JPS6318293B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum shear breaker, and more particularly to a vacuum sheath breaker in which means for generating an axial magnetic field parallel to the shear arc is provided at the back of the electrode.

In recent years, by applying an axial magnetic field parallel to the arc, it is possible to disperse the arc on the electrode surface and prevent its concentration, thereby improving the shearing ability by preventing excessive melting and overheating of the electrode. Vacuum shields and disconnectors are known.

As shown in FIG. 1, such an arc dispersion type vacuum shield breaker generally has a cylindrical insulating tube 1 made of glass or ceramic, with both ends connected to disk-shaped end plates 2, 2 made of metal. A vacuum container 3 is formed by airtightly closing the interior and evacuating the inside to a high vacuum, and each end plate 2 is attached to each end plate 2 in order to bring a pair of electrodes 4, 4 into contact with and away from each other on the axis of the vacuum container 3. The pair of electrode rods 5 and 5 are introduced from the center of the vacuum container 3 so as to be able to approach and separate from each other while maintaining airtightness of the vacuum container 3, and each electrode 4 and electrode rod 5 are
Coil bodies 6, 6 that generate an axial magnetic field by changing the axial current (vertical direction in FIG. 1) flowing through the electrode rod 5 into a loop current centered on the electrode rod 5.
It is connected and configured by.

However, the connection between the coil body 6, the electrode rod 5, and the electrode 4 in the above-mentioned vacuum shield disconnector has conventionally been performed as shown in FIG.
It had the structure shown in Figure 3. That is, the coil body 6 includes a cylindrical center conductor 7, an inner ring 8 concentrically surrounding the center conductor 7 and having an outer diameter approximately equal to that of the electrode rod, and the center conductor 7 and the inner ring 8.
outer rings 9a, 9b, which are obtained by dividing a ring concentrically around the electrode 4 and having an outer diameter approximately equal to that of the electrode 4;
9c, 9d, and each outer ring 9a, 9b, 9b, 9
first arms 10a, 10b, 10c, 10d extending in the radial direction (left-right direction in FIG. 3) to connect one end of the inner ring 8 with the inner ring 8; Notches 8a, 8b, 8 of the inner ring 8 are used to connect the ends and the center conductor 7.
It is composed of second arms 11a, 11b, 11c, and 11d that extend in the radial direction through the second arms 11a, 11b, 11c, and 11d. The coil body 6 and the electrode rod 5 are connected to each other by coaxially joining the inner ring 8 to the inner end surface of the electrode rod 5, and the coil body 6 and the electrode 4 are connected to each other by connecting the inner ring 8 to the inner end surface of the electrode rod 5. One end (the upper end in FIG. 3) protrudes from the inner ring 8 and is joined to a recess 4a provided at the center of the back of the electrode 4, so that the center conductor 7 of the coil body 6 and the electrode rod 5 are electrically connected. In order to reinforce and support the coil body 6 while preventing it from being directly connected to the coil body 6, a recess 1 is provided at the inner end shaft center of the electrode rod 5 between the other end of the center conductor 7 and the electrode rod 5.
A coil insulating support 13 made of an insulator or a high-resistance metal is interposed concentrically between the coils 2 and 2.

The coil insulating support 13 is formed into a cylindrical shape having an axial length equivalent to the depth of the recess 12 and having a partition wall at the end, and also has a cylindrical shape with a partition wall at the end. Holes 14 and 15 for venting gas are provided in the cylindrical body and the partition wall.

Therefore, the current flowing through the arc A generated on the electrode surface in such a vacuum disconnector flows from the center conductor 7 to each second arm 1, as shown by the imaginary line.
1a, 11b, 11c, and 11d and flows radially outward, and each outer ring 9a, 9
b, 9c, 9d in the same circumferential direction while changing the flow direction, and flowing radially inward from each outer ring 9a, 9b, 9c, 9d to the first arm 10a, 10b, 10c, 10d, inner ring 8
The current flowing through the outer rings 9a, 9b, 9c, and 9d of the coil body 6 generates an axial magnetic field, and the arc A is dispersed on the electrode surface, increasing the cutting capacity. Improvements can be made.

