Vacuum valve

Abstract

Provided is a vacuum valve capable of improving the magnetic field strength in the axial direction even in a contact part in an area other than an area of a contact part corresponding to an area surrounded by an arm part and a coil part. In a vacuum valve according to the present disclosure, a detour part of respective coil electrodes (7) comprises: a second coil part (74) extending with a portion overlapping with a corresponding first coil part (70) and power supply part (71) in a circumferential direction, the power supply part (71) facing the first coil part (70); a first arm part (72) connecting the second coil part (74) and a ring part (75); and a second arm part (73) connecting the second coil part (74) and the first coil part (70).

Description

[Technical field]

[0001] The present disclosure relates to a vacuum valve in which an arc that occurs when a current is interrupted is diffused by a magnetic field generated by a current flowing through an electrode. [Background technology]

[0002] The vacuum valve comprises a cylindrical vacuum vessel, electrode rods provided at both ends of the vacuum vessel, annular coil electrodes provided at the opposing ends of each electrode rod, disk-shaped contacts, and a support member that reinforces the contacts. The vacuum valve connects or disconnects a fixed contact and a movable contact by moving one of the electrode rods in the axial direction to pass or break electricity. The coil electrode here generates an axial magnetic field in the direction of contact and separation of the fixed contact and movable contact as main electrodes. The coil electrode is divided into a plurality of arc-shaped coil portions arranged on the back side of both contacts in the circumferential direction along the outer periphery of the contacts. Furthermore, coil One end of the coil has an arm that faces the axial direction, and the other end has a connection that connects to the contact. In order to increase the interrupting capacity of the vacuum interrupter, it is essential to develop the structure of this coil electrode and the contact material, and various research efforts have been made to date. As a result, it has been found that the interrupting performance of a vacuum interrupter is better when the axial magnetic field strength generated by the coil electrode is stronger.

[0003] In the electrode of Patent Document 1, the electrode includes a ring-shaped coil electrode, a contact, and a reinforcing part for reinforcing the contact. The movable electrode bar is connected to an operating mechanism provided in a switch body such as a vacuum circuit breaker, and the movable electrode bar is moved in the axial direction to bring both contacts into contact with each other or separate them to pass or cut off electricity. The coil electrode has a fitting part at its center, which is fitted into the fitting part of the fixed electrode bar or the fitting part of the movable electrode bar and then fixed. In order to generate an axial magnetic field in the contact and separation direction of the contacts as the main electrodes, a plurality of arc-shaped coil parts are divided and arranged in the circumferential direction (the circumferential direction along the outer periphery of the contacts) on the back side of both contacts. One end of the coil part has an arm part in the axial direction, and the other end has a power supply part protruding to contact the contacts. A slit is provided between the arm part and the power supply part to divide the coil part and correct the flow of current. With this structure, the current flowing from the fixed electrode bar or the movable electrode bar passes through a path from the arm portion through the coil portion and the power supply portion, and is supplied to the contacts via the power supply portion. In the vacuum valve as described above, when a current flows in the circumferential direction in the coil portion, a magnetic field in the axial direction of the vacuum valve (axial magnetic field) can be generated according to the right-hand rule. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-150902 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the vacuum valve of Patent Document 1, a circumferential current flows through the coil electrodes, which intensifies the magnetic field in the contact area (hereinafter, sometimes referred to as the "axial magnetic field generating area") corresponding to the area surrounded by the arm and coil, and the necessary axial magnetic field strength can be ensured. On the other hand, there is a problem in that the shape of the coil electrodes for improving the axial magnetic field strength has not been sufficiently considered for contact areas other than the axial magnetic field generating area. As a result, for example, effective axial magnetic field strength cannot be ensured in the center of the contact area, or in contact areas located above the arm or power supply.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to obtain a vacuum valve that can improve the axial magnetic field strength even in contact parts other than the axial magnetic field generating area. [Means for solving the problem]

[0007] a first arm portion connecting the second arm portion and the first coil portion; a second arm portion connecting the first coil portion and the second coil portion; a first arm portion connecting the first coil portion and the second coil portion; a second arm portion connecting the first coil portion and the second coil portion; a first arm portion connecting the first coil portion and the second coil portion; a second arm portion connecting the second coil portion and the first coil portion; Between the second coil portion and the ring portion, a first notch is formed extending in the circumferential direction along the ring portion, and between the second coil portion and the first coil portion, a second notch is formed extending in the circumferential direction along the first coil portion and the opposing power supply portion, and the coil electrode has a heat dissipation portion extending in the circumferential direction from one end of the second coil portion on a side closer to the first coil portion through the first notch. It is characterized by: Effect of the Invention

[0008] According to the vacuum valve of the present disclosure, it is possible to improve the axial magnetic field strength also in contact parts other than the axial magnetic field generating region. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic cross-sectional view showing the structure of a vacuum interrupter according to a first embodiment. [Diagram 2] 1 is an exploded perspective view showing the configuration of an electrode structure of a vacuum interrupter according to a first embodiment. [Diagram 3] 1 is a schematic front view showing the electrode structure of a vacuum interrupter according to a first embodiment. [Figure 4] FIG. 13 is an exploded perspective view showing a configuration of an electrode structure according to a comparative example. [Diagram 5] FIG. 11 is a front schematic view showing an electrode structure according to a comparative example. [Figure 6] 3 is a schematic front view showing the dimensional relationship of the coil electrodes of the vacuum interrupter according to the first embodiment. FIG. [Figure 7] FIG. 11 is a schematic front view showing the electrode structure of the vacuum interrupter according to the second embodiment. [Figure 8] FIG. 11 is a schematic front view showing the electrode structure of a vacuum interrupter according to a third embodiment. [Figure 9] FIG. 11 is a schematic front view showing the electrode structure of a vacuum interrupter according to a fourth embodiment. [Figure 10] FIG. 11 is a schematic cross-sectional view showing the structure of a vacuum interrupter according to a fourth embodiment. [Figure 11] FIG. 11 is a schematic front view showing a first modified example of the structure of the vacuum interrupter according to the fourth embodiment. [Figure 12] FIG. 13 is a schematic front view showing a second modified example of the structure of the vacuum interrupter according to the fourth embodiment. [Figure 13] FIG. 11 is a schematic cross-sectional view showing the structure of a vacuum interrupter according to a fifth embodiment. [Figure 14] FIG. 13 is an exploded perspective view showing the configuration of the electrode structure of the vacuum interrupter according to embodiment 5. [Figure 15] FIG. 13 is a schematic front view of a coil electrode of a vacuum interrupter according to a fifth embodiment. [Figure 16] FIG. 13 is a schematic side view of the electrode structure of the vacuum interrupter according to embodiment 5. [Figure 17] FIG. 13 is a schematic rear view showing the coil electrode of the vacuum interrupter according to embodiment 5. [Figure 18] FIG. 13 is a schematic rear view of the windmill plate of the vacuum interrupter according to embodiment 5. [Figure 19] FIG. 13 is an explanatory diagram illustrating a state in which the windmill plate and the coil electrode of the vacuum interrupter according to the fifth embodiment are combined. [Figure 20] 13 is a schematic rear view of a coil electrode of a vacuum interrupter according to embodiment 6. FIG. [Figure 21] FIG. 13 is a schematic rear view of the wind turbine panel according to the sixth embodiment. [Figure 22] FIG. 13 is a schematic front view illustrating a current flow in the coil electrodes of a vacuum interrupter according to a sixth embodiment. [Diagram 23] FIG. 13 is a schematic rear view illustrating the state in which the coil electrode and the pinwheel plate of the vacuum interrupter according to the sixth embodiment are combined. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vacuum interrupter according to the present disclosure will now be described with reference to the drawings. In the following description of the embodiments, the same or corresponding parts in the drawings are designated by the same reference characters, and description thereof will not be repeated. In the following description, the "circumferential direction" and the "radial direction" are defined as the direction along the outer edge of the contact portion, and the "radial direction" is defined as the direction from the center of the contact portion toward the outer edge. Kiwo The direction opposite to the "first direction" is sometimes referred to as the "second direction" (counterclockwise direction in Figure 3). Here, when referring to the "inner" and "outer" in the "radial direction," the case where the center of the contact portion is closer to the reference point in the radial direction is described as the "inner" and the case where the center of the contact portion is farther from the reference point in the radial direction is described as the "outer." Furthermore, the movable electrode or the fixed side The direction in which the electrode rods extend is referred to as the “axial direction.” The side closer to the opposing sides of the electrodes is referred to as the front side, and the opposite side, i.e., the side closer to the electrode rods, is referred to as the back side.

