CH269913A

CH269913A - Process for manufacturing a seal between an insulating body and a metal sheath and seal obtained by this process.

Info

Publication number: CH269913A
Authority: CH
Inventors: Telephone Et Radio S Standard
Original assignee: Standard Telephone & Radio Sa
Priority date: 1941-04-25
Filing date: 1947-03-08
Publication date: 1950-07-31

Description

Procede de fabrication d'un joint entre un Corps isolant et une gaine metallique et joint obtenu par ce procede. La presente invention se rapportet ä ui, proeede de fabrication d'un joint entre un eorps isolant et une gaine metallique, ainsi qu'ä un joint fa.brique selon ee procede. Ce proeede pettt etre titilise pour fixer des gar- nitures inetalliques sur les isolateurs. Des exemples de tels isolateurs sont les inanehons isolants au styrolene, les isolateurs-condensa- teurs coniques et les manehons isolants en por- celaine ou en Garton impregne de resine syn- thetique. Process for manufacturing a seal between an insulating body and a metal sheath and seal obtained by this process. The present invention relates to a method for manufacturing a joint between an insulating body and a metal sheath, as well as a joint made according to this method. This process can be used to attach inmetallic gaskets to insulators. Examples of such insulators are styrolene insulators, conical capacitor insulators, and insulators of porcelain or Garton impregnated with synthetic resin.

Quand an utilise un manelion isolant potir seeller 1'extreinite d'tui säble, il est ordinaire- ment desirable que ledit manehon forme tine Barriere entre 1'huile ou 1e compound du cAble et 1'huile ou 1e compotuicl plane ä 1'exteriettr du manelion. Dans certains Gas, la Pression interne peut eire considerable, ä eause de la Pression statique im.posee par la. Position du säble Jans 1e terrain, jointe aux forces dues ä, la dilatation de 1'huile ou du compotind. Z?n Gas extreme est cel.ui du säble a compression, oü la Pression ä Finterieur du manehon peut atteindre Fordre de 14 atmospheres. When using an insulating sleeve to seal the end of the sand pipe, it is ordinarily desirable that said sleeve form a barrier between the oil or compound of the cable and the oil or compound which is flat on the outside of the cable. manelion. In some Gases, the internal Pressure can be considerable, due to the static Pressure imposed by the. Position of the sand in the ground, together with the forces due to the expansion of the oil or compotind. The gas extreme is that of compression sand, where the pressure inside the handle can reach the order of 14 atmospheres.

Il est relativement simple, de calculer 1e Corps isolant du manehon pour qu'il resiste ä Ces Pressions, mais le point le plus faible est 1e point de fixation de la garniture me- tallique neeessaire potir etablir@la connexion entre 1e e#Lble et les Barres omnibus. Ce joint doit et.re etanche a Fhuile ä la Pression maxi- mum de fonetionnement et eire assen flexible pour s'adapter ä toutes les differenees de di- latation potlvant se produire entre les mate- riaux employes. It is relatively simple to calculate the Insulating Body of the crankpin to resist these Pressures, but the weakest point is the point of attachment of the metal packing necessary to establish the connection between the e#lble and Busbars. This seal must be oil tight at the maximum operating pressure and must be sufficiently flexible to adapt to all the differences in expansion which may occur between the materials used.

Le joint selon Finvention est un moyen simple et peu coüteux d'exeeution d'ttne telle connexion. The joint according to the invention is a simple and inexpensive means of making such a connection.

Le procede de fabrication selon Finvention est caraeterise gen ce qti'on menage au moins tine rainure peripherique Clans ledit Corps iso- lant, en ce qti'on insere un anneau elastique dans ladite rainure, Fanneau etant de dimen- sions telles qu'il remplit pratiquement ent.iere- ment ladite rainure, en ce qu'on applique en- suite la gaine. sur le Corps isolant et c-n ce qu'on forme une rainure dann la gaine ä Fen- droit de la rainure menagee dans 1e eorps iso- lant, la rainure formee dans la gaine d6for- mant cette gaine, de fae an ä exereer une Pres sion sur ledit anneau elastique. The manufacturing process according to the invention is characterized by the fact that at least one peripheral groove is provided in the said insulating body, in that an elastic ring is inserted into the said groove, the ring being of dimensions such that it fills substantially entirely said groove, in that the sheath is then applied. on the insulating body and c-n that a groove is formed in the sheath to the right of the groove provided in the first insulating body, the groove formed in the sheath deforming this sheath, so as to exert a pressure sion on said elastic ring.

