EP0752153B1 - Arc quenching chamber with three barriers for the passage of arc gasses - Google Patents

Arc quenching chamber with three barriers for the passage of arc gasses Download PDF

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Publication number
EP0752153B1
EP0752153B1 EP95913022A EP95913022A EP0752153B1 EP 0752153 B1 EP0752153 B1 EP 0752153B1 EP 95913022 A EP95913022 A EP 95913022A EP 95913022 A EP95913022 A EP 95913022A EP 0752153 B1 EP0752153 B1 EP 0752153B1
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EP
European Patent Office
Prior art keywords
barrier
arc
bars
splitters
quenching chamber
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EP95913022A
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German (de)
French (fr)
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EP0752153A1 (en
EP0752153B2 (en
Inventor
Karl-Heinz Manthe
Martin Böttcher
Günter SEIDLER-STAHL
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Siemens AG
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Siemens AG
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/342Venting arrangements for arc chutes

Definitions

  • the invention relates to an arc quenching chamber for one Circuit breaker with a chamber housing, in the chamber housing arranged arc guide rails and with in mutual extinguishers supported with and one above the quenching plates, three barriers comprehensive cooling arrangement for escaping arc gases, the first barrier immediately above the quenching plates and the second barrier spaced from the first barrier is arranged and wherein the first and the second barrier directed parallel to the end faces of the quenching plates Have passage openings, also with one to the connecting the second barrier, to the outside through the with Exit barrier provided third barrier completed Cooling chamber.
  • the invention has for its object the cooling effect of Arrangement of barriers with the smallest possible dimensions and to improve long life so that at the Exit side of the arc quenching chamber is only a minimal one Safety distance to earthed components is required.
  • the invention In the arc quenching chamber according to the above-mentioned US-A-3 005 892 is that between the second and third Barrier located cooling chamber designed as a mixing chamber, in the arcing gases not only through the first and the second Barrier through, but also past this laterally can enter directly.
  • the invention each have an arc guide rail and the subsequent quenching sheet from one Covered end web, such that arc gases in the between the second and the third barrier cooling chamber can only enter along the webs of the second barrier.
  • the webs In addition to a slotted plate-shaped parts the webs have greater mechanical strength in the dimensioning specified at the outset the property to which Arc gases have a stronger directivity than this slotted panels are capable.
  • This property can still be improved in that the webs of the first and the second barrier has an approximately square cross-sectional shape and that the distance between the barriers is 0.1 to 0.5 times the height of the webs.
  • This arrangement forces the arc gases to flow through the first and the second barrier to a two-way change of direction of 90 °, with partial flows of the gases above the webs of the first barrier directed against each other and thereby braked will. The gases then occur with intensive vortex formation and expansion into the cooling chamber and lose to most of their ionization.
  • On the exit side of the third barrier are therefore the temperature and the Degree of ionization of the gases reduced so much that only a small safety distance from earthed parts note is.
  • the outlet openings of the third barrier can be slit-like trained and parallel to the webs of the first and the second barrier, but offset from it, in be arranged an end wall of the end body.
  • the number and the arrangement of these outlet openings can Duration of the arc gases in the cooling chamber and their Flow rate can be influenced. This can in particular by the fact that the outlet openings in one opposite the webs of the first and the second Barrier deviating division are arranged.
  • the final body can be used as a uniform hollow body made of a thermoset Be made of plastic.
  • FIG. 1 shows an arc quenching chamber Low voltage circuit breaker with a movable Switch contact in section.
  • FIG. 1 Figure 2 A top view of the arc quenching chamber according to FIG. 1 Figure 2 shows.
  • FIGS. 1 and 2 An end piece of the arc extinguishing chamber according to FIGS. 1 and 2 is in Figure 3 with a view of the interior shown bottom side.
  • Figures 4 and 5 are sections IV-IV and V-V in the figure 3rd
  • the arc quenching chamber 1 according to FIG. 1 is a component a low-voltage circuit breaker for use up to 1000 V and a switching capacity up to about 100,000 A.
  • the structure of the circuit breaker for the invention is not essential, are only an upper one Connection rail 2 with a fixed contact piece 3 and an associated movable contact lever 4 with an arcing horn 5 shown.
  • the switch-on position is extended, dash-dotted lines show the switch lever 4 in the off position indicated.
  • the arc quenching chamber 1 has a two-part chamber housing 6 with a lower shaft body 7 and one end body 8 closing at the top.
  • Extinguishing plates 10 are arranged at a mutual distance. This quenching plate arrangement is on both sides by one Arc guide rail 11 or 12 completed, the left arc guide rail 11 with a small distance fixed arcing horn 13 faces and the right Arc guide rail 12 so angled at the lower end is formed that the movable contact lever with his Arc horn 5 in the off position at the end of Bending is present.
  • baffles 10 end in a plane near the top of the shaft body 7 and are against displacement in the longitudinal direction secured by the end body 8.
  • a left end bridge 16 and a right one End web 17 are wider than the webs 15, and in such a way that the last baffle plate 10 and the subsequent arc guide rail 11 or 12 on the end web 16 or 17 are present.
  • the webs 15 in connection with the end webs 16 and 17 form a first barrier 20 for arc gases, that arise when switching and that before Cool and discharge into the free environment are.
  • the bars 21 are one Division unit of the quenching plates 10 arranged shifted, so that every second baffle plate a web 21 with a distance faces.
  • the cross-sectional shape of the webs 15 and 21 is according to the Figures 1 and 4 shaped the same and approximately square.
  • the width b and the height h correspond to the webs 15 and 21 approximately the pitch t of the quenching plates 10.
  • a third Barrier 24 is through an end wall 23 of the end body 8 educated.
  • the end wall 23 contains the outlet openings 26 (Figure 2), through which the cooled and deionized Arc gases leave the arc quenching chamber 1. While the first and second barriers 20 and 22 only one have a small mutual distance d ( Figure 4), the about a quarter of the width b or the height h of the webs 15 or 21, is between the second and third Barrier 22 and 24 provided a greater distance a cooling chamber 25 is formed.
  • the outlet openings 26 of the third barrier 24 are elongated and parallel to the webs 15 and 21 of the first and the second Barrier 20 and 22 arranged.
  • the webs 15 are the first Barrier 20 with one another at the edge by a cross piece 27 connected. This also creates a contact surface for those baffles 10 formed that are not on the webs 15 of the first barrier 20 are present. Furthermore, one Comparison of Figures 2 and 3 to see that the outlet openings 26 are shorter than that by the webs 15 and 21 openings formed. The division dimension of the outlet openings is also 26 deviating from the pitch t ( Figure 1) of the webs 15 and 21 selected. This avoids that one The gap between the webs 21 just has an outlet opening 26 faces.
  • the end body 8 has edge pieces 30 projecting on all sides, 31 and 32 and 33 to rest on the front end of the Manhole body 7. Through holes 34 in the corners of the mentioned edge pieces are for connecting the end body 8 and of the shaft body 7 is provided by means of screws 35.
  • the contact lever 4 is turned off of the position shown in dashed lines position shown moves.
  • resulting switching arcing from the fixed contact 3 and the arcing horn 5 of the contact lever 4 on the Arc guide rails 11 and 12 transferred.
  • the webs 15 practice the first barrier 20 due to its relatively large height and their parallel flanks have a directivity on the gas flow out.
  • the partial flows of the gas then meet the lower surfaces of the webs 21 of the barrier 22 and due to the small distance d between the webs 15 and 21 a deflection forced by about 90 °.
  • a deflection forced by about 90 ° In the space between two webs 21 of the second barrier 22 each meet two deflected partial flows of the arc gases against each other and can the space between the webs 21 only after repeated Leave the deflection by 90 ° in the direction of the cooling chamber 25. This happens with vigorous vortex formation and expansion. This is associated with a strong cooling and one Recombination of load carriers.
  • the dwell time of the arc gases in the cooling chamber 25 is influenced by the dimensioning of the outlet openings 26 Despite the good effectiveness of the arrangement described by Barriers 20, 22 and 24 claim the arrangement described only a relatively small part of the total height the arc quenching chamber 1. Furthermore, no conductive Parts such as wire mesh, mesh made of expanded metal or the like Items needed to achieve the desired cooling and deionization of the arc gases. Therefore stands out the described arc quenching chamber 1 also by a great security against electrical arcing on the Exit side of the quenching plates 10. The safety distance to earthed components to a small extent of about 20 - 60 mm reduced.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)

