JP2004079249A - Gas-blast circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas-blast circuit breaker capable of enhancing reliability of a cam, roller and a ring by absorbing force acting on the roller and the side of the cam, capable of lightening the cam and reducing its cost, and also capable of displaying excellent breaking performance by making a gas stream flow smoothly by miniaturizing the cam. <P>SOLUTION: A piston 21 is rigidly combined with one end of a counter arc electrode 7, and is fitted to a vessel 1 or a current carrying support part 13. The piston 1 is inserted in a cylinder 22, and a shock-absorbing device 20 is formed of the piston 21 and cylinder 22. An elastic body 23 one end of which is rigidly combined with the vessel 1 or the current carrying support part 13 and the other end of which is engaged with the piston 21 is disposed in the cylinder 22. In other words, the elastic body 23 is stored in a closed space formed between the piston 21 and the cylinder 22. An arc-extinguishing gas is also filled in the closed space. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas circuit breaker used in a substation or a switchgear of a power system, and particularly to an arc extinction chamber for improving the breaking performance without increasing the driving energy of the circuit breaker, which is generated during operation. The present invention relates to a gas circuit breaker with reduced impact force.
[0002]
[Prior art]
In recent years, it has been required to reduce the driving energy of the gas circuit breaker. Specifically, a structure as shown in the cross-sectional views of FIGS. 9 and 10 has been proposed (application number P2001-304665). ). FIG. 9 shows a closed state, and FIG. 10 shows an opened state. That is, the arc-extinguishing gas is sealed in the container 1, and the movable electrode 4, which can be freely attached and detached, and the opposing energizing electrode 5 are arranged and accommodated in the container 1. A movable arc electrode 6, an insulating nozzle 8, and an operation rod 31 are fitted to the movable electrode 4, respectively. The movable electrode 4 is provided with a pressure chamber 10 for pressurizing the arc-extinguishing gas. The pressure chamber 10 is provided with a gas passage 11 between the movable arc electrode 6 and the inner surface of the insulating nozzle 8 and a throat portion. 9 communicates with the discharge chamber 12 downstream of the throat section 9.
[0003]
The opposing energizing electrode 5 is supported by the energizing support 13, and is electrically connected to the opposing arc electrode 7 via the sliding contact 14. A compression spring 55 is disposed coaxially with the opposing arc electrode 7 inside the energization support portion 13, and the left end of the compression spring 55 is held by a ring 56 a fixed on the opposing arc electrode 7. The right end of the compression spring 55 is held by a movable ring 56 slidably mounted on the opposing arc electrode 7. Further, a cam member 60 capable of moving left and right along the operation axis of the opposing arc electrode 7 is provided inside the energization support portion 13, and the right end thereof can be brought into contact with and separated from the tip of the insulating nozzle 8. . A cam 61 having a curved surface is attached to the left end of the cam member 60, and a stopper 62 for supporting the movable ring 56 is attached to an intermediate portion of the cam 61. Further, a link device 70 is provided inside the power supply support portion 13, and links 72 and 73 are rotatably connected to each other via a roller 71. The roller 71 slides along the shape of the cam 61, and the other end of the link 72 is at the left end of the opposing arc electrode 7, and the other end of the link 73 is a link support point fixed to the power supply support 13. 74 are connected to each other so as to be freely rotatable.
[0004]
Next, the operation of the gas circuit breaker configured as described above will be described with reference to FIGS. FIG. 9 shows a closed state of the gas circuit breaker, in which the movable electrode 4 and the opposite conducting electrode 5 are in contact with each other, and the movable arc electrode 6 and the opposite arc electrode 7 are in contact with each other. At this time, the tip of the insulating nozzle 8 presses the cam member 60, and this position is held by a driving unit (not shown). The cam 61 of the cam member 60 has a curved surface shape that spreads outward toward the left, and in the inserted state, the narrowest position in the radial direction is in contact with the roller 71 of the link device 70. For this reason, the angle formed by the links 72 and 73 becomes large, and the opposing arc electrode 7 connected to the link 72 is pushed rightward and is kept fitted to the movable arc electrode 6. The compression spring 55 held from both ends by the ring 56a and the movable ring 56 is in an energized state. The movable ring 56 and the upper end of the sliding contact portion 14 engage with the stopper 62 so as to maintain a small gap 57. The roller 71 of the link device 70 is held by a linear portion 61a parallel to the operating axis of the cam 61 so as not to spread outward.
