WO1979000179A1 - Guide de lumiere ne pouvant etre traverse disruptivement par le feu - Google Patents

Guide de lumiere ne pouvant etre traverse disruptivement par le feu Download PDF

Info

Publication number
WO1979000179A1
WO1979000179A1 PCT/CH1978/000022 CH7800022W WO7900179A1 WO 1979000179 A1 WO1979000179 A1 WO 1979000179A1 CH 7800022 W CH7800022 W CH 7800022W WO 7900179 A1 WO7900179 A1 WO 7900179A1
Authority
WO
WIPO (PCT)
Prior art keywords
light guide
fiber
bushing
lead
piece
Prior art date
Application number
PCT/CH1978/000022
Other languages
German (de)
English (en)
Inventor
R Menningen
K Schneider
E Stalder
Original Assignee
Hectronic Ag
R Menningen
K Schneider
E Stalder
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 Hectronic Ag, R Menningen, K Schneider, E Stalder filed Critical Hectronic Ag
Publication of WO1979000179A1 publication Critical patent/WO1979000179A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2476—Non-optical details, e.g. housings, mountings, supports
    • G02B23/2484—Arrangements in relation to a camera or imaging device
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4415—Cables for special applications
    • G02B6/4427—Pressure resistant cables, e.g. undersea cables
    • G02B6/4428—Penetrator systems in pressure-resistant devices

