Vacuum valve

Abstract

To maintain a movable contact in a correct position and improve the shut-off performance of a vacuum valve by suppressing the tilt of a movable electrode rod.SOLUTION: A vacuum valve has an insulated container 1 with fixed-side metal end plates 5 and movable-side metal end plates 10 fixed at both ends, a fixed-side electrode rod 4 fixed to the fixed-side metal end plate 5, a movable-side electrode rod 7 movably provided on the movable-side metal end plate 10 via bellows 9 and a bellows cover 8, a fixed-side contact 3 provided at the end of the fixed-side electrode rod 4, and a movable-side contact 6 provided at the end of the movable-side electrode rod 7. A groove 7a is provided for fitting a guide 11D extending axially along the movable-side electrode rod 7, and the movable-side electrode rod 7 is mounted such that its side surface in the groove 7a follows the inner side surface of the guide 11D.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to vacuum valves. [Background technology]

[0002] Vacuum interrupters mounted in vacuum circuit breakers, vacuum switchgears, etc. generally consist of an insulating container, a shield, a fixed contact, a fixed electrode rod, a fixed metal end plate, a moving contact, a moving electrode rod, a bellows cover, a bellows, a moving metal end plate, and a guide. The guide serves to support the moving electrode rod and prevent it from tilting. In the vacuum interrupter shown in Patent Document 1 below, a resin guide is fitted into the gap between the moving electrode rod and the moving metal end plate to prevent the moving electrode rod from tilting when the vacuum interrupter is mechanically opened or closed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 9-320412 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional vacuum interrupters, as shown in Patent Document 1, a guide is fitted into the gap between the movable electrode rod and the movable metal end plate to prevent the movable electrode rod from tilting when the vacuum interrupter is mechanically opened or closed. However, in the vacuum interrupter shown in Patent Document 1, the guide can only support the movable electrode rod within the bellows (up to the end face of the bellows cover). This causes the movable electrode rod to tilt significantly, which causes the movable contact to be unable to be kept in the correct position.

[0005] The present disclosure discloses a technology for solving the above-mentioned problems, and aims to improve the interrupting performance of the vacuum valve by suppressing the tilt of the movable electrode rod, thereby keeping the movable contact in the correct position. [Means for solving the problem]

[0006] The vacuum valve of the present disclosure comprises an insulating container having a fixed metal end plate and a movable metal end plate fixed to both ends, a fixed electrode rod fixed to the fixed metal end plate, a movable electrode rod movably attached to the movable metal end plate via a bellows and a bellows cover, a fixed contact provided at the end of the fixed electrode rod, and a movable contact provided at the end of the movable electrode rod, The movable electrode bar is provided with a groove for fitting a guide extending in the axial direction, and the movable electrode bar is attached so that the side surface of the groove and the inner side surface of the guide fit together. [Effects of the Invention]

[0007] According to the vacuum interrupter of the present disclosure, by suppressing tilting of the movable electrode rod, the movable contact can be maintained in the correct position, thereby improving the interruption performance of the vacuum interrupter. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing a vacuum interrupter according to a first embodiment. [Figure 2] FIG. 2A is a perspective view showing a movable electrode rod according to the first embodiment, and FIG. 2B is a cross-sectional view showing a movable electrode rod according to the first embodiment. [Figure 3] 1 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to embodiment 1. FIG. [Figure 4] 1 is a cross-sectional view showing a vacuum interrupter according to a first embodiment. [Figure 5] FIG. 5A is a perspective view showing a movable electrode rod according to the second embodiment, and FIG. 5B is a cross-sectional view showing a movable electrode rod according to the second embodiment. [Figure 6] FIG. 10 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to a second embodiment. [Figure 7]FIG. 7A is a perspective view showing a movable electrode rod according to the third embodiment, and FIG. 7B is a cross-sectional view showing a movable electrode rod according to the third embodiment. [Figure 8] FIG. 8A is a perspective view showing a bellows cover according to a third embodiment, and FIG. 8B is a cross-sectional view showing the bellows cover according to the third embodiment. [Figure 9] FIG. 11 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to a third embodiment. [Figure 10] FIG. 10A is a perspective view showing a movable electrode rod according to the fourth embodiment, and FIG. 10B is a cross-sectional view showing the movable electrode rod according to the fourth embodiment. [Figure 11] FIG. 11A is a perspective view showing a guide portion according to the fourth embodiment, and FIG. 11B is a cross-sectional view showing the guide portion according to the fourth embodiment. [Figure 12] FIG. 10 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to a fourth embodiment. [Figure 13] FIG. 13A is a perspective view showing a movable electrode rod according to the fifth embodiment, and FIG. 13B is a cross-sectional view showing a movable electrode rod according to the fifth embodiment. [Figure 14] 14A is a perspective view showing a guide portion according to the fifth embodiment, and FIG. 14B is a cross-sectional view showing the guide portion according to the fifth embodiment. [Figure 15] FIG. 10 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to a fifth embodiment. [Figure 16] 16A is a perspective view showing a movable electrode rod according to the sixth embodiment, and FIG. 16B is a cross-sectional view showing a movable electrode rod according to the sixth embodiment. [Figure 17] 17A is a perspective view showing a guide portion according to the sixth embodiment, and FIG. 17B is a cross-sectional view showing the guide portion according to the sixth embodiment. [Figure 18] FIG. 13 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to a sixth embodiment. [Figure 19] FIG. 19A is a perspective view showing a movable electrode rod according to the seventh embodiment, and FIG. 19B is a cross-sectional view showing a movable electrode rod according to the seventh embodiment. [Figure 20]FIG. 20A is a perspective view showing a guide portion according to the seventh embodiment, and FIG. 20B is a cross-sectional view showing the guide portion according to the seventh embodiment. [Figure 21] FIG. 13 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to a seventh embodiment. [Figure 22] 22A is a perspective view showing a movable electrode rod according to the eighth embodiment, and FIG. 22B is a cross-sectional view showing a movable electrode rod according to the eighth embodiment. [Figure 23] 23A is a perspective view showing a guide portion according to the eighth embodiment, and FIG. 23B is a cross-sectional view showing the guide portion according to the eighth embodiment. [Figure 24] FIG. 13 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to an eighth embodiment. [Figure 25] 25A is a perspective view showing a movable electrode rod according to the ninth embodiment, and FIG. 25B is a cross-sectional view showing the movable electrode rod according to the ninth embodiment. [Figure 26] 26A is a perspective view showing a guide portion according to the ninth embodiment, and FIG. 26B is a cross-sectional view showing the guide portion according to the ninth embodiment. [Figure 27] FIG. 13 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to a ninth embodiment. [Figure 28] 28A is a perspective view showing a movable electrode rod according to the tenth embodiment, and FIG. 28B is a cross-sectional view showing a movable electrode rod according to the tenth embodiment. [Figure 29] 29A is a perspective view showing a guide portion according to the tenth embodiment, and FIG. 29B is a cross-sectional view showing the guide portion according to the tenth embodiment. [Figure 30] FIG. 23 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to a tenth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Embodiment 1 A vacuum interrupter according to a first embodiment will be described below with reference to the drawings. Fig. 1 is a cross-sectional view of a vacuum interrupter according to embodiment 1, showing the open state. Fig. 2A is a perspective view of a movable electrode rod according to embodiment 1, Fig. 2B is a cross-sectional view of a movable electrode rod according to embodiment 1, and Fig. 3 is a cross-sectional view of a movable assembly in the vacuum interrupter according to embodiment 1. Furthermore, Fig. 4 is a cross-sectional view of the vacuum interrupter according to embodiment 1, showing the closed state. As shown in Figure 1, the vacuum interrupter according to embodiment 1 is composed of an insulating container 1, a shield 2, a fixed contact 3, a fixed electrode rod 4, a fixed metal end plate 5, a movable contact 6, a movable electrode rod 7, a bellows cover 8, a bellows 9, a movable metal end plate 10, and a guide 11. A fixed metal end plate 5 and a movable metal end plate 10 are fixed to both ends of the insulating container 1. The fixed electrode rod 4 is fixed to the fixed metal end plate 5, and the movable electrode rod 7 is movably mounted relative to the movable metal end plate 10 via a bellows 9 and a bellows cover 8. The fixed contact 3 is provided at the end of the fixed electrode rod 4, and the movable contact 6 is provided at the end of the movable electrode rod 7. In this embodiment, a guide portion 11 for preventing the movable electrode rod 7 from tilting is attached to the movable metal end plate 10, and the guide portion 11 is composed of a guide 11D extending in the axial direction of the vacuum interrupter and an end plate portion 11E provided at the end of the guide portion 11.

