CN213366252U

CN213366252U - Parallel twisted-pair cable

Info

Publication number: CN213366252U
Application number: CN202020434463.XU
Authority: CN
Inventors: 赵东泰
Original assignee: Shaanxi Lvfu Cable Co ltd
Current assignee: Shaanxi Lvfu Cable Co ltd
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2021-06-04
Anticipated expiration: 2030-03-30

Abstract

The utility model relates to a pair twist cable technical field, concretely relates to parallel pair twist cable, it includes: insulated wires arranged in pairs and comprising an insulating layer surrounding the conductors; a covering resin layer contacting and covering an outside of the insulated wire; a shielding layer disposed in contact with an outside of the cover resin layer. The utility model discloses because a pair of insulated wire is covered by the covering resin layer, therefore the insulated wire is nearly not skew to the positional relationship between the shielding layer of arranging in the outside of insulating layer covers the resin layer and is stabilized, consequently reduces the output quantity of common mode for differential mode's input signal when transmitting differential signal.

Description

Parallel twisted-pair cable

Technical Field

The utility model relates to a pair twist cable technical field, concretely relates to parallel pair twist cable.

Background

The conventional twisted pair cable generally arranges an insulating tape in parallel with a drain wire, and longitudinally winds a metal tape around two insulating wires and then extrudes resin to the outside. When different signals are transmitted to the cable in parallel, when the distance between the conductive shielding tape and the signal line fluctuates along the length of the cable, the shielding effect of the conductive shielding tape on the signal line becomes unstable, and thus the output amount of the common mode is increased relative to the input signal of the differential mode.

SUMMERY OF THE UTILITY MODEL

The utility model provides a parallel pair twist cable reduces the output quantity of common mode for differential mode's input signal when transmitting differential signal.

In order to achieve the above object, the utility model provides a following technical scheme: a parallel twisted pair cable, comprising: insulated wires arranged in pairs and comprising an insulating layer surrounding the conductors; a covering resin layer contacting and covering an outside of the insulated wire; a shielding layer disposed in contact with an outside of the cover resin layer.

Preferably, the shielding layer includes a metal layer, and a pair of drain wires, each of the drain wires is in electrical contact with the metal layer of the shielding layer, and each of the drain wires is located outside the shielding layer.

Preferably, the insulated wires are mutually contacted and arranged in parallel; the cover resin layer is extruded from a resin, and has a seamless outer peripheral surface.

Preferably, the cross-sectional profile of the covering resin layer is oblong; the pair of drainage wires is arranged on a straight line which connects the centers of the two pairs of insulated wires and the insulated wire clamped between the two pairs of insulated wires; wherein the covering resin layer covers the insulating layer of the pair of insulated wires; each of the drain wires is in contact with the metal layer, which is disposed outside the circular arc portion of the covering resin layer, without being in contact with the insulated wire.

Preferably, a first resin forming the covering resin layer is different in performance from a second resin forming the insulating layers of the insulated wire pair, the first resin having a higher mechanical strength than the second resin, and the second resin having a lower dielectric constant than the first resin.

Preferably, the method further comprises the following steps: an insulating jacket layer disposed exterior to the shield layer and the drain wire.

The utility model discloses beneficial effect does: the second resin, i.e., the resin covering the resin layer, has high mechanical strength, and thus the insulated wire disposed therein can be easily protected. In addition, since the first resin, that is, the resin of the insulating layer has a low dielectric constant, the electrical characteristics between the signal conductors of the pair of insulated wires can be easily adjusted to a desired value. By appropriately adjusting the materials of the first resin and the second resin, the electrical characteristics, mechanical characteristics, outer diameter, and the like of the parallel pair cable can be adjusted to desired values. Since the drain wire is connected to a ground terminal or the like outside the parallel pair cable, the shield layer of the parallel pair cable can be easily grounded. When the drain wire is disposed outside the shield layer, the shield layer can be brought into close contact with the covering resin layer, and the impedance of the parallel cable can be stabilized. In the length direction of the cable. Since the pair of insulated wires is covered with the covering resin layer, the insulated wires are hardly deviated, and the positional relationship between the shielding layers disposed outside the insulating layer is stabilized. Therefore, the parallel pair cable can reduce the output amount in the common mode with respect to the input signal in the differential mode when transmitting the differential signal. In addition, in the case where the insulating sheath layer is provided outside the shield layer and the drain wire, the shield layer can be insulated to increase the mechanical strength of the cable and realize the parallel twisted pair having the waterproof function.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a sectional view of the overall structure of the present invention;

fig. 2 is a cross-sectional view of the cable of the present invention orthogonal to the length direction.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings of the present invention, and obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1 and 2, the parallel pair cable 1 includes: a pair of insulated electric wires 2 which are arranged in parallel in contact with each other and are not twisted; and a covering resin layer 3 covering the pair of insulated wires 2. The parallel twisted pair 1 further includes a shield layer 4 on the outer side of the covering resin layer 3, a drain wire 5 disposed on the outer side of the shield layer 4, and a sheath layer 6 provided around the shield layer.

