EP2145652B1 - Cartridge of film-forming additive for fire extinguishers - Google Patents

Description

The present invention relates to the equipment extinguishers emitting a liquid under pressure.

An extinguisher of this type forms a cylinder filled with water, which, at rest, is depressurized, that is to say substantially at atmospheric pressure. The neck of the bottle is equipped with a head which, in addition to the hermetic at rest, provides two functions.

The first function is to allow the ejection of water through a passage to which is connected a hose whose free end is provided with a nozzle.

The second function is to control the pressurization of the stored water, thus pushing it at high speed towards the ejection passage. To do this, propellant is released under pressure into the cylinder. The water to be propelled to the outside must, however, be enriched with a film-forming additive liquid, which will thus form a surface layer smothering the flames. However, for this additive to be preserved, during storage of the bottle, it must be kept in a bottle constituting a sealed cartridge, that is to say, protected from water. When using the fire extinguisher, it is therefore necessary to quickly dilute this additive in the water of the carboy, in the most homogeneous way possible to have an output at optimum efficiency. The problem is to quickly open this cartridge in a simple way.

It is known to install the cartridge inside the bottle and seal the cartridge by a frangible membrane, which will implode when the pressure of the propellant gas exceeds the limit of rupture. Such a solution certainly answers the problem but it has drawbacks. On the one hand, the rupture limit of the membrane can not be precisely defined. On the other hand, the rupture of the membrane may affect only a very localized area of the latter, since, as soon as a beginning of piercing occurs, the internal pressure of the cartridge rises to the level of the external pressure. . Indeed, even if the membrane is split in two over its entire diameter, the two lips thus formed may remain mutually adjacent, so that the evacuation of the additive will be only very partial. In particular, the eddies caused by the release of the propellant in the carboy will hardly propagate inside the cartridge, which will not be "rinsed" in this way. In addition, the membrane is a fragile operculum that must be protected during transport. In addition, in manufacture, the membrane requires a machine to heat seal.

A cartridge comprising an outlet opening closed by an ejectable closure member out of the cartridge under the effect of a determined pressure is known from the prior art, see document DE 43 31 408 A .

The present invention aims to provide another solution to at least one of the above problems related to the additive cartridge.

• un logement pour l'additif,
• un passage de sortie du logement,
• un organe obturateur du passage de sortie, et
• des moyens de maintien de l'organe obturateur dans une position d'obturation du passage de sortie tant qu'une pression externe est inférieure à une valeur de seuil prédéterminée.

For this purpose, the invention firstly relates to a cartridge intended to contain an additive to be mixed with a fire extinguishing fluid contained in an extinguisher bottle, the cartridge comprising:

• a housing for the additive,
• an exit passage of the dwelling,
• a shutter member of the outlet passage, and
• means for holding the shutter member in a closed position of the output passage as long as an external pressure is less than a predetermined threshold value.

The holding means allowing a recoil of the shutter member towards the interior of the housing when the external pressure exceeds the predetermined threshold value.

The holding means thus provide a differential pressure threshold below which the shutter member remains in the closed position, and, above the threshold, the shutter member will be erased to open the cartridge and thus allow, in operation that the eddies of the pressurized external water enter the cartridge to rinse it and thus empty it of its additive, which will thus mix in the total volume of external water.

As the opening is effected by erasure of the movable element that constitutes the shutter member, and not by tearing of a lid, it is conceivable that the setting of the pressure threshold, or force, opening can be relatively accurate .

In addition, the assembly inherently has no fragility since its principle does not rely on a rupture of the seal, so that the cartridge does not impose any particular packaging constraints for its transport.

The precise ejection path of the shutter member is not an essential feature, that is to say that the shutter member may for example be rotatably mounted, and in such a case it may be provided to open the passage as soon as it begins to move, that is to say that the shutter member bears against a seal.

