JPH10172368A - Polymer insulator with water drip shade and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-drip-shade-equipped polymer insulator and a method for manufacturing the same, by which a polymer insulator can be provided with a water drip shade without requiring a large mold and the water- drip-shade-equipped polymer insulator is not broken through. SOLUTION: In a polymer insulator 11 comprising a core part 12, a shell part 13 provided on the outer peripheral surface of the core part 12, and a shade part 14 provided to project from the shell part 13, a water drip shade 1 provided with intermittent gaps 4 at its root 3 facing the shell part 13 is molded independently of a general shade part 14, and the water drip shade 1 molded is added to the shell part 13 of the polymer insulator 11 to manufacture a water-drip-shade-equipped polymer insulator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer porcelain tube having a drain cap and a method for producing the same. Here, the polymer insulator has a hollow core member made of fiber reinforced plastic and a jacket formed of an insulating polymer material on an outer peripheral surface of the hollow core member. Generally, the jacket is formed of a cylindrical sheath portion extending along the outer peripheral surface of the hollow core member, and a plurality of cap portions formed apart from each other in the axial direction. As the insulating polymer material, for example, silicone rubber, ethylene-propylene-diene copolymer (EPDM), or the like is used.

[0002]

2. Description of the Related Art Conventionally, porcelain insulators having drainers have been known. For example, Japan Electrical Manufacturers' Association Standard JE
The standard for porcelain porcelain pipes is established in M-1397. The purpose of the drainer is to improve the drainage of the surface of the insulator during cleaning of the insulator, prevent continuation of water drops, maintain a high withstand voltage during washing of the insulator, and prevent flashover accidents during washing. is there.

[0003] In other words, if there is no drain cap, a large amount of washing water flows continuously on the surface of the insulator pipe, and the insulator pipe is contaminated and has a low resistance value. There is a possibility that the insulator will be continuous from the top to the bottom of the insulator, and the insulation of the insulator will be lost, resulting in flashing. If a larger shade than a normal shade is placed at an appropriate distance, the dripping water will fall directly from the tip of the draining shade to the ground, and the continuity of the water drop will be lost. Trouble is gone.

[0004] By the way, as for the polymer porcelain, one with a drain cap has not yet been announced. The reason is,
One is the difficulty in manufacturing, so the concept is that a polymer insulator cannot be actually manufactured, even if the concept is similar to a porcelain insulator.

[0005]

Normally, a polymer insulator is not formed by shaping a clay cylinder like a porcelain insulator to form a shade, but a liquid rubber is used around a FRP core using a mold. And the rubber is heated and vulcanized and cured to form a cap portion and a body portion. When using a mold in this way, if a large diameter cap is provided in some places like a drainer, the other parts of the mold need to have the same diameter as the drainer for the structure. Therefore, there was a problem that the material cost of the mold was expensive. In addition, there is a problem that it is difficult to handle the entire mold because it is heavy, and it becomes more difficult to control the temperature required for vulcanization and curing of the rubber. Furthermore, when the mold is released after curing, a large one such as a drain hat increases the risk of being broken by the friction of the release. On the other hand, if the thickness is designed so as not to be broken, irregularities in the curing reaction speed caused by uneven thickness easily lead to problems such as generation of internal voids.

[0006] On the other hand, it is conceivable to provide the divided drain caps on the body of the polymer porcelain tube later with an adhesive, but the following problems arise when the drain cutters are bonded and provided. . That is, since the bonding portion is inferior in tracking erosion quality at the time of power application in a fouling environment than the rubber body, if the bonding portion is continuous between the inner periphery of the drainer and the trunk, Since it is a relatively weak point compared to other portions, the partial discharge concentrates there, and the bonding portion eventually causes electrical penetration breakdown. The penetrating fracture portion is carbonized and becomes electrically conductive, which adversely affects the electrical performance of the entire polymer insulator tube.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a polymer porcelain pipe with a drain cap that does not require a large mold and can be provided with a drain cap on the polymer porcelain pipe. is there.

[0008]

A polymer insulator tube with a drain cap according to the present invention comprises a core, a body provided on the outer peripheral surface of the core, and a cap provided protruding from the body. The polymer porcelain according to the present invention is characterized in that it has a drain cap provided with an intermittent gap at the base to the body.

The method for manufacturing a polymer insulator with a drain cap according to the present invention is a method for manufacturing a polymer insulator with a drain hat, wherein the drain cap is formed separately from a general cap.
The molded drainer is attached to the body of the polymer porcelain tube later.

