EP1328954A1 - Pyrotechnic safety element - Google Patents
Pyrotechnic safety elementInfo
- Publication number
- EP1328954A1 EP1328954A1 EP01988939A EP01988939A EP1328954A1 EP 1328954 A1 EP1328954 A1 EP 1328954A1 EP 01988939 A EP01988939 A EP 01988939A EP 01988939 A EP01988939 A EP 01988939A EP 1328954 A1 EP1328954 A1 EP 1328954A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- element according
- pyrotechnic substance
- weakening
- deflagrating
- 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
Links
- 239000000126 substance Substances 0.000 claims abstract description 53
- 239000004020 conductor Substances 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims abstract description 28
- 230000004913 activation Effects 0.000 claims abstract description 27
- 239000002360 explosive Substances 0.000 claims abstract description 13
- 230000003213 activating effect Effects 0.000 claims abstract description 4
- 230000003313 weakening effect Effects 0.000 claims description 56
- 230000001681 protective effect Effects 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 8
- 230000032683 aging Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000035882 stress Effects 0.000 claims description 5
- 230000006378 damage Effects 0.000 claims description 4
- 239000012634 fragment Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 12
- 238000007789 sealing Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 230000001960 triggered effect Effects 0.000 description 6
- 239000004033 plastic Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000003380 propellant Substances 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- TZRXHJWUDPFEEY-UHFFFAOYSA-N Pentaerythritol Tetranitrate Chemical compound [O-][N+](=O)OCC(CO[N+]([O-])=O)(CO[N+]([O-])=O)CO[N+]([O-])=O TZRXHJWUDPFEEY-UHFFFAOYSA-N 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000003832 thermite Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H39/00—Switching devices actuated by an explosion produced within the device and initiated by an electric current
- H01H39/006—Opening by severing a conductor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H39/00—Switching devices actuated by an explosion produced within the device and initiated by an electric current
- H01H2039/008—Switching devices actuated by an explosion produced within the device and initiated by an electric current using the switch for a battery cutoff
Definitions
- the invention relates to a pyrotechnic securing element with the features of the preamble of patent claim 1.
- Such fuse elements are used, for example, in motor vehicle technology for the defined and rapid disconnection of high-voltage electrical circuits in an emergency. There is a requirement for such a safety element that its triggering and interruption function must be reliably guaranteed even after up to 20 years without maintenance. Furthermore, such a fuse element must not pose any additional hazard potential due to hot gas, particles, throwing pieces or high voltages induced in the switched-off circuit.
- One possible area of application in automotive engineering is the defined irreversible removal of wiring from the car battery shortly after an accident in order to avoid sources of ignition from sparks and plasma, which may arise if, for example, cable insulation has been chafed by the body panel penetrating during the accident or loose cable ends against each other or press against sheet metal parts and rub on. If gasoline leaks at the same time in an accident, such ignition sources can ignite ignitable gasoline-air mixtures that collect, for example, under the hood.
- Another area of application is the electrical disconnection of an assembly from the vehicle electrical system in the event of a short circuit in the assembly in question, for example in an electric auxiliary heater.
- pyrotechnic fuses which are actively controlled for tripping.
- DE-AS 2 103 565 describes a circuit breaker which comprises a metallic housing which is connected at two spaced-apart connection areas to one end of a conductor to be protected.
- a pyrotechnic element is provided in the housing and is formed by an explosive charge.
- the explosive charge is through an electric Detonator activatable, which comprises an ignition element that is evaporated by a feed current.
- the housing is filled with an insulating liquid.
- the axially extended housing has a circumferential groove along which the housing tears open when the explosive charge is detonated.
- the housing is broken up into two electrically separate parts, so that the circuit in question is separated.
- the plasma generated when a circuit with a very high current intensity is disconnected is extinguished in this circuit breaker by the atomized insulating liquid.
- it can be triggered, for example, by the signal from a shock sensor.
- Such high-current fuses have the disadvantage of a switch-off time fluctuating within a wide range after the nominal current strength of the fuse has been reached.
- a cable secured with it can therefore only be used to a very small extent with regard to its current carrying capacity, e.g. 30% of capacity is used, as otherwise a cable fire could otherwise occur in the event of an overload.
- an emergency switch for electrical circuits which enables both a self-triggering and a triggerable triggering.
