CN114420348A - Aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus and preparation method thereof - Google Patents
Aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus and preparation method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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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
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
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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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/2806—Protection against damage caused by corrosion
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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
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
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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 provides an aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus and a preparation method thereof. The cable comprises a shielding twisted pair group, a second filling core, a second wrapping shielding layer, a braided shielding layer and an outer protective layer; the aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus has low relative dielectric constant and low density micropore raw material belt insulation twisted pair wires, wrapping split screens, a total screen structure wrapping and weaving double-shielding structure, has light weight, small structural size and excellent composite shielding efficiency, effectively reduces the crosstalk interference between the wire pairs, has strong capacity of resisting external signals and electromagnetic field interference, can effectively improve the transmission performance of the cable, has the use frequency of 1 MHz-1250 MHz, has the use temperature of-65 ℃ to +200 ℃, has the capacity of inhibiting common mode interference, resists flame and high and low temperature, meets the requirements of various environmental properties such as moisture resistance, corrosion resistance, mildew resistance and the like, and has good flexibility.
Description
Technical Field
The invention relates to the technical field of communication cables, in particular to an aviation ultrahigh frequency low-loss high-temperature and low-temperature resistant high-speed data bus and a preparation method thereof.
Background
Aviation refers to the navigational activity of manned or unmanned aircraft in the earth's atmosphere; space flight refers to the navigation of manned or unmanned spacecraft outside the earth's atmosphere, also known as space flight or space navigation, and human beings inevitably need to develop new activity space in order to expand social production
In recent years, with the leap development of data communication networks, 5G promotes the integration of mobile networks and fixed network technologies and the integration requirement of computing and communication capacity, the requirement on high-frequency low-loss high-speed data buses with higher electromagnetic interference resistance and confidentiality is increased day by day, and the requirement of a new generation of aerospace high-speed transmission systems is different from that of traditional civil data cables or bus cables.
At present, the equivalent product structures of six types of wires, seven types of wires, DVI (digital video interface) data wires and HDMI (high-definition multimedia interface) high-definition data wires on the market mainly comprise a single bare copper conductor, high-density polyethylene insulation and a polyvinyl chloride sheath, the highest use frequency is different from 250MHz to 680MHz, the use temperature is-20 to +70 ℃, and the requirements of a new generation of high-speed transmission system for aerospace cannot be met, such as the use frequency is 1-1250 MHz, the use temperature is-65 to +200 ℃, the ultrahigh speed is ultrahigh, the high and low temperature resistance, the humidity resistance, the mildew resistance, the flexibility and other performance requirements.
Therefore, it is necessary to provide an aviation ultrahigh frequency, low loss, high temperature and low temperature resistant high speed data bus and a preparation method thereof to solve the above technical problems.
Disclosure of Invention
The invention provides an aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus and a preparation method thereof, and solves the problem that the existing cable cannot meet the use requirement of an aerospace high-speed data transmission system.
In order to solve the technical problems, the aviation ultrahigh frequency low-loss high-temperature and low-temperature resistant high-speed data bus provided by the invention comprises: the shielding twisted pair group, the second filling core, the second wrapping shielding layer, the braided shielding layer and the outer protective layer are arranged on the outer surface of the outer sheath; the shielding twisted pair group and the second filling cores are twisted to form a multi-core cable, the second wrapping shielding layer covers the surface of the multi-core cable, the braided shielding layer covers the surface of the second wrapping shielding layer, and the outer protective layer covers the surface of the braided shielding layer.
Preferably, the shielding twisted-pair group comprises a conductor, a twisted-pair group core wire insulating layer, a first filling core and a first wrapping shielding layer; the twisted pair group core wire insulating layer is coated on the surface of the conductor to form twisted pair group insulating core wires, the twisted pair group insulating core wires and the filling cores are twisted in a twisted pair mode to form a twisted pair group, the first wrapped shielding layer is coated on the surface of the twisted pair group, and the twisted pair group core wire insulating layer is made of a high-temperature-resistant 400 ℃ low-dielectric-constant low-density micropore raw material belt.