[0005]
In the above state, when a shutoff command is given, the drive unit drives the movable electrode 4 via the operation rod 31, and the insulating nozzle 8 moves in the shutoff direction. At this time, since the accumulated force of the compression spring 55 acts on the cam member 60 via the movable ring 56 and the stopper 62, the cam member 60 moves rightward. When the linear portion 61a of the cam 61 comes off the roller 71, the roller 71 can move together with the links 72 and 73 so as to spread outward. The opposing arc electrode 7 moves to the left at a high speed due to the stored energy of the compression spring 55 acting via the ring 56a at the left end of the opposing arc electrode 7. At the same time, the movable electrode 4 side is also accelerated, and the separation speed between the movable arc electrode 6 and the opposing arc electrode 7 relatively increases. Also, the tip of the insulating nozzle 8 is separated from the right end of the cam member 60, and both are separated.
[0006]
After the cam member 60 has moved through the small gap 57, the movable ring 56 stops contacting the sliding contact portion 14, and the engagement with the stopper 62 is released. The length of the small gap 57 is set slightly longer than the linear portion 61a of the cam 61. Thereafter, the angles formed by the links 72 and 73 are reduced, and the cam member 60 is further pushed rightward by using the component force spreading outward.
[0007]
In the cutoff state shown in FIG. 10, the arc generated between the movable arc electrode 6 and the opposed arc electrode 7 is extinguished by the gas flow guided from the pressure chamber 10 via the gas flow path 11 and the throat section 9. Further, the cam member 60 stops when the stopper 62 comes into contact with the lower end portion of the current-carrying support member 13. The compression spring 55 is almost released, and the links 72 and 73 are held at the position where the shape of the cam 61 is maximized.
[0008]
Subsequently, in the closing operation, the movable electrode section 52 in FIG. 10 is driven leftward by a drive section (not shown), and the tip of the insulating nozzle 8 contacts the cam member 60 on the way. The roller 71 moves inward along the shape of the cam 61 pushed up, and the opposing arc electrode 7 moves in the closing direction by the links 72 and 73. At the same time, the compression spring 55 is energized, and when the operation is completed, the roller 71 rides on the linear portion 61a of the cam 61, and restrains the accumulated movement of the compression spring 55. Immediately before that, the stopper 62 engages with the movable ring 56 to push up the lower end of the compression spring 55, and secures the length of the small gap 57 necessary as a release trigger at the time of the shut-off operation. In the above description, a configuration in which only the opposing arc electrode 7 is driven has been described, but a configuration in which the opposing arc electrode 7 and the opposing energizing electrode 5 are connected by a rigid body and both are driven is also possible.
[0009]
[Problems to be solved by the invention]
However, the gas circuit breaker thus configured has the following problems. [1] During the breaking operation, the opposing arc electrode is geometrically forcibly stopped by the side surface of the cam via the link device. Therefore, a large impact force acts on the cam. Therefore, the reliability of the cam, the roller, and the link is reduced. The reason is that the link device used in the conventional gas circuit breaker is a kind of a booster mechanism, and the inertia force of the opposed arc electrode and the force of the compression spring are amplified and act on the roller and the cam side surface.
[0010]
[2] To make the cam withstand the impact force acting on the roller and the side surface of the cam, it is necessary to increase the size and strengthen the material by using an expensive material. .
[3] If the size is increased to strengthen the cam, the flow of gas is obstructed, and the blocking performance is reduced.
