CN115862961A - Transmission cable with adjustable impedance and capable of being assembled quickly and manufacturing method - Google Patents
Transmission cable with adjustable impedance and capable of being assembled quickly and manufacturing method Download PDFInfo
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- CN115862961A CN115862961A CN202310173723.0A CN202310173723A CN115862961A CN 115862961 A CN115862961 A CN 115862961A CN 202310173723 A CN202310173723 A CN 202310173723A CN 115862961 A CN115862961 A CN 115862961A
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Abstract
A fast assembly impedance adjustable transmission cable and its preparation method, the cable sleeve composed of insulating layer, inner sheath, shielding layer and oversheath, cut into the short-line sleeve of 0.5 meters to 1.2 meters; calculating the diameter of a conductor core of the cable by using a derivation formula of characteristic impedance under high frequency according to the impedance value of an electrical element; penetrating conductor wire cores with required diameters into a plurality of internal tooth support frames for fixing; and a plurality of conductor wire cores with internal tooth support frames are sleeved and penetrate into the short-wire sleeve, and then the end sockets at the two ends form a transmission cable. The conductor wire core has the characteristic of being replaceable, finished cables with different sections do not need to be stored, only conductors with different diameters need to be stored, and the inner conductor wire core is replaced when the cable core is used.
Description
Technical Field
The patent relates to the field of signal transmission cables, in particular to a transmission cable with adjustable rapid assembly impedance and a manufacturing method thereof.
Background
Impedance refers to the resistance effect on the current in a circuit with resistance, inductance and capacitance, and is one of the important parameters of cable transmission. The impedance matching is mainly used on a transmission line, so that the aim of transmitting all high-frequency microwave signals to a load point is fulfilled, power transmission is maximized, signal reflection at a target equipment end is minimized, and the signal transmission efficiency is improved. When signals are transmitted between high-precision equipment and electrical components, the requirement on the characteristic impedance of a transmission cable is high, and when the characteristic impedance in the transmission cable is inconsistent with the output impedance in the high-precision equipment, wave reflection is formed, so that part of the signals are reflected back to a source point, and signal loss is caused; high-precision devices are equipped with impedance transformers for measuring the different electrical components to adjust their output impedance, while the characteristic impedance inside the transmission cable, which functions as a high-precision device in connection with the electrical components, determines whether maximum power transmission can be achieved.
In traditional transmission cable, closely fixed between each structure of cable, undetachable, if want to be surveyed the output impedance of component matching high accuracy equipment to the difference, reach maximum power transmission, need change different transmission cable, this cable product that just needs each specification of deposit facilitates the use, has not only increased material cost and cost of labor, has caused the limitation to the use of high accuracy equipment appearance moreover. For example, the high performance transmission coaxial cable with patent number CN204189513U has a fixed structure, and can achieve maximum power transmission only when the output impedance reaches a specific value, and if the output impedance changes, the cable with corresponding specification needs to be replaced.
Disclosure of Invention
In view of the problem that the characteristic impedance of a transmission cable is not matched with the characteristic impedance of an electrical element to reduce the signal transmission efficiency or the problem that the transmission cables of different specifications need to be replaced to reach the maximum transmission power to cause cost waste and long replacement period, the invention provides a transmission cable with adjustable impedance and a manufacturing method thereof. The conductor wire core, the support frame and the insulating layer are movable, the support frame and the insulating layer are used as a transmission cable for measuring electrical components of high-precision equipment, and the inner conductor of the cable can be quickly replaced within the length of 0.5-1.2 meters to adjust the characteristic impedance of the cable, so that the impedance of the electrical components and the output impedance of the high-precision equipment are adapted, the transmission cable can be adapted to the characteristic impedance of the electrical components to achieve the maximum transmission efficiency, the production cost of the cable is reduced, and the resource waste is avoided.
In order to achieve the purpose, the technical scheme is as follows: a method for manufacturing a transmission cable with adjustable rapid assembly impedance comprises the following steps:
the first step is as follows: cutting a cable sleeve consisting of an insulating layer, an inner sheath, a shielding layer and an outer sheath into a 0.5-1.2 m short-line sleeve;
the second step is that: calculating the diameter of a wire core of a cable conductor by using a derivation formula of characteristic impedance under high frequency according to the impedance value of an electrical element;
the third step: penetrating conductor wire cores with required diameters into a plurality of internal tooth support frames for fixing;
the fourth step: and the whole conductor core sleeved with the plurality of internal tooth supporting frames penetrates into the short-wire sleeve, and then the end sockets at the two ends form the transmission cable.
