WO2018216084A1

WO2018216084A1 - Switching device

Info

Publication number: WO2018216084A1
Application number: PCT/JP2017/019079
Authority: WO
Inventors: 丸島　敬; 網田　芳明; 正治清水; 晃輔色見
Original assignee: 株式会社東芝
Priority date: 2017-05-22
Filing date: 2017-05-22
Publication date: 2018-11-29
Also published as: WO2018216231A1

Abstract

Provided is a switching device that is more compact, has lower costs, and has excellent disconnection performance and reliability. This switching device switches between disconnecting and connecting current and comprises: an opposing arc contactor 11 and a movable arc contactor 21 that mutually come in contact or separate during disconnection and input and trigger arc discharge during the separation process; an operation rod 25 provided in the movable arc contactor 21 and causing the movable arc contactor 21 to advance towards or retract from the opposing arc contactor 11; and a torsion spring 49 applying an impelling force that causes the opposing arc contactor 11 to retract from the movable arc contactor 21, using the advance/retract of the movable arc contactor 21 caused by the operation rod 25 as a trigger therefor.

Description

Switchgear

Embodiment of this invention is related with the switchgear which switches an electric current interruption | blocking and injection | throwing-up in the substation or switching station of an electric power grid | system.

The switchgear is used when interrupting excessive fault currents, leading small currents, delayed load currents such as reactor shutoffs, or extremely small accident currents that occur in the power system. For example, the switchgear mechanically disconnects the electric circuit in the disconnection process, and extinguishes the arc discharge generated in the disconnection process by blowing arc-extinguishing gas.

As an example of a switchgear, a gas circuit breaker called a puffer type is now widely used. The puffer-type gas circuit breaker is a movable container provided with an opposing contact portion including an opposing arc contact and an opposing energizing contact, and a movable arc contact and a moving energizing contact in a sealed container filled with an arc extinguishing gas. The contact portions are arranged to face each other, and the current is conducted or cut off by contacting or separating the contact portions by a mechanical driving force by the operation rod.

In this switchgear, the volume decreases with the separation of both contact parts, and the pressure accumulating space in which the arc extinguishing gas is accumulated and the arc contacts are disposed so as to surround the arc extinguishing space. Insulating nozzles are provided to guide the sexual gas into the arc. The pressure accumulating space is a combination of a cylinder and a piston, reduces the volume by moving the cylinder closer to the piston in conjunction with the opening of the contact, and accumulates the arc extinguishing gas inside.

In the interruption process, an arc is generated between the arc contacts because the opposed arc contact and the movable arc contact are separated. The cylinder moves in conjunction with the separation of the contact, and the arc extinguishing gas sufficiently accumulated in the accumulator space due to the interaction between the cylinder and the piston is strongly blown to the arc discharge through the insulating nozzle, so that both arcs The insulation performance of the contactor is restored, the arc is extinguished at the current zero point at which the arc discharge becomes small, and the current interruption is completed.

However, if the relative speed between the arc contacts immediately after the current zero point is small, the arc may re-occur and the interruption performance may be significantly reduced. Therefore, a configuration has been proposed in which the relative speed between the arc contacts is increased by moving only one movable arc contact during the opening operation, but moving the other counter arc contact in the opposite direction. Yes.

For example, there has been proposed an opening / closing device that not only transmits drive energy to the movable contact portion but also connects the movable contact portion and the opposed contact portion by a transmission mechanism. According to this switchgear, even if the driving energy is low, both the contact parts can be operated together by transmitting the driving energy to the opposing contact part, and the separation speed can be relatively improved. .

The switchgear using the transmission mechanism is roughly as follows. The first movable electrode portion includes a puffer cylinder, a first arc movable contact, and an insulating nozzle, and is connected to a drive mechanism via an insulating operation rod. On the other hand, the second movable electrode portion includes a second movable arc contact at the center and a cylindrical fixed energizing contact provided outside the second movable arc contact. The second movable arc contact is in contact with the first arc contact in the closing state, and is connected to the insulating nozzle via a connection lever and a connection rod that are rotatably supported by a guide whose position is fixed. It is driven in the opposite direction to the operation of one moving arc contact.

Also, a spring operating mechanism is often selected as a power source for the switchgear. This is because the spring operation mechanism is excellent in maintainability and reliability. However, the spring operating mechanism may have disadvantages such as a higher manufacturing cost and a larger body size when driving energy is higher than the hydraulic operating mechanism. Therefore, in order to realize high-speed operation of the movable contact portion, it is essential to reduce the size and weight of the movable contact portion.

Japanese Patent Publication No. 7-109744 JP 2012-28106 A

In an opening / closing device that moves both the movable contact portion and the opposed contact portion by the transmission mechanism, a part of the drive energy of the drive device that drives the movable contact portion is transmitted to the opposed contact portion for driving. Used for. Therefore, in order to improve the opening speed of the movable contact portion and the opposed contact portion, it is necessary to increase the drive energy of the drive device, and the drive device becomes larger or complicated and the reliability decreases. However, there is a problem that the manufacturing cost increases.

The problem to be solved by the present invention is to provide a switchgear that is compact and low-cost and that has excellent shut-off performance and reliability.

In order to achieve the above object, the switchgear according to this embodiment is a switchgear that switches between interruption and application of current, and contacts or separates from each other at the time of interruption or application, and arc discharge occurs in the separation process. Arcing counter arc contact and movable arc contact, an operating rod provided on the movable arc contact for moving the movable arc contact back and forth with respect to the counter arc contact, and the movable arc contact by the operating rod And an urging body for applying an urging force for retreating the opposed arc contact with respect to the movable arc contact upon the advancement and retreat of the child.

It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows an electric current input state. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows an electric current interruption state. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows the state in the middle of electric current interruption operation | movement. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows the state following the state of FIG. 3 in the middle of electric current interruption operation | movement. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows the state following the state of FIG. 4 in the middle of electric current interruption operation | movement. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows the state following the state of FIG. 5 in the middle of electric current interruption operation | movement. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows the state in the middle of electric current addition operation | movement. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows the state following the state of FIG. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows the state following the state of FIG. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows the state following the state of FIG. 9 in the middle of electric current injection operation | movement. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows the detail of the state of FIG. 4 in the middle of electric current interruption operation | movement. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows the detail of the state of FIG. 9 in the middle of electric current interruption operation | movement. It is sectional drawing which shows the whole structure of the switchgear which concerns on 1st Embodiment, and shows the detail of the state of FIG. 10 in the middle of electric current interruption operation | movement. It is sectional drawing which shows the whole structure of the switchgear which concerns on 2nd Embodiment. It is sectional drawing which shows the whole structure of the switchgear which concerns on 3rd Embodiment. In 3rd Embodiment, it is sectional drawing orthogonal to the plane of a rotation lever, and shows the rotation lever vicinity. It is sectional drawing of the spiral spring provided in the rotating shaft of the rotating lever, and is sectional drawing orthogonal to the rotating shaft of a rotating lever. It is sectional drawing which shows the whole structure of the switchgear which concerns on 4th Embodiment. In 4th Embodiment, it is sectional drawing orthogonal to the plane of a rotation lever, and shows the rotation lever vicinity. It is sectional drawing which shows the whole structure of the switchgear which concerns on 5th Embodiment. It is sectional drawing which shows the whole structure of the switchgear which concerns on 6th Embodiment.

