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EP0066261B1 - Method of making an organic insulator - Google Patents

Method of making an organic insulator Download PDF

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Publication number
EP0066261B1
EP0066261B1 EP82104641A EP82104641A EP0066261B1 EP 0066261 B1 EP0066261 B1 EP 0066261B1 EP 82104641 A EP82104641 A EP 82104641A EP 82104641 A EP82104641 A EP 82104641A EP 0066261 B1 EP0066261 B1 EP 0066261B1
Authority
EP
European Patent Office
Prior art keywords
rod
end fittings
manufacturing
fittings
fitting
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
Application number
EP82104641A
Other languages
German (de)
French (fr)
Other versions
EP0066261A1 (en
Inventor
Alexandre Kaczerginski
Laurent Pargamin
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.)
Ceraver SA
Original Assignee
Ceraver SA
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9259044&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0066261(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ceraver SA filed Critical Ceraver SA
Priority to AT82104641T priority Critical patent/ATE15957T1/en
Publication of EP0066261A1 publication Critical patent/EP0066261A1/en
Application granted granted Critical
Publication of EP0066261B1 publication Critical patent/EP0066261B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/32—Single insulators consisting of two or more dissimilar insulating bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/54—Processes in making insulators

Definitions

  • the present invention relates to a method for manufacturing an organic insulator according to the preamble of claim 1.
  • the rod is first coated with an insulating sheet, and the ends are provided with reinforcements, before that we perform overmolding.
  • Two rings forming part of the mold ensure the spacing of the reinforcements for the future coating and a separation between the molding mass and the reinforcements.
  • the ends of the rod are inflated by injecting a curable resin into each frame.
  • the temperature of the molding device is of the order of a few hundred degrees Celsius depending on the insulation used, for example 200 ° C; the parts of the steel molds, the reinforcements generally of aluminum or the like, and the rod in glass fibers, expand in a different way, and this results in stresses on the rod and on the reinforcements which may be the cause of subsequent degradation of the quality of the anchoring of the reinforcements.
  • the object of the present invention is to implement a method making it possible to avoid these drawbacks.
  • Such a method is economical because it implements a simple molding device, and does not involve any delicate operation of positioning in the mold of the rod and its reinforcements; in addition, it avoids the appearance in the insulator of the mechanical stresses mentioned above and it provides good resistance to humidity.
  • the previous operation can be carried out at a moderate temperature, for example of the order of 100 ° C, allowing easy handling of the various elements.
  • the seal 5 is firmly applied against the shoulder 4 and seals the cavity 3.
  • the frame 2 has two holes communicating the cavity 3 with the outside.
  • the orifice 20 is used for the introduction of a sealing material, while the orifice 21 is used for the evacuation of the air. After filling the cavity 3, it is screwed or force-fitted into the orifices of the closure caps not shown. Note that it is also possible to carry out the filling operation when the armature has a single orifice.
  • a sealing material of the compound, charged epoxy, polymerizable under such temperature conditions could be used.
  • any other equivalent sealing method can be considered.
  • connection between the rod 1 and its frame 30 can be achieved by shrinking after leaving the mold.
  • the frame has been referenced 30 before the necking shown diagrammatically by the arrow 100, and 30 ′ this same frame after necking.
  • the seal 35 is strongly compressed in 35 '.
  • Such a method includes a phase of pre-shrinking the collar of the reinforcement on the seal 5 to further improve the seal before molding the coating 13; it ends with a sealing of the rod in the reinforcement using a sealing material.

Landscapes

  • Insulating Bodies (AREA)
  • Insulators (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The ends of a fiber-reinforced resin rod are inserted through sealing grommets into cavities of respective end fittings; the end fittings of the assembly are placed in accurately spaced end moulds; the rod is encased in intermediate half shells; an insulator covering is moulded around the rod by filling the half shells; and the end fittings are then fixed to the rod by embedding or swaging.

Description

La présente invention concerne un procédé de fabrication d'un isolateur organique selon le préambule de la revendication 1.The present invention relates to a method for manufacturing an organic insulator according to the preamble of claim 1.

