JP2017139116A - Vacuum valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum valve which has a small size and an excellent cutoff characteristic.SOLUTION: A vacuum valve of the present invention comprises: a vacuum case; a fixed side electrode rod 4; a movable side electrode rod 5; a fixed side electrode 10 and a movable side electrode 20 which are mounted to each opposite end of the fixed side electrode rod 4 and the movable side electrode rod 5; and an arc shield 8 that is arranged to a circumference of the fixed side electrode 10 and the movable side electrode 20 in the vacuum case. The fixed side electrode 10 is formed by a fixed side contact point 11 and a fixed side coil electrode 12 formed by a fixed side ring part 13, a plurality of fixed side arm parts 14, a concentric circular fixed side coil part 15 divided by a fixed side slit part 17, and a fixed side projection part 16. The movable side electrode 20 is formed by a movable side contact point 21 and a movable side coil electrode 22 formed by a movable side ring part 23, a plurality of movable side arm parts 24, a concentric circular movable side coil 25 divided by a movable side slit side part 27, and a movable side projection part 26. The vacuum valve comprises a magnetic material 9 between an arc shield 8 corresponding to a division position of the coil electrode and the vacuum case.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vacuum valve that is used in a vacuum circuit breaker or the like and opens and closes an electric circuit, and more particularly to a vacuum valve that can efficiently diffuse an arc generated when the electric circuit is opened and closed.

  The vacuum valve is a bottomed cylindrical vacuum vessel made of an insulating material such as a glass material or a ceramic material, and the inside is evacuated to a high vacuum, electrode rods provided at both ends of the vacuum vessel, and each electrode rod Are provided with spiral coil electrodes provided at opposite ends, a support member for reinforcing the contact, and a disk-shaped contact. The fixed-side contact and the movable-side contact) are brought into contact with or separated from each other to conduct or cut off.

  Here, the coil electrode is an electrode that generates an axial magnetic field around the stationary contact and the movable contact that are the main electrodes, and a plurality of arcs along the outer peripheral edge of the contact on the back side of the contacts. The coil portion is divided and arranged. One end of the coil portion has an arm portion connected to the axis center, and the other end has a protruding portion connected to the contact.

  In a vacuum valve having a coil electrode as described above, the coil electrode generates an axial magnetic field when energized, and the arc between the contacts inevitably generated when interrupted is confined within the diameter of the contact and diffused widely on the contact surface. Let As a result, the current density can be reduced with respect to the contact surface, and the interruption capability of the contact material is superior, and the current interruption can be performed.

  Development of this coil electrode and contact material is indispensable for increasing the breaking capacity of the vacuum valve, and various studies have been conducted so far. As a result, the breaking performance of the vacuum valve is It has been found that the stronger the axial magnetic field generated, the more uniform and the larger the area, the better.

JP-A-6-150786 Japanese Patent Laid-Open No. 1-117217

  As described in Patent Documents 1 and 2, the vacuum valve that improves the breaking performance by widely diffusing the arc generated between the contacts by the magnetic field has two coils on the fixed side and the movable side. An axial magnetic field is generated between the coil electrodes through the electrodes.

  For example, as shown in Patent Document 1, the current flowing through the fixed-side electrode electrode through the fixed-side electrode rod is an arm portion connected to the fixed-side coil electrode formed in a circle from the fixed-side electrode rod, and the coil divided into an arc shape Flows through the protrusions connected from the coil part to the contact point, and flows to the fixed contact point. Furthermore, it flows from the fixed side contact to the movable side contact, and then flows to the movable side electrode rod via the projecting portion, coil portion, and arm portion of the movable side coil electrode.

  At this time, the magnetic fields generated in the coil portions are connected and arranged so that currents flow in the same direction in the coil portions on the fixed side and the movable side, thereby acting in the direction in which the magnetic fields generated from each other are strengthened. However, since the current flows in the outer peripheral direction of the arm portion of the fixed coil electrode and flows in the direction of the electrode rod in the arm portion of the movable coil electrode, the direction of each current is reversed in the arm portion. Negate each other. In addition, since the current in the circumferential direction does not flow in the protruding portions of the coil portions on the fixed side and the movable side as in the coil portion, the current flows in the axial direction of the electrode rod. Directional magnetic field does not occur.

  As described above, the magnetic field generated in both the fixed side coil part and the movable side coil part is strengthened for the coil part, and a strong magnetic field is generated in the axial direction, but the magnetic field is weakened or canceled in the projecting part and the arm part. There is no magnetic field that diffuses the arc in the axial direction, and the magnetic field around both electrodes is non-uniform.

  In order to make the magnetic field around the fixed coil electrode and the movable coil electrode uniform, a magnetic material is placed on the back of each electrode to compensate for the weak magnetic field between the electrodes. It is known that the magnetic field can be made uniform and the blocking performance is improved. However, if a magnetic material is placed inside the electrode, electromagnetic induction occurs due to the magnetic flux passing through the inside of the magnetic material. As a result, eddy current is generated and the temperature rises due to heat generation of the eddy current when the load current is applied. There is a problem that the performance is lowered.

