A magnetic field generating device

Abstract

The application discloses a magnetic field generating device, which comprises a shell, an iron core and a coil. The coil is sleeved on the outer peripheral wall of the iron core. The iron core and the coil are arranged in the shell. The shell is provided with a containing cavity. The containing cavity is filled with cooling liquid. The coil is immersed in the cooling liquid. The peripheral wall of the shell is provided with an exhaust port and a liquid inlet port. The exhaust port and the liquid inlet port are both communicated with the containing cavity. The application can improve the heat dissipation effect of the coil under high current density and meet the efficient heat dissipation requirement of the coil.

Description

Technical Field

[0001] This application relates to the technical field of neurointerventional robots, and more specifically, to a magnetic field generating device. Background Technology

[0002] Neurointerventional robots generate a controllable magnetic field by energizing electromagnetic coils, enabling the driving and precise control of magnetic instruments within the body. They can perform millimeter-level or even sub-millimeter-level precision operations in complex scenarios such as neurosurgery, requiring extremely high levels of surgical safety and stability.

[0003] As the core actuator of a magnetic field generator, the electromagnetic coil's operating characteristics directly determine the robot's overall performance. In clinical applications, to achieve rapid response and high-precision magnetic field control, the coil often needs to operate under high-frequency, high-current pulsed or alternating conditions. When operating continuously, the electromagnetic coil often generates a large amount of heat in a short period, causing continuous heat accumulation.

[0004] Currently, common electromagnetic coil cooling solutions mainly include air cooling and liquid cooling. However, in medical robot applications where high power density, high cleanliness, and low noise are required, all methods have significant limitations. Air cooling relies on air convection, but air has poor thermal conductivity and low heat dissipation efficiency, making it difficult to handle the heat load generated by the coil under high frequency and high current. Furthermore, fan operation typically generates noise levels exceeding 45 dB, interfering with communication between medical staff in the operating room. Liquid cooling solutions are divided into indirect contact and direct contact types. Indirect contact relies on the contact between a cold plate and the outer surface of the coil for heat transfer, resulting in high thermal resistance and difficulty in effectively dissipating heat from inside the coil. While direct contact offers high heat transfer efficiency, it suffers from coolant corrosion, leakage, and long-term sealing reliability issues, making maintenance complex and failing to meet the stringent safety and stability requirements of medical equipment. Utility Model Content

[0005] This application provides a magnetic field generating device that can improve the heat dissipation effect of electromagnetic coils under high current density, thereby meeting the high-efficiency heat dissipation requirements of electromagnetic coils.

[0006] The magnetic field generating device provided in this application adopts the following technical solution:

[0007] A magnetic field generating device, comprising:

[0008] The housing has a receiving chamber filled with coolant; the peripheral wall of the housing has an exhaust port and a coolant inlet, both of which are connected to the receiving chamber.

[0009] An iron core is disposed within the housing;

[0010] A coil is disposed within the housing and sleeved on the outer peripheral wall of the iron core, and the coil is immersed in a coolant; the coil includes a first region and a second region, and at least one of the first region and / or the second region of the coil is provided with a plurality of turbulence columns.

[0011] In some technical solutions, multiple coils are provided, and the multiple coils are nested sequentially along the radial direction of the housing, with a gap between adjacent coils.

[0012] In some technical solutions, multiple coils are coaxially arranged, and the gap between two adjacent coils is the same; the axis of the iron core, the axis of the multiple coils, and the axis of the housing coincide.

[0013] In some technical solutions, multiple turbulence pillars form at least two sets of turbulence modules, with adjacent sets of turbulence modules spaced apart and staggered along the axial direction of the coil; each set of turbulence modules includes at least two turbulence pillars.

[0014] In some technical solutions, along the axial direction of the coil, multiple turbulence columns form at least two turbulence profile groups, with the turbulence columns in each turbulence profile group being spaced apart, and the turbulence columns in adjacent turbulence profile groups being staggered.

[0015] In some technical solutions, the baffle column is configured as a flexible column, and the height of the baffle column is less than or equal to 0.4 mm.

