Coaxial cable and cable reel collector box using the coaxial cable

Abstract

The present invention discloses a coaxial cable, comprising a first core, a second core, a third core and a fourth core coaxially arranged from the inside to the outside, and the two ends of the first core, the second core, the third core and the fourth core are arranged in sequence along the axial direction; the coaxial cable also includes a plurality of insulating layers, and the insulating layers respectively include a first insulating layer arranged between the first core and the second core, a second insulating layer arranged between the second core and the third core, a third insulating layer arranged between the third core and the fourth core, and a fourth insulating layer arranged outside the fourth core, and each insulating layer extends to both ends so that the two ends of the first core, the second core, the third core and the fourth core are exposed from each insulating layer. The present invention also discloses a cable reel collector box using a coaxial cable. The present invention fixes each phase in a coaxial manner and arranges the two ends of each phase at intervals to avoid contact discharge, ensure that flashover does not occur between phases, and fully ensure good insulation of the cable.

Description

[Technical field]

[0001] The invention relates to the technical field of high-voltage current collectors, and in particular to a coaxial cable and a cable reel current collector box using the coaxial cable. [Background technology]

[0002] Reel cables are used in reel systems for cable winding and unwinding, such as gantry cranes in large-scale logistics loading and unloading, bucket wheel cranes in mining operations, and large-scale lifting machinery and equipment used in lifting and hoisting projects. Usually, the outlet terminals of the reel cables are connected to the wiring rings of each phase in the collector box. In order to ensure the creepage distance of the high voltage to the ground, some cables connected to the collector box need to be stripped of the insulation and outer shielding. When the equipment is frequently winding and unwinding the cables, the phase-to-phase distance between the cables in the collector box is reduced or the phases touch each other. Due to the stripping of the outer shielding of the insulation, the phase-to-phase insulation is charged, and the phase-to-phase safety distance is reduced, which may cause phase-to-phase discharge, or the cable insulation may touch the phase-to-phase supporting insulator, resulting in single-phase discharge to the insulator or even flashover, which in turn burns the cable insulation surface and reduces the service life of the cable.

[0003] In view of this, it is necessary to provide a coaxial cable and a cable reel collector box using the coaxial cable to overcome the above-mentioned defects. [Summary of the invention]

[0004] The object of the present invention is to provide a coaxial cable and a cable reel collector box using the coaxial cable, which can effectively prevent the phases in the collector box from touching each other and solve the problem of phase-to-phase flashover.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a coaxial cable, comprising a first core, a second core, a third core and a fourth core coaxially arranged from the inside to the outside, and the two ends of the first core, the second core, the third core and the fourth core are arranged in sequence along the axial direction; the coaxial cable also includes a plurality of insulating layers, the insulating layers respectively include a first insulating layer arranged between the first core and the second core, a second insulating layer arranged between the second core and the third core, a third insulating layer arranged between the third core and the fourth core, and a fourth insulating layer arranged outside the fourth core, each insulating layer extends to both ends so that the two ends of the first core, the second core, the third core and the fourth core are exposed from each insulating layer.

[0006] In a preferred embodiment, the first insulating layer, the second insulating layer, the third insulating layer and the fourth insulating layer extend to form steps, and portions of the first insulating layer, the second insulating layer, the third insulating layer and the fourth insulating layer corresponding to the steps are also covered with a stress layer.

[0007] In a preferred embodiment, the coaxial cable includes a head end and a tail end far away from the head end, and the first core, the second core, the third core and the fourth core are equidistantly arranged at their ends near the head end, and the first core, the second core, the third core and the fourth core are equidistantly arranged at their ends near the tail end.

[0008] In a preferred embodiment, the first core, the second core, the third core and the fourth core are respectively an A phase line, a B phase line, a C phase line and a ground line.

[0009] In order to achieve the above-mentioned purpose, the present invention also provides a cable reel collector box using a coaxial cable, comprising a collector box, a plurality of power taking rings, an insulating sleeve and the above-mentioned coaxial cable; the power taking ring is arranged in the collector box, and the plurality of power taking rings are arranged in sequence and at equal intervals along the axial direction of the collector box, one end of the coaxial cable extends into the collector box and passes through the plurality of power taking rings, the ends of the first core, the second core and the third core located at the same end are respectively conductively connected to a corresponding power taking ring, and the other end of the coaxial cable extends out of the collector box and is sleeved with the insulating sleeve.