Description

Die Erfindung betrifft eine Lichtbogenlöschkammer für einen Leistungsschalter mit einem Kammergehäuse, in dem Kammergehäuse angeordneten Lichtbogenleitschienen und mit in gegenseitigem Abstand abgestützten Löschblechen sowie mit einer oberhalb der Löschbleche angeordneten, drei Barrieren umfassenden Kühlanordnung für austretende Lichtbogengase, wobei die erste Barriere unmittelbar oberhalb der Löschbleche und die zweite Barriere im Abstand von der ersten Barriere angeordnet ist und wobei die erste und die zweite Barriere parallel zu Stirnflächen der Löschbleche gerichtete Durchtrittsöffnungen besitzen, ferner mit einer an die zweite Barriere anschließenden, nach außen durch die mit Austrittsöffnungen versehene dritte Barriere abgeschlossenen Kühlkammer.The invention relates to an arc quenching chamber for one Circuit breaker with a chamber housing, in the chamber housing arranged arc guide rails and with in mutual extinguishers supported with and one above the quenching plates, three barriers comprehensive cooling arrangement for escaping arc gases, the first barrier immediately above the quenching plates and the second barrier spaced from the first barrier is arranged and wherein the first and the second barrier directed parallel to the end faces of the quenching plates Have passage openings, also with one to the connecting the second barrier, to the outside through the with Exit barrier provided third barrier completed Cooling chamber.

