FR2470949A2 - Porous stopper for pyrotechnic device - using film of polyethylene used with aluminium film having very small central hole - Google Patents
Porous stopper for pyrotechnic device - using film of polyethylene used with aluminium film having very small central hole Download PDFInfo
- Publication number
- FR2470949A2 FR2470949A2 FR7929546A FR7929546A FR2470949A2 FR 2470949 A2 FR2470949 A2 FR 2470949A2 FR 7929546 A FR7929546 A FR 7929546A FR 7929546 A FR7929546 A FR 7929546A FR 2470949 A2 FR2470949 A2 FR 2470949A2
- Authority
- FR
- France
- Prior art keywords
- film
- membrane
- opening
- pyrotechnic device
- pierced
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 11
- 239000004698 Polyethylene Substances 0.000 title abstract description 3
- -1 polyethylene Polymers 0.000 title abstract description 3
- 229920000573 polyethylene Polymers 0.000 title abstract description 3
- 239000004411 aluminium Substances 0.000 title abstract 3
- 239000012528 membrane Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 229920001903 high density polyethylene Polymers 0.000 claims 1
- 239000004700 high-density polyethylene Substances 0.000 claims 1
- 239000008188 pellet Substances 0.000 claims 1
- 239000010408 film Substances 0.000 abstract 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000010409 thin film Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000007792 addition Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
- F42B39/20—Packages or ammunition having valves for pressure-equalising; Packages or ammunition having plugs for pressure release, e.g. meltable ; Blow-out panels; Venting arrangements
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Closures For Containers (AREA)
Abstract
Description
La présente addition concerne un perfectionne ment aux artifices pyrotechniques décrits au brevet principal
On rappelle que le brevet principal proposait de pourvoir lgenveloppe étanche, contenant la compo sition pyrotechnique produisant l'effet principal de l'artifice, d'une ouverture obturée par un bouchon poreux capable de laisser sortir de l'enveloppe les gaz dégages par les réactions chimiques parasites intervenant au cours du stockage de l'artifice (notam ment sous )2effet de l'humidité), tout en empochant l'entrée d'eau dans l'enveloppe.This addition relates to an improvement to the pyrotechnic devices described in the main patent.
It will be recalled that the main patent proposed to provide the sealed envelope, containing the pyrotechnic composition producing the main effect of the device, with an opening closed by a porous plug capable of letting the gases released by the reactions out of the envelope. parasitic chemicals intervening during the storage of the device (notably under the effect of humidity), while pocketing the entry of water into the envelope.
La présente addition concerne les mimes engins pyrotechniques qui présentent ce genre de réactions parasites, en particulier les artifices pyrotechniques éclairants, les artifices qui sont à base de magnésium ou plus généralement qui dégagent des gaz tels que de l'hydrogène en présence d'humidité. The present addition relates to the same pyrotechnic devices which exhibit this kind of parasitic reactions, in particular pyrotechnic lighting devices, devices which are based on magnesium or more generally which give off gases such as hydrogen in the presence of moisture.
Selon la présente additions le bouchon poreux est constitué de deux parties, une partie intérieure qui comprend une membrane mince semi-poreuse laissant passer l'hydrogène mais non l'eau, même à l'état de vapeur, et une partie extérieure constituée par un paillet d'aluminium percé d'un petit trou. According to the present additions, the porous plug consists of two parts, an internal part which comprises a thin semi-porous membrane allowing hydrogen but not water to pass, even in the vapor state, and an external part constituted by a aluminum flake pierced with a small hole.
Plus précisément, Si on se réfère au dessin annexé, sur lequel,
- la figure 1 représente en vue à grande échelle une partie de la tête dQun engin éclairant,
et la figure 2 une vue générale d'un engin éclairant on voit que la disposition adoptée selon la présente addition consiste à prévoir dans l'enveloppe extérieure 10 de l'engin une ouverture 12 faisant communiquer l'extérieur avec une zone intérieure (en communication avec la composition pyrotechnique non représentée) de l'enveloppe.More specifically, if we refer to the attached drawing, on which,
FIG. 1 is a large-scale view of part of the head of an illuminating machine,
and FIG. 2, a general view of an illuminating device, it can be seen that the arrangement adopted according to this addition consists in providing in the outer envelope 10 of the device an opening 12 making the outside communicate with an inside area (in communication with the pyrotechnic composition not shown) of the envelope.
L'ouverture 12 se présente sous forme d'une partie d'alésage 14 s'étendant sur une partie de l'épaisseur de ltenveloppe 10, du cEté intérieur de celle-ci, cette partie 14 étant prolongée par une partie d'alésage 16 de diamètre plus important, ellemême prolongée par une troisième partie 18 de diamètre encore plus important susceptible de recevoir un couvercle de protection serti dans cet alesage 18. The opening 12 is in the form of a bore part 14 extending over part of the thickness of the envelope 10, on the inner side thereof, this part 14 being extended by a bore part 16 of larger diameter, itself extended by a third portion 18 of even larger diameter capable of receiving a protective cover crimped in this bore 18.