  When the magnetic body is arranged outside the vacuum vessel of the vacuum valve, no eddy current is generated due to the shielding effect of the vacuum vessel, heat generation can be prevented, and reliability can be improved. At the same time, it is possible to increase the magnetic field in the axial direction generated between the fixed coil electrode and the movable coil electrode. However, with this arrangement, the influence of the magnetic material affects a wide range, so the weak magnetic field seen in the parts corresponding to the arms and protrusions of both electrodes is compensated to improve the non-uniformity of the magnetic field generated between the electrodes. I can't do it.

  As described above, by arranging the magnetic body, the magnetic field can be strengthened and the blocking performance can be improved, but the magnetic field cannot be made uniform. For this reason, there has been a problem that the arc cannot be sufficiently diffused and miniaturization and cost reduction of the electrode cannot be achieved.

  In addition, for example, in the example disclosed in Patent Document 2, paying attention to the fact that the terminal lead-out cover of the circuit breaker arranged in the metakura or the like has a U-shape, it extends over 3/4 of the entire circumference outside the shield. Although a magnetic material is arranged, the terminal lead bar may not always be U-shaped, for example, like a vacuum valve built in C-GIS. In such a case, the magnetic field is made uneven. It was not possible to improve the shut-off performance just by doing.

  The present invention has been made to solve such a problem, and can make the magnetic field in the axial direction uniform and intensify the magnetic field. Furthermore, it is not affected by the temperature rise due to the eddy current generated in the magnetic material. Therefore, the present invention provides a vacuum valve that is small and has excellent shut-off performance.

    A vacuum valve according to the present invention includes a vacuum vessel that covers one end of a cylindrical insulating cylinder with a fixed end plate and the other end with a movable end plate, and a fixed side fixed to the fixed end plate. An electrode rod, a movable electrode rod movably provided on the movable side end plate, a fixed electrode, a movable electrode attached to opposite ends of the fixed electrode rod and the movable electrode rod, a movable electrode, and a vacuum vessel An arc shield disposed around the fixed side electrode and the movable side electrode, the fixed side electrode and the movable side electrode, the fixed side contact, the movable side contact, the fixed side contact and the movable side facing each other When the current flows between the fixed electrode bar and the movable electrode bar, the fixed side coil electrode and the movable side coil electrode are arranged on the back surface of the contact, respectively, and the current flows in the circumferential direction perpendicular to the axis of the electrode bar. The fixed side coil electrode and the movable side coil electrode are located in the center part and fixed side Positioned in the plane perpendicular to the axis of the fixed side ring part, movable side ring part, fixed side ring part, and movable side ring part connected to the pole bar and movable side electrode bar, respectively, the fixed side slit part, the movable side A concentric fixed coil portion and a movable coil portion, which are divided into a plurality of portions in the circumferential direction by a slit portion, and a fixed ring portion extending from the fixed ring portion and the movable ring portion in a direction perpendicular to the axis, Movable from one end of the fixed side coil part, multiple fixed side arm parts that connect the movable side ring part and one end of the movable side coil part, and the other end of the fixed side coil part to the fixed side contact A vacuum valve having a fixed-side protruding portion and a movable-side protruding portion, each of which protrudes from the other end of the side coil portion to the movable-side contact and is electrically connected to each other. In response to the arc shield Between the empty container is obtained with a magnetic material.

  According to the vacuum valve of the present invention, the magnetic field in the axial direction generated by the coil portion can be generated in a uniform and wide range, and a vacuum valve excellent in blocking performance can be obtained. At the same time, since the magnetic body is not disposed inside the electrode, it is possible to avoid an increase in temperature during current application, and to obtain a vacuum valve with excellent current supply performance.

It is a longitudinal cross-sectional view of the vacuum valve which concerns on Embodiment 1 of this invention. It is a cross-sectional view of the vacuum valve according to Embodiment 1 of the present invention. It is a schematic diagram showing the magnetic field of the vacuum valve which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows the electrode structure which concerns on Embodiment 1 of this invention. It is the top view and sectional drawing of the stationary side coil electrode which concern on Embodiment 1 of this invention. It is a cross-sectional view of the vacuum valve according to Embodiment 2 of the present invention. It is a cross-sectional view of a vacuum valve according to Embodiment 3 of the present invention. It is a cross-sectional view of the vacuum valve concerning Embodiment 4 of the present invention. It is a cross-sectional view of the vacuum valve concerning Embodiment 6 of this invention. It is a transverse cross section of the vacuum valve concerning Embodiment 7 of the present invention.

  In the description of the embodiments and the respective drawings, the portions denoted by the same reference numerals indicate the same or corresponding portions.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view of a vacuum valve according to Embodiment 1 of the present invention, and FIG. 2 shows the arrangement of a magnetic material between a stationary coil electrode, a movable coil electrode, and an insulating container and an arc shield. 1 is a cross-sectional view of a vacuum valve according to Embodiment 1. FIG. FIG. 3 is a schematic diagram showing a magnetic field in the energized state of the vacuum valve according to Embodiment 1 of the present invention. FIG. 4 is an exploded perspective view showing the structure of the electrode of the present invention, and FIG. 5 is a plan view and a cross-sectional view showing the shape of the stationary coil electrode of the present invention.

