A fan body and a portable fan thereof

Abstract

The utility model relates to fan technical field more specifically, relate to a fan main body and its portable fan, wherein the fan main body includes fan head, the fan head includes shell, air inlet casing, air outlet casing and the fan assembly arranged in the shell, the air outlet casing is located at the air outlet end of shell, and the air inlet casing is located at the air inlet end of shell, is equipped with filter piece in the air inlet casing, the fan assembly includes fan blade and is used for driving the motor assembly of fan blade rotation, and the motor assembly is installed to the side of air outlet casing towards the air inlet end of shell, and the fan blade is connected on the output shaft of motor assembly, and the fan blade includes hub and a plurality of blades, and a plurality of blades are fixedly arranged on the outer side wall of hub along the circumferential direction of hub even, and the hub is conical cover body structure, and at least part motor assembly is located in the inner side of hub includes. The filter piece arranged in the air inlet casing of the utility model can carry out filtering treatment to the air that enters into the air inlet casing, can effectively avoid the harm of dust or particulate matter to the user.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and more specifically, to a fan body and its portable fan. Background Technology

[0002] Portable fans, which are easy to carry around, are small and lightweight, meeting the need for portability to a certain extent. However, most portable fans on the market lack air filtration devices, which is particularly detrimental to the respiratory health of infants and young children, especially when used in strollers. Even if some fans have filters, the added resistance to airflow reduces suction efficiency, significantly impacting the air volume and distance, thus affecting the user experience. Utility Model Content

[0003] One objective of this utility model is to provide a fan body with a filter and a large air volume, and another objective of this utility model is to provide a portable fan.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a fan body, including a fan head, the fan head including a shell, an air inlet shell, an air outlet shell, and a fan assembly disposed within the shell. The shell is a cylindrical structure with openings at both ends, the two ends of the shell being the air inlet end and the air outlet end, respectively. The air outlet shell is disposed at the air outlet end of the shell and has an air outlet channel. The air inlet shell is disposed at the air inlet end of the shell and has an air inlet channel. A filter element is disposed inside the air inlet shell. The fan assembly includes fan blades and a motor assembly for driving the fan blades to rotate. The motor assembly is installed on the side of the air outlet shell facing the air inlet end of the shell. The fan blades are connected to the output shaft of the motor assembly. The fan blades include a hub and several blades. The several blades are evenly fixedly disposed on the outer side wall of the hub along the circumference of the hub. The hub has a conical cover structure, and at least part of the motor assembly is located inside the hub.

[0005] Furthermore, the air inlet housing is configured as a cylindrical structure with one end open, and a plurality of air inlet holes are arranged on the side wall of the air inlet housing, forming an air inlet channel of the air inlet housing, and the filter element is coaxially disposed inside the air inlet housing.

[0006] Furthermore, the hub is truncated cone-shaped and has a cover structure with one end open and the other end sealed. The open end of the hub is a flared end and is positioned towards the air outlet end of the outer casing. The sealed end of the hub is a cone tip and is positioned towards the air inlet end of the outer casing. The radial diameter D1 of the cone tip of the hub is 0.08 to 0.32 times the radial diameter D2 of the flared end of the hub.

[0007] Furthermore, the hub includes an air guide section and a blade connecting section connected along the axial direction of the hub. The air guide section is arranged facing the air inlet end of the outer casing. Several blades are evenly fixed on the outer side wall of the blade connecting section along the circumferential distance. The axial length L1 of the air guide section is 1 / 10 to 3 / 10 of the axial length L0 of the entire hub.

[0008] Furthermore, several blades extend from the air inlet end of the housing to the air outlet end of the housing and bend at a preset angle along the circumference of the hub. The side portion of the blade facing the air inlet end of the housing is turned outward in the opposite direction to the circumference of the blade extending along the hub.

[0009] Furthermore, the end-to-end distance D4 between two adjacent blades near the air outlet end of the casing is 4.0-6.3 times the end-to-end distance D3 between two adjacent blades near the air inlet end of the casing.

[0010] Furthermore, the air outlet housing includes a first outer cylinder, a first inner cylinder, and a plurality of first connecting plates. The first outer cylinder is connected to the air outlet end of the outer casing, and the first inner cylinder is located inside the first outer cylinder. The plurality of first connecting plates are spaced apart along the circumference of the first outer cylinder and the first inner cylinder, and the air outlet channel is formed between two adjacent first connecting plates. The axial distance D5 between the end of the first inner cylinder facing the air inlet end of the outer casing and the end of the hub facing the air outlet end of the outer casing is 0.5mm-3mm.

[0011] Furthermore, the fan head also includes a base, on which the fan head is mounted. The base is hollow and contains a rechargeable battery pack for powering the fan body and a charging board electrically connected to the battery pack. The side wall of the base also has a charging interface and a protection switch for controlling the power supply circuit of the fan body. Both the charging interface and the protection switch are electrically connected to the charging board. When the protection switch is in the closed state, the fan body cannot start working.

[0012] A portable fan includes the fan body described above, and also includes a fixing structure for fixing the fan body to other objects for use.

[0013] Furthermore, the fixing structure is detachably connected to the base via a press-fit buckle structure, wherein the fixing structure is a claw structure, a torsion spring press-fit structure, an octopus-like wrapping fixing structure, or a belt buckle fixing structure.

[0014] Compared with the prior art, the beneficial effects of this utility model are: The air inlet of this utility model is provided with an air inlet housing, and a filter is provided inside the air inlet housing. The filter can filter the air entering the air inlet housing, ensuring the cleanliness of the air output and effectively avoiding the harm of dust or particulate matter to the user. Especially when used in strollers, it can effectively protect the respiratory tract and physical health of infants and young children. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of the fan body in Embodiment 1 of this utility model; Figure 2 This is a cross-sectional view of the fan head in Embodiment 1 of this utility model (the arrows in the figure indicate the direction of airflow). Figure 3 This is a cross-sectional view of the assembly of the fan assembly and the air outlet housing in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the assembly ring structure in Embodiment 1 of this utility model; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the air inlet housing and filter element in Embodiment 1 of this utility model; Figure 7 for Figure 6 Enlarged view of point B in the middle; Figure 8 This is a schematic diagram of the fan body in Embodiment 2 of this utility model; Figure 9 This is a cross-sectional view of the fan head in Embodiment 2 of this utility model (the arrows in the figure indicate the direction of airflow). Figure 10 for Figure 9 Enlarged view of point C in the middle; Figure 11 for Figure 9 Enlarged view at point D; Figure 12 This is a cross-sectional view of the assembly of the fan assembly, air outlet housing, connecting housing and assembly ring in Embodiment 2 of this utility model; Figure 13 This is a schematic diagram of the fan blade structure in Embodiment 2 of this utility model; Figure 14 This is a side view of the fan blade in Embodiment 2 of this utility model; Figure 15 This is an exploded view of the fan head in Embodiment 2 of this utility model; Figure 16This is a schematic diagram of the gripper structure in Embodiment 3 of this utility model; Figure 17 This is a schematic diagram of the gripper structure from another angle in Embodiment 3 of this utility model; Figure 18 This is a partial structural diagram of the gripper structure in Embodiment 3 of this utility model; Figure 19 This is a schematic diagram of the cover portion of the gripper structure in Embodiment 3 of this utility model; Figure 20 for Figure 19 Sectional view at point AA; Figure 21 This is a schematic diagram of the press-fit buckle structure in Embodiment 3 of this utility model. Detailed Implementation

[0016] 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.

[0017] 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. Example 1

[0018] This embodiment is Embodiment 1 of a fan body with air filtration function, including a fan head 3, as shown. Figures 1-7 As shown, in this embodiment, the fan head 3 includes a housing 31, a fan assembly 32, an air inlet housing 33, and an air outlet housing 34. The housing 31 is a cylindrical housing open at both ends, with an air inlet A and an air outlet B at the two ends. External air enters the housing 31 from the air inlet A and exits from the air outlet B. The fan assembly 32 is located inside the housing 31. The air inlet housing 33 is located at the air inlet end of the housing 31 and has an air inlet channel. The air outlet housing 34 is located at the air outlet end of the housing 31 and has an air outlet channel.

[0019] like Figure 2 As shown, in this embodiment, the fan head 3 also includes a connecting housing 37, which is fixedly disposed inside the outer casing 31. In this embodiment, the air inlet housing 33 is detachably connected to the end of the connecting housing 37 facing the air inlet end of the outer casing. Specifically, as shown... Figure 2 and Figure 4 As shown, in this embodiment, an assembly ring 39 is connected to the side of the connecting housing 37 facing the air inlet end of the outer casing 31, and the assembly ring 39 is connected to the air inlet end of the outer casing 31. As a preferred technical solution, the connection method between the assembly ring 39 and the air inlet end of the outer casing 31 can be a screw connection, a snap-fit ​​connection, or a plug-in connection, etc. These connection methods are merely examples and not restrictive provisions. Furthermore, in this embodiment, the assembly ring 39 is located inside the outer casing 31, that is, the end of the assembly ring 39 does not extend outward beyond the end of the outer casing 31. In this embodiment, the end of the assembly ring does not extend outward beyond the end of the outer casing, and the air inlet housing is detachably connected to the assembly ring 39.

[0020] In this embodiment, the air inlet housing 33 is detachably connected to the assembly ring 39. For example... Figure 2 and Figure 6 As shown, in this embodiment, the air inlet housing 33 is configured as a cylindrical structure with one open end. In this embodiment, the diameter of the open end of the air inlet housing 33 is slightly larger than the diameter of the closed end of the air inlet housing 33. Figure 2 and Figure 4 As shown, in this embodiment, the assembly ring 39 has an assembly recess 392 on the side facing the air inlet housing 33. The open end of the air inlet housing 33 can be inserted into the assembly recess 392 of the assembly ring 39, which facilitates accurate positioning of the air inlet housing 33 during assembly and helps to improve the installation efficiency of the air inlet housing 33.