[0010] In a preferred embodiment, the insulating sleeve includes a main body and a support sleeve connected to the main body, the main body is sleeved on the coaxial cable, and the support sleeve corresponds to the end of the first core, the second core, the third core or the fourth core; a conductive connecting rod is provided in the support sleeve, and the conductive connecting rod includes a terminal for connecting to a reel cable, the terminal extends out of the support sleeve, and one end of the conductive connecting rod away from the terminal is connected to the end of the first core, the second core, the third core or the fourth core.

[0011] In a preferred embodiment, there are multiple support sleeves, and the multiple support sleeves are evenly spaced around the axis of the main body.

[0012] In a preferred embodiment, the fourth core is a ground wire, and one end of the fourth core close to the insulating sleeve is used to connect to the ground wire of the reel cable or directly grounded, and one end of the fourth core close to the insulating sleeve is connected to the collector box.

[0013] In a preferred embodiment, ends of the first core, the second core and the third core away from the insulating sleeve are all sleeved with a conductive bracket, and the conductive bracket includes at least one conductive bar for connecting the power extraction ring.

[0014] In a preferred embodiment, the conductive strip extends radially along the coaxial cable, a screw hole is provided at one end of the conductive strip close to the power taking ring, and the conductive strip is fastened to the power taking ring by means of locking screws.

[0015] The beneficial effects of the present invention are as follows: compared with the prior art, each phase is fixed in a coaxial manner and the two ends of each phase are spaced apart, which can avoid touch discharge in the access reel system, increase the phase-to-phase creepage distance, ensure that no flashover occurs between the phases, fully ensure that the insulation of the cable is good, and increase the service life of the cable.

[0016] In order to make the above-mentioned objects, features and advantages of the invention more obvious and easy to understand, the preferred embodiments of the present invention are specifically cited below and described in detail with reference to the attached drawings.

Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A three-dimensional structural diagram of a coaxial cable provided in a preferred embodiment of the present invention;

[0019] Figure 2 A schematic structural diagram of a cable reel collector box using a coaxial cable provided in a preferred embodiment of the present invention;

[0020] Figure 3 A three-dimensional structural diagram of an insulating sleeve provided in a preferred embodiment of the present invention.

[0021] Explanation of the accompanying drawings: coaxial cable 100, first core 10, second core 20, third core 30, fourth core 40, insulation layer 50, first insulation layer 51, second insulation layer 52, third insulation layer 53, fourth insulation layer 54, head end 101, tail end 102, cable reel collector box 1000, collector box 200, power ring 300, insulation sleeve 400, main body 410, support sleeve 420, conductive connecting rod 430, terminal 431, conductive bracket 500, conductive strip 510, screw hole 511. [Specific implementation method]

[0022] In order to make the purpose, technical solution and beneficial technical effect of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining the present invention, not for limiting the present invention.

[0023] See also Figure 1 The embodiment of the present invention provides a coaxial cable 100, which is applied to a reel system to connect reel cables. The coaxial cable 100 includes a first core 10, a second core 20, a third core 30 and a fourth core 40 coaxially arranged from inside to outside, and the two ends of the first core 10, the second core 20, the third core 30 and the fourth core 40 are sequentially spaced along the axial direction.

[0024] The coaxial cable 100 further includes a plurality of insulating layers 50 for separating the wire cores. Specifically, the insulating layers 50 include a first insulating layer 51 disposed between the first wire core 10 and the second wire core 20, a second insulating layer 52 disposed between the second wire core 20 and the third wire core 30, a third insulating layer 53 disposed between the third wire core 30 and the fourth wire core 40, and a fourth insulating layer 54 disposed outside the fourth wire core 40. Each insulating layer 50 extends to both ends so that both ends of the first wire core 10, the second wire core 20, the third wire core 30 and the fourth wire core 40 are exposed from each insulating layer 50. In this embodiment, the lengths of the first wire core 10, the second wire core 20, the third wire core 30 and the fourth wire core 40 are gradually reduced, and the insulating layer 50 can be made of cross-linked polyethylene material, which has excellent electrical and mechanical properties.

[0025] Preferably, the first insulating layer 51, the second insulating layer 52, the third insulating layer 53, and the fourth insulating layer 54 extend to form steps, and the parts of the first insulating layer 51, the second insulating layer 52, the third insulating layer 53, and the fourth insulating layer 54 corresponding to the steps are also covered with a stress layer (not shown) to ensure stress dispersion, reduce electric field concentration, and ensure the reliability of the operation of the coaxial cable 100.