  As shown in FIG. 1, a fixed side end plate 2 covers an upper end opening of the insulating cylinder 1, and a movable side end plate 3 covers a lower end opening. The insulating cylinder 1 is made of an insulating material, and alumina ceramic is used in the present embodiment. The fixed side end plate 2 and the movable side end plate 3 are joined to the end surface of the insulating cylinder 1 by brazing.

  A fixed-side electrode rod 4 is joined to the fixed-side end plate 2 by brazing, and a fixed-side electrode 10 is brazed to the fixed-side electrode rod 4. On the other hand, the movable electrode rod 5 is attached to the movable end plate 3 in a movable state, and the movable electrode 20 is joined to the movable electrode rod 5 by brazing.

  A bellows-like bellows 6 is arranged between the movable side end plate 3 and the movable side electrode rod 5 so that the movable side electrode rod 5 can operate while maintaining the vacuum inside the vacuum valve. The bellows 6 uses a thin metal plate or the like. In the present embodiment, a thin stainless steel plate is used. A bellows cover 7 is fixed to the movable electrode bar 5 by brazing at the upper end of the bellows 6.

    The fixed electrode 10 includes a fixed coil electrode 12 and a disk-shaped fixed contact 11, and the movable electrode 20 includes a movable coil electrode 22 and a movable contact 21. When the current is interrupted, an arc is generated between the stationary contact 11 of the stationary electrode 10 and the movable contact 21 of the movable electrode 20, and the inside of the insulating cylinder 1 is contaminated by metal vapor. In order to suppress the contamination by the metal vapor, the arc shield 8 is arranged so as to surround the fixed side electrode 10 and the movable side electrode 20. Further, a magnetic body 9 for uniformly diffusing the arc of the present invention is disposed on the outer surface of the arc shield 8. The material of the magnetic body 9 can be used as long as it is a normal magnetic body, and is not particularly limited. In the present embodiment, the magnetic body 9 is made using an iron-based alloy.

  Next, the structures of the fixed electrode 10 and the movable electrode 20 will be described with reference to FIGS. FIG. 2 shows a cross-sectional view of the vacuum valve as described above, and shows a state in which both the electrodes 10 and 20 are observed from the upper side (on the fixed side end plate 2 side). Therefore, the lower surface of the fixed side electrode 10, the movable side electrode 20 positioned below the fixed side electrode 10, and the like cannot be directly observed. For the parts that cannot be directly seen in this way, the numbers in the figure are parenthesized.

  FIG. 3 shows a vertical cross-sectional view of both the electrodes 10 and 20, and the state of the magnetic field generated between the fixed coil electrode 12 and the movable coil electrode 22 is schematically shown by arrows. FIG. 4 is an exploded perspective view showing the electrode structure of the present invention, showing the structure of the fixed side electrode 10 and the movable side electrode 20, and FIG. 5 explains the shape of the fixed side coil electrode 12 in detail. a) a plan view and (b) a cross-sectional view taken along line AA.

  As shown in FIGS. 2 and 3, the fixed side electrode 10 and the movable side electrode 20 are arranged with the fixed side contact 11 and the movable side contact 21 facing each other, and the fixed side coil electrode is placed on the back of each contact 11, 21. 12 and the movable coil electrode 22 are arranged. The fixed-side contact 11 is mechanically supported by the fixed-side electrode rod 4 via a fixed-side support member 18, and the movable-side contact 21 is mechanically supported by the movable-side electrode rod 5 via a movable-side support member 28. Yes. The fixed contact 11 and the movable contact 21 are preferably formed using a silver alloy or a copper alloy, and the fixed coil electrode 12 and the movable coil electrode 22 are made of copper or a copper material. Preferably formed. In the present embodiment, the fixed side contact 11, the movable side contact 21, the fixed side coil electrode 12, and the movable side coil electrode 22 are all made of copper alloy. The fixed side support member 18 and the movable side support member 28 are required to have sufficient strength, and stainless steel is used in the present embodiment.

  As shown in FIG. 2, in the present embodiment, the fixed-side slit portion 17 that is a gap between the fixed-side coil portion 15 formed in the fixed-side coil electrode 12 of the fixed-side electrode 10, and the movable-side electrode 20 is movable. The movable side slit portion 27 formed on the side coil electrode 22 was set so as to overlap when observed from the upper side of the vacuum vessel (on the fixed side end plate 2 side). The overlapping method of the fixed side electrode 10 and the movable side electrode 20 is not limited to the arrangement in which the positions of the slit portions 17 and 27 are overlapped, and the same effect can be obtained even in other overlapping methods. .

  Between the fixed side electrode 10 and the movable side electrode 20 arranged in this way, the electrodes are in contact with each other and a current flows, and as shown by arrows in FIG. 3, the fixed side electrode 4 and the movable side electrode A magnetic field is generated in a direction along the axial direction of the bar 5. This magnetic field can disperse the arc generated between the electrodes.