Eine Lichtbogenlöschkammer der vorstehend genannten Art ist durch die US-A-3 005 892 bekannt geworden. Die Barrieren werden hierbei durch geschlitzte bzw. gelochte plattenförmige Einlagestücke im Kammergehäuse gebildet. Diese Bauteile sind im Betrieb des Leistungsschalters sehr hohen Beanspruchungen ausgesetzt. Mit Rücksicht auf eine ausreichende Lebensdauer der Teile ist daher nur eine beschränkte Kühlwirkung erzielbar. Diese wirkt sich auf den Sicherheitsabstand zu geerdeten Bauteilen aus, der beim Einbau des Leistungsschalters in eine Schaltanlage einzuhalten ist, um einen elektrischen Überschlag aufgrund des Austretens heißer ionisierter Gase aus der Lichtbogenlöschkammer zu vermeiden.An arc quenching chamber of the type mentioned above is known from US-A-3 005 892. The barriers are made by slotted or perforated plate-shaped Insert pieces formed in the chamber housing. These components are very high stresses in the operation of the circuit breaker exposed. With regard to a sufficient lifespan the parts is therefore only a limited cooling effect achievable. This affects the safety distance grounded components when installing the circuit breaker in a switchgear is to be observed electrical flashover due to hotter leakage avoid ionized gases from the arc quenching chamber.

Der Erfindung liegt die Aufgabe zugrunde, die Kühlwirkung der Anordnung von Barrieren bei möglichst geringen Abmessungen und hoher Lebensdauer derart zu verbessern, daß an der Austrittsseite der Lichtbogenlöschkammer nur ein minimaler Sicherheitsabstand zu geerdeten Bauteilen benötigt wird.The invention has for its object the cooling effect of Arrangement of barriers with the smallest possible dimensions and to improve long life so that at the Exit side of the arc quenching chamber is only a minimal one Safety distance to earthed components is required.

Die Aufgabe wird in der eingangsgenannten Lichtbogenlöschkammer gemäß der Erfindung durch folgende Merkmale gelöst:

  • die erste Barriere ist durch im doppelten Teilungsmaß der Löschbleche angeordnete, als Widerlager für je ein Löschblech dienende Stege des Kammergehäuses gebildet,
  • die zweite Barriere ist gleichfalls durch Stege des Kammergehäuses gebildet, die gegenüber den Stegen der ersten Barriere um das Teilungsmaß der Löschbleche versetzt angeordnet sind und
  • die Breite und die Höhe der Stege entsprechen etwa dem Teilungsmaß der Löschbleche.
The object is achieved in the arc extinguishing chamber mentioned at the outset according to the invention by the following features:
  • the first barrier is formed by webs of the chamber housing, which are arranged in double division of the extinguishing plates and serve as abutments for one extinguishing plate,
  • the second barrier is likewise formed by webs of the chamber housing, which are arranged offset from the webs of the first barrier by the pitch of the extinguishing plates and
  • the width and the height of the webs correspond approximately to the division dimension of the fire-fighting plates.

Es erweist sich, daß die Steganordnung wesentlich widerstandsfähiger als geschlitzte bzw. gelochte plattenförmige Bauteile ausführbar ist und daher die gesamte Lichtbogenlöschkammer für einen höheren Druck von Lichtbogengasen ausgelegt werden kann. Daher eignet sich die Erfindung insbesondere für den Bau kompakter Leistungsschalter mit hohem Schaltvermögen.It turns out that the web arrangement is much more resistant as slotted or perforated plate-shaped Components are executable and therefore the entire arc quenching chamber for a higher pressure of arc gases can be interpreted. The invention is therefore suitable especially for building compact circuit breakers with high switching capacity.

Eine Anordnung von Stegen oberhalb der Löschbleche einer Lichtbogenlöschkammer in der Weise, daß jedes zweite der Löschbleche an einem Steg anliegt, ist durch die DE-A-35 41 514 bekannt geworden. Die Stege bilden dabei zugleich ein Austrittsgitter für Lichtbogengase. Sollen diese soweit abgekühlt werden, daß nur noch ein sehr geringer oder kein nennenswerter Abstand zu geerdeten Bauteilen einzuhalten ist, so wird die normale Lichtbogenlöschkammer mit einem Aufsatzstück versehen, dessen Eintrittsseite sich oberhalb der Steganordnung befindet. Demgegenüber wird durch die Erfindung eine Lichtbogenlöschkammer geschaffen, die keines zusätzlichen Aufsatzstückes bedarf und trotz geringer Abmessungen nur einen minimalen Abstand zu geerdeten Bauteilen erfordert. An arrangement of webs above the quenching plates Arc quenching chamber in such a way that every other one of the Extinguishing sheets on a web is due to the DE-A-35 41 514 become known. The webs form at the same time an outlet grille for arc gases. Should this cooled so far that only a very small or no noteworthy distance to earthed components the normal arc quenching chamber with a Attachment piece, the entry side is above the web arrangement. In contrast, the Invention created an arc quenching chamber that none additional attachment piece required and despite less Dimensions only a minimal distance to earthed Components required.

