EP1333539B1 - Electrical part for a solenoide valve - Google Patents

Electrical part for a solenoide valve Download PDF

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Publication number
EP1333539B1
EP1333539B1 EP20030001348 EP03001348A EP1333539B1 EP 1333539 B1 EP1333539 B1 EP 1333539B1 EP 20030001348 EP20030001348 EP 20030001348 EP 03001348 A EP03001348 A EP 03001348A EP 1333539 B1 EP1333539 B1 EP 1333539B1
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EP
European Patent Office
Prior art keywords
housing
connecting chamber
electric
cover
chamber
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
EP20030001348
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German (de)
French (fr)
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EP1333539A1 (en
Inventor
Christophe Favre
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
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Parker Hannifin Manufacturing Switzerland SA
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Publication date
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Publication of EP1333539A1 publication Critical patent/EP1333539A1/en
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Publication of EP1333539B1 publication Critical patent/EP1333539B1/en
Anticipated expiration legal-status Critical
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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
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/527—Flameproof cases

Definitions

  • the present invention relates to the explosion-proof electrical part of a solenoid valve comprising a housing enclosing a coil, on which there is an electrical connection chamber closed by a cover, the housing being intended to be coupled with the mechanical part of a solenoid valve, the coil constituting the electromagnetic actuator of the valve.
  • enclosures and electrical connection chambers are made of metal alloy, for example made of ferritic cast iron.
  • EN 50018 tolerates the internal explosions but imposes on the envelopes of these materials to be able to withstand these internal explosions that they could undergo due to gas locked in their housings. These explosions must be contained by the envelope, that is to say, be without impact on the explosive external environment.
  • the electrical connection chambers are made of metal, like the rest of the electrical part, the actual chamber having come in one piece with the housing, such a manufacturing requiring a recovery machining in addition to the injection .
  • the tolerances of the functional interlockings of the cover on the connection chamber providing a barrier against the propagation of flames due to the explosion towards the outside environment, which are defined by the standards, require machining operations which make the cost of manufacturing the electrical parts is high.
  • the object of the invention is to provide the electrical part of a solenoid valve overcoming these disadvantages.
  • the invention proposes to provide an explosion-proof electrical part meeting the specifications of the European standard EN 50018 for the use of electrical equipment in an explosive environment, whose housing and the electrical connection chamber are made of molded plastic, thereby reducing manufacturing costs.
  • housing means any means containing the coil, the metal conductors supplying the coil and, optionally, a thermal protection element.
  • the housing of the electrical part is either closed by a cover, or in the form of two half-shells, or monobloc.
  • the electrical part shown in figure 3 consists of a housing 1 closed by a cover 2.
  • This housing encloses an electromagnetic coil 11, electrical conductors 12 and a thermal protection element 13.
  • This housing is made of plastic material and the unoccupied volume 16 that it defines is filled with a resin, preferably a class H resin, during manufacturing.
  • On this housing is disposed an electrical connection chamber 3 closed by a plastic cover 30, held in position by means of a screw 8 in a nut 17 inserted in the housing 1.
  • This chamber contains the ends of the electrical conductors 12 supplying the coil 11, these conductors being connected to connection means of the AMP type or the like intended for the connection of supply cables 18 penetrating into the housing 1 through the orifice 14.
  • This chamber also contains a fuse 19 limiting the current electric.
  • the housing 1 has on its upper face a wall 4 accommodating in a groove 5 of the cover 30 and crushing a seal 6 located at the bottom of this groove 5.
  • the functional clearances allowing the housing 1 and the cover 30 to fit together in the other are defined by the norms regulating the use of electrical equipment in explosive environment, in particular the European norm EN 50018. This embedding and these functional games make it possible to prevent the propagation of the flames of an explosion in the chamber of electrical connection 3 to the potentially explosive environment.
  • the bottom of the cover 30 has protrusions, such as the protrusion 10 visible to the figure 3 , to reduce the unoccupied volume in the electrical connection chamber. Thus, we reduce the amount of gas trapped in the electrical connection chamber 3 and, therefore, the violence of a possible explosion in the electrical connection chamber. This risk being reduced, it is then possible, by complying with the European standard EN 50018 setting the maximum unoccupied volume in a plastic enclosure to 10 cm 3 , to make the connection chamber 3 and its cover 30 in such a material.
  • the projections are only or also on the bottom of the connection chamber. It is preferable that the projections are only on the cover so as not to hinder access to the connections. Thus, the unoccupied volume can be relatively large before closing and small with the lid.
  • the housing 1 can be closed, as shown on the figure 1 by a cover 2 after filling the volume 16 with a resin.
  • the housing 1 can be made by means of two half-shells together defining an unoccupied volume which is filled with a resin during manufacture.
  • the electrical connection chamber 3 is preferably made separately and inserted into the housing 1, either in an opening provided for this purpose in the housing or between two cuts if the housing 1 is made by means of two inserts and welded half-shells. .
  • the housing 1 can still be made by inserting the various components in a plastic material.
  • the coil 11, the electrical conductors 12 and the thermal protection element 13 are arranged in an injection mold, in which the connection chamber 3 has been previously deposited and positioned and then injecting the plastic material, a casing is obtained. presenting no unoccupied volume.
  • the insert constituting the connection chamber could have a groove into which a wall of the cover would fit, the volume of the connection chamber being entirely defined by the cover in the form of a cover, the insert being essentially flat.

Description

La présente invention concerne la partie électrique antidéflagrante d'une électrovanne comprenant un boîtier enfermant une bobine, sur lequel se trouve une chambre de raccordement électrique fermée par un couvercle, le boîtier étant destiné à être accouplé avec la partie mécanique d'une électrovanne, la bobine constituant l'actionneur électromagnétique de la vanne.The present invention relates to the explosion-proof electrical part of a solenoid valve comprising a housing enclosing a coil, on which there is an electrical connection chamber closed by a cover, the housing being intended to be coupled with the mechanical part of a solenoid valve, the coil constituting the electromagnetic actuator of the valve.

Du fait de certaines normes, en particulier la norme européenne EN 50018, définissant les caractéristiques que doivent respecter les matériels électriques en atmosphère explosible, les boîtiers et les chambres de raccordement électrique sont réalisées en alliage métallique, par exemple en fonte ferritique. En effet, la norme EN 50018 tolère les explosions internes mais impose aux enveloppes de ces matériels de pouvoir résister à ces explosions internes qu'elles pourraient subir du fait de gaz enfermés dans leurs boîtiers. Ces explosions doivent être contenues par l'enveloppe, c'est-à-dire être sans incidence sur le milieu extérieur explosible.Because of certain standards, in particular the European standard EN 50018, which defines the characteristics that electrical equipment must meet in potentially explosive atmospheres, enclosures and electrical connection chambers are made of metal alloy, for example made of ferritic cast iron. Indeed, the EN 50018 standard tolerates the internal explosions but imposes on the envelopes of these materials to be able to withstand these internal explosions that they could undergo due to gas locked in their housings. These explosions must be contained by the envelope, that is to say, be without impact on the explosive external environment.

On connaît des parties électriques, devant satisfaire à d'autres normes interdisant la possibilité d'une explosion interne, dont le boîtier est réalisé en matière plastique armée et rempli de résine lors de leur fabrication. En effet, en supprimant les volumes inoccupés où se trouvent emprisonnés des gaz, on rend impossible une explosion dans le boîtier. Cette solution n'est cependant pas transposable aux chambres de raccordement électrique. En effet, les câbles électriques connectés dans la chambre de raccordement électrique doivent pouvoir être débranchés et le fusible de protection doit pouvoir être changé. Il n'est par conséquent pas possible de remplir la chambre de raccordement électrique d'une résine lors de sa fabrication. Elle doit par conséquent être fermée par un couvercle amovible. Elle renferme par conséquent un volume inoccupé contenant des gaz. Pour cette raison, les chambres de raccordement électrique sont réalisées en métal, comme le reste de la partie électrique, la chambre proprement dite étant venue d'une pièce avec le boîtier, une telle fabrication nécessitant un usinage de reprise en plus de l'injection. En particulier, les tolérances des jeux fonctionnels d'encastrement du couvercle sur la chambre de raccordement assurant une barrière contre la propagation des flammes dues à l'explosion vers le milieu extérieur, qui sont définis par les normes, nécessitent des usinages qui font que le coût de fabrication des parties électriques est élevé.There are known electrical parts, having to meet other standards prohibiting the possibility of an internal explosion, whose housing is made of reinforced plastic material and filled with resin during their manufacture. Indeed, by removing the unoccupied volumes where gas is trapped, it makes impossible an explosion in the housing. This However, this solution can not be transposed to the electrical connection chambers. Indeed, the electrical cables connected in the electrical connection chamber must be disconnectable and the protective fuse must be able to be changed. It is therefore not possible to fill the electrical connection chamber with a resin during its manufacture. It must therefore be closed by a removable cover. It therefore contains an unoccupied volume containing gases. For this reason, the electrical connection chambers are made of metal, like the rest of the electrical part, the actual chamber having come in one piece with the housing, such a manufacturing requiring a recovery machining in addition to the injection . In particular, the tolerances of the functional interlockings of the cover on the connection chamber providing a barrier against the propagation of flames due to the explosion towards the outside environment, which are defined by the standards, require machining operations which make the cost of manufacturing the electrical parts is high.

