VACUUM VALVE

Abstract

An electrode (20B) of a vacuum valve (100) has a coil (K) provided on an electrode rod (4B). The coil (K) is formed by combining a first coil (23) and a second coil (24) in an axial direction (Z). The first coil (23) has a plurality of first coil sections (23c) extending in an arc to one side in a circumferential direction Y. The second coil (24) has a plurality of second coil sections (24c) extending in an arc to the other side in the circumferential direction Y. Distal ends of the second coil sections (24c) of the second coil (24) are connected to distal ends in the circumferential direction of the first coil sections (23c) of the first coil (23), thereby forming a plurality of current conduction paths.A first space (S3) is formed between each first coil section (23c) and a part, except for a first coil contact section (24d), of the adjacent second coil section (24c).

Description

TECHNICAL AREA

[0001] The present disclosure relates to a vacuum valve. BACKGROUND ART

[0002] A conventional vacuum valve has a vacuum reservoir, which is an insulating cylinder made of a glass material, an aluminum oxide ceramic material, or the like, and to metallization layers formed at both ends of the insulating cylinder are attached a fixed-side flange and a moving-side flange, formed of metal, such that the interior of the reservoir is kept in a highly vacuumed and hermetically sealed condition.

[0003] A fixed-side electrode rod and a moving-side electrode rod are attached to the fixed-side and moving-side flanges, which are mounted at both ends of the insulating cylinder, such that they are coaxially opposite each other. A fixed-side electrode and a moving-side electrode are attached to opposite ends of the electrode rods.

[0004] A bellows is provided between the moving-side electrode rod and the moving-side flange, allowing the moving-side electrode to move along the axis of the insulating cylinder while maintaining a hermetically sealed condition. To prevent the bellows from being contaminated by an arc that occurs when the current is interrupted, a shield-shaped bellows cover is attached to the moving-side electrode rod. The electrode-side side of the bellows is attached to the bellows cover, or to the bellows cover and the moving-side electrode rod, and the side of the bellows opposite the electrode side is attached to the moving-side flange.

[0005] Inside the insulated container, an arc shield is provided to surround the opposing electrodes, preventing the inner surface of the insulating cylinder from being contaminated by an arc that occurs when the current is interrupted. On the moving side, a guide with a bearing function is attached to the moving end to ensure smooth movement along the axis during opening and closing.

[0006] Vertical magnetic field electrodes are known as one type of the aforementioned electrodes. For example, patent specification 1 describes a fixed-side contact (arc electrode) and a moving-side contact (arc electrode) arranged opposite each other, with coil electrodes provided on the back sides of the contacts. The coil electrodes are designed such that circumferentially extending coils are attached to the ends of arms extending radially from the axis. When currents flow circumferentially through the coils, a magnetic field (vertical magnetic field) is generated in the axial direction relative to an arc, according to the right-hand rule.When the arc is exposed to the vertical magnetic field, the arc that inevitably forms between the contacts during current interruption is contained within the diameter of the contact and distributed across the contact area, thereby reducing the current density at the contact surface. This allows for effective current interruption.

[0007] On the other hand, the vertical magnetic field electrodes described in patent specification 2 are cup-shaped electrodes with inclined slots. Current flows circumferentially through these slots, generating a vertical magnetic field and thus effectively interrupting the current, as described in patent specification 1. CITATION LIST PATENT DOCUMENT Patent specification 1: Japanese published patent application no. 2002-150902 Patent specification 2: Japanese publication no. 2003-92050 Brief description of the invention and the problem to be solved by the invention.

[0008] In the vacuum valve, where, as described above, a magnetic field is generated axially at the contacts to improve current interruption performance, a current supply unit is provided at the coil electrode or the cup-shaped coil to apply current between the contact and the coil electrode or the cup-shaped coil. If the area on the contact surface, referred to as the effective magnetic field area, in which a magnetic field is generated axially with the necessary magnetic flux density, is larger, the current density at the contact surface can be reduced more significantly, thus enabling more effective current interruption. However, no axial magnetic field can be generated in the immediate vicinity of the current supply unit provided at the coil electrode or the cup-shaped coil, resulting in a loss in the effective magnetic field area.

[0009] If the applied current is high, the area of ​​the current supply unit must be increased to ensure conductivity, thus increasing the loss in the effective magnetic field area. The pursuit of a larger effective magnetic field area therefore leads to an increase in the diameters of the coil electrode, the cup-shaped coil, and the contact.

[0010] Generally, with higher interrupting currents, the contact diameter, coil electrode diameter, and cup-shaped coil diameter are also increased to ensure sufficient heat capacity and effective magnetic field area. However, increasing the coil electrode diameter and cup-shaped coil diameter increases the distance between the area near the contact center and the coil section that generates the axial magnetic field. This reduces the magnetic flux density near the contact center and decreases the efficiency of ensuring the effective magnetic field area based on the size increase.

[0011] The present disclosure was made to solve the above-mentioned problems, and one objective of the present disclosure is to provide a vacuum valve that can efficiently ensure a uniform magnetic flux density and effective magnetic field area and improve current interruption performance without increasing the electrode diameters. MEANS TO SOLVE THE PROBLEM

[0012] A vacuum valve according to the present disclosure comprises a pair of electrodes arranged such that they face each other axially in a vacuum vessel and can be brought into contact with and separated from each other by electrode rods. At least one of the electrodes has a coil provided 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 section adapted to the electrode rod. a plurality of first arm sections extending outwards from the fitting section in a radial direction, and a plurality of first coil section segments connected to the radially outer sides of the respective first arm sections and extending arc-shaped to one side in a circumferential direction.The second coil has a disc-shaped contact section that is in contact with the contact, a plurality of second arm sections extending outwards in the radial direction from the contact section, and a plurality of second coil subsections connected to the radially outer sides of the respective second arm sections and extending in an arc to another side in the circumferential direction, with first coil contact sections at distal ends of the second coil subsections of the second coil each connected to distal ends in the circumferential direction of the first coil subsections of the first coil, thereby forming a plurality of current conduction paths, and a first space formed between each first coil subsection of the first coil and a part, other than the first coil contact section, of the adjacent second coil subsection. EFFECT OF INVENTION

