JP2001110289A - Gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently cause pressure rise in a compression chamber after operation in a medium opening term, without uselessly releasing gas in the compression chamber during operation in an initial opening term, by using a blocking means for opening/closing an opening of a movable cylinder in addition to a communication hole of an operation rod. SOLUTION: A fixed contact portion 2 and a movable contact portion 3 are opposed to each other in a container 1 filled with arc-extinguishing gas. The fixed contact portion 2 contains a fixed arc contact 4 and a current contact 5 while the movable contact portion 3 contains a movable cylinder 6, a hollow operation rod 7, a movable arc contact 8, an insulating nozzle 9, a movable current contact 10 and a piston to form a compression chamber 13. The movable cylinder 6 and the operation rod 7 are provided with an opening 16 and a communication hole 17, respectively. The outer periphery of the operation rod 7 is provided with a rotary shutter 20 consisting of a cylindrical blocking cylinder 21 and an annular blocking plate 22, which is rotated in engagement with a piston 12 for opening/closing the communication hole 17 and the opening 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker, and more particularly, to a gas circuit breaker, which can be widely applied to cold regions and extinguishes an arc generated when a movable contact portion is separated from a fixed contact portion. The present invention relates to a gas circuit breaker that uses a small amount of arc-extinguishing gas while maintaining a high capacity.

[0002]

2. Description of the Related Art A gas circuit breaker interrupts a high current in order to protect a power transmission system and a power distribution system when a ground fault or a short circuit between lines occurs. Among these gas circuit breakers, puffer type gas circuit breakers with simple structure, high reliability, and excellent breaking ability are used in many substations,
For example, there is a configuration shown in FIGS. 21 to 23 (Japanese Patent Application No. 10-233338). Here, FIGS.
23 is a schematic cross-sectional view of the gas circuit breaker, FIG. 21 shows a closed state of the gas circuit breaker, FIG. 22 shows a middle state of opening of the gas circuit breaker, and FIG. 23 shows a late state of opening of the gas circuit breaker. Each is shown.

In this gas circuit breaker, a horizontally long cylindrical insulating container 1 is first filled with a mixed gas obtained by adding at least one other gas to SF ₆ gas. Here, other types of gases to be added to the SF ₆ gas include, for example, oxygen gas excellent in electric negative, carbon dioxide gas or hydrogen gas excellent in high diffusivity, a rare gas, specifically, helium gas, Argon gas or N ₂ gas having excellent insulation properties is used.

[0004] A fixed contact portion 2 and a movable contact portion 3 are arranged opposite to each other in a container 1 filled with such a mixed gas. Of these, the fixed contact part 2 is the container 1
The fixed arc contact 4 is fixed substantially at the center in the radial direction, and a cylindrical fixed energizing contact 5 surrounding the fixed arc contact 4 is provided.

[0005] The movable contact part 3 first has a movable cylinder 6 housed in the container 1, a hollow operating rod 7 fixed inside the movable cylinder 6, and a fixed tip at the tip of the operating rod 7. The finger-shaped movable arc contact 8, an insulating nozzle 9 fixed to the tip of a movable cylinder 6 so as to concentrically surround the movable arc contact 8, and the insulating nozzle 9 concentrically A movable energizing contact 10 fixed to the tip of the movable cylinder 6 so as to surround the movable cylinder 6 is provided. The movable contact part 3 further includes a piston 12 fixed to the container 1 via a piston support part 11, and the piston 12 and the movable cylinder 6
Relative movement by the action of.

In the movable contact portion 3, a space surrounded by the movable cylinder 6, the operating rod 7, and the piston 12 forms a compression chamber 13, and the movable cylinder 6 and the operating rod 7 are integrated. When these members 6 and 8 move toward the piston 12 which is the opening direction, these members 6, 8
The relative movement between the piston and the piston 12 compresses the mixed gas inside the compression chamber 13.

Further, the mixed gas compressed in the compression chamber 13 is jetted toward the throttle passage 14 inside the nozzle 9 at the tip of the movable cylinder 6 to extinguish the arc 15 generated during the opening. An opening 16 is formed.
The operating rod 7 has a through hole 17 communicating between the inside and the outside of the compression chamber 13, and the outer peripheral surface of the through hole 17 is closed in a closed state, and is closed in an open state. An annular closing plate 18 for opening the opening 17 is provided.

Here, the closing plate 18 is connected to the piston 12 via an elastic body 19 and is urged to a position where the opening 17 is closed by the force of the elastic body 19. In this case, the urging force of the closing plate 18 by the elastic body 19 is smaller than the frictional force between the closing plate 18 and the operation rod 7. Accordingly, when the operating rod 7 moves in the opening direction, the closing plate 18 follows the movement by the frictional force between the operating rod 7 and the elastic body 19 until the elastic body 19 becomes the most compressed state. The follow-up operation keeps the opening 17 closed.

In the gas circuit breakers of FIGS. 21 to 23 having the above-described configuration, when a closing command is input, as shown in FIG. 21, the operating rod 7 is driven by the driving force of a driving unit (not shown).
And the fixed contact portion 2 in which the movable cylinder 6 is closed.
To move the movable contact 10 to the fixed contact 5
And the movable arc contact 8 is brought into contact with the fixed arc contact 4 so that a high current is applied. In this closed state, the closing plate 18 provided on the outer peripheral surface of the operating rod 7 is held at a position where the opening 17 is closed by the force of the elastic body 19.

Further, when the gas circuit breaker is in the closed state shown in FIG. 21 and an accident occurs in the power system and an opening command is input, the gas circuit breaker is operated by the driving force of the drive unit. The rod 7 and the movable cylinder 6 are moved toward the piston 12 which is the opening direction, and the movable arc contact 8 and the movable energizing contact 10 are separated from the fixed arc contact 4 and the stationary energizing contact 5, respectively.

During the opening operation, the closing plate 18 is closed.
Follows the movement of the operating rod 7 due to the frictional force with the operating rod 7 and moves toward the piston 12 with the opening 17 of the operating rod 7 closed. During this time, the mixed gas sealed in the compression chamber 13 in the movable cylinder 6
While the pressure is gradually increased by the pressing force of 2, the movable cylinder 6
Arc 1 generated during opening through opening 16 provided in
5, the pressure is further increased by utilizing the heating power of the arc 15.

Fixed arc contact 4 of movable arc contact 8
When the gas breaker advances to the middle stage of opening operation, the gas circuit breaker moves the closing plate 18 to the fixed arc contact 4 side by the elastic force of the elastic body 19 as shown in FIG. 7 is opened. At this point, the compression chamber 1
The mixed gas in 3 is formed by the pressing force of the piston 12 and the arc 15.
Since the pressure is sufficiently increased by the heating power of
Flows toward the throttle flow path 14 of the nozzle 9 through the opening 17 of the
The arc extinguishing of 5 is started.

[0013] When the separation is further advanced and the opening operation is started, the gas circuit breaker, as shown in FIG. Arc 1 with a reduced heat flux flowing towards 14
5, the arc 15 is surely extinguished to end the arc extinguishing operation.

FIG. 24 shows a conventional gas circuit breaker in which the pressure distribution of the mixed gas in the case where the closing plate 18 is not provided is compared with the pressure distribution of the mixed gas in the case where the closing plate 18 is provided. FIG. Here, the case where the closing plate 18 is not provided corresponds to the case where the closing plate 18 does not follow the operation of the operation rod 7 and the opening 17 is opened from the initial stage of opening.

As is clear from FIG. 24, the closing plate 1
Although the gas circuit breaker without 8 can rapidly increase the pressure of the mixed gas in the initial operation of opening the electrode, the pressure drops significantly after the middle operation of opening the electrode. On the other hand, in the case of the gas circuit breaker provided with the closing plate 18, the compression chamber 13 in the movable cylinder 6 is set to a substantially sealed state in the initial operation of opening the electrodes, and the outflow of the nozzle 9 to the throttle channel 14 is delayed to mix. Since the pressure of the gas can be increased, the pressure of the mixed gas in the compression chamber 13 can be maintained at a high value even at the zero point of the cutoff target current. The data shown in the pressure distribution diagram was confirmed by a model test.

