EP1091365A1 - Manufacturing process of a hollow composite insulator and hollow composite insulator - Google Patents

Manufacturing process of a hollow composite insulator and hollow composite insulator Download PDF

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Publication number
EP1091365A1
EP1091365A1 EP99119832A EP99119832A EP1091365A1 EP 1091365 A1 EP1091365 A1 EP 1091365A1 EP 99119832 A EP99119832 A EP 99119832A EP 99119832 A EP99119832 A EP 99119832A EP 1091365 A1 EP1091365 A1 EP 1091365A1
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EP
European Patent Office
Prior art keywords
tube
silicone rubber
plastic
htv
shield
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Granted
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EP99119832A
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German (de)
French (fr)
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EP1091365B1 (en
Inventor
Joachim Pimper
Rainer F. Röder
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Axicom AG
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Cellpack AG
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Priority to AT99119832T priority Critical patent/ATE308106T1/en
Priority to EP99119832A priority patent/EP1091365B1/en
Priority to DE59912714T priority patent/DE59912714D1/en
Publication of EP1091365A1 publication Critical patent/EP1091365A1/en
Application granted granted Critical
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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies

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  • the invention relates to a method for manufacturing a hollow composite insulator for medium and High voltage, in which a plastic tube, in particular a glass fiber reinforced epoxy tube, with a shield is made of silicone. Furthermore, the Invention a hollow composite insulator, in which a Plastic pipe, especially a glass fiber reinforced Epoxy tube with a silicone shield is.
  • the RTV silicone rubber components can be poured or injected into the shape surrounding the tube, which determines the shape of the shielding, due to the liquid RTV silicone rubber components, with low pressure, and the polymerization takes place at room temperature or with only a small amount of heat, so that there is no risk that the properties of the plastic tube, which is generally a glass fiber reinforced epoxy tube, which are decisive for the insulator, are impaired by the process of applying the shielding.
  • a disadvantage of this manufacturing process is the long vulcanization time or the long time until demolding.
  • the application of the finished, cooled parts to the pipe is labor-intensive and the shielding, which is composed of several parts or the shielding with joints, harbors the risk of leaks, so that, in addition to the extension of the leakage current path, the shielding has another important function as protection of the It is not as safe to ensure that the isolator is protected against moisture as with a pipe that is directly cast or molded.
  • the invention is based on the object Manufacturing process for a hollow insulator with a silicone rubber shield to create which is simple and can be carried out quickly and therefore inexpensively.
  • This task is carried out in a process for Production of a hollow composite insulator at the beginning mentioned type solved in that the silicone rubber shield by injection molding of hot vulcanizing Silicone rubber is formed, at least during part of the injection molding process at least one area of the plastic pipe against the pressure of the silicone rubber material is supported.
  • the pressure sensitive Plastic pipe when injecting the HTV silicone rubber against harmful pressure or combined pressure and temperature influences are protected.
  • the plastic pipe is overmoulded all over Supported length, preferably by a metal tube, which inserted into the plastic tube with little play and is removed again after the spraying process.
  • HTV silicone rubber is also used, whose vulcanization temperature is below the softening temperature of the plastic or epoxy tube is and is preferably at most about 130 ° C.
  • the invention is further based on the object to create a hollow composite insulator that with at least as good properties as the known ones Composite insulators with RTV silicone rubber cast or Injection molding shield, quicker and cheaper to manufacture is.
  • the composite insulator has an HTV silicone rubber shield it is faster and thus less expensive to manufacture, because on the one hand that HTV raw material is cheaper and on the other hand as a result the very short vulcanization time a high production rate is possible.
  • Figure 1 shows schematically a hollow composite insulator 1 in vertical cross section.
  • the composite insulator has a support tube 2, which is usually a glass fiber reinforced epoxy tube.
  • the tube 2 is in usually on both sides with metal fasteners 3 and 4, which e.g. are made of aluminum can and forms the cavity 7 of the insulator.
  • a shield 5 which is made of a silicone rubber material is formed. This shield extended the leakage current path between the fasteners 3 and 4 and serves in particular as a hydrophobic Protection against moisture.
