CN210467364U - Coaxial flexible cable of pulse in twinkling of an eye - Google Patents

Abstract

The utility model discloses an instantaneous pulse coaxial flexible cable, which comprises a central conductor, an inner semi-conductive wrapping tape, a shielding insulation protective layer, an isolation wrapping tape, a concentric conductor, an outer semi-conductive wrapping tape and an outer sheath, wherein the central conductor, the inner semi-conductive wrapping tape, the shielding insulation protective layer, the isolation wrapping tape, the concentric conductor, the outer semi-conductive wrapping tape and the outer sheath are arranged from; the central conductor mainly comprises a plurality of strands twisted by a regular twisting process, and each strand of the central conductor is a wire bundle which is made of at least seven annealed soft copper or soft silver monofilaments with the same cross section in a bundle twisting and twisting mode; the concentric conductor mainly comprises at least eighteen strands twisted by a regular twisting process, and each strand of the concentric conductor is a wire bundle which is made of at least five annealed soft copper or soft silver monofilaments with the same cross section in a bundle twisting mode. The flexible bending performance and the bending resistance are higher, the transmission of large current and high voltage is avoided, and when the cable is bent, the relative movement between the bent strands of the cable ensures the electric field distribution on the surfaces of the central conductor and the concentric conductor to be balanced, and the safety performance is improved.

Description

Coaxial flexible cable of pulse in twinkling of an eye

Technical Field

The utility model relates to an instantaneous pulse coaxial flexible cable, which is mainly applied to the high technical field of ultra-large electric energy instantaneous pulse excitation fusion, in particular to instantaneous pulse 'megaampere' current; the use of "super high" voltage transmission.

Background

In the high technical field of ultra-large electric energy transient pulse excitation fusion, the requirements on a coaxial cable carrier for electric energy transmission are very strict, and the cable has the characteristics of high flexibility, high current (megaampere), high voltage, low loop resistance and the like. The conventional instantaneous pulse coaxial cable has the following disadvantages:

1. in a traditional instantaneous pulse coaxial cable, materials of all layers of the cable are coaxially arranged from inside to outside, and the cable is composed of an inner conductor, an inner insulating layer, an outer conductor and an outer insulating protective layer. The inner conductor layer is generally formed by a single copper wire or a plurality of copper wires, and the outer conductor is formed by weaving single copper wires in a single layer or multiple layers. The cable with the structure has larger outer diameter, larger reciprocating resistance of the conductor and larger integral bending radius of the cable, and poor flexibility, bending resistance and bending resistance;

2. traditional pulse coaxial cable in twinkling of an eye is transmitting heavy current, high voltage to when the cable is crooked, lead to inside and outside conductor surface electric field intensity distribution inhomogeneous, the phenomenon of discharging appears in the cable, has the risk that the cable is punctured even, thereby has reduced life.

Disclosure of Invention

The utility model aims to provide a: aiming at the defects of the prior art, the flexible cable is flexible and has higher bending performance, avoids the transmission of large current and high voltage, ensures the electric field distribution balance on the surfaces of the central conductor and the concentric conductor by the relative movement between the bent strands of the cable when the cable is bent, and improves the safety performance.

The technical scheme adopted by the utility model is that the coaxial flexible cable for the instantaneous pulse comprises a central conductor, an inner semi-conductive wrapping tape, a shielding insulation protective layer, an isolation wrapping tape, a concentric conductor, an outer semi-conductive wrapping tape and an outer sheath which are arranged from inside to outside; the central conductor mainly comprises a plurality of strands twisted by a regular twisting process, and each strand of the central conductor is made of at least seven annealed soft copper or soft silver monofilaments with the same cross section in a bundle twisting manner; the concentric conductor is mainly composed of at least eighteen strands twisted by a regular twisting process, and each strand of the concentric conductor is made of at least five annealed soft copper or soft silver monofilaments with the same cross section in a bundle twisting mode.

The inner semi-conductive wrapping tape is a semi-conductive wrapping tape, is uniformly wound on the outer peripheral wall of the central conductor in a tightly surrounding mode, and tightens all the strands of the central conductor, so that the electric field distribution on the surface of the central conductor is balanced.

The shielding insulation protective layer is formed by co-injection molding and extrusion of the conductor shield, the insulation layer and the insulation shield. Furthermore, the thickness ratio of the conductor shield to the insulation is (6-8): 1.

The isolation belting is polyethylene or polypropylene which plays a role in interlayer separation.

