JP2018181502A - Gas-blast circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-blast circuit breaker mounting a bidirectional drive mechanism capable of balancing high reliability and compaction.SOLUTION: In an electrical switchgear where a drive side electrode and a driven side electrode are provided oppositely in a sealed tank 100, the drive side electrode has a drive side main electrode 2 and a drive side arc electrode 4, the driven side electrode has a driven side main electrode 3 and a driven side arc electrode 5, the driven side arc electrode 5 is connected with an actuator 1, and the driven side arc electrode 5 is connected with a bidirectional drive mechanism 10, the bidirectional drive mechanism 10 has a guide 14 for holding a drive side connecting rod 11 and a driven side connecting rod 13 so as to move therethrough translatably, and two levers 12 placed on both outsides of the guide 14, and fixed rotatably by fitting to a cylinder protrusion 15 molded integrally with the guide 14, connecting the drive side connecting rod 11 and the driven side connecting rod 13, and making the driven side connecting rod 13 operate in the opposite direction for the operation of the drive side connecting rod 11.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gas circuit breaker used to shut off a short circuit current in a substation or switching station of a power system, and more particularly to a gas circuit breaker having a bidirectional drive mechanism for driving electrodes in opposite directions.

  Switching devices such as gas circuit breakers are used to cut off an accident current or a leading small current generated in the electric power system to protect the electric power transmission network, and in particular, the gas circuit breakers have a high penetration rate. As the gas circuit breaker, a so-called puffer type is generally used which shuts off the current by blowing a compressed gas to the arc generated between the electrodes by utilizing an arc-extinguishing gas pressure rise during the opening operation.

  Compressed gas is obtained by mechanical compression and thermal compression. The former drives the puffer cylinder connected to the electrode by the energy of the operating device that uses hydraulic pressure and springs as the drive source, and compresses the arc-extinguishing gas by reducing the volume of the compression chamber between the puffer piston and It sprays on the arc. The latter is to increase the pressure of the arc-extinguishing gas by the heat from the arc, to apply an operating force and to directly spray the arc-extinguishing gas to the arc.

  A puffer type circuit breaker is known which uses a fixed volume thermal expansion chamber and is used in combination with a mechanical compression chamber which reduces the volume at the time of opening as one utilizing arc heat for forming the spray pressure.

  Although it is necessary to increase the opening speed in order to improve the interrupting performance of the puffer-type gas circuit breaker, it is necessary to increase the operation energy of the operating device, which causes a cost increase due to an increase in size of the device. It becomes.

  Therefore, by driving the arc electrode on the driven side, which has conventionally been fixed, in the direction opposite to the opening direction, the bi-directional drive system can reduce the operation energy by relatively reducing the drive distance of the drive side electrode. Proposed. For example, a driving method using a fork type lever has also been proposed (Patent Document 1). In this method, the main contact on the driven side is fixed to drive the arc contact, and a pin interlocked with the movement of the drive side electrode contacts the recessed portion of the fork, so that the fork type lever rotates. By converting this to reciprocation in the opening and closing direction, the arc electrode on the driven side is driven in the direction opposite to the driving direction of the driving side electrode.

  As another drive method, a drive side electrode and a driven side electrode are connected via a groove cam and a link and a pin provided on a rotary lever, and the link operation at the time of opening and closing operation of the drive side electrode is made by turning the lever. There is also proposed a method of converting and operating the driven side electrode in the opposite direction to the driving side electrode (Patent Document 2).

U.S. Pat. No. 6,271,494 JP, 2015-72817, A

  In Patent Document 1, when the pin hits the fork-type lever or when the operation of the driven electrode is stopped, the strength reliability becomes an issue with respect to the inertial force acting on the pin. In order to solve the problem, it is necessary to increase the diameter of the pin, and the fork lever and the size of the entire bi-directional mechanism become problems.

  In Patent Document 2, since the lever is stopped by applying the lever to the buffer structure at the time of the opening / closing operation stop, a part of the impact load caused by the inertia force at the time of the closing operation is absorbed by the buffer structure, and the stress generated in the pin is reduced. It becomes possible. However, in the buffer structure of this system, the cross-sectional shape in the direction orthogonal to the opening and closing direction is circular. Therefore, the contact area between the lever and the buffer structure is reduced, the contact pressure at the time of contact is increased, and the early prevention of the lever and buffer structure from becoming loose becomes an issue. Also, the buffer structure is attached to the sealed container. For example, in the case of using a bolt, the buffer structure is attached to the sealed container in a direction orthogonal to the opening and closing direction, that is, in the axial direction of the buffer structure. Therefore, since the bolt bears the impact load transmitted when the lever is received in the shear direction with low strength, the strength reliability of the bolt becomes an issue. In order to solve the problem, it may be necessary to increase the size of the lever and the buffer structure. Also. Since it is necessary to remove a buffer structure at the time of maintenance of a circuit breaker or a bidirectional drive mechanism, the fall of maintainability also becomes a subject.

