JPS6142829A - Vacuum interrupter - 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 Field of the Invention The present invention relates to a vacuum interrupter that can activate the getter by heating only the getter in the vacuum container by tm without heating the entire vacuum interrupter by 7 JD.

The conventional vacuum interrupter is assembled by brazing and creates a vacuum inside the vacuum container, but the degree of vacuum inside the vacuum container may drop after that.

This is due to gas remaining in the brazing part, and contact V as a process after the vacuum interrupter is completed.
When the * pole on the movable side is pressed against the electrode on the co-moving side, gas will come out from the gas reservoir, or the electrode FF3ifIK
This is due to the gas remaining in the gas being released.

To increase the degree of vacuum, a getter can be provided in the vacuum container to absorb all the gas, but there is a limit to the absorption and transfer depending on the condition of the getter surface. Conventionally, therefore, the entire vacuum interrupter is heated to diffuse the gaseous compounds adhering to the getter surface into the getter and reactivate it so that gas can be adsorbed again.

However, the problem to be solved by the invention is that in order to heat the getter, the entire vacuum interrupter must be heated, which is unreasonable.

Therefore, an object of the present invention is to provide a vacuum interrupter that can be reactivated by heating only the getter without heating the entire vacuum interrupter.

Means and Effects for Solving the Problems The present invention provides a method of attaching a heater to a getter and, with the vacuum container sealed, leading all the heater wiring to the outside of the vacuum container, and connecting the wiring to the t-power source. This made it possible to heat only Getta with the sword.

EXAMPLE The present invention will be described in detail below based on an example shown in the drawings.

Example 1i is shown in FIG. Metal end plates 2.3 are sealed to both ends of a substantially cylindrical insulating cylinder 1 made of ceramic. A vacuum container 4t is formed. A fixed lead rod 5 is sealed inside the vacuum container 4 by penetrating the end plate 2t, and a movable lead rod 6 that can approach and move away from the fixed lead II5 is attached to a bellows 7.
It is attached to the end plate 3 through the t. Electrodes 5a + 6a are fixed at mutually opposing ends of the fixed lead rod 5 and the movable lead vs6. A protrusion 1a is formed on the inner periphery of the top tube 1 over the entire circumference, and an arc shield 8 is attached to the protrusion 1a. At least one ring-shaped getter 9 is provided between the arc shield 8 and the insulation [1]. A heater (not shown) is embedded inside the getter 9, and the heater wiring 10 a e 10 b is led to the outside of the connection part 1.
I'm here.

The getter 9 is attached in the manner of an arrow. Wires 10a and 1T slightly larger than 10b are connected to the white cylinder 1.
Drill a through hole and place it in the RF through hole 10a.

1 (lb'i). Then, insert the brazing material into the 4 holes.
After that, it is transferred to the vacuum furnace mentioned above and brazed together with other parts.

If the degree of vacuum in the vacuum container 4 is low, the wiring 1 ()
a and 11) Connect fi to the power source and heat the getter 9. Then, the gas compound previously adsorbed on the surface diffuses into the getter, and the gas adsorption ability is regained. For example, if the getter 9 is a ZR type getter, it will be adsorbed to the surface of the N, .

Examples 2 and 3 are shown in FIG. 2 and the third factor. In the figure, 11 is a glass insulating rfm, 12, 13 is a metal end plate, 16 is an IL empty answer device, 14 is a fixed lead rod, and 15 is a movable lead a.
What about 14a and 15a? 111 poles, 18i bellows, 19 a shaft shield, 20 a bellows shield, 21 an arc shield, 22 a sealing fitting, and 23 a pipe-shaped exhaust pipe made of copper. In FIG. 42, a ring-shaped getter 24 is provided between the insulating tube 11 and the arc shield 21.
Arrangement 25a, 25b of heaters (not shown) embedded in
t”!8 rim 1 shank 11 outside was 47.
l In FIG. 3, a ring-shaped getter 26 is provided between the shaft shield 19 and the fixed 1i 1114, and wiring 27a, 27b of a heater (not shown) embedded in the getter 26 is guided to the outside of the end plate 12. be.

The vacuum interrupters shown in Figures 2 and 3 cannot be brazed in a vacuum furnace because the insulating cylinder is made of glass whose melting point is lower than that of the brazing filler metal. Since the plate 12.13 is welded, the getter 24.26
If the getter 24 is attached to the insulating cylinder 11, the wiring 25a, 25b is also attached in the atmosphere.
Either heat it sufficiently and push it into the insulating tube 11, or heat the insulating tube locally to soften it and then push the wiring. Getter 26ft: When installing on end plate 12,
A through hole F is bored in the end plate 12, and the holes 27a, 2 are arranged in the through hole.
7bt” and braze it.

As described in detail, according to the present invention, a heater is attached to the getter inside the empty container, and the wiring for the heater is led to the outside of the vacuum container. It is possible to heat only the getter without heating the entire container. Therefore, the entire vacuum interrupter'
The work for activating the getter is easier and the cost for activating it is lower than heating at K710.

[Brief explanation of the drawing]

1 to 3 relate to embodiments of the vacuum incluctor according to the present invention, FIG. 1 is a sectional view of Embodiment 1, FIG. 2 is a sectional view of Embodiment 2, and FIG. 43 is a sectional view of Embodiment 3. It is a diagram. 4.28...Vacuum container, 5.14...Fixed lead rod, 6.15...9 moving lead rod, 5ae6as14a. 15a... Electrode, 9.24.26... Getter, 10
a. 10b, 25a, 25b, 27a, 27b... Wiring. Figure 1 6.15-------1------Machimo t+-F bar 9
．． 24.26----------・-''r77 Figure 3

Claims (1)

[Claims] In a vacuum interrupter, which has lead rods that can approach and separate from each other inside a vacuum container, and electrodes are fixed to opposite ends of both lead rods, gas compounds adsorbed on the surface are heated inside the vacuum container. A vacuum interrupter comprising: a getter having a property of diffusing into the vacuum vessel; a heater is attached to the getter; and wiring of the heater is led to the outside of the vacuum vessel.