[0013] With the vacuum valve according to the present disclosure, it becomes possible to provide a vacuum valve that can efficiently ensure a uniform magnetic flux density and an effective magnetic field area without increasing the electrode diameters and can improve the current interruption performance. BRIEF DESCRIPTION OF THE DRAWINGS [ Fig. 1] Fig. Figure 1 is a cross-sectional view of a vacuum valve according to embodiment 1. [ Fig. 2] Fig. Figure 2 is an exploded perspective view showing a structure of a moving-side electrode according to embodiment 1. [ Fig. 3] Fig. Figure 3 is a top view of a first coil according to embodiment 1. [ Fig. 4] Fig. Figure 4A is a bottom view of a 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 from the lower Z - -Side viewed in axial direction Z. [ Fig. 5] Fig. Figure 5 shows a state in which the first coil and the second coil are combined according to embodiment 1, viewed from the upper Z+ side in the axial direction Z. [ Fig. 6] Fig. 6A is a cross-sectional view of the moving-side electrode according to embodiment 1 along line AA in Fig. 5. Fig. 6B is a cross-sectional view of the moving-side electrode along line BB in Fig. 5. [ Fig. 7] Fig. Figure 7A is a bottom view of a contact according to embodiment 1. Fig. 7B is a perspective view of the contact seen from the lower Z-side in the axial direction Z. [ Fig. 8] Fig. Figure 8A is a bottom view of a second coil according to embodiment 2. Fig. 8B is a top view of the second coil. [ Fig. 9] Fig. 9A is a bottom view of a contact according to embodiment 2. Fig. 9B is a perspective view of the contact seen from the lower Z-side in the axial direction Z. [ Fig. 10] Fig. Figure 10A is a cross-sectional view of a moving-side electrode according to embodiment 2. Fig. 10B is a cross-sectional view of the moving-side electrode. [ Fig. 11] Fig. Figure 11A is a bottom view of a modification of the second coil according to embodiment 2. Fig. Figure 11B is a top view of the modification of the second coil. [ Fig. 12] Fig. Figure 12A is a cross-sectional view of a modification of the moving-side electrode according to embodiment 2. Fig. Figure 12B is another cross-sectional view of this modification of the moving-side electrode. [ Fig. 13] Fig. Figure 13A is a bottom view of a second coil according to embodiment 3. Fig. 13B is a top view of the second coil. [ Fig. 14] Fig. Figure 14 shows a state in which a first coil and the second coil are combined according to embodiment 3, viewed from the upper Z+ side in the axial direction Z. [ Fig. 15] Fig. Figure 15 is an exploded perspective view showing a structure of a moving-side electrode according to embodiment 4. [ Fig. 16] Fig. Figure 16A is a bottom view of a second coil according to embodiment 4. Fig. 16B is a top view of the second coil. [ Fig. 17] Fig. Figure 17 shows a state in which a first coil and the second coil are combined according to embodiment 4, viewed from the upper Z+ side in the axial direction Z. [ Fig. 18] Fig. 18A is a cross-sectional view of the moving-side electrode according to embodiment 4 along line AA in Fig. 17. Fig. 18B is a cross-sectional view of the moving-side electrode along line BB in Fig. 17. [ Fig. 19] Fig. Figure 19 is an exploded perspective view showing a structure of a moving-side electrode according to embodiment 5. [ Fig. 20] Fig. Figure 20 is a top view of a first coil according to embodiment 5. [ Fig. 21] Fig. 21A is a bottom view of a 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 seen from the lower Z--side in the axial direction Z. Fig. 21D is a side view of the second coil. [ Fig. 22] Fig. Figure 22 shows a state in which the first coil and the second coil are combined according to embodiment 5, as seen from the upper Z+ side in the axial direction Z. [ Fig. 23] Fig. 23A is a cross-sectional view of the moving-side electrode according to embodiment 5 along line AA in Fig. 22. Fig. 23B is a cross-sectional view of the moving-side electrode along line BB in Fig. 22. [ Fig. 24] Fig. Figure 24 is an exploded perspective view showing a structure of a moving-side electrode according to embodiment 6. [ Fig. 25] Fig. Figure 25A is a bottom view of a 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 seen from the lower Z--side in the axial direction Z. Fig. 25D is a side view of the second coil. [ Fig. 26] Fig. Figure 26 shows a state in which the first coil and the second coil are combined according to embodiment 6, as seen from the upper Z+ side in the axial direction Z. [ Fig. 27] Fig. 27A is a cross-sectional view of the moving-side electrode according to embodiment 6 along line AA in Fig. 26. Fig. 27B is a cross-sectional view of the moving-side electrode along line BB in Fig. 26. [ Fig. 28] Fig. Figure 28 is a perspective view of an electrode as a comparative example. [ Fig. 29] Fig. Figure 29 is a top view of a coil electrode as a comparative example. [ Fig. 30] Fig. Figure 30 is a perspective view of an electrode as a comparative example. [ Fig. 31] Fig. Figure 31 is a side view of a coil electrode as a comparison example. DESCRIPTION OF EXECUTION FORMS Execution form 1

[0014] A vacuum valve according to embodiment 1 is described below with reference to the drawings.

[0015] In this description, the point where a moving-side contact and a fixed-side contact of the vacuum valve come into contact is defined as the "top side," and sides facing away from this point are defined as the "bottom sides." Therefore, the top-bottom relationship of the moving-side electrode and the top-bottom relationship of the fixed-side electrode are opposite. The axial direction of the electrodes, i.e., the direction in which the two contacts come into contact or separate, is defined as axial direction Z, the radial direction of the electrodes as radial direction X, and the circumferential direction of the electrodes as circumferential direction Y.

[0016] Fig. Figure 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 aluminum oxide ceramic or glass. A fixed-side flange 2A and a moving-side flange 2B made of a metal such as stainless steel are attached to metallization layers 1M formed at both ends of the insulating cylinder 1, so that a container is formed and the interior of the container is kept in a highly vacuumed and hermetically sealed state.

[0017] A fixed-side electrode rod 4A is attached to the fixed-side flange 2A, which is fixed at one end in the axial direction Z of the insulating cylinder 1, and a moving-side electrode rod 4B is attached to the moving-side flange 2B via a bellows 3. One end of the bellows 3 is attached to the moving-side flange 2B such that it surrounds the moving-side electrode rod 4B, and another end of the bellows 3 is attached to the moving-side electrode rod 4B such that it surrounds the moving-side electrode rod 4B via a bellows cover 3C, which is provided to prevent contamination of the bellows 3 by an arc occurring during current interruption.

[0018] A fixed-side electrode 20A is attached to the fixed-side electrode rod 4A, and a moving-side electrode 20B is attached to the moving-side electrode rod 4B, such that they are opposite each other in the axial direction Z. The structures of the fixed-side electrode 20A and the moving-side electrode 20B differ only in whether the respective electrode rod is movable or not. Therefore, the structure is described below using the moving-side electrode 20B as an example.

[0019] An arc protection device AS is provided in the insulating cylinder 1 such that it surrounds the contacts 21, which are opposite each other in the axial direction Z. For the moving-side electrode rod 4B, a guide G with bearing function is attached to the moving-side flange 2B to enable smooth movement in the axial direction Z during an opening and closing operation of the moving-side electrode rod 4B.

[0020] Fig. Figure 2 is an exploded perspective view showing a structure of the moving-side electrode 20B. As in Fig. As shown in Figure 2, the moving-side electrode 20B is composed of the contact 21, a reinforcing element 22, and a coil K comprising a first coil 23 and a second coil 24. The moving-side electrode rod 4B has a fitting section 4Ba to which the first coil 23 is adapted, and the first coil 23 is adapted to and attached to the moving-side electrode rod 4B.

[0021] Fig. Figure 3 is a top view of the first coil 23. The first coil 23 has an annular fitting section 23a, which is provided in the middle and is attached to the moving-side electrode rod 4B, four arm sections 23b (first arm sections) which extend evenly distributed in the radial direction X from the fitting section 23a outwards in the circumferential direction Y, and first coil subsections 23c which are connected to the outer sides in the radial direction X of the arm sections 23b and extend in an arc to one side in the circumferential direction Y.

[0022] A slot 23S is formed between the first coil sections 23c adjacent to each other in the circumferential direction Y, so that the first coil sections 23c are not electrically connected to each other in the circumferential direction Y. Therefore, current flowing through the moving-side electrode rod 4B branches into the four arm sections 23b, and the branched currents flow through the arc-shaped first coil sections 23c to the same side in the circumferential direction Y.

[0023] The first coil section 23c is provided with a blind hole section 23z (first blind hole section) which points towards the lower Z - -side is recessed in the axial direction Z. Due to the blind hole section 23z, the thickness in the axial direction Z of the first coil section 23c is greater on an outer side in the radial direction X than on an inner side.

[0024] Fig. 4A is a bottom view of the second coil 24. Fig. 4B is a top view of the second coil 24. Fig. 4C is a perspective view of the second coil 24, from the lower Z - -Side viewed in axial direction Z.

[0025] The second coil 24 has a disc-shaped contact section 24a, four arm sections 24b (second arm sections) extending outwards in the circumferential direction Y from the contact section 24a in the radial direction X, and second coil subsections 24c connected to the radially outer sides of the respective arm sections 24b and extending in an arc to one side in the circumferential direction Y. The direction in which the second coil subsection 24c extends in the circumferential direction Y from the arm section 24b is opposite to the direction of the first coil subsection 24c of the first coil 23 when the first coil 23 and the second coil 24 are aligned in the axial direction Z as shown in Fig. 2 are combined (see Fig. 3 and Fig. 4B).

[0026] The second coil section 24c has a first coil contact section 24d at a distal end, which is oriented towards the lower Z relative to the remaining part of the second coil section 24c. - -side projects in the axial direction Z and outwards in the radial direction X.

[0027] The first coil contact section 24d is a section that occurs when the first coil 23 and the second coil 24 are combined as in Fig. 2 electrically connected to a distal end in the circumferential direction Y of the first coil section 23c of the first coil 23 in axial direction Z and radial direction X.

[0028] A slot 24S is formed between the second coil sections 24c adjacent in the circumferential direction Y. This slot extends radially X along the arm section 24b and arcuately in the circumferential direction Y along the inner circumferential surface of the second coil section 24c from the base section of the arm section. Therefore, currents originating from the four first coil contact sections 24d of the second coil 24 flow through the respective arcuate second coil sections 24c and the respective arm sections 24b to merge in the contact section 24a.

[0029] An upper end surface of the second coil section 24c has a flange-shaped projection 24e (first projection) that extends outwards in the radial direction X.

