JPH0125468Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a vacuum valve, and particularly to an improvement in electrode structure.

[Technical background of the invention and its problems] A vacuum valve equipped with an electrode that generates an axial magnetic field when energized, that is, a vertical magnetic field electrode, has already been put into practical use, and a typical example is shown in Figure 7. . In the figure, a vacuum container 1 is constructed by closing the openings at both ends of an insulating container 2 with end plates 3a and 3b, and a pair of electrodes 4 and 5 are disposed facing each other in the vacuum container 1. ing. Thus, the electrode 4 is attached to the end of the fixed current-carrying shaft 6 that passes through the end plate 3a, and the other electrode 5 is attached to the end of the movable current-carrying shaft 8 that passes through the end plate 3b via the bellows 7. has been done. Here, the movable energizing shaft 8 is moved in the axial direction by an operation mechanism (not shown) to bring the electrodes 4 and 5 into contact with and away from each other to turn on and cut off the current. Furthermore, by penetrating the end plate 3b via the bellows 7, the movable energizing shaft 8 maintains the airtightness of the vacuum container 1 and is movable in the axial direction.

The shield 9 is provided so as to cover the periphery of the electrodes 4 and 5, and prevents metal vapor generated at the time of current interruption from directly adhering to the insulating container 2 and deteriorating its insulation properties.

As described above, the electrodes 4 and 5 are configured to generate a magnetic field in the axial direction when energized, and their configuration will be explained with reference to FIGS. 8 and 9. Note that the following explanation will be made regarding one electrode 4. The electrode 4 consists of a main electrode 10, a coil electrode 11, and a reinforcing member 12 provided between the main electrode 10 and the coil electrode 11. It is formed from a flange portion 12b that abuts and is fixed to the side surface. In addition, the main electrode 13 and the coil electrode 1 are also connected to the electrode 5.
A similar reinforcing member 15 is provided between 4 and 4.

However, in the above electrode configuration,
Since the reinforcing members 12 and 15 are fixed to the coil electrodes 11 and 14 at the fixed parts 12a and 15a, and also fixed to the main electrodes 10 and 13 at the flange parts 12b and 15b, respectively, a part of the current flowing through the electrodes is transferred to the reinforcing members. 12, 15, coil electrode 1
The current flowing through 1 and 14 decreases by that amount. The coil electrodes 11 and 14 have circular arc portions 11a and 1 that are concentric with the fixed current-carrying shafts 6 and 7 and form a current path in the circumferential direction.
1b, 11c, 11d and 14a, 14b, 1
4c and 14d are provided respectively, and the electrodes 4 and 5 are connected by the current flowing in the circumferential direction through these arcuate portions.
An axial magnetic field is generated between the electrodes 4 and 5 to stabilize the vacuum arc generated between the electrodes 4 and 5, thereby making it possible to interrupt large currents. Therefore, coil electrode 1 of electrode 4
1. When the current flowing through the coil electrode 14 of the electrode 5 decreases, the strength of the magnetic field generated between the electrodes 4 and 5 decreases, resulting in a disadvantage that the stability of the vacuum arc decreases and the breaking performance decreases.

Therefore, in order to compensate for this decrease in interrupting performance, the flange portion 12b of the reinforcing member 12 and the main electrode 10, and the flange portion 15b of the reinforcing member 15 of the electrode 5 and the main electrode 13 are only brought into contact without being fixed. , the current flowing through the reinforcing members 12 and 15 is reduced as much as possible to prevent the current flowing through the coil electrodes 11 and 14 from decreasing, and the strength of the magnetic field generated between the electrodes 4 and 5 is not decreased. .

However, if the reinforcing member 12 and the main electrode 10 and the reinforcing member 15 and the main electrode 13 are not fixed,
Since electrodes 4 and 5 deform when turning on or cutting off,
By increasing the thickness of the coil electrodes 11 and 14, it becomes necessary to increase the mechanical strength, which becomes a factor that hinders the miniaturization of the vacuum valve or the vacuum circuit breaker equipped with this vacuum valve, and furthermore, This was also a factor in raising production costs.

