DE2844973A1 - High rupturing capacity fuse - with quenching sand enclosed in sleeve of specified thermoplastic resin - Google Patents

High rupturing capacity fuse - with quenching sand enclosed in sleeve of specified thermoplastic resin

Info

Publication number
DE2844973A1
DE2844973A1 DE19782844973 DE2844973A DE2844973A1 DE 2844973 A1 DE2844973 A1 DE 2844973A1 DE 19782844973 DE19782844973 DE 19782844973 DE 2844973 A DE2844973 A DE 2844973A DE 2844973 A1 DE2844973 A1 DE 2844973A1
Authority
DE
Germany
Prior art keywords
fuse
inner shell
fuse according
sleeve
thermoplastic
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.)
Withdrawn
Application number
DE19782844973
Other languages
German (de)
Inventor
Joerg Grote
Fritz Hollmann
Werner Zinser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fritz Driescher KG Spezialfabrik fur Elektrizitae
Original Assignee
DRIESCHER SPEZIALFAB FRITZ
FRITZ DRIESCHER SPEZIALFABRIK fur ELEKTRIZITAETSWERKSBEDARF
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by DRIESCHER SPEZIALFAB FRITZ, FRITZ DRIESCHER SPEZIALFABRIK fur ELEKTRIZITAETSWERKSBEDARF filed Critical DRIESCHER SPEZIALFAB FRITZ
Priority to DE19782844973 priority Critical patent/DE2844973A1/en
Publication of DE2844973A1 publication Critical patent/DE2844973A1/en
Withdrawn legal-status Critical Current

Links

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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/165—Casings

Landscapes

  • Fuses (AREA)

Abstract

An HRC-fuse consists of two fuse wires, embedded in a filling of spark quenching sand. The sand is contained in a totally enclosed sleeve of thermoplastic material which has an electrical conductivity of zero in the liq. state. The whole, including part of the contact blades at both ends, is enclosed in an encapsulation of a thermosetting plastic. Suitable materials for the thermoplastic inner sleeve are polyolefins such as polyethylene or polypropylene, acetal resin, PMMA, or ABS copolymer. An ultrasonic welding of the two half-cups from which the fuse is assembled is facilitated if the thermoplastic resin is reinforced by asbestos powder, glass fibre, glass beads, quartz powder or other fillers. Such a fuse operates free from trouble after interruptions of heavy overloads by an HRC fuse. It can be produced in mass prod. at low cost.

Description

NH-Sicherung NH fuse

================ Die Erfindung betrifft eine NH-Sicherung mit einer die Löschsandfüllung, in der mindestens ein Schmelzleiter eingebettet ist, umschließenden, aus thermoplastischem Kunststoff bestehenden Innenhülle, die von einer aus duroplastischem Kunststoff, insbesondere Gießharz bestehenden Außenhülle dicht und fest umschlossen ist. ================ The invention relates to an NH fuse with a enclose the quenching sand filling in which at least one fusible link is embedded, made of thermoplastic material, the inner shell of a thermosetting plastic Plastic, in particular cast resin, the existing outer shell is tightly and firmly enclosed is.

Es ist bekannt, die Innenhülle der vorstehend beschriebenen Sicherung aus thermoplastischem Kunststoff zu fertigen (DT-GM 7619 023).It is known the inner shell of the fuse described above made of thermoplastic material (DT-GM 7619 023).

Die Innenhülle bildet die innere Formbegrenzung für die Außenhülle der Sicherung und wird hergestellt durch Aneinanderfügen zweier halbkugelförmiger Schalen.The inner shell forms the inner shape limit for the outer shell the fuse and is made by joining two hemispherical Peel.