[0021] like Figures 4-7 As shown, in this embodiment, the air inlet housing 33 and the assembly ring 39 are detachably connected via a snap-fit ​​structure 5. Specifically, as... Figures 4-7 As shown, in this embodiment, the snap-fit ​​structure 5 includes a snap-fit ​​groove 51 and a snap-fit ​​block 52. In this embodiment, the snap-fit ​​block 52 is disposed on the assembly ring 39. In this embodiment, the snap-fit ​​block 52 has an "L"-shaped block structure. Specifically, the snap-fit ​​block 52 includes a first block 521 and a second block 522 connected to each other. The first block 521 is disposed on the assembly ring 39 along the axis of the assembly ring 39, and the second block 522 is disposed on the assembly ring 39 along the circumference of the assembly ring 39.

[0022] The snap-fit ​​groove 51 is located on the outer wall of the open end of the air inlet housing 33, and the shape of the snap-fit ​​groove 51 matches the shape of the snap-fit ​​block 52. When the air inlet housing 33 is inserted into the mounting recess 392 on the mounting ring 39, rotating the air inlet housing 33 will cause the snap-fit ​​block 52 on the mounting ring 39 to snap into the snap-fit ​​groove 51 of the air inlet housing 33. At this time, the air inlet housing 33 is axially limited on the mounting ring 39, and the air inlet housing 33 can be installed on the mounting ring 39. When it is necessary to remove the air inlet housing 33 from the mounting ring 39, simply rotate the air inlet housing 33 in the opposite direction to disengage the snap-fit ​​block 52 from the snap-fit ​​groove 51, and the air inlet housing 33 can be removed from the mounting ring 39.

[0023] As a preferred technical solution, in this embodiment, the second block 522 of the snap-fit ​​block 52 is provided with a positioning recess 523, and the snap-fit ​​groove 51 is provided with a positioning protrusion 511. When the snap-fit ​​block 52 is snapped into the snap-fit ​​groove 51, the positioning protrusion 511 on the snap-fit ​​groove 51 is limited to the positioning recess 523 on the second block 522. The positioning protrusion 511 and the positioning recess 523 can achieve a self-locking position of the snap-fit ​​block 52, thereby allowing the air inlet housing 33 to be more securely assembled onto the assembly ring 39. In addition, the positioning protrusion 511 and the positioning recess 523 can also serve as a prompt, that is, when the positioning protrusion 511 is snapped into the positioning recess 523, there will be a certain sense of locking, which can prompt the user that the air inlet housing 33 has been installed. In this embodiment, the air inlet housing 33 can be detachably connected to the air inlet end of the outer shell 31 by the assembly ring 39 and the snap-fit ​​structure 5, which makes the air inlet housing 33 easy to disassemble and assemble, and facilitates the cleaning of the air inlet housing 33 and the maintenance and replacement of internal parts.

[0024] like Figure 2 and Figure 6 As shown. To improve the cleanliness of the exhaust air, a filter element 4 is also provided inside the air inlet housing 33 in this embodiment. In this embodiment, the filter element 4 is configured as a cylindrical structure. Specifically, in this embodiment, the filter element 4 can be a HEPA filter cartridge. The filter element 4 can filter and clean the air entering the housing 31, effectively preventing dust or particulate matter from harming the user. As a preferred technical solution, in this embodiment, the filter element 4 is coaxially arranged inside the air inlet housing 33. Figure 2 and Figure 6 As shown, in this embodiment, a plurality of air inlet holes 331 are arranged on the side wall of the air inlet housing 33, which serve as air inlet channels for the air inlet housing 33. The air inlet holes 331 are oriented towards the filter element 4, ensuring that the air entering the air inlet housing 33 first contacts and is filtered by the filter element 4 before entering the housing 31. As a preferred embodiment, the side wall of the air inlet housing 33 is circular and bulges outwards, which increases the air inlet area.

[0025] As a preferred technical solution, such as Figure 6 As shown, in this embodiment, a plurality of protruding ridges 332 are evenly spaced along the circumference of the inner sidewall of the air inlet housing 33. The protruding ridges 332 can support the filter element 4, so that the filter element 4 can be stably located inside the air inlet housing 33. At the same time, the protruding ridges 332 make a certain gap between the sidewall of the air inlet housing 33 and the filter element 4. This arrangement can effectively prevent the filter element 4 from being tightly attached to the air inlet hole 331. On the one hand, it can reduce wind resistance and ensure air intake; on the other hand, it can make the air enter the air inlet housing 33 first and then come into contact with the filter element 4 for filtration, ensuring the effective contact area between the air and the filter element 4, which is beneficial to improving filtration efficiency.

[0026] When the air inlet housing 33 is installed on the assembly ring 39, the filter element 4 is axially confined between the assembly ring 39 and the air inlet housing 33, that is, one end of the filter element 4 abuts against the assembly ring 39, and the other end abuts against the inner bottom of the air inlet housing 33. After the air inlet housing 33 is removed from the assembly ring 39, the filter element 4 can be directly removed from the air inlet housing 33, which facilitates the replacement or cleaning of the filter element 4. In this embodiment, the filter element 4 can filter the air entering the air inlet housing 33, which helps to improve the cleanliness of the exhaust air and can effectively reduce the harm of dust or particulate matter to the user.

[0027] In this embodiment, a filter element 4 is provided inside the air inlet housing 33. At the same time, in this embodiment, the air outlet housing 34, the connecting housing 37 and the fan assembly 32 cooperate to form a pressurization channel with a gradually decreasing radial cross-sectional area from the air inlet end to the air outlet end of the outer shell 31. The pressurization channel can effectively increase the air delivery distance and air volume, and can also improve the air intake suction of the fan head 3. Thus, even with the filter element 4 installed, the fan head 3 can still ensure sufficient air intake without affecting the user's experience.

[0028] like Figure 2 As shown, in this embodiment, the fan assembly 32 is disposed within the connecting housing 37 and mounted on the air outlet housing 34. Specifically, the fan assembly 32 includes a motor assembly 321 and fan blades 36. The motor assembly 321 is mounted on the side of the air outlet housing 34 facing the air inlet end of the outer housing 31. The motor assembly 321 drives the fan blades 36 to rotate, and the fan blades 36 are connected to the output shaft of the motor assembly 321. Specifically, as... Figure 2 and Figure 3As shown, in this embodiment, the fan blade 36 includes an assembly cylinder 361, a hub 362, and several blades 363. The hub 362 has a conical cover structure; specifically, in this embodiment, the hub 362 is a truncated cone shape, with one end open and the other sealed. The sealed end of the hub 362 is the cone tip 3621, which faces the air inlet end of the outer casing 31. The open end of the hub 362 is a flared end 3622, which faces the air outlet end of the outer casing 31. The radial cross-sectional area of ​​the hub 362 gradually increases from the air inlet end of the outer casing 31 towards the air outlet end. Specifically, in this embodiment, the hub 362 includes a guide surface 3623 that radially increases from the air inlet end of the outer casing 31 towards the air outlet end. As a preferred technical solution, in this embodiment, at least a portion of the guide surface 3623 is radially concave inward to form a concave surface.

[0029] The assembly cylinder 361 is located at the flared end 3622 of the hub 362, and at least partially inside the hub 362. Specifically, one end of the assembly cylinder 361 is fixedly connected to the inner wall of the hub 362, and the other end of the assembly cylinder 361 extends forward beyond the flared end 3622 of the hub 362. A portion of the motor assembly 321 is located inside the assembly cylinder 361. As a preferred technical solution, in this embodiment, the motor assembly 321 adopts an external rotor brushless motor, a three-phase high-speed micro motor, or other suitable motors, which are selected and adapted according to the specific requirements.

[0030] like Figure 3 As shown, in this embodiment, a first mounting sleeve 364 is provided inside the hub 362. Specifically, one end of the first mounting sleeve 364 is fixedly connected to the interior of the conical top end 3621 of the hub 362, and the other end of the first mounting sleeve 364 is connected to the output shaft of the motor assembly 321. The motor assembly 321 can drive the entire fan blade 36 to rotate through the first mounting sleeve 364. As a preferred technical solution, in this embodiment, a plurality of reinforcing plates 365 are provided between the outer wall of the first mounting sleeve 364 and the inner wall of the hub 362. The plurality of reinforcing plates 365 are arranged at intervals along the circumference of the first mounting sleeve 364 between the hub 362 and the first mounting sleeve 364. In this embodiment, the setting of the reinforcing plates 365 can improve the stability of the first mounting sleeve 364 inside the hub 362, thereby improving the stability of the rotation of the entire fan blade 36.

[0031] like Figure 2 and Figure 3As shown, in this embodiment, several blades 363 are evenly spaced and fixed on the outer wall of the hub 362 along the circumference of the hub 362. As a preferred technical solution, in this embodiment, several blades 363 extend from the air inlet end of the outer casing 31 to the air outlet end and bend at a preset angle along the circumference of the hub 362. The distance between the ends of two adjacent blades 363 near the air inlet end of the outer casing 31 is smaller than the distance between the ends of two adjacent blades 363 near the air outlet end of the outer casing 31, which is beneficial to improve the smoothness of gas flow, increase the air intake volume, and reduce noise.

[0032] like Figure 3 As shown, in this embodiment, the hub 362 includes an air guide portion 3624 and a blade connecting portion 3625 along the axial direction of the hub 362. In this embodiment, the air guide portion 3624 and the blade connecting portion 3625 are integrally formed. The air guide portion 3624 is arranged facing the air inlet end of the outer casing 31. A plurality of blades 363 are evenly fixedly arranged on the outer side wall of the blade connecting portion 3625 along the circumference of the hub 362. The arrangement of the air guide portion 3624 can play a good air guiding role, which can make the air smoothly transition to the blades, which is conducive to increasing the air intake volume. At the same time, it ensures that the blades have sufficient length on the hub, so that the blades can fully comb the airflow and ensure the air delivery performance of the fan blades.

