A low noise axial flow fan
By setting up a rubber diaphragm, sound-absorbing plate and porous sound-absorbing cover in the axial flow fan, combined with the design of shock absorbers and counterweight plates, the noise and vibration problems during operation of the axial flow fan are solved, achieving low noise and easy movement effects.
Patent Information
- Application Number
- CN202411744117.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-30
- Publication Date
- 2025-04-01
AI Technical Summary
During operation, the existing axial flow fans are affected by the vibration of the driving motor and the airflow noise, which makes it inconvenient to carry the equipment.
A low-noise axial flow fan is designed. By setting up a rubber diaphragm in the shell, installing a sound absorbing plate on both sides of the impeller, and setting a porous sound absorbing cover on one side of the impeller, combining the design of the shock absorber and counterweight plate, it effectively reduces noise and vibration.
It effectively reduces noise levels, reduces the impact on the surrounding environment, extends the service life of the equipment, and facilitates the movement and use of the device through the design of the universal wheel.
Smart Images
Figure CN119737328A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of axial flow fans, and in particular to a low-noise axial flow fan. Background Art
[0002] Axial flow fan is a special fluid machine, mainly used for local ventilation. It is easy to install, has obvious ventilation effect and is safe. It can be connected to a wind pipe to deliver wind to a designated area. Its working principle is to use the rotation of the impeller to push the gas to flow along the axial direction, thereby achieving the effect of ventilation. The cross-section of the axial flow fan is generally a wing section. The blades can be fixed in position or rotate around their longitudinal axis. The angle between the blades and the airflow or the blade spacing can be fixed or adjustable.
[0003] In the prior art, during the use of an axial flow fan, the impeller and the drive motor of the axial flow fan are installed inside the fan casing. Since the fan casing is a thin-walled structure and the axial flow fan has a large ventilation volume, when the axial flow fan is working, the vibration generated by the drive motor is transmitted to the fan casing, causing the fan casing to vibrate, thereby causing vibration noise, and when the airflow passes through the inside of the fan casing, wind noise is also caused due to the airflow effect. The noise generated by the operation of the axial flow fan will cause environmental noise, thereby affecting the health and efficiency of the staff. In addition, general axial flow fans are relatively large, and often require multiple people to lift and transport them during transportation, thereby reducing the practicality of the entire device. For this reason, the present invention proposes a low-noise axial flow fan for solving the above problems. Summary of the invention
[0004] The object of the present invention is to provide a low-noise axial flow fan to solve the problems raised in the above background technology.
[0005] To achieve the above object, the present invention provides the following technical solution: a low-noise axial flow fan, comprising: The shell has a driving motor arranged in it, an impeller is arranged on a fixed sleeve at the output end of the driving motor, sound absorbing panels are arranged on both sides of the impeller, and a porous sound absorbing cover is installed on one side of the sound absorbing panel.
[0006] A shock absorber is arranged at the lower side of the porous sound-absorbing cover, the bottom of the shock absorber is fixedly connected to the counterweight plate, a controller is fixedly installed at one side of the counterweight plate, and a universal wheel is arranged at the lower side of the controller.
[0007] Preferably, a rubber vibration isolation membrane is fixedly connected to the inner ring surface of the shell, a mesh cover is fixedly connected to one side of the shell, a fixing plate is fixedly connected to one side of the sound absorbing board, the outer ring surface of the fixing plate is fixedly connected to the rubber vibration isolation membrane, mounting holes are provided on the surfaces of the fixing plate and the sound absorbing board, the mounting holes are arranged in a circular array, and a punched silencer mesh cylinder is fixedly provided in the mounting hole.
[0008] Preferably, a limiting sleeve is provided on one end of the driving motor, the outer ring of the limiting sleeve is fixedly connected to one end of the support rod, the other end of the support rod passes through the rubber vibration isolation membrane and is fixedly connected to the inner ring surface of the shell, four support rods are provided and arranged in a circular array about the outer ring surface of the limiting sleeve, and the fixed sleeve on the outer ring surface of the support rod is provided with a shock-absorbing rubber sleeve.
[0009] Preferably, one side of the porous sound-absorbing cover is fixedly connected to one side of the connecting sleeve, the connecting sleeve is slidingly sleeved on the outer ring surface of the shell, and the other side of the connecting sleeve is fixedly connected to a connecting block, and a socket is provided on the surface of the connecting block.
