EP2656002B1 - Pyrotechnisches bruchstück mit reversibler detonation - Google Patents

Pyrotechnisches bruchstück mit reversibler detonation Download PDF

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Publication number
EP2656002B1
EP2656002B1 EP11811083.2A EP11811083A EP2656002B1 EP 2656002 B1 EP2656002 B1 EP 2656002B1 EP 11811083 A EP11811083 A EP 11811083A EP 2656002 B1 EP2656002 B1 EP 2656002B1
Authority
EP
European Patent Office
Prior art keywords
section
longitudinal
pyrotechnic
facet
fixing means
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.)
Active
Application number
EP11811083.2A
Other languages
English (en)
French (fr)
Other versions
EP2656002A1 (de
Inventor
Jean-Yves Cousin
Thomas Kister
Pascal LESAULNIER
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.)
Airbus Defence and Space SAS
Original Assignee
Astrium SAS
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Filing date
Publication date
Application filed by Astrium SAS filed Critical Astrium SAS
Publication of EP2656002A1 publication Critical patent/EP2656002A1/de
Application granted granted Critical
Publication of EP2656002B1 publication Critical patent/EP2656002B1/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
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B15/00—Self-propelled projectiles or missiles, e.g. rockets; Guided missiles
    • F42B15/36—Means for interconnecting rocket-motor and body section; Multi-stage connectors; Disconnecting means
    • F42B15/38—Ring-shaped explosive elements for the separation of rocket parts

