EP3519322A1

EP3519322A1 - Device for dispensing a pressurised material

Info

Publication number: EP3519322A1
Application number: EP17784371.1A
Authority: EP
Inventors: Raphaël TEOLDI; Marc LETOURNEUR
Original assignee: ArianeGroup SAS
Current assignee: ArianeGroup SAS
Priority date: 2016-09-28
Filing date: 2017-09-27
Publication date: 2019-08-07
Anticipated expiration: 2037-09-27
Also published as: US11117005B2; US20190290949A1; WO2018060594A1; EP3519322B1; FR3056416B1; FR3056416A1

Abstract

The invention concerns a device (100) for dispensing a pressurised material, comprising a body (110) defining a pressurisation chamber (160) comprising a gas generator (130) and a tank (170) containing the material to be delivered, said tank being delimited by a bottom (140) provided with an outlet opening (141), the device further comprising a piston (150) configured to move inside the body (110), the piston separating the pressurisation chamber from the tank, the gas generator (130) being configured to trigger the dispensing of the material out of the body (110) through the outlet opening (141) by shifting the piston from a first material storage position to a second material dispensing end position in which the piston faces the bottom (140), the piston (150) having, in the first position, a housing (155) closed by a frangible portion (157) on the pressurisation chamber (160) side and open on the tank (170) side, the housing containing a rupture member (180) that is held in said housing and that defines a channel opening into the tank, said rupture member being longer than the housing and extending protruding from the piston in such a way that the frangible portion (157) is broken by the rupture member when the piston is in the second position.

Description

Device for dispensing a pressurized material

Background of the invention

The invention relates to a device for dispensing a pressurized material.

It is known from the state of the art to implement devices for dispensing a liquid material having two chambers separated by a piston.

Such devices comprise a first chamber comprising a gas generator and a second chamber in which the liquid to be dispensed is present, the first and second chambers being separated by the piston.

In these devices, the gas generator is first actuated to pressurize the first chamber. This overpressure created in the first chamber is transmitted by the piston to the liquid thus distributing it outside the device. During delivery of the liquid, the piston moves in said device and the volume of the second chamber is gradually reduced. The piston moves to abut against the bottom of the device when the material distribution is complete. In this type of device, the piston ensures at the end of the race the tightness of the system and the internal volume of the device thus remains pressurized. This residual pressurization can in some cases be a disadvantage. In addition with such systems when a pipe is connected to the outlet of the device, the pipe remains filled with liquid. The liquid present in the pipe not participating in the desired function, this causes a decrease in the effectiveness of the device.

It is therefore desirable to provide a device whose internal volume can be depressurized at the end of the distribution of the material and having an improved efficiency by allowing the residual liquid to be purged.

Solutions have been proposed in the state of the art for this purpose. However, these solutions can be relatively complex because of the integration of a significant number of additional elements and the need to perform a number of additional steps to manufacture such devices or may have reliability problems by presenting an inadvertent leakage loss between the two chambers when the device is subjected to external mechanical stresses or when the liquid expands under the effect of heat.

The invention aims to solve the problems of devices of the state of the art mentioned above. Object and summary of the invention

For this purpose, the invention proposes, in a first aspect, a device for dispensing a pressurized material comprising a body defining a pressurizing chamber comprising a gas generator and a reservoir containing the material to be delivered, said reservoir being delimited by a bottom provided with an outlet, the device further comprising a piston configured to move within the body, the piston separating the pressurizing chamber from the reservoir, the gas generator being configured to trigger the dispensing of the material outside the body through the outlet orifice by passing the piston from a first material storage position to a second end of distribution position of the material in which the piston is facing the bottom,

the piston having, in the first position, a housing closed by a fragile portion on the side of the pressurization chamber and open on the side of the reservoir, the housing containing a rupture element held in said housing and which defines a channel opening into the reservoir said breaker member having a length greater than the length of the housing and projecting from the piston so that the brittle portion is broken by the breaker member when the piston is in the second position.

