EP0905820A1 - Electrical installation for use in an environment presenting a risk of explosion - Google Patents

Electrical installation for use in an environment presenting a risk of explosion Download PDF

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Publication number
EP0905820A1
EP0905820A1 EP98810789A EP98810789A EP0905820A1 EP 0905820 A1 EP0905820 A1 EP 0905820A1 EP 98810789 A EP98810789 A EP 98810789A EP 98810789 A EP98810789 A EP 98810789A EP 0905820 A1 EP0905820 A1 EP 0905820A1
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EP
European Patent Office
Prior art keywords
housing
connection
installation
inert
pluggable
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.)
Granted
Application number
EP98810789A
Other languages
German (de)
French (fr)
Other versions
EP0905820B1 (en
Inventor
Raphael Prina
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.)
Parker Hannifin Manufacturing Switzerland SA
Original Assignee
Parker Lucifer SA
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Filing date
Publication date
Application filed by Parker Lucifer SA filed Critical Parker Lucifer SA
Publication of EP0905820A1 publication Critical patent/EP0905820A1/en
Application granted granted Critical
Publication of EP0905820B1 publication Critical patent/EP0905820B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01R13/53—Bases or cases for heavy duty; Bases or cases for high voltage with means for preventing corona or arcing

Definitions

  • the present invention relates to an installation electric designed to work in an environment presenting a risk of explosion caused by an arc electric, comprising at least one electric element or plug-in inert electronics for its connection galvanic to the rest of the installation, this element inert with a cylindrical or prismatic body and being provided with plug-in connection members in connection members of the installation.
  • the present invention aims to allow the replacement of an inert plug-in component, such as than a coil or sensor, without the need to interrupt the power supply to the installation.
  • the electrical installation according to the invention is characterized in that with the exception of the pluggable inert element it is contained in a case filled with an inert gas maintained at a pressure higher than the surrounding atmospheric pressure, that the live connection devices are located at the bottom of a cylindrical housing, respectively prismatic communicating with the inside of the case and in which the body of the inert element is engaged pluggable, the section of said housing corresponding to the body section of the plug-in inert element with a clearance corresponding to the IP 40 standard and in that the depth of this housing is greater than the length of the mutual commitment of the connection bodies increased by the maximum length of the electric arc forming between these organs during their separation.
  • Said housing is formed, for example, in a block insulation fitted with a gasket ensuring waterproof communication between the interior of the installation and said housing.
  • the insulating block carries the connection members remaining energized.
  • the accommodation communicating with the interior of the installation is filled with pressurized inert gas which flows through the IP 40 clearance between the housing wall and the body of the plug-in element. This body never leaves the housing only after disappearance of the electric arc which is formed between the connecting members.
  • the drawing shows the end of a case 1 in material insulator constituting, in the particular case, one of the components of a solenoid valve battery, this element being provided with transverse passages connected to the passages of a neighboring component in a sealed manner, the sealing being provided by seals such that the trim 2.
  • the housing 1 has an opening in which is fitted a block 3 of insulating material fitted with a seal 4 ensuring the sealing of the front joint plane between block 3 and the housing 1.
  • the part of the block 3 penetrating at the interior of the housing 1 carries connection members 5, in the particular case of clamp contacts, held by a contact carrier 6 fixed to block 3 by a screw 7.
  • the connection members 5 are connected to the components contained in the housing 1.
  • Block 3 has passages 8 and 9 for the terminals 10 and 11 of an inert plug-in component 12, for example example a solenoid valve coil, having a shape cylindrical exterior on at least part of its height of the side of the terminals 10 and 11.
  • the body 3 presents, in the extension of passages 8 and 9, a cylindrical housing 13 of section substantially equal to the section of the body of the plug-in element 12, so that the clearance e between the cylindrical wall of the housing 13 and the plug-in element 12 corresponds to the IP 40 standard, that is to say is less than 1 mm.
  • plug-in element 12 does not come out of housing 13 before the disappearance of the electric arc between the connecting members. Conversely, the element plug-in 12 is engaged in the housing 13 before that an electric arc can produce.
  • the body 3 is preferably made of molded plastic, by example of PA 6.6 loaded with 30% fiberglass.
  • the live electronics are inside the case 1 and, for example, a bus, a microprocessor, etc.
  • the housing 1 In the housing 1 is continuously introduced air under pressure so that the pressure at the interior of the housing 1 is constantly greater than surrounding pressure.

