EP0273165B1 - Méthode de fabrication d'une électrode corona, ainsi qu'une électrode fabriquée selon cette méthode - Google Patents

Méthode de fabrication d'une électrode corona, ainsi qu'une électrode fabriquée selon cette méthode Download PDF

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Publication number
EP0273165B1
EP0273165B1 EP87116693A EP87116693A EP0273165B1 EP 0273165 B1 EP0273165 B1 EP 0273165B1 EP 87116693 A EP87116693 A EP 87116693A EP 87116693 A EP87116693 A EP 87116693A EP 0273165 B1 EP0273165 B1 EP 0273165B1
Authority
EP
European Patent Office
Prior art keywords
core
electrode
corona
corona electrode
dielectric
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
Application number
EP87116693A
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German (de)
English (en)
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EP0273165A2 (fr
EP0273165A3 (en
Inventor
Klaus Kalwar
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Individual
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Individual
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
Priority claimed from DE19863640966 external-priority patent/DE3640966A1/de
Priority claimed from DE19868632118 external-priority patent/DE8632118U1/de
Application filed by Individual filed Critical Individual
Publication of EP0273165A2 publication Critical patent/EP0273165A2/fr
Publication of EP0273165A3 publication Critical patent/EP0273165A3/de
Application granted granted Critical
Publication of EP0273165B1 publication Critical patent/EP0273165B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01T19/00—Devices providing for corona discharge

Definitions

  • the present invention relates to a corona electrode consisting of an at least partially electrically conductive core which has a dielectric coating.
  • a corona electrode of the generic type is known from US-A-42 27 234.
  • copper is mentioned as the electrically conductive core material, for example.
  • Other suitable metals are also mentioned.
  • the present invention has for its object to provide a corona electrode which can be operated by a high-frequency generator operating with alternating voltage and which is characterized by low susceptibility to wear and high efficiency.
  • This object is achieved according to the invention in that the core consists of malleable graphite and is coated with a predominantly non-oxidic material, preferably non-oxidic ceramic, which forms the dielectric coating and has a minimum density of 95% of the theoretical density.
  • Such a corona electrode is characterized by the fact that even with a very thin coating of the core and with permanent point stress with a high-frequency high voltage for several hours, a puncture-proof insulation is also possible because the so-called corona ignition voltage is very low, with which a very good efficiency is achieved.
  • the reference numeral 1 designates a high-voltage generator which, during operation, can output a high-frequency high voltage to a corona electrode shown in FIGS. 2 to 5 via its connections 2 and 3.
  • the corona electrode shown in FIG. 2 is provided overall with the reference number 4.
  • This corona electrode 4 consists of a core 5 and a dielectric 6 in the form of a coating of the core 5.
  • the core 5 preferably consists of a moldable core material which is highly thermally conductive and has almost the same coefficient of thermal expansion as the material of the coating.
  • the core 5 preferably consists of graphite.
  • the dielectric 6 consists predominantly of non-oxide material, preferably of a ceramic material such as boron nitride, silicon nitride or aluminum nitride, and a mixture of the aforementioned materials is also conceivable. However, a mixture of ceramic materials made of non-oxidic and oxidic components is also conceivable.
  • the core 5 is preferably coated with a minimum density of 95% of the theoretical density.
  • the core 5 can be coated both in the PVD process (physical vapor deposition) and in the CVD process (chemical vapor deposition).
  • Coating of the core 5 by the plasma spraying method is also possible.
  • boron nitride is used for the coating, it is advantageous to use boron nitride in hexagonal, anisotropic form.
  • the dielectric 6 of the corona electrode 4 consists overall of a relatively thin layer made of the materials mentioned above.
  • Fig. 2 clearly shows that the corona electrode 4 on the Point for the electrical contact cable is not provided with a dielectric 6, so that there is the possibility of being able to join a plurality of corona electrodes 4 designed in this way in a short-circuit-proof manner.
  • Fig. 3 makes it clear that a thin coating of the electrode core 5 with the dielectric 6 already mentioned makes it possible to design the discharge webs 11 extremely sharp-edged and thus increasing efficiency.
  • the corona discharge 10 takes place here against a metal plate 12 which is connected to ground.
  • the core 5 of the corona electrode 4 is provided with a cooling bore 13 running in the direction of its longitudinal axis, the reveal of which is in turn coated with a dielectric 6.
  • the corona electrode 4 shown in FIG. 4 has a hollow core 5 which is completely and externally partially coated with a dielectric 6 in its interior.
  • This corona electrode 4 can be vented in the same direction in which the corona discharge 10 occurs.
  • the venting direction is indicated by arrow A in FIG. 4.
  • FIG. 5 shows a corona electrode 4, in which an internal electrode gap, angled through 90 °, is coated with a thin dielectric 6.
  • a metal wire 15 is exposed to a corona discharge 10.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Lasers (AREA)
  • Inorganic Insulating Materials (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Electroluminescent Light Sources (AREA)

Claims (2)

