Damping device for a fan

Abstract

The utility model discloses a damping device for fan, including sleeve piece, pivot piece and elastic damping part, one of sleeve piece and pivot piece is installed on the fan head of fan, and the other is installed on the support of fan, and elastic damping part is sleeved on pivot piece, and sleeve piece is assembled to the outer periphery of pivot piece and elastic damping part, after three of sleeve piece, pivot piece and elastic damping part are assembled, and elastic damping part is extruded between sleeve piece and pivot piece and forms the interference fit. The utility model can reduce the influence of unstable external force factor or vibration to a greater extent, makes the gear meshing operation in the fan more stable, avoids the jamming phenomenon of fan in the up and down head shaking process, and can effectively restrain the generation of transmission abnormal sound, improves the operation reliability of fan product, and improves user experience, and the damping device is simple and reliable in structure, and the cost is low, and the production manufacturing process is simple and controllable, greatly reduces the bad risk, and can be widely applied in fan product.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a damping device for a fan. Background Technology

[0002] In existing fan technology, the automatic oscillation function of the fan head in multiple angles (up, down, left, and right) is generally achieved through motor and gear transmission. With the development of technology, users can also control the fan remotely via remote control or Wi-Fi, which greatly improves the user experience.

[0003] However, in actual use, the following situation often occurs: In the gear transmission scheme of the fan head oscillating up and down, gears are provided on both sides of the support and the fan head (also known as the air supply part). The gears need to maintain a meshing clearance to avoid the phenomenon of gear jamming or failure to mesh properly. However, at the same time, during the process of the fan head oscillating around the axis of the support, the center of gravity of the fan head will change relative to the axis of the support. The stability of gear meshing varies, and there is a risk of easy separation and disassembly, resulting in jamming and abnormal noise. Especially when the gravitational torque is the main load torque and its direction changes, that is, when there is a clockwise and counterclockwise conversion relative to the axis of rotation, the gear meshing clearance will aggravate the jamming or abnormal noise of the fan head.

[0004] To overcome the aforementioned problems, existing commercially available fans generally add a counterweight at a certain position on the fan head to change the center of gravity of the fan head, ensuring that the gravitational torque always maintains a uniform direction and avoiding the conversion between clockwise and counterclockwise directions relative to the rotation axis. However, this solution requires adding a counterweight, which not only increases the manufacturing cost of the fan but also increases the overall weight and structural complexity of the fan, hindering the market promotion of the fan product. To address this, some manufacturers have added a torsion spring at the connection between the fan head and the support (as in the invention application with publication number CN107208651A), using the torsion spring to apply elastic pressure to the fan head in the opposite direction of rotation to improve the aforementioned technical problems. However, in practical applications, because the torsion spring undergoes torsional deformation during rotation, there is still a significant risk of abnormal noise. Furthermore, the resistance of the torsion spring during torsional deformation varies, making the structure relatively unstable. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a damping device for a fan. This damping device has a simple structure and can form a stable connection between the fan head and the support, effectively preventing the fan from jamming during oscillation and suppressing abnormal noise.

[0006] The technical solution of this utility model is as follows: a damping device for a fan, comprising a sleeve, a rotating shaft, and an elastic damping component. One of the sleeve and the rotating shaft is mounted on the fan head, and the other is mounted on the fan support. The elastic damping component is sleeved on the rotating shaft, and the sleeve is assembled around the outer periphery of the rotating shaft and the elastic damping component. After the sleeve, rotating shaft, and elastic damping component are assembled, the elastic damping component is compressed between the sleeve and the rotating shaft to form an interference fit. By designing and adjusting the appropriate hardness of the elastic damping component and the interference fit, the damping effect required for different fan specifications can be achieved, thereby meeting the requirement for smooth rotation of the fan head.