[1. First Embodiment]
[1-1. Schematic configuration]
The switchgear according to the present embodiment is a switchgear that switches between interruption and input of current. As shown in FIGS. 1 and 2, the opening / closing device includes a sealed container 2 filled with an arc extinguishing gas, and an opposing contact portion 10 and a movable contact portion 20 disposed to face each other in the sealed container 2. Gas circuit breaker. This gas circuit breaker switches between turning on and off the current by contacting and separating the opposed contact portion 10 and the movable contact portion 20.

In the current interruption process, an arc discharge is generated between the opposed contact portion 10 and the movable contact portion 20. The switchgear includes a puffer type gas flow generating means for accumulating arc extinguishing gas to generate a gas flow, and the gas flow is blown against the arc discharge to cut off at a current zero point.

The opposed contact portion 10 and the movable contact portion 20 are each composed of a plurality of members having a basic shape of a cylinder or a column, and have a common axis. Hereinafter, in order to explain the positional relationship and direction of each member, in one

contact portion

10, 20, the direction on the side facing the

other contact portion

20, 10 is referred to as the front or tip, and the opposite direction Is referred to as the rear or rear end.

The opposing contact portion 10 includes an opposing arc contact 11 and an opposing energizing contact 12. The movable contact portion 20 includes a movable arc contact 21 and a movable energizing contact 22. In the sealed container 2, the current-carrying

contacts

12, 22 are opposed to each other, and switching on / off of current is switched by their contact / separation. The

arc contacts

11 and 21 are opposed to each other, and the arc discharge is assumed between the

arc contacts

11 and 12 due to the separation.

The movable contact portion 20 advances and retreats along the common axis with respect to the opposing contact portion 10. In other words, the movable contact portion 20 includes an operation rod 25 that moves along a common axis by an operation force of a drive device (not shown), and moves forward or backward in conjunction with pushing and pulling of the operation rod 25.

The opposed contact portion 10 has an energization support portion 14 fixed in the sealed container 2, and the opposed energization contact portion 12 is fixed to the energization support portion 14. Therefore, the position of the opposed energizing contact 12 is immobile in the sealed container 2.

On the other hand, the counter arc contact 11 is provided so as to be movable along a common axis. That is, the opening / closing device includes an auxiliary biasing body that applies a biasing force that causes the counter arc contact 11 to move backward with respect to the movable arc contact 21 when the movable arc contact 21 is advanced or retracted by the operation rod 25, and the movable arc contact. A transmission mechanism for releasing or accumulating the urging force of the auxiliary urging body in conjunction with the advance and retreat of the child 21; Here, the auxiliary biasing body is a torsion spring 49. In the current interruption process, the switchgear obtains drive energy from the drive device and the operating rod 25 causes the movable contact portion 20 to move backward with respect to the opposing contact portion 10, and in conjunction with the movement of the operation rod 25, The biasing force of the biased torsion spring 49 is released by the transmission mechanism, and the counter arc contact 11 is moved backward with respect to the movable arc contact 21. Thereby, both the

arc contacts

11 and 21 move with respect to the other and are separated.

[1-2. Detailed configuration]
Below, each structure of this opening / closing apparatus is demonstrated in detail.

The hermetic container 2 is made of metal, insulator or the like and is grounded. The arc extinguishing gas is, for example, sulfur hexafluoride gas (SF ₆ gas), air, carbon dioxide, oxygen, nitrogen, or a mixed gas of two or more of these, and other gases excellent in arc extinguishing performance and insulation performance. is there. Desirably, the arc-extinguishing gas is a single gas or a mixed gas of a gas having a lower global warming potential and a lower molecular weight than sulfur hexafluoride gas and having a gas phase of at least 1 atm or more and 20 degrees centigrade or less. is there.

The opposed contact portion 10 and the movable contact portion 20 are a composite body having a basic shape of an internal hollow cylinder or a solid column, and all the members have a concentric arrangement having a common central axis, By matching the diameters, the related members face each other and function cooperatively.

The opposing energizing contact 12 and the energizing support portion 14 are conductors having a cylindrical shape with substantially the same diameter. The energization support portion 14 has a cup shape with a hole at the bottom, is fixed to the position within the hermetic container 2 behind the counter energization contact 12 with the bottom facing forward, and the rear end of the counter energization contact 12 Is fixed to the energization support portion 14 with the same diameter. The opposed energizing contact 12 and the energization support portion 14 are electrically connected. The opening edge of the opposite energizing contact 12 on the side of the movable contact portion 20 bulges inward. An opening through which the counter arc contact 11 is inserted is provided at the center of the bottom of the energization support portion 14.

The opposed arc contact 11 is disposed in the energization support portion 14 so as to freely advance and retract. That is, the counter arc contact 11 is a rod-shaped conductor having a rounded tip, is disposed inside the counter energization contact 12, has a common axis with the energization support portion 14, and the energization support portion 14. Is inserted through the opening. The outer diameter of the opposed arc contact 11 is substantially the same as the opening of the energization support portion 14. The term “substantially the same” refers to a range in which the opposed arc contact 11 does not wobble during advance and retreat and can slide in the opening of the energization support portion 14.

A conductive sliding body 13 is embedded in the opening of the energization support portion 14. The conductive sliding body 13 is a conductor having a cylindrical shape, and electrically connects the energization support portion 14 and the counter arc contactor 11. Further, the inner surface of the conductive sliding body 13 is configured to reduce the coefficient of friction with the counter arc contact 11 or to be elastically deformed with respect to the displacement of the counter arc contact 11. As the conductive sliding body 13, for example, a multilam band made of a metal material can be used.

The movable energizing contact 22 is a conductor having a cylindrical shape with an open end. The movable energizing contact 22 is erected on the middle bottom portion of a cylinder 24 described later toward the opposing energizing contact 12. The outer diameter of the movable energizing contact 22 coincides with the inner diameter of the opening edge portion that bulges inside the opposing energizing contact 11. When the movable energizing contact 22 is inserted into the opening of the opposed energizing contact 11, the inner surface of the opposed energizing contact 11 and the outer surface of the movable energizing contact 22 are brought into electrical connection.