The threshold value can be set to any desired value, for example two to four atmospheres. The final pressure of the propellant, determining the speed of the exit jet of the fire extinguisher, will be set at five atmospheres, for example, with a margin of safety of 1 atmosphere on the fact that the cartridge actually opens.

It is conceivable that the nature of the additive is of little importance with regard to the mechanism according to the invention, that is to say that the product internal to the cartridge can be of any chemical nature, and in any physical form, and for example liquid, gaseous or powdered. Therefore, uses other than the one at the origin of the present invention are perfectly conceivable, such as for example the mist spray of fruit tree processing product.

The shutter member can also be slidably mounted in the manner of a piston.

The holding means are arranged to allow a retreat of the shutter member towards the interior of the housing.

The shutter member may be associated with a seal, if the constitution of the shutter member does not allow it to ensure the desired seal.

In one embodiment, the holding means are constituted by a lateral surface of the shutter member designed to slide with friction on a homologous surface, of constant cross section, of the outlet passage.

The shutter member, and precisely the piston, will have to slide for a certain length before being totally ejected from the passage and pushed back out of it.

The coefficient of friction between the lateral surface of the piston and the sliding contact surface of the passage intervenes in the value of the threshold. In addition, if the piston, or a seal that surrounds it, has a certain elasticity at least radial that allowed to introduce it initially into the passage despite the fact that it has a transverse clearance template a little excessive compared to a template offered by the passage, the elastic radial force thus stored increases all the value of the threshold since this value is equal to the product of the overall radial force, enclosing the piston, by the coefficient of friction.

In another embodiment, the shutter member has a transverse occupancy jig having a lateral appendage projecting from a passage jig provided by said passage, the appendix being deformable to fit inside the passage jig. when the external pressure exceeds the threshold value.

The appendix therefore occupies a natural position, of rest, which is a position of radial deployment, preventing the recoil of the shutter member, and the external pressure force will force the appendage to retract globally radially relative to the direction of rotation. retreat of the shutter member, such as a piston, whose occupancy gauge will thus comply with the free passage template. The shutter member will therefore be able to be rejected completely.

The above appendage may have any desired shape and, in particular, constitute a ring relief completely surrounding the piston, or constitute a sector or even a simple radial finger forming a locking pawl in the closed position.

Similarly, this appendix may be provided in any position along the passage, inasmuch as the wall of the passageway has a radial component relief on which a surface of the appendage may be abutted in the direction of recoil, "axial". for example, towards the interior of the dwelling. Conveniently, the mouth of the passage may provide such a surface, the lip, that is to say that the piston may for example have a longitudinal profile T, the trunk of the T being of section adjusted to the gauge of the passage and the branches of the T constituting the appendage, which will abut on the radial surface of the lip.

In another embodiment, the holding means comprise a return spring.

The shutter member preferably comprises an anti-overthrust appendage internal to the housing, the shutter member with the appendix having a length of space greater than any free length in the housing.

It can thus take any useful measure to prevent the outer side of the shutter member to return against the outlet of the passage.

For example, there is provided spacer means arranged to prevent a return of the shutter member towards the outlet passage.

This avoids any risk that the shutter member will return substantially close the passage. If the shutter member is mounted free after recoil, vortices can indeed tend to bring it back to the passage. If the shutter member is biased towards it by a spring, it is necessary that this spring is inefficient after opening.

The spacer means may have very different shapes, depending on the type of mounting of the shutter member or piston. If the shutter member is and remains guided after opening, it may be sufficient to provide that the side of the shutter member facing the passage is provided with a radial and flexible spacer finger, which will thus be able to deploy radially after recoil the shutter member in the housing, if this is the case. In the event of the shutter member returning to the passage, the free end of the finger constitutes an out-of-jig appendage and thus abuts against a wall zone of the housing close to the internal outlet of the passage, thus preventing the return of the organ. shutter until this outlet.

In a particular embodiment, the holding means comprise an abutment element consisting of at least one sector of a frustoconical surface element of Belleville washer type whose one edge of larger diameter is in anti-recoil support on a shoulder of passage and an opposite edge constitutes a stop for a shoulder of the shutter member.