[0016]

However, the conventional gas circuit breaker constructed as described above has the following problems. (1) Since the mixed gas in the compression chamber 13 is compressed even at the time of the initial opening operation from the start of the operation to the opening of the electrode, the mixed gas is ejected from the opening 16 at this time and used for arc extinguishing. The amount of the mixed gas is reduced, and the arc extinguishing performance is reduced. Further, only by closing the passage 17 during the initial operation of opening the electrode and delaying the outflow of the nozzle 9 into the throttle channel 14, there is a limit to the pressure rise of the mixed gas in the compression chamber 13, and it is difficult to improve the shutoff performance. It is. (2) In the opening initial operation, the closing plate 18 moves following the operating rod 7 due to the frictional force between the operating rod 7 and the closing force, but the frictional force changes due to a manufacturing error, an assembly error, and the number of operations and time. Therefore, it is difficult to realize a stable following operation as designed. (3) Since the elastic body 19 for holding the closing plate 18 provided on the outer peripheral surface of the operating rod 7 at the closing position is installed in the compression chamber 13, the mixing temperature which becomes high during the opening operation is increased. Exposure to gas, decomposition gas adheres, and elastic body 1
9 itself may be reduced in strength and may be damaged.
That is, in the conventional configuration using the closing plate 18 to close the opening 17 in the closed state, the elastic body 19 installed in the compression chamber 13 becomes a weak point, and the mechanical reliability of the gas circuit breaker is reduced. Lower it.

The present invention has been proposed to solve the above-mentioned problems of the conventional gas circuit breaker, and an object of the present invention is to provide an opening of a movable cylinder in addition to an opening of an operating rod. By using a closing means that can also be opened and closed, the gas in the compression chamber is not wastefully released during the initial operation of opening, and the compression chamber can be efficiently pressurized after the middle operation of opening, so that arc extinguishing performance, An object of the present invention is to provide a gas circuit breaker which is excellent in operation reliability and mechanical reliability, and is excellent in breaking performance.

[0018]

In order to solve the above problems, a gas circuit breaker according to the present invention is provided with a rotary shutter that rotates on the outer periphery of an operation rod by utilizing relative movement of a movable contact portion. With this rotary shutter, the opening of the movable cylinder can be opened and closed in addition to the opening of the operation rod.

Here, the gas circuit breaker according to the present invention has the following basic configuration. That is, the fixed contact portion and the movable contact portion are arranged to face each other in the container filled with the arc-extinguishing gas. Among these, the movable contact portion includes at least a movable cylinder, a hollow operation rod fixed inside the movable cylinder, an insulating nozzle for gas blowing fixed to a tip of the movable cylinder, and a container. And a piston fixed to the piston. The movable contact portion is configured to compress the arc-extinguishing gas in the compression chamber formed by the movable cylinder, the operation rod, and the piston by relatively moving the piston and the movable cylinder. And, in the operation rod, a through-hole portion communicating with the inside and outside of the compression chamber is formed, and at the tip of the movable cylinder,
An opening for ejecting the arc-extinguishing gas compressed in the compression chamber into the nozzle is formed. Further, a closing means for closing the opening at the time of the initial operation of opening the electrode is provided.

The gas circuit breaker according to the first aspect has the following features in the gas circuit breaker having the above basic configuration. First, the closing means is a rotary shutter provided with a cylindrical closing cylinder arranged on the outer periphery of the operating rod to close the opening, and an annular closing plate fixed to the closing cylinder and closing the opening. is there. And
The closing cylinder communicates with a guide groove for rotating the rotary shutter between an open position and a closed position by using a relative movement between the rotary shutter and the piston, and with the opening when the rotary shutter is at the open position. A vent is provided. Further, the closing plate is provided with an opening vent which communicates with the opening when the rotary shutter is in the open position. On the other hand, the piston is provided with a guide projection that engages with the guide groove.

In this gas circuit breaker, by appropriately selecting the size and shape of the guide groove, the stop and rotation of the rotary shutter can be appropriately controlled in accordance with the operating position of the movable contact portion. Therefore, during the initial operation of opening the electrode, by holding the rotary shutter at the closed position without rotating it, it is possible to close not only the opening of the operation rod but also the opening of the movable cylinder. Gas is not wasted.

Further, as the opening progresses, the rotary shutter is directly rotated by the piston by utilizing the relative movement between the rotary shutter and the piston, so that the rotary shutter is moved to the open position, and the opening and the opening are opened. Both parts can be opened. In this case, by adjusting the dimensional shape and arrangement of the opening part ventilation opening and the opening part ventilation opening of the rotary shutter, it is possible to appropriately change the opening timing and opening degree of the opening part and the opening part due to the rotation of the rotating shutter. Since it can be adjusted, the heat energy of the arc can be efficiently taken in through the opening and the opening, and the pressure in the compression chamber can be efficiently increased.

As described above, in this gas circuit breaker, the gas in the compression chamber is not unnecessarily discharged during the initial operation of opening the electrode, and after the middle operation of opening of the electrode, the gas circuit breaker is opened and closed through the opening and the opening. The heat energy of the arc can be efficiently taken in, and the pressure in the compression chamber can be efficiently increased. Therefore,
A sufficiently high pressure gas can be blown to the arc.

In addition, since a stable operation of the rotary shutter can be ensured by the guide structure in which the rotary shutter and the piston are securely engaged, the operation reliability is excellent. Further, since the rotary shutter is directly rotated by the piston using the relative movement between the rotary shutter and the piston, there is no need to install an elastic body in the compression chamber, so that the mechanical reliability of the gas circuit breaker is reduced. Can be improved.

The gas circuit breaker according to the second aspect is the first aspect of the invention.
Wherein the configuration of the guide groove of the rotary shutter is limited. That is, the guide groove is formed in parallel with the axis of the closing cylinder and blocks the rotation of the rotary shutter, and is formed so as to draw a substantially spiral shape in the axial direction of the closing cylinder to rotate the rotary shutter. It is configured by combining with a spiral portion.

In this configuration, at the time of relative movement between the rotary shutter and the piston, the guide protrusion on the piston side simply slides in the linear portion of the guide groove, while the spiral portion of the guide groove slides in the linear portion of the guide groove. The guide protrusion on the piston side presses the rotary shutter in the rotation direction via the spiral portion. Therefore, by appropriately forming the linear portion and the spiral portion of the guide groove according to the operating position of the movable contact portion, during the initial operation of opening, the rotary shutter is held at the closed position without rotating, Thereafter, as the opening proceeds, the rotary shutter can be rotated to move to the open position.

The gas circuit breaker according to the third aspect is the first aspect.
Alternatively, in the gas circuit breaker described in 2 above, the configuration of the opening portion ventilation opening and the opening portion ventilation opening is limited.
That is, during opening operation, the opening ventilation opening starts opening the opening due to the rotation of the rotary shutter during the opening operation, and the rotation shutter further rotates. The vent is configured to initiate opening of the vent.

In this configuration, first, by gradually opening the opening, the arc-heated gas is introduced into the compression chamber through the opening, and the gas in the compression chamber is further pressurized. Gas can be delayed. Then, by gradually opening the opening by the rotation of the rotating shutter, the gas heated by the arc is guided into the compression chamber through the opening, and the gas in the compression chamber can be further pressurized.

As described above, the timing of opening the opening and the opening due to the rotation of the rotary shutter and the change in the opening degree can be appropriately adjusted, so that the heat energy of the arc through the opening and the opening can be adjusted. And the pressure in the compression chamber can be efficiently increased. Therefore, the gas pressure in the compression chamber can be maintained at a higher pressure in the period from the opening operation in the middle stage to the shutoff target current zero point, leading to an improvement in the shutoff performance.

The gas circuit breaker according to the fourth aspect is the first aspect.
The gas circuit breaker according to any one of the above-described items 3, wherein the rotary shutter is constituted by a plurality of rotary shutters arranged inside and outside so as to be substantially coaxial.

In this configuration, by arranging a plurality of rotary shutters, the opening area of the opening of the movable cylinder can be increased, so that the amount of gas ejected from the compression chamber can be increased. Therefore, a sufficient amount of gas can be blown to the arc,
Arc extinguishing performance can be improved.

