JPS6180721A - 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 the Invention The present invention relates to a vacuum interrogator, and more particularly to a so-called vertical grinding field application type vacuum interrogator that applies eight fields in an axial direction parallel to an arc.

2. Description of the Related Art Hitherto, as a vacuum interrupter of the vertical output field application type, one disclosed, for example, in Japanese Patent Application Laid-Open No. 109480/1983 has been known.

As shown in FIG. 2, this vacuum interrupter has insulating tubes 2a and 2b each having the same diameter as the metal tube 1 at both ends of the metal tube 1.
are fixed to form the cylindrical body 6. Then, the open ends of these metal tubes 2a, 2b are closed with metal end plates 4a, 4b, and the insides are evacuated to a high vacuum to form the J''c22 container 5.
is formed. Each metal end plate 4a, 4b has an X receiving side (
Four parts 6a and 6b are formed on the atmosphere side by protruding into the vacuum container 4 (inward).

A fixed electrode rod 7 is airtightly introduced into the vacuum vessel 5 from one metal end plate 4FL, and a movable electrode rod 8 that can move toward and away from the fixed electrode rod 7 is introduced from the other metal end plate 4b. It is airtightly introduced through a 9-karat gold bellows. Here, the bellows 9 is provided so as to protrude inside the 7G nitrogen container 5 so that the outside thereof is in a high vacuum. A pair of fixed electrodes 10 and a movable electrode 11, which can be freely 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 11, respectively.

Further, in each of the recesses 6a and 6b, magnetic field generating members 14 and 15 such as coils are connected in series with the electrodes 10 and 11 to supply a current, thereby generating a magnetic field parallel to the arc.
is installed. Electrical connection between these magnetic field generating members 14.15 and the electrode rods 7, 8 is made via current collectors 16.17.

Problems to be Solved by the Invention The vacuum interrupter having such a structure does not have the disadvantages of having a gold film of a magnetic field generating member on the back of the electrode (for example, as in Japanese Patent Publication No. 54-228131, which has a complicated structure and poor durability). In addition, by installing a magnetic field generating member on the outer periphery of the cylinder of the true receiver, the size of the X-nitride interrogator and the magnetic flux IIB
There are no problems such as heat generation caused by increasing the number of filters for accuracy.

However, in the above self-empty interrupter, the distance between the fixed electrode 10 and the metal end plate 4a on the fixed side is narrow, whereas the distance between the movable electrode 11 and the metal end plate 4b on the movable side is wide. This means that the length of the bellows 90 in one direction is generally 4 times the opening gap when the r°C electrodes 0 and 11 are opened.
~5 times the amount is required, and the bellows 9a7C empty container 5
This is due to the fact that it is provided so as to protrude inward. 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 will be uneven and the withstand voltage characteristics will be very poor, causing flashover. It will cause it. Due to such non-uniform electric field distribution! ! g
becomes more pronounced as the voltage level increases.

However, the fixed electrode 10 and the metal end plate 4a on the fixed side
If the fixed side and movable side are made symmetrical by widening the distance between them, the true interrupter becomes larger in the axial direction, and the metal end plate 4
Magnetic field generating members 14.15t are placed in the recesses 6a and 6b of a and 4b.
-The effect of the arrangement and miniaturization will be lost. Further, as the distance between the magnetic field generating members 14 and 15 increases, the magnetic field generating member 14 is separated from the electrodes 10 and 11, causing the problem that the magnetic field does not work effectively and the breaking performance deteriorates.

Further, since the bellows 9 is provided so that the outside thereof is under high vacuum and the inside thereof is under atmospheric pressure, there is a possibility that a buckling phenomenon may occur. The reason why many conventional vacuum interrupters have adopted the above-mentioned outward high and large hollow shape despite the possibility of buckling of the bellows is as follows.

In other words, if the bellows is provided to protrude outward from the IIc nitrogen container in order to make the inner chamber nitrogen type, the thinness of the bellows will cause damage or deformation, which will shorten the service life and cause vacuum leakage. It is.

A precautionary measure to solve all the problems In order to solve the above problems, the present invention solves the problems as follows.
Nitrogen interlayer was added to the groove bottom.

