EP0378963B1 - Spark gap element for shielded mounting - Google Patents
Spark gap element for shielded mounting Download PDFInfo
- Publication number
- EP0378963B1 EP0378963B1 EP89730009A EP89730009A EP0378963B1 EP 0378963 B1 EP0378963 B1 EP 0378963B1 EP 89730009 A EP89730009 A EP 89730009A EP 89730009 A EP89730009 A EP 89730009A EP 0378963 B1 EP0378963 B1 EP 0378963B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- spark gap
- control electrode
- gap component
- potential
- 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 - Lifetime
Links
- 239000012212 insulator Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052914 metal silicate Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
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
- H01T13/00—Sparking plugs
- H01T13/46—Sparking plugs having two or more spark gaps
- H01T13/462—Sparking plugs having two or more spark gaps in series connection
- H01T13/465—Sparking plugs having two or more spark gaps in series connection one spark gap being incorporated in the sparking plug
Definitions
- the invention is in the field of electrical components and is to be used in the structural design of a spark gap component which, during operation, is arranged within a shield which surrounds the spark gap component with the interposition of a solid dielectric.
- spark gap components are used in particular in motor vehicles as spark gaps for spark plugs.
- a known spark gap component consists of a tubular insulator and two electrodes, one electrode being inserted in a vacuum-tight manner in one end and the other electrode in the other end of the insulator. In operation, one electrode carries the potential, while the other electrode has potential close to the earth. The two electrodes also have an essentially planar active surface, these surfaces being provided with a layer of a material which is resistant to erosion.
- This known spark gap component is intended for installation in a spark plug connector. In the installed state, the component is located in the through hole of an insulating body which is covered by a metal shield. The ignition voltage of the spark gap component is approximately 8 to 10 kV (DE-B-24 18 261).
- the dome-like electrodes are made of niobium, a control electrode being assigned to the cathode to stabilize the ignition voltage.
- This control electrode consists of a metallic cylinder placed on the ceramic insulator of the spark gap, which extends from the center of the ignition gap to the base of the cathode (US Pat. No. 4,475,055).
- spark gap components are also designed for higher ignition voltages.
- the active parts of the electrodes consist of titanium, zirconium and similar metals and the component is filled with an inert gas at a pressure of 0.8 to 10 bar (US-C-3 956 657).
- the spark gap component i.a. provided to attach an ignition aid to the inner wall of the insulator in the region of the discharge gap, the sum of the distances of the ignition aid from the rounded or chamfered electrode edges being greater than the approximately 0.5 mm electrode distance.
- the component referred to as the spark gap is essentially filled with nitrogen at a pressure of approximately 15 bar (EP-C-0 099 522).
- the invention is therefore based on the object to design the spark gap component so that the The ignition voltage is essentially independent of any subsequent shielding of the component, in particular to be designed such that the ignition voltage in the unshielded state is not significantly undercut by the ignition voltage in the shielded state.
- an annular control electrode is arranged, which is electrically connected to the potential-carrying electrode, the height distance between the control electrode and the active surface of the associated electrode is at most 10% of the smallest distance between the active surfaces of the two electrodes.
- the invention takes into account the knowledge that, at increasingly higher ignition voltages, the electrical field between the two electrodes of the spark gap component is influenced by a surrounding shield such that an increase in the field strength occurs at the peripheral edge of the active surface of the potential-carrying electrode. This lowers the ignition voltage.
- the electrical field is influenced in such a way that there are no significant differences in the area of interest in the shielded or unshielded state of the spark gap component.
- the effectiveness of the potential control according to the invention depends, inter alia, on the distance with which the shield surrounds the spark gap component, and in particular the electrodes, and also on how far the control electrode or the effective edge of the control electrode in the axial direction of the spark gap component is removed from the active surface of the potential-carrying electrode. The smaller the distance between the shields, the more precisely the position of the control electrode must be determined.
- the control electrode is expediently of metallic design and can consist, for example, of a galvanically applied metallization or a coated conductive silver layer.
- a wire ring or a band-shaped ring with a bandwidth of at least 1 mm or a metal cap which extends to the base part of the associated electrode and is soldered to the associated electrode, for example.
- control electrode only on the potential-carrying electrode is particularly useful when the shield is firmly connected to earth potential. If the potential for the shield is floating, it is necessary to assign a control electrode to both electrodes. However, this is also possible when the shield is grounded.
