CN213844835U

CN213844835U - Military cable with high anti-interference performance

Info

Publication number: CN213844835U
Application number: CN202022768652.3U
Authority: CN
Inventors: 朱放; 王瑞庆; 张光亮
Original assignee: Nanjing Anda Wire And Cable Co ltd
Current assignee: Nanjing Anda Wire And Cable Co ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-07-30
Anticipated expiration: 2030-11-25

Abstract

The utility model relates to a high interference immunity military cable, it includes the core of leading by many galvanized copper wire strands are synthetic, it is equipped with the insulating layer outward to lead the core, the insulating layer is equipped with the shielding layer that is used for shielding electromagnetic field outward, the shielding layer is equipped with the restrictive coating outward, be equipped with a plurality of sealed warehouses on the restrictive coating, the sealed warehouse intussuseption is filled with inert gas, the restrictive coating is equipped with the metal armor outward. The metal armor can play the fire prevention effect to the cable in this application, and metal armor wearability is higher, and the reducible possibility that leads to influencing cable fire behavior because of metal armor produces wearing and tearing.

Description

Military cable with high anti-interference performance

Technical Field

The application relates to the field of cables, in particular to a military cable with high anti-interference performance.

Background

At present, cables are generally formed by twisting several or several groups of conductors, each group of conductors being insulated from each other and twisted around a center, and the outer layer being covered with a highly insulating layer having characteristics of inner current conduction and outer insulation, and transmit power or information from one place to another.

Chinese patent No. CN209591652U discloses an anti-interference cable, which includes a coaxial cable, an insulating sheath, a glass fiber rod and a coaxial cable, wherein the outer surface of the coaxial cable is wrapped with a second shielding layer, a first shielding layer is arranged between the glass fiber rod and the insulating sheath, and the outer surface of the insulating sheath is coated with a fire-proof coating.

In view of the above-mentioned related arts, the inventors consider that there is a defect that the fireproof coating is easily worn after long-term use to cause the decrease of the fireproof performance of the cable.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect that the fireproof performance of a cable is reduced due to the fact that a fireproof coating is prone to abrasion after long-term use, the application provides a military cable with high anti-interference performance.

The application provides a high interference immunity military cable adopts following technical scheme:

the utility model provides a high interference immunity military cable, includes the core of leading by many galvanized copper wire strands are synthetic, it is equipped with the insulating layer to lead the core outward, the insulating layer is equipped with the shielding layer that is used for shielding electromagnetic field outward, the shielding layer is equipped with the restrictive coating outward, be equipped with a plurality of sealed warehouses on the restrictive coating, the intussuseption of sealed warehouse is filled with inert gas, the restrictive coating is equipped with the metal armor outward.

Through adopting above-mentioned technical scheme, the cable that the core was made as leading to pure copper line to the tradition is used for a long time back copper line surface can oxidize and form verdigris, and verdigris conductivity is extremely poor for lead core resistance increase, galvanized copper line refers to the copper line of the thin metallic tin of one deck at copper line surface plating, and the reducible copper line takes place the possibility of oxidation, and galvanized copper line corrosion resistance is good, can prolong the life of cable greatly. From the electrical property, because resistance can lead to the core to generate heat, can influence the life of insulating layer and restrictive coating along with the rising of temperature, and extravagant electric energy, its cross-sectional area of the core is great is led in the stranding of many galvanized copper wires, can reduce the resistance of leading the core, can prolong the life of product when practicing thrift the electric energy. Compared with a single wire with a large cross section, the conducting core formed by stranding a plurality of galvanized copper wires has better flexibility, is convenient to bend, and is favorable for production, transportation, installation and laying. The insulating layer can play the insulating effect to leading the core, and the shielding layer reducible external electromagnetic field produces the possibility that influences to the cable to improve the interference immunity of cable, simultaneously, also can reduce the cable outwards radiate the electromagnetism and produce the possibility that influences to external instrument. The sheath layer has the effects of protecting and insulating the cable, the possibility of influence of external interference on the cable is reduced, the softness and the elasticity of the insulating layer can be improved due to the arrangement of the sealing bin, and the impact resistance of the sheath layer is improved, so that the cable is better protected by the sheath layer; the inert gas has inactive chemical property, is not easy to generate chemical reaction, and can improve the acid resistance and the alkali resistance of the sheath layer. The metal armor layer can play the fire prevention effect to the cable, and metal armor layer wearability is higher, reducible because of the metal armor layer produces wearing and tearing and lead to influencing the possibility of cable fire behavior.

Optionally, the sheath layer is made of cross-linked polyethylene.

