EP2769168A1 - Gasgenerator mit einer sicherheitsvorrichtung für langsame aufwärmung - Google Patents

Gasgenerator mit einer sicherheitsvorrichtung für langsame aufwärmung

Info

Publication number
EP2769168A1
EP2769168A1 EP12775798.7A EP12775798A EP2769168A1 EP 2769168 A1 EP2769168 A1 EP 2769168A1 EP 12775798 A EP12775798 A EP 12775798A EP 2769168 A1 EP2769168 A1 EP 2769168A1
Authority
EP
European Patent Office
Prior art keywords
gas generator
slide
gases
combustion chamber
chamber
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.)
Granted
Application number
EP12775798.7A
Other languages
English (en)
French (fr)
Other versions
EP2769168B1 (de
Inventor
Jean-Marc Besson
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.)
Safran Ceramics SA
Original Assignee
Herakles SA
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 Herakles SA filed Critical Herakles SA
Publication of EP2769168A1 publication Critical patent/EP2769168A1/de
Application granted granted Critical
Publication of EP2769168B1 publication Critical patent/EP2769168B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F42B3/04—Blasting cartridges, i.e. case and explosive for producing gas under pressure
    • 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
    • F42B3/006—Explosive bolts; Explosive actuators
    • 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

Definitions

  • GAS GENERATOR PROVIDED WITH A SECURITY BODY FOR CASES
  • the invention relates to a gas generator, and more particularly to a gas generator comprising a body delimiting at least a portion of a combustion chamber, said part containing a main pyrotechnic charge adapted to generate gases in the combustion chamber. combustion when said charge is initiated in combustion.
  • the gas generator according to the present invention is particularly adapted to be integrated in a device for ejecting a payload, in particular a beacon or a decoy, or in a jack.
  • the term "device to be actuated” means a device in which can be integrated the gas generator according to the invention.
  • a gas generator of the aforementioned type through the initiation of its main pyrotechnic charge, generates in a very short time a large amount of gas inside the combustion chamber. The pressure of the gases inside this chamber can then cause the actuation of the device to be actuated, in particular the displacement of a piston.
  • the main pyrotechnic charge of the generator may ignite inadvertently by auto-ignition. It can then react violently, burn abnormally, and even explode, endangering the surrounding people.
  • the main pyrotechnic charge of a munition is combined with a block of pyrotechnic material forming suitable safety igniter, in case of slow heating, to cause the combustion of the main charge without detonation.
  • the object of the invention is to provide a gas generator of the aforementioned type which, in the event of abnormal heating, avoids the inadvertent initiation of the main pyrotechnic charge as long as the self-ignition temperature of said charge has not been reduced. has not been reached and prevents the operation of the device to be operated.
  • a gas generator comprising a body delimiting at least a portion of a combustion chamber, said part containing a main pyrotechnic charge adapted to generate gases in the combustion chamber when said charge is initiated in combustion, and characterized in that it further comprises a slide located outside said body and defining therewith a second chamber housing a secondary pyrotechnic charge whose self-ignition temperature is lower than that of the pyrotechnic charge main feature, in that a flow passage for the gases out of the combustion chamber is formed in the body, in that the spool closes the gas flow passage when in a first position, and in that, under the effect of gases released by said secondary pyrotechnic charge, the slide is adapted to pass into a second position in which said passage n ' is more closed, allowing the gases contained in the combustion chamber to flow outwards.
  • the gas generator operates as follows: Under the effect of one or more pyrotechnic initiator (s), the combustion of the main charge is initiated. Very quickly, gases from combustion are released into the combustion chamber. Under the effect of pressure, these gases operate the device in which the generator is integrated, for example by causing the movement of a piston communicating with the combustion chamber.
  • the load pyrotechnic secondary housed in the second chamber is not initiated. It does not ignite, so no gas is released into the second chamber. In fact, the drawer remains in its first position, in which it closes the flow passage of gases out of the combustion chamber. The gases can not escape the combustion chamber, it rises very quickly in pressure and causes a sudden and effective actuation of the device to operate.
  • the self-ignition temperature of the secondary pyrotechnic charge is lower than that of the main pyrotechnic charge.
  • the gas generator When the gas generator is subjected to an increase in temperature, especially in case of fire, the pyrotechnic material contained in the second chamber, between the drawer and the body, will therefore be initiated first. It then plays a role of thermal fuse or safety organ, as follows:
  • the secondary pyrotechnic charge will gradually release gases, putting pressure in the second chamber. Under the effect of this pressure, the spool will move from its first position described above to a second position, in which the flow passage of gases out of the combustion chamber is open (ie is no longer closed by the drawer).
  • the gas flow passage prevents the pressure inside the combustion chamber from reaching the threshold of pressure beyond which the device is actuated (for example the pressure threshold beyond which a piston of the device is moved). This ensures that in case of fire, or in all other cases of unexpected heating, the device to be actuated is not started, even when the temperature exceeds the auto-ignition temperature of the pyrotechnic charge main.
  • the secondary pyrotechnic charge forming a thermal fuse
  • the drawer is easily disconnected from the generator body.
  • the drawer is able to move by sliding in a rectilinear trajectory.
  • the drawer could be able to move by pivoting about the axis of the body of the generator.
  • the drawer is coaxial with the body.
  • the body comprises at least a first section having a first diameter and a second section of greater diameter located in the extension of the first, a shoulder being defined between the first and the second section, and the drawer comprises a first adapted portion sliding along the second section and a second part extending radially inwards and whose inner radial face is adapted to slide along the first section, the second chamber being defined between the shoulder and the second part of the drawer .
  • the gas flow passage comprises a plurality of holes distributed over the entire periphery of the body.
  • the drawer has at least one opening adapted to come into communication with the flow passage for the gases when the drawer is in its second position, the gases contained in the combustion chamber can then flow to the outside through said flow passage and said opening.
  • the opening comprises for example a plurality of holes distributed over the circumference of the drawer and each opening on the outer face and on the internal face of the drawer.
  • the gas flow passage consists of corresponding through-holes formed in the thickness of the generator body, it is necessary, in order to ensure the flow of the gases, to ensure proper alignment of the holes of the slide and of those of the body.
  • the opening of the slide comprises a circumferential groove formed on its inner face and at least one hole opening in said groove and on the outer face of said drawer, said groove defining an annular chamber with the body when the drawer is in its first position and being adapted to come into communication with the gas flow passage when the drawer is in its second position. position.
  • the gas flow passage comprises a groove circumferential formed on the outer face of the body and at least one hole opening into said groove and on the inner face of said body, said groove defining an annular chamber with the drawer when it is in its first position and being adapted to come into communication with its opening when the drawer is in its second position. It is also possible that the drawer and the body both comprise circumferential grooves as defined above.
  • the present invention also relates to a device comprising a gas generator as defined above, wherein the gases emitted by the main pyrotechnic charge of the gas generator when it is initiated in combustion, are adapted to actuate said device.
  • the device is therefore adapted to be actuated under the effect of the pressure generated by the gases delivered by the generator.
  • This device to be actuated may for example comprise a device for ejecting a payload or a jack.
  • FIG. 1 shows a partial view, in axial section, of a gas generator according to one embodiment of the present invention, before heating;
  • Figure 2 shows the gas generator of Figure 1, after an abnormal heating.
  • the gas generator 10 as shown in Figure 1 is intended to be integrated with a payload ejection device 22 which will be described in more detail below.
  • the gas generator 10 comprises a body 12, generally cylindrical with axis A in the example shown, and open at one of its axial ends 12b (hereinafter free end).
  • the body 12 houses a main pyrotechnic charge 16 and a pyrotechnic initiator 18 to ignite said charge 16.
  • a plurality of holes 50 is formed in the body 12.
  • the body 12 comprises, from its upstream end 12a towards its free end 12b, a succession of sections 51, 52, 53 of increasing diameter, forming recesses or bearings 54, 55.
  • the body 12 comprises a first section 51 of diameter dl and axial length L1. Downstream of this first section 51, the body 12 comprises a second section 52 of diameter d2 greater than d1 and of length L2, and downstream of this second section 52, a third section 53 of diameter d3 greater than d2 and of length L3. .
  • a first and a second shoulder 54, 55 are respectively defined between the first and the second section 51, 52 and between the second and the third section 52, 53.
  • the gas generator 10 comprises, in addition to the aforementioned elements, a slide 60 surrounding the body 12.
