JPS5828120A - Vacuum switching device - 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 switchgear, and more particularly, the present invention relates to a vacuum switchgear, in which a vacuum container is formed by closing both ends of a metal tube with insulating end plates, and one pair of electrodes are installed in the vacuum container by closing both ends of a metal tube with insulating end plates. This invention relates to a vacuum breaker Cζ which is provided so as to be freely approachable and separable via a pair of introduced electrode rods, which has an increased external insulation strength.

Generally, a vacuum breaker is made of gold or gold on both sides of an insulating tube made of glass or ceramic. A vacuum container is formed by closing the end plate, and a pair of electrodes are introduced into the vacuum container from both metal end plates so that they can be moved toward and away from each other through a pair of 11-pole wires. However, in recent years, with the aim of downsizing and reducing costs,
Gold I! A vacuum container was formed by closing both ends of the 4-ring with insulating end plates made of ceramics, and a pair of electrodes were introduced into the vacuum container so that they could approach and separate from both end plates. It can be freely connected and separated via a pair of electrode rods.
Some things have been proposed.

However, in the former vacuum breaker, the axial length of the insulating cylinder is the external insulation distance, and the test voltage for each working voltage -ζ was cleared with the vacuum breaker maternity leave, but in the latter vacuum breaker The polyphonic distance corresponding to the diameter of the insulation end plate is the external insulation distance.

Since the external insulation distance is approximately ζ of the former at the M-commodity voltage, the test voltage cannot be cleared with the vacuum breaker 'a alone, and it is necessary to strengthen the external insulation to match the internal vacuum insulation strength. was there.

The present invention has been made in view of the above-mentioned problems, and its purpose is to make the external insulation strength of a vacuum container made of a metal tube and insulating end plates that close both ends of the container comparable to the internal vacuum insulation strength. The present invention provides a vacuum switchgear which is capable of absorbing thermal effects caused by arcs and mechanical shocks during turning on and off operations. Embodiments of the present invention will be described in detail below with reference to one drawing.

FIG. 1 is a longitudinal sectional view of the vacuum opening/closing % according to the present invention.

In the figure, reference numeral 1 denotes an insulating case made of epoxy resin into a cylindrical shape at the bottom of the chest. Inside this insulating case 1, a cylindrical metal tube 2 is connected at both ends with insulating end plates 3 made of ceramic,
A pair of electrode rods 5 are hermetically closed to form a vacuum container, and electrodes 4.4 are introduced into the vacuum container from the center of both end plates 3.3 so as to be able to approach and separate from each other.゜5
A vacuum interrupter m6, which is provided with a contact/separator (contact/separation) freely, leads the fixed electrode rod 5 (upper side in the figure) from a hole 7 provided in the bottom center of the insulating case 1, and connects the fixed electrode @ The insulating end plate 3 on the 5 side is housed concentrically with an appropriate distance from the bottom of the insulating case 1.

An insulating case 1 is provided on the outer periphery of the metal tube 2 near the middle part of the vacuum breaker 6, in other words, on the outer periphery of the metal tube 2 facing the part where an arc is generated from contact and separation 5ζ of the electrode 4.4.
A single rubber ring 8 having an oval tubular cross-section and an outer diameter approximately equal to the inner diameter of the rubber ring 8 is fitted. The rubber ring 8 prevents the insulating case 1 and the vacuum breaker 46, which are integrated through the elastic body, from being adversely affected by the arc heat due to the compression of the air in the hollow part, such as the damage caused by the heat generated by the elastic body. The purpose of brazing the vacuum breaker 6 is to prevent parts from peeling off due to local expansion Cζ, breakage of the insulating end plate 3 made of ceramic, or breakage of the insulating case 1 made of epoxy resin. It is made of silicone rubber or urethane rubber, etc., which has excellent heat resistance. The insulating case 1 and the vacuum breaker 6 are made of silicone rubber, which is cast and hardened between them so that the insulating end plate 3 of the movable electrode rod 5 is in contact with the insulating case 1 and the vacuum breaker 6.
It is integrated by an elastic body 9 made of cast liquid rubber having excellent heat resistance and insulation properties, such as polybutadiene rubber or epoxy rubber.

In the figure, 10 is a bellows, and 11 is an I! ! A backing that is interposed between the bottom of the edge case 1 and the insulating end plate 3 on the fixed electrode rod 5 side of the vacuum breaker 6 and fitted onto the fixed electrode II5, and is insulating and has a backing that is approximately between the elastic body 9 and the backing. A ring-shaped groove is formed from elastic rubber. This is Sumire, 12 is the fixed electrode rod 5I protruding from the hole of the insulating case 1.
The screwed nut 13 is an injection port provided at the bottom of the insulating case 1 for injecting liquid rubber.