[0010] As shown in Figures 2A and 2B, the movable electrode rod 7 is made of a metal with high electrical conductivity (e.g., copper) and has a groove 7a for fitting the guide 11D. The radial width of the groove 7a in the movable electrode rod 7 is greater than or equal to the width of the guide 11D. Furthermore, the depth of the groove 7a is set so that the end face of the guide 11D does not interfere when the vacuum interrupter contacts are opened. When comparing Figures 1 and 4, the dimensional relationship is set so that X≦Y holds. In other words, the distance between the fixed contact 3 and the movable contact 6 in the open state is set to be less than the distance between the end face of the guide 11D and the bottom of the groove 7a in the closed state. This ensures reliable contact between the fixed contact 3 and the movable contact 6 in the closed state.

[0011] As described above, the vacuum interrupter according to the first embodiment uses a movable electrode bar 7 provided with a groove 7a into which the guide 11D is fitted. The guide 11D is fitted into the groove 7a provided in the movable electrode bar 7, and is attached and positioned so that the side surface 7b of the groove 7a in the movable electrode bar 7 and the inner side surface 11a of the guide 11D are aligned.

[0012] By shaping the movable electrode rod 7 as described above, the distance over which the movable electrode rod 7 can be supported by the guide 11D is increased, preventing tilting of the movable electrode rod 7. Furthermore, preventing tilting of the movable electrode rod 7 allows the movable contact 6 to be maintained in the correct position. This improves the interrupting performance of the vacuum interrupter and also prevents lateral displacement of the movable contact 6 during short-time withstand current testing and short-circuiting. A short-time withstand current test is an evaluation test for vacuum circuit breakers in which a current equivalent to the rated interrupting current is passed through the contacts in a closed state for a specified period of time. Passing current through a vacuum circuit breaker generates an electromagnetic force, which causes lateral displacement of the movable contact in a vacuum interrupter. However, by inserting the guide 11D deep into the movable electrode rod 7, lateral displacement (tilt) can be prevented.

[0013] Embodiment 2 5A is a perspective view showing a movable side electrode rod according to embodiment 2, FIG. 5B is a cross-sectional view showing a movable side electrode rod according to embodiment 2, and FIG. 6 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to embodiment 2. 5A and 5B, the movable electrode rod 7 is made of a metal with high electrical conductivity (e.g., copper) as its base material, and is provided with a groove 7a into which the guide 11D is fitted. The groove 7a provided in the movable electrode rod 7 is larger than or equal to the width of the guide 11D. The depth of the groove 7a is determined so that it does not interfere with the end face of the guide 11D when the contacts of the vacuum interrupter are opened.

[0014] Furthermore, a protrusion 7c for fitting the bellows cover 8 and bellows 9 is provided on the outer periphery of the groove 7a provided in the movable electrode bar 7. The protrusion 7c provided on the movable electrode bar 7 is provided circumferentially along the groove 7a, and the outer diameter of the circumference formed by the protrusion 7c is smaller than or equal to the inner diameter of the bellows cover 8 and bellows 9. The height of the protrusion 7c is larger than or equal to the sum of the thicknesses of the bellows cover 8 and bellows 9.

[0015] As described above, the vacuum interrupter according to this embodiment uses a movable electrode bar 7 provided with a groove 7a for fitting the guide 11D and a protrusion 7c for fitting the bellows cover 8 and bellows 9. The guide 11D is fitted into the groove 7a provided in the movable electrode bar 7, and is attached so that the side surface 7b of the groove 7a in the movable electrode bar 7 and the inner side surface 11a of the guide 11D are aligned. Furthermore, the bellows cover 8 and bellows 9 are joined and arranged so that they fit into the protrusion 7c provided on the movable electrode bar 7.

[0016] By shaping the movable electrode 7 as described above, the distance over which the movable electrode 7 can be supported by the guide 11D is increased, and tilting of the movable electrode 7 can be suppressed. Furthermore, by suppressing tilting of the movable electrode 7, the movable contact 6 can be kept in the correct position. This improves the interruption performance of the vacuum interrupter, and also suppresses lateral displacement of the movable contact 6 during short-time withstand current tests and when short-circuiting. Furthermore, it is easy to position the movable electrode 7, bellows cover 8, and bellows 9, improving the assembly performance of the vacuum interrupter.

