JPH07220588A - Vacuum valve - Google Patents

Abstract

PURPOSE:To provide a vacuum valve having excellent current-carrying performance and disconnection performance. CONSTITUTION:A coil electrode has an electrode base 8, and an arc part provided along an outer form of the electrode base 8, and current-carrying members 7a-7d having connection parts 7a2-7d2 to be connected to the electrode base 8 are disposed like a ring. The adjacent current-carrying members, that is 7a and 7d, for example, are disposed to face each other in the axial direction of the electrode having a specified gap between each other.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to vacuum valves.

[0002]

2. Description of the Related Art FIG. 5 shows a typical constitution of an electrode portion of a vacuum valve using a coil electrode for generating a magnetic field parallel to an arc when breaking. In the figure, an electrode 1 includes a main electrode 2, a coil electrode 3 provided on the back surface thereof, and a main electrode 2
The reinforcing member 4 is provided between the coil electrode 3 and the coil electrode 3. Here, the coil electrode 3 has a central connecting portion 3a fixed to the energizing shaft 5, an arm portion 3b extending from the central connecting portion 3a toward the outer periphery, and a circular arc shape concentric with the energizing shaft 5 from its tip. Circumferential arc portion 3 extending to form a current path
c and a connecting protrusion 3d for electrically connecting to the main electrode 2 are provided. In such a configuration, a magnetic field parallel to the arc (hereinafter referred to as an axial magnetic field) is generated between the electrodes facing each other based on the current in the circumferential direction flowing through each outer circumferential arc portion 3c, and the vacuum generated between the electrodes. It stabilizes the arc and makes it possible to interrupt large currents.

[0003]

However, in such a structure of the electrode 1 of the vacuum valve, the current path is from the current-carrying shaft 5 to the central connecting portion 3a of the coil electrode 3 to the arm portion 3b.
-Outer peripheral circular arc portion 3c-It becomes a path to the main electrode 2 through the connecting projection portion 3d. On the other hand, as shown in FIG. 6, the intensity distribution of the magnetic field generated in the intermediate portion of the gap between the pair of electrodes is the maximum on the central axis of the electrode and gradually decreases toward the periphery. Here, the distribution of the magnetic field has a width in the vertical direction due to the fluctuation in the circumferential direction.

Further, when the magnetic field distribution on the outer circumferential arc portion 3c of the coil electrode 3 is plotted against the angle in the circumferential direction, FIG.
become that way. In this case, the magnetic field distribution corresponding to the electrodes in FIG. 5 is shown. Since the arm portion of the coil is divided into four, the arm portion of one electrode is used as a reference and 0 to 90 degrees are displayed. There is. The remaining magnetic field distribution from 90 to 360 degrees repeats this. Such a variation in the magnetic field strength is caused by the fact that the arc-shaped current does not form a perfect ring because no current flows in the gap between the connection protrusion 3d and the arm 3b in the current path. It occurs due to two causes of the influence of the current flowing through the arm portion 3b.

The width of the fluctuation of the magnetic field strength also changes depending on the positional relationship in the circumferential direction of the opposing electrodes. It is known that the distribution of the strength of the magnetic field affects the current interruption capability.In order to maintain the arc generated between the electrodes during current interruption stable, the distribution of the magnetic field strength is generally It is desirable that there is little fluctuation. Also, in order to obtain stable cutoff performance, it is desirable to manufacture a vacuum valve with the magnetic field distribution always the same, but in the conventional electrode example, the position of the pair of electrodes facing each other in the circumferential direction is controlled. It is necessary to manufacture it by the above-mentioned method, which causes an increase in parts cost and manufacturing cost due to position management in the manufacturing process and positioning by parts.

Moreover, with such an electrode, it is difficult to increase the current-carrying capacity without lowering the breaking performance. One possible method of increasing the current carrying capacity is to increase the current carrying cross-sectional area of the outer circumferential arc portion 3c of the coil electrode 3 or the arm portion 3d to reduce the current carrying resistance. The electric current is moved away from between the electrodes, which causes a decrease in the magnetic field strength generated between the electrodes. In addition, the effective area of the axial magnetic field decreases due to the smaller radius of the current in the arc direction. Any of these causes a reduction in the blocking performance.

As another method of increasing the current carrying capacity, it is conceivable to increase the number of arms of the coil electrode 3, but the arc-shaped current value decreases in inverse proportion to the number of arms, and the adjacent electrodes are adjacent to each other. The gaps in the arms increase, and the lack of arc-shaped current reduces the magnetic field strength, which lowers the breaking performance. An object of the present invention is to provide a vacuum valve excellent in energization performance and interruption performance.

[0008]

In order to achieve the above object, the present invention is directed to a vacuum container, a pair of electrodes arranged so as to come in contact with and separate from the vacuum container, and a back portion of at least one of the pair of electrodes. In the vacuum valve provided with a coil electrode for generating an axial magnetic field between the electrodes, the coil electrode has an electrode base and an arc portion along the outer shape of the electrode base, and one end of which is connected to the electrode base. And the adjacent ones are arranged so as to face each other in the axial direction of the electrode while having a predetermined gap.