The gas circuit breaker according to the fifth aspect is the first aspect of the invention.
The gas circuit breaker according to any one of the above-described aspects, wherein the guide groove is formed as a groove with a bottom on the surface of the closing cylinder instead of a notched groove penetrating the closing cylinder.

In this configuration, the force acting on the terminal end of the guide groove can be suppressed to a low level by forming the guide groove with the bottomed groove. This can prevent a decrease in target strength.

[0034] The gas circuit breaker according to the sixth aspect is the first aspect.
In the gas circuit breaker according to any one of the above-described items 5, a plurality of sets each including a guide groove and a guide protrusion are provided.

In this configuration, by providing a plurality of sets of guide grooves and guide projections, the force acting on the end of each guide groove can be dispersed, so that a large force acts on the end of the guide groove. This can prevent the mechanical strength from being reduced.

The gas circuit breaker according to the seventh aspect is the first aspect of the present invention.
In the gas circuit breaker according to any one of the above-described embodiments, the configuration of the opening vent is limited. That is, the opening vent, the effective width dimension of the opening vent that determines the opening width dimension of the opening when overlapping with the opening,
It is formed so as to increase in either a stepwise increase or a gradual increase in the rotation direction of the rotary shutter during the opening operation.

In this configuration, the effective width of the opening is gradually increased or gradually increased in the rotation direction during the opening operation, so that the opening of the opening during the intermediate operation of opening operation is increased. Suppress the increase in area,
The amount of gas ejected from the opening can be suppressed. Therefore, the gas pressure in the compression chamber can be maintained at a higher pressure in the period from the opening operation in the middle stage to the shutoff target current zero point, leading to an improvement in the shutoff performance.

[0038] The gas circuit breaker according to the eighth aspect is the first aspect.
In the gas circuit breaker according to any one of the above-mentioned items 7, the structure of the ventilation port is limited. That is, the opening portion vent, the effective width dimension of the opening portion vent that determines the opening width dimension of the opening portion when overlapping with the opening portion,
It is formed so as to increase in either a stepwise increase or a gradual increase in the rotation direction of the rotary shutter during the opening operation.

In this configuration, the opening dimension of the portion of the opening portion that overlaps the opening portion is gradually increased or gradually increased in the rotation direction at the time of opening operation, thereby increasing the opening period. An increase in the opening area of the opening during operation can be suppressed, and an increase in the amount of inflow gas flowing into the compression chamber from the opening can be suppressed. An increase in the amount of gas flowing in from the opening causes an increase in the amount of gas ejected from the opening. As a result, the gas pressure in the compression chamber can be maintained at a higher pressure, which leads to an improvement in shutoff performance.

The gas circuit breaker according to the ninth aspect is the first aspect of the invention.
9. The gas circuit breaker according to any one of claims 1 to 8, wherein the closing plate is formed so as to separate the plurality of closing portions arranged at substantially equal intervals in the annular direction from the adjacent closing portions, and the opening portion is ventilated. It is characterized by being constituted by a plurality of notches forming the mouth.

In this configuration, since the opening vent is formed by the cutout, the processing of the closing plate is easier as compared with the case where the vent is formed by the vent, thereby improving the productivity of the gas circuit breaker. it can.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gas circuit breaker according to the present invention will be specifically described below with reference to FIGS.

First Embodiment FIGS. 1 to 3 are schematic cross-sectional views showing a first embodiment of a gas circuit breaker according to the present invention. FIG. 1 is a closed state of the gas circuit breaker, FIG. FIG. 3 shows a middle state of opening of the gas circuit breaker, and FIG. 3 shows a state of late opening of the gas circuit breaker. FIGS. 4 to 6 are partial configuration diagrams showing the periphery of the rotary shutter in the gas circuit breaker shown in FIGS. 1 to 3. In FIGS. FIG. 4B is a side view of a rotary shutter portion, and FIG. 4 shows a closed state of the gas circuit breaker, FIG. 5 shows a middle stage of opening of the gas circuit breaker, and FIG. 6 shows a late state of opening of the gas circuit breaker.

[Structure] As shown in FIG. 1, in the gas circuit breaker of the present embodiment, a horizontally long tubular insulating container 1 has
A mixed gas similar to that of the related art is filled, and a fixed contact portion 2 and a movable contact portion 3 are arranged in the container 1 so as to face each other. Among them, the configuration of the fixed contact portion 2 is the same as that of the prior art, and the fixed arc contact 4 fixed to the substantially center in the radial direction of the container 1 and the cylinder surrounding the fixed arc contact 4. It has a fixed current-carrying contact 5 in a shape.

The structure of the movable contact part 3 is the same as that of the prior art except for a part. That is, the movable contact portion 3
First, a movable cylinder 6 housed in the container 1 and a hollow operating rod 7 fixed inside the movable cylinder 6
A finger-shaped movable arc contact 8 fixed to the tip of the operating rod 7; and an insulating nozzle 9 fixed to the tip of the movable cylinder 6 so as to concentrically surround the movable arc contact 8. And a movable energizing contact 10 fixed to the tip of the movable cylinder 6 so as to concentrically surround the insulating nozzle 9.

The movable contact portion 3 further includes a piston 12 fixed to the container 1 via a piston support 11, and the piston 12 and the movable cylinder 6 move relatively by the operation of the movable cylinder 6. It has become.

In the movable contact portion 3, a space surrounded by the movable cylinder 6, the operating rod 7, and the piston 12 forms a compression chamber 13, and the movable cylinder 6 and the operating rod 7 are integrated. When these members 6 and 8 move toward the piston 12 which is the opening direction, these members 6, 8
The relative movement between the piston and the piston 12 compresses the mixed gas inside the compression chamber 13.

Further, at the tip of the movable cylinder 6, the mixed gas compressed in the compression chamber 13 is jetted toward the throttle flow path 14 inside the nozzle 9 to extinguish the arc 15 generated during opening. An opening 16 is formed.
The operating rod 7 has a through hole 17 communicating the inside and outside of the compression chamber 13.

The above structure of the movable contact portion 3 is the same as that of the prior art. However, in the present embodiment, the opening portion 17 and the opening are replaced with the conventionally provided opening / closing plate 18 for opening and closing. Part 1
6 is provided with a rotary shutter 20 for opening and closing both. The rotary shutter 20 is disposed on the outer periphery of the operation rod 7 and closes the opening 17 thereof.
The opening 1 of the movable cylinder 6 is fixed to the closing cylinder 21.
6 comprises an annular closing plate 22 for closing
In the closed state, it is in the closed position and closes the opening 17 and the opening 16 respectively. During the opening operation, it rotates to reach the open position and opens the opening 17 and the opening 16 respectively. I have.

More specifically, of the rotary shutter 20,
The closing cylinder 21 is provided with a through-hole vent (through-hole vent) 23 communicating with the through-hole 17 of the operation rod 7, and the closing plate 22 communicates with the opening 16 of the movable cylinder 6. An opening vent (opening vent) 24 is provided. In addition, a rotary shutter 20 and a piston 12
A guide groove 25 for rotating the rotary shutter 20 between the open position and the closed position using relative movement of the piston 12 is provided as a notch groove penetrating the closing cylinder 21.
Is engaged with the guide projection 26 fitted to the guide projection 26. By the combination of the guide groove 25 and the guide protrusion 26, the stop and rotation of the rotary shutter 20 are controlled according to the relative movement between the rotary shutter 20 and the piston 12.

Further, as shown in FIGS. 4 to 6A, the guide groove 25 is formed in parallel with the axis of the closing cylinder 21 to prevent the rotation of the rotary shutter 20 from rotating. And a helical portion that is formed so as to draw a substantially helical shape in the axial direction and rotates the rotary shutter. In addition, by appropriately forming the linear portion and the spiral portion of the guide groove 25 in accordance with the operation position of the movable contact portion 3, the closing position can be set without rotating the rotary shutter 20 during the initial opening operation. After that, as the opening proceeds, the rotary shutter 20 is rotated to move to the open position.

[Operation] The operation of the gas circuit breaker according to this embodiment having the above configuration is as follows.

First, when the gas circuit breaker according to the present embodiment is in the closed state shown in FIG. 1 and an accident occurs in the electric power system and an opening command is input, the gas circuit breaker is driven by a driving unit. The operating rod 7 and the movable cylinder 6 are moved toward the piston 12 which is the opening direction by the driving force (not shown), and the movable arc contact 8 and the movable energizing contact 10 are respectively fixed to the fixed arc contact 4 and fixed. It is separated from the current-carrying contact 5.

