JP3425275B2 - Bushings for power distribution equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bushing provided with a conductive member, an insulating coating for covering the conductive member, and an outward flange which is integrated in series with the insulating coating to cover the conductive member. , Or a conductive member, a coated electric wire electrically connected to one end of the conductive member, an insulating coating body for coating the coated electric wire and the conductive member, and integrated in series with the insulating coating body, A bushing having an outward flange covering a conductive member, which penetrates through a case of a power distribution device in an insulated state and is attached to the case by a flange portion of the outward flange, and an electrode housed in the case and the outside. The present invention relates to a bushing for power distribution equipment that is connected to the electric wire of.

[0002]

2. Description of the Related Art Generally, a bushing for a power distribution device is composed of a conductive member made of metal and a porcelain insulator for fitting the conductive member in a watertight manner and is a switch which is a power distribution device. It is attached to a case such as a circuit breaker so as to penetrate therethrough in an insulating state, and functions to connect an electrode housed in the case and an external electric wire.

By the way, in the bushing, since the insulator is made of porcelain, the bushing has a considerable weight and low impact resistance, and the bushing is attached to the case of the power distribution device, and the bushing is attached. The work of mounting the installed distribution equipment requires careful work and considerable effort.

Therefore, in the bushing for power distribution equipment, the weight is reduced and the shock resistance is improved, and the work of mounting the bushing on the case of the power distribution equipment and the work of mounting the power distribution equipment to which the bushing is mounted are performed. Improvement and reduction of labor are required. To handle such a request,
European Patent Application Publication No. 0446404A1 proposes a so-called polymer bushing in which an insulating coating body that covers a conductive member is formed of synthetic resin and / or synthetic rubber instead of a porcelain bushing. There is.

In the polymer bushing, the conductive member is composed of two first and second rods made of metal, and the insulating coating is made of the first epoxy resin coating the first rod. And a second covering made of an elastomer for covering the second rod, both rods being connected to each other by a fastening means provided between the two, and the second covering. Is fitted and fixed to the outer periphery of the first cover by the tightening action of the tightening means of both rods, with one end of the first cover being fitted onto one end of the first cover. In the polymer bushing, a metal flange is fixed to the outer periphery of the first cover and is attached to the case of the power distribution device via the flange.

[0006]

As described above, in the polymer bushing, since the insulating coating is composed of the first coating made of epoxy resin and the second coating made of elastomer, the insulating Compared to a porcelain bushing whose cover is made of porcelain, it has characteristics of being lightweight and having high impact resistance. However,
The polymer bushing has a complicated structure as compared with the conventional porcelain bushing, resulting in an increase in cost, and further, an assembly work for assembling the bushing itself is required.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a bushing for electric power distribution equipment which is lightweight, has high impact resistance, has a simple structure, and does not require its own assembly work.

[0008]

The first invention of the present invention is as follows:
A conductive member, an insulating coating body that covers the conductive member, and an outward flange that is integrated in series with the insulating coating body to cover the conductive member, and penetrates the case of the power distribution device in an insulated state A bushing for a power distribution device, which is attached to the case at a flange portion of an outward flange and connects an electrode housed in the case and an external electric wire, wherein the insulating cover is made of synthetic rubber. With
The outward flange is made of a hard synthetic resin.

A second invention of the present invention is the same as a conductive member, a covered electric wire electrically connected to one end of the conductive member, an insulating covering body covering the covered electric wire and the conductive member, An insulative flange that is integrated in series with the insulating cover and covers the conductive member is provided, the insulative hole is penetrated through the case of the power distribution device, and is attached to the case at the flange portion of the outward flange. A bushing for a power distribution device that connects an electrode housed inside and an external electric wire, wherein the insulating coating is formed of synthetic rubber, and the outward flange is formed of hard synthetic resin, A core wire exposed at a connection portion of the coated electric wire with the conductive member is bonded to the insulating coating body.

In the bushing for a power distribution device according to each invention of the present invention, it is preferable that the insulating coating is made of silicone rubber or ethylene-propylene rubber and the outward flange is made of epoxy resin.

