JPH0112345Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a snow-resistant salt insulator for electric lines in salt-damaged areas with snow accumulation.

Generally, in electric lines in salt-affected areas, when the surface of the insulator becomes wet and contaminated and the surface leakage current increases, spark discharge occurs and ignites the insulating cover of the live part, causing the fire to spread, and tracking occurs in the insulating coating of the electric wire. Conventionally, in order to prevent moisture contamination inside the shade and suppress surface leakage current, it shortens the life of the electric wire and impairs the safety of the electric line.
As shown in FIG.
A tension insulator 11 and a pin insulator 21 attached to 3 were attached.

However, on the other hand, this salt-resistant plate has the disadvantage that flying objects adhere to it and dust accumulates on the opposing surface, which tends to cause an unexpected deterioration in the insulation of the entire insulator, and that the insulator becomes heavy. Additionally, if a lightning surge enters the line and causes a flashover in the insulator, the gap between the main insulator and the salt pan becomes a discharge path, and the inside of the shade is exposed to the arc emitted from the metal fittings, damaging the main insulator. I had something to do. Furthermore, in areas with heavy snowfall, snow accumulates on salt-resistant plates, shielding them from sunlight and wind, and there is a risk that the salt-resistant plates and main insulators will be damaged due to volume expansion during freezing.

In view of these circumstances, the present invention provides an insulating shield layered between the cylindrical bodies of the main insulator, which is more effective in suppressing surface leakage current and has excellent arc resistance. The object of the present invention is to provide a snow-resistant salt insulator that is also safe against snow damage in snowy areas.

In order to achieve this purpose, the snow salt insulator of the present invention has at least two cylindrical bodies 1 of different diameters arranged concentrically.
A main body insulator 1 in which a shade 1ab formed by closing the caps 1a and 1b at one end is integrally formed on a rod portion 1c, and an insulator in which a cap-shaped metal fitting 2 is fixed to the rod portion 1c protruding toward the opening side of the main insulator 1. , the cylindrical body 1a, 1 of the hat
This is characterized in that an insulating shield 3 having a cylindrical body portion 3a inserted and disposed so as to overlap in the gap between the cap-shaped metal fittings 2 is attached to the cap-shaped metal fitting 2.

To explain the present invention in detail with reference to the illustrated embodiment, FIG. 1 shows an example of the implementation of the present invention using a solid tension insulator.
A and 1b are arranged concentrically and a shade 1ab with one end closed is formed integrally with a rod part 1c. An ear-locking portion 2 is provided at the end of the rod portion 1c.
The mounting brackets 2 provided with a are fixed by cementing portions 2b. Reference numeral 3 denotes an insulating shield, which is made of an elastic insulating material such as synthetic rubber or synthetic resin, and has a cylindrical portion 3a and a bottom portion 3b.
It is formed into a bowl shape having a through hole 3c in the bottom part 3b, and the cylindrical part 3a is inserted into the inside 1d of the shade 1ab of the main insulator 1,
It is arranged so as to overlap between the cylindrical bodies 1a and 1b, and is fitted into the outer periphery of the mounting bracket 2 with a through hole 3c, and is attached by elastic pressure welding or synthetic resin adhesion. . In order to further improve the shielding effect, an auxiliary shielding part 3d may be provided which is continuous with the cylindrical part 3a and protrudes outward so as to shield the opening of the outermost cylindrical part 1a of the main body. 3
e is a drain hole.

The insulating shield 3 has its cylindrical portion 3a inserted between the cylindrical body 1a on the outer edge of the main insulator 1 and the cylindrical body 1b adjacent thereto from the opening side, and overlaps the cylindrical body 3a.
It is also preferable to arrange it near the inner wall of the cylindrical body 1a at the outer edge, and the same applies when there are three or more cylindrical bodies 1a, 1b, . . . .

FIG. 2 shows an embodiment using a tight-tipped solid insulator.
A cap-shaped metal fitting 2 with a pin metal fitting 2b is fixed to the end of the rod portion 1c opposite to this, and the insulating shield 3 and its attachment are the same as the embodiment shown in Fig. 1. It is.