[0009]

In such a structure, a plurality of conduction electrons are arranged in a ring shape and adjacent conduction electrons are overlapped with each other in the axial direction of the electrode, so that the current of the arc component flows without being partially interrupted. It is possible to prevent the magnetic field strength from decreasing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. However, the same parts as the conventional ones are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a side view of an electrode portion of a vacuum valve of the present invention, FIG. 2 is one exploded perspective view of FIG. 1, and FIG. 3 is a configuration diagram of a conduction member 7a of FIG. In these figures, 2 is a main electrode, 6 is a coil electrode, and 7a.
7d is a conducting electron, 5 is a current-carrying shaft, 8 is an electrode base, 9 is a reinforcing member, and the coil electrode 6 is a conducting member 7a to 7d and an electrode base 8.
Have. The conducting electrons 7a to 7d are formed in an arc shape along the outer periphery of the electrode base 8, and have connecting portions 7a1 to 7d1 and 7a2 to 7d2 at both ends, which are connected to the main electrode 2 and the electrode base 8, respectively. The energizing shaft 5 is connected to the electrode base 8, and the reinforcing member 9 is inserted and connected between the electrode base 8 and the main electrode 2.

On the other hand, the conducting member 7a has connecting portions 7a1 and 7a2 provided at both ends, an upper arc portion 7a3, and a lower arc portion 7a.
4 and. The upper arc portion 7d3 of the adjacent conduction electron 7d is disposed above the lower arc portion 7a4, and the lower arc portion 7b4 of the adjacent conduction electron 7b is disposed below the upper arc portion 7a3 so as to face each other with a predetermined gap. There is. The same applies to other communication devices.

In such a structure, the current flowing from the current-carrying shaft 5 through the electrode base 8 is a current of an arc component that divides the current into the current-carrying electrons 7a to 7d to generate an axial magnetic field, and flows into the main electrode 2. . Here, since the conduction electrons 7a to 7d are arranged to face each other so as to overlap the conduction electrons adjacent to each other, the arc-shaped current component is not partially interrupted. Further, the current path has one or more turns due to the overlapping portions of the conduction electrons, so that a larger number of turns can be obtained and the magnetic field strength can be increased as compared with the current path using the conventional coil electrode.

As described above, according to the present embodiment, the arc component of the electric current for generating the axial magnetic field is not partially interrupted, so that the fluctuation of the intensity in the circumferential direction is small as shown in FIG. A uniform magnetic field distribution can be obtained. Further, since the number of turns of the arc component of the current can be made larger than that of the conventional longitudinal magnetic field electrode, the magnetic field strength can be increased. Therefore, the breaking performance can be improved.

Even when the conduction cross section of the conduction of the coil electrode is increased to reduce the conduction resistance in order to increase the conduction capacity, the required number of turns is larger than that of the conventional longitudinal magnetic field electrode. Directional magnetic field strength is easily obtained, and it is easy to increase the current-carrying capacity without lowering the breaking performance. Further, in the present embodiment, each of the communication electrons 7a to 7d.
As can be seen from FIG. 3, it is not possible to take a short path, so that adjacent arm parts can be made to overlap vertically, which does not cause non-uniformity of the magnetic field distribution and lowers the breaking performance. There is no.

The present invention is not limited to this embodiment, and the number of conducting electrons may be two or more, for example. Further, in the conduction electron, the upper circular arc portion, the lower circular arc portion, and the connecting portion may be separately configured and connected, or may be formed in an inclined shape without providing a step portion between the upper circular arc portion and the lower circular arc portion. Good.

Further, as in the present embodiment, instead of insulating the respective conduction electrons through the gaps, it is also possible to use an insulation or coat the conduction surface with an insulation. Various reinforcements may be provided to maintain the gap even through the gap.

On the other hand, if a slit is provided in the radial direction on the electrode base 8 in order to prevent the generation of an eddy current caused by the fluctuation of the axial magnetic field due to the alternating current, the performance can be further improved.

[0018]

As described above, according to the present invention, the vacuum container, the pair of electrodes disposed so as to come in contact with and separate from the vacuum container, and the back of at least one of the pair of electrodes are connected to each other, and between the electrodes. In a vacuum valve including a coil electrode that generates an axial magnetic field, the coil electrode includes an electrode base and a plurality of electrons having an arc portion along the outer shape of the electrode base and one end of which is connected to the electrode base. Since the energizing electrons are arranged in a ring shape and the adjoining energizing electrons are opposed to each other in the axial direction of the electrode with a predetermined gap, it is possible to obtain a vacuum valve having excellent energizing performance and interruption performance. it can.

[Brief description of drawings]

FIG. 1 is a side view of an electrode portion of a vacuum valve showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is a perspective view of a conduction electron 7a of FIG. 2;

FIG. 4 is a diagram showing an intensity distribution of a magnetic field generated by an electrode portion of the vacuum valve of FIG.

FIG. 5 is an exploded perspective view of an electrode portion of a typical vacuum valve.

FIG. 6 is a diagram for explaining the intensity distribution of a magnetic field generated by the electrode portion of the vacuum valve of FIG. 5;

FIG. 7 is a diagram for explaining the intensity distribution of a magnetic field generated by the electrode portion of the vacuum valve of FIG.

[Explanation of symbols]

2 ... Main electrode, 6 ... Coil electrode, 7a-7d ... Electron, 8
… Electrode stand.

Claims (2)

[Claims] 1. A coil which is connected to a vacuum container, a pair of electrodes arranged so as to be able to come into contact with and separated from the vacuum container, and at least a back part of the pair of electrodes, and which generates an axial magnetic field between the electrodes. In a vacuum valve provided with an electrode, the coil electrode has an electrode base and a plurality of electrons having an arc portion along the outer shape of the electrode base and having one end connected to the electrode base. A vacuum valve characterized in that conducting electrons are arranged in a ring shape, and adjacent conducting electrons are opposed to each other in the axial direction of the electrode with a predetermined gap. 2. The electrode base of the coil electrode is provided with a slit in the radial direction of the electrode.
Vacuum valve as described.