- an electrical conductor which has a pyrotechnic core.
- the pyrotechnic core can be ignited on the one hand by heating the electrical conductor when an admissible current (nominal current) is exceeded.
- a controllable ignition device for example in the form of a glow wire.
- DE 197 49 133 AI only represents the principle of such a device, but does not give any indication of possible designs that can be carried out in an advantageous manner.
- a fuse is known from US Pat. No. 3,958,206, in which the current to be protected is led over a fuse element filled with an exothermically reactive material, the wall of the fuse element bursting due to the activation of the exothermically reactive material and interrupting the current.
- an exothermic reactive material e.g. PETN used, i.e. a detonative material, so that such security is subject to strict approval regulations.
- the exothermic reactive material can be activated by the heat loss of the current to be protected itself or by an active ignition device.
- tearing open the fuse element housing would result in a slower burning material, e.g. a so-called propellant powder, undefined and dirty.
- propellant powder undefined and dirty.
- US Pat. No. 3,958,206 discloses a fuse with a fuse element in the form of, for example, a flat conductor which is coated with an aluminum and a palladium layer arranged above it.
- the aluminum and palladium act as exothermic reactive materials, whereby the activation of the exothermic process can take place through the heat loss of the current to be protected or by means of an activation device.
- the invention has for its object to provide a pyrotechnic fuse element which can be equipped with both a self-timer function and a controllable release function and which can be produced in a simple and inexpensive manner.
- the invention solves this problem with the features of claim 1.
- the housing of the securing element can have a circumferential weakening of its outer wall. This can have two different functions, which, depending on the structural design of the securing element and on the dimensioning and design of the pyrotechnic substance, can possibly both be performed simultaneously:
- the weakening can serve, in a manner known per se, to cause the housing to be broken open to achieve a current interruption of the current flowing through the housing in a defined manner along the weakening.
- the weakening can be designed in such a way that the current flowing through the fuse in the area of the weakening, which has an increased resistance, generates such a large power loss that, if a predetermined current is exceeded, the deflagrating material is specifically ignited at this point, without having to heat the securing element as a whole. The heating will thus also take place quickly, as desired.
- a corresponding embodiment can comprise a housing made of an essentially hollow cylindrical or pot-shaped part, the two end faces of which
- Openings or one of their end openings are closed by means of an essentially plug-like or cap-like closure element.
- the pyrotechnic substance is ignited (self-ignition or by means of an ignition device)
- the pressure in the area of the weakening of the outer wall is so high that this weakened part of the outer wall of the housing - even when the internal pressure increases relatively slowly compared to a detonative implementation - Tears open, aerodynamically further and completely torn open by the inflowing gas and the current path is interrupted.
- At least one closure element is so positively and / or positively and electrically connected to the hollow cylindrical or pot-shaped part that the mechanical connection between the closure element and the hollow cylindrical or pot-shaped part can be released by activating the deflagrating pyrotechnic substance and that Both parts are separable and the electrical connection between the connection area provided on the hollow cylindrical or pot-shaped part and the connection area provided on the closure element can be separated.
- the housing in particular the hollow cylindrical or pot-shaped part, can have a circumferential weakening.
- This can then be designed such that a predetermined activation temperature for the deflagrating pyrotechnic substance can be generated by the current flow over the housing in predetermined areas at a predetermined nominal current.
- the circumferential groove can also serve as additional security in this case if the mechanical connection of the relevant housing parts cannot be separated, for example due to a production error.
- the weakening can again serve to ensure that the part in question simply tears open due to the excess pressure generated when the breaking stress of the material of the housing is exceeded.
- the weakening can be designed such that higher temperatures or defined temperatures occur in certain areas, preferably at corners or edges of the weakening, which cause the pyrotechnic material to self-ignite be used and / or the formation of particles is reliably prevented when triggered.
- the circumferential weakening is preferably designed such that an area is formed between two cross-sectional jumps (or very steep flanks) that has a significantly smaller wall thickness than the rest of the housing, in particular in the areas adjacent to the cross-sectional jumps.
- the wall thickness is preferably constant in this area.
- the axial extent of the circumferential weakening is preferably 1 to 5 mm.
- the thickness of the area is
- the housing is securely torn and torn in the entire area of the circumferential weakening and, if desired, the circumferential weakening can be dimensioned such that the deflagrating material self-ignites is achievable.
