EP0764341A1 - Lampe a decharge a vapeur de mercure basse pression - Google Patents

Lampe a decharge a vapeur de mercure basse pression

Info

Publication number
EP0764341A1
EP0764341A1 EP96909043A EP96909043A EP0764341A1 EP 0764341 A1 EP0764341 A1 EP 0764341A1 EP 96909043 A EP96909043 A EP 96909043A EP 96909043 A EP96909043 A EP 96909043A EP 0764341 A1 EP0764341 A1 EP 0764341A1
Authority
EP
European Patent Office
Prior art keywords
low
discharge lamp
lamp
tube
pressure
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.)
Withdrawn
Application number
EP96909043A
Other languages
German (de)
English (en)
Inventor
Horst Wedekamp
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.)
Wedeco Umwelttechnologien Wasser Boden Luft GmbH
Original Assignee
Wedeco Umwelttechnologien Wasser Boden Luft GmbH
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 Wedeco Umwelttechnologien Wasser Boden Luft GmbH filed Critical Wedeco Umwelttechnologien Wasser Boden Luft GmbH
Publication of EP0764341A1 publication Critical patent/EP0764341A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J61/28—Means for producing, introducing, or replenishing gas or vapour during operation of the lamp

Definitions

  • the invention relates to a mercury low-pressure discharge sheet according to the preamble of patent claim 1.
  • Low-pressure mercury discharge lamps are generally used to disinfect water or air. In addition, there are also applications in the UV irradiation of surfaces.
  • the low-pressure mercury discharge lamps generate UV radiation with a line spectrum with an intense emission line of wavelength 253.7 nm and considerably weaker emission lines of wavelengths below 200 nm with a maximum at around 185 nm and 194 nm.
  • the short-wave portion of UV radiation in the wavelength range of less than 200 nm is required for various photochemical processes, for example the emission line of approximately 185 nm for generating ozone from oxygen and for curing lacquers and adhesives. Even in the treatment of ultrapure water, which is required, for example, in the electronics industry for the production and manufacture of semiconductors, this short-wave radiation enables photo-oxidative degradation of pollutants.
  • mercury low-pressure discharge lamps At a certain mercury vapor pressure, mercury low-pressure discharge lamps have an optimal degree of efficiency, based on the radiation power at 254 nm.
  • the optimum vapor pressure, depending on the lamp tube cross section, is usually achieved with operating currents in the range from approximately 0.1 ampere to 1 ampere.
  • the operating current can be increased if an amalgam-forming metal filling is arranged within the lamp tube of the low-pressure mercury discharge lamp.
  • the amalgam is known to be a mercury alloy which, for. B. consists of mercury and indium. If such a metal filling is provided on the inside of the lamp tube of the low-pressure mercury discharge lamp between the electrodes or incandescent filaments in the region of the discharge path, the low-pressure mercury discharge lamp can be operated with a larger operating current of approximately 2 to 3 amperes.
  • the invention has for its object to improve a mercury low-pressure discharge lamp of the type mentioned in the preamble of claim 1 in such a way that, despite the circumstances described above, a substantial increase in short-wave UV radiation in the range from 170 to 200 nm and above all the emission line of 185 nm compared to UV radiation of 254 nm is reached.
  • the invention therefore presupposes the use of the metal filling which is known per se, but in a novel manner it is provided that the outer wall of the lamp tube has mechanical contact at the point where the metal filling is on the inner wall of the lamp tube or a mechanical contact is made with a heat sink.
  • the invention is based on the knowledge that the operating vapor pressure of the mercury of the low-pressure mercury discharge lamp depends on the wall temperature of the lamp tube and on the electrical operating parameters. For this reason, in the known mercury low-pressure discharge lamps, the possibility of increasing the operating current mentioned above does not lead to an increase in the radiation power either because the lamp tube of the low-pressure mercury discharge lamp then becomes too hot and the optimum operating vapor pressure of the mercury does not occur.
