High insulation nanocrystalline magnetic core strip coating equipment and coating method

Abstract

The present invention proposes a high-insulation nanocrystalline magnetic core strip coating device and a coating method, comprising a workbench, the workbench has a space in the length direction for accommodating a coating device, and the two ends of the workbench in the length direction are respectively provided with a strip receiving device and a strip unloading device, the receiving device and the unloading device are sleeved with strip reels, and a circulating coating device and a drying device are also provided between the receiving device and the unloading device. The strip is led out from the reel on the unloading device, passes through the circulating coating device and the drying device, and is wound on the receiving device again. The reels of the strip on the unloading device and the receiving device are both arranged with the axis in a vertical direction. After the strip is led out, the surface of the strip is always facing the side, that is, the strip runs vertically. The circulating coating device includes an outflow tap, and a receiving hopper is correspondingly provided at the lower part of the outflow tap. The device has the effects of improving the coating effect, improving the insulation effect of the nanocrystalline magnetic core, and effectively reducing the eddy current loss.

Description

Technical Field

[0001] The present invention and the processing technology of nanocrystalline magnetic core strip material are specifically a coating device and a coating method for high-insulation nanocrystalline magnetic core strip material. Background Art

[0002] Nanocrystalline cores are mostly installed between the inverter and the motor to filter out high-frequency noise to protect the inverter and motor bearings. They are widely used in electric vehicle powertrains and charging stations to allow cars to pass EMC tests. Electric vehicle nanocrystalline elliptical cores can be used on the DC side and the AC side. Amorphous and nanocrystalline cores act as new magnetic materials and can be widely used in electric vehicles, solar power generation, wind power generation, large-scale development power supplies, laser power supplies, and aircraft. They are mainly used for transformers, common-mode noise suppressors, filter inductors, and current transformers. Amorphous and nanocrystalline materials are a green, low-carbon, energy-saving, and efficient new material. Compared with traditional ferrites, amorphous and nanocrystalline cores have a magnetic permeability that is more than 5 times higher and a saturation magnetic induction intensity that is 2 times higher. The filtering effect is greatly improved, and the overcurrent capacity is also greatly enhanced. It can adapt to harsh environments with high temperatures.

[0003] Nanocrystalline magnetic cores are mostly designed to be annular structures. The through holes inside the annular structure are used to pass through structures such as wires. Nanocrystalline magnetic cores are structures formed by winding strips and hardening them. Nanocrystalline magnetic core strips have an insulating effect after coating, which reduces eddy current losses. Existing nanocrystalline magnetic core strip coating equipment uses a horizontal coating method, that is, the surface of the strip is in a relative up and down direction, and the effective coating surface is only on one side. The winding process after coating needs to be performed again, which has low processing efficiency, large amounts of coating solution, and high processing costs.

[0004] As the core loss increases with the frequency, the high-frequency trend of electrical equipment has led to higher and higher requirements for magnetic components. The eddy current loss that was previously negligible at low frequencies has become increasingly difficult to tolerate, so the need for interlayer insulation has become increasingly urgent. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a high-insulation nanocrystalline magnetic core strip coating device.