  An object of the present invention is to provide a gas circuit breaker equipped with a bidirectional drive mechanism that can achieve both high structural reliability and small size in operation.

  According to the solution means of the present invention, there is provided a gas circuit breaker comprising a drive-side main electrode and a drive-side arc electrode, connected to a manipulator, and provided in a sealed tank, The device includes: a driven side electrode having an electrode and a driven side arc electrode and provided in the sealed tank so as to face the drive side electrode; and a bidirectional drive mechanism portion, wherein the bidirectional drive mechanism portion A drive-side connection rod receiving a drive force from the drive-side electrode, a driven-side connection rod connected to the driven-side arc electrode 5, the drive-side connection rod, and the driven side connection rod translate inside A guide which is held to move freely, a cylindrical projection which is mutually integrally formed on both outer sides of the guide, and a cylindrical projection which are mutually rotatably fixed by the cylindrical projection, and the drive side connection rod and the drive side connection Connect the rods, The relative operation of the moving-side connecting rod with two levers for operating in the opposite direction to the driven side coupling rod, the gas circuit breaker is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the gas circuit breaker which mounts the bidirectional | two-way drive mechanism which can make high reliability and the miniaturization of the structure at the time of operation compatible can be provided.

FIG. 2 is a detail view of the side surface of the bidirectional drive mechanism of the gas circuit breaker according to the first embodiment. FIG. 2 is an exploded perspective view of a bidirectional drive mechanism part of the gas circuit breaker according to the first embodiment. FIG. 2 is a stroke characteristic diagram of the gas circuit breaker according to the first embodiment. FIG. 2 is a view showing a state of closing of the gas circuit breaker according to the first embodiment. FIG. 7 is a view showing a state immediately before the operation of the driven side arc electrode during interruption of the gas circuit breaker according to the first embodiment. FIG. 7 is a view showing a state immediately after the start of the operation of the driven arc electrode, with the drive-side movable pin coming in contact with the connecting portion of the first grooved cam during the opening of the gas circuit breaker according to the first embodiment. FIG. 8 is a view showing a state in which the operation of the driven side arc electrode is finished immediately after the drive side movable pin leaves the connecting portion of the first grooved cam during the opening of the gas circuit breaker according to the first embodiment. FIG. 2 is a diagram showing an open state of the gas circuit breaker according to the first embodiment. The moment acting on the lever when the driven side electrode of the gas circuit breaker according to Embodiment 1 is stopped, the impact load acting on the driving side movable pin and the driven side movable pin due to it, and the bending generated on the cylindrical projection The schematic diagram shown about stress. The moment acting on the lever when the driven side electrode of the gas circuit breaker according to Embodiment 1 is stopped, the impact load acting on the driving side movable pin and the driven side movable pin due to it, and the bending generated on the cylindrical projection The schematic diagram shown about reduction of a stress. FIG. 7 is a view showing a fitting state of the lever and the cylindrical protrusion of the gas circuit breaker according to the first embodiment via a bush. FIG. 8 is a view showing a fitted state via bearings in the fitting portion of the cylindrical protrusion of the lever of the gas circuit breaker according to the first embodiment. The disassembled perspective view which shows the mechanism structure which made the lever the bell crank shape regarding the bidirectional | two-way drive mechanism part of the gas circuit breaker which concerns on Example 2. FIG.

  Hereinafter, embodiments of the present invention will be described using a gas circuit breaker with reference to the drawings.

  FIG. 4 shows the closing state of the gas circuit breaker according to the first embodiment.

  The drive electrode and the driven electrode are coaxially opposed to each other in the sealed container 100. The drive side electrode has a drive side main electrode 2 and a drive side arc electrode 4, and the driven electrode has a driven side main electrode 3 and a driven side arc electrode 5.

  The controller 1 is provided adjacent to the sealed container 100. One end of a shaft 6 is connected to the controller 1, and the other end of the shaft 6 is connected to a driving arc electrode 4. The shaft 6 and the drive side arc electrode 4 are connected through the inside of the mechanical compression chamber 7 and the thermal expansion chamber 9.

  The drive-side main electrode 2 and the nozzle 8 are provided on the blocking portion side of the thermal expansion chamber 9. A driven side arc electrode 5 is provided coaxially to face the driving side arc electrode 4. One end of the driven side arc electrode 5 and the tip of the nozzle 8 are connected to the bidirectional drive mechanism 10 through a fastening ring 22.

  As shown in FIG. 4, in the closed state, the gas circuit breaker is set at a position where the drive side main electrode 2 and the driven side main electrode 3 are electrically connected by the hydraulic pressure of the operating device 1 or the drive source by the spring. Configure the power system circuit of

  When blocking a short circuit current due to lightning strike or the like, the controller 1 is driven in the opening direction, and the drive-side main electrode 2 and the driven-side main electrode 3 are separated via the shaft 6. At this time, an arc is generated between the drive side arc electrode 4 and the driven side arc electrode 5. The generated arc is extinguished by mechanical arc extinguishing gas spraying by the mechanical compression chamber 7 and arc extinguishing gas spraying utilizing arc heat by the thermal expansion chamber 9 to shut off the current.