In the 32 interrogator of the present invention, at least both ends of the cylindrical body are made of an insulating material, both ends of which are closed with metal end plates, the interior is made into a high vacuum, and each of these metal end plates'tx
By protruding toward the nitrogen side, a recess is provided on the atmosphere side to form one vacuum container.

Then, a fixed electrode rod is introduced into the vacuum container airtightly from one metal end plate, and a movable electrode rod that can move toward and away from the fixed electrode rod is airtightly introduced from the other metal end plate via a bellows. has been introduced. Furthermore, a pair of fixed electrodes and movable electrodes that can be freely moved toward and away from each other are provided at the inner ends of each of the fixed electrode rods and the movable electrode rods.

Furthermore, the vacuum vessel and both electrodes are installed so as to be symmetrical with respect to the axial center plane. A magnetic field generating member that generates a magnetic field in an axial direction parallel to the arc generated between both electrodes is disposed in at least one of the recesses.Furthermore, at least a fixed member on the opposite side to the full on which this magnetic field generating member is disposed is disposed. Alternatively, all the magnetic members are bonded to the back surface of one movable pole.In other words, for example, in case S where all the magnetic field generating members are arranged only on the fixed side, at least the movable electrode is wetted with a rupturable member, and the movable side When the magnetic field generating member is disposed only in the fixed electrode, the magnetic member is entirely bonded to at least the fixed electrode.

Furthermore, the bellows is provided so as to protrude into the recessed portion of the metal end plate on the movable side so that a high vacuum is created inside the bellows.

Materials for the rupture member used in the present invention include, for example, pure metals such as iron, metal, or cobalt, or composite metals thereof; Composite metals are suitable.

On the other hand, in the present invention, the rupture member is joined to the electrode by
Due to the following reasons. That is, for example, if the magnetic field generating member is provided only on the fixed side, the radius of the inner circumference of the magnetic field generating member is a% the distance from the axial center plane of the magnetic field generating member to the axial center plane between the electrodes [-X] , the strength H of the magnetic field on the central axis on the electrode surface when a vertical host field is applied by the electric current flowing through the magnetic field generating member is H= a2I/2 (&"+X"
)2 (AT/m). Therefore, the distance
If the length is long, the strength H of the longitudinal magnetic field will be insufficient, which will reduce the cutting ability. That is, when a magnetic field generating member is provided on the fixed side, the magnetic field at the movable electrode is weakened. Therefore, it was decided to join a magnetic member to at least the movable electrode to compensate for the deficiency in the longitudinal magnetic field.

In a vacuum interrupter with such a configuration, when the operating mechanism connected to the outer end of the movable electrode rod is activated and the movable electrode rod is separated from the fixed electrode rod, the bellows is extended and the electrodes are opened, causing the current to flow. It will be cut off. At this time, the magnetic field H
The magnetic member present in the magnetic member is magnetized to produce magnetic poles N and S on both end faces thereof. Within the magnetic member, the magnetic poles generate a self-demagnetizing force in the opposite direction to the magnetic field H, but a magnetic field in the same direction as the magnetic field H generated by the magnetic field generating member is generated between the electrodes to compensate for the longitudinal magnetic field. Further, at the time of the cutoff, the vacuum container and both electrodes are symmetrical with respect to the axial center plane of the true receptor. Therefore, the state of electric field distribution within the vacuum container becomes uniform.

EXAMPLE Hereinafter, the present invention will be explained in detail based on an example shown in FIG. It should be noted that the same parts as in the prior art are indicated by the same reference numerals as in FIG. 2, and their explanation will be omitted.

In the vacuum interrupter of the present invention, for example, as shown in FIG. 1, the vacuum container 5 is formed symmetrically with respect to its axial center plane. Further, the fixed electrode 10 and the movable electrode 11 are arranged so as to be symmetrical with respect to the axial center plane of the vacuum container 5 when the electrode 10.11 is opened. Furthermore, these fixed electrodes 10 and movable electrodes 11
On each back side, a disc-shaped a-type member 1 made of Fe-Ni is attached.
8°19 are joined. Here, the electrodes 10 and 11 and the electrode rods 7 and 8 may be directly connected through the magnetic members 18 and 19, or may be indirectly connected through the magnetic members 18 and 19. Reference numeral 20 denotes a magnetic field generating member disposed on the four parts 6a of the metal end plate 4a on the fixed side.

