fan

Abstract

The utility model discloses a fan, include: casing, casing is equipped with air cavity, fan blade, rotatable be equipped with in air cavity, drive arrangement, be equipped with in air cavity, and with fan blade drive connection, pivot, be equipped with in air cavity, pivot sets up along the rotation axis of fan blade, and pivot is rotatable with casing Connection, dynamic balance piece, fix on the pivot, dynamic balance piece extends outward along the radial of pivot, and dynamic balance piece is embedded in the fan blade. The utility model can realize two key optimization simultaneously, first, make fan blade can adjust its gravity center position through dynamic balance piece, make its coincidence degree with the axis of pivot improve, second, pivot can expand the contact area with fan blade with the help of dynamic balance piece. This double improvement can effectively offset the dynamic unbalanced torque of fan blade high -speed rotation due to centrifugal force, thereby significantly restrain vibration amplitude, promote rotation stability, finally reduce fan blade operation noise.

Description

Technical Field

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

[0002] With the continued increase in the penetration rate of portable electronic devices, fans have become an essential product for outdoor activities and office settings in summer due to their portability. Industry forecasts predict that the global fan market will exceed $12 billion by 2025, with a compound annual growth rate of 8.7%. However, behind this market growth lies a deep-seated contradiction in user experience: third-party survey data shows that 62% of consumers abandon products from specific brands due to noise issues, and another 23% of after-sales complaints directly point to abnormal fan noise. Technical analysis reveals that the core cause of this problem lies in the poor dynamic balance of the fan blades, which easily vibrates during rotation, resulting in a harsh sound and significantly reducing user comfort. Utility Model Content

[0003] In view of this, the present invention provides a fan that can solve the problem of poor dynamic balance performance of existing fans, which leads to harsh noise and significantly reduces user comfort.

[0004] This application provides a fan, including: The housing is provided with an air cavity; The fan blades are rotatably disposed within the air cavity; A drive unit is disposed inside the air cavity and is connected to the fan blade drive. A rotating shaft is disposed within the air cavity, the rotating shaft is arranged along the rotation axis of the fan blade, and the rotating shaft is rotatably connected to the housing; A dynamic balancing component is fixed on the rotating shaft, the dynamic balancing component extends radially outward along the rotating shaft, and the dynamic balancing component is embedded in the fan blade.

[0005] In one embodiment of this application, the dynamic balancing components are centrally symmetrically distributed along the rotation axis of the fan blade.

[0006] In one embodiment of this application, the dynamic balancing component is provided with a mounting hole, and the rotating shaft passes through the mounting hole.

[0007] In one embodiment of this application, the dynamic balancing component has a plurality of grooves on its peripheral side, and the grooves are distributed at intervals along the circumference of the dynamic balancing component.

[0008] In one embodiment of this application, a plurality of the grooves are equally spaced along the circumference of the dynamic balancing member.

[0009] In one embodiment of this application, the fan blade includes a hub and blades, the blades being disposed on the outer peripheral surface of the hub; the hub is provided with a reinforcing protrusion, the reinforcing protrusion enclosing the dynamic balancing component and part of the rotating shaft.

[0010] In one embodiment of this application, the reinforcing protrusion includes a first portion that encloses the dynamic balancing member and a second portion that encloses the rotating shaft, wherein the size of the second portion gradually decreases from the first portion toward the direction away from the second portion.

[0011] In one embodiment of this application, the housing includes an air guide body and a middle cylinder shaft. The air guide body forms the air cavity, and the middle cylinder shaft is disposed in the air cavity. The end of the middle cylinder shaft away from the fan blade is fixed to the air guide body. The rotating shaft is inserted into the middle cylinder shaft and is rotatably connected to the rotating shaft through a bearing.

[0012] In one embodiment of this application, the middle cylinder shaft is connected to the air guide body sleeve.

[0013] In one embodiment of this application, the end of the middle cylinder shaft away from the fan blade is provided with a toothed structure, and the middle cylinder shaft is connected to the air guide body sleeve through the toothed structure; the toothed structure is arranged circumferentially around the middle cylinder shaft.

