Portable fan

Abstract

The utility model provides a portable fan which comprises an air outlet part, and the air outlet part comprises an air outlet cover which comprises an inner ring part, an outer ring part and a plurality of connecting blades connected with the inner ring part and the outer ring part; the air inlet cover is connected with the air outlet cover; the fan blade assembly is installed on the rear side of the air outlet cover, and at least part of the fan blade assembly is arranged on the inner side of the air inlet cover; the outer cover is connected with the air outlet cover and the air inlet cover in a covering manner; wherein the fan blade assembly and the inner ring part form a first group, the outer ring part, the air inlet cover and the outer cover form a second group, an air channel is formed among the first group, the second group and the connecting blades, and the distance between the rear end of the hub and the rear end of the air inlet cover is 17.29-17.49 mm. Due to the distance between the rear end of the fan blade assembly and the rear end of the air inlet cover, enough air inlet space is guaranteed, meanwhile, pressurized flow gathering treatment can be conducted on air in the space, and the wind power and the wind effect are enhanced.

Description

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 26, 2024, with application number 202420367103.0. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of fans, and in particular to a portable fan with good wind gathering and flow guiding effects. Background Art

[0003] Existing portable fans typically pursue compact size to enhance portability. The front-to-back thickness of the air outlet is typically small. While this reduces the size, it also reduces wind pressure and efficiency. Furthermore, technical experts often focus on designing the dimensions of components that affect air outlet, while neglecting to consider the dimensions of those that influence air intake. Summary of the Invention

[0004] In view of this, the present application provides a portable fan, which ensures sufficient air intake space by setting the distance between the rear end of the hub and the rear end of the air inlet cover, and at the same time can pressurize and concentrate the wind in this space to enhance wind force and wind effect.

[0005] The present application provides a portable fan, comprising an air outlet portion, wherein the air outlet portion comprises: an air outlet cover, comprising an inner ring portion, an outer ring portion, and a plurality of connecting blades connecting the inner ring portion and the outer ring portion; an air inlet cover, connected to the air outlet cover; a fan blade assembly, installed on the rear side of the air outlet cover, and at least partially arranged on the inner side of the air inlet cover; an outer cover, which is arranged to connect the air outlet cover and the air inlet cover; wherein the fan blade assembly and the inner ring portion are a first group, and the outer ring portion, the air inlet cover and the outer cover are a second group, an air duct is formed between the first group, the second group and the connecting blades, and the distance between the rear end of the fan blade assembly and the rear end of the air inlet cover is 17.29-17.49 mm.

[0006] Furthermore, the fan blade assembly includes a fixing frame, an impeller and a motor, the fixing frame includes a first substrate, and a shaft cylinder extending axially from the first substrate, the shaft cylinder is hollow, the impeller includes a hub, a plurality of blades arranged at intervals around the outside of the hub, and a rotating shaft integrally formed on the inside of the hub, the rotating shaft is inserted forward into the shaft cylinder, and the motor is fixed inside the hub and outside the rotating shaft.

[0007] Furthermore, a second substrate is provided in the inner ring portion, the outer wall of the inner ring portion radially increases from the back to the front, the hub includes a seat body radially increasing from the back to the front, the outer diameter of the front end of the seat body and the outer diameter of the rear end of the inner ring portion differ by less than 1 mm, and when the first substrate is fixed to the second substrate, the interval between the seat body and the inner ring portion is 1.69-1.89 mm.

[0008] Furthermore, a second substrate is provided in the inner ring portion, and a first receiving portion is formed in the inner ring portion on the rear side of the second substrate, and at least part of the fan blade assembly is received in the first receiving portion, and the first substrate is fixed to the rear side of the second substrate; a second receiving portion is formed in the inner ring portion on the front side of the second substrate, and a first circuit board is provided in the second receiving portion, a first through hole is formed through the first substrate, and a second through hole is formed through the second substrate, and the first through hole and the second through hole are at least partially aligned, and the motor includes a coil, and the lead of the coil passes through the first through hole and the second through hole and is electrically connected to the first circuit board; a display panel is fixed at the front end of the first circuit board, and the display panel is used to display at least one of the power level, the current gear position, and the charging status, and the portable fan also includes a front cover provided at the front end of the inner ring portion.

