EP0567959A2 - Amorce électrique à espace de décharge destiné - Google Patents

Amorce électrique à espace de décharge destiné Download PDF

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Publication number
EP0567959A2
EP0567959A2 EP93106695A EP93106695A EP0567959A2 EP 0567959 A2 EP0567959 A2 EP 0567959A2 EP 93106695 A EP93106695 A EP 93106695A EP 93106695 A EP93106695 A EP 93106695A EP 0567959 A2 EP0567959 A2 EP 0567959A2
Authority
EP
European Patent Office
Prior art keywords
housing
ignition
metal layer
distance
carrier body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93106695A
Other languages
German (de)
English (en)
Other versions
EP0567959A3 (fr
Inventor
Hans-Peter Cornelius
Heinz Kern
Gerhard Kordel
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.)
Dynamit Nobel GmbH Explosivstoff und Systemtechnik
Original Assignee
Dynamit Nobel AG
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 Dynamit Nobel AG filed Critical Dynamit Nobel AG
Publication of EP0567959A2 publication Critical patent/EP0567959A2/fr
Publication of EP0567959A3 publication Critical patent/EP0567959A3/xx
Withdrawn legal-status Critical Current

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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
    • F42B3/10—Initiators therefor
    • F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
    • F42B3/182—Safety initiators resistant to premature firing by static electricity or stray currents having shunting means

