Water cooling mechanism for coaxial coil

Abstract

This utility model relates to a water-cooling mechanism for a coaxial coil, belonging to the field of metallurgical equipment cooling technology. The mechanism includes a coaxial conductive water-passing device, a melting coil, a circulating cooling system, and connecting components. The coaxial conductive water-passing device has a conductive core and internal cooling channels. The water inlet and outlet of the melting coil are located inside the device and are connected to the circulating cooling system through the inlet and outlet. This utility model achieves uniform flow of cooling water inside the coil by optimizing the cooling channel layout and structural connections, effectively improving heat dissipation efficiency. Its compact structure and easy installation and maintenance significantly reduce the coil's operating temperature, prevent localized overheating, and extend equipment lifespan, making it particularly suitable for coil cooling in medium-frequency induction heating equipment.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical equipment technology, and in particular to a water-cooling mechanism for a coaxial coil. Specifically, it relates to a high-efficiency cooling system for induction heating devices, and more specifically to a water-cooling mechanism for precise temperature management and heat dissipation protection of coaxial coils in equipment such as vacuum melting furnaces and electric arc furnaces. Background Technology

[0002] In fields such as high-temperature smelting and semiconductor processing, coaxial coils serve as core heating elements. During operation, they generate a large amount of Joule heat due to the intermediate-frequency current, requiring efficient cooling to prevent overheating and damage. Existing water-cooling technologies often employ simple water circuit designs, but these suffer from problems such as unreasonable cooling channel layout, low heat exchange efficiency, and the tendency to form localized hot spots. For example, some traditional coil cooling mechanisms rely on only a single water circuit, and uneven cooling can lead to coil deformation or insulation aging. Furthermore, insufficient precision in the fit between the cooling system and the coil structure further affects heat dissipation. This invention addresses these problems by proposing a coaxial coil water-cooling mechanism with optimized structure and uniform cooling. Utility Model Content

[0003] This invention aims to solve the problems of low heat dissipation efficiency and poor structural coordination of existing coaxial coil water cooling mechanisms. By improving the cooling channel design and connection method, it provides a water cooling mechanism that provides uniform heat dissipation, stable installation, and easy maintenance.

[0004] The above-mentioned utility model objective is achieved through the following technical solution: A water-cooling mechanism for a coaxial coil includes: a coaxial conductive water-passing device, a melting coil, a circulating cooling system, a heating system, and a control system; The coaxial conductive water-passing device is used to conduct current and circulate cooling water. It has a conductive core shaft inside, and the water inlet and outlet of the melting coil are arranged inside the conductive core shaft. The melting coil has an independent cooling water channel inside. The coaxial conductive water-passing device is provided with an inlet and an outlet, with the inlet end connected to the inlet and the outlet end connected to the outlet. The circulating cooling system is connected to the inlet and outlet via pipes, and is used to drive the cooling water to circulate in the cooling water channels of the coaxial conductive water-passing device and the melting coil. The heating system is electrically connected to the conductive core of the coaxial conductive water-passing device via a water-cooled cable, and is used to supply power to the melting coil to generate heat. The control system is connected to the circulating cooling system and the heating system via signals, and is used to collect system operating parameters and control the circulating cooling system and the heating system to perform linkage operations.

[0005] As a further technical solution of this utility model: the melting coil is made of rectangular or circular copper tube with a wall thickness of 1-10 mm and a coil number of 5-30 turns.

[0006] As a further technical solution of this utility model: the control system includes a programmable logic controller (PLC) or an industrial computer, and integrates a temperature sensor, a flow sensor and a pressure sensor. The temperature sensor is arranged on the surface of the melting coil and / or in the internal cooling water channel, the flow sensor is set on the main water inlet of the circulating cooling system, and the pressure sensor is set at the high point or pressure critical node of the circulating cooling system.

[0007] As a further technical solution of this utility model: the control system adopts a fuzzy PID control algorithm, and dynamically adjusts the output power of the heating system and the cooling water flow rate and temperature of the circulating cooling system based on the real-time feedback data of the temperature sensor, flow sensor and pressure sensor.

[0008] As a further technical solution of this utility model: the conductive core of the coaxial conductive water-passing device is made of highly conductive oxygen-free copper or copper alloy, covered with a high-temperature resistant insulating layer, and has a spiral, straight or matrix cooling water flow channel inside.