  In order to reduce the operation energy of the puffer type gas circuit breaker, a bidirectional drive mechanism 10 is provided which drives the driven side arc electrode 5 fixed in the prior art in the direction opposite to the drive direction of the drive side electrode.

  The bi-directional driving method in the present embodiment will be described below based on FIGS. 1 and 2. FIG. 1 is a detailed view of the side surface of the bidirectional drive mechanism portion of the gas circuit breaker according to the present embodiment. FIG. 2 is an exploded perspective view of the bidirectional drive mechanism portion of the gas circuit breaker according to the present embodiment.

  As shown in FIGS. 1 and 2, the bi-directional drive mechanism 10 holds the drive-side connecting rod 11 and the driven-side connecting rod 13 so as to be movable in the Y-axis direction, which is the drive operation direction, by the guide 14. In addition, it is configured to be connected by a lever 12 rotatably provided via cylindrical projections 15 integrally formed on both outer sides with the respective guides 14.

  A first grooved cam 16 is cut into the drive side connecting rod 11, and the first grooved cam 16 includes a first linear portion 16A, a connecting portion 16B, and a second linear portion 16C, as viewed from the operating device 1 side. . The first straight portion 16A and the second straight portion 16C are provided on axes different from each other in the Y-axis direction, and the connection portion 16B is provided therebetween. The displacement width of the first groove cam 16 in the Z-axis direction is configured to fall within the displacement width of the second groove cam 17 in the Z-axis direction and the displacement width of the third groove cam 19 in the Z-axis direction. The shape of the connecting portion 16B can be arbitrarily designed according to the operation characteristic of the blocking portion, and for example, it can be considered to be a curve or a straight line like a spline. The lengths of the first straight portion 16A, the connecting portion 16B, and the second straight portion 16C can also be arbitrarily designed according to the operating characteristics of the blocking portion.

  The drive-side connecting rod 11 is limited in vertical displacement by the upper groove 14A and the lower groove 14B provided in the guide 14, and can move only in the X-axis direction orthogonal to the Y-axis direction serving as the drive shaft of the blocking portion.

  In the guide 14, as shown in FIG. 1, a second groove cam 17 which is equal to the width of the first groove cam 16 in the vertical direction, for example, a curved line is cut. In addition, the shape of the second groove cam 17 is not limited to a curve, and can be appropriately changed according to the cutoff operation characteristic. As shown in FIG. 1, the first grooved cam 16 and the second grooved cam 17 have a laminated structure in the X-axis direction, and the drive-side movable pin 18 is communicated with the overlapping portion of both grooved cams to be movable. It is connected.

  Furthermore, the drive-side movable pin 18 is passed through the third grooved cam 19 cut into the lever 12 and provided on both outer sides in the X-axis direction of the guide 14 within the length of the second grooved cam 17 in the Y-axis direction. The fitting lever 12 is rotated by the cylindrical protrusion fitting hole 12A provided in the lever 12 with the cylindrical protrusion 15 as a rotation axis. At this time, when moving on the connecting portion 16B of the first groove cam, the drive-side movable pin 18 moves while rolling the second groove cam 17 in one direction. A force acts on one side of the inner wall of the third groove cam 19 by the movement of the drive side movable pin 18 in one direction, and the rotation direction of the lever 12 is defined. The shape of the third groove cam 19 is not particularly limited, and can be appropriately changed according to the cutoff operation characteristic. The lever driven side guide hole 21 cut into the lever 12 by this rotational movement transmits a force to the driven side movable pin 20 attached to the driven connection rod 13, whereby the driven side arc electrode 5 is formed. The driven connection rod 13 to be connected is driven in the opposite direction to the drive connection rod 11.

  For example, the coupling between the bi-directional drive mechanism 10 and the drive side electrode is made by attaching the fastening ring 22 to the nozzle 8 and providing the fastening ring 22 with a hole through which the tip of the drive side connecting rod 11 passes. The structure is tightened with a nut.

  As shown in the exploded perspective view of the bidirectional drive mechanism 10 in the present embodiment shown in FIG. 2, two levers 12 of the same shape are attached to the outside of the guide 14. In the operation of the bidirectional drive mechanism portion 10 of the present embodiment, the load acting on the lever 12 is large, and by installing the lever 12 on the outside of the guide 14 with no space restriction, the thickness of the lever 12 and the cylindrical projection 15 The width of the lever 12 and the cylindrical projection 15 and the contact pressure of the cylindrical projection fitting surface 15A can be relieved, and the overall size of the bidirectional drive mechanism 10 can be reduced. Become.

