JPS5963626A - Vacuum bulb - 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 a vacuum nozzle which is an improved method for mounting a guide and a plate for fixing a guide on a movable shaft.

[Prior art to the invention]

FIGS. 1 to 4 show the structure of a mounting portion of a guide of a conventionally used vacuum valve. Figure E: Longitudinal sectional view,
FIG. 2 is a view taken in the direction of the ■ arrow in FIG. The pJ axis l is connected to the end plate 3 via the bellows 2, and furthermore, the bellows 2 and the guide 4 (two-way axial direction (two right stomach movement) are enabled.

The guide 4 is attached and fixed by point welding the guide mounting plate 5 to the end plate 3; Welding is carried out by passing a current between points 6b. 7 is bellows 2 and end plate 3
Chikaradama brazing (indicates a joint that is joined airtightly by two
81 also shows a joint where the metal fitting 9 and the end plate 3 are joined together by brazing (two-way airtight).

By the way, when spot welding is performed between 12 6a and 6b as shown in No. 1111, if the spot welding point 6b is directly above or outside the joint 8, the current path 10 becomes like a broken line,
As a result of experiments, it was found that there is a possibility that the area near the joint part 8 would be heated and the airtightness would be broken.

Further, FIG. 3 is a longitudinal sectional view showing a case where one point 6a of spot welding is located directly above or inside the joint portion 7, and FIG. 4 is a view taken in the direction of the arrow ■ in FIG. In this case as well, the current path IO becomes as shown by the broken line, and it has been found through experiments that there is a possibility that the vicinity of the joint 7 will be heated and the airtightness will be broken.

[Objective of the Invention] The present invention has been made in order to eliminate the drawbacks of the prior art described above.The guide installation is performed by optimizing the position of the spot welds on the plate; The purpose is to provide vacuum pulp with improved reliability.

[Summary of the invention]

The present invention is characterized in that the spot welding position for joining the guide mounting plate and the end plate is located in the middle of the end plate and the metal fitting, and the end plate and the bellows, avoiding the inner joints between them. be.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 5 and 6, in which the same parts as in FIGS. 1 to 4 are given the same reference numerals and their explanations are omitted, the difference from the conventional method is that spot welding is performed at the joint between the bellows and the end plate 3. 7 and metal fittings 9
and between the joint 8 of the end plate 3.

In this way, the current path 10 looks like a broken line and is away from the inner joints 7 and 8, so it will not heat up to the vicinity of the joints 7 and 8, which will cause problems in maintaining airtightness. We have confirmed through experiments that this is not the case.

In the above-mentioned embodiment, the interval between the inner joint parts 7 and 8 is wide, but in a miniaturized vacuum valve, the inner joint part 7
and 8 becomes narrow, and it may be difficult to avoid the inner joints 7 and 8 and perform spot welding using the spot welding method described above. In such a case, as shown in FIG. 7 and FIG.
By providing an arc-shaped cutout lOa between and 8', one point 6b of the one-point weld is made into a notch lOa, and the other point 6a is on almost the same circumference as 6b, and the inner joint 7 and 8 can maintain airtightness.

Furthermore, instead of the embodiment shown in FIGS. 7 and 8 described above,
It may be configured as shown in FIG. 9 and LO diagram. That is, the guide installation is performed by forming the outer periphery of the plate 11 with three cutting lines 11a and three circular arcs ttb, and these cutting lines tta and circular arcs l1l) are both formed between the inner joints 7 and 8, as described above. You can get the same effect.

In this embodiment, the space outside the cutting line 11a is wider than the arcuate notch 5a described above, so spot welding is easy. In addition, even when manufactured by press working, there is less deformation compared to the above-mentioned arc-shaped notch structure, so the gap between the end plate 3 and the guide mounting plate 5 is also small, which makes spot welding strong (one step is required). There are also advantages.

Furthermore, the guide mounting plate may be arranged as shown in FIG. 11 or 12. That is, the guide attachment plate 12 shown in FIG.
and the circular arc 12b are both formed so as to be located between the inner joint parts 7 and 8.

The effect obtained by this is that the guide mounting plate 11 described above
is the same as Furthermore, in this embodiment, if spot welding is performed close to the intersection of the cutting line 12a and the circular arc 12b, eight spot welds can be made. be.

The guide mounting plate 13 shown in FIG. 12 has a polygonal outer periphery made of straight lines.

The positional relationship between the inner joints 7 and 8 and the effects obtained are as described for the guide mounting plate 12. Furthermore, if spot welding is performed near the intersection of straight lines, 12 spots can be welded, increasing the number of spot welding spots, which also has the advantage of increasing welding strength. In this way, the welding position is determined by the intersection of two straight lines,
Alternatively, the intersection of the cutting line and the circular arc can be utilized, and the number of spot welds can be easily increased, so it is also possible to apply □ vacuum pulp (1), which requires strength.

[Effects of the Invention] As explained and explained above, according to the present invention, a guide mounting plate can be provided by optimizing the spot welding position of the plate for guide mounting.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing the configuration of the guide attachment part of a conventional vacuum valve, Figure 2 is a plan view seen from the direction of the ■ arrow in Figure 1, and Figure 3 is a conventional vacuum valve different from Figure 1. FIG. 4 is a plan view as seen from the direction of the arrow ``■'' in FIG. 3. FIG. 6 is a plan view seen from the direction of the arrow ■ in FIG. 5, FIG. 7 is a longitudinal sectional view showing the main parts of another embodiment of the present invention, and FIG. 8 is a plan view seen from the direction of the south arrow in FIG. 7. Plan view,
FIG. 9 is a longitudinal sectional view showing the essential parts of another embodiment of the present invention (1 different from the other), FIG. 10 is a plan view seen from the direction of the arrow X in FIG. 9, and FIG. A plan view of another embodiment different from the figure, and FIG. 12 is a plan view of still another embodiment of the present invention. 2... Bellows 3... End plate 4... Guide 7.8.・・Joint parts LO, LL, L2.L3
...Guide mounting plate (7317) Agent
Nori Kon Mayu <ih or 1 person) Figure 1 Figure 3 Figure 5 Figure 6 Figure 7/Q^ 6b Figure 9

Claims (2)

[Claims] (1) A pair of electrodes that can be relatively connected to and separated from each other is arranged in a vacuum container consisting of an insulating container and metal fittings and end plates attached to both ends of the container. The shaft is connected to the end plate via a bellows so as to be movable in the axial direction, and a guide is provided on the outer periphery of the movable shaft, and the guide mounting plate is provided to cover the guide. In the case where the guide is fixed by attaching the guide to the end plate by spot welding, the spot weld is located between the joint between the bellows and the end plate and the joint between the metal fitting and the end plate. Features a vacuum valve. (2) The vacuum valve according to claim (1), wherein the guide is attached by shaping the outer periphery of the plate to shoulder at least one straight section.