JPS58128615A - 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, and more particularly to a vacuum breaker comprising means for generating an axial magnetic field parallel to an arc at the back of an electrode.

In recent years, by applying an axial magnetic field parallel to the arc, it is possible to disperse the arc on the electrode surface and prevent its local concentration, thereby preventing excessive S- on the electrode. A so-called arc dispersion type (vertical magnetic field type) vacuum breaker with improved performance is known.

In such a vertical magnetic field type vacuum breaker, a pair of electrode rods are driven via an operating device to bring the pair of electrodes into contact with and away from each other on the axis of the vacuum container so that they can be moved relatively toward and away from each other. At the same time, each electrode and the inner end of each electrode rod are connected to a magnetic field generator (which generates an axial magnetic field by changing the axial current flowing through the electrode rod into a loop current centered around the electrode rod). The coil body and the like in a conventional vertical magnetic field type vacuum breaker were provided as shown in FIGS. 1 and 2. That is, in FIG. 1, 1 is one electrode rod,
It is provided so that it can move toward and away from the other electrode rod (both not shown) via an operating device, and has a disk-shaped attachment portion 2a at its inner end, as shown in FIG. radially (
(left and right direction in Figure 1)
From the arms s2b (four in the figure) and the magnetic field generating section 2C curved in an arc shape with the same directionality from the end of each arm 2b toward the end of the adjacent arm 2'b. The coil body 2 is lowered through one of the recesses s3 and 4 recessed on both sides of the mounting 11s2a. Further, at the inner end of the electrode 411, one electrode 5, which is connected and separated in a vacuum container (not shown) in order to input and cut off a large current, is recessed in the center of its back (lower surface in FIG. 1). 1 with both ends fitted into the recess 6 of the coil body 2 and the other recess 4 of the mounting portion 2a of the coil body 2.
1 m cone-shaped lightning bolts are fixed in series via a polar edge support 7. The coil body 2 and the electrode 5 are connected in the axial direction (as shown in FIG. It is connected via the energizing bottle 9 in the vertical direction).

The electrode insulating support 1 prevents the electrode 5 and the electrode rod 1 from being electrically connected directly, and is made of a high-resistance metal such as stainless steel or an insulator.

However, in a vacuum breaker having the above-mentioned coil body 2, etc., when the number of divisions of the magnetic field generating part za of the coil body j is increased, the axial magnetic field generated in inverse proportion to the number of divisions becomes weaker, and the axial magnetic field becomes weaker. On the other hand, if the number of divisions is reduced, the current output of each magnetic field generating section 20 and 9 will increase, and the current carrying capacity will be insufficient especially when the energizing bottle 9 is energized, making its use difficult. This raises the issue of not being able to withstand it.

The present invention has been made in view of the above-mentioned problems, and its object is to provide a vertical magnetic field type vacuum that can cut off large-capacity currents with excellent cutting performance and conduct electricity. Provide a circuit breaker. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings from FIG. 8 onwards.

As shown in FIG. 3, a vacuum breaker 10 according to the present invention has a pair of electrode rods U positioned on the axis of a cylindrical vacuum container 11 so as to be able to approach and separate from each other. , a large current is applied to the inner end of each electrode rod U.

When a pair of electrodes 13 that are brought into contact and separated in order to be cut off are fixed in series with an insulator interposed between them, each electrode rod U and each electrode 13 are connected to each other to prevent the axial current flowing through the electrode rods. It is generally constructed by connecting a coil body 14 disposed on the back of each electrode rib in order to generate a magnetic field in the axial direction (in the vertical direction in Figure 3 of the broom) by changing the current to a loop centered on U.

That is, the vacuum vessel 11 is made of a metal material such as Kovar, in which a plurality (in this embodiment, two) of insulating cylinders IB made of glass or alumina ceramics formed into a cylindrical shape are implanted at both ends of each insulating cylinder IB. One of the thin cylindrical sealing fittings 16, 1g, . . .
, 16, and are hermetically sealed with disk-shaped metal end plates 17, 17, and the inside is evacuated to a high vacuum. Then, inside the vacuum vessel 11, the pair of electrode rods U can approach and separate from each other through a hole 17a provided in the center of each gold wI4 plate 17 while maintaining the gas characteristics of the vacuum vessel 11. It has been introduced.