[0017] Embodiment 3 FIG. 7A is a perspective view of a movable-side electrode rod according to embodiment 3, FIG. 7B is a cross-sectional view of the movable-side electrode rod according to embodiment 3, FIG. 8A is a perspective view of a bellows cover according to embodiment 3, FIG. 8B is a cross-sectional view of the bellows cover according to embodiment 3, and FIG. 9 is a cross-sectional view of a movable-side assembly in a vacuum interrupter according to embodiment 3. As shown in FIGS. 7A and 7B, the movable-side electrode rod 7 is made of a metal with high electrical conductivity (e.g., copper) as its base material and is provided with a groove 7a into which the guide 11D is fitted. The width of the groove 7a provided in the movable-side electrode rod 7 is greater than or equal to the width of the guide 11D. Furthermore, the depth of the groove 7a is dimensionally related so that it does not interfere with the end face of the guide 11D when the contacts of the vacuum interrupter are opened.

[0018] Furthermore, a protrusion 7d is provided on the outer periphery of the groove 7a provided on the movable electrode 7 for fitting the bellows cover 8 and bellows 9. The outer diameter of the circumference formed by the protrusion 7d provided on the movable electrode 7 is smaller than or equal to the inner diameters of the bellows cover 8 and bellows 9. The height of the protrusion 7d is larger than or equal to the sum of the thicknesses of the bellows cover 8 and bellows 9. Furthermore, a counterbore 7d1 is provided on the outer periphery of the movable electrode 7 for fitting the inner diameter portion of the right-angle bent portion 8a of the bellows cover 8. The counterbore 7d1 provided on the outer periphery of the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8. The depth of the counterbore is larger than or equal to the length of the right-angle bent portion 8a of the bellows cover 8.

[0019] As described above, the vacuum interrupter according to this embodiment uses a movable electrode bar 7 provided with a groove 7a for fitting the guide 11D, a protrusion 7d for fitting the bellows cover 8 and bellows 9, and a countersunk 7d1 for fitting the inner diameter portion of the right-angle bent portion 8a of the bellows cover 8. The guide 11D is fitted into the groove 7a provided in the movable electrode bar 7, and is attached so that the side of the groove 7a in the movable electrode bar 7 fits along the inner side of the guide 11D. The bellows cover 8 and bellows 9 are joined so as to fit into the protrusion 7d provided on the movable electrode bar 7. Furthermore, the bellows cover 8 is arranged so that the inner diameter portion of the right-angle bent portion 8a fits into the countersunk 7d1 provided in the movable electrode bar 7.

[0020] By shaping the movable electrode 7 as described above, the distance over which the movable electrode 7 is supported by the guide 11D is increased, thereby preventing tilting of the movable electrode 7. Furthermore, preventing tilting of the movable electrode 7 allows the movable contact 6 to be kept in the correct position, improving the interrupting performance of the vacuum interrupter. Furthermore, lateral displacement of the movable contact 6 during short-time withstand current testing and short-circuit application is also prevented. Positioning of the movable electrode 7, bellows cover 8, and bellows 9 is also simplified, improving assembly of the vacuum interrupter. Furthermore, the bellows cover 8 can be reinforced by a right-angle bent portion 8a at the outer periphery of the movable electrode 7, improving mechanical strength.

[0021] Embodiment 4 Figure 10A is an oblique view showing a movable side electrode rod according to embodiment 4, Figure 10B is a cross-sectional view showing a movable side electrode rod according to embodiment 4, Figure 11A is an oblique view showing a guide portion according to embodiment 4, Figure 11B is a cross-sectional view showing a guide portion according to embodiment 4, and Figure 12 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to embodiment 4. As shown in Figures 10A and 10B, the movable electrode bar 7 is made of a metal (e.g., copper) with high electrical conductivity as its base material, and is provided with a groove 7a into which the guide 11D is fitted. The width of the groove 7a provided in the movable electrode bar 7 is larger than or equal to the width of the guide 11D. The depth of the groove 7a is dimensionally related so that it does not interfere with the end face of the guide 11D when the contacts of the vacuum interrupter are opened. A tapered portion 7e (first tapered portion) is provided at the bottom of the groove of the movable electrode bar 7, and a tapered portion 11h (second tapered portion) that follows the shape of the tapered portion 7e is provided at the end face of the guide 11D.

[0022] Furthermore, a protrusion 7d is provided on the outer periphery of the groove 7a provided on the movable electrode 7 for fitting the bellows cover 8 and bellows 9. The outer diameter of the circumference formed by the protrusion 7d provided on the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8 and bellows 9. The height of the protrusion 7d is larger than or equal to the sum of the thicknesses of the bellows cover 8 and bellows 9. A counterbore is provided on the outer periphery of the movable electrode 7 for fitting the inner diameter portion of the right-angle bent portion 8a of the bellows cover 8. The counterbore provided on the outer periphery of the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8. The depth of the counterbore is larger than or equal to the length of the right-angle bent portion 8a of the bellows cover 8.

[0023] As described above, the vacuum interrupter according to this embodiment has a groove 7a in the movable electrode 7 for fitting the guide 11D, and a tapered portion 7e at the bottom of the groove 7a. Furthermore, a protrusion 7d is provided for fitting the bellows cover 8 and bellows 9, and a counterbore is provided for fitting the inner diameter portion of the bent portion 8a of the bellows cover 8 at a right angle. The guide 11D is fitted into the groove 7a in the movable electrode 7, and is attached so that the side of the groove 7a in the movable electrode 7 and the inner side of the guide 11D fit together. The bellows cover 8 and bellows 9 are joined to the protrusion 7d on the movable electrode 7 so that they fit together, and the bellows cover 8 is positioned so that the inner diameter portion of the bent portion 8a at a right angle fits into the counterbore provided in the movable electrode 7.

[0024] By shaping the movable electrode 7 as described above, the distance over which the movable electrode 7 is supported by the guide 11D is increased, and tilting of the movable electrode 7 can be suppressed. Also, by suppressing tilting of the movable electrode 7, the movable contact 6 can be kept in the correct position, improving the interruption performance of the vacuum interrupter. Furthermore, lateral displacement of the movable contact 6 during short-time withstand current testing and short-circuit input can be suppressed. Furthermore, by providing a tapered portion 7e at the bottom of the groove in the movable electrode rod 7 and a tapered portion 11h on the end face of the guide 11D, the mechanical opening and closing of the vacuum valve becomes smoother and malfunctions during mechanical opening and closing can be suppressed. That is, if the end face (tip) of the guide 11D is perpendicular to the side, it will easily get caught on the inside and outside of the groove 7a provided in the movable electrode rod 7 when inserted. In response to this, tapering the end face of the guide 11D and angling the tip has the effect of making it less likely to get caught. Furthermore, according to this embodiment, the movable electrode bar 7, the bellows cover 8, and the bellows 9 can be easily positioned, improving the ease of assembly of the vacuum interrupter. Also, the outer periphery of the movable electrode bar 7 can be reinforced by the portion 8a where the bellows cover 8 is bent at a right angle, improving the mechanical strength. Note that although Figs. 10 to 12 show an example in which the tapered portions 7e and 11h are provided in the structure shown in embodiment 3, each tapered portion may be provided in the structures shown in embodiments 1 and 2.

