A neck-hung fan

Abstract

The application discloses a neck-hung fan, which comprises a first fan body and a second fan body, and the first fan body and the second fan body each comprise a shell and a fan blade assembly. The shell has an inner surface and an outer surface; the inner surface comprises a first part located at one end and a second part connecting the first part and a joint of the first fan body and the second fan body; at least one of the first part and the outer surface has an air inlet, and the second part is recessed towards one side of the outer surface to form an external air guide channel, and the external air guide channel is provided with an air outlet at one end close to the first part. The fan blade assembly is arranged in the shell and located between the first part and the outer surface, and the fan blade assembly comprises turbine blades arranged along the direction from the inner surface to the outer surface, and the turbine blades are used for guiding the air of the air inlet to the air outlet, and the air of the air outlet is used for blowing to the neck of a human body via the external air guide channel. The light and thin design of the neck-hung fan can be realized by designing the external air guide channel.

Description

Technical Field

[0001] This application relates to the field of fan technology, and more particularly to a neck-hanging fan. Background Technology

[0002] As a portable cooling device, fans have received widespread attention and application in hot seasons in recent years, especially neck fans, which are both portable and free up the hands, making them popular among users.

[0003] However, in related technologies, neck fans require an air duct within the fan casing to direct the airflow generated by the fan blades in the appropriate direction towards the user. This air duct must match the air intake pattern of the fan blades while ensuring smooth airflow exhaust, resulting in a complex air duct design. Sufficient space must be reserved within the fan casing for this duct, leading to a relatively large overall size for the neck fan. Therefore, effectively reducing the overall size of neck fans has become an urgent problem to be solved. Utility Model Content

[0004] This application provides a neck fan that solves the problem of excessively large overall size of neck fans in related technologies due to the complex air ducts arranged within their housings.

[0005] This application provides a neck-hanging fan. The neck-hanging fan includes a first fan body and a second fan body, which are respectively positioned on both sides of a person's neck. Both the first and second fan bodies include a housing and a fan blade assembly. The housing has an inner surface near the person's neck and an outer surface opposite to the inner surface. The inner surface includes a first portion at one end and a second portion connecting the first portion and the first and second fan bodies. At least one of the first portion and the outer surface has an air inlet. The second portion is recessed towards the outer surface to form an external air guide channel, and an air outlet is provided at one end of the external air guide channel near the first portion. The fan blade assembly is disposed in the housing and located between the first portion and the outer surface. The fan blade assembly includes turbine blades arranged along the direction from the inner surface to the outer surface. The turbine blades are used to guide the air from the air inlet to the air outlet, and the air from the air outlet is used to blow towards the person's neck via the external air guide channel.

[0006] Based on the embodiments of this application, the neck fan designs an external air duct on the second part of the inner surface of the outer shell of the first fan body and the second fan body. The external air duct is designed outside the outer shell, and the inner shell only needs to accommodate core components such as turbine blades, motor, and battery. There is no need to reserve a complex air duct cavity. This greatly frees up the internal space of the outer shell, and the outer shell can be made thinner and lighter, which is conducive to realizing the thinner and lighter design of the neck fan. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a perspective view of a neck fan in one embodiment of this application from a first-view perspective. Figure 2 This is a perspective view of a neck fan in one embodiment of this application from a second-view perspective. Figure 3 This is a partially exploded structural diagram of a neck fan in one embodiment of this application; Figure 4 This is a cross-sectional view of a neck fan in one embodiment of this application; Figure 5 This is a perspective view of a neck fan in one embodiment of this application from a third-person perspective. Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 This is a perspective view of a neck fan according to another embodiment of this application; Figure 8 This is a perspective view of a neck fan in another embodiment of this application; Figure 9 This is a schematic diagram of the structure of a flexible connector in one embodiment of this application.

