JPS6185731A - Vacuum interrupter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a vacuum interrupter, and in particular to a so-called fhIl which applies an axial magnetic field parallel to the arc.
BACKGROUND OF THE INVENTION 2. Description of the Related Art Related to Field Application Vacuum Interrupters Conventionally, as an Eftla field application vacuum interrupter, one disclosed in Japanese Patent Application Laid-Open No. 109480/1983 is known. This vacuum interrupter is the fourth
As shown in FIG. 1, insulating cylinders 2a and 2b having the same diameter as the metal cylinder 1 are fixed to both ends of the metal cylinder 10, respectively, to form a cylinder 3. The open ends of the metal tubes 2a and 2b are metal ends &4
a and 4 b, and the inside is evacuated to a high vacuum to form a vacuum container 5. Recesses 11s6a and 6b are formed on the atmosphere side by protruding each metal end plate 4a to a 4-bit vacuum level (inside the vacuum container 4).

Inside the vacuum vessel 5, there are fixed 'm+
ii. The rod 7 is hermetically introduced, and the other metal end plate 4b
A movable X-shaft rod 8 which can be moved toward and away from the fixed electrode rod 7 is airtightly introduced through a bellows 9. Here, the bellows 9 is provided so as to protrude inside the vacuum container 5 so that the outside thereof is under high vacuum. A pair of fixed electrodes 10 and a movable electrode 11, which can be moved toward and away from each other, are fixed to the inner ends of the fixed electrode rod 7 and the movable electrode rod 8, respectively. Further, shields 12 and 13 are attached to the fixed electrode rod 7 and the movable electrode rod 8 near the electrodes 10 and 31, respectively. Coil-shaped magnetic field generating members 14 , 15 connected in series with electrodes 10 , 11 are disposed in each of the recesses 5 a , 5 b , and these magnetic field generating members 14 , 1
5 to generate a magnetic field parallel to the arc.

Electrical connection between the magnetic field generating members 14 and 15 and the electrode rods 7 and 8 is made via a) weights 16 and 17.

Problems that the invention seeks to resolve The vacuum interrupter of the η·ru6 structure does not have the drawbacks of having a complicated structure and poor durability, unlike those in which a magnetic field generating member is provided on the back of the electrode. In addition, there are no problems such as heat generation due to an increase in the size of the vacuum interrupter and an increase in the number of filters to ensure magnetic flux density, unlike those in which a magnetic field generating member is provided on the outer periphery of the cylindrical body of a true container. However, in the above vacuum interrupter, the distance between the identification 7I+ pole 10 and the metal end plate 4a on the fixed side is very narrow;
The distance between 1 and the metal end &4b on the movable side is wide. This means that the length of the bellows 9 in the ・h direction is generally 1 pole 10,
This is because the bellows 9 is provided so as to protrude inward of the vacuum vessel 5. In this way, if the fixed side and the movable side are asymmetrical with respect to the axial center plane when the electrodes 10 and 11 are opened, the electric field distribution becomes uneven and the withstand voltage characteristics become very poor. , which will cause flashbacks. The problem caused by such non-uniform electric field distribution becomes more pronounced as the voltage becomes higher.

Therefore, if the distance between the fixed ionization 10 and the metal end plate 4a on the fixed side is widened to make the fixed side and the movable side symmetrical, the vacuum interrupter becomes larger in the axial direction, and the recesses in the metal end plates 4&, 4b The effect of miniaturization by arranging the magnetic field generating members 14 and 15 at 5a and 5b is lost. Furthermore, as the distance between the magnetic field generating members 14 and 15 increases, the magnetic field generating members 14 and 15 are separated from the electrodes 10 and 11, causing the problem that the magnetic field no longer works effectively and the breaking performance deteriorates.

Furthermore, in the past, the entire current f was passed through the magnetic field generating member. For this reason, heat generation occurs in proportion to the coil length, making it difficult to increase the current flow using conventional methods.

Means for Solving the Problems This invention provides two side plates f71. A concave portion is formed in the atmosphere by protruding toward the sky side, a fixed electrode rod is introduced into the container from one concave portion, a movable electrode is introduced from the other concave portion via a bellows, and the ends of both electrode rods are introduced into the container. W pole? A gold JIJi member having a predetermined resistance value is inserted in the middle of the fixed electrode rod, and a coil-shaped 61 field generation member is disposed in the one concave portion at one electrode rod at the 1i1ii end of this metal member. member t
The reason lies in the fact that they are connected in a continuous manner, and a magnetic material is provided in the atmosphere 11+1 of the other concave hole (1).

Operation Since the vacuum interrupter is configured as described above, the current flowing through the magnetic field generating member is determined by the resistance value of the metal member inserted in the fixed electrode rod. That is, since the current is shunted, no current flows through the magnetic field generating member. Therefore, heat generation of the magnetic field generating member can be suppressed. Further, since the current flowing through the magnetic field generating member is reduced, the generated magnetic flux is also reduced, but in order to compensate for this, a magnetic body is provided to apply pressure so that the magnetic flux is concentrated on the electrode side.

Embodiment Hereinafter, referring to the drawings, the present invention will be explained based on one embodiment. The same parts as in FIG. 4 are designated by the same reference numerals.