- the area within the cross-sectional jumps can have structures on the inside and / or outside that produce notch effects and burst or disassemble support the area into a multitude of small parts.
- a thread can be provided on the inside. This is a very inexpensive way to manufacture such a structure.
- the deflagrating pyrotechnic substance provided in the housing can be penetrated by an electrical conductor, which is connected at both ends to one of the connection areas, the
- Conductor is designed so that the pyrotechnic substance is activated by its heating at a predetermined nominal current.
- the resistance of the conductor is preferably such that when the rated current flows, which in this case is divided between the housing and the conductor, at least the conductor reaches the ignition temperature for the pyrotechnic substance.
- the activation device for the controlled ignition of the pyrotechnic substance can likewise comprise an electrical conductor which can be acted upon in a controlled manner. This can be led out of the housing with one or both ends insulated. If only one end is led out, the other end of the conductor becomes one Connection area of the housing connected. The ignition current for the conductor is then branched off from the total current that flows through the fuse element.
- the deflagrating pyrotechnic substance comprises a first component which has a higher activation temperature and a second component which has a lower activation temperature. At least the first component can have an aging resistance sufficient for the desired functionality period and can be dimensioned and designed such that when the first component is activated, this alone is sufficient to interrupt the electrical connection between the connection areas.
- a first component with a higher (generally very high) ignition temperature and with sufficient resistance to aging at the given high ambient temperature is used, and a further component which can be activated at the desired (usually substantially lower) ignition temperature.
- a further component which can be activated at the desired (usually substantially lower) ignition temperature is used, and a further component which can be activated at the desired (usually substantially lower) ignition temperature.
- an aging process is less important, since the first component is still ignited by the second component even when larger parts of the second component are inactive as a result of the aging process.
- Figure 1 is a schematic representation of a first embodiment of a pyrotechnic security element with autoignition function.
- Figure 2 is a schematic representation of a second embodiment of a pyrotechnic security element with autoignition function.
- FIG. 3 shows a schematic illustration of a third embodiment of a pyrotechnic safety element with a triggerable ignition function
- FIG. 4 shows a schematic representation of a fourth embodiment of a pyrotechnic security element with a controllable ignition function
- FIG. 5 shows the embodiment in FIG. 1 with a protective device against parts of the securing element that fly outward after it has been torn open;
- FIG. 6 longitudinal sections of two embodiments (Fig. 6a and Fig. 6b) of
- Fig. 9 is a representation in longitudinal section of another Austii gform one
- Fuse element with a protective housing in which the housing parts separated after the fuse element has been triggered can be displaced axially.
- Fig. 1 shows schematically the basic structure of a first embodiment of a pyrotechnic security element.
- This consists of a housing 1, preferably in the form of a metal tube, which is simply squeezed together in its end regions 2.
- Cross bores can be provided in the end regions 2 in order to be able to screw the securing element there onto a busbar or to screw on cable lugs.
- the end regions 2 thus form connection regions for a circuit to be protected or the ends of a conductor to be protected.
- the housing 1 is completely or partially, loosely or pressed with a deflagrating pyrotechnic substance 3, preferably a propellant powder, filled. At least parts of the inner walls of the housing 1 are in thermal contact with the pyrotechnic substance 3.
- the pinch gap in the end regions 2 is sealed by a material 27 against external influences, in particular against penetrating moisture and water vapor.
- the pyrotechnic substance can consist of one or more components.
- a component with a low ignition temperature or low activation energy are used to ignite another (main) component, the combustion gases of which ultimately destroy the housing.
- a substance can therefore be selected for the main component that ignites only at very high temperatures. This is particularly advantageous since such substances generally have a very high resistance to aging. The ignitability of the mixture can therefore be ensured even with long-term and / or relatively high heating of the housing 1.
- FIG. 2 shows an embodiment similar to FIG. 1, with an additional electrical conductor 4, for example a wire or a ribbon core, being provided through the pyrotechnic substance 3.
- the conductor 4 is connected to the end regions 2 of the housing 1.
- the conductor 4 is dimensioned in terms of its resistance so that when the rated current flows via the parallel connection of the current path via the
- the conductor 4 has a temperature sufficient to ignite the substance 3.
