Neck-hung fan

Abstract

The utility model provides a neck-hanging fan which comprises a shell, at least three fixing cavities, air inlet cavities and air channels, the air inlet cavities and the air channels are correspondingly arranged at the two ends of each fixing cavity, an air inlet is formed in the position corresponding to each air inlet cavity, and an air outlet is formed in the position corresponding to each air channel; each braking assembly is correspondingly arranged in the corresponding fixing cavity, each braking assembly sucks air from the corresponding air inlet, and the air is blown out from the corresponding air outlet after passing through the corresponding air inlet cavity, the braking assembly and the air duct; wherein each brake assembly comprises a motor and a fan, the motor comprises a barrel, a stator assembly and a rotor assembly, at least part of the fan is arranged in the barrel, the fan comprises a hub and a plurality of blades arranged on the outer side of the hub in a surrounding mode at intervals, and at least part of the hub radially increases and extends in the direction from the air inlet cavity to the air duct. By arranging at least three brake assemblies, the overall wind power and air outlet range of the neck-hanging fan are increased, meanwhile, the length of an air duct can be shortened, and air is evenly discharged.

Description

Technical Field

[0001] The present application relates to the technical field of fans, and in particular to a neck-hanging 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] To expand the airflow range, current neck-hanging fans typically feature outlets throughout the entire neck-encircling area. This allows airflow from the neck-encircling area to flow directly toward the neck, enhancing cooling. However, these outlets extend along the length of the neck-hanging fan, resulting in significant differences in wind speed between outlets closer to the fan and those farther away, resulting in a poor user experience. Summary of the Invention

[0004] In view of this, the present application provides a neck-hanging fan, which increases the air outlet range of the neck-hanging fan by setting at least three brake components, and at the same time can shorten the length of the air duct and evenly discharge air.

[0005] The present application provides a neck-hanging fan, comprising: a shell, provided with at least three fixed cavities, and an air inlet cavity and an air duct corresponding to the two ends of each fixed cavity, an air inlet corresponding to each air inlet cavity, and an air outlet corresponding to each air duct; at least three brake assemblies, one brake assembly corresponding to one of the fixed cavities, each of the brake assemblies sucking air from the corresponding air inlet, passing through the corresponding air inlet cavity, the brake assembly and the air duct, and then blowing it out from the corresponding air outlet; wherein each of the brake assemblies comprises a motor and a fan, the motor comprises a cylinder, a stator assembly and a rotor assembly, at least a portion of the fan is arranged in the cylinder, the fan comprises a hub and a plurality of blades spaced around the outside of the hub, and at least a portion of the hub radially increases and extends from the air inlet cavity toward the air duct.

[0006] Furthermore, the shell is provided with four fixed cavities, and the air inlet cavity and the air duct are correspondingly provided at both ends of each of the fixed cavities, and the four brake assemblies are correspondingly provided in the four fixed cavities.

[0007] Furthermore, the structure of the air inlet cavity, the fixed cavity and the air duct is defined as a main structure, the two main structures on the left side of the shell are arranged in non-unidirectional directions along the length direction of the shell, and the two main structures on the right side of the shell are arranged in non-unidirectional directions along the length direction of the shell, and in the main structure located at the free end of the shell, the air duct is closer to the free end of the shell than the air inlet cavity, or the air inlet cavity is closer to the free end of the shell than the air duct.

[0008] Furthermore, the structure of the air inlet cavity, the fixed cavity and the air duct is defined as a main structure, the two main structures on the left side of the shell are arranged in the same direction along the length direction of the shell, and the two main structures on the right side of the shell are arranged in the same direction along the length direction of the shell, and in the main structure located at the free end of the shell, the air duct is closer to the free end of the shell than the air inlet cavity, or the air inlet cavity is closer to the free end of the shell than the air duct.

[0009] Furthermore, the shell includes a first part on the left side and a second part on the right side, the first part and the second part are two detachable parts, and the first part and the second part are fixedly connected or pivotally connected; a partition is provided in the first part and / or the second part, and the partition is used to separate the two main structures.