[0011] Embodiment 1 The configuration of the vacuum interrupter according to the first embodiment will be briefly described below with reference to Fig. 1 to Fig. 3. Fig. 1 is a schematic cross-sectional view showing the structure of the vacuum interrupter according to the first embodiment. Fig. 2 is an exploded perspective view showing the configuration of the electrode structure of the vacuum interrupter according to the first embodiment. Fig. 3 is a schematic front view showing the electrode structure of the vacuum interrupter according to the first embodiment.

[0012] First, the overall structure of the vacuum interrupter will be briefly explained with reference to FIGS. As shown in Fig. 1, the vacuum valve has a vacuum vessel made of a cylindrical insulating cylinder 1 with a bottom made of an insulating material such as alumina ceramic or glass, a fixed flange 2 that covers the opening at one end of the insulating cylinder 1, and a movable flange 3 that covers the opening at the other end. The fixed flange 2 and the movable flange 3 are made of a metal such as stainless steel.

[0013] The fixed flange 2 and the movable flange 3 are coaxially attached to the end face of the insulating cylinder 1 by vacuum brazing. In the figure, a metallized layer 4 is formed on both ends of the insulating cylinder 1, and the fixed flange 2 and the movable flange 3 are connected to the metallized layer 4. The fixed electrode bar 5 is brazed to the fixed flange 2, and the fixed contact part 8 is connected to the inside of the container. On the other hand, the movable electrode bar 6 is brazed to the movable flange 3 via a bellows 11, and the movable contact part 8 is brazed to the inside of the container. In other words, the fixed electrode bar 5 is fixed to one end of a bottomed cylindrical container (insulating cylinder 1). The movable electrode bar 6 is movably arranged at the other end of the contact part 8. An annular coil electrode 7 is provided at the opposing ends of the fixed electrode bar 5 and the movable electrode bar 6. The contact part 8 is provided on the opposing side of the coil electrode 7. The fixed contact part 8 and the movable contact part 8 are arranged to face each other.

[0014] An umbrella-shaped reinforcing part 9 is provided between the coil electrode 7 and the contact part 8 to reinforce the contact part 8. The reinforcing parts 9 are provided on both the fixed electrode bar 5 and the movable electrode bar 6. The contact part 8 is reinforced by fastening the reinforcing parts 9. A guide part 13 for the movable electrode bar 6 is attached to the movable flange 3. This guide part 13 functions as a bearing to ensure smooth movement of the movable electrode bar 6 on the axis AX.

[0015] A bellows cover 10 is disposed on the upper end of the bellows 11 and is joined by brazing to the movable electrode bar 6. The bellows cover 10 is provided for the purpose of preventing the bellows 11 from being soiled or damaged by an arc that is generated when the current is interrupted.

[0016] The arc shield 12 is disposed so as to surround the periphery of both contact portions 8. This arc shield 12 prevents metal vapor generated between both contact portions 8 from adhering to the inner surface of the insulating cylinder 1 when a current is interrupted.

[0017] An axial magnetic field is generated between both contact portions 8 in the direction along the axis AX of both electrode rods 5, 6 when a current is passed therethrough.

[0018] As shown in FIG. 2, the fixed electrode bar 5 and the movable electrode bar 6 are provided with fitting portions 5a, 6a into which the coil electrode 7 described later is fitted, and the coil electrode 7 is fitted and fixed in place.

[0019] Here, the structure of the coil electrode 7 will be described in detail with reference to Fig. 3 in addition to Fig. 2. As shown in Fig. 3, the coil electrode 7 has a first coil portion 70, a power supply portion 71, a ring portion 75, and a detour portion. The detour portion includes a first arm portion 72, a second arm portion 73, and a second coil portion 74. The multiple detour portions are provided corresponding to the multiple first coil portions 70, respectively. Each of the multiple detour portions connects the first coil portion 70 corresponding to the respective detour portion and the ring portion 75. The coil electrode 7 is fixed concentrically with both electrode rods 5, 6 by ring portions 75. The multiple first coil portions 70 are arranged in the circumferential direction of the coil electrode 7 and spaced apart by slits 76. The power supply portion 71 is provided at one end of each of the multiple first coil portions 70.

[0020] The multiple first coil portions 70 are arranged to be spaced apart from one another in the circumferential direction by slits 76. Note that, although each of the first coil portions 70 is illustrated in Fig. 3 as having an arc shape, each of the first coil portions 70 is not limited to having an arc shape as long as it extends in the circumferential direction.

[0021] The plurality of power supply portions 71 are provided at one end of each of the plurality of first coil portions 70, and are electrically connected to the contact portion 8. The power supply portions 71 have a protruding portion for contacting the contact portion 8.

[0022] The ring portion 75 of the coil electrode 7 is fitted into the fitting portion 5 a of the fixed electrode bar 5 or the fitting portion 6 a of the movable electrode bar 6 .

