JPH09259666A - Insulator having core body of reinforced plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce polymer insulators with high buckling strength and make the insulators withstand excess compression load. SOLUTION: In a polymer insulator comprising a core body 10a made of a reinforced plastic and produced by impregnating a core material, which is produced by coiling a continuous string along the grooves 11c formed in the outer circumferences of a pair of bushes 11 held on the opposite to each other at a prescribed distance, with synthetic resin and curing the resultant core material and an insulating coating body 13 coating the outer circumference of the core body 10a, a reinforcing member 14 extended in the longitudinal direction is put along the core body 10a to reinforce the buckling strength of the core material 10a and, as a whole, to provide the polymer insulator with high buckling strength.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an insulator having a reinforced plastic core.

[0002]

2. Description of the Related Art Generally, an insulator having a reinforced plastic core is known as a so-called polymer insulator or a plastic insulator, and one type thereof is described in, for example, US Pat. No. 5,406,033. Like
Made of reinforced plastic formed by impregnating a core material formed by winding continuous yarns between a pair of bushes facing each other at a predetermined interval along a groove provided on the outer circumference of the bush with synthetic resin and curing There is an insulator having a core body made of reinforced plastic, which has an insulating coating body made of an elastic material and covering the outer periphery of the core body.

This type of insulator (hereinafter sometimes referred to as polymer insulator) has high tensile strength and
Compared to a porcelain insulator, it has excellent impact resistance and is lightweight, so it has an advantage of being excellent in handling such as transportation work and mounting work. On the other hand, in the polymer insulator, a predetermined length is required to withstand a predetermined rated voltage, and the higher the rated voltage specification is, the longer the structure becomes. However, as the length increases, the buckling will occur. The intensity gradually decreases.

[0004]

By the way, in the polymer insulator, a compressive load is applied due to the swing of the electric wire in the electric line, but when the insulator length is long and the compressive load acting is excessive, it is compressed. The load exceeds the buckling strength, buckling failure occurs in the polymer insulator due to the action of compressive load,
Alternatively, there is a possibility that a peeling phenomenon between the core body and the insulation coating body may be induced to cause insulation deterioration due to water immersion or the like.

Therefore, the object of the present invention is to sufficiently withstand an excessive compression load not only when the insulator length is short but also when the insulator length is long in the polymer insulator of the type. It is to provide a polymer insulator.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a core material formed by winding continuous yarns between a pair of bushes which face each other at a predetermined interval along a groove formed on the outer circumference of the bush. Insulator having a reinforced plastic core body comprising a reinforced plastic core body formed by impregnating a synthetic resin and curing, and an insulating coating body made of an elastic material for coating the outer periphery of the core body, wherein A reinforcing member extending in the longitudinal direction along the core body is interposed in the covering body.

In an insulator (polymer insulator) having a reinforced plastic as a core according to the present invention, one or two plate-shaped reinforcing members having a predetermined length are adopted as the reinforcing member, and the reinforcing member is A structure arranged along the outer side surface of the core body, a structure in which the reinforcing member is arranged in a state in which the respective tip portions of the reinforcing member are fitted in the bushes, and a plate shape having a predetermined length as the reinforcing member It is possible to adopt a configuration in which the two reinforcing members are adopted, the reinforcing members are arranged along the outer side surfaces of the core body, and the reinforcing members are connected to each other at their intermediate portions.

Further, in the polymer insulator, a rod-shaped reinforcing member having a predetermined length is adopted as the reinforcing member,
The reinforcing member is arranged in the inner region of the core body between the bushes, and a reinforcing member having a fitting protrusion at each tip is adopted as the reinforcing member. The configuration is such that the fitting protrusions of the above are arranged in a state of being fitted in the groove of each bush, and a reinforcing member having an arc-shaped fitting recess at each tip is adopted as the reinforcing member, The member may be arranged such that the fitting recesses of the reinforcing member are fitted in the groove portions of the bushes.

[0009]

In the polymer insulator constructed as described above, the reinforcing member interposed in the insulating coating body complements the buckling strength of the core body to provide a large buckling strength as a whole. Therefore, not only when the polymer insulator is short, but also when the polymer insulator is long, it can sufficiently withstand an excessive compression load. In particular, by selecting and adopting a reinforcing member having different rigidity according to the insulator length, the buckling strength of the polymer insulator is suitable for the specifications.

Further, in the polymer insulator, the buckling strength of the polymer insulator can be further adapted to the buckling strength that meets the specifications by appropriately selecting and adopting the above-mentioned various structures according to the insulator length. .

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an example of a polymer insulator according to the present invention. The polymer insulator is an insulator having a reinforced plastic as a core body, and includes a pair of bushes 11 forming a core body 10a and a core material 12 including continuous yarns.
And an insulating cover 13 and a pair of reinforcing members 14.

