CN115862961B - Quick assembly impedance-adjustable transmission cable and manufacturing method - Google Patents
Quick assembly impedance-adjustable transmission cable and manufacturing method Download PDFInfo
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- CN115862961B CN115862961B CN202310173723.0A CN202310173723A CN115862961B CN 115862961 B CN115862961 B CN 115862961B CN 202310173723 A CN202310173723 A CN 202310173723A CN 115862961 B CN115862961 B CN 115862961B
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Abstract
A quick assembly impedance adjustable transmission cable and a manufacturing method thereof, a cable sleeve formed by an insulating layer, an inner sheath, a shielding layer and an outer sheath is cut into a short-line sleeve of 0.5m to 1.2 m; calculating the diameter of the cable conductor core by using a derivation formula of characteristic impedance under high frequency according to the impedance value of the electrical element; penetrating a conductor core with a required diameter into a plurality of support frames with internal teeth for fixation; the transmission cable is formed by penetrating a plurality of conductor cores sleeved with the internal tooth support frames into the short-wire sleeve and then sealing heads at two ends. The conductor core has the characteristic of being replaceable, finished cables with different sections do not need to be stored, conductors with different diameters only need to be stored, the inner conductor core is replaced when the novel cable is used, and the novel cable is simple and quick to operate and easy to operate.
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 impediment to current flow in a circuit having a resistance, an inductance, and a capacitance, and is one of the important parameters of cable transmission. The impedance matching is mainly used for a transmission line, so that the aim of enabling all high-frequency microwave signals to be transmitted to a load point is fulfilled, power transmission is maximized, signal reflection at a target equipment end is minimized, and signal transmission efficiency is improved. When signals are transmitted between the high-precision equipment and the electrical components, the characteristic impedance requirement on the 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 to a source point, and signal loss is caused; the high-precision device is equipped with an impedance transformer for measuring the output impedance of the different electrical components, while the characteristic impedance inside the transmission cable acting as a connection of the high-precision device to the electrical components determines whether maximum power transmission can be achieved.
In the traditional transmission cable, each structure of the cable is tightly fixed and is not detachable, if the output impedance of high-precision equipment is matched aiming at different tested elements, the maximum power transmission is achieved, and different transmission cables are required to be replaced, so that cable products with various specifications are required to be stored for convenient use, the material cost and the labor cost are increased, and the use of the high-precision equipment is limited. For example, the high-performance transmission coaxial cable with the patent number of CN204189513U has a fixed overall structure, and can achieve maximum power transmission only when the output impedance reaches a specific value, and the cable with corresponding specification needs to be replaced if the output impedance changes.
Disclosure of Invention
In view of the problems that the characteristic impedance of a transmission cable and an electrical element in the prior art is not matched, the signal transmission efficiency is reduced, or the transmission cables with different specifications are required to be replaced to achieve the maximum transmission power, so that the cost is wasted, the replacement period is long, the invention provides a transmission cable with adjustable rapid assembly impedance and a manufacturing method. The conductor core, the supporting frame and the insulating layer are movable, and as the transmission cable for the high-precision equipment measuring electric element, 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 electric element and the output impedance of the high-precision equipment are adapted, the characteristic impedance of the transmission cable adapting electric element can achieve the maximum transmission efficiency, the production cost of the cable is reduced, and the resource waste is avoided.
In order to achieve the purposes, the technical scheme adopted by the patent is as follows: a manufacturing method of a transmission cable with adjustable rapid assembly impedance comprises the following steps:
the first step: cutting a cable sleeve formed by an insulating layer, an inner sheath, a shielding layer and an outer sheath into a short-wire sleeve of 0.5-1.2 m;
and a second step of: calculating the diameter of the cable conductor core by using a derivation formula of characteristic impedance under high frequency according to the impedance value of the electrical element;
and a third step of: penetrating a conductor core with a required diameter into a plurality of support frames with internal teeth for fixation;
fourth step: and penetrating the whole body sleeved with the plurality of conductor cores with the internal tooth support frames into a short wire sleeve, and then forming the transmission cable by two end covers.
The transmission cable with the adjustable rapid assembly impedance comprises a conductor core, an insulating layer, an inner sheath, a shielding layer and an outer sheath, and also comprises a support frame, wherein the support frame is a support frame with internal teeth;
the conductor wire core is in interference fit with the plurality of internal tooth support frames, and the plurality of internal tooth support frames are in clearance fit with the insulating layer; the inner diameter of the middle hole I with the internal tooth support frame is uniformly provided with a plurality of teeth.
