Electrode structure, vacuum interrupter

Abstract

Provided is a technology capable of contributing to making it easier to obtain a desired magnetic field generation function. 【Solution means】In the coil portions 3 of the electrodes 2a and 2b, a plurality of rod-shaped pieces 7 divided in the coil circumferential direction are provided, and the adjacent ones in the coil circumferential direction of each of the rod-shaped pieces 7 are engaged with each other to form a cylindrical shape as a whole. The rod-shaped piece 7 has a shape extending in the axial center direction, a convex portion 71a is provided at the center position of one end face 71, and a concave portion 72a is provided at the center position of the other end face 72. The adjacent rod-shaped pieces 7 are engaged with each other by fitting the protruding direction tip portion 71b side of the convex portion 71a of the other into the concave portion 72a of one of the adjacent ones. Between the two adjacent ones, a first slit-shaped gap 73 having a shape extending from the convex portion 71a toward the electrode facing direction side and a second slit-shaped gap 74 having a shape extending from the convex portion 71a toward the opposite side of the electrode facing direction are provided.

Description

Technical Field

[0001] The present invention relates to an electrode structure and a vacuum interrupter, and more particularly to a technology applicable to various power facilities and the like.

Background Art

[0002] As an example of a vacuum interrupter applied to various power facilities and the like, in a vacuum vessel having an insulating cylindrical body, a pair of electrodes (a fixed electrode and a movable electrode) are provided so as to be able to approach and separate from each other in a posture facing each other in the axial direction of the cylindrical body (the same direction as the extending direction of the axis 30 of the coil portion 3 in FIGS. 2 and 3 described later; hereinafter, simply referred to as the axial direction as appropriate). A pair of current-carrying shafts (leads) are provided to support the back side (the side opposite to the electrode facing direction) of each electrode. Further, one of the current-carrying shafts (for example, the movable-side current-carrying shaft 12b described later) is supported inside the vacuum vessel via a bellows that can expand and contract in the axial direction.

[0003] According to such a vacuum interrupter, while maintaining the vacuum state inside the vacuum vessel (specifically, the outer peripheral side of the bellows inside the vacuum vessel), one of the current-carrying shafts (the movable-side current-carrying shaft) can be moved in the axial direction. As a result, the electrodes can be brought into contact with and separated from each other according to the movement of the current-carrying shaft, and the contacts can be opened and closed.

[0004] In each electrode, it is common to configure it to have a magnetic field generation function for the purpose of easily exhibiting desired interruption performance. As an example of this configuration, there is a configuration having a cylindrical coil portion (magnetic field generation coil portion) extending in the axial direction, a contact portion provided on the electrode facing direction side (contact point side) of the coil portion, and an adapter portion that supports the back side (the side opposite to the electrode facing direction) of the coil portion on the current-carrying shaft (for example, Patent Documents 1 to 4).

[0005] When opening and closing the contact by separating and contacting each electrode configured as described above, stress (for example, inertial force or mechanical impact force in the axial direction) may be applied to the electrode. Since a plurality of slit holes are provided in the coil portion, the contact portion, etc. so as to have a magnetic field generation function, the mechanical strength of the electrode etc. tends to be low. As a result, it is conceivable that it may be difficult to maintain desired electrode characteristics (mechanical characteristics, electrical characteristics, etc.).

[0006] In the future, when the high voltage and large capacity of the vacuum interrupter are to be achieved, the opening and closing speed of the contact will increase, and the operating force required for the opening and closing may also increase. Therefore, there is a possibility that the stress as described above may also increase.

[0007] Therefore, as needed, it has been considered to provide a cylindrical reinforcing portion concentrically on the inner peripheral side of the coil portion etc. so as to withstand the stress and make it easier to maintain desired electrode characteristics.

[0008] Also in the slit hole, in consideration of making it easier to exhibit the desired magnetic field generation function, various shapes are 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 extending in the axial direction while swirling in the circumferential direction of the coil portion (hereinafter, simply referred to as the swirling shape as appropriate).

