EP0433003A1 - Assemblage d'interface pour cloison coupe-feu en milieu explosif - Google Patents

Assemblage d'interface pour cloison coupe-feu en milieu explosif Download PDF

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Publication number
EP0433003A1
EP0433003A1 EP90313414A EP90313414A EP0433003A1 EP 0433003 A1 EP0433003 A1 EP 0433003A1 EP 90313414 A EP90313414 A EP 90313414A EP 90313414 A EP90313414 A EP 90313414A EP 0433003 A1 EP0433003 A1 EP 0433003A1
Authority
EP
European Patent Office
Prior art keywords
boundary
interface assembly
insert
flame path
pin
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Withdrawn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
EP90313414A
Other languages
German (de)
English (en)
Inventor
John David Sowerby
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.)
C M P (UK) Ltd
Original Assignee
C M P (UK) Ltd
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 C M P (UK) Ltd filed Critical C M P (UK) Ltd
Publication of EP0433003A1 publication Critical patent/EP0433003A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/527—Flameproof cases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
    • H01H9/042—Explosion-proof cases
    • H01H9/043—Explosion-proof cases with pressure-relief devices

Definitions

  • This invention relates to interface assemblies for components passing through a boundary.
  • Connectors for potentially explosive environments are known in which the connecting pins are mounted in a plastics moulding.
  • the connector is mounted in a bulkhead or other boundary sealing off the source of ignition.
  • As the pins are designed to be capable of removal and replacement, there is a clearance between the moulding and the pins to enable removal of the pins.
  • This clearance constitutes a flame path by which flame can propagate from one side of the boundary to the other. Therefore, it is important that the dimensions of the flame path are small enough to stifle any flame before it reaches the other side.
  • British Standard BS 5501 sets the test for enclosures of greater than 100 cm3 having at least one face of plastics material, by which the reliability of a flame path therein can be measured. It requires that the flame path through the enclosure is able to withstand at least 50 controlled explosions subjecting the flame path to a propagating flame without experiencing erosion of the flame path sufficient to render the flame path ineffective.
  • an interface assembly for at least one element passing through an aperture in a boundary, including a first member mounted in the aperture; the or each element and the first member, and/or the first member and the boundary, defining a flame path or paths across the boundary, at least the first member being provided with a wear resistant insert in at least part of the region or regions defining the or each flame path.
  • the assembly may be arranged such that the member mounted in the aperture is removable, the element or elements being fixed and sealed in the first member.
  • the element(s) may be removably mounted in the first member.
  • the flame path can be arranged to be between the boundary and the first member.
  • the flame path can be arranged to be between the first member and the element.
  • the insert is a circular ferrule, or sheath which, together with the adjacent surface of the boundary and/or the adjacent surface of the element, defines an annular flame path from one side of the boundary to the other.
  • the insert may be either metal or, possibly, made of a ceramic material, or any sufficiently hard wearing material suitable for the purpose. In any event, it should be a material which is able to resist wear significantly better than the plastics material of which the first member mounted in the boundary will commonly be formed.
  • a typical plastics material for the first member is a dough moulding compound (d.m.c.) of polyester or an epoxy.
  • the present invention is incorporated in a cable connector having metal contact pins which are mounted in a plastics first member and project from the boundary in which the first member is mounted.
  • the flame path is defined between each pin and the surrounding plastics material.
  • the insert is made in the form of a cylindrical collar or sheath between at least part of the length of each pin and an adjacent portion of the plastics material.
  • the insert is received in a radially extending recess in the plastics material in order that it lies flush with it.
  • the assembly is intended to comply with BS 5501 and it is preferable, in this regard, if the dimensions and wear resistivity of the material of the insert are sufficient for this purpose.
  • the invention also extends to an enclosure incorporating an assembly according to the invention.
  • an electrical connector comprises a plastics connector body 10 which is formed with an aperture 11.
  • a brass connector pin 12 protrudes from one end of the aperture 11. Inside the aperture 11 the pin 12 is connected to one end of a cable 14. Generally mid-way between the ends of the aperture 11, the pin 12 is formed with a radially extending brass head portion 16.
  • the pin 12 may be held in place by, for example, grub screws which are threadedly received in radially extending holes in the plastics body 10 which bite on the shank of the pin to hold it in place.
  • the cable 14 may be secured in a recess in the head portion 16 by, for example, a grub screw threadedly received in the head portion 16.
  • grub screws which are threadedly received in radially extending holes in the plastics body 10 which bite on the shank of the pin to hold it in place.
  • the cable 14 may be secured in a recess in the head portion 16 by, for example, a grub screw threadedly received in the head portion 16.
  • there are other forms of securement of the pin 12 to the body 10 and of the cable 14 to the pin 12 which will be readily apparent to the skilled person.
  • the pin 12 is a clearance fit in the aperture 11 which has a smaller bore portion 11a corresponding to the shank of the pin 12 and a larger bore portion 11b corresponding to the head 16 and cable 14.
  • the annular gap between the head 16 and the adjacent surface of the body 10 constitutes a flame path 17 in which flame to one side of the boundary in which the assembly is mounted is stifled before it reaches the other side.
  • the flame path conforms to BS 5501.
  • a metal insert 18 is moulded into a radially projecting recess in the plastics body 10 adjacent the head portion 16 of the pin 12.
  • the insert 18 is in the form of an annular sheath or collar which lies flush with the larger bore portion of the aperture 11.
  • the insert is made of brass. However, it could equally well be made of any other suitable non-corrosive metal, such as stainless steel.
  • Figures 2A and 2B illustrate another form of elertical connector body according to the invention in which the body 10A is formed with apertures for four angularly spaced connector pins (not shown) which would protrude out of the body to the right-hand side as depicted in Figure 2B.
  • the body also has a central earth pin 20 and earth screen 22 extending radially between the apertures for the connector pins.
  • the flame path 17 is defined betwen the metal pin (not shown) and a metal insert 18A in a similar manner to that in Figure 1.
  • the plastics body has a further annular insert 18B extending around the circular section body 10A.
  • the insert 18B lies in a recess in the body 10A such that its radially outer surface is flush with the outer surface of the body 10A.
  • the body is receivable within either a protective metal housing by which it is securable to the bulkhead, or it is receivable directly in the metal bulkhead itself. In either case, the insert 18B defines a wear resistant flame path in conjunction with the adjacent surface of the housing or bulkhead.
  • the inserts 18A and 18B are a minimum of about 1 mm thick.
  • the insert 18A is about 16 mm internal diameter and the insert 18B is about 66 mm internal diameter.
  • the length of the flame path is 12.5 mm long and the maximum gap is 0.4 mm.
  • the combinations of path length and gap can, of course, vary. Preferably, they are kept within the limits specified in BS 5501.
  • the body and the element passing through it or the boundary both require erosion protection, in which case the flame path is completely defined by more than one insert mounted respectively on the body and the adjacent surface of the element or boundary.
  • the present invention can be used in other forms of assembly providing an interface at the boundary between an enclosure and an outside environment through which a communicating line, for example, an optical fibre or pipe, is required with the ability for it to be removed or shifted.
  • the assembly may constitute a connecting junction or a flame proof seal for the line etc., passing through the bulkhead.