  • the roughly shown schematically Composite insulator 1 is only an example of a special embodiment of such an insulator shown.
  • the insulator 1 could also have one held therein
  • Conductor 6 can be configured as shown in FIG.
  • Such isolators can come in various sizes and designs and for the most diverse electrical medium and High-voltage systems, which, as is known, is not continued here. Under middle and In the present case, high voltages are said to be electrical voltages of greater than approx. 1000 volts can be understood.
  • the shape of the shield 5 can be very different and is wavy in section here only as an example shown.
  • a shield 5 made of RTV silicone rubber material Its two components are transformed into one Cast mold that surrounds the epoxy tube 2 and the RTV silicone rubber material crosslinks at room temperature and possibly a small amount of heat, e.g. within an hour.
  • FIG. 2 shows that already provided with the flanges 3 and 4 glass fiber reinforced epoxy tube 2 of an insulator according to Figure 1, which tube with the flanges in the lower part 8th an injection mold is arranged.
  • the upper half of the mold 8 ' is only partially indicated in FIG. 2 but corresponding to the lower half 8 in the figure Cover the upper area of pipe 2 and flanges 3 and 4.
  • the shape 8, 8 ' forms a around the tube 2 Cavity 9, which is to be applied in its shape Shielding 5 corresponds.
  • the epoxy tube 2 is at least partially supported to the necessary for injection molding with HTV silicone rubber material withstand high pressures.
  • FIG. 2 shows that the tube 10 is only part of the length of the Tube 2 covers, in the example shown essentially only the parts that are not covered by the flanges are.
  • the tube 10 could also be longer and e.g. still have a section 11, which in the Figure 2 is shown with broken lines, wherein this section extends to the left end in the figure of the tube 2 extends.
  • a portion 12 of the metal tube 10 could be provided be, which extends all the way to the back.
  • the Pipe 10 could also be provided with a flange 13, which would then also be embedded in the form 8, 8 '.
  • the tube 10 preferably has a complete outer surface and lies with this on the inner surface of the tube 2nd on, but there may also be recesses in the tube 10 be so that the epoxy tube is only partially supported becomes.
  • the tube 2 is now known Way in an injection molding machine by not shown Openings in the closed, so with both Halved form the HTV silicone rubber material introduced under high pressure into the cavity 9 of the mold.
  • the injection pressure can e.g. in the range of 300 - 1,000 bar, which for pipe 2 thanks to the support 10 there is no risk of a defect.
  • the used HTV silicone rubber material is a commercially available material but which is selected so that the vulcanization temperature low, e.g. In the range of 100 ° C to 160 ° C.
  • Preferred is e.g. an HTV silicone rubber material from Wacker Chemie, with the designation Powersil 310, which has a vulcanization temperature of approx. 130 ° C.
  • the vulcanization temperature of the HTV material can of course be different selected as 130 ° C, but is for HTV materials usually higher than 100 ° C and, as I said, should Safety distance from the softening temperature of the Plastic tube or epoxy tube 2 or to that for the Pipe 2 is considered a permissible temperature of e.g. 180 ° C adhere.
  • the injection molding process is otherwise different not from known injection molding processes.
  • the Form 8, 8 'can be heated to a uniform and to result in rapid vulcanization.
  • An insulator shield 5 can be completed in this way within a few minutes and the insulator are removed from the mold become.
  • the tube 10 After removal from the mold, the tube 10 removed from the isolator and this is for further processing ready.
  • the support tube 10 can be in the next Epoxy tube 2 are inserted, which then in the Mold is introduced, followed by another injection molding process can take place.
  • the injection mold can thus immediately can be used again without a long wait.
  • the shape of the Insulator 1 to be understood only as an example.
  • the isolator could also have a conductor 6, as in FIG. 1, for which corresponding in the two mold halves 8, 8 ' Recesses must be provided.
  • Figure 3 shows an example roughly schematically a glass fiber reinforced epoxy tube 2, which in turn is provided with flanges 3 and 4, and with its front part embedded in the mold halves 8 and 8 ' is.
  • the resulting insulator 1 is included a conductor 6 equipped.
  • the cavity 9 in the mold halves 8 and 8 ' is explained with HTV material below filled with high pressure. This way the front one Half of the tube 2 provided with the shield 5, which after demolding in Figure 4 can be seen. With two further mold halves 18 and 18 'with the cavity 19 4 then becomes the rear part of the shield 5 added.
  • the number of injection molding steps is included not limited to two, but can still include more steps.

