CN210865721U - Digital communication cable twisted wire group rib type sheath - Google Patents

Abstract

The utility model discloses a digital communication cable stranded conductor group rib formula sheath, including the sheath body, be provided with a plurality of support ribs on the internal face of sheath body, the rib tip of support rib is located four circumferences respectively. The support ribs on the inner wall surface of the sheath body are arranged at intervals, and the diameters of four circumferential surfaces where the end parts of the support ribs are located are equal. Support ribs corresponding to the same circumferential surface extend from the perpendicular direction to the circumferential surface. The support ribs are integrally extruded with the jacket body. The stranded wire group supporting sheath can reliably hold and stably support a pair of stranded wire groups, and is particularly suitable for a stranded wire group sheath structure of a digital communication cable.

Description

Digital communication cable twisted wire group rib type sheath

Technical Field

The utility model relates to a digital communication cable especially relates to a digital communication cable inner sheath structure's improvement with support rib.

Background

The high frequency and high rate performance of the digital communication cable is closely related to the performance indexes such as impedance, attenuation and crosstalk. In the impedance performance of a digital communication cable, the characteristic impedance is mainly affected by the dielectric constant, the insulating layer of the conductor, the outer diameter of the conductor and the twist number per unit length, while the input impedance of the cable is largely related by the outer diameter of the conductor, the mutual positions of paired groups and the spacing structure of the conductors of the cable. The line group structure and the mutual position distance of the conductors cause the change of input impedance, and the capacitance value and the attenuation value between the conductors deviate from the ideal values, which obviously causes the fluctuation and the reduction of the transmission performance of the cable. One of the more important parameters affecting the performance of digital communication cables, especially high frequency digital cables, is crosstalk, and the systematic coupling crosstalk caused by electromagnetic coupling is caused by the mutual interference caused by the physical distance between conductors and between line groups, which is largely determined by the mutual positions of conductor loops, such as the constancy of the line group spacing, the stable state of the line group position, and the like. Therefore, indexes such as impedance, attenuation and crosstalk which affect the performance of the high-frequency digital communication cable are directly related to the positions and the structural stability of the wire groups, in other words, the high performance of the cable can be ensured only by ensuring the mutual positions and the structural stability of the wire groups.

The digital communication cable is formed by twisting eight insulating core wires into four pairs of wire groups in pairs, twisting the four pairs of wire groups into a cable, and finally extruding an outer sheath. However, in the existing cable structure, the relative position between the paired groups is fixed only by the outer sheath of the cable, and the laying, pulling and twisting of the cable can generate traction, stretching and extrusion effects on the cable structure, so that the relative position of the paired groups is displaced and changed, and even in the cable looping process, the structural parameters of the paired groups are changed. The fixed and compact action of the cable outer sheath can cause the mutual nesting of the wire groups, so that an insulating core wire in one pair of wire groups invades into the circumscribed circle space of the other pair of wire groups, and the displacement or embedding of the wire groups can cause the space clearance of the wire groups to be reduced or not effectively ensured. In short, the instability of the cable structure inevitably causes the deterioration of performance indexes such as input impedance, near-end crosstalk, far-end crosstalk and attenuation, and seriously restricts the improvement of the working frequency and the data transmission speed of the data communication cable.

In order to improve the transmission performance of the digital cable, the digital cable with the cross separation framework is developed, the cross separation framework divides the space in the outer sheath into four space areas for accommodating the paired line groups, one paired line group is arranged in each area, the structure can effectively prevent the paired line groups from being nested with each other, but because the paired line groups and the inner sheath in the structure and a larger gap still exists between the paired line groups and wing plates of the cross framework, the cross framework plays a role in separating the four paired line groups, the fixing effect of the cross framework and the inner sheath on the paired line groups is very limited, and the support can form larger extrusion contact stress on the paired line groups, and the paired line groups are more easily subjected to extrusion deformation and displacement. Therefore, the positioning capability of the existing inner sheath and the cross framework for the line group is insufficient, and the line group cannot be reliably fixed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a digital communication cable stranded conductor group rib formula sheath that can reliably grip and support the formation of twisted pair group is provided.