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

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

[0011] However, in the method of performing slit processing on a cylindrical body as described above, it may not be possible to form a slit hole having a desired shape, and a desired magnetic field generation function may not be obtained. For example, it is difficult to form slit holes having a narrow slit width, a long slit length, a swirling shape, etc. as desired, and there is a risk that a desired magnetic field generation function may not be obtained.

[0012] The present invention has been made in view of such technical problems, and an object thereof is to provide a technology that can contribute to making it easier to obtain a desired magnetic field generation function.

Means for Solving the Problems

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

[0014] First, one aspect of the electrode structure includes a pair of electrodes that are provided so as to be able to approach and separate from each other while facing each other in the axial direction of a cylindrical body in a vacuum container having an insulating cylindrical main body, and a pair of energization shafts that support the respective electrodes on the opposite sides of the facing direction.

[0015] Each of the electrodes has a cylindrical coil portion extending in the axial direction, a contact portion provided at an opening portion on the facing direction side of the coil portion, and an adapter portion provided on the opposite side of the facing direction of the coil portion and supported by the energization shaft.

[0016] The coil portion includes a plurality of rod-shaped pieces divided in the circumferential direction of the coil portion, and adjacent ones of the 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 at the position of the central portion in the axial direction of one end face on one side in the circumferential direction of the rod-shaped piece, a convex portion having a shape protruding to one side in the circumferential direction is provided, and at the position of the central portion in the axial direction of the other end face on the other side in the circumferential direction of the rod-shaped piece, a concave portion having a shape recessed to one side in the circumferential direction is provided.

[0018] The adjacent ones are engaged with each other by fitting the tip end side in the protruding direction of the convex portion of the other of the adjacent ones into the concave portion of one of the adjacent ones, and between both of the adjacent ones, there are provided a first slit-shaped gap having a shape extending from the convex portion to the opposite direction side and penetrating in the radial direction of the coil portion, and a second slit-shaped gap having a shape extending from the convex portion to the opposite side of the opposite direction and penetrating in the radial direction of the coil portion.

[0019] The rod-shaped piece may be characterized in that it extends in the axial direction in a posture inclined from the axial direction to the circumferential direction side.

[0020] The rod-shaped piece may be characterized in that it forms an arc shape extending in the axial direction while turning in the circumferential direction.

[0021] The rod-shaped piece may be characterized in that it extends in the Z-winding direction with respect to the axial direction.

[0022] Among the respective electrodes, the rod-shaped piece of one extends in the Z-winding direction with respect to the axial direction, and the rod-shaped piece of the other extends in the S-winding direction with respect to the axial direction.

[0023] The adjacent ones may be characterized in that they are brazed via a brazing material installed in the surplus space between both the convex portion and the concave portion.

[0024] A claw portion protruding to the outer peripheral side of the convex portion may be provided at a position between the root portion of the convex portion and the tip portion in the protruding direction.

[0025] One aspect of the vacuum interrupter is characterized by including any of the electrode structures. [Advantages of the Invention]

[0026] As described above, according to the present invention, it is possible to contribute to making it easier to obtain a desired magnetic field generation function. [Brief Description of the Drawings]

[0027]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

[0028] The electrode structure and the vacuum interrupter according to the embodiment of the present invention are completely different from a configuration (hereinafter simply referred to as the conventional configuration as appropriate) in which a slit process is performed on a cylindrical body (coil portion) that is preliminarily formed into a cylindrical shape in the coil portion of a pair of electrodes provided in a vacuum vessel as shown in Patent Documents 1 to 4, for example.

[0029] That is, each electrode of the present embodiment includes a plurality of rod-shaped pieces divided in the coil circumferential direction in the coil portion, and adjacent ones of the rod-shaped pieces in the coil circumferential direction (corresponding to adjacent ones of the rod-shaped pieces 7 described later) engage with each other to form a cylindrical shape as a whole.

