JPS6245473Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a termination box for a moving cable that allows for inclined mounting, horizontal mounting or downward mounting.

For example, a termination box for a rubber/plastic cable has conventionally been constructed as shown in FIG.

That is, the conductor 1 is exposed by peeling off the conductor 1.
A cable end portion 3 with a conductor pull-out rod 2 fixed to the tip thereof is inserted from below the insulator tube 4 and fixed to the upper end of the insulator tube 4 via a fixing fitting 5, and the cable end portion 3 is connected between the cable end portion 3 and the insulator tube 4. It was constructed by filling an insulating mixture 7 with a space 6 left at the top for absorbing volume changes.

Reference numeral 8 indicates a seal portion formed by winding a self-fusing tape over the cable insulator 9 and the conductor pull-out rod 2, 10 indicates a fastening fitting, and 11 indicates a cover.

However, in such conventional cable termination boxes,
When installing at an angle, if the angle of inclination exceeds 30°, the liquid level in the space 6 will dangerously approach the lower earth electrode (not shown). The problem was that it could only be installed at an inclined angle.

On the other hand, as a cable termination box for horizontal installation, one is known that is attached with an adjustment tank 12 for absorbing changes in the volume of the insulation mixture, as shown in FIG.

Note that in FIG. 2, parts common to those in FIG. 1 are indicated by the same reference numerals as in FIG. 1.

In this cable termination box, the adjustment tank 12 is installed at a position higher than the liquid level of the insulating mixture 7 in the insulator tube 4, so the insulating mixture 7 is completely filled in the insulator tube 4 at all times.

However, in such a conventional cable termination box for horizontal installation, the insulating mixture 7 must be injected after installation on the tower, which is extremely troublesome and requires additional space since the adjustment tank 12 is attached. The drawback was that its installation required a variety of considerations, including important aspects. In particular, it was difficult to apply this method to a moving cable because the adjustment tank 12 would become too crowded. In addition, 13 in the figure is a connector, 1
4 is a connecting pipe, 15 is an epoxy sleeve, and 16 is a pre-molded stress cone.

In addition, Utility Model Application Publication No. 53-22096 describes a cable connection part that uses bellows to absorb changes in the volume of an insulating mixture sealed in an insulator tube, but this cable connection part is fixed. It is impossible to assemble it in a factory, and therefore filling work with insulating mixture must be done at a high place on site. It is extremely difficult to apply this method to inclined mounting.

The present invention has been developed to solve these conventional problems, and includes a plug-in connection fitting inside the tip, a conductor pull-out rod with one end connected to the connection fitting, and a conductor pull-out rod protruding from the insulating socket. A socket is inserted from the base of the insulator tube so that the conductor pull-out rod is exposed from the tip, and both bases are fixed fluid-tightly, while the tip of the conductor pull-out rod is fixed to the tip of the insulator tube via a fixing fitting. Further, a bellows covering the conductor pull-out rod is fluid-tightly fixed to the outside of the fixing fitting, and a through hole is bored in the fixing fitting to communicate between the inside of the bellows and the inside of the insulated tube, and insulation is mixed into the inside of the bellows and the inside of the insulated tube. It is an object of the present invention to provide a termination box for a moving cable characterized by enclosing a substance therein.

The details of the embodiment shown in FIG. 3 will be explained below. In the figure, parts common to those in FIG. 1 are designated by the same reference numerals.

The embodiment shown in FIG. 3 shows an example applied to horizontal installation, and a so-called garter spring type tulip contact 21 is installed inside the tip of an insulating socket 22 made of epoxy resin into which the cable terminal part 3 is inserted. A conductor pull-out rod 2 having one end electrically connected to the tube contact 21 is protruded. This insulating socket 22 is inserted from the base of the insulating tube 4 so that the conductor pull-out rod 2 is exposed from the tip of the insulating tube 4, and the base of the insulating tube 4 and the base of the insulating socket 22 are integrally molded on the base of the insulating socket 22. flange 23
It is fixed liquid-tightly. The distal end of the conductor pull-out rod 2 is fixed to the distal end of the insulator tube 4 via a fixture 5, and a metal bellows 17 is fixed to the outside of the fixture 5 so as to cover the conductor pull-out bar 2.

Further, the fixing fitting 5 is provided with a through hole 18 that allows communication between the interior of the insulator tube 4 and the interior of the metal bellows 17. 19 is a connector for enclosing the insulating mixture 7 in the insulator tube 4, and 20 is a terminal fitting.

The cable end portion 3 is inserted into the insulating socket 22 of the termination box, and the conductor plug 24 at the tip thereof is removably fitted.

In the moving cable termination box of the present invention constructed as described above, the insulating mixture 7 is sealed in the insulating tube 4 and in the metal bellows 17 fixed to the opposite side of the insulator tube 4 of the fixing fitting 5. There is no space inside the insulator tube 4, and even if the insulator tube 4 is installed obliquely, horizontally, or downwardly, there is no fear that a space will be created in the vicinity of the earth electrode inside the insulator tube 4.

Furthermore, since the interior of the insulator tube 4 and the interior of the metal bellows 17 are communicated through the through hole 18 provided in the fixture 5, changes in the volume of the insulating mixture caused by temperature changes are absorbed by the expansion and contraction of the metal bellows 17.

In this terminal box for a moving cable, the insulator tube 4 side and the cable terminal section 3 side are configured separately in advance, and furthermore, the conductor terminal section and the pre-molded stress cone 15 are arranged on the cable terminal side at the time of factory shipment. If a night cap is fitted over these to protect them from damage and staining, assembly can be easily carried out at the time of use.

Furthermore, by keeping the insulator tube portion separate at the time of factory shipment or storage, the space factor of the winding drum can be improved and the winding drum can be made smaller.

Furthermore, since it is possible to inject the insulating mixture 7 into the insulating pipe 4 in the factory, it is possible to avoid the difficult work of heating and injecting the insulating mixture after installing it on the steel tower as in the past. can.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view showing the main parts of a conventional cable termination box, Fig. 2 is a partial sectional view showing another conventional cable termination box, and Fig. 3 is a partial sectional view showing an embodiment of the present invention. It is. 1...Conductor, 2...Conductor pull-out rod, 3...Cable end portion, 4...Insulator tube, 5...Fixing metal fitting, 7...
Insulating compound, 17... Metal bellows, 22... Insulating socket.

Claims (1)

[Scope of utility model registration request] A conductor pull-out rod having an insertion hole at the lower end and a connecting fitting that can be inserted into the insertion hole, an annular flange arranged below the conductor pull-out rod, and a conductor pull-out rod on the outer periphery of the conductor pull-out rod. an insulating socket which is provided with the tip of the rod exposed and whose lower end extends beyond the lower position of the conductor pull-out rod and is fixed to the upper surface of the flange; an insulator tube which is connected to the insulator tube and whose lower end is fixed to the upper surface of the flange; a fixing fitting attached to the top of the insulator tube by penetrating the tip of the conductor pull-out rod; a bellows fixed in a fluid-tight manner to cover the tip; a cover covering the bellows and fixing its lower end to the top of the insulating tube or the top surface of the fixing fitting; and an insulating mixture sealed in a space formed by the inner wall and the lower surface of the fixing fitting, and the inside of the bellows is communicated with the space through a through hole drilled in the fixing fitting. A cable termination box featuring: