A flexible filled core polar environment freeze control cable

Abstract

The present application relates to the technical field of cable, and discloses a flexible filling core's extremely cold environment freeze resistance control cable, aiming at solving the problem of loose structure and electrical performance decline of the existing cable in extremely cold environment, the cable takes the flexible filling core as the core, the flexible filling core center through hole is through the flexible conducting pipe with the communication hole, and the pipe is filled with anti-freezing filling liquid;The conductor wire core of the flexible filling core is spirally wound around the conductor insulation layer, and the outer side is provided with a foaming filling layer, a leakage sealing layer and an insulation protection layer in sequence, the flexible conducting pipe can also be connected with an external heating circulating module, and the liquid temperature can be accurately controlled, which can prevent the material from hardening and embrittlement in extremely cold environment, maintain the internal structure compact, and improve the cold resistance and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable, in particular to a flexible filling core's freezing control cable in extremely cold environment. BACKGROUND

[0002] The control cable in the prior art often faces many technical problems in extremely cold environment. When the environmental temperature is extremely low, the materials inside the cable are prone to hardening, embrittlement, and even shrinkage, resulting in loose structure of the cable, reduced electrical performance, and shortened service life. For example, the insulating material inside the cable may lose elasticity at low temperature, the bending resistance may be poor, and the cable may be prone to cracking. In addition, due to material shrinkage, the cable may generate voids inside the cable in extremely cold environment, reducing the stability of the cable operation and increasing the risk of damage.

[0003] Some existing cold-resistant cables mainly solve the low-temperature problem by selecting low-temperature-resistant materials or adding external protective layers, but this often increases the cost and complexity of the cable, and the stability and protection capability of the internal structure of the cable in extremely low temperature are limited. In particular, in extremely cold environment at-60℃ or even lower temperature, simple cold-resistant materials or external protection cannot completely solve the problems of loose structure and unstable electrical performance caused by material shrinkage and stress concentration inside the cable. Moreover, when the cable works in extremely cold environment for a long time, if the internal part cannot maintain a constant antifreeze or constant temperature state, the reliability and safety of the cable will be greatly reduced. SUMMARY

[0004] The technical problem to be solved by the present application is that the existing cable is prone to loose structure, reduced electrical performance, and other shortcomings in extremely cold environment. To solve this problem, the present application provides a flexible filling core's freezing control cable in extremely cold environment.

[0005] To achieve the above purpose, the present application adopts the following technical scheme: a flexible filling core's freezing control cable in extremely cold environment, comprising: a flexible filling core, at least one conductor core is spirally wound around the flexible filling core, each conductor core is wrapped with a conductor insulation layer, the conductor core and the conductor insulation layer are wrapped with a leak-proof sealing layer outside, a foaming filling layer is filled between the flexible filling core, the conductor insulation layer and the leak-proof sealing layer, the leak-proof sealing layer is wrapped with an insulation protective layer outside, a through hole is formed in the center of the flexible filling core, a flexible through pipe is penetrated in the through hole, a plurality of communication holes are densely formed on the flexible through pipe, plugs are arranged at both ends of the flexible through pipe, and antifreeze filling liquid is filled in the flexible through pipe, the antifreeze filling liquid is immersed in the flexible filling core through the communication holes.

[0006] Further, the flexible filling core is made of flexible sponge material, and the density of the flexible sponge is 20-50kg / m³.

[0007] Further, the conductor core is wrapped outside the flexible filling core with a pre-tightening force of 5-15 N, and the depth of the half-embedded conductor core in the flexible filling core is 1 / 2-2 / 3 of the diameter of the conductor core, and the spacing between adjacent two conductor cores is greater than 2 mm.

[0008] Further, the anti-freezing filling liquid is selected from at least one of dimethyl silicone oil, polyisobutylene, and modified silicone oil, and the freezing point of the anti-freezing filling liquid is lower than -60℃, and the insulation resistance is greater than 10 12 Ω·cm.

