Neck-mounted fan

Abstract

A neck-mounted fan, comprising a support (1). The support (1) is configured to be wearable on a human neck. The support (1) comprises housings (10) respectively located on two sides of the human neck. An air duct (11) and a fan assembly (2) are provided inside each housing (10), an air inlet (12) and an air outlet (13) are provided on the housing (10), and the air inlet (12) and the air outlet (13) are both in communication with the air duct (11).

Description

Neck fan

[0001] This application claims priority to Chinese patent applications filed on December 12, 2024, with application numbers 202423090648.0, 202423090877.2, 202423076797.1 and 202423076655.5, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of fan technology, such as a neck fan. Background Technology

[0003] A neck fan is a wearable device that blows air onto the user's neck to cool them down. Furthermore, the neck fan moves with the user, freeing their hands.

[0004] Neck-hanging fans in related technologies typically include a bracket on which a bare or semi-bare fan is directly mounted. The fan blades rotate, pushing airflow to generate a breeze directed towards the user's neck and face. However, neck-hanging fans in these technologies have the following drawbacks: the airflow generated by the fan is usually radial and scattered, with a lack of focused airflow, resulting in a relatively small effective airflow felt by the user and poor cooling effect. Summary of the Invention

[0005] This application provides a neck fan that increases the effective airflow perceived by the user, improves cooling efficiency, provides a better cooling experience, and enhances the safety of using the neck fan.

[0006] The following technical solution is adopted in this application:

[0007] A neck fan is provided, including a support frame configured to be worn around the neck of a person, the support frame including housings located on both sides of the neck;

[0008] The housing contains an air duct and a fan assembly. The housing has an air inlet and an air outlet, both of which are connected to the air duct. The inner wall of the air duct has a smooth inner surface without any protrusions.

[0009] As an optional embodiment of the neck fan in this application, the housing is provided with a hollow inner liner, the inner liner extends along the length of the housing, and the air duct is defined in the inner liner;

[0010] The air outlet includes a first air outlet disposed on the housing and a second air outlet disposed on the inner liner and connected to the air duct, wherein the first air outlet and the second air outlet are connected.

[0011] As an optional embodiment of the neck fan in this application, the inner wall of the air duct has a smooth inner surface without protrusions.

[0012] As an optional embodiment of the neck fan in this application, the outer surface of the inner liner is provided with a wind-gathering part, and the wind-gathering part is provided with a trumpet-shaped first wind-gathering cavity, the cross-section of the first wind-gathering cavity being proportionally reduced along the airflow direction; the second air outlet is provided on the wind-gathering part, and the air duct, the first wind-gathering cavity, and the second air outlet are connected in sequence.

[0013] As an optional embodiment of the neck fan in this application, a first air guide plate is provided inside the housing, and the air duct is formed between the first air guide plate and the inner wall of the housing.

[0014] As an alternative to the neck fan of this application, the housing includes a front section and a rear section extending along its length, the rear section being close to the rear side of the human neck, and the fan assembly being located inside the rear section of the housing;

[0015] The rear section is provided with an air inlet chamber, the front section is provided with an air delivery chamber, the air duct includes the air inlet chamber and the air delivery chamber, the air inlet, the air inlet chamber, the air delivery chamber and the air outlet are connected in sequence, and the fan assembly delivers the air in the air inlet chamber forward to the air delivery chamber.

[0016] As an optional embodiment of the neck fan in this application, a second air guide plate extending at an angle is provided in the front section, and the second air guide plate and the inner wall of the front section form the air delivery cavity.

[0017] As an optional embodiment of the neck fan in this application, a plurality of third air guide plates are distributed at intervals along the airflow direction in the air delivery cavity, and the third air guide plates are located below the air outlet.

[0018] As an optional embodiment of the neck fan in this application, the air inlet includes a first air inlet, which is located on the outer surface of the rear section away from the human neck.

[0019] As an optional embodiment of the neck fan in this application, the air inlet includes a second air inlet, which is disposed on the outer surface of the rear section facing the human neck.

[0020] As an optional solution for the neck fan in this application, the two housings of the bracket are a first housing and a second housing, the first housing has a first air duct, the second housing has a second air duct, and the first air duct and the second air duct are connected to form a U-shaped air duct;

[0021] At least three fan assemblies are arranged at intervals within the U-shaped duct, and the at least three fan assemblies drive the air in the U-shaped duct to flow from one end of the U-shaped duct to the other end.

[0022] As an optional embodiment of the neck fan in this application, in the air outlet direction, the projections of the air outlet and the corresponding fan assembly do not overlap.

[0023] As an optional embodiment of the neck fan in this application, the first housing and the second housing are connected by a connecting part, and the three fan assemblies are a first fan assembly, a second fan assembly and a third fan assembly. The first fan assembly is close to the air inlet, the second fan assembly is located in the first air duct near the connecting part, and the third fan assembly is located in the second air duct near the connecting part.

[0024] As an optional embodiment of the neck fan of this application, the housing is provided with an outer air guide plate and an inner air guide plate. Both the outer air guide plate and the inner air guide plate extend along the length direction of the housing. The inner air guide plate extends into the lower part of the outer air guide plate and maintains a distance from the outer air guide plate to form an air guide gap. The air guide gap is connected to the air duct, and the end of the air guide gap away from the air duct forms the air outlet, which faces the neck or head of the human body.

[0025] As an optional embodiment of the neck fan in this application, both the outer air guide plate and the inner air guide plate are provided with air guiding surfaces on the side facing each other, and the air guiding gap is defined between the two air guiding surfaces.

[0026] As an optional embodiment of the neck fan in this application, the air guide gaps on the two housings are connected.

[0027] As an optional embodiment of the neck fan in this application, the width d2 of the air guide gap is 1mm to 5mm;

[0028] And / or, the depth h of the air guide gap is 3mm to 10mm.

[0029] As an optional embodiment of the neck fan in this application, a horn-shaped second air-gathering cavity is provided between the fan assembly and the air duct. The larger end of the second air-gathering cavity is close to the fan assembly, and the smaller end of the second air-gathering cavity is connected to the air duct.

[0030] As an optional embodiment of the neck fan in this application, the housing is provided with a guide plate. The guide plate includes a first guide section and a second guide section distributed along the airflow direction. The first guide section and the inner wall of the housing form a second air-gathering cavity. The second guide section, the outer air guide plate, and the inner air guide plate form the air duct.

[0031] As an optional embodiment of the neck fan in this application, the cross-section of the air duct is reduced proportionally along the airflow direction.

[0032] As an optional embodiment of the neck fan in this application, the air duct extends in an arc shape along the length of the housing, and the arc of the air duct is 15° to 345°.

