JPH04160716A - Vacuum bulb - Google Patents

Abstract

PURPOSE:To improve breaking performance without-lowering electrifying performance to be caused by limitation of a current passage at the time of electrification and cut-off by providing a slit in the side surface of a cup-shape electrode so that a magnetic field is generated in the same direction with a magnetic field to be generated by a spiral electrode at the time of cutoff. CONSTITUTION:A fixed electrode 5 consists of a nearly disc-shape electrode member 18 having a contact point 12 at the center thereof, and slits are provided in this electrode member 18 so that the current flowing in the electrode 18 at the time of cut-off of the current is limited by these slits. In a movable electrode 6, a cup-shape electrode member 19 is fitted to the upper part of an electrifying shaft 8, and an electrode 13 is provided so as to seal an opening of the cup of the electrode member 19, and slit-shape grooves 21 are provided in the electrode member 19 in the same direction with the slits of the electrode member 18 so that the direction of the current flowing in the electrode member is continuous. Breaking performance is thereby improved by providing slits in the side surface of the cup-shape electrode 19 so that a magnetic field is generated in the same direction with a magnetic field to be generated by the spiral electrode 18 at the time of cut-off.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a vacuum valve with excellent large current interrupting performance.

(Prior Art) Conventionally, a vacuum valve for cutting off a large current is known, for example, as disclosed in Japanese Patent Application Laid-Open No. 59-3831. As shown in FIG. 4, the structure of this vacuum valve consists of a vacuum container 4 formed by airtightly sealing the openings at both ends of an insulating cylinder 1 with end plates 2 and 3, and a pair of vacuum containers inside the vacuum container 4, which can be freely moved in and out. electrodes 5.6 are arranged. The fixed energizing shaft 7 of the electrode 5 is fixed to the end plate 2 and removed, and the movable energizing shaft 8 of the electrode 6 is movably attached to the end plate 3 via a bellows 9. An arc shield 10 surrounding the electrodes 5 and 6 is attached to the insulating cylinder 1, and a bellows cover 11 is attached to the movable current-carrying shaft 8.

Further, the structure of the electrodes 5 and 6 includes electrode bodies 14 and 15, and a coil electrode 16.17 electrically connected to the back surface of the electrode body by a current-carrying portion 168.17a. The current flowing through the coil electrodes 16,17 generates an axial magnetic field. This axial magnetic field uniformly spreads the arc ignited between the contacts and minimizes damage to the contacts, making it possible to interrupt larger currents than with flat plate electrodes or spiral electrodes.

(Problems to be Solved by the Invention) Conventional vacuum valves require a magnetic field generating electrode behind the arc electrode in order to generate a vertical magnetic field, and the resistance value is low due to the long current path of the magnetic field generating electrode. becomes high and current carrying performance deteriorates.

An object of the present invention is to provide a vacuum valve that improves cutoff performance without reducing current carrying performance.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention includes a pair of current-carrying shafts led out from inside the vacuum container, and a pair of current-carrying shafts that are connected to the tips of the current-carrying shafts within the vacuum container. In a vacuum valve equipped with a pair of electrodes each having a contact part that is fixedly installed and can be freely connected and separated, one of the pair of electrodes is electrically connected to the tip of a current-carrying shaft and is energized from the top of the current-carrying shaft. One spiral electrode has a spiral slit that is led out radially around the axis and is bent in the direction of the lead out, and the other has an opening that houses the arc electrode on the contact/disconnection side.A spiral electrode is generated when the circuit is cut off. A cup-shaped electrode with a slit on the side surface is provided so that a magnetic field is generated in the same direction as the magnetic field.

(Function) In the device configured as described above, a slit is provided on the side surface of the cup-shaped electrode so that a magnetic field is generated in the same direction as the magnetic field generated by the spiral electrode at the time of interruption, so that the interruption performance is improved. .

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a vacuum valve of the present invention.

Note that since the components other than the electrodes are the same as those of the conventional vacuum valve, the same numbers are given and explanations are omitted.