The gas generator is configured to produce a pressurizing gas exerting pressure on the piston, which pressure is communicated by the piston to the material in the reservoir. The outlet orifice is, in turn, configured to allow the delivery of the material to the outside of the body following the pressurization of the reservoir by the gas generated in the pressurizing chamber. The invention advantageously provides a reliable device and simple design allowing the end of the material distribution, when the piston is in the second position, automatically depressurize the inside of the body. Indeed, the design of the device according to the invention simply requires to provide in the piston a closed blind housing on the side of the pressurizing chamber and open on the side of the tank in which a rupture element is present. This rupture element extends, when the piston is in the first position, projecting relative to the piston in the reservoir. The rupture element has, in addition, a significant length, greater than that of the housing. These characteristics of the rupture element make it possible to ensure the breaking of the fragile portion closing the housing when the piston passes from the first to the second position. Indeed, the gas generator is configured to, when triggered, move the piston towards the bottom to move the rupture element in the housing following the impact of the projecting portion of the element breaking with the bottom. This displacement of the rupture element in the housing makes it possible to break the fragile portion by impact with the latter. When the fragile portion is broken, the pressurizing chamber is in communication with the reservoir and the outlet through the channel defined by the rupture element to achieve the depressurization of the interior of the body.

In an exemplary embodiment, the rupture element comprises, when the piston is in the first position, a first end opposite the fragile portion and a second end projecting from the piston, the rupture element having a cavity extending between its first and second ends which defines said channel.

In this case, when the piston passes from the first to the second position, the impact of the second end with the bottom causes the displacement of the rupture element in the housing in order to break the fragile portion by impact of the latter with the first end. When the fragile portion is broken, the pressurizing chamber is in communication with the reservoir and the outlet through the cavity defined by the rupture element. In an exemplary embodiment, the cavity is an internal cavity of the rupture element.

In an exemplary embodiment, the rupture element further comprises at least a first opening located on the side of the first end and communicating with the internal cavity.

Such a characteristic advantageously allows effective depressurization even in the case where, after rupture, the fragile portion would close a portion of the internal cavity at the first end. Depressurization takes place in such a case at least through the first opening.

In an exemplary embodiment, the rupture element further comprises at least a second aperture located on the side of the second end and communicating with the internal cavity.

Such a characteristic further favors the evacuation of the pressurizing gas through, in particular, the second opening.

In an exemplary embodiment, the rupture element is further provided with a through slot extending between its first and second ends and communicating with the internal cavity.

Such a feature is advantageous insofar as the slot gives the rupture element an elasticity facilitating its insertion into the housing during the manufacture of the device. In addition, as well as the first and second openings described above, the through slot which communicates with the internal cavity further promotes the depressurization of the interior of the body.

In an exemplary embodiment, the rupture element comprises a tubular wall surrounding the internal cavity, the first and second openings being, when present, through openings formed in the tubular wall.

In an exemplary embodiment, the cavity is defined by a groove on the outer surface of the rupture element.

In an exemplary embodiment, the rupture element comprises, when the piston is in the first position, a first end facing the fragile portion and a second end projecting from the piston, said channel being defined by a volume located between the rupture element and a wall of the housing and extending between the first and second ends of the rupture element. In this case, when the piston passes from the first to the second position, the impact of the second end with the bottom causes the displacement of the rupture element in the housing in order to break the fragile portion by impact of the latter with the first end. When the fragile portion is broken, the pressurizing chamber is in communication with the reservoir and the outlet orifice via a volume defined by the rupture element and the wall of the housing.

In an exemplary embodiment, the housing comprises, when the piston is in the first position, a first part in which the rupture element is held and located on the side of the fragile portion and a second portion, located on the side of the reservoir, enlarged compared to the first part.

The presence of the second enlarged portion of the housing further promotes the evacuation of the pressurizing gas.

In an exemplary embodiment, the rupture element comprises a portion of beveled shape located opposite the fragile portion when the piston is in the first position.

Such a characteristic is advantageous because it makes it possible to obtain a break with tilting of the fragile portion and thus to prevent the latter from clogging the channel once broken.

In an exemplary embodiment, the material to be dispensed is in liquid form. Alternatively, the material to be dispensed may be in the form of foam or in powder form.

In an exemplary embodiment, the gas generator is a pyrotechnic gas generator. Alternatively, the gas generator may be a pressurized gas tank.