  The structure of the coil electrode will be described with reference to the fixed coil electrode 12 as an example in FIG. The movable coil electrode 22 is also basically the same shape as the fixed coil electrode 12. The fixed-side coil electrode 12 has a fixed-side ring portion 13 connected to the fixed-side electrode rod 4 in the central portion, and a plurality of pieces extending from the fixed-side ring portion 13 toward the outer peripheral direction at substantially equal intervals. It has the fixed side arm part 14 (three in the figure). Further, the distal end portion of the fixed side arm portion 14 is bent in the circumferential direction to form an arc-shaped fixed side coil portion 15. The fixed side coil portion 15 is formed corresponding to the fixed side arm portion 14, and has a fixed side slit portion 17 between the fixed side coil portions 15.

  A tip portion of the fixed side coil portion 15 connected to the fixed side arm portion 14 is a protruding portion for electrically connecting the fixed side coil electrode 12 and the adjacent fixed side contact 11. A fixed-side protrusion 16 is formed. The fixed-side protruding portion 16 is formed at the tip end portion of the fixed-side coil portion 15 so as to protrude by an appropriate length in the axial direction in order to be fixed to the fixed-side contact 11 by brazing.

  The fixed side coil portion 15 is arranged on a concentric circle on the outer peripheral side of the fixed side ring portion 13, and is equally divided (three divided in this embodiment) on the circumference. A magnetic field can be generated when a current flows through the stationary coil portion 15.

  The direction of the current when the fixed contact 11 and the movable contact 21 are connected and a current is passed between the fixed electrode 4 and the movable electrode 5 is indicated by an arrow in FIG. Current flows from the fixed electrode rod 4 to the movable electrode rod 5.

  The current flowing from the fixed side electrode rod 4 is shunted from the fixed side ring portion 13 of the fixed side coil electrode 12 to the fixed side arm portion 14, passes through the fixed side coil portion 15 and the fixed side protruding portion 16, and then the fixed side contact 11. To flow. Furthermore, it flows from the movable contact 21 to the movable coil electrode 22 via an arc generated between the fixed electrode 10 and the movable electrode 20, and the movable projection 26, the movable coil portion of the movable coil electrode 22. 25, merges via the movable arm 24 and flows to the movable electrode rod 5. At this time, a magnetic field is generated by the current flowing through the fixed coil electrode 12 and the movable coil electrode 22.

  In the present embodiment, as described above, the fixed-side slit portion 17 of the fixed-side coil electrode 12 and the movable-side slit portion 27 of the movable-side coil electrode 22 are arranged so as to overlap each other, as shown in FIG. The fixed side arm portion 14 of the fixed side coil electrode 12 and the movable side protruding portion 26 of the movable side coil electrode 22 overlap, and the fixed side protruding portion 16 of the fixed side coil electrode 12 and the movable side arm portion 24 of the movable side coil electrode 22 overlap. The fixed side coil part 15 of the fixed side coil electrode 12 and the movable side coil part 25 of the movable side coil electrode 22 are arranged so as to overlap each other.

  As can be seen from the direction of current shown in FIG. 4, the current flows in the same direction in the overlapping fixed coil portion 15 and movable coil portion 25, and thus a strong magnetic field in the axial direction is generated. In the portion where the fixed side arm portion 14 and the movable side protruding portion 26 and the fixed side protruding portion 16 and the movable side arm portion 24 overlap, the current of the circumferential component that generates the magnetic field in the axial direction is small, and the magnetic field is weakened as it is. .

  In the present embodiment, a magnetic body 9 is provided between the arc shield 8 and the insulating cylinder 1 as shown in FIG. The magnetic body 9 is a plate having a uniform thickness and is curved along the curved surface of the arc shield 8. A position corresponding to a portion where the current in the circumferential direction is small and a magnetic field is hardly generated in the axial direction, such as a portion where the protruding portions 16 and 26 of the fixed side electrode 10 and the movable side electrode 20 overlap with the arm portions 14 and 24. The magnetic body 9 is attached.

  In the present embodiment, the fixed side arm portion 14 of the fixed side coil electrode 12 and the movable side protruding portion 26 of the movable side coil electrode 22, and the fixed side protruding portion 16 of the fixed side coil electrode 12 and the movable side coil electrode 22 are movable. The magnetic field in the axial direction is unlikely to be generated at the portion where the side arm 24 overlaps, and the insulating cylinder 1 and the arc shield 8 on the extension line of the line connecting the regions where the magnetic field is difficult to be generated from the axial centers of the fixed side electrode 10 and the movable side electrode 20. In between, the magnetic body 9 is arrange | positioned.

  The arrangement of the magnetic body 9 can intensify the magnetic field in a portion where the magnetic field is difficult to be generated, and the magnetic field distribution in the axial direction can be made uniform. Performance is improved.

  As described above, when the positioning of the fixed side coil electrode 12 and the movable side coil electrode 22 is determined by the overlap of the fixed side slit portion 17 and the movable side slit portion 27, the width WF of the magnetic body 9 is obtained as a result of magnetic field analysis. When using WC ≦ WF ≦ (2 × WC + WS) × RF / RC using the inner radius RF of the magnetic body, the radius RC of the coil, the width WC of the coil protrusion, and the width WS of the slit as shown in FIG. That is, the ratio of the radius to the sum of the width WC of the coil projecting portion WC and the width WS of the slit portion, which is the width of the region where the magnetic field 9 becomes weaker than the width WC of the coil projecting portion WF. When the value is equal to or less than the value multiplied by, the magnetic field distribution can be made particularly uniform.

