Fan shaft current suppression device based on insect multi-foot self-cleaning bionic structure

Abstract

The invention relates to the technical field of wind power and mechanical structures, and particularly discloses a fan shaft current suppression device based on an insect multi-foot self-cleaning bionic structure, the fan shaft current suppression device comprises a conductive brush, an electric brush ring, a flange sleeve, a scraping ring and a shell, a plurality of air outlet channels are formed in the flange sleeve, and the middle of the flange sleeve is connected with an air conveying pipe communicated with the air outlet channels; an air inlet channel is formed in the shell, through a loop formed by the motor rotating shaft, the conductive brush, the electric brush ring, the shell, the motor end cover and the motor shell, shaft current is grounded before shaft voltage passes through a motor bearing of the fan generator to form a passage, and air entering through the air inlet channel, the air conveying pipe and the air outlet channel drives the scraping ring to rotate and clean dust. The device is simple and convenient in structure, long in abrasion life, stable in contact resistance, capable of achieving surrounding contact grounding, good in grounding effect and capable of effectively restraining generation of shaft current, improving blocking performance, ensuring stable operation of a motor and reducing 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 failure of the bearing. The shaft current will cause surface damage and increased friction of the bearing, thus 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 the shaft current is the brush solution. The following documents in the prior art involve the shaft current brush solution: 1. The patent document with the publication number of "CN222483932U" and the name of "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.

[0004] 2. The patent document with the publication number of "CN113949221B" and the name of "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 fixed pressing plate, and 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.

[0005] The above shaft current brush solutions in the prior art have the following problems and current solutions: 1. Poor contact problem. Poor contact may lead to an increase in resistance, thus reducing the power transmission efficiency, and even triggering sparks and arcs, which will damage the motor.

[0006] For the problem of poor contact, the current solutions include regular inspection, maintenance, and improvement of the brush materials (such as using high-conductivity and high-wear-resistant composite materials) and structures. Regular inspection and maintenance consume a large amount of manpower and material resources. High-conductivity materials help ensure a high contact conductivity between the brush and the motor shaft. Specific processes and designs are required. Good contact between the brush and the motor shaft can ensure the conductive effect, and a well-designed brush structure is needed.

[0007] 2. Problem of toner accumulation and inability to self-clean. The accumulation of toner may increase the resistance between motor components, resulting in more heat generation when current passes through, further exacerbating the overheating problem of the motor.

[0008] Regarding the problem of toner accumulation, current solutions include regular cleaning and setting up carbon brush dust collectors on the motor. Regular cleaning requires a large amount of time, manpower, and material resources. The carbon brush dust collector can remove the toner inside the motor in real time to avoid its accumulation, but it cannot eliminate the toner accumulation on devices outside the motor housing.

[0009] In summary, in order to solve the problems of poor contact and inability to self-clean of the shaft current brush solution, there is an urgent need to involve a new type of fan shaft current suppression device. Summary of the Invention

[0010] In order 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 overall device's suppression effect on shaft current is not affected, can ensure that the device maintains good cleanliness during operation, and can solve the problem that the carbon powder deposition may cause the surface of the carbon brush filaments to become uneven.

[0011] 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 rotating shaft. The fan shaft current suppression device includes a connection component, a conductive brush component, and a bionic self-cleaning component; 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 rotating shaft; a plurality of pressing blocks one are provided at the inner end of the brush ring, and pressing blocks two are provided outside the pressing blocks one; the bionic self-cleaning component 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 through the pressing blocks one and the pressing blocks two; A plurality of air outlet channels are circumferentially opened in the flange sleeve with the center of the flange sleeve as the center. The air outlet end of the air outlet channel is a circular structure of a scraping ring chamber. A scraping ring is arranged in the scraping ring chamber in an offset manner; the outer brushes are located outside the flange sleeve and below the scraping ring chamber. The inner brushes and the outer brushes are connected by connecting brushes. Air outlet openings are provided on the connecting brushes to match the scraping ring chamber. The inner brushes, the connecting brushes, and the outer brushes 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 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 pieces. The side of the brush ring away from the flange sleeve is connected to the housing; a plurality of air inlet channels are opened on the housing, and the gas transmission pipe is connected to the air inlet channels; The circuit formed by the motor shaft, conductive brush, brush ring, housing, motor end cover, and 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 intake passage, air delivery pipe, and air outlet passage drives the scraping ring to rotate and clean the dust.

[0012] Further, guide grooves are formed between adjacent first pressing blocks, guide posts located on the flange sleeve are provided in the guide grooves, and adjacent second pressing blocks are located on both sides of the guide posts.

