EP1170568A2 - Deflagration minimization device on a metallic container in case of accidental internal overpressure - Google Patents
Deflagration minimization device on a metallic container in case of accidental internal overpressure Download PDFInfo
- Publication number
- EP1170568A2 EP1170568A2 EP01401693A EP01401693A EP1170568A2 EP 1170568 A2 EP1170568 A2 EP 1170568A2 EP 01401693 A EP01401693 A EP 01401693A EP 01401693 A EP01401693 A EP 01401693A EP 1170568 A2 EP1170568 A2 EP 1170568A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- enclosure
- pyrotechnic system
- overpressure
- ignition
- deflagration
- 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.)
- Withdrawn
Links
- 238000004200 deflagration Methods 0.000 title 1
- 239000000126 substance Substances 0.000 claims abstract description 3
- 239000003380 propellant Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000004880 explosion Methods 0.000 claims description 5
- 230000001960 triggered effect Effects 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 11
- 239000012634 fragment Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 206010061218 Inflammation Diseases 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 208000000260 Warts Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 201000010153 skin papilloma Diseases 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
- F42B39/20—Packages or ammunition having valves for pressure-equalising; Packages or ammunition having plugs for pressure release, e.g. meltable ; Blow-out panels; Venting arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
- F42B39/14—Explosion or fire protection arrangements on packages or ammunition
Definitions
- the present invention relates to a minimization device explosion effects of a metal enclosure in the event of overpressure accidental internal.
- the subject of the present invention is a device making it possible to minimize the explosion effects of a metal enclosure subjected to internal overpressure, for example a missile booster enclosure, overpressure in the event of a fire to which it would be subjected, this device being simple to adapt to different kinds of speakers, while being inexpensive, and effective in almost all cases.
- the device according to the invention comprises a system pyrotechnic fixed to the enclosure which is triggered as soon as there is detection of a phenomenon causing the rise in overpressure in the enclosure, the fire of this pyrotechnic system causing, by heating, the fall limited local mechanical characteristics of the enclosure.
- the present invention is described below with reference to a missile booster subjected to fire in its storage hangar accidental, but it is understood that it is not limited to this alone application, and that it can be implemented in other applications comprising a metal enclosure, already under internal pressure, or containing products which can put it under normal pressure, and overpressure in the event of an accident, this overpressure causing the explosion of the enclosure with violent projection of significant fragments of this enclosure.
- the propellant 1 shown in the single figure comprises essentially an enclosure 2 of circular cylindrical shape enclosing a coaxial inner central channel 3, the space between this channel 3 and enclosure 2 being filled with propellant 4.
- a binding agent 7 (known as "liner"), which is generally made of polybutadiene or polyurethane.
- a box 5 containing a pyrotechnic composition 6 there is fixed on the external face of the enclosure 2 a box 5 containing a pyrotechnic composition 6.
- This composition 6 releases, when ignited, a large amount of calories, sufficient to locally degrade the mechanical properties of enclosure 2 to the point that during the auto-ignition of the propellant 4 due to its heating due to a fire, the pressure thus generated in the enclosure does not have the time to reach a too high value and to provoke the violent reaction supra.
- this internal pressure begins to increase, while remaining relatively low (at a value easily supported by the enclosure under normal conditions)
- the part of the enclosure weakened by the significant heating due to composition 6 opens without practically produce splinters, and lets escape the gases under pressure produced by propellant inflammation.
- composition 6 is propellant or a pyrotechnic composition, and its volume is approximately 10 cm 3 for a steel enclosure, with a thickness of approximately 1.5 mm and length 10 cm.
- the nature and the quantity of composition 6 are adapted to the characteristics of the enclosure 2, and of the propellant 4.
- composition 6 can be either spontaneous by following its heating due to the fire, or triggered by a appropriate firing connected to a thermal sensor fixed to the enclosure 2.
- a layer of thermal insulating material which allows delay the heating of propellant 4 to allow time for composition 6 to sufficiently weaken the local mechanical characteristics of enclosure 2.
- the box 5 with the composition 6 are fixed inside the enclosure 2, in contact with the latter.
- Such a mode of realization although less easy to realize than the embodiment described above, may have advantages in other applications, for example of the fact that the box 5 does not constitute a "wart" outside of the enclosure and therefore is not likely to be torn off accidentally, by example during handling of the enclosure, or does not constitute embarrassment, for example to move the enclosure.
- the device of the invention makes it possible to avoid the violent explosion of an enclosure which either contains products capable of ignite by self-ignition or explode as a result of overheating of the enclosure, or is under internal pressure in normal conditions, but this internal pressure can rise excessively under abnormal conditions (overheating, modification content composition, internal short circuit ).
- the ignition of composition 6 is triggered spontaneously or by a suitable physical or chemical condition sensor ( pressure, temperature, gas sensor ).
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Safety Valves (AREA)
Abstract
Description
La présente invention se rapporte à un dispositif de minimisation des effets déflagrants d'une enceinte métallique en cas de surpression interne accidentelle.The present invention relates to a minimization device explosion effects of a metal enclosure in the event of overpressure accidental internal.
Certains propulseurs de missile, possédant une structure métallique, réagissent violemment quand ils sont soumis à l'épreuve du feu, dû à un incendie environnant. Dans ce cas, un grand nombre d'éclats de la structure métallique, de taille significative, sont violemment projetés à longue distance. Cette réaction est la conjonction de deux phénomènes :
- quelle que soit l'architecture du propulseur, l'échauffement dû à l'incendie provoque la réaction pyrotechnique du propulseur. l'énergie ainsi dégagée provoque une montée en pression dans l'enveloppe du propulseur ;
- simultanément, les propriétés de résistance mécanique de l'enveloppe ne sont pas suffisamment affaiblies par l'incendie. La rupture de l'enveloppe se produit donc à une pression élevée, génératrice d'éclats métalliques importants.
- whatever the architecture of the propellant, the heating due to the fire causes the pyrotechnic reaction of the propellant. the energy thus released causes a rise in pressure in the casing of the propellant;
- at the same time, the mechanical resistance properties of the envelope are not sufficiently weakened by the fire. The rupture of the envelope therefore occurs at high pressure, generating significant metallic fragments.
La présente invention a pour objet un dispositif permettant de minimiser les effets déflagrants d'une enceinte métallique soumise à une surpression interne, par exemple une enceinte de propulseur de missile, mise en surpression en cas d'incendie auquel elle serait soumise, ce dispositif étant simple à adapter à différentes sortes d'enceintes, tout en étant peu onéreux, et efficace dans pratiquement tous les cas.The subject of the present invention is a device making it possible to minimize the explosion effects of a metal enclosure subjected to internal overpressure, for example a missile booster enclosure, overpressure in the event of a fire to which it would be subjected, this device being simple to adapt to different kinds of speakers, while being inexpensive, and effective in almost all cases.
Le dispositif conforme à l'invention comporte un système pyrotechnique fixé à l'enceinte qui est déclenché dès qu'il y a détection d'un phénomène provoquant la montée en surpression dans l'enceinte, la mise à feu de ce système pyrotechnique provoquant, par échauffement, la chute locale limitée des caractéristiques mécaniques de l'enceinte.The device according to the invention comprises a system pyrotechnic fixed to the enclosure which is triggered as soon as there is detection of a phenomenon causing the rise in overpressure in the enclosure, the fire of this pyrotechnic system causing, by heating, the fall limited local mechanical characteristics of the enclosure.
La présente invention sera mieux comprise à la lecture de la description détaillée d'un mode de réalisation, pris à titre d'exemple non limitatif et illustré par le dessin annexé, dont la figure unique est une vue partielle en coupe d'un propulseur de missile muni d'un dispositif conforme à l'invention. The present invention will be better understood on reading the detailed description of an embodiment, taken by way of example not limiting and illustrated by the appended drawing, the single figure of which is a view partial sectional view of a missile propellant fitted with a device conforming to the invention.
La présente invention est décrite ci-dessous en référence à un propulseur de missile soumis, dans son hangar de stockage, à un feu accidentel, mais il est bien entendu qu'elle n'est pas limitée à cette seule application, et qu'elle peut être mise en oeuvre dans d'autres applications comportant une enceinte métallique, déjà sous pression interne, ou bien contenant des produits pouvant la mettre en pression normale, et en surpression en cas d'accident, cette surpression provoquant l'explosion de l'enceinte avec projection violente d'éclats importants de cette enceinte.The present invention is described below with reference to a missile booster subjected to fire in its storage hangar accidental, but it is understood that it is not limited to this alone application, and that it can be implemented in other applications comprising a metal enclosure, already under internal pressure, or containing products which can put it under normal pressure, and overpressure in the event of an accident, this overpressure causing the explosion of the enclosure with violent projection of significant fragments of this enclosure.