- spark gap component 1 which essentially consists of the tubular glass or ceramic insulator 2 and the two electrodes 3 and 4, the electrodes having active surfaces 5 and 6, respectively.
- the active surfaces are at a distance A of about 6 mm from one another.
- a cylindrical control electrode 7 is electrically connected to the electrode 3 and extends from the foot part 9 of the electrode 3 along the outer circumferential surface of the insulator 2 in the direction of the counter electrode 4 to the height of the active surface 5 of the electrode 3.
- the control electrode ends at a height distance a from the active surface of the electrode 3. This distance a is less than 10% of the distance A and is approximately 0.5 mm.
- the control electrode 7 consists of an applied metallization of a metal-silicate mixture.
- FIG. 3 shows an exemplary embodiment of this, wherein the spark gap component 1 is surrounded by a solid dielectric 21 and the shield 20 and the electrode 4 is electrically connected to the shield 20.
- FIG. 2 shows a spark gap component 11 within a shield 20, the space between the shield 20 and the component 11 being filled with a solid dielectric 21.
- the solid dielectric 21 is in particular an insulating plastic, for example a shrink tube.
- the spark gap component 11 consists of the tubular insulator 12, in which the two electrodes 13 and 14 are inserted. As in FIG. 1, the active surfaces 15 and 16 of the two electrodes are at a distance A. Each electrode is assigned a control electrode 17 or 18, which extends from the base part 19 of the respective electrode in the direction of the counterelectrode to the height of the active surface of the associated electrode extends. The shield 20 is not connected to any particular potential. - The control electrodes 17 and 18 consist of metal pieces of pipe that are soldered at one end to the foot of the respective electrode. The control electrodes can also have the shape of a cap, the cap expediently having a hole in its base in order to be able to make direct contact with the respective electrode.
- FIG. 4 shows a spark gap component 31, in which a control electrode 37 in the form of a band-shaped ring with a bandwidth of approximately 2 mm is arranged at the level of the active surface 35 of the potential-carrying electrode 33 on the outer circumferential surface of the insulator 32.
- This ring is electrically connected to the electrode 33.
- Its edge facing the counter electrode 34, which is electrically effective for the potential control, has the same height distance from the active surface of the electrode 33 a as the control electrodes according to Figures 1 and 2.
- FIG. 5 shows a control electrode 40, which essentially consists of a wire ring 41 with a diameter of approximately 0.5 to 1 mm, which is supported on a foot ring 43 via holding elements 42.
- This control electrode 40 can be placed with the base ring 43 on the base part of an electrode of a spark gap component and optionally soldered there.
Landscapes
- Spark Plugs (AREA)
Description
Die Erfindung liegt auf dem Gebiet der elektrischen Bauelemente und ist bei der konstruktiven Ausgestaltung eines Funkenstreckenbauelementes anzuwenden, das beim Betrieb innerhalb einer Abschirmung angeordnet ist, die das Funkenstreckenbauelement unter Zwischenschaltung eines festen Dielektrikums umgibt. Derartige Funkenstreckenbauelemente werden insbesondere in Kraftfahrzeugen als Vorfunkenstrecken für Zündkerzen eingesetzt.The invention is in the field of electrical components and is to be used in the structural design of a spark gap component which, during operation, is arranged within a shield which surrounds the spark gap component with the interposition of a solid dielectric. Such spark gap components are used in particular in motor vehicles as spark gaps for spark plugs.
Ein bekanntes Funkenstreckenbauelement besteht aus einem rohrförmigen Isolator und zwei Elektroden, wobei die eine Elektrode in das eine Ende und die andere Elektrode in das andere Ende des Isolators vakuumdicht eingesetzt ist. Im Betriebsfall führt die eine Elektrode das anstehende Potential, während die andere Elektrode erdnahes Potential hat. Die beiden Elektroden haben im übrigen eine im wesentlichen ebene aktive Oberfläche, wobei diese Oberflächen mit einer Schicht aus einem abbrandfesten Material versehen sind. Dieses bekannte Funkenstreckenbauelement ist zum Einbau in einen Zündkerzenstecker vorgesehen. Im eingebauten Zustand befindet sich das Bauelement in der Durchgangsbohrung eines Isolierkörpers, der von einer Metallabschirmung umhüllt ist. Die Zündspannung des Funkenstreckenbauelementes liegt bei etwa 8 bis 10 kV (DE-B-24 18 261).A known spark gap component consists of a tubular insulator and two electrodes, one electrode being inserted in a vacuum-tight manner in one end and the other electrode in the other end of the insulator. In operation, one electrode carries the potential, while the other electrode has potential close to the earth. The two electrodes also have an essentially planar active surface, these surfaces being provided with a layer of a material which is resistant to erosion. This known spark gap component is intended for installation in a spark plug connector. In the installed state, the component is located in the through hole of an insulating body which is covered by a metal shield. The ignition voltage of the spark gap component is approximately 8 to 10 kV (DE-B-24 18 261).
