Vacuum valve

Abstract

An electrode (20B) of the vacuum valve (100) has a coil (K) installed on an electrode rod (4B). The coil (K) is formed by combining a first coil (23) and a second coil (24) in the axial direction (Z). The first coil (23) has a plurality of first split coil portions (23c) extending in an arc shape in one circumferential direction Y. The second coil (24) has a plurality of second split coil portions (24c) extending in an arc shape in the other circumferential direction (Y). A circumferential tip of the first split coil portion (23c) of the first coil (23) is connected to a tip of the second split coil portion (24c) of the second coil (24) to form a plurality of current paths. A first space (S3) is formed between the first split coil portion (23c) and a portion of the adjacent second split coil portion (24c) other than the first coil contact portion (24d).

Description

[Technical field]

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

[0002] Conventional vacuum valves use an insulating cylinder made of glass, alumina ceramics, or the like as a vacuum container, with fixed and movable flanges made of metal attached to metallized layers formed on both ends of the insulating cylinder to keep the container airtight at a high vacuum.

[0003] A fixed electrode bar and a movable electrode bar are attached to the fixed flange and movable flange, respectively, fixed to both ends of the insulating cylinder, in a coaxial manner and facing each other. A fixed electrode and a movable electrode are fixed to the opposing ends of each electrode bar, respectively.

[0004] A bellows is provided between the movable electrode bar and the movable flange so that the movable electrode can move along the axis of the insulating cylinder while maintaining airtightness. An umbrella-shaped bellows cover is fixed to the movable electrode bar to prevent the bellows from being contaminated by an arc generated when the current is interrupted. The electrode side of the bellows itself is fixed to the bellows cover or the bellows cover and the movable electrode bar, and the side of the bellows opposite the electrode is attached to the movable flange.

[0005] An arc shield is provided inside the insulating container to surround the opposing electrodes, preventing the inner surface of the insulating cylinder from being contaminated by the arc that occurs when the current is interrupted. A guide with a bearing function is attached to the end of the movable side so that the movable side can move smoothly on the axis during the opening and closing process.

[0006] One of the above-mentioned electrodes is a vertical magnetic field electrode. For example, in the one described in Patent Document 1, a fixed contact (arc electrode) and a movable contact (arc electrode) are arranged opposite to each other, and a coil electrode is provided on the back of each. The coil electrode is a coil extending in the circumferential direction attached to the tip of an arm extending in the radial direction from the axial center. When a current flows in the circumferential direction in this coil, a magnetic field in the axial direction (vertical magnetic field) is generated for the arc according to the right-hand screw rule. When a vertical magnetic field is applied to the arc, the arc between the contacts that is inevitably generated when breaking the current is confined within the diameter of the contacts, while being diffused to the contact surface, and the current density on the contact surface is reduced, thereby making it possible to break the current effectively.

[0007] On the other hand, in the vertical magnetic field electrode shown in Patent Document 2, a slit is made obliquely in a cup-shaped electrode. By making the slit in this way, a current flows in the circumferential direction, generating a vertical magnetic field, and as in the case of Patent Document 1, the current is effectively interrupted. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2002-150902 A [Patent Document 2] JP 2003-92050 A Summary of the Invention [Problem to be solved by the invention]

[0009] In a vacuum interrupter that generates an axial magnetic field at the contacts to improve the current interruption performance as described above, a power supply is provided on the coil electrode or cup-shaped coil to pass current between the coil electrode or cup-shaped coil and the contacts. The larger the area on the contact surface where an axial magnetic field with the required magnetic flux density is generated, called the effective magnetic field area, the more the current density on the contact surface can be reduced, enabling more effective current interruption. However, since a magnetic field cannot be generated in the axial direction near the power supply provided on the coil electrode or cup-shaped coil, the effective magnetic field area is lost.

[0010] If the value of the current to be passed increases, the area of ​​the power supply section must be expanded to ensure the current capacity, resulting in further loss of effective magnetic field area. Therefore, there is a problem in that the diameters of the coil electrodes, cup-shaped coils, and contacts must be increased in order to ensure the effective magnetic field area.

[0011] Generally, when attempting to increase the breaking current, there is a tendency to increase the contact diameter, coil electrode diameter, and cup-shaped coil diameter in order to ensure heat capacity and effective magnetic field area. However, when the coil electrode diameter and cup-shaped coil diameter are increased, the distance between the center of the contact and the coil part which generates the axial magnetic field increases, so the magnetic flux density near the center of the contact decreases, resulting in a problem that the efficiency of ensuring the effective magnetic field area decreases due to the increased size.

[0012] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a vacuum interrupter that can efficiently ensure uniformity of magnetic flux density and effective magnetic field area and improve current interruption performance without increasing the diameter of the electrodes. [Means for solving the problem]

[0013] The vacuum valve disclosed in this disclosure comprises: A vacuum valve having a pair of electrodes arranged axially opposite each other in a vacuum vessel and movable toward and away from each other by means of electrode rods, At least one of the electrodes has a coil installed on the electrode rod and a contact connected to the coil, The coil is formed by combining a first coil and a second coil in the axial direction, The first coil has an annular fitting portion that is fitted with the electrode bar, a plurality of first arm portions extending radially outward from the fitting portion; and a plurality of first split coil portions connected to the radially outer sides of the first arm portions and extending in an arc shape in one circumferential direction, the second coil has a disk-shaped contact portion that contacts the contact point, a plurality of second arm portions that extend radially outward from the contact portion, and a plurality of second split coil portions that are connected to the radially outer sides of the second arm portions and extend in an arc shape in the other circumferential direction, The first coil and the second coil are each formed with a plurality of current paths by connecting a first coil contact portion at a circumferential end of the first split coil portion of the first coil to a circumferential end of the second split coil portion of the second coil, A first space is formed between the first split coil portion of the first coil and a portion of the adjacent second split coil portion other than the first coil contact portion. And, A second space is formed between the second split coil portion and a lower surface of the contact. It is something. Effect of the Invention

