A variable stiffness fatigue resistant flexible cable

Abstract

The application provides a flexible cable with variable rigidity and fatigue resistance, and relates to the technical field of cables.The flexible cable comprises a heat conduction channel arranged through in the axial direction of the cable, a conductor spirally arranged around the heat conduction channel, a filling layer covering the heat conduction channel and the conductor, a shielding layer with a storage cavity arranged on the inner side, and an adjusting layer comprising a plurality of rigid adjusting units, wherein the heat conduction channel is provided with heat conduction liquid, the filling layer is embedded with a heat conduction pipe, the heat conduction pipe is provided with a valve port, the heat conduction pipe is communicated with the storage cavity, and each rigid adjusting unit is a flexible bag filled with phase change material.The conductor is displaced and extruded to drive high-temperature liquid to flow into the storage cavity through the heat conduction pipe when the cable is bent, the liquid heat triggers the expansion of the phase change material through the shielding layer, the rigid adjusting unit is elongated to enhance the local rigidity, the effect of inhibiting excessive bending is achieved, the expansion of the phase change material is retained, the bending part is higher in short-time hardness than the surrounding area, and the purpose of dynamically transferring the bending stress point is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a flexible cable with variable rigidity and fatigue resistance. BACKGROUND

[0002] Flexible cables are electrical conductor assemblies with high flexibility and bending performance, used for power and signal transmission in dynamic environments, and are indispensable flexible links in modern industry and technology, widely used in devices that need to be frequently moved or used in complex environments, whether industrial robots, servo motors, or automation equipment, flexible cables can provide reliable power and signal transmission solutions.

[0003] However, during use, flexible cables may still be over-bent, and when the bending radius is below the safety threshold (such as low-voltage cables require ≥ 6 times the diameter), the conductor and the insulation layer will produce fatigue cracks due to tensile / compressive stress. Actual cases show that insulation layer rupture (accounting for 37%) and conductor fracture (accounting for 28%) are the main failure modes, especially at the outlet of the J-type pipe in offshore wind power, a single over-bend can cause the sheath to tear and the core to short circuit.

[0004] Furthermore, when a flexible cable is bent, repeated bending at the same location can cause fatigue failure, because during the first bend, the outer conductor of the cable undergoes plastic deformation (such as lattice slip of copper conductor) under tensile stress, and the inner conductor undergoes micro buckling under compressive stress, resulting in a decrease in the yield strength of the material in the area after the cable is straightened, forming a mechanically weak area, causing subsequent stress to continue to concentrate in this area, making it more likely to bend again, and ultimately leading to local permanent deformation, increased resistance, or short circuit.

[0005] In the prior art, the volume of the phase change material can be changed according to the working state of the cable, thereby changing the rigidity of the cable; however, the prior art can only change the rigidity of the entire cable, and cannot change the rigidity of the local cable, and cannot solve the problems of over-bending and repeated bending at the same location.

[0006] Therefore, in order to solve the above problems, the present application provides a flexible cable with variable rigidity and fatigue resistance, which aims to improve the ability to prevent over-bending and dynamic transfer of bending stress points of the flexible cable. SUMMARY

[0007] The present application aims to provide a flexible cable with variable rigidity and fatigue resistance, which aims to solve the problems of over-bending and repeated bending at the same location of the flexible cable.

[0008] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a flexible cable with variable rigidity and fatigue resistance, comprising, from inside to outside:

[0009] A heat-conducting channel is provided along the axial direction of the cable, and a heat-conducting liquid is arranged in the heat-conducting channel;

[0010] A plurality of groups of conductors are spirally arranged around the heat-conducting channel;

[0011] A filling layer is arranged to cover the heat-conducting channel and the conductors, and a heat-conducting pipe is arranged in the filling layer, and the heat-conducting pipe is provided with a valve port;

[0012] A shielding layer is arranged on the inner side of the cable, and the heat-conducting pipe is connected to the storage cavity;

[0013] An adjusting layer is arranged along the axial direction of the cable, and a plurality of rigid adjusting units are arranged in the adjusting layer, and each rigid adjusting unit is a flexible bag filled with a phase-change material;

[0014] When the cable is bent, the conductors are displaced and pressed against the heat-conducting channel, the high-temperature liquid is driven to flow into the storage cavity through the heat-conducting pipe, the heat of the liquid triggers the expansion of the phase-change material, and the rigid adjusting units are elongated to enhance the local rigidity.

[0015] Preferably, a plurality of rigid adjusting units are uniformly arranged along the circumferential direction of the cable, and the adjusting layer is the only rigid adjusting structure of the cable, and no external bending limiter or power supply device is needed.

[0016] Preferably, the spiral direction of the rigid adjusting unit is opposite to the spiral direction of the conductor.

[0017] Preferably, the adjusting layer is divided into a plurality of sections along the axial direction of the cable, each section of the adjusting layer includes a plurality of rigid adjusting units along the axial direction of the cable, and a partition plate is arranged between two sections of the adjusting layer.

[0018] Preferably, a temperature memory alloy wire is arranged in the flexible bag of the rigid adjusting unit, and the phase-change temperature of the temperature memory alloy wire is higher than that of the phase-change material in the rigid adjusting unit, so as to limit the excessive expansion of the flexible bag.

[0019] Preferably, the valve port can be bidirectionally opened according to the pressure difference, so that the liquid in the heat-conducting channel and the storage cavity can pass through the valve port when the pressure changes.

[0020] Preferably, the valve port is a conical micropore structure, and each valve port includes two conical micropore structures with opposite directions.

[0021] Preferably, a plurality of heat-conducting pipes are arranged in the filling layer along the circumferential direction of the heat-conducting channel, and the heat-conducting pipes are arranged along the axial direction of the cable.

[0022] Preferably, an insulating layer is arranged between the conductors and the filling layer, and a protective layer is arranged on the outer side of the adjusting layer.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] The application sets the heat conduction channel and the rigid adjusting unit, the conductor extrudes the heat conduction channel when the cable bends, the high-temperature liquid flows into the storage cavity, the phase change material in the rigid adjusting unit expands, the rigidity of the bending part is improved, the purpose of self-reinforcement of the bending part is achieved, the effect of inhibiting excessive bending is achieved; and the temperature of the phase change material lingers after absorbing heat, the hardness of the bending part is higher than that of the surrounding area for a short time, the stress is automatically transferred to the adjacent flexible section when the cable is bent again, the purpose of dynamically transferring the bending stress point is achieved, the same position is repeatedly bent and fatigued, the problem that the cable is damaged due to bending at the same position is solved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a schematic view of the cross section of the flexible cable of the application.

[0026] Fig. 2 is a schematic view of the structure of the adjusting layer in the application.

[0027] Fig. 3 is a schematic view of the structure of the conductor in the application.

[0028] REFERENCE NUMERALS:

[0029] 1, conductor; 2, insulation layer; 3, filling layer; 31, heat conduction pipe; 32, valve port; 4, heat conduction channel; 5, shielding layer; 51, storage cavity; 6, adjusting layer; 61, rigid adjusting unit; 7, protective layer. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0031] To improve the anti-overbending and anti-fatigue ability of the flexible cable, as shown in the drawings, Figs. 1 to 3 the application proposes a variable-rigidity anti-fatigue flexible cable, increases the "mechanical triggering + thermal response" synergistic mechanism, and can realize bending self-adjusting rigidity. The flexible cable comprises, from inside to outside: a heat conduction channel 4, a conductor 1, a filling layer 3, a shielding layer 5, an adjusting layer 6, and a protective layer 7.

[0032] The heat-conducting channel 4 is provided through the cable in the axial direction, and a heat-conducting liquid is arranged in the heat-conducting channel 4; the heat-conducting channel 4 is located at the center of the cable, and the heat-conducting liquid can be a silicon oil-based liquid for heat conduction, which has a stable heat conduction coefficient (0.54-0.56 W / m·K) in the range of 70-120 ℃, can efficiently conduct heat to the phase change material, and shortens the response time of the rigid adjusting unit 61; the silicon oil-based liquid has low viscosity (about 5 mPa·s at 25 ℃), can better cooperate with the conical micro-hole structure of the valve port 32, and has high oxidation resistance and does not need to be replaced.