[0016] In some technical solutions, the cross-section of the turbulence column is at least partially configured as an arc-shaped structure along a direction parallel to the coil axis.

[0017] In some technical solutions, at least two liquid inlets are provided, wherein the two liquid inlets are respectively provided for the first region and the second region; the orthographic projection of each liquid inlet at least partially coincides with the gap between two adjacent coils.

[0018] In some technical solutions, the housing is further provided with an air chamber communicating with the receiving chamber, the air chamber being located in the top region of the receiving chamber, and the exhaust port being configured on one side of the air chamber.

[0019] In some technical solutions, the surface of the coil is provided with a coating, which is used to reduce the adhesion of air bubbles and cause the air bubbles to detach from the surface of the coil.

[0020] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0021] Low-boiling-point coolant enters the containment chamber through the inlet, allowing the coil to be directly immersed in the low-boiling-point fluorinated coolant. During operation, the coil generates a large amount of heat. When its surface temperature rises to the boiling point of the coolant, the liquid layer adhering to the coil absorbs sufficient heat until the coolant reaches its boiling point, causing a phase change from liquid to gas. The coolant then vaporizes and is discharged from the exhaust port, simultaneously carrying heat away from the coil and preventing it from overheating. The bubbles generated during boiling continuously disturb the liquid layer, disrupting the thermal boundary layer and further enhancing the heat transfer efficiency from the coil surface to the liquid. Since the latent heat of vaporization absorbed by the coolant is far greater than the sensible heat absorbed by single-phase cooling (such as air cooling or water cooling), this application utilizes the heat absorption through the boiling phase change of the coolant on the coil surface. Only a small amount of coolant is needed to handle extremely high heat flux densities, improving the coil's heat dissipation effect and meeting the high-efficiency heat dissipation requirements of electromagnetic coils. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of a magnetic field generating device disclosed in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of a magnetic field generating device, highlighting the coil and the iron core, as disclosed in an embodiment of this application.

[0025] Figure 3 This is a schematic diagram of a magnetic field generating device with multiple coils as shown in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of one embodiment of a magnetic field generating device disclosed in this application, highlighting the coil and the turbulence column.

[0027] Figure 5 This is a schematic diagram of another embodiment of a magnetic field generating device disclosed in this application, highlighting the coil and the turbulence column.

[0028] Figure 6 This is a schematic diagram of a magnetic field generating device disclosed in this application, highlighting the turbulence column structure.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Shell; 11. Receiving chamber; 12. Exhaust port; 13. Liquid inlet; 14. Cylinder; 15. End cap; 16. Air chamber; 2. Iron core; 3. Coil; 31. First region; 32. Second region; 33. Turbulence column; 331. Flow-facing section; 332. Convergence section. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] This application provides a magnetic field generating device that can improve the heat dissipation effect of electromagnetic coils under high current density, thereby meeting the high-efficiency heat dissipation requirements of electromagnetic coils.

[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0034] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] Please see Figure 1 and Figure 2This is one embodiment of the magnetic field generating device in this application. The magnetic field generating device includes a housing 1, an iron core 2, and a coil 3. Both the iron core 2 and the coil 3 are disposed within the housing 1, and the coil 3 is sleeved on the outer peripheral wall of the iron core 2. The coil 3 converts electrical energy into magnetic energy, constructing a controllable spatial magnetic field covering the target area. By adjusting the current of the coil 3 in real time to change the magnetic field vector distribution, remote magnetic force and torque are applied to the pre-installed magnetic components (such as permanent magnets, magnetized needle tips, or magnetorheological actuators) within the device, driving them to perform attitude adjustments, ultimately achieving millimeter-level precise motion control.

