JP2016018702A - Gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas circuit breaker capable of preventing hot gas from flowing out to the outer side in the radial direction from a gap between a fixed contact and an insulation nozzle member.SOLUTION: In a gas circuit breaker 1, a fixed-side support member 50 extends in the circumferential direction on the outer side in the radial direction of a fixed arc contact 15. The fixed-side support member 50 is also connected to a fixed main contact 10 and extends to the closed side in the axial direction. In an insulation nozzle member 30, arc generated between the fixed arc contact 15 and a movable arc contact 25 passes through a nozzle passage 35 while the insulation nozzle member 30 moves to the open side in the axial direction from a closed position to a completely open position. At the same time, the nozzle passage 35 is provided with compressed inactive gas from a puffer mechanism 28. In the gas circuit breaker 1, a tip 33, which is an end on the closed side in the axial direction of the insulation nozzle member 30, is configured such that it faces, in the radial direction, a main contact-side end 55, which is an end on the fixed main contact 10 side of the fixed-side support member 50, at the completely open position.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a gas circuit breaker in which an electric current is interrupted in an inert gas.

  A power system such as a power transmission system and a power distribution system is usually provided with an opening / closing device that protects the power system and power equipment by opening and closing an electric circuit. In such a switchgear, in addition to changing the circuit configuration of the electric power system, even when an abnormality occurs in the electric power system, the electric circuit is opened and closed so that the current flowing through the circuit can be interrupted There is a vessel. As a high-voltage AC circuit breaker, there is a so-called “gas circuit breaker” in which contacts (contacts) constituting an electric circuit are opened and closed in an inert gas such as sulfur hexafluoride.

  A gas circuit breaker usually has a sealed container that accommodates a contact, and the inside of the container is filled with an inert gas to cut off an electric current (hereinafter referred to as an extinguishing chamber). Are described). In the extinguishing chamber, generally, a fixed contact fixed to the container and a movable contact configured to be movable in the axial direction with respect to the fixed contact are arranged. In such a gas circuit breaker, in order to change the electric circuit from a closed state to an open state, the movable contact is moved from the closed position to the fully opened position so as to be separated from the fixed contact, and the fixed contact and the movable contact are moved. An operation for interrupting a current flowing between the child and a so-called interrupting operation is performed.

  When such a shut-off operation is performed, an electric arc, that is, arc discharge (hereinafter simply referred to as “arc”) may occur between the stationary contact and the movable contact in the extinguishing chamber. In the gas circuit breaker, the extinguishing chamber is filled with an inert gas, and the movable contact is separated from the fixed contact in the atmosphere of the inert gas. By blowing an inert gas in the extinguishing chamber onto the arc generated between the fixed contact and the movable contact, the arc can be extinguished quickly.

  The gas circuit breaker compresses the inert gas in the extinguishing chamber as the movable contact moves away from the fixed contact, and also compresses the inert gas between the fixed contact and the movable contact. Some have a mechanism for supplying an arc generated between them. Further, the gas circuit breaker is made of an electrical insulator and has a nozzle passage through which an inert gas can flow inward in the radial direction so as to be separated from the fixed contact when current is interrupted. A member that moves in the axial direction together with the movable contact so that when the current is cut off, the arc passes through the nozzle passage, and the nozzle passage receives supply of the inert gas compressed from the puffer mechanism (so-called insulating nozzle member) (For example, refer to Patent Document 1).

JP 2012-182139 A

  In the gas circuit breaker as described above, in recent years, it has been required to reduce the driving force of the movable contact, and by using the energy of the arc generated between the fixed contact and the movable contact, There is a demand to pressurize the inert gas in the isolated room and supply the compressed inert gas upstream toward the arc. In addition, in order to reduce the weight and size of the gas circuit breaker, it is required to reduce the radial dimension of the container and the extinguishing chamber formed in the container. In order to realize this, it is necessary to reduce the size in the radial direction of components arranged in the extinguishing chamber, for example, components such as a stationary contact, a movable contact, and an insulating nozzle member.

  When the radial dimension of the insulating nozzle member or the like is configured to be relatively small, the pressure rise of the inert gas (hereinafter referred to as hot gas) heated by the arc generated between the fixed contact and the movable contact is further increased. It becomes abrupt and the hot gas may not be smoothly discharged in the axial direction, and the hot gas may flow radially outward from the gap between the stationary contact and the insulating nozzle member. When the fixed contact or the movable contact is excessively exposed to a high-temperature hot gas, problems such as a decrease in dielectric strength occur. For this reason, the hot gas generated on the radially inner side of the insulating nozzle member is prevented from flowing out from the gap between the fixed contact and the insulating nozzle member to the radially outer side. There is a need for technology to discharge.

  Embodiments of the present invention have been made in view of the above circumstances, and provide a gas circuit breaker capable of suppressing hot gas from flowing out radially outward from a gap between a stationary contact and an insulating nozzle member. For the purpose.

  In order to achieve the above-described object, a gas circuit breaker according to an embodiment of the present invention includes a container having an extinguishing chamber, which is a space filled with an inert gas and where current is cut off, and the container. A fixed arc contact that is fixed and extends in the axial direction, and is fixed to the container, is provided coaxially with the fixed arc contact, and has a radially outer side of the fixed arc contact. A stationary main contact extending in the circumferential direction, and disposed in the extinguishing chamber so as to be movable in the axial direction. When a current flows in a closed position in contact with the stationary main contact, the current is interrupted. A movable main contact that moves in the axial direction to the fully open position so as to be separated from the fixed main contact, and the extinguishing chamber that moves in the axial direction together with the movable main contact, the fixed Shaft away from arc contact A movable arc contact capable of generating an arc between the fixed arc contact and the fixed main contact extending in a circumferential direction radially outward of the fixed arc contact A fixed-side support member connected to the child and extending toward the axially closing side, and an electric insulator, and the fixed-side support member, the fixed main contact, and the diameter of the movable main contact It has a substantially cylindrical shape extending in the axial direction on the radially inner side of the movable arc contact and the fixed arc contact, and having a nozzle passage through which an inert gas can flow therethrough on the radially inner side. An insulating nozzle member that moves to the axially open side together with the movable main contactor and the movable arc contactor, and an inert gas as the insulating nozzle member moves from the closed position to the fully open position to the axially open side. Compress And a puffer mechanism for supplying the compressed inert gas to the nozzle passage, wherein the insulating nozzle member is fixed during the blocking operation of moving from the closed position to the fully opened position in the axial opening side. An arc generated between an arc contact and the movable arc contact passes through the nozzle passage, and the nozzle passage receives supply of an inert gas compressed from the puffer mechanism, and the insulating nozzle member The tip end portion which is the end portion on the axial direction closing side of the main contactor side end portion which is the end portion on the fixed main contact side of the fixed side support member is radially opposed in the fully open position. It is comprised so that it may carry out.

