EP2103896B1 - Flugscheibe und solche Flugscheibe umfassender Slappper-Zünder ohne Initialsprengstoff - Google Patents

Flugscheibe und solche Flugscheibe umfassender Slappper-Zünder ohne Initialsprengstoff Download PDF

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Publication number
EP2103896B1
EP2103896B1 EP20090155743 EP09155743A EP2103896B1 EP 2103896 B1 EP2103896 B1 EP 2103896B1 EP 20090155743 EP20090155743 EP 20090155743 EP 09155743 A EP09155743 A EP 09155743A EP 2103896 B1 EP2103896 B1 EP 2103896B1
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EP
European Patent Office
Prior art keywords
zone
detonator
projectile
flyer
flyer disc
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.)
Ceased
Application number
EP20090155743
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English (en)
French (fr)
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EP2103896A1 (de
Inventor
Alexandre Stepanski
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.)
Dassault Aviation SA
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Dassault Aviation SA
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Publication date
Application filed by Dassault Aviation SA filed Critical Dassault Aviation SA
Publication of EP2103896A1 publication Critical patent/EP2103896A1/de
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Publication of EP2103896B1 publication Critical patent/EP2103896B1/de
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F42B3/12—Bridge initiators

Definitions

  • the present invention relates to an improved paillet, intended to equip a detonator.
  • the invention also relates to a detonator without primary explosive equipped with such a paillet.
  • FR 2,692,346 discloses a straw according to the preamble of claim 1.
  • the detonators with primary explosive have a very high reliability of operation, because the primary explosive can be put in regime explosive by a simple flame or by a mechanical shock.
  • the major disadvantage of this type of detonator is that the primary explosive is unstable, so dangerous and delicate to handle.
  • Detonators without primary explosive use the impact of a projectile launched at high speed on a secondary explosive.
  • the absence of primary explosive has the advantage of an increase in the safety of use, in particular a reduction in sensitivity to shocks and electrostatic discharges.
  • Such a detonator also has the advantage of being able to be used at high temperatures.
  • detonation of commonly used secondary explosives requires a minimum impact velocity greater than 500 m / s.
  • the object of the invention is to provide means for a detonator without primary explosive having improved reliability, in particular to ensure a sufficiently high impact speed.
  • Such an architecture of the straw provides a complete, clean and clean cut of the straw, that is to say an optimal separation between the projectile area and that ensuring the maintenance of the flail, and a safe ejection and high speed.
  • the flap comprises one or more of the features which are the subject of claims 2 to 10.
  • the invention also relates to a detonator according to claim 11.
  • Other means which are the subject of claims 12 to 19, may participate in improving the reliability of such a detonator.
  • the detonator comprises, between the spacer and a wall of the body with which the spacer is fitted, gas sealing means resulting from the combustion of said initiation powder.
  • gas sealing means can confine these gases in the expansion chamber, so to reach a high pressure. It is thus possible to provide a high rupture pressure for the flail, which guarantees a high ejection speed for the projectile, and therefore a sufficient impact speed on the receiving explosive.
  • a sufficient seal allows to have a significant margin between the speed of ejection and the minimum required speed. This margin makes it possible to ensure good reliability of the detonator.
  • the sealing means may comprise at least one O-ring disposed in a groove of an outer wall of the spacer. They may comprise at least one metalloplastic seal.
  • the initiating powder may comprise at least one ignition powder. It may further comprise one or more gas-generating powders.
  • the receiving explosive is advantageously a secondary explosive, which gives it great stability and guarantees greater safety for a user when handling the detonator.
  • the firing system for the initiation powder may comprise a filament allowing the passage of an electrical pulse which allows the heating and firing of the initiation powder.
  • the firing system for the initiation powder may comprise optical fibers for guiding a laser beam, the impact of a light of a laser light for heating and firing the powder initiation.
  • the front is arbitrarily defined as the right of the figure 1 .
  • the figure 1 represents a longitudinal section of a detonator 2 according to the invention.
  • the detonator 2 is of substantially circular shape about a longitudinal axis X2.
  • the detonator 2 comprises a hollow body 4 and a detonating tip 6.
  • the body 4 serves as an assembly support for the various components of the detonator.
  • An initiation powder cartridge 8 is housed inside the body 4, close to an anterior zone 10 of the body 4.
