EP0217103B1 - Transformer with a moulded insulative encapsulation - Google Patents

Transformer with a moulded insulative encapsulation Download PDF

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Publication number
EP0217103B1
EP0217103B1 EP86111589A EP86111589A EP0217103B1 EP 0217103 B1 EP0217103 B1 EP 0217103B1 EP 86111589 A EP86111589 A EP 86111589A EP 86111589 A EP86111589 A EP 86111589A EP 0217103 B1 EP0217103 B1 EP 0217103B1
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EP
European Patent Office
Prior art keywords
transformer
coil former
winding
feature
core
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Expired
Application number
EP86111589A
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German (de)
French (fr)
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EP0217103A1 (en
Inventor
Peter Dipl.-Ing. Bradt
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Siemens AG
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Siemens AG
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Priority to AT86111589T priority Critical patent/ATE43454T1/en
Publication of EP0217103A1 publication Critical patent/EP0217103A1/en
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Publication of EP0217103B1 publication Critical patent/EP0217103B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/022—Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/005—Impregnating or encapsulating

Definitions

  • the invention relates to a transformer with a cast insulating jacket, in particular for underfloor airfield lighting.
  • Such transformers are recessed into the runways of airfields with the connected headlights and, in addition to a small installation space, must have complete tightness and resistance to alkalis, acids and sea water, in particular to ensure operational safety.
  • a high-voltage-resistant, insulating-coated transformer in particular for use in underfloor airport lighting systems, is to be created which, despite simple manufacture and only a small size, can ensure the tightness and required resistance to sea water and alkalis and acids.
  • connection rubber bushings which are pre-fixed on the coil former and already co-injected during the production of the sheathing during cooling of the insulating sheath in the sense of a press connection with a high sealing pressure of the injection molding compound are enclosed.
  • the connection rubber bushings are used to hold the active part to be overmolded, at least consisting of core, bobbin with primary or secondary winding and pre-fixed connection means for holding in the injection mold until the overmolded insulating compound has
  • the coil former 2 used in the transformer according to the invention is shown in FIGS. 1 to 3.
  • the winding space for the primary winding 7 is located between the right end flange 21 and the opposite central flange 23, and the winding space for the secondary winding 8 is located between the left end flange 22 and the opposite central flange 24.
  • At the top of the coil former 2 are 21 on the right end flange 21 two brackets 25, 26 for the pre-fixed mounting of connection rubber bushings 3, 4 for the primary winding 7 and on the upper side of the left end flange 22, a mounting bracket 27 for pre-fixed mounting of a connection rubber bushing 5 for the secondary winding 8 is also molded.
  • Fig. 4 shows a single connecting rubber bushing 4, which receives in its center a connecting means for the respective winding end and an outer connecting line and has a molded in the side of this connecting means a pin 41 in the rubber sleeve with which the connecting rubber bushing 4 to the in Fig. 3 mounts shown and can be prefixed.
  • a plug-in sleeve 10 is inserted as a connection means into the connection rubber bushing.
  • One winding end of the primary or secondary winding 7 or 8 is inserted and soldered or crimped into the lower sleeve part protruding from the connecting rubber bushing;
  • a plug connected to the stripped part of an outer connecting line is inserted into the upper sleeve part, the stripped part of the outer connecting line being pressed directly or indirectly into the recess 42 of the connecting rubber bushing.
  • an outer connecting intermediate line is vulcanized into the connecting rubber bushing 4 as a prefabricated connecting component, the inner stripped end 92 of which protrudes from the connecting rubber bushing, each with one winding end of the primary or Secondary winding 7; 8 is connected.
  • connection rubber bushings 3 The assembly of the entire bobbin 2 with all pre-fixed connection rubber bushings can be seen in Figures 5, 6 and 9.
  • the high-voltage primary winding has two separate connection rubber bushings 3, 4, each with a connection means 71 and 72 for connecting an outer line to the primary winding 7; in the single rubber socket 5 for the secondary winding 8, both connection means 81, 82 for the outer line and the winding ends of the secondary winding 8 are combined.
  • FIGS. 7, 8 show the wound and equipped active part of the transformer according to FIG. 5 or FIG. 6 after the molded insulating jacket;
  • FIG. 10 shows the view of the active part of the transformer according to FIG. 9 after its injection-molded casing.
  • spacer webs 28 are attached to the inner surfaces of the rectangular coil core of the coil body 2, which comprises the inserted iron core, such that the transformer iron core 1 is held at a distance from the coil body 2 in accordance with the height of the distance webs 28 the resulting space between the transformer iron core 1 and the coil body 2 and thus the primary winding 7 and secondary winding 8 can also be completely filled with the injection-molded insulating material made of elastic thermoplastic.
  • the spacer webs 28 are arranged outside the corners of the mutually abutting inner surfaces of the right-angled coil core of the coil body 2, so that the core corners, at which particularly high field strengths occur, have reliable insulation from the surrounding primary or secondary winding.
  • an earthing strap 6, e.g. welded which protrudes from the injection molded insulating jacket.
  • the wound and equipped active part to be overmolded is advantageously set up in the injection mold by means of its connecting rubber bushings 3-5, so that no further additional external spacing means are necessary which could give rise to dangerous inhomogeneous zones in the insulating jacket .
  • the injection molding compound filled in under high pressure is preferably injected in the direction of the coil axis, so that the transformer is held in the injection mold in the centered position and thus sufficient insulation sheathing guaranteed on all sides.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
  • Insulating Bodies (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

