, in the arrangement according to the invention the electrode is insulated in the deflector, protected against heat radiation and protected against contamination. Since the ceramic material of the deflector has electrically insulating properties, there is no need for special insulation for the electrode tip. By eliminating the spark plug insulation, a further cost advantage can be achieved.
  • the deflector should be installed in a holder made of a material with low thermal conductivity, and shields should be attached to the holder to protect the ignition flame nozzle against heat radiation.
  • These shields can be produced by punched out and unfolded sections of the side walls of the holder.
  • thermocouple 6 and the ignition electrode 7 are mounted on a mounting plate 1 by means of a spring 8.
  • the deflector 2 directs the gases flowing out of the nozzle 4 through a channel 14 in the direction of the thermocouple 6 and the ignition electrode 7 in the horizontal direction.
  • the gases are ignited by the ignition electrode 7.
  • the gas supply is maintained. If the flame tears off or goes out, the thermocouple 6 cools down and thermoelectrically switches off the gas supply, which results in the ignition and gas burner coming to a standstill.
  • the flame ignition and monitoring device according to the invention shown in FIGS. 3 to 6 has a deflector.
  • “Deflector” is understood below to mean a hood, cap or the like above the outlet opening of the pilot flame nozzle, through which the pilot flame gases are deflected in a desired direction or directions.
  • the deflector 2 made of ceramic material is designed with flow channels or troughs in such a way that at least two partial gas flows are formed.
  • the gas jet emerging from the pilot flame nozzle 5 strikes on a baffle 9 on the underside of the deflector 2 and then divides into three partial flows, two of which as pilot lights 10, 10a and 11, 11a in the direction of the arrows above curved obliquely upwardly directed troughs 15 upwards to ignite the gas burners 12 , 12a escaping gases flow and the third partial stream flows as a flame 13 in the direction of the arrow in an approximately horizontal direction through the trough 14 onto the thermocouple 6 (FIGS. 3 and 5).
  • the spark plug 7 used in the deflector 2 By means of the spark plug 7 used in the deflector 2, the pilot flame gases are ignited when they strike the impact surface 9 (FIGS. 5 and 6).
  • the deflector 2 is inserted in a holder 3 made of sheet metal, from the side walls of which radiation shields 18, 19 are notched to protect the nozzle 5, which form an opening 20 for the passage of the ignition gases.
  • the watch flame 13 rises more and more until the thermocouple 6 is no longer heated sufficiently and the safety valve is actuated to close the gas supply.
  • the pilot lights 10, 10a burn; 11, 11a independently because they have greater flame stability due to the selected channel shape and keep the flames of the burners 12, 12a awake. These flames thus reduce the formation of carbon oxide, which usually forms when the flames are raised, and consume all remaining traces of gas in the supply pipes and burners during the closing phase.

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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)
  • Developing Agents For Electrophotography (AREA)

Claims (7)

1. Dispositif d'allumage et de surveillance de flammes avec une veilleuse d'allumage dirigée sur le brûleur et une veilleuse disposée plus profondément et dirigée sur un thermocouple, caractérisé par le fait que la buse de veilleuse d'allumage (5) est dirigée sur la face inférieure d'un déflecteur (2) constitué d'un matériau céramique réfractaire et cette face inférieure constitue une surface d'impact (9) de laquelle bifurquent au moins une cuvette déviatrice (15) bombée inclinée vers le haut pour les flammes d'allumage (10, 11) et au moins une cuvette d'écoulement (14) adjacente s'écoulant horizontalement pour la veilleuse (13) dirigée sur le thermocouple (6).
2. Dispositif selon la revendication 1, caractérisé par le fait que des canaux de guidage (14, 15) pour les courants partiels de veilleuses d'allumage sortant du déflecteur (2) dans plusieurs directions sont formés dans ledit déflecteur (2) de telle manière que le courant partiel formant veilleuse (13) dirigé sur le thermocouple (6) est sensible à la teneur en cO2 du gaz de la veilleuse d'allumage de sorte que la flamme, en cas d'insuffisance d'oxygène, ne chauffe plus le thermocouple (6), au moins un autre courant partiel formant veilleuse d'allumage (10, 11) assurant cependant une flamme continuant à brûler de manière stable.
3. Dispositif selon la revendication 2, caractérisé par le fait que le déflecteur (2) a une forme telle que les veilleuses d'allumage et les veilleuses (10, 11; 13) sortent selon plusieurs plans.
4. Dispositif selon la revendication 3, caractérisé par le fait que la veilleuse (13) dirigée sur le thermocouple (6) sort du déflecteur (2) selon un plan situé plus bas que les veilleuses d'allumage (10, 11).
5. Dispositif selon l'une des revendications 1 à 4, caractérisé par le fait que l'électrode d'allumage (7) est montée dans le déflecteur (2).
6. Dispositif selon la revendication 5, caractérisé par le fait que la bougie d'allumage se forme à l'intérieur du déflecteur (2).
7. Dispositif selon l'une des revendications 1 à 6, caractérisé par le fait que le déflecteur (2) est monté dans un support (3) en un matériau ayant une conductibilité thermique inférieure et des boucliers (18, 19) pour la protection de la buse de veilleuse d'allumage (5) sont fixés sur le support (3).
EP79103850A 1979-10-08 1979-10-08 Dispositif d'allumage et de contrôle d'une flamme Expired EP0026792B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT79103850T ATE4744T1 (de) 1979-10-08 1979-10-08 Flammenzuend- und ueberwachungsvorrichtung.
EP79103850A EP0026792B1 (fr) 1979-10-08 1979-10-08 Dispositif d'allumage et de contrôle d'une flamme
DE7979103850T DE2966194D1 (en) 1979-10-08 1979-10-08 Flame ignition and control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP79103850A EP0026792B1 (fr) 1979-10-08 1979-10-08 Dispositif d'allumage et de contrôle d'une flamme

Publications (2)

Publication Number Publication Date
EP0026792A1 EP0026792A1 (fr) 1981-04-15
EP0026792B1 true EP0026792B1 (fr) 1983-09-21

Family

ID=8186210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79103850A Expired EP0026792B1 (fr) 1979-10-08 1979-10-08 Dispositif d'allumage et de contrôle d'une flamme

Country Status (3)

Country Link
EP (1) EP0026792B1 (fr)
AT (1) ATE4744T1 (fr)
DE (1) DE2966194D1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6716173A (fr) * 1967-11-28 1969-05-30
NL7206449A (fr) * 1971-05-13 1972-11-15
DE2129516B2 (de) * 1971-06-15 1973-09-27 Joh. Vaillant Kg, 5630 Remscheid Sicherheitseinrichtung für einen Hauptgasbrenner
US4128393A (en) * 1977-02-07 1978-12-05 Humphreys, Hutcheson & Moseley Flame shielding device
FR2412034A1 (fr) * 1977-12-17 1979-07-13 Vaillant Sarl Veilleuse

Also Published As

Publication number Publication date
EP0026792A1 (fr) 1981-04-15
ATE4744T1 (de) 1983-10-15
DE2966194D1 (en) 1983-10-27

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