The movable arc contactor 21 is a conductor having a hollow cylindrical shape that is open at both ends. The opening edge at the tip of the movable arc contact 21 bulges inward, and the inner diameter of the opening edge coincides with the outer diameter of the opposed arc contact 11. The movable arc contact 21 is fixed to the operation rod 25, and is moved toward and away from the opposed arc contact 12 in conjunction with the operation rod 25, so that the opposed arc contact 12 is inserted into the opening of the movable arc contact 21. Thus, the movable arc contact 21 and the counter arc contact 12 are brought into conduction.

In addition, the tip of the movable arc contact 21 may be formed as a finger electrode by being divided in the circumferential direction. The movable arc contact 21 has flexibility, and the inner diameter of the opening edge of the movable arc contact 21 is slightly smaller than the outer diameter of the opposed arc contact 12.

The operating rod 25 is a hollow cylinder with an open end to which the movable arc contact 21 is fixed, and is located in the innermost shell as the core of the movable contact portion 20. The rear end of the operation rod 25 is connected to the drive device via a solid insulating rod (not shown), and is pushed forward or pulled backward along the common axis. The movable arc contact 21 and the operation rod 25 have the same diameter, and the movable arc contact 21 is erected with its peripheral edge aligned with the opening edge of the operation rod 25.

The gas flow generating means includes a mechanical puffer chamber 31 that mechanically compresses the arc extinguishing gas and an insulating nozzle 23 that guides the mechanically compressed arc extinguishing gas to arc discharge. The volume of the mechanical puffer chamber 31 is variable in conjunction with the movement of the operation rod 25, the volume decreases in the process of interrupting the current, and arc extinguishing gas is released to the outside as the internal space accumulates pressure.

The machine puffer chamber 31 is a space defined by the cylinder 24 and the piston 27. The cylinder 24 is a cylindrical conductor having one end with a bottom and the other end opened. The bottomed portion of the cylinder 24 is flush with the distal end of the operation rod 25 and is connected to the operation rod 25 so as to be connected to the proximal end of the movable arc contact 21 and moves together with the operation rod 25. The cylinder 24 has an inner diameter larger than the outer diameter of the operation rod 25 and has a common central axis with the operation rod 25. The bottomed portion has a disk shape, extends from the outer periphery of the tip of the operation rod 25 in a flange shape, and the side peripheral wall surrounding the bottomed portion extends in the opposite direction to the opposed contact portion 10.

The piston 27 is a donut-shaped flat plate. The operating rod 25 slidably penetrates through the opening of the piston 27, the outer diameter of the piston 27 matches the inner diameter of the cylinder 24, and the piston 27 is fitted into the cylinder 24. The piston 27 is formed integrally with the piston support 28. The piston support 28 is a cylinder extending from the piston 27 in the opposite direction to the opposed contact portion 10, is located on the outer shell side from the operation rod 25, and is fixed so as not to move in the sealed container 2.

The bottom of the cylinder 24 is provided with a discharge port 24a that communicates between the hollow portion of the cylinder 24 and the outside around the movable arc contact 21 so that the mechanical puffer chamber 31 and the outdoor space thereof are opposed to each other by an opposing arc. They are connected on the contact 12 side.

When the cylinder 24 is retracted along with the retracting operation rod 25, the volume of the mechanical puffer chamber 31 is reduced, the arc extinguishing gas inside is accumulated, and a gas flow is generated. This gas flow is discharged to the outside through the discharge port 24a.

The insulating nozzle 23 is a hollow cylinder erected on the surface of the bottomed portion of the cylinder 24 on the counter arc contact 11 side. The insulating nozzle 23 surrounds the discharge port 24a with the mechanical puffer chamber 31, and extends along the central axis toward the counter arc contact 11 while containing the movable arc contact 21 at a predetermined interval.

The insulating nozzle 23 can be a Laval nozzle, for example. That is, after passing through the tip of the movable arc contact 21, the insulating nozzle 23 is narrowed to an extent where the inner diameter is slightly larger than the outer diameter of the opposed arc contact 11, and reaches the throat portion that becomes the minimum inner diameter portion. It can be set as the shape which expands linearly toward.

In this embodiment, a long plate-like link 45 is connected to the rear end of the opposed arc contact 11. One end of the link 45 is rotatably provided at the rear end of the counter arc contact 11. At the rear end of the link 45, there is provided a rotation lever 46 that is fixedly installed in the sealed container 2. The rotation lever 46 is fixed so that its rotation shaft 46a does not move in the sealed container 2, and is provided to be rotatable around the rotation shaft 46a.

Rollers

47 and 48 are provided at both ends of the rotation lever 46.

The auxiliary biasing body of this embodiment is a torsion spring 49. The torsion spring 49 applies a biasing force to the rotation lever 46 and rotates the rotation lever 46 in one direction. The turning direction in which the torsion spring 49 is biased is a direction in which the counter arc contact 11 is retracted. That is, the torsion spring 49 gives driving energy to the counter arc contact 11 and assists in driving the counter arc contact 11.

The torsion spring 49 has an annular portion and a pair of arms extending in the opposite direction from the annular portion, and the annular portion is fitted to the rotating shaft 46a. A fixed point pin 50 that is orthogonal to the common axis and parallel to the rotation shaft 46 a is fixed to the energization support portion 14. Further, on the flat surface 46b of the rotation lever 46, an action point pin 51 that is orthogonal to the common axis and parallel to the rotation axis 46a is provided. The action point pin 51 is provided on the roller 47 side rather than the roller 48 side. The torsion spring 49 has one arm hooked to the fixed point pin 50 and the other arm hooked to the action point pin 51. The angle formed by the pair of arms is narrower than the free angle, which is the angle when no load is applied, and the torsion spring 49 always biases the rotating lever 46 in one direction so as to widen the opening angle of the arm. give. That is, one arm is in contact with the front side of the fixed point pin 50, and the other arm is on the front side of the action point pin 51 so as to apply a biasing force to the rotary lever 46 so that the link 45 moves rearward. Abut.

In the present embodiment, the link 45, the rotation lever 46, the

rollers

47 and 48, and the torsion spring 49 constitute the auxiliary drive device 40 that drives the counter arc contactor 11.

The application of the urging force for retracting the opposed arc contact 11 to the movable arc contact 21 of the torsion spring 49 is triggered by the advance / retreat of the movable arc contact 21 by the operating rod 25, and the interlock is realized by a transmission mechanism. Is done.

