Portable fan

Abstract

The utility model discloses a portable fan. The portable fan comprises a shell; the connecting ring is connected with the shell body; the base is located in the middle of the connecting ring, and the base extends towards the interior of the shell; the fan assembly is connected with the base; one end of any one of the plurality of stationary blades is connected with the connecting ring, the other end of any one of the plurality of stationary blades is connected with the base, and a pressure equalizing notch is formed in the position where any one of the stationary blades is connected with the base. And due to the design of the pressure equalizing notches, airflow blown out of different small air outlets can be circumferentially adjusted near the surface of the base. The pressure equalizing notches can balance the air flow pressure difference between the adjacent stationary blades, so that the air flow which is not uniform in flow speed originally can be redistributed and adjusted. Therefore, the uniformity of the airflow is improved, the airflow in the area in front of the base is more stable, and the airflow turbulence phenomenon caused by the speed difference is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fans, in particular to a portable fan. BACKGROUND

[0002] In the hot summer, fans have become an essential item for people to eliminate the heat. With the increasing demand for convenient use, more and more people prefer lighter and more portable fans.

[0003] In the prior art, common portable fans generally adopt a turbine design, and the core structure includes a turbine impeller, a motor and an air outlet assembly. The air outlet is usually designed as an annular structure, and a plurality of static blades are uniformly distributed inside the air outlet. One end of each static blade is fixed to the center base of the air outlet, and the other end extends outward to the edge of the air outlet. An independent small air outlet is formed between two adjacent static blades.

[0004] The inventor of the present application found in research that due to the complex use environment of the portable fan, the airflow passing through different small air outlets is affected by various factors, such as small differences in the internal structure of the fan, changes in external wind resistance and vibrations during motor operation. These factors can cause differences in airflow velocity from each small air outlet. When different airflow velocities converge in the area in front of the base, turbulent airflow is easily generated, i.e. turbulence. This turbulence not only reduces the actual air supply efficiency of the fan, but also can cause unstable airflow, affecting the user's experience. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the present application is to provide a portable fan that is easy to manufacture and assemble, and improves the preparation efficiency.

[0006] The present application provides a portable fan, comprising:

[0007] a housing;

[0008] a connecting ring connected to the housing;

[0009] a base located in the middle of the connecting ring, and the base extends towards the inside of the housing;

[0010] a fan assembly connected to the base;

[0011] a plurality of static blades, one end of any static blade in the plurality of static blades is connected to the connecting ring, the other end of the any static blade is connected to the base, and a pressure equalizing notch is provided at the position where the any static blade is connected to the base.

[0012] Optionally, the first end of the any vane is curvedly extended by the connecting ring towards the base, and forms the pressure-equalizing gap with the base.

[0013] Optionally, a second end of the any vane opposite to the first end is extended by the base towards the inner surface of the shell, so that the first side of the any vane has a length greater than that of the second side.

[0014] Optionally, the first side is connected with the connecting ring, and the first side extends towards the air inlet of the shell by abutting the inner surface of the shell.

[0015] Optionally, the any vane is curvedly extended from the first end to the second end, and the any vane is curved along a direction from the first end to the second end opposite to a rotation direction of the fan blades of the fan assembly.

[0016] Optionally, the second end has a length greater than that of the first end, and the width of the any vane gradually decreases along a direction from the second end to the first end.

[0017] Optionally, the opening width of the pressure-equalizing gap gradually increases along a direction of air outlet of the fan assembly.

[0018] Optionally, the shell comprises an outer shell and an inner shell, the connecting ring is arranged in the outer shell, one end of the connecting ring abuts against the inner surface of the outer shell, one end of the inner shell is inserted into the outer shell from a first end of the outer shell, the inner shell is snap-connected with the outer shell, the other end of the connecting ring abuts against the inner shell, and the outer shell oppositely clamps the connecting ring and the inner shell.

[0019] Optionally, the outer shell has a first stop ring formed by extending radially towards the inner side, and the outer surface of the connecting ring has a second stop ring formed by protruding and matched with the first stop ring.

[0020] Optionally, one end of the inner shell abuts against the connecting ring, the other end of the inner shell abuts against the end of the outer shell, the outer surface of the inner shell is provided with a first clamping ring, and the inner surface of the outer shell is provided with a plurality of clamping claws matched with the first clamping ring.