Un procédé répondant à cette définition est connu, voir par exemple le document brevet FR-A-1 603 508. Selon ce document, le jonc est d'abord revêtu d'une feuille isolante, et les extrémités sont munies d'armatures, avant qu'on effectue le surmoulage. Deux bagues faissant partie du moule assurent l'écartement des armatures au futur revêtement et une séparation entre la masse de moulage et les armatures. Simultanément avec le moulage on gonfle les extrémités du jonc en injectant une résine durcissable dans chaque armature.A process corresponding to this definition is known, see for example patent document FR-A-1 603 508. According to this document, the rod is first coated with an insulating sheet, and the ends are provided with reinforcements, before that we perform overmolding. Two rings forming part of the mold ensure the spacing of the reinforcements for the future coating and a separation between the molding mass and the reinforcements. Simultaneously with the molding, the ends of the rod are inflated by injecting a curable resin into each frame.

Après le moulage, on enlève les bagues et on les remplace par un joint d'étanchéité. Ce procédé présente quelques inconvénients:

  • D'abord le volume circulaire qui est occupé lors du moulage par la bague de séparation et qui doit être rempli plus tard par le joint d'étanchéité constitue une zone faible en ce qui concerne la pénétration ultérieure d'humidité dans le jonc de l'isolateur.
After molding, the rings are removed and replaced with a seal. This process has some drawbacks:
  • First, the circular volume which is occupied during the molding by the separation ring and which must be filled later by the seal constitutes a weak zone with regard to the subsequent penetration of moisture into the rod of the insulator.

En outre, au moment de la coulée, la température du dispositif de moulage est de l'ordre de quelque centaines de degrés Celsius selon l'isolant utilisé, par exemple 200°C; les pièces des moules en acier, les armatures généralement en aluminium ou analogue, et le jonc en fibres de verre, se dilatent de manière différente, et il en résulte des contraintes sur le jonc et sur les armatures qui peuvent être à l'origine de dégradations ultérieures de la qualité de l'ancrage des armatures.In addition, at the time of casting, the temperature of the molding device is of the order of a few hundred degrees Celsius depending on the insulation used, for example 200 ° C; the parts of the steel molds, the reinforcements generally of aluminum or the like, and the rod in glass fibers, expand in a different way, and this results in stresses on the rod and on the reinforcements which may be the cause of subsequent degradation of the quality of the anchoring of the reinforcements.

Enfin, le matériau de scellement du jonc risque de se trouver endommagé du fait qu'il est soumis à la température élévée du moule.Finally, the sealing material of the rod risks being damaged because it is subjected to the high temperature of the mold.

La présente invention a pour but de mettre en oeuvre un procédé permettant d'éviter ces inconvénients.The object of the present invention is to implement a method making it possible to avoid these drawbacks.

Ce but est atteint par le procédé tel qu'il est caractérisé dans la revendication 1.This object is achieved by the method as characterized in claim 1.

Un tel procédé est économique car il met en oeuvre un dispositif de moulage simple, et n'implique aucune opération délicate de mise en place dans le moule du jonc et de ses armatures; de plus, il évite l'apparition dans l'isolateur des contraintes mécaniques rappelées plus haut et il assure une bonne résistance à l'humidité.Such a method is economical because it implements a simple molding device, and does not involve any delicate operation of positioning in the mold of the rod and its reinforcements; in addition, it avoids the appearance in the insulator of the mechanical stresses mentioned above and it provides good resistance to humidity.

L'invention sera décrite ci-après plus en détail à l'aide d'un mode de réalisation donné à titre illustratif mais nullement limitatif; dans le dessin annexé:

  • - la figute 1 est une vue partielle schématique en élévation semicoupée d'un isolateur dans son moule après injection du matériau isolant,
  • - la figure 2 est une vue partielle en coupe correspondant à une partie agrandie de la figure 1,
  • - la figure 3 montre schématiquement l'opération de rétreint de l'armature sur le jonc.
The invention will be described below in more detail using an embodiment given by way of illustration but in no way limiting; in the attached drawing:
  • FIG. 1 is a schematic partial view in semi-cut elevation of an insulator in its mold after injection of the insulating material,
  • FIG. 2 is a partial sectional view corresponding to an enlarged part of FIG. 1,
  • - Figure 3 schematically shows the shrinking operation of the frame on the rod.

