JPS5951427A - 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]

The present invention relates to a vacuum interrupter, and more particularly to a vacuum interrupter comprising means around an electrode for generating an axial magnetic field parallel to an arc. Conventionally, a vacuum interrupter is provided with means for generating an axial magnetic field (vertical magnetic field) V around an electrode. Usually, the double-opening opening part of the insulating cylinder is closed off from the metal end plate through sealing fittings fixed to both ends of the insulating cylinder, and the inside is evacuated to a high vacuum to form a vacuum vessel V, and a circle is placed inside the vacuum vessel. A pair of plate-shaped electrodes introduced from the center of each metal end plate so that they can approach and separate from each other! Eggplant electrode rod! In addition to mechanically providing mechanical contact and separation (contact and separation), each electrode and its respective electrode rods are connected to the back of each electrode in order to generate an axial magnetic field of the same polarity.

[Arranged in an annular shape with ends or in the circumferential direction 2
Is it a coil that is divided into a ring shape on the moon and has an outer diameter that is almost the same as the electrode and pole? They are electrically connected in series through the two. However, conventional axial magnetic field type vacuum interrupters suffer from arcing caused by separation of electrodes. The axial magnetic field is used to confine the magnetic field in the interelectrode space and stabilize it, which can be increased compared to the radial (horizontal) magnetic field method. Are the arc spots on the electrode surface not scattered near the outer periphery of the electrode, and near or at the center? There is a problem in that the electrode surface is concentrated and unevenly distributed on the concentric circle at the center, making it impossible to effectively utilize the electrode surface. Such a median line generates a magnetic field of the same polarity σ] and is spaced apart by a predetermined distance in the axial direction of the two coils. The results of the experiment in which the radial distribution state of the combined axial rotating magnetic field by both coils was determined by making both the same and making their outer diameters '&f' are the same, as is clear from Figure 1. This is thought to be due to the non-uniformity of the outer distribution in the radial direction. -t that is. In Figure 1, the horizontal axis represents the coil σ) outer diameter R′lX′, the vertical axis represents the strength lfH% of the combined axial magnetic field, and the coil σ) outer diameter R? What is the radial distribution state of the combined axially rotating magnetic field when the magnetic field is changed? , coil outer diameter Rσ】increase θ) order r curve (lA
, B, C, and D, and for meshing with a small outer diameter R, the intensity of the combined axial magnetic field H is shown by curve A. If the coil has a convex shape that is highest at the center 0 of the coil, and the outer diameter R of the coil is large, the curves iWB, C, and D should be 5K.
, the strength H of the composite axial magnetic field is lowest at the center of the coil and highest near the inner circumference of the coil, exhibiting a concave shape, and as the outer diameter R of the coil increases, the lowest and highest points decrease. It can be seen that the composite axial magnetic field, that is, the distribution of the magnetic flux density in the radial direction becomes non-uniform, leading to uneven distribution of arc spots. The present invention was developed based on the above-mentioned features. The purpose of this is to provide a pair of electrodes that can be mechanically brought into contact with and separated from each other in an empty container via a pair of electrode rods.
To generate a concave axial magnetic field on the outer periphery of the pair of electrodes, a cylindrical brush with one or more axial slits (concentric) and one or more axial ribs (concentric) and one or more of the backs of one or the other electrode. A convex shape and a smaller axial magnetic field than the $1 coil? In order to generate a magnetic field of the same polarity, a second annular coil with a diameter smaller than that of the first coil and a larger number of divisions in the circumferential direction is arranged concentrically. % - By electrically connecting one or the other electrode to the electrode, the radial distribution of the combined axial magnetic field from one coil can be made uniform over the entire surface of the chemical pole. A vacuum interrupter V of the axial magnetic field type is used, which aims to uniformly diffuse the arc spot and thereby make effective use of the electrode surface. Below are the drawings from Kaku 2 onwards. Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 is a longitudinal cross-sectional view of the vacuum interrupter according to the present invention.
This vacuum interrupter consists of two cylindrical insulating cylinders 1, 1. yI/, one of the thin circular ring-shaped sealing fittings 2, 2, °°° made of Kovar etc. fixed on both ends? Coaxially joined through