Abstract

The free play zone (d2) following plug extraction allows the maximum arc to form within the unit area following the recommended standards in this area.

Description

La présente invention concerne une installation électrique destinée à travailler dans un environnement présentant un risque d'explosion provoqué par un arc électrique, comprenant au moins un élément électrique ou électronique inerte enfichable pour sa liaison galvanique au reste de l'installation, cet élément inerte présentant un corps cylindrique ou prismatique et étant muni d'organes de connexion enfichables dans des organes de connexion de l'installation.The present invention relates to an installation electric designed to work in an environment presenting a risk of explosion caused by an arc electric, comprising at least one electric element or plug-in inert electronics for its connection galvanic to the rest of the installation, this element inert with a cylindrical or prismatic body and being provided with plug-in connection members in connection members of the installation.

Dans l'industrie chimique, on utilise des installations électriques comportant essentiellement des électrovannes pour la commande de circuit de fluide et des capteurs pour la saisie de différents paramètres. Dans les installations modernes, les bobines des électrovannes sont enfichables de manière à pouvoir être changées rapidement en cas de claquage. Il en est de même des capteurs. Ces installations travaillent souvent dans un environnement présentant des risques élevés d'explosions provoquables par un arc électrique, aussi faible soit-il. De manière à isoler l'installation électrique de l'environnement gazeux explosif, l'installation est confinée dans une armoire remplie d'un gaz inerte, par exemple de l'air, maintenu à une pression supérieure à la pression atmosphérique de l'environnement. Lorsqu'il faut remplacer une bobine ou un capteur, il est nécessaire d'ouvrir l'armoire et de couper l'alimentation électrique de l'installation, ce qui a lieu généralement automatiquement par l'ouverture de l'armoire, pour pouvoir enlever l'élément à remplacer et en mettre un nouveau sans qu'il se forme d'arc électrique entre les organes de connexion, l'isolation de l'installation par rapport à l'environnement n'étant plus assurée. L'interruption de l'alimentation électrique signifie toutefois l'arrêt du processus chimique en cours. Or, un tel arrêt peut représenter, en termes de production, une perte de plusieurs dizaines de milliers de francs par minute.In the chemical industry, facilities are used electrical essentially comprising solenoid valves for fluid circuit control and sensors for entering different parameters. In modern installations, the coils of solenoid valves are pluggable so that be changed quickly in the event of a breakdown. It is likewise sensors. These facilities work often in a hazardous environment high explosions caused by an electric arc, as weak as it is. So as to isolate the electrical installation of the gaseous environment explosive, the installation is confined in a cabinet filled with an inert gas, for example air, maintained at a pressure higher than atmospheric pressure of the environment. When to replace a coil or a sensor, it is necessary to open the cabinet and cut the electrical supply to the installation, which usually takes place automatically by the opening of the cabinet, to be able to remove the element to replace and put a new one without that an electric arc is formed between the organs of connection, isolation of the installation from the environment is no longer assured. The interruption of however, the power supply means that the chemical process in progress. However, such a judgment may represent, in terms of production, a loss of several tens of thousands of francs per minute.

La présente invention a pour but de permettre le remplacement d'un composant inerte enfichable, telle qu'une bobine ou un capteur, sans qu'il soit nécessaire d'interrompre l'alimentation électrique de l'installation.The present invention aims to allow the replacement of an inert plug-in component, such as than a coil or sensor, without the need to interrupt the power supply to the installation.

