Portable fan

Abstract

The utility model provides a portable fan which comprises a shell, an air inlet cavity, a fixing cavity and an air duct are sequentially arranged in the length direction of the shell, the shell is further provided with an air inlet and an air outlet, the air inlet communicates with the air inlet cavity, and the air outlet communicates with the air duct; the braking assembly is contained in the fixing cavity, the braking assembly sucks air from the air inlet, and the air passes through the air inlet cavity, the braking assembly and the air duct and then is blown out from the air outlet; wherein the air outlet is formed in the length direction of the air duct, the shell is provided with an inner surface and an outer surface, the air outlet is limited by the inner surface and the outer surface, and the inner surface and the outer surface are close to each other or overlapped at the air outlet. The air outlet is limited by the inner surface and the outer surface together, so that the air outlet pressure can be enhanced, and the air outlet distance is farther; and the inner surface and the outer surface play a role in guiding outlet air, so that the noise is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of fans, and in particular to a portable fan with good air output effect. Background Art

[0002] In recent years, people are increasingly pursuing a more convenient life. In order to meet the demand for using fans in outdoor activities or other life scenarios, a variety of portable fan products have appeared on the market, such as handheld fans, neck-hanging fans, etc.

[0003] Most of the current portable fans still use ordinary axial flow fan blades, so the air outlet is also directly located on the front shell of the axial flow fan blades and blows directly toward the user. The turbulent airflow and noise generated by the axial flow fan blades blow directly toward the user, resulting in a poor user experience. Summary of the Invention

[0004] In view of this, the present application provides a portable fan that, by defining an air outlet through the inner and outer surfaces, can enhance the air pressure and extend the air discharge distance. Furthermore, both the inner and outer surfaces guide the air flow, which helps reduce noise. The air blown out is strong, smooth, and even, providing users with a good blowing experience.

[0005] The present application provides a portable fan, comprising: a shell, which is provided with an air inlet cavity, a fixed cavity and an air duct in sequence along the length direction, the shell is also provided with an air inlet and an air outlet, the air inlet is connected to the air inlet cavity, and the air outlet is connected to the air duct; a brake assembly is accommodated in the fixed cavity, the brake assembly sucks air from the air inlet, passes through the air inlet cavity, the brake assembly and the air duct, and then blows it out from the air outlet; wherein the air outlet is arranged along the length direction of the air duct, the shell has an inner surface and an outer surface, the air outlet is defined by the inner surface and the outer surface, and the inner surface and the outer surface are close to or overlap each other at the air outlet.

[0006] Furthermore, the air outlet has an outlet, and at the outlet of the air outlet, the interval between the inner surface and the outer surface is in the range of 1-5 mm.

[0007] Furthermore, the shell includes a first wall and a second wall, the first side of the first wall is closed and connected to the first side of the second wall, the second side of the first wall is opposite to and spaced from the second side of the second wall, and the outer surface of the first wall and the inner surface of the second wall define the air outlet.

[0008] Furthermore, the first side of the first wall and the second side of the first wall extend in the same direction, and the second side of the first wall extends beyond the first side of the first wall, the first side of the second wall and the second side of the second wall extend in the same direction, and the second side of the second wall extends beyond the first side of the second wall, and the depth of the air outlet is 15-23 mm.

[0009] Furthermore, it includes a plurality of guide members, which are spaced apart along the length direction of the air duct, and are used to guide the wind generated by the brake assembly to blow toward the air outlet, and the guide members abut against the first wall and the second wall at the same time.

[0010] Furthermore, the brake assembly includes a motor and a fan, the motor includes a cylinder, a stator assembly and a rotor assembly, the motor is a three-phase high-speed motor, and at least a portion of the fan is disposed in the cylinder.

[0011] Furthermore, the cylinder body includes an outer ring portion, an inner ring portion, and a plurality of connecting blades connecting the outer ring portion and the inner ring portion, the inner ring portion is arranged on a side of the outer ring portion close to the air duct, a base plate is provided in the inner ring portion, and a hollow shaft cylinder extends axially from the base plate toward the air inlet chamber, the rotor assembly includes a rotating shaft, a bearing and a magnetic ring, the rotating shaft and at least one bearing are arranged in the shaft cylinder, the stator assembly is arranged radially outside the rotating shaft and the shaft cylinder, and the magnetic ring is arranged radially outside the stator assembly; the fan is arranged on a side of the outer ring portion close to the air inlet chamber, and the fan is fixed on the rotating shaft; the inner ring portion is formed with a receiving portion on the side of the substrate facing the air duct, a drive plate is provided in the receiving portion, the control component is electrically connected to the drive plate, and the substrate is also provided with a notch, and a wire is electrically connected to the stator assembly and the drive plate via the notch.