[0023] A first arm portion 72 is connected to the other end of each first coil portion 70. The first arm portion 72 extends radially inward from the other circumferential end of the first coil portion 70. More specifically, the multiple first arms 72 are provided corresponding to each of the multiple first coil portions 70, and extend radially inward from the other circumferential end of the corresponding first coil portion 70.

[0024] The second arm 73 has one end connected to the ring portion 75. The second arm 73 extends radially outward from the one end to the other end. The ring portion 75 is fixed concentrically with each of the electrode rods 5 and 6.

[0025] The second coil portion 74 has one end connected to the first arm portion 72 and the other end connected to the second arm portion 73. The second coil portion 74 has a region (overlapping region) extending in the circumferential direction between the one end and the other end. In other words, the multiple second arms 73 are provided corresponding to the multiple first arms 72, respectively, are connected to the ring portion 75, and extend radially outward.

[0026] Second coil portion 74 is provided extending in a first circumferential direction (clockwise) from first coil portion 70 toward power supply portion 71. In other words, the multiple second coil portions 74 extend while overlapping in the circumferential direction with respect to a corresponding first coil portion 70 among the multiple first coil portions 70 and power supply portion 71 that faces first coil portion 70 with slit 76 interposed therebetween.

[0027] Here, an example of a method for forming first arm portion 72, second arm portion 73, and second coil portion 74 will be described in detail below. First arm portion 72, second arm portion 73, and second coil portion 74 are formed by providing first notch portion 77 and second notch portion 78 in a member extending in the radial direction between first coil portion 70 and power supply portion 71, and ring portion 75. Here, first notch portion 77 is, for example, an arc-shaped notch provided along ring portion 75. Second notch portion 78 is, for example, an arc-shaped notch provided along power supply portion 71.

[0028] In other words, the first cutout portion 77 is located between the second coil portion 74 and the ring portion 75. to 5 The second cutout portion 78 is formed in an arc shape along the circumferential direction in the first coil portion 70 and the power supply portion 71 between the second coil portion 74 and the first coil portion 70.

[0029] The shapes of the first notch 77 and the second notch 78 are merely examples and are not limited to the above examples. It goes without saying that the above-mentioned forming method is merely an example. As described above, it is sufficient that the second coil portion 74 extends so as to overlap the first coil portion 70 and the power supply portion 71 in the circumferential direction. With this configuration, the second coil portion 74 can generate a vertical magnetic field even in the contact portion region where a vertical magnetic field strength is difficult to generate in the comparative example described later.

[0030] The power supply portion 71 of the coil electrode 7 fixed to the fixed electrode bar 5 is fixed to the fixed contact portion 8. The power supply portion 71 of the coil electrode 7 fixed to the movable electrode bar 6 is fixed to the movable contact portion 8.

[0031] <Comparative Example> In explaining the effect of the coil electrode 7 of the vacuum interrupter according to the present embodiment, a coil electrode 700 of the vacuum interrupter shown in Figures 4 and 5 will be explained as a comparative example. Figures 4 and 5 respectively show an exploded perspective view and a schematic front view showing the configuration of an electrode structure according to the comparative example.

[0032] 4 and 5 has an arm portion 79 extending radially outward from the ring portion 75, and is connected to one end of the first coil portion 70. With this configuration, the axial magnetic field is strengthened in the contact portion region (axial magnetic field generating region) corresponding to region 15, which is the region surrounded by the first coil portion 70 and the arm portion 79.

[0033] As described above, in order to ensure an area having effective magnetic flux density on the surface of the contact portion 8 other than the axial magnetic field generation region, the following measures (1) to (3) can be adopted in comparison with the comparative example. However, each of these measures has the following problems.

[0034] (1) When the diameter of the coil electrode and the contact portion 8 is increased, Increasing the diameter of the coil electrode and the contact portion 8 leads to an increase in the diameter of the entire vacuum valve, which causes a problem of increased costs. (2) In order to increase the current density by reducing the thickness of the coil, This leads to an increase in the resistance of the coil electrode itself, which reduces the electrical conductivity, and also makes it difficult to design the heat dissipation of the switch body, such as a vacuum circuit breaker, to which the vacuum valve is attached. (3) When the magnetic flux density near the center of the contact is increased by using a magnetic material for the reinforcing part, Heat is generated when electricity is applied, and the vacuum valve manufacturing process involves handling before and after chemical processing.

[0035] In the vacuum valve of this embodiment, the coil electrode 7 of embodiment 1 has a first arm portion 72, a second arm portion 73, and a second coil portion 74, so that the axial magnetic field is also strengthened in the area surrounded by the second coil portion 74 and the ring portion 75. As will be described in detail in this embodiment and the following embodiments, it is possible to increase the area having effective magnetic flux density on the surface of contact portion 8 without adopting the above measures (1) to (3).

[0036] A case where the current 14 is supplied from the fixed electrode bar 5 or the movable electrode bar 6 to the coil electrode 7 will be described below. As shown in Fig. 3, the current path of the current 14 supplied from the fixed electrode bar 5 or the movable electrode bar 6 is as follows. That is, the current 14 is supplied to the contact portion 8 via the first arm portion 72, the second coil portion 74, the second arm portion 73, the first coil portion 70, and the power supply portion 71. By forming such a current path, the magnetic field at point 15 surrounded by second arm portion 73 and first coil portion 70 is strengthened due to the right-handed rule, and the magnetic flux density becomes higher. Furthermore, there is an effect that the axial magnetic field is also strengthened radially inside second coil portion 74 due to the current flowing through second coil portion 74.

[0037] 3, the first arm 72, the second arm 73, and the second coil 74 may be arranged parallel to one another, and the first arm 72 may be arranged to extend radially from the center of the coil electrode 7. In this case, the reference line SL1 in the figure is a line extending from the axis O of the coil electrode 7 to the first arm 7. of 2 A line connecting the circumferential center portions can be set. This reference line SL1 is used when defining the positional relationship between the first arm portion 72, the second arm portion 73, and the second coil portion 74 in detail, as will be described later.

[0038] The magnetic field generated by the current flowing through the second coil portion 74 is strong on the reference line SL1 of the slit 76 inside the second coil portion 74, and in particular, the divided second coil portions 74 mutually strengthen their magnetic fields at the intersections 16 of the reference lines SL1 of the slits 76. This has the effect of increasing the magnetic flux density in the contact portions 8 including the intersections 16.

[0039] Furthermore, in order to efficiently increase the area having effective magnetic flux density, the positional relationship between the first coil portion 70, the second coil portion 74, and the power supply portion 71 is important. It is desirable that the second coil portion 74 has a small circumferential overlapping width with the first coil portion 70 and a large circumferential overlapping width with the power supply portion 71. This is because the current flows in the same direction in the first coil portion 70 and the second coil portion 74, and therefore, due to the right-handed helical rule, the magnetic fields in the space between the first coil portion 70 and the second coil portion 74 weaken each other's magnetic fields.

