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WO1987004017A1 - Ecartement des electrodes utilise notamment comme intervalle explosif en serie d'une bougie d'allumage d'un moteur a combustion interne - Google Patents

Ecartement des electrodes utilise notamment comme intervalle explosif en serie d'une bougie d'allumage d'un moteur a combustion interne Download PDF

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Publication number
WO1987004017A1
WO1987004017A1 PCT/EP1986/000728 EP8600728W WO8704017A1 WO 1987004017 A1 WO1987004017 A1 WO 1987004017A1 EP 8600728 W EP8600728 W EP 8600728W WO 8704017 A1 WO8704017 A1 WO 8704017A1
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WO
WIPO (PCT)
Prior art keywords
electrode
spark
spark gap
gap
housing
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/EP1986/000728
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German (de)
English (en)
Inventor
Walter Bosshard
Bernd Volle
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.)
Cerberus AG
Original Assignee
Cerberus 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 Cerberus AG filed Critical Cerberus AG
Publication of WO1987004017A1 publication Critical patent/WO1987004017A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H01T1/20—Means for starting arc or facilitating ignition of spark gap
    • H01T1/22—Means for starting arc or facilitating ignition of spark gap by the shape or the composition of the electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps

Definitions

  • Spark gap in particular for use as a pre-spark gap for a spark plug of an internal combustion engine
  • the invention relates to a spark gap with a gas-filled housing made at least partially of electrically insulating material and two opposing, electrically conductive electrodes, between which a gas discharge takes place when a certain ignition voltage is exceeded, one of the electrodes enclosing the other electrode in such a way that a discharge space between the electrodes is formed, which is closed by an annular gap between the two electrodes.
  • Spark gaps of this type are known, for example, from GB-A-544 264; they are used in particular in ignition systems of internal combustion engines as pre-spark gaps to the spark plugs. Such pre-spark gaps are intended to prevent the formation of an arc or glow discharge through a spark plug in the combustion chamber of an engine. Instead, only a breakthrough discharge at high voltage, and thus an optimal use of the energy of the ignition sparks, should be achieved. This not only allows for a better Achieve fuel utilization, but also a reduced emission of pollutants, especially nitrogen oxides. In addition, mixtures that are difficult to ignite can also be reliably ignited, so that such ignition systems can be used especially for environmentally friendly lean-burn engines (R. Maly et al,: "Automobil-Industrie", 1978, No. 3, pages 37-41).
  • the pre-spark gaps themselves have a low energy consumption and that the main part of the energy is available for igniting the fuel mixture in the engine.
  • the capacitance of the spark gap should be significantly smaller than that of the spark plug so that when the ignition voltage is built up, the main part of the charging voltage of the ignition capacitor is on the spark gap. This ensures that the spark gap reaches its ignition voltage as required before the spark plug.
  • spark gaps must withstand a very large number of gas discharges of the order of magnitude of hundreds of millions without significantly changing their operating data, which makes it necessary to ensure tight tolerances of the ignition voltage over a long operating period with an extraordinarily large number of gas discharges.
  • spark gaps previously known from GB-A-544 264 meet the requirements mentioned only in the initial state. An inadmissible change in the operating data is evident during a longer period of operation.
  • the discharge space is not formed, as in the example mentioned above, by a sleeve-shaped electrode which surrounds a central electrode.
  • EP-A-99 522 for example, such a spark gap is described in which the discharge area is formed by two electrodes facing each other with their flat end faces and the electrically insulating housing.
  • the use of such spark gaps in internal combustion engines was limited. For general use, the operating data showed inadmissible fluctuations and insufficient stability, especially during prolonged operation.