  The drive-side movable pin 18 penetrates the second groove cam 17 in the guide 14, the first groove cam 16 in the drive-side connecting rod 11, and the third groove cam 19 in the lever 12. The drive-side movable pin 18 is not fixed to any part, and can move freely in each groove.

  The driven side movable pin 20 passes through the lever driven side guide hole 21 in the lever 12 and the driven side connecting rod guide groove 30 in the driven side connecting rod 13. At this time, the guide 14 is provided with a hole 25 for moving the driven-side movable pin 20.

  Drive side movable pin 18, drive side movable pin 20, drive side movable pin fastening bolt 26 cut at both ends, driven side movable pin fastening bolt 28, drive side movable pin fixing nut 27, They are respectively tightened by the driven side movable pin fixing nut 29. By arranging the bolt fastening portion on the outside of the easily accessible guide 14, it is possible to improve the maintainability.

  The driven side movable pin 20 passes through the lever driven side guide hole 21 and the driven side connecting rod guide groove 30, but may be a long hole in the lever 12 or a round hole in the driven side connecting rod 13.

  Hereinafter, with reference to FIG. 3 to FIG. 10, the moment acting on the lever 12 at the time of the driving stop of the driven side electrode in the middle of the closing operation from the closing state of the gas circuit breaker to the opening The reduction of the impact load acting on the movable pin 20 and the bending stress generated in the cylindrical projection 15 will be described.

  FIG. 3 is a stroke characteristic diagram of the gas circuit breaker according to the first embodiment in which time is taken on the horizontal axis and drive side electrode stroke and driven side electrode stroke are taken on the vertical axis. For each operation state of the gas circuit breaker, time a is the start time of the shutoff operation as shown in FIG. Also, as described in detail below, time b is shown in FIG. 5, time c is shown in FIG. 6, time d is shown in FIG. 7, and time e is shown in FIG.

  The drive side electrode stroke shown in FIG. 3 constantly varies from the on state to the off state, that is, from time a to time e. On the other hand, the driven side stroke fluctuates only from time b to time e. That is, of the time during which the drive side arc electrode 4 is driven, the driven side arc electrode 5 operates only during the time when the drive side movable pin 18 leaves the connecting portion 16B of the first groove cam. This state is called intermittent drive.

(Time a)
FIG. 4 is a view showing the insertion state according to the first embodiment. The driving side arc electrode 4 and the driven side arc electrode 5 are stationary.

(Time b)
FIG. 5 is a view showing a state immediately before the operation of the driven side arc electrode 5. Although the drive side arc electrode 4 is driven, since the drive side movable pin 18 is located within the range of the first linear portion 16A of the first grooved cam, the driven side arc electrode 5 is stationary.

(Time c)
In FIG. 6, the drive-side movable pin 18 is engaged with the connecting portion 16B of the first groove cam, and immediately after the operation of the driven-side arc electrode 5 starts, that is, the drive-side arc electrode 4 and the driven-side arc electrode 5 are opened. FIG. At this time, the drive-side movable pin 18 simultaneously moves in the second groove cam 17 and the third groove cam 19 in one direction while approaching the connecting portion 16B of the first groove cam 16.

(Time d)
FIG. 7 is a view showing the state of the operation end of the driven side arc electrode 5. At this time, the drive-side movable pin 18 moves in the second groove cam 17 and the third groove cam 19 at the same time when it approaches the second linear portion 16C immediately after leaving the connecting portion 16B of the first groove cam.

(Time e)
FIG. 8 is a diagram showing an open state (cut-off state). The operation of the drive-side arc electrode 4 is completed and reaches the cutoff state, and the drive-side arc electrode 4 and the driven-side arc electrode 5 are stationary.

  The operation of the drive-side movable pin 18 and the lever 12 in FIGS. 4 to 8 will be described. The drive-side movable pin 18 is the first linear portion 16A from the start of the shutoff operation at time a in FIG. And the lever 12 is stationary. In the state of FIG. 6, the drive-side movable pin 18 moves in the connecting portion 16B, and the lever 12 rotates around the cylindrical projection 15. In the state from FIG. 7 to FIG. 8, the drive-side movable pin 18 moves the second linear portion 16C, and the lever 12 is at rest.

  As shown in FIG. 6, when the drive side movable pin 18 moves on the connecting portion 16B, the drive side movable pin 18 moves the second groove cam 17 and the third groove cam 19 in one direction, while the lever 12 is rotated with the cylindrical projection 15 as a fulcrum.

  In the blocking operation which changes in the order of FIGS. 4 to 8, the drive-side movable pin 18 moves the first linear portion 16A, the connecting portion 16B, and the second linear portion 16C in one direction. On the other hand, in the closing operation in the order of FIG. 8 to FIG. 4, the drive-side movable pin 18 moves the second linear portion 16C, the connecting portion 16B, and the first linear portion 16A in one direction.