It is a longitudinal cross-sectional view which shows the structure of the gas circuit breaker of 1st Embodiment. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 1st Embodiment, and has shown the aspect which has an insulation nozzle member in a closed position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 1st Embodiment, (a) is an insulation nozzle member in an open position (middle of the interruption process), The aspect which the arc has produced between the fixed arc contact and the movable arc contact is shown, (b) has shown the aspect which an insulation nozzle member etc. exists in a full open position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 2nd Embodiment, and has shown the aspect which has an insulation nozzle member in a closed position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 2nd Embodiment, (a) is an insulation nozzle member in an open position (middle of the interruption process), The aspect which the arc has produced between the fixed arc contact and the movable arc contact is shown, (b) has shown the aspect which an insulation nozzle member etc. exists in a full open position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 3rd Embodiment, and has shown the aspect which has an insulation nozzle member in a closed position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 3rd Embodiment, (a) is an insulation nozzle member in an open position (middle of the interruption process), The aspect which the arc has produced between the fixed arc contact and the movable arc contact is shown, (b) has shown the aspect which an insulation nozzle member etc. exists in a full open position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 4th Embodiment, and has shown the aspect which has an insulation nozzle member in a closed position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 4th Embodiment, (a) is an insulation nozzle member in an open position (middle of the interruption process), The aspect which the arc has produced between the fixed arc contact and the movable arc contact is shown, (b) has shown the aspect which an insulation nozzle member etc. exists in a full open position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 5th Embodiment, and has shown the aspect which has an insulation nozzle member in a closed position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 5th Embodiment, (a) is an insulation nozzle member in an open position (middle of the interruption process), The aspect which the arc has produced between the fixed arc contact and the movable arc contact is shown, (b) has shown the aspect which an insulation nozzle member etc. exists in a full open position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 6th Embodiment, and has shown the aspect which has an insulation nozzle member in a closed position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of 6th Embodiment, (a) is an insulation nozzle member in an open position (middle of the interruption process), The aspect which the arc has produced between the fixed arc contact and the movable arc contact is shown, (b) has shown the aspect which an insulation nozzle member etc. exists in a full open position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers 1 of other embodiment, and has shown the aspect which has an insulation nozzle member in a closed position. It is a longitudinal cross-sectional view which shows the periphery structure of an insulation nozzle member and a stationary-side support member among the gas circuit breakers of other embodiment, (a) is an insulation nozzle member in an open position (in the middle of interruption | blocking process), and is fixed An aspect in which an arc is generated between the arc contact and the movable arc contact is shown, and (b) shows an aspect in which the insulating nozzle member and the like are in the fully open position.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments described below, and various modifications can be made without departing from the scope of the invention.

[First Embodiment]
A schematic configuration of the gas circuit breaker of the present embodiment will be described with reference to FIG. FIG. 1 is a longitudinal sectional view showing the configuration of the gas circuit breaker of the present embodiment.

(Outline configuration)
As shown in FIG. 1, the gas circuit breaker 1 of this embodiment has the container 3 which accommodates components, such as a contactor which comprises the electric circuit of an electric power system. The container 3 is made of a metal such as cast iron or aluminum alloy. The container 3 accommodates the contacts 10, 15, 20, and 25, and a space 5 (hereinafter referred to as an extinguisher chamber) 5 in which current is interrupted is formed inside.

  The extinguishing chamber 5 is filled with an inert gas having a relatively high electrical insulation, so-called insulating gas. In the present embodiment, for example, sulfur hexafluoride is used as the inert gas (so-called insulating gas) filled in the extinguishing chamber 5. The container 3 accommodates a contact or the like in the extinguishing chamber 5 and is filled with an inert gas and sealed. In addition, the container 3 is electrically grounded and is configured as a so-called “ground tank”.

  In the extinguishing chamber 5, fixed contacts 10 and 15 fixed to the container 3 as contacts constituting an electric circuit of the power system, and movable with respect to the fixed contacts 10 and 15. The configured movable contacts 20 and 25 are arranged. More specifically, the fixed main contact 10 and the movable main contact 20 are arranged as “main contacts” through which current flows when the electric circuit (main circuit) is closed.

  In addition, the arc-extinguishing chamber 5 is accompanied by a shut-off operation in order to prevent arcs from being generated in the main contacts 10 and 20 when the shut-off operation for shutting off the current flowing through the electric circuit (main circuit) is performed. A fixed arc contact 15 and a movable arc contact 25 are arranged as “arc contacts” for attracting the generated arc.

  The fixed arc contact 15 has a substantially rod shape and extends in the axial direction. The axis of the fixed arc contact 15 is indicated by a one-dot chain line A. The fixed main contact 10 is provided coaxially with the fixed arc contact 15, and extends in the circumferential direction so as to surround the radially outer side of the fixed arc contact 15. In the present embodiment, the fixed main contact 10 has an annular shape with the fixed arc contact 15 as an axis.

  In each figure, the axis of the fixed arc contact 15 is indicated by a one-dot chain line A, and the direction along which the movable contacts 20 and 25 move is referred to as the “axis direction” below. . In addition, the direction in which the movable contacts 20, 25 move in the blocking operation, that is, the direction in which the movable contacts 20, 25 are separated from the fixed contacts 10, 15 is hereinafter referred to as “axially open side” in the drawing. Shown by arrow A1. On the other hand, the direction opposite to the axially open side in the axial direction is hereinafter referred to as “axially closed side” and is indicated by an arrow A2 in the figure. The radial direction of the fixed arc contact 15 is simply referred to as “radial direction”, and the circumferential direction of the fixed arc contact 15 is simply referred to as “circumferential direction”. The fixed arc contact 15 is provided coaxially with an exhaust pipe 40 described later, and extends radially inward in the axial direction.

  The movable arc contact 25 is provided coaxially with the fixed arc contact 15 and has an annular shape. The movable arc contact 25 extends in the axial direction and is coupled with an operation member (not shown) for operating the movable contacts 20 and 25. The movable arc contact 25 is configured to be movable in the axial direction with respect to the fixed arc contact 15. When the movable arc contact 25 is operated by the operation member and moves to the axially closed side, the fixed arc contact 15 is inserted and brought into contact with the movable arc contact 25 in the radial direction.

  The movable main contact 20 is provided coaxially with the movable arc contact 25 and has an annular shape. The movable main contact 20 is configured to surround the movable arc contact 25 and the radially outer side of an insulating nozzle member 30 described later. The movable main contact 20 and the movable arc contact 25 are configured to move integrally in the axial direction. The movable main contact 20 comes into contact with the fixed main contact 10 when moved to the axially closed side as indicated by an arrow A2 in the figure. As a result, the electric circuit (main circuit) including the movable main contact 20 and the fixed main contact 10 is closed, and a desired current can flow through the main circuit.

  On the other hand, during the shut-off operation, as shown by an arrow A1 in the figure, the movable contacts 20 and 25 move to the axially open side so as to be separated from the fixed contacts 10 and 15, respectively. After the movable main contact 20 is separated from the fixed main contact 10, when the movable arc contact 25 moves to the axially open side so as to be separated from the fixed arc contact 15, the movable arc contact 25 contacts the fixed arc contact 25. An arc is generated between the child 15. When the arc disappears, the current flowing between the stationary contacts 10 and 15 and the movable contacts 20 and 25 is completely interrupted.