In order to eliminate this drawback, the present inventors proposed an electrode having the structure shown in FIGS. 10 and 11. Note that the following explanation will be made regarding a configuration different from that in FIGS. 8 and 9. A reinforcing member 16 is disposed between the main electrode 10 and the coil electrode 11 on one electrode 4 , the fixed part 16 a is fixed to the coil electrode 11 , and the flange part 16 b is in contact with the main electrode 10 . Further, a reinforcing member 18 is disposed between the main electrode 13 and the coil electrode 14 on the other electrode 5, the fixed part 18a is fixed to the coil electrode 14, and the flange part 18b is in contact with the main electrode 13. Therefore, the flange portions 16b, 1 of the reinforcing members 16, 18
Reinforcement plates 17, 17 are inserted between 8b and coil electrodes 11, 14, respectively. This reinforcing plate 17
are the arcuate portions 11a to 11 of the coil electrodes 11 and 14.
d and has an outer circumference larger than the inner diameter of 14a to 14d, and the fixed parts 16a and 18a of the reinforcing members 16 and 18 pass through the center, and the flange part 16
A hole 17a having a size smaller than the outer diameter of the main electrodes 10, 13 and the coil electrodes 11, 14 is provided on the outer periphery.
0c, 10d and 13a, 13b, 13c, 1
Notches 17b, 17c, 17d corresponding to 3d,
17e is provided. Therefore, the electrode 4,
When an external force in the compressive direction is applied to main electrode 1
0 and 13 are in contact with the reinforcing members 16 and 18, the coil electrodes 11 and 14 are not deformed in the compression direction, and conversely, when an external force in the tensile direction is applied to the electrodes 4 and 5, the coil electrodes 11 and 14 are not deformed in the compression direction. 11 and 14 are in contact with reinforcing plates 17 and 17, respectively, and reinforcing plate 1
Since the coil electrodes 7 and 17 abut against the reinforcing members 16 and 18, respectively, the coil electrodes 11 and 14 are not deformed in the tensile direction.

However, the reinforcing plates 17, 17 are
6, 18 and the coil electrodes 11, 14 respectively, the distance between the main electrode 10 and the coil electrode 11, and between the main electrode 13 and the coil electrode 14 increases by the thickness of the reinforcing plates 17, 17, respectively, and the electrode 4,
5 to reduce the strength of the magnetic field generated during this period. Therefore, in order to compensate for the decrease in magnetic field strength, the diameter of the electrode must be increased, and an improvement has been desired.

[Purpose of the invention] An object of the invention is to provide a vacuum valve that is compact and has improved shutoff performance by preventing mechanical deformation of electrodes.

[Summary of the invention] This invention is a vacuum valve in which a pair of electrodes, each of which has a coil electrode on the back surface of the main electrode that generates a magnetic field in the axial direction when energized, is disposed in a vacuum vessel so that the main electrode can be moved toward and away from the main electrode. A first reinforcing member that abuts the main electrode is fixed to the coil electrode between the electrode and the coil electrode, and a second reinforcing member that abuts the first reinforcing member is disposed in a recess formed in the coil electrode. By doing so, it is possible to improve the interrupting performance and mechanical strength without increasing the axial dimension of the electrode.

[Embodiment of the invention] An embodiment of the vacuum valve of the invention will be described above with reference to the drawings. Note that the same parts as in FIGS. 7 to 11 are designated by the same reference numerals, and the description thereof will be omitted. 1st
2 and 3, one electrode 2
1 is a main electrode 10, a coil electrode 23, and a reinforcing member 16
and a reinforcing plate 17. Further, the other electrode 22 is also composed of the main electrode 13, the reinforcing member 18, and the reinforcing plate 17. Therefore, the coil electrode 23 has substantially the same configuration as the coil electrode 11,
Arc parts 23a, 23b, 23c, and 23d are provided that are concentric with the fixed current-carrying shaft 6 and have current paths in the circumferential direction, and a reinforcing plate 17 is provided on the surface facing the main electrode 10.
A recess 23e (the area other than the outer periphery is indicated by a dashed line in FIG. 3) having a diameter appropriately larger than the outer diameter of the recess 23e is provided, and the reinforcing plate 17 is inserted into this recess 23e. Here, the recessed portion 23e is the connection portion 10a, 10 with the main electrode 10.
Provided except for b, 10c, and 10d.

The coil electrode 24 has substantially the same configuration as the coil electrode 14, and is provided with arcuate portions 24a, 24b, 24c, and 24d that are concentric with the movable current-carrying shaft 8 and have current paths in the circumferential direction, and also face the main electrode 13. A recess 24 having a diameter appropriately larger than the outer diameter of the reinforcing plate 17 is formed on the surface.
e is provided, and the reinforcing plate 17 is inserted into this recess 24e. Here, the recess 24e is the connecting portion 1 of the main electrode 13.
3a, 13b, 13c, and 13d are provided.

Therefore, the arc portion 2 of both coil electrodes 23 and 24
The electrodes 21 and 2 are caused by the current flowing through 3a to 24d.
An axial magnetic field is generated between the electrodes 21 and 22.
This stabilizes the vacuum arc that occurs between the two, making it possible to interrupt large currents.

Furthermore, when a compressive force is applied to the electrodes 21 and 22, the main electrodes 10 and 13
Since they are in contact with each other, there is no deformation in the compression direction. Further, when a force in the tensile direction is applied to the electrodes 21 and 22, the coil electrodes 23 and 24 abut on the reinforcing plates 17 and 17, respectively, and the reinforcing plate 1
7 and 17 abut against the reinforcing members 16 and 18, respectively, so that they do not deform in the tensile direction.

Further, the reinforcing plates 17, 17 are connected to the coil electrodes 23, 2.
4, it is not necessary to increase the distance between the main electrode 10 and the coil electrode 23, and between the main electrode 13 and the coil electrode 24. In other words, the axial dimension of the main electrodes 21 and 22 can be increased. There's no need to.

In addition, in the above-described embodiment, the reinforcing plates 17, 17
is made into a flat shape, and the flat reinforcing plates 17, 17 are inserted into the coil electrodes 23, 24.
As another embodiment, the reinforcing plate 25 may be folded into steps as shown in FIGS. 4, 5, and 6. That is, the reinforcing plate 25 has the reinforcing member 16 in the center,
A hole 2 through which the fixed portions 16a and 18a of No. 18 pass through and whose size is smaller than the outer diameter of the flange portions 16b and 18b.
5a, a circular part 25b having a diameter suitably larger than the outer diameter of the reinforcing members 16 and 18 is formed on the center side, and a stepped circular part 25c is formed on the outside of this circular part 25b. , 13 connecting parts 10a, 10b, 10c, 10d and 13
Notches 25d, 25e, 25f, and 25g are provided corresponding to a, 13b, 13c, and 13d, respectively. In addition, the coil electrodes 26 and 27, which are formed in substantially the same manner as the coil electrodes 23 and 24, have reinforcing plates 25 on the surfaces facing the main electrodes 10 and 13, respectively.
Recesses 26a and 27a (other than the outer periphery are indicated by dashed lines in FIG. 6) having diameters appropriately larger than the diameter of the circular portion 25C are provided, respectively.
Similar effects can be obtained by inserting reinforcing plates 25, 25 into 6a, 27a. 26 in Figure 6
b, 26c, 26d, 26e and 27b, 27
C, 27d, and 27e are circular arc portions provided on the coil electrodes 26 and 27, respectively, so as to form a current path in the circumferential direction.

[Effects of the invention] Since the present invention is configured as described above,
Breaking performance and mechanical strength can be improved without increasing the axial dimension or diameter of the electrode.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the vacuum valve of the present invention, Fig. 2 is a sectional view showing the configuration of an electrode of an embodiment of the invention, and Fig. 3 is taken along line A-A in Fig. 2. 4 is a sectional view showing the structure of the electrode of the present invention that is different from that in FIG. 3; FIG. 5 is a plan view of the reinforcing plate shown in FIG. 4; 6
The figure is a plan view with the reinforcing plate omitted as seen along line A-A in Figure 4 in the direction of the arrow, Figure 7 is a sectional view showing a conventional vacuum valve, and Figure 8 is a configuration of the electrodes of a conventional vacuum valve. FIG. 9 is a plan view with the reinforcing plate omitted as seen along line A-A in FIG. 8 in the direction of the arrow.
FIG. 0 is a cross-sectional view showing the configuration of the electrodes of a conventional vacuum valve, which is different from FIG. 8, and FIG. 11 is a plan view of the reinforcing plate shown in FIG. 10. DESCRIPTION OF SYMBOLS 1... Vacuum container, 6... Fixed current-carrying shaft, 8... Movable current-carrying shaft, 10, 13... Main electrode, 16, 18...
...Reinforcement member, 17, 25...Reinforcement plate, 21, 22
... Electrode, 23, 24, 26, 27 ... Coil electrode, 23e, 24e, 26a, 27a ... Recessed portion.

Claims (1)

[Scope of utility model registration request] In a vacuum valve in which a pair of electrodes including a coil electrode that generates an axial magnetic field when energized is disposed in a vacuum container on the back side of a main electrode so as to be able to come and go, between the main electrode and the coil electrode, a first reinforcing member having one end in contact with the back surface of the main electrode and the other end fixed in a recess formed in the front surface of the coil electrode;
One end of the first reinforcing member is brought into contact with a surface opposite to the surface that is in contact with the back surface of the main electrode, and the other end is fixed to the outer periphery of the fixed portion of the first reinforcing member in the recess of the coil electrode. A vacuum valve comprising a second reinforcing member.