[- and make it into one insulating tube. Both openings? The other sealing fitting 2.2 is closed with a disc-shaped metal end plate 3.3 made of stainless steel or the like, and the inside is evacuated to a high vacuum to form four vacuum vessels. A pair of disk-shaped lightnings 7 with approximately the same outer diameter, poles 5
．． 6 from the center of each metal end plate 3, 3 to the airtightness of the vacuum container 4? A pair of electrode rods 7.8 are held and introduced so as to be able to approach and separate from each other mechanically, as will be described later. A cylindrical first coil 9 having a slit in the vertical direction (in the vertical direction) is arranged concentrically 1, and together with the first coil 9, the magnetic field distribution in the radial direction (in the horizontal direction in Fig. 2) is created between the electrodes 5.6. To ensure uniform size, the back of the fixed side (upper side in the 21st part) electrode 5 has the same diameter as the electrode 5 and the number of divisions in the circumferential direction. An annular second coil 10X (more than the first coil 9) (+/ arranged concentrically with respect to the fixed electrode rod 7Vr, and fixed in place in order to generate an axial magnetic field of the same polarity as the first coil 9 and the second coil 10i) It is electrically connected to the side electrode rod 7 and the stationary side electrode 5. That is, at the inner end of the stationary electrode rod 7, as shown in FIG. Circular protrusion 7a and step 7b
is formed, and the first step part 7bK is made of a ceramic material having an η-opening or a high-resistance metal such as stainless steel, Hastelloy, Inconel, etc., and has a thickness equal to the height of the protruding part 7a. One surface of the disk-shaped spacer 11 is fixed. 5 as shown in FIGS. 3 and 4 on the end surface of the protrusion 7a of the fixed electrode rod 7 and the other surface of the spacer 11. Is the outer diameter appropriately larger than the outer diameter of the electrode rod 7? The coil part 9a has a cylindrical shape and has a slit of 12% in the axial direction. ) The $1 coil 9, which is made up of a connecting arm 9b and a second connecting arm 9c, has a semicircular connection formed at the ends of the first connecting arm 9b and the second connecting arm 9c. The coil part 9a is fixed through the part 1111I, the pole rod 7
It is installed in such a way that it is arranged in series with the other. At the end of the arm 2 connecting arm 9c of the brush 1 coil 9,
Approximately semicircular protrusion 13d and step 13fi%' on one end surface
The formed auxiliary electrode rod 13 is fixed to the fixed electrode rod 71f through the end surface of the protrusion 13fi so as to be arranged in series, and the end of the first connecting arm 9h is coated with an insulating material or a high Made of resistive metal, - face auxiliary electrode rod 1
The other end of the disk-shaped spacer 14 fixed to the stepped portion 13hK of No. 3 is fixed. A circular recess 15 is provided on the other end surface of the auxiliary electrode rod 13, 1l-1rt. A cylindrical spacer 16 having one end or a concave portion 15
It is fixed to the bottom of the box and stored concentrically. Spacer 1
6 and the other end surface of the auxiliary electrode rod 13, there is an electrode connecting portion to, 1 formed in a cylindrical shape with an appropriately smaller diameter than the inner diameter of the recess 15, as shown in FIGS. 3 and 5. , City, Pole Connection 10aO) Four first arm portions iob, 1ob, . . . extending radially outward from positions divided into four equal parts on the outer circumferential surface. Approximately 40 of each @1 @ end of part 10b or f-1 1 coil 9
Four coil parts 10c, 10c, . Four second arm parts 10d extend radially inward in parallel with the first arm part 10b of each frame. 10d, . . . from the end of each second arm portion 10d to the recessed portion 1.
5 and the outer diameter of the auxiliary electrode rod 13. Four electrode rod connection portions 10e110 curved in the same circumferential direction on the inside and outside.
The second coil consisting of e, ... ] 0 is the electrode connection part 1
0fi and each electrode rod connecting portion 1 108 are fixedly connected together. At the other end of the electrode connection part IQq171 in the second coil 10, the fixed electrode 5, which is formed in the shape of a disk and has approximately the same diameter as the second coil 10, is located at the center of its back surface (top surface in FIG. 3). The recess 17 provided in the At the inner end of each magnetic field generating part 1 of the first coil 9 (separated from the LC and fitted in a loop-like manner, and the electrode rod 8σ on the flexible side), the fixed electrode 5 and The movable side electrode 6 is formed into a disk shape with the same diameter,