[0007] As a preferred embodiment, the sleeve is mounted on the fan head, and the shaft is mounted on the fan support. Specifically, the sleeve is mounted on the rear grille of the fan head, with sleeve covers installed on both sides of the rear grille. The sleeve is housed within these sleeve covers, and the shaft is mounted on a U-shaped bracket of the support. The sleeve covers fit into the ends of the U-shaped brackets, forming an installation space that encloses the sleeve, shaft, elastic damping components, and other components.

[0008] The sleeve is equipped with a fan-head gear. After the sleeve, the shaft and the elastic damping component are assembled, the fan-head gear is located outside the elastic damping component.

[0009] The rotating shaft is provided with a support gear on one side, which meshes with the fan head gear.

[0010] The support part is geared and connected to a stepper motor.

[0011] As a preferred embodiment, the elastic damping element is a silicone rubber sleeve. However, other wear-resistant elastic materials may be used as substitutes, depending on the actual production needs.

[0012] The outer periphery of the silicone rubber sleeve is provided with alternating first ribs and grooves, which alternately form a concave-convex structure similar to a thread. The grooves facilitate the application and storage of lubricating oil. Furthermore, after the shaft, rubber sleeve, and sleeve are assembled, the first ribs and sleeve have an interference fit, while only a small gap exists between the grooves and sleeve, providing a certain degree of airtightness. This slows down or prevents lubricating oil evaporation and leakage, further improving the stability and reliability of the oscillating motion.

[0013] As a preferred embodiment, the outer cylindrical surface of the rotating shaft is provided with several second ribs. These second ribs are arranged along the axial direction of the rotating shaft to form vertical ribs, which facilitates the installation of the silicone rubber sleeve and provides a sufficient and appropriate interference fit, thereby ensuring the damping effect. At the same time, the vertical ribs make the rotational resistance on the inner side of the silicone rubber sleeve greater than that on the outer side, thus ensuring that the outer surface with the lubricating oil groove is a rotational friction surface.

[0014] The sleeve and the shaft form a revolute pair, with the sleeve rotating relative to the shaft. This revolute pair allows the two components (sleeve and shaft) to rotate relative to each other about a common axis (central axis). The two components can be locked together along the central axis using bolts and nuts, achieving a limiting position along the central axis.

[0015] The fan's support section is equipped with a U-shaped bracket, and the fan head has a sleeve cover that mates with the U-shaped bracket. A rotating shaft is mounted on the U-shaped bracket, and the sleeve is housed within the sleeve cover. Depending on production requirements, the rotating shaft and U-shaped bracket can be a single, integrally formed structure, or the rotating shaft can be manufactured as a separate component and then assembled onto the U-shaped bracket to form a single unit. Furthermore, a bracket cover is provided on the outside of the U-shaped bracket, and the aforementioned stepper motor is housed within the mounting space formed between the bracket cover and the U-shaped bracket.

[0016] After the aforementioned damping device is assembled in the fan, during fan operation, when the stepper motor starts, its power output shaft drives the support gear to rotate. The support gear meshes with the fan head gear, and the fan head gear (i.e., the sleeve) drives the entire fan head to oscillate up and down relative to the support. During gear transmission, there is gear meshing clearance, which is the shortest distance between the non-working tooth surfaces of two adjacent gears. This clearance is crucial for the stability and lifespan of the gear transmission. Appropriate meshing clearance ensures the formation of a normal lubricating oil film between the tooth surfaces, preventing gear jamming due to thermal expansion and deformation caused by increased gear operating temperature. However, gear meshing clearance can cause play in the gear engagement, especially when the stepper motor is a reduction stepper motor, which requires multiple sets of internal gears for deceleration. The accumulation of these gear meshing clearances can result in significant rotational play between the fan head and the support assembly. Based on the product's appearance layout, when the center of gravity of the fan head is not on the central axis, the position of the fan head's center of gravity relative to the pivot of the support changes during the fan head's oscillation around the central axis. This results in differences in the stability of the gear meshing, posing a risk of easy separation and disassembly, which can easily lead to jamming and abnormal noise. In particular, when the gravitational torque is the main load torque and its direction changes, i.e. when there is a clockwise and counterclockwise reversal relative to the central axis, the gear meshing clearance will exacerbate the jamming or abnormal noise of the fan head. Therefore, a damping device is added at the connection between the support and the fan head. After the shaft, sleeve, and rubber sleeve are assembled, the rubber sleeve is compressed between the shaft and sleeve. Then, according to the actual needs of different fan products, the required damping effect can be achieved by designing and adjusting the appropriate rubber hardness and assembly interference, thereby meeting the requirements for smooth rotation of the fan head. In addition, the rubber sleeve is provided with concave and convex ribs and grooves. The grooves can facilitate the application and storage of lubricating oil. After the shaft, rubber sleeve, and sleeve are assembled, there is only a small assembly gap, which has a certain degree of airtightness. This can effectively slow down or avoid the evaporation and leakage of lubricating oil, further improving the stability and reliability of the oscillation process.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] The damping device used in this fan, located at the connection between the fan's support and the fan head, can significantly reduce the impact of unstable external forces or vibrations, making the internal gear meshing and operation of the fan smoother. This prevents the fan from jamming during its up-and-down oscillation, effectively suppresses transmission noise, improves the reliability of the fan, and enhances the user experience, making it especially suitable for use in quiet resting environments.