[0013] Further, the part of the air outlet passage inside the scraping ring chamber is a reduced-diameter ventilation chamber with a gradually decreasing diameter from outside to inside, the inner end of the ventilation chamber includes an engaging groove; engaging teeth are provided on the outer end face of the air delivery pipe to match the engaging groove; the air outlet passage inside the flange sleeve and the air delivery pipe are engaged and connected through the engaging teeth and the engaging groove and are communicated.

[0014] Further, the flange sleeve includes a plurality of limiting platforms arranged circumferentially 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 in a matching manner with the guide posts, and the matching limiting platforms and guide posts are on the same plane.

[0015] Further, both the inner brush and the outer brush are in a fan-shaped brush structure; the outer brush extends toward the side away from the flange sleeve to the outside of the limiting platform and contacts the motor 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.

[0016] Further, pin holes are formed in a matching manner on the upper and lower end faces of the flange sleeve and the middle part of the scraping ring, and the scraping ring is rotatably connected in the pin holes through connecting pins; the air introduced into the scraping ring chamber through the air intake passage, air delivery pipe, and ventilation chamber drives the scraping ring to rotate counterclockwise to clean the dust formed by the contact between the outer brush and the motor 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.

[0017] Further, a pressing seat and an annular cover are provided on the housing, a plurality of clamping blocks are connected to the outer end face of the brush ring, one end of the clamping block close to the housing is placed on the pressing seat, and the clamping block is pressed by the annular cover on the pressing seat.

[0018] Further, the pressing piece includes an upper pressing piece and a lower pressing piece, clamping blocks are provided on both the upper pressing piece and the lower pressing piece, and the brush ring is pressed between the upper pressing piece and the lower pressing piece; the pressing seat includes an upper pressing platform and a lower pressing platform, the clamping block on the upper pressing piece is placed on the upper pressing platform, and the clamping block on the lower pressing piece is placed on the lower pressing platform; the annular cover includes an upper annular cover and a lower annular cover, the clamping block on the upper pressing piece is pressed between the upper pressing platform and the upper annular cover, the clamping block on the lower pressing piece is pressed between the lower pressing platform and the lower annular cover, the lower annular cover is an integral structure with the housing, and the upper annular cover is a split structure with the housing.

[0019] 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.

[0020] 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.

[0021] Compared with the prior art, the present invention can achieve the following beneficial effects: 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.

[0022] 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

[0023] 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; Figure 2 The overall structure of the fan shaft current suppression device provided by the embodiment of the present invention is shown in FIG. Figure 1 ; Figure 3 The partial structure diagram of the fan shaft current suppression device provided by the embodiment of the present invention is Figure 1 (Connection plate and upper annular cover are not shown); Figure 4 The partial structure diagram of the fan shaft current suppression device provided by the embodiment of the present invention is Figure 2 (Connection plate and upper pressing plate are not shown); Figure 5 The overall structure of the fan shaft current suppression device provided by the embodiment of the present invention is shown in FIG. Figure 2 ; Figure 6 The partial structure diagram of the fan shaft current suppression device provided by the embodiment of the present invention is Figure 3(The outer shell, connection plate, and lower annular cover are not shown); Figure 7 It is a schematic structure diagram of a flange sleeve and a conductive brush assembly in a fan shaft current suppression device provided according to an embodiment of the present invention; Figure 1 ; Figure 8 It is a schematic structure diagram of a flange sleeve and a conductive brush assembly in a fan shaft current suppression device provided according to an embodiment of the present invention; Figure 2 (The conductive brush is not shown); Figure 9 It is a schematic structure diagram of a flange sleeve and a guide post in a fan shaft current suppression device provided according to an embodiment of the present invention; Figure 10 It is a partial structure schematic diagram of a brush ring in a fan shaft current suppression device provided according to an embodiment of the present invention; Figure 11 It is a schematic structure diagram of a conductive brush and an air outlet channel in a 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).

[0024] The reference numerals therein include: motor housing 1, motor end cover 2, motor rotating shaft 3, connection plate 4, connection hole 5, brush ring 6, conductive brush 7, inner brush 8, outer brush 9, connection brush 10, first pressing block 11, second pressing block 12, flange sleeve 13, air outlet channel 14, scraping ring chamber 15, scraping ring 16, air delivery pipe 17, outer shell 18, upper pressing piece 19, lower pressing piece 20, air inlet channel 21, guide groove 22, guide post 23, ventilation chamber 24, engagement groove 25, engagement tooth 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. Specific embodiments

[0025] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following Figure 1-11 are further described in detail in conjunction with the attached 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 and do not constitute a limitation to the present invention.

[0026] 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 overall fan shaft current suppression device is as Figure 1 shown at position A in the figure, and the fan shaft current suppression device is installed on the motor end cover 2.