It is fitted through a recess provided in the center of its back surface (lower surface in Figure 3). In FIG. 2, 19 is a metal bellows, 20 is an intermediate shield concentrically surrounding each electrode 5.6 and the first coil 9, and 21.21 is an auxiliary shield fixed to the inner surface of each metal end plate 3. be. Also, ] In the 2 Brush 3 diagram, 22 is the Brush 2 coil 10'? This is a ring-disc-shaped coil reinforcing member fitted with the auxiliary electrode rod 13Vr for reinforcement and support, and is made of high-resistance metal, etc., and the W and x coils 9 are also reinforced through similar coil reinforcing members (not shown). 23 is a notch provided at the other end of the auxiliary electrode rod 13, so that the first arm portion 10b of the second coil 10 and the auxiliary electrode rod 13 are directly electrically connected. This is to prevent this. The interruption of the main circuit 'llr flow by the vacuum interrupter of the first embodiment with the above configuration is caused by an arc generated between the electrodes 5.6 due to the opening of the electrodes 5.6, or by an arc generated between the electrodes 5.6 and 5.6. This process is completed when the current reaches a natural zero value or close to it and disappears as the current is sufficiently opened.
In addition to taking the axial magnetic field Hv on the vertical axis, both coils 9 and 1
The axial magnetic field curve caused by 0 is 1gAA, 'B
, and the axial magnetic field that combines both axial magnetic fields is expressed as m
'SK, '811 coil 9 is shown in Figure 6, denoted by c.
Since an axial magnetic field of substantially uniform strength is applied in the radial direction by the second coil 10 and the second coil 10, the arc spot is formed on both electrodes 5. It is diffused almost uniformly over the entire surface between the pairs of R. In addition, in the above-mentioned embodiment, @2 coils 10%'
Although we have described the case where it is placed on the back of the fixed side electrode 5,
For example, the movable side electrode 6
It may be placed on the back of the IC, lE1
Similarly, the coil 9 may be electrically connected to the electrode rod 8 and the like on the movable side 4 . In addition, the brush 1 coil 9 is not limited to the so-called one-turn type with 12 slits in the axial direction;
Number of divisions within a range less than the number of divisions of 0? It is good to have more. 11-1, the vacuum container 4 is not limited to the case where it is formed from one insulating cylinder made up of two insulating cylinders 1 and the metal end plate 3.3 that closes both ends of the cylinder; Of course, it may be formed from three or more insulating cylinders and two metal end plates that close both ends of the cylinders, or from a metal cylinder and insulating end plates that close both ends of the cylinders. As described above, the present invention has two electrodes in a vacuum container. A pair introduced so as to be able to approach and separate relatively to each other is mechanically provided so as to be able to be moved toward and away from each other via an electrode rod, and the pair ? A cylindrical first coil having an axial slit on the outer circumference Vr1 or 2N of the electrode is arranged concentrically, and a coil with a diameter smaller than that of the first coil and a circumference is placed on the back of one or the other electrode. A second coil having an annular shape with an increased number of divisions in the direction is arranged, and the first coil and the second coil have the same polarity and are electrically connected to one or the other electrode rod and electrode in order to generate a magnetic field. Since it is connected to a VC, there is a spot of arc that occurs between the electrodes when the circuit is cut off.
It is possible to uniformly diffuse the electric current over the entire surface of the QT surface, which in turn brings about effects such as the ability to efficiently increase the number of new customers.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the distribution state of the axial magnetic field in the radial direction with respect to changes in the outer diameter of the coil, Figure 2 is a vertical cross-sectional view of the vacuum interrupter according to the present invention, and Figure 3 is the main part of the present invention. 4 and 5 are plan views of essential parts of the present invention, respectively, and FIG. 6 is an explanatory diagram of the operation of the present invention. 4...Vacuum container, 5.6...Electrode% 7.8...
Electrode rod, 9°°°@] Coil, 10 pa/2nd coil, 1
2...Slit. 7 Figure 1 Figure 2 7 1 1 ゛. 6 I

Claims (1)

[Scope of Claims] il+ A pair of electrodes introduced into a vacuum container such that they can be moved relatively toward and away from each other. A cylindrical first coil having one or more axial slits on the outer periphery is arranged concentrically, and the back part of either one or the other electrode is an annular coil having a smaller diameter than the coil and having a larger number of circumferential divisions. @2 coils! Place. A vacuum interrupter in which the first coil and the second coil are electrically connected to one or the other electrode and an electrode in order to generate a magnetic field of the same polarity. 1211 is the outer diameter of the second coil.The outer diameter of the first coil is 40~
70%. Vacuum interrupter according to claim 1'qi.