JPS6333515Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a molding machine for a mold joint of a high-voltage cross-linked polyethylene cable of, for example, 60KV class.

[Technical background of the invention]

The mold joint of a 60KV class cross-linked polyethylene cable is molded as shown in Figure 1. That is, Kapton tape is wound around the outer periphery of the joint portion 1 formed by winding uncrosslinked polyethylene tape, and this is wrapped around the heater 2.
is placed in a molding device housing 3 containing a molding device, gas pressure is applied inside the molding device, and the joint is energized by the heater 2 to mold the joint. At this time, the uncrosslinked tape is molded to form a mold joint and simultaneously crosslinked. Note that a packing 5 that is bolted is provided at the portion of the cable 4 that passes through the molding machine to seal off the gas pressure. In addition, in the part near joint 1 of cable 4,
A cooling pipe 6 for wind cooling is wrapped around the cable to prevent the cable from being affected by heat during molding.

[Problems with background technology]

In the above molding method, since the tightening force of the packing 5 is large, depressions are formed on the cable surface during molding due to the packing. Also,
It is necessary to increase the length of the molding machine by the length of the cooling pipe 6, which may reduce workability on site.

[Purpose of invention]

The present invention was developed based on the above-mentioned circumstances, and aims to provide a molding device for a mold joint that is free from deformation such as dents on the cable surface and can be constructed in a compact size.

[Summary of the idea]

In the present invention, a reinforcing tube is attached to the end face of the molding machine casing via packing, the cable is passed through the casing in this reinforcing tube, the inner end of the reinforcing tube and the cable are sealed with tape, etc., and the inside of the reinforcing tube is sealed. This objective is achieved by blowing cold air through the area.

[Example of idea]

In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals. On the 3rd end of the molder housing,
A packing seat 7 is provided, and a packing collar 8 and a packing 9 are housed in the packing seat, and a reinforcing tube 10 through which the cable 4 is inserted is
The packing 9 is pressed by the packing fastener 11 bolted to the packing seat 7, so that the packing 9 is airtightly attached to the end surface of the housing 3. The sheath of the cable 4 is peeled off inside the reinforcing tube 10 to expose the shielding tape layer 12, and the tape layer 12 is also attached to the reinforcing tube 1.
The insulating layer 13 is exposed by cutting at the middle part of 0. Furthermore, a cooling pipe 14 for supplying cold air is provided inside the reinforcing tube 10 in the axial direction of the reinforcing tube 10, and has an open end near the inner end of the reinforcing tube.

Note that a seal 15 is formed between the inner end of the reinforcing tube 10 and the cable insulation layer 13 using a tape winding layer or a heat shrink tube.

In the molding machine of the present invention having the above configuration, since the packing is not brought into direct contact with the cable 4, no dents or the like are caused by the packing during molding.

Furthermore, since the seal 15 that seals between the reinforcing tube 10 and the cable insulating layer 13 is located inside the molding machine housing 3, the force acting on the seal 15 due to the high pressure inside the molding machine housing 3 is absorbed by the seal 15. Reinforcement tube 1
0, and there is no risk that the seal 15 will fall off due to the high pressure inside the housing.

Further, since the cooling pipe 14 is provided outside the housing 3, the axial length of the molding device is reduced, and workability on site is improved.

Furthermore, since the cut end of the shielding tape is cooled by cold air, no protrusion of the insulating layer will occur at the cut end due to expansion of the insulating layer during crosslinking.

The present invention is not limited to the above embodiments. For cooling, you can use not only cold air but also a liquid that does not affect the cables.

Furthermore, in order to supply the cooling fluid into the reinforcing tube 10, it is not necessarily necessary to install the cooling pipe 14 inside the reinforcing tube 10.
The injection may be made through the opening.

[Effect of idea]

According to the present invention, since the joint is housed in the housing and gas pressure is applied to assist the joint, the crosslinking temperature can be quickly reached. Moreover, the cable is not deformed, and workability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional molding device, and FIG. 2 is a sectional view of the main parts of an embodiment of the present invention. 1... Joint, 2... Heater, 3... Molder housing, 4... Cable, 9... Packing, 10... Reinforcement tube, 14... Cooling pipe, 15
……sticker.

Claims (1)

[Scope of utility model registration request] A molding device housing that has a built-in heater and to which fluid pressure is applied, a reinforcing tube that is airtightly attached to the end surface of the molding device housing through packing and through which a cable is inserted, and A mold for a mold joint, characterized in that it has a seal that seals between an end portion and the inserted cable and is located in the molding device housing, and a cooling means that supplies cooling fluid into the reinforcing cylinder. vessel.