A cet effet, l'installation électrique selon l'invention est caractérisée en ce qu'à l'exception de l'élément inerte enfichable, elle est contenue dans un boítier rempli d'un gaz inerte maintenu à une pression supérieure à la pression atmosphérique environnante, que les organes de connexion sous tension sont situés au fond d'un logement cylindrique, respectivement prismatique communiquant avec l'intérieur du boítier et dans lequel est engagé le corps de l'élément inerte enfichable, la section dudit logement correspondant à la section du corps de l'élément inerte enfichable avec un jeu correspondant à la norme IP 40 et en ce que la profondeur de ce logement est supérieure à la longueur de l'engagement mutuel des organes de connexion augmentée de la longueur maximale de l'arc électrique se formant entre ces organes lors de leur séparation.To this end, the electrical installation according to the invention is characterized in that with the exception of the pluggable inert element it is contained in a case filled with an inert gas maintained at a pressure higher than the surrounding atmospheric pressure, that the live connection devices are located at the bottom of a cylindrical housing, respectively prismatic communicating with the inside of the case and in which the body of the inert element is engaged pluggable, the section of said housing corresponding to the body section of the plug-in inert element with a clearance corresponding to the IP 40 standard and in that the depth of this housing is greater than the length of the mutual commitment of the connection bodies increased by the maximum length of the electric arc forming between these organs during their separation.

Ledit logement est formé, par exemple, dans un bloc isolant muni d'une garniture d'étanchéité assurant une communication étanche entre l'intérieur de l'installation et ledit logement.Said housing is formed, for example, in a block insulation fitted with a gasket ensuring waterproof communication between the interior of the installation and said housing.

Dans une réalisation pratique, le bloc isolant porte les organes de connexion restant sous tension.In a practical embodiment, the insulating block carries the connection members remaining energized.

Le logement communiquant avec l'intérieur de l'installation est rempli de gaz inerte pressurisé qui s'écoule par le jeu IP 40 entre la paroi du logement et le corps de l'élément enfichable. Ce corps ne quitte le logement qu'après disparition de l'arc électrique qui se forme entre les organes de connexion.The accommodation communicating with the interior of the installation is filled with pressurized inert gas which flows through the IP 40 clearance between the housing wall and the body of the plug-in element. This body never leaves the housing only after disappearance of the electric arc which is formed between the connecting members.

Le dessin annexé illustre, par un exemple, le principe de la connexion selon l'invention.The accompanying drawing illustrates, by way of example, the principle of the connection according to the invention.

L'unique figure du dessin est une vue partielle et en coupe axiale à travers les moyens de connexion reliant une partie de l'installation à un élément inerte enfichable.The only figure in the drawing is a partial view in axial section through the connecting means connecting part of the installation to an inert element pluggable.

Le dessin montre l'extrémité d'un boítier 1 en matière isolante constituant, dans le cas particulier, l'un des composants d'une batterie d'électrovalves, cet élément étant muni de passages transversaux reliés aux passages d'un composant voisin de manière étanche, l'étanchéité étant assurée par des garnitures d'étanchéité telles que la garniture 2. Le boítier 1 présente une ouverture dans laquelle est emboíté un bloc 3 en matière isolante muni d'une garniture d'étanchéité 4 assurant l'étanchéité du plan de joint frontal entre le bloc 3 et le boítier 1. La partie du bloc 3 pénétrant à l'intérieur du boítier 1 porte des organes de connexion 5, dans le cas particulier des contacts à pinces, maintenus par un porte-contacts 6 fixé au bloc 3 par une vis 7. Les organes de connexion 5 sont reliés aux composants contenus dans le boítier 1.The drawing shows the end of a case 1 in material insulator constituting, in the particular case, one of the components of a solenoid valve battery, this element being provided with transverse passages connected to the passages of a neighboring component in a sealed manner, the sealing being provided by seals such that the trim 2. The housing 1 has an opening in which is fitted a block 3 of insulating material fitted with a seal 4 ensuring the sealing of the front joint plane between block 3 and the housing 1. The part of the block 3 penetrating at the interior of the housing 1 carries connection members 5, in the particular case of clamp contacts, held by a contact carrier 6 fixed to block 3 by a screw 7. The connection members 5 are connected to the components contained in the housing 1.

