EP1729317B1 - Helically wound fusible conductor for fuse element with plastic sealing - Google Patents
Helically wound fusible conductor for fuse element with plastic sealing Download PDFInfo
- Publication number
- EP1729317B1 EP1729317B1 EP05011930A EP05011930A EP1729317B1 EP 1729317 B1 EP1729317 B1 EP 1729317B1 EP 05011930 A EP05011930 A EP 05011930A EP 05011930 A EP05011930 A EP 05011930A EP 1729317 B1 EP1729317 B1 EP 1729317B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- plastic material
- fusible
- conductive wire
- fusible conductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 239000004033 plastic Substances 0.000 title claims description 61
- 239000004020 conductor Substances 0.000 title claims description 52
- 238000007789 sealing Methods 0.000 title description 2
- 239000000463 material Substances 0.000 claims description 50
- 238000004804 winding Methods 0.000 claims description 40
- 239000007788 liquid Substances 0.000 claims description 13
- 239000011521 glass Substances 0.000 claims description 11
- 229920001296 polysiloxane Polymers 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 5
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine powder Natural products NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 4
- 229920002050 silicone resin Polymers 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims 1
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 239000003365 glass fiber Substances 0.000 description 9
- 230000004907 flux Effects 0.000 description 7
- 239000000835 fiber Substances 0.000 description 6
- 229910000679 solder Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- NEIHULKJZQTQKJ-UHFFFAOYSA-N [Cu].[Ag] Chemical compound [Cu].[Ag] NEIHULKJZQTQKJ-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000004447 silicone coating Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/38—Means for extinguishing or suppressing arc
- H01H85/42—Means for extinguishing or suppressing arc using an arc-extinguishing gas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
- H01H85/042—General constructions or structure of high voltage fuses, i.e. above 1000 V
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/18—Casing fillings, e.g. powder
- H01H85/185—Insulating members for supporting fusible elements inside a casing, e.g. for helically wound fusible elements
Definitions
- the invention relates to a winding fuse for a fuse element with an electrically insulating or high-resistance core around which at least one fuse wire is wound. Furthermore, the invention relates to methods for producing such a winding winding conductor.
- Wickelschmelzleiter the type mentioned are used for some time in fuse components.
- a fusible conductor wire is wound around a core made of a plurality of glass fibers, wherein a predetermined winding density is to be maintained in order to achieve desired properties.
- Such a prefabricated winding fusible conductor is then cut to a predetermined length and introduced, for example, in a ceramic tube and thereby electrically connected to the electrically conductive end caps, which are placed on the tube and mechanically fastened at the same time.
- electrical and mechanical attachment of the winding fusible conductor is soldered, for example, to the end caps.
- a fuse component in which a fused by an insulating ceramic sheath fuse wire spirally around a insulating core is wrapped around.
- the insulating ceramic cladding surrounding the fuse wire limits the propagation of the metal vapor as the fuse wire is severed.
- the insulated fuse wire can be fixed on the insulating core by means of an enamel layer and additionally supported by a cladding material. It has been found that the fuse components using a winding fusible conductor have a lower switching capacity than fuse components using a conventional wire melting conductor. This is due in particular to an insufficient extinction of the arc generated during shutdown.
- the object of the invention is therefore to provide a fuse component with a winding fuse, which shows an improved turn-off.
- the winding fusible conductor for a fuse element with an electrically insulating or high-resistance core, on which at least one fuse wire is wound, wherein the core has gaps, pores or other spaces, is characterized in that a temperature-resistant plastic is applied to the core such that at least the covered between the fusible wire exposed surface areas of the core of the plastic and the interstices formed between the wound fuse wire and the surface of the core (ie columns) and at least the outer interstices of the core with the plastic substantially (ie, at least so far that no capillary caused will be filled out).
- the invention is based on the recognition that the breaking capacity is worsened by residues of the flux used in the soldering of the fusible wire, these remainders being due to the fact that the flux during soldering due to capillary action in gaps and interspaces of the Core or between the wound fuse wire and the surface of the core penetrate.
- a temperature-resistant plastic according to the invention constitutes a "seal" of the gaps and spaces which prevents penetration of the flux.
- a winding fusible conductor is produced by first impregnating a core with a non-cured liquid plastic material, wherein the surface of the core is coated with a layer of the plastic material, then the impregnated core is wrapped with the fusible conductor wire prior to curing of the plastic material and finally the Plastic material is allowed to harden, so that a temperature-resistant plastic is formed.
- the amount of uncured plastic liquid material in the core can be sized so that when wrapping the core, all gaps and gaps between the fuse wire core and inside the core are closed, but the outwardly facing surfaces of the fuse wire remain free , This has the advantage that the winding fusible conductor remains solderable without the need to first remove the plastic.