Für eine relativ niedrige Zündspannung von etwa 1,7 kV, jedoch einen Entladungsstrom von etwa 3000 A, ist weiterhin eine Funkenstrecke bekannt, deren kuppelartige Elektroden aus Niob bestehen, wobei der Kathode zur Stabilisierung der Zündspannung eine Steuerlelektrode zugeordnet ist. Diese Steuerelektrode besteht aus einem auf den Keramikisolator der Funkenstrecke aufgesetzten metallischen Zylinder, der sich von der Mitte des Zündspaltes bis zum Fußteil der Kathode erstreckt (US-A-4 475 055).For a relatively low ignition voltage of about 1.7 kV, but a discharge current of about 3000 A, is still a spark gap is known, the dome-like electrodes are made of niobium, a control electrode being assigned to the cathode to stabilize the ignition voltage. This control electrode consists of a metallic cylinder placed on the ceramic insulator of the spark gap, which extends from the center of the ignition gap to the base of the cathode (US Pat. No. 4,475,055).
Andere bekannte Funkenstreckenbauelemente sind auch für höhere Zündspannungen ausgelegt. Um bei Zündspannungen von 2 bis 16 kV u. a. eine Langzeitstabilität der Zündspannung zu gewährleisten, bestehen die aktiven Teile der Elektroden aus Titan, Zirkon und ähnlichen Metallen und das Bauelement ist mit einem Edelgas bei einem Druck von 0,8 bis 10 bar gefüllt (US-C-3 956 657). Zur weiteren Erhöhung der Zündspannung auf 18 kV ist bei einem anderen bekannten Funkenstreckenbauelement u.a. vorgesehen, an der Innenwand des Isolators im Bereich des Entladungsspaltes eine Zündhilfe anzubringen, wobei die Summe der Abstände der Zündhilfe von den verrundeten oder angefasten Elektrodenkanten größer ist als der etwa 0,5 mm betragende Elektrodenabstand. Das als Vorfunkenstrecke bezeichnete Bauelement ist im übrigen im wesentlichen mit Stickstoff bei einem Druck von etwa 15 bar gefüllt (EP-C-0 099 522).Other known spark gap components are also designed for higher ignition voltages. To at ignition voltages from 2 to 16 kV u. a. To ensure long-term stability of the ignition voltage, the active parts of the electrodes consist of titanium, zirconium and similar metals and the component is filled with an inert gas at a pressure of 0.8 to 10 bar (US-C-3 956 657). To further increase the ignition voltage to 18 kV, in another known spark gap component, i.a. provided to attach an ignition aid to the inner wall of the insulator in the region of the discharge gap, the sum of the distances of the ignition aid from the rounded or chamfered electrode edges being greater than the approximately 0.5 mm electrode distance. The component referred to as the spark gap is essentially filled with nitrogen at a pressure of approximately 15 bar (EP-C-0 099 522).