In order to manufacture a vacuum switchgear with the above configuration, it is necessary to install X air breaker 6#ζ. A rubber ring 8 having an oval tubular cross section is fitted around the outer periphery of $2 near the middle am. Next, fixed electrode 4! l! The backing 11 fitted on the insulating case 1 is connected to the bottom of the insulating case 1 and the fixed electrode IIs side. ! The vacuum breaker 6 is housed concentrically in the insulating case 1 by holding it in place on the edge plate, and the fixed electrode ms protrudes from the hole 7 of the insulating case 1. and temporarily fix the vacuum breaker 6 to the insulating case 1 by screwing them together. Then, pour the cast liquid rubber between the insulating case 1 and the vacuum breaker 6 from the injection port 13 and heat it to harden it,
Cast liquid rubber is poured into the opening of the insulating case 1 from the end (lower end in FIG. 1) so as to cover the outer surface of the insulating end plate 3 on the side of the movable electrode 1s5 of the vacuum breaker 6, and is heated and cured. By integrating the insulating case 1 and the breaker 6, the vacuum switchgear is completed.

In addition, in the above-mentioned embodiment, arc, especially accident 1
In order to buffer the effects of thermal history caused by the arc of the breaker, a rubber ring 8 of 1gj, which has an oval cross-section and an outer diameter equal to the inner diameter of the insulating case 1, is fitted into the metal tube 2. However, as shown in FIG. 2, or as shown in FIG. At the same time, the metal cylinder 2 and the insulating case 1 are fitted in multiple stages in the radial direction as if closing the space between the metal tube 2 and the insulating case 1. Or, as shown in Figure 4, 4! '
A rubber ring 8a formed into a cylindrical cross section with a diameter suitably smaller than the distance between the edge case 1 and the metal cylinder 2 is placed near the middle part of the metal cylinder 2 so that there is a gap between the rubber ring 8a and the insulating case 1. The same effect can be obtained even if the notched circumference 1c is fitted in the axial direction of the intersecting ridges.

As described above, in the true 9 switchgear according to the present invention, the outer surface of the vacuum breaker is formed by forming a vacuum container with a metal tube and an insulating end plate that closes both ends of the vacuum container with an elastic body made of cast liquid rubber. Therefore, the external flash value has been reduced by 5 compared to the conventional one.
It can be increased to about 10 times. In addition, since the insulating case and the vacuum breaker are integrated by an elastic body with 6ζ intervening between them, the mechanical shock when the vacuum breaker is turned on or off can be quickly attenuated. Rubbing the utensil can prevent peeling of the surface due to fatigue. In particular, the vacuum switchgear is of a sealed type in which an insulating case and a vacuum breaker concentrically housed within the insulating case are integrated by an elastic body made of cast liquid rubber interposed between the two. In this case, the heat of the arc generated by the contact and separation of the electrodes of the vacuum breaker causes local EC expansion of the elastic body facing the arc generation part, and this expansion is true 9 volumes! Pressure acts on the L or P edge tape, and vacuum breaker brazing may cause peeling of parts, breakage of ceramic insulating end plates, or breakage of the insulating case, but arcing in vacuum breaker A rubber link 11 in the shape of a middle 9 is provided on the outer periphery of the metal cylinder facing the generating part. II',
Since 8a was modified, the air inside the inner part 9 is warmed by the arc heat and its pressure is increased, so that the elastic body interposed between the insulating case and the breaker 9 does not expand locally. Brazing a vacuum breaker has the effect of preventing parts from peeling off, breakage of the insulating end plate made of two ceramics, or breakage of the insulating case.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a vacuum switchgear according to the present invention-ζ;
3 and 4 are sectional views of essential parts of other embodiments of the present invention. 1...? Edge tape, 2... Metal cylinder, S... Insulating end plate, 4... Electric field, 5... Electrode rod, 6... Vacuum breaker, 8°&', #a... Rubber Ring, 9...Elastic body. Figure 1 Figure 3 Figure 2

Claims (1)

[Claims] In a cylindrical insulation case with a bottom, both ends of the metal tube are closed with firewood edge plates to form a vacuum container, and a pair of 1if hot water is placed in the vacuum container relatively approaching and separating from both edge plates. A pair of freely introduced ′嵯4′i! Through Zen, freely connect and separate jQ
+Abandoned-1#! The air breaker is housed in a concentric manner Cζ with its one fixed insulating end plate on the palm side separated from the bottom of the insulating case, and a hollow metal cylinder is provided on the outer periphery of the metal cylinder facing the arc generating part of the vacuum breaker. Fit a rubber ring and connect the insulating case and vacuum breaker to the movable position of the vacuum breaker [M on the pole side! -11111'+ from cast liquid rubber that was cast and hardened between the two sides by cuffing the end plate.
A vacuum opening/closing device specially designed to be integrated into the body.