[0012] Furthermore, it also includes a control component, which includes a power supply for providing power to the brake component, and a control component for controlling the brake component, the power supply is electrically connected to the control component, and the control component is electrically connected to the drive board; the shell is provided with the air inlet chamber, the fixed chamber, the air duct and the accommodating chamber along the length direction, the control component is accommodated in the accommodating chamber, and the control component includes a switch and an interface exposed outside the shell.

[0013] Furthermore, the length of the air duct is 4-6 times the length of the air inlet cavity, the maximum cross-sectional area of ​​the air duct is smaller than the minimum cross-sectional area of ​​the air inlet cavity, the maximum cross-sectional area of ​​the fixed cavity is smaller than or equal to the minimum cross-sectional area of ​​the air inlet cavity, and the minimum cross-sectional area of ​​the fixed cavity is greater than or equal to the maximum cross-sectional area of ​​the air duct.

[0014] Furthermore, the portion of the shell in the fixed cavity is cylindrical, the diameter of the portion of the shell in the fixed cavity is 28-35 mm, and the length of the shell in the fixed cavity is 30-40 mm.

[0015] Compared with the existing technology, the portable fan of the present application has the following advantages: the inner surface and the outer surface together define the air outlet, which can enhance the air pressure and extend the air discharge distance; and the inner surface and the outer surface both have a guiding effect, which helps to reduce noise. The wind blown out is strong and smooth and uniform, providing users with a good blowing experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the portable fan of the present application;

[0017] Figure 2 is a cross-sectional view of the portable fan of the present application;

[0018] Figure 3 It is a partial exploded view of the portable fan of the present application;

[0019] Figure 4 is a cross-sectional view of the portable fan of the present application from another angle;

[0020] Figure 5 yes Figure 4 Enlarged view of part D in the middle;

[0021] Figure 6 yes Figure 4 Schematic diagram from another angle;

[0022] Figure 7 yes Figure 2 Enlarged view of part C;

[0023] Figure 8 It is a cross-sectional view of the brake assembly of the present application. DETAILED DESCRIPTION

[0024] In order to facilitate a better understanding of the purpose, structure, features and effects of this application, this application is further described in conjunction with the accompanying drawings and specific implementation methods.

[0025] It should be noted that when an element is considered to be “connected to” another element, it can be directly connected to the other element or there may be an intervening element at the same time.

[0026] In this application, descriptions such as “first”, “second”, etc. are only used for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0027] In the description of this application, the terms "front", "back", "left", "right", "up", "down", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on this application.

[0028] In one embodiment, Figures 1 to 3 , which is a schematic diagram of the portable fan of the present application. The portable fan comprises a housing 1 and a brake assembly. The housing 1 is provided with an air inlet cavity 13, a fixed cavity 14, and an air duct 15, sequentially along its length. The housing 1 is also provided with an air inlet 11 and an air outlet 12. The air inlet 11 communicates with the air inlet cavity 13, and the air outlet 12 communicates with the air duct 15. The brake assembly is housed in the fixed cavity 14. The brake assembly draws air in from the air inlet 11, passes through the air inlet cavity 13, the brake assembly, and the air duct 15, and then blows air out from the air outlet 12.

[0029] Among them, such as Figure 1 、 Figure 3 and Figure 4 As shown, the air outlet 12 is arranged along the length of the air duct 15. The housing 1 has an inner surface 1A and an outer surface 1B. The air outlet 12 is defined by the inner surface 1A and the outer surface 1B. The inner surface 1A and the outer surface 1B are close to or overlap each other at the air outlet 12. The brake assembly is housed in the fixing cavity 14, making the portable fan safer. The air outlet 12 is defined by the inner surface 1A and the outer surface 1B of the housing 1, and the air blown out is strong, smooth and uniform, providing a good blowing experience for the user.

[0030] In one embodiment, Figures 4 to 6 As shown, the air outlet 12 has an outlet 121. At the outlet 121 of the air outlet 12, the interval between the inner surface 1A and the outer surface 1B is 1-5 mm, which is conducive to the air flow being ejected from the outlet 121 of the air outlet 12 with greater wind force.