On voit sur les figures deux armatures 2 et 2' et un jonc 1 en fibres de verre agglomérées sur les extrémités duquel on a enfilé respectivement deux joints dont seul le joint 5 est visible. Ce joint 5 se trouve dans un logement défini par un épaulement 4 proche du bord de la cavité 3 de l'armature 2. Il subsiste un jeu entre la face extrême 6 du jonc 1 et le fond 7 de la cavité 3. Le joint 5 ferme la cavité 3 et définit ainsi un logement pour le scellement ultérieur le l'extrémité du jonc 1. L'extrémité opposée du jonc 1 est disposée de la même manière dans l'armature 2'. Les armatures 2 et 2' associées au jonc 1 sont placées dans les cavités de deux moules extrêmes 10 et 10', dont l'écartement est fixe et parfaitement défini; le réglage des positions des armatures est extrêmement facile.We see in the figures two reinforcements 2 and 2 'and a rod 1 made of agglomerated glass fibers on the ends of which two seals have been threaded, of which only the seal 5 is visible. This seal 5 is located in a housing defined by a shoulder 4 close to the edge of the cavity 3 of the frame 2. There remains a clearance between the end face 6 of the rod 1 and the bottom 7 of the cavity 3. The seal 5 closes the cavity 3 and thus defines a housing for the subsequent sealing of the end of the rod 1. The opposite end of the rod 1 is arranged in the same way in the frame 2 '. The frames 2 and 2 'associated with the rod 1 are placed in the cavities of two extreme molds 10 and 10', the spacing of which is fixed and perfectly defined; adjusting the armature positions is extremely easy.

Pour limiter le plus possible les inconvénients dûs aux problèmes de dilatation, on peut effectuer l'opération précédente à une température modérée, par exemple de l'ordre de 100°C, permettant la manipulation aisée des divers éléments.To minimize the drawbacks due to expansion problems, the previous operation can be carried out at a moderate temperature, for example of the order of 100 ° C, allowing easy handling of the various elements.

La position du jonc ayant été réglée dans ses armatures, on met en place des demi-coquilles intermédiaires 11 et 12 et on effectue le moulage du revêtement isolant 13, par exemple par coulée ou par injection.The position of the rod having been adjusted in its frames, intermediate half-shells 11 and 12 are put in place and the insulating coating 13 is molded, for example by casting or by injection.

Sous l'effet de la pression de coulée ou d'injection du matériau isolant, le joint 5 est fermement appliqué contre l'épaulement 4 et assure l'étanchéité de la cavité 3.Under the effect of the pressure of casting or injecting the insulating material, the seal 5 is firmly applied against the shoulder 4 and seals the cavity 3.

Après refroidissement, on réalise hors du moule les scellements à chaque extrémité du jonc dans la cavité correspondante.After cooling, the seals are made out of the mold at each end of the rod in the corresponding cavity.

Pour cela, l'armature 2 comporte deux orifices faisant communiquer la cavité 3 avec l'extérieur. L'orifice 20 sert à l'introduction d'un matériau de scellement, tandis que l'orifice 21 sert à l'évacuation de l'air. Après le remplissage de la cavité 3, on visse ou on emmanche à force dans les orifices des bouchons de fermeture non illustrés. Remarquons qu'il est également possible de réaliser l'opération de remplissage lorsque l'armature comporte un seul orifice.For this, the frame 2 has two holes communicating the cavity 3 with the outside. The orifice 20 is used for the introduction of a sealing material, while the orifice 21 is used for the evacuation of the air. After filling the cavity 3, it is screwed or force-fitted into the orifices of the closure caps not shown. Note that it is also possible to carry out the filling operation when the armature has a single orifice.

