EP1275931A1 - Ignition device for small pyrotechnic charges - Google Patents
Ignition device for small pyrotechnic charges Download PDFInfo
- Publication number
- EP1275931A1 EP1275931A1 EP02291677A EP02291677A EP1275931A1 EP 1275931 A1 EP1275931 A1 EP 1275931A1 EP 02291677 A EP02291677 A EP 02291677A EP 02291677 A EP02291677 A EP 02291677A EP 1275931 A1 EP1275931 A1 EP 1275931A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductive
- charge
- pyrotechnic charge
- pyrotechnic
- ignition device
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C19/00—Details of fuzes
- F42C19/08—Primers; Detonators
- F42C19/12—Primers; Detonators electric
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C19/00—Details of fuzes
- F42C19/08—Primers; Detonators
- F42C19/085—Primers for caseless ammunition
Definitions
- the technical field of the invention is that of devices for igniting pyrotechnic charges, and especially those involving a device heating.
- the ignition devices according to the invention are particularly suitable for pyrotechnic charges of small size like, for example, those which are involved in microvalves or micropumps and which are described in patent FR 2 774 684. These charges small pyrotechnics can also be find in other areas of application such as micro-propulsion for positioning satellites, fuel cells, or micro-heaters.
- Charge ignition devices pyrotechnics including a heating device already exist and have been the subject of numerous patents.
- One of the most commonly used is the device involving a conventional resistive heating element, like a hot wire powered by an electric current.
- conductive fluid is meant materials such than conductive ink, paint or varnish.
- the ignition device according to the invention remains efficient at low energy, without causing damage particular to the parts or walls constituting the immediate environment of the charge.
- the object of the present invention relates to a device for igniting a solid pyrotechnic charge, comprising a conductive track characterized in that said track is constituted by a conductive fluid at least partially deposited on the load pyrotechnic.
- the device ignition is intimately linked to the pyrotechnic charge and remains completely independent of the environment immediate of said charge.
- the conductive fluid is deposited by serigraphy.
- the conductive fluid is an ink conductive and the conductive track is produced by jet of said ink.
- the pyrotechnic charge is deposited on a solid support and the track conductive is in contact only with said load.
- the support comprises a cavity and the pyrotechnic charge, which is in the form of a film, covers said cavity.
- the pyrotechnic charge is based on nitrocellulose.
- the cavity constitutes a free space between the charge pyrotechnic and support, further reducing plus any heat exchange by conduction between these two elements.
- This configuration is particularly suitable for very small objects not exceeding a few millimeters, since at these orders of magnitude, the pyrotechnic charge can be deposited on the cavity in the form of a drop which will spread thanks to the film-forming capacity of said charge.
- the invention also relates to a method of creation of a charge ignition device pyrotechnic, characterized in that the deposition of the fluid conductor is carried directly on the load pyrotechnic.
- the deposit is produced by screen printing.
- the conductive fluid is a conductive ink and the deposit is produced by spraying said ink.
- the ignition devices according to the invention have the advantage of being able to be manufactured in large series thanks to their great simplicity of implementation artwork. In addition, they provide great flexibility according to the characteristics of the pyrotechnic charge, whether at its composition or at the level of its geometry. Indeed, in depending on the texture of the filler, the fluid conductor can be more or less thick and depending on the type of ignition sought, the conductive track can take a particular form and be more or less spread. Finally, the pyrotechnic charge and the track conductive form a monobloc and autonomous unit, which can be integrated as is in a microcircuit preexisting.
- Figure 1 is a sectional view of a device ignition according to the invention for a support having a cavity.
- Figure 2 is a top view of the device Figure 1.
- the charge pyrotechnic 1, which contains nitrocellulose is deposited on a cylindrical cavity 4 of 1.5mm diameter, hollowed out in a polycarbonate support 3.
- the charge 1 is found in the form of a discoid film whose thickness of 5 ⁇ m could be between 1 and 100 ⁇ m.
- the conductive track 2 results from the deposition of a conductive inkjet ink directly on the load 1 and, ideally, said load 1 which covers fully the cavity 4, fits between the support 3 and said track 2.