  By using the structure described in the first embodiment, the magnetic body 9 is arranged inside the electrode, and the magnetic field can be made uniform without increasing the temperature when energized. A vacuum valve can be obtained.

Embodiment 2. FIG.
FIG. 6 shows a cross-sectional view of the vacuum valve according to the present embodiment. In FIG. 6, similarly to FIG. 2, the fixed side electrode 10 and the movable side electrode 20 are observed from the upper side (the side of the fixed side end plate 2), so the lower surface of the fixed side electrode 10, the fixed side electrode 10. The movable electrode 20 and the like located on the lower side cannot be directly observed. For the parts that cannot be directly seen in this way, the numbers in the figure are parenthesized.

  The basic configuration of the vacuum valve according to the present embodiment is the same as that of the vacuum valve according to the first embodiment. In the vacuum valve according to the first embodiment, the fixed coil electrode 12 and the movable coil electrode 22 are respectively Whereas the fixed side slit portion 17 and the movable side slit portion 27 are arranged so as to overlap with each other, the fixed side coil portion 15 and the movable side coil portion 25 are arranged so as to overlap each other. The coil part 15 and the movable side coil part 25 are divided into four parts, and are different in that they are arranged so that the positions of the fixed side protruding part 16 and the movable side protruding part 26 overlap.

  Even when the fixed-side coil electrode 12 and the movable-side coil electrode 22 are aligned so that their protruding portions overlap each other, the fixed-side electrode 10, When a current flows between the movable side electrodes 20, a current flows in the same circumferential direction, so that a strong magnetic field can be generated in the axial direction, but a portion where the fixed side protruding portion 16 and the movable side protruding portion 26 overlap. In the vicinity, the current in the circumferential direction is small and the generated magnetic field is weak.

  A magnetic body 9 is disposed on an extension line connecting a portion where the fixed side protrusion 16 and the movable side protrusion 26 overlap from the axial center of the electrode and between the insulating cylinder 1 and the arc shield 8. The magnetic body 9 is a plate having a uniform thickness as in the first embodiment, and is curved along the curved surface of the arc shield 8. In this embodiment, an iron cobalt alloy is used. By arranging the magnetic body 9, the magnetic field in the vicinity of the portion where the fixed protrusion 16 and the movable protrusion 26 overlap is strengthened, the magnetic field distribution can be made uniform, and the area where the arc is diffused when the current is interrupted is enlarged. Therefore, the blocking characteristic can be improved.

  When the fixed-side electrode 10 and the movable-side electrode 20 are arranged so that the fixed-side protruding portion 16 and the movable-side protruding portion 26 overlap, the width WF of the magnetic body 9 is such that the inner radius of the magnetic body 9 is RF and the protruding portion When the width is WC, the arm width is WA, the slit width is WS, and the coil radius is RC, when WC ≦ WF ≦ (2 × WA + WC + 2 × WS) × RF / RC, that is, the magnetic body 9 The width WF is equal to or larger than the width WC of the coil protrusion, and the width of the region where the magnetic field is weakened. The sum of the width WA of the arm, the width WC of the coil protrusion, and the width WS of the slit It was found from the magnetic field analysis that the magnetic field distribution can be made particularly uniform when the value is not more than the value obtained by multiplying the ratio by the radius ratio.

  In the structure of the vacuum valve shown in the present embodiment, since the magnetic body 9 is not arranged inside the electrode, the magnetic field can be made uniform without being adversely affected by the temperature rise at the time of energizing the current, and it is small in size and has a blocking performance. An excellent vacuum valve can be obtained.

Embodiment 3 FIG.
FIG. 7 shows a cross-sectional view of the vacuum valve according to the present embodiment. In FIG. 7, similarly to FIG. 2, the fixed side electrode 10 and the movable side electrode 20 are observed from the upper side (the side of the fixed side end plate 2), so the lower surface of the fixed side electrode 10, the fixed side electrode 10. The movable electrode 20 and the like located on the lower side cannot be directly observed. For the parts that cannot be directly seen in this way, the numbers in the figure are parenthesized.

  The basic configuration of the vacuum valve according to the present embodiment is the same as that of the vacuum valve described in the first embodiment, and the fixed side coil portion 15 constituting the fixed side electrode 10 and the movable side constituting the movable side electrode 20. Each of the coil portions 25 is divided into three parts and arranged so as to overlap each other. In the present embodiment, the configuration of the three magnetic bodies arranged between the insulating cylinder 1 and the arc shield 8 is different correspondingly.

  In the present embodiment and the following embodiments, the configuration and arrangement of the fixed-side electrode 10 and the movable-side electrode 20 are basically the same as those in the first embodiment. However, the present invention is not limited to this. As shown in the second embodiment, the shape and arrangement of the fixed side electrode 10 and the movable side electrode 20 can be configured such that the coil parts 15 and 25 are divided into four parts and the protruding parts 16 and 26 overlap each other. Other configurations can also be used. However, when the shape and arrangement of the fixed side electrode 10 and the movable side electrode 20 are changed, it is necessary to change other configurations such as the magnetic body 9 at the same time.