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  • Insulating Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Insulators (AREA)
  • Glass Compositions (AREA)

Abstract

The method for producing a hollow compound insulator (1) for medium and high voltages involves formation of a screening (5) of HTV (high temperature vulcanizing) silicone rubber around a plastic pipe (2) by injection molding. At least a section of the plastic pipe is supported against the pressure of the silicone rubber material at least during a part of the injection molding process. Also claimed is a resultant hollow compound insulator.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines hohlen Verbundisolators für Mittel- und Hochspannung, bei welchem ein Kunststoffrohr, insbesondere ein glasfaserverstärktes Epoxidrohr, mit einer Beschirmung aus Silikon versehen wird. Ferner betrifft die Erfindung einen hohlen Verbundisolator, bei welchem ein Kunststoffrohr, insbesondere ein glasfaserverstärktes Epoxidrohr, mit einer Beschirmung aus Silikon versehen ist.The invention relates to a method for manufacturing a hollow composite insulator for medium and High voltage, in which a plastic tube, in particular a glass fiber reinforced epoxy tube, with a shield is made of silicone. Furthermore, the Invention a hollow composite insulator, in which a Plastic pipe, especially a glass fiber reinforced Epoxy tube with a silicone shield is.

Verbundisolatoren der obengenannten Art sind bekannt. Zu deren Herstellung wird das auf herkömmliche Weise mit metallischen Endstücken, z.B. Flanschen aus Aluminium, versehene Kunststoffrohr mit Silikonkautschuk umgossen, um die Silikonbeschirmung des Verbundisolators zu bilden. Dabei werden flüssige, kalthärtende Silikonkautschukmassen (RTV = Room Temperature Vulcanizing oder LSR = Liquid Silicone Rubber) verwendet. Das Eingiessen oder Einspritzen der RTV-Silikonkautschukkomponenten in die die Gestalt der Beschirmung bestimmende, das Rohr umgebende Form kann aufgrund der flüssigen RTV-Silikonkautschukkomponenten mit geringem Druck erfolgen und die Polymerisation erfolgt bei Raumptemperatur oder unter nur geringer Wärmezufuhr, so dass keine Gefahr besteht, dass die für den Isolator massgebenden Eigenschaften des Kunststoffrohres, welches in der Regel ein glasfaserverstärktes Epoxidrohr ist, durch den Aufbringprozess der Beschirmung verschlechtert werden. Nachteilig an diesem Herstellverfahren ist die lange Vulkanisationszeit bzw. die lange Dauer bis zur Entformung. Composite insulators of the type mentioned above are known. To manufacture them, the plastic tube provided with conventional metal end pieces, for example flanges made of aluminum, is encapsulated with silicone rubber in order to form the silicone shield of the composite insulator. Liquid, cold-curing silicone rubber compounds (RTV = R oom T emperature V ulcanizing or LSR = Liquid Silicone Rubber) are used. The RTV silicone rubber components can be poured or injected into the shape surrounding the tube, which determines the shape of the shielding, due to the liquid RTV silicone rubber components, with low pressure, and the polymerization takes place at room temperature or with only a small amount of heat, so that there is no risk that the properties of the plastic tube, which is generally a glass fiber reinforced epoxy tube, which are decisive for the insulator, are impaired by the process of applying the shielding. A disadvantage of this manufacturing process is the long vulcanization time or the long time until demolding.

Es ist daher schon vorgeschlagen worden, Beschirmungsteile für solche Hohlisolatoren aus heissvulkanisierendem Silikonkautschuk bzw. HTV-Silikonkautschuk (HTV = High Temperature Vulcanizing) separat herzustellen und diese fertigen Teile, z.B. als ringförmige Teile, auf das Rohr aufzuschieben oder als bandförmige Teile auf das Rohr aufzuwickeln. Die Herstellung der Teile kann dabei aus dem hochviskosen HTV-Silikonkautschuk bei hohen Drükken und hoher Temperatur in Spritzgussmaschinen mit hoher Kadenz erfolgen, da eine genügende Vulkanisation bzw. Aushärtung bis zur Entformung nur sehr kurze Zeit erfordert. Das Aufbringen der fertigen, erkalteten Teile auf das Rohr ist hingegen arbeitsintensiv und die aus mehreren Teilen zusammengesetzte Beschirmung bzw. die Beschirmung mit Fugen birgt die Gefahr von Undichtigkeiten, so dass die, neben der Verlängerung des Kriechstromweges, weitere wichtige Funktion der Beschirmung als Schutz des Isolators vor Feuchtigkeit nicht so sicher zu gewährleisten ist, wie bei einem direkt umgossenen oder umspritzten Rohr.It has therefore been proposed to produce shielding parts of such hollow insulators of heissvulkanisierendem silicone rubber or HTV silicone rubber (HTV = H igh t emperature V ulcanizing) separately and these finished parts, for example, as annular members, pushed onto the pipe or as a tape-shaped parts wind up the tube. The parts can be made from the highly viscous HTV silicone rubber at high pressures and high temperature in injection molding machines with high cadence, since sufficient vulcanization or curing takes only a very short time to remove from the mold. The application of the finished, cooled parts to the pipe, on the other hand, is labor-intensive and the shielding, which is composed of several parts or the shielding with joints, harbors the risk of leaks, so that, in addition to the extension of the leakage current path, the shielding has another important function as protection of the It is not as safe to ensure that the isolator is protected against moisture as with a pipe that is directly cast or molded.

Bei Langstabisolatoren mit einem vollen Kern aus Glasfasern und Epoxidharz, der aufgrund des vollen Querschnittes hohen Druck aufnehmen kann, ist schon HTV-Silikonkautschukmasse zur Bildung der Beschirmung im Spritzgussverfahren eingesetzt worden; bei Hohlisolatoren hingegen ist dies aufgrund der Druck- und kombinierten Druck/Temperaturempfindlichkeit des Glasfaser/Epoxidrohres nicht möglich.Long rod insulators with a full core made of glass fibers and epoxy resin, which due to the full HTV silicone rubber compound is capable of absorbing high pressure to form the shielding in Injection molding has been used; for hollow insulators however, this is due to the print and combined Pressure / temperature sensitivity of the glass fiber / epoxy tube not possible.

