EP0689008B1 - Fluid flow control device with dual actuation - Google Patents

Description

The present invention relates to the control of flow rate of a fluid, for example a combustible gas, at by means of a needle valve. Generally, such device is understood or integrated into a structure or together, comprising a functional organ allowing dispense or consume the controlled fluid, all forming an apparatus dispensing or consuming said fluid.

By "structure" is meant any set of components or other means, such as chassis or bodywork, completing the control system and the functional organ, and forming with it a complete unit in working order.

In accordance with document FR-A-1 172 860, we have described and proposed a welding torch, allowing consequently to dispense or consume a fluid, in the occurrence of a pressurized combustible gas. The general structure of this device, shown for example at Figure 3, brings together, firstly a tap to needle, secondly an actuator in translation of the needle, in this case a lever, thirdly a burner, constituting the functional organ to dispense or consume the fluid controlled by the needle valve, and fourthly a means of reception and keeping a fuel gas cartridge under pressure, with gas taking means in said cartridge.

• un corps dans lequel est ménagée une chambre dans laquelle débouche un orifice formant siège pour le pointeau, avec un passage amont arrivant par ledit orifice dans ladite chambre, et un passage aval partant de ladite chambre vers l'organe fonctionnel, en l'occurrence le brûleur ;
• un fourreau intermédiaire, monté dans un alésage ménagé sur le corps, de manière mobile uniquement en translation par rapport audit corps, dans l'axe du siège précité ;
• un écrou fermant ledit alésage ;
• un moyen de rappel constitué par un ressort hélicoïdal, coaxial avec ledit fourreau intermédiaire, en appui d'un côté sur le fourreau intermédiaire et de l'autre côté contre l'écrou ;
• un pointeau, coaxial avec le fourreau intermédiaire, comportant une extrémité active coopérant avec le siège, ainsi qu'une extrémité de commande saillante à l'extérieur du corps ; ce pointeau est monté dans le fourreau intermédiaire, dans l'axe du siège, de manière mobile à la fois en translation et en rotation, par vissage ;
• des moyens d'étanchéité du pointeau par rapport à la chambre précitée ;
• et un volant rotatif de commande du robinet, calé en rotation sur le pointeau, disposé coaxialement audit pointeau, accessible à l'extérieur de la structure de l'appareil.

The needle valve itself includes:

• a body in which is formed a chamber into which opens an orifice forming a seat for the needle, with an upstream passage arriving through said orifice in said chamber, and a downstream passage leaving from said chamber towards the functional member, in this case the burner;
• an intermediate sleeve, mounted in a bore formed on the body, movable only in translation relative to said body, in the axis of the aforementioned seat;
• a nut closing said bore;
• a return means constituted by a helical spring, coaxial with said intermediate sleeve, bearing on one side on the intermediate sleeve and on the other side against the nut;
• a needle, coaxial with the intermediate sheath, comprising an active end cooperating with the seat, as well as a control end projecting outside the body; this needle is mounted in the intermediate sleeve, in the axis of the seat, movably both in translation and in rotation, by screwing;
• means for sealing the needle with respect to the aforementioned chamber;
• and a rotary valve control wheel, set in rotation on the needle, arranged coaxially with said needle, accessible outside the structure of the device.

• un élément d'actionnement, constitué par un levier, accessible à l'extérieur de la structure de l'appareil, lié mécaniquement et indirectement à l'extrémité de commande du pointeau, pour déplacer ce dernier en translation par rapport au siège, au moyen du fourreau intermédiaire ;
• un manchon pris entre le volant de commande et l'écrou, formant élément d'appui pour une extrémité de l'organe d'actionnement ou levier ;
• un axe prévu sur le corps, pour former un appui pivotant pour ledit levier ;
• le moyen de rappel entre l'écrou et le fourreau intermédiaire, permettant de rappeler l'extrémité de commande du pointeau, et par conséquent l'extrémité liée du levier précité, dans le sens de la fermeture du robinet.

The actuator in translation of the needle, is generally arranged on the structure of the device, and comprises:

• an actuating element, constituted by a lever, accessible outside the structure of the device, mechanically and indirectly linked to the control end of the needle, to move the latter in translation relative to the seat, by means intermediate sheath;
• a sleeve taken between the control wheel and the nut, forming a support element for one end of the actuating member or lever;
• an axis provided on the body, to form a pivoting support for said lever;
• the return means between the nut and the intermediate sleeve, making it possible to recall the control end of the needle, and consequently the linked end of the aforementioned lever, in the direction of closing the valve.