Definitions

  • the invention relates to a flame-arresting light guide bushing in a boundary between an endangered and a less or not endangered zone, in which each light guide in an approved material is guided to a certain length while maintaining a certain maximum gap width and in the less or not endangered Zone for ventilation is exposed over a certain minimum distance.
  • Photoelectric devices are often used to monitor processes in potentially explosive rooms and operating systems, such as filling up burning fuel tanks. Since the placement of electrical light sources in the endangered zone is too dangerous due to the possibility of sparking, the required light must be introduced from outside into the endangered zone and, if necessary, led out of it again. Regulations for guiding the light guides that are preferably used for this purpose through the zone boundary are compiled, for example, in VDE 170 / VDE 171. According to these, only certain materials are permitted for the production of a bushing, such as steel, stainless steel, brass and other non-ignitable alloys, ie no aluminum, no magnesium etc., ceramics, resistant, corrosion-resistant plastics, e.g. polytetrafluoroethylene (Teflon) etc.
  • Teflon polytetrafluoroethylene
  • the implementation in a plastic must also be gas-tight.
  • the light guide must be enclosed in a hole, the diameter of which is limited to a certain maximum value depending on the explosion class of the medium present in the endangered zone (diameter 0.6 mm for explosion class d 3; 1.2 mm for class 2; 2 .0 mm for class 1) and their length in metal and ceramics must be at least 25 mm and in plastic at least 40 mm.
  • the bundle of ordered or disordered optical fibers is surrounded with a cladding and covered with a protective sheath, e.g. made of Teflon.
  • the diameter of such a wrapped fiber bundle can e.g. 055 mm.
  • fiber-optic cables have considerable disadvantages for the production of a proper implementation, since it is practically impossible to guarantee the permitted maximum gap width of 0.1 mm because of the capillary spaces between the fibers.
  • the known light rods are better suited for implementation, but they are too sensitive to mechanical influences and, above all, cannot be used to cover larger distances with strongly and multiply curved light paths.
  • the light guide bushing according to the invention is characterized in that a lead-through body made of approved lead-through material that closes an opening of the zone boundary and can be fastened to the boundary contains a single-fiber light guide piece guided in a separate longitudinal bore and the lead-through body for ventilation has a length of at least the certain guide length Distance from its one end face has a transverse hole in which each single-fiber light guide piece is exposed, and carries an optical plug on each of its two end faces for connecting further light guides.
  • the further light guides can be fiber bundle light guides, whereby each single-fiber light guide piece of the lead-through body can consist of an optical fiber, to which a fiber of a light guide fiber bundle can then be connected, or of an optical fiber, to which a fiber light guide can be made
  • the lead-through body can preferably be provided with external threads, in order, for example, to attach device housings or protective tubes for further light guides in a simple manner by means of union nuts, and to be able to fasten the lead-through body itself to the zone boundary by means of a screw connection corresponding to the regulations , for example a tank wall, but can also carry a tubular extension, at the end of which the bushing body can be fastened, for example, by means of a union nut such an easy-to-use coupling component, which can be adapted without difficulty to the particular features in each case, such as the number of light guides to be carried out, their permissible maximum diameter, etc.
  • the long bores of small diameters Cmaximal 0, S mm) required in bushings with explosion class d3 media can only be produced with great effort in the precision required for the permissible gap width of at most 0.1 mm.
  • the light guide pieces are therefore preferably precise.
  • Inserted tubes that are easy to manufacture with the desired accuracy or are commercially available as drawn or calibrated tubes.
  • the lead-through body For the reception of the light guide pieces enclosed in insert tubes, the lead-through body then contains bores corresponding to larger diameters, which can be drilled without difficulty with the required accuracy.
  • the light guide pieces can also be cast or sintered into such large bores of the lead-through body, with the casting material being, for example. Brass and sintered metal or sintered ceramic is selected as the sintered material. Since the filling of the wide bores in the lead-through body corresponds to a production of the "insert tubes" on site, they need
  • Fig. La and 1b a longitudinal or cross section through a light guide implementation used in a tank wall as a zone delimitation according to the invention with four light guides and
  • Fig. 2 a longitudinal section through a light guide bushing which is screwed onto a tube inserted in a tank wall.
  • the light guide bushing shown in FIGS. La and 1b which is designated overall by 1, consists of an essentially cylindrical bushing body 2 of a dimension approved for such bushings in accordance with VDE 170 / VDE 171 material, for example made of a non-ignitable metal (steel, stainless steel, brass) or ceramic.
  • the lead-through body 2 has a transverse hole 5 in the vicinity of its lower end face 3 in the drawing, which has a diameter of at least 10 mm and for ventilation At this (lower) end, the lead-through body 2 carries a cap nut 6 which is supported on a support ring 7 inserted into the lead-through body 7.
  • the lower section of the lead-through body 2 containing the transverse hole 5 becomes “ventilated part” 2b and the adjoining part
  • the upper section of the bushing body is called “flame-arresting part” 2a.
  • the flame-arresting part 2a is so long that the minimum gap length required for bushings in VDE 170 / VDE 171 is guaranteed.
  • bushing body 2 contains a cylindrical or prismatic recess 8 for receiving an optical connector that will be described later.
  • the flame-arresting part 2a of the lead-through body is provided with an external thread 9 and, as FIG.
  • FIGS. 1 a and 1 b show, screwed into a screw nut 41 inserted gas-tight in the tank wall 40, which is at least 8 mm high according to the regulations (VDE 170 / VDE 171) and at least 5 threads has, a lock nut 42 ensures a firm fit of the lead-through body 2 in the tank wall.
  • the lead-through body 2 accordingly contains four axially parallel single-fiber light guide pieces 10, which, as is known, consist of thin and cladding glass rods coated with a lower refractive index.
  • the single-fiber light guide pieces 10 are contained in calibrated insert tubes 11a, 11b made of approved metal, ceramic or glass, the insert tubes 11a in the flame-retardant part
  • the purpose of the light guide bushing is to ensure that all electrical devices such as lighting devices, photoelectric converters etc. are outside the endangered zone, i.e. arranged outside the tank and only completely safe components such as mirrors, deflection prisms, filters etc. can be provided in the tank.
  • the light guide pieces 10 of the bushing are therefore to be connected to light guides which lead to the relevant devices or devices and which can be of any length according to the respective circumstances.
  • the further light guides can be relatively short and straight, such as inside the tank, they can consist of light guide rods.
  • fiber bundle light guides or light guide cables are expediently used for the further light guides.
  • the further light guides are connected to the single-fiber light guide pieces 10 of the bushing via optical connectors.
  • a further light guide 13a for example light guide rods, is attached to the end face 4 of the lead-through body 2 located in the tank.
  • the extension pipe 14 consists, for example, of stainless steel and is closed off by a flat end plate 15 projecting beyond the pipe circumference, so that it is pressed onto the end face 4 of the lead-through body 2 by means of a cap nut 16 that can.
  • the end plate 15 is equipped with four sleeves 17 which are dimensioned so that, when the tube 14 is correctly fitted, they fit exactly onto the ends of the insert tubes 11a projecting into the recess 8.
  • the further light guides 13a are inserted into the sleeves 17.
  • the recess 8 contains a guide body 18 made of a material approved for bushings of this type, which contains four axially parallel through-bores 19 aligned with the light guide pieces 10.
  • the openings of the bores 19 are flared, so that once the guide body 18 is inserted into the recess 8, the projecting ends of the insert tubes 11a and, on the other hand, when the tube 14 is attached, the sleeves 17 are aligned and guided. In this way, easy and effortless assembly and reliable optical contact of the light guide pieces 10 with the further light guides 13a are ensured.
  • an optical fiber cable of which only fiber bundle optical fibers 13b are shown, is attached to the other side of the optical fiber pieces 10.
  • the end of the light guide cable is inserted into a one-piece cable end piece 20, for example made of stainless steel, which is designed similarly to the end of the lead-through body 2 containing the recess 8, that is to say has an external thread 21 for screwing on the above-mentioned nut 6 and a cylindrical or prismatic recess 22 contains, which is preferably dimensioned like the recess 8 and project from the bottom 22a sleeves 23, the. fit on the ends of the insert tubes 11b.
  • the recess 22 contains the guide body 24, which is designed in the same way as the guide body 18.
  • Fig. La the light guide bushing 1 must be installed in the hazardous area. If the endangered zone is the inside of a tank, it can be difficult to attach the light guide bushing the.
  • Fig. 2 shows an embodiment variant ⁇ in which the assembly can take place completely outside the endangered zone.
  • the further one is in an opening 43 of the tank wall 40
  • Tube 25 containing light guide 13a is used, which consists of stainless steel (wall thickness at least 1 mm) or of ordinary steel (wall thickness at least 3 mm).
  • the opening 43 is enclosed by a screw nut 41, e.g. welded into which a tube support 26 dimensioned for receiving the tube 25 is screwed.
  • a wedge ring 27 made of stainless steel or Teflon is inserted into the tube support 26 and is pressed through a hollow screw 28 which surrounds the tube 25 and is screwed into the tube support 26. This attachment corresponds to the regulations for pipe penetrations in hazardous areas.
  • An intermediate piece 30 is screwed onto the external thread 29 at the end of the tube 25 and serves a flange 31 as a counter-bearing for a cap nut 34 that fits onto the external thread 9 of the lead-through body 2.
  • the intermediate piece 30 On its end face 32, the intermediate piece 30 contains a recess 33 which is wider than the recess 8 in the lead-through body 2.
  • a plug plate 35 is inserted into the recess 33 and, like the end plate 15 in FIG.
  • the plug plate 35 with the sleeves 36 is made in one piece.
  • the ends of the further light guides 13a in the tube 25 are inserted through holes 37 in the connector plate in the sleeves 36. 2 corresponds to the embodiment shown in FIG. La.
  • the single-fiber light guide pieces 10 are cast or sintered into longitudinal bores, their end faces end in the end face 3 or in the bottom face 8a of the recess 8 and the sleeves of the optical connectors are correspondingly longer.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Astronomy & Astrophysics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