[0011]
SUMMARY OF THE INVENTION The present invention has been proposed to solve the above problems, and an object of the present invention is to improve the reliability of a cam, a roller and a link by absorbing a force acting on a roller and a side surface of a cam, and to reduce the weight of the cam. It is another object of the present invention to provide a gas circuit breaker which can reduce the cost and, at the same time, reduce the size of the cam so that the gas flow can flow smoothly and exhibit excellent blocking performance.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the inventions of claims 1 and 2 disclose a movable electrode and a counter arc electrode which can be freely contacted and separated from each other in a container in which an arc-extinguishing gas is sealed. A pressure chamber for storing an arc-extinguishing gas pressurized at the time of driving is attached to one end of the operation rod, an insulating nozzle is fixed to the pressure chamber, and the pressurized gas in the pressure chamber is supplied at a higher speed than the insulating nozzle. A stream is ejected as a flow to blow and extinguish an arc generated between the two opposed electrodes, and a compression spring for driving the opposed arc electrode relatively in a separating direction is coaxially arranged. Connecting one end of a first link to the opposing arc electrode, connecting one end of a second link to a support point provided in the container, and freeing the other ends of the first and second links to rotate with each other. And the operation of the opposed arc electrode A cam that is driven in parallel by moving one end thereof into contact with the tip of the insulating nozzle, and a roller is provided at a connection point between the first link and the second link. By sliding along, the opposing arc electrode is displaced in the opposite direction to the movable electrode, and the compression spring is stored when the two opposing electrodes are driven relatively in the closing direction. The gas circuit breaker has the following features.
[0013]
The invention according to claim 1 is provided with a shock absorber comprising a piston provided on the opposed arc electrode and a cylinder into which the piston can be inserted, and the arc-extinguishing gas is contained in a closed space formed between the piston and the cylinder. The shock absorber is characterized in that the shock absorber is configured to compress the arc-extinguishing gas by moving the piston in the cylinder to generate a shock-absorbing force.
According to the second aspect of the present invention, the closed space between the piston and the cylinder is not filled with the arc-extinguishing gas but the elastic member is housed, and the shock absorber including the piston and the cylinder compresses the elastic member by moving the piston in the cylinder. And a buffering force is generated.
[0014]
According to the first and second aspects of the present invention, when the movable electrode is driven by the driving device during the breaking operation, the opposing arc electrode is driven in the opposite direction to the movable electrode by the compression spring, the cam and the two links. A piston provided on the arc electrode enters the cylinder. Therefore, a braking force is applied to the opposing arc electrode by an increase in the gas pressure of the arc-extinguishing gas in the closed space formed between the piston and the cylinder or by the elastic force of the elastic member. That is, most of the inertial force and compression spring force of the opposing arc electrode can be absorbed by the shock absorber including the piston and the cylinder. Therefore, the impact force generated between the side surface of the cam and the roller is greatly reduced. Thus, it is not necessary to use a strong cam, and the performance of the gas circuit breaker can be improved with a small and simple configuration.
[0015]
According to a third aspect of the present invention, in the gas circuit breaker according to the first or second aspect, the piston is disposed so as to be able to freely contact and separate from one end of the opposed arc electrode. According to the third aspect of the invention, since the opposed arc electrode and the piston are separated, an increase in the weight of the opposed arc electrode can be prevented. Therefore, the weight and performance of the circuit breaker can be reduced.
[0016]
According to the fourth and fifth aspects of the present invention, the movable electrode and the opposing arc electrode which can be freely contacted and separated are arranged in a container in which the arc-extinguishing gas is sealed, and the movable electrode and the opposing arc electrode are pressurized at the time of driving. A pressure chamber for storing the extinguishing gas is attached to one end of the operating rod, an insulating nozzle is fixed to the pressure chamber, and the pressurized gas in the pressure chamber is jetted out of the insulating nozzle as a high-speed gas flow so as to be opposed to the pressure chamber. A compression spring configured to blow and extinguish the arc generated between the two electrodes, and to drive the opposed arc electrode and the opposed energized electrode fixed to the opposed arc electrode in a relatively separating direction. Coaxially disposed, one end of a first link is connected to the opposing arc electrode, and one end of a second link is connected to a support point provided in the container. Ends can be freely connected to each other Providing a cam that moves in parallel with the operating axis of the opposing arc electrode, one end of which is driven by contacting the tip of the insulating nozzle, and a roller provided at a connection point between the first link and the second link; When the roller slides along the side surface of the cam, the opposed arc electrode is displaced in a direction opposite to the movable electrode. When the two opposed electrodes are driven relatively in the closing direction, the compression is performed. A gas circuit breaker configured to store a spring has the following features.