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

[0031] Then, adjacent ones of the rod-shaped pieces engage with each other by fitting the tip end side in the protruding direction of the convex portion of the other of the adjacent ones into the concave portion of one of the adjacent ones. As a result, between the two adjacent ones, a first slit-shaped gap having a shape extending from the convex portion toward the electrode facing direction side and penetrating in the radial direction of the coil portion (hereinafter simply referred to as the coil radial direction as appropriate) and a second slit-shaped gap having a shape extending from the convex portion toward the opposite side of the electrode facing direction and penetrating in the coil radial direction are provided.

[0032] The rod-shaped piece may simply have a shape extending in the axial direction, a shape extending in the axial direction with a posture inclined from the axial direction toward the coil circumferential direction side, or a shape extending in the axial direction while turning in the coil circumferential direction (extending in the Z winding direction or the S winding direction) (arc shape).

[0033] According to such an embodiment of the present invention, by simply arranging a plurality of rod-shaped pieces in the coil circumferential direction and engaging adjacent ones of the rod-shaped pieces with each other, a first slit-shaped gap and a second slit-shaped gap having a magnetic field generating function can be provided between the two adjacent ones.

[0034] In the shapes of these first slit-shaped gap and second slit-shaped gap, by appropriately designing the shape of the rod-shaped piece, various modes such as, for example, a shape with a narrow slit width, a shape with a long slit length, a turning shape, etc. can be adopted.

[0035] That is, designing and forming the rod-shaped piece in various modes so as to obtain a desired first slit-shaped gap and second slit-shaped gap is easier compared to the case of forming a slit hole by performing slit processing on a cylindrical body as in the conventional configuration. Therefore, according to this embodiment, it can sufficiently contribute to making it easier to obtain a desired magnetic field generating function.

[0036] As described above, in this embodiment, in the coil portion of each electrode, a plurality of rod-shaped pieces are arranged in the coil circumferential direction and adjacent ones of the rod-shaped pieces are engaged with each other (the convex portion is fitted into the concave portion for engagement), and a mode in which a first slit-shaped gap and a second slit-shaped gap are formed between the two adjacent ones may be adopted. Therefore, it is possible to appropriately apply the common technical knowledge in various fields (such as the vacuum interrupter field, the electrode field, the magnetic field field, etc.), and refer to prior art documents as appropriate for design modification as necessary. An example thereof is the following example.

[0037] In the following examples, for example, for the same contents, the same reference numerals are cited, and detailed descriptions are appropriately omitted.

[0038] ≪Example≫ <Main configuration example of vacuum interrupter> Based on FIG. 1, a schematic configuration example of the vacuum interrupter 1A according to the embodiment will be described. In this vacuum interrupter 1A, a vacuum vessel 1 is provided, which is formed by sealing one axial side (fixed side) of an insulating cylindrical main body 10 with a fixed side flange 1a and sealing the other axial side (movable side) with a movable side flange 1b.

[0039] In the case of the cylindrical main body 10 shown in FIG. 1, a cylindrical shield (arc shield) 11 that surrounds the outer peripheral sides of the fixed electrode 2a and the movable electrode 2b described later is supported on the inner peripheral side of the cylindrical main body 10.

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

[0041] At the center of the movable side flange 1b, a flange through-hole 13 having a shape that penetrates the center in the axial direction is provided, and a columnar movable side current-carrying shaft 12b is inserted through the flange through-hole 13 and extends in the axial direction.

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

[0043] For example, a first slit-shaped gap 73 and a second slit-shaped gap 74 described later are provided in the fixed electrode 2a and the movable electrode 2b so as to have a magnetic field generation function.

