US3645599A - Device for uniting tubular articles with sealing elements in a gastight manner - Google Patents

Device for uniting tubular articles with sealing elements in a gastight manner Download PDF

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Publication number
US3645599A
US3645599A US12052A US3645599DA US3645599A US 3645599 A US3645599 A US 3645599A US 12052 A US12052 A US 12052A US 3645599D A US3645599D A US 3645599DA US 3645599 A US3645599 A US 3645599A
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Prior art keywords
oven
holder
strip
articles
shaped
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US12052A
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English (en)
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Johannes Maria Van Bragt
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels

Definitions

  • An oven device suitable for uniting in a gastight manner a plurality 'of tubular envelopes of densely sintered material having sealing members at both ends.
  • the oven device can be made to cooperate with a vacuum system and a gas supply and comprises a U-shaped heating member of graphite where the envelopes, situated in a row between the limbs of the heating 5 0083 w wnw 2 0 9.l.8,1 9 l1 6 20% H/ H 3 9 0 /01..
  • BYJOHANNES u. was BRAGT AGENT DEVICE FOR UNITING TUBULAR ARTICLES WITH 'SEALING ELEMENTS IN A GASTIGI-IT MANNER in which the envelope of the discharge space consists of transparent densely-sintered aluminum oxide and comprises at least one current supply member which is secured in the envelope in a gastight manner.
  • the product described in said patent ap- ..plication comprises a tubular body which at one end comprises a cylindrical'portion in which a sealing element consisting of atransparent densely sintered aluminum oxide is situmember is-secured in a gastight manner by means of a solder glass having a melting point higher than 800 C.
  • This lamp is'furthermore provided with a cover consisting of transparent densely sintered aluminum oxide and bearing against the end of the cylindrical portion of the envelopeand against the sealing element situated therein, said cover comprising an aperture for the current supply member and beingsecured in a gastight manner to the envelope, the sealing element, and the current supply member by means of a solder glass having a melting point higher than 800 C. and lower than the melting point of the transparent densely sintered aluminum oxide and that of the metal of the current supply member.
  • the method used in said patent application is a chamber process in which the chamber is formed by a glass bell placed in the holder and evacuated or filled with an inert gasand in which adhesive.
  • said glass bell is furthermore arranged an annular member of graphite around the parts of the tubular article to be heated, said member being heated by means of a highfrequency field applied outside the glass bell in such manner that the radiant heat necessary for uniting the tube and the "sealing member is produced in the graphite ring. So the article is only heated at its end, so locally.
  • Thedevice described in the above-mentioned patent application is in principle suitable only to provide one article with a sealing member and hence less suitable for use in the manufacture of large series of said lamps.
  • the object of the present invention is to provide a device with which a number of tubular articles can be simultaneously provided with a sealing member supporting an electrode.
  • the deice according to the invention is characterized in that it comprises an oven which can be made to communicate with a vacuum system and, if desirable, with a gas dosing system in which at least two parallel arranged striplike heating members are'rigidly secured and are connected to a voltage source the device furthermore comprising at least one holder in which the tubular articles which are each provided with a sealing member can be arranged in a row, if desirable with the interposition of an adhesive, said holder being arranged in the oven in such a manner that the articles are situated with their ends between the two strip-shaped current conveying heating members.
  • the oven meant here is a chamber oven.
  • the oven comprises at least one sealing ring, in which the heating members are secured in one part and the holder can be placed on or is formed by the other part.
  • FIG. 1 shows a lamp to be composed which contains an envelope of sintered material
  • FIG. 2 is a diagrammatic side elevation of an oven used in composing said lamp
  • FIG. 3 is a cross-sectional view taken on the line III-III of FIG. 2;
  • FIG. 4 is a cross-sectional view taken on the lines IV-IV of FIG. 3 of the holder to used with the oven shown in FIGS. 2
  • FIGS. 5 and 6 are a plan view and a side elevation, respectively, of the heater device used in the oven.
  • FIG. 1 shows a part of a discharge lamp as is described in the published Dutch Pat. application No. 6,704,681.
  • This lamp comprises a tubular envelope of transparent densely sintered aluminum oxide.
  • Current supply members 3 and 5 of niobium are situated at either end of the envelope 1.
  • Two sealing elements which likewise consist of transparent densely sintered aluminum oxide are denoted by 7 and 9 and are secured hi the envelope 1 by sintering.
  • 11 and 13 denote two covers which also consist of densely sintered aluminum oxide.
  • 15 denotes a solder glass with which the current supply member 3 is secured both to the cover 11 and to the sealing element 7. This solder glass is also present between the cover 1 l and the-sealing element.
  • the electrode of the lamp consists of a tungsten rod 17 secured in the current supply member 3 by means of a titanium solder 19.
  • This rod comprises a tungsten coil 21; the coil may be covered with a material which readily emits electrons.
  • the envelope 1 is first provided with the two sealing elements 7 and 9 which comprise each a central aperture in accordance with the abovementioned Dutch patent application.
  • the current supply member 3 comprising the parts 17, 19, 21 is held and the cover 11 is placed on the sealing element 7 with the interposition of a ring of glass or a melting ceramic material which closely surrounds the member 3.
  • An analogous ring of glass is then placed on the cover.
  • a glass material may be used such as the material described in British Pat. specification No. 1,019,821.
  • the assembly is placed in a glass bell in which an argon atmosphere is maintained and the envelope is surrounded at its one end by a ring of graphite which is heated by means of a high-frequency coil arranged outside the glass bell and which causes the solder glass to melt. Upon cooling a gastight seal is obtained.