Le but de l'invention est de réaliser la partie électrique d'une électrovanne palliant ces inconvénients. En particulier, l'invention se propose de réaliser une partie électrique antidéflagrante répondant aux spécifications de la norme européenne EN 50018 pour l'utilisation des matériels électriques en milieu explosible, dont le boîtier et la chambre de raccordement électrique sont réalisés en matière plastique moulée, permettant ainsi une réduction des coûts de fabrication.The object of the invention is to provide the electrical part of a solenoid valve overcoming these disadvantages. In particular, the invention proposes to provide an explosion-proof electrical part meeting the specifications of the European standard EN 50018 for the use of electrical equipment in an explosive environment, whose housing and the electrical connection chamber are made of molded plastic, thereby reducing manufacturing costs.

Par boîtier, on entend tout moyen contenant la bobine, les conducteurs métalliques alimentant la bobine et, éventuellement, un élément de protection thermique.By housing means any means containing the coil, the metal conductors supplying the coil and, optionally, a thermal protection element.

La partie électrique selon l'invention est caractérisée par la clause caractérisante de la revendication 1The electrical part according to the invention is characterized by the characterizing clause of claim 1

Selon les modes de réalisation de l'invention, le boîtier de la partie électrique est soit fermé par un couvercle, soit réalisé sous la forme de deux demi-coquilles, soit monobloc.According to the embodiments of the invention, the housing of the electrical part is either closed by a cover, or in the form of two half-shells, or monobloc.

Le dessin annexé représente, à titre d'exemple, un mode de réalisation de l'invention.

  • La figure 1 est une vue en plan d'une partie électrique selon l'invention.
  • La figure 2 en représente une vue partiellement éclatée.
  • La figure 3 est une vue en coupe longitudinale selon le plan III-III de la figure 1.
The appended drawing represents, by way of example, an embodiment of the invention.
  • The figure 1 is a plan view of an electrical part according to the invention.
  • The figure 2 represents a partially exploded view.
  • The figure 3 is a longitudinal sectional view along plane III-III of the figure 1 .