  In the following description, the movable main contact 20 is the fixed main contact 10 among the positions where the movable contacts 20 and 25 and the members coupled to the movable contacts 20 and 25 can be taken in the axial direction. A predetermined position where the movable arc contact 25 is in contact with the fixed arc contact 15 and a desired current flows through the main circuit formed by the movable arc contact 25 is referred to as a “closed position”. That is, the closed position is a position where the main circuit is in a closed state.

  On the other hand, the position where the movable main contact 20 and the fixed main contact 10 are not in contact with each other and no current flows through the main circuit is referred to as an “open position”. That is, the open position is a position where the main circuit is in an open state. FIG. 1 shows a state in which the movable contacts 20 and 25 and the members coupled to the movable contacts 20 and 25 are located at the open position. In the open position, the movable contacts 20 and 25 are moved as far as possible in the axial direction, and the current is completely cut off between the fixed contacts 10 and 15 and the movable contacts 20 and 25. The position to be applied is particularly referred to as a “fully open position”. That is, the interruption operation is an operation from the closed position to the fully open position.

  Further, the gas circuit breaker 1 is provided with a member (hereinafter referred to as an operation rod) 27 that extends from the movable arc contact 25 to the axially open side and operates the movable arc contact 25. The operation rod 27 includes a substantially cylindrical portion (hereinafter referred to as a hollow portion) 27a on the axially closed side and a substantially cylindrical portion (hereinafter referred to as a solid portion) on the axially open side. 27c. The movable arc contact 25 is coupled to the axially closing side of the hollow portion 27a. The operating rod 27 is driven by an operating mechanism (not shown) and moves in the axial direction together with the movable arc contactor 25.

  Note that the axially open side of the solid portion 27 c is coupled to the electrical insulator 7, and the operation rod 27 is driven by the operation mechanism (not shown) together with the electrical insulator 7. On the other hand, on the axially open side of the hollow portion 27a, a through hole (hereinafter referred to as an exhaust hole) 27e that connects the space inside the hollow portion 27a in the radial direction and the space outside in the radial direction is formed. Has been. In the shut-off operation, the exhaust hole 27e discharges a high-temperature inert gas (so-called hot gas) that flows radially inward of the hollow portion 27a toward the axially open side to the radially outer side of the hollow portion 27a.

  A member (hereinafter referred to as an operation rod support member) 21 that supports the operation rod 27 so as to be movable in the axial direction is provided outside the operation rod 27 in the radial direction. The operation rod support member 21 has a substantially cylindrical shape and is provided coaxially with the operation rod 27. Note that the axially open side of the operation rod support member 21 is coupled to the container 3 via the electrical insulator 8.

  On the other hand, of the operation rod support member 21, an end portion on the axial direction closing side (hereinafter referred to as a closing side end portion) 21a is formed of a conductor, and a conductor (hereinafter referred to as a main circuit) constituting an electric circuit (main circuit). (Denoted as main circuit conductor) 24.

  Further, the operating rod support member 21 has a through hole (hereinafter referred to as an exhaust hole) 21e that communicates a space inside the radial direction, that is, a space between the operating rod 27 and a space outside the radial direction. Is formed. The exhaust hole 21 e discharges high-temperature inert gas (hot gas) discharged radially outward from the exhaust hole 27 e of the operating rod 27 to the radially outer side of the operating rod support member 21 in the blocking operation.

  Further, in the extinguishing chamber 5 of the gas circuit breaker 1, a member (hereinafter referred to as an insulating nozzle) that blows an insulating gas against an arc generated between the movable arc contact 25 and the fixed arc contact 15 during the interruption operation. 30) (denoted as a member). The insulating nozzle member 30 is made of an electrical insulator. The insulating nozzle member 30 is provided coaxially with the fixed contacts 10 and 15 and the movable contacts 20 and 25 and extends in the axial direction in a substantially cylindrical shape.

  A passage (hereinafter referred to as a nozzle passage) 35 for passing an arc generated between the fixed arc contact 15 and the movable arc contact 25 and allowing an inert gas to flow through the radially inner side of the insulating nozzle member 30. Is formed. An arc passing through the nozzle passage 35 is generated between the fixed arc contact 15 and the movable arc contact 25 in accordance with the interruption operation. In the shut-off operation, the nozzle passage 35 is supplied with an inert gas from a puffer chamber described later. The detailed configuration of the insulating nozzle member 30 and the nozzle passage 35 of this embodiment will be described later.

  In addition, the gas circuit breaker 1 includes a mechanism (hereinafter referred to as a puffer mechanism) 28 that supplies a compressed inert gas to the nozzle passage 35 of the insulating nozzle member 30 during the interruption operation. The puffer mechanism 28 has a substantially cylindrical member (hereinafter referred to as a cylinder member) 29 that is provided at a predetermined interval radially outward from the operation rod 27.

  The movable main contact 20 and the insulating nozzle member 30 are coupled to an end portion (hereinafter referred to as a closed end portion) 29a on the axially closing side of the cylinder member 29. The movable main contact 20 is coupled to the radially outer side of the insulating nozzle member 30. The cylinder member 29 is coupled to the operation rod 27 and is driven by the operation rod 27 to move in the axial direction together with the movable main contact 20 and the insulating nozzle member 30.

  The cylinder member 29 extends in the axial direction on the outside of the closing side end portion 21a of the operation rod support member 21 described above. A space (hereinafter referred to as a puffer chamber) 34 communicating with the nozzle passage 35 is formed on the radially inner side of the cylinder member 29 and on the radially outer side of the hollow portion 27 a of the operating rod 27. The puffer chamber 34 is a space sandwiched between the closing side end portion 29 a of the cylinder member 29 and the closing side end portion 21 a of the operation rod support member 21 in the axial direction. That is, the puffer chamber 34 is defined by the cylinder member 29 and the operation rod 27 in the radial direction, and is defined by the cylinder member 29 and the operation rod support member 21 in the axial direction.

  In the blocking operation, the cylinder member 29 moves together with the movable contacts 20 and 25, the operation rod 27, and the insulating nozzle member 30 to the axially open side. On the other hand, the operation rod support member 21 is fixed to the container 3. In the shut-off operation, as the cylinder member 29 moves to the axially open side together with the movable contacts 20 and 25, the volume of the puffer chamber 34 decreases, and the inert gas in the puffer chamber 34 is compressed. The compressed inert gas flows from the puffer chamber 34 into the radially inner side of the insulating nozzle member 30 and is supplied to the nozzle passage 35. As a result, an inert gas flow is formed in the nozzle passage 35 along with the blocking operation.

