A fan shaft current suppression device based on an insect multi-legged self-cleaning bionic structure

Abstract

The present invention relates to the technical fields of wind power and mechanical structures, and specifically discloses a device for suppressing shaft current of a wind turbine based on an insect multi-legged self-cleaning bionic structure, which includes a conductive brush, a brush ring, a flange sleeve, a scraping ring and a housing. A plurality of air outlet channels are provided in the flange sleeve, and an air delivery pipe communicated with the air outlet channels is connected to the middle of the flange sleeve. An air inlet channel is provided on the housing. The shaft voltage is grounded before the shaft current forms a path through the motor bearing of the wind turbine generator through the loop formed by the motor rotating shaft, the conductive brush, the brush ring, the housing, the motor end cover and the motor housing. The air entering through the air inlet channel, the air delivery pipe and the air outlet channels drives the scraping ring to rotate and clean dust. The device has a simple structure, a long wear life and a stable contact resistance, can achieve circumferential contact grounding, has a good grounding effect, can effectively suppress the generation of shaft current, improve the blocking performance, ensure the stable operation of the motor, and reduce the equipment maintenance cost.

Description

Technical Field

[0001] The present invention relates to the technical fields of wind power and mechanical structures, and particularly provides a fan shaft current suppression device based on an insect multi-legged self-cleaning bionic structure. Background Art

[0002] In the variable frequency drive system of a doubly-fed induction wind generator, the common mode voltage of the frequency converter will induce a shaft voltage through the low-impedance path formed by the stray capacitance of the motor, and then generate a shaft current, which will cause early bearing failure. The shaft current will cause surface damage and increased friction of the bearing, thereby increasing the maintenance cost and reducing the operating reliability of the wind turbine unit. The long-term electro-corrosion effect of the shaft current will cause the bearing to fail quickly, trigger the shutdown of the unit, and affect the availability and power generation revenue of the unit.

[0003] Currently, one of the solutions to shaft current is the brush solution. The following documents in the prior art relate to the shaft current brush solution:

[0004] 1. A patent document with the publication number "CN222483932U" and the name "Shaft current conducting brush device and motor". The shaft current brush device includes: a ring body, a plurality of mounting grooves arranged circumferentially, a first opening, a plurality of static charge removal components, etc. The conductive fibers of the static charge removal components extend radially towards the area surrounded by the ring body, and a part of the conductive fibers extends into the area surrounded by the ring body. This patent document has high production efficiency and simple manufacturing process.

[0005] 2. A patent document with the publication number "CN113949221B" and the name "Conductive brush for a conductive device of a motor shaft current protection structure", including a fixed seat, a pressing plate, conductive fibers, a fixing plate, a star-shaped column, a pressing column, a shaping hole, a fixing pressing plate, an assembly hole. The length of the pressing column is greater than the length of the star-shaped column. The middle of the conductive fiber is located in the star-shaped groove, and both ends of the conductive fiber extend out of the star-shaped groove. The structure in this patent document has high strength, the conductive fibers are firmly fixed, and the working performance is stable.

[0006] The shaft current brush solutions in the above prior art have the following problems and current solutions:

[0007] 1. Poor contact problem. Poor contact may lead to an increase in resistance, thereby reducing the power transmission efficiency, and even causing sparks and arcs, which will further damage the motor.

[0008] Regarding the problem of poor contact, current solutions include regular inspections, maintenance, and improvement of the materials (such as using high-conductivity and high-wear-resistant composite materials) and structures of the carbon brushes. Regular inspections and maintenance consume a large amount of manpower and material resources. High-conductivity materials help ensure a high contact conductivity between the carbon brush and the motor shaft. Specific processes and designs are required. Good contact between the carbon brush and the motor shaft can ensure the conductivity effect, and a well-designed carbon brush structure is needed.

[0009] 2. The problem of carbon powder accumulation and inability to self-clean. The accumulation of carbon powder may increase the resistance between motor components, resulting in more heat generation when current passes through, further exacerbating the overheating problem of the motor.

[0010] Regarding the problem of carbon powder accumulation, current solutions include regular cleaning and installing a carbon brush dust collector on the motor. Regular cleaning consumes a large amount of time, manpower, and material resources. The carbon brush dust collector can remove carbon powder inside the motor in real time to avoid its accumulation. However, it cannot eliminate the carbon powder accumulation in devices outside the motor housing.

