JPS5956331A - 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 The present invention relates to a vacuum valve that prevents wear between a movable electrode and a bellows due to sliding friction between the two.

A moderate vacuum has high dielectric strength, and arcs generated within it are extinguished by diffusion, so vacuum valves have long been attracting attention as the switching contact part, which is the most important part of circuit breakers. The drawback was that it was difficult to maintain. However, this problem has been solved by advances in vacuum container manufacturing technology, and many vacuum breakers using vacuum valves having the configuration shown in FIG. 1 have come into use. In Figure 1, ? Both ends of the edge 1 are sealed by end plates 2-21, and the inside is evacuated. The movable electrode 3 passing through one end plate 2 faces the fixed electrode 4 provided passing through the other end plate 2, and moves in the direction of the fixed electrode 4 to bring the fixed electrode into contact with and away from it. End plate 2
The guide 5 is guided by a cylindrical guide 5 having a flange provided between the movable electrode 3 and the movable electrode 3. The bellows 6 has a cylindrical shape that can be expanded and contracted, and one opening is airtightly fixed to the end plate 2 and the other opening to the movable electrode 3, so that the bellows 6 can freely expand and contract in the direction of the fixed electrode 4, and can move the movable electrode 3. This also prevents vacuum leakage between the end plate 2 and the movable electrode 3.

Then, the movable electrode 3 is brought into contact with and separated from the fixed electrode 4 by an operation mechanism (not shown), and controls the opening and closing of the power circuit. Incidentally, the diameters of both electrodes are determined from the current carrying performance of the vacuum valve.

In addition, in order to reduce the force for expansion and contraction of the bellows and to reduce the driving energy of the movable electrode, the diameter of the bellows is preferably small, and the gap a between the movable electrode 3 and the bellows 6 in FIG. 1 should be made as small as possible. desirable. However, if the gap a becomes narrow, there is a risk that the movable electrode 3 and the bellows 6 will come into contact with each other. In particular, as the operating voltage of a vacuum valve increases, the stroke C of the movable electrode 3 becomes longer and the length %b of the bellows 6 also becomes longer. For this reason, when the movable electrode 3 moves to separate and the bellows 6 is compressed, the bellows 6 may bend and the movable electrode 3 and the bellows 6 may come into contact with each other. If the movable electrode 3 and the bellows 6 come into contact, the contact portion will be in sliding contact, and over a long period of time, the bellows will wear out and become perforated, causing a vacuum leak. As described above, the diameter of the movable electrode and the inner diameter of the bellows have a mutually contradictory relationship in that it is desirable that the difference be small in terms of driving energy, but on the other hand, it is desirable that the difference be large in terms of the life of the vacuum valve.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a vacuum valve which minimizes the operating energy of the vacuum valve and which does not cause wear of the bellows and cause vacuum leakage.

The purpose of this is to provide an end plate that seals both ends of the insulating tube, a movable electrode that passes through one of the end plates and faces the fixed electrode, and a guide that guides the movable electrode to move toward the fixed electrode. and a bellows having one opening attached to one of the end plates and the other opening attached to the movable electrode in an airtight manner to maintain a vacuum in the insulating cylinder and to make the movable electrode freely movable. This is achieved by the guide being made of a polymeric material having a lower hardness than the movable electrode and the bellows, and extending into the bellows so as to partition between the movable electrode and the bellows.

Embodiments of the present invention will be described in detail below based on the drawings.

In FIG. 2, in the vacuum valve, both ends of an insulating cylinder 1 are sealed by end plates 2-21, and the inside is kept under vacuum, as in the conventional vacuum valve. The movable armature 3 faces the fixed electrode 4 provided through the end plate 21 and penetrates the end plate 2 so as to be able to move in the direction of the fixed electrode 4 in order to come into contact with and separate from the fixed electrode 4. Further, the bellows 6 has the same shape as the conventional one, and one opening is hermetically fixed to the end plate 2 and the other opening to the movable electrode 3, so that the bellows 6 can freely expand and contract in the direction of the fixed electrode 4. This makes the movable electrode 3 movable and prevents vacuum leakage between the end plate 2 and the movable electrode 3. However, unlike the conventional guide, the guide 5 is located between the end plate 2 and the movable electrode 3 and not only guides the movable electrode 3, but also extends to the inside of the bellows 6 and guides the movable electrode 3 and the bellows 6. It's in charge. Therefore, the bellows 6 hardly bends when compressed, and even if it bends slightly, it will not be blocked by the guide 5 and come into contact with the movable electrode 3. Furthermore, since the guide 5 is made of a polymeric material having a lower hardness than the movable electrode 3 and the bellows 6, the bellows 6 will not wear out even if it touches the bellows 6 after sliding. , only guide 5 separates. Therefore, the life of the bellows is long and the vacuum of the empty valve can be maintained for a long period of time. In addition, when this guide becomes worn, it can be removed from the vacuum valve and replaced with a new one. In addition, since the bellows does not wear out in this way, the inner diameter of the bellows can be made sufficiently small, and the force required for its expansion and contraction can be made small, thereby making it possible to reduce the operating energy of the movable electrode.