  As described above, when the drive-side movable pin 18 holds the position of the lever 12 by the second groove cam 17 at the connecting portion 16B of the first groove cam, the lever 12 is rotated in one direction to drive the driven arc electrode 5 Is driven in the direction opposite to the drive side arc electrode 4, and the operation of the drive side movable pin 18 is restricted by the second groove cam 17 and the third groove cam 19 by the second linear portion 16C of the first groove cam 16. , Stop the rotation of the lever 12. Thereby, the intermittent drive state in which the driven side arc electrode 5 stands still is realized.

  Next, with reference to FIG. 9, the moment acting on the lever 12 and the impact load acting on the drive-side movable pin 18 and the driven-side movable pin 20 due to it and the bending stress generated on the cylindrical projection 15 will be described. .

  In this embodiment, as shown in FIG. 1, since the drive-side movable pin 18 and the driven-side movable pin 20 are not fixed to any part, the drive stop time d and closing operation of the driven-side electrode at the time of blocking operation Since the excessive force acting on the drive-side movable pin 18 and the driven-side movable pin 20 can be alleviated in the entire range from the operating time a to the time e except time b, it is possible to realize a highly reliable bidirectional driving mechanism .

  FIG. 9 shows a moment acting on the lever 12 when the driven side electrode of the gas circuit breaker according to the embodiment is stopped and an impact load acting on the driving side movable pin 18 and the driven side movable pin 20 due to the moment. 7 is a schematic view showing bending stress generated in the cylindrical protrusion 15.

  At time d when the shutoff operation is performed, the rotation of the lever 12 is stopped as shown in FIG. 9 with the operation stop of the driven side arc electrode 5, and the lever 12, the drive side movable pin 18 and the driven side movable pin 20 are The impact force F1 and the reaction force R1 are generated by collision of the drive-side movable pin collision point 18B of the drive-side movable pin 18 and the third groove cam collision point 19B of the third groove cam 19 due to the inertial force respectively acting. Similarly, an impact load F2 and a reaction force R2 are generated between the driven side movable pin collision point 20B of the driven side movable pin 20 and the lever driven side guide hole collision point 21B of the lever driven side guide hole 21.

Further, with the operation stop of the driven side arc electrode 5, the lever 12 changes its posture around the Y-axis direction which is geometrically an interruption operation axis due to the fitting tolerance of the cylindrical projection 15 and the cylindrical projection fitting hole 12A. Do. Therefore, when the operation of the driven side arc electrode 5 is stopped, a moment My around the Y-axis direction, which is an interruption operation axis, is generated in the lever 12. The values of the impact load F1, the reaction force R1, the impact load F2 and the reaction force R2 increase due to the posture change of the lever around the Y-axis direction, and the distribution in the X-axis direction is biased. The impact load F1, the reaction force R1, the impact load F2 and the reaction force R2 increase and bias the drive side movable pin collision point 18B, the third groove cam collision point 19B, the driven side movable pin collision point 20B, the lever driven side At the guide hole collision point 21B, the impact load and the reaction force accompanying it locally become excessive, causing surface roughening and scratching due to an increase in contact surface pressure, which causes an operation failure. The cylindrical projection 15 serves as a support for the impact load and the load deviation in the X-axis direction increased by the impact load F1 and the reaction force R1, the impact load F2 and the moment My of the reaction force R2, and the guide 14 and the base of the border are bent Stress σ M is generated.
The impact load F1 and the reaction force R1, the impact load F2 and the reaction force R2, and the moment My and the force σ M are
It occurs at each of the levers 12 at both ends.

  FIG. 10 shows the moment acting on the lever 12 when the driven side electrode of the gas circuit breaker according to the embodiment of the present invention is stopped and the impact acting on the drive side movable pin 18 and the driven side movable pin 20 due to the moment FIG. 5 is a schematic view showing a load and a reduction in bending stress generated in a cylindrical protrusion 15;

  In the configuration of the embodiment of the present invention, when the virtual lever shaft 12B is provided on the lever 12, the drive side movable pin collision point 18B, the third groove cam collision point 19B, the driven side movable pin collision point 20B, the lever driven side The guide hole collision point 21B, the cylindrical protrusion fitting portion surface 15A, and the cylindrical protrusion fitting hole 12A are located on the virtual lever shaft 12B. The cylindrical protrusion fitting portion surface 15A and the cylindrical protrusion fitting hole 12A which cause the lever posture change, the drive side movable pin collision point 18B, the third groove cam collision point 19B, the driven side movable pin collision point 20B, the lever cover By arranging coaxially with the drive side guide hole collision point 21B, it is possible to minimize the increase in the impact load F1, the reaction force R1, the impact load F2 and the reaction force R2 caused by the moment My and the distribution deviation in the X axis direction. It is possible to prevent malfunction due to surface roughening or scratching due to increase and deviation of contact pressure. In addition, it is possible to reduce the bending stress σM generated at the root of the boundary between the guide 14 of the cylindrical projection 15 and the boundary. The sheet thickness can be reduced while securing the structural reliability necessary for securing the reliability of the bidirectional drive mechanism unit 10, and the bidirectional drive mechanism unit 10 can be miniaturized.

