Coating device for magnetic powder core

Abstract

The utility model relates to a coating device for a magnetic powder core, which comprises an outer barrel, and a rotating barrel and a hollow atomizing rod which are arranged in the outer barrel, the outer barrel comprises a barrel body and a cover body hermetically connected with the upper end of the barrel body; the bottom of the barrel body is provided with a first through hole for the air guide pipeline to pass through, and the corresponding area of the air guide pipeline is also connected with a first Roots blower; the bottom of the rotating barrel is connected with the rotating assembly, the rotating assembly penetrates through the bottom of the barrel body and is spaced from the bottom of the barrel body by a preset distance in the radial direction, the top of the rotating barrel is arranged in a corresponding circular limiting groove of the cover body, and the width of the circular limiting groove is larger than the barrel wall thickness of the rotating barrel. A heating resistance wire is further distributed on the outer side wall of the rotating barrel; the top end of the hollow atomizing rod is fixedly connected to the inner side of the cover body, and the bottom end of the hollow atomizing rod extends into the rotating barrel; and equidistant atomizing holes are formed in the circumferential direction of the hollow atomizing rod. The utility model aims to simplify the coating process so as to improve the coating effect.

Description

Technical Field

[0001] This utility model relates to the field of insulation coating technology, and in particular to a coating device for magnetic powder cores. Background Technology

[0002] Currently, magnetic powder cores are a type of soft magnetic material made by mixing and pressing metallic ferromagnetic powder with an insulating medium. Due to the small particle size of the magnetic powder and its uniform separation by the insulating medium, the eddy current loss is small, making it suitable for higher frequencies. Because of its high permeability and low loss, this type of material can be used to design and manufacture various high-performance electronic components, such as inductors, filters, and current transformers, and is widely used in fields such as electronic communications and switching power supplies.

[0003] Existing invention patent CN113838658A discloses a method for preparing an iron-silicon magnetic powder core. This invention uses gas-atomized iron-silicon powder, adding spherical iron-silicon powder to a mixture of silicone resin and organic solvent, mixing evenly, and then ultrasonically stirring until dry to obtain an insulating composite magnetic powder. The obtained composite magnetic powder is then added to zinc stearate for high-temperature demolding and pressing to obtain a compact of the iron-silicon magnetic powder core. The compact of the obtained iron-silicon magnetic powder core is then heated under a vacuum of 2–8 × 10⁻⁶. -3 Annealing is performed at 700-800℃ under Pa conditions to obtain iron-silicon magnetic powder cores. This coating process requires ultrasonic stirring and vacuum treatment during annealing. Ultrasonic stirring does not disperse the coating agent effectively, which can easily lead to excessively thick local coating layers of iron-silicon powder, increasing losses and reducing the overall thickness. Furthermore, vacuum heat treatment is costly and not conducive to large-scale mass production. Therefore, there is an urgent need to propose a new coating device to simplify the magnetic powder core coating process. Utility Model Content

[0004] The main purpose of this invention is to propose a coating device for magnetic powder cores, which aims to solve the problem of complex coating processes for magnetic powder cores in the prior art.

[0005] To achieve the above objectives, this utility model provides a coating device for magnetic powder cores, the coating device comprising an outer barrel and a rotating barrel and a hollow atomizing rod disposed inside the outer barrel;

[0006] The outer barrel includes a barrel body and a lid that is sealed to the upper end of the barrel body;

[0007] The bottom of the barrel body is provided with a first through hole for the air guide pipe to pass through, and the corresponding area of ​​the air guide pipe is also connected to a first Roots blower.

[0008] The bottom of the rotating barrel is connected to the rotating assembly, the rotating assembly passes through the bottom of the barrel body and is radially spaced from the bottom of the barrel body by a preset distance, the top of the rotating barrel is set in the corresponding circular limiting groove of the cover, the width of the circular limiting groove is greater than the barrel wall thickness of the rotating barrel, the bottom of the rotating barrel is connected to the inner cavity of the barrel body, and a heating resistance wire is also provided on the outer wall of the rotating barrel.

[0009] The top end of the hollow atomizing rod is fixedly connected to the inside of the cover body, and the bottom end of the hollow atomizing rod extends into the rotating barrel and has a corresponding distance from the inner wall and bottom surface of the rotating barrel.

[0010] The cover is also provided with a second through hole for the exhaust pipe to pass through, a third through hole for the compressed air conduit to pass through, and a fourth through hole for the coating agent conduit to pass through. The second through hole is located in the circular area of ​​the circular limiting groove, and the third and fourth through holes are connected to the hollow atomizing rod.

