EP0010487B1 - Treibladungsanzünder mit einem Glühdraht - Google Patents

Treibladungsanzünder mit einem Glühdraht Download PDF

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Publication number
EP0010487B1
EP0010487B1 EP79400737A EP79400737A EP0010487B1 EP 0010487 B1 EP0010487 B1 EP 0010487B1 EP 79400737 A EP79400737 A EP 79400737A EP 79400737 A EP79400737 A EP 79400737A EP 0010487 B1 EP0010487 B1 EP 0010487B1
Authority
EP
European Patent Office
Prior art keywords
pyrotechnic
initiator
ignition
housing
composition
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.)
Expired
Application number
EP79400737A
Other languages
English (en)
French (fr)
Other versions
EP0010487A1 (de
Inventor
Christian Cannavo
André Espagnacq
Marie Riffault
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.)
Direction General de lArmement DGA
Original Assignee
Delegation Generale pour lArmement
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 Delegation Generale pour lArmement filed Critical Delegation Generale pour lArmement
Publication of EP0010487A1 publication Critical patent/EP0010487A1/de
Application granted granted Critical
Publication of EP0010487B1 publication Critical patent/EP0010487B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
    • C06B45/04—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive
    • C06B45/06—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component
    • C06B45/10—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component the organic component containing a resin
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B33/00—Compositions containing particulate metal, alloy, boron, silicon, selenium or tellurium with at least one oxygen supplying material which is either a metal oxide or a salt, organic or inorganic, capable of yielding a metal oxide
    • 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
    • F42B3/124—Bridge initiators characterised by the configuration or material of the bridge

