JPH0214280Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a connecting portion of a flexible conduit aerial cable.

[Prior technology] As a flexible high power transmission cable, an insulating spacer is installed between an internal corrugated sheath and an external corrugated sheath that are placed over a stranded conductor, and an insulating gas is placed inside the external corrugated sheath. Pipeline aerial cables have been developed that enclose ducts, but such cables require complicated connection work at the installation site.

As a connection part of such a conduit aerial cable,
As shown in the flexible conduit aerial cable connection section of JP-A No. 57-202814, a metal tube with a bottom is placed over the end of the cable conductor, a gas-stop insulating spacer is attached, and a metal tube with a connector is attached to the external corrugated metal sheath. A gas stop connection is known, in which a cable conductor is connected to a cable conductor, a connection box with a connector is placed over the cable conductor, and both ends of the box are welded to the fixture.

[Problem to be solved by the invention] In the connection section of the above-mentioned conduit aerial cable, the pipe diameter of the connection box must be larger than the diameter of the external corrugated metal sheath of the cable.
It is not possible to use an insulating spacer with the same dimensions as the insulating spacer used in the cable, and a metal tube with a connector or fixing metal fittings must be used, which not only complicates the process of connecting the external corrugated metal sheath. However, there were problems in that the connecting portion had a large diameter, making it difficult to handle, requiring a large installation space, and increasing costs.

Therefore, in the present invention, by configuring the connection part to have approximately the same diameter as the flexible conduit aerial cable, the insulating spacer of the cable can be used as is at the connection part, and the outer corrugated metal sheath can be used as is. It is an object of the present invention to provide a flexible conduit aerial cable connection part that facilitates connection work, has a small-sized connection part, is economical, and is easy to handle.

[Means for Solving the Problems] In order to achieve the above object, the flexible conduit aerial cable connection section of the present invention includes a stranded conductor 1,
An external corrugated sheath 2, an external corrugated sheath 4, a split spacer 6, and an external corrugated sheath airtightly welded to the terminal portion of the external corrugated sheath 4 at the connecting end of a conduit aerial cable containing an enclosed insulating gas. Sheath connection tube 5, 5
Then, short connecting pipes 7, 7 having the same inner diameter as the outer corrugated sheath 4 and a slightly larger outer diameter than the outer diameter of the outer corrugated sheath 4 are airtightly welded, and each short connecting pipe 7,
Split spacers 6, 6 are installed inside the short connecting pipe 7, and both ends of the long connecting pipe 8, which has an inner diameter approximately the same as the outer diameter of the short connecting pipe 7, are connected to the short connecting pipes 7, 7.
It is welded airtightly to the top.

[Function] The above-mentioned stranded conductor 1 is housed in an internally corrugated sheath 2, which is separated from the externally corrugated sheath by a split spacer 6 installed between the internally corrugated sheath 2 and the externally corrugated sheath 4. 4, and the inner and outer sheaths are corrugated sheaths, making the conduit aerial cable a flexible cable.

Each cable conductor to be connected is connected to its stranded conductor and internal corrugated sheath, and then the terminal portion of each external corrugated sheath 4, 4 is connected to an external sheath connecting tube 5, 5, a short connecting tube 7, 7. , and long connecting pipe 8
Connected by

A short connecting tube 7 is connected to the outer sheath connecting tube 5 connected to the end of the external corrugated sheath 4, and the inner diameter of this short connecting tube 7 is formed to be the same as the inner diameter of the outer corrugated sheath 4. As a result, it is possible to use a two-split spacer installed at the connecting portion in contact with the inner surface of the short connecting pipe 7 having the same diameter as the spacer used for the air conduit cable.

Also, the outer diameter of the short connecting pipe 7 is adjusted to the outer corrugated sheath 4.
By forming the long connecting pipe 8 to have an outer diameter slightly larger than the outer diameter of the short connecting pipe 7, and forming the inner diameter of the long connecting pipe 8 connected to the outer periphery of the short connecting pipe 7 to be approximately the same diameter as the outer diameter of the short connecting pipe 7, The elongated connecting pipe 8 has a diameter slightly larger than that of the external corrugated sheath 4, so that the connecting portion is small instead of having a large diameter.

[Example] Hereinafter, an example of the flexible conduit aerial cable connection section of the present invention will be described with reference to the drawings.

Both conduit aerial cables to be connected each have a stranded conductor 1, 1, an internal corrugated metal sheath 2, 2 directly placed on the stranded conductor 1, 1, an outer external corrugated metal sheath 4, 4. The internally corrugated sheath 2, 2
and two split spacers 6, 6 which are interposed between the external corrugated sheaths 4, 4 and support the internal corrugated sheaths 2, 2 at the axial center positions of the external corrugated sheaths 4, 4,
The installed cable is normally filled with an insulating gas inside the outer corrugated sheath 4.

