JPS585931A - Vacuum breaker - 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 breaker that can generate a large current by uniformly discharging an arc under the absence of a magnetic field. Regarding the vacuum breaker that made this possible.

Conventionally, in order to make it possible to interrupt a large current by uniformly discharging an arc in the absence of a magnetic field, a vacuum container was formed by sealing both ends of an insulating cylinder with metal end plates, and the inside of the vacuum container was A pair of 11L electrode rods were introduced so as to be able to approach and separate from each other so as to be located on the axis, and a pair of 11L electrodes were installed so that each electrode and each electrode rod could be moved toward and away from each other. A so-called red array type vacuum interrupter is known in which a plurality of concentrically surrounding axial ronds are appropriately spaced apart from each other in the circumferential direction and are alternately attached to opposite metal end plates Km. However, with the rod array type vacuum chamber WIRIll+, arc discharge occurs in the circumferential direction at adjacent rond junctions, so although it is possible to interrupt a large current of approximately 10 times more, the arc discharges at the end of the rond. To prevent it from occurring in a concentrated manner, close each
Since * is tapered to have a large diameter and the m section is formed into a substantially hemispherical shape, there are problems such as a large number of shears being required to make the rod Oa+, making it uneconomical.

The present invention has been made in view of the above-mentioned problems, and the object thereof is to provide a large-current device equipped with a discharge electrode for arc discharge, which can be easily manufactured and which can further improve the cutting speed by 1 kt. Learn more about the embodiments of this invention! Kl! I will clarify.

FIG. 1 is a longitudinal section TM111 of the vacuum interrupter according to the present invention. In the figure, 1 generally indicates the vacuum spring, and inorganic materials such as glass or ceramics! When the 92 insulating tubes 2t are formed into a cylindrical shape and are coaxially joined through the sealing metal 43t implanted at both ends of each of the 92 insulating tubes 2t to form one insulating tube. It is formed by airtightly closing the end plate 4t through a metal end plate 4t and evacuating the inside to a high vacuum. Inside the vacuum chamber, the stationary electrode rod 5 passes through the center of one (upper side in the first EIIC) metal end plate 4 so as to be located on its axis. ! A movable *otii rod 6, which is fixedly introduced into the electrode rod 5 and moved toward and away from the electrode rod 5 by an operating device (not shown), connects the center of the metal end plate 4 via a bellows 7 while maintaining airtightness. A pair of electrodes 8 and 9 are provided at the inner ends of each of the electrode rods 5 and 6, which are brought into contact and separated (contacted and separated) by the movement of the movable electrode rod 6. installed.

Inside the vacuum vessel 1, there is a cylindrical first tube with each electrode rod 5.6 and electrodes 8, 9 arranged concentrically.
Discharge electrodes W, 11 are arranged facing each other. Each of the first discharge electrodes 10 and 11 is used to perform arc discharge in the radial direction under no magnetic field in conjunction with a second discharge discharge electrode, which will be described later. It is mechanically and electrically connected and fixed to the inner surface, and is formed into a double cylindrical shape made of nine plates, with the end curved outward in an arc shape and parallel to the base side.夛、1ls1osL of each.

Between the outer parts 11a and the outer parts 10b and 11b, there is an insulating cylinder n made of an inorganic insulator to prevent short circuits between the two parts.

13 are interposed.

In addition, each first discharge electrode 10 p n o outer part 1011
, 11bKFi, as shown in Fig. 2, a plurality of sulins (10c, 10) parallel to the axis of the vacuum vessel 1 are provided extending near the curved part in order to force uniformity of the arc. In addition, each insulating cylinder 12 and 13 is appropriately attached to the inner surface of each metal end plate 4.

Further, inside the vacuum vessel l, the second #11 discharge electrodes 10 and 11 are concentrically surrounded.
A discharge electrode 14 is arranged. The second discharge electrode 14 is
When the intermediate outer side is sandwiched between the sealing metals A3 and 3 that join the two insulating cylinders 2 to form the vacuum vessel IYt, both ends are curved inward and extend parallel to the vicinity of the intermediate portion. It is formed into a double cylindrical shape made of nine thin plates facing each other,
Between the inner part 141 and the outer part 14b, each $I11 11""@10
, 11, an insulator 115 made of a heat insulating material is interposed, which is supported by the mounting fittings 3, 3 through a support member (not shown) to prevent a short circuit between the two connections. As shown in FIG. 3, the inner part 141 of the second discharge electrode 14 has slits lQ c , 11 c of each of the first discharge electrodes 10 , 11 .
A plurality of slins (140) facing each other and parallel to the axis are provided extending over the curve 11K.

