CN210182131U

CN210182131U - Control cable

Info

Publication number: CN210182131U
Application number: CN201921340084.8U
Authority: CN
Inventors: Zhisheng Hu; 胡掷声; Xiaoli Ou; 欧晓莉; Shiwen Zheng; 郑诗雯
Original assignee: Wenzhou Net Wire & Cable Co Ltd
Current assignee: Wenzhou Net Wire & Cable Co Ltd
Priority date: 2019-08-19
Filing date: 2019-08-19
Publication date: 2020-03-24
Anticipated expiration: 2029-08-19

Abstract

The utility model relates to the technical field of cables, and aims to provide a control cable, which comprises a cable sheath and a plurality of wire groups arranged in the cable sheath; the wire group comprises two or more than two wires which are mutually twisted and a composite shielding layer which wraps the outer sides of the twisted wires; the composite shielding layer inner side is provided with two drainage wires, two be connected with the connecting band that flexible material made between the drainage wire, the connecting band extends along the length direction of drainage wire to be sandwiched between two adjacent wires. Utilize two wires to press from both sides the connecting band tightly in the centre for the connecting band is the heliciform along with the transposition of wire and extends, and two drainage wires receive the restraint of connecting band, can be the same heliciform along with the wire and extend, make the surface of composite shielding layer more roundly, and reduced the air gap between composite shielding layer and the wire, thereby avoid the electric field to concentrate, and reduce partial discharge.

Description

Control cable

Technical Field

The utility model relates to a cable technical field, in particular to control cable.

Background

The control cable is used for transmitting control signals in a power system, and a cable shielding layer is required to be arranged in the cable, so that the influence of an external electromagnetic field on a communication line is reduced. The so-called "shielding" in the cable structure is essentially a measure for improving the electric field distribution, and the shielding layer is equipotential with the conductor being shielded and in good contact with the insulating layer, thereby avoiding partial discharges between the conductor and the insulating layer. And the shielding layer needs to be grounded through the drainage wire, so that an external interference signal can be guided into the ground by the shielding layer, and the interference of the interference signal entering the inner-layer conductor is avoided, and the loss of a transmission signal is reduced.

At present, chinese patent document No. CN202332371U in the prior art discloses a copper strip separate-shielding and total-shielding flame-retardant computer cable, which includes a wire and a cable core outer sheath, wherein the wire includes an insulating layer and a conductor in the insulating layer, the cable core includes a plurality of wire sets, the wire sets are formed by twisting two wires, three wires or four wires to form a pair wire and an externally-braided copper strip separate-shielding layer, and a drainage wire capable of grounding is further disposed on the inner side of the copper strip separate-shielding layer, for guiding the interference signal absorbed on the copper strip separate-shielding layer to the ground.

However, the surfaces of two or more twisted wires can form spiral depressions, the drainage wire and the wires are arranged in the copper strip separate shielding layer together, and the drainage wire extends along the length direction of the cable and contacts with the surfaces of the wires at intervals, so that a large number of air gaps are formed in the copper strip separate shielding layer, an electric field is concentrated to form partial discharge, and the shielding effect of the copper strip separate shielding layer is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a control cable can reduce the intraformational air gap of shielding to reduce partial discharge.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a control cable comprises a cable sheath and a plurality of wire groups arranged in the cable sheath; the wire group comprises two or more than two wires which are mutually twisted and a composite shielding layer which wraps the outer sides of the twisted wires; two drainage wires are arranged on the inner side of the composite shielding layer and extend in the same direction along the twisting direction of the conducting wire; a connecting belt made of flexible materials is connected between the two drainage wires, extends along the length direction of the drainage wires and is clamped between two adjacent wires; the thickness of the connecting band is smaller than the diameter of the drainage wire.

By adopting the technical scheme, the connecting belt is clamped between the two leads, so that the connecting belt extends spirally along with the twisting of the leads, the two drainage wires are restrained by the connecting belt and extend spirally along with the leads in the same way, and the drainage wires can be attached to the depressions formed by twisting the drainage wires with the surfaces of the leads, so that the surface of the composite shielding layer is more round, air gaps between the composite shielding layer and the leads are reduced, and partial discharge is reduced; and the drainage wires on the two sides are difficult to pass through the two adjacent wires, so that the drainage wires and the connecting belt can be mutually limited, and the drainage wires and the connecting belt are prevented from being shifted.

