JPS5939794Y2 - Cable terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved termination of a high voltage cable.

For example, the terminal part of a high-voltage cable for X-rays is insulated by sequentially stripping off the high-voltage core 2, main insulator 3, semiconducting layer 4, metal braided shielding layer 5, and sheath 6 of the cable 1 as shown in Figure 1. An insulating reinforcement body 7 made of a resin material is placed around the circumference of the body 3.
Further, a bellmouth-shaped conductive cylinder 8 is provided at the lower part of the reinforcing body 7 to alleviate the electric field and is electrically connected to the shielding layer 5 by a metal wire 9. In this structure, the shielding layer 5 and the cylindrical body 8 are connected by a metal wire 9
It must be made to protrude beyond the sheath 6 as the shielding layer 5 in order to connect electrically and mechanically by zero winding.
Therefore, the portion of the protruding shielding layer 5 where there is no sheath 6 for mechanical protection around it may be damaged by the bending force or twisting force applied to the cable. As a result of the protruding length, the length of the terminal portion increases accordingly.

The present invention was made with the aim of providing a cable terminal part that is structurally stable and shorter than conventional cables. An insulating reinforcing body is formed around the insulator by exposing an appropriate length of the body, and a bellmouth-shaped conductive cylinder is formed below the reinforcing body, and the cylinder has a small diameter portion extending from the sheath end. The present invention relates to a cable terminal portion that is inserted inside or outside the shielding layer.

As the metal shielding layer, metal tape or metal braided tape wrapping or metal braiding can be considered, but in general, when the shielding layer is composed of metal tape wrapping, it is difficult to stretch the metal tape, so it is difficult to The small diameter portion of the mouse-shaped conductive cylinder is usually inserted outside the shielding layer and inside an elastic sheath, often made of rubber or plastic.

Further, when the shielding layer is composed of metal wires wrapped around a metal braided tape, it is more advantageous to insert the small diameter portion of the bellmouth-shaped conductive cylinder inside the shielding layer rather than outside.

In other words, since the shielding layer, which is stretchable due to its braiding, is expanded by inserting the small diameter part of the hard bellmouth-shaped conductive cylinder made of metal in most cases, the elastic tightening force from the shielding layer is increased. This acts on the small diameter portion of the conductive cylinder, and therefore good electrical contact between the small diameter portion of the conductive cylinder and the shielding layer is maintained.

When doing this, the sheath, which is often made of rubber or plastic and which is expanded by inserting the small diameter part of the conductive cylinder, also applies its elastic clamping force to the small diameter part of the hard conductive cylinder. This acts on the shielding layer, and from this point of view as well, the electrical contact between the small diameter portion of the conductive cylinder and the shielding layer becomes more stable.

Next, an embodiment of the cable terminal part of the present invention will be described with reference to FIG. 2. Reference numeral 11 indicates a high voltage wire core 12, a main insulator 13 made of rubber or plastic, a semiconducting layer 14, and a metal braided shielding layer 1.
5 and a rubber or plastic sheath 16, the wire core 12 and insulator 13 are exposed for appropriate lengths.

17 is the wire core 12 and the insulator 13 leaving a part of the wire core 12
Insulating reinforcement made of epoxy resin etc. formed on top,
Reference numeral 18 denotes a bellmouth-shaped conductive cylinder formed at the lower part of the reinforcing body 17, and its small diameter portion 18' is inserted into the inside of the shielding layer 15 from the sheath end, thereby electrically connecting the shielding layer 15. has been done.

When inserting and positioning the small diameter portion 18' inside the shielding layer 15, when a blade-shaped portion is formed at the tip of the small diameter portion 18' as in this embodiment, the insertion position is lower than that of the case where the small diameter portion 18' is not inserted. becomes easier.

Also, for example, when the metal braided shielding layer 15 is made to protrude somewhat beyond the sheath 16 and the protruding portion is rolled up over the end of the sheath 16, the small diameter portion 18 is placed on the inside of the shielding layer 15.
′ is easier to insert.

In this case, the cutout 1 may be left inside the shielding layer 15, or it may be removed after the small diameter portion 18' is inserted.

According to the cable terminal section of this embodiment, which is constructed in a specific manner, the small diameter portion 18' of the bellmouth-shaped conductive cylinder 18 is connected to the sheath 1.
The conventional terminal shown in FIG. 1 is different from the conventional terminal shown in FIG. There is no mechanical weak point such as the part of the protruding shielding layer 5 where the sheath 6 is missing as shown in the figure, and therefore damage caused by bending or twisting force applied to the cable is prevented. Furthermore, in this way, the small diameter portion 18' of the conductive cylinder 18 can be connected to the shielding layer 15 from the end of the sheath 16.
As a result of inserting the shielding layer into the inside of the sheath and electrically connecting the two, there is no longer a need for the shielding layer to protrude a predetermined length from the sheath end as in the past, and the length of the terminal part is therefore shorter than that of the conventional one. becomes possible.

As described above, the present invention provides a cable terminal portion that is structurally stable and shorter than the conventional cable terminal, and its industrial value is extremely high.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional cable terminal section, and FIG. 2 is an explanatory diagram of an embodiment of the cable terminal section of the present invention. 11: cable, 13: insulator, 14: semiconducting layer, 15
: Metal shielding layer, 16: Sheath, 17: Insulating reinforcement, 18
: Bellmouth-shaped conductive cylinder, 18': Small diameter part.

Claims (1)

[Scope of utility model registration request] A suitable length of the insulator of the cable is formed by sequentially forming a semiconducting layer, a metal shielding layer, and a sheath on an insulated conductor, and an insulation reinforcement is formed around the insulator, and a lower part of the reinforcement is formed. 1. A cable terminal portion comprising: a bellmouth-shaped conductive cylinder, the cylinder having a small diameter portion inserted into the inside or outside of the shielding layer from the sheath end.