EP0041523B1 - Perfectionnements aux dispositifs de coupure a conducteur destructible par effet pyrotechnique avec systeme fusible en derivation - Google Patents

Perfectionnements aux dispositifs de coupure a conducteur destructible par effet pyrotechnique avec systeme fusible en derivation Download PDF

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Publication number
EP0041523B1
EP0041523B1 EP80902391A EP80902391A EP0041523B1 EP 0041523 B1 EP0041523 B1 EP 0041523B1 EP 80902391 A EP80902391 A EP 80902391A EP 80902391 A EP80902391 A EP 80902391A EP 0041523 B1 EP0041523 B1 EP 0041523B1
Authority
EP
European Patent Office
Prior art keywords
intermediate part
destructible
bore
destructible conductor
piston
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.)
Expired
Application number
EP80902391A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0041523A1 (fr
Inventor
Jean-Pierre Cinquin
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.)
Lucien Ferraz et Cie SA
Original Assignee
Lucien Ferraz et Cie SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucien Ferraz et Cie SA filed Critical Lucien Ferraz et Cie SA
Publication of EP0041523A1 publication Critical patent/EP0041523A1/fr
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Publication of EP0041523B1 publication Critical patent/EP0041523B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/10—Adaptation for built-in fuses
    • H01H9/106—Adaptation for built-in fuses fuse and switch being connected in parallel
    • 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

