JPH0327871A - Jig for brazing - Google Patents

Abstract

PURPOSE:To reduce the size and weight of jigs and to allow the simultaneous brazing of a large quantity in a furnace by utilizing a spring and a spring receiving plate by means of the jig for brazing of vacuum circuit parts. CONSTITUTION:The spring receiving plate 16 is mounted to a stationary electrode 5 and a spring 17 to elastically press a stationary side metallic end plate 3 to the end plate receiving part of the electrode 5 is provided between both at the time of brazing the stationary side metallic end plate 3 to the stationary electrode 5 of the vacuum circuit parts. Both are then pressurized and heated in a vacuum atmosphere via metal solder 13 interposed between the stationary side metallic end plate 3 and the end plate receiving of the electrode 5 thereof. The sure brazing is executed in this way and the size of the jig is reduced. The brazing productivity of a large quantity of the stationary side assemblies is improved.

Description

[Detailed description of the invention] [Industrial application field]

This invention is a brazing jig used for brazing a fixed side metal end plate to a fixed electrode in vacuum type circuit components such as vacuum switch tubes, discharge devices with trigger electrodes, vacuum disconnectors, vacuum fuses, etc. It is related to.

[Conventional technology]

Figure 2 shows a conventional vacuum switch tube, in which l
is an insulating cylinder that protects the vacuum switch tube, and a movable electrode 4 and a fixed electrode 5 are arranged inside this insulating cylinder 1, and the movable electrode 4 is joined to the movable side metal end plate 2 via a bellows 8. There is. A is a movable assembly consisting of a movable electrode 4 and a bellows 8. On the other hand, the fixed electrode 5 is joined to the fixed metal end plate 3, and a fixed assembly B is constructed from the fixed metal end plate 3 and the fixed electrode 5. 6
．． Reference numeral 7 denotes metallized surfaces formed on both end surfaces of the insulating cylinder l, and a movable metal end plate 2 and a fixed metal end plate 3 are joined to each metallized surface 6.7. Note that the bellows 8 plays the role of supporting the movable electrode 4 in an expandable and contractable manner and electrically separating and connecting the electrodes 4 and 5, as in the conventional case. Furthermore, a shield tube 9 is disposed within the insulating tube 1 to prevent metal fine particles from the arc generated between the two electrodes 4.5 from adhering to the inner surface of the insulating tube 1. The insulating tube l and the shield tube 9 constitute an insulating tube assembly C. Further, FIG. 3 shows a brazing jig used for brazing the stationary side metal end plate 3 to the stationary electrode 5 of the vacuum switch tube. It consists of a fixed side metal end plate placed via a solder l3, which is pressed and biased by a weight lO. Next, the operation will be explained. First, when a short circuit accident occurs and an excessive current flows in the current path connected to the vacuum switch tube, the second
The movable electrode 4 shown in the figure is driven and separated from the fixed electrode 5 while being supported by the bellows 8. The opening operation of the movable electrode 4 is set to several 10 times to tens of thousands of times depending on the current capacity. Further, the fixed electrode 5 and the fixed side metal end plate 3 of the vacuum switch tube are brazed in a vacuum atmosphere furnace as described above using the pressing force of a weight lO as a brazing jig. ．． That is, in the fixed side assembly B, the fixed electrode 5
A metal solder 13 is arranged at the joint between the fixed electrode 5 and the fixed metal end plate 3 so as to form the end plate receiving part of the fixed electrode 5, the metal solder l3, and the fixed metal end plate 3 in the vertical direction from below. Next, weight I
O is placed on the fixed metal end plate 3 to pressurize the joint between the fixed electrode 5 and the fixed metal end plate 3. Here, the positioning jig l1 holds the fixed electrode 5 vertically and at the same time positions the entire temporarily assembled fixed side assembly B. The temporarily assembled fixed side assembly B is heated in a hydrogen or vacuum atmosphere furnace to a temperature higher than the melting point of the metal solder 13, and then cooled to separate the fixed side metal end plate 3 on which the metal solder 13 is arranged and the fixed electrode. 5 is brazed to complete the assembly of the fixed side assembly B. Although the movable assembly A is not shown, a metal solder 13 is placed at each joint, and the metal solder is heated to above its melting point in a hydrogen or vacuum atmosphere furnace and then cooled. The joint portion between the movable side metal end plate 2 and the bellows 8 on which the solder is arranged is brazed, and the assembly of the movable side assembly A is completed. Next, the vacuum switch tube is temporarily assembled by interposing the insulating cylinder assembly C between the movable side assembly A and the fixed side assembly B which have been assembled, and the same as above is installed on both end surfaces of the insulating cylinder L. The solder metal 13 is placed and heated in a vacuum atmosphere furnace to a temperature higher than the melting point of the solder metal 13, and then cooled to form a metallized surface 6 on which the solder metal 13 is placed.
, 7 and each metal electrode end plate 2, 3 are brazed,
Complete the vacuum switch tube assembly. In the production of vacuum switch tubes manufactured in this manner, a plurality of vacuum switch tubes are handled simultaneously in the brazing process in a hydrogen or vacuum atmosphere furnace.

