Marine erosion-resistant control cable

Abstract

The invention relates to the technical field of cables, in particular to a marine erosion-resistant control cable which comprises a cable core and an inner heat conduction sleeve which are sequentially sleeved from inside to outside, the inner heat conduction sleeve is provided with a plurality of first mounting holes used for mounting the cable core and a plurality of second cavities different in size, the first mounting holes form arc-shaped protrusions in a containing cavity, and the second mounting holes form arc-shaped protrusions in the containing cavity. The protrusions are connected with the first cavities, the second cavities are sequentially distributed in the circumferential direction of the protrusions, the sizes of the second cavities are in negative correlation with the distance from the portions, located in the second cavities, of the protrusions to the axis of the inner heat conduction sleeve, the second cavities are filled with inert gas, and the pressure intensity in the second cavities is in positive correlation with the sizes of the second cavities. The second cavity is arranged, so that the heat on the peripheral surface of the cable core is more uniformly dissipated through the peripheral surface of the inner heat conduction sleeve, and the heat dissipation uniformity of the peripheral surface of the first mounting hole is improved; the pressure intensity in the second cavities is different, so that the heat dissipation speed in each second cavity is basically consistent, and the heat dissipation uniformity of the cable core is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a marine erosion-resistant control cable. Background Art

[0002] Today, with the continuous development of the shipbuilding industry, marine control cables, as a crucial part of the ship's electrical system, directly affect the safe operation and service life of the ship.

[0003] At present, there are some problems that need to be solved urgently in the practical application of existing erosion-resistant marine control cables. Due to the complex and changeable operating environment of ships, especially in the marine environment, cables are facing various adverse factors such as seawater erosion, humidity, and high temperature. However, there are certain limitations in the design and manufacture of existing erosion-resistant marine control cables.

[0004] Among them, a more prominent problem is that due to the different numbers of inner cores in the cable, the distances from the circumferential positions of the inner cores to the outside are different. During the operation of the cable, current passing through the cores generates heat, and this difference in distance leads to uneven heat transfer inside. The part of the core closer to the outside is relatively easier to dissipate heat, while the part farther away has difficulty dissipating heat, thus affecting the overall heat dissipation effect. Uneven heat distribution will cause local thermal stress inside the cable. In the long term, it will damage the insulation layer and other structures of the cable, reducing the service life of the cable; at the same time, the cable is prone to performance instability due to uneven heat distribution, posing a safety hazard. Summary of the Invention

[0005] Based on this, in view of the problem of weak heat dissipation capacity of current multi-core cables, it is necessary to provide a marine erosion-resistant control cable.

[0006] The above object is achieved by the following technical solutions: A marine erosion-resistant control cable includes a cable core, an inner sheath, and an outer sheath sleeved from the inside to the outside in sequence. The inner sheath includes an inner heat-conducting sleeve which is cylindrical. The axis of the cable core is parallel to the axis of the inner heat-conducting sleeve. The inner heat-conducting sleeve is provided with a cavity and a plurality of first mounting holes for mounting the cable core. The plurality of first mounting holes are evenly distributed around the axis of the inner heat-conducting sleeve. The number of cavities is the same as the number of first mounting holes. Each cavity is located between two radial lines of the inner heat-conducting sleeve that respectively pass through the centers of adjacent first mounting holes. Each cavity is an independent space. The first mounting holes form an arc-shaped protrusion in the cavity. A first partition is arranged in the cavity. The first partition divides the cavity into two first cavities that are symmetrical in the circumferential direction of the inner heat-conducting sleeve. A plurality of second partitions are arranged in each first cavity. One side of each second partition is connected to the inner wall of the inner heat-conducting sleeve, and the other side of each second partition is connected to the protrusion in the corresponding cavity. The plurality of second partitions divide the corresponding first cavity into a plurality of second cavities distributed around the protrusion in the circumferential direction. The size of the second cavity is negatively correlated with the distance from the part of the protrusion located in the second cavity to the axis of the inner heat-conducting sleeve. The second cavity is filled with an inert gas, and the pressure in the second cavity is positively correlated with the size of the second cavity. The outer sheath is used to protect the inner sheath.

