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EP0157934B1 - Mounting device for arc chambers - Google Patents

Mounting device for arc chambers Download PDF

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Publication number
EP0157934B1
EP0157934B1 EP84115388A EP84115388A EP0157934B1 EP 0157934 B1 EP0157934 B1 EP 0157934B1 EP 84115388 A EP84115388 A EP 84115388A EP 84115388 A EP84115388 A EP 84115388A EP 0157934 B1 EP0157934 B1 EP 0157934B1
Authority
EP
European Patent Office
Prior art keywords
rubber
arrangement according
bushing
quick
spring
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.)
Expired
Application number
EP84115388A
Other languages
German (de)
French (fr)
Other versions
EP0157934A1 (en
Inventor
Günther Dipl.-Ing. Eckert
Franz Singer
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT84115388T priority Critical patent/ATE33082T1/en
Publication of EP0157934A1 publication Critical patent/EP0157934A1/en
Application granted granted Critical
Publication of EP0157934B1 publication Critical patent/EP0157934B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/345—Mounting of arc chutes

Definitions

  • the invention relates to a fastening arrangement for arcing chambers on lower parts of switching devices by means of spring-elastic tendons.
  • the arc chambers are pressed onto the lower part via springs.
  • a spiral spring is guided over a quick-release hook.
  • a leaf spring is used for pressing.
  • the springs provided here can compensate for tolerances in the manufacture of the arc chambers in order to avoid damage to the arc chambers when they are fastened, but they cannot be used, at least not reliably, to allow the arc chamber to breathe, i.e. have the arc chamber lifted off the lower part for a short time if high overpressures occur.
  • the spring were made weak, the spring would be compressed to a block dimension at high overpressure, so that the impact exerted on the arc chamber can damage the arc chamber. If the spring is made too hard, the actuating force for locking the arc chamber becomes too great and no relief is to be expected with slight overpressures.
  • the invention is intended to provide an arrangement of the type mentioned above, in which it is possible to reduce overpressures in arcing chambers by means of switching gases without fear of destruction of the arcing chamber or of the fastening arrangement.
  • This object is achieved in a simple manner in that the spring pressure specimen elastic tendon consists of two series-connected resilient members of different spring characteristics, which are dimensioned such that only the member with the weaker spring characteristic can go to block size with a corresponding overpressure. It has proven to be advantageous if one spring element is a spiral compression spring and the other is a rubber element.
  • the rubber element is a rubber bushing guided around a fastening bolt, the outer dimension of which is smaller than the dimension of the recess in the arcing chamber holding it, the deformation of the rubber when the arcing chamber is lifted off, causing the rubber to bear against the inner wall of the recess, so that in addition friction damping when moving the fastening bolt in the rubber bushing is achieved, since the rubber bushing reduces its inner diameter when pressed together.
  • a simple design results if the series connection of the spiral compression spring and rubber bushing is guided on the fastening bolt.
  • the rubber bush only needs to be threaded onto the quick-release hook according to the known utility model.
  • the bushing can be made from EPDM (ethylene propylene diene rubber) or siloprene (silicone rubber). However, silicone rubber has proven to be particularly advantageous. If the bushing is shaped like a barrel on the outside, the desired spring and damping characteristics of the rubber bushing can easily be predetermined.
  • the switching device shown in the drawing consists of the lower part 1 and the arc chamber 2 placed thereon.
  • the quick release hook 5 is bolt-shaped and has a screw head 6;
  • a spiral compression spring 8 is threaded onto the shaft 7.
  • a rubber bushing 10 adjoins this with the interposition of a washer 9.
  • the rubber bushing 10 rests on the lower boundary 11 of the cylindrical recess 3.
  • the spiral compression spring 8 is supported at the lower end of the head 6.
  • the cylindrical bolt with head 6 is by inserting a pin 12 to the quick-release hook 5.
  • the groove guide for the pin 12 in the lower part 1 and possibly also in the arc chamber are not shown in detail.
  • the extension 13 of the recess 14 in the lower part 1 serves to lock the quick-release hook 5 in the tensioned state, i.e. by inserting a screwdriver into the slot 15 of the screw head 6 and exerting pressure in the direction of the longitudinal axis of the quick-release hook, i.e. in the tensioning direction of the springs, the bolt end comes to rest on the bottom of the recess 14 and by turning 90 °, the pin 12 comes into engagement with the extension 13, so that the arc chamber is held firmly on the lower part.
  • the invention thus creates an arrangement that is simple Dimensioning of the rubber bushing and by selection of the appropriate material in cooperation with the spiral compression spring 8 prevents damage to the arc chambers when excess pressures occur within the chambers, without having to make a considerable effort.