- the fuse wire is first wound on the core. Subsequently, the winding conductor is coated with a not yet cured liquid plastic material so that the plastic material can penetrate into spaces between the fuse wire and the core and in the pores, gaps or other spaces of the core. Then the plastic material hardens, so that a temperature-resistant plastic is formed.
- This alternative method offers the advantage that a conventional winding fusible conductor can be used as the starting material.
- the flux can no longer penetrate into the spaces between the fusible conductor wire and core and into the core, as a result of which Switching capacity is improved.
- the fuse wire is fixed after curing of the plastic on the core, which allows higher winding densities of, for example, over 60%.
- the core is comprised of a plurality of glass and / or ceramic fibers, with the interstices between the individual fibers also being substantially filled by the plastic.
- the cores of a plurality of parallel glass or ceramic fibers are compressed during winding, so that - in the first manufacturing process alternative - after a prior impregnation of the fibers with the plastic material, a part of the plastic material is pressed out during winding from the core and remains between the wire windings. If a relatively large excess of the liquid plastic material remains, then the excess plastic material can be subsequently removed by mechanical stripping of the winding fusible conductor.
- the plastic material used is a silicone which is applied in the liquid state and cured later.
- the cured silicone is temperature resistant.
- one or more arc-quenching materials are mixed, preferably a melamine powder. This additionally supports the arc-quenching effect of the silicone coating.
- FIG. 1 is a schematic representation of a section of a winding fusible conductor 1 according to the invention.
- a fusible conductor wire 2 is wound on an insulating or high-resistance core 3.
- the fuse wire 2 is, for example, a wire made of a tin-plated silver-copper alloy core having a circular cross section and a diameter in the range of 0.05 mm to 0.5 mm.
- the cross section need not be circular, but it can be wound, for example, a metal strip. Thinner or thicker wires are also conceivable depending on the desired properties.
- the core 3 could for example consist of a more or less flexible rod of an insulating material (eg glass, glass ceramic, plastic or ceramic) or high-resistance material (eg semiconductor or high-resistance metal conductor).
- the core is a bundle of glass and / or ceramic fibers.
- the core is glass fiber, i. H. a bundle of twisted or spun glass fibers. In the raw state, the glass fibers of the glass silk lie relatively loosely together, so that many spaces are formed. When wrapping the glass core 3 with the fuse wire 2, the glass fiber is compressed, d. H. The individual glass fibers are pressed together.
- the core 3 is soaked before wrapping with a (still) liquid silicone plastic, so that fill the spaces between the glass fibers with the plastic material.
- a (still) liquid silicone plastic so that fill the spaces between the glass fibers with the plastic material.
- the outer layers of the glass silk fill with the plastic, so that the glass silk is sealed so that no more liquids in the possibly still existing inner spaces can get.
- a part of the plastic material is pushed out of the glass fiber and remains on the core 3 and fills the gaps (gaps) between the fuse wire 2 and the core 3. Remains too much excess plastic material, it can be stripped in still liquid state of the winding fusible conductor 1.
- FIG. 1 shows the remaining plastic material 4 between the individual turns of the fusible conductor wire 2.
- the plastic hardens, wherein hardening in the sense of setting is to be understood.
- the plastic material does not need to be hard.
- the cured temperature-resistant plastic preferably remains soft or elastic, so that the winding fusible conductor 1 remains flexible.
- a silicone is preferably used, wherein the silicone material for example consists of two components, which are mixed before application.
- arc-quenching materials in particular melamine powder, are added to the silicone.
- ten parts of silicone resin are mixed with four parts of melamine powder.
- FIG 2 shows a schematic representation of a fuse element 5, in which the winding fuse 1 according to the invention is used.
- the winding fusible conductor 1 comprises a core 3 onto which the fuse wire 2 is wound and in which the spaces between the turns of the fuse wire 2 are filled with the plastic material 4.
- the applied plastic material 4 is shown for clarity only on the left half of the winding fusible conductor 1.
- the fuse 5 comprises an insulating tube 6 made of glass, plastic or ceramic, in the interior 7 of the Wikkelschmelzleiter 1 is included.
- the tube 6 may have a round or rectangular cross-section.
- the interior 7 may be filled with air, gas filled, empty or filled with another material.
- Two end caps 8 are placed on the ends of the tube 6 (eg, soldered or glued on).
- the fusible conductor 1 is soldered onto the bottoms of the end caps 8, the solder being shown schematically in FIG. 2 by the solder regions 9. But the solder joint can also be much smaller than it is shown in Figure 2 with the hatched areas 9.
- the hatched area 9 may in this case also be a sealing material which is introduced into the end caps.
- winding fusible conductor 1 is soldered onto the inner bottoms of the end caps 8, a flux is of course used in addition to the solder.
- the inventive sealing of the fusible conductor 1 by means of the plastic material 4 prevents melted or liquid parts of the flux from migrating along the winding fusible conductor due to the capillary action. Such no longer removable flux residues would form a source of carbon and, in the event of shutdown (severing) of the fusible conductor, form conductive bridges which assist in reigniting the arc in the succeeding halfwaves.
- FIG. 3 shows an alternative embodiment of a fuse component 10.
- Two contact pins 12 are led through a base 11.
- a protective cap 13 is placed on the base 11.
- the ends of the connecting pins 12 open into terminal lugs 14, to each of which one end of a winding semiconductor conductor 1 is attached.
- the winding fusible conductor 1 is attached to the terminal lugs 14, each with a solder joint 15.
- a wiper fusible conductor 1 may be used in which one or more insulating fibers are wound around the core 3 in parallel with the fuse wire 2, the adjacent turns of the Melt wire 2 thus hold at a predetermined distance from each other.
- the combination of such a development with the seal according to the invention improves the breaking capacity and the reproducibility of the properties of the winding conductor.
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- Fuses (AREA)
Description
Die Erfindung betrifft einen Wickelschmelzleiter für ein Schmelzsicherungsbauelement mit einem elektrisch isolierenden oder hochohmigen Kern, um den wenigstens ein Schmelzleiterdraht gewickelt ist. Ferner bezieht sich die Erfindung auf Verfahren zum Herstellen eines solchen Wickelschmelzleiters.The invention relates to a winding fuse for a fuse element with an electrically insulating or high-resistance core around which at least one fuse wire is wound. Furthermore, the invention relates to methods for producing such a winding winding conductor.
Wickelschmelzleiter der eingangs genannten Art werden seit längerer Zeit in Schmelzsicherungsbauelementen eingesetzt. Beispielsweise wird um einen aus mehreren Glasfasern bestehenden Kern ein Schmelzleiterdraht gewickelt, wobei eine vorgegebene Wickeldichte einzuhalten ist, um gewünschte Eigenschaften zu erzielen. Ein derartiger vorgefertigter Wickelschmelzleiter wird dann auf eine vorgegebene Länge zugeschnitten und beispielsweise in ein Keramikröhrchen eingebracht und dabei mit den elektrisch leitfähigen Endkappen, die auf das Röhrchen aufgesetzt werden, elektrisch verbunden und gleichzeitig mechanisch befestigt. Zur elektrischen und mechanischen Befestigung wird der Wickelschmelzleiter beispielsweise an die Endkappen angelötet.Wickelschmelzleiter the type mentioned are used for some time in fuse components. For example, a fusible conductor wire is wound around a core made of a plurality of glass fibers, wherein a predetermined winding density is to be maintained in order to achieve desired properties. Such a prefabricated winding fusible conductor is then cut to a predetermined length and introduced, for example, in a ceramic tube and thereby electrically connected to the electrically conductive end caps, which are placed on the tube and mechanically fastened at the same time. For electrical and mechanical attachment of the winding fusible conductor is soldered, for example, to the end caps.
In dem
In dem Patent
Aufgabe der Erfindung ist es daher, ein Sicherungsbauelement mit einem Wickelschmelzleiter zu schaffen, das ein verbessertes Abschaltverhalten zeigt.The object of the invention is therefore to provide a fuse component with a winding fuse, which shows an improved turn-off.
Diese Aufgabe wird durch einen Wickelschmelzleiter mit den Merkmalen des Anspruchs 1 bzw. ein Verfahren zum Herstellen eines solchen Wickelschmelzleiters mit den Merkmalen des Anspruchs 8 oder des Anspruchs 11 gelöst.This object is achieved by a winding fusible conductor having the features of claim 1 and a method for producing such a winding fusible conductor having the features of
Der Wickelschmelzleiter für ein Schmelzsicherungsbauelement mit einem elektrisch isolierenden oder hochohmigen Kern, auf den wenigstens ein Schmelzleiterdraht gewickelt ist, wobei der Kern Spalten, Poren oder andere Zwischenräume aufweist, ist dadurch gekennzeichnet, daß ein temperaturbeständiger Kunststoff derart auf den Kern aufgebracht ist, daß zumindest die zwischen dem Schmelzleiterdraht freiliegenden Oberflächenbereiche des Kerns von dem Kunststoff bedeckt und die zwischen dem gewickelten Schmelzleiterdraht und der Oberfläche des Kerns gebildeten Zwischenräume (das heißt Spalten) sowie zumindest die äußeren Zwischenräume des Kerns mit dem Kunststoff im wesentlichen (d.h. zumindest soweit, daß keine Kapillarwirkung hervorgerufen wird) ausgefüllt sind.The winding fusible conductor for a fuse element with an electrically insulating or high-resistance core, on which at least one fuse wire is wound, wherein the core has gaps, pores or other spaces, is characterized in that a temperature-resistant plastic is applied to the core such that at least the covered between the fusible wire exposed surface areas of the core of the plastic and the interstices formed between the wound fuse wire and the surface of the core (ie columns) and at least the outer interstices of the core with the plastic substantially (ie, at least so far that no capillary caused will be filled out).