[0033] like Figure 2 As shown, in this embodiment, the connecting housing 37 includes a second outer cylinder portion 371 and a second inner cylinder portion 372. In this embodiment, the second outer cylinder portion 371 is a cylindrical structure, that is, the second outer cylinder portion 371 is a cylindrical structure with a uniform diameter. The second inner cylinder portion 372 is located inside the second outer cylinder portion 371 and is disposed towards the hub 362. In this embodiment, a plurality of second connecting plates 373 are provided between the second outer cylinder portion 371 and the second inner cylinder portion 372. The plurality of second connecting plates 373 are arranged at intervals along the circumference of the second outer cylinder portion 371 between the second inner cylinder portion 372 and the second outer cylinder portion 371.

[0034] As a preferred technical solution, in this embodiment, the assembly ring 39 is detachably connected to the second connecting plate 373. Specifically, in this embodiment, the assembly ring 39 is connected to the second connecting plate 373 by screws or rivets, such as... Figure 4 As shown, the assembly ring 39 is provided with a plurality of assembly holes 391 for fasteners such as screws or rivets to pass through. It should be noted that the fastening method of the screws or rivets is a preferred method to achieve a detachable connection between the assembly ring 39 and the connecting housing 37, and is not intended to limit the present invention.

[0035] like Figure 2As shown, in this embodiment, the second inner cylinder portion 372 includes a variable diameter section 3721 and a constant diameter section 3722. One end of the variable diameter section 3721 is fixedly connected to the end of the second outer cylinder portion 371 near the air outlet end of the outer casing 31, and the other end of the variable diameter section 3721 is connected to the constant diameter section 3722. The radial cross-sectional area of ​​the variable diameter section 3722 gradually increases from the air inlet end of the outer casing 31 to the air outlet end of the outer casing 31. Specifically, the variable diameter section 3722 includes an inner surface 3724 that increases radially from the air inlet end of the outer casing 31 to the air outlet end of the outer casing 31. As a preferred technical solution, in this embodiment, the second outer cylinder portion 371, the variable diameter section 3721, the constant diameter section 3722, and the second connecting plate 373 are integrally formed.

[0036] like Figure 2 As shown, the fan blade 36 and the variable diameter section 3721 form a flow guiding channel. The air guiding surface 3621 of the hub 36 and the inner side surface 3724 of the variable diameter section 3721 make the cross-sectional area of ​​the flow guiding channel gradually decrease along the direction from the air inlet end of the outer casing 31 to the air outlet end of the outer casing 31. This not only plays a role in obliquely guiding the air, but also has a pressurizing effect on the air, which is conducive to increasing the air delivery distance and enhancing the air intake suction.

[0037] like Figure 2 As shown, in this embodiment, the air outlet housing 34 is disposed on the side of the connecting housing 37 facing the air outlet end of the outer casing 31. Specifically, in this embodiment, the air outlet housing 34 includes a first outer cylinder portion 341 and a first inner cylinder portion 342. In this embodiment, the first outer cylinder portion 341 is a cylindrical tube, and the inner sidewall of the first outer cylinder portion 341 is at least partially of equal diameter. One end of the first outer cylinder portion 341 is fixedly connected to the air outlet end of the outer casing 31. As a preferred technical solution, the connection between the first outer cylinder portion 341 and the air outlet end of the outer casing 31 can be achieved by screw connection, snap-fit, or plug-in connection. The other end of the first outer cylinder portion 341 is tightly abutted or snap-fitted to the end of the second outer cylinder portion 371 facing the air outlet end of the outer casing 31.

[0038] like Figure 2 and Figure 3 As shown, a plurality of first connecting plates 343 are fixedly provided between the first outer cylinder portion 341 and the first inner cylinder portion 342. The plurality of first connecting plates 343 are evenly arranged at intervals along the circumference of the first outer cylinder portion 341 or the first inner cylinder portion 342 between the first outer cylinder portion 341 and the first inner cylinder portion 342, and an air outlet channel 344 of the air outlet housing 34 is formed between two adjacent first connecting plates 343.

[0039] like Figure 2 and Figure 3As shown, the first inner cylinder 342 is a frustum-shaped cylinder. Specifically, in this embodiment, the radial cross-sectional area of ​​the first inner cylinder 342 gradually increases from the air inlet end of the outer casing 31 to the air outlet end of the outer casing 31. The first inner cylinder 342 includes a pressure surface 3421 that increases radially from the air inlet end of the outer casing 31 to the air outlet end of the outer casing 31. As a preferred technical solution, in this embodiment, at least a portion of the pressure surface 3421 protrudes radially outward to form a convex surface. In this embodiment, the inner wall surface of the first outer cylinder 341 and the pressure surface 3421 of the first inner cylinder 342 cause the cross-sectional area of ​​the air outlet channel 344 to gradually decrease from the air inlet end of the outer casing 31 to the air outlet end of the outer casing 31, which can provide secondary pressurization of the air, further increasing the air delivery distance and enhancing the air intake suction.

[0040] In this embodiment, the guide channel formed by the fan blade 36 and the second inner cylinder 372, together with the air outlet channel 344 formed by the first outer cylinder 341, the first inner cylinder 342, and the first connecting plate 343, together form the pressurization channel within the fan head 3. In this embodiment, the guide channel smoothly transitions to the air outlet channel. The pressurization channel in this embodiment allows the fluid to flow obliquely outwards and can pressurize the fluid step by step, which is beneficial to increasing the air volume, air delivery distance, and air intake suction. This allows the fan head 3 in this embodiment to still have a large air intake even with the filter element 4 installed, which can meet the user's usage experience.

[0041] Figure 2 and Figure 3 As shown, in this embodiment, a mounting partition 345 is provided inside the first inner cylinder 342, and the mounting partition 345 is arranged radially inside the first inner cylinder 342. In this embodiment, a second mounting sleeve 346 is provided at the center position of the side of the mounting partition 345 facing the air inlet end of the outer casing 31, and the motor assembly 321 is fixedly assembled on the second mounting sleeve 346.

[0042] like Figure 3 As shown, in this embodiment, the axial distance D5 between the flared end 3622 of the hub 362 and the end of the first inner cylinder 342 facing the air inlet end of the outer casing 31 is between 0.5mm and 3mm. This axial distance D5 not only ensures that the fan blade 36 has room to rotate, i.e., it does not restrict or hinder the normal rotation of the fan blade 36, but also allows the airflow generated by the fan blade 36 to flow smoothly to the air outlet casing 34, which helps reduce noise generated by turbulence.

[0043] As a preferred technical solution, in this embodiment, a shock-absorbing component can also be provided between the assembly cylinder 361 and the motor assembly 321. The shock-absorbing component is a rubber washer. By setting the shock-absorbing component, the stability of the fit between the structures can be improved, and noise can also be reduced, thereby improving the user experience.

[0044] In this embodiment, a cover 348 is provided at the end of the first inner cylinder 342 near the air outlet end of the outer casing 31. Alternatively, the cover 348 can be replaced with a display screen to show information such as fan power or wind speed, further improving the user experience. As a preferred embodiment, the cover 348 is a cover structure, fixedly or detachably mounted on the end of the first inner cylinder 342 facing the air outlet end of the outer casing 31. In this embodiment, the front surface 3481 of the cover 348 is set as a plane.

[0045] like Figure 1 As shown, in this embodiment, the fan body also includes a base 2 and an electronic control component. The fan head 3 is mounted on the base 2. In this embodiment, the base 2 has a hollow structure, and the electronic control component is located inside the base 2. The electronic control component includes components such as a rechargeable battery pack, a charging board, and a control circuit board. The electronic control component is electrically connected to the fan assembly and is used to drive and control the operation of the fan assembly. A charging interface 71 and a control button 72 are also provided on the side wall of the base 2 near the air outlet end of the outer shell 31. The control button 72 is electrically connected to the electronic control component and is used to control the start / stop and wind speed adjustment functions of the fan assembly. The charging interface 71 is electrically connected to the electronic control component and is used to charge the rechargeable battery pack. With the rechargeable battery pack and charging board, the portable fan can store electricity. After charging, no external power supply is required, making it convenient for users to use in different temporary locations and improving the user experience.

[0046] As a preferred technical solution, such as Figure 2 As shown, in this embodiment, the mounting partition 345 is also provided with an electrical wire hole 347. The first connecting plate 343 near the electrical wire hole 347 is set as a hollow structure. The electrical wire hole 347 and the hollow first connecting plate 343 allow the wires that are electrically connected to the motor assembly 321 and the electronic control assembly to pass through. One end of the wire is electrically connected to the motor assembly 321, and the other end can pass through the electrical wire hole 347 and the hollow first connecting plate 343 on the mounting partition 345, enter the air outlet housing 34 and the gap between the connecting housing 37 and the outer shell 31, and after being designed to run in the gap, enter the interior of the base 2 and be electrically connected to the electronic control assembly.

[0047] In this embodiment, the fan head 3 is fixedly installed on the top of the base 2. As a preferred technical solution, the top of the base 2 in this embodiment is provided with a first arc-shaped recess 211. The first arc-shaped recess 211 is designed to match the shape of the outer shell 31 of the fan head 3, so that the outer shell 31 can fit into the first arc-shaped recess 211 on the base 2, making the overall structure of the fan more compact. Example 2

[0048] This embodiment is embodiment 2 of a fan body with air filtration function, including a fan head 3, as shown. Figures 8-15 As shown, in this embodiment, the fan head 3 includes a housing 31, a fan assembly 32, an air inlet housing 33, and an air outlet housing 34. The housing 31 is a cylindrical housing open at both ends, with an air inlet A and an air outlet B at the two ends. External air enters the housing 31 from the air inlet A and exits from the air outlet B. The fan assembly 32 is located inside the housing 31. The air inlet housing 33 is located at the air inlet end of the housing 31 and has an air inlet channel. The air outlet housing 34 is located at the air outlet end of the housing 31 and has an air outlet channel.

