EP0040148B1 - Brennerlanze mit Vorrichtung zum Schutz gegen Rückzündung, Gasrückströmung und Bildung gefährlicher Gasgemische - Google Patents

Brennerlanze mit Vorrichtung zum Schutz gegen Rückzündung, Gasrückströmung und Bildung gefährlicher Gasgemische Download PDF

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Publication number
EP0040148B1
EP0040148B1 EP81400738A EP81400738A EP0040148B1 EP 0040148 B1 EP0040148 B1 EP 0040148B1 EP 81400738 A EP81400738 A EP 81400738A EP 81400738 A EP81400738 A EP 81400738A EP 0040148 B1 EP0040148 B1 EP 0040148B1
Authority
EP
European Patent Office
Prior art keywords
gas
torch
intake
combustible gas
valve
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
EP81400738A
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English (en)
French (fr)
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EP0040148A1 (de
Inventor
Philippe Visage
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.)
Cessione Francaise De Terotechnologie Ste
Original Assignee
Ets R DUBE SA
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Filing date
Publication date
Application filed by Ets R DUBE SA filed Critical Ets R DUBE SA
Priority to AT81400738T priority Critical patent/ATE7424T1/de
Publication of EP0040148A1 publication Critical patent/EP0040148A1/de
Application granted granted Critical
Publication of EP0040148B1 publication Critical patent/EP0040148B1/de
Expired legal-status Critical Current

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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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/82—Preventing flashback or blowback
    • F23D14/825—Preventing flashback or blowback using valves

