Flexible intermediate frequency large current liquid-cooled coaxial cable special for platinum electrode

Abstract

This invention belongs to the field of cable technology and discloses a flexible medium-frequency high-current liquid-cooled coaxial cable specifically for platinum electrodes. It includes an inner conductor, an inner cooling channel, an inner insulation layer, an outer conductor, an outer cooling channel, and an outer sheath, all coaxially arranged from the inside out, with connector assemblies fixed at both ends. The inner conductor is a multi-strand enameled copper wire stranded structure; the inner cooling channel is made of a flexible metal hose; the inner insulation layer is made of modified polytetrafluoroethylene (PTFE); the outer conductor is made of silver-plated copper wire; and the outer cooling channel is made of a flexible rubber tube. The connector assembly includes an inner conductor connector, an outer conductor connector, and seals. This invention effectively solves the problems of poor flexibility, insufficient heat dissipation, high reactance, easy electrode damage, and unstable transmission in existing cables adapted to platinum electrodes. It better adapts to medium-frequency high-current transmission, specifically protects platinum electrodes from damage, and also has advantages such as high transmission efficiency, long service life, and strong anti-interference capability.

Description

Technical Field

[0001] This invention belongs to the field of cable-related technology, and more specifically, relates to a flexible medium-frequency high-current liquid-cooled coaxial cable for platinum electrodes. Background Technology

[0002] Platinum electrodes, due to their excellent conductivity, corrosion resistance, and chemical stability, are widely used in various fields such as precious metal smelting, electrochemical synthesis, medical radiofrequency therapy, and high-end scientific research testing. In these applications, platinum electrodes often require medium-frequency (5kHz~20kHz) and high-current (100A~1000A) power supply. Because of the precious material and precise structure of platinum electrodes, the requirements for the matching connecting cables are extremely stringent. These cables must not only achieve stable medium-frequency high-current transmission but also meet core requirements such as flexible installation, efficient heat dissipation (to prevent cable overheating from affecting cable insulation performance), low reactance (to reduce power loss), and strong connector compatibility (to avoid poor contact, wear, or leakage).

[0003] In existing technologies, cables used for high-current transmission mainly include ordinary flexible cables, conventional water-cooled coaxial cables, and medium-frequency power cables. However, none of these cables can fully meet the specific requirements of platinum electrodes, and they have the following prominent problems: (i) Insufficient heat dissipation performance affects the service life of the cable. Ordinary flexible cables do not have a dedicated cooling structure. When transmitting medium-frequency high current, the conductor heats up severely, and the cable temperature rises too high, which not only accelerates the aging of the cable's own insulation layer but also shortens the cable's service life.

[0004] (ii) Insufficient flexibility and poor adaptability. Most conventional water-cooled coaxial cables adopt a rigid structure design, with solid copper conductors and rigid metal tubes for cooling, which cannot achieve 360° flexible bending and makes installation difficult. Although some flexible water-cooled cables have a certain bending ability, the conductor stranding structure is unreasonable, which can easily lead to increased skin effect and increased reactance during medium-frequency high-current transmission. In addition, the outer sheath has insufficient wear resistance and tear resistance, and is easily damaged after frequent bending and dragging, affecting the cable's sealing performance and transmission stability.

[0005] (iii) High reactance and low transmission efficiency. Most existing medium-frequency high-current cables adopt non-coaxial structures or have high dielectric constants in the insulation layer and insufficient conductivity in the conductor material, resulting in a large total reactance of the cable. Under medium-frequency conditions, the loss is significant and the power transmission efficiency is low (usually below 90%). At the same time, reactance fluctuations can cause unstable voltage at the input terminal of the platinum electrode, affecting the working accuracy of the electrode. Especially in scientific research experiments and precision electrochemical machining scenarios, voltage fluctuations can lead to deviations in experimental data and a decrease in processing quality.

[0006] (iv) Inadequate connector design easily damages platinum electrodes. Existing cable connectors are not specifically designed for the structural characteristics of platinum electrodes. Most connectors are made of ordinary metal, resulting in high contact resistance. During medium-frequency, high-current transmission, the connectors are prone to overheating, and their sealing performance is poor, leading to leakage of the liquid cooling medium and contamination of the platinum electrode's working environment. Furthermore, the connector connection method is mostly rigid locking, which easily generates torsional forces during connection. This not only damages the internal structure of the cable but may also scratch the platinum layer on the surface of the platinum electrode, leading to decreased conductivity and reduced corrosion resistance. Correspondingly, the platinum layer of the platinum electrode is fragile; even slight wear can alter its conductivity and even expose the base metal, causing it to lose its original properties.

[0007] (v) Poor material compatibility, failing to meet the working environment requirements of platinum electrodes. The materials of the inner insulation layer, outer sheath, and cooling pipe of existing cables do not fully consider the special working environment of platinum electrodes (such as weak acid and alkali media in electrochemical scenarios, high temperature dust in smelting scenarios, and cleanliness requirements in medical scenarios), and are prone to corrosion, aging, dust adhesion, etc., which will not only affect the service life of the cable, but may also affect the working stability of platinum electrodes through media contamination, electromagnetic interference, etc.

[0008] Furthermore, while existing medium-frequency low-loss cables (such as medium-frequency cables for ships) emphasize low loss and transmission balance, they are mainly designed for shipboard power frequency equipment and do not consider the specific adaptation requirements of platinum electrodes. They lack efficient liquid cooling structures and flexible designs, making them unsuitable for the working scenarios of platinum electrodes. Existing flexible liquid-cooled cables are mainly used in the field of new energy charging. Their structural design, current carrying capacity, and connector type cannot match the medium-frequency high-current transmission and precision connection requirements of platinum electrodes. Moreover, they have not been optimized for the high-temperature resistance and platinum layer protection requirements of platinum electrodes, and cannot be directly applied to platinum electrode matching scenarios.

[0009] Accordingly, it is necessary to make further improvements in this area to better address several technical challenges in the application of platinum electrode-specific cables. Summary of the Invention

[0010] To address one or more of the above-mentioned defects or needs in existing technologies, this invention provides a flexible medium-frequency high-current liquid-cooled coaxial cable specifically for platinum electrodes. By redesigning its overall structure, materials, and performance requirements, and making targeted improvements to the matching connector assembly, this invention not only effectively overcomes the defects in existing technologies such as insufficient cable heat dissipation, poor flexibility, high reactance, poor connector compatibility, and easy damage to platinum electrodes, but also achieves an integrated solution of "flexible and adjustable, high-efficiency liquid cooling, low-reactance transmission, and dedicated connector compatibility." Therefore, it is particularly suitable for the stable and efficient transmission of medium-frequency high currents for platinum electrodes, while better protecting the platinum electrodes and significantly improving their transmission efficiency and service life.