[0010] Furthermore, the shell includes a first part and a third part on the left side, and a second part and a fourth part on the right side. The third part, the first part, the second part and the fourth part are four parts that are detachably connected. Among the third part, the first part, the second part and the fourth part, two adjacent parts are fixedly connected or pivotally connected.

[0011] Furthermore, the shell is provided with three fixed cavities, and the air inlet cavity and the air duct are correspondingly provided at two ends of each of the fixed cavities, and the three brake assemblies are correspondingly provided in the three fixed cavities.

[0012] Furthermore, the structure of the air inlet cavity, the fixed cavity and the air duct is defined as a main structure, and at least one partition is provided in the shell, and the partition is used to separate two adjacent main structures.

[0013] Furthermore, the shell includes a first part, a second part and a third part arranged along the length direction, the first part, the second part and the third part are three detachable parts, and the adjacent two of the first part, the second part and the third part are fixedly connected or pivotally connected.

[0014] Furthermore, the fan is a diagonal flow fan or an axial flow fan; the cylinder 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, a hollow shaft cylinder is extended axially from the base plate toward the air inlet cavity, the stator assembly, the rotor assembly and the fan are all arranged on a side of the base plate facing the air inlet cavity and installed on the shaft cylinder, the inner ring portion is formed with a receiving portion on the side of the base plate facing the air duct, and a driving plate Located in the accommodating portion, the substrate is provided with a notch, and a wire electrically connects the stator assembly and the drive board via the notch; it also includes a control assembly, the control assembly includes a power supply for providing power to the brake assembly, and a control component for controlling the brake assembly, the power supply is electrically connected to the control component, and the control component is electrically connected to the drive board, at least one free end of the shell is provided with a accommodating cavity, the power supply and the control component are accommodated in the accommodating cavity, and the control component includes a switch and an interface exposed outside the free end of the shell.

[0015] Compared with the prior art, the neck-hanging fan of the present application has the following beneficial effects: by setting at least three of the brake assemblies, the number of wind-generating elements is increased, thereby increasing the overall wind force and air outlet range of the neck-hanging fan; at the same time, the space for setting the brake assembly is increased in the shell surrounding the neck, and the length of the air duct is shortened accordingly, so that the air outlet of each brake assembly is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the neck-hanging fan of the present application;

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

[0018] Figure 3 This is a partial exploded view of the neck-hanging fan of the present application;

[0019] Figure 4 is a cross-sectional view of another embodiment of the neck-hanging fan of the present application;

[0020] Figure 5 is a cross-sectional view of another embodiment of the neck-hanging fan of the present application;

[0021] Figure 6 is a cross-sectional view of another embodiment of the neck-hanging fan of the present application;

[0022] Figure 7 is a cross-sectional view of another embodiment of the neck-hanging fan of the present application;

[0023] Figure 8 is a cross-sectional view of another embodiment of the neck-hanging fan of the present application;

[0024] Figure 9 yes Figure 2 Enlarged view of part C;

[0025] Figure 10 It is a cross-sectional view of the brake assembly of the present application. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] In one embodiment, Figure 1 and Figure 2 The figure shows a schematic diagram of the neck-hanging fan of the present application, and the neck-hanging fan is in a "C" shape or a "U" shape as a whole. The neck-hanging fan includes a shell 1, a brake assembly and a control assembly. The shell 1 is provided with four fixed cavities 14, and an air inlet cavity 13 and an air duct 15 corresponding to the two ends of each of the fixed cavities 14. An air inlet 11 is provided corresponding to each of the air inlet cavities 13, and an air outlet 12 is provided corresponding to each of the air ducts 15. Four brake assemblies are provided in the neck-hanging fan, and one brake assembly is provided corresponding to one of the fixed cavities 14. Each of the brake assemblies draws in wind from the corresponding air inlet 11, passes through the corresponding air inlet cavity 13, the brake assembly and the air duct 15, and then blows out from the corresponding air outlet 12.

