Switching device

Abstract

An opening / closing device (100) comprises: a sealed container (1) in which an insulation gas is sealed; a fixed electrode (5) which is provided inside the sealed container (1); a movable electrode (3) which is provided in a movable manner inside the sealed container (1) and has a cylindrical cylinder (32), a piston (33) that is provided inside the cylinder (32), and a movable-side contact (31) that is smaller in diameter than the cylinder (32) and is fixed to the piston (33), the movable-side contact (31) having formed therein a ventilation hole (312a) for connecting the space inside the movable-side contact (31) to a buffer chamber (41) that is a space formed between the cylinder (32) and the movable-side contact (31); and a crossflow formation part (42) which causes a gas flow to include a component that is in a direction orthogonal to the central axis of the movable-side contact (31), the gas flow being drawn in by the movable-side contact (31) during an opening operation for transitioning from a closed state in which the movable electrode (3) is in contact with the fixed electrode (5) to an open state in which the movable electrode (3) is separated from the fixed electrode (5).

Description

Technical Field

[0001] The present disclosure relates to a switching device that interrupts current within a sealed container filled with an insulating gas.

Background Art

[0002] Conventionally, as a device for interrupting high-voltage current, a switching device that interrupts current within a sealed container filled with an insulating gas is known. The switching device includes a fixed electrode fixed within the sealed container and a movable electrode installed movably within the sealed container. In the closed electrode state where the movable electrode and the fixed electrode are in contact, current is passed, and in the open electrode state where the movable electrode is separated from the fixed electrode, the current is interrupted.

[0003] During the opening operation of transitioning from the closed electrode state to the open electrode state, an arc is generated between the movable electrode and the fixed electrode. When an arc exists between the movable electrode and the fixed electrode, current flows even though the movable electrode and the fixed electrode are not in contact. Therefore, it is required to quickly extinguish the arc generated between the movable electrode and the fixed electrode during the opening operation.

[0004] Patent Document 1 discloses a switching device that uses air as an insulating medium, forms a negative pressure chamber with a cylindrical movable contact, a piston interlocked with the movable contact, and a cylinder, and improves the arc extinguishing performance by increasing the suction flow rate of air near the surface of the opening at the tip of the movable contact by the pressure of the negative pressure chamber during the opening operation.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the switchgear disclosed in Patent Document 1, the opening at the tip of the movable contact opens in the same direction as the opening / closing operating axis of the movable contact. In this case, the gas drawn into the opening also flows in the direction of the device axis. The arc generated between the opposing ends of the fixed contact and the movable contact when the current is interrupted also occurs in the same direction as the opening / closing operating axis of the movable contact. As a result, only a portion of the gas flow generated near the creepage of the opening that flows near the arc contributes to cooling the arc, and the majority does not contribute to cooling the arc.

[0007] This disclosure has been made in view of the above, and aims to provide a switchgear with improved arc cooling performance. [Means for solving the problem]

[0008] To solve the above-mentioned problems and achieve the objective, the switchgear according to this disclosure comprises a sealed container filled with insulating gas, a fixed electrode installed inside the sealed container, a cylindrical cylinder, a piston installed inside the cylinder, and a movable contact smaller in diameter than the cylinder and fixed to the piston, which is movably installed inside the sealed container, and the movable contact has a ventilation hole formed therein that connects a buffer chamber, which is the space formed between the cylinder and the movable contact, to the space inside the movable contact. The switchgear also comprises a cross-flow forming unit that includes a component perpendicular to the central axis of the movable contact in the gas flow drawn into the movable contact during an opening operation, when the movable electrode moves from a closed state in contact with the fixed electrode to an open state where the movable electrode is separated from the fixed electrode. [Effects of the Invention]

[0009] According to this disclosure, it is possible to obtain a switchgear with improved arc cooling performance. [Brief explanation of the drawing]