[0010] Preferably, an insertion rod is inserted into the socket, and the socket and the insertion rod are slidingly connected, one end of the insertion rod is fixedly connected to the pressure rod, both ends of the pressure rod are fixedly connected to one end of the tension spring, and the other end of the tension spring is fixedly connected to the outer ring surface of the shell.
[0011] Preferably, a connecting plate is provided on the lower side of the tension spring, one end of the connecting plate is fixedly connected to the outer ring surface of the shell, the lower surface of the connecting plate abuts against the upper surface of the shock absorber, and four shock absorbers are provided and are arranged symmetrically in pairs about the central plane of the counterweight plate.
[0012] Preferably, a groove is provided on the lower surface of the counterweight plate, the top of the universal wheel is fixedly connected to the connecting platform, the upper surface of the connecting platform is fixedly connected to one end of the large spring, the other end of the large spring is fixedly connected to the inner wall of the groove, and slots are provided on both sides of the connecting platform, and blocks are slidably inserted in the slots.
[0013] Preferably, a slide groove is provided inside the counterweight plate, and a clamping block is slidably installed in the slide groove. One side of the clamping block is fixedly connected to one end of a small spring, and the other end of the small spring is fixedly connected to the inner wall of the slide groove.
[0014] Preferably, a pull rod is fixedly connected to one side of the block, a limiting groove is provided on the side wall of the counterweight plate, the pull rod is sleeved in the limiting groove, and the pull rod and the limiting groove are slidably connected, and the controller is electrically connected to the drive motor.
[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. When the vibration generated by the driving motor is working, it is transmitted from the limit sleeve to the support rod. The fixed sleeve on the support rod is provided with a shock-absorbing rubber sleeve, so that the vibration transmitted to the support rod can be reduced. When the vibration is transmitted to the shell through the support rod, the inner ring surface of the shell is fixedly connected with a rubber vibration isolation membrane, and the vibration is further isolated by the provided rubber vibration isolation membrane, thereby reducing noise, thereby reducing the impact on the surrounding environment and extending the service life of the equipment. When the impeller rotates, noise will be generated between the gap between the inner ring surface of the shell, so that part of the noise can be absorbed by the sound-absorbing panels provided on both sides of the impeller. At the same time, the fixed plate and the fixed sleeve in the sound-absorbing panel are provided with a punched silencer mesh tube, which can also collect the generated noise and reduce the volume of the noise propagating outward, thereby effectively reducing the environmental noise. Finally, through the porous sound-absorbing cover provided on one side of the impeller, after the noise enters the small hole, it will be reflected on the inner wall of the sponge structure until most of the energy of the sound wave is consumed, thereby further reducing the noise and reducing the spread of noise, improving the noise reduction effect of the entire device, reducing noise pollution, reducing the impact on the production and life of personnel, ensuring the health of the operator, and thus improving work efficiency.
[0016] 2. The operator first lifts the counterweight plate, and then pulls the two pull rods in the back direction to make the pull rods drive the block to move, and then pulls out the universal wheel from the groove to make the slot of the connecting platform level with the slide groove. At this time, release the pull rod, and the pull rod slides in the slide groove toward the connecting platform under the elastic force of the small spring until the block is inserted into the slot, thereby limiting the connecting platform and then limiting the universal wheel, so that it is convenient to push the counterweight plate and move the entire device under the rolling action of the universal wheel. When the universal wheel needs to be retracted, pull the pull rod again to make the block slide out of the slot, and the connecting platform is driven to move into the groove under the pulling force of the large spring, so that the universal wheel enters the groove, and then the universal wheel is recovered, so that the bottom of the counterweight plate is flat, which is convenient for subsequent use, thereby improving the practicality of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the back side of the overall structure of the present invention; Figure 3 It is a bottom view schematic diagram of the overall structure of the present invention; Figure 4 It is a schematic diagram of the internal structure of the present invention; Figure 5 It is a bottom view schematic diagram of the internal structure of the present invention; Figure 6 It is a schematic side view of the internal structure of the present invention.
