CN218159685U - Composite multi-tube digital transmission tri-coaxial cable - Google Patents

Abstract

A composite multi-tube digital transmission triaxial cable, including a central layer, a middle layer and an outer layer; the central layer includes a second layer of braided strips, three first cores and three sets of second cores; the middle layer includes a third layer of braiding strips and eight sets of third cores; the outer layer includes an outer jacket and plastic iron sheets; each first core includes a first conductor, a first layer of braided strips and an inner sheath, and the first layer of braided strips is wrapped around the outside of the first conductor , the inner sheath is wrapped on the outside of the first layer of braided strips, the three first cores are adjacent to each other, and the three first cores are wrapped by the second layer of braided strips; each group of second cores is composed of two second conductors; each The third core of the group is composed of two third conductors; the plastic iron sheet is embedded in the middle of the outer jacket, and the outer jacket is wrapped outside the third layer of braided strips. The first conductor, the second conductor and the third conductor are composed of several types of conductors; this practical The new type has a compact structure and a stable internal structure, which improves the anti-interference effect while ensuring correct signal transmission.

Description

A composite multi-tube digital transmission triax cable

technical field

The utility model belongs to the technical field of cables, in particular to a composite multi-tube digital transmission triaxial cable.

Background technique

With the rapid development of economy and society, digital TV has entered thousands of households. The coaxial cables commonly used on the market are generally composed of inner conductors, insulating layers, outer conductor shielding layers, plastic composite tapes, copper wire braids, and insulating sheaths. However, when the existing coaxial cable is used, the transmission signal will have defects: the shielding effect is not ideal, and in some occasions where there are many signal sources, the transmission signal is easily interfered, resulting in obvious distortion of the signal, and the shielding effect is only 75 decibels; Noise will be generated when the signal is transmitted, and the noise will increase with the increase of the signal transmission frequency, which will greatly affect the frequency effect of the terminal equipment receiving the signal.

This product is used for high-definition image control equipment for color difference signal transmission. The center is composed of three coaxial cables, which have a better anti-interference effect than conventional twisted pairs. The three coaxial cables are then cabled with multiple pairs of twisted wires, and then braided twice. The integrated coding line unit transmits signals and improves Shielding effect.

Utility model content

The purpose of this utility model is to solve the problem that the existing signal conductive cables cannot simultaneously have the three advantages of good flexibility, low temperature resistance and low noise and reach the technical indicators in high-end technical equipment such as medical equipment and precision control equipment. The technical problem of meeting the use requirements of some high-end technical equipment is to provide a low-temperature-resistant and low-noise flexible cable.

In order to solve the above problems, the utility model provides the following technical solutions: a composite multi-tube digital transmission triaxial cable, including a central layer, an intermediate layer and an outer layer; the central layer includes a second layer of braided strips, three first cores and Three sets of second wire cores; the middle layer includes the third layer of braided strips and eight sets of third wire cores; the outer layer includes outer jacket and plastic iron sheet; each first wire core includes the first conductor, the first layer of braided strips and the inner sheath The first layer of braided strips is wrapped around the outside of the first conductor, the inner sheath is wrapped around the outside of the first layer of braided strips, the three first cores are adjacent to each other, and the three first cores are adjacent to each other. A core is wrapped by the second layer of braided strips; each set of second cores is composed of two second conductors, and the second core is located between every two first cores and the second layer of braiding. Between the strips; each group of the third wire core is composed of two third conductors, the third wire core is located between the second layer of braided strips and the third layer of braided strips; the plastic iron sheet is embedded in The outer jacket is in the middle, the outer jacket is wrapped outside the third layer of braided strips, and the first conductor, the second conductor and the third conductor are composed of several types of conductors.

Preferably, the central layer further includes a first strap and a second strap, the first strap is located inside the second layer of braided strips, and the second strap is positioned inside the second layer of braided strips outside.

Preferably, the middle layer further includes a third strap and a fourth strap, the third strap is located inside the braided strip of the third layer, and the fourth strap is positioned inside the braided strip of the third layer. outside.

Preferably, the central layer also includes six first-layer fillers, the cross-section of the first-layer filler perpendicular to the axis is circular, and the first-layer fillers are located on the second wire core, the first wire between the core and the first tape.

Preferably, the middle layer also includes eight second-layer fillers, the cross-section of the second-layer filler perpendicular to the axis is elliptical, and each second-layer filler is located at two adjacent third wire cores. between.

