A neck-hung fan

Abstract

The application discloses a neck-hung fan, which comprises a first shell and two groups of second shells symmetrically arranged at two ends of the first shell. A neck support structure is arranged on the bottom support of the first shell, which provides support for the neck-hung fan when the user wears the neck-hung fan on the neck. The bottom end of the second shell is provided with an air inlet, and a involute air inlet duct is arranged in the inner cavity of the second shell corresponding to the air inlet. The air inlet duct is spirally expanded along the rotating direction of the fan impeller. The inner cavities of the first shell and the second shell are formed with a tapered air outlet duct which is communicated with the air inlet duct. The air outlet of the air outlet duct is arranged on the same side wall of the first shell and the second shell. The involute air inlet duct of the application is highly matched with the fan rotating flow field, and in combination with the tapered air outlet duct communicated therewith, high-efficiency air collection, acceleration and low-noise air supply can be realized.

Description

Technical Field

[0001] This application relates to the technical field of portable fans, and in particular to a neck-hanging fan. Background Technology

[0002] Existing neck fan ducts mostly employ a single streamlined curved surface design, merely reducing vortices through a smooth inner wall without optimizing the duct shape to suit the fan's rotational characteristics. This results in airflow being limited to one or both sides, leading to low airflow intake efficiency. Straight or constant-section spiral ducts, in particular, cannot adapt to the involute velocity distribution generated by the impeller rotation, resulting in significant vortices, backflow, and high noise. Simultaneously, constant-section or expanding air outlet channels cause airflow to significantly diffuse before reaching the neck, resulting in insufficient effective airflow distance. Users must manually increase the speed, shortening runtime. To increase airflow, conventional solutions require additional regulating valves, booster fans, or complex grilles, increasing the number of parts by more than 20%, which is detrimental to lightweight design and mass production.

[0003] Therefore, there is an urgent need in the market for a new type of air duct structure that can highly match the fan's rotating airflow field and achieve efficient air collection, acceleration, and low-noise air delivery without the need for additional adjustment components. Utility Model Content

[0004] The purpose of this application is to provide a neck fan with a duct structure that can highly match the fan's rotating airflow field and achieve efficient air collection, acceleration, and low-noise air delivery without the need for additional adjustment components.

[0005] This application provides a neck fan, which includes a first housing and two sets of second housings symmetrically arranged at both ends of the first housing. The bottom support of the first housing is provided with a neck support structure to provide support for the neck fan when the user wears the neck fan around their neck.

[0006] The bottom of the second housing is provided with an air inlet, and an involute-shaped air inlet duct is provided in the inner cavity of the second housing corresponding to the air inlet. The air inlet duct is spirally unfolded along the rotation direction of the fan impeller, and the air inlet is arranged around the top, bottom and side of the fan impeller.

[0007] The inner cavities of the first and second housings form a tapered air outlet duct that communicates with the air inlet duct. The air outlet of the air outlet duct is located on the same side wall of the first and second housings. The air outlet duct starts at the end that communicates with the air inlet duct and ends at the central axis of the first housing, with the flow cross-sectional area continuously decreasing from the starting point to the ending point.

[0008] Furthermore, the air inlet includes a first air inlet, a second air inlet, and a third air inlet. The first air inlet and the second air inlet are located on two opposite side walls of the second housing, and the third air inlet is located on the side wall of the second housing where no air outlet is provided, so that the inlet section of the air inlet duct simultaneously covers the top, bottom, and sides of the fan impeller, forming a 360° air collection ring cavity.

[0009] Furthermore, the base circle radius of the air inlet duct varies from 3mm to 8mm, and the spiral expansion angle varies from 120° to 150°.

[0010] Furthermore, the first air inlet is equipped with a dustproof grille with a pore size of 3mm, and the gap between the dustproof grille and the first air inlet is less than or equal to 5mm.

[0011] Furthermore, the air outlet is composed of multiple rectifier grilles, which are used to constrain the airflow accelerated after passing through the air outlet duct into a flat air curtain.