[Problem to be solved by the invention]

Since the conventional brazing jig is configured as described above, the movable assembly A is placed in a hydrogen or vacuum atmosphere furnace.
, the input amount of the fixed side assembly B and the vacuum switch tube greatly affects the productivity, and in particular, when brazing the fixed side assembly B, the brazing part between the fixed electrode 5 and the fixed side metal end plate 3 is As the pressurizing force increases, the outer diameter of the weight 10 and the weight become larger than the outer diameter of the fixed side assembly B, and the fixed side assembly B is placed in a hydrogen or vacuum atmosphere furnace. The quantity of body B was regulated, which caused problems such as loss of productivity. This invention was made to solve the above-mentioned problems, and it is possible to sufficiently and easily apply pressure to the brazed portion between the fixed electrode and the fixed metal end plate when brazing the fixed side assembly. It is an object of the present invention to provide a brazing jig that can braze a large number of fixed side assemblies at once in a hydrogen or vacuum atmosphere furnace.

[Means to solve the problem]

The brazing jig according to the present invention has the following features for a fixed electrode:
A spring receiving plate is installed a predetermined distance from the fixed metal end plate, and between this spring receiving plate and the fixed metal end plate, the fixed metal end plate is pressed against the end plate receiving part of the fixed electrode. It is equipped with a spring.

[For use]