Definitions

  • the invention relates to devices for the electro-pyrotechnic ignition of propellant charges of artillery and missiles, or of fireworks such as, for example, illuminating, tracing, smoke, incendiary and gas generator devices.
  • Resistant wire systems are igniters in which a filament or pseudofilament is placed within a thermosensitive pyrotechnic substance.
  • a distinction is made between hot wire cells and exploded wire cells.
  • Conductive substance systems are igniters in which the current conducting element consists of the pyrotechnic substance itself; this substance can be conductive by adding various powders.
  • Hot-wire electro-pyrotechnic cells require the use of products sensitive to the heating produced by the passage of a current through the filament.
  • the pyrotechnic charge contained in an electrical igniter of this type is usually ignited using a certain quantity of primary explosive placed around the initiator's initiating wire, either in the form of a compressed powder or in the form of a match head bead.
  • the disadvantages of these igniters are, on the one hand their sensitivity to shocks and friction which gives the components certain risks from the point of view of safety of use, and on the other hand reside in the dangers specific to the handling of the primary explosive.
  • the cells with conductive substances are of simpler design; but their principle of. operation is identical, namely that when the electrical energy expended makes it possible to reach the ignition temperature of the pyrotechnic product based on primary explosive, the igniter operates by emitting a heat and gas flow.
  • Cells with conductive substances therefore offer the same drawbacks as hot-wire cells with, in addition, the fact that the operating energies are difficult to control, which also goes against safety.
  • the pyrotechnic substance In exploded wire cells, the pyrotechnic substance is put into operating mode by the explosion of the filament, a phenomenon which requires a significant supply of electrical energy, much greater than that necessary in the case of ignition of the wire cells. hot. Given the large amount of energy used in this initiation mode, in can use insensitive pyrotechnic mixtures which ignite with difficulty under the action of weak sources of energy, but easily in the case of energies or sufficiently large electric currents. Such compositions are much less sensitive than those used in the previous systems. Consequently, the exploded wire cells are satisfactory from the point of view of safety, but the volume, mass and complexity constraints of the associated electrical source, make the initiation system unusable in many devices.
  • the invention aims to provide a device of the type envisaged to overcome the aforementioned disadvantages.
  • the invention relates to the production of an electro-pyrotechnic igniter operating with a limited electrical energy and not comprising pyrotechnic substances sensitive to external mechanical stresses, to thermal effects and to the electrostatic or electro-magnetic environment.
  • the initiating pyrotechnic composition is preferably composed by the association a zirconium powder, a lead chromate powder and silicone resin, according to the respective mass percentages, 57%, 38% and 5% of RTV 20581 resin sold by Rhone-Poulenc.
  • the pyrotechnic cell is composed by the association of the initiating pyrotechnic composition and the inflammatory pyrotechnic composition according to the respective percentages: 5 to 15% and 85 to 95% and preferably 13% and 87%.
  • the ignition initiator is characterized by the fact that the filament is disposed at the bottom of the housing cavity, its ends being extended by isolated pins, passing through the housing, capable of being connected to a source of electricity.
  • the housing is made of an insulating material, the filament being disposed at the bottom of the housing cavity and being connected to a turn induced by an electromagnetic field integrated in the housing.
  • the housing consists of an inert, or pyrotechnically active, combustible material, for example based on nitrocellulose; the active boxes can undergo sand detonate the initiation using a 30 g hexogen tablet.
  • the initiator comprises a box 1 comprising an open cavity 2 in which is disposed the pyrotechnic cell and the filament 3 heated during ignition.
  • the pins 4 isolated from each other, pass through the bottom of the housing, and are connected to the ends of the filament 3. These pins 4 are intended to be brought into contact with a source of electricity which is not shown.
  • the pyrotechnic cell is constituted by an initiating pyrotechnic composition 5 and by an inflammatory pyrotechnic composition 6.
  • a layer of a few tenths of a millimeter, or approximately 25 to 35 mg, of initiating composition 5 composed by the association of zirconium powder, of powder of lead chromate and silicone resin RTV 20521 playing the role of binder and phlegmatizer is placed in a pasty state on the filament.
  • the respective percentages by mass of zirconium powder, lead chromate powder and RTV 20521 resin are: 57%, 38% and 5%.
  • the ignition temperature of this composition is of the order of 320 ° C. On the other hand, it has an impact sensitivity coefficient (C.S.I.) of 32% starting with 112 joules.
  • This measurement of C.S.I. was determined by method FMD 410 B1 of the manual of operating procedures STPE; the measurement is carried out according to the fall of a determined mass falling from a variable height onto a sample, taken in small quantity in a specially shaped capsule.
  • the coefficient of friction sensitivity (C.S.F.) of this composition is 118 N, a measurement determined as the following, by the FMD 420 A method of the previous manual which implements the Julius Peters device (BAM).
  • BAM Julius Peters device
  • the upper electrode is spherical in shape with a diameter of 10 mm, the lower electrode being cylindrical and with a diameter of 2 mm.
  • An insulating cup has a conical cone-shaped housing in which the pyrotechnic substance to be tested is arranged, without settling.
  • the angle at the top of the truncated cone is 90 °, the diameter of the largest section is 5.5 mm and the lower electrode is flush with the smallest section of diameter 2 mm.
  • This thin layer of pyrotechnic composition playing the role of a match, is suicharged, when dry, with a layer of inflammatory pyrotechnic composition composed by the association of aluminum powder and copper oxide powder , according to the respective percentages by mass of 40% and 60%.
  • This mixture has an ignition temperature of the order of 550 ° C, a C.S.I. 112 joules, a C.S.F. of 335 N, a coefficient of sensitivity to static electricity of around 50 millijoules (1000 pF capacitor charged - at 10 kV).
  • inflammatory pyrotechnic composition compressed to 300 bar was used, which gives the initiator an inflammatory power largely sufficient to light effectively black powder type PN L 1, placed a few millimeters in a sachet in airy fabric.
  • the opening of the cavity 2 of the housing is closed by a disk 7 of strong paper, glued and varnished, so as to isolate the pyrotechnic cell from the outside environment.
  • FIG. 2 Another embodiment (fig. 2) is an initiator, the firing order of which is effected by induction of a high frequency high power signal; which offers the advantage, compared to conventional electric initiators, of not requiring any direct connection to the filament circuit: this feature makes it possible to keep intact the intrinsic characteristics of the initiator from the point of view of electrical safety because the direct addition of conductors can, by causing an antenna effect, capture electrostatic or electromagnetic energies and make the system aware of these risks.
  • This particular embodiment is composed of a housing 8 made of inert or active insulating material.
  • This housing has a cavity 9 in which is disposed a disc 10 (fig. 2 and 3) on which is maintained an induced turn 11 whose ends 12 extend to the vicinity of the center of the disc, and on which a filament is welded 13.
  • This disc 10 is held at the bottom of the cavity 9 of the housing 8 by a cover 14 made of the same material as the housing 8.
  • This cover 14 is fitted onto the lateral surface of the cavity 9 and can, for example, be there be secured by bonding.
  • this cover has a hole 15 opening on the filament 13. This hole 15, in the same way as in the embodiment described above, is filled by the pyrotechnic cell, and is closed by a paper disc. strong 16.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Molecular Biology (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Resistance Heating (AREA)

Claims (9)