• en tournant le volant de commande, de manière fine, d'une valeur nulle à une valeur relativement faible ;
• et en agissant sur l'élément d'actionnement, ou levier, de manière grossière, de cette valeur relativement faible à une valeur beaucoup plus importante.

Thanks to the needle valve described above, supplemented by the actuating member in translation of said needle, it is possible to adjust the flow rate of the combustible gas under pressure:

• by turning the control wheel, in a fine manner, from a zero value to a relatively low value;
• and by acting on the actuating element, or lever, roughly, from this relatively low value to a much higher value.

Such functions and results are particularly important for a gas torch, for determine in particular a "pilot" position of the flame, corresponding to the relatively low flow, and a "full flame" position, corresponding to the maximum flow combustible gas.

The needle valve and the actuator functionally linked to it, together present the following disadvantages.

The fully closed position of the valve is obtained by screwing the needle in relation to the sheath intermediate, thanks to the control wheel. This movement screwing causes, firstly the decline of said sheath towards the nut, against the return means, constituted by the helical spring, then the full compression of said spring, with contiguous turns, between the sheath intermediate and nut, and finally the shutter complete with seat opening through active end of the needle, corresponding to the zero value of the flow of the combustible gas.

Conversely, the minimum opening position of the tap is determined in part by the loosening or the decompression of the coil spring, pushing the intermediate sleeve opposite the nut.

• la force de rappel du ressort diminue rapidement dans le temps, ce qui a pour effet de faire évoluer au cours du temps, ou d'une manoeuvre à une autre du levier d'actionnement, la position d'ouverture minimum du robinet ;
• le ressort s'use ou vieillit plus rapidement, ce qui peut entraíner sa rupture prématurée ; une telle rupture est au surplus dangereuse pour l'utilisateur, puisque la position de complète fermeture du robinet dépend de la compression complète du ressort.

As the completely closed position is that which corresponds to the non-use, and therefore to the storage of the torch, the return or spring means is therefore completely compressed most of the time of the useful life of said torch. This has several consequences:

• the return force of the spring decreases rapidly over time, which has the effect of changing over time, or from one operation to another of the actuating lever, the minimum opening position of the valve;
• the spring wears out or ages faster, which can cause it to rupture prematurely; such a break is moreover dangerous for the user, since the position of complete closing of the valve depends on the complete compression of the spring.

The fully closed valve position is obtained after compression of several turns of the spring, and the user therefore does not have the sensation of a frank stop to determine whether it has reached or not, the fully closed tap position.

The object of the present invention is to modify the construction described and discussed previously, so to be able to positively and directly obtain a position to close the tap completely, without depending on the operation of a spring or return means for to do.

(a) le pointeau est monté dans le fourreau intermédiaire, de manière totalement libre, à la fois en translation et en rotation, par rapport à ce dernier, avantageusement dans certaines limites en translation précisées ci-après ;

(b) le moyen de rappel est extrait du robinet à pointeau proprement dit, et monté ou intégré dans la structure de l'appareil ; plus précisément, ce moyen de rappel est disposé entre une butée ménagée dans ladite structure, et le pointeau, en particulier son extrémité de commande ; ce moyen de rappel exerce préférentiellement une force de rappel, dirigée dans le sens de la fermeture du robinet, par exemple dans l'axe du pointeau ;

(c) le fourreau intermédiaire comporte, par exemple à l'une de ses extrémités, des moyens de vissage/dévissage par rapport au corps du robinet ; il est par ailleurs agencé pour déplacer le pointeau en translation, d'une part, par son extrémité de commande par exemple, à l'encontre du moyen de rappel, dans le sens de l'ouverture du robinet, par dévissage du fourreau intermédiaire, et d'autre part, dans le sens de la fermeture du robinet, et dans le sens de la poussée exercée par le moyen de rappel, par vissage du fourreau intermédiaire, lequel permet notamment de repousser positivement l'extrémité active dudit pointeau contre le siège du robinet.

