EP2554529A1 - Sicherheitszünder - Google Patents

Sicherheitszünder Download PDF

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Publication number
EP2554529A1
EP2554529A1 EP12174520A EP12174520A EP2554529A1 EP 2554529 A1 EP2554529 A1 EP 2554529A1 EP 12174520 A EP12174520 A EP 12174520A EP 12174520 A EP12174520 A EP 12174520A EP 2554529 A1 EP2554529 A1 EP 2554529A1
Authority
EP
European Patent Office
Prior art keywords
thermal insulation
detonator
stage
explosive
plate
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
Application number
EP12174520A
Other languages
English (en)
French (fr)
Other versions
EP2554529B1 (de
Inventor
Hervé Le Breton
Nathalie Raffin-Barril
Didier Cazajous
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.)
Nexter Munitions SA
Original Assignee
Nexter Munitions SA
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.)
Filing date
Publication date
Application filed by Nexter Munitions SA filed Critical Nexter Munitions SA
Publication of EP2554529A1 publication Critical patent/EP2554529A1/de
Application granted granted Critical
Publication of EP2554529B1 publication Critical patent/EP2554529B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D5/00—Safety arrangements
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C7/00—Non-electric detonators; Blasting caps; Primers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/113—Initiators therefor activated by optical means, e.g. laser, flashlight
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents

Definitions

  • the technical field of the invention is that of detonators plate or projected element.
  • This type of detonator as described in the patent US6374740 comprises a body in which there is a first stage, or inflammatory stage, comprising at least a first pyrotechnic composition or an explosive secondary explosive.
  • a relay stage comprising at least one secondary explosive.
  • the first composition may be initiated by an optical means such as an optical fiber or an electrical means (hot wire) while the secondary explosive is initiatable by an impact.
  • a thin plate metal or plastic
  • the plate is projected onto the secondary explosive which will then be initiated following the energy of the shock provided by the plate.
  • This operation has a disadvantage from the point of view of safety.
  • the first composition may react and cause the projection of the plate and thereby the reaction of the secondary explosive and the whole of the pyrotechnic chain.
  • the invention proposes to reduce the sensitivity to the temperature rise of the igniter stage.
  • the subject of the invention is a detonator comprising a plate projected by an igniting stage comprising at least less a first pyrotechnic composition and / or a first explosive, plate projected on a relay stage comprising at least one secondary explosive, detonator characterized in that it comprises a thermal insulation means surrounding the igniter stage to delay its temperature rise .
  • the thermal insulation means comprises a casing made of a ceramic material.
  • the thermal insulation means comprises an envelope made of a plastic or composite material.
  • the thermal insulation means associates an envelope made of a first thermal insulating material and closed by a plug made of a second thermal insulating material.
  • the material or materials constituting the thermal insulation means have a thermal conductivity lower than 0, 24W.m -1 .K -1 .
  • the thickness of the insulating means will preferably be greater than 0.5 mm.
  • the first pyrotechnic composition or the first explosive of the igniter stage is in contact with the end of an optical fiber.
  • a detonator 1 comprises a substantially cylindrical body 2 having three parts 2a, 2b and 2c.
  • the central portion 2b of the body has an external thread 2d for securing the detonator with a mounting for receiving such a munition (assembly not shown).
  • a sheathed optical fiber 3 passes through the rear part 2a of the body.
  • the optical fiber 3 opens into an ignition stage 10 in contact with a first photosensitive pyrotechnic composition 4.
  • a first photosensitive pyrotechnic composition 4 is described by the patent FR2914056 .
  • a composition combining zirconium and potassium perchlorate is conventional and it is not necessary to describe it in more detail.
  • Other types of pyrotechnic compositions may be used such as: boron / potassium nitrate, boron / zirconium / potassium nitrate, etc.
  • the secondary explosive may be pure or incorporate an optical dopant as described by the patent EP1742009 .
  • a layer of pyrotechnic ignition composition (such as a zirconium / potassium perchlorate composition) in contact with the optical fiber 3 and associated with the optical fiber 3 will be associated with the level of the igniter stage 10.
  • a layer of a secondary explosive explosion for example octogen.
  • the patent EP1306643 describes such an association of an ignition composition and a secondary explosive.
  • the igniter stage 10 comprises a first composition (and / or a secondary explosion explosive) having a particle size perfectly controlled and relatively reduced (less than or equal to 60 micrometers).
  • This first pyrotechnic composition is loaded into a case 5 which is enveloped by a thermal insulation means 12.
  • This thermal insulation means 12 comprises a casing made of a ceramic material, a plastic or composite material.
  • the plastic used may for example be a thermoplastic type polyamide PA66.
  • a ceramic material may for example be based on silica and selected from ceramics having a high thermal resistance. Ceramic is preferred because, due to its porosity, its natural thermal insulation qualities are important.
  • the igniter stage thus constituted comprises a projectable metal plate 6 (also referred to herein as the projected element 6) placed on the ceramic coating on the outside thereof, opposite to the optical fiber 3.
  • the screwing of the rear portion 2a on the central portion 2b allows to apply the bottom of the igniter stage 10 (covered by the insulating means 12) against the plate 6 which is then pinched between the insulator 12 and the front portion 2c of the body.
  • the igniter stage is thus maintained in position thanks to a threading 9 solidarisant the rear part of the body 2a at the central part of the body 2b.
  • the metal plate 6 is supported by its periphery on a shoulder of the front portion 2c of the body 2.
  • a secondary explosive 7 sensitive to shock which forms a relay stage.
  • the distance D will be chosen by those skilled in the art as being that which makes it possible to obtain the optimal projection speed at the shock release of the secondary explosive 7 by virtue of the characteristics of the igniter stage 10, and therefore especially of the nature and the mass of the first composition 4 and the mass of the plate 6 and that of the insulating means 12.
  • a light beam is conveyed by the optical fiber 3 to the first pyrotechnic composition 4 (ignition stage). This reacts in explosion causing the projected metal plate 6 to project to the secondary explosive 7 (relay stage). The shock then causes the detonation of the latter which causes the reaction of the sequence of the pyrotechnic chain (pyrotechnic chain not shown) associated with the assembly receiving the detonator.
  • the invention proposes that the igniter stage 10 is sufficiently thermally insulated by the thermal insulation means 12 so that it is protected from heat or it does not burns or blows only after the secondary explosive 7 of the front part 2c of the detonator 2 has itself been burned or deflagrated.
  • the skilled person will determine the minimum thickness E (thickness ranging from 0.5 to 2 mm, thickness better visible at the figure 2 ) of the insulating means 12 to ensure a sufficient time lag between the arrival at a given temperature level outside and the arrival at the same level inside the insulating means 12.
  • the thickness will be chosen such that there is a time lag of at least 30 seconds between the instant when the temperature outside the insulation means 12 is 230 ° C. and the instant when the temperature at the inside of the insulating means 12 is 230 ° C.
  • the primary pyrotechnic composition 4 being during this interval protected by the thermal insulation means, it does not react. Beyond 30 seconds, she can then react without fear of triggering a detonation.
  • the thermal insulation means may associate an envelope 12a made of a first thermal insulating material and closed by a plug 12b made of a second thermal insulating material.
  • the envelope 12a receiving the pyrotechnic composition may for example be made of ceramic material and the plug 12b may be made of plastic.
  • the ceramic is very fragile, the use of a plastic plug allows to seal all without risk of cracking.
  • the loaded case 5, or directly loading secondary explosive 4 in the case where no case is used can be covered ceramic by sintering for example.
  • the invention has been described with an igniter stage initiated by an optical fiber, but the invention can also be implemented with an igniter stage initiated in a more conventional manner by electrical energy, for example a hot-wire igniter. or exploded wire.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Air Bags (AREA)
EP12174520.2A 2011-08-01 2012-06-29 Sicherheitszünder Active EP2554529B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1102413A FR2978762B1 (fr) 2011-08-01 2011-08-01 Detonateur de securite