On the other hand, a bellows 21 for airtightly introducing the movable electrode rod 8 into the vacuum container 5 is provided so as to protrude into the recess 6b of the metal end plate 4b on the movable side so that a high vacuum is created inside the bellows 21.

In the vacuum interrupter having such a configuration, the movable electrode rod 8
An operating mechanism (not shown) connected to the outer end of the
When the movable electrode rod 8 separates from the fixed electrode rod 7, the bellows 21 expands and the electrodes 10.11 open, cutting off the current.

At this time, the current flowing through the magnetic field generating member 20 causes the electrode i to
A parallel magnetic field is applied to the arc generated between o and i1. Also, the magnetic members 18 and 19U are magnetized because they are placed in a magnetic field, producing magnetic poles N and S on both end faces, and a magnetic field in the same direction as the magnetic field generated by the magnetic field generating member 20 is generated between the poles 10 and 11. bring about Additionally, the longitudinal magnetic field for the arc is strengthened.

Further, when cut off, both electrodes 10.11 are connected to the vacuum container 5.
It is symmetrical about the axial center plane of. Therefore, the distance between the fixed electrode 10 and the metal end plate 4a on the fixed side is equal to the distance between the movable electrode 11 and the metal end plate 4b on the movable side. Thereby, the state of electric field distribution within the vacuum container 5 becomes uniform.

In the above embodiment, the magnetic field generating member 20't- was provided only on the fixed side, but the present invention is not limited to this embodiment, and the magnetic field generating member 20't- may be provided only on the movable side. Further, it may be provided on both the fixed side and the movable side. In this case, when the magnetic field generating member is provided only on the movable side, the magnetic member needs to be bonded to at least the fixed electrode 10.

Furthermore, the cylindrical body 6 of the vacuum container 5 is an example in which insulating cylinders 2a and 2b are solidly layered on both ends of the metal cylinder 1, and the ratio is as follows.
The entire cylindrical body 6 may be made of an insulating material. Also,
The cylindrical body 6 may have a cylindrical portion made of metal or at least both ends made of an insulating material, and seven radially inner flanges made of an insulating material formed at both ends of the cylindrical portion.

Effects of the Invention As described above, according to the present invention, since the vacuum container and both electrodes are provided symmetrically with respect to the axial center plane when the electrodes are opened, the vacuum container and both electrodes are arranged symmetrically with respect to the center plane in the axial direction. The current distribution state within the capacitor becomes uniform, and good withstand voltage characteristics can be obtained. Further, even if the magnetic field generating member is provided only on either the fixed side or the movable side, since the magnetic member is bonded to the back surface of the electrode, the vertical magnetic field is captured and the cutting ability does not deteriorate. Furthermore, since the bellows is arranged so that it is in direct contrast to the concave part of the metal end plate so that the inner part is high-density, the bellows does not buckle, making it an ideal long-life bellows. be able to.

[Brief explanation of the drawing]

Fig. 1 One example of ``0 true''2472'''10
! FIG. 2 is a longitudinal sectional view showing a conventional vacuum interrupter. 6... Cylindrical body, 4a, 4b... Metal end plate, 5... Vacuum container, 6a, 6b... Recess, 7... Fixed electrode rod, 8... Movable polarized persimmon, 10... Fixed electrode, 11...
- Movable electrode, 18° 19... Magnetic member, 20... Magnetic field generating member, 21... Beq-zu. Figure 1

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 approach and separate from the fixed electrode rod from the other metal end plate is attached with a bellows. In a vacuum interrupter, in which a pair of electrodes that can be freely connected and separated are provided at the inner ends of both electrode rods, the vacuum vessel and the electrodes are placed in the axial center when the electrodes are opened. A magnetic field generating member is provided in at least one of the recesses on the fixed side or the movable side and generates a magnetic field parallel to the arc generated between the electrodes. A magnetic member is bonded to the back surface of the fixed or movable electrode at least on the opposite side to the installation side, and the bellows is provided so as to protrude into the recess of the movable side metal end plate so that the inside thereof is in a high vacuum. vacuum interrupter.