At this time, the rotary shutter 20 moves to the piston 12 side together with the operating rod 7, and the guide groove 25 of the rotary shutter 20 and the guide projection 2 of the piston 12 move.
6 is engaged, the guide protrusion 26 is moved into the guide groove 25 by the relative movement between the piston 12 and the movable cylinder 6.
The rotary shutter 20 starts rotating around the axis of the operating rod 7 at the time when the inside of the guide groove 25 moves from the straight portion to the spiral portion.

That is, as shown in FIG. 4A, the guide projection 26 of the piston 12 is kept open during the initial opening operation immediately before the fixed arc contact 4 and the movable arc contact 8 are separated. , The rotary shutter 20 does not rotate because it is located in a linear portion of the guide groove 25 that is parallel to the axis of the closing cylinder 21.
It is held in the closed position. However, as shown in FIG. 5 (A), in the middle of opening operation after the fixed arc contact 4 and the movable arc contact 8 are separated from each other, the guide projection 26 of the piston 12 closes in the guide groove 25. The rotation of the rotary shutter 20 starts to rotate because the guide projection 26 presses the rotary shutter 20 in the rotation direction via the guide groove 25 by shifting to a spiral portion that draws a substantially spiral shape with respect to the axis of the cylinder 21.

On the other hand, as shown in FIGS. 4A and 4B, the opening 17 and the opening 16 are respectively closed by the closing cylinder 21 and the closing plate 22 during the initial operation of opening until the opening is performed. , And the mixed gas in the compression chamber 13 gradually increases in pressure by the pressing force of the piston 12 without leaking to the outside. Then, as shown in FIGS. 5A and 5B, in the middle opening operation immediately after the opening, when the rotary shutter 20 starts rotating, the opening 16 and a part of the opening ventilation hole 24 overlap. Since a part of the opening 16 is opened, the high-pressure mixed gas heated by the arc 15 flows through the opening 16 and the opening ventilation hole 24 into the compression chamber 13 according to the opening degree of the opening 16. And the mixed gas in the compression chamber 13 is pressurized. At this point, as shown in FIG. 5A, the opening 17 and the opening 23 are not yet overlapped.

However, when the movable arc contact 8 further separates from the fixed arc contact 4 and the rotary shutter 20 further rotates from the state shown in FIG.
7 and a part of the through hole 23 overlap, and the through hole 17
Is opened, the mixed gas heated by the arc 15 flows into the compression chamber 13 through the opening 17 and the opening 25 according to the opening degree of the opening 17. Come. At this time, the mixed gas in the compression chamber 13 is jetted out to the throttle channel 14 of the nozzle 9 and the pressure is reduced, but the pressure is increased again by the mixed gas flowing in from the opening 17.

When the separation is further advanced and the operation in the latter half of the opening operation is started, the gas circuit breaker, as shown in FIG. 1
Arc 15 with a reduced heat flux flowing towards 4
And the arc 15 is surely extinguished to end the arc extinguishing operation. At this time, the rotary shutter 20 is in the state shown in FIGS. 6A and 6B, and the opening 16 and the passage 17 are fully open.

Further, in the gas circuit breaker according to the present embodiment, when the closing command is input, as shown in FIG. 1, the operating rod 7 and the movable cylinder 6 are moved in the closing direction by the driving force from the driving unit. By moving the movable contact 10 to the fixed contact 5, the movable arc contact 8 is contacted to the fixed arc 4, and a high current is applied. In this closing operation, the rotary shutter 20 provided around the operation rod 7 moves from the open position to the closed position while rotating in the reverse direction to the direction described in the opening operation, and the opening 16 and the opening are opened. The part 17 is closed.

The opening operation and closing operation of the gas circuit breaker according to the present embodiment are as described above. However, in the gas circuit breaker according to the present embodiment, the gas pressure distribution during the opening operation is smaller than that of the conventional gas circuit breaker. Can be greatly improved. Hereinafter, the improvement of the gas pressure distribution will be described with reference to FIG.

FIG. 7 is a diagram showing a conventional technique shown in FIG.
Pressure distribution lines showing the pressure distribution of the gas mixture of the gas circuit breakers (hereinafter referred to as conventional gas circuit breakers) shown in FIGS. FIG. It is apparent from FIG. 7 that the gas pressure distribution of the gas circuit breaker according to the present embodiment is significantly improved as compared with the conventional gas circuit breaker. The reason why the gas pressure distribution can be improved in this embodiment is as follows.

First, when the conventional gas circuit breaker does not have the closing plate 18 or does not follow the operation of the operating rod 7 even if the closing plate 18 is present, the mixed gas rapidly increases in pressure in the initial operation of opening the electrode. However, the pressure drops remarkably after the mid-opening operation. On the other hand, when the closing plate 18 follows the operation of the operating rod 7 in the conventional gas circuit breaker, the compression chamber 13 in the movable cylinder 6 is set to a substantially sealed state, and the outflow of the nozzle 9 to the throttle passage 14 is prevented. Since the pressure of the mixed gas can be increased with a delay, the pressure of the mixed gas in the compression chamber 13 can be maintained at a high level even at the zero point of the cutoff target current. This point
The gas pressure distribution of the conventional gas circuit breaker is as described above.

In contrast to these conventional gas circuit breakers, in the gas circuit breaker of the present embodiment, the rotation of the rotary shutter 20 causes
Since the pressure of the mixed gas in the compression chamber 13 can be more efficiently increased, the compression chamber 13 at the cutoff target current zero point can be obtained.
The pressure of the mixed gas inside can be kept higher. That is, in the gas circuit breaker of the present embodiment, first, during the opening initial operation from the start of operation to the opening, the compression chamber 13 is completely closed by the rotary shutter 20, and the compression chamber 1 is closed.
The pressure can be increased by the pressing force of the piston 12 without leaking the mixed gas in 3.

The gas circuit breaker of this embodiment is heated by the arc 15 by gradually opening the opening 16 by the rotation of the rotary shutter 20 while the pressure is increased by the pressing force of the piston 12 in the subsequent middle period of opening operation. The mixed gas thus introduced is introduced into the compression chamber 13 through the opening 16, and the pressure of the mixed gas in the compression chamber 13 is further increased to delay the outflow of the mixed gas into the throttle channel 14 of the nozzle 9. The opening 17 is gradually opened by the subsequent rotation of the rotary shutter 20, whereby the mixed gas heated by the arc 15 is led into the compression chamber 13 through the opening 17, and the mixed gas in the compression chamber 13 is opened. The pressure can be further increased.

As described above, in the gas circuit breaker of the present embodiment, the opening 16 and the opening are controlled by adjusting the dimensions and arrangement of the opening 23 and the opening 24 of the rotary shutter 20. Since the opening timing of the opening 17 and the change of the opening degree can be appropriately adjusted, the opening 16 and the opening 1 can be adjusted.
The heat energy of the arc 15 can be efficiently taken in through the metal 7. As a result, the pressure in the compression chamber 13 can be efficiently increased, so that the gas pressure in the compression chamber 13 can be maintained at a higher pressure during the period from the opening middle stage operation to the cutoff target current zero point, In particular, in the gas circuit breaker of the present embodiment, the balance between the frictional force and the elastic force of the elastic body 19 as in the conventional gas circuit breaker is achieved by the guide structure in which the piston 12 and the rotary shutter 20 are securely engaged. The stable operation of the rotary shutter 20 can be ensured as compared with the unstable operation of the closing plate 18, so that the gas pressure distribution as described above can be reliably realized.

[Effects] Therefore, according to the present embodiment, the gas in the compression chamber 13 is not unnecessarily released during the initial operation of opening, and after the middle operation of opening, the opening 16 and the opening portion are opened. Since the heat energy of the arc 15 can be efficiently taken in via the pressure chamber 17 and the pressure in the compression chamber 13 can be efficiently increased, a sufficient amount of gas at a sufficiently high pressure can be blown to the arc. Arc performance can be improved.