[0031] In one embodiment, Figures 1 to 3As shown, the structure of the air inlet cavity 13, the fixed cavity 14 and the air duct 15 is defined as a main structure 1A. The two main structures 1A on the left side of the shell 1 are arranged in non-coordinate directions along the length direction of the shell 1, and the two main structures 1A on the right side of the shell 1 are arranged in non-coordinate directions along the length direction of the shell 1. In this embodiment, the non-coordinate settings are adjacent to each other, and the two air ducts 15 are connected. In the main structure 1A located at the free end of the shell 1, the air inlet cavity 13 is closer to the free end of the shell 1 than the air duct 15. In another embodiment, as Figure 5 As shown, the air duct 15 may be closer to the free end of the shell 1 than the air inlet cavity 13. In this embodiment, they are not arranged in the same direction, that is, they are arranged relative to each other, and the two air inlet cavities are arranged adjacent to each other. In other embodiments, in the main structure 1A on one side, the air duct 15 is closer to the free end of the shell 1 than the air inlet cavity 13, and in the main structure 1A on the other side, the air inlet cavity 13 is closer to the free end of the shell 1 than the air duct 15.

[0032] In one embodiment, Figure 6 As shown, the structure of the air inlet cavity 13, the fixed cavity 14 and the air duct 15 is defined as a main structure 1A. The shell 1 has four main structures 1A. The two main structures 1A on the left side of the shell 1 are arranged in the same direction along the length direction of the shell 1, and the two main structures 1A on the right side of the shell 1 are arranged in the same direction along the length direction of the shell 1. Moreover, in the main structure 1A located at the free end of the shell 1, the air duct 15 is closer to the free end of the shell 1 than the air inlet cavity 13. In another embodiment, as Figure 7 As shown, the air inlet cavity 13 may be closer to the free end of the housing 1 than the air duct 15. In other embodiments, the air duct 15 may be closer to the free end of the housing 1 than the air inlet cavity 13 in the main structure 1A on one side, and the air inlet cavity 13 may be closer to the free end of the housing 1 than the air duct 15 in the main structure 1A on the other side.

[0033] In some embodiments, as Figure 2 and Figure 4 As shown, the housing 1 includes a first portion 1a on the left and a second portion 1b on the right. The first portion 1a and the second portion 1b are detachable. The first portion 1a and the second portion 1b are pivotally connected. In other embodiments, the first portion 1a and the second portion 1b may also be fixedly connected. In one embodiment, as Figure 4As shown, a partition 1B is provided in the first part 1a and the second part 1b, and the partition 1B is used to separate the two main structures 1A. In addition, the partition 1B may be provided in one of the first part 1a and the second part 1b, or the partition 1B may not be provided in either the first part 1a or the second part 1b.

[0034] In other embodiments, the housing 1 may include a first portion 1a and a third portion on the left side, and a second portion 1b and a fourth portion on the right side, wherein the third portion, the first portion 1a, the second portion 1b, and the fourth portion are detachably connected, and two adjacent portions of the third portion, the first portion 1a, the second portion 1b, and the fourth portion are fixedly connected or pivotally connected. Alternatively, at least two of the third portion, the first portion 1a, the second portion 1b, and the fourth portion are detachably connected, and may be fixedly connected or pivotally connected.

[0035] In one embodiment, the housing 1 is provided with three fixed cavities 14, and the air inlet cavity 13 and the air duct 15 are correspondingly provided at both ends of each fixed cavity 14. Three brake assemblies are provided in each of the three fixed cavities 14. Each brake assembly draws air from the corresponding air inlet 11, passes through the corresponding air inlet cavity 13, the brake assembly, and the air duct 15, and then blows air out of the corresponding air outlet 12. The air inlet cavity 13, the fixed cavity 14, and the air duct 15 are defined as a main structure 1A. At least one partition 1B is provided within the housing 1. The partition 1B is used to separate two adjacent main structures 1A.

