JPH0535549Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotating arc extinguishing type high-pressure gas switch having an arc coil, and particularly to an integrated structure of a bushing and a main contact portion.

[Conventional technology]

FIG. 3 shows the structure of a conventional main circuit switching section in this type of load switch.

In this conventional switch, an enclosure 21 formed into a cylindrical shape by bending a thin plate such as an iron plate is provided, and insulators 22, 22 are mounted on both walls of the enclosure 21.
are installed facing each other. And this insulator 2
A fixed electrode 23 and a movable electrode 24 were fixed to the housing 21, and several atmospheres of arc-extinguishing gas such as SF ₆ was filled into the enclosure 21 to form a gas-filled switch.

[The problem that the idea aims to solve]

In this conventional structure of the gas-filled switch, when the wall of the enclosure 21 protrudes outward due to the internal pressure of the arc-extinguishing gas, the axial center of the fixed electrode 23 fixed to the insulator 22 and the axis of the movable electrode 24 I had a problem with my mind being out of sync. If these axes are misaligned,
When the movable electrode 24 is fitted to the fixed electrode 23, the tube-shaped fixed contact 25 of the fixed electrode 23 wears unevenly, causing poor contact, and sometimes making it impossible to open and close. In cases where the gas pressure of the arc-extinguishing gas to be filled is high, a reinforcing material is welded to the wall of the enclosure 21, but this operation becomes complicated.

The present invention was devised in view of these conventional problems, and it eliminates the occurrence of axis misalignment even when the internal gas pressure of the sealed container fluctuates, and also improves the overall structure of the switch. The purpose is to make it smaller.

[Means to solve the problem]

In order to achieve this purpose, the gas switch of the present invention has a bushing portion in which a fixed electrode is buried, and an insulating tube that surrounds an arc drive coil and a movable contact and is provided with a movable electrode that holds the movable contact on the upper end surface. and a flange formed on the outer periphery of the bushing part are integrally molded with insulating resin so that their axes coincide, and the inner periphery of the burring hole provided in the side wall of the enclosure and the outer periphery of the insulating mold The flange of the insulating mold is fixed to the side wall of the enclosure by interposing an O-ring in the gap between the flange and the flange of the insulating mold.

[Effect]

In the present invention, a fixed electrode is molded with an insulating resin such as epoxy resin to form a bushing portion that ensures gas sealing and high voltage insulation. Furthermore, an insulating resin is formed into a cylindrical shape at the mounting part of the fixed contact, and this is extended toward the opposite side of the bushing to form an insulating cylinder. hold the part,
An upper terminal and a movable electrode are attached to the end face of the cylinder. This forms the main contact portion in the insulating tube.

In this way, the bushing part and the main contact part are integrated using insulating resin, and the flange surface protruding from the bushing part is used as the mounting surface of the integrated unit, which is passed through from the surface of the enclosure into the enclosure, and an O-ring for sealing is inserted. It is implemented by intervening.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

FIG. 1 is a sectional view showing a state in which an integrated unit of a bushing part and a main contact part according to the present invention is installed inside a gas-insulated switch.

In the figure, 1 is a gas switch, 2 is an enclosure containing gas, 3 is an insulating mold made of insulating resin into a cylindrical shape, and 4 is an insert fitting. One end of the insert fitting 4 is formed into a battledore shape and serves as a terminal 4a for connecting a cable direct connection terminal (not shown),
The other end is used as a mounting portion 4b (corresponding to a fixed electrode) of the fixed contact 5. A bushing part A is formed by the insulating mold 3 and the metal insert 4. A cable direct connection terminal is connected to the bushing portion A. The shape of the terminal to which the cable direct connection terminal connects is as follows.
It goes without saying that the connection is not limited to the battledore shape, but can also be connected in a shape to which multiple contacts or tulip contacts can be attached.

3a is a flange surface projecting from the insulating mold 3. The insulating mold 3 becomes cylindrical from the attachment part of the fixed contact 5 to form an insulating tube 3b.

FIG. 2 is an enlarged view showing details of the arc extinguishing section.
In the figure, 6 is a thin cylindrical coil support;
Reference numeral 7 indicates an arc runner made of a conductive thin plate squeezed into a dish shape, and reference numeral 8 indicates a blow coil in which an electric wire such as an enameled wire is wound. The coil support 6, arc runner 7, and blow coil 8 constitute an arc extinguishing section. One end 6a of the coil support 6 is expanded slightly outward from the coil dimensions of the blow coil 8 to increase deformation strength against external forces and to fit into the inner wall 3e of the insulating mold 3. The other end 6b of the coil support 6 is connected to the aperture bottom 7 of the arc runner 7.
By fitting with the outer periphery of b, this portion also increases deformation strength against external force.