[0021] The beneficial effects of the embodiments of the present application are: the design of the pressure-equalizing notch allows the airflow from different small air outlets to be adjusted circumferentially near the base surface. The pressure-equalizing notch can balance the pressure difference of the airflow between adjacent static vanes, allowing the airflow with uneven flow rate to be redistributed and adjusted. This not only improves the uniformity of the airflow, but also makes the airflow in the front area of the base more stable, reducing the airflow turbulence phenomenon caused by speed difference. At the same time, the introduction of the pressure-equalizing notch can guide the airflow to smoothly transition on the base surface, reducing the occurrence of turbulence. This optimized design significantly improves the overall aerodynamic performance of the fan, allowing it to provide more efficient air supply under the same power condition. Finally, by reducing the turbulence scale in front of the base, the design of the pressure-equalizing notch can effectively reduce the noise generated during fan operation. By reducing turbulence and noise, the use effect of the fan is significantly improved, and users can feel more gentle and uniform airflow during use. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0023] Figure 1 The overall structure schematic diagram of a portable fan for one specific embodiment of the present application;

[0024] Figure 2 The first perspective structure schematic diagram of an assembly seat for one specific embodiment of the present application;

[0025] Figure 3 The first perspective structure schematic diagram of an assembly seat for one specific embodiment of the present application; Figure 2 The enlarged schematic diagram of the middle area A;

[0026] Figure 4 The second perspective structure schematic diagram of an assembly seat for one specific embodiment of the present application;

[0027] Figure 5 The second perspective structure schematic diagram of a portable fan for one specific embodiment of the present application;

[0028] Figure 6 The cross-sectional schematic diagram of a portable fan for one specific embodiment of the present application;

[0029] Figure 7 The shell structure schematic diagram for one specific embodiment of the present application.

[0030] BRIEF DESCRIPTION OF DRAWINGS: 1, shell; 11, outer shell; 111, jaw; 112, first stop ring; 12, inner shell; 121, first clamping ring; 13, air inlet; 14, air outlet; 2, connecting ring; 21, second stop ring; 3, base; 31, hollow tube; 4, vane; 41, first end; 42, second end; 43, first side edge; 44, second side edge; 5, fan assembly; 51, fan motor; 52, fan blade; 6, pressure-equalizing notch. DETAILED DESCRIPTION

[0031] For the convenience of understanding the present application, the present application will be described in more detail below in conjunction with the 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 intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "vertical", "horizontal", "left", "right", and similar expressions used in the present specification are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used in the present specification are the same as those commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the present specification includes any and all combinations of one or more related listed items.

[0033] Please refer to Figure 1 and Figure 2 , Figure 1 is the first perspective view of the portable fan of the present embodiment; Figure 2 is the first perspective view of the assembly seat of the present embodiment.

[0034] As Figure 1 and Figure 2 shown, a portable fan includes: a shell 1; a connecting ring 2 connected with the shell 1; a base 3 located in the middle of the connecting ring 2, and the base 3 extends towards the inside of the shell 1; a fan assembly 5 connected with the base 3; a plurality of vanes 4, one end of any vane 4 of the plurality of vanes 4 is connected with the connecting ring 2, the other end of any vane 4 is connected with the base 3, and a pressure-equalizing notch 6 is arranged at the position where any vane 4 is connected with the base 3.

[0035] In the embodiment, the shell 1 comprises an inner shell 12 and an outer shell 11, and the outer shell 11 is sleeved on the inner shell 12. However, the structure of the shell 1 is not limited to this, and according to different specific application scenarios, in some embodiments, the structure of the shell 1 can be (but not limited to) one of the following: one-piece molding, half-shell 1 splicing, three-shell 1 sleeving, and the like.

[0036] The connection between the shell 1 and the connecting ring 2 is an abutting clamping. However, the connection between the two is not limited to this, and according to different specific application scenarios, in some embodiments, the connection between the shell 1 and the connecting ring 2 can be (but not limited to) one of the following: clamping, screwing, riveting, magnetic attraction, adhesive connection, or welding.

