FR2471552A1 - TWO-GAS CHALUME WITH INTERNAL ANTI-INFLAMMATION DEVICE - Google Patents

Abstract

TWO GAS TORCH EQUIPPED WITH AN INTERNAL ANTI-INFLAMMATION DEVICE. A MEANS OF STOPPING OR DECREASING THE FLOW 37 IS PROVIDED BETWEEN TAP 19 AND INJECTOR 27 AND IS ACTIVATED IN RESPONSE TO AN INTEMPESTIVE RISE IN TEMPERATURE IN REGION R. A PREDETENT CHAMBER 31 IS PROVIDED TO LIMIT THE RISK OF RETURN OF FLAME. IF THE FLAME IS NOT RETURNED, SHUTTER 37 CLOSES AND REMOVES ANY DANGER. APPLICATIONS: TWO GAS TORCH, ESPECIALLY OXYACTETYLENIC TORCH.

Description

The present invention relates to a torch with two

  gas equipped with an internal anti-inflammatory device, this trawl-

  water having a pair of conduits adapted to be connected to two gas sources and having valve means and a mixing chamber fed by the conduits via

  injector means and supplying a lance nozzle.

  Torches of this kind work especially with

  oxygen and acetylene. Such torches are often

  put at risk of flashback. It happens in fact that the flame, instead of going out normally by the spear,

  get inside the device and stay there. this phenomenon

  does not result in a click and then a hiss. Lors-

  that the operator realizes that an abnormal phenomenon is

  product, it immediately closes the torch valve as well as-

  the gas bottles. But it can also happen that the operator is unaware of the whistling and, in this case, the

  parts in. brass. torch can melt in a few seconds

  condes and the very hot burnt gases can go up through the

  gas injectors by depositing lampblack. These two phenomena

  nomenes leading to a localized heating of the part

back of the mixing chamber.

  The seals allow for ten seconds to keep separate the gas and oxygen inflows and, by

  therefore, to maintain the stationary flame front.

  After this time, the joints are no longer effective. Gas and oxygen are allowed to mix upstream of these

  joints and the flame front goes up and down inexorably-

  in. melting the blowtorch.

  It is therefore essential for the security

  in the very first seconds after

return of flame.

  The subject of the present invention is a two-handed torch

  gas, equipped with an internal anti-ignition device

  in the event of abnormal operation, stop

  flame front in the very first seconds that

follow the return of flame.

  According to the invention, a two-gas torch provided with an anti-injection device. flammation includes a pair of ducts adapted to be connected to two gas sources and having

2 471552

  faucet means and a mixing chamber fed by the conduits via injector means and feeding a lance nozzle, and is characterized in that the anti-ignition device. internal comprises a means of safety, stopping or reducing flow, arranged between the valve means and the injector means and associated with at least one of the two gases, said safety means being made active- in response to a rise, untimely

  temperature and / or pressure in a predetermined region.

  born slightly in. downstream of the injector means.

  With this arrangement, if an abnormal phenomenon of flashback occurs, the stop or decrease device. flow occurs and prevents propagation. from the flame front to the back and in. particularly to one of the supply ducts, especially the supply duct. in. oxygen. At the same time, since

  supply duct. in oxygen no longer feeds the in.jec-

  oxygen, the proportion of the oxygen and gas mixture

  fuel is modified, which translates into the former

  tinction, flame. From then on, the hot region will cool

  said and allows the reopening of the flow stop means. Therefore the proper proportion for combustion. between the oxygen and the fuel gas is restored and the torch is ready to be reignited in a normal manner at

* 25 spear.

  According to another characteristic, the security means

  preferably consists of a shutter having a seat member and a closure member which are normally spaced from each other to allow feeding of an injector by one of the conduits but one of which approximates the other by dilation effect. thermal, in response to an elevation

  untimely temperature in said predetermined region

  born. According to yet another feature, the shutter seat member is disposed at the front of a torch handle while the shutter closure member

  is disposed at the rear of a torch lance, said lan

  it being abutted longitudinally on the front end of a sleeve which surrounds, spaced, the rear part of the lance and which is itself abutted longitudinally by its. rear end on the handle, such that in. case

  inadvertent rise in temperature in said region

  predetermined position located at the rear of the lance, this rear part of the lance expands more than said sleeve and

  causes the closing element to be brought closer to the

said seat element.

