JP6189166B2 - Switchgear - Google Patents

Description

  Embodiments described herein relate generally to a switchgear that switches between current interruption and input in a substation or switchgear of a power system.

  The switchgear is used when interrupting an excessive accident current, a small lead current, a delayed load current such as a reactor cutoff, or an extremely small accident current generated 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 currently called a puffer type is widely used (see, for example, Patent Document 1). 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.

  As a power source of the opening / closing device, a spring operation mechanism is often selected. This is because the spring operation mechanism is excellent in maintainability and reliability. However, the spring operation mechanism has lower driving energy than the hydraulic operation 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.

  Also known is an opening / closing device that not only transmits drive energy to the movable contact portion but also connects the movable contact portion and the opposing contact portion with a transmission mechanism (see, for example, Patent Document 2). 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. First, the movable contact portion includes an operation rod that is pushed or pulled by a power source directly or via an insulating rod, and operates by receiving a driving force from the power source. The opposing contact portion is connected to the movable contact portion via a coupling, a link, a cam, and a cam roller, and is operated by the movement of the movable contact portion. A groove drawn in an arc shape in which the cam roller slides is formed on the plane of the cam. The distance between the groove and the camshaft is continuously changed from far to near depending on the position.

  When the cam rotates, the cam roller having a fixed relationship with the opposed contact portion slides in the groove. When the position in the groove where the cam roller exists changes, the distance between the cam shaft and the opposing contact portion changes. That is, the opposed contact portion moves toward or away from the cam shaft according to the rotational direction of the cam. If the connection position of the link and the cam is adjusted, the opposing contact portion also opens according to the opening operation of the movable contact portion, and the opposing contact portion also changes according to the approaching operation. Moves closer.

  In the input state, the movable contact portion and the opposed contact portion are in contact with each other. At this time, the movable contact portion is held at the closing position, and the cam connected to the movable contact portion via the link cannot rotate. For this reason, the movement of the cam roller is also restrained in the groove, and the opposed contact portion that is fixed to the cam roller is also held at the closing position.

  The movable contact portion moves in the blocking direction in response to the blocking command. At this time, the cam rotates with the cam shaft as the center of rotation. The cam roller slides from a groove position furthest away from the cam shaft to a nearby groove position, and the opposing contact portion moves in the opposite direction to the movable contact portion.

Japanese Examined Patent Publication No. 7-109744 JP 2002-208336 A

  In the opening / closing device that moves both the movable contact portion and the opposing contact portion by the transmission mechanism, the separation speed of both contact portions can be improved even with low driving energy. However, in the high voltage class that requires two-cycle interruption, the stroke length of the opening of both contact parts becomes long. Therefore, when the groove is engraved so that the distance between the cam roller and the cam shaft is increased according to the stroke length, and the cam roller is located far from the cam shaft, the moment of inertia applied to the cam by the opposed contact portion is large. turn into.

  Then, immediately after the start of the shut-off operation, this moment of inertia greatly affects the initial movement of the cam, delaying the start of cam movement. That is, the movement of the opposing contact portion immediately after the start of the blocking operation becomes dull. This problem delays the opening time of the movable contact portion and the opposed contact portion from the reception of the interruption command, and as a result, it is difficult to realize the two-cycle interruption.

  The present invention has been made to solve the above-described problems, and provides a switchgear that can significantly shorten the opening time by speeding up the movement of the contact parts at the start of the breaking operation. With the goal.

  In order to achieve the above object, the switchgear according to the present embodiment is a switchgear that switches between conduction and interruption of current, and includes a first contact portion provided in one electric circuit and the other electric circuit. A second contact portion provided opposite to the first contact portion; and provided in the first contact portion, wherein the first contact portion is disposed with respect to the second contact portion. An operating rod to be advanced and retracted, and a driving force to transmit the driving force of the operating rod through the first contact portion, and to advance and retract the second contact portion in a direction opposite to the advance and retreat of the first contact portion. The mechanism and the second contact portion are accumulated by the advance toward the first contact portion, and the second contact portion is released by the retreat of the first contact portion with respect to the first contact portion. And an auxiliary biasing body that assists in driving the transmission mechanism.

  The transmission mechanism is connected to the first contact portion and is pushed and pulled according to the advancement and retraction of the first contact portion, and is connected to the link and is pushed and pulled according to the link. And a cam roller that is fixed to the second contact portion and is driven by the cam to move the second contact portion forward and backward with respect to the first contact portion. The auxiliary biasing body is a torsion spring in which one arm is connected to the cam and the other arm is fixed, and the auxiliary contact member is rotated in one direction with the advancement of the second contact portion. The restoring force is accumulated, the restoring force is released by the reverse rotation of the cam accompanying the backward movement of the second contact portion, and the reverse rotation of the cam is assisted. Also good.

  The transmission mechanism is coupled to the first contact portion and is pushed and pulled according to the advancement and retraction of the first contact portion, and is coupled to the link and is adapted to push and pull of the link. And a cam roller that is fixed to the second contact portion and is driven by the cam to move the second contact portion forward and backward with respect to the first contact portion. The auxiliary biasing body is a spiral spring that is wound around the cam shaft of the cam, and is restored by being wound around the cam shaft by the one-way rotation of the cam accompanying the advancement of the second contact portion. The force is stored, and the cam is unwound by the reverse rotation of the cam with the retraction of the second contact portion to release the restoring force, and the cam is placed on the cam shaft. A torque for rotating in the reverse direction may be applied.

  The transmission mechanism is coupled to the first contact portion and is pushed and pulled according to the advancement and retraction of the first contact portion, and is coupled to the link and is adapted to push and pull of the link. And a cam roller that is fixed to the second contact portion and is driven by the cam to move the second contact portion forward and backward with respect to the first contact portion. The auxiliary biasing body is a torsion bar fitted to the cam shaft of the cam, and accumulates restoring force by being twisted by the rotation of the cam accompanying the advancement of the second contact portion, By twisting the cam accompanying the retraction of the second contact portion, the twist is eliminated and the restoring force is released, and a torque for rotating the cam in the reverse direction is applied to the cam shaft. Also good.

  The transmission mechanism is coupled to the first contact portion and is pushed and pulled according to the advancement and retraction of the first contact portion, and is coupled to the link and is adapted to push and pull of the link. And a cam roller that is fixed to the second contact portion and is driven by the cam to move the second contact portion forward and backward with respect to the first contact portion. The auxiliary biasing body includes a sprocket that fits to a camshaft of the cam, a chain that spans the sprocket, and a compression spring that has a free end fixed to one end of the chain. The second contact portion is pulled by the one-way rotation of the cam with the advancement to accumulate the restoring force, and the cam of the second contact portion is retracted. The restoring force is released by turning in the opposite direction, and the chain is Said cam to said cam shaft through the sprocket and may be given a torque for rotating in the opposite direction.

  The transmission mechanism is sandwiched between a first rack gear provided in the first contact portion, a second rack gear provided in the second contact portion, the first rack gear, and the second rack gear. And the auxiliary biasing body is a torsion spring provided in the pinion gear, and the pinion gear is unidirectional with the advancement of the second contact portion. The restoring force is accumulated by the rotation, the restoring force is released by the reverse rotation of the pinion gear accompanied by the backward movement of the second contact portion, and the reverse rotation of the pinion gear is performed. You may make it assist.