  The arc generated between the fixed arc contact 15 and the movable arc contact 25 in accordance with the interruption operation and passing through the nozzle passage 35 is cooled and extinguished by the flow of the inert gas in the nozzle passage 35. Due to the extinction of the arc, the current flowing between the fixed arc contact 15 and the movable arc contact 25 is completely cut off. The inert gas flowing through the nozzle passage 35 is heated by the arc and becomes a high-temperature inert gas (hereinafter referred to as hot gas).

  In order to cool the hot gas away from the arc contacts 15 and 25, the extinguishing chamber 5 has a substantially cylindrical shape whose axial center extends in the axial direction, and the hot gas flows through the inside thereof. A metal member 40 (hereinafter referred to as an exhaust pipe) 40 is disposed. The exhaust tube 40 is provided coaxially with the fixed arc contact 15 and is provided so as to surround the radially outer side of the fixed arc contact 15. The fixed arc contact 15 is coupled to the exhaust tube 40 via a conductor 17 (hereinafter referred to as a radial conductor) 17 extending in the radial direction. The exhaust tube 40 cools while guiding the hot gas flowing radially inward to the axially closed side.

  In addition, a member (hereinafter referred to as a fixed-side support member) 50 that supports the fixed main contact 10 with respect to the exhaust tube 40 is coupled to the exhaust tube 40 on the axially open side. The fixed-side support member 50 has a substantially cylindrical shape whose axial center extends in the axial direction. The fixed-side support member 50 is provided coaxially with the fixed contacts 10 and 15, the movable contacts 20 and 25, the insulating nozzle member 30, and the like. The fixed-side support member 50 extends from the exhaust tube 40 toward the axially open side, and is connected to the fixed main contact 10.

  In the present embodiment, the fixed side support member 50 is made of a metal including aluminum. On the other hand, the fixed main contact 10 is made of copper, and the fixed arc contact 15 is made of a metal containing copper and tungsten. The fixed main contact 10 is electrically connected to the main circuit conductor 14 via the fixed support member 50 and the exhaust tube 40. The fixed arc contact 15 is electrically connected to the main circuit conductor 14 via the radial conductor 17 and the exhaust tube 40. A detailed configuration of the fixed-side support member 50 will be described later.

  Next, detailed configurations of the insulating nozzle member and the stationary support member of the gas circuit breaker according to the first embodiment will be described with reference to FIGS. FIG. 2 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker according to the present embodiment, and shows an aspect in which the insulating nozzle member is in the closed position. FIG. 3 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker according to the present embodiment. FIG. 3A shows the insulating nozzle member in the open position (in the middle of the shut-off process). There is shown a mode in which an arc is generated between the fixed arc contact and the movable arc contact, and (b) shows a mode in which the insulating nozzle member and the like are in a fully open position.

  As shown in FIG. 2, the insulating nozzle member 30 of the present embodiment is configured such that the diameter (that is, the outer diameter) of the outer peripheral surface 30c that is a radially outer surface is constant regardless of the position in the axial direction. ing. The insulating nozzle member 30 includes an axially open side, that is, an end portion on the movable contact 20, 25 side (hereinafter referred to as a movable contact side end) 31, and an axially closed side, that is, an end on the fixed contact 10, 15 side. Part (hereinafter, referred to as a tip part) 33. In addition, the insulating nozzle member 30 is a portion where the diameter of the nozzle passage 35 increases between the distal end portion 33 and the movable contact side end portion 31 toward the axially closed side (hereinafter referred to as a passage enlarged portion). ) 32.

  The movable contact side end 31 has a substantially cylindrical shape and is provided coaxially with the fixed arc contact 15. The movable contact-side end 31 is disposed at a predetermined interval on the radially outer side of the movable arc contact 25, and is coupled to the radially inner side of the movable main contact 20. The compressed inert gas from the puffer chamber 34 flows into the space between the inner peripheral surface 31a of the movable contact side end 31 and the movable arc contact 25 along with the blocking operation. The movable contact-side end 31 is disposed adjacent to the movable main contact 20 on the radially inner side of the movable main contact 20.

  The passage enlarged portion 32 is provided coaxially with the movable contact side end portion 31. The inner peripheral surface 32a of the passage enlarged portion 32 is located on the radially outer side as it goes toward the axially closing side. That is, a portion of the nozzle passage 35 that is surrounded and defined by the inner peripheral surface 32a is configured such that the cross-sectional area increases toward the axially closing side. The inert gas flowing toward the axially closing side of the nozzle passage 35 decelerates in the space on the radially inner side of the passage enlarged portion 32.

  The distal end portion 33 has a substantially cylindrical shape, and is provided coaxially with the movable contact-side end portion 31 and the passage diameter increasing portion 32. The inner peripheral surface 33a of the distal end portion 33 faces the outer surface of the fixed arc contact 15 and extends in the axial direction with a predetermined distance from the fixed arc contact 15 in the radial direction.

  In the insulating nozzle member 30 including the tip portion 33, the passage diameter-expanding portion 32, and the movable contact-side end portion 31 as described above, the inner peripheral surfaces (31a, 32a, 33a) constituting the radially inner side are the nozzle passages 35. And changes depending on the position in the axial direction as described above.

  The fixed-side support member 50 of the present embodiment includes an axially closed side, that is, an end on the exhaust tube 40 side (hereinafter referred to as an exhaust tube-side end) 51, and an axially open side, that is, an end on the fixed main contact 10 side. Part (hereinafter referred to as a main contact side end) 55. The main contact-side end 55 is a portion of the fixed-side support member 50 that constitutes the radially inner side of the fixed main contact 10. The exhaust tube side end 51 is coupled to the exhaust tube 40 via the radial conductor 17.

  Note that a portion of the fixed-side support member 50 that connects the exhaust tube side end 51 and the main contact side end 55 is simply referred to as a “connecting portion” and denoted by reference numeral 53 in the drawing. In the fixed-side support member 50 of the present embodiment, the connection portion 53 is configured such that the inner surface 53a on the radially inner side is positioned on the radially inner side as it goes toward the axially open side.

  In the gas circuit breaker 1 as described above, when in the closed position shown in FIG. 2, the fixed main contact 10 and the movable main contact 20 are in contact with each other, and the fixed main contact 10 and the movable main contact 20 are in contact with each other. A current flows between them. 2, the fixed arc contact 15 and the movable arc contact 25 are in contact with each other, and an electric current flows between the fixed arc contact 15 and the movable arc contact 25. Yes. When interrupting these currents, the movable main contact 20 and the movable arc contact 25 are moved away from the fixed main contact 10 and the fixed arc contact 15 from the closed position (see FIG. 2) to the fully open position, respectively. A shut-off operation is performed in which the unit moves to the axially open side up to (see FIG. 3B). In the blocking operation, the movable main contact 20 and the movable arc contact 25 move together with the operation rod 27, the cylinder member 29, and the insulating nozzle member 30 to the axially open side.