[0010] [Figure 1] Cross-sectional view of the opening / closing device according to Embodiment 1 [Figure 2] Cross-sectional view of the opening / closing device according to Embodiment 1 [Figure 3] Expanded view of the movable part of the movable electrode of the opening / closing device according to Embodiment 1 [Figure 4] Perspective view of the support base of the opening / closing device according to Embodiment 1 [Figure 5] Diagram showing the arc extinguishing operation during the opening pole operation of the opening / closing device according to Embodiment 1 [Figure 6] Expanded view of the movable part of the movable electrode of the opening / closing device according to Embodiment 2 [Figure 7] Schematic diagram of the gas flow generated in the movable electrode of the opening / closing device according to Embodiment 2 [Figure 8] Perspective view of the cross-flow forming part of the opening / closing device according to Embodiment 3 [Figure 9] Side view of the cross-flow forming part of the opening / closing device according to Embodiment 3 [Figure 10] Diagram schematically showing the gas flow of the opening / closing device according to Embodiment 3 [Figure 11] Expanded view of the movable part of the movable electrode of the opening / closing device according to Embodiment 4 [Figure 12] Cross-sectional view of the opening / closing device according to Embodiment 5 [Figure 13] Expanded view of the movable part of the movable electrode of the opening / closing device according to Embodiment 5 [Figure 14] Expanded view of the movable part of the movable electrode of the opening / closing device according to Embodiment 6 [Figure 15] Diagram showing the magnetic field lines generated by the permanent magnet of the movable electrode of the opening / closing device according to Embodiment 6 [Figure 16] Diagram showing the opening pole operation of the opening / closing device according to Embodiment 6

Embodiments for Carrying Out the Invention

[0011] Hereinafter, the opening / closing device according to the embodiment will be described in detail based on the drawings. Note that the present invention is not limited by this embodiment.

[0012] Embodiment 1. FIG. 1 and FIG. 2 are cross-sectional views of the opening / closing device according to Embodiment 1. The opening / closing device 100 includes a sealed container 1 filled with an insulating gas, a fixed electrode 5 installed inside the sealed container 1, and a movable electrode 3 installed movably inside the sealed container 1. Note that FIG. 1 shows a closed electrode state in which the movable electrode 3 and the fixed electrode 5 described later are in contact with each other, and FIG. 2 shows an open electrode state in which the movable electrode 3 and the fixed electrode 5 are separated from each other.

[0013] The fixed electrode 5 includes a cylindrical fixed-side contact 51, and the movable electrode 3 includes a cylindrical movable-side contact 31 that is thinner than the fixed-side contact 51. The outer diameter of the movable-side contact 31 is slightly larger than the inner diameter of the fixed-side contact 51. In the closed electrode state, the movable-side contact 31 and the fixed-side contact 51 are in close contact with each other due to the elastic forces of the movable-side contact 31 and the fixed-side contact 51, respectively. Here, a configuration in which the fixed-side contact 51 is a cylindrical shape with a larger diameter than the movable-side contact 31 is taken as an example, but the fixed-side contact 51 may be a tulip type. Note that the state in which the movable-side contact 31 and the fixed-side contact 51 are in contact with each other is referred to as the "closed electrode state", and the state in which the movable-side contact 31 is separated from the fixed-side contact 51 is referred to as the "open electrode state".

[0014] The opening / closing device 100 closes by the movable electrode 3 contacting the fixed electrode 5 and opens by the movable electrode 3 separating from the fixed electrode 5.

[0015] In addition to the movable-side contact 31, the movable electrode 3 includes a cylinder 32 having a cylindrical shape with a larger diameter than the movable-side contact 31, a piston 33 installed inside the cylinder 32, and a rod 34 to which the piston 33 is fixed. The rod 34 is connected to an operating rod of an operating device (not shown) and moves the piston 33 by a driving force transmitted from the operating device (not shown). As the piston 33 moves, the movable-side contact 31 moves inside the cylinder 32.

[0016] Figure 3 is an enlarged view of the movable part of the movable electrode of the switchgear according to Embodiment 1. The movable contact 31 comprises a first part 311 that contacts and separates from the fixed contact 51, and a second part 312 that supports the first part 311. As shown in Figures 1 and 2, the second part 312 is fixed to the piston 33. A support base 35, a first cylinder 371, and a second cylinder 372 are installed inside the movable contact 31. The support base 35 is made of a non-magnetic material such as a non-magnetic metal or an insulator. The first cylinder 371 is made of a magnetic material, and the second cylinder 372 is made of a non-magnetic material.