[0025] Embodiment 5. Figure 13A is an oblique view showing a movable side electrode rod according to embodiment 5, Figure 13B is a cross-sectional view showing a movable side electrode rod according to embodiment 5, Figure 14A is an oblique view showing a guide portion according to embodiment 5, Figure 14B is a cross-sectional view showing a guide portion according to embodiment 5, and Figure 15 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to embodiment 5. 13A and 13B, the movable electrode rod 7 is made of a metal with high electrical conductivity (e.g., copper) as its base material, and is provided with a groove 7a into which the guide 11D is fitted. The width of the groove 7a provided in the movable electrode rod 7 is larger than or equal to the width of the guide 11D. The depth of the groove 7a is sized so that it does not interfere with the end face of the guide 11D when the contacts of the vacuum interrupter are opened.

[0026] In addition, an arc-shaped portion 7f (first arc-shaped portion) that has been subjected to R-machining is provided at the bottom of the groove of the movable electrode rod 7, and an arc-shaped portion 11b (second arc-shaped portion) that follows the shape of the arc-shaped portion 7f that has been subjected to R-machining is provided at the end face of the guide 11D. Furthermore, a protrusion 7d is provided on the outer periphery of the groove 7a provided on the movable electrode 7 for fitting the bellows cover 8 and bellows 9. The outer diameter of the circumference formed by the protrusion 7d provided on the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8 and bellows 9. The height of the protrusion 7d is larger than or equal to the sum of the thicknesses of the bellows cover 8 and bellows 9. A counterbore is provided on the outer periphery of the movable electrode 7 for fitting the inner diameter portion of the right-angle bent portion 8a of the bellows cover 8. The counterbore provided on the outer periphery of the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8. The depth of the counterbore is larger than or equal to the length of the right-angle bent portion 8a of the bellows cover 8.

[0027] As described above, the vacuum interrupter according to this embodiment has a groove 7a in the movable electrode 7 for fitting the guide 11D, and an arc-shaped portion 7f at the bottom of the groove 7a. Furthermore, a protrusion 7d is provided for fitting the bellows cover 8 and bellows 9, and a counterbore is provided for fitting the inner diameter portion of the bent portion 8a of the bellows cover 8 at a right angle. The guide 11D is fitted into the groove 7a in the movable electrode 7, and is attached so that the side of the groove 7a in the movable electrode 7 and the inner side of the guide 11D fit together. The bellows cover 8 and bellows 9 are joined to the protrusion 7d on the movable electrode 7 so that they fit together, and the bellows cover 8 is positioned so that the inner diameter portion of the bent portion 8a at a right angle fits into the counterbore provided in the movable electrode 7.

[0028] By shaping the movable electrode 7 as described above, the distance over which the movable electrode 7 is supported by the guide 11D is increased, and tilting of the movable electrode 7 can be suppressed. Also, by suppressing tilting of the movable electrode 7, the movable contact 6 can be kept in the correct position, improving the interruption performance of the vacuum interrupter. Furthermore, lateral displacement of the movable contact 6 during short-time withstand current testing and short-circuit input can be suppressed. Furthermore, by providing an arc-shaped portion 7f at the bottom of the groove in the movable electrode rod 7 and providing an arc-shaped portion 11b on the end face of the guide 11D, the mechanical opening and closing of the vacuum interrupter becomes smoother and malfunctions during mechanical opening and closing can be suppressed. That is, if the end face (tip) of the guide 11D is perpendicular to the side, it will easily get caught on the inside and outside of the groove 7a provided in the movable electrode rod 7 when inserted. In response to this, by processing the end face of the guide 11D into a rounded shape and angling the tip, it becomes less likely to get caught. Furthermore, according to this embodiment, the movable electrode bar 7, the bellows cover 8, and the bellows 9 can be easily positioned, improving the ease of assembly of the vacuum interrupter. Also, the bellows cover 8 can be reinforced by a portion 8a bent at a right angle around the outer periphery of the movable electrode bar 7, improving mechanical strength. Note that although Figs. 13 to 15 show an example in which the arc-shaped portions 7f and 11b are provided in the structure shown in embodiment 3, each arc-shaped portion may be provided in the structure shown in embodiments 1 and 2.

[0029] Embodiment 6 Figure 16A is an oblique view showing a movable side electrode rod according to embodiment 6, Figure 16B is a cross-sectional view showing a movable side electrode rod according to embodiment 6, Figure 17A is an oblique view showing a guide portion according to embodiment 6, Figure 17B is a cross-sectional view showing a guide portion according to embodiment 6, and Figure 18 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to embodiment 6. 16A and 16B, the movable electrode rod 7 is made of a metal with high electrical conductivity (e.g., copper) as its base material, and is provided with a groove 7a into which the guide 11D is fitted. The width of the groove 7a provided in the movable electrode rod 7 is larger than or equal to the width of the guide 11D. The depth of the groove 7a is sized so that it does not interfere with the end face of the guide 11D when the contacts of the vacuum interrupter are opened.

[0030] Furthermore, a protrusion 7d is provided on the outer periphery of the groove 7a provided on the movable electrode 7 for fitting the bellows cover 8 and bellows 9. The outer diameter of the circumference formed by the protrusion 7d provided on the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8 and bellows 9. The height of the protrusion 7d is larger than or equal to the sum of the thicknesses of the bellows cover 8 and bellows 9. A counterbore is provided on the outer periphery of the movable electrode 7 for fitting the inner diameter portion of the right-angle bent portion 8a of the bellows cover 8. The counterbore provided on the outer periphery of the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8. The depth of the counterbore is larger than or equal to the length of the right-angle bent portion 8a of the bellows cover 8.

[0031] Furthermore, a notch 7g (first notch) is provided on the outer periphery of the current-carrying portion of the movable electrode bar 7 to fit over a protrusion 11c (first protrusion) provided on the inner diameter side of the guide 11D. The width of the notch 7g provided on the movable electrode bar 7 is equal to or greater than the width of the protrusion 11c provided on the inside of the guide 11D. The axial length of the notch 7g is determined so that it does not interfere with the end face of the guide 11D when the contacts of the vacuum interrupter are opened.

