JP6585485B2 - Gas circuit breaker - Google Patents

Description

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

  Switchgears such as gas circuit breakers are used to cut off accidental currents and small currents generated in the power system and protect the power transmission network, and gas breakers are particularly popular. As the gas circuit breaker, a so-called puffer type that cuts off a current by blowing a compressed gas to an arc generated between electrodes by using an arc extinguishing gas pressure increase during the opening operation is generally used.

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

  A puffer type circuit breaker is known as one that uses arc heat to form the blowing pressure, and is provided with a fixed volume thermal expansion chamber and used in combination with a mechanical compression chamber that reduces the volume when the electrode is opened.

  In order to improve the breaking performance of the puffer-type gas circuit breaker, it is necessary to increase the opening speed, but it is necessary to increase the operating energy of the operating device, which increases the size of the device and increases costs. It becomes.

  Therefore, there is a bidirectional driving method that can reduce the operation energy by relatively reducing the driving distance of the driving side electrode by driving the arc electrode on the driven side, which has been fixed conventionally, in the direction opposite to the opening direction. Proposed. For example, a drive system using a fork-type lever has been proposed (Patent Document 1). This method is to drive the arc contact by fixing the driven main contact, and the fork-type lever rotates by contacting the pin in conjunction with the movement of the drive side electrode in the fork recess, By converting this to reciprocation in the opening and closing direction, the driven-side arc electrode is driven in a direction opposite to the driving direction of the driving-side electrode.

  As another drive method, the drive side electrode and the driven side electrode are connected to the groove cam provided on the rotary lever via a link and a pin, and the link operation when the drive side electrode is opened / closed is controlled by rotating the lever. A method of converting and operating the driven side electrode in a direction opposite to the driving side electrode has also been proposed (Patent Document 2). In this method, the stop of the lever rotation at the end of the opening / closing operation is performed by applying the lever to the buffer structure.

US Pat. No. 6,271,494 Japanese Patent Laying-Open No. 2015-72817

  In Patent Literature 1, strength reliability is an issue with respect to inertial force acting on a pin when the pin hits a fork-type lever or when the operation of the driven electrode is stopped. In order to solve the problem, it is necessary to increase the pin diameter in the same way, and the enlargement of the fork lever and the enlargement of the entire bidirectional mechanism are problems.

In Patent Document 2, since the lever is stopped against the buffer structure when the opening / closing operation is stopped, a part of the impact load due to the inertial force during the blocking operation is absorbed by the buffer structure, and the stress generated on the pin is reduced. It becomes possible. However, the buffer structure of the present system has a circular cross-sectional shape in a direction orthogonal to the opening / closing direction. For this reason, the contact area between the lever and the buffer structure is reduced, the surface pressure at the time of contact is increased, and there is a possibility that the lever and the buffer structure are brought to an early stage. The buffer structure is attached to the sealed container. For example, when a bolt is used for attaching the shock absorbing structure to the sealed container, it is fastened in a direction orthogonal to the opening / closing direction, that is, the axial direction of the shock absorbing structure. Therefore, since the bolt bears the impact load transmitted when the lever is received in the shear direction with low strength, the strength reliability of the bolt becomes a problem. Also. Since it is necessary to remove the buffer structure at the time of maintenance of the circuit breaker and the bidirectional drive mechanism, a decrease in maintainability is also an issue.

In view of the above points, an object of the present invention is to provide a gas circuit breaker equipped with a bidirectional drive mechanism that can achieve both high structural reliability and miniaturization during operation.

According to the solution of the present invention,
A gas circuit breaker,
A drive side electrode having a drive side main electrode (2) and a drive side arc electrode (4), connected to the operating device (1) and provided in the sealed tank (100);
A driven side electrode having a driven side main electrode (3) and a driven side arc electrode (5) and provided in the sealed tank (100) facing the driving side electrode;
A bidirectional drive mechanism (10);
With
The bidirectional drive mechanism (10)
A drive side connecting rod (11) for receiving a drive force from the drive side electrode;
A driven side connecting rod (13) connected to the driven side arc electrode (5) ;
A guide (14) for holding the driving side connecting rod (11) and the driven side connecting rod (13) so as to move in a translational manner;
Arranged on both outer sides of the guide (14), rotatably fixed to each other by lever fixing pins (15), connecting the driven side connecting rod (13) and the driving side connecting rod (11), Two levers (12) for operating the driven side connecting rod (13) in opposite directions with respect to the operation of the driving side connecting rod (11);
There is provided a gas circuit breaker having a buffer structure (40) fixed to the guide (14) so as to come into contact with the driven side connecting rod (13) at the end of the blocking operation.