Des guides de lumiere ne pouvant etre traverses disruptivement par le feu sont necessaires pour la surveillance optique et/ou optoelectrique, par exemple de grandeurs d'etat physiques et chimiques dans des procedes, dans des zones avec risques d'explosion. Dans ce but, chaque guide de lumiere dans la region a risques est execute en une seule fibre dans sa propre ouverture longitudinale, suffisamment petite, et est ensuite mis a l'air, sans support, dans une region sans risques ou a risques moindres, Dans une variante d'execution technique economique, on emploie pour cela des petits tubes (11a, 11b) d'une longueur superieure a 25 mm et de preference d'un calibre de 6 mm. Dans une autre variante, les guides de lumiere sont coules dans les ouvertures (12a, 12b).
PCT/CH1978/000022 1977-10-05 1978-10-02 Guide de lumiere ne pouvant etre traverse disruptivement par le feu WO1979000179A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1216577 1977-10-05
CH12165/77 1977-10-05

Publications (1)

Publication Number Publication Date
WO1979000179A1 true WO1979000179A1 (fr) 1979-04-19

Family

ID=4380493

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1978/000022 WO1979000179A1 (fr) 1977-10-05 1978-10-02 Guide de lumiere ne pouvant etre traverse disruptivement par le feu

Country Status (8)

Country Link
DE (1) DE2857094D2 (fr)
FR (1) FR2405489A1 (fr)
GB (1) GB2023869A (fr)
IT (1) IT1099238B (fr)
NL (1) NL7809900A (fr)
SE (1) SE7904845L (fr)
WO (1) WO1979000179A1 (fr)
ZA (1) ZA785381B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2520124A1 (fr) * 1982-01-21 1983-07-22 Silec Liaisons Elec Element de traversee de cloison de coffret anti-deflagrant pour fibre optique
EP0105198A2 (fr) * 1982-09-07 1984-04-11 Siemens Aktiengesellschaft Passe-cloison résistant à la pression et hermétique aux gaz pour guide d'onde optique
FR2546308A1 (fr) * 1983-05-20 1984-11-23 Lignes Telegraph Telephon Traversee etanche pour fibres optiques
DE4038248A1 (de) * 1990-11-30 1992-06-04 Hansen & Reinders Gmbh & Co Be Gehaeusedurchfuehrung fuer lichtleiter
DE19756876A1 (de) * 1997-12-19 1999-04-15 Siemens Ag Durchführung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2244816A (en) * 1990-04-10 1991-12-11 Microphax Limited Illumination apparatus for a microfiche reader