- a securing element has a lower inertia with respect to the time delay between a calibration of the nominal current and the activation time of the substance 3.
- the conductor 4 remains at least for a short time as a current path. If the voltage in the circuit to be protected after the housing is destroyed is so high that a very high current flows through the conductor 4, the conductor melts or burns out. If the conductor is made of a heat-resistant material, e.g. Tungsten, selected, or if the voltage in the circuit to be protected is correspondingly low, the conductor remains permanently in the circuit and serves as a current
- the housing 1 bursts in the event of an overload, so that the low-resistance current path that had made the high short-circuit currents destroyed, and a relatively high-frequency current path remains, for example for the further supply of low-energy safety devices such as emergency lighting, radio telephone Etc. 3 shows a further embodiment of a pyrotechnic security element, in which a controllable ignition function is additionally provided.
- a circumferential weakening 5 is provided in the outer wall of the housing 1. This makes it possible to control the type of destruction of the housing 1 and, at the same time, its self-heating when current is passed. The smaller the wall thickness of the weakening 5, the higher the contact resistance in this area. Thus, the housing 1 will also heat up more in this area than in areas with a thicker outer wall.
- the weakening 5 enables the housing to be torn open in the area of the weakening 5.
- FIG. 3 also shows a controllable activation device 23 that realizes the controllable ignition function. It consists of a conductor 23 a, which can for example be designed as a filament and has power connections 16 and 19. The two power connections are led to the outside via the insulating bushes 17 and 18.
- the insulating bushes 17 and 18 are also designed to be self-sealing, thus preventing the pressure loss from self-locking when the pressure builds up in the housing 1 after the pyrotechnic substance 3 is ignited.
- Fig. 4 shows an embodiment similar to Fig. 3. Shown here is a different shape of the conductor 23 a.
- the conductor 23 a can of course also be of any shape, for example also as single or multiple coiled loops or the like.
- FIG. 4 additionally shows a structure in the inner wall of the housing 1, the task of which is to enlarge the contact area of the housing wall with the pyrotechnic substance 4 and thus to further increase the probability of ignition.
- FIG. 5 shows the embodiment of a securing element according to FIG. 1, a protective housing 7 being additionally provided schematically.
- the protective housing 7 protects the surroundings of the securing element against splinters flying outwards or gas or gas / particle mixture released to the outside.
- the protective housing 7 can of course be dispensed with if the fuse element is installed in a superordinate housing, for example in the housing of a fuse box or central electrical system.
- the protective housing 7 can be produced from a hard but impact-resistant and current-isolating material or from a soft plastic which, however, acts plastically for fast small particles, into which these particles then dig and are “disposed of”.
- FIGS. 6a and 6b two further embodiments which are suitable for use cases in which at least one cable connection can move axially.
- These embodiments have a housing 1 which is formed in two parts and consists of parts 9 and 40.
- the housing parts 9, 40 each have a connection area 2.
- the pyrotechnic substance 3 is arranged in the housing part 40, which is essentially pot-shaped. A weakening of the outer wall (not shown) can in turn be provided in the housing part 40.
- the pyrotechnic substance 3 ignites.
- a clinching 12 occurs which, in addition to connecting the two housing parts, also has the function of a dam for the pyrotechnic Fabric 3 has loosened and both housing parts are pressed apart. The circuit is interrupted.
- a sealing system 11 can be provided for sealing the non-activated state.
- the seal for the activated state is in any case taken over by a self-sealing sealing lip 14 of the housing part 9, so that the housing parts here are self-sealing.
- Cross bores 8 can be provided in the two end regions or connection regions 2 of the housing parts 9, 40. With these, the securing element to a
- connection areas 2 must be connected to an electrical conductor in such a way that the housing parts 9, 40 can be pressed apart and, preferably, the housing parts are touched again after one
- FIG. 6a shows a spring element 24 which serves to pretension the housing parts. This means that less pyrotechnic material is required. Lower gas pressure is required to trigger the safety element. As a result, a lower force of the divergence of the two housing parts 9, 40 is achieved when the securing element is triggered.
- FIG. 6b again shows an electrical conductor 4 which is connected to the connection area 2 of the housing part 40 and the housing part 9. He already met the in
- FIG. 7 shows sections from longitudinal sections through the outer wall of the housing 1 of any embodiment in the area of the weakenings 5.