La partie électrique représentée à la figure 3 est composée d'un boîtier 1 fermé par un couvercle 2. Ce boîtier renferme une bobine électromagnétique 11, des conducteurs électriques 12 et un élément de protection thermique 13. Ce boîtier est réalisé en matière plastique et le volume inoccupé 16 qu'il définit est rempli d'une résine, de préférence une résine de classe H, lors de la fabrication. Sur ce boîtier est disposée une chambre de raccordement électrique 3 fermée par un couvercle 30 en matière plastique, maintenu en position au moyen d'une vis 8 visée dans un écrou 17 inséré dans le boîtier 1. Cette chambre renferme les extrémités des conducteurs électriques 12 alimentant la bobine 11, ces conducteurs étant reliés à des moyens de connexion de type AMP ou similaires destinés à la connexion de câbles d'alimentation 18 pénétrant dans le boîtier 1 par l'orifice 14. Cette chambre renferme aussi un fusible 19 limitant le courant électrique. Le boîtier 1 présente sur sa face supérieure une paroi 4 se logeant dans une rainure 5 du couvercle 30 et écrasant un joint 6 situé au fond de cette rainure 5. Les jeux fonctionnels permettant au boîtier 1 et au couvercle 30 de s'encastrer l'un dans l'autre sont définis par les normes réglementant l'utilisation des matériels électriques en milieu explosible, notamment la norme européenne EN 50018. Cet encastrement et ces jeux fonctionnels permettent d'empêcher la propagation des flammes d'une explosion dans la chambre de raccordement électrique 3 au milieu extérieur explosible. Le fond du couvercle 30 présente des saillies, telles que la saillie 10 visible à la figure 3, permettant de réduire le volume inoccupé dans la chambre de raccordement électrique. Ainsi, on diminue la quantité de gaz emprisonnés dans la chambre de raccordement électrique 3 et, par conséquent, la violence d'une éventuelle explosion dans la chambre de raccordement électrique. Ce risque étant réduit, il est alors possible, en respectant la norme européenne EN 50018 fixant à 10 cm3 le volume maximal inoccupé dans une enceinte en matière plastique, de réaliser la chambre de raccordement 3 et son couvercle 30 en une telle matière.The electrical part shown in figure 3 consists of a housing 1 closed by a cover 2. This housing encloses an electromagnetic coil 11, electrical conductors 12 and a thermal protection element 13. This housing is made of plastic material and the unoccupied volume 16 that it defines is filled with a resin, preferably a class H resin, during manufacturing. On this housing is disposed an electrical connection chamber 3 closed by a plastic cover 30, held in position by means of a screw 8 in a nut 17 inserted in the housing 1. This chamber contains the ends of the electrical conductors 12 supplying the coil 11, these conductors being connected to connection means of the AMP type or the like intended for the connection of supply cables 18 penetrating into the housing 1 through the orifice 14. This chamber also contains a fuse 19 limiting the current electric. The housing 1 has on its upper face a wall 4 accommodating in a groove 5 of the cover 30 and crushing a seal 6 located at the bottom of this groove 5. The functional clearances allowing the housing 1 and the cover 30 to fit together in the other are defined by the norms regulating the use of electrical equipment in explosive environment, in particular the European norm EN 50018. This embedding and these functional games make it possible to prevent the propagation of the flames of an explosion in the chamber of electrical connection 3 to the potentially explosive environment. The bottom of the cover 30 has protrusions, such as the protrusion 10 visible to the figure 3 , to reduce the unoccupied volume in the electrical connection chamber. Thus, we reduce the amount of gas trapped in the electrical connection chamber 3 and, therefore, the violence of a possible explosion in the electrical connection chamber. This risk being reduced, it is then possible, by complying with the European standard EN 50018 setting the maximum unoccupied volume in a plastic enclosure to 10 cm 3 , to make the connection chamber 3 and its cover 30 in such a material.

Il est bien entendu possible que les saillies se trouvent uniquement ou aussi sur le fond de la chambre de raccordement. Il est préférable que les saillies soient uniquement sur le couvercle afin de ne pas gêner l'accès aux connexions. Ainsi, le volume inoccupé peut être relativement grand avant fermeture et petit avec le couvercle.It is of course possible that the projections are only or also on the bottom of the connection chamber. It is preferable that the projections are only on the cover so as not to hinder access to the connections. Thus, the unoccupied volume can be relatively large before closing and small with the lid.

Le boîtier 1 peut être fermé, comme représenté sur la figure 1, par un couvercle 2 après remplissage du volume 16 par une résine.The housing 1 can be closed, as shown on the figure 1 by a cover 2 after filling the volume 16 with a resin.

Le boîtier 1 peut être réalisé au moyen de deux demi-coquilles réunies définissant un volume inoccupé qui est rempli par une résine lors de la fabrication. La chambre de raccordement électrique 3 est de préférence, réalisée séparément et insérée dans le boîtier 1, soit dans une ouverture prévue à cet effet dans le boîtier soit entre deux découpes si le boîtier 1 est réalisé au moyen de deux demi-coquilles rapportées et soudées.The housing 1 can be made by means of two half-shells together defining an unoccupied volume which is filled with a resin during manufacture. The electrical connection chamber 3 is preferably made separately and inserted into the housing 1, either in an opening provided for this purpose in the housing or between two cuts if the housing 1 is made by means of two inserts and welded half-shells. .