A compact high-voltage transformer resistant to moisture leaching and acids for airport navigation light systems includes primary and secondary windings wound upon a plastic coil form in turn surrounding a central portion of an iron transformer core. Connector socket members retained with prefixation on the coil form are provided with connector sleeves for receiving external leads, the sleeves being conductively connected to the ends of the primary and secondary windings. The transformer core is spaced from the inner surface of the coil form by means of spacer elements molded onto the inner surface of the coil form whereby a layer of thermoplastic synthetic resin material is injected between the core and the coil form during an injection molding operation. The injection molded jacket is the only insulation jacket provided in the transformer assembly.

Description

Die Erfindung bezieht sich auf einen Transformator mit gegossener Isolierummantelung, insbesondere für eine Unterflur-Flugplatzbefeuerung. Derartige Transformatoren werden mit den angeschlossenen Scheinwerfern in Rollbahnen von Flugplätzen versenkt eingelassen und müssen neben einem kleinen Einbauraum insbesondere zur gewährleisteten Betriebssicherheit eine vollständige Dichtigkeit und Resistenz gegen Laugen, Säuren und Meerwasser aufweisen.The invention relates to a transformer with a cast insulating jacket, in particular for underfloor airfield lighting. Such transformers are recessed into the runways of airfields with the connected headlights and, in addition to a small installation space, must have complete tightness and resistance to alkalis, acids and sea water, in particular to ensure operational safety.

Bei einem durch die US-A 4 019 167 bekannten Transformator mit einer Gießharz-Ummantelung zur Anwendung für eine Flugplatzbefeuerung wird der mit Primär- und Sekundärspule umwickelte Transformator-Eisenkern vor dem eigentlichen Gießharz-Umgießen in eine Gummimanschette eingekapselt; durch diese zusätzliche Pufferung sollen u.a. Wärmespannungen und Wärmedehnungen der Eisenkern-Spulen-Einheit von der eigentlichen Gießharz-Außenummantelung ferngehalten werden. Zum Anschluß der äußeren Anschlußleitungen sind mit den Wicklungsenden von Primär- und Sekundärwicklung verbundene Anschlußstifte direkt in die Ummantelung eingegossen; die freien Außenenden dieser Anschlußstifte ragen in die Außenummantelung eingeformte trichterförmige Vertiefungen, in die Gummisteckbuchsen beim Anschluß der Außenleitung eingesteckt werden, die innen mit der Außenleitung verbundene Gegensteckhülsen aufnehmen.In a transformer known from US Pat. No. 4,019,167 with a cast resin sheathing for use in airfield lighting, the transformer iron core wrapped with primary and secondary coils is encapsulated in a rubber sleeve prior to the actual casting resin sheathing; this additional buffering should, among other things, Thermal stresses and thermal expansions of the iron core-coil unit are kept away from the actual cast resin outer jacket. To connect the outer connecting lines, connecting pins connected to the winding ends of the primary and secondary windings are cast directly into the casing; the free outer ends of these connection pins protrude into the outer casing and are formed into funnel-shaped depressions into which rubber plug-in sockets are inserted when the outer line is connected, and which receive mating sleeves connected to the inner line on the inside.

