EP0029482A1 - Gas blast switch - Google Patents

Gas blast switch Download PDF

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Publication number
EP0029482A1
EP0029482A1 EP80104260A EP80104260A EP0029482A1 EP 0029482 A1 EP0029482 A1 EP 0029482A1 EP 80104260 A EP80104260 A EP 80104260A EP 80104260 A EP80104260 A EP 80104260A EP 0029482 A1 EP0029482 A1 EP 0029482A1
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EP
European Patent Office
Prior art keywords
cylinder
piston
switch
push rod
stroke
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.)
Granted
Application number
EP80104260A
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German (de)
French (fr)
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EP0029482B1 (en
Inventor
Johann Blatter
Walter Schaad
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.)
Rockwell Automation Switzerland GmbH
Original Assignee
Sprecher und Schuh AG
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Filing date
Publication date
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Priority to AT80104260T priority Critical patent/ATE2764T1/en
Publication of EP0029482A1 publication Critical patent/EP0029482A1/en
Application granted granted Critical
Publication of EP0029482B1 publication Critical patent/EP0029482B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas

Definitions

  • the invention relates to a gas pressure switch with a movable contact piece fastened to the end of a push rod, which can be brought into and out of engagement with a stationary contact piece, and with a blowing nozzle which gives the free end of the movable contact piece and is fastened to the push rod.
  • a gas pressure switch with a movable contact piece fastened to the end of a push rod, which can be brought into and out of engagement with a stationary contact piece, and with a blowing nozzle which gives the free end of the movable contact piece and is fastened to the push rod.
  • a pump chamber containing extinguishing gas and enclosed by a cylinder, which can be pressurized in the course of a switch-off stroke, the cylinder being displaceably guided on a stationary supported piston.
  • Such switches are known and, thanks to their simple design (stationary supported pistons), have also proven themselves, especially since the cylinder can also serve as a movable nominal current contact, which can serve in and out of engagement with a corresponding, stationary counter contact.
  • the cylinder itself is fastened to the push rod via a flange or via the blowing nozzle, ie with the movable one Contact piece connected, which means that considerable masses must be accelerated, especially at the beginning of the switch-off stroke. This in turn requires a very powerful switch drive.
  • the proposed gas pressure switch according to the invention is characterized in that the blowing nozzle is designed as the bottom of a second piston opposite the first piston, which can be displaced relative to the cylinder in this between two end positions, means being provided around the cylinder during a switch-off stroke in the same direction as the movable contact piece, but to move a smaller distance than this.
  • the means for moving the cylinder in the same direction as the movable contact piece during a switch-off stroke, but for moving a smaller distance can be designed in the simplest embodiment as a drag connection between the blow nozzle designed as a piston and the cylinder itself.
  • This towing connection can have two stops which are arranged at a distance from one another in the cylinder and which fix the end positions of the blowing nozzle with respect to the cylinder, which can be biased in the direction of the switch-off stroke by means of a spring.
  • This spring which is tightened more during the switch-on stroke, also serves as an energy accumulator that supports the drive.
  • the cylinder can also be coupled via a gearbox (lever, friction wheel or gearwheel gearbox) to the push rod which moves the movable contact piece and the blowing nozzle, which gearbox has a reducing effect in the direction of the cylinder.
  • a gearbox lever, friction wheel or gearwheel gearbox
  • the movement of the cylinder with respect to that of the push rod remains well defined in every phase of the switch-off stroke.
  • the pressure gas switch 10 shown is shown in the left half of FIGS. 1-3 in the on position, in the right half in the off position, functionally corresponding components being identified by the same reference numerals.
  • An electrically conductive support 11 carries a tubular insulating housing 12, only partially shown, in which the essential components of the switch are arranged and which contains an extinguishing gas under pressure, for example SF 6 .
  • a pin-shaped contact piece 14 attached to the free end of a push rod 13 is in and out of engagement with a tubular, stationary by means of a drive, not shown, which moves the push rod 13 either in the direction of arrow 15 (switch-off stroke) or arrow 16 (switch-on stroke) arranged contact piece 17 can be brought.
  • a blowing nozzle 18 is fastened by means not shown, which surrounds the movable contact piece 14 with its nozzle space 19 and is in front of it with its narrowest point 20.
  • the inlets 21 of the blowing nozzle 18 are directly connected to a pump chamber 22.
  • the circumference of the pump chamber 22 is delimited by a cylinder 23, which in turn is slidably guided on a pump piston 24.
  • the pump piston 24 is firmly supported on the support 11 by means of several (at least two) columns 25.
  • the blowing nozzle 18 is also slidably mounted in the cylinder 23 and thus also acts as a piston.
  • a first stop 26 and a second stop 27 is formed on the inside of the cylinder 23 at the upper end thereof. These stops are intended to cooperate with the peripheral flange 28 of the blowing nozzle 18 and thus determine the extent of the relative movement of the blowing nozzle 18 in the cylinder 23. These stops 26, 27, together with the peripheral flange 28, form an effective towing connection between the push rod 13 and the cylinder 23.
  • the cylinder 23 is biased in the direction of the switch-off stroke, and the springs 21 act as a force accumulator, which is coupled to the push rod 13 via the cylinder 23, the stop 26, the peripheral flange 28 and supports the drive at least at the beginning of the switch-off movement and for acceleration of the movable contact piece 14 contributes.
  • the movable contact piece moves during the switch-off stroke 14 and with it the blowing nozzle 18 away from the fixed contact piece 17.
  • the cylinder 23 also moves away from the fixed contact piece, but only until the stop 27 comes to rest on the stationary piston 24. Then the cylinder 23 stops, the peripheral flange 28 detaches from the stop 26, and now the blowing nozzle, which now acts as a piston, displaces the extinguishing gas from the remaining pump chamber until the position shown in FIG. 1 on the right is reached.
  • the cylinder 23 has traveled a shorter distance than the switching stroke by the distance indicated by the dimensional arrow 31.
  • the cylinder 23 initially stops and is only raised when the peripheral flange 28 of the blowing nozzle 18 strikes the stop 26, the compression springs 29 then being tensioned again.
  • FIG. 1 While, as mentioned, in FIG. 1 the cylinder 23 is coupled to the push rod 13 via a towing connection, a gear is provided for this coupling in FIGS. 2 and 3, namely a force-locking in FIG. 2 and in FIG. 3 a positive gear.
  • bulges 33 are formed on the circumferentially longitudinally extending sides with an outwardly convex cross section, which are each arranged opposite one of the columns 25 supporting the piston 24.
  • the number of beads 33 (four are shown, but it could just as well be two or three) are attached to the inside of the cylinder 23 in its lower region pairs of inwardly extending bearing plates 34, the bearing plates 34 of a pair each encompassing a column 25 with play.
  • Two pairs of smooth bevel gears 35, 36 are rotatably mounted on a pin 37 on each pair of bearing plates.
  • the two bevel gears 35, 36 of a pair are arranged facing each other with their smaller diameters.
  • the bevel gear 35 is firmly seated on the pin 37 rotatably mounted in the bearing plates 34, while the bevel gear 36 is freely rotatable on the pin 37.
  • the pin 37 extending beyond the bevel gear 36 is under the action of a compression spring 38, so that the bevel gears 35, 36 are resiliently biased toward one another.
  • the bevel gears 35, 36 roll on the one hand on the assigned, stationary column 25, on the other hand on the bead 33 formed on the push rod 13 and thus also act as rolling contacts between the push rod 13 and the relevant column 25, that is, between the movable one Contact piece 14 and the support 11.
  • the stop 27 can also be provided in this embodiment — as indicated by dashed lines — via which the cylinder 23 is then by means of the peripheral flange 28 and under Ueberwin Extension of the frictional connection between the columns 25 and the push rod 13 on the one hand and the bevel gears 35, 36 on the other hand is pressed into its lowest position at the end of the switch-off stroke.
  • a toothed rack 39 is attached to the stationary columns 25 and a toothed rack 40 is also attached to the sides of the push rod 13 opposite the columns 25.
  • bearing brackets 41 are fastened to the inside of the cylinder, in each of which a gear 42 meshing both with the rack 39 and with the rack 40 is freely rotatable.
  • the mode of operation of this embodiment largely corresponds to that of the embodiment according to FIG. 2 with the difference already mentioned that the coupling between the push rod 13 and the cylinder 23 is slip-free.
  • springs can also be provided in the embodiments of FIGS. 2 and 3, which load the cylinder 23 in the direction of the switch-off stroke, and thus also serve as an energy store supporting the switch drive.