[0031] In one embodiment, Figures 3 to 5As shown, the shell 1 includes a first wall 1a and a second wall 1b, and the first wall 1a and the second wall 1b are formed separately and then assembled. The first side of the first wall 1a is closed and connected to the first side of the second wall 1b, and the second side of the first wall 1a is opposite to and spaced from the second side of the second wall 1b. The outer surface 1B of the first wall 1a and the inner surface 1A of the second wall 1b define the air outlet 12. In this embodiment, the first side of the first wall 1a and the second side of the first wall 1a extend in the same direction, and the second side of the first wall 1a extends beyond the first side of the first wall 1a; the first side of the second wall 1b and the second side of the second wall 1b extend in the same direction, and the second side of the second wall 1b extends beyond the first side of the second wall 1b. The depth of the air outlet 12 is 15-23 mm. The air outlet 12 with a suitable depth can better rectify the outgoing air, reduce noise, and avoid turbulence.

[0032] In one embodiment, Figures 3 to 6 As shown, the portable fan further includes a plurality of guide members 151, which are spaced apart along the length of the air duct 15. The guide members 151 are used to guide the wind generated by the brake assembly toward the air outlet 12, and the guide members 151 abut against the first wall 1a and the second wall 1b at the same time. By providing the guide members 151, the airflow is rectified and guided, noise is reduced, and turbulence is avoided. It should be understood that there may be a gap between the outer surface 1B of the first wall 1a and the inner surface 1A of the second wall 1b, thereby defining the air outlet 12; or there may be no gap between at least a portion of the outer surface 1B of the first wall 1a and the inner surface 1A of the second wall 1b, that is, there is an overlapping relationship, and the overlapping portion is stretched apart by the guide members 151, thereby defining the air outlet 12.

[0033] In one embodiment, Figures 3 to 6 As shown, a suction port 1d is further provided on one side of the air outlet 12, and the air from outside the portable fan is drawn through the suction port 1d by the air flow blown out of the air outlet 12. The housing 1 also includes a third wall 1c, which is provided on the outside of the second side of the second wall 1b. The third wall 1c is sheet-shaped, and is spaced apart from the second side of the second wall 1b to form the suction port 1d. The suction port 1d is provided on one side of the air outlet 12, and the external natural airflow can be attracted through the suction port 1d on the basis of the wind generated by the brake assembly, and together with the wind from the air outlet 12, a larger but equally smooth and uniform airflow is formed, which provides the user with a better blowing experience. The suction port 1d extends parallel to the air outlet 12, and the suction port 1d and the air outlet 12 are arranged side by side along the length direction, which provides a better air outlet effect.

[0034] In one embodiment, Figures 3 to 6 As shown, the spacing between the third wall 1c and the second side of the second wall 1b is 2.7-3.1 mm, and the spacing between the third wall 1c and the second side of the first wall 1a is 6.6-12.6 mm. The width of the air intake 1d is also relatively small, allowing air to be ejected through the air intake 1d with greater force. The outer surface 1B of the second side of the first wall 1a is formed with a Coanda surface, and the air outlet 12 is arranged to direct airflow onto the Coanda surface.

[0035] In one embodiment, Figures 3 to 6 As shown, one side of the third wall 1c extends in the same direction as the second side of the second wall 1b, and one side of the third wall 1c extends beyond the second side of the second wall 1b; the other side of the third wall 1c extends in the same direction as the second side of the first wall 1a, and the other side of the third wall 1c does not extend beyond the second side of the first wall 1a. The depth of the air intake 1d is relatively small, which is conducive to the airflow of the air outlet 12 to draw the external airflow through the air intake 1d. And one side of the third wall 1c extends beyond the second side of the second wall 1b. The third wall 1c can better guide the airflow, and the airflow of the air outlet 12 and the air intake 1d can be smoother and more uniform.

[0036] In one embodiment, Figures 1 to 3 As shown, the length of the air inlet cavity 13 is 20-30 mm, the length of the air duct 15 is 2-6 times the length of the air inlet cavity 13, the maximum cross-sectional area of ​​the air duct 15 is smaller than the minimum cross-sectional area of ​​the air inlet cavity 13, the maximum cross-sectional area of ​​the fixed cavity 14 is less than or equal to the minimum cross-sectional area of ​​the air inlet cavity 13, and the minimum cross-sectional area of ​​the fixed cavity 14 is greater than or equal to the maximum cross-sectional area of ​​the air duct 15. The cross-sectional areas of the air inlet cavity 13, the fixed cavity 14, and the air duct 15 decrease along the length direction, and the transition between adjacent two of the air inlet cavity 13, the fixed cavity 14, and the air duct 15 is smooth. The air inlet cavity 13 is short in length but has a larger cross-sectional area, which is conducive to air suction and diversion, thereby increasing the air intake volume. The provision of the air inlet cavity 13 can effectively avoid turbulence and noise caused by direct contact between external airflow and the brake assembly. The cross-section of the air duct 15 is small, and the wind generated by the brake assembly is pressurized and concentrated in the air duct 15, thereby enhancing the wind outlet effect; the length of the air duct 15 is long, which can increase the wind outlet range and improve the blowing experience.