S'il s'avérait avantageux d'effectuer l'opération de scellement avant que l'ensemble soit refroidi, on pourrait utiliser un matériau de scellement du type compound, époxy chargée, polymérisable dans de telles conditions de température. Bien entendu toute autre méthode de scellement équivalente peut être envisagée.If it turns out to be advantageous to carry out the sealing operation before the assembly is cooled, a sealing material of the compound, charged epoxy, polymerizable under such temperature conditions could be used. Of course, any other equivalent sealing method can be considered.

Comme on peut le voir sur la figure 3, la liaison entre le jonc 1 et son armature 30 peut être réalisée par rétreint après la sortie du moule. On a référencé 30 l'armature avant le rétreint schématisé par la flèche 100, et 30' cette même armature après rétreint. On pourra utiliser tout mode de rétreint connu. Le joint 35 est fortement comprimé en 35'.As can be seen in Figure 3, the connection between the rod 1 and its frame 30 can be achieved by shrinking after leaving the mold. The frame has been referenced 30 before the necking shown diagrammatically by the arrow 100, and 30 ′ this same frame after necking. We can use any known shrinking mode. The seal 35 is strongly compressed in 35 '.

Enfin, on peut mettre en oeuvre un procédé de liaison comme celui qui est décrit dans le brevet FR-A-2419571. Un tel procédé comporte une phase de pré-rétreint du collet de l'armature sur le joint 5 pour améliorer encore l'étanchéité avant le moulage du revêtement 13; il se termine par un scellement du jonc dans l'armature à l'aide d'un matériau de scellement.Finally, it is possible to implement a linking method such as that described in patent FR-A-2419571. Such a method includes a phase of pre-shrinking the collar of the reinforcement on the seal 5 to further improve the seal before molding the coating 13; it ends with a sealing of the rod in the reinforcement using a sealing material.

Claims (5)

1. A method of manufacturing an organic insulator comprising a rod (1) made of agglomerated fibres, the ends of which are made fast in two respective end fittings (2, 2'), and comprising an insulating covering (13) which covers the rod (1) between the two end fittings (2, 2') and is obtained by moulding, characterized in that first a seal (5) is fitted on each end of the rod (1), that then the two end fittings (2, 2') are placed on the rod (1), said seal (5) fitting against a shoulder (4) in the inside edge of the corresponding end fitting (2), that the assembly formed by the rod and the end fittings is disposed in a moulding apparatus (10, 10', 11, 12), that the relative positions of said end fittings (2, 2') and of said rod (1) are adjusted therein, said insulating covering (13) is moulded, and finally said ends of the rod (1) are made fast with said end fittings (2,2').
2. A manufacturing method according to claim 1, characterized in that each end of the rod (1) is made fast to its end fitting (2) by inserting an embedding substance in the cavity (3) through at least one opening (20) in the end fitting (2) provided for this purpose and communicating with the outside.
3. A manufacturing method according to claim 1, characterized in that each end of the rod (1) is made fast to its end fitting (30) by shrinking said end fitting (30) onto said end (arrow 100).
4. A manufacturing method according to claim 1, characterized in that before disposing said assembly formed by the rod and the end fittings in said moulding apparaturs (10, 10', 11, 12), said assembly is brought to a temperature of several tens of ° C.
5. A manufacturing method according to claim 4, characterized in that said temperature is about 100° C.
EP82104641A 1981-06-01 1982-05-27 Method of making an organic insulator Expired EP0066261B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82104641T ATE15957T1 (en) 1981-06-01 1982-05-27 PROCESS FOR MAKING AN ORGANIC INSULATOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8110773 1981-06-01
FR8110773A FR2506997A1 (en) 1981-06-01 1981-06-01 METHOD FOR MANUFACTURING AN ORGANIC INSULATOR

Publications (2)

Publication Number Publication Date
EP0066261A1 EP0066261A1 (en) 1982-12-08
EP0066261B1 true EP0066261B1 (en) 1985-10-02

Family

ID=9259044

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82104641A Expired EP0066261B1 (en) 1981-06-01 1982-05-27 Method of making an organic insulator

Country Status (6)

