JP2015065005A - Gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas circuit breaker capable of smoothly cooling and exhausting an arc-extinguishing gas with a simple structure and capable of satisfying superior current shut-off performance with a small drive force and a compact size.SOLUTION: The gas circuit breaker includes a movable contactor 20 and an opposite contactor 10 which are adapted to come into contact with each other or separate away from each other when the power is turned ON or shut OFF, and generate an arc discharge in an opening process. The movable contactor 20 or the opposite contactor 10 includes: a mechanical puffer chamber 31 that puffs an accumulated arc-extinguishing gas to an arc discharge; and an exhaust flow pass for exhausting the arc-extinguishing gas. The exhaust flow pass has an acceleration taper 30 in a segment in which the flow pass expands from the exhaustion upper stream toward the exhaustion lower stream.

Description

  Embodiments of the present invention relate to a gas circuit breaker that switches between current interruption and input in a power system.

  In an electric power system, a gas circuit breaker is used when it is necessary to interrupt an excessive accident current, a small advance current, a delayed load current such as a reactor cutoff, or an extremely small accident current. The gas circuit breaker mechanically disconnects the contactor during the disconnection process, and extinguishes the arc discharge generated during the disconnection process by blowing arc-extinguishing gas.

  As the above-described gas circuit breaker, a type called a puffer type is currently widely used (see, for example, Patent Document 1). The puffer-type gas circuit breaker is arranged in an airtight container filled with an arc extinguishing gas, with an opposed arc contact and an opposed energized contact, and a movable arc contact and a movable energized contact, respectively, facing each other. Is brought into contact with or separated from each other by a mechanical driving force by the operating rod, thereby conducting or interrupting the current.

  In this gas circuit breaker, the volume decreases with the separation of the contacts, and the pressure-accumulating space in which the arc-extinguishing gas is accumulated and the arc-contacting properties of the pressure-accumulating space are arranged so as to surround both arc contacts. An insulating nozzle is provided to guide the gas to the arc. The pressure accumulating space is surrounded by the cylinder, the piston, and the operation rod, and the volume is reduced by moving the cylinder closer to the piston in conjunction with the separation of the contact, thereby accumulating the arc-extinguishing gas inside.

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

  In general, the gas pressure of the arc extinguishing gas blown to the arc discharge is an element of the interruption performance, and it can be said that the higher the pressure accumulation capacity of the pressure accumulation space, the higher the interruption performance. In recent years, in addition to mechanical arc extinguishing gas boosting by cylinders and pistons, gas circuit breakers that boost arc extinguishing gas in a pressure accumulating space using thermal energy released by arc discharge have become widespread. (For example, refer to Patent Document 2). This gas circuit breaker with a boosting function by its own effect can improve the current interrupting performance without increasing the driving energy for mechanically compressing the arc extinguishing gas. Has contributed to

  In a gas circuit breaker with a small size and low driving force, it is natural that the movable arc contact, fixed arc contact, insulation nozzle, etc. are compactly configured in order to efficiently use the self-effect. There are many. Further, in order to complete the opening operation against the extremely high gas pressure in the pressure accumulating space, the piston receiving the pressure is often configured in a small size.

  For this reason, the internal space of the operating rod, the internal space of the insulating nozzle, and the internal space of the piston support that supports the piston tend to be small. These internal spaces constitute an exhaust flow path for the blown arc-extinguishing gas. As a result, in the gas circuit breaker that is reduced in size and driven low, the volume of the exhaust passage and the exhaust cross-sectional area are reduced, and high-temperature arc-extinguishing gas cannot be exhausted smoothly, so that excellent cutoff performance is always obtained. It was no longer limited. In particular, when a large current is interrupted, the problem that the interrupting performance expected can not be sufficiently exhibited can be remarkable.

  To solve this problem, provide an open / close valve with a spring attached to the exhaust hole of the operating rod, and change the cross-sectional area of the exhaust hole according to the pressure in the operating rod to achieve rapid discharge of high-temperature gas. (For example, refer to Patent Document 3).