Preferably, the three first cores are completely untwisted, and the pitch ratio of the second conductor and the third conductor is less than eight times.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. Triaxial and multi-pair twisted wires are integrated to reduce the space occupied by wires;

2. Coaxial or twisted structure and three-layer weaving are used to greatly improve the shielding effect;

3. The twist-back rate of conventional wires is up to 100%, and the twist-back rate of wires of this specification reaches more than 150%, matching the wires into cables, so that the torque can be fully released;

4. The insulation and jacket with high mechanical properties are selected, which can meet the effect of two million drag chains.

Description of drawings

Fig. 1 is a radial sectional view of the utility model embodiment.

Fig. 2 is a radial sectional view of the central layer of the embodiment of the utility model.

Fig. 3 is a radial sectional view of the middle layer of the embodiment of the present invention.

Fig. 4 is a radial sectional view of the outer layer of the embodiment of the present invention.

Fig. 5 is a perspective view of the twisted second wire core of the embodiment of the present invention.

Fig. 6 is a perspective view of the stranding of the third wire core in the embodiment of the present invention.

In the figure, 1. the first core, 2. the second core, 3. the third core, 4. the first tape, 5. the second tape, 6. the third tape, 7. the fourth tape, 8. Inner sheath, 9. Outer quilt, 10. The first layer of braided strips, 11. The second layer of braided strips, 12. The third layer of braided layers, 13. The first layer of padding, 14. The second layer of padding, 15. Plastic iron sheet, 16. first conductor, 17. second conductor, 18. third conductor, 19. center layer, 20. middle layer, 21. outer layer.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Referring to Figures 1-6, a composite multi-tube digital transmission triaxial cable includes a central layer 19, an intermediate layer 20 and an outer layer 21; the central layer 19 includes a second braided strip 11, three first cores 1 and three Group second wire core 2; Intermediate layer 20 includes the third layer of braided strips 12 and eight groups of third wire cores 3; Outer layer 21 includes outer jacket 9 and plastic iron sheet 15; Every first wire core 1 includes first conductor 16, The first braided strip 10 and the inner sheath 8, the first braided strip 10 is wrapped on the outside of the first conductor 16, the inner sheath 8 is wrapped on the outside of the first braided strip 10, and the three first cores 1 are adjacent to each other in pairs , the three first cores 1 are wrapped by the second layer of braiding strips 11; each set of second cores 2 is composed of two second conductors 17, and the second cores 2 are located between every two first cores 1 and the second layer of braiding strips 11; each group of third wire cores 3 is composed of two third conductors 18, and the third wire core 3 is located between the second layer of braided strips 11 and the third layer of braided strips 12; the plastic iron sheet 15 is embedded in the middle of the outer quilt 9, The outer jacket 9 is wrapped outside the third layer of braided strips 12. The first conductor 16, the second conductor 17 and the third conductor 18 are composed of several 6 types of conductors; The wear and tear of the cable increases the service life of the cable. The three coaxial cables in the center use foam insulation PE to meet the impedance requirements, ensuring the transmission performance of the line while reducing the wire diameter. After the core wire insulation is extruded, it is braided and inner sheathed Extruded, greatly improving the anti-interference effect and ensuring the stability of the structure, and reducing the space occupied by the wire; the twisted unit core wire is insulated with PE, which meets the mechanical properties while reducing the wire diameter; the plastic iron sheet 15 can shape the cable, It is convenient to fix the shape of the cable when using it; the use of three-layer braiding can greatly improve the shielding effect; the selection of high mechanical performance insulation and outer cover can meet the effect of two million drag chains, and the inner sheath 8 is made of TPU material to improve the wear resistance of the wire Pulling capacity, the outer cover 9 is made of PVC plastic particles, which has superior mechanical properties, chemical corrosion resistance, good weather resistance, good insulation performance, and easy processing; the first layer of braided strips 10, the second layer of braided strips 11 and the third layer The braided strip 12 is made of silver-plated copper conductor, and the weaving method is the plum blossom cross method, which can ensure the flexibility of the cable and is used to shield the interference of the outer electromagnetic wave on the cable.

The central layer 19 also includes a first strap 4 and a second strap 5, the first strap 4 is located inside the second layer of braided strip 11, and the second strap 5 is positioned outside the second layer of braided strip 11; the strap adopts a special adhesive tape To increase the strength of the tape, the center unit adopts back-twisting cable, and the back-twisting rate must exceed 100% so that the center is completely back-twisted to avoid twisting.