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

Detailed view of the cross section of the bidirectional drive mechanism of the gas circuit breaker according to the embodiment of the present invention The figure which shows the state before the collision of buffer structure sectional drawing of the bidirectional | two-way drive mechanism part of the gas circuit breaker which concerns on embodiment of this invention, and driven side connecting rod sectional drawing The cross-sectional view of the interference structure of the bidirectional drive mechanism of the gas circuit breaker according to the embodiment of the present invention and the state after the collision of the driven side connecting rod The figure which shows the injection state of the gas circuit breaker which concerns on embodiment of this invention The disassembled perspective view of the bidirectional | two-way drive mechanism part of the gas circuit breaker which concerns on embodiment of this invention Stroke characteristic diagram of gas circuit breaker according to an embodiment of the present invention The figure which shows the state just before operation | movement of the driven side arc electrode in the middle of interruption | blocking of the gas circuit breaker which concerns on embodiment of this invention. The figure which shows the state immediately after the drive side movable pin reaches the connection part of a 1st groove | channel cam in the middle of opening of the gas circuit breaker which concerns on embodiment of this invention, and the operation | movement of a to-be-driven side arc electrode starts. In the middle of the opening of the gas circuit breaker according to the embodiment of the present invention, before the drive side movable pin passes through the connecting portion of the first groove cam, it is the final stage of the operation of the driven side arc electrode, and the contact of the driven side rod The figure which shows the state just before the surface and the contact surface of the contact plate of a buffer structure contact In the middle of opening of the gas circuit breaker according to the embodiment of the present invention, immediately after the drive side movable pin passes through the connecting portion of the first groove cam, the contact surface of the driven side rod and the contact surface of the buffer structure pad Is in contact with the driven-side arc electrode, and shows a state where the operation has been completed. The figure which shows the opening state of the gas circuit breaker which concerns on embodiment of this invention The schematic diagram of the impact load which acts on a drive side movable pin, a driven side movable pin, and a lever at the time of driving stop of a driven side electrode of a gas circuit breaker concerning an embodiment of the present invention The schematic diagram of the bending displacement and impact load which act on a drive side movable pin at the time of the drive stop of the driven side electrode of the gas circuit breaker which concerns on embodiment of this invention The schematic diagram of the bending displacement and impact load which act on a driven side movable pin at the time of the drive stop of the driven side electrode of the gas circuit breaker which concerns on embodiment of this invention Sectional drawing which shows the state which clamped the elastic body with the light-shielding material, the heat insulating material, and the antiseptic | preservative between the cover plate and the end plate in the buffer structure of the bidirectional | two-way drive mechanism part of the gas circuit breaker which concerns on embodiment of this invention.

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

  In FIG. 4, the injection state of the gas circuit breaker in embodiment of this invention is shown.

  A driving electrode and a driven electrode are provided coaxially facing each other in the sealed container 100. The driving side electrode has a driving side main electrode 2 and a driving side arc electrode 4, and the driven electrode has a driven side main electrode 3 and a driven side arc electrode 5.

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

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

  As shown in FIG. 4, the gas circuit breaker is set to a position where the driving side main electrode 2 and the driven side main electrode 3 are electrically connected to each other by the hydraulic pressure of the operating device 1 or a driving source by a spring in the on state. The power system circuit is configured.

  When interrupting a short-circuit current due to lightning or the like, the operating device 1 is driven in the opening direction, and the driving side main electrode 2 and the driven side main electrode 3 are separated through the shaft 6. At that time, an arc is generated between the driving side arc electrode 4 and the driven side arc electrode 5. The generated arc is extinguished by mechanical arc extinguishing gas blowing by the mechanical compression chamber 7 and arc extinguishing gas blowing using the arc heat by the thermal expansion chamber 9 to cut off the current.

In order to reduce the operation energy of the puffer-type gas circuit breaker, a bidirectional drive mechanism unit 10 for driving the driven-side arc electrode 5 fixed in the past in the direction opposite to the drive direction of the drive-side electrode is provided.
Hereinafter, the bidirectional driving method according to the embodiment of the present invention will be described with reference to FIGS.

FIG. 2 is a view showing a state before the collision of the buffer structure sectional view and the driven side connecting rod sectional view of the bidirectional drive mechanism of the gas circuit breaker according to the embodiment of the present invention. FIG. 3 is a cross-sectional view of the interference structure of the bidirectional drive mechanism portion of the gas circuit breaker according to the embodiment of the present invention and a state after the driven side connecting rod collides. FIG. 4 is a diagram illustrating a state in which the gas circuit breaker according to the embodiment of the present invention is turned on. FIG. 5 is an exploded perspective view of the bidirectional drive mechanism of the gas circuit breaker according to the embodiment of the present invention.
As shown in FIGS. 1, 2, 3, 4, and 5, the bidirectional drive mechanism unit 10 engages the drive side connecting rod 11 and the driven side connection rod 13 with a guide 14 that is divided in two. Thus, the guides 14 are configured to be connected to the respective guides 14 by levers 12 that are rotatably provided via lever fixing pins 15 while being held movably in the driving operation direction.