In order to solve the technical problem, the utility model discloses a digital communication cable twisted wire group rib formula sheath, including the sheath body, be provided with a plurality of support ribs on the internal face of sheath body, the rib tip of support rib is located four periphery respectively.

In the structure, because the inner wall surface of the sheath body of the cable inner sheath is provided with the plurality of supporting ribs, the end parts of the supporting ribs are respectively positioned on four circumferential surfaces capable of accommodating the twisted pair groups, one side of the supporting ribs forms stable holding on the corresponding twisted pair groups, the shifting and the moving of the twisted pair groups are avoided, the cable core structure keeps a more stable and reliable position state, the holding structure also prevents the mutual embedding of the twisted pair groups, and the interference caused by the mutual embedding of the twisted pair groups is avoided; on the other hand, the holding structure greatly enhances the supporting contact area of the twisted wire group, reduces the holding contact stress of the wire group, plays a firm role in the wire group from the aspects of position state, appearance structure and the like, ensures the stability of each parameter of the cable, improves the working frequency of the cable for transmitting digital signals, and accelerates the data transmission speed.

The utility model discloses a preferred embodiment, the support rib mutual interval on the sheath body internal face sets up, and four periphery diameters at support rib tip place equal. Support ribs corresponding to the same circumferential surface extend from the perpendicular direction to the circumferential surface. The support ribs are integrally extruded with the jacket body. The structure is more stable, and the effect of firmly holding the twisted wire set is better.

Drawings

The digital communication cable stranded conductor rib type sheath of the present invention will be further explained with reference to the accompanying drawings and the specific embodiments.

Fig. 1 is a schematic cross-sectional view of a ribbed sheath for a digital communication cable.

In the figure, 1 is the jacket body, 2 is the support rib.

Detailed Description

The digital communication cable twisted-pair ribbed sheath shown in fig. 1 comprises a sheath body 1 and a plurality of flaky supporting ribs 2 which are arranged on the inner wall surface of the sheath body 1 at intervals, wherein the sheath body 1 and the supporting ribs 2 thereon are extruded into an integral structure by using (polyolefin or polyvinyl chloride) as a material. The rib ends of a plurality of support ribs 2 positioned on the inner wall surface of the sheath body 1 are respectively positioned on four circumferential surfaces, and the diameters of the four circumferential surfaces are equal. In practice, each circumferential surface corresponds to the outer diameter of a pair of twisted wire sets so as to better accommodate and hold the corresponding pair of twisted wire sets. The supporting ribs 2 corresponding to each circumferential surface extend to the circumferential surface along two mutually perpendicular radial directions, and the mutually perpendicular ribs are parallel to the mutually perpendicular fins of the cross-shaped framework, so that a stable holding effect on the twisted wire group is formed.

Claims (4)

1. The utility model provides a digital communication cable stranded conductor group rib formula sheath, includes sheath body (1), its characterized in that: the inner wall surface of the sheath body (1) is provided with a plurality of supporting ribs (2), and the rib end parts of the supporting ribs (2) are respectively positioned on four circumferential surfaces.

2. The ribbed digital communication cable strand sheath of claim 1, wherein: the supporting ribs (2) on the inner wall surface of the sheath body (1) are arranged at intervals, and the diameters of four circumferential surfaces where the rib ends of the supporting ribs (2) are arranged are equal.

3. The ribbed sheath of digital communication cable twisted pair according to claim 1 or 2, characterized in that: the support ribs (2) corresponding to the same circumferential surface extend from the perpendicular direction to the circumferential surface.

4. The ribbed sheath of digital communication cable twisted pair according to claim 1 or 2, characterized in that: the supporting ribs (2) and the jacket body (1) are integrated through extrusion molding.

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