US2330600A - Discharge tube - Google Patents

Discharge tube Download PDF

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Publication number
US2330600A
US2330600A US395888A US39588841A US2330600A US 2330600 A US2330600 A US 2330600A US 395888 A US395888 A US 395888A US 39588841 A US39588841 A US 39588841A US 2330600 A US2330600 A US 2330600A
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United States
Prior art keywords
tube
space
supply
vessel
mercury
Prior art date
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Expired - Lifetime
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US395888A
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English (en)
Inventor
Kuipers Minne
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Individual
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Individual
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Publication of US2330600A publication Critical patent/US2330600A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/02—Details
    • H01J17/22—Means for obtaining or maintaining the desired pressure within the tube
    • H01J17/26—Means for producing, introducing, or replenishing gas or vapour during operation of the tube

Definitions

  • the present invention relates fito discharge tubesA and -tol a method dflmanufacturing .the same. More particularly-g-theinvention relates to vapour-lled discharge-tubes, for-examplemercury vapour Vdischarge tubesl ⁇ with incandescent cathodes; xr/hichfilling ⁇ is replenishedefrom a-supply of Vapour producing substance Lprovided inthe foot of the-tube. e v
  • Theiinventons has for its purpose toconstruct and to arrange the.l supply Lvesselin such,l manner that-the vapour-producingsupply mayrbe gintroduced in a very simple manner without freaching the .discharge space ⁇ andi that linvthisrmzzase neither during rtransport nor duringloperation of theftube does an ⁇ .excess otrvapour-producingsub,-y .e
  • 'theasllpply vessel for the( vapour-producing substancelarranged ⁇ in theA foot of the tube mayfbeyprovidedat; thefside of' and ⁇ preferably concentricall-p around ythe exhaust tube and communicatesfwithxthejlatteryin such manner ⁇ that during exhaustion ythe vapourproducingsubstance may be :introduced sinto.A the supply vesselfrom that end of.
  • This construction may further be improved by closing those ends of the two portions of the exhaust tube which are turned towards one another by means of fine metallic gauze having a mesh width of 0.2 mm. at the most, for exam: ple of nickel wire and preferably in the shape of caps. If with this construction a drop of the vapour-producing material might reach the space between the pieces of gauze the latter still prevent in an efficient manner the material from penetrating into both portions of the exhaust tube.
  • These caps of gauze do not give rise to an inadmissible circulation resistance for the gases or vapours pumped away or for the vapours passing from the vapour-producing supply to the discharge space.
  • Fig. 1 represents an incandescent cathode rectifying tube provided with a supply vessel according to the invention.
  • Fig. 2 shows one favourable form of construction of the supply vessel.
  • Fig. 1 represents a rectifying tube comprising a cylindrical glass vessel I, a directly heated incandescent cathode 2, and an anode 3.
  • supply conductors 4 of the cathode are sealed into a pinch 5 and 4at the other end a supply conductor 6 of the anode is sealed into the glass wall by means of a chrome-iron plate 'L
  • the cathode helix 2 which is directly heated and is provided with an activating layer of oxide, is surrounded by a cylindrical screen 8 which is conductively connected to one of the cathode poles and is constructed so as to be closed at the back-side of the cathode and open at the end turned towards the anode.
  • the anode 3 y is constituted by a cylinder open at one end. Said cylinder has been drawn from a sheet of nickel and blackened by carbonisation or in any other manner and surrounds the open end of the cathode screen in the way of a cup.
  • the temperature of this supply which determines the vapour pressure of the tube, may be regulated during manufacture once forall by arranging the vessel in the exhaust tube ⁇ at a higher or lower level.
  • the mercury may be introduced from below through the exhaust tube and over the lengthening piece I5 of the latter into the supply vessel I3 without attaining the discharge space proper.
  • That portion of the glass tube I2 which leads to the interior of the discharge tube protrudes by an extension I6 into the supply vessel I3 and thus forms, jointly with the extension I5, a mercury trap which serves to prevent, in cooperation with the extension I5, the passage of liquid mercury to the discharge space during transport of the tube.
  • the extensions I5 and I6 are covered by sheets of nickel gauze I'I and I8 respectively having a mesh width of 0.135 mm. and a wire diameter of 0.045 mm., which prevents spattering mercury when attaining the slit with a height of about 2 mms. between the extensions, from penetrating into the exhaust tube.
  • the rectilinear shape of the latter tube is not altered by the above-described construction and the gauze does not constitute an appreciable obstacle to the passage of gases to be pumped away to the exhausting device or of the liquidV mercury, during the filling operation, in the direction ofthe supply vessel I3.
  • the ascending mercury is divided and slightly braked by the gauze.
  • the construction described renders it superuous to burn out the tube anew when it is put into operation, for example after transport, for the purpose of removing excessive mercury which sticks to the electrode and is favourable to the production of back-ignition.
  • the tube which is represented to scale inthe drawing, has a bulb diameter of 60 mms. and the annexed scale permits to determine the other dimensions of the tube in any easy manner.
  • the incandescent cathode has a heating voltage of 5 volts'and a heating current of 14 amperes. rlhe .maximum mean value of the anode current which is allowable during operation amounts to 2,5 amps., the peak value being about l10 amps. According to regulations the tube can sustain in the blocking phase a maximum peak value of the voltage of 20,000 volts and for a short time this value may even arnountto 45,000 volts.
  • the lengtheningpiece l5 has a funnelshaped extension 20 which terminates about at the height of the lower end of Athe lengthening piece I6, a cap, 2I of metal gauge being provided which takes up the lengthening piecel I6 in a pointed re-entrantpqrtion 22, the arrangement being such that liquid mercury coming from below is diverted by the point 22 of the tube l2-l6 and can easily attain the supply space through the funnel-shaped extension 2l! and the gauge 2l.
  • the peculiarity of the construction is that it is impossible for the mercury in the vessel I3 when moving towards lthe discharge space to attain the tube
  • the dimensions of the construction must be so chosen that no excessive speed is imparted to the mercury, which may be achieved by maintaining the lengths of the free paths in the supply vessel as small as possible; preferably they should not be longer than double the diameter of the exhaust tube.
  • a discharge tube comprising an envelope, electrodes and a vapor lling within the envelope
  • said member comprising a chamber portion and two tubular portions arranged in alignment and extending into said chamber, said tubular portions forming a space with said chamber portion and having their adjacent ends spaced apart to form an annular slit, a supplyv of vapor-producing material within said space, one of said tubular portions being connected to the space Y within the envelope, and the other tubular por y Y 3 alignment and extending into said chamber, said tubular portions forming a space with said chamber portion and having their adjacent ends spaced apa-rt to form an annular slit having a height of 3 mms. at the most, a supply of vaporproducingmaterial within said space, one of said tubular portions being connected to fthe space tion serving to introduce the vapor-producing material into the space formed in said chamber. ⁇
  • a discharge tube comprising an envelope, electrodes and a vapor lling fwithin the enve- Y lope, an exhausting member connected to the envelope, said member comprising fa chamber 4 metallic gauze screen members disposed over said supply of vapor-producing material within the within the envelope, and the other tubular por.
  • a discharge tube comprising an envelope
  • an exhausting member connected tothe envelope, said member comprising a chamber portion and two tubular portions arranged in adjacent ends, a supply of vapor-producing material within the space formed in said chamber,
  • a discharge tube comprising an envelop lelectrodes and a vapor filling within the envelope, an exhausting member connected to the envelope, said member comprising a chamber portion and two tubular portions arranged in alignment andextending into said chamber, one of the.” tubularportions being connected to the space within the envelope, a substantially conical metallic gauze screen disposed over the extending end of said tubular portion, the second tubular ,Y
  • tubular portion serving to introduce a vaporproducing materialv into said chamber, and a supply ofthe vapor-producing material within portions.