[0017]
According to a fourth aspect of the present invention, there is provided a shock absorber comprising a ring-shaped piston provided at an end of the counter-current-carrying electrode and a ring-shaped cylinder into which the piston can be inserted. An electrode is slidably fixed to a current-carrying support portion, and a closed space formed between the piston and the cylinder is filled with the arc-extinguishing gas. The buffer device moves the piston through the cylinder. The arc-extinguishing gas is compressed to generate a buffering force.
According to the fifth aspect of the present invention, similarly to the second aspect of the present invention, the closed space between the piston and the cylinder is not filled with an arc-extinguishing gas but an elastic member is housed therein. The movement of the piston compresses the elastic member to generate a buffering force.
[0018]
The inventions of Claims 4 and 5 have the same configuration as the inventions of Claims 1 and 2, except that the piston is provided not on the opposed arc electrode but on the opposed energized electrode. That is, when the movable electrode is driven by the driving device during the breaking operation, the opposing arc electrode is driven in the direction opposite to the movable electrode by the compression spring, the cam, and the two links, and the piston provided on the opposing energized electrode is inserted into the cylinder. enter in. For this reason, a braking force is applied to the opposing energized electrode by an increase in the gas pressure of the arc-extinguishing gas in the closed space formed between the piston and the cylinder or by the elastic force of the elastic member. That is, most of the inertial force of the opposing energizing electrode and the opposing arc electrode can be absorbed by the shock absorber including the piston and the cylinder. Therefore, the impact force generated between the side surface of the cam and the roller is greatly reduced. Thus, it is not necessary to use a strong cam, and the performance of the gas circuit breaker can be improved with a small and simple configuration.
[0019]
According to a sixth aspect of the present invention, in the gas circuit breaker according to the fourth or fifth aspect, the piston is disposed so as to be able to freely contact with and be separated from one end of the opposed current-carrying electrode.
According to the sixth aspect of the present invention, since the opposing energizing electrode and the piston are separated, an increase in the weight of the opposing energizing electrode can be prevented. Therefore, it leads to weight reduction and performance improvement of the circuit breaker.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an embodiment of a gas circuit breaker according to the present invention will be described with reference to the drawings and reference numerals in the drawings. In addition, the same reference numerals are given to the same or corresponding components as those described in the related art, and description thereof will be omitted.
[0021]
(1) First Embodiment [Configuration]
The first embodiment corresponds to the first and second aspects of the present invention. FIG. 1 is a cross sectional view showing the first embodiment in a closed state, and FIG. The state is shown. The configurational features of the first embodiment are as follows. A piston 21 is fixed to one end of the opposing arc electrode 7, and is fitted to the container 1 or the power supply support 13. The piston 21 is inserted into the cylinder 22, and the piston 21 and the cylinder 22 constitute the shock absorber 20. An elastic body 23 having one end fixed to the container 1 or the power supply support 13 and the other end engaged with the piston 21 is disposed inside the cylinder 22. That is, the elastic body 23 is housed in a closed space formed between the piston 21 and the cylinder 22. The closed space is also filled with an arc-extinguishing gas.
[0022]
[Effects]
Next, the operation and effect of the first embodiment will be described with reference to FIGS. In the first embodiment, when a shutoff command is input, the operating rod 31 is moved in the direction of arrow 38 by the driving force of a driving unit (not shown) as shown in FIG. The movable electrode 4 is driven through the insulating nozzle 8, and the insulating nozzle 8 moves in the blocking direction. The operation of the cam 61 and the links 72 and 73 in the shutoff operation is the same as in the conventional example.
