Water-cooled one-dimensional alternating uniform magnetic field generating device

Abstract

The application relates to the field of water-cooled magnetic field devices, in particular to a water-cooled one-dimensional alternating uniform magnetic field generating device which comprises a water cooler, a water-cooled coil device and a control box. The water-cooled coil device comprises a coil group, a coil support, a water-cooled shell and end covers. The coil group comprises four coils with the same size, the four coils are coaxially arranged on the coil support in sequence, the coil support is coaxially located in the water-cooled shell, and the two ends of the coil support and the water-cooled shell are both sealed by the end covers, so that the space between the coil support and the water-cooled shell forms a closed water storage cavity. The water-cooled shell is provided with a water outlet and a water inlet for being communicated with the water cooler, and the water-cooled shell is also provided with a wiring port for mounting a waterproof cable joint, the control box is communicated with the coil group through the waterproof cable joint, and the one-dimensional alternating magnetic field is generated. The coil is cooled by the cooling medium, so that the stability of the magnetic field intensity and long-time continuous work are guaranteed.

Description

TECHNICAL FIELD

[0001] The application relates to the field of water-cooled magnetic field devices, in particular to a water-cooled one-dimensional alternating uniform magnetic field generating device. BACKGROUND

[0002] In recent years, researchers have found that alternating magnetic fields show great potential in improving the electrocatalytic performance of nanomaterials, so one-dimensional alternating magnetic field generating devices are widely used in the research fields of magnetic-electric coupling biomaterials and devices and multi-scale nanomaterial catalysis. However, the traditional magnetic field generating device lacks cooling medium inside, which easily leads to rapid overheating of the coil under high current load, affects the stability of the magnetic field strength, and makes the effective working time of the magnetic field device extremely limited. SUMMARY

[0003] The purpose of the application is to provide a water-cooled one-dimensional alternating uniform magnetic field generating device, which cools the coil through a cooling medium to ensure the stability of the magnetic field strength and long-time continuous work.

[0004] The purpose of the application is achieved by the following technical solutions:

[0005] A water-cooled one-dimensional alternating uniform magnetic field generating device, comprising a water cooler, a water-cooled coil device and a control box.

[0006] The water-cooled coil device comprises a coil group, a coil support, a water-cooled shell and end covers.

[0007] The coil group comprises four coils of the same size, which are coaxially arranged in sequence on the coil support, the coil support is coaxially located in the water-cooled shell, and the two ends of the coil support and the water-cooled shell are both sealed by the end covers, so that the space between the coil support and the water-cooled shell forms a sealed water storage cavity.

[0008] The water-cooled shell is provided with a water outlet and a water inlet for communication with the water cooler to form a cooling water circulation, and is also provided with a wiring port for mounting a waterproof cable joint, and the control box is connected with the coil group through the waterproof cable joint to generate a one-dimensional alternating magnetic field.

[0009] The water cooler comprises a water pump for controlling the circulation of cooling water, and further comprises a compressor and a cooling fan for refrigeration to cool the cooling water.

[0010] The coil support comprises a cylindrical thin-walled sleeve, four coils are fixedly installed on the cylindrical thin-walled sleeve, and a flange is arranged on the cylindrical thin-walled sleeve, and the flange is fixedly connected with a flange ring in the water-cooled shell through a coil support fastening screw.

[0011] The flange is located at one side of the middle of the cylindrical thin-walled sleeve, and two coils are arranged on each side of the flange.

[0012] The center distance between the two coils on the same side of the flange is 21mm, and the center distance between the two coils on the two sides of the flange and close to the flange is 73mm.

[0013] The cylindrical thin-walled sleeve and the end faces of the water-cooled shell are in the same plane, the end cover includes a large end cover and a small end cover, the large end cover is fixed on the end face of the water-cooled shell through a large end cover fastening screw, the small end cover is fixed on the large end cover through a small end cover fastening screw, and the small end cover is in sealing engagement with the cylindrical thin-walled sleeve.