  • the cartridge 8 is mounted on a support 11 mounted fitted inside the hollow body 4.
  • the detonator 2 further comprises firing means 12 for an initiation powder contained in the cartridge.
  • the firing means extend longitudinally in the body from the rear of the cartridge 8.
  • the firing means are of the filament type 14, that is to say that they comprise a filament embedded in the powder and carried by electrodes extending from the cartridge towards the rear of the body.
  • the detonating tip 6 is mounted in an anterior zone 10 of the hollow body 4. It is immobilized axially between an inner shoulder 16 of the body 4 and a folded end 18 of the body 4, in front of the anterior zone 10.
  • Anterior device 10 further comprises a cylindrical peripheral wall 19, inside which the detonating tip 6 is fitted.
  • the detonating tip 6 comprises, axially and from back to front, a washer 20, a flake 22, a spacer 24 and a cartridge 26 of receiver explosive, here a secondary explosive.
  • the washer 20 is immobilized axially between the shoulder 16 and the flap 22.
  • the flap 22 is immobilized axially between the washer 20 and the spacer 24.
  • the spacer 24 is immobilized axially by crimping between the flap 22 and the folded end 18 of the body 4.
  • the parts 20, 22, 24 are assembled one with its neighbor by brazing, welding, or any other method to ensure gas tightness between these parts.
  • the shoulder 16 is disposed immediately in front of the initiation cartridge 8, so that an expansion chamber 28 is formed by the body, around the initiation cartridge 8, the cartridge holder 11, at the rear of the cartridge 8, as well as by the washer 20 and the straw 22 at the front of the cartridge 8.
  • the spacer 24 internally forms a cylindrical axial bore 30 of diameter D30.
  • This bore opens out all its cross section at the rear of the spacer.
  • the front of the bore comprises an annular bottom 31 in which opens a housing 32 for the secondary explosive.
  • the diameter D32 of the housing 32 is smaller than the diameter D30 of the bore 30.
  • the housing 32 forms a forward cylindrical shrinkage of diameter D32, then tapers conically forwards to a front end of the spacer.
  • the secondary explosive is kept confined in the housing 32, and, beyond, by a casing 34, folded over a front portion of the spacer which extends beyond the front end 18 of the body 4.
  • L envelope 34 forms a front end of the detonator 2.
  • the envelope allows the confinement of the secondary explosive cartridge.
  • the envelope is here made of stamped metal.
  • the washer 20 has a bore of substantially the same diameter D30 as that of the bore 30 of the spacer 24.
  • the straw is substantially of revolution around an axis of straw X22.
  • the axis X22 and the axis X2 are substantially merged.
  • the straw 22 comprises a holding zone 38, a central zone 40 and an intermediate zone 46.
  • the holding zone 38 is substantially in the shape of an annular disc. It is peripheral to the intermediate and central zones.
  • the central zone 40 of the flap has the form of a hollow cylinder closed at its front end and whose outer diameter is substantially equal to the diameter D30 of the bore 30.
  • the bore of the washer 20 and the bore 30 spacer 24 together form a barrel fitted around the central zone 40 of the flap 22.
  • the central zone 40 has a convex front surface and a concave rear surface.
  • the intermediate zone 46 has the shape of a cylinder which is connected on one side to the cylindrical wall of the central zone 40 and the other to an inner peripheral edge of the holding zone 38.
  • the radial thickness E46 of the intermediate zone 46 is smaller than the axial thickness E38 of the holding zone 38 and the radial thickness of the cylindrical wall of the central zone 40.
  • the glitter of the figure 3 differs from that of the figure 2a by the presence of sealing means 41 and 43, such as for example metal-plastic seals, arranged in grooves formed in the outer wall of the central cylindrical zone 40.
  • the seals 41 and 43 make it possible to reinforce the tightness between the wall peripheral of the central zone 40 and the wall of the bore 30 and thus contribute to obtaining a high ejection speed of the central zone 40 of the flail.
  • the thickness E40 of the central zone 40 progressively increases from the periphery to the axis X22.
  • the intermediate zone and the central zone together form a cylindrical surface facing towards the front of the detonator.
  • the least thickness of the intermediate zone 46 forms a rupture primer at the junction of the central zone 40 and the holding zone 38.
  • the nip of the holding zone 38 between washer 20 and spacer 24 makes the junction the intermediate zone 46 with the holding zone 38 constitutes a possible shear zone for the flail.
  • the combustion gases exert a strong pressure behind the central portion 40, causing shearing of the intermediate portion 46 as shown in FIG. figure 2b then the propulsion of the central portion 40 in the barrel formed by the bore 30.
  • the central portion is thus transformed into a projectile 40 which will strike the bottom 31 of the bore.