[0014] Compared with the prior art, the fan provided by this utility model has at least the following beneficial effects: The fan provided by this utility model, by setting a rotating shaft and a dynamic balancing component, rotatably connects the rotating shaft to the housing and fixes the dynamic balancing component on the rotating shaft. Simultaneously, the dynamic balancing component is embedded within the fan blades, achieving two key optimizations: first, the fan blades' center of gravity can be adjusted via the dynamic balancing component, increasing its alignment with the axis of the rotating shaft; second, the rotating shaft's contact area with the fan blades can be increased with the help of the dynamic balancing component. This dual improvement effectively counteracts the dynamic imbalance torque generated by centrifugal force during high-speed fan blade rotation, thereby significantly suppressing vibration amplitude, improving rotational smoothness, and ultimately reducing fan blade operating noise. Attached Figure Description

[0015] Figure 1 A three-dimensional structural diagram of the fan provided in an embodiment of this application; Figure 2 for Figure 1 An exploded view of the fan shown; Figure 3 for Figure 1 The cross-sectional view of the fan shown; Figure 4 A cross-sectional view of the assembly consisting of an inner shell, a middle cylinder shaft, a rotating shaft, and a bearing, provided in an embodiment of this application. Figure 5A three-dimensional structural diagram of the inner shell provided in an embodiment of this application; Figure 6 A three-dimensional structural schematic diagram of the middle cylinder shaft provided in an embodiment of this application; Figure 7 A three-dimensional structural diagram of the assembly consisting of fan blades, dynamic balancing components, and rotating shaft provided in an embodiment of this application; Figure 8 A three-dimensional structural diagram of the assembly consisting of a rotating shaft and a dynamic balancing component provided in an embodiment of this application; Figure 9 This is a three-dimensional structural diagram of the dynamic balancing component provided in an embodiment of this application.

[0016] In the picture: 10. Housing; 20. Air guide section; 201. Air cavity; 202. First end; 203. Second end; 21. Air guide body; 22. Outer shell; 23. Inner shell; 231. Mounting base; 232. Seat body; 233. Connecting rod; 24. Middle cylinder shaft; 241. Toothed structure; 25. First grid frame; 26. Second grid frame; 30. Handheld part; 31. Charging interface; 40. Fan blade; 41. Hub; 42. Blade; 43. Reinforcing protrusion; 431. First part; 432. Second part; 51. Dynamic balancing component; 511. Mounting hole; 512. Groove; 52. Rotating shaft; 53. Bearing; 60. Drive device; 61. Stator; 62. Rotor; 63. Circuit board; 70. Battery. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0018] It should be noted that all directional indicators (such as up, down, left, right, front, back, inside, outside, top, bottom, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0019] It should also be noted that when a component is referred to as "fixed to" or "set on" another component, the component may be directly on the other component or there may be an intervening component present. When a component is referred to as "connected to" another component, it may be directly connected to the other component or there may be an intervening component present.

[0020] Please see Figures 1 to 9 The present invention provides a fan comprising a housing 10, fan blades 40, a rotating shaft 52, and a drive device 60.

[0021] like Figure 2 and Figure 3 As shown, the housing 10 has an air cavity 201; the fan blade 40, the rotating shaft 52, and the drive device 60 are all located inside the air cavity 201; the fan blade 40 is rotatably disposed inside the air cavity 201; the rotating shaft 52 is rotatably connected to the housing 10, and a dynamic balancing component 51 is fixed on the rotating shaft 52 and extends outward along the radial direction of the rotating shaft 52, with the dynamic balancing component 51 embedded at the center position of the fan blade 40. The drive device 60 is mounted on the housing 10 and is drivenly connected to the fan blade 40 to drive the fan blade 40 to rotate, so that the external airflow can enter the air cavity 201 under the drive of the fan blade 40, and then blow from the air cavity 201 onto the skin to achieve a cooling effect.

[0022] By setting up a rotating shaft 52 and a dynamic balancing component 51, the rotating shaft 52 is rotatably connected to the housing 10, and the dynamic balancing component 51 is fixed to the rotating shaft 52. Simultaneously, the dynamic balancing component 51 is embedded within the fan blade 40, achieving two key optimizations: first, the fan blade 40 can adjust its center of gravity position with the help of the dynamic balancing component 51, increasing its alignment with the axis of the rotating shaft 52; second, the rotating shaft 52 can expand its contact area with the fan blade 40 with the help of the dynamic balancing component 51. This dual improvement effectively counteracts the dynamic imbalance torque generated by centrifugal force when the fan blade rotates at high speed, thereby significantly suppressing vibration amplitude, improving rotational smoothness, and ultimately reducing the operating noise of the fan blade 40.