Each bush 11 forming the core body 10a is made of a metal having a cylindrical shape, and a pair of outward flange portions 11b are provided on the outer circumference of the cylindrical portion 11a, and the outer circumference between both flange portions 11b is large. It is formed in the annular groove 11c. In the core body 10a, glass fibers, monofilaments such as synthetic fibers, multifilaments, and various fibers are spun along the annular grooves 11c of the bushes 11 in a state in which the bushes 11 are opposed to each other with a predetermined gap therebetween. It is formed by winding a continuous yarn made of a thread or the like a number of times to form a bundle, and impregnating the continuous yarn in the bundle with a synthetic resin such as an epoxy resin or an unsaturated polyester resin and curing the resin.

Therefore, the core 10a is an elliptic fiber reinforced plastic having a core material 12 which is a continuous filament in a bundle formed by impregnating and curing a synthetic resin such as an epoxy resin or an unsaturated polyester resin. It is endless and has a so-called race track shape. Core body 1 having such a configuration
0a includes a reinforcing member 14 in a fork-like shape along both outer side surfaces thereof.
Are arranged and covered with the insulating coating 13 in this state.

The reinforcing member 14 is made of a synthetic resin having an elongated plate shape with a predetermined width, and the plate-shaped main body 14a is formed slightly narrower than the width of the core material 12 constituting the core body 10a. A circular mounting hole 14b for fitting on the outer circumference of the tubular portion 11a of each bush 11 is formed at each tip of the plate-shaped main body 14a. Each reinforcing member 14 has a cylindrical portion 11 of each bush 11 in which each mounting hole 14b is formed.
It is attached to each bush 11 in a state of being fitted to the end portion on the outer periphery of a, and is connected to each other at the intermediate portion of each reinforcing member 14 via a connecting pin 14c.

The insulating coating 13 is made of an elastic material such as silicone rubber or ethylene-propylene rubber, and has a cylindrical portion 13a for covering the entire outer circumference of the core 10a and a cylindrical portion 1.
A plurality of umbrella portions 13b protruding outward at the side portions of the outer periphery of 3a
It is composed of The insulating coating 13 is integrally molded with the core 10a in a state where the core 10a integral with the reinforcing member 14 is housed in a predetermined molding die. Synthetic rubber, which is a forming material of 13, penetrates between the reinforcing members 14 and is also filled in the internal space between the core materials 12 constituting the core body 10a. The internal space between the core materials 12 is a synthetic rubber filler 13c. The structure is filled with.

The polymer insulator thus constructed is
The core body 10a and both reinforcing members 14 have high tensile strength, and at the same time, the core body 10a and both reinforcing members 14,
Since it is excellent in impact resistance and lightweight due to the insulating cover 13, it is excellent in handling such as transportation work and mounting work. However, since both reinforcing members 14 are interposed, both reinforcing members are provided. 14 complements the buckling strength of the core body 10a and has a large buckling strength as a whole.

Therefore, the polymer insulator can withstand not only a short length but also a long length, and an excessive compressive load. In particular, if a reinforcing member having different rigidity depending on the length of the insulator is used as the reinforcing member 14, the buckling strength of the polymer insulator can be made appropriate according to the specifications.

The plate-shaped reinforcing member 14 has
If the through-holes are appropriately provided and the insulating cover 13 is formed to communicate with the through-holes, the reinforcing member 14 and the insulating cover 13 can be tightly joined and fixed.

3 and 4 show a modification of the polymer insulator. In the polymer insulator of this modification, one circular rod-shaped reinforcing member 1 is used as a reinforcing member.
5 is adopted, and the other constitution is the same as that of the polymer insulator shown in FIGS. 1 and 2.

The reinforcing member 15 employed in the polymer insulator is formed to have substantially the same length as that between the bushes 11, and each bush 11 is provided at each tip of the rod-shaped main body 15a of the reinforcing member 15. A fitting protrusion 15b for fitting into the annular groove 11c is formed. Reinforcing member 15
Each of the fitting protrusions 15b into the annular groove 11 of each bush 11.
In the state of being fitted to c, the core material 12 is inserted between the bushes 11.
It is installed in the inner area of.

Therefore, in the polymer insulator, since the reinforcing member 15 is particularly interposed, the reinforcing member 15 complements the buckling strength of the core body 10a and has a large buckling strength as a whole. It can sufficiently withstand an excessive compressive load equal to or higher than that of the polymer insulator shown in FIG.

FIG. 5 shows a modification of the polymer insulator shown in FIGS. 3 and 4. In the polymer insulator of this modified example, one rod-shaped reinforcing member 16 having a quadrangular cross section is adopted as the reinforcing member, and the other configurations are the same as those of the polymer insulator shown in FIGS. 3 and 4. .