[0040] In the second coil portion 74, if W1 and W2 are the width of the circumferential overlap with the first coil portion 70 and the width of the circumferential overlap with the power supply portion 71, respectively, the second coil portion 74 may be configured so that W2 is greater than W1. This reduces mutual weakening of the magnetic fields, and as a result, the area having effective magnetic flux density can be increased more efficiently. In addition, it is preferable that the second coil portion 74 overlaps the entire circumferential direction of the power supply portion 71. However, taking into consideration processability, the second coil portion 74 may be formed to extend from the power supply portion 71 in a first circumferential direction (corresponding to the clockwise direction in FIG. 3) by more than 0 mm and not more than 5 mm.

[0041] Here, the dimensional relationship between the components of the detour section will be described with reference to Fig. 6. That is, the dimensional relationship between the first arm portion 72, the second arm portion 73, and the second coil portion 74 will be described. In the figure, like Fig. 3, the first arm portion 72 extends radially from the center of the coil electrode 7.

[0042] In describing the first angle α and the second angle β, the line segments L1 to L3 will first be described. The line segment L1 is a line segment that connects the circumferential center of the first arm portion 72 and the center of the coil electrode 7 (i.e., the axis O). The line segment L1 is arranged parallel to the reference line SL1 shown in FIG. 3. Either the reference line SL1 or the line segment L1 may be used, but for convenience of description, the line segment L1 will be used below. The line segment L2 is a line segment that connects the radially inner end point of the second coil portion 74 and the axis O of the coil electrode 7. The line segment L3 is a line segment that connects the end of the power supply portion 71 closer to the first coil portion 70 and the axis O.

[0043] The first angle α is the angle between the line segment L1 (reference line SL1) and the line segment L2. The second angle β is the angle between the line segment L1 (reference line SL1) and the line segment L3. Ideally, it is desirable that the first angle α and the second angle β are equal. However, taking into account manufacturing constraints such as workability and assembly, β-15°≦α≦β+15° It is desirable to keep the range within this range. It goes without saying that the end of each part of the first arm portion 72 may be rounded or tapered.

[0044] According to the present disclosure, the magnetic flux density is increased in the region 15 surrounded by the second arm portion 73 and the first coil portion 70, and a magnetic field generated by the current flowing through the second coil portion 74 acts on the region. The magnetic flux density is also increased in the intersection region 16 on the extension line of the slit 76 due to the above-mentioned action, so that the number of locations where the magnetic flux density is higher increases compared to the comparative example (shown in FIGS. 4 and 5). Therefore, the area having effective magnetic flux density can be increased.

[0045] In addition, the effect of increasing the area having the effective magnetic flux density can also provide the following additional effects: The increase in the area having the effective magnetic flux density can improve the uniformity of the magnetic field distribution. Furthermore, the improvement in the uniformity of the magnetic field distribution can stabilize the interruption performance.

[0046] In addition, the stabilization of the interruption performance makes it possible to interrupt a larger current, which contributes to the increase in the current capacity of vacuum valves. Furthermore, the increase in the area with effective magnetic flux density promotes arc diffusion on the surface of contact portion 8. As a result of this promotion of arc diffusion, thermal damage to the surface of contact portion 8 can be reduced. Furthermore, the reduction in thermal damage during interruption improves the interruption life of the vacuum valve, making it possible to prevent the contact portion 8 from melting even when current is interrupted multiple times. As a result, a vacuum valve with multiple interruption capabilities can be constructed.

[0047] In addition, because the area required for effective magnetic flux density can be secured with a smaller diameter than conventional coil electrodes, the diameter of the coil electrode can be made smaller. Furthermore, as the diameter of the coil electrode is made smaller, the diameters of other parts of the vacuum valve can also be made smaller, which contributes to making the entire vacuum valve smaller in diameter and lighter in weight. Naturally, the smaller diameter and lighter weight of the vacuum valve also reduces manufacturing costs.

[0048] Embodiment 2 The configuration according to the second embodiment will be briefly described below with reference to Fig. 7. Fig. 7 is a schematic front view showing a coil electrode 7A of the vacuum interrupter according to the second embodiment.

[0049] In the coil electrode 7 of the first embodiment, the first arm portion 72, the second arm portion 73, and the second coil portion 74 are configured to be parallel to each other, but as shown in Fig. 7, the coil electrode 7A of this embodiment differs from the coil electrode 7 of the first embodiment in the following respect. That is, the first arm portion 72A and the second arm portion 73A are not parallel to each other, but the second arm portion 73A is disposed at an angle to the first arm portion 72A. Note that the second arm portion 73A and the slit 76 are disposed parallel to each other, as in the first embodiment.

[0050] In the present embodiment, the first arm portion 72A is also A Since the coil electrodes 7 are arranged to extend radially from the center of the coil A A line connecting the axis O and the circumferential center of the first arm portion 72A can be considered as a reference line SL2.

[0051] Here, as in the first embodiment, the current 14 flows from the fixed electrode 5 or the movable electrode 6. Coil electrode 7A7, a current 14 supplied from the fixed electrode bar 5 or the movable electrode bar 6 passes through the first arm portion 72A, the second coil portion 74A, the second arm portion 73A, the first coil portion 70, and the power supply portion 71, and is then supplied to the contact portion 8 via the power supply portion 71. Since the current path is the same as in the first embodiment, the magnetic field in the region 15 surrounded by the second arm portion 73A and the first coil portion 70 is strengthened according to the right-handed rule, and the magnetic flux density can be increased. Furthermore, the current flowing through the second coil portion 74A can generate an axial magnetic field also in the region inside the second coil portion 74A.

[0052] In the first embodiment, since the first arm 72 and the second arm 73 are parallel, the current 14 that has flowed through the first arm 72 flows through the second coil portion 74 in a direction perpendicular to the first arm 72. On the other hand, in the present embodiment, since the first arm 72A and the second arm 73A are not parallel, the current 14 that has flowed through the first arm 72A flows through the second coil portion 74A in a direction perpendicular to the slit 76, not through the first arm 72A. As in the first embodiment, the magnetic field generated by the current flowing through the second coil portion 74A becomes stronger on the extension line of the slit 76 inside the second coil portion 74A. Also, at the intersection 16 on the extension line of the slit 76, the magnetic field is strengthened between the divided second coil portions 74A, and the magnetic flux density is increased. As a result, by positioning second arm 73A so that intersection 16 is located directly above second arm 73A as shown in Figure 7, the magnetic flux density of the vertical magnetic field can be increased even in locations where an axial magnetic field is difficult to generate in the comparative example (shown in Figure 5, etc.).