[0033] As an optional embodiment of the neck fan of this application, the air outlet includes a single strip-shaped hole extending along the length direction of the housing; or, the air outlet includes multiple strip-shaped holes spaced apart along the length direction of the housing; or, the air outlet includes multiple air outlet holes distributed in an array.

[0034] As an optional embodiment of the neck fan in this application, the fan assembly includes an air guide tube, a first impeller, a second impeller, and a motor. The first impeller is disposed inside the air guide tube, and the output end of the motor is connected to the first impeller to drive the first impeller to rotate. The second impeller is disposed inside the air guide tube and is arranged at a distance from the first impeller. The first blade on the first impeller and the second blade on the second impeller have opposite spiral directions.

[0035] The technical effects of this application are as follows:

[0036] The neck fan provided in this application, when the fan assembly is working, draws air into the air duct through the air inlet and blows it out through the air outlet, thereby driving airflow around the neck and producing a cooling sensation. By incorporating an independent air duct within the bracket's housing, the airflow generated by the fan assembly can be guided and constrained, resulting in a more concentrated and powerful airflow from the air outlet. This airflow is precisely directed to key cooling areas of the neck or head, avoiding wasted airflow and effectively improving perceived wind speed and cooling efficiency, providing users with a better cooling experience. Simultaneously, the air duct helps to streamline the airflow generated by the fan assembly, making it smoother and reducing noise. Furthermore, since the fan assembly is located inside the housing, it not only isolates some of the noise generated by the fan assembly but also prevents hair, clothing, and other debris from being caught in the housing, improving the safety of using the neck fan. Attached Figure Description

[0037] Figure 1 is a structural schematic diagram of the neck fan provided in Embodiment 1 of this application;

[0038] Figure 2 is a schematic diagram of the internal structure of the neck fan provided in Embodiment 1 of this application;

[0039] Figure 3 is a schematic diagram of the inner liner of the neck fan provided in Embodiment 1 of this application;

[0040] Figure 4 is a top view of the inner liner of the neck fan provided in Embodiment 1 of this application;

[0041] Figure 5 is a cross-sectional view at point AA in Figure 4;

[0042] Figure 6 is a structural schematic diagram of the fan assembly provided in a specific embodiment of this application;

[0043] Figure 7 is an exploded view of the fan assembly provided in a specific embodiment of this application;

[0044] Figure 8 is a structural schematic diagram of the neck fan provided in Embodiment 2 of this application;

[0045] Figure 9 is a cross-sectional view of the neck fan provided in Embodiment 2 of this application;

[0046] Figure 10 is a schematic diagram of the internal structure provided in Embodiment 2 of this application;

[0047] Figure 11 is a side view of Figure 10;

[0048] Figure 12 is a structural schematic diagram of the neck fan provided in Embodiment 3 of this application;

[0049] Figure 13 is a schematic diagram of the internal structure of the neck fan provided in Embodiment 3 of this application;

[0050] Figure 14 is a first top view of the neck fan provided in Embodiment 3 of this application;

[0051] Figure 15 is a second top view of the neck fan provided in Embodiment 3 of this application;

[0052] Figure 16 is a structural schematic diagram of the neck fan provided in Embodiment 4 of this application;

[0053] Figure 17 is a first top view of the neck fan provided in Embodiment 4 of this application;

[0054] Figure 18 is a cross-sectional view at point BB in Figure 17;

[0055] Figure 19 is a schematic diagram of the internal structure of the neck fan provided in Embodiment 4 of this application;

[0056] Figure 20 is a second top view of the neck fan provided in Embodiment 4 of this application;

[0057] Figure 21 is a cross-sectional view at point CC in Figure 20.

[0058] In the picture:

[0059] 1. Bracket; 2. Fan assembly; 3. Inner chamber;

[0060] 10. Housing; 11. Air duct; 12. Air inlet; 13. Air outlet; 14. First housing; 15. Second housing; 16. Connecting part; 17. Outer air guide plate; 18. Inner air guide plate; 19. Air guide gap; 110. Second air gathering chamber; 120. Flow guide plate; 130. Extension end;

[0061] 101. Front section; 102. Rear section; 103. First half-shell; 104. Second half-shell;

[0062] 1011. Air supply cavity; 1012. Second air guide plate; 1013. Third air guide plate;

[0063] 1021. Air inlet cavity;

[0064] 111. Inner surface;

[0065] 121. First air inlet; 122. Second air inlet;

[0066] 131. First air outlet; 132. Second air outlet; 133. Connecting rib;

[0067] 141. First air duct; 151. Second air duct;

[0068] 171. Air guide surface; 181. Chamfer;

[0069] 1201, First guide section; 1202, Second guide section;

[0070] 201. First fan assembly; 202. Second fan assembly; 203. Third fan assembly;

[0071] 21. Air guide tube; 22. First impeller; 23. Second impeller; 24. Air guide shroud;

[0072] 221. First blade;

[0073] 231. Second blade; 232. First ventilation hole;

[0074] 241. Second ventilation hole;

[0075] 31. Wind Gathering Section; 311. First Wind Gathering Chamber; 32. Inlet. Detailed Implementation

[0076] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0077] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0078] Example 1

[0079] This embodiment provides a neck fan that can increase the effective airflow perceived by the user, improve cooling efficiency, and bring a better cooling experience to the user. At the same time, it improves the safety of using the neck fan.

[0080] As shown in Figures 1, 2, and 3, the neck fan includes a support 1 configured to be worn around the neck. The support 1 includes housings 10 located on both sides of the neck. An air duct 11 and a fan assembly 2 are disposed within the housings 10. An air inlet 12 and an air outlet 13 are provided on the housings 10, both of which are connected to the air duct 11.

[0081] The neck fan provided in this embodiment, when the fan assembly 2 is working, allows air to enter the air duct 11 through the air inlet 12 and be blown out through the air outlet 13, thereby driving airflow around the neck and producing a cooling sensation. By setting an independent air duct 11 in the housing 10 of the bracket 1, the airflow generated by the fan assembly 2 can be guided and constrained, making the airflow more concentrated and powerfully blown out from the air outlet 13. The airflow is precisely directed to the key cooling areas of the neck or head through the air outlet 13, avoiding wasted airflow, effectively improving the perceived wind speed and cooling efficiency, and bringing a better cooling experience to the user. At the same time, the presence of the air duct 11 can streamline the airflow generated by the fan assembly 2, making the airflow smoother and reducing the noise generated by the neck fan. In addition, since the fan assembly 2 is located inside the housing 10, it can isolate some of the noise generated by the fan assembly 2 and prevent hair, clothing, etc. from being caught in the housing 10, improving the safety of using the neck fan.