The outer semi-conductive wrapping tape is a semi-conductive wrapping tape, is uniformly wound on the outer peripheral wall of the concentric conductor in a tightly surrounding mode, and tightens all the strands of the concentric conductor, so that the electric field distribution on the surface of the concentric conductor is balanced.

The outer sheath is formed by rubber plastic in an extrusion molding mode.

The utility model has the advantages that:

1. the utility model discloses an aspect adopts seven at least cross sections the same, the soft copper of annealing or soft silver monofilament to make the single strand yarn with the mode of bundle transposition, and the central conductor who makes many strands is twisted with regular transposition technology again. Meanwhile, at least five annealed soft copper or soft silver monofilaments with the same cross section are adopted to be made into a single strand in a bundle twisting mode, and then the single strand is twisted by a regular twisting process to be made into a concentric conductor with at least eighteen strands. Therefore, the reciprocating resistance (loop resistance) during operation is smaller, and compared with a single sparse winding and/or weaving structure in the traditional similar cable, the flexibility and bending performance of the cable are greatly improved. Moreover, under the condition of repeated bending under the same condition, the utility model has higher bending resistance and longer service life; on the other hand, the inner semi-conductive wrapping belt and the outer semi-conductive wrapping belt are adopted to respectively and correspondingly wind the central conductor and the concentric conductor, so that the relative movement between the bent strands of the cable is avoided when large current and high voltage are transmitted and the cable is bent, the electric field distribution on the surfaces of the central conductor and the concentric conductor is ensured to be balanced, and the safety performance is improved.

2. The utility model discloses in, look on the whole, for like product, under the same condition in effective cross-section, the utility model discloses pulse current (DC) in the twinkling of an eye that can bear is about 1.5 times of ordinary like product, and withstand voltage ability is about 2.5 times of ordinary like finished product.

Drawings

The present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a front view of a radial cross-sectional structure.

Fig. 3 is a top view of an axial structure.

The reference numbers in the figures mean: 1 — a center conductor; 2-inner semi-conductive tape; 3-shielding an insulating protective layer; 31-a conductor shield; 32-an insulating layer; 33-insulating shielding; 4, isolating a belting; 5-a concentric conductor; 6-outer semiconductive tape; 7-outer sheath.

Detailed Description

Referring to fig. 1 to 3: the utility model relates to a coaxial flexible cable of pulse in twinkling of an eye, coaxial flexible cable includes central conductor 1, interior semiconduction band 2, shielding insulation inoxidizing coating 3, isolation band 4, concentric conductor 5, outer semiconduction band 6 and oversheath 7 that from interior to exterior set up. On the whole, compared with like products, under the condition that the effective sections are the same, the instant pulse current (DC) which can be borne by the novel high-voltage direct current (HVDC) power supply is about 1.5 times that of common like products, and the voltage resistance is about 2.5 times that of common like products.

The central conductor 1 mainly comprises a plurality of strands twisted by a regular twisting process, and each strand of the central conductor 1 is made of at least seven annealed soft copper or soft silver monofilaments with the same cross section in a bundle twisting manner; the concentric conductor 5 is mainly composed of at least eighteen strands twisted by a regular twisting process, and each strand of the concentric conductor 5 is made of at least five annealed soft copper or soft silver monofilaments with the same cross section in a bundle twisting manner.

Specifically, on one hand, at least seven annealed soft copper or soft silver monofilaments with the same cross section are adopted to be made into a single strand in a bundle twisting mode, and then the single strand is twisted into a central conductor 1 of a plurality of strands in a regular twisting process. Meanwhile, at least five annealed soft copper or soft silver monofilaments with the same cross section are adopted to be made into a single strand in a bundle twisting mode, and then the single strand is twisted by a regular twisting process to be made into at least eighteen concentric conductors 5 of the strand. The structural design can make the reciprocating resistance (loop resistance) of the cable during operation smaller and improve the current-carrying capacity. Compared with a single sparse winding and/or weaving structure in the traditional similar cable, the flexibility and bending performance of the cable are greatly improved. Moreover, under the condition of repeated bending under the same condition, the steel plate has higher bending resistance and longer service life;

on the other hand, the inner semi-conductive wrapping belt (2) and the outer semi-conductive wrapping belt (6) are respectively and correspondingly wound on the central conductor 1 and the concentric conductor 5, so that the relative movement between bent strands of the cable is avoided when large current and high voltage are transmitted and the cable is bent, the electric field distribution on the surfaces of the central conductor 1 and the concentric conductor 5 is ensured to be balanced, and the safety performance is improved.