Landscapes

  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US395888A 1940-06-25 1941-05-29 Discharge tube Expired - Lifetime US2330600A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL223862X 1940-06-25

Publications (1)

Publication Number Publication Date
US2330600A true US2330600A (en) 1943-09-28

Family

ID=19779535

Family Applications (1)

Application Number Title Priority Date Filing Date
US395888A Expired - Lifetime US2330600A (en) 1940-06-25 1941-05-29 Discharge tube

Country Status (5)

Country Link
US (1) US2330600A (en))
CH (1) CH223862A (en))
FR (1) FR875391A (en))
GB (2) GB551226A (en))
NL (1) NL56513C (en))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4705987A (en) * 1985-10-03 1987-11-10 The United States Of America As Represented By The United States Department Of Energy Very high efficacy electrodeless high intensity discharge lamps

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4035682A (en) * 1976-08-26 1977-07-12 General Electric Company Universal burning alkali metal vapor lamp with amalgam storage in exhaust tubulation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4705987A (en) * 1985-10-03 1987-11-10 The United States Of America As Represented By The United States Department Of Energy Very high efficacy electrodeless high intensity discharge lamps

Also Published As

Publication number Publication date
FR875391A (fr) 1942-09-18
GB601871A (en) 1948-05-13
CH223862A (de) 1942-10-15
NL56513C (en))
GB551226A (en) 1943-02-12

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