[0036] It should be noted that, to achieve rapid response and high-precision magnetic field control, the coil 3 of the neurointerventional robot often needs to operate under high-frequency, high-current pulse or alternating conditions. However, due to the physical limitations of the coil 3 winding resistance, energy loss is inevitably converted into Joule heat, causing the coil 3 temperature to rise continuously. Magnetic field generators often generate a large amount of heat in a short period during continuous operation, leading to continuous heat accumulation. However, high temperatures accelerate the aging and performance degradation of the coil insulation material, reducing insulation strength and increasing the risk of short circuits or breakdowns. Secondly, the thermal expansion and resistivity drift caused by temperature changes alter the electromagnetic parameters of the coil, resulting in decreased accuracy and consistency of the output magnetic field. In severe cases, continuous overheating will trigger a protective shutdown of the system or even cause functional failure, directly threatening the continuity of surgery and patient safety. Traditional heat dissipation methods are difficult to dissipate quickly; magnetic field generators based on electromagnetic coils often need to be shut down for cooling after only a few minutes of operation, otherwise irreversible damage may be caused to the device itself.

[0037] In this application, the housing 1 is cylindrical and has a receiving chamber 11 filled with coolant, in which the coil 3 is immersed. The peripheral wall of the housing 1 is provided with an exhaust port 12 and a liquid inlet 13, both of which are connected to the receiving chamber 11. The exhaust port 12 is used to discharge the coolant after it has vaporized, and the liquid inlet 13 is connected to an external liquid supply device to inject liquid into the receiving chamber 11.

[0038] Understandably, the low-boiling-point coolant enters the receiving chamber 11 through the inlet 13, allowing the coil 3 to be directly immersed in the low-boiling-point fluorinated coolant. When the coil 3 is working, it generates a large amount of heat. When its surface temperature rises to the boiling point of the coolant, the liquid layer in close contact with the coil 3 absorbs enough heat until the coolant reaches its boiling point, causing a phase change from liquid to gas. The coolant then vaporizes and is discharged from the exhaust port 12, carrying away heat from the coil 3 and ensuring that the coil 3 does not overheat. At the same time, the bubbles generated by boiling continuously disturb the liquid layer, destroying the thermal boundary layer, further enhancing the heat transfer efficiency from the surface of the coil 3 to the liquid, improving the heat dissipation effect of the coil 3, and meeting the high-efficiency heat dissipation requirements of the electromagnetic coil 3.

[0039] To facilitate understanding, it's important to note that single-phase cooling relies on the heat transfer through the heating of the liquid or gas, with the efficiency limited by the specific heat capacity and temperature rise of the liquid or air. Two-phase boiling cooling, on the other hand, utilizes the latent heat of vaporization, the heat absorbed when a liquid transforms into vapor at its boiling point. The heat absorbed during vaporization is far greater than the heat absorbed by heating the same mass of liquid; therefore, boiling can carry away significantly more heat than single-phase cooling.

[0040] Because the latent heat of vaporization absorbed by the coolant during vaporization is far greater than the sensible heat absorbed by single-phase cooling (such as air cooling or water cooling), this application utilizes the boiling phase change of the coolant on the surface of coil 3 to absorb heat, resulting in a heat dissipation capacity far exceeding that of traditional convection cooling. This allows for effective control of high heat flux density with minimal coolant usage. Unlike water cooling, this application does not rely on large amounts of coolant and a bulky circulating pump; only a small amount of coolant is needed to handle extremely high heat flux density.

[0041] In this embodiment, the coolant can be a fluorinated liquid or other fluorinated mixture. The insulating and inert fluorinated liquid directly contacts the live parts, which not only improves heat dissipation efficiency but also ensures the high-voltage safety and long-term reliability of the medical robot system.

[0042] In medical robot applications where safety and precision are extremely critical, a comprehensive trade-off must be struck between three key dimensions: electrical safety, heat transfer efficiency, and system compatibility. Specifically, the coolant must possess extremely high dielectric strength and extremely low dielectric constant to ensure that it does not cause electrical breakdown or significantly interfere with the magnetic field distribution when immersed around the high-voltage, high-frequency coil 3. Simultaneously, its boiling point must precisely match the equipment's operating temperature range, and it must possess high latent heat of vaporization to fully leverage the advantages of phase-change heat dissipation. Furthermore, the liquid must be chemically compatible with the coil 3's insulation materials, sealing structures, and other components that are in long-term contact with it, exhibiting no corrosion or swelling, and meeting the stringent requirements of medical applications for non-toxicity, non-flammability, and environmental friendliness.