Der Erfindung liegt die Erkenntnis zugrunde, daß das Abschaltvermögen durch Reste des beim Löten des Schmelzleiterdrahts verwendeten Flußmittels verschlechtert wird, wobei diese Reste davon herrühren, daß das Flußmittel beim Löten aufgrund der Kapillarwirkung in Spalten und Zwischenräume des Kerns bzw. zwischen dem gewickelten Schmelzleiterdraht und der Oberfläche des Kerns eindringen.The invention is based on the recognition that the breaking capacity is worsened by residues of the flux used in the soldering of the fusible wire, these remainders being due to the fact that the flux during soldering due to capillary action in gaps and interspaces of the Core or between the wound fuse wire and the surface of the core penetrate.
Die erfindungsgemäße Einbringung eines temperaturbeständigen Kunststoffs stellt eine "Versiegelung" der Spalten und Zwischenräume dar, die ein Eindringen des Flußmittels verhindert.The introduction of a temperature-resistant plastic according to the invention constitutes a "seal" of the gaps and spaces which prevents penetration of the flux.
Erfindungsgemäß wird ein Wickelschmelzleiter hergestellt, indem zunächst ein Kern mit einem nicht ausgehärteten flüssigen Kunststoffmaterial getränkt wird, wobei auch die Oberfläche des Kerns mit einer Schicht des Kunststoffmaterials überzogen wird, dann der getränkte Kern vor dem Aushärten des Kunststoffmaterials mit dem Schmelzleiterdraht umwickelt wird und schließlich das Kunststoffmaterial aushärten gelassen wird, so daß ein temperaturbeständiger Kunststoff gebildet wird. Bei diesem Herstellungsverfahren kann die Menge des noch nicht ausgehärteten flüssigen Kunststoffmaterials im Kern so dimensioniert werden, daß beim Umwickeln des Kerns sämtliche Zwischenräume und Spalten zwischen Schmelzleiterdraht und Kern und innerhalb des Kerns geschlossen werden, aber die nach au-ßen weisenden Flächen des Schmelzleiterdrahts frei bleiben. Dies hat den Vorteil, daß der Wickelschmelzleiter lötbar bleibt, ohne daß zuvor der Kunststoff entfernt zu werden braucht.According to the invention, a winding fusible conductor is produced by first impregnating a core with a non-cured liquid plastic material, wherein the surface of the core is coated with a layer of the plastic material, then the impregnated core is wrapped with the fusible conductor wire prior to curing of the plastic material and finally the Plastic material is allowed to harden, so that a temperature-resistant plastic is formed. In this manufacturing process, the amount of uncured plastic liquid material in the core can be sized so that when wrapping the core, all gaps and gaps between the fuse wire core and inside the core are closed, but the outwardly facing surfaces of the fuse wire remain free , This has the advantage that the winding fusible conductor remains solderable without the need to first remove the plastic.
Bei einem alternativen Herstellungsverfahren wird zunächst der Schmelzleiterdraht auf den Kern gewickelt. Anschließend wird der Wickelschmelzleiter mit einem noch nicht ausgehärteten flüssigen Kunststoffmaterial derart beschichtet, daß das Kunststoffmaterial in Zwischenräume zwischen dem Schmelzleiterdraht und dem Kern sowie in die Poren, Spalten oder anderen Zwischenräume des Kerns eindringen kann. Dann härtet das Kunststoffmaterial aus, so daß ein temperaturbeständiger Kunststoff gebildet wird. Diese Verfahrensalternative bietet den Vorteil, daß ein herkömmlicher Wickelschmelzleiter als Ausgangsmaterial verwendet werden kann.In an alternative manufacturing method, the fuse wire is first wound on the core. Subsequently, the winding conductor is coated with a not yet cured liquid plastic material so that the plastic material can penetrate into spaces between the fuse wire and the core and in the pores, gaps or other spaces of the core. Then the plastic material hardens, so that a temperature-resistant plastic is formed. This alternative method offers the advantage that a conventional winding fusible conductor can be used as the starting material.