- a weakening triangular in the longitudinal section according to FIG. 7a or several triangular weakenings according to FIGS. 7c and 7d result in moderate heating when current is passed.
- the housing 1 tears open very cleanly and completely at the point with the largest cross-sectional jump.
- the multiple weakenings according to FIGS. 7c and 7d serve to influence the switch-off characteristic of the fuse element:
- the decisive factors here are the heat capacity of the less weakened middle part, as well as the number, the distance, the
- FIG. 8 shows a perspective, broken-away view of an embodiment of a securing element, in which the housing 1 essentially comprises a hollow cylindrical part 1b.
- the housing 1 essentially comprises a hollow cylindrical part 1b.
- stopper-like closure elements 1 a are arranged which tightly close the front openings of the hollow cylindrical part 1 b.
- the parts la can also isolate from the material, for example plastic.
- the front ends of the hollow cylindrical part 1b are bent over in such a way that the parts la are held in a form-fitting manner in the hollow cylindrical part.
- projections 1 c can be provided in the inner wall of the hollow cylindrical part 1 b in order to fix the parts 1 a in a form-fitting manner.
- the inwardly directed end faces of the parts la can be designed to be self-sealing, for example have a sealing lip which extends inwards from the respective end face and which is introduced under the pressure of the pyrotechnic material 3 which is introduced between the parts la in the housing 1 is against the inner wall of part lb.
- FIG. 8 also shows a conductor 23, which enables triggerable ignition of the fuse element in the manner described above.
- FIG. 9 shows a representation in longitudinal section of a further embodiment of a securing element with a protective housing, in which the housing parts separated after the securing element has been triggered can be displaced axially.
- the housing 1 of the actual securing element which can consist of a conductive material, for example graphite, coal, a conductive plastic or metal or of materials coated with metals such as coal, graphite or plastic, is essentially cylindrical and closed at one end. Deflagrating pyrotechnic substance 3 is provided in a central bore 60.
- a receiving opening 62 for a closure (not shown) which closes the housing 1 in a pressure-tight manner.
- An activation device (not shown in more detail) can also be received in the receiving opening in order to activate the deflagrating substance in a controlled manner.
- a thread (not shown) can be screwed into the bore 60 and extends in particular in the area of the circumferential weakening 5 in the wall of the housing 1. The thread represents a structure with a corresponding notch effect, which means that when the deflagrating material is activated, the wall in the area of the circumferential weakening tears open and breaks into small fragments.
- a corresponding structure for producing notch effects can of course also be provided in the outer wall of the circumferential weakening, for example by erosive processing of the surface.
- Such an irregular structure as already described in connection with FIG. 4, considerably increases the probability of ignition when ignited by self-heating.
- housings 1 By using highly conductive and brittle materials for the housing, or at least for the circumferential weakening, housings 1 can be produced which tear open even at low internal pressures, the material of the circumferential weakening broken out being broken down into a large number of small pieces. Due to the relatively high specific resistance of materials such as graphite or carbon, ignitions of the deflagrating substance can also be achieved with relatively low currents flowing through the housing. In this case, the outer surface of the housing that is not used for the web can in particular be covered with a thick copper layer and thus further guarantee a very low overall resistance of the securing element.
- the housing 1 is encompassed by a protective housing 7, which is used to catch the fragments of the tearing circumferential
- the housing 1 has circumferential grooves 64, 66 which protrude through recesses in the end faces of the protective housing 7. The adjacent to the outer sides of the end walls Shoulders of the grooves 64, 66 serve to axially fix the housing 1 in the protective housing 7 and, in the initial state, rest on the end walls.
- the protective housing can consist of plastic, in particular polycarbonate, and can be formed in one piece or in several parts.
- the protective housing 7, as shown in FIG. 9, can be surrounded by a tube 68 which is bent or flanged around the end faces of the protective housing and which can consist, for example, of metal.
- a shrink tube 70 or a comparable insulation can also be applied over the metal tube.
- the circumferential weakening is torn open over the entire circumference by the gas pressure generated.
- the axial mobility of the resulting parts of the housing 1 on both sides of the circumferential weakening 5 also creates tensile stresses which promote the tearing open of the circumferential weakening 5.