In accordance with the present invention, the following modifications cooperate with each other, to solve the above problem:

(a) the needle is mounted in the intermediate sheath, in a completely free manner, both in translation and in rotation, relative to the latter, advantageously within certain limits in translation specified below;

(b) the return means is extracted from the needle valve itself, and mounted or integrated in the structure of the device; more precisely, this return means is disposed between a stop formed in said structure, and the needle, in particular its control end; this return means preferably exerts a return force, directed in the direction of closing the valve, for example in the axis of the needle;

(C) the intermediate sleeve comprises, for example at one of its ends, means for screwing / unscrewing relative to the body of the valve; it is also arranged to move the needle in translation, on the one hand, by its control end for example, against the return means, in the direction of opening of the valve, by unscrewing the intermediate sleeve, and on the other hand, in the direction of closing the valve, and in the direction of the thrust exerted by the return means, by screwing the intermediate sheath, which in particular makes it possible to positively push the active end of said needle against the seat tap.

The present invention further provides the following advantages.

According to the present invention, the needle is completely guided and maintained along its axis, with play limited functional, in the intermediate sheath, itself precisely positioned on the body of the tap. Under these conditions, the effort exerted on the needle control end, by the element is not likely to modify, by example to offset, significantly the support of the active end of the needle against its seat.

The arrangement and / or positioning according to the present invention of the recall means, allow to continuously recall a directed thrust into the direction of closing the tap, which allows catch up or compensate for the different functional games, preexisting or consecutive to the wear of the tap and / or its actuating element, and this by improving the safety of the device concerned, in the case of a gas fuel controlled by the tap. In practice, such games can exist, on the one hand between the thread and tapping of the screwing / unscrewing means of the sleeve intermediate, and secondly between the element actuation, for example trigger, and the end of needle control. In the latter case, if the trigger actuation is pinched between the free end of the return means and the needle control end, then the game between trigger and needle is automatically caught up under the effect of the reminder.

• la figure 1 représente une vue de face, avec arrachement partiel en coupe verticale, d'un chalumeau pour la soudure, ou tous autres travaux requérant des températures relativement élevées, intégrant un dispositif de contrôle du gaz combustible selon l'invention, et plus précisément un robinet à pointeau agencé selon la présente invention ; s'agissant du robinet, celui-ci est représenté à la figure 1, dans sa position complètement fermée ;
• la figure 2 représente une partie du chalumeau représenté à la figure 1, à échelle agrandie, dans la position du robinet correspondant au passage d'un débit gazeux relativement faible ;
• en correspondance avec la figure 2, la figure 3 représente le robinet, dans sa position correspondant au passage d'un débit maximum du gaz combustible.

The present invention is now described with reference to the accompanying drawing, in which:

• FIG. 1 represents a front view, with partial cutaway in vertical section, of a torch for welding, or any other work requiring relatively high temperatures, incorporating a device for controlling the combustible gas according to the invention, and more precisely a needle valve arranged according to the present invention; as regards the tap, this is shown in FIG. 1, in its fully closed position;
• 2 shows a part of the torch shown in Figure 1, on an enlarged scale, in the position of the valve corresponding to the passage of a relatively low gas flow;
• in correspondence with FIG. 2, FIG. 3 represents the valve, in its position corresponding to the passage of a maximum flow rate of the combustible gas.

• un moyen de réception 17 et maintien d'une cartouche 15 perforable et jetable, constituant une source d'un gaz combustible sous pression, par exemple du butane sous forme liquéfiée, ce moyen étant composé d'un pot ou cloche 18, pourvu à sa partie inférieure d'un couvercle ou socle 19, monté de manière amovible sur le pot 18 ;
• un dispositif 3 de contrôle du débit du gaz combustible, prélevé comme indiqué ci-après dans la cartouche, à savoir un robinet à pointeau, comprenant un corps métallique 5 ;
• un moyen 20 de prise de gaz dans la cartouche, intégré avec le corps 5 du dispositif 3 de contrôle du débit du gaz combustible, comportant un organe 21 de perforation de la cartouche ; ce moyen 20 de prise de gaz assure de manière réversible, à la fois un montage ou fixation de la cartouche 15 par rapport au corps 5 du dispositif 3 de contrôle, et une étanchéité entre le corps 5 et l'intérieur de la cartouche 15 perforée, la perforation s'effectuant à l'intérieur de ce moyen d'étanchéité 25 ;
• un brûleur 4 constituant l'organe fonctionnel de l'appareil, consommant le gaz combustible contrôlé par le robinet 3 ;
• un carénage formant poignée 16 de préhension, fixé sur le moyen 17 de réception et maintien de la cartouche 15.