[0023] Optional, such as Figure 1 As shown, the housing 10 includes an air guide section 20 and a handheld section 30. The air guide section 20 is generally cylindrical, and an air cavity 201 is formed within it. The air guide section 20 has a first end 202 and a second end 203 disposed opposite to each other. The handheld section 30 is for the user to hold and is used to install the battery 80. To facilitate holding the handheld section 30, it is generally cylindrical, and can be a square cylinder, a circular cylinder, or other shapes. Further, as... Figure 3 As shown, the air guide section 20 includes an air guide body 21 and a middle cylinder shaft 24. The air guide body 21 includes an outer shell 22 and an inner shell 23 disposed within the outer shell 22. The outer shell 22 and the inner shell 23 are detachably connected, for example, by bolts or screws. The air cavity 201 is formed within the inner shell 23.

[0024] like Figure 4 As shown, a mounting base 231 is provided inside the cavity of the inner shell 23, and a ventilation hole 224 is formed on the mounting base 231 to allow airflow. Further, as... Figure 5As shown, the mounting base 231 includes a base body 232 and a connecting rod 233. The base body 232 is coaxially arranged with the inner shell 23. The base body 232 is connected to the inner wall of the inner shell 23 through the connecting rod 233. There are several connecting rods 233, which are evenly distributed in a ring around the axis of the inner shell 23. A ventilation hole 224 is formed between two adjacent connecting rods 233.

[0025] like Figure 3 As shown, the air guide section 20 also includes a central cylinder shaft 24 located within the air cavity 201. The central cylinder shaft 24 is located on one side of the fan blade 40, specifically between the first end 202 and the fan blade 40. The end of the central cylinder shaft 24 away from the fan blade 40 is fixed to the air guide body 21, specifically to the seat 232 of the mounting base 231 of the inner shell 23. One end of the rotating shaft 52 is inserted into the central cylinder shaft 24 and is rotatably connected to the rotating shaft 52 through a bearing 53. This arrangement can achieve dual limiting of the rotating shaft 52 through the axial constraint of the central cylinder shaft 24 and the radial support of the bearing 53, ensuring that the rotating shaft 52 remains stable during rotation, effectively suppressing the radial runout and axial movement of the rotating shaft 52 during rotation, thereby improving the smoothness and reliability of the fan blade 40 rotation, and achieving the beneficial effect of further stabilizing the fan blade 40.

[0026] Furthermore, the end of the middle cylinder shaft 24 furthest from the fan blade 40 is integrally connected to the air guide body 21, specifically integrally connected to the seat 232 of the mounting base 231 of the air guide body 21. This integral connection, achieved through injection molding, fuses the middle cylinder shaft 24 with the air guide part 20, avoiding positioning deviations caused by assembly gaps or human operation in traditional mechanical connections. This ensures that the axis of the middle cylinder shaft 24 is strictly aligned with the axis of the air guide body 21, reducing the perpendicularity error of the middle cylinder shaft 24. Consequently, it ensures that the axis of the entire fan blade 40 is also well aligned with the axis of the air guide body 21, making the centrifugal force generated during the rotation of the fan blade 40 more uniform and effectively reducing vibration and noise caused by unbalanced forces.

[0027] Specifically, such as Figure 6 As shown, the end of the middle cylinder shaft 24 away from the fan blade 40 is provided with a toothed structure 241. The middle cylinder shaft 24 is connected to the seat body 232 of the mounting base 231 through the toothed structure 241; the toothed structure 241 surrounds the middle cylinder shaft 24. The toothed structure 241 can increase the connection force between the middle cylinder shaft 24 and the mounting base 231, making it less likely for the middle cylinder shaft 24 to detach from the mounting base 231. On the other hand, it can help increase the weight of the middle cylinder shaft 24, which helps to improve the vibration resistance of the middle cylinder shaft 24.

[0028] To further enhance the connection between the central cylinder shaft 24 and the air guide body 21, as well as the vibration resistance of the central cylinder shaft 24, at least two toothed structures 241 are provided, spaced apart sequentially along the axis of the central cylinder shaft 24. In one feasible embodiment, the teeth of adjacent toothed structures 241 are aligned. This arrangement facilitates the machining and forming of all toothed structures 241 on the central cylinder shaft 24. In other feasible embodiments, the teeth of adjacent toothed structures 241 may be staggered circumferentially along the central cylinder shaft 24. This staggered arrangement helps to disperse vibrations on the central cylinder shaft 24 onto the air-generating housing 10, effectively reducing noise.