[0023]
In the latter half of the shut-off operation, the arc-extinguishing gas in the closed space formed by the piston 21 and the cylinder 22 is compressed as the piston 21 moves, and the pressure increases. This pressure becomes a force for pushing the piston 21, that is, a braking force, and is used to stop the opposing arc electrode 7. Further, when the elastic body 23 is engaged with the piston 21, an elastic force is generated and serves as a braking force for stopping the opposing arc electrode 7. FIG. 2 shows the end state of the shutoff operation described above. In the closing operation, a driving force acts in the direction of arrow 39 in FIG. 2 and moves in a direction completely opposite to the shut-off operation. The operation can be easily estimated from the description of the prior art and the above-described shut-off operation. Omitted.
[0024]
As described above, according to the first embodiment, the damping device 20 having a simple structure applies a braking force to the opposing arc electrode 7 to reduce the impact force generated between the side surface of the cam 61 and the roller 71. be able to. Therefore, the reliability of the cam 61, the roller 71, and the links 72 and 83 is improved, and the increase in size and weight and the increase in cost due to the strengthening of the cam 61 can be prevented. Further, since the increase in the size of the cam 61 can be suppressed, it is possible to ensure excellent blocking performance without obstructing the gas flow.
[0025]
(2) Second embodiment [Configuration]
The second embodiment corresponds to the third aspect of the present invention. FIG. 3 is a cross-sectional view showing the second embodiment, showing a closed state, and FIG. 4 is an open state of FIG. ing. In the second embodiment, a part of the configuration of the first embodiment is modified, and the same or corresponding portions are denoted by the same reference numerals. The second embodiment is characterized in that the piston 21 is disposed so as to be able to freely contact and separate from one end of the opposed arc electrode 7. That is, the cylinder 22 is provided with a projection 22a for restraining the movement of the piston 21, and the return spring 22b always pushes the piston 21 in the direction of the projection 22a.
[0026]
[Effects]
The operation and effect of the second embodiment are as follows. In the latter half of the breaking operation, one end of the opposing arc electrode 7 engages with the end of the piston 21 and moves in the same direction. Thereafter, the arc-extinguishing gas in the closed space formed by the piston 21 and the cylinder 22 is compressed as the piston 21 moves, and the pressure increases. This pressure becomes a force for pushing the piston 21, that is, a braking force, and is used to stop the opposing arc electrode 7. Further, when the elastic body 23 is engaged with the piston 21, an elastic force is generated and serves as a braking force for stopping the opposing arc electrode 7. FIG. 4 shows the state in which the shutoff operation is completed as described above. In the closing operation, a driving force acts in the direction of arrow 39 in FIG. However, the piston 21 moves away from the opposing arc electrode 7 and moves in the direction of the projection 22a by the spring force of the return spring 22b.
[0027]
According to the second embodiment described above, in addition to the functions and effects of the first embodiment, the separation of the opposed arc electrode 7 and the piston 21 prevents an increase in the weight of the opposed arc electrode. it can. For this reason, it is possible to contribute to reducing the weight of the circuit breaker and improving the breaking performance.
[0028]
(3) Third Embodiment [Configuration]
The third embodiment corresponds to the fourth and fifth aspects of the present invention. FIG. 5 is a cross-sectional view showing the third embodiment in a closed state, and FIG. 6 is an open state in FIG. Is shown. In the third embodiment, the opposing energizing electrode 5 and the opposing arc electrode 7 are fixed and slidably supported by the energizing support 13. A ring-shaped piston 21 is fixed to the end of the opposite energizing electrode 5, and the piston 21 is inserted into a ring-shaped cylinder 22 fixed to the energizing support 13, and the piston 21 and the cylinder 22 Is configured. An elastic body 23 is disposed inside the cylinder 22. That is, the elastic body 23 is housed in a closed space formed between the piston 21 and the cylinder 22. The closed space is also filled with an arc-extinguishing gas.