  In the first embodiment, the magnetic body 9 is made of an iron-based alloy, is a plate having a uniform thickness, and has a shape curved along the shape of the arc shield 8. In the present embodiment, the magnetic body 9c is composed of two kinds of magnetic materials, and the magnetic body materials constituting the magnetic body 9a located at both ends in the circumferential direction and the magnetic body 9b located in the central portion are different. ing. Specifically, the magnetic bodies 9a at both ends in the circumferential direction of the magnetic body 9c are made of iron, and the magnetic body 9b at the center is formed of an iron cobalt alloy having a higher magnetic permeability than pure iron.

  In the present embodiment, the positional relationship between the fixed side electrode 10 and the movable side electrode 20 is the same as that in the first embodiment, and the slit portions 17 and 27 are arranged so as to coincide with each other. At this time, the arm portion 14 of the fixed coil electrode 12 and the protruding portion 26 of the movable coil electrode 22 overlap, and the protruding portion 16 of the fixed coil electrode 12 and the arm 24 of the movable coil electrode 22 overlap. In these portions, the current in the circumferential direction is small, and the generated magnetic field is also weakened.

  When this low magnetic field part is examined in detail, the magnetic field is the weakest at the central part and slightly strong at the peripheral part. The magnetic body 9c used in the present embodiment uses a magnetic material with low magnetic permeability at both ends and a magnetic material with high magnetic permeability at the center portion. The effect of strengthening the magnetic field greatly and the magnetic field in the surrounding area where the magnetic field is slightly low is relatively small, the distribution of the magnetic field can be made more uniform, and a small vacuum valve with excellent blocking characteristics can be obtained. it can.

  In the present embodiment, the magnetic body 9a at both ends has a width of 1/4 of the entire magnetic body 9c, and the magnetic body 9b at the center portion has a width of 1/2 of the entire magnetic body 9c. Although it divided | segmented, it is not limited to this, A division | segmentation ratio can be set freely. However, it is important to use a magnetic body having a low permeability at both ends and a magnetic body having a high permeability at the center.

  In the structure of the vacuum valve shown in the present embodiment, since the magnetic body 9 is not disposed inside the electrode, there is no decrease in reliability due to a temperature rise during current application, the magnetic field can be made uniform, and the shut-off performance is small. An excellent vacuum valve can be obtained.

Embodiment 4 FIG.
FIG. 8 shows a cross-sectional view of the vacuum valve according to the present embodiment. In FIG. 8, similarly to FIG. 2, the fixed-side electrode 10 and the movable-side electrode 20 are observed from the upper side (the fixed-side end plate 2 side). The movable electrode 20 and the like located on the lower side cannot be directly observed. For the parts that cannot be directly seen in this way, the numbers in the figure are parenthesized.

  The basic configuration of the vacuum valve according to the present embodiment is the same as that of the vacuum valve described in the first embodiment, and the fixed side coil portion 15 constituting the fixed side electrode 10 and the movable side constituting the movable side electrode 20. Each of the coil portions 25 is divided into three. These configurations are examples as described above, and other configurations can be used.

  In the present embodiment, the shapes of the three magnetic bodies arranged between the insulating cylinder 1 and the arc shield 8 are different. In the first embodiment, a plate-like iron-based alloy having an equal thickness is used, and the magnetic body 9 having a curved shape according to the shape of the arc shield 8 is used. This embodiment is the same as Embodiment 1 in that an iron-based alloy is used and a magnetic body 9d curved according to the shape of the arc shield 8 is used, but the thickness of the magnetic body 9d is not uniform. The difference is that both ends in the circumferential direction are thin and the central part is thick.

  The portion where the magnetic field generated when the current is applied between the electrodes is weakened has the weakest magnetic field at the central portion, and is slightly stronger around the central portion. On the other hand, the shape of the magnetic body 9d is thick at the center and thin at both ends in the circumferential direction. The thinner part is more likely to cause magnetic saturation and the effect of strengthening the magnetic field is less. Therefore, the magnetic body 9d corresponding to the central part where the magnetic field is weakest is thicker and the effect of strengthening the magnetic field is larger. Since the effect of thinly strengthening the magnetic field is weakened, the magnetic field distribution when the magnetic body 9 is not used can be compensated, the magnetic field distribution can be made more uniform, and a small vacuum valve with excellent blocking characteristics can be obtained.

  In the structure of the vacuum valve shown in the present embodiment, since the magnetic body 9 is not arranged inside the electrode, the magnetic field can be made uniform without being adversely affected by the temperature rise at the time of energizing the current, and it is small in size and has a blocking performance. An excellent vacuum valve can be obtained.

Embodiment 5. FIG.
FIG. 9 shows a cross-sectional view of the vacuum valve according to the present embodiment. In FIG. 9 as well, the numbers in the figure are parenthesized for portions that are observed from the upper side (fixed side end plate 2 side) as in FIG.

  The basic configuration of the vacuum valve according to the present embodiment is the same as that of the vacuum valve described in the first embodiment, and the stationary coil 15 that constitutes the stationary electrode 10 and the movable coil that constitutes the movable electrode 20. The part 25 is divided into three locations. These arrangements are examples, and configurations different from these can also be used.