[0006] The technical solution adopted by the present invention to solve the above-mentioned problem is as follows: the workbench includes a space in the length direction of the workbench for accommodating a coating device, and a strip receiving device and a strip unloading device are respectively arranged at both ends in the length direction of the workbench, and a reel of the strip is sleeved on the receiving device and the unloading device, and a circulating coating device and a drying device are also arranged between the receiving device and the unloading device. The strip is led out from the reel on the unloading device, passes through the circulating coating device and the drying device, and is wound on the receiving device again. The reel of the strip on the unloading device and the receiving device is vertically axially centered. The strip is arranged in the direction of the tap, and the surface of the strip is always facing the side after being led out, that is, the strip runs vertically. The circulating coating device includes an outflow tap, and a receiving hopper is correspondingly arranged at the lower part of the outflow tap. The strip passes vertically between the outflow tap and the receiving hopper. The lower part of the receiving hopper is connected to a filter, and a liquid box is arranged at the lower part of the filter. The liquid box is connected to a liquid pump. The outlet connecting pipe of the liquid pump extends upward and is connected to the outflow tap to form a coating solution circulation loop. The strip passes vertically through the lower part of the outflow tap, and the liquid flow flowing out of the outflow tap is released from both sides at the same time. This device is a coating device used in the processing of nanocrystalline magnetic core strips, which has the advantages of improving the coating effect, fast drying and simultaneous winding processing, improving the processing efficiency, improving the coating quality, improving the insulation effect of the nanocrystalline magnetic core, and can effectively reduce the loss of eddy current and improve the electrical efficiency. Compared with the traditional horizontal coating method, it has the advantage of coating on both sides at the same time, which can effectively improve the coating effect.

[0007] Furthermore, the drying device includes a heating tube, a drying rack is arranged above the heating tube, the drying rack is arranged on a workbench, two rows of staggered guide posts are arranged on the drying rack, the strip moves forward in a "Z" shape between the two rows of staggered guide posts, the distance between the two rows of guide posts on the drying rack is smaller than the heating range of the heating tube, and the heating tube adopts an electric heating tube. The heating tube dries the coating of the strip by heating. In order to improve the drying effect, the strip runs in a "Z" shape between the drying racks, prolongs the time spent on the drying rack, optimizes the drying effect, and makes the coating stronger.

[0008] Furthermore, a cover is provided outside the heating tube, the cover surrounds the outer periphery of the heating tube, and a working window is provided at the upper oblique side of one side, and a material receiving box is provided at the bottom of the cover, and the diameter area of ​​the material receiving box is larger than the projected area of ​​the heating tube. The cover insulates part of the heating tube to improve the thermal efficiency of the heat pipe, and the working window is used to observe and adjust the guide column on the drying rack.

[0009] Furthermore, the material discharging device and the material receiving device are both configured as a turntable structure, the rotating shaft of the turntable structure of the material discharging device is configured as a resistance-free shaft structure or a constant resistance shaft structure, an annular magnetic block is provided on the lower side of the turntable of the material receiving device, and the turntable structure of the material receiving device is connected to a driving motor. The resistance-free shaft structure is a conventional bearing structure, and the constant resistance shaft structure can be implemented by sleeve-connecting a damping plastic ring with constant resistance. The magnetic force generated by the annular magnetic block under the turntable of the material receiving device can prevent the strip from being thrown upward when winding, so that the strips can achieve a better fit with each other when winding, and the material receiving device can adjust the speed to control the tension of the winding when receiving the material.

[0010] Furthermore, the outflow faucet is configured as a long curved pipe structure, and a liquid flow adjustment device is provided at the end of the curved pipe structure, and the liquid flow adjustment device includes two support rods arranged perpendicular to each other, the support rod arranged in the vertical direction is connected to the extended part of the drying rack, the support rod arranged in the horizontal direction is connected to the end of the curved pipe structure and is adjustably connected to the support rod in the vertical direction, and two guide columns are also provided on both sides of the receiving hopper. The guide columns on both sides of the receiving hopper can guide the strip to pass through the center above the feed hopper, and align the liquid flow on the strip through the liquid flow adjustment device of the outflow faucet, so that the coating effect is better and more uniform.

[0011] Furthermore, a liquid outlet pipe is inserted at the end of the outlet faucet, and a nozzle notch is provided at the end of the outlet pipe. The notch is located at the end of the outlet pipe and along the central axis and divides the end of the outlet pipe into two symmetrical parts. The diameter of the nozzle notch is larger than the thickness of the strip. The two sides of the nozzle notch are designed with concave and convex and are provided with a plurality of liquid outlet micropores. The concave and convex design of the two sides of the nozzle notch can make the strip coating more uniform, and at the same time can reduce the phenomenon of uneven film coating of the coiled material caused by the blockage of the liquid outlet micropores. The nozzle notch can control the coating thickness caused by the coating, and the outlet pipe can be replaced according to the requirements of the coating. The liquid flow adjustment device can also adjust the depth of the liquid outlet pipe inserted in the end of the outlet faucet.