  A compressible means, preferably a helical spring

  ideal especially with flat turns, is advantageously interposed

  between the rear end of the socket and the handle for

  put on the back part of the spear to continue to

  later without damage, even after the closure element

  the obroder has come into application on the seat element.

  In addition, the torch according to the invention is characterized

  The fact that a chamber with increasing section in one or more stages reduces the risk of flashback. This chamber of predétente is disposed between one of the injectors and the zone by which the other injector is

  connected to the mixing chamber.

  An embodiment of the invention is hereinafter described

  by way of example with reference to the accompanying drawings in which:

  FIG. 1 is an overview of a torch

  the invention .; Figure 2 is a view in section on a larger scale of the nozzle, along the line II-II of Figure 1; FIG. 3 is an enlarged view of the rear portion of the lance and the front portion of the

  handle and shows the safety device in position

  during normal operation;

  FIG. 4 is a view similar to a portion of the

  3 but in which the safety device is closed

  in response to a rise, untimely temperature.

  In the embodiment shown in FIGS.

  4, a torch according to the invention (Figure 1) comprises a.

  handle 10 and a spear he that is attached to this handle 10 by

a threaded ring 12.

  The handle 10 comprises (FIGS. 1 and 3) a pair of conduits 13 and 14 adapted to be connected to two gas sources.

and 16.

  More particularly, conduit 13 is one. leads

  oxygen connected by a hose 17 to a bottle of oxy-

  gene 15 while the conduit 14 is one. acetylene duct connected by a flexible hose 18 to an acetylene cylinder 16. The ducts 13 and 14 comprise faucet means

  generally referred to as 19. These faucet means 19 comprise

  more particularly, a.button 20 for the adjustment of the oxygen and acetylene total flow and a key 21 for dosing

  the proportion of oxygen and acetylene in the mixture.

  We see in 13A and 14A the parts of the conduits 13 and

  14 which are disposed downstream of the tap 19 and which are

  located at the front end 22 of the handle 10. This end

  mité 22 forms a threaded connection 23 for the ring 12.

  The spear 11 ends with one. spout 24 (Figure 2) and

  carries a bent tube 25 integral with a rear part or em-

base 26.

  This rear portion 26 of the lance 11 comprises, on the one hand, an axial injector 27 for oxygen and one or more lateral injectors 28 for acetylene. The two injectors 27 and 28 are connected to a mixing chamber 29, which

  is itself connected by a divergent 30 to the lance tube 25.

  We see in 31 a relaxation room of cross-section

  health in. one or more bearings (two bearings in the example shown in Figure 3). This room of preetente 31 is

  arranged between the oxygen injector 27 and the zone 32 by

  which the acetylene injectors 28 are connected to lacham-

mixture 29.

  This chamber of pre-sentence has the effect of limiting

the risks of re-entry.

  We see in. 33 and in. 34 seals that are

  disposed between the rear portion 26 of the lance 11 and the man-

  10 and which are distributed on either side of the injectors 28.

  As seen in Figure 3, the end 13A duck

  duct 13 terminates in a chamber 35 which is defined in the connector 22 of the handle around the rear end 26 of the

  lance 11 and which is limited by the seals 34.

  This chamber 35 communicates with the oxygen injector 27.

  The front end 14A of the acetylene duct 14 results in

  similarly in a room 36 which is

  swung into the end of the fitting 22 of the handle 10 and which is

  defined between the seals 33 and 34 in communi-

  as for the acetylene injector 28.

  The two gases, oxygen and acetylene, respectively

  two bottles 15 and 16 pass through the pipes 17

  and 18 in ducts 13 and 14 then in the means of rotation

  binet 19 and pass through the ends 13A and 14A of the con-

  13 and 14 in rooms 35 and 36. Then they pass,

  for oxygen, in the injector 27 and the chamber of

  tent 31, and, for acetylene, injectors 28 in

  the mixing chamber 29. The gas mixture crosses the

  vergent 30, passes in the tube 25 and reaches the nozzle 24 o the mixture forms a flame F.

  It may happen that the flame F accidentally

  inside the torch and, in order to avoid the

  such an untimely combustion, the blowtorch

  two gases according to the invention is provided with an

internal inflammation.

  This internal anti-inflammation device has a

  security means forming a stop or decrease means.

  the gas flow. The security means, designated in its. in-

  37 appears, is disposed between the valve means 19 and the injector means 27 and 28 and is associated with at least one of the two gases, namely in the example shown, 1 'oxygen. This security means is made active in response to an inadvertent rise in temperature and / or pressure. in a predetermined region R located slightly

  downstream of the injector means 27 and 28. More particularly

  this predetermined region o is detected as a

  the temperature is located in the area

rear tie 26 of the spear 11.