[0014] According to the vacuum valve disclosed in the present disclosure, it is possible to obtain a vacuum valve that can efficiently ensure uniformity of magnetic flux density and effective magnetic field area without increasing the diameter of the electrodes, thereby improving current interruption performance. [Brief description of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view of a vacuum interrupter according to a first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view showing the configuration of a movable-side electrode according to the first embodiment. [Diagram 3] FIG. 2 is a top view of a first coil according to the first embodiment. [Figure 4]Fig. 4A is a bottom view of the second coil according to embodiment 1. Fig. 4B is a top view of the second coil. Fig. 4C is a perspective view of the second coil, as viewed from the lower Z- side in the axial direction Z. [Diagram 5] 1 is a diagram showing a state in which the first coil and the second coil according to the first embodiment are combined, as viewed from the upper Z+ side in the axial direction Z. FIG. [Figure 6] Fig. 6A is a cross-sectional view of the movable-side electrode according to the first embodiment taken along line AA in Fig. 5. Fig. 6B is a cross-sectional view of the movable-side electrode taken along line BB in Fig. 5. [Figure 7] Fig. 7A is a bottom view of the contact according to embodiment 1. Fig. 7B is a perspective view of the contact, as viewed from the lower Z- side in the axial direction Z. [Figure 8] Fig. 8A is a bottom view of the second coil according to embodiment 2. Fig. 8B is a top view of the second coil. [Figure 9] Fig. 9A is a bottom view of the contact according to embodiment 2. Fig. 9B is a perspective view of the contact, as viewed from the lower Z- side in the axial direction Z. [Figure 10] Fig. 10A is a cross-sectional view of a movable-side electrode according to embodiment 2. Fig. 10B is a cross-sectional view of the movable-side electrode. [Figure 11] Fig. 11A is a bottom view of a modified second coil according to embodiment 2. Fig. 11B is a top view of the modified second coil. [Figure 12] Fig. 12A is a cross-sectional view of a modified movable-side electrode according to embodiment 2. Fig. 12B is a cross-sectional view of a modified movable-side electrode. [Figure 13] Fig. 13A is a bottom view of the second coil according to embodiment 3. Fig. 13B is a top view of the second coil. [Figure 14] 13 is a diagram showing a state in which the first coil and the second coil according to the third embodiment are combined, as viewed from the upper Z+ side in the axial direction Z. FIG. [Figure 15] FIG. 11 is an exploded perspective view showing the configuration of a movable-side electrode according to embodiment 4. [Figure 16]Fig. 16A is a bottom view of the second coil according to embodiment 4. Fig. 16B is a top view of the second coil. [Figure 17] 13 is a diagram showing a state in which the first coil and the second coil according to the fourth embodiment are combined, as viewed from the upper Z+ side in the axial direction Z. FIG. [Figure 18] Fig. 18A is a cross-sectional view of the movable side electrode according to embodiment 1 taken along line AA in Fig. 17. Fig. 18B is a cross-sectional view of the movable side electrode taken along line BB in Fig. 17. [Figure 19] FIG. 13 is an exploded perspective view showing the configuration of a movable-side electrode according to embodiment 5. [Figure 20] FIG. 13 is a top view of a first coil according to the fifth embodiment. [Figure 21] Fig. 21A is a bottom view of the second coil according to embodiment 5. Fig. 21B is a top view of the second coil. Fig. 21C is a perspective view of the second coil, showing the second coil as viewed from the lower Z- side in the axial direction Z. Fig. 21D is a side view of the second coil. [Figure 22] 13 is a diagram showing a state in which the first coil and the second coil according to the fifth embodiment are combined, as viewed from the upper Z+ side in the axial direction Z. FIG. [Figure 23] Fig. 23A is a cross-sectional view of the movable side electrode according to embodiment 5 taken along line AA in Fig. 22. Fig. 23B is a cross-sectional view of the movable side electrode taken along line BB in Fig. 22. [Figure 24] FIG. 13 is an exploded perspective view showing the configuration of a movable-side electrode according to the sixth embodiment. [Diagram 25] Fig. 25A is a bottom view of the second coil according to embodiment 6. Fig. 25B is a top view of the second coil. Fig. 25C is a perspective view of the second coil, showing the second coil as viewed from the lower Z- side in the axial direction Z. Fig. 25D is a side view of the second coil. [Figure 26] 13 is a diagram showing a state in which the first coil and the second coil according to the sixth embodiment are combined, as viewed from the upper Z+ side in the axial direction Z. FIG. [Figure 27]Fig. 27A is a cross-sectional view of the movable side electrode according to embodiment 6 taken along line AA in Fig. 26. Fig. 27B is a cross-sectional view of the movable side electrode taken along line BB in Fig. 26. [Figure 28] FIG. 13 is a perspective view of an electrode as a comparative example. [Figure 29] FIG. 13 is a top view of a coil electrode as a comparative example. [Diagram 30] FIG. 13 is a perspective view of an electrode as a comparative example. [Diagram 31] FIG. 11 is a side view of a coil electrode as a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Embodiment 1 The vacuum interrupter according to the first embodiment will be described below with reference to the drawings. In this specification, the place where the movable contact and fixed contact of the vacuum interrupter come into contact is described as "upper", and the direction in which they move away from there is described as "lower". Therefore, the upper and lower relationship of the movable electrode is reversed to the upper and lower relationship of the fixed electrode. Also, the axial direction of the electrode, i.e., the direction in which the two contacts come into contact and separate, is defined as the axial direction Z, the radial direction of the electrode as the radial direction X, and the circumferential direction of the electrode as the circumferential direction Y.

[0017] 1 is a cross-sectional view of a vacuum valve 100 according to embodiment 1. The vacuum valve 100 has a cylindrical insulating cylinder 1 made of an insulating material such as alumina ceramics or glass, and a fixed flange 2A and a movable flange 2B made of a metal such as stainless steel are fixed to a metallized layer 1M formed on both ends of the insulating cylinder 1 to form a container and to keep the inside of the container airtight at a high vacuum.

[0018] A fixed electrode 4A is fixed to a fixed flange 2A fixed to one end in the axial direction Z of the insulating cylinder 1, and a movable electrode 4B is attached to a movable flange 2B via a bellows 3. One end of the bellows 3 is fixed to the movable flange 2B so as to surround the movable electrode 4B, and the other end of the bellows 3 is fixed to the movable electrode 4B so as to surround the movable electrode 4B via a bellows cover 3C provided for the purpose of preventing the bellows 3 from being soiled by an arc generated when the current is interrupted.

[0019] A fixed electrode 20A is attached to the fixed electrode bar 4A, and a movable electrode 20B is attached to the movable electrode bar 4B, so that they face each other in the axial direction Z. The only difference between the configurations of the fixed electrode 20A and the movable electrode 20B is whether the electrode bar is movable or not, so in the following explanation, the configuration will be explained using the movable electrode 20B.

[0020] An arc shield AS is provided within the insulating cylinder 1 so as to surround the contacts 21 facing each other in the axial direction Z. A guide G having a bearing function is attached to the movable flange 2B of the movable electrode bar 4B so that the movable electrode bar 4B can move smoothly in the axial direction Z during the opening and closing operations.

[0021] FIG. 2 is an exploded perspective view showing the configuration of the movable side electrode 20B. 2, the movable electrode 20B is composed of a contact 21, a reinforcing part 22, and a coil K consisting of a first coil 23 and a second coil 24. The movable electrode bar 4B is provided with a fitting portion 4Ba into which the first coil 23 is fitted, and the first coil 23 is fitted and fixed.

[0022] FIG. 3 is a top view of the first coil 23. As shown in FIG. The first coil 23 has, at its center, an annular fitting portion 23a fixed to the movable electrode bar 4B, four arms 23b (first arms) extending outward in the radial direction X from the fitting portion 23a at equal intervals in the circumferential direction Y, and first split coil portions 23c connected to the outside of each arm portion 23b in the radial direction X and extending in an arc shape to one side in the circumferential direction Y.

[0023] A slit 23S is formed between adjacent first split coil portions 23c in the circumferential direction Y. The first split coil portions 23c are not electrically connected in the circumferential direction Y. Therefore, the current flowing through the movable electrode bar 4B branches into the four arms 23b, and the branched current flows in the same circumferential direction Y through the arc-shaped first split coil portions 23c.

[0024] The first split coil portion 23c is provided with a countersunk portion 23z (first countersunk portion) recessed toward the lower Z- side in the axial direction Z. Due to the countersunk portion 23z, the thickness of the first split coil portion 23c in the axial direction Z is thicker on the outer side in the radial direction X than on the inner side.

[0025] FIG. 4A is a bottom view of the second coil 24. FIG. FIG. 4B is a top view of the second coil 24. FIG. FIG. 4C is a perspective view of the second coil 24, as viewed from the lower Z- side in the axial direction Z.

[0026] The second coil 24 has a disk-shaped contact point portion 24a, four arm portions 24b (second arm portions) extending outward in the radial direction X from the contact point portion 24a at equal intervals in the circumferential direction Y, and second split coil portions 24c connected to the outer side of each arm portion 24b in the radial direction X and extending in an arc shape on one side in the circumferential direction Y. Here, the direction in which the second split coil portion 24c extends from the arm portion 24b in the circumferential direction Y is opposite to the direction in which the first split coil portion 23c of the first coil 23 extends in the circumferential direction Y when the first coil 23 and the second coil 24 are combined in the axial direction Z as shown in FIG. 2 (see FIGS. 3 and 4B).

[0027] The second split coil portion 24c has a first coil contact portion 24d at its tip, which protrudes downward Z-side in the axial direction Z and outward in the radial direction X further than other portions of the second split coil portion 24c. The first coil contact portion 24d is a portion that is electrically connected in the axial direction Z and radial direction X to the tip of the first split coil portion 23c of the first coil 23 in the circumferential direction Y when the first coil 23 and the second coil 24 are combined as shown in FIG.

[0028] Between adjacent second split coil portions 24c in the circumferential direction Y, slits 24S are formed which extend in the radial direction X along the arms 24b and extend in an arc shape along the inner circumferential surface of the second split coil portions 24c from the bases of the arms in the circumferential direction Y. Therefore, the current flowing from the four first coil contact portions 24d of the second coil 24 passes through the respective arc-shaped second split coil portions 24c and arms 23b and joins the contact portion 24a.

