JPS5825716Y2 - Power cable connection with internal cooling tube - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a power cable connection section with an internal cooling tube.

Demand for electric power has increased in recent years, and large-capacity power transmission is desired.

In order to increase the current capacity, it is desirable to cool the conductor, and as a power cable for cooling the conductor, there is a power cable with an internal cooling tube.

This cable consists of twisted conductors around the outer periphery of a cooling pipe through which refrigerant flows, and a sheath provided on the outer periphery with an insulating layer interposed therebetween.

In order to connect the cooling pipes described above, as shown in Fig. 1, the cooling pipes 1 are welded to each other, and a conductor 2
They are welded together, an insulating reinforcing layer 3 is provided on the outer periphery, and an external tube 4 is attached.

However, at the above-mentioned connection portion, foreign matter may enter the internal cooling pipes when the internal cooling pipes 1 are welded to each other.

There are also cases where the airtightness of welded joints is checked, and it is necessary to easily perform this airtightness check.

The present invention provides an electric cable connection section with an internal cooling tube that prevents foreign matter from entering the internal cooling tube during welding connection and allows the airtightness of the welded connection section to be easily checked.

An embodiment of the present invention will be described with reference to FIG. 2. A conductor 2 is welded to the outer periphery of an internal cooling pipe 1 which is welded.
The point that a reinforcing insulating layer (not shown) and an external pipe (not shown) are provided on the connection part is the same as the conventional one, but in the present invention, the inner circumferential surface of the welded connection position 1' of the internal cooling pipe 1 is color 5
is inserted.

The collar 5 is a metal tube whose outer diameter is approximately equal to or slightly smaller than the inner diameter of the internal cooling pipe 1, and a gasket 6 is disposed on the outer peripheral surface of the end thereof. It is airtightly attached to the inner peripheral surface of the cooling pipe 1.

Also, holes 7 are provided on both sides of the welding connection position 1' of the internal cooling pipe 1, passing through in the thickness direction.

To configure the connection section with the above configuration, proceed as follows.

1. First, insert the collar 5 about half way into one of the internal cooling pipes 1 to be welded, and while holding the collar 5, insert the collar 5.
The other internal cooling pipe 1 is located on the outer periphery.

Next, if necessary, the internal cooling pipe at the position where the collar 5 is inserted is squeezed from the outer periphery.

This allows the collar 5 to be more airtightly attached to the inner circumferential surface of the internal cooling pipe 1.

Next, the internal cooling pipes 1 are connected by welding 1/.

The collar 5 can prevent foreign matter from entering the internal cooling pipe during this welding connection work.

Further, when it is necessary to check the welding condition of the internal cooling pipes 1, gas is filled in through holes 7 provided on both sides of the welding position 1'.

That is, for example, after applying soapy water to the outer periphery of the welding connection position 1', gas is sealed through the hole, and the welding condition (airtightness) of the welding connection position 1' can be confirmed by checking whether the soapy water expands or not.

This confirmation hole 7 is closed by welding or the like.

Thereafter, the conductors are welded together 2'. When welding these conductors together, a protective plate 8 is attached to the outer periphery of the internal cooling pipe 1 as shown in the figure to prevent the heat generated when welding the conductors together from having a negative effect on the welded part 1' of the internal cooling pipe 1. It is preferable to do so.

When the internal cooling pipe 1 is narrowed, there is an advantage that the protection plate 8 does not become a convex portion, making it easier to weld the conductors together.

Thereafter, a reinforcing insulating layer (not shown) and an outer tube (not shown) are sequentially provided.

In addition, in the above embodiment, the internal cooling pipe was narrowed down, but
If airtightness of the collar can be obtained, there is no need to perform any particular squeezing.

A protective plate may also be provided as necessary.

As described above, in the present invention, the collar is attached to the inner circumferential surface of the welded connection position of the internal cooling pipe so that the outer circumferential surface of the end is airtight to the inner circumferential surface of the internal cooling pipe. It is possible to prevent foreign matter from entering the internal cooling pipe during the welded connection of the internal cooling pipe, and the welded connection state of the internal cooling pipe can be easily checked using the hole provided in the internal cooling pipe.

If the collar is not attached, checking the welded connection status would require filling the entire internal cooling pipe with gas, which would be a very difficult task.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway cross-sectional view of a conventional internal cooling pipe interconnection cable, and FIG. 2 is an enlarged upper half cross-sectional view of the main part of the internal cooling pipe interconnection cable according to the present invention. 1 is an internal cooling pipe, 2 is a conductor, 3 is an insulation reinforcing layer, 4 is an external pipe, and 5 is a collar.

Claims (1)

[Scope of utility model registration request] A conductor is welded to the outer circumference of the welded internal cooling pipe.
In the electrical cable connection part with an internal cooling pipe, in which a reinforcing insulating layer and an external pipe are provided on the connection part, a collar is inserted into the inner circumferential surface of the welded connection position of the internal cooling pipe,
A gasket is disposed on the outer circumferential surface of the end of the collar, and the gasket is airtightly attached to the inner circumferential surface of the internal cooling pipe, and on both sides of the welded connection position of the internal cooling pipe, a gasket is provided in the thickness direction. A power cable connection part with an internal cooling pipe characterized by having a through hole.