Japanese Examined Patent Publication No. 7-109744 Japanese Examined Patent Publication No. 7-97466 Japanese Patent Laid-Open No. 9-50747

  In a gas circuit breaker that has been downsized and driven low, the volume and cross-sectional area of the exhaust flow path are reduced, and high-temperature arc-extinguishing gas cannot be exhausted smoothly. Not exclusively. A solution to change the cross-sectional area of the exhaust hole by the on-off valve has also been presented, but an increase in the number of parts may lead to a complicated structure, an increase in size, and a high cost.

  Therefore, the gas circuit breaker according to the present embodiment is made to solve the above-described problems, and achieves smooth cooling and exhaust of the arc-extinguishing gas with a simple structure, low driving force, It aims at providing the gas circuit breaker which can make compact and the outstanding electric current interruption performance compatible.

  In order to achieve the above object, a gas circuit breaker for switching between current interruption and injection, wherein the closed container filled with the arc extinguishing gas and the airtight container are arranged opposite to each other, and are turned on and off at the time of injection or interruption. The movable contact portion and the opposed contact portion where the arc discharge is generated in the process of contact or separation, and the separation, and the movable contact portion or the opposed contact portion are provided, and pressure is accumulated with respect to the arc discharge. Gas flow generating means for blowing arc-extinguishing gas and the movable contact portion or the opposed contact portion, or the movable contact portion and the opposed contact portion are formed on the arc discharge by the gas flow generating means. An exhaust passage for exhausting the blown-off arc extinguishing gas and an acceleration taper provided in a partial section of the exhaust passage and expanding the passage from upstream to downstream of the exhaust gas are provided.

It is sectional drawing which shows the whole structure of the gas circuit breaker which concerns on 1st Embodiment, Comprising: It is sectional drawing of the gas circuit breaker which shows an electric current addition state. It is sectional drawing which shows the whole structure of the gas circuit breaker which concerns on 1st Embodiment, Comprising: It is sectional drawing which shows exhaust_gas | exhaustion of the arc-extinguishing gas in the interruption | blocking operation | movement process. It is sectional drawing which shows the whole structure of the gas circuit breaker which concerns on 2nd Embodiment. It is sectional drawing which shows the whole structure of the gas circuit breaker which concerns on 3rd Embodiment. It is sectional drawing which shows the whole structure of the gas circuit breaker which concerns on 4th Embodiment. It is sectional drawing which shows the whole structure of the gas circuit breaker which concerns on 5th Embodiment.

(First embodiment)
Hereinafter, the gas circuit breaker of the first embodiment will be described with reference to FIGS. 1 and 2. The gas circuit breaker contacts and separates the contacts that make up the electric circuit for turning on and off the current and extinguishes arc discharge generated between the contacts during the current interruption process by blowing arc-extinguishing gas. . The gas circuit breaker of the first embodiment is a so-called puffer type, and sprays arc-extinguishing gas on arc discharge by a mechanical compression action. The arc extinguishing gas blown by the arc discharge is exhausted through a flow path provided in the gas circuit breaker. Hereinafter, the side of the contact toward the contact or the arc discharge side is referred to as the front end, and the opposite side is referred to as the rear end.

(Outline configuration)
This gas circuit breaker arranges a contact in a sealed container (not shown) filled with an arc extinguishing gas. The hermetic container is made of metal or insulator and is grounded. The arc extinguishing gas is, for example, sulfur hexafluoride gas (SF ₆ gas), air, carbon dioxide, oxygen, nitrogen, or a mixed gas thereof, or other gas excellent in arc extinguishing performance and insulation performance. Desirably, the arc-extinguishing gas is a single gas or a mixed gas of a gas that has a lower global warming potential than sulfur hexafluoride gas, has a low molecular weight, and is in a gas phase at least 1 atm and 20 degrees centigrade. is there.

  As shown in FIG. 1, a contactor is divided roughly into the opposing contactor part 10 and the movable contactor part 20, and opposes in an airtight container. The opposed contact portion 10 and the movable contact portion 20 are a composite body having a basic shape of an internal hollow cylinder or a solid column, and all the members have a concentric arrangement having a common central axis, By matching the diameters, the related members face each other and function cooperatively.