  The material constituting the bidirectional drive mechanism unit 10 may be any material, for example, a metal material such as steel or stainless steel, a non-ferrous metal material such as aluminum, or a composite of carbon and glass. In addition, about the components which comprise and contact the bidirectional | two-way drive mechanism part 10, it is more preferable to comprise with a material which has a different value by hardness indicators, such as Vickers. When it is made of materials having equivalent values by hardness index such as Vickers, it is preferable to provide heat treatment such as hardening, surface treatment such as nitriding processing or plating so that the contact surface has different values by hardness index such as Vickers . Moreover, it may be made of a material having different values in hardness index such as Vickers, and surface treatment such as heat treatment, nitriding treatment or plating may be provided.

  The bi-directional drive mechanism 10 is exposed to a corrosive gas environment in which arc extinguishing gas and sulfur hexafluoride gas which is an arc extinguishing gas after decomposition are decomposed and generated by decomposition in the sealed container 100. Be In addition, it is exposed to arc light and high heat during the shutoff operation. Under such an environment, it is preferable to configure the bidirectional drive mechanism unit 10 with a material having heat resistance and corrosion resistance.

  In FIG. 10, the moment acting on the lever when the driven side electrode of the gas circuit breaker is stopped, the impact load acting on the driving side movable pin and the driven side movable pin due to it, and the bending stress generated on the cylindrical projection Is a schematic view showing reduction of As shown in FIG. 10, the bush 40 may be provided between the cylindrical projection fitting surface 15A and the cylindrical projection fitting surface 15A for the fitting of the cylindrical projection 15 and the cylindrical projection fitting hole 12A as shown in FIG. The bush 40 is fixed to the cylindrical projection fitting hole 12A of the lever 12 by press fitting, shrink fitting, cold fitting, bonding or the like. The bush 40 may be any material, for example, a metal material such as steel or stainless steel, a nonferrous metal material such as aluminum, or a composite of carbon and glass. The bush 40 is preferably made of a material having different values in hardness index such as Vickers with respect to constituent materials of the cylindrical projection 15 and the lever 12 in contact with each other. When it is made of materials having equivalent values by hardness index such as Vickers, it is preferable to provide heat treatment such as hardening, surface treatment such as nitriding processing or plating so that the contact surface has different values by hardness index such as Vickers . Moreover, it may be made of a material having different values in hardness index such as Vickers, and surface treatment such as heat treatment, nitriding treatment or plating may be provided.

  As shown in FIG. 11 and FIG. 12, the lever 50 is provided with the bearing 50 between the cylindrical protrusion fitting portion surface 15A and the cylindrical protrusion fitting portion surface 15A with respect to the fitting of the cylindrical protrusion 15 and the cylindrical protrusion fitting hole 12A. Also good. The bearing 50 is fixed to the cylindrical projection fitting hole 12A of the lever 12 by press fitting, shrink fitting, cold fitting, bonding or the like. The bearing 50 may be any type of bearing such as a roller bearing or a ball bearing. The bearing 50 is preferably a radial bearing or an oil-free bearing in consideration of the direction of action of the load and maintainability. The bearing 50 may be any material, for example, a metallic material such as steel or stainless steel, a non-ferrous metallic material such as aluminum, or a composite of carbon and glass. The bearing 50 is preferably made of a material having different values in hardness index such as Vickers with respect to constituent materials of the cylindrical protrusion 15 and the lever 12 in contact. When it is made of materials having equivalent values by hardness index such as Vickers, it is preferable to provide heat treatment such as hardening, surface treatment such as nitriding processing or plating so that the contact surface has different values by hardness index such as Vickers . Moreover, it may be made of a material having different values in hardness index such as Vickers, and surface treatment such as heat treatment, nitriding treatment or plating may be provided.

  The second embodiment will be described with reference to FIG. The bidirectional drive mechanism may be configured to use a bell crank shaped lever 12-2 as in the bidirectional drive mechanism portion 10-2 shown in FIG. In the bidirectional drive mechanism portion 10-2, the third groove cam 19 in the bidirectional drive mechanism portion 10-2 is changed to the lever drive side guide hole 19-2. In the bidirectional drive mechanism section 10, the drive side movable pin 18 and the third groove cam 19 are not fixed, but in the bidirectional drive mechanism section 10-2, the drive side movable pin 18 and the lever drive side guide hole 19- 2 is fit, and the movement of the drive side movable pin 18 is limited. However, the principle of operation is as described using the form of the bidirectional drive mechanism unit 10. The effects of the embodiment of the present invention are also equivalent to the form of the bidirectional drive mechanism unit 10.