[0029]
[Effects]
Next, the operation and effect of the third embodiment will be described with reference to FIGS. In the latter period of the shutoff operation, gas in a closed space formed by the piston 21 inserted into the cylinder 22 and the cylinder 22 is compressed as the piston 21 moves, and the pressure increases. This pressure becomes a force for pushing the piston 21, that is, a braking force, and is used to stop the counter-current-carrying electrode 5. Further, when the elastic body 23 is engaged with the piston 21, an elastic force is generated, which serves as a braking force for stopping the opposite energized electrode 5. FIG. 6 shows the end state of the shutoff operation described above. In the closing operation, a driving force acts in the direction of arrow 39 in FIG. 6 and moves in a direction completely opposite to the shut-off operation. Therefore, according to the third embodiment, a braking force can be applied to the opposing energizing electrode 5 by a mechanism using the shock absorber 20 having a simple structure. Accordingly, the impact force generated between the side surface of the cam 61 and the roller 71 can be reduced, and the size and weight and the cost increase due to the strengthening of the cam 61 can be prevented, thereby improving the reliability of the device. Further, since the increase in the size of the cam 61 can be suppressed, gas can flow smoothly, and excellent shutoff performance can be secured.
[0030]
(4) Fourth Embodiment [Configuration]
The fourth embodiment corresponds to the invention of claim 6, FIG. 7 is a cross-sectional view showing the fourth embodiment, and shows a closed state, and FIG. 8 shows an open state of FIG. ing. In the fourth embodiment, a part of the configuration of the third embodiment is changed, and the same or corresponding portions are denoted by the same reference numerals. The fourth embodiment is characterized in that the piston 21 is disposed so as to be able to be separated from and connected to one end of the opposite conducting electrode 5. That is, the cylinder 22 is provided with a protrusion 22a for restraining the movement of the piston 21, and the return spring 22b presses the piston 21 in the direction of the protrusion 22a.
[0031]
[Effects]
The operation and effect of the fourth embodiment are as follows. In the latter half of the shut-off operation, one end of the opposite energizing electrode 5 engages with the end of the piston 21 inserted into the cylinder 22, and moves in the same direction. Thereafter, the arc-extinguishing gas in the closed space formed by the piston 21 and the cylinder 22 is compressed as the piston 21 moves, and the pressure increases. This pressure becomes a force for pushing the piston 21, that is, a braking force, and is used to stop the counter-current-carrying electrode 5. Further, when the elastic body 23 is engaged with the piston 21, an elastic force is generated, which serves as a braking force for stopping the opposite energized electrode 5. FIG. 8 shows the end state of the shutoff operation described above. In the closing operation, a driving force acts in the direction of arrow 39 in FIG. 8 and moves in a direction completely opposite to the closing operation. However, the piston 21 moves away from the opposing arc electrode 7 and moves in the direction of the projection 22a by the spring force of the return spring 22b.
[0032]
According to the fourth embodiment described above, in addition to the functions and effects of the third embodiment, the weight of the opposing energizing electrode 5 can be increased by separating the opposing energizing electrode 5 from the piston 21. Can be prevented, leading to a lighter circuit breaker and improved performance.
[0033]
(5) Other Embodiments The present invention is not limited to the above embodiments, but only fills a closed space between a piston and a cylinder with an arc-extinguishing gas or accommodates an elastic member. Just let it do. Further, the configuration, arrangement, material, and the like of each member can be appropriately changed.
[0034]
【The invention's effect】
As described above, the gas circuit breaker according to the present invention is configured such that the two electrodes facing each other are moved relative to each other by the cam and the compression spring, and the shock absorber composed of a piston and a cylinder having a relatively simple structure is arranged on the counter electrode side. In addition to absorbing the impact force generated between the cam and roller, the reliability of the cam, roller and link is improved, the weight and cost of the cam are reduced, and the small size of the cam allows the gas flow to flow smoothly and is excellent. It is possible to exhibit a high blocking performance.