Umfangreiche Untersuchungen ergaben, daß nicht alle Thermoplaste zur Herstellung der Innenhülle verwendbar sind. Es wurde festgestellt, daß einige Thermoplaste bei hohen Temperaturen, wie sie z.B.Extensive studies have shown that not all thermoplastics are used Manufacture of the inner shell can be used. It was found that some thermoplastics at high temperatures, e.g.

bei Überlastschaltungen in Sicherungspatronen entstehen, insbesondere in ihrer elektrischen Festigkeit unterschiedlich reagieren und unter Umständen zu einer elektrisch leitenden Brückenbildung in einer bereits unterbrochenen Sicherungspatrone neigen Einen anderen Weg gehen die DT-AS 1438 o53 und die DT-OS 1463 530.arise in the case of overload circuits in fuse cartridges, in particular React differently in their electrical strength and under certain circumstances to an electrically conductive bridge formation in an already interrupted fuse cartridge The DT-AS 1438 o53 and the DT-OS 1463 530 go a different way.

Dort sollen hochwärmefeste bzw. formbeständige, also duroplastische Runststoffe oder sogar keramische Werkstoffe, Glas oder Asbest zur Herstellung der Innenhülle verwendet werden. Alle diese Materialien führen jedoch nicht zum Erfolg und sind darüber hinaus für eine kostengünstige Massenfertigung nicht geeignet.There should be highly heat-resistant or dimensionally stable, i.e. thermosetting Plastics or even ceramic materials, glass or asbestos for the manufacture of the Inner shell can be used. However, all of these materials do not lead to success and, moreover, are not suitable for inexpensive mass production.

Der vorliegenden Erfindung lag die Aufgabe zugrunde, einen thermoplastischen Kunststoff als Material für die Herstellung der Sicherungsinnenhülle anzugeben, der geeignet ist, den nach Uberlastabschaltungen von NH-Sicherungen auftretenden elektrischen Beanspruchungen zu genügen.The present invention was based on the object of a thermoplastic Specify plastic as the material for the manufacture of the inner fuse cover, which is suitable for those occurring after overload shutdowns of NH fuses to meet electrical loads.

Diese Aufgabe wurde bei einer NH-Sicherung der eingangs genannten Art dadurch gelöst, daß die Innenhülle aus einem solchen thermoplastischen Kunststoff besteht, dessen elektrische Leitfähigkeit im flüssigen Zustand nahe null ist.In the case of an NH fuse, this task became the one mentioned at the beginning Kind of solved in that the inner shell is made of such a thermoplastic material exists whose electrical conductivity in the liquid state is close to zero.

Der Erfindung lag die Erkenntnis zugrunde, daß die im festen Zustand außerordentlich guten Isoliereigenschaften einiger Thermoplaste im flüssigen Zustand nachlassen. Durch umfangreiche Untersuchungen wurde gefunden, daß Thermoplaste wie ABS-Polymerisat, Acrylharz (Plexiglas), Acetalharz oder Kunststoffe der Polyolefingruppe, insbesondere Polyäthylen oder Polypropylen ihre hohe elektrische Festigkeit sowohl im festen als auch im flüssigen Zustand beibehalten.The invention was based on the knowledge that in the solid state some thermoplastics have extremely good insulating properties in their liquid state ease up. Extensive research has found that thermoplastics such as ABS polymer, acrylic resin (Plexiglas), acetal resin or plastics of the polyolefin group, especially polyethylene or polypropylene both have their high electrical strength maintained in the solid as well as in the liquid state.

Der mit der Erfindung erzielbare Vorteil besteht darin, daß die aus dem genannten Material gefertigte Sicherungsinnenhülle ein störungsfreies Verhalten der damit ausgestatteten NH-Sicherung nach überlastschaltungen bewirkt.The advantage achievable with the invention is that the The inner fuse cover made of the material mentioned ensures trouble-free behavior the NH fuse equipped with it after overload circuits.

Das in der beigefügten Zeichnung in Fig. 1 dargestellte Ausführungsbeispiel zeigt eine NH-Sicherung, die im wesentlichen aus einer Gießharzaußenhiille 1, einer Innenhülle 2 gemäß der Erfindung und zwei durch Schmelzleiter 3, 4 verbundene Kontaktmesser 5, 6 besteht.The embodiment shown in the accompanying drawing in FIG shows an NH fuse, which consists essentially of a cast resin outer shell 1, a Inner sheath 2 according to the invention and two contact blades connected by fusible conductors 3, 4 5, 6 consists.

