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WO1997006988A1 - Arrangement for opening the exploding membrane of compressed gas bottles in gas generators - Google Patents

Arrangement for opening the exploding membrane of compressed gas bottles in gas generators Download PDF

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Publication number
WO1997006988A1
WO1997006988A1 PCT/EP1996/003392 EP9603392W WO9706988A1 WO 1997006988 A1 WO1997006988 A1 WO 1997006988A1 EP 9603392 W EP9603392 W EP 9603392W WO 9706988 A1 WO9706988 A1 WO 9706988A1
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WO
WIPO (PCT)
Prior art keywords
bursting membrane
explosive
gas
membrane
arrangement
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.)
Ceased
Application number
PCT/EP1996/003392
Other languages
German (de)
French (fr)
Inventor
Franz Fürst
Harald Seidel
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.)
ZF Airbag Germany GmbH
Original Assignee
Temic Bayern Chemie Airbag GmbH
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 Temic Bayern Chemie Airbag GmbH filed Critical Temic Bayern Chemie Airbag GmbH
Publication of WO1997006988A1 publication Critical patent/WO1997006988A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/268—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous release of stored pressurised gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K13/00—Other constructional types of cut-off apparatus; Arrangements for cutting-off
    • F16K13/04—Other constructional types of cut-off apparatus; Arrangements for cutting-off with a breakable closure member
    • F16K13/06—Other constructional types of cut-off apparatus; Arrangements for cutting-off with a breakable closure member constructed to be ruptured by an explosion