The present invention also provides a fire extinguisher formed by a device as described above in which the material to be delivered is an extinguishing agent. The invention is however not limited to the implementation of the device described above as extinguisher. In particular, the device described above can, alternatively, form a lubricating device in which the material to be delivered is a lubricant, such as a lubricating oil. Brief description of the drawings

Other characteristics and advantages of the invention will emerge from the following description of particular embodiments of the invention, given by way of non-limiting examples, with reference to the appended drawings, in which:

FIG. 1 represents a first example of a device according to the invention when the piston is in the first position,

FIG. 2 represents an enlarged view of the device of FIG. 1 at the level of the housing and of the rupture element,

FIG. 3 represents in isolation the breaking element implemented in the device of FIG. 1,

FIG. 4 shows the device according to the example of FIG. 1 during the distribution of the material when the piston passes from the first to the second position,

FIG. 5 represents an enlarged view of the device according to the example of FIG. 1 at the end of the distribution of the material, when the piston is in the second position;

FIGS. 6 to 11 represent, in isolation, variants of breaking elements that can be used in a device according to the invention,

FIG. 12 represents an enlarged view of a variant of the device according to the invention implementing the rupture element of FIG. 9, when the piston is in the second position,

FIG. 13 represents a piston variant that can be used in a device according to the invention, and

- Figures 14 to 16 show an alternative device according to the invention.

Detailed description of embodiments

Figure 1 shows a device 100 for dispensing a pressurized material according to a first embodiment of the invention. The piston 150 of the device 100 is represented in FIG. 1 as being in the first position, corresponding to a storage position of the material in the device 100.

The device 100 comprises a body 110 of elongate shape. The body extends along an axis A. The body 110 has an axisymmetric shape about the axis A. The body 110 is, in the illustrated example, cylindrical shape. The body 110 of the device is closed at a first end by a first base 120 on which is fixed a pyrotechnic gas generator 130, and at a second end by a second bottom 140. Alternatively, a tank of pressurized gas may be used. place of the pyrotechnic gas generator. The axis A connects the first bottom 120 to the second bottom 140 and generally corresponds to the direction of movement of the piston 150 in the body 110.

The piston 150 is present inside the body 110. When the piston 150 is in the first position, the latter defines inside the body 110 two chambers separated in a sealed manner by said piston 150, one forming a chamber pressurization 160 in which is present the gas generator 130, and the other forming a tank 170 in which is stored the material to be delivered by the device 100. The material to be delivered may for example be a liquid, a foam or a powdery material. The first bottom 120 delimits the pressurizing chamber 160. The second bottom 140 delimits, for its part, the reservoir 170.

In the illustrated example, the pyrotechnic gas generator 130 comprises a pyrotechnic charge 131 intended to generate by combustion gases for pressurizing the pressurizing chamber 160. The gas generator 130 comprises an opening 132 centered on the axis A and comprising a flared portion, through which the gases from the combustion of the load 131 can reach the pressurizing chamber 160. Such a pyrotechnic gas generator 130 is known per se, and will not be detailed here more.

The second bottom 140 of the device 100 is provided with an outlet orifice 141, consisting in the example illustrated in a through bore formed in the second bottom 140. When the piston 150 is in the first position as illustrated in FIG. the outlet orifice 141 is closed by a membrane 142 configured to break when a pressure threshold determined in the tank 170 is exceeded in order to distribute the material thus pressurized outside the device 100.

The piston 150 has an axisymmetric shape about the axis A and is, for example, as illustrated in cylindrical form. The piston 150 comprises a pressure application portion 151 extending transversely, for example perpendicularly, with respect to the axis A. In the example shown, the application portion of the pressure 151 has a disk shape. The piston 150 further comprises a skirt 152, here cylindrical, extending from the portion 151 towards the first bottom 120. Alternatively, a piston without such a skirt could be used. The portion 151 is provided with a groove 153 in which is present a seal 154, for example of toric shape, which seals between the pressurizing chamber 160 and the tank 170. The seal 154 is positioned between the portion 151 and the body 110.

A housing 155 is formed in the piston 150, in the application portion of the pressure 151. When the piston 150 is in the first position, the housing 155 is a blind housing which is closed by a fragile portion 157 on the side of the pressurizing chamber 160 and which opens into the reservoir 170. When the piston 150 is in the first position, there is no communication between the pressurizing chamber 160 and the reservoir 170. In this first position, the chamber 160 and the tank 170 are separated in a sealed manner by the piston 150 and in particular by the fragile portion 157 of the piston 150. A rupture element 180 is held in the housing 155. FIG. 2 shows more details on the housing 155 and the element when the piston 150 is in the first position.