[0011] To achieve the above objectives, according to the present invention, a flexible medium-frequency high-current liquid-cooled coaxial cable for platinum electrodes is provided. The liquid-cooled coaxial cable comprises, from the inside out, an inner conductor, an inner cooling channel, an inner insulation layer, an outer conductor, an outer cooling channel, and an outer insulation layer (i.e., an outer sheath), and is simultaneously fixed at both ends with connector assemblies for connection to a converter, a matching device, or a platinum electrode. The inner conductor is a stranded structure of multiple enameled copper wires, tightly wound around the inside of the inner cooling channel. It serves as the core component for current transmission and also transfers the generated heat to the cooling medium. The internal cooling channel is made of flexible metal hose and serves as the central flow path for the cooling medium. The inner insulation layer is disposed between the inner cooling channel and the outer conductor. It is made of modified polytetrafluoroethylene material and is used to reduce the total reactance of the entire liquid-cooled coaxial cable while providing insulation performance. The outer conductor is made of silver-plated copper wire, and its reverse current is equal in magnitude and opposite in direction to the forward current of the inner conductor, so the magnetic fields generated by the two cancel each other out. The external cooling channel is in the form of a flexible rubber tube, which serves as the medium for cooling water flow and has a reinforced fabric layer to withstand mechanical stress and water pressure impact during operation, and can withstand working water pressure ≥ 0.8MPa; The outer insulation layer, also known as the outer sheath, is made of a wear-resistant and corrosion-resistant flexible material and serves as a mechanical protection and environmental isolation layer. Each of the aforementioned connector assemblies includes an inner connector, an outer connector, and a seal, wherein the inner connector is used to match and install with the inner cooling channel, and is connected to the inner cooling channel via parallel-arranged water nozzles; the outer connector is used to match and fix with the outer conductor to achieve grounding and shielding continuity; the seal is used to ensure complete sealing between the entire connector assembly and the cable; in addition, the inner and outer connectors can be rotated and adjusted according to the connectors of the converter, impedance matching device, or electrode.

[0012] As a further preferred embodiment of the present invention, the external cooling is generally used to form a closed-loop dual cooling circuit with the internal cooling channel, thereby further improving heat dissipation efficiency.

[0013] As a further preferred embodiment of the present invention, the internal cooling channel 2 is preferably made of a metal hose material that is corrosion resistant, has good thermal conductivity and flexibility; The inner diameter of the internal cooling channel is preferably 18mm to 20mm, and the wall thickness is 0.5mm to 1.2mm. The internal cooling channel preferably adopts a flexible structure design, and its bending radius is ≤6D, where D is the outer diameter of the internal cooling channel.

[0014] As a further preferred embodiment of the present invention, the inner conductor is preferably configured with the following stranding structure: the number of strands is 800 to 1200, the diameter of a single wire is 0.1 mm to 0.2 mm, the stranding pitch is controlled to be 8 to 12 times the diameter of a single wire, and the strands are layered with each layer having a pitch ratio controlled to within 12. The multi-strand enameled copper wire of the inner conductor is preferably made of silver-plated oxygen-free copper, wherein the thickness of the silver plating layer is 0.1mm to 0.3mm, the conductivity is ≥98%, and the temperature resistance of the surface paint is ≥150℃. The outer diameter of the inner conductor after stranding is 6mm to 12mm. Its cross-sectional area is designed according to the rated current of the platinum electrode used, and the resistance deviation of each phase conductor is ensured to be <1%.

[0015] As a further preferred embodiment of the present invention, the inner insulation layer is preferably prepared by a precision extrusion process, with a thickness of 2mm to 4mm and an insulation eccentricity of <10%, while ensuring uniform thickness and complete coaxiality with the inner and outer conductors, without any eccentricity or twisting. The inner insulation layer is preferably machined with uniform axial hollow grooves, the width of which is 0.8mm to 1.5mm and the depth is 1 / 3 to 1 / 2 of the thickness of the main insulation layer itself. The thickness of the inner insulating layer is preferably 2mm to 4mm, the dielectric constant is preferably 2.0 to 2.1, and the loss tangent is ≤0.001; The modified polytetrafluoroethylene material of the inner insulation layer preferably contains 0.5% to 1.0% by mass of graphene thermal conductive powder. The insulation eccentricity of the inner insulation layer is preferably <10%, the insulation resistance is ≥5000MΩ / km, and the insulation resistance deviation per phase is <1%.

[0016] As a further preferred embodiment of the present invention, the outer conductor is preferably manufactured using a bidirectional spiral braiding process, wherein the braiding pitch is 5mm to 8mm and the braiding density is ≥95%. The outer conductor has a silver plating layer thickness of 0.08 mm to 0.2 mm and a single wire diameter of 0.1 mm to 0.15 mm. Preferably, an aluminum-plastic composite strip is wrapped around the outside of the silver plating layer of the outer conductor; As a further preferred embodiment of the present invention, the outer insulation layer, i.e. the outer sheath, is preferably prepared by a precision extrusion process, and its thickness is preferably 1.5 mm to 3.0 mm, while anti-slip texture is processed on the outer surface; The inner side of the outer sheath is preferably provided with a non-woven fabric heat insulation layer with a thickness of 0.3mm to 0.5mm and a flame retardant rating of UL94-V0. The outer sheath is preferably made of polyurethane, chlorosulfonated polyethylene or other similar materials, wherein polyurethane is suitable for dynamic working conditions with frequent bending and dragging, and chlorosulfonated polyethylene is suitable for outdoor open-air and mildly corrosive working conditions.

[0017] As a further preferred embodiment of the present invention, the inner diameter of the external cooling channel is preferably designed to be 40mm to 50mm, and the wall thickness is 1.0mm to 1.5mm. The external cooling channel is preferably made of flexible neoprene rubber. The external cooling channel is preferably filled with a thermally conductive adhesive between itself and the external conductor, the thermal conductivity of which is ≥0.8 W / m. K.

[0018] As a further preferred embodiment of the present invention, each of the aforementioned connector assemblies is preferably connected in a torsion-free locking manner; Each of the aforementioned connector assemblies is preferably made of non-magnetic brass and has a silver plating layer with a thickness of 0.1 mm to 0.2 mm. The tensile strength of each of the joint components is preferably ≥60 N / mm². 2 And after the connection is completed, its resistance does not exceed 1.2 times that of a conductor with equal cross-section, that is, the inner conductor and the outer conductor; The seals of each of the joint assemblies are preferably made of fluororubber and have an O-ring structure. They are located at the connection between the inner joint and the inner cooling channel, and between the outer joint and the outer cooling channel, and the working pressure is ≥10 bar.

