Flexible high-frequency high-voltage pulse cable

Abstract

The utility model discloses a flexible high-frequency high-voltage pulse cable, which comprises a central cushion layer, an inner conductor layer, an insulating layer, an outer conductor layer and a sheath layer which are arranged from inside to outside, a plurality of strands of wires are uniformly distributed in the inner conductor layer and the outer conductor layer; and shielding layers are arranged outside the inner conductor layer, the insulating layer and the outer conductor layer. According to the utility model, the inner conductor layer and the outer conductor layer adopt a segmented stranded conductor structure, so that the influence of skin effect on cable flow can be effectively reduced, and the cable is more suitable for high-frequency and high-voltage use conditions; polypropylene materials are adopted for insulation and isolation, the dielectric loss is small, the strength and the heat resistance are better, and the electrical performance can be better guaranteed under high-voltage pulse; and the shielding layer is arranged, so that static interference and electromagnetic induction can be prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic pulse special equipment, in particular to a flexible high-frequency and high-voltage pulse cable. Background Art

[0002] With the popularization of special welding equipment, electromagnetic pulse technology (EMPT) can connect, weld, form and cut metals. It is especially suitable for metal pipes with strong conductivity, such as aluminum, copper, steel, etc.; and EMPT can compress or expand asymmetric cross-sections to perform mechanical sealing, solid phase welding, or simple shape changes as needed.

[0003] Due to the high speed of EMPT, the microstructure of the solid phase weld produced can be close to that of explosive welding or explosive cladding. The required magnetic pressure range of the pulse generator metal deformation is 100N / mm 2 To generate this pressure, a pulse current in the range of 100KA to 1000KA is required. At the same time, pulse technology requires high voltage narrow pulses, instantaneous high power, miniaturization of equipment, and convenient mobile use. Therefore, higher requirements are placed on the high voltage pulse cable's high voltage resistance, low loss, low impedance, high shielding and flexibility.

[0004] At the same time, most of the existing high-voltage pulse cables are non-shielded structures, which cannot effectively prevent the influence of external electric and magnetic fields and have low interference protection. At the same time, the existing high-voltage pulse cables are prone to skin effect, which ultimately leads to an increase in power loss. Utility Model Content

[0005] The main purpose of the utility model is to provide a flexible high-frequency and high-voltage pulse cable with high interference protection and low skin effect.

[0006] The flexible high-frequency high-voltage pulse cable provided by the utility model comprises a central cushion layer, an inner conductor layer, an insulating layer, an outer conductor layer and a sheath layer arranged from the inside to the outside; a plurality of wires are evenly arranged in the inner conductor layer and the outer conductor layer, and a shielding layer is arranged outside the inner conductor layer, the insulating layer and the outer conductor layer.

[0007] In one embodiment of the above cable, the central cushion layer is a cylindrical inner core made of polypropylene.

[0008] In one embodiment of the above cable, the inner conductor layer has 37 strands of wires evenly arranged in a double-layer unidirectional structure to surround the central cushion layer.

[0009] In one embodiment of the above cable, 42 strands of wires are evenly arranged in a single-layer structure in the outer conductor layer.

[0010] In one implementation of the above cable, Category VI twisted conductors are evenly distributed in the conductors and are wrapped and isolated by an isolation layer.

[0011] In one implementation of the above cable, the isolation layer is made of polytetrafluoroethylene.

[0012] In one embodiment of the above cable, the insulation layer is made of 35kV polypropylene mixed material.

[0013] In one embodiment of the above cable, the shielding layer is a semi-conductive nylon wrapped structure.

[0014] In one embodiment of the above cable, the sheath layer is made of a flame-retardant TPV mixed material.

[0015] The beneficial effects of the utility model are:

[0016] 1. The inner conductor layer and the outer conductor layer adopt a split twisted conductor structure, which can effectively reduce the impact of the skin effect on the cable flow and is more suitable for high frequency and high voltage use conditions;

[0017] 2. Insulation and isolation are made of polypropylene material, which has low dielectric loss, better strength and heat resistance, and can better guarantee its electrical performance under high voltage pulses;

[0018] 3. Setting up a shielding layer can resist electrostatic interference and electromagnetic induction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0020] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of one of the conductors. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the relevant technical solutions. Obviously, the described embodiments are only part of the embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1 As shown, the flexible high-frequency and high-voltage pulse cable disclosed in this embodiment includes a central cushion layer 1, an inner conductor layer 2, an inner conductor shielding layer 3, an insulating layer 4, an insulating shielding layer 5, an outer conductor layer 6, an outer conductor shielding layer 7 and a sheath layer 8.

[0023] The central cushion layer 1 is a cylindrical inner core made of polypropylene. The central cushion layer can play a supporting role, so that the cable structure can be kept from being deformed under conditions such as twisting and bending, and the impedance consistency can be ensured.

[0024] In the inner conductor layer 2, 37 strands of wire are evenly arranged in a double-layer unidirectional structure to surround the central cushion layer 1. Figure 2 As shown, each strand of the conductor is evenly distributed with a sixth type of twisted conductor 9 which is wrapped and isolated by an isolation layer 10 .