That is, the transmission mechanism includes

guide rails

41 and 42 interlocking with the movable contact portion 20,

protrusions

43 and 44 provided on the guide rails 41 and 42, and a cup that connects the guide rails 41 and 42 to the insulating nozzle 23. A ring 32.

The guide rails 41 and 42 are fixed relative to the movable arc contact 21 via the coupling 32 and the insulating nozzle 23, and are pushed forward in conjunction with the movement of the operation rod 25, or backward. Be drawn. The guide rails 41 and 42 are, for example, long plate-like members that extend along a common axis, and do not interfere with the bottomed portion of the energization support portion 14 when moving forward and backward in conjunction with the operation rod 25.

The protrusion 43 bulges inside the guide rail 41 and has a round continuous surface. On this surface, the protrusion 43 is in contact with the roller 47 in the input state, and holds the urging force of the auxiliary urging body. In addition, at the initial stage of shut-off, the contact state is released, and the biasing force of the auxiliary biasing body is released. In other words, the protrusion 43 contacts the roller 47 to lock the rotation of the rotation lever 46 by the auxiliary biasing body.

The protrusion 44 bulges inside the guide rail 42 and has a round continuous surface. On this surface, the protrusion 44 contacts the roller 48 during the charging process, and accumulates the auxiliary biasing body. The projecting portion 43 is provided on the front side, the projecting portion 44 is provided on the rear side, and the projecting

portions

43 and 44 are disposed at positions where the above-described contact or release is performed.

The opening / closing device also includes a rotation restricting device 70 that restricts the rotation of the rotation lever 46. That is, the rotation restricting device 70 is provided behind the rotation lever 46, and the contact state of the protrusion 43 is released, and the rotation restricting device 70 rotates in a direction in which the counter arc contact 11 is moved backward with respect to the movable arc contact 21. By contacting a roller 47 provided on the rotation lever 46, the rotation of the rotation lever 46 is restricted. Here, the rotation restricting device 70 includes a piston 71 that abuts on the roller 47, an elastic body 72 that gives the piston 71 an urging force that attenuates the retraction speed of the opposed arc contactor 11, and a guide 80. The guide 80 has, for example, a disk shape, and is fixed to the rear end edge of the energization support portion 14. The piston 71 has a flat tip and is provided with a leg extending rearward from the flat plate along a common axis. The leg is inserted through an opening provided in the center of the guide 80. The leg penetrates the guide 80, the end of the leg bulges larger than the opening, and the piston 71 is configured not to come off. Here, the elastic body 72 is a spring and is disposed between the guide 80 and the flat plate of the piston 71. That is, when the roller 47 comes into contact with the piston 71, the elastic body 72 contracts, the rotation of the rotating lever 46 is restricted, and the retreating speed of the counter arc contact 11 is attenuated.

The guide 80 is provided with an opening through which the guide rails 41 and 42 are slidably inserted. In the opening, for example, a cylindrical sliding smooth body 81 is embedded, and the inner surface of the sliding smooth body 81 reduces the coefficient of friction with the guide rails 41 and 42 or against the displacement of the guide rails 41 and 42. And elastically deformable. As the sliding smoothing body 81, for example, a resin bush such as Teflon (registered trademark), polyester, nylon, or a linear bush incorporating a plurality of balls can be used.

[1-3. Action]
(Loading state)
In the switchgear configured as described above, in the energized state of the switchgear shown in FIG. 1, that is, in the turned-on state, the movable contact 20 is pushed by the operating rod 25 by the drive device, and the opposed contact It is pushed in the direction and its position is held. Further, the opposed arc contactor 11 locks the rotation of the rotating lever 46 by the urging force of the torsion spring 49 by the contact between the protrusion 43 and the roller 47, and the position thereof is maintained.

The torsion spring 49 is shrunk until the opening angle between the arms becomes an acute angle by the rotational movement of the action point pin 51 forward, and the energy is increased in the direction of widening the opening angle, that is, in the direction of rotating the roller 47 of the rotating lever 46 backward. Has accumulated.

At this time, both the opposed contact portion 10 and the movable contact portion 20 are close to each other, the opposed energized contact 12 and the movable energized contact 22 are in contact, and the opposed arc contact 12 and the movable arc contact 21 are in contact. Are in contact. As a result, the switchgear is energized.

In this energized state, the energizing support portion 14, the opposed energizing contact 12, the movable energizing contact 22, and the cylinder 24 are electrically connected to form a single electric circuit. Although not particularly illustrated, in the sealed container 2, two conductors are fixed to the opposing contact portion 10 side and the movable contact portion 20 side by spacers. The spacer insulates the sealed container 2 from the conductor and supports the conductor. The current flows into the gas circuit breaker through the bushing, and flows out of the gas circuit breaker from the conductor on the opposing contact portion 10 side through the electric path and the conductor on the movable contact portion 20 side and the bushing.

(Blocking state)
Further, in the shut-off state of the opening / closing device shown in FIG. 2, the movable contact portion 20 is pulled in the opposite direction to the opposed contact portion 10 by the pulling of the operation rod 25 by the driving device, and the position is maintained. Further, the opposed arc contactor 11 locks the rotation of the rotating lever 46 by the biasing force of the torsion spring 49 by the contact between the roller 47 of the rotating lever 46 and the piston 71 of the rotation restricting device 70, and the position is maintained. Has been.

At this time, both the opposing contact portion 10 and the movable contact portion 20 are electrically separated sufficiently, and the current is cut off.

(Blocking operation)
The shut-off operation of the opening / closing device will be described in the time series of FIGS.

In the closing state shown in FIG. 1, when receiving an interruption signal from the outside and interrupting an accident current or the like, as shown in FIG. 3, the switchgear receives the operation force of the drive device and the common shaft Move backwards along. As a result, the movable contact portion 20 moves rearward so as to be dragged by the operation rod 25 and away from the opposing contact portion 10. Since the guide rail 41 is connected to the movable contact portion 20 by the coupling 32, the guide rail 41 moves while elastically deforming the sliding smooth body 81 in conjunction with the movable contact portion 20. At this time, the roller 47 moves on the surface of the protrusion 43 while maintaining a state in contact with the protrusion 43, so that the rotation lever 46 rotates in the direction in which the torsion spring 49 is stored (clockwise in FIG. 3). To do. Then, the rotating lever 46 is rotated by the protrusion 43 until the angle between the arms at which the torsion spring 49 can store energy to the maximum is minimized.