[0037] The shell 1 in the embodiment is a cylindrical hollow shell 1, and the air inlet 13 and the air outlet 14 of the shell 1 are oppositely arranged. However, the shape of the shell 1 is not limited to this, and according to different specific application scenarios, in some embodiments, the shape of the shell 1 can be (but not limited to) one of the following: oval, spherical, or prismatic. In some embodiments, a handle is also assembled on the shell 1 for convenient holding. In some embodiments, the portable fan can be used as an independent module, and an expansion interface is arranged on the shell 1 for connecting a corresponding expansion module.

[0038] In the embodiment, the material of the shell 1 is plastic, and the shell 1 made of plastic has the advantages of light weight, wear resistance, and corrosion resistance. However, the material of the shell 1 is not limited to this, and according to different specific application scenarios, in some embodiments, the shell 1 can be made of metal materials, alloy materials, or the like.

[0039] In the embodiment, the fan assembly 5 comprises a fan motor 51 and fan blades 52. The fan motor 51 can be (but not limited to) one of the following: a single-phase motor, a two-phase motor, or a three-phase motor. The fan blades 52 can be axial flow blades or inclined flow blades.

[0040] The connection between the fan assembly 5 and the base 3 is that the hollow tube 31 for connecting the fan assembly 5 is arranged on the base 3.

[0041] In the embodiment, the number of the static blades 4 is 7. However, the number of the static blades 4 is not limited to this, and according to different specific application scenarios, in some embodiments, the number of the static blades 4 can be one of the following: 2, 3, 4, 5, 6, 8, 9, or more.

[0042] In this embodiment, any vane 4 refers to any one of the plurality of vanes 4. However, it should be noted that in some embodiments, one of the plurality of vanes 4 is also used as a wiring structure to provide a container for the lead wire. Due to the need for wiring, the volume of this vane 4 is larger, and some features of the vanes 4 in this embodiment are lost. In this application scenario, the vane 4 for wiring does not belong to any vane 4 in this embodiment.

[0043] The above-mentioned embodiments make the airflow blown from different small air outlets 14 able to achieve circumferential adjustment near the surface of the base 3 through the design of the pressure equalizing gap 6. The pressure equalizing gap 6 can balance the pressure difference of the airflow between adjacent vanes 4, so that the airflow with uneven flow rate can be redistributed and adjusted. This not only improves the uniformity of the airflow, but also makes the airflow in the front area of the base 3 more stable, reducing the airflow turbulence phenomenon caused by the speed difference. At the same time, the introduction of the pressure equalizing gap 6 can guide the airflow to smoothly transition on the surface of the base 3, reducing the occurrence of turbulence. This optimized design significantly improves the overall aerodynamic performance of the fan, enabling it to provide more efficient air supply effect under the same power condition. Finally, by reducing the turbulence scale in the front of the base 3, the design of the pressure equalizing gap 6 can effectively reduce the noise generated during the operation of the fan. By reducing turbulence and noise, the use effect of the fan is significantly improved, and users can feel more gentle and uniform airflow during use.

[0044] Please refer to Figure 4 , the rabbit 4 is the second perspective structure diagram of this embodiment.

[0045] As shown in Figure 4 , in some embodiments, the first end 41 of any vane 4 is bent and extends towards the base 3 from the connecting ring 2, and forms a pressure equalizing gap 6 with the base 3.

[0046] The bent extension design of the first end 41 of the vane 4 forms a circular arc edge on one side of the pressure equalizing gap 6. This circular arc structure can effectively guide the airflow to smoothly transition, avoiding the generation of vortex or resistance when the airflow passes through the pressure equalizing gap 6. The circular arc edge reduces the pressure loss of the airflow when passing through the gap, enabling the airflow to pass through the air outlet 14 area more efficiently, thereby improving the overall air outlet efficiency. The circular arc edge can guide the airflow between adjacent vanes 4 to converge more smoothly, to some extent balancing the airflow speed difference between different air outlets 14, so that the airflow is more evenly distributed in the front area of the base 3, thereby reducing the turbulence phenomenon caused by the airflow speed difference. The bent extension design of the vane 4 optimizes the aerodynamic characteristics of the air outlet 14 area. The circular arc edge can reduce the separation phenomenon of the airflow when passing through the gap, avoiding energy loss caused by airflow separation.

[0047] It should be noted that, according to different specific application scenarios, in some embodiments, the shape of the pressure equalizing notch 6 can be (but not limited to): arc, semicircle, triangle, rectangle or other polygons, etc.

