CN111933332A - Interference-preventing high-strength cable for central air conditioner - Google Patents
Interference-preventing high-strength cable for central air conditioner Download PDFInfo
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- CN111933332A CN111933332A CN202010646734.2A CN202010646734A CN111933332A CN 111933332 A CN111933332 A CN 111933332A CN 202010646734 A CN202010646734 A CN 202010646734A CN 111933332 A CN111933332 A CN 111933332A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0045—Cable-harnesses
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/184—Sheaths comprising grooves, ribs or other projections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1875—Multi-layer sheaths
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1895—Internal space filling-up means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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Abstract
The invention belongs to the technical field of wires and cables, and particularly relates to an anti-interference high-strength cable for a central air conditioner. The cable comprises a wire core, a fire-resistant buffer layer, a first shielding layer, a second shielding layer, a first sheath and a second sheath from inside to outside; the wire core comprises a limiting reinforcing rib with a quadrangular star-shaped section and four wires with insulating layers, and the fire-resistant buffer layer is a dust-free asbestos tape wound on the outer layer of the wire core; the first shielding layer is a copper net wrapped on the surface of the dust-free asbestos tape, and a metal tin coating is plated on the surface of the copper net; the second shielding layer is an aluminum tape wound on the surface of the copper mesh; the first sheath is an insulating sheath filled with an electromagnetic shielding agent, and the second sheath is made of an oil-resistant corrosion-resistant PVC cable sheath material. The cable has a multi-layer shielding structure, and the stability and the safety of the electromagnetic shielding effect are improved; in addition, the first sheath of the cable not only has an electromagnetic shielding effect, but also has better structural strength and stability.
Description
Technical Field
The invention belongs to the technical field of wires and cables, and particularly relates to an anti-interference high-strength cable for a central air conditioner.
Background
The central air conditioning system is composed of one or more cold and heat source systems and a plurality of air conditioning systems, and the system is different from the traditional refrigerant type air conditioner, and the air is intensively treated (such as a single machine, VRV) to achieve the comfort requirement. The principle of liquid gasification refrigeration is adopted to provide the required cold energy for the air conditioning system so as to offset the heat load of the indoor environment; the heating system provides the air conditioning system with the required heat to offset the indoor environment cooling and heating load.
An air conditioner control network management is added in the central control system, so that the unified control of the whole room air conditioner is realized; meanwhile, the independent control and use of the air conditioning system are not influenced. The special energy efficiency system for the air conditioner can automatically monitor the running state and running parameters of the household cooling and heating system and the indoor and outdoor environment temperature and humidity in all weather, and can automatically change the temperature set value in different seasons according to the outdoor temperature and humidity change. The control software of the central control system can regulate, collect, record, store and manage information and data about the air conditioning system. The intelligent air conditioner is an air conditioner with an automatic adjusting function. The intelligent air conditioning system can analyze and judge signals transmitted by the temperature, humidity and air cleanliness sensors according to preset indexes and according to external climate conditions, and automatically turn on the functions of refrigeration, heating, dehumidification, air purification and the like in time. Shielded cable is required to be used in the construction of the power communication network of intelligent air conditioner, and shielded cable's wire sinle silk includes power cable and communication cable, and the sinle silk is outer including the shielding layer, and the shielding layer can shield complicated electromagnetic environment around the wire, reduces the influence that causes the work of internal communication cable for shielded cable has outstanding interference killing feature. In a conventional communication cable, shielding layer materials such as a metal mesh, a metal foil or a metal tape are usually wound outside a wire core, and the shielding layer materials can complete the safety isolation of an electric field or a magnetic field outside a wire, so that an electromagnetic shielding effect is realized.
However, these conventional shielding layer materials are easily deformed during frequent bending, winding and stretching processes of the cable, and the deformed shielding layer structure may be damaged to generate damage points, which may affect the integrity of the shielding effect of the shielding material.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an anti-interference high-strength cable for a central air conditioner, which has a multi-layer shielding structure and improves the stability and the safety of an electromagnetic shielding effect; in addition, the first sheath of the cable not only has an electromagnetic shielding effect, but also has better structural strength and stability.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an anti-interference high-strength cable for a central air conditioner comprises a wire core, a fire-resistant buffer layer, a first shielding layer, a second shielding layer, a first sheath and a second sheath from inside to outside; the wire core comprises a limiting reinforcing rib with a quadrangular star-shaped cross section, wires with insulating layers are arranged on four arc-shaped edges of the limiting reinforcing rib, and the four wires comprise a power cable and a communication cable; the fire-resistant buffer layer is a dust-free asbestos tape wound on the outer layer of the wire core of the lead; the first shielding layer is a copper net wrapped on the surface of the dust-free asbestos tape, and a metal tin coating is plated on the surface of the copper net; the second shielding layer is an aluminum tape wound on the surface of the copper mesh; the first sheath is an insulating sheath filled with an electromagnetic shielding agent, and the second sheath is made of an oil-resistant corrosion-resistant PVC cable sheath material.