Definitions

  • the present invention relates to the field of torches.
  • It more particularly relates to a new torch comprising a device for protection against interior ignitions, gas return and creation of dangerous gaseous mixtures in particular upstream of said torch.
  • the torches intended to produce a flame are supplied, on the one hand, by a combustible gas and, on the other hand, by an oxidizing gas.
  • the gases exit from a set of orifices called an injector or mixer; they then mix in a conduit called the mixing chamber.
  • the mixture thus formed ignites at the outlet of the lance disposed on the torch through an orifice called a nozzle or nozzle.
  • the safety device generally consists of a non-return valve and a flame smothering device. It is necessary to have two devices, each of them being arranged, on the one hand, on the fuel gas circuit and, on the other hand, on the oxidant gas circuit.
  • valve on the fuel or oxidant gas supply circuit can be the source of variations in gas flow rate incompatible with the low value of the operating pressure appropriate to the usual working conditions and requiring setting changes.
  • the valve itself and more particularly its position can constitute a potential factor of incidents or accidents by flashback.
  • the safety of its operation depends on the distance at which it is mounted relative to the torch, but also on the inclination given to it by the user during work.
  • the reliability of the valve may be compromised in the short term due to fouling or deterioration of the internal mechanism.
  • this document relates to an oxyacetylene lighting torch and not to a welding torch.
  • the device FR-A No. 527827 leaves a volume of such a size inside the torch or of the torch, that an explosion can undoubtedly occur inside it. of the blowtorch.
  • the desired goal that is to say safety for the operator, is therefore in no way achieved by such a device.
  • This statement of non-satisfaction does not come from the licensee, but from independent organizations such as the National Research and Safety Institute for the Prevention of Accidents at Work and Occupational Diseases (INRS), as well as several funds insurance and sickness, which unambiguously meant that it was necessary to find a device making it possible to reduce the unprotected interior volume of the torch under conditions such that accidents would either be eliminated or considerably reduced.
  • Patents FR-A Nos . 1336491, 1480261 and CH-A No. 472632 disclose the possibility of using sintered sintering pipes or similar devices as a flame smothering element.
  • porous filter cylinder is disposed inside a sealed outer casing and itself serves as a housing for a check valve intended to be enclosed therein.
  • a filter element is provided on each of the gas circuits.
  • the device according to FR-A No. 1336491 also leaves a large volume between the tip of the torch and the first selected elements (valve and sintered), volume more than sufficient for accidents occur by return of the oxidant gas in the fuel gas circuit.
  • the oxidizing and combustible gases are treated in a perfectly identical or symmetrical manner which, obviously, is not the case of the present invention where the structure of the torch and the means put in place confirm that these gases are not considered in the same way.
  • the flame arrestor device which consists of a pellet of metallic or ceramic porous material, tually obtained by sintering, is located as close as possible to the fusion nozzle through which the flame shoots out in the open air.
  • the sinter is located downstream of the mixing chamber since the gaseous mixture is not, of course, made at the outlet of the torch.
  • the CH-A patent? 472632 uses two and not a sinter, each of the devices being located on the gas inlet.
  • the object of the invention is precisely to provide a solution to the problem previously posed and relates to a new torch comprising a device for protection against interior ignitions and gas return.
  • the torch according to the invention comprises means for the admission of a combustible gas and means for the admission of an oxidizing gas, the pressure of this gas being greater than that of the combustible gas, means for adjusting the flow rate of these gases disposed on said intake means; means for mixing said gases; means for the outlet of said gas mixture to the nozzle or the nozzle of said torch and two non-return valves disposed respectively in each of the means for the admission of gas.
  • the torch is characterized in that the non-return valve which is arranged in the means for the admission of combustible gas is placed downstream of the corresponding adjustment means, and in that a means, such as a metallic sinter, for suffocating a flame is disposed in the means for admitting the combustible gas, between the non-return valve and the mixing means, in the immediate vicinity of the latter.
  • a means such as a metallic sinter
  • the non-return valve located in the means for admitting the combustible gas is preferably arranged in the means for adjusting the flow rate of this gas.
  • the means for smothering a flame is generally constituted by a metallic frit, that is to say by a porous cylinder of a sintered metal, therefore a stainless steel which acts as a molecular sieve to absorb the deflagration and smother the flame.
  • the means for adjusting the flow rate of oxidizing gas are constituted by a device called a grooved needle of the type described in the patents FR N os 592979, filed on April 18, 1924 in the name of R. Dube and P. Guerchin, and 609335, filed April 23, 1925.
  • this device makes it possible to use only a metallic sinter, unlike the two which were required previously, since in fact two devices were necessary, that is to say one per gas circuit.
  • the device according to the invention also has a much shorter reaction time than the gas or flame return phenomenon.
  • the device presently described makes it possible to avoid any return of the oxidizing gas in the fuel gas circuit.
  • the torch according to the invention is much less sensitive to the inclination to which it is subjected by its user, in course of use.
  • This torch 1 comprises a means for the admission 2 of a combustible gas and a means for the admission 3 of an oxidizing gas.
  • Devices for adjusting the flow rate 4 and 5 are disposed respectively on each of the intake means and allow the user to adjust the gas supply as a function of the aims pursued.
  • the pressure of the oxidizing gas is generally higher than the pressure of the combustible gas.
  • a vacuum is created which makes it possible to suck the combustible gas during normal operation.
  • the fuel gas / oxidizing gas gas mixture can in principle only exist downstream of the so-called venturi systems 12.
  • the mixture of the gas is therefore ensured at 6 and is evacuated by means 7 such as a lance towards the nozzle or nozzle 8 of the torch and the ignition is carried out.
  • the safety device according to the invention consists, on the one hand, of a non-return valve 9 arranged in the gas inlet means fuel 2 and preferably in the adjusting device 4.
  • a non-return valve 10 is placed in the intake means for the oxidizing gas 3.
  • a flame smothering device such as a frit 11 is located downstream of the non-return valve 9 substantially at the level of the gas mixing zone 6 slightly upstream with respect thereto.
  • the nozzle or the nozzle 8 of the torch can become blocked due to fortuitous circumstances, it results in a discharge of the oxidizing gas in the fuel gas line.
  • the non-return valve 9 is closed at rest and only opens under the combined action of the pressure of the fuel gas and the depression due to the suction created by the so-called venturi system. 12 caused by the flow of oxidant gas.
  • This device will therefore close if it is subjected to a back pressure due either to a discharge of the oxidizing gas, or to an explosion of the mixture in the lance of the torch.
  • the flame smothering or sintered element 11, placed downstream of the valve 9, will smother a possible flame, caused by an ignition of the lance mixture.
  • the action of the frit 11 exerts an influence on the valve 9 since the smothering of the possible flame accentuates the closing of said valve 9, thus preventing any risk of gas introduction.
  • oxidizer in the fuel gas circuit both during use of the torch and between two uses.
  • valve 10 disposed in the intake means for the oxidant gas avoids the possible access of the combustible gas in the line of the oxidant gas 3. This case, in fact, would be possible when the fuel gas taps and oxidizer are open, when the supply of combustible gas is open while the supply of oxidant gas is closed, and when the nozzle or nozzle of the torch is obstructed or partially obstructed.
  • the torches according to the invention can be of any type, such as in particular those used with the usual gases in this field, such as oxygen, acetylene, propane, tetrene or any other gas.
  • non-return valves can also be of the conventional type and will simply have to be adapted to the dimensions of the torches used.
  • valve 9 is closed at rest and does not s 'opens only under the combined action of the fuel gas pressure and the pressure due to the suction created by the venturi system 12 caused by the flow of oxidant gas.
  • the flow adjustment means 5 are constituted by a grooved needle device of the type described in the aforementioned patents FR Nos . 592979 and 609335, to which those skilled in the art can refer.
  • the device placed in the immediate vicinity of the valve 10 and downstream of it, also plays the role of flame smother in a manner substantially similar to the sinter 11 and makes it possible to avoid rare, but possible, return of combustible gas in the oxidant gas circuit (plugged torch, oxidizer gas supply closed, fuel gas supply and valve open).
  • Non-return devices such as frits will also be chosen from existing models. As a rule, stainless steel frits are used.
  • a device of the conventional type was tested with regard to the influence of the inclination of the torch on the flow rates.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Lighters Containing Fuel (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Claims (3)