[0009] As a further technical solution of this utility model: the melting coil is made of copper tube with rectangular or circular cross-section, the tube wall thickness is 1-10 mm, the number of coil turns is 5-30 turns, and the inner diameter of the coil is 100-800 mm.

[0010] As a further technical solution of this utility model: the circulating cooling system includes a variable frequency water pump, a plate heat exchanger, a closed insulated water tank, a precision filter and an electric regulating valve. The cooling water flow rate of the circulating cooling system can be steplessly adjusted within the range of 10-150 liters / minute, and the cooling water temperature control range is 15-45℃.

[0011] As a further technical solution of this utility model: the heating system is a medium-frequency induction heating power supply device with an output frequency range of 1000-3000 Hz and an output power range of 10-1000 kW, and has programmable gradient heating and constant temperature holding functions.

[0012] As a further technical solution of this utility model: it also includes a crucible, a crucible basket, and an insulating plate; the crucible is housed inside the melting coil and is used to hold the material to be heated; the crucible is supported by the crucible basket, and the insulating plate is disposed between the crucible basket and the furnace body for electrical isolation and thermal insulation.

[0013] As a further technical solution of this utility model: the system is applied in a vacuum melting furnace, electric arc furnace or semiconductor crystal growth furnace, with a working temperature range of 1200-2500℃, and can process materials including metals, alloys, ceramics or semiconductor materials.

[0014] In summary, compared with the prior art, the present invention has at least one of the following beneficial technical effects: 1. Extremely high temperature control accuracy and uniformity: Based on "start-then-stop" logic and real-time closed-loop control, the system has a fast response speed and can quickly suppress temperature fluctuations. Experiments show that at a melting temperature of 1500°C, temperature fluctuations can be controlled within ±3°C, which is far superior to traditional systems (usually above ±15°C), effectively avoiding local overheating and temperature unevenness, and greatly improving the material melting quality and impurity decomposition effect.

[0015] 2. Superior system reliability and equipment lifespan: Intelligent linkage control completely eliminates the time difference between heating and cooling, ensuring the coil always operates within a safe temperature range. This significantly reduces the risk of coil deformation and insulation damage caused by thermal stress and fatigue. It is expected to extend the service life of the coil and related equipment by more than 30%.

[0016] 3. Significant energy-saving effect: By cooling on demand (such as automatically reducing cooling power during constant temperature phase) and refined energy management, the ineffective operation of the cooling system is avoided, and the overall energy consumption can be reduced by 20%-30% compared with traditional systems.

[0017] 4. Wide applicability: The system is flexibly designed and can be adapted to various high-temperature processes, from metal smelting (such as titanium and tungsten alloys) to semiconductor processing (such as crystal growth), by adjusting control parameters and component dimensions. It has a wide processing temperature range (1200-2500°C) and broad application prospects.

[0018] This utility model relates to a water-cooling mechanism for a coaxial coil, belonging to the field of metallurgical equipment cooling technology. The mechanism includes a coaxial conductive water-passing device, a melting coil, a circulating cooling system, and connecting components. The coaxial conductive water-passing device has a conductive core and internal cooling channels. The water inlet and outlet of the melting coil are located inside the device and are connected to the circulating cooling system through the inlet and outlet. This utility model achieves uniform flow of cooling water inside the coil by optimizing the cooling channel layout and structural connections, effectively improving heat dissipation efficiency. Its compact structure and easy installation and maintenance significantly reduce the coil's operating temperature, prevent localized overheating, and extend equipment lifespan, making it particularly suitable for coil cooling in medium-frequency induction heating equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the internal structure of the furnace body of this utility model.

[0020] Figure 2 This is a front view of the coaxial conductive water-passing device of this utility model.

[0021] Figure 3 This is a side view of the coaxial conductive water-passing device of this utility model.

[0022] Figure 4 This is the logic flowchart of the control system of this utility model.

[0023] Reference numerals in the attached drawings: 1. Coaxial conductive water supply device; 11. Water inlet; 12. Water outlet; 2. Melting coil; 21. Cooling water channel; 22. Water inlet end; 23. Water outlet end; 3. Conductive mandrel; 4. Crucible; 5. Crucible basket; 6. Insulating plate; 7. First connecting flange; 8. Second connecting flange. Detailed Implementation

[0024] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] Example 1: Reference Figure 1The present invention discloses a water-cooling mechanism for a coaxial coil, comprising: a coaxial conductive water-passing device 1, a melting coil 2, a circulating cooling system, a heating system, and a control system.