[0033] The conductor 1 is spirally provided with a plurality of groups around the heat-conducting channel 4, and an insulating layer 2 is arranged outside the conductor 1; when the cable is bent, the outer side of the conductor 1 is stretched, and the inner side of the conductor 1 is compressed. The spiral structure enables the outer conductor 1 to move to the inside of the bending when the cable is bent, and the inner conductor 1 to move to the outside, thereby forming a dynamic balance.

[0034] The filling layer 3 covers the heat-conducting channel 4 and the conductor 1, and a heat-conducting pipe 31 is embedded in the filling layer 3; the heat-conducting pipe 31 is provided with a valve port 32, one end of the heat-conducting pipe 31 is communicated with the heat-conducting channel 4, and the other end of the heat-conducting pipe 31 extends to the outside of the filling layer 3, and the valve port 32 is located at the end close to the filling layer 3.

[0035] The heat-conducting pipe 31 in the filling layer 3 is circumferentially provided with a plurality of heat-conducting pipes 31, and the heat-conducting pipe 31 is axially provided with a plurality of heat-conducting pipes 31, so that the rigid adjusting unit 61 can respond in time when the cable is bent each time; the heat-conducting pipe 31 can be a corrugated copper pipe.

[0036] The filling layer 3 is made of silicone rubber composite acrylonitrile rubber, so that the filling layer 3 can meet the requirements of elastic support, heat conduction adaptation and fatigue resistance; the silicone rubber composite acrylonitrile rubber has a Shore hardness of 60A-70A, is moderately rigid and flexible, and can meet the buffering requirements when the cable is bent; the heat conduction coefficient is 0.25-0.35 W / (m·K), which is higher than that of ordinary rubber, and is beneficial to the heat transfer from the heat-conducting pipe 31 to the phase change material; the silicone rubber composite acrylonitrile rubber has a high high-low temperature resistance of-50-180 ℃, and can adapt to various extreme working conditions.

[0037] The shielding layer 5 is provided with a storage cavity 51 on the inside, the storage cavity 51 is annular, and a plurality of storage cavities 51 are arranged along the axial direction of the cable; the storage cavity 51 corresponds to the heat-conducting pipe 31 in the axial direction of the cable, and the heat-conducting pipe 31 is communicated with the storage cavity 51; the shielding layer 5 has a multi-layer structure, which can be a structure in which aluminum foil and tinned copper wire braided mesh are bonded by conductive adhesive, and can meet the requirements of heat conduction, flexibility and electromagnetic shielding function.

[0038] The inner layer of the shielding layer 5 uses an ultra-thin aluminum foil, and is designed to fit the storage cavity 51; the heat conduction coefficient is greater than or equal to 200 W / (m·K), efficient heat conduction to the phase change material is achieved, the outer layer uses a tinned copper wire braided mesh, and the dynamic flexibility of the cable is maintained; the middle layer uses a hot melt conductive adhesive, so that the aluminum foil and the copper mesh are not peeled off, and the axial elasticity is maintained; the hot melt conductive adhesive can be silicone-based.

[0039] The adjusting layer 6 comprises a plurality of rigid adjusting units 61 arranged spirally along the cable axial direction, each rigid adjusting unit 61 is a flexible bag filled with phase change material; a temperature memory alloy wire is embedded in the flexible bag of the rigid adjusting unit 61, the phase change temperature of the temperature memory alloy wire is 10-15℃ higher than that of the phase change material in the rigid adjusting unit 61, which can limit the over-expansion of the flexible bag; the spiral arrangement of the rigid adjusting unit 61 can make the phase change material expand and elongate along the length direction of the rigid adjusting unit 61, so as to make the cable have the tendency of elongating along the axial direction and enhance the local rigidity.

[0040] The flexible bag adopts fluororubber with a wall thickness of 0.5-1mm, the fluororubber has oil resistance and high temperature stability, the phase change material is a paraffin-based composite material, the phase change temperature is 50℃±5℃, the volume expansion rate is ≥25%, and the cost is low and the latent heat is high; the paraffin-based composite material can also add 1%-3% nano-aluminum oxide to improve the thermal conductivity, and can add octadecanol to inhibit supercooling.

[0041] The temperature memory alloy wire adopts a nitinol material, the phase change temperature is 60-65℃, when the phase change material is abnormally overheated, the alloy wire shrinks and tightens the flexible bag wall to limit the over-expansion, thereby completing the protection of the cable when the phase change material fails.