[0082] Optionally, the inner wall of the air duct 11 has a smooth inner surface 111 without protrusions. By setting the air duct 11 with a smooth inner surface 111 without protrusions, the friction of air flowing in the air duct 11 is small, the flow is smoother, and the airflow speed is higher, thereby increasing the air outlet speed and air volume of the air outlet 13, which in turn improves the blowing effect of the neck fan and brings a better cooling experience to the user.

[0083] Referring to Figures 1 and 2, by way of example, the air inlet 12 is located at the extended end 130 of the housing 10, and the fan assembly 2 is located between the air inlet 12 and the air duct 11.

[0084] Referring to Figures 1, 2, and 3, the air duct 11 extends in an arc along the length of the housing 10, with an arc of 15° to 345°. This design better adapts to the curvature of the human neck, allowing the air blown from the air outlet 13 to provide excellent coverage for the neck and head, thus improving wearing comfort and feel.

[0085] Referring to Figures 2 and 3, a hollow inner liner 3 is provided inside the shell 10, extending along the length of the shell 10, and defining an air outlet duct 11 within the inner liner 3. The air outlet 13 includes a first air outlet 131 disposed in the shell 10 and a second air outlet 132 disposed in the inner liner 3 and communicating with the air outlet 11. The first air outlet 131 and the second air outlet 132 are connected. By providing the inner liner 3 within the shell 10 and placing the air outlet 11 within the inner liner 3, the air outlet 11 is isolated from other spaces inside the shell 10, reducing the airflow space. This results in faster airflow and higher pressure within the air outlet 11, thereby increasing the airflow velocity.

[0086] Optionally, the inner liner 3 and the outer shell 10 are detachably connected. For example, the inner liner 3 and the outer shell 10 are connected by threads or snap-fit. By providing a detachable inner liner 3, the inner liner 3 can be manufactured separately. Higher precision processing methods or equipment can be used to precisely process the periphery inside the air duct 11, thereby increasing the smoothness of the inner surface 111. Alternatively, the inner liner 3 can be molded separately using a material with a low coefficient of friction, minimizing air friction within the air duct 11 and making airflow smoother. The threaded or snap-fit ​​connection facilitates the assembly and disassembly of the inner liner 3 and the outer shell 10.

[0087] In some other embodiments, the design may also include a first air guide plate (not shown) inside the housing 10, with an air duct 11 formed between the first air guide plate and the inner wall of the housing 10. The first air guide plate and / or the inner wall of the housing 10 may be precision-processed to increase the smoothness of the inner surface 111 of the air duct 11, thereby reducing air friction resistance.

[0088] Referring to Figures 4 and 5, the outer surface of the inner liner 3 is provided with a protruding air-gathering part 31, which contains a trumpet-shaped first air-gathering cavity 311. The cross-section of the first air-gathering cavity 311 decreases proportionally along the airflow direction. A second air outlet 132 is provided on the air-gathering part 31. The air duct 11, the first air-gathering cavity 311, and the second air outlet 132 are connected in sequence. Because the cross-section of the first air-gathering cavity 311 decreases proportionally along the airflow direction, the air in the air duct 11 can be pressurized after entering the first air-gathering cavity 311. The pressurized airflow is blown out from the air outlet 13, which increases the air volume and air speed at the air outlet 13, thereby improving the blowing effect of the neck fan.

[0089] Referring to Figure 3, the air duct 11 is arranged in a trumpet shape, and the cross-section of the air duct 11 decreases proportionally along the airflow direction. By adopting a trumpet-shaped air duct 11, and with the cross-section of the air duct 11 decreasing proportionally along the airflow direction, the airflow velocity within the air duct 11 can gradually increase, thereby forming a high-speed, concentrated airflow at the air outlet 13. This makes the airflow volume and velocity from the air outlet 13 uniform, resulting in better airflow and improved user comfort and cooling efficiency.

[0090] Referring to Figure 3, the larger end of the air duct 11 is provided with an inlet 32, and the ratio of the inner diameter of the inlet 32 ​​to the inner diameter of the smaller end of the air duct 11 is 1 to 8. By adopting a ratio of 1 to 8 between the inner diameter of the larger end of the air duct 11 and the inner diameter of the smaller end, the uniformity of the air volume and air velocity blown out of the first air outlet 131 is optimized.

[0091] Optionally, the inner diameter of the inlet 32 ​​is 15mm to 40mm.

[0092] For example, inlet 32 ​​is a circular inlet, which allows for more uniform airflow into duct 11 from inlet 32. In other embodiments, inlet 32 ​​may be an elliptical inlet.

[0093] Referring to Figures 3 and 4, the inner liner 3 extends in an arc shape along the length of the shell 10, and both the first air outlet 131 and the second air outlet 132 extend in an arc shape along the length of the shell 10. This arrangement allows air to form a uniform airflow wall after being blown out from the second air outlet 132 and the first air outlet 131, providing excellent coverage for the neck and head and improving wearing comfort and feel.

[0094] Optionally, the air outlet 13 includes a single strip-shaped hole extending along the length of the housing 10. The extension length of the strip-shaped hole is 100mm to 200mm. As shown in Figure 1, the opening width d1 of the strip-shaped hole is 1mm to 7mm. By using strip-shaped holes with an extension length of 100mm to 200mm and an opening width d1 of 2mm to 15mm, the air outlet 13 has a slender structure, resulting in a better airflow wall that provides better coverage for the neck and head, more concentrated airflow, larger air volume, and higher speed.

[0095] In some embodiments, the air outlet 13 may include a plurality of air outlet holes arranged in an array. For example, the air outlet holes are small holes, and a plurality of small holes are densely arranged.

[0096] Referring to Figures 6 and 7, the fan assembly 2 includes an air guide duct 21, a first impeller 22, a second impeller 23, and a motor (not shown). The first impeller 22 is located inside the air guide duct 21, and the output end of the motor is connected to the first impeller 22 to drive it to rotate. The second impeller 23 is located inside the air guide duct 21 and is spaced apart from the first impeller 22. For example, the first impeller 22 has a plurality of spirally extending first blades 221 arranged around its periphery. The second impeller 23 is located at one end of the air guide duct 21 near the inner liner 3 and is integrally formed with the air guide duct 21. The second impeller 23 has a plurality of spirally extending second blades 231 arranged around its periphery, and a first ventilation hole 232 communicating with the air duct 11 is formed between two adjacent second blades 231.

[0097] In one embodiment, the first blade 221 on the first impeller 22 and the second blade 231 on the second impeller 23 have opposite spiral directions. This arrangement prevents the second blade 231 from causing air in the duct 11 to flow back into the air guide tube 21, thereby increasing the pressure of the air entering the duct 11 and improving the blowing effect.