[Brief description of the drawings]
FIG. 1 is a cross sectional view showing a first embodiment according to the present invention, showing a closed state.
FIG. 2 shows an open state of FIG.
FIG. 3 is a cross-sectional view showing a second embodiment according to the present invention, showing a closed state.
FIG. 4 shows an open state of FIG. 4;
FIG. 5 is a cross-sectional view showing a third embodiment according to the present invention, showing a closed state.
FIG. 6 shows an open state of FIG. 5;
FIG. 7 is a cross-sectional view showing a fourth embodiment according to the present invention, showing a closed state.
FIG. 8 shows an open state of FIG. 7;
FIG. 9 is a cross-sectional view of a conventional gas circuit breaker, showing a closed state.
FIG. 10 shows an open state of FIG. 9;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Container 4 ... Movable electrode 5 ... Opposed energizing electrode 6 ... Movable arc electrode 7 ... Opposed arc electrode 8 ... Insulating nozzle 10 ... Compression chamber 11 ... Gas flow path 13 ... Energizing support 14 ... Sliding contact 20 ... Buffer 21 ... Piston 22 ... Cylinder 22a ... Protrusion 22b ... Return spring 23 ... Elastic body 31 ... Operating rod 38,39 ... Arrow 55 ... Compression spring 56 ... Movable ring 56a ... Ring 57 ... Small gap 60 ... Cam member 61 ... Cam 61a ... Linear portion 62 Stopper 70 Link device 71 Rollers 72, 73 Link 74 Link support point

Claims (6)

A movable electrode and a counter arc electrode which can be freely contacted and separated are arranged in a container sealed with the arc-extinguishing gas, and the movable electrode and a pressure chamber for storing the arc-extinguishing gas pressurized during driving. Is attached to one end of an operating rod, an insulating nozzle is fixed to the pressure chamber, and pressurized gas in the pressure chamber is ejected from the insulating nozzle as a high-speed gas flow to blow an arc generated between the two opposed electrodes. A compression spring for driving the opposed arc electrode relatively in a separating direction is coaxially arranged, and one end of a first link is connected to the opposed arc electrode; One end of a second link is connected to a support point provided therein, and the other ends of the first and second links are rotatably connected to each other. Contacts the tip of the insulating nozzle And a roller is provided at a connection point between the first link and the second link, and the roller slides along a side surface of the cam, thereby causing the opposing arc electrode to move with the movable electrode. In a gas circuit breaker configured to displace in the opposite direction and to accumulate the compression spring when two opposing electrodes are relatively driven in the closing direction,
A piston provided on the opposed arc electrode, and a shock absorber comprising a cylinder into which the piston can be inserted,
Filling the closed space formed between the piston and the cylinder with the arc-extinguishing gas,
A gas circuit breaker, wherein the shock absorber is configured to compress the arc-extinguishing gas by moving the piston in the cylinder to generate a shock absorbing force. A movable electrode and a counter arc electrode which can be freely contacted and separated are arranged in a container sealed with the arc-extinguishing gas, and the movable electrode and a pressure chamber for storing the arc-extinguishing gas pressurized during driving. Is attached to one end of an operating rod, an insulating nozzle is fixed to the pressure chamber, and pressurized gas in the pressure chamber is ejected from the insulating nozzle as a high-speed gas flow to blow an arc generated between the two opposed electrodes. A compression spring for driving the opposed arc electrode relatively in a separating direction is coaxially arranged, and one end of a first link is connected to the opposed arc electrode; One end of a second link is connected to a support point provided therein, and the other ends of the first and second links are rotatably connected to each other. Contacts the tip of the insulating nozzle And a roller is provided at a connection point between the first link and the second link, and the roller slides along a side surface of the cam, thereby causing the opposing arc electrode to move with the movable electrode. In a gas circuit breaker configured to displace in the opposite direction and to accumulate the compression spring when two opposing electrodes are relatively driven in the closing direction,
A piston provided on the opposed arc electrode, and a shock absorber comprising a cylinder into which the piston can be inserted,
An elastic member is housed in a closed space formed between the piston and the cylinder,
