US1781330A - Ignition device for mercury-arc rectifiers - Google Patents

Ignition device for mercury-arc rectifiers Download PDF

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Publication number
US1781330A
US1781330A US348029A US34802929A US1781330A US 1781330 A US1781330 A US 1781330A US 348029 A US348029 A US 348029A US 34802929 A US34802929 A US 34802929A US 1781330 A US1781330 A US 1781330A
Authority
US
United States
Prior art keywords
mercury
nozzle
cathode
ignition
ignition device
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
US348029A
Other languages
English (en)
Inventor
Jonas Julius
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.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
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 Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US1781330A publication Critical patent/US1781330A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J13/00—Discharge tubes with liquid-pool cathodes, e.g. metal-vapour rectifying tubes
    • H01J13/02—Details
    • H01J13/48—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0072—Disassembly or repair of discharge tubes
    • H01J2893/0073—Discharge tubes with liquid poolcathodes; constructional details
    • H01J2893/0074—Cathodic cups; Screens; Reflectors; Filters; Windows; Protection against mercury deposition; Returning condensed electrode material to the cathodic cup; Liquid electrode level control
    • H01J2893/0087—Igniting means; Cathode spot maintaining or extinguishing means

Definitions

  • the invention concerns the ignition device for mercury arc rectifier-s in metal or glass containers by which the temporary electrical connection, necessary for the striking of the are between the ignition anode and the mercury cathode, is made and broken by means of a compressing piston.
  • a device of this type already known makes use, for glass rectifiers for example, of a centrally bored piston floating on the mercury in the tubular shaped cathode container. The piston is caused to force a jet of mercury against the anode by being drawn into the mercury forming the cathode through the influence of an electro- 5 magnet.
  • the described disadvantages are avoided by so arranging the nozzle formation at the pipe end, that it so can move towards the ignition anode under the influence of the mercury forced through it.
  • the drawing shows, as a constructive example of the invention, the cathode of a rectiller in a metal container.
  • G is the sloping bottom of the metal container, J the cathode insulator and B the bottom plate of the cathodewhich has above it the cathode mercury Hg.
  • Z is the ignition anode.
  • the U-shaped pipe R which is filled with mercury from the cathode is fixed to the bottom plate 1.
  • the other limb of the pipe is formed into a cylinder N and contains the float E which can be actuated by the ignition coil M.
  • the cylindrical boring in the cathode bottom plate B, to which the pipe R leads, serves as a guide to the nozzle D.
  • the nozzle is provided for.
  • the boring is connected to the cathode mercury and to the pipe R through openings in the upper end-stop r-i and in certain cases through clearances in the guide ring F of the nozzle.
  • the moving nozzle 1) is arranged in i the cathode container so that its opening is under the surface of the cathode mercury both before it is lifted by the mercury forced through it and after its stroke is completed.
  • the nozzle is most suitably made of a metal
  • the specific gravity of which is greater than mercury for example tungsten, tantalum, molybdenum, etc., which have also the property of high melting points.
  • tungsten, tantalum, molybdenum, etc. which have also the property of high melting points.
  • the return of the nozzle may be assisted by a compression spring C placed between A and F. In this case it is not necessary to make the nozzle of a metal of a higlb er specific gravity than that of mercury, When igniting the rectifier a current impulse is sent throughthe coil M wherebythe piston E is drawn into the cylinder N. The mercury is forced from the cylinder through the tulle Rand out of the nozzle D.
  • the nozzle Due to the frictionofthe inercuryagainst the inner wall of the nozzle and by the mercurys upward movement, the nozzle will be lifted towards the anode, that is to say, the intervening layer of mercury, through which the jet has to break, is therefore reduced.
  • the mercury jet is consequently conducted in the tube until it breaks through the surface and thus faulty ignition is avoided.
  • the mercury thrown againstthe ignition anode forms a momentary electrical connection between it and the mercury of the cathode.
  • the piston will be lifted into its original position by the mercury flowing back as soon as the ignition current to the coil'M is interrupted.
  • the pipe R and the nozzle guiding cylinder will be refilled through the nozzle'D.
  • the device 1 is thus ready for further ignition.
  • An ignition device as claimed in claim 1 characterized by the featurethat the movable nozzle is so arranged in the cathode container that its opening is under the surface of the cathode mercury before it is moved by the mercury forced through it. a 3.
  • An ignition device as claimed in claim 7 characterized by the feature that the movable nozzle is made ofa metal, the specific gravity of which is greater than that of mercury. V l
  • An ignition device as claimed in claim 1 characterized by the feature that the movable nozzle is made of a metalhaving a high melting point (tungsten, tantalum, molybdenum). N 6. An ignition device as claimed in claim- '1, characterized by the feature thatthe movable nozzle is returned to its original position by means of a spring.

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  • Nozzles (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
US348029A 1928-03-19 1929-03-18 Ignition device for mercury-arc rectifiers Expired - Lifetime US1781330A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1781330X 1928-03-19

Publications (1)

Publication Number Publication Date
US1781330A true US1781330A (en) 1930-11-11

Family

ID=7743022

Family Applications (1)

Application Number Title Priority Date Filing Date
US348029A Expired - Lifetime US1781330A (en) 1928-03-19 1929-03-18 Ignition device for mercury-arc rectifiers

Country Status (2)

Country Link
US (1) US1781330A (de)
CH (1) CH135338A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3084272A (en) * 1959-03-04 1963-04-02 Bbc Brown Boveri & Cie Jet ignition for current converters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3084272A (en) * 1959-03-04 1963-04-02 Bbc Brown Boveri & Cie Jet ignition for current converters

Also Published As

Publication number Publication date
CH135338A (de) 1929-09-15

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