Further, the movable contact portion 20 moves rearward, and as shown in FIG. 4, the roller 47 of the rotation lever 46 rotates to the rotation regulating device 70 side (counterclockwise in FIG. 4), and the roller 47 becomes the projection 43. If the tip of the roller 47 is exceeded, the contact state between the roller 47 and the protrusion 43 is released, the roller 47 is separated from the protrusion 43, and the biasing force of the torsion spring 49 that has been locked is released. As a result, the rotation lever 46 starts to rotate in the direction of the biasing force of the torsion spring 49, and accordingly, the opposed arc contact 11 is rearwardly separated from the movable contact 20 while elastically deforming the conductive slide 13. Move to.

As a result, the opposed energizing contact 12 and the movable energizing contact 22 are separated from each other, then the opposed arc contact 11 and the movable arc contact 21 are separated from each other, and the opposed arc contact 11 and the movable arc contact 21 are separated from each other. Arc discharge is generated in the meantime.

As shown in FIG. 5, the rotating lever 46 that rotates by the urging force of the torsion spring 49 rotates until the roller 47 comes into contact with the piston 71, and stops when the roller 47 comes into contact with the piston 71. The impact generated by the contact is absorbed by elastic deformation of the elastic body 72 of the rotation restricting device 70. Therefore, the impact force with respect to each component in the airtight container 2 including the rotation lever 46 is relieved.

When the movable contact portion 20 further moves, the distance between the opposed arc contact 11 and the movable arc contact 21 is sufficiently opened, and when the mechanical puffer chamber 31 is sufficiently accumulated, the arc extinguishing gas in the mechanical puffer chamber 31 is released. It ejects into the insulating nozzle 23 through the outlet 24a. The arc extinguishing gas that has become a jet is guided toward the arc discharge using the gas flow path between the insulating nozzle 23 and the movable arc contact 21 and is strongly blown to the arc discharge.

Further, as shown in FIG. 6, the guide rail 42 also moves in conjunction with the movable contact portion 20, so that the projection 44 contacts the roller 48, and the roller 48 faces the tip of the projection 44 and its surface. By sliding upward, the rotation lever 46 rotates in the direction in which the torsion spring 49 is urged. Further, as the rotation lever 46 rotates, the roller 47 pushes the piston 71, and the elastic body 72 contracts.

When the movable contact portion 20 further moves, the roller 48 moves backward beyond the tip of the protrusion 44, so that the contact state between the roller 48 and the protrusion 44 is released, and the biasing force of the elastic body 72 The piston 71 is pushed forward. Therefore, the rotation lever 46 rotates in the direction in which the torsion spring 49 is urged via the roller 47, and the counter arc contact 11 is finally held at the position shown in FIG.

Then, when the arc discharge reaches the current zero point, the arc discharge is extinguished in combination with the injection of the strong arc-extinguishing gas, and the current interruption of the gas circuit breaker is completed.

(Loading operation)
Next, the closing operation of the switchgear will be described in time series with reference to FIG. 2, FIG. 7 to FIG. 10, and FIG.

In the shut-off state shown in FIG. 2, when the closing signal is received from the outside and is turned on, the opening / closing device receives the operating force of the driving device, and the operating rod 25 follows the common axis as shown in FIG. Move forward. As a result, the movable contact portion 20 moves forward so as to be pushed into the operating rod 25 and approach the opposing contact portion 10. Since the guide rail 42 is connected to the movable contact portion 20 by the coupling 32, the guide rail 42 moves while elastically deforming the sliding smooth body 81 in conjunction with the movable contact portion 20. As a result, the roller 48 comes into contact with the protrusion 44.

Here, the rotation center 46 c of the rotation lever 46 is displaced forward from the straight line X passing through the rotation center 48 a of the roller 48 from the contact position between the protrusion 44 and the roller 48. A rotational force in the direction of accumulating the torsion spring 49 (clockwise in FIG. 7) is applied. Therefore, as shown in FIG. 8, when the movable contact portion 20 further moves, the rotation lever 46 rotates in a direction in which the torsion spring 49 is stored.

When the movable contact portion 20 further moves, as shown in FIG. 9, the movable energizing contact 22 and the opposing energizing contact 12 come into contact, and the movable arc contact 21 and the opposing arc contact 11 come into contact. Thereby, the switchgear is turned on.

Also, when the roller 48 slides on the surface of the protrusion 44 and exceeds the tip of the protrusion 44, the contact state is released and the roller 48 is separated from the protrusion 44. As a result, the lock of the torsion spring 49 is released, so that the rotation lever 46 starts to rotate in the direction of the urging force of the torsion spring 49, and the roller 47 comes into contact with the protrusion 43 as shown in FIG.

At this time, the rotation center 46c of the rotation lever 46 is displaced rearward from the straight line Y passing through the rotation center 47a of the roller 47 from the contact position between the protrusion 43 and the roller 47. A rotational force in the direction of accumulating the torsion spring 49 is applied. Therefore, when the movable contact portion 20 further moves, the rotation lever 46 once rotates in the direction in which the torsion spring 49 is stored, and the roller 47 moves beyond the tip of the protrusion 43 to the front surface. Therefore, when the roller 47 comes into contact with the protrusion 43, the rotation of the rotating lever 46 in the direction in which the urging force of the torsion spring 49 is released is locked. Finally, the counter arc contactor 11 is held at the position of the closing state shown in FIG. 1 in a state where the urging force of the torsion spring 49 is accumulated.

(Example of operation realization)
In order to realize the above-described blocking operation and closing operation, the distance in the common axis direction between the protrusion 43 and the protrusion 44 needs to satisfy the following two conditions.

Condition 1: Immediately after the contact between the projection 43 and the roller 47 at the start of the blocking operation is released, the rotation lever 46 is not rotated in the direction of accumulating the torsion spring 49 due to the contact between the projection 44 and the roller 48. .

Condition 2: Contact between the projection 44 and the roller 48 in the latter half of the closing operation is released, the rotation lever 46 rotates in the direction in which the torsion spring 49 is urged, and immediately after the roller 47 and the projection 43 come into contact, the torsion spring 49 The rotating lever 46 is not rotated in the direction of biasing.

Specific examples will be described with reference to FIGS. Here, the protrusion 43 and the tip of the protrusion 44 are formed as arcs, and the surface of the protrusion 44 on the movable contact portion 20 side is in a direction perpendicular to the common axis. Furthermore, during operation, the roller 47 and the roller 48 are assumed to move without bouncing the arc portions of the protrusion 43 and the protrusion 44, respectively.

11 is a partial enlarged view of the vicinity of the rotary lever 46 of FIG. 4 immediately after the shut-off operation, FIG. 12 is FIG. 9 of the latter half of the closing operation, and FIG. ing.

