EP2443648A1 - Ensemble de lampe - Google Patents

Ensemble de lampe

Info

Publication number
EP2443648A1
EP2443648A1 EP10722938A EP10722938A EP2443648A1 EP 2443648 A1 EP2443648 A1 EP 2443648A1 EP 10722938 A EP10722938 A EP 10722938A EP 10722938 A EP10722938 A EP 10722938A EP 2443648 A1 EP2443648 A1 EP 2443648A1
Authority
EP
European Patent Office
Prior art keywords
lamp unit
lamp
reflector
discharge space
annular gap
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Withdrawn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
EP10722938A
Other languages
German (de)
English (en)
Inventor
Alex Voronov
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.)
Heraeus Noblelight GmbH
Original Assignee
Heraeus Noblelight 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 Heraeus Noblelight GmbH filed Critical Heraeus Noblelight GmbH
Publication of EP2443648A1 publication Critical patent/EP2443648A1/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Withdrawn legal-status Critical Current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
    • H01J61/30—Vessels; Containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field

Definitions

  • the invention relates to a lamp unit comprising at least one low-pressure mercury lamp and at least one reflector, wherein the lamp unit has a lamp unit longitudinal axis, along which a discharge space containing a filling gas extends.
  • Lamp units comprising at least one low-pressure mercury lamp and at least one reflector are widely used for lighting and UV applications, such as for browning, for UV sterilization or for activating chemical reactions.
  • the excitation of the filling gas is carried out by projecting into the discharge space electrodes or electrodeless by capacitive, inductive or micro-shaftelleunter basic excitation.
  • Mercury low pressure lamps are characterized by a high efficiency of about 40% for the conversion of electrical energy in UVC radiation. This results in typical performances of modern low-pressure mercury lamps around 100 watts and power densities around 1 W / cm.
  • a further increase in power density while maintaining high efficiency can theoretically be achieved by increasing the operating current and simultaneously increasing the lamp diameter.
  • the enlargement of the lamp diameter has a physical limit due to the so-called “self-absorption".
  • the "self-absorption" is based on interactions of the UVC photons with the mercury atoms in the filling gas atmosphere and manifests itself both at too high mercury levels. Over-concentrations as well as too long path lengths of the UVC photons within the discharge space in a decrease in the intensity or the efficiency of the UVC emission noticeable.
  • the nominal operating current of a low-pressure mercury lamp is usually designed for optimum mercury concentration in the discharge space and, accordingly, maximum UVC intensity. Exceeding the nominal operating current causes an increase in the temperature and thus the mercury concentration in the filling gas, which in turn leads to a higher self-absorption and thus to a reduction in U VC intensity.
  • amalgam lamps mercury is introduced into the discharge space in the form of an amalgam alloy.
  • the binding of the mercury in the amalgam counteracts its release into the discharge space. This allows higher operating currents (higher temperatures), so that compared to conventional mercury low pressure lamps three to six times higher performance and power densities can be achieved.
  • the further increase of the operating current above the optimum value also leads to higher losses due to self-absorption in amalgam lamps.
  • the invention has for its object to provide a lamp unit with very high power and power density and high efficiency of UVC radiation. Based on a lamp unit of the type mentioned, this object is achieved in that the discharge space forms a circumferential annular gap or an interrupted annular gap, which is bounded by a Abstrahlmantel Structure and by a reflector outer surface, which is associated with the reflector.
  • the radial cross section of the discharge space (seen in the direction of the lamp unit longitudinal axis) is not circular as usual, but annular.
  • the radial cross section of the discharge space is not circular as usual, but annular.
  • a ring with round, oval or polygonal cross-section is not circular as usual, but annular.
  • the discharge space forms at least over most of its length either a uniform, continuous space in the form of a closed, circumferential annular gap, or it is composed of several subspaces, each extending along the lamp unit longitudinal axis.
  • the lamp unit according to the invention comprises only a single mercury low-pressure lamp with an annular discharge space.
  • each of the discharge space subspaces can each be assigned to a low-pressure mercury lamp.
  • the discharge space subspaces (or the low-pressure mercury lamps, for example) consist of hollow-cylindrical elements. These are arranged around the lamp unit longitudinal axis so that they form the radially interrupted, approximately annular gap-shaped discharge space.
  • each subspace can be assigned a separate reflector, or the subspaces share one or more reflectors.
  • the discharge space has a total of - at least approximately - the shape of a hollow cylinder.
  • One of the two cylinder jacket surfaces of the discharge space forms the emission surface over which the UV working radiation is emitted.
  • the other cylindrical surface of the reflector is assigned. It is for example designed as a reflector or it is limited by a reflective medium. This cylinder jacket surface forms the reflector outer surface according to the invention.
  • the UVC photons emitted in the direction of the reflector are reflected back at the reflector and thus are not lost but contribute to the UVC flux.
  • the hollow-cylindrical, annular-gap-shaped discharge space in the lamp unit according to the invention enables a larger one Discharge space volume, which is determined at a given width of the discharge space by its outer diameter.
  • the larger volume allows the application of a higher operating current and thus a higher power and power density of the lamp unit according to the invention (while maintaining an optimal mercury concentration in the filling gas).