Definitions

  • the invention relates to an electrical ignition element with a target discharge path to protect against ignition as a result of a discharge of electrostatic charge, with an electrically conductive housing for accommodating an ignition charge, an electrical ignition bridge which is in contact with the ignition charge and two which are held in the housing and electrically insulated from it Connection elements, each with an ignition bridge contacting end for the ignition bridge and a connection end for applying an ignition voltage to the connection elements.
  • the ignition element has two connection elements in the form of two connection (pole) pins which extend through a carrier body made of electrically insulating material.
  • the insulation carrier body is held in the ignition element housing.
  • a metal layer is applied to the top of the insulation body in contact with the primer.
  • the metal layer is electrically connected to the connection elements.
  • the metal layer is divided into two metal layer regions which are electrically connected to one another by a narrow web section of the metal layer.
  • the metal coating is electrically insulated from the ignition element housing via an annular gap.
  • the annular gap is separated from the primer by a protective body or a protective film made of electrically insulating material.
  • the annular gap width is selected such that the electrostatic discharge is inclusive from a certain electrostatic charge on the connection elements Metal coating discharges against the housing or vice versa by sparking in the annular gap.
  • the annular gap thus represents the target discharge path.
  • the protective body or the protective film is provided to protect the primer from the discharge sparks. In practice, it has been shown that in the known ignition element, in all cases, as expected, the sparkover does not occur exclusively below the cover (cover film or protective body), that is to say via the generated discharge path to the housing. Rather, it was found that the sparkover occurs over the insulating cover to the housing, thereby triggering an unwanted ignition.
  • Another electrical ignition element is known from US Pat. No. 3,333,538, in which the two connection elements are connected to one another via an electrically insulating film.
  • the insulation film has a plurality of evenly distributed raised hexagon regions made of electrically conductive material and arranged at the same distance from one another, each connecting element being electrically connected to one of these hexagon regions.
  • the sparkover should take place between the individual electrically conductive hexagon areas.
  • the external hexagon areas are electrically connected to the inner surface of the housing, which is problematic in terms of production technology, so that there is a risk that the electrical connection is not present at all locations. This results in different electrical behaviors, which negatively affects the quality of the ignition elements.
  • the invention has for its object to an electrical ignition element with target discharge path create that is simply constructed and manufacturable and in which electrostatic potential differences can still discharge safely without initiating the primer when discharging.
  • the invention proposes an electrical ignition element of the type mentioned, in which at least one of the two connection elements has a discharge section which is arranged at a distance from the igniter and in which the dielectric strength between the connection element and the housing is less than in the remaining area of the two connection elements, and in which the distance between the discharge section and the housing or areas electrically connected to the housing forms the target discharge distance.
  • connection element has a discharge section in which the distance between the connection element in question and the housing is so small that a flashover can occur for discharging electrostatic charges.
  • both connection elements are each provided with such a discharge section.
  • the discharge section or sections are arranged at a sufficient distance from the ignition charge so that the ignition charge is not initiated by the spark.
  • the construction of the ignition element according to the invention is such that the smallest distance between the connection elements on the one hand and the housing on the other hand exists in the area of the discharge section or sections.
  • the dielectric strength between the ignition bridge and connection elements on the one hand and the housing on the other hand is in the region of the discharge section or sections least (if the same dielectric is assumed between the igniter element - ignition bridge and connection elements - and housing).
  • the path between the (each) discharge section and the housing or the (each) discharge section and regions of the ignition element which are electrically connected to the housing forms the target discharge path over which the sparkover occurs.
  • the electrical ignition element according to the invention is quite simple in its manufacture and construction, since the desired discharge path results solely from the arrangement of the connection elements with the discharge section or sections.
  • the target discharge path is formed outside the critical interface between the ignition bridge and the primer, which is why additional shielding or shielding of the target discharge path from the primer can be dispensed with.
  • the discharge section or the discharge sections are advantageously arranged on the underside of a carrier body made of electrically insulating material facing away from the primer, through which the two connection elements extend and which is held in the housing.
  • the carrier body made of insulation material which is provided as a holding element for the two connection elements in each electrical ignition element, is thus arranged between the ignition charge and the target discharge path.
  • a part that is necessarily provided for electrical ignition elements namely the insulator carrier body, is used.
  • the discharge section or sections are in the form of thin metal layer regions formed, which are applied to the underside of the insulator support body and which end at a small (ring) distance from the generally cylindrical housing.
  • the metal layer regions on the underside of the insulator carrier body facing away from the primer are advantageously formed by cutting out narrow gaps from a metal coating on the underside of the carrier body. This creates individual mechanically and electrically separated metal layer areas.
  • the ring spacing of the metal layer regions from the housing is also created by cutting out circular-arc-shaped sections from the metal coating.
  • a metal coating on the top of the insulator carrier body facing the primer.
  • the metal coating is electrically connected to both connection elements.
  • the metal coating ends at a sufficiently large distance from the housing.
  • edge incisions in the metal coating in the area between the connection elements two metal layer subregions are created, each of which is electrically connected to a connection element.