In FIG. 11, the distance from the rotation center 46c of the rotation lever 46 to the rotation center 47a of the roller 47 is A1, the distance from the rotation center 46c of the rotation lever 46 to the rotation center 48a of the roller 48 is A2, and the radius of the roller 47 is R. _R1 , the radius of the roller 48 is R _R2 , the radius of the arc of the protrusion 43 is R _m1 , the radius of the arc of the protrusion 44 is R _m2 , from the rotation center 46c of the rotation lever 46 to the center of the arc of the protrusion 43 The distance perpendicular to the common axis is H1, and the distance perpendicular to the common axis from the rotation center 46c of the rotation lever 46 to the center of the arc part of the protrusion 44 is H2. The angle θ1 formed by the rotary lever 46 is expressed by the following formula (1).
(Equation 1)

At this time, the condition that the roller 48 does not come into contact with the protruding portion 44 is expressed by the equation (2). The distance L in the common axis direction needs to satisfy the formula (2).
(Equation 2)

When formula (2) is formally transformed, formula (3) is obtained.
(Equation 3)

In FIG. 12, the angle θ2 formed by the right angle direction of the common axis and the rotation lever 46 is expressed by the following formula (4). The axial distance “a” is expressed by Equation (5).
(Equation 4)

(Equation 5)

Further, in FIG. 13, the positions of the protrusion 43, the protrusion 44, and the rotation center 46 c of the rotation lever 46 are equal to those in FIG. 12, the rotation lever 46 rotates, and the roller 47 contacts the protrusion 43. When the distance between the rotation center 46c of the rotation lever 46 and the protrusion 43 is b, in order to satisfy the above condition 2, it is necessary to satisfy Expression (6).
(Equation 6)

Here, since the equation (7) is established by the three square theorem, the distance L needs to satisfy the equation (8) in order to satisfy the above condition 2.
(Equation 7)

(Equation 8)

Therefore, in order to satisfy the conditions 1 and 2 simultaneously, it is necessary to satisfy the expressions (3) and (8) simultaneously.

As described above, the conditions for satisfying the blocking operation and the closing operation have been described. However, this is only an example, and when the shape of the

protrusions

43 and 44 is not an arc or when the

rollers

47 and 48 bounce the

protrusions

43 and 44. Even if it exists, if the counter-arc contactor 11 is moved away from the movable arc contactor 21 by the auxiliary biasing member in the interruption process, the arrangement of the

protrusions

43 and 44 is expressed by the equations (3) and (8). It is not limited to.

[1-4. effect]
(1) The switchgear according to the present embodiment is a switchgear that switches between interruption and application of current, and is opposed to or separated from each other at the time of interruption or application, and the opposed arc contact that generates arc discharge in the separation process 11, the movable arc contact 21, and the movable arc contact 21, which is provided on the movable arc contact 21, moves the movable arc contact 21 forward and backward relative to the counter arc contact 11, and the movable arc contact 21 is advanced and retracted by the operation rod 25. And a torsion spring 49 for applying a biasing force to retract the counter arc contact 11 relative to the movable arc contact 21.

Thereby, the opposed arc contact 11 and the movable arc contact 21 can be relatively separated with a relatively simple structure without increasing the drive energy of the drive device. As a result, it is possible to obtain a switchgear that is compact and low-cost and that has excellent shut-off performance and reliability.

That is, as in the prior art, a part of the driving energy of the drive device is not retracted from the movable arc contact 21 by a conventional transmission mechanism or the like, but the torsion provided as an auxiliary biasing body. Since the spring 49 independently retracts the counter arc contact 11, there is no need to increase the driving energy of the driving device. Therefore, there is no increase in cost for increasing the size of the driving device or increasing the driving energy, and the breaking speed between the

arc contacts

11 and 21 can be increased. The improvement in the breaking speed improves the breaking performance, and the improvement in the breaking speed can be realized with a relatively simple structure of the torsion spring 49, so that the operation reliability can be improved.

(2) A transmission mechanism for releasing or accumulating the urging force of the torsion spring 49 in conjunction with the advance and retreat of the movable arc contactor 21 is provided. Specifically, the transmission mechanism includes a link 45 that is rotatably connected to the rear end of the counter arc contact 11, a rotation lever 46 that is connected to the link 45, and rotates according to the push / pull of the link 45, A roller 47 rotatably provided at one end of the rotation lever 46, a guide rail 41 fixed to the movable arc contact 21, and a contact state with the roller 47 provided in the guide rail 41 in the process of interruption And a projection 43 that releases the urging force of the torsion spring 49, and the torsion spring 49 rotates so that the counter arc contact 11 is driven in a direction opposite to the advance and retreat of the movable arc contact 21. An urging force is applied to the lever 46.

Thereby, the movement of the counter arc contact 11 can be synchronized with the movement of the movable contact portion 20, and the relative separation speed between the counter arc contact 11 and the movable arc contact 21 can be improved. Can do.

(3) A roller 48 provided rotatably at the other end of the rotation lever 46 and a protrusion 44 provided on the guide rail 42 and energizing the torsion spring 49 during the charging process. Thereby, it is possible to prepare for the counter arc contactor 11 to move backward with respect to the movable arc contactor 21 by the torsion spring 49 in the subsequent interruption process.

(4) The torsion spring 49 has a pair of arms, one arm is fixed in the opening / closing device, and the other arm is connected to the rotation lever 46. Thereby, the urging force of the torsion spring 49 can be transmitted to the rotating lever 46 and converted into the rotating force.

[2. Second Embodiment]
A second embodiment will be described with reference to FIG. The second embodiment is the same as the basic configuration of the first embodiment. In the following, only differences from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 14 is a cross-sectional view showing the overall configuration of the switchgear according to the second embodiment. As shown in FIG. 14, in the second embodiment, the auxiliary biasing body is a tension spring 91. The tension spring 91 is a spring that is stored by being pulled so as to be longer than the natural length and is restored by a restoring force when released. The fixed point pin 50 is provided behind the rotation lever 46, and is provided between the guide 80 and the piston 71 here.

One end of the tension spring 91 is hooked and fixed to the fixed point pin 50, and the other end is hooked to the working point pin 51 and fixed.

In this switchgear, the operation of the rotating lever 46 is the same as that of the first embodiment in the closing operation in which the opposed arc contact 11 is brought into contact with the movable arc contact 21. In the final stage of the charging operation, the roller 47 and the protrusion 43 abut on the front side. That is, the tension spring 91 is pulled, and the tension is stored as energy.