[0043] Please continue reading. Figure 1 The housing 1 is also provided with a gas chamber 16 communicating with the receiving chamber 11. The gas chamber 16 is located in the top region of the receiving chamber 11, and the exhaust port 12 is disposed on one side of the gas chamber 16. The gas chamber 16 is used to provide a controllable accumulation, buffering and directional discharge channel for the steam generated during the two-phase boiling cooling process, to avoid the disorderly accumulation of steam in the liquid to form gas resistance, which would interfere with the normal wetting and boiling heat transfer of the liquid to the surface of the coil 3, thereby ensuring the pressure balance and continuous heat dissipation inside the housing 1.

[0044] Understandably, when the coil 3 heats up and causes the coolant to boil, the generated steam naturally rises and gathers in the air chamber 16 at the top of the receiving chamber 11. The exhaust port 12 is located on one side of the air chamber 16, which facilitates the steam to be discharged in a directional manner along the designed path. This can maintain the dynamic balance of pressure in the chamber, prevent the boiling point from rising due to increased pressure, and thus reduce the heat dissipation efficiency. It can also prevent steam from splashing or carrying liquid out through the buffering effect of the air chamber 16, thereby reducing the loss of coolant. At the same time, after the steam comes into contact with the top shell 1 in the air chamber 16, it can partially condense and flow back, further realizing the recycling of coolant.

[0045] In this embodiment, the housing 1 consists of a cylindrical body 14 and an end cap 15. The air chamber 16 is specifically located in the top region of the cylindrical body 14, and the liquid inlet 13 is located on the end cap 15. The iron core 2 and the coil 3 are preferably installed inside the cylindrical body 14, and then connected and fixed to the cylindrical body 14 through the end cap 15, thereby realizing the assembly of the iron core 2 and the coil 3.

[0046] Please see Figure 2 and Figure 3 Multiple coils 3 are arranged in a radially nested configuration along the housing 1, with gaps between adjacent coils 3. This radial arrangement of multiple coils 3, compared to a single coil 3, increases the peripheral heat dissipation area per unit axial length, effectively expanding the circumferential and lateral heat exchange surface wettable by the coolant. This allows Joule heat to be transferred to the coolant through a larger contact area. In boiling heat dissipation mode, the radial gaps and additional surfaces provide more nucleation sites for vaporization nuclei, promoting bubble formation and detachment, and enhancing local boiling heat transfer intensity. Simultaneously, the gap structure guides fluid flow and disrupts the thermal boundary layer, reducing convective thermal resistance. Furthermore, the radially nested layout reduces the temperature gradient in the radial direction of the coils 3, preventing the inner windings from accumulating high temperatures due to long heat dissipation paths, resulting in a more uniform temperature distribution among the coils 3. This effectively improves overall heat dissipation capacity and ensures long-term stable operation and consistent magnetic field output of the coils 3 under high current conditions.

[0047] The axes of the iron core 2, the multiple coils 3, and the housing 1 coincide, constructing a highly symmetrical axisymmetric magnetic circuit structure. On the one hand, this ensures that the magnetic field generated by each coil 3 after being energized is consistent in direction and superimposed along the axis. The magnetic field lines can smoothly propagate along the axis of the iron core 2 and return through the housing 1, forming a closed and symmetrical magnetic circuit. This avoids uneven magnetic flux distribution and increased leakage magnetic field caused by eccentricity or misalignment, and improves the accuracy and controllability of the magnetic field output. On the other hand, it simplifies the positioning and assembly of the coils 3 and the housing 1, making the force on each component uniform. This helps to maintain the stability of the relative position under robot movement or external vibration conditions and avoids additional torque or vibration caused by eccentricity.

[0048] Furthermore, multiple coils 3 are coaxially arranged with the same gap between adjacent coils 3, which makes the heat generated by the coils 3 evenly distributed in the circumferential direction. Combined with the radial nested layout, a regular heat transfer path can be formed, avoiding local heat accumulation caused by uneven gaps. This is conducive to the coolant achieving balanced heat exchange between different areas, significantly improving the uniformity of the overall temperature field, thereby ensuring the reliability and safety of the system's long-term high-precision operation.