Gemäß Aufgabe vorliegender Erfindung soll ein hochspannungsfester, isolierstoffummantelter Transformator, insbesondere zur Anwendung für Unterflur-Flughafenbefeuerungsanlagen, geschaffen werden, der trotz einfacher Fertigung und nur geringer Baugröße die Dichtigkeit und geforderte Beständigkeit gegen Meerwasser sowie Laugen und Säuren gewährleisten kann.According to the object of the present invention, a high-voltage-resistant, insulating-coated transformer, in particular for use in underfloor airport lighting systems, is to be created which, despite simple manufacture and only a small size, can ensure the tightness and required resistance to sea water and alkalis and acids.

Die Lösung dieser Aufgabe gelingt erfindungsgemäß durch die Lehre des Anspruchs 1; vorteilhafte Ausgestaltungen der Erfindung sind jeweils Gegenstand der Unteransprüche.This object is achieved according to the invention by the teaching of claim 1; advantageous embodiments of the invention are the subject of the dependent claims.

Es hat sich gezeigt, daß der erfindungsgemäße Transformator ohne zusätzliche gesonderte Pufferung des aktiven Teils mit seiner lediglich direkt spritzumgossenen elastischen Ummantelung der auf einen allseitig den Eisenkern beabstandenden Spulenkörper aufgebrachten Wicklung und der Ausspritzung des durch die Distanzstege auf einfache Weise gewährleisteten Zwischenraumes zwischen Eisenkern und Spulenkörper sämtliche gestellten Forderungen nach Dichtigkeit und Beständigkeit gegenüber Erdreich, Meerwasser sowie Laugen und Säuren auch bei größerer Erwärmung des inneren Aktivteils erfüllen kann; das Eindringen von Feuchtigkeit entlang der nach außen geführten Anschlußmittel für die äußere Anschlußleitung wird nunmehr auch dadurch eindeutig verhindert, daß die am Spulenkörper vorfixiert gehaltenen und bei der Herstellung der Ummantelung bereits miteingespritzten Anschluß-Gummibuchsen beim Erkalten der Isolierummantelung im Sinne einer Preßverbindung mit hohem Dichtungsdruck von der Spritzgußmasse umschlossen werden. In vorteilhafter Weise werden die Anschluß-Gummibuchsen zur Halterung des zu umspritzenden, zumindest aus Kern, Spulenkörper mit Primär- bzw. Sekundärwicklung und vorfixiert gehaltenen Anschlußmitteln bestehenden Aktivteils zur Halterung in der Spritzform bis zum Erkalten der umspritzten Isoliermasse mitbenutzt.It has been shown that the transformer according to the invention, without additional separate buffering of the active part, with its only directly injection-molded elastic sheathing of the winding applied to a coil former spacing the iron core on all sides and the injection of the space between the iron core and coil former, which is ensured in a simple manner by the spacer webs requirements for tightness and resistance to soil, sea water as well as alkalis and acids can be met even if the inner active part heats up; The penetration of moisture along the outward connection means for the outer connection line is now also clearly prevented by the fact that the connection rubber bushings which are pre-fixed on the coil former and already co-injected during the production of the sheathing during cooling of the insulating sheath in the sense of a press connection with a high sealing pressure of the injection molding compound are enclosed. Advantageously, the connection rubber bushings are used to hold the active part to be overmolded, at least consisting of core, bobbin with primary or secondary winding and pre-fixed connection means for holding in the injection mold until the overmolded insulating compound has cooled.