[0014] The lower end of the water-cooled shell is provided with a base for supporting the water-cooled coil device to be placed flat on the experimental platform.

[0015] The four coils are all wound by fine copper wires with a diameter of 0.64mm, and the copper wires are arranged in a compact manner, and each turn is neat and orderly, and the number of turns of each coil is about 380 turns.

[0016] The wires of the four coils are connected in parallel and then connected with a waterproof cable joint.

[0017] The control box can output an accurate alternating voltage signal with a frequency of 0-1000Hz and a voltage of 0-48V.

[0018] The beneficial effects of the present application are:

[0019] 1. The present application adopts water cooling technology, and a continuous water circulation refrigeration circuit is formed by the water storage cavity, the water inlet and outlet pipe and the water cooling mechanism in the water-cooled coil device, the heat generated by the coil conductor is rapidly removed by the flow of water and the compressor refrigeration, so that the coil temperature is effectively reduced, the heat dissipation performance of the whole device is improved, the long-term stability of the magnetic field generated by the magnetic field generating device is ensured, and the heat stress is reduced to prolong the service life of the coil.

[0020] 2. The present application adopts four equal-sized coaxial circular coils, and the coils are arranged according to a specific spacing. Compared with the traditional Helmholtz coil composed of two circular coils, the range of the uniform magnetic field is significantly increased, and the uniformity of the magnetic field in the uniform magnetic field region is effectively improved. In addition, the consistency and stability of the magnetic field in the uniform magnetic field region are also significantly improved.

[0021] 3. The present application adopts the threaded connection compression sealing ring to realize the water sealing treatment of the water storage cavity in the water-cooled coil device, which is simple in structure, low in cost and easy to maintain compared with the traditional water-cooled coil device, and effectively prevents the leakage of cooling water. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the overall schematic view of the water-cooled one-dimensional alternating uniform magnetic field generating device of the present application;

[0023] Figure 2 It is the three-dimensional structure schematic view of the coil group and the coil support of the water-cooled coil equipment in the magnetic field generating device of the present application;

[0024] Figure 3 It is the overall front view of the water-cooled coil equipment in the magnetic field generating device of the present application;

[0025] Figure 4 It is the overall left view of the water-cooled coil equipment in the magnetic field generating device of the present application;

[0026] Figure 5 It is the overall right view of the water-cooled coil equipment in the magnetic field generating device of the present application;

[0027] Figure 6 It is the sectional view along A-A of the water-cooled coil equipment in the magnetic field generating device of the present application;

[0028] Figure 7 It is the structure schematic view of the uniform magnetic field region formed by the magnetic field generating device of the present application;

[0029] Figure 8 It is the three-dimensional schematic view of the simulation data distribution of the central plane axial magnetic field intensity of the water-cooled coil equipment in the magnetic field generating device of the present application;

[0030] Figure 9 It is the simulation data distribution nephogram of the central 4×8cm plane axial magnetic field intensity of the water-cooled coil equipment in the magnetic field generating device of the present application;

[0031] Figure 10 It is the time-varying characteristic curve test schematic view of the axial alternating magnetic field amplitude at the center point of the water-cooled coil equipment in the magnetic field generating device of the present application;

[0032] Figures 11 to 13 It is the spatial distribution test result schematic view of the axial alternating magnetic field amplitude in the central 4×8cm plane of the water-cooled coil equipment in the magnetic field generating device of the present application.

[0033] In the figure:

[0034] 1 water-cooled machine; 2 water-cooled coil device; 21 coil set; 211 first coil; 212 second coil; 213 third coil; 214 fourth coil; 22 coil support; 221 cylindrical thin-walled sleeve; 222 fixing ring; 223 fixing ring fastening screw; 224 check ring; 23 water-cooled shell; 231 water outlet; 232 water inlet; 233 wiring port; 234 coil support fastening screw; 24 end cover; 241 large end cover; 242 small end cover; 243 sealing groove between water-cooled shell and large end cover; 244 sealing groove between large end cover and small end cover; 245 sealing groove between small end cover and coil support; 246 large end cover fastening screw; 247 small end cover fastening screw; 25 base; 251 support block; 252 square base plate; 3 control box; S1 cylindrical uniform magnetic field region; S2 central 4x8cm plane. DETAILED DESCRIPTION