[0030] The contact section 24a and the arm sections 24b described above project upwards in the axial direction Z relative to the second coil section 24c, so that they are in contact with the contact 21. The slot 24S described above extends in an arc between the contact section 24a and the second coil section 24c. Therefore, the second coil section 24c does not project in the axial direction Z and radial direction X with the contact on the upper Z + -side in axial direction Z contact 21 in contact.

[0031] Fig. Figure 5 shows a state in which the first coil 23 and the second coil 24 are combined, from the upper Z + -side seen in the axial direction Z. In Fig. 5 are the structure of the second coil 24 on the lower Z - -Side in the axial direction Z and the first coil 23 are shown by dashed lines. Fig. 6A is a cross-sectional view of the moving-side electrode 20B along line AA in Fig. 5. Fig. 6B is a cross-sectional view of the moving-side electrode 20B along line BB in Fig. 5. Fig. 7A is a sub-view of contact 21. Fig. 7B is a perspective view of contact 21 from the lower Z - -Side seen in the axial direction Z.

[0032] As in the hatched area in Fig. Figure 5 shows an outer surface 24d1 and a bottom surface 24d2 of the first coil contact section 24d of the second coil 24 attached to a side surface 23z1 and a bottom surface 23z2 of the blind hole section 23z of the first coil 23 along the slot 23S of the first coil 23.

[0033] As in Fig. 4C is shown, since the first coil contact section 24d of the second coil 24 is relative to the remaining part of the second coil section 24c in the radial direction X outwards and in the axial direction Z towards the lower Z - -side projects, the second coil section 24c (excluding the first coil contact section 24d) of the second coil 24 and the first coil section 23c of the first coil 23 are spaced apart from each other in the radial direction X and the axial direction Z, and a space S3 (first space) is formed in the radial direction X and the axial direction Z between the first coil section 23c of the first coil 23 and the second coil section 24c of the second coil 24, as shown in Fig. 6B shown. Thus, the first coil 23 and the second coil 24, which are connected via the first coil contact sections 24d of the second coil 24, form four independent current conduction paths CR, as shown in Fig. Figure 5 shows that the four current conduction paths CR are not in contact with each other in the axial direction Z and the radial direction X.

[0034] As in Fig. 7A and Fig. As shown in Figure 7B, the contact 21 is provided with a blind hole section 21a on a surface on the Z-side in the axial direction Z. The contact contact section 24a of the second coil 24 and the arm section 24b, which is flush with the contact contact section 24a, are fixed in the axial direction Z and the radial direction X within the blind hole section 21a.

[0035] Since the contact section 24a and the arm section 24b project axially towards the upper Z+ side relative to the second coil section 24c of the second coil 24, a space S4 (second space) is formed between the second coil section 24c and the underside of the contact 21, as shown in Fig. 6 shown.

[0036] Between the first coil 23 and the second coil 24, a shield-shaped reinforcing element 22 with a disk section 22a and a column section 22b is provided to reinforce the contact 21. The column section 22b of the reinforcing element 22 is attached to the moving-side electrode rod 4B, and the disk section 22a is in contact with the underside in the axial direction Z of the contact section 24a of the second coil 24, thereby reinforcing the contact 21.

[0037] In the vacuum valve 100 configured as above, current flows from the moving-side electrode rod 4B via the pass section 23a of the first coil 23 into the first coil 23, passes through the arm section 23b and then the first coil subsection 23c of the first coil 23. The current then flows via the first coil contact section 24d of the second coil 24 into the second coil subsection 24c of the second coil 24, passes through the arm section 24b and then the contact contact section 24a and continues into the contact 21. Thus, as in Fig. Figure 5 shows that the length of the coil includes not only the first coil section 23c of the first coil 23, but also the second coil section 24c of the second coil 24, thereby increasing the length of the current conduction path CR for the current.

[0038] The first coil section 23c of the first coil 23 is located on the lower Z--side in the axial direction Z of the arm section 24b, which is connected to the contact section 24a of the second coil 24. Therefore, on the lower Z--side in the axial direction Z of a current supply section to the contact 21, current flows through another current conduction path CR in the circumferential direction Y.

[0039] This is how it is described in Fig. Figure 3 shows an outer diameter of the first coil 23, denoted by a, and a blind hole diameter of the blind hole section 23z of the first coil 23 is denoted by b. As shown in Fig. As shown in Figure 4A, an outer diameter of the projections 24e of the second coil 24 is denoted by c, an outer diameter of the first coil contact sections 24d of the second coil 24 is denoted by d, and an outer diameter of the second coil subsections 24c, excluding the first coil contact sections 24d, is denoted by e. Then the relations a ≥ c and b = d > e must be satisfied.

[0040] As in Fig. Figure 7A shows a blind hole diameter of the blind hole section 21a on the back side of the contact 21, denoted by g, and as shown in Fig. As shown in Figure 4B, the outer diameter of the contact section 24a and the arm sections 24b of the second coil 24 is denoted by f. Then f = g is satisfied, taking the assembly into account. Of course, it is not a problem if the edges of components are rounded or chamfered during machining.

[0041] Fig. Figure 28 is a perspective view of a moving-side electrode 820B as a comparison example.

[0042] This structure essentially corresponds to a structure in which the second coil 24 is removed from the moving-side electrode 20B of the present embodiment 1.

[0043] As in Fig. As shown in Figure 28, the moving-side electrode 820B has a helical coil electrode 823, the disc-shaped contact 21, and the reinforcing element 22, which reinforces the contact 21. The coil electrode 823 and the reinforcing element 22 are attached to the moving-side electrode rod 4B.

[0044] Fig. Figure 29 is a top view of the coil electrode 823.

[0045] The coil electrode 823 has a fitting section 823a in the middle and is attached by the fitting section 823a being adapted to the fitting section 4Ba of the moving-side electrode rod 4B.

[0046] The coil electrode 823 comprises the annular fitting section 23a, which is provided in the center and to which the moving-side electrode rod 4B is attached; four arm sections 823b, which extend outwards from the fitting section 23a in the radial direction X and are evenly distributed in the circumferential direction Y; and coil subsections 823c, which extend in an arc from the radially outer sides of the arm sections 823b to one side in the circumferential direction Y. The coil subsection 823c has a current supply unit 823d at its distal end, which projects in the axial direction Z towards the upper Z+ side and is connected to the contact 21.

[0047] A slot 23S is formed between the coil sections 823c adjacent in the circumferential direction Y, so that the coil sections 823c are electrically separated from each other in the circumferential direction Y. Therefore, current flowing through the moving-side electrode rod 4B branches into four arm sections 823b, and the branched currents flow through the arc-shaped coil sections 823c to the same side in the circumferential direction Y to combine via the respective current supply units 823d in the contact 21. That is, current flowing from the moving-side electrode rod 4B passes through a current conduction path 8CR, as shown in Fig. 29 is shown, and is routed to contact 21 via the power supply unit 823d.

[0048] The coil section 823c extends circumferentially Y along the outer circumference of the underside in the axial direction Z of contact 21. In a vacuum valve with such a coil electrode 823, a magnetic field is generated in the axial direction Z according to the right-hand rule when current flows through the coil electrode 823. This confines any arc that inevitably forms between the contacts during interruption within the diameter of contact 21 and distributes it over the surface of contact 21, thereby reducing the current density at the surface of contact 21. This results in an interruption of the current.

[0049] In comparison to the comparative example, the vacuum valve 100 according to embodiment 1 has a pair of electrodes arranged such that they face each other axially in a vacuum vessel and can be brought into contact with and separated from each other by electrode rods. At least one of the electrodes has a coil provided 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 section adapted to the electrode rod, a plurality of first arm sections extending outwards from the fitting section in a radial direction, and a plurality of first coil subsections connected to the radially outer sides of the respective first arm sections and extending in an arc to one side in a circumferential direction.The second coil has a disc-shaped contact section in contact with the contact, a plurality of second arm sections extending radially outward from the contact section, and a plurality of second coil subsections connected to the radially outer sides of the respective second arm sections and extending circumferentially in an arc to another side. Between the first coil and the second coil, first coil contact sections at the distal ends of the second coil subsections of the second coil are connected to distal ends circumferentially of the first coil subsections of the first coil, forming a plurality of current conduction paths. A first space is formed between each first coil subsection of the first coil and a portion, excluding the first coil contact section, of the adjacent second coil subsection.

