JP2018092817A - Vacuum valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum valve which improves a cutoff performance of an arc generated between a pair of contact parts by substantially uniformly distributing a longitudinal magnetic field generated in a longitudinal magnetic field electrode from the center of a contact to the outside.SOLUTION: The present invention relates to a vacuum valve in which a pair of contact parts 6 and 7 that are freely contacted/separated is disposed within a vacuum container. The contact part includes: an electrification shaft 8; a longitudinal magnetic field electrode 10 which is fixed to one end of the electrification shaft and generates a longitudinal magnetic field in parallel with an axial direction; a circular contact plate 11 which is fixed while closing an opening in one end of a cylindrical part 16 constituting the longitudinal magnetic field electrode in the axial direction; and a magnetic substance 15 which is disposed in an internal space 13 enclosed by the cylindrical part and the contact plate. The magnetic substance has a hat shape including an annular recess 20 and an annular flange 21 extending radially outwards from an opening edge of an outer peripheral wall of the annular recess. The opening of the annular recess faces a central side of a rear surface of the contact plate, and the annular flange faces an outer peripheral side of the rear surface of the contact plate.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vacuum valve that generates a longitudinal magnetic field between a pair of contact portions that can be separated from each other.

For example, a pair of contact portions that can be contacted and separated from the vacuum valve of Patent Document 1 includes an electrode that is fixed to one end of a current-carrying shaft and generates a magnetic field, and a contact plate that is fixed to one end in the axial direction of the electrode. I have.
This patent document 1 employs a longitudinal magnetic field electrode for diffusing the arc by generating a longitudinal magnetic field parallel to the axial direction of the contact plate in order to prevent stagnation of the arc generated between the contacts. By arranging the magnetic body on the inner side, the longitudinal magnetic field is uniformly distributed from the center of the contact plate to the outer peripheral side.

1 to 3 of JP 2011-228083 A

In Patent Document 1, the end surface in the axial direction of a cylindrical magnetic body is arranged on the outer peripheral side of the back surface of the contact plate, and the longitudinal magnetic field of the longitudinal magnetic field electrode generated strongly at the center of the contact plate is the magnetic body. The magnetic force of the contact plate attracts the contact plate toward the outer periphery.
However, the longitudinal magnetic field is not uniformly distributed from the center to the outside of the contact plate only by arranging the cylindrical magnetic body on the outer peripheral side of the contact plate, and it is necessary to improve the distribution of the longitudinal magnetic field.
Therefore, the present invention can improve the interruption performance of the arc generated between the pair of contact portions by distributing the vertical magnetic field generated by the vertical magnetic field electrode substantially uniformly from the center to the outside of the contact plate. It aims to provide a vacuum valve.

  In order to achieve the above object, a vacuum valve according to an aspect of the present invention has a pair of contact portions that can be contacted and separated in a vacuum vessel, and the pair of contact portions are energized through the vacuum vessel. A longitudinal magnetic field electrode that generates a longitudinal magnetic field parallel to the axial direction between a pair of contact portions and is fixed to one end of a shaft and a current-carrying shaft in the vacuum vessel, and an opening at one axial end of a cylindrical portion that constitutes the longitudinal magnetic field electrode A circular contact plate that is closed and fixed, and a magnetic body disposed in an internal space surrounded by the cylindrical portion and the contact plate, the magnetic body including an annular recess and an outer periphery of the annular recess It has a hat shape with an annular collar extending radially outward from the opening edge of the wall, the opening of the annular recess faces the center side of the back surface of the contact plate, and the annular collar is the contact A magnetic body is disposed in the internal space in a state of facing the outer peripheral side of the back surface of the plate.

  According to the vacuum valve according to the present invention, the distribution of the longitudinal magnetic field generated by the longitudinal magnetic field electrode is substantially uniformly distributed from the center to the outside of the contact plate, thereby improving the interruption performance of the arc generated between the pair of contact portions. Can be made.

It is a figure which shows the structure of a vacuum valve. It is a figure which shows the structure of the contact part of 1st Embodiment which concerns on this invention. It is a perspective view which shows the structure of the longitudinal magnetic field electrode which comprises the contact part of 1st Embodiment which concerns on this invention. It is the figure which showed the magnetic body which comprises the contact part of 1st Embodiment which concerns on this invention by planar view. It is a figure which shows distribution of the longitudinal magnetic field which generate | occur | produces in the arc between a pair of contact parts of 1st Embodiment which concerns on this invention. It is the figure which showed the magnetic body which comprises the contact part of 2nd Embodiment which concerns on this invention by planar view. It is a figure which shows the structure of the contact part of 3rd Embodiment which concerns on this invention.

