JPS6233638A - Porcelain insulator with light-transmitting body - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention is used for electric lines, and includes a transparent body for connecting to optical sensors that measure line voltage, line current, etc. Regarding porcelain insulators.

(Prior Art) In recent years, with the diversification of power demand, it has become necessary to accurately and quickly respond to power supply. For this reason, power system supply and management facilities are becoming more complex and diversified, and automation system development and practical application are being promoted. Further, the collection of information related to power supply, for example, the detection and measurement of line voltage and current, etc., must be performed accurately and quickly, over a wide range, and at many locations. Therefore, the use of optical technology suitable for transmitting large amounts of information is attracting attention.

By the way, as a support insulator for electrical equipment using optical applied technology, for example, an insulator incorporating an optical fiber for communication disclosed in Japanese Utility Model Application Publication No. 57-143619 has been proposed.

As shown in FIG.
An optical fiber 24 having an optical fiber connector 22 and 23 attached thereto is provided to penetrate through the optical fiber 1a. moreover,
The hole 21a is sealed using an O-ring 25 and a filler 26 for waterproofing and dustproofing.

(Problems to be Solved by the Invention) However, the above-mentioned insulator may be damaged at sealed locations such as the O-ring 25 and the filler 26 due to external force, temperature change, or aging. Furthermore, it has been difficult to maintain the sealed area stably for a long period of time. For this reason, moisture absorption, water intrusion, etc. induce a reduction in the insulation inside the hole 21a and deterioration of the optical fiber 24, which is likely to cause failure of the optical sensor using the optical fiber 24. Furthermore, the work of assembling the optical fiber 24 into the hole 21a is troublesome, and product quality control and mass production are not easy.

In view of the above-mentioned circumstances, this invention eliminates the factors of damage caused by external conditions or aging, and stably maintains the function of a transparent body such as an optical fiber without impairing its insulation properties. The purpose is to provide a porcelain insulator equipped with a translucent body.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a transparent material for the insulator body by arranging it in the axial direction of the raw material of the insulator body 1 and firing it at the same time. A structure is adopted in which the transparent body 2 is integrally formed with the light transmitting body 1.

(Operation) This invention operates as follows by employing the above means.

The porcelain insulator transmits light through a transparent body passing through it in the axial direction. Therefore, by connecting an optical sensor to the light-transmitting body, a porcelain insulator with an optical sensor is appropriately constructed. Furthermore, since the transparent body and the insulator body are integrally formed, moisture and dust are prevented from entering the inside of the insulator. Therefore, the original insulation properties and mechanical strength of the porcelain insulator are maintained.

(Example) Hereinafter, an example embodying the present invention will be described in detail based on FIGS. 1 to 3.

A first embodiment is shown in FIG. An insulator body 1 made of fired porcelain molded into two predetermined shapes and dimensions has a transparent body 2 made of an optical fiber or a highly translucent alumina rod sealed and buried in the axial direction of the central part of the insulator body 1. It is molded integrally with the main body 1. The insulator body 1 is made by extruding a porcelain raw material kneaded and foamed using a vacuum kneading machine into a rod shape, and then appropriately cutting the raw material into a predetermined shape. Next, dry
It was manufactured by applying porcelain glaze and firing.

By the way, in this embodiment, in the extrusion process, the transparent body material for forming the transparent body 2 is fed out from a through hole opened at the front end of the propeller shaft of the vacuum kneading machine. Simultaneously with the extrusion of the porcelain green material, the transparent material is continuously extruded and embedded in the porcelain green material.

As described above, the formation, drying, glazing and firing are carried out in accordance with the conventional manufacturing of porcelain insulators.

Next, the operation of the porcelain insulator provided with the transparent body of the first embodiment will be explained.

Since the insulator body 1 and the transparent body 2 are baked and solidified as one body, the insulator body 1 is prevented from deteriorating and has stable mechanical strength without losing its insulation properties.

Furthermore, as the insulator body 1 is an insulator having an optical transmission function, optical application technology can be appropriately and easily applied thereto.

Note that the light-transmitting material in the extrusion process can also be extracted through a porcelain glaze tank.

In this case, the translucent material can be embedded in the porcelain green body by coating the surface with a glaze. Therefore, the glaze becomes molten due to the heat during firing, and the transparent body 2 and the insulator body 1 are more firmly fixed to each other. In addition, by appropriately selecting and adjusting the coefficient of thermal expansion of the glaze, thermal stress at the interface between the transparent body 2 and the insulator body 1 can be alleviated and eliminated, and the sealing performance and mechanical strength can be stabilized. can.