With reference to FIG. 2, it can be seen that the housing 155 extends along an axis A1 parallel to the axis A. The fragile portion 157 is here in the form of a portion of reduced thickness. The fragile portion 157 is, in the example illustrated, formed monolithically with the application portion of the pressure 151. Thus, in the example illustrated, the pressure application portion 151 has a fragile portion 157 having a thickness less than the thickness of the portion 151 elsewhere than on said fragile portion 157. The application portion of the pressure 151 has, moreover, a first face 151a located on the side of the pressurizing chamber 160 and a second face 151b located on the side of the tank 170. The housing 155 comprises a first portion 155a in which the rupture element 180 is maintained located on the side of the fragile portion 157 and a second portion 155b flared extending from the first portion 155a and located the side of the reservoir 170. The diameter of the first portion 155a is smaller than the diameter of the second portion 155b. By "diameter", here we must understand the largest dimension cross section measured perpendicularly to the axis A1 of the housing 155. In the example shown, the second portion 155b extends gradually widening towards the reservoir 170. The second portion 155b is here in the form of a conical countersink but it is not beyond the scope of the invention when it has a different shape.

The rupture element 180 extends along a longitudinal axis corresponding to the axis A1 of the housing 155. The rupture element 180 extends between a first end 180a facing the fragile portion 157 and a second end 180b in protruding relative to the piston 150 and located in the reservoir 170. The second end 180b protrudes from the piston 150 by a non-zero distance d measured between said second end 180b and the second face 151b. Unless otherwise stated, the distance d is measured along the axis Al of the housing 155. The breaking element 180 is clamped in the first portion 155a of the housing 155. The breaking element 180 exerts a clamping force resulting from its contact with the wall of the housing 155. The clamping force exerted by the rupture element 180 in the housing 155 ensures its holding in position when the piston 150 is in the first position. The rupture element 180 can be inserted into force in the housing 155. Because of its maintenance, the rupture element 180 does not break the fragile portion 157 before actuation of the generator 130 when the material is buoyed by vibrations or shocks to the device 100. Thus the seal between the reservoir 170 and the pressurizing chamber 160 is preserved before use of the device 100.

In the configuration illustrated in FIG. 2, the first end 180a is spaced a non-zero distance from the fragile portion 157, but it would be possible in a variant that the first end 180a be in contact with the fragile portion 157 when the piston 150 is in the first position. The breaking element 180 has a length l greater than the length l ₂ of the housing 155. This feature makes it possible to ensure that the rupture element can effectively, after impact with the second bottom 140, break the fragile portion 157. Except otherwise, the lengths of the rupture element and the housing are measured along the axis A1 of the housing 155.

The breaking element 180 implemented has a split tube structure having the structure illustrated in FIG. rupture 180 comprises a tubular wall 183 defining an internal cavity 182. The internal cavity 182 is a through cavity and extends between the first end 180a and the second end 180b. The internal cavity 182 extends over the entire length li of the rupture element 180. In the example shown, this internal cavity 182 defines a channel opening into the reservoir 170. As will be illustrated hereinafter, this channel allows when the piston 150 is in the second position, communicating the pressurizing chamber 160 with the outlet orifice 141 in order to depressurize the device 100. The rupture element 180 also has at least two first openings 184a located on the side of the first end 180a. The first openings 184a are through openings formed in the tubular wall 183 which communicate with the internal cavity 182. The first openings 184a are formed in a transverse direction, for example perpendicular to the longitudinal axis of the rupture element 180. The first openings 184a are diametrically opposed in the illustrated example but other relative configurations between these first openings are conceivable within the scope of the present invention. The rupture element 180 also has at least two second openings 184b located on the side of the second end 180b. The second openings 184b are through openings formed in the tubular wall 183 which communicate with the internal cavity 182. The second openings 184b are formed in a direction transverse, for example perpendicular to the longitudinal axis of the rupture element 180. As for the first openings 184a, the second openings 184b are diametrically opposed in the illustrated example but other relative configurations are possible. The first / second openings 184a / 184b here have a substantially circular shape but other shapes are possible, such as polygonal shapes for example. In a variant not shown, the rupture element could comprise a single first / second opening. The rupture element 180 is furthermore provided with a through slot 187 (see FIG. 3) which extends between its first 180a and second 180b ends and communicates with the internal cavity 182. The through slot 187 extends over any the length li of the rupture element 180. The through slot 187 is a longitudinal slot extending along the longitudinal axis of the rupture element 180. The through slot 187 has a rectilinear shape in the illustrated example. The presence of the slot 187 is advantageous in order to impart a certain elasticity to the rupture element and thus facilitate its insertion into the housing 155. The clamping force maintaining the rupture element 180 in the housing 155 can be adapted to depending on the diameter of the split tube, the thickness of the tubular wall 183, the material used or the diameter of the housing 155.

