JP2010142089A - Device for connecting electric instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve insulation characteristics so that the surface pressure becomes equal in all areas of a flexible insulator at an interface connection. <P>SOLUTION: The connection device includes a molded first electric instrument 1a having a first interface connection 5 dented like a cone, a step part 7 with a predetermined depth provided in the first interface connection 5, a flexible insulator 13 arranged on the step part 7, and a molded second electric instrument 1b having a second interface connection 11 projected like a cone and connected with the first interface connection 5 via the flexible insulator 13. When the flexible insulator 13 is compressed, the same surface pressure is applied to all the areas of the interface connections 5 and 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a connection device for electrical equipment that connects electrical equipment such as a vacuum valve molded with a solid insulator.

2. Description of the Related Art Conventionally, a solid insulation type switchgear in which an electric device such as a vacuum valve is molded with a solid insulator such as an epoxy resin to constitute a power supply system is known. In the connection between the molded electrical devices, an annular flexible insulator such as silicon rubber is provided between the interface connection portions having an insulating layer surface formed in a conical shape in which one protrudes and a conical shape in which the other is depressed. Insert and interface connection is made. The flexible insulator is applied with a surface pressure so as to be in close contact with the surface of the insulating layer, thereby improving the insulation characteristics (see, for example, Patent Document 1).
JP 2005-27406 A (page 4, FIG. 1)

  The above-described conventional electrical device connecting apparatus has the following problems. The flexible insulator receives compression pressure from the surfaces of the insulating layers and comes into close contact with the surface of the insulating layer due to the repulsive force, but is subjected to stress that shrinks in the inner diameter direction and stress that extends in the outer diameter direction. For this reason, the surface pressure may become non-uniform throughout the thickness direction, the inner diameter direction, and the outer diameter direction of the flexible insulator. If the surface pressure becomes non-uniform, partial discharge occurs at a portion where the surface pressure is low, and the insulating characteristics are deteriorated.

  The present invention has been made in order to solve the above-described problem, and when connecting a molded electric device, the connection device for the electric device can improve the insulation characteristics by making the surface pressure uniform over the entire interface connecting portion. The purpose is to provide.

  In order to achieve the above object, a connection device for an electric device according to the present invention includes a first electric device having a first interface connection portion that is recessed in a conical shape, and a predetermined provided in the first interface connection portion. A step portion having a depth of, a flexible insulator disposed in the step portion, and a second protruding in a conical shape connected to the first interface connection portion via the flexible insulator. And a second electric device having the interface connecting portion, and when the flexible insulator is compressed, the surface pressure is the same throughout the interface connecting portion.

  According to the present invention, a predetermined surface pressure is applied to the side surface portion of the stepped portion by using the outer diameter of the flexible insulator disposed in the stepped portion rather than the inner diameter of the stepped portion provided in one interface connecting portion. Thus, the surface pressure obtained by compressing the flexible insulator is uniform over the entire interface connection portion, and the insulating characteristics can be kept good.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, an electrical apparatus connecting apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing the configuration of an electrical device connection apparatus according to Embodiment 1 of the present invention, and FIG. 2 is an exploded view of the configuration of the electrical equipment connection device according to Embodiment 1 of the present invention. is there.

  As shown in FIG. 1, the connection device for an electric device includes a first electric device 1a and a second electric device 1b connected to the first electric device 1a.

  The first electric device 1 a is provided with a first insulating layer 3 formed by molding an epoxy resin around the first central conductor 2. The end of the first central conductor 2 is a connection portion 4 having a concave central portion and an exposed inner peripheral surface. The end of the first insulating layer 3 is a first interface connection portion 5 whose central portion is recessed in a conical shape, and an outer peripheral portion is a first flange portion 6 protruding in the radial direction. The first interface connecting portion 5 is provided with a conical stepped portion 7 having a predetermined depth t.

  The second electrical device 1b is provided with a second insulating layer 9 formed by molding an epoxy resin around the second central conductor 8. The end of the second central conductor 8 protrudes, and a contact 10 that contacts the connecting portion 4 is provided at the tip. The end of the second insulating layer 9 is a second interface connection portion 11 with a central portion protruding in a conical shape, and an outer peripheral portion is a second flange portion 12 protruding in the radial direction.

  The stepped portion 7 is provided with a flexible insulator 13 such as silicon rubber or butyl rubber by applying silicon grease or the like. The flexible insulator 13 has a conical shape with an opening at the center, and has a thickness larger than the depth t of the stepped portion 7. The first flange portion 6 and the second flange portion 12 are fixed with bolts 14 and nuts 15.

  Next, the shape of the flexible insulator 13 will be described with reference to FIG.

  As shown in FIG. 2, the outer diameter φ <b> 1 of the flexible insulator 13 is smaller than the inner diameter φ <b> 2 of the stepped portion 7. For example, when φ2 = 100 mm, φ1 = 98 mm for silicon rubber. Further, the inner diameter φ3 of the flexible insulator 13 is set to be equal to the outer diameter φ4 of the second center conductor 8.

  Thereby, the flexible insulator 13 is compressed by the first interface connection portion 5 and the second interface connection portion 11, and the surface pressure can be applied in the direction parallel to the axial direction by the repulsive force. Further, the surface pressure can be applied also in the inner diameter direction and the outer diameter direction in the direction orthogonal to the axial direction.

