JPS589463Y2 - Extraction structure of polyethylene sheathed cable from metal casing - Google Patents

Description

[Detailed description of the invention] This invention relates to a structure for pulling out a polyethylene-sheathed cable from a metal casing. Covered cable (hereinafter referred to as P and E).

The present invention aims to provide a pull-out structure with improved airtightness and mechanical strength when pulling out cables (abbreviated as "cables") from metal casings of equipment.

Conventionally, when this type of cable is pulled out from a metal casing, a pull-out part is required to have good airtightness and high mechanical strength.

In response to such demands, conventionally, as shown in FIG. 1, the cable outlet 2a of the metal casing 2 is covered with polyethylene 3 by a method such as injection molding so as to surround the cable outlet 2a.
Generally, the PE cable 1 is pulled out from the outlet 2a, and the polyethylene 3 near the outside of the outlet 2a and the polyethylene of the outer sheath of the PE cable 1 are welded with another polyethylene 4 to maintain airtightness.

However, in the manufacturing process and facility construction of transmission equipment, the PE cable 1 is often bent near the cable outlet 2a of the metal casing 2, so the structure as shown in FIG.
Bending stress is applied to the PE cable 1, and as a result, stress is also concentrated on the polyethylene 4, which may cause cracks in the polyethylene 4 and impair airtightness.

The present invention aims to provide a drawer structure that has good mechanical strength without compromising airtightness and is easy to manufacture.

The structure of the present invention for pulling out a polyethylene-sheathed cable from a metal casing involves wrapping multiple layers of self-fusing tape around the portion of the polyethylene-sheathed cable that corresponds to the pull-out part, and installing a metal pipe around the outer periphery of this fusing tape. The metal pipe is fitted and crimped in the circumferential direction at a plurality of places, and a resin is filled and solidified around the metal pipe in the outlet of the metal casing.

Examples of the present invention will be described below.

Fig. 2 shows an embodiment of the present invention, in which 1 is a PE cable, 2 is a metal casing, and 5 is a self-adhesive tape, for example, composed of chloropyrene rubber and an adhesive layer. 6 is a metal pipe made of aluminum or the like, 7 is a resin such as epoxy or urethane, and 8 is a resin leakage prevention plate.

These are connected to the PE cable 1 before being inserted into the outlet 2a.
After winding the self-fusing tape 5 in multiple layers so that there are no gaps, a metal vibro is fitted around the outer periphery and crimped at multiple points in the circumferential direction from the outside so that pressure bonding force also acts on the PE cable 1. and attach it to tape 5.

Thereafter, the PE cable 1 is fitted with a resin leakage prevention plate 8 and inserted into the cable outlet 2a, and a molten resin 7 such as epoxy or urethane is poured into the outlet 2a and fixed to form a lead-out portion.

The reason why the self-fusing tape 5 is wound in multiple layers is that it is difficult to directly weld the outer covering polyethylene of the PE cable 1 and the filling resin, and it is difficult to fix the PE cable 1 with the resin 7. Furthermore, to attach the metal vibro, the PE cable 1, tape 5, and metal vibro are integrated by crimping the metal vibro to the tape 5, and the PE cable 1 is fixed in the solidified resin 7, mechanically. This is to improve strength.

As a result, not only the airtightness at the outlet 2a is improved, but also the mechanical strength is sufficient to withstand the bending stress applied to the cable 1 at the cable outlet.

As described above, the present invention is a polyethylene-sheathed cable that has highly reliable airtightness and sufficient mechanical strength to withstand bending forces generated near the cable outlet during the manufacturing process of various transmission equipment or facility construction. structure is obtained.

[Brief explanation of drawings]

FIG. 1 shows a conventional PE cable pull-out structure in cross-section, and FIG. 2 shows a pull-out structure according to the present invention in cross-section. In the figure, 1 is a PE cable, 2 is a metal casing, 5 is a self-fusion tape, 6 is a metal pipe, 7 is a resin, and 8 is a resin leakage prevention plate.

Claims (1)

[Scope of utility model registration request] A multilayer self-adhesive tape is wound around the outer circumference of a polyethylene sheathed cable to be inserted into the outlet of the metal casing, and metal pipes are fitted around the outer circumference of the tape and crimped in the circumferential direction at multiple points. A structure for drawing out a polyethylene-sheathed cable from a metal casing, characterized in that the metal pipe is inserted into an outlet, and a resin is filled and solidified around the metal pipe in the outlet.