EP1307689B1 - Explosionsgeschützte beleuchtungsanordnung - Google Patents

Explosionsgeschützte beleuchtungsanordnung Download PDF

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Publication number
EP1307689B1
EP1307689B1 EP01974975A EP01974975A EP1307689B1 EP 1307689 B1 EP1307689 B1 EP 1307689B1 EP 01974975 A EP01974975 A EP 01974975A EP 01974975 A EP01974975 A EP 01974975A EP 1307689 B1 EP1307689 B1 EP 1307689B1
Authority
EP
European Patent Office
Prior art keywords
housing
air
light guide
light
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.)
Expired - Lifetime
Application number
EP01974975A
Other languages
English (en)
French (fr)
Other versions
EP1307689A1 (de
Inventor
Edwin Keijzer
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.)
IBG Fiber Optics BV
Original Assignee
IBG FIBER OPTICS BV
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 IBG FIBER OPTICS BV filed Critical IBG FIBER OPTICS BV
Publication of EP1307689A1 publication Critical patent/EP1307689A1/de
Application granted granted Critical
Publication of EP1307689B1 publication Critical patent/EP1307689B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/12—Flameproof or explosion-proof arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V31/00—Gas-tight or water-tight arrangements
    • F21V31/04—Provision of filling media

Definitions

  • the present invention relates to an explosion-proof lighting device which is suitable for lighting an area which is at risk of explosion, belonging to zone zero, comprising a housing, a light source which is situated in the housing, a light guide, one end of which is connected to the housing, a light head, which is arranged at the other end of the light guide, and a power supply to the housing in order to provide at least the light source with energy.
  • Zone zero is the zone which is most at risk.
  • the next zone is zone one.
  • the heat emitted by a lamp means that a light source of a lighting device must never be positioned in zone zero.
  • the light source may be positioned in zone one, provided that the housing is of explosion-proof design.
  • the light has to be carried in cold form to zone zero via a guide.
  • An example of a zone zero area is an aircraft wing, since this is where the fuel tanks of the aircraft are accommodated.
  • the technicians When inspection work is carried out in the wing, the technicians have to crawl into the wing. They are never allowed, for example, to take a torch with them. It is therefore necessary to position a light source at a distance from the aircraft wing and for the technicians to carry with them a light guide in order to be able to illuminate the wing on the inside. Light is always lost in a light guide, as a function of the material used and the length of the guide. It is therefore desirable for the light source to be arranged as close as possible to the areas which are to be illuminated, in order for the length of the light guide to be kept as short as possible and, as a result, to restrict the loss of light in the light guide.
  • An explosion-proof lighting device of the type described in the preamble is known from EP-A-0 533 987.
  • the light head and a part of the light guide which is connected thereto are brought into the zone zero area.
  • the housing and the other part of the light guide which is connected thereto is arranged outside the zone zero area.
  • the housing is of heavy design. This constitutes a drawback.
  • a lighting device of the type described in the preamble in which the housing is provided with an air feed line for feeding air, while the device is operating, to the housing from an air source which is at a distance from the housing, in order to maintain an excess pressure in the housing with respect to the environment.
  • zone zero and zone one of an area which is at risk of explosion are shown as separated from one another by a dashed line.
  • a housing 1, in which a light projector 2 is arranged, is located in zone one.
  • the housing 1 is preferably made from metal, in particular stainless steel.
  • the light source 3 is situated in the projector 2.
  • a light guide 4 is fitted in order to carry the light from the light source 3 to zone zero.
  • One end of the light guide 4 is arranged in the vicinity of the light source 3.
  • the light guide 4 is preferably a synthetic fibre-optic cable, but may also be a glass fibre-optic cable.