[0009] Furthermore, the air inlet cover includes a first guide member, a second guide member and a third guide member, the first guide member includes a first air guide portion that radially decreases from back to front, the second guide member includes a second air guide portion that radially decreases from back to front, the third guide member includes a third air guide portion that radially decreases, remains radially unchanged, and increases radially in sequence from back to front, the first air guide portion, the second air guide portion and the third air guide portion are arranged closely from back to front; the second guide member also includes an air guide column located in the center, and a plurality of grating blades connecting the air guide column and the second air guide portion and arranged at intervals around; the radially unchanged part of the third air guide portion is located on the rear side of the hub.

[0010] Furthermore, the air outlet hood is installed in the outer cover from front to back, and a first stop portion is provided at the front end of the air outlet hood, which limits the depth of the air outlet hood entering the outer cover. The air inlet hood is installed in the outer cover from back to front and is connected to the air outlet hood, and a second stop portion is provided at the rear end of the air inlet hood, which limits the depth of the air inlet hood entering the outer cover.

[0011] Furthermore, the portable fan also includes a hand-held part, the hand-held part is provided with a fixing part corresponding to the air outlet part, the outer cover is provided with a notch corresponding to the hand-held part, the air outlet cover has a first embedding groove that reveals the notch, and the air inlet cover has a second embedding groove that reveals the notch, when the air outlet cover and the air inlet cover are connected, the first embedding groove and the second embedding groove are connected; part of the fixing part passes upward through the notch and is inserted into the first embedding groove, and the other part of the fixing part passes upward through the notch and is inserted into the second embedding groove.

[0012] Furthermore, the fixing portion includes a first fixing portion and a second fixing portion; the plurality of connecting leaves include a lower connecting leaf, the lower connecting leaf extending downward from the inner ring portion to connect the outer ring portion, the lower connecting leaf having a width in the left and right directions, the lower connecting leaf passing through the upper and lower parts to form a wire groove, the wire groove and the first embedding groove have an overlapping part, the first fixing portion passes upward through the notch and is inserted into the part of the wire groove that overlaps with the first embedding groove; the air inlet cover includes a third guide, the second embedding groove is provided on the third guide, the second fixing portion passes upward through the notch and is inserted into the second embedding groove; a bracket is also provided in the hand-held portion, the bracket has a third fixing portion protruding upward, the third fixing portion and the first fixing portion at least partially overlap, and the third fixing portion passes upward through the notch and is inserted into the wire groove; one fixing member fixes the first fixing portion, the third fixing portion and the lower connecting leaf, and the other fixing member fixes the second fixing portion and the third guide.

[0013] Furthermore, the air inlet cover also includes a first guide and a second guide, the second guide is connected to the radial inner side of the first guide, the second guide includes a second air guide portion, the third guide includes a third air guide portion, and the second air guide portion and the third air guide portion are connected; the first guide protrudes forward to form a fastener, and a fastener is provided on the outer side of the third guide, and the fastener fastens the fastener forward to fix the first guide and the second guide to the rear of the third guide.

[0014] Furthermore, the fastener fastens the buckle portion forward after the fixing member fixes the second fixing portion and the third guide member; the first guide member is further provided with a reinforcement member protruding forward, and the reinforcement member passes through the second fixing portion and the third guide member.

[0015] Compared with the prior art, the portable fan of the present application has the following beneficial effects: the distance between the rear end of the hub and the rear end of the air inlet cover ensures sufficient air inlet space, and at the same time, the wind can be pressurized and concentrated in this space to enhance wind force and wind effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1is a perspective view of the portable fan of the present application;

[0017] Figure 2 It is an exploded schematic diagram of the portable fan of the present application;

[0018] Figure 3 is a cross-sectional view of the portable fan of the present application;

[0019] Figure 4 This is an exploded sectional view of the portable fan of the present application;

[0020] Figure 5 This is a cross-sectional view of the air outlet of the portable fan of the present application as viewed from above;

[0021] Figure 6 This is the first exploded view of the air outlet portion of the portable fan of the present application;

[0022] Figure 7 This is a second exploded view of the air outlet portion of the portable fan of the present application;

[0023] Figure 8 is a perspective view of the handheld portion of the portable fan of the present application;

[0024] Figure 9 is a perspective view of the portable fan blade assembly of the present application;

[0025] Figure 10 It is an exploded view of the blade assembly of the portable fan of the present application;

[0026] Figure 11 is a cross-sectional view of the portable fan blade assembly of the present application;

[0027] Figure 12 It is a three-dimensional diagram of the portable fan impeller of the present application. DETAILED DESCRIPTION

[0028] In order to facilitate a better understanding of the purpose, structure, features and effects of this application, this application is further described in conjunction with the accompanying drawings and specific implementation methods.