[0018] In the figure: 1. shell; 2. driving motor; 3. impeller; 4. sound absorbing board; 5. porous sound absorbing cover; 6. shock absorber; 7. counterweight plate; 8. controller; 9. universal wheel; 10. rubber vibration isolation membrane; 11. mesh cover; 12. fixing plate; 13. mounting hole; 14. punching sound-absorbing mesh tube; 15. limiting sleeve; 16. supporting rod; 17. shock-absorbing rubber sleeve; 18. connecting sleeve; 19. connecting block; 20. jack; 21. plug rod; 22. pressure rod; 23. tension spring; 24. connecting plate; 25. groove; 26. connecting platform; 27. large spring; 28. clamping block; 29. slide groove; 30. small spring; 31. pull rod; 32. limiting groove; 33. clamping groove. DETAILED DESCRIPTION
[0019] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0020] In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0022] For the purpose of simplicity and illustration, the principles of the embodiments are mainly described by reference to examples. In the following description, many specific details are proposed to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, known methods and structures are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments can be used in combination with each other.
[0023] See also Figures 1 to 6The present invention provides a technical solution: a low-noise axial flow fan, comprising: a shell 1, a driving motor 2 is arranged in the shell 1, an impeller 3 is fixedly sleeved at the output end of the driving motor 2, sound absorbing panels 4 are arranged on both sides of the impeller 3, and a porous sound absorbing cover 5 is installed on one side of the sound absorbing panel 4, the shell 1 provides stable support for the driving motor 2 and the impeller 3, and the driving motor 2 drives the impeller 3 fixedly connected to its output end to rotate, sound absorbing panels 4 are arranged on both sides of the impeller 3, and the noise generated when the axial flow fan is working can be collected, and the porous sound absorbing cover 5 arranged on one side of the sound absorbing panel 4 can reduce the diffusion of noise, a rubber vibration isolation membrane 10 is fixedly connected to the inner ring surface of the shell 1, a mesh cover 11 is fixedly connected to one side of the shell 1, and a fixed plate 12 is fixedly connected to one side of the sound absorbing panel 4 The outer ring surface of the fixing plate 12 is fixedly connected to the rubber vibration isolation membrane 10. The fixing plate 12 and the sound absorbing board 4 are provided with mounting holes 13. The mounting holes 13 are arranged in a circular array. A punched sound-absorbing mesh tube 14 is fixedly sleeved in the mounting hole 13. The rubber vibration isolation membrane 10 fixedly connected to the inner wall of the shell 1 can reduce the vibration force generated when the driving motor 2 is working and transmitted to the shell 1, thereby reducing the vibration frequency of the entire device. The mesh cover 11 is fixedly installed on one side of the shell 1 to reduce the flying of debris. The fixing plate 12 is arranged on both sides of the impeller 3. The fixing plate 12 is fixedly connected to the sound absorbing board 4. The mounting holes 13 opened on the surface of the fixing plate 12 and the sound absorbing board 4 facilitate the fixed installation of the punched sound-absorbing mesh tube 14. The punched sound-absorbing mesh tube 14 can reduce noise. In order to prevent the diffusion of sound, a limit sleeve 15 is fixedly provided at one end of the driving motor 2, and the outer ring of the limit sleeve 15 is fixedly connected to one end of the support rod 16, and the other end of the support rod 16 passes through the rubber vibration isolation membrane 10 and is fixedly connected to the inner ring surface of the shell 1. Four support rods 16 are provided and arranged in a circular array about the outer ring surface of the limit sleeve 15. A shock-absorbing rubber sleeve 17 is fixedly provided on the outer ring surface of the support rod 16. The driving motor 2 is fixedly supported by the fixed connection among the limit sleeve 15, the support rod 16 and the shell 1. The shock-absorbing rubber sleeve 17 fixedly provided on the outer ring surface of the support rod 16 can reduce the vibration force of the driving motor 2 during fighting. One side of the porous sound-absorbing cover 5 is fixedly connected to one side of the connecting sleeve 18. The connecting sleeve 18 is slidably sleeved on the outer ring surface of the shell 1, and the other side of the connecting sleeve 18 A connecting block 19 is fixedly connected, and a socket 20 is provided on the surface of the connecting block 19. The connecting sleeve 18 is slidably sleeved on one side of the shell 1, so that the porous sound-absorbing cover 5 is close to the side of the impeller 3, which is conducive to slowing down the propagation of noise. The setting of the connecting block 19 facilitates the fixing of the connecting sleeve 18 on the outer ring surface of the shell 1. A plug rod 21 is inserted in the socket 20 and is slidably connected to the plug rod 21. One end of the plug rod 21 is fixedly connected to the pressure rod 22, and both ends of the pressure rod 22 are fixedly connected to one end of the tension spring 23. The other end of the tension spring 23 is fixedly connected to the outer ring surface of the shell 1. The tension spring 23 always pulls the pressure rod 22 close to the outer ring of the shell 1, so that the plug rod 21 is always inserted in the socket 20 provided in the connecting block 19, thereby limiting and fixing the connecting sleeve 18.Then, the porous sound absorbing cover 5 is fixedly installed on the side of the housing 1 close to the impeller 3.