  • the object of the invention is to avoid the above-mentioned disadvantages of the prior art and to create a spark gap of the type mentioned at the beginning, in particular for use as a pre-spark gap of a spark plug of an internal combustion engine, which has defined operating data, especially ignition properties, with narrower tolerances than before, which are maintained even with longer periods of operation and with extremely vigorous gas discharges, so that the spark gap remains functional even during prolonged operation in an internal combustion engine.
  • this object is achieved in that the electrodes are designed and arranged such that the annular gap formed by the two electrodes, viewed from the discharge space, faces away from electrically insulating parts of the housing, and stabilizes the gas discharge at a point away from the annular gap is.
  • the invention is based on the knowledge that adherence to and long-term maintenance of narrower tolerances of the operating data of the spark gap is made possible by largely maintaining the insulation properties of the electrically insulating housing parts.
  • the enclosure of the discharge space by an electrically conductive electrode and the stabilization of the gas discharge away from the annular gap of the discharge spaces prevents the influence of fluctuations and changes in the insulation properties of the housing to a large extent.
  • a deposit of atomized electrode material, which inevitably occurs with every gas discharge, on the housing insulator is avoided by the fact that the annular gap from which the atomized material emerges faces away from the insulator.
  • the precipitation therefore takes place on parts that are metallic conductive anyway and not on the insulator, where it would lead to sliding discharges and field distortions, so that a significantly improved long-term stability of the operating properties is achieved.
  • the gas discharge is initiated at a point away from the annular gap and the design and arrangement of the electrodes prevent the gas discharge from subsequently running away from this point, this point at which the gas discharge is spatially stabilized and on the electrode sputtering occurs, is as far away as possible from the annular gap, where the sputtered material can escape from the discharge area and, after deflection, could still reach the housing insulator to a small extent.
  • the discharge site can be stabilized with advantage by activating the tip of the central electrode connected as a cathode, for example by designing it as a storage cathode which contains a substance with a low work function of electrons.
  • the electrodes are advantageously designed in such a way that the point of greatest field strength is adjacent to the activating substance, so that the ignition takes place directly next to the point of the subsequent breakdown channel of the discharge.
  • additional ignition electrodes, pre-ionization or field stabilizing agents can be of particular advantage.
  • Figure 1 shows a first spark gap in axial section
  • Figure 2 shows a second spark gap in axial section
  • FIG. 3 shows a third spark gap in axial section.
  • electrodes 2 and 3 made of electrically conductive material, preferably made of low-gas metals such as copper, are inserted at both ends in a cylindrical or tubular housing 1 made of electrically insulating material, for example made of ceramic, glass or porcelain, Iron, nickel, cobalt, in pure form, or as an alloy thereof, the connection to the housing 1 being made in a known manner, for example with a metal-ceramic connection.
  • One of the electrodes 2 is designed as a central electrode with a rod k and a body 5, which carries an activating substance 6 on its end face made of a substance with a low electron work function, which promotes electron emission, for example an alkali or alkaline earth substance.
  • the other electrode 3 is designed asymmetrically to this as a hood or sleeve 7 and is arranged in such a way that it encloses the central electrode or its rod-shaped part 4 and the body 5 in such a way that only an annular gap 8 remains open between the hood 7 and the rod 4, with which the interior 7 of the hood 7, in which the discharge takes place, is connected to the exterior 1 enclosed by the housing 1.
  • the annular gap 8 between the end 7 of the hood-shaped electrode 7 and the rod-shaped electrode 4 faces the electrode plate 2 when viewed from the discharge space 7, i.e.
  • the outer end 7 of the electrode sleeve 7 is slightly drawn in so that the distance from the housing 1 is greater here than at the inner part 7 2 , which forms such a narrow gap with the housing that practically no precipitation can get there.
  • the housing 1 is filled with a high pressure gas, such as nitrogen or hydrogen and the like, at a pressure of several bar, preferably above 10 bar, for example approx. 20 bar.
  • a high pressure gas such as nitrogen or hydrogen and the like