[0029] It should be noted that when an element is considered to be “connected to” another element, it can be directly connected to the other element or there may be an intervening element at the same time.

[0030] In this utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features.

[0031] In the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0032] In one embodiment, Figure 1 and Figure 2 FIG2 is a schematic diagram of a portable fan according to the present invention. The portable fan includes an air outlet 100 and a handheld portion 200. The handheld portion 200 is designed to be held by a user or placed upright on a flat surface, while the air outlet 100 is designed to blow air toward the user. In this embodiment, the portable fan is a handheld fan. However, in other embodiments, the portable fan may be a small fan having only the air outlet 100, a desktop fan, a clip fan, a versatile fan, etc., without limitation to the examples listed above.

[0033] In one embodiment, Figures 1 to 3 As shown, the air outlet portion 100 includes an air outlet cover 1, an air inlet cover 2, a fan blade assembly and an outer cover 3. The air inlet cover 2 is connected to the air outlet cover 1, and the outer cover 3 is provided to connect the air outlet cover 1 and the air inlet cover 2. The fan blade assembly is installed on the rear side of the air outlet cover 1, and is at least partially provided on the inner side of the air inlet cover 2. The air outlet cover 1 is installed in the outer cover 3 from front to back, and a first stop portion 11 is provided at the front end of the air outlet cover 1. The first stop portion 11 limits the depth of the air outlet cover 1 entering the outer cover 3. The air inlet cover 2 is installed in the outer cover 3 from back to front and is connected to the air outlet cover 1. A second stop portion 21 is provided at the rear end of the air inlet cover 2. The second stop portion 21 limits the depth of the air inlet cover 2 entering the outer cover 3.

[0034] In one embodiment, Figures 2 to 5 As shown, the air outlet cover 1 includes an inner ring portion 12, an outer ring portion 13, and a plurality of connecting blades 14 connecting the inner ring portion 12 and the outer ring portion 13. The fan blade assembly and the inner ring portion 12 are a first group, and the outer ring portion 13, the air inlet cover 2 and the outer cover 3 are a second group. An air duct is formed between the first group, the second group and the connecting blades 14. The fan blade assembly is installed on the rear side of the air outlet cover 1, so when the wind enters the air duct from the air inlet cover 2, the fan blade assembly is installed downwind, and the connection between the fan blade assembly and the air outlet cover 1 is more reliable and tight, and is less likely to become loose or make abnormal noises.

[0035] In one embodiment, Figure 3 、 Figure 4、 Figure 6 、 Figure 7 and Figure 8 As shown, the handle 200 is provided with a fastening portion 71 corresponding to the air outlet 100. The outer cover 3 is provided with a notch 31 corresponding to the handle 200. The air outlet cover 1 has a first engaging groove 15 that exposes the notch 31, and the air inlet cover 2 has a second engaging groove 243 that exposes the notch 31. When the air outlet cover 1 and the air inlet cover 2 are connected, the first engaging groove 15 and the second engaging groove 243 are connected. A portion of the fastening portion 71 is inserted upward through the notch 31 into the first engaging groove 15, and another portion of the fastening portion 71 is inserted upward through the notch 31 into the second engaging groove 243.

[0036] In one embodiment, Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 and Figure 8 As shown, the fixing portion 71 includes a first fixing portion 711 and a second fixing portion 712. The plurality of connecting leaves 14 include a lower connecting leaf 141, which extends downward from the inner ring portion 12 and connects to the outer ring portion 13. The lower connecting leaf 141 has a width in the left-right direction and extends vertically through the lower connecting leaf 141 to form a wire groove 142. The wire groove 142 and the first embedding groove 15 have an overlapping portion. The first fixing portion 711 passes upward through the notch 31 and is inserted into the portion of the wire groove 142 that overlaps with the first embedding groove 15. A fixing member 8 secures the first fixing portion 711 and the lower connecting leaf 141.