Definitions

  • the present invention relates to a detonating pyrotechnic breakpiece, particularly, though not exclusively, suitable for use in space launchers. It will be described hereinafter more particularly in this latter application.
  • the pyrotechnic piece operates only in the aforementioned sense. Indeed, it can be provided a plurality of positioning studs or a boss of the structure of the workpiece, the cord can be supported on it under the effect of gravitation.
  • the cord has a preferred position, for which it is based either on the boss of the structure or on the anvil.
  • the axial position (or altitude) of the cord differs from this preferred position, which can adversely affect the cutting performance in that the altitude of said cord (which acts as a lever in relation to the bottom throat, where the cut is initiated) influences said performance.
  • a reversible pyrotechnic rupture part that is to say capable of breaking in the heel direction at the top and in the heel direction at the bottom
  • an axial positioning of the cord that is independent of the relative positioning of the elements. two sections, and therefore both to position and maintain axially said cord in the groove.
  • a solution envisaged is to achieve the blocking of the cord directly by the profile serving as anvil, equipped for this purpose with a pad and brought into contact with said cord before tightening the screw for securing the two sections.
  • a protruding longitudinal rib against which the profile serves as an anvil by means of wedges it proves impossible to guarantee both the contact between the anvil and the rib (which conditions the clearance between said anvil and the heel) and the contact of said anvil with the cord through the positioning studs.
  • the object of the present invention is to remedy these drawbacks and relates to a detonating pyrotechnic rupture piece whose pyrotechnic cord can be maintained, independently of the anvil, in an identical position and independent of the relative positioning of the two sections, with a view to rendering said reversible part and able to operate in all flight conditions.
  • the system for positioning and holding said peripheral cord inside said groove is completely independent of the securing system of the sections of the second section on said first profile.
  • these second fixing means provide a trapping function of the cord so as to make it integral with one of the two sections (or one of the two parts to be separated) during the pyrotechnic rupture, in addition to the maintenance function of said cord provided by the first fixing means.
  • each of said second fastening means comprises a rigid or semi-rigid link which forms a loop enclosing said pyrotechnic cord and whose ends are fixed to said first section.
  • a rigid link can be made of a metal strip, which is capable of trapping the cord.
  • a spacer plate is disposed between the ends of said rigid or semi-rigid link and the two ends of said link are fixed to the first profile by at least one bolt whose screw passes through said ends, the spacer plate and said first profile and of which the nut clamps said ends against said spacer plate and said first section.
  • a positioning stud may be disposed between said spacer board and said pyrotechnic line.
  • the pyrotechnic rupture piece shown on the Figures 1 to 3 and according to the present invention, comprises a base profile 1, a plurality of anvil profile sections 2 - only two of which are visible on the figure 1 and a detonating pyrotechnic cord 3.
  • the profile 1 and the section sections 2 are for example made of aluminum and said part can be rectilinear, curvilinear, cylindrical, etc. depending on the shape of the desired cutting line between two elements (not shown) secured in any known manner to the longitudinal edges 1 L1 and 1 L2 of the base profile 1.
  • the latter is part of the structure formed by said elements and ensures the transmission of mechanical forces between them.
  • the base profile 1 comprises a hook-shaped longitudinal salient heel 4 provided with a plane longitudinal facet 5 on the inner side of its free end 6.
  • the longitudinal facet 5 is inclined and diverges towards the outside of the hook formed by said heel 4.
  • the base section 1 is provided with a longitudinal groove 7 inclined bottom determines with said base section 1 a longitudinal bottom groove 7A, with a small radius of curvature, said longitudinal groove 7 being disposed of side of the concavity of said heel 4 and an end-of-rupture groove 8 being made in said base section 1 on the opposite side to said groove 7.
  • the anvil profile sections 2 are attached to the base section 1 one after the other, the transverse end edges 2D and 2G opposite two consecutive sections 2 being at least substantially joined. These sections of section 2 are secured to the base section 1 by bolts 9, passing through the profile 1 and said section sections 2 and distributed along them. These segments of anvil profile 2 comprise, on the external side of their end, a longitudinal plane facet 11 inclined and converging towards the inside of the hook formed by the heel 4.
  • the free longitudinal end 10 of the anvil profile sections 2 penetrates into the hook formed by the heel 4, so as to close said groove 7, the inclined facets 5 and 11 then being opposite one another, but spaced apart by a predetermined clearance 12 of a few tenths of a millimeter.
  • the base profile 1 further comprises a protruding longitudinal rib 15 against which said anvil profile sections 2 bear, on the opposite side to their free longitudinal end 10, via a plurality of distributed discontinuous spacers 16. along the profile 1 in correspondence with said bolts 9. There are provided tabs 17 to allow the fixing of the wedges 16, for example by means of the bolts 9.
  • the outer casing 13 is positioned axially, parallel to the direction L corresponding to the width of said sections 1 and 2, by lower positioning studs 25 (Usually arranged by gluing on the bottom of the throat of the heel) and by fastening means 18 distributed along said base section 1 and arranged between the section sections 2 consecutive.
  • the transverse edges facing 2D and 2G of two consecutive sections 2 comprise notches 19D and 19G for accommodating said fastening means 18, which are independent of the fixing means 9.
  • Each fastening means 18 comprises a rigid or semi-rigid connection, which is in this embodiment in the form of a metal strip 20, forming a loop enclosing the pyrotechnic cord 3.
  • the ends 20E of the metal strip 20 are fixed said base profile 1 by a bolt 21, the screw 21 V through said ends 20E and the base profile 1 and the nut 21 E clamps said ends 20E against the latter section, preserving a clearance level clamping said ends 20E to allow the metal strip 20 to translate vertically and to prevent it from breaking during the activation of the pyrotechnic cord 3.
  • a spacer plate 22 is disposed between said ends 20E of the metal strip 20 and a clamping back-plate 23 is disposed between the nut 21 E and the ends 20E.
  • a positioning stud 24 is disposed between the spacer plate 22 and the pyrotechnic cord 3.
  • Such a positioning pad 24 guarantees the integrity of the pyrotechnic cord 3, during its operation, by isolating it.
  • a game 14 may, for example, be of the order of a few tenths of a mm.
  • the detonating cord 3 At its ignition, the detonating cord 3 generates shock waves orthogonal to itself, these waves ensuring the speed of its envelope 13 and leading to the expansion of the section of the latter.
  • the envelope 13 Under the effect of the detonation, the envelope 13 is accelerated by a shock wave, the clearance 14, parallel to the direction E, allowing this envelope 13 to acquire a homogeneous speed sufficient to generate, during its impact. on the profiles 1 and 2, a shock wave capable of speeding the corresponding walls of said profiles.
  • the setting in motion of the section 1 initiates the breaking thereof along a line of rupture starting from said bottom groove 7A, with a small radius of curvature, of the groove 7 and opening into the end-of-rupture groove 8.
  • the clearance 12 between the inclined facets 5 and 11 allows the anvil profile sections 2 to acquire a homogeneous speed sufficient to generate, during their impact with the heel 4, a shock wave capable of speeding said bead.
  • the movement of the heel 4 of the profile 1 increases the cutting along said breaking line.
  • the force exerted, parallel to the direction E, by the transverse swelling of the pyrotechnic cord has a component, parallel to the face 5 of the heel 4, which is applied to the section 2 and which facilitates the dislocation, parallel to the direction L, of the two parts of the section 1 disposed on either side of said breaking line.
  • this component parallel to the face 5 tends to shear the bolts 9 and to deform them by bending by tilting of the profile sections 2.
  • the section sections 2 bear on the rib 15 the shear said bolts 9 is prevented and only possibly a tilting, of limited amplitude, of the profile sections 2 is produced opposite to the section 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Vibration Dampers (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Connection Of Plates (AREA)
  • Buckles (AREA)
  • Clamps And Clips (AREA)