By adopting the technical scheme, the insulating polyethylene has the advantages of low dielectric loss, high alternating current breakdown strength and good insulativity, and meanwhile, the low temperature resistance and the water resistance of the polyethylene are good, so that the polyethylene is a common material for a cable sheath layer. However, polyethylene has a melting point that is too low and is susceptible to cracking under mechanical stress. The crosslinked polyvinyl chloride is prepared by crosslinking polyvinyl chloride by high-energy irradiation or a chemical method, molecules have an original linear structure and are crosslinked into a net structure, thermoplasticity is changed into thermosetting, the excellent performance of polyethylene is kept, the heat resistance and the heat stability are improved, and the mechanical strength is high at high temperature. The maximum operation temperature of the cable adopting the polyvinyl chloride as the sheath layer can reach 90 ℃, and the temperature application range of the cable is expanded.

Optionally, a wrapping layer made of natural silk is arranged between the guide core and the insulating layer.

Through adopting above-mentioned technical scheme, the winding covering that the natural silk was made can increase dielectric strength, and reduces the surface temperature of leading the core.

Optionally, a polypropylene layer is disposed between the insulating layer and the shielding layer.

By adopting the technical scheme, the polypropylene has the advantages of lower specific gravity, high tensile strength, high elongation and low dielectric constant, and can improve the tensile strength of the cable and reduce the bending radius of the cable.

Optionally, the insulating layer is made of polyvinyl chloride.

By adopting the technical scheme, the polyvinyl chloride is a material with excellent insulating property, and the insulating layer made of the polyvinyl chloride can play an excellent insulating and protecting role on the cable.

Optionally, the shielding layer comprises an aluminum foil layer.

By adopting the technical scheme, the aluminum foil is a metal foil conductive material, can shield electromagnetism, is thinner, can reduce the possibility that the cable is influenced by an external electromagnetic field, and can also reduce the possibility that an interference electromagnetic field generated in the cable diffuses outwards.

Optionally, there are two aluminum foil layers, and a copper wire mesh is fixedly connected between the two aluminum foil layers.

Through adopting above-mentioned technical scheme, the copper wire has good wire guide nature, and consequently the copper wire can regard as the drainage wire of shielding layer to reinforcing shielding layer's electric conductivity, so can reinforcing shielding layer's shielding effect, simultaneously, because the aluminium foil is more fragile, the copper wire net has good toughness, difficult rupture can play the supporting role to the aluminium foil layer, has reduced because of the fracture of aluminium foil layer influences the possibility of shielding effect.

Optionally, the metal armor layer is formed by weaving copper-plated core wires, and the cladding rate of the metal armor layer is about 70% -80%.

By adopting the technical scheme, the metal armor layer is made of the same material as the guide core, so that the electromagnetic force generated by the guide core can be absorbed by the metal armor layer, the possibility of influence of the electromagnetic field generated on the cable on the outside is further reduced, and the anti-interference performance of the cable is improved. The anti-interference strength depends on the coating rate, the higher the coating rate is, the higher the anti-interference performance is, but the cable becomes rigid due to the excessively high coating rate, and when the coating rate is between 70% and 80%, the anti-interference performance is higher and the cable has certain softness.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the metal armor layer can play a role in preventing fire for the cable, and the metal armor layer has high wear resistance, so that the possibility of influencing the fire-proof performance of the cable due to abrasion of the metal armor layer can be reduced;

2. the shielding layer can reduce the possibility that an external electromagnetic field influences the cable so as to improve the anti-interference performance of the cable, and meanwhile, the possibility that the cable radiates electromagnetic waves outwards to influence external instruments can be reduced;

3. the setting of sealed storehouse can improve the compliance and the elasticity degree of insulating layer, improves the shock resistance of restrictive coating to make the restrictive coating better to the guard action of cable.

Drawings

Fig. 1 is a schematic overall structure diagram of a military cable with high anti-interference performance according to an embodiment of the present application.

Description of reference numerals: 1. a guide core; 2. wrapping a covering; 3. an insulating layer; 4. a polypropylene layer; 5. a shielding layer; 6. a copper wire mesh; 7. a sheath layer; 71. sealing the bin; 8. a metal armor layer.

Detailed Description

The present application is described in further detail below with reference to fig. 1.

The embodiment of the application discloses high interference immunity military cable.