[0019] As a further preferred embodiment of the present invention, the cooling medium of the above-mentioned liquid-cooled coaxial cable is preferably deionized water, and 0.1% to 0.3% by mass of corrosion inhibitor is added. The working flow rate of the cooling medium is preferably set to 0.8 m / s to 1.2 m / s, and the working pressure is 2 bar to 5 bar, so as to ensure that the temperature rise of the entire cable is ≤30℃.

[0020] In summary, the technical solutions conceived by this invention have the following main technical advantages compared with the prior art: (1) Excellent flexibility and strong adaptability to dynamic working conditions: The inner cooling channel in this invention adopts the form of a flexible metal hose, the inner conductor adopts a tightly twisted structure of multi-strand enameled copper wire, and the outer sheath is made of highly flexible material. At the same time, it can be further combined with optimized twisting pitch and braiding process, so that the cable can achieve 360° flexible bending, bending times ≥10000 times (bending angle ±90°) without damage or leakage; at the same time, the structure of each layer fits tightly with each other without loosening or misalignment. After frequent bending and dragging, it can still maintain stable transmission performance and sealing performance, thus better adapting to the dynamic working and frequent adjustment requirements of platinum electrodes, solving the defect of insufficient flexibility of conventional water-cooled coaxial cables, and different from existing rigid liquid-cooled cables and medium frequency cables with insufficient flexibility; (2) High efficiency of liquid cooling and precise temperature rise control: This invention adopts a dual cooling design of "internal cooling channel as the main channel and external cooling channel as the auxiliary channel". The cooling channel is close to the inner and outer conductors, and the heat can be directly transferred to the cooling medium. The heat dissipation efficiency is more than 30% higher than that of ordinary water-cooled cables and 5 to 10 times higher than that of conventional air-cooled cables. The cooling medium is further optimized in terms of flow rate and pressure to ensure that the cable temperature rise is ≤30℃ when transmitting medium frequency high current (500A-5000A), avoiding aging of the cable insulation layer and performance degradation of platinum electrodes. At the same time, it prevents high salinity solution crystallization from clogging the electrode gap, solving the problem of insufficient heat dissipation of existing cables. It is suitable for the strict requirements of platinum electrodes for working temperature, and is especially suitable for long-term stable operation under ultra-high current conditions. (3) Highly efficient and low reactance characteristics: This invention adopts a coaxial symmetrical structure, with the inner and outer conductor currents canceling each other out, which greatly reduces the excitation inductance; the inner conductor is further selected with high conductivity silver-plated oxygen-free copper, and the stranded structure is optimized to reduce the skin effect and reduce the AC equivalent inductance; the main insulation layer is made of low dielectric constant modified PTFE, which reduces the distributed capacitance and precisely controls the capacitive reactance, making the total reactance of the cable extremely small; at the same time, the coaxiality of each layer structure is high, with no stray capacitance and leakage flux, ensuring that the cable power transmission efficiency is ≥96% under medium frequency (1kHz-10kHz) conditions, the reactive power loss is greatly reduced, the voltage drop is negligible, the power at the input end of the platinum electrode is stable, and the electrode working accuracy is improved. This solves the problem of high reactance and low transmission efficiency of existing medium frequency high current cables, and is adapted to the high-end requirements of platinum electrodes for transmission stability. It is different from conventional high current cables with non-coaxial structure and ordinary insulated cables with high dielectric loss. (4) Good electromagnetic compatibility and strong anti-interference ability: The outer conductor of this invention adopts a high-density silver-plated copper wire braided layer and aluminum-plastic composite tape for auxiliary shielding to achieve 360° full-wrap electromagnetic shielding with a shielding efficiency of ≥85dB. It can effectively suppress the radiation of intermediate frequency signals outward, avoid interference with the work of platinum electrodes, and resist external electromagnetic interference from entering the cable, ensuring the stability of intermediate frequency high current transmission. It is especially suitable for medical equipment, precision scientific research and other scenarios that are sensitive to electromagnetic interference. It solves the problem of poor electromagnetic shielding effect of existing cables, adapts to the needs of precision work of platinum electrodes, and is different from conventional shielded cables with low braid density and ordinary flexible cables without special shielding design. (5) Strong adaptability, specially designed for platinum electrodes, effectively protecting platinum electrodes: This invention perfectly adapts to the interface requirements of platinum electrodes through the adaptability structure of the special connector assembly, the non-torsion locking connection method and the low contact resistance design, avoiding wear of the connector and damage to the platinum layer of the platinum electrode (the platinum layer thickness is only 0.1μm~20μm). At the same time, the cooling medium controls the fluoride ion content to prevent corrosion of the platinum layer, greatly reducing the loss of platinum electrodes and extending their service life. The flexible design of the cable adapts to the working conditions where the platinum electrode frequently adjusts its position, avoiding the displacement or damage of the platinum electrode caused by cable pulling and twisting. It solves the core problem of poor compatibility between existing cables and platinum electrodes and easy damage to the electrodes, and is especially suitable for working scenarios where the platinum electrode current density is <5000A / M². (6) Long service life and low maintenance cost: The core components of this invention are made of weather-resistant, wear-resistant and corrosion-resistant materials. The outer sheath is tear-resistant and puncture-resistant. The inner and outer conductors are silver-plated for corrosion protection. The cooling channels and joint components are corrosion-resistant and tightly sealed, which can effectively resist the influence of dust, water vapor and mild corrosive media. The high-efficiency liquid cooling design and low reactance characteristics reduce the heat loss and aging speed of the cable. The overall service life of the cable is more than twice that of existing similar cables. The special joint components are reliable and easy to disassemble. They have excellent sealing performance and no leakage risk, which can reduce the frequency and cost of maintenance. At the same time, it reduces the replacement frequency of platinum electrodes, further reducing the overall cost of use. In particular, it is suitable for the characteristics of expensive platinum electrode material and high replacement cost. It solves the problem of short service life and high maintenance cost of existing cables, and achieves a double improvement in economic benefits and practicality. (7) Reasonable structure and strong feasibility: The structure of each layer of the present invention is scientifically designed and highly coaxial. The materials are common and readily available, and the manufacturing process is mature (precision extrusion, braiding, stranding, brazing, etc. are all existing mature processes). No special production equipment is required, and large-scale production can be achieved. At the same time, the size, material and cooling structure of each component of the cable can be flexibly adjusted according to the specific rated current, interface specifications and working environment of the platinum electrode to adapt to the usage requirements of different scenarios. It has strong practicality and scalability, and is easy to promote and apply. It can replace the existing imported medium-frequency high-current liquid-cooled cable, realize domestic adaptation, improve the domestic level of platinum electrode supporting equipment, and is especially suitable for military industry, high-end scientific research and other scenarios with high requirements for equipment confidentiality. It solves the problem of high dependence and poor adaptability of existing imported cables, and has significant industrial application value and promotion prospects. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the overall structure of the flexible medium-frequency high-current liquid-cooled coaxial cable for platinum electrodes according to a preferred embodiment of the present invention. Figure 2 This is a cross-sectional view of a flexible, medium-frequency, high-current liquid-cooled coaxial cable specifically designed for platinum electrodes. Figure 3 This is a schematic diagram of the connector assembly of a flexible medium-frequency high-current liquid-cooled coaxial cable for platinum electrodes. In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, specifically: 1-Inner conductor; 2-Inner cooling channel; 3-Main insulation layer; 4-Outer conductor; 5-Outer cooling channel; 6-Outer sheath; 31-Inner connector; 32-Outer connector; 33-Inner cooling channel water nozzle; 34-Seal; 35-Inner connector clamp; 36-Inner connector clamp; 37-Insulation layer; 38-Outer connector clamp; 39-Outer connector clamp; 40-Inner cooling channel water nozzle; 41-Insulation layer; 42-Sheath. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] Figure 1 This is a cross-sectional view of the overall structure of the flexible medium-frequency high-current liquid-cooled coaxial cable for platinum electrodes according to a preferred embodiment of the present invention. Figure 2 This is a cross-sectional view of a flexible, high-current, liquid-cooled coaxial cable specifically designed for platinum electrodes. The following will be referenced. Figure 1 and Figure 2 To explain the invention in more detail.

