Electrode structure and vacuum interrupter

Abstract

To provide a technique capable of contributing to easily providing a desired magnetic field generation function.SOLUTION: A plurality of rod-shaped pieces 7 divided in a coil circumferential direction are provided in coil parts 3 of electrodes 2a and 2b, and the rod-shaped pieces 7 adjacent to each other in the coil circumferential direction are engaged mutually such that the coil part is formed into a cylindrical shape as a whole. The rod-shaped piece 7 has a shape extending in an axial center direction. A projection 71a is provided at a position in a central part of one side end face 71, and a recess 72a is provided at a position in a central part of an other side end face 72. The mutually adjacent rod-shaped pieces 7 are engaged with each other such that a tip end 71b of the projection 71a in a protrusion direction of one of the mutually adjacent rod-shaped pieces is fitted into the recess 72a of the other. Between both the mutually adjacent rod-shaped pieces, there are provided a first slit-shaped clearance 73 in a shape extending from the projection 71a to the side of an electrode opposed direction and a second slit-shaped clearance 74 in a shape extending from the projection 71a to the opposite side in the electrode opposed direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electrode structure and a vacuum interrupter, and relates to a technique that can be applied to, for example, various electric power facilities. [Background technology]

[0002] For example, one example of a vacuum interrupter used in various electric power facilities has a configuration in which a pair of electrodes (a fixed electrode and a movable electrode) are provided in a vacuum vessel having an insulating cylindrical body so as to be freely connected and disconnected while facing each other (hereinafter, this opposing direction will be referred to simply as the electrode opposing direction) in the axial direction of the cylindrical body (the same direction as the extension direction of the axis 30 of the coil section 3 in Figures 2 and 3 described below; hereinafter, simply referred to as the axial direction). The vacuum vessel is provided with a pair of current-carrying shafts (leads) that support the back sides of each electrode (opposite the electrode opposing direction). One of the current-carrying shafts (e.g., the movable current-carrying shaft 12b described below) is supported inside the vacuum vessel via a bellows that is expandable and contractible in the axial direction.

[0003] With a vacuum interrupter configured as described above, one of the current-carrying shafts (the movable current-carrying shaft) can be moved axially while maintaining a vacuum state inside the vacuum vessel (specifically, on the outer periphery of the bellows inside the vacuum vessel), thereby making it possible to connect and disconnect the electrodes and open and close the contacts in accordance with the movement of the current-carrying shaft.

[0004] It is common for each electrode to be configured to have a magnetic field generating function in order to facilitate the desired breaking performance, etc. One example of this configuration includes a cylindrical coil section (magnetic field generating coil section) extending in the axial direction, a contact section provided on the electrode facing side (contact side) of the coil section, and an adapter section that supports the back side of the coil section (the side opposite to the electrode facing direction) on a current-carrying shaft (for example, Patent Documents 1 to 4).

[0005] When the electrodes of this configuration are brought into contact with or separated from each other to open or close the contacts, stress (such as axial inertial force or mechanical impact force) may be applied to the electrodes. Since the coil and contact sections have multiple slits to generate a magnetic field, the mechanical strength of the electrodes is likely to be reduced. As a result, it may be difficult to maintain the desired electrode characteristics (mechanical characteristics, electrical characteristics, etc.).

[0006] In the future, as vacuum interrupters are designed to operate at higher voltages and have larger capacities, the opening and closing speed of the contacts will increase and the operating force required for opening and closing the contacts will likely increase, which could result in greater stresses as described above.

[0007] Therefore, it has been considered to make it possible to withstand the stress and to easily maintain the desired electrode characteristics by, for example, providing a cylindrical reinforcing portion concentrically on the inner periphery of the coil portion, as necessary.

[0008] In order to make it easier for the slit holes to perform the desired magnetic field generation function, various shapes are being considered, such as a shape with a narrow slit width (width in the short direction), a shape with a long slit length (length in the long direction), and a shape that extends in the axial direction while winding around the circumferential direction of the coil section (hereinafter simply referred to as the coil circumferential direction) (hereinafter simply referred to as the winding shape). [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-086068 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-086067 [Patent Document 3] Japanese Patent Application Laid-Open No. 2003-151413 [Patent Document 4] Japanese Patent Application Publication No. 2018-181681 Summary of the Invention [Problem to be solved by the invention]

[0010] As a method for forming slit holes in the coil portion of each electrode, for example, a method is known in which a cylindrical body (coil portion) previously formed into a cylindrical shape is subjected to slit processing using a rotary blade or the like.

