JPH0135542Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of an oil stop joint for an OF cable.

[Technical background of the invention] A conventional oil stopper connection portion of an OF cable is configured as shown below, for example.

That is, as shown in FIG. 1, the conductor ends 2, 2' of the OF cables 1, 1' on both sides to be connected are connected by a conductor connecting tube 3, and a A pair of tightening nuts 4, 4' are threadedly fitted. Further, an oil stopper unit 6 made of thermosetting resin such as epoxy resin and having a shield electrode 5 embedded therein is provided on the outside of the conductor connecting pipe 3 so as to surround it. The exposed end of is electrically and mechanically connected to the conductor connecting pipe 3 by the tightening nuts 4, 4'. Furthermore, a wound layer 7 of oil-impregnated insulating paper is provided on the outer periphery of the oil stopper unit 6 made of thermosetting resin without coming into contact with the shield electrode 5, thereby insulating the OF cables 1 and 1' on both sides. At the ends of the layers 8, 8', electric field relaxation means 11, 11' are provided, respectively, consisting of seat insulating layers 9, 9' made of oil-impregnated insulating paper and epoxy bell mouths 10, 10'. Further, if necessary, an insulating tube 12 is fitted over the outer periphery of the epoxy bell mouths 11, 11' on both sides and the oil stopper unit 6, and these connection elements are connected to the connection case 1.
It is housed in 3.

Also, both ends of the connection case 13 are connected to the OF on both sides.
They are fixed onto the sheaths of the cables 1, 1' by lead wires 14, 14'.

[Problems in the Background Art] However, in the oil stopper connection having such a structure, the conductor connecting pipe 3 is made of aluminum, but the tightening nuts 4, 4' that are screwed into it are hard due to this. Since it is made of brass, the conductor connection tube 3 is scraped off into powder when the tightening nuts 4, 4' are screwed in, and this aluminum powder floats inside the oil stopper connection and deteriorates the electrical characteristics. There was a problem.

[Purpose of the invention] The present invention has been made to solve such problems, and its purpose is to provide an oil stopper connection for an OF cable that is easy to assemble and has good electrical characteristics.

[Summary of the invention] The invention consists of fixing a pair of brass annular members with threads on the outer periphery onto an aluminum conductor connection pipe, and attaching brass fasteners to the threads of these annular members. This oil stopper connection part for an OF cable is characterized in that a conductor connection pipe and a shield electrode are electrically and mechanically connected by screwing a nut therein.

[Embodiments of the invention] The invention will be described below based on embodiments shown in the drawings. FIG. 2 is an enlarged longitudinal sectional view showing the main parts of an embodiment of the present invention, and all other parts not shown have the same structure as the conventional oil stop joint shown in FIG. 1. It is becoming.

In Fig. 2, numeral 15 indicates both sides to be connected.
This shows an aluminum conductor connecting tube that connects the conductor ends of the OF cable, and threads 16 and 16' are carved on the outer periphery of the annular protrusion formed on the outer periphery of the central part of the conductor connecting tube. A pair of ring-shaped members 17 and 17' made of brass are fitted and fixed by a method such as screw-fitting or shrink-fitting.

A pair of brass tightening nuts 18, 18' each having a threaded groove on the inner periphery are screwed onto the brass circular members 17, 17'. , 18', the conductor connecting pipe 15
The shield electrode 20 is electrically and mechanically connected to a convex ring on the inner circumference of the shield electrode 20 whose cylindrical portion is embedded in an oil stopper unit 19 made of thermosetting resin.

In the embodiment configured as described above, the conductor connection tube 15 and the shield electrode 2 are made of aluminum.
A pair of brass tightening nuts 1 to tighten and connect 0.
8 and 18' are screwed onto the brass annular members 17 and 17' fixed on the conductor connection tube 15, so that the aluminum constituting the conductor connection tube 15 is not powdered as in the conventional case. This scraping does not float inside the oil stop joint, and therefore the electrical characteristics do not deteriorate.

[Effect of the invention] As is clear from the above description, the OF of the invention is
The cable oil stop joint has superior electrical characteristics and is easier to manufacture than conventional ones.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an example of a conventional oil stopper connection for an OF cable, and FIG. 2 is a vertical cross-sectional view showing an enlarged main part of an embodiment of the present invention. 1, 1'...OF cable, 3, 15...Aluminum conductor connection tube, 4, 4'...Tightening nut,
5, 20... Shield electrode, 6, 19... Oil stopper unit made of thermosetting resin, 7... Wound layer of oil-impregnated insulating paper, 11, 11'... Electric field relaxation means, 13...
Connection case, 17, 17'...Annular member made of brass, 18, 18'...Tightening nut made of brass.

Claims (1)

[Scope of utility model registration request] The conductor ends of the OF cables on both sides to be connected are connected by a conductor connecting tube, and a pair of tightening nuts, which are harder than the conductor connecting tube, are attached to the outside of the conductor connecting tube, which is made of thermosetting resin. An oil stopper is constructed by connecting the exposed ends of the shield electrodes embedded in the oil stopper unit, providing electric field mitigation means on the insulating layer at the ends of the OF cables on both sides, and surrounding the entirety with a connecting part case. At the connection part, a pair of brass annular members made of a harder material than the conductor connection tube and having threads carved on the outer periphery are fixed to the outer periphery of both sides of the aluminum conductor connection tube. An oil stopper connection for an OF cable, characterized in that brass tightening nuts are screwed into the threads of the brass annular member.