Preferably, the first lapping shielding layer is made of a high-temperature aluminum-plastic composite tape by lapping, and is used for shielding external signal interference.
Preferably, the first filling core is made of a low-density micropore raw material belt in a wrapping mode, the pair-twisted group core wire insulating layer is made of an ultra-low-density micropore raw material belt, the pair-twisted group core wire insulating layer is used for improving the transmission capacity of the cable, and the second filling core is made of a low-density micropore raw material belt.
Preferably, the pitch of the outer diameter of the twisted pair group after being twisted is 10-15 times when the twisted pair group is twisted.
Preferably, the second filling core is formed by lapping a low-density micropore raw material belt; the second lapping shielding layer is made by sampling and lapping a high-temperature aluminum-plastic composite tape; the braided shielding layer is braided by silver-plated copper wires, and the braiding density is greater than 90%; the outer protective layer is made of high-elasticity fluorine material.
A preparation method of an aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus comprises the following steps:
s1: providing a conductor, and winding a twisted pair core wire insulating layer on the outer side of the conductor by using a low-dielectric-constant low-density raw material belt to form a twisted pair group core wire; the low-dielectric-constant and low-density raw material belt is wrapped to form a first filling core, and a first shielding layer is wrapped to form a shielding twisted group after the core wires of the two twisted groups and the two filling cores are twisted in pairs.
S2: providing a low-dielectric-constant and low-density raw material belt, and wrapping the low-dielectric-constant and low-density raw material belt to form a second filling core;
s3: and twisting the shielding pair-twisting groups and the filling cores to form a multi-core cable, wrapping a second wrapping shielding layer after twisting, wrapping the second wrapping shielding layer with the braided shielding layer, and finally extruding the outer protective layer to obtain the high-frequency low-loss high-temperature low-temperature high-speed data bus for aerospace.
Preferably, the shielding twisted pair group insulation core wire is prepared by the following steps:
b1: selecting a part of conductors, and cleaning the conductors before lapping;
b2: and winding the low-dielectric-constant and low-density raw material tape around the conductor for multiple times at a proper wrapping angle, a proper wrapping pitch and a proper wrapping tension, and coating the conductor with the low-dielectric-constant and low-density raw material tape.
Preferably, the first and second filled cores are prepared by:
c1: cleaning the low-dielectric-constant and low-density raw material belt before wrapping;
c2: and assembling the low-density micropore thread seal tape on a lapping machine, and rotating at high speed for hanging winding at a certain lapping pitch and lapping angle.
Preferably, the lapping pitch in the step C2 is 1.5mm to 3.0mm, the lapping angle in the step C2 is 20 degrees to 40 degrees, the lapping tension in the step C2 is 2.5N, the lapping angle in the step B2 is 20 degrees to 26 degrees, the lapping pitch in the step B2 is 1.0mm to 4.0mm, the lapping tension in the step B2 is 2.0 to 5N, the lapping rate in the step B2 is 50% to 95%, and the conductor is made by twisting metal wires after being subjected to wire drawing and annealing and then being plated with metal on the surface.
Compared with the related technology, the aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus and the preparation method thereof provided by the invention have the following beneficial effects:
the invention provides an aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus and a preparation method thereof, the aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus has a low-density micropore raw material belt insulation twisted pair wire with a low relative dielectric constant, a wrapping split screen, a total screen structure wrapping and weaving double-shielding structure, has light weight, small structural size and excellent composite shielding efficiency, effectively reduces the crosstalk interference between wire pairs, has strong external signal and electromagnetic field interference resistance, can effectively improve the transmission performance of a cable, has the use frequency of 1 MHz-1250 MHz, has the use temperature of-65 ℃ to +200 ℃, has the capability of inhibiting common mode interference, resists flame and high and low temperature, meets the requirements of various environmental performance such as moisture resistance, corrosion resistance, mildew resistance and the like, and has good flexibility.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an aviation ultrahigh frequency, low loss, high and low temperature resistant high speed data bus provided by the invention;
fig. 2 is a process flow diagram of an embodiment of the preparation method of the aviation ultrahigh frequency low-loss high-temperature and low-temperature resistant high-speed data bus provided by the invention.