[0048] In some embodiments, the second end 42 of any vane 4 opposite to the first end 41 extends obliquely from the base 3 to the inner surface of the shell 1, so that the length of the first side edge 43 of any vane 4 is greater than the length of the second side edge 44. The first side edge 43 is located on the side of the vane 4 close to the inner surface of the shell 1, and the second side edge 44 is connected to the surface of the base 3.

[0049] The oblique design of the second end 42 makes the length of the first side edge 43 (the side close to the inner surface of the shell 1) longer. Since the airflow in the fan shell 1 presents a spiral rotation when the fan blades rotate, the airflow close to the inner surface of the shell 1 has higher linear velocity, greater energy, and greater transverse kinetic energy. The first side edge 43, being longer, can contact this part of high-energy airflow earlier and provide a longer flow guiding path. This design enables the first side edge 43 to better offset and convert the transverse airflow, thereby enhancing the directional movement ability of the airflow when it is blown out. By optimizing the directionality of the airflow, the fan can provide a more concentrated and powerful air supply effect, improving the user's experience.

[0050] At the same time, after the oblique arrangement of the second end 42, the contact area between the vane 4 and the airflow is small in the initial stage, but gradually increases as the airflow advances along the shell 1. This design is in line with the characteristics that the outer airflow of the spiral airflow has high linear velocity and large energy, while the inner airflow has low linear velocity and small energy. When the airflow just enters the area of the vane 4, the small contact area avoids the generation of large resistance or vortex due to the sudden blocking of the airflow. The small contact area helps to reduce the airflow turbulence in the initial stage, so that the airflow can enter the guiding area more smoothly. Reducing the energy loss in the initial stage makes the airflow more efficiently enter the subsequent flow process. As the airflow advances along the shell 1, the kinetic energy of the outer airflow gradually approaches that of the inner airflow under the guidance of the first side edge 43, at this time, the contact area between the airflow and the vane 4 gradually increases, which can better adapt to the change of the kinetic energy of the airflow. The gradual increase of the contact area helps to more effectively guide and straighten the airflow, reducing the turbulence and energy loss caused by the change of velocity. This design enables the airflow to be properly guided and adjusted at different stages, maintaining the stability of the flow. The oblique arrangement of the second end 42 also effectively reduces the aerodynamic friction noise when the vane 4 contacts the airflow, making the portable fan quieter.

[0051] It should be noted that, according to different specific application scenarios, in some embodiments, the second end 42 can be arranged horizontally, or a wedge-shaped or arc-shaped notch can be arranged at the second end 42.

[0052] In some embodiments, the first side edge 43 is connected to the connecting ring 2, and the first side edge 43 extends along the inner surface of the housing 1 towards the air inlet 13 of the housing 1.

[0053] The design of the first side edge 43 closely adhering to the inner surface of the housing 1 reduces the gap between the stationary blade 4 and the housing 1. This close connection effectively prevents air leakage when the air flow passes through the gap between the stationary blade 4 and the housing 1. The reduction of air leakage means that more air flow can be directed to the air outlet 14 area, thereby improving the overall air guiding efficiency of the fan. As the first side edge 43 closely adheres to the inner surface of the housing 1, the air flow passing through the stationary blade 4 will not produce turbulence or vortex phenomenon due to excessive gap. Turbulence and vortex are one of the main sources of fan noise. By reducing the occurrence of these phenomena, the noise level during fan operation is significantly reduced. The design of the first side edge 43 closely adhering to the inner surface of the housing 1 enhances the structural stability of the stationary blade 4. This design reduces the vibration of the stationary blade 4 caused by air flow impact during high-speed operation.

[0054] In some embodiments, any stationary blade 4 extends from the first end 41 to the second end 42 in a curved manner, and the direction of the curve of any stationary blade 4 from the first end 41 to the second end 42 is opposite to the rotation direction of the fan blades 52 of the fan assembly 5.

[0055] The curved direction of the stationary blade 4 is opposite to the rotation direction of the fan blades 52, and the movement path of the air flow passing through the rotation of the fan blades 52 is also opposite to the curved direction of the stationary blade 4. This allows the air flow to impact the stationary blade 4 at a larger angle when it contacts the stationary blade 4, and this larger contact angle helps to more effectively guide the air flow along the surface of the stationary blade 4. The reverse curve design makes the air flow smoother when it contacts the stationary blade 4, reducing turbulence and vortex phenomena caused by rapid changes in the direction of the air flow. By reducing the occurrence of these phenomena, the noise level during fan operation is significantly reduced.