[0027] The fan shaft current suppression device includes a connection component, a conductive brush component, and a bionic self-cleaning component. The connection component connects the fan shaft current suppression device to the motor end cover 2. Specifically, as Figure 1 , Figure 2 shown, the connection component includes a housing 18. A connection disk 4 is provided on the outer peripheral surface of the housing 18. The connection disk 4 and the motor end cover 2 are provided with a plurality of connection holes 5 in a matching manner. The fan shaft current suppression device is connected to the motor end cover 2 through the connection disk 4.

[0028] The conductive brush component includes a brush ring 6 and conductive brushes 7. The conductive brushes 7 include Figure 11 the stepped inner brush 8 and outer brush 9 shown in . 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 column 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 column 23. The gaps between adjacent first pressing blocks 11 and between adjacent second pressing blocks 12 are frictionally connected to the guiding column 23. After the guiding column 23 completely fits with the gaps, the first pressing blocks 11 and the second pressing blocks 12 fix and press the inner brush 8 tightly.

[0029] Both the inner brush 8 and the outer brush 9 are fan-shaped brush structures. The first pressing blocks 11 and the second pressing blocks 12 are both fan-shaped structures and jointly press 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 into the interior by the first pressing blocks 11 and the second pressing blocks 12. The outer brush is located outside as Figure 7 shown. During use, the outer brush 9 contacts the motor rotating shaft 3. Figure 11 What is shown in is the state before the conductive brush 7 is installed. Only one conductive brush 7 is shown to display 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 blocks 11 and the second pressing blocks 12.

[0030] The bionic self-cleaning component 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 blocks 11 and the second pressing blocks 12. A plurality of air outlet channels 14 as shown in Figure 11 are circumferentially formed in the flange sleeve 13 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 opened 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.

[0031] In the middle of the flange sleeve 13, an air delivery pipe 17 communicating with the air outlet channel 14 is connected. The part of the air outlet channel 14 inside the scraping ring bin 15 is a reduced-diameter ventilation bin 24 with a gradually reduced diameter from outside to inside. The inner end of the ventilation bin 24 includes an engagement groove 25. On the outer end face of the air delivery pipe 17, engagement teeth 26 are provided to match the engagement groove 25. The air outlet channel 14 inside the flange sleeve 13 and the air delivery pipe 17 are engaged and connected through the engagement teeth 26 and the engagement groove 25 to conduct air. On the side of the brush ring 6 away from the flange sleeve 13, it is connected to the housing 18. A plurality of air inlet channels 21 are provided on the housing 18, and the air delivery pipe 17 is connected and communicated with the air inlet channels 21.

[0032] In the middle of the scraping ring 16, pin holes 28 are respectively and correspondingly provided on 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 bin 15 through the air inlet channels 21, the air delivery pipe 17, and the ventilation bin 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 against the upper end face of the flange sleeve 13 by the pressing block one 11 and the pressing block two 12. The upper end face of the flange sleeve 13 is as Figure 10 shown at B in the figure. Figure 11 In the figure, in order to show the structure of the air outlet channel 14 inside the flange sleeve 13, the upper end face of the flange sleeve 13 is not shown.

[0033] The flange sleeve 13 includes a plurality of limiting platforms 27 arranged circumferentially on the outer end face. The outer brushes 9 of each conductive brush 7, each scraping ring bin 15, and each scraping ring 16 are respectively located between adjacent limiting platforms 27. The limiting platforms 27 are matched with the guide posts 23. The matched limiting platforms 27 and the guide posts 23 are on the same plane. The outer brush 9 extends towards the side away from the flange sleeve 13 to the outside of the limiting platform 27 and contacts the motor rotating shaft 3.

[0034] The connection assembly further includes a pressing piece inside the housing 18. The brush ring 6 is pressed between the pressing pieces. The flange sleeve 13 is located inside the pressing pieces. On the housing 18, a pressing seat 34 and an annular cover are provided. A plurality of clamping blocks 29 are connected to the outer end face of the brush ring 6. One end of the clamping block 29 close to the housing 18 is placed on the pressing seat 34, and the clamping block 29 is pressed by the annular cover on the pressing seat 34. The loop formed by the motor rotating shaft 3, the conductive brush 7, the brush ring 6, the housing 18, the motor end cover 2, and the motor housing 1 enables the shaft current to be grounded before the voltage forms a path through the motor bearing of the fan generator.

[0035] 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.

[0036] Here’s how it works: When the fan generator starts, the common mode voltage of the inverter in the variable frequency drive system will induce shaft voltage through the low impedance path formed by the stray capacitance of the motor, and then generate shaft current, causing early failure of the bearing. When the fan shaft current suppression device 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 is formed in advance to ground the shaft current, thereby suppressing the electrical corrosion of the motor bearing. During operation, the upper pressing plate 19 and the lower pressing plate 20 clamp the brush ring 6 in the middle to ensure the stability of the brush ring 6 during operation.