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

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

  As shown in FIG. 1, the guide 14 has a second groove cam 17 that is equal to the vertical width of the first groove cam 16 and is formed of, for example, a curve. The shape of the second groove cam 17 is not limited to a curved line, and can be changed as appropriate according to the shutoff operation characteristics. As shown in FIG. 1, the first groove cam 16 and the second groove cam 17 have a laminated structure in the X-axis direction, and a drive side movable pin 18 is communicated with an overlapping portion of both groove cams so that it can move freely. Connected.

  Further, the drive side movable pin 18 is passed through the third groove cam 19 cut into the lever 12, and the lever 12 rotates with the lever fixing pin 15 as the rotation axis. At this time, the drive-side movable pin 18 moves while rolling the second groove cam 17 in one direction when moving on the connecting portion 16B of the first groove cam. By the movement in one direction of the drive side movable pin 18, a force acts on one side of the inner wall of the third groove cam 19, and the rotation direction of the lever 12 is defined. In addition, the shape of the 3rd groove cam 19 is not specifically limited, According to interruption | blocking operation characteristic, it can change suitably. The lever driven side guide hole 21 cut into the lever 12 by this rotational movement transmits a force to the driven side movable pin 20 attached to the driven side connecting rod 13 so that the driven side arc electrode 5 and The driven side connecting rod 13 to be connected is driven in the opposite direction to the driving side connecting rod 11.

  As shown in FIGS. 2, 3, and 5, the buffer structure 40 has a contact plate 42, an elastic body 41, and an end plate 43 arranged on the same axis in the Y-axis direction from the blocking portion side. It is configured to be sandwiched and fastened in the Y-axis direction.

  The buffer structure 40 and the guide 14 are provided on the guide 14 so that the contact surface 13A of the driven side connecting rod 13 and the abutting surface 42A of the abutting plate 42 are concentric with the driven side connecting rod 13 in the Y-axis direction. The fixing bolt hole 14 </ b> C is fastened with a fixing bolt 46 through a flange through hole 43 </ b> A provided in the end plate 43. Since the buffer structure 40 is exposed to the corrosive gas environment in which the arc extinguishing gas in the sealed container 100 and the sulfide generated by the decomposition of the sulfur hexafluoride gas that is the arc extinguishing gas after the shut-off operation are mixed. The elastic body 41 is sealed by the contact plate 42, the end plate 43, and the guide 14 to prevent a decrease in energy absorption performance due to deterioration of the elastic body 41. In the present embodiment, it is not excluded that the whole or a part of the elastic body 41 is exposed to the arc extinguishing gas or corrosive gas environment or is ventilated in the sealed container 100. The axial direction of the fixing bolt 46 is preferably fastened so as to coincide with the Y-axis direction as the driving direction. The buffer structure 40 is fastened to the guide 14 with the fixing bolt 46, so that the bidirectional drive mechanism unit 10 can be downsized and improved in maintenance. The above-described fastening method between the buffer structure 40 and the guide 14 is an example, and the strength reliability and maintenance performance of the fastening bolt may be reduced. However, the axial direction of the fixing bolt 46 coincides with the drive shaft direction. It is not excluded to use an adhesive or welding for mounting at an angle that does not occur or for connecting the buffer structure 40 and the guide 14. Further, the buffer structure 40 may be fixed to the guide 14 via some support member, or to one or more members other than the guide 14 or to a plurality of members including the guide 14.

  Next, the principle of shock load absorption in the blocking operation by the buffer structure 40 will be described. As shown in FIG. 2, the contact surface 42 </ b> A of the buffer structure 40 and the contact surface 13 </ b> A of the driven side connecting rod 13 are from the stop of the operation of the driven side connecting rod 13 in the closing state or opening operation to an arbitrary stroke. There is no contact. As shown in FIG. 3, the elastic body 41 is in contact with the contact plate 42 </ b> A and the contact surface 13 </ b> A during the opening operation from the arbitrary stroke before the driven side connecting rod 13 stops operating until the operation stops. Is displaced within the elastic region and absorbs all or part of the impact load. The amount of energy absorbed with respect to the impact load can be adjusted by changing the material and volume of the elastic body 41. The stroke of the driven side connecting rod 13 in which the contact plate 42A and the contact surface 13 are in contact with each other changes the volume of the driven side connecting rod 13, the elastic body 41, the contact plate 42, the end plate 43, the end plate 43 and the nut 45, or the guide. It can be adjusted by the spacer arrangement between 14.

Connecting the two-way drive mechanism 10 and the driving side electrode, for example, the fastening ring 22 attached to the nozzle 8, a hole which the tip portion of the drive coupling rod 11 penetrates the fastening ring 22, the drive-side fastening bolt 23 To be tightened with a nut.

5, as an exploded perspective view of a bi-directional drive mechanism 10 in the embodiment of the present invention shown, the lever 12 is attached two the same shape on the outside of the guide 14. In the operation of the bidirectional drive mechanism 10 of the present embodiment, the load acting on the lever 12 is large, by installing the lever 12 on the outside of the unconstrained guide 14 in the space, increasing the thickness and width of the lever Thus, the stress of the lever 12 can be relaxed.