[0032] As described above, the vacuum interrupter according to this embodiment uses a movable electrode rod 7 provided with a groove 7a and a notch 7g for fitting the guide 11D, a protrusion 7d for fitting the bellows cover 8 and the bellows 9, and a counterbore for fitting the inner diameter portion of the portion 8a of the bellows cover 8 bent at a right angle. Guide 11D is fitted into groove 7a and notch 9g provided in movable electrode bar 7, and is attached so that side surface 7b of groove 7a in movable electrode bar 7 and inner side surface 11a of guide 11D are aligned. Bellows cover 8 and bellows 9 are joined so as to fit onto protrusion 7d provided on movable electrode bar 7, and furthermore, the bellows cover 8 is arranged by fitting the inner diameter portion of part 8a bent at a right angle into the counterbore provided on movable electrode bar 7.

[0033] By shaping the movable electrode 7 as described above, the distance over which the movable electrode 7 can be supported by the guide 11D is increased, preventing tilting of the movable electrode 7. Furthermore, preventing tilting of the movable electrode 7 allows the movable contact 6 to be maintained in the correct position. This improves the interruption performance of the vacuum interrupter and prevents lateral displacement of the movable contact 6 during short-time withstand current tests and short-circuiting. Furthermore, by fitting the notch 7g of the movable electrode 7 into the protrusion 11c on the inner diameter side of the guide 11D, circumferential rotation is prevented, preventing twisting of the bellows 9 and resulting in poor vacuum in the vacuum interrupter. Furthermore, the movable electrode 7, bellows cover 8, and bellows 9 can be easily positioned, improving the assembly of the vacuum interrupter. Furthermore, the outer periphery of the movable electrode bar 7 can be reinforced by the portion 8a where the bellows cover 8 is bent at a right angle, thereby improving the mechanical strength. Although Fig. 16 to Fig. 18 show an example in which the notch 7g and the protrusion 11c are provided in the structure shown in embodiment 3, the notch and the protrusion may be provided in the structures shown in embodiments 1, 2, 4, and 5.

[0034] Embodiment 7 Figure 19A is an oblique view showing a movable side electrode rod according to embodiment 7, Figure 19B is a cross-sectional view showing a movable side electrode rod according to embodiment 6, Figure 20A is an oblique view showing a guide part according to embodiment 7, Figure 20B is a cross-sectional view showing a guide part according to embodiment 7, and Figure 21 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to embodiment 7. 19A and 19B, the movable electrode rod 7 is made of a metal with high electrical conductivity (e.g., copper) as its base material, and is provided with a groove 7a into which the guide 11D is fitted. The width of the groove 7a provided in the movable electrode rod 7 is larger than or equal to the width of the guide 11D. The depth of the groove 7a is sized so that it does not interfere with the end face of the guide 11D when the contacts of the vacuum interrupter are opened.

[0035] Furthermore, a protrusion 7d is provided on the outer periphery of the groove 7a provided on the movable electrode 7 for fitting the bellows cover 8 and bellows 9. The outer diameter of the circumference formed by the protrusion 7d provided on the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8 and bellows 9. The height of the protrusion 7d is larger than or equal to the sum of the thicknesses of the bellows cover 8 and bellows 9. A counterbore is provided on the outer periphery of the movable electrode 7 for fitting the inner diameter portion of the right-angle bent portion 8a of the bellows cover 8. The counterbore provided on the outer periphery of the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8. The depth of the counterbore is larger than or equal to the length of the right-angle bent portion 8a of the bellows cover 8.

[0036] The outer periphery of the current-carrying part of the movable electrode rod 7 and the inner diameter side part of the guide 11D have a polygonal structure (for example, a hexagonal structure). The polygonal part of the movable electrode rod 7 is smaller than or equal in size to the hole that forms the polygonal part on the inside of the guide 11D, and the length of the polygonal part of the movable electrode rod 7 is dimensionally related so that it does not interfere with the end face of the guide 11D when the contacts of the vacuum interrupter are opened.

[0037] As described above, the vacuum interrupter according to this embodiment uses a movable electrode rod 7 provided with a groove 7a for fitting the guide 11D, a polygonal portion, a protrusion 7d for fitting the bellows cover 8 and bellows 9, and a counterbore for fitting the inner diameter portion of the portion 8a of the bellows cover 8 bent at a right angle. Guide 11D is fitted into groove 7a and the polygonal portion of movable electrode bar 7, and is attached so that side surface 7b of groove 7a in movable electrode bar 7 fits along the inner side surface 11a of guide 11D. Bellows cover 8 and bellows 9 are joined so as to fit onto protrusion 7d provided on movable electrode bar 7, and further, the bellows cover 8 is arranged by fitting the inner diameter portion of part 8a bent at a right angle into the counterbore provided on movable electrode bar 7.

[0038] By shaping the movable electrode 7 as described above, the distance over which the movable electrode 7 can be supported by the guide 11D is increased, thereby preventing tilting of the movable electrode 7. Furthermore, preventing tilting of the movable electrode 7 allows the movable contact 6 to be maintained in the correct position. This improves the interruption performance of the vacuum interrupter and further prevents lateral displacement of the movable contact 6 during short-time withstand current tests and short-circuiting. Furthermore, by fitting the polygonal portion (first polygonal portion) on the outer periphery of the current-carrying portion of the movable electrode 7 with the polygonal portion (second polygonal portion) forming the hole on the inner diameter side of the guide 11D, circumferential rotation is prevented, preventing vacuum failure in the vacuum interrupter due to twisting of the bellows 9. Furthermore, the positioning of the movable electrode 7, the bellows cover 8, and the bellows 9 can be easily performed, improving the assembly of the vacuum interrupter. Furthermore, the bellows cover 8 is reinforced by the right-angle bent portion 8a on the outer periphery of the movable electrode 7, improving its mechanical strength. 19 to 21 show an example in which a polygonal portion is provided in the structure shown in the third embodiment, but a polygonal portion may also be provided in the structures shown in the first, second, fourth and fifth embodiments.

[0039] Embodiment 8 Figure 22A is an oblique view showing a movable side electrode rod according to embodiment 8, Figure 22B is a cross-sectional view showing a movable side electrode rod according to embodiment 8, Figure 23A is an oblique view showing a guide portion according to embodiment 8, Figure 23B is a cross-sectional view showing a guide portion according to embodiment 8, and Figure 24 is a cross-sectional view showing a movable side assembly in a vacuum valve according to embodiment 8. 22A and 22B, the movable electrode rod 7 is made of a metal with high electrical conductivity (e.g., copper) as its base material, and is provided with a groove 7a into which the guide 11D is fitted. The width of the groove 7a provided in the movable electrode rod 7 is larger than or equal to the width of the guide 11D. The depth of the groove 7a is sized so that it does not interfere with the end face of the guide 11D when the contacts of the vacuum interrupter are opened.

