JPH06150788A - Vacuum valve - Google Patents

Abstract

PURPOSE:To facilitate processing and assembly and provide a vacuum valve having a high mechanical strength by fixing one end of a flange vertically to the end face of an insulated vessel, bending the other end of the flange to form an angular a part, and brazing this detention part airtightly to the end plate. CONSTITUTION:One end of a flange 3 is fixed vertically to the end face of an insulated vessel 1, while the other end of the flange 3 is bent into a hook etc., in such a way as surrounding the peripheral circumferential surface of an end plate 5, to form an angular part. This angular part is airtightly brazed to the end face 5 using a brazing material 12. The brazing can be conducted without dislocation if the fit of the flange angular part inner surface with the end plate peripheral circumferential surface is set properly. According to this structure in which the vertical portion of the flange 3 connects the insulated vessel 1 with the end plate 5, the rigidity obtained is high against a vertical direction force generated by opening and closing of the electrode and it is not likely to generate stress concentration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum valve which constitutes a current cutoff portion of a vacuum switch.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show, for example, JP-A-54-1242.
FIG. 11 is a vertical cross-sectional view showing the entire conventional vacuum valve shown in Japanese Patent Publication No. 68 and details of essential parts. In the figure, 1 is an insulating container,
2 and 3 are flanges fixed to the end surface of the insulating container 1, and 4 and 5 are end plates 6 airtightly joined to the flanges 2 and 3.
Reference numeral 7 is a current-carrying rod arranged so as to penetrate through the end plates 4 and 5, and 8 and 9 are electrodes fixed to the inner ends of the current-carrying rods 6 and 7, 10 is one end and the other end is the end plate 4. Bellows fixed to the current-carrying rod 6, 11 is a shield fixed to the insulating container 1,
Reference numeral 2 is a brazing material inserted between the flange 3 and the end plate 5.

The conventional vacuum valve is constructed as described above, and the respective parts are joined by brazing or welding. For example, on the fixed electrode side, the end plate 5, the current-carrying rod 7, and the electrode 9 are brazed and assembled, and further, the flange 3 is brazed to the insulating container 1 in advance.
The end plate 5 and the end plate 5 are brazed with the brazing material 12. At this time, the flange 3 is bent inward from the horizontal portion in the creeping direction of the insulating container 1 so as to have an L-shaped cross-section, and is fitted to the outer peripheral surface of the plate end 5 to prevent misalignment of the end plate 5. There is.

[0004]

In the conventional vacuum valve as described above, the flange 3 is arranged between the outer peripheral surface of the end plate 5 and the inner diameter of the insulating container 1, and the fitting dimensions of the parts are high brazing temperature. High accuracy is required in consideration of thermal expansion at the time. In particular, the insulating container 1 made of ceramics or the like has a problem that it is more difficult to control the dimensions than a metal, and a highly accurate one is expensive. In addition, since the flange 3 is generally thinner than the end plate 5, the horizontal portion of the flange 3 has electrodes 8,
There was a problem in strength that the rigidity was low with respect to the vertical force generated by opening and closing 9, and stress was likely to concentrate.

The present invention is intended to solve such a problem, and an object thereof is to provide a vacuum valve which is easy to process and assemble parts of an insulating container and a flange and has high mechanical strength.

[0006]

In a vacuum valve according to the present invention, one end of a flange is vertically fixed to an end surface of an insulating container, and the other end of the flange is bent outward so as to surround an outer peripheral surface of an end plate. To form an engaging portion and braze the engaging portion in an airtight manner.

Further, the airtight brazing of the engaging portion is performed in a vacuum furnace to finally seal the vacuum container to manufacture a vacuum valve.

[0008]

In the vacuum valve configured as described above,
Since the flange is arranged outside the insulating container, it is not necessary to consider the inner diameter of the insulating container and the fitting size of the flange. Further, since the flange is arranged parallel to the vertical force generated by opening and closing, the rigidity is high and stress concentration is less likely to occur.

Further, the position of the end plate is restrained from being displaced by the engaging portion of the flange during brazing, so that positioning is easy and no special jig is required.

[0010]

【Example】

Example 1. FIG. 1 is a longitudinal sectional view of a main part of a vacuum valve showing an embodiment of the present invention. Except for 3 and 5, 1 to 12 (partly not shown) are the same as the conventional vacuum valve described above. is there. 3 has one end fixed vertically to the end face of the insulating container 1,
The flange 5, which has the other end bent outward in a hook shape in cross section, is an end plate whose outer peripheral surface is fitted to this engaging part. In FIG. 1, the insulating container side is referred to as a first cylindrical portion, the end plate side is referred to as a second cylindrical portion, and a portion connecting both cylindrical portions having different diameters is referred to as a connecting portion.