[0029] Further, the upper end surface of the second split coil portion 24c has a flange-shaped protruding portion 24e (first protruding portion) that protrudes outward in the radial direction X.

[0030] The contact point contact portion 24a and the arm portion 24b protrude upward in the axial direction Z beyond the second split coil portion 24c and are in contact with the contact point 21. The slit 24S extends in an arc shape between the contact point contact portion 24a and the second split coil portion 24c. Therefore, the second split coil portion 24c does not contact the contact point 21 located on the upper Z+ side in the axial direction Z, either in the axial direction Z or in the radial direction X.

[0031] 5 is a diagram showing the combined state of the first coil 23 and the second coil 24 as viewed from the upper Z+ side in the axial direction Z. In Fig. 5, the configuration of the second coil 24 and the first coil 23 on the lower Z- side in the axial direction Z are depicted by dashed lines. Fig. 6A is a cross-sectional view of the movable side electrode 20B taken along line AA in Fig. 5. Fig. 6B is a cross-sectional view of the movable side electrode 20B taken along line BB in Fig. 5. FIG. 7A is a bottom view of contact 21. FIG. FIG. 7B is a perspective view of the contact 21, as viewed from the lower Z- side in the axial direction Z. FIG.

[0032] As shown in the hatched portion of Figure 5, the outer surface 24d1 and the bottom surface 24d2 of the first coil contact portion 24d of the second coil 24 are fixed to the side surface 23z1 and the bottom surface 23z2 of the countersunk portion 23z of the first coil 23 in a manner aligned with the slit 23S of the first coil 23.

[0033] As shown in FIG. 4C, the first coil contact portion 24d of the second coil 24 protrudes outward in the radial direction X and downward in the axial direction Z from other portions of the second split coil portion 24c, so that the second split coil portion 24c of the second coil 24 (excluding the first coil contact portion 24d) and the first split coil portion 23c of the first coil 23 are spaced apart in the radial direction X and the axial direction Z, and a space S3 (first space) shown in FIG. 6B is formed in the radial direction X and the axial direction Z between the first split coil portion 23c of the first coil 23 and the second split coil portion 24c of the second coil 24. As a result, the first coil 23 and the second coil 24 connected by the first coil contact portion 24d of the second coil 24 form four independent current paths CR shown in FIG. 5. The four current paths CR do not come into contact with each other in either the axial direction Z or the radial direction X.

[0034] 7A and 7B has a countersunk portion 21a on its surface on the axial Z- side, and a contact point 24a of the second coil 24 and an arm portion 24b formed flush with the contact point 24a are fixed in the countersunk portion 21a in the axial direction Z and the radial direction X. The contact point 24a and the arm portion 24b protrude upward in the axial direction Z toward the Z+ side beyond the second split coil portion 24c of the second coil 24, so that a space S4 (second space) shown in FIG. 6 is formed between the second split coil portion 24c and the lower surface of the contact point 21.

[0035] An umbrella-shaped reinforcing part 22 having a disk part 22a and a support part 22b is provided between the first coil 23 and the second coil 24 in order to reinforce the contact point 21. The support part 22b of the reinforcing part 22 is fixed to the movable electrode bar 4B, and the disk part 22a is disposed so as to contact the lower surface of the contact point contact part 24a of the second coil 24 in the axial direction Z, thereby reinforcing the contact point 21.

[0036] By configuring the vacuum valve 100 in this manner, the current flowing from the movable electrode bar 4B to the first coil 23 via the fitting portion 23a of the first coil 23 passes from the arm portion 23b through the first split coil portion 23c of the first coil 23, passes through the first coil contact portion 24d of the second coil 24 through the second split coil portion 24c of the second coil 24, and then passes from the arm portion 24b through the contact contact portion 24a to the contact 21. Therefore, the length of the coil includes not only the first split coil portion 23c of the first coil 23 but also the second split coil portion 24c of the second coil 24 as shown in Fig. 5, so the current flow path CR becomes longer.

[0037] In addition, the first split coil portion 23c of the first coil 23 is positioned on the downward Z-side in the axial direction Z of the arm portion 24b connected to the contact contact portion 24a of the second coil 24, so that current flowing through another current path CR passes in the circumferential direction Y on the downward Z-side in the axial direction Z of the portion where power is supplied to the contact 21.

[0038] Here, as shown in FIG. 3, the outer diameter of the first coil 23 is a, the countersunk diameter of the countersunk portion 23z of the first coil 23 is b, and as shown in FIG. 4A, the outer diameter of the protruding portion 24e of the second coil 24 is c, the outer diameter of the first coil contact portion 24d of the second coil 24 is d, and the outer diameter of the second split coil portion 24c other than the first coil contact portion 24d is e, the relationships a≧c and b=d>e must hold.

[0039] In addition, if the diameter of the countersunk portion 21a on the back surface of the contact 21 is g as shown in Fig. 7A, and the outer diameter of the contact contact portion 24a and the arm portion 24b of the second coil 24 is f as shown in Fig. 4B, then f = g for the sake of assembly. It goes without saying that the edges of each portion may be rounded or tapered for machining purposes.

[0040] FIG. 28 is a perspective view of a movable-side electrode 820B as a comparative example. This configuration is similar to the movable-side electrode 20B of the first embodiment with the second coil 24 removed. 28, the movable-side electrode 820B includes a spiral ring-shaped coil electrode 823, a disk-shaped contact point 21, and a reinforcing part 22 that reinforces the contact point 21. The coil electrode 823 and the reinforcing part 22 are fixed to the movable-side electrode bar 4B.

[0041] FIG. 29 is a top view of the coil electrode 823. The coil electrode 823 has a fitting portion 823a at its center, which is fitted into and fixed to a fitting portion 4Ba of the movable electrode bar 4B.

[0042] The coil electrode 823 has at its center an annular fitting portion 23a to which the movable-side electrode bar 4B is fixed, four arms 823b extending from the fitting portion 23a toward the outside in the radial direction X at equal intervals in the circumferential direction Y, and split coil portions 823c extending in an arc shape from the outside in the radial direction X of each of the arms 823b to one side in the circumferential direction Y. In addition, the split coil portion 823c has a power supply portion 823d at its tip that protrudes upward in the axial direction Z to the Z+ side and is connected to the contact 21.

[0043] A slit 23S is formed between the split coil portions 823c adjacent to each other in the circumferential direction Y. The split coil portions 823c are not electrically connected in the circumferential direction Y. Therefore, the current flowing through the movable electrode bar 4B branches into the four arms 823b, and the branched current flows through the arc-shaped split coil portions 823c in the same circumferential direction Y and joins the contact 21 via each power supply portion 823d. In other words, the current flowing from the movable electrode bar 4B passes through the current path 8CR shown in FIG. 29 and is supplied to the contact 21 via the power supply portion 823d.

[0044] The split coil portion 823c is disposed in the circumferential direction Y along the outer peripheral edge of the lower surface of the axial direction Z of the contact 21. In a vacuum valve incorporating such a coil electrode 823, when a current flows through the coil electrode 823, a magnetic field is generated in the axial direction Z according to the right-handed screw rule, and an arc that inevitably occurs between the contacts when breaking the current is confined within the diameter of the contact 21 and diffused to the surface of the contact 21, thereby reducing the current density on the surface of the contact 21, thereby breaking the current.