[0007] Preferably, the sides of the plurality of second partitions connected to the protrusion are sequentially distributed along the circumferential direction of the protrusion, and the plurality of second partitions connected to the protrusion equally divide the protrusion; the sides of the plurality of second partitions connected to the inner wall of the inner heat-conducting sleeve are sequentially distributed around the circumferential direction of the inner heat-conducting sleeve, and the plurality of second partitions connected to the inner wall of the inner heat-conducting sleeve equally divide the inner wall of the inner heat-conducting sleeve in the corresponding first cavity.

[0008] Preferably, a second mounting hole is opened at the center of the inner heat-conducting sleeve. The second mounting hole is not communicated with the first mounting hole and the cavity. The second mounting hole is used to mount a strengthening core.

[0009] Preferably, a plurality of through grooves equal in number to the first mounting holes are opened on the circumferential surface of the inner heat-conducting sleeve. Each through groove is correspondingly arranged with a first mounting hole, and the through groove penetrates the circumferential surface of the inner heat-conducting sleeve along the radial direction of the inner heat-conducting sleeve and is communicated with the corresponding first mounting hole. One of the through grooves penetrates the first mounting hole and is communicated with the second mounting hole.

[0010] Preferably, the inner heat-conducting sleeve includes a plurality of sector columns. The number of sector columns is the same as the number of cable cores. The plurality of sector columns can form a complete cylinder. Semi-circular grooves are opened on the mutually approaching surfaces of two adjacent sector columns in the cylinder. The two semi-circular grooves form a first mounting hole. Each cavity is opened on one sector column. An arc groove is opened at the center of each sector column. The arc groove and the corresponding sector column are coaxial. The arc grooves on the plurality of sector columns after forming the cylinder form the second mounting hole.

[0011] Preferably, the inner protective layer further includes an outer heat-conducting sleeve sleeved on the circumferential surface of the inner heat-conducting sleeve. A plurality of third cavities are provided inside the inner heat-conducting sleeve. A third partition is provided between two adjacent third cavities. The third partition extends along the axial direction of the outer heat-conducting sleeve and is spirally arranged around the axis of the outer heat-conducting sleeve. An inert gas is filled in each third cavity. The connection line between the two ends of each third partition is parallel to the axis of the outer heat-conducting sleeve.

[0012] Preferably, there are a plurality of inner heat-conducting sleeves and outer heat-conducting sleeves. The plurality of inner heat-conducting sleeves and outer heat-conducting sleeves are all arranged along the axial direction of the cable core. The second cavities in the inner heat-conducting sleeves and the third cavities in the outer heat-conducting sleeves are all independent sealed cavities.

[0013] Preferably, the erosion-resistant marine control cable further includes a plurality of end caps. The number of end caps is the same as the number of cavities on the inner heat-conducting sleeve. The shape of each end cap is the same as the cross-sectional shape of the cavity perpendicular to the axis of the cable core. The radius of the end cap is the same as the radius of the outer heat-conducting sleeve.

[0014] Preferably, the inner protective layer further includes an anti-corrosion layer and a shielding armor layer. The anti-corrosion layer is sleeved on the outer heat-conducting sleeve to reduce the corrosion of the outer heat-conducting sleeve. The shielding armor layer is sleeved on the anti-corrosion layer and is attached to the outer sheath. The shielding armor layer is made of anti-corrosion type tinned copper wire braiding.

[0015] Preferably, adhesives are provided between the outer heat-conducting sleeve, the anti-corrosion layer, the shielding armor layer and the outer sheath sleeved on the inner heat-conducting sleeve in sequence.