Landscapes

  • Connector Housings Or Holding Contact Members (AREA)
EP90313414A 1989-12-11 1990-12-11 Assemblage d'interface pour cloison coupe-feu en milieu explosif Withdrawn EP0433003A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8927965A GB2240668B (en) 1989-12-11 1989-12-11 Interface assembly for bulkheads in explosive environments
GB8927965 1989-12-11

Publications (1)

Publication Number Publication Date
EP0433003A1 true EP0433003A1 (fr) 1991-06-19

Family

ID=10667761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90313414A Withdrawn EP0433003A1 (fr) 1989-12-11 1990-12-11 Assemblage d'interface pour cloison coupe-feu en milieu explosif

Country Status (2)

Country Link
EP (1) EP0433003A1 (fr)
GB (1) GB2240668B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3201993B1 (fr) * 2014-09-30 2021-07-07 Micro Motion, Inc. Traversée de borne

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE683422C (de) * 1938-06-01 1939-11-06 Schanzenbach & Co G M B H G Explosionssichere elektrische Steckdose
DE976251C (de) * 1952-09-09 1963-05-30 Adolf Schuch Kommanditgesellsc Gehaeuse zum Einbau elektrischer Apparate, vorzugsweise Schalter, in druckfester Bauart
GB2108331A (en) * 1981-10-05 1983-05-11 Bicc Plc Flameproof electric couplers
DE3221111A1 (de) * 1982-06-04 1983-12-08 Brown, Boveri & Cie Ag, 6800 Mannheim Explosions- oder schlagwettergeschuetzte kupplungssteckvorrichtung
EP0112258A2 (fr) * 1982-12-21 1984-06-27 Legrand Socle pour prise de courant de sécurité notamment pour atmosphère explosive

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1315686A (en) * 1970-11-17 1973-05-02 Heyes Co Ltd Flame-proof connector
GB1581266A (en) * 1978-05-31 1980-12-10 Mandoval Ltd Fireproofing of partition members
SE420784B (sv) * 1980-03-14 1981-10-26 Ericsson Telefon Ab L M Anordning for brandtetning av en genomforing for atminstone en ledning genom ett byggnadselement
GB2077382A (en) * 1980-06-04 1981-12-16 Stuart Anthony Rowland Fire-resistant sleeves
EP0177518B1 (fr) * 1984-04-03 1988-08-10 Werner Hauff Joint pour un passage pratique pour au moins une conduite a travers une ouverture murale
GB8417386D0 (en) * 1984-07-07 1984-08-08 Tarmac Construction Ltd Protector means for cable

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE683422C (de) * 1938-06-01 1939-11-06 Schanzenbach & Co G M B H G Explosionssichere elektrische Steckdose
DE976251C (de) * 1952-09-09 1963-05-30 Adolf Schuch Kommanditgesellsc Gehaeuse zum Einbau elektrischer Apparate, vorzugsweise Schalter, in druckfester Bauart
GB2108331A (en) * 1981-10-05 1983-05-11 Bicc Plc Flameproof electric couplers
DE3221111A1 (de) * 1982-06-04 1983-12-08 Brown, Boveri & Cie Ag, 6800 Mannheim Explosions- oder schlagwettergeschuetzte kupplungssteckvorrichtung
EP0112258A2 (fr) * 1982-12-21 1984-06-27 Legrand Socle pour prise de courant de sécurité notamment pour atmosphère explosive

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3201993B1 (fr) * 2014-09-30 2021-07-07 Micro Motion, Inc. Traversée de borne

Also Published As

Publication number Publication date
GB2240668A (en) 1991-08-07
GB2240668B (en) 1994-02-16
GB8927965D0 (en) 1990-02-14

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