[0009] Reference numerals: 1. Neckband fan; 11. First fan body; 12. Second fan body; 13. Outer shell; 13a. Inner side plate; 13b. Outer shell body; 131. Inner surface; 1311. First part; 1312. Second part; 1312a. End face; 1312b. Air guide surface; 132. Outer surface; 1321. Body surface; 1322. Side; 133. Air inlet; 1331. First air inlet; 1331a. Air inlet structure; 1331b. U-shaped grille; 1331c. Connecting part; 1331d. First air inlet hole; 1332. Second air inlet; 1332a. Second air inlet hole; 134. External air duct; 135, air outlet; 21, fan blade assembly; 211, turbine fan blade; 212, pressurized housing; 212a, inlet; 212b, outlet; 31, electronic control assembly; 41, flexible connector; 41a, air inlet gap; 41b, first air inlet gap; 41c, second air inlet gap; 411, connecting body; 411a, main body; 411b, first extension; 411c, second extension; 411d, mounting hole; 412, neck support; 4121, first neck support; 4122, second neck support; 413, protrusion; 50, trigger; 51, button; 52, first knob; 53, second knob. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0011] Please refer to Figures 1-4 As shown, this application proposes a neck fan 1 that enables a thin and light design.

[0012] The neck fan 1 includes a first fan body 11 and a second fan body 12, which are respectively positioned on both sides of a person's neck. Both the first fan body 11 and the second fan body 12 include a housing 13 and a fan blade assembly 21. The housing 13 has an inner surface 131 near the person's neck and an outer surface 132 opposite to the inner surface 131. The inner surface 131 includes a first portion 1311 at one end and a second portion 1312 connecting the first portion 1311 and the connection between the first fan body 11 and the second fan body 12. At least one of the first portion 1311 and the outer surface 132 has an air inlet 133. The second portion 1312 is recessed towards the outer surface 132 to form an external air guide duct 134. An air outlet 135 is provided at the end of the external air guide duct 134 near the first portion 1311. The fan blade assembly 21 is disposed in the housing 13 and located between the first part 1311 and the outer surface 132. The fan blade assembly 21 includes a turbine fan blade 211 disposed along the direction from the inner surface 131 to the outer surface 132. The turbine fan blade 211 is used to guide the air in the air inlet 133 to the air outlet 135. The air in the air outlet 135 is used to blow towards the neck of the human body via the external air guide duct 134.

[0013] The following combination Figures 1-9 The specific structure of the neck fan 1 will be described in detail.

[0014] like Figures 1-4 As shown, the neck fan 1 includes a first fan body 11 and a second fan body 12 for being respectively installed on both sides of the human neck.

[0015] Both the first fan body 11 and the second fan body 12 include a housing 13 and a fan blade assembly 21.

[0016] The outer casing 13 serves as the housing for the first fan body 11 and the second fan body 12. The specific material of the outer casing 13 is not limited here, and designers can make a reasonable choice according to actual needs. For example, the material of the outer casing 13 can include, but is not limited to, plastics (such as ABS (Acrylonitrile-Butadiene-Styrene copolymer), PC (Polycarbonate) or PP (Polypropylene), silicone (such as food-grade or skin-friendly silicone) or metals (such as stainless steel or magnesium alloy), etc.

[0017] The outer casing 13 has an inner surface 131 and an outer surface 132.

[0018] The inner surface 131 is the surface of the outer shell 13 closest to the human neck. The inner surface 131 includes a first part 1311 and a second part 1312. The first part 1311 is located at one end of the inner surface 131. One side of the second part 1312 is connected to the first part 1311, and the other side of the second part 1312 is connected to the connection between the first fan body 11 and the second fan body 12. In other words, the first part 1311 is further away from the back of the human neck than the second part 1312.

[0019] The outer surface 132 is the surface of the outer shell 13 away from the neck of the human body, and the outer surface 132 is set opposite to the inner surface 131.