[0017] Figure 4 is a perspective view of the support base of the opening / closing device according to Embodiment 1. The support base 35 comprises a cylindrical holding portion 351 into which the rod-shaped member 39 is fitted, and support legs 352 extending radially outward from the outer peripheral surface 351a of the holding portion 351.

[0018] As shown in Figure 3, the support base 35 is fixed inside the movable contact 31 by sandwiching the support legs 352 between the first cylinder 371 and the second cylinder 372. By forming slits in the first cylinder 371 and the second cylinder 372 and fitting the support legs 352 into the slits, it is possible to prevent the support base 35 from rotating around the axis of the movable contact 31.

[0019] The rod-shaped member 39 is made of a non-magnetic material. The rod-shaped member 39 has an insulating layer 40 on its surface. The insulating layer 40 is formed by wrapping an insulating tape around the non-magnetic core material or by molding an insulating material. A cross-flow forming portion 42 is formed at the fixed end of the rod-shaped member 39. The cross-flow forming portion 42 is frustum-shaped, with its diameter uniformly increasing as it approaches the fixed-side contact 51 along the axial direction of the movable-side contact 31. That is, the outer circumferential surface 421 of the cross-flow forming portion 42 is a linear tapered surface in which the distance from the central axis of the movable-side contact 31 uniformly increases toward the end 422 facing the fixed-side contact 51, and is a surface that is inclined with respect to the central axis of the movable-side contact 31.

[0020] The gap between the rod-shaped member 39 and the movable contact 31 forms a nozzle portion 60 through which insulating gas passes. The rod-shaped member 39 is installed such that the cross-flow forming portion 42 protrudes toward the fixed contact 51 side more than the fixed end of the movable contact 31, or that the fixed end of the movable contact 31 and the cross-flow forming portion 42 are flush.

[0021] A vent hole 312a that penetrates radially is formed in the second portion 312 of the movable contact 31. A buffer chamber 41 is formed between the cylinder 32 and the movable contact 31. The volume of the buffer chamber 41 changes as the piston 33 moves. In a closing operation, transitioning from an open state to a closed state, the volume of the buffer chamber 41 decreases, and in an opening operation, transitioning from a closed state to an open state, the volume of the buffer chamber 41 increases.

[0022] When the volume of the puffer chamber 41 increases, gas from inside the sealed container 1 is drawn in through the opening at the fixed end of the movable contact 31, and a gas flow is generated in the nozzle portion 60 in the gap between the movable contact 31 and the rod-shaped member 39.

[0023] Figure 5 shows the arc extinguishing operation during the opening operation of the switchgear according to Embodiment 1. Figure 5 shows the arc extinguishing operation during the opening operation in a cross-section of the movable electrode 3. In Figure 5, the gas flow generated by the increase in volume of the buffer chamber 41 is indicated by a dashed arrow. When the movable contact 31 separates from the fixed contact 51 during the opening operation, an arc 70 is generated between the movable contact 31 and the fixed contact 51. In Figure 5, the arc 70 is generated at position P. The arc 70 generated between the movable contact 31 and the fixed contact 51 is drawn into the movable contact 31 by the gas flow generated in the nozzle section 60 as the volume of the buffer chamber 41 increases. In Figure 5, the arc 70 moves from position P to position Q by the gas flow generated in the nozzle section 60.

[0024] Because the rod-shaped member 39 on which the intersecting flow forming section 42 is formed is positioned at the opening of the movable contact 31, the insulating gas drawn into the nozzle section 60 has a gas flow outside the cylinder of the movable contact 31 that includes a radial component toward the central axis of the movable contact 31. As it enters the cylinder of the movable contact 31, the radial component perpendicular to the axial direction of the central axis of the movable contact 31 decreases, and the flow changes to one parallel to the axial direction. Therefore, outside the cylinder of the movable contact 31, the gas flow of the insulating gas intersects with the arc 70. Consequently, outside the cylinder of the movable contact 31, the arc 70 is blown with a low-temperature gas flow that is not heated by the arc 70, which promotes the cooling of the arc 70 and improves arc extinguishing performance.

