JPH02201821A - Manufacture of cable for high voltage electric appliance - Google Patents

Abstract

PURPOSE:To manufacture the present device usable for Roentgen unit of a circuit voltage of more than 200kV by forming an inner semiconductor layer, a high voltage insulation layer, an external shielding layer, and a protective layer in order on the outer circumference of a tension line of a diameter a little larger than the outer diameter of a core part of a low voltage line to obtain a half-completed product, cutting the half-completed product for every predetermined length, pulling the tension line, and inserting the core part of the low voltage line at a center hole. CONSTITUTION:A tension line 13 consisting of a solid rod of metal, etc., of a diameter a little larger than the outer diameter of a core part 12 of a low voltage line is prepared, and an inner semiconductor layer 14, a high voltage insulation layer 15, an external shielding layer 10, and a protective layer 11 are formed in this order on the outer circumference of this line 13 to obtain a half-completed product 16 of a cable for a high voltage electric appliance. The half-completed product 16 is then cut in a length of about 5mm, for example, and the tension line 13 existing at the center is removed from this half-completed and cut cable 16 to obtain a half-completed product 16'. A preliminarily manufactured core part 12 of a low voltage line is then inserted into a space 17 formed at the center of this half-completed product 16', thereby a cable 18 for a high voltage electric appliance is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a cable for high voltage electronic equipment which is useful when manufacturing a cable for high voltage electronic equipment which can be used, for example, in an X-ray machine with a circuit voltage exceeding 200 kV. Concerning the manufacturing method.

(Technical background of the invention and its problems) Conventionally, as shown in FIG. 4 and a semiconductive wire core 6 formed with a semiconductive rubber coating 5 formed thereon, and these twisted bodies 7 are covered with a semiconductive rubber layer 8. It is called ``Department''. ), on which a high-voltage insulating layer 9 made of an insulating rubber material, an external barrier layer 10, and a protective layer 11 such as a vinyl sheath are formed in sequence.

By the way, in such an X-ray cable, since the high-voltage insulating layer 9 is formed of a rubber material, the DC breakdown level is low (75 kV/IWm in a short time). At present, it has the disadvantage that it can only be used in X-ray equipment with a circuit voltage of up to about 200 kV.

On the other hand, in the case of a cable for an X-ray device exceeding 200 kV, the high voltage insulation layer must be formed by extrusion coating of polyethylene to increase the insulation thickness.

However, if the high-voltage insulation layer is formed in-depth by extrusion coating of polyethylene.

Since the permissible tension of the low-voltage wire core is small and it is not possible to apply an appropriate tension to it, the high-voltage insulating layer must be applied in multiple extrusion coats.

However, when the high-voltage insulating layer is divided into a plurality of parts and extruded and coated, there is a problem in that foreign matter adheres to the glabella of the insulating layer, which in turn deteriorates the insulation performance of the high-voltage insulating layer.

(Objective of the Invention) The present invention has been made with attention to these points, and it is an object of the present invention to provide a method for manufacturing a cable for high-voltage electronic equipment that can be used for X-ray equipment with a circuit voltage exceeding 200 kV. be.

(Summary of the Invention) In the present invention, the above object is achieved by manufacturing a cable for high voltage electronic equipment through the following steps.

(1) Process of obtaining a semi-finished product by sequentially forming an internal semiconductor layer, a high-voltage insulating layer, an external barrier layer, and a protective layer on the outer periphery of a tensile wire with a diameter slightly larger than the outer diameter of the low-voltage wire core (2) Semi-finished product (3) Step of extracting the tensile wire from the semi-finished product without cutting it into short lengths (4) Insert the pre-manufactured low-voltage wire core into the center hole of the semi-finished product created after step (3). The process of inserting parts.

(Embodiment of the Invention) The present invention will be described below based on the drawings of one embodiment. In FIG. 2, in which the same parts as in FIG.
The low-voltage wire core 12 is manufactured in advance by twisting the wires together as shown in the figure and covering the twisted body with a semiconductive rubber layer 8.

Next, as shown in FIG. An internal semiconductor layer 14 is formed around the outer periphery of the wire 13. High voltage insulation layer 15 made of plastic material such as polyethylene. External barrier layer 10 and protective layer 11
are sequentially formed to obtain a so-called semi-finished product 16 of a cable for high voltage electronic equipment. Note that it is preferable that a large number of small-diameter conductive wires (not shown) are tightly wound horizontally around the outer periphery of the tensile wire 13, and an internal semiconductor layer is provided on this outer periphery.