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

  The movable contact portion 20 is movable along the central axis in the opening direction and the contact direction with respect to the opposing contact portion 10. That is, the movable contact portion 20 includes an operation rod 25 that moves on the central axis by an operation force of a driving device (not shown). The other components of the movable contact portion 20 are linked to the operation rod 25. When the operating rod 25 is pushed into the opposing contact portion 10 side or pulled away from the opposing contact portion 10 side, the movable contact portion 20 contacts and separates from the opposing contact portion 10.

  Around the trunk of the operating rod 25, there is provided a machine puffer chamber 31 having a Baumkuchen shape that provides a mechanical compression action. The volume of the mechanical puffer chamber 31 is variable in conjunction with the movement of the operation rod 25, the volume decreases in the process of interrupting the current, and arc extinguishing gas is released to the outside as the internal space accumulates pressure.

  The mechanical puffer chamber 31 is connected to an insulating nozzle 23 that guides the mechanically compressed arc extinguishing gas to arc discharge. The insulating nozzle 23 surrounds the communication hole 24 a that connects the mechanical puffer chamber 31 and the outside and the movable contact 21 to the tip, thereby surrounding the space where arc discharge is generated and the discharge discharged from the mechanical puffer chamber 31. Guide the arc gas to the arc discharge.

(Detailed configuration)
First, the opposed contact portion 10 has opposed energization contact using a cooling cylinder 9 having a cylindrical shape with openings at both ends and a support 13 erected on the inner wall surface of the cooling cylinder 9 and extending to a common shaft as a support portion. The child 12 and the counter arc contact 11 are fixedly arranged.

  The opposed energizing contact 12 is a cylindrical conductor. The opposed energizing contact 12 has the same diameter as the edge of the cooling cylinder 9 on the movable contact portion 20 side. The opposed energizing contact 12 extends continuously from this edge toward the movable contact portion 20 side. An opening edge of the tip of the opposed energizing contact 12 bulges out.

  The counter arc contact 11 is a cylindrical conductor whose one end is rounded. The counter arc contact 11 is supported by the support 13 at the rear end side, and extends on the rounded side toward the movable contact 20 along the common axis.

  The inner diameter of the cooling cylinder 9 and the inner diameter of the opposed energizing contact 12 are larger than the outer diameter of the opposed arc contact 11, and a balm couchen shape is formed between the opposed arc contact 11, the cooling cylinder 9 and the opposed energized contact 12. The space portion is formed.

  Next, in the movable contact portion 20, the operating rod 25 is a hollow cylinder on one side and a solid cylinder on the other side, and is disposed on the central axis with the hollow portion having an open end facing the facing contact portion 10 side. Has been. The operation rod 25 is the core of the movable contact portion 20, and the rear end of the solid portion side is connected to the drive device via an insulating rod (not shown), and is pushed or pulled in the axial direction.

  A flow guide 25 a is provided at the boundary between the hollow portion and the solid portion of the operation rod 25. In the vicinity of the distal end side of the flow guide 25a, a communication hole 25b that connects the inside and the outside of the operation rod 25 is formed in the side peripheral wall. The flow guide 25 a has a tapered surface that is narrowed toward the distal end side of the operation rod 25. The communication hole 25b is provided behind the later-described piston 27 and at a position facing the inner peripheral surface of the piston support 28.

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

  The opening edge of the movable arc contact 21 bulges inside. The inner diameter of the opening edge portion matches the outer diameter of the counter arc contact 11. The movable arc contact 21 is fixed to the tip of the operation rod 25, and is moved toward and away from the counter arc contact 11 in conjunction with the operation rod 25, and the counter arc contact 11 is inserted into the opening of the movable arc contact 21. As a result, the movable arc contact 21 and the counter arc contact 11 become conductive.

  In addition, the front-end | tip of the movable arc contactor 21 may be formed as a finger-like electrode by dividing | segmenting in the circumferential direction. The movable arc contact 21 has flexibility, and the inner diameter of the opening edge of the movable arc contact 21 is slightly smaller than the outer diameter of the counter arc contact 11.