  • the electrical connection between these two sub-areas takes place via a narrow web section of the metal coating, which represents the ignition bridge.
  • Such a design of the ignition bridge is known per se from DE 34 15 625 A1.
  • the metal coating is arranged on the underside of the insulator carrier body in a cavity formed there.
  • This cavity is delimited by the insulator carrier body, the housing and a closure element arranged at a distance from the carrier body.
  • the metal layer on the underside of the insulator carrier body thus represents part of the inner surface of the cavity.
  • the connection elements extend through the closure element in order to be guided to outside the housing, where their connection ends are located.
  • the ring distance between the housing and the metal coating on the top of the carrier body is at least about 1 1/2 times as large as the distance between the metal layer on the underside of the carrier body facing away from the primer and the housing. So there are two sparkover gaps between the igniter element (ignition bridge with the connection elements) and connected in parallel with the housing.
  • the sparkover gap on the underside of the insulator carrier body has the lower dielectric strength due to the short length, which is determined on the one hand by the size of the distance and on the other hand by the dielectric material which may fill this distance.
  • the distance on the underside of the insulator carrier body thus forms the target discharge path, since discharge sparks are more likely to form over the ring spacing provided there than over the edge section provided on the top.
  • an electrical ignition element 10 is shown in longitudinal section.
  • the ignition element 10 has an electrically conductive housing 12, which consists of a cylindrical metal cap 14 and a cylindrical mounting sleeve body 16 also made of metal.
  • the cap 14 and the mounting body 16 are welded together at 18.
  • An ignition charge 20 is arranged in the cap 14 and has two layers arranged one above the other 22,24 from differently sensitive ignition material.
  • the primer 20 essentially fills the entire elongated cap 14.
  • the mounting body 16 holds a cylindrical carrier body 16 made of an electrically insulating material, for example a ceramic material.
  • the support body holds two electrically conductive connection elements in the form of two metallic connection pins 28.
  • the connection pins extend through the support body 26 and end approximately at the level of the end of the mounting body 16 facing away from the cap 14
  • Insulator support body 26 has a circular metal coating 32 applied.
  • the metal coating 32 has a circular metal layer region 34 arranged coaxially to the housing 12 or to the cap 14. From the edge of the metal layer region 34, two rectilinear gaps 36, which are spaced apart and run parallel to one another, extend into the metal layer region 34.
  • the depth of these gap recesses is greater than the radius of the metal layer region 34, so that a small-area metal layer web 38 remains between the two gap recesses 36.
  • the metal layer region 34 is divided into two subregions 40 which are connected to one another via the web region 38. Each section 40 is electrically connected to a pin 28.
  • the partial regions 40 represent the contacting ends 42 of the connecting pins 28, to which an electrical ignition bridge 44 in the form of the web region 38 of the metal coating 32 is electrically connected.
  • the electrical insulation of the metal coating 32 relative to the housing 12 is ensured on the one hand by the insulator carrier body 26 and on the other hand by the relatively wide ring spacing area 46 between the metal coating 32 and the housing cap 14.
  • the metal coating 32 abuts the primer 20, wherein it is “embedded” in the priming material 24 of the primer 20.
  • connection ends 48 facing away from the contacting ends 42 When an ignition voltage is applied to the connection ends 48 facing away from the contacting ends 42, the electrical current flows via the contacting ends 42 and the narrow metal web area 38, which heats up and becomes hot as a result of the current flow and thereby initiates the ignition material 24 of the ignition set 20.
  • a further metal coating 52 is applied to the underside 50 of the insulator carrier body 26 facing away from the primer 20.
  • the metal coating 52 has the shape of a circular area which is divided into two semicircular metal layer regions 56 by a gap 54 running along the diameter between the two connecting pins 28.
  • the two metal layer regions 56 are electrically insulated from one another by the gap 54 and are each electrically connected to a connecting pin 28.
  • the metal coating 52 coaxial to the housing 12 has a ring spacing 58 from the mounting body 16, which is smaller than the ring spacing 46 between the metal coating 32 and the housing cap 14 on the upper side 30 of the insulator carrier body 26.
  • the width of the ring spacing or gap 58 is less than two thirds of the width of the ring spacing or gap 46.
  • a closure element 64 is inserted into the mounting body 16.
  • the closure element 64 has a rigid disk 66 made of non-conductive material opposite the carrier body 26 and a potting compound 68.
  • the connecting pins 28 extend through the washer 66 and the potting compound 68.
  • the arrangement of the closure element 64 at a distance from the support body 26 creates a cavity 70 below it, which is delimited and closed by the disk 66, the support body 26 and the section of the mounting body 16 extending between the two.
  • Cavity 70 is also the target discharge gap 62 in the form of the ring spacing or annular gap 58 between the metal coating 52 on the underside 50 of the support body 26 and the mounting body 16.
  • the sparkover between the metal coating 52 and the housing mounting body 16 thus takes place in a defined environment that is not exposed to environmental influences. This increases the safety and functional reliability of the ignition element 10, which relates to protection against unwanted ignition due to electrostatic charging.
  • the annular gap 46 to the housing cap 14 When the ignition bridge 44 is formed by applying the metal coating 32 to the carrier body 26, the annular gap 46 to the housing cap 14 must be present for insulation with respect to the housing 12. In order to arrange the connecting pins 28 as far apart as possible, the annular gap 46 is relatively narrow. But this has also created a target discharge path to the housing 12. So that the sparkover does not occur via the annular gap 46 and thus in the primer 20, the annular gap 58 is formed in the electrical ignition element 10 between the connecting pins 28 and the housing 12 on the underside of the carrier body 26. This annular gap 58, which is narrower than the annular gap 46, represents the actual target discharge path 62, via which the sparkover occurs from a certain electrostatic charge without the igniter 20 igniting.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP93106695A 1992-04-29 1993-04-24 Amorce électrique à espace de décharge destiné Withdrawn EP0567959A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4214033 1992-04-29
DE19924214033 DE4214033A1 (de) 1992-04-29 1992-04-29 Elektrisches zuendelement mit soll-entladungsstrecke