A gas circuit breaker, wherein the shock absorber is configured to generate a shock by compressing the elastic member by moving the piston in the cylinder. 3. The gas circuit breaker according to claim 1, wherein the piston is disposed so as to be able to freely contact and separate from one end of the opposed arc electrode. 4. A movable electrode and a counter arc electrode which can be freely contacted and separated are arranged in a container sealed with the arc-extinguishing gas, and the movable electrode and a pressure chamber for storing the arc-extinguishing gas pressurized during driving. Is attached to one end of an operating rod, an insulating nozzle is fixed to the pressure chamber, and pressurized gas in the pressure chamber is ejected from the insulating nozzle as a high-speed gas flow to blow an arc generated between the two opposed electrodes. Along with being constituted so as to extinguish and extinguish the arc, a compression spring for driving the opposing arc electrode and the opposing energizing electrode fixed to the opposing arc electrode relatively in a separating direction is coaxially arranged, and the opposing arc electrode is One end of a first link is connected, one end of a second link is connected to a support point provided in the container, and the other ends of the first and second links are rotatably connected to each other. For the operating axis of the arc electrode A cam that moves to a row and is driven by one end of the nozzle being in contact with the tip of the insulating nozzle; a roller is provided at a connection point between the first link and the second link; By sliding, the opposed arc electrode is displaced in the direction opposite to the movable electrode, and the compression spring is configured to accumulate when two opposed electrodes are relatively driven in the closing direction. In gas circuit breakers,
A ring-shaped piston provided at an end portion of the opposed energizing electrode, and a shock absorber including a ring-shaped cylinder into which the piston can be inserted,
The ring-shaped cylinder is fixed to a current-carrying support that slides and supports the opposed current-carrying electrode,
Filling the closed space formed between the piston and the cylinder with the arc-extinguishing gas,
A gas circuit breaker, wherein the shock absorber is configured to compress the arc-extinguishing gas by moving the piston in the cylinder to generate a shock absorbing force. A movable electrode and a counter arc electrode which can be freely contacted and separated are arranged in a container sealed with the arc-extinguishing gas, and the movable electrode and a pressure chamber for storing the arc-extinguishing gas pressurized during driving. Is attached to one end of an operating rod, an insulating nozzle is fixed to the pressure chamber, and pressurized gas in the pressure chamber is ejected from the insulating nozzle as a high-speed gas flow to blow an arc generated between the two opposed electrodes. Along with being constituted so as to extinguish and extinguish the arc, a compression spring for driving the opposing arc electrode and the opposing energizing electrode fixed to the opposing arc electrode relatively in a separating direction is coaxially arranged, and the opposing arc electrode is One end of a first link is connected, one end of a second link is connected to a support point provided in the container, and the other ends of the first and second links are rotatably connected to each other. For the operating axis of the arc electrode A cam that moves to a row and is driven by one end of the nozzle being in contact with the tip of the insulating nozzle; a roller is provided at a connection point between the first link and the second link; By sliding, the opposed arc electrode is displaced in the direction opposite to the movable electrode, and the compression spring is configured to accumulate when two opposed electrodes are relatively driven in the closing direction. In gas circuit breakers,
A ring-shaped piston provided at an end portion of the opposed energizing electrode, and a shock absorber including a ring-shaped cylinder into which the piston can be inserted,
The ring-shaped cylinder is fixed to a current-carrying support that slides and supports the opposed current-carrying electrode,
An elastic member is housed in a closed space formed between the piston and the cylinder,
A gas circuit breaker, wherein the shock absorber is configured to generate a shock by compressing the elastic member by moving the piston in the cylinder. The gas circuit breaker according to claim 4, wherein the piston is disposed so as to be able to be separated from and connected to one end of the opposite energizing electrode.

Images