[0011] In summary, to solve the problems of poor contact and inability to self-clean in the shaft current carbon brush solution, there is an urgent need to develop a new type of fan shaft current suppression device. Summary of the Invention

[0012] To solve the above problems, the present invention provides a fan shaft current suppression device based on the multi-legged self-cleaning bionic structure of insects, which can ensure that the suppression effect of the overall device on shaft current is not affected, can ensure that the device maintains good cleanliness during operation, and can solve the problem that carbon powder deposition may cause the surface of the carbon brush filaments to become uneven.

[0013] A fan shaft current suppression device based on the multi-legged self-cleaning bionic structure of insects provided by the present invention is installed on a fan generator. The fan generator includes a motor housing and a motor end cover provided at the end of the motor housing. The motor housing includes a motor shaft. The fan shaft current suppression device includes a connection component, a conductive brush component, and a bionic self-cleaning component;

[0014] The conductive brush component includes a brush ring and conductive brushes. The conductive brushes include inner brushes and outer brushes in a stepped shape. The outer brushes are in contact with the motor shaft. A plurality of first pressing blocks are provided at the inner end of the brush ring, and second pressing blocks are provided on the outer sides of the first pressing blocks. The bionic self-cleaning component includes a flange sleeve located at the lower end of the conductive brushes. The conductive brushes are pressed between the brush ring and the flange sleeve by the first pressing blocks and the second pressing blocks;

[0015] A plurality of air outlet channels are circumferentially formed in the flange sleeve with the center of the middle part of the flange sleeve as the center. The air outlet end of the air outlet channel is a scraping ring bin with a circular structure, and a scraping ring is arranged in the scraping ring bin in an offset manner; the outer brush is located outside the flange sleeve and below the scraping ring bin. The inner brush and the outer brush are connected by a connecting brush. An air outlet is formed in the connecting brush corresponding to the scraping ring bin. The inner brush, the connecting brush, and the outer brush are of an integral structure;

[0016] A gas pipeline connected to the air outlet channel is connected to the middle part of the flange sleeve; the connecting component includes a housing and a pressing piece located inside the housing. The brush ring is pressed between the pressing pieces. The flange sleeve is located on the inner side of the pressing piece. One side of the brush ring far from the flange sleeve is connected to the housing; a plurality of air inlet channels are formed in the housing, and the gas pipeline is connected to the air inlet channels;

[0017] The loop formed by the motor rotating shaft, the conductive brush, the brush ring, the housing, the motor end cover, and the motor housing grounds the shaft current before the voltage forms a path through the motor bearing of the fan generator; the air entering through the air inlet channel, the gas pipeline, and the air outlet channel drives the scraping ring to rotate and clean the dust.

[0018] Further, a guiding groove is formed between adjacent first pressing blocks, and a guiding post located on the flange sleeve is arranged in the guiding groove. Adjacent second pressing blocks are located on both sides of the guiding post.

[0019] Further, the part of the air outlet channel inside the scraping ring bin is a reduced-diameter ventilation bin that gradually reduces in diameter from outside to inside. The inner end of the ventilation bin includes an engaging groove; engaging teeth are provided on the outer end face of the gas pipeline corresponding to the engaging groove; the air outlet channel in the flange sleeve and the gas pipeline are meshed and connected and communicated through the engaging teeth and the engaging groove.

[0020] Further, the flange sleeve includes a plurality of limiting platforms circumferentially arranged on the outer end face. The outer brush of each conductive brush, each scraping ring bin, and each scraping ring are respectively located between adjacent limiting platforms; the limiting platform is arranged in a matching manner with the guiding post, and the matching limiting platform and guiding post are on the same plane.

[0021] Further, both the inner brush and the outer brush are in a fan-shaped brush structure; the outer brush extends towards the side away from the flange sleeve to the outside of the limiting platform and contacts the motor rotating shaft; both the first pressing block and the second pressing block are in a fan-shaped structure and jointly press on the upper end of the inner brush.