In the vacuum valve configured as described above, brazing can be performed without displacement by properly setting the fitting dimensions of the inner surface of the engaging portion of the flange 3 and the outer peripheral surface of the end plate 5, and insulation is performed. Some variation in inner and outer diameters of the container 1 does not pose a problem. The vertical portion of the flange 3 is the insulating container 1 and the end plate 5.
Since the structure is connected, the rigidity is high with respect to a vertical force generated by opening and closing of the electrodes 8 and 9, and stress concentration hardly occurs.

Example 2. In Example 2 shown in FIG. 2, the flange 3 is bent outward to form a cup-shaped cross-section, and an engaging portion is formed.
By forming an angle on the outer circumference of the end plate 5 so as to fit in this engaging portion, the same effect as that of the above embodiment can be expected.

Embodiment 3. In the third embodiment shown in FIG. 3, the arrangement of the insulating container 1, the flange 3, and the end plate 5 of the first embodiment is reversed upside down, and the brazing filler metal 12 is arranged on the upper portion of the end plate 5 in the vicinity of the outer periphery thereof. The same action as can be expected.

Example 4. In the first to third embodiments described above, one flange of the vacuum valve has been described, but it is also possible to perform both flanges and end plates at the same time.

Example 5. The manufacturing of the first embodiment is performed by brazing and assembling the end plate 5, the conducting rod 7, the electrode 9 on the fixed electrode side, the end plate 4, the conducting rod 8, the electrode 8 and the bellows 10 on the movable electrode side, and the flange 2. , 3 attaching the shield 11 to the insulating container 1 brazed, then the flange 2
And the plate end 4 are welded, and the flange 3 and the end plate 5 are evacuated in a vacuum furnace and then brazed and sealed.

According to the above-described method for manufacturing a vacuum valve, when the flange 3 and the end plate 5 are brazed, the end plate 5 is prevented from being displaced by the engaging portion of the flange 3, so that positioning is easy and a special jig is used. unnecessary.

If both flanges are brazed as in the fourth embodiment, the welding process is eliminated and the exhaust path is doubled, so that the exhaust time in the vacuum furnace can be shortened.

[0018]

As described above, according to the present invention, one end of the flange is vertically fixed to the end surface of the insulating container, and the other end of the flange is bent outward so as to surround the outer peripheral surface of the end plate and engaged. Therefore, the work at the time of brazing becomes easy. Also,
Since the first cylindrical portion that comes into contact with the end portion of the insulating container, the second cylindrical portion that comes into contact with the end plate, and the connecting portion that connects these are configured, it is easy to attach the end plate and join the end plates. Strength is improved. Further, workability and reliability of the airtight structure are improved by performing the airtight brazing in the vacuum furnace.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part showing a third embodiment of the present invention.

FIG. 4 is a vertical sectional view showing a conventional vacuum valve.

FIG. 5 is a vertical cross-sectional view showing a main part of a conventional vacuum valve.

[Explanation of symbols]

 1 Insulation container 3 Flange 5 End plate 12 Brazing material

[Procedure amendment]

[Submission date] January 25, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

[0018]

As described above, according to the present invention, one end of the flange is vertically fixed to the end surface of the insulating container, and the other end of the flange is bent outward so as to surround the outer peripheral surface of the end plate and engaged. Therefore, the work at the time of brazing is easy, and the strength of the joint portion between the end plate and the flange is improved. Moreover, since the first cylindrical portion that abuts on the end of the insulating container, the second cylindrical portion that abuts on the end plate, and the connecting portion that connects these are configured, the end plate can be easily attached, and the end plate can be easily attached. The joint strength of is improved. Further, workability and reliability of the airtight structure are improved by performing the airtight brazing in the vacuum furnace.

Claims (3)

[Claims] 1. A vacuum valve in which a pair of movable and fixed electrodes which are respectively connected to and separated from the outside are arranged in a vacuum container in which end plates are airtightly joined to both ends of an insulating container via flanges, One end of at least one of the flanges is vertically fixed to the end surface of the insulating container, and the other end of the flange is bent outward so as to surround the outer peripheral surface of the end plate to form an engaging portion. Vacuum valve characterized by air-tight brazing. 2. The flange is composed of a first cylindrical portion joined to the insulating container, a second cylindrical portion joined to the end plate, and a connecting portion connecting the first and second cylindrical portions, Second
2. The vacuum valve according to claim 1, wherein the inner diameter of the cylindrical portion of is larger than the inner diameter of the first cylindrical portion. 3. The vacuum valve according to claim 1, wherein the connection between the flange and the end plate is finally sealed by airtight brazing in a vacuum furnace.