JP2015103415A - Vacuum valve and vacuum circuit breaker mounted with the vacuum valve thereon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum valve which can be easily manufactured.SOLUTION: L-shaped first engaging parts 6c, 7c are provided on the outer edges of coils 6, 12, step-shaped second engaging parts 7e, 13e are provided on the outer edges of contacts 7, 13, and the first engaging part 6c, 7c and the second engaging parts 7e, 13e are fitted to each other before being brazed, thereby causing a fitting state between the coils 6, 12 and the contact 7, 13 to be maintained even if a brazing material in a preceding process is melted in a plurality of brazing process during manufacturing.

Description

The present invention relates to the shape of an electrode of a vacuum valve.

In general, for example, the joining between components constituting a vacuum valve provided in a vacuum circuit breaker or the like uses brazing in a furnace using silver brazing in a non-oxidizing atmosphere. As a manufacturing procedure of such a vacuum valve, first, a fixed side electrode and a movable side electrode are manufactured. The fixed side electrode is composed of a fixed side contact, a fixed side coil, a fixed side electrode rod, and a fixed side end plate. The movable side electrode is a movable side contact, a movable side coil, a movable side electrode rod, a bellows cover, a bellows, and a movable side end. Consists of plates. For example, irregularities and holes are formed in the component parts of each electrode, and these are fitted coaxially, and the brazing material disposed between the parts is melted and solidified to be joined by partial brazing. Next, each of the partially brazed electrodes and the insulating container are assembled, the brazing material disposed between each electrode and the insulating container is melted and solidified, and finally brazed and joined.

In the brazing joining as described above, when the same brazing material is used in the partial brazing process for joining the components constituting each electrode and the final brazing process for joining the assembled electrodes and the insulating container, In the brazing process, the brazing material used during the partial brazing process may be remelted. At this time, if the vacuum valve is disposed vertically in the axial direction and brazed and joined, the contact disposed on the upper side is dropped or inclined.

In the conventional vacuum valve, in order to prevent contact inclination and dropping during the final brazing process, an annular groove having a bottom extending radially outward is provided on the surface to be joined to the contact coil, and the groove is provided in the coil. The protruding portion is inserted and pressurized, and the protruding portion is crimped along the groove shape (for example, refer to the prior art document 1).

JP-A-9-274836

In the conventional vacuum valve described above, it is difficult to process the groove shape provided in the contact, and the time required for processing is particularly long in the case of a hard contact. In addition, the tools used for processing are easily consumed, resulting in high manufacturing costs.

The present invention has been made to solve the above-mentioned problems, and is intended to obtain a vacuum valve that suppresses the tilting and dropping of the contact during the final brazing process, is inexpensive, and has good assembly workability. Objective.

  The present invention is provided with an insulating container having a fixed side end plate and a movable side end plate fixed to both ends, a fixed side electrode rod fixed to the fixed side end plate, and a movable side end plate that can be moved forward and backward. In a vacuum valve having a movable electrode rod, a coil provided at each of the opposing ends of each electrode rod, and a contact provided respectively on the opposing side of each of the coils, a first engaging portion is provided at an outer edge of each of the coils. A second engagement portion is provided at the outer edge of each contact, and the first engagement portion and the second engagement portion are fitted by rotating either one of the coils or each contact. It is characterized by a point.

In the present invention, the shape of the coil and the contact can be easily processed, and either one of the coil and the contact is joined to be turned and fitted so that the contact is dropped or inclined in the final brazing process. Therefore, it is possible to obtain a vacuum valve that is inexpensive and has good assembly workability.

2 is a cross-sectional view of the vacuum valve according to Embodiment 1. FIG. 3 is a cross-sectional view of a fixed electrode of the vacuum valve according to Embodiment 1. FIG. 3 is a cross-sectional view of a movable electrode of the vacuum valve according to Embodiment 1. FIG. 3 is a perspective view of electrode components of the vacuum valve according to Embodiment 1. FIG. It is a perspective view in the middle of the assembly of the contact and coil of the vacuum valve of Embodiment 1. FIG. 3 is a perspective view of the vacuum valve contact and coil assembly state of the first embodiment. FIG. 3 is an enlarged cross-sectional view of a contact point of the vacuum valve according to Embodiment 1 and an engaging portion of a coil. 2 is a perspective view of a contact point of the vacuum valve according to Embodiment 1. FIG. It is a perspective view which shows the crimping | crimping part of the contact and coil of the vacuum valve of Embodiment 1. 6 is an enlarged cross-sectional view of an electrode portion of a vacuum valve according to Embodiment 2. FIG. 6 is a perspective view of electrode components of a vacuum valve according to Embodiment 2. FIG. It is an expanded sectional view of the contact part of the vacuum valve of Embodiment 2, and the engaging part of a coil. It is a perspective view of the contact of the vacuum valve of Embodiment 2.