  • the percussion of the bottom 31 causes the explosion of the secondary explosive contained in housing 32 which leads to it.
  • the shear failure of the flail from a certain pressure threshold allows high speed ejection of the projectile 40 formed by the central portion.
  • Sealing means 36 are arranged around the spacer, between the spacer and the peripheral wall 19. These sealing means are provided to prevent the gases from the combustion of the initiation cartridge from escaping from the device. detonator at the junction of the body and the spacer. Thus, the gases can only relax in the barrel, and they participate all in the propulsion projectile 40 from the rupture of the flap 22.
  • the sealing means may be provided redundant. In the example shown in figure 1 , the sealing means comprise two O-rings, each disposed in a respective groove 44 formed in the spacer and the grooves being spaced axially from one another.
  • FIGS. 4 to 7 illustrate alternative embodiments of the paillet figures 1 and 2a .
  • the straws Figures 4 and 7 also comprise between the holding zone 38 and the central zone 40, an intermediate zone 46 of substantially cylindrical shape extending between an inner edge of the holding zone and an outer edge of the central zone, that is to say of the projectile.
  • This central zone 40 is also of substantially cylindrical shape in that it has at the periphery an axial length sufficient to avoid the risk of tilting in the bore 30. This significant axial length can be conferred by the axial thickness of the closed end of the central zone 40 or by a cylindrical tubular wall longer or shorter between this closed end and the holding zone 38 as in the case of the embodiment of the figure 2a .
  • the intermediate zone extends forward from the inner edge of the holding zone.
  • the radial thickness E46 of the intermediate zone 46 is smaller than the thickness E38 of the holding zone 38, at the thickness E40 of the central zone 40 and, if it is extended rearward by a cylindrical tubular wall as indicated above, to the radial thickness of the cylindrical tubular wall.
  • Intermediate zone 46 thus constitutes a privileged break zone.
  • a break in the intermediate zone 46 preserves an outer edge of the projectile 40, which ensures its fit in the barrel 30 and a good seal around the projectile 40 during its ejection into the barrel. This zone makes it possible to ensure good flake cutting reliability by allowing a more uniform cutting.
  • the gases resulting from the combustion of the initiation powder remain better confined to the rear of the projectile and provide optimized propulsion.
  • the central zone 40 comprises a constant thickness E40, between two plane surfaces.
  • the central zone 40 comprises a constant thickness E40, between two curved surfaces, one convex at the front, the other concave at the rear.
  • the central zone 40 comprises two curved surfaces, one convex at the front, the other concave at the rear.
  • the thickness E40 of the central zone gradually varies by increasing as one approaches the axis X22.
  • the central zone 40 comprises a flat rear surface, and the thickness of the central zone takes two values. In an area closest to the axis X22, the thickness E40 is greater than in the rest of the central zone 40.
  • the diameter of the central portion of smaller diameter is less than or equal to that D32 of the secondary explosive cartridge 26, which increases the impact on the secondary explosive, so the reliability of the detonator.
  • the straws figures 2 , 5 and 6 for which the bulging of the front surface of the paillet increases the impact on the secondary explosive.
  • a flake made of titanium alloy, steel or aluminum is preferably used. It can be achieved by electroerosion, stamping or any other method to ensure the required geometry and accuracy.
  • FIG. 8 there is a single ignition powder 50 as initiation powder, initiated by the filament 14, as also illustrated in FIG. figure 1 .
  • the pressure wave is generated by the single ignition powder 50.
  • the cartridge contains two powders, an ignition powder initiated by the filament 14, and a gas generating powder 52.
  • the pressure wave is generated essentially by the gas generating powder 52.
  • a disbursement 60 is formed in the bottom 31 of the barrel 30.
  • the diameter D60 of the disbursement is smaller than the diameter D30 of the barrel 30 and greater than the diameter D32 of the narrowing of the housing 32.
  • the depth E60 of the disbursed is small relative to its diameter D60 .
  • the disbursed is part of the housing 32 and is also filled with secondary explosive.
  • a portion 62 of the secondary explosive is disposed on a thickness E62, behind the bottom 31 of the bore 30.
  • the thickness E62 is small relative to its diameter D30.
  • initiator powder firing system can be used.
  • the detonating tip can be assembled with the body by crimping, as described in the figures, or by other means, in particular by welding, brazing or screwing.
  • sealing means may supplement the O-rings or substitute them, in particular metal-plastic joints.
  • the body of the detonator may also be adapted so that the retaining washer is replaced by a retaining shoulder formed in the body.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Claims (19)