The beneficial effect of this patent is: in the prior art, the transmission cable is required to be designed and produced according to different output impedance of the equipment, and the cost is increased by reserving cable products with different sections, but if the cable products are not reserved, the cable with the corresponding section cannot be replaced in time to achieve the maximum transmission power for measurement. The conductor core has the characteristic of being replaceable, finished cables with different sections do not need to be stored, conductors with different diameters only need to be stored, the inner conductor core is replaced when the novel cable is used, and the novel cable is simple and quick to operate and easy to operate.
The support frame with the internal teeth or the annular support frame is made of nylon 66 material, has good mechanical property, excellent flexibility and excellent self-lubricating property, and can be clamped on a conductor wire core through the structural design of a plurality of teeth, and the conductor wire core is positioned at the center of a stub sleeve of a cable, so that the stability of the electrical property of the cable is ensured.
The annular support frame can be fastened on the conductor core through the structural design of the middle hole II, and the conductor core is positioned at the center of the stub sleeve of the cable, so that the stability of the electrical performance of the cable is ensured.
The conductor 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 can be adjusted within the range of 96-151 omega so as to be matched with the output impedance of 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 prevented.
The conductor core adopts a solid single silver-plated copper conductor, the silver-plated copper conductor has excellent electrical conductivity, thermal conductivity, corrosion resistance and high-temperature oxidation resistance, the diameter of the silver-plated copper conductor can be adjusted within the range of 0.5 mm-1.5 mm according to the output impedance of high-precision equipment, and conductors with different specifications can be used for achieving required impedance values so as to match the output impedance of the high-precision equipment, so that partial waves in cable transmission are prevented from being reflected from the mismatch of the cable, and signal loss is caused.
The insulating layer adopts 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 protective layer is made of foamed polyethylene material, and has the characteristics of light weight, good heat insulation, strong anti-interference performance, low dielectric constant and the like, so that signals can be reliably transmitted, and the signals can be reliably transmitted in a longer distance.
The shielding layer is made of 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 block diagram of a transmission cable incorporating a support with internal teeth in accordance with the present invention;
FIG. 2 is a schematic view of the structure of the internally toothed support frame of the present invention;
FIG. 3 is a block diagram of a transmission cable incorporating an annular support frame in accordance with the present invention;
fig. 4 is a schematic structural view of the annular supporting frame of the present invention.
Detailed Description
As shown in fig. 1 and 2, a transmission cable with adjustable rapid assembly impedance comprises a conductor core 1, an insulating layer 2, an inner sheath 3, a shielding layer 4 and an outer sheath 5, and further comprises a supporting frame, wherein the supporting frame is a supporting frame 6 with internal teeth.
Extruding a tubular insulating layer 2 with fixed aperture and outer diameter, wherein the insulating layer 2 is a hollow insulating layer, extruding a foaming inner sheath 3 outside the insulating layer 2, braiding a shielding layer 4 outside the inner sheath 3, extruding an outer sheath 5 outside the shielding layer 4 to form a cable sleeve, and cutting the cable sleeve into a short-wire sleeve of 0.5-1.2 m for standby according to the use environment in order to ensure that a conductor wire core 1 and a support frame 6 with internal teeth can penetrate into the hollow hole of the tubular insulating layer 2. Before selecting a conductor wire core 1, setting output impedance values of high-precision equipment according to different tested electrical elements, calculating the diameter of the required conductor wire core by using a calculation formula, sleeving a plurality of support frames 6 with internal teeth outside the calculated conductor wire core 1, fixing the support frames 6 with internal teeth on the conductor wire core 1 through interference fit of a plurality of teeth 6-2 and the conductor wire core 1, and manually penetrating the whole conductor wire core 1 with the fixed support frames 6 with internal teeth into a short wire sleeve to form a transmission cable at two end sockets.
As shown in fig. 2, the support frame 6 with 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 0.5mm or 1.0mm for better fixing the conductor core 1. Wherein the internal tooth support frame 6 with the inner diameter of 0.5mm can fix the conductor wire core 1 within the range of 0.5 mm-1.0 mm, and the internal tooth support frame 6 with the inner diameter of 1.0mm can fix the conductor wire core 1 within the range of 1.0 mm-1.5 mm. The external diameter of the support frame 6 with 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 core 1 adopts a solid single silver-plated copper conductor with any diameter in the range of 0.5 mm-1.5 mm. The characteristic impedance of the transmission cable can be adjusted so as to be matched with the output impedance in the high-precision equipment instrument, and partial waves in the cable can be prevented from being reflected from the mismatch of the cable, so that signal loss is prevented.