Der Erfindung liegt die Aufgabe zugrunde, ein Herstellverfahren für einen Hohlisolator mit einer Silikonkautschukbeschirmung zu schaffen, welches einfach und rasch und damit kostengünstig durchführbar ist.The invention is based on the object Manufacturing process for a hollow insulator with a silicone rubber shield to create which is simple and can be carried out quickly and therefore inexpensively.

Diese Aufgabe wird bei einem Verfahren zur Herstellung eines hohlen Verbundisolators der eingangs genannten Art dadurch gelöst, dass die Silikonkautschukbeschirmung durch Spritzgiessen von heissvulkanisierendem Silikonkautschuk gebildet wird, wobei mindestens während eines Teils des Spritzgiessvorganges mindestens ein Bereich des Kunststoffrohres gegen den Druck des Silikonkautschukmaterials abgestützt wird.This task is carried out in a process for Production of a hollow composite insulator at the beginning mentioned type solved in that the silicone rubber shield by injection molding of hot vulcanizing Silicone rubber is formed, at least during part of the injection molding process at least one area of the plastic pipe against the pressure of the silicone rubber material is supported.

Durch die Abstützung kann das druckempfindliche Kunststoffrohr beim Einspritzen des HTV-Silikonkautschuks gegen schädliche Druck- bzw. kombinierte Druck- und Temperatureinflüsse geschützt werden. Bevorzugterweise wird das Kunststoffrohr auf seiner ganzen umspritzten Länge abgestützt, vorzugsweise durch ein Metallrohr, welches mit geringem Spiel in das Kunststoffrohr eingesetzt ist und nach dem Spritzvorgang wieder entnommen wird. Bevorzugterweise wird ferner ein HTV-Silikonkautschuk verwendet, dessen Vulkanisationstemperatur unterhalb der Erweichungstemperatur des Kunststoff- bzw. Epoxidrohres liegt und vorzugsweise bei höchstens ca. 130°C liegt.The pressure sensitive Plastic pipe when injecting the HTV silicone rubber against harmful pressure or combined pressure and temperature influences are protected. Preferably the plastic pipe is overmoulded all over Supported length, preferably by a metal tube, which inserted into the plastic tube with little play and is removed again after the spraying process. Preferably HTV silicone rubber is also used, whose vulcanization temperature is below the softening temperature of the plastic or epoxy tube is and is preferably at most about 130 ° C.

Der Erfindung liegt weiter die Aufgabe zugrunde, einen hohlen Verbundisolator zu schaffen, der, bei mindestens gleichguten Eigenschaften wie die bekannten Verbundisolatoren mit RTV-Silikonkautschuk-Guss- bzw. Spritzgiessbeschirmung, rascher und kostengünstiger herstellbar ist.The invention is further based on the object to create a hollow composite insulator that with at least as good properties as the known ones Composite insulators with RTV silicone rubber cast or Injection molding shield, quicker and cheaper to manufacture is.

Diese Aufgabe wird bei einem hohlen Verbundisolator der eingangs genannten Art durch die kennzeichnenden Merkmale des Anspruchs 5 gelöst.This task is done with a hollow composite insulator of the type mentioned above by the characteristic Features of claim 5 solved.

Dadurch, dass der Verbundisolator eine HTV-Silikonkautschukbeschirmung aufweist, ist er rascher und damit kostengünstiger herstellbar, da einerseits das HTV-Rohmaterial kostengünstiger ist und andererseits infolge der sehr kurzen Vulkanisationszeit eine hohe Herstellkadenz möglich ist. Because the composite insulator has an HTV silicone rubber shield it is faster and thus less expensive to manufacture, because on the one hand that HTV raw material is cheaper and on the other hand as a result the very short vulcanization time a high production rate is possible.

Im folgenden werden Ausführungsbeispiele der Erfindung anhand der Figuren näher erläutert. Dabei zeigt:

  • Figur 1 eine Schnittansicht eines hohlen Verbundisolators;
  • Figur 2 eine Schnittansicht des in eine Hälfte einer Spritzgussform eingebetteten hohlen Verbundisolators noch ohne Silikonkautschukbeschirmung;
  • Figur 3 grob schematisch den ersten Schritt eines zweistufigen Spritzgussverfahrens; und
  • Figur 4 den an den ersten Schritt von Figur 3 anschliessenden zweiten Schritt zur Herstellung der Beschirmung.
    • Exemplary embodiments of the invention are explained in more detail below with reference to the figures. It shows:
  • Figure 1 is a sectional view of a hollow composite insulator;
  • FIG. 2 shows a sectional view of the hollow composite insulator embedded in one half of an injection mold, without a silicone rubber shield;
  • FIG. 3 roughly schematically the first step of a two-stage injection molding process; and
  • Figure 4 shows the second step following the first step of Figure 3 for the manufacture of the shield.