[0022] Further, pin holes are formed in a matching manner on the upper end face and the lower end face of the flange sleeve in the middle of the scraping ring. The scraping ring is rotatably connected in the pin holes through connecting pins; the air introduced into the scraping ring bin through the air inlet channel, the gas pipeline, and the ventilation bin drives the scraping ring to rotate counterclockwise to clean the dust formed by the contact between the outer brush and the motor rotating shaft; the inner brush is jointly pressed on the upper end face of the flange sleeve by the first pressing block and the second pressing block.

[0023] Furthermore, a clamping seat and an annular cover are provided on the shell, a plurality of clamping blocks are connected to the outer end surface of the brush ring, one end of the clamping block close to the shell is placed on the clamping seat, and the clamping block is clamped on the clamping seat by the annular cover.

[0024] Furthermore, the pressing plate includes an upper pressing plate and a lower pressing plate, both of which are provided with clamping blocks, and the brush ring is pressed between the upper pressing plate and the lower pressing plate; the clamping seat includes an upper clamping platform and a lower clamping platform, the clamping block on the upper pressing plate is placed on the upper clamping platform, and the clamping block on the lower pressing plate is placed on the lower clamping platform; the annular cover includes an upper annular cover and a lower annular cover, the clamping block on the upper pressing plate is pressed between the upper clamping platform and the upper annular cover, the clamping block on the lower pressing plate is pressed between the lower clamping platform and the lower annular cover, the lower annular cover and the outer shell are an integrated structure, and the upper annular cover and the outer shell are a split structure.

[0025] Furthermore, the upper pressing plate and the lower pressing plate include a plurality of groups of matching clamping blocks, and the brush rings and the groups of matching clamping blocks are staggered.

[0026] Furthermore, a connection disk is provided on the outer peripheral surface of the shell, and a plurality of connection holes are provided in the connection disk to match the motor end cover, and the fan shaft current suppression device is connected to the motor end cover through the connection disk.

[0027] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0028] The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure in this scheme is installed on the outside of the motor end cover of the motor, and includes a brush structure imitating the toes of the swimming feet of a multi-legged insect. The brush structure imitating the toes of the swimming feet of a multi-legged insect can achieve annular contact around the motor shaft to ensure stable contact resistance. Even if a part of the brush has poor contact, the remaining parts can still maintain stable contact, which can ensure that the overall device has an unaffected suppression effect on the shaft current. At the same time, the design of the contact between the side of the brush and the motor shaft can make the contact more uniform and avoid excessive wear caused by direct contact between the top of the brush and the motor shaft, thereby extending the wear life of the entire device.

[0029] This solution also includes a self-cleaning component that imitates the self-cleaning mechanism of multi-legged insects. The self-cleaning component can independently solve the problem of carbon powder accumulation in the device, ensuring that the device maintains a good degree of cleanliness during operation. At the same time, it solves the problem that the surface of the carbon brush wire may no longer be smooth due to carbon powder deposition, helping the device to extend its wear life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the assembly structure of a wind turbine generator and a wind turbine shaft current suppression device provided according to an embodiment of the present invention;

[0031] Figure 2It is a schematic diagram of the overall structure of the fan shaft current suppression device provided according to an embodiment of the present invention Figure 1 ;

[0032] Figure 3 It is a schematic diagram of the partial structure of the fan shaft current suppression device provided according to an embodiment of the present invention Figure 1 (The connection plate and the upper annular cover are not shown);

[0033] Figure 4 It is a schematic diagram of the partial structure of the fan shaft current suppression device provided according to an embodiment of the present invention Figure 2 (The connection plate and the upper pressing piece are not shown);

[0034] Figure 5 It is a schematic diagram of the overall structure of the fan shaft current suppression device provided according to an embodiment of the present invention Figure 2 ;

[0035] Figure 6 It is a schematic diagram of the partial structure of the fan shaft current suppression device provided according to an embodiment of the present invention Figure 3 (The housing, the connection plate, and the lower annular cover are not shown);

[0036] Figure 7 It is a schematic diagram of the structure of the flange sleeve and the conductive brush assembly in the fan shaft current suppression device provided according to an embodiment of the present invention Figure 1 ;

[0037] Figure 8 It is a schematic diagram of the structure of the flange sleeve and the conductive brush assembly in the fan shaft current suppression device provided according to an embodiment of the present invention Figure 2 (The conductive brush is not shown);