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  • Circuit Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Glass Compositions (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

A movable contact element is secured at the end of a thrust rod and therefore can be brought into and out of engagement with a fixed contact element. The free end of the movable contact element is surrounded by a blast nozzle which is likewise secured to the thrust rod. The inlet of the blast nozzle is operatively connected with a pump chamber containing an extinguishing gas and which can be pressurized during the course of a cut-off stroke of the gas-blast switch. This pump chamber is surrounded at its circumference by a cylinder which is displaceably guided upon a stationarily supported piston. To reduce the mass of the parts which are to be accelerated at the start of the cut-off stroke, the blast nozzle itself is constructed as a second piston situated opposite the first-mentioned piston and displaceable relative to the cylinder between two end positions. Means are provided in order to displace, during a cut-off stroke, the cylinder in the same direction or sense as the movable contact element, but however, through a smaller path than such movable contact element.

Description

Die Erfindung betrifft einen Druckgasschalter mit einem am Ende einer Schubstange befestigten, beweglichen Kontaktstück, das in und ausser Eingriff mit einem ortsfesten Kontaktstück bringbar ist, und mit einer das freie Ende des beweglichen Kontaktstückes gebenden, an der Schubstange befestigten Blasdüse, deren Einlass mit einem, ein Löschgas enthaltenden und von einem Zylinder umschlossenen Pumpraum in Verbindung steht, der im Zuge eines Ausschalthubes unter Druck setzbar ist, wobei der Zylinder verschiebbar auf einem ortsfest abgestützten Kolben geführt ist.The invention relates to a gas pressure switch with a movable contact piece fastened to the end of a push rod, which can be brought into and out of engagement with a stationary contact piece, and with a blowing nozzle which gives the free end of the movable contact piece and is fastened to the push rod. is connected to a pump chamber containing extinguishing gas and enclosed by a cylinder, which can be pressurized in the course of a switch-off stroke, the cylinder being displaceably guided on a stationary supported piston.

