JPS5954133A - Vacuum bulb - 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 [Technical Field of the Invention] The present invention relates to a vacuum valve used as a vacuum breaker, and particularly to a device for retaining the electrodes of this vacuum valve.

[Technical background of the invention]

Generally, this type of vacuum valve utilizes the insulating and arc-extinguishing properties of vacuum to cut off current by separating both electrodes in a high vacuum of about 10 Tbrr or less. . However, when large current interruption is required, it is not enough to simply utilize the arc extinguishing function of the vacuum valve; it is also necessary to consider the surface condition of the electrode.

In other words, the metal vapor source generated by normal vacuum arc generation is
Although only at the cathode spot, when a large current is cut off, the arc column contracts and local current injection into the electrode surface causes υ,
An anode point is formed on the anode surface, and a large amount of metal vapor (metal mist) is generated from this anode point as well. For this reason, even after the current reaches zero point, a large amount of metal vapor remains between the two electrodes, so the configuration of the anode point greatly affects the shutoff function of the vacuum knob.

Therefore, various electrode structures have been proposed to prevent the vacuum arc from concentrating locally, but all of these structures utilize the interaction between the magnetic field and the vacuum arc. It is.

That is, in order to prevent concentrated arcs in vacuum pulp, (1) a magnetic field is applied perpendicularly to the arc column generated between the two electrodes to drive the arc, and this arc is caused to touch a part of the electrodes. (2) A means for applying a magnetic field parallel to the arc column generated between the two electrodes to uniformly disperse the arc over the entire electrode as a stable microcolumn and ignite the arc. There is. All of these prevent local concentration and stagnation of the arc and are effectively utilized on the electrode surface. Among the electrode structures for generating these magnetic fields, the former is a spiral electrode,
The latter is also called a longitudinal magnetic field electrode.

By the way, in the above-mentioned spiral electrode, at the beginning of electrode separation, the arc concentrates at the center contact part and the current does not flow through the spiral blade part, so no magnetic field is generated, and on the other hand, the large current area If the arc becomes uncoupled (- or disconnected), it may become difficult to obtain a strong magnetic field that can sufficiently drive the arc. Therefore, a vacuum pulp using an electrode called a cusp-type electrode has been proposed.

That is, FIGS. 1 to 4 show vacuum pulp using the above cusp type electrode, and a vacuum container l in this vacuum pulp.
A fixed side end plate 3 and a movable side end plate 4 are provided at the openings at both ends of an insulating cylindrical body 2 to form a vacuum cabin 5. On the inside of this vacuum vessel 1, A shield member 6 is provided. Further, a fixed electrode (2) is vertically provided on the fixed side end plate 3, and a movable electrode (2) is raised and lowered via a metal bellows 7 on the movable side end plate 4 located directly below the fixed electrode (2). It is set freely.

The movable electrode (2) to be incorporated into the vacuum pulp has a conductor arm 9 attached to the end of the electrode rod 8 so as to receive the magnetic field as shown in FIGS. 3 and 4.
An arcuate coil conductor 10 is integrally attached to the outer end of the conductor arm 9, an insulating plate 11 is attached to the end face of the conductor arm 9, and A ring plate-shaped electrode 12 is attached to the end face so as to be electrically connected to the coil conductor 10.

On the other hand, the fixed electrode work incorporated in the vacuum pulp is the second
As shown in the figure, a conductor arm rod 14 is attached to the end of the electrode rod 13.
An arcuate coil conductor 15 is integrally attached to the outer end of the conductor arm 14, an insulating plate 16'4 is attached to the end face of the conductor arm 14, and an insulating plate 16' is attached to the end face of the conductor arm 14. An annular plate-shaped electrode 17'4 is attached to the end face of the coil conductor 15 so as to be electrically connected to the coil conductor 15. That is, the fixed electrode structure is configured to have the same shape and size as the movable electrode I.

Therefore, when the pole r1 I separates both cusp-shaped electrodes,
The cutoff current flows from the electrode rod 8 to the conductor arm 9 to the conductor coil 10 to the electrode 12 of the movable electrode I, and then from this electrode 12 to the electrode 17 of the fixed electrode I, the conductor coil 15, and the conductor arm 14.
- It flows along the path of the electrode rod 13.