The utility model discloses further set up to: the wire comprises a conductor, an insulating layer and a single-wire shielding layer, wherein the insulating layer wraps the outer side of the conductor, and the single-wire shielding layer wraps the outer side of the insulating layer.

By adopting the technical scheme, each wire is shielded and protected by using the single-wire shielding layer, so that the wires which are twisted with each other are prevented from being influenced with each other; and the single-wire shielding layer is contacted with the composite shielding layer, and the drainage wire is closely contacted with the single-wire shielding layer, so that the current formed on the surfaces of the composite shielding layer and the single-wire shielding layer can be led into the ground through the drainage wire.

The utility model discloses further set up to: the connecting band is a conductive band made of metal.

Through adopting above-mentioned technical scheme, utilize the connecting band of metal material to make can switch on each other between the single line shielding layer that is cut apart by the connecting band to the electrically conductive effect of reinforcing drainage wire.

The utility model discloses further set up to: the two sides of the connecting belt are integrally formed with annular fixing sleeves, and the drainage wire penetrates through the fixing sleeves.

Through adopting above-mentioned technical scheme, utilize fixed cover to fix the drainage wire, strengthen the joint strength between drainage wire and the connecting band, and fixed cover is electrically conductive material with the connecting band.

The utility model discloses further set up to: three mutually twisted conducting wires are arranged in the composite shielding layer, and the three conducting wires are closely arranged in a shape of a Chinese character 'pin'; the connecting band passes through between the two leads, closely extends to the surface of one lead and then passes out from the closely attached lead and the other lead; and the two drainage wires are respectively clung to the adjacent wires.

By adopting the technical scheme, the three conducting wires are tightly attached to the connecting belt, so that conduction is realized; and two drainage wires receive the restraint of connecting band, hug closely respectively on the both sides outer wall of wire, realize spacing effect when having strengthened electrically conductive effect, avoid the skew of drainage wire.

The utility model discloses further set up to: four mutually twisted wires are arranged in the composite shielding layer, and the four wires are closely arranged in a Chinese character tian shape; the connecting band passes through the middle of two groups of wires which are arranged side by side.

By adopting the technical scheme, the four wires are divided into two groups to clamp the connecting belt in the middle, and each wire can be tightly contacted with the connecting belt to realize conduction; and two drainage wires receive the restraint of connecting band, hug closely respectively on the both ends outer wall of wire, realize spacing effect when having strengthened electrically conductive effect, avoid the skew of drainage wire.

The utility model discloses further set up to: and PP netted filling ropes are filled in gaps outside the wire groups in the cable sheath.

Through adopting above-mentioned technical scheme, utilize the netted filling rope of PP to fill the space in the cable sheath for cable stable in structure, become roundly.

The utility model discloses further set up to: the composite shielding layer comprises an outer shielding layer, a wrapping protective layer and an inner shielding layer from outside to inside.

By adopting the technical scheme, the shielding effect is enhanced by utilizing the multiple shielding layers, and the wrapping protective layer has the effects of high and low temperature resistance and flame retardance; the single line shielding layer on wire surface switches on with the internal shield layer contact realization, and can set up the drainage wire in the cable sheath equally, and this drainage wire then contacts with the external shield layer, further reinforcing shielding effect.

To sum up, the beneficial effects of the utility model are that:

1. the connecting belt is clamped between the two leads, so that the connecting belt extends spirally along with the twisting of the leads, and the two drainage wires are restrained by the connecting belt and extend spirally along with the leads in the same way, so that the surface of the composite shielding layer is more round, air gaps between the composite shielding layer and the leads are reduced, and partial discharge is reduced; the drainage wires on the two sides are difficult to penetrate through the two adjacent wires, so that the drainage wires and the connecting belt can be mutually limited, and the drainage wires and the connecting belt are prevented from being shifted;

2. each wire is shielded and protected by using the single-wire shielding layer, so that the wires which are twisted with each other are prevented from being influenced with each other; and the single-wire shielding layer is contacted with the composite shielding layer, and the drainage wire is closely contacted with the single-wire shielding layer, so that the current formed on the surfaces of the composite shielding layer and the single-wire shielding layer can be led into the ground through the drainage wire.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic structural diagram of the two-wire group of the present invention;

fig. 3 is a schematic structural diagram of a three-wire group according to the present invention;

fig. 4 is a schematic structural diagram of a four-wire group according to the present invention.