[0024] The drive motor 2 is fixedly installed in the limit sleeve 15. Since the limit sleeve 15, the support rod 16 and the housing 1 are fixedly connected, the drive motor 2 is fixed inside the housing 1. The impeller 3 is fixedly sleeved on the output end of the drive motor 2, and then the connecting sleeve 18 is slidably sleeved on the side of the housing 1 close to the impeller 3. At this time, the pressure rod 22 is pulled away from the outer ring surface of the housing 1, so that the pressure rod 22 drives the insertion rod 21 to move outward, so that the insertion rod 21 is aligned with the socket 20, and the pressure rod 22 is released. Under the tension of the tension spring 23, the insertion rod 21 is slidably inserted into the socket 20. , and the pulling direction of the tension spring 23 is always pulled in the axial direction of the shell 1, so that the insertion rod 21 can be stably inserted into the insertion hole 20, so that the insertion rod 21 limits the connection block 19, and then the connection block 19 limits the connection sleeve 18, so that the porous sound-absorbing cover 5 is fixedly installed on one side of the shell 1, thereby realizing the convenient installation and disassembly of the porous sound-absorbing cover 5. At this time, the driving motor 2 can be started to rotate by the controller 8, so that the driving motor 2 drives the impeller 3 to rotate. The vibration generated when the driving motor 2 is working is transmitted from the limiting sleeve 15 to the support rod 16, supporting A damping rubber sleeve 17 is provided on the fixed sleeve of the rod 16, so that the vibration transmitted to the support rod 16 can be reduced. When the vibration is transmitted to the housing 1 through the support rod 16, the inner ring surface of the housing 1 is fixedly connected with a rubber vibration isolation membrane 10, and the vibration is further isolated by the provided rubber vibration isolation membrane 10, thereby reducing noise, thereby reducing the impact on the surrounding environment and extending the service life of the equipment. When the impeller 3 rotates, noise is generated between the gap with the inner ring surface of the housing 1, so that part of the noise can be absorbed by the sound absorbing panels 4 provided on both sides of the impeller 3, and at the same time, the fixed plate 12 and the absorption panel 4 are provided. The sound board 4 is fixed with a punched silencer mesh tube 14 which can also collect the noise generated and reduce the volume of the noise propagating outward, thereby effectively reducing the environmental noise. Finally, the porous sound-absorbing cover 5 arranged on one side of the impeller 3 allows the noise to enter the small hole and then be reflected on the inner wall of the sponge-like structure until most of the energy of the sound wave is consumed, thereby further reducing the noise and the spread of the noise, improving the noise reduction effect of the entire device, reducing noise pollution, reducing the impact on the production and life of personnel, ensuring the health of the operators, and thus improving work efficiency.