Referring to fig. 1, the military electricity with high anti-interference performance comprises a guide core 1, wherein the guide core 1 is sequentially and tightly wrapped with a wrapping layer 2, an insulating layer 3, a polypropylene layer 4, a shielding layer 5, a sheath layer 7 and a metal armor layer 8 from inside to outside. The conductive core 1 is formed by twisting two galvanized copper wires, and is designed as a twisted pair, compared with the single-conductor conductive core 1, the twisted pair can increase the cross-sectional area of the conductive core 1, so that the resistance of the conductive core 1 is smaller, and the possibility that the service life of a cable is influenced by resistance heat generated by the conductive core 1 is reduced. Meanwhile, due to the design of the twisted pair, the induction magnetic fields between two adjacent wires can be mutually offset, so that the interference from adjacent cables can be resisted, the interference of self signals to the outside can be reduced, and the anti-interference performance of the cables is enhanced.

Referring to fig. 1, the wrapping layer 2 is tightly wrapped outside the guide core 1, the wrapping layer 2 is made of natural silk, and the natural silk is continuous long fiber formed by coagulation of silk liquid secreted by a mature silkworm during cocooning, and is also called silk, and is natural fiber. The pitch of the twisted pair affects the anti-interference capability, generally, the smaller the pitch, the stronger the anti-interference capability, the wrapping layer 2 can tightly wrap the guide core 1, and the possibility that the intercept of the twisted pair is increased after long-term use is reduced. The natural silk made around covering 2 can provide and keep apart stray capacitance to reinforcing dielectric strength can reduce the temperature on leading core 1 surface simultaneously, further reduce because of leading core 1 generates heat and influence the possibility of cable life-span.

Referring to fig. 1, the insulating layer 3 is tightly wrapped outside the wrapping layer 2, the insulating layer 3 is made of polyvinyl chloride, and the polyvinyl chloride is a polymer formed by polymerizing polyethylene monomers, so that the conductive core has high volume electrosilvering and breakdown voltage, excellent insulating property and an insulating effect on the conductive core 1.

Referring to fig. 1, the polypropylene layer 4 is tightly wrapped outside the insulating layer 3, the polypropylene has a 1KHz dielectric constant of 2.5-2.75, and has good insulating property, so that the insulating property of the cable can be increased, the tensile strength of the cable is high, the elongation is good, the tensile strength of the cable can be improved, and the bending radius of the cable is reduced.

Referring to fig. 1, the shielding layer 5 is tightly wrapped on the outer side of the polypropylene layer 4, the shielding layer 5 comprises two aluminum foil layers, and a copper wire mesh 6 is fixedly pressed between the two aluminum foil layers. Electromagnetic shielding is the isolation of metal between two spatial regions, where a control electric field, magnetic field, and electromagnetic wave are induced and radiated from one region to the other. The aluminum foil has good electromagnetic shielding performance, the possibility that an external electromagnetic field influences the cable can be reduced, the possibility that the electromagnetic field generated when the cable is used diffuses outwards can be reduced, and the anti-interference performance of the cable is improved. The copper wire has excellent conductivity and can be used as a drainage wire of the aluminum foil layer to form a continuous lead with the aluminum foil layer, so that the shielding property of the shielding layer 5 is improved. Meanwhile, the copper wire has excellent toughness, so that the copper wire is not easy to break, and the aluminum foil is brittle, so that the possibility of fracture of the aluminum foil layer can be reduced by the copper wire mesh 6. If the aluminum foil layer is broken after long-term use, the copper wire mesh 6 can play a role in continuously connecting the aluminum foil layer.

Referring to fig. 1, the sheath layer 7 is tightly wrapped on the outer side of the shielding layer 5 to protect the cable. The sheath layer 7 is made of cross-linked polyvinyl chloride, the cross-linked polyvinyl chloride is made by cross-linking polyvinyl chloride under high-energy irradiation or a chemical method, the cross-linked polyvinyl chloride keeps high insulativity, small specific gravity, acid resistance, alkali resistance and water resistance of the polyvinyl chloride, simultaneously makes up the defects of low heat resistance and poor heat stability of the polyvinyl chloride, has higher mechanical strength, and the maximum operation temperature of the cable using the cross-linked polyvinyl chloride as the sheath can reach 90 ℃. The applicable temperature range of the cable is expanded. Sealing bins 71 are arranged in the sheath layer 7, the sealing bins 71 are not communicated, and inert gas which can be nitrogen is filled in the sealing bins 71. The setting of sealed storehouse 71 can improve the compliance and the elasticity degree of restrictive coating 7, can improve the crushing resistance of restrictive coating 7 simultaneously, prolongs the life of cable. Nitrogen is inert as an inert gas, is chemically inert, is not prone to chemical reaction, can improve the acid and alkali resistance of the sheathing layer 7, and is not flammable or flammable, and can improve the fire resistance of the sheathing layer 7.