[0026] Further, the coaxial cable 100 includes a head end 101 and a tail end 102 far away from the head end 101, and the ends of the first core 10, the second core 20, the third core 30 and the fourth core 40 close to the head end 101 are arranged at an equal distance, and the ends of the first core 10, the second core 20, the third core 30 and the fourth core 40 close to the tail end 102 are arranged at an equal distance. In this embodiment, the distance between the ends of the first core 10, the second core 20, the third core 30 and the fourth core 40 close to the head end 101 can be set to 20 cm, and the distance between the ends of the first core 10, the second core 20, the third core 30 and the fourth core 40 close to the tail end 102 can be set to 20 cm to ensure the creepage distance between the phases, which can be set according to the distance requirements.

[0027] Preferably, the first core 10, the second core 20, the third core 30 and the fourth core 40 are respectively an A phase line, a B phase line, a C phase line and a ground line, and can be adjusted and arranged in sequence according to the phase sequence.

[0028] Please also read Figure 2 and Figure 3 The embodiment of the present invention further provides a cable reel collector box 1000 using a coaxial cable 100, including a collector box 200, a plurality of power rings 300, an insulating sleeve 400 and the coaxial cable 100 of the above embodiment.

[0029] Specifically, the power ring 300 is arranged in the collector box 200, and multiple power rings 300 are arranged in sequence at equal intervals along the axial direction of the collector box 200. One end of the coaxial cable 100 extends into the collector box 200 and passes through multiple power rings 300. The ends of the first core 10, the second core 20 and the third core 30 located at the same end are respectively conductively connected to a corresponding power ring 300. The other end of the coaxial cable 100 extends out of the collector box 200 and is sleeved with an insulating sleeve 400.

[0030] Specifically, the insulating sleeve 400 includes a main body 410 and a support sleeve 420 connected to the main body 410. The main body 410 is sleeved on the coaxial cable 100, and the support sleeve 420 corresponds to the end of the first core 10, the second core 20, the third core 30 or the fourth core 40. In this embodiment, the main body 410 is cylindrical, and the support sleeve 420 is arranged perpendicular to the axial direction of the main body 410. Specifically, each core of the coaxial cable 100 can be connected through a conductive member and connected to the output end of the reel cable through the support sleeve 420.

[0031] In this embodiment, a conductive connecting rod 430 is provided in the support sleeve 420, and the conductive connecting rod 430 includes a terminal 431 for connecting to the reel cable, and the terminal 431 extends out of the support sleeve 420, and the end of the conductive connecting rod 430 away from the terminal 431 is connected to the end of the first core 10, the second core 20, the third core 30 or the fourth core 40. Specifically, the end of the conductive connecting rod 430 away from the terminal 431 is sleeved on the end of the first core 10, the second core 20, the third core 30 or the fourth core 40 to achieve conductive connection. It can be understood that the terminal 431 can be crimped together with the reel cable, and the crimping point is insulated and sealed to avoid contact discharge, while ensuring the creepage distance between phases.

[0032] Preferably, there are multiple support sleeves 420, and the multiple support sleeves 420 are evenly spaced around the axis of the main body 410, which is convenient for connecting to an external reel cable and does not interfere with each other during frequent cable winding and unwinding.

[0033] Preferably, the fourth core 40 is a ground wire, and one end of the fourth core 40 close to the insulating sleeve 400 is used to connect to the ground wire of the reel cable or directly grounded, and one end of the fourth core 40 away from the insulating sleeve 400 is connected to the collector box 200. It can be understood that the end of the fourth core 40 away from the insulating sleeve 400 is connected to the collector box 200 through a wire; when the reel cable is a three-phase four-wire cable, the end of the fourth core 40 close to the insulating sleeve 400 is connected to the ground wire of the cable, and when the reel cable is a three-phase three-wire cable, the end of the fourth core 40 close to the insulating sleeve 400 is directly grounded.

[0034] The ends of the first wire core 10, the second wire core 20 and the third wire core 30 away from the insulating sleeve 400 are all sleeved with a conductive bracket 500, and the conductive connection between the power ring 300 and each wire core is realized through the conductive bracket 500. In this embodiment, the conductive bracket 500 and the power ring 300 are both made of copper material, and the power ring 300 is in a circular ring shape. The multiple power rings 300 are arranged at equal intervals and do not contact each other or the collector box 200, meeting the cable phase distance requirements.