[0012] Furthermore, the outlet edge corner of the air duct is an arc-shaped curved surface, with the radius of the arc-shaped curved surface varying from 0.5mm to 3mm;

[0013] The total length of the air outlet duct is 20mm, and the diameter and height of the air outlet duct vary from 11mm to 7mm.

[0014] Furthermore, the interior of the first housing is provided with a first wind-gathering plate and a second wind-gathering plate extending axially and radially. The first wind-gathering plate, the second wind-gathering plate, and the inner wall of the first housing form a sub-cavity to perform secondary pressurization of the airflow.

[0015] Furthermore, the inner cavity of the second housing is also provided with streamlined guide ribs, which together with the inner wall of the second housing on the side where the air outlet is located form part of the air outlet duct.

[0016] The guide ribs and the inner wall of the other side of the second housing together form the power compartment, which is used to house the battery and the control circuit board.

[0017] Furthermore, the air inlet duct and the air outlet duct are coaxially connected so that the airflow flowing in through the air inlet smoothly transitions to the air outlet duct along a spiral trajectory.

[0018] Furthermore, a slot is provided at the bottom of the first housing, and a protrusion is provided on the side of the neck support structure near the first housing, with the protrusion fitting into the slot; a flexible support structure is covered on the side of the neck support structure away from the first housing; wherein the neck support structure is arc-shaped, and the curvature of the neck support structure is designed based on the size of the human neck.

[0019] Unlike existing technologies, the neck fan of this application includes a first housing and two sets of second housings symmetrically arranged at both ends of the first housing. The bottom end of the second housing is provided with an air inlet, and an involute-shaped air inlet duct is provided in the inner cavity of the second housing corresponding to the air inlet. The air inlet duct is spirally unfolded along the rotation direction of the fan impeller, which is highly adaptable to the rotation of the fan impeller. At the same time, the air inlet is arranged around the top, bottom and sides of the fan impeller, which solves the problems of single air collection direction and low air collection efficiency, and realizes multi-dimensional high-efficiency air collection.

[0020] Furthermore, the inner cavities of the first and second housings form a tapered air outlet duct that communicates with the air inlet duct. This tapered air outlet duct utilizes the Venturi effect to effectively increase the outlet air velocity and overall efficiency without the need for additional pressurization components, while reducing structural redundancy. Simultaneously, the duct and housing are integrally molded, reducing the need for traditional regulating valves, auxiliary fans, and other parts, effectively lightening the overall weight and making it easier for users to wear for extended periods.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0023] Figure 1 This is a first structural schematic diagram of an embodiment of the neck fan of this application;

[0024] Figure 2 This is a second structural schematic diagram of an embodiment of the neck fan of this application;

[0025] Figure 3 This is a third structural schematic diagram of an embodiment of the neck fan of this application;

[0026] Figure 4 This is an exploded structural diagram of the neck fan of this application;

[0027] Figure 5 yes Figure 1 A cross-sectional view of the neck fan along the AA direction;

[0028] Figure 6 yes Figure 2 A cross-sectional view of the neck fan along the BB direction;

[0029] Icon labels:

[0030] 1-Neck-hanging fan; 10-First housing; 11-First air concentrator; 12-Second air concentrator; 13-Card slot; 20-Second housing; 21-First air inlet; 22-Second air inlet; 23-Third air inlet; 24-Dustproof grille; 25-Guide ribs; 26-Power supply compartment; 30-Neck support structure; 31-Protrusion; 32-Flexible support structure; 40-Air inlet duct; 50-Air outlet duct; 51-Rectifying grille; 60-Fan impeller; 70-Control circuit board; 71-Interface. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of this application, the neck fan provided in this application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It is understood that the described embodiments are merely some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0032] The terms "first," "second," etc., used in this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0033] Because existing neck fans generally use simple cylindrical or flat air ducts, when used with high-speed rotating centrifugal / axial fans, they suffer from problems such as a single air collection direction, mismatch between the air duct and the rotating flow field, rapid wind speed decay, obvious air delivery blind spots, and structural redundancy. Therefore, this application provides a neck fan with an involute inlet air duct and a tapered outlet air duct. The involute inlet air duct is highly matched with the fan's rotating flow field, and combined with the tapered outlet air duct connected to it, it can achieve efficient air collection, acceleration, and low-noise air delivery.

