JPH0220742Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an arc rotating type gas shield and disconnector. The rotating arc type gas shield disconnector extinguishes the arc by rotating the arc, and is provided with an iron core to strengthen the magnetic flux for rotating the arc and to effectively act on the arc.

FIG. 1 shows one example, in which a sealed insulating container 1 is filled with an arc-extinguishing gas 2 such as SF6 gas. Inside the container 1, an electrode 3 is provided which passes through the container 1 in an airtight manner to establish an electrical connection with the outside. The electrode 3 is composed of a central protrusion 32 serving as a main current conducting path and a coil current conducting path 33.
The coil current path 33 includes a flat iron core 4, a drive coil 5,
An arc runner 6 is fixed, and a fixed contact 7 is pressed by a ring-shaped contact pressure spring 8 to a central protrusion 32 that serves as a main energizing path. Further, an iron core 9 for guiding magnetic flux is screwed onto the central protrusion 32. When the movable contact 10 is turned on, it comes into contact with the fixed contact 7 to form a main circuit. The arc runner 6 causes the arc to move from 11a to 11b by breaking, and also commutates the circuit current to the drive coil 5 to generate magnetic flux, thereby causing the arc 1
Rotate 1b until it disappears. The iron core 9 strengthens the magnetic flux of the drive coil 5 and effectively prevents the arc 11.
It has the role of acting on b.

The insulating cover 12 has the function of preventing short-circuiting of the drive coil 5 due to arc contacting the iron core 9, and is fixed by a stop pin 13 passing through the iron core 9.
Further, the flat iron core 4 prevents loss of magnetic flux caused by the drive coil 5 and also serves as a stopper for preventing movement of the fixed contact 7.

Therefore, in the above configuration, when the insulating cover 12 (usually made of Teflon) is exposed to arc heat when the insulation is cut off, decomposed gas is generated, which causes the insulating cover 12 to
Precipitates on the inside (core side). Then, the pressure between the inside of the insulating cover 12 and the iron core 9 increases, so that the insulating cover 12 tends to separate from the iron core 9. For this reason, the insulating cover 12 can be fixed with the conventional retaining pin 13.
If the pin 13 is fixed, the fixing pin 13 may be damaged, etc.
It was not practical as a fixing means.

In view of the above points, the purpose of this proposal is to prevent the insulating cover from separating from the iron core.

The present invention will be explained below based on an embodiment shown in FIG. In the figure, reference numeral 3 is an electrode, and a support claw 3b for caulking is integrally formed at the tip of the central protrusion 3a. A fixed contact 7 is brought into contact with the outer periphery of the central protrusion 3a to constitute a main current conducting path. Otherwise, the same reference numerals as in FIG. 1 indicate the same or corresponding parts.

To construct the above-mentioned device, first, as shown in FIG. The nails 3b are crimped to hold and fix the stepped portion 12a of the insulating cover 12. The attachment of the fixed contact 7, drive coil 5, etc. is the same as in the conventional case. . The arc extinguishing function is also the same as that in FIG.

As detailed above, according to the present invention, the iron core screwed onto the electrode is covered with an insulating cover and fixed as a temporary fixation by caulking it with a support claw provided at the tip of the central protrusion of the electrode, so it is not strong. Yes, the insulation cover will not come off from the iron core. Furthermore, even if vibrations are applied during the shear cutting operation, there is no risk of the iron core loosening and coming out, providing extremely practical effects.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the main part of a conventional device, Fig. 2 a is a longitudinal cross-sectional view of the main part showing one embodiment of the present invention, and b is a longitudinal cross-sectional view of the main part to explain the installation of the iron core and insulation cover. It is. 3... Electrode, 3a... Central protrusion, 3b... Support claw, 9... Iron core, 12... Insulating cover, 12a
...Danbe.

Claims (1)

[Scope of utility model registration request] An airtight container filled with arc-extinguishing gas, a pair of contacts installed in the container that can be moved in and out, and an arc generated between the contacts that is guided to an arc runner and imparts magnetic flux to the arc. an iron core that guides the magnetic flux of the driving coil to the arc; an insulating cover that covers the iron core; and a central protrusion that is brought into contact with one end of one of the pair of contacts. an arc rotating type gas shield, characterized in that the iron core is screwed onto the electrode, and the insulating cover is fixed by caulking with a support claw provided at the tip of a central protrusion of the electrode. Disconnector.