- the conductive track 2 has the form a thin strip a few ⁇ m thick, crossing the load 1 according to one of its diameters. A such a configuration minimizes losses thermal conduction through the support 3.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Ink Jet (AREA)
- Air Bags (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Machines For Laying And Maintaining Railways (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
Le domaine technique de l'invention est celui des
dispositifs d'allumage de charges pyrotechniques, et
plus spécialement ceux faisant intervenir un dispositif
chauffant. Les dispositifs d'allumage selon l'invention
sont particulièrement adaptés aux charges pyrotechniques
de petite taille comme, par exemple, celles qui sont
impliquées dans les microvannes ou micropompes et qui
sont décrites dans le brevet FR 2 774 684. Ces charges
pyrotechniques de petite taille peuvent également se
retrouver dans d'autres domaines d'application tels que
la micro-propulsion pour le positionnement de
satellites, les piles à combustibles, ou les micro-réchauffeurs.The technical field of the invention is that of
devices for igniting pyrotechnic charges, and
especially those involving a device
heating. The ignition devices according to the invention
are particularly suitable for pyrotechnic charges
of small size like, for example, those which are
involved in microvalves or micropumps and which
are described in
Les dispositifs d'allumage de charges pyrotechniques comprenant un dispositif chauffant existent déjà et ont fait l'objet de nombreux brevets. L'un des plus couramment utilisés est le dispositif impliquant un élément résistif chauffant conventionnel, comme un fil chaud alimenté par un courant électrique. Mais actuellement, il n'existe pas de dispositifs d'allumage réalisés à partir du dépôt d'un fluide conducteur directement sur la charge pyrotechnique. Il faut entendre par fluide conducteur des matériaux tels que encre conductrice, peinture ou vernis.Charge ignition devices pyrotechnics including a heating device already exist and have been the subject of numerous patents. One of the most commonly used is the device involving a conventional resistive heating element, like a hot wire powered by an electric current. But currently, there are no devices ignition produced from the deposition of a fluid conductor directly on the pyrotechnic charge. he by conductive fluid is meant materials such than conductive ink, paint or varnish.
L'un des problèmes rencontrés lors de l'allumage de charges pyrotechniques de petite taille est celui lié aux pertes thermiques par conduction. En effet, les charges et le fil chaud sont généralement au contact d'un support solide et une partie de la chaleur dégagée par le fil, est dissipée dans le support, rendant difficile voire impossible l'allumage desdites charges. La fourniture d'un surcroít d'énergie est alors requise, avec pour conséquence, un réchauffement significatif du support, non systématiquement recherché.One of the problems encountered when switching on small pyrotechnic charges is the one linked thermal losses by conduction. Indeed, the charges and hot wire are usually in contact solid support and some of the heat given off by the wire, is dissipated in the support, making difficult or impossible ignition of said charges. The supply of additional energy is then required, with the consequence, a significant warming of the support, not systematically sought.
Le dispositif d'allumage selon l'invention reste efficace à faible énergie, sans entraíner de dommages particuliers aux pièces ou parois constituant l'environnement immédiat de la charge.The ignition device according to the invention remains efficient at low energy, without causing damage particular to the parts or walls constituting the immediate environment of the charge.
L'objet de la présente invention concerne un dispositif d'allumage d'une charge pyrotechnique solide, comprenant une piste conductrice caractérisé en ce que ladite piste est constituée par un fluide conducteur déposé au moins partiellement sur la charge pyrotechnique. De cette manière, le dispositif d'allumage est intimement lié à la charge pyrotechnique et demeure totalement indépendant de l'environnement immédiat de ladite charge.The object of the present invention relates to a device for igniting a solid pyrotechnic charge, comprising a conductive track characterized in that said track is constituted by a conductive fluid at least partially deposited on the load pyrotechnic. In this way, the device ignition is intimately linked to the pyrotechnic charge and remains completely independent of the environment immediate of said charge.
Selon un premier mode de réalisation préféré de l'invention le fluide conducteur est déposé par sérigraphie.According to a first preferred embodiment of the invention the conductive fluid is deposited by serigraphy.
