JPS6329368B2 - - 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 an axial magnetic field is applied between electrodes.

In general, a vacuum breaker is a vacuum container, as shown in Fig. 1, which is made of an insulating cylinder 1 made of glass or ceramic, both ends of which are sealed with metal end plates 2, and the inside is evacuated to a high vacuum. 3, a pair of electrode rods 5, 5 which make a pair of electrodes 4, 4, which apply and disconnect current, come into contact and separate from each other at the axial center.
It is constructed by introducing relatively freely approaching and separating.

As shown in FIG. 2, the applicant of the present application has developed a vacuum circuit breaker in which a large current is first applied and then disconnected, by connecting at least one electrode 4 to a main electrode 6 and an electrode rod 5 that are connected to and separated from each other. The flowing current is changed to a loop current centered on the electrode rod 5, a magnetic field is applied in the axial direction (in the vertical direction in Fig. 2), and the magnetic field generating part that generates the magnetic field is connected to the two coiled conductors in opposite directions. We proposed a structure in which the wires are arranged concentrically so that current flows through them. (Patent application 1982-103912, Japanese patent application 1983-103912,
28422) The coil electrode 7 shown as a specific example of this earlier application has a plurality of cylindrical conductors 7a, 7b, 7c, 7
d and 7e concentrically, each cylindrical conductor is connected alternately at opposite ends, and at least two cylindrical conductors are axially connected so as to form axial magnetic fields in mutually different directions. It is configured with a plurality of notched grooves 8a, 8b, 8c, and 8d inclined with respect to the direction, and the outermost cylindrical conductor 7a is connected to the electrode rod 5 via a disk-shaped connection electrode 9. At the same time, the central cylindrical conductor 7e is connected to the main electrode 6.

Therefore, there is a problem in that the axial dimension of the coil electrode 7 and, by extension, the vacuum shield and disconnector becomes large, and the structure becomes complicated, making it extremely difficult to manufacture.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a vacuum shield and disconnector equipped with a coil electrode that is easy to manufacture and whose axial dimension can be reduced. be. below,
Embodiments of the present invention will be described in detail with reference to the drawings from FIG. 3 onwards. In addition, in the following description, the same reference numerals are attached to the structural members that perform the same functions as the conventional structural members.

3 and 4 are a plan view and a longitudinal sectional view of a first embodiment of the electrode 4 in the vacuum breaker according to the present invention. In the figure, 10 is a resistance spacer made of a metal with high mechanical strength and high electrical resistance, such as stainless steel, or a suitable insulator.
It is formed into a substantially cylindrical shape with a partition wall near the end, and its base is joined by means such as brazing to the bottom of a circular recess 11 recessed in the inner end axis of the electrode rod 5. . The resistance spacer 10 is for preventing the main electrode 6 supported by the electrode rod 5 from being directly connected and supported electrically to the electrode rod 5, and has a length approximately equal to the depth of the recess 11. The outer peripheral surface and partition wall thereof are provided with holes 12 and 13 for venting gas during bonding.

The base of a connection spacer 14 made of a metal conductor formed into a cylinder having a radius of 1/2 of the radius of the electrode rod 5 is fitted into the end of the resistance spacer 10 and is joined by brazing or the like. There is. At the end of the connection spacer 14 that is coaxially joined to the resistance spacer 10 and protrudes from the recess 11, a main electrode 6 formed in a substantially disk shape is inserted through a recess 15 provided at the center of its back. They are fitted and joined by brazing or the like.

The inner end surface of the electrode rod 5 has a plurality of holes having an outer diameter approximately equal to the outer diameter of the electrode rod 5 and formed by cutting a plurality of equally spaced circumferential points (four points in the figure). The circular arc portions 16a, 16b,
An annular inner ring 16 consisting of 16c and 16d
are connected and supported so as to concentrically surround the connection spacer 14 via axial connection portions protruding from one end of each of the arcuate portions 16a, 16b, 16c, and 16d. The outer side of the inner ring 16 has a plurality of circular arc parts 17a, 17b, 1 having an outer diameter approximately equal to the outer diameter of the main electrode 6, and is formed by cutting the inner ring 16 at a position corresponding to the cutting position.
An annular outer ring 17 consisting of 7c and 17d is arranged concentrically. The outer ring 17 together with the inner ring 16 constitutes the coil electrode 7.
One end of each arc portion 17a, 17b, 17c, 17d on the side corresponding to the connecting portion of the inner ring 16 and the connecting spacer 14 are a first connecting arm that extends in the radial direction by passing through the cut portion of the inner ring 16. 18a,1
They are electrically connected via 8b, 18c, and 18d. In addition, each arcuate portion 17a, 1 of the outer ring 17
7b, 17c, 17d and the other end of each circular arc portion 16a, 16b, 16c, 16d of the inner ring 16 are located within the same plane in the radial direction of each first connecting arm 1.
8a, 18b, 18c, 18d, and second connecting arms 19a, 19b, 19d extending parallel to each other.
electrically connected via.

Note that the distance between the connection spacer 14 and the inner ring 16 and the distance between the inner ring 16 and the outer ring 17 are approximately equal, and the inner ring 16, the outer ring 17, etc. are mechanically It may be supported on the electrode rod 5 via a support member made of a highly resistant metal or insulator.