- the two separated parts of the housing 1 in the protective housing 7 move axially outward at most until the inner sides of the end walls of the protective housing 7 abut the inner stop shoulders of the grooves 64, 66.
- a structure 72 is provided on the inner wall of the protective housing 7 in the area of the circumferential weakening for catching the parts of the torn circumferential weakening 5.
- the structure 72 can be embodied integrated with the protective housing 7 or can be realized by additional material and / or an additional part. Circumferential keyways are particularly suitable because the radially outwardly thrown parts of the torn circumferential weakening wedge in the radially outwardly tapering grooves and thus can no longer cause unwanted contact after the fuse has been activated.
- the embodiment according to FIG. 9 can also have a circumferential weakening in
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10052545A DE10052545A1 (en) | 2000-10-23 | 2000-10-23 | Pyrotechnic security element |
DE10052545 | 2000-10-23 | ||
PCT/DE2001/004016 WO2002035568A1 (en) | 2000-10-23 | 2001-10-23 | Pyrotechnic safety element |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1328954A1 true EP1328954A1 (en) | 2003-07-23 |
EP1328954B1 EP1328954B1 (en) | 2006-05-31 |
Family
ID=7660781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01988939A Expired - Lifetime EP1328954B1 (en) | 2000-10-23 | 2001-10-23 | Pyrotechnic safety element |
Country Status (6)
Country | Link |
---|---|
US (1) | US6954132B2 (en) |
EP (1) | EP1328954B1 (en) |
JP (1) | JP2004512645A (en) |
AU (1) | AU2002220501A1 (en) |
DE (2) | DE10052545A1 (en) |
WO (1) | WO2002035568A1 (en) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060068179A1 (en) * | 2000-05-02 | 2006-03-30 | Weihs Timothy P | Fuse applications of reactive composite structures |
DE10139360C2 (en) * | 2001-08-19 | 2003-11-13 | Peter Lell | Pyrosicherung without external effect in foreign and self-triggering |
DE10205369B4 (en) * | 2002-02-10 | 2004-03-25 | Lell, Peter, Dr.-Ing. | Electrical fuse, in particular pyrotechnic fuse for interrupting high currents in electrical circuits |
DE10209625A1 (en) * | 2002-03-05 | 2003-10-02 | Mbb Airbag Systems Gmbh | Pyrotechnic cutout for switching off a load e.g. in motor vehicle, has an ignition circuit, an operating current insulated from connection pieces and thermal separation between the connection pieces. |
WO2006027251A1 (en) * | 2004-09-09 | 2006-03-16 | Lisa Dräxlmaier GmbH | Load shedder |
EP1710871B1 (en) * | 2005-04-08 | 2007-09-05 | Auto Kabel Managementgesellschaft mbH | Current separator for the electrical cables in a car |
JP2009503768A (en) * | 2005-07-22 | 2009-01-29 | リッテルフューズ,インコーポレイティド | Electrical device with integral fused conductor |
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DE102008055904B4 (en) * | 2008-11-05 | 2018-03-22 | Auto-Kabel Management Gmbh | Plug connection for an occupant protection device |
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2000
- 2000-10-23 DE DE10052545A patent/DE10052545A1/en not_active Withdrawn
-
2001
- 2001-10-23 AU AU2002220501A patent/AU2002220501A1/en not_active Abandoned
- 2001-10-23 WO PCT/DE2001/004016 patent/WO2002035568A1/en active IP Right Grant
- 2001-10-23 EP EP01988939A patent/EP1328954B1/en not_active Expired - Lifetime
- 2001-10-23 DE DE50109978T patent/DE50109978D1/en not_active Expired - Lifetime
- 2001-10-23 JP JP2002538456A patent/JP2004512645A/en not_active Withdrawn
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2003
- 2003-04-23 US US10/421,121 patent/US6954132B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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See references of WO0235568A1 * |
Also Published As
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DE50109978D1 (en) | 2006-07-06 |
US6954132B2 (en) | 2005-10-11 |
US20040113745A1 (en) | 2004-06-17 |
AU2002220501A1 (en) | 2002-05-06 |
JP2004512645A (en) | 2004-04-22 |
WO2002035568A1 (en) | 2002-05-02 |
EP1328954B1 (en) | 2006-05-31 |
DE10052545A1 (en) | 2002-05-02 |
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