[0028] See Figure 1 and Figure 2 The flexible medium-frequency high-current liquid-cooled coaxial cable for platinum electrodes according to the present invention includes an inner conductor 1, an inner cooling channel 2, an inner insulation layer 3, an outer conductor 4, an outer cooling channel 5, and an outer insulation layer, i.e., an outer sheath 6, arranged coaxially from the inside to the outside. Connector assemblies are fixedly attached to both ends for connection to a converter, a matching device, or a platinum electrode. These core components will be explained in detail below.

[0029] First, the inner conductor 1 is a stranded structure of multiple enameled copper wires in this invention, and is tightly wound on the inner side of the inner cooling channel 2. It serves as the core component for current transmission and also transfers the generated heat to the cooling medium.

[0030] More specifically, as the core component for medium-frequency high-current transmission, the inner conductor 1 is preferably made of silver-plated oxygen-free copper material with high conductivity and low loss. According to a preferred embodiment of the present invention, the silver plating layer thickness is 0.1-0.3 mm, reducing the skin effect and contact resistance, and the conductivity is ≥98%, which is suitable for medium-frequency high-current transmission requirements. In addition, the surface is coated with a high-temperature resistant paint layer (temperature resistance ≥150℃) to avoid short circuits between copper wires, while improving the flexibility and corrosion resistance after stranding.

[0031] According to another preferred embodiment of the present invention, the inner conductor 1 adopts a tightly stranded multi-strand enameled copper wire structure with 800-1200 strands, a single wire diameter of 0.1-0.2 mm, and a stranding pitch controlled at 8-12 times the single wire diameter. It is layered stranded with each layer's pitch ratio controlled within 12 to ensure tight stranding and conductor flexibility, while avoiding increased skin effect under medium-frequency conditions and reducing AC equivalent inductance. Furthermore, each single wire or bundle of wires has no welding or joints, ensuring uniform and stable conductor resistance.

[0032] Through the above design, the inner conductor 1 is tightly wound around the inner side of the inner cooling channel 2, ensuring a close fit with the inner cooling channel 2 and guaranteeing that the generated heat can be quickly transferred to the cooling medium. Accordingly, according to another preferred embodiment of the present invention, the outer diameter of the stranded inner conductor is 6-12mm, and the conductor cross-sectional area is designed according to the rated current of the platinum electrode, adapting to medium-frequency high-current transmission of 500A-5000A, ensuring that the resistance deviation of each phase conductor is <1%, and improving transmission stability.

[0033] Secondly, the internal cooling channel 2 is made of a flexible metal hose in this invention, serving as the central flow path for the cooling medium. More specifically, the preferred material is, for example, corrosion-resistant, thermally conductive, and highly flexible stainless steel or titanium alloy, suitable for the weak acid and alkali working environments that the platinum electrode may come into contact with, preventing corrosion and leakage of the cooling pipe that could contaminate the electrode. This improves the pressure resistance and flexibility of the hose, preventing breakage or leakage after frequent bending. Furthermore, both ends of the internal cooling channel 2 are preferably fixed to the connector assembly described later using a brazing process, ensuring a tight seal at the brazing point and eliminating any risk of leakage.

[0034] According to a preferred embodiment of the present invention, the inner diameter of the inner cooling channel 2 is preferably designed to be 18mm to 20mm, the wall thickness is 0.5mm to 1.2mm, and a flexible structure design can be adopted with a bending radius ≤6D (D is the outer diameter of the inner cooling channel) to ensure the overall flexibility of the cable.

[0035] According to another preferred embodiment of the present invention, the cooling medium flowing within the inner cooling channel 2 is deionized water, with a fluoride ion content controlled to <10ppm to avoid corrosion of the platinum electrode plating. The working flow rate of the cooling medium is 0.8-1.2m / s, and the working pressure is 2-5bar, enabling rapid heat dissipation from the conductor and ensuring that the cable temperature rise is ≤30℃, thereby guaranteeing that the working temperature of the platinum electrode is <80℃ and preventing platinum layer wear. Furthermore, 0.1-0.3% of corrosion inhibitor can be added to the deionized water to prevent corrosion of the inner cooling channel, outer cooling channel, and connector assembly, extending the service life of the cooling system. Simultaneously, it prevents the corrosion inhibitor from chemically reacting with the platinum electrode, protecting the performance of the platinum electrode.

[0036] Secondly, the inner insulation layer 3 is disposed between the inner cooling channel 2 and the outer conductor 4 in this invention, and is preferably made of modified polytetrafluoroethylene material, which is used to reduce the total reactance of the entire liquid-cooled coaxial cable while providing insulation performance.

