CN211604786U - Super-soft large-current pulse power cable - Google Patents

Abstract

The utility model relates to the technical field of electric wires and cables, in particular to an ultra-flexible large-current pulse power electric cable which comprises an inner conductor, the inner conductor is wrapped with an inner conductor wrapping shielding layer, an inner conductor semi-conductive shielding layer, an inner insulation layer and an inner insulation shielding layer are sequentially arranged outside the inner conductor wrapping shielding layer, an outer conductor is arranged outside the inner insulating shielding layer, the outer conductor comprises a single-layer metal-plated twisted copper strand equidirectional tight winding layer and a single-layer metal-plated copper wire braided layer, the single-layer metal-plated stranded copper strand equidirectional tight winding layer is wound outside the inner insulation shielding layer, the single-layer metal-plated copper wire weaving layer is coated on the single-layer metal-plated stranded copper strand equidirectional tight winding layer, the outer conductor is wrapped with an outer conductor wrapping shielding layer, an outer insulator wraps the outer conductor wrapping shielding layer in an extruding mode, and a sheath wraps the outer insulator in an extruding mode. The utility model discloses an optimize cable construction, satisfied the various requirements that the pulse power system provided.

Description

Super-soft large-current pulse power cable

Technical Field

The utility model relates to a wire and cable technical field, concretely relates to super gentle heavy current pulse power cable.

Background

The pulse power technology is a new special power technology, can realize energy compression and power amplification through long-term storage and instantaneous release, provides high-capacity, high-voltage, high-current and high-density electric energy, and is widely applied to the fields of electromagnetic emission, strong magnetic pulse, nuclear fusion and the like. The pulse power system is usually in a modular design, consists of a plurality of pulse power units, has the characteristics of small space, large-angle rotation and pitching operation, has huge instantaneous power, a matched connecting cable between the load and the energy storage module needs to bear a high-voltage environment and be bent at a high degree, and the instantaneous bearing current of a single cable reaches tens of thousands to hundreds of thousands of amperes. If design according to general direct current cable standard, the conductor cross-section will have tens of thousands square millimeters, leads to that the cable external diameter is big, weight is heavy, bending property is poor, and stray current between the conductor causes the electric corrosion easily simultaneously, influences and equips the life-span, can't realize pulse system engineering application. Therefore, for the power cable for the pulse power system, the innovative cable structure, the high-temperature soft material, the working temperature improvement, the cable specification reduction and the current-carrying capacity increase are considered.

The existing patent application CN201710144449 discloses a coaxial special high-current pulse cable, which structurally comprises an inner core, a braided layer, a wrapping layer, an inner insulation layer, an insulation protection layer, an outer conductor, a wrapping belt layer, an outer insulation layer and an outer protection layer, wherein the overall structure of the cable belongs to a low-voltage cable structure and cannot bear high voltage; the inner conductor is of a composite structure formed by twisting and weaving copper wires, a large gap exists between the inner conductor and the outer conductor, the skin effect current density of electric energy transmission is mainly concentrated on the periphery of the conductor, and the gap positioned outside influences the effective utilization area of the conductor and reduces the current-carrying capacity; meanwhile, the outer conductor adopts a multilayer braided structure with poor shear stress resistance, and the bending performance of the cable is greatly influenced due to the fact that the layers are mutually restrained. Therefore, the existing patent can not meet the requirements of equipment on high current, high voltage resistance and super flexibility of the cable.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that exists among the prior art, the utility model provides a new super gentle heavy current pulse power cable optimizes through the structure in to the cable, can satisfy heavy current, high pressure resistant, low loop resistance and the super gentle performance requirement that pulse power system provided, effectively solves the problem that exists among the prior art.

The utility model discloses a concrete technological effect as follows:

the utility model provides an ultra gentle heavy current pulse power cable, includes the inner conductor, the outer cladding of inner conductor has the inner conductor to wrap the package shielding layer, the inner conductor has inner conductor semiconduction shielding layer, internal insulation shielding layer to set gradually outside the package shielding layer, the internal insulation shielding layer is equipped with the outer conductor outward, the outer conductor include the inseparable winding layer of individual layer metallization transposition copper strand syntropy and individual layer metallization copper wire weaving layer, the inseparable winding layer of individual layer metallization transposition copper strand syntropy twines outside the internal insulation shielding layer, the cladding of individual layer metallization copper wire weaving layer is in on the inseparable winding layer of individual layer metallization transposition copper strand syntropy, the outer cladding of outer conductor has the outer conductor to wrap the package shielding layer, the outer crowded package of outer conductor has the sheath outward.