[0028] Reference Figure 2 and Figure 3 The coaxial conductive water-passing device 1 is used to conduct current and circulate cooling water. It has a conductive core 3 inside. The water inlet 22 and water outlet 23 of the melting coil 2 are arranged inside the conductive core 3. The melting coil 2 has an independent cooling water channel 21 inside. The coaxial conductive water-passing device 1 is provided with a water inlet 11 and a water outlet 12. The water inlet 22 is connected to the water inlet 11, and the water outlet 23 is connected to the water outlet 12.

[0029] The circulating cooling system is connected to the inlet 11 and outlet 12 via pipes to drive the cooling water to circulate in the cooling water channel 21 of the coaxial conductive water-passing device 1 and the melting coil 2; the heating system is electrically connected to the conductive spindle 3 of the coaxial conductive water-passing device 1 via a water-cooled cable to supply power to the melting coil 2 to generate heat; the control system is connected to the circulating cooling system and the heating system via signal connection to collect system operating parameters and control the circulating cooling system and the heating system to perform linkage operation.

[0030] The control system is configured to execute a "start-then-stop" control logic: during the equipment startup phase, the circulating cooling system is started first, and the heating system is started after the cooling water flow and temperature reach the preset stable threshold; during the equipment shutdown phase, the heating system is stopped first, and the circulating cooling system is stopped after the temperature of the melting coil 2 drops to the preset safe temperature threshold.

[0031] The control system includes a programmable logic controller (PLC) or an industrial computer, and integrates temperature sensors, flow sensors and pressure sensors; the temperature sensors are arranged on the surface of the melting coil 2 and / or in the internal cooling water channel 21, the flow sensors are set on the main water inlet of the circulating cooling system, and the pressure sensors are set at the high point or pressure critical node of the circulating cooling system.

[0032] The control system adopts a fuzzy PID control algorithm, which dynamically adjusts the output power of the heating system and the flow rate and temperature of the cooling water in the circulating cooling system based on real-time feedback data from temperature, flow, and pressure sensors.

[0033] The conductive core 3 of the coaxial conductive water-passing device 1 is made of highly conductive oxygen-free copper or copper alloy, and is covered with a high-temperature resistant insulating layer. Internally, it forms spiral, straight-through, or matrix cooling water channels. The melting coil 2 is made of copper tubing with a rectangular or circular cross-section, a wall thickness of 1-10 mm, 5-30 turns, and an inner diameter ranging from 100-800 mm.

[0034] The circulating cooling system includes a variable frequency water pump, a plate heat exchanger, a closed insulated water tank, a precision filter, and an electric regulating valve. The cooling water flow rate of the circulating cooling system can be steplessly adjusted within the range of 10-150 liters / minute, and the cooling water temperature control range is 15-45℃.

[0035] The heating system is a medium-frequency induction heating power supply device with an output frequency range of 1000-3000 Hz and an output power range of 10-1000 kW. It also has programmable gradient heating and constant temperature holding functions.

[0036] In this embodiment, refer to Figure 1 It also includes a crucible 4, a crucible basket 5, and an insulating plate 6; the crucible 4 is housed inside the melting coil 2 and is used to hold the material to be heated; the crucible 4 is supported by the crucible basket 5, and the insulating plate 6 is set between the crucible basket 5 and the furnace body for electrical isolation and thermal insulation.

[0037] This system is used in vacuum melting furnaces, electric arc furnaces, or semiconductor crystal growth furnaces. Its operating temperature range is 1200-2500℃, and it can process materials including metals, alloys, ceramics, or semiconductor materials.

[0038] In this embodiment, the coaxial conductive water-passing device 1 is the core component for current conduction and cooling water distribution. Its core is the conductive mandrel 3, preferably made of highly conductive oxygen-free copper or a copper alloy to ensure excellent conductivity. The conductive mandrel 3 is externally coated with a high-temperature resistant insulating material layer (such as ceramic or special engineering plastic) to achieve electrical isolation. A key innovation is the integration of carefully designed cooling water channels (such as spiral, straight-through, or more complex matrix types) within the device, which communicate with the inlet and outlet ports 12. The interface connecting the inlet end 22 and outlet end 23 of the melting coil 2 is sealed to the furnace structure via the first connecting flange 7 and the second connecting flange 8. The cooling water inlet 11 and outlet 12 are respectively located at specific positions within the device, ensuring that the cooling water can flow smoothly and unidirectionally along a predetermined path.