[0037] In one embodiment, Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 7 As shown, the air inlet cover 2 includes a first guide member 22, a second guide member 23, and a third guide member 24. The first guide member 22 includes a first guide portion 221 that radially decreases from back to front. The second guide member 23 includes a second guide portion 231 that radially decreases from back to front. The third guide member 24 includes a third guide portion 241 that radially decreases, remains radially constant, and then increases radially from back to front. The first guide portion 221, the second guide portion 231, and the third guide portion 241 are arranged adjacent to each other from back to front. Wind flows through the first guide portion 221, the second guide portion 231, and the third guide portion 241 in sequence, increasing wind pressure and wind efficiency. The second embedded groove 243 is provided on the third guide member 24. The second fixing portion 712 is inserted into the second embedded groove 243 upward through the notch 31. Another fixing member 8 fixes the second fixing portion 712 and the third guide member 24.

[0038] In one embodiment, Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 7 As shown, the second guide member 23 is connected to the radially inner side of the first guide member 22, and the second guide portion 231 is connected to the third guide portion 241. The first guide member 22 protrudes forward to form a buckle 222, and the outer side of the third guide member 24 is provided with a buckle 242. The buckle 222 buckles forward with the buckle 242 to fix the first guide member 22 and the second guide member 23 to the rear of the third guide member 24. The action of the buckle 222 buckling forward with the buckle 242 occurs after the fixing member 8 fixes the second fixing portion 712 and the third guide member 24. The first guide member 22 also has a reinforcement member 223 protruding forward. The reinforcement member 223 passes through the second fixing portion 712 and the third guide member 24 to further fix the handheld portion 200 and the third guide member 24. In the case where no or only a few fixing parts 8 are needed, the air outlet cover 1, the air inlet cover 2, the outer cover 3 and the handheld part 200 can also be well fastened to each other, which is convenient for disassembly, repair and replacement of each component.

[0039] In one embodiment, Figure 2 、 Figure 4 、 Figure 9 、 Figure 10 and Figure 11 As shown, the fan blade assembly includes a fixed frame 4, an impeller 5 and a motor 6. The fixed frame 4 includes a first base plate 41 and a shaft cylinder 42 extending axially from the first base plate 41, and the shaft cylinder 42 is hollow. The impeller 5 includes a hub 51, a plurality of blades 52 arranged around the outside of the hub 51 at intervals, and a rotating shaft 53 integrally formed on the inside of the hub 51. The hub 51 is open to the front, and the motor 6 is arranged inside the hub 51 and outside the rotating shaft 53. Specifically, the motor 6 includes a stator assembly 61 and a rotor assembly 62, and the stator assembly 61 and the rotor assembly 62 are arranged inside the hub 51 and outside the rotating shaft 53. Part of the rotating shaft 53 is fixed to the inside of the hub 51, and the front end of the rotating shaft 53 extends forward beyond the front end of the hub 51, and the rotating shaft 53 extends forward into the shaft cylinder 42. The first base plate 41 is used to fix the motor 6 and the impeller 5 to other components. The fan blade assembly is formed by first fixing the fixing frame 4, the motor 6 and the impeller 5 together to form a modular structure, and then the first substrate 41 of the fixing frame 4 is fixed to other components, thereby facilitating installation and fixation, and facilitating disassembly and maintenance.

[0040] In one embodiment, Figure 10 and Figure 11As shown, the rotor assembly 62 includes a housing 621, a magnetic ring 622 disposed inside the housing 621, and a bearing 623 disposed in the shaft cylinder 42. The stator assembly 61 is disposed inside the magnetic ring 622 and outside the shaft cylinder 42. A first step 421 is provided on the outside of the shaft cylinder 42, and the stator assembly 61 abuts the first step 421 forward. A second step 422 is provided on the inside of the shaft cylinder 42 facing rearward, and a third step 423 is provided on the inside of the shaft cylinder 42 facing forward. Two bearings 623 are provided, one of which abuts the second step 422 forward, and the other abuts the third step 423 backward. A stopper is provided at the front end of the rotating shaft 53 to ensure that the rotating shaft 53 can rotate stably and long-term within the shaft cylinder 42. By providing the first step portion 421 , the second step portion 422 and the third step portion 423 , the stator assembly 61 and the rotor assembly 62 are stably fixed to the shaft cylinder 42 , thereby enhancing the stable connection between the motor 6 and the fixing bracket 4 .