Definitions

  • the present invention relates to devices for breaking an electrical circuit by pyrotechnic effect with a fused bypass system, according to the preamble of claim 1.
  • Apparatuses are known in which a punching piston is repelled by a pyrotechnic charge so as to cut a destructible conductor.
  • Document DE-A-1 904 244 describes a breaking device comprising three successive metal parts arranged substantially along the same axis, namely an upstream part constituted by a socket closed by a plug and in which the load is disposed with a filling mass , an intermediate part or connecting part which forms in a way the integral extension of the bottom of the sleeve to which it is connected only by an annular zone of small thickness, and a downstream part or conduction part, inside which the connecting piece or intermediate part is slidably engaged.
  • the intermediate part is torn off from the bottom of the upstream part and is projected inside the downstream part, which is provided with means for stopping its travel and locking it in position.
  • the electric circuit is then cut, all the intensity goes through the fuse system which jumps instantly.
  • the current can flow between the intermediate part and the downstream part only through the contact established between these two parts.
  • contact is not always perfect, especially in the case of aggressive atmospheres which tend to attack the surfaces concerned.
  • a significant contact resistance then appears and there is a voltage drop and overheating.
  • the highly ionized combustion gases spread in the space which then separates the upstream part from the intermediate part torn from it and projected to the inside the downstream part, which favors the formation of the breaking arc and tends to maintain it.
  • the filling mass which surrounds the charge can be constituted by what is called an arc extinguishing material (silica powder, for example), but the action of such a material is obviously hampered by the presence ionized gases.
  • the invention aims to improve the devices of the kind in question, as mentioned according to the characterizing part of claim 1.
  • the invention uses, as is known in the prior art, a punch piston slidably mounted in the upstream part so as to be interposed between the pyrotechnic charge and the metal elements conductors to be cut, that is to say in the present case the annular zone which connects the bottom of the upstream part to the intermediate part.
  • the intermediate part is in one piece with the downstream part to which it is connected by another annular zone of small cross section, so that the whole of the destructible conductor constitutes only one unique piece.
  • the device represented in FIG. 1 comprises a destructible conductor 1 having the shape of a substantially cylindrical body which can be divided into three parts starting from the left, namely an upstream part 1a in the form of a socket, then an intermediate part 1b of which the diameter is reduced to a considerable extent by an annular groove 1c and finally a downstream part 1d comprising a blind bore 1e of diameter barely greater than that of the intermediate part 1b.
  • the upstream part 1a delimits a cylindrical interior space whose bottom 1f is in the form of a flared truncated cone with a cylindrical central depression 1g of shallow depth and of diameter slightly smaller than that of the intermediate part 1b.
  • the arrangement is such that this depression leaves only a 1 h connection zone with a small cross section between this part 1 b and the upstream part 1 a.
  • connection zone 1 i with a relatively small section.
  • a sleeve 2 of small thickness made of insulating material.
  • a piston 3 of laminated insulating material with high non-thermoplastic mechanical strength the face of which faces towards the bottom of said space is shaped so as to correspond to the profile thereof, namely with a frustoconical surface 3a and a central cylindrical boss 3b, it being noted however that the length of this boss is notably greater than the depth of the depression 1g.
  • the piston 3 is normally completely pushed back to the left so that its boss 3b touches the bottom of the depression 1g, so that an empty space 4 of appreciable width is formed between the frustoconical surfaces facing the bottom of the part 1a and this piston 3.
  • the face of the piston 3 opposite the boss 3b is hollowed out with a blind bore 3c in which is engaged one of the ends of a pyrotechnic engine 5.
  • the latter comprises a main body metallic cap 5a containing the pyrotechnic charge proper, a piston 5b which protrudes from this body to come to the bottom of the blind bore 3c and at its opposite end a head 5c to which lead the electrical ignition conductors 6.
  • the body 5a is provided with a rib or flange 5d against which bears a ring 7 of thermosetting material clamped by the inner rim of a metal crown 8 screwed into the threaded outlet of the upstream part 1a.
  • the intermediate part 1b is pierced axially with a tapped hole into which is screwed the end of a rod 9 which extends into the blind bore 1e of the downstream part 1d.
  • the outlet of this bore is internally threaded to receive a metal plug 10 pierced with an axial bore 10a with a small cone angle converging towards the outside, this bore receiving the end 9a of the rod 9, provided at a cone angle identical.
  • the groove 1c which defines the intermediate part 1b is closed by a sleeve 11 extending on either side thereof over a fraction of the length of the upstream and downstream parts 1a and 1d.
  • This sleeve is made of thermosetting material reinforced with glass fibers so as to have a high mechanical tensile strength in the longitudinal direction. It is moored to the aforementioned upstream and downstream parts by means of metal studs 12 whose ends opposite the axis of the conductor 1 are covered by the material of the sleeve or by an attached coating, the whole so that these studs are maintained in place and isolated from the outside atmosphere.
  • the sleeve 11 can be provided and mounted so as to close the groove 1c in a perfectly sealed manner, if desired.
  • the device finally comprises several fusible cartridges 13 regularly arranged around the sleeve 11.
  • the number of these cartridges can vary depending on the case, the essential being only that there are at least two.
  • the ends of these cartridges are fitted with metal contact brackets 14, the horizontal branch of which is permanently fixed to the upstream and downstream parts 1a and 1d of the destructible conductor 1 beyond the sleeve 11 by screws 15.
  • the device To use the device that has just been described, it is mounted on a suitable support by means of metal clamping collars coming to surround the ends of the upstream and downstream parts 1a and 1d to constitute circuit terminals.
  • the current normally passes almost entirely through the intermediate part 1b whose ohmic resistance is much lower than that of all of the cartridges 13 which are therefore crossed only by a very small fraction of the intensity thereof and do not undergo no appreciable heating.
  • the wires 6 being connected to a suitable control device, for example to an overcurrent detector, when the latter sends a signal, the charge contained by the motor 5 explodes.
  • the inner piston 5b of this engine is therefore pushed to the left and the force applied to it is sufficient for the boss 3b, acting like a punch, to shear the connection zones 1h h and 1i i of the zone intermediate 1 with parts 1 a and 1d.
  • a suitable control device for example to an overcurrent detector
  • the annular chamber or sectioning chamber 16 defined by the annular groove 1c remains isolated from the outside and therefore there can not be formed there a surface deposit of dust or other impurities liable to carry out a path of travel between the upstream and downstream parts 1a and 1d during the overvoltage which follows the operation of the cartridges 13. It is even possible, if desired, to fill this chamber 16 with a suitable solid, liquid, or even gaseous material to oppose any arc formation during such an overvoltage.
  • this sleeve is made very thick and provision is made in this thickness for longitudinal bores inside which the cartridges can be produced by arranging fuses with a mass of arc extinguishing material and closing the whole with two metal heads, in the manner well known in the art.
  • this ring of cartridges can be produced in a thick insulating sleeve attached to the sleeve 11 of FIG. 1 and 2.