Le boîtier 1 peut encore être réalisé par insertion des différents composants dans une matière plastique. En disposant la bobine 11, les conducteurs électriques 12 et l'élément de protection thermique 13 dans un moule d'injection, dans lequel la chambre de raccordement 3 a été préalablement déposée et positionnée puis en injectant la matière plastique, on obtient un boîtier ne présentant pas de volume inoccupé.The housing 1 can still be made by inserting the various components in a plastic material. By arranging the coil 11, the electrical conductors 12 and the thermal protection element 13 in an injection mold, in which the connection chamber 3 has been previously deposited and positioned and then injecting the plastic material, a casing is obtained. presenting no unoccupied volume.

Au lieu de la paroi 4, l'insert constituant la chambre de raccordement pourrait présenter une rainure dans laquelle viendrait s'emboîter une paroi du couvercle, le volume de la chambre de raccordement étant entièrement défini par le couvercle en forme de capot, l'insert étant essentiellement plat.Instead of the wall 4, the insert constituting the connection chamber could have a groove into which a wall of the cover would fit, the volume of the connection chamber being entirely defined by the cover in the form of a cover, the insert being essentially flat.

Claims (7)

  1. Explosion proof electric portion of a solenoid valve, including a housing (1), mainly enclosing a solenoid (11) and on which is located an electric connecting chamber(3) closed by a first cover (30), characterised in that the housing (1), the connecting chamber (3) and the first cover are made of a plastics material, and that the first cover (30) and/or the bottom of the connecting chamber have protrusions (10) for diminishing the unoccupied volume of the electric connecting chamber.
  2. Electric portion according to claim 1, characterised in that the commixing chamber (3) is composed of a piece attached to the housing.
  3. Electric portion according to claim 1 or 2, characterised in that the cabinet (1) is closed by a second cover (2)
  4. Electric portion according to claim 1 or 2, characterised in that the housing (1) is made of two half shells.
  5. Electric portion according to claim 1 or 2, characterised in that the cabinet (1) is a monoblock.
  6. Process for the manufacturing of an explosion proof electric portion of a solenoid valve according to claim 2, characterised in that a housing (1), a piece for forming, together with a first cover, an electric chamber connecting chamber (3), and the first cover are manufactured separately, the housing, the connecting chamber (3) and the first cover (30) and/or the the bottom of the connecting chamber being provided with with protrusions (10) destined for diminishing the unoccupied volume of the electric connecting chamber, at least the solenoid (11) and its electric connectors (12) are disposed in the housing, and then the housing (1) and said piece of the connecting chamber are assembles in such a manner that the electric connecting chamber is located on the housing, the cabinet being finally filled with a filler material.
  7. Method of manufacturing of an explosion proof portion of a solenoid valve according to claim 5, characterised in that at least the solenoid (11), the electric conductors (12) and the connecting chamber (3) are disposed and positioned within an injection mould, and a plastics material is then injected, obtaining in this way a housing free from any unoccupied volume, and on which the electric connecting chamber is located, the electric connecting chamber being closed by a first cover , the connecting chamber and the first cover being made of plastics material and the first cover (30) and/or the bottom of the connecting chamber being provided with protrusions destined for diminishing the unoccupied volume of the electric connecting chamber.
EP20030001348 2002-02-05 2003-01-24 Electrical part for a solenoide valve Expired - Lifetime EP1333539B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1902002 2002-02-05
CH1902002 2002-02-05

Publications (2)

Publication Number Publication Date
EP1333539A1 EP1333539A1 (en) 2003-08-06
EP1333539B1 true EP1333539B1 (en) 2012-06-20

Family

ID=4436808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030001348 Expired - Lifetime EP1333539B1 (en) 2002-02-05 2003-01-24 Electrical part for a solenoide valve

Country Status (2)

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EP (1) EP1333539B1 (en)
DK (1) DK1333539T3 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK53383A (en) * 1983-02-08 1984-08-09 Granzow Aps P CONDENSATOR DISCHARGE VALVE
GB8512134D0 (en) * 1985-05-14 1985-06-19 Bicc Plc Electric coupler
DE4118834B4 (en) * 1991-06-07 2005-05-12 Continental Teves Ag & Co. Ohg hydraulic power unit
JP3250488B2 (en) * 1996-09-26 2002-01-28 住友電気工業株式会社 Hydraulic pressure control device

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EP1333539A1 (en) 2003-08-06
DK1333539T3 (en) 2012-09-17

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