  The transmission mechanism is sandwiched between a first rack gear provided in the first contact portion, a second rack gear provided in the second contact portion, the first rack gear, and the second rack gear. The auxiliary biasing body is fixed at one end to the second rack gear and separates the second contact portion from the first contact portion. A tension spring that pulls, is stretched by movement of the second rack gear accompanying the advancement of the second contact portion, accumulates a restoring force, and stores the second contact portion by the retraction of the second contact portion. The restoring force may be released by the movement of the second rack gear, and the rotation of the pinion gear may be assisted by pulling the second rack gear.

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 process. 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, and shows an electric current addition state. It is sectional drawing which shows the whole structure of the switchgear which concerns on 3rd Embodiment, and shows an electric current interruption process. It is sectional drawing which shows the whole structure of the switchgear which concerns on 4th Embodiment. It is sectional drawing which concerns on 4th Embodiment and is orthogonal to the board surface of a cam, and shows a cam and its periphery. It is sectional drawing of the spiral spring provided in a cam shaft according to 4th Embodiment, and shows the cross section orthogonal to a cam shaft. It is sectional drawing which shows the whole structure of the switchgear which concerns on 5th Embodiment. It is sectional drawing orthogonal to the board surface of a cam concerning 5th Embodiment, and shows a cam and its periphery. It is sectional drawing which shows the whole structure of the switchgear which concerns on 6th Embodiment, and shows an electric current addition state. It is sectional drawing which shows the whole structure of the switchgear which concerns on 6th Embodiment, and shows an electric current interruption process. It is sectional drawing which shows the whole structure of the switchgear which concerns on 7th Embodiment. It is sectional drawing which shows the whole structure of the switchgear which concerns on 8th Embodiment.

(First embodiment)
(Outline configuration)
As shown in FIG. 1, the switchgear according to the present embodiment includes a gas circuit breaker configured by opposing an opposing contact portion 10 and a movable contact portion 20 in a sealed container 2 filled with an arc extinguishing gas. It is. This gas circuit breaker switches between turning on and off the current by bringing the opposed contact portion 10 and the movable contact portion 20 into and out of contact with each other. In the current interruption process, an arc discharge is generated between the opposed contact portion 10 and the movable contact portion 20. The gas circuit breaker is provided with a gas flow generating means such as a puffer type, and is extinguished by injecting an arc extinguishing gas into the arc discharge, and the gas circuit breaker is cut off at the current zero point.

  Hereinafter, in each of the opposed contact part 10 and the movable contact part 20, the side facing the other contact or the side where arc discharge is ignited is referred to as the front or front end, and the opposite side is referred to as the rear or rear end. .

  First, the movable contact portion 20 includes an operation rod 25. The operating rod 25 is pushed and pulled by the operating force of a driving device (not shown), and the movable contact portion 20 moves forward or backward in conjunction with the pushing and pulling of the operating rod 25.

  On the other hand, the opposed contact portion 10 is connected to a cam 41 that is fixedly installed in the sealed container 2 and is rotatable. The cam 41 is connected to the movable contact portion 20 by a link 42. The link 42 and the cam 41 are components of the transmission mechanism 40 that transmits the operating force of the operating rod to the opposed contact portion 10. Further, a torsion spring 51 which is installed at a fixed point and can be elastically deformed is installed in the sealed container 2. The torsion spring 51 is an auxiliary biasing body that applies a biasing force to the cam 41 and assists the cam 41 in one direction of rotation. The rotation direction assisted by the torsion spring 51 is a direction in which the opposing contact portion 10 is retracted.

  The backward movement of the movable contact portion 20 rotates the cam 41 via the link 42. The rotation is assisted by the torsion spring 51. As a result, the opposing contact portion 10 is retracted and pulled away from the movable contact 20 in the opening direction. Further, the forward movement of the movable contact portion 20 rotates the cam 41 in the opposite direction via the link 42 while accumulating the torsion spring 51. Thereby, the opposing contact part 10 is pushed in the contact direction with the movable contact part 20.

  A shock absorber 70 is installed in the vicinity of the cam 41. The shock absorber 70 stops the cam 41 that has been rotated by a certain angle or more when the opposed contact portion 10 and the movable contact portion 20 are separated from each other, and alleviates the impact on each mechanism that accompanies the stop of the current interruption drive.

  The opposing contact portion 10 is provided with an opposing arc contact 11 and an opposing energizing contact 12. The movable contact portion 20 is provided with a movable arc contact 21 and a movable energizing contact 22. In the sealed container 2, the opposed energizing contact 12 and the movable energizing contact 22 are opposed to each other, and switching on and off of current is switched by their contact and separation. The opposed arc contact 11 and the movable arc contact 21 are opposed to each other, and the arc discharge is assumed by the separation.

  The gas flow generating means is a mechanical puffer chamber 31 that provides a mechanical compression action of 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 insulating nozzle 23 surrounds the discharge port of the mechanical puffer chamber 31 and further surrounds the movable arc contactor 21 to the tip, thereby surrounding the arc discharge generation space and the arc extinguishing property discharged from the mechanical puffer chamber 31. Guide the gas to the arc discharge.

  In this gas circuit breaker, the opposed energizing contact 12 and the movable energizing contact 22 are separated, the opposed arc contact 11 and the movable arc contact 21 take over arc discharge, and at the same time, arc extinguishing gas in the mechanical puffer chamber 31. And the arc extinguishing gas is injected into the arc discharge through the insulating nozzle 23, and the current zero point is reached and the current is interrupted.

(Detailed configuration)
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 thereof, or other gas excellent in arc extinguishing performance and insulation performance. Desirably, the arc-extinguishing gas is a single gas or a mixed gas of a gas having a global warming potential lower than that of sulfur hexafluoride gas, having a low molecular weight, and at least 1 atm and 20 degrees centigrade. 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 opposed contact portion 10 includes a support tube 9 having a cylindrical shape with openings at both ends fixed in the sealed container 2. The opposing energizing contact 12 is fitted into the tip of the support cylinder 9 and can be moved forward and backward. That is, the opposed energizing contact 12 is a cylindrical conductor having both ends open, and has a common shaft with the support cylinder 9, and the outer diameter thereof is substantially the same as the inner diameter of the support cylinder 9. The term “substantially the same” refers to a range in which the opposed energizing contact 12 does not wobble and can slide within the support tube 9. The front end side of the opposed energizing contact 12 protrudes from the support cylinder 9 to the movable contact portion 20 side. The opening edge of the tip of the opposed energizing contact 12 bulges inside.

  On the inner peripheral surface of the support cylinder 9, a sliding smooth surface 13 is embedded in the contact area with the opposing energizing contact 12 with the surface exposed. The smooth sliding surface 13 is a conductor that electrically connects the support cylinder 9 and the opposed energizing contact 12. Furthermore, the sliding smooth surface 13 can reduce the coefficient of friction with the opposed energizing contact 12 or can be elastically deformed with respect to the displacement of the opposed energizing contact 12.

  The counter arc contact 11 is a cylindrical conductor whose tip is rounded. The counter arc contact 11 is disposed in the counter energization contact 12 and extends on the rounded side toward the movable contact 20 along the common axis. The opposed arc contact 11 is fixed by a support 14 extending from the inner peripheral surface of the opposed energized contact 12.

  The support 14 is a plurality of conductive plates whose plate surfaces are aligned with the axis of the gas circuit breaker, and are erected at a predetermined angle interval along the circumferential direction of the opposed energizing contact 12 to each common axis. It has been extended. The counter arc contact 11 is located in the center where the conductor plates of the support 14 are gathered, and is formed integrally with the support 14 or fixed to the support 14 to be supported in the counter energizing contact 12. The opposed arc contact 11 and the opposed energized contact 12 are electrically connected by a support 14 and are in a fixed relationship and move in conjunction with each other.