  The mechanical puffer chamber 31 is a gas flow generating means configured by the cylinder 24, the piston 27, and the operation rod 25. The cylinder 24 is a cylindrical conductor having one end with a bottom and the other end opened. The bottomed portion of the cylinder 24 is flush with the distal end of the operation rod 25 and is connected to the operation rod 25 so as to be connected to the proximal end of the movable arc contact 21 and moves together with the operation rod 25.

  The cylinder 24 has an inner diameter larger than the outer diameter of the operation rod 25 and has a common central axis with the operation rod 25. The bottomed portion has a disk shape, extends from the outer periphery of the tip of the operation rod 25 in a flange shape, and the side peripheral wall surrounding the bottomed portion extends in the opposite direction to the opposed contact portion 10.

  The piston 27 is a donut-shaped flat plate. The operating rod 25 slidably penetrates through the opening of the piston 27, the outer diameter of the piston 27 matches the inner diameter of the cylinder 24, and the piston 27 is fitted into the cylinder 24.

  The piston 27 is formed integrally with the piston support 28. The piston support 28 is a cylinder that extends from the piston 27 in the direction opposite to the facing contact portion 10. Located on the outer side of the operation rod 25, the inner peripheral surface of the piston support 28 faces the outer peripheral surface of the operation rod 25. The piston support 28 is not connected to the operation rod 25 and is fixed in position in the sealed container. On the opposite side of the piston support 28 from the piston 27, a communication hole 28a for exhausting the arc extinguishing gas into the sealed container is provided.

  A space defined by the cylinder 24, the piston 27, and the operation rod 25 is a mechanical puffer chamber 31. The bottom of the cylinder 24 is provided with a communication hole 24a that opens to the outside of the movable arc contact 21 around the movable arc contact 21 so as to connect the mechanical puffer chamber 31 and its outdoor space to the opposing arc contact. Connect on the 11th side.

  The insulating nozzle 23 is an internal hollow cylinder provided upright on the surface of the bottomed portion of the cylinder 24 on the side of the counter arc contact 21. The insulating nozzle 23 surrounds the communication hole 24a with the mechanical puffer chamber 31, and extends along the central axis toward the counter arc contact 11 while wrapping the movable arc contact 21 at a predetermined interval. Further, after passing through the tip of the movable arc contact 21, the insulating nozzle 23 is narrowed to an extent where the inner diameter is slightly larger than the outer diameter of the opposed arc contact 11, and reaches the throat portion that becomes the minimum inner diameter portion. It is a shape that expands linearly toward.

  The movable energizing contact 22 is a conductor having a cylindrical shape with an open end face. The movable energizing contact 22 has a cylindrical wall further outside the insulating nozzle 23, and is erected on the bottomed portion of the cylinder 24 toward the opposing energizing contact 12. The movable energizing contact 22 faces the counter energizing contact 12. The outer diameter of the movable energizing contact 22 matches the inner diameter of the opening edge portion that bulges inside the opposing energizing contact 12. When the movable energizing contact 22 is inserted into the opening of the opposed energizing contact 12, the inner surface of the opposed energizing contact 12 and the outer surface of the movable energizing contact 22 are brought into contact with each other and become electrically conductive.

(Flow path configuration)
The exhaust flow path of the arc extinguishing gas is divided into two directions, that is, the facing contact portion 10 side and the movable contact portion 20 side, and an acceleration taper 30 is provided in a partial section thereof. The acceleration taper 30 is a flow path section in which the flow path linearly expands toward the downstream side, and accelerates the flow of the arc extinguishing gas.

  The exhaust channel on the side of the counter contact 10 is a first counter channel 41 surrounded by the outer peripheral surface of the counter arc contact 11 and the inner peripheral surface of the counter energizing contact 12, and the outer periphery of the counter arc contact 11. The second opposing side flow path 42 surrounded by the surface and the inner peripheral surface of the cooling cylinder 9 and the third opposing side flow path 43 which is the latter half internal space of the cooling cylinder 9 are configured to be continuous. The first opposing channel 41 is on the exhaust upstream side, and the third opposing channel 43 is on the exhaust downstream side.