[0053] As described in the description of the first embodiment, the positional relationship between the second coil portion 74A, the first coil portion 70, and the power supply portion 71 is important in order to efficiently increase the area having the effective magnetic flux density. Therefore, in the present embodiment as well, in order to more efficiently increase the area having the effective magnetic flux density, the positional relationship between the reference line SL2 and the coil electrode 7 AIf the angle made by a line connecting the center of and the end point of second coil portion 74A is α, and the angle made by a line connecting reference line SL2 and the right end of power supply portion 71 is β, then taking into consideration constraints such as workability and assembly, it is desirable to keep the angle within the range of β-15°≦α≦β+15°. It goes without saying that there is no problem with R machining or taper machining of the edges of each part.

[0054] The above describes the vacuum interrupter according to embodiment 2. In addition to the effects of embodiment 1, the vacuum interrupter according to embodiment 2 has the effect of increasing the magnetic flux density in a location where the magnetic field strength is weak, such as on the first arm 72A, by arranging the second arm 73A to cross the first arm 72A.

[0055] In addition, the number of locations where the magnetic flux density is high increases, and the area having effective magnetic flux density is increased, and the uniformity of the magnetic field distribution is further improved, stabilizing the interrupting performance. The stabilization of the interrupting performance makes it possible to interrupt a current larger than that of the first embodiment, which can contribute to further increasing the current of the vacuum valve. The increase in the area having effective magnetic flux density promotes arc diffusion on the surface of the contact portion 8, as in the first embodiment, and further reduces thermal damage to the surface of the contact portion 8, improving the interrupting life and enabling the range of application to be expanded to include multiple interruption specifications, etc.

[0056] In addition, because an area with the required effective magnetic flux density can be secured with a smaller diameter than conventional coil electrodes, the coil electrode diameter can be made smaller. As the coil electrode diameter is made smaller, other parts of the vacuum valve can also be made smaller, so this embodiment also contributes to making the entire vacuum valve smaller and lighter. Naturally, making the vacuum valve smaller and lighter also leads to cost reduction.

[0057] Embodiment 3 The configuration of the vacuum interrupter according to the third embodiment will be briefly described below with reference to Fig. 8. Fig. 8 is a schematic front view showing a coil electrode 7B of the vacuum interrupter according to the third embodiment. In the coil electrode 7A of the second embodiment, the reference line SL2 is set to pass through the circumferential center of the first arm portion 72. On the other hand, the coil electrode 7B according to the present embodiment is different from the above-mentioned embodiment in that the reference line SL3 passes through the circumferential center of the slit 76 and passes through the axis O of the coil electrode 7B. Here, the slits 76 are provided at positions extending radially from the axis O of the coil electrode 7B. In addition, the first arm portion 72B and the second arm portion 73B are provided to extend parallel to the direction in which the slits 76 extend.

[0058] According to this embodiment, not only is the magnetic flux density increased in the region of contact portion 8 corresponding to region 15 surrounded by second arm portion 73B and first coil portion 70, but the magnetic fields generated by the currents flowing through all divided second coil portions 74B reinforce each other at the center of coil electrode 7. This reinforcement of the magnetic fields significantly improves the magnetic flux density on the surface of contact portion 8 in the central portion of coil electrode 7. The maximum magnetic flux density on the surface of contact portion 8 can be improved compared to the coil electrodes 7 and 7A according to the above-mentioned embodiments.

[0059] In this embodiment, the number of locations where the magnetic flux density is high can also be increased, and in addition to increasing the area with effective magnetic flux density, the uniformity of the magnetic field distribution can be improved, and the interruption performance can be stabilized. The stabilization of the interruption performance makes it possible to interrupt a larger current, which can contribute to further increasing the current of vacuum valves. As the area with effective magnetic flux density is increased, arc diffusion on the surface of the contact portion 8 is promoted as in the first and second embodiments, and thermal damage to the surface of the contact portion 8 is further reduced, improving the interruption life and enabling the range of application to be expanded to multiple interruption specifications, etc.

[0060] In addition, since an area having an effective magnetic flux density required can be secured with a smaller diameter than the conventional coil electrode, the diameter of the coil electrode can be reduced. As the diameter of the coil electrode is reduced, other parts of the vacuum valve can also be reduced in diameter, and this embodiment can also contribute to reducing the diameter and weight of the entire vacuum valve. Naturally, the realization of a smaller diameter and lighter vacuum valve also leads to cost reduction. An effect different from the above-mentioned embodiments 1 and 2 is an expansion of the range of application to high voltage specifications. In general, when used under high voltage, it is necessary to increase the distance between both contact parts 8 (contact distance) in order to reduce the electric field, but the longer the contact distance, the lower the magnetic flux density on the contact surface tends to be. By increasing the magnetic flux density using this embodiment, an area having an effective magnetic flux density can be secured even when the contact distance is increased, and it becomes possible to satisfy the interruption performance.

[0061] The above describes the vacuum interrupter according to embodiment 3. In addition to the effects of embodiments 1 and 2, the vacuum interrupter according to embodiment 3 has the effect of significantly increasing the magnetic flux density of the contact portion 8 in the region corresponding to the central portion of the coil electrode 7B.

[0062] Embodiment 4 The configuration of the vacuum interrupter according to the fourth embodiment will be briefly described below with reference to Figs. 9 to 12. Fig. 9 is a front schematic view showing a coil electrode 7C according to the fourth embodiment. Fig. 10 is a schematic cross-sectional view showing the structure of the vacuum interrupter according to the fourth embodiment. Fig. 11 is a front schematic view showing the structure of a coil electrode 7D (first modified example) according to the fourth embodiment. Fig. 12 is a front schematic view showing the structure of a coil electrode 7E (second modified example) according to the fourth embodiment.

[0063] 9, the coil electrode 7C according to the present embodiment differs from the above-described embodiments in that it is provided with an arc-shaped heat dissipation portion 80 that extends circumferentially from an end of the second coil portion 74. In other words, the heat dissipation portion 80 is provided extending in a second circumferential direction (counterclockwise) from one end of the second coil portion 74 on the side closer to the first coil portion 70 through the first notched portion 77.

[0064] The heat dissipation section 80 can dissipate heat that is generated when electricity is applied to the first arm section 72, the second coil section 74, and the second arm section 73. This can reduce the temperature rise of the first arm section 72, the second coil section 74, and the second arm section 73, and the coil electrode 7 C The electrical conductivity of the battery can be improved.

