CN101887780B - Multigroup lightning protection optical cable - Google Patents

Abstract

The invention discloses a multi-group lightning protection optical cable, which comprises: a cable formed by covering multiple groups of cable cores with an inner lining layer; and a coating layer covering the cable. The covering layer includes: a shielding layer shielding the cable; an outer sheath covering the shielding layer; and a grounding layer arranged between the inner lining layer and the shielding layer. The multi-group lightning protection optical cable of the present invention can prevent lightning from causing damage to communication equipment; and can effectively shield the interference of the electromagnetic field generated by the cable on other communication cable signals and the interference of the external electromagnetic field on the cable.

Description

Multiple sets of lightning protection optical cables

technical field

The invention relates to wire and cable technology, in particular to a multi-group lightning protection optical cable capable of lightning protection and transmission of optical signals and electric power.

Background technique

Based on the base station construction sites are mostly open, highland or mountainous area, the terrain is complex and the working environment is harsh, the equipment of the base station is easily damaged by lightning weather, the outdoor cables of the base station, especially in the northern area where the temperature is low in winter and directly exposed to ultraviolet rays, are prone to damage. Aging and damage will affect the work of the base station. The cable used as a communication base station should have certain shielding and anti-interference performance to ensure that its own electromagnetic field does not interfere with other signals and is not interfered by the external electromagnetic field on the cable core.

In addition, because the cable may be struck by lightning, once a lightning strike occurs, it will cause serious losses to communication facilities.

In addition, at present, communication base stations need to use electric cables and optical cables to transmit power and communication signals, which not only troubles laying, but also increases the cost of cables used by communication base stations.

Contents of the invention

The object of the present invention is to provide a multi-group lightning protection optical cable capable of lightning protection and transmission of optical and electrical signals.

The multi-group lightning protection optical cable of the present invention can also meet the special climate requirements required by communication base stations working outdoors.

According to the first aspect of the present invention, the above-mentioned multiple sets of lightning protection optical cables include:

Cables consisting of sets of cores covered by an inner liner; and

a coating covering the cable;

Wherein, the coating layer includes:

shielding the shielding layer of the cable;

an outer sheath enclosing the shield; and

A ground layer disposed between the inner lining layer and the shielding layer.

Wherein, the grounding layer is configured such that bundled copper wires twisted by multiple strands of copper wires obliquely wrap the inner lining layer, and the wrapping pitch is 18-28 times the outer diameter of the cable.

According to a second aspect of the present invention, the above-mentioned multiple sets of lightning protection optical cables include:

Multiple sets of cable cores covered with inner sheath;

covering the plurality of sets of cores to form an inner liner of the cable;

a shield for shielding said cable; and

an outer sheath covering the shielding layer;

It is characterized in that it also includes:

A grounded outer conductor disposed between the inner lining layer and the shielding layer.

Wherein, the grounding outer conductor is a bundle of twisted copper wires twisted by multiple strands of copper wires, and obliquely wraps the inner lining layer, and its wrapping pitch is 18 to 28 times the outer diameter of the cable.

In the first and second aspects above, the cable core includes:

At least two insulated wire cores;

at least one fiber optic unit; and

An inner sheath covering the insulated core and the optical fiber unit.

Wherein the optical fiber unit comprises: a tight-buffered optical fiber; a strength member; a reinforced steel core; and a protective layer covering the tight-buffered optical fiber, the strength member and the reinforced steel core; the tight-buffered optical fiber and the strength member twist fit on said reinforced steel core at the center.

Wherein the conductor of the insulated wire core is a bundle of twisted copper wires twisted with multiple strands of copper wires.

Wherein the shielding layer is formed by wrapping the outer conductor with a copper tape, and the wrapping overlap rate is above 25%.

Wherein the insulated wire core includes a conductor and an insulating layer covering the conductor, and the insulating layer is made of polyolefin material.

Wherein the inner sheath, the inner liner and the outer sheath are all made of polyolefin materials.

The reinforcing member and the protective layer are made of high-density PE, and a polyester tape is wrapped inside the protective layer.