On the other hand, the currents flowing through both conductor coils 10 and 15 are in opposite directions, and the composite magnetic field B (see Figure 2) between the two electrodes is directed outward from the center of the arc column 18 electrode. Since both conductor coils 10 and 15' are configured to cross each other, the arc is driven in the circumferential direction of both electrodes due to the interaction between the arc and the magnetic field, and the arc does not stagnate in one place. Local melting of the electrode is prevented. In addition, by changing the shape of the conductor coil 10.15, the magnitude of the driving force can be changed, so there is no shortage of driving force, and furthermore, since both electrodes 12.17 form a ring plate shape, The arc always crosses the magnetic field from ignition to extinguishment, so that the driving magnetic field can be used effectively.

[Problems with background technology]

However, in the cusp-type vacuum pulp described above, the magnetic field generated by both conductor coils 10.15 is
Although it is effectively used for the purpose of driving the arc between 2.17 and 2.17, the overall magnetic field forms a confinement magnetic field, as shown in Figure 2, so a part of the arc plasma enters the magnetic field A. This confined plasma becomes trapped in the central part of both electrodes 12 and 17 and the conductor arm 9.
．． 14, conductive path other than the arc column of both electrodes!
Due to this, the current flowing through the conductor coil 10.15Z decreases, making it impossible to obtain the desired generated magnetic field.
The center part of both the electrodes 12.17 and the conductor arm rod 9.1
4 is provided with an insulating plate 11.16 on the end face of the conductor coil 10.15, thereby preventing arc plasma from adhering to the center portions of both conductor coils 10.15 and both conductor arm rods 9.14. It is difficult to completely suppress gas release during heating due to adhesion.

[Purpose of the invention]

The present invention has been devised in view of the above-mentioned circumstances, and provides a reliable vacuum valve that eliminates the confinement Z of arc plasma and has stable shutoff performance.

[Summary of the invention]

The present invention provides a vacuum valve in which a pair of electrode rods that are separated from each other are provided in a vacuum container, in which conductor arm rods are provided at both ends of the electrode rods, and the ends of the conductor rods are arranged in opposite directions. Each conductor coil 'Y that generates a magnetic field is integrally provided, each insulating plate is attached to the end face of the above-mentioned conductor arm rod and the end face of each above-mentioned conductor coil, and each electrode is attached to the end plate of each insulating plate! It is constructed by attaching a metal plate that is thinner than both the electrodes to the end face of each insulating plate that is attached to the conductor coil so as to be electrically conductive and located on the inner side of both the electrodes.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an illustrated embodiment. Note that the present invention will be described with the same reference numerals assigned to the same constituent members as those in the above-described specific example.

1, 5 to 8, reference numeral 1 denotes a vacuum container forming a vacuum cabin 5, and this vacuum container l
is composed of a fixed side end plate 3 and four movable side end plates provided at both end openings of an insulating cylindrical body 2, and a shield member 6 is disposed inside the vacuum vessel l. .

Further, a fixed electrode is installed vertically on the fixed end plate 3, and a movable electrode I is installed on the movable end plate 4 directly below the fixed electrode.
is provided so that it can be raised and lowered via a metal bellows 7. Further, the fixed electrode assembly and the movable electrode I incorporated in the vacuum tube are constructed to have the same shape and size, and the movable electrode part has an electrode structure as shown in FIGS. 5 to 8. A conductor arm rod 9 is provided horizontally at the end of the rod 8, and an arc-shaped coil conductor'& is integrally attached to the outer end of the conductor arm 9, and on the end surface of the conductor arm 9, for example, An insulating plate 11 made of alumina magnetic ceramics is attached, and a ring plate-shaped electrode 12 is attached to the end face of the insulating plate 11 so as to be electrically conductive to the coil conductor 10. A disk-shaped metal plate 20Y, which is thinner than the electrode 12, is attached. In particular, this metal tentative title is fixed by each stop pin 21 having a flange 21m through each small hole 19 formed in an oval shape in the insulating plate 11. The reason for this is that the insulating plate 11 and the metal material undergo different thermal expansions, so each of the oval small holes 19 relieves shear stress.

On the other hand, the fixed electrode I incorporated in the vacuum valve is constructed in the same manner as the movable electrode (2).