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

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

  The lever fixing pins 15 are attached to both ends with fixing rings (not shown) so as not to be detached from the guide 14. Further, the drive side movable pin fastening bolts 26 and the driven side movable pin fastening bolts 28 cut at both ends are arranged so that the drive side movable pin 18 and the driven side movable pin 20 are not detached from the guide 14. 27. Tighten with driven side drive pin fixing nuts 29, respectively.

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

  Hereinafter, with reference to FIG. 6 to FIG. 11, about the state during the breaking operation that becomes the opening and reduction of the impact load acting on the driving side movable pin and the driven side movable pin when the driving side electrode is stopped by the buffer structure 40 explain. First, the state during the blocking operation will be described below.

  FIG. 6 is a diagram in which time is taken on the horizontal axis, and driving side electrode stroke and driven side electrode stroke are taken on the vertical axis.

  For each operating state of the gas circuit breaker, time a is the start time of the blocking operation, as shown in FIG. As described in detail below, time b is shown in FIG. 7, time c is shown in FIG. 8, time d is shown in FIG. 9, time e is shown in FIG. 10, and time f is shown in FIG.

  The drive-side electrode stroke shown in FIG. 6 constantly varies from the on state to the shut-off state, that is, from time a to time f. On the other hand, the driven stroke varies only from time b to time e. In other words, the driven-side arc electrode 5 operates only during the time when the driving-side movable pin 18 passes through the connecting portion 16B of the first groove cam during the time when the driving-side arc electrode 4 is driven. This state is called intermittent driving.

Here, the stroke at which the shock absorbing structure 40 absorbs the impact load is defined as the time d ′ when the contact surface 13A of the driven side connecting rod 13 and the contact surface 43A of the shock absorbing structure 40 start contact, and the driving side arc electrode The driven side stroke up to the operation time e of 5 is defined as the drive energy absorption stroke δ _d'e of the buffer structure 40. The driving energy absorption stroke δ _d'e can be arbitrarily changed depending on the volume of the buffer structure 40 and the fixing method.

(Time b)
FIG. 7 is a view showing a state immediately before the driven-side arc electrode 5 is operated. Although the driving side arc electrode 4 is driven, the driven side arc electrode 5 is stationary because the driving side movable pin 18 is located in the range of the connecting portion 16C of the first groove cam.

(Time c)
FIG. 8 shows a state in which the driving side movable pin 18 reaches the connecting portion 16B of the first groove cam and immediately after the operation of the driven side arc electrode 5, that is, the driving side arc electrode 4 and the driven side arc electrode 5 are opened. FIG. At this time, the drive side movable pin 18 reaches the connecting portion 16B of the first groove cam 16 and simultaneously moves in the second groove cam 17 and the third groove cam 19 in one direction.

(Time d)
FIG. 9 shows that the driven side arc electrode 5 is in the final stage before the driving side movable pin 18 passes through the connecting portion 16B of the first groove cam 16, and the contact surface 13A of the driven side connecting rod 13 and the buffer structure 40 are shown. It is a figure which shows the state immediately before 42 A of contact surfaces of the contact plate 42 contact. At this time, the movable pin 18 moves in the second groove cam 17 and the third groove cam 19 in one direction simultaneously with the movement of the connecting portion 16B of the first groove cam 16.

(Time e)
FIG. 10 is a diagram illustrating a state in which the operation of the driven-side arc electrode 5 has been completed. At this time, the drive side movable pin 18 moves in the second groove cam 17 and the third groove cam 19 at the same time as it reaches the first linear portion 16A immediately after passing through the connecting portion 16B of the first groove cam. At this time, the contact surface 13A of the driven side connecting rod 13 and the contact surface 42A of the contact plate 42 of the buffer structure 40 are in contact with each other.

(Time f)
FIG. 11 is a diagram illustrating a blocking state. The operation of the driving side arc electrode 4 is completed and a cut-off state is reached, and the driving side arc electrode 4 and the driven side arc electrode 5 are stationary.

  The operation of the drive-side movable pin 18 and the lever 12 in FIGS. 7 to 11 will be described. The drive-side movable pin 18 is in the second linear portion from the start of the blocking operation at time a in FIG. 4 until the state of FIG. 16C is moved and the lever 12 is stationary. In the state of FIGS. 8 and 9, the drive side movable pin 18 moves on the connecting portion 16 </ b> B, and the lever 12 rotates with the lever fixing pin 15 as a fulcrum. 10 and 11, the movable pin 18 moves on the first linear portion 16A, and the lever 12 is stationary.

  As shown in FIGS. 8 and 9, when the drive side movable pin 18 moves on the connecting portion 16 </ b> B, the drive side movable pin 18 moves the second groove cam 17 and the third groove cam 19 in one direction. The lever 12 is rotated with the lever fixing pin 15 as a fulcrum.