With the above configuration, a current I flows through the arter A generated on the contact surface of the main electrode 6 when the electrode 4 approaches and separates.
is connected to each first connecting arm 18 via the connecting spacer 14.
A, 18b, 18c, and 18d are divided into 1/4I and flow in the radial outward direction, and flow through each arcuate portion 17a, 17b, 17c, and 17d of the outer ring 17 in the same circumferential direction. Then, each second connecting arm 19
a, 19b, 19c, 19d and the first connecting arm 1
8a, 18b, 18c, and 18d, and each arcuate portion 16a, 16b, 16c, and 16d of the inner ring 16 flows into the outer ring 17.
It flows in the opposite circumferential direction and flows to the electrode rod 5.

Therefore, as shown in FIG. 5, the currents flowing through each ring 16, 17 flow on the same circumference as a whole, and in opposite directions. Therefore, the current flowing through the inner ring 16 and the outer ring 17 generates axial magnetic fields Φ _a and Φ _b having alternately different polarities in the radial direction (see FIG. 6).

FIG. 7 is a plan view of a main part of a second embodiment of the present invention, in which the coil electrode 7 of the first embodiment described above is arranged concentrically with an inner ring 16 and an outer ring 17. In contrast, the connecting spacer 14 is formed into a cylindrical shape, and the shaft ring 20 is formed by circular arc portions 20a, 20b, 20c, and 20d cut corresponding to the cut portions of the rings 16 and 17. Each arc portion 20 of the ring 20
a, 20b, 20c, 20d so that the current flowing in the inner ring 16 is opposite to the one end of each and each arcuate portion 17a, 17b, 17 of the outer ring 17.
c, 17d to the first connecting arms 18a, 18b, 18
c, 18d, and each arc portion 20a, 20b, 20c, 20d of the shaft ring 20.
The first connecting arms 18a, 18b, 18c, 1 in
The main electrode 6 is connected and supported via an axial protrusion protruding from the end opposite to the connection position with the main electrode 8d.

8 and 9 are plan views of the main parts of the third and fourth embodiments of the present invention, respectively.
In these embodiments, the coil electrode 7 of the first and second embodiments described above is connected to each ring 16, 1.
7 and 20, and a plurality of first and second connecting arms 18 and 19 to connect the rings 1 to each other.
In contrast, each ring 16, 17, 20 is cut at one point, and one first , second
Rings 16 and 1 adjacent to each other by connecting arms 18 and 19
The coil electrode 7 is of a so-called full current type in which the directions of current flowing through the coil electrodes 7 and 20 are different from each other.

As described above, the present invention introduces a pair of electrode rods into a vacuum container so that they can approach and separate from each other in a manner that allows a pair of main electrodes to approach and separate from each other at the axial center of the vacuum container, and
In a vacuum shield disconnector in which at least one electrode rod and a main electrode are connected by a coil electrode that generates an axial magnetic field by changing the current flowing through the electrode rod into a loop current centered on the electrode rod, A recess is provided in the center of the end axis, and the base of the resistance spacer is joined to the bottom of this recess, and a connection spacer is coaxially joined to the end of the resistance spacer so as to protrude from the recess, and this connection The main electrode is joined to the end of the spacer, and a coil electrode consisting of a plurality of rings having mutually different outer diameters and at least one cut portion is arranged concentrically on the outside of the connection spacer. The coil electrodes are connected to the inner end of the electrode rod and the connection spacer by connecting arms extending in the radial direction within the same radial plane so that the currents flowing through adjacent rings are the same but in different directions. Because it was done,
The coil electrode can be manufactured easily and its axial dimension can be significantly reduced.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a general vacuum disconnector.
FIG. 2 is a longitudinal sectional view of the prior art, and FIG. 3 is a plan view of the first embodiment of the electrode of the vacuum shield disconnector according to the present invention.
FIG. 4 is a sectional view taken along the line -- in FIG. 3, FIGS. 5 and 6 are explanatory diagrams of the action of the electrode in FIG. FIG. 7 is a plan view of the main parts of the embodiment, the third embodiment, and the fourth embodiment. 5... Electrode rod, 6... Main electrode, 7... Coil electrode, 10... Resistance spacer, 11... Recess, 14
... Connection spacer, 16, 17, 20 ... Ring, 18, 19 ... Connection arm.

Claims (1)

[Claims] 1. A pair of electrode rods is introduced into a vacuum container so that the pair of main electrodes can approach and separate from each other at the axial center thereof, and at least one of the electrode rods and the main electrode is connected to the electrode rod. In a vacuum shield disconnector connected by a coil electrode that generates an axial magnetic field by changing the current to a loop current centered on the current, a recess is provided at the inner end shaft center of the electrode rod, and the bottom of the recess is provided. The base of the resistance spacer is bonded to the resistor spacer, and the connection spacer is coaxially bonded to the end of the resistance spacer so as to protrude from the recess, and the main electrode is bonded to the end of the connection spacer, and the connection spacer is bonded to the end of the resistance spacer. A coil electrode consisting of a plurality of rings having different outer diameters and at least one cut portion is arranged concentrically on the outside of the spacer, and the current flowing through the coil electrodes is set to the same current. A vacuum shield disconnector, characterized in that the inner end of the electrode rod and the connecting spacer are connected to the inner end of the electrode rod and the connecting spacer by connecting arms that extend in the radial direction within the same radial plane so as to be in different directions.