Definitions

  • the invention relates to an arrangement for opening the bursting membrane of compressed gas cylinders in gas generators according to the preamble of claim 1.
  • Restraint systems which are equipped with a gas bag (airbag) which is inflated by a gas generated by a gas generator.
  • the hybrid gas generator ignites and heats the gas by burning suitable pyrotechnic propellants.
  • Hybrid gas generators consist of a container filled with gas. Because this gas does not have to be generated pyrotechnically, it is called cold gas.
  • the gas container is under pressure and is therefore also called a compressed gas bottle.
  • the container is closed by a closure in the form of a bursting membrane.
  • the bursting membrane can be opened in different ways in the event of a release.
  • an igniter that projects into the combustion chamber can ignite a fuel assembly in the form of, for example, propellant disks, which generates a hot gas, which then welds the bursting membrane or damages it due to the high pressure.
  • the explosion of the propellant disks can accelerate projectiles or bolts, which then mechanically destroy the bursting membrane.
  • the cold gas escapes from the container. Hot gas and cold gas mix and escape to the outside through a discharge opening, where they are used to inflate a gas bag or are fed to another consumer.
  • Liquid gas generators are also known, the bursting membrane of which is destroyed in the manner described above
  • the object of the invention is therefore to open the bursting membrane of compressed gas cylinders in gas generators quickly and easily.
  • the advantages achieved by the invention are, in particular, that the bursting membrane is opened quickly and in a defined manner in comparison to conventional solutions, that the construction of gas generators which operate according to the compressed gas cylinder principle is simplified, and thus less expensive production can be achieved.
  • Bonded explosive cushion Figure 2a Construction of a bursting membrane according to the invention
  • Detonating wire and holder Figure 2b Construction according to the invention of a bursting membrane with
  • Detonating cushion and holder Figure 3a Structure according to the invention of a bursting membrane with explosive wire pressed into a groove
  • FIG. 3b Construction of a bursting membrane according to the invention
  • Figure 1a shows a bursting membrane 1 on which an explosive wire 2 has been arranged in a circle.
  • the connection between the bursting membrane 1 and the explosive wire 2 is produced by adhesive 15.
  • Figure 1b shows a bursting membrane 1 on which an explosive cushion 18 is attached.
  • the connection between the bursting membrane 1 and the explosive cushion 18 is produced by adhesive 15.
  • FIG. 2a shows a bursting membrane 1 on which an explosive wire 2 has been arranged in a slightly spiral.
  • the connection between the bursting membrane 1 and the explosive wire 2 is achieved by a holder 17, which fixes the explosive wire 2 to the bursting membrane 1, so that the explosive wire 2 is clamped between the holder 17 and the bursting membrane 1.
  • FIG. 2b shows a bursting membrane 1 on which an explosive cushion 18 is attached.
  • the connection between the bursting membrane 1 and the explosive cushion 18 is achieved by a holder 17 which fixes the explosive wire 2 to the bursting membrane 1, so that the sprinkling cushion 18 is clamped between the holder 17 and the bursting membrane 1.
  • FIG. 3a shows a bursting membrane 1 on which an explosive wire 2 has been arranged in a spiral. There is a groove 16 in the bursting membrane 1. The explosive wire 2 can be inserted into this groove 16 and fixed with the bursting membrane 1.
  • FIG. 3b shows a bursting membrane 1 on which an explosive cushion 18 is attached. There is a groove 16 in the bursting membrane 1. The explosive cushion 18 can be inserted into this groove 16 and fixed with the bursting membrane 1.
  • Figure 4a shows the actual structure of the explosive wire in cross section.
  • the explosive wire has a pyrotechnic core 4 inside, which ignites when heated.
  • This pyrotechnic core 4 is covered with a jacket 3, which protects the pyrotechnic core 4, gives it the desired shape and simplifies the attachment of the explosive 4 to the bursting membrane 1.
  • the heat-sensitive material of the jacket 3 can be, for example, metal or plastic. It is advantageous to choose a flexible jacket with an equally flexible pyrotechnic core, so that the explosive wire can be attached to the bursting membrane in any shape.
  • Figure 4b shows the actual structure of the explosive cushion in cross section.
  • the explosive cushion has a pyrotechnic filling 4 on the inside, which ignites when heated.
  • This pyrotechnic filling 4 is surrounded by a sheath 3, which protects the pyrotechnic filling 4, gives it the desired shape and simplifies the attachment of the explosive 4 to the bursting membrane 1.
  • the heat-sensitive material of the jacket 3 can be, for example, metal or plastic. It is advantageous to choose a flexible sleeve with an equally flexible pyrotechnic filling, so that the explosive cushion can be attached to the bursting membrane in any shape.
  • FIG. 5 shows a compressed gas bottle filled with combustible gas in a gas generator with a bursting membrane according to the invention.
  • a combustible gas 5 inside the gas container 6.
  • the gas container 6 is closed by the bursting membrane 1 and is under pressure.
  • the explosive wire 2 is attached to the bursting membrane 1. This protrudes into the ignition chamber 7, which is formed by an ignition tube 11.
  • an ignition carrier 10 on which the igniter 9 is attached, which projects into the ignition chamber 7.
  • outlet openings 12 are provided on the ignition tube 11. These outlet openings 12 are covered with a dam 8.
  • a bridge wire melts in the igniter 9, which in turn ignites one or more pyrotechnic charges in the igniter itself.
  • the high pressure which arises when the pyrotechnic charges burn off opens the igniter 9 and hot gases and particles emerge from the igniter. These hot gases and particles hit the sheath of the explosive wire 2. This melts or is broken through and its pyrotechnic soul can ignite. When this charge burns up, high pressures and temperatures are generated which, due to the arrangement of the explosive wire 2 on the bursting membrane 1, have a direct effect on its mechanical strength.
  • FIG. 6 shows a compressed gas bottle filled with inert gas in a gas generator with a bursting membrane according to the invention.
  • An inert gas 13 is located inside the gas container 6.
  • the gas container 6 is closed by the bursting membrane 1 and is under pressure.
  • the explosive wire 2 is attached to the bursting membrane 1. This protrudes into the ignition chamber 7, which is formed by an ignition tube 11. In this ignition chamber there is also one or more propellant charges 14. In the ignition tube 11 there is an ignition carrier 10 on which the igniter 9 is attached, which projects into the ignition chamber 7. Furthermore, outlet openings 12 are provided on the ignition tube 11. These outlet openings 12 are covered with a dam 8.
  • a so-called bridge wire melts in the igniter 9, which in turn ignites one or more pyrotechnic charges in the igniter itself.
  • the high pressure which arises when the pyrotechnic charges burn off opens the igniter 9 and hot gases and particles emerge from the igniter. These hot particles and particles hit the sheath of the explosive wire 2.
  • this charge burns up, high pressures and temperatures are generated which, due to the arrangement of the explosive wire 2 on the bursting membrane 1, have a direct effect on its mechanical strength.
  • the action of the high pressures and temperatures weaken the bursting membrane 1 in such a way that it can no longer withstand the pressure of the gas in the compressed gas bottle 6.
  • the bursting membrane 1 bursts and gas 13 flows from the compressed gas container 6 into the ignition chamber 7, where at the same time the propellant charge 14 was ignited with the explosive wire 2.
  • the hot gas formed when the propellant charge 14 burns up mixes with the cold gas from the compressed gas bottle 6 in the ignition chamber 7.
  • the mixed gas flows outward through the outlet openings 12 after the dam 8 of the ignition tube 11 has been opened.
  • Another variant, not shown, also results from the fact that the preferably metallic sheath 3 of the explosive wire 2 or sheath 3 of the explosive cushion 18 is connected to an electrical energy source.
  • the core 4 of the explosive wire 2 or the filling 4 of the explosive cushion 18 can also be ignited independently of the igniter 9, for example by a current flow, by heating the casing 3 or by generating sparks inside the casing 3, the explosive 4 on the bursting membrane 1 ignites.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Air Bags (AREA)

Abstract

The invention describes an arrangement for opening the exploding membrane of compressed gas bottles in gas generators, in particular for passive restraint systems. With previous systems, the exploding membrane was either punctured by projectiles or bolts, damaged by high pressure, or melted open by a flow of hot gas. According to the invention, a pyrotechnical explosive, preferably in the form of a detonating wire (2) or detonating pad (18) surrounding the pyrotechnical filling (4) with a casing (3), are disposed on an exploding membrane (1) and connected thereto. Owing to the effect of heating or a flow in the casing (3), the pyrotechnical filling (4) is ignited and thus destroys the exploding membrane (1). The invention enables the exploding membrane (1) to be opened very rapidly and in a highly specific manner.