[0065] 1, because there is a gap 17 on the back surface of the coil electrode 7, under high voltage, equipotential lines penetrate into the gap 17, and the boundary electric field on the back surface of the coil electrode 7 becomes stronger. On the other hand, by using the coil electrode 7C provided with the heat dissipation section 80 of this embodiment, the size of the cavity on the back surface of the coil electrode 7C becomes smaller as shown in FIG. 10, and equipotential lines become less likely to penetrate. Accordingly, the boundary electric field on the back surface of the coil electrode 7C can be relaxed, and the withstand voltage performance can be improved.

[0066] As shown in Fig. 11, the coil electrode 7D may further include an arc-shaped heat dissipation portion 80 in the coil electrode 7A. As shown in Fig. 12, the coil electrode 7E may further include an arc-shaped heat dissipation portion 80 in the coil electrode 7B. The heat dissipation portion 80 dissipates heat generated in the coil electrode 7A etc. Note that the coil electrode is not limited to the above, and the coil electrode of any embodiment of the present disclosure may be used. By providing the heat dissipation section 80 on the coil electrode 7A etc., the following can be achieved. That is, in addition to the effects of the second and third embodiments, heat generated by energizing the first arm portion 72, the second coil portion 74, and the second arm portion 73 is dissipated in the heat dissipation section 80. Note that, since only a small amount of current is supplied to the heat dissipation section 80, the amount of heat dissipated by the heat dissipation section 80 is greater than the amount of heat generated in the heat dissipation section 80, and this makes it possible to suppress a rise in temperature of the coil electrode 7A. This makes it possible to improve the current carrying performance of the vacuum interrupter. Furthermore, by providing the heat dissipation section 80, the boundary electric field on the back surface of the coil electrode 7A can be alleviated, and the voltage resistance performance of the vacuum interrupter can be improved.

[0067] The above describes the vacuum interrupter according to embodiment 4. In addition to the effects of the above-mentioned embodiments, the vacuum interrupter according to embodiment 4 achieves the effect of improving the heat dissipation properties, current conduction performance, and the like, as described above.

[0068] Embodiment 5. The configuration of the vacuum interrupter according to the fifth embodiment will be briefly described below with reference to Figs. 13 to 19. Fig. 13 is a schematic cross-sectional view showing the structure of the vacuum interrupter according to the fifth embodiment. Fig. 14 is an exploded perspective view showing the configuration of the electrode structure of the vacuum interrupter according to the fifth embodiment. Fig. 15 is a schematic front view of the coil electrode of the vacuum interrupter according to the fifth embodiment. Fig. 16 is a schematic side view of the electrode structure of the vacuum interrupter according to the fifth embodiment. Fig. 17 is a schematic rear view of the coil electrode of the vacuum interrupter according to the fifth embodiment. Fig. 18 is a schematic rear view of the windmill plate 18 of the vacuum interrupter according to the fifth embodiment. Fig. 19 is an explanatory diagram explaining the state in which the windmill plate 18 and the coil electrode 7A of the vacuum interrupter according to the fifth embodiment are combined.

[0069] 13 and 14, the vacuum interrupter according to this embodiment differs from the above-described embodiments in that it has a windmill plate 18 (shown in Figs. 13, 14, etc.) provided on the back side of the coil electrode 7A. As will be described in detail later, providing the windmill plate 18 allows leakage current to flow on the back side of the power supply unit 71, thereby improving the axial magnetic field strength around the power supply unit 71.

[0070] The basic structure of the coil electrode in this embodiment may be applied to any of the coil electrodes 7, 7A, 7B, 7C, 7D and 7E of the above-mentioned embodiments, but for convenience the following description will be given using the coil electrode 7A of embodiment 2.

[0071] 15 and 16, the leakage current 19 (corresponding to the dashed arrow in the figure) flowing through the windmill plate 18 will be described. As described above, the current 14 supplied from the fixed electrode bar 5 or the movable electrode bar 6 flows through the first arm portion 72A, the second coil portion 74A, the second arm portion 73A, the first coil portion 74A, the second arm portion 75A, the first coil portion 76A, the first coil portion 77A, the second coil portion 78A, the first coil portion 79A, the second coil portion 80A, the first coil portion 81A, the first coil portion 82A, the first coil portion 83A, the first coil portion 84A, the second coil portion 85A, the first coil portion 86A, the first coil portion 87A, the first coil portion 88A, the first coil portion 89A, the first coil portion 90A, the first coil portion 91 0、 The current passes through power supply portion 71 and is supplied to contact portion 8. A part of current 14 (solid arrow) flowing through first arm portion 72A branches off as leakage current 19 (dashed arrow) to windmill plate 18 on the rear side. The leakage current 19 flows from the portion corresponding to the first arm portion 72A of the windmill plate 18 to the portion corresponding to the power supply portion 71 of the windmill plate 18, and then merges into the first coil portion 70 facing each other with the slit 76 interposed therebetween. As a result, the leakage current 19 flows on the back side of the power supply portion 71, generating an axial magnetic field in the power supply portion 71. As described above, current is supplied from the fixed-side electrode bar 5 or the movable-side electrode bar 6 to the coil electrode 7A and the windmill plate 18.

[0072] Here, the board attachment of the windmill 18 and the coil electrode 7A will be specifically described. As shown in FIG. 16, a shallow groove 81 and a deep groove 82 are formed on the back surface of the coil electrode 7A. Here, when the depth of the shallow groove 81 in the axial direction is e and the depth of the deep groove 82 in the axial direction is f, as described above, it is configured such that the relationship e < f holds. From the above relationship, the upper surface of the windmill plate 18 is in contact with the back surface of the first coil portion 70 where the shallow groove 81 is formed. On the other hand, the upper surface of the windmill plate 18 is not in contact with the back surface of the power supply portion 71 where the deep groove 82 is formed.

[0073] Since the path of the current 14 is the same as that in the second embodiment, the magnetic flux density of the axial magnetic field is increased at the same locations as in the second embodiment according to the right-hand screw rule. In addition to the above-described embodiment, an axial magnetic field is generated in the power supply portion 71 due to the flow of the leakage current 19 as described above. That is, the leakage current 19 flows through the windmill plate 18.

[0074] The range where the shallow groove 81 is formed is, as shown in FIG. 17, the ring portion 75, the first arm portion 72A, the second coil portion 74 A , and the second arm portion 73 A , and in addition, from the end face of the slit 76 in the first coil portion 70 to the second arm portion 73 AThe deep groove 82 extends from the power supply portion 71 to the second coil portion 74. A The shallow groove 81 is formed so as to have the same depth in the axial direction of both electrodes 5 and 6. The deep groove 82 is also formed so as to have the same depth in the axial direction of both electrodes 5 and 6.