[0020] At least one of the first part 1311 and the outer surface 132 has an air inlet 133; for example, only the first part 1311 may have an air inlet 133, only the outer surface 132 may have an air inlet 133, or both the first part 1311 and the outer surface 132 may have an air inlet 133.

[0021] The second part 1312 is recessed on the side facing the outer surface 132 to form an external air guide duct 134, and an air outlet 135 is provided at the end of the external air guide duct 134 near the first part 1311.

[0022] like Figures 1-4 As shown, the fan blade assembly 21 is used to drive airflow. The fan blade assembly 21 is disposed in the housing 13 and located between the first part 1311 and the outer surface 132. The specific installation method between the fan blade assembly 21 and the housing 13 is not limited here. Designers can make reasonable designs according to actual needs. For example, the fan blade assembly 21 can be detachably connected to the housing 13 by at least one of the following methods: screw connection, snap connection, or plug connection. Alternatively, the fan blade assembly 21 can also be non-detachably connected to the housing 13 by riveting or gluing.

[0023] The fan blade assembly 21 includes a turbine fan blade 211, the fan shaft of which is arranged along the direction from the inner surface 131 to the outer surface 132, and the turbine fan blade 211 intakes air along its axial direction and exhausts air along its radial direction.

[0024] The turbine blades 211 are used to guide the air from the inlet 133 to the outlet 135. The air from the outlet 135 is then blown towards the neck of the human body via the external air guide duct 134. It can be understood that the side of the outer casing 13 where the inlet 133 is located is the air intake side of the turbine blades 211, and the side of the outer casing 13 where the outlet 135 is located is the air outlet side of the turbine blades 211. The rotation of the turbine blades 211 drives the airflow, creating a pressure difference. A low-pressure zone is formed on the air intake side of the turbine blades 211, drawing air in from the inlet 133. A high-pressure zone is formed on the air outlet side of the turbine blades 211, pushing air out towards the outlet 135, thus creating a continuous airflow. The external air guide duct 134 has a guiding function; the air flowing out of the outlet 135 circulates within the external air guide duct 134 and is guided by the external air guide duct 134 to the neck of the human body, thereby cooling the neck.

[0025] The fan blade assembly 21 also includes a pressure chamber 212, within which the turbine fan blades 211 are disposed. The pressure chamber 212 has an inlet 212a corresponding to the air inlet 133 and an outlet 212b corresponding to the air outlet 135. By designing the pressure chamber 212, it concentrates the radially flowing air from the turbine fan blades 211, guiding the air to the outlet 212b of the pressure chamber 212, and then out through the air outlet 135 to the external air duct 134. (See also...) Figure 4 , Figure 4 The arrows in the diagram indicate the direction of the airflow.

[0026] Based on the neck fan 1 in this application embodiment, an external air guide 134 is designed in the second part 1312 of the inner surface 131 of the outer shell 13 of the first fan body 11 and the second fan body 12. The external air guide 134 is designed outside the outer shell 13. The inner shell 13 only needs to accommodate core components such as turbine blades 211, motor, and battery. There is no need to reserve a complex air duct cavity. This greatly frees up the internal space of the outer shell 13, and the outer shell 13 can be made thinner and lighter, which is conducive to realizing the thinner and lighter design of the neck fan 1.

[0027] like Figures 1-4 As shown, the external air duct 134 extends from the end of the second part 1312 near the first part 1311 to the connection between the first fan body 11 and the second fan body 12. By designing the external air duct 134 as a long strip extending from the first part 1311 to the connection between the first fan body 11 and the second fan body 12, the airflow path of the external air duct 134 is shorter and more linear, which is beneficial to achieving a thinner and lighter design for the neck fan 1. The long strip external air duct 134 also plays a good guiding role for the air flowing out of the air outlet 135, so that as much air flowing out of the air outlet 135 as possible is guided to the neck of the human body, thereby playing a good cooling role for the neck of the human body.