Landscapes

  • Chutes (AREA)
  • Breakers (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Vibration Prevention Devices (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Arc Welding In General (AREA)
  • Discharge Heating (AREA)
  • Springs (AREA)
  • Insulators (AREA)

Abstract

The invention concerns a mounting arrangement for an arc-quenching chute cover upon a base of a switching device. For that purpose it includes resilient clamping elements, such as a quick-release fastener which guides a coil spring and a rubber bushing. The anchoring of the quick-release fastener in the base is achieved by twisting a pin into a widened region. When excess pressures arise inside the arc-quenching chute cover, the rubber bushing is compressed and has a damping effect on the shaft portion of the quick-release fastener passing through it.

Description

Die Erfindung bezieht sich auf eine Befestigungsanordnung für Lichtbogenkammern auf Unterteilen von Schaltgeräten mittels federelastischer Spannglieder.The invention relates to a fastening arrangement for arcing chambers on lower parts of switching devices by means of spring-elastic tendons.

Bei bekannten anordnungen der obengenannten Art (DE-U-75 22 823, DE-B-1 077 296) sind die Lichtbogenkammern über Federn auf das Unterteil gedrückt. Im ersteren Fall ist über jeweils einen Schnellverschlußhaken eine Spiralfeder geführt. Im zweiten Fall findet eine Blattfeder zum Andrücken Verwendung. Die hier vorgesehenen Federn können zwar Toleranzen in der Fertigung der Lichtbogenkammern ausgleichen, um Beschädigungen der Lichtbogenkammern bei Befestigung zu vermeiden, sie sind jedoch nicht, zumindest nichtzuverlässig, verwendbar, um die Lichtbogenkammer atmen zu lassen, d.h. bei Entstehen hoher Überdrücke die Lichtbogenkammer kurzzeitig vom Unterteil abheben zu lassen. Würde die Feder schwach ausgebildet, so würde bei großem Überdruck die Feder auf Blockmaß zusammengedrückt, so daß der auf die Lichtbogenkammer ausgeübte Schlag eine Beschädigung der Lichtbogenkammer hervorrufen kann. Wird die Feder zu hart ausgeführt, so wird die Betätigungskraft für das Verriegeln der Lichtbogenkammer zu groß und es sind bei geringfügigen Überdrücken keine Entlastungen zu erwarten.In known arrangements of the type mentioned above (DE-U-75 22 823, DE-B-1 077 296) the arc chambers are pressed onto the lower part via springs. In the former case, a spiral spring is guided over a quick-release hook. In the second case, a leaf spring is used for pressing. The springs provided here can compensate for tolerances in the manufacture of the arc chambers in order to avoid damage to the arc chambers when they are fastened, but they cannot be used, at least not reliably, to allow the arc chamber to breathe, i.e. have the arc chamber lifted off the lower part for a short time if high overpressures occur. If the spring were made weak, the spring would be compressed to a block dimension at high overpressure, so that the impact exerted on the arc chamber can damage the arc chamber. If the spring is made too hard, the actuating force for locking the arc chamber becomes too great and no relief is to be expected with slight overpressures.

