EP0756312A2 - Electrode comportant un élément de refroidissement - Google Patents

Electrode comportant un élément de refroidissement Download PDF

Info

Publication number: EP0756312A2
Authority: EP; European Patent Office
Prior art keywords: heat sink; powder; electrode according; electrode; sinter
Prior art date: 1995-07-26
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.): Granted

Application number

EP96111871A

Other languages

German (de)

English (en)

Other versions

EP0756312A3 (fr

EP0756312B1 (fr

Inventor

Oliver Prause

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.)

Gesellschaft fur Wolfram-Industrie Mbh

Original Assignee

Gesellschaft fur Wolfram-Industrie Mbh

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.)

1995-07-26

Filing date

1996-07-23

Publication date

1997-01-29

1996-07-23 Application filed by Gesellschaft fur Wolfram-Industrie Mbh filed Critical Gesellschaft fur Wolfram-Industrie Mbh

1997-01-29 Publication of EP0756312A2 publication Critical patent/EP0756312A2/fr

1997-03-12 Publication of EP0756312A3 publication Critical patent/EP0756312A3/fr

2000-05-03 Application granted granted Critical

2000-05-03 Publication of EP0756312B1 publication Critical patent/EP0756312B1/fr

2016-07-23 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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Classifications

- 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
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/022—Manufacture of electrodes or electrode systems of cold cathodes
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
- H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode

Definitions

the invention relates to an electrode with a heat sink according to the type specified in the preamble of claim 1.
Discharge lamps such as metal halide lamps, generally have two electrodes of this type with dopants that promote electron emission, one electrode forming the anode and the other electrode forming the cathode. These electrodes are placed, for example, in a container made of temperature-resistant quartz glass. In addition to an inert gas, metals and / or metal halides are also present in this glass container.
the electrodes are arranged opposite one another.
a tungsten wire is usually wound tightly on the electrode in one or more layers.
the known electrode has the disadvantage that the winding forming the heat sink ensures insufficient cooling of the electrode.
the relevant heat transfer takes place through heat conduction between the electrode and the wire wound around this electrode.
the cooling of the electrode is impaired by the loss of contact between the electrode and the wire winding.
the invention has for its object to develop an electrode according to the type specified in claim 1 in such a way that optimal cooling of the electrode tip is achieved and the life of the electrode is increased.
the direct connection of the heat sink to the electrode is achieved by first arranging the material of the heat sink in powder form around the electrode. Subsequently, the powder, pressed to the electrode, is compressed in a powder metallurgical process and in this way with connected to the electrode. It is expedient here that the compression process consists of a pressing or shaping process and a subsequent sintering process.
the powder of the heat sink consists in particular of tungsten and / or molybdenum.
a sinter-activating additive is added to the powder of the heat sink. This enables indirect sintering in the furnace.
the sinter-activating additive is formed by the elements of subgroup VIII of the Periodic Table of the Elements. Crystalline nickel, palladium and / or platinum are preferably used.
the powder of the heat sink prefferably contains up to 1.0% by weight of the sinter-activating additive before the pressing.
the powder of the heat sink is processed either wet chemical hydrometallurgical or dry mechanical.
the aim of these processing methods is that the sinter-activating additive is distributed as homogeneously and finely as possible on the particles of the powder of the heat sink.
a thin layer on the grain surface of the powder is required.
the heat sink is useful to design the heat sink from a thermodynamic point of view, for. B. cylindrical, with cooling fins and / or with a porous surface.
the heat sink is arranged coaxially with respect to the electrode and completely covers the electrode in some areas.
the temperature-time profile determined as a function of the features mentioned is run through.
the sintering process is carried out in a protective atmosphere (e.g. dry hydrogen, argon).
a protective atmosphere e.g. dry hydrogen, argon
the invention is characterized in that the heat sink with different shapes can be easily manufactured and optimally connected to an electrode. This ensures optimal heat conduction and cooling in the area of the electrode tip.
the so-called “dead space” behind the arc attachment of the electrode can be effectively shielded in order to prevent an adverse effect on the discharge lamp in this regard.
FIG. 1 shows a side view of a discharge lamp 10 with two cylindrical electrodes 12 and 14, which are each arranged opposite one another in a quartz glass bulb 16 and are connected to current feedthroughs 18 and 20 and to electrical connections 22 and 24.
the sealed quartz glass bulb 16 is filled with gas such. B. argon, metal halides and small amounts of mercury.
a heat sink 26 and 28 is applied coaxially to the electrodes 12 and 14 at a short distance from the tip of the electrodes 12 and 14.
the heat sinks 26 and 28 are cylindrical and completely encompass the respectively assigned electrodes 12 and 14.
FIGS. 2a to 2e parts of the pressing tool for producing and applying the heat sinks 26 and 28 to the electrodes 12 and 14 are shown in different process sections in a schematic sectional view.
the lower punch 30 is moved upwards so far that it is flush with the die 34.
the receptacle 32 is moved downward relative to the lower punch 30.
the electrode 12, 14 is in the lower stamp 30 with the Recording 32 introduced vertically.
the electrode 12, 14 is centered by the cylindrical cavity 36 of the lower punch 30 formed.
the lower punch 30 and the receptacle 32 are then moved synchronously downward relative to the die 34, so that a cylindrical filling space 38 results, see FIG. 2b.
the powder 40 with the additives is introduced, for example with the aid of a funnel and with the generation of vibrations, into the filling space 38 and arranged around the electrode 12, 14.
the filling space 38 delimited by the die 34, the electrode 12, 14 and the lower punch 30 is completely filled with powder 40.
the powder 40 consists essentially of chemically pure tungsten and a sinter-activating additive of 0.12 to 0.5% by weight of nickel. It is processed using a known wet chemical hydrometallurgical process.
the average grain size of the tungsten powder is between 2 and 3.5 ⁇ m with a cumulative grain size of 5 ⁇ m at 90%.
an upper punch 42 is moved downward.
the upper punch 42 is provided with a bore 44 which is adapted to the diameter of the electrode 12, 14.
the upper region of the electrode 12, 14 is introduced into the bore 44 of the upper punch 42.
the receiving part 32 is then moved upward relative to the lower punch 30 until the lower end of the electrodes 12, 14 reaches a predetermined distance a from the upper edge of the lower punch 30, see FIG. 2d.
the lower punch 30 and the upper punch 42 then press the powder 40 together in cooperation with the die 34 and the electrode 12, 14.
the pressing movement of the upper punch 42 is indicated by the movement arrows 46 and 48.
the powder 40 comes into firm contact with the electrode 12, 14, see FIG. 2d.
a force in the axial direction on the electrode 12, 14 through the receptacle 32 or the upper punch 42 does not take place.
the upper punch 42 together with the lower punch 30 and the receiving part 32, is moved upwards again until the electrode 12, 14 with the compacted powder 40 is pushed out of the die 34 and can be removed.
the powder 40 now forms a so-called green compact, which is indirectly sintered together with the electrode 12, 14 in an oven at temperatures from 1,400 ° C. to 1,600 ° C. and holding times of up to 30 minutes.
the sintered powder 40 is converted into the metallic state by the sintering and now forms the heat sink 26 or 28.
the heat sink 26, 28 reaches a density of 80 to 99% of the theoretical density.
the finished electrode 12 is shown with its heat sink 26 in a sectional view.
the heat sink 26 is in direct contact with the electrode 12 and has a cylindrical shape.
the electrodes 12 and 14 each have a diameter of approximately 0.38 mm.
the heat sinks 26 and 28 are spaced approximately 0.75 mm from the electrode tip, each have a diameter of approximately 2 mm and a height of approximately 10 mm. This illustrates that the electrodes 12 and 14 and the heat sinks 26 and 28 have very small dimensions in the present example.