[0042] The rigid adjusting units 61 are uniformly arranged in multiple along the cable circumferential direction, the adjusting layer 6 is the only rigid adjusting structure of the cable, without external limiting bending device or additional power supply device, and the stiffness is self-adaptively adjusted through heat energy and mechanical energy conversion; and after the volume of the phase change material increases, the rigid adjusting units 61 form a local high-rigidity area, and the bending radius is dynamically controlled within a safety threshold.

[0043] The adjusting layer 6 is divided into multiple sections along the cable axial direction, each section of the adjusting layer 6 comprises a plurality of rigid adjusting units 61 along the cable axial direction, and a partition plate is arranged between every two sections of the adjusting layer 6; the partition plate can use glass fiber reinforced polypropylene to avoid the influence of thermal deformation on the sealing property.

[0044] The spiral direction of the rigid adjusting unit 61 is opposite to the spiral direction of the conductor 1, so that the temperature distribution is more uniform, the rigidity of the corresponding area of the cable is improved when the cable is bent, and the stress of the cable is dispersed. Fig. 2 Fig. 3 It can be seen that the spiral direction of the adjusting unit 61 is opposite to that of the conductor 1; the opposite spiral directions of the conductor 1 and the rigid adjusting unit 61 can make the temperature distribution more uniform, ensure that the rigidity of the corresponding area of the cable is improved when the cable is bent, and disperse the stress of the cable.

[0045] The heat pipe 31 is close to the conductor 1, and the liquid in the heat pipe 31 is also in a high-temperature state, so that the phase change material in the rigid adjusting unit 61 can respond in time after the liquid enters the storage cavity 51.

[0046] ​Valve port 32 can be bidirectional according to the pressure difference, so that the heat conduction channel 4 and the liquid in the storage cavity 51 pass through the valve port 32 when the pressure changes. The valve port 32 is a conical micropore structure with a pore size ranging from 0.2 to 0.5 mm, which is open when the pressure difference between the two ends is greater than 0.1 MPa. The valve port 32 can be connected according to the pressure difference on both sides. When the pressure on one side is greater than the other side, the liquid on the high pressure side flows to the low pressure side. When there is no pressure difference between the two ends, it is cut off to prevent backflow.

[0047] The valve port 32 is a conical channel with a gradually shrinking aperture from the inlet to the outlet. Two conical channels with opposite directions are provided at one valve port 32, which can respond to different pressure differences and realize the bidirectional passage of heat-conducting liquid. When the cable is bent, the heat-conducting liquid enters the storage cavity 51 through one of the conical channels of the valve port 32. When the cable returns to the straight state, the heat-conducting liquid enters the heat-conducting channel 4 through the other conical channel of the valve port 32. The phase change material is heated, and the circulation of the heat-conducting liquid is completed.

[0048] The conical micropore structure of the valve port 32 can be completed at the same time when the filling layer 3 is manufactured. The conical micropore structure of the valve port 32 can also be processed by laser drilling process. KrF excimer laser can be used in combination with double mask exchange table to complete the processing of the conical micropore structure.

[0049] The protective layer 7 covers the outside of the adjustment layer 6. After the phase change material expands, it gives a certain pressure to the rigid adjustment unit 61, so that the rigid adjustment unit 61 can stably elongate in the axial direction, thereby improving the local rigidity of the cable.

[0050] When the cable is bent, the conductor 1 is displaced and pressed against the heat-conducting channel 4, driving the high-temperature liquid to flow into the storage cavity 51 through the heat-conducting pipe 31. The heat of the liquid triggers the expansion of the phase change material, causing the rigid adjustment unit 61 to elongate to enhance the local rigidity. The heat energy generated by the first bending of the cable is transmitted to the phase change material through the liquid, triggering the local rigidity enhancement. The bending stress barrier is formed in the rigid adjustment unit 61, forcing the secondary bending position to shift.

[0051] The phase change material in the rigid adjustment unit 61 can increase in volume when the temperature rises. The rigid adjustment unit 61 elongates in the spiral direction when it increases, so that the cable has a tendency to stretch, thereby increasing the rigidity of this part of the cable.