Das Volumen der Innenhülle 2 ist mit iibschsand 7 gefüllt. Die Grifflaschen 8, 9 sind in der Gießharzaußenhülle zugfest eingebettet.The volume of the inner shell 2 is filled with ibschsand 7. The grip tabs 8, 9 are embedded in the cast resin outer shell in a tensile manner.

Die Anzeigeeinrichtung zum Erfassen des Betriebszustandes der Sicherung ist nicht eingezeichnet.The display device for recording the operating status of the fuse is not shown.

Es empfiehlt sich, den Werkstoff zur Herstellung der aus zusammengesetzten Halbschalen bestehenden Innenhülle 2 durch Asbestmehl, Glasfaser, Glas kugeln, Quarzmehl oder dgl. wüllmittel zu verstärken, damit eine Ultraschallverschweißung der Halbschalen möglich ist.It is recommended that the material used to manufacture the composite Half-shells existing inner shell 2 by asbestos powder, glass fiber, glass balls, quartz powder or the like. To reinforce flushing agent, so that an ultrasonic welding of the half-shells is possible.

Claims (8)

Patentansprüche 4)NH-Sicherung mit einer die Löschsandfüllung, in der mindestens ein Schmelzleiter einaebettet ist, umschließenden, aus thermoplastischem Kunststoff bestehenden Innenhülle, die von einer aus duroplastischem Kunststoff, insbesondere Gießharz bestehenden Außenhülle dicht und fest umschlossen ist, dadurch gekennzeichnet, daß die Innenhülle (2) aus einem solchen thermoplastischen Kunststoff besteht, dessen elektrische Leitfähigkeit im flüssigen Zustand nahezu null ist. Claims 4) NH fuse with the extinguishing sand filling, in the at least one fusible link is embedded, enclosing, made of thermoplastic Plastic inner shell, which is made of a thermosetting plastic, in particular cast resin existing outer shell is tightly and firmly enclosed, thereby characterized in that the inner shell (2) made of such a thermoplastic material exists, whose electrical conductivity in the liquid state is almost zero. 2. Sicherung nach Anspruch 1, dadurch gekennzeichnet, daß die Innenhülle (2) aus einem Polyolefin besteht.2. Fuse according to claim 1, characterized in that the inner shell (2) is made of a polyolefin. 3. Sicherung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Innenhülle (2) aus Polyäthylen besteht.3. Fuse according to claim 1 or 2, characterized in that the Inner shell (2) is made of polyethylene. 4. Sicherung nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, daß die Innenhülle (2) aus Polypropylen besten.4. Fuse according to one of claims 1 - 3, characterized in that that the inner shell (2) made of polypropylene is best. 5. Sicherung nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, daß die Innenhülle (2) aus Acetalharz besteht.5. Fuse according to one of claims 1 - 4, characterized in that that the inner shell (2) consists of acetal resin. 6. Sicherung nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, daß die Innenhülle (2) aus Polymethylmethacrylat besteht.6. Fuse according to one of claims 1 - 5, characterized in that that the inner shell (2) consists of polymethyl methacrylate. 7. Sicherunt nach einem der Ansprüche 1 - 6, dadurch gekennzeichnet, daß die Innenhülle (2) aus Acrylnitril-Butadien-Styrol-(ABS) Polymerisat besteht.7. Safety according to one of claims 1 - 6, characterized in that that the inner shell (2) consists of acrylonitrile-butadiene-styrene (ABS) polymer. 8. Sicherung nach einem der Ansprüche 1 - 7, dadurch gekennzeichnet, daß der Werkstoff zur Herstellung der Innenhülle (2) durch Asbestmehl, Glasfaser, Glaskugeln, Quarzmehl oder dgl. Füllmittel verstärkt ist.8. Fuse according to one of claims 1 - 7, characterized in that that the material for the production of the inner shell (2) by asbestos powder, glass fiber, Glass balls, quartz powder or the like. Filler is reinforced.
DE19782844973 1978-10-16 1978-10-16 High rupturing capacity fuse - with quenching sand enclosed in sleeve of specified thermoplastic resin Withdrawn DE2844973A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19782844973 DE2844973A1 (en) 1978-10-16 1978-10-16 High rupturing capacity fuse - with quenching sand enclosed in sleeve of specified thermoplastic resin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782844973 DE2844973A1 (en) 1978-10-16 1978-10-16 High rupturing capacity fuse - with quenching sand enclosed in sleeve of specified thermoplastic resin