1. Brennerlanze (1), bestehend aus Mitteln (2) für die Zufuhr eines brennbaren Gases und aus Mittel (3) für die Zufuhr eines Sauerstoffträgergases, wobei der Druck dieses Gases höher ist als der des brennbaren Gases, aus Mitteln (4, 5) zur Regelung der Menge dieser den erwähnten Zufuhrmitteln zur Verfügung gestellten Gase, aus Mitteln (6), um die Mischung der erwähnten Gase sicherzustellen, aus Mitteln (7) für den Auslass der erwähnten Gasmischung bis zur Mündung oder Düse (8) der Brennerlanze und aus zwei Rückschlagklappen (9, 10), die jeweils in jedem der Mittel für die Gaszufuhr angeordnet sind, dadurch gekennzeichnet, dass die Rückschlagklappe (9), die in den Mitteln für die Zufuhr des brennbaren Gases angeordnet ist, strömungsmässig hinter dem zugehörigen Regelmittel (4) liegt und dass ein Mittel (11), wie eine metallische Fritte, zum Löschen einer Flamme in dem Mittel für die Zufuhr des brennbaren Gases angeordnet ist, und zwar zwischen der Rückschlagklappe (9) und den Mischmitteln in unmittelbarer Nähe der letzteren.
2. Brennerlanze nach Anspruch 1, dadurch gekennzeichnet, dass die erwähnte Rückschlagklappe (9) in den Mitteln (4) zur Mengenregelung angeordnet ist.
3. Brennerlanze nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die erwähnten Mittel (5) zur Regelung des Sauerstoffträgergases durch eine Vorrichtung mit einer kanellierten Nadel gebildet sind.
EP81400738A 1980-05-08 1981-05-08 Brennerlanze mit Vorrichtung zum Schutz gegen Rückzündung, Gasrückströmung und Bildung gefährlicher Gasgemische Expired EP0040148B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400738T ATE7424T1 (de) 1980-05-08 1981-05-08 Brennerlanze mit vorrichtung zum schutz gegen rueckzuendung, gasrueckstroemung und bildung gefaehrlicher gasgemische.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8010326 1980-05-08
FR8010326A FR2482259B1 (fr) 1980-05-08 1980-05-08 Chalumeau avec dispositif de protection contre les allumages interieurs, retour de gaz et creations de melanges gazeux dangereux

Publications (2)

Publication Number Publication Date
EP0040148A1 EP0040148A1 (de) 1981-11-18
EP0040148B1 true EP0040148B1 (de) 1984-05-09

Family

ID=9241772

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400738A Expired EP0040148B1 (de) 1980-05-08 1981-05-08 Brennerlanze mit Vorrichtung zum Schutz gegen Rückzündung, Gasrückströmung und Bildung gefährlicher Gasgemische

Country Status (4)

Country Link
EP (1) EP0040148B1 (de)
AT (1) ATE7424T1 (de)
DE (1) DE3163468D1 (de)
FR (1) FR2482259B1 (de)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR344531A (fr) * 1904-07-02 1904-11-07 Paul Charles Dumesml Chalumeau à gaz
FR527827A (fr) * 1920-12-01 1921-10-31 Ernest Preston Prator Torche à l'oxy-acétylène
FR592979A (fr) * 1924-04-18 1925-08-13 Perfectionnements aux chalumeaux oxy-acétyléniques ou analogues
FR609335A (fr) * 1925-04-23 1926-08-12 Perfectionnements aux chalumeaux oxyacétyléniques ou analogues
FR756283A (fr) * 1932-07-13 1933-12-07 Linde Air Prod Co Perfectionnements aux chalumeaux pour la soudure
US2611424A (en) * 1948-07-17 1952-09-23 Smith Welding Equipment Corp Pressure-operated antibackflow device for cutting torches
FR1336491A (fr) * 1962-09-19 1963-08-30 Système de sécurité pour chalumeaux et appareils de soudure autogene
FR1453621A (fr) * 1965-11-10 1966-06-03 Messer Griesheim Gmbh Chalumeau à injection, muni d'insertions interchangeables pour la soudure ou le coupage
FR1480261A (fr) * 1966-03-29 1967-05-12 Perfectionnement aux dispositifs anti-retour de flamme pour installation de soudure et de coupe autogène et pour chalumeau de pistolet de métallisation
CH472632A (de) * 1967-11-04 1969-05-15 Mueller Max Flammensperre in der Sauerstoff- und in der Brenngaszuleitung eines Schweiss- oder Schneidbrenners
FR2235622A5 (en) * 1973-06-29 1975-01-24 Atlantique Chantiers Oxy-acetylene burner for flame cutting of metals - with spring-loaded non-return valve on oxygen injector

Also Published As

Publication number Publication date
DE3163468D1 (en) 1984-06-14
FR2482259A1 (fr) 1981-11-13
EP0040148A1 (de) 1981-11-18
FR2482259B1 (fr) 1986-11-21
ATE7424T1 (de) 1984-05-15

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