[0029] Optionally, the middle cylinder shaft 24 is preferably made of a metal material with good heat dissipation performance, such as copper or aluminum. This configuration allows the middle cylinder shaft 24 to transfer the heat generated by the drive device 60 to the air guide body 21, which then transfers the heat to the airflow or other heat dissipation devices, achieving a beneficial effect on heat dissipation for the drive device 60. At the same time, the metal material of the middle cylinder shaft 24 allows for higher machining precision, enabling a more precise fit between the middle cylinder shaft 24 and the bearing 53, thereby better preventing noise generation.

[0030] like Figure 2 and Figure 3 As shown, the air guide section 20 also includes a first grid frame 25 and a second grid frame 26 through which airflow can pass. The first grid frame 25 and the second grid frame 26 are respectively installed at both ends of the housing 22 and are respectively positioned near the first end 202 and the second end 203. The arrangement of the first grid frame 25 and the second grid frame 26 helps to prevent foreign objects from entering the air cavity 201.

[0031] At least one of the first grid frame 25 and the second grid frame 26 is detachably mounted on the housing 22. This arrangement facilitates the installation of the fan blade 40, the drive device 60, and other parts within the air cavity 201. When the fan blade 40, drive device 60, etc., need to be installed in the air cavity 201, the first grid frame 25 or the second grid frame 26 can be removed from the housing 22, and the fan blade 40, drive device 60, etc., can then be placed inside the air cavity 201. In one embodiment, the first grid frame 25 is detachably mounted on the housing 22 of the air guide body 21, and the second grid frame 26 is fixed to the housing 22 of the air guide body 21 and integrally formed with the housing 22.

[0032] Optionally, the fan blade 40 and the dynamic balancing component 51 are integrally molded together. This integral molding process fuses the fan blade 40 and the dynamic balancing component 51, avoiding the stress concentration problems associated with traditional mechanical connections (such as screws and riveting). This significantly improves the fatigue resistance and vibration resistance of the structure composed of the shaft 52, the dynamic balancing component 51, and the fan blade 40. Furthermore, the integrated molding of the fan blade 40 and the dynamic balancing component 51 ensures strict alignment of the center of gravity of the fan blade 40 with the axis of the shaft 52, thereby balancing the centrifugal force during rotation, reducing vibration amplitude, and further reducing noise. In addition, the integral molding eliminates the need for subsequent assembly of the dynamic balancing component 51 onto the fan blade 40, reducing labor and material costs.

[0033] Furthermore, such as Figure 7 As shown, the fan blade 40 includes a hub 41 and blades 42. The hub 41 has a cylindrical structure with one end closed. The blades 42 are located on the outer circumferential surface of the hub 41. There are several blades 42, which are evenly distributed in a ring around the axis of the hub 41. The dynamic balancing component 51 is located at the center of the hub 41.

[0034] Furthermore, the hub 41 is provided with a reinforcing protrusion 43, which covers the dynamic balancing component 51 and part of the shaft 52. The reinforcing protrusion 43 can further increase the contact area between the shaft and the fan blade 40, thereby further reducing noise. In addition, it can strengthen the connection between the shaft 52 and the dynamic balancing component 51, effectively preventing the risk of the shaft 52 detaching from the dynamic balancing component 51.

[0035] The reinforcing protrusion 43 has a first part 431 and a second part 432. The first part 431 covers the dynamic balancing component 51, and the second part 432 covers the rotating shaft 52. The size of the second part 432 gradually decreases from the first part 431 towards the direction away from the second part 432. The gradual change in size of the second part 432 can effectively reduce the weight of this part while ensuring that the second part 432 maintains sufficient connection force to the rotating shaft 52, thereby reducing the overall weight of the fan blade 40.

[0036] Optionally, the dynamic balancing component 51 is provided with a mounting hole 511, through which the rotating shaft 52 passes. This arrangement allows the dynamic balancing component 51 to be fitted onto the rotating shaft 52, so that the weight of the fan blade 40 and the dynamic balancing component 51 can directly act on the rotating shaft 52, effectively promoting the alignment of the center of gravity of the fan blade 40 with the axis of the rotating shaft 52. Specifically, the fitted structure of the dynamic balancing component 51 and the rotating shaft 52 ensures that the weight distribution of the fan blade 40 is more closely distributed around the axis of the rotating shaft 52 during rotation, thereby significantly improving the dynamic balance performance of the rotating shaft 52.