[0012] Furthermore, two annular guide rings are sleeved on the guide column, and the distance between the two annular guide rings can be adjusted according to the width of the strip passing through.

[0013] Furthermore, an alcohol concentration detector is provided in the liquid box, and the liquid box is connected to an alcohol supply pipe, the alcohol supply pipe is connected to a solenoid valve, and the solenoid valve and the alcohol concentration detector are connected to the control circuit board. The alcohol supply pipe is used to supplement the alcohol content in the insulating coating liquid. The main components of the insulating coating liquid are nano alloy particles and alcohol. The alcohol will reduce the concentration in real time through the alcohol concentration detector during the circulation process. When the concentration decreases, the solenoid valve is controlled to open and the alcohol is supplemented, thereby ensuring the uniformity and thickness of the coating.

[0014] A high-insulation nanocrystalline magnetic core strip coating method, characterized in that:

[0015] First, preheat the heating tube to 80-100°C, start the drive motor to drive the turntable of the unloading device to rotate, and the strip passes through the nozzle gap at a speed of 2-5m / min. The concave and convex sides on both sides of the nozzle gap evenly coat the insulating coating liquid on both sides of the strip, and then enter the cover and be heated by the heating tube for 5-10s, cooled at room temperature for 3-5s, and then wound on the turntable of the unloading device.

[0016] Furthermore, the main components of the insulating coating liquid are 5-10% nano alloy particles and 50-70% alcohol, the nano alloy particles are a mixture of two or more of nano silicon, nano zinc, nano magnesium, and nano aluminum, preferably nano silicon and nano magnesium, the size of the nano alloy particles is 80-150 mesh, preferably the particle size is 100-120 mesh, which is more convenient for the particles to adhere to the surface of the strip, helping to improve the insulation effect.

[0017] Furthermore, the room temperature cooling is arranged between the heating tube and the discharge device, which is more conducive to the volatilization of the alcohol.

[0018] Furthermore, the thickness of the strip is 18 to 25 μm, preferably 20 μm; the difference between the spacing of the nozzle notch and the thickness of the strip is 4 to 5 μm, and when the strip passes through the nozzle notch, both sides of the strip do not contact the two sides of the nozzle notch, ensuring that the thickness of the insulating coating between the strips is less than 5 μm, and at the same time will not affect the optimal magnetic permeability, magnetic induction intensity and low coercive force of the formed strip.

[0019] Furthermore, the amount of the insulating coating liquid sprayed out of the nozzle notch can be controlled by a liquid flow regulating device, which is a prior art and will not be described in detail herein.

[0020] The operating principle of the present invention is: when setting the running mode of the strip, the strip is set vertically and passes through the nozzle gap, and the insulating coating liquid sprayed from the nozzle gap is evenly coated on both sides of the strip; the insulating coating liquid always circulates and can be reused, thereby reducing the consumption of the insulating coating liquid and reducing waste. The strip runs in a "Z" shape on the drying rack to extend the running time and achieve a better coating drying effect.

[0021] Compared with the prior art, the present invention has the following advantages and effects:

[0022] (1) The present invention is a coating device and coating process used in the processing of nanocrystalline magnetic core strips, which has the advantages of improving the coating effect, fast drying and simultaneous strip winding processing, thereby improving the processing efficiency, improving the coating quality and enhancing the insulation effect of the nanocrystalline magnetic core;

[0023] (2) After the process of the present invention is implemented, the eddy current loss is effectively reduced without significantly affecting the hysteresis loss of the magnetic core, so that the overall loss of the magnetic core is significantly reduced, thereby reducing the heat generation of the magnetic device, and further reducing the heat burden of the entire electrical system, effectively improving the product life and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the invention.