[0011] However, in the above-mentioned method of forming slits in a cylindrical body, it is sometimes impossible to form slit holes of the desired shape, and the desired magnetic field generating function cannot be obtained. For example, it is difficult to form slit holes with a narrow slit width, a long slit length, a spiral shape, etc. as desired, and there is a risk that the desired magnetic field generating function cannot be obtained.

[0012] The present invention has been made in view of the above technical problems, and aims to provide a technique that can contribute to making it easier to obtain a desired magnetic field generation function. [Means for solving the problem]

[0013] The electrode structure and vacuum interrupter according to the present invention can contribute to solving the above problems.

[0014] First, one aspect of the electrode structure comprises a pair of electrodes arranged in a vacuum vessel having an insulating cylindrical body, facing each other in the axial direction of the cylindrical body and capable of being moved toward and away from each other, and a pair of conductive shafts supporting each of the electrodes on opposite sides of the facing direction.

[0015] Each electrode has a cylindrical coil portion extending in the axial direction, a contact portion provided at an opening on the opposing side of the coil portion, and an adapter portion provided on the opposite side of the opposing direction of the coil portion and supported by the current-carrying shaft.

[0016] The coil portion comprises a plurality of rod-shaped pieces divided in the circumferential direction of the coil portion, and adjacent rod-shaped pieces in the circumferential direction engage with each other to form a cylindrical shape as a whole.

[0017] The rod-shaped piece has a shape extending in the axial direction, and a convex portion that protrudes toward one side in the circumferential direction is provided at the center of the axial direction on one side end face of the rod-shaped piece, which is on one side in the circumferential direction, and a concave portion that is recessed toward one side in the circumferential direction is provided at the center of the axial direction on the other side end face of the rod-shaped piece, which is on the other side in the circumferential direction.

[0018] The adjacent coils are engaged with each other by fitting the tip end of the protruding portion of one of the adjacent coils into the recess of the other adjacent coil, and between the adjacent coils there is provided a first slit-shaped gap which extends from the protruding portion in the opposing direction and penetrates radially through the coil portion, and a second slit-shaped gap which extends from the protruding portion to the opposite side of the opposing direction and penetrates radially through the coil portion.

[0019] The rod-shaped piece may extend in the axial direction in a position inclined from the axial direction toward the circumferential direction.

[0020] The rod-shaped piece may have an arc shape that extends in the axial direction while rotating in the circumferential direction.

[0021] The rod-shaped piece may extend in a Z-winding direction relative to the axial direction.

[0022] The rod-shaped piece of one of the electrodes may extend in a Z-winding direction relative to the axial direction, and the rod-shaped piece of the other of the electrodes may extend in an S-winding direction relative to the axial direction.

[0023] The adjacent convex portions and concave portions may be brazed together via a brazing material provided in an excess space between the convex portions and the concave portions.

[0024] The projection may be provided with a claw portion projecting outward from the outer periphery of the projection at a position between the base and the tip in the projection direction.

[0025] One aspect of the vacuum interrupter is characterized by having any one of the above electrode structures. [Effects of the Invention]

[0026] As described above, the present invention can contribute to making it easier to obtain a desired magnetic field generating function. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a schematic diagram (axial longitudinal cross-sectional view) illustrating the schematic configuration of a vacuum interrupter 1A according to an embodiment. [Figure 2] 2 is a schematic diagram illustrating an example of the schematic configuration of electrodes 2 (fixed electrode 2a, movable electrode 2b) of the vacuum interrupter 1A shown in FIG. 1. FIG. [Figure 3] FIG. 3 is a schematic diagram illustrating the schematic configuration of the coil portion 3 shown in FIG. 2 (a perspective view of the coil portion 3 of the electrode 2a). [Figure 4] FIG. 3 is a schematic diagram illustrating the schematic configuration of a rod-shaped piece 7. [Figure 5] 3 is a schematic diagram illustrating an example of engagement between adjacent rod-shaped pieces 7 (a partial schematic diagram of the coil portion 3). FIG. [Figure 6] 3 is a schematic diagram illustrating an example of engagement between adjacent rod-shaped pieces 7 (a partial schematic diagram of the coil portion 3). FIG. [Figure 7] 1. FIG. 4 is a schematic diagram illustrating another example of the schematic configuration of the electrodes 2 (fixed electrode 2a, movable electrode 2b) of the vacuum interrupter 1A shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0028] The electrode structure and vacuum interrupter according to the embodiment of the present invention are completely different from a configuration (hereinafter simply referred to as the conventional configuration) in which slit holes are formed in a cylindrical body (coil portion) that has been pre-formed into a cylindrical shape by slitting the coil portion of a pair of electrodes that are provided in a vacuum container, as shown in Patent Documents 1 to 4, for example.