A transmission cable with adjustable fast assembly impedance comprises a conductor wire core, an insulating layer, an inner sheath, a shielding layer, an outer sheath and a support frame, wherein the support frame is a support frame with internal teeth;
a plurality of internal tooth supporting frames are arranged at intervals outside the conductor wire core, an insulating layer, an inner sheath, a shielding layer and an outer sheath are sequentially arranged outside the plurality of internal tooth supporting frames, the conductor wire core is in interference fit with the plurality of internal tooth supporting frames, and the plurality of internal tooth supporting frames are in clearance fit with the insulating layer; and a plurality of teeth are uniformly arranged on the inner diameter of the middle hole I of the support frame with the inner teeth.
The beneficial effect of this patent is: in the prior art, transmission cables need to be designed and produced according to different output impedances of equipment, the cost is increased when the cables with different sections are stored, but if the cables are not stored, the cables with the corresponding sections cannot be replaced in time to achieve the maximum transmission power for measurement. The conductor wire core has the characteristic of being replaceable, finished cables with different sections do not need to be stored, only conductors with different diameters need to be stored, and the inner conductor wire core is replaced when the cable core is used.
The support frame with the inner teeth or the annular support frame is made of nylon 66 materials, has good mechanical performance, excellent flexibility and excellent self-lubricating property, can be fixedly grabbed on a conductor wire core through the structural design of a plurality of teeth of the support frame with the inner teeth, positions the conductor wire core at the center of a short sleeve of the cable, and guarantees the stability of the electrical performance of the cable.
The annular support frame can be fastened on the conductor wire core through the structural design of the middle hole II, and the conductor wire core is positioned at the center of the short-line sleeve of the cable, so that the stability of the electrical performance of the cable is ensured.
The conductor wire core adopts any solid single silver-plated copper conductor within the range of 0.5 mm-1.5 mm. The characteristic impedance of the cable itself can be adjusted in the range of 96 Ω -151 Ω to match the output impedance in high precision equipment and prevent some waves in the cable from reflecting from the cable mismatch and causing signal loss.
The conductor core adopts a solid single silver-plated copper conductor which has excellent electrical conductivity, thermal conductivity, corrosion resistance and high-temperature oxidation resistance, the diameter of the conductor core can be adjusted within the range of 0.5 mm-1.5 mm according to the output impedance of high-precision equipment, conductors of different specifications can be used for achieving required impedance values so as to match the output impedance of the high-precision equipment, and partial waves in cable transmission can be prevented from being reflected from a cable mismatch part to cause signal loss.
The insulating layer adopts the polypropylene material to design into tubular structure, and polypropylene material hardness is higher, and the structure is regular, and chemical stability is good, and insulating properties is good under the high frequency, can guarantee that the cable does not take place extrusion deformation and accurate transmission signal under receiving external pressure, and tubular structure can make things convenient for the change of inner conductor.
The inner protection layer is made of foamed polyethylene material, has the characteristics of light weight, good heat insulation, strong anti-interference performance, low dielectric constant and the like, ensures reliable signal transmission, and can ensure the reliable signal transmission in a longer distance.
The shielding layer is made of a woven silver-plated copper material, so that external electromagnetic interference can be reduced.
The sheath layer is made of flame-retardant polyvinyl chloride material, and has good physical and mechanical properties, flame retardance and good processability.
Drawings
FIG. 1 is a view showing the construction of a transmission cable equipped with a support frame with internal teeth according to the present invention;
FIG. 2 is a schematic structural view of the internal gear support frame of the present invention;
FIG. 3 is a view of the construction of a transmission cable incorporating the annular support frame of the present invention;
FIG. 4 is a schematic structural diagram of the annular bracing frame of the present invention.
Detailed Description
As shown in fig. 1 and 2, a transmission cable with adjustable fast assembly and impedance comprises a conductor core 1, an insulating layer 2, an inner sheath 3, a shielding layer 4, an outer sheath 5 and a support frame, wherein the support frame is an internal tooth support frame 6.