[0098] Referring to Figure 7, the second blade 231 extends counterclockwise in a spiral direction toward the first impeller 22, and the first blade 221 extends clockwise in a spiral direction away from the second impeller 23. It can be understood that the second blade 231 can also be set to extend clockwise in a spiral direction toward the first impeller 22, and the first blade 221 can be set to extend counterclockwise in a spiral direction away from the second impeller 23.

[0099] Referring to Figures 2, 6, and 7, an air guide shroud 24 is provided between the second impeller 23 and the inner liner 3. The air guide shroud 24 has several second ventilation holes 241 arranged around its upper ring. The first ventilation hole 232, the second ventilation holes 241, and the air duct 11 are connected in sequence. By setting up the air guide shroud 24, the air is evenly distributed and output using the second ventilation holes 241 on the air guide shroud 24.

[0100] Optionally, the motor is a high-speed motor with a speed exceeding 6000 rpm.

[0101] The working principle of the neck fan provided in this embodiment is as follows: when the motor is started, air passes through the air inlet 12, the air guide tube 21, the first ventilation hole 232, the second ventilation hole 241, the air duct 11, the first air gathering chamber 311, the second air outlet 132 in sequence, and finally blown out from the first air outlet 131.

[0102] The neck fan of this embodiment has a smooth inner surface 111 without protrusions. When the air flows in the air duct 11, the friction is small, the flow is smoother and the speed is high, which makes the air outlet 13 have a high air speed, a large air volume and a better blowing effect.

[0103] Example 2

[0104] As shown in Figures 8 and 9, this embodiment provides a neck fan, wherein the housing 10 includes a front section 101 and a rear section 102 extending along its length. The rear section 102 is close to the rear side of the human neck, and the fan assembly 2 is located inside the rear section 102 of the housing 10. The rear section 102 is provided with an air inlet chamber 1021, and the front section 101 is provided with an air outlet chamber 1011. The air duct 11 includes the air inlet chamber 1021 and the air outlet chamber 1011. The air inlet 12, the air inlet chamber 1021, the air outlet chamber 1011, and the air outlet 13 are connected in sequence. The fan assembly 2 delivers the air in the air inlet chamber 1021 forward to the air outlet chamber 1011.

[0105] By providing a front section 101 and a rear section 102 extending along the length of the housing 10 on the housing 10, and placing the fan assembly 2 on the rear section 102, the center of gravity of the entire neck fan is positioned at the rear, thus avoiding a feeling of heaviness on the user when wearing it, making the user more comfortable to wear.

[0106] Referring to Figure 9, the outer surface of the rear section 102 is provided with an air inlet 12, and the outer surface of the front section 101 is provided with an air outlet 13. That is, the rear section 102 is provided with an air inlet cavity 1021, a fan assembly 2, and an air inlet 12, and the front section 101 is provided with an air supply cavity 1011 and an air outlet 13. The air inlet 12, the air inlet cavity 1021, the air supply cavity 1011, and the air outlet 13 are connected in sequence. The fan assembly 2 delivers the air in the air inlet cavity 1021 forward to the air supply cavity 1011, and finally blows the air out of the air outlet 13 toward the neck of the human body.

[0107] Optionally, the cross-section of the air duct 11 decreases proportionally along the airflow direction. That is, the cross-section of the air supply cavity 1011 gradually decreases along the airflow direction, so that the airflow velocity in the air supply cavity 1011 can gradually increase, thereby forming a high-speed, concentrated airflow at the air outlet 13. This makes the air volume and air velocity at the air outlet 13 uniform, resulting in better airflow and improved user's airflow feel and cooling efficiency.

[0108] Referring to Figures 10 and 11, a second, inclined air guide plate 1012 is provided inside the front section 101. The second air guide plate 1012 and the inner wall of the front section 101 form an air supply cavity 1011. By providing the inclined, inclined air guide plate 1012, the cross-section of the air supply cavity 1011 gradually decreases along the airflow direction, and guides the air to flow smoothly in the air supply cavity 1011, reducing frictional resistance, increasing the air volume and velocity at the air outlet 13, and improving the air supply effect.

[0109] Referring to Figures 10 and 11, multiple third air guide plates 1013 are spaced apart within the air supply cavity 1011 along the airflow direction, and the third air guide plates 1013 are located below the air outlet 13. By setting the third air guide plates 1013, the air in the air supply cavity 1011 is guided to the air outlet 13, making the airflow smoother.

[0110] Optionally, the third air guide plate 1013 is an arc-shaped air guide plate, which protrudes in an arc shape in the direction of air flow. That is, the arc-shaped concave surface of the third air guide plate 1013 faces the direction of incoming flow. Using an arc-shaped third air guide plate 1013 can improve the air guiding effect.

[0111] Referring to Figure 11, the distance L between two adjacent third air guide plates 1013 is 10mm to 50mm. This arrangement allows the third air guide plate 1013 to be located in the middle area below the air outlet 13, thereby improving the air guiding effect of the third air guide plate 1013.

[0112] Referring to Figure 11, the height W of the multiple third air guide plates 1013 gradually decreases along the airflow direction. The height W of the third air guide plate 1013 is defined as the distance between the end of the third air guide plate 1013 closest to the air outlet 13 and the end furthest from the air outlet 13. By setting the height W of the multiple third air guide plates 1013 to gradually decrease along the airflow direction, the airflow uniformity at various positions along the length of the housing 10 of the air outlet 13 is improved.

[0113] Optionally, the height W of the third air guide plate 1013 is 3mm to 10mm. This setting ensures that the height of the third air guide plate 1013 is not too large, thus avoiding affecting the airflow within the air supply cavity 1011, while also serving as a guide near the air outlet 13.

[0114] Referring to Figure 10, the housing 10 includes a first half-shell 103 and a second half-shell 104. The first half-shell 103 and the second half-shell 104 can be connected by screws or by snap-fit. The second air guide plate 1012 and the third air guide plate 1013 are both provided on the first half-shell 103.

[0115] Referring to Figures 8 and 9, the air inlet 12 includes a first air inlet 121, which is located on the outer surface of the rear section 102 away from the neck of the human body. Air can enter from the outside of the rear section 102, increasing the air intake volume. Exemplarily, the first air inlet 121 includes a plurality of circular holes.

[0116] Referring to Figures 8 and 9, the air inlet 12 includes a second air inlet 122, which is disposed on the outer surface of the rear section 102 facing the neck of the human body. By providing the second air inlet 122 on the outer surface of the rear section 102 facing the neck of the human body, when the second air inlet 122 draws in air, it can drive the airflow on the back side of the neck of the human body, thereby improving the heat dissipation effect on the back side of the neck. For example, the second air inlet 122 includes a plurality of elongated holes arranged side by side.