[0037] In one embodiment, Figures 1 to 3As shown, the portion of the housing 1 within the fixed cavity 14 is cylindrical, with a diameter of 28-35mm and a length of 30-40mm. The smaller diameter of the fixed cavity 14 allows for a smaller overall cross-section of the housing 1, resulting in a relatively slender and well-proportioned neckband fan, making it easier to carry. The shorter length of the fixed cavity 14 also allows for a more reasonable length of the air duct 15.

[0038] In one embodiment, Figure 2 、 Figure 3 、 Figure 7 and Figure 8 As shown, the brake assembly includes a motor 2 and a fan 3. The motor 2 includes a barrel 21, a stator assembly 22, and a rotor assembly 23. The motor 2 is a three-phase high-speed motor 2 that can provide a high and stable speed, thereby improving the air output effect. At least a portion of the fan 3 is disposed within the barrel 21. In this embodiment, the entire fan 3 is disposed within the barrel 21. Therefore, the brake assembly has a compact and reasonable structure, and the length of the cavity occupied is relatively short.

[0039] In one embodiment, Figure 2 、 Figure 3 、 Figure 7 and Figure 8 As shown, the brake assembly further includes a buffer sleeve 33 disposed outside the cylinder 21. The buffer sleeve 33 includes an annular portion 331 and a plurality of protrusions 332 spaced around the outer surface 1B of the annular portion 331. When the brake assembly is received in the fixing cavity 14, at least a portion of the protrusions 332 are compressed, thereby firmly securing the brake assembly to the fixing cavity 14. The buffer sleeve 33 provides strong friction and shock absorption for the brake assembly, effectively reducing noise generated by the brake assembly.

[0040] In one embodiment, Figure 2 、 Figure 3 、 Figure 7 and Figure 8As shown, a first limiting portion 17 is provided between the fixed cavity 14 and the air inlet cavity 13, and a second limiting portion 18 is provided between the fixed cavity 14 and the air duct 15. The buffer sleeve 33 also includes a rim portion 333 connecting the two ends of the buffer sleeve 33. The rim portion 333 at one end isolates and buffers the end of the cylinder 21 and the first limiting portion 17, and the rim portion 333 at the other end isolates and buffers the end of the cylinder 21 and the second limiting portion 18. The rim portion 333 further provides buffering and shock absorption capabilities for the brake assembly, further reducing the noise generated by the brake assembly. In addition, the cooperation between the first limiting portion 17, the second limiting portion 18 and the rim portions 333 at both ends further limits the axial movement of the brake assembly, so that the brake assembly is firmly fixed to the fixed cavity 14, and the brake assembly can generate wind stably, continuously and quietly. The material of the buffer sleeve 33 can be silicone, foam, or other materials with buffering capabilities, which are not limited to the examples. Of course, in other embodiments, the brake assembly may not be provided with the buffer sleeve 33 .

[0041] In one embodiment, Figure 2 、 Figure 3 、 Figure 7 and Figure 8 As shown, the cylinder 21 includes an outer ring portion 211, an inner ring portion 212, and a plurality of connecting blades 213 connecting the outer ring portion 211 and the inner ring portion 212. The inner ring portion 212 is provided on the side of the outer ring portion 211 close to the air duct 15, and the inner ring portion 212 is slightly protruded toward the air duct 15. Therefore, the side of the outer ring portion 211 facing the air inlet chamber 13 has more space for arranging other structures, and the space layout within the cylinder 21 is reasonable. A base plate 214 is provided within the inner ring portion 212, and a hollow shaft barrel 215 extends axially from the base plate 214 toward the air inlet chamber 13. The rotor assembly 23 includes a rotating shaft 231, a bearing 232, and a magnetic ring 233. The rotating shaft 231 and at least one bearing 232 are provided in the shaft barrel 215. In this embodiment, the number of the bearings 232 is two, and both bearings 232 are provided in the shaft barrel 215. Of course, one of the two bearings 232 may be disposed inside the shaft cylinder 215, while the other may be disposed outside the shaft cylinder 215, as long as a secure fit between the rotating shaft 231 and the shaft cylinder 215 is ensured. The stator assembly 22 is disposed radially outward of the rotating shaft 231 and the shaft cylinder 215, and the magnetic ring 233 is disposed radially outward of the stator assembly 22. The fan 3 is disposed on a side of the outer ring portion 211 that is close to the air inlet chamber 13, and the fan 3 is fixed to the rotating shaft 231.