However, when using the connection structure described above,
A coil insulating support 13 is attached to the inner end axis of the electrode rod 5.
It is necessary to provide a recess 12 for storing the electrode rod, and also provide holes 14 and 15 in the coil insulating support 13 for degassing, so machining and assembling these is extremely troublesome, and the electrode rod Components such as 5 are cleaned with chemicals as a pretreatment for brazing in a vacuum, but there is a risk that these chemicals will remain in the recesses 12 and holes 14 and 15, making it difficult to remove them. There are problems such as:

The present invention has been made in view of the above-mentioned problems, and its purpose is to improve the connection structure between the coil body, the electrode rod, and the electrode.
It is an object of the present invention to provide a vacuum chamber and disconnector which can be easily processed and assembled, and which eliminates the risk of chemical residue remaining during pretreatment. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings from FIG. 4 onwards. In the following description, the same components as those of the conventional device described above are given the same reference numerals, and redundant description will be omitted.

4 and 5 are a plan view and a vertical sectional view of the first embodiment of the present invention, in which a recess 16 is provided in the end surface of the inner end axis of the electrode rod 5 introduced into a vacuum container (not shown). A small diameter portion 5a is integrally molded and provided in a protruding manner. Further, the inner end surface of the electrode rod 5 has an inner diameter that is suitably larger than the outer diameter of the small diameter portion 5a, an outer diameter that is approximately equal to the outer diameter of the electrode rod 5, and an axial length that is approximately equal to that of the small diameter portion 5a. A coil insulating support 17 formed in a cylindrical shape having a diameter is coaxially joined via its base. The coil insulating support 17 is for supporting the inner ring 8 of the coil body 6 while electrically insulating it from the electrode rod 5, as will be described later, and is made of an insulator or a high-resistance metal such as stainless steel. As shown in FIG. 6, a plurality of notches 18 (three in the embodiment) are provided at the end thereof, and a vortex whose body is cut in the axial direction to prevent generation of eddy current. A current prevention slit 19 is provided.

A shunt type coil body 6 is connected to and insulatedly supported by the small diameter portion 5a of the electrode rod 5 and the coil insulating support 17. That is, the coil body 6
As shown in FIGS. 4, 5 and 7,
A center conductor 20 formed in a columnar shape having approximately the same diameter as the small diameter portion 5a of the electrode rod 5, and a coil insulating support 17 that concentrically surrounds the center conductor 20 and has a longer axial length than the center conductor 20. Inner rings 22a, 22b, 22c are made by cutting a cylindrical body having inner and outer diameters that are approximately equal to each other in the axial direction with three slits (notches) 21a, 21b, and 21c into three parts.
, the center conductor 20 and the inner rings 22a, 22
an outer ring 2 which is divided into three rings that concentrically surround b and 22c and have an outer diameter approximately equal to that of the electrode 4;
3a, 23b, 23c, and each outer ring 23a, 2
a first arm 24a, 24b, 24c extending in the radial direction through each slit 21b, 21c, 21a of the inner ring 22a, 22b, 22c to connect one end of the inner ring 3b, 23c with the center conductor 20; Each first arm 24c, 24a, 24b connects the other end of the outer ring 23a, 23b, 23c and the corresponding inner ring 22a, 22b, 22c.
a second arm 25a extending in the radial direction parallel to the
25b and 25c, and is electrically connected to the electrode rod 5 by fitting the base of the center conductor 20 into the recess 16 of the electrode rod 5 and coaxially connecting it by brazing. , inner ring 2
The base portions of the coils 2a, 22b, and 22c are joined to the end portions of the coil insulating support 17 for insulating support. The inner ring 2 protrudes from the end of the center conductor 20.
The electrodes 4 are fitted into the ends of the electrodes 2a, 22b, and 22c through arc-shaped recesses 4b provided at their backs, and are joined by brazing.

In the vacuum shield breaker having the above configuration, the current flowing through the arc generated on the 4 surfaces of the electrodes is divided into the inner rings 22a, 22b, 22c, and flows into each of the second arms 25a, 25b, 25c.
flows radially outward to each outer ring 23a, 23.
b, 23c, and changes its flow in the same circumferential direction around the center conductor 20. Then, from each outer ring 23a, 23b, 23c, each first arm 2
4a, 24b, and 24c, the flow changes radially inward, and passes through the center conductor 20 to the electrode rod 5.
The outer ring 2 of the coil body 6
The electric current flowing through 3a, 23b, and 23c generates an axial magnetic field, similar to the conventional one, and the arc is dispersed on the electrode surface, improving the cutting performance of the vacuum cutter.

