EP0258704B1 - Pyrotechnical delay charge - Google Patents

Pyrotechnical delay charge Download PDF

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Publication number
EP0258704B1
EP0258704B1 EP87111732A EP87111732A EP0258704B1 EP 0258704 B1 EP0258704 B1 EP 0258704B1 EP 87111732 A EP87111732 A EP 87111732A EP 87111732 A EP87111732 A EP 87111732A EP 0258704 B1 EP0258704 B1 EP 0258704B1
Authority
EP
European Patent Office
Prior art keywords
delay
delayed action
tube
composition
fact
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 - Lifetime
Application number
EP87111732A
Other languages
German (de)
French (fr)
Other versions
EP0258704A2 (en
EP0258704A3 (en
Inventor
Walter Dr. Holzinger
Robert Gebhardt
Franz Hieble
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.)
Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH
Original Assignee
Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH
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 Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH filed Critical Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH
Publication of EP0258704A2 publication Critical patent/EP0258704A2/en
Publication of EP0258704A3 publication Critical patent/EP0258704A3/en
Application granted granted Critical
Publication of EP0258704B1 publication Critical patent/EP0258704B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F42B3/16—Pyrotechnic delay initiators
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C5/00—Fuses, e.g. fuse cords
    • C06C5/06—Fuse igniting means; Fuse connectors

Definitions

  • the invention relates to a pyrotechnic retardation set with a mixture of metallic reducing agents, inorganic oxidizing agents and optionally further additives in a retardation tube.
  • Such delay sets are known, e.g. from DE-A-2 920 134.
  • the mixture of substances is pressed into the retarding tube and the reducing agent or oxidizing agent or agents are designed so that the mixture burns as possible without the release of gaseous reaction products.
  • the release of hot gases cannot be avoided entirely.
  • the consumption of the propellant charge depends on the temperature and pressure.
  • the hot gases stored in the delay set closed by the delay tube therefore influence the reaction kinetics and thus the delay time. This has a particularly negative effect on longer-burning delay sets.
  • the object of the invention is to create a pyrotechnic delay set which has a reproducible delay time.
  • the hot gases released during the combustion can flow into the space between the delay set and the delay tube. In this way, the heat and pressure of the hot gases otherwise acting on the delay set are at least partially dissipated into the intermediate space, and the influence of the hot gases on the delay set is accordingly reduced.
  • the diameter of the delay set no longer needs to be placed close to the critical diameter, as a result of which the influence of the ambient temperature on the delay time is reduced. This influence is further reduced by the fact that the amount of gas released forms a standing gas cushion in the space between the delay set and the delay tube, which additionally isolates the delay set from the surroundings.
  • the gap is preferably maintained by spacers between the delay set and the delay tube. It is advantageous, for. B. metal rings as a spacer between the delay set and the delay tube, a coil spring proving to be particularly useful. Due to the windings of such a spring, the heat conduction takes place preferably in the radial direction, ie the heat of the hot gases in the intermediate space is dissipated to the delay tube. In this way, a preceding, preheating of the retardation rate which increases the burning rate is largely prevented by the hot gases in the intermediate space.
  • the delay rate 1 consists of a z. B. pressed or extruded rod from a mixture of metallic reducers, inorganic oxidizing agents and other inert additives, such as a plastic binder. It is arranged in a delay tube 2, at a distance from it, i. H. forming an annular space 3.
  • the delay tube 2 is closed at both ends by plugs 4 and 5. Holes 6 and 7 are provided in both sealing plugs for connection to a pyrotechnic input signal or output signal line, not shown.
  • a spiral spring 8 made of metal is arranged around the delay set 1 or in the intermediate space 3 and extends into an annular recess 9 or 10 in the sealing plugs 4 and 5.
  • the delay tube 2 is attached to the circumference of the sealing plugs 4 and 5 by being pressed into grooves 11 and 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Air Bags (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Fuses (AREA)
  • Developing Agents For Electrophotography (AREA)

Description

Die Erfindung bezieht sich auf einen pyrotechnischen Verzögerungssatz mit einer Mischung aus metallischen Reduktionsmitteln, anorganischen Oxidationsmitteln und gegebenenfalls weiteren Zusätzen in einem Verzögerungsröhrchen.The invention relates to a pyrotechnic retardation set with a mixture of metallic reducing agents, inorganic oxidizing agents and optionally further additives in a retardation tube.

Derartige Verzögerungssätze sind bekannt, z.B. aus der DE-A-2 920 134. Die Stoffmischung wird dabei in das Verzögerungsröhrchen eingepreßt und das oder die Reduktionsmittel und Oxidationsmittel sind dabei so ausgelegt, daß die Mischung möglichst ohne Freisetzung gasförmiger Reaktionsprodukte abbrennt. Die Freisetzung heißer Gase ist dennoch nicht ganz zu vermeiden. Andererseits ist der Abbrand des Treibsatzes temperatur- und druckabhängig. Die in dem durch das Verzögerungsröhrchen geschlossenen Verzögerungssatz gespeicherten heißen Gase beeinflussen daher die Reaktionskinetik, und damit die Verzögerungszeit. Dies wirkt sich insbesondere bei längerbrennenden Verzögerungssätzen negativ aus.Such delay sets are known, e.g. from DE-A-2 920 134. The mixture of substances is pressed into the retarding tube and the reducing agent or oxidizing agent or agents are designed so that the mixture burns as possible without the release of gaseous reaction products. The release of hot gases cannot be avoided entirely. On the other hand, the consumption of the propellant charge depends on the temperature and pressure. The hot gases stored in the delay set closed by the delay tube therefore influence the reaction kinetics and thus the delay time. This has a particularly negative effect on longer-burning delay sets.

Wie vorstehend erwähnt, läßt sich dieses Verhalten über die gewählte Mischung nicht beseitigen, weil eine völlig gaslose Reaktion bisher nicht zur Verfügung steht. Auch läßt sich zur Verringerung der Gaserzeugung der Durchmesser des Verzögerungssatzes nicht beliebig reduzieren. Denn bei einer solchen Verringerung wird die Wärmeabfuhr von dem abbrennenden Verzögerungssatz über das Verzögerungsröhrchen an die Umgebung erhöht, was ebenfalls Einfluß auf die Verzögerungszeit hat und im Extremfall zu einem Verlöschen des Verzögerungssatzes führen kann.As mentioned above, this behavior cannot be eliminated via the selected mixture, because a completely gas-free reaction has not hitherto been available. Also, the diameter of the delay set cannot be reduced arbitrarily to reduce the gas generation. Because with such a reduction, the heat dissipation from the burning delay set to the surroundings via the delay tube is increased, which also has an influence on the delay time and, in extreme cases, can lead to the delay set being extinguished.

Der Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, liegt die Aufgabe zugrunde, einen pyrotechnischen Verzögerungssatz zu schaffen, der eine möglichst reproduzierbare Verzögerungszeit aufweist.The object of the invention, as characterized in the claims, is to create a pyrotechnic delay set which has a reproducible delay time.

Bei dem erfindungsgemäßen Verzögerungssatz können die beim Abbrennen freigesetzten heißen Gase in den Zwischenraum zwischen dem Verzögerungssatz und dem Verzögerungsröhrchen strömen. Auf diese Weise werden die sonst auf den Verzögerungssatz einwirkende Wärme und der Druck der heißen Gase zumindest teilweise in den Zwischenraum abgeführt und damit die Beeinflussung des Verzögerungssatzes durch die heißen Gase entsprechend reduziert.In the delay set according to the invention, the hot gases released during the combustion can flow into the space between the delay set and the delay tube. In this way, the heat and pressure of the hot gases otherwise acting on the delay set are at least partially dissipated into the intermediate space, and the influence of the hot gases on the delay set is accordingly reduced.

Dadurch braucht der Durchmesser des Verzögerungssatzes nicht mehr nahe an den kritischen Durchmesser gelegt zu werden, wodurch der Einfluß der Umgebungstemperatur auf die Verzögerungszeit herabgesetzt wird. Dieser Einfluß wird dadurch weiter vermindert, daß die freigesetzte Gasmenge im Zwischenraum zwischen dem Verzögerungssatz und dem Verzögerungsröhrchen ein stehendes Gaspolster bildet, welches den Verzögerungssatz gegenüber der Umgebung zusätzlich isoliert.As a result, the diameter of the delay set no longer needs to be placed close to the critical diameter, as a result of which the influence of the ambient temperature on the delay time is reduced. This influence is further reduced by the fact that the amount of gas released forms a standing gas cushion in the space between the delay set and the delay tube, which additionally isolates the delay set from the surroundings.

Der Zwischenraum wird vorzugsweise durch Abstandshalter zwischen dem Verzögerungssatz und dem Verzögerungsröhrchen aufrechterhalten. Vorteilhaft ist es, z. B. Metallringe als Abstandshalter zwischen dem Verzögerungssatz und dem Verzögerungsröhrchen anzuordnen, wobei sich eine Spiralfeder als besonders zweckmäßig erweist. Durch die Windungen einer solchen Feder erfolgt die Wärmeleitung bevorzugt in radialer Richtung, d. h. die Wärme der heißen Gase in dem Zwischenraum wird zum Verzögerungsröhrchen hin abgeführt. Auf diese Weise wird eine vorauslaufende, die Brenngeschwindigkeit steigernde Vorerwärmung des Verzögerungssatzes durch die heißen Gase in dem Zwischenraum weitgehend unterbunden.The gap is preferably maintained by spacers between the delay set and the delay tube. It is advantageous, for. B. metal rings as a spacer between the delay set and the delay tube, a coil spring proving to be particularly useful. Due to the windings of such a spring, the heat conduction takes place preferably in the radial direction, ie the heat of the hot gases in the intermediate space is dissipated to the delay tube. In this way, a preceding, preheating of the retardation rate which increases the burning rate is largely prevented by the hot gases in the intermediate space.

Nachstehend ist eine Ausführungsform der Erfindung anhand der Zeichnung näher erläutert, deren einzige Figur einen Längsschnitt durch einen Verzögerungssatz zeigt.An embodiment of the invention is explained in more detail below with reference to the drawing, the single figure of which shows a longitudinal section through a deceleration set.

