Portable fan with cooling function

Abstract

The utility model discloses a portable fan with a cooling function, which comprises a fan shell, an air inlet and an air outlet which are oppositely arranged, and an air inlet and an air outlet which are oppositely arranged are formed in the fan shell; the fan assembly is assembled in the fan shell body; an expansion space is arranged between the air outlet end of an air fan blade in the fan assembly and the air outlet, and the area of a flow channel for airflow to pass through in the radial section of the inlet end of the expansion space is smaller than that of a flow channel for airflow to pass through in the radial section of the outlet end of the expansion space. When air flow passes through the expansion space from the air outlet end of the fan blade, as the flow channel area of the inlet end of the expansion space is smaller than that of the outlet end of the expansion space, the air flow can undergo a rapid expansion process from high pressure to low pressure in the expansion space. According to the thermodynamic principle, the gas absorbs heat in the expansion process, so that the temperature of the gas flow is reduced.

Description

Technical Field

[0001] This application relates to the field of fans, and more particularly to a portable fan with a cooling function. Background Technology

[0002] In the hot summer, fans have become an essential item for people to relieve the heat. With people's demand for convenient use, lighter and more portable fans are becoming increasingly popular.

[0003] In existing technologies, portable fans rely on motors to drive fan blades to generate airflow. Their cooling principle is entirely based on the evaporation effect caused by airflow, but they cannot reduce the temperature of the airflow itself. Due to these limitations, there is an urgent need to overcome the cooling problem while maintaining portability. Utility Model Content

[0004] The purpose of this application is to provide a portable fan with a cooling function.

[0005] This application provides a portable fan with a cooling function, comprising:

[0006] A fan housing, wherein an air inlet and an air outlet are provided on the fan housing and are arranged opposite to each other;

[0007] A fan assembly, which is assembled within the fan housing;

[0008] An expansion space is provided between the air outlet end of the fan blades and the air outlet in the fan assembly. The flow channel area for airflow in the radial section of the inlet end of the expansion space is smaller than the flow channel area for airflow in the radial section of the outlet end of the expansion space.

[0009] Optionally, a plurality of first stationary blades are provided inside the fan assembly or on the mounting base connected to the fan assembly, and a plurality of second stationary blades are provided at the air outlet position of the fan housing, and the expansion space is provided within the space formed by the plurality of second stationary blades.

[0010] Optionally, along the direction from the air inlet to the air outlet, each of the plurality of second stationary blades is provided with a first end and a second end, the width of the first end being smaller than the width of the second end, so as to form the expansion space.

[0011] Optionally, the expansion space is disposed between the mounting base and the air outlet, and the expansion space is enclosed by the inner wall of the fan housing.

[0012] Optionally, the expansion space is disposed between the second stationary blade and the air outlet, and the fan housing between the second stationary blade and the air outlet is radially enlarged.

[0013] Optionally, the fan housing includes: a first housing and a second housing, wherein the first housing is sleeved on the second housing, and the air inlet is disposed on the second housing.

[0014] Optionally, the first housing is made of a transparent or translucent material; and / or,

[0015] Identification information is provided on the inner surface of the first housing and / or the outer surface of the second housing; and / or,

[0016] A light strip is provided on the first housing or the second housing.

[0017] Optionally, the fan housing further includes: a third housing, which is inserted into the second housing, the air outlet is disposed on the third housing, and the plurality of second stationary blades are disposed on the third housing.

[0018] Optionally, the inner surface of the second housing is provided with a first fastening element, and the outer surface of the third housing is provided with a second fastening element that cooperates with the first fastening element; and / or,

[0019] The bottom surface of the first housing has a first opening, and a bottom cover plate is provided at the first opening. The bottom cover plate is connected to the second housing, and the bottom cover plate abuts against the first housing.