Durch die Erfindung soll eine Anordnung der obengenannten Art geschaffen werden, bei der es möglich ist, Überdrücke in Lichtbogenkammern durch Schaltgase abzubauen, ohne hierbei Zerstörungen der Lichtbogenkammer bzw. der Befestigungsanordnung befürchten zu müssen. Diese Aufgabe wird auf einfache Weise dadurch gelöst, daß das feder Druckexemplar elastische Spannglied aus zwei hintereinandergeschalteten federnden Gliedern unterschiedlicher Federcharakteristik besteht, die derart bemessen sind, daß nur das Glied mit der schwächeren Federcharakteristik bei entsprechendem Überdruck auf Blockmaß gehen kann. Als vorteilhaft hat sich herausgestellt, wenn das eine Federglied eine Spiraldruckfeder und das andere ein Gummielement ist. Ist das Gummielement eine um einen Befestigungsbolzen geführte Gummibuchse, deren Außenabmessung kleiner als die Abmessung der sie haltenden Ausnehmung in der Lichtbogenkammer ist, wobei die Verformung des Gummis beim Abheben der Lichtbogenkammer eine Anlage des Gummis an der Innenwandung der Ausnehmung zur Folge hat, so wird zusätzlich eine Reibungsdämpfung beim Bewegen des Befestigungsbolzens in der Gummibuchse erreicht, da die Gummibuchse beim Zusammenpressen ihren Innendurchmesser verkleinert. Eine einfache Ausführung ergibt sich, wenn auf dem Befestigungsbolzen die Reihenschaltung von Spiraldruckfeder und Gummibuchse geführt ist. Hier braucht lediglich auf den Schnellverschlußhaken gemäß dem bekannten Gebrauchsmuster zusätzlich die Gummibuchse aufgefädelt zu werden. Die Buchse kann aus EPDM (Ethylen-Propylen-DienKautschuk) oder Silopren (Silikon-Kautschuk) hergestellt werden. Als besonders vorteilhaft hat sich jedoch Silikongummi herausgestellt. Wird die Buchse außen tonnenförmig geformt, so läßt sich die gewünschte Feder- und Dämpfungscharakteristik der Gummibuchse auf einfache Weise vorherbestimmen.The invention is intended to provide an arrangement of the type mentioned above, in which it is possible to reduce overpressures in arcing chambers by means of switching gases without fear of destruction of the arcing chamber or of the fastening arrangement. This object is achieved in a simple manner in that the spring pressure specimen elastic tendon consists of two series-connected resilient members of different spring characteristics, which are dimensioned such that only the member with the weaker spring characteristic can go to block size with a corresponding overpressure. It has proven to be advantageous if one spring element is a spiral compression spring and the other is a rubber element. If the rubber element is a rubber bushing guided around a fastening bolt, the outer dimension of which is smaller than the dimension of the recess in the arcing chamber holding it, the deformation of the rubber when the arcing chamber is lifted off, causing the rubber to bear against the inner wall of the recess, so that in addition friction damping when moving the fastening bolt in the rubber bushing is achieved, since the rubber bushing reduces its inner diameter when pressed together. A simple design results if the series connection of the spiral compression spring and rubber bushing is guided on the fastening bolt. Here, the rubber bush only needs to be threaded onto the quick-release hook according to the known utility model. The bushing can be made from EPDM (ethylene propylene diene rubber) or siloprene (silicone rubber). However, silicone rubber has proven to be particularly advantageous. If the bushing is shaped like a barrel on the outside, the desired spring and damping characteristics of the rubber bushing can easily be predetermined.

Anhand der Zeichnung wird ein Ausführungsbeispiel gemäß der Erfindung beschrieben.An exemplary embodiment according to the invention is described with reference to the drawing.

