EP1975976A1 - Lampe de décharge à vapeur de mercure basse pression pour désinfecter un milieu - Google Patents

Lampe de décharge à vapeur de mercure basse pression pour désinfecter un milieu Download PDF

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Publication number
EP1975976A1
EP1975976A1 EP07104972A EP07104972A EP1975976A1 EP 1975976 A1 EP1975976 A1 EP 1975976A1 EP 07104972 A EP07104972 A EP 07104972A EP 07104972 A EP07104972 A EP 07104972A EP 1975976 A1 EP1975976 A1 EP 1975976A1
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
discharge
vessel
lamp according
foregoing
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.)
Ceased
Application number
EP07104972A
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German (de)
English (en)
Inventor
designation of the inventor has not yet been filed The
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP07104972A priority Critical patent/EP1975976A1/fr
Priority to PCT/IB2008/051077 priority patent/WO2008117224A1/fr
Publication of EP1975976A1 publication Critical patent/EP1975976A1/fr
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
    • H01J61/523—Heating or cooling particular parts of the lamp
    • 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
    • H01J61/34—Double-wall vessels or 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

Definitions

  • the invention relates to a low-pressure mercury vapour discharge lamp for disinfecting a medium.
  • UV light in particular UV-C light
  • UV light or UV lamps are commonly used in heating, ventilation, and air conditioning systems for purification or air cleaning purposes.
  • UV lamps are typically installed or mounted in the air ducts of air conditioning systems in such a manner that the UV light emitted by the lamp floods the interior of the air duct. Air flowing through that duct will be irradiated with UV radiation which will have a germicidal or bactericidal effect on the moving air thereby reducing the impurities in the air flow.
  • Low-pressure mercury vapour discharge lamps such as Compact Fluorescent Lamps (“CFLs"), e.g. bitubular fluorescent lamps, are commonly very suitable to generate light with appropriate wavelengths for disinfection purposes.
  • CFLs Compact Fluorescent Lamps
  • the light output of low-pressure mercury vapour discharge lamps is critically dependent upon mercury vapour pressure (vapour density) within a discharge vessel of the lamp.
  • the luminous efficacy of a mercury vapour discharge lamp changes according to the mercury-vapour pressure in the lamp.
  • the mercury vapour atoms efficiently convert electrical energy to ultraviolet radiation with a typical wavelength of 253.7 nm when the mercury vapour pressure is in the proper range.
  • the mercury-vapour pressure is controlled by the temperature of a cold spot, which is the coldest region of the discharge lamp during lamp operation.
  • the ambient temperature can be relatively low (commonly between 5° and 15° Celsius), but also the air velocity is such that the cold spot temperature decreases to values far below an optimum of approximately 42° Celsius for most typical low-pressure mercury vapour discharge lamps.
  • the output is much lower than the maximum achievable output of the lamp, which leads to a considerable inefficiency of the known low-pressure discharge lamps.
  • a low-pressure mercury vapour discharge lamp comprising: a discharge vessel filled with a mercury comprising substance, multiple electrodes connected to said vessel, between which electrodes a discharge extends during lamp operation, and covering means for a position selective covering of a cold spot region of the discharge vessel.
  • a relatively cool medium compared to the temperature of the cold spot of the discharge vessel
  • the covering means being position selectively applied to the discharge vessel act in a passive manner, meaning that the covering means are not employed to be powered by an external power source (other than eventually the discharge lamp itself), which makes the application of the covering means relatively simple and cheap.
  • the discharge lamp according to the invention is suitable for disinfecting both gas, in particular air, and liquids, in particular water, or mixtures of a gas and a liquid.
  • the covering means may employ various characteristics.
  • the covering means are at least partially made of a thermally insulating material to preclude, or at least to counteract, heat transfer by the cold spot of the discharge vessel to a surrounding medium to be disinfected as much as possible.
  • Possible thermally insulating materials to be applied are cork and polymers, such as polyurethane, polystyrene, wherein the polymer used may be foamed.
  • the covering means is adapted for absorbing heat generated within the vessel. In this way, the cold spot of the discharge vessel can be kept at a sufficiently high temperature by heat generated within the discharge vessel.