[0117] Referring to Figure 1, each housing 10 is provided with an air outlet 13, which includes a single strip-shaped hole extending along the length of the housing 10. The strip-shaped hole allows the air blown out from the air outlet 13 to form a uniform airflow wall, providing good coverage for the neck and head, and improving the wearing comfort and body feel.

[0118] In some embodiments, the air outlet 13 may include a plurality of strip-shaped holes spaced apart along the length of the housing 10.

[0119] In some embodiments, the air outlet 13 may include a plurality of air outlet holes arranged in an array. For example, the air outlet holes are small holes, and a plurality of small holes are densely arranged.

[0120] Optionally, the cross-section of the air duct 11 is reduced proportionally along the airflow direction, so that the airflow velocity in the air duct 11 can gradually increase, thereby forming a high-speed, concentrated airflow at the air outlet 13, which in turn makes the air volume and wind speed blown out of the air outlet 13 uniform, resulting in better airflow effect and improving the user's airflow feel and cooling efficiency.

[0121] Optionally, the air duct 11 extends in an arc shape along the length of the housing 10, with an arc of 15° to 345°, which can better adapt to the curvature of the human neck, so that the air blown out of the air outlet 13 has a good wrapping effect on the neck and head, improving the wearing comfort and body feeling.

[0122] Optionally, the fan assembly 2 includes an air guide duct 21, a first impeller 22, a second impeller 23, and a motor (not shown). The first impeller 22 is located inside the air guide duct 21, and the output end of the motor is connected to the first impeller 22 to drive its rotation. The second impeller 23 is located inside the air guide duct 21 and is spaced apart from the first impeller 22. The first blade 221 on the first impeller 22 and the second blade 231 on the second impeller 23 have opposite spiral directions. By setting the second blade 231 with opposite spiral directions to the first blade 221, the second blade 231 can prevent air in the air supply cavity 1011 from flowing back into the air guide duct 21, thereby increasing the pressure of the air entering the air supply cavity 1011 and improving the blowing effect.

[0123] For example, the second blade 231 extends counterclockwise in a spiral direction toward the first impeller 22, and the first blade 221 extends clockwise in a spiral direction away from the second impeller 23. It can be understood that the second blade 231 can also be set to extend clockwise in a spiral direction toward the first impeller 22, and the first blade 221 can be set to extend counterclockwise in a spiral direction away from the second impeller 23.

[0124] Optionally, a guide shroud 24 is provided between the second impeller 23 and the air supply chamber 1011. The guide shroud 24 is provided with a plurality of second ventilation holes 241. A first ventilation hole 232 communicating with the air supply chamber 1011 is formed between two adjacent second blades 231. The first ventilation hole 232, the second ventilation hole 241 and the air supply chamber 1011 are connected in sequence. By providing the guide shroud 24, the air is evenly distributed and output using the second ventilation holes 241 on the guide shroud 24.

[0125] For example, the motor is a high-speed motor with a rotation speed exceeding 6000 rpm. By using a high-speed motor, the neck fan achieves higher airflow, higher airflow, and higher airflow efficiency, resulting in better airflow performance.

[0126] In this embodiment, the neck fan features a front section 101 and a rear section 102 extending along the length of the housing 10. The fan assembly 2 is positioned on the rear section 102, shifting the overall center of gravity of the neck fan to the rear. This avoids a feeling of heaviness on the user during wear, making it more comfortable. The rear section 102 has an air inlet 1021, the fan assembly 2, and an air inlet 12. The front section 101 has an air outlet 1011 and an air outlet 13. These components are sequentially connected. The fan assembly 2 delivers air from the air inlet 1021 to the air outlet 1011, and finally, the air is blown out from the air outlet 13 onto the user's neck, providing a cooling sensation and meeting the cooling needs.

[0127] Example 3

[0128] As shown in Figures 12 and 13, this embodiment provides a neck fan, wherein the two housings 10 of the bracket 1 are a first housing 14 and a second housing 15, respectively. The first housing 14 has a first air duct 141, and the second housing 15 has a second air duct 151. The first air duct 141 and the second air duct 151 are connected to form a U-shaped air duct. At least three fan assemblies 2 are arranged at intervals within the U-shaped air duct, and the at least three fan assemblies 2 drive the air in the U-shaped air duct to flow from one end of the U-shaped air duct to the other end.

[0129] Because the U-shaped air duct runs through the entire support 1, and is quite long, and both the first housing 14 and the second housing 15 are equipped with multiple air outlets 13 distributed along the length of the U-shaped air duct, the neck fan has a large air coverage area and good air blowing effect. By arranging at least three fan assemblies 2 at intervals within the U-shaped air duct, the air in the U-shaped air duct flows from one end to the other through the simultaneous extraction and delivery of air by the three fan assemblies 2. As the air flows through each air outlet 13, it is blown out from the air outlet 13, enhancing the air blowing effect.

[0130] Optionally, the first housing 14 and the second housing 15 are each provided with two or more air outlets 13.

[0131] Referring to Figures 14 and 15, in the air outlet direction of the air outlet 13, the projections of the air outlet 13 and the corresponding fan assembly 2 do not overlap. By setting the projections of the air outlet 13 and the corresponding fan assembly 2 to not overlap, the air supply of the fan assembly 2 and the air outlet 13 do not interfere with each other, making the air supply and air outlet more stable.

[0132] Optionally, referring to Figure 12, the air inlet 12 is located at the extended end 130 of the first housing 14.

[0133] When the first housing 14 is provided with an air inlet 12, the second housing 15 is not provided with an air inlet 12.

[0134] Referring to Figures 12 and 15, the first housing 14 and the second housing 15 are connected by a connecting portion 16. The three fan assemblies 2 are a first fan assembly 201, a second fan assembly 202, and a third fan assembly 203. The first fan assembly 201 is located near the air inlet 12, the second fan assembly 202 is located in the first air duct 141 near the connecting portion 16, and the third fan assembly 203 is located in the second air duct 151 near the connecting portion 16. Optionally, the connecting portion 16 is integrally formed with the first housing 14 and the second housing 15 or is detachably connected.

[0135] In some embodiments, four fan assemblies 2 may be provided, with two fan assemblies 2 provided in the first housing 14 and two fan assemblies 2 provided in the second housing 15.

[0136] In some embodiments, the air outlet 13 includes a single strip-shaped hole extending along the length of the housing 10. By providing a strip-shaped hole extending along the length of the U-shaped air duct, the air volume is large and the blowing effect is good.