  • gas mixtures of the gases mentioned with other electronegative gases such as SF 6 , various hydrocarbons, and fluorine-chlorine hydrocarbons can also be used.
  • the housing 1 is sealed gas-tight in a known manner with a closure 9.
  • the type of gas and pressure are selected so that the spark gap has the necessary ignition voltage, for example in the range of 20-30 kV.
  • the end face of the electrode body 5 connected as a cathode is provided with sharp edges 5, while the remaining edges of the various electrode parts are rounded.
  • the peak discharge ensures that the ignition takes place directly adjacent to the point where the emission-promoting substance 6 is attached and where the further discharge takes place.
  • the location of the gas discharge is determined by these measures. Since this location is far away from the gap 8 between the electrodes, the electrode material atomized at the discharge location hardly migrates to the gap 8 and therefore cannot reach the inner wall of the housing 1 or only to a very limited extent.
  • the exit of the mostly positively charged metal ions from the gap 8 can be blocked by a negatively charged ring 10 which extends through the housing 1 to the gap 8.
  • the precipitation of evaporated activation mass 6 also remains limited to the electrode surfaces that are far away from the gap 8.
  • the spark gap described shows a considerably better constancy of the ignition and discharge properties than previously known spark gaps.
  • the overall dimensions of the spark gap are in the centimeter range and those of the discharge gap in the millimeter range. Together with the selected high-pressure gas filling, this means that when connected in series with a spark plug, the breakdown voltage is kept at the desired high values around 25 kV, but only a small part of the discharge energy is consumed by the spark gap when the discharge is ignited, and the rest of the energy is available for discharge in the engine combustion chamber. In this way, even fuel mixtures that are quite unwilling to ignite can be safely ignited over longer operating times.
  • FIG. 2 shows a similar spark gap with a housing 11 and two electrodes 12 and 13.
  • the cathode 12 has a central rod 14 which, on its end face 15, has an activation reservoir 16? possesses, ie the electrode is designed as a supply cathode.
  • the other electrode 13 has a cathode rod 14 enveloping it cylindrical tube 17 which forms an annular gap 18 at its open end 17 1 with the rod 14. Since the gas discharge is stabilized at the point of the activation reservoir 16, which is also far away from the gap 18, atomized electrode material, which could impair the insulation, cannot escape from the gap 18 or only in an extremely small amount and onto the inner wall of the housing 11 arrive.
  • the outer surface of the cylindrical electrode tube 17 has one or more shoulders 17, so that here too the distance between the electrode 17 and the housing 11 at the open end 17 is greater than at the inner part 17 2 , where the distance between the
  • Electrode is smallest from the housing. In this way it is achieved that any small amount of material deposited on the housing inner wall has the least possible effect.
  • a metal ring 31 can be provided at a free or preselected potential, which has a field-stabilizing effect and can also have a shading effect. Annular notches on the inside of the housing can also be advantageous.
  • the gas filling is analogous to the above-describedianssbei game ..
  • a gas filling nozzle 19 is provided on the tubular electrode 13, which is closed or squeezed off after the gas filling, and over which a protective hood 20 is attached.
  • the properties and function of this spark gap are therefore analogous to the exemplary embodiment described above.
  • FIG. 3 shows a further development of the exemplary embodiment described in FIG. 2, in which, for the purpose of even greater security against deterioration in insulation, with a long operating time between the tubular Electrode 17 and the housing wall 11 additional baffles 30 are provided.
  • the housing wall can also have shading wall elements.
  • the gas discharge gap can also be ignited as quickly and as precisely as possible by pre-ionizing the ignition gap, for example by means of known radioactive substances in solid form or as an admixture to the gas filling in gaseous form, or by an auxiliary discharge.
  • an electronegative gas can be added to the gas in the housing.
  • This additive advantageously consists of a hydrocarbon, a halogenated hydrocarbon, such as, for example, a fluorochlorohydrocarbon, or of sulfur hexafluoride.
  • Priority reference number 25 / 86-8 deadline. Publication will be repeated if changes are made.