The single-layer metalized stranded copper compound yarn equidirectional tight winding layer is composed of compound yarns which are tightly arranged and wound outside the inner insulation layer in a single direction, the compound yarns are obtained by bundling and twisting a plurality of monofilaments with the diameter of 0.2-0.25 mm in the same direction with the diameter ratio of 8-10 times, and the winding direction of the compound yarns is the same as the bundle twisting direction of the monofilaments;

the single-layer metal-plated copper wire braided layer is formed by braiding single-layer metal-plated copper wires in a two-over-two-under mode at a braiding angle of 60-70 degrees, and the braiding coverage rate is not lower than 90%.

The inner conductor is formed by twisting a plurality of layers of strands, the twisting directions of the strands of adjacent layers are opposite, the strands are formed by twisting a plurality of tinned annealed copper wires with the diameters of 0.1-0.2 mm in the same direction, and the twisting pitch of the strands is 9-9.5 times of the minimum practical pitch-diameter ratio.

The outer conductor and the inner conductor are coaxially arranged, the outer conductor and the inner conductor are made of the same material, and the cross sections of the outer conductor and the inner conductor are equal.

The inner conductor semi-conductive shielding layer, the inner insulation layer and the inner insulation shielding layer are of a three-layer co-extrusion structure.

Wherein the maximum thickness of the same one of the inner conductor semiconductive shield layer, inner insulation shield layer is no more than 1.1 times its minimum thickness.

Wherein, the preparation material of the inner insulation and the outer insulation is ethylene propylene rubber material with high temperature resistance of 125 ℃; the preparation materials of the inner conductor semi-conductive shielding layer and the inner insulation shielding layer are ethylene propylene rubber mixture type shielding materials with high temperature resistance of 125 ℃, and the Shore hardness A of the ethylene propylene rubber mixture type shielding materials is not more than 75.

The inner conductor lapping shielding layer and the outer conductor lapping shielding layer are formed by overlapping and lapping high-strength thin semi-conductive cloth with the thickness of 0.08mm +/-0.02 mm, and the lapping rate of the overlapping and lapping is 15-20%.

Wherein the sheath is made of thermoplastic polyester elastomer or polyether polyurethane elastomer with low temperature resistance of-50 ℃.

Advantageous effects

The utility model discloses an optimize cable structure, keep stable in structure when the cable bears high-pressure environment, pulse heavy current transmission, high bending and radial transient state electromagnetic force, do not take place external insulation and sheath damage, satisfied the heavy current that pulse power system provided, high pressure resistant, low loop resistance and super gentle performance requirement, solved the problem that exists among the prior art.

The coaxial structure of the inner conductor and the outer conductor adopts the same material, the same section and the same resistance to form a loop to realize low loop resistance, improve the utilization efficiency of the conductors, eliminate the electrodynamic force between the loop conductors through the currents with opposite directions and equal magnitude respectively, and ensure that the cable can not generate radiation influence with surrounding cables and equipment.

The flexible inner conductor is used, so that the integral bending radius of the cable can reach 4 times of that of the cable, and is far smaller than the performance that the existing medium-high voltage cable can only reach 9-12 times of that of the cable, and the cable is more suitable for the working conditions of small space, large-angle rotation and pitching action of pulse equipment.

The soft high-temperature-resistant insulation and the high-temperature-resistant 125-DEG C-resistant soft ethylene propylene rubber are used for increasing the current-carrying capacity by about 50 percent compared with that of a 90-DEG C insulated cable, and the cross section of a conductor is reduced under the same current-carrying capacity, so that the outer diameter, weight, bending radius and bending force of the cable are reduced, and the comprehensive performance is improved. The extruded semi-conductive shield and the insulation and the extruded insulation shield adopt three-layer co-extrusion, can be compactly combined into a whole and bear high voltage.