Die Erfindung sowie weitere vorteilhafte Ausgestaltungen der Erfindung werden im folgenden anhand eines schematisch dargestellten Ausführungsbeispiels in der Zeichnung näher erläutert; darin zeigen:

  • Fig. 1 eine axiale Draufsicht auf die eine Seite eines noch unbewickelten rechteckigen Spulenkörpers;
  • Fig. 2 den Spulenkörper gemäß Fig. 1 in einer Ansicht auf die eine Stirnseite bzw. im Schnittbild gemäß Schnittverlauf 11-11 in Fig. 1;
  • Fig. 3 eine axiale Ansicht der Oberseite des Spulenkörpers gemäß Fig. 1;
  • Fig. 4 eine erste Ausführung einer Anschluß-Gummibuchse;
  • Fig. 5 den Spulenkörper gemäß Fig. 2 zusätzlich mit Primär- und Sekundärwicklung sowie mit Eisenkern und vorfixierten Anschluß-Gummibuchsen;
  • Fig. 6 den Spulenkörper gemäß Fig. 1 zusätzlich mit Primär- und Sekundärwicklung sowie mit Eisenkern und vorfixerten Anschluß-Gummibuchsen;
  • Fig. 7 den Transformator gemäß Fig. 5 mit zusätzlich formgegossener Isolierummantelung;
  • Fig. 8 den Transformator gemäß Fig. 6 zusätzlich mit Isolierummantelung;
  • Fig. 9 den Spulenkörper gemäß Fig. 3 zusätzlich mit Primär- und Sekundärwicklung sowie mit Eisenkern und vorfixierten Anschluß-Gummibuchsen;
  • Fig. 10 den Transformator gemäß Fig. 9 zusätzlich mit formgegossener Isolierummantelung.
  • Fig. 11 eine zweite Ausführung einer Anschluß-Gummibuchse.
The invention and further advantageous embodiments of the invention are explained in more detail below with reference to a schematically illustrated embodiment in the drawing; show in it:
  • Figure 1 is an axial plan view of one side of a still unwound rectangular bobbin.
  • FIG. 2 shows the coil former according to FIG. 1 in a view of the one end face or in the sectional view according to section 11-11 in FIG. 1;
  • 3 shows an axial view of the upper side of the coil former according to FIG. 1;
  • Fig. 4 shows a first embodiment of a connecting rubber bushing;
  • 5 shows the coil former according to FIG. 2 additionally with primary and secondary windings as well as with iron core and pre-fixed connection rubber bushings;
  • 6 shows the coil former according to FIG. 1 additionally with primary and secondary windings as well as with an iron core and pre-fixed connection rubber bushings;
  • FIG. 7 shows the transformer according to FIG. 5 with an additional molded insulating jacket;
  • FIG. 8 the transformer according to FIG. 6 additionally with an insulating jacket;
  • FIG. 9 the coil former according to FIG. 3 additionally with primary and secondary winding as well as with iron core and pre-fixed connection rubber bushings;
  • FIG. 10 the transformer according to FIG. 9 additionally with molded insulating jacket.
  • Fig. 11 shows a second embodiment of a connecting rubber bushing.