  • Spark arrangement for internal combustion engines for achieving a reliable ignition even of a fuel mixture which is very reluctant to ignite, by means of a small-dimension spark gap which is connected in series with a conventional spark plug.
  • a spark-gap a long-term constancy of operating parameters is achieved for millions of ignitions by the fact that an electrode (17) enve-lopes, in the manner of a sleeve, another electrode (14) so that a discharge space is formed between the electrodes, said space being linked with the casing (11) by only a narrow gap (18).
  • the gas discharge is stabilized locally at a point which is as far as possible from the gap (18), for example by means of an emission-promoting activation material (16) of the front face of the inner electrode (14), so that the emergence of disintegrated electrode material from the gap (18) is prevented, as well as its deposition on the wall of the casing, and the operating parameters of the spark gap remain unchanged.
  • the ignition of the spark gap in the immediate vicinity of the electrode activation material is effected b choosing a suitable geometry for the electrodes and possibly by appropriate pre-ionization.
  • the gas discharge is locally stabilized at a point as far away as possible from the gap (18), for example by an emission-promoting activity (16) on the end face of the inner electrode (14), so that the atomized electrode material emerges from the gap (18) and the precipitation on the housing wall is prevented and the operating data of the spark gap is retained.
  • the ignition of the spark gap in the immediate vicinity of the electrode activation is brought about by a suitable geometry of the electrodes and, if necessary, by targeted pre-ionization.
  • Spark gap in particular for use as a pre-spark gap for a spark plug of an internal combustion engine
  • the invention relates to a spark gap with a gas-filled housing made at least partially of electrically insulating material and two opposing, electrically conductive electrodes, between which a gas discharge takes place when a certain ignition voltage is exceeded, one of the electrodes enclosing the other electrode in such a way that a discharge space between the electrodes is formed, which is closed by an annular gap between the two electrodes.
  • Spark gaps of this type are known, for example, from GB-A-544 264; they are used in particular in ignition systems of internal combustion engines as pre-spark gaps to the spark plugs. Such pre-spark gaps are intended to prevent the formation of an arc or glow discharge through a spark plug in the combustion chamber of an engine. Instead, only a breakthrough discharge at high voltage, and thus an optimal use of the energy of the ignition sparks, should be achieved. This not only allows for a better Achieve fuel utilization, but also a reduced emission of pollutants, especially nitrogen oxides. In addition, mixtures that are difficult to ignite can also be safely ignited, so that such ignition systems can be used especially for environmentally friendly lean-burn engines (R. Maly et al .: "Automobil-Industrie", 1978, No. 3, pages 37-41).
  • the pre-spark gaps themselves have a low energy consumption and that the main part of the energy is available for igniting the fuel mixture in the engine.
  • the capacitance of the spark gap should be significantly smaller than that of the spark plug so that when the ignition voltage is built up, the main part of the charging voltage of the ignition capacitor is on the spark gap. This ensures that the spark gap reaches its ignition voltage as required before the spark plug.
  • spark gaps must withstand a very large number of gas discharges of the order of magnitude of hundreds of millions without significantly changing their operating data, which makes it necessary to ensure tight tolerances of the ignition voltage over a long operating period with an extraordinarily large number of gas discharges.
  • spark gaps previously known from GB-A-544 264 meet the requirements mentioned only in the initial state. An inadmissible change in the operating data is evident during a longer period of operation.
  • the discharge space is not formed, as in the example mentioned above, by a sleeve-shaped electrode which surrounds a central electrode.
  • EP-A-99 522 for example, such a spark gap is described in which the discharge space is formed by two electrodes facing each other with their flat end faces and the electrically insulating housing.
  • the use of such spark gaps in internal combustion engines was limited. For general use, the operating data showed inadmissible fluctuations and insufficient stability, especially during prolonged operation.