[0044] According to the vacuum interrupter 1A configured as described above, while maintaining the vacuum state inside the vacuum vessel 1 (specifically, the outer peripheral side of the bellows 14 inside the vacuum vessel 1), the movable-side energizing shaft 12b (and the movable electrode 2b) can be moved in the axial direction, and the movable electrode 2b can be brought into contact with and separated from the fixed electrode 2a according to the movement of the movable-side energizing shaft 12b.

[0045] Regarding the materials, shapes, etc. of the components of the vacuum interrupter 1A, and the processing methods, assembly methods, mounting methods, etc. of these components, various modes can be appropriately applied according to the purpose of use of the vacuum interrupter 1A and the like.

[0046] For example, an insulating material (e.g., alumina ceramics) can be applied to the cylindrical main body 10 among the components of the vacuum interrupter 1A, and metal materials (e.g., stainless steel (SUS304), oxygen-free copper, titanium) can be applied to the others. However, it is preferable to appropriately select them assuming that expansion (thermal expansion) and residual stress may occur during the assembly of these components.

[0047] <Main configuration examples of the fixed electrode 2a and the movable electrode 2b> The fixed electrode 2a and the movable electrode 2b only need to be configured to have a magnetic field generation function for the purpose of easily exhibiting desired interruption performance, etc., and examples include the modes shown in FIGS. 1 to 3.

[0048] Note that the same configuration can be applied to the fixed electrode 2a and the movable electrode 2b respectively, and hereinafter, they will be collectively and simply referred to as the electrode 2 as appropriate according to the need. Also, regarding the fixed-side energizing shaft 12a and the movable-side energizing shaft 12b, hereinafter, they will be collectively and simply referred to as the energizing shaft 12 as appropriate according to the need.

[0049] The electrode 2 shown in FIGS. 1 to 3 has a cylindrical coil portion (magnetic field generating coil portion) 3 extending in the axial direction, a disc-shaped contact portion 4 provided on the opening end surface 31 on the electrode facing direction side (contact point side) of the coil portion 3, and a disc-shaped adapter portion 5 that supports the opening end surface 32 on the back side (opposite side of the electrode facing direction) of the coil portion 3 through the energization 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 and provided so as to be concentrically positioned on the inner peripheral side of the coil portion 3.

[0050] The materials, shapes, etc. of each electrode element of the electrode 2, as well as the processing methods, assembly methods, and mounting methods of each electrode element, can also be appropriately applied in various modes according to the purpose of use of the vacuum interrupter 1A, etc. For example, in the coil portion 3, the contact portion 4, and the adapter portion 5, it is preferable to apply a highly conductive metal material, and as an example, oxygen-free copper or the like can be applied. On the other hand, in the reinforcing portion 6, it is preferable to apply a metal material with high mechanical strength, and as an example, stainless steel (SUS304) can be applied.

[0051] Also, each electrode element can be assembled by appropriately using a brazing material or the like. For example, when the coil portion 3 is made of oxygen-free copper and the reinforcing portion 6 is made of stainless steel, it is possible to apply a brazing material with a melting point lower than that of the oxygen-free copper. As an example, an Ag-based (Ag-Cu-based, etc.) one can be applied.

[0052] <Configuration example of coil portion 3> The coil portion 3 includes a plurality (29 in FIG. 3) of rod-shaped pieces 7 divided in the coil circumferential direction of the coil portion 3, and adjacent ones of the rod-shaped pieces 7 in the coil circumferential direction (hereinafter, simply referred to as adjacent rod-shaped pieces 7 as appropriate) engage with each other to form a cylindrical (circular cylindrical) shape as a whole.

[0053] The rod-shaped piece 7 has a shape extending in the axial direction. Among one side end faces 71 on one side in the coil circumferential direction of the rod-shaped piece 7, a convex portion 71a protruding to one side in the coil circumferential direction is provided at the position of the central portion in the axial direction. Further, among the other side end faces 72 on the other side in the coil circumferential direction of the rod-shaped piece 7, a concave portion 72a having a shape recessed to one side in the coil circumferential direction is provided at the position of the central portion in the axial direction.

