JPS6364220A - Compound insulator - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a composite insulator used as a tension insulator for supporting power transmission lines, for example.

(Prior Art) Conventionally, there has been a composite insulator shown in Japanese Patent Publication No. 59-38684. This is the FRP as shown in Figure 5.
A retaining metal fitting 2 is attached to both ends of the tension-resistant insulating rod 21.
2 are fitted and fixed with cement, and a jacket 23 made of an insulating material such as resin is molded around the outer periphery of the tensile insulating rod 21.

Further, as a conventional composite insulator, there is one shown in Japanese Patent Publication No. 4272/1983. As shown in FIG. 6, a porcelain jacket 25 is placed around the outer periphery of the tension-resistant insulation rod 21 of the conventional composite insulator through a flexible filling 24 such as asphalt.
are mated.

(Problems to be Solved by the Invention) However, since the outer sheath 23 of the former composite insulator is made of an organic material, the outer sheath 23 may deteriorate due to ultraviolet rays, or the outer sheath 23 may deteriorate due to leakage current. Tracking occurs on the outer surface, and the arc resistance is low when flashing due to contamination or lightning surges, which poses problems for outdoor use.Furthermore, the pressing strength of the sub-parts is low, so the durability during handling is poor. There was a problem.

In addition, since the latter composite insulator has a porcelain jacket 25 fitted and fixed, weather resistance and arc resistance are improved, but heat shrinkage due to changes in temperature between the tensile insulating rod 21 and the jacket 25 increases. - Due to the difference in expansion rate, the gap between the packing 26 interposed between the outer sheath 25 and the retaining metal fitting 22 changes, resulting in a decrease in airtightness, which causes moisture to enter the filling 24, resulting in a decrease in insulation. There is a problem. Furthermore, when manufacturing the integral outer cover 25, the sub-portion 25a is manually formed using the current manufacturing technology, so the thickness of the sub-portion 25a must be increased.
The weight of 5 is large, making it difficult to manufacture, and the pillar installation work -F
There's a problem.

An object of the present invention is to provide a composite insulator that solves both the former problem and the latter problem.

1R formation in month B (Means for solving the problem) In order to solve the problem mentioned in 1-1, the present invention provides a method for solving the problem described in 1. On the other hand, the connecting fitting is fitted and fixed, and a single sub-portion is integrally formed on the outer periphery of the tension-resistant insulation rod or tension-resistant insulation tube through a layer of elastic adhesive such as hardened silicone rubber. A large number of sheathing units are stacked, an elastic material such as low hardness rubber is interposed and bonded between each sheathing unit, and a protective layer such as ceramic coating or metallicon is provided around the outer periphery of the elastic material. An elastic adhesive layer such as the above-mentioned hardened silicone rubber is interposed and bonded between the outer cover unit and the connecting fitting.

(Function) By adopting the above-mentioned means, the present invention functions as follows.

The difference in expansion and contraction due to heat between the tension insulating rod or the tension insulating tube and the jacket unit is absorbed by the elastic adhesive layer and the elastic material. Each sheathing unit is made of porcelain, and since there is an elastic protective layer at the joint of each sheathing unit, weather resistance is improved, which also improves airtightness. Furthermore, since only one sub-portion is formed in each outer cover unit, the outer cover can be press-molded in a uniform manner, and the thickness of the sub-portion can be reduced to reduce weight.

(Example) Hereinafter, an example embodying the present invention will be described with reference to FIGS. 1 to 3.

Connecting fittings 2.3 are fitted to both upper and lower ends of the tensile insulating rod 1 made of an organic material such as FRP, and are caulked at caulked portions 2a and 3a.

On the outer periphery of the tensile insulating rod 1, there are a large number of sheathing units 4 to 1 which are press-molded in advance from an insulating and weather-resistant inorganic material such as 2,1-ceramic (silicon thioside, partially stabilized zirconia) or porcelain. 4 are stacked in series, and the tensile insulating rod 1 and the jacket unit 4 are bonded together by an elastic adhesive layer 5 such as hardened silicone rubber. The elastic adhesive layer must follow the difference in deformation between the tension insulating rod and the sheathing unit and not cause cracks, so the thickness in the radial direction is determined based on the amount of deformation so that the generated stress is below the allowable value. Must be decided. Each jacket unit 4-4 is each provided with one sub-part 4a to enable press molding. Further, an elastic material 6 such as low hardness rubber is interposed in the gap between each of the outer sheath units 4 to 4, so that the tension resistance 1! It absorbs the variation in the gap due to the difference in thermal expansion between the insulation rod 1 and the sheathing units 4 to 4, and the difference in expansion and contraction due to mechanical loads, so that no abnormal stress is applied to the tensile insulation rod 1 or the sheathed units 4 to 4. That's what I do.

On the outer periphery of the elastic material 6, an elastic material protective layer 7, such as a ceramic coating or a metal metallic compound, is formed. In the case of conductive metals, current flows, so
Tracking is prevented and its deterioration is suppressed. Further, since the width of one elastic member 6 is 0.5 to 1, Q mm, a decrease in the creeping insulation distance as a whole poses almost no problem.

