JPS6028216B2 - insulation spacer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulating spacer for supporting and insulating a conductor disposed in a conduit such as an aerial power transmission line or a gas insulated switchgear filled with an insulating gas, and particularly relates to This invention relates to an improved insulating spacer in which the adhesive interface between a metal member embedded in the flange portion of the insulating spacer and a thermosetting resin is improved to improve pressure resistance.

The insulating spacer insulates and supports the conductors installed in the pipe machine, and at the same time protects against electromagnetic force when a short-circuit current flows through the conductor, and as a partition wall for gas divisions when the pipe line is divided into gas sections of a certain length. Must be able to withstand pressure intensity.

Therefore, it is no exaggeration to say that the flange portion of the insulation spacer is determined mostly by its pressure resistance. The prior art will be explained below with reference to FIG.

FIG. 1 shows an insulating spacer in which a cylindrical embedded bushing having a female thread is disposed on the flange. The insulating spacer 1 is made of a thermosetting molding resin and is made of a Western-style molded resin, integrally including a shield electrode 2 in the filling part and an embedded pusher 4 having a female thread 5 disposed in the flange part 3. In reality, the design of the insulating spacer constructed in this manner has been improved by increasing the thickness of the flange portion 3 in order to improve pressure resistance. However, the flange part 3
If the pressure resistance strength was improved only by increasing the wall thickness, this would result in an increase in structural weight, various inconveniences in assembly work, and would not be economical.

The pressure resistance strength of the insulating spacer 1 shown in FIG. 1 will be explained with reference to FIG. 2. When one side of the insulating spacer 1 is pressurized, a bending moment M acts on the flange portion 3 in the direction shown in the figure. The embedded bushing 4 embedded in the flange portion 3 is attached to the flange 6 of the conduit via a fully threaded stud 7 with a nut 8. Therefore, the acting force due to the bending moment near the embedded push 4 is
Concentrates on ends A and B. That is, a compressive force acts on the end A of the embedded bush 4, and a tensile force acts on the end B.

Therefore, since the above load mainly acts on the adhesive interface between the embedded bush 4 and the thermosetting resin, the rate of stress concentration increases. If an abnormality such as a hair crack occurs in the surrounding area, and further pressure is applied, the hair crack may become a starting point and destroy the substrate. Therefore, the present invention has been made to eliminate the above-mentioned drawbacks.By improving the structure of the adhesive interface of the embedded push part, the hair crack generation pressure near the embedded bush is increased, and the fracture pressure is increased. An object of the present invention is to provide an insulating spacer 1 that can improve the reliability of the spacer.

Embodiments of the present invention will be described in detail with reference to FIGS. 3 to 5.

In FIG. 3, from the end of the bush 32 embedded in the base plate 31 made of thermosetting resin,
A cushioning material 33 made of rubber or soft synthetic wood is provided on the outer diameter part of the bush for a length of about 1'4 of the push outer flange D. As a result, the acting force concentrated on the bush end due to the bending moment during pressurization is alleviated by the elastic deformation of the buffer material 33, and the acting force is equally distributed over the entire length of the push, thereby increasing the pressure at which shear cracks occur. becomes possible. In addition, in FIG. 4, in order to change the Young's modulus of the resin that reaches the adhesive interface between the bush 32 and the smoother 31 formed of thermosetting resin, in addition to the cushioning materials 33 at both ends, a synthetic fiber is used in the center of the bush. By winding the non-woven fabric 34 and filtering the filler contained in the thermosetting casting resin through the non-woven fabric 34, the area near the push 32 is purified to only the thermosetting resin, thereby increasing the Young's modulus to 1000 k9/fence 2 to 3.
00k9/side can be reduced by about 2.

Therefore, when a bending moment acts on the flange portion of the smoother 31, the bending load sharing over the entire length of the bushing 32 is improved compared to the case shown in FIG. 3 because the bushing 32 is bonded with a material having a lower Young's modulus in the vicinity of the pusher. Fig. 5 is for reducing the number of man-hours required for attaching a cushioning material to the bush during the casting process shown in Fig. 4.A nonwoven fabric 34 is wound over the entire length of the bush 32, and the function and operation are the same as in Fig. 4. It is.

As explained above, according to the present invention, when a metal member is buried in the flange portion of an insulating swather, the edge of the metal member is Since the cushioning material is provided at the flange part of the insulation smoother 1, when a bending moment acts on the flange part of the insulation smoother 1, the bending load is shared by the entire length of the metal member, which prevents the occurrence of cracks and even destruction of the insulation smoother 1. It is possible to provide an insulating spacer 1 that can prevent the above problems and has high reliability.

[Brief explanation of the drawing]

Fig. 1a is a cross-sectional view showing an example of a conventional device, Fig. 1b is a cross-sectional view taken along line A-A in Fig. 1a, Fig. 2 is an enlarged view explaining the operation of Fig. 1, and Fig. 3 1 is a cross-sectional view showing one embodiment of the present invention, and FIGS. 4 and 5 are cross-sectional views showing different embodiments of the present invention. 31...Insulation spacer, 32...Bush, 33...
Cushioning material, 34... nonwoven fabric. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. In an insulating spacer made of thermosetting casting resin, the pipe is filled with an insulating gas, has at least one center conductor penetrating the middle part, and is made of a thermosetting resin, the flange of the pipe is A cushioning material is embedded through a metal member having a female thread for fastening to the part, and a cushioning material is provided at the interface between the metal member and the thermosetting molded resin constituting the insulating spacer and at the end of the metal member. An insulating spacer characterized by being provided with an insulating spacer. 2. A synthetic fiber-based nonwoven fabric is wound around the middle part of the interface, and the filler filled in the thermosetting resin is filtered through the nonwoven fabric, so that only the thermosetting resin component is present at the adhesive interface with the metal member. An insulating spacer according to claim 1, constructed as follows. 3. The insulating spacer according to claim 1, wherein a cushioning material is wound on a nonwoven fabric wound over the entire length of a metal member.