[0009] Further, the communication hole of the flexible conducting tube has a hole diameter of 0.5-2 mm, and along the length direction of the flexible conducting tube, 3-5 communication holes are arranged per centimeter.

[0010] Further, the anti-leakage sealing layer is a modified butyl rubber layer or a fluororubber layer, and the thickness of the anti-leakage sealing layer is 1-3 mm, the temperature resistance range is -50℃ to 80℃, and the leakage rate is less than 0.01 mL / 24h.

[0011] Further, the foaming filling layer is a polyurethane foaming layer or a polyethylene foaming layer, and the foaming ratio of the foaming filling layer is 10-20 times, and the thermal conductivity coefficient is less than 0.03 W / (m·K).

[0012] Further, the conductor insulation layer is a cross-linked polyethylene layer or a polytetrafluoroethylene layer, and the thickness of the conductor insulation layer is 0.8-2 mm, the temperature resistance range is -60℃ to 100℃, and the breakdown voltage is greater than 20 kV / mm.

[0013] Further, the cross-sectional shape of the flexible filling core is quadrilateral, pentagonal, or hexagonal, and the number of the conductor cores is consistent with the number of sides of the cross-section of the flexible filling core, and the conductor cores are uniformly distributed along the cross-sectional circumference of the flexible filling core.

[0014] Further, the plug at both ends of the flexible conducting tube is a detachable structure, and the flexible conducting tube can be connected to an external heating and circulating module through the interface at both ends of the plug, the external heating and circulating module can circulate the anti-freezing filling liquid in the flexible conducting tube at a flow rate of 0.5-2 L / min, and the temperature of the anti-freezing filling liquid is controlled at 5-20℃ during the circulation process.

[0015] The technical effects and advantages of this invention are as follows: 1. By setting a flexible conductive tube filled with antifreeze filling fluid in the center of the flexible filler core, and allowing the antifreeze filling fluid to penetrate into the flexible filler core through the connecting hole, continuous antifreeze and heat preservation of the core area inside the cable is achieved. This effectively reduces the material hardening and embrittlement caused by low temperatures in extremely cold environments, and enhances the overall cold resistance of the cable. 2. As a core support, the flexible filler core is tightly bonded to and semi-embedded with the conductor core under pre-tightening force. When the ambient temperature decreases and the conductor core contracts, the flexible filler core is squeezed and releases the antifreeze filling fluid it has absorbed, filling the gaps created by the conductor core contraction, maintaining the tightness of the internal structure of the cable, actively resisting the structural loosening caused by low temperatures, and improving the mechanical stability and reliability of the cable. 3. The detachable plugs and interface design at both ends of the flexible conductive tube allow the cable to be connected to external heating and circulation modules. In extreme low temperatures or when long-term operation is required, the antifreeze filling fluid can be heated and circulated, providing active temperature control to ensure that the inside of the cable is always at a suitable temperature, greatly expanding the cable's application range and environmental adaptability. Attached Figure Description

[0016] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0017] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the flexible filling core of the present invention.

[0018] Legend: 1. Flexible filler core; 2. Conductor core; 3. Conductor insulation layer; 4. Foamed filler layer; 5. Leak-proof sealing layer; 6. Insulating protective layer; 7. Flexible conductive tube; 701. Connecting hole. Detailed Implementation

[0019] The technical solutions in the present application will be described clearly and completely in the present application in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the present application described and shown in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Meanwhile, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0020] Embodiment one: refer to Figure 1 - Figure 3 The present application provides a flexible filling core's extremely cold environment freeze control cable, which comprises a flexible filling core 1, a conductor core 2, a conductor insulation layer 3, a foaming filling layer 4, a leakage-proof sealing layer 5, an insulation protection layer 6 and a flexible lead-through tube 7.