  1. Stoßteil (22) für Zünder (2), wobei das Stoßteil eine im Wesentlichen rotationssymmetrische Form um eine Stoßteilachse (X22) besitzt und eine ein Projektil (40) bildende Mittelzone (40) und eine Haltezone (38) am Umfang der Mittelzone umfasst, wobei die Zonen (38, 40) einteilig ausgebildet sind, dadurch gekennzeichnet, dass die Mittelzone (40) eine im Wesentlichen zylindrische Form hat, dass das Stoßteil außerdem eine Bruchzwischenzone (46) umfasst, die ebenfalls eine im Wesentlichen zylindrische Form hat und sich zwischen dem Innenrand der Haltezone (38) und dem Umfangsrand des Projektils (40) nach vorn erstreckt, wobei die Mittelzone (40) und/oder die Bruchzwischenzone (46) die Form eines Hohlzylinders haben, und dass die radiale Dicke (E46) der Zwischenzone (46) kleiner ist als die axiale Dicke (E40) der Mittelzone (40).
  2. Stoßteil nach Anspruch 1, dadurch gekennzeichnet, dass die radiale Dicke (E46) der Zwischenzone (46) kleiner ist als die radiale Dicke der zylindrischen Wand der Mittelzone (40).
  3. Stoßteil nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass die radiale Dicke (E46) der Zwischenzone (46) kleiner ist als die axiale Dicke (E38) der Haltezone (38).
  4. Stoßteil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die axiale Dicke (E38) der Haltezone im Wesentlichen konstant ist.
  5. Stoßteil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Projektil eine im Wesentlichen konstante axiale Dicke (E40) besitzt.
  6. Stoßteil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Projektil eine axiale Dicke (E40) besitzt, die sich progressiv verändert und sich in dem Maß, in dem sie sich an die Achse (X22) annähert, erhöht.
  7. Stößteil nach einem der Absprüche 1 bis 4, dadurch gekennzeichnet, dass das Projektil mehrere koaxiale Abschnitte umfasst, wobei jeder Abschnitt eine konstante axiale Dicke besitzt und umso größer ist, je näher sich der Abschnitt bei der Achse (X22) befindet.
  8. Stoßteil nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das Projektil (40) eine konvexe vordere Oberfläche besitzt.
  9. Stoßteil nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das Projektil (40) eine konkave hintere Oberfläche besitzt.
  10. Stoßteil nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Mittelzone (40) des Stoßteils an ihrem Umfang Dichtungsmittel (41, 43) aufweist.
  11. Zünder (2), der mit einem Stoßteil nach einem der Ansprüche 1 bis 10 ausgerüstet ist.
  12. Zünder nach Anspruch 11, dadurch gekennzeichnet, dass er einen Körper (4) und einen Abstandshalter (24), der durch Einfügen vor (10) dem Körper montiert ist, umfasst,
    - wobei der Körper eine Zündpulverpatrone (8) und ein Zündsystem (12, 14) für das Zündpulver trägt,
    - wobei der Körper und der Abstandshalter zwischen sich eine Expansionskammer (28) für das Zündpulver bilden,
    - wobei der Abstandshalter eine Aufnehmersprengstoffpatrone (32) trägt,
    - wobei der Abstandshalter zwischen dem Stoßteil (22) und der Aufnehmersprengstoffpatrone einen Lauf (30) für das Projektil bildet,