[0020] Optionally, the first housing covers the corresponding position of the first fastener to limit the deformation space of the first fastener; and / or,

[0021] A third fastener is provided on the bottom cover plate, and a slot is provided on the second housing to cooperate with the third fastener. The third fastener is fastened to the slot and / or the edge of the second housing; and / or,

[0022] The second housing has a second opening, which communicates with the first opening, and the opening area of ​​the second opening is smaller than the opening area of ​​the first opening; and / or,

[0023] The first fastener consists of multiple claws, with any one claw forming a triangular stable structure with its two adjacent claws. The second fastener consists of multiple slots, with any one slot forming a triangular stable structure with its two adjacent slots.

[0024] The beneficial effects of this embodiment are as follows: When airflow passes through the expansion space from the outlet end of the fan blades, because the flow channel area at the inlet end of the expansion space is smaller than that at the outlet end, the airflow undergoes a rapid expansion process from high pressure to low pressure within the expansion space. According to thermodynamic principles, the gas absorbs heat during the expansion process, thereby lowering the temperature of the airflow. This design makes the air blown by the fan cooler, providing users with a more comfortable cooling experience. The existence of the expansion space not only changes the temperature of the airflow but also plays a crucial role in the distribution of the airflow. Due to the smaller flow channel area at the inlet end, the airflow diffuses rapidly after entering the expansion space, filling the entire expansion space. This diffusion ensures that the airflow is fully mixed and evenly distributed before reaching the outlet, avoiding the problems of concentrated airflow and uneven blowing that may occur in traditional fans. The airflow dispersed by the expansion space can form a wider air surface at the outlet, significantly improving the coverage area of ​​the airflow. This means that when using this portable fan, users can feel a uniform and cool breeze no matter which direction they are facing. This avoids the discomfort caused by users having to frequently change the direction of the fan due to the concentrated airflow from the close proximity of the user to the body, and the discomfort caused by the "wind knife" effect of the concentrated airflow from the high-speed airflow. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0026] Figure 1 This is a schematic diagram of the overall structure of a portable fan according to a specific embodiment of this application;

[0027] Figure 2 This is a cross-sectional schematic diagram of a portable fan according to a specific embodiment of this application;

[0028] Figure 3 This is an enlarged schematic diagram of region A in a specific embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the structure of the first housing according to a specific embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the structure of the second housing according to a specific embodiment of this application;

[0031] Figure 6 This is a first-view structural diagram of the third housing according to a specific embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the structure of the bottom cover plate according to a specific embodiment of this application;

[0033] Figure 8This is a second-view structural diagram of the third housing according to a specific embodiment of this application.

[0034] Figure Descriptions: 1. Fan housing; 11. First housing; 111. First opening; 12. Second housing; 121. First fastener; 121a. Claw; 122. Housing edge; 123. Second opening; 124. Bayonet; 13. Third housing; 131. Second fastener; 131a. Slot; 14. Bottom cover; 141. Third fastener; 15. Air inlet; 16. Air outlet; 17. Mounting base; 171. Second stationary blade; 171a. First end; 171b. Second end; 2. Fan assembly; 21. First stationary blade; 22. Fan motor; 23. Fan blade; 3. Expansion space; 31. Inlet end; 32. Outlet end. Detailed Implementation

[0035] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0037] like Figures 1-3 As shown, a portable fan with cooling function includes: a fan housing 1, on which an air inlet 15 and an air outlet 16 are provided opposite to each other; a fan assembly 2, which is assembled inside the fan housing 1; an expansion space 3 is provided between the air outlet end of the fan blade 23 in the fan assembly 2 and the air outlet 16, and the flow channel area for airflow in the radial section of the inlet end 31 of the expansion space 3 is smaller than the flow channel area for airflow in the radial section of the outlet end 32 of the expansion space 3.