[0021] Specifically, the flexible filling core 1 of the present application is located at the center of the cable, the material of the flexible filling core 1 is flexible sponge, the density range of which is preferably 20-50 kg / m³, for example, polyurethane sponge or silicone rubber sponge can be used, so as to ensure that it still has good elasticity and flexibility in extremely cold environment, and can fully absorb and accommodate the freeze-proof filling liquid, and the cross section of the flexible filling core 1 is quadrilateral to adapt to the arrangement of the four conductor cores 2.

[0022] At least one conductor wire core 2 is spirally wound around the periphery of the flexible filling core 1, and in this embodiment, four conductor wire cores 2 are provided, which are uniformly distributed along the cross-sectional periphery of the flexible filling core 1, and each conductor wire core 2 is wrapped with a conductor insulation layer 3, which is a cross-linked polyethylene layer with a thickness of 1.5 mm, a temperature resistance range of -60℃ to 100℃, a breakdown voltage greater than 20kV / mm, and excellent insulation performance in extremely cold conditions, and the conductor wire core 2 is wrapped and embedded on the outer side of the flexible filling core 1 with a pre-tightening force of 10N, and the depth of the half-embedded conductor wire core 2 in the flexible filling core 1 is 1 / 2-2 / 3 of the diameter of the conductor wire core 2, and in this embodiment, the depth is 1 / 2 of the diameter of the conductor wire core 2, so that the conductor wire core 2 is tightly combined with the flexible filling core 1, and the conductor wire core 2 can effectively extrude the flexible filling core 1 when it shrinks at low temperature, and the spacing between adjacent two conductor wire cores 2 is greater than 2mm, for example, it can be designed as 3mm, to ensure sufficient electrical insulation distance and structural stability, to prevent short circuit or contact when shrinking at low temperature.

[0023] Outside the conductor wire core 2 and the conductor insulation layer 3, a leak-proof sealing layer 5 is wrapped, which is a modified butyl rubber layer with a thickness of 2mm, and this material has excellent low-temperature resistance and sealing performance, with a temperature resistance range of -50℃ to 80℃ and a leakage rate of less than 0.01mL / 24h, effectively preventing the anti-freezing filling liquid from overflowing.

[0024] A foamed filling layer 4 is filled between the flexible filling core 1 and the conductor insulation layer 3 and the leak-proof sealing layer 5, which is a polyurethane foaming layer with a foaming ratio of 15 times and a thermal conductivity less than 0.03W / (m·K), providing good heat preservation and insulation effect, reducing heat loss, helping to maintain the internal temperature and enhance the anti-freezing performance.

[0025] The outer side of the leak-proof sealing layer 5 is wrapped with an insulation protection layer 6, which provides external mechanical protection and insulation for the cable.

[0026] A through hole is provided in the center of the flexible filling core 1, and a flexible through pipe 7 is penetrated through the through hole. As shown in Figure 1 A plurality of communication holes 701 are densely provided on the flexible through pipe 7, and the diameter of the communication hole 701 is 1mm, and 4 communication holes 701 are provided per centimeter along the length direction of the flexible through pipe 7, to ensure that the anti-freezing filling liquid can be uniformly and fully immersed in the flexible filling core 1. The two ends of the flexible through pipe 7 are provided with detachable plugs. The flexible through pipe 7 is filled with anti-freezing filling liquid, which is selected as dimethyl silicone oil with a freezing point lower than -60℃ and an insulation resistance greater than 10¹²Ω·cm, having excellent low-temperature resistance and insulation performance. The anti-freezing filling liquid is immersed in the flexible filling core 1 through the communication hole 701, so that the flexible filling core 1 is fully saturated, thereby providing continuous anti-freezing protection on the entire length of the cable.