[0028] like Figures 1-4 As shown, the second part 1312 includes an end face 1312a and a guide surface 1312b; the end face 1312a is connected to the first part 1311, and the air outlet 135 is disposed on the end face 1312a; the guide surface 1312b is connected to the end face 1312a, and the cross-section of the guide surface 1312b is a concave U-shape, the width of the U-shape gradually decreasing along the direction from the end face 1312a to the connection between the first fan body 11 and the second fan body 12. The guide surface 1312b includes a first sub-surface, a second sub-surface, and a third sub-surface. The first sub-surface is located between the second and third sub-surfaces, and is connected to both the second and third sub-surfaces. The second and third sub-surfaces are located on the same side of the first sub-surface and are arranged opposite to each other. The first, second, and third sub-surfaces together form the aforementioned U-shape. From the side closest to the air outlet 135 to the side furthest from the air outlet 135, the width of the external air guide duct 134 gradually decreases. This design allows the external air guide duct 134 to also have a converging effect on the air flowing out of the air outlet 135, reducing air volume loss.

[0029] The outer surface 132 includes a main surface 1321 and a side surface 1322. The side surface 1322 is connected to the periphery of the main surface 1321 and is located between the main surface 1321 and the inner surface 131. The axial direction of the turbine blade 211 is from the first part 1311 to the main surface 1321. At least one of the first part 1311 and the main surface 1321 has the aforementioned air inlet 133. The distance from the first part 1311 to the main surface 1321 is less than the width of the first part 1311. The sidewall of the main body surface 1321 corresponding to the first part 1311, the sidewall of the side 1322, and the sidewall of the first part 1311 together form a cavity for placing the turbine blade 211. In combination with the axial air intake and radial air exhaust characteristics of the turbine blade 211, by designing the distance from the first part 1311 to the main body surface 1321 to be smaller than the width of the first part 1311, the thickness of the outer shell 13 at the location of the turbine blade 211 can be effectively reduced, achieving a thin and light design.

[0030] like Figures 1-4As shown, the air inlet 133 includes a first air inlet 1331 and a second air inlet 1332. The first part 1311 has the first air inlet 1331, and the part of the main body surface 1321 corresponding to the first part 1311 has the second air inlet 1332. At this time, the turbine fan blade 211 is a double-suction turbine fan blade 211. The fan blade assembly 21 also includes a motor, which is located in the middle of the turbine fan blade 211. The motor shaft is connected to the fan shaft of the turbine fan blade 211. The motor drives the turbine fan blade 211 to rotate. The two sides of the turbine fan blade 211, which are arranged opposite each other along its axial direction, serve as air intake sides and draw in air from the first air inlet 1331 and the second air inlet 1332 respectively. After the air merges on the outer periphery of the turbine fan blade 211, it is thrown out along the radial direction of the turbine fan blade 211 and finally pushed out from the air outlet 135, thereby forming a continuous wind. By designing a first air inlet 1331 in the first part 1311 and a second air inlet 1332 in the part of the main body surface 1321 corresponding to the first part 1311, the turbine blades 211 form a double-sided air intake, which can effectively increase the air intake area. Under the same air volume, the radial dimension of the turbine blades 211 with double-sided air intake is smaller than that of the turbine blades 211 with single-sided air intake. This can further reduce the width of the outer casing 13 at the location of the turbine blades 211, achieving a miniaturized design. In addition, the double-sided air intake of the turbine blades 211 can make the axial thrust of the turbine blades 211 cancel each other out, reducing the vibration and noise of the turbine blades 211 during rotation, and improving the service life of the turbine blades 211 and the motor. The double-sided air intake of the turbine blades 211 makes the internal flow field of the turbine blades 211 symmetrical, reducing eddy current and backflow losses, and improving motor efficiency.