[0049] Specifically, in this embodiment, there are three coils 3, with the diameter of the three coils gradually increasing from the inside to the outside. The three coils 3 are coaxially arranged, and the gap between two adjacent coils 3 is the same. The axis of the iron core 2, the axis of the three coils 3 and the axis of the housing 1 coincide.

[0050] Furthermore, the surface of coil 3 is provided with a coating, preferably a fluoride-repellent coating, which is used to reduce the adhesion of air bubbles and allow the air bubbles to detach from the surface of coil 3.

[0051] Please see Figure 3 and Figure 4 The coil 3 includes a first region 31 and a second region 32, and at least one of the first region 31 and / or the second region 32 of the coil 3 is provided with a plurality of turbulence columns 33. The first region 31 and the second region 32 are areas where bubbles easily accumulate after the coolant vaporizes. In this embodiment, the first region 31 and the second region 32 are the top region and the bottom region of the coil 3 after it is laid flat. The first region 31 includes the inner and outer peripheral walls at the top region of the coil 3, and the second region 32 includes the inner and outer peripheral walls at the bottom region of the coil 3.

[0052] To prevent bubbles generated during boiling from accumulating and merging at the top of the gap to form an insulating vapor film, multiple turbulence columns 33 are provided in the first region 31 and / or the second region 32 where bubbles are prone to accumulate in the coil 3. These turbulence columns 33, acting as obstacles in the coolant flow channel, physically divide rising large bubbles into finer bubbles, increasing the total surface area of ​​the bubbles and thus improving the heat transfer efficiency per unit volume of fluid. Simultaneously, the micro-amplitude high-frequency vibrations generated by the turbulence columns 33 under the impact of flow pulsation continuously apply shearing force to the bubbles attached to the surface of the coil 3, disrupting their stable adhesion and effectively inhibiting the merging of bubbles into a large-area vapor film on the surface of the coil 3. This ensures that the surface of the coil 3 is always wetted by coolant and maintains a highly efficient nucleate boiling state. Furthermore, the vibration of the turbulence columns 33 continuously disturbs the thermal boundary layer, promoting the homogenization of the temperature field on the surface of the coil 3 and suppressing the formation of localized hot spots.

[0053] In this embodiment, each coil 3 has multiple turbulence columns 33 in its first region 31 and second region 32, which can maintain a stable boiling heat transfer coefficient, significantly improve the critical heat flux density limit, and ensure that the coil 3 can maintain safe, reliable and efficient heat dissipation performance under extremely high heat load.

[0054] In some other embodiments, one, two, or three coils 3 may be provided with turbulence pillars 33 among the plurality of coils 3. Each coil 3 may have turbulence pillars 33 provided in a first region 31 or in a second region 32, and so on.

[0055] To further enhance the effect of the spoiler column 33, please refer to Figure 4 In some embodiments, along the axial direction of coil 3, multiple turbulence columns 33 form at least two turbulence line groups. The turbulence columns 33 in each turbulence line group are spaced apart, and the turbulence columns 33 in adjacent turbulence line groups are staggered. It can be understood that the spaced arrangement of turbulence columns 33 in the same group forms a primary interception array along the flow direction, while the staggered arrangement of turbulence columns 33 in adjacent turbulence line groups fills the escape channels for bubbles that may exist in a single array. This causes the coolant and bubbles to undergo multiple directional deflections and velocity changes as they flow through, applying continuous cutting, twisting, and shearing actions to the rising or migrating bubbles. This effectively prevents small bubbles from merging into large bubbles along the streamline, while disrupting the continuous spatial conditions required for large bubbles to stably adhere to the wall surface, keeping the bubble diameter within a small range, thereby maintaining a large gas-liquid interface area to promote heat transfer.

[0056] Please see Figure 5 In some other embodiments, multiple turbulence columns 33 form at least two sets of turbulence modules, with adjacent sets of turbulence modules spaced apart and staggered along the axial direction of coil 3. It is understood that the spacing between the turbulence modules provides space for the redistribution and release of bubbles, preventing bubbles from continuously accumulating and merging in a single array; while the staggered arrangement of adjacent turbulence modules along the axial direction of coil 3 causes bubbles to be subjected to a second or even multiple cuts and deflections by the staggered columns when they enter the next module after being released from one module. This alternating arrangement effectively eliminates straight-through channels that may form in a single array, forcing bubbles to move along a zigzag path, increasing the number of deformations and breakages of bubbles during axial flow.