  Further, as shown in FIGS. 11 and 12, the lever 12-2 and the cylindrical projection 15-2 may be fitted through the bush 40 or the bearing 50.

  In the present embodiment, for example, the drive side electrode and the driven side electrode are provided opposite to each other in the sealed container 100, the drive side electrode includes the drive side main electrode 2 and the drive side arc electrode 4, and the driven side The electrode has a driven side main electrode 3 and a driven side arc electrode 5, the drive side arc electrode 4 is connected to the operation device 1, and the driven side arc electrode 5 is a bidirectional drive mechanism 10-2. The bidirectional drive mechanism unit 10-2 is connected to a drive side connection rod 11-2 that receives a driving force from the drive side electrode, and a driven side connection rod 13- connected to the driven side arc electrode 5 2 and the lever 12-2 for operating the driven connection rod 13-2 in the opposite direction with respect to the operation of the drive connection rod 11-2 and the rotation center defining the rotation of the lever 12-2. Integrally molding the cylindrical projection 15-2 on the guide 14-2 A guide 14-2 for fitting the lever 12-2 and the guide 14-2 and defining the operation of the drive side connecting rod 11-2 and the driven side connecting rod 13-2, and the drive side connecting rod 11-2 The drive-side movable pin 18 is communicated with each of the first groove cam 16-2 and the second groove cam 17-2 of the lever 12-2, and the drive is performed by the operation of the drive connecting rod 11-2. The side movable pins 18 move in the respective first grooved cams 16-2 and the driven side connecting rod guide grooves 30-2 to rotate the levers 12-2, so that the driven side movable pins 20 can be moved. The driven side in which the driven connection rod 13-2 communicated with the lever 12-2 is driven in the opposite direction to the drive connection rod 11-2 and connected to the driven connection rod 13-2. Arc electrode 5 is in front And the drive side the drive-side arc electrode 4 of the electrode to be connected to the drive coupling rod 11-2 that is driven in the opposite direction may be one of the features.

  The drive-side connecting rod 11-2 is limited in displacement in the vertical direction by the upper groove 14A-2 and the lower groove 14B-2 provided in the guide 14-2, and the X axis direction orthogonal to the Y axis direction serving as the drive shaft of the blocking portion It can only move to

  The drive-side movable pin 18 includes a second grooved cam 17-2 in the guide 14-2, a first grooved cam 16-2 in the drive-side connecting rod 11-2, and a lever drive-side guide in the lever 12-2. It penetrates hole 19-2. The driven side movable pin 20 passes through the lever driven side guide hole 21-2 in the lever 12-2 and the driven side connecting rod guide groove 30-2 in the driven side connecting rod 13-2. At this time, the guide 14-2 is provided with a hole 25-2 for the driven side movable pin 20 to move.

  Drive side movable pin 18, drive side movable pin 20, drive side movable pin fastening bolt 26 cut at both ends, driven side movable pin fastening bolt 28, drive side movable pin fixing nut 27, They are respectively tightened by the driven side movable pin fixing nut 29. By arranging the bolt fastening portion on the outside of the easily accessible guide 14, it is possible to improve the maintainability.

  According to this embodiment, the cylindrical projection fitting portion which generates moment My and causes posture change of lever 12-2 with the stop of the operation of driven side arc electrode 5 at time d in the shutoff operation. The surface 15A-2 and the cylindrical projection fitting hole 12A-2 include the drive side movable pin collision point 18B, the third groove cam collision point 19B, the driven side movable pin collision point 20B, and the lever driven side guide hole collision point 21B. By coaxially arranging, by increasing the impact load F1 and the reaction force R1, the impact load F2 and the reaction force R2 caused by the moment My and the distribution bias in the X-axis direction, the contact surface pressure is increased and biased. It is possible to prevent malfunction due to surface roughening and bending, and reduce bending stress σ M generated at the root of the boundary between the guide 14-2 of the cylindrical projection 15-2 and the reliability of the bidirectional drive mechanism 10-2. While ensuring the essential structural reliability can be downsized bidirectional drive mechanism 10-2.

  The present invention is not limited to the above-described embodiment, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations.