[0031] Of course, in other embodiments, if the air inlet 133 is only provided in the first part 1311 or the air inlet 133 is only provided in the part of the main body surface 1321 corresponding to the first part 1311, then the turbine fan blade 211 is a single-suction turbine fan blade 211. The fan blade assembly 21 also includes a motor, which is located on the side of the turbine fan blade 211 away from the air inlet 133. The motor shaft is connected to the fan shaft of the turbine fan blade 211. The motor drives the turbine fan blade 211 to rotate. The side of the turbine fan blade 211 facing the air inlet 133 serves as the air intake side, drawing in air from the air inlet 133. The air is thrown out radially along the turbine fan blade 211 and finally pushed out from the air outlet 135, thereby forming a continuous wind.

[0032] like Figures 5-6As shown, the first air inlet 1331 includes multiple U-shaped air inlet structures 1331a or annular air inlet structures 1331a arranged sequentially from the center to the edge of the first part 1311. Each air inlet structure 1331a includes multiple first air inlet holes 1331d arranged along the extension direction of the air inlet structure 1331a. The second air inlet 1332 includes multiple second air inlet holes 1332a. For each U-shaped air intake structure 1331a, each U-shaped air intake structure 1331a includes a U-shaped grille 1331b and multiple connecting parts 1331c. The multiple connecting parts 1331c are spaced apart and connected to the outer edge of the U-shaped grille 1331b. The outermost U-shaped air intake structure 1331a is connected to the outer casing 13 via the connecting parts 1331c. Adjacent U-shaped air intake structures 1331a are connected via the connecting parts 1331c, and the interval between two adjacent connecting parts 1331c is used to form a first air intake hole 1331d. For each annular air intake structure, each annular air intake structure includes an annular grille and multiple connecting parts. The multiple connecting parts are spaced apart and connected to the outer edge of the annular grille. The outermost annular air intake structure is connected to the outer casing 13 via the connecting parts. Adjacent annular air intake structures are connected via the connecting parts, and the interval between two adjacent connecting parts is used to form a first air intake hole 1331d. By designing the first air inlet 1331d and the second air inlet 1332a, the turbine blades 211 are arranged on opposite sides along their axial direction as air inlet sides, drawing in air through the first air inlet 1331d and the second air inlet 1332a respectively. The air is then combined around the outer periphery of the turbine blades 211 and thrown out radially along the turbine blades 211, finally being expelled from the air outlet 135, thus forming a continuous airflow. By designing the first air inlet 1331d and the second air inlet 1332a, not only can air flow smoothly into the housing 13 from the first air inlet 1331d and the second air inlet 1332a under the rotation of the turbine blades 211, but it can also effectively reduce or even avoid the possibility of users' hair getting tangled on the turbine blades 211.

[0033] like Figures 1-4 As shown, the outer casing 13 includes an inner side plate 13a and an outer casing body 13b connected to the edge of the inner side plate 13a. The inner side plate 13a has the aforementioned inner side surface 1322, and has a first portion 1311 and a second portion 1312. The outer casing body 13b has the aforementioned main body surface 1321. The distance between the second portion 1312 and the main body surface 1321 is less than the distance between the first portion 1311 and the main body surface 1321. This design allows an external air duct 134 recessed towards the main body surface 1321 to be effectively formed in the second portion 1312 of the inner side surface 1322 of the outer casing 13.

[0034] The inner side plate 13a and the outer shell body 13b are integrally formed and then detachably connected as one piece. The inner side plate 13a can be integrally formed, but is not limited to, by injection molding or 3D printing, and the outer shell body 13b can also be integrally formed, but is not limited to, by injection molding or 3D printing. The specific detachable connection method between the inner side plate 13a and the outer shell body 13b is not limited here; designers can design it reasonably according to actual needs. For example, the inner side plate 13a can be fixedly connected to the outer shell body 13b by at least one of the following methods: screw connection, snap-fit ​​connection, or plug-in connection. Designing the inner side plate 13a and the outer shell body 13b to be integrally formed reduces the processing difficulty of the inner side plate 13a and the outer shell body 13b; designing the inner side plate 13a and the outer shell body 13b to be detachably connected facilitates the replacement of damaged components such as the turbine fan blade 211 later.