[0075] FIG. 18 shows the windmill plate 18 corresponding to FIG. 17. The windmill plate 18 has a plurality of arc-shaped members arranged radially in the circumferential direction. The windmill plate 18 is connected to both electrode bars 5 and 6 by windmill fitting portions 18a. The arc-shaped members are provided with windmill cutouts 18b along the circumferential direction at the windmill fitting portions 18a. The windmill cutouts 18b are formed in each of the plurality of arc-shaped members, thereby forming the windmill plate 18 having the windmill fitting portion 18a, the windmill arm portion 18c, and the windmill coil portion 18d. The windmill plate 18 has the windmill fitting portion 18a that fits with the fitting portions 5a, 6a of the fixed electrode bar 5 or the movable electrode bar 6. The fixed electrode bar 5 or the movable electrode bar 6 is fitted with a windmill fitting portion 18a (FIG. 18) and a ring portion 6a (FIG. 14). 75 7) are fitted together, whereby the coil electrode 7A and the windmill plate 18 are attached to the fixed electrode bar 5 or the movable electrode bar 6. As a result, the windmill plate 18 is fixed and attached to the back surface of the coil electrode 7A, as shown in FIG. A shallow groove 81 is formed on the back side of the coil electrode 7A. The shallow groove 81 is formed in the first coil portion 7 0、 The wind turbine coil portion 18d is disposed on the rear side of the second arm portion 73A and the second coil portion 74A, with a connection surface being disposed in the shallow groove 81 of the coil electrode 7A.

[0076] The dimensional setting of each cutout (first cutout 77, second cutout 78, and wind turbine cutout 18b) will be described in detail with reference to Figures 17 and 18. In Figure 17, φb indicates the outer diameter of first cutout 77, and φc indicates the inner diameter of second cutout 78. In Figure 18, φd indicates the outer diameter of wind turbine cutout 18b. Here, it is desirable to set the dimensions so that the relationship φb ≦ φd < φc holds. By this dimension setting, the radial width of the windmill coil portion 18d of the windmill plate 18 can be ensured, and a configuration in which the leakage current described later easily flows can be achieved.

[0077] The deep groove 82 is formed to extend from one end on the slit 76 side of the power supply portion 71 to the other end, and extends circumferentially by a dimension a from the other end of the power supply portion 71 to the second coil portion 74A. twist Here, the depth of the deep groove 82 in the axial direction is uniform. Here, it is desirable that the relationship 0 < a ≦ 5 holds for the dimension a (mm). By increasing the circumferential overlap between the windmill coil portion 18d of the windmill plate 18 and the second coil portion 74A, the longitudinal magnetic field around the power supply portion 71 can be strengthened. Note that the directions of the currents flowing through the windmill coil portion 18d of the windmill plate 18 and the second coil 4A are opposite, and thus the axial magnetic fields strengthen each other according to the right-hand screw rule. Part 7 The directions of the currents flowing through the windmill coil portion 18d of the windmill plate 18 and the second coil 4A are opposite, and thus the axial magnetic fields strengthen each other according to the right-hand screw rule.

[0078] Returning to FIG. 16, the dimension setting for relaxing the boundary electric field on the back surface of the coil electrode 7A will be described. In this configuration, assuming that the axial thickness of the windmill plate 18 is t, it is desirable to make the depth e of the shallow groove 81 equal to the thickness t of the windmill plate 18 (e = t) in consideration of the boundary electric field on the back surface of the coil electrode 7A. On the other hand, when prioritizing the energization performance between the windmill plate 18 and the coil electrode 7A, the depth e of the shallow groove 81 may be set to be less than or equal to the thickness t of the windmill plate 18 (e ≦ t). Also, although the outer diameter of the windmill plate 18 is basically the same as the outer diameter of the coil electrode 7A, in consideration of the electric field design, it is desirable to make the shape match the outer peripheral shape of the coil electrode 7A as appropriate, such as adding R processing or a taper to the end portion.

[0079] As described above, the vacuum valve according to Embodiment 5 has been described. The vacuum valve according to Embodiment 5 has an effect of increasing the longitudinal magnetic field around the power supply portion 71 due to the leakage current flowing on the back side of the power supply portion 71 in addition to the effects of Embodiment 1.

[0080] Embodiment 6. Hereinafter, the configuration of the vacuum valve according to Embodiment 6 will be briefly described with reference to FIGS. 20 to 23. In this embodiment, the shapes of the shallow groove 81 and the deep groove 82 are different from those of the vacuum valve according to Embodiment 5.

[0081] FIG. 20 is an explanatory diagram for explaining a state in which the coil electrode 7A and the windmill plate 18 of the vacuum valve according to Embodiment 6 are combined. FIG. 21 is a schematic rear view of the windmill plate 18 according to Embodiment 6. FIG. 22 is a schematic front view for explaining the flow of current in the coil electrode of the vacuum valve according to Embodiment 6. FIG. 23 is a schematic rear view for explaining a state in which the coil electrode and the windmill plate 18 of the vacuum valve according to Embodiment 6 are combined.

[0082] In FIG. 20, similar to Embodiment 5, the deep groove 82 is formed to extend from one end on the slit 76 side of the power supply portion 71 to the other end, and the other end of the power supply portion 71 from Second coil Part 7 4 twist It may be formed to extend in the circumferential direction by a dimension a (it is desirable that 0 < a ≤ 5 in terms of the dimension a (mm)).

[0083] Here, in FIGS. 20 and 21, let the outer diameters of the shallow groove 81 and the deep groove 82 formed in the coil electrode 7A be φg and φh, respectively. Also, let the outer diameter of the windmill plate 18 be φi and the outer diameter of the coil electrode 7A be φj. The vacuum valve according to this embodiment has the following dimensional settings different from those of the vacuum valve according to Embodiment 5. That is, the dimensional setting is different in that φg < φh < φj and φg = φi are satisfied. In other words, the outer diameter φh of the deep groove 82 is larger than the outer diameter φg of the shallow groove 81 and smaller than the outer diameter φj of the coil electrode 7A. Note that the coil electrode 7A (FIG. 20) and the windmill plate 18 (FIG. 21) are combined to form the configuration shown in FIG. 23. Due to the above-described dimensional setting, the area exposed from the side surface of the coil electrode 7A is reduced by the windmill plate 18, so that a decrease in the boundary electric field in the coil electrode 7A can be suppressed.

[0084] As shown in FIG. 22, also in this embodiment, similar to Embodiment 5, the longitudinal magnetic field intensity around the power supply portion 71 is increased by the configuration in which the leakage current 19 flows.

[0085] The coil electrode 7A of the wind mill plate 18 in the fifth embodiment has an exposed portion from the side (FIG. 16). On the other hand, in the present embodiment, the dimensions of the wind mill plate 18 and the coil electrode 7A are set so as to reduce the area of ​​the exposed portion of the wind mill plate 18. This makes it possible to reduce the gap between the coil electrode 7A and the wind mill plate 18, and as a result, it is possible to suppress a decrease in the boundary electric field on the side surface of the coil electrode 7A.