[0054] Adjacent rod-shaped pieces 7 are configured such that the convex portions 71a and the concave portions 72a facing each other are engaged (fitted) with each other. Specifically, the tip end portion 71b side in the protruding direction of the convex portion 71a on the other of the adjacent rod-shaped pieces 7 is fitted into the concave portion 72a on one of the adjacent rod-shaped pieces 7, and they are engaged with each other.

[0055] Between both of the adjacent rod-shaped pieces 7, a first slit-shaped gap 73 having a shape extending from the convex portion 71a toward the electrode facing direction side (in the figure, a shape further opening toward the electrode facing direction side) and penetrating in the coil diameter direction, and a second slit-shaped gap 74 having a shape extending from the convex portion 71a toward the opposite side of the electrode facing direction (in the figure, a shape further opening toward the opposite side) and penetrating in the coil diameter direction are formed.

[0056] The rod-shaped piece 7 may not simply have a shape extending in the axial direction, but may have a shape extending in the axial direction in a posture inclined from the axial direction toward the coil circumferential direction side (inclined along the Z winding direction in FIGS. 2 and 3), for example, as shown in FIGS. 2 and 3. The inclination angle (angle α in FIG. 2) formed by such an inclined rod-shaped piece 7 and the axial direction can be set as appropriate and is not particularly limited.

[0057] Also, in the rod-shaped piece 7 having the inclined shape as described above, by appropriately bending the rod-shaped piece 7 or the like, it may be formed into an arc shape (an arc shape convex toward the outside in the coil diameter direction) extending in the axial direction while rotating in the coil circumferential direction (extending in the Z-wound direction in FIGS. 2 and 3). The rotation angle (rotation angle θ about the axis 30 in FIG. 3) due to the rotation in the coil circumferential direction in such an arc-shaped rod-shaped piece 7 can also be appropriately set and is not particularly limited.

[0058] According to such an arc-shaped rod-shaped piece 7, even when the length of the rod-shaped piece 7 in the coil circumferential direction is designed to be large, it may be easier to form the cylindrical coil portion 3. Further, by forming the inner surface 7a and the outer surface 7b of the rod-shaped piece 7 in the coil diameter direction into a curved surface shape convex toward the outside in the coil diameter direction, it may be easier to form a more cylindrical coil portion 3.

[0059] As described above, by making the rod-shaped piece 7 into an inclined shape or an arc shape, in the first slit-shaped gap 73 and the second slit-shaped gap 74, for example, it is possible to make the slit length into a long shape (a longer shape compared to the case of a shape simply extending in the axial direction) or a rotating shape.

[0060] In the case of the coil portion 3 as shown in FIGS. 2 and 3, it has the effect of guiding the current flowing through the coil portion 3 in the coil circumferential direction, and thereby a magnetic field can be generated toward the axial direction and the outside in the coil diameter direction. Then, for example, with respect to the axial arc (flow of something having charge) in the arc that may occur when the electrode 2 is open, a force in the outside direction in the coil diameter direction or the coil circumferential direction acts, and the arc tends to become longer. As a result, the potential difference required for arc maintenance becomes high, and the growth of the arc is hindered. Therefore, as a result, it is possible to make the arc in a state where it is easy to decay.

[0061] The main current flowing through the coil portion 3 will flow through each rod-shaped piece 7. For example, the flow through the engagement portions (such as brazed portions) of both the convex portions 71a and the concave portions 72a adjacent to the rod-shaped pieces 7 is suppressed. That is, when the rod-shaped piece 7 is made of, for example, a highly conductive metal material, the main current flowing through the coil portion 3 will flow through the portion of the metal material as it is. Therefore, even when the coil portion 3 is configured by applying a plurality of rod-shaped pieces 7, it is possible to sufficiently suppress the increase in electrical resistance.