  The exhaust flow path on the movable contact portion 20 side includes a first movable side flow path 51 inside the movable arc contact 21, a second movable side flow path 52 inside the operation rod 25, and a piston support 28. A third movable-side channel 53 surrounded by the inner peripheral surface and the outer peripheral surface of the operation rod 25 is configured to be continuous. The first movable channel 51 is on the exhaust upstream side, and the third movable channel 53 is on the exhaust downstream side.

  The side peripheral wall forming the movable arc contact 21 is made thinner toward the operation rod 25. However, the outer diameter of the movable arc contactor 21 is the same in each part in the extending direction. On the other hand, the inner diameter of the movable arc contact 21 is linearly increased toward the operation rod 25. That is, in the first embodiment, the acceleration taper 30 is provided on the inner peripheral surface of the movable arc contact 21, and the first movable side flow path 51 is expanded toward the exhaust downstream side. .

(Function)
(Blocking operation)
In the energized state, as shown in FIG. 1, the cooling cylinder 9, the opposed energizing contact 12, the movable energizing contact 21, and the cylinder 24 are electrically connected to form an electric circuit. Although not particularly illustrated, two conductors are fixed to the opposed contact portion 10 side and the movable contact portion 20 side by spacers in the sealed container. The spacer insulates the sealed container from the conductor and supports the conductor. In the energized state, current flows into the gas circuit breaker via a bushing (not shown), and from the conductor on the opposing contact portion 10 side through the conductor and the bush on the movable contact portion 20 side and the bushing (not shown). Flows out of the gas circuit breaker.

  When receiving an interruption signal from the outside and interrupting an accident current or the like, the gas circuit breaker opens the opposing contact portion 10 and the movable contact portion 20 to interrupt the current as shown in FIG. Specifically, the operating rod 25 receives the operating force of the driving device and moves along the central axis in the direction opposite to the facing contact portion 10. The movable contact portion 20 is dragged by the operation rod 25 and moves away from the opposed contact portion 10, and the opposed energized contact 12 and the movable energized contact 22 are separated.

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

  When the interruption operation further proceeds and the movable arc contact 21 is separated from the opposed arc contact 11, an arc discharge is generated between the opposed arc contact 11 and the movable arc contact 21. When the interruption operation further proceeds, the distance between the opposed arc contact 11 and the movable arc contact 21 is sufficiently opened and the mechanical puffer chamber 31 is sufficiently accumulated, the arc extinguishing gas in the mechanical puffer chamber 31 passes through the communication hole 24a. It passes through and is ejected into the insulating nozzle 23.

  The arc extinguishing gas that has become a jet is guided toward the arc discharge using the gas flow path between the insulating nozzle 23 and the movable arc contact 21 and is strongly blown to the arc discharge. The arc discharge is extinguished in combination with the blowing of a strong arc extinguishing gas when the current zero point is reached. Thereby, the current interruption of the gas circuit breaker is completed.

(Exhaust arc extinguishing gas)
In the process of the current interruption operation, the arc extinguishing gas blown to the arc discharge is separately discharged to the movable contact portion 20 side and the opposed contact portion 10 side as shown in FIG.

  Specifically, on the counter contact portion 10 side, the arc extinguishing gas is surrounded by the outer peripheral surface of the counter arc contact 11 and the inner peripheral surface of the counter energizing contact 12 from the arc discharge generation space. Enters the opposite channel 41. Next, the second counter-side channel 42 surrounded by the outer peripheral surface of the counter arc contact 11 and the inner peripheral surface of the cooling cylinder 9 is entered from the first counter-side channel 41. Then, the air passes through the third counter-side channel 43 which is the latter half internal space of the cooling cylinder 9 and is exhausted into the sealed container.

  Further, on the movable contact portion 20 side, the arc extinguishing gas enters the first movable flow path 51 which is inside the movable contact 21 from the space where the arc discharge is generated. An acceleration taper 30 is provided inside the movable arc contact 21. That is, the first movable-side flow path 51 is expanded in diameter toward the downstream side. For this reason, the flow rate of the arc extinguishing gas is increased inside the movable contact 21, and the arc extinguishing gas that has been hot until reaching the hollow portion of the operating rod 25 is greatly cooled.