Referring to fig. 1, the metal armor layer 8 is tightly wrapped outside the sheath layer 7, the metal armor layer 8 is formed by weaving galvanized copper wires, and the wrapping rate of the metal armor layer 8 on the cable is 75%. The metal armor layer 8 and the guide core 1 are made of the same material, can fully absorb the influence of electromagnetic force generated by the guide core 1, can resist the influence of external electromagnetic force on the guide core 1, and has effective anti-interference capability for wide frequency bands. The anti-interference strength depends on the coating rate of the metal armor layer 8, and when the coating rate is 75%, the cable has a strong anti-interference effect and can reduce the possibility that the cable is too stiff due to too high coating rate. Meanwhile, the galvanized copper is formed by plating metal zinc on the surface of copper, the zinc can reduce the possibility of contact between the copper and air, so that the copper is not easy to oxidize, and a compact oxide film can be formed on the surface of the zinc after the zinc is oxidized to reduce the possibility of further oxidation of the zinc, so that the copper galvanized copper has longer service life. Because the metal is incombustible, the metal armor layer 8 made of copper galvanizing has good fire resistance, is not easy to wear, and can reduce the possibility of cable fire resistance reduction caused by the wear of the metal armor layer 8.

The implementation principle of the military cable with high anti-interference performance in the embodiment of the application is as follows: the guide core 1 formed by twisting two copper galvanized wires has lower resistance and certain anti-interference performance; the wrapping layer 2 made of natural silk is tightly wrapped outside the guide core 1, so that the temperature of the surface of the guide core 1 can be reduced, the heat dissipation of the guide core 1 is facilitated, and the possibility of influencing the service life of a cable due to the heat generated by the guide core 1 is reduced; an insulating layer 3 made of polyvinyl chloride is tightly wrapped on the outer side of the wrapping layer 2 and plays an insulating role in insulating the guide core 1; the polypropylene layer 4 is tightly wrapped outside the insulating layer 3, so that the tensile strength of the cable can be improved, and the bending radius of the cable can be reduced; the shielding layer 5 is tightly wrapped on the outer side of the polypropylene layer 4, the shielding layer 5 comprises two aluminum foil layers, a copper wire mesh 6 is fixedly pressed between the two aluminum foil layers, the shielding layer 5 can play a role in shielding the cable, the possibility that an external electromagnetic field influences the cable can be reduced, the possibility that the electromagnetic field generated when the cable is used diffuses outwards can be reduced, and the anti-interference performance of the cable is improved; the sheath layer 7 made of cross-linked polyvinyl chloride is tightly wrapped on the outer side of the shielding layer 5, so that the cable is protected, the alkali resistance, acid resistance, water resistance and high temperature resistance of the cable are enhanced, and the cable has good mechanical strength; the metal armor layer 8 woven by the copper galvanized wires is tightly wrapped outside the sheath layer 7, so that the fire resistance and the anti-interference performance of the cable can be improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a high interference immunity military cable which characterized in that: include by many galvanized copper wire stranding lead core (1), it is equipped with insulating layer (3) outward to lead core (1), insulating layer (3) are equipped with shielding layer (5) that are used for shielding electromagnetic field outward, shielding layer (5) are equipped with restrictive coating (7) outward, be equipped with a plurality of sealed warehouses (71) on restrictive coating (7), sealed warehouse (71) intussuseption is filled with inert gas, restrictive coating (7) are equipped with metal armor (8) outward.

2. The high interference immunity military cable of claim 1, wherein: the sheath layer (7) is a sheath layer (7) made of cross-linked polyethylene.

3. The high interference immunity military cable of claim 1, wherein: and a wrapping layer (2) made of natural silk is arranged between the guide core (1) and the insulating layer (3).

4. The high interference immunity military cable of claim 1, wherein: and a polypropylene layer (4) is arranged between the insulating layer (3) and the shielding layer (5).

5. The high interference immunity military cable of claim 1, wherein: the insulating layer (3) is an insulating layer (3) made of polyvinyl chloride.

6. The high interference immunity military cable of claim 1, wherein: the shielding layer (5) comprises an aluminium foil layer.

7. The high interference immunity military cable of claim 6, wherein: the aluminum foil layers are provided with two layers, and a copper wire mesh (6) is fixedly connected between the two layers of the aluminum foil layers.

8. The high interference immunity military cable of claim 1, wherein: the metal armor layer (8) is formed by weaving copper-plated core wires, and the cladding rate of the metal armor layer (8) is about 70% -80%.