[0034] Please see Figures 1-6 , Figure 1 This is a first structural schematic diagram of an embodiment of the neck fan of this application. Figure 2 This is a second structural schematic diagram of an embodiment of the neck fan of this application. Figure 3 This is a third structural schematic diagram of an embodiment of the neck fan of this application. Figure 4 This is an exploded structural diagram of the neck fan of this application. Figure 5 yes Figure 1 A cross-sectional diagram of the neck fan along the AA direction. Figure 6 yes Figure 2 A cross-sectional view of the neck fan along the BB direction.

[0035] like Figures 1-6 As shown, the neck fan 1 of this application includes a first housing 10 and two sets of second housings 20 symmetrically arranged at both ends of the first housing 10. The bottom support of the first housing 10 is provided with a neck support structure 30, which is used to provide support for the neck fan 1 when the user wears the neck fan 1 around the neck.

[0036] Specifically, such as Figure 5 As shown, the bottom of the first housing 10 is provided with a slot 13, and the neck support structure 30 is provided with a protrusion 31 on the side near the first housing 10. The protrusion 31 is fitted into the slot 13 to fix the neck support structure 30 to the bottom of the first housing 10.

[0037] The neck support structure 30 is covered with a flexible support structure 32 on the side opposite to the first housing 10. The flexible support structure 32 can simultaneously meet the requirements of being lightweight, skin-friendly, sweat-resistant, UV-resistant, washable, and having moderate resilience and shape retention. This application does not limit its materials.

[0038] Optionally, the neck support structure 30 is arc-shaped, and the curvature of the neck support structure 30 is designed based on the size of the human neck, so that it can perfectly fit the back of the user's neck, especially when the user wears the neck fan 1.

[0039] Optionally, in this embodiment, the first housing 10 may be composed of two sub-housings with the same structure, and the two sub-housings are formed by ultrasonic welding. The weld seam is located on the outer peripheral wall of the two sub-housings, which can prevent air leakage and whistling.

[0040] This application provides two sets of second housings 20, each with an identical structure, and each set is fixed to the first housing 10 via a snap-fit ​​mechanism. The two sets of second housings 20, together with the first housing 10, form an arc-shaped structure that conforms to the human neck structure.

[0041] Each of the second housings 20 is equipped with an involute-shaped air inlet duct 40 and a tapered air outlet duct 50 inside.

[0042] Specifically, such as Figure 3 As shown, an air inlet is provided at the bottom of the second housing 20, and an involute-shaped air inlet duct 40 is provided in the inner cavity of the second housing 20 corresponding to the air inlet. The air inlet duct 40 is spirally unfolded along the rotation direction of the fan impeller 60.

[0043] Among them, the involute-shaped air inlet duct 40 unfolds smoothly in an Archimedean spiral shape along the rotation direction of the fan impeller 60, and is used to converge tangential airflow in three dimensions.

[0044] Optionally, in this embodiment, the base circle radius of the air inlet duct 40 varies from 3mm to 8mm, and the spiral expansion angle varies from 120° to 150°.

[0045] like Figure 4 As shown, the air inlet includes a first air inlet 21, a second air inlet 22, and a third air inlet 23. The first air inlet 21 and the second air inlet 22 are located on two opposite side walls of the second housing 20, and the third air inlet 23 is located on the side wall of the second housing 20 where no air outlet is provided, so that the inlet section of the air inlet duct 40 simultaneously covers the top, bottom, and sides of the fan impeller 60, forming a 360° air collection ring cavity.

[0046] This embodiment solves the problem that existing neck fans have a single air collection direction and only arrange the air inlets on one side of the impeller, which cannot make full use of the three-dimensional tangential airflow at the blade tip, blade root and both sides. By setting a first air inlet 21, a second air inlet 22 and a third air inlet 23 covering the top, bottom and sides of the fan impeller 60, this embodiment can reduce the theoretical air intake loss by more than 30%.