Description

ANORDNUNGZUMÖFFNENDERBERSTMEMBRAN VON DRUCKGASFLASCHENINGASGENERATOREN ARRANGEMENT OF OPENING RUBBER MEMBRANE OF COMPRESSED GAS BOTTLE GAS GENERATORS

Die Erfindung betrifft eine Anordnung zum Öffnen der Berstmembran von Druckgasflaschen in Gasgeneratoren nach dem Oberbegriff der Patentanspruches 1.The invention relates to an arrangement for opening the bursting membrane of compressed gas cylinders in gas generators according to the preamble of claim 1.

Es sind Rückhaltesysteme bekannt, die mit einem Gassack (Airbag) ausgestattet sind, der durch ein, von einem im Gasgenerator erzeugten Gas aufgeblasen wird. Beim Hybrid-Gasgenerator erfolgt die Zündung und Gaserwärmung durch Verbrennung geeigneter pyrotechnischer Treibmittel. Hybrid-Gasgeneratoren bestehen aus einem mit Gas gefüllten Behälter. Weil dieses Gas nicht erst pyrotechnisch erzeugt werden muß, wird es als Kaltgas bezeichnet. Der Gasbehälter steht unter Druck und wird deshalb auch als Druckgasflasche bezeichnet. Um das vorzeitige Ausströmen des Gases zu verhindern ist der Behälter durch einen Verschluß in Form einer Berstmembran verschlossen. Die Berstmembran kann im Falle einer Auslösung auf verschiedene Weise geöffnet werden. Einerseits kann im Hybrid-Gasgenerator durch einen Anzünder, der in die Brennkammer ragt ein Brennsatz in Form von z.B. Treibsatzscheiben gezündet werden, der ein Heißgas erzeugt, welches dann die Berstmembran aufschweißt oder durch den hohen Druck beschädigt. Andererseits können durch die Explosion der Treibsatzscheiben Projektile oder Bolzen beschleunigt werden, die dann die Berstmembran mechanisch zerstören. Nach dem Öffnen der Berstmembran, entweicht das Kaltgas aus dem Behälter. Heißgas und Kaltgas vermischen sich und entweichen durch eine Abströmöffnung nach außen, wo sie zum Aufblasen eines Gassackes dienen oder einem anderen Verbraucher zugeführt werden. Auch sind Flüssigkeitsgasgeneratoren bekannt, deren Berstmembran auf die vorher beschriebene Weise zerstört wirdRestraint systems are known which are equipped with a gas bag (airbag) which is inflated by a gas generated by a gas generator. The hybrid gas generator ignites and heats the gas by burning suitable pyrotechnic propellants. Hybrid gas generators consist of a container filled with gas. Because this gas does not have to be generated pyrotechnically, it is called cold gas. The gas container is under pressure and is therefore also called a compressed gas bottle. In order to prevent the gas from escaping prematurely, the container is closed by a closure in the form of a bursting membrane. The bursting membrane can be opened in different ways in the event of a release. On the one hand, in the hybrid gas generator, an igniter that projects into the combustion chamber can ignite a fuel assembly in the form of, for example, propellant disks, which generates a hot gas, which then welds the bursting membrane or damages it due to the high pressure. On the other hand, the explosion of the propellant disks can accelerate projectiles or bolts, which then mechanically destroy the bursting membrane. After opening the bursting membrane, the cold gas escapes from the container. Hot gas and cold gas mix and escape to the outside through a discharge opening, where they are used to inflate a gas bag or are fed to another consumer. Liquid gas generators are also known, the bursting membrane of which is destroyed in the manner described above

Nachteilig an diesen Anordnungen ist jedoch, daß sowohl Projektile als auch Bolzen geführt und aufgefangen werden müssen und dadurch aufwendige Konstruktionen benötigt werden. Im Falle des Aufschweißens werden, zur Bündelung des Gasstromes auf die Membran, Düsenplatten oder andere aufwendige Konstruktionen benötigt. Eine weiterer Nachteil liegt darin, daß die Zeitspanne, von der Zündung ab bis zum Öffnen der Membran, sehr lang ist.A disadvantage of these arrangements, however, is that both projectiles and bolts have to be guided and collected, which means that complex constructions are required. In the case of welding, bundling of the gas flow onto the membrane, nozzle plates or other complex constructions are required. Another disadvantage is that the time from ignition to opening of the membrane is very long.

Der Erfindung liegt daher die Aufgabe zugrunde die Berstmembran von Druckgasflaschen in Gasgeneratoren schnell und einfach zu öffnen.The object of the invention is therefore to open the bursting membrane of compressed gas cylinders in gas generators quickly and easily.

Diese Aufgabe wird erfindungsgemaß durch die kennzeichnenden Merkmale des Patentanspruches 1 gelöst. Hiernach wird der Membran der Druckgasflasche mittels einer Sprengvorrichtung geöffnet, die direkt auf oder in der Berstmembran angebracht ist.This object is achieved by the characterizing features of claim 1. Then the membrane of the compressed gas bottle is opened by means of a blasting device which is attached directly to or in the bursting membrane.

Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen. Hier werden verschiedene Sprengvorrichtungen (Sprengdraht, Sprengkissen) und Aufbauten beansprucht mit denen die Sprengvorrichtung an der Berstmembran befestigt und ausgelöst werden kann.Advantageous developments of the invention result from the dependent claims. Various explosive devices (explosive wire, detonating pillow) and structures are used here with which the explosive device can be attached to the bursting membrane and triggered.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß im Vergleich zu herkömmlichen Lösungen die Berstmembran schnell und definiert geöffnet wird, daß der Aufbau von Gasgeneratoren, die nach dem Druckgasflaschenprinzip arbeiten, vereinfacht wird und somit eine kostengünstigere Fertigung erzielt werden kann.The advantages achieved by the invention are, in particular, that the bursting membrane is opened quickly and in a defined manner in comparison to conventional solutions, that the construction of gas generators which operate according to the compressed gas cylinder principle is simplified, and thus less expensive production can be achieved.

Die Ausführungsbeispiele der Erfindung und ihre vorteilhaften Weiterbildungen werden im folgenden anhand mehrerer Zeichnungen dargestellt. Figur 1a: Erfindungsgemäßer Aufbau einer Berstmembran mitThe exemplary embodiments of the invention and their advantageous developments are illustrated below with the aid of several drawings. Figure 1a: Construction of a bursting membrane according to the invention

Sprengdraht geklebt Figur 1b: Erfindungsgemäßer Aufbau einer Berstmembran mitExplosive wire glued Figure 1b: Construction of a bursting membrane according to the invention

Sprengkissen geklebt Figur 2a: Erfindungsgemäßer Aufbau einer Berstmembran mitBonded explosive cushion Figure 2a: Construction of a bursting membrane according to the invention

Sprengdraht und Halterung Figur 2b: Erfindungsgemäßer Aufbau einer Berstmembran mitDetonating wire and holder Figure 2b: Construction according to the invention of a bursting membrane with

Sprengkissen und Halterung Figur 3a: Erfindungsgemäßer Aufbau einer Berstmembran mit Sprengdraht in eine Nut eingepreßtDetonating cushion and holder Figure 3a: Structure according to the invention of a bursting membrane with explosive wire pressed into a groove

Figur 3b: Erfindungsgemäßer Aufbau einer Berstmembran mitFigure 3b: Construction of a bursting membrane according to the invention

Sprengkissen in eine Nut eingepreßt Figur 4a: Querschnitt des Sprengdrahtes Figur 4b: Querschnitt des Sprengkissens Figur 5 : Hybrid-Gasgenerator mit erfindungsgemäßer Berstmembran gefüllt mit brennbarem Gas Figur 6 : Hybrid-Gasgenerator mit erfindungsgemäßer Berstmembran gefüllt mit inertem GasDetonating pillow pressed into a groove Figure 4a: cross section of the detonating wire Figure 4b: cross section of the detonating pillow Figure 5: hybrid gas generator with a bursting membrane according to the invention filled with flammable gas Figure 6: hybrid gas generator with a bursting membrane according to the invention filled with inert gas

Figur 1a zeigt eine Berstmembran 1 auf der ein Sprengdraht 2 kreisförmig angeordnet wurde. Die Verbindung zwischen Berstmembran 1 und Sprengdraht 2 wird durch Klebstoff 15 hergestellt.Figure 1a shows a bursting membrane 1 on which an explosive wire 2 has been arranged in a circle. The connection between the bursting membrane 1 and the explosive wire 2 is produced by adhesive 15.

Figur 1b zeigt eine Berstmembran 1 auf der ein Sprengkissen 18 angebracht ist. Die Verbindung zwischen Berstmembran 1 und Sprengkissen 18 wird durch Klebstoff 15 hergestellt.Figure 1b shows a bursting membrane 1 on which an explosive cushion 18 is attached. The connection between the bursting membrane 1 and the explosive cushion 18 is produced by adhesive 15.

Figur 2a zeigt eine Berstmembran 1 auf der ein Sprengdraht 2 leicht spiralförmig angeordnet wurde. Die Verbindung zwischen Berstmembran 1 und Sprengdraht 2 wird durch eine Halterung 17 erzielt, die den Sprengdraht 2 an der Berstmembran 1 fixiert, so daß der Sprengdraht 2 zwischen Halterung 17 und Berstmembran 1 eingeklemmt ist. Figur 2b zeigt eine Berstmembran 1 auf der ein Sprengkissen 18 angebracht ist. Die Verbindung zwischen Berstmembran 1 und Sprengkissen 18 wird durch eine Halterung 17 erzielt, die den Sprengdraht 2 an der Berstmembran 1 fixiert, so daß das Sprengkissen 18 zwischen Halterung 17 und Berstmembran 1 eingeklemmt ist.FIG. 2a shows a bursting membrane 1 on which an explosive wire 2 has been arranged in a slightly spiral. The connection between the bursting membrane 1 and the explosive wire 2 is achieved by a holder 17, which fixes the explosive wire 2 to the bursting membrane 1, so that the explosive wire 2 is clamped between the holder 17 and the bursting membrane 1. FIG. 2b shows a bursting membrane 1 on which an explosive cushion 18 is attached. The connection between the bursting membrane 1 and the explosive cushion 18 is achieved by a holder 17 which fixes the explosive wire 2 to the bursting membrane 1, so that the sprinkling cushion 18 is clamped between the holder 17 and the bursting membrane 1.

