Centrifugal fan with noise reduction function for lithium battery industry

Abstract

The application discloses a centrifugal ventilator with a noise reduction function for a lithium battery industry, and relates to the technical field of centrifugal fans, comprising a mounting frame, a damping unit, a cleaning unit, a noise reduction unit and a driving unit, wherein the mounting frame is used for the damping unit, the cleaning unit, the noise reduction unit and the driving unit; the damping unit is used for reducing the vibration of the machine body; the cleaning unit is used for cleaning the filter plate, preventing the increase of air resistance from causing the decrease of air volume; the noise reduction unit is used for reducing the noise of the air outlet of the fan; and the driving unit is used for providing a power source for the fan. During the operation of the centrifugal ventilator through the driving unit, the machine body is damped through the damping unit, the filter plate is cleaned through the cleaning unit, the ventilation volume is ensured and dust pollution is avoided, the noise at the air outlet is reduced through the noise reduction unit, and a good working environment is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centrifugal fan, in particular to a centrifugal fan with noise reduction function for lithium battery industry. BACKGROUND

[0002] In the process of manufacturing lithium batteries, the cleanliness, humidity, temperature and safety of the production environment are extremely demanding. As the core power equipment of the environmental control system, centrifugal fan is widely used in the exhaust, air supply and process gas circulation of workshops such as coating, baking, laminating and liquid injection. However, the special working conditions of lithium battery industry pose a severe challenge to traditional centrifugal fan.

[0003] Lithium battery production workshop is usually a large clean factory building, which is spacious and has serious reverberation. The aerodynamic noise and structural noise generated by the operation of the fan will be amplified, resulting in excessive overall sound pressure level. Excessive noise not only damages the health of employees and affects communication, but also may interfere with the normal operation of precision instruments.

[0004] The dynamic balance precision of fan guide plate is easily deteriorated by dust attachment at high speed, resulting in increased vibration of the whole machine. The vibration is transmitted to the building structure through the base, forming solid sound transmission and radiating low-frequency noise. More seriously, continuous vibration will cause fatigue damage to the connecting parts, shorten the service life of the equipment, and even pose a risk of safety accidents caused by loosening.

[0005] To ensure the cleanliness of the air supplied to the workshop, the inlet of the fan is equipped with a primary or medium efficiency filter to intercept particulate matter in the air. The dust generated in the process of lithium battery production, such as graphite and electrode material powder, has the characteristics of lightness, smallness and easy adsorption, which will quickly clog the filter mesh, resulting in continuous increase of fan inlet resistance. The increase of wind resistance directly leads to two problems: first, the energy consumption increases significantly; second, the air volume decreases, which cannot meet the process requirements. At present, the cleaning of filter completely depends on regular replacement or cleaning by manual, which not only increases the workload and contact risk of maintenance personnel, but also keeps the system in a non-optimal performance state during the maintenance period. Even if it is not replaced in time, it may become a source of pollution. In order to avoid the blockage of filter and the fluctuation of wind pressure, the resistance balance of the ventilation system will be destroyed, resulting in insufficient air volume in some pipes, and wind pressure mutation may cause pipe resonance, abnormal noise and vibration, affecting the working environment and accelerating the loosening and leakage of pipe connections. SUMMARY

[0006] The purpose of the present application is to provide a centrifugal fan with noise reduction function for lithium battery industry to solve the problems in the prior art.

[0007] To achieve the above purpose, the present application provides the following technical scheme:

[0008] The centrifugal fan with noise reduction function for lithium battery industry, including mounting frame, damping unit, cleaning unit, noise reduction unit and driving unit, the mounting frame is placed on the horizontal ground, the mounting frame is provided with a controller, the damping unit and the driving unit are fixedly connected, the damping unit has the function of reducing the vibration of the machine body, the cleaning unit and the mounting frame are fixedly connected, the cleaning unit and the driving unit are rotatably connected, the noise reduction unit and the driving unit are fixedly connected, and the driving unit and the mounting frame are fixedly connected.

[0009] The mounting frame is used for the damping unit, the cleaning unit, the noise reduction unit and the driving unit, the damping unit is used for reducing the vibration of the machine body, the cleaning unit is used for cleaning the filter plate, preventing the increase of the wind resistance and causing the decrease of the air volume, the noise reduction unit is used for reducing the noise of the fan outlet, and the driving unit is used for providing the power source for the fan.

[0010] Further, the damping unit includes a connecting rod, a slide column, a fixing frame, a clamping plate, an upper arc-shaped elastic sheet, a pull belt and a lower arc-shaped elastic sheet, two notches are formed in the connecting rod, the connecting rod and the slide column are slidably connected through the conductive ring on the connecting rod, the slide column and the fixing frame are fixedly connected, the fixing frame and the mounting frame are fixedly connected, the clamping plate has two, the clamping plate is fixedly installed on the connecting rod, the upper arc-shaped elastic sheet is slidably connected with the notch of the connecting rod, the two ends of the upper arc-shaped elastic sheet are slidably installed in the fixing frame, the two ends of the upper arc-shaped elastic sheet are connected through the pull belt, the pull belt is located in the middle of the clamping plate, the two ends of the lower arc-shaped elastic sheet are connected through the pull belt, the lower arc-shaped elastic sheet is slidably connected with the notch of the connecting rod, and the two ends of the lower arc-shaped elastic sheet are slidably installed in the fixing frame.