Bei dem erfindungsgemäßen Wickelschmelzleiter kann das Flußmittel nicht mehr in die Zwischenräume zwischen Schmelzleiterdraht und Kern sowie in den Kern eindringen, wodurch das Schaltvermögen verbessert wird. Darüber hinaus wird der Schmelzleiterdraht nach dem Aushärten des Kunststoffs auf dem Kern fixiert, was höhere Wickeldichten von beispielsweise über 60 % ermöglicht.In the case of the winding-type fusible conductor according to the invention, the flux can no longer penetrate into the spaces between the fusible conductor wire and core and into the core, as a result of which Switching capacity is improved. In addition, the fuse wire is fixed after curing of the plastic on the core, which allows higher winding densities of, for example, over 60%.
Bei einer typischen Ausführungsform besteht der Kern aus mehreren Glas- und/oder Keramikfasern, wobei auch die Zwischenräume zwischen den einzelnen Fasern von dem Kunststoff im wesentlichen gefüllt werden. Die Kerne aus mehreren parallelen Glas- oder Keramikfasern werden beim Wickeln komprimiert, so daß - bei der ersten Herstellungsverfahrensalternative - nach einem vorherigen Tränken der Fasern mit dem Kunststoffmaterial ein Teil des Kunststoffmaterials beim Wickeln aus dem Kern herausgedrückt wird und zwischen den Drahtwicklungen verbleibt. Wenn ein relativ hoher Überschuß des flüssigen Kunststoffmaterials verbleibt, so kann das überschüssige Kunststoffmaterial anschließend durch mechanisches Abstreifen des Wickelschmelzleiters entfernt werden.In a typical embodiment, the core is comprised of a plurality of glass and / or ceramic fibers, with the interstices between the individual fibers also being substantially filled by the plastic. The cores of a plurality of parallel glass or ceramic fibers are compressed during winding, so that - in the first manufacturing process alternative - after a prior impregnation of the fibers with the plastic material, a part of the plastic material is pressed out during winding from the core and remains between the wire windings. If a relatively large excess of the liquid plastic material remains, then the excess plastic material can be subsequently removed by mechanical stripping of the winding fusible conductor.
Bei einer vorteilhaften Ausführungsform wird als Kunststoffmaterial ein Silikon verwendet, das im flüssigen Zustand aufgebracht wird und später aushärtet. Das ausgehärtete Silikon ist temperaturbeständig. Bei einer vorteilhaften Weiterbildung werden dem Silikon ein oder mehrere lichtbogenlöschende Materialien zugemischt, vorzugsweise ein Melaminpulver. Dies unterstützt zusätzlich die lichtbogenlöschende Wirkung der Silikonbeschichtung.In an advantageous embodiment, the plastic material used is a silicone which is applied in the liquid state and cured later. The cured silicone is temperature resistant. In an advantageous development of the silicone one or more arc-quenching materials are mixed, preferably a melamine powder. This additionally supports the arc-quenching effect of the silicone coating.
Vorteilhafte und/oder bevorzugte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous and / or preferred developments of the invention are characterized in the subclaims.
Im folgenden wird die Erfindung anhand von in den Zeichnungen dargestellten bevorzugten Ausführungsformen näher erläutert. In den Zeichnungen zeigen:
- Figur 1 eine schematische Darstellung eines Ausführungsbeispiels des erfindungsgemäßen Wickelschmelzleiters;
Figur 2 eine schematische Schnittdarstellung eines Schmelzsicherungsbauelements mit dem erfindungsgemäßen Wickelschmelzleiter; undFigur 3 eine schematische Schnittdarstellung einer alternativen Ausführungsform eines Schmelzsicherungsbauelements mit dem erfindungsgemäßen Wickelschmelzleiter.
- Figure 1 is a schematic representation of an embodiment of the winding fuse according to the invention;
- Figure 2 is a schematic sectional view of a fuse element with the inventive winding fuse; and
- Figure 3 is a schematic sectional view of an alternative embodiment of a fuse element with the inventive winding fuse.