[0039] In this embodiment, the melting coil 2 is wound around the outside of the crucible basket 5. The coil itself is made of a copper tube with a rectangular or circular cross-section (typically 5-30 turns). In this embodiment, a circular copper tube is used, and the inside of the copper tube serves as an independent cooling water channel 21. This structure makes the coil both a heating element and a component of its own cooling system. The dimensions of the coil (such as inner diameter and tube wall thickness) can be designed according to the melting capacity and power requirements.

[0040] In this embodiment, the circulating cooling system provides circulation power and heat exchange capacity for the cooling water. It includes a variable frequency water pump (for providing adjustable water flow), a plate heat exchanger (for exchanging heat to the secondary cooling medium), a closed-loop insulated water tank (for storing and stabilizing the cooling water), a precision filter (for removing impurities from the water to prevent clogging), and an electrically controlled regulating valve (for precisely controlling the flow rate). Driven by the pump, the cooling water flows through the entire water-cooling path.

[0041] In this embodiment, the heating system provides medium-frequency electrical energy to the melting coil 2. A medium-frequency induction heating power supply is typically used, which has adjustable output frequency and power, and features a programmable heating curve and constant temperature holding function.

[0042] In this embodiment, the control system is the intelligent core of this invention. The system is built upon a programmable logic controller (PLC) or industrial computer and integrates multiple sensors (temperature, flow, pressure). Its core control strategy is a "start first, then stop" linkage logic: Startup Sequence: After the equipment is powered on, the control system first activates the circulating cooling system. The PLC monitors the cooling water flow rate (via a flow sensor) and the inlet water temperature (via a temperature sensor). Only when these parameters reach and stabilize within preset safety thresholds (e.g., flow rate > 30 L / min, temperature < 30°C) does the control system issue a command to allow or activate the heating system. This ensures that effective cooling capacity is in place before the coils begin to generate significant heat, fundamentally preventing initial heat buildup.

[0043] Operation control: During the heating and melting process, the control system uses an advanced fuzzy PID control algorithm based on the feedback from temperature sensors arranged on the coil surface and in the cooling water channel 21 to dynamically and accurately adjust the output power of the heating system and the water flow rate of the circulating cooling system (by adjusting the water pump frequency or valve opening) to achieve closed-loop precise temperature control.

[0044] Shutdown Sequence: After the melting process is completed, the control system first cuts off the power to the heating system, stopping heating. However, the circulating cooling system does not stop immediately but continues to run until the coil temperature (or return water temperature) drops below a preset safe temperature (e.g., below 80°C), at which point the cooling system automatically stops. This process ensures that the coil and its related components are adequately cooled, eliminating residual heat damage after shutdown.

[0045] The core of this invention's intelligent control strategy lies in constructing a multi-level, closed-loop feedback collaborative control system. This system not only executes a simple "start-then-stop" sequence but also achieves dynamic optimization of the entire thermal management process through advanced algorithms and sensor networks. The system consists of a perception layer, a decision-making layer, and an execution layer.

[0046] In this embodiment, the sensing layer (sensor network) includes a temperature sensing array, a flow sensor, and a pressure sensor, specifically: Temperature sensor array: High-precision temperature sensors are deployed at key nodes, including: Coil temperature sensor: directly mounted on the surface of the melting coil 2 or embedded in its insulation layer, to monitor the coil operating temperature in real time (measurement range 0-2000°C).

[0047] Cooling water temperature sensor: installed at the inlet 11 and outlet 12 of the circulating cooling system to monitor the temperature difference between the inlet and outlet of the cooling water and to calculate the heat load.

[0048] Crucible 4 temperature sensor: non-contact infrared thermometer or immersion thermocouple, to monitor the temperature of the material inside crucible 4 as the ultimate goal of process control.

[0049] Flow sensor: Installed on the main inlet water pipe, it monitors the cooling water flow rate in real time (range 10-150 L / min) to ensure stable flow.

[0050] Pressure sensor: Monitors water pressure at key points in the circulation system (safe threshold 0.5-2 MPa) to prevent abnormal pressure caused by blockage or leakage.

[0051] These sensors transmit real-time data (such as temperature, flow rate, and pressure) to the decision center (PLC), providing a data foundation for intelligent decision-making.