[0011] When the centrifugal fan is operating, the casing vibrates up and down. As the casing moves downwards, the connecting rod moves downwards along the sliding column. On one hand, the connecting rod drives the clamping plate downwards, squeezing the lower pull strap and stretching the two ends of the lower arc-shaped spring piece closer together. This increases the upward arching distance of the lower arc-shaped spring piece. At this time, the arched part of the lower arc-shaped spring piece pushes upwards against the groove of the connecting rod, inhibiting the downward movement of the connecting rod and thus suppressing the vibration of the casing. On the other hand, the conductive ring of the connecting rod is always in contact with the drive coil on the cylinder. As the connecting rod moves downwards, the effective number of turns of the drive coil gradually decreases, the resistance decreases, and the current supplied to the spring-loaded electric telescopic rod increases, causing the spring-loaded electric telescopic rod to continuously extend. As the housing moves upward, the connecting rod moves upward along the sliding column. On one hand, the connecting rod drives the clamping plate upward, squeezing the upper strap and stretching the two ends of the upper arc-shaped spring piece closer together, increasing the downward arching distance of the upper arc-shaped spring piece. At this time, the arched part of the upper arc-shaped spring piece pushes down to the groove of the connecting rod, inhibiting the upward movement of the connecting rod, thereby suppressing the vibration of the housing and jointly achieving the shock absorption effect of the housing. On the other hand, the conductive ring of the connecting rod is always in contact with the drive coil on the cylinder. As the connecting rod moves upward, the effective number of turns of the drive coil gradually increases, the resistance increases, and the current supplied to the spring electric telescopic rod decreases, causing the spring electric telescopic rod to continuously shorten under the action of its own restoring force.

[0012] Furthermore, the cleaning unit includes a stand, a spring-loaded electric telescopic rod, a sliding rod, a moving block, a conductive ring, a conductive plate, and an insulating plate. The stand is fixedly mounted on the mounting frame. The fixed end of the spring-loaded electric telescopic rod is fixedly mounted on the stand. The spring-loaded electric telescopic rod is fixedly connected to the moving block. The spring-loaded electric telescopic rod is electrically connected to the conductive ring on the connecting rod. Both ends of the sliding rod are fixedly connected to the stand. The moving block is slidably connected to the stand. The conductive ring is slidably mounted on the sliding rod. The conductive plate is slidably connected to the sliding rod and is fixedly mounted on one side of the moving block. The insulating plate is slidably connected to the sliding rod and the conductive ring is located between the conductive plate and the insulating plate.

[0013] Furthermore, the cleaning unit also includes a long plate, a chute, a cylinder, a slider, an arc frame, a scraper, and a bent rod. The long plate is fixedly connected to the moving block, the chute is slidably connected to the long plate, the chute is fixedly connected to the cylinder, the cylinder is rotatably connected to the slider, the slider is slidably mounted on the arc frame, the arc frame is fixedly connected to the upright frame, one end of the scraper is fixedly connected to the slider, the other end of the scraper is rotatably connected to the arc frame, and one end of the bent rod is fixedly connected to the long plate.

[0014] Furthermore, the cleaning unit also includes a trough plate, a spring-loaded electric push rod, a lever, a spring cylinder, a filter screen, and a lever plate. The other end of the bent rod is fixedly connected to the trough plate. The fixed end of the spring-loaded electric push rod is fixedly installed on the trough plate. The telescopic end of the spring-loaded electric push rod is fixedly connected to the lever. The lever is slidably connected to the trough plate. The spring cylinder is fixedly connected to the filter screen. The lever plate is fixedly connected to the spring cylinder. The spring-loaded electric push rod is electrically connected to the conductive plate.

[0015] During the extension of the spring-loaded electric telescopic rod, the moving block slides to the right along the upright frame. At this time, the insulating plate contacts the conductive ring and does not supply power to the spring-loaded electric push rod. The spring-loaded electric push rod remains in the retracted state and does not contact the lever plate. During the movement of the moving block and the long plate to the left, on the one hand, the channel plate moves synchronously to the left under the transmission action of the bent rod. On the other hand, the slide groove, under the transmission action of the cylinder, drives the slider to slide along the arc frame from the high point on the left to the high point on the right. During the sliding of the slider, the scraper swings around the arc frame, thereby cleaning the filter screen surface. During the retraction of the spring-loaded electric telescopic rod, the moving block slides to the left along the upright frame. At this time, the insulating plate and the conductive ring... The ring makes contact, allowing the controller's current to flow through the conductive ring and conductive plate to power the spring-loaded electric push rod. At this time, the spring-loaded electric push rod extends and pushes the lever to slide upward along the slot plate. The lever moves the spring cylinder clockwise, causing the filter screen to rotate clockwise synchronously. As the moving block moves the long plate to the left, on the one hand, the slot plate moves synchronously to the left under the transmission action of the bent rod, and on the other hand, the slide groove moves the slider along the arc frame from the high point on the right to the high point on the left under the transmission action of the cylinder. During this process, relative sliding occurs between the slide groove and the long plate. As the slider slides, it causes the scraper to swing around the arc frame, thereby cleaning the surface of the filter screen and removing the dust attached to the filter screen, thus preventing the fan from being blocked and affecting the airflow.

[0016] Furthermore, the noise reduction unit includes a rotating rod and a sound-absorbing plate, the sound-absorbing plate being rotatably connected to the rotating rod, and the sound-absorbing plate being provided with sound-absorbing holes.

[0017] The air discharged from the fan outlet is absorbed by the sound-absorbing plate, achieving a noise reduction effect and thus providing a good working environment.

[0018] Furthermore, the drive unit includes a housing, a guide plate, a straight rod, a drive motor, a base, blades, a mounting frame, a round rod, a rotating block, an arc-shaped return spring, a counterweight, an arc-shaped groove, a baffle, and a pull rope. The connecting rod is fixedly connected to the housing, the spring cylinder is rotatably connected to the housing, the guide plate is installed inside the housing, and the guide plate is fixedly connected to the housing via a connecting rod. One end of the straight rod is fixedly connected to the mounting frame, and the other end of the straight rod passes through the housing and is fixedly connected to the output end of the drive motor. The fixed end of the drive motor is fixedly mounted. On the base, the base is fixedly connected to the mounting frame, the blade is fixedly connected to the round rod, the round rod is rotatably connected to the mounting frame, the rotating block is fixedly installed on the round rod, the rotating block is provided with a rectangular plate, one end of the rotating block is connected to the mounting frame through an arc-shaped return spring, the other end of the rotating block is connected to the counterweight block through a pull rope, the counterweight block is slidably installed in an arc-shaped slide groove, the arc-shaped slide groove is fixedly installed on the surface of the mounting frame near the drive motor, the baffle is fixedly connected to the straight rod, and the baffle abuts against the counterweight block.