  In the example shown, the means. security 37

  is a shutter having a. seat element 38 and one. ele-

  39. These two elements are normally

  paced from one another to allow feeding. a. of the

  injectors, namely injector 27 in the example shown in FIG.

  by one. ducts, namely the oxygen duct 13.

  The closure member 39 is adapted to move closer to the

  ge 37 by the effect of thermal expansion of the part

  rear 26 of the spear 11, in. response to an elevation intem-

  temperature of the predetermined region R. More particularly, the seat 38 of the shutter 37 is disposed at the front of the handle 10, while the closure member 39 of the shutter 37 is arranged at the rear of the spear 11-. As seen in Figure 3, the lance is stopped longitudinally in. 40 on the front end 41 of a sleeve 42. This sleeve 42, surrounds, spaced, the rear portion 26 of the lance 11. The sleeve 42 is, she

  same, abutting longitudinally at 43 by its rear end

  Re 44 on the connection 23 of the handle 10. As seen in Figure 3, the stop 40 is provided downstream of the region. R and

noticeably far from it.

  The ring 12 for mounting the lance 11 on the fitting

  23 is screwed in. 45 on this connection 23 up to longitudinal stop

dinal in 46.

  A helical spring 47, with flat turns, is housed in the ring 12 around the sleeve 42 and is applied by one of its ends 48 to the ring 12 and by its. other

end 49 on the socket 42.

  The spring 47 has a preponderant prestressing on the passive resistances of the seals 33 and 34 but low enough to avoid an irreversible settling of the base 26 in case

overheating.

  In case of inadvertent rise in the temperature of the region R, the rear portion 26 of the lance 11 expands more than the sleeve 42, which causes the approximation

  of the closing element 39 of the seat 38 of the shutter 37.

  it will be appreciated that the coil spring 47 interposed between

  the rear end 49 of the sleeve 42 and the anterior end

  48 of the ring 12 integral with the handle 10, allows the rear portion 26 of the lance to continue to expand even - after the closure member 39 of the shutter 37 is

  come (Figure 4) in. application on the seat 38 of this obtura-

37.

  It will be appreciated that the spring 47 can be removed if

  shutter 37, instead of presenting elements 38, 39,

  metal, has at least one of these two elements

elastically formable.

  fk In normal operation, oxygen and acetylene are

  The bottles 15 and 16 pass through the ducts 13 and 14 and pass through the tap 19, which has been adjusted for a suitable overall flow rate with a proportion also regulated by the key 20, and passes through the injectors 27 and 28. to reach the mixing chamber 29 where the mixture is directed by the divergent 30 in the lance tube 25 and out the spout 24 producing the flame F. It will be appreciated that the pre-release chamber 31 allows a remarkable stability of the flame F outside the

  blowtorch. It will also be understood that in normal operation

  badly and even if the work is intensive, the different parts

  these, including the back part 26 of the spear and the socket

  42 are all at the same temperature so that the obtura-

  37 is open since the rear part 26 of the lance

  It expands in the same way as the sleeve 42.

  If it accidentally occurs a flashback, the flame will first stay in the rear part 26 of the lance in the vicinity of the divergent 30. There then occurs a

  whistle that warns the operator and he is quick to

  ra to close the tap 29 and preferably also the

dies 15 and 16.

  But if the operator does not act in this way, the joints 33 and 34 are quickly put out of service and the flame front which develops in the vicinity of the divergent 30 does not

  not slow to go up in the sleeve 10 by melting it.

  Thanks to the invention, this danger is eliminated by the

  the rear part 26 of the lance 11 is

  in the first few seconds, at a higher temperature.

  the bushing 42 since it surrounds

  paced the back of the spear 11.

  This rear portion 26 expands so backwards

  which tends to close in 38,39 the safety shutter 37.

  Therefore, the arrival of oxygen to the injector 27 tends

  to close. The proportion of the mixture is changed and that

  it is no longer combustible, which causes the extinction of

the flame.

2 4 7 15 5 2

  It will be appreciated that this fully automatic remedy intervenes in the very first seconds following the inadvertent phenomenon of flashback and thus avoids irremediable consequences that could occur at a later date.

  after about ten seconds after the appearance of the

flame.