[0045] According to the vacuum valve 100 of the first embodiment, compared to the comparative example, A vacuum valve having a pair of electrodes arranged axially opposite each other in a vacuum vessel and movable toward and away from each other by means of electrode rods, At least one of the electrodes has a coil installed on the electrode rod and a contact connected to the coil, The coil is formed by combining a first coil and a second coil in the axial direction, The first coil has an annular fitting portion that is fitted with the electrode bar, a plurality of first arm portions extending radially outward from the fitting portion; and a plurality of first split coil portions connected to the radially outer sides of the first arm portions and extending in an arc shape in one circumferential direction, the second coil has a disk-shaped contact portion that contacts the contact point, a plurality of second arm portions that extend radially outward from the contact portion, and a plurality of second split coil portions that are connected to the radially outer sides of the second arm portions and extend in an arc shape in the other circumferential direction, The first coil and the second coil are each formed with a plurality of current paths by connecting a first coil contact portion at a circumferential end of the first split coil portion of the first coil to a circumferential end of the second split coil portion of the second coil, A first space is formed between the first split coil portion of the first coil and a portion of the adjacent second split coil portion other than the first coil contact portion, The coil's current path CR is longer than the current path 8CR in the comparative example by the length of the second split coil portion 24c, and without increasing the diameter of the electrode, it is possible to obtain a vacuum valve that efficiently achieves uniformity in magnetic flux density and an area having a magnetic flux density effective for diffusing the arc on the contact surface, called the effective magnetic field area, and thus improves current interruption performance. In addition, since a second space is formed between the second split coil portion and the underside of the contact, current passes in the circumferential direction Y on the lower Z- side of the arm portion 24b connected to the contact contact portion 24a in the axial direction Z, making it possible to generate an axial magnetic field in a location having a power supply function, thereby further expanding the effective magnetic field area and reducing the current density borne by the unit area of ​​the contact surface when the vacuum valve 100 interrupts current, thereby improving the current interruption performance. In addition, the first split coil portion is provided with a first countersunk portion that is recessed downward in the axial direction, and the first countersunk portion causes the axial thickness of the first split coil portion to be thicker on the radially outer side than on the radially inner side, The first coil contact portion of the second coil contacts the circumferential tip of the first split coil portion in the axial and radial directions, and the first space is formed between the first split coil portion and the second split coil portion in the radial and axial directions, so that the axial length of the vacuum valve can be shortened by placing the second coil in the first countersunk portion. In addition, the second split coil portion of the second coil has an annular protrusion that protrudes radially outward and extends circumferentially, thereby increasing the current capacity flowing through the coil and improving the current interrupting ability.

[0046] Furthermore, in conventional vacuum valves that generate an axial magnetic field to improve interruption performance, there was a problem that eddy currents were induced in the contacts, and the magnetic field generated by the eddy currents weakened the axial magnetic field. In order to avoid eddy currents, it is known to provide radial slits in the contacts, as in Patent Document 1, but the slits that penetrate the contacts cause a new problem in that they become weak points in the voltage resistance performance between axially opposed contacts, especially in vacuum valves used in high rated voltage classes.

[0047] Although a method of providing a radial groove that does not penetrate the contact on the coil electrode side of the contact is also known, the groove needs to be carefully machined with a small blade, which causes the contact manufacturing process to take time and be expensive. However, by forming the space S4 as in this embodiment, it becomes difficult for current to flow in the circumferential direction Y from the contact contact portion 24a of the second coil 24, and it is possible to suppress the eddy current flowing in the contact 21 while avoiding the deterioration of the withstand voltage performance caused by providing a slit in the contact.

[0048] Suppressing eddy currents improves the magnetic field strength and effective magnetic field area, further improving the interruption performance of the vacuum valve 100. Also, improving the interruption performance of the vacuum valve 100 makes it possible to interrupt a larger current, which contributes to the vacuum valve 100 being able to handle a larger current. Also, expanding the effective magnetic field area promotes arc diffusion on the surface of the contacts 21, further reducing thermal damage to the surface of the contacts 21, improving the interruption life of the vacuum valve 100 and enabling it to be used in a wider range of applications, such as for multiple interruption specifications.

[0049] In addition, compared to conventional coil electrodes, the area required for effective magnetic flux density can be secured with a smaller diameter, so the diameter of the coil electrode can be made smaller. As the diameter of the coil electrode is made smaller, the diameters of other parts of the vacuum valve 100 can also be made smaller, which contributes to making the entire vacuum valve 100 smaller in diameter and lighter in weight. Naturally, making the vacuum valve 100 smaller in diameter and lighter in weight can reduce the cost of the vacuum valve 100.

[0050] Furthermore, by providing the protrusion 24e of the second coil 24 and establishing the relationship a≧c, the electric field is alleviated, the current carrying capacity is increased, and the current carrying performance of the vacuum valve 100 is improved.

[0051] Embodiment 2 The vacuum interrupter according to the second embodiment will be described below, focusing on the differences from the first embodiment. FIG. 8A is a bottom view of the second coil 224. FIG. FIG. 8B is a top view of the second coil 224. FIG. 9A is a bottom view of contact 221. FIG. FIG. 9B is a perspective view of the contact 221, as viewed from the lower Z- side in the axial direction Z. FIG. The vacuum valve 100 according to the second embodiment differs from the vacuum valve 100 described in the first embodiment only in the configurations of the contacts 21 and the second coil 24.

[0052] As shown in FIGS. 8A and 8B , like the second coil 24 shown in embodiment 1, the second coil 224 has a disk-shaped contact portion 224a, four arms 24b extending from the contact portion 224a toward the outside in the radial direction X at equal intervals in the circumferential direction Y, and second split coil portions 24c extending in an arc shape from the outside in the radial direction X of each of the arms 24b to one side in the circumferential direction Y.

[0053] Additionally, the second split coil portion 24c has at its tip a first coil contact portion 24d that protrudes downward Z-side in the axial direction Z and outward in the radial direction X further than other portions of the second split coil portion 24c. The first coil contact portion 24d is a portion that comes into contact with and is electrically connected to the tip of the first split coil portion 23c of the first coil 23 in the circumferential direction Y in the axial direction Z and radial direction X when the first coil 23 and the second coil 224 are combined.

[0054] The second coil 224 differs from the second coil 24 of the first embodiment in that the second coil 224 has a thin cylindrical countersunk portion 224z (second countersunk portion) coaxial with the movable-side electrode bar 4B on the upper surface of the axial direction Z of the contact contact portion 224a, as shown in Fig. 8B. Also, as shown in Figs. 9A and 9B, the contact 221 has a thin cylindrical protruding portion 221P (second protruding portion) at the center of the lower surface in the axial direction Z, which protrudes toward the downward Z- side in the axial direction Z and is coaxial with the movable-side electrode bar 4B.

[0055] Fig. 10A and Fig. 10B are cross-sectional views of the movable-side electrode 220B, Fig. 10A corresponds to Fig. 6A of the first embodiment, and Fig. 10B corresponds to Fig. 6B of the first embodiment. As shown in FIG. 10, the protrusion 221P of the contact 21 is fitted into the countersunk portion 224z of the second coil 224, so that the center position of the contact 221 is determined by the countersunk portion 224z of the second coil 224, not by the outer peripheral surface of the contact contact portion 224a of the second coil 224.

[0056] Fig. 11A is a bottom view showing a modified example of second coil 224. Fig. 11B is a top view showing a modified example of second coil 224. Fig. 12A and Fig. 12B are cross-sectional views of the movable-side electrode 220B. Fig. 12A corresponds to Fig. 6A of the first embodiment, and Fig. 12B corresponds to Fig. 6B of the first embodiment. 11A and 11B, a through hole 224H may be provided instead of the countersunk portion 224z of the contact contact portion 224a of the second coil 224. As shown in Fig. 12A and 12B, the center position of the contact 221 is determined by fitting the protruding portion 221P of the contact 221 into the through hole 224H of the second coil 224.

[0057] In the second embodiment, as in the first embodiment, the length of the coil is determined not only by the length of the first split coil portion 23c of the first coil 23 but also by the length of the second split coil portion 24c of the second coil 224, so that the current path of the coil is longer.

[0058] Here, assuming that the countersunk diameter of countersunk portion 224z of second coil 24 is h as shown in Fig. 8 and that the outer diameter of protruding portion 221P of contact 221 is i as shown in Fig. 9, then from the relationship in terms of assembly, h = i. Furthermore, assuming that the hole diameter of through hole 224H of second coil 224 is j as shown in Fig. 11B, then j = i. Furthermore, it goes without saying that the edges of each portion may be rounded or tapered in terms of processing.