[0029] In other words, each electrode of this embodiment has a coil portion that is divided into multiple rod-shaped pieces in the circumferential direction of the coil portion, and adjacent rod-shaped pieces in the circumferential direction of the coil (corresponding to adjacent rod-shaped pieces 7 described below) engage with each other, thereby forming a cylindrical shape as a whole.

[0030] The rod-shaped piece has a shape extending in the axial direction, and a convex portion protruding to one side in the circumferential direction of the coil is provided at a central portion in the axial direction of one end face of the rod-shaped piece, which is on one side in the circumferential direction of the coil, and a concave portion recessed to one side in the circumferential direction of the coil is provided at a central portion in the axial direction of the other end face of the rod-shaped piece, which is on the other side in the circumferential direction of the coil.

[0031] Adjacent rod-shaped pieces engage with each other by fitting the tip end of the protrusion of one of the adjacent rod-shaped pieces into the recess of the other adjacent rod-shaped piece, thereby forming a first slit-shaped gap extending from the protrusion toward the electrode opposing direction and penetrating in the radial direction of the coil part (hereinafter simply referred to as the coil radial direction), and a second slit-shaped gap extending from the protrusion to the opposite side of the electrode opposing direction and penetrating in the coil radial direction.

[0032] The rod-shaped piece may simply have a shape extending in the axial direction, or may have a shape extending in the axial direction at an angle from the axial direction toward the coil circumferential direction, or may have a shape (arc shape) extending in the axial direction while rotating in the coil circumferential direction (extending in the Z-winding direction or S-winding direction).

[0033] According to this embodiment, by simply lining up multiple rod-shaped pieces in the circumferential direction of the coil and engaging adjacent rod-shaped pieces with each other, a first slit-shaped gap and a second slit-shaped gap can be formed between the adjacent pieces, which can have a magnetic field generating function.

[0034] The shapes of these first slit-shaped gaps and second slit-shaped gaps can be variously configured by appropriately designing the shape of the rod-shaped pieces, for example, a shape with a narrow slit width, a shape with a long slit length, a spiral shape, etc.

[0035] That is, it is easier to design and form the rod-shaped pieces in various ways so as to obtain the desired first slit-shaped gap and second slit-shaped gap than to form slit holes by slitting a cylindrical body as in the conventional configuration. Therefore, according to this embodiment, it is possible to sufficiently contribute to making it easier to obtain the desired magnetic field generation function.

[0036] As described above, this embodiment may be configured such that, in the coil portion of each electrode, a plurality of rod-shaped pieces are connected in the circumferential direction of the coil, adjacent rod-shaped pieces are engaged with each other (by fitting the protrusions into the recesses), and a first slit-shaped gap and a second slit-shaped gap are formed between the adjacent rod-shaped pieces. Therefore, it is possible to appropriately apply common technical knowledge in various fields (vacuum interrupter field, electrode field, magnetic field field, etc.) and to appropriately refer to prior art documents as necessary to modify the design, and the following examples are given as examples.

[0037] In the following embodiments, detailed descriptions will be omitted as appropriate, for example, by referring to the same reference numerals for similar contents.

[0038] Example <Examples of main configurations of vacuum interrupters> An example of the schematic configuration of a vacuum interrupter 1A according to an embodiment will be described with reference to Figure 1. This vacuum interrupter 1A includes a vacuum vessel 1 having an insulating cylindrical body 10 whose one axial side (fixed side) is sealed with a fixed flange 1a and whose other axial side (movable side) is sealed with a movable flange 1b.

[0039] In the case of the cylindrical main body 10 shown in Figure 1, a cylindrical shield (arc shield) 11 surrounding the outer periphery of the fixed electrode 2a and the movable electrode 2b described below is supported on the inner periphery of the cylindrical main body 10.

