JPH11312421A - Frp tube for polymer sp insulator and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To design a thin-walled FRP tube of small diameter without causing cost increase. SOLUTION: A polymer SP(station post) insulator 1 comprises an FRP tube 2 and a covering 3 made of rubber and consisting of a trunk part 4 provided on the periphery of the FRP tube 2 and a plurality of sheds 5, and rib parts 12-1 to 12-4 projecting toward the center of the FRP tube 2 are provided on the inner circumference of the FRP tube 2. The FRP tube 2 is manufactured by forming grooves in a mandrel for forming the rib parts 12-1 to 12-4, filling portions of the grooves with fibers wound in these grooves, and forming a cylinder part 11 by a filament winding method with respect to the mandrel obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FRP cylinder,
The present invention relates to an FRP cylinder for a polymer SP insulator, comprising a body provided on the outer periphery of a P cylinder and a rubber jacket comprising a plurality of caps, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, as a polymer SP (station post) insulator constituting power devices such as a busbar support and a disconnector, a rubber comprising a FRP cylinder, a body provided on the outer periphery of the FRP cylinder, and a plurality of shades. And a polymer SP insulator composed of an outer jacket made of a polymer. FIGS. 5A and 5B are diagrams showing an example of the configuration of such a conventional polymer SP insulator. FIG. 5A is a side view showing a partial cross section of FIG.
FIG. 5B is a cross-sectional view taken along line AA of FIG. In the example shown in FIG. 5, the polymer SP insulator 51 includes an FRP cylinder 52 and a jacket 53 made of rubber. The outer cover 53 includes a body portion 54 provided on the entire outer peripheral surface of the FRP cylinder 52 and a plurality of caps 55 protruding from the body portion 54. And F
At both ends of the RP cylinder 52, flange fittings 56 are provided.

The FRP cylinder 52 used for the polymer SP insulator 51 described above is not shown on a mandrel 57 as shown in FIG. 6 after comprehensively evaluating cost, productivity, and electrical and mechanical performance. A glass roving 58 impregnated with a resin containing an epoxy resin and an amine or acid anhydride-based curing agent via a release agent is produced by a filament winding method in which a plurality of glass rovings are simultaneously wound in a clean room while suppressing generation of voids. Have been.

[0004]

In the actual use of the polymer SP insulator 51 having the above-described structure, a bending load F is applied in a direction perpendicular to the center axis of the polymer SP insulator 51 as shown in FIG. For this reason, in the polymer SP insulator 51, the bending fracture strength is an index of design. In addition to the bending fracture strength, the amount of deflection at the top when the bending load F is applied may be an index of design. Polymer SP insulator 51
About the amount of deflection of F
The material characteristics of the RP cylinder 52, that is, the deflection, are determined by the values of the Young's modulus of the material and the second moment of area. Since the Young's modulus of the FRP cylinder 52 is a fraction of that of porcelain, the same size (cross-sectional shape) is required. Deflection is several times larger than porcelain insulators. For this reason, in the polymer SP insulator 51,
An important issue has been how to reduce deflection without significantly increasing costs.

Here, it is conceivable to increase the thickness of the FRP cylinder 52 in order to reduce the deflection.
Due to the manufacturing restrictions of the above-mentioned filament winding method, there are also restrictions on increasing the wall thickness.
Therefore, in the polymer SP insulator 51, the FRP cylinder 5
How small and thin the 2 was designed was dominating the price. Increasing the diameter has also increased the cost of a mold for molding a jacket and the cost of connected parts.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an FRP cylinder for a polymer SP insulator and a method for manufacturing the same, which enable a small-diameter and thin-wall design without increasing the cost.

[0007]

An FRP cylinder for a polymer SP insulator according to the present invention comprises an FRP cylinder, and a rubber jacket comprising a body and a plurality of caps provided on the outer periphery of the FRP cylinder. A FRP cylinder for a polymer SP insulator, characterized in that a rib portion protruding toward the center of the FRP cylinder is provided on the inner periphery of the FRP cylinder.