Reference numbers in the figures: 1. shielding pair twist group, 11, conductor, 12, pair twist group core wire insulating layer, 13, first filler core, 14, first package shielding layer, 2, second filler core, 3, second package shielding layer, 4, weave shielding layer, 5, outer jacket.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
Please refer to fig. 1 and fig. 2 in combination, wherein fig. 1 is a schematic structural diagram of an embodiment of an aviation ultrahigh frequency low-loss high/low temperature resistant high-speed data bus provided by the present invention; fig. 2 is a process flow diagram of an embodiment of the preparation method of the aviation ultrahigh frequency low-loss high-temperature and low-temperature resistant high-speed data bus provided by the invention. An aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus comprises: the cable comprises a shielding twisted pair group 1, a second filling core 2, a second wrapping shielding layer 3, a braided shielding layer 4 and an outer protective layer 5; the shielding twisted pair group 1 and the second filling cores 2 are twisted to form a multi-core cable, the second wrapping shielding layer 3 is coated on the surface of the multi-core cable, the braided shielding layer 4 is coated on the surface of the second wrapping shielding layer 3, and the outer protective layer 5 is coated on the surface of the braided shielding layer 4.
The shielding twisted-pair group 1 comprises a conductor 11, a twisted-pair group core wire insulating layer 12, a first filling core 13 and a first wrapping shielding layer 14; the twisted pair group core wire insulating layer 12 is coated on the surface of the conductor 11 to form a twisted pair group insulating core wire, the twisted pair group insulating core wire and the filling cores 13 are twisted in a twisted pair to form a twisted pair group, the first wrapping shielding layer 14 is coated on the surface of the twisted pair group, and the twisted pair group core wire insulating layer 12 is made of a high-temperature-resistant 400 ℃ low-dielectric-constant low-density micropore raw material belt.
The conductor 11 is a silver-plated copper alloy conductor, the material should meet the specification of GJB1640-1993, the cross section range of the conductor 11 is 0.08-3.0 mm2, the conductor has excellent conductivity, the tensile strength of the silver-plated copper alloy conductor is integrally higher than that of the silver-plated conductor, and the welding performance is good; meanwhile, the silver has high chemical stability, and has excellent acid and alkali corrosion resistance, flame resistance and aging resistance
The twisted pair core wire insulating layer 12 is made of a high-temperature-resistant 400 ℃ low-dielectric-constant low-density micropore raw material belt, has ultralow relative dielectric constant and dielectric loss angle tangent value, can effectively reduce the equivalent dielectric constant of insulation within a proper processing parameter range, reduces the attenuation of signals during cable transmission, greatly reduces the size of a product, improves the flexibility, high-low temperature resistance and electrical performance of the product.
First around package shielding layer 14 adopts the compound area of high temperature plastic-aluminum to make around the package to first package shielding layer 14 is used for shielding external signal interference.
The performance of the aluminum-plastic composite tape wrapping meets the requirements of YB/T723-2007 technical plastic composite tapes for communication cables and optical cables, can effectively shield external signal interference, and can resist high temperature of 400 ℃.
The first filling core 13 is made of a low-density micropore raw material belt in a wrapping mode, the pair-twisted group core wire insulating layer 12 is made of an ultra-low density micropore raw material belt, the pair-twisted group core wire insulating layer 12 is used for improving the transmission capacity of a cable, and the second filling core 2 is made of a low-density micropore raw material belt.