[0040] Furthermore, a protrusion 7d is provided on the outer periphery of the groove 7a provided on the movable electrode 7 for fitting the bellows cover 8 and bellows 9. The outer diameter of the circumference formed by the protrusion 7d provided on the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8 and bellows 9. The height of the protrusion 7d is larger than or equal to the sum of the thicknesses of the bellows cover 8 and bellows 9. A counterbore is provided on the outer periphery of the movable electrode 7 for fitting the inner diameter portion of the right-angle bent portion 8a of the bellows cover 8. The counterbore provided on the outer periphery of the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8. The depth of the counterbore is larger than or equal to the length of the right-angle bent portion 8a of the bellows cover 8.

[0041] In addition, a notch 7h (second notch) is provided in the center of the current-carrying portion of the movable electrode bar 7 and from the center to the outer periphery. Furthermore, a protrusion 11d having the same shape as the notch 7h in the movable electrode bar 7 is provided on the inner diameter side of the guide 11D. The notch 7h in the movable electrode bar 7 is larger than or has the same size as the protrusion 11d provided inside the guide 11D, and the length of the notch 7h is sized so that it does not interfere with the end face of the guide 11D when the contacts of the vacuum interrupter are opened. This allows the protrusion 11d to fit into the notch 7h.

[0042] As described above, the vacuum interrupter according to this embodiment uses a movable electrode rod 7 provided with a groove 7a and a notch 7h for fitting the guide 11D, a protrusion 7d for fitting the bellows cover 8 and the bellows 9, and a counterbore for fitting the inner diameter portion of the portion 8a of the bellows cover 8 bent at a right angle. Guide 11D is fitted into groove 7a and notch 7h provided in movable electrode bar 7, and is attached so that side surface 7b of groove 7a in movable electrode bar 7 and inner side surface 11a of guide 11D are aligned. Bellows cover 8 and bellows 9 are joined so as to fit onto protrusion 7d provided on movable electrode bar 7, and furthermore, the bellows cover 8 is arranged by fitting the inner diameter portion of part 8a bent at a right angle into the counterbore provided on movable electrode bar 7.

[0043] By shaping the movable electrode 7 as described above, the distance over which the movable electrode 7 can be supported by the guide 11D is increased, preventing tilting of the movable electrode 7. Furthermore, preventing tilting of the movable electrode 7 allows the movable contact 6 to be maintained in the correct position. This improves the interrupting performance of the vacuum interrupter and prevents lateral displacement of the movable contact 6 during short-time withstand current testing and short-circuiting. Furthermore, by fitting the notch 7h of the movable electrode 7 into the protrusion 11d on the inner diameter side of the guide 11D, circumferential rotation is prevented, preventing twisting of the bellows 9 and resulting in poor vacuum in the vacuum interrupter. Furthermore, the positioning of the movable electrode 7, the bellows cover 8, and the bellows 9 is simplified, improving the assembly of the vacuum interrupter. Furthermore, the bellows cover 8 is reinforced by the right-angle bent portion 8a at the outer periphery of the movable electrode 7, improving its mechanical strength. 22 to 24 show an example in which the notch 7h and the protrusion 11d are provided in the structure shown in the third embodiment, but the notch and the protrusion may be provided in the structures shown in the first, second, fourth and fifth embodiments.

[0044] Embodiment 9 Figure 25A is an oblique view showing a movable side electrode rod according to embodiment 9, Figure 25B is a cross-sectional view showing a movable side electrode rod according to embodiment 9, Figure 26A is an oblique view showing a guide portion according to embodiment 9, Figure 26B is a cross-sectional view showing a guide portion according to embodiment 9, and Figure 27 is a cross-sectional view showing a movable side assembly in a vacuum interrupter according to embodiment 9. 25A and 25B, the movable electrode rod 7 is made of a metal with high electrical conductivity (e.g., copper) as its base material, and is provided with a groove 7a into which the guide 11D is fitted. The inner diameter of the groove 7a provided in the movable electrode rod 7 is smaller than or equal to the inner diameter of the guide 11D, and the outer diameter of the groove 7a is larger than the outer diameter of the guide 11D. Furthermore, the depth of the groove 7a is set so that it does not interfere with the end face of the guide 11D when the contacts of the vacuum interrupter are opened. Further, a protrusion 7d is provided on the outer periphery of the groove 7a provided in the movable electrode rod 7, into which the bellows cover 8 and the bellows 9 are fitted.

[0045] The outer diameter of the circumference formed by the protrusion 7d on the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8 and bellows 9. The height of the protrusion 7d is larger than or equal to the sum of the thicknesses of the bellows cover 8 and bellows 9. A counterbore is provided on the outer periphery of the movable electrode 7 to fit into the inner diameter of the portion 8a of the bellows cover 8 bent at a right angle. The counterbore on the outer periphery of the movable electrode 7 is smaller than or equal to the inner diameter of the bellows cover 8. The depth of the counterbore is larger than or equal to the length of the portion 8a of the bellows cover 8 bent at a right angle.

[0046] Additionally, holes 7j (first holes) for allowing air to pass through are provided in several locations in the center and side of the current-carrying portion of the movable electrode 7. The side holes 7j are designed to be through holes, but the center hole 7j is designed not to pass through to the space maintained in a vacuum state. The reason why the center hole 7j is not through holes on both sides is that if it were through holes, it would connect to the inside of the vacuum valve, making it impossible to maintain a vacuum state. Furthermore, the hole 11e (second hole) provided on the side of the guide 11D has a width that is larger than or equal to the diameter of the holes 7j provided on the side of the movable electrode 7, and its height is dimensionally related to the dimensions so that all of the holes 7j provided on the side of the movable electrode 7 can be accommodated.

[0047] As described above, the vacuum interrupter according to this embodiment uses a movable electrode bar 7 provided with groove 7a for fitting guide 11D, protrusion 7d for fitting bellows cover 8 and bellows 9, counterbore for fitting the inner diameter portion of portion 8a bent at a right angle of bellows cover 8, and hole 7j for passing air, as well as guide 11D provided with hole 11e for passing air. Guide 11D is fitted into groove 7a provided in movable electrode bar 7, and is attached so that side surface 7b of groove 7a in movable electrode bar 7 fits along the inner side surface 11a of guide 11D. The bellows cover 8 and bellows 9 are joined so as to fit onto the protrusion 7d provided on the movable electrode bar 7, and further the inner diameter portion of the part 8a bent at a right angle of the bellows cover 8 is fitted into the counterbore provided on the movable electrode bar 7, and the holes for passing air provided on the movable electrode bar 7 and guide 11D are aligned so that the holes 7j and 11e are connected.