[0025] A shock absorber 6 is arranged on the lower side of the porous sound-absorbing cover 5, and the bottom of the shock absorber 6 is fixedly connected to the counterweight plate 7, a controller 8 is fixedly installed on one side of the counterweight plate 7, and a universal wheel 9 is arranged on the lower side of the controller 8. The shock absorber 6 is fixedly installed on the upper surface of the counterweight plate 7, and the controller 8 is fixedly installed on one side of the counterweight plate 7, so as to facilitate the control of the start and stop of the drive motor 2. The universal wheel 9 is installed on the lower side of the counterweight plate 7, so as to facilitate the operation of the entire device. A connecting plate 24 is arranged on the lower side of the tension spring 23, and one end of the connecting plate 24 is fixedly connected to the outer ring surface of the shell 1, and the lower surface of the connecting plate 24 abuts against the upper surface of the shock absorber 6. Four shock absorbers 6 are arranged symmetrically about the central plane of the counterweight plate 7 in pairs, and the connecting plate 24 is connected to the upper surface of the shock absorber 6. The connecting plate 24 is fixedly installed at the bottom of the shell 1. The connecting plate 24 is sleeved on the limit bolts on the shock absorber 6 and then locked by the locking nut, so that the connecting plate 24 is fixedly installed on the upper surface of the shock absorber 6. The weight plate 7 is heavy, which can increase the stability of the entire device, reduce the jitter of the entire device, and thus reduce noise. A groove 25 is provided on the lower surface of the weight plate 7. The top of the universal wheel 9 is fixedly connected to the connecting platform 26. The upper surface of the connecting platform 26 is fixedly connected to one end of the large spring 27. The other end of the large spring 27 is fixedly connected to the inner wall of the groove 25. Slots 33 are provided on both sides of the connecting platform 26. A block 28 is slidably inserted in the slot 33. The lower surface of the weight plate 7 The groove 25 opened on the surface is convenient for storing the universal wheel 9. The top of the universal wheel 9 is fixedly connected to the connecting platform 26. The connecting platform 26 and the groove 25 are fixedly connected by a large spring 27. The pulling force of the large spring 27 is always toward the inside of the groove 25, so that the universal wheel 9 can be pulled into the inside of the groove 25, so that the bottom of the counterweight plate 7 can be flat. Slots 33 are opened on both sides of the connecting platform 26 to facilitate the clamping of the clamping block 28. A slide groove 29 is opened inside the counterweight plate 7. The clamping block 28 is slidably installed in the slide groove 29. One side of the clamping block 28 is fixedly connected to one end of the small spring 30, and the other end of the small spring 30 is fixedly connected to the inner wall of the slide groove 29. One end of the clamping block 28 is slidably plugged into the clamping groove 33 The other end of the block 28 is fixedly connected to the inner wall of the slide groove 29 by a small spring 30. The elastic direction of the small spring 30 always pops out in the direction close to the connecting platform 26. The block 28 is slidably installed in the slide groove 29. A pull rod 31 is fixedly connected to one side of the block 28. A limiting groove 32 is provided on the side wall of the counterweight plate 7. The pull rod 31 is sleeved in the limiting groove 32 and slidably connected to the limiting groove 32. The controller 8 is electrically connected to the drive motor 2. One side of the block 28 is fixedly connected to the pull rod 31, and the pull rod 31 is slidably sleeved in the limiting groove 32, so that the limiting groove 32 limits the pull rod 31, so that it is convenient to control the block 28 to slide in the slide groove 29 by pulling the pull rod 31.
[0026] Through the fixed connection between the shell 1, the connecting plate 24, and the shock absorber 6, the shock absorber 6 can reduce the overall vibration of the shell 1, thereby reducing the generation of noise and improving the stability of the entire device. When the entire device needs to be transported, the operator first lifts the counterweight plate 7, first pulls the two pull rods 31 in the back direction, so that the pull rods 31 drive the block 28 to move, and then pulls out the universal wheel 9 from the groove 25 to make the groove 33 of the connecting platform 26 level with the slide groove 29. At this time, the pull rod 31 is released, and the pull rod 31 moves closer to the connecting platform 26 in the slide groove 29 under the elastic force of the small spring 30. , until the block 28 is inserted into the slot 33, thereby limiting the connection platform 26, and then limiting the universal wheel 9, so that it is convenient to push the counterweight plate 7, and under the rolling action of the universal wheel 9, the movement of the entire device is facilitated. When the universal wheel 9 needs to be retracted, the pull rod 31 is pulled again to make the block 28 slide out of the slot 33, and the connection platform 26 is driven to move into the groove 25 under the pulling force of the large spring 27, so that the universal wheel 9 enters the groove 25, and then the universal wheel 9 is recovered, so that the bottom of the counterweight plate 7 is flat, which is convenient for subsequent use, thereby improving the practicality of the entire device.