  In the shut-off operation that transitions in the order of FIGS. 7 to 11, the drive side movable pin 18 moves the second straight portion 16 </ b> C, the connecting portion 16 </ b> B, and the first straight portion 16 </ b> A in one direction. On the other hand, in the closing operation that changes in the order of FIG. 11 to FIG. 7, the drive side movable pin 18 moves the first straight portion 16A, the connecting portion 16B, and the second straight portion 16C in one direction.

  As described above, when the driving side movable pin 18 holds the position of the lever 12 by the second groove cam 17 at the connecting portion 16B of the first groove cam, the lever 12 is rotated in one direction to drive the driven side arc electrode 5. Is driven in the opposite direction to the drive side arc electrode 4, and the operation of the movable pin 18 is restricted by the second groove cam 17 and the third groove cam 19 at the first linear portion 16 </ b> A of the first groove cam 16. Stops turning. Thereby, the intermittent drive state in which the driven-side arc electrode 5 is stationary is realized.

  Next, the impact load acting on the drive side movable pin 18 and the drive side movable pin 20 at the drive stop time e of the driven side arc electrode 5 shown in FIG. 10 and the reduction of the impact load by the buffer structure 40 will be described.

  In the present embodiment, as shown in FIG. 1, the drive side movable pin 18 and the driven side movable pin 20 are not fixed to any part. Except for the time b, the excessive force acting on the drive side movable pin 18 and the driven side movable pin 20 can be alleviated in the entire range from the operation time a to the time f, so that a highly reliable bidirectional drive mechanism can be realized. .

FIG. 12 is a schematic diagram of an impact load that acts on the drive side movable pin, the driven side movable pin, and the lever when driving of the driven side electrode of the gas circuit breaker according to the embodiment of the present invention is stopped.
At time e during the shut-off operation, as the driven-side arc electrode 5 stops operating, the lever 12 stops rotating as shown in FIG. 12, and the inertia acts on the driving-side movable pin 18 and the driven-side movable pin 20, respectively. force, the third grooved cam impingement point 19B of the drive-side movable pin collision point 18B of the drive-side movable pin 18 and the third groove cam 19 collide, the impact load F ₁ and reaction force R ₁ is generated. Similarly, an impact load F ₂ and a reaction force R ₂ are generated between a driven side movable pin collision point 20 B of the driven side movable pin 20 and a lever driven side guide hole collision point 21 B of the lever driven side guide hole 21. To do. The impact load F ₁ and reaction force R ₁ and the impact load F ₂ and reaction force R ₂ are generated by the levers 12 at both ends.

FIG. 13 schematically shows the displacement δ ₁ generated in the drive side movable pin 18 and the impact load F ₁ ′ generated in the drive side movable pin 18 due to the reaction force R ₁ generated in the levers 12 at both ends. Show. A displacement δ ₁ is generated in the driving side movable pin 18 with the reaction force R ₁ generated by the levers 12 at both ends as a fulcrum. Due to the displacement δ ₁ , the driving side movable pin 18 and the driving side connecting rod 11 collide at the driving side collision point 16B ′, and the load F ₁ ′ is generated impactively. The driving side movable pin 18 is subjected to impact stress due to the load F ₁ ′, which may cause a decrease in strength reliability of the driving side movable pin 18. The load F ₁ ′ is a component force of the angular difference θ ₁ between the driving side movable pin collision point 18B and the driving side collision point 16B ′ in the total reaction force R ₁ generated by each lever, and 2 × R ₁ cos. (θ ₁ ).

FIG. 14 shows the displacement δ ₂ generated in the driven side movable pin 20 and the load generated in the driven side movable pin 20 due to the impact load F ₂ and the reaction force R ₂ generated in the levers 12 at both ends. F ₂ ′ is schematically shown. A displacement δ ₂ is generated on the driven movable pin 20 with the reaction force R ₂ generated by the levers 12 at both ends as a fulcrum. Due to the displacement δ ₂ , the driving side connecting rod guide groove 30 collides at the driven side collision point 30 ′, and the load F ₂ ′ is generated impactively. The driven side movable pin 20 is subjected to impact stress due to the load F ₂ ′, which causes a decrease in strength reliability of the driven side movable pin 20. The load F ₂ ′ is a component force of the angular difference θ ₂ between the lever driven side guide hole collision point 21B and the driven side collision point 30 ′ in the total reaction force R ₂ generated by each lever, and 2 × R ₂ cos (θ ₂ ).

Impact load F ₁ and impact load F ₂ can be reduced by placing as showing the cushioning structure 40 in FIGS. 1 to 5 and the like. As shown in FIG. 6, before the stroke [delta] _d'e the contact surface 42A of the contact surface 13A with the buffer structure 40 of the driven-side connecting rod 13 from the time e an impact load is generated, by contacting at time d 'Stroke between [delta] _d'e, absorb driving energy in the buffer structure 40, the impact load F ₁ acting on the drive side movable pin 18 at time e, reduce respectively the impact load F ₂ acting on the driven side movable pin 20 Thus, the bending stress generated at the time e on the driving side movable pin 18 and the driven side movable pin 20 can be reduced. Note that the contact between the contact surface 13A and the contact surface 42A is preferably uniform and equal in consideration of energy transmission and the sag of the buffer structure. However, this embodiment does not exclude the uneven contact between the contact surface 13A and the contact surface 42A. Further, the areas of the contact surface 13A and the contact surface 42A may be the same or different.