[0016] The beneficial effects of the present invention are as follows: By providing the first cavity around the first installation hole, the heat on the circumferential surface of the cable core is more evenly dissipated into the first cavity, and the heat in the first cavity is then dissipated through the circumferential surface of the inner heat-conducting sleeve, improving the heat dissipation uniformity of the circumferential surface of the first installation hole, and avoiding local overheating of the cable core at a position far from the outer circumferential surface of the inner heat-conducting sleeve in the first installation hole, thereby affecting the overall heat dissipation effect; By providing the second cavity and increasing the gas pressure in the larger second cavity to reduce the molecular spacing between gases, the heat dissipation speed in each second cavity is basically the same, further improving the heat dissipation uniformity of the cable core. Brief Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of a marine erosion-resistant control cable provided by an embodiment of the present invention; Figure 2 is a top view of a marine erosion-resistant control cable provided by an embodiment of the present invention; Figure 3 is Figure 2 a cross-sectional view taken along the line A-A in Figure 4 is a schematic structural diagram of an inner heat-conducting sleeve of a marine erosion-resistant control cable provided by an embodiment of the present invention; Figure 5 Schematic structural diagram of an external heat-conducting sleeve of a marine erosion-resistant control cable provided by an embodiment of the present invention; Figure 6 Internal structural diagram of an external heat-conducting sleeve of a marine erosion-resistant control cable provided by an embodiment of the present invention; Figure 7 Schematic structural diagram of an end cap of a marine erosion-resistant control cable provided by an embodiment of the present invention.

[0018] Wherein: 100, cable core; 101, internal heat-conducting sleeve; 102, first mounting hole; 103, first partition; 104, second partition; 105, second cavity; 106, second mounting hole; 107, through groove; 200, external heat-conducting sleeve; 201, third cavity; 202, third partition; 300, end cap; 400, anti-corrosion layer; 500, shielding armor layer; 600, outer sheath; 700, strengthening core. Specific embodiments

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise clearly defined and limited, both include direct and indirect connection (coupling). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0021] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0022] As Figures 1 to 7 shown, an embodiment of the present invention provides a marine erosion-resistant control cable, which includes a cable core 100, an inner sheath, and an outer sheath 600 sleeved from inside to outside in sequence. The inner sheath includes an inner heat-conducting sleeve 101. The inner heat-conducting sleeve 101 is cylindrical, and the axis of the cable core 100 is parallel to the axis of the inner heat-conducting sleeve 101. A cavity and a plurality of first mounting holes 102 for mounting the cable core 100 are formed on the inner heat-conducting sleeve 101. The plurality of first mounting holes 102 are evenly distributed around the axis of the inner heat-conducting sleeve 101. The number of cavities is the same as the number of first mounting holes 102. Each cavity is located between two radial lines of the inner heat-conducting sleeve 101 that respectively pass through the centers of adjacent first mounting holes 102. Each cavity is an independent space. The first mounting holes 102 form an arc-shaped protrusion in the cavity. A first partition 103 is arranged in the cavity. The first partition 103 divides the cavity into two first cavities that are symmetric in the circumferential direction of the inner heat-conducting sleeve 101. A plurality of second partitions 104 are arranged in each first cavity. One side of each second partition 104 is connected to the inner wall of the inner heat-conducting sleeve 101, and the other side of each second partition 104 is connected to the protrusion in the corresponding cavity. The plurality of second partitions 104 divide the corresponding first cavity into a plurality of second cavities 105 distributed around the protrusion in the circumferential direction. The size of the second cavity 105 is negatively correlated with the distance from the part of the protrusion located in the second cavity 105 to the axis of the inner heat-conducting sleeve 101. Inert gas is filled in the second cavity 105, and the pressure in the second cavity 105 is positively correlated with the size of the second cavity 105; the outer sheath 600 is used to protect the inner sheath.

[0023] By arranging the first cavity around the first mounting hole 102, the heat on the circumferential surface of the cable core 100 can be more evenly dissipated into the first cavity, and the heat in the first cavity is then dissipated through the circumferential surface of the inner heat-conducting sleeve 101, improving the heat dissipation uniformity of the circumferential surface of the first mounting hole 102 and avoiding local overheating of the cable core 100 at the first mounting hole 102 due to the relatively large distance from the outer circumferential surface of the inner heat-conducting sleeve 101, thereby affecting the overall heat dissipation effect; arranging the second cavity 105 and increasing the gas pressure in the larger second cavity 105 to reduce the molecular spacing between gases, so that the heat dissipation speed in each second cavity 105 is basically the same, further improving the heat dissipation uniformity of the cable core 100.