  Next, the arc extinguishing gas whose flow velocity has been increased by the acceleration taper 30 enters the second movable side flow channel 52 inside the operation rod 25 from the first movable side flow channel 51. As the flow velocity is increased by the acceleration taper 30, the pressure inside the operating rod 25 decreases. For this reason, the flow rate of the arc extinguishing gas is maintained high in the vicinity of the movable arc contact 21.

  In the operation rod 25, the arc extinguishing gas is guided by the flow guide 25 a and enters the third movable side channel 53 from the communication hole 25 b. In the third movable channel 53, the arc extinguishing gas is guided to the sealed container by the inner peripheral surface of the piston support 28 and the outer peripheral surface of the operation rod 25, and the exhaust is completed.

(effect)
As described above, the gas circuit breaker according to the present embodiment includes the opposed contact portion 10 and the movable contact portion 20 that are disposed to face each other in the sealed container filled with the arc extinguishing gas. The opposing contact portion 10 and the movable contact portion 20 are brought into contact or separated from each other when being turned on or off, and arc discharge is generated in the process of separation. The movable contact portion 20 is provided with a mechanical puffer chamber 31 as a gas flow generating means for blowing the arc extinguishing gas accumulated against the arc discharge.

  The opposed contact portion 10 and the movable contact portion 20 are formed with an exhaust passage for exhausting the arc extinguishing gas blown to the mechanical puffer chamber 31 by the arc discharge. An acceleration taper 30 is formed in a partial section of the exhaust flow channel to expand the flow channel from upstream to downstream of the exhaust. In the first embodiment, the acceleration taper 30 is formed in the movable arc contact 21 having a hollow cylindrical shape and the inside thereof forming a section of the exhaust passage.

  Thereby, even if it is a small-sized gas circuit breaker corresponding to a low driving force composed of a compact movable arc contact 21, a counter arc contact 11, an insulating nozzle 23, and a piston 27, the arc-extinguishing gas smoothly Exhaust and cooling can be realized, and current interruption performance with respect to size and driving force can be improved. Of course, even a gas circuit breaker that does not pursue compactness can improve current interruption performance with respect to its size and driving force.

(Second Embodiment)
Hereinafter, the gas circuit breaker of the second embodiment will be described with reference to FIG. The same configurations and the same functions as those of the gas circuit breaker according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, the gas circuit breaker according to the second embodiment includes first to third counter-side channels 41, 42, 43, and first to third movable-side channels 51, 52, The arc extinguishing gas is exhausted to the sealed container through 53, and the acceleration taper 30 is formed in the second movable side flow path 52, that is, the inside of the operation rod 25.

  The side peripheral wall that forms the operation rod 25 is made thinner toward the communication hole 25b. However, the outer diameter of the operation rod 25 is the same in each part in the extending direction. On the other hand, the inner diameter of the operation rod 25 is linearly increased toward the communication hole 25 b communicating with the inside of the piston support 28.

  Thus, even in the gas circuit breaker according to the second embodiment, smooth discharge and cooling of the arc extinguishing gas can be realized by the presence of the acceleration taper 30, and the current interruption performance with respect to the size and driving force can be achieved. Can be improved.

(Third embodiment)
Hereinafter, the gas circuit breaker of the third embodiment will be described with reference to FIG. The same configurations and the same functions as those of the gas circuit breaker according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the gas circuit breaker according to the third embodiment includes first to third opposed flow paths 41, 42, 43, and first to third movable flow paths 51, 52, The arc extinguishing gas is exhausted to the sealed container through 53, and the acceleration taper 30 is formed in the third movable side flow path 53, that is, inside the piston support 28.

  The side peripheral wall forming the piston support 28 is made thinner toward the communication hole 28a. However, the outer diameter of the piston support 28 is the same in each part in the extending direction. On the other hand, the inner diameter of the piston support 28 is linearly increased toward the communication hole 28 a communicating with the inside of the piston support 28.

  Thus, even in the gas circuit breaker according to the third embodiment, smooth discharge and cooling of the arc extinguishing gas can be realized by the presence of the acceleration taper 30, and the current interruption performance with respect to the size and driving force can be achieved. Can be improved.