The absorption of the driving energy during the stroke δ _d'e by the buffer structure 40 is transmitted to the elastic body 41 through the contact plate 42 and absorbed. The stroke δ _de is equal to or less than the operation stroke of the driven electrode, and the stroke δ _d'e can be arbitrarily changed according to the cutoff performance, the stroke characteristics, and the target absorbed energy amount. Further, the fastening force of the elastic body 41, the contact plate 42, and the end plate 43 by the through bolt 44 and the nut 45 can be arbitrarily set according to the target energy absorption amount and the stroke δ _d'e . The present embodiment does not exclude the use of, for example, rivet fastening, adhesion, welding, caulking, or interference fitting instead of bolts for connection of the elastic body 41, the contact plate 42, and the end plate 43.

  As a material of the elastic body 41, for example, a rubber material or a resin material having a high damping ability can be used. In addition, as long as Vickers hardness is low with respect to the contact plate 42 and the end plate 43, any material, for example, a metal material such as a steel material (iron material), a stainless steel material, an aluminum material, a copper material, a titanium material, a carbon-based material, A glass-based composite material may be used. The elastic body 41 may be composed of a single material or part, or may be composed of a plurality of materials or parts. Moreover, you may use the damper using some electrical controls, such as a coil spring, an air damper, a hydraulic damper, and a solenoid manufactured with all materials.

  The material of the contact plate 42 is preferably the same as the driven rod 13 and the contact surface 13A, the same kind of material, or a material having an equivalent value in Vickers hardness, for example, a metal material such as a steel material. The contact plate 42 may be composed of a single component or material, or may be composed of a plurality of components or materials.

  The material of the end plate 43 is preferably the same as the driven rod 13 and the contact surface 13A, the same type of material, or a material having an equivalent value in Vickers hardness, for example, a metal material. The end plate 43 may be composed of a single component or material, or may be composed of a plurality of components or materials.

  Note that the contact surface 13A, the contact surface 42A, or the contact plate 42 and the end plate 43 may be subjected to post-processing such as quenching, nitriding, or plating.

  FIG. 15 shows another embodiment of the buffer structure 40. The buffer structure 40 is exposed to a corrosive gas environment in which the arc extinguishing gas in the sealed container 100 and sulfides generated by the decomposition of sulfur hexafluoride gas that is the arc extinguishing gas after the shut-off operation are mixed. In addition, it is exposed to arc light and high heat during the interruption operation. In such an environment, particularly when a rubber material or a resin material is used for the elastic body 41, a decrease in energy absorption performance due to deterioration of the elastic body 41 becomes a problem.

As shown in FIG. 15, by covering the periphery of the elastic body 41 with a light shielding film 41A, a heat insulating material 41B, and a corrosion-resistant body 41C, the energy absorption performance of the elastic body 41 is prevented from being lowered with respect to the above-described problems. be able to. In this embodiment, the outer peripheral portion of the elastic body 41 is laminated in the order of the light shielding film 41A, the heat insulating material 41B, and the corrosion resistant body 41C. However, the order of lamination of the light shielding film 41A, the heat insulating material 41B, and the corrosion resistant body 41C is arbitrary. It can be set. Moreover, you may laminate | stack only the single-piece | unit or partial combination in any one of the light shielding film 41A, the heat insulating material 41B, and the corrosion-resistant body 41C.
You may comprise the light shielding film 41A, the heat insulating material 41B, and the corrosion-resistant body 41C in the contact plate 42 and the end plate 43. FIG. The corrosion resistant body 41C is preferably stainless steel. In addition, for example, any of a resin material, an aluminum material, an iron material, a copper material, a titanium material, a carbon-based composite material, and a glass-based composite material may be used as the material of the corrosion-resistant body 41C. In addition to the various materials as described above, the elastic body 41 may be a damper using any electrical control such as a coil spring, an air damper, a hydraulic damper, or a solenoid made of any material.

  In the present embodiment, the shock absorbing structure 40 is applied to the terminal end of the driven side connecting rod 13 with respect to the shut-off operation to absorb all or part of the impact load acting on the driving side movable pin 18 and the driven side movable pin 20. However, in order to reduce the impact load acting on the drive-side movable pin 18 and the driven-side movable pin 20 in the closing operation, the buffer structure 40 is buffered at the end of the drive-side connecting rod 11 and the start end of the driven-side connecting rod 13. It does not exclude fixing the structure 40.