The device 1 shown in FIG. 1 brings together in the same structure 2:

• a means 17 for receiving and holding a perforable and disposable cartridge 15 constituting a source of a pressurized combustible gas, for example butane in liquefied form, this means being composed of a pot or bell 18, provided at its lower part of a cover or base 19, removably mounted on the pot 18;
• a device 3 for controlling the flow of combustible gas, taken as indicated below from the cartridge, namely a needle valve, comprising a metal body 5;
• a means 20 for taking gas from the cartridge, integrated with the body 5 of the device 3 for controlling the flow of combustible gas, comprising a member 21 for perforating the cartridge; this gas-taking means 20 reversibly ensures both mounting or fixing of the cartridge 15 relative to the body 5 of the control device 3, and a seal between the body 5 and the interior of the perforated cartridge 15 , the perforation taking place inside this sealing means 25;
• a burner 4 constituting the functional member of the apparatus, consuming the combustible gas controlled by the valve 3;
• a fairing forming a handle 16 for gripping, fixed to the means 17 for receiving and holding the cartridge 15.

In the body 5 of the tap 3 are provided, a chamber 5a into which opens an orifice forming seat 5b (see Figures 2 and 3), an upstream passage 5c, communicating with the source 15 of combustible gas, by via the gas intake means 20, and arriving in chamber 5a through the orifice forming seat 5b, thus that a downstream passage 5d, leaving from the chamber 5a, towards the burner 4. A needle 6 is indirectly mounted on the body 5, movably in translation, in the axis of the seat 5b; it has an active end 6a, conical for example, cooperating with seat 5b. Means 7, consisting of two O-rings, are arranged between the needle 6 and the chamber 5a. A steering wheel 8 needle 6 rotary control, is arranged coaxially with the latter, remaining accessible to the user outside structure 2, and more precisely from the handle 16 of the welding machine.

• un fourreau métallique intermédiaire 9 est monté de manière mobile sur le corps 5, dans l'axe du siège 5b, et comporte à une extrémité 9a, des moyens 10 de vissage par rapport au corps 5, agencé à cet endroit de manière correspondante ; par exemple, l'extrémité 9a comporte un filetage, tandis que le corps 5 comporte un alésage taraudé, coopérant avec ce filetage ; le fourreau 9 est donc susceptible de se déplacer, à la fois en translation et en rotation, par rapport au corps 5, par vissage ou dévissage dudit fourreau ;
• le volant de commande 8 est calé sur le fourreau intermédiaire 9, aussi bien en translation qu'en rotation, en étant par exemple emmanché dur sur ledit fourreau 9 ;
• le pointeau 6 est monté de manière mobile dans le fourreau intermédiaire 9, de manière libre, et en translation et en rotation, par rapport à ce dernier ; il comporte une extrémité de commande 6b, agencée pour être déplacée en translation, ou poussée dans le sens de l'ouverture du robinet 3, par l'extrémité 9b du fourreau intermédiaire 9, opposée à celle comportant les moyens de vissage 10 par rapport au corps 5 du dispositif de contrôle 3.

The needle valve 3 is arranged as follows:

• an intermediate metal sheath 9 is mounted movably on the body 5, in the axis of the seat 5b, and comprises at one end 9a, means 10 for screwing with respect to the body 5, arranged at this location in a corresponding manner; for example, the end 9a has a thread, while the body 5 has a threaded bore cooperating with this thread; the sheath 9 is therefore capable of moving, both in translation and in rotation, relative to the body 5, by screwing or unscrewing said sheath;
• the control wheel 8 is fixed on the intermediate sheath 9, both in translation and in rotation, by being for example hard fitted onto said sheath 9;
• the needle 6 is mounted in a movable manner in the intermediate sheath 9, in a free manner, and in translation and in rotation, relative to the latter; it comprises a control end 6b, arranged to be moved in translation, or pushed in the direction of opening of the valve 3, by the end 9b of the intermediate sleeve 9, opposite to that comprising the screwing means 10 relative to the body 5 of the control device 3.