Der Verzögerungssatz 1 besteht aus einer z. B. gepreßten oder extrudierten Stange aus einer Mischung aus metallischen Reduktoren, anorganischen Oxidationsmitteln und weiteren inerten Zuschlägen, wie einem Kunststoffbinder. Er ist in einem Verzögerungsröhrchen 2 angeordnet, und zwar im Abstand davon, d. h. unter Bildung eines ringförmigen Zwischenraumes 3.The delay rate 1 consists of a z. B. pressed or extruded rod from a mixture of metallic reducers, inorganic oxidizing agents and other inert additives, such as a plastic binder. It is arranged in a delay tube 2, at a distance from it, i. H. forming an annular space 3.

Das Verzögerungsröhrchen 2 ist an beiden Enden durch Verschlußstopfen 4 und 5 verschlossen. In beiden Verschlußstopfen sind Bohrungen 6 bzw. 7 zum Anschluß an eine nicht dargestellte pyrotechnische Eingangssignal- bzw. Ausgangssignalleitung vorgesehen.The delay tube 2 is closed at both ends by plugs 4 and 5. Holes 6 and 7 are provided in both sealing plugs for connection to a pyrotechnic input signal or output signal line, not shown.

Um den Verzögerungssatz 1 bzw. in dem Zwischenraum 3 ist eine Spiralfeder 8 aus Metall angeordnet, die sich bis in eine Ringausnehmung 9 bzw. 10 in den Verschlußstopfen 4 und 5 erstreckt. Das Verzögerungsröhrchen 2 ist durch Einpressen in Nuten 11 und 12 am Umfang der Verschlußstopfen 4 und 5 befestigt.A spiral spring 8 made of metal is arranged around the delay set 1 or in the intermediate space 3 and extends into an annular recess 9 or 10 in the sealing plugs 4 and 5. The delay tube 2 is attached to the circumference of the sealing plugs 4 and 5 by being pressed into grooves 11 and 12.

Claims (3)

  1. Delayed action composition (1) comprising a mixture of metallic reducing agents, inorganic oxidising agents and possibly further additions contained in a delayed action cylinder (2), characterised by the fact that an intermediate space (3) is provided between the delayed action cylinder (2) and the delayed action composition (1).
  2. Delayed action composition in accordance with Claim 1, characterised by the fact that a spacing device is provided between the delayed action composition and the delayed action cylinder (2).
  3. Delayed action composition in accordance with Claim 2, characterised by the fact that the spacing device is formed by a spiral spring (8) mounted around the delayed action composition (1).
EP87111732A 1986-09-04 1987-08-13 Pyrotechnical delay charge Expired - Lifetime EP0258704B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863630081 DE3630081A1 (en) 1986-09-04 1986-09-04 PYROTECHNICAL DELAY KIT
DE3630081 1986-09-04

Publications (3)

Publication Number Publication Date
EP0258704A2 EP0258704A2 (en) 1988-03-09
EP0258704A3 EP0258704A3 (en) 1989-11-02
EP0258704B1 true EP0258704B1 (en) 1991-10-30

Family

ID=6308882

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111732A Expired - Lifetime EP0258704B1 (en) 1986-09-04 1987-08-13 Pyrotechnical delay charge

Country Status (3)

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US (1) US4776275A (en)
EP (1) EP0258704B1 (en)
DE (2) DE3630081A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5293821A (en) * 1990-06-22 1994-03-15 Ici Canada Inc. Delay initiator for blasting
DE202017102257U1 (en) * 2017-04-13 2017-06-20 Fr. Sobbe Gmbh Ignition device in compact version

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE282941C (en) *
DE419509C (en) * 1924-12-20 1925-10-09 Josef Norres Electric timer
US1821608A (en) * 1929-06-01 1931-09-01 Du Pont Blasting cap
DE745360C (en) * 1943-06-13 1945-01-08 Schaffler & Co Ignition cord timer
BE531171A (en) * 1954-08-04
FR1099305A (en) * 1958-08-15 1955-09-02 Ici Ltd Improvements to string-shaped lighting devices for lighting bickford cords
US3336869A (en) * 1966-05-05 1967-08-22 William R Peterson Fuze apparatus
US3792660A (en) * 1972-03-31 1974-02-19 Gen Motors Corp Flexible pyrotechnic relay
DE2920134A1 (en) * 1979-05-18 1980-11-27 Beermann Paul Delayed detonator with water and temp. insensitive combustible compsn. - on ignition and discharge side of delay charge to give simple safe function
US4350097A (en) * 1980-05-19 1982-09-21 Atlas Powder Company Nonelectric delay detonator with tubular connecting arrangement
US4479436A (en) * 1982-01-15 1984-10-30 Wilson Douglas G Device for igniting safety fuse

Also Published As

Publication number Publication date
DE3630081A1 (en) 1988-03-10
DE3630081C2 (en) 1991-06-06
EP0258704A2 (en) 1988-03-09
EP0258704A3 (en) 1989-11-02
DE3774215D1 (en) 1991-12-05
US4776275A (en) 1988-10-11

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