The pair-twisted group core wire insulating layer 12 adopts an ultra-low density micropore raw material belt, has ultra-low relative dielectric constant and dielectric loss angle tangent value, has the functions of reducing attenuation, improving cable transmission capacity, effectively reducing the size and weight of a cable structure, and has the advantages of good appearance, low apparent density, high tensile strength and small volatilization decrement.
And when the pair twisting group is twisted in pair, the pitch of the outer diameter after the pair twisting is 10-15 times selected.
The pitch of the outer diameter after 10-15 times of pair twisting is selected to effectively reduce the attenuation and the crosstalk interference between the wire pairs.
The second filling core 2 is formed by wrapping a low-density micropore raw material belt; the second lapping shielding layer 3 is made by lapping a high-temperature aluminum-plastic composite tape; the braided shielding layer 4 is braided by silver-plated copper wires, and the braiding density is more than 90%; the outer protective layer 5 is made of high-elasticity fluorine material.
The first filling core 13 and the second filling core 2 are low-density micropore raw material belts which are high in flexibility and ductility, good in corrosion resistance and high temperature resistance and small in surface smooth friction coefficient.
The silver-plated copper wire has excellent oxidation resistance and is not easy to oxidize, and the double-layer composite shielding structure can effectively improve the anti-interference capability of the cable.
The outer protective layer 5 is made of high-elasticity fluorine material, is easy to form and process, has excellent wear resistance, heat resistance and stress cracking resistance, good mechanical property, flame retardance, mildew resistance and weather resistance,
a preparation method of an aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus comprises the following steps:
s1: providing a conductor 11, and winding a low-dielectric-constant low-density raw material belt on the outer side of the conductor by a twisted-pair core wire insulating layer 12 to form a twisted-pair group core wire; the low-dielectric-constant and low-density raw material belt is provided, the low-dielectric-constant and low-density raw material belt is wrapped to form a first filling core 13, and a first shielding layer 14 is wrapped to form a shielding twisted group after the core wires of the two twisted groups are twisted with the two filling cores in a twisted pair mode.
S2: providing a low-dielectric-constant and low-density raw material belt, and wrapping the low-dielectric-constant and low-density raw material belt to form a second filling core 2;
s3: and twisting the shielding pair-twisting groups 1 and the filling cores 2 to form a multi-core cable, wrapping a second wrapping shielding layer 3 after twisting, wrapping a braided shielding layer 4, and finally extruding an outer protective layer 5 to obtain the high-frequency low-loss high-temperature and low-temperature resistant high-speed data bus for aerospace.
The shielding twisted pair group insulation core wire 12 is prepared by the following steps:
b1: selecting a part of conductor 11, and cleaning the conductor 11 before lapping;
b2: and winding the low-dielectric-constant and low-density raw material tape around the conductor for multiple times at a proper wrapping angle, a proper wrapping pitch and a proper wrapping tension, and coating the conductor with the low-dielectric-constant and low-density raw material tape.
After processing, the equivalent dielectric constant of insulation can be greatly reduced, so that the attenuation of signals during cable transmission is reduced, the size of a product is greatly reduced, and the flexibility, high and low temperature resistance and electrical property of the product are improved.
The first and second filled cores 13, 2 are prepared by the steps of:
c1: cleaning the low-dielectric-constant and low-density raw material belt before wrapping;
c2: and assembling the low-density micropore thread seal tape on a lapping machine, and rotating at high speed for hanging winding at a certain lapping pitch and lapping angle.
The lapping pitch in the step C2 is 1.5mm-3.0mm, the lapping angle in the step C2 is 20 degrees-40 degrees, the lapping tension in the step C2 is 2.5N, the lapping angle in the step B2 is 20 degrees-26 degrees, the lapping pitch in the step B2 is 1.0 mm-4.0 mm, the lapping tension in the step B2 is 2.0-5N, the lapping rate in the step B2 is 50% -95%, and the conductor 11 is made by twisting metal wires after being subjected to wire drawing and annealing and then being plated with metal on the surface.