The use of a wrapped shield has the following benefits: 1. balancing a non-uniform electric field formed by uneven twisted surfaces of the inner conductor strands; 2. when the cable is bent, sliding is formed between the inner conductor and the three-layer co-extrusion structure, so that the bending stress is reduced, the insulation early ageing is caused, and the service life is shortened; 3. the bending radial resistance is reduced, the bending force of the cable is reduced, and the equipment efficiency is improved. 4. Compared with the 0.2mm semi-conductive belt which is commonly used in the industry, the outer diameter and the weight of the cable can be reduced, and the requirement of equipment on lightening the corollary equipment and materials is met.

The Thermoplastic Polyester Elastomer (TPE) and the polyether polyurethane elastomer (PUR) sheath are used, and the TPE has the performance of vulcanized rubber, has outstanding mechanical strength, excellent rebound resilience and wide use temperature, and particularly has the performance of the vulcanized rubber and the processing characteristics of thermoplastic plastics. The polyurethane elastomer has the performance characteristics of small specific gravity, excellent elasticity, excellent tensile property and wear resistance, good mechanical strength, oil resistance, ozone resistance, low temperature property and flexibility, the use environment temperature can reach-50 ℃, the polyether polyurethane has hydrolytic resistance and chemical corrosion resistance in the environment with fresh water, seawater or high humidity, can effectively resist weather erosion, has low friction or anti-sticking property when meeting water, is in mutual contact sliding between cables, has small moving resistance, and is particularly suitable for frequently winding or moving the sheath of the cable under severe working condition environment. Both can satisfy the requirement of the temperature rise of the outer surface of the cable generated when the temperature of the cable conductor is 125 ℃.

Through the cable finished product after setting up above, through key technologies such as super gentle conductor transposition, coaxial structure low loop resistance, high temperature soft rubber insulation, anti shear stress and prevent outer conductor bending fracture, the heavy current that finally realizes pulse power system and put forward, high pressure resistant, low loop resistance and super gentle performance requirement.

Drawings

FIG. 1 is a schematic view of the present invention

Wherein, 1 is the inner conductor, 2 is the inner conductor around the package shielding layer, 3 is the inner conductor semiconductive shield layer, 4 is the internal insulation, 5 is the internal insulation shielding layer, 6a is the inseparable winding layer of individual layer metallization transposition copper strand syntropy, 6b is individual layer metallization copper wire weaving layer, 7 is the outer conductor around the package shielding layer, 8 is external insulation, 9 is the sheath.

Detailed Description

The cable of the utility model comprises an inner conductor 1, an inner conductor wrapping shielding layer 2 is coated outside the inner conductor 1, an inner conductor semi-conductive shielding layer 3, an inner insulation 4 and an inner insulation shielding layer 5 are sequentially arranged outside the inner conductor wrapping shielding layer 2, an outer conductor is arranged outside the inner insulating shielding layer 5, the outer conductor comprises a single-layer metal-plated twisted copper strand equidirectional tight winding layer 6a and a single-layer metal-plated copper wire braided layer 6b, the single-layer metal-plated twisted copper stranded wire equidirectional tight winding layer 6a is wound on the inner insulation shielding layer 5, the single-layer metal-plated copper wire braided layer 6b is coated on the single-layer metal-plated twisted copper strand equidirectional tight winding layer 6a, the outer conductor is wrapped by an outer conductor wrapping shielding layer 7, an outer insulator 8 is extruded outside the outer conductor wrapping shielding layer 7, and a sheath 9 is extruded outside the outer insulator 8.

The utility model discloses compare prior art, keep stable in structure when the cable bears high-pressure environment, pulse heavy current transmission, high bending and radial transient state electromagnetic force, do not take place external insulation and sheath damage, satisfied the heavy current that pulse power system provided, high pressure resistant, low loop resistance and super gentle performance requirement, solved the problem that exists among the prior art.