  In the movable contact portion 20, the operation rod 25 is a hollow cylinder whose tip is open, 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 an insulating rod (not shown), and is pushed forward along the common axis or pulled backward.

  The movable arc contactor 21 is a conductor having an internal hollow cylindrical shape that is open at both ends. The movable arc contact 21 has the same diameter as the operation rod 25, extends continuously from the tip opening edge of the operation rod 25, and the tip opening faces the counter arc contact 11.

  The opening edge of the movable arc contact 21 bulges inside. The inner diameter of the opening edge portion matches the outer diameter of the counter arc contact 11. The movable arc contact 21 is fixed to the operating rod 25, and is moved toward and away from the opposing arc contact 11 in conjunction with the operating rod 25, so that the opposing arc contact 11 is inserted into the opening of the movable arc contact 21. Thus, the movable arc contact 21 and the counter arc contact 11 are brought into conduction.

  In addition, the front-end | tip of the movable arc contactor 21 may be formed as a finger-like electrode by dividing | segmenting 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 counter arc contact 11.

  The mechanical puffer chamber 31 is a gas flow generating means constituted 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 that extends from the piston 27 in the direction opposite to the facing contact portion 10, and is located on the outer shell side from the operation rod 25.

  A space defined by the cylinder 24 and the piston 27 is a mechanical puffer chamber 31. 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. The mechanical puffer chamber 31 and its outdoor space are opposed to each other. It is connected on the arc contact 11 side.

  The insulating nozzle 23 is an internal 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.

  Further, 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 is a shape that expands linearly toward.

  The movable energizing contact 22 is a conductor having a cylindrical shape with an open end. The movable energizing contact 22 has a cylindrical wall on the outer side of the insulating nozzle 23 and is erected on the bottomed portion of the cylinder 24 toward the opposing energizing contact 12. The movable energizing contact 22 faces the counter energizing contact 12.

  The outer diameter of the movable energizing contact 22 matches the inner diameter of the opening edge portion that bulges inside the opposing energizing contact 12. When the movable energizing contact 22 is inserted into the opening of the opposed energizing contact 12, the inner surface of the opposed energizing contact 12 and the outer surface of the movable energizing contact 22 are brought into contact with each other and become electrically conductive.

  A coupling 43 is extended from the tip of the insulating nozzle 23 toward the counter contact portion 10. The coupling 43 is a so-called joint, and is an extension member for connecting the cam 41 and the movable contact portion 20 with a link 42. This coupling 43 has a cylindrical shape at the base end, is fitted into the insulating nozzle 23, and extends in a rod shape from the base end until it enters the counter arc contact 11.

  A pin coupling portion is provided at the tip of the coupling 43. The link 42 has a rod shape or a thin plate shape, one end is pin-coupled to the coupling 43 at a pin coupling portion, and the other end extends toward the cam 41. The pin axis of the pin coupling portion is orthogonal to the common axis of the gas circuit breaker. The other end of the link 42 is pin-coupled by a pin coupling portion provided on the cam 41 and coupled to the cam 41. The pin axis of the pin coupling part is also orthogonal to the common axis of the gas circuit breaker and is parallel to the pin axis of the pin coupling part with the coupling 43.

  The cam 41 is a plate-like member whose plane is arranged along the common axis of the gas circuit breaker, and a cam shaft 41a parallel to the pin axis of each pin coupling portion is fixed to the support cylinder 9 and is rotatably fixed. Has been. The fixed position of the cam 41 is behind the support 14 and the rear end of the counter arc contact 11.

  The plane of the cam 41 has a cam groove plane 41c on one side and a lever surface 41d on the opposite side with respect to the cam shaft 41a. The lever surface 41d has a slender shape extending from the cam shaft 41a as a base end, the pin coupling portion is provided at the tip of the lever surface 41d, and the cam 41 is connected to the link 42 at the tip of the lever surface 41d.

  The cam groove plane 41c has a semicircular shape that bulges toward the support 14 and the opposed arc contact 11 side. The cam shaft 41a is eccentric with respect to the cam groove plane 41c, and the radial center of the cam groove plane 41c is located on the opposite side of the lever surface 41d with the cam shaft 41a as the center.

  A cam groove 41b on which the cam roller 44 slides is formed on the cam groove plane 41c. A rod extending toward the cam 41 is integrally or firmly fixed to the rear end of the opposed arc contact 11, and the cam roller 44 is provided at the end of the rod on the cam 41 side. That is, the opposed contact portion 10 is driven by the rotation of the cam 41 via the rod and the cam roller 44.

  The cam groove 41b is composed of a plurality of arcs, and adjacent arcs have a continuous shape. The plurality of arcs are configured by a combination of an arc that swells toward the opposing contact portion 10 and an arc that swells toward the opposite side of the opposing contact portion 10, and defines the moving speed of the cam roller 44 in the central axis direction. The cam groove 41b is engraved so as to approach the cam shaft 41a with the rotation of the cam 41 (counterclockwise in the drawing) in which the cam groove plane 41c moves far from the opposed contact portion 10. That is, the cam groove 41b extends so as to approach the cam groove 41b as it approaches the lever surface 41d.

  Specifically, the cam groove 41b gradually approaches the cam shaft 41a from the farthest end from the cam shaft 41a while drawing an arc that swells toward the counter contact portion 10, and the counter contact in the vicinity of the cam shaft 41a. Instead of an arc that swells on the opposite side of the portion 10, it faces the pin coupling portion side of the lever surface 41d and reaches the nearest end closest to the cam shaft 41a on the opposed contact portion 10 side.

  In other words, the cam roller 44 fixed to the opposed contact portion 10 gradually approaches the cam shaft 41a from the state where the cam roller 44 is pushed to the movable contact portion 20 side so as to be farthest from the cam shaft 41a at the farthest portion. To the side opposite to the movable contact portion 20. Alternatively, the cam roller 44 fixed to the opposed contact portion 10 is movable so as to gradually move away from the cam shaft 41a from the state where the cam roller 44 is drawn closest to the cam shaft 41a at the nearest portion. It is pushed into the child part 20 side.

  An annular portion of the torsion spring 51 is fitted to the cam shaft 41 a of the cam 41. A fixed point pin 82 is erected on the support cylinder 9 so as to be orthogonal to the axis of the gas circuit breaker and parallel to the cam shaft 41a. On the cam groove plane 41c, an action point pin 81 that is orthogonal to the axis of the gas circuit breaker and parallel to the cam shaft 41a is provided upright. The torsion spring 51 hooks two arms extending in the opposite direction from the annular portion on the fixed point pin 82 and the action point pin 81.

  The angle formed by the two arms of the torsion spring 51 is wider than the free angle, and the torsion spring 51 always applies a biasing force to rotate the cam 41 in one direction so as to narrow the opening angle of the arm. . One arm is in contact with the peripheral surface of the action point pin 81 on the counter contact portion 10 side. That is, one arm is hooked to the action point pin 81 so as to apply a biasing force to the cam 41 in the direction in which the cam roller 44 approaches the cam shaft 41a along the cam groove 41b. In other words, the cam groove plane 41c is gas-blocked. The action point pin 81 is hooked so as to rotate to the rear side of the container or to move the counter contact portion 10 to the rear side.