[0011] The hollow atomizing rod has equidistant atomizing holes in its circumferential direction.

[0012] Optionally, the bottom of the rotating barrel is provided with multiple one-way air valves, and the bottom of the rotating barrel is connected to the inner cavity of the barrel body through the multiple one-way air valves.

[0013] Optionally, a screen is installed inside the exhaust pipe.

[0014] Optionally, a bag filter is also connected to the tail end of the exhaust pipe.

[0015] Optionally, the screen mesh size is 1000 mesh.

[0016] Optionally, a second Roots blower is also connected to a corresponding area of ​​the compressed air duct.

[0017] Optionally, the corresponding area of ​​the exhaust pipe near the screen is also connected to a third Roots blower, which is used to spray high-pressure backflow gas toward the screen to remove the powder adsorbed on the screen.

[0018] Optionally, a corresponding area of ​​the coating agent conduit is also connected to an air compressor, which is used to atomize the coating agent under pressure and allow it to enter the hollow atomizing rod through the coating agent conduit.

[0019] Optionally, each atomizing hole is equipped with a corresponding atomizing nozzle.

[0020] Optionally, the orifice diameter of each one-way vent valve is 1 mm.

[0021] Beneficial effects:

[0022] This invention proposes a coating device for magnetic powder cores. By changing the powder coating method, the powder and coating agent are allowed to fully contact and react, increasing the reaction ratio of iron and silicon powder, thereby improving the coating efficiency of iron and silicon powder. Furthermore, after SEM measurement, the coated iron and silicon powder prepared by this invention exhibits high sphericity and a smooth surface. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of an embodiment of a coating device for magnetic powder cores according to the present invention;

[0025] Figure 2 for Figure 1 A partial structural diagram;

[0026] Figure 3 for Figure 1 A detailed structural diagram of the hollow atomizing rod in the image;

[0027] Figure 4 for Figure 1 A schematic diagram of the rotating drum.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0029] Explanation of icon numbers:

[0030] label name label name 1 Cover 2 Bucket body 3 First Roots Blower 4 Rotating bucket 5 air duct 6 Rotating component 7 One-way air valve 8 Atomizing nozzle 9 Heating resistance wire 10 Hollow atomizing rod 11 Compressed air duct 12 Second Roots Blower 13 air compressor 14 Coating catheter 15 exhaust pipe 16 sieve 17 Third Roots Blower 18 Baghouse dust collector Detailed Implementation

[0031] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0035] See Figure 1-4 , Figure 1 This is a schematic diagram of an embodiment of a coating device for magnetic powder cores according to the present invention. In this embodiment, the coating device includes an outer barrel and a rotating barrel 4 and a hollow atomizing rod 10 disposed inside the outer barrel.

[0036] The outer barrel includes a barrel body 2 and a cover 1 sealed to the upper end of the barrel body 2. The cover 1 can be opened and closed as needed. The bottom of the barrel body 2 has a first through hole for a gas guide pipe 5 to pass through. A first Roots blower 3 is connected to the corresponding area of ​​the gas guide pipe 5, allowing high-pressure air generated by the first Roots blower 3 to enter the outer barrel through the gas guide pipe 5. The pressure of the high-pressure air is 2-3 MPa. The bottom of the rotating barrel 4 is connected to a rotating assembly 6, which passes through the bottom of the barrel body 2 and is radially spaced a predetermined distance from the bottom of the barrel body 2. The top of the rotating barrel 4 is positioned within a corresponding circular limiting groove on the cover 1. The width of the circular limiting groove is greater than the wall thickness of the rotating barrel 4. The bottom of the rotating barrel 4 communicates with the inner cavity of the barrel body 2, allowing high-pressure gas to enter the rotating barrel 4 through the bottom. In actual use, the rotating barrel 4 contains iron-silicon powder. High-pressure gas blows the iron-silicon powder at the bottom, causing most of the powder to float in the rotating barrel 4. Preferably, the bottom of the rotating barrel 4 is provided with multiple one-way vent valves 7, and the bottom of the rotating barrel 4 is connected to the inner cavity of the barrel body 2 through the multiple one-way vent valves 7. The cover 1 is also provided with a second through hole for the exhaust pipe 15 to pass through. The second through hole is located within the circular area of ​​the circular limiting groove, thereby allowing most of the gas inside the rotating barrel 4 to be discharged through the exhaust pipe 15, preventing the gas pressure inside the rotating barrel 4 from exceeding a preset value.

