DE2432057A1 - METHOD OF MANUFACTURING AN ELECTRICALLY INSULATING TUBE COUPLING BLOCK - Google Patents

Description

lending. Pipe coupling blocks

The invention relates to an electrically insulating pipe coupling sblοck, "consisting of an outer socket pipe part and an inner epee tube part, both of which are different have paddling and collar parts protruding in radial directions, with between the two in the transverse direction of the tubes directed end faces of a radially outwardly directed collar located on the inner tube end of the epee tube on the one hand and the end surfaces of a flange part and opposite the end surfaces on both sides of this collar of a collar part of the socket pipe, on the other hand, one pressure-resistant each Isolating ring is mounted, of which the after

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Dr. REINHOLD SCHMIDT, 7603 OPPENAU, PO Box 25, Allmendplatz 4, phone (07804) 710

Root of the socket ring to be mounted insulating ring is surrounded by two in the ring grooves of the adjacent flat and collar surfaces mounted rubber-elastic ti see O-rings as a primary seal, and in a chamber, which at both ends of the opposing surface parts of the two insulating rings is completed, a rubber-elastic ring is located as a secondary seal, and in addition, the nested pipe parts are fixed to one another in a clamped state by a bracing weld attached to the socket part When the tension welding seam was inserted as a preformed rubber profile, a very considerable pressure was required under which the tension welding was applied _o Because it was necessary to fill in all the air cavities in the chamber on the inserted molded body of the secondary seal and by ensuring that no electrical breakdown occurred at these critical points.However, this meant that the unpressed molded rubber body introduced into the chamber had to be stressed so heavily before the tension weld was made that the small edges and cavities were filled by local flow of the rubber. But that required a very high level of force

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for deformation, which had to be taken into account in the static calculation of the other construction parts. The parts of the pipe coupling block had to be held together with a very high clamping force during welding which required a considerable amount of mechanical equipment with greater efficiency,

The aim of the invention is to simplify the production of such insulating pipe couplings so that, without the insulating and sealing properties of the finished product, with only a small fraction of what was previously possible required pressure forces and thus with a significant less technical effort is needed to attach the parts of the coupling to be connected when the bracing weld is applied to squeeze together.

This goal can be achieved by the fact that in the production of an insulating coupling block of the type mentioned According to the invention, the procedure is such that after inserting the O-rings, the bracing welds with simultaneous Application of a slight axial pressure on the assembled O-rings leading to the sealing deformation Pipe parts is attached, and that then the secondary seal by pouring liquid, later to one

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elastic body hardening rubber compound in a designated Filling opening is introduced into the chamber, whereupon after elastic solidification of this rubber compound, the filling opening sealed with a stopper and the opening of the block on the free face by potting with epoxy resin will.

The rubber filled in the liquid state fills all cavities and gaps of the chamber space made available to it without the application of external pressure _e Since only a very small deformation force is required for deforming the two O-rings, so is the tension force under which the construction must be kept for the welding of the last weld seam, very small and does not represent a burden to be taken into account for the production and the technical effort required for it _o In this way, very large nominal widths can be clamped together with little effort. You can even do without hydraulic devices and provide mechanically acting individual devices so that several pieces can be assembled and welded at the same time.

For reasons of assembly technology, it has been found to be expedient that the bracing weld seam is at the root

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of the socket part from the front side between the upper Edge of the outer flange surface and the underside of the previously free socket end there «, Pur die A silicone rubber can advantageously be used for the secondary seal which is initially filled in liquid form with the addition of hardener as a 2-component body and then, depending on the type of reagent additive used, hardened to an elastic rubber body in a time counting minutes or hours

The method is explained with reference to the illustrated on the drawing, the embodiment of such a coupling block The schematic half-sectional drawing showing the preferably to be inserted in a pipeline by welding insulating block with its connecting pipe parts 1 and 2 ₀ On a radially outwardly projecting flanged 3 of the pipe part 1 is, as will be explained in more detail below, a socket part 4 is welded on, which at its free end has a radially inwardly projecting collar 5 of the socket part comes to rest. On both sides of the collar 6, there are two pressure-resistant insulating rings 7 and 8, which for example consist of plastic-soaked (laminated) hard tissue or hard paper