In FIG. 1, a fixed electrode rod 7 includes a first electrode electrode 7a introduced airtightly from a metal end plate 4a, and this first heavy pole, Nl 7.
aK is formed from a second electric charge rod 7b connected via a metal member 20 having a predetermined resistance value. 1st. Second
A coil-shaped magnetic field generating member 21 housed in the recess 6a is electrically connected to the electric orange squeezers 7a and 7b. That is, the magnetic field generating member 21 is electrically connected to the metal member 20 in parallel.

Note that the resistance value of the metal member 20 is set in advance so as to be somewhat larger than or approximately equal to the resistance value of the two magnetic field generating members. The metal member 20 is made of, for example, an alloy of a single Fe-based element or a compound element.

The eight electrode rods are introduced airtightly from the metal end plate 4b1J- through the bellows 22 disposed on the atmosphere side of the recess 6b. 23 is JU”: a magnetic material consisting of a disk or block,
This magnetic member is disposed at the back of the electrode in the recess s6b on the movable side. Further, the magnetic material n is, for example, a single Fe-based element or an alloy consisting of a plurality of elements.

As described above, a metal member 20 having a predetermined resistance value is inserted in the middle of the fixed electrode rod 7 of the vacuum interrupter, and a part of the current is supplied to the fixed electrode rod 7 with a resistance value that is similar to or slightly smaller than the resistance value of the metal member. Since the current is shunted to the magnetic field generating member 21 so that the entire current does not flow through the magnetic field generating member 21, heat generation in the magnetic field generating member 210 can be suppressed. Furthermore, since the magnetic body 23 is disposed behind the movable W pole 11, a magnetic path is formed. Therefore, even when the current flowing through the magnetic field generating member 21 is made approximately equal to the current flowing through the metal member 20, the magnetic body 23
Since the magnetic flux can be concentrated at the electrodes 10 and 11, improved breaking performance can be obtained due to the action of the magnetic field.

2 and 3 show the second and third embodiments of the present invention, and FIG. 43.2 shows the magnetic material 23 neatly arranged on the opening surface of the recess 6b; The figure shows magnetic material 2
The insulating tube 24 is placed along the side wall surface of the recess 6b, and an insulating tube 24 is placed on the inner wall surface of the magnetic body 23 to prevent contact with the bellows 22. Both embodiments have the same effects as above.

In addition, in the above practical example, the magnetic field generating member 21 was provided only on the fixed side, but the present invention is not limited to such an embodiment, and the magnetic field generating member may be provided only on the movable side. It may be provided on both the identification side and the movable side. Furthermore, although the cylindrical body of the vacuum container 5 is shown as an example in which the insulating tubes 2a and 2b are fixed to both ends of the metal tube 10, the cylindrical body 3 may be entirely formed of an insulating material. Further, the cylinder 3 has a cylinder portion made of metal or at least both ends made of an insulating material, and a radially inner insulating material 7 at both ends of the cylinder portion.
A lunge may also be formed.

Effects of the Invention As described above, according to the present invention, a vacuum container is formed by providing a concave portion in the air with the metal end protruding toward the nitrogen side of the metal plate, and an electrode is placed inside the vacuum container so that the center surface in the axial direction Since the structure is symmetrical and the bellows and magnetic material are provided on the large side of the movable cylinder and the end plate of the pole, the electric field distribution is uniform and the withstand voltage can be improved. Further, according to this invention,
The strength of the magnetic field was halved by allowing the magnetic material to be placed close to the electrode and allowing approximately half of the flow to flow through the magnetic field generating member.
The magnetic flux electric power between the F poles can be made approximately the same ζ·l as when the entire force is passed through the coil, and together with the above case, the breaking performance is improved. Furthermore, according to the present invention, the current flowing through the magnetic field generating member is approximately halved, thereby reducing heat generation in the magnetic field generating member.

Therefore, it is possible to increase the throughput.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, and FIGS. 2 and 3 are longitudinal sectional views 1+, TE, and 4 showing the second and third embodiments of the invention. FIG. 5... Soldier, empty container, 5a, 5b... recess, 7...
Fixed electrode bar, 8... Movable city pole bar, 10... Fixed stack, 11... Movable electrode, 20... Gold M member, 21...
- Magnetic field generating member, 22... bellows, 23... magnetic material.

Claims (1)

[Claims] (1) At least both ends of the cylindrical body are made of an insulator, and both ends are closed with metal end plates, the interior is made into a high vacuum, and each of these metal end plates is made to protrude toward the vacuum side, thereby creating a recess on the atmosphere side. A fixed electrode rod is airtightly introduced into the vacuum container from one metal end plate, and a movable electrode rod that can freely approach and separate from the fixed electrode rod is inserted from the other metal end plate into the vacuum container. Introduced airtight via bellows,
In a vacuum interrupter in which a pair of electrodes is provided at each inner end of each of these electrode rods, and the electrodes are movable toward and away from each other, the vacuum container and the electrodes are arranged symmetrically with respect to the axial center plane when the electrodes are opened. and a coil-shaped magnetic field generating member that generates a magnetic field parallel to the arc generated between the electrodes is disposed in at least one of the recesses, and the resistance value is slightly higher or lower than the resistance value of the magnetic field generating member. The magnetic field generating member is connected to the fixed electrode rod so that the conductive current is divided between the fixed electrode rod and the magnetic field generating member by inserting a metal member with a metal member in the middle of the current carrying path of the fixed electrode rod, and 1. A vacuum interrupter characterized in that the metal end plate on the movable side protrudes into a recess so as to create a high vacuum, and a magnetic material is disposed on the atmosphere side of the recess.