[0137] In some embodiments, the air outlet 13 includes a plurality of strip-shaped holes spaced apart along the length of the housing 10. For example, referring to FIG14, a plurality of connecting ribs 133 are provided in the elongated air outlet 13, and the plurality of connecting ribs 133 divide the elongated air outlet 13 into a plurality of strip-shaped sub-air outlets, and the multiple sub-air outlets emit air at the same time, resulting in more uniform air output.

[0138] Referring to Figure 14, the thickness d3 of the connecting rib 133 along the length of the air outlet 13 is 0.5mm to 1.5mm. That is, the thinness of the connecting rib 133 avoids occupying a large area of ​​the air outlet 13, allowing the air outlet 13 to maintain a sufficiently large airflow. In one embodiment, the thickness d3 of the connecting rib 133 is 1mm.

[0139] Referring to Figures 12 and 13, both the first housing 14 and the second housing 15 include a first half-shell 103 and a second half-shell 104 that engage with each other. The first half-shell 103 and the second half-shell 104 can be connected by screws or by snap-fit. For example, the first half-shell 103 is engaged above the second half-shell 104, and the first half-shell 103 is provided with an air outlet 13.

[0140] In some embodiments, the air outlet 13 includes a plurality of air outlet holes arranged in an array. For example, the air outlet holes are small holes, and a plurality of small holes are densely arranged.

[0141] Optionally, the cross-section of the air duct 11 is reduced proportionally along the airflow direction, so that the airflow velocity in the air duct 11 can gradually increase, thereby forming a high-speed, concentrated airflow at the air outlet 13, which in turn makes the air volume and wind speed blown out of the air outlet 13 uniform, resulting in better airflow effect and improving the user's airflow feel and cooling efficiency.

[0142] Optionally, the air duct 11 extends in an arc shape along the length of the housing 10, with an arc of 15° to 345°, which can better adapt to the curvature of the human neck, so that the air blown out of the air outlet 13 has a good wrapping effect on the neck and head, improving the wearing comfort and body feeling.

[0143] Optionally, the fan assembly 2 includes an air guide duct 21, a first impeller 22, a second impeller 23, and a motor (not shown). The first impeller 22 is located inside the air guide duct 21, and the output end of the motor is connected to the first impeller 22 to drive its rotation. The second impeller 23 is located inside the air guide duct 21 and is spaced apart from the first impeller 22. The first blade 221 on the first impeller 22 and the second blade 231 on the second impeller 23 have opposite spiral directions. By setting the second blade 231 with opposite spiral directions to the first blade 221, the second blade 231 can prevent air in the U-shaped air duct from flowing back into the air guide duct 21, thereby increasing the air pressure and improving the blowing effect.

[0144] For example, the second blade 231 extends counterclockwise in a spiral direction toward the first impeller 22, and the first blade 221 extends clockwise in a spiral direction away from the second impeller 23. It can be understood that the second blade 231 can also be set to extend clockwise in a spiral direction toward the first impeller 22, and the first blade 221 can be set to extend counterclockwise in a spiral direction away from the second impeller 23.

[0145] Optionally, a guide shroud 24 is provided on the side of the second impeller 23 away from the first impeller 22. The guide shroud 24 has a plurality of second ventilation holes 241 arranged around its surface. A first ventilation hole 232 is formed between two adjacent second blades 231, and the first ventilation hole 232 and the second ventilation hole 241 are connected. By providing the guide shroud 24, the air is evenly distributed and output using the second ventilation holes 241 on the guide shroud 24.

[0146] Referring to Figures 12, 13 and 15, the axis of the air guide 21 on the first fan assembly 201 is parallel to the air intake direction of the air inlet 12, the axis of the air guide 21 on the second fan assembly 202 extends in the direction of air flow toward the connection, and the axis of the air guide 21 on the third fan assembly 203 extends in the direction of air flow away from the connection 16.

[0147] Optionally, the motor is a high-speed motor with a rotational speed exceeding 6000 rpm. By using a high-speed motor, when all three motors work simultaneously, air can be efficiently transported from one end of the U-shaped duct to the other.

[0148] To ensure that outside air is not drawn back into the U-shaped duct from the air outlet 13, the air delivery efficiency of the three fan assemblies 2 can be gradually reduced along the airflow direction in the U-shaped duct, or an air guide structure can be set in the U-shaped duct so that some air is blown out from the air outlet 13 and the other part of the air continues to flow along the U-shaped duct to the next air outlet 13.

[0149] The neck fan provided in this embodiment uses a U-shaped air duct formed by connecting the first air duct 141 and the second air duct 151 to run through the entire bracket 1. The U-shaped air duct is long and at least three fan assemblies 2 are spaced apart in the U-shaped air duct. The three fan assemblies 2 are distributed in the first air duct 141 and the second air duct 151. The three fan assemblies 2 simultaneously draw in and deliver air, so that the air in the U-shaped air duct flows from one end of the U-shaped air duct to the other end. When the air flows through each air outlet 13, it is blown out from the air outlet 13, so that the neck fan has a large air outlet coverage area and a good blowing effect.

[0150] Example 4

[0151] As shown in Figures 16, 17 and 18, this embodiment provides a neck fan, wherein the housing 10 is provided with an outer air guide plate 17 and an inner air guide plate 18. Both the outer air guide plate 17 and the inner air guide plate 18 extend along the length direction of the housing 10. The inner air guide plate 18 extends into the lower part of the outer air guide plate 17 and maintains a distance from the outer air guide plate 17 to form an air guide gap 19. The air guide gap 19 is connected to the air duct 11, and the end of the air guide gap 19 away from the air duct 11 forms an air outlet 13, which faces the neck or head of the human body.

[0152] Because an air guide gap 19 is formed between the outer air guide plate 17 and the inner air guide plate 18, which is connected to the air duct 11, and the side of the air guide gap 19 away from the air duct 11 is open to form an air outlet 13 facing the neck or head of the human body, when using the neck fan, the fan assembly 2 draws in air, and the air passes through the air duct 11, the air guide gap 19 and the air outlet 13 in sequence and is blown out. The air guide gap 19 guides the air flow, so that the air blows directly from the air outlet 13 to the neck or head of the human body, resulting in a better blowing effect.

[0153] Referring to Figure 18, both the outer air guide plate 17 and the inner air guide plate 18 have air guide surfaces 171 on their respective sides, and an air guide gap 19 is defined between the two air guide surfaces 171. By setting the air guide surfaces 171, the airflow in the air guide gap 19 can be made smoother by the guiding effect of the air guide surfaces 171, thereby making the air blown out of the air outlet 13 more uniform and the blowing effect better.