Based on the preparation method of the aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus, different preparation parameters are taken to prepare the aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus, which is specifically shown in table 1.
TABLE 1
As can be seen from the above table:
(1) the impedance and attenuation values of the cables obtained in the embodiments 1-3 are obviously superior to those of the comparative example 1, and the reason is that the comparative example 1 does not adopt the low-loss low-density micropore thread seal tape as the insulating layer and the filling core of the twisted pair group insulating core wire, meanwhile, the lapping rate is too low, the lapping angle is too high, because the dielectric constant and the dielectric loss tangent value of the low-loss low-density micropore thread seal tape insulation are lower than those of the thread seal tape insulation, the low-loss low-density micropore thread seal tape is adopted as the twisted pair group core wire insulating layer, the equivalent dielectric constant of the insulation can be reduced, the impedance value is greatly improved, and the attenuation value is reduced.
(2) And compared with the embodiment 1-3, the comparative example 2 has larger attenuation, and the reason is that the winding tension in the comparative example 2 is too large, so that the outer diameter fluctuation of the insulating core wire is too large, and the twisted pitch is large, so that the whole structure of the cable core is unstable, and the attenuation value is too large.
Therefore, the low-loss low-density micropore thread seal tape is used as a core wire insulating layer and a filling core of the insulating core wire of the pair-twisting group, the wrapping pitch is 1.0-4.0 mm, the wrapping angle is 20-50 degrees, the wrapping tension is 2.0-4.5N, the overlapping rate is 80% -95%, and the pitch of the outer diameter of the pair-twisting group after 10-15 times of pair twisting is selected during pair twisting of the pair-twisting group, so that the aviation ultrahigh-frequency low-loss high-temperature and low-temperature resistant high-speed data bus capable of meeting the performance index requirements can be obtained.
Compared with the related technology, the aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus and the preparation method thereof provided by the invention have the following beneficial effects:
the aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus has low relative dielectric constant low-density micropore raw material belt insulation twisted pair wires, wrapping split screens and a total screen structure wrapping and weaving double-shielding structure, has light weight, small structural size and excellent composite shielding efficiency, effectively reduces the interference of crosstalk between wire pairs, has strong external signal and electromagnetic field interference resistance, can effectively improve the transmission performance of a cable, has the use frequency of 1 MHz-1250 MHz and the use temperature of-65 ℃ to +200 ℃, has the capability of inhibiting common mode interference, resists flame and high and low temperature, meets various environmental performance requirements of moisture resistance, corrosion resistance, mildew resistance and the like, and has good flexibility.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides an aviation hyperfrequency low loss is able to bear or endure high low temperature high speed data bus which characterized in that includes:
the shielding twisted pair group, the second filling core, the second wrapping shielding layer, the braided shielding layer and the outer protective layer are arranged on the outer surface of the outer sheath;
the shielding twisted pair group and the second filling cores are twisted to form a multi-core cable, the second wrapping shielding layer covers the surface of the multi-core cable, the braided shielding layer covers the surface of the second wrapping shielding layer, and the outer protective layer covers the surface of the braided shielding layer.
2. The aviation ultrahigh frequency low loss high and low temperature resistant high speed data bus of claim 1, wherein the shielding twisted pair group comprises a conductor, a twisted pair group core wire insulating layer, a first filling core, a first wrapping shielding layer;
the twisted pair group core wire insulating layer is coated on the surface of the conductor to form twisted pair group insulating core wires, the twisted pair group insulating core wires and the filling cores are twisted in a twisted pair mode to form a twisted pair group, the first wrapped shielding layer is coated on the surface of the twisted pair group, and the twisted pair group core wire insulating layer is made of a high-temperature-resistant 400 ℃ low-dielectric-constant low-density micropore raw material belt.