Claims (6)

  1. Pyrotechnisches Detonationsbruchstück, umfassend:
    - ein erstes Profil (1), das die Basis des Stücks bildet und mit einer vorspringenden Längsrippe (15) sowie einem vorspringenden Längsendstück (4) in Form eines Hakens, der einer Längsrille (7) in seiner Konkavität begrenzt, versehen ist, wobei das Endstück (4) auf der Innenseite seines freien Endes (6) eine erste ebene Längsfacette (5) umfasst, die geneigt ist, wobei sie nach außen zu dem vom Endstück (4) gebildeten Haken divergierend ist;
    - eine pyrotechnische Längsschnur (3), die in der Rille (7) angeordnet ist; und
    - ein zweites Profil, das auf das erste Profil (1) aufgesetzt und mit diesem durch erste Befestigungsmittel (9) verbunden ist, die entlang der ersten und zweiten Profile verteilt sind, wobei das zweite Profil mit einem seiner Längsränder auf der vorspringenden Längsrippe (15) mit Hilfe von Keilen (16) aufliegt und auf der Außenseite seines anderen Längsrandes mit einer zweiten geneigten, ebenen, konvergierenden Längsfacette (11) versehen ist, die gegenüber der ersten Facette (5) angeordnet ist, wobei sie von dieser um ein erstes vorbestimmtes Spiel (12) beabstandet ist, wodurch es der zweiten Facette möglich ist, mit der ersten Facette beim Bruch des Stücks zusammenzuwirken, wobei das zweite Profil so die Rille (7) verschließt, in der die pyrotechnische Schnur (3) mit einem zweiten vorbestimmten Spiel (14) parallel zur Stärke (E) der ersten und zweiten Profile angeordnet ist, und geeignet ist, als Amboss für die pyrotechnische Schnur (3) zu dienen,
    dadurch gekennzeichnet, dass:
    - das zweite Profil von einer Vielzahl von aufeinanderfolgenden Profilabschnitten (2) gebildet ist, die nacheinander auf dem ersten Profil (1) durch die ersten Befestigungsmittel (9) befestigt sind, und
    - zwischen den aufeinanderfolgenden Profilabschnitten (2) zweite Befestigungsmittel (18) vorgesehen sind, die entlang des ersten Profils (1) verteilt und von den ersten Befestigungsmitteln (9) unabhängig sind, die es ermöglichen, die pyrotechnische Schnur (3) in Bezug zum ersten Profil (1) zu befestigen und positionieren.
  2. Pyrotechnisches Detonationsbruchstück nach Anspruch 1, dadurch gekennzeichnet, dass die gegenüberliegenden Querendränder (2D, 2G) von zwei aufeinanderfolgenden Profilabschnitten (2) zumindest im Wesentlichen aneinandergrenzend sind, und dass zumindest einer der Querränder (2D, 2G) einen bogenförmigen Ausschnitt (19D, 19G) für die Lagerung des zweiten entsprechenden Befestigungsmittels (18) umfasst.
  3. Pyrotechnisches Detonationsbruchstück nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass jedes der zweiten Befestigungsmittel (18) eine starre oder halbstarre Verbindung (20) umfasst, die eine Schleife bildet, die die pyrotechnische Schnur (3) umschließt, und deren enden (20E) an dem ersten Profil (1) befestigt sind.
  4. Pyrotechnisches Detonationsbruchstück nach Anspruch 3, dadurch gekennzeichnet, dass die starre oder halbstarre Verbindung (20) ein Metallblatt ist.
  5. Pyrotechnisches Detonationsbruchstück nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, dass eine Querverstrebungsplatte (22) zwischen den Enden (20E) der starren oder halbstarren Verbindung (20) angeordnet ist, und dass die Enden (20E) an dem ersten Profil (1) durch mindestens einen Bolzen befestigt sind, dessen Schraube (21V) durch die Enden (20E), die Querverstrebungsplatte (22) und das erste Profil (1) hindurchgeht, und dessen Mutter (21E) die Enden (20E) gegen die Querverstrebungsplatte (22) und das erste Profil (1) drückt.
  6. Pyrotechnisches Detonationsbruchstück nach spruch 5, dadurch gekennzeichnet, dass ein Positionierstück (24) zwischen der Querverstrebungsplatte (22) und der pyrotechnischen Schnur (3) angeordnet ist.
EP11811083.2A 2010-12-22 2011-12-12 Pyrotechnisches bruchstück mit reversibler detonation Active EP2656002B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1005043A FR2969748B1 (fr) 2010-12-22 2010-12-22 Piece a rupture pyrotechnique detonante reversible
PCT/FR2011/052941 WO2012085389A1 (fr) 2010-12-22 2011-12-12 Pièce à rupture pyrotechnique détonante réversible