Reference numerals: 1. a cable jacket; 11. an outer sheath; 12. a sheath shielding layer; 13. an inner sheath; 2. a wire set; 21. a wire; 211. a conductor; 212. an insulating layer; 213. a single wire shielding layer; 22. a composite shielding layer; 221. an outer shield layer; 222. wrapping a protective layer; 223. an inner shield layer; 3. a drainage wire; 31. a connecting belt; 32. and (4) fixing sleeves.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment discloses a control cable, as shown in fig. 1, including a cable sheath 1 and a plurality of wire sets 2 arranged in the cable sheath 1, where the wire sets 2 include two or more wires 21 twisted with each other and a composite shielding layer 22 wrapped outside the twisted wires 21, and a gap in the cable sheath 1 outside the composite shielding layer 22 is filled with a PP mesh filling rope, so that the cable has a stable structure and becomes round.

As shown in fig. 1, the cable sheath 1 includes an outer sheath 11, a sheath shielding layer 12 and an inner sheath 13 from outside to inside; the composite shielding layer 22 comprises an outer shielding layer 221, a wrapping protective layer 222 and an inner shielding layer 223 from outside to inside; the conductive wire 21 includes a conductor 211, an insulating layer 212 covering the conductor 211, and a single-wire shielding layer 213 covering the insulating layer 212. The shielding layers are all copper woven meshes, so that interference current and interference signals can be absorbed and conducted, external interference can be reduced by using the multilayer composite shielding layer 22, and the single wire shielding layer 213 is used for shielding and protecting the single wire 21 to prevent mutual influence between the wires 21 which are twisted with each other; the wrapping protection layer 222 has high and low temperature resistance and flame retardant effect.

As shown in fig. 1, two drainage wires 3 capable of being grounded are arranged inside the composite shielding layer 22, a connecting band 31 formed by weaving copper is connected between the two drainage wires 3, two sides of the connecting band 31 are respectively woven to form a fixing sleeve 32, and the drainage wires 3 penetrate through the fixing sleeve 32. The connecting band 31 has better flexibility, can be the heliciform along with the transposition of wire 21 and extend by being pressed from both sides between two adjacent wires 21, and two drainage wires 3 receive the restraint of connecting band 31 and fixed cover 32, can be the same heliciform along with wire 21 and extend, and drainage wire 3 laminating in the sunken of twisting formation with wire 21 surface, make the surface of compound shielding layer 22 more round, and reduced the air gap between compound shielding layer 22 and the wire 21, thereby avoid electric field concentration, reduce partial discharge. And the thickness of the connecting band 31 is smaller than the diameter of the drainage wire 3, and the leads 21 are tightly attached, so that the drainage wires 3 on two sides are difficult to pass through the two adjacent leads 21, and can be mutually limited with the connecting band 31, and the position deviation between the drainage wire 3 and the connecting band 31 is avoided.

As shown in fig. 1, the single-wire shielding layer 213 and the inner shielding layer 223 are in contact with each other, the drainage wire 3 is in close contact with the single-wire shielding layer 213, and the connecting band 31 enables the single-wire shielding layers 213 separated by the connecting band 31 to be conducted with each other, so that the interference current and the interference signal formed on the surfaces of the inner shielding layer 223 and the single-wire shielding layer 213 can be guided to the ground through the drainage wire 3; and the same can set up drainage wire 3 in the cable sheath 1, and this drainage wire 3 then contacts with outer shielding layer 221, further strengthens shielding effect.