Figur 3a zeigt eine Berstmembran 1 auf der ein Sprengdraht 2 spiralförmig angeordnet wurde. In der Berstmembran 1 befindet sich eine Nut 16. In diese Nut 16 kann der Sprengdraht 2 eingelegt und mit dem Berstmembran 1 fixiert werden.FIG. 3a shows a bursting membrane 1 on which an explosive wire 2 has been arranged in a spiral. There is a groove 16 in the bursting membrane 1. The explosive wire 2 can be inserted into this groove 16 and fixed with the bursting membrane 1.

Figur 3b zeigt eine Berstmembran 1 auf der ein Sprengkissen 18 angebracht ist. In der Berstmembran 1 befindet sich eine Nut 16. In diese Nut 16 kann das Sprengkissen 18 eingelegt und mit dem Berstmembran 1 fixiert werden.FIG. 3b shows a bursting membrane 1 on which an explosive cushion 18 is attached. There is a groove 16 in the bursting membrane 1. The explosive cushion 18 can be inserted into this groove 16 and fixed with the bursting membrane 1.

Figur 4a zeigt den eigentlichen Aufbau des Sprengdrahtes im Querschnitt. Der Sprengdraht besitzt im Innern eine pyrotechnische Seele 4, welche sich bei Erwärmung entzündet. Diese pyrotechnische Seele 4 ist umhüllt mit einem Mantel 3, der die pyrotechnische Seele 4 schützt, ihr die gewünschte Form gibt und die Anbringung des Sprengstoffes 4 an die Berstmembran 1 vereinfacht. Das auf Wärme empfindliche Material des Mantels 3 kann beispielsweise Metall oder Kunststoff sein. Von Vorteil ist die Wahl eines flexiblen Mantels mit einem ebenfalls flexiblen pyrotechnischen Seele, so daß der Sprengdraht in beliebiger Form auf die Berstmembran angebracht werden kann.Figure 4a shows the actual structure of the explosive wire in cross section. The explosive wire has a pyrotechnic core 4 inside, which ignites when heated. This pyrotechnic core 4 is covered with a jacket 3, which protects the pyrotechnic core 4, gives it the desired shape and simplifies the attachment of the explosive 4 to the bursting membrane 1. The heat-sensitive material of the jacket 3 can be, for example, metal or plastic. It is advantageous to choose a flexible jacket with an equally flexible pyrotechnic core, so that the explosive wire can be attached to the bursting membrane in any shape.

Figur 4b zeigt den eigentlichen Aufbau des Sprengkissens im Querschnitt. Das Sprengkissen besitzt im Innern eine pyrotechnische Füllung 4, welche sich bei Erwärmung entzündet. Diese pyrotechnische Füllung 4 ist von einer Hülle 3 umgeben, der die pyrotechnische Füllung 4 schützt, ihr die gewünschte Form gibt und die Anbringung des Sprengstoffes 4 an die Berstmembran 1 vereinfacht. Das auf Wärme empfindliche Material des Mantels 3 kann beispielsweise Metall oder Kunststoff sein. Von Vorteil ist die Wahl eines flexiblen Hülle mit einer ebenfalls flexiblen pyrotechnischen Fülle, so daß das Sprengkissen in beliebiger Form auf der Berstmembran angebracht werden kann.Figure 4b shows the actual structure of the explosive cushion in cross section. The explosive cushion has a pyrotechnic filling 4 on the inside, which ignites when heated. This pyrotechnic filling 4 is surrounded by a sheath 3, which protects the pyrotechnic filling 4, gives it the desired shape and simplifies the attachment of the explosive 4 to the bursting membrane 1. The heat-sensitive material of the jacket 3 can be, for example, metal or plastic. It is advantageous to choose a flexible sleeve with an equally flexible pyrotechnic filling, so that the explosive cushion can be attached to the bursting membrane in any shape.