Note that each of the first discharge electrodes 10, 11 and the second discharge electrode 14 (D slits IQa, Lla, 14c are 7-
/It is not necessary in a place where discharge is performed uniformly. 9. In FIG. 1, 16 is a rounded flexible lead wire that connects the other metal end plate 4 and the outer end of the movable electrode rod 60, and 17 is a rounded flexible lead wire that connects the vacuum vessel 1. This is a 1" seal placed around the outer periphery of the falling discharge electrode 14 in order to prevent the inner surface of each insulating cylinder 2 from being contaminated by metal vapor.

With the above configuration, in order to interrupt the state in which the stain electrodes 8 and 9 are in contact and a large current is being applied, move the movable electrode rod 6t (see Figure 1) downward via the operating device. Electrode 8
, 9 are released. Electricity 4g.

9, an initial arc is generated between the two, and the metal vapor etc. diffused into the vacuum vessel 1 is triggered by this, and the outer part 10 of each of the first discharge electrodes 10 and 110 is
m), arc discharge is performed between llb and the inner part 14& of the second discharge electrode 14, and the arc energization ga, the movable electrode rod 6, one metal end plate 4, one 0S111IK electric electrode 10, The second discharge electrode 14, the other first discharge electrode @ 11
, the other metal end plate 4, the flexible lead wire 16, and the movable electrode rod 6. And the first discharge electrode 10
, 11 and the second discharge electrode 14, the initial arc between the electrodes 8 and 9 disappears immediately. This is because the arc discharge between the first discharge electrodes 10, 11 and the second discharge electrode 14 is performed over the entire circumference, and the sum of the arc voltage is equal to the initial arc generated between the electrodes 8, 9. This is because p is much lower than the arc voltage. Then, the movable electrode rod 6 is separated from the fixed electrode rod 5 as shown in FIG. The interruption of the large current is completed by the spontaneous extinction of the discharge arc between the two.

As described above, the present invention connects both ends of the insulating tube to metal end plates! ! is closed to form a vacuum vessel, and a pair of electrodes can be freely moved toward and away from each other through a pair of electrode rods that are introduced into the vacuum vessel so as to be able to move toward and away from each other so as to be positioned on the axis of the vacuum vessel. A cylindrical first discharge electrode whose base is fixed to each metal end plate and whose southern part is curved outward and extends parallel to the base side is installed in the vacuum container marked #, and each electrode rod is connected to the first discharge electrode. The cylinders are arranged facing each other so as to surround each other concentrically, and have an intermediate part supported by an insulating cylinder in the vacuum container, and have opposite ends curved inwardly and extending parallel to each other near the intermediate part. Since the shaped second discharge electrodes are arranged so as to concentrically surround the respective first discharge electrodes, the discharge electrodes can be easily manufactured by press working, and the arc Since the discharge occurs over the entire circumference, it is possible to further increase the interruption capacity.

[Brief explanation of drawings]

FIG. 1 is an enlarged vertical sectional view of the vacuum interrupter according to the present invention, 2nd W
Figures A and #I3 are respectively cutaway cross-sectional views of the mourning part of the present invention. 1--Vacuum container, 2--Insulating tube, 4--Metal end plate,
5゜6... Electrode rod, 8, 9... Electrode, 10, 11-
- 1st discharge electrode, 14-... 2nd discharge electrode. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A vacuum vessel is formed by airtightly closing both ends of an insulating cylinder with metal end plates, and a pair of electrode rods are introduced into the vacuum vessel so as to be positioned on the axis of the vacuum vessel so as to be able to approach and separate from each other. A pair of electrodes are provided in the vacuum container so as to be able to come and go, and the base is fixed to each metal end plate, and the end is bent outward and extends parallel to the base side. The first discharge electrodes Iik are arranged facing each other so as to concentrically surround the respective electrode rods, and the middle part is supported by an insulating cylinder in the vacuum vessel, and both ends S are curved inwardly, and the middle part is supported by an insulating tube. A vacuum interrupter characterized in that the vacuum interrupter is arranged so as to extend parallel to the vicinity of the part, face each other, and surround the part in a cylindrical shape.