Preferably, the raw material components of the first sheath comprise, by mass: 30-45 parts of linear low-density polyethylene, 20-30 parts of ethylene propylene diene monomer, 4-8 parts of chlorosulfonated polyethylene, 15-30 parts of electromagnetic shielding agent, 5-7 parts of maleic anhydride grafted vinyl acetate copolymer, 3-4 parts of polyethylene wax, 1-3 parts of plasticizer and 0.5-2 parts of cross-linking agent.
Further preferably, the first sheath comprises the following raw material components in parts by mass: 37 parts of linear low-density polyethylene, 24 parts of ethylene propylene diene monomer, 5 parts of chlorosulfonated polyethylene, 18 parts of electromagnetic shielding agent, 6 parts of maleic anhydride grafted vinyl acetate copolymer, 3.5 parts of polyethylene wax, 2 parts of plasticizer and 1.5 parts of crosslinking agent.
The preparation method of the electromagnetic shielding agent comprises the following steps:
(1) uniformly ball-milling and mixing zinc powder, copper powder and iron-nickel alloy micro powder according to the mass ratio of 3:7:15, then blowing the mixed metal powder into a combustor, combusting the mixed metal powder in the combustor by using reducing gas, melting and evaporating the mixed metal micro powder, forming rotational flow in a combustion chamber of the combustor by using inert gas, spraying the metal into a cooling chamber filled with the inert gas by using an injector, and cooling to form spherical metal micro powder;
(2) grading the metal micro powder, selecting the metal micro powder with the particle size of 20-120nm, and forming a chromium coating on the surface of the metal micro powder by utilizing a chemical plating process; the thickness of the chromium coating in the obtained coating metal microsphere is 12-20% of the mass of the metal micro powder;
(3) mixing the plating layer metal microspheres and the nano graphene according to a mass ratio of 3:1, adding the mixture into a xylene solvent with the volume of 8-10 times, then dropwise adding 1.0-3.5 wt% of diethanolamine and 0.6-1.5 wt% of nonionic surfactant into the solvent, and performing ultrasonic dispersion treatment for 1-1.5h to obtain a dispersion liquid;
(4) and adding polyvinyl acetate resin accounting for 40-60% of the mass of the coated metal microspheres into the dispersion liquid in the previous step, heating to 115-130 ℃, stirring at the rotating speed of 450-600r/min for 3-5h to obtain a mixed solution, and performing spray drying and granulation on the mixed solution to obtain the required electromagnetic shielding agent.
Wherein, the content of nickel element in the iron-nickel alloy in the step (1) is 70-85%.
The reducing gas in the step (1) is one or a mixture of hydrogen and carbon monoxide.
And (4) selecting spheroidized graphene micro powder with the particle size of 150-300nm from the nano graphene in the step (3).
And (3) the surfactant in the step (3) is nonylphenol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether or isooctyl polyoxyethylene ether.
Preferably, the plasticizer in the raw material components of the first sheath is one of phthalate plasticizers, and the cross-linking agent is a mixture of di-tert-butyl peroxide and nano zinc oxide compounded according to a ratio of 5: 2.
The preparation method of the first sheath material provided by the invention comprises the following steps:
adding linear low-density polyethylene, ethylene propylene diene monomer, maleic anhydride grafted vinyl acetate copolymer and chlorosulfonated polyethylene into an internal mixer according to parts by weight, internally mixing at the temperature of 150-170 ℃ for 7-8min, naturally cooling and standing for 2-3h after internal mixing is completed, then adding an electromagnetic shielding agent, polyethylene wax and a cross-linking agent into the mixture, continuously mixing for 4-6min, finally adding an accelerator, mixing for 2-5min, extruding the mixture, cooling and granulating to obtain the required granular material for the first sheath.