[0049] like Figure 9 and Figure 12 As shown, in this embodiment, the fan head 3 also includes a connecting housing 37, which is fixedly disposed inside the outer casing 31. In this embodiment, the air inlet housing 33 is detachably connected to the end of the connecting housing 37 facing the air inlet end of the outer casing 31. Specifically, as shown... Figure 9 and Figure 12 As shown, in this embodiment, an assembly ring 39 is connected to the side of the connecting housing 37 facing the air inlet end of the outer shell 31. The assembly ring 39 is fixedly connected to the air inlet end of the outer shell 31. As a preferred technical solution, in this embodiment, the assembly ring 39 and the air inlet end of the outer shell 31 are engaged by a retaining ring and a snap fastener. The engagement of the assembly ring 39 and the outer shell 31 in this embodiment is not a limiting provision; other methods that can achieve a detachable connection between the assembly ring 39 and the outer shell 31 are also acceptable. As a preferred technical solution, in this embodiment, the assembly ring 39 is located inside the outer shell 31, that is, the end of the assembly ring 39 does not extend outward beyond the end of the outer shell 31.

[0050] In this embodiment, the air inlet housing 33 is detachably connected to the assembly ring 39. In this embodiment, the air inlet housing 33 is configured as a cylindrical structure with one open end. Figure 15 As shown, in this embodiment, the air inlet housing 33 and the assembly ring 39 are detachably connected by a snap-fit ​​structure 5. The specific configuration of the snap-fit ​​structure 5 in this embodiment is the same as that in Embodiment 1. Specifically, as shown... Figure 5 , Figure 7 and Figure 15 As shown, in this embodiment, the snap-fit ​​structure 5 includes a snap-fit ​​groove 51 and a snap-fit ​​block 52. In this embodiment, the snap-fit ​​block 52 is disposed on the assembly ring 39. In this embodiment, the snap-fit ​​block 52 has an "L"-shaped block structure. Specifically, the snap-fit ​​block 52 includes a first block 521 and a second block 522 connected to each other. The first block 521 is disposed on the assembly ring 39 along the axis of the assembly ring 39, and the second block 522 is disposed on the assembly ring 39 along the circumference of the assembly ring 39.

[0051] The snap-fit ​​groove 51 is located on the outer wall of the open end of the air inlet housing 33, and the shape of the snap-fit ​​groove 51 matches the shape of the snap-fit ​​block 52. When the open end of the air inlet housing 33 is aligned with the assembly ring 39, rotating the air inlet housing 33 will cause the snap-fit ​​block 52 on the assembly ring 39 to snap into the snap-fit ​​groove 51 of the air inlet housing 33. At this time, the air inlet housing 33 is axially limited on the assembly ring 39, and the air inlet housing 33 can be installed on the assembly ring 39. When it is necessary to remove the air inlet housing 33 from the assembly ring 39, simply rotate the air inlet housing 33 in the opposite direction to disengage the snap-fit ​​block 52 from the snap-fit ​​groove 51, and the air inlet housing 33 can be removed from the assembly ring 39.

[0052] As a preferred technical solution, in this embodiment, the second block 522 of the snap-fit ​​block 52 is provided with a positioning recess 523, and the snap-fit ​​groove 51 is provided with a positioning protrusion 511. When the snap-fit ​​block 52 is snapped into the snap-fit ​​groove 51, the positioning protrusion 511 on the snap-fit ​​groove 51 is limited to the positioning recess 523 on the second block 522. The positioning protrusion 511 and the positioning recess 523 can achieve a self-locking position of the snap-fit ​​block 52, thereby enabling the air inlet housing 33 to be stably assembled onto the assembly ring 39. In addition, the positioning protrusion 511 and the positioning recess 523 can also serve as a prompt, that is, when the positioning protrusion 511 is snapped into the positioning recess 523, there will be a certain sense of locking, which can prompt the user that the air inlet housing 33 has been installed. In this embodiment, the air inlet housing 33 can be detachably connected to the air inlet end of the outer shell 31 by the assembly ring 39 and the snap-fit ​​structure 5, which makes the air inlet housing 33 easy to disassemble and assemble, and facilitates the cleaning of the air inlet housing 33 and the maintenance and replacement of internal parts.

[0053] To further improve the stability of the air inlet housing 33 at the air inlet end of the outer casing 31, in this embodiment, the bottom of the outer casing 31 is provided with a threaded hole, and the outer side wall of the air inlet housing 33 is provided with a fixing protrusion 333. The fixing protrusion 333 is provided with a through hole. Screws and other fasteners are passed through the through hole on the fixing protrusion 333 and screwed into the threaded hole at the bottom of the outer casing 31. This arrangement can further increase the stability of the air inlet housing 33 at the air inlet end of the outer casing 31, ensuring that the air inlet housing 33 can be firmly installed on the outer casing 31 when the fan body is working, thus improving the safety of the fan body.

[0054] like Figure 9 and Figure 15 As shown, to improve the cleanliness of the exhaust air, a filter element 4 is also provided inside the air inlet housing 33 in this embodiment. In this embodiment, the filter element 4 is configured as a cylindrical structure. Specifically, in this embodiment, the filter element 4 can be a HEPA filter cartridge. The filter element 4 can filter and clean the air entering the housing 31, effectively preventing dust or particulate matter from harming the user.

[0055] As a preferred technical solution, in this embodiment, the filter element 4 is coaxially disposed within the air inlet housing 33. For example... Figure 8 and Figure 9 As shown, in this embodiment, the side wall of the air inlet housing 33 is provided with a plurality of air inlet holes 331, which serve as air inlet channels for the air inlet housing 33. The air inlet holes 331 are oriented towards the filter element 4, ensuring that the air entering the air inlet housing 33 first contacts and is filtered by the filter element 4 before entering the housing 31. As a preferred technical solution, the side wall of the air inlet housing 33 is circular and bulges outwards, which helps to increase the air inlet area.

[0056] As a preferred technical solution, similar to Embodiment 1, in this embodiment, a plurality of protruding ridges 332 are evenly spaced along the circumference of the inner sidewall of the air inlet housing 33. The protruding ridges 332 can support the filter element 4, so that the filter element 4 can be stably installed against the inside of the air inlet housing 33. At the same time, the protruding ridges 332 make a certain gap between the sidewall of the air inlet housing 33 and the filter element 4. This setting can effectively prevent the filter element 4 from being tightly fitted with the air inlet hole 331. On the one hand, it can reduce wind resistance and ensure air intake; on the other hand, it can allow air to enter the air inlet housing 33 first and then come into contact with the filter element 4 for filtration, ensuring the contact area between the air and the filter element 4, which is beneficial to improving filtration efficiency.

[0057] When the air inlet housing 33 is installed on the assembly ring 39, the filter element 4 is axially confined between the assembly ring 39 and the air inlet housing 33, that is, one end of the filter element 4 abuts against the assembly ring 39, and the other end abuts against the inner bottom of the air inlet housing 33. After the air inlet housing 33 is removed from the assembly ring 39, the filter element 4 can be directly removed from the air inlet housing 33, which facilitates the replacement or cleaning of the filter element 4. In this embodiment, the filter element 4 can filter the air entering the air inlet housing 33, which helps to improve the cleanliness of the exhaust air and can effectively reduce the harm of dust or particulate matter to the user.

[0058] In this embodiment, a filter element 4 is provided inside the air inlet housing 33. At the same time, in this embodiment, the air outlet housing 34, the connecting housing 37 and the fan assembly 32 cooperate to form a pressurization channel. The setting of the pressurization channel can effectively improve the air intake suction of the fan head 3, so that the fan head 3 can still ensure the air intake volume even with the filter element 4 installed.

[0059] like Figure 9 and Figure 12As shown, in this embodiment, the fan assembly 32 is disposed within the connecting housing 37 and mounted on the air outlet housing 34. Specifically, the fan assembly 32 includes a motor assembly 321 and a fan blade 36. The motor assembly 321 is mounted on the side of the air outlet housing 34 facing the air inlet end of the outer casing 31. The motor assembly 321 is used to drive the fan blade 36 to rotate, and the fan blade 36 is connected to the output shaft of the motor assembly 321.

[0060] Specifically, in this embodiment, the fan blade 36 includes an assembly cylinder 361, a hub 362, and several blades 363. The hub 362 has a conical cover structure; specifically, in this embodiment, the hub 362 is a truncated cone shape, with one end open and the other sealed. The sealed end of the hub 362 is the cone tip 3621, which faces the air inlet end of the outer casing 31. The open end of the hub 362 is the flared end 3622, which faces the air outlet end of the outer casing 31. As a preferred technical solution, in this embodiment, the end face diameter D1 of the cone tip 3621 of the hub 362 is 0.08 to 0.32 times the end face diameter D2 of the flared end 3622 of the hub 362. Controlling the cone tip 3621 of the hub 362 within this range can effectively reduce the wind resistance of the airflow entering the fan blade, helping the fan blade generate greater wind pressure and air volume.

[0061] In this embodiment, the radial cross-sectional area of ​​the hub 362 gradually increases from the air inlet end of the outer shell 31 to the air outlet end of the outer shell 31. Specifically, the hub 362 includes an air guide surface 3621 that increases radially from the air inlet end of the outer shell 31 to the air outlet end of the outer shell 31. As a preferred technical solution, at least a portion of the air guide surface 3621 is recessed inward to form a concave surface.

[0062] The assembly cylinder 361 is located at the flared end 3622 of the hub 362, and at least partially inside the hub 362. Specifically, one end of the assembly cylinder 361 is fixedly connected to the inner wall of the hub 362, and the other end of the assembly cylinder 361 extends forward beyond the flared end 3622 of the hub 362. A portion of the motor assembly 321 is located inside the assembly cylinder 361. As a preferred technical solution, in this embodiment, the motor assembly 321 adopts an external rotor brushless motor, a three-phase high-speed micro motor, or other suitable motors, which are selected and adapted according to the specific requirements.