Selon un deuxième mode de réalisation préféré de l'invention, le fluide conducteur est une encre conductrice et la piste conductrice est réalisée par jet de ladite encre. Ces deux techniques sont largement éprouvées dans le domaine de la microélectronique et notamment dans l'élaboration de microcircuits conducteurs. Avantageusement, la charge pyrotechnique est déposée sur un support solide et la piste conductrice n'est au contact que de ladite charge. Ainsi, toute l'énergie dissipée par effet joule est intégralement transmise à la charge pyrotechnique sans échanges thermiques avec le support. De façon préférentielle, le support comporte une cavité et la charge pyrotechnique, qui se présente sous la forme d'un film, recouvre ladite cavité. Préférentiellement, la charge pyrotechnique est à base de nitrocellulose. La cavité constitue un espace libre entre la charge pyrotechnique et le support, réduisant encore un peu plus tout échange thermique par conduction entre ces deux éléments. Cette configuration est particulièrement adaptée aux objets de très petite taille n'excédant pas quelques millimètres, puisqu'à ces ordres de grandeur, la charge pyrotechnique peut être déposée sur la cavité sous la forme d'une goutte qui va s'étaler grâce à la capacité filmogène de ladite charge.According to a second preferred embodiment of the invention, the conductive fluid is an ink conductive and the conductive track is produced by jet of said ink. These two techniques are largely proven in the field of microelectronics and especially in the development of microcircuits conductors. Advantageously, the pyrotechnic charge is deposited on a solid support and the track conductive is in contact only with said load. Thus, all the energy dissipated by the joule effect is fully transmitted to the pyrotechnic charge without heat exchanges with the support. In a way preferential, the support comprises a cavity and the pyrotechnic charge, which is in the form of a film, covers said cavity. Preferably, the pyrotechnic charge is based on nitrocellulose. The cavity constitutes a free space between the charge pyrotechnic and support, further reducing plus any heat exchange by conduction between these two elements. This configuration is particularly suitable for very small objects not exceeding a few millimeters, since at these orders of magnitude, the pyrotechnic charge can be deposited on the cavity in the form of a drop which will spread thanks to the film-forming capacity of said charge.
L'invention porte également sur un procédé de réalisation d'un dispositif d'allumage d'une charge pyrotechnique, caractérisé en ce que le dépôt du fluide conducteur est réalisé directement sur la charge pyrotechnique. Selon un premier mode de réalisation préféré du procédé selon l'invention, le dépôt est réalisé par sérigraphie. Selon un deuxième mode de réalisation préféré du procédé selon l'invention, le fluide conducteur est une encre conductrice et le dépôt est réalisé par jet de ladite encre.The invention also relates to a method of creation of a charge ignition device pyrotechnic, characterized in that the deposition of the fluid conductor is carried directly on the load pyrotechnic. According to a first embodiment preferred method according to the invention, the deposit is produced by screen printing. According to a second mode of preferred implementation of the method according to the invention, the conductive fluid is a conductive ink and the deposit is produced by spraying said ink.
Les dispositifs d'allumage selon l'invention présentent l'avantage de pouvoir être fabriqués en grande série grâce à leur grande simplicité de mise en oeuvre. De plus, ils octroient une grande souplesse d'utilisation en fonction des caractéristiques de la charge pyrotechnique, que ce soit au niveau de sa composition ou au niveau de sa géométrie. En effet, en fonction de la texture de la charge, le fluide conducteur peut être plus ou moins épais et suivant le type d'allumage recherché, la piste conductrice peut revêtir une forme particulière et être plus ou moins étalée. Enfin, la charge pyrotechnique et la piste conductrice forment un ensemble monobloc et autonome, qui peut être intégré tel quel dans un microcircuit préexistant.The ignition devices according to the invention have the advantage of being able to be manufactured in large series thanks to their great simplicity of implementation artwork. In addition, they provide great flexibility according to the characteristics of the pyrotechnic charge, whether at its composition or at the level of its geometry. Indeed, in depending on the texture of the filler, the fluid conductor can be more or less thick and depending on the type of ignition sought, the conductive track can take a particular form and be more or less spread. Finally, the pyrotechnic charge and the track conductive form a monobloc and autonomous unit, which can be integrated as is in a microcircuit preexisting.
On donne ci-après la description détaillée d'un mode de réalisation préféré d'un dispositif d'allumage selon l'invention en se référant aux figures 1 et 2.A detailed description is given below of preferred embodiment of an ignition device according to the invention with reference to Figures 1 and 2.
