EP0040148A1 - 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

Info

Publication number: EP0040148A1
Authority: EP; European Patent Office
Prior art keywords: gas; torch; intake; valve; flame
Prior art date: 1980-05-08
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.): Granted

Application number

EP81400738A

Other languages

English (en)

French (fr)

Other versions

EP0040148B1 (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

Dube SA Ets R

Ets R DUBE SA

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.)

1980-05-08

Filing date

1981-05-08

Publication date

1981-11-18

1981-05-08 Application filed by Dube SA Ets R, Ets R DUBE SA filed Critical Dube SA Ets R

1981-05-08 Priority to AT81400738T priority Critical patent/ATE7424T1/de

1981-11-18 Publication of EP0040148A1 publication Critical patent/EP0040148A1/de

1984-05-09 Application granted granted Critical

1984-05-09 Publication of EP0040148B1 publication Critical patent/EP0040148B1/de

Status Expired legal-status Critical Current

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Images

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
- 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 “injector or mixer”; they then mix in a conduit called the mixing chamber.
injector or mixer a set of orifices called "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 oxidant or fuel gas supply circuit can be the source of variations in gas flow incompatible with the low value of the operating pressure appropriate to the usual working conditions and requiring setting changes.
the valve itself can be a potential factor in flashback incidents or accidents.
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 can be compromised in the short term due to fouling or deterioration of the internal mechanism.
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 comprises means for the admission of a combustible gas and means for the admission of an oxidizing gas, the pressure of the latter gas being lower than that of the combustible gases, means for adjusting the flow rate of these gases. disposed on said intake means, means for ensuring the mixing of said gas gases means for the outlet of said gas mixture to the nozzle or nozzle of said torch.
This torch is characterized in that it comprises a non-return valve disposed on each of the gas inlet means, as well as a means for smothering a flame, disposed between said non-return valves and the means ensuring the mixing of said gas.
the valve located on the fuel gas supply circuit 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 sinter, that is to say 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 known as a "fluted needle" of the type described in patent FR No. 592,979 filed on April 18, 1924 in the name by R. DUBE and P.GUERCHIN and n ° 609.335 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 phenomenon of gas or flame return.
the device presently described makes it possible to prevent 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 phenomenon will be highlighted during the comparative tests attached to this description.
This torch 1 comprises an inlet means 2 for a combustible gas and an inlet means 3 for an oxidizing gas.
Flow adjustment devices 4 and 5 are disposed respectively on each of the intake means and allow the user to adjust the gas supply according to the aims pursued.
the pressure of the oxidizing gas is generally higher than the pressure of the combustible gas.
i1 creates a vacuum which makes it possible to suck the combustible gas in normal operation.
the gas mixture fuel gas / oxidant gas can in principle only exist downstream of the so-called venturi systems 12.
the mixing of the gas is therefore ensured at 6 and is evacuated by means 7 such as a lance towards the beak or nozzle 8 of the torch and ignition is carried out.
the safety device consists on the one hand of a non-return valve 9 arranged on the fuel gas circuit 2 and preferably, substantially at the level of the adjustment means 4, for example a few mm (2 5 mm, for example) from these.
a non-return valve 10 is placed on the oxidant gas circuit 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 non-return valve 9 is closed at rest, and opens only under the combined action of the pressure of the combustible gas and the vacuum due to the suction created by the said system. venturi 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 mixture of the launch.
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 introduction of the gas. oxidizer in the fuel gas circuit, both during use of the torch and between two uses.
valve 10 disposed in the oxidant gas circuit eliminates the possible access of combustible gas in the oxidant gas line 3. This case in fact would be possible when the fuel and oxidant gas taps are open, the fuel gas supply is open while the combustion gas supply is closed and the torch nozzle or nozzle 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 open only under the combined action of the pressure of the combustible gas and the pressure due to the suction created by the venturi system 12 caused by the flow of oxidizing gas.
the flow adjustment means 5 are constituted by a grooved needle device of the type described in the aforementioned patents FR 592,979 and 609,335, to which a person skilled in the art may 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 (blocked torch, closed oxidant gas inlet, fuel gas inlet 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.

Landscapes

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

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
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
FR8010326		1980-05-08

Publications (2)

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

Citations (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

1980
- 1980-05-08 FR FR8010326A patent/FR2482259B1/fr not_active Expired
1981
- 1981-05-08 AT AT81400738T patent/ATE7424T1/de not_active IP Right Cessation
- 1981-05-08 DE DE8181400738T patent/DE3163468D1/de not_active Expired
- 1981-05-08 EP EP81400738A patent/EP0040148B1/de not_active Expired

Patent Citations (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
FR2482259B1 (fr)	1986-11-21
EP0040148B1 (de)	1984-05-09
ATE7424T1 (de)	1984-05-15

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1981-09-19	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
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1984-01-12	ITF	It: translation for a ep patent filed
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