Publications (2)

Publication Number Publication Date
EP2554529A1 true EP2554529A1 (de) 2013-02-06
EP2554529B1 EP2554529B1 (de) 2014-02-26

Family

ID=46319663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12174520.2A Active EP2554529B1 (de) 2011-08-01 2012-06-29 Sicherheitszünder

Country Status (3)

Country Link
US (1) US8915188B2 (de)
EP (1) EP2554529B1 (de)
FR (1) FR2978762B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11131530B2 (en) 2018-01-29 2021-09-28 Lawrence Livermore National Security, Llc Opto-thermal laser detonator

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4312271A (en) * 1976-07-08 1982-01-26 Systems, Science And Software Delay detonator device
US4365558A (en) * 1978-12-15 1982-12-28 Societe Nationale Des Poudres Et Explosifs Combustible objects, in particular combustible cartridge cases, which are heat-resistant
US4671177A (en) * 1986-03-03 1987-06-09 Unidynamics Phoenix, Inc. Temperature resistant detonator
US4766812A (en) * 1986-11-13 1988-08-30 L'etat Francais Represente Par Le Delegue Ministeriel Pour L'armement Varnish protecting a caseless or combustible-case round of ammunition against thermoinitiation
US4907509A (en) * 1988-07-01 1990-03-13 The United States Of America As Represented By The United States Department Of Energy Bonfire-safe low-voltage detonator
FR2659137A1 (fr) * 1990-03-01 1991-09-06 France Etat Armement Initiateur pyrotechnique laser a fibre optique.
FR2692346A1 (fr) * 1992-06-16 1993-12-17 Davey Bickford Amorce optique de générateur pyrotechnique à basse énergie.
US6374740B1 (en) 1999-07-06 2002-04-23 Institut Franco-Allemand De Recherches De Saint-Louis Two-stage optical detonator with shock-detonation transition
EP1306643A1 (de) 2001-10-26 2003-05-02 I.S.L. Institut Franco-Allemand de Recherches de Saint-Louis Optischer Zünder mit niedriger Energie
EP1742009A1 (de) 2005-07-05 2007-01-10 Institut Franco-Allemand de Recherches de Saint-Louis Sprengstoffzusammemsetzung zur thermischer Zündung mittels einer Laserquelle und Zündvorrichtung dafür
FR2914056A1 (fr) 2007-03-21 2008-09-26 Nexter Munitions Sa Initiateur opto pyrotechnique