[0025] Figure 2 It is a schematic diagram of the structure of a circulating coating device and a drying device.

[0026] Figure 3 This is a curve chart showing the effect of nanocrystalline magnetic core strip coating process on eddy current loss.

[0027] In the figure: 1. workbench, 2. material collecting device, 3. material discharging device, 4. circulating coating device, 5. drying device, 6. outflow tap, 7. receiving hopper, 8. filter, 9. liquid box, 10. heating tube, 11. drying rack, 12. guide column, 13. cover shell, 14. receiving box, 15. driving motor, 16. liquid flow adjustment device. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0029] Reference Figure 1 and Figure 2 .

[0030] Embodiment 1:

[0031] A high-insulation nanocrystalline magnetic core strip coating device in the present embodiment includes a workbench 1, the workbench 1 has space in the length direction for accommodating the coating device, and the two ends of the workbench 1 in the length direction are respectively provided with a strip receiving device 2 and a strip unloading device 3, and the receiving device 2 and the unloading device 3 are sleeved with strip reels, and a circulating coating device 4 and a drying device 5 are also provided between the receiving device 2 and the unloading device 3. The strip is led out from the reel on the unloading device 3, passes through the circulating coating device 4 and the drying device 5, and is wound on the receiving device 2 again. The reels of the strip on the unloading device 3 and the receiving device 2 are both arranged with the axis in the vertical direction. After the strip is led out, the surface of the strip is always facing the side, that is, the strip runs vertically. The circulating coating device 4 includes an outflow faucet 6, and a receiving hopper 7 is correspondingly arranged at the lower part of the outflow faucet 6. The strip passes vertically between the outflow faucet 6 and the receiving hopper 7. The lower part of the receiving hopper 7 is connected to a filter 8. A liquid tank 9 is arranged at the lower part of the filter 8. The liquid tank 9 is connected to a liquid pump. The outlet connecting pipe of the liquid pump extends upward and is connected to the outflow faucet 6 to form a coating solution circulation loop. The strip passes vertically through the lower part of the outflow faucet 6, and the liquid flow out of the outflow faucet 6 is released from both sides at the same time.

[0032] The drying device 5 in this embodiment includes a heating tube 10, and a drying rack 11 is arranged above the heating tube 10. The drying rack 11 is arranged on the workbench 1, and two rows of staggered guide columns 12 are arranged on the drying rack 11. The strip moves forward in a "Z" shape between the two rows of staggered guide columns 12. The distance between the two rows of guide columns 12 on the drying rack 11 is smaller than the heating range of the heating tube 10, and the heating tube 10 adopts an electric heating tube.

[0033] A cover shell 13 is provided outside the heating tube 10 in this embodiment. The cover shell 13 is arranged to surround the periphery of the heating tube 10 and has a working window opened at an oblique upper portion of one side. A material receiving box 14 is provided at the bottom of the cover shell 13. The caliber area of ​​the material receiving box 14 is larger than the projected area of ​​the heating tube 10.

[0034] The material discharging device 3 and the material receiving device 2 in this embodiment are both configured as a turntable structure, the rotating shaft of the turntable structure of the material discharging device 3 is configured as a resistance-free shaft structure or a constant resistance shaft structure, an annular magnetic block is provided on the lower side of the turntable of the material receiving device 2, and the turntable structure of the material receiving device 2 is connected to a driving motor 15.

[0035] The outflow faucet 6 in this embodiment is configured as a long curved pipe structure, and a liquid flow adjustment device 16 is provided at the end of the curved pipe structure. The liquid flow adjustment device 16 includes two support rods arranged perpendicular to each other. The support rod arranged in the vertical direction is connected to the extended part of the drying rack 11, and the support rod arranged in the horizontal direction is connected to the end of the curved pipe structure and is adjustably connected to the support rod in the vertical direction. Two guide columns 12 are also provided on both sides of the receiving hopper 7.