3. The aviation ultrahigh frequency low-loss high and low temperature resistant high-speed data bus according to claim 2, wherein the first wrapped shielding layer is made of a high-temperature aluminum-plastic composite tape by wrapping, and the first wrapped shielding layer is used for shielding external signal interference.
4. The aviation ultrahigh frequency low-loss high and low temperature resistant high-speed data bus of claim 2, wherein the first filling core is made of a low-density microporous raw material belt in a wrapping mode, the twisted pair group core wire insulating layer is made of an ultralow-density microporous raw material belt, the twisted pair group core wire insulating layer is used for improving the cable transmission capacity, and the second filling core is made of a low-density microporous raw material belt.
5. The aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus according to claim 2, wherein the twist set selects a pitch of 10-15 times of the outer diameter after twist when twisting.
6. The aviation ultrahigh frequency low-loss high-low temperature and high-speed data bus as claimed in claim 1, wherein the second filler core is made of a low-density microporous raw material tape by wrapping; the second lapping shielding layer is made by sampling and lapping a high-temperature aluminum-plastic composite tape; the braided shielding layer is braided by silver-plated copper wires, and the braiding density is greater than 90%; the outer protective layer is made of high-elasticity fluorine material.
7. A preparation method of an aviation ultrahigh frequency low-loss high-low temperature resistant high-speed data bus is characterized by comprising the following steps:
s1: providing a conductor, and winding a twisted pair core wire insulating layer on the outer side of the conductor by using a low-dielectric-constant low-density raw material belt to form a twisted pair group core wire; the low-dielectric-constant and low-density raw material belt is wrapped to form a first filling core, and a first shielding layer is wrapped to form a shielding twisted group after the core wires of the two twisted groups and the two filling cores are twisted in pairs.
S2: providing a low-dielectric-constant and low-density raw material belt, and wrapping the low-dielectric-constant and low-density raw material belt to form a second filling core;
s3: and twisting the shielding pair-twisting groups and the filling cores to form a multi-core cable, wrapping a second wrapping shielding layer after twisting, wrapping the second wrapping shielding layer with the braided shielding layer, and finally extruding the outer protective layer to obtain the high-frequency low-loss high-temperature low-temperature high-speed data bus for aerospace.
8. The method for preparing the aviation ultrahigh frequency, low loss, high and low temperature resistant and high speed data bus according to claim 7, wherein the shielding twisted pair group insulation core wire is prepared by the following steps:
b1: selecting a part of conductors, and cleaning the conductors before lapping;
b2: and winding the low-dielectric-constant and low-density raw material tape around the conductor for multiple times at a proper wrapping angle, a proper wrapping pitch and a proper wrapping tension, and coating the conductor with the low-dielectric-constant and low-density raw material tape.
9. The method for preparing the aviation ultrahigh frequency, low loss, high and low temperature resistant and high speed data bus according to claim 7, wherein the first and second filler cores are prepared by the following steps:
c1: cleaning the low-dielectric-constant and low-density raw material belt before wrapping;
c2: and assembling the low-density micropore thread seal tape on a lapping machine, and rotating at high speed for hanging winding at a certain lapping pitch and lapping angle.
10. The method for preparing the aviation ultrahigh-frequency low-loss high-low temperature resistant high-speed data bus according to claim 9, wherein the lapping pitch in the C2 step is 1.5mm-3.0mm, the lapping angle in the C2 step is 20 degrees-40 degrees, the lapping tension in the C2 step is 2.5N, the lapping angle in the B2 step is 20 degrees-26 degrees, the lapping pitch in the B2 step is 1.0 mm-4.0 mm, the lapping tension in the B2 step is 2.0-5N, the lapping rate in the B2 step is 50% -95%, and the conductor is made by stranding metal wires after being subjected to wire drawing and annealing and surface coating metal.
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| CN117236164A (en) * | 2023-09-06 | 2023-12-15 | 成都国恒空间技术工程股份有限公司 | BP neural network, 1394 cable wrapping method, system and sintering method |
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