[0037] More specifically, the inner insulation layer 3 is made of modified polytetrafluoroethylene (PTFE) material with low dielectric loss, high temperature resistance, and excellent corrosion resistance. It has a dielectric constant of 2.0-2.1 and a loss tangent ≤0.001, reducing cable capacitive reactance and ensuring the total cable reactance is at an extremely low level. Furthermore, 0.5-1.0% graphene thermally conductive powder is preferably added to this modified PTFE material, thereby further improving the thermal conductivity of the main insulation layer, accelerating the transfer of heat from the inner conductor to the cooling medium, and further optimizing the heat dissipation effect without affecting the dielectric properties and flexibility of the main insulation layer itself.

[0038] According to a preferred embodiment of the present invention, the inner insulating layer 3 is prepared by precision extrusion process, with a thickness of 2-4 mm and an insulation eccentricity of <10%, ensuring uniform thickness and complete coaxiality with the inner and outer conductors, without eccentricity or twisting, avoiding stray capacitance and ensuring regular capacitance distribution. According to another preferred embodiment of the present invention, axial hollow grooves are uniformly provided on the inner insulation layer 3. The groove width is 0.8-1.5mm and the groove depth is 1 / 3-1 / 2 of the insulation layer thickness. This does not affect the insulation performance, but increases the flow space of the cooling medium (which can be used as an auxiliary cooling channel). At the same time, it reduces the weight of the cable and improves its flexibility. The insulation resistance of the insulation layer is ≥5000MΩ / km, ensuring no risk of insulation breakdown under medium frequency high current. The insulation resistance deviation of each phase is <1%, ensuring transmission balance.

[0039] Next, for the outer conductor 4, it is made of silver-plated copper wire in this invention, and its reverse current is equal in magnitude and opposite in direction to the forward current of the inner conductor 1, and the magnetic fields generated by the two cancel each other out. Through this design, the excitation inductance of the cable can be greatly reduced, the low reactance characteristics can be further optimized, and the cable fault short-circuit current can be conducted to protect the platinum electrode and equipment safety.

[0040] More specifically, the outer conductor 4, serving as both the current return path and the electromagnetic shielding layer, can be constructed from silver-plated copper wire braided according to a preferred embodiment of the invention. This braiding density is ≥95%, enhancing the electromagnetic shielding effect, preventing intermediate frequency signals from interfering with the platinum electrode's operation, and preventing external electromagnetic interference from entering the cable, thus ensuring transmission stability. Furthermore, an aluminum-plastic composite tape can be wrapped around the outside of the silver-plated copper wire braided layer to further enhance the electromagnetic shielding effect and structural stability. This also prevents the braided layer from loosening, improves the fit between the outer conductor and the outer cooling channel or outer sheath, and avoids noise or poor contact caused by braided layer vibration under intermediate frequency conditions.

[0041] According to another preferred embodiment of the present invention, the silver plating layer of the outer conductor 4 has a thickness of 0.08-0.2mm, the diameter of the braided copper wire is 0.1-0.15mm, and a bidirectional spiral braiding process is adopted with a braiding pitch of 5-8mm to ensure that the outer conductor and the main insulation layer are tightly bonded, while improving the flexibility of the cable and preventing the braided layer from becoming loose or broken.

[0042] According to another preferred embodiment of the present invention, the outer diameter of the outer conductor 4 is preferably designed to be 30mm-33mm, and it is coaxially arranged with the inner conductor. The forward current of the inner conductor and the reverse current of the outer conductor are equal in magnitude and opposite in direction.

[0043] Next, the external cooling channel 5 is made of flexible rubber hose in this invention to form a closed-loop dual cooling circuit with the internal cooling channel 2, thereby further improving heat dissipation efficiency.

[0044] More specifically, in order to better suit ultra-high current (1000A) operating conditions, according to a preferred embodiment of the present invention, the outer cooling channel 5 can be made of flexible neoprene rubber hose with an inner diameter of 40mm-50mm and a wall thickness of 1.0mm-1.5mm, forming a dual cooling circuit with the inner cooling channel. Water enters through the inner cooling channel and returns through the outer cooling channel, forming a closed loop, which further improves heat dissipation efficiency and ensures that the cable can still work stably under ultra-high current conditions.

[0045] According to another preferred embodiment of the present invention, the space between the external cooling channel 5 and the external conductor 4 is filled with a thermally conductive filler with a thermal conductivity ≥0.8 W / (m²). K), in this way, the heat transfer of the outer conductor to the cooling medium can be further accelerated, avoiding the heat of the outer conductor from affecting the outer sheath and internal structure, while enhancing the structural stability of the cable and preventing misalignment of the layers.

[0046] Finally, the outer insulation layer, also known as the outer sheath 6, is made of a wear-resistant and corrosion-resistant flexible material in this invention and serves as a mechanical protection and environmental isolation layer.

[0047] More specifically, the outer insulation layer, also known as the outer sheath 6, is wrapped around the outermost layer, serving as a mechanical protection and environmental isolation layer. Depending on the working environment of the platinum electrode, different weather-resistant, wear-resistant, and corrosion-resistant flexible materials can be selected. According to a preferred embodiment of the present invention, polyurethane (PU) or chlorosulfonated polyethylene (CSM, Hypalon) can be selected. Polyurethane (PU) is suitable for dynamic working conditions involving frequent bending and dragging, with wear resistance 3-5 times that of ordinary rubber, outstanding tear and puncture resistance, and a working temperature range of -50℃ to 100℃. Chlorosulfonated polyethylene (CSM) is suitable for outdoor, slightly corrosive working conditions, possessing weather resistance, oil resistance, acid and alkali resistance, and ozone resistance, with a working temperature range of -40℃ to 130℃.

[0048] According to another preferred embodiment of the present invention, the thickness of the outer insulation layer, i.e., the outer sheath 6, is preferably designed to be 1.5-3mm, and the surface is provided with anti-slip texture to improve the grip during installation and dragging, and prevent slippage that could cause the joint to loosen. Furthermore, the outer insulation layer, i.e., the outer sheath 6, is preferably prepared using a precision extrusion process, ensuring a tight fit with the internal structure, free of bubbles and cracks, and possessing excellent sealing performance. This prevents dust, moisture, and corrosive media from entering the cable, while also protecting the internal cooling channels and conductors, preventing mechanical damage, and extending the cable's service life. The flame retardant rating of the outer insulation layer (i.e., the outer sheath 6) reaches UL94-V0, improving safety in use. In addition, a non-woven fabric heat insulation layer with a thickness of 0.3-0.5mm can be provided on the inner side of the outer insulation layer, i.e., the outer sheath 6, to reduce the impact of external ambient temperature on the cable's internal cooling system, while also preventing frictional damage between the outer sheath and the internal structure, improving the cable's flexibility and service life.