Lei joint obtenu par ce procede est carae- terise en ce qu'il eomprend au moins un anneau en eaotitehoue de dimensions telles qu'il remplit pratiqtiement entierement une raintire menagee dans ledit Corps isolant, cet anneau etant soumis ä une Pression du Fait d'tine deformation que presente la gaine, due ä une rainure formee dans la ga.ine ä Fendroit de la, rainure in.enagee dann ledit Corps iso- la.nt. The gasket obtained by this process is characterized in that it comprises at least one ring made of clay of dimensions such that it practically completely fills a groove provided in the said insulating body, this ring being subjected to a pressure due to tine deformation presented by the sheath, due to a groove formed in the ga.ine at the location of the groove in.enagee dann said body isola.nt.

Le dessin ei-joint illustre 1e proeede et re- presente, ä titre d'exemple, une forme d'exe- cution du joint; objet de Finvention, applique au rattachement d'un cône condensateur au styrolène à la terminaison d'im câble de trans port d'énergie électrique à grande puissance. L'unique figure du dessin est une élévation, moitié en coupe, suivant l'axe du câble. The attached drawing illustrates the process and shows, by way of example, one embodiment of the seal; object of the invention, applies to the attachment of a styrolene capacitor cone to the termination of a high-power electric power transmission cable. The only figure in the drawing is an elevation, half in section, along the axis of the cable.

Le câble comprend à sa terminaison une âme 1, un enveloppement 2, une couche uni- qua de ruban de cotopa au caoutchouc au sty rolène 3, un enroulement de papier 4 et une gaine métallique 5. La terminaison porte un cône condensateur au styrolène 6 en forme de manchon, supporté à son extrémité avant par une calotte externe en cuivre 7 et par un tube interne en cuivre 8, et à son extrémité arrière par un assemblage de fermeture 9. L'assemblage 9 comporte un manchon à flasque 10, relié à la gaine métal lique 5 par un joint plombé 11, et une gaine de cuivre 12 s'adaptant étroitement à la par tie arrière cylindrique du cône condensa teur 6. The cable comprises at its termination a core 1, a wrapping 2, a single layer of cotopa tape with styrene rubber 3, a winding of paper 4 and a metal sheath 5. The termination carries a styrene capacitor cone 6 in the form of a sleeve, supported at its front end by an outer copper cap 7 and by an inner copper tube 8, and at its rear end by a closure assembly 9. The assembly 9 comprises a flanged sleeve 10, connected to the metal sheath 5 by a leaded joint 11, and a copper sheath 12 fitting tightly to the cylindrical rear part of the condenser cone 6.

Dans la partie cylindrique du cône con densateur 6, une ou plusieurs rainures péri phériques sont pratiquées à la machine. Elles sont représentées, dans l'exemple choisi, comme étant de section rectangulaire, bien que toute autre forme de section puisse con venir. Dans ces rainures sont introduits des anneaux de caoutchouc 13. Ces anneaux sont pratiquement de même section que les rai nures, mais leur diamètre intérieur est légère ment plus faible que le diamètre du fond des- dites rainures, de manière qu'une fois en po sition, ces anneaux s'y adaptent étroitement. In the cylindrical part of the cone condenser 6, one or more peripheral grooves are made by machine. They are represented, in the example chosen, as being of rectangular cross-section, although any other cross-sectional shape may be suitable. In these grooves are introduced rubber rings 13. These rings are practically of the same section as the grooves, but their inside diameter is slightly smaller than the diameter of the bottom of said grooves, so that once in inches sition, these rings fit it tightly.

La gaine de cuivre 12 est fixée par ajus tement bloqué léger et étanche sur le cône 6 et sa surface interne est étamée ou revêtue d'un autre produit protecteur, pour éviter une réaction chimique due au contact avec les anneaux de caoutchouc. De plus, il est pré férable, lorsqu'on applique la gaine, de revê tir les surfaces d'un vernis, de manière à scel ler le joint de façon complète. Quand la gaine est en place, elle est emboutie à l'endroit des anneaux de caoutchouc, pour former des rai nures 14 dans la gaine, rainures dont la posi tion correspond avec celle desdits anneaux. Ces _ derniers sont ainsi comprimés et exercent sur tous les côtés des rainures une pression qui empêche efficacement les fuites, par exemple d'un liquide; ou d'une substance d'isolation ou de remplissage occupant les vides dans la ter minaison du câble. Le diamètre du fond des rainures de la gaine 12 est inférieur au dia mètre extérieur de la partie cylindrique du eônei 6, de sorte qu'il n'y a aucune possibilité que ce dernier soit forcé en dehors de la gaine. The copper sheath 12 is fastened by a light and tight locking fit on the cone 6 and its internal surface is tinned or coated with another protective product, to avoid a chemical reaction due to contact with the rubber rings. In addition, it is preferable, when applying the sheath, to coat the surfaces with a varnish, so as to seal the joint completely. When the sheath is in place, it is stamped at the location of the rubber rings, to form grooves 14 in the sheath, grooves whose position corresponds with that of said rings. These _ latter are thus compressed and exert on all sides of the grooves a pressure which effectively prevents leakage, for example of a liquid; or an insulating or filler filling the voids in the cable termination. The diameter of the bottom of the grooves of the sheath 12 is less than the outer diameter of the cylindrical part of the cone 6, so that there is no possibility that the latter is forced out of the sheath.