[0025] Since an insulating layer 40 is formed on the surface of the rod-shaped member 39, when the arc 70 touches the insulating layer 40 on the surface of the rod-shaped member 39, the insulating material forming the insulating layer 40 evaporates due to the heat of the arc 70, generating an insulating gas. The insulating gas generated from the insulating layer 40 on the surface of the rod-shaped member 39 mixes with the arc 70, further cooling the arc 70 and making it easier to extinguish. If the insulating layer 40 is worn down by the arc 70, the original condition can be restored by removing the rod-shaped member 39 from the support base 35, re-wrapping it with insulating tape, or replacing it with another rod-shaped member 39.

[0026] The switchgear 100 according to Embodiment 1 generates a gas flow containing a radial component perpendicular to the axial direction of the central axis of the movable contact 31 at the fixed-side opening of the movable contact 31. This allows the gas flow to intersect with the arc 70, improving the cooling performance of the arc 70. Therefore, the switchgear 100 according to Embodiment 1 can obtain the required shutoff performance to meet the switching obligations even when dry air is used as the insulating gas sealed in the sealed container 1.

[0027] In the above description, the outer surface 421 of the intersecting flow forming section 42 was described as a linear tapered surface, but the outer surface 421 of the intersecting flow forming section 42 may be a parabolic tapered surface or a logarithmic tapered surface. By making the outer surface 421 of the intersecting flow forming section 42 a parabolic tapered surface or a logarithmic tapered surface, a gas flow with a high proportion of components perpendicular to the axial direction of the movable contact 31 can be generated outside the cylinder of the movable contact 31, thereby further improving the arc extinguishing performance of the arc 70. In addition, by making the intersecting flow forming section 42 T-shaped in side view, the proportion of components perpendicular to the axial direction of the gas flow generated outside the cylinder of the movable contact 31 can be further increased. However, if the gas flow path is bent, the flow resistance increases and the gas flow velocity tends to decrease. Therefore, from the viewpoint of preventing an increase in flow resistance, it is preferable that the outer surface 421 of the intersecting flow forming section 421 be a tapered surface.

[0028] Embodiment 2. Figure 6 is an enlarged view of the movable portion of the movable electrode of the switch / open / close device according to Embodiment 2. The switch / open / close device 100 according to Embodiment 2 differs from the switch / open / close device 100 according to Embodiment 1 in that the cross-flow forming portion 42 formed at the fixed end of the rod-shaped member 39 is teardrop-shaped in side view.

[0029] Figure 7 is a schematic diagram of the gas flow generated at the movable electrode of the switchgear according to Embodiment 2. Because the cross-flow forming section 42 has a teardrop shape in side view, no gas reservoir of insulating gas heated by the arc 70 is formed in the region 11 adjacent to the fixed side of the cross-flow forming section 42. Therefore, the switchgear 100 according to Embodiment 2 can prevent the re-arcing of the arc 70 caused by the accumulation of high-temperature insulating gas near the movable contact 31.

[0030] Embodiment 3. Figure 8 is a perspective view of the cross-flow forming section of the switch / open / close device according to Embodiment 3. Figure 9 is a side view of the cross-flow forming section of the switch / open / close device according to Embodiment 3. The switch / open / close device 100 according to Embodiment 3 differs from the switch / open / close device 100 according to Embodiment 1 in that the cross-flow forming section 42 is windmill-shaped. In the switch / open / close device 100 according to Embodiment 3, the cross-flow forming section 42 is windmill-shaped by forming a spiral groove 423 on a frustocone. The side surface 424 of the groove 423 is an inclined surface whose position around the axis changes along the axial direction of the central axis of the movable contact element 31.

[0031] Figure 10 is a schematic diagram showing the gas flow of the opening / closing device according to Embodiment 3. Due to the arrangement of the windmill-shaped intersecting flow forming section 42, the gas flow is straightened by the side surface of the groove 423, and a spiral gas flow is formed inside the cylinder of the movable contact 31 around the central axis of the movable contact 31.