[0038] The fan housing 1 in this embodiment includes a first housing 11, a second housing 12, and a third housing 13. The first housing 11 is fitted onto the second housing 12, and the third housing 13 is inserted into the second housing 12. The fan assembly 2 is connected to the third housing 13, and each air inlet penetrates both the first housing 11 and the second housing 12. However, the structure of the fan housing 1 is not limited to this. Depending on the specific application scenario, in some embodiments, the fan housing 1 can be formed by splicing two half-housings front and back or top and bottom; in some embodiments, the fan housing 1 can be formed by splicing three or more housings. There are many ways to assemble the fan housing 1, and users can choose according to their needs, which is not limited here.

[0039] Fan assembly 2 includes a fan motor 22 and fan blades 23. The motor assembly can be (but is not limited to): a single-phase motor, a two-phase motor, or a three-phase motor. The structure of fan assembly 2 can be an external rotor or an internal rotor.

[0040] In this embodiment, the fan assembly 2 has a modular structure. Specifically, the fan assembly 2 includes a motor housing, a fan motor 22, and fan blades 23. The fan motor 22 and fan blades 23 are disposed within the motor housing, and a plurality of first stationary blades 21 are also disposed within the motor housing. However, the structure of the fan assembly 2 is not limited to this. Depending on the specific application scenario, in some embodiments, the fan assembly 2 includes a fan motor 22 and fan blades 23. A mounting base 17 is provided inside the fan housing 1, the fan motor 22 is connected to the mounting base 17, the fan blades 23 are connected to the fan motor 22, and the plurality of first stationary blades 21 are connected between the fan housing 1 and the mounting base 17.

[0041] In this embodiment, the expansion space 3 can be multiple independent spaces that are divided. However, the shape of the expansion space 3 is not limited to this. Depending on the specific application scenario, in some embodiments, the expansion space 3 can be an independent and complete space.

[0042] In this embodiment, the expansion space 3 is disposed between multiple stationary blades. The first end 171a of the multiple second stationary blades 171 is the inlet end 31 of the expansion space 3, and the second end 171b of the multiple second stationary blades 171 is the outlet end 32 of the expansion space 3. The width of the first end 171a is smaller than the width of the second stationary blades 171. However, the location of the expansion space 3 is not limited to this. In some embodiments, the expansion space 3 is disposed between the mounting base 17 and the air outlet 16. In some embodiments, the expansion space 3 is disposed between the fan blade 23 and the mounting base 17. The expansion space 3 can be disposed at any position from the fan blade 23 to the air outlet 16. Depending on the product space layout, the user can set it according to actual needs, which will not be elaborated here.

[0043] In the above embodiment, when the airflow passes through the expansion space 3 from the outlet end of the fan blade 23, because the flow channel area at the inlet end 31 of the expansion space 3 is smaller than the flow channel area at the outlet end 32, the airflow undergoes a rapid expansion process from high pressure to low pressure within the expansion space 3. According to thermodynamic principles, the gas absorbs heat during the expansion process, thereby lowering the temperature of the airflow. This design makes the air blown by the fan cooler, providing users with a more comfortable cooling experience. The existence of the expansion space 3 not only changes the temperature of the airflow but also plays a crucial role in the distribution of the airflow. Due to the smaller flow channel area at the inlet end 31, the airflow diffuses rapidly after entering the expansion space 3, filling the entire expansion space 3. This diffusion ensures that the airflow is fully mixed and evenly distributed before reaching the outlet 16, avoiding the problems of concentrated airflow and uneven blowing that may occur in traditional fans. The airflow dispersed by the expansion space 3 can form a wider air surface at the outlet 16, significantly improving the coverage area of ​​the airflow. This means that when using this portable fan, users can feel a uniform and cool breeze no matter which direction they are facing. This avoids the discomfort caused by users having to frequently change the direction of the fan due to the concentrated airflow from the close proximity of the user to the body, and the discomfort caused by the "wind knife" effect of the concentrated airflow from the high-speed airflow.

