EP1275931A1 - Anzündvorrichtung für kleine Treibladungen - Google Patents

Anzündvorrichtung für kleine Treibladungen Download PDF

Info

Publication number: EP1275931A1
Authority: EP; European Patent Office
Prior art keywords: conductive; charge; pyrotechnic charge; pyrotechnic; ignition device
Prior art date: 2001-07-13
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

Application number

EP02291677A

Other languages

English (en)

French (fr)

Other versions

EP1275931B1 (de

Inventor

Denis Roller

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Safran Ceramics SA

Original Assignee

Societe Nationale des Poudres et Explosifs

Priority date (The priority date 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 date listed.)

2001-07-13

Filing date

2002-07-05

Publication date

2003-01-15

2002-07-05 Application filed by Societe Nationale des Poudres et Explosifs filed Critical Societe Nationale des Poudres et Explosifs

2003-01-15 Publication of EP1275931A1 publication Critical patent/EP1275931A1/de

2006-07-05 Application granted granted Critical

2006-07-05 Publication of EP1275931B1 publication Critical patent/EP1275931B1/de

2022-07-05 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

Images

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)
Inks, Pencil-Leads, Or Crayons (AREA)
Air Bags (AREA)
Ignition Installations For Internal Combustion Engines (AREA)
Machines For Laying And Maintaining Railways (AREA)

EP02291677A 2001-07-13 2002-07-05 Anzündvorrichtung für kleine Treibladungen Expired - Lifetime EP1275931B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
FR0109376		2001-07-13
FR0109376A FR2827377B1 (fr)	2001-07-13	2001-07-13	Dispositif d'allumage pour microcharges pyrotechniques

Publications (2)

Publication Number	Publication Date
EP1275931A1 true EP1275931A1 (de)	2003-01-15
EP1275931B1 EP1275931B1 (de)	2006-07-05

Family

ID=8865486

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP02291677A Expired - Lifetime EP1275931B1 (de)	2001-07-13	2002-07-05	Anzündvorrichtung für kleine Treibladungen

Country Status (7)

Country	Link
US (1)	US6666140B2 (de)
EP (1)	EP1275931B1 (de)
JP (1)	JP3679386B2 (de)
AT (1)	ATE332486T1 (de)
DE (1)	DE60212905T2 (de)
ES (1)	ES2266424T3 (de)
FR (1)	FR2827377B1 (de)

Cited By (1)

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EP0076210A1 (de) *	1981-09-28	1983-04-06	ETAT-FRANCAIS représenté par le Délégué Général pour l' Armement	Elektrische Brückenzünder für pyrotechnische Ladungen
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2001
- 2001-07-13 FR FR0109376A patent/FR2827377B1/fr not_active Expired - Fee Related
2002
- 2002-06-20 US US10/175,067 patent/US6666140B2/en not_active Expired - Fee Related
- 2002-07-05 DE DE60212905T patent/DE60212905T2/de not_active Expired - Lifetime
- 2002-07-05 AT AT02291677T patent/ATE332486T1/de not_active IP Right Cessation
- 2002-07-05 ES ES02291677T patent/ES2266424T3/es not_active Expired - Lifetime
- 2002-07-05 EP EP02291677A patent/EP1275931B1/de not_active Expired - Lifetime
- 2002-07-12 JP JP2002204420A patent/JP3679386B2/ja not_active Expired - Fee Related

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CN110183291A (zh) *	2019-06-10	2019-08-30	中国工程物理研究院化工材料研究所	一种提高混合炸药导热性能的方法
CN110183291B (zh) *	2019-06-10	2021-03-16	中国工程物理研究院化工材料研究所	一种提高混合炸药导热性能的方法

Also Published As

Publication number	Publication date
DE60212905D1 (de)	2006-08-17
FR2827377A1 (fr)	2003-01-17
JP2003050100A (ja)	2003-02-21
ATE332486T1 (de)	2006-07-15
FR2827377B1 (fr)	2003-12-05
ES2266424T3 (es)	2007-03-01
JP3679386B2 (ja)	2005-08-03
US6666140B2 (en)	2003-12-23
EP1275931B1 (de)	2006-07-05
DE60212905T2 (de)	2007-01-25
US20030010243A1 (en)	2003-01-16

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2002-11-29	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
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