Further, the FRP for the polymer SP insulator of the present invention
The method for manufacturing the cylinder is as follows.
In a method of manufacturing a tube, a groove for forming a rib portion on a mandrel is formed, and a fiber is wound in this groove to fill a groove portion, and then a cylindrical portion is formed on the obtained mandrel by a filament winding method. It is characterized by the following.

In the present invention, a rib portion protruding toward the center of the FRP cylinder is provided on the inner periphery of the FRP cylinder. In other words, the cross section of the FRP cylinder is formed by the cylindrical portion and the rib portion integrated with the inner diameter thereof. With this configuration, the second moment of area of the FRP cylinder can be increased, and the bending rigidity in the direction in which a bending load is applied can be effectively increased even with a small diameter. Therefore, if a polymer SP insulator is configured using this FRP cylinder, a polymer SP insulator having high bending load resistance and bending characteristics can be obtained at low cost. In addition, it is preferable that the rib portion is constituted by at least a pair of ribs provided at positions symmetrical with respect to the center axis of the FRP cylinder, because the above-mentioned operation can be more effectively achieved.

Further, the above-mentioned FR for a polymer SP insulator.
To manufacture the P-tube, a groove is formed on the mandrel to form a rib, and a fiber is wound in this groove to fill the groove, and then a cylindrical portion is formed on the obtained mandrel by a filament winding method. By doing so, it is possible to obtain an FRP cylinder having a pair of rib portions formed at low cost.

[0011]

FIG. 1 is a view showing the structure of an example of a polymer SP insulator using an FRP tube according to the present invention.
1A is a side view showing a partial cross-section, and FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A. In the example shown in FIG. 1, the polymer SP insulator 1
It is composed of an RP cylinder 2 and a jacket 3 made of rubber.
The outer cover 3 includes a body 4 provided on the entire outer peripheral surface of the FRP cylinder 2 and a plurality of caps 5 protruding from the body 4. Flange fittings 6 are provided at both ends of the FRP cylinder 2.

A feature of the present invention is that the FRP cylinder 2 is provided with a circumferential portion 11 and four ribs 12-1 to 12-4 provided on the inner circumference of the circumferential portion 11 at an angle of 90 degrees from each other. This is the point composed of In the present invention, the number of ribs is not limited to four, and it goes without saying that the number of ribs can be changed as needed. Each of the ribs 12-1 to 12-4 has the same shape with the same thickness and height over the entire length, is made of fibers wound in the axial direction, and is integrated with the cylindrical portion 11. Further, the entire cylindrical portion 11 is formed with a thickness that is allowed in manufacturing. Therefore, when comparing the conventional FRP cylinder configured only with the cylindrical portion and the FRP cylinder 2 of the present invention having the above-described configuration, if both have the same diameter,
The ribs of the present invention correspond to the ribs 12-1 to 12-4.
The second moment of area of the P cylinder 2 is the same as that of the conventional FRP cylinder.
It becomes larger than the next moment, and the bending rigidity with respect to the bending load F in FIG. 1 can be increased.

Here, since the polymer SP insulator is used up to an ultrahigh-voltage line, it is necessary to use a high-quality FRP cylinder which has sufficient adhesion between glass fiber and resin and is free from voids. In addition, a large bending load among the bending loads acts as a bending load F in a direction perpendicular to the line, and a suitably small load is applied also in the line direction. In consideration of this directionality, in actual use, four ribs 12-1 to 12-4 are respectively arranged in the line direction (for example, a pair of ribs 12-1 and 12-
3) and a direction perpendicular to the line direction (for example, a pair of ribs 12).
-2 and 12-4), the ribs 12-1 to 12-4 can be used more effectively, resulting in an optimal design.

FIGS. 2 to 4 are views showing a method of manufacturing the FRP cylinder for a polymer SP insulator according to the present invention in the order of steps. Hereinafter, a method of manufacturing the FRP cylinder for a polymer SP insulator according to the present invention will be described with reference to FIGS. First, as shown in FIGS. 2 (a) and 2 (b), a side view and a cross-sectional view along the line AA thereof show that grooves 21-1 are formed at portions where a rib portion is to be formed, here 90 ° apart from each other. A mandrel 22 having 21-4 is provided. Next, FIGS. 3A and 3B show a side view and A
As shown in a cross-sectional view along the line A, a glass roving 23 which is a glass fiber impregnated with a resin by a filament winding method is inserted into a pair of grooves (grooves 21-1 and 21-).
3 and a pair of grooves 21-2 and 21-4) in the axial direction over the entire length, and the grooves 21-1 to 21-4 are filled with a glass roving 23.

