JPH10172367A - Tie top type insulator with core made of reinforced plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tie top type polymer insulator. SOLUTION: A tie top type insulator includes an insulator main body part 10a comprising a core 11 of reinforced plastic covered on its outer periphery with an insulating cover 12 and an insulator head 10b made from an insulating material constituting the head of the insulator, and is used for securing a wire 23, which is placed along an annular grooved part 3b provided in the outer periphery of the insulator head 10b, to the outer periphery of the insulator head 10b by binding it in the grooved part 13b by means of a binding wire 24, the insulator head 10b being designed to have higher hardness than the insulating cover 12. Therefore, a stably supported state is maintained even with the oscillation and vibration of the wire 23, and abrasion of the grooved part 13b is reduced even with the sliding contact of the binding wire 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tie-top insulator having a reinforced plastic core.

[0002]

2. Description of the Related Art A tie-top insulator is provided with an annular groove on the outer periphery of a head of the insulator main body, and an electric wire arranged in the groove of the insulator main body is bound to the groove by a bind wire, and is wrapped around the outer periphery of the insulator main body. Generally, it is fixed.

However, in recent years, even in the field of tie-top insulators, a part of the insulator main body has been used in order to increase the thermal shock strength of the insulator against an arc at the time of flashover of a lightning surge and to reduce the weight to facilitate handling. Attempts have been made to construct all or plastic or plastic and synthetic rubber.

In a tie top type insulator in which a part or the whole of the insulator main body is made of plastic or plastic and synthetic rubber, an electric wire is bound along an annular groove provided on the outer periphery of the insulator main body. When the electric wire supported while the insulator is installed swings and vibrates, the head of the insulator main body has elasticity, so that the stable support state for the electric wire can be maintained. There is a possibility that the binding wire slides on the groove of the head of the insulator main body and the surface of the groove is worn and damaged.

To cope with such a problem, Japanese Patent Laid-Open Publication No.
Japanese Patent No. 2934 discloses that an insulator main body is composed of a main body made of a porcelain material and an insulating covering made of synthetic rubber covering the outer periphery of the main body, and the head of the main body protrudes from the insulating covering. A composite insulator having a configuration in which an annular groove is formed on the outer periphery thereof has been proposed.

[0006]

In the composite insulator having such a structure, the head formed with the groove, which is the fixing portion of the electric wire, is made of porcelain, so that it is stable against rocking and vibration of the electric wire. Even if the binding wire is kept in a proper supporting state and the binding wire slides due to the swinging or vibration of the electric wire, the surface of the groove is not worn and damaged. However, in the composite insulator, since the main portion is made of porcelain, the weight of the insulator is not sufficiently reduced, and the head exposed from the insulating coating still has a problem in terms of thermal shock strength.

In order to solve the problem caused by the main body made of porcelain of the composite insulator, the whole insulator body should be made of plastic or plastic and synthetic rubber, and the insulator body should be made of reinforced plastic. It is conceivable to constitute a tie-top insulator, which is a so-called tie-top polymer insulator, comprising a core and a resilient insulating coating covering the outer periphery of the concentric body.

However, in the polymer insulator, it is necessary to maintain a stable supporting state when the electric wire swings or vibrates, and to protect the groove, which is a fixing portion of the electric wire, from abrasion damage caused by the bind wire or the electric wire. , The head of the insulator body,
It is necessary to fit a metal cap having an annular groove on the outer periphery and cover with the cap. For this reason,
In the polymer insulator, although the weight of the insulator body itself is reduced, the weight of the insulator cannot be sufficiently reduced due to the cap covering the head of the insulator body.

Accordingly, an object of the present invention is to provide a so-called tie-top type polymer insulator, which maintains a stable supporting state when the wire swings or vibrates without increasing the weight of the insulator, and An object of the present invention is to prevent abrasion damage caused by a bind wire or an electric wire in a groove portion as a fixing portion.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a tie-top insulator made of reinforced plastic as a core, and a first tie-top insulator according to the present invention provides an elastic outer periphery of a reinforced plastic core. A main part of the insulator covered with an insulating insulating body and an insulator head made of an insulating material constituting the head of the main part of the insulator are arranged in an annular groove provided on the outer periphery of the insulator head. A tie-top type insulator having a core made of reinforced plastic for binding an electric wire to the groove by a bind wire and fixing the wire to an outer periphery of the insulator head, wherein the insulator head is an insulating coating of the insulator main body. It is characterized by being made of an insulating material having a higher hardness than the body.

A second tie-top insulator according to the present invention comprises an insulator main body formed by covering an outer periphery of a reinforced plastic core with an elastic insulating covering, and a head of the insulator main body. An insulator head made of an insulating material to be constituted, and an electric wire arranged in an annular groove provided on the outer periphery of the insulator head is bound to the groove by a bind wire and fixed to the outer periphery of the insulator head. A tie-top insulator having a reinforced plastic core, wherein an outer periphery of the insulator head is configured to have higher hardness than an insulating covering of the insulator main portion. .

In these tie-top type polymer insulators, the insulator head is formed integrally with the top of the insulator main body, or is formed separately from the insulator main body to form the insulator main body. It can be configured by fitting to the top.