The insulating layer 2 is a tubular insulating layer made of polypropylene material; the inner sheath 3 is 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 material.
The derivation formula of the characteristic impedance at high frequency is:
z-cable impedance omega;
ε D -cable equivalent relative permittivity;
d-the inner diameter of the cable outer conductor;
d-cable inner conductor outer diameter.
The equivalent relative dielectric constant in the formula is that the dielectric constants of the insulating layer 2, the inner sheath 3 and the air are combined to form a small and fixed number of supporting frames, the influence of the supporting frames on the relative dielectric constant is negligible, and the formula can be written as follows:
z-transmission cable impedance Ω;
ε protection device -the dielectric constant of the transmission cable inner sheath 3;
ε insulation type -transmission cable insulation layer 2 dielectric constant;
ε empty space -air dielectric constant in the transmission cable insulation layer 2;
d—inner diameter of the transmission cable shield 4;
d insulation type -the outer diameter of the transmission cable insulation 2;
d hole(s) -transmission cable insulation layer 2 aperture;
d-diameter of the transmission cable conductor core 1.
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 core 1, and the size of the replaced conductor core 1, namely the value of d in the formula is replaced, so that the impedance value of the transmission cable is adjusted.
Example 1: as shown in fig. 1 and 2, the original 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 signal transmission medium is composed of the internal tooth support frame 6, the insulating layer 2, the inner sheath 3 and air. Transmission cable passageThe outer diameter of the conductor core 1 is adjusted, and the air content of the cable is changed, so that the dielectric constants of a composite transmission medium consisting of the insulating layer 2, the inner sheath 3, the support frame 6 with inner teeth and air are changed, and finally the impedance of the cable is adjusted. The diameter of the conductor core 1 is calculated using a calculation formula for impedance at high frequency, wherein the impedance Z of the transmission cable is known to be 120Ω, and the dielectric constant epsilon of the inner sheath 3 of the transmission cable Protection device The value of the dielectric constant epsilon of the insulating layer 2 of the transmission cable is 1.41 Insulation type The value of the dielectric constant epsilon of air in the insulating layer 2 of the transmission cable is 2.3 Empty space The value of the inner diameter D of the shielding layer 4 of the transmission cable is 1.0, the value of the inner diameter D of the shielding layer 4 of the transmission cable is 10.5mm, and the outer diameter D of the insulating layer 2 of the transmission cable Insulation type The value is 3.0mm, and the aperture d of the insulating layer 2 of the transmission cable Hole(s) The formula for the value of 1.6mm is as follows:
where d is the only unknown, and d is found to be about 0.94mm. The inner tooth support frames 6 are penetrated onto the prepared conductor wire core 1 with the diameter of 0.94mm through the middle holes I6-1, the inner tooth support frames 6 are arranged on the conductor wire core 1 at intervals, the inner tooth support frames 6 are fixedly clamped on the conductor wire core 1 through interference fit between the inner tooth support frames 6 and the conductor wire core 1, and then the conductor wire core 1 with the diameter of 0.94mm sleeved with the inner tooth support frames 6 is integrally penetrated into a cut short wire sleeve with the length of one meter to form a transmission cable.
When in use, the transmission cable is connected to the high-precision equipment and the tested electrical element for signal transmission.
Example 2: as shown in fig. 3 and 4, according to the internal impedance value of the electrical element, the required transmission impedance is 100 Ω, the annular supporting frame 7, the insulating layer 2, the inner sheath 3 and air form a signal transmission medium together, the transmission cable adjusts the outer diameter size of the conductor core 1, and simultaneously changes the air content of the cable, thereby changing the dielectric constant of the composite transmission medium formed by the insulating layer 2, the inner sheath 3, the annular supporting frame 7 and the air, and finally realizing the adjustment of the characteristic impedance of the cable. The diameter of the required conductor core 1 is calculated to be 1.4mm by using a calculation formula of impedance under high frequency, then an annular supporting frame 7 with the inner diameter of 1.4mm is selected, a plurality of annular supporting frames 7 penetrate onto the conductor core 1 through a middle hole II 7-1, the annular supporting frames 7 are arranged on the conductor core 1 at intervals, the annular supporting frames 7 are fixed on the conductor core 1 through transition fit between the middle hole II 7-1 and the conductor core 1, and then the whole body of the conductor core 1 with the diameter of 1.4mm, on which the annular supporting frames 7 are fixed, penetrates into a cut short-circuit sleeve with the length of one meter, and then two end covers form a transmission cable.