[0036] In one embodiment, the shell 1 includes a first part 1a, a second part 1b and a third part arranged along the length direction, the first part 1a, the second part 1b and the third part are three detachable parts, and the first part 1a, the second part 1b and the third part are fixedly connected or pivotally connected between adjacent two parts.

[0037] In one embodiment, Figures 1 to 3As 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.

[0038] In one embodiment, Figures 1 to 3 As 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.

[0039] In one embodiment, Figure 2 、 Figure 3 、 Figure 9 and Figure 10 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.

[0040] In one embodiment, Figure 3 、 Figure 9 and Figure 10As 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 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.

[0041] In one embodiment, Figure 2 、 Figure 3 、 Figure 9 and Figure 10 As 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 .

[0042] In one embodiment, Figure 2 、 Figure 9 and Figure 10As 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.

[0043] In one embodiment, Figure 9 and Figure 10 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.

[0044] In one embodiment, Figure 9 and Figure 10As 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.

[0045] In one embodiment, Figure 3 、 Figure 9 and Figure 10 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.

[0046] In one embodiment, Figure 8 As shown, the cavity also includes a accommodating chamber 16 and an extension 19. The control assembly includes a power supply 41 for providing power to the brake assembly, and a control member 42 for controlling the brake assembly. The power supply 41 is electrically connected to the control member 42, and the control member 42 is electrically connected to the drive plate 24. The extension 19 is arranged in parallel with the accommodating chamber 16. The maximum cross-sectional diameter of the extension 19 and the accommodating chamber 16 is less than 36.5 mm. Therefore, even if the extension 19 is arranged in parallel with the accommodating chamber 16, the cross-sectional area of the extension 19 and the accommodating chamber 16 is still small, and the overall volume of the neck hanging fan is still small. The extension 19 is connected to the air duct 15, and the housing 1 is also provided with an air outlet 12 connected to the extension 19. The brake assembly draws air in through the air inlet 11. Part of the air passes through the air inlet cavity 13, the brake assembly, and the air duct 15 before being blown out of the air outlet 12. Part of the air passes through the air inlet cavity 13, the fixed cavity 14, the air duct 15, and the extension 19 before being blown out of the air outlet 12. The provision of the extension 19 and the air outlet 12 extends the air outlet range of the neck-hanging fan, improving the user experience.

[0047] In one embodiment, at least one of the two free ends of the housing 1 may be provided with a receiving cavity 16. 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 exposed from the free end of the housing 1. In other embodiments, the housing 1 may not be provided with the receiving cavity 16, and the neck-hanging fan may not be provided with the power supply 41. Instead, the fan may be directly connected to an external power source via the interface 44 for power supply.

[0048] In other embodiments, the shell 1 may also be provided with more than four fixed cavities 14, and the air inlet cavity 13 and the air duct 15 correspondingly provided at both ends of each fixed cavity 14, and more than four braking assemblies correspondingly provided in more than four fixed cavities 14.

[0049] By setting up at least three of the brake assemblies, the wind-generating elements are fundamentally increased, thereby increasing the overall wind force and air outlet range of the neck-hanging fan; at the same time, the space for setting up the brake assemblies is increased in the shell 1 surrounding the neck, and the length of the air duct is shortened accordingly, so that the air outlet of each brake assembly is more uniform.

[0050] 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 neck hanging fan, characterized in that: include: The housing is provided with at least three fixed cavities, and an air inlet cavity and an air duct corresponding to the two ends of each of the fixed cavities, an air inlet corresponding to each of the air inlet cavities, and an air outlet corresponding to each of the air ducts; At least three brake assemblies, one brake assembly corresponding to one of the fixed cavities, each brake assembly sucking air from the corresponding air inlet, passing through the corresponding air inlet cavity, the brake assembly and the air duct, and finally blowing air out from the corresponding air outlet; Wherein, each of the brake components includes a motor and a fan, the motor includes a cylinder, a stator assembly and a rotor assembly, at least a portion of the fan is disposed within the cylinder, the fan includes a hub and a plurality of blades spaced around the outside of the hub, and at least a portion of the hub radially increases and extends from the air inlet cavity toward the air duct.