[0059] According to the vacuum valve 100 of the second embodiment, The contact contact portion of the second coil has a second countersunk portion on an upper surface in the axial direction and coaxial with the electrode rod, and the contact has a cylindrical second protruding portion on a lower surface in the axial direction and coaxial with the electrode rod, and the second protruding portion is fitted into the second countersunk portion, or The contact contact portion of the second coil has a through hole coaxial with the electrode rod, and the contact has a cylindrical second protrusion on the lower surface in the axial direction coaxial with the electrode rod, and the second protrusion is fitted into the through hole. This provides the same effects as in embodiment 1. Also, since it is no longer necessary to position the center of the contact 221 on the outer periphery of the contact contact portion 224a of the second coil 224, the distance between the first coil 23 and the second coil 224 and the surface of the contact 221 can be shortened by reducing the thickness of the second coil 224 in the axial direction Z, improving the magnetic flux density and effective magnetic field area on the surface of the contact 221, and further improving the current interruption performance of the vacuum valve 100.

[0060] Embodiment 3 The vacuum interrupter according to the third embodiment will be described below, focusing on the differences from the first embodiment. FIG. 13A is a bottom view of second coil 324. FIG. FIG. 13B is a top view of the second coil 324. The vacuum valve 100 according to the third embodiment differs from the vacuum valve 100 described in the first embodiment only in the configuration of the second coil 324.

[0061] 13A and 13B, like the second coil 24 described in embodiment 1, the second coil 324 has a disk-shaped contact portion 324a, four arms 24b extending from the contact portion 324a toward the outside in the radial direction X at equal intervals in the circumferential direction Y, and second split coil portions 24c extending in an arc shape from the outside of each arm in the radial direction X to one side in the circumferential direction Y.

[0062] The second coil 324 has a contact-side slit 24S2 in a contact contact portion 324a, the contact side slit 24S2 communicating with the slit 24S and extending inward in the radial direction X from the base portion of the second split coil portion 24c.

[0063] Fig. 14 is a diagram showing the combined state of the first coil 23 and the second coil 324 as viewed from the upper Z+ side in the axial direction Z. In Fig. 14, the configuration of the second coil 324 on the lower Z- side in the axial direction Z and the first coil 23 are depicted by dashed lines. The vacuum valve 100 according to the third embodiment provides the same effects as the first embodiment. The contact point portion of the second coil has a contact point side slit 24S2 extending radially inward from a base portion of the second split coil portion. That is, as shown in FIG. 14, the second coil 324 has a contact side slit 24S2 that is continuous with the slit 24S, so that when power is supplied from the contact contact portion 324a of the second coil 324 to the contact 21, the current flowing on the contact 21 can be prevented from flowing in the opposite direction to the current path of the first split coil portion 23c and the second split coil portion 24c.

[0064] In this way, when power is supplied from the contact contact portion 324a of the second coil 324 to the contact 21, the contact side slit 24S2 prevents the current flowing on the contact 21 from flowing in the opposite direction to the coil's current path CR, thereby improving the magnetic flux density and effective magnetic field area compared to embodiment 1 and further improving the current interruption performance of the vacuum valve 100.

[0065] Moreover, it goes without saying that this embodiment may be provided with the countersunk portion 224z or the through hole 224H of the second coil 224 shown in the embodiment 2. It goes without saying that the edges of each portion may be processed to have a rounded shape or a tapered shape.

[0066] Embodiment 4 The vacuum interrupter according to the fourth embodiment will be described below, focusing on the differences from the first embodiment. FIG. 15 is an exploded perspective view showing the configuration of the movable-side electrode 420B. FIG. 16A is a bottom view of the second coil 424. FIG. FIG. 16B is a top view of the second coil 424. Fig. 17 is a diagram showing the combined state of the first coil 23 and the second coil 424 as viewed from the upper Z+ side in the axial direction Z. In Fig. 17, the configuration of the second coil 424 on the lower Z- side in the axial direction Z and the first coil 23 are depicted by dashed lines. The vacuum valve 100 according to the fourth embodiment differs from the vacuum valve 100 described in the first embodiment only in the configuration of the second coil 424.

[0067] 16A and 16B, like the second coil 24 shown in embodiment 1, the second coil 424 has a disk-shaped contact portion 24a, four arms 424b extending from the contact portion 24a toward the outside in the radial direction X at equal intervals in the circumferential direction Y, and second split coil portions 424c extending in an arc shape from the outside of each arm in the radial direction X to one side in the circumferential direction Y.

[0068] Fig. 18A is a cross-sectional view of the movable-side electrode 420B taken along line AA in Fig. 17. Fig. 18B is a cross-sectional view of the movable-side electrode 420B taken along line BB in Fig. 17. The second coil 424 according to the fourth embodiment does not have the protruding portion 24e that the second coil 24 according to the first embodiment has. Therefore, as shown in Fig. 15, Fig. 18A and Fig. 18B, when viewed from the axial direction Z, the second coil 424 does not have a portion that protrudes outward in the radial direction X relative to the first coil 23. In addition, the length in the axial direction Z of the second split coil portion 424c is also shorter than that of the second split coil portion 24c according to the first embodiment.

[0069] In the fourth embodiment, as in the first embodiment, the length of the coil is not only the length of the first split coil portion 23c of the first coil 23 but also the length of the second split coil portion 424c of the second coil 424, so that the current path CR of the coil is longer. However, since there is no protrusion 24e of the second coil 424, the current capacity is reduced compared to the first embodiment, but on the other hand, the length of the axial direction Z of the second split coil portion 424c is also shortened by the amount corresponding to the absence of the protrusion 24e of the second coil 424, and the distance from the first coil 23 to the surface of the contact 21 is shortened.

[0070] Here, if the countersink diameter of the countersink portion 23z of the first coil 23 is b as shown in Figure 3, the outer diameter of the first coil contact portion 424d of the second coil 424 is d as shown in Figure 16A, and the outer diameter of the second split coil portion 24c of the second coil 424 is e, then for assembly reasons, the relationship b≧d>e must be satisfied.

[0071] The vacuum valve 100 according to the fourth embodiment provides the same effects as the first embodiment. Also, as described above, since the second coil 424 does not have the protrusion 24e, the current-carrying capacity is reduced compared to embodiment 1. However, since the distance between the first coil 23 and the surface of the contact 21 is shortened, the magnetic flux density and the effective magnetic field area on the surface of the contact 21 are improved.

[0072] In addition to this embodiment, it goes without saying that the countersunk portion 224z or the through hole 224H of the second coil 224 shown in embodiment 2, and the contact side slit 24S2 of the second coil 324 shown in embodiment 3 may be provided. It goes without saying that the edges of each portion may be rounded or tapered.

[0073] Embodiment 5. The vacuum interrupter according to the fifth embodiment will be described below, focusing on the differences from the first embodiment. FIG. 19 is an exploded perspective view showing the configuration of the movable side electrode 520B. FIG. 20 is a top view of the first coil 523. As shown in FIG. FIG. 21A is a bottom view of the second coil 524. FIG. FIG. 21B is a top view of the second coil 524. FIG. 21C is a perspective view of the second coil 524, as viewed from the lower Z- side in the axial direction Z. FIG. FIG. 21D is a side view of the second coil 524. Fig. 22 is a diagram showing the combined state of first coil 523 and second coil 524 as viewed from the upper Z+ side in the axial direction Z. In Fig. 22, the configuration of second coil 524 on the lower Z- side in the axial direction Z and first coil 523 are depicted by dashed lines. Fig. 23A is a cross-sectional view of the movable-side electrode 520B taken along line AA in Fig. 22. Fig. 23B is a cross-sectional view of the movable-side electrode 520B taken along line BB in Fig. 22.

[0074] The vacuum valve 100 of this embodiment 5 differs from the vacuum valve 100 described in embodiment 1 in that the first coil 23 is replaced with a cup-shaped first coil 523 and the shape of the second coil 524.

[0075] 19, the first coil 523 has a bottomed cup shape and is made up of a cylindrical portion 523A and a bottom portion 523B. A fitting portion 523a that fits with the movable-side electrode bar 4B is provided in the center of the bottom portion 523B, and is fitted and fixed with a fitting portion 4Ba of the movable-side electrode bar 4B shown in FIG.

[0076] In the cylindrical portion 523A, a plurality of inclined slits 523AS (four in this example) are provided obliquely with respect to the axial direction Z, forming a plurality of arc-shaped first divided coil portions 523c. The lower ends of the inclined slits 523AS in the axial direction Z are smoothly connected to bottom slits 523BS provided in the bottom portion 523B. An annular countersunk portion 523z is provided on the inside of the first divided coil portion 523c. The portion between the bottom slits 523BS adjacent to each other in the circumferential direction Y of the bottom portion 523B is the arm portion 523b shown in FIG. 20, which corresponds to the arm portion 23b in the first embodiment.

[0077] 21A, the second coil 524 includes a contact point portion 24a, an arm portion 24b, a second split coil portion 524c, a first coil contact portion 524d, and a slit 24S, similar to the second coil 24 described in embodiment 1. The lower surface of the first coil contact portion 524d includes a tapered portion 524t whose thickness in the axial direction Z gradually decreases toward the side from which the current flows.

[0078] As shown in FIG. 22, an outer surface 524d1 and a bottom surface 524d2 of the first coil contact portion 524d of the second coil 524 are fixed to a side surface 523z1 and a bottom surface 523z2 of the countersunk portion 523z of the first coil 523 in a manner aligned with the slit 23S of the first coil 23.

[0079] More specifically, the second coil 524 is fixed to the side of the countersunk portion 523z of the first coil 523 at a position along the inclined slit 523AS of the first coil 523, at the end of the first split coil portion 523c of the first coil 523 on the contact 21 side (see Figure 21D).

[0080] 21C, the first coil contact portion 524d of the second coil 24 protrudes outward in the radial direction X and downward in the axial direction Z than other portions of the second split coil portion 524c, so that the second split coil portion 524c (excluding the first coil contact portion 524d) of the second coil 524 and the first split coil portion 23c of the first coil 523 are spaced apart in the radial direction X and the axial direction Z, and a space S3 shown in FIG. 23B is formed in the radial direction X and the axial direction Z between the first split coil portion 23c of the first coil 523 and the second split coil portion 524c of the second coil 524. As a result, the first coil 523 and the second coil 524 connected by the first coil contact portion 524d of the second coil 524 form independent current paths CR shown in FIG. 22, and at the same time, the four current paths CR do not come into contact with each other in either the axial direction Z or the radial direction X.

[0081] 7A and 7B, the contact 21 has a countersunk portion 21a on its surface on the negative axial direction Z side, and the contact contact portion 24a of the second coil 524 and the arm portion 24b formed flush with the contact contact portion 24a are fixed in the countersunk portion 21a in the axial direction Z and the radial direction X. The contact contact portion 24a and the arm portion 24b protrude upward in the axial direction Z beyond the second split coil portion 524c of the second coil 24, and therefore a space S4 shown in FIG. 23A is formed between the second split coil portion 524c and the lower surface of the contact 21.

[0082] According to the vacuum valve 100 of embodiment 5, as in embodiment 1, the current flowing from the movable side electrode rod 4B flows through the fitting portion 523a of the first coil 523 to the first split coil portion 523c of the first coil 523, through the first coil contact portion 524d of the second coil 524 to the second split coil portion 524c, and then flows through the contact contact portion 24a and the arm portion 24b to the contact 21, following the current path CR shown in FIG. 22.

[0083] In addition, the first split coil portion 523c of the first coil 23 is arranged on the downward Z-side in the axial direction Z of the arm portion 24b connected to the contact contact portion 24a of the second coil 24, so that the current flowing through another current path CR passes in the circumferential direction Y on the downward Z-side in the axial direction Z of the portion where power is supplied to the contact 21.

[0084] Here, as shown in FIG. 22, the outer diameter of the first coil 523 is k, the countersunk diameter of the countersunk portion 523z of the first coil 523 is m, and as shown in FIG. 21A, the outer diameter of the protrusion 24e of the second coil 24 is c, the outer diameter of the first coil contact portion 524d of the second coil 524 is d, and the outer diameter of the second split coil portion 524c other than the first coil contact portion 524d is e, then the relationships k≧c and m=d>e must hold. In addition, as shown in FIG. 7A, the diameter of the countersunk portion 21a on the back surface of the contact 21 is g, and as shown in FIG. 21B, the outer diameter of the contact contact portion 24a and the arm portion 24b of the second coil 524 is f, then for assembly reasons, f=g.

[0085] If the angle of the inclined slit 523AS of the first coil 523 with respect to a plane perpendicular to the axial direction Z is α, and the taper angle of the tapered portion 524t of the second coil 524 with respect to a plane perpendicular to the axial direction Z is β as shown in FIG. 21D, it is desirable to set α=β.

[0086] Needless to say, this embodiment may also be provided with the countersunk portion 224z or through hole 224H of the second coil 224 shown in embodiment 2. Needless to say, this embodiment may also be provided with the contact-side slit 24S2 of the second coil 24 shown in embodiment 3. Needless to say, the edges of each portion may be rounded or tapered.

[0087] FIG. 30 is a perspective view of a cup-shaped movable-side electrode 920B as a comparative example. FIG. 31 is a side view of a coil electrode serving as a comparative example. The cup-shaped movable-side electrode 920B is an example of an electrode that generates a magnetic field in the axial direction Z according to the right-hand screw rule and effectively blocks current. The movable-side electrode 920B has a configuration similar to that of the movable-side electrode 520B of the fifth embodiment, except that the second coil 524 is removed.

[0088] 30, the coil electrode 923 is in the shape of a cup with a bottom, and is made up of a cylindrical portion 923A and a bottom portion 923B. A fitting portion 923a that fits with the movable electrode bar 4B is provided in the center of the bottom portion 923B, and is fixed by fitting with the fitting portion 4Ba of the movable electrode bar 4B.

[0089] In the cylindrical portion 923A, a plurality of inclined slits 923AS (four in this example) are provided at an angle with respect to the axial direction Z, forming a plurality of arc-shaped split coil portions 923c. The lower ends of the inclined slits 923AS in the axial direction Z are smoothly connected to bottom slits 923BS provided in the bottom portion 923B. The portion between the bottom slits 923BS adjacent to each other in the circumferential direction Y of the bottom portion 923B is the arm portion 923b corresponding to the arm portion 23b of the first embodiment. The split coil portion 923c has a power supply portion 923d at its tip that protrudes upward in the axial direction Z+ and is connected to the contact 21.

[0090] With this structure, the current flowing from the movable electrode bar 4B passes through the current path 9CR shown in FIG. 31, and is supplied to the contact 21 via the power supply part 923d.

[0091] Even in a vacuum interrupter incorporating the movable electrode 920B as described above, when a current flows through the cup-shaped coil electrode 923, an axial magnetic field is generated according to the right-hand rule, which reduces the current density at the time of current interruption and effectively interrupts the current.

[0092] On the other hand, according to the vacuum valve 100 of the fifth embodiment, compared to the comparative example, The first coil comprises a cylindrical portion and a bottom portion, The cylindrical portion has a plurality of inclined slits that are obliquely provided with respect to the axial direction, and the first split coil portion is formed by the inclined slits. In addition to the coil's current path CR being longer than in the comparative example shown in Figures 30 and 31, the current passes in the circumferential direction Y on the lower Z- side of the arm portion 24b connected to the contact contact portion 24a in the axial direction Z, making it possible to generate an axial magnetic field in the portion having the power supply function, thereby expanding the area having a magnetic flux density effective for diffusing the arc on the contact surface, called the effective magnetic field area, and reducing the current density borne by the unit area of ​​the contact surface when the vacuum valve 100 interrupts current, thereby improving the current interruption performance.

[0093] Furthermore, in conventional vacuum valves that generate an axial magnetic field to improve interruption performance, there was a problem that eddy currents were induced in the contacts, and the magnetic field generated by the eddy currents weakened the axial magnetic field. In order to avoid eddy currents, it is known to provide radial slits in the contacts, as in Patent Document 1, but the slits that penetrate the contacts cause a new problem in that they become weak points in the voltage resistance performance between contacts facing each other in the axial direction Z, especially in vacuum valves used in high rated voltage classes.