[0027] When the ambient temperature decreases, the conductor core 2 will shrink, and since the conductor core 2 is spirally wound in a pre-tightening manner and semi-embedded in the flexible filling core 1, its shrinkage will further extrude the flexible filling core 1, and after being extruded, the anti-freezing filling liquid absorbed inside the flexible filling core 1 will be released to fill the tiny gap generated by the shrinkage of the conductor core 2, thereby maintaining the tightness of the internal structure of the cable and preventing the problem of loose structure caused by low-temperature shrinkage. At the same time, the presence of the anti-freezing filling liquid further enhances the overall heat insulation and anti-freezing effect of the cable. In addition, the plugs at both ends of the flexible through pipe 7 can be connected to an external heating and circulating module, which can circulate the anti-freezing filling liquid in the flexible through pipe 7 at a flow rate of 1 L / min when needed, and the temperature of the anti-freezing filling liquid is controlled at 10°C during circulation. This active heating and circulation mechanism enables the cable to maintain a stable internal temperature through human intervention in extreme or continuous cold environments, ensuring the reliable operation of the cable.

[0028] In this embodiment, the cross-section of the flexible filling core 1 is pentagonal, and five conductor cores 2 are spirally wound, which are uniformly distributed along the circumference of the cross-section of the flexible filling core 1. The material of the flexible filling core 1 is still flexible sponge with a density of 30 kg / m³.

[0029] The conductor insulation layer 3 is a polytetrafluoroethylene layer with a thickness of 1 mm, which has a wider temperature resistance range and more excellent insulation performance.

[0030] The leak-proof sealing layer 5 is a fluororubber layer with a thickness of 1.5 mm, which has stronger temperature resistance and sealing performance, ensuring reliable operation in more severe cold conditions.

[0031] The foamed filling layer 4 is a polyethylene foamed layer with a foaming ratio of 12 times and a thermal conductivity of 0.025 W / (m·K), further improving the heat preservation effect.

[0032] The anti-freezing filling liquid is selected to be polyisobutylene, which has a freezing point much lower than -60°C and excellent insulation resistance. The communication hole 701 of the flexible through pipe 7 has a hole diameter of 0.8 mm, and along the length direction of the flexible through pipe 7, 3 communication holes 701 are arranged per centimeter.

[0033] The conductor core 2 is wrapped in a pre-tightening manner with a force of 8 N, and the semi-embedding depth is 2 / 3 of the diameter of the conductor core 2.

[0034] When the external heating and circulating module is connected, the circulation flow rate is controlled at 0.8 L / min, and the temperature of the anti-freezing filling liquid is controlled at 15°C.

[0035] In this embodiment, the overall performance and reliability of the cable in extremely cold environments are further improved by optimizing the material selection and parameters.

[0036] In this embodiment, the cross section of the flexible filling core 1 is hexagonal, and six conductor cores 2 are spirally wound, which are uniformly distributed along the circumference of the cross section of the flexible filling core 1, and the density of the flexible filling core 1 is 40 kg / m³.

[0037] The conductor insulation layer 3 can be selected as a cross-linked polyethylene layer or a polytetrafluoroethylene layer, and its thickness can be selected between 0.8-2mm, such as 0.8mm.

[0038] The anti-freezing filling liquid is selected as modified silicone oil, which is specially formulated to maintain better fluidity and electrical insulation at very low temperatures.

[0039] The aperture of the communication hole 701 of the flexible conducting tube 7 can be selected between 0.5-2mm, for example 0.5mm, and 3-5 communication holes 701 can be provided per centimeter length, for example 5, and this dense communication hole design can ensure that the anti-freezing filling liquid can be more quickly and uniformly infiltrated into the flexible filling core 1.

[0040] The thickness of the leak-proof sealing layer 5 can be selected between 1-3mm, for example 1mm.

[0041] The foaming ratio of the foaming filling layer 4 can be selected between 10-20 times, for example 20 times. The pre-tightening force of the conductor core 2 can be selected between 5-15N, for example 5N.

[0042] When connecting the external heating and circulating module, the circulation flow is controlled between 0.5L / min to 2L / min, for example 1.5L / min, and the temperature of the anti-freezing filling liquid during circulation is controlled between 5℃ to 20℃, for example 5℃, and this embodiment shows the adjustability of multiple parameters, so that the application can be flexibly configured according to the specific application environment and requirements to achieve the best performance and cost-effectiveness.