Note that one electrode rod U (upper in FIG. 3) is hermetically joined to one gold 11 end plate 17,
Is the other straight pole extension U true due to the range bellows 18? ! hole 17 of the other sound range end plate 17 while maintaining the airtightness of the valley device 1]
It is inserted through the tube so as to be freely movable in the axial direction, and is driven back and forth via an operating device (not shown) disposed outside the vacuum container 11.

In addition, in FIG. 3, the main shield is a cylindrical main shield that concentrically surrounds the electrodes u, 13, etc., and the ring disk-shaped support metal sandwiched between the sealing metal fittings 16 on one side is located near the middle part of the main shield. It is supported by Midatsu, and is an auxiliary shield fixed to the inner surface of each metal palanquin end plate 17.

As shown in FIG. 4, at the inner end of the electrode rod 12 on the other side (movable side) of the pass, there is a 1 loaf portion of a bottomed cylindrical intermediate lead body n that constitutes a part of the 11Te coil body 14. 1!2 a
(7) It is fitted through a recess 23 formed in the center of the outer surface (lower surface in FIG. 4) and is firmly fixed by brazing, and this intermediate lead body n is made of high mechanical strength such as austenitic stainless steel. The bottom outer surface of the electrode rod 12 is brazed and reinforced by a ring-disc-shaped reinforcing metal fitting 24K which is made of high-resistance metal and fitted near the inner end of the electrode rod 12. Bottom part 1r of intermediate lead body n
In the center of the inner surface of the 2IL, a four part 5 is recessed in the same way as the outer surface.
A cylindrical electrode insulating support X made of a high-resistance metal or insulator such as austenitic stainless steel is integrally formed with seven flange portions 35a at both ends in order to electrically insulate and support the electrode in series. , are fitted through seven flange portions at one end and fixed by brazing. The electrode (2) is fitted into the 7th flange [) of the electrode insulating support X through a cylindrical portion 13a which is integrally formed near the center of its back and has a smaller diameter than the cylinder @6xb of the intermediate lead body n. The cylindrical portion 13a of the stem 13 is concentrically overlapped with the cylindrical portion gb of the intermediate lead body n in the radial direction (left-right direction in FIG. 4). The cylindrical portion 13 of the electrode 13 and the cylindrical portion 22b of the intermediate lead body n are electrically connected to the magnetic field generator WK, which together with the intermediate lead body 1 constitutes the coil body 14. . The magnetic field generator 1 generates an axial magnetic field by changing the path of the current flowing through it, and as shown in FIGS. 4 and 5, the intermediate lead body ff
The inner circumferential surface of the cylindrical portion x'b in K with the stepped portion X and 11
In order to connect the outer ring part 1a and the inner ring part 7!7b which are mounted on the outer peripheral surface Kl of the cylindrical part 13m in one pole 13 and fixed by brazing, and each ring part W a, 2I b, the circumferential direction is A plurality of spiral-shaped magnetic field generating parts IO (two in this embodiment) are arranged uniformly and with the same directionality, and a plurality of spiral-shaped magnetic field generating parts IO (two in this embodiment) are integrally formed from a conductive plate by karana-shaping, press molding, etc. In this embodiment, two (2) magnetic field generating element bodies are provided so as to be superimposed in the axial direction.

In FIGS. 4 and 5, Δ is a gas vent hole when the electrode insulating support X is brazed to the intermediate lead n, etc., and X is the inner ring W in the magnetic field generator 2yVC.

The cylindrical portion 13 a of the electrode 13 is formed with a notch formed on the inner peripheral edge of the
This is to store the brazing filler metal during bonding.

In addition, the electrode 13 and coil body 14 fixed to the inner end of one (fixed side) electrode rod 12 are similar to the other one described above, so their explanation will be omitted.◎ From the above configuration The vacuum breaker 10 has a pair of electrodes 1 and 13 pressed against an operating device to supply a large amount of current in the same manner as the previous vacuum breaker.
3 is instantaneously separated from one of the electrodes &13 by an operating device to cut off a large amount of current. However, when electricity is applied, the magnetic field generator 14 of the coil body 14 that connects electrode @12 and electrode 13 breaks the path. Since it has a large area and is connected to the electrode violet 2 etc. via the cylindrical portions 13a and 22'b, it will not become unusable due to heat generation or the like. In addition, the magnetic field generating portion N of the magnetic field generating body 1
Since the total current of the axial magnetic field generated by o is divided into two magnetic field generating parts 27c, there is no risk of its strength decreasing, and the cutting ability is also good. .