[0094] Although a method of providing a radial groove that does not penetrate the contact on the coil electrode side of the contact is also known, there is a problem that the contact manufacturing process takes time and is expensive because the groove needs to be carefully processed with a small blade. However, in this embodiment, by forming the space S4 shown in Fig. 23A, it becomes difficult for a current to flow in the circumferential direction Y from the contact contact portion 24a of the second coil 524, and it is possible to suppress the eddy current flowing in the contact 21 while avoiding the deterioration of the withstand voltage performance caused by providing a slit in the contact.

[0095] Suppressing eddy currents improves the magnetic field strength and effective magnetic field area, further improving the interruption performance of the vacuum valve 100. Also, improving the interruption performance of the vacuum valve 100 makes it possible to interrupt a larger current, which contributes to the vacuum valve 100 being able to handle a larger current. Also, expanding the effective magnetic field area promotes arc diffusion on the surface of the contacts 21, further reducing thermal damage to the surface of the contacts 21, improving the interruption life of the vacuum valve 100 and enabling it to be used in a wider range of applications, such as for multiple interruption specifications.

[0096] In addition, compared to conventional coil electrodes, the area required for effective magnetic flux density can be secured with a smaller diameter, so the diameter of the coil electrode can be made smaller. As the diameter of the coil electrode is made smaller, the diameters of other parts of the vacuum valve 100 can also be made smaller, which contributes to making the entire vacuum valve 100 smaller in diameter and lighter in weight. Naturally, making the vacuum valve 100 smaller in diameter and lighter in weight can reduce the cost of the vacuum valve 100.

[0097] Furthermore, by providing the protrusion 24e of the second coil 24 and establishing the relationship k≧c, the electric field can be alleviated, the current carrying capacity can be increased, and the current carrying performance of the vacuum valve 100 can be improved. Furthermore, since the bottom portion has a plurality of bottom slits that communicate with the inclined slits and form the first arm portion, the length of the coil can be further increased. The lower surface of the first coil contact portion has a tapered portion in which the axial thickness decreases toward the side from which the current flows, so that the first coil 523 and the second coil 524 can be connected along the inclined slit. Furthermore, if the angle of the inclined slit of the first coil with respect to a plane perpendicular to the axial direction is α, and the taper angle of the tapered portion of the second coil with respect to a plane perpendicular to the axial direction is β, then α = β, and therefore the distance between the first coil and the second coil can be made equal, ensuring a smooth current path CR.

[0098] Embodiment 6 The vacuum interrupter according to the sixth embodiment will be described below, focusing on the differences from the fifth embodiment. FIG. 24 is an exploded perspective view showing the configuration of the movable side electrode 620B. FIG. 25A is a bottom view of the second coil 624. FIG. FIG. 25B is a top view of the second coil 624. FIG. 25C is a perspective view of the second coil 624, as viewed from the lower Z- side in the axial direction Z. FIG. FIG. 25D is a side view of the second coil 624. Fig. 26 is a diagram showing the combined state of first coil 523 and second coil 624 as viewed from the upper Z+ side in the axial direction Z. In Fig. 26, the configuration of second coil 624 on the lower Z- side in the axial direction Z and the invisible parts of first coil 523 are depicted by dashed lines. The vacuum valve 100 according to the sixth embodiment differs from the vacuum valve 100 described in the fifth embodiment only in the configuration of the second coil 624.

[0099] 25A and 25B, like the second coil 524 shown in embodiment 5, the second coil 624 has a disk-shaped contact portion 24a, four arms 24b extending from the contact portion 24a toward the outside in the radial direction X at equal intervals in the circumferential direction Y, and second split coil portions 624c extending in an arc shape from the outside of each arm in the radial direction X to one side in the circumferential direction Y.

[0100] Fig. 27A is a cross-sectional view of the movable-side electrode 620B taken along line AA in Fig. 26. Fig. 27B is a cross-sectional view of the movable-side electrode 620B taken along line BB in Fig. 26. The second coil 624 according to the sixth embodiment does not have the protruding portion 24e that the second coil 524 according to the fifth embodiment has. Therefore, as shown in Figs. 24 to 27B, when viewed from the axial direction Z, the second coil 624 does not have a portion that protrudes outward in the radial direction X relative to the first coil 23. In addition, the length of the second split coil portion 624c in the axial direction Z is also shortened.

[0101] The second coil 624 is the same as in embodiment 5 in that the inclined surface 624t1 of the tapered portion 624t of the second coil 524 is fixed to the side of the countersunk portion 523z of the first coil 523 at a position along the inclined slit 523AS of the first coil 523 at the end of the first split coil portion 523c of the first coil 523 on the contact 21 side.

[0102] In the sixth embodiment, as in the fifth embodiment, the length of the coil is not only the length of the first split coil portion 23c of the first coil 523 but also the length of the second split coil portion 624c of the second coil 624, so that the current path CR of the coil is longer. However, since there is no protrusion 24e of the second coil 624, the current capacity is reduced compared to the fifth embodiment, but on the other hand, since there is no protrusion 24e of the second coil 424 and the length of the second split coil portion 624c in the axial direction Z is shorter than that of the second split coil portion 524c of the fifth embodiment, the distance from the first coil 523 to the surface of the contact 21 is shorter.

[0103] Here, if the countersink diameter of countersink portion 523z of first coil 523 is m as shown in Figure 26, the outer diameter of first coil contact portion 624d of second coil 624 is d as shown in Figure 25A, and the outer diameter of second split coil portion 624c of second coil 624 is e, then for assembly reasons, the relationship m≧d>e must hold.

[0104] If the angle of the inclined slit 523AS of the first coil 523 with respect to a plane perpendicular to the axial direction Z is α, and the taper angle of the tapered portion 624t of the second coil 24 with respect to a plane perpendicular to the axial direction Z is β as shown in Figure 25D, it is desirable to set α = β.

[0105] Needless to say, this embodiment may also be provided with the countersunk portion 224z or through hole 224H of the second coil 224 shown in embodiment 2. Needless to say, this embodiment may also be provided with the contact-side slit 24S2 of the second coil 24 shown in embodiment 3. Needless to say, the edges of each portion may be rounded or tapered.

[0106] The vacuum interrupter 100 according to the sixth embodiment provides the same effects as the fifth embodiment. Also, as described above, since the second coil 624 does not have the protrusion 24e, the current-carrying capacity is reduced compared to embodiment 1. However, since the distance between the first coil 523 and the surface of the contact 21 is shortened, the magnetic flux density and the effective magnetic field area on the surface of the contact 21 are improved.

[0107] 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 modifications not exemplified are assumed within the scope of the technology disclosed in this disclosure, including, for example, modifying, adding, or omitting at least one component, and further, extracting at least one component and combining it with a component of another embodiment.

[0108] Various aspects of the present disclosure are summarized below as appendices.