[0043] The above only describes the embodiments of the present application and is not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A freeze-resistant control cable for extremely cold environments with a flexible filled core, characterized in that, The device includes a flexible filler core, around which at least one conductor core is spirally wound. The conductor core is wound around the outside of the flexible filler core with a preload of 5-15N, and the conductor core is partially embedded in the flexible filler core to a depth of 1 / 2-2 / 3 of its diameter. The spacing between two adjacent conductor cores is greater than 2mm. Each conductor core is wrapped with a conductor insulation layer. A leak-proof sealing layer is wrapped around the conductor core and the conductor insulation layer. A foam filler layer is filled between the flexible filler core, the conductor insulation layer, and the leak-proof sealing layer. An insulating protective layer is wrapped around the leak-proof sealing layer. A through hole is opened in the center of the flexible filler core, and a flexible conductive tube passes through the through hole. The flexible conductive tube has densely arranged connecting holes. Plugs are provided at both ends of the flexible conductive tube, and antifreeze filling fluid is filled inside the flexible conductive tube. The antifreeze filling fluid is immersed into the flexible filler core through the connecting holes.

2. The extremely cold environment freeze-resistant control cable with flexible filled core according to claim 1, characterized in that, The flexible filling core is made of flexible sponge material, and the density of the flexible sponge is 20-50 kg / m³.

3. The extremely cold environment freeze-resistant control cable with flexible filled core according to claim 1, characterized in that, The antifreeze filler fluid is selected from at least one of dimethyl silicone oil, polyisobutylene, and modified silicone oil, and the freezing point of the antifreeze filler fluid is below -60℃, and the insulation resistance is greater than 10 Ω·cm. 12 Ω・cm.

4. The extremely cold environment freeze-resistant control cable with flexible filled core according to claim 1, characterized in that, The diameter of the connecting hole of the flexible conductive tube is 0.5-2mm, and 3-5 connecting holes are opened per centimeter along the length of the flexible conductive tube.

5. The extremely cold environment freeze-resistant control cable with flexible filled core according to claim 1, characterized in that, The leak-proof sealing layer is either a modified butyl rubber layer or a fluororubber layer, and the thickness of the leak-proof sealing layer is 1-3mm, the temperature resistance range is -50℃ to 80℃, and the leakage rate is less than 0.01mL / 24h.

6. The extremely cold environment freeze-resistant control cable with flexible filled core according to claim 1, characterized in that, The foamed filler layer is a polyurethane foam layer or a polyethylene foam layer, and the foaming ratio of the foamed filler layer is 10-20 times, with a thermal conductivity of less than 0.03 W / (m·K).

7. The extremely cold environment freeze-resistant control cable with flexible filled core according to claim 1, characterized in that, The conductor insulation layer is a cross-linked polyethylene layer or a polytetrafluoroethylene layer, and the thickness of the conductor insulation layer is 0.8-2mm, the temperature resistance range is -60℃ to 100℃, and the breakdown voltage is greater than 20kV / mm.

8. The extremely cold environment freeze-resistant control cable with flexible filled core according to claim 1, characterized in that, The flexible filler core has a cross-sectional shape of quadrilateral, pentagon, or hexagon, and the number of conductor cores is consistent with the number of sides of the flexible filler core's cross-section. The conductor cores are evenly distributed along the circumference of the flexible filler core's cross-section.

9. The extremely cold environment freeze-resistant control cable with flexible filled core according to claim 1, characterized in that, The plugs at both ends of the flexible conduit are detachable, and the flexible conduit is connected to an external heating and circulation module through the interfaces at the plugs at both ends. The external heating and circulation module circulates the antifreeze filling fluid in the flexible conduit at a flow rate of 0.5-2L / min, and the temperature of the antifreeze filling fluid is controlled at 5-20℃ during the circulation process.

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