[0050] Thus, the current conduction path CR of the coil is extended by the length of the second coil section 24c compared to the current conduction path 8CR in the comparison example, so that without increasing the electrode diameters, a uniformity of the magnetic flux density and an area with effective magnetic flux density for distributing an arc on the contact surface, a so-called effective magnetic field area, can be ensured, thereby achieving a vacuum valve with improved current interruption performance.

[0051] Furthermore, since the second space is formed between the second coil section and the underside of the contact, a current flow in the circumferential direction Y on the lower Z is possible. --side in the axial direction Z of the arm section 24b, which is connected to the contact section 24a, is possible. Therefore, it becomes possible to generate a magnetic field in the axial direction even on a section with a current supply function, so that the effective magnetic field area is further increased and the current density per unit area of ​​the contact surface at the time of current interruption in the vacuum valve 100 is reduced, thereby improving the current interruption performance.

[0052] Furthermore, each first coil section is provided with a first blind hole section that is recessed downwards in the axial direction. Due to this first blind hole section, the thickness of the first coil section is greater on its outer side than on its inner side. The first coil contact sections of the second coil are in axial and radial contact with the distal ends of the first coil sections in the circumferential direction. The first spaces are formed between the first and second coil sections in both the radial and axial directions. Thus, the second coil can be positioned within the first blind hole section, thereby shortening the length of the vacuum valve in the axial direction.

[0053] Furthermore, every second coil section of the second coil has an annular projection that extends outwards in the radial direction and circumferentially. This increases the current-carrying capacity of the coil, thereby improving its current interruption performance.

[0054] A conventional vacuum valve, in which a magnetic field is generated in the axial direction to improve interruption performance, has the problem that an eddy current is induced in the contact, and a magnetic field generated by the eddy current weakens the magnetic field in the axial direction. To avoid eddy currents, it is known, as in patent specification 1, to provide a slot in the radial direction in a contact.

[0055] However, a slot extending through the contact leads to a new problem: in particular, in a vacuum valve for a high rated voltage class, the slot becomes a section that worsens the dielectric strength between axially opposed contacts.

[0056] A structure is known in which a radial groove, not extending through the contact, is provided on the coil electrode side of the contact. However, this groove must be produced by careful machining with a small milling tool, which makes contact production time-consuming and increases costs. In contrast, as in the present embodiment, when space S4 is formed, current can hardly flow in the circumferential direction Y from the contact contact section 24a of the second coil 24, thus avoiding a deterioration of the dielectric strength by providing a slot in the contact and suppressing an eddy current flowing through contact 21.

[0057] When the eddy current is suppressed, the magnetic field strength and the effective magnetic field area are improved, which can further improve the interruption performance of the vacuum valve 100.

[0058] Furthermore, the improved interruption performance of the vacuum valve 100 allows for the interruption of a larger current, thus contributing to the increased current capacity of the vacuum valve 100. Additionally, the increased effective magnetic field area promotes the distribution of an arc across the surface of contact 21, thereby further reducing thermal damage to the surface of contact 21. This extends the current interruption service life of the vacuum valve 100 and allows its application range to be expanded to include specifications that permit multiple interruptions, and the like.

[0059] Furthermore, an area with the required effective magnetic flux density can be ensured with a smaller diameter than with a conventional coil electrode, thus reducing the diameter of the coil electrode. Due to the reduced diameter of the coil electrode, other components of the vacuum valve 100 can also be reduced in diameter, contributing to the overall reduction in diameter and weight of the vacuum valve 100.

[0060] Naturally, reducing the diameter and weight of the vacuum valve 100 will also result in a cost reduction of the vacuum valve 100.

[0061] Furthermore, the second coil 24 is provided with the projection 24e such that a ≥ c is satisfied, thereby relaxing an electric field, increasing the conductivity and improving the current conductivity of the vacuum valve 100. Design 2

[0062] The following describes a vacuum valve according to embodiment 2, focusing on a difference from embodiment 1.

[0063] Fig. 8A is a bottom view of a second coil 224.

[0064] Fig. 8B is a top view of the second coil 224.

[0065] Fig. 9A is a sub-view of contact 221.

[0066] Fig. 9B is a perspective view of contact 221 from the lower Z--side seen in the axial direction Z.

[0067] The vacuum valve 100 according to embodiment 2 differs only in the structure of the contact 21 and the second coil 24 from the structure of the vacuum valve 100 described in embodiment 1.

[0068] As in Fig. 8A and Fig. As shown in Figure 8B, the second coil 224, like the second coil 24 shown in embodiment 1, has a disk-shaped contact touching section 224a, four arm sections 24b which extend outwards in the radial direction X from the contact touching section 224a in the circumferential direction Y in a uniformly distributed manner, and second coil subsections 24c which extend in an arc shape from the radially outer sides of the respective arm sections 24b to one side in the circumferential direction Y.

[0069] The second coil section 24c has a first coil contact section 24d at its distal end, which projects outwards in the radial direction X and towards the lower Z-side in the axial direction Z relative to the remaining part of the second coil section 24c. The first coil contact section 24d is a section that is in contact with a distal end in the circumferential direction Y of the first coil section 23c of the first coil 23 in the axial direction Z and radial direction X, in order to be electrically connected to it when the first coil 23 and the second coil 224 are combined.

[0070] One difference between the second coil 224 and the second coil 24 of embodiment 1 is that the second coil 224, as in Fig. As shown in Figure 8B, the contact section 224a has a thin-walled cylindrical blind hole section 224z (second blind hole section) on its upper side in the axial direction Z, which is coaxial to the moving-side electrode rod 4B. As shown in Fig. 9A and Fig. As shown in Figure 9B, the contact 221 has a thin-walled cylindrical projection 221P (second projection) in the middle of the underside in the axial direction Z, which is coaxial to the moving-side electrode rod 4B and projects towards the lower Z--side in the axial direction Z.

[0071] Fig. 10A and Fig. Figure 10B shows sectional views of a moving-side electrode 220B. Fig. 10A is a representation accordingly Fig. 6A of embodiment 1, and Fig. 10B is a representation accordingly Fig. 6B of embodiment 1.

[0072] As in Fig. As shown in Figure 10, the projection 221P of the contact 21 is adapted to the blind hole section 224z of the second coil 224, so that the center position of the contact 221 is determined by the blind hole section 224z of the second coil 224, instead of by the outer circumferential surface of the contact contact section 224a of the second coil 224.

[0073] Fig. Figure 11A is a bottom view showing a modification of the second coil 224. Fig. Figure 11B is a top view showing the modification of the second coil 224.

[0074] Fig. 12A and Fig. Figures 12B are sectional views of the moving-side electrode 220B. Fig. 12A is a representation accordingly Fig. 6A of embodiment 1, and Fig. 12B is a representation accordingly Fig. 6B of embodiment 1.

[0075] As in Fig. 11A and Fig. As shown in Figure 11B, the contact touching section 224a of the second coil 224 can also be provided with a through hole 224H instead of the blind hole section 224z.

[0076] As in Fig. 12A and Fig. As shown in Figure 12B, the projection 221P of contact 221 is adapted to the through hole 224H of the second coil 224, thus determining the center position of contact 221.

[0077] In the present embodiment 2, as in embodiment 1, the length of the coil includes not only the length of the first coil section 23c of the first coil 23, but also the length of the second coil section 24c of the second coil 224, so that the length of the current conduction path of the coil increases.

[0078] This is how it is described in Fig. Figure 8 shows the blind hole diameter of the blind hole section 224z of the second coil 24, denoted by h, and as in Fig. As shown in Figure 9, the outer diameter of the projection 221P of the contact 221 is denoted by i. Then, taking the assembly into account, h = i is satisfied. Furthermore, if the diameter of the through-hole 224H of the second coil 224 is as shown in Figure 9, then the following applies: Fig. 11B is labelled with j, and j = i is satisfied. Naturally, it is not a problem if the edges of components are rounded or chamfered during machining.

[0079] In the vacuum valve 100 according to embodiment 2, the contact touching section of the second coil has a second blind hole section on a top side in the axial direction, which is coaxial to the electrode rod, the contact has a cylindrical second projection on a bottom side in the axial direction, which is coaxial to the electrode rod, and the second projection is adapted to the second blind hole section, or The contact touching section of the second coil has a through-hole coaxial with the electrode rod, the contact has a cylindrical second projection on a bottom side in the axial direction, which is coaxial to the electrode rod, and the second projection is adapted to the through-hole.