[0019] The controller starts the drive motor, which, under the transmission of the straight rod, drives the blades on the mounting frame to rotate, drawing outside air into the housing. At this time, the counterweight moves outward a certain distance along the arc-shaped slide under the action of centrifugal force and the reaction force of the airflow and maintains its current position. When the filter becomes clogged, causing the air intake to decrease, the reaction force of the airflow inside the housing decreases. At this time, the centrifugal force on the counterweight remains unchanged, and the counterweight continues to move outward along the arc-shaped slide. Under the action of the arc-shaped return spring's own restoring force, it pulls the rotating block to rotate, thereby driving the round rod and the blades to rotate synchronously, thus increasing the blade outlet angle. The kinetic energy given to the airflow by the blades increases, the outlet speed increases, and thus the wind pressure increases. This avoids the wind pressure fluctuations caused by filter clogging, which would disrupt the resistance balance of the ventilation system, leading to insufficient airflow in some ducts and causing duct resonance.

[0020] Furthermore, a drive coil is provided on the sliding column, and the end of the drive coil closest to the horizontal ground is the current input terminal.

[0021] To change the current supplied to the spring-driven electric telescopic rod by the drive coil during the vibration of the housing, causing the spring-driven electric telescopic rod to extend and retract, thereby driving the scraper to clean the filter screen.

[0022] Furthermore, the rotation speed of the filter screen is less than the rotation speed of the scraper.

[0023] When the scraper rotates at a higher speed, the high-speed scraper uses shearing force to more thoroughly remove particles from the filter mesh pores, avoiding residual clogging. At the same time, the rotation of the filter mesh is to prevent the area where the scraper cleans the filter mesh from being fixed, which would prevent dust from being removed from other areas and affect the cleaning effect.

[0024] Furthermore, the two ends of the rotating rod are fixedly installed on the inner wall of the air outlet of the housing, and in the vertical direction, the included angle between the sound-absorbing plate and the vertical axis is in the range of 30°-60°.

[0025] The outlet airflow of centrifugal fans usually has high turbulence intensity. If the silencer plate is perpendicular to the airflow direction, it will aggravate airflow separation and vortex generation, causing additional aerodynamic noise. The inclined silencer plate can guide the airflow to transition smoothly along the plate surface and reduce turbulence.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. This invention addresses the issue of vibration in the centrifugal fan's operating state. During the centrifugal fan's downward movement, the connecting rod moves downwards along the sliding column. On one hand, the connecting rod drives the clamping plate downwards, squeezing and pulling the lower band, causing the two ends of the lower arc-shaped spring piece to move closer together. This increases the upward arching distance of the lower arc-shaped spring piece. At this time, the arched part of the lower arc-shaped spring piece pushes upwards against the groove of the connecting rod, inhibiting the downward movement of the connecting rod and thus suppressing the vibration of the shell. On the other hand, the conductive ring of the connecting rod remains in contact with the drive coil on the cylinder. During the downward movement of the connecting rod, the effective number of turns of the drive coil gradually decreases, reducing its resistance and increasing the current supplied to the spring-loaded electric telescopic rod, thus maintaining the spring-loaded electric telescopic rod's position. As the shell moves upward, the connecting rod moves upward along the sliding column. On one hand, the connecting rod drives the clamping plate upward, squeezing the upper strap and stretching the two ends of the upper arc-shaped spring piece closer together, increasing the downward arching distance of the upper arc-shaped spring piece. At this time, the arched part of the upper arc-shaped spring piece pushes down to the groove of the connecting rod, inhibiting the upward movement of the connecting rod, thereby inhibiting the vibration of the shell and jointly achieving the shock absorption effect of the shell. On the other hand, the conductive ring of the connecting rod is always in contact with the drive coil on the cylinder. As the connecting rod moves upward, the effective number of turns of the drive coil gradually increases, the resistance increases, and the current supplied to the spring electric telescopic rod decreases, so that the spring electric telescopic rod continues to shorten under the action of its own restoring force.

[0028] 2. In this invention, during the extension of the spring-powered telescopic rod, the moving block slides to the right along the upright frame. At this time, the insulating plate contacts the conductive ring and does not supply power to the spring-powered push rod. The spring-powered push rod remains in a retracted state and does not contact the lever plate. During the movement of the moving block and the long plate to the left, on the one hand, the groove plate moves synchronously to the left under the transmission action of the bent rod; on the other hand, the slide groove, under the transmission action of the cylinder, drives the slider to slide along the arc frame from the high point on the left to the high point on the right. During this process, relative sliding occurs between the slide groove and the long plate. During the sliding of the slider, the scraper swings around the arc frame, thereby cleaning the filter screen surface. During the retraction of the spring-powered telescopic rod, the moving block slides to the left along the upright frame. At this time, the conductive ring... When the plate contacts the conductive ring, the current from the controller flows through the conductive ring and the conductive plate to power the spring-loaded electric push rod. At this time, the spring-loaded electric push rod extends and pushes the lever to slide upward along the slot plate. The lever moves the spring cylinder clockwise, causing the filter screen to rotate clockwise synchronously. As the moving block moves the long plate to the left, the slot plate moves synchronously to the left under the transmission action of the bent rod. On the other hand, the slide groove moves the slider along the arc frame from the high point on the right to the high point on the left under the transmission action of the cylinder. During this process, relative sliding occurs between the slide groove and the long plate. As the slider slides, it drives the scraper to swing around the arc frame, thereby cleaning the surface of the filter screen and removing the dust attached to the surface of the filter screen, thus preventing the fan from being blocked and affecting the airflow.