When in use, the transmission cable is connected to the high-precision equipment and the tested electrical element for signal transmission.
As shown in FIG. 4, the annular supporting 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.
The annular supporting frames 7 with corresponding inner diameters are configured according to the outer diameters of the conductor cores 1 with different sizes.
Claims (8)
1. The manufacturing method of the transmission cable with the adjustable rapid assembly impedance is characterized by comprising the following steps:
the first step: cutting a cable sleeve formed by an insulating layer (2), an inner sheath (3), a shielding layer (4) and an outer sheath (5) into a short-wire sleeve with the length of 0.5-1.2 m;
and a second step of: calculating the diameter of the cable conductor core (1) according to the impedance value of the electrical element by using a derivation formula of characteristic impedance under high frequency;
and a third step of: penetrating a conductor core (1) with a required diameter into a plurality of support frames (6) with internal teeth for fixation;
fourth step: penetrating the whole body of the conductor core (1) sleeved with the plurality of internal tooth supporting frames (6) into a short wire sleeve, and then forming a transmission cable by sealing heads at two ends;
the derivation formula of the characteristic impedance under the high frequency is as follows:
z-transmission cable impedance (Ω);
ε protection device -transmission cable inner sheath dielectric constant;
ε insulation type -transmission cable insulation dielectric constant;
ε empty space -air dielectric constant in the insulation layer of the transmission cable;
d-the inner diameter of the transmission cable shield;
d insulation type -transmission cable insulation outer diameter;
d hole(s) -transmission cable insulation layer aperture;
d-transmission cable conductor core diameter.
2. The utility model provides a fast assembly impedance adjustable transmission cable, includes conductor core (1), insulating layer (2), inner sheath (3), shielding layer (4), oversheath (5), its characterized in that: the device also comprises a support frame, wherein the support frame is a support frame (6) with internal teeth;
the novel cable conductor is characterized in that a plurality of internal tooth supporting frames (6) are arranged at the outer interval of the conductor 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 supporting frames (6), the conductor core (1) is in interference fit with the plurality of internal tooth supporting frames (6), and the plurality of internal tooth supporting frames (6) are in clearance fit with the insulating layer (2); the inner diameter of a middle hole I (6-1) with an inner tooth support frame (6) is uniformly provided with a plurality of teeth (6-2);
or the supporting frame is an annular supporting frame (7) provided with a middle hole II (7-1);
the novel cable conductor is characterized in that a plurality of annular supporting frames (7) are arranged at the outer interval of 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 annular supporting frames (7), the conductor wire core (1) is in interference fit with the plurality of annular supporting frames (7), and the plurality of annular supporting frames (7) are in clearance fit with the insulating layer (2);
the inner diameter of the middle hole II (7-1) is 0.5 mm-1.5 mm.
3. A fast assembly impedance adjustable transmission cable according to claim 2, wherein: the inner diameter of the middle hole I (6-1) is 0.5mm or 1.0mm.
4. A fast assembly impedance adjustable transmission cable according to claim 2, wherein: the diameter of the conductor core (1) is 0.5 mm-1.5 mm.
5. A fast assembly impedance adjustable transmission cable according to claim 2, wherein: the insulating layer (2) is a tubular insulating layer made of polypropylene material; the inner sheath (3) is made of foamed polyethylene material.
6. A fast assembly impedance adjustable transmission cable according to claim 2, wherein: the shielding layer (4) is a silver-plated copper monofilament braided shielding layer.
7. A fast assembly impedance adjustable transmission cable according to claim 2, wherein: the outer sheath (5) is made of flame-retardant polyvinyl chloride material.
8. A fast assembly impedance adjustable transmission cable according to claim 2, wherein: the support frame is made of nylon 66 material.
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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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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (3)
| 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 |
| US8177582B2 (en) * | 2010-04-02 | 2012-05-15 | John Mezzalingua Associates, Inc. | 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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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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