  • the light guide 4 is preferably surrounded by a wound or braided metal sheath.
  • the metal used is preferably stainless steel, but may also, for example, be copper.
  • the metal sheath is earthed, so that electrostatic charging of the light guide 4 is counteracted and any sparking is prevented.
  • the metal sheath is also used to protect the light guide 4 from damage.
  • the light guide 4 with its sheath may be flexible, such as a hose, so that the light guide 4 can even be used in a tight, complex space, such as for example an aircraft wing.
  • Another advantage is that a wound or braided sheath may be light-permeable, with the result that a person who is in a tight, complex space with the light guide can find his way back using the light guide, which emits light over its entire length.
  • the housing 1 is provided with a power supply line 6 for supplying energy for, inter alia, the light source 3, to the housing 1 from outside the area which is at risk of explosion.
  • the housing 1 is also provided with an air feed line 7 and an air outlet 8 with a restricted passage. Air is carried out of an area which lies outside the area which is at risk of explosion to the housing 1 via the air feed line 7, in order, by interacting with the air outlet 8, to keep the housing 1 at an excess pressure with respect to the environment.
  • This air may be derived from a compressor or from a compressed-air system.
  • the light projector 2 is provided with a fan 9, in order, inter alia, to cool the light source 3.
  • the housing 1 is also provided with a pressure-monitoring system.
  • This system comprises pressure sensors (not shown) for measuring the pressure in the housing 1.
  • the pressure-monitoring system also comprises a control unit 10 and a container 11 in which there is an emergency supply of compressed air. From the container 10, an air line 12 leads to the inside of the housing 1.
  • the air line 12 has a mouthpiece 13 which is directed onto the light source.
  • Valves 14 and 15 are fitted in the lines 7 and 12, respectively, which valves can adopt a position between a closed position and an open position. These valves 14 and 15 are preferably solenoid valves. A valve 16 is also fitted in the air outlet 8.
  • This switch 17 can be used to interrupt the supply of energy to the light source 3.
  • the control unit 10 is electronically connected to the valves 14, 15 and 16 and to the switch 17.
  • the pressure sensors are also electronically connected to the control unit 10.
  • the control unit 10 uses the valves 14 and 16 to control the flow of air and therefore the excess pressure in the housing 1. If, in the housing 1, the excess pressure disappears completely or partially with respect to the environment, with the pressure sensors measuring a significant drop in the pressure, the control unit 10 sends a control signal to the switch 17, with the result that the latter opens and the light source 3 is switched off.
  • a control signal is also sent to the valve 15, with the result that air is passed from the container 11, via the line 12, into the housing 1, so that the light source 3 is cooled directly and the excess pressure in the housing 1 is maintained as much as possible until the light source 3 has reached a sufficiently low temperature.
  • the disappearance of the excess pressure may be the result, for example, of a major air leak arising in the housing 1 or the failure of the regular air supply.
  • the light source 3 is also switched off in the event of an excessively high excess pressure in the housing 1.
  • the device When the device is started up, first of all air is circulated through the housing 1, in order to remove any hazardous gases which may be present in the housing 1, and an excess pressure is built up in the housing 1. Only then is the light source 3 ignited. The starting operation is also controlled by the control unit 10.
  • the lighting device it is possible for the device to be designed with a plurality of light guides.
  • the light head is illustrated as a type of spotlight, but it may also be of some other form, for example in striplight form.
  • the housing 1 with the light source 3 can be positioned in a zone one area, with the result that a zone zero area can be illuminated with a limited length of light guide 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Control Of Combustion (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Push-Button Switches (AREA)