Figur 5 zeigt eine mit brennbarem Gas gefüllte Druckgasflasche in einem Gasgenerator mit erfindungsgemäßer Berstmembran. Im Innern des Gasbehälters 6 befindet sich ein brennbares Gas 5. Der Gasbehälter 6 ist durch die Berstmembran 1 verschlossen und steht unter Druck. Auf der Berstmembran 1 ist der Sprengdraht 2 angebracht. Dieser ragt in die Anzündkammer 7, welche von einem Anzündrohr 11 ausgebildet wird. Im Anzündrohr 11 befindet sich ein Anzündträger 10 auf dem der Anzünder 9 angebracht ist, welcher in die Anzündkammer 7 ragt. Weiterhin sind am Anzündrohr 11 Austrittsöffnungen 12 angebracht. Diese Austrittsöffnungen 12 sind mit einer Verdammung 8 bedeckt. Wird nun der Anzünder 9 z.B. durch einen Stromstoß aktiviert, so schmilzt im Anzünder 9 ein Brückendraht, der wiederum eine oder mehrere pyrotechnische Ladungen im Anzünder selbst entzündet. Der beim Abbrand der pyrotechnischen Ladungen entstehende hohe Druck öffnet den Anzünder 9 und es treten heiße Gase und Partikel aus dem Anzünder aus. Diese heißen Gase und Partikel treffen auf den Mantel des Sprengdrahtes 2. Dieser schmilzt bzw. wird durchschlagen und es kann sich dessen pyrotechnische Seele entzünden. Beim Abbrand dieser Ladung entstehen wiederum hohe Drücke und Temperaturen, die sich aufgrund der Anordnung des Sprengdrahtes 2 auf der Berstmembran 1 direkt auf deren mechanische Festigkeit auswirken. Die Einwirkung der hohen Drücke und Temperaturen schwächen die Berstmembran 1 derart, daß sie dem Druck des Gases in der Druckgasflasche 6 nicht mehr standhalten kann. Die Berstmembran 1 birst und Gas 5 strömt aus dem Druckgasbehälter 6 in die Anzündkammer 7. Das brennbare Gas 5 wird durch die in der Anzündkammer 7 noch vorhandenen heißen Gase und Partikel entzündet. Das Gasgemisch brennt ab und die Verbrennungsgase strömen nach dem Öffnen der Verdammung 8 des Anzündrohres 11 über die Austrittsöffnungen 12 zum Verbraucher (Gassack) ab. Figur 6 zeigt eine mit inertem Gas gefüllte Druckgasflasche in einem Gasgenerator mit erfind ungsgemäßer Berstmembran. Im Innern des Gasbehälters 6 befindet sich ein inertes Gas 13. Der Gasbehälter 6 ist durch die Berstmembran 1 verschlossen und steht unter Druck. Auf der Berstmembran 1 ist der Sprengdraht 2 angebracht. Dieser ragt in die Anzündkammer 7, welche von einem Anzündrohr 11 ausgebildet wird. In dieser Anzündkammer befindet sich weiterhin ein oder mehrere Treibsätze 14. Im Anzündrohr 11 befindet sich ein Anzündträger 10 auf dem der Anzünder 9 angebracht ist, welcher in die Anzündkammer 7 ragt. Weiterhin sind am Anzündrohr 11 Austrittsöffnungen 12 angebracht. Diese Austrittsöffnungen 12 sind mit einer Verdammung 8 bedeckt.FIG. 5 shows a compressed gas bottle filled with combustible gas in a gas generator with a bursting membrane according to the invention. There is a combustible gas 5 inside the gas container 6. The gas container 6 is closed by the bursting membrane 1 and is under pressure. The explosive wire 2 is attached to the bursting membrane 1. This protrudes into the ignition chamber 7, which is formed by an ignition tube 11. In the ignition tube 11 there is an ignition carrier 10 on which the igniter 9 is attached, which projects into the ignition chamber 7. Furthermore, outlet openings 12 are provided on the ignition tube 11. These outlet openings 12 are covered with a dam 8. If the igniter 9 is now activated, for example by a surge of current, a bridge wire melts in the igniter 9, which in turn ignites one or more pyrotechnic charges in the igniter itself. The high pressure which arises when the pyrotechnic charges burn off opens the igniter 9 and hot gases and particles emerge from the igniter. These hot gases and particles hit the sheath of the explosive wire 2. This melts or is broken through and its pyrotechnic soul can ignite. When this charge burns up, high pressures and temperatures are generated which, due to the arrangement of the explosive wire 2 on the bursting membrane 1, have a direct effect on its mechanical strength. The action of the high pressures and temperatures weaken the bursting membrane 1 in such a way that it can no longer withstand the pressure of the gas in the compressed gas bottle 6. The bursting membrane 1 bursts and gas 5 flows from the compressed gas container 6 into the ignition chamber 7. The combustible gas 5 is ignited by the hot gases and particles still present in the ignition chamber 7. The gas mixture burns and the combustion gases flow to the consumer (gas bag) via the outlet openings 12 after the dam 8 of the ignition tube 11 has been opened. FIG. 6 shows a compressed gas bottle filled with inert gas in a gas generator with a bursting membrane according to the invention. An inert gas 13 is located inside the gas container 6. The gas container 6 is closed by the bursting membrane 1 and is under pressure. The explosive wire 2 is attached to the bursting membrane 1. This protrudes into the ignition chamber 7, which is formed by an ignition tube 11. In this ignition chamber there is also one or more propellant charges 14. In the ignition tube 11 there is an ignition carrier 10 on which the igniter 9 is attached, which projects into the ignition chamber 7. Furthermore, outlet openings 12 are provided on the ignition tube 11. These outlet openings 12 are covered with a dam 8.