Bei der Lichtbogenlöschkammer nach der eingangs genannten US-A-3 005 892 ist die zwischen der zweiten und der dritten Barriere gelegene Kühlkammer als Mischkammer ausgebildet, in die Lichtbogengase nicht nur durch die erste und die zweite Barriere hindurch, sondern auch seitlich an diesen vorbei direkt eintreten können. Nach einer weiteren Ausgestaltung der Erfindung werden demgegenüber jeweils eine Lichtbogenleitschiene und das anschließende Löschblech von einem Endsteg überdeckt, derart, daß Lichtbogengase in die zwischen der zweiten und der dritten Barriere befindlichen Kühlkammer nur entlang den Stegen der zweiten Barriere eintreten können.In the arc quenching chamber according to the above-mentioned US-A-3 005 892 is that between the second and third Barrier located cooling chamber designed as a mixing chamber, in the arcing gases not only through the first and the second Barrier through, but also past this laterally can enter directly. According to a further embodiment In contrast, the invention each have an arc guide rail and the subsequent quenching sheet from one Covered end web, such that arc gases in the between the second and the third barrier cooling chamber can only enter along the webs of the second barrier.

Neben einer gegenüber geschlitzten plattenförmigen Teilen größeren mechanischen Festigkeit haben die Stege in der eingangs angegebenen Bemessung die Eigenschaft, auf die Lichtbogengase eine stärkere Richtwirkung auszuüben, als dies geschlitzte Platten vermögen. Diese Eigenschaft kann noch dadurch verbessert werden, daß die Stege der ersten und der zweiten Barriere eine etwa quadratische Querschnittsform aufweisen und daß der Abstand zwischen den Barrieren das 0,1-bis 0,5-fache der Höhe der Stege beträgt. Diese Anordnung zwingt die Lichtbogengase beim Durchströmen der ersten und der zweiten Barriere zu einer zweimaligen Richtungsänderung von 90°, wobei Teilströme der Gase oberhalb der Stege der ersten Barriere gegeneinander gelenkt und dadurch abgebremst werden. Die Gase treten dann unter intensiver Wirbelbildung und Expansion in die Kühlkammer ein und verlieren dabei zum größten Teil ihre Ionisierung. An der Austrittsseite der dritten Barriere sind daher die Temperatur und der Ionisierungsgrad der Gase so stark erniedrigt, daß lediglich noch ein geringer Sicherheitsabstand zu geerdeten Teilen zu beachten ist.In addition to a slotted plate-shaped parts the webs have greater mechanical strength in the dimensioning specified at the outset the property to which Arc gases have a stronger directivity than this slotted panels are capable. This property can still be improved in that the webs of the first and the second barrier has an approximately square cross-sectional shape and that the distance between the barriers is 0.1 to 0.5 times the height of the webs. This arrangement forces the arc gases to flow through the first and the second barrier to a two-way change of direction of 90 °, with partial flows of the gases above the webs of the first barrier directed against each other and thereby braked will. The gases then occur with intensive vortex formation and expansion into the cooling chamber and lose to most of their ionization. On the exit side of the third barrier are therefore the temperature and the Degree of ionization of the gases reduced so much that only a small safety distance from earthed parts note is.

Bei einer Unterteilung des Kammergehäuses in einen die Löschbleche aufnehmenden Schachtkörper und einen den Schachtkörper oben abschließenden Endkörper, wie dies an sich z. B. durch die DE-C-29 05 854 bekannt geworden ist, können die erste, die zweite und die dritte Barriere Bestandteil des Endkörpers sein. Diese Gestaltung erweist sich als günstig für die Herstellbarkeit der Steganordnung bei großer Festigkeit. Wie bereits erwähnt, liegt jedes zweite der Löschbleche an einem Steg der ersten Barriere an. Eine gesonderte Befestigungseinrichtung für die jeweils dazwischen liegenden Löschbleche kann dadurch entbehrlich werden, daß die Stege der ersten Barriere durch einen randseitigen Quersteg verbunden sind, der ein Widerlager für jedes zweite, nicht an einem der Stege der ersten Barriere anliegende Löschblech bildet. Durch das Aufsetzen des Endkörpers auf den Schachtkörper werden somit alle Löschbleche erfaßt und gegen Verschiebung gesichert.When dividing the chamber housing into one Extinguishing sheets receiving shaft body and one the shaft body final end body, as this z. B. has become known from DE-C-29 05 854, the first, second and third barriers are part of the End body. This design proves to be cheap for the manufacturability of the web arrangement with large Strength. As already mentioned, every second lies Extinguish sheets on a web of the first barrier. A separate fastening device for each in between lying quenching plates can be dispensed with in that the webs of the first barrier by an edge Crossbar are connected, which is an abutment for every second, not against one of the webs of the first barrier Extinguishing sheet forms. By placing the end body on the Manhole bodies are thus captured and against Movement secured.