  The present embodiment is different in that each magnetic body 9h has a rod shape extending in the vertical direction (axial direction). In the first embodiment, the magnetic body 9 uses an iron-based alloy, is a plate having a uniform thickness, and is curved along the shape of the arc shield 8. In the present embodiment, the magnetic body 9h is divided into five rod-shaped members extending in the vertical direction (axial direction), two magnetic bodies 9g at both ends, two magnetic bodies 9f at an intermediate position, and one central portion. It consists of two magnetic bodies 9e.

  The cross-sectional area of the five magnetic bodies 9h is such that the surrounding magnetic body 9g <the intermediate position magnetic body 9h <the central portion magnetic body 9e, and the mounting interval of each magnetic body is also directed from the central portion toward both ends. It is configured to be wide. With such a configuration of the magnetic body 9h, when viewed in the left-right direction (circumferential direction), the magnetic body 9 has a larger cross-sectional area at the center than at both ends, and the center at the center rather than at both ends. Great effect of strengthening magnetic field.

  In the present embodiment, the positional relationship between the fixed side electrode 10 and the movable side electrode 20 is the same as that in the first embodiment, and the slit portions 17 and 27 are arranged so as to coincide with each other. In the portion centered on the slit portions 17 and 27, the current in the circumferential direction is small, and the generated magnetic field is also weakened. More specifically, the magnetic field is weakest at the center and slightly stronger at both ends.

  If the magnetic material 9h divided into five parts used in the present embodiment is used in the part where the magnetic field is weakened, the effect of strengthening the magnetic field is large at the central part and the effect of strengthening the magnetic field is small at both ends. It is possible to obtain a vacuum valve that can be made uniform and has a small size and excellent blocking characteristics.

  In the present embodiment, the magnetic body 9h is divided into five parts, and the magnetic body in both end directions (circumferential direction) is thinner and wider in the installation interval. However, the width and installation interval of the magnetic body are not particularly limited, What is necessary is just to make it the cross-sectional area of a magnetic body be large in the center part, and may become narrow in the part of both ends.

    In the vacuum valve structure shown in the present embodiment, since no magnetic material is disposed inside the electrode, the magnetic field can be made uniform without being adversely affected by the temperature rise during current application, and it is small and has excellent blocking performance. A vacuum valve can be obtained.

Embodiment 7 FIG.
FIG. 10 shows a cross-sectional view of the vacuum valve according to this embodiment. In FIG. 10 as well, the numbers in the figure are parenthesized for portions that are observed from the upper side (the fixed side end plate 2 side) as in FIG.

  The basic configuration of the vacuum valve according to the present embodiment is the same as that of the vacuum valve described in the first embodiment, and the fixed coil 15 that constitutes the fixed electrode 10 and the movable coil that constitutes the movable electrode 20. Each of the portions 25 is divided into three parts and arranged in an overlapping manner. As described above, this configuration is an example, and different configurations can be used.

  For example, in the first embodiment, the magnetic body is disposed at a position corresponding to a portion where the magnetic field generated by the fixed side electrode 10 and the movable side electrode 20 becomes weak. Specifically, in the first embodiment, the fixed-side slit portion 17 of the fixed-side electrode 10 and the movable-side slit portion 27 of the movable-side electrode 20 are arranged so as to overlap each other, and the magnetic field becomes weak in the vicinity of this portion. . Therefore, the magnetic body 9 is arranged at a position corresponding to this portion.

  In the present embodiment, the arc shield 8 itself is formed of a magnetic material to form a magnetic body (also as an arc shield) 9i, and the portion where the magnetic body 9 is disposed in the first embodiment, that is, the fixed electrode 10 In the portion where the magnetic field generated by the movable side electrode 20 is weak, the thickness of the magnetic body 9i is increased to form the magnetic body (thick portion) 9k.

  In the present embodiment, the magnetic body (also serving as an arc shield) 9m is formed using an iron-based alloy including the magnetic body (thick portion) 9k. The thin part of the magnetic body (also known as arc shield) 9m is made of the same material as the magnetic body (thick part) 9k, so the magnetic permeability is basically the same and the effect of strengthening the magnetic field is the same. Compared to the thin portion, the magnetic body (thick portion) 9k is less likely to cause magnetic saturation as described in the fourth embodiment, and has a great effect of increasing the electric field. Therefore, the distribution of the magnetic field can be made uniform, and a small vacuum valve having excellent blocking characteristics can be obtained.

  In the vacuum valve structure shown in the present embodiment, since no magnetic material is disposed inside the electrode, the magnetic field can be made uniform without being adversely affected by the temperature rise during current application, and it is small and has excellent blocking performance. A vacuum valve can be obtained.