  The shock absorber 70 is installed further rearward than the cam 41. The distance between the shock absorber 70 and the cam shaft 41a is shorter than the distance between the cam shaft 41a and the farthest end of the cam groove plane 41c. Therefore, when the cam 41 rotates by a certain angle, the cam groove flat surface 41c that moves backward while rotating and the shock absorber 70 come into contact with each other.

  The shock absorber 70 is fixed in the support cylinder 9 and extends perpendicularly to the plane of the cam 41, and has a triple-shell structure. The innermost shell is a solid cylindrical shaft 71 serving as a core, the outermost shell is a flexible circular tube 72, and an elastic body 73 is filled between the cylindrical shaft 71 and the circular tube 72.

(Function)
The operation of the above switchgear will be described. As shown in FIG. 1, in the energized state, the movable contact portion 20 is pushed in the direction of the opposed contact portion 10 by the push of the operation rod 25 by the driving device, and the position is held. The lever surface 41 d of the cam 41 is pushed rearward from the cam shaft 41 a through the coupling 43 and the link 42. The cam groove flat surface 41c located on the opposite side of the lever surface 41d with the cam shaft 41a as the center rotates to the front of the cam shaft 41a, in other words, the movable contact portion 20 side, and is stationary.

  In the state where the cam groove plane 41c is stationary in the front, the intersection of the cam groove 41b and the common shaft is separated from the cam shaft 41a toward the movable contact portion 20 side. Therefore, the cam roller 44 on the common shaft is pushed into the movable contact portion 20 side so as to be separated from the cam shaft 41a, and the entire opposed contact portion 10 having a fixed relationship with the cam roller 44 is also pushed into the movable contact portion 20 side. The position is held.

  At this time, both the opposed contact portion 10 and the movable contact portion 20 are actively approaching the other, the opposed energized contact 12 and the movable energized contact 22 are in contact, and the opposed arc contact 11 and the movable arc contact. The child 21 is in contact.

  The torsion spring 51 is expanded until the opening angle of the arms becomes an obtuse angle by the forward movement of the action point pin 81, and accumulates energy in the direction of narrowing the opening angle, that is, in the direction of rotating the cam groove plane 41c backward. doing.

  In this energized state, the cooling cylinder 9, 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.

  When receiving an interruption signal from the outside and interrupting an accident current or the like, the gas circuit breaker opens the opposing contact portion 10 and the movable contact portion 20 to interrupt the current as shown in FIG. Specifically, the operating rod 25 receives the operating force of the driving device and moves rearward along the common axis. The movable contact portion 20 moves backward so as to be dragged by the operation rod 25 and away from the opposing contact portion 10.

  The backward movement of the movable contact portion 20 urges the backward movement of the coupling 43 provided at the tip of the insulating nozzle 23. The coupling 43 drags the link 42 pin-coupled at the tip thereof toward the movable contact portion 20 side. The link 42 rotates and moves the lever surface 41 d of the cam 41 so as to approach the opposing contact portion 20. The rotational movement of the lever surface 41 d is accompanied by the rotation of the cam 41, and the cam groove plane 41 c rotates backward so as to be separated from the opposing contact portion 10.

  The torsion spring 51 biases the rotation of the cam 41 via the action point pin 81. The torsion spring 51 permitted to return to the free angle by the backward movement of the operating rod 25 releases the stored energy, and provides the cam 41 with the forward movement of the lever surface 41d. The release of the torsion spring 51 assists the initial movement of the cam 41 and increases the driving force of the opposing contact portion 10 and the movable contact portion 20. Furthermore, the torsion spring 51 that assists the driving force reduces the load generated in the direction perpendicular to the common axis with respect to the link 42.

  When the cam groove plane 41c is rotated backward by using the rotation assist by the torsion spring 51 together, the intersection of the common shaft and the cam groove 41b, that is, the position of the cam roller 44 gradually increases from the farthest end from the cam shaft 41a. Approaches the camshaft 41a. In other words, the cam roller 44 is pulled backward so as to approach the cam shaft 41a from a state where the cam roller 44 is pushed forward most away from the cam shaft 41a.

  Then, the opposing contact portion 10 that is in a fixed relationship with the cam roller 44 via the rod follows the movement of the cam roller 44 and moves backward so as to be separated from the movable contact portion 20. The opposing energizing contact 12 slides on the sliding smooth surface 13 and moves backward in the support tube 9. Alternatively, the opposing energizing contact 12 moves backward in the support tube 9 while elastically deforming the sliding smooth surface 13.

  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 the operation rod 25 is retracted, the bottom of the cylinder 24 connected to the operation rod 25 approaches the piston 27 whose position is fixed. The volume of the mechanical puffer chamber 31 is reduced, and the arc extinguishing gas in the mechanical puffer chamber 31 is accumulated according to Boyle's law.

  When the operation rod 25 is further retracted, the distance between the opposed arc contact 11 and the movable arc contact 21 is sufficiently opened, and 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.

  In the final stage of the blocking operation, the cam 41 rotates until the cam groove flat surface 41c comes into contact with the rear shock absorber 70, and is stopped by the cam groove flat surface 41c coming into contact with the shock absorber 70. The impact generated by the contact is absorbed when the elastic body 73 filled between the cylindrical shaft 71 and the circular tube 72 is deformed. Therefore, the impact force with respect to each component in the airtight container 2 including the cam 41 is relieved.

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

(effect)
As described above, the opening / closing device of the present embodiment causes the movable contact portion 20 and the opposed contact portion 10 to face each other, and the movable contact portion 20 is provided with the movable contact portion 20 as the opposed contact portion 10. An operation rod 25 that moves forward and backward is provided. Further, a transmission mechanism 40 is provided that transmits the driving force of the operating rod 25 through the movable contact portion 20 and advances and retracts the opposing contact portion 10 in the direction opposite to the advance and retreat of the movable contact portion 20. Then, the accumulating force is accumulated by the advancement of the opposed contact portion 10 toward the movable contact portion 20, and the auxiliary contact portion 10 is released by retreating the opposed contact portion 10 with respect to the movable contact portion 20 to assist the drive of the transmission mechanism 40. A force was provided.

  The transmission mechanism 40 includes, for example, a link 42, a cam 41, and a cam roller 44. The link 42 is connected to the movable contact portion 20, and is pushed and pulled according to the advancement and retraction of the movable contact portion 20. The cam roller 44 is connected to the link 42 and rotates according to the push / pull of the link 42, and the cam roller 44 is fixed to the counter contact portion 10, and is driven by the cam 41 to move the counter contact portion 10 to the movable contact portion 20. Move forward and backward.

  The auxiliary biasing body is, for example, a torsion spring 51 in which one arm is connected to the cam 41 and the other arm is fixed, and is restored by one-way rotation of the cam 41 with the advancement of the opposed contact portion 10. The force was accumulated, and the restoring force was released by the reverse rotation of the cam 41 accompanied by the retreat of the opposed contact portion 10 to assist the reverse rotation of the cam 41.

  Thereby, the initial movement of the cam 41 that receives a large moment of inertia from the opposed contact portion 10 is assisted by the auxiliary biasing body, and the start of movement of the cam 41 can be smoothed. For this reason, the opening time of the movable contact portion 20 and the facing contact portion 10 can be shortened such that two-cycle interruption can be realized.