Solche Schalter sind bekannt und haben sich dank ihrer einfachen Bauweise (ortsfest abgestützter Kolben) auch bewährt, zumal der Zylinder auch als beweglicher Nennstromkontakt dienen kann, der in und ausser Eingriff mit einem entsprechenden, ortsfest angeordneten Gegenkontakt dienen kann. Allerdings ist bei den bekannten Schaltern der Zylinder über einen Flansch oder über die Blasdüse selbst an der Schubstange befestigt, d.h. mit dem beweglichen Kontaktstück verbunden, was zur Folge hat, dass namentlich zu Beginn des Ausschalthubes erhebliche Massen zu beschleunigen sind. Dies erfordert wiederum einen sehr leistungsfähigen Schalterantrieb.Such switches are known and, thanks to their simple design (stationary supported pistons), have also proven themselves, especially since the cylinder can also serve as a movable nominal current contact, which can serve in and out of engagement with a corresponding, stationary counter contact. However, in the known switches, the cylinder itself is fastened to the push rod via a flange or via the blowing nozzle, ie with the movable one Contact piece connected, which means that considerable masses must be accelerated, especially at the beginning of the switch-off stroke. This in turn requires a very powerful switch drive.

Es ist daher ein Zweck der Erfindung, einen Schalter der eingangs genannten Art zu schaffen, bei dem die zu Beginn des Ausschalthubes zu beschleunigenden Massen erheblich reduziert sind, so dass selbst bei weniger leistungsfähigen Antrieben die Kontaktstücke innert kürzester Zeit die minimale Löschdistanz voneinander erreichen, ohne dass die Beblasung des Schaltlichtbogens an Intensität verlieren würde und ohne dass dem Zylinder seine weitere Funktion, gegebenenfalls als beweglichen Nennstromkontakt zu dienen, entzogen würde.It is therefore a purpose of the invention to provide a switch of the type mentioned, in which the masses to be accelerated at the beginning of the switch-off stroke are considerably reduced, so that even with less powerful drives, the contact pieces reach the minimum quenching distance from one another within a very short time, without that the blowing of the switching arc would lose intensity and without the cylinder's further function, possibly serving as a movable nominal current contact, being withdrawn.

Zu diesem Zweck ist der vorgeschlagene Druckgasschalter gemäss der Erfindung dadurch gekennzeichnet, dass die Blasdüse als Boden eines zweiten, dem ersten Kolben gegenüberliegenden Kolben ausgebildet ist, der relativ zum Zylinder in diesem zwischen zwei Endstellungen verschiebbar ist, wobei Mittel vorgesehen sind, um den Zylinder während eines Ausschalthubes gleichsinnig wie das bewegliche Kontaktstück, jedoch um einen geringeren Weg als dieses zu bewegen.For this purpose, the proposed gas pressure switch according to the invention is characterized in that the blowing nozzle is designed as the bottom of a second piston opposite the first piston, which can be displaced relative to the cylinder in this between two end positions, means being provided around the cylinder during a switch-off stroke in the same direction as the movable contact piece, but to move a smaller distance than this.

Da der zwar mit dem beweglichen Kontaktstück mitbewegliche Zylinder einen geringeren Weg als das bewegliche Kontaktstück zurückzulegen hat, ist die hierzu notwendige Arbeit ebenfalls geringer.Since the cylinder, which is movable with the movable contact piece, has to travel a shorter distance than the movable contact piece, the work required for this is also less.

Die Mittel, um den Zylinder während eines Ausschalthubes gleichsinnig wie das bewegliche Kontaktstück, jedoch um einen geringeren Weg zu bewegen, können in der einfachsten Ausführungsform als Schleppverbindung zwischen der als Kolben ausgebildeten Blasdüse und dem Zylinder selbst ausgebildet sein. Diese Schleppverbindung kann zwei im Zylinder im Abstand voneinander angeordnete Anschläge aufweisen, die die Endstellungen der Blasdüse bezüglich des Zylinders festlegen, wobei dieser mittels einer Feder in Richtung des Ausschalthubes vorgespannt sein kann. Diese Feder, die im Zuge des Einschalthubes stärker gespannt wird, dient auch als ein den Antrieb unterstützender Kraftspeicher.The means for moving the cylinder in the same direction as the movable contact piece during a switch-off stroke, but for moving a smaller distance, can be designed in the simplest embodiment as a drag connection between the blow nozzle designed as a piston and the cylinder itself. This towing connection can have two stops which are arranged at a distance from one another in the cylinder and which fix the end positions of the blowing nozzle with respect to the cylinder, which can be biased in the direction of the switch-off stroke by means of a spring. This spring, which is tightened more during the switch-on stroke, also serves as an energy accumulator that supports the drive.

Andererseits kann der Zylinder auch über ein Getriebe (Hebel-, Reibrad- oder Zahnradgetriebe) an die das bewegliche Kontaktstück und die Blasdüse bewegenden Schubstange gekoppelt sein, welches Getriebe in Richtung auf den Zylinder hin untersetzend wirkt. In diesem Falle bleibt die Bewegung des Zylinders in bezug auf jene der Schubstange in jeder Phase des Ausschalthubes wohl definiert.On the other hand, the cylinder can also be coupled via a gearbox (lever, friction wheel or gearwheel gearbox) to the push rod which moves the movable contact piece and the blowing nozzle, which gearbox has a reducing effect in the direction of the cylinder. In this case the movement of the cylinder with respect to that of the push rod remains well defined in every phase of the switch-off stroke.