FIG. 8 is a half-cut sectional view of a second embodiment of the present invention. This embodiment has the advantage that the small diameter portion 5a protruding from the inner end shaft center of the electrode rod 5 is manufactured separately, instead of being integrally molded with the electrode rod 5 as in the first embodiment. , arc-shaped reinforcing support parts 26a, 26 for reinforcing and supporting the outer rings 23a, 23b, 23c of the coil body 6, respectively, on the coil insulating support 17.
b, 26c (see FIG. 9) and an arm portion 27a extending in the radial direction to connect each reinforcing support portion and the coil insulating support 17. .

As described above, the present invention introduces a pair of electrode rods into a vacuum container so that the pair of electrodes can approach and separate from each other on the axis of the container, and also move each electrode rod and electrode in the axial direction. In a vacuum shield disconnector connected by a coil body that generates a magnetic field, a small diameter portion is integrally protruded from the inner end axis of the electrode rod, and the coil body is attached to the end of the small diameter portion. The center conductor is coaxially joined, and the base of a cylindrical coil insulating support that concentrically surrounds the small diameter part and has the same axial length as the small diameter part is joined to the inner end surface of the electrode rod, The electrode is connected to the end of the coil insulating support, and an inner ring of a coil body having an axial length longer than the center conductor is coaxially connected via its base, and the inner ring is connected to the center conductor. at least one first arm extending in the radial direction through the notch, and an outer ring of a coil body having a radius of curvature approximately equal to that of the electrode is provided at the end of the first arm, and the outer ring Since the end of the inner ring is connected to the inner ring by a second arm extending in the radial direction, it can be easily processed and assembled, and it can be easily processed and assembled before joining each component. There is no risk of chemicals remaining during the treatment process. Further, since the coil insulating support is disposed outside the center conductor, the reinforcing support portion can be integrally formed with the coil insulating support, and the reinforcing support of the coil body can be strengthened.

In each of the above embodiments, the case where the coil body is a shunt type is described, but the coil body is not limited to this. For example, an annular outer ring with ends and each end of the outer ring and an electrode rod are used. and a first extending radially inwardly to connect with the electrode.
It may be a one-turn type coil body consisting of a second arm, and the center conductor of the coil body is not limited to being integrally molded with the first arm.
For example, it may be integrally molded with the small diameter portion of the electrode rod. The present invention also includes embodiments in which various changes have been made without departing from the technical scope of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a general arc dispersion type vacuum shield breaker, Fig. 2 is an explanatory plan view of the conventional technology, Fig. 3 is an explanatory cross-sectional view taken along the - line in Fig. 2, and Fig. 4 is Plan view of the first embodiment of the present invention, fifth
The figure is a sectional view taken along the line -- in FIG. 4, FIGS. 6 and 7 are respectively perspective views with the main parts of the first embodiment partially cut away, and FIG. 8 is a half-cut sectional view of the second embodiment of the present invention. , FIG. 9 is a partially cutaway perspective view of the main part of the second embodiment. 3... Vacuum container, 4... Electrode, 5... Electrode rod,
5a... Small diameter portion, 6... Coil body, 17... Coil insulation support, 20... Center conductor, 21a, 21
b, 21c...notch, 22a, 22b, 22c
...Inner ring, 23a, 23b, 23c...Outer ring, 24a, 24b, 24c...First arm,
25a, 25b, 25c...second arm.

Claims (1)

[Scope of Claims] 1. A pair of electrode rods is introduced into a vacuum container so that the pair of electrodes can be moved toward and away from each other on its axis, and each electrode rod and electrode are moved in the axial direction. In a vacuum shield disconnector connected by a coil body that generates a magnetic field, a small diameter portion is integrally protruded from the inner end axis of the electrode rod, and the coil body is attached to the end of the small diameter portion. The center conductor is coaxially joined, and the base of a cylindrical coil insulating support that concentrically surrounds the small diameter part and has the same axial length as the small diameter part is joined to the inner end surface of the electrode rod, The electrode is connected to the end of the coil insulating support, and an inner ring of a coil body having an axial length longer than the center conductor is coaxially connected via its base, and the inner ring is connected to the center conductor. at least one first arm extending in the radial direction through the notch, and an outer ring of a coil body having a radius of curvature approximately equal to that of the electrode is provided at the end of the first arm, and the outer ring 1. A vacuum shield disconnector, characterized in that the end of the vacuum shield and the inner ring are connected by a second arm extending in the radial direction. 2. The vacuum shear breaker according to claim 1, characterized in that the coil insulating support body is provided with a reinforcing support portion for reinforcing and supporting the outer ring of the coil body. 3. The vacuum shield breaker according to claim 1, characterized in that the coil insulating support is provided with eddy current prevention slits.