US3845344A - Ignition apparatus for a plasma burner - Google Patents

Ignition apparatus for a plasma burner Download PDF

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Publication number
US3845344A
US3845344A US00395412A US39541273A US3845344A US 3845344 A US3845344 A US 3845344A US 00395412 A US00395412 A US 00395412A US 39541273 A US39541273 A US 39541273A US 3845344 A US3845344 A US 3845344A
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US
United States
Prior art keywords
chamber
electrode
gas
plasma
elongated
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
US00395412A
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English (en)
Inventor
R Rainer
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.)
Gebrueder Boehler and Co AG
Original Assignee
Gebrueder Boehler and Co 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 Gebrueder Boehler and Co AG filed Critical Gebrueder Boehler and Co AG
Application granted granted Critical
Publication of US3845344A publication Critical patent/US3845344A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/30—Plasma torches using applied electromagnetic fields, e.g. high frequency or microwave energy
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/36—Circuit arrangements

Definitions

  • Argon or other plasma-forming gas is subjected to an electromagnetic field in an elongated ionization chamber.
  • the resulting ionized gas passes through a working gap formed between an output nozzle of the conductive chamber and an elongated electrode mounted axially in the chamber.
  • a remotely located switch is operative to complete an electrical path to ground through the gap and the electrode, thereby igniting the ionized gas.
  • an elongated electrode extends downwardly through the elongated ionization chamber of the burner in insulating relation with the chamber walls.
  • the lowermost tip of the electrode terminates within the chamber adjacent the output nozzle to define a working gap therebetween.
  • a high-speed switch is operative to ground the electrode to complete the ignition effecting electrical path through the working gap.
  • a manual actuator for the switch may be conveniently located remote from the interface between the burner and the workpiece.
  • FIG. I is a pictorial diagram illustrating, in an overall arrangement for applying a cold plasma flame to a grounded workpiece, a flame ignition circuit in accordance with the invention.
  • FIG. 2 is an elevational view in section of a plasma burner useful in the arrangement of FIG. 1, showing certain details of the ignition facilities in the burner.
  • the surface layer (designated 20) of the workpiece to be hardened is exposed to said flaming stream of cold plasma (as for example described in copending and coassigned application Ser. No. [82,420, filed Sept. 2
  • a surface layer is formed by rapid heating and cooling.
  • further energy such as a mechanical shock converts such layer into a very hard and tough martensite layer.
  • the burner I employed for this purpose includes an electrically conductive elongated chamber l8 which converges at its lower end in the nozzle 2.
  • a plasmaforming gas such as argon is introduced into a gas port 3 near the upper end of the chamber from a suitable gas supply 13.
  • Such gas may be ionized into a cold plasma within the chamber by high frequency electromagnetic energy coupled to the chamber from a suitable generator 12 via an input connection 6.
  • the generator 12 is selectively excitable from a power supply 15 by means of a manually operated switch II.
  • an electric path to ground is established through the gas to commence an are.
  • such path is provided for in a safe and accessible manner by suitably mounting and selectively grounding an elongated electrode 5 within the chamber l8 in insulating relation with the chamber walls.
  • the electrode 5 extends downwardly into the chamber 18 through a central bore 21 of an insulating sleeve 4.
  • the sleeve is disposed coaxially within the chamber 18.
  • a lower end 22 of the electrode 5 extends beyond the lower end of the bore 21 and terminates adjacent the nozzle 2 to define a working gap 23 within the chamber.
  • An upper end 19 ofthe electrode 5 is disposed in communication with a grounding switch 9 through a coupling 7 and an ignition cable 8.
  • the switch 9 includes a contact assembly 9A interconnecting the ignition cable 8 to ground.
  • the assembly 9A is operable when a coil 9B of the switch is excited.
  • Such excitation is accomplished by coupling a suitable voltage source across the coil 98 via a manual switch 10 (e.g., a push button.) Depression of the push button 10 is effective to ignite the ionized gas in the chamber 18 by grounding the electrode 5 and thereby completing an electric path to ground through the gas via the working gap 23 (FIG. 2).
  • the ignition arrangement just described is highly advantageous in that it eliminates the danger of electric shock on burns to the operator, who in previous arrangements had to manually insert a metallic pin into the nozzle to start the arc. Moreover, the described arrangement is convenient in that the only part of such arrangement requiring manual attention by the opera tor is the push button 10, which of course can be located in an accessible location remote from the nozzle workpiece interface.
  • the electrode 5 is illustratively made of Tungsten, although it may also consist of any of the material having high temperature stability and good electron emission characteristics.
  • the switch 9 may be as a highfrequency circuit breaker or other high-speed device.
  • a plasma burner apparatus including an elongated, electrically conductive chamber for ionizing a plasmaforming gas by subjecting the gas to an electromagnetic field and for igniting the ionized gas by completing an electrical path to ground through the ionized gas via an output nozzle at the lower end of the chaml0 ber, an improved arrangement for igniting the ionized gas, which comprises:
  • an elongated electrode extending longitudinally downward through the chamber in spaced relation tending beyond the lower end of the bore.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electromagnetism (AREA)
  • Plasma Technology (AREA)
  • Arc Welding Control (AREA)
  • Discharge Heating (AREA)
US00395412A 1972-09-08 1973-09-10 Ignition apparatus for a plasma burner Expired - Lifetime US3845344A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT770072A AT318768B (de) 1972-09-08 1972-09-08 Verfahren und Vorrichtung zum Zünden eines Hochfrequenzplasmabrenners