[0052] When the cable is bent, the conductor 1 squeezes the heat conduction channel 4, and the heat of the high-temperature liquid is transferred to the phase change material of the rigid adjusting unit 61, so that the volume of the phase change material increases, thereby increasing the local rigidity; when the cable changes from bending to straightening, the high-temperature liquid returns to the heat conduction channel 4, and the phase change material will not continue to be affected by the high-temperature liquid, but the phase change material needs time to recover the volume due to temperature retention, which can be controlled within 5 minutes; when the phase change material is still in the expansion state, the rigidity of the original bending position of the cable is higher than that of the surrounding area, and when the cable is bent again within this time, it will automatically avoid the original bending position with high rigidity; after a period of time, the phase change material restores the original volume, and the cable in the area also restores the original flexibility, fully playing the role of flexible cable.

[0053] In the present embodiment, by the arrangement of the heat conduction channel 4 and the rigid adjusting unit 61, when the cable is bent, the conductor 1 squeezes the heat conduction channel 4, and the high-temperature liquid is driven to flow into the storage cavity 51, triggering the expansion of the phase change material, so that the rigidity of the bending position is instantaneously increased, and the bending radius is dynamically controlled within the safety threshold; at the same time, the temperature of the phase change material is retained after absorbing heat, so that the hardness of the bending position is higher than that of the surrounding area for a short time. When bent again, the stress is automatically transferred to the adjacent flexible section, reducing local stress concentration, avoiding repeated fatigue at the same position, and increasing the service life of the cable.

[0054] The cable includes a bending triggering stage, a thermal response stage, and a rigidity maintaining stage when bent.

[0055] Bending triggering stage: when the cable is bent, the spiral conductor 1 is displaced towards the center to squeeze the heat conduction channel 4, driving the high-temperature liquid in the heat conduction channel 4 to flow into the storage cavity 51 through the valve port 32.

[0056] When the flexible cable is bent, the conductor 1 at the bending position is displaced towards the center due to its spiral structure, causing the outer wires at the bending position to move towards the inside, and the inner wires to compensate for the displacement, thereby squeezing the heat conduction channel 4, so that the liquid in the heat conduction channel 4 enters the storage cavity 51 along the heat conduction pipe 31, and the liquid in the heat conduction channel 4 is close to the conductor 1, so that the temperature of these liquids is higher than that of the outside.

[0057] Thermal response stage: the heat of the high-temperature liquid is conducted to the phase change material through the shielding layer 5, triggering the volume expansion, so that the rigid adjusting unit 61 is axially elongated, and the adjusting layer 6 forms a local rigidity area.

[0058] When these high-temperature liquids enter the storage cavity 51, the shielding layer 5 conducts heat to the rigid adjusting unit 61 of the adjusting layer 6, the phase change material in the flexible bag of the rigid adjusting unit 61 is heated, and the volume increases, thereby increasing the rigidity of this part; so that the cable will not be excessively bent at the bending position.

[0059] Rigidity maintaining stage: the phase change material stays constant temperature after absorbing heat, the bending stress is transferred to the adjacent area, and the secondary bending of the cable in the same position is inhibited.

[0060] When the flexible cable exits from the bending state, because the temperature of the phase change material stays constant after absorbing heat, the phase change material is still in the expansion state, and the conductor 1 and the heat conduction channel 4 have returned to the original state. At this time, the pressure in the storage cavity 51 is greater than the heat conduction channel 4, so that the heat conduction liquid in the storage cavity 51 returns to the heat conduction channel 4. However, the hardness of the region is temporarily higher than that of the surrounding region, and when the secondary bending occurs, the stress is automatically transferred to the adjacent flexible section, thereby avoiding repeated fatigue in the same position, and the cable will not be repeatedly bent in the same position.

[0061] When the original bending position of the flexible cable is not continuously bent, the phase change material at the position will gradually restore the original volume after a period of time, thereby gradually reducing the rigidity of the cable at the region, and finally restoring the flexibility of the part of the cable.