[0032] Because the gas flow inside the cylinder of the movable contact 31 is spiral, a low-temperature gas flow is blown onto the arc 70 even inside the movable contact 31, improving arc extinguishing performance.

[0033] Embodiment 4. Figure 11 is an enlarged view of the movable part of the movable electrode of the switchgear according to Embodiment 4. The switchgear 100 according to Embodiment 4 differs from the switchgear 100 according to Embodiment 1 in that it does not have a rod-shaped member 39, and the cross-flow forming part 42 is supported by a support base 35.

[0034] The switchgear according to Embodiment 4, like the switchgear 100 according to Embodiment 1, generates a gas flow containing a radial component perpendicular to the axial direction of the central axis of the movable contact 31 at the fixed-side opening of the movable contact 31. This allows the gas flow and the arc to intersect, improving the cooling performance of the arc 70. Therefore, the switchgear 100 according to Embodiment 4 can obtain the required shutoff performance to meet the switching duties even when dry air is used as the insulating gas sealed in the sealed container 1.

[0035] Embodiment 5. Figure 12 is a cross-sectional view of the switchgear according to Embodiment 5. Figure 13 is an enlarged view of the movable portion of the movable electrode of the switchgear according to Embodiment 5. The switchgear 100 according to Embodiment 5 does not include a support base 35, a first cylinder 371, a second cylinder 372, and a rod-shaped member 39. Also, the movable contact 31 is not divided into a first portion 311 and a second portion 312, but is formed as a single unit. Otherwise, it is the same as the switchgear 100 according to Embodiment 1.

[0036] A cross-flow forming portion 313 is formed at the fixed end of the movable contact 31. The cross-flow forming portion 313 has a tapered surface in which the distance from the central axis of the movable contact 31 uniformly increases as it approaches the fixed contact 51 along the axial direction of the movable contact 31. In other words, the cross-flow forming portion 313 has a surface that is inclined with respect to the central axis of the movable contact 31.

[0037] During the opening operation, the gas flow drawn into the movable contact 31 flows along the tapered surface of the cross-flow forming section 313. As it is drawn into the movable contact 31, the component directed toward the central axis of the movable contact 31 decreases, and the flow changes to one parallel to the axial direction of the movable contact 31.

[0038] The switchgear 100 according to Embodiment 5, like the switchgear 100 according to Embodiment 1, generates a gas flow containing a radial component perpendicular to the axial direction of the central axis of the movable contact 31 at the fixed-side opening of the movable contact 31. This allows the gas flow and the arc to intersect, improving the cooling performance of the arc 70. Therefore, the switchgear 100 according to Embodiment 5 can obtain the shutoff performance required to perform the switching duties even when dry air is used as the insulating gas sealed in the sealed container 1.

[0039] Embodiment 6. Figure 14 is an enlarged view of the movable part of the movable electrode of the switchgear according to Embodiment 6. In the switchgear 100 according to Embodiment 6, the rod-shaped member 39 is made of a magnetic material, and a permanent magnet 36 is fitted into the support base 35. The rod-shaped member 39 is installed in close contact with the fixed side of the permanent magnet 36. A cap 43 is installed at the fixed end of the rod-shaped member 39. The cap 43 is frustum-shaped, with its diameter uniformly increasing along the axial direction of the movable contact 31 from the movable contact 31 toward the fixed contact 51. That is, the outer circumferential surface 431 of the cap 43 is a linear tapered surface with its diameter uniformly increasing toward the end 432 facing the fixed contact 51, and is inclined with respect to the axial direction. In Embodiment 6, the cross flow forming portion 42, which has a surface inclined with respect to the central axis of the movable contact 31, is composed of the cap 43.

[0040] In the opening / closing device 100 according to Embodiment 6, the holding portion 351 has an opening on the fixed-side contact 51 side that is smaller than the permanent magnet 36 in the direction of arrangement between the movable-side contact 31 and the fixed-side contact 51, and an opening on the movable-side contact 31 side that is larger than the permanent magnet 36 in the direction of arrangement between the movable-side contact 31 and the fixed-side contact 51, and the permanent magnet 36 is fitted into the opening on the movable-side contact 31 side in the direction of arrangement between the movable-side contact 31 and the fixed-side contact 51. The opening of the holding portion 351 on the movable-side contact 31 side in the direction of arrangement between the movable-side contact 31 and the fixed-side contact 51 is closed by a cover 38 made of magnetic material to prevent the permanent magnet 36 from falling out of the holding portion 351. A rod-shaped member 39 is fitted into the fixed-side opening of the holding portion 351, and as described above, the rod-shaped member 39 is in close contact with the permanent magnet 36.