On the other hand, in the blocking operation, the roller 47 and the protrusion 43 that are in contact with each other on the front side in the closing state are separated from the surface of the protrusion 43 when the roller 47 exceeds the tip of the protrusion 43. Therefore, the tension spring 91 that has been pulled is released to return to its original state. As a result, torque is applied to the rotation lever 46, the rotation lever 46 rotates rearward, and the counter arc contact 11 is moved rearward. As a result, both the opposing arc contact 11 and the movable arc contact 21 move and are separated.

As described above, the auxiliary biasing body is a tension spring 91 having one end fixed in the opening / closing device and the other end connected to the rotation lever 46, as in the first embodiment. Without increasing the drive energy, the breaking speed between the electrodes can be relatively increased, and the cut-off performance and reliability are excellent, and the size and cost can be reduced.

Further, since the tension spring 91 has a relatively simple structure, an opening / closing device with high operational reliability can be obtained. Furthermore, responsiveness can be improved by using the tension spring 91 as an auxiliary biasing body. That is, in the first embodiment, since the annular portion of the torsion spring 49 is fitted to the rotation center 46c, a slight clearance is generated to convert the biasing force of the torsion spring 49 into the rotation of the rotation lever 46. Responsiveness may deteriorate due to loss or friction with the

pins

50 and 51. However, the tension spring 91 can be fixed to the

pins

50 and 51 at both ends. Can be improved.

[3. Third Embodiment]
A third embodiment will be described with reference to FIGS. The third embodiment is the same as the basic configuration of the first embodiment. In the following, only differences from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 15 is a cross-sectional view showing the overall configuration of the switchgear according to the third embodiment. As shown in FIG. 15, the opening / closing device of the present embodiment includes a spiral spring 92 as an auxiliary biasing body. The spiral spring 92 is a spring formed by winding a band in a spiral shape, and generates a restoring force by pulling the end of the band.

FIG. 16 is a cross-sectional view orthogonal to the flat surface 46b of the rotation lever 46, and shows the vicinity of the rotation lever 46. FIG. FIG. 17 is a cross-sectional view of the spiral spring 92 provided on the rotation shaft 46 a of the rotation lever 46 and is a cross-sectional view orthogonal to the rotation shaft 46 a of the rotation lever 46.

The spiral spring 92 is fitted to the rotating shaft 46a and gives torque to the rotating shaft 46a. That is, as shown in FIG. 16, the rotation shaft 46a is constructed so as to cross the inside of the energization support portion 14, and the rotation lever 46 is provided around the rotation shaft 46a. The spiral spring 92 is fitted to both ends of the rotating shaft 46 a while being in contact with the energization support portion 14.

As shown in FIGS. 16 and 17, a cylindrical case 93 is fitted to the rotating shaft 46a so that the rotating shaft 46a and the shaft are fitted to both ends of the rotating shaft 46a and fixed to the energizing support portion 14. The inner diameter of the cylindrical case 93 is larger than the outer diameter of the rotating shaft 46a, and a space is formed between the cylindrical case 93 and the rotating shaft 46a. A spiral spring 92 is disposed in this space.

One end of the spiral spring 92 is fitted and fixed to the rotating shaft 46 a, the rotating shaft 46 a is wound many times so that the band faces each other, and the other end is fixed to the inner peripheral surface of the cylindrical case 93. Since the cylindrical case 93 is fixed to the energization support portion 14, it cannot be rotated. In the spiral spring 92, the rotation direction of the rotary lever 46 in which the roller 47 rotates rearward is opposite to the winding direction of the spiral spring 92.

In the switchgear according to the present embodiment, in the closing operation in which the counter arc contact 11 is brought into contact with the movable arc contact 21, the spiral spring 92 band is displaced so as to wind the rotating shaft 46a, and the tension generated in the band is thereby increased. Accumulated as energy.

In the shut-off operation, the spiral spring 92 that has been entrained causes the roller 47 to move away from the projection 43, so that the lock is released and returns to its original state, and torque is applied to the rotating lever 46. Thereby, the counter arc contact 11 is moved backward. As a result, both the opposing arc contact 11 and the movable arc contact 21 move and are separated.

Thus, even if the spiral spring 92 is used as the auxiliary biasing body, the counter arc contactor 11 can be driven during the interruption operation without increasing the driving energy of the driving device. The

arc contacts

11 and 21 can be moved relative to each other. Therefore, it is possible to obtain a switchgear that is compact and low in cost, and that is excellent in blocking performance and reliability.

[4. Fourth Embodiment]
A fourth embodiment will be described with reference to FIGS. The fourth embodiment is the same as the basic configuration of the first embodiment. In the following, only differences from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 18 is a cross-sectional view showing the overall configuration of the switchgear according to the fourth embodiment. In the fourth embodiment, the auxiliary biasing body is a torsion bar 94. The torsion bar 94 is a round bar or a hollow bar. The torsion bar 94 is twisted by an external force in the circumferential direction and gives torque to the rotating shaft 46a by a restoring force of the twist. The torsion bar 94 is adjusted so that twisting is eliminated when the roller 47 is disposed in the rotation regulating device 70.

FIG. 19 is a cross-sectional view orthogonal to the flat surface 46 b of the rotation lever 46 and shows the vicinity of the rotation lever 46. As shown in FIG. 19, in this embodiment, the rotating shaft 46a is a cylinder, and the torsion bar 94 is fitted to the rotating shaft 46a. The torsion bar 94 is constructed so as to cross the inside of the energization support portion 14. Specifically, a pair of adapters 95 fixed to the energization support unit 14 are provided opposite to the energization support unit 14, and both ends of the torsion bar 94 are fixed in the energization support unit 14 by the adapter 95. Has been.

In the switchgear according to the present embodiment, in the closing operation in which the opposed arc contact 11 is brought into contact with the movable arc contact 21, the torsion bar 94 is twisted and the twist reaction force is stored as energy.

In the shut-off operation, the twisted torsion bar 94 is released when the roller 47 is separated from the projection 43, and the twisted reaction force is released to apply torque to the rotating lever 46. Thereby, the counter arc contact 11 is moved backward. As a result, both the opposing arc contact 11 and the movable arc contact 21 move and are separated.

Thus, even if the torsion bar 94 is used as an auxiliary biasing body, the counter arc contactor 11 can be driven during the interruption operation without increasing the driving energy of the driving device. The

arc contacts

[5. Fifth Embodiment]
A fifth embodiment will be described with reference to FIG. The fifth embodiment is the same as the basic configuration of the first embodiment. In the following, only differences from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 20 is a cross-sectional view showing the overall configuration of the switchgear according to the fifth embodiment. The guide rails 41 and 42 are fixed to the cylinder 24 or the movable energizing contact 22 so as to interlock with the movable contact 20 instead of the insulating nozzle 23. The guide rails 41 and 42 of the present embodiment are made of an insulating material such as resin.