In this embodiment, the transparent body 2 and the insulator body 1 are integrated by firing shrinkage of the insulator body 1 by firing and by semi-fusion welding. In addition to the above-mentioned extrusion molding method, the transparent body 2 can also be embedded in the insulator body 1 by a cast molding method or the like.

Next, a second embodiment is shown in FIG. The insulator body 1 is made of porcelain that has been molded into a predetermined shape and has one dimension, and is made of fired porcelain.
A transparent body 2 is fired integrally with the insulator body 1 in the axial direction of the central portion thereof. In this embodiment, as in the first embodiment, a porcelain green material is mixed and defoamed using a vacuum kneading machine, and extruded into a rod shape to form an insulator body 1. In this extrusion step, the transparent body material for forming the transparent body 2 is extruded from the through hole at the front end of the propeller shaft of the vacuum kneading machine, and at the same time as the green material for porcelain is extruded, the same material is extruded. It is continuously press-fitted into the base material. The transparent material includes quartz,
Powders or pieces of various glass raw materials such as alumina are kneaded into a semi-solid state.

Hereinafter, drying, glazing, and firing are performed according to conventional methods for manufacturing porcelain insulators. ``This second embodiment operates in the same manner as the first embodiment described above, so a description thereof will be omitted.

Note that the light-transmitting material for forming the light-transmitting body 2 may be obtained by extruding the raw material into a cylindrical shape and press-fitting the material in powder or fluid form into the guide holes 3 previously provided in the insulator body 1. You can also do it.

In this case, the firing temperature of the insulator body 1, that is, 12
The transparent body material is melted by the high temperature of about 50 to 1300°C, and the transparent body 2 is formed. Moreover, if the transparent body 2 is integrated in the axial direction of the central part of the insulator body 1, the insulator body 1
The mechanical strength of the material is maintained, and the internal insulation is also stabilized.

As shown in FIG. 2, in the insulator body 1 as described above, optical sensor parts such as an electro-optical element 4 and an optical connector 5 are connected to both upper and lower ends of the transparent body 2, respectively. Then, by fixing the energizing side metal fitting 7 that holds the electric wire 6 with cement 8 to the upper part of the insulator body 1, and fixing the grounding side metal fitting 9 with cement 10 to the lower part, the optical application technology can be realized. It is possible to easily construct an insulator device having a photosensor function using this method.

Effects of the Invention As detailed above, this invention prevents the deterioration of the insulator due to external conditions and aging, and maintains the mechanical strength of the insulator.
Since the insulation properties of the insulator can be improved, the function of the transparent body as an optical transmission path can be stably maintained without impairing the inherent insulation properties of the insulator.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment embodying the present invention, FIG. 2 is a dark blue sectional view showing the embodiment of FIG. 1 applied to a detector using an electro-optical element, and FIG. FIG. 4 is a longitudinal sectional view showing the second embodiment, and FIG. 4 is a longitudinal sectional view showing the conventional example. 1... Insulator body, 2... Translucent body, 3... Guide hole. Figure 3

Claims (1)

[Scope of Claims] 1. The transparent material (2) is integrally formed with the insulator body (1) by arranging the transparent material in the axial direction of the raw material of the insulator body (1) and firing at the same time. A porcelain insulator with a translucent body. 2. The light-transmitting body (2) is a light-transmitting body material inserted into a guide hole (3) provided in the insulator body (1).
A porcelain insulator equipped with a translucent body as described in 2. 3. A porcelain insulator comprising a transparent body according to claim 1, wherein the transparent body (2) is formed by extruding a transparent body material together with the insulator body (1). 4. The scope of claims that the light-transmitting body material is unfired, and the light-transmitting body (2) has the light-transmitting body material filled in the guiding holes (3) provided in the insulator body (1). A porcelain insulator comprising the transparent body according to item 1. 5. A porcelain insulator equipped with a light transmitting body according to claim 2 or 3, wherein the light transmitting body material is made of a pre-fired material such as an optical fiber, an alumina rod, or a quartz rod. 6. A porcelain insulator equipped with a transparent body according to claim 2 or 3, wherein the transparent body material is an unfired material such as various glass raw materials.