In particular, the thermal energy of the arc 15 is efficiently taken in through the opening 16 and the opening 17 by utilizing the opening timing of the opening 16 and the opening 17 and the change of the opening degree. Since the pressure in the compression chamber 13 can be increased efficiently, the gas pressure in the compression chamber 13 can be maintained at a higher pressure from the middle stage of the opening operation to the zero point of the cutoff target current. Connect.

The guide structure in which the piston 12 and the rotary shutter 20 are securely engaged with each other allows the rotary shutter 2 to rotate.
Since a stable operation of zero can be ensured, the operation reliability is superior to that of the conventional example using the balance between the frictional force and the elastic force. Further, since the rotary shutter 20 is directly rotated by the piston 12 using the relative movement between the piston 12 and the movable cylinder 6, there is no need to install an elastic body in the compression chamber 12 as in the conventional example. Therefore, the mechanical reliability of the gas circuit breaker can be improved.

[Second Embodiment] FIG. 8 is a schematic cross-sectional view showing a gas circuit breaker according to a second embodiment of the present invention, particularly showing a closed state. 9 and FIG.
FIG. 9 is a partial configuration diagram illustrating a portion around a rotary shutter in the gas circuit breaker illustrated in FIG. 8, in particular, (A) is a side view of a rotary shutter portion, and (B) is a front view of a closing plate. FIG.
Shows a closed state of the gas circuit breaker, and FIG. 10 shows a late state of opening of the gas circuit breaker. In addition, these FIG.
In FIG. 10 to FIG. 10, the same reference numerals are given to the same or corresponding portions as the components of the first embodiment described above.

[Structure] As shown in FIG. 8, the gas circuit breaker according to the present embodiment has a rotary shutter composed of a plurality of rotary shutters arranged inside and outside so as to be substantially coaxial. In FIG. 8, two rotary shutters 2
An example in which 0a and 20b are arranged is shown. As shown in FIG. 8, a first rotary shutter 20a is arranged so as to directly contact the outer periphery of the operating rod 7, and a second rotary shutter 20b is arranged outside the first rotary shutter 20a.

The first rotary shutter 20a includes a first closing cylinder 21a and a first closing plate 22a. The first closing cylinder 21a has a first through hole 23a. One closing plate 22a has a first opening vent hole 24a.
Is provided. Similarly, the second rotary shutter 20b
Is composed of a second closing cylinder 21b and a second closing plate 22b, and the second closing cylinder 21b has a second through hole vent 23b.
Is provided in the second closing plate 22b.
4b is provided.

As shown in FIGS. 9 and 10A, a first guide groove 25a and a second guide groove 25b are arranged in the first closing cylinder 21a and the second closing cylinder 21b, respectively. It engages with a guide projection 26 fitted to the piston 12. Furthermore, these guide grooves 25
In a and 25b, the dimensions of the straight portion and the spiral portion in the cylinder axis direction are substantially equal, but the angle of the spiral portion with respect to the cylinder axis is different.
Thus, the rotation angle of the first rotary shutter 20a is configured to be about twice the rotation angle of the second rotary shutter 20b.

[Operation] The operation of the gas circuit breaker according to the present embodiment having the above-described configuration is as follows.

First, in the closed state, the opening 16 is
As shown in FIG. 9B, since it does not overlap with the first opening portion ventilation hole 24a, it is closed by the first closing plate 22a, and overlaps with the second opening portion ventilation hole 24b in about half the area. ing. In FIG. 9B, the opening 16 is indicated by a dashed line, the first opening ventilation hole 24a is indicated by a broken line,
The second opening ventilation holes 24b are indicated by solid lines, respectively. In this closed state, as shown in FIG. 9 (A), the passage section 17 includes the first closing cylinder 21a and the second closing cylinder 2a.
1b.

In the gas circuit breaker according to the present embodiment, when an opening command is input from the above closed state and the electrode is opened,
The movement of the movable cylinder 6 and the operating rod 7 causes the guide projection 26 to move through the first guide groove 25a and the second guide groove 25b to the first rotary shutter 20a and the second rotary shutter 20.
b in the direction of rotation, the first rotary shutter 20a
And the second rotary shutter 20b rotates in the same direction.

As a result, the opening 16 is formed as shown in FIG.
As shown in (1), both the first opening ventilation hole 24a and the second opening ventilation hole 24b are substantially overlapped with each other. Also, as shown in FIG. 10A, the through-hole 17 is in a state where it overlaps with almost both the first through-hole vent 23a and the second through-port vent 23b.
In this state, the mixed gas in the compression chamber 13 flows out through the opening 17 to the throttle channel 14 side of the nozzle 9.

[Effects] Therefore, according to the present embodiment, in addition to obtaining the same effects as in the first embodiment, furthermore, by disposing a plurality of rotary shutters 20a, 20b, the opening 16 It is possible to increase the opening area. This is the same as (C-2) in FIG. 1 and FIG.
(B). And since the opening area of the opening 16 can be made large in this way, the compression chamber 13
The amount of the mixed gas flowing out of the fuel cell can be increased. As a result, a sufficient amount of the mixed gas can be blown to the arc 15, so that the arc extinguishing performance can be improved.

[Third Embodiment] FIG. 11 is a schematic cross-sectional view showing a third embodiment of the gas circuit breaker according to the present invention.
In particular, it shows a closed state. In FIG. 11, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals.

As shown in FIG. 11, in the gas circuit breaker according to the present embodiment, the guide groove 25 arranged in the closing cylinder 21 of the rotary shutter 20 is not a notched groove penetrating the closing cylinder 21 but a closed groove. It is a bottomed groove in which the surface of the cylinder 21 is slightly cut off.

The operation of the gas circuit breaker according to the present embodiment having such a configuration is as follows. That is, according to the present invention, the rotary shutter 20 having the guide groove 25 is provided, and the guide protrusion 26 engaging with the guide groove 25 is provided on the piston 12. Groove 25 and guide protrusion 26
Are engaged to rotate the rotary shutter 20, so that a contact force from the guide projection 26 acts on the side wall of the guide groove 25.

Therefore, when the guide groove 25 is a notch groove as in the first embodiment described above, a large force acts on the terminal end 27 of the guide groove 25, and the mechanical strength is reduced. On the other hand, in the gas circuit breaker according to the present embodiment, since the guide groove 25 is a bottomed groove, the guide groove 2
A large force does not act on the end portion 27 of No. 5, and the mechanical strength does not decrease.

Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained.
By using the guide groove 25 as a bottomed groove, a decrease in mechanical strength of the rotary shutter 20 can be prevented.

[Fourth Embodiment] FIG. 12 is a schematic cross sectional view showing a fourth embodiment of the gas circuit breaker according to the present invention.
In particular, it shows a closed state. In FIG. 12, the same or corresponding parts as those in the first embodiment described above are denoted by the same reference numerals.

As shown in FIG. 12, in the gas circuit breaker according to the present embodiment, a set of a guide groove 25 of the closing cylinder 21 of the rotary shutter 20 and a guide projection 26 which engages with the guide groove 25 is connected to the closing cylinder 21. Are provided at substantially equal intervals in the circumferential direction. FIG. 12 shows an example in which two sets of guide grooves 25 and guide projections 26 are provided.

The operation of the gas circuit breaker according to the present embodiment having such a configuration is as follows. That is, according to the present invention, the rotary shutter 20 having the guide groove 25 is provided, and the guide protrusion 26 engaging with the guide groove 25 is provided on the piston 12. Groove 25 and guide protrusion 26
Are engaged to rotate the rotary shutter 20, so that a contact force from the guide projection 26 acts on the side wall of the guide groove 25.

Therefore, when only one set of the guide groove 25 and the guide protrusion 26 is provided as in the first embodiment described above, a large force acts intensively on the end portion 27 of the guide groove 25. Lowers the mechanical strength. On the other hand, in the gas circuit breaker according to the present embodiment, since the plurality of sets of the guide groove 25 and the guide protrusion 26 are provided, the force acting on the terminal end 27 of each guide groove 2 is dispersed. , The mechanical strength does not decrease.

Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained.
By providing a plurality of sets of the guide grooves 25 and the guide projections 26, it is possible to prevent the mechanical strength of the rotary shutter 20 from decreasing.

