EP0433003A1 - Abgeschottete Schnittstellenverbindung in explosionsgefährdeter Umgebung - Google Patents
Abgeschottete Schnittstellenverbindung in explosionsgefährdeter Umgebung Download PDFInfo
- 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- Withdrawn
Links
Images
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)
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 (de) | 1991-06-19 |
Family
ID=10667761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90313414A Withdrawn EP0433003A1 (de) | 1989-12-11 | 1990-12-11 | Abgeschottete Schnittstellenverbindung in explosionsgefährdeter Umgebung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0433003A1 (de) |
GB (1) | GB2240668B (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3201993B1 (de) * | 2014-09-30 | 2021-07-07 | Micro Motion, Inc. | Anschlussklemmendurchführung |
Citations (5)
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 (de) * | 1982-12-21 | 1984-06-27 | Legrand | Elektrische Sicherheitssteckdose insbesondere für explosive Atmosphäre |
Family Cites Families (6)
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 (de) * | 1984-04-03 | 1988-08-10 | Werner Hauff | Dichtkörper für eine durchführung für mindestens eine leitung durch eine wandöffnung |
GB8417386D0 (en) * | 1984-07-07 | 1984-08-08 | Tarmac Construction Ltd | Protector means for cable |
-
1989
- 1989-12-11 GB GB8927965A patent/GB2240668B/en not_active Expired - Fee Related
-
1990
- 1990-12-11 EP EP90313414A patent/EP0433003A1/de not_active Withdrawn
Patent Citations (5)
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 (de) * | 1982-12-21 | 1984-06-27 | Legrand | Elektrische Sicherheitssteckdose insbesondere für explosive Atmosphäre |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3201993B1 (de) * | 2014-09-30 | 2021-07-07 | Micro Motion, Inc. | Anschlussklemmendurchführung |
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19911216 |
|
17Q | First examination report despatched |
Effective date: 19930114 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19930517 |