[0086] The above describes the vacuum interrupter according to embodiment 6. In addition to the effects of embodiment 5, the vacuum interrupter according to embodiment 6 has the effect of reducing the area exposed from the side surface of the coil electrode 7A by using the windmill plate 18, thereby reducing the gap between the coil electrode 7A and the windmill plate 18.

[0087] In the above embodiment, the coil electrode is divided into three parts, but the number of parts is not limited to three, and the number of parts may be two, four or more. Although a plurality of detour parts are provided corresponding to the plurality of first coil parts, at least one detour part may be arranged corresponding to the first coil part.

[0088] In addition, in the above-described embodiments, it is possible to combine the respective embodiments, and it is possible to modify or omit the respective embodiments as appropriate. [Explanation of symbols]

[0089] 1 Insulating cylinder 5 Fixed side electrode rod 6 Movable electrode rod 5a, 6a mating part 7, 7A, 7B, 7C, 7D coil electrode 8 Contact part 18 Windmill board 18a Windmill fitting part 18b Windmill cutout 18c windmill arm 18d Windmill coil section 70, 70A 70B, 70C, 70D First coil section 71 Power supply unit 72, 72A, 72B First arm 73, 73A, 73B second arm 74, 74A, 74B Second coil section 75 Ring section 76 Slit 77 First cutout 78 Second notch 80 Heat radiation part 81 Shallow Groove 82 deep groove

Claims

1. A vacuum valve comprising: a fixed electrode bar fixed to one end of a bottomed cylindrical container; a movable electrode bar movably provided at the other end of the container; coil electrodes provided at opposing ends of both the movable electrode bar and the fixed electrode bar, which generate a magnetic field in an axial direction along the axis of both electrodes when a current is applied; and contact portions provided on the opposing sides of the coil electrodes, The coil electrode is a ring portion fixed concentrically to each of the electrodes; A plurality of first coil portions arranged in a circumferential direction of the coil electrode and spaced apart by slits; a plurality of power supply units provided at one end of each of the plurality of first coil units; at least one detour portion provided corresponding to at least one of the plurality of first coil portions and connecting the corresponding first coil portion and the ring portion; The at least one detour portion is a second coil portion extending in the circumferential direction and overlapping the corresponding first coil portion and the power supply portion facing the first coil portion; a first arm portion connecting the second coil portion and the ring portion; a second arm portion connecting the second coil portion and the first coil portion; having A first cutout portion is formed between the second coil portion and the ring portion, the first cutout portion being provided to extend in the circumferential direction along the ring portion, a second cutout portion is formed between the second coil portion and the first coil portion, the second cutout portion being provided to extend in the circumferential direction along the first coil portion and the opposing power supply portion; The coil electrode has a heat dissipation portion that extends in the circumferential direction from one end of the second coil portion closer to the first coil portion through the first notch.

2. A vacuum valve comprising: a fixed electrode bar fixed to one end of a bottomed cylindrical container; a movable electrode bar movably provided at the other end of the container; coil electrodes provided at opposing ends of both the movable electrode bar and the fixed electrode bar, which generate a magnetic field in an axial direction along the axis of both electrodes when a current is applied; and contact portions provided on the opposing sides of the coil electrodes, The coil electrode is a ring portion fixed concentrically to each of the electrodes; A plurality of first coil sections arranged in a circumferential direction of the coil electrode and spaced apart by slits, and a plurality of power supply sections provided at one end of each of the plurality of first coil sections; at least one detour portion provided corresponding to at least one of the plurality of first coil portions and connecting the corresponding first coil portion and the ring portion; The at least one detour portion is a second coil portion extending in the circumferential direction and overlapping the corresponding first coil portion and the power supply portion facing the first coil portion; a first arm portion connecting the second coil portion and the ring portion; a second arm portion connecting the second coil portion and the first coil portion; having The coil electrode further includes a windmill plate disposed on a rear side thereof, A shallow groove and a deep groove that is deeper than the shallow groove are formed on the rear side of the coil electrode, the shallow groove is formed in the ring portion, the first arm portion, the second coil portion, the second arm portion, and a range from an end face of the slit in the first coil portion to an extension line of the second arm portion, the deep groove is formed in a range from the power supply portion to the second coil portion, The vacuum valve is characterized in that the windmill plate is attached to the shallow groove and the deep groove so that leakage current occurs from the portion corresponding to the power supply unit to the first coil portion facing across the slit, and so that the windmill plate does not come into contact with the back side of the power supply unit in which the deep groove is formed.

3. A first cutout portion is formed between the second coil portion and the ring portion, the first cutout portion being provided to extend in the circumferential direction along the ring portion, a second cutout portion is formed between the second coil portion and the first coil portion, the second cutout portion being provided to extend in the circumferential direction along the first coil portion and the opposing power supply portion; the windmill plate includes a plurality of arc-shaped members arranged radially in the circumferential direction and a windmill fitting portion that fixes the plurality of arc-shaped members to the axis of both the electrode rods, The arc-shaped member has an arc-shaped wind turbine cutout portion provided along the circumferential direction at the wind turbine fitting portion, When the outer diameter of the first notch is φb, the inner diameter of the second notch is φc, and the outer diameter of the wind turbine notch is φd, 3. The vacuum valve according to claim 2, wherein the relationship φb≦φd<φc is satisfied.

4. When the depth of the shallow groove in the coil electrode in the axial direction is e and the thickness of the windmill plate in the axial direction is t, 4. A vacuum valve according to claim 2 or 3, wherein the relationship e≦t holds.

5. 5. A vacuum valve as claimed in any one of claims 2 to 4, wherein the deep groove is formed so that its outer diameter φh is larger than the outer diameter φg of the shallow groove and smaller than the outer diameter φj of the coil electrode.

6. When the outer diameter of the shallow groove is φg, the outer diameter of the deep groove is φh, the outer diameter of the windmill plate is φi, and the outer diameter of the coil electrode is φj, 6. A vacuum valve according to claim 2, wherein the relationships φg<φh<φj and φg=φi are satisfied.

7. A vacuum valve as described in any one of claims 2 to 6, wherein the depth of the deep groove in the axial direction is formed to be uniform in a region from the power supply portion to a position circumferentially away from the second coil portion by a dimension a.

8. 8. The vacuum valve according to claim 7, wherein the dimension a is greater than 0 mm and equal to or less than 5 mm.

9. In the second coil portion, when W1 and W2 are respectively a width of the second coil portion overlapping the first coil portion in the circumferential direction and a width of the second coil portion overlapping the power supply portion in the circumferential direction, W1 < W2 9. The vacuum valve according to claim 1, wherein the following holds true:

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