Weitere Einzelheiten ergeben sich aus der nachfolgenden, rein beispielsweisen Beschreibung von Ausführungsformen des vorgeschlagenen Druckgasschalters anhand der Zeichnung.Further details emerge from the following, purely exemplary description of embodiments of the proposed pressure gas switch with reference to the drawing.

Es zeigt:

  • Fig. 1 einen schematischen Axialschnitt durch die wesentlichen Bestandteile einer ersten Ausführungsform,
  • Fig. 2 in ähnlicher Darstellung wie in Fig. 1 eine zweite Ausführungsform,
  • Fig. 2a einen schematischen Schnitt längs der Linie II-II der Fig. 2, und
  • Fig. 3 eine dritte Ausführungsform.
It shows:
  • 1 is a schematic axial section through the essential components of a first embodiment,
  • 2 in a similar representation as in Fig. 1, a second embodiment,
  • Fig. 2a is a schematic section along the line II-II of Fig. 2, and
  • Fig. 3 shows a third embodiment.

Der dargestellte Druckgasschalter 10 ist jeweils in der linken Bildhälfte der Fig. 1 - 3 in Einschalt-, in der rechten Bildhälfte in Ausschaltstellung gezeigt, wobei sich funktionel entsprechende Bestandteile mit den selben Bezugsziffern bezeichnet sind.The pressure gas switch 10 shown is shown in the left half of FIGS. 1-3 in the on position, in the right half in the off position, functionally corresponding components being identified by the same reference numerals.

Ein elektrisch leitender Stützer 11 trägt ein nur teilweise dargestelltes rohrförmiges Isoliergehäuse 12, in welchem die wesentlichen Bestandteile des Schalters angeordnet sind und welches ein Löschgas unter Druck, beispielsweise SF6 , enthält. Ein am freien Ende einer Schubstange 13 befestigtes, stiftförmiges Kontaktstück 14 ist mittels eines nicht dargestellten Antriebes, der die Schubstange 13 entweder in Richtung des Pfeiles 15 (Ausschalthub) oder des Pfeiles 16 (Einschalthub) bewegt, in und ausser Eingriff mit einem rohrförmigen, ortsfest angeordneten Kontaktstück 17 bringbar. An der Schubstange 13, die mittels Schleifkontakten 32 elektrisch mit dem Stützer 11 verbunden ist, ist durch nicht dargestellte Mittel eine Blasdüse 18 befestigt, die mit ihrem Düsenraum 19 das bewegliche Kontaktstück 14 umgibt und mit ihrer engsten Stelle 20 diesem vorgelagert ist. Wie den Fig. 1 - 3 deutlich zu entnehmen ist, stehen die Einlässe 21 der Blasdüse 18 direkt mit einem Pumpraum 22 in Verbindung. Der Pumpraum 22 ist umfangsseitig von einem Zylinder 23 begrenzt, der seinerseits verschiebbar auf einem Pumpkolben 24 geführt ist. Der Pumpkolben 24 ist über mehrere (wenigstens zwei) Säulen 25 fest auf dem Stützer 11 abgestützt. Die Blasdüse 18 ist ebenfalls verschiebbar im Zylinder-23 gelagert und wirkt somit ebenfalls als Kolben.An electrically conductive support 11 carries a tubular insulating housing 12, only partially shown, in which the essential components of the switch are arranged and which contains an extinguishing gas under pressure, for example SF 6 . A pin-shaped contact piece 14 attached to the free end of a push rod 13 is in and out of engagement with a tubular, stationary by means of a drive, not shown, which moves the push rod 13 either in the direction of arrow 15 (switch-off stroke) or arrow 16 (switch-on stroke) arranged contact piece 17 can be brought. On the push rod 13, which is electrically connected to the support 11 by means of sliding contacts 32, a blowing nozzle 18 is fastened by means not shown, which surrounds the movable contact piece 14 with its nozzle space 19 and is in front of it with its narrowest point 20. As clearly shown in FIGS. 1-3 can be seen, the inlets 21 of the blowing nozzle 18 are directly connected to a pump chamber 22. The circumference of the pump chamber 22 is delimited by a cylinder 23, which in turn is slidably guided on a pump piston 24. The pump piston 24 is firmly supported on the support 11 by means of several (at least two) columns 25. The blowing nozzle 18 is also slidably mounted in the cylinder 23 and thus also acts as a piston.

