JP2016058275A - Vacuum valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a contact resistance property by surely bringing a stationary-side contact and a movable-side contact into contact with each other.SOLUTION: A vacuum valve includes: a vacuum insulation container 1; a stationary-side sealed metal fitting 2 and a movable-side sealed metal fitting 3 which are sealed to the vacuum insulation container 1; a stationary-side electrification shaft 4 which is fixed while penetrating the stationary-side sealed metal fitting 2; a stationary-side contact 6 which is fixed within the vacuum insulation container 1 of the stationary-side electrification shaft 4; a movable-side contact 20 which is in contact with and isolated from the stationary-side contact 6; and a movable-side electrification shaft 11 which is fixed to the movable-side contact 20 and moves in the movable-side sealed metal fitting 3. A counterbored hole 7 is provided on a contact surface of the stationary-side contact 6, and a contact surface of the movable-side contact 20 is made into a protruding spherical surface. Therefore, even if core displacement occurs in the movable-side electrification shaft 11, the movable-side contact 20 can be surely brought into line-contact with the stationary-side contact 6.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a vacuum valve that can improve contact resistance characteristics of a contact.

  Conventionally, vacuum valves with a pair of contactable contacts have been difficult to maintain the parallelism of the contact surfaces of the contacts. Counterbore holes are provided to prevent point contact at least at the center and improve contact resistance characteristics. In addition, the one that prevents the arc from concentrating is known (for example, see Patent Document 1).

  A vacuum valve of this type is shown in FIG. 6, and a fixed-side sealing fitting 2 and a movable-side sealing fitting 3 are sealed at both end openings of a cylindrical vacuum insulating container 1 made of alumina porcelain. A fixed-side energizing shaft 4 is fixed through the fixed-side sealing fitting 2. For example, a fixed-side electrode 5 that generates a longitudinal magnetic field is fixed to an end of the fixed-side conductive shaft 4 in the vacuum insulating container 1. A fixed-side contact 6 made of a copper alloy is fixed to the fixed-side electrode 5, and a circular fixed-side counterbore hole 7 is provided at the center of the contact surface. A movable contact 9 facing the fixed contact 6 and provided with a circular movable counterbore 8 on the contact surface is provided so as to be able to contact and separate. A movable electrode 10 that generates a magnetic field similar to that of the fixed electrode 5 is fixed to the movable contact 9. An end portion of a movable energizing shaft 11 that movably penetrates the movable side sealing fitting 3 is fixed to the movable electrode 10. One end of a telescopic cylindrical bellows 12 is sealed at an intermediate portion of the movable side energizing shaft 11, and the other end is sealed at an opening of the movable side sealing fitting 3. Thereby, the movable-side energizing shaft 11 can be moved in the axial direction while maintaining the vacuum of the vacuum insulating container 1. A cylindrical arc shield 13 that prevents diffusion of metal vapor is provided around the fixed contact 6 and the movable contact 9, and the outer peripheral portion is fixed to the inner protrusion 14 of the vacuum insulating container 1.

  In such a configuration, the movable energizing shaft 11 is operated by an operating mechanism (not shown), but may cause misalignment that does not move parallel to the axial direction due to manufacturing errors or assembly errors of components. Then, in the movable contact 9, the parallelism with the fixed contact 6 is not maintained, and the central axis of the movable energizing shaft 11 is not limited to the provision of the fixed and movable counterbore holes 7 and 8. If the center is displaced by a predetermined angle or more, as shown by a two-dot chain line in the figure, point contact is caused at the outer peripheral portion, resulting in an increase in contact resistance.

  On the other hand, even if the center axis of the movable-side energizing shaft 11 is misaligned, the fixed-side contact 6 has a recessed spherical shape and the movable-side contact 9 protrudes in a spherical shape so that surface contact can be made to contact the entire contact surface. Is known (see, for example, Patent Document 2). However, in order to make surface contact, the curvature of each spherical surface has to be the same throughout the entire area, which takes a lot of time in manufacturing and assembly adjustment, and is difficult. If surface contact is not possible, point contact will occur at the protruding portion.

  For these reasons, even if it is attempted to maintain the parallelism of the contact surface or to make the curvature of the spherical surface the same, it is often accompanied by a difficult operation and a point contact is often caused. For this reason, there has been a demand for a line contact that surely contacts in a linear shape having an area larger than at least point contact. As a result of the line contact, the work resistance becomes easier and the contact resistance characteristics can be improved than those aimed at the surface contact.

JP-A-9-115397 JP 2014-7081 A

  The problem to be solved by the present invention is that the fixed contact 6 and the movable contact 9 are reliably in line contact with each other even if the center axes of the fixed energizing shaft 4 and the movable energizing shaft 11 are misaligned. An object of the present invention is to provide a vacuum valve capable of improving the characteristics.