[0035] Furthermore, the conductive support 500 includes at least one conductive strip 510 for connecting the power ring 300. The conductive strip 510 extends radially along the coaxial cable 100, and a screw hole 511 is provided at one end of the conductive strip 510 close to the power ring 300. The conductive strip 510 is fastened to the power ring 300 by a locking screw. Preferably, the number of the conductive strips 510 is three and they are evenly spaced along the radial direction of the coaxial cable 100 to ensure good electrical contact.

[0036] The coaxial cable 100 and the cable reel collector box 1000 in the embodiment of the present invention, by fixing each phase in a coaxial manner and arranging the two ends of each phase at intervals, can avoid touch discharge when connected to the reel system, increase the creepage distance between phases, ensure that no flashover occurs between the phases, fully ensure that the insulation of the cable is good, and increase the service life of the cable.

[0037] The present invention is not limited to what is described in the specification and implementation modes, and therefore additional advantages and modifications can be easily realized by those skilled in the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrative examples shown and described herein.

Claims

1. A coaxial cable used in a reel system to connect reel cables, characterized in that: It comprises a first core, a second core, a third core and a fourth core which are coaxially arranged from the inside to the outside, and the two ends of the first core, the second core, the third core and the fourth core are arranged in sequence along the axial direction at intervals; the coaxial cable also comprises a plurality of insulating layers, and the insulating layers respectively comprise a first insulating layer arranged between the first core and the second core, a second insulating layer arranged between the second core and the third core, a third insulating layer arranged between the third core and the fourth core, and a fourth insulating layer arranged outside the fourth core, and each insulating layer respectively extends to both ends so that the two ends of the first core, the second core, the third core and the fourth core are exposed from each insulating layer, one end of the coaxial cable extends into the collector box and passes through a plurality of power-taking rings, the ends of the first core, the second core and the third core located at the same end are respectively conductively connected to a corresponding power-taking ring, and the other end of the coaxial cable extends out of the collector box and is sleeved with an insulating sleeve; The insulating sleeve includes a main body and a support sleeve connected to the main body, the main body is sleeved on the coaxial cable, and the support sleeve corresponds to the end of the first core, the second core, the third core or the fourth core.

2. The coaxial cable according to claim 1, characterized in that: The first insulating layer, the second insulating layer, the third insulating layer and the fourth insulating layer extend to form a step, and portions of the first insulating layer, the second insulating layer, the third insulating layer and the fourth insulating layer corresponding to the step are also covered with a stress layer.

3. The coaxial cable according to claim 1, characterized in that: The coaxial cable includes a head end and a tail end far away from the head end, and the first core, the second core, the third core and the fourth core are equidistantly arranged at their ends near the head end, and the first core, the second core, the third core and the fourth core are equidistantly arranged at their ends near the tail end.

4. The coaxial cable according to claim 1, characterized in that: The first core, the second core, the third core and the fourth core are respectively an A phase line, a B phase line, a C phase line and a ground line.

5. A cable reel collector box using a coaxial cable, characterized in that: It comprises a current collecting box, a plurality of power taking rings, an insulating sleeve and a coaxial cable as described in any one of claims 1 to 4; the power taking ring is arranged in the current collecting box, and the plurality of power taking rings are arranged in sequence at equal intervals along the axial direction of the current collecting box.

6. The cable reel collector box according to claim 5, characterized in that: The power collection ring is in the shape of a circular ring; a conductive connecting rod is provided in the support sleeve, and the conductive connecting rod includes a terminal for connecting to the reel cable, and the terminal extends out of the support sleeve, and the end of the conductive connecting rod away from the terminal is connected to the end of the first core, the second core, the third core or the fourth core.

7. The cable reel collector box according to claim 6, characterized in that: There are multiple support sleeves, and the multiple support sleeves are evenly spaced around the axis of the main body.

8. The cable reel collector box according to claim 5, characterized in that: The fourth wire core is a ground wire, and one end of the fourth wire core close to the insulating sleeve is used to connect to the ground wire of the reel cable or to be directly grounded, and one end of the fourth wire core away from the insulating sleeve is connected to the collector box.

9. The cable reel collector box according to claim 5, characterized in that: Ends of the first wire core, the second wire core and the third wire core away from the insulating sleeve are all sleeved with a conductive bracket, and the conductive bracket includes at least one conductive bar for connecting the power extraction ring.

10. The cable reel collector box according to claim 9, characterized in that: The conductive strip extends in the radial direction of the coaxial cable, a screw hole is provided at one end of the conductive strip close to the power taking ring, and the conductive strip is fastened to the power taking ring by locking screws.

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