Landscapes

Engineering & Computer Science (AREA)
Manufacturing & Machinery (AREA)
Discharge Lamp (AREA)

EP96111871A 1995-07-26 1996-07-23 Electrode comportant un élément de refroidissement Expired - Lifetime EP0756312B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE19527348A DE19527348A1 (de)	1995-07-26	1995-07-26	Elektrode mit Kühlkörper
DE19527348		1995-07-26

Publications (3)

Publication Number	Publication Date
EP0756312A2 true EP0756312A2 (fr)	1997-01-29
EP0756312A3 EP0756312A3 (fr)	1997-03-12
EP0756312B1 EP0756312B1 (fr)	2000-05-03

Family

ID=7767855

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP96111871A Expired - Lifetime EP0756312B1 (fr)	1995-07-26	1996-07-23	Electrode comportant un élément de refroidissement

Country Status (2)

Country	Link
EP (1)	EP0756312B1 (fr)
DE (2)	DE19527348A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO1999033091A1 (fr) *	1997-12-22	1999-07-01	Koninklijke Philips Electronics N.V.	Lampe a decharge a halogenure de metal et a haute pression
WO1999033090A1 (fr) *	1997-12-20	1999-07-01	Thomas Eggers	Electrode pour lampes a decharge
EP1056115A3 (fr) *	1999-05-24	2004-08-11	Matsushita Electric Industrial Co., Ltd.	Lampe à décharge à haute pression
US7825603B2 (en)	2005-01-03	2010-11-02	Koninklijke Philips Electronics N.V.	Lighting assembly and method of operating a discharge lamp

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE19749908A1 (de) *	1997-11-11	1999-05-12	Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh	Elektrodenbauteil für Entladungslampen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1031421B (de) *	1956-10-16	1958-06-04	Patra Patent Treuhand	Nicht vorheizbare Oxydelektrode fuer Blitzlicht-Entladungslampen und Hochdruck-Entladungslampen
FR2069842A1 (en) *	1969-11-07	1971-09-10	Thomson Csf	Discharge tube thermo-electric converter
DE2222845A1 (de) *	1971-05-17	1972-12-07	Itt Ind Gmbh Deutsche	Emittierende Elektrode und Verfahren zu ihrer Herstellung
JPS5632641A (en) *	1979-08-28	1981-04-02	Toshiba Corp	Manufacture of electrode for electric discharge lamp
JPS5818863A (ja) *	1981-07-24	1983-02-03	Iwasaki Electric Co Ltd	高圧ナトリウムランプ
JPS60131751A (ja) *	1983-12-20	1985-07-13	Hamamatsu Photonics Kk	光源用放電管
JPS60218755A (ja) *	1984-04-13	1985-11-01	Hamamatsu Photonics Kk	光源用放電管
US5357167A (en) *	1992-07-08	1994-10-18	General Electric Company	High pressure discharge lamp with a thermally improved anode

1995
- 1995-07-26 DE DE19527348A patent/DE19527348A1/de not_active Withdrawn
1996
- 1996-07-23 EP EP96111871A patent/EP0756312B1/fr not_active Expired - Lifetime
- 1996-07-23 DE DE59605104T patent/DE59605104D1/de not_active Expired - Lifetime

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO1999033090A1 (fr) *	1997-12-20	1999-07-01	Thomas Eggers	Electrode pour lampes a decharge
US6437509B1 (en)	1997-12-20	2002-08-20	Thomas Eggers	Electrode for discharge lamps
WO1999033091A1 (fr) *	1997-12-22	1999-07-01	Koninklijke Philips Electronics N.V.	Lampe a decharge a halogenure de metal et a haute pression
EP1056115A3 (fr) *	1999-05-24	2004-08-11	Matsushita Electric Industrial Co., Ltd.	Lampe à décharge à haute pression
US7825603B2 (en)	2005-01-03	2010-11-02	Koninklijke Philips Electronics N.V.	Lighting assembly and method of operating a discharge lamp

Also Published As

Publication number	Publication date
EP0756312A3 (fr)	1997-03-12
DE59605104D1 (de)	2000-06-08
DE19527348A1 (de)	1997-01-30
EP0756312B1 (fr)	2000-05-03

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