We will now describe, in connection with Figures 4 and 5, the distribution of the material outside the device 100 and the structure obtained once the piston 150 in the second position.

FIG. 4 shows the device 100 previously described during the distribution of the material when the piston 150 moves from the first position to the second position. The gas generator 130 has just been triggered, the gases have pressurized the pressurizing chamber 160 and exert a force on the piston 150. The force exerted by the gases on the piston 150 makes it possible to move the latter towards the second bottom 140 and thus perform the distribution of the material outside the device 100 through the outlet orifice 141. The fragile portion 157 is configured not to be broken under the effect of the pressure imposed by the gas generated in the pressurizing chamber 160.

When the piston arrives in the second position at the end of the distribution of the material, the second end 180b of the rupture element 180 which protrudes from the piston 150 will come into contact with the second bottom 140. Following this impact, the element of rupture 180 will slide in the housing and its first end 180a will thus break by impact the fragile portion 157. The force exerted by the second bottom 140 on the breaking element 180 during the impact is strictly greater than the effort of now clamping the breaker member 180 in the housing 155 so that the breaker member 180 is depressed into the housing.

After impact, the structure illustrated in FIG. 5 is obtained in which the rupture element 180 is driven into the housing and has broken the fragile portion. When in the second position, the piston 150 is vis-à-vis the second bottom 140. The second face 151b of the piston may be in abutment against the second bottom 140 when the piston 150 is in the second position. The second end 180b of the rupture element 180 can be in abutment against the second bottom 140 when the piston 150 is in the second position. In the exemplary embodiment illustrated, the rupture element 180 is not located in the extension of the outlet orifice 141 but is shifted from the latter. Note however that the second enlarged portion 155b of the housing opens, when the piston 150 is in the second position, facing the outlet orifice 141. In the illustrated configuration, the second openings 184b and the slot 187 open, when the piston 150 is in the second position, in the second enlarged portion 155b of the housing 155. FIG. 5 shows the path E for evacuation of the pressurizing gases outside the device 100. These gases pass through the first openings 184a, the internal cavity 182, the through slot 187 and the second openings 184b to finally be discharged through the outlet orifice 141. As mentioned above, the presence of the first openings 184a allows effective depressurization even in the case where, after rupture, the fragile portion 157 would plug a portion of the internal cavity 182 at the first end 180a. The device thus enables automatic depressurization of the inside of the body 110 at the end of the distribution of the material. Further, when a dispensing channel (not shown) is attached to the outside of the device 100 at the outlet port 141, the contents of this material filled channel are purged by the gas escaping from the outlet. outside the device. In this way, a larger amount of material effectively participates in the desired function and the effectiveness of the device is thus improved.

Figures 6 to 11 show alternative fracture element structures that may be used in the context of the invention.

The rupture element 280 illustrated in FIG. 6 is in the form of a tube. It comprises a tubular wall 283 defining an internal cavity 282 extending between its first end 280a and its second end 280b. It is devoid of longitudinal slot but has two first openings 284a located on the side of the first end 280a and two second openings 284b located on the side of the second end 280b.

The rupture element 380 illustrated in FIG. 7 is in the form of a tube. It comprises a tubular wall 383 defining an internal cavity 382 extending between its first end 380a and its second end 380b. It is also devoid of longitudinal slot but present first two openings 384a located at the first end 380a and two second openings 384b located at the second end 380b. The first and second openings 384a and 384b are, in the illustrated example, in the form of notches.

The rupture element 480 illustrated in FIG. 8 is in the form of a tube. It comprises a tubular wall 483 defining an internal cavity 482 extending between its first end 480a and its second end 480b. It has no first and second openings but has a longitudinal slot 487. When the piston is in the second position, the evacuation of the gases to the outlet is effected at least through the longitudinal slot 487.