[0044] In some embodiments, a plurality of first stationary blades 21 are provided inside the fan assembly 2 or on the mounting base 17 connected to the fan assembly 2, and a plurality of second stationary blades 171 are provided at the air outlet 16 of the fan housing 1, and the expansion space 3 is provided within the space enclosed by the plurality of second stationary blades 171.

[0045] In this embodiment, the number of first stationary blades 21 is (not limited to) 2, 3, 4, 5, 6, 7 or more.

[0046] In this embodiment, the number of second stationary blades 171 is (not limited to) 2, 3, 4, 5, 6, 7 or more.

[0047] A two-stage stationary blade structure is formed by setting a first stationary blade 21 inside the fan assembly 2 or on the mounting base 17, and a second stationary blade 171 at the air outlet 16 of the fan housing 1. This two-stage design effectively guides and rectifies the airflow. The first stationary blade 21 initially streamlines the airflow generated by the fan assembly 2, reducing turbulence and eddies, allowing it to flow more smoothly towards the air outlet 16. The second stationary blade 171 further optimizes the direction and velocity distribution of the airflow at the air outlet 16, ensuring that the airflow is discharged in a more uniform and stable manner. This two-stage guiding mechanism significantly improves the flow efficiency of the airflow and avoids disordered collisions and energy loss within the housing. The optimized airflow path through the two-stage stationary blades greatly improves the fan's output efficiency, enabling it to deliver stronger airflow with the same energy consumption. Simultaneously, the two-stage stationary blades effectively reduce airflow turbulence, significantly lowering the noise level during fan operation and providing users with a quieter and more comfortable experience.

[0048] The expansion space 3 is enclosed into an independent cavity by the second stationary blade 171, forming a flow channel cross-sectional area that gradually expands from the inlet to the outlet, allowing the airflow to fully decelerate and expand within the independent space. This design forces the conversion of kinetic energy into static pressure energy, significantly improving pressure recovery efficiency, reducing fan power consumption, and avoiding energy loss caused by disordered airflow diffusion. The independent expansion space 3, in conjunction with the second stationary blade 171, confines the high-speed airflow within a specific cavity, gradually releasing energy and suppressing eddies and turbulent noise generated by the airflow detaching from the wall.

[0049] like Figure 8 As shown, in some embodiments, along the direction from the air inlet 15 to the air outlet 16, each of the plurality of second stationary blades 171 is provided with a first end 171a and a second end 171b, the width of the first end 171a being smaller than the width of the second end 171b, to form an expansion space 3.

[0050] The second stationary blade 171 adopts a gradually expanding variable cross-section design (width of the first end 171a < width of the second end 171b), forming a gradient expansion space 3 at the air outlet 16. When the airflow passes through the gradually widening channel, it follows the pressure-velocity conversion law in fluid mechanics. The high-speed airflow automatically decelerates and diffuses laterally in the expansion section. The pressure relief zone causes the airflow to expand autonomously along the blade width direction, forming a fan-shaped covering flow field, thus expanding the effective air delivery angle. The negative pressure adsorption effect formed by the gradually expanding blade converts some axial kinetic energy into lateral momentum, breaking the traditional single-direction airflow jet mode of straight blades. This makes the airflow coverage wider and further solves the drawbacks of portable fans, such as small size, close proximity to the human body, concentrated airflow position, and small coverage area when the airflow speed is too high.

[0051] In some embodiments, the widths of the first end 171a and the second end 171b of the second stationary blade 171 are the same. However, the expansion space 3 is disposed between the second stationary blade 171 and the air outlet 16, and the fan housing 1 between the second stationary blade 171 and the air outlet 16 is radially increased.

[0052] Specifically, an expansion space 3 is provided at the second end 171b of the second stationary blade 171 and at the air outlet 16. The fan housing 1 between the second stationary blade 171 and the air outlet 16 is radially enlarged. In addition to the cooling effect provided by the expansion space 3 itself, the radially enlarged fan housing 1 can guide the airflow to blow towards the human body with a larger coverage area through the wall effect, thereby increasing the comfort of the human body.