Embodiment 1 FIG.
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. 1 is a cross-sectional view of a vacuum valve according to the first embodiment, FIG. 2 is a cross-sectional view of a fixed electrode, FIG. 3 is a cross-sectional view of a movable electrode, FIG. 4 is an electrode component diagram, and FIGS. FIG. 7 is an enlarged cross-sectional view of the contact and coil engaging portion, FIG. 8 is a perspective view of the contact, and FIG. 9 is a view showing the contact and the coil. In addition, the same code | symbol in a figure has shown the same or an equivalent part.

As shown in FIG. 1, the vacuum valve 100 according to the first embodiment has a cylindrical insulating container 1 made of ceramic. Inside the insulating container 1, a fixed-side electrode 2 shown in FIG. 2 and a movable shown in FIG. A side electrode 3 is provided. The fixed-side electrode 2 includes a fixed-side end plate 4 that covers one end of the opening of the insulating container 1, a fixed-side electrode rod 5 that is supported and fixed through the fixed-side end plate 4, and a tip of the fixed-side electrode rod 5. The fixed side coil 6 is joined, and the fixed side contact 7 is joined to the fixed side coil 6. The movable side electrode 3 includes a movable side end plate 8 that covers the other end of the opening of the insulating container 1, a movable side electrode rod 9 that passes through the movable side end plate 8, and is movable back and forth, and a movable side end plate 8. A bellows-like bellows 10 whose one end is joined to the bellows 10, a bellows cover 11 provided between the movable electrode rod 9 and the bellows 10, a movable coil 12 joined to the tip of the movable electrode rod 9, The movable side contact 13 is joined to the movable side coil 12. The movable side end plate 8 has a guide mounting plate 15 to which a guide 14 for guiding the movement of the movable side electrode rod 9 is mounted. Further, in order to prevent the metal vapor from being scattered from the fixed side and movable side contacts 7 and 13 due to the arc generated when the short-circuit current is interrupted, the inner surface of the insulating container 1 is soiled and the insulating performance is deteriorated. Is provided with a shield 16. Note that a brazing material of a ring-shaped foil is disposed between the components, and brazing is performed by melting and solidifying the brazing material.

As shown in FIG. 4, the fixed side and movable side coils 6 and 12 are respectively provided at arm portions 6a and 12a extending in the radial direction, arc portions 6b and 12b extending in the circumferential direction and generating an axial magnetic field, and vacuum at the outer edges. Three L-shaped flanges 6c and 12c, which are first engaging portions protruding in the axial direction of the valve 100, are provided. In addition, the outer periphery corner | angular part of the collar parts 6c and 12c is formed in R shape for electrolytic relaxation. Further, the flange portions 6c and 12c are provided with contact bonding seating surfaces 6d and 12d, which are arranged in the axial direction of the vacuum valve 100 rather than the plane portions of the axial end surfaces of the fixed side and movable side coils 6 and 12. The distance d shown in FIG. Further, the fixed side and movable side contacts 7 and 13 have three slits 7e and 13e, respectively, and step portions 7f and 13f as second engaging portions are provided on the outer edge. As shown in FIG. 5, the widths X of the flanges 6c and 12c are configured to be narrower than the width Y of the slits 7e and 13e. The assembling method of the fixed side and movable side contacts 7 and 13 and the fixed side and movable side coils 6 and 12 first aligns the slits 7e and 13e of the fixed side and movable side contacts 7 and 13 and the flanges 6c and 12c. Next, the movable side and fixed side contacts 7 and 13 are rotated as shown in FIG. 6, and the stepped portions 7f and 13f and the first engaging portions 6c and 12c are fitted as shown in FIG.

  As described above, in the vacuum valve according to the first embodiment, the L-shaped flange portion that is the first engaging portion protruding from the contact is provided on the outer edge of the coil, and the second engaging portion is provided on the outer edge of the contact. Since the step portion is provided and the contact is turned to partially braze after the coil, the first engagement portion and the second engagement portion are fitted, the contact and the contact in the final brazing step Even if the brazing material between the coils is remelted, the contact does not move in the axial direction, and a vacuum valve with good assembly workability can be obtained. In addition, since the structure that fits the contact part and coil engagement part is provided on the outer edge, it is easy to check the condition of the fitting part after partial brazing, and it is easy to identify defective products. Can be improved.