The grounding layer or the grounding outer conductor of the present invention has good electrical conductivity and can effectively avoid lightning damage to cables.

The shielding layer of the invention can enable the cable to obtain better electromagnetic anti-interference ability.

The insulation layer and the inner sheath of the cable core of the present invention are made of low-smoke halogen-free polyolefin materials, which are flame-retardant and environment-friendly.

The outer sheath of the invention is made of cold-resistant low-smoke and halogen-free polyolefin material, which can ensure the normal operation of the cable in a low-temperature environment.

The inner sheath of the cable core of the present invention and the inner side of the outer sheath of the related cable are both wrapped with polyester materials with environmental protection performance.

In addition, the present invention also fills the cable core and cables with environmentally friendly filling materials such as PP fibers or rock wool ropes.

Compared with the prior art, the outer conductor that acts as a grounding wire in the present invention is located between the inner sheath and the shielding layer, and is composed of multiple strands of copper wires arranged obliquely, which effectively conducts instantaneous high voltage and prevents lightning from causing damage to communication equipment. cause damage. In addition, there is a copper tape shielding layer on the periphery of the outer conductor, which can effectively shield the interference of the electromagnetic field generated by the cable on other communication cable signals, and the interference of the external electromagnetic field on the cable. An optical fiber unit with a reinforced steel core is added inside the cable, which improves the mechanical pulling resistance of the optical cable part, and does not need to erect an additional optical cable to meet the needs of the base station, reducing the laying cost. The outer sheath is made of cold-resistant low-smoke and halogen-free polyolefin material, which is low-smoke and halogen-free, environmentally friendly, and resistant to ultraviolet rays and cold. The site works normally, its environmental adaptability is strong, it has multiple functions and low cost.

The details of the present invention will be specifically described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the schematic diagram showing the lightning protection optical cable first embodiment of the present invention; And

Fig. 2 is a schematic diagram showing a second embodiment of the lightning protection optical cable of the present invention.

Explanation of reference numerals: 1-light unit; 11-tight-buffered optical fiber; 12-reinforcing member; 13-strengthening steel core; 14-protective layer; 2-insulated core; 21-conductor; 22-insulating layer; 31-cable Line filler; 32-cable core filler; 4-inner lining; 5-grounding layer or outer conductor; 6-shielding layer; 7-inner sheath; 8-outer sheath.

Detailed ways

The lightning protection optical cable of the present invention is a lightning protection optical cable, or a lightning protection optical cable capable of simultaneously transmitting optical signals and electrical signals.

Fig. 1 shows the first embodiment of the lightning protection optical cable of the present invention, and Fig. 2 shows the second embodiment of the lightning protection optical cable of the present invention. In the first embodiment, the lightning protection optical cable has two sets of cores 9 . In the second embodiment, the lightning protection optical cable has three sets of cores 9 .

In a nutshell, the lightning protection optical cable of the present invention includes: a cable formed by covering a plurality of cable cores 9 with an inner liner 4 and a covering layer of the covered cable, wherein the covering layer includes:

shielding layer 6 shielding said cable;

an outer sheath 8 covering said shielding layer 6; and

The ground layer 5 for lightning protection is arranged between the inner lining layer 4 and the shielding layer 6 .

The grounding layer 5 is configured as follows: twisted copper wires twisted by multiple strands of copper wires obliquely wrap the inner lining layer 4, and the wrapping pitch is 18 to 28 times the outer diameter of the cable, so that Helps reduce the overall inductance value of the cable.

The ground layer 5 can also be configured as other conductive structures, such as a mesh ground layer.

