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

Abstract

The invention 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, water-cooled coil equipment and a control box. The water-cooling coil device comprises a coil assembly, a coil support, a water-cooling shell and an end cover. The coil assembly comprises four coils with the same size, the four coils are coaxially and sequentially arranged on a coil support in a sleeving mode, the coil support is coaxially located in the water-cooling shell, and the two ends of the coil support and the two ends of the water-cooling shell are sealed through end covers, so that the space between the coil support and the water-cooling shell forms a closed water storage cavity; a water outlet and a water inlet are formed in the water-cooling shell and used for being communicated with a water-cooling machine, a wiring port used for installing a waterproof cable connector is further formed in the water-cooling shell, and the control box is communicated with the coil assembly through the waterproof cable connector and used for generating a one-dimensional alternating magnetic field. The coil is cooled through the cooling medium, and the stability of the magnetic field intensity and long-time continuous work are guaranteed.

Description

Technical Field

[0001] The invention 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 Art

[0002] In recent years, researchers have found that alternating magnetic fields have great potential in improving the electrocatalytic properties of nanomaterials, so one-dimensional alternating magnetic field generators are being widely used in research fields such as magneto-electric coupling biomaterials and devices and multi-scale nanomaterial catalysis. However, the traditional magnetic field generator lacks a cooling medium inside, which can easily cause the coil to overheat quickly under high current loads, affecting the stability of the magnetic field strength and making the effective working time of the magnetic field device extremely limited. Summary of the invention

[0003] The purpose of the present invention is to provide a water-cooled one-dimensional alternating uniform magnetic field generating device, which cools the coil by a cooling medium to ensure the stability of the magnetic field intensity and long-term continuous operation.

[0004] The purpose of the present invention is achieved through 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 assembly, a coil support, a water-cooled housing and an end cover;

[0007] The coil group includes four coils of the same size, which are coaxially arranged in sequence and sleeved on a coil bracket, the coil bracket is coaxially located in the water-cooling housing, and both ends of the coil bracket and the water-cooling housing are sealed by end covers, so that the space between the coil bracket and the water-cooling housing constitutes a closed water storage cavity;

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

[0009] The water cooler includes a water pump for controlling the circulation of cooling water, and also includes a compressor and a cooling fan for refrigerating and cooling the cooling water.

[0010] The coil support comprises a cylindrical thin-walled sleeve, four coils are mounted and fixed on the cylindrical thin-walled sleeve, and a flange flange is arranged on the cylindrical thin-walled sleeve, and the flange flange is fixedly connected to the flange ring inside the water-cooled shell through the coil support fastening screws.

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

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

[0013] The cylindrical thin-walled sleeve and the end faces of both ends of the water-cooling 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 to the end face of the water-cooling shell by a large end cover fastening screw, and the small end cover is fixed to the large end cover by a small end cover fastening screw. The small end cover is clamped and sealed with the cylindrical thin-walled sleeve.

[0014] A base is provided at the lower end of the water-cooling housing for supporting the water-cooling coil device so that it can be placed flat on the experimental platform.

[0015] Each of the four coils is wound with thin copper wire with a diameter of 0.64 mm. The copper wire is arranged closely in a compact manner, and each turn is neat and orderly. The number of turns of each coil is about 380.

[0016] The wires of the four coils are connected in parallel and then connected to the waterproof cable connector.

[0017] The control box can output a precise alternating voltage signal with a frequency that is continuously adjustable within the range of 0 to 1000 Hz and a voltage that is continuously adjustable within the range of 0 to 48 V.

[0018] Beneficial effects of this application:

[0019] 1. The present invention adopts water cooling technology, and forms a continuous water circulation refrigeration loop through the water storage cavity, water inlet and outlet pipes and water cooler in the water-cooled coil equipment, and uses the flow of water and compressor refrigeration to quickly take away the heat generated by the coil conductor, thereby effectively reducing the coil temperature, improving the overall heat dissipation performance of the device, ensuring the long-term stability of the magnetic field generated by the magnetic field generating device, and at the same time reducing thermal stress and increasing the service life of the coil.

[0020] 2. The present invention uses four coaxial circular coils of equal size and arranged at 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 area is effectively improved. In addition, the design also significantly enhances the consistency and stability of the magnetic field in the uniform magnetic field area.