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  • Fuses (AREA)
EP80902391A 1979-12-12 1980-12-10 Perfectionnements aux dispositifs de coupure a conducteur destructible par effet pyrotechnique avec systeme fusible en derivation Expired EP0041523B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7931174 1979-12-12
FR7931174A FR2471662A1 (fr) 1979-12-12 1979-12-12 Perfectionnements aux dispositifs de coupure a conducteur destructible par effet pyrotechnique avec systeme fusible en derivation

Publications (2)

Publication Number Publication Date
EP0041523A1 EP0041523A1 (fr) 1981-12-16
EP0041523B1 true EP0041523B1 (fr) 1984-11-28

Family

ID=9232961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80902391A Expired EP0041523B1 (fr) 1979-12-12 1980-12-10 Perfectionnements aux dispositifs de coupure a conducteur destructible par effet pyrotechnique avec systeme fusible en derivation

Country Status (8)

Country Link
US (1) US4385216A (enExample)
EP (1) EP0041523B1 (enExample)
JP (2) JPS56501783A (enExample)
BE (1) BE887194A (enExample)
DE (1) DE3069722D1 (enExample)
DK (1) DK156499C (enExample)
FR (1) FR2471662A1 (enExample)
WO (1) WO1981001770A1 (enExample)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3367265B2 (ja) * 1995-04-06 2003-01-14 富士電機株式会社 電流遮断装置
RU2187165C2 (ru) * 2000-03-15 2002-08-10 Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики Датчик положения
KR100851478B1 (ko) 2003-08-08 2008-08-08 델피 테크놀로지스 인코포레이티드 회로 차단 장치와, 전기 회로의 접속을 위한 안전 장치와, 전기 회로의 안전을 향상시키는 방법
FR2869450B1 (fr) * 2004-04-23 2007-03-02 Conception Et Dev Michelin Sa Dispositif de coupure pour circuit electrique, a declenchement pilote
EP1710871B1 (de) * 2005-04-08 2007-09-05 Auto Kabel Managementgesellschaft mbH Stromunterbrecher für elektrische Versorgungsleitungen von Kraftfahrzeugen
ATE390702T1 (de) * 2005-09-22 2008-04-15 Delphi Tech Inc Vorrichtung zum trennen eines elektrischen leiters
DE102008044774A1 (de) * 2008-08-28 2009-10-15 Audi Ag Parallelschaltung aus einer pyrotechnischen Sicherung und einer weiteren Sicherung für ein Kraftfahrzeug
DE102008055904B4 (de) * 2008-11-05 2018-03-22 Auto-Kabel Management Gmbh Steckverbindung für ein Insassenschutzmittel
DE102010011150B4 (de) * 2010-03-11 2012-03-29 Auto-Kabel Managementgesellschaft Mbh Elektrische Sicherung für Kraftfahrzeugenergieleitungen und Herstellungsverfahren für eine solche Sicherung
FR3051281B1 (fr) * 2016-05-16 2020-06-05 Mersen France Sb Sas Dispositif de coupure electrique et systeme electrique securise comprenant un tel dispositif
FR3099287B1 (fr) * 2019-07-25 2023-06-30 Arianegroup Sas Dispositif de coupure pyrotechnique
DE102023107532A1 (de) 2023-03-24 2024-09-26 Audi Aktiengesellschaft Pyro-Sicherung zum Durchtrennen eines elektrischen Leiters und Kraftfahrzeug
WO2026020007A1 (en) * 2024-07-17 2026-01-22 Sensata Technologies, Inc. Pyrofuse assemblies with pyrotechnically driven disconnection system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2816196A (en) * 1951-05-04 1957-12-10 Roland G Dandelin Detonator electrical switch
US2983801A (en) * 1959-02-20 1961-05-09 Gen Electric High current disconnect device
US3264438A (en) * 1964-04-29 1966-08-02 Atlas Chem Ind Positive action circuit breaking switch
GB1240035A (en) * 1968-01-20 1971-07-21 Fuji Electric Co Ltd Electric circuit breaker
JPS4924742A (enExample) * 1972-06-30 1974-03-05
JPS5134113A (ja) * 1974-09-18 1976-03-23 Showa Denko Kk Gurishinnofunbetsushutokuhoho

Also Published As

Publication number Publication date
JPS56501783A (enExample) 1981-12-03
FR2471662A1 (fr) 1981-06-19
DK156499C (da) 1990-04-23
WO1981001770A1 (fr) 1981-06-25
DK350981A (da) 1981-08-07
EP0041523A1 (fr) 1981-12-16
FR2471662B1 (enExample) 1982-10-08
US4385216A (en) 1983-05-24
BE887194A (fr) 1981-05-14
JPH01135634U (enExample) 1989-09-18
DE3069722D1 (en) 1985-01-10
DK156499B (da) 1989-08-28

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