  Further, at a high voltage level, the stroke length between the movable contact portion 20 and the opposed contact portion 10 becomes long, and this stroke length extends from the center of the cam shaft 41a of the cam 41 to the pin coupling portion with the link 42. Increase the distance. For this reason, the insulating nozzle 23 connected to the link 42 via the coupling 43 is given a load in a direction orthogonal to the traveling direction from the link 42. However, since there is auxiliary rotation of the cam 41 by the auxiliary biasing body, the driving force transmitted to the transmission mechanism 40 can be reduced by that amount, the load can be reduced, and the insulating nozzle 23 having a relatively low strength can be damaged. Can be reduced.

  In addition, the shock absorber 70 is provided in the vicinity of the cam 41 and includes an elastic body 73. The shock absorber 70 is in contact with the cam 41 rotated by a predetermined angle or more to restrict the rotation. . Thereby, even if the rotation of the cam 41 is stopped, the shock force can be absorbed by the shock absorber 70, so that the impact of each drive location including the cam 41 can be reduced and a highly reliable opening / closing device can be realized. it can.

(Second Embodiment)
FIG. 3 is a cross-sectional view showing the overall configuration of the gas circuit breaker according to the second embodiment. In this gas circuit breaker, the torsion spring 51 has an annular portion fitted into the cam shaft 41a, one arm hooked to an action point pin 81 erected on the cam groove plane 41c, and the other arm shock absorber 70. It is caught in A shock absorber 70 replaces the fixed point pin 82.

  That is, the shock absorber 70 stops the cam 41, absorbs the impact of the cam 41, reduces the impact of each mechanism of the gas circuit breaker, and further substitutes the fixed point pin 82. In other words, the arm to which the torsion spring 51 is fixed is hooked on the shock absorber 70. Therefore, the material cost and the number of assembly processes can be greatly reduced by reducing the number of parts.

(Third embodiment)
FIG. 4 is a cross-sectional view showing the overall configuration of the gas circuit breaker according to the third embodiment. In this gas circuit breaker, the free angle of the torsion spring 51 is adjusted to be smaller than the angle formed by the fixed point pin 82, the cam shaft 41a, and the action point pin 81 when the cam 41 abuts against the shock absorber 70. Yes. A pair of fixed point pins 83 are disposed in the support cylinder 9 in close proximity. One arm of the torsion spring 51 is sandwiched between the pair of fixed point pins 83.

  As shown in FIG. 5, at the initial stage of the closing operation, one arm of the torsion spring 51 is in a state of being detached from the action point pin 81. However, the posture of the torsion spring 51 is maintained by fitting the annular portion to the cam shaft 41 a and holding the one arm by the pair of fixed point pins 83. When the closing operation further proceeds, the action point pin 81 comes into contact with one arm of the torsion spring 51 in response to the rotation of the cam 41, and the action point pin 81 contracts the torsion spring 51. Since this gas circuit breaker does not require energy for storing the torsion spring 51 at the beginning of the closing operation, the total amount of energy required for the driving device can be reduced.

  Here, in the initial stage of the shut-off operation, the cam roller 44 and the cam 41 axis are separated from each other, and the moment of inertia applied to the cam 41 by the opposed contact portion 10 is large. Therefore, the largest driving force is required for the initial movement of the cam 41. On the other hand, when the shut-off operation proceeds, the cam roller 44 and the cam shaft 41a become closer to each other, so that the moment of inertia is reduced, and the driving force necessary for moving the opposed contact portion 10 and the movable contact portion 20 by the inertia force. Therefore, the assistance of the torsion spring 51 is not necessary.

  In the initial period of the shut-off operation, the torsion spring 51 has stored energy because it is contracted from the free angle. Therefore, the torsion spring 51 can assist the initial movement of the cam 41. On the other hand, when the moment of inertia is small and the driving force required for movement is small, the torsion spring 51 uses up the stored energy, and the arm is detached from the action point pin 81 as shown in FIG. It can be rotated only with the operating force Therefore, the energy stored in the torsion spring 51 can be used efficiently.

  As described above, in this embodiment, the torsion spring 51 has a free angle smaller than the rotation angle of the cam 41 until the interruption is completed, and is detached from the cam 41 during the rotation of the cam 41. Thereby, the energy to be stored in the torsion spring 51 can be small, and can be used for the initial movement of the cam 41 that needs the stored energy most. Therefore, efficient rotation assistance of the cam 41 can be executed, and energy required for the closing operation can be reduced.

(Fourth embodiment)
FIG. 6 is a configuration diagram showing a gas circuit breaker according to the fourth embodiment, and FIG. 7 is a cross-sectional view orthogonal to the plate surface of the cam 41, showing the cam 41 and its periphery. FIG. 8 is a cross-sectional view of a spiral spring provided on the cam shaft 41a, and shows a cross section orthogonal to the cam shaft 41a.

  In the first embodiment, the torsion spring 51 is disposed as an auxiliary biasing body that assists the rotation of the cam 41. However, the present invention is not limited to this, and various auxiliary biasing bodies can be applied. The gas circuit breaker according to the fourth embodiment shows another example of the auxiliary biasing body.

  As shown in FIG. 6, this gas circuit breaker includes a spiral spring 52 as an auxiliary biasing body. The spiral spring 52 is fitted to the cam shaft 41a and gives torque to the cam shaft 41a. As shown in FIG. 7, the cam shaft 41a is installed so as to cross the inside of the support cylinder 9, the cam 41 is fitted to the center of the cam shaft 41a, and the spiral spring 52 is connected to both ends of the cam shaft 41a. Are fitted in contact with the support tube 9.

  As shown in FIG. 8, a cylindrical case 53 concentric with the cam shaft 41a is fitted into the cam shaft 41a. The inner diameter of the cylindrical case 53 is larger than the outer diameter of the cam shaft 41a, and a space is generated between the cylindrical case 53 and the cam shaft 41a. The spiral spring 52 is disposed between the cam shaft 41 a and the cylindrical case 53.

  The spiral spring 52 has a long plate shape, one end is fixed to the cam shaft 41 a, the cam shaft 41 a is wound many times so as to face the plate surface, and the other end is fixed to the inner peripheral surface of the cylindrical case 53. Is done. The cylindrical case 53 is fixed to the inner peripheral surface of the support cylinder 9 and cannot rotate. In this spiral spring 52, the turning direction of the cam 41 in which the cam groove plane 41 c rotates forward is opposite to the turning direction of the spiral spring 52.

  In the gas circuit breaker including the spiral spring 52, the rotation of the cam 41 that moves the cam groove plane 41c forward, that is, the closing operation of bringing the opposed contact portion 10 into contact with the movable contact portion 20 is performed. Is displaced so as to involve the cam shaft 41a, and the tension generated on the plate surface is stored as energy.

  In the shut-off operation, the entrained spiral spring 52 starts releasing to return to the original state by the retracting movement of the operating rod 25, and torque is applied to the cam shaft 41a so as to move the cam groove plane 41c backward. Therefore, the cam 41 fitted in the cam shaft 41a is assisted by the energizing force of the operating rod 25 via the movable contact portion 20, the coupling 43, and the link 42, and is assisted by the release of the spiral spring 52. It rotates so that the plane 41c may move back, and the movable contact part 20 and the opposing contact part 10 are separated from each other.

  As described above, in the opening / closing apparatus according to the fourth embodiment, the auxiliary biasing body is the spiral spring 52 wound around the cam shaft 41 a of the cam 41, and the cam 41 with the advance of the opposed contact portion 10. Is wound around the cam shaft 41a by rotating in the direction and accumulates the restoring force, and is unwound around the cam shaft 41a by rotating in the reverse direction of the cam 41 accompanied by the retreat of the opposed contact portion 10 to release the restoring force. The cam shaft 41a is given a torque that rotates the cam 41 in the reverse direction.

