JPS6193524A - Vacuum interrupter - 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 Field of the Invention The present invention relates to vacuum interrupters, and more particularly to vacuum interrupters with electrodes made of materials that are difficult to braze.

A prior art vacuum interrupter generally has the configuration shown in FIG. That is, both ends of the insulating cylinder l are coated with gold 11I4.
The end plate is opened at 3 to create a vacuum container, and inside the vacuum container, the fixed side and nj! i! I7 side's outrage”
” s≠b is attached to the tips of the lead rods J and j.Furthermore, the lead rod on the fixed side is fixed to pass through the end plate λ airtightly, and the lead i4 on the moving side is fixed. ! is provided to airtightly penetrate the end plate 3 via the bellows 6. 7 is a shield.

In the vacuum interrupter mentioned above, the fixed electrode In and the movable electrode 4tb, which are arranged opposite to each other in the vacuum container, have high conductivity, welding resistance, wear resistance, low-frequency cut-off current characteristics, 'fd voltage characteristics, etc. It is also necessary to sufficiently satisfy the required breaking performance.

In order to meet the above conditions, a variety of electrode (contact materials) have been developed and developed, but it is also important to know how to connect electrodes made of these materials to lead rods. However, the conventional methods for joining an electrode to a lead rod include brazing the electrode directly to the lead rod, or brazing the electrode to another member (auxiliary member) that has been fixed to the lead rod in advance. A common method is to braze the electrodes.

but,! The shell of the ball is made of the following alloys or metals containing additives, and therefore has poor brazing properties and poor bonding strength.

1. Items with additives that exceed the solid solubility limit with the matrix (typical examples include Tsuzano (1) and (2)) Those with high vapor pressure components (e.g. parent phase is Cu*Ags, additive is Bi,
Pb, Te, Se, 5n) t2) Those containing Cr to improve withstand voltage characteristics (e.g., Cu-Cr) 2. Those containing fR compounds, carbides, and nitrogen compounds (e.g., Cu Crl Os) Problems to be Solved In the above, when an electrode is made of a metal such as l-113, additives such as Bi seep out onto the surface of the solder due to heating during the soldering process, and the metal is absorbed through these additives. However, since this additive is extremely brittle, there is a problem that the electrode and lead rod may peel off at the wax surface during use. Further, in any of the above 1.2% electrodes, the wettability with the brazing material was poor, and it was difficult to braze firmly.

Conventionally, when it comes to electrode materials that are difficult to braze, as shown in Figure 4, brazing and PIAm-like bonding methods using caulking have been used in combination. (For example, Utsukai 8+1350-11606
(See No. 0). That is, in FIG. 4, the daytime electrode is attached to IJ-domain #j. In the same figure (in the case of al, a truncated conical groove is provided on the joint surface of the electrode, and a lead rod j is placed on the n)
A ring-shaped protrusion i provided at the tip of.

Brazing material! The electrode member is fixed to the lead rod by press-fitting it through a, caulking it, and then brazing it.

In addition, in Fig. 3 tb), a concave part /l is provided at the tip of the lead rod J, and a joint seat 13 with a small diameter part /- is provided at the tip of the lead rod J. After fitting into the recess // through the brazing material a, the ring-shaped protrusion l is caulked to the small diameter part lλ, and then brazed to lead the 11L cylindrical part #! It is in a solid layer. However, since the methods shown in Figures 4 (al and bl) above all involve mechanical joining by caulking, the contacts may be damaged during use while mechanical stress is applied to the caulked portion. There is also the problem that the contacts and lead rods fall off.There is also the disadvantage that complicated machining must be performed on the contacts and lead rods for caulking.

The present invention solves the above-mentioned drawbacks, and the first invention is a vacuum interrupter having an electrode inside the lead rod.
The electrode is formed of a contact and an auxiliary fitting arranged to cover the periphery of the contact, the auxiliary fitting is brazed to the lead rod side, and a non-brazed part is formed between the brazed part and the contact. do.

Furthermore, the second invention includes an auxiliary fitting arranged to handle the electrode and the area around the contact, and an arc K arranged at the back of the contact.
m, the auxiliary fitting is brazed to the arc tm, and a non-brazed part is formed between the brazed part and the contact point.

Therefore, in the electrode of the vacuum interrupter,
The contact can be bonded and fixed to the inner end of the lead rod via an auxiliary metal fitting or an arc electrode without directly brazing.

EXAMPLES Below, the invention will be described with reference to the embodiments shown in FIG. 2(a) = (dl) and FIG.

