JPS586104Y2 - vacuum circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum circuit breaker, and more particularly to a device for preventing deformation of an electrode during disconnection in a vacuum circuit breaker.

Generally, as shown in Fig. 1, a vacuum circuit breaker includes a fixed electrode C and a movable electrode e sealed via a bellows d in a vacuum valve b made of an insulating material with a built-in shield plate a. By operating the electrode e from outside the machine, the fixed electrode e can be brought into contact with the stationary electrode e to energize it, or can be turned off and turned off.

Therefore, the breaking performance of a vacuum circuit breaker is superior or inferior depending on the configuration of each electrode c, e housed in the vacuum valve b, and the configuration of each electrode c, e changes the current course and arcs. It controls the current and cuts off the current, which has a large impact on its lifespan.

On the other hand, as shown in Figure 2, the electrodes that have been proposed include spiral electrodes and vertical magnetic field electrodes, but the materials used for each electrode part are relatively soft. Since pure copper or oxygen-free copper must be used, each electrode e, e is bent as shown by the chain line in Fig. 2 due to the impact force during the electrode closing and cutting operations. It deforms and generates a large arc, which greatly affects the life of the electrode.

In other words, the deformation of the electrodes caused by the impact force during the opening and closing operations of electrodes c and e occurs at the outer periphery of the electrodes, which is a thin part of the material. As shown, a reinforcing ring f is deposited on the back surface of one side of each of the spiral electrodes e and e, and this is fixed by silver brazing. Since it is attached, it has disadvantages such as being expensive.

In view of the above-mentioned points, the present invention has been developed by forming a circumferential groove on the outer periphery of an electrode that can be freely opened and closed in a vacuum pulp, and elastically fitting a reinforcing ring spring into the circumferential groove. Accordingly, the present invention provides a vacuum circuit breaker whose purpose is to improve breaking performance by preventing deformation of electrodes during impact during opening/closing operations.

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

In FIGS. 4 to 6, reference numeral 1 denotes an electrode (only one is shown in the figure) provided in the vacuum pulp so as to be able to come into contact with and separate from it. 3, a contact 5 is attached to the end face of the electrode part 4, and a circumferential groove 6 is formed on the outer periphery of the electrode part 4. ring spring 7
It is fitted elastically.

Therefore, the electrode part 4 of the electrode 1 is not soldered with silver, but is held elastically tightened by the reinforcing ring spring 7, so that the silver solder melts due to the heat generated at the time of interruption, causing an arc. This is to prevent the risk of being adversely affected by this, and to prevent it from deforming into an umbrella shape.

Next, the embodiment shown in FIGS. 7 and 8 is another embodiment of the present invention, in which instead of the spiral groove 30 formed in the electrode part 4, a plurality of radial straight grooves 3 ', and a contact plate 9 integral with the contactor 5 is fixed by each piece member 8, and the structure in which the ring spring 7 is elastically fitted in the circumferential groove 6 of the electrode part 40 is as described above. It has the same content as the specific example.

As described above, according to the present invention, the electrode 1 forming the disc-shaped electrode part 4 is provided at the tip of the conductive rod 2 which is provided in the vacuum bulb so as to be able to freely come and go. A ring spring 7 for elastic reinforcement is installed in the circumferential groove 6.
Since the electrode part 4 does not use silver solder, there is no risk of any adverse effects caused by the heat generated during disconnection.Furthermore, the elasticity of the ring spring 7 firmly tightens the electrode part 4, so that the electrode part 4 is shaped like an umbrella. It has excellent effects such as eliminating the risk of deformation.

[Brief explanation of the drawing]

1 to 3 are diagrams for explaining the already proposed vacuum circuit breaker, FIG. 4 is a sectional view showing only the main parts of the vacuum circuit breaker of the present invention, and FIG. 5 is a plan view of the same. FIG. 6 is an exploded perspective view of the present invention, and FIGS. 7 and 8 are views showing other embodiments of the present invention. 1...electrode, 2...electrode rod, 3...
...Spiral groove, 4...Electrode part, 5...
...Contact, 6...Peripheral groove, T...Ring spring.

Claims (1)

[Scope of utility model registration request] The conductive rod 2 is provided in the vacuum pulp so as to be able to come and go freely.
An electrode 1 forming a disc-shaped electrode part 4 provided at the tip of the
A vacuum circuit breaker comprising: a circumferential groove formed on the outer periphery of the electrode portion 4; and a reinforcing ring spring 7 elastically fitted into the circumferential groove 6.