Next, a first embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.
The first embodiment described below exemplifies an apparatus and method for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, and structure of component parts. The arrangement is not specified below. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

[Vacuum valve of the first embodiment]
FIG. 1 shows an outline of the vacuum valve 1.
In the vacuum valve 1, a fixed-side sealing fitting 3 is sealed at one end of a cylindrical vacuum insulating container 2, and a movable-side sealing fitting 4 is sealed at the other end. A fixed-side energizing shaft 5 is passed through and fixed to the fixed-side sealing fitting 3, and a fixed-side contact portion 6 is provided at the end of the fixed-side energizing shaft 5 in the vacuum insulating container 2.
In addition, the movable side contact portion 7 that is detachable so as to face the fixed side contact portion 6 is provided at the end of the movable side energizing shaft 8 that movably penetrates the movable side sealing bracket 4.

  As shown in FIG. 2, the movable contact 7 is fixed by closing the cup-shaped electrode 10 fixed to the end of the movable conductive shaft 8 in the vacuum insulating container 2 and the opening of the electrode 10. The contact plate 11, the contact 12 fixed to the surface of the contact plate 11, the reinforcing member 14 disposed in the internal space 13 surrounded by the electrode 10 and the contact plate 11, and the back surface of the contact plate 11. And a magnetic body 15 disposed in the internal space 13 in a state.

As shown in FIG. 3, the electrode 10 is a member provided with a cylindrical portion 16 and a bottom portion 17 formed at one end of the cylindrical portion 16 in the axial direction. The cylindrical portion 16 is inclined with respect to the axial direction. A plurality of electrode slits 18 are formed across.
As shown in FIG. 2, the reinforcing member 14 is a member made of a non-magnetic material, and includes a reduced diameter shaft portion 14a, and enlarged diameter contact portions 14b and 14c fixed coaxially to both ends of the reduced diameter shaft portion 14a. The diameter expansion contact portions 14b and 14c are disposed in contact with the bottom portion of the electrode 10 and the center portion of the back surface of the contact plate 11, and the fixed contact portion 6 and the movable contact portion 7 are in contact with each other. The deformation of the contact plate 11 is prevented. The reinforcing member 14 is made of stainless steel, for example.

As shown in FIGS. 2 and 4, the magnetic body 15 includes an annular recess 20 and an annular collar portion 21 extending radially outward from the opening edge of the outer peripheral wall 20 a of the annular recess 20. A hat-shaped member provided.
As shown in FIG. 2, the magnetic body 15 has an opening of the annular recess 20 facing the inside of the back surface of the contact plate 11 and an annular collar portion 21 facing the outside of the back surface of the contact plate 11. The inner periphery of the annular recess 20 is fixed to the outer periphery of the enlarged diameter contact portion 14 b of the reinforcing member 14, and the outer periphery of the annular collar portion 21 is disposed in the inner space 13 with the outer periphery fixed to the inner peripheral surface of the cylindrical portion 16. Has been.
In addition, the fixed-side contact portion 6 provided at the end portion of the fixed-side energizing shaft 5 has the same structure as the movable-side contact portion 7.
The longitudinal magnetic field electrode according to the present invention corresponds to the electrode 10.

[Operation of the vacuum valve according to the first embodiment when an arc is generated]
Next, the operation when an arc is generated at the center of the contact 12 of the fixed contact 6 and the movable contact 7 will be described.
When an arc is generated at the center of the contact 12 of the stationary contact portion 6 and the movable contact portion 7, the cylindrical portion 16 of the cup-shaped electrode 10 is provided with a plurality of electrode slits 18 that obliquely cross the axial direction. Thus, when a current in the circumferential direction flows through the cylindrical portion 16, a magnetic field (longitudinal magnetic field) parallel to the arc is applied between the contact 12 of the fixed contact portion 6 and the movable contact portion 7.