  In the first embodiment, the step portion is provided around the outer edge of the contact point. However, the step portion may be provided only on a part of the outer edge as shown in FIG. Further, as shown in FIG. 9, the tip of a metal rod (not shown), for example, is inserted from the gap between the slits 7e and 13e provided at the brazed contact of the fixed electrode portion, and this metal rod is attached with a hammer or the like. A caulking portion 17 may be provided which is crushed to crush a part of the engaging portion between the coil and the contact point and cause plastic deformation. By providing the caulking portion 17, the contact can be prevented from shifting not only in the axial direction but also in the circumferential direction in the final brazing process. The caulking portion provided in the engaging portion of the coil and the contact does not need to be provided in all the engaging portions of the contact and the coil, and by providing at least one caulking portion among the plural engaging portions, Deviation can be suppressed.

Although the case where the insulating container is made of ceramic has been described in the first embodiment, it is obvious that the insulating container may be glass. In the first embodiment, the case where the number of arm portions is three has been described. However, the number of arm portions may be four or more. For example, when there are four, the same effect can be obtained by providing at least two opposing engaging portions and fitting and joining them. By the way, in Embodiment 1 described above, it has been described that a brazing material of a ring-shaped foil is arranged between each component, and this brazing material is brazed by melting and solidifying, but each component is engaged. The same effect can be obtained even when brazing is performed by winding a brazing material on a wire around the outer edge of the part, and melting and solidifying it.

Embodiment 2. FIG.
The contact of the vacuum valve according to the first embodiment has a stepped portion that fits with a flange provided on the outer edge of the coil on the outer edge. On the other hand, the contact of the vacuum valve according to the second embodiment is provided with a groove that fits the flange on the outer edge. That is, the first embodiment and the second embodiment are different in the shape of the contacts, and the other configurations are the same.

10 is an enlarged cross-sectional view of the vacuum valve electrode portion of the second embodiment, FIG. 11 is an electrode component diagram, FIG. 12 is an enlarged cross-sectional view of the contact and coil engaging portion, and FIG. 13 is a perspective view of the contact. 10 to 13, the same or corresponding parts as those in FIGS. 1 to 9 are denoted by the same reference numerals. Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 10 to 12, grooves 18 g and 19 g which are second engaging portions are provided on the outer edges of the fixed side and movable side contacts 18 and 19. The assembly method of the fixed side and movable side contacts 18 and 19 and the fixed side and movable side coils 6 and 12 is the same as that of the first embodiment described above. The positions of the joint portions 6c and 12c are aligned. Next, the movable side and fixed side contacts 18 and 19 are rotated to fit the groove portions 18g and 19g and the flange portions 6c and 12c.

As described above, in the vacuum valve according to the second embodiment, the L-shaped flange portion that is the first engagement portion protruding from the contact point is provided on the outer edge of the coil, and the second engagement portion is provided on the outer edge of the contact point. Since the groove portion is provided and the contact is rotated so that it is partially brazed after being fitted to the coil, the contact is not lost even if the brazing material between the contact and the coil is remelted in the final brazing process. A vacuum valve that does not move in the axial direction and has good assembly workability can be obtained. Further, since the stepped portion as shown in the first embodiment is unnecessary, the contact point can be increased to the flange portion, and as a result, the interruption performance and the electrolytic relaxation performance can be improved.

  In the second embodiment, the groove is provided around the outer edge of the contact, but the same effect can be obtained even if it is provided only at a part of the outer edge of the contact as shown in FIG. Further, a caulking portion may be provided as in the first embodiment.

1 insulating container, 2 fixed side electrode, 3 movable side electrode, 4 fixed side end plate, 5 fixed side electrode rod,
6 fixed coil, 7, 18 fixed contact, 8 movable end plate, 9 movable electrode rod,
12 Movable coil, 13, 19 Movable contact, 17 Caulking part,
6c, 12c collar, 7f, 13f step, 18g, 19g groove, 100 vacuum valve

Claims (6)

An insulating container having a fixed side plate and a movable side plate fixed to both ends;
A fixed-side electrode rod fixed to the fixed-side end plate;
A movable-side electrode rod provided on the movable-side end plate so as to freely advance and retract;
Coils provided at opposite ends of each electrode rod;
In a vacuum valve having a contact provided respectively on the opposite side of each coil,
A first engagement portion is provided on the outer edge of each coil,
A second engagement portion is provided on the outer edge of each contact,
A vacuum valve characterized in that any one of the coils and the electrodes is rotated to fit the first engaging portion and the second engaging portion. 2. The vacuum valve according to claim 1, wherein the first engagement portion has an L shape protruding from the contact. The vacuum valve according to claim 1, wherein the second engagement portion has a step shape. The vacuum valve according to claim 1, wherein the second engagement portion has a groove shape. The vacuum valve according to any one of claims 1 to 4, wherein the first engaging portion and the second engaging portion are caulked. The vacuum circuit breaker carrying the vacuum valve of any one of the said Claim 1 thru | or 5.

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