  • the slide 60 is coaxial with the body 12 and able to slide rectilinearly along said body 12, in the direction of axis A.
  • the body 12 and the slide 60 of the gas generator 10 may, for example, be arranged in the following manner:
  • the drawer 60 has a generally annular shape. It comprises a first portion 62 extending axially, slidable along a section 52 of the body 12 (here the second section), and a second portion 64 extending radially inwardly from one end of the first portion 62 and facing an adjacent radial portion of the body 12 (here the first shoulder 54) delimiting with it a security chamber or second chamber 66.
  • the first portion 62 of the slide 60 has, on its inner face, a circumferential groove 70 defining with the body 12 an annular chamber. It further comprises at least one exhaust hole 72, preferably a plurality of holes 72, extending from this circumferential groove 70 and opening onto the external face of the slide 60.
  • the security chamber 66 houses a pyrotechnic material
  • the gas generator 10 is intended to be mounted on a payload ejection device 22, and more particularly an ejection device 22 of the type illustrated in FIG. 1, comprising a main body 14 housing a piston. 30 and a payload 40.
  • the gas generator 10 is mounted by its free end 12b, at an axial end of the main body 14, so that the main body 14 of the ejection device 22 and the body 12 of the gas generator are located in the extension of one another.
  • connection between the free end of the body 12 of the gas generator 10 and the main body 14 of the ejection device 22 is represented in FIG. 1 by the line referenced 21.
  • a radial direction is a direction perpendicular to the axis A and intersecting this axis A.
  • an axial direction is a direction parallel to the axis A.
  • the axial adjectives and radial are used with reference to the aforementioned axial and radial directions.
  • an axial plane is a plane containing the axis A and a radial plane is a plane perpendicular to this axis.
  • upstream and downstream are defined relative to the direction of movement of the piston 30 and the payload 40 along the axis A (from upstream to downstream).
  • the main body 14 is closed, at its upstream end, by a cover 26.
  • the cover 26 is connected directly to the main body 14 by a zone of weakness 24 adapted to break when the pressure applied to it reaches a predetermined sufficient value PI.
  • the body 12 of the generator, the main body 14 of the device and the lid 26 define a combustion chamber 20 housing the main pyrotechnic charge 16.
  • the lid may be omitted, and the combustion chamber 20 may be delimited directly by the piston 30 of the ejection device.
  • a series of first holes 50 is formed in the portion of the body 12 defining at least a portion of the combustion chamber 20 along which slides the slide 60 (here the second section 52). These holes 50, which can be distributed over the entire periphery of the body 12, constitute a flow passage allowing the flow of the gases contained in the combustion chamber 20 out of said chamber.
  • the volume of the safety chamber 66 defined between the slide 60 and the body 12 of the gas generator 10 is minimum.
  • the slide 60 abuts against the second shoulder 55 of the body 12. In this position, the groove 70 does not communicate with the gas flow holes 50 of the body 12 and the slide 60 completely closes these holes 50.
  • the chamber combustion 20 is closed.
  • the pyrotechnic initiator 18 ignites the main charge 16
  • the latter on burning, releases gases.
  • the pressure inside the combustion chamber 20 increases very rapidly, up to a value PI for which the zone of weakness 24 breaks and the seal 26 is detached from the body 14.
  • the piston 30 is suddenly set in motion, ejecting, in its stroke, the payload 40.
  • the temperature of the gas generator 10 increases gradually until a threshold temperature Tl corresponding to the self-ignition temperature of the pyrotechnic material 74 is reached. As indicated above, this temperature is obviously chosen to be lower than that T2 of the main pyrotechnic charge.
  • the pyrotechnic material 74 emits gases, which increase the pressure inside the security chamber 66.
  • a stop 58 limits the travel of the slide 12 to a second limit position shown in FIG.
  • the groove 70 faces the gas flow holes 50 formed in the body 12 of the actuator 10. Through these flow holes 50, the groove 70 and the exhaust holes 72 formed in the drawer 60, the combustion chamber 20 is in fluid communication with the external environment.
  • the main pyrotechnic charge 16 does not light. It remains intact and the device to be operated remains at rest. Only the pyrotechnic material 74 contained in the security chamber 66 has burned and will have to be replaced.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
EP12775798.7A 2011-10-17 2012-10-01 Gasgenerator mit einer sicherheitsvorrichtung für langsame erhitzung Not-in-force EP2769168B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1159344A FR2981443B1 (fr) 2011-10-17 2011-10-17 Generateur de gaz muni d'un organe de securite pour les cas d'echauffements lents
PCT/FR2012/052215 WO2013057404A1 (fr) 2011-10-17 2012-10-01 Generateur de gaz muni d'un organe de securite pour les cas d'echauffements lents