[0029] 3. The present invention addresses the issue that the airflow at the outlet of a centrifugal fan typically has high turbulence intensity. If the silencer plate is perpendicular to the airflow direction, it will exacerbate airflow separation and vortex generation, causing additional aerodynamic noise. The inclined silencer plate can guide the airflow to transition smoothly along the plate surface, reducing turbulence.

[0030] 4. This invention uses a controller to start the drive motor, which, under the transmission of the straight rod, drives the blades on the mounting frame to rotate, drawing external gas into the housing. At this time, the counterweight moves outward along the arc-shaped groove under the action of centrifugal force and the reaction force of the airflow and maintains its current position. When the filter becomes clogged, causing a decrease in the air intake, the reaction force of the airflow inside the housing decreases. At this time, the centrifugal force on the counterweight remains unchanged, and the counterweight continues to move outward along the arc-shaped groove. Under the action of the arc-shaped return spring's own restoring force, it pulls the rotating block to rotate, thereby driving the round rod and the blades to rotate synchronously, thereby increasing the blade outlet angle. The kinetic energy given to the airflow by the blades increases, the outlet speed increases, and thus the wind pressure increases. This avoids the wind pressure fluctuation caused by filter clogging, which would disrupt the resistance balance of the ventilation system, leading to insufficient airflow in some ducts and causing duct resonance. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall appearance structure of a centrifugal fan with noise reduction function for the lithium battery industry according to the present invention;

[0032] Figure 2 This invention relates to a centrifugal fan for the lithium battery industry with noise reduction function. Figure 1 Another perspective structural diagram;

[0033] Figure 3 This invention relates to a centrifugal fan for the lithium battery industry with noise reduction function. Figure 2 A partial enlarged view of the structure at point A in the middle;

[0034] Figure 4 This is a schematic diagram of the external structure of a cleaning unit of a centrifugal fan with noise reduction function for the lithium battery industry according to the present invention.

[0035] Figure 5 This invention relates to a centrifugal fan for the lithium battery industry with noise reduction function. Figure 4 A partial enlarged view of the structure at point B in the middle;

[0036] Figure 6 This invention relates to a centrifugal fan for the lithium battery industry with noise reduction function. Figure 4 Another perspective structural diagram;

[0037] Figure 7 This invention relates to a centrifugal fan for the lithium battery industry with noise reduction function. Figure 6 A partial enlarged view of the structure at point C;

[0038] Figure 8 This is a schematic diagram of the internal structure of a centrifugal fan for the lithium battery industry with noise reduction function according to the present invention.

[0039] Figure 9 This is a schematic diagram of the external structure of the spring cylinder, filter screen and deflector of a centrifugal fan with noise reduction function for the lithium battery industry according to the present invention.

[0040] Figure 10 This is a schematic diagram of the external structure of a partial drive unit of a centrifugal fan with noise reduction function for the lithium battery industry according to the present invention.

[0041] Figure 11 This invention relates to a centrifugal fan for the lithium battery industry with noise reduction function. Figure 10 A partial enlarged view of the structure at point D.

[0042] In the diagram: 1. Mounting bracket; 2. Shock absorption unit; 21. Connecting rod; 22. Sliding column; 23. Fixing bracket; 24. Clamping plate; 25. Upper arc-shaped spring; 26. Pull strap; 27. Lower arc-shaped spring; 3. Cleaning unit; 31. Stand; 32. Spring-loaded electric telescopic rod; 33. Sliding rod; 34. Moving block; 35. Conductive ring; 36. Conductive plate; 37. Insulating plate; 38. Long plate; 39. Slide groove; 310. Cylinder; 311. Sliding block; 312. Arc-shaped frame; 313. Scraper; 314. Bent rod; 15. Slot plate; 316. Spring-loaded electric push rod; 317. Toggle rod; 318. Spring cylinder; 319. Filter screen; 320. Toggle plate; 4. Noise reduction unit; 41. Rotating rod; 42. Silencing plate; 5. Drive unit; 51. Housing; 52. Guide plate; 53. Straight rod; 54. Drive motor; 55. Base; 56. Blade; 57. Mounting frame; 58. Round rod; 59. Rotating block; 510. Arc-shaped return spring; 511. Counterweight block; 512. Arc-shaped slide groove; 513. Baffle; 514. Pull rope. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example: Figures 1-11 As shown, the present invention provides a technical solution:

[0045] like Figure 1 , Figure 2 As shown, a centrifugal fan for the lithium battery industry with noise reduction function includes a mounting frame 1, a shock absorption unit 2, a cleaning unit 3, a noise reduction unit 4, and a drive unit 5. The mounting frame 1 is placed on a horizontal ground and a controller is installed on the mounting frame 1. The shock absorption unit 2 is fixedly connected to the drive unit 5 and has the function of reducing the vibration of the machine body. The cleaning unit 3 is fixedly connected to the mounting frame 1 and rotatably connected to the drive unit 5. The noise reduction unit 4 is fixedly connected to the drive unit 5, and the drive unit 5 is fixedly connected to the mounting frame 1.

[0046] Mounting bracket 1 is used for vibration damping unit 2, cleaning unit 3, noise reduction unit 4 and drive unit 5. Vibration damping unit 2 is used to reduce body vibration, cleaning unit 3 is used to clean filter plates to prevent increased wind resistance and reduced air volume, noise reduction unit 4 is used to reduce noise at the fan outlet, and drive unit 5 is used to provide power to the fan. During the operation of the centrifugal fan through drive unit 5, vibration damping unit 2 is used to dampen the body, cleaning unit 3 is used to clean filter plates to ensure ventilation and avoid dust pollution, and noise reduction unit 4 is used to reduce noise at the air outlet to ensure a good working environment.