[0038] Figure 9 It is a schematic diagram of the structure of the flange sleeve and the guide post in the fan shaft current suppression device provided according to an embodiment of the present invention;

[0039] Figure 10 It is a schematic diagram of the partial structure of the brush ring in the fan shaft current suppression device provided according to an embodiment of the present invention;

[0040] Figure 11 It is a schematic diagram of the structure of the conductive brush and the air outlet channel in the fan shaft current suppression device provided according to an embodiment of the present invention (only one conductive brush is shown, and the shown conductive brush is in the state before being flattened and pressed tightly by the first pressing block and the second pressing block).

[0041] The reference numerals therein include: motor housing 1, motor end cover 2, motor rotating shaft 3, connecting disc 4, connecting hole 5, brush ring 6, conductive brush 7, inner brush 8, outer brush 9, connecting brush 10, first pressing block 11, second pressing block 12, flange sleeve 13, air outlet channel 14, scraping ring bin 15, scraping ring 16, air delivery pipe 17, outer housing 18, upper pressing piece 19, lower pressing piece 20, air inlet channel 21, guiding groove 22, guiding post 23, ventilation bin 24, meshing groove 25, meshing teeth 26, limiting platform 27, pin hole 28, clamping block 29, upper pressing platform 30, lower pressing platform 31, upper annular cover 32, lower annular cover 33, pressing seat 34. Detailed implementation manners

[0042] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further describes the present invention in detail in conjunction with the appended Figure 1-11 drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention.

[0043] A fan shaft current suppression device based on an insect multi-legged self-cleaning bionic structure, as Figure 1 shown, is installed on a fan generator. The fan generator includes a motor housing 1 and a motor end cover 2 provided at the end of the motor housing 1. The motor housing 1 includes a motor rotating shaft 3, a rotor and a slip ring. The whole fan shaft current suppression device is as Figure 1 shown at A in the figure, and the fan shaft current suppression device is installed on the motor end cover 2.

[0044] The fan shaft current suppression device includes a connection assembly, a conductive brush assembly and a bionic self-cleaning assembly. The connection assembly connects the fan shaft current suppression device to the motor end cover 2. Specifically, as Figure 1 、 Figure 2 shown, the connection assembly includes an outer housing 18. A connecting disc 4 is provided on the outer peripheral surface of the outer housing 18. The connecting disc 4 and the motor end cover 2 are provided with a plurality of connecting holes 5 in a matching manner. The fan shaft current suppression device is connected to the motor end cover 2 through the connecting disc 4.

[0045] The conductive brush assembly includes a brush ring 6 and a conductive brush 7. The conductive brush 7 includes Figure 11 the stepped inner brush 8 and outer brush 9 as shown in the figure. The outer brush 9 contacts the motor rotating shaft 3. A plurality of first pressing blocks 11 are provided at the inner end of the brush ring 6. A second pressing block 12 is provided outside the first pressing block 11. A guiding groove 22 is formed between adjacent first pressing blocks 11. A guiding post 23 located on the flange sleeve 13 is provided in the guiding groove 22. Adjacent second pressing blocks 12 are located on both sides of the guiding post 23. The gaps between adjacent first pressing blocks 11 and between adjacent second pressing blocks 12 are frictionally connected to the guiding post 23. After the guiding post 23 and the gaps are completely fitted, the first pressing block 11 and the second pressing block 12 fix and press the inner brush 8 tightly.

[0046] The inner brush 8 and the outer brush 9 are both fan-shaped brush structures. The first pressing block 11 and the second pressing block 12 are both fan-shaped structures and jointly press tightly on the upper end of the inner brush 8 after the device is installed. When the device is installed in place, the inner brush 8 is pressed tightly to the inside by the first pressing block 11 and the second pressing block 12. The outer brush is as Figure 7 shown on the outside. When in use, the outer brush 9 contacts the motor rotating shaft 3. Figure 11 What is shown in the figure is the state before the conductive brush 7 is installed. Only one conductive brush 7 is shown to show the overall position of the conductive brush 7 and its state before being installed in place. At this time, the inner brush 8 is not pressed tightly by the first pressing block 11 and the second pressing block 12.