Der bei dem erfindungsgemäßen Transformator verwendete Spulenkörper 2 ist in den Figuren 1 bis 3 dargestellt. Zwischen dem rechten Stirnflansch 21 und dem gegenüberliegenden Mittelflansch 23 befindet sich der Wickelraum für die Primärwicklung 7, zwischen dem linken Stirnflansch 22 und dem gegenüberliegenden Mittelflansch 24 befindet sich der Wickelraum für die Sekundärwicklung 8. An der Oberseite des Spulenkörpers 2 sind an dem rechten Stirnflansch 21 zwei Klammern 25, 26 zur vorfixierten Halterung von Anschluß-Gummibuchsen 3, 4 für die Primärwicklung 7 und an der oberen Seite des linken Stirnflansches 22 ist eine Halterungsklammer 27 zur vorfixierten Halterung einer Anschluß-Gummibuchse 5 für die Sekundärwicklung 8 mitangespritzt.The coil former 2 used in the transformer according to the invention is shown in FIGS. 1 to 3. The winding space for the primary winding 7 is located between the right end flange 21 and the opposite central flange 23, and the winding space for the secondary winding 8 is located between the left end flange 22 and the opposite central flange 24. At the top of the coil former 2 are 21 on the right end flange 21 two brackets 25, 26 for the pre-fixed mounting of connection rubber bushings 3, 4 for the primary winding 7 and on the upper side of the left end flange 22, a mounting bracket 27 for pre-fixed mounting of a connection rubber bushing 5 for the secondary winding 8 is also molded.

Fig. 4 zeigt eine einzelne Anschluß-Gummibuchse 4, die in ihrem Zentrum ein Anschlußmittel für das jeweilige Wicklungsende und eine äußere Anschlußleitung aufnimmt und seitlich zu diesem Anschlußmittel einen in die Gummihülse eingegossenen Stift 41 aufweist, mit der die Anschluß-Gummibuchse 4 an den in Fig. 3 gezeigten Halterungen einsteckbar und dadurch vorfixierbar ist.Fig. 4 shows a single connecting rubber bushing 4, which receives in its center a connecting means for the respective winding end and an outer connecting line and has a molded in the side of this connecting means a pin 41 in the rubber sleeve with which the connecting rubber bushing 4 to the in Fig. 3 mounts shown and can be prefixed.

Als Anschlußmittel ist bei einer ersten Ausführung gemäß Fig. 4 eine Steckhülse 10 in die Anschluß-Gummibuchse eingelassen. In den unteren, aus der Anschluß-Gummibuchse herausragenden Hülsenteil wird jeweils ein Wicklungsende der Primär- bzw. Sekundärwicklung 7 bzw. 8 eingesteckt und angelötet oder verquetscht; in dem oberen Hülsenteil wird ein mit dem abisolierten Teil einer äußeren Anschlußleitung verbundener Stecker eingesteckt, wobei in die Vertiefung 42 der Anschluß-Gummibuchse der abisolierte Teil der äußeren Anschlußleitung mittelbar oder unmittelbar eingedrückt ist. Gemäß Fig. 11 ist als zweite Ausführung eines vorteilhaft abgedichteten Anschlusses in die Anschluß-Gummibuchse 4 als vorgefertigtes Anschluß-Bauteil eine äußere Anschluß-Zwischenleitung einvulkanisiert, deren inneres abisoliertes, aus der Anschluß-Gummibuchse herausragendes Ende 92 mit je einem Wicklungsende der Primär- bzw. Sekundärwicklung 7; 8 verbunden wird.In a first embodiment according to FIG. 4, a plug-in sleeve 10 is inserted as a connection means into the connection rubber bushing. One winding end of the primary or secondary winding 7 or 8 is inserted and soldered or crimped into the lower sleeve part protruding from the connecting rubber bushing; A plug connected to the stripped part of an outer connecting line is inserted into the upper sleeve part, the stripped part of the outer connecting line being pressed directly or indirectly into the recess 42 of the connecting rubber bushing. 11, as a second embodiment of an advantageously sealed connection, an outer connecting intermediate line is vulcanized into the connecting rubber bushing 4 as a prefabricated connecting component, the inner stripped end 92 of which protrudes from the connecting rubber bushing, each with one winding end of the primary or Secondary winding 7; 8 is connected.