Beim Einsatz von Vorfunkenstrecken mit einer auf 15 bis 25 kV erhöhten Zündspannung hat sich gezeigt, daß die Zündspannung im geschirmten Zustand der Vorfunkenstrecke von der Zündspannung im ungeschirmten Zustand abweicht, insbesondere niedriger liegt. Ausgehend von einem Funkenstreckenbauelement mit den Merkmalen des Oberbegriffes des Patentanspruches 1 liegt der Erfindung daher die Aufgabe zugrunde, das Funkenstreckenbauelement so auszugestalten, daß die Zündspannung im wesentlichen unabhängig von einer späteren Schirmung des Bauelementes ist, insbesondere so auszugestalten, daß die Zündspannung im ungeschirmten Zustand von der Zündspannung im geschirmten Zustand nicht wesentlich unterschritten wird.When using spark gaps with an ignition voltage increased to 15 to 25 kV, it has been shown that the ignition voltage in the shielded state of the spark gap differs from the ignition voltage in the unshielded state, in particular is lower. Starting from a spark gap component with the features of the preamble of
Zur Lösung dieser Aufgabe ist gemäß der Erfindung vorgesehen, daß zum Zwecke der Potentialsteuerung an oder auf der äußeren Mantelfläche des Isolators in Höhe der aktiven Oberfläche der potentialführenden Elektrode eine ringförmige Steuerelektrode angeordnet ist, die mit der potentialführenden Elektrode elektrisch verbunden ist, wobei der Höhenabstand zwischen der Steuerelektrode und der aktiven Oberfläche der zugehörigen Elektrode höchstens 10 % des kleinsten Abstandes der aktiven Oberflächen beider Elektroden beträgt.To solve this problem it is provided according to the invention that for the purpose of potential control on or on the outer surface of the insulator at the level of the active surface of the potential-carrying electrode, an annular control electrode is arranged, which is electrically connected to the potential-carrying electrode, the height distance between the control electrode and the active surface of the associated electrode is at most 10% of the smallest distance between the active surfaces of the two electrodes.
Bezüglich der Verwendung einer Steuerelektrode berücksichtigt die Erfindung die Erkenntnis, daß bei zunehmend höheren Zündspannungen das elektrische Feld zwischen den beiden Elektroden des Funkenstreckenbauelementes durch eine umgebende Abschirmung derart beeinflußt wird, daß eine Erhöhung der Feldstärke an der umlaufenden Kante der aktiven Oberfläche der potentialführenden Elektrode auftritt. Dadurch wird die Zündspannung herabgesetzt. Durch Einsatz der erfindungsgemäßen Steuerelektrode wird dagegen das elektrische Feld derart beeinflußt, daß es im interessierenden Bereich im geschirmten oder ungeschirmten Zustand des Funkenstreckenbauelementes keine wesentlichen Unterschiede aufweist.With regard to the use of a control electrode, the invention takes into account the knowledge that, at increasingly higher ignition voltages, the electrical field between the two electrodes of the spark gap component is influenced by a surrounding shield such that an increase in the field strength occurs at the peripheral edge of the active surface of the potential-carrying electrode. This lowers the ignition voltage. By using the control electrode according to the invention, on the other hand, the electrical field is influenced in such a way that there are no significant differences in the area of interest in the shielded or unshielded state of the spark gap component.
Die Wirksamkeit der erfindungsgemäßen Potentialsteuerung hängt u.a. ab von dem Abstand, mit dem die Abschirmung das Funkenstreckenbauelement, und d.h. insbesondere die Elektroden, umgibt, und weiterhin davon, wieweit die Steuerelektrode bzw. die wirksame Kante der Steuerelektrode in Achsrichtung des Funkenstreckenbauelementes von der aktiven Oberfläche der potentialführenden Elektrode entfernt ist. Je geringer der Abstand der Abschirmung ist, um so genauer muß die Position der Steuerelektrode festgelegt sein.The effectiveness of the potential control according to the invention depends, inter alia, on the distance with which the shield surrounds the spark gap component, and in particular the electrodes, and also on how far the control electrode or the effective edge of the control electrode in the axial direction of the spark gap component is removed from the active surface of the potential-carrying electrode. The smaller the distance between the shields, the more precisely the position of the control electrode must be determined.
Die Steuerelektrode ist zweckmäßig metallisch auszubilden und kann beispielsweise aus einer galvanisch aufgebrachten Metallisierung oder einer aufgestrichenen Leitsilberschicht bestehen. Man kann aber auch einen Drahtring oder einen bandförmigen Ring mit einer Bandbreite von wenigstens 1 mm oder eine sich bis zum Fußteil der zugehörigen Elektrode erstreckende Metallkappe vorsehen, die beispielsweise mit der zugehörigen Elektrode verlötet ist.The control electrode is expediently of metallic design and can consist, for example, of a galvanically applied metallization or a coated conductive silver layer. However, it is also possible to provide a wire ring or a band-shaped ring with a bandwidth of at least 1 mm or a metal cap which extends to the base part of the associated electrode and is soldered to the associated electrode, for example.