[0025] Category VI twisted conductors are more flexible and can ensure the bending performance of the cable during use.

[0026] The isolation layer is made of polytetrafluoroethylene tape and sintered. The temperature resistance of polytetrafluoroethylene can reach above 250℃, which can ensure that the heat transfer generated by the instantaneous high voltage and high current of the cable will not cause damage. At the same time, the sintering process is adopted to make the wrapping layer completely form a whole, which will not cause the isolation layer to fail during the frequent movement of the cable, so that the conductors will be connected and the skin effect of the conductors will be increased.

[0027] The inner conductor layer 2 is surrounded by an inner conductor shielding layer 3 .

[0028] An insulating layer 4 of 35kV polypropylene mixed material is arranged outside the inner conductor shielding layer 3. Compared with cross-linked polyethylene, the processing method of this material is simpler, and no cross-linking equipment is required. Only a horizontal extruder is required, which can save more costs in energy consumption. At the same time, polypropylene has low dielectric loss, higher strength and heat resistance, and can better guarantee its electrical performance under high-voltage pulses.

[0029] The insulating layer 4 is surrounded by an insulating shielding layer 5 .

[0030] The outer side of the insulating shielding layer 5 is an outer conductor layer 6. In the outer conductor layer, 42 strands of wires are evenly arranged in a single-layer structure, and the structure of each strand of wire is the same as that of the wire in the inner conductor layer.

[0031] The impedance of the inner and outer conductor layers is 12Ω.

[0032] The outer conductor layer 6 is surrounded by an outer conductor shielding layer 7 .

[0033] The inner conductor shielding layer 3, the insulating shielding layer 5 and the outer conductor shielding layer 7 are wrapped with semi-conductive nylon material. By setting each shielding layer, air gap discharge can be eliminated and the working voltage of the cable can be increased. The cost of nylon material is lower than that of metal shielding, and it can achieve the effect of homogenizing the electric field and ensure the flexibility of the cable. Compared with the unshielded structure, it can effectively prevent the influence of external electric and magnetic fields, reduce pulse distortion, and significantly improve the interference defense degree.

[0034] The outer conductor shielding layer 7 is provided with a sheath layer 8. The sheath layer is made of a flame-retardant TPV mixed material, has a smooth and soft feel, and has the properties of weather resistance, temperature resistance, and fatigue resistance.

[0035] The cable of this embodiment has a maximum withstand voltage of 40kV / 5min, and can withstand a higher instantaneous pulse voltage of 200kV. At the same time, the use of small pitch bundles minimizes the attenuation of resistance and can meet the narrow pulse of 0.0002s.

[0036] The advantages of using this pulse cable are:

[0037] 1. The inner conductor layer and the outer conductor layer adopt a split twisted conductor structure, which can effectively reduce the influence of skin effect on cable flow and is more suitable for high frequency and high voltage use conditions.

[0038] 2. Insulation and isolation are made of polypropylene material, which has small dielectric loss, better strength and heat resistance, and can better guarantee its electrical performance under high voltage pulses.

[0039] 3. Setting up a shielding layer can resist electrostatic interference and electromagnetic induction.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although detailed descriptions are made with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A flexible high-frequency high-voltage pulse cable, characterized in that: It includes a central cushion layer, an inner conductor layer, an insulating layer, an outer conductor layer and a sheath layer arranged from the inside to the outside; A plurality of strands of conducting wires are evenly arranged inside the inner conductor layer and the outer conductor layer, and shielding layers are arranged outside the inner conductor layer, the insulating layer and the outer conductor layer.

2. The flexible high-frequency high-voltage pulse cable according to claim 1, characterized in that: The central cushion layer is a cylindrical inner core made of polypropylene.

3. The flexible high-frequency high-voltage pulse cable according to claim 1, characterized in that: The inner conductor layer has 37 strands of wires evenly arranged in a double-layer unidirectional structure to surround the central cushion layer.

4. The flexible high-frequency high-voltage pulse cable according to claim 3, characterized in that: The outer conductor layer has 42 strands of wires evenly arranged in a single-layer structure.

5. The flexible high-frequency and high-voltage pulse cable according to claim 4, characterized in that: The wire has twisted conductors of Category VI evenly distributed in it and is wrapped and isolated by an isolation layer.

6. The flexible high-frequency and high-voltage pulse cable according to claim 5, characterized in that: The isolation layer is made of polytetrafluoroethylene.

7. The flexible high-frequency and high-voltage pulse cable according to claim 1, characterized in that: The insulating layer is made of 35kV polypropylene mixed material.

8. The flexible high-frequency and high-voltage pulse cable according to claim 1, characterized in that: The shielding layer is a semi-conductive nylon wrapped structure.

9. The flexible high-frequency and high-voltage pulse cable according to claim 1, characterized in that: The sheath layer is made of flame-retardant TPV mixed material.

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