The insulated wire 2 includes a signal conductor 21 disposed at the center, and an insulating layer 22 covers the periphery of the signal conductor 21. The signal conductor 21 is, for example, a single wire or a twisted pair, made of, for example, a conductor of copper or aluminum, a conductor of tin or silver plating, or the like. The insulating layer 22 is formed of a low-density polyethylene resin or the like.

The resin constituting the covering resin layer 3 (hereinafter also referred to as the second resin) may be a resin different from the resin constituting the insulating layer 22 (hereinafter also referred to as the first resin). The second resin may be a resin having electrical characteristics and mechanical strength different from those of the first resin.

For example, the first resin may have a higher mechanical strength than the second resin, and the second resin may have a lower dielectric constant than the first resin. For example, the first resin is a low-density polyethylene resin having excellent electrical characteristics, and the second resin is a high-density polyethylene resin having excellent mechanical strength. In this case, the second resin, i.e., the resin covering the resin layer 3 has a high mechanical strength, and therefore the insulated wire 2 disposed therein can be easily protected. Further, since the dielectric constant of the first resin, that is, the resin of the insulating layer 22 is low, the electrical characteristics between the signal conductors 21 of the pair of insulated wires 2 can be easily adjusted to a desired value.

On the other hand, as the first resin and the second resin, resins other than the above-described resins can be used. By appropriately adjusting the materials of the first resin and the second resin, the electrical characteristics, mechanical characteristics, outer diameter, and the like of the parallel pair cable 1 can be adjusted to desired values.

Further, the first resin and the second resin may be the same type of resin. In this case, since one resin is used, the cost can be reduced as compared with the case where a plurality of resins are used separately.

The shield layer 4 is formed of a resin tape having a metal layer, wherein the metal layer 4a such as copper or aluminum is adhered or evaporated to the metal tape such as PET or PET.

The thickness of the shielding layer 4 is, for example, about 10 μm to 50 μm, and the thickness of the metal layer 4a is, for example, about 0.1 μm to 20 μm. As the shield layer 4, a metal tape made of metal on both sides or a resin tape having a metal layer in which a metal tape is attached or deposited on a metal tape can be used.

Since the drain wire 5 is connected to a ground terminal or the like outside the parallel pair cable 1, the shield layer of the parallel pair cable 1 can be easily grounded. In addition, when the drain wire is disposed outside the shield layer 4, the shield layer 4 can be brought into close contact with the covering resin layer 3, and the impedance of the parallel cable 1 can be stabilized. In the length direction of the cable.

The sheath layer 6 is an insulating layer formed by wrapping a resin tape such as PET or PVC, for example. The sheath layer 6 may be formed of multiple layers. Further, the sheath layer 6 may be formed by extrusion molding of a thermoplastic resin such as polyethylene, polyvinyl chloride and fluorine resin,

since the pair of insulated wires 2 is covered with the covering resin layer 3, the insulated wires 2 are hardly deviated, and the positional relationship between the shielding layers 4 disposed outside the insulated layers 2 is stabilized by the covering resin layer 3. Therefore, the parallel pair cable 1 can reduce the output amount in the common mode with respect to the input signal in the differential mode when transmitting the differential signal.

In addition, in the case where the insulating sheath layer 6 is provided outside the shield layer 4 and the drain wire 5, the shield layer 4 can be insulated to increase the mechanical strength of the cable and realize the parallel twisted pair 1 having the waterproof function.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A parallel twisted pair cable, comprising:

insulated wires arranged in pairs and comprising an insulating layer surrounding the conductors;

a covering resin layer contacting and covering an outside of the insulated wire;

a shielding layer disposed in contact with an outer portion of the cover resin layer;

the shielding layer comprises a metal layer, and a pair of drainage lines, each drainage line is in electrical contact with the metal layer of the shielding layer, and each drainage line is positioned outside the shielding layer;

the insulated wires are mutually contacted and arranged in parallel; the covering resin layer is formed by extruding resin, and the covering resin layer has a seamless outer peripheral surface;

the cross-sectional profile of the covering resin layer is oblong; the pair of drainage wires is arranged on a straight line which connects the centers of the two pairs of insulated wires and the insulated wire clamped between the two pairs of insulated wires; wherein the covering resin layer covers the insulating layer of the pair of insulated wires; each of the drain wires is in contact with the metal layer, which is disposed outside the circular arc portion of the covering resin layer, without being in contact with the insulated wire.

2. A parallel twisted pair cable according to claim 1, wherein: the first resin forming the covering resin layer is different in performance from the second resin forming the insulating layers of the insulated wire pairs, the first resin having a higher mechanical strength than the second resin, and the second resin having a lower dielectric constant than the first resin.

3. A parallel twisted pair cable according to claim 2, wherein: further comprising: an insulating jacket layer disposed exterior to the shield layer and the drain wire.