[0047] The bionic self-cleaning assembly includes a flange sleeve 13 located at the lower end of the conductive brush 7. The conductive brush 7 is pressed tightly between the brush ring 6 and the flange sleeve 13 by the first pressing block 11 and the second pressing block 12. Inside the flange sleeve 13, a plurality of air outlet channels 14 as shown in Figure 11 the figure are circumferentially arranged with the center of the middle part of the flange sleeve 13 as the center. The air outlet end of the air outlet channel 14 is a scraping ring chamber 15 with a circular structure. A scraping ring 16 is arranged in the scraping ring chamber 15 in an offset manner. The outer brush 9 is located outside the flange sleeve 13 and below the scraping ring chamber 15. The inner brush 8 and the outer brush 9 are connected by a connecting brush 10. An air outlet is provided on the connecting brush 10 to match the scraping ring chamber 15 to ensure the communication between the air outlet channel 14 and the outside. The inner brush 8, the connecting brush 10, and the outer brush 9 are of an integral structure.

[0048] The middle part of the flange sleeve 13 is connected with an air delivery pipe 17 communicated with the air outlet channel 14. The part of the air outlet channel 14 located inside the scraping ring chamber 15 is a reduced-diameter ventilation chamber 24 that gradually reduces in diameter from the outside to the inside. The inner end of the ventilation chamber 24 includes an engagement groove 25. Engagement teeth 26 are provided on the outer end face of the air delivery pipe 17 to match the engagement groove 25. The air outlet channel 14 inside the flange sleeve 13 and the air delivery pipe 17 are meshed and connected through the engagement teeth 26 and the engagement groove 25 to conduct air. The side of the brush ring 6 far from the flange sleeve 13 is connected with the housing 18. A plurality of air inlet channels 21 are opened on the housing 18. The air delivery pipe 17 is communicated with the air inlet channels 21.

[0049] The middle part of the scraping ring 16 is provided with pin holes 28 that are matched with the upper end face and the lower end face of the flange sleeve 13. The scraping ring 16 is rotatably connected in the pin holes 28 through connecting pins. The air introduced into the scraping ring chamber 15 through the air inlet channels 21, the air delivery pipe 17, and the ventilation chamber 24 drives the scraping ring 16 to rotate counterclockwise to automatically clean the dust formed by the contact between the outer brush 9 and the motor rotating shaft 3. The inner brush 8 is jointly pressed tightly on the upper end face of the flange sleeve 13 by the first pressing block 11 and the second pressing block 12. The upper end face of the flange sleeve 13 is as Figure 10 shown at B in the figure. Figure 11In order to show the structure of the air outlet channel 14 inside the flange sleeve 13, the upper end surface of the flange sleeve 13 is not shown.

[0050] The flange sleeve 13 includes a plurality of limit platforms 27 circumferentially arranged on the outer end surface. The outer brush 9 of each conductive brush 7, each scraper ring bin 15, and each scraper ring 16 are respectively located between adjacent limit platforms 27. The limit platforms 27 are matched with the guide column 23. The matched limit platforms 27 and the guide column 23 are located on the same plane. The outer brush 9 extends to the outside of the limit platform 27 toward the side away from the flange sleeve 13 and contacts with the motor shaft 3.

[0051] The connecting assembly also includes a pressing plate located on the inner side of the outer shell 18, the brush ring 6 is pressed between the pressing plates, the flange sleeve 13 is located on the inner side of the pressing plate, a pressing seat 34 and an annular cover are provided on the outer shell 18, and a plurality of clamping blocks 29 are connected to the outer end surface of the brush ring 6. The clamping block 29 is placed on the clamping seat 34 at one end close to the outer shell 18, and the clamping block 29 is clamped on the clamping seat 34 through the annular cover. The loop formed by the motor shaft 3, the conductive brush 7, the brush ring 6, the outer shell 18, the motor end cover 2, and the motor housing 1 allows the voltage to ground the shaft current before forming a path through the motor bearing of the wind turbine generator.