The invention has the following beneficial effects:
in this type shielded cable, including communication cable and power cable in the sinle silk, set up spacing strengthening rib in the middle of the wire, spacing strengthening rib can improve the tensile property and the resistant performance of bending of wire on the one hand, and on the other hand can restrict the position of wire to avoid the wire to receive external force and take place to warp or shift, cause the influence to wire local strength.
Outer fire-resistant buffer layer of sinle silk is made by dustless asbestos tape, and dustless asbestos tape can carry out thermal-insulated fire-retardant protection to the wire of inside on the one hand, and on the other hand can fill outer clearance to improve the isolation buffering effect between the wire, avoid the wire mesh of first shielding layer to cause the destruction to the insulating layer of wire. The first shielding layer is a galvanized copper net layer, and the layer structure can shield a magnetic field generated by the internal cable, so that communication information leakage is avoided; and the second shielding layer is an aluminum belting layer, so that an electric field or a magnetic field of the outer environment of the wire can be isolated, and a good anti-interference effect is generated.
Be equipped with first sheath outside first shielding layer and second shielding layer, this sheath is different from traditional cable insulation sheath material, use multiple macromolecular material in sheath material's the prescription, and a special electromagnetic shield agent has been added, make first sheath material produce good electromagnetic shield effect, the setting of first sheath material is outer at the second shielding layer, even the second shielding layer produces the electromagnetism because of the structure damage and reveals, first sheath also can carry out the reinforcement to shielding effect, and because the substrate of first sheath mainly is polymer resin material, the structural stability of material is stronger, stretch-proofing more, bend and extrusion deformation, consequently, the stability of first sheath is better, electromagnetic shield effect's security and stability are higher.
The electromagnetic shielding agent is prepared from alloy spheroidized micro powder and spheroidized nano graphene which are produced by a special process, the outer layers of the alloy spheroidized micro powder and the spheroidized nano graphene are subjected to surface treatment and then are coated with polyvinyl acetate, the electromagnetic shielding agent has good electromagnetic shielding effect and especially has outstanding shielding effect on a high-frequency electromagnetic field, so the electromagnetic shielding agent is very suitable for being applied to electromagnetic isolation protection in a complex environment, and in addition, the electromagnetic shielding agent can be well dispersed and compatible with high polymer resin in a sheath material due to the special surface treatment, so that the electromagnetic shielding agent is uniformly distributed in a sheath base material, the uniformity and the stability of the electromagnetic shielding effect are improved, and the electromagnetic shielding agent can generate a synergistic effect with maleic anhydride grafted vinyl acetate copolymer in the base material, so that the electromagnetic shielding agent is fully crosslinked with polyethylene resin, ethylene propylene diene monomer and chlorosulfonated polyethylene, the weather resistance and the stability of the sheath material are improved, and the influence of the filling of the electromagnetic shielding agent on the toughness and the structural strength of the cable material is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic sectional view of a shielded cable according to the present embodiment;
labeled as: 1. limiting reinforcing ribs; 2. a wire; 3. a refractory buffer layer; 4. a first shielding layer; 5. a second shielding layer; 6. a first sheath; 7. a second sheath.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or circuit connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
Example 1
As shown in fig. 1, the anti-interference high-strength cable for the central air conditioner comprises a conductor core, a fire-resistant buffer layer, a first shielding layer, a second shielding layer, a first sheath and a second sheath from inside to outside; the wire core comprises a limiting reinforcing rib with a quadrangular star-shaped cross section, wires with insulating layers are arranged on four arc-shaped edges of the limiting reinforcing rib, and the four wires comprise a power cable and a communication cable; the fire-resistant buffer layer is a dust-free asbestos tape wound on the outer layer of the wire core of the lead; the first shielding layer is a copper net wrapped on the surface of the dust-free asbestos tape, and a metal tin coating is plated on the surface of the copper net; the second shielding layer is an aluminum tape wound on the surface of the copper mesh; the first sheath is an insulating sheath filled with an electromagnetic shielding agent, and the second sheath is made of an oil-resistant corrosion-resistant PVC cable sheath material.
The first sheath comprises the following raw material components in parts by mass: 30 parts of linear low-density polyethylene, 20 parts of ethylene propylene diene monomer, 4 parts of chlorosulfonated polyethylene, 15 parts of electromagnetic shielding agent, 5 parts of maleic anhydride grafted vinyl acetate copolymer, 3 parts of polyethylene wax, 1 part of plasticizer and 0.5 part of cross-linking agent.