(Fourth embodiment)
Hereinafter, the gas circuit breaker of the fourth embodiment will be described with reference to FIG. The same configurations and the same functions as those of the gas circuit breaker according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, the gas circuit breaker according to the fourth embodiment includes first to third opposing-side flow paths 41, 42, 43, and first to third movable-side flow paths 51, 52, The arc extinguishing gas is exhausted to the sealed container through 53, and the acceleration taper 30 is formed in the first opposed flow path 41, that is, the opposed energized contact 12.

  The side peripheral wall forming the opposed energizing contact 12 has a uniform thickness, but linearly expands so that the cross-section becomes trapezoidal from the middle to the contact edge with the cooling cylinder 9. However, a predetermined length from the tip on the movable contact portion 20 side is a cylindrical shape having the same radius. The predetermined length from the tip is a level including the depth at which the movable energizing contact 22 enters in the state where the opposing energizing contact 12 and the movable energizing contact 22 are connected in a current-applied state.

  As described above, in the gas circuit breaker according to the fourth embodiment, the acceleration taper 30 is formed in the exhaust passage on the counter contact portion 10 side due to the presence of the acceleration taper 30, so that the counter contact portion 10 side is provided. Smooth discharge and cooling of the arc extinguishing gas can also be realized in the exhaust flow path, and the current interruption performance with respect to the size and driving force can be improved.

  In addition, in combination with the acceleration taper 30 included in the gas circuit breaker according to the first to third embodiments, smooth discharge of the arc extinguishing gas in both exhaust flow paths of the opposed contact portion 10 and the movable contact portion 20 and Cooling can be realized, and the current interruption performance with respect to the size and driving force can be further improved.

(Fifth embodiment)
Hereinafter, the gas circuit breaker of the fifth embodiment will be described with reference to FIG. The same configurations and the same functions as those of the gas circuit breaker according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, the gas circuit breaker according to the fifth embodiment includes first to third opposed flow paths 41, 42, 43, and first to third movable flow paths 51, 52, The arc extinguishing gas is exhausted to the sealed container through 53, and the acceleration taper 30 is formed in the second opposing flow path 52, that is, the cooling cylinder 9. The side peripheral wall forming the cooling cylinder 9 has a uniform thickness, but is linearly expanded so that a midway section in the length direction has a trapezoidal cross section.

  As described above, in the gas circuit breaker according to the fifth embodiment, the acceleration taper 30 is formed in the exhaust passage on the counter contact portion 10 side due to the presence of the acceleration taper 30, so that the counter contact portion 10 side is provided. Smooth discharge and cooling of the arc extinguishing gas can also be realized in the exhaust flow path, and the current interruption performance with respect to the size and driving force can be improved.

  In addition, in combination with the acceleration taper 30 included in the gas circuit breaker according to the first to third embodiments, smooth discharge of the arc extinguishing gas in both exhaust flow paths of the opposed contact portion 10 and the movable contact portion 20 and Cooling can be realized, and the current interruption performance with respect to the size and driving force can be further improved.

(Other embodiments)
In the present specification, an embodiment according to the present invention has been described. However, this embodiment is presented as an example, and is not intended to limit the scope of the invention. Combinations of all or any of the configurations disclosed in the embodiments are also included. The above embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope of the present invention and the gist thereof, and are also included in the invention described in the claims and the equivalent scope thereof.

  For example, the gas circuit breaker according to this embodiment or the modification is configured to fix the opposed contact portion 10 and move only the movable contact portion 20 in the axial direction. A so-called dual motion mechanism may be employed in which the opposing contact portion 10 is also moved in the axial direction so that the child portion 20 moves relatively, thereby improving the relative opening speed.

  Further, as the gas flow generating means, a heat puffer chamber may be employed instead of the mechanical puffer chamber 31, or a serial puffer type using both the mechanical puffer chamber 31 and the heat puffer chamber may be employed. The thermal puffer chamber is a gas flow generating means for accumulating the arc-extinguishing gas in the room by using the thermal energy of the arc-extinguishing gas that has been heated by arc discharge.