[0052] Decision-making layer (intelligent control algorithm): The core of the control system employs a programmable logic controller (PLC) or an industrial-grade microprocessor, running a multi-level cascaded PID control algorithm or a fuzzy PID control algorithm. This algorithm is not a simple single-point control, but rather treats the entire thermal management system as a multivariable coupled system for collaborative optimization.

[0053] Outer-loop PID control (temperature master control): Using the difference (ΔT) between the set target process temperature (e.g., 1500°C) and the actual detected crucible 4 / coil temperature as input, PID calculations (proportional-integral-derivative) output an intermediate control quantity (e.g., desired heat load or cooling demand). Its discretized PID control function can be expressed as: u(k) = Kp1 * ΔT(k) + Ki1 * ΣΔT(i) + Kd1 * [ΔT(k) - ΔT(k-1)]; Where u(k) is the control output at the k-th sampling time, and Kp1, Ki1, Kd1 are the outer loop PID parameters, which are identified and tuned by the system.

[0054] Inner loop PID control (flow / power regulation): The output of the outer loop serves as the setpoint for the inner loop. The inner loop dynamically adjusts the actuator based on the cooling water flow rate, temperature, and the current state of the heating power supply. Cooling regulation: The speed of the variable frequency water pump and the opening of the electric regulating valve are controlled by PLC to precisely regulate the cooling water flow.

[0055] Heating regulation: The output power and frequency of the intermediate frequency power supply are controlled by PLC.

[0056] This cascade structure enables the system to respond quickly to external disturbances (such as temperature changes caused by feeding) and maintains low temperature overshoot and high stability.

[0057] The execution layer and the "start first, stop later" linkage logic: The programmed sequence of "start first, stop later" is the skeleton of the collaborative control of this utility model, and its specific logical flow is as follows: Figure 4 As shown, and executed via PLC program: 1. Start-up phase (cooling starts first): Upon receiving the start command, the control system first and forcibly starts the circulating cooling system; The PLC monitors the inlet water flow and temperature. The cooling system is considered "stable and ready" only when the flow sensor reading exceeds the preset lower limit (e.g., >30 L / min) and the inlet water temperature is below the preset upper limit (e.g., <35°C). Once the conditions are met, the PLC sends a "start-allow" signal to the heating system, and the intermediate frequency power supply begins to supply power to the melting coil 2 according to the preset gradient to raise its temperature. This sequence completely eliminates the risk of heat accumulation in the coil without cooling.

[0058] 2. Operation Phase (Dynamic Linkage): During the heating and melting process, the aforementioned multi-stage PID controller operates continuously. For example, if the coil temperature sensor detects that the temperature is rising too quickly, the PID algorithm will simultaneously calculate and execute two actions: slightly reduce the heating power and slightly increase the cooling water flow rate, achieving bidirectional synergistic suppression of temperature rise.

[0059] The system also features an energy-saving mode: when entering the constant temperature stage and the temperature fluctuation remains below the threshold for a period of time (e.g., ±2°C for 5 minutes), the PLC automatically instructs the cooling water flow to be reduced to the maintenance level (e.g., 60% of the rated flow) to reduce energy consumption.

[0060] 3. Stopping phase (post-stop cooling): After the process is completed or a stop command is received, the control system first cuts off the power supply to the heating system.

[0061] The circulating cooling system continues to operate at full speed or reduced speed, and the PLC continuously monitors the coil temperature.

[0062] The PLC only issues a command to stop the cooling water pump when the coil temperature drops below a preset safe temperature (e.g., <100°C). This process ensures that residual heat from the coil is completely removed, avoiding residual thermal stress.

[0063] This linkage logic achieves hardware-level protection through electrical interlocking and program interlocking. For example, in the control circuit, the operating status signal of the cooling system (such as the auxiliary normally open contact of the water pump contactor) is a necessary condition for the main circuit contactor coil of the heating system to be energized, ensuring "no cooling, no heating" from the hardware level.

[0064] The implementation principle of this utility model is as follows: This utility model relates to a water-cooling mechanism for a coaxial coil, belonging to the field of metallurgical equipment cooling technology. The mechanism includes a coaxial conductive water-passing device 1, a melting coil 2, a circulating cooling system, and connecting components. The coaxial conductive water-passing device 1 is equipped with a conductive core shaft 3 and internal cooling channels. The water inlet and outlet of the melting coil 2 are located inside the device and are connected to the circulating cooling system through the water inlet and outlet. This utility model achieves uniform flow of cooling water inside the coil by optimizing the cooling channel layout and structural connection, effectively improving heat dissipation efficiency. Its structure is compact, installation and maintenance are simple, it can significantly reduce the coil's operating temperature, avoid localized overheating, and extend the equipment's service life, making it particularly suitable for coil cooling in medium-frequency induction heating equipment.