Une augmentation de pression dans le cône tendra à produire un mouvement relatif entre le cône 6 et la gaine 12, augmentant ainsi la compression du caoutchouc et resserrant le joint. An increase in pressure in the cone will tend to produce relative movement between the cone 6 and the sheath 12, thereby increasing the compression of the rubber and tightening the seal.

Les anneaux de caoutchouc peuvent être de toute composition convenable, s'adaptant à la nature des huiles ou compounds utilisés, aux conditions de température, etc. The rubber rings can be of any suitable composition, adapting to the nature of the oils or compounds used, to the temperature conditions, etc.

A l'extrémité du cône, entre ce dernier et l'organe à flasque 10, un scellement herméti que est obtenu, grâce à une rondelle de caout chouc étanche à l'huile 15, encastrée dans la surface du flasque, et à un remplissage 16 de soudure qui assure une bonne connexion élec trique entre l'électrode extérieure 17 du cône condensateur et les parties métalliques exté rieures du câble. At the end of the cone, between the latter and the flange member 10, a hermetic seal is obtained, thanks to an oil-tight rubber washer 15, embedded in the surface of the flange, and to a filling 16 solder which ensures a good electrical connection between the outer electrode 17 of the capacitor cone and the outer metal parts of the cable.

Le dessin représente l'application du joint à une extrémité seulement du cône. S'il est nécessaire, la même disposition peut être appliquée à l'autre extrémité. The drawing shows the application of the seal to only one end of the cone. If necessary, the same arrangement can be applied to the other end.

Dans le cas d'un manchon simple, sans électrodes de commande de potentiel, les deux extrémités du manchon seraient traitées de la même faon et la position et la mise en place des gaines métalliques seraient semblables à celles représentées au dessin. In the case of a simple sleeve, without potential control electrodes, the two ends of the sleeve would be treated in the same way and the position and placement of the metal sheaths would be similar to those shown in the drawing.

Claims

CLAIMS I. A method of manufacturing a joint between an insulating body and a metal sheath, characterized in that at least one peripheral groove is provided in said insulating body, in that an elastic ring is inserted into said groove, the ring. being of dimensions such that it practically entirely fills the said groove, in that the sheath is then applied to the first insulating body and in that a groove is formed in the sheath at the location of the groove formed in the insulating body , the groove formed in the sheath deforming the latter so as to exert pressure on said elastic ring. II. Joint manufactured according to the process of claim I, characterized in that it comprises at least one rubber ring of dimensions such that it practically completely fills a groove provided in the said insulating body, this ring being subjected to a pressure due to a deformation presented by the sheath, due to a groove formed in the sheath at the location of the groove made in said insulating body. SUB-CLAIMS 1. Gasket according to Claim II, characterized in that the said metal sheath is fixed to the insulating body by a light and leaktight blocked fit.

2. Joint according to claim II, ca acterized in that the inner surface of the sheath which is in contact with the insulating body has a coating intended to prevent a chemical reaction likely to occur between the sheath and the rubber ring.

3. Seal according to claim II, ca acterized in that its outer surface is coated with a varnish after application of the sheath.

4. Joint according to claim II, charac terized in that the groove of the insulating body and the rubber ring have a rectangular cross section.

5. Joint according to claim II, ca acterized in that said sheath surrounds the insulating body.

6. Seal according to sub-claim 5, characterized in that the rubber ring has an inside diameter slightly less than the diameter of the bottom of the groove of the insulating body in which it is placed.

7. Joint according to claim II, ca acterized in that the insulating body is a styrolene sleeve.

8. Joint according to claim II, ca acterized in that said insulating body is a capacitor termination cone of a cable for transporting electrical energy.