The shutter member must therefore push back the abutment element, which is a sort of string of radial tongues juxtaposed, distributed around, and working in buckling, to return the frustoconical shape, and this is the strength of reversal of the frustoconical shape which determines the desired threshold.

Interestingly, the stop member is a Belleville washer and further constitutes a said seal means.

Both functions are thus provided very economically by a single element.

Interestingly, the housing comprises a useful volume, for the additive, and a dead volume separated by a wall which, at rest, has a bulge in the direction of the useful volume, so to restrict it, and which is arranged for, under the effect of an increase of pressure in the useful volume, return its bulge, towards the dead volume, thus to generate a depression in the useful volume by increase of this one.

In this way, once the resistance threshold is crossed, the braking at the depression of the shutter member or piston is transformed into a driving action, which can thus make it possible to exercise alone, or at least facilitate, a final movement of depression of the piston, to clear the passage.

In a dual manner, the housing may comprise a deformable wall zone having an outwardly curved shape of rest and arranged, under the effect of the external pressure, to take a curved shape towards the interior of the housing, thus to push back the shutter member to the outside.

This may for example be the bottom of the cartridge which has the convex shape and which, by turning its shape, constitutes a diaphragm having the effect of a piston to reduce the volume of the housing and thereby increase the pressure to expel the shutter member or piston out of the passage.

The invention also relates to a liquid extinguisher bottle, comprising means for releasing a propellant gas pressurizing the liquid, and comprising an additive cartridge to be mixed with the liquid during use, a cylinder characterized by the that it is a cartridge according to the invention.

• la figure 1 est une vue en coupe longitudinale d'une cartouche selon l'invention, fermée par un bouchon en forme de piston à enfoncer,
• les figures 2, 3 et 4 sont des vues en perspective de la cartouche en coupe axiale, avec le piston en position respectivement de fermeture, juste après ouverture et en position finale d'ouverture totale, et
• la figure 5 représente le détail d'un joint en rondelle Belleville selon une variante.

The invention will be better understood with the aid of the following description of an embodiment of a cartridge according to the invention and a cylinder containing it, with reference to the appended drawing, in which:

• the figure 1 is a longitudinal sectional view of a cartridge according to the invention, closed by a plug in the form of a piston to be driven,
• the Figures 2, 3 and 4 are perspective views of the cartridge in axial section, with the piston respectively in the closed position, just after opening and in the final fully open position, and
• the figure 5 represents the detail of a Belleville ring gasket according to a variant.

The figures 1 , 2, 3 and 4 represent a cartridge 1 intended to contain an additive to be mixed with a fire extinguishing fluid, contained in an extinguisher bottle. The cartridge 1 comprises a hollow body 2, forming a housing 10 for a volume 14 of additive in liquid form, with a determined volume of gas, for example 30% of air, the housing 10 resistant to at least one predetermined external pressure allowed. The body 2 comprises a neck 3 having an outlet passage 11 provided with a shutter member here in the form of a piston 30 mounted to disappear from the passage 11 when it undergoes an external differential pressure force. In the intended use, it is external water pressurized by propellant, which provides the force necessary to drive the piston 30. The neck 3 has an inner surface 4 of said passage 11 which defines a template of passage 11G, that is transverse, which is constant along the neck 3. The passage template 11G is here circular around a virtual axis 20 which defines the direction of insertion of the piston 30. The notion of rotation of the piston 30 does not intervene in this assembly, it is conceivable that the sections of the above elements might not be circular.