The preparation method of the electromagnetic shielding agent comprises the following steps:
(1) uniformly ball-milling and mixing zinc powder, copper powder and iron-nickel alloy micro powder according to the mass ratio of 3:7:15, then blowing the mixed metal powder into a combustor, combusting the mixed metal powder in the combustor by using reducing gas, melting and evaporating the mixed metal micro powder, forming rotational flow in a combustion chamber of the combustor by using inert gas, spraying the metal into a cooling chamber filled with the inert gas by using an injector, and cooling to form spherical metal micro powder;
(2) grading the metal micro powder, selecting the metal micro powder with the particle size of 20-120nm, and forming a chromium coating on the surface of the metal micro powder by utilizing a chemical plating process; the thickness of the chromium coating in the obtained coating metal microsphere is 15% of the mass of the metal micro powder;
(3) mixing the plating layer metal microspheres and the nano graphene according to a mass ratio of 3:1, adding the mixture into a 9-time volume xylene solvent, then dropwise adding 2.5 wt% of diethanolamine and 0.9 wt% of nonionic surfactant into the solvent, and performing ultrasonic dispersion treatment for 1.3h to obtain a dispersion liquid;
(4) and adding polyvinyl acetate resin accounting for 50% of the mass of the coated metal microspheres into the dispersion liquid in the previous step, heating to 120 ℃, stirring for 4 hours at a rotating speed of 500r/min to obtain a mixed solution, and performing spray drying and granulation on the mixed solution to obtain the required electromagnetic shielding agent.
Wherein, the content of nickel element in the iron-nickel alloy in the step (1) is 80%.
The reducing gas in step (1) is a mixed gas of hydrogen and carbon monoxide.
And (4) selecting spheroidized graphene micro powder with the particle size of 150-300nm from the nano graphene in the step (3).
And (4) in the step (3), the surfactant is polyoxyethylene lauryl ether.
The plasticizer in the raw material components of the first sheath is dimethyl phthalate, and the cross-linking agent is a mixture of di-tert-butyl peroxide and nano zinc oxide compounded according to a ratio of 5: 2.
The preparation method of the first sheath material provided by the invention comprises the following steps:
adding linear low-density polyethylene, ethylene propylene diene monomer, maleic anhydride grafted vinyl acetate copolymer and chlorosulfonated polyethylene into an internal mixer according to parts by weight, internally mixing for 7min at the temperature of 150 ℃, naturally cooling and standing for 2h after internal mixing is finished, then adding an electromagnetic shielding agent, polyethylene wax and a cross-linking agent into the mixture, continuously mixing for 4min, finally adding an accelerator, mixing for 2min, extruding the mixture, cooling and granulating to obtain the required granular material for the first sheath.
Example 2
This example differs from example 1 in that:
the first sheath comprises the following raw material components in parts by mass: 45 parts of linear low-density polyethylene, 30 parts of ethylene propylene diene monomer, 8 parts of chlorosulfonated polyethylene, 30 parts of electromagnetic shielding agent, 7 parts of maleic anhydride grafted vinyl acetate copolymer, 4 parts of polyethylene wax, 3 parts of plasticizer and 2 parts of crosslinking agent.
Wherein, the plasticizer in the raw material components of the first sheath is diethyl phthalate, and the cross-linking agent is a mixture of di-tert-butyl peroxide and nano zinc oxide which are compounded according to a ratio of 5: 2.
The preparation method of the first sheath material provided by the embodiment is as follows:
adding linear low-density polyethylene, ethylene propylene diene monomer, maleic anhydride grafted vinyl acetate copolymer and chlorosulfonated polyethylene into an internal mixer according to parts by weight, carrying out internal mixing at the temperature of 170 ℃ for 8min, naturally cooling and standing for 3h after the internal mixing is finished, then adding an electromagnetic shielding agent, polyethylene wax and a crosslinking agent into the mixture, continuously mixing for 6min, finally adding an accelerator, mixing for 5min, extruding the mixture, cooling and granulating to obtain the required granular material for the first sheath.
Example 3
This example differs from example 1 in that:
the first sheath comprises the following raw material components in parts by mass: 37 parts of linear low-density polyethylene, 24 parts of ethylene propylene diene monomer, 5 parts of chlorosulfonated polyethylene, 18 parts of electromagnetic shielding agent, 6 parts of maleic anhydride grafted vinyl acetate copolymer, 3.5 parts of polyethylene wax, 2 parts of plasticizer and 1.5 parts of crosslinking agent.