Die Austrittsöffnungen der dritten Barriere können schlitzartig ausgebildet und parallel zu den Stegen der ersten und der zweiten Barriere, jedoch gegenüber diesen versetzt, in einer Stirnwand des Endkörpers angeordnet sein. Durch die Zahl und die Anordnung dieser Austrittsöffnungen kann die Verweildauer der Lichtbogengase in der Kühlkammer und ihre Strömungsgeschwindigkeit beeinflußt werden. Dies kann insbesondere dadurch geschehen, daß die Austrittsöffnungen in einer gegenüber den Stegen der ersten und der zweiten Barriere abweichenden Teilung angeordnet sind. Der Endkörper kann als einheitlicher Hohlkörper aus einem duroplastischen Kunststoff hergestellt sein.The outlet openings of the third barrier can be slit-like trained and parallel to the webs of the first and the second barrier, but offset from it, in be arranged an end wall of the end body. Through the The number and the arrangement of these outlet openings can Duration of the arc gases in the cooling chamber and their Flow rate can be influenced. This can in particular by the fact that the outlet openings in one opposite the webs of the first and the second Barrier deviating division are arranged. The final body can be used as a uniform hollow body made of a thermoset Be made of plastic.

Im Unterschied zu vielfach bisher üblichen Ausblasdämpfern an Lichtbogenlöschkammern weist somit die Lichtbogenlöschkammer nach der Erfindung außer den Löschblechen keine zusätzlichen Metallteile auf, die gesondert herzustellen und zu montieren sind.In contrast to blow-out dampers that have been common in the past Arc quenching chambers thus have the arc quenching chamber according to the invention no other than the quenching plates Metal parts to manufacture and assemble separately are.

Die Erfindung wird im folgenden anhand des in den Figuren dargestellten Ausführungsbeispieles näher erläutert. The invention is described below with reference to the figures illustrated embodiment explained in more detail.

Die Figur 1 zeigt eine Lichtbogenlöschkammer eines Niederspannungs-Leistungsschalters mit einem bewegbaren Schaltkontakt im Schnitt.1 shows an arc quenching chamber Low voltage circuit breaker with a movable Switch contact in section.

Eine Draufsicht der Lichtbogenlöschkammer gemäß der Figur 1 zeigt die Figur 2.A top view of the arc quenching chamber according to FIG. 1 Figure 2 shows.

Ein Endstück der Lichtbogenlöschkammer gemäß den Figuren 1 und 2 ist in der Figur 3 mit Blick auf die dem Innenraum zugewandte Unterseite gezeigt.An end piece of the arc extinguishing chamber according to FIGS. 1 and 2 is in Figure 3 with a view of the interior shown bottom side.

Die Figuren 4 und 5 sind Schnitte IV-IV bzw. V-V in der Figur 3.Figures 4 and 5 are sections IV-IV and V-V in the figure 3rd

Die Lichtbogenlöschkammer 1 gemäß der Figur 1 ist Bestandteil eines Niederspannungs-Leistungsschalters für den Einsatz bis 1000 V und ein Schaltvermögen bis etwa 100 000 A. Im Hinblick darauf, daß der Aufbau des Leistungsschalters im übrigen für die Erfindung nicht wesentlich ist, sind nur eine obere Anschlußschiene 2 mit einem feststehenden Schaltstück 3 und ein zugehöriger bewegbarer Kontakthebel 4 mit einem Lichtbogenhorn 5 gezeigt. Ausgezogen ist die Einschaltstellung, strichpunktiert die Ausschaltstellung des Kontakthebels 4 angedeutet.The arc quenching chamber 1 according to FIG. 1 is a component a low-voltage circuit breaker for use up to 1000 V and a switching capacity up to about 100,000 A. With regard insist that the structure of the circuit breaker for the invention is not essential, are only an upper one Connection rail 2 with a fixed contact piece 3 and an associated movable contact lever 4 with an arcing horn 5 shown. The switch-on position is extended, dash-dotted lines show the switch lever 4 in the off position indicated.

Die Lichtbogenlöschkammer 1 weist ein zweiteiliges Kammergehäuse 6 mit einem unteren Schachtkörper 7 und einen diesen oben abschließenden Endkörper 8 auf. In dem Schachtkörper 7 sind mit gegenseitigem Abstand Löschbleche 10 angeordnet. Diese Löschblechanordnung wird beideseitig durch je eine Lichtbogenleitschiene 11 bzw. 12 abgeschlossen, wobei der linken Lichtbogenleitschiene 11 mit geringem Abstand ein ortsfestes Lichtbogenhorn 13 gegenübersteht und die rechte Lichtbogenleitschiene 12 am unteren Ende derart abgewinkelt ausgebildet ist, daß der bewegbare Kontakthebel mit seinem Lichtbogenhorn 5 in der Ausschaltstellung am Ende der Abwinklung anliegt. The arc quenching chamber 1 has a two-part chamber housing 6 with a lower shaft body 7 and one end body 8 closing at the top. In the shaft body 7 Extinguishing plates 10 are arranged at a mutual distance. This quenching plate arrangement is on both sides by one Arc guide rail 11 or 12 completed, the left arc guide rail 11 with a small distance fixed arcing horn 13 faces and the right Arc guide rail 12 so angled at the lower end is formed that the movable contact lever with his Arc horn 5 in the off position at the end of Bending is present.