Publications (1)

Publication Number Publication Date
DE2844973A1 true DE2844973A1 (en) 1980-04-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19782844973 Withdrawn DE2844973A1 (en) 1978-10-16 1978-10-16 High rupturing capacity fuse - with quenching sand enclosed in sleeve of specified thermoplastic resin

Country Status (1)

Country Link
DE (1) DE2844973A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621621A2 (en) * 1993-04-23 1994-10-26 Gould Electronics Inc. Current limiting fuses
EP0621620A2 (en) * 1993-04-23 1994-10-26 Gould Electronics Inc. Current limiting fuses
DE4416093A1 (en) * 1993-04-30 1994-11-03 Koa K K Overcurrent protection device and process for its production
US5906044A (en) * 1995-12-06 1999-05-25 Harness System Technologies Research, Ltd. Ultrasonic welding method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1463530A1 (en) * 1963-06-29 1969-03-06 Siemens Ag Process for the production of fuses, in particular NH fuses, with synthetic resin sheathing
DE1438053B2 (en) * 1962-07-18 1972-01-05 Jean Muller oHG Elektrotechnische Fabrik, 6228 Eltville LOW VOLTAGE HIGH PERFORMANCE FUSE WITH A PLASTIC SHELL SURROUNDING THE FUSIBLE CONDUCTOR AND THE EMBEDDING MATERIAL AS A FUSE HOUSING AND A PROCESS FOR MANUFACTURING THESE FUSES
DE7619023U1 (en) * 1976-06-16 1976-10-14 Fritz Driescher Spezialfabrik Fuer Elektrizitaetswerksbedarf, 5144 Wegberg Double-sheathed NH fuse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1438053B2 (en) * 1962-07-18 1972-01-05 Jean Muller oHG Elektrotechnische Fabrik, 6228 Eltville LOW VOLTAGE HIGH PERFORMANCE FUSE WITH A PLASTIC SHELL SURROUNDING THE FUSIBLE CONDUCTOR AND THE EMBEDDING MATERIAL AS A FUSE HOUSING AND A PROCESS FOR MANUFACTURING THESE FUSES
DE1463530A1 (en) * 1963-06-29 1969-03-06 Siemens Ag Process for the production of fuses, in particular NH fuses, with synthetic resin sheathing
DE7619023U1 (en) * 1976-06-16 1976-10-14 Fritz Driescher Spezialfabrik Fuer Elektrizitaetswerksbedarf, 5144 Wegberg Double-sheathed NH fuse

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DE-B.: Chemische Technologie, Bd.5, Carl Hanser Verlag München 1972 S.105-108 *
DE-B.: Kunststoff-Handbuch, Bd.4, Polyelefine, Carl Hanser Verlag München 1969 S.347-348, 252-254 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621621A2 (en) * 1993-04-23 1994-10-26 Gould Electronics Inc. Current limiting fuses
EP0621620A2 (en) * 1993-04-23 1994-10-26 Gould Electronics Inc. Current limiting fuses
EP0621620A3 (en) * 1993-04-23 1995-02-22 Gould Electronics Inc Current limiting fuses.
EP0621621A3 (en) * 1993-04-23 1995-11-08 Gould Electronics Inc Current limiting fuses.
DE4416093A1 (en) * 1993-04-30 1994-11-03 Koa K K Overcurrent protection device and process for its production
DE4416093C2 (en) * 1993-04-30 1999-08-26 Koa K K Overcurrent protection device
US5906044A (en) * 1995-12-06 1999-05-25 Harness System Technologies Research, Ltd. Ultrasonic welding method

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Legal Events

Date Code Title Description
8127 New person/name/address of the applicant

Owner name: FRITZ DRIESCHER KG SPEZIALFABRIK FUER ELEKTRIZITAE

8110 Request for examination paragraph 44
8130 Withdrawal