  • the cooling provided in the invention allows the mercury low-pressure discharge lamp to be operated with a higher operating current, with the result that the short-wave UV radiation rises significantly in the range from 170 to 200 nm, because cooling prevents it from being prevented the operating vapor pressure in the lamp tube rises and exceeds saturation.
  • the metal fillings are no longer arranged on the smooth inner wall of the lamp tube as before, rather the lamp tube has radially outwardly directed bulges in the form of dents which form depressions in the manner of a crucible, and within these bulges are the metal fillings.
  • the bulges are at least partially in contact with a heat sink, which in turn causes cooling, which enables the substantial increase in the operating current and thus the significant increase in the short-wave UV radiation in the range from 170 to 200 nm.
  • the metal filling is arranged in the immediate vicinity of the bulges mentioned above. It is crucial here that the metal fillings are arranged so close to the bulges mentioned that they lie in the effective range of the cooling zone and that significant cooling is still achieved.
  • the low-pressure mercury discharge lamp is arranged in a cladding tube which is transparent to UV radiation in such a way that the bulges of the lamp tube are at least are at least partially in contact with the outer cladding tube, the cladding tube forming the heat sink.
  • This embodiment is advantageous, for example, when the low-pressure mercury discharge lamp is designed with the outer cladding tube as a submerged emitter, the cladding tube being surrounded by a liquid medium. This liquid medium then advantageously supports the cooling.
  • the above-mentioned cladding tube prefferably has radially inward indentations at the locations of the metal fillings, which are in contact with the aforementioned locations of the metal fillings, the cladding tube forming the heat sink . It is crucial that the metal fillings are in contact with the outer cladding tube, which contributes to cooling.
  • the lamp tube of the low-pressure mercury discharge lamp expediently has a cross section of at least 0.5 cm and at most 12 cm, preferably about 3 cm.
  • the lamp tube has a cross section which is at least 30% smaller in the region of its discharge path than at the two outer ends in the region of the electrodes. At the two outer ends, the lamp tube thus has sections with a larger cross section than in the middle in the actual discharge area.
  • the metal fillings or the bulges of the lamp tube are located or the aforementioned indentations of the cladding tube in the region of the electrodes, that is to say in the region of the ends with the larger cross sections.
  • metal fillings are located in the region of the discharge path of the lamp tube, that is to say in the region with the smaller cross section.
  • a metal filling is preferably arranged on each side - adjacent to the areas with the larger cross section.
  • the invention can also be used to advantage if the lamp tube has a flat, elongated cross section deviating from the circular shape with two broad sides (radiation sides) and two narrow sides and is designed as a flat radiator known per se. The bulges or the metal fillings are then located on at least one narrow side of the flat radiator.
  • Fig. 1-9 different embodiments of a mercury low-pressure discharge lamp
  • FIG. 10 shows a graphical representation of the portions of the wavelengths or emission lines at approximately 185 nm and approximately 254 nm of the UV radiation generated. lung.
  • the lamp tube 12 has an inner wall 14 and an outer wall 28. At the ends there are in each case a base 22 with electrical connecting pins 24, which in connection with the inside of the Electrodes 20 (incandescent filaments) are provided in the lamp tube.
  • a metal filling 32 is firmly attached to the inner wall 14 of the lamp tube 12 in the area between the electrodes 20, and at the opposite point the outer wall 28 of the lamp tube 12 is in contact with a heat sink 46, which is formed, for example, by a heat sink can.