[0053] In some embodiments, the expansion space 3 is disposed between the mounting base 17 and the air outlet 16, and the expansion space 3 is enclosed by the inner wall of the fan housing 1.

[0054] In this embodiment, the fan assembly 2 is positioned near the air inlet 15 of the fan housing 1, thus creating an air duct space between the fan assembly 2 and the air outlet 16. This air duct space serves as the expansion space 3. In this embodiment, the inlet of the expansion space 3 is the plane where the mounting base 17 is located. Since multiple first stationary blades 21 connect the mounting base 17 to the inner surface of the fan housing 1, the space occupied by these first stationary blades 21 reduces the space through which airflow can pass, thus forming the inlet end 31 of the expansion space 3. The outlet end 32 of the expansion space 3 is the air outlet 16 of the fan, and the space between the inlet end and the outlet end 32 is constructed in a cylindrical shape.

[0055] The spatial shape between the inlet end and the outlet end 32 is not limited to this. Depending on the specific application scenario, in some implementations, the spatial shape between the inlet end and the outlet end 32 can be (not limited to): frustum, hemisphere, cuboid, cube or other polyhedron.

[0056] The expansion space 3 is directly enclosed by the inner wall of the fan housing 1, forming a continuous, undivided cavity. Compared to segmented or blade-separated independent spaces, the overall space eliminates the obstruction of airflow by the internal structure, allowing the airflow to diffuse naturally along the inner wall of the housing. The airflow decelerates uniformly within a single cavity, improving the efficiency of kinetic energy conversion to static pressure. The overall expansion space 3 provides a full-range mixing environment for the airflow. Airflow layers with different velocities are fully mixed within the continuous cavity. The high-speed core airflow and the low-speed edge airflow form a stable shear layer under the constraint of the inner wall, automatically balancing the velocity difference through viscosity. The cooling sensation is gentler, avoiding localized strong wind stimulation, making it especially suitable for prolonged direct airflow scenarios. The continuous design of the expansion space 3 ensures that the airflow expansion follows an axisymmetric flow pattern. Through the geometric constraint of the inner wall of the housing, the pulsating problem of "sometimes strong, sometimes weak" airflow in traditional fans is avoided, improving airflow comfort.

[0057] In some embodiments, the fan housing 1 includes a first housing 11 and a second housing 12, the first housing 11 being sleeved on the second housing 12, and the air inlet 15 being disposed on the second housing 12.

[0058] like Figures 4-6 The fan housing 1 is configured as a first housing 11 and a second housing 12, with the first housing 11 fitted over the second housing 12. This connection structure creates a double-layer structure at the fitting points of the first housing 11 and the second housing 12. The second housing 12 is enclosed by the first housing 11, resulting in a larger connection area and a more stable connection between the two housings. Simultaneously, the double-layer structure provides stronger drop resistance and protection, better protecting internal functional components such as the fan motor 22.

[0059] In some embodiments, the first housing 11 is made of a transparent or translucent material.

[0060] In some embodiments, the first housing 11 is made of a transparent or translucent material. The materials used to make the first housing 11 include (but are not limited to): transparent plastic materials such as polystyrene, polymethyl methacrylate, polycarbonate, polyethylene terephthalate, transparent nylon, and AS (acrylonitrile-styrene copolymer); tempered glass; quartz; artificial optical crystals; and sapphire.

[0061] The first housing 11 is made of transparent or semi-transparent material, giving the fan housing 1 an overall transparent appearance and greatly enhancing the aesthetics of the portable fan. The first housing 11 forms a physical barrier through its sleeve structure, effectively preventing direct damage to the second housing 12 from external dust, liquid splashes, or mechanical impacts. Simultaneously, the first housing 11 reduces the oxidation effect of ultraviolet radiation on the material of the second housing 12, extending its color stability. The transparent or semi-transparent material allows the color or texture of the second housing 12 to be seen through the first housing 11, creating a sense of visual depth. For example, if the second housing 12 uses a metallic color or gradient coating, it can maintain its brightness for a long time under the protection of the first housing 11, avoiding fading or wear caused by direct exposure.