  • the glass bell is then removed.
  • the other end of the envelope is then provided in an analogous manner with the cover and a current supply member 5, again with the interposition of the required glass rings.
  • the assembly is then again exposed in the glass bell to a thermal treatment of the high-frequency heated ring of graphite.
  • a quantity of mercury and alkali metal is provided in the tubular envelope in which, during the addition of this metal, an argon atmosphere must be maintained in the envelope.
  • the tubular envelope in the glass bell is evacuated for degassing the various components and is then filled with xenon. As aresult of this the interior of the envelope 1 is also provided with said xenon gas. Only then does heating-take place. In this method only one glass bell per seal is used. i
  • This device comprises a chamber oven which is constructed for subjecting a large number of tubular envelopes l, for example, 20, simultaneously to the thermal treatment.
  • FIGS. 2 and 3 The oven used in this device is shown in FIGS. 2 and 3.
  • 23 denotes a cylindrical portion and 25 an angular portion, between which portions a sealing ring 27 is present.
  • the angular portion 25 comprises ducts 26, 28, 30, 32 for water-cooling.
  • This portion comprises a chamber 31 which can be made to communicate with the vacuum system (connection 35) by means of the duct 33. Via this chamber 31 a vacuum can extend up to in the cylindrical chamber 37 of the portion 23.
  • This portion 23 comprises a block 39 in which chambers 41,. 43, 45, '47, 49 and 51 are recessed which, together with the surrounding jacket 53, constitute a number of chambers which can also be made to communicate with a water-cooling system.
  • a U-shaped heating member of graphite which is shown in broken lines in FIG. 2 and is denoted by 55 is arranged in said portion; in FIG. 3 the limbs of the U are denoted by 57 and 59.
  • This member (see also FIGS. and 6) is secured with its widened poles 61 and 63 to two watercooled high-vacuum-tight current lead-in members which are insulated relative to each other and to the oven wall and which are coupled to the connection terminals of a voltage source.
  • This heating member is surrounded by a heat-reflecting screen 65 of molybdenum which is supported by the cylindrical chamber 67 in the portion 23 at only a few points of its circumference.
  • a molybdenum plate 69 is secured to said screen 65.
  • the two ends of the cylindrical portion 23 are closed by covers 71 and 73, the heating member 55 being secured to the cover 71 only via the widened poles 61 and 63.
  • the inner side of the cover 73 is provided with a few layers of a heat-reflecting material.
  • the portions 23 and 25 belong to the stationary part of the oven. They furthermore comprise ducts which open into the chamber 31 and can be made to communicate with a gas supply device.
  • the ducts 75 and 76 communicate with inlets of argon of different pressures, while the ducts 77 and 78 can be made to communicate with an inlet and outlet, respectively, for xenon.
  • the oven furthermore comprises a movable bottom 79 which can close the chamber 31 via sealing ring 80.
  • This bottom 79 comprises a fitting surface 81 on the upper side of which 20 holders 83 are secured. These holders are situated at equal distances from each other. Members 85 are forced upwards in said holders by compression springs 87. Said holders are constructed for containing the envelopes 1 which at their one end have to be united with sealing members in a gastight manner.
  • the bottom 79 bears on the platform 89 which is secured to a vertically movable rod 91. In a downward position, the bottom 79 can be removed from the platform and the holders 83 be provided with tubular envelopes 1. All this is arranged so that when the bottom part 79 is moved to its uppermost position, the tubular envelopes in the holders are just situated with their free ends between the limbs 58 and S9 of the U-shaped heating member 55.
  • the pins 93 are then removed and the envelopes 1 are placed in the holders 83 with their sealed ends.
  • the tubular envelopes l are then filled with argon in a vertical position by means of a pipe connected to a supply of argon. While maintaining the flow of argon a pill of sodium amalgam is dosed in the envelope by means of a dosing device as is described in Dutch Pat. application No. 6,803,906.
  • the cover 13, the current supply member 5 and a set of rings of glass or a melting ceramic are then rapidly placed on the envelope 1.
  • the bottom 79 is again coupled to the oven portion 25. Then the oven is evacuated again.
  • the time expiring between the dosing of the first pill and the beginning of evacuation is approximately 4 minutes. Such a small quantity of ambient air is found to diffuse in the envelopes within these 4 minutes that the amalgam pills are not noticeably attacked.
  • the heating member is heated at approximately 1 ,000 C.
  • a device for uniting in a gastight manner a number of tubular articles with sealing elements provided with electrodes at their one ends characterized in that it comprises an oven which is adapted to communicate with a vacuum system and, in which at least two parallel arranged strip-shaped heating members are rigidly arranged and are connected to a voltage source, the device furthermore comprising at least one holder in which one end of the tubular articles which are each provided with a sealing member can be arranged in a row, said holder being arranged in the oven in such manner that each of the articles are situated with their other end between the two strip-shaped current conveying heating members wherein the oven comprises at least two portions which can be separated from each other and between which a sealing ring is arranged in which the heating members are secured in one portion and the holder can be placed on or be formed by the other portion.
  • a device as claimed in claim 2 characterized in that the two strip-shaped members constitute the limbs of a U-shaped heating'member, which limbs are coupled at their free ends directly to a voltage source.
  • a device as claimed in claim 1 further comprising a gas dosing system connected to and cooperating with said oven and said vacuum system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Resistance Heating (AREA)
  • Furnace Details (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Ceramic Products (AREA)
US12052A 1969-02-18 1970-02-17 Device for uniting tubular articles with sealing elements in a gastight manner Expired - Lifetime US3645599A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6902495A NL6902495A (no) 1969-02-18 1969-02-18