[0047] like Figure 3 As shown, the damping unit 2 includes a connecting rod 21, a sliding column 22, a fixing frame 23, a clamping plate 24, an upper arc-shaped spring piece 25, a pull strap 26, and a lower arc-shaped spring piece 27. The connecting rod 21 has two slots. The connecting rod 21 and the sliding column 22 are slidably connected through a conductive ring on the connecting rod 21. The sliding column 22 is fixedly connected to the fixing frame 23. The fixing frame 23 is fixedly connected to the mounting frame 1. There are two clamping plates 24. The clamping plates 24 are fixedly installed on the connecting rod 21. The upper arc-shaped spring piece 25 is slidably connected to the slot of the connecting rod 21. The two ends of the upper arc-shaped spring piece 25 are slidably installed in the fixing frame 23. The two ends of the upper arc-shaped spring piece 25 are connected through the pull strap 26, which is located in the middle of the clamping plate 24. The two ends of the lower arc-shaped spring piece 27 are connected through the pull strap 26. The lower arc-shaped spring piece 27 is slidably connected to the slot of the connecting rod 21. The two ends of the lower arc-shaped spring piece 27 are slidably installed in the fixing frame 23.

[0048] When the centrifugal fan is operating, the housing 51 vibrates up and down. As the housing 51 moves downward, the connecting rod 21 moves downward along the sliding column 22. On one hand, the connecting rod 21 drives the clamping plate 24 to move downward, squeezing the lower pull strap 26 and stretching the two ends of the lower arc-shaped spring piece 27 closer together, increasing the upward arching distance of the lower arc-shaped spring piece 27. At this time, the arched part of the lower arc-shaped spring piece 27 pushes upward against the groove of the connecting rod 21, inhibiting the downward movement of the connecting rod 21, thereby suppressing the vibration of the housing 51. On the other hand, the conductive ring of the connecting rod 21 is always in contact with the drive coil on the cylinder 310. As the connecting rod 21 moves downward, the effective number of turns of the drive coil gradually decreases, the resistance decreases, and the current supplied to the spring-electric telescopic rod 32 increases, causing the spring-electric telescopic rod 32 to continuously extend. As the housing 51 moves upward, the connecting rod 21 moves upward along the sliding column 22. On the one hand, the connecting rod 21 drives the clamping plate 24 to move upward, squeezing the upper pull strap 26 and stretching the two ends of the upper arc-shaped spring piece 25 closer to each other, making the downward arching distance of the upper arc-shaped spring piece 25 larger. At this time, the arched part of the upper arc-shaped spring piece 25 pushes down to the groove of the connecting rod 21, inhibiting the upward movement of the connecting rod 21, thereby suppressing the vibration of the housing 51 and jointly achieving the shock absorption effect of the housing 51. On the other hand, the conductive ring of the connecting rod 21 is always in contact with the drive coil on the cylinder 310. As the connecting rod 21 moves upward, the effective number of turns of the drive coil gradually increases, the resistance increases, and the current supplied to the spring electric telescopic rod 32 decreases, so that the spring electric telescopic rod 32 continues to shorten under the action of its own restoring force.

[0049] like Figure 4 , Figure 5 As shown, the cleaning unit 3 includes a stand 31, a spring-loaded electric telescopic rod 32, a sliding rod 33, a moving block 34, a conductive ring 35, a conductive plate 36, and an insulating plate 37. The stand 31 is fixedly mounted on the mounting frame 1. The fixed end of the spring-loaded electric telescopic rod 32 is fixedly mounted on the stand 31. The spring-loaded electric telescopic rod 32 is fixedly connected to the moving block 34. The spring-loaded electric telescopic rod 32 is electrically connected to the conductive ring on the connecting rod 21. Both ends of the sliding rod 33 are fixedly connected to the stand 31. The moving block 34 is slidably connected to the stand 31. The conductive ring 35 is slidably mounted on the sliding rod 33. The conductive plate 36 is slidably connected to the sliding rod 33 and is fixedly mounted on one side of the moving block 34. The insulating plate 37 is slidably connected to the sliding rod 33 and is slidably connected to the sliding rod 33. The conductive ring 35 is located between the conductive plate 36 and the insulating plate 37.

[0050] like Figure 4 , Figure 6As shown, the cleaning unit 3 also includes a long plate 38, a chute 39, a cylinder 310, a slider 311, an arc frame 312, a scraper 313, and a bent rod 314. The long plate 38 is fixedly connected to the moving block 34, the chute 39 is slidably connected to the long plate 38, the chute 39 is fixedly connected to the cylinder 310, the cylinder 310 is rotatably connected to the slider 311, the slider 311 is slidably mounted on the arc frame 312, the arc frame 312 is fixedly connected to the upright frame 31, one end of the scraper 313 is fixedly connected to the slider 311, the other end of the scraper 313 is rotatably connected to the arc frame 312, and one end of the bent rod 314 is fixedly connected to the long plate 38.

[0051] like Figure 6 , Figure 7 As shown, the cleaning unit 3 also includes a trough plate 315, a spring-loaded electric push rod 316, a lever 317, a spring cylinder 318, a filter screen 319, and a dial plate 320. The other end of the bent rod 314 is fixedly connected to the trough plate 315. The fixed end of the spring-loaded electric push rod 316 is fixedly installed on the trough plate 315. The telescopic end of the spring-loaded electric push rod 316 is fixedly connected to the lever 317. The lever 317 is slidably connected to the trough plate 315. The spring cylinder 318 is fixedly connected to the filter screen 319. The dial plate 320 is fixedly connected to the spring cylinder 318. The spring-loaded electric push rod 316 is electrically connected to the conductive plate 36.