[0019] The damping device used in this fan has a simple and reliable structure, low cost, and easy and controllable manufacturing process, which greatly reduces the risk of failure and can be widely used in fan products.

[0020] In the damping device used in this fan, the rubber sleeve is provided with ribs and grooves. The grooves can be used to apply and store lubricating oil. After the shaft, rubber sleeve and sleeve are assembled, there is only a small assembly gap, which has a certain degree of airtightness. This can effectively slow down or avoid the evaporation and leakage of lubricating oil, and further improve the stability and reliability of the oscillation process.

[0021] In the damping device used in this fan, vertical ribs are distributed on the outer cylindrical surface of the rotating shaft, which facilitates the installation of the silicone rubber sleeve and provides sufficient interference fit, thereby ensuring the damping effect. At the same time, the vertical ribs make the rotational resistance on the inner side of the silicone rubber sleeve greater than that on the outer side, thus ensuring that the outer surface with the lubricating oil groove is the rotational friction surface. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the fan structure.

[0023] Figure 2 for Figure 1 The diagram shows the structure of the fan head and support after the fan has been disassembled.

[0024] Figure 3 for Figure 1 The fan shown is a side view.

[0025] Figure 4 for Figure 3 AA section view.

[0026] Figure 5 for Figure 4 A magnified view of a section at point B.

[0027] Figure 6 for Figure 5 A schematic diagram of the disassembled middle sleeve and rotating shaft components.

[0028] Figure 7 This is a schematic diagram of the disassembled components of the damping device.

[0029] Figure 8 This is a schematic diagram of the structure of the elastic damping component after it has been separated from the rotating shaft component.

[0030] Figure 9 This is a schematic diagram of the sleeve component after it has been disassembled from the fan head.

[0031] The components indicated by the reference numerals in the above figures are as follows:

[0032] 1 is the sleeve component, 2 is the rotating shaft component, 3 is the elastic damping component, 4 is the fan head, 5 is the support part, 6 is the rear net, 7 is the sleeve outer cover, 8 is the U-shaped bracket, 9 is the bracket cover, 10 is the fan head gear, 11 is the support part gear, 12 is the stepper motor, 13 is the first rib, 14 is the slot, 15 is the second rib, 16 is the bolt, 17 is the central axis, and 18 is the nut. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0034] Example

[0035] This embodiment provides a damping device for a fan, such as... Figures 4 to 9 As shown, the fan includes a sleeve 1, a rotating shaft 2, and an elastic damping component 3. One of the sleeve and the rotating shaft is mounted on the fan head, and the other is mounted on the fan support. The elastic damping component is sleeved on the rotating shaft. The sleeve is assembled around the outer periphery of both the rotating shaft and the elastic damping component. After assembly, the elastic damping component is pressed between the sleeve and the rotating shaft to form an interference fit (e.g., ...). Figure 5 (As shown). By designing and adjusting the hardness of the appropriate elastic damping component and the assembly interference, the damping effect required for fans of different specifications can be achieved, thereby meeting the requirements for smooth rotation of the fan head.