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The insulating ring 7 is surrounded on both sides by O-rings 9 made of rubber, which are each located in an annular groove 10 in the plan 3 or ₀ in the collar 6. The depth of these annular grooves is such that the rubber O-rings 9 are just sufficiently deformed when the bush 6 is pushed against the surface 3 by axial pressure o The O-rings then form a secure seal (primary seal). Between the above the circumferential surface parallel boundary surface of the sleeve 6, the local opposing, slightly rounded Plächen form of at * - the insulating rings emerged 7 and 8, the front end closure ends of a first free chamber 11, the internal between the sleeve 6 and the outer sleeve 4 is. At the top of this chamber, which also runs around the entire block, the sleeve has a filling opening 12 for the secondary sealing compound made of initially liquid rubber compound that later hardens to form an elastic body "

The isolation coupling block is completed in the Way that first one O-ring 9 is inserted into the annular groove 10 of the flat pipe part 1, 3 and then the insulating ring 7 The second O-ring 9 now becomes the ring groove 10 of the socket part 6 of the epee tube 2 is inserted and this tube part is pushed against the end face of the insulating ring 7.

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The second insulating ring 8 is now placed on the back of the socket 6, and the sleeve part 4, which is loose there, becomes with its Terminating socket 5 placed outside.

Under slight pressure in the axial direction, the parts are then pushed together so that the O-rings 9 are then pressed completely into the closed off by the insulating ring 7 ring grooves 10 and rings sealingly abut ₀ While maintaining this light Achsdruckes will now from the outer face of the flange 3 from the bracing weld 13 attached to the assembled pipe parts. To make this easier, recesses are made on the upper outer end edge of the flange 3 and on the inwardly directed side of the end of the sleeve 4, in which the weld seam can be securely attached to the root of the sleeve ring. After the welding has been completed, the length of the insulating and sealing block has now been determined

Now follows the introduction of the secondary seal into the. Chamber 11 ο For this purpose, a liquid rubber mass is passed through the Filling opening 12 poured in, e.g. a mass of silicone rubber with hardener additive. This 2-component mass fills the chamber 11 and all cavities and in the liquid state

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any gaps on the connection surfaces and forms after the subsequent setting by the reaction The components have a solid rubber-elastic body that secures the potential-different metallic parts separates from each other and also prevented the occurrence of dangerous glow discharges by removing all cavities the solidification of the unpressurized rubber compound is the filling opening 12 through a stopper, not shown locked. Also, the ring opening 14 on the free end face of the block in the usual way with epoxy resin or shed like that. The now finished block can then, as is also usual, with an epoxy ^ bitumen protective layer to be wrapped

The finished block represents one of screws, bolts and the like free, solid, handy unit group, which may be incorporated in any desired dimensions as insulation shield in cables and is largely insensitive due to its closed configuration against corrosive influences _o

Claims;

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Claims (1)

24320S7 ~ 9 claims ^r 1 o ^ Process for the production of an electrically insulating pipe coupling block, consisting of an outer socket pipe part and an inner epee tube part, both of which have planschund collar parts protruding in different radial directions, with one located on the inner tube end of the epee tube between the two end faces directed in the transverse direction of the tubes , radially outwardly directed collar, on the one hand, and the end faces of a facing part and a collar part of the socket pipe opposite the end faces on both sides of this collar, on the other hand, each have a pressure-resistant insulating ring mounted, of which the insulating ring, which is to be mounted to the root of the socket ring, has two in grooves in the adjacent facing and collar surfaces mounted rubber-elastic O-rings is surrounded as a primary seal, and in a chamber which is closed off at its two front ends by the surface parts of the two insulating rings that are opposite in the axial direction Rubber-elastic ring is located as a secondary seal, and in addition, the nested pipe parts in the clamped state by a attached to the socket part 509811/0665 - ίο ~ Bracing weld seams are fixed to one another, characterized in that after inserting the O-rings (9) the bracing weld seam (13) with the simultaneous use of a light, for sealing Deformation of the O-rings leading to axial pressure is applied to the assembled pipe parts, and that then the secondary seal by pouring in liquid that later hardens to form an elastic body Rubber compound is introduced into a filling opening (12) provided for this purpose in the chamber (11), whereupon after elastic This rubber compound solidifies the filling opening closed by stopper and the opening of the block on the free end face by potting with epoxy resin (14) will,, 2t, method according to claim 1, characterized in that the bracing weld seam (13) is placed at the root of the socket part from the front side between the upper edge of the outer flat surface (3) and the underside of the socket end (4) there until then free _O 3ο method according to claim 1, characterized in that a silicone rubber is used as the liquid rubber for the secondary seal is used with Harterzusatζ o ο / ο ο 509811/0665 ~ 11 - Electrically insulating pipe coupling block, manufactured according to claims 1, 2 or 3> characterized in that the filled in the liquid state and then "On cooling, elastic rubber bodies solidified the entire, completely filled the chamber space (11) made available to him 509811/0665 Blank page