Die Bestückung des gesamten Spulenkörpers 2 mit sämtlichen vorfixiert gehalterten Anschluß-Gummibuchsen ist aus den Figuren 5, 6 und 9 entnehmbar. Die Hochspannungs-Primärwicklung weist zwei getrennte Anschluß-Gummibuchsen 3, 4 mit je einem Anschlußmittel 71 bzw. 72 zum Anschluß einer äußeren Leitung an die Primärwicklung 7 auf; in der einzigen Gummi-Anschlußbuchse 5 für die Sekundärwicklung 8 sind beide Anschlußmittel 81, 82 für die äußere Leitung bzw. die Wicklungsenden der Sekundärwicklung 8 zusammengefaßt.The assembly of the entire bobbin 2 with all pre-fixed connection rubber bushings can be seen in Figures 5, 6 and 9. The high-voltage primary winding has two separate connection rubber bushings 3, 4, each with a connection means 71 and 72 for connecting an outer line to the primary winding 7; in the single rubber socket 5 for the secondary winding 8, both connection means 81, 82 for the outer line and the winding ends of the secondary winding 8 are combined.

Die Figuren 7, 8 zeigen den bewickelten und bestückten Aktivteils des Transformators gemäß Fig. 5 bzw. Fig. 6 nach der formgegossenen lsolierummantelung; Fig. 10 zeigt die Ansicht des Aktivteils des Transformators gemäß Fig. 9 nach dessen spritzgegossener Ummantelung.FIGS. 7, 8 show the wound and equipped active part of the transformer according to FIG. 5 or FIG. 6 after the molded insulating jacket; FIG. 10 shows the view of the active part of the transformer according to FIG. 9 after its injection-molded casing.

Wie aus Fig. 2 ersichtlich, sind erfindungsgemäß an den Innenflächen des rechteckigen Spulenkerns des Spulenkörpers 2, der den eingesteckten Eisenkern umfaßt, Distanzstege 28 derart angebracht, daß der Transformator-Eisenkern 1 entsprechend der Höhe der Distanzstege 28 in Abstand vom Spulenkörper 2 gehalten ist und der dadurch entstehende Zwischenraum zwischen dem Transformator-Eisenkern 1 und dem Spulenkörper 2 und damit der Primärwicklung 7 und Sekundärwicklung 8 ebenfalls voll mit dem spritzgegossenen Isolierstoff aus elastischem Thermoplast ausfüllbar ist. Insbesondere ist vorgesehen, daß die Distanzstege 28 außerhalb der Ecken der voreinanderstoßenden den Innenflächen des rechtwinkligen Spulenkerns des Spulenkörpers 2 angeordnet sind, so daß die Kernecken, an denen besonders hohe Feldstärken auftreten, eine sichere Isolation zu der umgebenden Primär- bzw. Sekundärwicklung aufweisen. Wie aus den Figuren 7 bis 10 ersichtlich, kann zusätzlich außen am Blechpaket noch eine Erdungslasche 6 z.B. angeschweißt werden, die aus der spritzgegossenen Isolierummantelung herausragt.As can be seen from FIG. 2, according to the invention, spacer webs 28 are attached to the inner surfaces of the rectangular coil core of the coil body 2, which comprises the inserted iron core, such that the transformer iron core 1 is held at a distance from the coil body 2 in accordance with the height of the distance webs 28 the resulting space between the transformer iron core 1 and the coil body 2 and thus the primary winding 7 and secondary winding 8 can also be completely filled with the injection-molded insulating material made of elastic thermoplastic. In particular, it is provided that the spacer webs 28 are arranged outside the corners of the mutually abutting inner surfaces of the right-angled coil core of the coil body 2, so that the core corners, at which particularly high field strengths occur, have reliable insulation from the surrounding primary or secondary winding. As can be seen from FIGS. 7 to 10, an earthing strap 6, e.g. welded, which protrudes from the injection molded insulating jacket.