[0010] In the present invention, by providing an intermittent gap at the root of the drainer cap to the body of the polymer insulator, the surface leakage current due to the voltage applied in a dirty environment smoothly passes through the gap, and No breakthrough occurs. Therefore, the electrical insulation of the polymer insulator is maintained, and the electric performance of the polymer insulator as a whole is not adversely affected. In addition, since the separately prepared drain cap is attached to the polymer insulator tube later, the mold does not need to be enlarged in accordance with the drain cap, and the drain cap does not break when the mold is released.
Further, since there is no problem even if the drainer is thinned, there is no fear of occurrence of defects due to disturbance of the effect reaction speed due to uneven wall thickness, and the amount of rubber used can be saved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing the structure of an example of a drain hat which is separately formed from a polymer insulator tube with a drain hat according to the present invention. FIG. 1 (a) is a plan view, and FIG. A perspective view,
FIG. 1C shows a front view. In the example shown in FIG. 1, the drainer 1 has a hole 2 in the center thereof, through which a body of a polymer insulator (not shown) is inserted. Hole 2
At the base 3 of the drainer 1 that is connected to the body of the polymer porcelain tube (not shown), there is provided a gap 4 composed of a plurality of arched concave portions in the circumferential direction when viewed from above. In addition, a part of the drainer 1 has a fitting portion 5 that can be fitted and connected so that continuity in the circumferential direction can be cut. In this example, the fitting portion 5 has a fitting shape formed by a combination of a concave portion and a convex portion. Then, with the fitting portion 5 opened,
A passage is formed through which the body of the polymer insulator (not shown) passes,
With the fitting portion 5 closed, the concave portion and the convex portion are engaged with each other, so that the fitting cannot be easily released.

FIG. 2 is a view showing an example of a method for producing a polymer insulator tube with a drain cap according to the present invention. FIG. 2 (a) is a partial sectional view, and FIG. 2 (b) is a partial perspective view. Show. FIG.
In the example shown in FIG. 1, the same members as those in the example shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the example shown in FIG. 2, first, a drainer 1 having the structure shown in FIG. 1 is prepared. The drainer shade 1 having the structure shown in FIG. 1 is manufactured by molding, vulcanizing and hardening a mold having a hole 2 at the center using a mold, and then releasing the gap 4 and the fitting of the base 3. The part 5 can be manufactured by processing. At the same time, a hollow FRP core 12, a silicone rubber body 13 provided on the outer peripheral surface of the FRP core 12, and a silicone rubber body Porcelain tube 11 composed of a cap 14
To manufacture.

Thereafter, with the fitting portion 5 of the prepared drainer 1 opened, the body 13 of the polymer porcelain tube 11 is placed in the hole 2 through the fitting portion 5. Then, as shown in FIG. 2, the drainer 1 is wound around a predetermined position of the body 13, and a portion corresponding to the leg of the arch-shaped gap 4 of the base 3 is bonded to the body 13 with a silicone resin-based adhesive. Material (RT
V) to obtain a polymer insulator tube with a drain cap of the present invention. Reference numeral 15 denotes a flange metal fitting provided at an end of the FRP core 12.

FIG. 3 is a view showing another example of the method for producing a polymer insulator tube with a drain cap according to the present invention. In the example shown in FIG. 3, the same members as those in the examples shown in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted. In the example shown in FIG.
An axial drop-preventing projection 21 is provided in a portion of the body portion 13 of the polymer insulator 11 immediately below the position where the drainer 1 is to be provided. And wrap it around the body 13 to arrange it. The projection 21 for preventing the shaft from falling in the axial direction is, for example, a general polymer insulator 11.
It can be easily formed by a method such as cutting off one of the cap portions 14 to the root. Note that, in this example, unlike the example shown in FIG.
Since the base 3 of the drainer 1 is engaged with the drainer 1, there is no need to bond the drainer 1 and the body 13 with an adhesive.

FIG. 4 is a view for explaining still another example of a polymer insulator tube with a drain cap and a method for manufacturing the same according to the present invention. In the example shown in FIG. 4, the same members as those in the examples shown in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted. In the example shown in FIG. 4, the thickness of the root portion 3 of the drainer 1 is configured to be thicker than the thickness of the other portions, and when the root 3 of the drainer 1 is engaged with the projection 21 and fixed thereto, the root portion is fixed. The upper part of 3 is engaged with the lower surface of the upper cap part 13. Therefore, as compared with the example shown in FIG. 3, the upward movement can be preferably prevented.

