JPS6031387Y2 - Termination of flexible gas insulated coaxial cylindrical circuit - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a termination part of a flexible gas-insulated coaxial cylindrical electrical circuit.

(Prior art) Conventional gas-insulated coaxial cylindrical electrical circuits used as conduit aerial cables, etc. are often of the rigid type, and due to transportation problems, the length of each unit is approximately 18 m. It has the disadvantage that the number of joints increases when it is laid down, and that it cannot be manufactured continuously.

In order to improve these shortcomings, conductors such as copper stranded wire and copper wire are used, and the conductor is housed in a flexible conductor storage tube such as a corrugated stainless steel pipe, and this is coaxially placed inside the flexible sheath. A flexible gas-insulated coaxial cylindrical electrical circuit has been proposed, which is housed in a shape and gas-insulated between them.

Such a flexible gas-insulated coaxial cylindrical electrical circuit has flexible performance and can be wound onto a drum, so long lengths can be manufactured continuously, and the number of joints can be significantly reduced when installed. There are advantages such as being able to reduce

By the way, in the case of such a flexible gas-insulated coaxial cylindrical electric circuit, the conductor is housed in a flexible conductor storage tube made of a corrugated tube, so a conductor pull-out rod is connected to the tip of the flexible conductor storage tube to remove the tip of the insulated tube. It has a drawback that it is difficult to create an airtight structure with sufficient conductive performance in the part where it is drawn out.

In other words, in such electrical circuits, since the current is carried by the conductor, the conductor lead-out rod must be made of the same metal as the conductor, such as copper, in order to connect it to power transmission lines and heavy electrical equipment. If a conductor pull-out rod made of such a material is used, there is a problem that the material is different from that of a flexible conductor storage tube made of stainless steel or the like, and it cannot be welded, so that an airtight structure cannot be achieved.

Furthermore, if the conductor pull-out rod is made of the same material as the flexible conductor storage tube, such as stainless steel, an airtight structure can be achieved, but there is a problem of increased electrical resistance.

(Purpose of the invention) The object of the invention is to provide a terminal end portion of a flexible gas-insulated coaxial cylindrical electric circuit which can have an airtight structure with sufficient conductivity at the conductor pull-out rod portion.

(Structure of the present invention) In the present invention, a conductor is housed in a flexible conductor housing tube made of a corrugated tube and coaxially housed in a flexible sheath, and the conductor is housed coaxially in a flexible sheath.
The tip of the gas-insulated coaxial cylindrical electric circuit is pulled into the insulator tube by peeling off the flexible sheath, the base of the insulator tube is sealed with a base metal fitting, the tip of the insulator tube is sealed with an end fitting, and the conductor and the At the terminal end of the flexible gas-insulated coaxial cylindrical electrical circuit, the conductor pull-out rod, which is fitted and connected to the outer periphery of the tip of the flexible conductor storage tube, passes through the end fitting in an airtight manner and is led out to the outside. The base side of the conductor pull-out rod is formed of the same metal as the flexible conductor storage pipe, and the tip side is formed of the same metal as the conductor, resulting in a dissimilar metal joining structure. The conductor pull-out rod is fitted with the flexible conductor storage tube and welded to the conductor in an airtight manner, and the tip end of the conductor pull-out rod is crimped to the outer periphery of the conductor.

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

As shown in FIGS. 1 and 2, at the terminal end of the flexible gas-insulated coaxial cylindrical electrical circuit of this embodiment, the tip of the flexible gas-insulated coaxial cylindrical electrical circuit 1 is drawn into the insulator tube 2.

A flexible gas-insulated coaxial cylindrical electric line 1 is constructed by storing a conductor 3 such as a copper stranded wire or a copper wire in a flexible conductor housing tube 4 such as a corrugated stainless steel tube or a corrugated aluminum tube, and then It is housed in a flexible sheath 5 made of a tube or corrugated aluminum tube via an insulating spacer 6, and the S
It has a gas insulated structure with an insulating gas 7 such as F6 or CGI□F2.

In such a flexible gas-insulated coaxial cylindrical electric circuit 1, the flexible sheath 5 is cut off at the tip to expose the flexible conductor housing tube 4, and the exposed portion of the flexible conductor housing tube 4 is attached to the conductor 3 as well as the insulator tube 2. being pulled inside.

The base of the insulator tube 2 is sealed with a base metal fitting 8.

In addition, 9 indicates the insulator tube 2, the base metal fitting 8, and the flexible sheath 5.
This is an electric field mitigation fitting that alleviates the electric field at the connection part with the

A conductor pull-out rod 10 is attached to the tip of the conductor 3 covered with the flexible conductor storage tube 4.