[0036] A liquid outlet pipe is also embedded at the end of the outflow faucet 6 in this embodiment, and a nozzle notch is provided at the end of the liquid outlet pipe. The notch is located at the end of the liquid outlet pipe and along the central axis and divides the end of the liquid outlet pipe into two symmetrical parts. The diameter of the nozzle notch is larger than the thickness of the strip, and the two side surfaces of the nozzle notch are concave-convex and are provided with a plurality of liquid outlet micropores.

[0037] In this embodiment, two annular guide rings are sleeved on the guide column 12, and the distance between the two annular guide rings can be adjusted according to the width of the strip passing through.

[0038] In the present embodiment, an alcohol concentration detector is arranged in the liquid tank 9, and the liquid tank 9 is connected to an alcohol liquid supply pipe, to which an electromagnetic valve is connected, and both the electromagnetic valve and the alcohol concentration detector are connected to a control circuit board.

[0039] Embodiment 2:

[0040] First, preheat the heating tube 10 to 80-100°C, start the drive motor 15 to drive the turntable of the discharge device 3 to rotate, and the strip passes through the nozzle gap at a speed of 2-5m / min. The concave and convex sides on both sides of the nozzle gap evenly coat the insulating coating liquid on both sides of the strip, and then enter the cover 13 and be heated by the heating tube 10 for 5-10s, cool at room temperature for 3-5s, and then be wound on the turntable of the discharge device 3.

[0041] When the strip in this embodiment passes through the nozzle notch, both side surfaces of the strip do not contact with both side surfaces of the nozzle notch.

[0042] The strip in this embodiment can partially pass through the nozzle gap, that is, the upper part of the strip is in the nozzle gap, and the sprayed insulating coating liquid flows from top to bottom due to gravity and is coated on both sides of the strip.

[0043] In this embodiment, the strip can be selected to partially pass through the nozzle gap or completely pass through the nozzle gap according to actual production conditions.

[0044] In this embodiment Figure 3The size of the nanocrystalline magnetic core strip used is OD100mm*ID60mm*H25mm, and the test condition magnetic induction is 0.5T. It can be clearly seen from the two pictures that this coating process has no significant effect on the hysteresis loss of the nanocrystalline magnetic core strip, while effectively reducing the eddy current loss and significantly reducing the overall loss of the magnetic core, thereby reducing the heat generated by the magnetic device and thus reducing the heat burden of the entire electrical system.

[0045] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention, and that the embodiments should be considered exemplary rather than restrictive in any respect, and that the scope of the present invention is defined by the claims rather than the above description, and that all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0046] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A high-insulation nanocrystalline magnetic core strip coating device, comprising a workbench (1), wherein the workbench (1) has a space in the length direction for accommodating a coating device, and wherein: The two ends of the workbench (1) in the length direction are respectively provided with a strip receiving device (2) and a strip unloading device (3). The strip reels are sleeved on the receiving device (2) and the unloading device (3). A circulating coating device (4) and a drying device (5) are also provided between the receiving device (2) and the unloading device (3). The strip is drawn out from the reel on the unloading device (3), passes through the circulating coating device (4) and the drying device (5), and is wound again on the receiving device (2). The strip reels on the unloading device (3) and the receiving device (2) are arranged with their axes in a vertical direction. After the strip is drawn out, the surface of the strip always faces the vertical direction. The side, that is, the strip is running vertically, and the circulating coating device (4) includes an outflow tap (6), and a receiving hopper (7) is correspondingly arranged at the lower part of the outflow tap (6). The strip passes vertically between the outflow tap (6) and the receiving hopper (7), and the lower part of the receiving hopper (7) is connected to a filter (8). A liquid tank (9) is arranged at the lower part of the filter (8), and the liquid tank (9) is connected to a liquid pump. The outlet connecting pipe of the liquid pump extends upward and is connected to the outflow tap (6), forming a coating solution circulation loop, and the strip passes vertically through the lower part of the outflow tap (6), and the liquid flow out of the outflow tap (6) is released from both sides at the same time; The drying device (5) comprises a heating tube (10), a drying rack (11) is arranged above the heating tube (10), the drying rack (11) is arranged on the workbench (1), two rows of staggered guide posts (12) are arranged on the drying rack (11), the strip moves forward in a "Z"-shaped direction between the two rows of staggered guide posts (12), the distance between the two rows of guide posts (12) on the drying rack (11) is smaller than the heating range of the heating tube (10), and the heating tube (10) is an electric heating tube; The material discharge device (3) and the material receiving device (2) are both configured as a turntable structure, the rotating shaft of the turntable structure of the material discharge device (3) is configured as a resistance-free shaft structure or a constant resistance shaft structure, an annular magnetic block is provided on the lower side of the turntable of the material receiving device (2), and the turntable structure of the material receiving device (2) is connected to a drive motor (15); The outflow faucet (6) is configured as a long curved pipe structure, and a liquid flow adjustment device (16) is provided at the end of the curved pipe structure. The liquid flow adjustment device (16) includes two support rods arranged perpendicular to each other, the support rod arranged in the vertical direction is connected to the extended part of the drying rack (11), and the support rod arranged in the horizontal direction is connected to the end of the curved pipe structure and is adjustably connected to the support rod in the vertical direction. Two guide columns (12) are also provided on both sides of the receiving hopper (7).