  When the flame inside the back part

  26 of the lance has been extinguished thanks to the safety

  according to the invention. and as just said, the

  rear portion 26 of the spear 11 cools, which provokes

  the reopening of the shutter 37. The proper proportion

  the combustion of the fuel mixture is then

  and the torch may be ready to be turned on again

normal with the spearhead 24.

  We appreciate the particularly simple construction

  and effective torch according to the invention provided with the provision

internal flame retardant.

  In the foregoing, the safety device is ac-

  in response to an untimely temperature in the

  gion R, but it can also be operated in. response to untimely pressure in this region R. In this case, it may consist of a valve having the same location as the shutter 37 and slaved to the differential pressure of

  on both sides of this flap. If the operation is normal

  incorrectly, the flap is open under the effect of

  riveted gas at 13A or 14A greater than the pressure of the

  mixing chamber 29. In the event of a return of flame, the

  sion at 29 becomes dominant and the flap closes.

  Well. understood, the invention is not limited to the form

  described and illustrated, but embraces all

  in the context of the claims. In particular, the

  safety device may be provided, preferably in tamper-proof form, in a casing which is interposed between the handle and the lance and whose adjustment is not tributary

  the degree of screwing of a ring such as the ring 12.

Claims (8)

  1) two-gas torch equipped with an anti-inflammatory device   internal arrangement, said torch having a pair of conduits adapted to be connected to two gas sources and having valve means, a mixing chamber fed by the conduits via injector means and feeding a spout; lance, said torch characterized in that the internal anti-inflammatory device comprises a safety means, stopping or reducing flow, arranged between the valve means and the injector means and associated with at least one of both gases, said safety means being rendered active in response to an inadvertent rise in   temperature and / or pressure in a predetermined region.   born slightly downstream of the injector means.   2) Torch according to claim 1, characterized in that said security means consists of a shutter having a seat member and a closure member which are   normally spaced apart from one another to   injection of an injector by one of the conduits but one of which approaches the other by thermal expansion effect in response to an inadvertent rise in temperature   in said predetermined region, with a view to stopping or   derive the supply of said injector.   3) Torch according to claim 2, comprising a   handle and a lance attached to the front of this sleeve,   in that the seat element of the shutter is arranged to   the front of the handle, while the closing element of the ob-   turner is disposed at the rear of the lance, said lance being longitudinally abutted on the front end of a sleeve which surrounds, spaced apart, the rear portion of the lance which is itself longitudinally abutted by its rear end on the handle, so that   the case of an untimely rise in temperature in the said   predetermined position on the back of the spear, this   the back of the lance expands further than the said   the and causes the approximation of said closure element to said seat member.   4) Torch according to claim 3, characterized in that the longitudinal stop of the lance on the front end 1o of the sleeve is provided downstream of said region   predetermined and significantly away from it.   Torch according to claim 3 or claim 4, characterized in that a compressible means is provided to allow the rear part of the lance to continue.   to expand even after the closing element of the ob-   turateur came in. application on the seat element.   6) Torch according to claim. 5, characterized in   that said compressible means comprises a helical spring   dal interposed between the rear end of the sleeve and the handle.   /) Torch according to claim 6, characterized in   that said coil spring is at flat turns.   8) Torch according to claim 6 or claim   tion. 7, comprising a ring for mounting the lance on the handle, this ring being screwed on the handle until longitudinal stop, characterized in that said spring is housed in said ring around the sleeve and applied by its   ends on the ring and on the socket.   9) Torch according to any one of the claims   6 to 8, characterized in that the spring has a prestressing   preponderant effect on passive resistances of etan joints.   chéité arranged between the rear part of the lance and the handle and distributed on both sides of the injector means,   said prestress being small enough to prevent one. Cup-   irreparable damage to the back of the spear in case of inadvertent dilation.   Torch according to one of the claims   previous, characterized in that a pre-yielding chamber of increasing section in. one or more bearings is arranged   between one of the injectors and the zone through which the other   jector is connected to the mixing chamber.   11) Two-gas torch fitted with an anti-inflammatory device   internally, said torch having a pair of conduits adapted to be connected to two gas sources and having valve means, a mixing chamber fed by the conduits via two injectors and feeding a lance nozzle, said torch characterized in. said internal anti-ignition device comprises a pre-yielding chamber of increasing cross-section in one or more bearings, limiting the risk of flashback, said pre-yielding chamber being arranged between one of the injectors and the zone through which the another injector is connected to the chamber mixture.