The rupture element 580 illustrated in FIG. 9 is in the form of a tube. It comprises a tubular wall 583 defining an internal cavity 582 extending between its first end 580a and its second end 580b. It is devoid of first and second openings as well as longitudinal slot. When the piston is in the second position, the evacuation of the gases towards the outlet orifice is effected through the internal cavity 582. Such a rupture element 580 can be used in a device of the type of that described in FIG. Figure 1 by providing the second bottom 140 of one or more reliefs forming stops to provide a space between the second face 151b of the piston 150 and the outlet orifice 141 when the piston is in the second position. In this way, even when the internal cavity 182 is not facing the outlet orifice 141 in the second position, an evacuation of the gas through this internal cavity 182 can be performed thanks to the space thus formed. The breaking element 580 can also be used in other types of device according to the invention as will be detailed below.

The rupture element 680 illustrated in FIG. 10 is in the form of a tube comprising a beveled portion at its first end 680a. In other words, the plane PI containing the first end 680a forms with the plane P2 perpendicular to the axis A1 of the rupture element a non-zero angle α. The rupture element 680 comprises a tubular wall 683 defining an internal cavity 682 extending between its first end 680a and its second end 680b. The breaking of the fragile portion with the beveled portion 680a makes it possible to obtain a rupture with tilting of the fragile portion and to avoid that the latter does not obstruct the internal cavity 682 once broken. The rupture element has no first opening but has a longitudinal slot 687 and second openings 684b. When the piston is in the second position, the evacuation of gases to the outlet orifice is effected through the internal cavity 682, the longitudinal slot 687 and the second openings 684b. One could alternatively use a breaker element with a bevelled portion as illustrated but which lacks a second aperture or the longitudinal slot.

Figure 11 illustrates a variant of rupture element 780 which does not have a tubular shape. According to this variant, the rupture element 780 comprises a longitudinal groove 782 on its outer surface 783 which defines the channel. The groove 782 extends between the first end 780a and the second end 780b and defines a cavity of the rupture element. When the piston is in the second position, the evacuation of gases to the outlet is effected through the groove 782.

FIG. 12 illustrates an alternative device according to the invention in which the housing has no enlarged second part unlike the device illustrated in FIG. 1. In the variant illustrated in FIG. 12, the breaking element 580 is such as shown in FIG. 9. The rupture element 580 has an external diameter d2 which is greater than the diameter d1 of the outlet orifice 241. Moreover, the rupture element 580 is located in the extension of the outlet port 241 when the piston 250 is in the second position. More precisely, the internal cavity 582 opens out facing the outlet orifice 241 when the piston 250 is in the second position. In this configuration, when the piston 250 arrives in the second position, the second end 580b of the tubular wall 583 comes into contact with the portion 240a of the second bottom 240 surrounding the outlet orifice 241 thereby breaking the fragile portion and the evacuation of gases from the pressurization chamber 260 along the path E through the outlet orifice 241.

FIG. 13 illustrates a piston variant 350 in the first position in which the fragile portion 357 is no longer monolithically formed with said piston 350 but is on the contrary in the form of a reported element. In the example illustrated, the rupture element 880 is held in a first housing 355 which is open on the side of the tank. The piston further comprises a second housing 352 open on the side of the pressurizing chamber 360 in which there is a nut 357 screwed to the rupture element 880. The rupture element 880 has, at its end end, a threading cooperating with a tapping formed inside the nut 357. The nut 357 closes the first housing 355 on the side of the pressurizing chamber. During the impact of the rupture element 880 with the second bottom, the rupture element dissociates from the tapping of the nut and passes through the latter to ensure the evacuation of gases. The fragile portion could alternatively be reported on the piston by welding.

FIG. 14 represents an alternative device according to the invention. In the configuration illustrated in FIG. 14, the piston 450 is in the first position. The example of Figure 14 is a case where the rupture element 980 is full and does not have a groove on its outer surface. When in the first position, the piston 450 separates the pressurizing chamber 360 from the reservoir 370. The pressure application portion 451 of the piston 450 has a blind housing 455 in which the rupture element 980 is present. The housing 455 is, in the example shown, closed on the side of the pressurizing chamber 360 by a fragile portion 457 welded to the piston 450. The housing 455 also has an opening opening into the reservoir 370. The first end 980a of the rupture element 980 is located on the side of the fragile portion 457 and the second end 980b of the rupture element 980b protrudes from the piston 450 in the reservoir 370.