Die Anordnung einer Steuerelektrode allein an der potentialführenden Elektrode ist vor allem dann sinnvoll, wenn die Abschirmung fest auf Erdpotential liegt. Bei floatendem Potential für die Abschirmung ist es notwendig, beiden Elektroden eine Steuerelektrode zuzuordnen. Dies ist aber auch bei geerdeter Abschirmung möglich.The arrangement of a control electrode only on the potential-carrying electrode is particularly useful when the shield is firmly connected to earth potential. If the potential for the shield is floating, it is necessary to assign a control electrode to both electrodes. However, this is also possible when the shield is grounded.
Vier Ausführungsbeispiele des neuen Funkenstreckenbauelementes sind in den Figuren 1 bis 5 dargestellt. Dabei zeigt
- Fig. 1 ein Funkenstreckenbauelement, bei dem allein der potentialführenden Elektrode eine Steuerelektrode zugeordnet ist,
- Fig. 2 ein Funkenstreckenbauelement, das innerhalb einer Abschirmung mit floatendem Potential angeordnet ist und bei dem demzufolge beiden Elektroden eine Steuerelektrode zugeordnet ist,
- Fig. 3 ein Funkenstreckenbauelement gemäß
Figur 1 mit zugeordneter Abschirmung, - Fig. 4 ein Funkenstreckenbauelement mit einer Steuerelektrode in Form eines bandförmigen Ringes und
- Fig. 5 eine Steuerelektrode in Form eines Drahtringes.
- 1 shows a spark gap component in which only the control electrode is assigned a control electrode,
- 2 shows a spark gap component which is arranged within a shield with a floating potential and in which consequently a control electrode is assigned to both electrodes,
- 3 shows a spark gap component according to FIG. 1 with an associated shield,
- Fig. 4 is a spark gap component with a control electrode in the form of a band-shaped ring and
- Fig. 5 shows a control electrode in the form of a wire ring.
Fig. 1 zeigt ein Funkenstreckenbauelement 1, das im wesentlichen aus dem rohrförmigen Glas- oder Keramikisolator 2 und den beiden Elektroden 3 und 4 besteht, wobei die Elektroden aktive Oberflächen 5 bzw. 6 aufweisen. Die aktiven Oberflächen haben voneinander einen Abstand A von etwa 6 mm.1 shows a
Mit der Elektrode 3 elektrisch verbunden ist eine zylindrische Steuerelektrode 7, die sich vom Fußteil 9 der Elektrode 3 entlang der äußeren Mantelfläche des Isolators 2 in Richtung auf die Gegenelektrode 4 bis zur Höhe der aktiven Oberfläche 5 der Elektrode 3 erstreckt. Die Steuerelektrode endet in einem Höhenabstand a von der aktiven Oberfläche der Elektrode 3. Dieser Abstand a ist kleiner als 10 % des Abstandes A und beträgt etwa 0,5 mm. - Die Steuerelektrode 7 besteht aus einer aufgebrachten Metallisierung einem Metall-Silikat-Gemisch.A
Bei Einbau des Funkenstreckenbauelementes gemäß Figur 1 in eine geerdete Abschirmung ist darauf zu achten, daß die Elektrode 3 die potentialführende Elektrode ist und die Elektrode 4 direkt oder über einen Widerstand mit der Abschirmung verbunden ist. Ein Ausführungsbeispiel hierfür zeigt Figur 3, wobei das Funkenstreckenbauelement 1 von einem festen Dielektrikum 21 und der Abschirmung 20 umgeben und die Elektrode 4 mit der Abschirmung 20 elektrisch verbunden ist.When installing the spark gap component according to FIG. 1 in a grounded shield, care must be taken that the electrode 3 is the potential-carrying electrode and the
Figur 2 zeigt ein Funkenstreckenbauelement 11 innerhalb einer Abschirmung 20, wobei der Raum zwischen der Abschirmung 20 und dem Bauelement 11 mit einem festen Dielektrikum 21 ausgefüllt ist. Bei dem festen Dielektrikum 21 handelt es sich insbesondere um einen isolierenden Kunststoff, beispielsweise einen Schrumpfschlauch.FIG. 2 shows a