In addition, in the embodiment described above, the cylindrical portion 13 of the electrode 13
Although the case where the outer diameter of a is smaller than the inner diameter of the cylindrical portion 22b of the intermediate lead body in the coil body 14 has been described, the present invention is not limited to this. The inner diameter is the cylindrical part 22 of the intermediate lead body 4.
It may be formed to have a larger diameter than the outer diameter of b, and the magnetic field generator I may be interposed between the two. Further, the magnetic field generating body I may have one magnetic field generating element, and is not limited to two magnetic field generating units 7 to 7C connecting the outer ring portion 27a and the inner ring portion 1b. The number may be 1 or 311 or more. Furthermore, the magnetic field generating body l is not limited to the case where the magnetic field generating portion ffc is formed in the shape of a spike. For example, as shown in FIG. # - 1 annular magnetic field generator gl+ with radial connection 27
It may also be used as a magnetic field generator l' connected by c'. Further, magnetic field generators; v, 27' are outer ring parts 27a, ffa', inner ring parts; vb, zyb
' and the magnetic field generating parts 27c, ffc' are not limited to being integrally molded, and may be provided integrally by joining each part molded separately, and the magnetic field generating part 27
It is also possible to use only a and ffc' as a magnetic field generator.

FIG. 7 is a longitudinal cross-sectional view of a wall of a second embodiment of the present invention, in which the magnetic field generators i and v in the coil body 14 are
As mentioned above, the strength of the axial magnetic field was improved by making two pieces separated in the axial direction and connecting them in series with a ring-disc-shaped connection conductor π. Since it is different from the first embodiment, it has the same function as the first embodiment! The same reference numerals are used to denote the same members, and the explanation thereof will be omitted.

That is, the ends of the cylindrical portion 13m of the electrode 13 provided with different diameters and the cylindrical portion 22b of the intermediate lead body n in the coil body 14.
are provided spaced apart from the end portions in the axial direction, and the respective cylindrical portions 13a, Mb include magnetic field generators y, , t+y
' is the inner ring part zyb, :vb' or the outer ring part 27
a, j! It is fitted through 7a'. Then, the magnetic field generators 1, 1 fitted into the cylindrical portion 13a of the electrode 13
The outer ring portions 27a and ffa' of the magnetic field generating body y and the inner ring portion yb of y' are fitted into the cylindrical portion zbK of the intermediate lead body n.

yb' is electrically connected to the ring disk-shaped connecting conductor via projecting edges 31 a and 31 b formed on the outer and inner edges of the connecting conductor in different axial directions.

Note that in the second embodiment described above, the rW of the electrode 13
Although the case where the outer diameter of the J part 13a is formed to be smaller than the inner diameter of the cylindrical part 22b of the intermediate lead body 2 is illustrated, the inner diameter of the cylindrical part 13a of the electrode 18 is not limited to kneading.
It may be formed to have a larger diameter than the outer diameter of the cylindrical portion 2b. Further, the magnetic field generators y and 27' may be provided in the same manner as those in the fIIJ1 embodiment described above, but it is sufficient to provide at least one of the outer ring part ffa and the inner ring part ybt. It is.

As described above, in the present invention, a pair of electrode rods are positioned on the axis in a vacuum container and introduced into the bottom which can be moved toward and away from each other, and a rounded cylindrical intermediate portion is attached to the inner end of each electrode rod. The lead bodies are fixed in an X-centered manner with their open ends facing each other, and the cylindrical part and diameter of each intermediate lead body are different from each other.
11 poles each having 11 poles on the back are fixed in series through an electrode insulating support with their respective cylindrical parts superimposed concentrically in the radial direction with the cylindrical parts of each intermediate lead body, and the cylindrical parts of each intermediate lead body are Department and each 111! Since the cylindrical part is connected to the cylindrical part by one or more spiral or one end ring-shaped magnetic field generating body, the capacity of the current flowing can be controlled without causing resistance heat etc. Therefore, the RI vertical magnetic field type vacuum breaker can be made to have excellent current carrying capacity and breaking ability.