In Fig. 1 ist an der Innenseite des Zylinders 23 am oberen Ende desselben ein erster Anschlag 26 und im mittleren Bereich ein zweiter Anschlag 27 ausgebildet. Diese Anschläge sind dazu bestimmt, mit dem Umfangsflansch 28 der Blasdüse 18 zusammenzuwirken und legen somit das Ausmass der Relativbewegung der Blasdüse 18 im Zylinder 23 fest. Diese Anschläge 26, 27 bilden zusammen mit dem Umfangsflansch 28 eine zwischen Schubstange 13 und Zylinder 23 wirksame Schleppverbindung. Auf dem Pumpraum 22 abgekehrten Seite des Kolbens 24 sind die einen Enden von die Säulen 25 umgebenden Druckfedern 29 abgestützt, deren anderes Ende auf ein Widerlager 30 drückt, das starr mit dem unteren Ende des Zylinders 23 verbunden ist. Mithin ist der Zylinder 23 in Richtung des Ausschalthubes vorgespannt, und die Federn 21 wirken als Kraftspeicher, der über den Zylinder 23, den Anschlag 26, den Umfangsflansch 28 an die Schubstange 13 gekoppelt ist und den Antrieb zumindest am Anfang der Ausschaltbewegung unterstützt und zur Beschleunigung des beweglichen Kontaktstückes 14 beiträgt.In Fig. 1, a first stop 26 and a second stop 27 is formed on the inside of the cylinder 23 at the upper end thereof. These stops are intended to cooperate with the peripheral flange 28 of the blowing nozzle 18 and thus determine the extent of the relative movement of the blowing nozzle 18 in the cylinder 23. These stops 26, 27, together with the peripheral flange 28, form an effective towing connection between the push rod 13 and the cylinder 23. On the pump chamber 22 facing away from the piston 24, one end is supported by compression springs 29 surrounding the columns 25, the other end of which presses on an abutment 30 which is rigidly connected to the lower end of the cylinder 23. Thus, the cylinder 23 is biased in the direction of the switch-off stroke, and the springs 21 act as a force accumulator, which is coupled to the push rod 13 via the cylinder 23, the stop 26, the peripheral flange 28 and supports the drive at least at the beginning of the switch-off movement and for acceleration of the movable contact piece 14 contributes.

Beim Ausschalthub bewegt sich das bewegliche Kontaktstück 14 und mit diesem die Blasdüse 18 weg vom festen Kontaktstück 17. Der Zylinder 23 entfernt sich ebenfalls vom festen Kontaktstück, jedoch nur bis der Anschlag 27 zur Auflage auf den ortsfesten Kolben 24 gelangt. Sodann bleibt der Zylinder 23 stehen, der Umfangsflansch 28 löst sich vom Anschlag 26,und nun verdrängt die nun als Kolben wirkende Blasdüse das Löschgas aus dem verbleibenden Pumpraum, bis die Stellung gemäss Fig. 1 rechts erreicht ist. Der Zylinder 23 hat einen um die mit dem Masspfeil 31 angegebene Strecke geringeren Weg als der Schalthub zurückgelegt.The movable contact piece moves during the switch-off stroke 14 and with it the blowing nozzle 18 away from the fixed contact piece 17. The cylinder 23 also moves away from the fixed contact piece, but only until the stop 27 comes to rest on the stationary piston 24. Then the cylinder 23 stops, the peripheral flange 28 detaches from the stop 26, and now the blowing nozzle, which now acts as a piston, displaces the extinguishing gas from the remaining pump chamber until the position shown in FIG. 1 on the right is reached. The cylinder 23 has traveled a shorter distance than the switching stroke by the distance indicated by the dimensional arrow 31.

Beim Einschalthub bleibt der Zylinder 23 zunächst stehen und wird erst dann emporgehoben, wenn der Umfangsflansch 28 der Blasdüse 18 auf den Anschlag 26 auftrifft, wobei die Druckfedern 29 dann wieder gespannt werden.During the switch-on stroke, the cylinder 23 initially stops and is only raised when the peripheral flange 28 of the blowing nozzle 18 strikes the stop 26, the compression springs 29 then being tensioned again.

Während, wie erwähnt, in Fig. 1 der Zylinder 23 über eine Schleppverbindung an die Schubstange 13 gekoppelt ist, ist in den Fig. 2 und 3 für diese Koppelung ein Getriebe vorgesehen, und zwar in Fig. 2 ein kraftschlüssiges und in Fig. 3 ein formschlüssiges Getriebe.While, as mentioned, in FIG. 1 the cylinder 23 is coupled to the push rod 13 via a towing connection, a gear is provided for this coupling in FIGS. 2 and 3, namely a force-locking in FIG. 2 and in FIG. 3 a positive gear.