In addition to tap 3, an organ is provided actuation 11 only in translation of the needle 6, arranged in structure 2, and more precisely at the level handle 16 of the device. This actuator includes an actuating element 12, more specifically a trigger, accessible by the user, outside of structure 2 of the apparatus. Item 12 is linked mechanically at the control end 6b of the needle 6, to move the latter only in translation by report to headquarters 5b. A reminder 13, independent and outside the needle valve 3 itself, is mounted or integrated in structure 2, and more precisely in the handle 16, to recall the end of command 6b of needle 6, in the direction of closing the tap 3. This return means 13 consists of a spring made of two "U" branches, one of which 13a is fixed against a stop 50 in structure 2, and more precisely the handle 16, and of which the other mobile 13b press the control end 6b of the needle 6 with a hook-shaped back. Preferably, at rest, that is to say in the fully closed position of the tap 3, this return means 13 exerts a thrust relatively weak, even zero, against needle 6. Whatever the shape of the spring, loaded or not, the thrust or restoring force exerted is directed substantially in the axis of the needle 6.

As best shown in Figures 1 and 2, the sheath intermediate 9 has an axial hole 9c, shaped cylindrical, while the needle 6 has a rod axial 6c cylindrical. This axial hole and this axial rod are adapted to each other in cross section, to allow an adjusted relative displacement, and in translation and in rotation, from the needle 6 relative to the sleeve 9, possibly limited depending on the travel in translation 80 defined below.

As shown in Figure 2, the rod 6c of needle and the axial hole 9c of the intermediate sleeve have two sections 61 and 62, of diameters respectively different, section 61 stronger diameter being proximal to the seat 5b of the needle 6. In this way, the shoulder 14 between the two cylindrical sections of the axial hole 9c of the sleeve 9 determines a full opening stop, limiting the translational stroke of needle 6 relative to sleeve 9, in the direction of opening valve 3, and in any unscrewed position of the sleeve 9, by relation to the body 5. In this way also, the shoulder 70 existing between the two sections cylindrical of the axial rod 6c of the needle 6 determines a stop for closing the tap 3, making it possible to push or push the needle 6 positively and directly in its closed position, under the effect or action of the screwing the intermediate sleeve 9 relative to the body 5.

The trigger 12 is movable in translation, parallel to the axis of the needle 6, freely relative to to structure 2, and more precisely handle 16, and is slidably mounted on the control end 6b of the needle, between this last and the movable end 13b of the return means 13 described below.

The operation of the device described previously deduced from the previous description, in starting from the fully closed position shown at Figure 1, in which the control wheel 8 is fully screwed in, and trigger 12 comes completely out of the handle 16.

By unscrewing the handwheel 8, firstly the sleeve 9 moves relative to needle 6, according to a race 80, by moving the stop 14 fully open, relative to the closing stop 70. During this first time, the conical end 6a of the needle 6 remains glued against the seat 5b of the body 5, so that there is no gas passage. At the end of this first step, that is to say at the end of the race 80, the end 9b of the sleeve 9 presses against the control end 6b, by through the movable end 13b of the spring 13 and of trigger 12, against the restoring force exerted by the spring 13. From this moment, the end conical 6a of the needle 6 takes off relative to the seat 5b, and by turning the steering wheel 8, it is possible to set the desired minimum flow rate.

From the end of race 80, needle 6 is likely to move only in translation in the sleeve 9, enters, on one side, the position corresponding to the minimum flow rate determined by the user, and on the other side, the opening stop 14 complete. By pressing the trigger 12, always at against the return force exerted by the spring 13 on needle 6, the sheath 9 remaining stationary, it is possible to draw the needle 6, by the support of the trigger 12 against the movable end 13b of the spring 13, integral with the control end 6b of the needle 6. As soon as this trigger 12 is pressed, by therefore the conical end 6a of the needle 6 is released completely from seat 5b, letting a flow pass maximum gas to the functional unit or burner 4.

Releasing the trigger 12 gives way to the return action of the spring 13, which repels the control end 6b of the needle 6 against the end 9b of the sleeve 9, to reduce the gas flow at a minimum value according to the representation of the figure 2.

By screwing back the control wheel 8, the stop 14 against stop 70, and from that moment, we push back positively needle 6, and in the direction of closing, and in the direction of the thrust exerted by the spring 13, by releasing the latter, the complete screwing of the steering wheel 8 leading to the position shown in Figure 1, in which the active end 6a of the needle 6 is sealingly pressed against the seat 5b.

Thanks to the invention, it is therefore possible to reliable and safe way, to get zero values, minimum and maximum for gas flow, while having positive closure of the control device 3, needle valve type. And the return to the minimum value takes place automatically, by releasing trigger 12.