Le bloc 3 présente des passages 8 et 9 pour les cosses 10 et 11 d'un composant inerte enfichable 12, par exemple une bobine d'électrovalve, présentant une forme extérieure cylindrique sur au moins une partie de sa hauteur du côté des cosses 10 et 11. Le corps 3 présente, dans le prolongement des passages 8 et 9, un logement cylindrique 13 de section sensiblement égale à la section du corps de l'élément enfichable 12, de telle sorte que le jeu e entre la paroi cylindrique du logement 13 et l'élément enfichable 12 correspond à la norme IP 40, c'est-à-dire est inférieur à 1 mm.Block 3 has passages 8 and 9 for the terminals 10 and 11 of an inert plug-in component 12, for example example a solenoid valve coil, having a shape cylindrical exterior on at least part of its height of the side of the terminals 10 and 11. The body 3 presents, in the extension of passages 8 and 9, a cylindrical housing 13 of section substantially equal to the section of the body of the plug-in element 12, so that the clearance e between the cylindrical wall of the housing 13 and the plug-in element 12 corresponds to the IP 40 standard, that is to say is less than 1 mm.

Dans le dessin

a =
longueur maximale de l'arc électrique entre les organes de connexion
d1 =
pénétration des cosses 10 et 11 dans les contacts 5
d2=
profondeur du logement 13 ou profondeur d'engagement de l'élément 12 dans le corps
b=
longueur résiduelle de cet engagement après cessation de l'arc électrique.
In the drawing
a =
maximum length of the electric arc between the connecting members
d1 =
penetration of lugs 10 and 11 into contacts 5
d2 =
depth of the housing 13 or depth of engagement of the element 12 in the body
b =
residual length of this engagement after cessation of the electric arc.

Les grandeurs ci-dessus satisfont les conditions suivantes : d2 (d1 + a) d2 = (d1 + a) + b. The above quantities satisfy the following conditions: d2 (d1 + a) d2 = (d1 + a) + b.

Cela signifie que l'élément enfichable 12 ne sort pas du logement 13 avant la disparition de l'arc électrique entre les organes de connexion. Inversement, l'élément enfichable 12 est engagé dans le logement 13 avant qu'un arc électrique puisse de produire.This means that the plug-in element 12 does not come out of housing 13 before the disappearance of the electric arc between the connecting members. Conversely, the element plug-in 12 is engaged in the housing 13 before that an electric arc can produce.

Le corps 3 est de préférence en plastique moulé, par exemple du PA 6.6 chargé de 30 % de fibre de verre.The body 3 is preferably made of molded plastic, by example of PA 6.6 loaded with 30% fiberglass.

L'électronique sous tension se trouve à l'intérieur du boítier 1 et, par exemple, un bus, un microprocesseur, etc.The live electronics are inside the case 1 and, for example, a bus, a microprocessor, etc.

Dans le boítier 1 est introduit en continu de l'air sous pression de telle sorte que la pression à l'intérieur du boítier 1 est constamment supérieure à la pression environnante. In the housing 1 is continuously introduced air under pressure so that the pressure at the interior of the housing 1 is constantly greater than surrounding pressure.

L'espace 13 communiquant avec l'intérieur du boítier 1, il contient également de l'air pressurisé isolant les organes de connexion de l'extérieur. L'air s'échappe lentement par le jeu entre le logement et l'élément enfichable.The space 13 communicating with the interior of the housing 1, it also contains pressurized air insulating the connection devices from the outside. Air escapes slowly by the play between the housing and the element pluggable.

Après l'enlèvement de l'élément enfichable 12, l'air sous pression contenu dans l'installation s'échappe par les passages 8 et 9 dont la section est suffisamment faible pour créer une perte de charge importante. Cette perte de charge pourrait être augmentée par un étranglement.After removal of the plug-in element 12, the air under pressure contained in the installation escapes by passages 8 and 9, the cross section of which is sufficient low to create a significant pressure drop. This pressure drop could be increased by a strangulation.