The protruding collar 7a of the arc runner 7 is fixed to the inner wall 3f of the insulating mold 3 with a pan head screw 16. A blow coil 8 is wound around the cylindrical outer peripheral surface of the coil support 6 via an insulating film 15, and one end is electrically connected to the fixed electrode 4 and the other end is electrically connected to the collar 7a of the arc runner 7.

Reference numeral 9 denotes an upper terminal, which is fixed with a bolt to an insert (not shown) implanted in the end surface 3d of the insulating tube 3b. 10 is a movable contact, and 11 is a movable electrode. The entire component parts installed in the insulating cylinder 3b are referred to as the main contact part B. The whole unit of the present invention, in which the bushing part A and the main contact part B are integrally formed with an insulating mold 3 with their axes aligned with each other, and a flange surface 3a is provided on the outer periphery, is referred to as an integrated unit U.

The integrated unit U is inserted through an O-ring 12 into a burring hole 2a made in a thin-walled enclosure 2.
It is attached using the flange surface 3a as a mounting surface. A packing 13 is placed between the flange surface 3a and the enclosure 2, and the flange surface 3a is pressed and fixed with a presser metal fitting 14.

Gas sealing is performed using an O-ring 12 and an insert seal 4c. The packing 13 serves both as a buffer against the pressure of the flange surface 3a and as a waterproofing for the O-ring 12.

FIG. 1 shows an open state in which the movable contact 10 is separated from the fixed contact 5. The progress of the integrated unit U from the current interrupting operation to the arc extinguishing operation is as follows. As shown in FIG. 1, when the movable contact 10 is pulled up and separated from the fixed contact 5, the arc C generated between the fixed contact 5 and the movable contact 10 moves to the arc runner 7.
A current path is formed from the insert fitting 4 to the blow coil 8 to the arc runner 7, and the arc is driven to rotate by the arc current passing through the blow coil 8, leading to arc extinguishment.

[Effect of idea]

As explained above, in the present invention, since the main contact part and the bushing part are integrated with an insulating mold and fixed to the container of the switch, the following effects are achieved.

Since no axial misalignment occurs between the movable contact and the fixed contact, opening and closing can be ensured without causing poor contact.

An integrated unit in which the bushing part and the main contact part are integrally formed by insulating molding can be easily mounted because the mounting is only on the flange surface of the bushing part.

Since the arc-extinguishing section is held within the insulating tube, the thick-walled insulating tube coil support and the thick-walled disk-shaped fixed electrode that support it, which were necessary in the configuration of the conventional arc-extinguishing section, are no longer required. becomes unnecessary.

The insulating cylinder that holds the main contact part is cylindrical,
Due to its high rigidity, the thickness of the insulation mold can be made thinner and slimmer than before.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an arc extinguishing part, and FIG. 3 is an explanatory view showing an example of the structure of a conventional gas switch. 1...Gas switch, 2...Enclosed container, 2a...
Burring hole, 3... Insulation mold, 3a... Flange surface, 3b... Insulating tube, 3c... Insulating tube inner wall, 3d... End face, 3e... Inner wall, 3f... Inner wall, 4... Insert fitting, 4a ...Terminal, 4b
... Mounting part (fixed electrode), 4c ... Insert seal, 5 ... Fixed contact, 6 ... Coil support,
6a... One end, 6b... Other end, 7... Arc runner, 7a... Flange, 7b... Bottom surface, 8... Blow coil, 9... Upper terminal, 10... Movable contact, 11... Movable electrode, 12...O ring, 13
...Packskin, 14...Press metal fitting, 15...Insulating film, 16...Known screw.

Claims (1)

[Scope of utility model registration request] A bushing part A in which a fixed electrode 4b is embedded, and a movable electrode 1 that surrounds the arc drive coil 8 and the movable contact 10 and holds the movable contact 10 on the upper end surface.
An insulating mold 3 is formed by integrally molding the insulating cylinder 3b with the insulating cylinder 3b attached with the insulating tube 3b and the flange 3a formed on the outer periphery of the bushing part A with an insulating resin so that their respective axes coincide with each other, and is provided on the side wall of the enclosure container 2. A gas characterized in that the flange 3a of the insulating mold 3 is fixed to the side wall of the enclosure 2 by interposing an O-ring 12 in the gap between the inner periphery of the burring hole 2a and the outer periphery of the insulating mold 3. switch.