Next, as shown in FIGS. 4 (a) and 4 (b), a side view and a cross-sectional view taken along the line AA are shown.
Mandrel 22 with 1-4 filled with glass roving 23
On the other hand, the glass roving 23 is wound in the axial direction of the FRP cylinder 2 or at an angle close thereto by a filament winding method to form a cylindrical portion. Thereafter, the resin is cured, and the mandrel 22 is removed, for example, by removing the FRP layer present at both ends of the mandrel 22 and then withdrawn.
Can be obtained. The above-mentioned operation can be easily carried out with currently available machinery.

Then, after processing both ends of the obtained FRP cylinder 2, the flange fitting 6 is hermetically and mechanically mounted. The inside of the FRP cylinder 2 is filled with SF ₆ gas or filled with a solid or independent foamed sponge-like insulator such as silicone rubber to enhance the internal insulation.
Thereafter, an outer jacket 3 made of silicone rubber or the like is formed around the outer periphery of the FRP cylinder 2 having the flange fittings 6 at both ends by using, for example, a mold, and is vulcanized and cured to obtain the FRP of the present invention.
The polymer SP insulator 1 using the cylinder 2 can be obtained. The inner peripheral surface of the FRP cylinder 2 is preferably coated with water-repellent silicone rubber, resin, or the like. This is to prevent a continuous conductive film from being formed when moisture permeating into the inside is dewed, and to minimize a decrease in insulation strength.

[0017]

As is apparent from the above description, according to the present invention, the rib portion protruding toward the center of the FRP cylinder is provided on the inner periphery of the FRP cylinder.
Since the cross section of the RP cylinder is composed of the cylindrical portion and the rib portion integrated with the inner diameter, the secondary moment of area of the FRP cylinder can be increased, and even in the case of a small diameter, the bending rigidity in the direction in which a bending load is applied is effectively increased. Can be increased. Therefore, this F
If the polymer SP insulator is configured using the RP cylinder, a polymer SP insulator having high bending load resistance can be obtained at low cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an example of a polymer SP insulator using an FRP cylinder of the present invention.

FIG. 2 is a view showing one step of a method of manufacturing an FRP cylinder for a polymer SP insulator according to the present invention.

FIG. 3 is a view showing another step of the method for producing the FRP cylinder for a polymer SP insulator of the present invention.

FIG. 4 is a view showing the steps of still another example of the method of manufacturing the FRP cylinder for a polymer SP insulator according to the present invention.

FIG. 5 is a diagram showing a configuration of an example of a conventional polymer SP insulator.

FIG. 6 is a view showing one step of a conventional method of manufacturing an FRP cylinder for a polymer SP insulator.

[Explanation of symbols]

1 Polymer SP insulator, 2 FRP cylinder, 3 jacket, 4
Body, 5 shades, 6 flanges, 11 cylindrical part, 1
2-1 to 12-4 ribs, 21-1 to 21-4 grooves, 22
Mandrel, 23 glass roving

Claims (3)

[Claims] 1. An FRP cylinder for a polymer SP insulator, comprising an FRP cylinder, and a rubber jacket comprising a body provided on the outer periphery of the FRP cylinder and a plurality of caps, wherein an inner periphery of the FRP cylinder is provided. A rib portion protruding toward the center of the FRP cylinder, the FRP cylinder for a polymer SP insulator. 2. The FRP cylinder for a polymer SP insulator according to claim 1, wherein said rib portion comprises at least a pair of ribs provided at positions symmetrical with respect to a center axis of the FRP cylinder. 3. A method for manufacturing an FRP cylinder for a polymer SP insulator according to claim 1, wherein a groove for forming a rib portion is formed on the mandrel, and a fiber is wound in the groove to fill the groove. Thereafter, a cylindrical portion is formed on the obtained mandrel by a filament winding method, thereby producing a FRP cylinder for a polymer SP insulator.