DESCRIPTION OF SYMBOLS 1 Insulating cylinder, 2 Fixed side end plate, 3 Movable side end plate, 4 Fixed side electrode rod, 5 Movable side electrode rod, 6 Bellows, 7 Bellows cover, 8 Arc shield, 9 Magnetic body, 9a, b, c, d , E, f, g, h, i, j, k, m Magnetic body, 10 fixed side electrode, 11 fixed side contact, 12 fixed side coil electrode, 13 fixed side ring part, 14 fixed side arm part, 15 fixed side Coil part, 16 Fixed side protrusion, 17 Fixed side slit part, 18 Fixed side support material, 20 Movable side electrode, 21 Movable side contact, 22 Movable side coil electrode, 23 Movable side ring part, 24 Movable side arm part, 25 Movable side coil part, 26 Movable side protrusion part, 27 Movable side slit part, 28 Movable side support material, RF magnetic body radius, WF magnetic body width, RC coil radius, WC projecting part width, WA arm part width. WS Slit width.

Claims (12)

A vacuum vessel covering one end of a cylindrical insulating cylinder with a fixed side end plate and the other end with a movable side end plate;
A fixed-side electrode rod fixed to the fixed-side end plate;
A movable-side electrode rod provided on the movable-side end plate so as to be movable back and forth;
A stationary electrode, a movable electrode, and a stationary electrode attached to opposite ends of the stationary electrode rod and the movable electrode rod,
An arc shield disposed around the fixed side electrode and the movable side electrode inside the vacuum vessel, and
The fixed-side electrode and the movable-side electrode are a fixed-side contact and a movable-side contact facing each other,
When the current flows between the fixed-side electrode rod and the movable-side electrode rod, the current flows in the circumferential direction perpendicular to the axis of the electrode rod. Each has a fixed coil electrode and a movable coil electrode,
The fixed coil electrode and the movable coil electrode are
A fixed-side ring portion that is located in a central portion and is connected to the movable-side electrode rod, and a movable-side ring portion;
A concentric fixed side coil portion that is located in a plane orthogonal to the axis of the fixed side ring portion and the movable side ring portion and is divided into a plurality of portions in the circumferential direction by the fixed side slit portion and the movable side slit portion, respectively. A movable coil portion;
The fixed side ring part, extending from the movable side ring part in a direction perpendicular to the axis line, the fixed side ring part and one end of the fixed side coil part, the movable side ring part and one end of the movable side coil part A plurality of fixed-side arm portions, movable-side arm portions each connected,
A fixed-side protruding portion, a movable-side protruding portion that protrudes from the other end of the fixed-side coil portion to the fixed-side contact, and protrudes from the other end of the movable-side coil portion to the movable-side contact;
A vacuum valve having
A vacuum valve comprising a magnetic material between the arc shield and the vacuum vessel, corresponding to the division position of the fixed coil electrode and the movable coil electrode.   2. The vacuum valve according to claim 1, wherein the number of divisions of the stationary coil electrode and the movable coil electrode is the same as the number of the magnetic bodies. The fixed side electrode and the movable side electrode are arranged so as to overlap with the position of the fixed side slit portion and the position of the movable side slit portion, respectively.
The vacuum valve according to claim 1 or 2, wherein the magnetic body is arranged on an extension line of a line connecting the axis and the slit portions. When the width of the magnetic body is WF, the distance of the magnetic body from the axis is RF, the width of the protrusion is WC, the width of the slit is WS, and the inner radius of the coil electrode is RC, the width WF of the magnetic body Is
WC ≦ WF ≦ (2 × WC + WS) × RF / RC
The vacuum valve according to claim 3, wherein: The fixed side electrode and the movable side electrode are arranged so as to overlap with the position of the fixed side protruding portion and the position of the movable side protruding portion, respectively.
3. The vacuum valve according to claim 1, wherein the magnetic body is disposed on an extension of a line connecting the axis and the protrusions. When the width of the magnetic material is WF, the distance of the magnetic material from the axis is RF, the width of the protrusion is WC, the width of the arm is WA, the width of the slit is WS, and the inner radius of the coil electrode is RC The width WF of the magnetic material is
WC ≦ WF ≦ (2 × WA + WC + 2 × WS) × RF / RC
The vacuum valve according to claim 5, wherein:   The said magnetic body is comprised from the some area | region formed in the circumferential direction orthogonal to the said axis line, and each said area | region consists of 2 or more types of area | regions from which a magnetic material differs. The vacuum valve according to any one of the above.   The said magnetic body is comprised from the several area | region formed in the circumferential direction orthogonal to the said axis line, and it is formed with the magnetic body material with a high magnetic permeability in the area | region of both ends. Vacuum valve.   The thickness of the said magnetic body is changing in the circumferential direction orthogonal to the said axis, It is formed so that the area | region of both ends is thin and it is thick at the center, It is any one of Claims 1-6 characterized by the above-mentioned. Vacuum valve.   The magnetic body is divided into a plurality of regions in a circumferential direction orthogonal to the axis, and the cross-sectional area of the magnetic body is made smaller at both ends so as to leave a gap. The vacuum valve according to any one of the above.   The vacuum valve according to claim 1, wherein the magnetic body and the arc shield are integrally formed of the same material.   The magnetic body and the arc shield are integrally formed of the same material, and the magnetic body has a thickness that changes in the circumferential direction perpendicular to the axis, and is thinner at both end regions and thicker at the central portion. The vacuum valve according to claim 11, which is characterized by:

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