[0047] Meanwhile, the involute air inlet duct 40 is adapted to the rotating flow field, solving the problem that straight or constant cross-section spiral ducts cannot adapt to the involute linear velocity distribution generated by the impeller rotation, resulting in obvious eddies and backflow, and can effectively reduce noise.

[0048] like Figure 4 As shown, the first air inlet 21 is equipped with a dustproof grille 24 with a hole diameter of 3mm. The gap between the dustproof grille 24 and the first air inlet 21 is less than or equal to 5mm, which can balance safety and air collection efficiency.

[0049] like Figure 3 As shown, the inner cavities of the first housing 10 and the second housing 20 form a tapered air outlet duct 50 that communicates with the air inlet duct 40, and the air outlet of the air outlet duct 50 is located on the same side wall of the first housing 10 and the second housing 20.

[0050] Optionally, in this embodiment, the air inlet duct 40 and the air outlet duct 50 are coaxially connected so that the airflow flowing in through the air inlet smoothly transitions to the air outlet duct 50 along a spiral trajectory. The air inlet duct 40 and the air outlet duct 50 form an "involute-contraction" coupled air path, which effectively improves the overall energy efficiency ratio and reduces outlet noise.

[0051] The air outlet duct 50 starts at the end that connects with the air inlet duct 40 and ends at the central axis of the first housing 10, with the flow cross-sectional area continuously decreasing from the starting point to the ending point.

[0052] In this embodiment, the cross-sectional area of ​​the tapered air outlet duct 50 continuously decreases along the air outlet direction to utilize the Venturi effect to increase the outlet air velocity. This solves the problem that in a constant cross-section or expanding air outlet duct, the airflow has already significantly diffused before reaching the neck, resulting in insufficient effective airflow and requiring the user to manually increase the speed, thus shortening the runtime.

[0053] The outlet edge corner of the air outlet duct 50 is an arc-shaped curved surface with a radius ranging from 0.5mm to 3mm. The total length of the air outlet duct 50 is 20mm, and the diameter and height of the air outlet duct 50 range from 11mm to 7mm.

[0054] Specifically, the air outlet consists of multiple rectifier grilles 51, which are used to constrain the airflow accelerated by the air outlet duct 50 into a flat air curtain. Optionally, the angle of the gratings of the rectifier grilles 51 is adjustable to change the direction of the air curtain and adapt to the comfort zone of users with different neck circumferences.

[0055] Optionally, in this embodiment, the cone angle α of the air outlet duct satisfies 3°≤α≤15° (the half cone angle β satisfies 1.5°≤β≤7.5°), which can utilize the Venturi effect to obtain about 25% static pressure-dynamic pressure conversion, while avoiding flow separation and additional noise caused by an excessively steep cone angle.

[0056] Unlike existing neck fans that mostly use round holes or narrow slits for their air outlets, which cause the airflow to shoot out in a columnar shape and make it difficult to cover the back and sides of the neck, resulting in poor comfort, this embodiment uses multiple rectifier grilles 51 to form the air outlet, and the air outlet is designed in an arc shape, so that the airflow can flow closely along the curve of the neck, greatly improving the air supply coverage and eliminating the blind spot behind the neck.

[0057] like Figure 3 As shown, the inner cavity of the second housing 20 is also provided with streamlined guide ribs 25. The guide ribs 25 and the inner wall of the second housing 20 on the side where the air outlet is located together form part of the air outlet duct 50, as shown. Figure 5 and Figure 6 As shown, the interior of the first housing 10 is provided with a first wind concentrator 11 and a second wind concentrator 12 extending axially and radially. The first wind concentrator 11, the second wind concentrator 12 and the inner wall of the first housing 10 form a sub-cavity to perform secondary pressurization of the airflow.