[0080] Thus, the same effects are achieved as in embodiment 1. Furthermore, the centering of the contact 221 does not need to be carried out via the outer circumference of the contact contact section 224a of the second coil 224. Therefore, the thickness of the second coil 224 can be reduced in the axial direction Z, which shortens the distance between the surface of the contact 221 and both the first coil 23 and the second coil 224, improves the magnetic flux density and the effective magnetic field area at the surface of the contact 221, and further improves the current interruption performance of the vacuum valve 100. embodiment 3

[0081] The following describes a vacuum valve according to embodiment 3, with a focus on a difference from embodiment 1.

[0082] Fig. 13A is a bottom view of a second coil 324.

[0083] Fig. 13B is a top view of the second coil 324.

[0084] The vacuum valve 100 according to the present embodiment 3 differs only in the structure of the second coil 324 from the structure of the vacuum valve 100 described in embodiment 1.

[0085] As in Fig. 13A and Fig. As shown in Figure 13B, the second coil 324, like the second coil 24 shown in embodiment 1, has a disk-shaped contact touching section 324a, four arm sections 24b which extend outwards in the radial direction X from the contact touching section 324a in the circumferential direction Y in a uniformly distributed manner, and second coil subsections 24c which extend in an arc shape from the radially outer sides of the respective arm sections to one side in the circumferential direction Y. The second coil 324 indicates in the

[0086] The contact contact section 324a has a contact-side slot 24S2 which is connected to the slot 24S and extends inwards in the radial direction X from a base section of the second coil part section 24c.

[0087] Fig. Figure 14 shows a state in which the first coil 23 and the second coil 324 are combined, viewed from the upper Z+ side in the axial direction Z. Fig. Figure 14 shows the structure of the second coil 324 on the lower Z--side in the axial direction Z and the first coil 23, represented by dashed lines.

[0088] The vacuum valve 100 according to embodiment 3 achieves the same effects as in embodiment 1.

[0089] Furthermore, the contact touching section of the second coil has the contact-side slot 24S2, which extends inwards in the radial direction from the base section of the second coil subsection.

[0090] That is, as in Fig. As shown in Figure 14, the second coil 324 has the contact-side slot 24S2, which is connected to the slot 24S. Thus, when electrical power is supplied from the contact-contact section 324a of the second coil 324 to the contact 21, current flowing on the contact 21 can be prevented from flowing in a direction opposite to the current-conducting path of the first coil section 23c and the second coil section 24c.

[0091] As described above, when electrical power is supplied from the contact contact section 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 conduction path CR of the coil due to the effect of the contact-side slot 24S2. Thus, compared to embodiment 1, the magnetic flux density and the effective magnetic field area are improved, which further enhances the current interruption performance of the vacuum valve 100.

[0092] Naturally, the blind hole section 224z or the through hole 224H of the second coil 224, as shown in embodiment 2, can also be provided in the present embodiment. It is also unproblematic if the edges of components are rounded or chamfered during machining. Design 4

[0093] The following describes a vacuum valve according to embodiment 4, with a focus on a difference to embodiment 1.

[0094] Fig. Figure 15 is an exploded perspective view showing the structure of a moving-side electrode 420B.

[0095] Fig. 16A is a bottom view of a second coil 424.

[0096] Fig. 16B is a top view of the second coil 424.

[0097] Fig. Figure 17 shows a state in which the first coil 23 and the second coil 424 are combined, viewed from the upper Z+ side in the axial direction Z. Fig. Figure 17 shows the structure of the second coil 424 on the lower Z--side in the axial direction Z and the first coil 23 by dashed lines.

[0098] The vacuum valve 100 according to the present embodiment 4 differs only in the structure of the second coil 424 from the structure of the vacuum valve 100 described in embodiment 1.

[0099] As in Fig. 16A and Fig. As shown in Figure 16B, the second coil 424, like the second coil 24 shown in embodiment 1, has a disk-shaped contact touching section 24a, four arm sections 424b which extend outwards in the radial direction X from the contact touching section 24a in the circumferential direction Y in a uniformly distributed manner, and second coil subsections 424c which extend in an arc shape from the radially outer sides of the respective arm sections to one side in the circumferential direction Y.

[0100] Fig. 18A is a cross-sectional view of the moving-side electrode 420B along line AA in Fig. 17. Fig. 18B is a cross-sectional view of the moving-side electrode 420B along line BB in Fig. 17.

[0101] The second coil 424 according to the present embodiment 4 does not have a projection 24e, which is provided in embodiment 1 for the second coil 24. Therefore, the second coil 424, as in Fig. 15, Fig. 18A and Fig. 18B shows no components that protrude outwards in the radial direction X relative to the first coil 23 when viewed in the axial direction Z.

[0102] Furthermore, the length in the axial direction Z of the second coil section 424c is reduced compared to the second coil section 24c in embodiment 1.

[0103] In the present embodiment 4, as in embodiment 1, the length of the coil comprises not only the length of the first coil section 23c of the first coil 23, but also the length of the second coil section 424c of the second coil 424, thus increasing the length of the current conduction path CR of the coil. However, since the second coil 424 lacks a projection 24e, its conductivity is reduced compared to embodiment 1. Simultaneously, due to the absence of the projection 24e of the second coil 424, the length in the axial direction Z of the second coil section 424c is reduced, thus shortening the distance from the first coil 23 to the surface of the contact 21.

[0104] This is how it is described in Fig. Figure 3 shows the blind hole diameter of the blind hole section 23z of the first coil 23, denoted by b, and as in Fig. As shown in Figure 16A, the outer diameter of the first coil contact sections 424d of the second coil 424 is denoted by d, and the outer diameter of the second coil section sections 24c of the second coil 424 is denoted by e. Then, taking the assembly into account, b ≥ d > e must be satisfied.

[0105] The vacuum valve 100 according to embodiment 4 achieves the same effects as in embodiment 1.

[0106] As described above, since the second coil 424 does not have a projection 24e, the conductivity is reduced compared to embodiment 1, but the distance between the first coil 23 and the surface of the contact 21 is shortened, which can improve the magnetic flux density and the effective magnetic field area at the surface of the contact 21.

[0107] Naturally, the blind hole section 224z or the through hole 224H of the second coil 224, as shown in embodiment 2, or the contact-side slot 24S2 of the second coil 324, as shown in embodiment 3, can also be provided in the present embodiment. It is also unproblematic if the edges of components are rounded or chamfered during machining. Design 5

[0108] The following describes a vacuum valve according to embodiment 5, with a focus on a difference from embodiment 1.

[0109] Fig. Figure 19 is an exploded perspective view showing the structure of a moving-side electrode 520B.

[0110] Fig. Figure 20 is a top view of a first coil 523.

[0111] Fig. 21A is a bottom view of a second coil 524.

[0112] Fig. 21B is a top view of the second coil 524.

[0113] Fig. 21C is a perspective view of the second coil 524, seen from the lower Z--side in the axial direction Z.

[0114] Fig. 21D is a side view of the second coil 524.

[0115] Fig. Figure 22 shows a state in which the first coil 523 and the second coil 524 are combined, viewed from the upper Z+ side in the axial direction Z. Fig. Figure 22 shows the structure of the second coil 524 on the lower Z--side in axial direction Z and the first coil 523, represented by dashed lines.

[0116] Fig. 23A is a cross-sectional view of the moving-side electrode 520B along line AA in Fig. 22. Fig. 23B is a cross-sectional view of the moving-side electrode 520B along line BB in Fig. 22.

[0117] The vacuum valve 100 according to the present embodiment 5 differs in that the first coil 23 is replaced by the first coil 523, which is cup-shaped, and that the second coil 524 has a modified shape compared to the second coil 24, compared to the structure of the vacuum valve 100 described in embodiment 1.

[0118] As in Fig. As shown in Figure 19, the first coil 523 has a cup-like shape with a base and is formed from a cylindrical section 523A and a base section 523B. A fitting section 523a is formed in the middle of the base section 523B, which is adapted to the moving-side electrode rod 4B and is connected by fitting to the Fig. 19 shown, the fitting section 4Ba of the moving-side electrode rod 4B is attached.

[0119] The cylindrical section 523A has a plurality (here: four) inclined slots 523AS arranged obliquely to the axial direction Z, forming a plurality of arcuate first coil section segments 523c. A lower end of each inclined slot 523AS in the axial direction Z smoothly transitions into a bottom slot 523BS formed in the bottom section 523B. An annular blind hole segment 523z is formed on the inside of the first coil section segment 523c. A region between circumferentially adjacent bottom slots 523BS in the bottom section 523B is an arm segment 523b, which extends into Fig. 20 is shown and corresponds to arm section 23b in embodiment 1.