The middle layer 20 also includes a third strap 6 and a fourth strap 7, the third strap 6 is positioned at the inner side of the third layer of woven strip 12, and the fourth strap 7 is positioned at the outside of the third layer of braided strip 12; the strap can protect the inside The structure ensures that the cable will not be strained and deformed when the impedance is satisfied, and the service life of the cable is increased.

The central layer 19 also includes six first-layer fillers 13, the cross-section of the first-layer filler 13 perpendicular to the axis is circular, and the first-layer filler 13 is located between the second core 2, the first core 1 and the first tape 4 The filling can effectively fix the internal structure of the cable and prevent the core deformation caused by many processing procedures.

The middle layer 20 also includes eight second layers of fillers 14, the cross section of the second layer of fillers 14 perpendicular to the axis is elliptical, and each second layer of fillers 14 is located between two adjacent third wire cores 3; The internal structure can also play a certain sound insulation effect and ensure the effective transmission of signals; the first layer of filling 13 and the second layer of filling 14 are composed of copper core conductors and carbon fibers, which makes the cable structure stable, reduces cable twisting, and increases service life.

The three first wire cores 1 are completely untwisted, and the pitch ratio of the second conductor 17 and the third conductor 18 is less than eight times; the pair twisting adopts a pitch ratio of less than eight times to improve the wire transmission effect and improve the structural stability. Prevent the wire from being deformed and discounted during the production process.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (6)

1. The utility model provides a compound multitube digital transmission triaxial cable which characterized in that: comprising a central layer (19), an intermediate layer (20) and an outer layer (21); the central layer (19) comprises a second layer of weaving strips (11), three first bobbins (1) and three groups of second bobbins (2); the middle layer (20) comprises a third layer of weaving strips (12) and eight groups of third wire cores (3); the outer layer (21) comprises an outer cover (9) and a plastic iron sheet (15); each first bobbin (1) comprises a first conductor (16), a first layer of woven strips (10) and an inner protection layer (8), the first layer of woven strips (10) wraps the outer side of the first conductor (16), the inner protection layer (8) wraps the outer side of the first layer of woven strips (10), the three first bobbins (1) are adjacent to each other in pairs, and the three first bobbins (1) are wrapped by the second layer of woven strips (11); each group of the second wire cores (2) consists of two second conductors (17), and the second wire cores (2) are positioned between every two first wire cores (1) and the second layer of the braided strips (11); each set of said third wicks (3) consists of two third conductors (18), said third wicks (3) being located between said second layer of woven strips (11) and said third layer of woven strips (12); the plastic iron sheet (15) is inlaid in the middle of the outer cover (9), the outer cover (9) is wrapped outside the third-layer woven strip (12), and the first conductor (16), the second conductor (17) and the third conductor (18) are composed of a plurality of 6 types of conductors.

2. The composite multi-tube digital transmission triaxial cable according to claim 1, wherein: the central layer (19) further comprises a first wrapping tape (4) and a second wrapping tape (5), the first wrapping tape (4) is located on the inner side of the second layer of woven strips (11), and the second wrapping tape (5) is located on the outer side of the second layer of woven strips (11).

3. The composite multi-tube digital transmission triaxial cable according to claim 2, wherein: the middle layer (20) further comprises a third wrapping tape (6) and a fourth wrapping tape (7), the third wrapping tape (6) is located on the inner side of the third layer of woven strips (12), and the fourth wrapping tape (7) is located on the outer side of the third layer of woven strips (12).

4. The composite multi-tube digital transmission triaxial cable of claim 3, wherein: the core layer (19) further comprises six first-layer fillers (13), the cross section of each first-layer filler (13) perpendicular to the axis is circular, and the first-layer fillers (13) are located among the second line cores (2), the first line cores (1) and the first wrapping tape (4).

5. The composite multi-tube digital transmission triaxial cable of claim 4, wherein: the middle layer (20) further comprises eight second layer fillings (14), the cross section of each second layer filling (14) perpendicular to the axis is oval, and each second layer filling (14) is located between two adjacent third mandrels (3).

6. The composite multi-tube digital transmission triaxial cable of claim 5, wherein: the three first wire cores (1) are completely untwisted, and the twist-to-twist pitch diameter ratio of the second conductor (17) and the third conductor (18) is below eight times.

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