[0154] For example, the air guide surface 171 can be an arc-shaped surface or an inclined surface.

[0155] Referring to Figure 18, the inner air guide plate 18 has a chamfer 181 at one end extending below the outer air guide plate 17. By setting the chamfer 181, the wind resistance can be reduced, making the air flow in the air duct 11 to the air guide gap 19 smoother. The chamfer 181 can be a rounded corner or a beveled corner.

[0156] Referring to Figure 18, the width d2 of the air guide gap 19 is 1mm to 5mm. It should be noted that the width d2 of the air guide gap 19 is defined as the distance between the side of the outer air guide plate 17 facing the inner air guide plate 18 and the side of the inner air guide plate 18 facing the outer air guide plate 17. By setting the air guide gap 19 with a width d2 of 1mm to 5mm, the air guide gap 19 has a narrow and elongated structure, resulting in a high air outlet velocity. In one embodiment, the width d2 of the air guide gap 19 is 1.5mm to 3mm.

[0157] Referring to Figure 18, the depth h of the air guide gap 19 is 3mm to 10mm. It should be noted that the depth of the air guide gap 19 is defined as the distance between the side of the outer air guide plate 17 closest to the air outlet 13 and the side of the inner air guide plate 18 furthest from the air outlet 13. By setting the air guide gap 19 with a depth h of 3mm to 10mm, air flows a certain distance within the air guide gap 19, forming a stable fluid before being blown out from the air outlet 13, resulting in a better airflow effect. In one embodiment, the depth h of the air guide gap 19 is 4mm to 6mm.

[0158] In one embodiment, the width d2 of the air guide gap 19 is 1 mm to 5 mm; and / or, the depth h of the air guide gap 19 is 3 mm to 10 mm.

[0159] Referring to Figure 16, the air guide gaps 19 on the two housings 10 are connected. By setting the air guide gaps 19 on the two housings 10 to be connected, an air guide gap 19 can be formed around the left and right sides and the back of the human neck, resulting in a large air blowing coverage area and good air blowing effect.

[0160] Referring to Figures 20 and 21, a trumpet-shaped second air-gathering cavity 110 is provided between the fan assembly 2 and the air duct 11. The larger end of the second air-gathering cavity 110 is close to the fan assembly 2, and the smaller end of the second air-gathering cavity 110 is connected to the air duct 11. By setting the trumpet-shaped second air-gathering cavity 110, the air is pressurized and delivered to the air duct 11, increasing the air outlet speed and air volume of the air guide gap 19, thereby improving the air outlet effect at the air outlet 13.

[0161] Referring to Figures 19 and 21, a guide plate 120 is provided inside the housing 10. The guide plate 120 includes a first guide portion 1201 and a second guide portion 1202 that are distributed and curved along the airflow direction. A second air-gathering cavity 110 is formed between the first guide portion 1201 and the inner wall of the housing 10. An air duct 11 is formed between the second guide portion 1202, the outer air guide plate 17, and the inner air guide plate 18.

[0162] In some embodiments, the air outlet 13 includes a single strip-shaped hole extending along the length of the housing 10, resulting in a large air volume and good blowing effect.

[0163] In some embodiments, the air outlet 13 includes a plurality of strip-shaped holes spaced apart along the length of the housing 10.

[0164] In some embodiments, the air outlet 13 includes a plurality of air outlet holes arranged in an array. For example, the air outlet holes are small holes, and a plurality of small holes are densely arranged.

[0165] Optionally, the cross-section of the air duct 11 is reduced proportionally along the airflow direction, so that the airflow velocity in the air duct 11 can gradually increase, thereby forming a high-speed, concentrated airflow at the air outlet 13, which in turn makes the air volume and wind speed blown out of the air outlet 13 uniform, resulting in better airflow effect and improving the user's airflow feel and cooling efficiency.

[0166] Optionally, the air duct 11 extends in an arc shape along the length of the housing 10, with an arc of 15° to 345°, which can better adapt to the curvature of the human neck, so that the air blown out of the air outlet 13 has a good wrapping effect on the neck and head, improving the wearing comfort and body feeling.

[0167] Optionally, the fan assembly 2 includes an air guide duct 21, a first impeller 22, a second impeller 23, and a motor (not shown). The first impeller 22 is located inside the air guide duct 21, and the output end of the motor is connected to the first impeller 22 to drive its rotation. The second impeller 23 is located inside the air guide duct 21 and is spaced apart from the first impeller 22. The first blade 221 on the first impeller 22 and the second blade 231 on the second impeller 23 have opposite spiral directions. By setting the second blade 231 with opposite spiral directions to the first blade 221, the second blade 231 can prevent air in the air duct 11 from flowing back into the air guide duct 21, thereby increasing the air pressure entering the air duct 11 and improving the blowing effect.

[0168] For example, the second blade 231 extends counterclockwise in a spiral direction toward the first impeller 22, and the first blade 221 extends clockwise in a spiral direction away from the second impeller 23. It is understood that the second blade 231 can also be configured to extend clockwise in a spiral direction toward the first impeller 22, and the first blade 221 can be configured to extend counterclockwise in a spiral direction away from the second impeller 23.

[0169] Optionally, a guide shroud 24 is provided on the side of the second impeller 23 near the air duct 11. The guide shroud 24 has a plurality of second ventilation holes 241 arranged around its surface. A first ventilation hole 232 communicating with the air duct 11 is formed between two adjacent second blades 231. The first ventilation hole 232, the second ventilation holes 241, the second air-gathering chamber 110, and the air duct 11 are sequentially connected. By providing the guide shroud 24, the air is evenly dispersed and output using the second ventilation holes 241 on the guide shroud 24.

[0170] Optionally, the motor is a high-speed motor with a rotation speed exceeding 6000 rpm. By using a high-speed motor, the impeller is driven to rotate, providing high-pressure airflow to the air duct 11. The high-pressure airflow is ejected from the narrow air guide gap 19, driving the airflow around the air outlet 13 and improving the blowing effect.

[0171] The neck fan provided in this embodiment provides an outer air guide plate 17 and an inner air guide plate 18 on the housing 10. The outer air guide plate 17 and the inner air guide plate 18 are spaced apart and form an air guide gap 19 that communicates with the air duct 11. The air guide gap 19 guides the air flow so that the air blows directly from the air outlet 13 to the neck or head of the human body, resulting in a better blowing effect.

[0172] Note that the above description is merely a preferred embodiment and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of this application, and the scope of this application is determined by the scope of the appended claims.

Claims

1. A neck fan, comprising a support (1) configured to be worn around the neck of a person, the support (1) comprising housings (10) located on both sides of the neck of a person. The housing (10) is provided with an air duct (11) and a fan assembly (2). The housing (10) is provided with an air inlet (12) and an air outlet (13). The air inlet (12) and the air outlet (13) are both connected to the air duct (11).