[0042] In one embodiment, as shown in FIG. Figure 2 、 Figure 3、 Figure 7 and Figure 8 As shown, the rotor assembly 23 also includes a housing 234, which is sleeved outside the magnetic ring 233 and tightly fits the rotating shaft 231. The fan 3 is fixed to the rotating shaft 231 and is coaxially arranged with the motor 2. The fan 3 and the housing 234 are coaxially arranged. The stator assembly 22 generates a magnetic field, causing the magnetic ring 233 and the housing 234 to rotate, and the housing 234 drives the rotating shaft 231 and the fan 3 to rotate simultaneously. This eliminates the need for additional transmission devices on the motor 2 and the fan 3, effectively improving the transmission efficiency of the neck-hanging fan.

[0043] In one embodiment, Figure 2 、 Figure 3 、 Figure 7 and Figure 8 As shown, the fan 3 includes a hub 31 and a plurality of blades 32 arranged at intervals around the outside of the hub 31. The difference between any two of the diameter of the maximum cross-section of the hub 31, the diameter of the housing 234, and the diameter of the inner ring portion 212 is less than 2 mm. The wind generated by the plurality of blades 32 can smoothly pass through the area between the housing 234 and the outer ring portion 211, and the area between the inner ring portion 212 and the outer ring portion 211, and blow toward the air duct 15. The hub 31, the housing 234, and the inner ring portion 212 are axially arranged, and the diameters of the three are similar, so that the motor 2 and the fan 3 have a compact structure.

[0044] In one embodiment, Figure 2 、 Figure 3 、 Figure 7 and Figure 8 As shown, the inner ring portion 212 is formed with a receiving portion 216 on the side of the base plate 214 facing the air duct 15. The drive plate 24 is disposed in the receiving portion 216, and the control member 42 is electrically connected to the drive plate 24. The receiving portion 216 is directly formed by the inner ring portion 212, that is, the drive plate 24 is directly fixed to the inner ring portion 212 and is disposed toward the air duct 15, facilitating the connection between the drive plate 24 and other electrical components. The base plate 214 also has a notch, through which a wire electrically connects the stator assembly 22 and the drive plate 24.

[0045] In one embodiment, Figure 2 、 Figure 3 、 Figure 7 and Figure 8As shown, both free ends of the housing 1 are provided with a receiving cavity 16. The neck-hanging fan further includes a control assembly, which includes a power supply 41 for providing power to the brake assembly, and a control component 42 for controlling the brake assembly. The power supply 41 is electrically connected to the control component 42, which is in turn electrically connected to the drive board 24. The power supply 41 and the control component 42 are housed in the receiving cavity 16. The control component 42 includes a switch 43 and an interface 44, which are exposed outside the free end of the housing 1.

[0046] It should be understood that in this embodiment, the air inlet cavity 13, the fixed cavity 14, the air duct 15, and the accommodating cavity 16 are sequentially provided along the length direction of the housing 1. Of course, in other embodiments, the air inlet cavity 13, the fixed cavity 14, and the air duct 15 may be sequentially provided along the length direction of the housing 1, and the accommodating cavity 16 may be provided on one side of the air inlet cavity 13 or on one side of the air duct 15.

[0047] In one embodiment, Figures 1 to 4 As shown, the portable fan is a neck-hanging fan, and the shell 1 is symmetrically provided with two air inlet chambers 13, two fixed chambers 14 and two air ducts 15, and the two brake assemblies are respectively provided in the two fixed chambers 14. The air outlet 12 is worn upward, and the wind generated by the brake assembly blows toward the user's head, and the air suction port 1d can accelerate the air flow near the neck by sucking in the air, which has a sweat-absorbing effect. Alternatively, the air outlet 12 is worn downward, and the wind in the brake assembly blows toward the user's neck, and the air suction port 1d can accelerate the air flow near the head by sucking in the air, which has a sweat-absorbing effect. In other embodiments, the portable fan can also be a handheld fan, a clip fan, a versatile fan or other portable fans, which are not limited to the examples.