[0057] Each turbulence module includes at least two turbulence columns 33, which enhance the shearing effect in the local area, increase the probability of bubble splitting, and maintain an efficient gas-liquid mixing and heat exchange state throughout the entire coil length, avoiding the deterioration of heat exchange in the later stage due to the increase in bubble size or uneven distribution along the path.

[0058] It is worth mentioning that, through spatial topology optimization, the staggered arrangement of multiple turbulence columns 33 constructs a multi-level, three-dimensional bubble disruption and flow diversion structure, significantly improving the ability to control the gas-liquid two-phase flow. The high-speed inflow of coolant, in conjunction with the turbulence columns 33, can guide the liquid flow to form local jets and vortices between the turbulence columns 33, continuously scouring the surface of coil 3, avoiding the thickening of the thermal boundary layer, achieving a more uniform flow field distribution and more efficient interphase mixing, significantly suppressing bubble aggregation and covering effects, increasing the critical heat flux density, and ensuring the long-term stable operation of coil 3 under high heat flux density.

[0059] In this embodiment, the turbulence column 33 is configured as a flexible column with a height less than or equal to 0.4 mm. The flexible material endows the turbulence column 33 with adaptive micro-motion capability under liquid flow turbulence, disrupting the three-phase contact line at the bubble attachment point, effectively inhibiting bubble pinning and growth on the column surface, accelerating bubble detachment, and continuously disturbing the thermal boundary layer, thereby enhancing the boiling heat transfer coefficient. The height setting of 0.4 mm or less is suitable for the compact, high-precision magnetic control structure in medical robots, reducing the impact on coolant flow; on the other hand, it ensures that the turbulence column 33 is completely immersed in the near-wall thermal boundary layer, so that its disturbance effect is precisely applied to the area with the largest temperature gradient and the most concentrated thermal resistance, while avoiding unnecessary flow resistance in the mainstream area caused by an excessively tall column.

[0060] Along a direction parallel to the axis of coil 3, the cross-section of the turbulence column 33 is at least partially configured as an arc-shaped structure. Compared with right angles or sharp edges, the arc-shaped profile eliminates flow stagnation points on the front side and flow separation zones on the back side, allowing coolant and bubbles to circulate around the column surface of the turbulence column 33 with smoother trajectories. This reduces the possibility of bubbles accumulating and adhering due to eddy current retention, significantly lowers the probability of bubble adhesion and motion resistance on the column surface, optimizes local flow characteristics, and thus improves the smoothness of gas-liquid two-phase flow and the stability of boiling heat transfer.

[0061] In some embodiments, the cross-section of the turbulence column 33 is preferably circular, semi-circular, or elliptical. The circular or elliptical cross-section allows the bubbles to deflect and change direction rapidly after contacting the column, which helps maintain the dispersion of fine bubbles, increases the gas-liquid contact area, and enhances the phase change heat transfer.

[0062] Please see Figure 6In some other embodiments, the cross-section of the turbulence column 33 is provided with a flow-facing portion 331 and a confluence portion 332 along the direction of coolant flow. The flow-facing portion 331 is arc-shaped, and the confluence portion 332 is conical. The arc-shaped surface of the flow-facing portion 331 can guide the coolant and the carried air bubbles to flow around in a smooth streamline, avoiding the formation of a high-pressure stagnation zone on the front of the column, reducing flow resistance and reducing the probability of air bubbles staying and adhering there. The confluence portion 332 is conical, and by utilizing the acceleration effect generated by the narrowing, a local low-pressure zone is formed behind the column of the turbulence column 33, which applies a suction force pointing towards the mainstream area to the air bubbles that flow around to the back surface, accelerating their desorption from the surface of the turbulence column 33 and their re-entry into the liquid flow. The arrangement of the flow-incoming part 331 being arc-shaped and the flow-merging part 332 being conical allows bubbles to pass through quickly, deform, and detach after contacting the column, effectively preventing bubbles from accumulating and merging at the tail of the column. At the same time, it reduces the flow separation zone and vortex retention zone behind the conventional blunt body, lowering the risk of bubbles being drawn into the recirculation zone.