  In order to solve the above problems, an embodiment of the vacuum valve is a vacuum valve having a vacuum insulating container, a fixed contact provided in the vacuum insulating container, and a movable contact contacting and separating from the fixed contact. Further, a counterbore hole is provided in the contact surface of the fixed side contact, and the contact surface of the movable side contact has a spherical shape protruding.

Sectional drawing which shows the structure of the vacuum valve which concerns on Example 1 of this invention. Sectional drawing explaining operation | movement of the vacuum valve which concerns on Example 1 of this invention. Sectional drawing which shows the structure of the contact of the vacuum valve which concerns on Example 2 of this invention. Sectional drawing which shows the structure of the contact of the vacuum valve which concerns on Example 3 of this invention. The top view which shows the structure of the contact of the vacuum valve which concerns on Example 4 of this invention. Sectional drawing which shows the structure of the conventional vacuum valve.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a vacuum valve according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view illustrating a configuration of a vacuum valve according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating an operation of the vacuum valve according to the first embodiment of the present invention. In addition, the same code | symbol was attached | subjected to the component similar to the past.

  As shown in FIG. 1, a fixed-side sealing metal fitting 2 and a movable-side sealing metal fitting 3 are sealed at both end openings of a cylindrical vacuum insulating container 1 made of alumina porcelain. A fixed-side energizing shaft 4 is fixed to the fixed-side sealing metal fitting 2 at the center. For example, a fixed-side electrode 5 that generates a longitudinal magnetic field is fixed to an end of the fixed-side conductive shaft 4 in the vacuum insulating container 1. A fixed-side contact 6 made of a copper alloy is fixed to the fixed-side electrode 5, and a circular fixed-side counterbore hole 7 is provided at the center of the contact surface. These fixed sides have the same configuration as the conventional one.

  On the movable side, a spherical movable side contact 20 facing the fixed side contact 6 and projecting from the center part of the contact surface made of a copper alloy is provided so as to be able to contact and separate. A movable electrode 10 that generates a magnetic field similar to that of the fixed electrode 5 is fixed to the movable contact 20. The end of the movable side energizing shaft 11 that passes through the opening of the movable side sealing metal fitting 3 is fixed to the movable side electrode 10. One end of a telescopic cylindrical bellows 12 is sealed at an intermediate portion of the movable side energizing shaft 11, and the other end is sealed at an opening of the movable side sealing fitting 3. Thereby, the movable-side energizing shaft 11 can be moved in the axial direction while maintaining the vacuum of the vacuum insulating container 1. A cylindrical arc shield 13 for preventing diffusion of metal vapor is provided around the fixed side contact 6 and the movable side contact 20, and the outer peripheral portion is fixed to the inner surface protruding portion 14 of the vacuum insulating container 1.

  Next, the case where the center axis of the movable energizing shaft 11 is misaligned with the fixed energizing shaft 4 by θ degrees (several degrees) will be described with reference to FIG.

  As shown in FIG. 2, when the movable-side energizing shaft 11 is moved in the direction of the fixed-side contact 6 by an operation mechanism (not shown), the movable-side contact 20 is inclined, but the contact surface is spherical. Line contact is made with the peripheral edge of 7 in contact with at least an arcuate line. If the inner diameter of the fixed side counterbore 7 is smaller than the outer diameter of the movable contact 20 and the radius of curvature of the movable contact 20 is larger than the diameter of the vacuum insulating container 1, the movable energizing shaft 11 is misaligned by several degrees. Even if it raises, line contact can be made. The tip (top) of the movable contact 20 does not contact the bottom of the fixed side counterbore 7 when contacting the contact.

  If the movable energizing shaft 11 is not misaligned, an annular line contact is made that contacts the entire circumference of the peripheral edge of the fixed side counterbore hole 7. In the curved surface processing of the movable side contact 20 and the hole processing of the fixed side counterbore hole 7, a large precision is not required, and the processing is easy in a short time. Further, since the outer peripheral portion of the spherical movable contact 20 does not come into contact with the fixed contact 6 and becomes a region where the arc is ignited, the generation of a magnetic field by the fixed electrode 5 and the movable electrode 10 greatly improves the breaking characteristics. Contribute.

  According to the vacuum valve of the first embodiment, since the fixed side counterbore hole 7 is provided on the contact surface of the fixed side contact 6 and the contact surface of the movable side contact 20 has a spherical shape protruding, Even if the shaft is misaligned, the movable side contact 20 makes a line contact around the fixed side counterbore hole 7 in a circular arc shape. For this reason, a contact area increases compared with a point contact, and a contact resistance characteristic can be improved.