[0048] By shaping the movable electrode rod 7 as described above, the distance over which the movable electrode rod 7 can be supported by the guide 11D is increased, preventing tilting of the movable electrode rod 7. Furthermore, preventing tilting of the movable electrode rod 7 allows the movable contact 6 to be kept in the correct position. This improves the interruption performance of the vacuum interrupter and prevents lateral displacement of the movable contact 6 during short-time withstand current tests and short-circuiting. Furthermore, the positioning of the movable electrode rod 7, the bellows cover 8, and the bellows 9 is simplified, improving the assembly of the vacuum interrupter. Furthermore, the bellows cover 8 is reinforced by the right-angle bent portion 8a around the outer periphery of the movable electrode rod 7, improving mechanical strength. Furthermore, by providing air passage holes in the center and side of the movable electrode rod 7 and in the side of the guide 11D, a path for air trapped between the bellows 9 and the guide 11D can be created. This reduces the pressure difference of trapped air, smoothing the mechanical opening and closing of the vacuum interrupter and preventing malfunctions during mechanical opening and closing. The holes for passing air are not connected to the inside of the vacuum valve, so the vacuum state inside the vacuum valve is maintained. Although Figures 25 to 27 show an example in which holes are provided in the structure shown in embodiment 3, holes may also be provided in the structures shown in embodiments 1, 2, and 4 to 8.

[0049] Embodiment 10 Figure 28A is an oblique view showing a movable side electrode rod according to embodiment 10, Figure 28B is a cross-sectional view showing a movable side electrode rod according to embodiment 10, Figure 29A is an oblique view showing a guide portion according to embodiment 10, Figure 29B is a cross-sectional view showing a guide portion according to embodiment 10, and Figure 30 is a cross-sectional view showing a movable side assembly in a vacuum valve according to embodiment 10. As shown in Figures 28A and 28B, the movable electrode bar 7 is made of a metal with high electrical conductivity (e.g., copper) as its base material and is provided with multiple grooves 7k (first grooves) for fitting with the guide 11D. While Figures 28A and 28B show an example in which two grooves 7k are provided, three or more grooves may be provided. Also, grooves 11f (second grooves) for fitting with the grooves 7k of the movable electrode bar 7 are provided on the end surface of the guide 11D. The grooves of each component have widths that allow them to fit together, and their depths are dimensionally related so that the movable electrode bar 7 and the end surface of the guide 11D do not interfere with each other when the vacuum interrupter contacts are opened. Furthermore, protrusions 7k1 present between the grooves 7k are fitted into the grooves 11f.

[0050] Furthermore, a protrusion 7d is provided on the outer periphery of the groove 7k provided in the movable electrode bar 7, into which the bellows cover 8 and bellows 9 are fitted. The outer diameter of the circumference formed by the protrusion 7d provided on the movable electrode bar 7 is smaller than or equal to the inner diameter of the bellows cover 8 and bellows 9. The height of the protrusion 7d is larger than or equal to the sum of the thicknesses of the bellows cover 8 and bellows 9. A counterbore is provided on the outer periphery of the movable electrode rod 7 to fit into the inner diameter of the portion 8a of the bellows cover 8 bent at a right angle. The counterbore provided on the outer periphery of the movable electrode rod 7 is smaller than or equal to the inner diameter of the bellows cover 8. The depth of the counterbore is greater than or equal to the length of the portion 8a of the bellows cover 8 bent at a right angle.

[0051] Additionally, holes 7j for allowing air to pass through are provided in several locations in the center and side of the current-carrying portion of the movable electrode 7. The side holes 7j are designed to be through holes, but the center hole 7j is designed not to pass through to the space maintained in a vacuum state. The reason why the center hole 7j is not designed to be through holes on both sides is that if it were through holes, they would connect to the inside of the vacuum valve, making it impossible to maintain a vacuum state. Furthermore, the holes 11e on the side of the guide 11D have a width that is larger than or equal to the diameter of the holes 7j on the side of the movable electrode 7, and a height that allows all of the holes 7j on the side of the movable electrode 7 to fit inside. The width of the groove 11f provided on the end surface of the guide 11D is larger than or equal to the width of the protrusion 7k1 located between the two grooves 7k provided on the movable electrode bar 7. The depth of the groove 11f is larger than or equal to the height of the protrusion 7k1 located between the two grooves 7k provided on the movable electrode bar 7.

[0052] As described above, the vacuum interrupter according to this embodiment uses a movable electrode bar provided with a groove for fitting guide 11D, protrusion 7d for fitting bellows cover 8 and bellows 9, a counterbore for fitting the inner diameter portion of bellows cover 8 bent at a right angle, and a hole for air passage, as well as a guide D provided with a hole for air passage. Groove 7k in movable electrode bar 7 is fitted into groove 11f in guide 11D, and the side of groove 7k in movable electrode bar 7 is attached to the inner side of guide 11D. The bellows cover 8 and bellows 9 are joined so as to fit onto protrusion 7d on movable electrode bar 7, and the inner diameter portion of bellows cover 8 bent at a right angle is fitted into the counterbore in movable electrode bar 7, and the holes for air passage in movable electrode bar 7 and guide 11D are aligned.

[0053] By shaping the movable electrode 7 as described above, the distance over which the movable electrode 7 can be supported by the guide 11D is increased, thereby preventing tilting of the movable electrode 7. Furthermore, by providing a groove 11f on the end face of the guide 11D for fitting with the movable electrode 7, the number of positions for supporting the side surface is increased, further preventing tilting of the movable electrode 7. Furthermore, preventing tilting of the movable electrode 7 keeps the movable contact 6 in the correct position. This improves the interruption performance of the vacuum interrupter and also prevents lateral displacement of the movable contact 6 during short-time withstand current testing and short-circuit application.

[0054] Furthermore, the movable electrode rod 7, bellows cover 8, and bellows 9 can be positioned easily, improving the ease of assembly of the vacuum interrupter. Furthermore, the outer periphery of the movable electrode rod 7 can be reinforced by the right-angle bent portion 8a of the bellows cover 8, improving the mechanical strength. Furthermore, by providing holes for air passage in the center and side of the movable electrode rod 7 and also in the side of the guide 11D, a path can be created for the air that has accumulated between the bellows 9 and the guide 11D. This reduces the pressure difference of the accumulated air, allowing the mechanical opening and closing of the vacuum valve to be smoother and preventing malfunctions during mechanical opening and closing. Since the holes for air passage are not connected to the inside of the vacuum valve, the vacuum state inside the vacuum valve is maintained. While Figures 28 to 30 show an example in which grooves 7k and 11f are provided in the structure shown in embodiment 9, grooves may also be provided in the structures shown in embodiments 1 to 8.