[0052] During the extension of the spring-powered telescopic rod 32, the moving block 34 slides to the right along the upright frame 31. At this time, the insulating plate 37 contacts the conductive ring 35 and does not supply power to the spring-powered push rod 316. The spring-powered push rod 316 remains in a retracted state and does not contact the lever plate 320. During the movement of the moving block 34 and the long plate 38 to the left, on the one hand, under the transmission action of the bent rod 314, the groove plate 315 moves synchronously to the left. On the other hand, under the transmission action of the cylinder 310, the sliding groove 39 drives the slider 311 to slide along the arc frame 312 from the left high point to the right high point. During this process, relative sliding occurs between the sliding groove 39 and the long plate 38. During the sliding of the slider 311, the scraper 313 swings around the arc frame 312, thereby cleaning the surface of the filter screen 319. During the retraction of the spring-powered telescopic rod 32, the moving block 34 slides to the left along the upright frame 31. At this time, the conductive plate 36 and the conductive ring Contact 35 allows the controller's current to supply power to the spring-driven electric push rod 316 through the conductive ring 35 and conductive plate 36. At this time, the spring-driven electric push rod 316 extends and pushes the lever 317 to slide upward along the slot plate 315. The lever plate 320 drives the spring cylinder 318 to rotate clockwise, causing the filter screen 319 to rotate clockwise synchronously. During the process of the moving block 34 driving the long plate 38 to move to the left, on the one hand, under the transmission action of the bent rod 314, the slot plate 315 moves synchronously to the left. On the other hand, under the transmission action of the cylinder 310, the sliding groove 39 drives the slider 311 to slide along the arc frame 312 from the high point on the right to the high point on the left. During the process, the sliding groove 39 and the long plate 38 slide relative to each other. During the sliding process, the slider 311 drives the scraper 313 to swing around the arc frame 312, thereby cleaning the surface of the filter screen 319 and removing the dust attached to the surface of the filter screen 319 to avoid the fan being blocked and affecting the air volume.

[0053] like Figure 1 As shown, the noise reduction unit 4 includes a rotating rod 41 and a sound-absorbing plate 42. The sound-absorbing plate 42 is rotatably connected to the rotating rod 41, and the sound-absorbing plate 42 is provided with sound-absorbing holes.

[0054] The gas discharged from the fan outlet is absorbed by the sound-absorbing plate 42, achieving a noise reduction effect and thus providing a good working environment.

[0055] like Figure 8 , Figure 10 , Figure 11As shown, the drive unit 5 includes a housing 51, a guide plate 52, a straight rod 53, a drive motor 54, a base 55, blades 56, a mounting frame 57, a round rod 58, a rotating block 59, an arc-shaped return spring 510, a counterweight 511, an arc-shaped slide groove 512, a baffle 513, and a pull rope 514. A connecting rod 21 is fixedly connected to the housing 51, and a spring cylinder 318 is rotatably connected to the housing 51. The guide plate 52 is installed inside the housing 51 and is fixedly connected to the housing 51 via a connecting rod. One end of the straight rod 53 is fixedly connected to the mounting frame 57, and the other end of the straight rod 53 passes through the housing 51 and is fixedly connected to the output end of the drive motor 54. The drive motor 54 has a fixed end... The blade 56 is fixedly installed on the base 55, which is fixedly connected to the mounting frame 1. The blade 56 is fixedly connected to the round rod 58, which is rotatably connected to the mounting frame 57. The rotating block 59 is fixedly installed on the round rod 58. A rectangular plate is provided on the rotating block 59. One end of the rotating block 59 is connected to the mounting frame 57 through an arc-shaped return spring 510, and the other end of the rotating block 59 is connected to the counterweight block 511 through a pull rope 514. The counterweight block 511 is slidably installed in the arc-shaped slide groove 512. The arc-shaped slide groove 512 is fixedly installed on the surface of the mounting frame 57 near the drive motor 54. The baffle 513 is fixedly connected to the straight rod 53, and the baffle 513 abuts against the counterweight block 511.

[0056] The controller starts the drive motor 54, which, under the transmission of the straight rod 53, drives the blades 56 on the mounting frame 57 to rotate, drawing outside air into the housing 51. At this time, the counterweight 511 moves outward along the arc-shaped slide 512 under the action of centrifugal force and the reaction force of the airflow and maintains its current position. When the filter 319 is blocked, causing the air intake to decrease, the reaction force of the airflow inside the housing 51 decreases. At this time, the centrifugal force on the counterweight 511 remains unchanged, and the counterweight 511 continues to move outward along the arc-shaped slide 512. Under the action of the self-restoring force of the arc-shaped return spring 510, it pulls the rotating block 59 to rotate, thereby driving the round rod 58 and the blades 56 to rotate synchronously, thereby increasing the outlet angle of the blades 56. The kinetic energy given to the airflow by the blades 56 increases, the outlet speed increases, and the wind pressure increases. This avoids the wind pressure fluctuation caused by the blockage of the filter 319, which would disrupt the resistance balance of the ventilation system and lead to insufficient airflow in some ducts and cause duct resonance.

[0057] like Figure 3 As shown, a drive coil is provided on the sliding column 22, and the end of the drive coil closest to the horizontal ground is the current input terminal.

[0058] In order to change the current supplied by the drive coil to the spring electric telescopic rod 32 during the vibration of the housing 51, the spring electric telescopic rod 32 will extend and retract, thereby driving the scraper 313 to clean the filter screen 319.

[0059] like Figure 6 ,Figure 9 As shown, the rotation speed of filter screen 319 is less than the rotation speed of scraper 313.

[0060] When the scraper 313 rotates at a higher speed, the high-speed scraper 313 uses shearing force to more thoroughly remove particles from the pores of the filter screen 319, avoiding residual clogging. At the same time, the rotation of the filter screen 319 is to prevent the area where the scraper 313 cleans the filter screen 319 from being fixed, which would prevent dust from being removed from other areas and affect the cleaning effect.

[0061] like Figure 1 As shown, the two ends of the rotating rod 41 are fixedly installed on the inner wall of the air outlet of the housing 51. In the vertical direction, the angle between the sound-absorbing plate 42 and the vertical axis is 30°-60°.

[0062] The outlet airflow of centrifugal fans usually has a high turbulence intensity. If the silencer plate 42 is perpendicular to the airflow direction, it will aggravate airflow separation and vortex generation, causing additional aerodynamic noise. The inclined silencer plate 42 can guide the airflow to transition smoothly along the plate surface and reduce turbulence.