  As shown in FIG. 2, when in the closed position, the insulating nozzle member 30 is configured such that the distal end portion 33 faces the exhaust tube side end portion 51 of the stationary support member 50 in the radial direction. Further, the passage enlarged diameter portion 32 of the insulating nozzle member 30 is opposed to the connection portion 53 and the main contact side end portion 55 of the stationary support member 50 in the radial direction. At this time, the movable main contact 20 is in contact with the fixed main contact 10, and the movable arc contact 25 is in contact with the fixed arc contact 15. The interruption operation for interrupting the current is started from this closed position.

  Along with the blocking operation, the insulating nozzle member 30 moves to the axially open side together with the movable contacts 20 and 25, the operation rod 27, and the cylinder member 29. During the interruption operation, an arc is generated between the movable arc contact 25 and the fixed arc contact 15 as shown in FIG. Further, the volume of the puffer chamber 34 is reduced with the shut-off operation, and the inert gas is compressed in the puffer chamber 34 and supplied to the nozzle passage 35 on the radially inner side of the insulating nozzle member 30.

  The hot gas generated by the arc passing through the nozzle passage 35 flows between the insulating nozzle member 30 and the fixed arc contact 15 toward the axially closing side and flows into the exhaust tube 40 and into the hollow portion 27a of the operation rod 27. It flows in and flows through the hollow portion 27a toward the axially open side. The hot gas flowing from the nozzle passage 35 into the hollow portion 27a of the operation rod 27 is discharged from the exhaust hole 27e to the outside of the operation rod 27, and further discharged from the exhaust hole 21e to the outside of the operation rod support member 21.

  When the shut-off operation is completed and the insulating nozzle member 30 is in the fully open position shown in FIG. 3B, the distal end portion 33 of the insulating nozzle member 30 is opposed to the main contact side end portion 55 of the stationary support member 50 in the radial direction. Thus, the gas circuit breaker 1 is configured. In the fully open position, a gap is formed between the tip 33 and the inner peripheral surface 55a of the main contact end 55. The gap is a gap necessary for the insulating nozzle member 30 and the fixed-side support member 50 not to contact each other in the blocking operation. The dimension in the radial direction of the gap is set to 2 mm to 3 mm, for example.

  According to the gas circuit breaker 1 of the present embodiment, the hot gas generated in the nozzle passage 35 on the radially inner side of the insulating nozzle member 30 in the fully opened position causes the insulating nozzle member 30 and the fixed-side support member 50 to move. It is possible to suppress outflow from the gap to the outside in the radial direction. The hot gas flowing from the nozzle passage 35 toward the axially closing side can flow more smoothly into the exhaust tube 40.

  As described above, in the gas circuit breaker 1 of the present embodiment, the container 3 has an extinguishing chamber 5 that is a space filled with an inert gas and where current is interrupted. The fixed arc contact 15 is fixed to the container 3 and extends in the axial direction. The fixed main contact 10 is fixed to the container 3, is provided coaxially with the fixed arc contact 15, and extends radially outward of the fixed arc contact 15 in the circumferential direction. The movable main contact 20 is arranged in the extinguishing chamber 5 so as to be movable in the axial direction, and when a current flows at a closed position (see FIG. 2) in contact with the fixed main contact 10, the current is interrupted. To the fully open position (see FIG. 3B) so as to move away from the fixed main contact 10 to the axially open side. The movable arc contact 25 is disposed in the extinguishing chamber 5 so as to be movable in the axial direction together with the movable main contact 20, and is opened in the axial direction so as to be separated from the fixed arc contact 15 when the current is interrupted. By moving to the side, an arc is generated between the fixed arc contact 15.

  In the gas circuit breaker 1 of the present embodiment, the fixed-side support member 50 extends in the circumferential direction on the radially outer side of the fixed arc contact 15, is connected to the fixed main contact 10, and is on the axially closed side. It extends. The insulating nozzle member 30 is made of an electrical insulator, and is radially inward of the fixed-side support member 50, the fixed main contact 10 and the movable main contact 20, and the movable arc contact 25 and the fixed arc contact. 15 has a substantially cylindrical shape extending in the axial direction on the radially outer side and has a nozzle passage 35 through which an inert gas can flow therethrough on the radially inner side, and the movable main contact 20 when the current is interrupted. And the movable arc contact 25 moves to the axially open side. The puffer mechanism 28 compresses the inert gas and supplies the compressed inert gas to the nozzle passage 35 as the insulating nozzle member 30 moves from the closed position to the fully opened position in the axial direction.

  While the insulating nozzle member 30 moves in the axial direction from the closed position to the fully open position, an arc generated between the fixed arc contact 15 and the movable arc contact 25 passes through the nozzle passage 35 and The nozzle passage 35 receives supply of compressed inert gas from the puffer mechanism 28. In the gas circuit breaker 1 of the present embodiment, the distal end portion 33 that is the end portion on the axially closing side of the insulating nozzle member 30 is located on the stationary main contact 10 side of the stationary support member 50 in the fully open position. The main contactor side end portion 55 that is an end portion is configured to face the radial direction. The hot gas generated in the nozzle passage 35 on the radially inner side of the insulating nozzle member 30 can be prevented from flowing out radially between the insulating nozzle member 30 and the fixed-side support member 50.

  In the insulating nozzle member 30 of the present embodiment, the end on the axially closing side of the distal end portion 33 is rounded in the longitudinal section, but the insulating nozzle member according to the present invention is limited to this aspect. Is not to be done. Various shapes can be adopted as the shape of the tip of the insulating nozzle member, and an example thereof will be described below.

[Second Embodiment]
The configuration of the insulating nozzle member and the stationary support member of the gas circuit breaker according to the second embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker according to the present embodiment, and shows an aspect in which the insulating nozzle member is in the closed position. FIG. 5 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker according to the present embodiment. FIG. 5A shows the insulating nozzle member in the open position (in the middle of the shut-off process). There is shown a mode in which an arc is generated between the fixed arc contact and the movable arc contact, and (b) shows a mode in which the insulating nozzle member and the like are in a fully open position. In addition, about the structure substantially common to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 4, in the gas circuit breaker 1C of the present embodiment, the tip portion 33C of the insulating nozzle member 30C protrudes radially outward from the outer peripheral surface 30c of the insulating nozzle member 30C (hereinafter referred to as an outer protrusion). 60) is provided. The outer protruding portion 60 protrudes radially outward as compared with the other portions of the insulating nozzle member 30C, that is, the passage enlarged portion 32 and the movable contact side end portion 31. In the present embodiment, the outer protrusion 60 has an annular shape centered on the axis of the fixed arc contact 15 and extends in the circumferential direction of the insulating nozzle member 30C. When the insulating nozzle member 30C is in the closed position, the outer protruding portion 60 faces the exhaust tube side end portion 51 of the fixed-side support member 50 in the radial direction.

  In the middle of the interruption operation, as shown in FIG. 5A, an arc is generated between the movable arc contact 25 and the fixed arc contact 15 and enters the nozzle passage 35 on the radially inner side of the insulating nozzle member 30C. Produces hot gas. The hot gas flows through the nozzle passage 35 toward the axially closed side and flows into the exhaust tube 40. Further, it flows to the open side in the axial direction and flows into the hollow portion 27 a of the operation rod 27.