Le fond de l'alésage intermédiaire 16 sert à recevoir une membrane poreuse mince, de préférence en polyéthylène à haute densité neutre (environ 1g/cm3), épaisseur environ 40 microns) de préférence non expansé et non étiré. Cette membrane 20, recouvre complètement l'alésage le plus intérieur 14. Elle est appliquée tout autour de son bord périphérique, contre l'épaulement formé par la réduction de diamètre entre l'alésage 16 et l'alésage 14, par un åointd'étanché- ité élastique, torique, 22, qui est maintenu appliqué contre cet épaulement et la membrane par une première bague annulaire 24 de demi-section axiale en forme de X, le joint étant placé entre les branches du X pour empêcher son aplatissement excessif lorsque la bague est serrée contre le joint. The bottom of the intermediate bore 16 serves to receive a thin porous membrane, preferably made of high density neutral polyethylene (approximately 1 g / cm 3), thickness approximately 40 microns) preferably unexpanded and unstretched. This membrane 20 completely covers the innermost bore 14. It is applied all around its peripheral edge, against the shoulder formed by the reduction in diameter between the bore 16 and the bore 14, by a sealed seal. - elastic, toric ity, 22, which is kept applied against this shoulder and the membrane by a first annular ring 24 of axial X-shaped half-section, the seal being placed between the branches of the X to prevent its excessive flattening when the ring is tight against the seal.
La partie annulaire de la bague 24 de l'autre c3té du joint 22, en regardant dans la direction de l t axe de l'ouverture 12, est plane. Un paillet d'aluminium 26 est posé sur cette partie plane et est recouvert sur toute sa partie périphérique par un autre joint élastique torique 28 similaire au joint 22 qui applique fermement le paillet contre la bague 24. The annular part of the ring 24 on the other side of the seal 22, looking in the direction of the axis of the opening 12, is planar. An aluminum spangle 26 is placed on this flat part and is covered over its entire peripheral part by another elastic O-ring 28 similar to the seal 22 which firmly applies the paillet against the ring 24.
Le paillet d'aluminium a une épaisseur d'environ un dixième de millimètre (pour une surface d'envi- ron I cm2) et il est percé en son centre d'un petit trou d'un diamètre de 50 microns environ
Le second joint d'étanchéité 28 est recouvert par un couvercle 30 qui est constitué par une bague similaire à la bague 24, c'est-à-dire ayant une demi section axiale en forme de L dont une branche est tournée vers l'intérieur de l'enveloppe 10 et l'autre est radiale vers l'extérieur. Cette dernière branche s'applique à la fois contre le joint élastique 28 qu'elle comprime et contre l'épaulement (qui lui sert de butée) formé par la réduction entre le diamètre de l'alésage le plus extérieur 18 et l'alésage intermé- diaire 16.The aluminum flake has a thickness of about a tenth of a millimeter (for an area of about I cm2) and it is pierced in its center with a small hole with a diameter of about 50 microns
The second seal 28 is covered by a cover 30 which is constituted by a ring similar to the ring 24, that is to say having an axial half section in the shape of an L, one branch of which faces inwards. of the envelope 10 and the other is radial towards the outside. This last branch is applied both against the elastic seal 28 which it compresses and against the shoulder (which serves as a stop) formed by the reduction between the diameter of the outermost bore 18 and the intermediate bore - diary 16.
Le couvercle 30 est serti dans l'alésage 18D le sertissage ayant pour effet de comprimer le joint torique 289 et par conséquent le joint 22 par l'inter- médiaire de la bague libre 240 La membrane 20 et le paillet d'aluminium 26 sont donc bien maintenus en place uniformément à leur périphérie par le. sertissage du couvercle 30. The cover 30 is crimped in the bore 18D, the crimping having the effect of compressing the O-ring 289 and consequently the seal 22 by means of the free ring 240 The membrane 20 and the aluminum flake 26 are therefore well held in place uniformly at their periphery by the. crimping the cover 30.
Le couvercle 30 est percé en son centre d'un trou 32 d'environ 2 mm de diamètre servant principa- lement à empêcher la pénétration d'objets de dimension supérieur à 2 mm. The cover 30 is pierced in its center with a hole 32 of approximately 2 mm in diameter, serving mainly to prevent the penetration of objects of dimension greater than 2 mm.
