JPS5922775Y2 - OF cable oil stop connection - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil-stop connection portion of an oil-filled cable (OF cable).

The oil stop connection of the OF cable, in particular the oil stop connection using a stop unit made of epoxy resin, is constructed in a conventional manner.

That is, as shown in FIG. 1, a conductor connection is made to connect the conductors of both cables 3 and 4 to be connected to a ring-shaped shielding fitting 2 provided approximately at the center in the axial direction of the inner circumference of the epoxy resin stop unit 1. The conductor connection fitting 5 is engaged with the metal fitting 5, an O-ring 6 is interposed between the outer circumference of the flange 5a provided at one end of the conductor connection fitting 5 and the inner circumference of the shielding metal fitting 2, and a ring nut 7 is screwed onto the inner circumference of the shielding metal fitting 2. is fixed to the shielding fitting 2.

In the above configuration, since the ring nut 7 is located deep inside the shielding metal fitting 2, a specially shaped tool is required to tighten it, and the tightening must be done manually. Moreover, it was impossible to tighten the stop unit 1 and the conductor connection fitting 5 while visually checking their relative positions.

As a solution to the above problems,
The devices disclosed in No. 6344 and Utility Model Publication No. 12916/1987 were proposed, but the former device has a conductor connecting fitting divided into parts, which are connected by bolts, and a shielding fitting having a two-part structure on the outer periphery. Since it is necessary to provide a connector, the structure becomes complicated and the overall length of the connection part becomes longer.

In addition, the latter design does not use a ring nut and has a structure in which the conductor connection fitting is directly screwed onto the stop unit, so there is a risk that the O-ring may be twisted or the screwing force may be insufficient, resulting in poor oil sealing. was there.

The present invention was developed in view of the above circumstances, and does not require specially shaped tools for assembly, and it is possible to visually confirm the relative position of the conductor connection fitting and the stop unit while fixing them to each other. Moreover, to provide an OF cable oil-stop connection part that has a simple structure, can be made small in overall length, and is free from the risk of oil-tightness failure.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

In FIG. 2, a conductor connecting fitting 8 that connects the conductors of the cables 3 and 4 to be connected has a flange 8a at one end offset from the center in the axial direction, and a compression part 8b at the other end of the flange. A body portion 8C having approximately the same diameter is provided, and a circumferential groove 8d into which an O-ring 9 is mounted is provided in the body portion 8C.

Further, a screw 10 is provided at the end of the body portion 8d opposite to the flange.

On the other hand, the stopper unit 11 has a two-part structure, and one divided piece 12 has a truncated conical recess 12a that covers the bell mouth 10 attached to the sheath peeling part of one cable 3.
is provided at one end, and the other end is provided with a stepped hole on the top surface consisting of a small diameter part that engages with the body 8C of the conductor connection fitting 8 via an O-ring 9, and a large diameter part that is continuous with the small diameter part and continues with the flange 8a. It has a substantially cylindrical shielding fitting 12b.

The top end of the shielding fitting 12b has a smaller diameter than the other parts, and a screw 12b1 is carved on the outer periphery of the small diameter part.

The other divided piece 13 has a truncated conical recess 13a at one end that covers the bell mouth 15 attached to the cable 4,
The other end is provided with a cylindrical shielding fitting 13b having a female thread at the open end to be screwed into the screw 14.

Note that the shielding fittings 12b and 13b have the same outer diameter.

In the figure, 20 indicates a ring nut.

The connecting portion of the present invention having the above structure can be assembled as follows.

First, the oil-impregnated paper insulation layer 1 is placed on the exposed core part of the cable 3 on the left side.
6 is formed and the bell mouth 14 is attached, and the end of the conductor connecting fitting 8 on the 7 lange side is compressed and connected to the conductor terminal.

Here, the divided piece 12 is engaged, the stepped hole on the top surface thereof is engaged with the flange 8a and the body part 8C, and the ring nut 20 is screwed into the screw 14 at the small diameter end of the shielding fitting 12b.
The divided piece 12 is fixed to the conductor connection fitting 8.

Next, the oil-impregnated paper insulation layer 17 of the other cable 4 is formed and the bell mouth 15 is attached.

At this time, the bell mouth 15 is shifted to the side opposite to the connection end of the cable 4.

Here, the divided piece 13 is engaged with the cable 4 so that its conductor terminal protrudes from the open end of the shield fitting 13b,
The conductor and the conductor connection fitting 8 are connected by compression.

Next, shift the divided piece 13 and attach the shielding fitting 13b to the same position.
b, screw the female thread of the shielding fitting 13b onto the screw 12b1 of the shielding fitting 12b, and then remove both divided pieces 12.1.
3 are combined to form a stop unit 11.

Note that an insulating reinforcing layer 18 is provided on the outer periphery of the stop unit 11.
A connection box 19 is then placed on top of the connection box 19 and filled with oil to complete the connection.

As is clear from the above, the present invention has a two-part structure in which the plane perpendicular to the axis of the stop unit is the dividing plane, and after joining one divided piece and the conductor connection fitting, the other divided piece Since the pieces are connected by screwing the shield fitting to form a stop unit, the ring nut that connects the conductor connection fitting can be tightened without using a specially shaped tool. This can be done while visually observing the relationship, etc.

Further, since the divided pieces of the stop unit are connected by screwing together the shielding fittings, the connecting portion does not become large.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional oil stop connection, and Figure 2 is a cross-sectional view of the conventional oil stop connection.
It is a sectional view of an example. 3.4... Cable, 8... Conductor connection fitting, 8a... Flange, 11... Stop unit, 12.13... Split piece, 1
2 a, 13 a --- Conical recess, 12
b, 13 b...shielding fitting, 12b1...
...Screw, 20...Ring nut.

Claims (1)

[Scope of utility model registration request] A first divided piece of a stop unit having a conductor connecting fitting for connecting the conductor of the conjunction cable, a shielding fitting for penetrating and engaging the conductor connecting fitting in an oil-tight manner, and a first divided piece of the stop unit having a conductor connecting fitting for connecting the conductor of the conductor connecting fitting and the shielding fitting for connecting the conductor connecting fitting to the shielding fitting. A ring nut that is fixed to the
An oil stopper connection portion for an OF cable, characterized in that it has a second divided piece of a stop unit having a shielding fitting screwed into the shielding fitting at its end.