    • Figur 1 zeigt schematisch einen hohlen Verbundisolator 1 im Vertikalquerschnitt. Der Verbundisolator weist ein Tragrohr 2 auf, welches in der Regel ein glasfaserverstärktes Epoxidrohr ist. Das Rohr 2 ist in der Regel beidseits mit metallischen Befestigungselementen 3 und 4 versehen, welche z.B. aus Aluminium bestehen können und bildet den Hohlraum 7 des Isolators. Zwischen den Befestigungselementen 3 und 4 ist der Isolator mit einer Beschirmung 5 versehen, welche von einem Silikonkautschukmaterial gebildet wird. Diese Beschirmung verlängert die Kriechstromstrecke zwischen den Befestigungselementen 3 und 4 und dient insbesondere als hydrophober Schutz gegen Feuchtigkeit. Der grob schematisch dargestellte Verbundisolator 1 ist dabei nur als Beispiel für eine spezielle Ausführungsform eines solchen Isolators gezeigt. Der Isolator 1 könnte auch mit einem darin gehaltenen Leiter 6 ausgestaltet sein, wie er in Figur 1 mit unterbrochenen Linien angedeutet ist. Derartige Isolatoren können in verschiedensten Grössen und Ausführungen und für die verschiedensten elektrischen Mittel- und Hochspannungsanlagen ausgeführt sein, was, da bekannt, hier nicht weiter ausgeführt wird. Unter Mittel- und Hochspannung sollen dabei vorliegend elektrische Spannungen von grösser als ca. 1000 Volt verstanden werden. Die Form der Beschirmung 5 kann dabei sehr verschieden sein und ist hier nur als Beispiel im Schnitt wellenförmig dargestellt. Wie bereits erwähnt, wird ein solcher Verbundisolator mit Hohlraum 7 nach Stand der Technik mit einer Beschirmung 5 aus RTV-Silikonkautschukmaterial gebildet. Dabei werden dessen zwei Komponenten in eine entsprechende Form gegossen, welche das Epoxidrohr 2 umgibt und das RTV-Silikonkautschukmaterial vernetzt bei Raumtemperatur und allenfalls geringfügiger Wärmezufuhr z.B. innerhalb einer Stunde.Figure 1 shows schematically a hollow composite insulator 1 in vertical cross section. The composite insulator has a support tube 2, which is usually a glass fiber reinforced epoxy tube. The tube 2 is in usually on both sides with metal fasteners 3 and 4, which e.g. are made of aluminum can and forms the cavity 7 of the insulator. Between the fasteners 3 and 4 is the isolator a shield 5 which is made of a silicone rubber material is formed. This shield extended the leakage current path between the fasteners 3 and 4 and serves in particular as a hydrophobic Protection against moisture. The roughly shown schematically Composite insulator 1 is only an example of a special embodiment of such an insulator shown. The insulator 1 could also have one held therein Conductor 6 can be configured as shown in FIG. 1 is indicated with broken lines. Such isolators can come in various sizes and designs and for the most diverse electrical medium and High-voltage systems, which, as is known, is not continued here. Under middle and In the present case, high voltages are said to be electrical voltages of greater than approx. 1000 volts can be understood. The The shape of the shield 5 can be very different and is wavy in section here only as an example shown. As already mentioned, such a composite insulator with cavity 7 according to the prior art a shield 5 made of RTV silicone rubber material. Its two components are transformed into one Cast mold that surrounds the epoxy tube 2 and the RTV silicone rubber material crosslinks at room temperature and possibly a small amount of heat, e.g. within an hour.

    Gemäss der Erfindung wird nun anders vorgegangen, indem ein Umspritzen des Rohres 2 unter hohem Druck mit HTV-Silikonkautschukmaterial erfolgt. Figur 2 zeigt das bereits mit den Flanschen 3 und 4 versehene glasfaserverstärkte Epoxidrohr 2 eines Isolators gemäss Figur 1, welches Rohr mit den Flanschen im unteren Teil 8 einer Spritzgussform angeordnet ist. Die obere Formhälfte 8' ist in der Figur 2 nur teilweise angedeutet, würde aber entsprechend der unteren Hälfte 8 den in der Figur oberen Bereich des Rohres 2 und der Flansche 3 und 4 abdecken. Die Form 8, 8' bildet um das Rohr 2 herum einen Hohlraum 9, welcher in seiner Form der aufzubringenden Beschirmung 5 entspricht. Gemäss der Erfindung wird nun das Epoxidrohr 2 mindestens teilweise abgestützt, um den beim Spritzgiessen mit HTV-Silikonkautschukmaterial notwendigen hohen Drücken zu widerstehen. Im gezeigten Beispiel ist zur Abstützung ein Rohr 10, z.B. aus Metall, in das Rohr 2 hineingeschoben. Das Rohr 10 sitzt dabei nicht mit einem Passsitz im Rohr 2, sondern weist in diesem ein geringes Spiel von z.B. 0.1 - 1 mm auf. Das Rohr 10 kann somit einfach in das Rohr 2 eingeschoben und auch wieder aus diesem entfernt werden. In der Figur 2 ist dargestellt, dass das Rohr 10 nur einen Teil der Länge des Rohres 2 abdeckt, im gezeigten Beispiel im wesentlichen nur die Teile, die nicht von den Flanschen abgedeckt sind. Das Rohr 10 könnte aber durchaus auch länger sein und z.B. noch einen Abschnitt 11 aufweisen, was in der Figur 2 mit unterbrochenen Linien dargestellt ist, wobei sich dieser Abschnitt bis an das in der Figur linke Ende des Rohres 2 erstreckt. Auch am rechten Ende des Rohres 2 könnte ein Abschnitt 12 des Metallrohres 10 vorgesehen sein, welcher sich bis ganz nach hinten erstreckt. Das Rohr 10 könnte auch mit einem Flansch 13 versehen sein, welcher dann auch in der Form 8, 8' eingebettet wäre. Vorzugsweise hat das Rohr 10 eine vollständige Aussenfläche und liegt mit dieser an der Innenfläche des Rohres 2 an, es können aber auch Ausnehmungen im Rohr 10 vorhanden sein, so dass das Epoxidrohr nur teilweise abgestützt wird.According to the invention, the procedure is now different. by overmolding the tube 2 under high Printing with HTV silicone rubber material. Figure 2 shows that already provided with the flanges 3 and 4 glass fiber reinforced epoxy tube 2 of an insulator according to Figure 1, which tube with the flanges in the lower part 8th an injection mold is arranged. The upper half of the mold 8 'is only partially indicated in FIG. 2 but corresponding to the lower half 8 in the figure Cover the upper area of pipe 2 and flanges 3 and 4. The shape 8, 8 'forms a around the tube 2 Cavity 9, which is to be applied in its shape Shielding 5 corresponds. According to the invention the epoxy tube 2 is at least partially supported to the necessary for injection molding with HTV silicone rubber material withstand high pressures. In the example shown is a tube 10, e.g. made of metal, in pushed the tube 2 in. The tube 10 is not seated with a snug fit in tube 2, but instructs in this slight play of e.g. 0.1 - 1 mm. The tube 10 can thus simply inserted into the tube 2 and again be removed from this. FIG. 2 shows that the tube 10 is only part of the length of the Tube 2 covers, in the example shown essentially only the parts that are not covered by the flanges are. The tube 10 could also be longer and e.g. still have a section 11, which in the Figure 2 is shown with broken lines, wherein this section extends to the left end in the figure of the tube 2 extends. Also at the right end of the pipe 2 a portion 12 of the metal tube 10 could be provided be, which extends all the way to the back. The Pipe 10 could also be provided with a flange 13, which would then also be embedded in the form 8, 8 '. The tube 10 preferably has a complete outer surface and lies with this on the inner surface of the tube 2nd on, but there may also be recesses in the tube 10 be so that the epoxy tube is only partially supported becomes.