Bei der Herstellung der spritzgegossenen lsolierummantelung wird in vorteilhafter Weise der zu umspritzende bewickelte und bestückte Aktivteil mittels seiner Anschluß-Gummibuchsen 3-5 in der Spritzform aufgestellt, so daß keine weiteren zusätzlichen Fremddistanzhaltemittel notwendig sind, die Anlaß für gefährliche inhomogene Zonen in der Isolierummangeltung sein könnten. Vorzugsweise wird die unter hohem Druck eingefüllte Spritzgußmasse in Richtung der Spulenachse angespritzt, derart daß der Transformator in der Spritzform in zentrierter Stellung und somit allseitig gewährleisteter genügender Isolierummantelung gehalten ist.In the manufacture of the injection-molded insulating jacket, the wound and equipped active part to be overmolded is advantageously set up in the injection mold by means of its connecting rubber bushings 3-5, so that no further additional external spacing means are necessary which could give rise to dangerous inhomogeneous zones in the insulating jacket . The injection molding compound filled in under high pressure is preferably injected in the direction of the coil axis, so that the transformer is held in the injection mold in the centered position and thus sufficient insulation sheathing guaranteed on all sides.

Claims (6)

1. Transformer with moulded insulation sheathing, especially for an airport flush-marker lighting system, having the features;
a) primary winding and secondary winding are wound on a plastic coil former (2);
b) held prefixed to the plastic coil former (2) are connecting rubber bushes (3-5), which accomo- date connecting means (71, 72; 81, 82 or 91, 92), connected to the winding ends of the primary winding (7) and the secondary winding (8), for external connecting leads;
c) the active part consisting at least of wound coil former (2), transformer iron core (1) and the connecting rubber bushes (3-5) held prefixed is directly injected around with an elastic thermoplast as sole insulation sheathing;
d) the transformer iron core (1) is held by spacer webs (28) integrally formed at the inner surfaces of the rectangular coil core of the coil former (2) at a distance such that the gap may be entirely injected with the elastic thermoplast.
2. Transformer according to Claim 1 having the feature;
e) integrally formed at the base flanges (21 or 22) of the coil former are mounts (25, 26 or 27), onto which the connecting rubber bushes (3-5) are fitted.
3. Transformer according to Claim 1 and/or 2 having the feature:
f) the spacer webs (28) are integrally formed at the inner surfaces of the rectangular coil core of the coil former (2) outside the corners of the latter.
4. Transformer according to Claim 1 having the feature:
g) a push-on sleeve (72) embedded in the connecting rubber bush (4) is provided as connecting means (Fig. 4).
5. Transformer according to Claim 1 having the feature:
h) a connecting lead (9) embedded in the connecting rubber bush (5) and having a bared conductor part (92) projecting inside and an insulation- sheathed conductor part vulcanized into the connecting rubber bush is provided as connecting means (Fig. 11).
6. Transformer according to Claim 1 having the feature:
i) the connecting rubber bushes (3-5) are provided in an injection mould for the insulation sheathing as holding means for the active part consisting at least of transformer iron core (1) and coil former (2) with winding (7, 8).
EP86111589A 1985-09-03 1986-08-21 Transformer with a moulded insulative encapsulation Expired EP0217103B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86111589T ATE43454T1 (en) 1985-09-03 1986-08-21 TRANSFORMER WITH CAST INSULATION JACKET.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3531445 1985-09-03
DE3531445 1985-09-03

Publications (2)

Publication Number Publication Date
EP0217103A1 EP0217103A1 (en) 1987-04-08
EP0217103B1 true EP0217103B1 (en) 1989-05-24

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EP86111589A Expired EP0217103B1 (en) 1985-09-03 1986-08-21 Transformer with a moulded insulative encapsulation

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US (1) US4763095A (en)
EP (1) EP0217103B1 (en)
JP (1) JPS6255914A (en)
AT (1) ATE43454T1 (en)
DE (1) DE3663601D1 (en)
DK (1) DK415186A (en)
FI (1) FI862409A (en)

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Publication number Publication date
DK415186D0 (en) 1986-09-01
EP0217103A1 (en) 1987-04-08
JPS6255914A (en) 1987-03-11
DE3663601D1 (en) 1989-06-29
FI862409A (en) 1987-03-04
DK415186A (en) 1987-03-04
US4763095A (en) 1988-08-09
ATE43454T1 (en) 1989-06-15
FI862409A0 (en) 1986-06-05

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