[0109] (Appendix 1) A vacuum valve having a pair of electrodes arranged axially opposite each other in a vacuum vessel and movable toward and away from each other by means of electrode rods, At least one of the electrodes has a coil installed on the electrode rod and a contact connected to the coil, The coil is formed by combining a first coil and a second coil in the axial direction, The first coil has an annular fitting portion that is fitted with the electrode bar, a plurality of first arm portions extending radially outward from the fitting portion; and a plurality of first split coil portions connected to the radially outer sides of the first arm portions and extending in an arc shape in one circumferential direction, the second coil has a disk-shaped contact portion that contacts the contact point, a plurality of second arm portions that extend radially outward from the contact portion, and a plurality of second split coil portions that are connected to the radially outer sides of the second arm portions and extend in an arc shape in the other circumferential direction, The first coil and the second coil are each formed with a plurality of current paths by connecting a first coil contact portion at a circumferential end of the first split coil portion of the first coil to a circumferential end of the second split coil portion of the second coil, A vacuum interrupter in which a first space is formed between the first split coil portion of the first coil and a portion of the adjacent second split coil portion other than the first coil contact portion. (Appendix 2) 2. The vacuum valve according to claim 1, wherein a second space is formed between the second split coil portion and a lower surface of the contact. (Appendix 3) The vacuum valve according to claim 1 or 2, wherein the first split coil portion is provided with a first countersunk portion that is recessed downward in the axial direction, and the first countersunk portion causes the axial thickness of the first split coil portion to be thicker on the radial outside than on the radial inside. (Appendix 4) A vacuum valve as described in any one of Appendix 1 to Appendix 3, wherein the first coil contact portion of the second coil contacts a circumferential end of the first split coil portion in the axial and radial directions, and the first space is formed between the first split coil portion and the second split coil portion in the radial and axial directions. (Appendix 5) A vacuum valve as described in Appendix 4, in which the relationship b≧d>e holds, where b is the countersunk diameter of the first countersunk portion of the first coil, d is the outer diameter of the first coil contact portion of the second coil, and e is the outer diameter of the second split coil portion other than the first coil contact portion. (Appendix 6) A vacuum valve as described in any one of Supplementary Note 1 to Supplementary Note 5, wherein the second split coil portion of the second coil has an annular first protrusion portion that protrudes radially outward and extends circumferentially. (Appendix 7) 7. A vacuum valve as described in any one of Appendix 1 to Appendix 6, wherein the contact contact portion of the second coil has a second countersunk portion on its axial upper surface which is coaxial with the electrode rod, and the contact has a cylindrical second protrusion on its axial lower surface which is coaxial with the electrode rod, and the second protrusion is fitted into the second countersunk portion. (Appendix 8) A vacuum valve as described in any one of Appendix 1 to Appendix 6, wherein the contact contact portion of the second coil has a through hole coaxial with the electrode rod, and the contact has a cylindrical second protrusion on its axial lower surface coaxial with the electrode rod, and the second protrusion is fitted into the through hole. (Appendix 9) A vacuum valve as described in any one of Supplementary Note 1 to Supplementary Note 8, wherein the contact contact portion of the second coil has a contact side slit extending radially inward from a root portion of the second split coil portion. (Appendix 10) The first coil comprises a cylindrical portion and a bottom portion, 10. The vacuum valve according to claim 1, wherein the cylindrical portion has a plurality of inclined slits arranged obliquely with respect to an axial direction, and the first split coil portion is formed by the inclined slits. (Appendix 11) 11. The vacuum valve of claim 10, wherein the bottom portion has a plurality of bottom slits that communicate with the inclined slits and form the first arm portion. (Appendix 12) 12. The vacuum valve according to claim 10 or 11, wherein the lower surface of the first coil contact portion is provided with a tapered portion in which the axial thickness decreases toward the side from which the current flows. (Appendix 13) 13. A vacuum valve as described in Appendix 12, wherein α is the angle of the inclined slit of the first coil relative to a plane perpendicular to the axial direction, and β is the taper angle of the tapered portion of the second coil relative to a plane perpendicular to the axial direction, such that α=β. [Explanation of symbols]

[0110] 100 vacuum valve, 1 insulating cylinder, 3 bellows, 1M metallized layer, 2A fixed flange, 2B movable flange, G guide, 3C bellows cover, 4A fixed electrode rod, 4B movable electrode rod, 4Ba fitting portion, AS arc shield, 20A fixed electrode, 20B, 220B, 420B, 520B, 620B, 820B, 920B movable electrode, 21, 221 contact, 21a counterbore portion, 22 reinforcing part, 22a disc portion, 22b support portion, 221P protrusion portion, 23, 523 first coil, 23a, 523a, 823a, 923a fitting portion, 23b, 523b, 823b, 923b arm portion, 23c, 523c first split coil portion, 923c Split coil section, 23S, 24S Slit, 24S2 Contact side slit, 23z, 523z Counterbore section, 23z1, 523z1 Side, 23z2, 523z2 Bottom, 523A, 923A Cylindrical section, 523AS, 923AS Inclined slit, 523B, 923B Bottom, 523BS, 923BS Bottom slit, 24, 224, 324, 424, 524, 624 Second coil, 24a, 224a, 324a Contact contact section, 24b, 424b Arm section, 24c, 424c, 524c, 624c Second split coil section, 24d, 424d, 524d, 624d First coil contact section, 24d1, 524d1 Outer surface, 24d2, 524d2 Bottom surface, 24e protrusion, 24S slit, 224H through hole, 224z countersunk portion, 524t, 624t tapered portion, 524t1, 624t1 inclined surface, 823, 923 coil electrode, 823c, 923c split coil portion, 823d, 923d power supply portion, CR, 8CR, 9CR current path, S3, S4 space.

Claims

1. A vacuum valve having a pair of electrodes arranged axially opposite each other in a vacuum vessel and movable toward and away from each other by electrode rods, At least one of the electrodes has a coil installed on the electrode rod and a contact connected to the coil, The coil is formed by combining a first coil and a second coil in an axial direction, The first coil has an annular fitting portion that is fitted with the electrode rod; a plurality of first arm portions extending radially outward from the fitting portion; and a plurality of first split coil portions connected to the radially outer sides of the first arm portions and extending in an arc shape in one circumferential direction, the second coil has a disk-shaped contact portion that contacts the contacts, a plurality of second arm portions that extend radially outward from the contact portion, and a plurality of second split coil portions that are connected to the radially outer sides of the second arm portions and extend in an arc shape in the other circumferential direction, The first coil and the second coil are each formed with a plurality of current paths by connecting a first coil contact portion at a circumferential end of the first divided coil portion of the first coil to a circumferential end of the second divided coil portion of the second coil, a first space is formed between the first split coil portion of the first coil and a portion of the adjacent second split coil portion other than the first coil contact portion; A vacuum valve in which a second space is formed between the second split coil portion and a lower surface of the contact.

2. The vacuum valve according to claim 1, wherein the first split coil portion is provided with a first countersunk portion recessed axially downward, and the first countersunk portion causes the axial thickness of the first split coil portion to be thicker on the radial outside than on the radial inside.

3. A vacuum valve as described in claim 1, wherein the first coil contact portion of the second coil contacts the circumferential end of the first split coil portion in the axial and radial directions, and the first space is formed between the first split coil portion and the second split coil portion in the radial and axial directions.

4. 4. A vacuum valve as described in claim 3, wherein the relationship b≧d>e holds, where b is the countersink diameter of the first countersink portion of the first coil, d is the outer diameter of the first coil contact portion of the second coil, and e is the outer diameter of the second split coil portion other than the first coil contact portion.

5. 2. The vacuum valve according to claim 1, wherein the second split coil portion of the second coil has an annular first protruding portion that protrudes radially outward and extends circumferentially.

6. 2. A vacuum valve as described in claim 1, wherein the contact contact portion of the second coil has a second countersunk portion on its axial upper surface which is coaxial with the electrode rod, and the contact has a cylindrical second protrusion on its axial lower surface which is coaxial with the electrode rod, and the second protrusion is fitted into the second countersunk portion.

7. A vacuum valve as described in claim 1, wherein the contact contact portion of the second coil has a through hole coaxial with the electrode rod, and the contact has a cylindrical second protrusion on its axial lower surface coaxial with the electrode rod, and the second protrusion is fitted into the through hole.

8. 2. The vacuum valve according to claim 1, wherein the contact portion of the second coil has a contact side slit extending radially inward from a root portion of the second split coil portion.

9. The first coil comprises a cylindrical portion and a bottom portion, 9. The vacuum valve according to claim 1, wherein the cylindrical portion has a plurality of inclined slits that are provided obliquely with respect to an axial direction and define the first split coil portion.

10. 10. The vacuum valve according to claim 9, wherein the bottom portion has a plurality of bottom slits that communicate with the inclined slits and form the first arm portion.

11. 10. The vacuum valve according to claim 9, wherein a lower surface of the first coil contact portion is provided with a tapered portion whose axial thickness decreases toward the side from which the current flows.

12. A vacuum valve as described in claim 11, wherein α is the angle of the inclined slit of the first coil relative to a plane perpendicular to the axial direction, and β is the taper angle of the tapered portion of the second coil relative to a plane perpendicular to the axial direction, such that α = β.

Images