JP3408211B2 - Manufacturing method of composite organic insulator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite organic insulator which is used in an overhead power transmission line, a distribution line, a substation, a railway line, or the like and has an insulating core made of an organic polymer material on an insulating core. It relates to a manufacturing method. The composite organic insulator in the present invention includes an insulator tube, and is made of an insulating core body such as FRP having excellent mechanical properties, and ethylene propylene rubber, silicone rubber having excellent weather resistance and insulating properties. Refers to a combination with an insulating skin. The liquid organic polymer material also includes a highly viscous organic polymer material that is an injection molding material.

[0002]

2. Description of the Related Art Conventionally, porcelain insulators have been used for wiring of overhead power transmission lines, etc., but in recent years, an organic polymer material is formed on the outer periphery of an insulating core body such as glass fiber reinforced plastic (FRP). Composite organic insulators coated with an insulating skin have come into use. In order to extend the creepage insulation distance, the insulative outer cover usually has a shape in which a plurality of shades are continuously provided. This composite organic insulator has the advantages of being lighter in weight, superior in impact resistance, and less likely to be polluted than conventional porcelain insulators.

Such a composite organic insulator is manufactured by an injection molding method, a transfer molding method or the like in which an insulating core is placed in a cavity of a mold, and a liquid organic polymer material is filled in the cavity and solidified. ing. by the way,
When manufacturing a long composite organic insulator, it is expensive to mold with a single mold because the mold is large and the manufacturing equipment is also large. Therefore, for liquid organic polymer materials, use a small mold. The insulating core is sequentially filled in several times along the length direction and solidified.

That is, as shown in FIG. 3A, the insulating core 4 is placed in the cavity 14 of the small mold B in which the three cap molds 1 and the one connecting mold 12 are stacked in this order. One end side is placed, and the cavity 14 is filled with liquid silicone and solidified to form the insulating outer cover 16 (see FIG. 4). Next, as shown in FIG. 3B, a small mold C in which one connecting mold 7, three capping molds 1 and one terminating mold 8 are stacked in this order.
The other end side of the insulative core body is placed in the cavity 13, and liquid silicone is filled in the cavity 13 and solidified, and the other end side of the insulative core body 4 is covered with the insulative outer cover 17 (FIG. 4).
). Here, the three shade molds 1 are shared by the small molds B and C. In FIG. 3A and FIG. 3B, 9 is a terminal metal fitting. In all the drawings of the present specification, those having the same function are designated by the same reference numeral, and the repeated description thereof will be omitted.

[0005]

However, in the above-mentioned manufacturing method, the connecting mold 7 is arranged so as to cover the portion formed by the connecting mold 12, but if a minute gap is generated between them, As shown in FIG. 4, when the insulating outer skin 17 is formed, the liquid organic polymer material is used to form the insulating outer skin 1 previously formed.
There is a problem that burr 11 is generated by leaking to the connecting portion 10 of 6. Not only does this burr 11 look unattractive, but during use, fouling substances accumulate on the burr 11 to generate a leakage current, which also causes flashover and corona discharge. To remove this burr 11, it is necessary to carry out a troublesome work of scraping it off and finishing the mark smoothly.
Productivity is hindered. For this reason, an O-ring (not shown) is fitted on the inner surface of the connecting mold 7 shown in FIG. 3B to prevent liquid leakage. There is a problem that the leak prevention effect cannot be obtained, and it takes time to manage and replace the O-ring against deterioration. An object of the present invention is to provide a method for manufacturing a composite organic insulator which can easily prevent burrs from being generated.

[0006]

The invention according to claim 1 is
A liquid organic polymer material is solidified on the outer periphery of the insulative core in a plurality of times in the longitudinal direction of the insulative core by using a small mold, and is solidified so that the outer periphery of the insulative core is insulated. In a method for manufacturing a composite organic insulator for forming an outer skin, a liquid leakage prevention convex portion is provided at a rear end portion of the previous insulating outer skin, and a liquid organic polymer material liquid for forming the next insulating outer skin. A method for producing a composite organic insulator, which is characterized by preventing leakage.

The invention according to claim 2 is the method for producing a composite organic insulator according to claim 1, wherein the liquid leakage prevention convex portion has an arcuate cross section having a thickness of 1.5 mm or more.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to the drawings. 1A and 1B are process explanatory views showing an embodiment of the present invention. First, as shown in FIG.
One end side of the insulating core body 4 is arranged in the cavity 3 of the small mold A in which one capping mold 1 and one connecting mold 2 are stacked in this order, and the liquid silicone is filled in the cavity 3. After being filled and solidified, the insulating outer core 1 is attached to the outer periphery of one end of the insulating core body 4.
5 (see FIG. 1B). Here, the connecting mold 2 is formed with a concave portion 5 for providing a liquid leakage preventing convex portion.

Next, as shown in FIG. 1B, a cavity of a small mold C in which one connecting mold 7, three capping molds 1 and one terminal mold 8 are stacked in this order. Insulating core 4 in 13
The other end side is placed, and liquid silicone is filled in the cavity 13 and solidified to form an insulating outer cover. At this time, the liquid leakage prevention convex portion 6 formed on the previous insulating outer skin 15
Is pressed in the small mold A to be flattened to serve as an O-ring and prevent liquid leakage when forming the next insulating outer cover. Since this liquid leakage prevention convex portion 6 is used only once for the purpose of preventing liquid leakage, it does not deteriorate and liquid leakage is satisfactorily prevented. Moreover, unlike the O-ring, it does not require the trouble of management and replacement. In the present invention, when manufacturing a longer composite organic insulator, the insulating outer skin 15 is repeatedly formed using the small mold A, and finally the insulating outer skin on the terminal side is formed using the small mold C. To do.