[0062] It should be noted that the process of inhibiting excessive bending damage in the embodiment is as follows:

[0063] When the cable is bent, the conductor 1 extrudes the heat conduction channel 4, drives the high-temperature liquid to flow into the storage cavity 51, triggers the expansion of the phase change material, and instantaneously increases the rigidity of the bending part. Compared with the traditional flexible cable which only relies on the tensile resistance of the material, such as the tensile rope structure which only delays damage by 5% to 15%, the present scheme forms a local high-rigidity region by the expansion of the phase change material in the rigidity adjusting unit 61, dynamically controls the bending radius within a safety threshold, and avoids the rupture of the insulating layer 2 or the fracture of the conductor 1.

[0064] The process of eliminating the "weak area effect" in the embodiment is as follows:

[0065] When the cable recovers from the bending state to the straight state, the phase change material stays constant temperature after absorbing heat, so that the original bending part has a higher hardness than the surrounding region for a short time. When the secondary bending occurs, the stress is automatically transferred to the adjacent flexible section, thereby avoiding repeated fatigue in the same position, and reducing the local stress concentration. When the original bending position of the cable is no longer bent, the volume of the phase change material gradually decreases, and gradually restores the original volume, thereby gradually reducing the local rigidity, and finally restoring the original performance of the cable, thereby ensuring the flexibility of the cable during use.

[0066] The present application utilizes the bending action required by the cable and the temperature of the conductor 1 inside the cable to transfer the temperature near the conductor 1 to the phase change material of the adjusting layer 6 when the cable is bent, increase the rigidity of the local conductor 1 through the volume change of the phase change material, complete the self-adjustment of the rigidity of the cable, and the rigidity of the region is temporarily increased, thereby changing the bending position of the cable afterwards, and solving the problem of cable damage caused by bending in the same position.

[0067] The above merely describes preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes within the technical scope disclosed by the present application and according to the technical solutions and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A variable stiffness, fatigue resistant, flexible electrical cable, characterized by, It comprises, from inside to outside: a heat-conducting channel, which is provided through along the axial direction of the cable, and in which a heat-conducting liquid is arranged; a conductor, which is provided spirally around the heat-conducting channel in multiple groups; a filling layer, which covers the heat-conducting channel and the conductor, and in which a heat-conducting pipe with a valve port is embedded; a shielding layer, the inner side of which is provided with a storage cavity, and the heat-conducting pipe is connected to the storage cavity; an adjusting layer, which comprises multiple rigid adjusting units arranged spirally along the axial direction of the cable, and each rigid adjusting unit is a flexible bag filled with a phase-change material; wherein, when the cable is bent, the conductor is displaced towards the center and presses the heat-conducting channel, driving the high-temperature liquid to flow into the storage cavity through the valve port, and the heat of the liquid triggers the expansion of the phase-change material, so that the rigid adjusting unit is axially elongated to form a local rigid area, which inhibits excessive bending and shifts the stress point.

2. The flexible cable of claim 1, wherein, The rigid adjusting units are arranged uniformly in multiple along the circumferential direction of the cable, and the adjusting layer is the only rigid adjusting structure of the cable.

3. The flexible cable of claim 2, wherein, The spiral direction of the rigid adjusting unit is opposite to the spiral direction of the conductor.

4. The flexible cable of claim 3, wherein, The adjusting layer is divided into multiple sections along the axial direction of the cable, each section of the adjusting layer comprises multiple rigid adjusting units along the axial direction of the cable, and each two sections of the adjusting layer are separated by a partition plate.

5. The flexible cable of claim 1, wherein, A temperature memory alloy wire is embedded in the flexible bag of the rigid adjusting unit to limit the excessive expansion of the flexible bag.

6. The flexible cable of claim 1, wherein, The valve port can be bidirectional according to the pressure difference, so that the liquid in the heat-conducting channel and the storage cavity can pass through the valve port when the pressure changes.

7. The flexible cable of claim 6, wherein, The valve port is a conical micropore structure, and each valve port comprises two conical micropore structures in opposite directions.

8. The flexible cable of claim 1, wherein, The heat-conducting pipe in the filling layer is arranged in multiple along the circumferential direction of the heat-conducting channel, and multiple heat-conducting pipes are arranged along the axial direction of the cable.

9. The flexible cable of claim 1, wherein, An insulating layer is arranged between the conductor and the filling layer, and a protective layer is arranged on the outer side of the adjusting layer.

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