[0063] like Figure 9As shown, in this embodiment, a first mounting sleeve 364 is provided inside the hub 362. Specifically, one end of the first mounting sleeve 364 is fixedly connected to the inside of the conical top 3621 of the hub 362, and the other end of the first mounting sleeve 364 is connected to the output shaft of the motor assembly 321. The motor assembly 321 can drive the entire fan blade 36 to rotate through the first mounting sleeve 364. As a preferred technical solution, in this embodiment, a plurality of reinforcing plates 365 are provided between the outer wall of the first mounting sleeve 364 and the inner wall of the hub 362. The plurality of reinforcing plates 365 are arranged at intervals along the circumference of the first mounting sleeve 364 between the hub 362 and the first mounting sleeve 364. In this embodiment, the setting of reinforcing plates 365 can improve the stability of the first mounting sleeve 364 inside the hub 362, thereby improving the stability of the rotation of the entire fan blade 36.

[0064] like Figure 13 As shown, in this embodiment, the hub 362 includes a wind guide 3624 and a blade connecting part 3625 along the axial direction of the hub 362. In this embodiment, the wind guide 3624 and the blade connecting part 3625 are integrally formed, and a number of blades 363 are evenly fixed on the outer side wall of the blade connecting part 3625 along the circumference of the hub 362.

[0065] As a preferred technical solution, such as Figure 14 As shown, in this embodiment, the axial length L1 of the air guide 3624 is 1 / 10 to 3 / 10 of the axial length L0 of the entire hub 362. This arrangement allows the air guide to play a good guiding role, enabling the airflow to smoothly transition to the blades, which is beneficial to increasing the air intake volume. At the same time, it ensures that the blades have sufficient extension length on the hub, which helps the blades to fully comb the airflow, thereby ensuring the air delivery performance of the fan blades.

[0066] like Figure 13 and Figure 14 As shown, in this preferred embodiment, several blades 363 extend from the air inlet end of the outer casing 31 to the air outlet end of the outer casing 31 and bend at a preset angle along the circumference of the hub 362. As a preferred embodiment, such as... Figure 13 and Figure 14 As shown, in this embodiment, the side 3631 of the blade 363 facing the air inlet end of the outer casing 31 is turned outward in the opposite direction to the circumferential extension of the blade 363 along the hub 362, which is beneficial to improve the air guiding effect of the blade and improve the air intake efficiency of the fan blade.

[0067] like Figure 13 and Figure 14As shown, the distance D3 between the ends of two adjacent blades 363 near the air inlet end of the housing 31 is less than the distance D4 between the ends of two adjacent blades 363 near the air outlet end of the housing 31. As a preferred embodiment, the distance D4 between the ends of two adjacent blades 363 near the air outlet end of the housing 31 is 4.0-6.3 times the distance D3 between the ends of two adjacent blades 363 near the air inlet end of the housing 31. This is beneficial for improving gas flow smoothness, increasing air intake volume, and reducing noise.

[0068] like Figure 9 and Figure 12 As shown, in this embodiment, the connecting housing 37 includes a second inner cylinder portion 372 disposed towards the hub 362. The second inner cylinder portion 372 includes an inner surface 3724 that increases radially from the air inlet end of the outer casing 31 to the air outlet end of the outer casing 31. Figure 9 As shown, the fan blade 36 and the second inner cylinder 372 form a flow guiding channel. The air guiding surface 3623 of the hub 36 and the inner side surface 3724 of the second inner cylinder 372 make the radial cross-sectional area of ​​the flow guiding channel gradually decrease along the direction from the air inlet end of the outer casing 31 to the air outlet end of the outer casing 31. This not only plays a role in obliquely guiding the air, but also plays a role in pressurizing the air, which is beneficial to increasing the air delivery distance and enhancing the air intake suction.

[0069] As a preferred technical solution, in this embodiment, the assembly ring 39 is fixedly connected to the second inner cylinder portion 372. Specifically, the end of the second inner cylinder portion 372 facing the air inlet end of the outer casing 31 is connected to the inner edge of the assembly ring 39. As a preferred technical solution, in this embodiment, the second inner cylinder portion 371 and the assembly ring 39 are integrally formed.

[0070] like Figure 9 and Figure 12 As shown, in this embodiment, the air outlet housing 34 is disposed on the side of the connecting housing 37 facing the air outlet end of the outer casing 31. Specifically, in this embodiment, the air outlet housing 34 includes a first outer cylinder portion 341 and a first inner cylinder portion 342. A plurality of first connecting plates 343 are fixedly disposed between the first outer cylinder portion 341 and the first inner cylinder portion 342. The plurality of first connecting plates 343 are evenly disposed at intervals along the circumference of the first outer cylinder portion 341 and the first inner cylinder portion 342. An air outlet channel 344 of the air outlet housing 344 is formed between two adjacent first connecting plates 343.

[0071] like Figure 9 and Figure 12As shown, in this embodiment, the first inner cylinder portion 342 is configured as a cylindrical structure in the shape of a frustum or a truncated cone. Specifically, in this embodiment, the radial cross-sectional area of ​​the first inner cylinder portion 342 gradually increases along the direction from the air inlet end of the outer casing 31 to the air outlet end of the outer casing 31. Specifically, the first inner cylinder portion 342 includes a pressure surface 3421 that increases radially from the air inlet end to the air outlet end. As a preferred technical solution, the pressure surface 3421 is at least partially radially convex to form a convex surface.

[0072] like Figure 12 As shown, in this embodiment, the first outer cylinder portion 341 extends forward beyond the first inner cylinder portion 342. The first outer cylinder portion 341 is connected to a portion of the top of the first connecting plate 343. In this embodiment, the second inner cylinder portion 372 extends forward toward the air outlet end of the outer casing 31 to form an extension portion 3725. The extension portion 3725 abuts against the end edge of the first outer cylinder portion 341 toward the air inlet end of the outer casing 31, and the inner wall of the extension portion 3725 is in close contact with the top of the first connecting plate 342.

[0073] In this embodiment, the edge of the extension 3725 is tightly abutted against the edge of the first outer cylinder 341 facing the air inlet end of the outer casing 31, and the two are engaged by a retaining ring and a snap fastener. The snap-fit ​​connection between the extension 3725 and the first outer cylinder 341 in this embodiment is not a limiting provision; other methods of connection are also acceptable. The outer top of the first outer cylinder 341 facing the air outlet end of the outer casing 31 is fixedly connected to the air outlet end of the outer casing 31. In this embodiment, the first outer cylinder 341 and the outer casing 31 are engaged by a retaining ring and a snap fastener. The snap-fit ​​connection between the first outer cylinder 341 and the outer casing 31 in this embodiment is not a limiting provision; other methods of connection are also acceptable.

[0074] In this embodiment, a transition channel is formed between the extension 3725 and the first inner cylinder 342 opposite to the extension 3725. The transition channel is located between the air outlet channel and the guide channel, and in this embodiment, the two ends of the transition channel smoothly transition to the guide channel and the air outlet channel, respectively.

[0075] like Figure 10 As shown, in this embodiment, the part connecting the first outer cylinder portion 341 and the first connecting plate 343 is the first outer cylinder connecting portion 3411. In this embodiment, the first outer cylinder connecting portion 3411 is cylindrical, and the inner sidewall of the first outer cylinder connecting portion 3411 is set with a constant diameter. In this embodiment, the inner sidewall of the first outer cylinder connecting portion 3411 and the pressurizing surface 3421 of the first inner cylinder portion 342 cause the radial cross-sectional area of ​​the air outlet channel 344 to gradually decrease from the air inlet end of the outer casing 31 to the air outlet end of the outer casing 31, which can pressurize the air, further increase the air delivery distance and enhance the air intake suction.

[0076] In this embodiment, the airflow channel formed by the fan blade 36 and the second inner cylinder 372, the air outlet channel 344 formed by the first outer cylinder connecting part 3411, the first inner cylinder 342 and the first connecting plate 343, and the transition channel formed between the extension part 3725 and the first inner cylinder 342 together form the pressurization channel in the fan head 3 of this embodiment. The pressurization channel causes the airflow to flow out obliquely, and after being pressurized step by step, the air volume, air delivery distance and air intake suction are greatly increased. This makes the fan head 3 of this embodiment still have a large air intake even when the filter element 4 is set, which is beneficial to meeting the user's experience.

[0077] As a preferred technical solution, such as Figure 10 As shown, in this embodiment, the first outer cylinder portion 341 also includes a first outer cylinder extension portion 3412. The first outer cylinder extension portion 3412 and the first outer cylinder connecting portion 3411 are integrally formed. The inner sidewall of the first outer cylinder extension portion 3412 extends axially and bends outward, so that the entire first outer cylinder extension portion 3412 is flared. In this embodiment, the flared shape of the first outer cylinder extension portion 3412 can guide the airflow and increase the airflow area, thereby improving the user's comfort.

[0078] like Figure 9 and Figure 12 As shown, in this embodiment, a mounting partition 345 is provided inside the first inner cylinder 342. The mounting partition 345 is radially disposed inside the first inner cylinder 342. In this embodiment, the mounting partition 345 is connected to the inner sidewall of the first inner cylinder 342 via a sleeve 3451. In this embodiment, a second mounting sleeve 346 is provided at the center of the side of the mounting partition 345 facing the air inlet end of the outer casing 31. Part of the motor assembly 321 is fixedly assembled on the second mounting sleeve 346.

[0079] like Figure 9 As shown, in this embodiment, the axial distance D5 between the flared end 3622 of the hub 362 and the end of the first inner cylinder 342 facing the air inlet end of the outer casing 31 is between 0.5mm and 3mm. This axial distance D5 not only ensures that the fan blade 36 has room to rotate, i.e., it does not restrict or hinder the normal rotation of the fan blade 36, but also allows the airflow generated by the fan blade 36 to flow smoothly to the air outlet casing 34, which helps reduce noise generated by turbulence.