Wird nun der Anzünder 9 z.B. durch einen Stromstoß aktiviert, so schmilzt im Anzünder 9 ein sogenannter Brückendraht, der wiederum eine oder mehrere pyrotechnische Ladungen im Anzünder selbst entzündet. Der beim Abbrand der pyrotechnischen Ladungen entstehende hohe Druck öffnet den Anzünder 9 und es treten heiße Gase und Partikel aus dem Anzünder aus. Diese heißen ~ase und Partikel treffen auf den Mantel des Sprengdrahtes 2. Dieser schmilzt bzw. wird durchschlagen und es kann sich dessen pyrotechnisch--* Seele entzünden. Beim Abbrand dieser Ladung entstehen wiederum hohe Drücke und Temperaturen, die sich aufgrund der Anordnung des Sprengdrahtes 2 auf der Berstmembran 1 direkt auf deren mechanische Festigkeit auswirken. Die Einwirkung der hohen Drücke und Temperaturen schwächen die Berstmembran 1 derart, daß sie dem Druck des Gases in der Druckgasflasche 6 nicht mehr standhalten kann. Die Berstmembran 1 birst und Gas 13 strömt aus dem Druckgasbehälter 6 in die Anzündkammer 7, wo gleichzeitig mit dem Sprengdraht 2 auch der Treibsatz 14 gezündet wurde. Das beim Abbrand des Treibsatzes 14 entstehende heiße Gas mischt sich mit dem Kaltgas aus der Druckgasflasche 6 in der Anzündkammer 7. Das Mischgas strömt nach dem Öffnen der Verdammung 8 des Anzünderohres 11 über die Austrittsöffnungen 12 nach außen. Eine weitere nicht abgebildete Variante ergibt sich auch darin, daß der vorzugsweise metallische Mantel 3 des Sprengdrahtes 2 bzw. Hülle 3 das Sprengkissens 18 mit einer elektrischen Energiequelle verbunden wird. In diesem Fall kann die Seele 4 des Sprengdrahtes 2 bzw. die Füllung 4 des Sprengkissens 18 auch unabhängig vom Anzünder 9 z.B. durch einen Stromfluß gezündet werden der durch eine Erwärmung der Umhüllung 3 oder durch Funkenerzeugung im Innern der Umhüllung 3 den Sprengstoff 4 an der Berstmembran 1 zündet. If the igniter 9 is now activated, for example by a surge of current, a so-called bridge wire melts in the igniter 9, which in turn ignites one or more pyrotechnic charges in the igniter itself. The high pressure which arises when the pyrotechnic charges burn off opens the igniter 9 and hot gases and particles emerge from the igniter. These hot particles and particles hit the sheath of the explosive wire 2. This melts or is broken through and its pyrotechnic - * soul can ignite. When this charge burns up, high pressures and temperatures are generated which, due to the arrangement of the explosive wire 2 on the bursting membrane 1, have a direct effect on its mechanical strength. The action of the high pressures and temperatures weaken the bursting membrane 1 in such a way that it can no longer withstand the pressure of the gas in the compressed gas bottle 6. The bursting membrane 1 bursts and gas 13 flows from the compressed gas container 6 into the ignition chamber 7, where at the same time the propellant charge 14 was ignited with the explosive wire 2. The hot gas formed when the propellant charge 14 burns up mixes with the cold gas from the compressed gas bottle 6 in the ignition chamber 7. The mixed gas flows outward through the outlet openings 12 after the dam 8 of the ignition tube 11 has been opened. Another variant, not shown, also results from the fact that the preferably metallic sheath 3 of the explosive wire 2 or sheath 3 of the explosive cushion 18 is connected to an electrical energy source. In this case, the core 4 of the explosive wire 2 or the filling 4 of the explosive cushion 18 can also be ignited independently of the igniter 9, for example by a current flow, by heating the casing 3 or by generating sparks inside the casing 3, the explosive 4 on the bursting membrane 1 ignites.