Further, the insulator head is formed of an insulating material having substantially the same hardness as that of the insulating covering of the insulator main body, and a minute hard material mixed in the insulating material. It is possible to adopt a configuration in which the outer peripheral portion is dispersed at the outer peripheral portion of the insulator head and the outer peripheral portion is formed with higher hardness than other portions.

[0014]

In the tie-top type polymer insulator according to the present invention, in the first tie-top type polymer insulator, the hardness of the head in which the groove as the fixing portion of the electric wire is formed is high. In addition, a stable supporting state is maintained even when the wire swings or vibrates, and even if the bind wire slides due to the wire swing or vibration, abrasion damage to the groove is suppressed. In addition, since all the pommer insulators are made of plastic or plastic and synthetic rubber, the insulator can be sufficiently reduced in weight and impact resistance.

Further, in the second tie-top type polymer insulator according to the present invention, the head in which the groove, which is the fixing portion of the electric wire, is formed has a high outer peripheral hardness and an inner insulating coating. Since the hardness of the two parts is equal, the different hardness of these two parts work synergistically to maintain a stable support state against the swing and vibration of the wire, and the binding wire slides due to the swing and vibration of the wire. Also, wear damage of the groove is suppressed. In addition, since all the pommer insulators are made of plastic or plastic and synthetic rubber, the insulator can be sufficiently reduced in weight and impact resistance.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows an example of a tie-top type polymer insulator according to the present invention. The tie-top type polymer insulator (hereinafter sometimes simply referred to as polymer insulator)
Is composed of an insulator main body 10a, an insulator head 10b, and a base fitting 10c. The base fitting 10c is fitted to the lower end of the insulator main body 10a and is caulked and integrated. The insulator head 10b is integrally formed with the upper end of the main body 10a in a state of being fitted thereto.

A mounting bolt 21 is implanted in the base 10c of the polymer insulator. Mounting bolt 21
Protrudes downward from the lower end surface of the base fitting 10c by a predetermined length. The polymer insulator is attached to the arm bar 22 of the utility pole by the mounting bolts 21 and stands on the arm bar 22.

Thus, the insulator main body 10a is
And an insulating cover 12. Core 11
Is a reinforced plastic made by impregnating a monofilament such as glass fiber or synthetic fiber, multifilament, or a bundle of yarns of various fibers with synthetic resin such as epoxy resin or unsaturated polyester resin and curing. Things
It has a predetermined length and a predetermined outer diameter.

The insulating cover 12 is made of a resilient material such as silicone rubber or ethylene-propylene rubber. The body 12a covers the entire outer periphery of the core 11, and a side portion of the outer periphery of the body 12a. And a large number of annular folds 12b protruding outward. Each fold 12b
Are arranged at predetermined intervals in the longitudinal direction of the trunk 12a.

The insulating cover 12 is formed by molding in a predetermined mold. When the insulating cover 12 is formed, the core 11 and the core 11 are provided at predetermined positions in the mold. The base metal 10c fitted and fixed to the lower end portion 11a of the core body 11 is caulked and fixed, and is molded integrally with the base metal body 10c and the core body 11 by molding in this state. In this state, the upper end 11b of the core 11 protrudes from the upper end of the body 12a of the insulating cover 12 by a predetermined length.

As shown in FIG. 2, the insulator head 10b is a cylindrical body 13a whose top is closed, and has an annular groove 13b on the outer periphery thereof.
In the state fitted to b, it is fixed to the outer peripheral surface of the upper end 11b of the concentric body 11, the outer periphery of the upper end of the trunk 12a of the insulating cover 12, and the upper surface of the uppermost fold 12b. .

The insulator head 10b is made of epoxy resin, other hard synthetic resin, hard synthetic rubber, or the like, and has a higher hardness than the insulating cover 12, and has a base. The insulator main body 10a, which is integral with the metal fitting 10c, is housed and arranged at a predetermined position in the molding die, and is molded integrally with the upper end of the insulator main body 10a by molding in this state.

The polymer insulator is, as shown in FIG.
The polymer insulator is provided upright on the arm pole 22 of a utility pole, and supports the insulated wire 23. In the polymer insulator, the insulated wire 23 is disposed along the groove 13b of the insulator head 10b. 23b covering core wire 23a
By binding the bind wire 24 wound around the outer periphery of the groove 13b to the outer periphery of the groove 13b, the insulated wire 23 is fixed to and supported by the insulator head 10b.

In the polymer insulator configured as described above, the hardness of the insulator head 10b in which the groove 13b, which is the fixing portion of the insulated wire 23, is formed, is high. Also maintains a stable support state,
Also, even if the bind wire 24 slides due to the swing or vibration of the electric wire 23, wear and damage of the groove 13b is suppressed.

In addition, in the pommer insulator, the core body 11 of the insulator main body 10a is formed of a reinforced plastic core, the insulating cover 12 is formed of synthetic rubber, and the insulator head 10b is synthesized. Since the insulator is made of resin or synthetic rubber, the weight of the insulator can be sufficiently reduced, and the impact resistance can be sufficiently improved.