[0062] In some implementations, the transparent shell itself can be treated with processes such as frosting, gloss, raised edges, anti-slip, and partial hollowing to enhance its texture and suit the aesthetic needs of different users.

[0063] In some embodiments, identification information is provided on the inner surface of the first housing 11 and / or the outer surface of the second housing 12.

[0064] Identification information includes: specific fonts or patterns that have an indicative function, such as trademarks, logos, and product names, as well as decorative elements such as pictures, gradient layers, decals, and mirrors.

[0065] The identification information is applied to the inner surface of the first housing 11, the outer surface of the second housing 12, or the inner surface of the first housing 11 and the outer surface of the second housing 12 through processes such as (but not limited to) electroplating, spraying, pasting, painting, etc.

[0066] The identification information is set on the inner surface of the first housing 11, the outer surface of the second housing 12, or both the inner surface of the first housing 11 and the outer surface of the second housing 12. Since the relative positions of the first housing 11 and the second housing 12 do not change, the first housing 11 protects the identification information during daily use, preventing damage or wear and tear, thus preserving the information for a long time. Simultaneously, the first housing 11 is made of a transparent or semi-transparent material, allowing users to observe the identification information through it, further enhancing the aesthetics of the portable fan.

[0067] In some embodiments, by utilizing the thickness and transparency or translucency of the first housing 11, marking information is simultaneously applied to the outer surface and inner surface of the first housing 11 and / or the outer surface of the second housing 12, creating a sense of depth. For example, this can create a 3D visual effect.

[0068] In some embodiments, a light strip is provided on the first housing 11 or the second housing 12. The light strip passes through the second housing 12 and is electrically connected to the battery inside the portable fan. The light strip enables the portable fan to provide illumination. Furthermore, in nighttime environments, the illuminated light strip makes the markings more visually appealing, enhancing the overall aesthetics of the portable fan.

[0069] In some embodiments, sand, glitter, water, and vegetable oil can be disposed between the first housing 11 and the second housing 12 to enhance the aesthetics of the portable fan housing 1.

[0070] In some embodiments, the fan housing 1 further includes a third housing 13, which is inserted into the second housing 12, an air outlet 16 is disposed on the third housing 13, and a plurality of second stationary blades 171 are disposed on the third housing 13.

[0071] The connection method between the third housing 13 and the second housing 12 (not limited to): one or more of the following connection methods: interference fit, snap-fit ​​connection, screw connection, adhesive connection, etc.

[0072] A third housing 13 is provided to accommodate the functional components of the portable fan, including (but not limited to) a switch, display, fan assembly 2, battery assembly, or PCB circuit board. The third housing 13 allows some functional components to be pre-assembled within it before assembling the third housing 13 and the second housing 12. This avoids directly assembling the functional components within the second housing 12, reducing assembly difficulty.

[0073] The third housing 13 also provides support for the second housing 12 and the first housing 11, giving the fan housing 1 stronger resistance to compression and impact. The assembly structure of the three housings not only improves the physical resistance of the fan housing 1, but also enhances its aesthetics.

[0074] like Figure 7 As shown, in some embodiments, the third housing 13 can be simplified to a cover plate that covers the second housing 12, with only the portion for connection to the second housing 12 inserted into the second housing 12.

[0075] In some embodiments, the inner surface of the second housing 12 is provided with a first fastening member 121, and the outer surface of the third housing 13 is provided with a second fastening member 131 that cooperates with the first fastening member 121.