Extrude tubulose insulating layer 2 of fixed aperture and external diameter, insulating layer 2 is the insulating layer of hollow hole, extrude the inner sheath 3 of foaming outside insulating layer 2, weave shielding layer 4 outside inner sheath 3, extrude outer sheath 5 outside shielding layer 4 and constitute cable sleeve, in the hollow hole that can penetrate tubulose insulating layer 2 for guaranteeing conductor sinle silk 1 and in-band tooth support frame 6, cut into 0.5 meter to 1.2 meters stub sleeve spare according to service environment with cable sleeve. Before selecting conductor sinle silk 1, set for the output impedance value of high accuracy equipment according to the difference of electrical components under test, use computational formula to calculate required conductor sinle silk diameter, then at the conductor sinle silk 1 overcoat that calculates gained a plurality of internal tooth support frames 6, a plurality of internal tooth support frames 6 are through respective several tooth 6-2 and conductor sinle silk 1 interference fit, fix on conductor sinle silk 1, will fix the conductor sinle silk 1 whole of internal tooth support frame 6 well again, penetrate stub sleeve pipe back both ends head with the manual work and constitute transmission cable.
As shown in figure 2, the supporting frame 6 with the internal teeth is a circular body, a plurality of teeth 6-2 are uniformly arranged along the periphery of the inner diameter of a central hole I6-1 of the circular body, and the inner diameter of the central hole I6-1 is two sizes of 0.5mm or 1.0mm for better fixing a conductor wire core 1. Wherein the supporting frame 6 with the internal teeth and the internal diameter of 0.5mm can fix the conductor wire core 1 within the range of 0.5 mm-1.0 mm, and the supporting frame 6 with the internal teeth and the internal diameter of 1.0mm can fix the conductor wire core 1 within the range of 1.0 mm-1.5 mm. The outer diameter of the support frame 6 with the internal teeth is 1.66 mm-1.68 mm, and the support frame is in clearance fit with the hollow hole of the insulating layer 2, can penetrate into the hollow hole of the insulating layer 2 and is easy to pull out.
The conductor wire core 1 adopts a solid single silver-plated copper conductor with any diameter within the range of 0.5 mm-1.5 mm. The characteristic impedance of the transmission cable itself can be adjusted to match the output impedance of the high-precision equipment, and partial waves in the cable can be prevented from being reflected from the mismatch of the cable, so that signal loss is avoided.
The insulating layer 2 is a tubular insulating layer made of polypropylene material; the inner sheath 3 is an inner sheath made of foamed polyethylene material; the shielding layer 4 is a silver-plated copper monofilament braided shielding layer; the outer sheath 5 is made of flame-retardant polyvinyl chloride material; the support frame is made of nylon 66 materials.
The derivation formula of the characteristic impedance at high frequency is:
z-cable impedance Ω;
ε D -cable equivalent relative permittivity;
d, inner diameter of the outer conductor of the cable;
d-the outer diameter of the inner conductor of the cable.
In the formula, the equivalent relative dielectric constant is formed by the dielectric constants of the insulating layer 2, the inner sheath 3 and the air, the number of the support frames is small, the support frames are fixed, the influence on the relative dielectric constant is negligible, and the formula can be written as follows:
z is the transmission cable impedance Ω;
ε protective cover -the dielectric constant of the inner sheath 3 of the transmission cable;
ε insulation board Insulating layer 2 dielectric constant of transmission cableCounting;
ε air conditioner -air dielectric constant within the insulating layer 2 of the transmission cable;
d, the inner diameter of a transmission cable shielding layer 4;
d insulation for a building -outer diameter of the insulation layer 2 of the transmission cable;
d hole(s) -transmission cable insulation 2 aperture;
d, the diameter of the conductor core 1 of the transmission cable.
The inner diameters of the insulating layer 2, the inner sheath 3 and the shielding layer 4 are fixed, the variable is only the diameter of the replaced conductor wire core 1, and the size of the replaced conductor wire core 1 is the value of d in the formula so as to adjust the impedance value of the transmission cable.