If the structure of the present invention is installed as a wire support insulator or tension insulator on power transmission and distribution lines in salt-damaged areas with snow, the shade 1ab of the main insulator 1 can be used.
Since an insulating shield 3 is provided inside the cylindrical bodies 1a and 1b at a predetermined interval and overlapped with each other from the opening side, the shade 1ab of the main body insulator 1 located deeper than the inner surface of the insulating shield 3 is The interior 1f is completely shielded from dust and rainwater. In addition, the outer cylindrical body 1a is designed to protect against the scattering of rainwater during typhoons.
In the narrow gap between the cylindrical portion 3b of the insulating shield 3 and the insulating shield 3, sprayed rainwater adheres to the wall surface and turns into water droplets, falling and flowing to the outside, so that excellent protection against moisture stains can be maintained. In addition, since the opening of the insulating shield 3 is completely hidden inside the shade 1ab of the main insulator 1, there is no possibility of dust accumulating or flying objects adhering to the insulating shield 3, and snow accumulation Since snowfall does not accumulate inside the salt pan even when the salt pan is in use, there is no chance of unexpected insulation deterioration or damage.

Furthermore, by forming the insulating shield 3 from synthetic rubber or synthetic resin, there is an advantage that it can be made lighter in weight and more compact.

In other words, the snow-resistant salt insulator of the present invention exhibits a smooth fluid curve as a whole, so that deposits and snow accumulation on the main insulator and salt-resistant plate are effectively removed by natural conditions such as wind, rain, and sunlight. be excluded.

In addition, if the insulator flashes over due to a lightning surge, the inside of the main insulator's shade and the inside of the insulating shield form a circuitous path and are reinforced with insulation, so the discharge will bridge the outer edge. do. Therefore, since there is no inward arc induction, fatal damage to the main body insulator and the insulating shield can be avoided.

As is clear from the above description, the snow-resistant salt insulator of the present invention has an insulating shield placed inside the shade of the main insulator, overlapping the cylindrical body, and has an excellent effect of preventing deposits and accumulated snow from entering the inside. As a result, it has a long-term reliability due to its excellent salt shielding effect, suppressing surface leakage current, preventing the accumulation of flying objects, dust, and snow, and arc resistance, not only in general salt-damaged areas but also in salt-damaged areas with snowfall. It is of great practical value as it can provide a snow-salt insulator with high snow resistance, is effective in reducing weight, and contributes to the safe supply of electricity.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing the first embodiment of the snow-resistant salt insulator of the present invention, Fig. 2 is a partially cutaway front view showing the second embodiment of the present invention, and Fig. 3 is a partially cutaway front view showing the first embodiment of the snow-resistant salt insulator of the present invention. FIG. 4 is a partially cutaway front view showing an example of an insulator, and FIG. 4 is a partially cutaway front view showing another example of a conventional insulator. 1...Body insulator, 1a, 1b...Cylindrical body, 1
ab...Shade, 2...Mounting bracket, 2a...Ear hook,
2b... Cementing part, 3... Insulating shield,
3a...Cylinder part.

Claims (1)

[Claims for Utility Model Registration] 1. A main body insulator 1 in which a shade 1ab formed by concentrically arranged at least two cylindrical bodies 1a and 1b of different diameters and closed at one end is integrally molded on a rod part 1c; In an insulator in which a cap-shaped metal fitting 2 is fixed to the rod portion 1c protruding toward the opening side of the main insulator 1, a cylindrical portion is inserted and disposed so as to overlap into a gap between the cylindrical portions 1a and 1b of the hat. A snow-resistant salt insulator characterized in that an insulating shield 3 having a diameter 3a is attached to the cap-shaped metal fitting 2. 2. The insulating shield 3 is a utility model in which an auxiliary shield 3d is provided at the base of the cylindrical part 3a and protrudes outward from the cylindrical part 3a so as to shield the open end of the outermost cylindrical part 1a of the shade of the main insulator. Scope of registration claims No. 1
Snow-resistant salt insulators as described in section.