In the specific embodiment shown in Fig. 1 and Fig. 2, multiple sets of lightning protection optical cables of the present invention include:

The cable core 9 covered with the inner sheath 7, the cable core 9 of the present invention can have multiple groups, such as two groups shown in Figure 1 or three groups shown in Figure 3, or more groups;

Coating multiple groups of cable cores 9 to form the inner liner 4 of the cable, the inner liner 4 is only used to form the cable here;

The shielding layer 6 for shielding the cable, the shielding layer 6 can not only shield the electromagnetic field generated by the cable core 9 itself so as not to interfere with other communication cable signals, but also can shield the interference of the external electromagnetic field on the cable core 9; and

The outer sheath 8 covering the shielding layer 6 is made of low-smoke and halogen-free polyolefin material, which is not only beneficial to environmental protection, but also resistant to cold and ultraviolet rays.

An important feature of the present invention is that it also includes: a grounding outer conductor 5 arranged between the inner lining layer 4 and the shielding layer 6 .

Theoretically, the grounding outer conductor 5 can be grounded at any place, but in practice, the grounding outer conductor 5 is preferably grounded in a manned or unmanned room. The outer conductor 5 can effectively conduct instantaneous high voltage, so as to prevent damage to communication equipment caused by lightning.

The grounding outer conductor 5 can be a bundle of twisted copper wires twisted by multi-strand copper wires, and wraps the inner lining layer 4 obliquely, for example, wraps the inner lining layer 4 leftward, so as to form a plurality of strands on the inner lining layer 4. Copper wire slanted. The winding pitch of the grounding outer conductor 5 is preferably 18 to 28 times the outer diameter of the cable.

Wherein the cable core 9 comprises: at least two insulated wire cores 2, in Fig. 1 and Fig. 2, insulated wire core 2 is two; at least one optical fiber unit 1, in Fig. 1 and Fig. 2, said optical fiber unit 1 There is only one; and the inner sheath 7 covering the insulated core 2 and the optical fiber unit 1 .

A feature of the present invention is that the optical fiber unit 1 is arranged in the cable core 9, so that there is no need to erect additional optical cables to meet the communication needs of the base station, and the laying cost can be reduced.

The optical fiber unit 1 of the present invention includes: at least one tight-buffered optical fiber 11, for example, two tight-buffered optical fibers 11 are used in Figures 1 and 2; at least one strength member 12, for example, in Figures 1 and 2, used Two reinforcements 12; a reinforcing steel core 13; and a protective layer 14 covering the tight-buffered optical fiber 11, the reinforcing member 12 and the reinforcing steel core 13; combined on the reinforced steel core 13 at the center. The tight-buffered optical fiber 11 and the strength member 12 are preferably arranged symmetrically in pairs as shown in FIG. 1 and FIG. 2 .

It is a feature of the present invention to add a reinforcing steel core 13 in the optical fiber unit 1, which can improve the mechanical pulling resistance of the optical cable part.

The conductor 21 of the insulated wire core of the present invention may also be bundled copper wire twisted by a plurality of strands of copper wire. For ease of manufacture, the wire diameters of the conductor 2 of the insulated core and the grounding outer conductor 5 are preferably the same.

The shielding layer 6 can be formed by wrapping the outer conductor 5 with, for example, a 0.1 mm copper tape, and the wrapping overlap rate is more than 25%. Such a shielding layer 6 can effectively shield the interference of the electromagnetic field generated by the cable on the signals of other communication cables, and the interference of the external electromagnetic field on the cable. The wrapping direction of the copper tape is opposite to that of the grounding outer conductor 5 .

On the other hand, since the shielding layer 6 made of copper tape directly wraps around the outer conductor 5, the shielding layer 6 and the outer conductor 5 are connected to form a grounding conductor, thereby enhancing the ability of the present invention to conduct instantaneous lightning high voltage. That is to say, since the two grounding conductors, the shielding layer 6 and the outer conductor 5, are used to induce lightning, the resistivity of the grounding conductor for lightning induction is greatly reduced, thereby improving the lightning protection effect.

The outer sheath 8 of the present invention is made of cold-resistant low-smoke and halogen-free polyolefin material, which is low-smoke and halogen-free, not only beneficial to environmental protection, but also resistant to ultraviolet rays and cold, and can ensure the normal operation of the cable in a low temperature environment.