FIG. 2A is a side view of the composite organic insulator manufactured according to the present invention. An insulative outer skin 15 and a next insulative outer skin 17 are sequentially formed on the outer periphery of the insulative core 4 in the longitudinal direction. The connecting portion 10 of the insulating outer cover 15 is provided with the liquid leakage prevention convex portion 6 having an arc-shaped cross section. Figure 2 (b)
FIG. 4 is an enlarged view of a liquid leakage prevention convex portion 6 portion of the composite organic insulator. The liquid leakage prevention protrusion 6 has an arcuate cross section, T indicates the thickness of the liquid leakage prevention protrusion 6, and L indicates the length. No burr is generated in the upper portion of the liquid leakage prevention convex portion 6.

In the present invention, the shape of the liquid leakage prevention convex portion 6 is not particularly limited, but it is desirable that the liquid leakage preventing convex portion 6 does not have a corner because corona discharge or the like does not easily occur. In particular, an arc-shaped cross section looks good. It is desirable that the thickness T is 1.5 mm or more so that liquid leakage can be surely prevented.

[0012]

EXAMPLES The present invention will be described in detail below with reference to examples. (Example 1) A composite organic insulator was manufactured by forming an insulating outer cover in two steps using the small molds A and B shown in FIG. The shape of the liquid leakage prevention convex portion 6 has an arcuate cross section, and its thickness T and length L (T and L are shown in FIG. 2B) are variously changed. Each of the 10 composite organic insulators was manufactured.

(Comparative Example 1) A composite organic insulator was manufactured by the same method as in Example 1 except that the liquid leakage preventing convex portion was not provided.

Comparative Example 2 Ten composite organic insulators were manufactured by a conventional method using an O-ring. The O-ring was not replaced.

The burrs were examined for each of the composite organic insulators produced in Example 1 and Comparative Examples 1 and 2. The results are shown in Table 1.

[0016]

[Table 1] (Note) ◎: No burr is generated. ◯: A small burr that has no problem in practical use is generated. X: Large burr is generated. B: Burrs occurred after the 8th time.

As is clear from Table 1, all of Nos. 1 to 5 of the present invention were burrs that did not occur at all, or even if burrs did occur, there was no problem in practical use. On the contrary,
No. 6 of the comparative example did not have the liquid leakage preventing convex portion, so liquid leakage occurred and burr occurred, and number 7 of the comparative example deteriorated the O-ring and burr occurred after the eighth time.

An overhead power transmission line was wired by using each of the composite organic insulators manufactured in Example 1, but the insulating outer cover was less contaminated, and leakage current, flashover, corona discharge, etc. did not occur and good power transmission was achieved. Was stable.

[0019]

As described above, according to the present invention, since the convex portion for preventing liquid leakage of the liquid organic polymer material is provided at the rear end portion of the insulating outer cover that is solidified and formed first, the following insulation The liquid leakage preventing convex portion functions as an O-ring at the time of forming the exogenous skin, and liquid leakage of the liquid organic polymer material is suppressed to prevent burrs from being generated. Since the liquid leakage prevention convex portion is used only once for liquid leakage prevention, it does not deteriorate and liquid leakage is well prevented. In addition, the O-ring does not require the troublesome management and replacement. When the liquid leakage prevention convex portion has an arcuate cross section, it has a good appearance and is less likely to cause corona discharge. Further, by setting the thickness to 1.5 mm or more, liquid leakage can be suppressed more reliably. Therefore, it has a remarkable industrial effect.

[Brief description of drawings]

1A and 1B are process explanatory views showing an embodiment of a manufacturing method of the present invention.

FIG. 2A is a side view showing an embodiment of a composite organic insulator manufactured according to the present invention, and FIG. 2B is an enlarged view of a liquid leakage prevention convex portion of the composite organic insulator.

FIG. 3 is a process explanatory diagram of a conventional manufacturing method.

FIG. 4 is a side view of a conventional composite organic insulator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Capsule mold 2 Connecting mold 3 used in the present invention 3 Cavity of small mold A used in the present invention 4 Insulating core 5 Recessed portion 6 for forming a liquid leakage prevention convex portion 6 Liquid leakage prevention convex portion 7 Connecting metal Mold 8 Terminal mold 9 Terminal fitting 10 Insulating outer cover connecting portion 11 Burr 12 Conventional connecting mold 13 Cavity of small mold C 14 Cavity of conventional small mold B 15 Composite organic insulator manufactured by the present invention Insulating Skin 16 Formed Previously Insulating Skin 17 Formed Previously of Conventional Composite Organic Insulator 17 Insulating Skin Formed Next

Claims (2)

(57) [Claims] 1. An insulating core body is obtained by sequentially solidifying a liquid organic polymer material on the outer periphery of the insulating core body in a plurality of times in the length direction of the insulating core body using a small mold. In a method for manufacturing a composite organic insulator, which forms an insulating skin on the outer periphery of,
A composite organic insulator characterized in that a liquid leakage preventing convex portion is provided on the rear end portion of the previous insulating outer skin to prevent liquid leakage of the liquid organic polymer material when forming the next insulating outer skin. Manufacturing method. 2. The method for producing a composite organic insulator according to claim 1, wherein the liquid leakage prevention convex portion has an arcuate cross section with a thickness of 1.5 mm or more.