Wie aus den Fig. 2 und 2a ersichtlich ist, sind bei dieder Ausführungsform an der Schubstange 13 umfangsseitig längs sich erstreckende Wülste 33 mit nach aussen konvexem Querschnitt angeformt, die jeweils gegenüber einer der den Kolben 24 stützenden Säulen 25 angeordnet sind. Entsprechend der Anzahl Wülste 33 (dargestellt sind deren vier, es könnten aber ebensogut nur deren zwei oder drei sein) sind an der Innenseite des Zylinders 23 in dessen unterem Bereich Paare von nach innen sich erstreckenden Lagerlaschen 34 befestigt, wobei die Lagerlaschen 34 eines Paares jeweils eine Säule 25 mit Spiel umgreifen. An jedem Paar Lagerlaschen sind zwei Paare glatter Kegelräder 35, 36 auf einem Zapfen 37 drehbar gelagert. Die beiden Kegelräder 35, 36 eines Paares sind mit ihrem kleineren Durchmesser einander zugekehrt angeordnet. Das Kegelrad 35 sitzt fest auf dem in den Lagerlaschen 34 drehbar gelagerten Zapfen 37, während das Kegelrad 36 frei drehbar auf dem Zapfen 37 ist. Der über das Kegelrad 36 hinausreichende Zapfen 37 steht unter der Wirkung einer Druckfeder 38, so dass die Kegelräder 35, 36 federnd aufeinander zu vorgespannt sind. Mit ihrer Mantelfläche wälzen sich die Kegelräder 35, 36 einerseits an der zugeordneten, ortsfesten Säule 25 ab, andererseits an dem an der Schubstange 13 angeformten Wulst 33 und wirken somit auch als Rollkontakte zwischen der Schubstange 13 und der betreffenden Säule 25, also zwischen dem beweglichen Kontaktstück 14 und dem Stützer 11.As can be seen from FIGS. 2 and 2a, in the embodiment of the push rod 13, bulges 33 are formed on the circumferentially longitudinally extending sides with an outwardly convex cross section, which are each arranged opposite one of the columns 25 supporting the piston 24. According to the number of beads 33 (four are shown, but it could just as well be two or three) are attached to the inside of the cylinder 23 in its lower region pairs of inwardly extending bearing plates 34, the bearing plates 34 of a pair each encompassing a column 25 with play. Two pairs of smooth bevel gears 35, 36 are rotatably mounted on a pin 37 on each pair of bearing plates. The two bevel gears 35, 36 of a pair are arranged facing each other with their smaller diameters. The bevel gear 35 is firmly seated on the pin 37 rotatably mounted in the bearing plates 34, while the bevel gear 36 is freely rotatable on the pin 37. The pin 37 extending beyond the bevel gear 36 is under the action of a compression spring 38, so that the bevel gears 35, 36 are resiliently biased toward one another. With their outer surface, the bevel gears 35, 36 roll on the one hand on the assigned, stationary column 25, on the other hand on the bead 33 formed on the push rod 13 and thus also act as rolling contacts between the push rod 13 and the relevant column 25, that is, between the movable one Contact piece 14 and the support 11.

Daraus ergibt sich, dass sowohl beim Ausschalt- als auch beim Einschalthub die Bewegung der Schubstange 13 gleichsinnig auf den Zylinder 23 übertragen wird, der jedoch nur die Hälfte des Weges der Schubstange 13 zurücklegt. Da die Koppelung des Zylinders 23 an die Schubstange 13 kraftschlüssig, also nicht zwingend schlupffrei ist, kann auch bei dieser Ausführungsform - wie gestrichelt angegeben - der Anschlag 27 vorgesehen sein, über den dann der Zylinder 23 mittels des Umfangsflansches 28 und unter Ueberwindung des Kraftschlusses zwischen den Säulen 25 sowie der Schubstange 13 einerseits und den Kegelrädern 35, 36 andererseits am Ende des Ausschalthubes in seine unterste Stellung gedrückt wird. Entsprechendes gilt beim Einschalthub für den Anschlag 26, über den der Umfangsflansch 28 am Ende des Einschalthubes den Zylinder 23 in die oberste Stellung drückt.The result of this is that the movement of the push rod 13 is transmitted in the same direction to the cylinder 23 both during the switch-off and switch-on stroke, but this only covers half the travel of the push rod 13. Since the coupling of the cylinder 23 to the push rod 13 is non-positive, that is to say not necessarily free of slippage, the stop 27 can also be provided in this embodiment — as indicated by dashed lines — via which the cylinder 23 is then by means of the peripheral flange 28 and under Ueberwin Extension of the frictional connection between the columns 25 and the push rod 13 on the one hand and the bevel gears 35, 36 on the other hand is pressed into its lowest position at the end of the switch-off stroke. The same applies to the switch-on stroke for the stop 26, via which the peripheral flange 28 presses the cylinder 23 into the uppermost position at the end of the switch-on stroke.

Der wesentliche Unterschied zwischen der Ausführungsform der Fig. 2 und jener der Fig. 3 besteht darin, dass die Getriebekoppelung zwischen der Schubstange 13 und dem Zylinder 23 formschlüssig, also schlupffrei ist.The main difference between the embodiment of FIG. 2 and that of FIG. 3 is that the gear coupling between the push rod 13 and the cylinder 23 is form-fitting, that is to say free of slip.

Zu diesem Zweck ist an den ortsfesten Säulen 25 je eine Zahnstange 39 und an den den Säulen 25 gegenüberliegenden Seiten der Schubstange 13 ebenfalls eine Zahnstange 40 befestigt. Im unteren Bereich des Zylinders 23 sind an dessen Innenseite Lagerausleger 41 befestigt, in denen je ein sowohl mit der Zahnstange 39 als auch mit der Zahnstange 40 kämmendes Zahnrad 42 frei drehbar gelagert ist. Die Wirkungsweise dieser Ausführungsform entspricht weitgehend jener der Ausführungsform gemäss Fig. 2 mit dem bereits genannten Unterschied, dass die Koppelung zwischen Schubstange 13 und Zylinder 23 schlupffrei ist.For this purpose, a toothed rack 39 is attached to the stationary columns 25 and a toothed rack 40 is also attached to the sides of the push rod 13 opposite the columns 25. In the lower area of the cylinder 23, bearing brackets 41 are fastened to the inside of the cylinder, in each of which a gear 42 meshing both with the rack 39 and with the rack 40 is freely rotatable. The mode of operation of this embodiment largely corresponds to that of the embodiment according to FIG. 2 with the difference already mentioned that the coupling between the push rod 13 and the cylinder 23 is slip-free.