[0024] In this embodiment, on one side where multiple second partition plates 104 are connected to the protrusion, they are sequentially distributed along the circumferential direction of the protrusion, and the multiple second partition plates 104 connected to the protrusion equally divide the protrusion; on one side where the multiple second partition plates 104 are connected to the inner wall of the inner heat conducting sleeve 101, they are sequentially distributed around the circumferential direction of the inner heat conducting sleeve 101, and the multiple second partition plates 104 connected to the inner wall of the inner heat conducting sleeve 101 equally divide the inner wall of the inner heat conducting sleeve 101 in the corresponding first cavity, which can improve the uniformity of the inner heat conducting sleeve 101 after heating; the number of the second partition plates in each first cavity determines the size of the second cavity 105, and at the same time determines the number of segments into which the first installation hole 102 and the inner heat conducting sleeve 101 are divided. The more segments the first installation hole 102 and the inner heat conducting sleeve 101 are divided into, the better the heat dissipation uniformity of the corresponding cable core 100.

[0025] The position of the first installation hole 102 corresponding to a larger second cavity 105 is closer to the center of the inner heat conducting sleeve 101, and the gas pressure in the second cavity 105 is greater. The greater the pressure that this position can withstand in the radial direction of the inner heat conducting sleeve 101, the smaller the gap with the pressure that can be borne at the position where the cable core 100 passes through in the radial direction of the inner heat conducting sleeve 101, making the pressure-bearing capacity at each position of the inner heat conducting sleeve 101 basically the same.

[0026] In this embodiment, a second installation hole 106 is provided at the center of the inner heat conducting sleeve 101. The second installation hole 106 is not communicated with the first installation hole 102 and the cavity. The second installation hole 106 is used to install the strengthening core 700. The strengthening core 700 is made of aramid rope, which not only ensures its flexibility but also improves the overall tensile strength of the cable.

[0027] In this embodiment, the same number of through grooves 107 as the first installation holes 102 are provided on the circumferential surface of the inner heat conducting sleeve 101. Each through groove 107 is correspondingly arranged with one first installation hole 102, and the through groove 107 penetrates the circumferential surface of the inner heat conducting sleeve 101 in the radial direction of the inner heat conducting sleeve 101 and is communicated with the corresponding first installation hole 102. One of the through grooves 107 penetrates the first installation hole 102 and is communicated with the second installation hole 106. The inner heat conducting sleeve 101 is made of rubber material. Before installing the cable core 100, the strengthening core 700 is first installed into the second installation hole 106 through the through groove 107 communicated with the second installation hole 106, and then each cable core 100 is installed into the corresponding first installation hole 102 through each through groove 107, which is convenient and fast. After all the cable cores 100 and the strengthening core 700 are installed, under the elastic force of the inner heat conducting sleeve 101 itself, the through groove 107 can be closed. The number of the inner heat conducting sleeves 101 is multiple. Adjacent two inner heat conducting sleeves 101 can be connected by an adhesive. Inert gas is filled inside each inner heat conducting sleeve 101. When the cable is cut according to actual installation requirements, the gas inside the uncut inner heat conducting sleeve 101 and the outer heat conducting sleeve 200 is not affected.

[0028] In this embodiment, the inner heat-conducting sleeve 101 includes a plurality of fan-shaped columns, the number of the fan-shaped columns is consistent with the number of the cable cores 100, and the plurality of fan-shaped columns can form a complete cylinder. Semicircular grooves are provided on the surfaces of two adjacent fan-shaped columns in the cylinder that are close to each other, and the two semicircular grooves form a first mounting hole 102. Each cavity is provided on a fan-shaped column, and an arc groove is provided at the center of each fan-shaped column. The arc groove is coaxial with the corresponding fan-shaped column, and the arc grooves on the plurality of fan-shaped columns that form the cylinder form a second mounting hole 106. The inner heat-conducting sleeve 101 adopts a split design, which is convenient for processing and coating on the cable core 100.