[0063] Working principle of the invention:

[0064] When the centrifugal fan is operating, the housing 51 vibrates up and down. As the housing 51 moves downward, the connecting rod 21 moves downward along the sliding column 22. On one hand, the connecting rod 21 drives the clamping plate 24 to move downward, squeezing the lower pull strap 26 and stretching the two ends of the lower arc-shaped spring piece 27 closer together, increasing the upward arching distance of the lower arc-shaped spring piece 27. At this time, the arched part of the lower arc-shaped spring piece 27 pushes upward against the groove of the connecting rod 21, inhibiting the downward movement of the connecting rod 21, thereby suppressing the vibration of the housing 51. On the other hand, the conductive ring of the connecting rod 21 is always in contact with the drive coil on the cylinder 310. As the connecting rod 21 moves downward, the effective number of turns of the drive coil gradually decreases, the resistance decreases, and the current supplied to the spring-electric telescopic rod 32 increases, causing the spring-electric telescopic rod 32 to continuously extend. As the housing 51 moves upward, the connecting rod 21 moves upward along the sliding column 22. On the one hand, the connecting rod 21 drives the clamping plate 24 to move upward, squeezing the upper pull strap 26 and stretching the two ends of the upper arc-shaped spring piece 25 closer to each other, making the downward arching distance of the upper arc-shaped spring piece 25 larger. At this time, the arched part of the upper arc-shaped spring piece 25 pushes down to the groove of the connecting rod 21, inhibiting the upward movement of the connecting rod 21, thereby suppressing the vibration of the housing 51 and jointly achieving the shock absorption effect of the housing 51. On the other hand, the conductive ring of the connecting rod 21 is always in contact with the drive coil on the cylinder 310. As the connecting rod 21 moves upward, the effective number of turns of the drive coil gradually increases, the resistance increases, and the current supplied to the spring electric telescopic rod 32 decreases, so that the spring electric telescopic rod 32 continues to shorten under the action of its own restoring force.

[0065] During the extension of the spring-powered telescopic rod 32, the moving block 34 slides to the right along the upright frame 31. At this time, the insulating plate 37 contacts the conductive ring 35 and does not supply power to the spring-powered push rod 316. The spring-powered push rod 316 remains in a retracted state and does not contact the lever plate 320. During the movement of the moving block 34 and the long plate 38 to the left, on the one hand, under the transmission action of the bent rod 314, the groove plate 315 moves synchronously to the left. On the other hand, under the transmission action of the cylinder 310, the sliding groove 39 drives the slider 311 to slide along the arc frame 312 from the left high point to the right high point. During this process, relative sliding occurs between the sliding groove 39 and the long plate 38. During the sliding of the slider 311, the scraper 313 swings around the arc frame 312, thereby cleaning the surface of the filter screen 319. During the retraction of the spring-powered telescopic rod 32, the moving block 34 slides to the left along the upright frame 31. At this time, the conductive plate 36 and the conductive ring Contact 35 allows the controller's current to supply power to the spring-driven electric push rod 316 through the conductive ring 35 and conductive plate 36. At this time, the spring-driven electric push rod 316 extends and pushes the lever 317 to slide upward along the slot plate 315. The lever plate 320 drives the spring cylinder 318 to rotate clockwise, causing the filter screen 319 to rotate clockwise synchronously. During the process of the moving block 34 driving the long plate 38 to move to the left, on the one hand, under the transmission action of the bent rod 314, the slot plate 315 moves synchronously to the left. On the other hand, under the transmission action of the cylinder 310, the sliding groove 39 drives the slider 311 to slide along the arc frame 312 from the high point on the right to the high point on the left. During the process, the sliding groove 39 and the long plate 38 slide relative to each other. During the sliding process, the slider 311 drives the scraper 313 to swing around the arc frame 312, thereby cleaning the surface of the filter screen 319 and removing the dust attached to the surface of the filter screen 319 to avoid the fan being blocked and affecting the air volume.

[0066] The controller starts the drive motor 54, which, under the transmission of the straight rod 53, drives the blades 56 on the mounting frame 57 to rotate, drawing outside air into the housing 51. At this time, the counterweight 511 moves outward along the arc-shaped slide 512 under the action of centrifugal force and the reaction force of the airflow and maintains its current position. When the filter 319 is blocked, causing the air intake to decrease, the reaction force of the airflow inside the housing 51 decreases. At this time, the centrifugal force on the counterweight 511 remains unchanged, and the counterweight 511 continues to move outward along the arc-shaped slide 512. Under the action of the self-restoring force of the arc-shaped return spring 510, it pulls the rotating block 59 to rotate, thereby driving the round rod 58 and the blades 56 to rotate synchronously, thereby increasing the outlet angle of the blades 56. The kinetic energy given to the airflow by the blades 56 increases, the outlet speed increases, and the wind pressure increases. This avoids the wind pressure fluctuation caused by the blockage of the filter 319, which would disrupt the resistance balance of the ventilation system and lead to insufficient airflow in some ducts and cause duct resonance.

[0067] The gas discharged from the fan outlet is absorbed by the sound-absorbing plate 42, achieving a noise reduction effect and thus providing a good working environment.