[0040] A columnar fixed-side current-carrying shaft 12a is provided at the center of the fixed-side flange 1a so as to extend from the center to the other axial side (extending from one axial side to the other axial side in FIG. 1). The fixed electrode 2a is supported at the end of the fixed-side current-carrying shaft 12a on the other axial side.

[0041] A flange through hole 13 is provided in the center of the movable side flange 1b, and extends axially through the center. A columnar movable side current-carrying shaft 12b is inserted into the flange through hole 13 and extends axially.

[0042] The movable electrode 2b is supported at one axial end of the movable current-carrying shaft 12b. The one axial end of the movable current-carrying shaft 12b (the movable electrode 2b side) is supported inside the vacuum vessel 1 of the movable flange 1b via a cylindrical bellows 14 that is axially expandable and contractible and is arranged coaxially with the movable current-carrying shaft 12b.

[0043] The fixed electrode 2a and the movable electrode 2b are provided with, for example, a first slit-shaped gap 73 and a second slit-shaped gap 74 (described later) so as to have a magnetic field generating function.

[0044] According to the vacuum interrupter 1A configured as described above, the movable side current-carrying shaft 12b (and the movable electrode 2b) can be moved in the axial direction while maintaining the vacuum state inside the vacuum vessel 1 (specifically, the outer periphery of the bellows 14 inside the vacuum vessel 1), and the movable electrode 2b can be moved toward or away from the fixed electrode 2a in accordance with the movement of the movable side current-carrying shaft 12b.

[0045] The materials, shapes, etc. of each component of the vacuum interrupter 1A, as well as the processing methods, assembly methods, and mounting methods of each component, can be appropriately applied in various ways depending on the intended use of the vacuum interrupter 1A, etc.

[0046] For example, among the components of the vacuum interrupter 1A, an insulating material (e.g., alumina ceramics) may be used for the cylindrical body 10, and a metal material (e.g., stainless steel (SUS304), oxygen-free copper, titanium) may be used for the other components. However, it is preferable to select the appropriate material taking into account the possibility of expansion (thermal expansion) and residual stress occurring when assembling the components.

[0047] <Main configuration examples of the fixed electrode 2a and the movable electrode 2b> The fixed electrode 2a and the movable electrode 2b may be configured to have a magnetic field generating function for the purpose of facilitating the desired blocking performance, and may be configured in the manners shown in FIGS. 1 to 3, for example.

[0048] The fixed electrode 2a and the movable electrode 2b may have the same configuration, and hereinafter, as needed, they will be collectively referred to simply as the electrode 2. Furthermore, the fixed-side current-carrying shaft 12a and the movable-side current-carrying shaft 12b will hereinafter, as needed, be collectively referred to simply as the current-carrying shaft 12.

[0049] 1 to 3 includes a cylindrical coil portion (magnetic field generating coil portion) 3 extending in the axial direction, a disk-shaped contact portion 4 provided at an open end face 31 on the electrode facing side (contact side) of the coil portion 3, and a disk-shaped adapter portion 5 supporting an open end face 32 on the back side (opposite the electrode facing direction) of the coil portion 3 on a current-carrying shaft 12. In the case of the coil portion 3 shown in FIG. 3, a reinforcing portion 6 having a cylindrical peripheral wall 60 with a smaller diameter than the coil portion 3 is fitted concentrically around the inner periphery of the coil portion 3.

[0050] The material, shape, etc. of each electrode element of electrode 2, as well as the processing method, assembly method, and installation method of each electrode element, can be suitably applied in various modes depending on the intended use of vacuum interrupter 1A. For example, it is preferable to use a metal material with high conductivity, such as oxygen-free copper, for coil portion 3, contact portion 4, and adapter portion 5. On the other hand, it is preferable to use a metal material with high mechanical strength, such as stainless steel (SUS304), for reinforcing portion 6.

[0051] Furthermore, the electrode elements may be assembled using a brazing material or the like. For example, if the coil portion 3 is made of oxygen-free copper and the reinforcing portion 6 is made of stainless steel, a brazing material with a lower melting point than the oxygen-free copper may be used. For example, an Ag-based material (such as an Ag-Cu-based material) may be used.

[0052] <Configuration example of coil section 3> The coil section 3 has a plurality of rod-shaped pieces 7 (29 pieces in Figure 3) divided in the circumferential direction of the coil of the coil section 3, and adjacent rod-shaped pieces 7 in the circumferential direction of the coil (hereinafter simply referred to as adjacent rod-shaped pieces 7) engage with each other, thereby forming a cylindrical (cylindrical) shape as a whole.