  When the shut-off operation is completed and at the fully open position shown in FIG. 5B, the outer protrusion 60 provided at the distal end portion 33 </ b> C of the insulating nozzle member 30 </ b> C is the end on the main contact side of the fixed support member 50. It is configured to face the portion 55. Also in the gas circuit breaker 1 </ b> C configured as described above, the hot gas generated in the nozzle passage 35 located radially inside the insulating nozzle member 30 </ b> C flows out between the insulating nozzle member 30 </ b> C and the fixed-side support member 50. This can be suppressed.

  In the gas circuit breaker 1C of the present embodiment, the outer protrusion 60 of the insulating nozzle member 30C is formed in an annular shape and extends in the circumferential direction. However, the outer protrusion according to the present invention is in this form. It is not limited to. The outer protrusions only need to extend in the circumferential direction. For example, a plurality of outer protrusions extending in the circumferential direction may be arranged in the circumferential direction.

[Third Embodiment]
The configuration of the insulating nozzle member and the stationary support member of the gas circuit breaker according to the third embodiment will be described with reference to FIGS. FIG. 6 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker of the present embodiment, and shows a mode in which the insulating nozzle member is in the closed position. FIG. 7 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker of this embodiment. FIG. 7A shows the insulating nozzle member in the open position (in the middle of the shut-off process). There is shown a mode in which an arc is generated between the fixed arc contact and the movable arc contact, and (b) shows a mode in which the insulating nozzle member and the like are in a fully open position.

  In addition, about the structure substantially common with 1st and 2nd embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 6, in the gas circuit breaker 1E of the present embodiment, the distal end portion 33E of the insulating nozzle member 30E has an outer protruding portion that is a portion protruding radially outward from the outer peripheral surface 30c of the insulating nozzle member 30E. 61 is provided. The outer protrusion 61 has a structure that is substantially the same as that of the outer protrusion 60 (see FIGS. 4 and 5) of the second embodiment, and differs in the distance protruding radially outward from the outer peripheral surface 30c. When the insulating nozzle member 30E is in the closed position, the outer projecting portion 61 faces the exhaust tube side end portion 51 of the fixed-side support member 50E in the radial direction. Note that a surface of the outer protrusion 61 that faces the fixed-side support member 50 </ b> E is hereinafter referred to as an “outer surface” and denoted by reference numeral 61 c.

  In addition, a portion (hereinafter referred to as an inner protruding portion) 57 that protrudes radially inward from the inner peripheral surface 55a is provided at the main contact side end portion 55E of the fixed-side support member 50E. The inner protrusion 57 protrudes radially inward relative to the other parts of the fixed support member 50E, that is, the exhaust side end 51 and the connection part 53. In the present embodiment, the inner projecting portion 57 has an annular shape centered on the axis of the fixed arc contact 15 and extends in the circumferential direction of the insulating nozzle member 30E. When the insulating nozzle member 30E is in the closed position, the inner projecting portion 57 faces the passage enlarged portion 32 of the insulating nozzle member 30E in the radial direction. In addition, the surface which opposes the insulation nozzle member 30E among the inner side protrusion parts 57 is described as an "inner surface" below, and the code | symbol 57a is attached | subjected.

  During the interruption operation, as shown in FIG. 7A, an arc is generated between the movable arc contact 25 and the fixed arc contact 15, and the nozzle passage 35 located radially inside the insulating nozzle member 30E. Produces hot gas. The hot gas flows through the nozzle passage 35 toward the axially closed side and flows into the exhaust tube 40. Further, it flows to the open side in the axial direction and flows into the hollow portion 27 a of the operation rod 27.

  When the shut-off operation is completed and the arm is at the fully open position shown in FIG. 7B, the outer protrusion 61 at the tip 33E of the insulating nozzle member 30E and the main contact side end 55E of the fixed support member 50E. The inner projecting portions 57 located in each other are configured to face each other in the radial direction. In the fully open position, a slight gap is formed between the outer surface 61 c of the outer protrusion 61 and the inner surface 57 a of the inner protrusion 57. Also in the gas circuit breaker 1E configured in this way, the hot gas generated in the nozzle passage 35 located radially inside the insulating nozzle member 30E flows out between the insulating nozzle member 30E and the fixed-side support member 50E. This can be suppressed.

  In the gas circuit breaker 1E of the present embodiment, the inner protrusion 57 of the fixed side support member 50E is annular and extends in the circumferential direction. However, the inner protrusion according to the present invention is It is not limited to the embodiment. The inner protrusions only need to extend in the circumferential direction. For example, a plurality of inner protrusions extending in the circumferential direction may be arranged in the circumferential direction.

  In the gas circuit breaker 1E of the present embodiment, the inner protrusion 57 of the fixed-side support member 50E and the outer protrusion 61 of the insulating nozzle member 30E are opposed to each other in the radial direction in the fully open position. The gas circuit breaker according to the present invention is not limited to this embodiment. For example, the insulating nozzle member 30E may not be provided with an outer protrusion, and the stationary support member 50E may be formed with an inner protrusion that faces the outer peripheral surface 30c of the insulating nozzle member 30E.

[Fourth Embodiment]
The configuration of the insulating nozzle member and the stationary support member of the gas circuit breaker according to the fourth embodiment will be described with reference to FIGS. FIG. 8 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker of the present embodiment, and shows an aspect in which the insulating nozzle member is in the closed position. FIG. 9 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker of the present embodiment. FIG. 9A shows the insulating nozzle member in the open position (in the middle of the shut-off process). There is shown a mode in which an arc is generated between the fixed arc contact and the movable arc contact, and (b) shows a mode in which the insulating nozzle member and the like are in a fully open position. In addition, about the structure substantially common with 1st-3rd embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 8, in the gas circuit breaker 1G according to the present embodiment, the distal end portion 33G of the insulating nozzle member 30G has an outer protruding portion that is a portion protruding radially outward from the outer peripheral surface 30c of the insulating nozzle member 30G. 61G is provided. The outer protrusion 61G of the present embodiment is a groove (indented radially inward from the outer surface 61c and extending in the circumferential direction with respect to the outer protrusion 61 (see FIGS. 6 and 7) of the third embodiment ( (Hereinafter referred to as a circumferential groove) 63 is formed. In the present embodiment, the circumferential groove 63 extends over the entire circumference of the insulating nozzle member 30G and forms an annular shape.

  On the other hand, the main contact-side end portion 55E of the fixed-side support member 50E is provided with an inner protrusion 57 that protrudes radially inward from the inner peripheral surface 55a, as in the third embodiment. The inner protrusion 57 extends in the circumferential direction facing the insulating nozzle member 30G.