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062143A (en) * 1959-11-02 1962-11-06 Armour Res Found Detonator
US6487971B1 (en) * 1968-10-12 2002-12-03 The United States Of America As Represented By The Secretary Of The Navy Light initiated detonator
US3791302A (en) * 1972-11-10 1974-02-12 Leod I Mc Method and apparatus for indirect electrical ignition of combustible powders
GB2056633B (en) * 1979-08-21 1983-05-11 Sightworth Ltd Detonation of explosive charges
US4602565A (en) * 1983-09-26 1986-07-29 Reynolds Industries Inc. Exploding foil detonator
US4898095A (en) * 1986-10-20 1990-02-06 Nippon Oil And Fats Company, Limited And Kajima Corporation Laser beam-detonatable blasting cap
US5029528A (en) * 1990-04-02 1991-07-09 The United States Of America As Represented By The United States Department Of Energy Fiber optic mounted laser driven flyer plates
FR2669725B1 (fr) * 1990-11-27 1994-10-07 Thomson Brandt Armements Detonateur pyrotechnique a connexions coaxiales.
US5275106A (en) * 1992-06-11 1994-01-04 The United States Of America As Represented By The United States Department Of Energy Insensitive fuze train for high explosives
US6047643A (en) * 1997-12-12 2000-04-11 Eg&G Star City, Inc. Hermetically sealed laser actuator/detonator and method of manufacturing the same
DE19837839A1 (de) * 1998-08-20 2000-02-24 Dynamit Nobel Ag Zündelement mit einer Laserlichtquelle
FR2796166B1 (fr) * 1999-07-06 2003-05-30 Saint Louis Inst Allumeur optique a barreau en verre a gradient d'indice
US6758922B2 (en) * 2001-10-05 2004-07-06 Autoliv Asp, Inc. Low firing energy initiator pyrotechnic mixture
US8276516B1 (en) * 2008-10-30 2012-10-02 Reynolds Systems, Inc. Apparatus for detonating a triaminotrinitrobenzene charge

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4312271A (en) * 1976-07-08 1982-01-26 Systems, Science And Software Delay detonator device
US4365558A (en) * 1978-12-15 1982-12-28 Societe Nationale Des Poudres Et Explosifs Combustible objects, in particular combustible cartridge cases, which are heat-resistant
US4671177A (en) * 1986-03-03 1987-06-09 Unidynamics Phoenix, Inc. Temperature resistant detonator
US4766812A (en) * 1986-11-13 1988-08-30 L'etat Francais Represente Par Le Delegue Ministeriel Pour L'armement Varnish protecting a caseless or combustible-case round of ammunition against thermoinitiation
US4907509A (en) * 1988-07-01 1990-03-13 The United States Of America As Represented By The United States Department Of Energy Bonfire-safe low-voltage detonator
FR2659137A1 (fr) * 1990-03-01 1991-09-06 France Etat Armement Initiateur pyrotechnique laser a fibre optique.
FR2692346A1 (fr) * 1992-06-16 1993-12-17 Davey Bickford Amorce optique de générateur pyrotechnique à basse énergie.
US6374740B1 (en) 1999-07-06 2002-04-23 Institut Franco-Allemand De Recherches De Saint-Louis Two-stage optical detonator with shock-detonation transition
EP1306643A1 (de) 2001-10-26 2003-05-02 I.S.L. Institut Franco-Allemand de Recherches de Saint-Louis Optischer Zünder mit niedriger Energie
EP1742009A1 (de) 2005-07-05 2007-01-10 Institut Franco-Allemand de Recherches de Saint-Louis Sprengstoffzusammemsetzung zur thermischer Zündung mittels einer Laserquelle und Zündvorrichtung dafür
FR2914056A1 (fr) 2007-03-21 2008-09-26 Nexter Munitions Sa Initiateur opto pyrotechnique

Also Published As

Publication number Publication date
US8915188B2 (en) 2014-12-23
FR2978762A1 (fr) 2013-02-08
FR2978762B1 (fr) 2013-08-02
US20140109787A1 (en) 2014-04-24
EP2554529B1 (de) 2014-02-26

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