    Zum Umspritzen des Rohres 2 wird nun auf bekannte Weise in einer Spritzgussmaschine durch nicht dargestellte Öffnungen in der geschlossenen, also mit beiden Hälften versehenen Form das HTV-Silikonkautschukmaterial unter hohem Druck in den Hohlraum 9 der Form eingebracht. Der Spritzdruck kann dabei z.B. im Bereich von 300 - 1'000 bar liegen, was für das Rohr 2 dank der Abstützung 10 keine Gefahr eines Defektes ergibt. Das verwendete HTV-Silikonkautschukmaterial ist ein handelsübliches Material, welches aber so ausgewählt ist, dass die Vulkanisationstemperatur niedrig liegt, z.B. im Bereich von 100°C bis 160°C. Bevorzugt ist z.B. ein HTV-Silikonkautschukmaterial der Firma Wacker Chemie, mit der Bezeichnung Powersil 310, welches eine Vulkanisationstemperatur von ca. 130°C aufweist. Auf diese Weise wird sichergestellt, dass die maximale für das glasfaserverstärkte Epoxidrohr zulässige Temperatur, welche z.B. bei 180°C liegen kann, nicht überschritten wird. Die Vulkanisationstemperatur des HTV-Materials kann natürlich auch anders als 130°C gewählt werden, liegt aber für HTV-Materialien in der Regel höher als 100°C und sollte, wie gesagt, einen Sicherheitsabstand zu der Erweichungstemperatur des Kunststoffrohres bzw. Epoxidrohres 2 bzw. zu der für das Rohr 2 als zulässig erachteten Temperatur von z.B. 180°C einhalten. Der Spritzgiessprozess unterscheidet sich ansonsten nicht von bekannten Spritzgiessprozessen. Die Form 8, 8' kann beheizt sein, um eine gleichmässige und rasche Vulkanisation zu ergeben. Eine Isolatorbeschirmung 5 kann auf diese Weise innert wenigen Minuten fertiggestellt werden und der Isolator aus der Form entnommen werden. Nach der Entnahme aus der Form wird das Rohr 10 aus dem Isolator entnommen und dieser ist zur Weiterbearbeitung bereit. Das Abstützrohr 10 kann in das nächste Epoxidrohr 2 eingeführt werden, welches danach in die Form eingebracht wird, worauf ein erneuter Spritzgussvorgang stattfinden kann. Die Spritzgussform kann somit unmittelbar, ohne lange Wartezeit, erneut verwendet werden.To overmold the tube 2 is now known Way in an injection molding machine by not shown Openings in the closed, so with both Halved form the HTV silicone rubber material introduced under high pressure into the cavity 9 of the mold. The injection pressure can e.g. in the range of 300 - 1,000 bar, which for pipe 2 thanks to the support 10 there is no risk of a defect. The used HTV silicone rubber material is a commercially available material but which is selected so that the vulcanization temperature low, e.g. In the range of 100 ° C to 160 ° C. Preferred is e.g. an HTV silicone rubber material from Wacker Chemie, with the designation Powersil 310, which has a vulcanization temperature of approx. 130 ° C. This ensures that the maximum for the glass fiber reinforced Epoxy tube permissible temperature, which e.g. at 180 ° C may lie, is not exceeded. The vulcanization temperature of the HTV material can of course be different selected as 130 ° C, but is for HTV materials usually higher than 100 ° C and, as I said, should Safety distance from the softening temperature of the Plastic tube or epoxy tube 2 or to that for the Pipe 2 is considered a permissible temperature of e.g. 180 ° C adhere. The injection molding process is otherwise different not from known injection molding processes. The Form 8, 8 'can be heated to a uniform and to result in rapid vulcanization. An insulator shield 5 can be completed in this way within a few minutes and the insulator are removed from the mold become. After removal from the mold, the tube 10 removed from the isolator and this is for further processing ready. The support tube 10 can be in the next Epoxy tube 2 are inserted, which then in the Mold is introduced, followed by another injection molding process can take place. The injection mold can thus immediately can be used again without a long wait.

    Anstelle der beschriebenen bevorzugten Abstützung mittels eines Rohres 10 sind natürlich auch andere Möglichkeiten zur Abstützung des Rohres 2 möglich, so kann z.B. das Rohr 2 mit einer Flüssigkeit, z.B. einem Öl, gefüllt und dicht verschlossen werden, so dass die inkompressible Flüssigkeit im Innern des Rohrs 2 die Abstützung bildet.Instead of the preferred support described by means of a tube 10 are of course also others Possibilities for supporting the pipe 2 are possible, for example the pipe 2 with a liquid, e.g. one Oil, filled and tightly sealed so that the incompressible liquid inside the tube 2 the support forms.

    Auch in Figur 2 ist natürlich die Form des Isolators 1 nur als Beispiel zu verstehen. Der Isolator könnte auch auch einen Leiter 6, wie in Figur 1, aufweisen, für welche in den beiden Formhälften 8, 8' entsprechende Ausnehmungen vorgesehen sein müssen.In Figure 2, of course, the shape of the Insulator 1 to be understood only as an example. The isolator could also have a conductor 6, as in FIG. 1, for which corresponding in the two mold halves 8, 8 ' Recesses must be provided.

    Bei grösseren Isolatoren, welche durchaus Längen von mehreren Metern erreichen können, kann das Umspritzen mit dem HTV-Silikonkautschukmaterial auch in mehreren Schritten erfolgen. Figur 3 zeigt als Beispiel grob schematisch ein glasfaserverstärktes Epoxidrohr 2, welches wiederum mit Flanschen 3 und 4 versehen ist, und mit seinem vorderen Teil in den Formhälften 8 und 8' eingebettet ist. Der entstehende Isolator 1 ist dabei mit einem Leiter 6 ausgestattet. Der Hohlraum 9 in den Formhälften 8 und 8' wird wie erläutert mit HTV-Material unter hohem Druck gefüllt. Auf diese Weise wird die vordere Hälfte des Rohres 2 mit der Beschirmung 5 versehen, welcher nach der Entformung in Figur 4 ersichtlich ist. Mit zwei weiteren Formhälften 18 und 18' mit dem Hohlraum 19 wird dann gemäss Figur 4 der hintere Teil der Beschirmung 5 angefügt. Auf diese Weise können mit gleichen oder verschiedenen Formstücken auch sehr lange Isolatoren hergestellt werden. Die Anzahl der Spritzgussschritte ist dabei nicht auf zwei beschränkt, sondern kann auch noch mehr Schritte umfassen. Es ist natürlich auch möglich, nur einen Teil des Epoxidrohres 2 mit HTV-Material zu umspritzen und die restlichen Bereiche z.B. mit vorgefertigten Beschirmungsteilen zu versehen.With larger insulators, which definitely Overmoulding can reach lengths of several meters with the HTV silicone rubber material also in several steps. Figure 3 shows an example roughly schematically a glass fiber reinforced epoxy tube 2, which in turn is provided with flanges 3 and 4, and with its front part embedded in the mold halves 8 and 8 ' is. The resulting insulator 1 is included a conductor 6 equipped. The cavity 9 in the mold halves 8 and 8 'is explained with HTV material below filled with high pressure. This way the front one Half of the tube 2 provided with the shield 5, which after demolding in Figure 4 can be seen. With two further mold halves 18 and 18 'with the cavity 19 4 then becomes the rear part of the shield 5 added. This way you can use the same or different Fittings also made very long insulators become. The number of injection molding steps is included not limited to two, but can still include more steps. Of course it is also possible to overmold only part of the epoxy tube 2 with HTV material and the remaining areas e.g. with pre-made To provide shielding parts.