  1. Electrode à effet corona, composée d'un noyau (5) au moins partiellement conducteur de l'électricité, présentant un revêtement diélectrique (6), caractérisée en ce que le noyau (5) est constitué en graphite déformable plastiquement et est recouvert d'un materiau formant le revêtement diélectrique (6), principalement inoxydable, de préférence de céramique inoxydable d'une densité minimum de 95 % par rapport à la densité théorique.
  2. Electrode à effet corona selon la revendication 1, caractérisée en ce que le noyau (5) en graphite est une pièce fabriquée à la presse.
EP87116693A 1986-11-29 1987-11-12 Méthode de fabrication d'une électrode corona, ainsi qu'une électrode fabriquée selon cette méthode Expired - Lifetime EP0273165B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19863640966 DE3640966A1 (de) 1986-11-29 1986-11-29 Verfahren zur herstellung einer koronaelektrode
DE8632118U 1986-11-29
DE3640966 1986-11-29
DE19868632118 DE8632118U1 (fr) 1986-11-29 1986-11-29

Publications (3)

Publication Number Publication Date
EP0273165A2 EP0273165A2 (fr) 1988-07-06
EP0273165A3 EP0273165A3 (en) 1988-07-20
EP0273165B1 true EP0273165B1 (fr) 1992-10-07

Family

ID=25849894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116693A Expired - Lifetime EP0273165B1 (fr) 1986-11-29 1987-11-12 Méthode de fabrication d'une électrode corona, ainsi qu'une électrode fabriquée selon cette méthode

Country Status (4)

Country Link
US (1) US4841409A (fr)
EP (1) EP0273165B1 (fr)
DE (1) DE3782152D1 (fr)
ES (1) ES2035015T3 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5447763A (en) * 1990-08-17 1995-09-05 Ion Systems, Inc. Silicon ion emitter electrodes
US5257073A (en) * 1992-07-01 1993-10-26 Xerox Corporation Corona generating device
US5401368A (en) * 1993-04-23 1995-03-28 Praxair S.T. Technology, Inc. Fluid-cooled hollow copper electrodes and their use in corona or ozone applications
US6309610B1 (en) 1998-05-27 2001-10-30 Science Applications International Corporation Non-thermal plasma apparatus utilizing dielectrically-coated electrodes for treating effluent gas
WO2010081153A2 (fr) 2009-01-12 2010-07-15 Federal-Mogul Ignition Company Système allumeur pour l'allumage de carburant
CN102109116B (zh) * 2010-12-27 2016-06-22 秦彪 Led光模组和led芯片
US9004969B2 (en) 2011-10-24 2015-04-14 Federal-Mogul Ignition Company Spark plug electrode and spark plug manufacturing method
EP2866318A1 (fr) * 2013-10-24 2015-04-29 OCE-Technologies B.V. Électrode pour traitement de décharge à barrière diélectrique d'un substrat
US10879677B2 (en) * 2018-01-04 2020-12-29 Tenneco Inc. Shaped collet for electrical stress grading in corona ignition systems
CN112673598A (zh) 2018-06-18 2021-04-16 R·阿加沃尔 一种用于信号传输和接收的方法和系统

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Publication number Priority date Publication date Assignee Title
US2843646A (en) * 1953-06-09 1958-07-15 Union Carbide Corp Laminated metal ceramic
US3163753A (en) * 1961-09-12 1964-12-29 Du Pont Process and apparatus for electrostatically applying separating and forwarding forces to a moving stream of discrete elements of dielectric material
JPS5333852A (en) * 1976-08-31 1978-03-30 Sato Zoki Co Ltd Straw treating device in combine
US4110614A (en) * 1976-12-17 1978-08-29 Xerox Corporation Corona device
US4145386A (en) * 1977-06-29 1979-03-20 Union Carbide Corporation Method for the surface treatment of thermoplastic materials
JPS5947845B2 (ja) * 1977-07-26 1984-11-21 シャープ株式会社 透明導電膜製造方法
US4227234A (en) * 1978-07-03 1980-10-07 Xerox Corporation Corona charging element
JPS56165165A (en) * 1980-05-02 1981-12-18 Canon Inc Charger
JPS58215743A (ja) * 1982-06-09 1983-12-15 Hitachi Ltd 接触型記録媒体
JPS59176054A (ja) * 1983-03-25 1984-10-05 Matsushita Electric Ind Co Ltd インクジェット記録装置
US4564759A (en) * 1983-09-26 1986-01-14 Ensign-Bickford Industries, Inc. Corona discharge device
JPS61132966A (ja) * 1984-12-01 1986-06-20 Kobe Steel Ltd 電子写真用アルミナ被覆コロナワイヤ
US4696778A (en) * 1986-01-31 1987-09-29 Gte Laboratories Incorporated Process for sintering silicon nitride articles

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Band 10, Nr. 327 (P-513), 07.11.86, & JP-A-61 132 966 (KOBE STEEL) *
Patent Abstracts of Japan, Band 3, Nr. 47 (E-105), 20.04.79, & JP-A-54 025 493 (SHARP) *
Patent Abstracts of Japan, Band 8, Nr. 68 (P-264), 30.03.84 & JP-A-58 215 743 (HITACHI) *
Patent Abstracts of Japan, Band 9, Nr. 34 (M-357), 14.02.85, & JP-A-59 176 054 (MATSUSHITA) *

Also Published As

Publication number Publication date
DE3782152D1 (de) 1992-11-12
ES2035015T3 (es) 1993-04-16
EP0273165A2 (fr) 1988-07-06
EP0273165A3 (en) 1988-07-20
US4841409A (en) 1989-06-20

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