Figur 1 ist eine schematische Darstellung eines Abschnitts eines erfindungsgemäßen Wickelschmelzleiters 1. Ein Schmelzleiterdraht 2 ist auf einen isolierenden oder hochohmigen Kern 3 gewickelt. Bei dem Schmelzleiterdraht 2 handelt es sich beispielsweise um einen Draht aus einem mit einer Zinnschicht versehenen Silber-Kupfer-Legierungskern mit einem kreisförmigen Querschnitt und einem Durchmesser im Bereich von 0,05 mm bis 0,5 mm. Selbstverständlich sind eine Vielzahl anderer Legierungen und Metalle denkbar. Der Querschnitt braucht auch nicht kreisförmig zu sein, sondern es kann beispielsweise ein Metallband gewickelt werden. Auch sind dünnere oder dickere Drähte in Abhängigkeit von den gewünschten Eigenschaften denkbar. Der Kern 3 könnte beispielsweise aus einem mehr oder weniger flexiblen Stab aus einem isolierenden Material (z. B. Glas, Glaskeramik, Kunststoff oder Keramik) oder hochohmigen Material (z. B. Halbleiter oder hochohmiger Metalleiter) bestehen. Bei bevorzugten Ausführungsformen besteht der Kern jedoch aus einem Bündel von Glas- und/oder Keramikfasern. Vorzugsweise besteht der Kern aus Glasseide, d. h. einem Bündel verdrillter oder versponnener Glasfasern. Im Rohzustand liegen die Glasfasern der Glasseide relativ locker aneinander, so daß viele Zwischenräume gebildet werden. Beim Umwickeln des Glasseidenkerns 3 mit dem Schmelzleiterdraht 2 wird die Glasseide komprimiert, d. h. es werden die einzelnen Glasfasern aneinandergedrückt.FIG. 1 is a schematic representation of a section of a winding fusible conductor 1 according to the invention. A
Bei der Herstellung des erfindungsgemäßen Wickelschmelzleiters 1, bei dem ein Kern aus Glasseide verwendet wird, wird der Kern 3 vor dem Umwickeln mit einem (noch) flüssigen Silikonkunststoff getränkt, so daß sich die Zwischenräume zwischen den Glasfasern mit dem Kunststoffmaterial füllen. Selbstverständlich brauchen nicht sämtliche Zwischenräume gefüllt zu werden; es genügt im Grunde, wenn sich die äußeren Schichten der Glasseide mit dem Kunststoff füllen, so daß die Glasseide derart versiegelt wird, daß keine Flüssigkeiten mehr in die ggf. noch vorhandenen inneren Zwischenräume gelangen können. Beim Umwickeln des getränkten Kerns 3 mit dem Schmelzleiterdraht 2 wird ein Teil des Kunststoffmaterials aus der Glasseide herausgedrückt und verbleibt auf dem Kern 3 und füllt die Zwischenräume (Spalten) zwischen dem Schmelzleiterdraht 2 und dem Kern 3 aus. Verbleibt zuviel überschüssiges Kunststoffmaterial, so kann dieses in noch flüssigem Zustand vom Wickelschmelzleiter 1 abgestreift werden. Es ist aber auch denkbar und bevorzugt, daß die Aufnahme des flüssigen Kunststoffmaterials in den rohen Kern 3 so dimensioniert wird, daß nach dem Wickeln kein Abstreifen mehr erforderlich ist. Figur 1 zeigt das verbliebene Kunststoffmaterial 4 zwischen den einzelnen Windungen des Schmelzleiterdrahts 2. Anschließend härtet der Kunststoff aus, wobei Aushärten im Sinne von Abbinden zu verstehen ist. Das Kunststoffmaterial braucht dabei nicht hart zu werden. Im Gegenteil, bei Verwendung von Silikon bleibt der ausgehärtete temperaturbeständige Kunststoff vorzugsweise weich bzw. elastisch, so daß der Wickelschmelzleiter 1 flexibel bleibt.In the manufacture of the inventive winding fusible conductor 1, in which a core of glass fiber is used, the
Als Kunststoffmaterial wird vorzugsweise ein Silikon verwendet, wobei das Silikonmaterial beispielsweise aus zwei Komponenten besteht, die vor dem Aufbringen gemischt werden. Vorzugsweise werden dem Silikon lichtbogenlöschende Materialien, insbesondere Melaminpulver, zugesetzt. Beispielsweise werden zehn Anteile Silikonharz mit vier Anteilen Melaminpulver gemischt.As the plastic material, a silicone is preferably used, wherein the silicone material for example consists of two components, which are mixed before application. Preferably, arc-quenching materials, in particular melamine powder, are added to the silicone. For example, ten parts of silicone resin are mixed with four parts of melamine powder.