  • the covering means is adapted to convert electromagnetic radiation generated within the vessel into heat. By means of this conversion the temperature of the cold spot (region) can also be held at a sufficiently high temperature to secure an optimum light output.
  • the covering means comprises a photocatalytic oxidation material, as a result of which the covering means are not merely adapted to maintain the cold spot region of the discharge vessel at a sufficiently high temperature, but also to remove particular species, such as unwanted organic substances. Hence, in this way the covering means is provided an additional functionality.
  • the covering means is preferably at least partially made of a reflective material. More preferably a surface of the covering means facing the discharge vessel is made reflective at least partially. In this manner, electromagnetic radiation generated within the discharge vessel can be reflected within the cold spot region.
  • the reflective character of the coating may be dependent on the wavelength of the electromagnetic radiation generated within the vessel. Reflection of electromagnetic radiation may be beneficial either for heating the cold spot region due to reflection (and subsequent absorption) of IR radiation and/or for improving the light output of the discharge lamp.
  • the shape and dimensioning of the covering means may be of various nature.
  • the covering means comprises a coating applied to the cold spot region of the discharge vessel. The coating is preferably thermally conductive to achieve sufficient heating of the cold spot region of the discharge vessel.
  • a graphite coating and/or other suitable coatings such as e.g. a stamp pad ink based coating or a glass ink based coating, may be used.
  • the thermal conductivity of the coating will be larger than the thermal conductivity of glass (approx. 0.8-0.9 Wm -1 K -1 ).
  • the thermal conductivity of the coating is larger than 1 W/m/K, and more preferably over 10 Wm -1 K -1 .
  • a graphite coating will commonly have a thermal conductivity of approximately 150 Wm -1 K -1 .
  • a Compact Fluorescent Lamp which commonly comprises two discharge vessel parts mutually connected by means of a bridge, wherein the geometry of the bridge may be of various nature.
  • the cold spot (region) of the discharge vessel is commonly located near the bridge, dependent on the geometry of the bridge.
  • discharge vessel near (and/or at) the bridge is provided with a coating.
  • the covering means comprises at least one shielding element, commonly being relatively thick compared to a coating.
  • the shielding element is preferably adapted to enclose the extreme portion of the CFL (near the bridge), to commonly shield the cold spot region.
  • the shielding element is adapted to enclose the bridge at least partially, as a consequence of which the shielding element is preferably given more or less a cap shape.
  • the extreme portion of the discharge vessel is preferably shielded to since the cold spot region is commonly located at this extreme portion.
  • the shielding element is attached to the vessel. In this manner, an adequate shielding of the cold spot region can be secured.
  • the shielding element is sealed to the vessel. Separate sealing means may be applied. Shielding of the cold spot region can be further optimized in this manner.
  • the shielding element and the discharge vessel mutually enclose an air gap.
  • an air gap exhibits relatively good thermally insulating characteristics, applying an air gap could be applied very well to counteract cooling down of the cold spot region of the discharge vessel.
  • the coating and/or the shielding element could also be applied to (conventional) TL lamps, wherein the cold spot region is covered by the coating and/or the shield element.
  • the cold spot region of conventional TL lamps is located either in the centre of the lamp (between the electrodes) or behind the electrodes at an extreme section of the lamp.
  • the discharge vessel is commonly made of glass, in particular quartz glass. Glass is a thermally stable and transparent material. The glass discharge vessel is substantially left uncovered to achieve a maximum light output. Since the discharge lamp is adapted to disinfect a surrounding medium, a conventional phosphorous coating is omitted. In this manner, UV(-C) radiation will be emitted by the discharge vessel in order to inactivate micro-organisms and other impurities contained by the medium.
  • the discharge lamp according to the invention is suitable for disinfecting both air and water (or a mixture thereof).
  • the discharge lamp preferably comprises a sleeve surrounding the discharge vessel at least substantially. In this manner physical contact between the liquid to be disinfected and the lamp can be prevented, as a result of which the discharge lamp can be held relatively easily at an optimum operating temperature.