  In the middle of the interruption operation, as shown in FIG. 9A, an arc is generated between the movable arc contact 25 and the fixed arc contact 15 and enters the nozzle passage 35 on the radially inner side of the insulating nozzle member 30G. Produces hot gas. The hot gas flows through the nozzle passage 35 toward the axially closed side and flows into the exhaust tube 40. Further, it flows to the open side in the axial direction and flows into the hollow portion 27 a of the operation rod 27.

  When the shut-off operation is completed and in the fully open position shown in FIG. 9B, the outer protrusion 61G and the circumferential groove 63 in the insulating nozzle member 30G and the main contact side end of the fixed side support member 50E. 55E, more specifically, the inner protrusions 57 are configured to face each other in the radial direction. In this fully open position, a slight gap is formed between the outer surface 61c of the outer protrusion 61G and the inner surface 57a of the inner protrusion 57. In the present embodiment, a circumferential groove 63 that is recessed radially inward from the outer surface 61c is formed in the outer protruding portion 61G of the insulating nozzle member 30G.

  For this reason, when the hot gas flows in the gap between the outer surface 61c and the inner surface 57a in the fully open position, the circumferential groove 63 is caused by the rapid expansion and contraction of the flow path in the circumferential groove 63. A vortex-like flow is formed. By generating such a turbulent flow by the circumferential groove 63, the pressure loss of the hot gas flowing in the axial direction between the outer surface 61c of the insulating nozzle member 30G and the inner surface 57a of the fixed-side support member 50E is increased. It is possible to further suppress the hot gas from flowing out between the insulating nozzle member 30G and the stationary support member 50E.

[Fifth Embodiment]
The configuration of the insulating nozzle member and the stationary support member of the gas circuit breaker according to the fifth embodiment will be described with reference to FIGS. 10 and 11. FIG. 10 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker of the present embodiment, and shows a mode in which the insulating nozzle member is in the closed position. FIG. 11 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker according to the present embodiment. FIG. 11A shows the insulating nozzle member in the open position (in the middle of the shut-off process). There is shown a mode in which an arc is generated between the fixed arc contact and the movable arc contact, and (b) shows a mode in which the insulating nozzle member and the like are in a fully open position. In addition, about the structure substantially common with the 1st-4th embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 10, in the gas circuit breaker 1H of the present embodiment, an insulating nozzle member 30E is provided as in the third embodiment. An outer protrusion 61 that protrudes radially outward is provided at the tip 33E of the insulating nozzle member 30E.

  On the other hand, the main contact side end portion 55H of the fixed side support member 50H is provided with an inner protrusion 57H that protrudes radially inward from the inner peripheral surface 55a. The inner protrusion 57H extends over the entire circumference in the circumferential direction.

  The fixed-side support member 50H of the present embodiment is a groove that is recessed radially outward from the inner surface 57a of the inner protrusion 57H of the main contact-side end 55H and that extends in the circumferential direction (hereinafter referred to as a circumferential groove). 59 is formed. In the present embodiment, the circumferential groove 59 extends over the entire circumference of the fixed-side support member 50H and has an annular shape.

  In the middle of the interruption operation, as shown in FIG. 11A, an arc is generated between the movable arc contact 25 and the fixed arc contact 15 and enters the nozzle passage 35 on the radially inner side of the insulating nozzle member 30E. Produces hot gas. The hot gas flows through the nozzle passage 35 toward the axially closed side and flows into the exhaust tube 40. Further, it flows to the open side in the axial direction and flows into the hollow portion 27 a of the operation rod 27.

  When the shut-off operation is completed and the fully open position shown in FIG. 11B is reached, the outer protrusion 61 of the insulating nozzle member 30E and the inner protrusion 55H of the main contact side end 55H of the fixed-side support member 50H. 57H is comprised so that it may mutually oppose in a radial direction. In this fully open position, a slight gap is formed between the outer surface 61c of the outer protrusion 61 and the inner surface 57a of the inner protrusion 57H. In the present embodiment, a circumferential groove 59 that is recessed radially outward from the inner surface 57a is formed in the inner protrusion 57H of the fixed-side support member 50H.

  Therefore, when the hot gas flows in the axial direction in the gap between the outer surface 61c and the inner surface 57a in the fully open position, a vortex flow is formed by the circumferential groove 59 to generate turbulent flow. By generating the turbulent flow by the circumferential groove 59, it is possible to increase the pressure loss of the hot gas flowing in the axial direction between the outer surface 61c of the insulating nozzle member 30E and the inner surface 57a of the fixed-side support member 50H. Also according to this aspect, it is possible to suppress the hot gas from flowing out between the insulating nozzle member 30E and the fixed-side support member 50H.

[Sixth Embodiment]
The configuration of the insulating nozzle member and the stationary support member of the gas circuit breaker according to the sixth embodiment will be described with reference to FIGS. FIG. 12 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker of the present embodiment, and shows a mode in which the insulating nozzle member is in the closed position. FIG. 13 is a longitudinal sectional view showing the peripheral structure of the insulating nozzle member and the stationary support member in the gas circuit breaker according to the present embodiment. FIG. 13A shows the insulating nozzle member in the open position (in the middle of the shut-off process). There is shown a mode in which an arc is generated between the fixed arc contact and the movable arc contact, and (b) shows a mode in which the insulating nozzle member and the like are in a fully open position. In addition, about the structure substantially common with the 1st-5th embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 12, in the gas circuit breaker 1J of the present embodiment, the end on the axially closing side of the tip 33J of the insulating nozzle member 30J is different from the tip 33 (see FIG. 2) of the first embodiment. It is not rounded, and its longitudinal section is rectangular. The distal end portion 33J has a cylindrical shape whose axial center extends in the axial direction, and the outer circumferential surface 30c extends in the circumferential direction and the axial direction.

  On the other hand, the surface that delimits the radially inner side of the main contact side end portion 55J of the fixed-side support member 50J is configured to be positioned radially inner as the distance from the inner peripheral surface 55a increases toward the axially open side. A flat surface (hereinafter simply referred to as a “taper surface”) 70 is formed. The tapered surface 70 extends in the circumferential direction of the fixed-side support member 50J, like the inner peripheral surface 55a, and faces the insulating nozzle member 30J in the radial direction. In the present embodiment, the tapered surface 70 extends over the entire circumference and forms an annular shape.

  In the middle of the interruption operation, as shown in FIG. 13A, an arc is generated between the movable arc contact 25 and the fixed arc contact 15 and enters the nozzle passage 35 on the radially inner side of the insulating nozzle member 30J. Hot gas is generated and the pressure rises. The high-pressure hot gas flows through the nozzle passage 35 to the axially closed side and flows into the exhaust tube 40, and flows to the axially open side and flows into the hollow portion 27 a of the operating rod 27.