  • the width of the annular gap-shaped discharge space can be kept so small that the effect of "self-absorption" is maximally avoided by increasing the path length for the UVC photons the operating current, which can be determined by a few experiments.
  • the comparatively larger outer diameter of the discharge space and the additional inner wall lead to a noticeable enlargement of the free lamp surface, resulting in a more effective cooling of the lamp unit.
  • a more effective cooling counteracts a temperature increase during operation and thus also allows a higher operating current without exceeding the optimum mercury concentration in the filling gas.
  • the walls which delimit the annular gap inwards and outwards can have the same cross-sectional geometry or they can differ in their cross-sectional geometries. In the simplest case, the cross-sectional geometries are the same and the walls are coaxial with one another, so that the annular gap has the same gap width everywhere.
  • the reflector adjoining the discharge space is designed either as a separate component or as a coating in the area of the reflector outer surface.
  • the reflector may be provided on the outside of the discharge space, whereby the inner wall serves as a radiation jacket surface and the lamp unit acts as a cylindrical, inner radiating "inner radiator.”
  • the annular gap has an inner wall formed as a reflector outer surface.
  • the discharge space has an outwardly facing, closed or interrupted Abstrahlmantelization over which the UV working radiation passes to the outside.
  • Opposite is an inwardly facing, closed or interrupted reflector provided jacket surface adjacent to a reflector.
  • the reflector is formed either as a separate component or as a coating in the area of the reflector outer surface.
  • the annular gap-shaped discharge space has a gap width of a maximum of 40 mm, preferably a maximum of 35 mm.
  • the annular gap-shaped discharge space has an average gap width of at least 10 mm, preferably at least 15 mm.
  • the lamp unit according to the invention with an annular gap-shaped discharge space and adjoining reflector shows, for the reasons explained above, a positive effect on the power and efficiency of the UVC radiation even at a small inner diameter of the annular gap.
  • the production of the lamp unit according to the invention compared to conventional lamps requires a certain amount of additional design work, which is economically justifiable only by a significant increase in UVC performance.
  • a large inner diameter of more than 10 mm leads to a marked increase in the discharge volume without increasing the self-absorption. Therefore, the largest possible inner diameters of the low-pressure mercury lamp are preferred.
  • preferred outside diameters of the low-pressure mercury lamp are more than 20 mm, preferably more than 35 mm.
  • a reflector made of a dielectric material is advantageous. Therefore, in a preferred embodiment of the mercury low-pressure lamp according to the invention a reflector is preferred, which consists of a dielectric material. In this context, a reflector has proven particularly useful, which is designed as a reflective layer of opaque quartz glass.
  • the reflection properties are based on "diffuse reflection.” It has been shown that reflection layers made of opaque quartz glass in certain wavelength ranges make it possible to achieve reflectivities that are comparable to those of metallic reflectors.
  • the discharge space is formed as a circumferential annular gap between an outer tube and an inner tube.
  • the inner tube is disposed coaxially or eccentrically within the outer tube.
  • the cross-sectional geometries of inner tube and outer tube are the same or different and may be, for example, round, oval or polygonal.
  • the discharge space is particularly easy to realize as a circumferential, closed annular gap between pipes.
  • a coaxial or eccentric arrangement of inner tube and outer tube requires either a special adaptation of the electrode shape to the internal geometry of the discharge space or a special design of the discharge space in the region of the electrodes, for example a circular length portion of the discharge space. This effort is eliminated in an electrodeless excitation of the filling gas.
  • the reflector adjoining either the inner tube or the outer tube is preferably provided on the side of the tube facing away from the discharge space.
  • the reflector material facing away from the discharge space is not exposed to the discharge in the discharge space and there are no impurities to the filling gas.
  • the discharge space is composed as a radially interrupted annular gap of a plurality of low-pressure mercury lamp modules, which are arranged around the lamp unit longitudinal axis, the cylinder longitudinal axis parallel to the lamp unit longitudinal axis runs.
  • the annular gap is interrupted and its ring shape is approximated by the annular arrangement of the discharge spaces of the individual lamp modules.
  • the lamp modules are arranged on an envelope around the lamp unit longitudinal axis.
  • the lamp modules are designed identically as low-pressure mercury lamps with a conventional, cylindrical discharge space, for example with a discharge space which is circular or polygonal in cross-section.
  • the annular arrangement of the lamp modules forms in cross-section (seen in the direction of the lamp longitudinal axis) approximately a circular ring, an oval or a polygonal.
  • the individual lamp modules can be stored in a frame or they are connected to each other, for example by gluing or welding, and so fixed in the ring shape.
  • the surface area of the respective lamp module wall facing the lamp longitudinal axis acts either as a reflector surface or as a radiation surface.
  • the area acting as a reflector surface area is provided with a reflective layer or it adjoins a reflector.
  • the respective opposite area of the lamp module wall acts as a radiating surface.
  • a designed as a separate component reflector is provided by the lamp modules enclose a cylindrical interior, in which a cylindrical reflector component, for example in the form of a rod or tube is used.
  • the lamp unit according to the invention serves, in particular, to provide particularly high UVC powers and power densities.