[0053] The rod-shaped piece 7 has a shape that extends in the axial direction. A convex portion 71a that protrudes toward one side in the axial direction is provided at the center of one end face 71 of the rod-shaped piece 7, which is on one side in the circumferential direction of the coil. Furthermore, a concave portion 72a that is recessed toward one side in the circumferential direction of the coil is provided at the center of the axial direction of another end face 72 of the rod-shaped piece 7, which is on the other side in the circumferential direction of the coil.

[0054] The adjacent rod-shaped pieces 7 are configured such that the opposing convex portions 71a and concave portions 72a engage with each other. Specifically, the protruding tip portions 71b of the convex portions 71a of the other adjacent rod-shaped pieces 7 are fitted into the concave portions 72a of one of the adjacent rod-shaped pieces 7, thereby engaging with each other.

[0055] Between adjacent rod-shaped pieces 7, a first slit-shaped gap 73 is formed, which extends from the convex portion 71a toward the electrode opposing direction (in the figure, it is further opened toward the electrode opposing direction) and penetrates in the coil radial direction, and a second slit-shaped gap 74 is formed which extends from the convex portion 71a to the opposite side of the electrode opposing direction (in the figure, it is further opened toward the opposite side) and penetrates in the coil radial direction.

[0056] The rod-shaped pieces 7 do not simply extend in the axial direction, but may extend in the axial direction while tilting from the axial direction toward the coil circumferential direction (tilting along the Z-winding direction in Figs. 2 and 3), as shown in Figs. 2 and 3. The tilt angle (angle α in Fig. 2) formed by such tilted rod-shaped pieces 7 and the axial direction can be set appropriately and is not particularly limited.

[0057] Furthermore, the rod-shaped pieces 7 having an inclined shape as described above may be formed into an arc shape (an arc shape that convex outward in the coil radial direction) that extends in the axial direction while winding in the coil circumferential direction (extending in the Z-winding direction in Figures 2 and 3) by appropriately bending the rod-shaped pieces 7. The angle of rotation of such arc-shaped rod-shaped pieces 7 in the coil circumferential direction (the angle of rotation θ about the axial center 30 in Figure 3) can also be set appropriately and is not particularly limited.

[0058] Such arc-shaped rod-shaped pieces 7 may make it easier to form a cylindrical coil section 3, even if the rod-shaped pieces 7 are designed to have a large length in the circumferential direction of the coil. Furthermore, by forming the inner surface 7a of the rod-shaped pieces 7 in the radial direction of the coil and the outer surface 7b of the rod-shaped pieces 7 in the radial direction of the coil into a curved surface that is convex outward in the radial direction of the coil, it may be easier to form a cylindrical coil section 3.

[0059] As described above, by making the rod-shaped piece 7 inclined or arc-shaped, the first slit-shaped gap 73 and the second slit-shaped gap 74 can be made into, for example, a shape with a long slit length (a shape that is longer than a shape that simply extends in the axial direction) or a spiral shape.

[0060] 2 and 3, the coil section 3 has the effect of directing the current flowing through the coil section 3 in the circumferential direction of the coil, thereby generating a magnetic field toward the axial direction and the outer radial direction of the coil. For example, when an arc (a flow of material carrying an electric charge) occurs in the axial direction of an arc that may occur when the electrode 2 is opened, a force acts on the outer radial direction of the coil and the circumferential direction of the coil, making the arc more likely to become longer. This increases the potential difference required to maintain the arc, hindering the growth of the arc, and as a result, makes it possible to make the arc more likely to decay.

[0061] The main current flowing through the coil portion 3 flows through each rod-shaped piece 7, and is prevented from flowing through the engagement portions (such as brazed portions) between the protrusions 71a and recesses 72a of adjacent rod-shaped pieces 7. In other words, if the rod-shaped pieces 7 are made of a highly conductive metal material, the main current flowing through the coil portion 3 will flow directly through the metal material. Therefore, even if the coil portion 3 is made up of multiple rod-shaped pieces 7, it is possible to sufficiently prevent the electrical resistance from increasing.

[0062] Furthermore, compared with the conventional configuration, it is easier to form the first slit gap 73 and the second slit gap 74 with long slit lengths, and high breaking performance (for example, DC breaking ability) in the electrode 2 can be easily obtained.