  Thus, even if the auxiliary biasing body is the spiral spring 52, the initial movement of the cam 41 that receives a large moment of inertia from the opposed contact portion 10 is assisted by the auxiliary biasing body, and the start of movement of the cam 41 can be smoothed. For this reason, the opening time of the movable contact portion 20 and the facing contact portion 10 can be shortened such that two-cycle interruption can be realized. Further, the possibility of breakage of the insulating nozzle 23 having a relatively low strength can be reduced.

(Fifth embodiment)
FIG. 9 is a configuration diagram illustrating a gas circuit breaker according to a fifth embodiment. As shown in FIG. 9, the gas circuit breaker includes a torsion bar 54 as an auxiliary biasing body. The cam shaft 41e is a cylinder, and the torsion bar 54 is disposed by being fitted to the cam shaft 41e. The torsion bar 54 is a round bar or a hollow bar, generates a twist by an external force in the circumferential direction, and gives a torque to the cam shaft 41e by restoring the twist. The torsion bar 54 is adjusted so that twisting is eliminated when the cam 41 contacts the shock absorber 70.

  FIG. 10 is a cross-sectional view orthogonal to the plate surface of the cam 41 and shows the cam 41 and its periphery. As shown in FIG. 10, the torsion bar 54 is constructed so as to cross the inside of the support tube 9. Specifically, adapters 55 are provided at both ends of the torsion bar 54. The adapter 55 is fixed to the support tube 9. The torsion bar 54 is fixed in the support cylinder 9 by an adapter 55. The cam shaft 41 e is a cylinder shorter than the inner diameter of the support cylinder 9 and is fitted to the torsion bar 54.

  In the gas circuit breaker provided with the torsion bar 54, the torsion bar 54 is twisted in the rotation of the cam 41 that moves the cam groove plane 41c forward, that is, in the closing operation in which the opposing contact portion 10 is brought into contact with the movable contact portion 20. And twisting reaction force is accumulated.

  In the shut-off operation, the twisted torsion bar 54 starts releasing the torsional reaction force to return to the original position by the retracting movement of the operating rod 25, and torque is applied to the cam shaft 41e so as to move the cam groove plane 41c backward. give. Therefore, the cam 41 fitted in the cam shaft 41e is assisted by the release of the spiral spring 52 together with the retracting force of the operating rod 25 via the movable contact portion 20, the coupling 43, and the link 42. It rotates so that the plane 41c may move back, and the movable contact part 20 and the opposing contact part 10 are separated from each other.

  As described above, in the gas circuit breaker according to the fifth embodiment, the auxiliary biasing body is the torsion bar 54 fitted to the cam shaft 41 e of the cam 41, and the cam accompanying the advancement of the opposed contact portion 10. 41 is twisted to accumulate the restoring force, and the cam 41 accompanied by the retraction of the opposed contact portion 10 is released to twist and releases the restoring force, and the cam 41 is reversed to the cam shaft 41e. A torque for rotating in the direction was applied.

  Thereby, even if the auxiliary biasing body is the torsion bar 54, the initial movement of the cam 41 that receives a large moment of inertia from the opposed contact portion 10 is assisted by the auxiliary biasing body, and the start of movement of the cam 41 can be smoothed. For this reason, the opening time of the movable contact portion 20 and the facing contact portion 10 can be shortened such that two-cycle interruption can be realized. Further, the possibility of breakage of the insulating nozzle 23 having a relatively low strength can be reduced.

(Sixth embodiment)
FIG. 11 is a configuration diagram illustrating a gas circuit breaker according to a sixth embodiment. As shown in FIG. 11, the gas circuit breaker includes a compression spring 56 as an auxiliary biasing body. Further, a chain mechanism 57 for transmitting the restoring force of the compression spring 56 is provided. Energy is stored in the compression spring 56, and the chain mechanism 57 applies torque to the cam shaft 41a by releasing the energy.

  The chain mechanism 57 includes a sprocket 57a fitted to the camshaft 41a and a chain 57b spanned over the sprocket 57a. The chain 57b extends rearward beyond the shock absorber 70, and has an end fixed to the compression spring mechanism. The chain 57b is stretched over the sprocket 57a from the cam groove plane 41c side so that the cam groove plane 41c rotates rearward when pulled.

  The compression spring 56 is fixed to the base 58 and has a spring receiver 59 at the free end. The base 58 is fixed in the support cylinder 9 and is installed behind the shock absorber 70. The base 58 is a plate-like base on which the compression spring 56 is installed, and has a base surface orthogonal to the common axis. The compression spring 56 is fixed to the rear side surface of the base 58. An opening is provided in the base 58, and the chain 57 b extends from the opening and extends to the rear of the base 58. The extension destination of the chain 57 b is a spring receiver 59, and one end of the chain 57 b is fixed to the spring receiver 59.

  As shown in FIG. 11, in the current application state, the opposed contact portion 10 is moved to the movable contact portion 20 side, and the cam 41 is rotated so that the cam groove plane 41c is located on the front side. . The sprocket 57a entrains the chain 57b suspended from the cam groove plane 41c side, and the chain 57b is pulled forward. The tension of the chain 57b moves the spring receiver 59 forward. Therefore, the compression spring 56 is compressed between the base 58 and the spring receiver 59 and accumulates a restoring force extending rearward.

  Then, as shown in FIG. 12, in the shut-off operation, the compression spring 56 starts releasing the restoring force so as to extend backward by the retracting movement of the operating rod 25, and pulls the chain 57b backward. When the chain 57b is pulled backward, the sprocket 57a rotates so as to unwind the chain 57b, and torque is applied to the cam shaft 41a fitted to the sprocket 57a so as to move the cam groove plane 41c backward. .

  Therefore, the cam 41 fitted in the cam shaft 41a is assisted by the release force of the compression spring 56 together with the pulling force of the operating rod 25 via the movable contact portion 20, the coupling 43, and the link 42, and the cam groove It rotates so that the plane 41c may move back, and the movable contact part 20 and the opposing contact part 10 are separated from each other.

  As described above, in the gas circuit breaker according to the sixth embodiment, the auxiliary biasing body includes the sprocket 57a fitted to the cam shaft 41a of the cam 41, the chain 57b spanned over the sprocket 57a, and one end fixed. The other end is a compression spring 56 fixed to one end of the chain 57b. The compression spring 56 is pulled by the chain 57b by the rotation of the cam 41 in one direction accompanied by the advancement of the opposed contact portion 10 to accumulate a restoring force, and the reverse direction of the cam 41 accompanied by the retraction of the opposed contact portion 10 is achieved. Thus, the restoring force is released, and a torque for rotating the cam 41 in the reverse direction is applied to the cam shaft 41a via the chain 57b and the sprocket 57a.

  As a result, even if the auxiliary biasing body is the sprocket 57a, the chain 57b, and the compression spring 56, the auxiliary biasing body assists the initial movement of the cam 41 that receives a large moment of inertia from the opposing contact portion 10, and the cam 41 Start moving smoothly. For this reason, the opening time of the movable contact portion 20 and the facing contact portion 10 can be shortened such that two-cycle interruption can be realized. Further, the possibility of breakage of the insulating nozzle 23 having a relatively low strength can be reduced.