[0036] In this preferred embodiment, the sleeve is mounted on the fan head 4, and the shaft is mounted on the fan support 5. The sleeve is mounted on the rear grille 6 of the fan head, with sleeve covers 7 on both sides of the rear grille. The sleeve is installed within the sleeve covers (the sleeve covers and the rear grille of the fan head are integrally formed, and the sleeves are fixed together with bolts and nuts). The shaft is mounted on the U-shaped bracket of the support, with the sleeve covers fitting into the end of the U-shaped bracket, forming an installation space that encloses the sleeve, shaft, elastic damping components, and other components. The fan support has a U-shaped bracket 8, and the fan head has a sleeve cover 7 that fits into the U-shaped bracket. The shaft is mounted on the U-shaped bracket, and the sleeve is located within the sleeve cover. Depending on actual production needs, the shaft and U-shaped bracket can be an integrally formed structure, or the shaft can be manufactured as a separate component and then assembled onto the U-shaped bracket to form an integrated structure. In addition, a bracket cover 9 is provided on the outside of the U-shaped bracket, and the aforementioned stepper motor is located in the installation space formed between the bracket cover and the U-shaped bracket. A sleeve is provided on the rear net of the fan head, and the entire fan head is fitted onto the rotating shaft via the sleeve. A rotating pair is formed between the sleeve and the rotating shaft, allowing the sleeve to rotate relative to the rotating shaft. That is, the rear net and the sleeve can rotate around the rotating shaft on the U-shaped bracket, causing the entire fan head to oscillate up and down relative to the support. The rotating pair allows the two components (i.e., the sleeve and the rotating shaft) to rotate relative to each other around a common axis (i.e., the central axis). These two components can be locked on the central axis using bolts 16 and nuts 18, achieving limiting along the central axis direction. The central axis 17 of the sleeve (fan head gear) is the central axis for the entire fan head to oscillate up and down. A nut is provided between the sleeve and the rear net; after the damping device is installed, it can be locked by bolts and nuts, achieving limiting along the central axis direction.

[0037] The sleeve component is equipped with a fan-head gear 10. After the sleeve component, the rotating shaft component, and the elastic damping component are assembled, the fan-head gear is located outside the elastic damping component. A support gear 11 is provided on one side of the rotating shaft component, and the support gear meshes with the fan-head gear (e.g., ...). Figure 5 (As shown). The support part is geared and connected to a stepper motor 12.

[0038] This embodiment is a preferred solution, such as Figure 8As shown, the elastic damping component is a silicone rubber sleeve, but other wear-resistant elastic materials can be used instead, depending on actual production needs. The outer periphery of the silicone rubber sleeve has alternating first ribs 13 and grooves 14, forming a thread-like concave-convex structure. The grooves facilitate the application and storage of lubricating oil. After the shaft, rubber sleeve, and sleeve are assembled, the first ribs and sleeve have an interference fit, while the grooves and sleeve have only a small gap, providing a certain degree of sealing. This slows down or prevents lubricating oil evaporation and leakage, further improving the stability and reliability of the oscillating process. Several second ribs 15 are distributed on the outer cylindrical surface of the shaft. These second ribs are arranged along the axial direction of the shaft, forming vertical ribs. This facilitates the fitting of the silicone rubber sleeve and provides sufficient interference, thus ensuring the damping effect. Simultaneously, the vertical ribs make the rotational resistance inside the silicone rubber sleeve greater than the outside, ensuring that the outer surface of the lubricated groove is a rotational friction surface.