[0063] The opening end face 31 of the coil portion 3 (the end face on the electrode opposing side of each rod-shaped piece 7; hereinafter simply referred to as the opposing side end face) and the opening end face 32 (the end face on the opposite side of the electrode opposing side of each rod-shaped piece 7; hereinafter simply referred to as the opposite side end face) can be appropriately assembled to the contact portion 4 and the adapter portion 5, respectively, and are not particularly limited.

[0064] For example, recesses (not shown) into which the electrode-facing side end faces of the rod-shaped pieces 7 can be fitted may be provided at positions where the electrode-facing side end faces of the rod-shaped pieces 7 face each other in the contact portion 4. This allows the electrode-facing side end faces of the rod-shaped pieces 7 to be fitted into the recesses of the contact portion 4 for assembly, which may result in good support and fixation.

[0065] Similarly, recesses (not shown) into which the opposite end faces of the rod-shaped pieces 7 can fit can be provided at positions where the opposite end faces of the rod-shaped pieces 7 face each other in the adapter part 5. This allows the opposite end faces of the rod-shaped pieces 7 to be fitted into the recesses in the adapter part 5 for assembly, which may result in good support and fixation.

[0066] <Configuration example of rod-shaped piece 7> The multiple rod-shaped pieces 7 constituting the coil section 3 only need to be able to engage adjacent rod-shaped pieces 7 at their protrusions 71a and recesses 72a when the rod-shaped pieces 7 are lined up in the circumferential direction, and to form first slit-shaped gaps 73 and second slit-shaped gaps 74 between the adjacent rod-shaped pieces 7 (so as to obtain a magnetic field generating function), and the shape, number of rod-shaped pieces 7, processing method, etc. can be appropriately set depending on, for example, the target electrode 2. For example, the rod-shaped pieces 7 may simply be shaped to extend in the axial direction, or may be shaped like an inclined or arc as shown in Figures 2 and 3.

[0067] The protrusion 71a may simply have a shape that protrudes to one side in the circumferential direction of the coil, or may have a shape that protrudes in a direction that is inclined toward the electrode opposing direction (diagonally upward to the right in FIG. 2) like the electrode 2a in FIG. 2, or a shape that protrudes in a direction that is inclined to the opposite electrode opposing direction (diagonally upward to the right in FIG. 2) like the electrode 2a in FIG. 2.

[0068] The recess 72a may also be simply recessed on one side in the circumferential direction of the coil, or may be recessed in a direction inclined toward the electrode opposing direction (diagonally upward to the right in FIG. 2) as in the electrode 2a in FIG. 2, or recessed in a direction inclined toward the opposite electrode opposing direction (diagonally upward to the right in FIG. 2) as in the electrode 2a in FIG. 2.

[0069] The rod-shaped piece 7 can be formed by various processing methods, such as by appropriately processing a columnar metal member (punching, wire processing, cutting, polishing, etc.), by appropriately molding a metal material, or by bending, etc. as necessary.

[0070] For example, when a plurality of rod-shaped pieces 7 as shown in FIG. 4 are created and the rod-shaped pieces 7 are used to form the coil portion 3 as shown in FIG. 3, a design example can be one that satisfies the following formulas (1) to (4). In the following formulas (1) to (4), Do is the outer diameter of the coil portion 3 in the radial direction of the coil, Di is the inner diameter of the coil portion 3 in the radial direction of the coil, N is the number of rod-shaped pieces 7 (the number divided in the circumferential direction of the coil; 29 in FIG. 3), s is the slit width of each of the first slit-shaped gaps 73 and the second slit-shaped gaps 74, and h is the dimension in the axial direction of the coil portion 3. θ is the rotation angle θ (rad) around the axis 30 shown in FIG. 3, t' is the dimension in the radial direction of the coil shown in FIG. 3, and L', ΔL', d', s', and D' are the dimensions shown in FIG. 4.

[0071]

number

[0072]

number

[0073]

number

[0074]

number

[0075] In these equations (1) to (4), by appropriately setting the rotation angle θ to be large, it is possible to lengthen the rod-shaped piece 7 in the circumferential direction of the coil, and accordingly, it is possible to similarly lengthen the first slit-shaped gap 73 and the second slit-shaped gap 74 in the circumferential direction.