  Next, a vacuum valve according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view illustrating the configuration of the contact of the vacuum valve according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in the shape of the fixed contact. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, the fixed-side contact 21 fixed to the fixed-side electrode 5 is annular. A portion corresponding to the fixed side counterbore hole 7 of the first embodiment is opened. Note that the tip of the movable contact 20 does not contact the fixed electrode 5 through the annular opening when contacting the contact.

  According to the vacuum valve of the second embodiment, in addition to the effects of the first embodiment, the shape of the stationary contact 21 can be diversified.

  Next, a vacuum valve according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view illustrating the configuration of the contact of the vacuum valve according to the third embodiment of the present invention. The difference between the third embodiment and the second embodiment is that the components are changed between the inner periphery and the outer periphery of the contact. In FIG. 4, the same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the fixed contact 21 is composed of a first fixed contact 21a on the inner peripheral side and a second fixed contact 21b on the outer peripheral side. The movable contact 20 is also composed of a first movable contact 20a on the inner peripheral side and a second movable contact 20b on the outer peripheral side. The first fixed-side contact 21a and the first movable-side contact 20a have the same outer diameter, and are made of a conductive copper alloy mainly composed of Ag and Cu. The second fixed-side contact 21b and the second movable-side contact 20b have the same outer diameter, and are arc-resistant copper alloys mainly composed of Cu and Cr. The first fixed side contact 21a and the first movable contact 20a are in contact with each other, and the second fixed side contact 21b and the second movable contact 20b are not in contact with each other and an arc is ignited. Note that the first fixed-side contact 21a may be protruded more to the movable side than the second fixed-side contact 21b.

  According to the vacuum valve of the third embodiment, in addition to the effects of the second embodiment, the contact resistance can be suppressed by the first fixed side contact 21a and the first movable side contact 20a. The breaking characteristics can be improved by the contact 21b and the second movable contact 20b.

  Next, a vacuum valve according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 5 is a top view showing the configuration of the contact of the vacuum valve according to the fourth embodiment of the present invention, where (a) is a fixed side and (b) is a movable side. The fourth embodiment is different from the third embodiment in that a slit is provided on the outer periphery of the contact. In FIG. 5, the same components as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, the second fixed side contact 21b is provided with a plurality of arc-shaped fixed side slits 22 extending in the radial direction from the end of the first fixed side contact 21a. The second movable contact 20b is also provided with a plurality of arcuate movable slits 23 extending in the radial direction from the end of the first movable contact 20a. In the fixed side contacts 6 and 21 and the movable side contact 20 of the first and second embodiments, a plurality of slits can be provided on the outer peripheral side.

  According to the vacuum valve of the fourth embodiment, in addition to the effects of the third embodiment, the arc can be driven in the circumferential direction by the fixed side and movable side slits 22 and 23.

  According to the embodiment described above, the fixed-side contact has an opening at the center and the movable-side contact has a spherical shape protruding so that the central axis of the movable-side energizing shaft is the fixed-side energizing shaft. Even if misalignment occurs, the fixed contact and the movable contact can be reliably brought into line contact, and the contact resistance characteristics can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Vacuum insulation container 6, 21 Fixed side contact 7 Fixed side counterbore hole 9, 20 Movable side contact 20a 1st movable side contact 20b 2nd movable side contact 21a 1st fixed side contact 21b 2nd fixed side contact 22 Fixed side slit 23 Movable side slit

Claims (5)

A vacuum insulation container;
A fixed contact provided in the vacuum insulating container;
A vacuum valve having a movable contact contacting and separating from the fixed contact,
A counterbore hole is provided on the contact surface of the fixed contact,
A vacuum valve characterized in that the contact surface of the movable side contact has a protruding spherical shape. A vacuum insulation container;
A fixed contact provided in the vacuum insulating container;
A vacuum valve having a movable contact contacting and separating from the fixed contact,
The fixed side contact is annular,
A vacuum valve characterized in that the contact surface of the movable side contact has a protruding spherical shape. The fixed side contact is composed of an inner peripheral first fixed contact and an outer peripheral second fixed contact,
The movable contact is composed of a first movable contact on the inner peripheral side and a second movable contact on the outer peripheral side,
The first fixed side contact and the first movable side contact are made of a conductive copper alloy,
The vacuum valve according to claim 1 or 2, wherein the second fixed side contact and the second movable side contact are made of arc-resistant copper alloy.   The vacuum valve according to any one of claims 1 to 3, wherein a plurality of slits extending in a radial direction are provided on an outer peripheral side of the fixed side contact and the movable side contact. Fixing a fixed side electrode for generating a magnetic field to the fixed side contact;
The vacuum valve according to any one of claims 1 to 4, wherein a movable side electrode for generating a magnetic field similar to that of the fixed side electrode is fixed to the movable side contact.

Images