Das Funkenstreckenbauelement 11 besteht aus dem rohrförmigen Isolator 12, in den die beiden Elektroden 13 und 14 eingesetzt sind. Die aktiven Oberflächen 15 und 16 der beiden Elektroden haben wie in Fig. 1 einen Abstand A. Jeder Elektrode ist eine Steuerelektrode 17 bzw. 18 zugeordnet, die sich vom Fußteil 19 der jeweiligen Elektrode in Richtung auf die Gegenelektrode bis zur Höhe der aktiven Oberfläche der zugehörigen Elektrode erstreckt. Die Abschirmung 20 ist mit keinem bestimmten Potential verbunden. - Die Steuerelektroden 17 und 18 bestehen aus metallenen Rohrstücken, die an ihrem einen Ende mit dem Fuß der jeweiligen Elektrode verlötet sind. Die Steuerelektroden können auch die Form einer Kappe haben, wobei die Kappe in ihrem Boden zweckmäßig ein Loch aufweist, um die jeweilige Elektrode direkt kontaktieren zu können.The
Figur 4 zeigt ein Funkenstreckenbauelement 31, bei dem in Höhe der aktiven Oberfläche 35 der potentialführenden Elektrode 33 auf der äußeren Mantelfläche des Isolators 32 eine Steuerelektrode 37 in Form eines bandförmigen Ringes mit einer Bandbreite von etwa 2 mm angeordnet ist. Dieser Ring ist mit der Elektrode 33 elektrisch verbunden. Seine der Gegenelektrode 34 zugewandte, für die Potentialsteuerung elektrisch wirksame Kante hat von der aktiven Oberfläche der Elektrode 33 den gleichen Höhenabstand a wie die Steuerelektroden gemäß den Figuren 1 und 2.FIG. 4 shows a
Figur 5 zeigt eine Steuerelektrode 40, die im wesentlichen aus einem Drahtring 41 mit einem Durchmesser von etwa 0,5 bis 1 mm besteht, der sich über Haltelemente 42 auf einem Fußring 43 abstützt. Diese Steuerelektrode 40 kann mit dem Fußring 43 auf das Fußteil einer Elektrode eines Funkenstreckenbauelementes aufgesetzt und dort gegebenenfalls verlötet werden.FIG. 5 shows a
Claims (6)
- Spark gap component, for arrangement within a shield surrounding the spark gap component with the interposition of a fixed dielectric, comprised by a tubular insulator and two electrodes having a substantially flat active surface, wherein the potential-conducting electrode is inserted in one end and the opposing electrode is inserted in the other end of the insulator, characterised in that, for controlling potential, an annular control electrode (7) is arranged on or in the outer casing surface of the insulator (2) at the level of the active surface (5) of the potential-conducting electrode (3), which control electrode (7) is electrically connected to the potential-conducting electrode (3), wherein the height interval between the control electrode (7) and the active surface (5) of the associated electrode (3) amounts to 10% at most of the least distance between the active surfaces (5, 6) of the two electrodes (3, 4).
- Spark gap component according to claim 1, characterised in that an annular control electrode (18) is also assigned to the opposing electrode (14).
- Spark gap component according to one of claims 1 to 2, characterised in that the control electrode comprises a band-shaped ring (37) having a width of band of at least 1 mm.
- Spark gap component according to claim 3, characterised in that the control electrode extends as far as the foot part (8) (sic) of the associated electrode (3).
- Spark gap component according to one of claims 1 to 4, characterised in that the control electrode (7) is comprised by a metal layer.