  • FIG. 1a shows a side view of a first embodiment of a low-pressure mercury vapour discharge lamp 1 according to the invention.
  • the discharge lamp 1 comprises an elongated light-transmissive discharge vessel 2 made of glass.
  • the discharge vessel 2 is provided with electrical contacts 3a, 3b at the extreme ends of the discharge vessel 2.
  • the discharge vessel 2 is filled with a mercury comprising substance, which will be ionised and discharged during lamp operation, as a result of which electromagnetic radiation, in particular UV radiation, will be emitted by the discharge vessel 2 for disinfection purposes.
  • the location of the cold spot (region) is well known, wherein the cold spot (region) is located in a centre part of the discharge vessel 2 between the electrical contacts 3a, 3b.
  • the cold spot region is located between the dashed lines.
  • the cold spot forms a critical part of the discharge lamp 1
  • the temperature of the cold spot determines the light output of the discharge lamp 1.
  • a temperature decrease of the cold spot will lead to a diminished light output, which will easily occur during disinfection of a relatively cold medium, such as water or air.
  • the discharge lamp 1 according to the invention has been improved covering the cold spot region of the discharge vessel 2 by a shielding element 4, while remaining parts of the discharge vessel 2 have been left uncovered.
  • the cold spot region is thermally insulated, as a result of which cooling down of the cold spot can be counteracted leading to an optimization of the light output of the discharge lamp 1.
  • FIG 1b shows a detailed cross-section of a critical part the discharge lamp 1 as shown in figure 1a .
  • the shielding element 4 at attached to the discharge vessel 2 by means of a seal 5.
  • the shielding element 4 and the discharge vessel 2 mutually enclose an air gap 6 to thermally insulate the cold spot region.
  • the shielding element 4 as such is preferably also made of a thermally insulating material such as plastic to further counteract cooling down of the cold spot region of the discharge vessel 2.
  • FIG. 2 shows a side view of a second embodiment of a discharge lamp 7 according to the invention.
  • the type of discharge lamp 7 shown in this figure is a CFL.
  • the discharge lamp 7 comprises two discharge vessel parts 8a, 8b which are mutually connected by means of a bridge 9 which in fact also makes part of the discharge vessel 8 as a whole.
  • the vessel parts 8a, 8b are connected to electrodes (not shown).
  • the discharge vessel 8 is filled with a mercury-rare gas atmosphere.
  • the cold spot region of the discharge vessel 8 is located at an extreme end of the discharge vessel 8 near the bridge 9. An estimated end of the cold spot region is indicated by the dashed line.
  • the cold spot region is shielded by applying a shielding cap 10 around the cold spot region to prevent, or at least to counteract, cooling down of the cold spot region.
  • the shielding cap 10 is at least partially made of a heat absorbing material. After heat absorption by the shielding cap 10, the shielding cap 10 will be able to actively heat the cold spot region which is in favour of the light output of the discharge lamp 10.
  • the shielding cap 10 could at least partially be made of material which is adapted to convert UV radiation into heat the achieve the same latter effect. Since the discharge lamp 7 will be used for disinfection purposes, it could be beneficial in case the shielding cap 10 is at least partially made of a photocatalytic oxidation material to inactivate micro-organisms surrounding the discharge lamp 7.
  • FIG. 3 shows a side view of a third embodiment of a discharge lamp 11 according to the invention.
  • the discharge lamp 11 comprises a discharge vessel 12.
  • the discharge vessel comprises two vessel parts 12a, 12b being mutually coupled by means of a bridge 13.
  • the discharge vessel 12 is coupled to electrodes (not shown).
  • the cold spot region of the discharge vessel 12, being defined as the region below the dashed horizontal line in this figure, has been coated by a thermally conductive coating 14, such as a graphite coating, by means of which coating 14 the cold spot region can be kept at a sufficiently high temperature to secure an optimum light output of the discharge lamp 11.
  • the discharge lamp 11 is adapted for disinfecting a medium, which may be air. However, it is also conceivable that the discharge lamp 11 is adapted to disinfect a liquid medium, such as water.
  • a sleeve 15 a positioned around the discharge vessel 12 to avoid physical contact between water and the discharge vessel 12, as a result of which an optimum discharge lamp operation temperature can be achieved relatively easily.
  • a sleeve 15 a positioned around the discharge vessel 12 to avoid physical contact between water and the discharge vessel 12, as a result of which an optimum discharge lamp operation temperature can be achieved relatively easily.