    - wobei das Stoßteil in der Weise montiert ist, dass das Projektil in den Lauf eingetrieben wird, und
    - das Stoßteil in der Weise montiert ist, dass die Haltezone (38) zwischen einer hinteren Fläche des Abstandshalters und einer vorderen Fläche einer Scheibe (20) oder einer Halteschulter axial durchlocht ist.
  13. Zünder nach Anspruch 12, dadurch gekennzeichnet, dass er zwischen dem Abstandshalter und einer Wand des Körpers, in die der Abstandshalter eingepasst ist, Dichtungsmittel (36) für Gase, die aus der Verbrennung des Zündpulvers stammen, umfasst.
  14. Zünder nach Anspruch 13, dadurch gekennzeichnet, dass die Dichtungsmittel wenigstens eine torische Dichtung (36) umfasst, die in einer Kehle (44) einer Außenwand des Abstandshalters angeordnet ist.
  15. Zünder nach einem der Ansprüche 13 und 14, dadurch gekennzeichnet, dass die Dichtungsmittel eine metalloplastische Dichtung umfassen.
  16. Zünder nach einem der Absprüche 12 bis 15, dadurch gekennzeichnet, dass das Zündpulver wenigstens ein Entflammungspulver (50) umfasst.
  17. Zünder nach Anspruch 16, dadurch gekennzeichnet, dass das Zündpulver außerdem ein oder mehrere Gaserzeugungspulver (52) umfasst.
  18. Zünder nach einem der Ansprüche 12 bis 17, dadurch gekennzeichnet, dass der Aufnehmerspeengstoff ein sekundärer Sprengstoff ist.
  19. Zünder nach einem der Ansprüche 12 bis 18, dadurch gekennzeichnet, dass das Zündsystem für das Zündpulver Lichtleitfasern für die Führung eines Laserstrahls umfasst.
EP20090155743 2008-03-21 2009-03-20 Flugscheibe und solche Flugscheibe umfassender Slappper-Zünder ohne Initialsprengstoff Ceased EP2103896B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0851845A FR2928998B1 (fr) 2008-03-21 2008-03-21 Paillet et detonateur sans explosif primaire comprenant un tel paillet

Publications (2)

Publication Number Publication Date
EP2103896A1 EP2103896A1 (de) 2009-09-23
EP2103896B1 true EP2103896B1 (de) 2012-05-02

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EP20090155743 Ceased EP2103896B1 (de) 2008-03-21 2009-03-20 Flugscheibe und solche Flugscheibe umfassender Slappper-Zünder ohne Initialsprengstoff

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FR (1) FR2928998B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103743299B (zh) * 2014-01-13 2015-06-17 中国工程物理研究院化工材料研究所 用于冲击片雷管扁平电缆连接的低电感连接器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978791A (en) * 1974-09-16 1976-09-07 Systems, Science And Software Secondary explosive detonator device
US4144814A (en) * 1976-07-08 1979-03-20 Systems, Science And Software Delay detonator device
US4944225A (en) * 1988-03-31 1990-07-31 Halliburton Logging Services Inc. Method and apparatus for firing exploding foil initiators over long firing lines
FR2692346B1 (fr) * 1992-06-16 1995-07-07 Davey Bickford Amorce optique de generateur pyrotechnique a basse energie.

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FR2928998A1 (fr) 2009-09-25
EP2103896A1 (de) 2009-09-23
FR2928998B1 (fr) 2011-05-06

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