FIG. 3 shows a modified example of the insulator head constituting the polymer insulator. The insulator head 10d according to this modification is formed of a raw material in which inorganic fine particles such as porcelain and glass are mixed in a synthetic resin, and the fine particles 14c are scattered around the outer periphery of the cylindrical body 14a. And
The outer peripheral portion of the cylindrical body 14a has a higher hardness than other portions.

The insulator head 10d is formed separately from the insulator main body 10a, and is formed by a forming die 25 shown in FIG. In molding the insulator head 10d, a molding die 2
The molten synthetic resin 14d in which the fine particles 14c are mixed as the raw material is injected into the cavities 25a and 25b.
Then, the mold 25 is cured while rotating the mold 25 about its axis.

As a result, a large number of the fine particles 14c mixed in the raw material move inside the synthetic resin 14d in the molten state to the outer peripheral side of the cavities 25a and 25b by the centrifugal force, and are dispersed and formed. The cylindrical body 14 in the head 10d
A high hardness is given to the outer peripheral portion of a.

The molded insulator head 10d is fitted to the upper end 11b of the core 11 constituting the insulator main body 10a, and is fixed to the upper end 11b and the upper end of the insulating cover 12 with an adhesive. Alternatively, the insulating cover is integrally molded in a state of being fitted to the upper end portion 11b of the core body 11, thereby being fixed to the insulator main body portion 10a, thereby forming a polymer insulator.

In the polymer insulator having such a configuration, the insulator head 10d in which the groove 14b, which is the fixing portion of the insulated wire 23, is formed, has a high outer peripheral hardness and a low internal hardness. The different hardnesses of the inner and outer parts work together to maintain a stable support state against the swing and vibration of the electric wire 23, and even if the bind wire 24 slides due to the swing and vibration of the electric wire 23, the groove portion In addition to suppressing the wear damage of the insulator 14b, it is possible to reduce the external impact to the inside of the insulator. In addition, as a matter of course, the weight of the insulator can be sufficiently reduced, and the impact resistance can be sufficiently improved.

In the formation of the insulator head 10d,
If a metal material such as an aluminum alloy is used as the microparticles 14c to be used, the supporting portion of the insulated wire 23 will be slightly conductive, but a shielding effect will be generated at the portion. For this reason, even in facility areas where insulators are heavily polluted,
This has the effect of preventing electromagnetic interference in the surrounding area due to corona discharge.

[Brief description of the drawings]

FIG. 1 is a side view in which a part of a polymer insulator according to an example of the present invention is longitudinally cut.

FIG. 2 is a partial longitudinal sectional side view showing an enlarged upper end portion of the polymer insulator.

FIG. 3 is a vertical sectional side view showing a modification of the insulator head constituting the polymer insulator.

FIG. 4 is a schematic side view of a part of a molding die for molding the insulator head.

[Explanation of symbols]

10a: insulator main body, 10b, 10d: insulator head, 10
c: base fitting, 11: core, 11a: lower end, 11b
... upper end, 12 ... insulating coating, 12a ... trunk, 12b ...
Fins, 13a, 14a: cylindrical body, 13b, 14b: groove, 14c: fine particles, 14d: synthetic resin, 21: mounting bolt, 22: arm, 23: insulated wire, 23a: core wire, 23b: sheath , 24: binding wire, 25: mold, 25a, 25b: cavity, 25c, 25d: injection hole.

Claims (5)

[Claims] An insulator main body in which an outer periphery of a reinforced plastic core is covered with an elastic insulating cover, and an insulator head made of an insulating material constituting a head of the insulator main body. A tie-top insulator having a core made of reinforced plastic for binding an electric wire arranged in an annular groove provided on the outer periphery of the insulator head to the groove by a bind wire and fixing the electric wire to the outer periphery of the insulator head. A tie-top insulator having a core of reinforced plastic, wherein the insulator head is made of an insulating material having a higher hardness than the insulating cover of the insulator main portion. 2. An insulator main body having an outer periphery of a core of a reinforced plastic covered with an elastic insulating cover, and an insulator head made of an insulating material constituting a head of the insulator main body. A tie-top insulator having a core made of reinforced plastic for binding an electric wire arranged along an annular groove provided on the outer periphery of the insulator head to the groove by a bind wire and fixing the electric wire to the outer periphery of the insulator head. A tie-top insulator having a reinforced plastic core as a core, wherein an outer peripheral portion of the insulator head has a higher hardness than an insulating cover of the insulator main portion. 3. The tie-top insulator according to claim 1, wherein said insulator head is formed integrally with a top portion of said insulator main body. Tie top insulator. 4. The tie-top insulator according to claim 1, wherein the insulator head is formed separately from the insulator main body, and is fitted to the top of the insulator main body. A tie-top insulator with a reinforced plastic core that is characterized by being made. 5. The tie-top insulator according to claim 2, wherein the insulator head is formed by mixing a minute hard substance in an insulating material, and the hard substance is formed on an outer periphery of the insulator head. A tie-top insulator made of a reinforced plastic core, characterized in that the outer peripheral portion is scattered in a portion and the outer peripheral portion has a higher hardness than other portions.