Claims

PATENTANSPRÜCHE PATENT CLAIMS 1. Anordnung zum Öffnen der Berstmembran (1) von Druckgasflaschen (6) in Gasgeneratoren, dadurch gekennzeichnet, daß auf der1. Arrangement for opening the bursting membrane (1) of compressed gas cylinders (6) in gas generators, characterized in that on the Berstmembran (1) oder in der Berstmembran ein pyrotechnischer Sprengsatz (4) angebracht ist.Bursting membrane (1) or in the bursting membrane a pyrotechnic explosive device (4) is attached. 2. Anordnung zum Öffnen der Berstmembran (1) von Druckgasflaschen (6) in Gasgeneratoren nach Patentanspruch 1 , dadurch gekennzeichnet, daß der pyrotechnischer Sprengsatz (4) auf oder in der Berstmembran (1) als Seele (4) eines Sprengdrahtes (2) ausgebildet ist, die von einem Mantel (3) aus Metall oder Kunststoff umgeben ist.2. Arrangement for opening the bursting membrane (1) of pressurized gas bottles (6) in gas generators according to claim 1, characterized in that the pyrotechnic explosive device (4) on or in the bursting membrane (1) as a soul (4) of an explosive wire (2) which is surrounded by a jacket (3) made of metal or plastic. 3. Anordnung zum Öffnen der Berstmembran (1) von Druckgasflaschen3. Arrangement for opening the bursting membrane (1) of compressed gas cylinders (6) in Gasgeneratoren nach Patentanspruch 1 , dadurch gekennzeichnet, daß der pyrotechnischer Sprengsatz auf oder in der Berstmembran (1) als Füllung (4) eines Sprengkissens (18) ausgebildet ist, das von einer Hülle (3) aus Metall oder Kunststoff umgeben ist.(6) in gas generators according to claim 1, characterized in that the pyrotechnic explosive device on or in the bursting membrane (1) is designed as a filling (4) of an explosive cushion (18) which is surrounded by a sheath (3) made of metal or plastic . 4. Anordnung zum Öffnen der Berstmembran (1) von Druckgasflaschen4. Arrangement for opening the bursting membrane (1) of compressed gas cylinders (6) in Gasgeneratoren nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Befestigung zwischen(6) in gas generators according to claim 2 or 3, characterized in that the attachment between Sprengdraht/Sprengkissen (2/18) und Berstmembran (1) durch Kleben (15) erzielt wird. Detonating wire / explosive cushion (2/18) and bursting membrane (1) is achieved by gluing (15). 5. Anordnung zum Öffnen der Berstmembran (1) von Druckgasflaschen5. Arrangement for opening the bursting membrane (1) of compressed gas cylinders (6) in Gasgeneratoren nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Befestigung zwischen(6) in gas generators according to claim 2 or 3, characterized in that the attachment between Sprengdraht/Sprengkissen (2/18) und Berstmembran (1) durch Einpressen des Sprengdrahtes/Sprengkissens (2/18) in eine Nut (16) auf der Berstmembran (1) erzielt wird.Detonating wire / detonating cushion (2/18) and bursting membrane (1) is achieved by pressing the detonating wire / detonating cushion (2/18) into a groove (16) on the bursting membrane (1). 6. Anordnung zum Öffnen der Berstmembran (1) von Druckgasflaschen6. Arrangement for opening the bursting membrane (1) of compressed gas cylinders (6) in Gasgeneratoren nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß der Sprengdraht/Sprengkissen (2/18) durch eine Halterung (17) an der Berstmembran (1) befestigt wird.(6) in gas generators according to claim 2 or 3, characterized in that the explosive wire / explosive cushion (2/18) is fastened to the bursting membrane (1) by a holder (17). 7. Anordnung zum Öffnen der Berstmembran (1) von Druckgasflaschen7. Arrangement for opening the bursting membrane (1) of compressed gas cylinders (6) in Gasgeneratoren nach einem der vorangegangenen Ansprüche mit einem pyrotechnischen Anzünder (9), dadurch gekennzeichnet, daß die Zündenergie zur Auslösung der pyrotechnische Seele/Füllung (4) des Sprengdrahtes/Sprengkissens (2/18) durch die Ummantelung/Hülle (3) übertragen wird, die aufgrund hoher Temperaturen oder Partikel, die durch den Anzünder (9) beim Anzündvorgang entstehen, schmilzt, zerstört wird oder wärmeleitend ist.(6) in gas generators according to one of the preceding claims with a pyrotechnic igniter (9), characterized in that the ignition energy for triggering the pyrotechnic soul / filling (4) of the explosive wire / explosive cushion (2/18) through the sheath / casing (3 ) is transmitted, which melts, is destroyed or is thermally conductive due to high temperatures or particles that arise from the igniter (9) during the ignition process. 8. Anordnung zum Öffnen der Berstmembran (1) von Druckgasflaschen8. Arrangement for opening the bursting membrane (1) of compressed gas cylinders (6) in Gasgeneratoren nach einem der Ansprüche 1-6, dadurch gekennzeichnet, daß die Zündenergie zur Auslösung der pyrotechnische Seele/Füllung (4) des Sprengdrahtes/Sprengkissens (2/18) durch die elektrisch leitfähige Ummantelung/Hülle (3) mittels Stromfluß oder elektrische Entladung zugeführt wird.(6) in gas generators according to one of claims 1-6, characterized in that the ignition energy for triggering the pyrotechnic soul / filling (4) of the explosive wire / explosive cushion (2/18) through the electrically conductive sheath / casing (3) by means of current flow or electrical discharge is supplied. 9. Anordnung zum Öffnen der Berstmembran (1) von Druckgasflaschen (6) in Gasgeneratoren, welche ein brennbares Gas (5) beinhalten, nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die Energie, die beim Abbrennen des Sprengdrahtes/Sprengkissens (2/18) auf oder in der Berstmembran (1) frei wird, zur Entzündung des brennbaren Gases (5) genutzt wird. 9. Arrangement for opening the bursting membrane (1) of pressurized gas bottles (6) in gas generators which contain a combustible gas (5) according to one of the preceding claims, characterized in that the energy required when the explosive wire / explosive cushion (2 / 18) is released on or in the bursting membrane (1), is used to ignite the combustible gas (5). 10. Anordnung zum Öffnen der Berstmembran (1) von Druckgasflaschen (6) in Gasgeneratoren, welche ein inertes Gas (13) beinhalten, nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die Energie, die beim Abbrennen des Sprengdrahtes/Sprengkissens (2/18) auf oder in der Berstmembran (1) frei wird, zur Erwärmung des inerten Gases (13) genutzt wird. 10. Arrangement for opening the bursting membrane (1) of pressurized gas bottles (6) in gas generators which contain an inert gas (13) according to one of the preceding claims, characterized in that the energy required when the explosive wire / explosive cushion (2 / 18) is released on or in the bursting membrane (1), is used to heat the inert gas (13).
PCT/EP1996/003392 1995-08-11 1996-08-01 Arrangement for opening the exploding membrane of compressed gas bottles in gas generators Ceased WO1997006988A1 (en)

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DE1995129553 DE19529553A1 (en) 1995-08-11 1995-08-11 Arrangement for opening the bursting membrane of compressed gas cylinders in gas generators
DE19529553.6 1995-08-11

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