In the illustrated example, the piston 450 defines clamping portions 452 intended to exert a clamping force on the rupture element 980 in order to maintain it in position in the housing 455 when the piston 450 is in the first position. As illustrated in FIG. 15, the clamping portions 452 are in the form of protruding reliefs. The reliefs 452 are distributed around the axis of the housing. The reliefs 452 may or may not be uniformly distributed around the axis of the housing. Channels 453 are located between the reliefs 452. A pair of two adjacent reliefs 452 defines a channel 453 which extends along the axis 455. Each channel 453 is located between the rupture element 980 and a wall 456 of the housing 455.

When the piston is in the second position and the first end 980a of the rupture element 980 has broken the fragile portion 457, the gas escapes along the path E through the channels 453 to be evacuated outside the device through the outlet 341 of the second bottom 340 (Figure 16).

Claims

A device (100) for dispensing a pressurized material comprising a body (110) defining a pressurizing chamber (160; 260; 360) comprising a gas generator (130) and a reservoir (170; 370) containing the material to deliver, said reservoir being delimited by a bottom (140; 240; 340) provided with an outlet (141; 241; 341), the device further comprising a piston (150; 250; 350; moving within the body (110), the piston separating the pressurizing chamber from the reservoir, ie the gas generator (130) being configured to trigger the delivery of the material outside the body (110) through the outlet port (141; 241; 341) by passing the piston from a first material storage position to a second end-of-dispensing position of the material in which the piston is facing the bottom (140; 240; 340 )

the piston (150; 250; 350; 450) having in the first position a housing (155; 355; 455) closed by a brittle portion (157; 357; 457) on the side of the pressurizing chamber (160; 260 360) and open on the side of the reservoir (170; 370), the housing containing a rupture element (180-980) held in said housing and which defines a channel opening into the reservoir, said rupture element having a length l ₁ greater than the length l ₂ of the housing and projecting from the piston so that the brittle portion (157; 357; 457) is broken by the breaking element when the piston is in the second position.

2. Device (100) according to claim 1, wherein the rupture element (180-880) comprises, when the piston is in the first position, a first end (180a-780a) facing the fragile portion and a second end (180b-780b) projecting from the piston, the rupture member having a cavity (182-782) extending between its first and second ends which defines said channel.

3. Device according to claim 2, wherein the cavity (182-682) is an internal cavity of the rupture element.

4. Device according to claim 3, wherein the rupture element further comprises at least a first aperture (184a-384a) located on the side of the first end and communicating with the internal cavity.

5. Device according to claim 3 or 4, wherein the rupture element further comprises at least one second aperture (184b-384b; 684b) located on the side of the second end and communicating with the internal cavity.

6. Device according to any one of claims 3 to 5, wherein the rupture element is further provided with a through slot (187; 487; 687) extending between its first and second ends and communicating with the internal cavity.

7. Device according to any one of claims 3 to 6, wherein the rupture element comprises a tubular wall (183-683) surrounding the internal cavity (182-682), the first and second openings being, when are present, through openings formed in the tubular wall.

8. Device according to claim 2, wherein the cavity (782) is defined by a groove on the outer surface of the rupture element (780).

9. Device according to claim 1, wherein the rupture element (980) comprises, when the piston (450) is in the first position, a first end (980a) opposite the fragile portion (457) and a second end (980b) projecting from the piston, said channel being defined by a volume (453) located between the rupture member (980) and a wall (456) of the housing and extending between the first and second ends of the breaking element.

10. Device according to any one of claims 1 to 9, wherein the housing (155) comprises, when the piston (150) is in the first position, a first portion (155a) in which the rupture element (180 ) is maintained and located on the side of the fragile portion (157) and a second portion (155b), located on the side of the reservoir, enlarged relative to the first portion (155a).

11. Device according to any one of claims 1 to 10, wherein the rupture element (680) comprises a beveled portion (680a) located opposite the fragile portion when the piston is in the first position.

12. Fire extinguisher formed by a device (100) according to any one of claims 1 to 11 wherein the material to be delivered is an extinguishing agent.