First, the first invention will be explained based on FIGS.

FIG. 2 181 shows an Ml-containing embodiment, in which the contact point r
In addition, the lead rod is made by the arc 11L 悌/ja, which also serves as a fixed auxiliary metal fitting! is fixed at the tip of the That is, the arc pole/ja has an M1 hole in the center.

2nd hole/7. The diameter of the third hole 16 is gradually reduced, and the lead rod is inserted into the first hole. The tips of the two are fitted, and the solder is fixed at the soldering part -0.

On the other hand, a bulge r& is formed at the base of the contact l,
The swollen portion ra is inserted into the second hole 17 of the arc electrode/ja.
Along with positioning it inside the lead rod! The contact point r is fitted into the third hole /A, and the tip part is slightly protruded outward.

Therefore, the contact j is connected to the arc electrode /ja via its bulge ra! The contact point r can be connected to the arc electrode l without any direct soldering. Lead the stick! No matter what you do, it will be fixed to the wire and will not fall off.Moreover, a non-brazed portion 〇 is formed between the brazed portion 〇 and the bulged portion ra of the contact point t. Therefore, due to the existence of this non-brazed portion≠O, the heat of the brazed portion J does not reach the contact point r.

FIG. 2 (bl indicates the second embodiment, and compared with the first embodiment, the contact point, the cross-sectional shape of the arc electrode isb, and the lead rod j
The shape of the tip is slightly different.

That is, the arc electrode /jb has a first hole 3 in its center.
1, the second hole J, and the third tapered hole 33 are provided in stages, and on the other hand, the lead rod! A stepped portion J6 is formed at the tip of the wavy portion 36t-, and the first hole 3 of the arc electrode/jb!
and is fitted into the second hole 3≠ and sealed with solder at the brazed portion O.

(10,000, the contact l should be configured to have a trapezoidal cross section that widens from the base end), and the tapered part of this contact t should be connected to the third point of the arc electrode /jb.
In addition to being disposed inside the tapered hole 33, the joint surface it is placed against the tip end surface of the lead rod j, and the tip portion slightly protrudes from the third tapered hole 33.

Therefore, in this second embodiment as well, the contact t is not directly brazed through the tapered part of the contact t.
Series lead rod to arc tA/-tb! It can be fixed to the tip of the brazing part, 20 and the contact point. Since there is a non-brazed portion 20 between the soldered portion 20 and the soldered portion 20, the heat of the soldered portion 20 does not reach the contact point rl.

FIG. 2 (cl indicates the third embodiment, this third embodiment is
Lead stick! A mounting bracket 31 is fixed to the tip of the recess by brazing, and a protrusion 3λ is formed on the upper surface of the mounting bracket 31. - 10,000, l, C is an arc electrode as an auxiliary fitting for the contact leg, and this is a flat disc-shaped 2? A first hole 30 with a large diameter and a second hole with a small diameter are provided in the upper part.
The holes are formed in stages. Then, the contact r is fitted into the second hole of the arc electrode/jc, and is made to protrude a little from this, and the bulging part ra is fitted into the first hole 30, and this first hole JOVc is fitted into the second hole of the arc electrode/jc. The protruding portion of the metal fitting 31 is lowered and placed against the bottom surface of the bulging portion fa. Then, the upper outer peripheral surface of the mounting bracket 31 and the arc 'dj, 41J
The auxiliary metal fitting 31 and the electric screw 7/jc are fixedly connected by the test brazing part O, with the part a in contact with the lower surface of the reed as the brazing part O. Therefore, in this third embodiment as well, the contact l is not directly brazed, but is connected to the lead rod through the mounting bracket 3) and the arc. You can do even more. In this third disaster example, there is also a non-brazed portion 20 between the brazed portion Q and the bulge ra of the contact t, so the heat of the brazed portion 20 is transferred to the contact j. It doesn't get across.

Fig. 2 (dl indicates the 4th example). This 4th example is particularly different from the 1st, 2nd, and 3rd examples.
This is the shape of the arc electrode/jd. That is, 1st. Second
．． Arc electrodes /ja, /jb, /j in the third embodiment
c has the function of pressing the contact point r toward the lead rod j and the function of diffusing the arc, and has a diameter and thickness suitable for smooth arc diffusion, whereas this arc!
a/jd has only the function of pressing the contact point.