La figure 1 est une vue en coupe d'un dispositif d'allumage selon l'invention pour un support présentant une cavité.Figure 1 is a sectional view of a device ignition according to the invention for a support having a cavity.
La figure 2 est une vue du dessus du dispositif d'allumage de la figure 1.Figure 2 is a top view of the device Figure 1.
En se référant aux figures 1 et 2, la charge
pyrotechnique 1, qui contient de la nitrocellulose est
déposée sur une cavité 4 cylindrique de 1,5mm de
diamètre, creusée dans un support 3 en polycarbonate. La
charge 1 se retrouve sous la forme d'un film discoïdal
dont l'épaisseur de 5µm pourrait être comprise entre 1
et 100µm. La piste conductrice 2 résulte du dépôt d'une
encre conductrice par jet d'encre directement sur la
charge 1 et, idéalement, ladite charge 1 qui recouvre
intégralement la cavité 4, s'insère entre le support 3
et ladite piste 2. La piste conductrice 2 a la forme
d'une fine lamelle de quelques µm d'épaisseur,
traversant la charge 1 selon l'un de ses diamètres. Une
telle configuration permet de minimiser les pertes
thermiques par conduction à travers le support 3.Referring to Figures 1 and 2, the charge
pyrotechnic 1, which contains nitrocellulose is
deposited on a
Le mode de fonctionnement de ce type d'allumage
reste conventionnel. Un courant électrique est délivré
dans la piste conductrice 2 qui s'élève aussitôt en
température. La chaleur ainsi libérée par effet joule
est directement transmise à la charge 1 qui s'enflamme
et génère des gaz pouvant actionner des
micropyromécanismes.The mode of operation of this type of ignition
remains conventional. An electric current is delivered
in the
Claims (9)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0109376A FR2827377B1 (en) | 2001-07-13 | 2001-07-13 | IGNITION DEVICE FOR PYROTECHNIC MICROCHARGES |
| FR0109376 | 2001-07-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1275931A1 true EP1275931A1 (en) | 2003-01-15 |
| EP1275931B1 EP1275931B1 (en) | 2006-07-05 |
Family
ID=8865486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02291677A Expired - Lifetime EP1275931B1 (en) | 2001-07-13 | 2002-07-05 | Ignition device for small pyrotechnic charges |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6666140B2 (en) |
| EP (1) | EP1275931B1 (en) |
| JP (1) | JP3679386B2 (en) |
| AT (1) | ATE332486T1 (en) |
| DE (1) | DE60212905T2 (en) |
| ES (1) | ES2266424T3 (en) |
| FR (1) | FR2827377B1 (en) |
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- 2002-07-05 EP EP02291677A patent/EP1275931B1/en not_active Expired - Lifetime
- 2002-07-05 DE DE60212905T patent/DE60212905T2/en not_active Expired - Lifetime
- 2002-07-05 ES ES02291677T patent/ES2266424T3/en not_active Expired - Lifetime
- 2002-07-05 AT AT02291677T patent/ATE332486T1/en not_active IP Right Cessation
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| US3815507A (en) * | 1970-01-21 | 1974-06-11 | Olin Corp | Electrical initiator |
| US4213392A (en) * | 1972-01-28 | 1980-07-22 | Hubert Usel | Electrically ignitable cartridge-less bullet |
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| CN110183291A (en) * | 2019-06-10 | 2019-08-30 | 中国工程物理研究院化工材料研究所 | A method of improving composite explosives heating conduction |
| CN110183291B (en) * | 2019-06-10 | 2021-03-16 | 中国工程物理研究院化工材料研究所 | Method for improving thermal conductivity of mixed explosive |
Also Published As
| Publication number | Publication date |
|---|---|
| DE60212905D1 (en) | 2006-08-17 |
| US6666140B2 (en) | 2003-12-23 |
| ATE332486T1 (en) | 2006-07-15 |
| JP2003050100A (en) | 2003-02-21 |
| ES2266424T3 (en) | 2007-03-01 |
| DE60212905T2 (en) | 2007-01-25 |
| JP3679386B2 (en) | 2005-08-03 |
| US20030010243A1 (en) | 2003-01-16 |
| FR2827377A1 (en) | 2003-01-17 |
| FR2827377B1 (en) | 2003-12-05 |
| EP1275931B1 (en) | 2006-07-05 |
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