Publications (1)

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US3645599A true US3645599A (en) 1972-02-29

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US12052A Expired - Lifetime US3645599A (en) 1969-02-18 1970-02-17 Device for uniting tubular articles with sealing elements in a gastight manner

Country Status (6)

Country Link
US (1) US3645599A (no)
JP (1) JPS5019870B1 (no)
BE (1) BE746045A (no)
FR (1) FR2035525A5 (no)
GB (1) GB1289616A (no)
NL (1) NL6902495A (no)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967871A (en) * 1972-06-23 1976-07-06 Egyesult Izzolampa Es Villamossagi Resvenytarsasag Process for manufacturing tubeless vacuum electric discharge lamps
US20050007118A1 (en) * 2003-04-09 2005-01-13 John Kitching Micromachined alkali-atom vapor cells and method of fabrication
US20090309668A1 (en) * 2008-06-17 2009-12-17 Bulatowicz Michael D Reversible Alkali Beam Cell
CN102347183A (zh) * 2011-10-09 2012-02-08 东南大学 一种陶瓷金卤灯电弧管封接炉

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678958A (en) * 1950-12-08 1954-05-18 Hintenberger Karl Electric oven for the burning of ceramic articles
US2863976A (en) * 1956-07-10 1958-12-09 American Motors Corp Range
US3036193A (en) * 1959-10-14 1962-05-22 Gen Motors Corp Removable oven liner
US3192006A (en) * 1961-06-02 1965-06-29 Western Electric Co Apparatus for finishing lamps
US3403212A (en) * 1964-09-21 1968-09-24 Japan Atomic Energy Res Inst Electric furnace having a heating element of carbon or graphite for producing temperatures under high pressures
US3404874A (en) * 1964-09-25 1968-10-08 Lectromeit Corp Vacuum furnace
US3546348A (en) * 1968-04-01 1970-12-08 Westinghouse Electric Corp Non-consumable electrode vacuum arc furnaces for steel,zirconium,titanium and other metals and processes for working said metals

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678958A (en) * 1950-12-08 1954-05-18 Hintenberger Karl Electric oven for the burning of ceramic articles
US2863976A (en) * 1956-07-10 1958-12-09 American Motors Corp Range
US3036193A (en) * 1959-10-14 1962-05-22 Gen Motors Corp Removable oven liner
US3192006A (en) * 1961-06-02 1965-06-29 Western Electric Co Apparatus for finishing lamps
US3403212A (en) * 1964-09-21 1968-09-24 Japan Atomic Energy Res Inst Electric furnace having a heating element of carbon or graphite for producing temperatures under high pressures
US3404874A (en) * 1964-09-25 1968-10-08 Lectromeit Corp Vacuum furnace
US3546348A (en) * 1968-04-01 1970-12-08 Westinghouse Electric Corp Non-consumable electrode vacuum arc furnaces for steel,zirconium,titanium and other metals and processes for working said metals

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967871A (en) * 1972-06-23 1976-07-06 Egyesult Izzolampa Es Villamossagi Resvenytarsasag Process for manufacturing tubeless vacuum electric discharge lamps
US20050007118A1 (en) * 2003-04-09 2005-01-13 John Kitching Micromachined alkali-atom vapor cells and method of fabrication
US20090309668A1 (en) * 2008-06-17 2009-12-17 Bulatowicz Michael D Reversible Alkali Beam Cell
US7893780B2 (en) 2008-06-17 2011-02-22 Northrop Grumman Guidance And Electronic Company, Inc. Reversible alkali beam cell
CN102347183A (zh) * 2011-10-09 2012-02-08 东南大学 一种陶瓷金卤灯电弧管封接炉
CN102347183B (zh) * 2011-10-09 2014-01-08 东南大学 一种陶瓷金卤灯电弧管封接炉

Also Published As

Publication number Publication date
JPS5019870B1 (no) 1975-07-10
DE2005630A1 (de) 1970-09-03
DE2005630B2 (de) 1976-07-29
BE746045A (fr) 1970-08-17
GB1289616A (no) 1972-09-20
NL6902495A (no) 1970-08-20
FR2035525A5 (no) 1970-12-18

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