[0056] In some embodiments, the length of the second end 42 is greater than the length of the first end 41, and the width of any stationary blade 4 gradually decreases in the direction from the second end 42 to the first end 41. The gradual decrease in the width of the stationary blade 4 in the direction of the air flow also means that the distance between the base 3 and the housing 1 is gradually decreasing, thereby making the air duct narrower and narrower for the air flow to flow.

[0057] The design that the width of the stationary blade 4 gradually decreases from the second end portion 42 to the first end portion 41 makes the air flow gradually compressed when passing through the stationary blade 4. According to Bernoulli's principle, the increase of air flow speed will cause the pressure to decrease, and the gradually decreasing width design can force the air flow to accelerate, so that the speed and energy of the air flow at the air outlet 14 are significantly improved, thereby enhancing the wind pressure and air supply capacity of the fan. At the same time, the gradual change of the width of the stationary blade 4 makes the air flow more smoothly when passing through the blade, the wider part helps to collect and straighten the air flow, and the gradually narrowing part helps to concentrate the air flow, reduces the energy loss caused by the sudden change of the path, so that the air flow is more efficient during the flow process, reduces the energy loss caused by vortex or turbulence, and further improves the overall efficiency of the fan.

[0058] It should be pointed out that, according to different specific application scenarios, in some embodiments, the length of the first end portion 41 is equal to the length of the second end portion 42, or the length of the first end portion 41 is greater than the length of the second width.

[0059] As shown in Figure 3 , in some embodiments, the opening width of the pressure equalizing gap 6 gradually increases along the air outlet direction of the fan assembly 5. The air flow blown out from the air outlet 14 gradually decreases in flow speed along the air outlet direction, and the wind pressure gradually increases. In cooperation with this change process, the area of the pressure equalizing gap 6 also gradually increases, so that the pressure at the position of the pressure equalizing gap 6 is balanced before and after, the pressure distribution of the air flow is adjusted, the pressure difference of the air flow between adjacent stationary blades 4 is balanced, and the air flow turbulence caused by the speed difference is reduced.

[0060] Please refer to Figure 5 and Figure 6 , Figure 5 is a second perspective view of the portable fan of the embodiment; Figure 6 is a cross-sectional view of the portable fan of the embodiment.

[0061] As shown in Figure 5 and Figure 6 , in some embodiments, the shell 1 comprises an outer shell 11 and an inner shell 12, the connecting ring 2 is arranged in the outer shell 11, one end of the connecting ring 2 and the inner surface of the outer shell 11 abut each other, one end of the inner shell 12 is inserted into the outer shell 11 from the first end of the outer shell 11, the inner shell 12 and the outer shell 11 are snap connected, the other end of the connecting ring 2 and the inner shell 12 abut each other, and the outer shell 11 forms a clamping in opposite directions to the connecting ring 2 and the inner shell 12.

[0062] The "butt joint + buckle" dual-effect assembly system is adopted: the inner shell 12 is quickly positioned and locked with the outer shell 11 through buckling, and the connecting ring 2 is physically limited with the outer shell 11 through butt joint, and the two cooperates to form three-dimensional space constraint. This assembly method breaks through the traditional screw fixing or gluing process, reduces the overall assembly process by more than 60%, and ordinary workers can complete the core structure assembly within 30 seconds after simple training, which significantly improves the production line efficiency. At the same time, the characteristics of the thread-free structure can also avoid the problem of thread sliding caused by long-term use. In the innovative design of the triangular stable architecture, the outer shell 11 serves as a rigid constraint layer, and through the inner wall, it applies bidirectional clamping force to the connecting ring 2 and the inner shell 12, forming a mechanical interlocking effect similar to the building mortise and tenon. Through vibration test (frequency 20-200Hz), the displacement between components is reduced to below 0.12mm, effectively suppressing the resonance phenomenon.

[0063] Please refer to Figure 7 , Figure 7 for the schematic diagram of the shell structure of the present embodiment.

[0064] As shown in Figure 7 , in some embodiments, the outer shell 11 extends radially inward at one end to form a first stop ring 112, and the outer surface of the connecting ring 2 is protruded to form a second stop ring 21 matched with the first stop ring 112.