[0063] Please continue reading. Figure 1 At least two liquid inlets 13 are provided, with the two liquid inlets 13 respectively located in the first region 31 and the second region 32; the orthographic projection of each liquid inlet 13 at least partially coincides with the gap between two adjacent coils 3. It can be understood that by designing the liquid inlets 13 in the first region 31 and the second region 32 where bubbles are prone to accumulate, and by allowing the liquid inlets 13 to cover the gap between the coils 3, the coolant can flow in simultaneously from both the top and bottom sides, flowing through the top and bottom of the gap. On the one hand, the flowing coolant can directly flush the bubble accumulation area, efficiently driving the generated steam to the gas collection chamber 16, effectively avoiding the local retention of bubbles on the wall surface, and ensuring the long-term stable operation of the system; on the other hand, the flowing coolant can also enhance the convective heat transfer coefficient between the coolant and the coils 3, further improving the heat transfer efficiency.

[0064] The various embodiments in this specification are described in a progressive or parallel manner, with each embodiment focusing on its differences from other embodiments. Similar or undescribed parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A magnetic field generating device, characterized in that, include: The housing has a receiving chamber filled with coolant; the peripheral wall of the housing has an exhaust port and a coolant inlet, both of which are connected to the receiving chamber. An iron core is disposed within the housing; A coil is disposed within the housing and sleeved on the outer peripheral wall of the iron core, and the coil is immersed in a coolant; the coil includes a first region and a second region, the first region and the second region being the top region and the bottom region of the coil when it is laid flat, respectively; the first region includes the inner and outer peripheral walls at the top region of the coil, and the second region includes the inner and outer peripheral walls at the bottom region of the coil; the first region and / or the second region of the coil are provided with a plurality of turbulence columns.

2. The magnetic field generating device according to claim 1, characterized in that, The coil is provided in multiple ways, and the multiple coils are nested sequentially along the radial direction of the housing, with a gap between adjacent coils.

3. The magnetic field generating device according to claim 2, characterized in that, The multiple coils are coaxially arranged, and the gap between two adjacent coils is the same; the axis of the iron core, the axis of the multiple coils, and the axis of the housing coincide.

4. The magnetic field generating device according to claim 1, characterized in that, The plurality of the turbulence columns form at least two sets of turbulence modules, with adjacent sets of turbulence modules spaced apart and staggered along the axial direction of the coil; each set of turbulence modules includes at least two turbulence columns.

5. The magnetic field generating device according to claim 4, characterized in that, Along the axial direction of the coil, a plurality of the turbulence columns form at least two turbulence profile groups, with the turbulence columns in each turbulence profile group being spaced apart, and the turbulence columns in adjacent turbulence profile groups being staggered.

6. The magnetic field generating device according to claim 4, characterized in that, The turbulence-disrupting column is configured as a flexible column, and the height of the turbulence-disrupting column is less than or equal to 0.4 mm.

7. The magnetic field generating device according to claim 4, characterized in that, Along a direction parallel to the axis of the coil, the cross-section of the turbulence column is at least partially configured as an arc-shaped structure.

8. The magnetic field generating device according to claim 5, characterized in that, The liquid inlet is provided with at least two, wherein the two liquid inlets are respectively provided for the first region and the second region; the orthographic projection of each liquid inlet at least partially coincides with the gap between two adjacent coils.

9. The magnetic field generating device according to claim 1, characterized in that, The housing is further provided with an air chamber communicating with the receiving chamber. The air chamber is located in the top region of the receiving chamber, and the exhaust port is located on one side of the air chamber.

10. The magnetic field generating device according to claim 1, characterized in that, The surface of the coil is provided with a coating, which is used to reduce the adhesion of air bubbles and cause the air bubbles to detach from the surface of the coil.

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