Figur 2 zeigt eine schematische Darstellung eines Schmelzsicherungsbauelements 5, in dem der erfindungsgemäße Wickelschmelzleiter 1 eingesetzt wird. Der Wickelschmelzleiter 1 umfaßt einen Kern 3, auf den der Schmelzleiterdraht 2 aufgewikkelt und bei dem die Zwischenräume zwischen den Windungen des Schmelzleiterdrahts 2 mit dem Kunststoffmaterial 4 gefüllt sind. Bei der schematischen Darstellung in Figur 2 ist das aufgebrachte Kunststoffmaterial 4 zur Verdeutlichung nur auf der linken Hälfte des Wickelschmelzleiters 1 dargestellt. Die Schmelzsicherung 5 umfaßt ein isolierendes Röhrchen 6 aus Glas, Kunststoff oder Keramik, in dessen Innenraum 7 der Wikkelschmelzleiter 1 aufgenommen ist. Das Röhrchen 6 kann einen runden oder rechteckigen Querschnitt haben. Der Innenraum 7 kann luftgefüllt, gasgefüllt, leer oder mit einem anderen Material gefüllt sein. Auf die Enden des Röhrchens 6 sind zwei Endkappen 8 aufgesetzt (z. B. aufgelötet oder aufgeklebt). Der Schmelzleiter 1 ist auf die Böden der Endkappen 8 aufgelötet, wobei das Lot in Figur 2 schematisch durch die Lotbereiche 9 dargestellt ist. Die Lötstelle kann aber auch deutlich kleiner ausfallen, als es in Figur 2 mit den schraffierten Bereichen 9 dargestellt ist. Der schraffierte Bereich 9 kann in diesem Fall auch ein Dichtungsmaterial, welches in die Endkappen eingebracht ist, darstellen.Figure 2 shows a schematic representation of a fuse element 5, in which the winding fuse 1 according to the invention is used. The winding fusible conductor 1 comprises a
Wird der Wickelschmelzleiter 1 auf die Innenböden der Endkappen 8 aufgelötet, so wird neben dem Lot selbstverständlich auch ein Flußmittel verwendet. Die erfindungsgemäße Versiegelung des Schmelzleiters 1 mittels des Kunststoffmaterials 4 verhindert, daß geschmolzene bzw. flüssige Teile des Flußmittels aufgrund der Kapillarwirkung den Wickelschmelzleiter entlang wandern. Solche nicht mehr entfernbaren Flußmittelreste würden eine Kohlenstoffquelle bilden und im Falle des Abschaltens (Durchtrennens) des Schmelzleiters leitfähige Brücken bilden, welche ein Neuzünden des Lichtbogens in den Folge-Halbwellen unterstützen.If the winding fusible conductor 1 is soldered onto the inner bottoms of the
Figur 3 zeigt eine alternative Ausführungsform eines Sicherungsbauelements 10. Durch einen Sockel 11 sind zwei Kontaktstifte 12 hindurchgeführt. Auf den Sockel 11 ist eine Schutzkappe 13 aufgesetzt. Im Innenraum zwischen Sockel 11 und Schutzkappe 13 münden die Enden der Anschlußstifte 12 in Anschlußfahnen 14, an denen jeweils ein Ende eines Wickelschmelzleiters 1 befestigt ist. Der Wickelschmelzleiter 1 ist an den Anschlußfahnen 14 mit jeweils einer Lötverbindung 15 befestigt.FIG. 3 shows an alternative embodiment of a
Im Rahmen des Erfindungsgedankens sind zahlreiche alternative Ausführungsformen denkbar. Beispielsweise kann ein Wikkelschmelzleiter 1 verwendet werden, bei dem um den Kern 3 parallel zu dem Schmelzleiterdraht 2 eine oder mehrere isolierende Fasern gewickelt sind, die benachbarte Windungen des Schmelzleiterdrahts 2 somit in einem vorgegebenen Abstand zueinander halten. Die Kombination einer derartigen Weiterbildung mit der erfindungsgemäßen Versiegelung verbessert das Abschaltvermögen und die Reproduzierbarkeit der Eigenschaften des Wickelschmelzleiters.Numerous alternative embodiments are conceivable within the scope of the inventive concept. For example, a wiper fusible conductor 1 may be used in which one or more insulating fibers are wound around the
Claims (13)
- A helically wound fusible conductor for a fuse component (5), including:an electrically insulating or high resistance core (3), onto which at least one fusible conductive wire (2) is wound, the core (3) including gaps, pores or other voids,wherein a temperature-resistant plastic material (4) is applied to the core (3) such that at least the surface regions of the core disposed between the fusible conductive wire are covered by the plastic material and the gaps defined between the wound fusible conductive wire (2) and the surface of the core (3) and at least the outer voids in the core (3) are substantially filled with the plastic material.
- A helical wound fusible conductor as claimed in Claim 1, characterised in that the core (3) consists of a plurality of glass and/or ceramic fibres and the gaps between the glass and/or ceramic fibres are also substantially filled by the plastic material (4).
- A helically wound fusible conductor as claimed in Claim 1 or 2, characterised in that the plastic material (4) envelopes the helically wound fusible conductor (1) such that the outer surfaces of the fusible conductive wire (2) are also covered with the plastic material.
- A helically wound fusible conductor as claimed in one of Claims 1 to 3, characterised in that one or more insulating fibres are wound around the core parallel to the fusible conductive wire, which maintain the adjacent windings of the fusible conductive wire at a predetermined spacing from one another.
- A helically wound fusible conductor as claimed in one of Claims 1 to 4, characterised in that the plastic material is a silicone.
- A helically wound fusible conductor as claimed in Claim 5, characterised in that one or more arc-extinguishing materials are mixed into the silicone.
- A helically wound fusible conductor as claimed in Claim 6, characterised in that melamine powder is mixed into the silicone.