Die Löschbleche 10 enden in einer Ebene nahe dem oberen Ende des Schachtkörpers 7 und sind gegen Verschiebung in Längsrichtung durch den Endkörper 8 gesichert. Hierzu steht einer Stirnfläche 14 jedes zweiten Löschbleches 10 ein Steg 15 des Endkörpers 8 gegenüber. Ein linker Endsteg 16 und ein rechter Endsteg 17 sind breiter als die Stege 15 ausgebildet, und zwar derart, daß jeweils das letzte Löschblech 10 und die anschließende Lichtbogenleitschiene 11 bzw. 12 an dem Endsteg 16 bzw. 17 anliegen. Die Stege 15 in Verbindung mit den Endstegen 16 und 17 bilden eine erste Barriere 20 für Lichtbogengase, die beim Schalten entstehen und die vor dem Austritt in die freie Umgebung abzukühlen und zu entionisieren sind.The baffles 10 end in a plane near the top of the shaft body 7 and are against displacement in the longitudinal direction secured by the end body 8. There is one Face 14 of each second baffle plate 10 a web 15 of the End body 8 opposite. A left end bridge 16 and a right one End web 17 are wider than the webs 15, and in such a way that the last baffle plate 10 and the subsequent arc guide rail 11 or 12 on the end web 16 or 17 are present. The webs 15 in connection with the end webs 16 and 17 form a first barrier 20 for arc gases, that arise when switching and that before Cool and discharge into the free environment are.

Oberhalb der Barriere 20 befindet sich eine zweite, durch Stege 21 gebildete Barriere 22. Die Stege 21 sind um eine Teilungseinheit der Löschbleche 10 verschoben angeordnet, so daß jedem zweiten Löschblech ein Steg 21 mit einem Abstand gegenübersteht.There is a second one above the barrier 20 Bars 21 formed barrier 22. The bars 21 are one Division unit of the quenching plates 10 arranged shifted, so that every second baffle plate a web 21 with a distance faces.

Die Querschnittsform der Stege 15 und 21 ist gemäß den Figuren 1 und 4 gleich und annähernd quadratisch geformt. Dabei entsprechen die Breite b und die Höhe h der Stege 15 und 21 etwa dem Teilungsmaß t der Löschbleche 10. Eine dritte Barriere 24 wird durch eine Stirnwand 23 des Endkörpers 8 gebildet. Die Stirnwand 23 enthält die Austrittsöffnungen 26 (Figur 2), durch welche die abgekühlten und entionisierten Lichtbogengase die Lichtbogenlöschkammer 1 verlassen. Während die erste und die zweite Barriere 20 bzw. 22 nur einen geringen gegenseitigen Abstand d aufweisen (Figur 4), der etwa ein Viertel der Breite b bzw. der Höhe h der Stege 15 bzw. 21 beträgt, ist zwischen der zweiten und der dritten Barriere 22 bzw. 24 ein größerer Abstand vorgesehen, durch den eine Kühlkammer 25 gebildet wird. Die Austrittsöffnungen 26 der dritten Barriere 24 sind länglich ausgebildet und parallel zu den Stegen 15 und 21 der ersten und der zweiten Barriere 20 und 22 angeordnet.The cross-sectional shape of the webs 15 and 21 is according to the Figures 1 and 4 shaped the same and approximately square. The width b and the height h correspond to the webs 15 and 21 approximately the pitch t of the quenching plates 10. A third Barrier 24 is through an end wall 23 of the end body 8 educated. The end wall 23 contains the outlet openings 26 (Figure 2), through which the cooled and deionized Arc gases leave the arc quenching chamber 1. While the first and second barriers 20 and 22 only one have a small mutual distance d (Figure 4), the about a quarter of the width b or the height h of the webs 15 or 21, is between the second and third Barrier 22 and 24 provided a greater distance a cooling chamber 25 is formed. The outlet openings 26 of the third barrier 24 are elongated and parallel to the webs 15 and 21 of the first and the second Barrier 20 and 22 arranged.

Wie näher die Figur 3 zeigt, sind die Stege 15 der ersten Barriere 20 randseitig durch einen Quersteg 27 miteinander verbunden. Hierdurch wird eine Anlagefläche auch für diejenigen Löschbleche 10 gebildet, die nicht an den Stegen 15 der ersten Barriere 20 anliegen. Ferner ist bei einem Vergleich der Figuren 2 und 3 zu erkennen, daß die Austrittsöffnungen 26 kürzer sind, als die durch die Stege 15 und 21 gebildeten Öffnungen. Auch ist das Teilungsmaß der Austrittsöffnungen 26 abweichend vom Teilungsmaß t (Figur 1) der Stege 15 und 21 gewählt. Hierdurch wird vermieden, daß einem Zwischenraum der Stege 21 gerade eine Austrittsöffnung 26 gegenübersteht.As FIG. 3 shows in greater detail, the webs 15 are the first Barrier 20 with one another at the edge by a cross piece 27 connected. This also creates a contact surface for those baffles 10 formed that are not on the webs 15 of the first barrier 20 are present. Furthermore, one Comparison of Figures 2 and 3 to see that the outlet openings 26 are shorter than that by the webs 15 and 21 openings formed. The division dimension of the outlet openings is also 26 deviating from the pitch t (Figure 1) of the webs 15 and 21 selected. This avoids that one The gap between the webs 21 just has an outlet opening 26 faces.