[0062] Also, compared with the conventional configuration, it is easier to form the first slit-shaped gap 73 and the second slit-shaped gap 74 having a long slit length, and it is easier to obtain high interruption performance (for example, DC interruption ability) at the electrode 2.

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

[0064] For example, it is possible to provide a concave portion (not shown) into which the end face on the electrode-facing direction side of each rod-shaped piece 7 can be fitted at the position where the end faces on the electrode-facing direction side of the respective rod-shaped pieces 7 in the contact portion 4 face each other. Thereby, the end face on the electrode-facing direction side of each rod-shaped piece 7 can be fitted into the concave portion of the contact portion 4 and assembled, and there is a possibility that it can be well supported and fixed.

[0065] Similarly, it is also possible to provide a concave portion (not shown) into which the opposite side end face can be fitted at the position where the opposite side end faces of the respective rod-shaped pieces 7 in the adapter portion 5 face each other. Thereby, the opposite side end face of each rod-shaped piece 7 can be fitted into the concave portion of the adapter portion 5 and assembled, and there is a possibility that it can be well supported and fixed.

[0066] <Configuration example of the rod-shaped piece 7> When the plurality of rod-shaped pieces 7 that constitute the coil portion 3 are arranged adjacent to each other in the circumferential direction, the adjacent rod-shaped pieces 7 can be engaged with each other by the convex portions 71a and the concave portions 72a, and the first slit-shaped gap 73 and the second slit-shaped gap 74 can be formed between the two adjacent rod-shaped pieces 7 (formed so as to obtain a magnetic field generation function). The shape of the rod-shaped piece 7, the number of pieces to be applied, the processing method, etc. can be appropriately set according to, for example, the target electrode 2. For example, the rod-shaped piece 7 may simply have a shape extending in the axial direction, or may have an inclined shape or an arc shape as shown in FIGS. 2 and 3.

[0067] The convex portion 71a may simply have a shape protruding to one side in the circumferential direction of the coil. However, for example, it may have a shape protruding in a direction inclined toward the electrode facing direction (in FIG. 2, the upper right diagonal direction as shown in the figure) like the electrode 2a in FIG. 2, or a shape protruding in a direction inclined to the opposite side of the electrode facing direction (in FIG. 2, the upper right diagonal direction as shown in the figure) like the electrode 2a in FIG. 2.

[0068] Also in the concave portion 72a, it may simply have a shape recessed to one side in the circumferential direction of the coil. However, for example, it may have a shape recessed in a direction inclined toward the electrode facing direction (in FIG. 2, the upper right diagonal direction as shown in the figure) like the electrode 2a in FIG. 2, or a shape recessed in a direction inclined to the opposite side of the electrode facing direction (in FIG. 2, the upper right diagonal direction as shown in the figure) like the electrode 2a in FIG. 2.

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

[0070] For example, as a design example when creating a plurality of rod-shaped pieces 7 as shown in FIG. 4 and forming a coil portion 3 as shown in FIG. 3 using each of the rod-shaped pieces 7, it can be designed to satisfy the following formulas (1) to (4). In the following formulas (1) to (4), Do is the outer diameter in the coil diameter direction of the coil portion 3, Di is the inner diameter in the coil diameter direction of the coil portion 3, N is the number of rod-shaped pieces 7 (the number divided in the coil circumferential direction. In FIG. 3, it is 29), s is the slit width of each of the first slit-shaped gaps 73 and the second slit-shaped gaps 74, h is the dimension in the axial direction of the coil portion 3. θ is the turning angle θ (rad) with the axis 30 shown in FIG. 3 as the axis, t’ is the dimension in the coil diameter direction shown in FIG. 3, and L’, ΔL’, d’, s’, D’ are the dimensions shown in FIG. 4, respectively.