1. Heissfadenzünder, gekennzeichnet durch folgende Bestandteile:
- ein Gehaüse (1) mit einem offenen Hohlraum (2)
- ein Faden (3) in diesem offenen Hohlraum (2)
- eine pyrotechnische Zelle, bestehend aus:
- einer pyrotechnischen Zündmischung (5), die in engem Kontakt mit dem Faden (3) ist, und deren Emfindlichkeitskoeffizient Stössen gegenüber mindestens 100 Joule beträgt, der Emfindlichkeitskoeffizient Reibung gegenüber beträgt mindestens 100 N, der Empfindlichkeitskoeffizient statischer Elektrizität gegenüber ist etwa 16 Millijoule und die Entzündtemperatur liegt zwichen 250 und 350°C, die genannte Zündmischung bestend aus einer Vereinigung von Zirkoniumpulver, Bleichromatpulver und siliziumharz-, deren Massenprozente jeweils 40 bis 80%, 18 bis 60% und 2 bis 8% betragen,
- einer pyrotechnischen Entzündmischung (6) die in der Nähe oder in direktem Kontakt mit der Zündmischung angebracht ist, wobei diese Mischung einen Strossempfindlichkeitskoeffizienten von mindestens 100 joule, einen Reibungsempfindlichkeitskoeffizienten von mindestens 300 N, einen Empfindlichkeitskoeffizienten statischer Elektrizität gegenüber von etwa 50 Millijoule hat, und eine Entzündungstemperatur, die zwischen 400 und 750°C liegt, die besagte Entzündmischung bestend aus einer Vereinigung vo Aluminiumpulver, Kupferoxydpulver und einen Nitratpolymär deren jeweiligen Masseprozente 15 bis 60%, 40 bis 85% und 0 bis 12% betragen.
2. Zünder gemäss des anspruches 1 dadurch gekennzeichnet dass die Zusammensetzung der pyrotechnischen Zündmischung (5) die sich aus Zirkoniumpulver, Bleichromatpulver und Siliziumharz RTV 20581, nach folgenden entsprechenden Masseprozenten ergibt: 57%, 38% und 5%.
3. Zünder gemäss des anspruches 1, dadurch gekennzeichnet dass die Zusammensetzung der Entzündmischung (6), die sich aus Aluminiumpulver und Kupferoxydpulver nach folgenden entsprechenden Masseprozenten ergibt: 40% und 60%.
4. Zünder gemäss eines der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Zusammensetzung der pyrotechnischen Zelle besteht aus der Zusammenfügung der pyrotechnischen Zündmischung (5) und der Pyrotechnischen Entzündmischung (6) nach den jeweiligen Prozentsätzen von 5 bis 15% und von 85 bis 95%.
5. Zünder gemäss des Anspruches 4, dadurch gekennzeichnet, dass die Zusammenstellung der pyrotechnischen Zelle besteht aus der Zusammenfügung der pyrotechnischen Zündmischung (5) und der pyrotechnischen Entzündmischung (6) nach den jeweiligen Prozentsätzen von 13% bis 78%.
6. Zünder gemäss eines der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Lage des Fadens auf dem Boden des Hohlraumes des Gehäuses, und dass die Fadenenden durch isolierte Buchsen (4) sind, die das Gehäuse (1) durchqueren, und können an eine stromquelle angeschlossen werden.
7. Zünder gemäss eines der vorhergehenden Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Gehäuse (8) aus lsoliermaterial besteht und dass der auf dem Boden des Hohlraumes des Gehäuses liegende Heizfaden (3) an einer im Gehäuse integrierten elektromagnetischen Induktionsschleife (11) angeschlossen ist.
8. Zünder gemäss eines der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Gehäuse aus brennbarem Material besteht.
9. Zünder gemass des Anspruches 7, dadurch gekennzeichnet, dass die Induktionsschleife (11) zwischen dem Gehäuse (8) und einem Deckel (14), der die pyrotechnische Zelle beherbergt, liegt.
EP79400737A 1978-10-13 1979-10-12 Treibladungsanzünder mit einem Glühdraht Expired EP0010487B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7829210 1978-10-13
FR7829210A FR2438821A1 (fr) 1978-10-13 1978-10-13 Dispositif d'allumage a fil chaud de securite

Publications (2)

Publication Number Publication Date
EP0010487A1 EP0010487A1 (de) 1980-04-30
EP0010487B1 true EP0010487B1 (de) 1982-06-23

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Application Number Title Priority Date Filing Date
EP79400737A Expired EP0010487B1 (de) 1978-10-13 1979-10-12 Treibladungsanzünder mit einem Glühdraht

Country Status (7)

Country Link
US (1) US4354432A (de)
EP (1) EP0010487B1 (de)
BE (1) BE879385A (de)
CH (1) CH634143A5 (de)
DE (1) DE2963180D1 (de)
FR (1) FR2438821A1 (de)
IT (1) IT1123852B (de)

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US6821295B1 (en) 2000-06-26 2004-11-23 Thoratec Corporation Flared coronary artery bypass grafts

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RU2745086C1 (ru) * 2020-05-12 2021-03-19 Российская Федерация, от имени которой выступает Министерство обороны Российской Федерации Инициатор модульного метательного заряда
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Publication number Priority date Publication date Assignee Title
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Also Published As

Publication number Publication date
FR2438821B1 (de) 1981-03-27
EP0010487A1 (de) 1980-04-30
FR2438821A1 (fr) 1980-05-09
IT7926509A0 (it) 1979-10-15
BE879385A (fr) 1980-02-01
CH634143A5 (fr) 1983-01-14
IT1123852B (it) 1986-04-30
US4354432A (en) 1982-10-19
DE2963180D1 (en) 1982-08-12

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