Le propulseur 1 représenté en figure unique comporte
essentiellement une enceinte 2 de forme cylindrique circulaire enfermant un
canal central intérieur coaxial 3, l'espace compris entre ce canal 3 et
l'enceinte 2 étant rempli de propergol 4. Afin d'assurer une bonne adhérence
entre le propergol et l'enceinte, on tapisse la face interne de celle-ci avec un
agent de liaison 7 (dit : « liner »), qui est généralement en polybutadiène ou
polyuréthane.The
Selon l'invention, on fixe sur la face externe de l'enceinte 2 un
coffret 5 renfermant une composition pyrotechnique 6. Cette composition 6
dégage, lorsqu'elle est mise à feu, une forte quantité de calories, suffisante
pour dégrader localement les propriétés mécaniques de l'enceinte 2 au point
que lors de l'auto-inflammation du propergol 4 par suite de son échauffement
dû à un incendie, la pression ainsi engendrée dans l'enceinte n'a pas le
temps d'atteindre une valeur trop élevée et de provoquer la réaction violente
précitée. En fait, dès que cette pression interne commence à croítre, tout en
restant relativement basse (à une valeur facilement supportée par l'enceinte
dans des conditions normales), la partie de l'enceinte fragilisée par
l'échauffement important dû à la composition 6 s'ouvre sans pratiquement
produire d'éclats, et laisse s'échapper les gaz sous pression produits par
l'inflammation du propergol.According to the invention, there is fixed on the external face of the enclosure 2 a
Selon un mode de réalisation de l'invention, la composition 6 est
du propergol ou une composition pyrotechnique, et son volume est d'environ
10 cm3 pour une enceinte en acier, d'une épaisseur d'environ 1,5 mm et de
longueur 10 cm. Bien entendu, la nature et la quantité de composition 6 sont
adaptées aux caractéristiques de l'enceinte 2, et du propergol 4. According to one embodiment of the invention,
La mise à feu de la composition 6 peut être soit spontanée par
suite de son échauffement dû à l'incendie, soit déclenché par un dispositif de
mise à feu approprié relié à un capteur thermique fixé à l'enceinte 2.The ignition of
Selon une autre caractéristique de l'invention, on dispose autour
de l'enceinte une couche de matériau isolant thermique qui permet de
retarder l'échauffement du propergol 4 pour laisser le temps à la composition
6 d'affaiblir suffisamment les caractéristiques mécaniques locales de
l'enceinte 2.According to another characteristic of the invention, around
of the enclosure a layer of thermal insulating material which allows
delay the heating of propellant 4 to allow time for
Selon une variante de l'invention, le coffret 5 avec la composition
6 sont fixés à l'intérieur de l'enceinte 2, au contact de celle-ci. Un tel mode de
réalisation, bien que moins simple à réaliser que le mode de réalisation décrit
ci-dessus, peut présenter des avantages dans d'autres applications, par
exemple du fait que le coffret 5 ne constitue pas de « verrue » à l'extérieur de
l'enceinte et donc ne risque pas d'être arraché accidentellement, par
exemple au cours de manipulations de l'enceinte, ou ne constitue pas de
gêne, par exemple pour déplacer l'enceinte.According to a variant of the invention, the
De façon générale, le dispositif de l'invention permet d'éviter
l'explosion violente d'une enceinte qui, soit contient des produits pouvant
s'enflammer par auto-inflammation ou exploser par suite d'un
suréchauffement de l'enceinte, soit est sous pression interne dans des
conditions normales, mais cette pression interne pouvant s'élever
exagérément dans des conditions anormales (suréchauffement, modification
de la composition du contenu, court-circuit interne ...). Dans de tels cas, la
mise à feu de la composition 6 est déclenchée spontanément ou par un
capteur de conditions physiques ou chimiques approprié (capteur de
pression, de température, capteur de gaz ...).In general, the device of the invention makes it possible to avoid
the violent explosion of an enclosure which either contains products capable of
ignite by self-ignition or explode as a result of
overheating of the enclosure, or is under internal pressure in
normal conditions, but this internal pressure can rise
excessively under abnormal conditions (overheating, modification
content composition, internal short circuit ...). In such cases, the
ignition of
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0008516 | 2000-06-30 | ||