[0041] Figure 15 shows the magnetic field lines generated by the permanent magnet of the movable electrode of the opening / closing device according to Embodiment 6. Since the rod-shaped member 39 and the lid 38 are made of magnetic material, while the support base 35 is made of non-magnetic material, the magnetic field lines generated by the permanent magnet 36, indicated by the arrows in Figure 15, easily pass through the rod-shaped member 39 and the lid 38, but not easily pass through the support leg 352. Furthermore, since the first cylinder 371 is made of magnetic material, while the second cylinder 372 is made of non-magnetic material, and the rod-shaped member 39 is longer than the lid 38, the magnetic field generated by the permanent magnet 36 on the side where the fixed contact 51 is installed is stronger than the magnetic field generated by the permanent magnet 36 on the opposite side from where the fixed contact 51 is installed. While magnetic field lines pass more easily through the rod-shaped member 39 when it is in close contact with the permanent magnet 36, even if a magnetic gap exists between the rod-shaped member 39 and the permanent magnet 36, the magnetic field generated by the permanent magnet 36 on the side where the fixed-side contact 51 is installed can be made stronger than the magnetic field generated by the permanent magnet 36 on the opposite side from where the fixed-side contact 51 is installed. Furthermore, the first cylinder 371 may be made of a non-magnetic material. Even if the first cylinder 371 is made of a non-magnetic material, since the rod-shaped member 39 is installed adjacent to the fixed side of the permanent magnet 36, the magnetic field generated by the permanent magnet 36 on the side where the fixed-side contact 51 is installed can be made stronger than the magnetic field generated by the permanent magnet 36 on the opposite side from where the fixed-side contact 51 is installed.

[0042] Figure 16 shows the opening operation of the switchgear according to Embodiment 6. When the arc 70 generated during the opening operation approaches the rod-shaped member 39, the arc 70 is captured by the magnetic field of the permanent magnet 36. The magnetic field lines that emerge from the permanent magnet 36 and pass through the rod-shaped member 39 include a component that intersects with the arc 70 generated between the movable contact 31 and the fixed contact 51, so the arc 70 rotates within the magnetic field generated by the permanent magnet 36. In Figure 16, the arc 70 captured by the magnetic field generated by the permanent magnet 36 is pulled in while rotating, moving from position B to position C, and then from position C to position D. During the opening operation, the arc 70 generated between the movable contact 31 and the fixed contact 51 is pulled into the movable contact 31 while rotating, and is stretched, cooled, and extinguished.

[0043] The opening / closing device 100 according to Embodiment 6 generates a gas flow containing a radial component perpendicular to the axial direction of the central axis of the movable contact 31 at the fixed-side opening of the movable contact 31, and further improves the arc extinguishing performance of the arc 70 by stretching the arc 70 with the magnetic field generated by the permanent magnet 36.

[0044] In the switchgear 100 according to Embodiment 6, the shape of the cross-flow forming section 42 may be a teardrop shape or a windmill shape. When the cross-flow forming section 42 is windmill shaped, the switchgear 100 is used to interrupt DC current, and by making the rotation direction of the arc 70 due to the magnetic field generated by the permanent magnet 36 and the rotation direction of the gas flow by the cross-flow forming section 42 opposite, low-temperature insulating gas that has not been heated by the arc 70 can be blown onto the arc 70 as a gas flow, thereby further improving arc extinguishing performance.