Claims (10)

1. Appliance (1) for dispensing or consuming a fluid, consisting of at least one structure (2) combining first of all a needle valve (3) comprising a body (5) in which there is formed a chamber (5a) into which there opens an orifice forming a seat (5b), with an upstream passage (5c) arriving in the said chamber via the said orifice, and a downstream passage (5d) leaving the said chamber, an intermediate sleeve (9) mounted so that it can move on the said body (5) along the axis of the said seat (5b), a valve needle (6) comprising an active end (6a) interacting with the said seat (5b) and an operating end (6b) mounted so that it can move in the intermediate sleeve (9) along the axis of the said seat (5b), means (7) of sealing the valve needle (6) with respect to the chamber (5a), and a rotary knob (8) for operating the valve, arranged coaxially with the said valve needle and accessible from outside the structure (2) of the said appliance, secondly, a member (11) for actuating the valve needle (6) in terms of translation, this member being arranged on the structure (2) of the appliance and comprising an actuating element (12) accessible from outside the structure of the appliance and mechanically connected to the operating end (6b) of the valve needle so that the latter can be shifted in terms of translation with respect to the seat (5b), and a return means (13) for returning the said operating end (6b) in the direction for closing the valve, and thirdly a functional member (4) for dispensing or consuming the controlled fluid, characterized in that, in combination:

   the valve needle (6) is mounted in the intermediate sleeve (9) so that it is free in terms of translation and in terms of rotation with respect to the latter;

   the return means (13) is arranged between a stop (50) formed in the structure (2) of the appliance and the valve needle (6), especially its operating end (6b);

   the intermediate sleeve (9) comprises means (10) of screwing with respect to the body (5) arranged correspondingly and is arranged, on the one hand, to shift the said valve needle (6), especially its operating end (6b) in terms of translation against the return means (13) in the direction for opening the valve, by unscrewing the said intermediate sleeve and, on the other hand, for shifting the said valve needle (6), especially its active end (6a) in terms of translation in the direction for closing the valve and in the direction of the thrust exerted by the return means (13), by screwing the said intermediate sleeve.
2. Appliance according to Claim 1, characterized in that the intermediate sleeve (9) comprises an axial hole (9c) and the valve needle (6) of the fluid-control device comprises an axial stem (6c), these components being matched to one another in terms of cross section so as to allow the relative shifting of the valve needle in terms of translation with respect to the sleeve.
3. Appliance according to Claim 1, characterized in that the valve (3) has a wide-open stop (14), limiting the travel of the valve needle (6) with respect to the sleeve (9) in the direction for opening the valve, and in the unscrewed position of the intermediate sleeve.
4. Appliance according to Claim 1, characterized in that the valve (3) comprises a closed stop (70), designed to push the valve needle (6) into the valve-closed position, under the effect of the screwing of the intermediate sleeve (9).
5. Appliance according to Claims 3 and 4, characterized in that the wide-open stop (14) and the closed stop (70) are obtained by designing the stem (6c) of the valve needle and the axial hole (9c) of intermediate sleeve to have two sections (61,62) of respectively different diameters, the larger-diameter section (61) being the proximal section relative to the seat (5b) of the valve needle.
6. Appliance according to Claim 1, characterized in that the actuating element (12) can be shifted in terms of translation parallel to the axis of the valve needle (6) freely with respect to the structure (2) and is mounted on the operating end (6b) of the valve needle.
7. Appliance according to Claim 1, characterized in that the actuating member return means (13) is a hairpin-shaped spring, the stationary end (13a) of which is mounted in the structure (2), and the moving end (13b) of which is mounted on the operating end (6b) of the valve needle.
8. Appliance according to Claim 1, characterized in that the return means (13) is designed and/or arranged to exert a return thrust directed in the direction of the valve needle (6).
9. Appliance according to any one of Claims 1 to 8, running on fuel gas, especially a blow torch for soldering or other work requiring relatively high temperatures, according to which the functional member (4) is a burner, and the upstream passage communicates with a source (15) of pressurized fuel gas.
10. Appliance according to Claim 9, which is portable, and the structure (2) of which comprises, on the one hand, a grip (16) for holding, and, on the other hand, a means (17) of accommodating and retaining a cartridge (15) of pressurized fuel gas, with a means (20) of withdrawing gas from the said cartridge, possibly incorporated into the body (5) of the device (3) for controlling the flow of the gas.

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