[Fifth Embodiment] FIG. 13 is a partial structural view showing the vicinity of a closing plate of a gas circuit breaker according to a fifth embodiment of the present invention, and in particular, is a front view of the closing plate in a closed state. . In FIG. 13, the same reference numerals are given to the same or corresponding portions as the components of the first embodiment described above.

As shown in FIG. 13, in the gas circuit breaker according to the present embodiment, the width dimension (dimension in the radial direction of the rotary shutter 20) of the opening ventilation hole 24 is changed in the rotation direction of the rotary shutter 20. is there. That is, the opening ventilation hole 2
4 has the width of the opening 1 when it overlaps with the opening 16.
6, the present embodiment is such that the width of the opening portion 24 is gradually increased in the rotation direction of the rotary shutter 20 during the opening operation. is there. In FIG. 13, as a basic example of such a stepwise increase, an example in which the width dimension of the opening portion ventilation hole 24 is set in two stages to form the substantially T-shaped opening portion ventilation hole 24. Is shown.

The opening operation and closing operation of the gas circuit breaker according to this embodiment having such a configuration are exactly the same as those of the gas circuit breaker described in the first embodiment.
In the gas circuit breaker according to the present embodiment, the gas pressure distribution during the opening operation can be further improved. Hereinafter, the improvement of the gas pressure distribution will be described with reference to FIG.

FIG. 14 is a pressure distribution diagram showing a comparison between the pressure distribution of the mixed gas of the gas circuit breaker according to the first embodiment and the pressure distribution of the mixed gas of the gas circuit breaker according to the present embodiment. It is. From FIG. 14, the gas pressure distribution of the gas circuit breaker in which the opening vent hole 24 having the stepwise width dimension according to the present embodiment is formed is changed to the opening vent hole 24 having the uniform width dimension according to the first embodiment. It is evident that this is an improvement over the gas circuit breaker formed with. The reason why the gas pressure distribution can be improved in this embodiment is as follows.

First, in the gas circuit breaker according to the first embodiment, the opening vent 24 and the opening 16
The overlapping area (opening area) increases almost in proportion to the rotation angle of the rotary shutter 20, so that the opening area increases after the middle opening operation, so that the pressure in the compression chamber 13 decreases and the target The pressure of the mixed gas in the compression chamber 13 at the current zero point cannot be kept high.

On the other hand, in the present embodiment, the width of the opening ventilation hole 24 is increased stepwise in the rotation direction of the rotary shutter 20 during the opening operation. An increase in area can be suppressed, and the amount of mixed gas ejected from the opening 16 can be reduced. Thereby, the gas pressure in the compression chamber 13 can be maintained at a higher pressure in the period from the opening middle stage operation to the cutoff target current zero point.

Therefore, according to the present embodiment, in addition to obtaining the same effect as that of the gas circuit breaker according to the first embodiment, the area of the opening ventilation hole 24 is further increased stepwise. As a result, the mixed gas in the compression chamber 13 can be maintained at a higher pressure over the period from the opening operation in the middle stage to the shutoff target current zero point, leading to an improvement in shutoff performance.

[Sixth Embodiment] FIG. 15 is a partial structural view showing the vicinity of a closing plate of a gas circuit breaker according to a sixth embodiment of the present invention, and in particular, is a front view of the closing plate in a closed state. . In FIG. 15, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals.

As shown in FIG. 15, in the gas circuit breaker according to the present embodiment, similarly to the above-described fifth embodiment, the width dimension (dimension in the radial direction of the rotary shutter 20) of the opening vent hole 24 is opened. This is increased in the rotation direction of the rotary shutter 20 during operation, but the type of increase is different.
That is, in the fifth embodiment, the width of the opening ventilation hole 24 is gradually increased, but in the present embodiment, the width of the opening ventilation hole 24 is gradually increased. As a basic example of such a gradual increase, an example is shown in which the width of the opening ventilation hole 24 is linearly increased to form the substantially trapezoidal opening ventilation hole 24.

The opening operation and closing operation of the gas circuit breaker according to this embodiment having such a configuration are exactly the same as those of the gas circuit breaker described in the first embodiment.
In the gas circuit breaker according to the present embodiment, the width of the opening ventilation hole 24 is gradually increased in the rotation direction of the rotary shutter 20 during the opening operation. The gas pressure distribution at the time can be further improved. That is, since the amount of the mixed gas ejected from the opening 16 can be reduced while suppressing an increase in the opening area after the middle opening operation, the compression chamber 13 is kept in the compression chamber 13 from the middle opening operation to the cutoff target current zero point. Can be maintained at a higher pressure.

Therefore, according to the present embodiment, in addition to the effect similar to the effect of the gas circuit breaker according to the first embodiment, the area of the opening ventilation hole 24 is further increased by gradually increasing the area. Similarly to the fifth embodiment, since the mixed gas in the compression chamber 13 can be maintained at a higher pressure in the period from the opening middle stage operation to the shutoff target current zero point, the shutoff performance is improved.

[Seventh Embodiment] FIG. 16 is a partial structural view showing the periphery of a rotary shutter of a gas circuit breaker according to a seventh embodiment of the present invention. In particular, FIG. is there. Note that, in FIG. 16, the same or corresponding parts as those of the above-described first embodiment are denoted by the same reference numerals.

As shown in FIG. 16, in the gas circuit breaker according to this embodiment, the width dimension (dimension in the axial direction of the rotary shutter 20) of the through hole 23 is changed in the rotation direction of the rotary shutter 20. It is. That is, the through hole 2
The width dimension of the opening 3 when the opening 17 overlaps with the opening 17
In this embodiment, the width dimension of the through hole 23 is increased stepwise in the rotation direction of the rotary shutter 20 during the opening operation. It is. In FIG. 16, as a basic example of such a stepwise increase, the width dimension of the through-hole vent hole 23 is set in two stages to form the substantially T-shaped through-hole vent hole 23. An example is shown.

The opening and closing operations of the gas circuit breaker according to this embodiment having such a configuration are exactly the same as those of the gas circuit breaker described in the first embodiment.
In the gas circuit breaker according to the present embodiment, the gas pressure distribution during the opening operation can be further improved. Hereinafter, the improvement of the gas pressure distribution will be described with reference to FIG.

FIG. 17 is a pressure distribution diagram showing the pressure distribution of the mixed gas in the gas circuit breaker according to the first embodiment and the pressure distribution of the mixed gas in the gas circuit breaker according to the present embodiment in comparison. It is. From FIG. 17, the gas pressure distribution of the gas circuit breaker in which the through-hole vent hole 23 having the stepwise width according to the present embodiment is formed is the same as the through-hole passage having the uniform width according to the first embodiment. It is clear that the improvement is made as compared with the gas circuit breaker in which the pores 23 are formed. The reason why the gas pressure distribution can be improved in this embodiment is as follows.

First, in the gas circuit breaker according to the first embodiment, the opening vent 23 and the opening 17
Since the overlapping area (opening area) increases almost in proportion to the rotation angle of the rotary shutter 20, the arc area flowing from the opening 17 increases when the opening area increases after the middle opening operation. 15 increases the heated mixed gas. As a result, the pressure of the mixed gas in the compression chamber 13 rises sharply, and the amount of the mixed gas ejected from the opening 16 also increases. Therefore, it is possible to maintain the pressure of the mixed gas in the compression chamber 13 at the cutoff target current zero point high. Can not.

On the other hand, in the present embodiment, the width of the opening portion ventilation hole 23 is gradually increased in the rotation direction of the rotary shutter 20 during the opening operation. An increase in the passage area can be suppressed, and the amount of the mixed gas flowing from the passage portion 17 can be reduced. As a result, the amount of gas ejected from the opening 16 can be suppressed. Thereby, the gas pressure in the compression chamber 13 can be maintained at a higher pressure in the period from the opening middle stage operation to the cutoff target current zero point.

Therefore, according to the present embodiment, in addition to the effect similar to the effect of the gas circuit breaker according to the first embodiment, the area of the through-hole vent hole 23 is further increased stepwise. By doing so, the mixed gas in the compression chamber 13 can be maintained at a higher pressure during the period from the opening middle stage operation to the shutoff target current zero point, which leads to an improvement in shutoff performance.