Wherein, the plasticizer in the raw material components of the first sheath is dibutyl phthalate, and the cross-linking agent is a mixture of di-tert-butyl peroxide and nano zinc oxide which are compounded according to a ratio of 5: 2.
The preparation method of the first sheath material provided by the embodiment is as follows:
adding linear low-density polyethylene, ethylene propylene diene monomer, maleic anhydride grafted vinyl acetate copolymer and chlorosulfonated polyethylene into an internal mixer according to parts by weight, carrying out internal mixing at the temperature of 160 ℃ for 7.5min, naturally cooling and standing for 2.5h after the internal mixing is finished, then adding an electromagnetic shielding agent, polyethylene wax and a crosslinking agent into the mixture, continuing mixing for 5min, finally adding an accelerator, mixing for 3.5min, extruding the mixture, cooling and granulating to obtain the required granular material for the first sheath.
Performance testing
The test shows that the electromagnetic shielding rate of the shielded cable provided by the embodiment reaches more than 40dB, the anti-interference performance is very outstanding, and after more than 500 bending tests, the electromagnetic shielding rate of the bending part is still more than 90% of the original value. Correspondingly, after the bending test, the local electromagnetic shielding performance of the conventional shielded cable with the copper mesh or aluminum tape shielding layer is reduced by more than 50%, so that the conclusion can be drawn that the electromagnetic shielding performance of the shielded cable provided by the embodiment is very efficient and stable, the defects that the conventional shielded cable is not resistant to bending and deformation are overcome, and the conventional shielded cable has very outstanding performance.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The anti-interference high-strength cable for the central air conditioner is characterized by comprising a wire core, a fire-resistant buffer layer, a first shielding layer, a second shielding layer, a first sheath and a second sheath from inside to outside; the wire core comprises a limiting reinforcing rib with a quadrangular star-shaped cross section, wires with insulating layers are arranged on four arc-shaped edges of the limiting reinforcing rib, and the four wires comprise a power cable and a communication cable; the fireproof buffer layer is a dust-free asbestos tape wound on the outer layer of the wire core of the lead; the first shielding layer is a copper net wrapped on the surface of the dust-free asbestos tape, and a metal tin coating is plated on the surface of the copper net; the second shielding layer is an aluminum tape wound on the surface of the copper mesh; the first sheath is an insulating sheath filled with an electromagnetic shielding agent, and the second sheath is made of an oil-resistant corrosion-resistant PVC cable sheath material.
2. The disturbance-prevention high-strength cable for the central air conditioner as claimed in claim 1, wherein the first sheath comprises the following raw material components in parts by mass: 30-45 parts of linear low-density polyethylene, 20-30 parts of ethylene propylene diene monomer, 4-8 parts of chlorosulfonated polyethylene, 15-30 parts of electromagnetic shielding agent, 5-7 parts of maleic anhydride grafted vinyl acetate copolymer, 3-4 parts of polyethylene wax, 1-3 parts of plasticizer and 0.5-2 parts of cross-linking agent.
3. The disturbance-prevention high-strength cable for the central air conditioner as claimed in claim 1, wherein the first sheath comprises the following raw material components in parts by mass: 37 parts of linear low-density polyethylene, 24 parts of ethylene propylene diene monomer, 5 parts of chlorosulfonated polyethylene, 18 parts of electromagnetic shielding agent, 6 parts of maleic anhydride grafted vinyl acetate copolymer, 3.5 parts of polyethylene wax, 2 parts of plasticizer and 1.5 parts of crosslinking agent.
4. The disturbance-prevention high-strength cable for the central air conditioner as claimed in claim 1 or 2, wherein: the preparation method of the electromagnetic shielding agent comprises the following steps:
(1) uniformly ball-milling and mixing zinc powder, copper powder and iron-nickel alloy micro powder according to the mass ratio of 3:7:15, then blowing the mixed metal powder into a combustor, combusting the mixed metal powder in the combustor by using reducing gas, melting and evaporating the mixed metal micro powder, forming rotational flow in a combustion chamber of the combustor by using inert gas, spraying the metal into a cooling chamber filled with the inert gas by using an injector, and cooling to form spherical metal micro powder;
(2) grading the metal micro powder, selecting the metal micro powder with the particle size of 20-120nm, and forming a chromium coating on the surface of the metal micro powder by utilizing a chemical plating process; the thickness of the chromium coating in the obtained coating metal microsphere is 12-20% of the mass of the metal micro powder;
(3) mixing the plating layer metal microspheres and the nano graphene according to a mass ratio of 3:1, adding the mixture into a xylene solvent with the volume of 8-10 times, then dropwise adding 1.0-3.5 wt% of diethanolamine and 0.6-1.5 wt% of nonionic surfactant into the solvent, and performing ultrasonic dispersion treatment for 1-1.5h to obtain a dispersion liquid;
(4) and adding polyvinyl acetate resin accounting for 40-60% of the mass of the coated metal microspheres into the dispersion liquid in the previous step, heating to 115-130 ℃, stirring at the rotating speed of 450-600r/min for 3-5h to obtain a mixed solution, and performing spray drying and granulation on the mixed solution to obtain the required electromagnetic shielding agent.