Publications (1)

Publication Number Publication Date
US3845344A true US3845344A (en) 1974-10-29

Family

ID=3598648

Family Applications (1)

Application Number Title Priority Date Filing Date
US00395412A Expired - Lifetime US3845344A (en) 1972-09-08 1973-09-10 Ignition apparatus for a plasma burner

Country Status (16)

Country Link
US (1) US3845344A (de)
JP (1) JPS4991936A (de)
AT (1) AT318768B (de)
BE (1) BE804490A (de)
CA (1) CA1008137A (de)
CH (1) CH567864A5 (de)
DD (1) DD108883A5 (de)
DE (1) DE2337416A1 (de)
ES (1) ES418562A1 (de)
FR (1) FR2199244B1 (de)
GB (1) GB1435138A (de)
IT (1) IT1008549B (de)
NL (1) NL7311953A (de)
NO (1) NO136557C (de)
SE (1) SE387037B (de)
ZA (1) ZA735584B (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4728862A (en) * 1982-06-08 1988-03-01 The United States Of America As Represented By The United States Department Of Energy A method for achieving ignition of a low voltage gas discharge device
EP0335448A1 (de) * 1988-03-28 1989-10-04 Koninklijke Philips Electronics N.V. Plasmabrenner
CN102679395A (zh) * 2012-05-29 2012-09-19 哈尔滨工程大学 顺流压差式等离子点火喷嘴
US20140190958A1 (en) * 2011-08-08 2014-07-10 Siemens Aktiengesellschaft Method for coating an insulation component and insulation component
CN107100740A (zh) * 2017-05-10 2017-08-29 哈尔滨工程大学 气流压缩定向聚能等离子弧点火喷嘴
US11273491B2 (en) 2018-06-19 2022-03-15 6K Inc. Process for producing spheroidized powder from feedstock materials
US20220095445A1 (en) * 2020-09-24 2022-03-24 6K Inc. Systems, devices, and methods for starting plasma
US11311938B2 (en) 2019-04-30 2022-04-26 6K Inc. Mechanically alloyed powder feedstock
US11577314B2 (en) 2015-12-16 2023-02-14 6K Inc. Spheroidal titanium metallic powders with custom microstructures
US11590568B2 (en) 2019-12-19 2023-02-28 6K Inc. Process for producing spheroidized powder from feedstock materials
US11611130B2 (en) 2019-04-30 2023-03-21 6K Inc. Lithium lanthanum zirconium oxide (LLZO) powder
US11717886B2 (en) 2019-11-18 2023-08-08 6K Inc. Unique feedstocks for spherical powders and methods of manufacturing
US11839919B2 (en) 2015-12-16 2023-12-12 6K Inc. Spheroidal dehydrogenated metals and metal alloy particles
US11855278B2 (en) 2020-06-25 2023-12-26 6K, Inc. Microcomposite alloy structure
US11919071B2 (en) 2020-10-30 2024-03-05 6K Inc. Systems and methods for synthesis of spheroidized metal powders