The piston 30 constitutes a generally cylindrical plug, with a cylindrical body 31 of cross section having a occupancy mask 31G corresponding to the passage template 11G, with however a slight radial clearance which is caught by an O-ring 40 thus crushed radially between a cylindrical peripheral surface 31 P of the body 31 and the inner surface 4 of the neck 3. The O-ring 40 can be partially housed in a groove of the inner surface 4 or the peripheral surface 31P, that is to say fixed or the piston 30. The piston 30 comprises, on the external side, a head 32 of maximum diameter representing a clearance jig 32G slightly exceeding a diameter value of the passage template 11G. Precisely here, the head 32 is frustoconical widening going axially outward, that is to say, it abuts against a radial surface of the lip 5 constituting the free end of the neck 3. The direction "axially outward" means here the downward direction along the axis 20 on the figure 1 , that is to say the direction opposite that of depression of the piston 30 in the passage 11, towards the housing 10.

In this example, an outer surface 33 of the head 32 carries a plurality of at least two mutually spaced soft antenna-like spacers 34 which, in the unstressed position, have ends of greater length to the diameter of the passage 11.

In this example, there is further provided an inner appendage 35, anti-overturning, which is integral with the body 31 and which extends in the housing 10, here axially, to determine a total length greater than any free length at the inside the dwelling 10.

The operation of the piston 30 will now be exposed.

In the closed position according to figures 1 and 2 , O-ring 40, possibly in several staged axially, provides the desired seal to hermetically seal the cartridge 1.

When the external pressure exerted on the outer surface 33 of the head 32 increases, it therefore exerts an axial repulsion force of the piston 30 along the axis 20. At first, the head 32 inhibits any recoil movement because it has a 32G clearance template larger than the passage template 11G that is offered. The narrowest part of the frustoconical shape of the head 32 is therefore more strongly supported by an axial contact force on the radial free end surface of the neck 3. As the external pressure increases, the above contact force tends, by wedge effect, to fold radially the bead that constitutes the frustoconical portion of the head 32, the material thereof having the desired elasticity in this area. Finally, the head 32 is thus gradually pushed into the inlet of the passage 11 and the external pressure can then, without difficulty, axially push the piston 30 to the internal outlet of the passage 11, since the housing 10 contains a compressible element, to to know gas. The only resistance to this translational movement is constituted by the friction of the head on the inner surface 4 of the neck 3 and the friction of the seal 40.

The above deformation of axial compression of the head 32 thus corresponds to a well-defined external pressure force since the material, for example a plastic material, of the head 32 has perfectly known elastic properties. Thus, the mechanism has a resistance to depression that is perfectly defined, that is, calibrated to a threshold value.

So that the external pressure force can be applied effectively, in order to drive the piston 30, the body 2 must be sufficiently dimensionally stable so that the internal pressure does not have an increase equal to the increase of the external pressure, in which case the differential pressure would remain constant. The housing 10 is designed to withstand the external pressure sufficiently to maintain a substantially constant volume. The internal pressure therefore remains substantially constant and the increase in the external pressure results in an increase of substantially the same value for the differential pressure experienced by the piston 30, that is to say the external pressure exerted on the external surface 33 of the head 32 with respect to the internal pressure exerted on the axial end of the body 31. The body 2 must therefore remain sufficiently indeformable in the desired pressure range to be able to drive the piston 30, that is to say that the Maximum permissible external pressure, up to which the body 2 sufficiently resists, is greater than any pressure necessary to depress the piston 30.

It will be noted that, in the absence of gas, it would be possible to provide, in the housing 10, a partial "dead" volume 16 ( figure 1 ) completely empty limited by an internal partition wall (referenced 17 and occupying a rest position referenced 18 on the figure 1 ) held by a spring of limited force to thereby allow the recoil of the inner wall 17, that is to say the decrease of the dead volume 16, as soon as the piston 30 sinks. Alternatively, there may also be provided a crushable material, i.e. of the closed-cell foam type.