[0120] As in Fig. As shown in Figure 21A, the second coil 524, like the second coil 24 described in embodiment 1, has the contact touching section 24a, the arm sections 24b, the second coil subsections 524c, the first coil contacting sections 524d, and the slots 24S. A bottom surface of the first coil contacting section 524d has a conical section 524t, the thickness of which decreases gently in the axial direction Z towards the side to which current flows.

[0121] As in Fig. As shown in Figure 22, an outer surface 524d1 and a bottom surface 524d2 of the first coil contact section 524d of the second coil 524 are attached to a side surface 523z1 and a bottom surface 523z2 of the blind hole section 523z of the first coil 523 along the slot 23S of the first coil 23.

[0122] More precisely, with respect to the second coil 524, there is an inclined surface 524t1 (see Fig. 21D) of the conical section 524t of the second coil 524 is attached to a side face of the blind hole section 523z of the first coil 523 at a position along the inclined slot 523AS of the first coil 523, namely at an end region on the contact-21 side of the first coil part section 523c of the first coil 523.

[0123] As in Fig. 21C shown, since the first coil contact section 524d of the second coil 24 is relative to the remaining part of the second coil section 524c in the radial direction X outwards and in the axial direction Z towards the lower Z --side projects, the second coil section 524c (excluding the first coil contact section 524d) of the second coil 524 and the first coil section 23c of the first coil 523 are spaced apart from each other in the radial direction X and the axial direction Z, and a space S3 is formed in the radial direction X and the axial direction Z between the first coil section 23c of the first coil 523 and the second coil section 524c of the second coil 524, as shown in Fig. 23B shown. Thus, the first coil 523 and the second coil 524, which are connected via the first coil contact section 524d of the second coil 524, form independent current conduction paths CR, as shown in Fig. 22 shown, and furthermore the four current conduction paths CR in the axial direction Z and the radial direction X are not in contact with each other.

[0124] As in embodiment 1, as in Fig. 7A and Fig. 7B shows contact 21 on a surface on the Z - The side is provided with a blind hole section 21a in the axial direction Z. The contact contact section 24a of the second coil 524 and the arm section 24b, which is flush with the contact contact section 24a, are fixed in the axial direction Z and the radial direction X in the blind hole section 21a.

[0125] Since the contact section 24a and the arm section 24b project axially towards the upper Z+ side relative to the second coil section 524c of the second coil 24, a space S4 is formed between the second coil section 524c and the underside of the contact 21, as shown in Fig. 23A shown.

[0126] In the vacuum valve 100 according to embodiment 5, as in embodiment 1, current flows from the moving-side electrode rod 4B via the pass section 523a of the first coil 523 into the first coil subsection 523c of the first coil 523, flows via the first coil contact section 524d of the second coil 524 into the second coil subsection 524c and then flows via the contact contact section 24a and the arm section 24b into the contact 21 through the current conduction path CR, as in Fig. 22 shown.

[0127] The first coil section 523c of the first coil 23 is located on the lower Z - -side in the axial direction Z of the arm section 24b, which is connected to the contact section 24a of the second coil 24. Therefore, current flows on the lower Z - -Side in the axial direction Z of a current supply section to the contact 21 current through another current conduction path CR in the circumferential direction Y.

[0128] This is how it is described in Fig. Figure 22 shows an outer diameter of the first coil 523, denoted by k, and a blind hole diameter of the blind hole section 523z of the first coil 523 is denoted by m. As shown in Fig. As shown in Figure 21A, an outer diameter of the projections 24e of the second coil 24 is denoted by c, an outer diameter of the first coil contact sections 524d of the second coil 524 is denoted by d, and an outer diameter of the second coil subsections 524c, excluding the first coil contact sections 524d, is denoted by e. Then the relations k ≥ c and m = d > e must be satisfied.

[0129] As in Fig. Figure 7A shows a blind hole diameter of the blind hole section 21a on the back side of the contact 21, denoted by g, and as shown in Fig. Figure 21B shows an outer diameter of the contact section 24a and the arm sections 24b of the second coil 524, denoted by f. Then, taking the assembly into account, f = g is satisfied.

[0130] If an angle of the inclined slot 523AS of the first coil 523 relative to a plane perpendicular to the axial direction Z is denoted by α, and a cone angle of the conical section 524t of the second coil 524 relative to the plane perpendicular to the axial direction Z is denoted by β, as in Fig. As shown in Figure 21D, it is desirable that the angles are set as α = β.

[0131] Naturally, the blind hole section 224z or the through hole 224H of the second coil 224, as shown in embodiment 2, can also be provided in the present embodiment. Naturally, the contact-side slot 24S2 of the second coil 24, as shown in embodiment 3, can also be provided in the present embodiment. Naturally, it is not a problem if the edges of components are rounded or chamfered during machining.

[0132] Fig. Figure 30 is a perspective view of a cup-shaped moving-side electrode 920B as a comparative example.

[0133] Fig. Figure 31 is a side view of a coil electrode as a comparison example.

[0134] The cup-shaped moving-side electrode 920B is shown as the electrode which generates a magnetic field in the axial direction Z according to the right-hand rule and thus effectively performs a current interruption.

[0135] The moving-side electrode 920B has a structure that is essentially the same as the structure in which the second coil 524 is removed from the moving-side electrode 520B of embodiment 5.

[0136] As in Fig. As shown in Figure 30, a coil electrode 923 has a cup-like shape with a base and is formed from a cylindrical section 923A and a base section 923B. In the middle of the base section 923B, a fitting section 923a is formed, which is adapted to the moving-side electrode rod 4B and is attached by fitting to the fitting section 4Ba of the moving-side electrode rod 4B.

[0137] The cylindrical section 923A has a plurality (here: four) inclined slots 923AS extending obliquely to the axial direction Z, thereby forming a plurality of arcuate coil subsections 923c. A lower end of each inclined slot 923AS in the axial direction Z transitions smoothly into a bottom slot 923BS formed in the bottom section 923B. A region between circumferentially adjacent bottom slots 923BS in the bottom section 923B is an arm section 923b, corresponding to arm section 23b in embodiment 1. Furthermore, the coil subsection 923c has a current supply unit 923d at its distal end, which projects in the axial direction Z towards the upper Z+ side and is connected to the contact 21.

[0138] In this structure, current coming from the moving-side electrode rod 4B flows through a current conduction path 9CR, as shown in Fig. 31 shown, so that current is supplied to contact 21 via the power supply unit 923d.

[0139] In a vacuum valve with the moving-side electrode 920B described above, when current flows through the cup-shaped coil electrode 923, a magnetic field is generated in the axial direction Z according to the right-hand rule, so that the current density is reduced when interrupting and the current interruption is thus effective.

[0140] In contrast, in the vacuum valve 100 according to embodiment 5, compared to the comparative example, the first coil is formed from a cylindrical section and a bottom section, wherein the cylindrical section has a plurality of inclined slots arranged obliquely to the axial direction, and the first coil section parts are formed by the plurality of inclined slots.

[0141] Thus, the length of the current-conducting path CR of the coil is different compared to the reference example shown in Fig. 30 and Fig. Figure 31 is shown, enlarged. Furthermore, current flows on the lower Z - -side in the axial direction Z of the arm section 24b, which is connected to the contact section 24a, in the circumferential direction Y. Therefore, it becomes possible to generate a magnetic field in the axial direction even on a section with a current supply function, so that an area with an effective magnetic flux density for distributing an arc on the contact surface, a so-called effective magnetic field area, is further increased and a current density per unit area of ​​the contact surface at the time of current interruption in the vacuum valve 100 is reduced, thereby improving the current interruption performance.

[0142] A conventional vacuum valve, in which a magnetic field is generated in the axial direction to improve interruption performance, has the problem that an eddy current is induced in the contact, and a magnetic field generated by the eddy current weakens the magnetic field in the axial direction. To avoid eddy currents, it is known, as in patent specification 1, to provide a slot in the radial direction in a contact. However, a slot extending through the contact leads to a new problem: particularly in a vacuum valve for a high rated voltage class, the slot becomes a section that degrades the dielectric strength between contacts opposite each other in the axial direction Z.