As described above, in the vacuum valve according to the present invention, a guide made of a polymer material whose hardness is lower than that of the bellows and the movable electrode extends from between the end plate and the movable electrode to partition the movable electrode and the bellows. is inserted into. Therefore, the movable electrode and the bellows do not come into direct contact. The movable electrode and bellows come into sliding contact with the guide, but since the guide is less hard, they do not wear out. Therefore, the life of the bellows is long, and the vacuum of the vacuum valve can be maintained for a long period of time. Also, worn guides can be replaced with new ones. In this way, the bellows will not wear out, so the diameter of the bellows should be made as small as possible to reduce the force that causes it to expand and contract, making it movable! It is an excellent vacuum valve that can reduce the driving energy of the poles.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional vacuum valve, and FIG. 2 is a sectional view of a vacuum valve according to the present invention. DESCRIPTION OF SYMBOLS 1... Insulating tube, 2.2'... End plate, 3... Movable electrode, 4... Fixed electrode, 5... Guide, 6... Bellows. Figure 1 7- Procedural amendment (0 Red Patent Office - - - - - Official - 44゛Ire - Kazuo -
Tono ■, display of the incident Gekigan Showa 47-7g j, 3 J
-, l-4, Agent 6, Number of inventions increased by amendment 8, Contents of amendment Amended as shown in the attached sheet σ), Contents 1, Amended the scope of claims in the specification as follows. do. [1] An end plate that seals both ends of the insulating tube, and a solid-state tube that penetrates one of the end plates. A movable electrode facing the electrode. A guide for guiding the movable electrode to move toward the fixed electrode, one opening of which is placed in one of the end plates and the other opening of which is attached to the movable pole, is installed in an airtight manner within the insulating cylinder. While maintaining the vacuum of said movable! 1. A true 9-pulp characterized in that a movable electrode having a bellows for movably rubbing the pole and a member made of a polymeric material having a lower hardness than the bellows are interposed. 2. The description of the detailed description of the invention in the specification is amended as follows. (1) Specification - Page 4, line 13 (This statement "the guiding force 5... is extended" is corrected to the following statement. [There is no gap between the bellows and the movable electrode. 1- In the part corresponding to the extended part of the guide, a member made of a polymeric material with low hardness is interposed between the movable electrode and the bellows. (2) The number is written in the 9th line and month of the specification. θ) Add j′, 1 below statement next to “It is possible.” [In addition, in the example, the conventional guide itself was extended within the bellows, and the guide material + OJ@electrode and a polymer material with lower hardness than the bellows were used.
The key point is that the movement of the bellows and the movable electrodes (
This existing member is made of the polymer material θ) and θ1 as well as I7.
Since the initial purpose is achieved, for example, if the member is integrated with the conventional guide 5, then the member 0 should be treated as an independent member. ) It is obvious that the same effect can be obtained even if the above-mentioned polymeric material is used.
Reference numeral 7 denotes a member made of a polymeric material that is separate from the guide 5 and is independent of the guide 5. 3. The brief description of the drawings in the specification is amended as follows. (1) “is” written on page 7 @ line 7 of the specification is replaced with “,”
FIG. 3 is a sectional view of another embodiment of the vacuum valve according to the present invention. (2) Specifications - "Bellows" written on page 7, line 9 of 1F
Next to ζ, add ", 7... Member made of polymeric material". 4. Add attached Figure 3 to the specification. Sai, − ↑ ＼4 7

Claims (1)

[Claims] 1) An end plate that seals both ends of the insulating cylinder, and a bellows whose openings are airtightly attached to the movable electrode to maintain a vacuum in the insulating cylinder and to make the movable electrode movable. The vacuum valve is characterized in that the guide is made of a polymeric material having a lower hardness than the movable electrode and the bellows, and extends into the bellows so as to partition between the movable electrode and the bellows. .