(Seventh embodiment)
FIG. 13: is a block diagram which shows the gas circuit breaker of 7th Embodiment. As shown in FIG. 13, the gas circuit breaker includes a torsion spring 60 and a rack and pinion mechanism 45 as auxiliary biasing bodies. The rack and pinion mechanism 45 is provided with a rack gear 45a in the opposed contact portion 10, a rack gear 45b in the movable contact portion 20, and a pinion gear 45c that meshes with both rack gears 45a and 45b in the support cylinder 9 so as to be rotatable. It is provided. The pinion gear 45 c has a torsion spring 60 and rotates by the restoring force of the torsion spring 60.

  The torsion spring 60 is stored by the movement of the pinion gear 45c and the follower of the pinion gear 45c accompanying the movement by bringing the opposing contact portion 10 and the movable contact portion 20 close to each other for supplying current. Further, the torsion spring 60 releases the pinion gear 45c by allowing the counter contact portion 10 and the movable contact portion 20 to be spaced apart from each other in order to cut off the current.

  More specifically, the rack gear 45 a extends rearward from the rear end of the opposed energizing contact 12. The rack gear 45a is a pair of long plates and faces each other with a common shaft interposed therebetween. A gear is engraved along the common axis on the plate surface facing the common axis of the rack gear 45a.

  The rack gear 45 b is provided at the tip of the insulating nozzle 23 and extends into the support cylinder 9 toward the opposed contact portion 10. The rack gear 45 b has a cylindrical end portion and is fitted to the insulating nozzle 23. A pair of long plates extend from the base end portion toward the opposed contact portion 10. The long plates face each other across the common shaft, and the plate surface faces the plate surface of the rack gear 45a from the front. A gear is engraved on the plate surface of the rack gear 45b facing the rack gear 45a along the common axis.

  A pinion gear 45c is disposed between the rack gear 45a and the rack gear 45b. The pinion gear 45c is rotatably provided at a fixed point in the support cylinder 9, and meshes with the rack gear 45a and the rack gear 45b, respectively. That is, the rack gear 45a provided in the opposed contact portion 10 and the rack gear 45b provided in the movable contact portion 20 are arranged so as to sandwich the same pinion gear 45c from the opposite side and mesh with the same pinion.

  The torsion spring 60 in the pinion gear 45c has an annular portion fitted to the shaft of the pinion gear 45c, one arm is fixed to the support cylinder 9, and the other arm is fixed to the inner peripheral surface of the pinion gear 45c. . For this reason, when the pinion gear 45c is rotated by an external force, energy is stored, and when the pinion gear 45c is released from the external force, the pinion gear 45c is released and reversely rotates the pinion gear 45c.

  As shown in FIG. 13, in the current application state, the opposed contact portion 10 has moved to the movable contact portion 20 side, and the rack gear 45b has advanced to the opposed contact portion 10 side. Therefore, the pinion gear 45c meshing with the rack gear 45b rotates in the direction in which the rack gear 45b travels. Then, the rack gear 45a opposite to the rack gear 45b across the pinion gear 45c advances to the movable contact portion 20 side. The opposing contact portion 10 having a fixed relationship with the rack gear 45a is also pushed to the movable contact portion 20 side in conjunction with the rack gear 45a.

  At this time, the torsion spring 60 in the pinion gear 45c is stored by receiving the rotation of the pinion gear 45c. In the shut-off operation, the torsion spring 51 starts releasing the restoring force that rotates the pinion gear 45c by the retracting movement of the operating rod 25, and the rack gear 45a fixed to the opposed contact portion 10 is moved from the movable contact portion 20 to the disengagement force. Send it away. Further, the rack gear 45 b fixed to the movable contact portion 20 is sent out in a direction away from the facing contact portion 10.

  Therefore, the movable contact portion 20 and the opposed contact portion 10 are separated from each other by the operating force of the operating rod 25 by the driving device while being assisted by the restoring force of the torsion spring 60 transmitted by the rack and pinion mechanism 45. .

  As described above, in the present embodiment, the transmission mechanism 40 includes the rack gear 45b provided in the movable contact portion 20, the rack gear 45a provided in the opposed contact portion 10, and both the rack gears 45a and 45b. The meshing pinion gear 45c is used. The auxiliary biasing body is a torsion spring 60 provided in the pinion gear 45c, and accumulates restoring force by turning in one direction of the pinion gear 45c accompanied by the advancement of the opposed contact portion 10, so that the opposed contact portion 10 The restoring force is released by the reverse rotation of the pinion gear 45c accompanied by the reverse movement, and the reverse rotation of the pinion gear 45c is assisted.

  As a result, there is no phenomenon that the moment of inertia increases when the cam shaft and the cam roller are far away, the moment of inertia received from the opposed contact portion 10 is constant without increasing, and the initial motion of the cam 41 is caused by the auxiliary biasing body. The cam 41 can be started smoothly. For this reason, the opening time of the movable contact portion 20 and the facing contact portion 10 can be shortened such that two-cycle interruption can be realized. In addition, since the load is not applied to the insulating nozzle 23 in the direction orthogonal to the traveling direction, the possibility of breakage of the insulating nozzle 23 can be reduced.

(Eighth embodiment)
FIG. 14 is a configuration diagram illustrating a gas circuit breaker according to the eighth embodiment. As shown in FIG. 14, this gas circuit breaker includes a tension spring 61 and a rack and pinion mechanism 45 as auxiliary biasing bodies. Since the rack and pinion mechanism 45 has the same configuration and the same function as those of the seventh embodiment, the same reference numerals are given and detailed description thereof is omitted.

  In this gas circuit breaker, the tension spring 61 is located behind the opposed contact portion 10 and further pulls the free end of the rack gear 45a from the rear. A base 58 is provided in the support cylinder 9 behind the rack gear 45a. The base 62 is a base on which the tension spring 61 is installed, and the base surface is orthogonal to the common axis. One end of the tension spring 61 is fixed to the surface of the base 62 facing the opposing contact portion 10 side, and the other end is fixed to the rack gear 45a.

  In the current application state, the opposed contact portion 10 moves to the movable contact portion 20 side, and the rack gear 45a proceeds to the opposed contact portion 10 side. Therefore, the tension spring 61 fixed to the rack gear 45a is stretched beyond the free length and accumulates a restoring force.

  In the shut-off operation, the pulling movement of the operating rod 25 starts releasing the restoring force by which the tension spring 61 pulls the rack gear 45a backward, and the rack gear 45a and the opposing contact portion 10 are separated from the movable contact portion 20. Move to.

  Then, the rotation of the pinion gear 45c along the traveling direction of the rack gear 45a is assisted by the tension spring 61, and the rotation of the pinion gear 45c sends the rack gear 45a away from the opposing contact portion 10 to oppose the movable contact portion 20. It sends out in the direction away from the contact part 10.

  Therefore, the movable contact portion 20 and the opposed contact portion 10 are separated from each other by the operating force of the operating rod 25 by the driving device while being assisted by the restoring force of the tension spring 61 transmitted by the rack and pinion mechanism 45. .

  As described above, in the eighth embodiment, the transmission mechanism 40 is sandwiched between the rack gear 45b provided in the movable contact portion 20, the rack gear 45a provided in the opposed contact portion 10 and both rack gears 45a and 45b. The pinion gear 45c meshed with both sides. The auxiliary biasing body is a tension spring 61 that is fixed at one end to the rack gear 45 a and pulls the opposed contact portion 10 away from the movable contact portion 20, and is moved by the movement of the rack gear 45 a accompanying the advance of the opposed contact portion 10. The restoring force is accumulated by being extended, the restoring force is released by the movement of the rack gear 45a accompanied by the backward movement of the opposed contact portion 10, and the rotation of the pinion gear 45c is assisted by pulling the rack gear 45a.