[0029] In this embodiment, the inner protective layer also includes an outer heat-conducting sleeve 200, which is sleeved on the circumference of the inner heat-conducting sleeve 101. A plurality of third cavities 201 are provided inside the inner heat-conducting sleeve 101. A third partition plate 202 is provided between two adjacent third cavities 201. The third partition plate 202 extends along the axial direction of the outer heat-conducting sleeve 200, and the third partition plate 202 is spirally arranged around the axis of the outer heat-conducting sleeve 200. Each third cavity 201 is filled with an inert gas, and both ends of each third partition plate 202 are The connecting line between them is parallel to the axis of the outer heat-conducting sleeve 200. The third cavity 201 spirally arranged on the outer circumference of the inner heat-conducting sleeve 101 can be located above each cable core 100. When a certain cable core 100 generates a large amount of heat, the heat of the cable core 100 can be covered on the surface of the entire cable through the third cavity 201, so that the overall temperature of the cable is as consistent as possible, avoiding local overheating of the cable; at the same time, the use of multiple third cavities 201 can reduce the uncontrollability of heat transfer in the third cavity 201. A spiral installation groove is provided on the circumference of the outer heat-conducting sleeve 200. The spiral direction and pitch of the installation groove are consistent with the spiral direction and pitch of the third partition plate 202. When installing the outer heat-conducting sleeve 200, the outer heat-conducting sleeve 200 is opened to make the installation groove larger so that the inner heat-conducting sleeve 101 can pass through. The first partition plate 103 and the second partition plate 104 are arranged in the inner heat-conducting sleeve 101 , and the third partition plate 202 is arranged in the outer heat-conducting sleeve 200 , which can improve the compression and torsion resistance of the inner heat-conducting sleeve 101 and the outer heat-conducting sleeve 200 .

[0030] The outer thermal conductive sleeve 200 is based on halogen-free low-smoke flame-retardant polyolefin, with the addition of flame retardants, antioxidants, cross-linking agents, ultraviolet light absorbers or light shielding agents and other additives, and then uses high-energy electron accelerator irradiation technology to transform its branch structure into a network cross-linked structure, meeting the requirements of oil resistance, UV resistance, corrosion resistance, wear resistance, ozone resistance, high temperature resistance, seawater resistance and other properties.

[0031] In this embodiment, a plurality of inner heat-conducting sleeves 101 and outer heat-conducting sleeves 200 are provided. The plurality of inner heat-conducting sleeves 101 and outer heat-conducting sleeves 200 are all arranged along the axial direction of the cable core 100. The second cavity 105 in the inner heat-conducting sleeve 101 and the third cavity 201 in the outer heat-conducting sleeve 200 are both independent sealed cavities. After the cable is adaptively truncated, there are still a plurality of inner heat-conducting sleeves 101 and outer heat-conducting sleeves 200 that can be used normally inside the cable, and the overall cable still has a good heat dissipation effect.

[0032] In this embodiment, the erosion-resistant marine control cable further includes a plurality of end caps 300. The number of end caps 300 is the same as the number of cavities on the inner heat-conducting sleeve 101, and the shape of each end cap 300 is the same as the cross-sectional shape of the cavity perpendicular to the axis of the cable core 100. The radius of the end cap 300 is the same as the radius of the outer heat-conducting sleeve 200. When the cable is adaptively truncated and one of the inner heat-conducting sleeves 101 or outer heat-conducting sleeves 200 is truncated therefrom, the gas in the second cavity 105 of the inner heat-conducting sleeve 101 or the gas in the third cavity 201 of the outer heat-conducting sleeve 200 leaks. At this time, the end cap 300 can be installed on the truncated end face of the cable to block the second cavity 105 or the third cavity 201, and at the same time, gas can be recharged into the truncated inner heat-conducting sleeve 101 or outer heat-conducting sleeve 200, so as to ensure that the cable core 100 can dissipate heat better.