[0076] <Example of engagement between adjacent rod-shaped pieces 7> When adjacent rod-shaped pieces 7 are to be engaged with each other by fitting the protruding tip 71b of the protruding portion 71a of the other adjacent rod-shaped piece 7 into the recess 72a of one of the adjacent rod-shaped pieces 7 (hereinafter simply referred to as the engaged state), the protruding portion 71a and the recess 72a can be brazed using a brazing material 75 as described below.

[0077] 5 and 6, the axial dimension of the protrusion 71a is set smaller than the axial dimension of the recess 72a. That is, when the adjacent rod-shaped pieces 7 are engaged with each other, an excess space 76 is provided between the protrusion 71a and the recess 72a. This makes it possible to place a brazing material 75 in the excess space 76 before engaging the adjacent rod-shaped pieces 7.

[0078] An example of brazing adjacent rod-shaped pieces 7 together using the brazing material 75 placed in the excess space 76 in this manner is to carry out the brazing material placement process, assembly process, and melting process in this order as shown below.

[0079] First, in the brazing material placement process, when assembling a plurality of rod-shaped pieces 7 in a line in the circumferential direction, brazing material 75 is placed in advance in the region of the excess space 76 between adjacent rod-shaped pieces 7. Thereafter, in the assembling process, the protruding tip 71b of the protruding portion 71a of one of the adjacent rod-shaped pieces 7 is fitted into the recess 72a of the other adjacent rod-shaped piece 7 to establish an engaged state, thereby obtaining an assembly in which a plurality of rod-shaped pieces 7 are assembled in a line in the circumferential direction (for example, an assembly having the same shape as the coil portion 3 shown in FIG. 3; hereinafter, simply referred to as a rod-shaped piece 7 assembly).

[0080] Next, in the melting step, the brazing material 75 is heated to a molten state, for example, by placing the rod-shaped piece 7 assembly in a heating furnace. The molten brazing material 75 penetrates widely between the protrusions 71a and the recesses 72a (between the respective engagement surfaces) by, for example, capillary action, and then cools down and solidifies. This results in the protrusions 71a and the recesses 72a being brazed together.

[0081] When the brazing material 75 is brought into a molten state in the melting process, the positioning orientation of the rod-shaped piece 7 assembly (for example, the positioning orientation in a heating furnace) is not particularly limited, but if the top-to-bottom direction of the rod-shaped piece 7 assembly is the same as the vertical direction shown in Figures 5 and 6 (hereinafter simply referred to as the top-to-bottom direction), the brazing material 75 in the molten state tends to flow downward as shown in Figures 5 and 6.

[0082] For example, in the case of the rod-shaped piece 7 shown in Figure 5, the recess 72a is recessed diagonally downward as shown in the figure, so even if the rod-shaped piece 7 assembly is in the vertical direction as shown in Figure 5 during the melting process, the molten brazing material 75 is likely to remain within the recess 72a.

[0083] On the other hand, in the case of the rod-shaped piece 7 shown in Fig. 6, a claw portion 71d is provided between the base portion 71c and the tip end 71b of the protruding portion 71a, protruding outward from the outer periphery of the protruding portion 71a (protruding upward in the vertical direction in Fig. 6). As a result, the brazing material 75 placed in the excess space 76 is positioned between the claw portion 71d and the bottom portion 72b of the recessed portion 72a. Even if the rod-shaped piece 7 assembly is in the vertical direction in Fig. 6 during the melting process, the molten brazing material 75 tends to remain in the recessed portion 72a.

[0084] <Configuration example of electrode 2> In the case of the electrodes 2a and 2b shown in FIG. 2, the respective rod-shaped pieces 7 extend in the same Z-winding direction relative to the axial direction, resulting in a so-called vertical magnetic field electrode configuration, but this is not limited to this.

[0085] For example, as shown in FIG. 7, the rod-shaped piece 7 of one of the electrodes 2a and 2b (electrode 2a in the case of FIG. 7) may be extended in an S-winding direction relative to the axial direction, thereby enabling a so-called contralateral electrode configuration.

[0086] <Configuration example of contact part 4, adapter part 5, and reinforcing part 6> The contact portion 4 may be configured to obtain a desired magnetic field generating function, similar to the coil portion 3. As a specific example, as shown in Patent Documents 1 to 4, a plurality of slit holes extending in the radial direction and penetrating the thickness direction (axial direction) of the contact portion 4 are formed at predetermined intervals in the circumferential direction of the contact portion 4.