[0045] The configurations shown in the above embodiments are merely examples of the content, and can be combined with other known technologies. It is also possible to omit or modify parts of the configuration without departing from the gist of the invention. [Explanation of Symbols]

[0046] 1 sealed container, 3 movable electrode, 5 fixed electrode, 11 region, 31 movable contact, 32 cylinder, 33 piston, 34 rod, 35 support base, 36 permanent magnet, 38 lid, 39 rod-shaped member, 40 insulating layer, 41 puffer chamber, 42, 313 cross-flow forming section, 43 cap, 51 fixed contact, 60 nozzle section, 70 arc, 100 opening / closing device, 311 first section, 312 second section, 312a ventilation hole, 351 holding section, 351a, 421, 431 outer surface, 352 support leg, 371 first cylinder, 372 second cylinder, 422, 432 end section, 423 groove, 424 side surface.

Claims

1. A sealed container filled with insulating gas, A fixed electrode installed inside the sealed container, The device comprises a cylindrical cylinder, a piston installed inside the cylinder, and a movable contact having a smaller diameter than the cylinder and fixed to the piston, and is movably installed inside the sealed container, the movable contact having a vent hole that connects the buffer chamber, which is the space formed between the cylinder and the movable contact, to the space inside the movable contact, The system includes a cross-flow forming section that, during an opening operation in which the movable electrode transitions from a closed state in which the movable electrode is in contact with the fixed electrode to an open state in which the movable electrode is separated from the fixed electrode, includes a component in the direction perpendicular to the central axis of the movable contact in the gas flow drawn into the movable contact, The opening and closing device is characterized in that the cross-flow forming portion is arranged on the central axis of the movable contact.

2. A support base installed inside the movable contact element, The support base comprises a rod-shaped member installed adjacent to the side where the fixed electrode is positioned, The opening and closing device according to claim 1, characterized in that the cross-flow forming portion is provided at the tip of the rod-shaped member.

3. The support base is equipped with a permanent magnet, The opening and closing device according to claim 2, characterized in that the rod-shaped member is made of a magnetic material.

4. The opening / closing device according to any one of claims 1 to 3, characterized in that the cross-flow forming portion has a shape in which the diameter increases along the direction from the movable electrode toward the fixed electrode in the axial direction of the central axis of the movable contactor.

5. The opening and closing device according to any one of claims 1 to 3, characterized in that the cross-flow forming portion has a teardrop shape when viewed from a direction perpendicular to the axial direction of the movable contact.

6. The opening and closing device according to any one of claims 1 to 3, characterized in that the cross-flow forming portion has a windmill shape with an inclined surface whose position around the axis changes along the axial direction of the central axis of the movable contactor.

7. A sealed container filled with insulating gas, A fixed electrode installed inside the sealed container, The device comprises a cylindrical cylinder, a piston installed inside the cylinder, and a movable contact having a smaller diameter than the cylinder and fixed to the piston, and is movably installed inside the sealed container, the movable contact having a vent hole that connects the buffer chamber, which is the space formed between the cylinder and the movable contact, to the space inside the movable contact, The system includes a cross-flow forming section that, during an opening operation in which the movable electrode transitions from a closed state in which the movable electrode is in contact with the fixed electrode to an open state in which the movable electrode is separated from the fixed electrode, includes a component in the direction perpendicular to the central axis of the movable contact in the gas flow drawn into the movable contact, The opening and closing device is characterized in that the cross-flow forming portion has a teardrop shape when viewed from a direction perpendicular to the axial direction of the movable contact.

8. A sealed container filled with insulating gas, A fixed electrode installed inside the sealed container, The device comprises a cylindrical cylinder, a piston installed inside the cylinder, and a movable contact having a smaller diameter than the cylinder and fixed to the piston, and is movably installed inside the sealed container, the movable contact having a vent hole that connects the buffer chamber, which is the space formed between the cylinder and the movable contact, to the space inside the movable contact, The system includes a cross-flow forming section that, during an opening operation in which the movable electrode transitions from a closed state in which the movable electrode is in contact with the fixed electrode to an open state in which the movable electrode is separated from the fixed electrode, includes a component in the direction perpendicular to the central axis of the movable contact in the gas flow drawn into the movable contact, The opening and closing device is characterized in that the cross-flow forming portion has a windmill shape with an inclined surface whose position around the axis changes along the axial direction of the central axis of the movable contact.

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