To connect both cables, the stranded conductors 1, 1 are connected to each other, the internal corrugated sheaths 2, 2 are connected to each other, the external corrugated sheaths 4, 4 are connected to each other, but both The end portions of the stranded conductors 1, 1 are extended longer than the end portions of the internally corrugated sheaths 2, 2, and the butted conductor ends are welded and connected.

Each terminal portion of the internally corrugated sheaths 2, 2 extends longer than the terminal portions of the externally corrugated sheaths 4, 4, and an internal sheath connecting tube is provided on the outer periphery of each internally corrugated sheath terminal portion. One end of the inner sheath connecting tubes 3, 3 is welded airtightly, and the butt joints of the tips of the inner sheath connecting tubes 3, 3 are welded airtightly.

Each of the terminal portions of both external corrugated sheaths 4, 4 is made by airtightly welding the end portion of an external sheath connecting tube 5, 5 to the inner peripheral surface of the terminal portion, respectively.
5 is made to protrude outside the terminals of the external corrugated sheaths 4, 4.

7, 7 is a short connecting pipe, the inner diameter of this short connecting pipe is approximately the same as the inner diameter of the outer corrugated sheaths 4, 4, and its outer diameter is slightly larger than the outer diameter of the outer corrugated sheaths 4, 4. to form.

The respective proximal ends of both the short connecting tubes 7, 7 are fitted onto the outer peripheral surfaces of the outer sheath connecting tubes 5, 5 protruding from the terminal portions of the outer corrugated sheaths 4, 4, respectively, and the outer sheath connecting tubes Gaskets 9, 9 for preventing metal powder from entering during welding are sandwiched between the outer circumferential surfaces of the short connecting tubes 5, 5 and the inner circumferential surfaces of the short connecting tubes 7, 7, and the short connecting tubes 7, 7 are connected to the external sheath. It is welded to the pipes 5, 5 airtightly.

Two split spacers 6, 6 are installed between the inner circumferential surfaces of the tips of the short connecting tubes 7, 7 installed in this way and the end portions of the internally corrugated sheaths 2, 2, and both short connecting tubes 7, 7 are installed. The tips of each are placed opposite each other with a space between them.

Reference numeral 8 denotes a long connecting pipe, the inner diameter of which is approximately the same as the outer diameter of the short connecting pipes 7, 7. This long connecting pipe 8 is inserted in advance over the external corrugated sheath 4 of one of the cables to be connected, and is inserted over the short connecting pipes 7, 7 whose ends are facing each other with a gap between them. The long connecting pipe 8 is drawn so that both ends of the long connecting pipe 8 fit together, and a weld is made between the outer peripheral surface of each short connecting pipe 7 and the inner peripheral surface of both ends of the long connecting pipe 8. The two ends of the long connecting tube 8 are hermetically welded onto the short connecting tubes 7, 7, respectively, by sandwiching the gaskets 9, 9 for preventing the intrusion of metal powder.

As described above, the present invention airtightly connects the terminal parts of the external corrugated sheaths 4, 4 with the external sheath connecting tubes 5, 5, the short connecting tubes 7, 7, and the long connecting tube 8, and the external corrugated sheath The flexible conduit aerial cable connection section is constructed by sealing and filling insulating gas into the tubes 4, 4.

[Effects of the invention] As mentioned above, the flexible conduit aerial cable connection part of the invention uses a short connecting pipe having an inner diameter that is the same as the inner diameter of the external corrugated sheath. 6 can be used as is for the connection part, and no special spacer is required at the external corrugated sheath joint part, making it economical.

In addition, the outer diameter of the short connecting tube is made slightly larger than the outer diameter of the external corrugated sheath, and the inner diameter of the long connecting tube connected to the outer periphery of this short connecting tube is approximately the same as the outer diameter of the short connecting tube. By changing the diameter, the long connecting pipe has a diameter that is slightly larger than the external corrugated sheath, making the connecting part smaller, making it easier to handle and not requiring a large installation space, making it economical. Become.

Furthermore, there is no risk of metal powder entering the external corrugated sheath during welding, making it possible to obtain a conduit aerial cable connection portion with excellent electrical characteristics.

[Brief explanation of the drawing]

The figure is a sectional view of the upper half of an embodiment of the present invention. 1: Stranded wire conductor, 2: Internally corrugated sheath, 4: Externally corrugated sheath, 5: External sheath connecting tube, 6: Split spacer, 7: Short connecting tube, 8: Long connecting tube.

Claims (1)

[Scope of utility model registration request] At the connecting end of a conduit aerial cable having a stranded conductor 1, an internal corrugated sheath 2, an external corrugated sheath 4, a split spacer 6, and a sealed insulating gas, the terminal portion of each external corrugated sheath 4, 4 A short connecting pipe 7 having an outer diameter that is the same as the inner diameter of the outer corrugated sheath 4 and slightly larger than the outer diameter of the outer corrugated sheath 4 is attached to the outer sheath connecting pipes 5, 5 which are airtightly welded to the terminal portions thereof. . 8 is airtightly welded onto both short connecting pipes 7, 7 to form a flexible conduit aerial cable connection section.