Wie insbesondere den Figuren 4 und 5 zu entnehmen ist, besitzt der Endkörper 8 allseitig überstehende Randstücke 30, 31 sowie 32 und 33 zur Auflage am stirnseitigen Ende des Schachtkörpers 7. Durchgangslöcher 34 in den Ecken der genannten Randstücke sind zur Verbindung des Endkörpers 8 und des Schachtkörpers 7 mittels Schrauben 35 vorgesehen.As can be seen in particular from FIGS. 4 and 5, the end body 8 has edge pieces 30 projecting on all sides, 31 and 32 and 33 to rest on the front end of the Manhole body 7. Through holes 34 in the corners of the mentioned edge pieces are for connecting the end body 8 and of the shaft body 7 is provided by means of screws 35.

Zur Trennung eines Stromkreises wird der Kontakthebel 4 aus der ausgezogen gezeigten Stellung in die strichpunktiert gezeigte Stellung bewegt. In bekannter Weise wird der entstehende Schaltlichtbogen von dem feststehenden Schaltstück 3 und dem Lichtbogenhorn 5 des Kontakthebels 4 auf die Lichtbogenleitschienen 11 und 12 überführt. Aufgrund magnetischer und thermischer Auftriebskräfte gelangt der Schaltlichtbogen dann in die Löschblechanordnung (Löschbleche 10, Figur 1) und wird dort in eine der Anzahl von Löschblechen 10 entsprechende Anzahl von Teillichtbögen gespalten. Die bis zum Erlöschen des Schaltlichtbogens anfallenden Lichtbogengase entweichen durch die Anordnung von Barrieren 20, 22 und 24 nach außen. Dabei üben zunächst die Stege 15 der ersten Barriere 20 aufgrund ihrer relativ großen Höhe und ihrer parallelen Flanken eine Richtwirkung auf die Gasströmung aus. Die Teilströme des Gases treffen dann auf die unteren Flächen der Stege 21 der Barriere 22 und werden aufgrund des geringen Abstandes d der Stege 15 und 21 zu einer Umlenkung um etwa 90° gezwungen. In dem Raum zwischen zwei Stegen 21 der zweiten Barriere 22 treffen jeweils zwei umgelenkte Teilströme der Lichtbogengase gegeneinander und können den Raum zwischen den Stegen 21 erst nach nochmaliger Umlenkung um 90° in Richtung der Kühlkammer 25 verlassen. Dies geschieht unter lebhafter Wirbelbildung und Expansion. Damit verbunden sind eine starke Abkühlung und eine Rekombination von Ladungsträgern.To disconnect a circuit, the contact lever 4 is turned off of the position shown in dashed lines position shown moves. In a known manner resulting switching arcing from the fixed contact 3 and the arcing horn 5 of the contact lever 4 on the Arc guide rails 11 and 12 transferred. Because of magnetic and thermal buoyancy Switch arc into the quenching plate arrangement (quenching plates 10, Figure 1) and there is one of the number of quenching plates 10 corresponding number of partial arcs split. The accumulated until the switching arc goes out Arc gases escape through the arrangement of barriers 20, 22 and 24 to the outside. First, the webs 15 practice the first barrier 20 due to its relatively large height and their parallel flanks have a directivity on the gas flow out. The partial flows of the gas then meet the lower surfaces of the webs 21 of the barrier 22 and due to the small distance d between the webs 15 and 21 a deflection forced by about 90 °. In the space between two webs 21 of the second barrier 22 each meet two deflected partial flows of the arc gases against each other and can the space between the webs 21 only after repeated Leave the deflection by 90 ° in the direction of the cooling chamber 25. This happens with vigorous vortex formation and expansion. This is associated with a strong cooling and one Recombination of load carriers.

Die Verweildauer der Lichtbogengase in der Kühlkammer 25 ist durch die Bemessung der Austrittsöffnungen 26 zu beeinflussen Trotz der guten Wirksamkeit der beschriebenen Anordnung von Barrieren 20, 22 und 24 beansprucht die beschriebene Anordnung nur einen verhältnismäßig kleinen Teil der Gesamthöhe der Lichtbogenlöschkammer 1. Ferner werden keine leitfähigen Teile wie Drahtgewebe, Gitter aus Streckmetall oder ähnliche Elemente benötigt, um die gewünschte Abkühlung und Entionisierung der Lichtbogengase zu bewirken. Daher zeichnet sich die beschriebene Lichtbogenlöschkammer 1 auch durch eine große Sicherheit gegen elektrische Überschläge an der Austrittsseite der Löschbleche 10 aus. Der Sicherheitsabstand zu geerdeten Bauteilen wird auf ein geringes Maß von etwa 20 - 60 mm vermindert.The dwell time of the arc gases in the cooling chamber 25 is influenced by the dimensioning of the outlet openings 26 Despite the good effectiveness of the arrangement described by Barriers 20, 22 and 24 claim the arrangement described only a relatively small part of the total height the arc quenching chamber 1. Furthermore, no conductive Parts such as wire mesh, mesh made of expanded metal or the like Items needed to achieve the desired cooling and deionization of the arc gases. Therefore stands out the described arc quenching chamber 1 also by a great security against electrical arcing on the Exit side of the quenching plates 10. The safety distance to earthed components to a small extent of about 20 - 60 mm reduced.