Das in der Zeichnung dargestellte Schaltgerät besteht aus dem Unterteil 1 und der auf diesem aufgesetzten Lichtbogenkammer 2. Im Seitenbereich der Lichtbogenkammer sind zylinderförmige Ausnehmungen 3, an die sich zylinderförmige Ausnehmunien 4 geringeren Durchmessers anschließen, so daß sie einen Durchbruch zum Einführen eines Schnellverschlußhakens 5 ergibt. Der Schnellverschlußhaken 5 ist bolzenförmig ausgebildet und besitzt einen Schraubenkopf 6; auf dem Schaft 7 ist eine Spiraldruckfeder 8 aufgefädelt. Unter Zwischenlage einer Scheibe 9 schließt sich hieran eine Gummibuchse 10 an. Die Gummibuchse 10 liegt auf der unteren Begrenzung 11 der zylinderförmigen Ausnehmung 3 auf. Die Spiraldruckfeder 8 stützt sich am unteren Ende des Kopfes 6 ab. Der zylinderförmige Bolzen mit Kopf 6 wird durch Einfügen eines Stiftes 12 zum Schnellverschlußhaken 5. Die Nutenführung für den Stift 12 im Unterteil 1 und gegebenenfalls auch in der Lichtbogenkammer sind nicht näher dargestellt. Die Erweiterung 13 der Aussparung 14 im Unterteil 1 dient zur Verriegelung des Schnellverschlußhakens 5 im gespannten Zustand, d.h. durch Einführen eines Schraubendrehers in den Schlitz 15 des Schraubenkopfes 6 und Ausüben eines Druckes in Richtung auf die Längsachse des Schnellverschlußhakens, d.h. in Spannrichtung der Federn kommt das Bolzenende zur Auflage auf dem Boden der Aussparung 14 und durch Verdrehen um 90° kommt der Stift 12 in Eingriff mit der Erweiterung 13, so daß die Lichtbogenkammer fest am Unterteil gehalten ist. Tritt nun innerhalb der Lichtbogenkammer ein Überdruck auf, so wird zunächst durch Zusammendrücken der Spiraldruckfeder 8 ein Abheben der Lichtbogenkammer und damit ein Abbau des Überdruckes ermöglicht. Geht die Spiraldruckfeder auf Blockmaß, wird ein weiteres Abheben durch die Verformungsmöglichkeit der Gummibuchse 10 bestimmt und damit eine Dämpfung erreicht, die eine Zerstörung der Lichtbogenkammer verhindern soll. Die Gummibuchse 10 kommt hier zur Anlage an der Innenwandung 16 der Ausnehmung 3.The switching device shown in the drawing consists of the lower part 1 and the arc chamber 2 placed thereon. In the side region of the arc chamber there are cylindrical recesses 3, to which cylindrical recesses 4 of smaller diameter are connected, so that they result in a breakthrough for the insertion of a quick-release hook 5. The quick release hook 5 is bolt-shaped and has a screw head 6; A spiral compression spring 8 is threaded onto the shaft 7. A rubber bushing 10 adjoins this with the interposition of a washer 9. The rubber bushing 10 rests on the lower boundary 11 of the cylindrical recess 3. The spiral compression spring 8 is supported at the lower end of the head 6. The cylindrical bolt with head 6 is by inserting a pin 12 to the quick-release hook 5. The groove guide for the pin 12 in the lower part 1 and possibly also in the arc chamber are not shown in detail. The extension 13 of the recess 14 in the lower part 1 serves to lock the quick-release hook 5 in the tensioned state, i.e. by inserting a screwdriver into the slot 15 of the screw head 6 and exerting pressure in the direction of the longitudinal axis of the quick-release hook, i.e. in the tensioning direction of the springs, the bolt end comes to rest on the bottom of the recess 14 and by turning 90 °, the pin 12 comes into engagement with the extension 13, so that the arc chamber is held firmly on the lower part. If an overpressure now occurs within the arc chamber, compression of the spiral compression spring 8 first enables the arc chamber to be lifted off and thus a relief of the overpressure. If the spiral compression spring goes to block size, further lifting is determined by the possibility of deformation of the rubber bushing 10 and thus damping is achieved which is intended to prevent destruction of the arc chamber. The rubber bushing 10 comes to rest against the inner wall 16 of the recess 3.

Durch die Erfindung ist somit eine Anordnung geschaffen worden, die durch einfache Dimensionierung der Gummibuchse und durch Auswahl des entsprechenden Materials in Zusammenwirkung mit der Spiraldruckfeder 8 Beschädigungen von Lichtbogenkammern beim Auftreten von Überdrücken innerhalb der Kammern verhindert, ohne hierbei einen erheblichen Aufwand treiben zu müssen.The invention thus creates an arrangement that is simple Dimensioning of the rubber bushing and by selection of the appropriate material in cooperation with the spiral compression spring 8 prevents damage to the arc chambers when excess pressures occur within the chambers, without having to make a considerable effort.