[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A low-noise axial flow fan, comprising a housing (1), characterized in that: A driving motor (2) is arranged in the housing (1); an impeller (3) is arranged on a fixed sleeve at the output end of the driving motor (2); sound absorbing panels (4) are arranged on both sides of the impeller (3); and a porous sound absorbing cover (5) is installed on one side of the sound absorbing panel (4); A shock absorber (6) is arranged at the lower side of the porous sound absorbing cover (5); the bottom of the shock absorber (6) is fixedly connected to the counterweight plate (7); a controller (8) is fixedly mounted on one side of the counterweight plate (7); and a universal wheel (9) is arranged at the lower side of the controller (8).
2. A low-noise axial flow fan according to claim 1, characterized in that: The inner ring surface of the shell (1) is fixedly connected to a rubber vibration isolation membrane (10), one side of the shell (1) is fixedly connected to a mesh cover (11), one side of the sound absorbing panel (4) is fixedly connected to a fixing plate (12), the outer ring surface of the fixing plate (12) is fixedly connected to the rubber vibration isolation membrane (10), the fixing plate (12) and the sound absorbing panel (4) are provided with mounting holes (13) on their surfaces, the mounting holes (13) are arranged in a circular array, and a punched sound-absorbing mesh cylinder (14) is fixedly sleeved inside the mounting holes (13).
3. A low-noise axial flow fan according to claim 2, characterized in that: A fixed sleeve at one end of the driving motor (2) is provided with a limit sleeve (15); the outer ring of the limit sleeve (15) is fixedly connected to one end of a support rod (16); the other end of the support rod (16) penetrates the rubber vibration isolation membrane (10) and is fixedly connected to the inner ring surface of the housing (1); four support rods (16) are provided and arranged in a circular array about the outer ring surface of the limit sleeve (15); and a shock-absorbing rubber sleeve (17) is provided on the fixed sleeve of the outer ring surface of the support rod (16).
4. A low-noise axial flow fan according to claim 3, characterized in that: One side of the porous sound absorbing cover (5) is fixedly connected to one side of a connecting sleeve (18), the connecting sleeve (18) is slidably mounted on the outer ring surface of the housing (1), and the other side of the connecting sleeve (18) is fixedly connected to a connecting block (19), and a plug hole (20) is provided on the surface of the connecting block (19).
5. A low-noise axial flow fan according to claim 4, characterized in that: An insertion rod (21) is inserted into the insertion hole (20), and the insertion hole (20) and the insertion rod (21) are slidably connected, one end of the insertion rod (21) is fixedly connected to a pressure rod (22), both ends of the pressure rod (22) are fixedly connected to one end of a tension spring (23), and the other end of the tension spring (23) is fixedly connected to the outer ring surface of the housing (1).
6. A low-noise axial flow fan according to claim 5, characterized in that: A connecting plate (24) is provided on the lower side of the tension spring (23), one end of the connecting plate (24) is fixedly connected to the outer ring surface of the housing (1), the lower surface of the connecting plate (24) is in contact with the upper surface of the shock absorber (6), and four shock absorbers (6) are provided and are arranged symmetrically in pairs about the central plane of the counterweight plate (7).
7. A low-noise axial flow fan according to claim 6, characterized in that: The counterweight plate (7) has a groove (25) on its lower surface, the top of the universal wheel (9) is fixedly connected to the connecting platform (26), the upper surface of the connecting platform (26) is fixedly connected to one end of a large spring (27), the other end of the large spring (27) is fixedly connected to the inner wall of the groove (25), and the connecting platform (26) has slots (33) on both sides, and a block (28) is slidably inserted in the slot (33).
8. A low-noise axial flow fan according to claim 7, characterized in that: A slide groove (29) is provided inside the counterweight plate (7), and a clamping block (28) is slidably installed in the slide groove (29). One side of the clamping block (28) is fixedly connected to one end of a small spring (30), and the other end of the small spring (30) is fixedly connected to the inner wall of the slide groove (29).
9. A low-noise axial flow fan according to claim 8, characterized in that: A pull rod (31) is fixedly connected to one side of the clamping block (28), a limiting groove (32) is provided on the side wall of the counterweight plate (7), the pull rod (31) is sleeved in the limiting groove (32), and the pull rod (31) and the limiting groove (32) are slidably connected, and the controller (8) and the drive motor (2) are electrically connected.