In this way, when a longitudinal magnetic field is applied to the arc, the arc is diffused and stabilized, and the arc voltage between the contacts 12 of the fixed side contact portion 6 and the movable side contact portion 7 is reduced.
And the magnetic body 15 arrange | positioned on the back surface of the contact plate 11 of the fixed side contact part 6 and the movable side contact part 7 equalizes a vertical magnetic field distribution from the center of the contact 12 to the outer side.
That is, the opening of the annular recess 20 of the magnetic body 15 faces the inside of the back surface of the contact plate 11 and the annular collar portion 21 of the magnetic body 15 faces the outside of the back surface of the contact plate 11. Thus, a strong magnetic field generated in the annular collar portion 21 and a relatively weak magnetic force generated in the annular recess portion 20 form a strong magnetic field in a wide range of the longitudinal magnetic field generated in the central portion of the contact 12.

  The longitudinal magnetic field generated in the central portion of the contact 12 by the magnetic force generated by the annular collar portion 21 and the annular concave portion 20 of the magnetic body 15 as shown by the solid line in FIG. A longitudinal magnetic field distribution having a strong magnetic field strength in a wide range from the outside to the outside (a longitudinal magnetic field distribution in a range M1 in FIG. 5). On the other hand, the conventional contact in which the magnetic substance shown by the broken line in FIG. 5 is not arranged has a vertical magnetic field distribution with a strong magnetic field strength in a narrow range from the center of the contact to the outside (the vertical field in the range of M2 in FIG. 5). Magnetic field distribution).

[Effect of the first embodiment]
In the vacuum valve 1 according to the first embodiment, the magnetic body 15 having the annular collar portion 21 and the annular recess portion 20 has a magnetic field strength in a wide range from the center to the outside of the contact 12 with respect to the vertical magnetic field distribution generated in the electrode 10. Has a strong distribution. For this reason, the arc generated at the center of the contact 12 of the fixed contact portion 6 and the movable contact portion 7 is reduced in arc voltage due to the generation of the longitudinal magnetic field and diffused throughout the contact 12. , The blocking performance can be improved.

Further, even if the magnetic body 15 is not made of a high permeability magnetic material such as pure iron, the contact 12 can be formed only by a simple hat-shaped shape including the annular recess 20 and the annular collar portion 21. Since the longitudinal magnetic field distribution with a strong magnetic field intensity can be obtained in a wide range from the center to the outside, the material cost and processing cost of the magnetic body 15 can be reduced.
Further, in accordance with the strength of the longitudinal magnetic field generated in the electrode 10, the radial dimension of the annular recess 20 and the annular collar 21 constituting the magnetic body 15, the axial dimension of the annular recess 20, or the circle By appropriately changing the thickness dimensions and the like of the annular recess 20 and the annular collar portion 21, it is possible to easily and effectively control the uniform distribution of the longitudinal magnetic field across the contact 12.

[Magnetic Material of Second Embodiment]
Next, what is shown in FIG. 6 is the magnetic body 25 of the second embodiment used in the vacuum valve 1. In addition, the same code | symbol is attached | subjected to the same component as what was shown in FIGS. 1-5, and the description is abbreviate | omitted.
The magnetic body 25 of the second embodiment has a hat shape including an annular recess 26 and an annular collar portion 27 extending radially outward from the opening edge of the outer peripheral wall 26a of the annular recess 26. In addition, a plurality of magnetic slits 28 extending radially to the outer peripheral edge of the bottom wall 26b, the outer peripheral wall 26a, and the annular collar portion 27 of the annular recess 26 are formed.
Then, the magnetic body 25 is arranged in a state where the opening of the annular recess 26 is opposed to the inside of the back surface of the contact plate 11 shown in FIG. 2 and the annular collar portion 27 is opposed to the outside of the back surface of the contact plate 11. Then, in the magnetic body 25, the eddy current generated in the AC magnetic field is suppressed by the plurality of radially formed magnetic slits 28, so that no shunting occurs.

[Effects of Second Embodiment]
When the magnetic body 25 of the second embodiment is used for a vacuum valve, the longitudinal magnetic field strength is increased by the magnetic body 25 that suppresses the eddy current generated in the alternating magnetic field by the plurality of radially formed magnetic slits 28, and the longitudinal magnetic field. The distribution can be improved and the blocking characteristics can be further improved.

[Contact part of the third embodiment]
Next, FIG. 7 shows the movable side contact part 30 of 3rd Embodiment. In addition, the same code | symbol is attached | subjected to the same component as the structure shown in FIGS. 1-6, and the description is abbreviate | omitted.
The movable contact portion 30 is in the state of being close to the electrode 10, the contact plate 11, the contact 12, and the back surface of the contact plate 11 that are fixed to the end of the movable conduction shaft 31 in the vacuum insulating container 2. And a magnetic body 15 disposed in the space 13.
In 3rd Embodiment, the reinforcement member 14 comprised with the movable side contact part 7 of 1st Embodiment does not exist.