    Claims (6)

    Verfahren zur Herstellung eines hohlen Verbundisolators (1) für Mittel- und Hochspannung, bei welchem ein Kunststoffrohr (2), insbesondere ein glasfaserverstärktes Kunststoff-, vorzugsweise Epoxidrohr, mit einer Silikonkautschukbeschirmung (5) versehen wird, dadurch gekennzeichnet, dass die Beschirmung (5) durch Spritzgiessen von heissvulkanisierendem (HTV-) Silikonkautschuk gebildet wird, wobei mindestens während eines Teils des Spritzgiessvorganges mindestens ein Abschnitt des Kunststoffrohres gegen den Druck des Silikonkautschukmaterials abgestützt wird.Process for making a hollow Composite insulator (1) for medium and high voltage, at which a plastic tube (2), in particular a glass fiber reinforced Plastic, preferably epoxy, with a silicone rubber shield (5) is provided, thereby characterized in that the shielding (5) Injection molding of hot vulcanizing (HTV) silicone rubber is formed, at least during one At least one section during the injection molding process of the plastic pipe against the pressure of the silicone rubber material is supported. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Abstützung von einem in das Kunststoffrohr (2) eingeschobenem weiteren Rohr (10), insbesondere einem Metallrohr, gebildet wird.A method according to claim 1, characterized in that the support from one into the plastic tube (2) inserted another tube (10), in particular a metal tube is formed. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass ein HTV-Silikonkautschuk verwendet wird, der eine Vulkanisationstemperatur unterhalb der Erweichungstemperatur des Kunststoffrohres (2) aufweist, insbesondere im Bereich von 100°C bis 160°C und insbesondere eine Vulkanisationstemperatur von ca. 130°C.A method according to claim 1, characterized in that an HTV silicone rubber is used, which is a vulcanization temperature below the softening temperature of the plastic tube (2), in particular in the range from 100 ° C to 160 ° C and in particular a vulcanization temperature of approx. 130 ° C. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Beschirmung (5) in mehreren Abschnitten entlang der Länge des Rohres (2) aufgebracht wird.Method according to one of claims 1 to 3, characterized in that the shield (5) in several sections along the length of the tube (2) is applied. Hohles Mittel- oder Hochspannungsisolatorelement mit einem Tragrohr (2) aus Kunststoff, insbesondere einem glasfaserverstärkten Epoxidrohr, und einer Beschirmung (5) aus Silikonkautschuk, dadurch gekennzeichnet, dass die Beschirmung (5) mindestens teilweise aus direkt um das Tragrohr (2) spritzgegossenen HTV-Silikonkautschukmaterial gebildet ist.Hollow medium or high voltage insulator element with a support tube (2) made of plastic, in particular a glass fiber reinforced epoxy tube, and a shield (5) made of silicone rubber, characterized in that that the shielding (5) at least partially injection molded HTV silicone rubber material directly around the support tube (2) is formed. Hohles Mittel- oder Hochspannungsisolatorelement nach Anspruch 5, dadurch gekennzeichnet, dass dieses einen Leiter (6) aufweist.Hollow medium or high voltage insulator element according to claim 5, characterized in that this has a conductor (6).
    EP99119832A 1999-10-07 1999-10-07 Manufacturing process of a hollow composite insulator Expired - Lifetime EP1091365B1 (en)

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    AT99119832T ATE308106T1 (en) 1999-10-07 1999-10-07 METHOD FOR PRODUCING A HOLLOW COMPOSITE INSULATOR
    EP99119832A EP1091365B1 (en) 1999-10-07 1999-10-07 Manufacturing process of a hollow composite insulator
    DE59912714T DE59912714D1 (en) 1999-10-07 1999-10-07 Process for producing a hollow composite insulator

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    CN109698049A (en) * 2018-12-29 2019-04-30 长园高能电气股份有限公司 A kind of Novel combined insulator and its production technology
    CN112117067A (en) * 2020-10-12 2020-12-22 中国南方电网有限责任公司超高压输电公司贵阳局 Integrated hollow composite insulator with mounting flange insulation structure and manufacturing method

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    DE59912714D1 (en) 2005-12-01
    ATE308106T1 (en) 2005-11-15

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