[0037] Optionally, the dynamic balancing component 51 is a single block structure made of metal. The high density of the metal block effectively balances the centrifugal force generated by the fan blade 40 during rotation, ensuring the stability of the fan blade 40's rotation. Furthermore, the high mechanical strength of the metal material makes the dynamic balancing component 51 less prone to fatigue damage. Additionally, the metal material is easy to process, facilitating the molding of the dynamic balancing component 51. Alternatively, the dynamic balancing component 51 can be selected as multiple block structures, evenly distributed in a ring along the axis of the fan blade 40, which can also effectively balance the centrifugal force generated by the fan blade 40 during rotation.

[0038] In one embodiment, such as Figure 8 and Figure 9 As shown, the dynamic balancing component 51 is a single block structure, and several grooves 512 are provided on its circumference. These grooves 512 are distributed at intervals along the circumference of the dynamic balancing component 51. The grooves 512 increase the contact area between the dynamic balancing component 51 and the fan blade 40, which helps to further reduce the noise of the fan blade 40. Furthermore, the grooves 512 are evenly distributed along the circumference of the dynamic balancing component 51, which allows the center of gravity of the fan blade 40 to be closer to the axis of the rotating shaft 52.

[0039] Optional, such as Figure 3 As shown, the drive unit 60 includes a stator 61, a rotor 62, and a drive circuit board 63. The stator 61 is fitted onto the outer side of the middle cylinder shaft 24, and the rotor 62 is fitted onto the outer side of the stator 61 and rotatably mounted relative to the stator 61. The rotor 62 is installed inside the hub 41 and connected to the inner wall of the hub 41 by an interference fit. The drive circuit board 63 is electrically connected to the stator 61. When the stator 61 is energized through the drive circuit board 63, it generates a magnetic field, and the rotor 62 rotates under the action of the magnetic field, causing the fan blades 40 to rotate. The drive circuit board 63 can be optionally located on one side of the stator 61 and fitted onto the outer side of the middle cylinder shaft 24.

[0040] Optionally, the fan also includes a battery 80, which is installed inside the handheld unit 30. The battery 80 can be a primary battery or a rechargeable battery. If it is a rechargeable battery, a charging interface 31 can be provided on the handheld unit 30. The rechargeable battery is charged by connecting to an external power source through the charging interface 31.

[0041] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A fan, characterized in that, include: The housing is provided with an air cavity; The fan blades are rotatably disposed within the air cavity; A drive unit is disposed inside the air cavity and is connected to the fan blade drive. A rotating shaft is disposed within the air cavity, the rotating shaft is arranged along the rotation axis of the fan blade, and the rotating shaft is rotatably connected to the housing; A dynamic balancing component is fixed on the rotating shaft, the dynamic balancing component extends radially outward along the rotating shaft, and the dynamic balancing component is embedded in the fan blade.

2. The fan according to claim 1, characterized in that, The dynamic balancing components are centrally symmetrically distributed along the rotation axis of the fan blade.

3. The fan according to claim 1, characterized in that, The dynamic balancing component is provided with mounting holes, and the rotating shaft passes through the mounting holes.

4. The fan according to claim 1, characterized in that, The dynamic balancing component has several grooves on its circumferential side, and the grooves are distributed at intervals along the circumferential direction of the dynamic balancing component.

5. The fan according to claim 4, characterized in that, Several of the grooves are evenly distributed along the circumference of the dynamic balancing component.

6. The fan according to any one of claims 1 to 5, characterized in that, The fan blades include a hub and blades, with the blades disposed on the outer circumferential surface of the hub; the hub is provided with a reinforcing protrusion, which encloses the dynamic balancing component and part of the rotating shaft.

7. The fan according to claim 6, characterized in that, The reinforcing protrusion includes a first portion that encloses the dynamic balancing component and a second portion that encloses the rotating shaft, the size of the second portion gradually decreasing from the first portion toward the direction away from the second portion.

8. The fan according to claim 1, characterized in that, The housing includes an air guide body and a middle cylinder shaft. The air guide body forms the air cavity, and the middle cylinder shaft is disposed in the air cavity. The end of the middle cylinder shaft away from the fan blade is fixed to the air guide body. The rotating shaft is inserted into the middle cylinder shaft and is rotatably connected to the rotating shaft through a bearing.

9. The fan according to claim 8, characterized in that, The middle cylinder shaft is connected to the air guide body sleeve.

10. The fan according to claim 8, characterized in that, The middle cylinder shaft is provided with a toothed structure at one end away from the fan blade, and the middle cylinder shaft is connected to the air guide body through the toothed structure; the toothed structure is arranged circumferentially around the middle cylinder shaft.

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