Claims (8)

  1. Arc quenching chamber (1) for a circuit breaker, having a chamber housing (6), arc conducting rails (11, 12) arranged in the chamber housing (6), and having splitters (10) supported with mutual clearance, and having a cooling arrangement for exiting arc gases, which cooling arrangement is arranged above the splitters (10) and comprises three barriers, with the first barrier (20) being arranged directly above the splitters (10) and the second barrier (22) being arranged with clearance from the first barrier (20), and with the first and the second barrier (20, 22) having openings aligned in parallel with end areas (14) of the splitters (10), moreover having a cooling chamber (25) which is connected to the second barrier (22) and is sealed to the outside by the third barrier (24) which is provided with outlet openings (26), characterized by the following features:
    the first barrier (20) is formed by bars (15) of the chamber housing (6), which bars are arranged in double spacing (t) of the splitters (10) and are used as abutments for a respective splitter (10),
    the second barrier (22) is likewise formed by bars (21) of the chamber housing (6) which are staggered in relation to the bars (15) of the first barrier (20) by the spacing of the splitters (10), and
    the width (b) and the height (h) of the bars (15, 21) correspond approximately to the spacing (t) between the splitters (10).
  2. Arc quenching chamber according to claim 1, characterized in that a respective arc conducting rail (11, 12) and the subsequent splitter (10) are covered by An end bar (16, 17) in such a way that arc gases can enter into the cooling chamber (25) located between the second and the third barrier (22, 24) only along the bars (21) of the second barrier (22).
  3. Arc quenching chamber according to claim 1 or 2, characterized in that the bars (15, 21) of the first barrier (20) and the second barrier (20, 22) have an approximately square cross-sectional form and in that the clearance (d) between the barriers (20, 22) amounts to 0.1 to 0.5 times the height (h) of the bars (15, 21).
  4. Arc quenching chamber according to one of the preceding claims, characterized in that with the subdivision of the chamber housing (6) into a shaft body (7) which accommodates the splitters and an end body (8) which seals the shaft body (6) [sic] at the top, the first, the second and the third barriers (20, 22, 24) are a component part of the end body (8).
  5. Arc quenching chamber according to claim 4, characterized in that the bars (15) of the first barrier (20) are connected by an edge-side crossbar (27) which forms an abutment for every other splitter (10) which does not abut one of the bars (15) of the first barrier (20).
  6. Arc quenching chamber according to claim 4 or 5, characterized in that the outlet openings (26) of the third barrier (24) are constructed like slots and are arranged parallel to the bars (15, 21) of the first and the second barrier (20, 22), although offset with respect to them, in an end wall (23) of the end body (8).
  7. Arc quenching chamber according to claim 6, characterized in that the outlet openings (26) are arranged with a spacing which differs with respect to the bars (15, 21) of the first and the second barrier (20, 22).
  8. Arc quenching chamber according to one of claims 4 to 6, characterized in that the end body (8) is manufactured as a uniform hollow body from thermosetting plastics.
EP95913022A 1994-03-21 1995-03-10 Arc quenching chamber with three barriers for the passage of arc gasses Expired - Lifetime EP0752153B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4410108A DE4410108C2 (en) 1994-03-21 1994-03-21 Arc quenching chamber with three barriers for the passage of arc gases
DE4410108 1994-03-21
PCT/DE1995/000347 WO1995026033A1 (en) 1994-03-21 1995-03-10 Arc quenching chamber with three barriers for the passage of arc gasses

Publications (3)

Publication Number Publication Date
EP0752153A1 EP0752153A1 (en) 1997-01-08
EP0752153B1 true EP0752153B1 (en) 1998-08-12
EP0752153B2 EP0752153B2 (en) 2002-09-25

Family

ID=6513662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95913022A Expired - Lifetime EP0752153B2 (en) 1994-03-21 1995-03-10 Arc quenching chamber with three barriers for the passage of arc gasses

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US (1) US5756951A (en)
EP (1) EP0752153B2 (en)
JP (1) JPH09510574A (en)
DE (2) DE4410108C2 (en)
WO (1) WO1995026033A1 (en)

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Also Published As

Publication number Publication date
DE4410108C2 (en) 1996-08-22
DE4410108A1 (en) 1995-09-28
US5756951A (en) 1998-05-26
EP0752153A1 (en) 1997-01-08
JPH09510574A (en) 1997-10-21
WO1995026033A1 (en) 1995-09-28
EP0752153B2 (en) 2002-09-25
DE59503170D1 (en) 1998-09-17

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