Therefore, the contact point t has a bulge Ira, and the bulge J&
Atsushi 1. is fitted inside the large-diameter hole 37 of the arc electric mis'i, and the contact t protrudes from the small-diameter hole 3t. Second.
This is the same as the third example. Furthermore, the tip of the lead rod is fitted inside the outer peripheral part of the arc electrode /jd, and the lead +$j and the arc electrode /jd are fixed at the brazed part λO. Also, since there is a non-brazed portion 〇 between the brazed portion 〇 and the contact point ra, the heat of the brazed portion 〇 is not transferred to the contact j.

Next, the second invention will be explained based on one embodiment shown in FIG.

In the second invention, the arc is pole/re-ride rod! Fixed by brazing to the tip of the auxiliary metal fitting 2! Contact point t using
The arc% pole/! eK is solidified. That is,
Arc%m/! e has a recess 3 on its back,
Fit the tip of the lead rod into the recess 3, and then remove the recess 3 and insert the lead rod! The outer periphery is secured by brazing.

Further, a recessed portion λ is provided on the front side of the arc electrode /je, and an annular ring 3 is bored in the acid portion of the recessed portion λ.

Then, apply the joint surface /r of the bulge ♂3 of the contact point t to the low N-2 hole of the concave portion 22 on the previous day, and press the auxiliary metal fitting! It is held down using In other words, auxiliary metal fittings! has an annular portion 2ja and a top portion 21b, and a hole λ6 into which a contact ♂ can be fitted is formed in the top portion -jb.

And the annular part λ of the auxiliary fitting λ! a so that it fits closely with the inner circumferential line of the two recesses, and the annular part a! Place the edge -7 of a into the groove 3 at the bottom of the recess. Besides, the contact point t is the auxiliary metal fitting 2! The swollen portion ra is fitted into the hole λ6 of the auxiliary metal fitting λ6 and protrudes a little from the hole λ6, and the swollen portion ra is connected to the presser foot by the auxiliary metal fitting λj, and then the auxiliary metal fitting 2! The annular part λ! a outer periphery and arc electrode/! The brazed portion is located between the inner peripheral surface of the recess 22 of e.
be in the same layer by With this, the υ contact r is the auxiliary metal fitting λ! The arc electrode was pushed by /! There is no escape from E. Furthermore, since a non-brazed portion is formed between the brazed portion 20 and the contact point t, the existence of this falsely brazed portion prevents the heat from the brazed portion -0 from reaching the contact point l. .

According to the first invention, the vacuum interrupter is formed of a contact and an auxiliary metal fitting placed around the contact, and the auxiliary metal fitting is brazed to the lead rod. A non-brazed part is formed between the part and the contact, and the contact can be fixed to the inner end of the lead rod without being directly brazed, so additives will not leak out due to heating during brazing. This makes it possible to reliably fix contacts made of materials with loose brazing to the lead rod, which may cause damage to the solder.
The bonding strength of the contacts is significantly the same as above, the number of times the contacts can be opened and closed is increased, and there is no need to process the lead rods or contacts into complicated shapes), and workability is also improved.

Further, according to the second invention, in addition to the effects of the first invention, the auxiliary metal fitting can be buried in the arc '6L pole, so that there is a sufficiently wide space between the brazing part and the contact point, and a curved non-contact. A brazed part can be formed, and the brazed part can be reliably prevented from using a material such as Bi, so that reliable introduction can be carried out.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the vacuum interrupter, Figure 2 is a cross-sectional view of the vacuum interrupter.
, te 1 mouth d) is a front view showing the fifth to fourth embodiments of tolerance according to the first invention, FIG. 3 is a front view showing the embodiment of the second invention, and FIG. 4 (at The following are cross-sectional views showing two examples in which the contact point τ is fixed to the lead culm by the conventional mechanical feeding BF stage by caulking. contact, ta
...Bulge, /Ja, /Jb...Arc T! pole =
! ... Auxiliary fittings, 31... Mounting fittings, 40° → 15. S., - Guu μ Dedicated (a) Figure 3 Figure 4 (b)

Claims (2)

[Claims] (1) In a vacuum interrupter equipped with an electrode at the inner end of the lead rod, the electrode is formed of a contact and an auxiliary metal fitting placed so as to cover the periphery of the contact, and the auxiliary metal fitting is brazed to the lead rod,
A vacuum interrupter characterized in that a non-brazed portion is formed between a brazed portion and a contact point. (2) In a vacuum interrupter equipped with an electrode at the inner end of the lead rod, the electrode is formed of a contact, an auxiliary metal fitting placed around the contact, and an arc electrode placed on the back of the contact, and the auxiliary metal fitting is soldered to the arc electrode. A vacuum interrupter characterized in that a non-brazed portion is formed between the brazed portion and the contact point.