  • the object of the invention is to avoid the above-mentioned disadvantages of the prior art and to create a spark gap of the type mentioned at the beginning, in particular for use as a pre-spark gap of a spark plug of an internal combustion engine, which has defined operating data, especially ignition properties, with narrower tolerances than before are adhered to, which are adhered to even with longer operating times and with an extraordinarily high number of gas discharges, so that the spark gap remains functional even during prolonged operation in an internal combustion engine.
  • this object is achieved in that the electrodes are designed and arranged such that the annular gap formed by the two electrodes, viewed from the discharge space, faces away from electrically insulating parts of the housing, and stabilizes the gas discharge at a point away from the annular gap is.
  • the invention is based on the knowledge that adherence to and long-term maintenance of narrower tolerances of the operating data of the spark gap is made possible by largely maintaining the insulation properties of the electrically insulating housing parts.
  • the enclosure of the discharge space by an electrically conductive electrode and the stabilization of the gas discharge away from the annular gap of the discharge space prevents the influence of fluctuations and changes in the insulation properties of the housing to a large extent.
  • a deposit of atomized electrode material, which inevitably occurs with every gas discharge, on the housing insulator is avoided by the fact that the annular gap from which the atomized material emerges faces away from the insulator.
  • the precipitation therefore takes place on parts that are metallic conductive anyway and not on the insulator, where it would lead to sliding discharges and field distortions, so that a significantly improved long-term stability of the operating properties is achieved.
  • the gas discharge is initiated at a point away from the annular gap and the design and arrangement of the electrodes prevent the gas discharge from subsequently running away from this point, this point at which the gas discharge is spatially stabilized and on electrode sputtering occurs, is as far away as possible from the annular gap, where the sputtered material can escape from the discharge space, and could still reach the housing insulator to a small extent after Ural guidance.
  • the discharge site can be stabilized with advantage by activating the tip of the central electrode connected as a cathode, for example by designing it as a storage cathode which contains a substance with a low work function of electrons.
  • the electrodes are advantageously designed in such a way that the point of greatest field strength is adjacent to the activating substance, so that the ignition takes place directly next to the point of the subsequent breakdown channel of the discharge.
  • additional ignition electrodes, pre-ionization or field stabilizing agents can be used. Be an advantage. The invention is explained in more detail with reference to the exemplary embodiments shown in the figures. Show it:
  • Figure 1 shows a first spark gap in axial section
  • Figure 2 shows a second spark gap in axial section
  • FIG. 3 shows a third spark gap in axial section.
  • electrodes 2 and 3 made of electrically conductive material, preferably made of low-gas metals such as copper, are inserted at both ends in a cylindrical or tubular housing 1 made of electrically insulating material, for example made of ceramic, glass or porcelain, Iron, nickel, cobalt, in pure form, or as an alloy thereof, the connection to the housing 1 being made in a known manner, for example with a metal-ceramic connection.
  • One of the electrodes 2 is designed as a central electrode with a rod 4 and a body 5, which carries an activating substance 6 on its end face made of a substance with a low electron work function, which promotes electron emission, for example an alkali or alkaline earth substance.
  • the other electrode 3 is designed asymmetrically to this as a hood or sleeve 7 and is arranged in such a way that it encloses the central electrode or its rod-shaped part 4 and the body 5 in such a way that only an annular gap 8 remains open between the hood 7 and the rod 4, with which the interior 7 of the hood 7, in which the discharge takes place, is connected to the exterior 1 enclosed by the housing 1.
  • the outer end 7 of the electrode sleeve 7 is slightly drawn in so that the distance from the housing 1 is greater here than at the inner part 7 2 , which forms such a narrow gap with the housing that practically no precipitation can get there.
  • the housing 1 is filled with a high pressure gas, such as nitrogen or hydrogen and the like, at a pressure of several bar, preferably above 10 bar, for example approx. 20 bar.