[0049] Figure 3 This is a schematic diagram of the connector assembly for a flexible, high-current, liquid-cooled coaxial cable specifically designed for platinum electrodes. The following will combine... Figure 3 To explain the improved design of the connector assembly in more detail.

[0050] like Figure 3 As shown, each connector assembly in this invention includes an inner connector 31, an outer connector 32, and a seal 34, which are used to fit and maintain a proper fit to the connection end face of the platinum electrode. The inner connector 31 is used to maintain a matching installation with the inner cooling channel 2, and is connected to the inner cooling channel 2 via parallel-arranged water nozzles 33 and 40. The outer connector 32 is matched and fixedly connected to the outer conductor 4 to achieve grounding and shielding continuity. The seal 34 is used to prevent leakage of the cooling medium and to prevent external media from entering the interior of the connector assembly. In addition, each connector assembly also includes other components such as inner connector clamps 35 and 36, an insulating layer 37, outer connector clamps 38 and 39, an insulating layer 41, and a sheath 42, which will not be described in detail here.

[0051] More specifically, the aforementioned connector assembly is used for fixed connection to both ends of the cable, and in this invention, it is designed as an improved interface structure specifically adapted to platinum electrodes. According to a preferred embodiment of the invention, it is made of non-magnetic brass material with a silver plating layer (silver plating thickness 0.1-0.2mm) to avoid electromagnetic interference and reduce contact resistance, preventing the connector from overheating.

[0052] According to another preferred embodiment of the present invention, the above-mentioned connector assembly adopts a torsion-free locking connection method, which eliminates torsion during connection, avoiding damage to the internal structure of the cable and wear of the platinum electrode interface caused by torsion. The tensile strength of the connector is not less than 60 N / mm², and the resistance of the connector after crimping does not exceed 1.2 times that of the inner conductor with the same cross-section, ensuring connection reliability and transmission stability. At the same time, it is easy to install and disassemble, adapting to the frequent disassembly and assembly requirements of the platinum electrode.

[0053] Several specific examples will be given below to illustrate the invention more clearly and fully.

[0054] Example 1 A flexible medium-frequency high-current liquid-cooled coaxial cable for platinum electrodes comprises, from the inside out, an inner cooling channel, an inner conductor, a main insulation layer, an outer conductor, and an outer sheath. The cable has dedicated connector assemblies at both ends, and the layers are coaxially arranged.

[0055] The specific structural parameters of this embodiment 1 are designed as follows: Internal cooling channel: Made of multi-layer stainless steel wire braided reinforced flexible stainless steel hose, with an inner diameter of 19mm, a wall thickness of 0.8mm, and a bending radius ≤6D (D is the outer diameter of the internal cooling channel, 25mm); the cooling medium is deionized water with 0.2% added corrosion inhibitor, fluoride ion content <8ppm, working flow rate 1.0m / s, and working pressure 8bar; both ends are fixed to the connector assembly by brazing process, ensuring a tight seal.

[0056] Inner conductor: Made of silver-plated oxygen-free copper enameled wire, with a silver plating thickness of 0.2mm, a single wire diameter of 0.15mm, 1000 strands, layered stranding, with each layer pitch ratio controlled within 10, a stranding pitch of 10mm, an outer diameter of 8mm after stranding, and a conductor cross-sectional area of ​​40mm². It is suitable for 100A-500A medium-frequency high current transmission, with a conductivity of ≥98% and a resistance deviation of <0.8% per phase conductor. The surface of the enameled copper wire is coated with a high-temperature resistant paint layer (temperature resistance 160℃), without welding or joints.

[0057] Insulation layer: Modified PTFE material with 0.8% graphene thermal conductive powder added, dielectric constant = 2.05, loss tangent ≤ 0.001, thickness 3mm, insulation eccentricity < 8%, insulation resistance ≥ 5500MQ / km, insulation resistance deviation per phase < 0.8%; Axial hollow grooves are uniformly arranged on the main insulation layer, with a groove width of 1.2mm and a groove depth of 1mm, and 6 hollow grooves are evenly distributed along the circumference.

[0058] Outer conductor: made of silver-plated copper wire with a silver plating thickness of 0.15mm, a single wire diameter of 0.12mm, a braiding density of 96%, bidirectional spiral braiding, a braiding pitch of 6mm, and an outer diameter of 15mm after braiding; the outer conductor is wrapped with an aluminum-plastic composite tape to enhance the shielding effect and structural stability.

[0059] Outer sheath: Made of polyurethane (PU) material, 2mm thick, with anti-slip texture on the surface, operating temperature range of 50℃-100℃, flame retardant rating UL94-V0; the inner side of the outer sheath has a non-woven heat insulation layer 51, 0.4mm thick, to reduce the influence of ambient temperature.

[0060] Connector assembly: Made of non-magnetic brass with a silver-plated surface (silver plating thickness 0.15mm); the inner connector has a tapered structure with a tapered angle of 30°, suitable for the standard interface of platinum electrodes; the outer connector is fixedly connected to the outer conductor to achieve grounding and shielding continuity; the sealing element is a fluororubber O-ring, with a working pressure ≥10bar; the connector adopts a torsion-free locking connection with a tensile strength ≥65N / mm², and the connector resistance after crimping does not exceed 1.1 times that of the inner conductor with the same cross-section.

[0061] The preparation process of this Example 1 is as follows: Internal cooling channel preparation: Select stainless steel wire braided reinforced flexible stainless steel hose, cut to the preset length (1-5m), grind and clean both ends, and set aside; Inner conductor preparation: Silver-plated oxygen-free copper enameled wire is tightly wound in layers around the outside of the inner cooling channel according to the preset number of strands and stranding pitch. After stranding, it is compacted to ensure that the conductor fits tightly against the inner cooling channel. Preparation of the main insulation layer: A precision extruder is used to extrude modified PTFE material with added graphene thermal conductive powder onto the outside of the inner conductor. The extrusion thickness and eccentricity are controlled. During the extrusion process, an axial hollow groove is formed simultaneously. After cooling and shaping, it is ready for use. Outer conductor preparation: Silver-plated copper wire is braided on the outside of the main insulation layer using a bidirectional spiral braiding process, controlling the braiding density and braiding pitch. After the braiding is completed, an aluminum-plastic composite tape is wrapped around the outside. Outer sheath preparation: The non-woven insulation layer is wrapped around the outside of the outer conductor, and then the polyurethane material is extruded and wrapped around the outside of the insulation layer using a precision extruder to form anti-slip texture, and then cooled and shaped. Connector assembly: Match and install the inner and outer connectors of the connector assembly with the inner cooling channels and outer conductors at both ends of the cable, respectively, and install fluororubber O-rings. Perform a sealing test to ensure there is no leakage. Finished product inspection: The conductivity, insulation performance, sealing performance, flexibility, heat dissipation performance and reactance characteristics of the cable are tested. The cable is considered a finished product after passing the test.