[0041] In one embodiment, Figures 9 to 11 As shown, the hub 51 includes a base 511 that radially increases from rear to front, a first extension 512 that protrudes forward from the inner side of the base 511, and a second extension 513 that protrudes inward from the inner side of the base 511. The first extension 512 and the second extension 513 form a right-angled stop structure. The front end of the first extension 512 extends forward beyond the front end of the base 511, and the front end of the rotating shaft 53 extends forward beyond the front end of the first extension 512. The motor 6 is disposed outside the rotating shaft 53, enters the impeller 5 along the first extension 512, and is secured to the second extension 513. Specifically, the stator assembly 61 and the rotor assembly 62 are arranged on the radial inner side of the first extension portion 512, and the side wall and rear wall of the casing 621 surround the radial outer side and rear side of the magnetic ring 622. The side wall of the casing 621 is correspondingly arranged on the radial inner side of the first extension portion 512, and the rear wall of the casing 621 is correspondingly arranged on the front side of the second extension portion 513.

[0042] In one embodiment, Figure 11 and Figure 12As shown, the hub 51 also includes a sleeve 514 protruding from the center of the inner side of the base 511. The rotating shaft 53 is integrally formed with the sleeve 514. A gap is provided between the sleeve 514 and the rear bearing 623. An elastic member 63 is provided between the sleeve 514 and the rear bearing 623 to prevent the sleeve 514 from striking the rear bearing 623 when the portable fan is subjected to external impact or vibration, and to cushion the vibration generated by the rotation of the hub 51. A plurality of ribs 515 extend outward from the sleeve 514 to the base 511. These ribs 515 reinforce the hub 51 and cushion the vibration generated by its rotation. The front ends of the ribs 515 do not extend beyond the front ends of the second extensions 513, and the ribs 515 do not interfere with the rotor assembly 62 and the stator assembly 61.

[0043] In one embodiment, Figure 2 、 Figure 3 、 Figure 4 and Figure 9 As shown, a second substrate 121 is provided in the inner ring portion 12. As mentioned above, the first substrate 41 is used to fix the motor 6 and the impeller 5 to other components. In this embodiment, the first substrate 41 and the second substrate 121 are fixedly connected to fix the fan blade assembly to the air outlet cover 1. By fixing the first substrate 41 and the second substrate 121, the fan blade assembly can be easily combined with or separated from the air outlet cover 1, thereby greatly improving the convenience of disassembly and assembly between the fan assembly and the air outlet cover 1, and shortening the disassembly and assembly time between the fan assembly and the air outlet cover 1. In this embodiment, the first substrate 41 and the second substrate 42 are fixedly connected by the fixing member 8. Of course, in other embodiments, the first substrate 41 and the second substrate 42 can be connected in other ways.

[0044] In one embodiment, Figures 2 to 3 、 Figures 9 to 11 As shown, the shaft cylinder 42 includes a protrusion 424 extending axially forward from the first base plate 41. The second base plate 121 is formed with a positioning hole 122, and the protrusion 424 is fixed forward to the positioning hole 122. The inner ring portion 12 is formed with a first receiving portion 123 on the rear side of the second base plate 121, and at least a portion of the fan blade assembly is received in the first receiving portion 123. The first extension portion 512 and the inner ring portion 12 at least partially overlap in the radial direction, which can reduce the ingress of dust and impurities into the inner side of the hub 51 and effectively reduce the noise when the motor 6 is driven.

[0045] In one embodiment, Figure 5As shown, the outer wall of the inner ring portion 12 radially increases from back to front, and the hub 51 includes a seat body 511 that radially increases from back to front. The outer diameter of the seat body 511 differs from the outer diameter of the inner ring portion 12 by less than 1 mm. When the first substrate 41 is fixed to the second substrate 121, the spacing between the seat body 511 and the inner ring portion 12 is 1.69-1.89 mm. Wind flows smoothly from the outside of the seat body 511 to the outside of the inner ring portion 12. The continuous radially increasing path helps to increase wind pressure and expand the air outlet range and distance.