  • a high pressure gas such as nitrogen or hydrogen and the like
  • gas mixtures of the gases mentioned with other electronegative gases such as SF 6 , various hydrocarbons, and fluorine-chlorine hydrocarbons can also be used.
  • the housing 1 is closed in a known manner in a gas-tight manner with a closure 9.
  • the type of gas and pressure are selected so that the spark gap has the necessary ignition voltage, for example in the range of 20 - 30 kV.
  • the end face of the electrode body 5 connected as a cathode is provided with sharp edges 5, while the remaining edges of the various electrode parts are rounded.
  • the peak discharge ensures that the ignition takes place directly adjacent to the point where the emission-promoting substance 6 is attached and where the further discharge takes place.
  • the location of the gas discharge is determined by these measures. Since this location is far away from the gap 8 between the electrodes, the electrode material atomized at the discharge location hardly migrates to the gap 8 and therefore cannot reach the inner wall of the housing 1, or only to a very limited extent.
  • the exit of the mostly positively charged metal ions from the gap 8 can be blocked by a negatively charged ring 10 which extends through the housing 1 to the gap 8.
  • the precipitation of evaporated activation mass 6 also remains limited to the electrode surfaces that are far away from the gap 8.
  • the spark gap described shows a considerably better constancy of the ignition and discharge properties than previously known spark gaps.
  • the overall dimensions of the spark gap are in the centimeter range and those of the discharge gap in the millimeter range. Together with the selected high-pressure gas filling, this means that when connected in series with a spark plug, the breakdown voltage is kept at the desired high values around 25 kV, but only a small part of the discharge energy is consumed by the spark gap when the discharge is ignited, and the rest of the energy is available for discharge in the engine combustion chamber. In this way, even fuel mixtures that are unwilling to ignite can be safely ignited over longer operating times.
  • FIG. 2 shows a similar spark gap with a housing 11 and two electrodes 12 and 13.
  • the cathode 12 has a central rod 14 which has an activation reservoir 16 on its end face 15, ie. the electrode is designed as a storage cathode.
  • the other electrode 13 has a cathode rod 14 enveloping it cylindrical tube 17 which forms an annular gap 18 at its open end 17 1 with the rod 14. Since the gas discharge is stabilized at the point of the activation reservoir 16, which is also far away from the gap 18, atomized electrode material, which could impair the insulation, cannot escape from the gap 18 or only in an extremely small amount and onto the inner wall of the housing 11 arrive.
  • the outer surface of the cylindrical electrode tube 17 has one or more shoulders 17, so that here too the distance between the electrode 17 and the housing 11 at the open end 17 is greater than at the inner part 17 2 , where the distance between the
  • Electrode is smallest from the housing. In this way it is achieved that any small amount of material deposited on the housing inner wall has the least possible effect.
  • a metal ring 31 can be provided at a free or preselected potential, which has a field-stabilizing effect and can also have a shading effect. Annular notches on the inside of the housing can also be advantageous.
  • the gas filling is analogous to that of the game personssbei described above.
  • a gas filler neck 19 is provided on the tubular electrode 13, which is closed or squeezed off after the gas has been filled, and over which a protective hood 20 is attached.
  • the properties and function of this spark gap are therefore analogous to the exemplary embodiment described above.
  • FIG. 3 shows a further development of the exemplary embodiment described in FIG. 2, in which, for the purpose of even greater security against deterioration in insulation, with a long operating time between the tubular Electrode 17 and the housing wall 11 additional baffles 30 are provided.
  • the housing wall can also have shading wall elements.
  • the gas discharge gap can also be ignited as quickly and as precisely as possible by pre-ionizing the ignition gap, for example by means of known radioactive substances in solid form or as an admixture to the gas filling in gaseous form, or by an auxiliary discharge.
  • an electronegative gas can be added to the gas in the housing.
  • This additive advantageously consists of a hydrocarbon, a halogenated hydrocarbon, such as, for example, a fluorochlorohydrocarbon, or of sulfur hexafluoride.