On the other hand, the uppermost and lowermost sheathing units 4 and connecting fittings 2.
An adhesive 8 such as a rubber adhesive or a hardened rubber is applied to the open end between the openings 3 and 3 to provide airtightness and prevent a decrease in insulation inside the jacket unit. The outer circumferential surface of the tensile insulation rod 1, the inner circumferential surface of the sheathing units 4 to 4, and the units 4
The joint end surfaces of units 4 to 4 are treated with a primer before assembly, and then an adhesive 9 is applied, and a tensile insulation layer 1 is applied to the unit 4.
- 4 and the elastic adhesive layer 5 are improved in adhesiveness.

Next, the operation of the composite insulator constructed as described above will be explained.

When the composite insulator is used in a power transmission line, tension acts on the tensile insulating rod 1 and hardly acts on the jacket unit 4. Further, even if expansion and contraction occur due to heat and relative movement occurs between the tensile insulating rod l and the sheathing unit 4 due to a difference in their thermal expansion coefficients, the elastic adhesive layer 5 is interposed between them.
Since an elastic material 6 such as low hardness rubber is interposed between each outer sheath unit 4, the above-mentioned relative movement is allowed, and the tension-resistant insulating rod l
, no unreasonable stress is applied to the sheathing units 4 to 4, and therefore each member is prevented from breaking.

Moreover, since the elastic material protection layer 7 is adhered to the outer circumferential surface of the elastic material 6 between each jacket unit 4, the elastic material 6 is secured from tracking due to leakage current.

Furthermore, each outer cover unit 4 to 4 has one cap 4 .
Since it only has a, the outer cover unit 4 can be press-molded, and the thickness of the cap part 4a can be made as thin as necessary to reduce the weight of the outer cover units 4 to 4. , the weight of the entire tension insulator can be reduced.

Since the outer sheathing units 4 to 4 are made of weather-resistant and arc-resistant materials such as new ceramics or porcelain, they will not deteriorate due to ultraviolet rays, and will not suffer from creeping flash in the composite insulator due to lightning strikes. It is also possible to suppress burnout on the insulator surface.

Note that the present invention can also be embodied as follows.

Providing a thin film of insulating compound such as silicone grease without bonding between the tension-resistant insulating rod and the elastic adhesive layer.

In this case, if the tension insulating rod has a special specification and has a large elongation and the elastic material 6 and the elastic adhesive layer cannot absorb this deformation, the structure can be simplified.

As shown in FIG. 4, the end surfaces of each of the outer cover units 4 to 4 are formed obliquely. In this case, since it is wedge-shaped, the elastic material 6 at the joints of the outer sheath units 4 to 4 is likely to deform, which improves its ability to absorb expansion and contraction, and also increases the length of the adhesive. Airtightness is also improved.

The elastic adhesive layer 5 also serves as the elastic material 6. In this case, a jig is required to keep the spacing between the sheathing units 4 constant during assembly, but the overall structure can be simplified.

Effects of the Invention As detailed above, the present invention absorbs the difference in expansion and contraction caused by heat between the tension insulating rod or the tension insulating tube and the jacket unit by using the elastic adhesive layer, thereby reducing stress in each member. Durability can be improved by eliminating concentration. Furthermore, since each outer sheath unit is made of porcelain and there is an elastic protective layer at the joint of each outer sheath unit, weather resistance and airtightness are improved.

Furthermore, since only one cap is formed on each sheathing unit, the sheathing unit can be press-molded, the thickness of the cap can be made thinner, and the weight can be reduced. This has the effect of making pillar work easier.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part embodying an embodiment of the present invention;
2 is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a front view showing the entire tension insulator, FIG. 4 is a partial sectional view showing another example of the present invention, and FIGS. 5 and 6. 1 is a longitudinal sectional view showing a conventional example. 1...Tension-resistant insulation rod, 2.3...Connection fittings, 4...
Outer cover unit, 4a...Shade part, 5...Elastic adhesive layer, 6...Elastic material, 7...Elastic material protective layer, 8.9.
··glue.

Claims (1)

[Claims] 1. Connecting fittings are fitted and fixed to both ends of a tension insulation rod or tension insulation tube made of an organic material such as FRP, and
A large number of porcelain jacket units each having a single cap part integrally formed with a layer of elastic adhesive such as hardened silicone rubber are laminated around the outer periphery of a tension-resistant insulation rod or tension-resistant insulation tube. An elastic material such as low hardness rubber is interposed and bonded between the outer sheath units, and a ceramic coating or a protective layer of elastic material such as metallic metal is provided on the outer periphery of the elastic material, and the outer sheath units and connecting fittings located at both ends are bonded together. A composite insulator characterized in that an elastic adhesive layer such as the above-mentioned cured silicone rubber is interposed and bonded between the layers. 2. The composite insulator according to claim 1, wherein the gap between each jacket unit is oblique.