[0068] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A centrifugal fan for the lithium battery industry with noise reduction function, characterized in that: The centrifugal fan for the lithium battery industry with noise reduction function includes a mounting frame (1), a shock absorption unit (2), a cleaning unit (3), a noise reduction unit (4), and a drive unit (5). The mounting frame (1) is placed on a horizontal ground and a controller is provided on the mounting frame (1). The shock absorption unit (2) is fixedly connected to the drive unit (5) and has the function of reducing the vibration of the machine body. The cleaning unit (3) is fixedly connected to the mounting frame (1) and rotatably connected to the drive unit (5). The noise reduction unit (4) is fixedly connected to the drive unit (5) and the drive unit (5) is fixedly connected to the mounting frame (1). The shock absorption unit (2) includes a connecting rod (21), a sliding column (22), a fixing frame (23), a clamping plate (24), an upper arc-shaped spring piece (25), a pull strap (26), and a lower arc-shaped spring piece (27). The connecting rod (21) has two slots. The connecting rod (21) and the sliding column (22) are slidably connected through a conductive ring on the connecting rod (21). The sliding column (22) is fixedly connected to the fixing frame (23). The fixing frame (23) is fixedly connected to the mounting frame (1). There are two clamping plates (24). The clamping plates (24) are fixed. Installed on the connecting rod (21), the upper arc-shaped spring piece (25) is slidably connected to the groove of the connecting rod (21), and both ends of the upper arc-shaped spring piece (25) are slidably installed in the fixed frame (23). The two ends of the upper arc-shaped spring piece (25) are connected by a pull strap (26), and the pull strap (26) is located in the middle of the clamping plate (24). The two ends of the lower arc-shaped spring piece (27) are connected by a pull strap (26), and the lower arc-shaped spring piece (27) is slidably connected to the groove of the connecting rod (21). The two ends of the lower arc-shaped spring piece (27) are slidably installed in the fixed frame (23). The cleaning unit (3) includes a stand (31), a spring-loaded electric telescopic rod (32), a slide rod (33), a moving block (34), a conductive ring (35), a conductive plate (36), and an insulating plate (37). The stand (31) is fixedly mounted on the mounting frame (1). The fixed end of the spring-loaded electric telescopic rod (32) is fixedly mounted on the stand (31). The spring-loaded electric telescopic rod (32) is fixedly connected to the moving block (34). The spring-loaded electric telescopic rod (32) is connected to the connecting rod (21). The conductive ring is electrically connected, the two ends of the slide rod (33) are fixedly connected to the upright (31), the moving block (34) is slidably connected to the upright (31), the conductive ring (35) is slidably installed on the slide rod (33), the conductive plate (36) is slidably connected to the slide rod (33), the conductive plate (36) is fixedly installed on one side of the moving block (34), the insulating plate (37) is slidably connected to the slide rod (33), and the conductive ring (35) is located between the conductive plate (36) and the insulating plate (37). The cleaning unit (3) further includes a long plate (38), a chute (39), a cylinder (310), a slider (311), an arc frame (312), a scraper (313), and a bent rod (314). The long plate (38) is fixedly connected to the moving block (34), the chute (39) is slidably connected to the long plate (38), the chute (39) is fixedly connected to the cylinder (310), the cylinder (310) is rotatably connected to the slider (311), the slider (311) is slidably mounted on the arc frame (312), the arc frame (312) is fixedly connected to the upright frame (31), one end of the scraper (313) is fixedly connected to the slider (311), the other end of the scraper (313) is rotatably connected to the arc frame (312), and one end of the bent rod (314) is fixedly connected to the long plate (38). The cleaning unit (3) also includes a trough plate (315), a spring electric push rod (316), a lever (317), a spring cylinder (318), a filter screen (319), and a lever plate (320). The other end of the bent rod (314) is fixedly connected to the trough plate (315). The fixed end of the spring electric push rod (316) is fixedly installed on the trough plate (315). The telescopic end of the spring electric push rod (316) is fixedly connected to the lever (317). The lever (317) is slidably connected to the trough plate (315). The spring cylinder (318) is fixedly connected to the filter screen (319). The lever plate (320) is fixedly connected to the spring cylinder (318). The spring electric push rod (316) is electrically connected to the conductive plate (36). The noise reduction unit (4) includes a rotating rod (41) and a sound-absorbing plate (42). The sound-absorbing plate (42) is rotatably connected to the rotating rod (41), and the sound-absorbing plate (42) is provided with sound-absorbing holes. The drive unit (5) includes a housing (51), a guide plate (52), a straight rod (53), a drive motor (54), a base (55), blades (56), a mounting frame (57), a round rod (58), a rotating block (59), an arc-shaped return spring (510), a counterweight (511), an arc-shaped slide (512), a baffle (513), and a pull rope (514). The connecting rod (21) is fixedly connected to the housing (51), and the spring cylinder (318) is rotatably connected to the housing (51). The guide plate (52) is installed inside the housing (51) and is fixedly connected to the housing (51) via a connecting rod. One end of the straight rod (53) is fixedly connected to the mounting frame (57), and the other end of the straight rod (53) passes through the housing (51) and is fixedly connected to the output end of the drive motor (54). The fixed end of the drive motor (54) The blade (56) is fixedly installed on the base (55), which is fixedly connected to the mounting frame (1). The blade (56) is fixedly connected to the round rod (58), which is rotatably connected to the mounting frame (57). The rotating block (59) is fixedly installed on the round rod (58). A rectangular plate is provided on the rotating block (59). One end of the rotating block (59) is connected to the mounting frame (57) through an arc-shaped return spring (510). The other end of the rotating block (59) is connected to the counterweight (511) through a pull rope (514). The counterweight (511) is slidably installed in the arc-shaped slide groove (512). The arc-shaped slide groove (512) is fixedly installed on the surface of the mounting frame (57) near the drive motor (54). The baffle (513) is fixedly connected to the straight rod (53), and the baffle (513) abuts against the counterweight (511).

2. A centrifugal fan with noise reduction function for the lithium battery industry according to claim 1, characterized in that: A drive coil is provided on the sliding column (22), and the end of the drive coil closest to the horizontal ground is the current input terminal.

3. A centrifugal fan with noise reduction function for the lithium battery industry according to claim 1, characterized in that: The rotation speed of the filter screen (319) is less than that of the scraper (313).

4. A centrifugal fan with noise reduction function for the lithium battery industry according to claim 1, characterized in that: The two ends of the rotating rod (41) are fixedly installed on the inner wall of the air outlet of the housing (51). In the vertical direction, the included angle between the sound-absorbing plate (42) and the vertical axis is 30°-60°.

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