[0080] like Figure 9 and Figure 12As shown, in this embodiment, a cover 348 is installed on the end of the first inner cylinder 342 near the air outlet end of the outer shell 31. In this embodiment, the front surface 3481 of the cover 348 is set as a concave surface formed by a rearward indentation. In this embodiment, the cover 348 is set as a concave structure, and a negative pressure zone is formed in the area of ​​the cover 348. A part of the airflow flowing out through the air outlet channel 344 will flow towards the negative pressure zone, but will be drawn back by most of the airflow flowing out of the air outlet channel 344 to form a vortex, so that this part of the airflow flows forward again, which can reduce the loss of air volume and wind energy, and achieve the effect of converging fluid and making the air outlet more concentrated.

[0081] In other embodiments, the front surface 3481 of the cover 348 can be configured as a convex surface that protrudes forward and outward. If the cover 348 is configured as a convex structure, the fluid will flow forward along the convex surface, which can also reduce the loss of air volume and wind energy to a certain extent.

[0082] As a preferred technical solution, such as Figure 9 and Figure 12 As shown, in this embodiment, a lighting assembly 35 is provided between the mounting partition 345 facing the air outlet end of the outer casing 31 and the cover 348. Specifically, as... Figure 10 As shown, the lighting assembly 35 includes a mounting cylinder 351, a light strip 352, and a light-transmitting element 353. In this embodiment, the mounting cylinder 351 is located on the side wall of the mounting partition 345 facing the air outlet end of the outer casing 31, and the light strip 352 is arranged around the outer peripheral wall of the mounting cylinder 351. A light-transmitting element 353 is provided at the connecting edge between the cover 348 and the first inner cylinder 342. In this embodiment, the light-transmitting element 353 is made of transparent or semi-transparent material. In this embodiment, the cover 348 and the mounting partition 345 are snapped together. Specifically, in this embodiment, the cover 348 and the mounting partition 345 are snapped together by a buckle and a retaining ring. The snap-fit ​​connection between the cover 348 and the mounting partition 345 in this embodiment is not a limiting provision; other methods that can achieve a detachable connection between the two are also acceptable. In this embodiment, the light strip 352 is hidden, and the light is reflected from the inner wall of the air outlet casing 34, making the light softer.

[0083] As a preferred technical solution, in this embodiment, the outer shell 31 is configured as a two-part split structure. Specifically, as shown... Figure 15As shown, the outer shell 31 includes a first half-shell 311 and a second half-shell 312, which are joined together to form a complete outer shell 31. Specifically, in this embodiment, the opposing sides of the first half-shell 311 and the second half-shell 312 are respectively provided with a first mating connector 313 and a second mating connector 314, wherein the first mating connector 313 is provided with a first connecting hole 3131 and the second mating connector 314 is provided with a second connecting hole 3141. Specifically, in this embodiment, both the first connecting hole 3131 and the second connecting hole 3141 are through holes. The outer side of the second inner cylinder portion 372 is provided with a connecting hole post (not shown in the figure), specifically, the connecting hole post is a threaded hole post. When the first half-shell 311 and the second half-shell 312 are aligned, the first mating connector 313 can be inserted into one side of the second mating connector 314, and the positions of the first connecting hole 3131, the second connecting hole 3141 and the connecting hole post (not shown in the figure) correspond. By setting screws and other fasteners in the first connecting hole 3131, the second connecting hole 3141 and the connecting hole post 3723, the first half-shell 311 and the second half-shell 312 can be mated and fixed together, so as to achieve a stable connection between the outer shell 31 and the second inner cylinder 372.

[0084] In other embodiments, both the first connecting hole 3131 and the second connecting hole 3141 are threaded holes. By fixing the screw into the first connecting hole 3131 and the second connecting hole 3141, the first mating connector 313 and the second mating connector 314 can be fixed together, and the first half-shell 311 and the second half-shell 312 can be mated to form a complete shell 31. The first half-shell 311 and the second half-shell 312 can be stably mated and connected without the need for cooperation with the second inner cylinder 372.

[0085] To further improve the stability of the docking between the first half-shell 311 and the second half-shell 312, and to facilitate the installation of fasteners such as screws at the first connecting hole 3131, the second connecting hole 3141, and the connecting hole post 3723, in this embodiment, the edges of the first half-shell 311 and the second half-shell 312 are respectively provided with buckles and retaining rings. The positioning and engagement of the first half-shell and the second half-shell are achieved through the engagement of the buckles and retaining rings. (See attached image) Figure 15 Only the structural configuration of the retaining ring 3142 is shown in the attached image. Figure 15 The structural configuration of the retaining ring 3142 shown is not a limiting provision; other structures that can achieve the positioning and engagement of the first half-shell 311 and the second half-shell 312 are also acceptable.

[0086] As a preferred technical solution, a cover plate 315 is provided on the outer shell 31 at the positions of the first docking connector 313 and the second docking connector 314. The cover plate 315 can cover the first docking connector 313 and the second docking connector 314, improving the overall aesthetics of the outer shell 31. In this embodiment, the cover plate 315 is detachably connected to the first docking connector 313 and / or the second docking connector 314. Specifically, in this embodiment, a docking post 3151 is provided on the side of the cover plate 315 facing the outer shell 31, and corresponding docking holes 316 are provided on the first docking connector 313 and the second docking connection 314. When the cover plate 315 is closed to the positions of the first docking connector 313 and the second docking connector 314, the docking post 3151 on the cover plate 315 can be inserted into the corresponding docking hole 316. As a preferred technical solution, in this embodiment, the edge of the cover plate 315 is engaged with the edge of the outer shell 31 at the positions of the first docking connector 313 and the second docking connector 314.

[0087] To further improve the stability of the connection between the air outlet housing 34, the connecting housing 37, and the assembly ring 39 and the outer casing 31, such as... Figure 11 and Figure 12 As shown, in this embodiment, the outer wall of the assembly ring 39 is provided with a first limiting insert 393, and the inner wall of the outer shell 31 near the air inlet is provided with a first limiting groove 317. In this embodiment, the outer wall of the first outer cylinder portion 341 is provided with a second limiting insert 3413, and the inner wall of the outer shell 31 near the air outlet is provided with a second limiting groove 318. In this embodiment, the outer wall of the connecting shell 37 is provided with a plurality of insertion slots (not shown in the figure), and the inner wall of the outer shell 31 is provided with a plurality of insertion posts (not shown in the figure) that can be correspondingly inserted into the insertion slots.

[0088] When the connecting housing 37, the assembly ring 39, and the air outlet housing 341 are installed inside the outer casing 31, the first limiting block 393 can be inserted into the first limiting groove 317, and the second limiting block 3413 can be inserted into the second limiting groove 318. Several insertion posts on the inner sidewall of the outer casing 31 can be correspondingly inserted into several insertion slots on the outer sidewall of the connecting housing 37. The arrangement of the first limiting block 393, the first limiting groove 317, the second limiting block 3413, the second limiting groove 318, and the several insertion slots and insertion posts allows the connecting housing 37, the assembly ring 39, and the air outlet housing 341 to be axially confined within the outer casing 31, thereby improving the stability of the connecting housing 37, the assembly ring 39, and the air outlet housing 341 within the outer casing 31.

[0089] like Figure 8As shown, the main body of the fan in this embodiment also includes a base 2 and an electronic control component. The fan head 3 is disposed on the base 2. In this embodiment, the base 2 is a hollow structure. The electronic control component includes components such as a rechargeable battery pack, a charging board, and a control circuit board 73. The rechargeable battery pack and the charging board are electrically connected and disposed inside the base 2. A charging interface 71 is also provided on the side wall of the base 2 near the air inlet end of the outer shell 31. The charging interface 71 is electrically connected to the charging board.

[0090] As a preferred technical solution, in this embodiment, the control circuit board 73 is disposed on the top of the fan head 3. Specifically, in this embodiment, the control circuit board 73 is disposed between the outer casing 31 and the second inner cylinder 372, and the control circuit board 73 is fixed to the second inner cylinder 372 by screws. By providing a wire passage between the fan head 3 and the base 2, the electrical connection between the control circuit board 73 and the rechargeable battery pack and the charging board is realized.

[0091] In this embodiment, the control circuit board 73 is equipped with a fan speed adjustment button 74, which is a knob type used to adjust the fan speed from 1 to 100 levels. The control circuit board 73 also has a power switch 75 and multiple function buttons 76. The power switch 75 controls the fan's start and stop, and the function buttons 76 control functions such as lighting, oscillation, and tilt, depending on the product's capabilities. As a preferred embodiment, the control circuit board 73 also includes a display module 77. The display module 77 displays information such as fan power, fan speed, or other functions, further enhancing the user experience. Correspondingly, the top of the outer casing 31 has openings for the stepless fan speed adjustment button 74, the power switch 75, the multiple function buttons 76, and the display module 77 to extend from.

[0092] To improve the safety of the fan body of this utility model, such as Figure 11 As shown, the control circuit board 73 in this embodiment is also equipped with a sensor 78. In this embodiment, the sensor 78 is configured in conjunction with the air inlet housing 33 to detect whether the air inlet housing 33 is located at a preset displacement position. The sensor 78 is triggered when the air inlet housing 33 is located at the preset displacement position or when the air inlet housing 33 is not located at the preset displacement position. In this embodiment, the sensor 78 is a displacement detection switch. Specifically, when the air inlet housing 33 is removed from the air inlet end of the outer shell 31 or when the air inlet housing 33 is not assembled to the preset position of the air inlet end of the outer shell 31, the fan body automatically loses power and cannot start; while when the air inlet housing 33 is assembled to the preset position of the air inlet end of the outer shell 31, the fan body can be powered normally.