[0046] In one embodiment, Figure 2 、 Figure 4 and Figure 5 As shown, the inner ring portion 12 is formed with a second receiving portion 124 on the front side of the second substrate 121, and the first circuit board 91 is disposed in the second receiving portion 124. A first through-hole 411 is formed through the first substrate 41, and a second through-hole 125 is formed through the second substrate 121. The first through-hole 411 and the second through-hole 125 are at least partially aligned. The stator assembly 61 includes a coil, the leads of which pass through the first through-hole 411 and the second through-hole 125 and are electrically connected to the first circuit board 91. A display panel 92 is fixed to the front end of the first circuit board 91. The display panel 92 is used to display at least one of the battery level, the current gear position, and the charging status. The portable fan also includes a front cover 16 disposed on the front end of the inner ring portion 12. The front cover 16 protects the first circuit board 91 and the display panel 92. The front cover 16 is transparent or translucent to allow the contents of the display panel 92 to be visible.

[0047] In one embodiment, Figure 3 and Figure 4As shown, the handheld portion 200 is equipped with a power supply 95, a control center 94, and a second circuit board 93. The first circuit board 91 is electrically connected to the control center 94, and the wires connecting the first circuit board 91 and the control center 94 pass through the wire groove 142 formed by the lower connecting leaf 141. The second circuit board 93 is electrically connected to the control center 94, and the power supply 95 is also electrically connected to the control center 94. The power supply 95 can supply power to any one, two, or all of the fan blade assembly, the display panel 92, and the switch 96 to enable the normal operation of the portable fan. The portable fan also includes a switch 96, which is located on the handheld portion 200 and electrically connected to the first circuit board 91. The switch 96 is used to adjust the wind speed. The portable fan also includes a charging unit 97, which is located on the handheld portion 200 and electrically connected to the control center 94. When the charging unit 97 is connected to an external power source, it can charge the power supply 95. The charging unit 97 can also directly provide power to drive the motor 6.

[0048] In one embodiment, Figure 3 、 Figure 4 and Figure 8 As shown, the handle 200 is provided with a bracket 72, which is used to position and secure the second circuit board 93 and the control center 94. The bracket 72, the second circuit board 93, and the control center 94 are located above the power supply 95. The bracket 72 has an upwardly protruding third fixing portion 721, which at least partially overlaps with the first fixing portion 711. The third fixing portion 721 is inserted upward through the notch 31 into the wire groove 142 and secures the wires connecting the first circuit board 91 and the control center 94. The fixing member 8 secures the first fixing portion 711, the third fixing portion 721, and the lower connecting leaf 141.

[0049] In one embodiment, Figures 3 to 5 As shown, the distance between the rear end of the hub 51 and the rear end of the air inlet cover 2 is 17.29-17.49 mm. This distance between the rear end of the hub 51 and the rear end of the air inlet cover 2 ensures sufficient air intake space and allows the wind to be pressurized and concentrated within this space, thereby enhancing wind force and wind efficiency.

[0050] In one embodiment, Figures 3 to 5As shown, the second guide member 23 also includes a centrally located wind guide column 232 and a plurality of grating blades 233 connecting the wind guide column 232 and the second air guide portion 231 and spaced around the guide column 232. The wind is combed by the grating blades 233 and enters the air outlet 100, where the wind guide column 232 and the second air guide portion 231 focus and increase pressure. The radially constant portion of the third air guide portion 241 is located behind the hub 51. From back to front, the wind passes sequentially through the first air guide portion 221, the second air guide portion 231, and the radially decreasing, radially constant portion of the third air guide portion 241, continuously pressurizing and converging the wind, enhancing wind pressure and wind efficiency. As the wind passes through the radially increasing seat 511, the radially increasing portion of the third air guide portion 241 expands radially in the same direction as the seat 511, further expanding and transporting the pressurized and focused wind forward and outward, further enhancing wind pressure and wind efficiency, and increasing the air outlet range.