[0035] like Figure 3 As shown, the neck fan 1 also includes an electronic control component 31, which is located between the second part 1312 and the main body surface 1321 and is electrically connected to the fan blade assembly 21. The specific installation method between the electronic control component 31 and the housing 13 is not limited here; designers can design it reasonably according to actual needs. For example, the electronic control component 31 can be detachably fixed to the housing 13 by at least one of the following methods: screwing, snap-fitting, or plugging. Alternatively, the electronic control component 31 can be non-detachably fixed to the housing 13 by riveting or gluing. The electronic control component 31 includes a circuit board and a controller mounted on the circuit board. The motor of the fan blade assembly 21 is electrically connected to the controller through the circuit board.

[0036] Of course, the neck fan 1 also includes a trigger 50 disposed on the housing 13, and the trigger 50 is electrically connected to the circuit board. For example... Figure 1 As shown, the trigger 50 includes a button 51. Users can press the button 51 to turn the motor on or off, and also to adjust the motor speed, thus achieving multi-level airflow adjustment of the neck fan 1. Figure 7 As shown, the trigger 50 includes a first knob 52, which the user can turn on or off the motor by rotating. The user can also adjust the motor speed by rotating the first knob 52 to achieve multi-level adjustment of the airflow of the neck fan 1. Figure 8 As shown, the trigger 50 includes a second knob 53. The user can turn the second knob 53 to turn the motor on or off. The user can also turn the second knob 53 to adjust the speed of the motor, so as to realize the multi-level adjustment of the air volume of the neck fan 1.

[0037] like Figure 1 , Figure 3 and Figure 9As shown, the neck fan 1 also includes a flexible connector 41 connecting the first fan body 11 and the second fan body 12. The two ends of the flexible connector 41 are respectively sleeved and connected to the periphery of the first fan body 11 and the second fan body 12. The flexible connector 41 can be, but is not limited to, a silicone connector, a plastic connector, a rubber connector, etc.

[0038] Specifically, the flexible connector 41 includes a connecting body 411 and at least one neck support 412. The two ends of the connecting body 411 are respectively sleeved and connected to the ends of the first fan body 11 and the second fan body 12. At least one neck support 412 is connected to the side of the connecting body 411 closest to the neck. The at least one neck support 412 forms an air inlet gap 41a with the connecting body 411, communicating with the external air duct 134. This design allows air from the external air duct 134 of the first fan body 11 and the second fan body 12 to enter the air inlet gap 41a, thereby preventing direct contact between the neck and the outer casing 13 of the first fan body 11 or the second fan body 12, which would otherwise prevent air from reaching the skin surface of the neck.

[0039] In this embodiment, at least one neck support portion 412 includes a first neck support portion 4121 and a second neck support portion 4122. The first neck support portion 4121 is disposed adjacent to the first fan body 11 and is used to form a first air inlet gap 41b between itself and the connecting body 411. The second neck support portion 4122 is disposed adjacent to the second fan body 12 and is used to form a second air inlet gap 41c between itself and the connecting body 411. The surfaces of the first neck support portion 4121 and the second neck support portion 4122 away from the connecting body 411 also have a plurality of protrusions 413. The plurality of protrusions 413 are used to create a gap between at least one neck support portion 412 and the skin of the human neck, and also to prevent the human neck from directly contacting the outer shell 13 of the first fan body 11 or the outer shell 13 of the second fan body 12, which would prevent air from being delivered to the surface of the neck skin. The surfaces of the first neck support portion 4121 and the second neck support portion 4122 away from the connecting portion 1331c are arc-shaped. The protrusion 413 in the middle region of the arc-shaped surface is larger, while the protrusions 413 in the regions on both sides of the arc-shaped surface are smaller. The connecting body 411, the first neck support portion 4121, and the second neck support portion 4122 are all made of flexible materials. If they are all made of the same flexible material (such as flexible silicone material) and are integrally molded, a more comfortable wearing effect can be achieved.