[0011]

In the bushings for electric power distribution equipment according to the first and second aspects of the present invention thus configured, the insulating coating is made of synthetic rubber and the outward flange is made of synthetic resin. Since it is formed as a single piece, it is lighter in weight and has better impact resistance than a porcelain bushing, and it also has only one conductive member, an insulating cover, and an outward flange integrated therewith. The structure is simpler than that of the conventional polymer bushing described above, the manufacturing cost is low, and the assembling work itself is not required.

Particularly, in the bushing, the outward flange integral with the insulating cover is made of a hard synthetic resin, preferably epoxy resin, and the outward flange itself has sufficient rigidity, so that the power distribution equipment It can be attached directly to the case with an outward flange.

Further, in the bushing for electric power distribution equipment according to the second aspect of the present invention, it is of course possible to obtain the same effect as the bushing according to the first aspect of the present invention, which is connected to the conductive member. Since the covered electric wire is integrally provided, there is an advantage that connection with a power distribution line becomes very easy.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a bushing for power distribution equipment according to the present invention. The bushing includes a conductive member 11, a covered electric wire 12, an insulating cover 13, and an outward flange 14. Conductive member 11
Is a rod-shaped member made of metal, and has a mounting hole 11a for connection of the covered electric wire 12 formed at one end side and a screw portion 11b for electrode connection formed at the other end side. The mounting hole 11a is formed coaxially with the conductive member 11 and extends from the one end side of the conductive member 11 in the axial direction by a predetermined depth.

The covered electric wire 12 is the same covered electric wire as the distribution electric wire, and the outer periphery of the core wire 12a is covered with a covering body 12b made of ethylene-propylene rubber.
The covered electric wire 12 has an appropriate length, and the core wire 12a protrudes from the covered body 12b by a predetermined amount on one end side, and the protruding portion of the core wire 12a is attached to the mounting hole 11a on one end side of the conductive member 11.
, And is electrically connected to one end of the conductive member 11 by compressing the peripheral wall of the mounting hole 11a.

The insulating cover 13 is made of silicone rubber, ethylene-propylene rubber, or the like.
The conductive member 11 and the covered electric wire 12 are configured to include a tubular portion 13a that covers a part thereof, and a plurality of disc-shaped umbrella portions 13b that are integrally formed on the outer periphery of the tubular portion 13a.

The outward flange 14 is made of epoxy resin, and has a tubular portion 14a and an outward flange portion 14b integrally formed at the center of the tubular portion 14a in the longitudinal direction.
It is composed of and. The outward flange 14 covers the other end side of the conductive member 11 with its tubular portion 14a so as to cover the conductive member 1
1 is fixed to the outer periphery of the cylindrical portion 14a, and one end side of the cylindrical portion 14a is fitted in the conical recess 13c on the other end side of the insulating coating 13 and is fixed to the insulating coating 13 in series. . As a result, the conductive member 11 is formed with the highly rigid flange portion 14b protruding toward the outer peripheral side thereof.

The insulating coating 13 includes a conductive member 11, an outward flange 14 fixed to the outer periphery of the conductive member 11, and a part of the coated electric wire 12 connected to one end of the conductive member 11 in a predetermined molding die. In this state, it is integrally molded with them. The insulating coating 13 is one end side of the conductive member 11,
And one end side of the tubular portion 14a of the outward flange 14 is insulated and coated, and the coated electric wire 12 is insulated from the connection portion with the conductive member 11 to the coated side, and the outward flange 1
The cylindrical portion 14a of No. 4 is insulated and coated with the other end of the conductive member 11 left. As a result, the covered electric wire 12 projects from one end of the insulating cover 13, and the other end of the conductive member 11 projects from the other end of the tubular portion 14 a of the outward flange 11.

As described above, in the bushing,
Since the insulating coating 13 is made of silicone rubber or ethylene-propylene rubber or the like, and the outward flange 14 is made of epoxy resin, it is lighter in weight and more excellent in impact resistance than a porcelain bushing. Of course, one conductive member 11, an insulating coating 13,
Since the structure is provided with the outward flange 14, the structure is simple and the manufacturing cost is low as compared with the conventional polymer bushing described above.