The inner semi-conductive wrapping tape 2 is a semi-conductive wrapping tape, is uniformly wound on the outer peripheral wall of the central conductor 1 in a tightly surrounding mode, and tightens all the strands of the central conductor 1, so that the electric field distribution on the surface of the central conductor 1 is balanced. The relative movement between the strands of the central conductor 1 when the cable is bent is avoided, and meanwhile, the damage to the shielding insulation protection layer 3 (specifically, the conductor shield 31 in the shielding insulation protection layer 3) caused by the relative movement is avoided.

Preferably, the shielding insulation protection layer 3 is formed by co-injection molding and extrusion of the conductor shield 31, the insulation layer 32 (cross-linked polyethylene) and the insulation shield 32. More preferably, the thickness ratio of the conductor shield 31 to the insulating layer 32 is (6-8): 1. The utility model discloses a shielding insulation inoxidizing coating 3 also can adopt current ripe, one or more other materials to replace, can guarantee the utility model discloses a shielding, insulating properties require can.

For the convenience of processing requirements in the flexible cable, the insulation tape 4 is polyethylene or polypropylene which plays a role of interlayer separation.

The outer semi-conductive wrapping tape 6 is a semi-conductive wrapping tape, is uniformly wound on the outer peripheral wall of the concentric conductor 5 in a tightly surrounding manner, and tightens all the strands of the concentric conductor 5, so that the electric field distribution on the surface of the concentric conductor 5 is balanced. Relative movement between the strands of the concentric conductor 5 during bending of the cable is avoided and damage to the dielectric shield 32 caused by such relative movement is avoided.

The outer sheath 7 is formed by rubber plastic extrusion molding. Specifically, a layer of rubber plastic is extruded by the existing mature extrusion molding equipment to be used as the outer sheath 7 of the whole flexible cable.

In addition, according to actual inspection, data contrast can know, the utility model discloses a bend radius is about 6 times cable external diameter, and the bend radius of the ordinary cable of the same kind is about 12 times cable external diameter. And the smaller the bending radius is, the better the bending resistance is, thereby knowing that the utility model discloses a bending resistance is superior to current ordinary cable of the same kind far away.

The above detailed description is only for the purpose of illustration, but not for the purpose of limitation. Although the present invention has been described in detail with reference to the specific embodiments thereof, it will be understood by those skilled in the art that: the above-mentioned specific technical solutions can still be modified, or some technical features thereof can be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the present invention in its essence.

Claims (7)

1. An instantaneous pulse coaxial flexible cable is characterized in that: the coaxial flexible cable comprises a central conductor, an inner semi-conductive wrapping tape, a shielding insulation protective layer, an isolation wrapping tape, a concentric conductor, an outer semi-conductive wrapping tape and an outer sheath which are arranged from inside to outside; the central conductor mainly comprises a plurality of strands twisted by a regular twisting process, and each strand of the central conductor is made of at least seven annealed soft copper or soft silver monofilaments with the same cross section in a bundle twisting manner; the concentric conductor is mainly composed of at least eighteen strands twisted by a regular twisting process, and each strand of the concentric conductor is made of at least five annealed soft copper or soft silver monofilaments with the same cross section in a bundle twisting mode.

2. The transient impulse coaxial flexible cable of claim 1, wherein: the inner semi-conductive wrapping tape is a semi-conductive wrapping tape, is uniformly wound on the outer peripheral wall of the central conductor in a tightly surrounding mode, and tightens all the strands of the central conductor, so that the electric field distribution on the surface of the central conductor is balanced.

3. The transient impulse coaxial flexible cable of claim 1, wherein: the shielding insulation protective layer is formed by co-injection molding and extrusion of the conductor shield, the insulation layer and the insulation shield.

4. The transient impulse coaxial flexible cable of claim 3, wherein: the thickness ratio of the conductor shield to the insulation is (6-8): 1.

5. The transient impulse coaxial flexible cable of claim 1, wherein: the isolation belting is polyethylene or polypropylene which plays a role in interlayer separation.

6. The transient impulse coaxial flexible cable of claim 1, wherein: the outer semi-conductive wrapping tape is a semi-conductive wrapping tape, is uniformly wound on the outer peripheral wall of the concentric conductor in a tightly surrounding mode, and tightens all the strands of the concentric conductor, so that the electric field distribution on the surface of the concentric conductor is balanced.

7. The transient impulse coaxial flexible cable of claim 1, wherein: the outer sheath is formed by rubber plastic in an extrusion molding mode.

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