[0037] Furthermore, the top end of the hollow atomizing rod 10 is fixedly connected to the inside of the cover 1, and the bottom end of the hollow atomizing rod 10 extends into the rotating barrel 4 and has a corresponding distance from the inner wall and bottom surface of the rotating barrel 4; the cover 1 is also provided with a third through hole for the compressed air conduit 11 to pass through and a fourth through hole for the coating agent conduit 14 to pass through. The third through hole and the fourth through hole are both connected to the hollow atomizing rod 10, and the hollow atomizing rod 10 has equidistant atomizing holes in the circumferential direction. Each atomizing hole is equipped with a corresponding atomizing nozzle 8, so that the coating agent is mixed evenly and then poured into the coating agent conduit 14. Under the pressure of the air compressor 13, the coating agent is atomized and sprayed out through multiple atomizing nozzles 8. The sprayed atomized droplets enter the rotating barrel 4 and fully contact and react with the iron-silicon powder. An air compressor 13 is installed in a corresponding area of ​​the coating agent conduit 14. The coating agent includes a preset mass of silicone resin, phosphoric acid, and deionized water, thereby enabling the iron-silicon powder to undergo a phosphating reaction with the coating agent. Preferably, the silicone resin is 8g, the phosphoric acid is 4g, and the deionized water is 15g, and the corresponding mass of the iron-silicon powder is 1kg. More preferably, a second Roots blower 12 is also connected to a corresponding area of ​​the compressed air conduit 11.

[0038] Furthermore, in order to accelerate the phosphating reaction and dry the iron-silicon powder, heating resistance wires 9 are also provided on the outer wall of the rotating barrel 4, and excess gas and evaporated droplets during the reaction are discharged through the exhaust pipe 15.

[0039] Furthermore, a screen 16 is installed inside the exhaust pipe 15, and the corresponding area of ​​the exhaust pipe 15 near the screen 16 is also connected to a third Roots blower 17. The third Roots blower 17 is used to spray high-pressure backflow gas toward the screen 16 to remove the powder adsorbed on the screen 16. Preferably, the screen 16 has a mesh size of 1000 mesh, and the third Roots blower 17 generates high-pressure backflow gas every 15 seconds under the control of a timing program.

[0040] Furthermore, the tail end of the exhaust pipe 15 is also connected to a bag filter 18, which is used to collect fine powder particles.

[0041] Furthermore, the orifice diameter of each one-way vent valve 7 is 1 mm.

[0042] Furthermore, to better illustrate the structure of the device in this embodiment, the following detailed explanation will be provided through a specific iron-silicon powder coating process:

[0043] Example 1

[0044] 1 kg of 200-mesh iron-silicon powder (obtained by vacuum atomization) is added to the rotating drum 4. The cover 1 is closed, and the first Roots blower 3 is turned on. High-pressure air enters the drum body 2 through the air guide pipe 5. The high-pressure gas enters the rotating drum 4 through the one-way air valve 7 at the bottom of the rotating drum 4. The high-pressure gas blows the iron-silicon powder at the bottom, suspending it in the rotating drum 4. The coating agent (8 g of silicone resin, 4 g of phosphoric acid, and 15 g of deionized water) is mixed evenly and poured into the coating agent conduit. Under the pressure of the air compressor 13, the coating agent is atomized and sprayed out through the atomizing nozzle 8 of the hollow atomizing rod 10. The sprayed atomized droplets enter the rotating drum 4 and fully contact and react with the iron-silicon powder. After the coating agent is poured in for 15 minutes, the heating resistance wire outside the rotating drum 4 is turned on to heat to 90°C for 45 minutes to accelerate the phosphating reaction and dry the iron-silicon powder. During this period, excess gas and evaporated droplets are discharged into the atmosphere through the exhaust pipe 15, a 1000-mesh screen, and a bag filter 18. After heating and drying, open the cover 1 and take out the iron-silicon powder 1 that has been coated.