Publications (2)

Publication Number Publication Date
EP2769168A1 true EP2769168A1 (de) 2014-08-27
EP2769168B1 EP2769168B1 (de) 2015-12-16

Family

ID=47071382

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12775798.7A Not-in-force EP2769168B1 (de) 2011-10-17 2012-10-01 Gasgenerator mit einer sicherheitsvorrichtung für langsame erhitzung

Country Status (6)

Country Link
US (1) US9228811B2 (de)
EP (1) EP2769168B1 (de)
CA (1) CA2852611A1 (de)
FR (1) FR2981443B1 (de)
HU (1) HUE026498T2 (de)
WO (1) WO2013057404A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013014811B4 (de) * 2013-09-05 2015-04-09 Diehl Bgt Defence Gmbh & Co. Kg Geschoss

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Publication number Priority date Publication date Assignee Title
FR2490333B1 (fr) * 1980-09-12 1986-05-02 Lacroix E Tous Artifices Cartouche a actionnement pyrotechnique de charge utile avec securite
FR2564965B1 (fr) * 1984-05-25 1988-07-22 Matra Dispositif d'interruption de chaine pyrotechnique sensible a la temperature
DE3519517C2 (de) * 1985-05-31 1987-04-30 Gebrüder Junghans GmbH, 7230 Schramberg Sicherungseinrichtung für einen Zünder
US4714020A (en) * 1987-01-30 1987-12-22 Honeywell Inc. Enabling device for a gas generator of a forced dispersion munitions dispenser
US4991513A (en) * 1990-03-12 1991-02-12 The United States Of America As Represented By The Secretary Of The Navy Carrier projectile with safety vents
DE4105271C1 (de) * 1991-02-20 1992-07-16 Buck Werke Gmbh & Co, 7347 Bad Ueberkingen, De
US5380039A (en) * 1993-09-29 1995-01-10 Trw Vehicle Safety Systems Inc. Air bag inflator
US6213502B1 (en) * 1998-11-24 2001-04-10 Delphi Technologies, Inc. Air bag module with variable inflation
US6439603B2 (en) * 1999-10-13 2002-08-27 Delphi Technologies, Inc. Air bag module with variable inflation
FR2827376B1 (fr) 2001-07-13 2003-12-05 Poudres & Explosifs Ste Nale Allumeur de securite pour element de munition pyrotechnique susceptible d'etre soumis a un echauffement lent
US7025000B1 (en) * 2002-04-11 2006-04-11 The United States Of America As Represented By The Secretary Of The Army Mechanism for reducing the vulnerability of high explosive loaded munitions to unplanned thermal stimuli
FR2857313B1 (fr) * 2003-07-10 2006-11-24 Pyroalliance Dispositif d'amortissement du deplacement d'une piece impliquant un fil metallique
FR2857421B1 (fr) * 2003-07-10 2005-08-19 Pyroalliance Actionneur pyrotechnique a effet de poussee variable
FR2870234B1 (fr) 2004-05-13 2007-02-09 Snpe Materiaux Energetiques Sa Compostion pyrotechnique dosable utilisee comme fusible thermique dans un generateur de gaz et generateur de gaz incluant un compose ayant ladite composition
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Also Published As

Publication number Publication date
WO2013057404A1 (fr) 2013-04-25
HUE026498T2 (en) 2016-06-28
CA2852611A1 (fr) 2013-04-25
US20140338553A1 (en) 2014-11-20
FR2981443A1 (fr) 2013-04-19
EP2769168B1 (de) 2015-12-16
US9228811B2 (en) 2016-01-05
FR2981443B1 (fr) 2013-11-29

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