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  • Spark Plugs (AREA)

Abstract

Allumage pour moteur à combustion interne permettant un allumage fiable même dans le cas d'un mélange de carburant très difficile à enflammer, au moyen d'un faible écartement des électrodes connectés en série avec ledit allumage classique. Cet écartement d'électrodes permet d'obtenir sur une longue durée des paramètres de fonctionnement constant pour des millions d'allumages, du fait qu'une électrode (17) enveloppe, à la manière d'un manchon, une autre électrode (14) de sorte qu'un intervalle de décharge est formé entre les électrodes, ledit intervalle étant lié avec le boîtier (11) uniquement par un faible entrefer (18). La décharge de gaz est stabilisée localement en un point situé aussi loin que possible de l'entrefer (18), par exemple grâce à une substance d'activation (16) des émissions d'électrons sur la face frontale de l'électrode intérieure (14), de manière à empêcher la sortie de l'entrefer (18) de particules d'électrode réduites en poussière et leur dépôt sur la paroi du boîtier, et à maintenir inchangés les paramètres de fonctionnement de l'écartement des électrodes. L'allumage de l'écartement des électrodes au voisinage immédiat de la substance d'activation des électrodes est réalisé grâce à une géométrie appropriée desdites électrodes et éventuellement grâce à une pré-ionisation adéquate.
PCT/EP1986/000728 1985-12-18 1986-12-10 Ecartement des electrodes utilise notamment comme intervalle explosif en serie d'une bougie d'allumage d'un moteur a combustion interne Ceased WO1987004017A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH25/86-8 1985-12-18
CH2586 1985-12-18

Publications (1)

Publication Number Publication Date
WO1987004017A1 true WO1987004017A1 (fr) 1987-07-02

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Application Number Title Priority Date Filing Date
PCT/EP1986/000728 Ceased WO1987004017A1 (fr) 1985-12-18 1986-12-10 Ecartement des electrodes utilise notamment comme intervalle explosif en serie d'une bougie d'allumage d'un moteur a combustion interne

Country Status (2)

Country Link
EP (1) EP0229303A1 (fr)
WO (1) WO1987004017A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3621254A1 (de) * 1986-06-25 1988-01-07 Siemens Ag Gasentladungsueberspannungsableiter
US5352953A (en) * 1991-04-05 1994-10-04 Yazaki Corporation Gas-filled discharge tube
CA2064942C (fr) * 1991-04-05 1998-11-03 Seiichi Wakabayashi Tube a decharge a gaz
US5225743A (en) * 1991-11-14 1993-07-06 Caterpillar Inc. High voltage switch

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB544264A (en) * 1941-01-13 1942-04-03 Lodge Plugs Ltd Improvements relating to electric spark gaps
US2431226A (en) * 1943-02-11 1947-11-18 Westinghouse Electric Corp Low-pressure gap device
DE2529536A1 (de) * 1975-07-02 1977-01-27 Siemens Ag Hochspannungsableiter
GB1505035A (en) * 1976-04-27 1978-03-22 Int Standard Electric Corp Overload protection tube
EP0024583A1 (fr) * 1979-08-24 1981-03-11 ANT Nachrichtentechnik GmbH Dispositif de dérivation de surtensions
GB2061644A (en) * 1979-10-19 1981-05-13 Claude Sa Lightning arrester for protecting electrical circuits
EP0099522A2 (fr) * 1982-07-23 1984-02-01 Siemens Aktiengesellschaft Eclateur comportant un boîtier rempli d'un gaz
DE3528556A1 (de) * 1984-12-20 1986-07-03 BERU Ruprecht GmbH & Co KG, 7140 Ludwigsburg Funkenstrecke

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB544264A (en) * 1941-01-13 1942-04-03 Lodge Plugs Ltd Improvements relating to electric spark gaps
US2431226A (en) * 1943-02-11 1947-11-18 Westinghouse Electric Corp Low-pressure gap device
DE2529536A1 (de) * 1975-07-02 1977-01-27 Siemens Ag Hochspannungsableiter
GB1505035A (en) * 1976-04-27 1978-03-22 Int Standard Electric Corp Overload protection tube
EP0024583A1 (fr) * 1979-08-24 1981-03-11 ANT Nachrichtentechnik GmbH Dispositif de dérivation de surtensions
GB2061644A (en) * 1979-10-19 1981-05-13 Claude Sa Lightning arrester for protecting electrical circuits
EP0099522A2 (fr) * 1982-07-23 1984-02-01 Siemens Aktiengesellschaft Eclateur comportant un boîtier rempli d'un gaz
DE3528556A1 (de) * 1984-12-20 1986-07-03 BERU Ruprecht GmbH & Co KG, 7140 Ludwigsburg Funkenstrecke

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Publication number Publication date
EP0229303A1 (fr) 1987-07-22

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