Publications (2)

Publication Number Publication Date
EP0567959A2 true EP0567959A2 (fr) 1993-11-03
EP0567959A3 EP0567959A3 (fr) 1994-03-16

Family

ID=6457709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93106695A Withdrawn EP0567959A2 (fr) 1992-04-29 1993-04-24 Amorce électrique à espace de décharge destiné

Country Status (2)

Country Link
EP (1) EP0567959A2 (fr)
DE (1) DE4214033A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0658739A2 (fr) * 1993-11-18 1995-06-21 Ici Americas Inc. Allumeur pour airbag et son procédé de fabrication
AT522U1 (de) * 1994-03-23 1995-12-27 Hirtenberger Ag Antriebsvorrichtung fuer rueckhaltesysteme in kraftfahrzeugen
US5847309A (en) * 1995-08-24 1998-12-08 Auburn University Radio frequency and electrostatic discharge insensitive electro-explosive devices having non-linear resistances
US6105503A (en) * 1998-03-16 2000-08-22 Auburn University Electro-explosive device with shaped primary charge
US6634299B2 (en) 2000-11-27 2003-10-21 Trw Airbag Systems Gmbh & Co. Kg Gas generator
US6772692B2 (en) 2000-05-24 2004-08-10 Lifesparc, Inc. Electro-explosive device with laminate bridge
US20160102957A1 (en) * 2014-10-08 2016-04-14 Fr. Sobbe Gmbh Chemical Detonator with Electric Trigger

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19617481A1 (de) * 1996-05-02 1997-11-06 Dynamit Nobel Ag Elektrische Anzündeinrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333538A (en) * 1966-06-09 1967-08-01 Hercules Inc Electric initiator structure
GB2018959A (en) * 1978-04-03 1979-10-24 Thiokol Corp Electric Safety Squib
US4261263A (en) * 1979-06-18 1981-04-14 Special Devices, Inc. RF-insensitive squib
DE3415625A1 (de) * 1984-04-26 1985-10-31 Dynamit Nobel Ag, 5210 Troisdorf Elektrisches zuendelement mit soll-funkenstrecke

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333538A (en) * 1966-06-09 1967-08-01 Hercules Inc Electric initiator structure
GB2018959A (en) * 1978-04-03 1979-10-24 Thiokol Corp Electric Safety Squib
US4261263A (en) * 1979-06-18 1981-04-14 Special Devices, Inc. RF-insensitive squib
DE3415625A1 (de) * 1984-04-26 1985-10-31 Dynamit Nobel Ag, 5210 Troisdorf Elektrisches zuendelement mit soll-funkenstrecke

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0658739A2 (fr) * 1993-11-18 1995-06-21 Ici Americas Inc. Allumeur pour airbag et son procédé de fabrication
EP0658739A3 (fr) * 1993-11-18 1995-11-29 Ici America Inc Allumeur pour airbag et son procédé de fabrication.
AT522U1 (de) * 1994-03-23 1995-12-27 Hirtenberger Ag Antriebsvorrichtung fuer rueckhaltesysteme in kraftfahrzeugen
US5847309A (en) * 1995-08-24 1998-12-08 Auburn University Radio frequency and electrostatic discharge insensitive electro-explosive devices having non-linear resistances
US5905226A (en) * 1995-08-24 1999-05-18 Auburn University Radio frequency and electrostatic discharge insensitive electro-explosive devices having non-linear resistances
US6272965B1 (en) * 1995-08-24 2001-08-14 Auburn University Method of forming radio frequency and electrostatic discharge insensitive electro-explosive devices
US6105503A (en) * 1998-03-16 2000-08-22 Auburn University Electro-explosive device with shaped primary charge
US6772692B2 (en) 2000-05-24 2004-08-10 Lifesparc, Inc. Electro-explosive device with laminate bridge
US6925938B2 (en) 2000-05-24 2005-08-09 Quantic Industries, Inc. Electro-explosive device with laminate bridge
US6634299B2 (en) 2000-11-27 2003-10-21 Trw Airbag Systems Gmbh & Co. Kg Gas generator
US20160102957A1 (en) * 2014-10-08 2016-04-14 Fr. Sobbe Gmbh Chemical Detonator with Electric Trigger
US9551556B2 (en) * 2014-10-08 2017-01-24 Fr. Sobbe Gmbh Chemical detonator with electric trigger

Also Published As

Publication number Publication date
DE4214033A1 (de) 1993-11-04
EP0567959A3 (fr) 1994-03-16

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