[0045] Comparative Example 1

[0046] To highlight the effectiveness of this invention, based on the above embodiments, the hollow atomizing rod 10 and the high-pressure air entering the barrel body 2 through the air guide pipe 5 are omitted. Instead, 1 kg of 200-mesh iron-silicon powder is directly added to the rotating barrel 4. After the coating agent is mixed evenly, it is poured along the barrel wall into the coating cylinder to contact and react with the iron-silicon powder. After the coating agent is poured in for 15 minutes, the heating resistance wire 6 outside the rotating coating cylinder 1 is turned on to heat at 90°C for 45 minutes to accelerate the phosphating reaction and dry the iron-silicon powder. During this process, the evaporated droplets are discharged into the atmosphere through the exhaust pipe 15, a 1000-mesh sieve, and a bag filter 18. After the heating and drying are completed, the cover 1 is opened, and the coated iron-silicon powder 2 is taken out.

[0047] Comparing the prepared coated iron-silicon powders 1 and 2, it can be seen that the particle size distribution of the iron-silicon powders prepared in Example 1 and Comparative Example 1 is not much different, but the uniformity of coating is different. The coated iron-silicon powder 1 prepared in Example 1 has high sphericity and a smooth surface, while the coated iron-silicon powder 2 prepared in Comparative Example 1 is spherical, but some areas of the surface are rugged and uneven.

[0048] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element. The sequence numbers of the above-described embodiments are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0049] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A coating device for a magnetic powder core, characterized by, The coating device includes an outer barrel and a rotating barrel (4) and a hollow atomizing rod (10) disposed inside the outer barrel; The outer barrel includes a barrel body (2) and a cover (1) that is sealed to the upper end of the barrel body (2); The bottom of the barrel body (2) is provided with a first through hole for the air guide pipe (5) to pass through, and the corresponding area of ​​the air guide pipe (5) is also connected to a first Roots blower (3); The bottom of the rotating barrel (4) is connected to the rotating component (6). The rotating component (6) passes through the bottom of the barrel body (2) and is radially spaced from the bottom of the barrel body (2) by a preset distance. The top of the rotating barrel (4) is set in the corresponding circular limiting groove of the cover (1). The width of the circular limiting groove is greater than the barrel wall thickness of the rotating barrel (4). The bottom of the rotating barrel (4) is connected to the inner cavity of the barrel body (2). The outer wall of the rotating barrel (4) is also provided with heating resistance wires (9). The top end of the hollow atomizing rod (10) is fixedly connected to the inside of the cover (1), and the bottom end of the hollow atomizing rod (10) extends into the rotating barrel (4) and has a corresponding distance from the inner wall and bottom surface of the rotating barrel (4). The cover (1) is also provided with a second through hole for the exhaust pipe (15) to pass through, a third through hole for the compressed air conduit (11) to pass through, and a fourth through hole for the coating agent conduit (14) to pass through. The second through hole is located in the circular area of ​​the circular limiting groove. The third through hole and the fourth through hole are both connected to the hollow atomizing rod (10). The hollow atomizing rod (10) has equidistant atomizing holes in the circumferential direction.

2. The coating apparatus for a magnetic powder core according to claim 1, wherein The bottom of the rotating barrel (4) is provided with multiple one-way air valves (7), and the bottom of the rotating barrel (4) is connected to the inner cavity of the barrel body (2) through the multiple one-way air valves (7).

3. The coating apparatus for a magnetic powder core according to claim 2, wherein A screen (16) is installed inside the exhaust pipe (15).

4. The coating apparatus for a magnetic powder core according to claim 1, wherein The exhaust pipe (15) is also connected to a bag filter (18) at its tail end.

5. The coating apparatus for a magnetic powder core according to claim 3, wherein The sieve (16) has a mesh size of 1000.

6. The coating apparatus for a magnetic powder core according to claim 1, wherein The corresponding area of ​​the compressed air duct (11) is also connected to a second Roots blower (12).

7. The coating apparatus for a magnetic powder core according to claim 2, wherein The corresponding area of ​​the exhaust pipe (15) near the screen (16) is also connected to a third Roots blower (17), which is used to spray high-pressure backflow gas toward the screen (16) to remove the powder adsorbed on the screen (16).

8. The coating apparatus for a magnetic powder core according to claim 1, wherein The corresponding area of ​​the coating agent conduit (14) is also connected to an air compressor (13), which is used to atomize the coating agent under pressure and enter the hollow atomizing rod (10) through the coating agent conduit (14).

9. The coating apparatus for a magnetic powder core according to any one of claims 1 to 8, characterized by, Each atomizing hole is equipped with a corresponding atomizing nozzle (8).

10. The coating apparatus for a magnetic powder core according to claim 9, wherein The orifice diameter of each one-way air valve (7) is 1 mm.

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