Landscapes

  • Apparatus For Disinfection Or Sterilisation (AREA)
EP07104972A 2007-03-27 2007-03-27 Lampe de décharge à vapeur de mercure basse pression pour désinfecter un milieu Ceased EP1975976A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07104972A EP1975976A1 (fr) 2007-03-27 2007-03-27 Lampe de décharge à vapeur de mercure basse pression pour désinfecter un milieu
PCT/IB2008/051077 WO2008117224A1 (fr) 2007-03-27 2008-03-21 Lampe à décharge à vapeur de mercure à basse pression servant à désinfecter un milieu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07104972A EP1975976A1 (fr) 2007-03-27 2007-03-27 Lampe de décharge à vapeur de mercure basse pression pour désinfecter un milieu

Publications (1)

Publication Number Publication Date
EP1975976A1 true EP1975976A1 (fr) 2008-10-01

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ID=38147952

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EP07104972A Ceased EP1975976A1 (fr) 2007-03-27 2007-03-27 Lampe de décharge à vapeur de mercure basse pression pour désinfecter un milieu

Country Status (2)

Country Link
EP (1) EP1975976A1 (fr)
WO (1) WO2008117224A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2478293A1 (fr) * 2009-09-16 2012-07-25 Auralight International AB Tube fluorescent compact pour espaces froids
DE102012209078A1 (de) * 2012-05-30 2013-12-05 Von Ardenne Anlagentechnik Gmbh Blitzlampe mit prismatischem Lampenkörper
RU198150U1 (ru) * 2020-02-17 2020-06-22 Общество с ограниченной ответственностью Производственная компания "Лаборатория импульсной техники" (ООО ПК "ЛИТ") Амальгамная газоразрядная лампа низкого давления для обеззараживания воздуха и поверхности

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021236413A1 (fr) 2020-05-18 2021-11-25 Wangs Alliance Corporation Éclairage germicide
US11027038B1 (en) 2020-05-22 2021-06-08 Delta T, Llc Fan for improving air quality

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066860A2 (fr) * 1981-06-04 1982-12-15 General Electric Company Réglage de la température pour une lampe de décharge à vapeur métallique
JPS63116353A (ja) * 1986-11-04 1988-05-20 Hitachi Ltd 温度センサ−付紫外線ランプ
US4751392A (en) * 1986-02-12 1988-06-14 Bbc Brown, Boveri & Company, Limited Apparatus for sterilizing liquids
DE4302852A1 (de) * 1993-02-02 1994-08-04 Gernot K Brueck UV-Hochleistungsröhre
WO1996031902A1 (fr) * 1995-04-05 1996-10-10 Wedeco Umwelttechnologie Wasser-Boden-Luft Gmbh Lampe a decharge a vapeur de mercure basse pression
US20040232846A1 (en) * 2002-01-16 2004-11-25 Joachim Fischer Amalgam-doped low mercury low-pressure uv irradiator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066860A2 (fr) * 1981-06-04 1982-12-15 General Electric Company Réglage de la température pour une lampe de décharge à vapeur métallique
US4751392A (en) * 1986-02-12 1988-06-14 Bbc Brown, Boveri & Company, Limited Apparatus for sterilizing liquids
JPS63116353A (ja) * 1986-11-04 1988-05-20 Hitachi Ltd 温度センサ−付紫外線ランプ
DE4302852A1 (de) * 1993-02-02 1994-08-04 Gernot K Brueck UV-Hochleistungsröhre
WO1996031902A1 (fr) * 1995-04-05 1996-10-10 Wedeco Umwelttechnologie Wasser-Boden-Luft Gmbh Lampe a decharge a vapeur de mercure basse pression
US20040232846A1 (en) * 2002-01-16 2004-11-25 Joachim Fischer Amalgam-doped low mercury low-pressure uv irradiator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2478293A1 (fr) * 2009-09-16 2012-07-25 Auralight International AB Tube fluorescent compact pour espaces froids
EP2478293A4 (fr) * 2009-09-16 2013-07-03 Auralight Int Ab Tube fluorescent compact pour espaces froids
DE102012209078A1 (de) * 2012-05-30 2013-12-05 Von Ardenne Anlagentechnik Gmbh Blitzlampe mit prismatischem Lampenkörper
DE102012209078B4 (de) * 2012-05-30 2014-01-16 Von Ardenne Anlagentechnik Gmbh Blitzlampe mit prismatischem Lampenkörper
RU198150U1 (ru) * 2020-02-17 2020-06-22 Общество с ограниченной ответственностью Производственная компания "Лаборатория импульсной техники" (ООО ПК "ЛИТ") Амальгамная газоразрядная лампа низкого давления для обеззараживания воздуха и поверхности

Also Published As

Publication number Publication date
WO2008117224A1 (fr) 2008-10-02

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