[0051] In one embodiment, Figure 9 and Figure 12 As shown, the impeller 5 includes a plurality of connecting ribs 54, and the plurality of connecting ribs 54 are arranged at intervals and around the base 511 and the first extension 512. The impeller 5 also includes a balance compensation structure, and the balance compensation structure is provided on the connecting ribs 54, so that the impeller 5 has a better dynamic balance. In addition, a plurality of connecting ribs 54 are provided to connect the base 511 and the first extension 512, thereby enhancing the structural strength between the base 511 and the first extension 512, and also dispersing the vibration generated by the rotation of the impeller 5. The connecting ribs 54 include a first surface connected to the base 511, a second surface connected to the first extension 512, and a third surface radially connecting the first surface and the second surface. The first surface, the second surface and the third surface are connected to each other, further enhancing the structural strength between the first extension 512 and the base 511.

[0052] In one embodiment, Figure 9 、 Figure 11 and Figure 12 As shown, the third surface is flush with the end of the seat body 511. The balance compensation structure is provided on the third surface to facilitate detection and adjustment of the balance of the impeller 5. The radial length of the third surface is 2.47-2.67 mm, and the width of the third surface is 0.60-0.80 mm, which can well set the balance compensation structure.

[0053] In one embodiment, the balance compensation structure is made of plastic or a plastic-metal hybrid, and is molded and attached to the connecting rib 54. In other embodiments, the balance compensation structure may also be made of metal, and is mechanically fixed to the connecting rib 54.

[0054] In one embodiment, Figure 12 As shown, the number of the connecting ribs 54 is 25, and a large number of the connecting ribs 54 can be used to set the balance compensation structure, which can better set the dynamic balance of the impeller 5. The number of the blades 52 is 5, and the number of the blades 52 is an odd number, which is more conducive to setting the dynamic balance of the impeller 5. This is because when the blades 52 of the impeller 5 are an even number, a symmetrical arrangement is formed, which not only makes it difficult to adjust the balance of the impeller 5 itself, but also easily causes the impeller 5 to generate more resonance when running at high speed, thereby causing the impeller 5 to suffer fatigue caused by the resonance, and eventually the blades 52 may break. Of course, the number of the connecting ribs 54 and the blades 52 is not limited to this.

[0055] In one embodiment, Figure 9 and Figure 12 As shown, the connecting ribs 54 extend radially in a straight line, and the blades 52 extend radially in a curved manner.

[0056] The above detailed description is only an illustration of the preferred embodiment of the present application, and does not limit the patent scope of the present application. Therefore, all equivalent technical changes made by using the description and illustrations of this invention are included in the patent scope of this invention.

Claims

1. A portable fan, comprising an air outlet, characterized in that: The air outlet portion includes: An air outlet cover, comprising an inner ring portion, an outer ring portion, and a plurality of connecting blades connecting the inner ring portion and the outer ring portion; An air inlet cover connected to the air outlet cover; a fan blade assembly, mounted on the rear side of the air outlet cover and at least partially disposed on the inner side of the air inlet cover; An outer cover is connected to the air outlet cover and the air inlet cover; Among them, the fan blade assembly and the inner ring part are the first group, the outer ring part, the air inlet cover and the outer cover are the second group, and an air duct is formed between the first group, the second group and the connecting blade. The distance between the rear end of the fan blade assembly and the rear end of the air inlet cover is 17.29-17.49mm.

2. The portable fan according to claim 1, wherein: The fan blade assembly includes a fixing frame, an impeller and a motor. The fixing frame includes a first substrate and a shaft cylinder extending axially from the first substrate. The shaft cylinder is hollow. The impeller includes a hub, a plurality of blades arranged at intervals around the outside of the hub, and a rotating shaft integrally formed on the inside of the hub. The rotating shaft is inserted forward into the shaft cylinder. The motor is fixed inside the hub and outside the rotating shaft.

3. The portable fan according to claim 2, wherein: A second substrate is provided inside the inner ring portion, and the outer wall of the inner ring portion radially increases from the back to the front. The hub includes a seat body that radially increases from the back to the front. The outer diameter of the front end of the seat body and the outer diameter of the rear end of the inner ring portion differ by less than 1 mm. When the first substrate is fixed to the second substrate, the interval between the seat body and the inner ring portion is 1.69-1.89 mm.