[0055] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not exemplified are conceivable within the scope of the technology disclosed in this specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of another embodiment.

[0056] Various aspects of the present disclosure will be summarized below.

[0057] (Appendix 1) A vacuum interrupter having an insulating container with a fixed metal end plate and a movable metal end plate fixed to both ends, a fixed electrode rod fixed to the fixed metal end plate, a movable electrode rod movably attached to the movable metal end plate via a bellows and a bellows cover, a fixed contact provided at the end of the fixed electrode rod, and a movable contact provided at the end of the movable electrode rod, A vacuum valve in which a groove for fitting an axially extending guide is provided in the movable electrode rod, and the movable electrode rod is attached so that the side surface of the groove fits along the inner side surface of the guide. (Appendix 2) 2. A vacuum valve according to claim 1, wherein the width of the groove is greater than or equal to the width of the guide, and the depth of the groove is such that the end face of the guide does not interfere with the groove when the vacuum valve is opened. (Appendix 3) 3. The vacuum valve according to claim 1, wherein a protrusion is provided on the outer periphery of the groove provided in the movable electrode rod for fitting the bellows cover and the bellows therein. (Appendix 4) 4. The vacuum valve according to claim 1, wherein a counterbore is provided on the outer periphery of the movable electrode rod to fit into the inner diameter portion of the portion of the bellows cover bent at a right angle. (Appendix 5) A vacuum valve according to any one of appendix 1 to appendix 4, wherein a first tapered portion is provided at the bottom of the groove of the movable electrode bar and a second tapered portion is provided on the end face of the guide. (Appendix 6) A vacuum valve according to any one of claims 1 to 4, wherein a first arc-shaped portion is provided at the bottom of the groove of the movable electrode bar, and a second arc-shaped portion is provided on the end face of the guide. (Appendix 7) A vacuum valve according to any one of appendices 1 to 6, wherein a first notch is provided on the outer periphery of the current-carrying portion of the movable electrode rod for fitting with a protrusion provided on the inner diameter side of the guide. (Appendix 8) 7. A vacuum valve according to any one of claims 1 to 6, wherein a first polygonal portion provided on the outer periphery of the current-carrying portion of the movable electrode bar and a second polygonal portion provided on the inner diameter side of the guide are fitted together. (Appendix 9) A vacuum valve according to any one of appendices 1 to 6, wherein second notches are provided at the center of the current-carrying portion of the movable electrode bar and from the center to the outer periphery, into which protrusions provided on the guide are fitted. (Appendix 10) A vacuum valve according to any one of Supplementary Note 1 to Supplementary Note 9, wherein a first hole for passing air is provided in the center and side of the current-carrying part of the movable electrode bar, and a second hole for passing air is provided in the side of the guide so as to communicate with the first hole. (Appendix 11) A vacuum valve according to any one of appendices 1 to 10, wherein the movable electrode bar is provided with a plurality of first grooves for fitting the guide thereinto, and second grooves are provided on the end face of the guide for fitting with protrusions present between the first grooves. (Appendix 12) 12. The vacuum interrupter according to claim 1, wherein the material of the movable electrode rod is a metal having high electrical conductivity. [Explanation of symbols]

[0058] 1 insulating container, 2 shield, 3 fixed contact, 4 fixed electrode rod, 5 Fixed side metal end plate, 6 Movable side contact, 7 Movable side electrode rod, 7a groove, 7b side surface, 7c protrusion, 7d1 counterbore, 7e first tapered portion, 7f first arc-shaped portion, 7g first notch, 7h second notch, 7j first hole, 7k first groove, 8 Bellows cover, 9 Bellows, 10 Movable side metal end plate, 11D guide, 11a inner side surface, 11b second arc-shaped portion, 11c protrusion, 11d protrusion, 11e: second hole, 11f: second groove, 11h: second tapered portion.

Claims

1. A vacuum interrupter having an insulating container with a fixed metal end plate and a movable metal end plate fixed to both ends, a fixed electrode rod fixed to the fixed metal end plate, a movable electrode rod movably attached to the movable metal end plate via a bellows and a bellows cover, a fixed contact provided at the end of the fixed electrode rod, and a movable contact provided at the end of the movable electrode rod, A vacuum valve in which a groove for fitting an axially extending guide is provided in the movable electrode rod, and the movable electrode rod is attached so that the side surface of the groove fits along the inner side surface of the guide.

2. 2. A vacuum valve according to claim 1, wherein the width of the groove is greater than or equal to the width of the guide, and the depth of the groove is such that the end face of the guide does not interfere with the groove when the vacuum valve is opened.

3. 3. The vacuum valve according to claim 1, wherein a projection is provided on the outer periphery of the groove formed in the movable electrode rod for fitting the bellows cover and the bellows therein.

4. 3. A vacuum valve according to claim 1, wherein a counterbore is provided on the outer periphery of said movable electrode rod to fit into the inner diameter portion of the bent portion of said bellows cover at a right angle.

5. 3. The vacuum valve according to claim 1, wherein a first tapered portion is provided at the bottom of the groove of the movable electrode rod, and a second tapered portion is provided on the end face of the guide.

6. 3. The vacuum valve according to claim 1, wherein a first arc-shaped portion is provided at the bottom of the groove of the movable electrode rod, and a second arc-shaped portion is provided on the end face of the guide.

7. 3. The vacuum valve according to claim 1, wherein a first notch is provided on the outer periphery of the current-carrying portion of the movable electrode rod, into which a first protrusion provided on the inner diameter side of the guide is fitted.

8. 3. The vacuum valve according to claim 1, wherein a first polygonal portion provided on the outer periphery of the current-carrying portion of the movable electrode rod and a second polygonal portion provided on the inner diameter side of the guide are fitted together.

9. 3. A vacuum valve according to claim 1, wherein second notches are provided at the center of the current-carrying portion of the movable electrode rod and from the center to the outer periphery, into which protrusions provided on the guide are fitted.

10. 3. A vacuum valve according to claim 1, wherein a first hole for passing air is provided in the center and side of the current-carrying portion of the movable electrode rod, and a second hole for passing air is provided in the side of the guide so as to communicate with the first hole.

11. 3. A vacuum valve according to claim 1, wherein the movable electrode rod is provided with a plurality of first grooves for fitting the guide thereinto, and second grooves are provided on the end face of the guide for fitting with protrusions present between the first grooves.

12. 3. A vacuum interrupter according to claim 1, wherein the movable electrode rod is made of a metal having high electrical conductivity.

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