| FR0008516A FR2811053B1 (en) | 2000-06-30 | 2000-06-30 | DEVICE FOR MINIMIZING THE EXPLOSION EFFECTS OF A METAL ENCLOSURE IN THE EVENT OF ACCIDENTAL INTERNAL OVERPRESSURE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1170568A2 true EP1170568A2 (en) | 2002-01-09 |
| EP1170568A3 EP1170568A3 (en) | 2002-04-03 |
Family
ID=8851961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01401693A Withdrawn EP1170568A3 (en) | 2000-06-30 | 2001-06-26 | Deflagration minimization device on a metallic container in case of accidental internal overpressure |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20020020323A1 (en) |
| EP (1) | EP1170568A3 (en) |
| FR (1) | FR2811053B1 (en) |
| NO (1) | NO20013225L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2908506A1 (en) * | 2006-11-14 | 2008-05-16 | Protac | Protection system for e.g. rocket engine, has tank for containing detonate substance, pipe for supplying substance to section for activating section, and control transmission line connecting sensor to section |
| EP2113733A1 (en) * | 2008-04-30 | 2009-11-04 | Saab Ab | Weapon with IM-characteristics |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6952995B2 (en) * | 2002-01-11 | 2005-10-11 | Aerojet-General Corporation | Apparatus and method for passive venting of rocket motor or ordnance case |
| US7530314B2 (en) * | 2004-05-25 | 2009-05-12 | Lockheed Martin Corporation | Thermally initiated venting system and method of using same |
| DE102004038039A1 (en) * | 2004-08-05 | 2006-02-23 | Diehl Bgt Defence Gmbh & Co. Kg | rocket engine |
| US7472653B1 (en) * | 2006-06-15 | 2009-01-06 | United States Of America As Represented By The Secretary Of The Navy | Insensitive munitions warhead explosive venting system |
| US9255774B2 (en) | 2008-06-30 | 2016-02-09 | Battelle Memorial Institute | Controlled fragmentation of a warhead shell |
| FR2948186B1 (en) * | 2009-07-17 | 2015-02-20 | Tda Armements Sas | AMMUNITION COMPRISING MEANS FOR NEUTRALIZING ITS EXPLOSIVE LOADING |
| US10670381B1 (en) * | 2013-09-17 | 2020-06-02 | The United States Of America, As Represented By The Secretary Of The Navy | Electronic thermally-initiated venting system (ETIVS) for rocket motors |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4478151A (en) * | 1983-02-28 | 1984-10-23 | The United States Of America As Represented By The Secretary Of The Navy | Pressure vessel penetrator |
| US4597261A (en) * | 1984-05-25 | 1986-07-01 | Hughes Aircraft Company | Thermally actuated rocket motor safety system |
| US5129326A (en) * | 1987-04-14 | 1992-07-14 | Aerojet-General Corporation | Ordnance device with explosion protection |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5206456A (en) * | 1989-08-24 | 1993-04-27 | The United States Of America As Represented By The Secretary Of The Navy | Ordinance thermal battery |
-
2000
- 2000-06-30 FR FR0008516A patent/FR2811053B1/en not_active Expired - Fee Related
-
2001
- 2001-06-26 EP EP01401693A patent/EP1170568A3/en not_active Withdrawn
- 2001-06-27 NO NO20013225A patent/NO20013225L/en not_active Application Discontinuation
- 2001-06-29 US US09/893,448 patent/US20020020323A1/en not_active Abandoned
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4478151A (en) * | 1983-02-28 | 1984-10-23 | The United States Of America As Represented By The Secretary Of The Navy | Pressure vessel penetrator |
| US4597261A (en) * | 1984-05-25 | 1986-07-01 | Hughes Aircraft Company | Thermally actuated rocket motor safety system |
| US5129326A (en) * | 1987-04-14 | 1992-07-14 | Aerojet-General Corporation | Ordnance device with explosion protection |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2908506A1 (en) * | 2006-11-14 | 2008-05-16 | Protac | Protection system for e.g. rocket engine, has tank for containing detonate substance, pipe for supplying substance to section for activating section, and control transmission line connecting sensor to section |
| EP1923659A1 (en) | 2006-11-14 | 2008-05-21 | Protac | Protection system for a device containing a material reacting violently to heat |
| EP2113733A1 (en) * | 2008-04-30 | 2009-11-04 | Saab Ab | Weapon with IM-characteristics |
| US7913608B1 (en) | 2008-04-30 | 2011-03-29 | Saab Ab | Weapon with IM-characteristics |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2811053B1 (en) | 2003-06-13 |
| EP1170568A3 (en) | 2002-04-03 |
| NO20013225D0 (en) | 2001-06-27 |
| NO20013225L (en) | 2001-12-31 |
| FR2811053A1 (en) | 2002-01-04 |
| US20020020323A1 (en) | 2002-02-21 |
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