[0048] The above detailed description is only an illustration of the preferred embodiment of the present application, and does not limit the patent scope of the present application. Therefore, all equivalent technical changes made by using the description and illustrations of this invention are included in the patent scope of this invention.

Claims

1. A portable fan, characterized in that: include: The housing is provided with an air inlet cavity, a fixed cavity and an air duct in sequence along the length direction. The housing is also provided with an air inlet and an air outlet, the air inlet is connected to the air inlet cavity, and the air outlet is connected to the air duct; a brake assembly housed in the fixed cavity, the brake assembly sucking air from the air inlet, passing through the air inlet cavity, the brake assembly and the air duct, and finally blowing air out from the air outlet; The air outlet is arranged along the length direction of the air duct, the shell has an inner surface and an outer surface, the air outlet is defined by the inner surface and the outer surface, and the inner surface and the outer surface are close to or overlap each other at the air outlet.

2. The portable fan according to claim 1, wherein: The air outlet has an outlet, and at the outlet of the air outlet, the interval between the inner surface and the outer surface is in the range of 1-5 mm.

3. The portable fan according to claim 1, wherein: The shell includes a first wall and a second wall, the first side of the first wall is closed and connected to the first side of the second wall, the second side of the first wall is opposite to and spaced from the second side of the second wall, and the outer surface of the first wall and the inner surface of the second wall define the air outlet.

4. The portable fan according to claim 3, wherein: The first side of the first wall and the second side of the first wall extend in the same direction, and the second side of the first wall extends beyond the first side of the first wall; the first side of the second wall and the second side of the second wall extend in the same direction, and the second side of the second wall extends beyond the first side of the second wall; the depth of the air outlet is 15-23 mm.

5. The portable fan according to claim 3, wherein: It also includes a plurality of guide members, which are spaced apart along the length direction of the air duct. The guide members are used to guide the wind generated by the brake assembly to blow toward the air outlet, and the guide members abut against the first wall and the second wall at the same time.

6. The portable fan according to claim 1, wherein: The brake assembly includes a motor and a fan. The motor includes a cylinder, a stator assembly and a rotor assembly. The motor is a three-phase high-speed motor. At least a portion of the fan is disposed in the cylinder.

7. The portable fan according to claim 6, wherein: The cylinder body includes an outer ring portion, an inner ring portion, and a plurality of connecting blades connecting the outer ring portion and the inner ring portion. The inner ring portion is arranged on a side of the outer ring portion close to the air duct. A base plate is provided in the inner ring portion, and a hollow shaft cylinder extends axially from the base plate toward the air inlet chamber. The rotor assembly includes a rotating shaft, a bearing and a magnetic ring. The rotating shaft and at least one bearing are arranged in the shaft cylinder, the stator assembly is arranged on the radial outside of the rotating shaft and the shaft cylinder, and the magnetic ring is arranged on the radial outside of the stator assembly; the fan is arranged on a side of the outer ring portion close to the air inlet chamber, and the fan is fixed on the rotating shaft.

8. The portable fan according to claim 7, wherein: It also includes a control component, which includes a power supply for providing power to the brake component and a control component for controlling the brake component, and the power supply is electrically connected to the control component; the shell is provided with the air inlet chamber, the fixed chamber, the air duct and the accommodating chamber along the length direction, the control component is accommodated in the accommodating chamber, and the control component includes a switch and an interface exposed outside the shell; the inner ring portion is formed with a accommodating portion on the side of the substrate facing the air duct, the drive plate is provided in the accommodating portion, the control component is electrically connected to the drive plate, and the substrate is also provided with a notch, and the wire is electrically connected to the stator assembly and the drive plate via the notch.

9. The portable fan according to claim 1, wherein: The length of the air duct is 4-6 times the length of the air inlet cavity, the maximum cross-sectional area of ​​the air duct is smaller than the minimum cross-sectional area of ​​the air inlet cavity, the maximum cross-sectional area of ​​the fixed cavity is less than or equal to the minimum cross-sectional area of ​​the air inlet cavity, and the minimum cross-sectional area of ​​the fixed cavity is greater than or equal to the maximum cross-sectional area of ​​the air duct.

10. The portable fan according to claim 1, wherein: The portion of the shell in the fixed cavity is cylindrical, the diameter of the portion of the shell in the fixed cavity is 28-35 mm, and the length of the shell in the fixed cavity is 30-40 mm.

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