Example 1: as shown in fig. 1 and 2, the required impedance of the original transmission cable is changed from 122 Ω to 120 Ω due to the replacement of the tested electrical components, and the support frame 6 with internal teeth, the insulating layer 2, the inner sheath 3 and the air form a signal transmission medium. The transmission cable changes the air content of the cable by adjusting the outer diameter of the conductor wire core 1, thereby changing the dielectric constant of a composite transmission medium consisting of the insulating layer 2, the inner sheath 3, the support frame 6 with the inner teeth and the air, and finally realizing the adjustment of the impedance of the cable. Calculating the diameter of the conductor core 1 by using a calculation formula of impedance at high frequency, wherein the impedance Z of the transmission cable is known to be 120 omega, and the dielectric constant epsilon of the inner sheath 3 of the transmission cable Protective cover The value is 1.41, and the dielectric constant epsilon of the insulating layer 2 of the transmission cable Insulation board The value of 2.3 is the dielectric constant epsilon of air in the insulating layer 2 of the transmission cable Air conditioner The value is 1.0, the inner diameter D of the transmission cable shielding layer 4 is 10.5mm, and the outer diameter D of the transmission cable insulating layer 2 Insulation board The value of 3.0mm and the aperture d of the insulating layer 2 of the transmission cable Hole(s) The value of 1.6mm is as follows:
where d is the only unknown, d is found to be about 0.94mm. The supporting frames 6 with the inner teeth penetrate through the middle holes I6-1 to the prepared conductor wire cores 1 with the diameter of 0.94mm, the plurality of supporting frames 6 with the inner teeth are arranged on the conductor wire cores 1 at intervals, the plurality of supporting frames 6 with the inner teeth are fixedly grabbed on the conductor wire cores 1 through interference fit of the plurality of teeth 6-2 and the conductor wire cores 1, and then the conductor wire cores 1 with the diameter of 0.94mm sleeved with the plurality of supporting frames 6 with the inner teeth integrally penetrate through the cut short wire sleeves with the length of one meter to form the transmission cable.
When the device is used, the transmission cable is connected to a high-precision equipment and a tested electric appliance element for signal transmission.
Example 2: as shown in fig. 3 and 4, according to the internal impedance value of the electrical component, the required transmission impedance is 100 Ω, the annular support 7, the insulating layer 2, the inner sheath 3 and air jointly form a signal transmission medium, and the transmission cable adjusts the outer diameter of the conductor core 1 and changes the air content of the cable, so that the dielectric constant of the composite transmission medium formed by the insulating layer 2, the inner sheath 3, the annular support 7 and the air is changed, and finally the characteristic impedance of the cable is adjusted. The diameter of the conductor wire core 1 required by calculation of a calculation formula of impedance under high frequency is 1.4mm, an annular support frame 7 with the inner diameter of 1.4mm is selected, the plurality of annular support frames 7 penetrate through the central hole II 7-1 to the conductor wire core 1, the plurality of annular support frames 7 are arranged on the conductor wire core 1 at intervals, the plurality of annular support frames 7 are fixed on the conductor wire core 1 through transition fit of the central hole II 7-1 and the conductor wire core 1, and then the whole of the conductor wire core 1 with the diameter of 1.4mm, fixed with the plurality of annular support frames 7, penetrates into a short wire sleeve with the length of one meter and then two end sockets form a transmission cable.
When the device is used, the transmission cable is connected to a high-precision equipment instrument and an electrical appliance element to be tested for signal transmission.
As shown in figure 4, the annular support frame 7 is a circular body, a middle hole II 7-1 is arranged at the center of the circular body, and the inner diameter of the middle hole II 7-1 is 0.5 mm-1.5 mm.
And an annular support frame 7 with corresponding inner diameter is configured according to the outer diameters of the conductor wire cores 1 with different sizes.
Claims (10)
1. A method for manufacturing a transmission cable with adjustable rapid assembly impedance is characterized by comprising the following steps:
the first step is as follows: cutting a cable sleeve consisting of the insulating layer (2), the inner sheath (3), the shielding layer (4) and the outer sheath (5) into a 0.5-1.2 m short-line sleeve;
the second step is that: calculating the diameter of a conductor core (1) of the cable by using a derivation formula of characteristic impedance under high frequency according to the impedance value of an electrical element;
the third step: the conductor wire core (1) with the required diameter is inserted into a plurality of internal tooth supporting frames (6) for fixing;
the fourth step: and the conductor core (1) sleeved with the plurality of internal tooth supporting frames (6) is integrally penetrated into the stub sleeve, and then two end enclosures form the transmission cable.
2. The method of claim 1, wherein the derivation formula of the characteristic impedance at high frequency is as follows:
z-transmission cable impedance (Ω);
ε protective cover -the dielectric constant of the inner sheath of the transmission cable;
ε insulation board -the dielectric constant of the transmission cable insulation;
ε air conditioner -the dielectric constant of the air in the insulating layer of the transmission cable;
d, the inner diameter of a shielding layer of the transmission cable;
d insulation board -outer diameter of the insulation layer of the transmission cable;
d hole(s) -transmission cable insulation layer aperture;
d, the diameter of the conductor core of the transmission cable.