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO141183C (no) * 1977-12-06 1980-01-23 Sintef Plasmabrenner.
DD151249A1 (de) * 1979-12-18 1981-10-08 Armin Gruenler Duese fuer ein hochstromplasmatron
FR2860123B1 (fr) * 2003-09-19 2005-11-11 Cit Alcatel Torche a plasma thermique inductif

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192427A (en) * 1961-06-19 1965-06-29 Hitachi Ltd Plasma flame generator
US3353061A (en) * 1967-04-10 1967-11-14 Kenneth D Davis High temperature plasma generator having means for providing current flow through plasma discharge
US3501675A (en) * 1966-10-12 1970-03-17 British Titan Products Initiation process

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192427A (en) * 1961-06-19 1965-06-29 Hitachi Ltd Plasma flame generator
US3501675A (en) * 1966-10-12 1970-03-17 British Titan Products Initiation process
US3353061A (en) * 1967-04-10 1967-11-14 Kenneth D Davis High temperature plasma generator having means for providing current flow through plasma discharge

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4728862A (en) * 1982-06-08 1988-03-01 The United States Of America As Represented By The United States Department Of Energy A method for achieving ignition of a low voltage gas discharge device
EP0335448A1 (de) * 1988-03-28 1989-10-04 Koninklijke Philips Electronics N.V. Plasmabrenner
US20140190958A1 (en) * 2011-08-08 2014-07-10 Siemens Aktiengesellschaft Method for coating an insulation component and insulation component
CN102679395A (zh) * 2012-05-29 2012-09-19 哈尔滨工程大学 顺流压差式等离子点火喷嘴
US11839919B2 (en) 2015-12-16 2023-12-12 6K Inc. Spheroidal dehydrogenated metals and metal alloy particles
US11577314B2 (en) 2015-12-16 2023-02-14 6K Inc. Spheroidal titanium metallic powders with custom microstructures
CN107100740A (zh) * 2017-05-10 2017-08-29 哈尔滨工程大学 气流压缩定向聚能等离子弧点火喷嘴
US11471941B2 (en) 2018-06-19 2022-10-18 6K Inc. Process for producing spheroidized powder from feedstock materials
US11465201B2 (en) 2018-06-19 2022-10-11 6K Inc. Process for producing spheroidized powder from feedstock materials
US11273491B2 (en) 2018-06-19 2022-03-15 6K Inc. Process for producing spheroidized powder from feedstock materials
US11311938B2 (en) 2019-04-30 2022-04-26 6K Inc. Mechanically alloyed powder feedstock
US11611130B2 (en) 2019-04-30 2023-03-21 6K Inc. Lithium lanthanum zirconium oxide (LLZO) powder
US11633785B2 (en) 2019-04-30 2023-04-25 6K Inc. Mechanically alloyed powder feedstock
US11717886B2 (en) 2019-11-18 2023-08-08 6K Inc. Unique feedstocks for spherical powders and methods of manufacturing
US11590568B2 (en) 2019-12-19 2023-02-28 6K Inc. Process for producing spheroidized powder from feedstock materials
US11855278B2 (en) 2020-06-25 2023-12-26 6K, Inc. Microcomposite alloy structure
WO2022067303A1 (en) * 2020-09-24 2022-03-31 6K Inc. Systems, devices, and methods for starting plasma
US20220095445A1 (en) * 2020-09-24 2022-03-24 6K Inc. Systems, devices, and methods for starting plasma
US11963287B2 (en) * 2020-09-24 2024-04-16 6K Inc. Systems, devices, and methods for starting plasma
US11919071B2 (en) 2020-10-30 2024-03-05 6K Inc. Systems and methods for synthesis of spheroidized metal powders

Also Published As

Publication number Publication date
FR2199244B1 (de) 1978-11-10
NO136557C (no) 1977-09-21
JPS4991936A (de) 1974-09-03
NO136557B (de) 1977-06-13
IT1008549B (it) 1976-11-30
DE2337416A1 (de) 1974-03-14
AT318768B (de) 1974-11-11
SE387037B (sv) 1976-08-23
ES418562A1 (es) 1976-04-01
GB1435138A (en) 1976-05-12
NL7311953A (de) 1974-03-12
BE804490A (fr) 1974-01-02
FR2199244A1 (de) 1974-04-05
DD108883A5 (de) 1974-10-05
CA1008137A (en) 1977-04-05
ZA735584B (en) 1974-07-31
CH567864A5 (de) 1975-10-15

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