  Here, although the outer diameter φ1 of the flexible insulator 13 is smaller than the inner diameter φ2 of the stepped portion 7, the inner diameter of the stepped portion 7 is larger than the size that the flexible insulator 13 is compressed and extends in the outer diameter direction. φ2 is reduced so that a predetermined surface pressure is also applied to the side surface of the stepped portion 7. The surface pressure of the side surface portion is the same as the surface pressure in the direction parallel to the axial direction.

  In the inner diameter direction of the flexible insulator 13, the inner diameter φ 3 and the outer diameter φ 4 of the second central conductor 8 are the same, so that a surface pressure in the direction in which the inner diameter contracts can be applied. The surface pressure in the shrinking direction is the same as the surface pressure in the direction parallel to the axial direction.

  By compressing the flexible insulator 13 in this way, it is defined that the surface pressure in the direction parallel to the axial direction and the direction orthogonal to the axial direction is the same as the surface pressure in the entire interface connection portion. . Here, the same surface pressure in the entire interface connecting portion means that the flexible insulator 13 is in close contact with each other's interface connecting portions 5 and 11 and the second central conductor 8, and even a small gap is partially formed. It means that the insulating characteristics are kept good. In the case where the end of the second insulating layer 9 is extended and an insulating coating is provided around the second central conductor 8 in the stepped portion 7, the inner peripheral portion of the flexible insulator 13 is in close contact with the insulating coating. And

  If the outer diameter φ1 of the flexible insulator 13 is extremely smaller than the inner diameter φ2 of the stepped portion 7, even if the flexible insulator 13 extends in the outer diameter direction, the surface pressure on the side surface portion of the stepped portion 7 is reduced. A gap is formed without adding. On the contrary, if the outer diameter φ1 of the flexible insulator 13 is as large as the inner diameter φ2 of the stepped portion 7, an excessive surface pressure is applied to the side surface portion of the stepped portion 7, and the interface connecting portions 5 and 11 are Uneven surface pressure is applied. For this reason, it is important that the outer diameter φ1 is made smaller than the inner diameter φ2 before the flexible insulator 13 is compressed and a predetermined surface pressure is applied to the side surface portion of the stepped portion 7 after the compression.

  If the inner diameter φ3 of the flexible insulator 13 is too large than the outer diameter φ4 of the second center conductor 8, a surface pressure is not applied to the second center conductor 8 to form a gap. On the contrary, if the inner diameter φ3 is smaller than the outer diameter φ4, an excessive surface pressure is applied, and a non-uniform surface pressure is applied to the interface connecting portions 5 and 11.

  According to the electrical apparatus connecting apparatus of the first embodiment, the outer diameter φ1 of the flexible insulator 13 disposed in the stepped portion 7 is larger than the inner diameter φ2 of the stepped portion 7 provided in the first interface connecting portion 5. The surface pressure obtained by compressing the flexible insulator 13 is the same in the direction parallel to the axial direction and in the direction perpendicular to the axial direction. In other words, a minute gap or the like is not formed even partially, and the insulating characteristics can be improved.

  In the first embodiment, the stepped portion 7 is provided on the first insulating layer 3 side. However, even when the stepped portion 7 is provided on the second insulating layer 9 side, the direction parallel to the axial direction and perpendicular to the axial direction are provided. The surface pressure in the direction can be the same.

  Next, an electrical apparatus connecting apparatus according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view illustrating a configuration of a connection device for an electrical device according to a second embodiment of the present invention. The second embodiment differs from the first embodiment in that a temperature change absorbing portion is provided in the step portion. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, a temperature change absorbing portion 16 that absorbs the swelling of the flexible insulator 13 that expands due to a temperature change is provided on the side surface portion of the stepped portion 7. In general, the connecting device is assembled at room temperature, and the temperature rises when the electric device is in an operating state. For this reason, the temperature change absorption part 16 having a size that absorbs the expansion of the flexible insulator 13 is expected in consideration of a temperature increase of several tens of degrees Celsius.

  According to the electrical apparatus connecting apparatus of the second embodiment, in addition to the effects of the first embodiment, the surface pressure of the interface connecting portions 5 and 11 can be made more uniform.

Sectional drawing which shows the structure of the connection apparatus of the electric equipment which concerns on Example 1 of this invention. The figure which decomposes | disassembles and shows the structure of the connection apparatus of the electric equipment which concerns on Example 1 of this invention. Sectional drawing which shows the structure of the connection apparatus of the electric equipment which concerns on Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a 1st electric equipment 1b 2nd electric equipment 2 1st center conductor 3 1st insulating layer 4 Connection part 5 1st interface connection part 6 1st flange part 7 Step part 8 Second center conductor 9 2nd insulating layer 10 Contactor 11 2nd interface connection part 12 2nd flange part 13 Flexible insulator 14 Bolt 15 Nut 16 Temperature change absorption part

Claims (3)

A first electrical device having a first interface connection that is conically recessed;
A stepped portion having a predetermined depth provided in the first interface connecting portion;
A flexible insulator disposed in the stepped portion;
A second electrical device having a second interface connection portion projecting in a conical shape connected to the first interface connection portion via the flexible insulator;
The apparatus for connecting an electrical device, wherein the surface pressure is made the same throughout the interface connecting portions when the flexible insulator is compressed.   2. The electrical apparatus connection device according to claim 1, wherein the flexible insulator has a thickness larger than a depth of the stepped portion and an outer diameter smaller than an inner diameter of the stepped portion. .   The electrical apparatus connecting device according to claim 1, wherein a temperature change absorbing portion in which the flexible insulator expands due to a temperature rise is provided on a side surface portion of the stepped portion.

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