Country Link
US (1) US4476081A (en)
EP (1) EP0066261B1 (en)
AT (1) ATE15957T1 (en)
CA (1) CA1190727A (en)
DE (1) DE3266650D1 (en)
FR (1) FR2506997A1 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1185406B (en) * 1985-10-10 1987-11-12 Rebosio Ind Elettrotecnia Spa INSULATOR FOR ELECTRIC LINES AND ITS MANUFACTURING PROCEDURE
FR2604821B1 (en) * 1986-10-02 1990-01-12 Ceraver COMPOSITE INSULATOR WITH OVER-MOLDED INSULATING COATING
US5233132A (en) * 1986-10-02 1993-08-03 Sediver Societe Europeenne D'isolateurs En Composite insulator comprising a fiber-resin rod and an insulating coating molded thereover
JP2588676B2 (en) * 1992-12-28 1997-03-05 日本碍子株式会社 Non-ceramic insulator forming equipment
JP2664616B2 (en) * 1993-03-25 1997-10-15 日本碍子株式会社 Airtight structure of non-ceramic insulator
JP2820380B2 (en) * 1995-02-21 1998-11-05 日本碍子株式会社 Method for manufacturing polymer insulator
JP2905416B2 (en) * 1995-03-20 1999-06-14 日本碍子株式会社 End part forming method of composite insulator and end part forming jig used therefor
JP3157710B2 (en) * 1996-02-29 2001-04-16 日本碍子株式会社 Polymer LP insulator and method of manufacturing the same
JPH09259673A (en) * 1996-03-18 1997-10-03 Ngk Insulators Ltd Manufacture of compound insulator
US5945636A (en) * 1996-04-22 1999-08-31 Hubbell Incorporated Electrical insulators with mechanical core and dielectric sheath
JPH10188707A (en) * 1996-12-27 1998-07-21 Ngk Insulators Ltd Molding method of compound insulator and metal mold device used therefor
US5877453A (en) * 1997-09-17 1999-03-02 Maclean-Fogg Company Composite insulator
US5986216A (en) * 1997-12-05 1999-11-16 Hubbell Incorporated Reinforced insulator
WO2003023792A1 (en) * 2001-09-12 2003-03-20 Obschestvo S Ogranichennoi Otvetstvennostyu Ooo Alfa Energo High-voltage polymeric insulator
US6930254B2 (en) * 2003-08-14 2005-08-16 Electric Power Research Institute Chemically-doped composite insulator for early detection of potential failures due to exposure of the fiberglass rod
US7709743B2 (en) * 2007-10-15 2010-05-04 Hubbell Incorporated Integrated insulator seal and shield assemblies

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA669608A (en) * 1963-09-03 H. Gardener Reginald Encapsulating electrical components
CH497030A (en) * 1967-11-03 1970-09-30 Siemens Ag Process for the production of an insulator reinforced with glass fibers from cast resin
CH492287A (en) * 1969-07-04 1970-06-15 Sprecher & Schuh Ag Method for producing a cast resin body, in particular a hollow-cylindrical electrical insulating body
GB1233310A (en) * 1969-08-04 1971-05-26
BE790501A (en) * 1971-10-26 1973-04-25 Westinghouse Electric Corp CAST CAPACITOR TERMINAL
JPS6054730B2 (en) * 1978-03-02 1985-12-02 日本碍子株式会社 Synthetic resin insulator
FR2419571A2 (en) * 1978-03-09 1979-10-05 Ceraver Sealed couplings for electrical switchgear levers - involving a ductile coupling crimped onto a rubber sheath
CH640973A5 (en) * 1978-06-02 1984-01-31 Micafil Ag Method for producing an insulating rod, which is resistant to tension, compression and torsion and has attachment fittings, and a device for carrying out the method
US4253817A (en) * 1978-07-27 1981-03-03 Martin Concrete Engineering Company Concrete railroad tie casting and handling system
US4241004A (en) * 1979-04-23 1980-12-23 Hervig Harold C High voltage splice

Also Published As

Publication number Publication date
FR2506997B1 (en) 1983-12-16
ATE15957T1 (en) 1985-10-15
US4476081A (en) 1984-10-09
EP0066261A1 (en) 1982-12-08
FR2506997A1 (en) 1982-12-03
DE3266650D1 (en) 1985-11-07
CA1190727A (en) 1985-07-23

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