[0039] After the aforementioned damping device is assembled in the fan, during fan operation, when the stepper motor starts, its power output shaft drives the support gear to rotate. The support gear meshes with the fan head gear, and the fan head gear (i.e., the sleeve) drives the entire fan head to oscillate up and down relative to the support. During gear transmission, there is gear meshing clearance, which is the shortest distance between the non-working tooth surfaces of two adjacent gears. This clearance is crucial for the stability and lifespan of the gear transmission. Appropriate meshing clearance ensures the formation of a normal lubricating oil film between the tooth surfaces, preventing gear jamming due to thermal expansion and deformation caused by increased gear operating temperature. However, gear meshing clearance can cause play in the gear engagement, especially when the stepper motor is a reduction stepper motor, which requires multiple sets of internal gears for deceleration. The accumulation of these gear meshing clearances can result in significant rotational play between the fan head and the support assembly. Based on the product's appearance layout, when the center of gravity of the fan head is not on the central axis, the position of the fan head's center of gravity relative to the pivot of the support changes during the fan head's oscillation around the central axis. This results in differences in the stability of the gear meshing, posing a risk of easy separation and disassembly, which can easily lead to jamming and abnormal noise. In particular, when the gravitational torque is the main load torque and its direction changes, i.e. when there is a clockwise and counterclockwise reversal relative to the central axis, the gear meshing clearance will exacerbate the jamming or abnormal noise of the fan head. Therefore, a damping device is added at the connection between the support and the fan head. After the shaft, sleeve, and rubber sleeve are assembled, the rubber sleeve is compressed between the shaft and sleeve. Then, according to the actual needs of different fan products, the required damping effect can be achieved by designing and adjusting the appropriate rubber hardness and assembly interference, thereby meeting the requirements for smooth rotation of the fan head. In addition, the rubber sleeve is provided with concave and convex ribs and grooves. The grooves can facilitate the application and storage of lubricating oil. After the shaft, rubber sleeve, and sleeve are assembled, there is only a small assembly gap, which has a certain degree of airtightness. This can effectively slow down or avoid the evaporation and leakage of lubricating oil, further improving the stability and reliability of the oscillation process.

[0040] As described above, the present invention can be well implemented. The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made in accordance with the content of the present invention are covered by the scope of protection claimed by the claims of the present invention.

Claims

1. A damping device for a fan, characterized in that, It includes a sleeve, a shaft, and an elastic damping component. One of the sleeve and the shaft is mounted on the fan head, and the other is mounted on the fan support. The elastic damping component is sleeved on the shaft. The sleeve is assembled around the outer periphery of the shaft and the elastic damping component. After the sleeve, shaft, and elastic damping component are assembled, the elastic damping component is compressed between the sleeve and the shaft to form an interference fit.

2. The damping device for a fan according to claim 1, characterized in that, The sleeve is installed on the fan head, and the shaft is installed on the fan support.

3. The damping device for a fan according to claim 2, characterized in that, The sleeve is equipped with a fan-head gear. After the sleeve, the shaft and the elastic damping component are assembled, the fan-head gear is located outside the elastic damping component.

4. The damping device for a fan according to claim 3, characterized in that, The rotating shaft is provided with a support gear on one side, which meshes with the fan head gear.

5. A damping device for a fan according to claim 4, characterized in that, The support part is geared and connected to a stepper motor.

6. The damping device for a fan according to claim 1, characterized in that, The elastic damping element is a silicone rubber sleeve.

7. A damping device for a fan according to claim 6, characterized in that, The outer periphery of the silicone rubber sleeve is provided with alternating first ribs and grooves.

8. The damping device for a fan according to claim 1, characterized in that, Several second ribs are distributed on the outer cylindrical surface of the rotating shaft.

9. A damping device for a fan according to claim 1, characterized in that, The sleeve and the rotating shaft form a rotating pair, and the sleeve rotates relative to the rotating shaft.

10. A damping device for a fan according to claim 1, characterized in that, The fan's support section is equipped with a U-shaped bracket, and the fan head is equipped with a sleeve cover. The sleeve cover cooperates with the U-shaped bracket, the rotating shaft is located on the U-shaped bracket, and the sleeve is located in the sleeve cover.

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