The present embodiment takes three different cord sets 2 as an example, and describes the arrangement of the drainage cords 3 and the connecting tapes 31 in the cord sets 2. As shown in fig. 1, the three wire groups 2 are two wire groups: two wires 21 are twisted with each other, a three-wire group: three wires 21 twisted with each other, a four-wire group: the four wires 21 are twisted with each other.

As shown in fig. 2, in the double-wire group, the connecting band 31 is sandwiched between the two wires 21 and tightly attached to the connecting band 31 to realize conduction, and the two drainage wires 3 are constrained by the connecting band 31 and tightly attached to the outer walls of the two sides of the wires 21 respectively, so that the limiting effect is realized while the conducting effect is enhanced, and the position deviation of the drainage wires 3 is avoided.

As shown in fig. 3, in the three-wire set, the three wires 21 are closely arranged in a delta shape, and the connecting band 31 passes through between the two wires 21 and closely contacts with the surface of one of the wires 21 to extend, and then passes through between the closely contacting wire 21 and the other wire 21, so that the three wires 21 are closely attached to the connecting band 31 to realize conduction; and the two drainage wires 3 are restrained by the connecting belt 31 and respectively cling to the outer walls of the two sides of the lead 21.

As shown in fig. 4, in the four-wire group, four wires 21 are closely arranged in a shape of a Chinese character tian, the four wires 21 are divided into two groups side by side to clamp the connecting belt 31 therebetween, and each wire 21 can be closely contacted with the connecting belt 31 to realize conduction; and the two drainage wires 3 are restrained by the connecting belt 31 and respectively cling to the outer walls of the leads 21 at the two ends.

In summary, the cord set 2 may also be a five-wire cord set, a six-wire cord set or a cord set 2 formed by twisting more wires 21, and the connecting strap 31 only needs to be clamped between two wires 21 to achieve constraint, so that the drainage wire 3 can extend spirally along the twisting direction. The width of the connecting band 31 can be selected according to the number of the twisted wires 21, so that the drainage wires 3 at the two ends can be attached to the surfaces of the wires 21, and the stability of the structure is enhanced.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. A control cable comprises a cable sheath (1) and a plurality of wire groups (2) arranged in the cable sheath (1); the wire group (2) comprises two or more than two wires (21) which are mutually twisted and a composite shielding layer (22) which wraps the outer sides of the twisted wires (21); the method is characterized in that: two drainage wires (3) are arranged on the inner side of the composite shielding layer (22), and the drainage wires (3) extend in the same direction along the twisting direction of the lead (21); a connecting belt (31) made of flexible materials is connected between the two drainage wires (3), the connecting belt (31) extends along the length direction of the drainage wires (3) and is clamped between two adjacent leads (21); the thickness of the connecting band (31) is smaller than the diameter of the drainage wire (3).

2. The control cable of claim 1, wherein: the lead (21) comprises a conductor (211), an insulating layer (212) wrapped on the outer side of the conductor (211), and a single-wire shielding layer (213) wrapped on the outer side of the insulating layer (212).

3. The control cable of claim 2, wherein: the connecting band (31) is a conductive band made of metal.

4. The control cable of claim 3, wherein: the both sides integrated into one piece of connecting band (31) have annular fixed cover (32), drainage wire (3) wear to locate in fixed cover (32).

5. The control cable of claim 1, wherein: three mutually twisted conducting wires (21) are arranged in the composite shielding layer (22), and the three conducting wires (21) are closely arranged in a shape of Chinese character 'pin'; the connecting band (31) penetrates through another gap after passing through and bending between the two leads (21).

6. The control cable of claim 1, wherein: four mutually twisted leads (21) are arranged in the composite shielding layer (22), and the four leads (21) are closely arranged in a Chinese character 'tian'; the connecting belt (31) penetrates through the middle of two groups of wires (21) which are arranged side by side.

7. The control cable of claim 1, wherein: PP netted filling ropes are filled in gaps on the outer side of the wire group (2) in the cable sheath (1).

8. The control cable of claim 1, wherein: the composite shielding layer (22) comprises an outer shielding layer (221), a wrapping protective layer (222) and an inner shielding layer (223) from outside to inside.