The reinforcing member 16 employed in the polymer insulator is formed to have substantially the same length as that between the bushes 11, and each bush 11 is provided at each tip of the rod-shaped body 16a of the reinforcing member 16. A fitting protrusion 16b for fitting in the annular groove 11c is formed, and a support portion 16c for supporting the core 12 is formed in the intermediate portion. The reinforcing member 16 includes the fitting protrusions 16b.
Is fitted into the annular groove 11c of each bush 11,
It is interposed between the bushes 11 in the inner space of the core 12, and the core 12 is supported while being inserted into the groove 16c1 in the support 16c.

Therefore, in the polymer insulator, since the reinforcing member 16 is interposed in particular, the reinforcing member 16 complements the buckling strength of the core body 10a and has a large buckling strength as a whole, and the bearing portion 16c. Since the core material 12 is supported by, it can sufficiently withstand an excessive compressive load larger than that of the polymer insulator shown in FIGS. 3 and 4.

FIG. 6 shows a second modification of the polymer insulator shown in FIGS. 3 and 4. In the polymer insulator of this modification, one rod-shaped reinforcing member 17 having a quadrangular cross section is adopted as the reinforcing member, and the other configurations are the same as those of the polymer insulator shown in FIGS. 3 and 4. .

The reinforcing member 17 employed in the polymer insulator is formed to have substantially the same length as that between the bushes 11, and each bush 11 is provided at each tip of the rod-shaped body 17a of the reinforcing member 17. An arcuate fitting recess 17b for fitting into the annular groove 11c is formed. The reinforcing member 17 has the fitting recesses 17b fitted in the annular grooves 11c of the bushes 11 in the respective bushes 1
It is interposed in the inner space of the core material 12 between the two.

Therefore, in the polymer insulator, since the reinforcing member 17 is particularly interposed, the reinforcing member 17
Has a large buckling strength as a whole by supplementing the buckling strength of the core body 10a, but the reinforcing member 17 has a fitting recess 17b provided at each tip thereof, and the annular groove 11 of each bush 11 is provided.
Since it is fitted in c, the connection with each bush 11 is stronger than that of the polymer insulator shown in FIGS. 3 and 4, and the connection is more stable against an excessive compression load. It is kept in the state.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a polymer insulator according to an example of the present invention.

FIG. 2 is a cross-sectional plan view of the insulator.

FIG. 3 is a partially cutaway side view showing a modified example of the insulator.

FIG. 4 is a cross-sectional plan view of the insulator.

FIG. 5 is a partially cutaway side view showing another modified example of the insulator.

FIG. 6 is a partially cutaway side view showing another modification of the insulator.

[Explanation of symbols]

10a ... Core, 11 ... Bush, 11a ... Cylindrical part, 11c
... Annular groove, 12 ... Core material, 13 ... Insulating coating, 13a ... Cylindrical part, 13b ... Umbrella part, 14, 15, 16, 17 ... Reinforcing member, 14a ... Plate body, 15a, 16a, 17a ... Rod body , 14b ... Mounting holes, 15b, 16b ... Fitting protrusions,
17b ... Fitting recess, 14c ... Connection pin, 16c ... Bearing part.

Claims (7)

[Claims] 1. A core material formed by winding continuous yarns between a pair of bushes which face each other with a predetermined space therebetween along a groove provided on the outer circumference of the bushes, impregnated with a synthetic resin and cured. A core body made of a reinforced plastic formed, and an insulator having a core body made of a reinforced plastic comprising an insulating coating body made of an elastic material for coating the outer periphery of the core body, in the insulating coating body, in the core body An insulator having a reinforced plastic core, wherein a reinforcing member extending in the longitudinal direction is interposed. 2. The insulator according to claim 1, wherein one or two plate-shaped reinforcing members having a predetermined length are used as the reinforcing members, and the reinforcing members are provided along the outer surface of the core body. An insulator with a reinforced plastic core that is characterized by being arranged. 3. The reinforced insulator according to claim 2, wherein the reinforcing member is arranged with each tip of the reinforcing member fitted to the tubular portion of each bush. An insulator with a plastic core. 4. The insulator according to claim 1, wherein two reinforcing members in a plate shape having a predetermined length are used as the reinforcing members, and these reinforcing members are provided along each outer surface of the core body. An insulator using a reinforced plastic as a core, characterized in that both reinforcing members are arranged and connected to each other at an intermediate portion. 5. The insulator according to claim 1, wherein a rod-shaped reinforcing member having a predetermined length is adopted as the reinforcing member, and the reinforcing member is arranged in the inner region of the core body between the both bushes. Insulator with reinforced plastic as a core. 6. The insulator according to claim 5, wherein a reinforcing member having a fitting protrusion at each tip is adopted as the reinforcing member, and the reinforcing member is fitted with each fitting protrusion. An insulator using a reinforced plastic as a core, which is arranged so as to be fitted in the groove of each bush. 7. The insulator according to claim 5, wherein a reinforcing member having an arc-shaped fitting recess at each tip is adopted as the reinforcing member, and the reinforcing member is fitted into each fitting member. An insulator using a reinforced plastic as a core, characterized in that a recess is arranged in a state of being fitted in the groove of each bush.