[0035] As shown in the detailed description of a water-cooled one-dimensional alternating uniform magnetic field generating device: Figures 1-13

[0036] Referring to the accompanying drawings, the water-cooled one-dimensional alternating uniform magnetic field generating device comprises a water-cooled machine 1, a water-cooled coil device 2 and a control box 3. Figure 1

[0037] Referring to the accompanying drawings, the water-cooled coil device 2 can be further subdivided into a coil set 21, a coil support 22, a water-cooled shell 23, an end cover 24 and a base 25. Figure 1 Figure 6 The base 25 comprises a support block 251 and a square base plate 252 for supporting the entire water-cooled coil device 2 so that it is placed flat on the experimental platform.

[0038] Referring to the accompanying drawings, the coil set 21 comprises four circular coils, namely a first coil 211, a second coil 212, a third coil 213 and a fourth coil 214, which are installed two by two on both sides of the flange of the cylindrical thin-walled sleeve 221. Specifically, as viewed from the perspective of the accompanying drawings, the first coil 211 and the second coil 212 are located on the left side of the flange, and the third coil 213 and the fourth coil 214 are located on the right side of the flange. The fit between each coil and the cylindrical thin-walled sleeve 221 is a transition fit. In addition, the two coils on each side are limited by the shaft shoulder inside the cylindrical thin-walled sleeve 221 and the check ring 224, and are fixed by the outermost fixing ring 222. The fixing ring is provided with a plurality of straight slots in the circumferential direction, and is locked by the fixing ring fastening screw 223 and the thread port in the circumferential direction of the cylindrical thin-walled sleeve 221.

[0039] Figure 2 Figure 2

[0040] ​​​​​​In practical applications, the center-to-center distance between the second coil 212 and the third coil 213 is 73 mm, the center-to-center distance between the first coil 211 and the second coil 212 is 21 mm, and the center-to-center distance between the third coil 213 and the fourth coil 214 is also 21 mm. (See attached diagram.) Figure 7 The entire coil assembly 21 can form a sufficiently uniform and large cylindrical uniform magnetic field region S1. In this embodiment, detailed simulation and test data will be provided to verify the field strength uniformity and stability of this magnetic field region.

[0041] See attached document Figure 3 To be continued Figure 6 The coil support 22 is installed inside the water-cooled housing 23, and the two end surfaces of the coil support 22 and the water-cooled housing 23 are flush. Specifically, the cylindrical thin-walled sleeve 221 in the coil support 22 has multiple through holes on its flange flange, which are locked to the internal flange ring of the water-cooled housing 23 by the coil support fastening screws 234. The coil support fastening screws 234 not only fix the cylindrical thin-walled sleeve 221, but also support the weight of the entire coil assembly 21 and the coil support 22. Furthermore, the end caps 24 include two large end caps 241 and two small end caps 242, which are used for sealing the ends of the coil support 22 and the water-cooled housing 23, respectively, forming a sealed water storage cavity with a certain volume between the coil support 22 and the water-cooled housing 23. Specifically, circumferential circular sealing grooves are provided on the inner circular surfaces of the large end cover 241 and the small end cover 242, namely, sealing groove 243 between the water-cooling shell and the large end cover, sealing groove 244 between the large end cover and the small end cover, and sealing groove 245 between the small end cover and the coil support. Among them:

[0042] The sealing groove 243 between the water-cooled housing and the large end cover mates with the flanges on the circular surfaces at both ends of the water-cooled housing;

[0043] The sealing groove 244 between the large end cap and the small end cap mates with the flange on the outer circular surface of the large end cap;

[0044] The sealing groove 245 between the small end cap and the coil support matches the flanges on the circular surfaces at both ends of the coil support.