[0021] 3. The present invention uses a threaded connection to compress the sealing ring to achieve water sealing treatment of the water storage chamber inside the water-cooling coil equipment. Compared with traditional water-cooling coil equipment, it has a simple structure, low cost and easy maintenance, and effectively prevents leakage of cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 It is a three-dimensional structural schematic diagram of a coil group and a coil support of a water-cooled coil device in a magnetic field generating device of the present invention;

[0024] Figure 3 It is an overall front view of the water-cooling coil device in the magnetic field generating device of the present invention;

[0025] Figure 4 It is an overall left view of the water-cooling coil device in the magnetic field generating device of the present invention;

[0026] Figure 5 It is an overall right side view of the water cooling coil device in the magnetic field generating device of the present invention;

[0027] Figure 6 It is a cross-sectional view of the water-cooling coil device along AA in the magnetic field generating device of the present invention;

[0028] Figure 7 A schematic diagram of the uniform magnetic field region structure formed by the magnetic field generating device of the present invention;

[0029] Figure 8 It is a three-dimensional schematic diagram of the simulation data distribution of the axial magnetic field strength of the center plane of the water-cooling coil device in the magnetic field generating device of the present invention;

[0030] Fig. 9 It is a simulated data distribution cloud diagram of the axial magnetic field strength in a 4×8 cm plane at the center of the water-cooled coil device in the magnetic field generating device of the present invention;

[0031] Fig.10 It is a schematic diagram of the time-varying characteristic curve test of the axial alternating magnetic field amplitude at the center point of the water-cooling coil device in the magnetic field generating device of the present invention;

[0032] Figures 11 to 13 Schematic diagram of the spatial distribution test results of the axial alternating magnetic field amplitude in the 4×8 cm plane at the center of the water-cooled coil device in the magnetic field generating device of the present invention.

[0033] In the figure:

[0034] 1 Water-cooling machine; 2 Water-cooling coil equipment; 21 Coil group; 211 First coil; 212 Second coil; 213 Third coil; 214 Fourth coil; 22 Coil bracket; 221 Cylindrical thin-walled sleeve; 222 Fixing ring; 223 Fixing ring fastening screw; 224 Retaining ring; 23 Water-cooling shell; 231 Water outlet; 232 Water inlet; 233 Wiring port; 234 Coil bracket fastening screw; 24 End cover; 241 Large end cover; 242 Small end cover; 243 Sealing groove between water-cooling 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 bracket; 246 Fastening screw of large end cover; 247 Fastening screw of small end cover; 25 Base; 251 Support block; 252 Square chassis; 3 Control box; S1 Cylindrical uniform magnetic field area; S2 Center 4×8cm plane. DETAILED DESCRIPTION

[0035] like Figure 1-13 As shown, a water-cooled one-dimensional alternating uniform magnetic field generating device is described in detail:

[0036] Refer to the attached Figure 1 The water-cooled one-dimensional alternating uniform magnetic field generating device comprises: a water-cooling machine 1, a water-cooling coil device 2 and a control box 3;

[0037] Refer to the attached Figure 1 To Attachment Figure 6 The water-cooled coil device 2 can be further divided into: a coil group 21, a coil support 22, a water-cooled shell 23, an end cover 24 and a base 25.

[0038] The base 25 includes a support block 251 and a square bottom plate 252, and is used to support the entire water-cooled coil device 2 so that it can be placed flat on the experimental platform.

[0039] Refer to the attached Figure 2 The coil assembly 21 includes four circular coils, namely, a first coil 211, a second coil 212, a third coil 213 and a fourth coil 214. The four coils are respectively mounted on both sides of the flange of the cylindrical thin-walled sleeve 221. Figure 2 From the perspective of , 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 matching relationship 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 inner shoulder of the cylindrical thin-walled sleeve 221 and the retaining ring 224, and are fixed by the outermost fixing ring 222. The fixing ring is provided with a plurality of straight slots in the circumference, which are locked by the fixing ring fastening screws 223 and the circumferential threaded openings of the cylindrical thin-walled sleeve 221.

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

[0041] See attached Figure 3 To Attachment Figure 6 , the coil bracket 22 is installed inside the water-cooling shell 23, and the two end circular surfaces of the coil bracket 22 and the water-cooling shell 23 are flush with each other. Specifically, a plurality of through holes are provided on the flange flange of the cylindrical thin-walled sleeve 221 in the coil bracket 22, which is locked with a plurality of threaded openings on the internal flange ring of the water-cooling shell 23 through the coil bracket fastening screws 234. The coil bracket fastening screws 234 not only play the role of fixing the cylindrical thin-walled sleeve 221, but also bear the function of supporting the weight of the entire coil assembly 21 and the coil bracket 22. Furthermore, the end cover 24 includes two large end covers 241 and two small end covers 242, which are respectively used for sealing connection between the two ends of the coil bracket 22 and the water-cooling shell 23, and form a closed water storage cavity with a certain volume between the coil bracket 22 and the water-cooling shell 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, which are respectively the sealing groove 243 between the water-cooling housing and the large end cover, the sealing groove 244 between the large end cover and the small end cover, and the sealing groove 245 between the small end cover and the coil support.