[0065] The matching design of the first stop ring 112 and the second stop ring 21 can accurately limit the position of the connecting ring 2 in the outer shell 11, preventing the connecting ring 2 from shifting or loosening during use. This limiting effect ensures the stability and reliability of the fan assembly 5. Since the connection between the connecting ring 2 and the outer shell 11 is more stable, the vibration energy generated during fan operation is effectively absorbed and dispersed, thereby significantly reducing the noise level.

[0066] In some embodiments, the inner shell 12 is in butt joint with the connecting ring 2 at one end, and the other end of the inner shell 12 is in butt joint with the end of the outer shell 11, and the outer surface of the inner shell 12 is provided with a first clamping ring 121, and the inner surface of the outer shell 11 is protruded to be provided with a plurality of clamping claws 111 matched with the first clamping ring 121. The two ends of the inner shell 12 are respectively in butt joint with the assembly seat and the end of the outer shell 11, avoiding the need for additional fixing parts in the traditional connection method, thereby simplifying the structure and saving space. The matching design of the first clamping ring 121 and the plurality of clamping claws 111 provides reliable locking effect, effectively preventing loosening caused by vibration or impact, and improving the stability of the overall structure.

[0067] It should be noted that any of the embodiments in the present embodiment can be independently implemented, or implemented in combination with one or more other embodiments. When combined, the combination manner should not be limited to the combination manner listed in the present embodiment.

[0068] It should be noted that the preferred embodiments of the present application are described in the specification and the drawings of this patent application and are shown in the drawings; however, it is not intended to limit the present application to the embodiments described in the specification and drawings of this patent application, and it is instead intended that the present application cover all alternatives consistent with the scope of the present application, and it is therefore intended that the present application cover the variations and modifications as set forth in the claims below and their equivalents.

Claims

1. A portable fan characterized by, The utility model relates to a fan structure, including: A shell; A connecting ring connected with the shell; A base located in the middle of the connecting ring and extending towards the inside of the shell; A fan assembly connected with the base; A plurality of static blades, one end of any static blade of the plurality of static blades being connected with the connecting ring, the other end of the any static blade being connected with the base, and the position where the any static blade is connected with the base being provided with an equal-pressure notch.

2. The portable fan of claim 1, wherein, The first end of the any static blade is bent and extends towards the base from the connecting ring, and the equal-pressure notch is formed between the first end and the base.

3. The portable fan of claim 2, wherein, The second end of the any static blade opposite to the first end is inclined and extends towards the inner surface of the shell from the base, so that the length of the first side edge of the any static blade is greater than the length of the second side edge.

4. The portable fan of claim 3, wherein, The first side edge is connected with the connecting ring, and the first side edge extends towards the air inlet of the shell in abutment with the inner surface of the shell.

5. The portable fan of claim 3, wherein, The any static blade is bent and extends from the first end to the second end, and the direction in which the any static blade is bent from the first end to the second end is opposite to the rotation direction of the fan blades of the fan assembly.

6. The portable fan of claim 3, wherein, The length of the second end is greater than the length of the first end, and the width of the any static blade gradually decreases in the direction from the second end to the first end.

7. The portable fan of claim 1, wherein, The opening width of the equal-pressure notch gradually increases in the air outlet direction of the fan assembly.

8. The portable fan of claim 1, wherein, The shell includes an outer shell and an inner shell, the connecting ring is arranged in the outer shell, one end of the connecting ring abuts against the inner surface of the outer shell, one end of the inner shell is inserted into the outer shell from the first end of the outer shell, the inner shell is snap-connected with the outer shell, the other end of the connecting ring abuts against the inner shell, and the outer shell forms opposite clamping on the connecting ring and the inner shell.

9. The portable fan of claim 8, wherein, One end of the outer shell extends radially inward to form a first stop ring, and the outer surface of the connecting ring is protruded to form a second stop ring matched with the first stop ring.

10. The portable fan of claim 8, wherein, One end of the inner shell abuts against the connecting ring, the other end of the inner shell abuts against the end of one end of the outer shell, the outer surface of the inner shell is provided with a first clamping ring, and the inner surface of the outer shell is protruded to be provided with a plurality of clamping claws matched with the first clamping ring.

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