Specifically, the single-layer metalized stranded copper strand equidirectional tightly-wound layer 6a is composed of strands which are tightly arranged and wound outside the inner insulation 4 in a single direction, the strands are obtained by stranding a plurality of monofilaments with the diameter of 0.2-0.25 mm in a equidirectional manner with the small pitch ratio of 8-10 times, and the winding direction of the strands is the same as the stranding direction of the monofilaments. Specifically, the single-layer metal-plated copper wire braided layer 6b is formed by braiding single-layer metal-plated copper wires in a two-up-two-down mode at a braiding angle of 60-70 degrees, and the braiding coverage rate is not lower than 90%. So set up, the cable is soft easily crooked, and shielding performance compares prior art more outstanding.

Wherein preferred, the inner conductor 1 is formed by the transposition of a plurality of layers of strand, adjacent layer strand transposition opposite direction, the strand is formed by the syntropy bunch of a plurality of diameters for 0.1mm ~ 0.2 mm's tin-plating annealing copper wire, its transposition pitch of strand is limit minimum practical pitch ratio 9-9.5 times. The utility model discloses use this kind of inner conductor, can be so that the whole bend radius of cable can reach the bend radius of cable 4 times, be less than the 9-12 times bend radius performance that has had well high voltage cable far away, be fit for the pulse more and equip that the space is little, wide-angle gyration and every single move action operation operating mode.

Specifically, the outer conductor and the inner conductor 1 are arranged coaxially, and have the same material and the same cross-sectional area. So set up, interior outer conductor resistance equals, when outer conductor and inner conductor constitute the return circuit, can realize low return circuit resistance to improve the utilization efficiency of conductor, outer conductor and inner conductor pass through opposite direction, the electric current that the size equals respectively, can eliminate the electrodynamic force between the return circuit conductor, make the cable can not produce the radiation influence with surrounding cable and equipment.

Particularly, inner conductor semiconduction shielding layer 3, internal insulation 4, internal insulation shielding layer 5 are three-layer crowded structure altogether, so set up can be as an organic whole with the closely knit combination of three, compare prior art and can bear higher voltage.

Preferably, the thickness of any one of the inner conductor semi-conductive shielding layer 3, the inner insulation 4 and the inner insulation shielding layer 5 is not more than 1.1 times of the thickness of other layers, so that the flexibility of the cable and the safe transmission of high voltage and large current can be ensured.

Specifically, the inner conductor lapping shielding layer 2 and the outer conductor lapping shielding layer 7 are formed by overlapping and lapping high-strength thin semi-conductive cloth with the thickness of 0.08mm +/-0.02 mm, and the lapping rate of the lapping is 15-20%. By the arrangement, uneven electric field balance caused by uneven stranded surface of the inner conductor 1 strand can be balanced; secondly, when the cable is bent, the inner conductor 1 and the outer structure thereof can slide, so that the bending stress is reduced, the insulation early aging is reduced, and the service life is shortened; moreover, the bending radial resistance can be reduced, the cable bending force is reduced, and the equipment efficiency is improved; finally, the cable outer diameter and weight can be reduced compared to the 0.2mm semiconductive tapes customary in the prior art, complying with the lightening requirements of the equipment for the equipment and materials.

Specifically, the inner conductor semiconductive shielding layer 3 and the inner insulation shielding layer 5 are both made of ethylene propylene rubber mixture type shielding materials resistant to high temperature of 125 ℃, and the Shore hardness A of the ethylene propylene rubber mixture type shielding materials is not more than 75.

Specifically, the inner insulation 4 and the outer insulation 8 are made of ethylene propylene rubber materials with high temperature resistance of 125 ℃. After the material is subjected to a thermal aging test at 158 ℃ for 7 days, the mechanical property change rate of the material is not more than 30%, and compared with the conventional ethylene propylene rubber insulated cable at 90 ℃, the current-carrying capacity is increased by about 50%, so that the section of a conductor can be reduced under the same current-carrying capacity, the outer diameter, the weight, the bending radius and the bending force of the cable are further reduced, and the comprehensive performance is improved.