[0045] Custom-made rubber sealing rings are installed at each sealing groove. When the sealing rings are tightened, all three components work together to achieve a water seal in the water storage chamber, ensuring that cooling water will not leak. The tightening of the sealing rings is achieved through the fastening of the threaded connection. See attached diagram. Figure 6The big end cover fastening screw 246 is used to press the sealing ring between the big end cover 241 and the water-cooled shell 23, while the small end cover fastening screw 247 is used to press the sealing ring between the small end cover 242 and the coil support 22 and the sealing ring between the small end cover 241 and the big end cover 242. Meanwhile, these two types of fastening screws also bear the function of fixing the end cover 24. In addition, the flange ring inside the water-cooled shell 23 and the flange of the cylindrical thin-walled sleeve 221 are both provided with a plurality of annular straight grooves, which are aligned with each other to ensure the through of the cooling water on both sides of the water storage cavity.

[0046] In practical application, the water circulation and cooling in the water storage cavity inside the water-cooled coil device 2 are realized by the external water cooler 1. Referring to the attached Figure 4 With the attached Figure 5 The water-cooled shell 23 is provided with a water inlet 232 and a water outlet 231, which are essentially two G1 / 8 threaded holes connected with a 90° right-angle tower joint respectively. The threaded part of the tower joint is provided with a sealing ring, and the water-tightness of the water inlet and outlet is realized by threaded compression. Further, the tower joints at the water inlet 232 and the water outlet 231 are connected with the water inlets and outlets of the water cooler 1 through silicone hoses respectively, thereby forming a continuous water circulation refrigeration circuit of the magnetic field generating device. The water cooler is equipped with a powerful cooling fan and a compressor, which has excellent refrigeration effect and is used to quickly remove the heat generated by the coil conductor.

[0047] In addition, the water-cooled shell 23 is further provided with a wiring port 233, which is essentially an M16x1.5 threaded hole connected with an M16 waterproof cable joint. Similarly, the threaded part of the waterproof cable joint is also provided with a sealing ring, and the water-tightness of the wiring port 233 is realized by threaded compression. Further, the waterproof cable joint is provided with a clamping claw and a sealing sleeve for compressing the cable drawn from the inside of the water-cooled shell 23 to ensure the water-tightness of the cable. The wires of the four circular coils in the coil group 21 are connected in parallel and then connected with the copper core in the cable to reduce the total resistance and increase the input current of the entire water-cooled coil device 2, thereby improving the magnetic field strength generated by the magnetic field generating device.

[0048] The first coil 211, the second coil 212, the third coil 213 and the fourth coil 214 are all wound by fine copper wires with a diameter of 0.64 mm, which are arranged in a compact manner and each turn is orderly. Finally, the number of turns of each coil is about 380 turns. In addition, the copper wire is wrapped with a layer of thick waterproof and anticorrosive insulating paint to ensure that the copper wire can be in stable contact with the cooling water for a long time.

[0049] The control box 3 is used to be connected with the waterproof cable joint connected in the wiring port 233 on the water-cooled shell 23, so as to generate a one-dimensional alternating magnetic field. The control box 3 is powered by 220V alternating current, and generates a controllable sine alternating voltage signal through an internal power conversion component, a control component and a driving component. The control box can output an accurate alternating voltage signal with a continuously adjustable frequency in the range of 0-1000Hz and a continuously adjustable voltage amplitude in the range of 0-48V.

[0050] The component materials of the water-cooled coil device 2 are all aluminum alloy, which will not affect the magnetic field; at the same time, the surface of the aluminum alloy is subjected to anodic oxidation treatment to realize the insulation effect.