  • the heat sink 46 causes cooling in the area of the metal filling 32, so that the mercury low-pressure discharge lamp 10 can be operated with a comparatively high operating current of greater than 2.5 amperes. This results in a decisive increase in short-wave UV radiation in the range from 170 nm to 200 nm, compared to UV radiation of approximately 254 nm.
  • FIG. 2 shows a low-pressure mercury discharge lamp 10, in which two metal fillings 32 are provided.
  • the lamp tube 12 has two corresponding radially outward bulges 30 in which the metal fillings 32 are located. On the outer wall 28 of the lamp tube 12, these bulges 30 are in contact with the heat sinks 46.
  • a variant of a lamp tube with a bulge 30 is also shown in FIG. tion with the heat sink 46 is, however, the metal filling 32 is not in the bulge 30 itself, but in the immediate vicinity thereof. The metal filling 32 is still in the effective range of the heat sink 46, so that cooling can also take place here.
  • the low-pressure mercury discharge lamp 10 is designed as a submerged emitter, because the lamp tube 12 is located within a cladding tube 26 which is transparent to UV radiation.
  • the bulge 30, in which the metal filling 32 is located, is in contact with the cladding tube 26, which thus forms the heat sink.
  • Immersion heaters are usually used to irradiate liquids, which then surround the cladding tube 26, as a result of which the cladding tube 26 is particularly suitable for performing the function of a heat sink.
  • FIG. 5 also shows a low-pressure mercury discharge lamp 10 with an outer cladding tube 26.
  • This cladding tube 26 has an indentation 44 which is in contact with the outer wall 28 of the inner lamp tube 12, specifically at the point where on the inner wall the metal filling 32 is arranged. This is here directly on the inner wall 14 of the lamp tube 12, d. that is, unlike in FIG. 4, no bulge is provided here; the bulge is practically replaced by the indentation 44.
  • FIG. 6 shows another embodiment in partial representation, only one end of the low-pressure mercury discharge lamp 10 being shown for reasons of space.
  • the lamp tube 12 has on the two Ends in the area of the electrodes 20 a larger cross section than in the area of the actual discharge gap 18, that is to say in the central area.
  • the cross section in the central region of the discharge gap 18 is at least 30% smaller than in the region of the ends 16 with the larger cross section.
  • the at least one metal filling 32 is arranged in the region of one end 16 with the larger cross section on the inner wall 14 of the lamp tube 12 and is in turn connected to a heat sink 46, which here has a radially inward indentation in the region of the metal filling 32.
  • the heat sink 46 could thus also be formed by the cladding tube 26 shown in FIG. 5.
  • FIG. 7 also shows a low-pressure mercury discharge lamp 10, in which the ends of the lamp tube 12 have a larger cross section 16 than the discharge path 18.
  • the difference from Fig. 6 is that the metal filling 32 is arranged in the bulge 30, and that the heat sink 46 is flat.
  • the exemplary embodiment according to FIG. 8 also shows a lamp tube 12 in which the ends 16 have an enlarged cross section.
  • the metal filling 32 is not arranged in the region of the enlarged cross section 16, but in the region of the discharge path 18 in the bulge 30, which is in contact with the heat sink 46.
  • FIG. 9 shows, as a further exemplary embodiment, in a partial representation a flat radiator 34 in which the lamp tube has two broad sides 36 and two has narrow sides 38.
  • the bulge 30 for receiving a metal filling is located on a narrow side 38 of the flat radiator 34. This bulge is - which is not shown in FIG. 9 - also in contact with a heat sink or with a cladding tube.
  • the emission lines of the short-wave UV radiation 40 with a wavelength of approximately 185 n and the emission radiation 42 with a wavelength of approximately 254 nm are particularly striking.
  • the short-wave portion 40 of the radiation of 185 nm is almost 90% of the portion of the radiation 42 of 254 nm.
  • Such a high percentage of the short-wave radiation 40 of 185 nm is compared to the radiation 42 of 254 nm completely surprising and could not be achieved so far.