2. The high insulation nanocrystalline magnetic core strip coating equipment according to claim 1 is characterized in that: A cover shell (13) is arranged outside the heating tube (10), the cover shell (13) is arranged to surround the outer periphery of the heating tube (10), and a working window is opened at an oblique upper side of one side, and a material receiving box (14) is arranged at the bottom of the cover shell (13), and the caliber area of ​​the material receiving box (14) is larger than the projected area of ​​the heating tube (10).

3. The high insulation nanocrystalline magnetic core strip coating equipment according to claim 1 is characterized in that: A liquid outlet pipe is also inserted at the end of the outflow faucet (6), and a nozzle notch is provided at the end of the liquid outlet pipe. The nozzle notch is located at the end of the liquid outlet pipe and is along the central axis and divides the end of the liquid outlet pipe into two symmetrical parts. The diameter of the nozzle notch is larger than the thickness of the strip. The two side surfaces of the nozzle notch are concave-convex and are provided with a plurality of liquid outlet micropores.

4. The high insulation nanocrystalline magnetic core strip coating equipment according to claim 1 is characterized in that: The liquid box (9) is provided with an alcohol concentration detector, and the liquid box (9) is connected to an alcohol liquid supply pipe, to which an electromagnetic valve is connected, and both the electromagnetic valve and the alcohol concentration detector are connected to a control circuit board.

5. A method for coating a high-insulation nanocrystalline magnetic core strip using the high-insulation nanocrystalline magnetic core strip coating device according to any one of claims 2 to 4, characterized in that: First, the heating tube (10) is preheated to 80-100°C, and the driving motor (15) is started to drive the turntable of the unloading device (3) to rotate. The strip passes through the nozzle gap at a speed of 2-5 m / min. The concave and convex sides of the nozzle gap evenly coat the insulating coating liquid on both sides of the strip. The strip then enters the cover (13) and is heated by the heating tube (10) for 5-10 seconds, cooled at room temperature for 3-5 seconds, and then wound on the turntable of the unloading device (3).

6. The high insulation nanocrystalline magnetic core strip coating method according to claim 5, characterized in that: The main components of the insulating coating liquid are 5-10% of nano alloy particles and 50-70% of alcohol. The nano alloy particles are a mixture of two or more of nano silicon, nano zinc, nano magnesium and nano aluminum. The size of the nano alloy particles is 80-150 meshes.

7. The high insulation nanocrystalline magnetic core strip coating method according to claim 5, characterized in that: The normal temperature cooling is arranged between the heating tube (10) and the discharge device (3).

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