Le paillet d'aluminium assure la protection de la membrane 20 (fragile) contre la poussière le vieillissements l'action du soleils de la chaleur ou d'autres agents mécaniques ou chimiques corrosifs
Cependant ce paillet est percé d'un très petit trou pour assurer l'évacuation, vers l'extérieur, des gaz qui ont pu être libérés depuis la composition pyrotechnique à travers la membrane semi-poreuse. On notera que meme si ce petit trou a tendance à se boucher avec de la poussière, la simple surpression qui se produit entre la membrane et le paillet lors du dégazage permet de chasser la poussière en évacuant les gaz.The aluminum flake ensures the protection of the membrane 20 (fragile) against dust the aging the action of the suns of heat or other corrosive mechanical or chemical agents
However, this straw is pierced with a very small hole to ensure the evacuation, towards the outside, of the gases which may have been released from the pyrotechnic composition through the semi-porous membrane. Note that even if this small hole tends to become clogged with dust, the simple overpressure that occurs between the membrane and the flake during degassing makes it possible to expel the dust by evacuating the gases.
Quant à la membrane poreuse 20, elle remplit sa fonction de manière améliorée car la présence du paillet d'aluminium réduit déjà la pénétration d'humidité vers la membrane. Celle-ci laisse sortir des gaz tels que de l'hydrogène et meme de l'azote, de l'ozy- gène, des gaz rares légers, du monoxyde et du dioxyde de carbone (pour des compositions pyrotechniques qui ont tendance à dégager ces gaz) ; elle laisse même sortir de la vapeur d'eau sans cependant la laisser rentrer, probablement à cause de la surpression existant entre l'intérieur dt l'extérieur, surpression qui dilate les pores de la membrane dans un sens tel que ceux-ci permettent la sortie des gaz, y compris la vapeur d'eau, tout en s'opposant à l'entrée d'eau, liquide ou vapeur. As for the porous membrane 20, it fulfills its function in an improved manner because the presence of aluminum flake already reduces the penetration of moisture towards the membrane. This lets out gases such as hydrogen and even nitrogen, ozogen, light rare gases, carbon monoxide and dioxide (for pyrotechnic compositions which tend to release these gas); it even lets out water vapor without however letting it enter, probably because of the overpressure existing between the inside and the outside, overpressure which expands the pores of the membrane in a direction such that these allow the exit of gases, including water vapor, while opposing the entry of water, liquid or vapor.
La figure 2 représente à titre d'exemple l'implantation du système de dégazage sur une partie latérale de la tête de l'engin pyrotechnique, à côté de l'ouverture principale 34destinée à recevoir un allumeur pour la mise à feu de l'engin. FIG. 2 shows by way of example the installation of the degassing system on a lateral part of the head of the pyrotechnic device, next to the main opening 34 intended to receive an igniter for firing the device .
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7929546A FR2470949A2 (en) | 1978-11-24 | 1979-11-30 | Porous stopper for pyrotechnic device - using film of polyethylene used with aluminium film having very small central hole |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7833261A FR2442426B1 (en) | 1978-11-24 | 1978-11-24 | POROUS PLUG PYROTECHNIC ENGINE |
FR7929546A FR2470949A2 (en) | 1978-11-24 | 1979-11-30 | Porous stopper for pyrotechnic device - using film of polyethylene used with aluminium film having very small central hole |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2470949A2 true FR2470949A2 (en) | 1981-06-12 |
FR2470949B2 FR2470949B2 (en) | 1986-02-21 |
Family
ID=26220868
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7929546A Granted FR2470949A2 (en) | 1978-11-24 | 1979-11-30 | Porous stopper for pyrotechnic device - using film of polyethylene used with aluminium film having very small central hole |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2470949A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002003014A1 (en) * | 2000-07-05 | 2002-01-10 | Giat Industries | Avalanche triggering projectile |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2442426A1 (en) * | 1978-11-24 | 1980-06-20 | Lacroix Tous Artifices E | Permeable membrane - to vent a pyrotechnic fuel chamber without admitting moisture of high density polyethylene film or a sintered sheet |
-
1979
- 1979-11-30 FR FR7929546A patent/FR2470949A2/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2442426A1 (en) * | 1978-11-24 | 1980-06-20 | Lacroix Tous Artifices E | Permeable membrane - to vent a pyrotechnic fuel chamber without admitting moisture of high density polyethylene film or a sintered sheet |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002003014A1 (en) * | 2000-07-05 | 2002-01-10 | Giat Industries | Avalanche triggering projectile |
FR2811420A1 (en) * | 2000-07-05 | 2002-01-11 | Giat Ind Sa | PROJECTILE FOR TRIGGERING AVALANCHES |
US6584773B2 (en) | 2000-07-05 | 2003-07-01 | Giat Industries | Projectiles to trigger avalanches |
Also Published As
Publication number | Publication date |
---|---|
FR2470949B2 (en) | 1986-02-21 |
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