[0052] The pressing sheet includes an upper pressing sheet 19 and a lower pressing sheet 20. The upper pressing sheet 19 and the lower pressing sheet 20 are both provided with a clamping block 29. The upper pressing sheet 19 and the lower pressing sheet 20 include a plurality of sets of matching clamping blocks 29. The brush ring 6 and each set of matching clamping blocks 29 are staggered, which can ensure the connection between the brush ring 6 and the housing 18 and the connection between the clamping block 29 and the housing 18. The brush ring 6 is pressed between the upper pressing sheet 19 and the lower pressing sheet 20. The clamping seat 34 includes an upper clamping platform 30 and a lower clamping platform 31. The clamping block 29 on the upper pressing sheet 19 is placed on the upper clamping platform 30. The clamping block 29 on the upper and lower pressing plates 20 is placed on the lower pressing platform 31, and the annular cover includes an upper annular cover 32 and a lower annular cover 33. The clamping block 29 on the upper pressing plate 19 is pressed between the upper pressing platform 30 and the upper annular cover 32, and the clamping block 29 on the lower pressing plate 20 is pressed between the lower pressing platform 31 and the lower annular cover 33. The upper annular cover 32 and the outer shell 18 are a split structure, and the lower annular cover 33 and the outer shell 18 are an integrated structure. The lower annular cover 33 can be understood as a bottom support block of the outer shell 18, and is also a component that presses the lower pressing plate 20 together with the lower pressing platform 31.

[0053] Here’s how it works:

[0054] When the fan generator starts, the common-mode voltage of the frequency converter in the variable-frequency drive system will induce a shaft voltage through the low-impedance path formed by the motor stray capacitance, and then generate a shaft current, leading to early bearing failure. When the fan shaft current suppression device of the present invention is installed, the outer brush 9 in the conductive brush 7 is in direct contact with the motor shaft 3. Before the voltage forms a path through the motor bearing, a loop of motor shaft 3 - conductive brush 7 - brush ring 6 - housing 18 - motor end cover 2 - motor housing 1 will be formed in advance to ground the shaft current, suppressing the phenomenon of electrochemical corrosion of the motor bearing. During the working process, the upper pressing piece 19 and the lower pressing piece 20 clamp the brush ring 6 in the middle to ensure the use stability of the brush ring 6 during the working process.

[0055] During the working process, due to the long-term direct contact between the outer brush 9 in the conductive brush 7 and the motor shaft 3, a large amount of brush powder will be generated. Air enters the air duct 17 through the air intake channel 21, then enters the ventilation chamber 24 in the air outlet channel 14 from the air duct 17, and then enters the scraping ring chamber 15 in the air outlet channel 14. A scraping ring 16 is arranged in the scraping ring chamber 15 at the end of the air outlet channel 14. The entering air will drive the scraping ring 16 to rotate counterclockwise, and the scraping ring 16 will automatically clean the dust accumulated at the proximal end, and the air flow in the air outlet channel 14 will play a role in cleaning the dust at the distal end. The whole process does not require manual active operation.

[0056] The embodiments of the present invention have been shown and described. It can be understood that the above embodiments are exemplary and should not be construed as limitations on the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A fan shaft current suppression device based on an insect multi-legged self-cleaning bionic structure, which is installed on a fan generator. The fan generator includes a motor housing and a motor end cover provided at the end of the motor housing. The motor housing includes a motor rotating shaft, and is characterized in that, The fan shaft current suppression device includes a connection assembly, a conductive brush assembly, and a bionic self-cleaning assembly; The conductive brush assembly includes a brush ring and conductive brushes. The conductive brushes include inner brushes and outer brushes in a stepped shape, and the outer brushes are in contact with the motor rotating shaft. A plurality of first pressing blocks are provided at the inner end of the brush ring, and second pressing blocks are provided on the outer sides of the first pressing blocks. The bionic self-cleaning assembly includes a flange sleeve located at the lower end of the conductive brush. The conductive brush is pressed between the brush ring and the flange sleeve by the first pressing blocks and the second pressing blocks; A plurality of air outlet channels are circumferentially formed in the flange sleeve with the middle of the flange sleeve as the center. The air outlet end of the air outlet channel is a scraping ring chamber with a circular structure. A scraping ring is arranged in the scraping ring chamber in an offset manner. The outer brush is located outside the flange sleeve and below the scraping ring chamber. The inner brush and the outer brush are connected by a connecting brush. An air outlet is formed in the connecting brush to match the scraping ring chamber. The inner brush, the connecting brush, and the outer brush are of an integral structure; A gas transmission pipe communicating with the air outlet channels is connected to the middle of the flange sleeve. The connection assembly includes a housing and pressing pieces located inside the housing. The brush ring is pressed between the pressing pieces. The flange sleeve is located on the inner side of the pressing pieces. One side of the brush ring away from the flange sleeve is connected to the housing. A plurality of air inlet channels are formed in the housing, and the gas transmission pipe is connected to the air inlet channels; Pin holes are formed in the middle of the scraping ring to match the upper end face and the lower end face of the flange sleeve. The scraping ring is rotatably connected in the pin holes through connecting pins. The air introduced into the scraping ring chamber through the air inlet channels, the gas transmission pipe, and the ventilation chamber drives the scraping ring to rotate counterclockwise to clean the dust formed by the contact between the outer brush and the motor rotating shaft; The loop formed by the motor rotating shaft, the conductive brush, the brush ring, the housing, the motor end cover, and the motor housing enables the shaft current to be grounded before the voltage forms a path through the motor bearing of the fan generator; the air entering through the air inlet channels, the gas transmission pipe, and the air outlet channels drives the scraping ring to rotate and clean the dust; the fan shaft current suppression device is connected to the motor end cover by the connection assembly.

2. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 1, characterized in that Guide grooves are formed between adjacent first pressing blocks. Guide posts located on the flange sleeve are arranged in the guide grooves. Adjacent second pressing blocks are located on both sides of the guide posts.

3. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 2, wherein, The part of the air outlet channel located inside the scraping ring chamber is a reduced-diameter ventilation chamber with a gradually reduced diameter from outside to inside. The inner end of the ventilation chamber includes a meshing groove; meshing teeth are provided on the outer end face of the gas transmission pipe to match the meshing groove; the air outlet channels in the flange sleeve and the gas transmission pipe are meshed and connected and communicated through the meshing teeth and the meshing groove.

4. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 3, characterized in that The flange sleeve includes a plurality of limiting platforms circumferentially arranged on the outer end face. The outer brushes of each conductive brush, each scraping ring chamber, and each scraping ring are respectively located between adjacent limiting platforms; the limiting platforms are arranged to match the guide posts, and the matching limiting platforms and guide posts are located on the same plane.

5. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 4, wherein Both the inner brush and the outer brush are in a fan-shaped brush structure; the outer brush extends towards the side away from the flange sleeve to the outside of the limiting platform and is in contact with the motor rotating shaft; both the first pressing block and the second pressing block are in a fan-shaped structure and jointly press the upper end of the inner brush.

6. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 5, characterized in that, The inner brush is jointly pressed on the upper end face of the flange sleeve by the first pressing block and the second pressing block.

7. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 1, characterized in that, The shell is provided with a clamping seat and an annular cover, the outer end surface of the brush ring is connected with a plurality of clamping blocks, one end of the clamping block close to the shell is placed on the clamping seat, and the clamping block is clamped on the clamping seat by the annular cover.

8. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 7, characterized in that, The pressing plate includes an upper pressing plate and a lower pressing plate, both of which are provided with clamping blocks, and the brush ring is pressed between the upper pressing plate and the lower pressing plate; the clamping seat includes an upper clamping platform and a lower clamping platform, the clamping block on the upper pressing plate is placed on the upper clamping platform, and the clamping block on the lower pressing plate is placed on the lower clamping platform; the annular cover includes an upper annular cover and a lower annular cover, the clamping block on the upper pressing plate is pressed between the upper clamping platform and the upper annular cover, the clamping block on the lower pressing plate is pressed between the lower clamping platform and the lower annular cover, the lower annular cover and the outer shell are an integrated structure, and the upper annular cover and the outer shell are a split structure.

9. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 8, wherein, The upper pressing plate and the lower pressing plate include a plurality of groups of matching clamping blocks, and the brush rings are staggered with the groups of matching clamping blocks.

10. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 9, wherein, A connection plate is provided on the outer peripheral surface of the shell, and a plurality of connection holes are provided in the connection plate to match the motor end cover, and the fan shaft current suppression device is connected to the motor end cover through the connection plate.

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