[0093] As a preferred technical solution, such as Figure 12As shown, in this embodiment, the mounting partition 345 is also provided with a wire hole 347. The first connecting plate 343 of the air outlet housing 34 near the control circuit board 73 is set as a hollow structure, and the outside and inside of the air outlet housing 34 are connected. One end of the wire used to electrically connect the motor assembly 321 and the control circuit board 73 is electrically connected to the motor assembly 321, and the other end can pass through the wire hole 347 on the mounting partition 345, and enter the outside of the air outlet housing 34 through the hollow first connecting plate 343 and be electrically connected to the control circuit board 73. The wire used to electrically connect the light strip assembly 35 also enters the outside of the air outlet housing 34 through the hollow first connecting plate 343 and is electrically connected to the control circuit board 73.

[0094] To further improve the safety of the fan body of this utility model, such as Figure 8 As shown, in this embodiment, a protection switch 79 is provided on the base 2. The protection switch 79 is located at the charging plate. The protection switch 79 can control whether the circuit for power supply to the fan body is open or closed. In this embodiment, the protection switch 79 is set as a toggle switch. When the protection switch 79 is toggled to one end, the power supply circuit of the fan body is open, and the motor assembly in the fan body can drive the fan blades to rotate. When the protection switch 79 is toggled to the other end, the power supply circuit of the fan body is closed, and the motor assembly in the fan body does not work, and the fan blades do not rotate. The protection switch 79 can effectively prevent the operator from accidentally turning on the fan by accidentally touching the switch button. Example 3

[0095] This embodiment is an example of a portable fan. This embodiment includes a fixing structure and the fan body of embodiment 1. The fixing structure can fix the fan body to other objects for use. In this embodiment, the fixing structure is a clamping structure. The clamping structure is used to clamp the fan body. That is, the fan body is installed on the clamping structure, so the portable fan can be clamped to a table or rod-shaped object for use. The rod-shaped object is such as the guardrail of a stroller or the guardrail of a bed, which makes the portable fan suitable for more application scenarios.

[0096] In other embodiments, the fixing structure can also be a traditional torsion spring pressing and clamping structure, an octopus-like winding fixing structure, or a belt buckle fixing structure.

[0097] like Figures 16-20As shown, in this embodiment, the gripper structure 1 includes a fixed gripper 11, a movable gripper 12, and an adjustment component 13. The movable gripper 12 is rotatably connected to the fixed gripper 11. When the movable gripper 12 rotates, the opening between the movable gripper 12 and the fixed gripper 11 can be adjusted, allowing the gripper structure to be mounted on other objects. These other objects can be planar structures, such as tabletops, or rod-shaped structures, such as stroller rails or bed rails. It should be noted that the objects that can be mounted on the gripper structure in this embodiment are merely illustrative and not intended to limit the use of the gripper structure. In this embodiment, the adjustment component 13 drives the movable gripper 12 to rotate. By adjusting the component 13, the opening between the fixed gripper 11 and the movable gripper 12 can be adjusted, ensuring that the gripper structure can be securely clamped onto the corresponding object.

[0098] like Figure 17 As shown, in this embodiment, the fixing clamp 11 includes a body portion 111 and a cover portion 112, wherein the cover portion 112 covers the top of the body portion 111. In this embodiment, the cover portion 112 is a circular cover; in other embodiments, the shape of the cover portion 112 may match the shape of the top of the body portion 111. In this embodiment, the cover portion 112 is detachably connected to the top of the body portion 111, and is installed on the top of the body portion 111 by fasteners such as screws or rivets. It should be noted that the fixing method using fasteners such as screws or rivets is a preferred method to achieve a detachable connection between the cover portion 112 and the body portion 111, and is not intended to limit the scope of this utility model.

[0099] To facilitate easy, quick, and accurate installation of the cover portion 112 onto the body portion 111, such as... Figure 18 As shown, in this embodiment, the main body 111 and the cover 112 are quickly positioned and connected via a first positioning groove 141 and a first positioning post (not shown in the figures). Specifically, the first positioning groove 141 is disposed on an outwardly extending arc-shaped block 113 on the main body 111. As a preferred technical solution, in this embodiment, the arc-shaped block 113 and the main body 111 are integrally formed. The first positioning post is disposed at the bottom of the cover 112. By positioning and inserting the first positioning post and the first positioning groove 141, the cover 112 can be quickly and accurately closed onto the main body 111.

[0100] As a preferred technical solution, in this embodiment, fasteners such as screws or rivets for connecting the body portion 111 and the cover portion 112 are located at the positions of the first positioning groove 141 and the first positioning post. Specifically, the bottom of the first positioning groove 141 is provided with a through hole, and the first positioning post is provided with a mounting hole. After the first positioning post is inserted into the first positioning groove 141, the fasteners such as screws or rivets are passed through the through hole on the first positioning groove 141 and connected to the mounting hole on the first positioning post, thereby fixing the cover portion 112 to the body portion 111.

[0101] like Figure 17 and Figure 18 As shown, in this embodiment, the main body 111 is formed by two halves joined together and fixed together by fasteners such as screws or rivets. It should be noted that the method of fixing by fasteners such as screws or rivets is a preferred method to achieve the detachable connection of the two halves of the main body 111 and is not intended to limit the present invention.

[0102] Specifically, such as Figure 18 As shown, the two halves of the main body 111 are respectively provided with a docking groove 15 and a docking post 16. The docking groove 15 is provided with a mounting ring, and the docking post 16 is provided with a blind hole. When it is necessary to assemble the two halves of the main body 111 together, the docking post 16 is first inserted into the docking groove 15 to achieve docking and positioning of the two halves of the main body 111. Then, fasteners such as screws or rivets are used to abut against the mounting ring and the blind hole on the docking post 16 to achieve a stable connection between the two halves of the main body 111.

[0103] To facilitate the assembly of the fixed clamping member 11 and the movable clamping member 12, such as Figure 17 As shown, in this embodiment, the fixing clamp 11 further includes mounting ears 114, which are used for assembly and connection with the movable clamp 12. In this embodiment, two mounting ears 114 are provided, and the two mounting ears 114 are respectively arranged opposite to each other on the bottom sides of the body 111. As a preferred technical solution, in this embodiment, the mounting ears 114 and the body 111 are integrally formed.

[0104] To facilitate the gripper structure's attachment to rod-shaped objects, such as stroller guardrails or crib rails, etc. Figure 17 As shown, in this embodiment, the bottom of the main body 111 is also provided with a second arc-shaped recess 115. The arc-shaped surface of the second arc-shaped recess 115 can better fit with the surface of the rod-shaped object, thereby improving the clamping firmness of the fixing clamp 11 on the rod-shaped structure. As a preferred technical solution, such as Figure 17As shown, in this embodiment, the end of the main body 111 near the opening of the gripper structure is provided with an inclined surface 116. The inclined surface 116 can play a guiding role, so that the rod-shaped structure can enter the opening of the gripper structure along the inclined surface 116, thereby making it convenient and quick to clamp the gripper structure 1 onto the rod-shaped structure.

[0105] As a preferred technical solution, such as Figure 18 As shown, in this embodiment, the main body 111 is provided with a plurality of hollow cavities 117 at intervals. The hollow cavity 117 can reduce the overall weight of the gripper structure. When the gripper structure is assembled and used with a portable fan, the fan can be made lighter and easier to carry.

[0106] like Figure 17 As shown, in this embodiment, the movable clamping member 12 includes a clamping part 121 and an assembly part 122. The clamping part 121 is disposed opposite to the bottom of the main body part 111 and is used to clamp an object. The assembly part 122 is rotatably connected to two assembly ears 114 via a rotating shaft 17. As a preferred technical solution, in this embodiment, the assembly part 122 and the clamping part 121 are integrally formed. As a preferred technical solution, such as... Figure 17 As shown, in this embodiment, the bottom of the movable clamping member 12 is provided with a plurality of strip-shaped grooves 123 at intervals. The grooves 123 not only save materials and reduce costs, but also reduce weight. When the clamping structure is assembled with the fan body, the fan can be made lighter and easier to carry.

[0107] In this embodiment, the adjusting component 13 is used to drive the movable clamping member 12 to rotate. The adjusting component 13 can adjust the opening degree between the fixed clamping member 11 and the movable clamping member 12, allowing the gripper structure to firmly clamp onto the corresponding object. For example... Figures 16-18 As shown, in this embodiment, the adjusting component 13 includes a screw 131. In this embodiment, the clamping part 121 is provided with a mounting through hole 124 at one end near the assembly part 122. A connecting block 132 is provided in the mounting through hole 124. In this embodiment, the connecting block 132 is cylindrical. The screw 131 passes through the connecting block 132 radially and is threadedly connected to the connecting block 132. The clamping part 122 is provided with a clearance hole 125 for the screw 131 to pass through.

[0108] like Figure 18As shown, in this embodiment, one end of the screw 131 extends into the hollow cavity 117 within the body portion 111. The bottom of the body portion 111 is provided with an assembly port 118 for the screw 131 to extend into the hollow cavity 117. The other end of the screw 131 is provided with a handle 133, which facilitates user rotation of the screw. A cap 134 is provided at the end of the screw 131 located in the hollow cavity 117. The cap 134 is screwed onto the end of the screw 131, preventing the screw 131 from dislodging from the assembly port 118. As a preferred embodiment, the end of the screw 131 extending into the hollow cavity 117 is also provided with a bearing 135.

[0109] In this embodiment, rotating the screw 131 causes the movable clamping member 12 to rotate via the connecting block 132, thereby adjusting the opening size between the movable clamping member 12 and the fixed clamping member 11. This facilitates the gripper structure clamping objects of different sizes and shapes. Furthermore, when the screw 131 is not rotating, the position of the movable clamping member 12 can be locked, meaning the opening size between the movable clamping member 12 and the fixed clamping member 11 can be locked, thus ensuring the gripper structure 1 is securely clamped onto the corresponding object.

[0110] As a preferred technical solution, in this embodiment, the gripper structure 1 is detachably mounted on the base 2. This detachable arrangement of the fan body and the gripper structure allows users to choose the appropriate way to use the fan according to their needs. Specifically, the fan body can be clamped onto a table or a rod-like object, such as a stroller rail or bed rail, or it can be held in hand or placed alone on a table, further expanding the fan's usage scenarios. Figures 19-21 As shown, in this embodiment, the gripper structure 1 is detachably mounted on the base 2 via a press-and-buckle structure. The detachable arrangement of the fan body and the gripper structure allows the fan body to be used individually by hand or placed on a table, or it can be used in conjunction with the gripper structure to clamp onto a table or rod-shaped structure, making the portable fan suitable for more usage scenarios.

[0111] like Figure 21 As shown, in this embodiment, the base 2 includes a seat body 21 with a bottom opening and a bottom cover 22. The bottom cover 22 is detachably connected to the bottom of the seat body 21. In this embodiment, the bottom cover 22 and the seat body 21 are connected by fasteners such as screws or rivets. It should be noted that the method of fixing with fasteners such as screws or rivets is a preferred method to achieve the detachable connection between the seat body 21 and the bottom cover 22, and is not intended to limit the scope of this utility model.

[0112] like Figure 21As shown, the press-lock structure in this embodiment includes a press-lock 8 and a first elastic element 9. The first elastic element 9 is used to drive the press-lock 8 to reset. The first elastic element 9 is abutted against the press-lock 8. Both the press-lock 8 and the first elastic element 9 are installed in the base 2. The bottom cover 22 is provided with a slide rail 221. In this embodiment, two press-locks 8 are provided. The two press-locks 8 are arranged opposite each other in the base 2 and are slidably installed in the slide rail 221. The two press-locks 8 can move towards each other or away from each other. In this embodiment, the first elastic element 9 is a spring, and the first elastic element 9 abuts between the two press-locks 8.

[0113] like Figure 21 As shown, in this embodiment, the pressing buckle 8 includes a main body 81, a pressing part 82, and a buckle part 83. The main body 81 is slidably mounted on the slide rail 221. The pressing part 82 is fixedly disposed at one end of the main body 81, and at least partially extends beyond the base 2 for easy pressing by the user. A through hole is provided on the side wall of the base 2 for the pressing part 82 to extend out. A first elastic member 9 abuts against the other end of the main body 81, and a protrusion 84 is provided at the end of the main body 81 that abuts against the first elastic member 9. The end of the first elastic member 9 is sleeved on the protrusion 84. The protrusion 84 improves the stability of the first elastic member 9. When the pressing parts 82 of the two pressing buckles 8 are pressed simultaneously, the two pressing buckles move towards each other and compress the first elastic member 9. When the pressing force on the pressing part 82 is released, the two pressing buckles 8 can move back to their original positions under the elastic action of the first elastic member 9.

[0114] like Figure 21 As shown, the latching part 83 is located at the bottom of the main body 81, and the bottom cover 22 has two openings for the latching parts 83 of the two pressing latches 8 to extend out. The latching parts 83 extend out of the base 2 and can engage with the locking structure provided on the gripper structure. Figure 21 As shown, in this embodiment, the latching part 83 is L-shaped. Figure 16 , Figure 17 , Figure 19 and Figure 20 As shown, in this embodiment, the top of the cover portion 112 is provided with a docking portion 18, and the docking portion 18 is provided with a snap-fit ​​structure. In this embodiment, the snap-fit ​​structure is set as a snap-fit ​​groove 181. Specifically, in this embodiment, the inner sidewalls at both ends of the snap-fit ​​groove 181 are provided with horizontally recessed snap-fit ​​recesses 182, and the snap-fit ​​portion 83 can snap into the snap-fit ​​recesses 182. When the snap-fit ​​portions 83 of the two pressing snap-fit ​​8 are respectively snapped into the two snap-fit ​​recesses 182 of the docking portion 18, the fan body can be fixedly assembled onto the clamping structure.

[0115] When the fan body needs to be removed from the fixed clamp 11, press the pressing parts 82 of the two pressing buckles 8 simultaneously. The two pressing buckles 8 move in the pressing direction and compress the first elastic member 9. At this time, the buckle part 83 can be disengaged from the snap-fit ​​groove 181, that is, the snap-fit ​​state between the buckle part 83 and the snap-fit ​​recess 182 is released. Then the fan body can be removed from the clamp structure. When the fan body needs to be installed on the clamp structure, press the pressing parts 82 of the two pressing buckles 8 simultaneously. The first elastic member 9 is in a compressed state, placing the buckle part 83 in the snap-fit ​​groove 181. Stop pressing the pressing parts 82. The first elastic member 9 drives the two pressing buckles 8 to reset. At this time, the two buckle parts 83 can be re-snapped in the two snap-fit ​​recesses 182 on the snap-fit ​​groove 181, realizing a stable assembly of the fan body and the clamp structure.

[0116] As a preferred technical solution, such as Figure 21 As shown, the bottom of the bottom cover 22 is provided with a docking recess 222 for accommodating the docking part 163. Two openings on the bottom cover 22 for the latching part 83 to extend from are located on the bottom wall of the docking recess 222. The shape of the docking recess 222 matches that of the docking part 18. For ease of docking, the docking part 18 in this embodiment is frustum-shaped, and correspondingly, the docking recess 222 is also frustum-shaped. When the fan body needs to be assembled onto the gripper structure, the docking part 18 can be placed in the docking recess 222 of the bottom cover 22. The docking recess 222 can position the gripper structure, thus facilitating the quick and accurate placement of the latching part 83 into the latching groove 181.

[0117] In this embodiment, the gripper structure and the fan body are detachably connected, allowing users to choose the appropriate way to use the fan according to their needs. The fan body can be clamped onto a table or a rod-like object, such as a stroller rail or bed rail. It can also be held in hand or placed alone on a table, further expanding the fan's usage scenarios. This invention allows for easy separation of the gripper structure and fan body, or installation of the fan body onto the gripper structure, simply by pressing the snap-fit ​​mechanism. This makes the installation and removal of the fan body and gripper structure very simple and quick.

[0118] In other embodiments, the gripper structure can also be adapted to be installed on the bottom of the fan body in Embodiment 2. It can also be adapted to be detachably connected to the bottom of the base of the fan body in Embodiment 2 by pressing the buckle.

[0119] It should be noted that while the preferred embodiments of this utility model are provided in the specification and accompanying drawings, this utility model 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 utility model; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. 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 fan body, characterized in that: The device includes a fan head, comprising a housing, an inlet housing, an outlet housing, and a fan assembly disposed within the housing. The housing is a cylindrical structure open at both ends, with the inlet end and outlet end being the two ends respectively. The outlet housing is disposed at the outlet end of the housing and has an outlet channel. The inlet housing is disposed at the inlet end of the housing and has an inlet channel. A filter is disposed within the inlet housing. The fan assembly includes fan blades and a motor assembly for driving the fan blades to rotate. The motor assembly is mounted on the side of the outlet housing facing the inlet end of the housing. The fan blades are connected to the output shaft of the motor assembly. Each fan blade includes a hub and several blades. The several blades are evenly spaced and fixedly disposed on the outer side wall of the hub along the circumference of the hub. The hub has a conical cover structure, and at least part of the motor assembly is located inside the hub.

2. The fan body according to claim 1, characterized in that: The air inlet housing is configured as a cylindrical structure with one end open. Several air inlet holes are arranged on the side wall of the air inlet housing, and the several air inlet holes form the air inlet channel of the air inlet housing. The filter element is coaxially disposed inside the air inlet housing.

3. The fan body according to claim 1, characterized in that: The hub is truncated cone-shaped and has a cover structure with one end open and the other end sealed. The open end of the hub is a flared end and faces the air outlet of the outer shell. The sealed end of the hub is a cone tip and faces the air inlet of the outer shell. The radial diameter D1 of the cone tip of the hub is 0.08 to 0.32 times the radial diameter D2 of the flared end of the hub.

4. The fan body according to claim 1, characterized in that: The hub includes an air guide section and a blade connecting section connected along the axial direction of the hub. The air guide section is arranged facing the air inlet end of the outer shell. Several blades are evenly fixed on the outer side wall of the blade connecting section along the circumferential distance. The axial length L1 of the air guide section is 1 / 10 to 3 / 10 of the axial length L0 of the entire hub.

5. The fan body according to any one of claims 1-4, characterized in that: Several blades extend from the air inlet end of the housing to the air outlet end of the housing and bend at a preset angle along the circumference of the hub. The side portion of the blade facing the air inlet end of the housing is turned outward in the opposite direction to the circumference of the blade extending along the hub.

6. The fan body according to claim 5, characterized in that: The end-to-end distance D4 between two adjacent blades near the air outlet end of the casing is 4.0-6.3 times the end-to-end distance D3 between two adjacent blades near the air inlet end of the casing.

7. The fan body according to claim 1, characterized in that: The air outlet housing includes a first outer cylinder, a first inner cylinder, and a plurality of first connecting plates. The first outer cylinder is connected to the air outlet end of the outer shell. The first inner cylinder is located inside the first outer cylinder. The plurality of first connecting plates are spaced apart along the circumference of the first outer cylinder and the first inner cylinder. The air outlet channel is formed between two adjacent first connecting plates. The axial distance D5 between the end of the first inner cylinder facing the air inlet end of the outer shell and the end of the hub facing the air outlet end of the outer shell is 0.5mm-3mm.

8. The fan body according to claim 1, characterized in that: The fan head also includes a base, on which the fan head is mounted. The base is hollow and contains a rechargeable battery pack for powering the fan body and a charging board electrically connected to the battery pack. The side wall of the base also has a charging interface and a protection switch for controlling the power supply circuit of the fan body. Both the charging interface and the protection switch are electrically connected to the charging board. When the protection switch is in the closed state, the fan body cannot start working.

9. A portable fan, characterized in that: The device includes the fan body as described in any one of claims 1-8, and further includes a fixing structure for fixing the fan body to another object.

10. The portable fan according to claim 9, characterized in that, The fixing structure is detachably connected to the base via a press-and-buckle structure. The fixing structure can be a claw structure, a torsion spring press-and-buckle structure, an octopus-like wrapping fixing structure, or a belt buckle fixing structure.

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