  Various other changes in various configurations are possible. For example, the installation of the flow guide 25a for guiding the gas flow is optional. The opposing energizing contact 12 and the movable energizing contact 22 may have any shape that can be electrically connected. The tip of the opposing energizing contact 12 bulges inside, and the movable energizing contact 22 becomes the opposing energizing contact 12. You may make it plug. Also in the bulging mode, a finger extending toward the common shaft may be attached to the tip of the contact, and the finger may be pressed by a leaf spring. In this case, the other contactor and the finger come into contact with each other, and the finger is pushed and spread against the leaf spring.

  Moreover, the acceleration taper 30 should just be provided in one area of the exhaust_gas | exhaustion flow path of arc-extinguishing gas, and it can achieve smooth exhaust_gas | exhaustion and cooling of arc-extinguishing gas even if it does not specifically limit a place. Regarding the shape of the acceleration taper 30, not only linearly expanding the diameter, but also arranging a throat part, having a plurality of taper angles, curved, or providing a section that does not expand in the middle, etc. Various shapes can be taken.

9 Cooling cylinder 10 Opposing contact part 11 Opposing arc contact 12 Opposing energizing contact 13 Support 20 Movable contact part 21 Movable arc contact 22 Movable energizing contact 23 Insulating nozzle 24 Cylinder 24a Communication hole 25 Operation rod 25a Flow guide 25b Communication hole 27 Piston 28 Piston support 28a Communication hole 30 Acceleration taper 31 Machine puffer chamber 41 First opposed flow path 42 Second opposed flow path 43 Third opposed flow path 51 First movable flow path 52 Second movable side channel 53 Third movable side channel

Claims (6)

A gas circuit breaker that switches between current interruption and input,
A sealed container filled with arc-extinguishing gas;
A movable contact portion and an opposing contact portion, which are disposed opposite to each other in the closed container, contact or separate from each other at the time of charging or shutting off, and arc discharge is generated in the process of separation;
A gas flow generating means that is provided in the movable contact portion or the opposed contact portion and blows the arc extinguishing gas accumulated with respect to the arc discharge;
Exhaust flow for exhausting arc-extinguishing gas formed in the movable contact portion or the opposed contact portion, or the movable contact portion and the opposed contact portion, and blown to the arc discharge by the gas flow generating means Road,
An acceleration taper that is provided in a partial section of the exhaust flow path and expands the flow path from upstream to downstream of the exhaust;
Providing
A gas circuit breaker characterized by The movable contact portion and the opposed contact portion are
The movable arc contact and the counter arc contact that take off the arc discharge and take off the arc at the time of interruption are shared and provided.
The movable arc contact has a hollow shape, forms a section of the exhaust flow path,
The acceleration taper is formed on the movable arc contact;
The gas circuit breaker according to claim 1. The movable contact portion or the opposed contact portion, or the movable contact portion and the opposed contact portion are
Equipped with an operating rod that transmits the driving force for separation,
The operating rod has a hollow shape and forms a section of the exhaust flow path.
The acceleration taper is formed on the operating rod;
The gas circuit breaker according to claim 1. The gas flow generating means is a mechanical puffer chamber;
A cylinder that moves in conjunction with the movable contact portion;
A piston whose position is fixed in the sealed container;
A piston support for fixing the position of the piston in the sealed container;
With
The piston support has a hollow cylindrical shape, and forms a section of the exhaust flow path.
The acceleration taper is formed on the piston support;
The gas circuit breaker according to claim 1. The movable contact portion and the opposed contact portion are
A movable energizing contact and an opposing energizing contact that are connected to and separated from each other in conjunction with turning on and off are shared and provided.
The opposed energizing contact has an internal hollow cylindrical shape, and forms a section of the exhaust flow path,
The acceleration taper is formed on the opposed energizing contact;
The gas circuit breaker according to any one of claims 1 to 4. The movable contact portion and the opposed contact portion are
A movable energizing contact and an opposing energizing contact that are connected to and separated from each other in conjunction with turning on and off are shared and provided.
The opposing contact portion is
A cooling cylinder for fixing the position of the opposed energizing contact in a sealed container;
The cooling cylinder has an internal hollow cylindrical shape, and forms a section of the exhaust flow path.
The acceleration taper is formed in the cooling cylinder;
The gas circuit breaker according to any one of claims 1 to 4.

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