[0040] Furthermore, the connecting body 411 includes a main body portion 411a, a first extension portion 411b, and a second extension portion 411c. The main body portion 411a has a mounting hole 411d. The first extension portion 411b and the second extension portion 411c are respectively connected to the two ends of the main body portion 411a. The first extension portion 411b is used to cover the inner surface 131 of the outer shell 13 connected to the first fan body 11 that is close to the human neck. The second extension portion 411c is used to cover the inner surface 131 of the outer shell 13 connected to the second fan body 12 that is close to the human neck.

[0041] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they 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. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0042] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A neck fan, characterized in that, It includes a second fan body and a first fan body for respectively disposed on both sides of the human neck, and both the first fan body and the second fan body include: The outer casing has an inner surface near the neck of the human body and an outer surface opposite to the inner surface. The inner surface includes a first portion at one end and a second portion connecting the first portion and the connection between the first fan body and the second fan body. At least one of the first portion and the outer surface has an air inlet. The second portion is recessed towards the outer surface to form an external air guide duct. An air outlet is provided at one end of the external air guide duct near the first portion. A fan blade assembly is disposed in the housing and located between the first part and the outer surface. The fan blade assembly includes a turbine fan blade arranged along the direction from the inner surface to the outer surface of the fan shaft. The turbine fan blade is used to guide the air from the air inlet to the air outlet. The air from the air outlet is used to blow the air towards the neck of the human body via the external air guide duct.

2. The neck fan as described in claim 1, characterized in that, The external air duct extends from the end of the second part near the first part to the connection between the first fan body and the second fan body.

3. The neck fan as described in claim 1, characterized in that, The second part includes an end face connecting to the first part and an air guide surface connecting to the end face. The air outlet is disposed on the end face. The cross-section of the air guide surface is a concave U-shape, and the width of the U-shape gradually decreases along the direction from the end face to the connection.

4. The neck fan as described in claim 1, characterized in that, The outer surface includes a main surface and a side surface connected to the periphery of the main surface and located between the main surface and the inner surface. The axial direction of the turbine blade is from the first portion to the main surface. At least one of the first portion and the main surface has the air inlet. The distance from the first portion to the main surface is less than the width of the first portion.

5. The neck fan as described in claim 4, characterized in that, The air inlet includes a first air inlet and a second air inlet, and the first part and the part of the main body surface corresponding to the first part respectively have the first air inlet and the second air inlet.

6. The neck fan as described in claim 5, characterized in that, The first air inlet includes multiple U-shaped or annular air inlet structures arranged sequentially from the center to the edge of the first part, and each air inlet structure includes multiple first air inlets along the extension direction of the air inlet structure; the second air inlet includes multiple second air inlets.

7. The neck fan as described in claim 4, characterized in that, The outer casing includes an inner side panel and an outer casing body connected to the edge of the inner side panel. The inner side panel has a first portion and a second portion, and the distance between the second portion and the surface of the body is less than the distance between the first portion and the surface of the body.

8. The neck fan as described in claim 7, characterized in that, The neck fan also includes an electronic control component, which is located between the second part and the main body surface and is electrically connected to the fan blade assembly.

9. The neck fan as described in claim 7, characterized in that, The inner side panel and the outer shell body are integrally formed and then detachably connected as one unit.

10. The neck fan as described in claim 1, characterized in that, The neck fan also includes a flexible connector connected between the first fan body and the second fan body. The two ends of the flexible connector are respectively sleeved and connected to the periphery of the first fan body and the second fan body. The flexible connector includes a connecting body and at least one neck support portion connected to the side of the connecting body near the human neck. The at least one neck support portion is used to form an air intake gap with the connecting body that communicates with the external air guide duct.

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