The insulated wire core 2 of the present invention includes a conductor 21 and an insulating layer 22 covering the conductor 21, and the insulating layer 22 is also made of cross-linked polyolefin material.

In addition, the inner sheath 7, the inner lining layer 4 and the outer sheath 8 of the present invention can all be made of polyolefin materials, which are flame retardant and environmentally friendly. .

The reinforcing member 12 and the protective layer 14 are made of high-density PE, and the protective layer 14 is wrapped with a polyester tape.

The inner side of the inner liner 4 and the outer sheath 8 is wrapped with an environmentally friendly polyester material to wrap the cable.

In order to strengthen the strength of the cable, a filling material 31 such as PP fiber or rock wool rope is filled in the cable.

Likewise, in order to strengthen the strength of the cable core 9 , the cable core 9 is filled with a filling material 32 such as PP fiber or rock wool rope.

Although the present invention has been described in detail above, the present invention is not limited thereto, and various modifications can be made by those skilled in the art based on the principle of the present invention. Therefore, any modifications made according to the principles of the present invention should be understood as falling within the protection scope of the present invention.

Claims (7)

1. multigroup lightning protection optical cable comprises:

Coat by inner covering (4) cable that many group cable cores (9) consist of; And

The coating of the described cable of coating;

Wherein, described coating comprises:

Shield the ground shield (6) of described cable;

Coat the oversheath (8) of described ground shield (6); With

Be arranged on and be used for the ground plane (5) of lightning protection between described inner covering (4) and described ground shield (6);

Wherein, described ground plane (5) is configured to: by the bundle strand oblique wrapped described inner covering of copper wire (4) of stranded copper wire bundle strand, its lay of lapping is 18～28 times of described cable external diameter;

Wherein, described ground shield (6) adopts the wrapped described ground plane of copper strips (5), and wrapped Duplication is more than 25%;

Wherein, ground plane (5) causes damage to communication equipment to avoid thunder and lightning people or unmanned machine room ground connection are arranged.

2. multigroup lightning protection optical cable comprises:

Many groups comprise the cable core (9) of the outer inner sheath (7) that covers;

Coat described many group cable cores (9) to form the inner covering (4) of cable;

Be used for shielding the ground shield (6) of described cable; With

Coat the oversheath (8) of described ground shield (6);

Also comprise:

Be arranged on and be used for the ground plane (5) of lightning protection between described inner covering (4) and described ground shield (6);

Wherein, described ground plane (5) is the bundle strand copper wire of stranded copper wire bundle strand, and oblique wrapped described inner covering (4), and its lay of lapping is 18～28 times of described cable external diameter;

Wherein, described ground shield (6) adopts the wrapped described ground plane of copper strips (5), and wrapped Duplication is more than 25%;

Wherein, ground plane (5) causes damage to communication equipment to avoid thunder and lightning people or unmanned machine room ground connection are arranged.

3. lightning-proof optical cable according to claim 1 and 2, wherein said cable core (9) comprising:

At least two thoroughly do away with edge core (2); And

At least one fiber unit (1); And

Coat the inner sheath (7) of described insulated wire cores (2) and fiber unit (1).

4. lightning-proof optical cable according to claim 3, wherein said fiber unit (1) comprising:

Tight tube fiber (11);

Reinforcement (12);

Strengthen steel core (13); And

Coat the protective layer (14) of described tight tube fiber (11), reinforcement (12) and described reinforcement steel core (13);

Wherein said tight tube fiber (11) and described reinforcement (12) are stranded on the described reinforcement steel core (13) that is positioned at the center.

5. lightning-proof optical cable according to claim 4, wherein said insulated wire cores (2) comprise conductor (21) and coat the insulating barrier (22) of described conductor (21), and described insulating barrier (22) adopts polyolefine material.

6. lightning-proof optical cable according to claim 5, the conductor of wherein said insulated wire cores (21) are the bundle strand copper wires of stranded copper wire bundle strand.

7. lightning-proof optical cable according to claim 6, wherein said inner sheath (7), inner covering (4) and oversheath (8) all adopt the TPO material.

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