  As a result, there is no phenomenon that the moment of inertia increases when the cam shaft and the cam roller are far away, the moment of inertia received from the opposed contact portion 10 is constant without increasing, and the initial motion of the cam 41 is caused by the auxiliary biasing body. The cam 41 can be started smoothly. For this reason, the opening time of the movable contact portion 20 and the facing contact portion 10 can be shortened such that two-cycle interruption can be realized. In addition, since the load is not applied to the insulating nozzle 23 in the direction orthogonal to the traveling direction, the possibility of breakage of the insulating nozzle 23 can be reduced.

(Other embodiments)
In the present specification, an embodiment according to the present invention has been described. However, this embodiment is presented as an example, and is not intended to limit the scope of the invention. Combinations of all or any of the configurations disclosed in the embodiments are also included. 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. This embodiment and its modifications are included in the scope of the present invention and the gist thereof, and are also included in the invention described in the claims and the equivalent scope thereof.

2 Sealed container 9 Support cylinder 10 Opposing contact part 11 Opposing arc contact 12 Opposing energizing contact 13 Sliding smooth surface 14 Support 20 Movable contact part 21 Movable arc contact 22 Movable energizing contact 23 Insulating nozzle 24 Cylinder 24a Release Exit 25 Operating rod 27 Piston 28 Piston support 31 Mechanical puffer chamber 40 Transmission mechanism 41 Cam 41a Cam shaft 41b Cam groove 41c Cam groove flat surface 41d Lever surface 41e Cam shaft 42 Link 43 Coupling 44 Cam roller 45 Rack and pinion mechanism 45a Rack gear 45b Rack gear 45c pinion gear 51 torsion spring 52 spiral spring 53 cylindrical case 54 torsion bar 55 adapter 56 compression spring 57 chain mechanism 57a sprocket 57b chain 58 base 59 spring receiver 60 torsion spring 61 tension bar 62 base 70 dampener 71 cylindrical axis 72 yen tube 73 elastic body 81 acting point pin 82 fixed point pin 83 fixed point pins

Claims (11)

A switchgear that switches between conduction and interruption of current,
A first contact portion provided on one side of the electric circuit;
A second contact portion provided on the other electrical path and facing the first contact portion;
An operating rod that is provided in the first contact portion and advances and retracts the first contact portion relative to the second contact portion;
A transmission mechanism for transmitting the driving force of the operating rod through the first contact portion, and for moving the second contact portion in a direction opposite to the advance and retreat of the first contact portion;
The power is accumulated by the advancement of the second contact portion toward the first contact portion, and is released by the retraction of the second contact portion with respect to the first contact portion. An auxiliary biasing body for assisting driving,
Providing
Opening and closing device characterized by. The transmission mechanism is
A link connected to the first contact portion and pushed and pulled in accordance with advancement and retraction of the first contact portion;
A cam that is connected to the link and rotates in response to the push / pull of the link;
A cam roller fixed to the second contact portion and driven by the cam to advance and retract the second contact portion relative to the first contact portion;
Including
The auxiliary biasing body is
A torsion spring in which one arm is connected to the cam and the other arm is fixed;
Accumulating a restoring force by rotating the cam in one direction with the advancement of the second contact portion;
Releasing the restoring force by rotating the cam in the reverse direction with the retraction of the second contact portion, and assisting the rotation of the cam in the reverse direction;
The switchgear according to claim 1. The transmission mechanism is
A coupling extended from the first contact portion to the second contact portion;
The link is connected to the first contact portion through the coupling;
The switchgear according to claim 2. A buffer portion that is provided in the vicinity of the cam and includes an elastic body and that contacts the cam rotated by a predetermined angle or more and restricts rotation;
The switchgear according to claim 2 or 3. The arm to which the torsion spring is fixed is hooked on the buffer portion;
The switchgear according to claim 4. The torsion spring is
The free angle is smaller than the rotation angle of the cam until the blocking is completed, and the cam is detached from the cam during the rotation of the cam;
The switchgear according to any one of claims 2 to 5, characterized in that. The transmission mechanism is
A link connected to the first contact portion and pushed and pulled in accordance with advancement and retraction of the first contact portion;
A cam that is connected to the link and rotates in response to the push / pull of the link;
A cam roller fixed to the second contact portion and driven by the cam to advance and retract the second contact portion relative to the first contact portion;
Including
The auxiliary biasing body is
A spiral spring wound around the cam shaft of the cam;
The cam is wound around the camshaft by one-way rotation of the cam with the advancement of the second contact portion, and a restoring force is accumulated.
The cam is unwound by the reverse rotation of the cam accompanying the retraction of the second contact portion to release the restoring force, and the cam is rotated in the reverse direction by the cam shaft. Giving torque,
The switchgear according to claim 1. The transmission mechanism is
A link connected to the first contact portion and pushed and pulled in accordance with advancement and retraction of the first contact portion;
A cam that is connected to the link and rotates in response to the push / pull of the link;
A cam roller fixed to the second contact portion and driven by the cam to advance and retract the second contact portion relative to the first contact portion;
Including
The auxiliary biasing body is
A torsion bar fitted to the cam shaft of the cam;
Storing the restoring force by being twisted by the rotation of the cam accompanying the progress of the second contact portion,
Twisting is eliminated by rotation of the cam accompanied by the retraction of the second contact portion to release a restoring force, and a torque for rotating the cam in the reverse direction is applied to the cam shaft;
The switchgear according to claim 1. The transmission mechanism is
A link connected to the first contact portion and pushed and pulled in accordance with advancement and retraction of the first contact portion;
A cam that is connected to the link and rotates in response to the push / pull of the link;
A cam roller fixed to the second contact portion and driven by the cam to advance and retract the second contact portion relative to the first contact portion;
Including
The auxiliary biasing body is
A sprocket fitted to the camshaft of the cam;
A chain spanning the sprocket;
A compression spring having a free end fixed to one end of the chain;
Including
The compression spring is
The second contact portion is pulled by the chain by one-way rotation of the cam accompanying the advancement, and accumulates a restoring force,
Torque for releasing the restoring force by the reverse rotation of the cam accompanied by the retraction of the second contact portion and rotating the cam in the reverse direction to the cam shaft via the chain and the sprocket Giving,
The switchgear according to claim 1. The transmission mechanism is
A first rack gear provided in the first contact portion;
A second rack gear provided in the second contact portion;
A pinion gear sandwiched between the first rack gear and the second rack gear and meshing with both;
Including
The auxiliary biasing body is
A torsion spring provided in the pinion gear;
Accumulating restoring force by rotation of the pinion gear in one direction with the progression of the second contact portion;
Releasing the restoring force by the reverse rotation of the pinion gear accompanied by the retreat of the second contact portion, and assisting the reverse rotation of the pinion gear;
The switchgear according to claim 1. The transmission mechanism is
A first rack gear provided in the first contact portion;
A second rack gear provided in the second contact portion;
A pinion gear sandwiched between the first rack gear and the second rack gear and meshing with both;
Including
The auxiliary biasing body is
A tension spring having one end fixed to the second rack gear and pulling the second contact portion away from the first contact portion;
It is expanded by the movement of the second rack gear accompanying the advance of the second contact portion and accumulates a restoring force,
Releasing the restoring force by the movement of the second rack gear accompanying the retraction of the second contact portion, and assisting the rotation of the pinion gear by pulling the second rack gear;
The switchgear according to claim 1.

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