In the bushing, however, in particular, the outward flange 14 integrally provided with the insulating coating 13 is provided.
Is made of epoxy resin, and the flange portion 14b
Has sufficient rigidity, so even if the bushing is directly attached to the case of the power distribution device with the flange portion 14b,
The bushing can be installed in a strong and stable state. Therefore, in the bushing, unlike the conventional polymer bushing, it is not necessary to provide the insulating coating with the metal outward flange portion for mounting to the case, and in this respect, the structure of the bushing can be made simpler. .

Further, since the bushing is integrally provided with the covered electric wire 12 connected to the conductive member 11, there is an advantage that the connection with the power distribution line becomes very easy.

FIG. 2 shows a modification of the bushing shown in FIG. In the bushing of the modified example,
At the connecting portion between the conductive member 11 and the covered electric wire 12, the core wire 12 a forming the covered electric wire 12 is attached to the mounting hole 1 of the conductive member 11.
The exposed portion 12a1 is exposed for a predetermined length from 1a, and the exposed portion 12a1 is bonded to the cylindrical portion 13a of the insulating cover 13. As a result, in the bushing, water is prevented from entering and staying in the joint through the gap between the core wire 12a of the covered electric wire 12 and the cover 12b, and expansion of the staying water due to freezing and the like causes the water to remain in the joint. It is possible to prevent breakage.

FIG. 3 shows a second bushing according to the present invention.
Is shown. The bushing includes a conductive member 15, an insulating cover 16, and an outward flange 17. The conductive member 15 is a rod-shaped member made of metal, and has a connecting portion 15a for a distribution line formed on one end side and a screw portion 15b for connecting an electrode on the other end side. In the bushing, the conductive member 1
5 is different from the bushing according to the first embodiment in that it is not provided with a covered electric wire, but in other respects it has the same configuration and has the same operational effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a first embodiment of a bushing for power distribution equipment according to the present invention.

FIG. 2 is a partially cutaway side view showing a part of a modified example of the bushing.

FIG. 3 is a partially cutaway side view showing a second embodiment of a bushing for power distribution equipment according to the present invention.

[Explanation of symbols]

11, 15 ... Conductive member, 12 ... Coated electric wire, 13, 16 ...
Insulating coating, 13a ... Cylindrical part, 13b ... Umbrella part, 14, 17
... outward flange, 14a ... cylinder part, 14b ... flange part.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Ishida, No. 2-56, Sudacho, Mizuho-ku, Nagoya-shi, Aichi Japan Insulators Co., Ltd. (72) Takayuki Miura, Inuyama City, Aichi Prefecture, 1st upper needle, Energy Support Incorporated (72) Inventor Kazunori Goto 1 Inouyama City, Aichi Prefectural upper hand needle Energy Support Co., Ltd. (58) Fields investigated (Int.Cl. ⁷ , DB name) H01B 17/00-17/54 H01H 33 / 53

Claims (3)

(57) [Claims] 1. A conductive member, an insulating coating body that covers the conductive member, and an outward flange that is integrated in series with the insulating coating body and covers the conductive member. A bushing for a power distribution device, which is attached to the case at the flange portion of the outward flange and is connected to an electrode housed in the case and an external electric wire, the insulating cover being synthesized. A bushing for a power distribution device, which is formed of rubber and the outward flange is formed of a hard synthetic resin. 2. A conductive member, a coated electric wire electrically connected to one end of the conductive member, an insulating coating body for coating the coated electric wire and the conductive member, and a serial integration with the insulating coating body. An outer flange that covers the conductive member, penetrates through the case of the power distribution device in an insulated state, is attached to the case by the flange portion of the outward flange, and the electrode housed in the case and the outside A bushing for a power distribution device for connecting with the electric wire of, wherein the insulating cover is formed of synthetic rubber, and the outward flange is formed of a hard synthetic resin, with the conductive member of the covered electric wire. A bushing for a power distribution device, wherein a core wire exposed at a connection portion is bonded to the insulating coating. 3. The bushing according to claim 1, wherein the insulating coating is made of silicone rubber or ethylene-propylene rubber, and the outward flange is made of epoxy resin. Bushing for equipment.