[0062] The usage method of this embodiment 1 is as follows: Connect the connector assemblies at both ends of the cable to the platinum electrode and the power supply equipment respectively, ensuring a firm and tight connection; introduce deionized water with added corrosion inhibitors into the cooling channel, start the cooling circulation system, and control the flow rate and pressure of the cooling medium; start the power supply equipment and adjust it to medium frequency (10kHz-50kHz) and high current (100A-500A) operating conditions, and the cable can achieve stable transmission. At the same time, the cooling system quickly dissipates the heat generated by the conductor, ensuring the temperature stability of the cable and platinum electrode, and adapting to the dynamic working requirements of frequent position adjustments of the platinum electrode.

[0063] Example 2 The difference between Example 2 and Example 1 is that an external cooling channel is added between the outer conductor and the outer sheath to form a dual cooling structure, which is suitable for ultra-high current conditions. The remaining structure and manufacturing process are basically the same. The specific differences are as follows: External cooling channel: Utilizes flexible neoprene rubber tubing with an inner diameter of 20mm and a wall thickness of 1.2mm; the space between the external cooling channel and the external conductor is filled with thermally conductive filler with a thermal conductivity ≥0.9W / (m²). K); The external cooling channel and the internal cooling channel form a closed loop, with water entering through the internal cooling channel and returning through the external cooling channel; Internal cooling channel: inner diameter 6mm, pipe wall thickness 1.0mm, working pressure 10bar, cooling medium flow rate 1.2m / s; Inner conductor: 1200 strands, 10mm outer diameter after stranding, 50mm² conductor cross-sectional area, suitable for 100A-500A medium frequency high current transmission; Main insulation layer: 3.5mm thick, hollow groove width 1.5mm, groove depth 1.2mm; Outer conductor: braiding density 97%, outer diameter after braiding 18mm; Outer sheath: 2.5mm thick, made of chlorosulfonated polyethylene (CSM), with an operating temperature range of 40℃-130℃, suitable for mildly corrosive working conditions.

[0064] This embodiment 2 can achieve the following additional beneficial effects: By adding an external cooling channel and filling it with thermally conductive filler, the heat dissipation efficiency is further improved, ensuring that the cable temperature rise is still ≤30℃ when transmitting high currents of 100A-500A, and the working temperature of the platinum electrode is <80℃; at the same time, the outer sheath is made of chlorosulfonated polyethylene, which enhances the weather resistance and corrosion resistance, making it suitable for outdoor open-air and mildly corrosive platinum electrode applications, such as platinum electrode power supply in precious metal smelting, solving the heat dissipation problem under ultra-high current conditions and the adaptation problem in harsh environments.

[0065] It should be noted that the above two embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

[0066] In summary, the platinum electrode-specific flexible medium-frequency high-current liquid-cooled coaxial cable of the present invention, through redesign of its overall structure, material selection, and performance requirements, and targeted improvements to the matching connector assembly, can not only effectively overcome the defects of the prior art such as insufficient cable heat dissipation, poor flexibility, high reactance, poor connector compatibility, and easy damage to the platinum electrode, but also achieve an integrated solution of "flexible and adjustable, high-efficiency liquid cooling, low-reactance transmission, and special connector compatibility".

[0067] Correspondingly, this liquid-cooled coaxial cable maintains low attenuation even at high power. The cooling channel is located adjacent to the heating conductor, allowing heat to be directly carried away by the flowing cooling medium. The flexible design incorporates multiple fine wires to eliminate the skin effect, and the magnetic fields generated by the opposing currents in the inner and outer conductors cancel each other out, resulting in extremely low magnetizing inductance and minimal interference to external circuits. Furthermore, this liquid-cooled coaxial cable combines excellent flexibility, efficient liquid cooling, and low reactance characteristics, making it suitable for medium-frequency, high-current transmission. It is specifically designed to protect platinum electrodes from damage, offering high transmission efficiency, long service life, and strong anti-interference capabilities. It can be widely used in various fields related to platinum electrodes, including smelting, electrochemistry, medical treatment, and scientific research, thus possessing significant practical value and promising application prospects.

[0068] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flexible intermediate frequency high current liquid cooled coaxial cable for platinum electrodes, characterized in that, The liquid-cooled coaxial cable includes an inner conductor (1), an inner cooling channel (2), an inner insulation layer (3), an outer conductor (4), an outer cooling channel (5), and an outer insulation layer, i.e., an outer sheath (6), arranged coaxially from the inside out. It also has connector assemblies fixed at both ends for connection to a converter, matching device, or platinum electrode. The inner conductor (1) is a stranded structure of multi-strand enameled copper wire and is tightly wound on the inner side of the inner cooling channel (2). It serves as the core component for current transmission and also transfers the generated heat to the cooling medium. The internal cooling channel (2) is made of flexible metal hose and serves as the central flow path for the cooling medium; The inner insulation layer (3) is disposed between the inner cooling channel (2) and the outer conductor (4). It is made of modified polytetrafluoroethylene material and is used to reduce the total reactance of the entire liquid-cooled coaxial cable while providing insulation performance. The outer conductor (4) is made of silver-plated copper wire, and its reverse current is equal in magnitude and opposite in direction to the positive current of the inner conductor (1), and the magnetic fields generated by the two cancel each other out. The external cooling channel (5) is in the form of a flexible rubber tube, which serves as the medium for cooling water flow and has a reinforced fabric layer to withstand mechanical stress and water pressure impact during operation, and can withstand working water pressure ≥ 0.8MPa. The outer insulation layer, also known as the outer sheath (6), is made of a wear-resistant and corrosion-resistant flexible material and is used as a mechanical protection and environmental isolation layer. Each of the aforementioned connector assemblies includes an inner connector (31), an outer connector (32), and a seal (34), wherein the inner connector (31) is used to be matched and installed with the inner cooling channel (2), and is connected to the inner cooling channel (2) by side-by-side water nozzles (33, 40); the outer connector (32) is used to be matched and fixed with the outer conductor (4) to achieve grounding and shielding continuity; the seal (34) is used to ensure complete sealing between the entire connector assembly and the cable; in addition, the inner connector (31) and the outer connector (32) can be rotated and adjusted according to the connectors of the converter, impedance matching device, or electrode.