[0051] Referring to the accompanying drawings Figure 8 With the accompanying drawings Figure 9 , the application first verifies the uniform magnetic field region range and the magnetic field uniformity of the magnetic field generating device by using the simulation method of COMSOL software. Since the uniform magnetic field region range and the magnetic field uniformity are not affected by the magnetic field working mode, in order to reduce the simulation cost, the simulation analysis is carried out under the steady-state condition of the constant current of the coil group 21. In addition, considering that the water-cooled coil device 2 has the characteristic of central symmetry, only any longitudinal section in the cylindrical magnetic field region S1 needs to be selected for simplified research, so as to obtain the simulation data distribution of the axial magnetic field intensity of the central plane of the water-cooled coil device 2. Specifically, by focusing on the simulation results shown in the accompanying drawings Figure 8 , the axial magnetic field intensity distribution of the 4x8cm plane S2 in the center of the water-cooled coil device 2 is particularly concerned, and the accompanying drawings Figure 9 are obtained accordingly. According to the results shown in the accompanying drawings Figure 9 , the axial magnetic field intensity distribution of the 4x8cm plane in the center of the water-cooled coil device 2 has sufficient uniformity.

[0052] In the embodiment of the application, the cylindrical uniform magnetic field region S1 constructed by the first coil 211, the second coil 212, the third coil 213 and the fourth coil 214 also needs to be further measured, in order to verify the magnetic field stability and the uniformity of the magnetic field region of the magnetic field generating device. The specific steps are as follows:

[0053] 1. Place the water-cooled coil device 2 on the experimental platform, and connect the silica gel hose between the water-cooled coil device 2 and the water-cooled machine 1. Then, connect the cable led out at the wiring port 233 to the control box 3 through a specific interface. At the same time, select a table one-dimensional alternating current gauss meter to measure the magnetic field intensity.

[0054] 2. Fix the probe of the table one-dimensional alternating current gauss meter on a precision bidirectional displacement table to build a high-precision magnetic field measurement platform. Initially, the measurement center of the probe is located at the center point of the water-cooled coil device 2.

[0055] 3. Power on the control box and water chiller, ensuring the control box can output a sinusoidal alternating voltage signal. Since the coil is an inductive element, it generates significant inductive reactance under high-frequency alternating voltage signals, leading to a certain degree of attenuation in the coil current. Therefore, the heat generation of the coil is not significant under high-frequency conditions. Based on this, given the limited voltage output capability, analyzing a low-frequency sinusoidal alternating voltage signal is more effective in verifying the heat dissipation performance of the magnetic field generator. Three sets of sinusoidal alternating voltage input signals are set, each with a frequency of 1Hz and amplitudes of 19.2V, 25.5V, and 38.6V, respectively.

[0056] 4. First, verify the stability of the alternating magnetic field amplitude of the magnetic field generator under a sinusoidal alternating voltage signal input, and obtain the attached... Figure 10 The time-varying characteristic curve is shown. Experimental results show that, during a continuous 1-hour working period, the fluctuation range of the alternating magnetic field amplitude generated by the magnetic field generator does not exceed 0.15 mT, which fully demonstrates the excellent heat dissipation performance of the device.

[0057] 5. Further, verify the magnetic field uniformity of the cylindrical uniform magnetic field region S1 under a sinusoidal alternating voltage signal input. (Refer to Appendix) Figure 8 and attached Figure 9 Based on the simulation results, the 4×8cm plane S2 at the center of the water-cooled coil device 2 was selected as the measurement object. This plane was divided into 200 equally spaced square grids, and the displacement stage was controlled to measure the alternating magnetic field amplitude at each grid point. Finally, the attached... Figure 11 Appendix Figure 12 and attached Figure 13 .

[0058] 6. Define the amplitude of the alternating magnetic field at the center point of the measurement plane as B0, and define the amplitude of the alternating magnetic field at the i-th grid point as B. i Then the magnetic field deviation at the i-th grid point can be expressed as err i =|B i -B0| / B0. The average relative error of magnetic field strength is used as an evaluation index for magnetic field uniformity. The average relative magnetic field deviation can be defined as... In the formula, m is the total number of grid points. The average relative magnetic field uniformity is defined as B. uniform =(1-f min )×100%, B uniformThe greater the magnetic field region uniformity, the better the uniformity. It is calculated that under three different sinusoidal alternating voltage input signals, the magnetic field uniformity of the 4x8 cm plane S2 at the center of the water-cooled coil device 2 is 99.43%, 99.46% and 99.46% respectively. The above results show that under all test conditions, the magnetic field uniformity of the 4x8 cm plane S2 at the center of the water-cooled coil device 2 is maintained at a high level. Accordingly, it can be considered that the magnetic field generating device can form a cylindrical uniform magnetic field region S1 with a diameter of 4 cm and a height of 8 cm at its center.