In another variant, and as precisely drawn, the inner wall 17 for separating the dead volume 16 may be free of an added spring and it is itself which provides the desired spring function. The inner wall 17 may thus be cup-shaped slightly convex towards the outside of the dead volume 16, that is to say towards the portion 14 of the housing 10 containing the additive, that is to say the volume useful. When the piston 30 begins to be depressed in the passage 11 by the effect of the external pressure, the useful volume 14 remains constant if its content is incompressible, that is to say is entirely constituted by the additive liquid, without gas that is to say without the volume 15. If the volume of gas 15 is however provided, it serves as a damper, or integrator of overpressure, and therefore delays the transmission of the external pressure to the inner wall 17.

In the absence of the volume of gas 15, the loss of useful volume 14 on the side of the piston 30, which sinks in this volume 14, is automatically compensated by a crushing of the curved wall 17, which reduces by the same amount dead volume 16. Beyond a certain level of deformation, that is to say when the top of the inner wall 17 in cup has been brought close to the base plane delimited by the periphery of the cup, the curved shape is turned, that is to say that the inner wall 17 takes a concave shape indicated by the reference 19, which is the shape of mirror symmetry with respect to the convex curved shape of origin 18. This final deformation is very brutal since it is the release of stored deformation forces. It follows that this backward movement of the inner wall 17 in the cup tends to produce a depression which attracts the piston 30 inwardly towards the inside of the useful part 14 of the housing 10. It is thus advantageous to provide that the increase of useful volume thus generated for the overturning of the internal wall 17 in cup corresponds to a value of volume remaining to be traveled by the head 32 of the piston 30 in the passage 11 for to be released, in the position according to figure 3 . In this way, the inner wall 17 as a cup serves as internal corkscrew, inwardly pulling effect. The violence of the attraction of the piston 30 contributes to driving the additive out of the housing 10. On the Figures 2 to 4 , the bottom of the cartridge 1 has an external appendix homologous to the appendix 35, preventing the reversal of the cartridge 1 in the cylinder.

Alternatively, a dual operation can be provided. In such a case, the dead volume 16 is not provided and the wall 17 is no longer internal but constitutes a deformable zone, here in the background, of the outer wall of the housing 10. At rest, the wall 17 has the shape of cup convex outwardly referenced 19, that is to say that the housing 10 has a maximum volume. If the pressure increases beyond a certain threshold, the bulge of the wall 17 turns and it takes the retracted position 18, that is to say a concave shape in external view. The retracted position 18 therefore corresponds to a minimum volume of the housing 10. In the absence of any internal gas, the volume of the housing 10, occupied entirely by the additive liquid, non-compressible, remains constant, so that the piston 30 is driven outwardly over a certain length to "recover", in the outlet passage 11, the volume "lost" between the positions 19 and 18. The outlet passage 11 can thus be provided with a cross section sufficiently small for the flushing length above exceeds the effective length of the outlet passage 11, where the piston is initially 30. This is therefore totally ejected by the overturning of the bulge of the wall 17.

It will be noted that the wall 17 may, at rest, have some prestressing, to lower the trigger threshold, that is to say, of turning its bulge. On the figure 1 it can thus be provided that the bottom of the body 2 remains as a rest stop but is pierced, that is to say that the "dead" volume 16 is in communication with the outside, and is functionally non-existent, as indicated. In such a case, and contrary to the drawing, the wall 17 initially occupies substantially the outwardly curved position 19, but however less than the natural form excluding stress represented, that is to say that the wall 17 undergoes prestressing on the part of the indeformable bottom of the body 2, for example at the axis 20, preventing its total bulging outwardly. The prestressing energy as well stored therefore provides a force directed inwards, which is thus added to the force of external pressure exerted by the external water.

Returning to the present embodiment, the piston 30 is of lower density than that of the additive, that is to say that the piston 30, once released, floats on the surface thereof, according to the figure 4 . Therefore, the cartridge 1 is preferably used in the position shown, that is to say, turned, so that the piston 30 floats at the bottom of the housing 10 according to the figure 4 , opposite the neck 3 which is in the lower part, and thus flush the additive during the course of the corresponding path. Cartridge 1 is thus immersed in the water of the fire extinguisher and is held therein in the returned orientation indicated above by blocking between two walls or the like, by its external appendix, or by sealing of its neck 3 or anchoring neck 3 at the bottom of the extinguisher bottle, if the cartridge 1 is of lower density than that of water.