As shown in FIG. 2, in the case where the drainer 1 is fixed using an adhesive, a leakage current flows on the surface of the adhesive. Since the material of the adhesive is inferior to the tracking erosion resistance as compared with the silicone rubber used to form the drainer 1, a problem may occur if the adhesive is used in a highly polluted area without a sufficient leak distance. is there. That point,
As in the examples shown in FIGS. 3 and 4, no adhesive is used,
When fixing is performed only by fitting the fitting portion 5,
Don't worry. For this reason, it is preferable to select a method for fixing the drainer 1 according to the situation of the area to be used.

In the above-described embodiment, in the polymer insulator tube with the drain hat according to the present invention, if the root part 3 has a plurality of arch-shaped gaps 4, the original function of the drain hat is impaired due to water leakage. There is no problem with this concern. That is, according to the observation of the state of water dripping, FIG.
As shown in (2), most of the water flowing down onto the drainer 1 falls from the tip of the cap portion 14, and does not fall from an intermediate portion or flow along the body portion 13. Since there is no gap 4 of the drainer 1 just below the tip of the general hat 14 and the back of the upper surface of the drainer 1, the water dropped there flows to the upper surface of the drainer 1 to the tip. It does not go toward the gap 4 at the base 3 and fall from the gap 4.

[0018]

As is clear from the above description, according to the present invention, the following effects can be obtained. (1) Since the draining cap is retrofitted, it is not necessary to increase the diameter of the mold for forming the cap with the body having the general cap. (2) Since the drainer is molded alone, the shape is simple, so the mold can be released in either direction and is easy.
There is no worry that the drainer will break due to excessive friction. (3) Since there is no problem even if the drainage cap is thinly formed, there is no fear of occurrence of defects due to irregularities in the curing reaction speed caused by uneven thickness. The amount of rubber used can also be saved. (4) Since an arc-shaped gap is provided intermittently at the base of the draining cap, surface leakage current due to an applied voltage in a dirty environment smoothly passes through the gap, so that electrical penetration breakdown occurs. Absent.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an example of a drain hat which is separately formed from a polymer insulator tube with a drain hat of the present invention.

FIG. 2 is a view showing an example of a method for producing a polymer insulator tube with a drain cap according to the present invention.

FIG. 3 is a view showing another example of the method for producing a polymer insulator tube with a drain cap according to the present invention.

FIG. 4 is a view for explaining still another example of a polymer insulator tube with a drain cap and a method for manufacturing the same according to the present invention.

FIG. 5 is a view for explaining a state of water dripping in a polymer insulator tube with a drain cap according to the present invention.

[Explanation of symbols]

1 Drain cap, 2 holes, 3 roots, 4 gaps, 5
Fitting part, 11 polymer insulator, 12 FRP core, 13 trunk, 14 cap, 15 flange fitting, 2
1 Projection

Claims (6)

[Claims] 1. A polymer porcelain tube comprising a core portion, a body portion provided on the outer peripheral surface of the core portion, and a cap portion projecting from the body portion. A polymer insulator tube with a drain hat, characterized by having a drain hat with a large gap. 2. The polymer insulator tube with a drain hat according to claim 1, wherein said drain hat has a fitting portion which can be fitted and connected at which a portion of the hat in the circumferential direction is cut. 3. A method for manufacturing a polymer porcelain tube having a drain hat having the structure according to claim 1, wherein said drain hat is formed separately from a general cap part, and said formed drain hat is formed into a body of said polymer insulator. A method for producing a polymer porcelain tube with a drain cap, which is attached to a part. 4. A method of manufacturing a polymer porcelain tube having a drain hat having the structure according to claim 2, wherein the drain hat is formed separately from a general hat part, and a fitting portion of the formed drain hat is opened. By passing the body of the polymer porcelain tube through this fitting part in the fitted state, and then closing the fitting part,
A method for manufacturing a polymer porcelain tube with a drain hood, wherein the drain hood is attached to a body of the polymer porcelain tube. 5. The method for manufacturing a polymer insulator tube with a drain cap according to claim 3, wherein the base other than the gap of the drain cap is connected to the body of the polymer insulator with an adhesive. 6. The polymer with a drain gutter according to claim 3, wherein the base of the drain gutter other than the gap is connected by engaging a protrusion for retaining the drop provided on the body of the polymer insulator tube. The method of manufacturing porcelain tubes.