  • a preferred embodiment of the lamp unit contributes to this, in which the at least one low-pressure mercury lamp is designed as an amalgam lamp.
  • the lamp unit according to the invention is distinguished by high power densities of preferably at least 5 W / cm, particularly preferably of at least 10 W / cm.
  • the unit W / cm refers to the length of the lamp unit viewed in the direction of its longitudinal axis.
  • FIG. 1 shows a radial cross section of a first embodiment of the mercury low-pressure lamp according to the invention with a circulating discharge space
  • FIG. 2 shows a radial cross section of an embodiment of the mercury low-pressure lamp according to the invention with an interrupted discharge space
  • FIG. 3 shows a further embodiment of the mercury low-pressure lamp according to the invention with an interrupted discharge space in a radial cross section
  • FIG. 4 shows a radial cross section of a further embodiment of the mercury low-pressure lamp according to the invention with a circulating discharge space.
  • the lamp unit 1 comprises an amalgam lamp 10 and a reflector 5.
  • the amalgam lamp 10 has an outer tube 8, in which an inner tube 9 is arranged coaxially with the longitudinal axis of the lamp unit 7.
  • Outer tube 8 and inner tube 9 are fused together at the front ends, so that between the outer tube 8 and inner tube 9, a vacuum-tight, annular in the illustrated cross-section, circumferential annular gap is generated, which forms the discharge space 6 of the amalgam lamp 10.
  • a discharge (not shown) is welded to the discharge space 6 in the usual way, containing mercury atoms in an amalgam alloy.
  • the filling gas is excited by microwaves or inductively with high frequency.
  • the longitudinal axis 7 of the lamp unit 1 is perpendicular to the plane of the page.
  • the inner tube 9 is made of quartz glass and is provided on its side facing away from the discharge space 6 inside with a reflector layer 5.
  • the reflector layer 5 is designed in the form of a 0.5 mm thick layer of opaque, synthetic quartz glass on the inner wall of the inner tube 9. For reasons of a clearer illustration, the thickness of the reflector layer 5 in Fig. 1 is exaggerated.
  • the inner tube 9 has an outer diameter of 28 mm (wall thickness: 1, 5 mm).
  • the outer tube 8 is also made of quartz glass and has an inner diameter of 51 mm (wall thickness: 2 mm).
  • the discharge space 6 thus has a radially uniform gap width of about 11, 5 mm.
  • the outer cylinder jacket of the outer tube 8 forms an outwardly facing, closed Abstrahlmantel phenomenon over which the UV working radiation passes to the outside, and the inner tube 9 forms the reflector outer surface in the context of the invention.
  • the operating current optimized for the same width of the discharge space and thus the number of UVC photon emitting atoms can be increased in comparison with conventional mercury low-pressure lamps, resulting in particularly high power, power density and efficiency of the UVC radiation Contributes that the UVC photons emitted in the direction of the reflector layer 5, are reflected back and thus not completely lost.
  • the discharge space 26 is formed as an interrupted annular gap.
  • the discharge space 26 is composed of a multiplicity (in the exemplary embodiment: twelve) of cylindrical lamp modules 20, which are fixed in a frame on the front side in such a way that their cylinder longitudinal axes run parallel to the lamp longitudinal axis 27.
  • the lamp modules 20 form a radially interrupted, annular arrangement around the lamp unit longitudinal axis 27.
  • the lamp modules 20 are identically constructed mercury low-pressure lamps (amalgam lamps) with a conventional, cylindrical discharge space having a typical length of up to 2 m and a typical outside diameter in the range of 15 mm to 8 mm, in the exemplary embodiment an outside diameter of 22 mm.
  • the arrangement of the lamp modules 20 forms in cross-section (viewed in the direction of the lamp unit longitudinal axis 27) a radially interrupted annular ring with a clear width of about 20 mm, wherein the outwardly facing, indicated by the reference numeral 23 surface areas of the respective lamp modules 20 act as a radiating surface, and the opposing surface portions 24 as a reflector surface.
  • FIG. 3 shows a further embodiment of a lamp unit 3 with an interrupted discharge space 36.
  • the interrupted discharge space 36 is assembled by four area radiators 30 arranged in the rectangle.
  • the surface radiators 30 are connected together, in the embodiment by gluing.
  • the cylinder longitudinal axes of the lamp modules 30 each extend parallel to the lamp unit longitudinal axis 37.
  • the surface radiators 30 are identically constructed low-pressure mercury lamps (amalgam lamps) each having a rectangular discharge space with the dimensions 12 mm ⁇ 28 mm (height ⁇ width) and with a typical length of 1 m to 2 m, in the exemplary embodiment 1, 5 m.
  • the outwardly facing surface regions 33 act as a radiating surface and the opposing surface regions 34 as a reflector surface.
  • the reflector is formed by an aluminum hollow profile 35 with an edge length of about 30 mm, against which the lamp modules 30.
  • FIG. 4 shows a further embodiment of a lamp unit 4 according to the invention, which is essentially formed from an amalgam lamp 40 with a circumferential, annular-gap-shaped discharge space 46 and a reflector 45.
  • the discharge space 46 is formed as an annular gap between an outer tube 8 and an inner tube 9 inserted therein coaxially with the lamp unit longitudinal axis 47.
  • the lamp unit 4 differs from the embodiment explained with reference to FIG. 1 only in that the reflector 45 is provided on the cylinder jacket surface of the outer tube 8 facing away from the discharge space 46.
  • the reflector 45 is in the form of a 0.5 mm thick layer of opaque, synthetic quartz glass (the thickness of the reflector layer 45 is exaggerated in size).
  • the outer cylinder jacket of the outer tube 48 therefore forms the reflector outer surface in the context of the invention and the inner tube 9 forms an inwardly directed, closed Abstrahlmantel phenomenon over which the UV working radiation exits to the inside.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