Claims (13)

  1. Explosionssichere Beleuchtungsvorrichtung, die sich dazu eignet, einen Bereich zu beleuchten, in dem Explosionsgefahr besteht und der zur Zone 0 gehört, wobei sie ein Gehäuse (1), eine Lichtquelle (3), die sich in dem Gehäuse befindet, einen Lichtleiter (4), dessen eines Ende mit dem Gehäuse verbunden ist, einen Lichtkopf (5), der am anderen Ende des Lichtleiters angeordnet ist, und eine Stromzufuhr (6) zu dem Gehäuse umfasst, um wenigstens die Lichtquelle mit Energie zu versorgen, dadurch gekennzeichnet, dass das Gehäuse mit einer Luftzuführleitung versehen ist, die, wenn die Vorrichtung arbeitet, dem Gehäuse von einer Luftquelle, die sich in einem Abstand zu dem Gehäuse befindet, Luft zuführt, um einen Überdruck in dem Gehäuse in Bezug auf die Umgebung aufrechtzuerhalten.
  2. Vorrichtung nach Anspruch 1, wobei das Gehäuse mit einem Drucküberwachungssystem versehen ist.
  3. Vorrichtung nach Anspruch 2, wobei das Drucküberwachungssystem eine Einrichtung zum Messen des Drucks in dem Gehäuse sowie wenigstens einen Druckluftbehälter (11) mit einem Notvorrat an Druckluft, sowie eine Steuereinheit (10) umfasst.
  4. Vorrichtung nach Anspruch 2 oder 3, wobei das Drucküberwachungssystem so ausgelegt ist, dass bei einem Druckabfall in dem Gehäuse die Lichtquelle abgeschaltet wird.
  5. Vorrichtung nach Anspruch 3 oder 4, wobei das Drucküberwachungssystem so ausgelegt ist, dass bei einem Druckabfall in dem Gehäuse Druckluft aus dem Druckluftbehälter in das Gehäuse strömt.
  6. Vorrichtung nach einem der Ansprüche 3-5, wobei der Druckluftbehälter mit einer Leitung (12) für ausströmende Luft versehen ist, die auf die Lichtquelle gerichtet ist.
  7. Vorrichtung nach einem der vorangehenden Ansprüche, wobei der Lichtleiter flexibel ist.
  8. Vorrichtung nach einem der vorangehenden Ansprüche, wobei der Lichtleiter gebündelte Kunststofffasern umfasst.
  9. Vorrichtung nach Anspruch 7 oder 8, wobei der Lichtleiter von einer gewickelten Metallummantelung umgeben ist.
  10. Vorrichtung nach Anspruch 9, wobei die Metallummantelung des Lichtleiters lichtdurchlässig ist.
  11. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die Vorrichtung mit einem Druckluftsystem verbunden ist, um den Überdruck in dem Gehäuse aufrechtzuerhalten.
  12. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die Vorrichtung mit einem Kompressor verbunden ist, um den Überdruck in dem Gehäuse aufrechtzuerhalten.
  13. Verfahren zum Inspizieren eines Bereiches, in dem Explosionsgefahr besteht und der zur Zone 0 gehört, unter Verwendung einer Vorrichtung nach einem der vorangehenden Ansprüche, wobei der Lichtleiter mit dem Lichtkopf in Zone 0 eingesetzt wird und das Gehäuse außerhalb dieser Zone angeordnet ist.
EP01974975A 2000-08-08 2001-08-08 Explosionsgeschützte beleuchtungsanordnung Expired - Lifetime EP1307689B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1015890A NL1015890C2 (nl) 2000-08-08 2000-08-08 Explosieveilige verlichtingsinrichting.
NL1015890 2000-08-08
PCT/NL2001/000593 WO2002012787A1 (en) 2000-08-08 2001-08-08 Explosion-proof lighting device

Publications (2)

Publication Number Publication Date
EP1307689A1 EP1307689A1 (de) 2003-05-07
EP1307689B1 true EP1307689B1 (de) 2006-05-03

Family

ID=19771858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01974975A Expired - Lifetime EP1307689B1 (de) 2000-08-08 2001-08-08 Explosionsgeschützte beleuchtungsanordnung

Country Status (6)

Country Link
EP (1) EP1307689B1 (de)
AT (1) ATE325308T1 (de)
AU (1) AU2001294346A1 (de)
DE (1) DE60119334D1 (de)
NL (1) NL1015890C2 (de)
WO (1) WO2002012787A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014105641A1 (de) * 2014-04-22 2015-10-22 Jörg Pagels Explosionsgeschützte elektrische Vorrichtung sowie eine hierfür bestimmte Trenneinrichtung zur Unterbrechung der Energieversorgung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2966903A1 (fr) * 2010-10-29 2012-05-04 Wat Cie Disposition d'eclairage securitaire
AT510287B1 (de) * 2010-11-18 2012-03-15 Rosenitsch Harald Ing Led-sicherheitsleuchte
US9488342B2 (en) 2013-09-25 2016-11-08 Elm, Inc. Underwater lighting device and underwater electronic device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3673424A (en) * 1971-02-12 1972-06-27 Nasa Pressurized lighting system
DE2436378A1 (de) * 1974-07-27 1976-02-19 Stahl R Fa Explosionsgeschuetzte, tragbare leuchte fuer die zone null
US4937717A (en) * 1988-06-09 1990-06-26 Betzvog Jr John M Lighting system for hazardous areas
US4961111A (en) * 1989-07-21 1990-10-02 Safe T. V., Inc. Video inspection system for hazardous environments
EP0533987A1 (de) 1991-09-27 1993-03-31 Friedrich Horst Papenmeier Fassleuchte
US5333226A (en) * 1992-03-23 1994-07-26 Gregg Stephens Fiber optic sculptural art and method of making same
US5539624A (en) * 1995-01-17 1996-07-23 Durodyne, Inc. Illuminated hose

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014105641A1 (de) * 2014-04-22 2015-10-22 Jörg Pagels Explosionsgeschützte elektrische Vorrichtung sowie eine hierfür bestimmte Trenneinrichtung zur Unterbrechung der Energieversorgung

Also Published As

Publication number Publication date
NL1015890C2 (nl) 2002-02-12
DE60119334D1 (de) 2006-06-08
EP1307689A1 (de) 2003-05-07
AU2001294346A1 (en) 2002-02-18
ATE325308T1 (de) 2006-06-15
WO2002012787A1 (en) 2002-02-14

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