The movable energizing shaft 31 of the third embodiment includes a reinforcing shaft 32 made of a nonmagnetic metal and a conductive energizing tube 33 attached to the outer periphery of the reinforcing shaft 32. The reinforcing shaft 32 is made of, for example, stainless steel, and the conducting tube 33 is made of, for example, copper.
The reinforcing shaft 32 is fixed in a state where it penetrates the bottom portion 17 of the electrode 10 and is in contact with the back surface of the contact plate 11. The current-carrying tube 33 is fixed in contact with the bottom 17 of the electrode.
A fixed-side contact portion (not shown) provided at the end of the fixed-side energizing shaft 5 has the same structure as the movable-side contact portion 30.

[Effect of the third embodiment]
The movable side contact portion 30 (and the fixed side contact portion) of the third embodiment does not use the reinforcing member 14 used in the first embodiment, and the reinforcing shaft 32 constituting the movable side energizing shaft 31 is a contact plate. 11 is in contact with the back surface. The contact plate 11 receives an impact when the movable contact portion 30 and the fixed contact portion come into contact with each other, but by providing the reinforcing shaft 32 in contact with the back surface of the contact plate 11, the contact plate 11 is prevented from being deformed. The strength of the contact plate 11 can be ensured.
In addition, the number of parts can be reduced by abutting the reinforcing shaft 32 constituting the movable side energizing shaft 31 without using the reinforcing member 14 against the back surface of the contact plate 11, and the outer periphery of the reinforcing shaft 32 can be energized. By mounting the tube 33, the conductive material of the current tube 33 can be reduced, so that the manufacturing cost of the vacuum valve can be reduced.

DESCRIPTION OF SYMBOLS 1 Vacuum valve 2 Vacuum insulation container 3 Fixed side sealing metal fitting 4 Movable side sealing metal fitting 5 Fixed side energization shaft 6 Fixed side contact part 7 Movable side contact part 8 Movable side energization axis 10 Electrode 11 Contact plate 12 Contact 13 Internal space 14 Reinforcing member 14a Diameter reduction shaft portions 14b, 14c Diameter expansion contact portion 15 Magnetic body 16 Cylindrical portion 17 Bottom 18 Electrode slit 20 Annular recess 20a Outer peripheral wall 21 Annular collar 25 Magnetic body 26 Annular recess 26a Outer peripheral wall 26b Bottom Wall 27 Toroidal collar portion 28 Magnetic slit 30 Movable side contact portion 31 Movable side energizing shaft 32 Reinforcing shaft 33 Energizing tube

Claims (4)

In the vacuum vessel, a pair of contact parts that can be freely contacted and separated are arranged,
The pair of contact portions are:
A current-carrying shaft passing through the vacuum vessel;
A longitudinal magnetic field electrode fixed to one end of the energizing shaft in the vacuum vessel and generating a longitudinal magnetic field parallel to the axial direction between the pair of contact portions;
A circular contact plate fixed by closing an opening at one axial end of the cylindrical portion constituting the longitudinal magnetic field electrode;
A magnetic body disposed in an internal space surrounded by the cylindrical portion and the contact plate,
The magnetic body is a hat shape having an annular recess and an annular collar portion extending radially outward from an opening edge of an outer peripheral wall of the annular recess,
The magnetic body is disposed in the internal space with the opening of the annular recess facing the center side of the back surface of the contact plate and the annular collar facing the outer peripheral side of the back surface of the contact plate. A vacuum valve characterized by   2. The vacuum valve according to claim 1, wherein a plurality of magnetic slits extending radially from a part of the annular recess toward the annular collar are formed in the magnetic body. The longitudinal magnetic field electrode has a cup shape in which a bottom portion is formed at the other axial end of the cylindrical portion, and the bottom portion is fixed to one end of the energizing shaft,
The vacuum valve according to claim 1, wherein a plurality of electrode slits are formed in the cylindrical portion so as to cross obliquely with respect to the axial direction.   The current-carrying shaft is composed of a non-magnetic reinforcing shaft and a conductive current-carrying tube attached to the outer periphery of the reinforcing shaft, and the current-carrying tube is fixed to the bottom of the longitudinal magnetic field electrode, and the reinforcement The vacuum valve according to claim 3, wherein a shaft passes through the bottom and is fixed to the back surface of the contact plate.

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