2. The flexible intermediate frequency large current liquid cooled coaxial cable for platinum electrode special use as claimed in claim 1, wherein, The external cooling channel (5) is used to form a closed-loop dual cooling circuit with the internal cooling channel (2), thereby further improving heat dissipation efficiency.

3. The flexible intermediate frequency large current liquid cooled coaxial cable for platinum electrode special use as claimed in claim 1 or 2, characterized in that, For the internal cooling channel (2), it is preferably made of a metal hose material with good corrosion resistance, thermal conductivity and flexibility; The inner diameter of the internal cooling channel (2) is preferably 18 mm to 20 mm, and the wall thickness is 0.5 mm to 1.2 mm. The internal cooling channel (2) preferably adopts a flexible structure design, and its bending radius is ≤6D, where D is the outer diameter of the internal cooling channel.

4. The flexible intermediate frequency large current liquid-cooled coaxial cable for platinum electrode as claimed in any one of claims 1 to 3, characterized in that, For the inner conductor (1), its stranding structure is preferably set as follows: the number of strands is 800 to 1200, the diameter of a single wire is 0.1 mm to 0.2 mm, the stranding pitch is controlled to be 8 to 12 times the diameter of a single wire, and the strands are layered and the pitch ratio of each layer is controlled to be within 12. The multi-strand enameled copper wire of the inner conductor (1) is preferably made of silver-plated oxygen-free copper, wherein the thickness of the silver plating layer is 0.1mm~0.3mm, the conductivity is ≥98%, and the temperature resistance of the surface paint is ≥150℃. The outer diameter of the inner conductor (1) after stranding is 6mm to 12mm. Its cross-sectional area is designed according to the rated current of the platinum electrode used, and the resistance deviation of each phase conductor is ensured to be <1%.

5. The flexible medium-frequency high-current liquid-cooled coaxial cable for platinum electrodes as described in any one of claims 1 to 4, characterized in that, For the inner insulation layer (3), it is preferably prepared by precision extrusion process, with a thickness of 2mm to 4mm and an insulation eccentricity of <10%. At the same time, it ensures that the thickness is uniform and completely coaxial with the inner conductor (1) and the outer conductor (4), without eccentricity or twisting. The inner insulation layer (3) is preferably machined with uniform axial hollow grooves, the width of which is 0.8mm to 1.5mm and the depth is 1 / 3 to 1 / 2 of the thickness of the main insulation layer itself. The thickness of the inner insulating layer (3) is preferably 2mm to 4mm, the dielectric constant is preferably 2.0 to 2.1, and the loss tangent is ≤0.001; The modified polytetrafluoroethylene material of the inner insulation layer (3) preferably contains 0.5% to 1.0% by mass of graphene thermal conductive powder. The insulation eccentricity of the inner insulation layer (3) is preferably <10%, the insulation resistance is ≥5000MQ / km, and the insulation resistance deviation per phase is <1%.

6. The flexible medium-frequency high-current liquid-cooled coaxial cable for platinum electrodes as described in any one of claims 1 to 5, characterized in that, For the outer conductor (4), it is preferably made by a bidirectional spiral braiding process, wherein the braiding pitch is 5mm to 8mm and the braiding density is ≥95%; The outer conductor (4) has a silver plating layer thickness of 0.08 mm to 0.2 mm and a single wire diameter of 0.1 mm to 0.15 mm. Preferably, an aluminum-plastic composite strip is wrapped around the outside of the silver plating layer of the outer conductor (4).

7. The flexible intermediate frequency large current liquid cooled coaxial cable for platinum electrode as claimed in any one of claims 1 to 6, characterized in that, For the outer insulation layer, i.e. the outer sheath (6), it is preferably prepared by precision extrusion process, and its thickness is preferably 1.5mm to 3.0mm, and anti-slip texture is processed on the outer surface; The inner side of the outer sheath (6) is preferably provided with a non-woven heat insulation layer with a thickness of 0.3mm to 0.5mm and a flame retardant rating of UL94-V0; The outer sheath (6) is preferably made of polyurethane, chlorosulfonated polyethylene or other similar materials, wherein polyurethane is suitable for dynamic working conditions of frequent bending and dragging, and chlorosulfonated polyethylene is suitable for outdoor open-air and mildly corrosive working conditions.

8. The flexible medium-frequency high-current liquid-cooled coaxial cable for platinum electrodes as described in claim 1 or 2, characterized in that, For the external cooling channel (5), its inner diameter is preferably designed to be 40mm to 50mm, and the wall thickness is 1.0mm to 1.5mm; The external cooling channel (5) is preferably made of flexible neoprene rubber; The outer cooling channel (5) is preferably filled with a thermally conductive glue between it and the outer conductor (4), the thermal conductivity of which is > 0.8 W / m K.

9. The flexible intermediate frequency large current liquid cooled coaxial cable for platinum electrode as claimed in any one of claims 1 to 8, characterized in that, For each of the aforementioned connector assemblies, a torsion-free locking method is preferably used for connection; Each of the aforementioned connector assemblies is preferably made of non-magnetic brass and has a silver plating layer with a thickness of 0.1 mm to 0.2 mm. The tensile strength of each of the joint assemblies is preferably > 60 N / mm 2 and after the connection is completed its resistance does not exceed 1.2 times the resistance of a conductor of equal cross-section, i.e. the inner conductor (1), the outer conductor (4). The seal (34) of each of the joint assemblies is preferably made of fluororubber and has an O-ring structure. It is located at the connection between the inner joint (31) and the inner cooling channel (2), and between the outer joint (32) and the outer cooling channel (5), and the working pressure is ≥10 bar.

10. The flexible intermediate frequency large current liquid cooled coaxial cable for platinum electrode as claimed in any one of claims 1 to 9, characterized in that, The cooling medium of the above-mentioned liquid-cooled coaxial cable is preferably deionized water, and 0.1% to 0.3% by mass of corrosion inhibitor is added; The working flow rate of the cooling medium is preferably set to 0.8 m / s to 1.2 m / s, and the working pressure is 2 bar to 5 bar, so as to ensure that the temperature rise of the entire cable is ≤30℃.

Images