JPS5875722A - Vacuum valve - 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 Technical Field of the Invention The present invention relates to vacuum pulp, and more particularly to the structure of a flange shield.

(b) Prior Art Vacuum pulp has been widely used in recent years because it has at least a pair of electrodes that can be moved toward and away from each other in an insulated vacuum container and has excellent discontinuation characteristics. Figure 1.

FIG. 2 shows the structure of conventional vacuum pulp.

In Fig. 1, an insulating container 1 made of SETSUGIX or the like, and metal studs 1m and 1b fixed to the ends of the insulating container 1, respectively, are shown.
, and further sealing fittings 5 m and 5 b.

An end plate that closes the end of! A pair of mutually opposing electrodes 4 a e 4 b attached to a current-carrying shaft JaeJb are provided in a vacuum container formed by a vacuum chamber, and one end plate is held in a vacuum state by a bellows 6 with one current-carrying shaft 1b serving as a movable shaft. It is fixed to 2b and can be moved in and out. The arc that occurs between the electrodes when the current is interrupted causes the electrode 4 m
In order to prevent metal vapor generated from +4b from adhering to the inner surface of the insulating container 1 and deteriorating its insulation properties, the arc shield 1 is fixed to the inner surface of the insulating container 1 so as to surround the electrodes 4a and Jb. I'm doing it. Sealing fittings 5m, 5b
and the end plates 2*, 2b are fixed to each other by welding their ends.

In order to alleviate the electric field at the atmospheric side ends of the sealing fittings 5 a e 5 b, the ends are bent radially inward to further reduce the amount of metal vapor adhering to the inner surface of the insulating container 1. Flange seal P1 &.

8b is attached to the inner surface of the end plate l*, 1b.

In the vacuum pulp with the structure shown in Figure 1, the end plate Jar! This is an example of vacuum pulp in which IS and sealed gold odor 1m and 5b are sealed by welding, but stress is likely to be concentrated in this welded part due to the impact force when the vacuum valve is opened and closed, and vacuum leakage occurs from this welded part. There is a possibility that it will. For this purpose, sealing methods that do not involve welding have been considered, an example of which is shown in FIG.

In Fig. 2, the newly arrived metal fitting Z Oa * J Ob has its circumference bent into a U-shape, and the υ-shaped outer diameter portion 1
1 and both ends of the insulating container 10 are butted and brazed to form a butt seal structure.

1 In addition, the U-shaped inner diameter portion 13 of the sealed metal odor 10m and 10b is as follows:
It is bent inward in the radial direction into an abbreviated shape, and the end of the OL shape is fixed to the end plate by brazing. With this structure, the impact force when the current is opened and closed in the vacuum nozzle is relaxed by the U-shaped part and acts directly on the sealing part.The other structures are the same as those shown in FIG. 1, so their explanation will be omitted.

(@) Problems with the Prior Art However, the vacuum pulp having the structure shown in FIG. 2 has the following problems. The new metal fittings 101゜10b have a U-shape, and the electric field strength is lower than the protruding welded parts of the new metal fittings Is and lb in Fig. 1, which has the effect of mitigating the electric field. If the voltage becomes high, sufficient electric field relaxation effect cannot be expected with this alone, but if the interruption current increases, the amount of metal vapor generated from the electrode during interruption also increases, and as shown in Figure 2, the arc shield r There is also the problem that if only the metal vapor is used, it is not possible to sufficiently prevent the metal vapor from adhering to the inner surface of the insulation capacitor s1, and the insulation properties deteriorate. In an attempt to solve the above problems, the conventional 7-lunge shield JlaeJlb as shown in Figure 1 was replaced with an end plate s.
*, Even if you try to attack mbK, the sealing fittings 10m and 10b, which have a combination of U-shape and L-shape as shown in Fig.
In the vacuum ΔLuzo with
j Ob limits the diameter of the end of the flange shield 8*e8b attached to the end plates 9m and 9b, making it impossible to have a sufficiently large diameter. That's why it's impossible
If the distance between the container 1 and the 7 radius shields IIm and IIb is large, the effect of mitigating the electric field of the sealing fittings 10 and 101m by the fla/dishield II and abK cannot be obtained.

(a) Purpose of the Invention The present invention is based on the above-mentioned circumstances.
7 by improving the lunge shield), j! The purpose is to provide vacuum pulp with improved voltage resistance performance.

(・) Examples of the invention Hereinafter, one embodiment of the present invention will be described with reference to FIG.

In FIG. 3, an end plate 9 that closes the end of the insulated passenger equipment 1 is shown.
One end of the approximately cylindrical flange shields 11m, 11b is fixed to the inside surface of the container of a e l b, and the other ends of the flange shields 11m, 11b are bent into an arc shape outward in the radial direction. ing. Other configurations are in the second
It is similar to the figure, and the same parts as in FIG. 2 are given the same reference numerals, and detailed explanation thereof will be omitted.

According to the above configuration, the 7 flange shield is 11 mm.
The 1lb bent arcuate portion 15 creates a sealing metal odor 1.
The effect of alleviating the electric field strength of 0* and 10b is obtained, and as a result, it is possible to suppress the external creeping flash voltage value of the vacuum pulp to a low value, and the withstand voltage performance is improved. Furthermore, the area for protecting the inner surface of the insulating container 1 is increased by the flange shields 11&, 11bK, and the amount of metal vapor adhering to the inner surface of the insulating container 1 can be reduced, so that the withstand voltage performance is further improved.

(f) Effects of the Invention As described above, according to the present invention, a cylindrical 7-lunge shield is fixed to the inside surface of the container of the end plate in a vacuum pulp having a new round metal fitting that combines a mouth shape and an L shape. Furthermore, since the other end of the 7-range shield is bent radially outward in an arc shape, the electric field strength of the sealing fitting can be alleviated, and a vacuum knob with improved voltage resistance performance can be provided. .

[Brief explanation of drawings]

FIGS. 1 and 2 are sectional views showing conventional vacuum pulps having different structures, respectively, and FIG. 3 is a sectional view showing an embodiment of a vacuum/drying valve according to the present invention. 1...Insulating container, ja,! b-” end plate, 2*, Xb・
...Electric shaft, 4m, 4b...Electrode, 5m, lb...
Sealing metal A, g...Bellows, 7...Arc shield, #a, #b...7 Lunge shield, 9 a e g
b・”End plate, 10 m, 10 b-=sealing fitting,
11a. 11b...Flange shield, 12-...U-shaped portion outer diameter portion, 7J...U-shaped portion outer diameter portion. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A vacuum container consisting of an insulating container, a sealing fitting having one end fixed to the end of the insulating container by brazing, and an end plate fixed to the other end of the sealing fitting by brazing. In the vacuum pulp having the above-mentioned vacuum pulp, the sealing fitting has a U-shaped part extending from the center in the axial direction of the insulating container, and an inner end of the U-shaped part is bent radially inward into an L-shape, and A vacuum pulp characterized in that one end of a substantially cylindrical seven-range shield is fixed to the inner surface of a vacuum container, and the other end is bent radially outward into an arc shape.