2. The neck fan according to claim 1, wherein, The inner wall of the air duct (11) has a smooth inner surface (111) without protrusions.

3. The neck fan according to claim 1, wherein, The shell (10) is provided with a hollow inner liner (3), which extends along the length of the shell (10) and defines the air duct (11). The air outlet (13) includes a first air outlet (131) disposed on the housing (10) and a second air outlet (132) disposed on the inner liner (3) and connected to the air duct (11), wherein the first air outlet (131) and the second air outlet (132) are connected.

4. The neck fan according to claim 3, wherein, The outer surface of the inner liner (3) is provided with a wind-gathering part (31), and the wind-gathering part (31) is provided with a trumpet-shaped first wind-gathering cavity (311). The cross-section of the first wind-gathering cavity (311) is proportionally reduced along the airflow direction. The second air outlet (132) is provided on the wind-gathering part (31), and the air duct (11), the first wind-gathering cavity (311), and the second air outlet (132) are connected in sequence.

5. The neck fan according to claim 1, wherein, A first air guide plate is provided inside the housing (10), and the air duct (11) is formed between the first air guide plate and the inner wall of the housing (10).

6. The neck fan according to claim 1, wherein, The housing (10) includes a front section (101) and a rear section (102) extending along its length, the rear section (102) being close to the rear side of the human neck, and the fan assembly (2) being located within the rear section (102) of the housing (10); The rear section (102) is provided with an air inlet cavity (1021), the front section (101) is provided with an air supply cavity (1011), the air duct (11) includes the air inlet cavity (1021) and the air supply cavity (1011), the air inlet (12), the air inlet cavity (1021), the air supply cavity (1011) and the air outlet (13) are connected in sequence, and the fan assembly (2) delivers the air in the air inlet cavity (1021) forward to the air supply cavity (1011).

7. The neck fan according to claim 6, wherein, The front section (101) is provided with an inclined and extended second air guide plate (1012), and the second air guide plate (1012) and the inner wall of the front section (101) form the air supply cavity (1011).

8. The neck fan according to claim 6, wherein, Multiple third air guide plates (1013) are distributed at intervals along the airflow direction inside the air supply cavity (1011), and the third air guide plates (1013) are located below the air outlet (13).

9. The neck fan according to claim 6, wherein, The air inlet (12) includes a first air inlet (121), which is located on the outer surface of the rear section (102) away from the neck of the human body.

10. The neck fan according to claim 6, wherein, The air inlet (12) includes a second air inlet (122), which is located on the outer surface of the rear section (102) facing the neck of the human body.

11. The neck fan according to claim 1, wherein, The two shells (10) of the bracket (1) are a first shell (14) and a second shell (15), respectively. The first shell (14) has a first air duct (141), and the second shell (15) has a second air duct (151). The first air duct (141) and the second air duct (151) are connected to form a U-shaped air duct. At least three fan assemblies (2) are arranged at intervals in the U-shaped air duct, and at least three fan assemblies (2) drive the air in the U-shaped air duct to flow from one end of the U-shaped air duct to the other end.

12. The neck fan according to claim 11, wherein, In the air outlet (13) direction, the projections of the air outlet (13) and the corresponding fan assembly (2) do not overlap.

13. The neck fan according to claim 11, wherein, The first housing (14) and the second housing (15) are connected by a connecting part (16). The three fan assemblies (2) are a first fan assembly (201), a second fan assembly (202) and a third fan assembly (203). The first fan assembly (201) is close to the air inlet (12), the second fan assembly (202) is located in the first air duct (141) near the connecting part (16), and the third fan assembly (203) is located in the second air duct (151) near the connecting part (16).

14. The neck fan according to claim 1, wherein, The housing (10) is provided with an outer air guide plate (17) and an inner air guide plate (18). The outer air guide plate (17) and the inner air guide plate (18) both extend along the length direction of the housing (10). The inner air guide plate (18) extends into the lower part of the outer air guide plate (17) and maintains a distance from the outer air guide plate (17) to form an air guide gap (19). The air guide gap (19) is connected to the air duct (11), and the end of the air guide gap (19) away from the air duct (11) forms the air outlet (13). The air outlet (13) faces the neck or head of the human body.

15. The neck fan according to claim 14, wherein, The outer air guide plate (17) and the inner air guide plate (18) are each provided with an air guide surface (171) on the side facing each other, and the air guide gap (19) is defined between the two air guide surfaces (171).

16. The neck fan according to claim 14, wherein, The air guide gaps (19) on the two housings (10) are connected.

17. The neck fan according to claim 14, wherein, The width d2 of the air guide gap (19) is 1mm to 5mm; And / or, the depth h of the air guide gap (19) is 3mm to 10mm.

18. The neck fan according to claim 14, wherein, A horn-shaped second air-gathering cavity (110) is provided between the fan assembly (2) and the air duct (11). The larger end of the second air-gathering cavity (110) is close to the fan assembly (2), and the smaller end of the second air-gathering cavity (110) is connected to the air duct (11).

19. The neck fan according to claim 18, wherein, The housing (10) is provided with a guide plate (120), the guide plate (120) includes a first guide part (1201) and a second guide part (1202) distributed along the air flow direction, the first guide part (1201) and the inner wall of the housing (10) form a second air gathering cavity (110), and the second guide part (1202), the outer guide plate (17) and the inner guide plate (18) form an air duct (11).

20. The neck fan according to any one of claims 1-19, wherein, The cross-section of the air duct (11) decreases proportionally along the airflow direction.

21. The neck fan according to any one of claims 1-19, wherein, The air duct (11) extends in an arc shape along the length of the shell (10), and the arc of the air duct (11) is 15° to 345°.

22. The neck fan according to any one of claims 1-19, wherein, The air outlet (13) includes a single strip-shaped hole extending along the length direction of the housing (10); or, the air outlet (13) includes a plurality of strip-shaped holes spaced apart along the length direction of the housing (10); or, the air outlet (13) includes a plurality of air outlet holes arranged in an array.

23. The neck fan according to any one of claims 1-19, wherein, The fan assembly (2) has an air guide tube (21), a first impeller (22), a second impeller (23) and a motor. The first impeller (22) is located inside the air guide tube (21). The output end of the motor is connected to the first impeller (22) to drive the first impeller (22) to rotate. The second impeller (23) is located inside the air guide tube (21) and is spaced apart from the first impeller (22). The first blade (221) on the first impeller (22) and the second blade (231) on the second impeller (23) have opposite spiral directions.

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