4. The portable fan according to claim 2, wherein: A second substrate is provided in the inner ring portion, and a first receiving portion is formed on the rear side of the second substrate of the inner ring portion, and at least a portion of the fan blade assembly is received in the first receiving portion, and the first substrate is fixed to the rear side of the second substrate; a second receiving portion is formed on the front side of the second substrate of the inner ring portion, and a first circuit board is provided in the second receiving portion, a first through hole is formed through the first substrate, and a second through hole is formed through the second substrate, and the first through hole and the second through hole are at least partially aligned, and the motor includes a coil, and the lead of the coil passes through the first through hole and the second through hole and is electrically connected to the first circuit board; a display panel is fixed at the front end of the first circuit board, and the display panel is used to display at least one of the power level, the current gear position, and the charging status. The portable fan also includes a front cover provided at the front end of the inner ring portion.

5. The portable fan according to claim 2, wherein: The air inlet cover includes a first guide member, a second guide member and a third guide member. The first guide member includes a first air guide portion that radially decreases from back to front, the second guide member includes a second air guide portion that radially decreases from back to front, and the third guide member includes a third air guide portion that radially decreases, remains radially unchanged, and increases radially in sequence from back to front. The first air guide portion, the second air guide portion and the third air guide portion are arranged adjacent to each other from back to front; the second guide member also includes an air guide column located in the center, and a plurality of grating blades connecting the air guide column and the second air guide portion and arranged at intervals around; the radially unchanged portion of the third air guide portion is located on the rear side of the hub.

6. The portable fan according to claim 1, wherein: The air outlet hood is installed in the outer cover from front to back, and a first stop portion is provided at the front end of the air outlet hood, which limits the depth of the air outlet hood entering the outer cover. The air inlet hood is installed in the outer cover from back to front and is connected to the air outlet hood, and a second stop portion is provided at the rear end of the air inlet hood, which limits the depth of the air inlet hood entering the outer cover.

7. The portable fan according to claim 6, wherein: The portable fan also includes a hand-held portion, the hand-held portion is provided with a fixing portion corresponding to the air outlet portion, the outer cover is provided with a notch corresponding to the hand-held portion, the air outlet cover has a first embedding groove that reveals the notch, and the air inlet cover has a second embedding groove that reveals the notch. When the air outlet cover and the air inlet cover are connected, the first embedding groove and the second embedding groove are connected; a part of the fixing portion passes upward through the notch and is inserted into the first embedding groove, and another part of the fixing portion passes upward through the notch and is inserted into the second embedding groove.

8. The portable fan according to claim 7, wherein: The fixing portion includes a first fixing portion and a second fixing portion; the plurality of connecting leaves include a lower connecting leaf, the lower connecting leaf extending downward from the inner ring portion to connect the outer ring portion, the lower connecting leaf having a width in the left and right directions, the lower connecting leaf passing through the upper and lower parts to form a wire groove, the wire groove and the first embedding groove have an overlapping part, and the first fixing portion passes upward through the notch and is inserted into the part of the wire groove that overlaps with the first embedding groove; the air inlet cover includes a third guide member, the second embedding groove is provided on the third guide member, and the second fixing portion passes upward through the notch and is inserted into the second embedding groove; a bracket is also provided in the hand-held portion, the bracket has a third fixing portion protruding upward, the third fixing portion and the first fixing portion at least partially overlap, and the third fixing portion passes upward through the notch and is inserted into the wire groove; one fixing member fixes the first fixing portion, the third fixing portion and the lower connecting leaf, and the other fixing member fixes the second fixing portion and the third guide.

9. The portable fan according to claim 8, wherein: The air inlet cover also includes a first guide and a second guide, the second guide is connected to the radial inner side of the first guide, the second guide includes a second air guide portion, the third guide includes a third air guide portion, the second air guide portion and the third air guide portion are connected; the first guide protrudes forward to form a fastener, and a fastener is provided on the outer side of the third guide, and the fastener fastens the fastener forward to fix the first guide and the second guide to the rear of the third guide.

10. The portable fan according to claim 9, wherein: The fastener fastens the buckle forwardly after the fixing member fixes the second fixing member and the third guide member. The first guide member is further provided with a reinforcement member protruding forwardly, and the reinforcement member passes through the second fixing member and the third guide member.

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