Wie bei der Fig. 1 können auch bei den Ausführungsformen der Fig. 2 und 3 Federn vorgesehen sein, die den Zylinder 23 in Richtung des Ausschalthubes belasten, und somit auch als den Schalterantrieb unterstützenden Kraftspeicher dienen.As in FIG. 1, springs can also be provided in the embodiments of FIGS. 2 and 3, which load the cylinder 23 in the direction of the switch-off stroke, and thus also serve as an energy store supporting the switch drive.

Claims (8)

1. Druckgasschalter mit einem am Ende einer Schubstange befestigten, beweglichen Kontaktstück, das in und ausser Eingriff mit einem ortsfesten Kontaktstück bringbar ist, und mit einer das freie Ende des beweglichen Kontaktstükkes umgebenden, an der Schubstange befestigten Blasdüse, deren Einlass mit einem, ein Löschgas enthaltenden und von einem Zylinder umschlossenen Pumpraum in Verbindung steht, der im Zuge eines Ausschalthubes unter Druck setzbar ist, wobei der Zylinder verschiebbar auf einem ortsfest abgestützten Kolben geführt ist, dadurch gekennzeichnet, dass die Blasdüse (18) als Boden eines zweiten, dem ersten Kolben (24) gegenüberliegenden Kolben ausgebildet ist, der relativ zum Zylinder (23) in diesem zwischen zwei Endstellungen verschiebbar ist, wobei Mittel (26 - 29; 33 - 35; 39 - 42) vorgesehen sind, um den Zylinder (23) während eines Ausschalthubes gleichsinnig wie das bewegliche Kontaktstück (14) jedoch um einen geringeren Weg als dieses zu bewegen.1.Gas switch with a movable contact piece attached to the end of a push rod, which can be brought into and out of engagement with a stationary contact piece, and with a blowing nozzle which surrounds the free end of the movable contact piece and is attached to the push rod, the inlet of which with an extinguishing gas Containing pump chamber and enclosed by a cylinder, which can be pressurized in the course of a switch-off stroke, the cylinder being displaceably guided on a fixedly supported piston, characterized in that the blowing nozzle (18) acts as the base of a second piston, the first piston (24) opposite piston is formed, which is displaceable relative to the cylinder (23) in this between two end positions, means (26-29; 33-35; 39-42) being provided around the cylinder (23) during a switch-off stroke in the same direction as the movable contact piece (14) but by a smaller distance than to move this. 2. Druckgasschalter nach Patentanspruch 1, dadurch gekennzeichnet, dass im Zylinder (23) zwei Anschläge (26, 27) vorhanden sind, die die beiden Endstellungen der Blasdüse (18) im Zylinder (23) festlegen, wobei der Zylinder (23) mittels wenigstens einer Feder (21) in Ausschaltrichtung belastet ist.2. Gas pressure switch according to claim 1, characterized in that in the cylinder (23) there are two stops (26, 27) which define the two end positions of the blowing nozzle (18) in the cylinder (23), the cylinder (23) by means of at least a spring (21) is loaded in the switch-off direction. 3. Druckgasschalter nach Patentanspruch 2, dadurch gekennzeichnet, dass die Feder (29) einerends auf der dem Pumpraum (22) abgekehrten Seite des ortsfest abgestützten Kolbens (24) und andernends auf einem mit dem Zylinder (23) fest verbundenen Widerlager (30) abgestützt ist.3. D jerk-gas switch according to claim 2, characterized in that the spring (29) at one end on the umpraum (22) side facing away from the fixedly supported piston (24) and at the other to a firmly connected to the cylinder (23) abutment (30 P ) is supported. 4. Druckgasschalter nach Patentanspruch 1, dadurch gekennzeichnet, dass der Zylinder (23) über ein untersetzendes Getriebe (33 - 35; 39 - 42) an die Schubstange (13) gekoppelt ist.4. Gas switch according to claim 1, characterized in that the cylinder (23) via a reduction gear (33 - 35; 39 - 42) is coupled to the push rod (13). 5. Druckgasschalter nach Patentanspruch 4, bei dem der ortsfest abgestützte Kolben von wenigstens einer Säule getragen ist, dadurch gekennzeichnet, dass das untersetzende Getriebe Reibräder (35) aufweist, deren Umfang einerseits an der Schubstange (13) und andererseits an der Säule (25) angreift,und die ihrerseits an einem Zylinder (23) befestigten Lagerausleger (34) drehbar gelagert sind.5. D jerk-gas switch according to claim 4, wherein the stationarily supported piston of at least one column is supported, characterized in that the under-setting mechanism has friction wheels (35), the periphery of one side on the push rod (13) and on the other hand on the column (25 ) engages, and the in turn attached to a cylinder (23) bearing bracket (34) are rotatably mounted. 6. Druckgasschalter nach Patentanspruch 4, bei dem der ortsfest abgestützte Kolben von wenigstens einer Säule getragen ist, dadurch gekennzeichnet, dass das untersetzende Getriebe wenigstens ein Zahnrad (42) aufweist, das sowohl mit einer an der Schubstange (13) befestigten als auch mit einer an der Säule (25) befestigten Zahnstange (40 bzw. 39) kämmt, und das in einem am Zylinder (23) befestigten Lagerausleger (41) drehbar gelagert ist.6. D ruckgassschalter according to claim 4, in which the stationary piston of at least one column , characterized in that the step-down gear has at least one gear (42) which meshes with both a gear rod (13) and a gear rod (25) attached to the column (25), and which is rotatably mounted in a bearing bracket (41) attached to the cylinder (23). 7. Druckgasschalter nach Patentantspruch 5, dadurch gekennzeichnet, dass die Reibräder je ein Paar gleichachsige mit ihren kleineren Durchmessern einander zugekehrte, glatte Kegelräder (35) aufweisen, die federnd aufeinander zu vorgespannt sind.7. Gas pressure switch according to patent claim 5, characterized in that the friction wheels each have a pair of coaxial with their smaller diameters facing each other, smooth bevel gears (35) which are resiliently biased towards each other. 8. Druckgasschalter nach Patentanspruch 7, dadurch gekennzeichnet, dass die Mantelflächen der Kegelräder (35) jedes Paares je an einem an der Schubstange (13) vorhandenen, achsial sich erstreckendem und im Querschnitt konvexen Wulst (33) angreifen.8. Gas-blast switch according to claim 7, characterized in that the outer surfaces of the bevel gears (35) of each pair each engage an axially extending and cross-sectionally convex bead (33) on the push rod (13).
EP80104260A 1979-11-22 1980-07-19 Gas blast switch Expired EP0029482B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80104260T ATE2764T1 (en) 1979-11-22 1980-07-19 GAS SWITCH.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH10413/79 1979-11-22
CH1041379A CH642481A5 (en) 1979-11-22 1979-11-22 EXHAUST GAS SWITCH.