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3051035A (en) * 1960-05-17 1962-08-28 American Optical Corp Flexible pyroscopes
FR1534959A (fr) * 1967-06-23 1968-08-02 Commissariat Energie Atomique Conducteurs de lumière à vide intérieur
US3552821A (en) * 1967-09-05 1971-01-05 Exxon Research Engineering Co Borescope for use at high temperatures and pressures
US3618526A (en) * 1969-09-26 1971-11-09 Us Navy Pyrotechnic pumped laser for remote ordnance initiation system
US3690775A (en) * 1971-09-01 1972-09-12 Avco Corp Borescope fixture
US3825320A (en) * 1973-03-02 1974-07-23 Us Navy High-pressure optical bulkhead penetrator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3051035A (en) * 1960-05-17 1962-08-28 American Optical Corp Flexible pyroscopes
FR1534959A (fr) * 1967-06-23 1968-08-02 Commissariat Energie Atomique Conducteurs de lumière à vide intérieur
US3552821A (en) * 1967-09-05 1971-01-05 Exxon Research Engineering Co Borescope for use at high temperatures and pressures
US3618526A (en) * 1969-09-26 1971-11-09 Us Navy Pyrotechnic pumped laser for remote ordnance initiation system
US3690775A (en) * 1971-09-01 1972-09-12 Avco Corp Borescope fixture
US3825320A (en) * 1973-03-02 1974-07-23 Us Navy High-pressure optical bulkhead penetrator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM Technical Disclosure Bulletin, Vol. 14, No. 3, August 1971, "Connector mount for fiber optic bundle", E.L. Millet:, Seite 725-726 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2520124A1 (fr) * 1982-01-21 1983-07-22 Silec Liaisons Elec Element de traversee de cloison de coffret anti-deflagrant pour fibre optique
EP0105198A2 (fr) * 1982-09-07 1984-04-11 Siemens Aktiengesellschaft Passe-cloison résistant à la pression et hermétique aux gaz pour guide d'onde optique
EP0105198A3 (fr) * 1982-09-07 1985-10-23 Siemens Aktiengesellschaft Passe-cloison résistant à la pression et hermétique aux gaz pour guide d'onde optique
FR2546308A1 (fr) * 1983-05-20 1984-11-23 Lignes Telegraph Telephon Traversee etanche pour fibres optiques
DE4038248A1 (de) * 1990-11-30 1992-06-04 Hansen & Reinders Gmbh & Co Be Gehaeusedurchfuehrung fuer lichtleiter
DE19756876A1 (de) * 1997-12-19 1999-04-15 Siemens Ag Durchführung

Also Published As

Publication number Publication date
GB2023869A (en) 1980-01-03
ZA785381B (en) 1979-09-26
FR2405489A1 (fr) 1979-05-04
NL7809900A (nl) 1979-04-09
SE7904845L (sv) 1979-06-01
IT7828445A0 (it) 1978-10-05
DE2857094D2 (en) 1980-11-20
IT1099238B (it) 1985-09-18

Similar Documents

Publication Publication Date Title
DE2616920A1 (de) Kupplung zum verbinden von lichtleitern
CH651398A5 (de) Aus zwei hermaphroditischen elementen bestehender steckverbinder fuer lichtleitfasern.
DE102013102886A1 (de) Aufsteckwinkel für einen Steckverbinder
WO1979000179A1 (fr) Guide de lumiere ne pouvant etre traverse disruptivement par le feu
DE3833492C2 (de) Vorrichtung und Verfahren zum Aufteilen von Lichtwellenleitern eines optischen Kabels
EP0199267B1 (fr) Connecteur pour guide d'ondes
DE4410444C2 (de) LWL-Stecker
EP2013651A1 (fr) Prise de câble à fibres optiques
DE4304545C2 (de) Kabel mit Lichtwellenleitern
DE2511019A1 (de) Grundelement zum aufbau optischer kabel
DE7908489U1 (de) Flammdurchschlagsichere lichtleiter- durchfuehrung
DE4009625A1 (de) Kabeldurchfuehrung
DE3103235A1 (de) Universalmuffe fuer fernverbindungs- bzw. energiekabel
EP0813076B1 (fr) Dispositif de protection sans contact, en particulier barrière de lumière
DE19830148C5 (de) Anschlußelement für ein Lichtwellenleiterkabel
DE1229748B (de) Faseroptisches Kabel
DE2810762C3 (de) Kupplung für ein Lichtleiterkabel mit verschiedenen opto-elektronischen Wandlerelementen
DE3806268C2 (fr)
DE3743483A1 (de) Lichtwellenleiter-steckverbindung mit zugeordneten schutzkappen
DE3824648C2 (fr)
EP0472676B1 (fr) Cable de transmission de signaux
DE3132408C2 (fr)
DE8113501U1 (de) Lichtwellenleiter enthaltende, druckgasüberwachte Kabelanordnung mit Verbindungsmuffe
DE4038248C2 (fr)
DE4106591C2 (fr)

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): CH DE GB JP SE US

REF Corresponds to

Ref document number: 2857094

Country of ref document: DE

Date of ref document: 19801120

Format of ref document f/p: P