[0087] The adapter part 5 may be configured in various ways as long as it can support the open end face 34 on the back side (opposite the facing direction) of the coil part 3 on the current-carrying shaft 12. For example, in the case of the adapter part 5 shown in the figure, the center part of the adapter part 5 is configured to be supported by the current-carrying shaft 12.

[0088] The reinforcing portion 6 may be configured to reinforce the electrode 2 by, for example, surface-joining the outer peripheral surface of the peripheral wall 60 to the inner peripheral surface side of the coil portion 3 (the surface 7a side of the rod-shaped piece 7), and various embodiments can be applied.

[0089] This reinforcing portion 6 is not an essential component of the electrode 2, and may be omitted as appropriate, for example, if the electrode 2 has a certain level of mechanical strength and the desired electrode characteristics (mechanical characteristics, electrical characteristics, etc.) are obtained.

[0090] Although the present invention has been described in detail above only with respect to the specific examples, it will be apparent to those skilled in the art that various modifications are possible within the scope of the technical concept of the present invention, and it is natural that such modifications fall within the scope of the claims. [Explanation of symbols]

[0091] 1A...Vacuum interrupter 2a...Fixed electrode, 12a...Fixed side current-carrying shaft 2b...Movable electrode, 12b...Movable side current-carrying shaft 3...Coil section 4...Contact point 5...Adapter part 6...Reinforcement 7...rod-shaped piece, 71a...projection portion, 71b...tip portion in the protruding direction, 71c...base portion, 71d...claw portion, 72a...recess portion, 72b...bottom portion, 73...first slit-shaped gap, 74...second slit-shaped gap, 75...brazing material, 76...surplus space

Claims

1. A pair of electrodes are provided in a vacuum vessel having an insulating cylindrical body, the electrodes being opposed to each other in an axial direction of the cylindrical body and being capable of moving toward and away from each other; a pair of current-carrying shafts supporting the electrodes on opposite sides of the opposing direction; Equipped with Each of the electrodes is a cylindrical coil portion extending in the axial direction; a contact portion provided at an opening on the opposing side of the coil portion; an adapter portion provided on the opposite side of the coil portion in the opposing direction and supported by the current-carrying shaft; and the coil portion includes a plurality of rod-shaped pieces divided in a circumferential direction of the coil portion, and adjacent rod-shaped pieces in the circumferential direction are engaged with each other to form a cylindrical shape as a whole; The rod-shaped piece is A shape extending in the axial direction, a protrusion having a shape that protrudes toward one side in the circumferential direction is provided at a central portion in the axial direction of one end face of the rod-shaped piece, the one end face being on one side in the circumferential direction, a recessed portion recessed toward one side in the circumferential direction is provided in a central portion in the axial direction of an end surface of the rod-shaped piece on the other side in the circumferential direction, The adjacent pair of the protruding portions are engaged with each other by fitting the recessed portion of one of the adjacent pair of the protruding portions of the other adjacent pair of the protruding portions into the recessed portion of the other adjacent pair of the protruding portions, Between the adjacent two, a first slit-shaped gap extending from the protrusion toward the opposing direction and penetrating the coil portion in a radial direction; a second slit-shaped gap extending from the protrusion to the opposite side of the opposing direction and penetrating the coil portion in a radial direction; An electrode structure characterized in that

2. 2. The electrode structure according to claim 1, wherein the rod-shaped piece extends in the axial direction while tilting from the axial direction toward the circumferential direction.

3. 2. The electrode structure according to claim 1, wherein the rod-shaped piece has an arc shape that extends in the axial direction while winding in the circumferential direction.

4. 2. The electrode structure according to claim 1, wherein the rod-shaped piece extends in a Z-winding direction relative to the axial direction.

5. The rod-shaped piece of one of the electrodes extends in a Z-winding direction relative to the axial direction, The rod-shaped piece of the other of the electrodes extends in an S-winding direction with respect to the axial direction.

2. The electrode structure according to claim 1.

6. 2. The electrode structure according to claim 1, wherein the adjacent protrusions and recesses are brazed together via a brazing material provided in an excess space between the protrusions and recesses.

7. 7. The electrode structure according to claim 6, wherein a claw portion is provided between the base of the protrusion and the tip end in the protruding direction, the claw portion protruding outward from the outer periphery of the protrusion.

8. A vacuum interrupter comprising the electrode structure according to any one of claims 1 to 7.

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