[0058] This application achieves integrated molding of the air duct and the housing by designing the internal air duct, reducing the need for traditional regulating valves, auxiliary fans, and other parts. This increases the airflow speed while reducing the overall weight, which is beneficial for lightweighting and mass production.

[0059] like Figure 3As shown, in this embodiment, the guide rib 25 and the inner wall of the second housing 20 on the side without an air outlet together constitute the power supply compartment 26, which is used to house the battery (not shown) and the control circuit board 70. Optionally, the power supply compartment 26 can be filled with porous sound-absorbing material to suppress impeller aerodynamic noise.

[0060] Optionally, an interface 71 may be provided on the side of the second housing 20 where the air outlet is located, for electrical connection with the control circuit board 70 inside the power supply compartment 26.

[0061] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A neck fan, characterized in that, The neck fan includes a first housing and two sets of second housings symmetrically arranged at both ends of the first housing. The bottom support of the first housing is provided with a neck support structure to provide support for the neck fan when the user wears the neck fan around their neck. The bottom end of the second housing is provided with an air inlet, and an involute-shaped air inlet duct is provided in the inner cavity of the second housing corresponding to the air inlet. The air inlet duct is spirally unfolded along the rotation direction of the fan impeller, wherein the air inlet is arranged around the top, bottom and side of the fan impeller. The inner cavities of the first housing and the second housing form a tapered air outlet duct that communicates with the air inlet duct. The air outlet of the air outlet duct is located on the same side wall of the first housing and the second housing. The air outlet duct starts at the end that communicates with the air inlet duct and ends at the central axis of the first housing, with the flow cross-sectional area continuously decreasing from the starting point to the ending point.

2. The neck fan according to claim 1, characterized in that, The air inlet includes a first air inlet, a second air inlet, and a third air inlet. The first air inlet and the second air inlet are located on two opposite side walls of the second housing, and the third air inlet is located on the side wall of the second housing where the air outlet is not located, so that the inlet section of the air inlet duct simultaneously covers the top, bottom, and sides of the fan impeller, forming a 360° air collection ring cavity.

3. The neck fan according to claim 2, characterized in that, The base circle radius of the air inlet duct varies from 3mm to 8mm, and the spiral expansion angle varies from 120° to 150°.

4. The neck fan according to claim 2, characterized in that, The first air inlet is equipped with a dustproof grille with a pore size of 3mm and a gap of less than or equal to 5mm between the dustproof grille and the first air inlet.

5. The neck fan according to claim 1, characterized in that, The air outlet is composed of multiple rectifier grilles, which are used to constrain the airflow accelerated after passing through the air outlet duct into a flat air curtain.

6. The neck fan according to claim 5, characterized in that, The outlet edge corner of the air duct is an arc-shaped curved surface, and the radius of the arc-shaped curved surface varies from 0.5mm to 3mm. The total length of the air outlet duct is 20mm, and the diameter and height of the air outlet duct vary from 11mm to 7mm.

7. The neck fan according to claim 1, characterized in that, The first housing has a first wind-gathering plate and a second wind-gathering plate extending axially and radially inside. The first wind-gathering plate, the second wind-gathering plate and the inner wall of the first housing form a sub-cavity to perform secondary pressurization of the airflow.

8. The neck fan according to claim 7, characterized in that, The inner cavity of the second housing is also provided with streamlined guide ribs, which together with the inner wall of the second housing on the side where the air outlet is located form part of the air outlet duct; The guide ribs and the inner wall of the other side of the second housing together form a power compartment for housing the battery and control circuit board.

9. The neck fan according to claim 3, characterized in that, The air inlet duct and the air outlet duct are coaxially connected so that the airflow flowing in through the air inlet smoothly transitions to the air outlet duct along a spiral trajectory.

10. The neck fan according to claim 1, characterized in that, The bottom of the first housing is provided with a slot, and the neck support structure is provided with a protrusion on the side near the first housing, the protrusion being fitted into the slot; the side of the neck support structure opposite to the first housing is covered with a flexible support structure; wherein the neck support structure is arc-shaped, and the curvature of the neck support structure is designed based on the size of the human neck.

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