Further, a pair of electrode rods are positioned on the axis line and introduced into the vacuum container so as to be able to approach and separate from each other, and a bottomed cylindrical intermediate lead body is attached to the inner end of each electrode rod at each opening. The electrodes are fixed concentrically with their ends facing each other, and have a cylindrical part on the back having a diameter different from that of the cylindrical part of each intermediate lead body. The electrodes are separated from each other in the axial direction and fixed in series through an electrode insulating support.
m1 of the cylindrical portion of each intermediate lead body and each electrode
@w One or more snowsocks (iral shaped or single) with outer ring and/or inner ring.
The magnetic field generators fitted in the cylindrical portion of each intermediate lead body and the magnetic field generators fitted in the cylindrical portions of the respective electrodes are formed into a ring disk shape. Inside W
Since they are connected in series by connecting conductors with 8 edges and 9 holes on the outer periphery, in addition to the above-mentioned effect, the strength of the axial magnetic field can be greatly improved. .

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the conventional vacuum breaker, Fig. 2 is a view taken along the line 1-1, and Fig. 3 is a longitudinal cross-sectional view of the vacuum breaker according to the present invention. Stripe 5 is a vertical cross-sectional view and a plan view of the main part in the first embodiment of the present invention, FIG. 6 is a plan view of another embodiment of the wall portion in the first embodiment, and FIG. 01 which is an IIX cross-sectional view of the lLF section in Example 2]...Vacuum vessel,! 2... Electrode rod, 13.
...Electrode, 131...Cylinder part, n...Intermediate lead body, M
b...Cylinder part, X...Electrode insulating support, W, W'...
・Magnetic field generator, ffa, J7a'...outer ring part, yb, yb'...inner ring part, 2'i
o, 2fa'...Magnetic field generation part, J...Connection conductor, 31a, 31b,...Protrusion. Figure 3

Claims (1)

[Scope of Claims] (1) A pair of electrode rods are positioned on the axis line and introduced into a vacuum container so as to be able to approach and separate from each other, and a cylindrical shape with an end is inserted into the inner end of each electrode rod at the bottom The intermediate lead bodies are fixed concentrically with their open ends facing each other, and electrodes each having a cylindrical part on the back having a diameter different from that of the cylindrical part of each intermediate lead body are attached to each intermediate lead body. The cylindrical portion of each intermediate lead body and the cylindrical portion of each electrode are overlapped concentrically in the radial direction and fixed in series through an electrode insulating support. 1. A vacuum breaker, characterized in that the spiral structure is connected upwardly to one end-shaped annular magnetic field generator. (2) The vacuum breaker according to claim 1, wherein the inner diameter of the cylindrical portion of each intermediate lead body is larger than the outer diameter of the cylindrical portion of each electrode. (3) The vacuum breaker according to claim 1, wherein the outer diameter of the cylindrical portion of each intermediate lead body is formed to be smaller than the inner diameter of the cylindrical portion of each electrode. (4) The vacuum breaker according to Claims 1 to 3, wherein each magnetic field generating body is formed by a plurality of magnetic field generating rods superimposed in the axial direction. (5) Each magnetic field generating body is provided with an outer ring part and an inner ring part that are fitted into the cylinder part of the respective intermediate lead body or the cylinder part of the electrode. The vacuum breaker according to any one of Items 1 to 4. (611 I? A pair of electrode willows are positioned on the axis line and introduced into the container so that they can approach and separate from each other freely, and a bottomed cylindrical intermediate lead body is attached to the inner end of each electrode willow in I! are fixed concentrically with their openings facing each other, and an electrode with a cylindrical part on the back having a diameter different from that of the cylindrical part of each intermediate lead body is connected to the end of each cylindrical part of each intermediate lead body. #1llil! is fixed in series with the end of the cylindrical part in the axial direction via the electrode insulating support, and the outer ring and inner ring are attached to the cylindrical part of each intermediate lead body marked with # and the cylindrical part of each electrode. ,,! One or more spiral-shaped or one end-ring-shaped magnetic field generating body equipped with both or either one of the above-mentioned intermediate lead bodies is fitted into the cylindrical portion of each of the intermediate lead bodies. The magnetic field generating body and the magnetic field generating body fitted into the cylindrical portion of each electrode are formed into a ring disk shape and are connected in series by a connecting conductor having a protruding edge on the inner center edge and the outer circumferential edge. (7) The vacuum breaker according to claim 6, characterized in that the inner diameter of the cylindrical portion of each intermediate lead body is formed to be larger than the outer diameter of the cylindrical portion of each electrode. (8) The vacuum breaker according to claim 6, characterized in that the outer diameter of the cylindrical portion of each intermediate lead body is formed to be smaller than the inner diameter of the cylindrical portion of each electrode. (9) The vacuum breaker according to any one of claims 6 to 8, wherein each magnetic field generating body is formed by a plurality of magnetic field generating elements superimposed in the axial direction.