[Eighth Embodiment] FIG. 18 is a partial configuration diagram showing the periphery of a rotary shutter of an eighth embodiment of the gas circuit breaker according to the present invention. In particular, FIG. is there. In FIG. 18, the first
Portions that are the same as or correspond to the components of the embodiment are denoted by the same reference numerals.

As shown in FIG. 18, in the gas circuit breaker according to the present embodiment, similarly to the above-described fifth embodiment, the width dimension (dimension in the axial direction of the rotary shutter 20) of the through hole 23 is opened. This is increased in the rotation direction of the rotary shutter 20 at the time of the polar operation, but the type of increase is different.
That is, in the seventh embodiment, the width of the through hole 23 is increased stepwise, but in the present embodiment, the width of the through hole 23 is gradually increased. In FIG. 1, as an example of such a gradual increase, there is shown an example in which the width of the through hole 23 is linearly increased to form the substantially trapezoidal through hole 23.

The opening operation and closing operation of the gas circuit breaker according to this embodiment having such a configuration are exactly the same as those of the gas circuit breaker described in the first embodiment.
In the gas circuit breaker according to the present embodiment, the width dimension of the opening portion ventilation hole 23 is gradually increased in the rotation direction of the rotary shutter 20 at the time of the opening operation. The gas pressure distribution during operation can be further improved. That is, it is possible to suppress an increase in the opening area after the middle opening operation and to reduce the amount of the mixed gas flowing from the opening 17, thereby suppressing the amount of gas ejected from the opening 16. The gas pressure in the compression chamber 13 can be maintained at a higher pressure over a period from to the zero point of the cutoff target current.

Therefore, according to the present embodiment, in addition to the effect similar to that of the gas circuit breaker according to the first embodiment, the area of the through hole 23 is further increased. Accordingly, similarly to the seventh embodiment, the mixed gas in the compression chamber 13 can be maintained at a higher pressure in the period from the opening middle stage operation to the shutoff target current zero point, which leads to improvement of the shutoff performance.

[Ninth Embodiment] FIG. 19 is a partial structural view showing the periphery of a closing plate of a gas circuit breaker according to a ninth embodiment of the present invention, and in particular, is a front view of the closing plate in a closed state. . In FIG. 19, the same reference numerals are given to the same or corresponding portions as the components of the first embodiment described above.

As shown in FIG. 19, in the gas circuit breaker according to the present embodiment, the closing plate 22 is formed so as to separate a plurality of closing portions 28 arranged at substantially equal intervals from the adjacent closing portions 28. And a plurality of cutout portions 29 formed as described above. Here, each cutout portion 29 corresponds to the opening portion ventilation hole 24 of each embodiment described above, and similarly forms an opening portion ventilation hole. In FIG. 19, as an example, nine openings 16 are provided in the movable cylinder 6 and the closing plate 22 is provided.
Is composed of nine closed portions 28 and nine notched portions 29.

The opening and closing operations of the gas circuit breaker according to this embodiment having such a configuration are exactly the same as those of the gas circuit breaker described in the first embodiment. However, in the gas circuit breaker according to the present embodiment, since the opening portion of the closing plate 22 is formed as the cutout portion 29, the gas circuit breaker is closed compared with the case where the opening portion is formed as the opening hole 24. Processing of the plate 22 is facilitated.

Therefore, according to the present embodiment, in addition to obtaining the same effects as those of the gas circuit breaker according to the first embodiment, the gas breaker can be easily machined. Since the productivity of circuit breakers can be improved, it leads to cost reduction.

[Tenth Embodiment] FIG. 20 is a partial structural view showing the periphery of a closing plate of a gas circuit breaker according to a tenth embodiment of the present invention, and in particular, is a front view of the closing plate in a closed state. . In FIG. 20, the same reference numerals are given to the same or corresponding portions as the components of the first embodiment.

As shown in FIG. 20, the gas circuit breaker according to the present embodiment is similar to the ninth embodiment described above in that the closing plate 2
2 is composed of a plurality of closed portions arranged at substantially equal intervals and a plurality of notched portions 27 formed so as to cut off between adjacent closed portions 28. different. That is, in the ninth embodiment, the width dimension (dimension in the radial direction of the rotary shutter 20) of the cutout portion 29 is made uniform in the rotation direction of the rotary shutter 20, but in the present embodiment, the fifth embodiment described above is used. As in the case of the opening ventilation hole 24, the width of the notch 29 is gradually increased in the rotation direction of the rotary shutter 20 during the opening operation. FIG. 20 shows an example in which the width of the notch 29 is set in two steps to form a substantially L-shaped notch 29 as a basic example of such a stepwise increase. I have.

The opening and closing operations of the gas circuit breaker according to this embodiment having such a configuration are exactly the same as those of the gas circuit breaker described in the first embodiment.
In the gas circuit breaker according to the present embodiment, the ninth
As in the embodiment, by forming the opening vent of the closing plate 22 as the notch 29, the processing of the closing plate 22 becomes easier as compared with the case of forming the opening vent 24.

Further, in the gas circuit breaker according to the present embodiment, the width dimension of the notch 29 serving as the opening vent is gradually increased in the rotation direction of the rotary shutter 20 during the opening operation. Therefore, similarly to the fifth embodiment, the gas pressure distribution during the opening operation can be further improved. That is, since the amount of the mixed gas ejected from the opening 16 can be reduced while suppressing an increase in the opening area after the middle opening operation, the compression chamber 13 is kept in the compression chamber 13 from the middle opening operation to the cutoff target current zero point. Can be maintained at a higher pressure.

Therefore, according to the present embodiment, in addition to obtaining the same effects as those of the gas circuit breaker according to the first embodiment, furthermore, as in the ninth embodiment, the processing of the closing plate 22 is performed. Since the productivity of the gas circuit breaker can be improved by the ease of the above, the cost is also reduced. Moreover,
As in the fifth embodiment, the mixed gas in the compression chamber 13 can be maintained at a higher pressure in the period from the opening middle stage operation to the shutoff target current zero point, which leads to an improvement in the shutoff performance.

[Other Embodiments] The present invention is not limited to the above embodiments, and various other modifications can be made within the scope of the present invention. For example,
It is also possible to appropriately combine the plurality of embodiments described above, and in that case, the operations and effects described in each embodiment can be synergistically obtained. In addition, the specific configuration such as the number, arrangement, dimensions, and the like of the opening of the operation rod and the opening of the movable cylinder can be appropriately selected, and can be selected according to the specific configuration of such an opening or opening. Thus, the specific configuration such as the number, arrangement, dimensions, and the like of the through holes and the through holes of the rotating rod may be determined.

[0120]

As described above, according to the present invention, the rotary shutter provided on the outer periphery of the operating rod provides
By opening and closing the opening of the movable cylinder in addition to the opening of the operating rod, both the opening and the opening are closed during the initial operation of opening the electrode, causing unnecessary discharge of gas in the compression chamber. In addition, by opening the opening and the opening after the middle operation of opening the electrode and efficiently taking in the heat energy of the arc through the opening, the pressure in the compression chamber can be increased efficiently. Therefore, it is possible to provide a gas circuit breaker which is excellent in arc extinguishing performance, operation reliability, and mechanical reliability, and is excellent in breaking performance.

In the present invention, as described above,
Since sufficient arc extinguishing performance can be ensured even with a mixed gas, the ratio of SF ₆ gas in the mixed gas can be reduced. Therefore, the amount of SF ₆ gas used can be reduced when only SF ₆ gas is used or in comparison with a conventional mixed gas, and it can sufficiently cope with prevention of global warming.

[Brief description of the drawings]

FIG. 1 is a schematic cross section showing a first embodiment of a gas circuit breaker according to the present invention, showing a closed state.

FIG. 2 is a schematic cross-sectional view showing the first embodiment of the gas circuit breaker according to the present invention, showing a state in a middle stage of opening.

FIG. 3 is a schematic cross-sectional view showing a first embodiment of the gas circuit breaker according to the present invention, showing a state after the opening of the gas circuit breaker.

FIGS. 4A and 4B are diagrams showing the periphery of a rotary shutter in the gas circuit breaker shown in FIG. 1, wherein FIG. 4A is a side view of a rotary shutter portion, and FIG. 4B is a front view of a closing plate; Indicates the status.