[0076] The second housing 12 and the third housing 13 are connected by a snap-fit ​​mechanism, with the first snap-fit ​​member 121 located on the inner surface of the second housing 12 and the second snap-fit ​​member 131 located on the outer surface of the third housing 13. This internal snap-fit ​​connection method makes the outer surface of the second housing 12 smooth and enhances its visual appeal. However, this internal snap-fit ​​connection requires deformation of the second housing 12 to disengage the first snap-fit ​​member 121 and the second snap-fit ​​member 131, which is difficult to achieve due to the support of the third housing 13. Therefore, this snap-fit ​​connection method makes the connection between the second housing 12 and the third housing 13 tighter and more secure.

[0077] In some embodiments, the bottom surface of the first housing 11 is provided with a first opening 111, and a bottom cover plate 14 is provided at the first opening 111. The bottom cover plate 14 is connected to the second housing 12, and the bottom cover plate 14 abuts against the first housing 11.

[0078] The connection methods between the second housing 12 and the bottom cover plate 14 are (not limited to): snap-fit ​​connection, screw connection, adhesive connection, rivet connection, etc.

[0079] The bottom cover 14 abuts against the first housing 11, providing abutment force for the fitting of the first housing 11 and the second housing 12, preventing the first housing 11 and the second housing 12 from detaching from each other. By fixing the first housing 11 with the bottom cover 14, connection marks can be avoided on the first housing 11, thus improving the overall aesthetics of the portable fan.

[0080] In some embodiments, the first housing 11 covers the corresponding position of the first latching member 121 to limit the deformation space of the first latching member 121.

[0081] The first housing 11 is fitted onto the second housing 12, and the first housing 11 covers the corresponding position of the first buckle 121. The covering of the first housing 11 can limit the deformation space of the first buckle 121, preventing the first buckle 121 from disengaging under external force, making the portable fan more secure and drop-resistant.

[0082] In some embodiments, a third latching member 141 is provided on the bottom cover plate 14, and a slot 124 that cooperates with the third latching member 141 is provided on the second housing 12. The third latching member 141 is latched and connected to the slot 124 and / or the housing edge 122 of the second housing 12.

[0083] A third latching member 141 is provided on the bottom cover plate 14, and a slot 124 is provided on the second housing 12 to cooperate with the third latching member 141. The third latching member 141 is inserted into the slot 124 and connected to the second housing 12. In some embodiments, when the second housing 12 is limited by space and it is inconvenient to provide a slot 124, the third latching member 141 is directly connected to the housing edge 122 of the second housing 12 or the recessed slot 124 in the housing edge 122.

[0084] In some embodiments, the second housing 12 has a second opening 123, which is connected to the first opening 111, and the opening area of ​​the second opening 123 is smaller than the opening area of ​​the first opening 111.

[0085] The area of ​​the first opening 111 is larger than that of the second opening 123, causing the first shell 11 and the second shell 12 to be misaligned on the bottom surface. The misaligned structure of the second shell 12 forms the shell edge 122 that is snapped into place with the third fastener 141. The misalignment between the areas of the first opening 111 and the second opening 123 not only allows the bottom cover plate 14 to be snapped into place with the second shell 12, but also allows the bottom cover plate 14 to naturally form an abutment connection with the first shell 11. This fully utilizes the hierarchical relationship of the spatial structure to achieve the purpose of fixing the first shell 11 and the second shell 12, demonstrating ingenious design.

[0086] In some embodiments, the first fastener 121 is a plurality of claws 121a, and any one of the claws 121a forms a triangular stable structure with its two adjacent claws 121a. The second fastener 131 is a plurality of slots 131a, and any one of the slots 131a forms a triangular stable structure with its two adjacent slots 131a.

[0087] The first fastener 121 includes three claws 121a. However, the number of claws 121a in the first fastener 121 is not limited to this. Depending on the specific application scenario, in some embodiments, the number of claws 121a can be (not limited to): 4, 5, 6 or more.