- A method of manufacturing a helically wound fusible conductor in which a fusible conductive wire is wound around an insulating or high resistance core, wherein:a) the core is impregnated with an unset, liquid plastic material, whereby the surface of the core is also coated with a layer of the plastic material,b) the fusible conductive wire is wound around the impregnated core before the setting of the plastic material, andc) the plastic material is permitted to set so that a temperature-resistant plastic material is formed.
- A method as claimed in Claim 8, characterised in that the core is impregnated with an amount of the liquid plastic material, which, with a compression of the core accompanying the winding around of the fusible conductive wire, results in excess plastic material being squeezed out.
- A method as claimed in Claim 9, characterised in that after the winding of the fusible conductive wire, excess plastic material is removed by wiping.
- A method of manufacturing a helically wound fusible conductor, in which a fusible conductive wire is wound around an insulating or high-resistance coil, wherein the core includes gaps, pores or other voids, whereina) the fusible conductive wire is wound onto the coreb) the helically wound fusible conductor is then coated with an as yet unset liquid plastic material such that the plastic material can penetrate into gaps between the fusible conductive wire and the core and into the pores, gaps or other voids in the core, andc) the plastic material is permitted to set so that a temperature-resistant plastic material is formed.
- A method as claimed in Claim 11, characterised in that after the coating process, excess plastic material is wiped off from the helically wound fusible conductor.
- A method as claimed in one of Claims 8 to 12, characterised in that a settable silicone resin is used as the liquid plastic material.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE502005001781T DE502005001781D1 (en) | 2005-06-02 | 2005-06-02 | Coiled melting conductor for a fuse element with plastic seal |
EP05011930A EP1729317B1 (en) | 2005-06-02 | 2005-06-02 | Helically wound fusible conductor for fuse element with plastic sealing |
CNA2006100930129A CN1873875A (en) | 2005-06-02 | 2006-06-02 | Helically wound fusible conductor for fuse element with plastic sealing |
US11/421,978 US20070132539A1 (en) | 2005-06-02 | 2006-06-02 | Fusible spiral conductor for a fuse component with a plastic seal |
JP2006154828A JP4733570B2 (en) | 2005-06-02 | 2006-06-02 | Soluble helical conductor for fuse elements with plastic seals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05011930A EP1729317B1 (en) | 2005-06-02 | 2005-06-02 | Helically wound fusible conductor for fuse element with plastic sealing |
Publications (2)
Publication Number | Publication Date |
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EP1729317A1 EP1729317A1 (en) | 2006-12-06 |
EP1729317B1 true EP1729317B1 (en) | 2007-10-24 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05011930A Ceased EP1729317B1 (en) | 2005-06-02 | 2005-06-02 | Helically wound fusible conductor for fuse element with plastic sealing |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070132539A1 (en) |
EP (1) | EP1729317B1 (en) |
JP (1) | JP4733570B2 (en) |
CN (1) | CN1873875A (en) |
DE (1) | DE502005001781D1 (en) |
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US6191678B1 (en) * | 1997-09-24 | 2001-02-20 | Cooper Industries, Inc. | Time lag fuse |
JP3719475B2 (en) * | 1998-01-20 | 2005-11-24 | 矢崎総業株式会社 | High current fuse |
US6577222B1 (en) * | 1999-04-02 | 2003-06-10 | Littelfuse, Inc. | Fuse having improved fuse housing |
US6507265B1 (en) * | 1999-04-29 | 2003-01-14 | Cooper Technologies Company | Fuse with fuse link coating |
US6552646B1 (en) * | 2000-04-10 | 2003-04-22 | Bel-Fuse, Inc. | Capless fuse |
EP1364381B1 (en) * | 2001-03-02 | 2006-08-23 | Wickmann-Werke GmbH | Fuse component |
-
2005
- 2005-06-02 DE DE502005001781T patent/DE502005001781D1/en not_active Expired - Fee Related
- 2005-06-02 EP EP05011930A patent/EP1729317B1/en not_active Ceased
-
2006
- 2006-06-02 JP JP2006154828A patent/JP4733570B2/en active Active
- 2006-06-02 CN CNA2006100930129A patent/CN1873875A/en active Pending
- 2006-06-02 US US11/421,978 patent/US20070132539A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB227928A (en) * | 1923-10-26 | 1925-01-26 | Reyrolle A & Co Ltd | Improvements in or relating to electric fuses |
Also Published As
Publication number | Publication date |
---|---|
US20070132539A1 (en) | 2007-06-14 |
JP4733570B2 (en) | 2011-07-27 |
DE502005001781D1 (en) | 2007-12-06 |
JP2006339161A (en) | 2006-12-14 |
CN1873875A (en) | 2006-12-06 |
EP1729317A1 (en) | 2006-12-06 |
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