[0033] In this embodiment, the inner sheath further includes an anti-corrosion layer 400 and a shielding armor layer 500. The anti-corrosion layer 400 is sleeved on the outer heat-conducting sleeve 200 to reduce the corrosion of the outer heat-conducting sleeve 200. The shielding armor layer 500 is sleeved on the anti-corrosion layer 400 and is attached to the outer sheath 600. The shielding armor layer 500 is made of anti-corrosion tinned copper wires woven and processed. The shielding armor layer 500 is spirally wound around the anti-corrosion layer 400. The adjustment of the weaving pitch of the tinned copper wires meets the shielding requirements. The shielding armor layer 500 is an integral structure, which effectively shields the electric field interference and plays a shielding role to meet the normal control signal transmission. Its weaving structure has stability and can be used as an armor layer while saving the laying space.

[0034] In this embodiment, adhesives are provided between the outer heat-conducting sleeve 200, the anti-corrosion layer 400, the shielding armor layer 500 and the outer sheath 600 sequentially sleeved on the inner heat-conducting sleeve 101. The adhesives can prevent relative movement between two mutually contacting components and improve the overall tensile strength of the cable.

[0035] The assembly process of a marine erosion-resistant control cable provided by the above embodiment is as follows: The inner heat-conducting sleeve 101, the outer heat-conducting sleeve 200, and the shielding armor layer 500 are all prefabricated parts; when assembling the cable, first open the through groove 107 on the inner heat-conducting sleeve 101 that communicates with the second installation hole 106, so that the strengthening core 700 can pass through the through groove 107 and enter the second installation hole 106. Then, install a cable through the opened through groove 107 into the corresponding first installation hole 102, and then open the remaining through grooves 107 in the same way, and install the remaining cable cores 100 into the corresponding first installation holes 102; or use an inner heat-conducting sleeve 101 composed of multiple sector columns. First, fix the relative positions of the strengthening core 700 and the multiple cable cores 100, and then make the multiple sector columns approach the strengthening core 700 in sequence along the radial direction of the strengthening core 700 until the semi-circular grooves on the sector columns contact the corresponding cable cores 100 and the arc grooves contact the strengthening core 700.

[0036] When installing the outer heat-conducting sleeve 200, open the outer heat-conducting sleeve 200 through the installation groove, and then sleeved it on the inner heat-conducting sleeve 101; then, sleeve the anti-corrosion layer 400 and the shielding armor layer 500 on it in sequence, and then coat the outer sheath 600 on the shielding armor layer 500 through an extrusion mechanism.

[0037] Finally, install the end cap 300 on the cross-section of the cable.

[0038] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0039] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A marine erosion-resistant control cable, characterized in that, It includes a cable core, an inner sheath, and an outer sheath that are sleeved in sequence from the inside to the outside. The inner sheath includes an inner heat-conducting sleeve, which is cylindrical. The axis of the cable core is parallel to the axis of the inner heat-conducting sleeve. A cavity and a plurality of first mounting holes for mounting the cable core are provided on the inner heat-conducting sleeve. The plurality of first mounting holes are evenly distributed around the axis of the inner heat-conducting sleeve. The number of cavities is the same as the number of first mounting holes. Each cavity is located between two radial lines of the inner heat-conducting sleeve that respectively pass through the centers of adjacent first mounting holes. Each cavity is an independent space. The first mounting holes form an arc-shaped protrusion in the cavity. A first partition is provided in the cavity. The first partition divides the cavity into two first cavities that are symmetric in the circumferential direction of the inner heat-conducting sleeve. A plurality of second partitions are provided in each first cavity. One side of each second partition is connected to the inner wall of the inner heat-conducting sleeve, and the other side of each second partition is connected to the protrusion in the corresponding cavity. The plurality of second partitions divide the corresponding first cavity into a plurality of second cavities that are distributed in the circumferential direction around the protrusion. The size of the second cavity is negatively correlated with the distance from the part of the protrusion located in the second cavity to the axis of the inner heat-conducting sleeve. The second cavity is filled with an inert gas, and the pressure in the second cavity is positively correlated with the size of the second cavity; the outer sheath is used to protect the inner sheath.