1: Controller 2: Drive-side main electrode 3: Drive-side main electrode 4: Drive-side arc electrode 5: Drive-side arc electrode 6: Shaft 7: Mechanical compression chamber 8: Nozzle 9: Thermal expansion chamber 10: Both Directional drive mechanism 11: drive side connecting rod 12: lever 12A: cylindrical projection fitting hole 12B: virtual lever shaft 13: driven side connecting rod 14: guide 14A: upper groove 14B: lower groove 15: cylindrical projection 15A: cylindrical projection fitting Fitting surface 16: first groove cam 16A: first straight portion 16B: connecting portion 16C: second straight portion 17: second groove cam 18: drive side movable pin 18B: drive side movable pin collision point 19: third groove cam 19B: third groove cam collision point 20: driven side movable pin 20B: driven side movable pin collision point 21: lever driven side guide hole 21B: lever driven side guide hole collision point 22: tightened Ring 23: Drive side fastening bolt 25: Hole 26: Drive side movable pin fastening bolt 27: Drive side movable pin fixing nut 28: Driven side movable pin fastening bolt 29: Driven side movable pin fixing nut 30: Driven side connection Rod guide groove 40: Bushing 50: Bearing 100: Sealed container,
10-2: Bidirectional drive mechanism part 11-2: Drive side connecting rod 12-2: Lever 12A-2: Cylindrical projection fitting hole 13-2: Driven side connection rod 14-2: Guide 14A-2: Upper groove 14B-2: Lower groove 15-2: Cylindrical projection 15A-2: Cylindrical projection fitting surface 16-2: First groove cam 17-2: Second groove cam 19-2: Lever drive side guide hole 21-2: Lever driven side guide hole 25-2: hole 30-2: driven side connecting rod guide groove

Claims (13)

A gas circuit breaker,
A drive side electrode having a drive side main electrode and a drive side arc electrode, connected to the controller, and provided in the sealed tank;
A driven side electrode which has a driven side main electrode and a driven side arc electrode, and is provided in the sealed tank so as to face the drive side electrode;
A bidirectional drive mechanism unit,
Equipped with
The bidirectional drive mechanism is
A drive side connecting rod which receives a driving force from the drive side electrode;
A driven connection rod connected to the driven arc electrode;
A guide for holding the drive side connecting rod and the driven side connecting rod so as to translate the inside;
The guide is disposed on the outer sides of the guide and rotatably fixed to each other by fitting to a cylindrical projection integrally formed with the guide, whereby the driven connection rod and the drive connection rod are connected, and the drive side is connected. A gas circuit breaker comprising two levers for operating the driven connection rod in opposite directions with respect to the movement of the connection rod. In the gas circuit breaker according to claim 1,
A driving side movable pin is communicated with each of the first groove cam of the drive side connecting rod, the second groove cam of the guide, and the third groove cam of the lever, and the cylindrical protrusion is The movable groove is disposed within the longitudinal width of the two groove cam, and a driven movable pin for moving the driven connecting rod is communicated with a position opposite to the driving movable pin with the cylindrical protrusion interposed therebetween. Characteristic gas circuit breaker. In the gas circuit breaker according to claim 1,
A gas circuit breaker characterized in that the lever and the cylindrical projection are fitted through a bush. In the gas circuit breaker according to claim 1,
A gas circuit breaker characterized in that the lever and the cylindrical projection are fitted through a bearing. In the gas circuit breaker according to claim 2,
A gas circuit breaker characterized in that the lever and the cylindrical projection are fitted through the bush. In the gas circuit breaker according to claim 2,
A gas circuit breaker characterized in that the lever and the cylindrical projection are fitted through the bearing. In the gas circuit breaker according to claim 1,
The drive-side movable pin is communicated with the first groove cam of the drive-side connecting rod, the second groove cam of the guide, and the fitting hole of the lever, and the cylindrical protrusion is formed into the second groove A driven side movable pin is disposed which is disposed within the longitudinal width of the cam, the lever has a bell crank shape, and moves the driven connection rod to a position opposite to the drive side movable pin across the cylindrical projection. A gas circuit breaker characterized in that In the gas circuit breaker according to claim 7,
A gas circuit breaker characterized in that the lever and the cylindrical projection are fitted through the bush. In the gas circuit breaker according to claim 7,
A gas circuit breaker characterized in that the lever and the cylindrical projection are fitted through the bearing. In the gas circuit breaker according to claim 2,
The drive side connecting rod is
A first grooved cam including a second straight portion, a connecting portion, and a first straight portion;
A gas circuit breaker characterized in that the first straight portion and the second straight portion are provided on mutually different axes with respect to the driving direction, and a connecting portion is provided therebetween. In the gas circuit breaker according to claim 7,
The drive side connecting rod is
A first grooved cam including a second straight portion, a connecting portion, and a first straight portion;
A gas circuit breaker characterized in that the first straight portion and the second straight portion are provided on mutually different axes with respect to the driving direction, and a connecting portion is provided therebetween. The gas circuit breaker according to claim 10,
The guide is
A second groove cam equal to the groove width of the first groove cam of the drive side connecting rod is cut,
The gas is characterized in that the first grooved cam of the drive side connecting rod and the second grooved cam of the guide form a laminated structure, and a movable pin is disposed at an overlapping portion of both grooved cams and is movably connected to each other. Circuit breaker. In the gas circuit breaker according to claim 1,
A round hole is provided in the lever, an elongated hole is provided in the driven connection rod, or an elongated hole is provided in the lever, and a circular hole is provided in the driven connection rod.
A gas circuit breaker characterized in that a driven side movable pin passes through a hole of the lever and a hole of the driven connection rod.

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