[0071]

Number

[0072]

Number

[0073]

Number

[0074]

Number

[0075] In these formulas (1) to (4), by appropriately setting so that the turning angle θ becomes larger, it becomes possible to lengthen the rod-shaped piece 7 in the coil circumferential direction, and accordingly, the first slit-shaped gap 73 and the second slit-shaped gap 74 can also be lengthened in the circumferential direction.

[0076] <Engagement example between adjacent rod-shaped pieces 7> When adjacent rod-shaped pieces 7 are engaged with each other, in the case where the protruding direction tip 71b side of the convex portion 71a on one of the adjacent rod-shaped pieces 7 is fitted into the concave portion 72a on the other of the adjacent rod-shaped pieces 7 to be in an engaged state (hereinafter, simply referred to as the engaged state as appropriate), it is possible to brazing the convex portion 71a and the concave portion 72a using a brazing material 75 as described later.

[0077] In the case of adjacent rod-shaped pieces 7 shown in FIGS. 5 and 6, the dimension of the convex portion 71a in the axial direction is set to be smaller than the dimension of the concave portion 72a in the axial direction. That is, when the adjacent rod-shaped pieces 7 are in the engaged state, an excess space 76 is provided between the convex portion 71a and the concave portion 72a. Thereby, when making the said engaged state, it becomes possible to install the brazing material 75 in the area | region of the excess space 76 previously.

[0078] As an example of the case of brazing adjacent rod-shaped pieces 7 through the brazing material 75 installed in the excess space 76 in this way, it is possible to perform a brazing material arrangement step, an assembly step, and a melting step in this order as shown below.

[0079] First, in the brazing material arrangement step, when assembling a plurality of rod-shaped pieces 7 in a circumferential direction, the brazing material 75 is installed in advance in the region of the excess space 76 between adjacent rod-shaped pieces 7. Then, by the assembly step, the protruding direction tip 71b side of the convex portion 71a on one of the adjacent rod-shaped pieces 7 is fitted into the concave portion 72a on the other of the adjacent rod-shaped pieces 7 to be in an engaged state, whereby an assembly (for example, an assembly having the same shape as the coil portion 3 shown in FIG. 3. Hereinafter, simply referred to as the rod-shaped piece 7 assembly as appropriate) in which a plurality of rod-shaped pieces 7 are connected in the circumferential direction can be obtained.

[0080] Next, in the melting process, for example, by placing the seven-piece rod-shaped assembly in a heating furnace, the brazing material 75 is heated to a molten state. The molten brazing material 75 penetrates between both the convex portion 71a and the concave portion 72a (between each engagement surface), for example, by capillary action, and then cools and solidifies after spreading widely. As a result, both the convex portion 71a and the concave portion 72a are brazed together.

[0081] When melting the brazing material 75 in the melting process, the arrangement posture of the seven-piece rod-shaped assembly (for example, the arrangement posture in the heating furnace) is not particularly limited. However, when the vertical direction of the seven-piece rod-shaped assembly is the same as the vertical direction shown in FIGS. 5 and 6 (hereinafter, simply referred to as the illustrated vertical direction as appropriate), the molten brazing material 75 tends to flow downward as shown in FIGS. 5 and 6.

[0082] For example, in the case of the rod-shaped piece 7 shown in FIG. 5, since the concave portion 72a is recessed obliquely downward as shown, even if the seven-piece rod-shaped assembly in the melting process is in the state of the illustrated vertical direction in FIG. 5, the molten brazing material 75 tends to stay in the concave portion 72a.

[0083] On the other hand, in the case of the rod-shaped piece 7 shown in FIG. 6, a claw portion 71d that protrudes to the outer peripheral side of the convex portion 71a (protrudes upward in the illustrated vertical direction in FIG. 6) is provided at a position between the root portion 71c and the tip portion 71b in the protruding direction of the convex portion 71a. As a result, the brazing material 75 installed in the surplus space 76 is positioned between the claw portion 71d and the bottom portion 72b of the concave portion 72a. And even if the seven-piece rod-shaped assembly in the melting process is in the state of the illustrated vertical direction in FIG. 6, the molten brazing material 75 tends to stay in the concave portion 72a.