  According to this embodiment, it is possible to realize a bidirectional drive mechanism that achieves both high strength reliability and downsizing with respect to an impact load generated on the drive side movable pin 18 and the drive side movable pin 20 when driving of the driven side electrode is stopped. In addition, the above is an example to the last, and is not intended to limit the content of the invention to the specific embodiment. The invention itself can be carried out in various modes according to the contents described in the claims. In the embodiment, an example of a circuit breaker having a mechanical compression chamber and a thermal expansion chamber has been described. However, the present invention can be applied to, for example, a circuit breaker having only a mechanical compression chamber. Further, the present invention can also be applied to a driven side electrode other than the groove cam, for example, a fork type lever type, a link type or a lever type driven electrode.

[Configuration example]
In the present embodiment, for example, a driving side electrode and a driven side electrode are provided facing each other in the sealed container 100, and the driving side electrode includes a driving side main electrode 2 and a driving side arc electrode 4, and the driven side The electrodes include a driven side main electrode 3 and a driven side arc electrode 5, the driving side arc electrode 4 is connected to the operating device 1, and the driven side arc electrode 5 is connected to the bidirectional driving mechanism unit 10. The bidirectional driving mechanism 10 includes a driving side connecting rod 11 that receives a driving force from the driving side electrode, a driven side connecting rod 13 that is connected to the driven side arc electrode 5, and the driving side connecting rod. A lever 12 for moving the driven side connecting rod 13 in the opposite direction to the operation of 11, a guide 14 for defining the operation of the driving side connecting rod 11 and the driven side connecting rod 13,
A contact surface 13A of the driven side connecting rod 13 and a contacting surface 42A of the backing plate 42 are connected to the guide 14 via a flange 43A provided on the end plate 43 by a fixing bolt 46 with the buffer structure 40. The elastic body 41 is fastened so as to contact the load at the end of the driving in the interruption of 13 and to bear the load at the time of collision in the axial direction of the fixing bolt 46. The drive side movable pin 18 is communicated with each of the first groove cam 16 of the drive side connecting rod 11 and the second groove cam 17 of the lever 12. The drive-side movable pin 18 moves in the first groove cam 16 and the driven-side connection rod guide groove 30 by the operation of the drive-side connection rod 11, thereby The driven side connecting rod 13 communicated with the lever 12 by the driven side movable pin 20 is driven in a direction opposite to the driving side connecting rod 11, and the driven side connecting rod 13 is rotated. The driven-side arc electrode 5 to be connected is driven in a direction opposite to the driving-side arc electrode 4 of the driving-side electrode connected to the driving-side connecting rod 11, and the contact surface 13 </ b> A of the driven-side connecting rod 13 is driven. One of the features is that the contact surface 42A of the contact plate 42 of the buffer structure 40 is brought into contact with and stopped at the time of a shut-off operation.

[Effect of Example]
According to this embodiment, a part of the impact load acting on the drive side movable pin and the driven side movable pin is brought about by bringing the driven side connection rod into contact with the buffer structure when driving is stopped when the driven side connection rod is shut off. Therefore, it is possible to increase the reliability of the driving side movable pin and the driven side movable pin and to reduce the size of the bidirectional driving mechanism. Moreover, the circuit breaker maintenance performance is improved by attaching the buffer structure to the guide. The fastening bolts can also be attached so that the load is borne in the direction of the bolt shaft with high strength by fastening the bolts in accordance with the direction of the impact load acting on the buffer structure. it can.

[Appendix]
In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 ... Operating device, 2 ... Drive side main electrode, 3 ... Driven side main electrode, 4 ... Drive side arc electrode, 5 ... Driven side arc electrode, 6 ... Shaft 7 ... mechanical compression chamber, 8 ... nozzle, 9 ... thermal expansion chamber, 10 ... bidirectional drive mechanism, 11 ... drive-side connecting rod, 12 ... lever, center Axis 12c ... center axis, 13 ... driven side connecting rod, 13A ... contact surface 14 ... guide, 14A ... upper groove, 14B ... lower groove, 14C ... fixing bolt hole, 15 ... lever fixing pin, 16 ... first groove cam, 16A ... first linear part, 16B ... connecting part, 16B '... driving side collision point, 16C ... second linear part, 17 ... ..Second groove cam, 18 ... drive side movable pin, 18B ... drive side movable pin collision point, 19 ... third groove cam, 19B ... third groove cam collision point, 20 ... driven side movable pin, 20B ... driven side movable pin collision point, 21 ... lever driven side guide hole, 21B ... lever driven Side guide hole collision point, 22 ... fastening ring, 23 ... drive side fastening bolt, 25 ... hole, 26 ... drive side movable pin fastening bolt, 27 ... drive side movable pin fixing nut, 28 ... driven side drive pin fastening bolt, 29 ... driven side movable pin fixing nut, 30 ... driven side connecting rod guide groove, 30 '... driven side collision point, 40 ... Buffer structure, 41 ... elastic body, 41A ... light shielding film, 41B ... heat insulating material, 41C ... corrosion resistant body, 42 ... padding plate, 42A ... padding surface, 43 ... -End plate, 43A ... Flange through hole, 44 ... Through bolt, 45 ... Nut, 46 ... fixing bolt, 100 ... sealed container