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

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

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

[0045] Customized rubber sealing rings are installed at each sealing groove. When the sealing rings are pressed tightly, the three together realize the water sealing treatment of the water storage chamber to ensure that the cooling water will not leak. The tightening of the sealing rings is achieved by the tightening effect of the threaded connection. Figure 6The large end cover fastening screw 246 is used to compress the sealing ring between the large end cover 241 and the water-cooling housing 23, while the small end cover fastening screw 247 is used to compress 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 large end cover 242. At the same time, these two types of fastening screws also have the function of fixing the end cover 24. In addition, a plurality of annular straight notches are provided on the flange ring inside the water-cooling housing 23 and the flange flange of the cylindrical thin-walled sleeve 221, and these annular straight notches are aligned with each other to ensure the cooling water on both sides of the water storage chamber passes through.

[0046] In practical applications, the water circulation and cooling in the water storage chamber of the water-cooled coil device 2 is achieved by an external water cooler 1. Figure 4 With attached Figure 5 The water-cooled housing 23 is provided with a water inlet 232 and a water outlet 231, which are essentially two G1 / 8 threaded through holes, each connected to a 90° right-angle pagoda joint. The pagoda joint has a sealing ring at the thread, and the water seal of the water inlet and outlet is achieved by tightening the pipe thread. Furthermore, the pagoda joints at the water inlet 232 and the water outlet 231 are respectively connected to the water inlet and the water outlet on the water cooler 1 through a silicone hose, 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 an excellent cooling effect and is used to quickly take away the heat generated by the coil conductor.

[0047] In addition, a wiring port 233 is provided on the water-cooled housing 23, which is essentially a M16×1.5 threaded through hole connected to an M16 waterproof cable connector. Similarly, the thread of the waterproof cable connector is also provided with a sealing ring, and the water seal at the wiring port 233 is achieved through the threaded tightening action. Furthermore, the waterproof cable connector is provided with a clamping claw and a sealing sleeve, which are used to compress the cable led out from the inside of the water-cooled housing 23 to ensure the water sealing effect of the cable. The conductors of the four circular coils in the coil group 21 are connected in parallel and then connected to the copper core in the cable to reduce the total resistance, increase the input current of the entire water-cooled coil device 2, and thus improve 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 with thin copper wires with a diameter of 0.64 mm. The copper wires are tightly arranged in a compact manner, and each turn is neat and orderly. Finally, the number of turns of each coil is about 380 turns. In addition, the copper wires are wrapped with a thick layer of waterproof and anti-corrosion insulating paint to ensure that the copper wires can be in stable contact with the cooling water for a long time.

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

[0050] The components of the water-cooling coil device 2 are all made of aluminum alloy, which will not affect the magnetic field; at the same time, the surface of the aluminum alloy is anodized to achieve an insulating effect.

[0051] Refer to the attached Figure 8 With attached Fig. 9 , this application first uses the simulation method of COMSOL software to verify the uniform magnetic field area range and magnetic field uniformity of the magnetic field generating device. In view of the fact that the uniform magnetic field area range and magnetic field uniformity are not affected by the magnetic field working mode, in order to reduce the simulation cost, the coil group 21 is selected for simulation analysis under steady-state conditions of constant current. In addition, considering that the water-cooled coil device 2 has the characteristic of central symmetry, it is only necessary to select any longitudinal section within the cylindrical magnetic field area S1 for simplified research, so as to obtain the simulation data distribution of the axial magnetic field strength of the central plane of the water-cooled coil device 2. Specifically, by focusing on the attached Figure 8 The simulation results shown in the figure pay special attention to the axial magnetic field intensity distribution in the 4×8cm plane S2 at the center of the water-cooled coil device 2, and the following Fig. 9 According to the attached Fig. 9 The results show that the axial magnetic field intensity distribution in the 4×8 cm plane at the center of the water-cooled coil device 2 has sufficient uniformity.

[0052] In the embodiment of the present application, it is necessary to further measure 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 to verify the magnetic field stability of the magnetic field generating device and the uniformity of the magnetic field region, which is specifically divided into the following steps:

[0053] 1. Place the water-cooled coil device 2 flat on the experimental platform and connect the silicone hose between it and the water cooler 1. Then, connect the cable from the wiring port 233 to the control box 3 through a specific interface. At the same time, a desktop one-dimensional AC and DC Gauss meter is used to measure the magnetic field strength.