[0084] <Configuration example of electrode 2> In the case of the electrodes 2a and 2b shown in FIG. 2, each rod-shaped piece 7 extends in the same Z-winding direction with respect to the axial direction, thereby forming a so-called longitudinal magnetic field electrode configuration, but it is not limited thereto.

[0085] For example, as shown in FIG. 7, the bar-shaped piece 7 of one of the electrodes 2a and 2b (in the case of FIG. 7, the electrode 2a) may be extended in the S-winding direction with respect to the axial direction, whereby a so-called concentrated electrode configuration can be achieved.

[0086] <Configuration Examples of Contact Portion 4, Adapter Portion 5, and Reinforcing Portion 6> Similar to the coil portion 3, the contact portion 4 may be configured to obtain a desired magnetic field generation function. As a specific example, for example, as shown in Patent Documents 1 to 4, a mode in which a plurality of shape slit holes extending in the radial direction through the thickness direction (axial direction) of the contact portion 4 are formed at predetermined intervals in the circumferential direction of the contact portion 4 can be mentioned.

[0087] The adapter portion 5 may have any configuration as long as it can support the open end face 34 on the back side (the side opposite to the facing direction) of the coil portion 3 on the current-carrying shaft 12, and various modes can be applied. For example, in the case of the adapter portion 5 in the figure, the central portion of the adapter portion 5 is supported by the current-carrying shaft 12.

[0088] The reinforcing portion 6 may have any configuration as long as it can reinforce the electrode 2 by surface-bonding to the inner peripheral surface side (the surface 7a side of the bar-shaped piece 7) of the coil portion 3 on the outer peripheral surface of the peripheral wall 60, and various modes can be applied.

[0089] This reinforcing portion 6 is not an essential component of the electrode 2. For example, when the electrode 2 has a certain mechanical strength and the like and desired electrode characteristics (mechanical characteristics, electrical characteristics, etc.) can be obtained, it can be appropriately omitted.

[0090] As described above, in the present invention, only the specific examples described have been explained in detail, but it is obvious to those skilled in the art that various modifications and the like are possible within the scope of the technical idea of the present invention, and it is natural that such modifications and the like belong to the scope of the claims.

Explanation of Reference Numerals

[0091] 1A... Vacuum Interrupter 2a... Fixed Electrode, 12a... Fixed-Side Current-Carrying Shaft 2b... movable electrode, 12b... movable-side current-carrying shaft 3... coil part 4... contact part 5... adapter part 6... reinforcing part 7... rod-shaped piece, 71a... convex part, 71b... tip part in the protruding direction, 71c... base part, 71d... claw part, 72a... concave part, 72b... bottom part, 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 pair of electrodes being opposed to each other in an axial direction of the cylindrical body and being movable 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 of the coil portion on the opposing side; an adapter portion provided on the opposite side of the coil portion in the opposing direction and supported by the current-carrying shaft; having 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 of the coil portion 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 protruding 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 protrusion having a shape protruding toward the one side in the circumferential direction, a recessed portion having a recessed shape on one side in the circumferential direction is provided at a central portion in the axial direction of an end face on the other side of the circumferential direction of the rod-shaped piece, The adjacent pair of the protruding portions are engaged with each other by fitting a tip end side of the protruding portion of the other adjacent pair into the recessed portion of the adjacent pair, 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 in the opposite direction to the opposing direction and penetrating the coil portion in a radial direction; An electrode structure comprising:

2. 2. The electrode structure according to claim 1, wherein the rod-shaped piece extends in the axial direction at an angle from the axial direction to 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 rotating in the circumferential direction.

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

5. The rod-shaped piece of one of the electrodes extends in a Z-winding direction with respect 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 ones of the 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 a base portion and a tip end portion of the protrusion in the protruding direction, the claw portion protruding toward an 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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