  When the blocking operation is completed and the end portion 33J of the insulating nozzle member 30J and the main contact side end portion 55J of the fixed-side support member 50J are opposed to each other in the radial direction when they are in the fully open position shown in FIG. . At this time, the outer peripheral surface 30c of the tip end portion 33J, the inner peripheral surface 55a of the main contact-side end portion 55J, and the tapered surface 70 are opposed to each other in the radial direction. Between the outer peripheral surface 30c and the taper surface 70, a space 71 is formed in which the cross-sectional area of the flow path becomes smaller toward the axially open side. In the present embodiment, the space 71 has an annular shape.

  The high-pressure hot gas generated in the nozzle passage 35 flows into the space 71 and flows to the axially open side. The hot gas flowing in the space 71 on the axially open side is constricted between the outer peripheral surface 30c and the tapered surface 70 and flows out to the axially open side of the fixed-side support member 50J. Since the tapered surface 70 is inclined with respect to the axial direction so as to be located radially inward as it goes toward the axially open side, the hot gas flowing out from the fixed side support member 50J to the axially open side is the outer peripheral surface 30c. Along the axially open side. Thereby, it is suppressed that the fixed main contact 10 arrange | positioned radially outer side from the outer peripheral surface 30c is exposed to the flow of the hot gas which flowed out to the axial direction open | release side of the fixed side support member 50J. Can do.

[Other Embodiments]
In the gas circuit breaker 1J described above, the tapered surface 70 is formed over the entire circumference on the radially inner side of the main contact side end portion 55J of the fixed side support member 50J. The aspect of forming the tapered surface is not limited to this.

  For example, as in the gas circuit breaker 1K shown in FIGS. 14 and 15, the outer surface of the distal end portion 33K of the insulating nozzle member 30K is inclined with respect to the axial direction so as to be positioned radially outward toward the axially open side. The tapered surface 73 may be formed. Also according to this aspect, as shown in FIG. 15B, in the fully open position, the axial direction between the tip end portion 33K of the insulating nozzle member 30K and the main contact side end portion 55 of the stationary support member 50 is axial. A space 75 whose flow path cross-sectional area becomes smaller toward the open side can be formed. Also according to this aspect, it is possible to squeeze and discharge the hot gas flowing out from the stationary support member 50 to the axially open side.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1, 1C, 1E, 1G, 1H, 1J, 1K Gas circuit breaker 3 Container 5 Disappearance chamber 7, 8 Electrical insulator 10 Fixed main contact (fixed contact, main contact)
14 Main circuit conductor 15 Fixed arc contact (fixed contact, arc contact)
17 Radial conductor 20 Movable main contact (movable contact, main contact)
21 Operation rod support member 21e Exhaust hole 24 Main circuit conductor 25 Movable arc contact (movable contact, arc contact)
27 Operation rod 27a Hollow portion 27c Solid portion 27e Exhaust hole 28 Puffer mechanism 29 Cylinder member 30, 30C, 30E, 30G, 30J, 30K, insulating nozzle member 30a Inner peripheral surface 30c Outer peripheral surface 31 In the movable contact side end 31a Peripheral surface 32 Passage enlarged portion 32a Inner peripheral surface 33, 33C, 33E, 33G, 33J, 33K Tip end portion 33a Inner peripheral surface 34 Puffer chamber 35 Nozzle passage 40 Exhaust tubes 50, 50E, 50H, 50J, fixed side support member 51 Exhaust tube side end 53 Connection portion 53a Inner surface 55, 55E, 55H, 55J Main contact side end 55a Inner peripheral surface 57 Inner protrusion 57H Inner protrusion 57a Inner surface 57 Circumferential groove 60 Outer protrusion 61, 61G Outer protrusion Part 61c outer surface 63 circumferential groove 70 taper surface 71 space 73 taper surface 75 space

Claims (7)

A container having an extinguishing chamber, which is a space filled with an inert gas and where current interruption is performed,
A fixed arc contact fixed to the vessel and extending in the axial direction;
A fixed main contact that is fixed to the container, is provided coaxially with the fixed arc contact, and extends in a circumferential direction on a radially outer side of the fixed arc contact;
A fully open position that is arranged in the extinguishing chamber so as to be movable in the axial direction, so that a current flows in a closed position in contact with the fixed main contact and is separated from the fixed main contact when the current is interrupted A movable main contact that moves axially to the open side,
It is arranged in the extinguishing chamber so as to move in the axial direction together with the movable main contact, and moves to the open side in the axial direction so as to be separated from the fixed arc contact so as to be between the fixed arc contact. A movable arc contact capable of generating an arc;
A fixed-side support member extending in a circumferential direction on the radially outer side of the fixed arc contact, connected to the fixed main contact, and extending toward the axially closing side;
It is composed of an electrical insulator, and is radially inward of the fixed side support member, the fixed main contact and the movable main contact, and is axially outside the movable arc contact and the fixed arc contact. Insulating nozzle having a substantially cylindrical shape extending in the direction and having a nozzle passage through which an inert gas can flow radially inward, and moves to the axially open side together with the movable main contact and the movable arc contact Members,
A puffer mechanism that compresses the inert gas and supplies the compressed inert gas to the nozzle passage as the insulating nozzle member moves from the closed position to the fully opened position in the axial direction.
With
An arc generated between the fixed arc contact and the movable arc contact passes through the nozzle passage during a shut-off operation in which the insulating nozzle member moves from the closed position to the fully opened position in the axial direction. In addition, the nozzle passage receives a supply of compressed inert gas from the puffer mechanism,
The front end portion which is the end portion on the axially closing side of the insulating nozzle member is, in the fully open position, the main contact side end portion which is the end portion on the fixed main contact side of the fixed side support member, and A gas circuit breaker configured to be opposed in a radial direction. The tip portion is provided with an outer protruding portion that protrudes radially outward and extends in the circumferential direction,
2. The gas circuit breaker according to claim 1, wherein the outer protruding portion is configured to face the main contact side end portion in a fully open position. 3. The circumferential groove that is recessed radially inward and extending in the circumferential direction from an outer surface facing the main contact side end portion is formed in the outer protrusion. Gas circuit breaker. The main contact-side end is provided with an inner protrusion that protrudes radially inward and extends in the circumferential direction,
The gas circuit breaker according to any one of claims 1 to 3, wherein the inner projecting portion is configured to face the tip portion in a fully open position. 5. The gas circuit breaker according to claim 4, wherein the inner projecting portion is formed with a circumferential groove recessed radially outward from an inner surface facing the tip portion and extending in the circumferential direction. The tip portion has an outer peripheral surface extending in the circumferential direction and the axial direction,
The main contact-side end portion is tapered toward the outer peripheral surface so as to face the outer peripheral surface in the radial direction in the fully open position and to be positioned radially inward toward the axially open side. The gas circuit breaker according to claim 1 or 2, wherein the surface is formed. The main contact side end portion has an inner peripheral surface extending in the circumferential direction and the axial direction,
The tip portion has a tapered surface that is inclined with respect to the inner peripheral surface so as to be opposed to the inner peripheral surface in the radial direction at the fully open position and to be positioned on the radially outer side toward the axially open side. The gas circuit breaker according to claim 1 or 2, wherein the gas circuit breaker is formed.

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