5. The disturbance-prevention high-strength cable for the central air conditioner as claimed in claim 4, wherein: the content of nickel element in the iron-nickel alloy in the step (1) is 70-85%.
6. The disturbance-prevention high-strength cable for the central air conditioner as claimed in claim 4, wherein: the reducing gas in the step (1) is one or a mixture of hydrogen and carbon monoxide.
7. The disturbance-prevention high-strength cable for the central air conditioner as claimed in claim 4, wherein: and (3) selecting spheroidized graphene micro powder with the particle size of 150-300nm from the nano graphene in the step (3).
8. The disturbance-prevention high-strength cable for the central air conditioner as claimed in claim 4, wherein: and (3) the surfactant in the step (3) is nonylphenol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether or isooctyl polyoxyethylene ether.
9. The disturbance-prevention high-strength cable for the central air conditioner as claimed in claim 2, wherein: the plasticizer is one of phthalate plasticizers, and the cross-linking agent is a mixture of di-tert-butyl peroxide and nano zinc oxide compounded according to a ratio of 5: 2.
10. The disturbance-prevention high-strength cable for the central air conditioner as claimed in claim 2, wherein the first sheath material is prepared by the following method:
adding linear low-density polyethylene, ethylene propylene diene monomer, maleic anhydride grafted vinyl acetate copolymer and chlorosulfonated polyethylene into an internal mixer according to parts by weight, internally mixing at the temperature of 150-170 ℃ for 7-8min, naturally cooling and standing for 2-3h after internal mixing is completed, then adding an electromagnetic shielding agent, polyethylene wax and a cross-linking agent into the mixture, continuously mixing for 4-6min, finally adding an accelerator, mixing for 2-5min, extruding the mixture, cooling and granulating to obtain the required granular material for the first sheath.
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| CN202010646734.2A CN111933332A (en) | 2020-07-07 | 2020-07-07 | Interference-preventing high-strength cable for central air conditioner |
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| CN202010646734.2A CN111933332A (en) | 2020-07-07 | 2020-07-07 | Interference-preventing high-strength cable for central air conditioner |
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| CN (1) | CN111933332A (en) |
Cited By (1)
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| CN114597002A (en) * | 2022-03-04 | 2022-06-07 | 广东新亚光电缆股份有限公司 | 485 line cable preparation method |
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| CN111210934A (en) * | 2020-01-22 | 2020-05-29 | 浙江元通线缆制造有限公司 | Tensile type fireproof flame-retardant cable |
| CN210667882U (en) * | 2019-11-13 | 2020-06-02 | 广东广深电缆有限公司 | Flame-retardant shielded cable |
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| US20200168366A1 (en) * | 2016-11-28 | 2020-05-28 | Autonetworks Technologies, Ltd. | Shielded communication cable |
| CN109585074A (en) * | 2018-11-02 | 2019-04-05 | 江苏亨通电子线缆科技有限公司 | A kind of high-elastic resistance to voltage cable of new-energy automobile highly-flexible |
| CN109608748A (en) * | 2018-11-15 | 2019-04-12 | 合肥天沃能源科技有限公司 | A kind of high-tension shielding cable of uniform and stable resistance to breakdown |
| CN210667882U (en) * | 2019-11-13 | 2020-06-02 | 广东广深电缆有限公司 | Flame-retardant shielded cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114597002A (en) * | 2022-03-04 | 2022-06-07 | 广东新亚光电缆股份有限公司 | 485 line cable preparation method |
| CN114597002B (en) * | 2022-03-04 | 2024-04-05 | 广东新亚光电缆股份有限公司 | 485 line cable preparation method |
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Application publication date: 20201113 |