[0054] 2. Fix the probe of the desktop one-dimensional AC / DC Gaussmeter on a precision bidirectional translation stage 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 the water cooler, and ensure that the control box can output a sinusoidal alternating voltage signal. Since the coil is an inductive element, it will produce a large inductive reactance under a high-frequency alternating voltage signal, causing the coil current to attenuate to a certain extent. Therefore, the heat generation of the coil under high-frequency conditions is not significant. Based on this, under limited voltage output capacity, a low-frequency sinusoidal alternating voltage signal is selected for analysis, which can more effectively verify the heat dissipation performance of the magnetic field generating device. Three groups 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 generating device under the input of sinusoidal alternating voltage signal, and obtain the attached Fig.10 The experimental results show that within one hour of continuous working time, the fluctuation range of the alternating magnetic field amplitude generated by the magnetic field generating device does not exceed 0.15mT, which fully proves 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 the input of the sinusoidal alternating voltage signal of the magnetic field generating device. Figure 8 and attached Fig. 9 The simulation results show that the 4×8cm plane S2 in the center of the water-cooled coil device 2 is selected as the measurement object. The plane is divided into 200 square grids with equal spacing, and the translation stage is controlled to measure the alternating magnetic field amplitude at each grid point point by point, and finally the attached Fig.11 , Attachment Fig.12 and attached Fig.13 .

[0058] 6. Define the alternating magnetic field amplitude at the center point of the measurement plane as B0, and the alternating magnetic field amplitude at the i-th grid point as B i , then the magnetic field deviation of the i-th grid point can be expressed as err i =|B i -B0| / B0. The average relative error of magnetic field intensity is used as the evaluation index of magnetic field uniformity. The average relative magnetic field deviation can be defined as Where 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 larger the value, the higher the uniformity of the magnetic field area and the better the uniformity. According to calculations, under three different sets of sinusoidal alternating voltage input signals, the magnetic field uniformity of the 4×8cm plane S2 at the center of the water-cooled coil device 2 was 99.43%, 99.46% and 99.46% respectively. The above results show that under all test conditions, the magnetic field uniformity of the 4×8cm plane S2 at the center of the water-cooled coil device 2 remained at a high level. Based on this, it can be considered that the magnetic field generating device can form a cylindrical uniform magnetic field area S1 with a diameter of 4cm and a height of 8cm at its center.

Claims

1. A water-cooled one-dimensional alternating uniform magnetic field generating device, characterized in that: It comprises a water cooler (1), a water cooling coil device (2) and a control box (3); The water-cooling coil device (2) comprises a coil group (21), a coil support (22), a water-cooling housing (23) and an end cover (24); The coil group (21) includes four coils of the same size, the four coils are coaxially arranged in sequence and sleeved on a coil support (22), the coil support (22) is coaxially located in a water-cooling housing (23), and both ends of the coil support (22) and the water-cooling housing (23) are sealed by end covers (24), so that the space between the coil support (22) and the water-cooling housing (23) forms a closed water storage chamber; The water-cooling housing (23) is provided with a water outlet (231) and a water inlet (232) for communicating with the water cooler (1) to form a cooling water circulation. The water-cooling 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) via the waterproof cable connector to generate a one-dimensional alternating magnetic field.

2. A water-cooled one-dimensional alternating uniform magnetic field generating device according to claim 1, characterized in that: The water cooler (1) comprises a water pump for controlling the circulation of cooling water, and also comprises a compressor and a cooling fan for refrigerating and lowering the temperature of the cooling water.

3. A water-cooled one-dimensional alternating uniform magnetic field generating device according to claim 1, characterized in that: The coil support (22) comprises a cylindrical thin-walled sleeve (221), four coils are mounted and fixed on the cylindrical thin-walled sleeve (221), and a flange flange is arranged on the cylindrical thin-walled sleeve (221), and the flange flange is fixedly connected to the flange ring inside the water-cooling shell (23) through the coil support fastening screws (234).

4. A water-cooled one-dimensional alternating uniform magnetic field generating device according to claim 3, characterized in that: The flange is located at a position slightly to one side of the middle of the cylindrical thin-walled sleeve (221), and two coils are respectively arranged on both sides of the flange, and the coils are arranged at a specific interval.

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

6. A water-cooled one-dimensional alternating uniform magnetic field generating device according to claim 3, characterized in that: The cylindrical thin-walled sleeve (221) and the end faces of the water-cooling housing (23) are both in the same plane. The end cover (24) comprises a large end cover (241) and a small end cover (242). The large end cover (241) is fixed to the end face of the water-cooling housing (23) by means of a large end cover fastening screw (246). The small end cover (242) is fixed to the large end cover (241) by means of a small end cover fastening screw (247). The small end cover (242) is snap-fitted and sealed with the cylindrical thin-walled sleeve (221).

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

8. The water-cooled one-dimensional alternating uniform magnetic field generating device according to claim 1, characterized in that: The four coils are all wound with thin copper wires with a diameter of 0.64 mm. The copper wires are arranged closely in a compact manner, and each turn is neat and orderly. The number of turns of each coil is about 380.

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

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