3. The utility model provides a fast assembly impedance adjustable transmission cable, includes conductor sinle silk (1), insulating layer (2), inner sheath (3), shielding layer (4), oversheath (5), its characterized in that: the support frame is a support frame (6) with internal teeth; a plurality of internal tooth support frames (6) are arranged at intervals outside the conductor wire core (1), an insulating layer (2), an inner sheath (3), a shielding layer (4) and an outer sheath (5) are sequentially arranged outside the plurality of internal tooth support frames (6), the conductor wire core (1) is in interference fit with the plurality of internal tooth support frames (6), and the plurality of internal tooth support frames (6) are in clearance fit with the insulating layer (2); a plurality of teeth (6-2) are uniformly arranged on the inner diameter of a middle hole I (6-1) of the support frame (6) with the inner teeth.
4. A fast assembling impedance tunable transmission cable according to claim 3, wherein: the support frame is an annular support frame (7) provided with a middle hole II (7-1), and the inner diameter of the middle hole II (7-1) is 0.5 mm-1.5 mm.
5. A fast assembling impedance tunable transmission cable according to claim 3, wherein: the inner diameter of the mesopore I (6-1) is 0.5mm or 1.0mm.
6. A fast assembling impedance tunable transmission cable according to claim 3, wherein: the diameter of the conductor wire core (1) is 0.5 mm-1.5 mm.
7. A fast assembling impedance tunable transmission cable according to claim 3, wherein: the insulating layer (2) is a tubular insulating layer made of polypropylene material; the inner sheath (3) is made of foamed polyethylene material.
8. A fast assembling impedance tunable transmission cable according to claim 3, wherein: the shielding layer (4) is a silver-plated copper monofilament braided shielding layer.
9. A fast assembling impedance tunable transmission cable according to claim 3, wherein: the outer sheath (5) is made of flame-retardant polyvinyl chloride materials.
10. A fast assembling impedance tunable transmission cable according to claim 3, wherein: the support frame is made of nylon 66 materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310173723.0A CN115862961B (en) | 2023-02-28 | 2023-02-28 | Quick assembly impedance-adjustable transmission cable and manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310173723.0A CN115862961B (en) | 2023-02-28 | 2023-02-28 | Quick assembly impedance-adjustable transmission cable and manufacturing method |
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| CN115862961A true CN115862961A (en) | 2023-03-28 |
| CN115862961B CN115862961B (en) | 2023-05-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007250235A (en) * | 2006-03-14 | 2007-09-27 | Ube Nitto Kasei Co Ltd | Hollow core object for coaxial cable, manufacturing method of core object, and coaxial cable using this core object |
| CN101383203A (en) * | 2008-10-17 | 2009-03-11 | 天津亿鑫通科技股份有限公司 | Coaxial cable for ultramicro signal transmission |
| CN201600955U (en) * | 2009-09-28 | 2010-10-06 | 深圳市联嘉祥科技股份有限公司 | Novel coaxial cable for video security monitoring |
| CN102237622A (en) * | 2010-04-02 | 2011-11-09 | 约翰·梅扎林瓜联合有限公司 | Impedance management in coaxial cable terminations |
| CN114999729A (en) * | 2022-04-25 | 2022-09-02 | 南京全信传输科技股份有限公司 | Low-smoke halogen-free flame-retardant coaxial cable with characteristic impedance of 50 omega for rail transit |
-
2023
- 2023-02-28 CN CN202310173723.0A patent/CN115862961B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007250235A (en) * | 2006-03-14 | 2007-09-27 | Ube Nitto Kasei Co Ltd | Hollow core object for coaxial cable, manufacturing method of core object, and coaxial cable using this core object |
| CN101383203A (en) * | 2008-10-17 | 2009-03-11 | 天津亿鑫通科技股份有限公司 | Coaxial cable for ultramicro signal transmission |
| CN201600955U (en) * | 2009-09-28 | 2010-10-06 | 深圳市联嘉祥科技股份有限公司 | Novel coaxial cable for video security monitoring |
| CN102237622A (en) * | 2010-04-02 | 2011-11-09 | 约翰·梅扎林瓜联合有限公司 | Impedance management in coaxial cable terminations |
| CN114999729A (en) * | 2022-04-25 | 2022-09-02 | 南京全信传输科技股份有限公司 | Low-smoke halogen-free flame-retardant coaxial cable with characteristic impedance of 50 omega for rail transit |
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| CN115862961B (en) | 2023-05-12 |
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