The spring receiving plate in this invention can be quickly and easily attached to the outer end of the fixed electrode via a mounting shaft, etc. Therefore, by this attachment, the spring attached to the lower surface of the spring receiving plate is contracted, and the fixed side metal It acts to press the end plate against the end plate receiving portion of the fixed electrode with a predetermined pressure.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, reference numeral 15 denotes a mounting shaft of a brazing jig, which is attached to the fixed electrode 5 by screwing its tip into it. 1
Reference numeral 6 denotes a spring receiving plate attached to one end of this mounting shaft l5, and here the mounting shaft l5 passes through this spring receiving plate 16. 17 is the spring receiving plate 16 and the fixed side metal end plate 3.
This spring 17 can be integrally attached to the spring receiving plate 16 in advance. Next, the operation will be explained. First, when brazing the fixed metal end plate 3 to the end plate holder of the fixed electrode 5, the spring 17 is placed on the fixed metal end plate 3, and then the end of the mounting shaft 15 is attached to the fixed electrode 5. Screw it into the screw hole l8 previously provided at the tip. Then, the spring work 7 is interposed between the spring receiving plate l6 attached to the mounting shaft 15 and the fixed side metal end plate 3,
The spring 17 presses the fixed metal end plate 3 against the end plate receiving portion of the fixed electrode 5 with a set pressure. Next, the fixed side assembly B in this state is positioned by holding the fixed electrode 5 end vertically using a positioning jig 1l, and then placed in a hydrogen or vacuum atmosphere furnace. and,
Here, after heating to a temperature higher than the melting point of the metal solder 13, the metal solder 13 is cooled, and the joint between the fixed side metal end plate 3 on which the metal solder 13 is arranged and the fixed electrode 5 is brazed, and the fixed side assembly B is assembled. Complete assembly. Although the movable assembly A is not shown, a metal solder is placed at each joint, heated in a hydrogen or vacuum atmosphere furnace to a temperature higher than the melting point of the metal solder, and then cooled. The joint between the movable side metal end plate 2 and the bellows 8 where the movable side metal end plate 2 is disposed is brazed, and the assembly of the movable side assembly 8 is completed. Next, the vacuum switch tube is temporarily assembled by interposing the insulating tube 1 assembly C between the movable side assembly A and the stationary side assembly B which have been assembled, and the above-mentioned A similar solder metal 13 is placed and heated in a vacuum atmosphere furnace to a temperature above the melting point of the solder metal 13, and then cooled to form a metallized surface 6.7 on which the solder metal 13 is placed and each metal electrode end plate 2. , 3 and complete the assembly of the vacuum switch tube. Further, the spring constant K of the spring 17 is -1113, k=
Gd'/8nD" (G: longitudinal elastic modulus, d: wire diameter, n
: number of turns, D=coil average diameter), the spring constant can be manipulated while keeping the coil average diameter fixed, and when brazing the fixed side assembly B, the fixed electrode 5 and the fixed side metal end plate 3 At the same time, sufficient pressure can be applied to the brazed part.
By making the outermost diameter of the brazing jig smaller than the outermost diameter of the fixed-side assembly B, brazing can be performed without reducing the quantity of the fixed-side assembly B to be put into the hydrogen or vacuum atmosphere furnace. can. Further, the total weight of the brazing jig can be much lighter than that using the conventional weight 10, and can be suppressed to, for example, q5% or less of the weight of the fixed side assembly B. In addition, although the case of the vacuum switch tube was explained in the said Example, the case of the discharge device with a trigger electrode, or other vacuum type circuit components may be sufficient, and the same effect as the said Example will be produced.

【Effect of the invention】

As described above, according to the present invention, the spring receiving plate is attached to the fixed electrode, and the fixed side metal end plate is placed between the spring receiving plate and the fixed side metal end plate. Since the fixed side metal end plate and the end plate receiving part of the fixed electrode are provided with a spring that presses them, the two are heated in a hydrogen or vacuum atmosphere furnace, etc. via a metal solder that is interposed between the fixed side metal end plate and the end plate receiving part of the fixed electrode. Pressurization. By heating, it is possible to braze reliably, and the shape of the jig body can be made small and the weight can be sufficiently reduced, so that a large number of fixed side assemblies can be brazed at once in the above-mentioned furnace. This has the effect of greatly improving the productivity of vacuum type circuit components.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing a brazing jig according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view showing a conventional vacuum switch tube, and Fig. 3 is a conventional brazing jig. FIG. 3 is a fixed side metal end plate, 5 is a fixed electrode, 13 is a metal solder,
l6 is the spring receiving plate, l7 is the spring. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation Name of the invention Relationship to the brazing jig amendment case Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Moriyayo Shiki Rito Postal code 105 Address 1-4-10 Nishi-Shinbashi, Minato-ku, Tokyo Details of column 66 of the detailed description of the invention in the specification (1) Page 3, 12 of the specification Delete the line ``This movable electrode 4... is set.'' in the 14th line of the same page. (2) On page 8, line 20 of the specification, the phrase ``insulation tube 1 assembly'' is corrected to ``insulation tube assembly.'' (3) From page 9, line 20 to page 10, line 1 of the specification, the statement ``Can be reduced in weight, for example, can be kept to 5% or less of the weight of fixed side assembly B.'' can. Further, in FIG. 1, the fixed electrode may be oriented upward. ” and corrected. that's all

Claims (1)

[Claims] In a brazing jig that holds a fixed metal end plate in pressure contact with an end plate receiving portion of a fixed electrode in a vacuum circuit component via a metal solder, the fixed electrode is placed at a predetermined distance from the fixed metal end plate. The wax is characterized by comprising: a spring receiving plate attached to the spring receiving plate; and a spring interposed between the spring receiving plate and the fixed metal end plate to press the fixed metal end plate against the end plate receiving portion. Attachment jig.