The conductor pull-out rod 10 has a base side 10A made of a metal such as stainless steel or aluminum that is the same as the flexible conductor storage tube 4, and a distal end side 10B made of a dissimilar metal such as copper that is the same as the conductor 3. It has a bonded structure.

Bonding of dissimilar metals can be easily produced by friction welding or the like.

The base side 10A of such a conductor pull-out rod 10 is screwed into the outer periphery of the flexible conductor storage tube 4 and is airtightly attached at a welded portion 11.

In this case, the weld 11 is a weld of the same type of metal, so
It can be easily welded and can be easily made into an airtight structure.

The tip end side 10B of the conductor pull-out rod 10 is fitted onto the outer periphery of the conductor 3 and is crimped and connected.

A mandrel 12 is inserted at the tip of the conductor 3 to ensure good crimping.

The tip of the insulator tube 2 is sealed with an end fitting 1, and a conductor pull-out rod 10 hermetically passes through the end fitting 13 and is drawn out to the outside.

That is, an insulator tube upper flange 15 is airtightly attached to the outer periphery of the tip of the insulator tube 2 with cement 14, and an OIJ ring 1 is attached thereon.
An end fitting 13 is mounted via 6.

This end fitting 13 is airtightly fixed to the end of the insulator tube 2 with bolts 17 and nuts 18.

A conductor pull-out rod 10 is passed through the center of the end fitting 13.

The end fitting 13 has a cylindrical portion 13a surrounding the conductor pull-out rod 10.
An O-ring 19 and a press ring 20 for pushing the O-ring 19 are inserted between the cylindrical portion 13A and the conductor pull-out rod 10.

The push ring 20 and the conductor pull-out rod 10 are connected by welding in an airtight manner at a welding part 21, and the welding part 2 is connected between the push ring 20 and the cylindrical part 13A.
2 and is airtightly welded.

(Effect of the invention) As explained above, at the terminal end of the flexible gas-insulated coaxial cylindrical electric circuit according to the present invention, the base side of the conductor pull-out rod is made of the same metal as the flexible conductor storage pipe of the electric circuit, and The tip side is made of the same metal as the conductor of the electric circuit, creating a dissimilar metal bonding structure, so the base side can be airtightly welded to the flexible conductor storage tube of the electric circuit because it is the same type of metal, and the tip of the conductor of the electric circuit Since both sides are made of the same type of metal, they can be easily crimped and connected with low electrical resistance.

Therefore, according to the present invention, it is possible to provide a terminal portion that can easily satisfy both the conductive wire and airtightness at the conductor pull-out rod portion.

[Brief explanation of the drawing]

FIG. 1 is a partially vertical side view of an embodiment of the terminal end according to the present invention, and FIG. 2 is an enlarged sectional view of section A in FIG. 1. 1...Flexible gas insulated coaxial cylindrical electric circuit, 2...Insulator tube, 3...Conductor, 4...
... Flexible conductor storage tube, 5 ... Flexible sheath, 7 ... Insulating gas, Death ...
・Base metal fitting, 10... Conductor pull-out rod, IOA...
...Base side, IOB...Tip side, 13.
...End metal fittings.

Claims (1)

[Scope of utility model registration request] A flexible gas-insulated coaxial cylindrical electrical circuit in which a liquid is stored in a flexible conductor storage tube made of a corrugated tube, coaxially stored in a flexible sheath, and gas-insulated between the flexible conductor storage tube and the flexible sheath. The tip of the insulator tube is pulled into the insulator tube by peeling off the flexible sheath, the base of the insulator tube is sealed with a base metal fitting, the tip of the insulator tube is sealed with an end fitting, and the conductor and the flexible conductor storage tube are sealed. At the terminal end of a flexible gas-insulated coaxial cylindrical electric circuit, in which a conductor pull-out rod that is fitted and connected to the outer circumference of the tip passes through the end fitting in an airtight manner and is led out to the outside, the conductor pull-out rod has its base side The flexible conductor storage tube is made of the same metal as the conductor, the tip side thereof is made of the same metal as the conductor to form a dissimilar metal joining structure, and the base side of the conductor pull-out rod is made of the same metal as the conductor storage tube. The flexible conductor is fitted into a pipe and connected by welding in an airtight manner, and the tip end side of the conductor pull-out rod is crimped and connected to the outer periphery of the conductor.
The terminal end of a gas-insulated coaxial cylindrical circuit.