FIGS. 5A and 5B are views showing the periphery of a rotary shutter in the gas circuit breaker shown in FIG. 1, wherein FIG. 5A is a side view of a rotary shutter portion, and FIG. Indicates a mid-term state.

FIGS. 6A and 6B are views showing the periphery of a rotary shutter in the gas circuit breaker shown in FIG. 1, wherein FIG. 6A is a side view of a rotary shutter portion, and FIG. 6B is a front view of a closing plate; Shows late state.

FIG. 7 is a pressure distribution diagram showing a conventional gas circuit breaker and the gas circuit breaker according to the first embodiment in comparison with a pressure distribution of a mixed gas.

FIG. 8 is a schematic cross-sectional view showing a second embodiment of the gas circuit breaker according to the present invention, showing a closed state.

9A and 9B are views showing the periphery of a rotary shutter in the gas circuit breaker shown in FIG. 4, wherein FIG. 9A is a side view of a rotary shutter portion, and FIG. 9B is a front view of a closing plate; Indicates the status.

10A and 10B are diagrams showing the periphery of a rotary shutter in the gas circuit breaker shown in FIG. 4, wherein FIG. 10A is a front view of a rotary shutter portion, and FIG. 10B is a front view of a closing plate; Shows late state.

FIG. 11 is a schematic cross-sectional view showing a third embodiment of the gas circuit breaker according to the present invention, showing a closed state.

FIG. 12 is a schematic cross-sectional view showing a fourth embodiment of the gas circuit breaker according to the present invention, showing a closed state.

FIG. 13 is a view showing the vicinity of a closing plate of a gas circuit breaker according to a fifth embodiment of the present invention, and is a front view of the closing plate in a closed state.

FIG. 14 is a pressure distribution diagram showing the pressure distribution of a mixed gas in the gas circuit breaker according to the first embodiment and the gas circuit breaker according to the fifth embodiment in comparison.

FIG. 15 is a view showing the vicinity of a closing plate of a gas circuit breaker according to a sixth embodiment of the present invention, and is a front view of the closing plate in a closed state.

FIG. 16 is a view showing the periphery of a rotary shutter of a gas circuit breaker according to a seventh embodiment of the present invention, and is a side view of the rotary shutter in a closed state.

FIG. 17 is a pressure distribution diagram showing the pressure distribution of the mixed gas in the gas circuit breaker according to the first embodiment and the gas circuit breaker according to the seventh embodiment in comparison.

FIG. 18 is a view showing the periphery of a rotary shutter of an eighth embodiment of the gas circuit breaker according to the present invention, and is a side view of the rotary shutter in a closed state.

FIG. 19 is a view showing the periphery of a closing plate of a ninth embodiment of the gas circuit breaker according to the present invention, and is a front view of the closing plate in a closed state.

FIG. 20 is a view showing the vicinity of a closing plate of a gas circuit breaker according to a tenth embodiment of the present invention, and is a front view of the closing plate in a closed state.

FIG. 21 is a schematic cross-sectional view showing a closed state of a conventional gas circuit breaker.

FIG. 22 is a schematic cross-sectional view showing a middle state of opening of the gas circuit breaker of FIG. 21.

23 is a schematic cross-sectional view showing the gas circuit breaker of FIG.

FIG. 24 is a pressure distribution diagram showing a pressure distribution of a mixed gas in a conventional gas circuit breaker in a case where the closing plate 18 is not provided and in a case where the closing plate 18 is provided.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container 2 ... Fixed contact part 3 ... Movable contact part 4 ... Fixed arc contact 5 ... Fixed energizing contact 6 ... Movable cylinder 7 ... Operating rod 8 ... Movable arc contact 9 ... Nozzle 10 ... Movable energizing contact 11 ... Piston support part 12 ... Piston 13 ... Compression chamber 14 ... Throttle channel 15 ... Arc 16 ... Opening part 17 ... Port opening 18 ... Clogging plate 19 ... Elastic body 20 ... Rotary shutter 20a ... First rotary shutter 20b ... Second rotation Shutter 21 ... Clogging cylinder 21a ... First closing cylinder 21b ... Second closing cylinder 22 ... Closing plate 22a ... First closing plate 22b ... Second closing plate 23 ... Vent opening vent 23a ... First vent vent 23b ... Second through-hole ventilation hole 24 ... Opening portion ventilation hole 24a ... First opening portion ventilation hole 24b ... Second opening portion ventilation hole 25 ... Guide groove 25a ... First guide groove 25b ... Second guide groove 26 ... Guide protrusion 2 ... end 28 ... closing portion 29 ... cutout portion

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshinobu Taniguchi 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Hamakawasaki Plant (72) Inventor Katsuharu Iwamoto 2-Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa No. 1 Inside Toshiba Hamakawasaki Plant (72) Inventor Kenji Arai No. 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside F-term (reference) 5G001 AA01 BB03 CC03 DD03 EE06

Claims (9)

[Claims] 1. A fixed contact portion and a movable contact portion are disposed opposite to each other in a container filled with an arc-extinguishing gas, and the movable contact portion includes at least a movable cylinder and an inside of the movable cylinder. A fixed hollow operating rod, an insulating nozzle for blowing gas fixed to the tip of the movable cylinder, and a piston fixed to the container, the piston and the movable cylinder being relatively The moving rod is configured to compress the arc-extinguishing gas in the compression chamber formed by the movable cylinder, the operation rod, and the piston, and the operation rod communicates with the inside and outside of the compression chamber. An opening for ejecting the arc-extinguishing gas compressed in the compression chamber into the nozzle is formed at a tip of the movable cylinder. In a gas circuit breaker provided with a closing means for closing at the time of the initial operation of opening the electrode, the closing means is disposed on an outer periphery of the operation rod and closes the opening portion with a cylindrical closing cylinder. A rotary shutter having an annular closing plate fixedly closed to close the opening, the rotary shutter being configured to be rotatable with respect to the operating rod and to be able to interlock in the axial direction; A guide groove for rotating the rotary shutter between an open position and a closed position using relative movement between the rotary shutter and the piston, and communicating with the passage portion when the rotary shutter is at the open position. An opening portion ventilation hole is provided, and the closing plate is provided with an opening portion ventilation hole communicating with the opening portion when the rotary shutter is at the open position. The piston is engaged with the guide groove. Join A gas circuit breaker, comprising a guide protrusion. 2. The guide groove is formed in parallel with the axis of the closing cylinder to prevent rotation of the rotary shutter, and is formed so as to draw a substantially spiral shape with respect to the axial direction of the closing cylinder. 2. The gas circuit breaker according to claim 1, wherein said gas circuit breaker is combined with a helical portion for rotating said rotary shutter. 3. The opening ventilation port, wherein the opening ventilation opening starts opening the opening by rotation of the rotary shutter during the opening operation. The gas circuit breaker according to claim 1 or 2, wherein the opening of the opening is started after the opening is further rotated. 4. The rotary shutter according to claim 1, wherein the rotary shutter includes a plurality of rotary shutters arranged inside and outside so as to be substantially coaxial. Gas circuit breaker. 5. The groove according to claim 1, wherein the guide groove is formed as a groove having a bottom on the surface of the closing cylinder, not a notch groove penetrating the closing cylinder. The gas circuit breaker according to any one of the above. 6. The gas circuit breaker according to claim 1, wherein a plurality of sets each including the guide groove and the guide protrusion are provided. 7. The opening ventilation hole, which determines an opening width dimension of the opening when it overlaps with the opening, has an effective width dimension of the rotation shutter which is set at the time of opening operation. The gas circuit breaker according to any one of claims 1 to 6, wherein the gas circuit breaker is formed so as to increase in one of a stepwise increase and a gradual increase in the rotation direction. 8. The opening portion of the opening portion, which determines the opening width of the opening portion when the opening portion overlaps with the opening portion, has an effective width dimension at the time of opening operation. The gas circuit breaker according to any one of claims 1 to 7, wherein the gas circuit breaker is formed so as to increase in one of a stepwise increase and a gradually increase in a rotation direction of the rotary shutter. 9. The closing plate, wherein a plurality of closing portions arranged at substantially equal intervals in an annular direction and a plurality of notches formed so as to cut off between adjacent closing portions to constitute the opening portion vent. The gas circuit breaker according to any one of claims 1 to 8, wherein the gas circuit breaker is constituted by a part.