[0037] 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. The air enters the air pipe 17 through the air inlet channel 21, and then enters the ventilation bin 24 in the air outlet channel 14 from the air pipe 17, and then enters the scraper ring bin 15 in the air outlet channel 14. A scraper ring 16 is arranged in the scraper ring bin 15 at the end of the air outlet channel 14. The incoming air will drive the scraper ring 16 to rotate counterclockwise, and the scraper ring 16 will automatically clean the dust accumulated at the near end, and the flow of air in the air outlet channel 14 will play a role in cleaning the dust at the far end. The whole process does not require active human operation.

[0038] The embodiments of the present invention have been shown and described. It is understood that the above embodiments are exemplary and cannot be construed as limiting the present invention. A person skilled in the art may 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, installed on a fan generator, the fan generator includes a motor housing and a motor end cover arranged at the end of the motor housing, the motor housing includes a motor shaft, characterized in that: The fan shaft current suppression device includes a connection component, a conductive brush component and a bionic self-cleaning component; The conductive brush assembly includes a brush ring and a conductive brush, wherein the conductive brush includes an inner brush and an outer brush in a stepped shape, and the outer brush contacts the motor shaft; a plurality of pressure blocks 1 are provided at the inner end of the brush ring, and a pressure block 2 is provided at the outer side of the pressure block 1; the bionic self-cleaning assembly includes a flange sleeve located at the lower end of the conductive brush, and the conductive brush is pressed between the brush ring and the flange sleeve by the pressure blocks 1 and 2; A plurality of air outlet channels are provided in the flange sleeve along the circumferential direction with the middle of the flange sleeve as the center, and the air outlet end of the air outlet channel is a scraper ring bin of a circular structure, and a scraper ring is provided in the scraper ring bin in an offset manner; the outer brush is located outside the flange sleeve and below the scraper ring bin, the inner brush and the outer brush are connected by a connecting brush, and an air outlet is provided on the connecting brush to match the scraper ring bin, and the inner brush, the connecting brush and the outer brush are an integrated structure; The middle of the flange sleeve is connected to an air delivery pipe connected to the air outlet channel; the connecting assembly includes a shell and a pressing plate located inside the shell, the brush ring is pressed between the pressing plates, the flange sleeve is located on the inner side of the pressing plate, and the side of the brush ring away from the flange sleeve is connected to the shell; a plurality of air inlet channels are opened on the shell, and the air delivery pipe is connected to the air inlet channels; The circuit formed by the motor shaft, conductive brush, brush ring, casing, motor end cover and motor housing allows the voltage to ground the shaft current before forming a path through the motor bearing of the fan generator; the air entering through the air inlet channel, air pipe and air outlet channel drives the scraper ring to rotate and clean the dust.

2. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 1 is characterized in that: A guide groove is formed between adjacent first pressing blocks, a guide column located on the flange sleeve is arranged in the guide groove, and adjacent second pressing blocks are located on both sides of the guide column.

3. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 2 is characterized in that: The part of the air outlet channel located on the inner side of the scraper ring bin is a reducing-diameter vent bin whose diameter gradually decreases from the outside to the inside, and the inner end of the vent bin includes an engaging groove; engaging teeth matching the engaging groove are provided on the outer end surface of the air pipe; the air outlet channel in the flange sleeve is engaged and connected with the air pipe through the engaging teeth and the engaging groove.

4. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 3 is characterized in that: The flange sleeve includes a plurality of limit platforms arranged on the outer end surface along the circumferential direction, and the outer brush of each conductive brush, each scraper ring bin, and each scraper ring are respectively located between adjacent limit platforms; the limit platform is matched with the guide column, and the matched limit platform and the guide column 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 is characterized in that: The inner brush and the outer brush are both fan-shaped brush structures; the outer brush extends to the outside of the limit platform toward the side away from the flange sleeve and contacts the motor shaft; the first and second pressing blocks are both fan-shaped structures and are pressed together on 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 is characterized in that: Pin holes are provided in the middle part of the scraper ring to match the upper and lower end surfaces of the flange sleeve, and the scraper ring is rotatably connected in the pin hole through a connecting pin; the air introduced into the scraper ring bin through the air inlet channel, the air pipe, and the ventilation bin drives the scraper ring to rotate counterclockwise to clean the dust formed by the contact between the outer brush and the motor shaft; the inner brush is pressed against the upper end surface of the flange sleeve by pressing blocks 1 and 2.

7. The fan shaft current suppression device based on the insect multi-legged self-cleaning bionic structure according to claim 1 is 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 is 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 is characterized in that: 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 is characterized in that: 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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