L'invention concerne un ensemble de lampe comprenant une lampe à vapeur de mercure à basse pression et un réflecteur, un espace de décharge renfermant un gaz de remplissage s'étendant le long d'un axe longitudinal d'un ensemble de lampe. Dans le but d'obtenir un ensemble de lampe d'une puissance et d'une puissance volumique particulièrement élevées, ainsi qu'une grande efficacité de rayonnement UVC, l'invention est caractérisée en ce que l'espace de décharge forme une fente annulaire périphérique (6) ou une fente annulaire interrompue qui est limitée par une surface latérale de rayonnement (8) et par une surface latérale de réflecteur (9) à laquelle est associé le réflecteur (5).
EP10722938A 2009-06-17 2010-05-17 Ensemble de lampe Withdrawn EP2443648A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009025667A DE102009025667A1 (de) 2009-06-17 2009-06-17 Lampeneinheit
PCT/EP2010/002999 WO2010145739A1 (fr) 2009-06-17 2010-05-17 Ensemble de lampe

Publications (1)

Publication Number Publication Date
EP2443648A1 true EP2443648A1 (fr) 2012-04-25

Family

ID=42735360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10722938A Withdrawn EP2443648A1 (fr) 2009-06-17 2010-05-17 Ensemble de lampe

Country Status (4)

Country Link
US (1) US20120086324A1 (fr)
EP (1) EP2443648A1 (fr)
DE (1) DE102009025667A1 (fr)
WO (1) WO2010145739A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2641262B1 (fr) * 2010-11-16 2014-06-25 Koninklijke Philips N.V. Dispositif de lampe à décharge d'arrêt diélectrique et dispositif de traitement de fluide optique équipé du dispositif de lampe à décharge d'arrêt diélectrique
JP2014004506A (ja) * 2012-06-22 2014-01-16 Ushio Inc 流体処理装置
DE102012219064A1 (de) 2012-10-19 2014-04-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. UV-Lichtquelle mit kombinierter Ionisation und Bildung von Excimern
WO2015038433A1 (fr) * 2013-09-11 2015-03-19 Heraeus Noblelight Fusion Uv Inc. Source uv à uniformité élevée dans une grande zone utilisant de nombreux petits émetteurs
DE102014207688A1 (de) 2014-04-24 2015-10-29 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung zur photochemischen Behandlung von verunreinigtem Wasser
DE102014207690A1 (de) 2014-04-24 2015-10-29 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung zur photochemischen Behandlung oder Reinigung eines flüssigen Mediums

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Also Published As

Publication number Publication date
DE102009025667A1 (de) 2010-12-23
US20120086324A1 (en) 2012-04-12
WO2010145739A1 (fr) 2010-12-23

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