The guide rails 41 and 42 are made of an insulating material and fixed to the cylinder 24 or the movable energizing contact 22 so that the counter arc contact 11 can be moved rearward as in the first embodiment. It is possible to relatively increase the separation speed between the electrodes without increasing the driving energy of the electrode, and it is possible to obtain a switchgear having excellent shut-off performance and reliability while achieving downsizing and cost reduction. . Further, a connecting member such as the coupling 32 is unnecessary, the number of parts can be reduced, and the cost can be reduced and the operation reliability can be improved.

[6. Sixth Embodiment]
A sixth embodiment will be described with reference to FIG. The sixth embodiment is the same as the basic configuration of the fifth embodiment. Hereinafter, only points different from the fifth embodiment will be described, and the same parts as those of the fifth embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 21 is a cross-sectional view showing the overall configuration of the switchgear according to the sixth embodiment. As shown in FIG. 21, the switchgear according to the present embodiment has an insulating rod 96 made of an insulating material such as resin. The insulating rod 96 is a cylindrical body, and is fixed to the cylinder 24 so as to extend along the common axis. The guide rails 41 and 42 according to the present embodiment are fixed to the cylinder 24 or the movable energizing contact 22 via the insulating rod 96 so as to be interlocked with the movable contact portion 20.

Since the guide rails 41 and 42 are provided via the insulating rod 96 as described above, the guide rails 41 and 42 can be made of a current-carrying material such as a metal instead of an insulating material. The mechanical strength can be increased.

[7. Other Embodiments]
In the present specification, a plurality of embodiments according to the present invention have been described. However, these embodiments are presented as examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

In the first to sixth embodiments, the auxiliary biasing body has been described as an aspect used as an auxiliary when moving the opposing arc contact 11 away from the movable arc contact 21. That is, the drive energy that the auxiliary biasing body gives to retract the counter arc contact 11 has been described as being smaller than the driving energy that the driving device gives to the operating rod 25, but the driving energy that the auxiliary biasing body gives is Even if the driving energy is equal to or exceeds the driving energy provided by the driving device, it is included in the scope of the invention described in the claims.

2 Sealed container 10 Opposing contact part 11 Opposing arc contact 12 Opposing energizing contact 13 Conducting sliding body 14 Energizing support part 20 Movable contact part 21 Movable arc contactor 22 Movable energizing contactor 23 Insulating nozzle 24 Cylinder 24a Release port 25 Operation rod 27 Piston 28 Piston support 31 Mechanical puffer chamber 32 Coupling 40

Auxiliary drive devices

41 and 42

Guide rails

43 and 44 Protrusion 45 Link 46 Rotating lever

46a Rotating shaft 46b Plane

46c Rotation center

47 and 48 Roller 49 Torsion spring 50 Fixed Point pin 51 Action point pin 70 Rotation restriction device 71 Piston 72 Elastic body 80 Guide 81 Sliding smooth body 91 Tension spring 92 Spiral spring 93 Cylindrical case 94 Torsion bar 95 Adapter 6 insulation rod

Claims

A switchgear that switches between cutting off and turning on current,
A counter-arc contact and a movable arc contact that contact or separate from each other when interrupted or charged, and arc discharge occurs in the separation process;
An operating rod that is provided on the movable arc contact, and advances and retracts the movable arc contact with respect to the opposing arc contact;
An urging body for applying an urging force for retreating the opposed arc contact with respect to the movable arc contact with the advancement and retraction of the movable arc contact by the operating rod;
Opening and closing device provided with.
A transmission mechanism for releasing or accumulating the urging force of the urging body in conjunction with the advance and retreat of the movable arc contact;
The switchgear according to claim 1.
The transmission mechanism is
A link rotatably connected to a rear end of the opposed arc contact;
A rotation lever connected to the link and rotating in response to the push / pull of the link;
A roller rotatably provided at one end of the rotating lever;
A guide rail fixed to the movable arc contact;
A first protrusion that is provided on the guide rail, is released from a contact state with the roller in the process of blocking, and releases a biasing force of the biasing body;
With
The biasing body applies a biasing force to the rotary lever so that the counter arc contact is driven in a direction opposite to the advance and retreat of the movable arc contact.
The switchgear according to claim 2.
The contact state of the first protrusion is released, the contact with the roller provided on the rotating lever that rotates in a direction in which the counter arc contact is retracted relative to the movable arc contact, and the rotation Equipped with a restricting rotation restricting mechanism,
The rotation restricting mechanism is
A piston in contact with the roller;
An elastic body that applies an urging force to the piston to attenuate the reverse speed of the opposed arc contact;
Comprising
The switchgear according to claim 3.
A roller rotatably provided at the other end of the rotating lever;
A second protrusion that is provided on the guide rail and stores the biasing body in the charging process;
Comprising
The switchgear according to claim 3 or 4.
The biasing body is a torsion spring having a pair of arms, one of the arms is fixed in the opening / closing device, and the other arm is connected to the rotating lever.
The switchgear according to any one of claims 3 to 5.
The biasing body is a tension spring having one end fixed in the opening / closing device and the other end connected to the rotating lever.
The switchgear according to any one of claims 3 to 5.
The biasing body is a spiral spring wound around the rotation shaft of the rotary lever.
The switchgear according to any one of claims 3 to 5.
The biasing body is a torsion bar fitted to the rotating shaft of the rotating lever.
The switchgear according to any one of claims 3 to 5.
An airtight container filled with arc-extinguishing gas,
A mechanical puffer chamber for accumulating the arc extinguishing gas in the sealed container and generating a gas flow for extinguishing the arc discharge;
An insulating nozzle that moves with the movable arc contact and induces and blows the gas flow into the arc discharge;
With
The guide rail is fixed to the insulating nozzle,
The switchgear according to any one of claims 3 to 9.
A sealed container filled with arc-extinguishing gas;
In the sealed container, the arc extinguishing gas is accumulated, a mechanical puffer chamber is formed that generates a gas flow for extinguishing the arc discharge, and a conductive cylinder;
Have
The cylinder moves with the movable arc contact;
The guide rail is made of an insulating material and is fixed to the cylinder.
The switchgear according to any one of claims 3 to 9.
A sealed container filled with arc-extinguishing gas;
In the sealed container, the arc extinguishing gas is accumulated, a mechanical puffer chamber is formed that generates a gas flow for extinguishing the arc discharge, and a conductive cylinder;
An insulating rod fixed to the cylinder;
Have
The cylinder moves with the movable arc contact;
The guide rail is fixed to the cylinder via the insulating rod.
The switchgear according to any one of claims 3 to 9.