That is, as shown in FIGS. 5 to 8, the fixed electrode I is provided horizontally with a conductor arm 14 at the end of the electrode rod 13, and an arc-shaped Z is provided at the outer end of the conductor arm 14. An insulating plate 16 made of, for example, alumina magnetic ceramics is attached to the end face of the conductor arm 14, and a circular plate-shaped electrode 1 is attached to the end face of the insulating plate 16.
Seven pieces are attached to the coil conductor 15 so as to be electrically conductive,
At the center of the end face of the insulating plate 16, a disk-shaped metal plate 20, which is thinner than the electrode 17, is inserted through each oval small hole 19 with each stopper pin 2] having a flange 2]a. It is firmly fixed.

Therefore, when the movable electrode I is separated from the fixed electrode 1 of the cusp-shaped electrode, the cutoff current flows from the electrode rod 8, the conductor arm rod 9, and the conductor coil 10 of the movable electrode 1 to the pole 12, and from this electrode 12. The flow follows a path Z: electrode 17 of fixed electrode (1) - conductor coil 15 - conductor arm rod 14 - electrode rod 13.

On the other hand, the above-mentioned fixed electrode work and movable type &I metal tentative titles are:
It is possible to completely suppress gas release during heating due to the adhesion of arc plasma, and by providing both metal plates 20, it is possible to prevent current from flowing to the center and to stably cut it off. It has become.

Next, the embodiment shown in FIG. 9 is another embodiment of the present invention, in which a gap 22 is formed between the insulating plate 11.16 and the metal plate bonded thereto. As a result, metal vapor (mist) appears on the back of the above Kinmen tentative title.
This is intended to improve insulation efficiency by preventing the adhesion of .

〔Effect of the invention〕

As described above, the present invention provides vacuum pulp in which a pair of electrode rods 8.137 are provided in a vacuum container 1 and are separated, and each conductor arm rod 9.14 is provided at both ends of both electrode rods 8.13. , conductor coils 10.15 that generate magnetic fields in mutually opposite directions are integrally provided at the end of each conductor arm 9.14, and the end face of the conductor arm 9.14 and the conductor coil 10.15 are integrally provided.
Each insulating plate 11, i6'& is attached to the end face of the insulating plate 11. However, inside both the electrodes 12 and 17 (11) η... air gap.

Both the electrodes 1 are placed on the end faces of the insulating plates 11 and 16.
2.Since it is attached with a metal plate 20'Y thinner than 17,
It is not only possible to prevent the current from flowing to the center, but also to stably cut it off, and at the same time, it is possible to improve the reliability of the vacuum pulp.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the vacuum pulp that has already been proposed, Fig. 2 is an enlarged side view showing the relationship between the fixed electrode and the movable electrode of the vacuum pulp, and Fig. 3 is a cross-sectional view of the movable electrode. ,
FIG. 4 is a plan view of the same as above, FIG. 5 is a sectional view showing essential parts of the vacuum pulp according to the present invention, FIG.
The drawings are an enlarged sectional view of the chain circle A section in FIG. 5, FIG. 8 is a plan view of the same, and FIG. 9 is a diagram showing another embodiment of the present invention. l...Vacuum container, 8...Electrode rod, 9...Conductor arm rod, 10...Conductor coil, 11...Insulating plate, 12...
・Electrode, 13... Electrode rod, 14... Conductor arm rod, 15
... Conductor coil, 16 ... Insulating plate, 17 ... Electrode, 19 ... Small hole, processing ... Metal plate, 21 ... Bin, (12)

Claims (1)

[Scope of Claims] 1. A vacuum valve provided with a pair of electrical rods that are separated in a vacuum container, each conductor arm rod is provided at both ends of the electrode rods, and the end portion of each conductor arm rod is provided with a Conductor coils that generate magnetic fields in opposite directions are integrally provided, insulating plates are attached to the end faces of the conductor arm rod and the end faces of the conductor coils, and further,
Each electrode is attached to the end face of each of the insulating plates so as to be electrically conductive to each of the above-mentioned conductor coils, and a metal plate thinner than both of the above electrodes is attached to the end face of each of the above-mentioned insulating plates located on the inside of both the above-mentioned electrodes. A vacuum valve characterized by: 2. The vacuum valve according to claim 1, wherein a gap is formed between the two insulating plates and the metal plate bonded thereto.