Specifically, the material of the sheath 9 is Thermoplastic Polyester Elastomer (TPE) or polyether polyurethane elastomer (PUR) resistant to low temperature of-50 ℃. The polyurethane elastomer has the performance characteristics of small specific gravity, excellent elasticity, excellent tensile property and wear resistance, good mechanical strength, oil resistance, ozone resistance, low temperature property and flexibility, the use environment temperature can reach-50 ℃, the polyether polyurethane has hydrolytic resistance and chemical corrosion resistance in the environment with fresh water, seawater or high humidity, can effectively resist weather erosion, has low friction or anti-sticking property when meeting water, is in mutual contact sliding between cables, has small moving resistance, and is particularly suitable for frequently winding or moving the sheath of the cable under severe working condition environment. Both can satisfy the requirement of the temperature rise of the outer surface of the cable generated when the temperature of the cable conductor is 125 ℃.

Claims (9)

1. The utility model provides an ultra gentle heavy current pulse power cable, its characterized in that, includes inner conductor (1), the outer cladding of inner conductor (1) has the inner conductor to wrap around package shielding layer (2), the inner conductor has inner conductor semiconduction shielding layer (3), internal insulation (4), internal insulation shielding layer (5) to set gradually around package shielding layer (2) outward, internal insulation shielding layer (5) are equipped with the outer conductor outward, the outer conductor include individual layer metallisation transposition copper strand syntropy closely twine layer (6a) and individual layer metallisation copper wire weaving layer (6b), individual layer metallisation transposition copper strand syntropy closely twines layer (6a) and twines outside internal insulation shielding layer (5), individual layer metallisation copper wire weaving layer (6b) cladding is on individual layer metallisation transposition copper strand syntropy closely twines layer (6a), the outer cladding of outer conductor has outer conductor shielding layer (7), the outer conductor is wrapped with an outer insulation (8) in a wrapping mode outside the wrapping shielding layer (7), and a sheath (9) is wrapped outside the outer insulation (8) in a squeezing mode.

2. The cable according to claim 1, wherein the single-layer metallized twisted copper strand equidirectional tightly wound layer (6a) is composed of strands tightly arranged and wound outside the inner insulation (4) in a single direction, the strands are obtained by bundling a plurality of monofilaments with the diameter of 0.2-0.25 mm in the same direction with the small pitch ratio of 8-10 times, and the winding direction of the strands is the same as the bundle stranding direction of the monofilaments;

the single-layer metal-plated copper wire braided layer (6b) is formed by braiding single-layer metal-plated copper wires in a two-over-two-under mode at a braiding angle of 60-70 degrees, and the braiding coverage rate is not lower than 90%.

3. The cable according to claim 1, wherein the inner conductor (1) is formed by twisting a plurality of layers of strands, the strands of adjacent layers are twisted in opposite directions, the strands are formed by twisting a plurality of tinned annealed copper wires with the diameter of 0.1-0.2 mm in the same direction, and the twisting pitch of the strands is 9-9.5 times of the minimum practical pitch ratio.

4. A cable according to claim 1, characterized in that the outer conductor is arranged coaxially with the inner conductor (1) and is of the same material and of equal cross-sectional area as the inner conductor (1).

5. The cable according to claim 1, wherein the inner conductor semiconductive shield layer (3), the inner insulation (4) and the inner insulation shield layer (5) are of a three-layer co-extruded structure.

6. A cable according to claim 1, characterized in that the maximum thickness of the same one of the inner conductor semiconductive shield (3), inner insulation (4), inner insulation shield (5) does not exceed 1.1 times its minimum thickness.

7. A cable according to claim 1, characterized in that the inner insulation (4) and the outer insulation (8) are made of ethylene propylene rubber material resistant to high temperatures of 125 ℃; the inner conductor semi-conductive shielding layer (3) and the inner insulation shielding layer (5) are both made of ethylene propylene rubber mixture type shielding materials resistant to high temperature of 125 ℃, and the Shore hardness A of the ethylene propylene rubber mixture type shielding materials is not more than 75.

8. The cable of claim 1, wherein the inner conductor lapping shield layer (2) and the outer conductor lapping shield layer (7) are both formed by lapping high-strength thin semi-conductive cloth with a thickness of 0.08mm ± 0.02mm, and the lapping rate of the lapping is 15-20%.

9. Cable according to claim 1, characterized in that the material of the sheath (9) is a thermoplastic polyester elastomer or a polyether polyurethane elastomer resistant to low temperatures of-50 ℃.

Images