Once the piston 30 is depressed, the internal appendage 35 prevents it from being turned over, so that it ensures that the spacer antennas 34 constitute nonreturn stop lugs which prevent any axial return of the piston 30 in the opposite direction, towards the outlet. 11. The spacer antennas 34 may be replaced by any other flexible element which, once deployed in the housing 10, will have a sufficient grip to keep the head 32 away from the internal outlet of the passage 11. The two antennas spacers 34 may in particular be joined to form a wide loop holding the piston 30 in the enlarged portion of the housing 10, that is to say at a distance from the passage 11.

As a variant, the crushing of the frustoconical portion of the head 32 can be replaced by a pivoting of the material considered in this zone, that is to say a radial and axially outward folding, that is to say say down the figure 1 . Indeed, the frustoconical portion of the head 32 may be replaced by a pivoting tongue, or several crown, occupying the position of the surface of this frustoconical portion, the rest being empty, that is to say in the area of around the outer surface 33, where will be able to fold the tongue above. In such a case, the tongue is elastic or rigid but is pivotally mounted elastically or pivotally with irreversible deformation, that is to say of the plastic type. The crown of tongues may be limited to one or several sectors spaced apart from the periphery of the head 32, which will be able to rotate by a folding radial component, without interfering with each other.

In another variant, the frustoconical portion constituting here the head 32, which has a template 32G initially incompatible with the passage template 11G, can be located axially in any desired position, insofar as the inner surface 4 of the neck 3 has a discontinuity of its cross section, that is to say has a groove in a certain axial position, in which may initially be housed a radial relief of the body 31, providing the initial ratchet function that assured the head 32.

According to another variant illustrated on the figure 5 , where the elements homologous to those of the figure 1 have the same reference preceded by the hundred "1", the seal 40 is replaced by a seal 140 representing a frustoconical surface, elastically deformable material, for example a metal or plastic material, providing both the desired seal and the initial resistance calibrated at the depression of the piston 130. Such a seal 140 is a Belleville washer, a circular edge 141 of larger diameter, constituting the base of the frustoconical portion, inner side of the cartridge 1, is in anti-backing. axial recoil on a shoulder 108 of the inner surface 104 of the passage 111. An opposite circular edge 142, therefore outer side, of smaller diameter, serves as a stop to the head 132 of the piston 130, at a shoulder 132P of this- The head 132 may in fact have the same section as the body 131, that is to say it has no specific function, and the shoulder 132P is a flank, axially outer side, of a groove separating the head 132 from the body 131.

A seal of this shape, not planar, is for example used to close the jars of jam, but it is then used in pinching between its two large opposite surfaces, the inner and outer edge edges not intervening.

On the contrary, in the present application, the crushing forces are exerted through the two opposite circular edges, that is to say that the profile of the joint 140 constitutes a string of juxtaposed tabs working in buckling, and not in pinch. Precisely, under the effect of the external pressure, the shoulder 132P of the head 132 axially pushes the seal 140 and its initial profile in a ring-shaped tongue, with a substantially rectilinear profile in axial section, as drawn, is transformed into a curved profile, due to buckling. Finally, the frustoconical shape turns around, that is to say that the edge of smaller diameter 142, outer side, is pushed behind the radial plane defined by the edge of larger diameter 141. The energy required to do so represents a threshold below which the external pressure can not drive the piston 130, even if it recedes slightly. In addition, an O-ring 40 may be provided, that is to say that the seal 140 exposed above may constitute a poor seal, particularly in the activation phase of the cartridge. It can even be provided that the above seal 140 is in fact a purely mechanical threshold setting element, not a seal.

Once past the radial plane of the edge of larger diameter 141, the elastic deformation energy stored by the seal 140 can, in the opposite direction, be released, that is to say that the piston 130 then undergoes from it an axial force pushing inwardly of the housing 10. It is thus possible to arrange the seal 140 near the internal outlet of the passage 111, thereby to violently expel the piston 130 towards the interior of the housing 10. On the one hand this clearly frees the passage 111 and, on the other hand, it causes a swirl which expels the additive to the passage 111.

The seal 140 may, however, be provided free of elastic deformation properties, and only its resistance to deformation is used.

In all cases, the Belleville washer above can be limited to one or a few sectors providing the mechanical function described above, the sealing being provided by another element.

Claims (12)

1. A cartridge (1) intended to contain an additive to be mixed with a fluid for extinguishing a fire contained in a carboy of fire extinguisher, the cartridge comprising:

   a housing (10) for the additive,

   an passage (11, 111) for outlet from the housing,

   a closure member (30, 130) for the outlet passage (11, 111), and

   a means (32, 132P, 140) for holding the closure member (30, 130) in a position closing the outlet passage (11, 111) as long as an outside pressure is below a predetermined threshold value,

   characterized in that the holding means (32, 132P, 140) allows a return of the closure member (30, 130) toward the inside of the housing (10) when the outside pressure exceeds the predetermined threshold value.
2. The cartridge according to claim 1, wherein the closure member (30, 130) is associated with a sealing gasket (40, 140).
3. The cartridge according to one of claims 1 and 2, wherein the holding means consists of a lateral surface (31P) of the closure member (30) provided to slide frictionally on a homologous surface (4), with a constant cross section, of the outlet passage (11).
4. The cartridge according to one of claims 1 to 3, wherein the closure member (30) has a cross occupation gauge (11G) comprising a lateral appendix (32) overhanging a passage template (11G) offered by said passage (11), the appendix (32) being deformable to return to the inside of the passage template (11G) when the outside pressure exceeds the threshold value.
5. The cartridge according to one of claims 1 to 4, wherein the holding means comprises a return spring.
6. The cartridge according to one of claims 1 to 5, wherein the closure member comprises an anti-flip appendix (35) inside the housing (10), the closure member (30) with the appendix (35) having a length with a bulk greater than any free length in the housing (10).
7. The cartridge according to one of claims 1 to 6, wherein bracing means (34) are provided arranged to prevent the closure member (30) from returning toward the outlet passage (11, 111).
8. The cartridge according to one of claims 1 to 7, wherein the holding means comprises a stop element (140) consisting of at least one sector of a tapered surface element of the Belleville washer type whereof an edge with a larger diameter (141) is in anti-return bearing on a shoulder (108) of the passage (111) and whereof an opposite edge (142) constitutes a stop for a shoulder (132P) of the closure member (130).
9. The cartridge according to claims 2 and 8 in combination, wherein the stop member (140) completely constitutes a Belleville washer and also constitutes the sealing gasket.
10. The cartridge according to one of claims 1 to 9, wherein the housing (10) comprises a useful volume (14, 15), for the additive, and a dead volume (16), which are separated by a wall (17) which, at rest, has a bulging (18) toward the useful volume (14, 15) to thereby restrict it, and which is arranged so as, under the effect of a pressure increase in the useful volume (14, 15), to flip its bulging toward the dead volume (16), to thereby create a vacuum in the useful volume (14, 15) by increasing it.
11. The cartridge according to one of claims 1 to 9, wherein the housing (10) comprises a deformable wall area (17) having an outwardly bulged rest shape and arranged so as, under the effect of the outside pressure, to assume a shape bulged toward the inside of the housing (10), to thus push the closure member (30, 130) back toward the outside.
12. A carboy for liquid fire extinguisher, comprising means for releasing a propulsive gas pressurizing the liquid, and comprising a cartridge of additive to be mixed with the liquid during use, the carboy being characterized in that it is a cartridge (1) according to one of claims 1 to 11.

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