Claims

1. A water-cooled one-dimensional alternating uniform magnetic field generator, characterized in that: It includes a water chiller (1), a water-cooled coil device (2), and a control box (3); The water-cooled coil device (2) includes a coil assembly (21), a coil support (22), a water-cooled housing (23), and an end cap (24); The coil assembly (21) includes four coils of the same size. The four coils are coaxially arranged and sleeved on the coil support (22). The coil support (22) is coaxially located inside the water-cooled shell (23). Both ends of the coil support (22) and the water-cooled shell (23) are sealed by end caps (24), so that the space between the coil support (22) and the water-cooled shell (23) forms a closed water storage cavity. The water-cooled housing (23) is provided with an outlet (231) and an inlet (232) for connecting with the water chiller (1) to form a cooling water circulation. The water-cooled housing (23) is also provided with a wiring port (233) for installing a waterproof cable connector. The control box (3) is connected to the coil group (21) through the waterproof cable connector to generate a one-dimensional alternating magnetic field.

2. The water-cooled one-dimensional alternating uniform magnetic field generator according to claim 1, characterized in that: The water chiller (1) includes a water pump for controlling the circulation of cooling water, and also includes a compressor and a cooling fan for refrigeration to cool the cooling water.

3. The water-cooled one-dimensional alternating uniform magnetic field generator according to claim 1, characterized in that: The coil support (22) includes a cylindrical thin-walled sleeve (221), on which four coils are installed and fixed, and a flange on the cylindrical thin-walled sleeve (221). The flange is fixedly connected to the flange ring inside the water-cooled shell (23) by the coil support fastening screws (234).

4. The water-cooled one-dimensional alternating uniform magnetic field generator according to claim 3, characterized in that: The flange is located on one side of the middle of the cylindrical thin-walled sleeve (221), and there are two coils on each side of the flange, with each coil arranged at a specific interval.

5. A water-cooled one-dimensional alternating uniform magnetic field generator according to claim 4, characterized in that: The center-to-center distance between two coils located on the same side of the flange flange is 21mm, and the center-to-center distance between two coils located on opposite sides of the flange flange and close to the flange flange is 73mm.

6. The water-cooled one-dimensional alternating uniform magnetic field generator according to claim 3, characterized in that: The cylindrical thin-walled sleeve (221) and the end faces of the water-cooled outer shell (23) are on the same plane. The end cap (24) includes a large end cap (241) and a small end cap (242). The large end cap (241) is fixed to the end face of the water-cooled outer shell (23) by a large end cap fastening screw (246). The small end cap (242) is fixed to the large end cap (241) by a small end cap fastening screw (247). The small end cap (242) and the cylindrical thin-walled sleeve (221) are engaged and sealed together.

7. The water-cooled one-dimensional alternating uniform magnetic field generator according to claim 1, characterized in that: The lower end of the water-cooled outer shell (23) is provided with a base (25) for supporting the water-cooled coil device (2) so that it can be placed flat on the experimental platform.

8. The water-cooled one-dimensional alternating uniform magnetic field generator according to claim 1, characterized in that: All four coils are made of fine copper wire with a diameter of 0.64mm. The copper wire is arranged in a tight manner, and each turn is neat and orderly. Each coil has about 380 turns.

9. A water-cooled one-dimensional alternating uniform magnetic field generator according to claim 1, characterized in that: The wires of the four coils are connected in parallel and then connected to the waterproof cable connector.

10. A water-cooled one-dimensional alternating uniform magnetic field generator according to claim 1, characterized in that: The control box (3) is capable of outputting a precise alternating voltage signal with a frequency continuously adjustable in the range of 0 to 1000 Hz and a voltage continuously adjustable in the range of 0 to 48 V.

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