2. The marine erosion-resistant control cable according to claim 1, characterized in that, One side of the plurality of second partitions connected to the protrusion is distributed in sequence along the circumferential direction of the protrusion, and the plurality of second partitions connected to the protrusion equally divide the protrusion; one side of the plurality of second partitions connected to the inner wall of the inner heat-conducting sleeve is distributed in sequence around the circumferential direction of the inner heat-conducting sleeve, and the plurality of second partitions connected to the inner wall of the inner heat-conducting sleeve equally divide the inner wall of the inner heat-conducting sleeve in the corresponding first cavity.

3. A marine erosion-resistant control cable according to claim 1, characterized in that, A second mounting hole is provided at the center of the inner heat-conducting sleeve. The second mounting hole is not communicated with the first mounting hole and the cavity. The second mounting hole is used to mount a strengthening core.

4. The marine erosion-resistant control cable according to claim 3, characterized in that, A plurality of through grooves equal in number to the first mounting holes are provided on the circumferential surface of the inner heat-conducting sleeve. Each through groove is correspondingly arranged with a first mounting hole, and the through groove penetrates the circumferential surface of the inner heat-conducting sleeve along the radial direction of the inner heat-conducting sleeve and is communicated with the corresponding first mounting hole. One of the through grooves penetrates the first mounting hole and is communicated with the second mounting hole.

5. The marine erosion-resistant control cable according to claim 3, wherein, The inner heat-conducting sleeve includes a plurality of sector columns. The number of sector columns is the same as the number of cable cores. The plurality of sector columns can form a complete cylinder. Semi-circular grooves are provided on the mutually approaching surfaces of two adjacent sector columns in the cylinder. The two semi-circular grooves form a first mounting hole. Each cavity is provided on one sector column. An arc groove is provided at the center of each sector column. The arc groove and the corresponding sector column are coaxial. The arc grooves on the plurality of sector columns after forming the cylinder form the second mounting hole.

6. A marine erosion-resistant control cable according to claim 1, characterized in that, The inner sheath further includes an outer heat-conducting sleeve, which is sleeved on the circumferential surface of the inner heat-conducting sleeve. A plurality of third cavities are provided inside the inner heat-conducting sleeve. A third partition is provided between two adjacent third cavities. The third partition extends along the axial direction of the outer heat-conducting sleeve and is spirally arranged around the axis of the outer heat-conducting sleeve. Each third cavity is filled with an inert gas. The connection line between the two ends of each third partition is parallel to the axis of the outer heat-conducting sleeve.

7. The marine erosion-resistant control cable according to claim 6, characterized in that, There are multiple inner heat-conducting sleeves and outer heat-conducting sleeves, and the multiple inner heat-conducting sleeves and outer heat-conducting sleeves are all arranged along the axial direction of the cable core. The second cavities in the inner heat-conducting sleeves and the third cavities in the outer heat-conducting sleeves are all independent sealed cavities.

8. A marine erosion-resistant control cable according to claim 6, characterized in that, It further includes multiple end caps. The number of end caps is the same as the number of cavities on the inner heat-conducting sleeve, and the shape of each end cap is the same as the cross-sectional shape of the cavity perpendicular to the axis of the cable core. The radius of the end cap is the same as the radius of the outer heat-conducting sleeve.

9. The marine erosion-resistant control cable according to claim 6, characterized in that, The inner sheath further includes an anti-corrosion layer and a shielding armor layer. The anti-corrosion layer is sleeved on the outer heat-conducting sleeve to reduce the corrosion of the outer heat-conducting sleeve. The shielding armor layer is sleeved on the anti-corrosion layer and is attached to the outer sheath. The shielding armor layer is made by braiding anti-corrosion tinned copper wires.

10. A marine erosion-resistant control cable according to claim 9, characterized in that, Adhesives are provided between the outer heat-conducting sleeve, the anti-corrosion layer, the shielding armor layer and the outer sheath that are sequentially sleeved on the inner heat-conducting sleeve.

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