[0143] A structure is known in which a radial groove, not extending through the contact, is provided on the coil electrode side of the contact. However, this groove must be produced by careful machining with a small milling tool, which makes contact production time-consuming and increases costs. In contrast, in the present embodiment, if the Fig. In the space S4 shown in 23A, current can hardly flow in the circumferential direction Y from the contact contact section 24a of the second coil 524, thereby avoiding a deterioration of the dielectric strength by providing a slot in the contact and suppressing an eddy current flowing through the contact 21.

[0144] When the eddy current is suppressed, the magnetic field strength and effective magnetic field area are improved, further enhancing the interrupting performance of the vacuum valve 100. Furthermore, the improved interrupting performance of the vacuum valve 100 allows for the interruption of a larger current, contributing to the increased current capacity of the vacuum valve 100. Additionally, the increased effective magnetic field area promotes the distribution of an arc across the surface of contact 21, further reducing thermal damage to the surface of contact 21. This extends the current interrupting service life of the vacuum valve 100 and allows its application range to be expanded to include specifications that permit multiple interruptions, etc.

[0145] Furthermore, an area with the required effective magnetic flux density can be achieved with a smaller diameter than with a conventional coil electrode, thus reducing the diameter of the coil electrode itself. Due to the reduced diameter of the coil electrode, other components of the vacuum valve 100 can also be reduced in diameter, contributing to a reduction in the overall diameter and weight of the vacuum valve 100. Naturally, reducing the diameter and weight of the vacuum valve 100 also results in a cost reduction.

[0146] Furthermore, the second coil 24 is provided with the projection 24e so that k ≥ c is satisfied, thereby relaxing an electric field, increasing the conductivity and improving the current conductivity of the vacuum valve 100.

[0147] Furthermore, the base section has a multitude of slots that connect to the inclined slots and form the first arm sections. This allows the coil length to be increased further.

[0148] One underside of each first coil contact section has a conical section whose thickness decreases in the axial direction towards the side to which current flows. Thus, the first coil 523 and the second coil 524 can be connected to each other along the inclined slots.

[0149] Furthermore, if the angle of the inclined slot of the first coil relative to a plane perpendicular to the axial direction is denoted by α, and the cone angle of the conical section of the second coil relative to the plane perpendicular to the axial direction is denoted by β, then α = β is satisfied. This allows the distances between the first coil and the second coil to be standardized, thus ensuring uniform current paths CR. Design 6

[0150] The following describes a vacuum valve according to embodiment 6, focusing on the differences from embodiment 5.

[0151] Fig. Figure 24 is an exploded perspective view showing the structure of a moving-side electrode 620B.

[0152] Fig. 25A is a bottom view of a second coil 624.

[0153] Fig. 25B is a top view of the second coil 624.

[0154] Fig. 25C is a perspective view of the second coil 624 from the lower Z - -Side seen in the axial direction Z.

[0155] Fig. 25D is a side view of the second coil 624.

[0156] Fig. Figure 26 shows a state in which the first coil 523 and the second coil 624 are combined, from the upper Z + -side seen in the axial direction Z. In Fig. 26 are the structure of the second coil 624 on the lower Z - -Side in the axial direction Z and a non-visible part of the first coil 523 shown in dashed lines.

[0157] The vacuum valve 100 according to the present embodiment 6 differs only in the structure of the second coil 624 from the structure of the vacuum valve 100 described in embodiment 5.

[0158] As in Fig. 25A and Fig. As shown in Figure 25B, the second coil 624 – like the second coil 524 described in embodiment 5 – has a disk-shaped contact touching section 24a, four arm sections 24b extending uniformly in the circumferential direction Y from the contact touching section 24a in the radial direction X, and second coil subsections 624c extending arc-shaped from the outer sides in the radial direction X of the respective arm sections to one side of the circumferential direction Y.

[0159] Fig. 27A is a cross-sectional view of the moving-side electrode 620B along line AA in Fig. 26. Fig. 27B is a cross-sectional view of the moving-side electrode 620B along line BB in Fig. 26.

[0160] The second coil 624 according to the present embodiment 6 does not have a projecting section 24e, which is provided in the second coil 524 in embodiment 5. Therefore, as in Fig. 24 to Fig. As shown in Figure 27B, the second coil 624 has no parts that project in the radial direction X relative to the first coil 23 in the axial direction Z. Additionally, the length of the second partial coil section 624c is reduced in the axial direction Z.

[0161] With regard to the second coil 624, an inclined surface 624t1 of a tapered section 624t of the second coil 524 is attached to a side surface of the blind hole section 523z of the first coil 523 at a position along the inclined slot 523AS of the first coil 523 at an end section on the contact side 21 of the first sub-coil sections 523c of the first coil 523. This is the same as in embodiment 5.

[0162] In the present embodiment 6, as in embodiment 5, the length of the coil is determined not only by the length of the first sub-coil section 23c of the first coil 523, but also by the length of the second sub-coil section 624c of the second coil 624, thus increasing the length of the coil's conduction path CR. Since the second coil 624 does not have a projecting section 24e, the conductivity is reduced compared to embodiment 5. However, the projecting section 24e of the second coil 624 is also absent, and the length of the second sub-coil section 624c in the axial direction Z is reduced compared to the second sub-coil section 524c of embodiment 5, thus shortening the distance from the first coil 523 to the surface of the contact 21.

[0163] The blind hole diameter of the blind hole section 523z of the first coil 523 is denoted by m, as in Fig. 26 shown, and the outer diameter of the first coil contact sections 624d of the second coil 624 is denoted by d and the outer diameter of the second partial coil sections 624c of the second coil 624 is denoted by e, as in Fig. 25A shown. Then m ≥ d > e must be satisfied with regard to the assembly.

[0164] If an angle of the inclined slot 523AS of the first coil 523 relative to a plane perpendicular to the axial direction Z is denoted by α, and a tapering angle of the tapered section 624t of the second coil 24 relative to the plane perpendicular to the axial direction Z is denoted by β, as in Fig. As shown in 25D, it is desirable that the angles are defined with α = β.

[0165] Naturally, the blind hole section 224z or the through hole 224H of the second coil 224 according to embodiment 2 can be provided in the present embodiment. Naturally, the contact-side slot 24S2 of the second coil 24 according to embodiment 3 can be provided in the present embodiment. Naturally, there is no problem if edges of parts are rounded or chamfered during machining.

[0166] The vacuum valve 100 according to embodiment 6 has the same effects as that of embodiment 5.

[0167] As described above, since the second coil 624 does not have a protruding section 24e, the conductivity is reduced compared to embodiment 1, but the distance between the first coil 523 and the surface of the contact 21 is shortened, which can improve the magnetic flux density and the effective magnetic field area at the surface of the contact 21.

[0168] Although the disclosure above has been described with reference to various exemplary embodiments and implementations, it should be understood that the various features, aspects and functionalities described in one or more of the individual embodiments are not limited to the specific embodiment with which they were described, but can instead be applied individually or in various combinations to one or more of the embodiments of the disclosure.

[0169] It is therefore understood that numerous modifications, not illustrated by way of example, can be developed without departing from the scope of protection of the present disclosure. For instance, at least one of the components can be modified, added, or eliminated. At least one of the components mentioned in at least one of the preferred embodiments can be selected and combined with components mentioned in another preferred embodiment.