[0088] The second fastener 131 includes three slots 131a. However, the number of slots 131a in the second fastener 131 is not limited to this. Depending on the specific application scenario, in some embodiments, the number of slots 131a can be (not limited to): 4, 5, 6 or more.

[0089] The claw 121a of the first latching member 121 and the slot 131a of the mating second latching member 131 both form a stable triangular structure, enabling the latching connection between the first housing 11 and the second housing 12. The stability of the triangular structure enhances the connection strength between the first housing 11 and the second housing 12. It can resist not only the pulling force along the vertical direction of the fan housing 1, but also the impact and pulling force along the horizontal direction of the fan housing 1, making the connection between the first housing 11 and the second housing 12 more secure.

[0090] It should be noted that any of the embodiments in this example can be implemented independently or in combination with one or more other embodiments. When implementing in combination, the combination method should not be limited to the combination methods listed in this example.

[0091] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A portable fan with cooling function, characterized in that, include: A fan housing, wherein an air inlet and an air outlet are provided on the fan housing and are arranged opposite to each other; A fan assembly, which is assembled within the fan housing; An expansion space is provided between the air outlet end of the fan blades and the air outlet in the fan assembly. The flow channel area for airflow in the radial section of the inlet end of the expansion space is smaller than the flow channel area for airflow in the radial section of the outlet end of the expansion space.

2. The portable fan with cooling function according to claim 1, characterized in that, The fan assembly is provided with a plurality of first stationary blades inside or on the mounting base connected to the fan assembly, and a plurality of second stationary blades are provided at the air outlet of the fan housing, and the expansion space is provided within the space formed by the plurality of second stationary blades.

3. The portable fan with cooling function according to claim 2, characterized in that, Along the direction from the air inlet to the air outlet, each of the plurality of second stationary blades is provided with a first end and a second end, the width of the first end being smaller than the width of the second end, so as to form the expansion space.

4. The portable fan with cooling function according to claim 2, characterized in that, The expansion space is disposed between the mounting base and the air outlet, and the expansion space is enclosed by the inner wall of the fan housing.

5. The portable fan with cooling function according to claim 2, characterized in that, The expansion space is disposed between the second stationary blade and the air outlet, and the fan housing between the second stationary blade and the air outlet is radially enlarged.

6. The portable fan with cooling function according to claim 2, characterized in that, The fan housing includes a first housing and a second housing, wherein the first housing is fitted onto the second housing, and the air inlet is disposed on the second housing.

7. The portable fan with cooling function according to claim 6, characterized in that, The first housing is made of a transparent or translucent material; and / or, Identification information is provided on the inner surface of the first housing and / or the outer surface of the second housing; and / or, A light strip is provided on the first housing or the second housing.

8. The portable fan with cooling function according to claim 6, characterized in that, The fan housing further includes: a third housing, which is inserted into the second housing, the air outlet is disposed on the third housing, and the plurality of second stationary blades are disposed on the third housing.

9. The portable fan with cooling function according to claim 8, characterized in that, The inner surface of the second housing is provided with a first fastening element, and the outer surface of the third housing is provided with a second fastening element that cooperates with the first fastening element; and / or, The bottom surface of the first housing has a first opening, and a bottom cover plate is provided at the first opening. The bottom cover plate is connected to the second housing, and the bottom cover plate abuts against the first housing.

10. The portable fan with cooling function according to claim 9, characterized in that, The first housing covers the corresponding position of the first fastener to limit the deformation space of the first fastener; And / or, A third fastener is provided on the bottom cover plate, and a slot is provided on the second housing to cooperate with the third fastener. The third fastener is fastened to the slot and / or the edge of the second housing; and / or, The second housing has a second opening, which communicates with the first opening, and the opening area of ​​the second opening is smaller than the opening area of ​​the first opening; And / or, The first fastener consists of multiple claws, with any one claw forming a triangular stable structure with its two adjacent claws. The second fastener consists of multiple slots, with any one slot forming a triangular stable structure with its two adjacent slots.

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