Landscapes

  • Discharge Lamps And Accessories Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

L'invention concerne une lampe à décharge à vapeur de mercure basse pression pour la production de rayons ultraviolets dans la gamme de longueurs d'onde comprises entre environ 170 nm et 280 nm pour l'exposition à un rayonnement de substances liquides ou gazeuses et/ou de surfaces. La lampe à décharge à vapeur de mercure basse pression comprend au moins un tube (12), dont la paroi interne (14) est dotée d'un remplissage métallique (32) formant un amalgame. Ce remplissage métallique est placé au moins en un point sur la paroi interne du tube, entre les électrodes de la lampe à décharge à vapeur de mercure basse pression, la paroi externe du tube étant, en ce point, en contact direct avec un refroidisseur (46).
EP96909043A 1995-04-05 1996-04-04 Lampe a decharge a vapeur de mercure basse pression Withdrawn EP0764341A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19512638 1995-04-05
DE19512638 1995-04-05
PCT/DE1996/000647 WO1996031902A1 (fr) 1995-04-05 1996-04-04 Lampe a decharge a vapeur de mercure basse pression

Publications (1)

Publication Number Publication Date
EP0764341A1 true EP0764341A1 (fr) 1997-03-26

Family

ID=7758787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96909043A Withdrawn EP0764341A1 (fr) 1995-04-05 1996-04-04 Lampe a decharge a vapeur de mercure basse pression

Country Status (4)

Country Link
EP (1) EP0764341A1 (fr)
JP (1) JPH10505197A (fr)
DE (1) DE19613468A1 (fr)
WO (1) WO1996031902A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10340704A (ja) * 1997-06-06 1998-12-22 Stanley Electric Co Ltd 自動車用放電ランプ
DE19946274C2 (de) * 1999-09-27 2003-04-17 Heraeus Noblelight Gmbh Elektrodenlose Entladungslampe und deren Verwendung
DE10201617C5 (de) * 2002-01-16 2010-07-08 Wedeco Ag Water Technology Amalgamdotierter Quecksilberniederdruck-UV-Strahler
US7095167B2 (en) 2003-04-03 2006-08-22 Light Sources, Inc. Germicidal low pressure mercury vapor discharge lamp with amalgam location permitting high output
EP1671350A1 (fr) * 2003-09-30 2006-06-21 Philips Intellectual Property & Standards GmbH Lampe a decharge gazeuse a basse pression comportant une matiere de remplissage gazeuse renfermant du gallium
DE102005023940B3 (de) * 2005-05-20 2007-02-15 Heraeus Noblelight Gmbh Direktkühlung eines Amalgamdepots in einem Quecksilber-Niederdruck-Amalgamstrahler
CA2621301C (fr) 2005-08-31 2013-04-30 Trojan Technologies Inc. Lampe a rayonnement ultraviolet, module source et systeme les renfermant
DE102006023870B3 (de) * 2006-05-19 2007-06-28 Heraeus Noblelight Gmbh Direktkühlung eines Amalgamdepots in einem Quecksilber-Niederdruck-Amalgamstrahler
EP1975976A1 (fr) * 2007-03-27 2008-10-01 Koninklijke Philips Electronics N.V. Lampe de décharge à vapeur de mercure basse pression pour désinfecter un milieu
JP5292598B2 (ja) * 2009-08-26 2013-09-18 岩崎電気株式会社 低圧水銀ランプ及び、殺菌または消毒方法
JP2013103427A (ja) * 2011-11-15 2013-05-30 Seiko Epson Corp 照射装置、及び照射方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE469579A (fr) * 1940-03-01
DE1852479U (de) * 1959-01-15 1962-05-30 Licentia Gmbh Anordnung zur kuehlung des zapfens bei hochleistungs-leuchtstofflampen.
DE1160947B (de) * 1960-11-28 1964-01-09 Licentia Gmbh Anordnung zur Kuehlung eines Zapfens oder Cadmium-Amalgam-Flecks von Leuchtstofflampen mit erhoehter Belastbarkeit
CA921541A (en) * 1970-03-03 1973-02-20 Suoh Masatake Small-sized fluorescent lamp
GB2073483B (en) * 1980-03-13 1984-09-26 Thorn Lighting Ltd Cooling lamps
JPS62281249A (ja) * 1986-05-30 1987-12-07 Toshiba Corp 大出力殺菌ランプ
US5095336A (en) * 1990-11-08 1992-03-10 Xerox Corporation Temperature control of a fluorescent lamp having a central and two end amalgam patches

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9631902A1 *

Also Published As

Publication number Publication date
JPH10505197A (ja) 1998-05-19
WO1996031902A1 (fr) 1996-10-10
DE19613468A1 (de) 1996-10-10

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