In this case, since a large number of small-diameter conductors can also be used as conductors of the low-voltage core, the low-voltage core 12 described above
The conductor 4-14- can be omitted.

Then, this semi-finished product 16 is cut into lengths of, for example, about 5 m, and the tensile wire 13 present in the center is extracted from the cut semi-finished product 16- of the cable for high voltage electronic equipment, as shown in FIG. Obtain 16゛ semi-finished products. Note that if a large number of small-diameter conducting wires (not shown) are wound horizontally around the outer periphery of the tensile wire 13, the tensile wire 13 can be pulled out even more easily.

Next, a space 1 is formed at the center of this semi-finished product 16゛.
A pre-manufactured low-voltage wire core 12 (see FIG. 2) is inserted into the cable 7, thereby obtaining a high-voltage electronic equipment cable 18 as shown in FIG.

In the figure, G indicates a gap.

In the method for manufacturing cables for high-voltage electronic devices with such a configuration, there is no need to extrude the high-voltage insulating layer in multiple steps, that is, the high-voltage insulating layer can be manufactured in one step, so that foreign matter may not be present in the high-voltage insulating layer. This reduces the risk of contamination, and as a result, the insulation performance of the high-voltage insulation layer can be greatly improved. Furthermore, in the present invention, since the low-voltage wire core and the high-voltage insulating layer are separated, the termination of the cable for high-voltage electronic equipment can be easily processed.

Although the above-mentioned embodiment describes the case where polyethylene is used as the material for forming the high-voltage insulating layer, the present invention is not limited thereto. Good too.

(Effects) As described above, in the present invention, it is possible to manufacture a cable for high-voltage electronic equipment with excellent insulation performance. Cable can be provided.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a high-voltage electronic device cable manufactured according to the present invention, FIG. 2 is a cross-sectional view showing a low-voltage wire core of the high-voltage electronic device cable used in the present invention, and FIG. 4 and 4 are cross-sectional views of a semi-finished product of a cable for high-voltage electronic equipment, and FIG. 5 is a cross-sectional view of a conventional cable for high-voltage electronic equipment. 1.4...Conductor 2...Rubber insulated wire core 3...
・・・・・・・・・・・・Engraving of low voltage insulated wire core drawings (
(No change in content) Fig. 1 Fig. 2 Fig. 4 - Conductor 5...
・・・・・・・・・・・・Semi-conductive rubber coating 6...
・・・・・・・・・・・・・・・Semiconducting wire core 7...
・・・・・・・・・・・・Twisted wood 8...
...... Semi-conductive rubber layer 9.1
5...High voltage insulating layer 10...
・・・・・・External layer 11・・・・・・・・・
・・・・・・Protective layer 12・・・・・・・・・・・・・・・
・Low voltage wire core 13・・・・・・・・・・・・・・・Tensile wire 14・・・・・・・・・・・・・・・Inner semiconductor layer 16
．． 16-...Engraving of semi-finished product drawings (no change in content) λ Figure 3 Figure 4 Completion diagram Display of the incident 1999 Patent Application No. 21109 Name of the invention Correcting the manufacturing method of cables for high-voltage electronic equipment Relationship with the case Patent applicant: 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City (225) Showa Electric Wire and Cable Co., Ltd. Representative: Yoshiyuki Matsui, Osamu Sukeyo
2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City. Figures 1 to 4 of the drawings subject to the amendment. Contents of the amendments Same as the engraving of the drawings originally attached to the application (no changes to the content).・More on the attached sheet

Claims (1)

[Claims] A method for manufacturing a cable for high-voltage electronic equipment comprising the following steps. (1) A process of obtaining a semi-finished product by sequentially forming an internal semiconductor layer, a high-voltage insulating layer, an external flexible layer, and a protective layer on the outer periphery of a tensile wire with a diameter slightly larger than the outer diameter of the low-voltage wire core (2) Step of cutting the semi-finished product into required lengths (3) Step of extracting the tensile wire from the semi-finished product cut into short lengths (4) Insert the pre-manufactured low-voltage wire core into the center hole of the semi-finished product created after step (3). The process of inserting parts.