2 and 3 are structural diagrams of a fixed electrode and a movable electrode of the vacuum valve of FIG. 1.

The structure of the fixed electrode 5 is composed of an approximately disk-shaped electrode body 18 having a contact point 12 at the center.

This electrode body 18 is provided with a slit 20 as shown in FIG. 2, and the current flowing through the electrode 18 when the current is interrupted is limited by this slit.

This effect will be described later. As for the movable electrode 6, as shown in FIG.
3 is provided. The electrode body 19 has a slit-like groove 21.
The direction of this slit is the same as that of the slit 20, and the direction of the current flowing through the electrode body is continuous.

Next, the effect will be explained.

During energization, the movable electrode, that is, the electrode body 19, is brought into contact with the electrode 18 by an operation mechanism (not shown), and the current is passed through the fixed energizing shaft 7, the contact 12, the electrode 13, the electrode body 19, and the movable energizing shaft 8. The current flows in the order of , does not pass through the coil electrode twice as in the conventional case, and the current conduction performance does not deteriorate due to resistance during current conduction. When the current is cut off, the contact 12 and electrode 13 are separated by the action of an external operating mechanism and an arc is generated. At this time, a longitudinal magnetic field generated due to the action of the current path limited by the slit 21 provided in the electrode body 19 is applied to the arc between the electrodes. Due to this vertical magnetic field, the arc generated near the contact point gradually begins to spread and reaches the electrode 18. At this time, electrode 1
Since the electrode 8 also has the slit 20, the current path is restricted through the electrode 18, so that a current flows in the same direction as the current flowing through the electrode 19. In other words, the same longitudinal magnetic field generated in the electrode body 19 is also generated in the electrode 18 and applied to the arc. This vertical magnetic field appears during the cutoff operation, but does not occur during the energization because no current flows through the electrode 18.

Adjustment of the magnetic field strength to be applied to the arc is performed using the electrode body 19.
The shape of the slit 21 of and the slit 20 of the electrode 18,
This is possible depending on the number of pieces. Furthermore, there is no increase in current-carrying resistance when trying to strengthen the magnetic field as in the conventional case, and it is possible to supply the longitudinal magnetic field necessary for interruption. Note that the effects of this embodiment can be expected even if the structures of the fixed electrode and the movable electrode are reversed (that is, the movable electrode is shown in FIG. 2, and the fixed electrode is shown in FIG. 3).

[Effects of the Invention] As described above, the present invention has a slit on the side surface of the cup-shaped electrode so that a magnetic field is generated in the same direction as the magnetic field generated by the spiral electrode when cut off, so that the current path is maintained both when energizing and when cutting off. By limiting , the interrupting performance can be improved without deteriorating the current carrying performance.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a vacuum valve of the present invention, FIGS. 2 and 3 are configuration diagrams of electrodes of the vacuum valve of FIG. 1, and FIG. 4 is a configuration diagram of a conventional vacuum valve. 5...Fixed electrode 6...Movable electrode 12...Contact 18...Electrode 19...・・・・・・Electrode body 20・・・・・・・・・Slit 21・・・・・・・・・Slit-shaped groove Agent Patent attorney Kensuke Chika No. 1 Figure 3

Claims (1)

[Scope of Claims] A pair of current-carrying shafts led out from the inside of the vacuum container to the outside, and a pair of electrodes each having a contact portion that is fixedly attached to the tip of the current-carrying shaft within the vacuum container and that can be moved into and out of the vacuum container. In the vacuum valve equipped with the above-mentioned vacuum valve, one of the pair of electrodes is electrically connected to the tip of the current-carrying shaft, and is led out from the top of the current-carrying shaft radially around the current-carrying shaft, and further extends in the leading direction. A spiral electrode has a spiral-shaped slit that bends on the other side, and the other side has an opening for accommodating an arc electrode on the connecting/separating part side, so that a magnetic field is generated in the same direction as the magnetic field generated by the spiral electrode when disconnecting. A vacuum valve characterized by having a cup-shaped electrode with a slit on the side.