[0065] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A water-cooling mechanism for a coaxial coil, characterized in that, include: Coaxial conductive water-passing device (1), melting coil (2), circulating cooling system, heating system and control system; The coaxial conductive water-passing device (1) is used to conduct current and flow cooling water. It is equipped with a conductive core (3). The melting coil (2) is equipped with an independent cooling water channel (21). The water inlet (22) and water outlet (23) of the melting coil (2) are arranged inside the conductive core (3). The coaxial conductive water-passing device (1) is provided with an inlet (11) and an outlet (12), the inlet end (22) is connected to the inlet (11), and the outlet end (23) is connected to the outlet (12); The circulating cooling system is connected to the inlet (11) and outlet (12) via pipes, and is used to drive the cooling water to circulate in the cooling water channel (21) of the coaxial conductive water-passing device (1) and the melting coil (2); The heating system is electrically connected to the conductive spindle (3) of the coaxial conductive water-passing device (1) via a water-cooled cable, and is used to supply power to the melting coil (2) to generate heat; The control system is connected to the circulating cooling system and the heating system via signals, and is used to collect system operating parameters and control the circulating cooling system and the heating system to perform linked operations.

2. The water-cooling mechanism for a coaxial coil according to claim 1, characterized in that, The melting coil (2) is made of rectangular or circular copper tubes with a wall thickness of 1-10 mm and a coil number of 5-30 turns.

3. A water cooling mechanism for a coaxial coil according to claim 2, wherein The control system includes a programmable logic controller or an industrial computer, and integrates temperature sensors, flow sensors, and pressure sensors. The temperature sensor is arranged on the surface of the melting coil (2) and / or in the internal cooling water channel (21), the flow sensor is set on the main water inlet of the circulating cooling system, and the pressure sensor is set at the high point or pressure critical node of the circulating cooling system.

4. The water-cooling mechanism for a coaxial coil according to claim 3, characterized in that, The control system employs a fuzzy PID control algorithm to dynamically adjust the output power of the heating system and the flow rate and temperature of the cooling water in the circulating cooling system based on real-time feedback data from the temperature sensor, flow sensor, and pressure sensor.

5. The water-cooling mechanism for a coaxial coil according to claim 1, characterized in that, The conductive core (3) of the coaxial conductive water-passing device (1) is made of highly conductive oxygen-free copper or copper alloy, covered with a high-temperature resistant insulating layer, and has a spiral, straight or matrix cooling water flow channel inside.

6. The water-cooling mechanism for a coaxial coil according to claim 1, characterized in that, The melting coil (2) is made of copper tube with a rectangular or circular cross-section, with a tube wall thickness of 1-10 mm, a coil number of 5-30 turns, and a coil inner diameter range of 100-800 mm.

7. The water-cooling mechanism for a coaxial coil according to claim 1, characterized in that, The circulating cooling system includes a variable frequency water pump, a plate heat exchanger, a closed insulated water tank, a precision filter, and an electric regulating valve. The cooling water flow rate of the circulating cooling system can be steplessly adjusted within the range of 10-150 liters / minute, and the cooling water temperature control range is 15-45℃.

8. The water-cooling mechanism for a coaxial coil according to claim 1, characterized in that, The heating system is a medium-frequency induction heating power supply device with an output frequency range of 1000-3000 Hz and an output power range of 10-1000 kW. It also has programmable gradient heating and constant temperature holding functions.

9. A water-cooling mechanism for a coaxial coil according to any one of claims 1 to 8, characterized in that, It also includes a crucible (4), a crucible basket (5), and an insulating plate (6); the crucible (4) is housed inside the melting coil (2) and is used to hold the material to be heated; the crucible (4) is supported by the crucible basket (5), and the insulating plate (6) is disposed between the crucible basket (5) and the furnace body for electrical isolation and thermal insulation.

10. A water-cooling mechanism for a coaxial coil according to claim 9, characterized in that, This system is used in vacuum melting furnaces, electric arc furnaces, or semiconductor crystal growth furnaces. Its operating temperature range is 1200-2500℃, and it can process materials including metals, alloys, ceramics, or semiconductor materials.

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