Claims (7)

1. Securing arrangement for arcing chambers (2) on base parts (1) of switching devices by means of springy clamping means (8, 10), characterised in that the springy clamping means comprises two resilient members (8,10) of differing spring characteristics, arranged one behind the other, which are dimensioned so that only the member (8) with the weaker spring characteristic can be compressed until no longer compressible in the case of corresponding excess pressure.
2. Arrangement according to claim 1, characterised in that said member is a helical compression spring (8) and the other is a rubber element (10).
3. Arrangement according to claim 2, characterised in that the rubber element is a rubber bushing (10) guided round a securing pin (5), the outer dimension of which bushing is smaller than the dimension of the recess in the arcing chamber (2) holding it, whereby the deformation of the rubber during lifting of the arcing chamber (2) consequently means an engagement of the rubber on the inner wall (16) of the recess (3).
4. Arrangement according to claim 3, characterised in that the series arrangement of the helical compression spring (8) and rubber bushing (10) is guided on the securing pin (5).
5. Arrangement according to claim 3 or 4, characterised in that the securing pin is a quickaction closure hook (5).
6. Arrangement according to one of claims 2 to 5, characterised in that the rubber element (10) comprises silicone rubber.
7. Arrangement according to one of claims 3 to 6, characterised in that the rubber bushing (10) is barrel-shaped on the outside.
EP84115388A 1984-03-15 1984-12-13 Mounting device for arc chambers Expired EP0157934B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84115388T ATE33082T1 (en) 1984-03-15 1984-12-13 MOUNTING ARRANGEMENT FOR ARC CHUTES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843409579 DE3409579A1 (en) 1984-03-15 1984-03-15 FASTENING ARRANGEMENT FOR ARC CHAMBERS
DE3409579 1984-03-15

Publications (2)

Publication Number Publication Date
EP0157934A1 EP0157934A1 (en) 1985-10-16
EP0157934B1 true EP0157934B1 (en) 1988-03-16

Family

ID=6230628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84115388A Expired EP0157934B1 (en) 1984-03-15 1984-12-13 Mounting device for arc chambers

Country Status (6)

Country Link
US (1) US4613734A (en)
EP (1) EP0157934B1 (en)
JP (1) JPS60211733A (en)
AT (1) ATE33082T1 (en)
DE (2) DE3409579A1 (en)
IN (1) IN163483B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3679291D1 (en) * 1985-10-31 1991-06-20 Merlin Gerin KINEMATIC TRANSMISSION CHAIN BETWEEN THE CONTROL MECHANISM AND THE POLES OF AN ELECTRIC LOAD SWITCH WITH A SPRAYED INSULATION HOUSING.
CH682113A5 (en) * 1991-05-29 1993-07-15 Sprecher & Schuh Ag
CN220775183U (en) * 2023-07-17 2024-04-12 阳光电源（上海）有限公司 Explosion-proof box and electrical equipment

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2337809A (en) * 1942-02-13 1943-12-28 Edwin G Gaynor Switch
BE496700A (en) * 1949-06-30
FR1048980A (en) * 1950-12-08 1953-12-28 Westinghouse Electric Corp Damper for circuit breaker
DE1077296B (en) * 1958-09-11 1960-03-10 Siemens Ag Arrangement for securing arc chambers of electrical switchgear
DE1256745B (en) * 1964-12-04 1967-12-21 Patelhold Patentverwertung Contact device in high-frequency circuits
YU31967B (en) * 1967-10-02 1974-02-28 Villamos Berendezes Es Keszule Elektromagnetni ukljucivac sa nosacem
US3538286A (en) * 1968-12-30 1970-11-03 Westinghouse Electric Corp Circuit interrupter support means
DE2315456B2 (en) * 1973-03-26 1978-06-22 Siemens Ag, 1000 Berlin Und 8000 Muenchen Switching device with a damping arrangement
DE7522823U (en) * 1975-07-17 1977-01-13 Siemens Ag, 1000 Berlin Und 8000 Muenchen Electromagnetic switching device
DE2558333A1 (en) * 1975-12-23 1977-07-07 Porsche Ag ELASTIC BEARING
CH330476A4 (en) * 1976-03-17 1977-07-29

Also Published As

Publication number Publication date
IN163483B (en) 1988-10-01
EP0157934A1 (en) 1985-10-16
JPH0360128B2 (en) 1991-09-12
DE3409579A1 (en) 1985-09-19
ATE33082T1 (en) 1988-04-15
DE3469974D1 (en) 1988-04-21
US4613734A (en) 1986-09-23
JPS60211733A (en) 1985-10-24

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