Claims (3)

Installation électrique destinée à travailler dans un environnement présentant un risque d'explosion provoqué par un arc électrique, comprenant au moins un élément électrique ou électronique inerte (12) enfichable pour sa liaison galvanique au reste de l'installation, cet élément inerte présentant un corps cylindrique ou prismatique et étant muni d'organes de connexion (10, 11) enfichables dans des organes de connexion (5) de l'installation, caractérisée en ce qu'à l'exception de l'élément inerte enfichable, elle est contenue dans un boítier (1) rempli d'un gaz inerte maintenu à une pression supérieure à la pression atmosphérique environnante, que les organes de connexion sous tension (5) sont situés au fond d'un logement cylindrique (13), respectivement prismatique communiquant avec l'intérieur du boítier (1) et dans lequel est engagé le corps de l'élément inerte enfichable (12), la section dudit logement correspondant à la section du corps de l'élément inerte enfichable avec un jeu (e) correspondant à la norme IP 40 et en ce que la profondeur (d2) du logement est supérieure à la longueur (d1) de l'engagement mutuel des organes de connexion augmentée de la longueur maximale de l'arc électrique (a) se formant entre ces organes lors de leur séparation.Electrical installation intended to work in an environment presenting a risk of explosion caused by an electric arc, comprising at least one inert electrical or electronic element (12) pluggable for its galvanic connection to the rest of the installation, this inert element presenting a body cylindrical or prismatic and being provided with connection (10, 11) pluggable into installation connection (5), characterized in that with the exception of the plug-in inert element, it is contained in a housing (1) filled with an inert gas maintained at a pressure higher than the pressure surrounding atmosphere, that the organs of live connection (5) are located at the bottom of a cylindrical housing (13), respectively prismatic communicating with the interior of the housing (1) and in which is engaged the body of the inert element pluggable (12), the section of said housing corresponding to the body section of the inert element pluggable with a set corresponding to the IP standard 40 and in that the depth (d2) of the housing is greater than the length (d1) of the mutual commitment connecting members increased in length maximum of the electric arc (a) forming between these organs during their separation. Installation selon la revendication 1, caractérisée en ce que ledit logement (13) est formé dans un bloc isolant (3) muni d'une garniture d'étanchéité (4) assurant une liaison étanche entre le bloc et le boítier (1).Installation according to claim 1, characterized in that said housing (13) is formed in a block insulator (3) provided with a seal (4) ensuring a tight connection between the block and the housing (1). Installation selon la revendication 2, caractérisée en ce que ledit bloc isolant (3) porte les organes de connexion sous tension (5).Installation according to claim 2, characterized in that said insulating block (3) carries the organs of live connection (5).
EP19980810789 1997-09-25 1998-08-18 Electrical installation for use in an environment presenting a risk of explosion Expired - Lifetime EP0905820B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH02265/97A CH691645A5 (en) 1997-09-25 1997-09-25 electrical installation for work in environments with a risk of explosion.
CH2265/97 1997-09-25

Publications (2)

Publication Number Publication Date
EP0905820A1 true EP0905820A1 (en) 1999-03-31
EP0905820B1 EP0905820B1 (en) 2006-03-22

Family

ID=4229732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980810789 Expired - Lifetime EP0905820B1 (en) 1997-09-25 1998-08-18 Electrical installation for use in an environment presenting a risk of explosion

Country Status (4)

Country Link
EP (1) EP0905820B1 (en)
CH (1) CH691645A5 (en)
DE (1) DE69833931T2 (en)
DK (1) DK0905820T3 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659250A (en) * 1970-10-14 1972-04-25 Robert F Horton Electrical connector
US4166664A (en) * 1975-01-24 1979-09-04 Amp Incorporated High voltage quick disconnect electrical connector assembly
US4192572A (en) * 1973-10-15 1980-03-11 Amerace Corporation Electrical connector apparatus
GB2152302A (en) * 1983-12-20 1985-07-31 Biw Cables Inc Explosion proof electrical connector system with quick power disconnect

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659250A (en) * 1970-10-14 1972-04-25 Robert F Horton Electrical connector
US4192572A (en) * 1973-10-15 1980-03-11 Amerace Corporation Electrical connector apparatus
US4166664A (en) * 1975-01-24 1979-09-04 Amp Incorporated High voltage quick disconnect electrical connector assembly
GB2152302A (en) * 1983-12-20 1985-07-31 Biw Cables Inc Explosion proof electrical connector system with quick power disconnect

Also Published As

Publication number Publication date
CH691645A5 (en) 2001-08-31
DE69833931T2 (en) 2006-12-14
DE69833931D1 (en) 2006-05-11
EP0905820B1 (en) 2006-03-22
DK0905820T3 (en) 2006-07-31

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