[0170] The following are a summary of the modes of execution of the present disclosure as additional notes. (Additional Note 1)

[0171] Vacuum valve comprising a pair of electrodes arranged such that they are opposite each other in an axial direction in a vacuum vessel and can be brought into contact with each other and separated from each other by means of electrode rods, wherein at least one of the electrodes has a coil provided 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 a ring-shaped fitting section that is adapted to the electrode rod, a multitude of first arm sections extending outwards from the pass section in a radial direction, and a multitude of first coil sections connected to the radially outer sides of the respective first arm sections and extending in an arc to one side in a circumferential direction, the second coil has a disc-shaped contact touching section that is in contact with the contact, a plurality of second arm sections extending outwards in the radial direction from the contact touching section, and a plurality of second coil part sections connected to the radially outer sides of the respective second arm sections and extending in an arc to another side in the circumferential direction, between the first coil and the second coil, first coil contact sections at distal ends of the second coil subsections of the second coil are each connected to distal ends in the circumferential direction of the first coil subsections of the first coil, thereby forming a plurality of current conduction paths, and a first space is formed between each first coil section of the first coil and a part, except for the first coil contact section, of the adjacent second coil section. (Additional Note 2)

[0172] vacuum valve according to additional note 1, wherein A second space is formed between every second coil section and the underside of the contact. (Additional Note 3)

[0173] vacuum valve according to additional note 1 or 2, wherein Each first coil section is provided with a first blind hole section which is recessed downwards in the axial direction, and through the first blind hole section the thickness in the axial direction of the first coil section is greater on an outer side in the radial direction than on an inner side. (Additional note 4)

[0174] vacuum valve according to one of the additional notes 1 to 3, wherein the first coil contact sections of the second coil are in contact with the distal ends in the circumferential direction of the first coil subsections in the axial direction and in the radial direction, and the first spaces are formed in the radial direction and in the axial direction between the first coil subsections and the second coil subsections. (Additional note 5)

[0175] vacuum valve according to additional note 4, wherein If a blind hole diameter of the first blind hole section of the first coil is designated by b, an outer diameter of the first coil contact sections of the second coil is designated by d, and an outer diameter of the second coil subsections, excluding the first coil contact sections, is designated by e, then the relationship b ≥ d > e is satisfied. (Additional Note 6)

[0176] vacuum valve according to one of the additional notes 1 to 5, wherein Every second coil section of the second coil has a ring-shaped first projection that projects outwards in a radial direction and extends circumferentially. (Additional note 7)

[0177] vacuum valve according to one of the additional notes 1 to 6, wherein the contact section of the second coil on a top side has a second blind hole section coaxial with the electrode rod in the axial direction, the contact on one underside has a cylindrical second projection in the axial direction that is coaxial with the electrode rod, and the second lead is adapted to the second dead-hole section. (Additional Note 8)

[0178] vacuum valve according to one of the additional notes 1 to 6, wherein the contact section of the second coil has a through-hole coaxial with the electrode rod, the contact on one underside has a cylindrical second projection in the axial direction that is coaxial with the electrode rod, and the second lead is adapted to the through hole. (Additional Note 9)

[0179] vacuum valve according to one of the additional notes 1 to 8, wherein The contact section of the second coil has contact-side slots that extend inwards in the radial direction from the base sections of the second coil subsections. (Additional Note 10)

[0180] vacuum valve according to one of the additional notes 1 to 9, wherein the first coil is formed from a cylindrical section and a bottom section, and the cylindrical section has a plurality of inclined slots provided obliquely to the axial direction, and the first coil section segments are formed by the plurality of inclined slots. (Additional Note 11)

[0181] vacuum valve according to additional note 10, wherein The bottom section has a multitude of bottom slots that are connected to the inclined slots and form the first arm sections. (Additional Note 12)

[0182] vacuum valve according to additional note 10 or 11, wherein The underside of each first coil contact section has a conical section whose thickness decreases in the axial direction towards the side to which current flows. (Additional Note 13)

[0183] vacuum valve according to additional note 12, wherein If an angle of the inclined slot of the first coil relative to a plane perpendicular to the axial direction is denoted by α and a cone angle of the conical section of the second coil relative to the plane perpendicular to the axial direction is denoted by β, then the relationship α = β is satisfied. DESCRIPTION OF REFERENCE MARKS 100 vacuum valve 1 insulating cylinder 3 bellows 1M metallization layer 2A fixed-side flange 2B moving-side flange G Leadership 3C Bellows cover 4A fixed-side electrode rod 4B moving-side electrode rod 4Ba Pass section AS arc protection 20A fixed-side electrode 20B, 220B, 420B, 520B, 620B, 820B, 920B moving-side electrode 21, 221 Contact 21a Blind hole section 22 Reinforcing element 22a Disc section 22b Column section 221P lead 23,523 first coil 23a, 523a, 823a, 923a pass section 23b, 523b, 823b, 923b arm section 23c, 523c first coil section 923c coil section 23S, 24S slot 24S2 contact-side slot 23z, 523z blind hole section 23z1, 523z1 side surface 23z2, 523z2 floor area 523A, 923A cylindrical section 523AS, 923AS inclined slot 523B, 923B floor section 523BS, 923BS bottom slot 24, 224, 324, 424, 524, 624 second coil 24a, 224a, 324a Contact section 24b, 424b arm section 24c, 424c, 524c, 624c second coil section 24d, 424d, 524d, 624d first coil contact section 24d1, 524d1 outer surface 24d², 524d² floor area 24e lead 24S slot 224H Through hole 224z blind hole section 524t, 624t conical section 524t1, 624t1 inclined surface 823, 923 coil electrode 823c, 923c coil section 823d, 923d power supply unit CR, 8CR, 9CR current path S3, S4 Room QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2002-150902

[0007] JP 2003-92050

[0007]

Claims

[1] Vacuum valve comprising a pair of electrodes arranged such that they are opposite each other in an axial direction in a vacuum container and can be brought into contact with each other and separated from each other by means of electrode rods, wherein at least one of the electrodes has a coil provided 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 a ring-shaped fitting section that is adapted to the electrode rod, a multitude of first arm sections extending outwards from the pass section in a radial direction, and a plurality of first coil sections connected to the outer sides in the radial direction of the respective first arm sections and extending in an arc to one side in a circumferential direction, the second coil having a disc-shaped contact section in contact with the contact, a plurality of second arm sections extending outwards from the contact section in the radial direction, and a plurality of second coil sections connected to the outer sides in the radial direction of the respective second arm sections and extending in an arc to another side in the circumferential direction, between the first coil and the second coil, first coil contact sections at distal ends of the second coil subsections of the second coil are each connected to distal ends in the circumferential direction of the first coil subsections of the first coil, thereby forming a plurality of current conduction paths, and a first space is formed between each first coil section of the first coil and a part, except for the first coil contact section, of the adjacent second coil section. [2] Vacuum valve according to claim 1, wherein a second space is formed between each second coil section and a bottom side of the contact. [3] Vacuum valve according to claim 1 or 2, wherein each first coil section is provided with a first blind hole section which is recessed downwards in the axial direction, and the thickness in the axial direction of the first coil section is greater in the radial direction on an outer side than on an inner side through the first blind hole section. [4] Vacuum valve according to one of claims 1 to 3, wherein the first coil contact sections of the second coil are in contact with the distal ends in the circumferential direction of the first coil subsections in the axial direction and in the radial direction, and the first spaces are formed in the radial direction and in the axial direction between the first coil subsections and the second coil subsections. [5] Vacuum valve according to claim 4, wherein if a blind hole diameter of the first blind hole section of the first coil is designated by b, an outer diameter of the first coil contact sections of the second coil is designated by d and an outer diameter of the second coil part sections, excluding the first coil contact sections, is designated by e, the relationship b ≥ d > e is satisfied. [6] Vacuum valve according to one of claims 1 to 5, wherein each second coil section of the second coil has an annular first projection which projects outwards in a radial direction and extends in a circumferential direction. [7] Vacuum valve according to any one of claims 1 to 6, wherein the contact section of the second coil on a top side has a second blind hole section coaxial with the electrode rod in the axial direction, the contact on one underside has a cylindrical second projection in the axial direction that is coaxial with the electrode rod, and the second lead is adapted to the second dead-hole section. [8] Vacuum valve according to any one of claims 1 to 6, wherein the contact section of the second coil has a through-hole coaxial with the electrode rod, the contact on one underside has a cylindrical second projection in the axial direction that is coaxial with the electrode rod, and the second lead is adapted to the through hole. [9] Vacuum valve according to any one of claims 1 to 8, wherein The contact section of the second coil has contact-side slots that extend inwards in the radial direction from the base sections of the second coil subsections. [10] Vacuum valve according to any one of claims 1 to 9, wherein the first coil is formed from a cylindrical section and a bottom section, and the cylindrical section has a plurality of inclined slots provided obliquely to the axial direction, and the first coil section segments are formed by the plurality of inclined slots. [11] Vacuum valve according to claim 10, wherein The bottom section has a multitude of bottom slots that are connected to the inclined slots and form the first arm sections. [12] Vacuum valve according to claim 10 or 11, wherein The underside of each first coil contact section has a conical section whose thickness decreases in the axial direction towards the side to which current flows. [13] Vacuum valve according to claim 12, wherein if an angle of the inclined slot of the first coil relative to a plane perpendicular to the axial direction is designated by α and a cone angle of the conical section of the second coil relative to the plane perpendicular to the axial direction is designated by β, the relationship α = β is satisfied.

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