2. The neck hanging fan according to claim 1, characterized in that: The shell is provided with four fixed cavities, and the air inlet cavity and the air duct are correspondingly provided at two ends of each of the fixed cavities, and the four brake assemblies are correspondingly provided in the four fixed cavities.

3. The neck hanging fan according to claim 2, characterized in that: The structure of the air inlet cavity, the fixed cavity and the air duct is defined as a main structure, the two main structures on the left side of the shell are arranged in non-unidirectional directions along the length direction of the shell, and the two main structures on the right side of the shell are arranged in non-unidirectional directions along the length direction of the shell, and are located in the main structure at the free end of the shell, the air duct is closer to the free end of the shell than the air inlet cavity, or the air inlet cavity is closer to the free end of the shell than the air duct.

4. The neck hanging fan according to claim 2, characterized in that: The structure of the air inlet cavity, the fixed cavity and the air duct is defined as a main structure, the two main structures on the left side of the shell are arranged in the same direction along the length direction of the shell, and the two main structures on the right side of the shell are arranged in the same direction along the length direction of the shell, and are located in the main structure at the free end of the shell, the air duct is closer to the free end of the shell than the air inlet cavity, or the air inlet cavity is closer to the free end of the shell than the air duct.

5. The neck hanging fan according to claim 3 or 4, characterized in that: The shell includes a first part on the left side and a second part on the right side, the first part and the second part are detachable parts, and the first part and the second part are fixedly connected or pivotally connected; a partition is provided in the first part and / or the second part, and the partition is used to separate the two main structures.

6. The neck hanging fan according to claim 3 or 4, characterized in that: The shell includes a first part and a third part on the left side, and a second part and a fourth part on the right side. The third part, the first part, the second part and the fourth part are four detachably connected parts. Among the third part, the first part, the second part and the fourth part, two adjacent parts are fixedly connected or pivotally connected.

7. The neck hanging fan according to claim 1, characterized in that: The shell is provided with three fixed cavities, and the air inlet cavity and the air duct are correspondingly provided at two ends of each of the fixed cavities, and the three brake assemblies are correspondingly provided in the three fixed cavities.

8. The neck hanging fan according to claim 7, characterized in that: The structure of the air inlet cavity, the fixed cavity and the air duct is defined as a main structure. At least one partition is provided in the shell, and the partition is used to separate two adjacent main structures.

9. The neck hanging fan according to claim 7, characterized in that: The shell includes a first part, a second part and a third part arranged along the length direction. The first part, the second part and the third part are three detachable parts. Among the first part, the second part and the third part, adjacent two parts are fixedly connected or pivotally connected.

10. The neck hanging fan according to claim 1, characterized in that: The fan is a diagonal flow fan or an axial flow fan; the cylinder 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, a hollow shaft cylinder is extended axially from the base plate toward the air inlet cavity, the stator assembly, the rotor assembly and the fan are all arranged on a side of the base plate facing the air inlet cavity and are installed on the shaft cylinder, the inner ring portion is formed with a receiving portion on the side of the base plate facing the air duct, and a drive plate is provided The housing portion and the substrate are provided with a notch, and a wire electrically connects the stator assembly and the drive board via the notch; it also includes a control assembly, the control assembly includes a power supply for providing power to the brake assembly, and a control assembly for controlling the brake assembly, the power supply is electrically connected to the control assembly, and the control assembly is electrically connected to the drive board, at least one free end of the shell is provided with a housing cavity, the power supply and the control assembly are accommodated in the housing cavity, and the control assembly includes a switch and an interface exposed outside the free end of the shell.

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