Claims (15)

A gas circuit breaker,
A drive-side electrode having a drive-side main electrode and a drive-side arc electrode, connected to an operating device, and provided in a sealed tank;
A driven-side electrode having a driven-side main electrode and a driven-side arc electrode, and provided in the sealed tank facing the driving-side electrode;
A bidirectional drive mechanism,
With
The bidirectional driving mechanism portion,
A driving side connecting rod that receives a driving force from the driving side electrode;
A driven-side connecting rod connected to the driven-side arc electrode ;
A guide for holding the driving side connecting rod and the driven side connecting rod so as to move in a translational manner inside;
Arranged on both outer sides of the guide and fixed to each other rotatably by lever fixing pins, connecting the driven side connecting rod and the driving side connecting rod, and driving the driven side connecting rod with respect to the operation Two levers for moving the side connecting rods in opposite directions;
A gas circuit breaker having a buffer structure fixed to the guide so as to come into contact with the driven-side connecting rod at the end of the blocking operation. The gas circuit breaker according to claim 1,
A drive side movable pin is connected to each of the first groove cam of the drive side connecting rod, the second groove cam of the guide, and the third groove cam of the lever, and the lever fixing pin is sandwiched between them. A gas circuit breaker characterized in that a driven movable pin for moving the driven connecting rod is communicated with a position opposite to the driven movable pin.
The gas circuit breaker according to claim 1,
The material of the elastic body that the buffer structure has is a rubber material, a resin material, an aluminum material, an iron material, a stainless steel material, a copper material, a titanium material, a carbon-based composite material, or a glass-based composite material, Alternatively, a gas circuit breaker using a coil spring, an air damper, a hydraulic damper, or a damper using electrical control.
The gas circuit breaker according to claim 1,
A gas circuit breaker characterized in that the buffer structure has a sealed structure of an elastic body.
The gas circuit breaker according to claim 4,
A gas circuit breaker characterized in that the buffer structure has an elastic body sealed with a backing plate, an end plate, and a guide.
The gas circuit breaker according to claim 4,
A gas circuit breaker characterized in that the elastic body of the buffer structure is covered with a laminate of a light shielding film, a heat insulating material, and a corrosion-resistant body at the periphery and / or part thereof.
The gas circuit breaker according to claim 6,
The gas circuit breaker characterized in that the material of the corrosion-resistant body of the buffer structure is any of stainless steel, resin material, aluminum material, iron material, copper material, titanium material, carbon-based composite material, and glass-based composite material .
The gas circuit breaker according to claim 1,
The gas circuit breaker, wherein the buffer structure is fastened to the guide with a fixing bolt.
The gas circuit breaker according to claim 8,
2. The gas circuit breaker according to claim 1, wherein the buffer structure is fastened to the guide so that a contact surface of the driven side connecting rod comes into contact with the end of the blocking operation.
The gas circuit breaker according to claim 1,
The gas circuit breaker is characterized in that the buffer structure is a structure in which an elastic body is fastened by passing a backing plate and an end plate through bolts and nuts.
The gas circuit breaker according to claim 10,
In the buffer structure, the contact surface of the driven side connecting rod and the contact surface of the contact plate come into contact with the guide through a flange provided on the end plate with a fixing bolt at the end of the blocking operation of the driven side connecting rod. A gas circuit breaker characterized in that it is fastened.
The gas circuit breaker according to claim 1,
The fastening of the buffer structure and the guide is as follows:
Fastening by mounting at an angle where the axial direction of the fixing bolt matches or does not match the driving shaft direction,
Fastening with adhesive or welding to connect the buffer structure and the guide,
Fastening by fixing the buffer structure to the guide via a support member, or
A gas circuit breaker characterized in that the buffer structure is either fastening by fixing to one or more members other than the guide or a plurality of members including the guide.
The gas circuit breaker according to claim 1,
The drive side connecting rod is
Having a first groove cam including a second straight portion, a connecting portion, a first straight portion;
The gas circuit breaker characterized in that the first straight portion and the second straight portion are provided on different axes with respect to the driving direction, and a connecting portion is provided therebetween.
The gas circuit breaker according to claim 13,
The guide is
A second groove cam equal to the groove width of the first groove cam of the drive side connecting rod is cut,
The first groove cam of the drive side connecting rod and the second groove cam of the guide have a laminated structure, and a movable pin is arranged at an overlapping portion of both groove cams, and the gas is movably connected to each other. Circuit breaker.
The gas circuit breaker according to claim 1,
The lever is provided with a round hole, the driven side connecting rod is provided with a long hole, or the lever is provided with a long hole, and the driven side connecting rod is provided with a round hole,
A gas circuit breaker characterized in that the driven side movable pin passes through the hole of the lever and the hole of the driven side connecting rod.

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