Publications (2)

Publication Number Publication Date
EP0029482A1 true EP0029482A1 (en) 1981-06-03
EP0029482B1 EP0029482B1 (en) 1983-03-09

Family

ID=4362958

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104260A Expired EP0029482B1 (en) 1979-11-22 1980-07-19 Gas blast switch

Country Status (6)

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US (1) US4379958A (en)
EP (1) EP0029482B1 (en)
JP (1) JPS5686421A (en)
AT (1) ATE2764T1 (en)
CH (1) CH642481A5 (en)
DE (1) DE3062280D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0999569A2 (en) * 1998-11-02 2000-05-10 Asea Brown Boveri Ag Power switch

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH658745A5 (en) * 1982-10-25 1986-11-28 Sprecher & Schuh Ag EXHAUST GAS SWITCH.
DE3322597A1 (en) * 1983-05-31 1984-12-06 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau EXHAUST GAS SWITCH

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1216407B (en) * 1960-05-27 1966-05-12 Calor Emag Elektrizitaets Ag Electrical switch with self-generated extinguishing agent, especially compressed gas flow
CH517371A (en) * 1970-06-24 1971-12-31 Bbc Brown Boveri & Cie Electric compression switch
FR2226740A1 (en) * 1973-04-17 1974-11-15 Hitachi Ltd
DE2336684A1 (en) * 1973-07-19 1975-01-30 Bbc Brown Boveri & Cie Gas-blast cct. breaker with two nozzle contacts - has both contacts moving over different paths for arc extinguishing
FR2346841A1 (en) * 1976-03-30 1977-10-28 Merlin Gerin Self actuating switch with dash pot damping - has terminals assemblies set in wall of sealed housing

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH524886A (en) * 1970-12-01 1972-06-30 Bbc Brown Boveri & Cie Electric compression switch
JPS5913816B2 (en) * 1975-05-29 1984-04-02 三菱電機株式会社 switch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1216407B (en) * 1960-05-27 1966-05-12 Calor Emag Elektrizitaets Ag Electrical switch with self-generated extinguishing agent, especially compressed gas flow
CH517371A (en) * 1970-06-24 1971-12-31 Bbc Brown Boveri & Cie Electric compression switch
FR2226740A1 (en) * 1973-04-17 1974-11-15 Hitachi Ltd
DE2336684A1 (en) * 1973-07-19 1975-01-30 Bbc Brown Boveri & Cie Gas-blast cct. breaker with two nozzle contacts - has both contacts moving over different paths for arc extinguishing
FR2346841A1 (en) * 1976-03-30 1977-10-28 Merlin Gerin Self actuating switch with dash pot damping - has terminals assemblies set in wall of sealed housing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0999569A2 (en) * 1998-11-02 2000-05-10 Asea Brown Boveri Ag Power switch
EP0999569A3 (en) * 1998-11-02 2002-09-18 ABB Schweiz AG Power switch

Also Published As

Publication number Publication date
DE3062280D1 (en) 1983-04-14
CH642481A5 (en) 1984-04-13
US4379958A (en) 1983-04-12
ATE2764T1 (en) 1983-03-15
JPS5686421A (en) 1981-07-14
EP0029482B1 (en) 1983-03-09
JPH0154813B2 (en) 1989-11-21

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