- Spark gap component according to one of claims 1 to 4, characterised in that the control electrode (7) is comprised by a metal cap.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP89730009A EP0378963B1 (en) | 1989-01-18 | 1989-01-18 | Spark gap element for shielded mounting |
| DE58907951T DE58907951D1 (en) | 1989-01-18 | 1989-01-18 | Spark gap component for shielded arrangement. |
| JP2006980A JP2911156B2 (en) | 1989-01-18 | 1990-01-16 | Spark gap device |
| US07/467,031 US5142194A (en) | 1989-01-18 | 1990-01-18 | Spark gap component of particular spacing mounted within a shield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP89730009A EP0378963B1 (en) | 1989-01-18 | 1989-01-18 | Spark gap element for shielded mounting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0378963A1 EP0378963A1 (en) | 1990-07-25 |
| EP0378963B1 true EP0378963B1 (en) | 1994-06-22 |
Family
ID=8203105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89730009A Expired - Lifetime EP0378963B1 (en) | 1989-01-18 | 1989-01-18 | Spark gap element for shielded mounting |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5142194A (en) |
| EP (1) | EP0378963B1 (en) |
| JP (1) | JP2911156B2 (en) |
| DE (1) | DE58907951D1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5080083A (en) * | 1989-07-12 | 1992-01-14 | Yazaki Corporation | Discharge device and ignition system with series gap using discharge device |
| DE4033927A1 (en) * | 1990-10-25 | 1992-04-30 | Hoechst Ceram Tec Ag | SURGE ARRESTERS |
| JPH06196249A (en) * | 1992-01-17 | 1994-07-15 | Kaname Iketani | Double ignition type spark plug @(3754/24)one-circuit system) for internal combustion engine using gasoline as fuel and electric spark generator |
| US5739637A (en) * | 1995-09-28 | 1998-04-14 | Sandia Corporation | Cold cathode vacuum discharge tube |
| US6037715A (en) * | 1997-11-19 | 2000-03-14 | Maxwell Technologies Systems Division, Inc. | Spark switch having coaxial electrodes with increased electrode surface area exposure |
| DE19928322A1 (en) | 1999-06-16 | 2000-12-21 | Siemens Ag | Gas-filled surge arrester with electrode connections in the form of band-like clamps |
| FR2816769B1 (en) * | 2000-11-16 | 2004-12-24 | France Etat Armement | EXPLODER FOR HIGH POWER ELECTRIC GENERATOR |
| DE10151565B4 (en) * | 2001-10-23 | 2004-09-30 | Diehl Munitionssysteme Gmbh & Co. Kg | microwave generator |
| US6916374B2 (en) * | 2002-10-08 | 2005-07-12 | Micron Technology, Inc. | Atomic layer deposition methods and atomic layer deposition tools |
| DE102005016848A1 (en) * | 2005-04-12 | 2006-10-19 | Epcos Ag | Surge arresters |
| DE102005036265A1 (en) | 2005-08-02 | 2007-02-08 | Epcos Ag | radio link |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3989973A (en) * | 1971-01-02 | 1976-11-02 | Siemens Aktiengesellschaft | Cold-cathode gas-discharge device |
| US3956657A (en) * | 1972-07-18 | 1976-05-11 | Robert Bosch G.M.B.H. | Pre-ignition gap |
| US3825789A (en) * | 1973-06-29 | 1974-07-23 | Gen Electric | Vacuum arc devices with hard, ductile, ferrous electrodes |
| DE2418261B2 (en) * | 1974-04-16 | 1976-05-13 | Siemens AG, 1000 Berlin und 8000 München | SPARK GAP COMPONENT FOR IGNITION SYSTEMS IN COMBUSTION MACHINES |
| US4475055A (en) * | 1982-01-28 | 1984-10-02 | The United States Of America As Represented By The United States Department Of Energy | Spark gap device for precise switching |
| DE3227668A1 (en) * | 1982-07-23 | 1984-01-26 | Siemens AG, 1000 Berlin und 8000 München | SPARK RANGE WITH A GAS FILLED HOUSING |
| JPS607183U (en) * | 1983-06-25 | 1985-01-18 | 株式会社サンコ−シャ | Overvoltage protection element |
| US4631453A (en) * | 1983-08-29 | 1986-12-23 | Joslyn Mfg. And Supply Co. | Triggerable ceramic gas tube voltage breakdown device |
| DE3763733D1 (en) * | 1986-04-22 | 1990-08-23 | Siemens Ag | SURGE ARRESTERS. |
-
1989
- 1989-01-18 DE DE58907951T patent/DE58907951D1/en not_active Expired - Fee Related
- 1989-01-18 EP EP89730009A patent/EP0378963B1/en not_active Expired - Lifetime
-
1990
- 1990-01-16 JP JP2006980A patent/JP2911156B2/en not_active Expired - Fee Related
- 1990-01-18 US US07/467,031 patent/US5142194A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0378963A1 (en) | 1990-07-25 |
| JP2911156B2 (en) | 1999-06-23 |
| US5142194A (en) | 1992-08-25 |
| JPH02236984A (en) | 1990-09-19 |
| DE58907951D1 (en) | 1994-07-28 |
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