JPH0715293Y2 - Pipeline air cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pipeline air cable.

[Conventional technology]

For example, as shown in FIG. 2, the pipeline air cable is constructed by supporting an aluminum or copper pipe-shaped conductor (12) in a metal sheath (18) by a spacer. Usually, the conductor (12) is supported by the fixed spacer (13) and the moving spacer (11), and the fixed spacer (13) is fixed to the conductor (12) and integrated, and the moving spacer (11) is ,
The conductor (12) is supported so that the conductor (12) can expand and contract. This moving spacer (11), as shown in FIG.
It is composed of a spacer fitting (16) and a resin portion (17) attached to the outer circumference of the fitting (16). The conductor (12) is inserted inside the spacer metal fitting (16), and the metal fitting (16) and the conductor (12) of the spacer are electrically coupled to each other by the bond wire (15) so as to have the same electric potential. Has been done. The bond wire (15) is fixed to the spacer fitting (16) and the conductor (12) with a screw (14).

[Problems to be solved by the device]

The wall thickness of the conductor is required to satisfy the current capacity and the mechanical strength over the entire length. Further, the wall thickness needs to be such that the hole of the bond tap portion to which the screw is attached does not penetrate. This is because when the screw penetrates the conductor, the vacuum does not rise due to a minute leak at the penetrating portion when the inside of the sheath is evacuated. Therefore, a conductor with a small current capacity can be thin, but the minimum conductor thickness is determined by the depth of the bond tap portion. There was a problem that it became thick and the material cost increased.

The present invention has been made in consideration of the above points,
It is an object of the invention to provide a conduit air cable which reduces the material cost of the conductor.

[Means and Actions for Solving Problems]

In order to achieve the above object, the present invention provides a metal sheath,
In a pipeline air cable in which a conductor is supported through a moving spacer composed of a metal fitting and an insulating portion, and the conductor and the metal fitting of the moving spacer are electrically connected by a bond wire, the bond wire has one end It is characterized in that it is attached to a bottomed bond wire attachment member that is hermetically connected to the conductor.

Compared with the conventional case in which the thickness of the conductor is determined by the thickness of the tap portion for bonding by using the above structure,
The thickness of the bond tap is secured by the bottomed bond wire mounting member, and the thickness of the conductor is set to the minimum thickness that satisfies the current capacity and mechanical strength (short-circuit electromagnetic force and stress due to its own weight). By airtightly attaching the attachment member to the thin conductor, the inside and outside of the pipe-shaped conductor can be made airtight, the spacer and the conductor can be kept at the same potential, and the conductor material can be saved.

〔Example〕

The present invention will be described below based on the embodiments shown in the drawings.

FIG. 1 is a sectional view of a main part of a pipeline air cable according to the present invention, in which a movable spacer (1) is integrally formed with a metal fitting (6) and a resin portion (7). ) And the bond wire (5) are attached to the bond wire attachment member (3) with screws (4). The bond wire attachment member (3) has a box shape and is hermetically welded to a hole formed in the thin conductor (2) penetrating the moving spacer (1). The bond wire attachment member (3) has a sufficient thickness with respect to the length of the screw (4) and is bottomed when the screw (4) is fastened.
Bond wire attachment member (3) with the bond wire (5) fixed with screws
When the conductor is welded to the conductor, the inside and outside of the conductor (2) are airtight. In this embodiment, it is clear from FIG. 1 that the conductor material is saved. The method of attaching the bond wire attachment member to the conductor is not limited to the above method.

[Effect of device]

As described above, according to the present invention, one end of the bond wire is configured to be attached to the bottomed bond wire attachment member that is hermetically connected to the conductor, so that the thickness of the conductor satisfies the current capacity and mechanical strength. This has the excellent effect that the cost of the conductor material can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of a pipeline air cable according to the present invention, FIG. 2 is a sectional view of a pipeline air cable, and FIG.
FIG. 1 is a sectional view of a main part of a pipeline air cable of a conventional example. 1,11 …… Movement spacer, 2,12 …… Conductor, 3 …… Bond wire mounting member, 4,14 …… Screw, 5,15 …… Bond wire, 6,16 ……
Metal fittings, 7,17 …… Resin part, 13 …… Fixed spacer, 18 …… Sheath.

Claims (1)

[Scope of utility model registration request] 1. A pipeline air cable in which a conductor is supported in a metal sheath through a moving spacer composed of a metal fitting and an insulating portion, and the conductor and the metal fitting of the moving spacer are electrically connected by a bond wire. In the pipeline air cable, the bond wire is attached to a bottomed bond wire attachment member, one end of which is hermetically connected to a conductor.