Publications (2)

Publication Number Publication Date
EP2656002A1 EP2656002A1 (de) 2013-10-30
EP2656002B1 true EP2656002B1 (de) 2014-08-20

Family

ID=44504414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11811083.2A Active EP2656002B1 (de) 2010-12-22 2011-12-12 Pyrotechnisches bruchstück mit reversibler detonation

Country Status (6)

Country Link
US (1) US9062946B2 (de)
EP (1) EP2656002B1 (de)
JP (1) JP5945279B2 (de)
ES (1) ES2513597T3 (de)
FR (1) FR2969748B1 (de)
WO (1) WO2012085389A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10934029B2 (en) * 2017-05-04 2021-03-02 Paragon Space Development Corporation Thermally isolating joint assembly in a space vehicle
US11565835B1 (en) * 2019-02-05 2023-01-31 Stratolaunch, Llc Controlled separation joint

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR507800A (fr) 1919-01-28 1920-09-23 Jean Verdie Système de compteur d'eau ou de liquides quelconques
US3230885A (en) * 1963-01-23 1966-01-25 Thiokol Chemical Corp Explosive separation device
JPS562300A (en) * 1979-06-18 1981-01-10 Nissan Motor Powder type separation mechanism
FR2619738B1 (fr) * 1987-08-31 1993-12-17 Dassault Breguet Aviation Procede pour creer une separation dans une piece a l'aide d'un tube expansible pyrotechnique
US5109749A (en) * 1988-10-25 1992-05-05 Oea, Inc. Explosively actuated separable structure
EP1040312A4 (de) * 1997-12-16 2002-09-04 Lockheed Corp Trennsystem
US5969287A (en) * 1997-12-16 1999-10-19 Lockheed Martin Corporation Separation system
FR2838818B1 (fr) * 2002-04-19 2006-12-08 Eads Launch Vehicules Dispositif de liaison provisoire et de separation pyrotechnique de deux elements, sans rupture
FR2888926B1 (fr) 2005-07-22 2007-09-28 Commissariat Energie Atomique Interferometre ewod
FR2888925B1 (fr) * 2005-07-22 2011-02-25 Eads Space Transp Sas Piece a rupture pyrotechnique detonante
FR2946101B1 (fr) * 2009-05-29 2011-07-01 Astrium Sas Dispositif de liaison provisoire et de separation pyrotechnique de deux ensembles
FR2963803B1 (fr) * 2010-08-10 2017-02-10 Astrium Sas Dispositif de fixation a verrou pyrotechnique

Also Published As

Publication number Publication date
EP2656002A1 (de) 2013-10-30
WO2012085389A1 (fr) 2012-06-28
FR2969748B1 (fr) 2013-01-25
FR2969748A1 (fr) 2012-06-29
ES2513597T3 (es) 2014-10-27
JP2014503785A (ja) 2014-02-13
US9062946B2 (en) 2015-06-23
JP5945279B2 (ja) 2016-07-05
US20130340644A1 (en) 2013-12-26

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