Portable fan

Abstract

The invention provides a portable fan which comprises a shell, a fan body and a fan cover. The shell is through in the front-back direction, and air enters from the rear side and exits from the front side. The air outlet component is contained in the shell, the air outlet component comprises a barrel and a brake assembly contained in the barrel, and the brake assembly is used for generating air; and the contraction piece is contained in the shell and arranged on the front side of the air outlet component, the contraction piece comprises a contraction face located on the inner side, the contraction face is arranged towards the air channel, and the contraction face shrinks in the radial direction from back to front. According to the air conditioner, the contraction piece is arranged, the contraction piece is provided with the contraction face facing the air channel, the contraction face is reduced in the radial direction from back to front, air flow guided out by the air outlet component can be contracted and converged, the air pressure is enhanced, and the air force is increased.

Description

Technical Field

[0001] The present application relates to the technical field of fans, and in particular to a portable fan with good air output effect. Background Art

[0002] A fan is an electrical appliance that generates air for cooling. It is usually powered by electricity to produce airflow. The built-in fan blades rotate when powered on, converting mechanical energy into wind energy, thereby producing air to achieve a cooling effect.

[0003] However, the blades of the fan usually extend spirally along the hub, so the airflow generated by the rotation of the fan blades is turbulent, and the rotating airflow greatly reduces the cooling effect. In addition, part of the rotating airflow disperses radially after being blown out of the air outlet, and the final axial air volume and wind pressure blown to the user are small, the air outlet effect is poor, and it cannot meet the user's needs for blowing air to cool down. Summary of the Invention

[0004] In view of this, the present application provides a portable fan, comprising: a housing, which is through-through from front to back, with air entering from the rear and exiting from the front; an air outlet component, which is housed in the housing, and which includes a cylinder and a brake assembly housed in the cylinder, the brake assembly being used to generate wind; a contraction component, which is housed in the housing and disposed on the front side of the air outlet component, and which includes a contraction surface located on the inside, which is disposed toward the air duct and which radially decreases from the rear to the front. By providing a contraction component, and having a contraction surface facing the air duct and which radially decreases from the rear to the front, it is advantageous to contract and converge the airflow directed out of the air outlet component, thereby increasing wind pressure and wind force.

[0005] The present application provides a portable fan, comprising: a shell, which is through-through from front to back, with air entering from the rear side and exhausting from the front side; an air outlet component, which is accommodated in the shell, and the air outlet component comprises a cylinder and a brake assembly accommodated in the cylinder, and the brake assembly is used to generate wind; a contraction component, which is accommodated in the shell and arranged on the front side of the air outlet component, and the contraction component comprises a contraction surface located on the inner side, the contraction surface is arranged toward the air duct, and the contraction surface radially shrinks from the back to the front.

[0006] Furthermore, the cylinder includes an outer ring portion, an inner ring portion, and a plurality of first guide vanes connecting the outer ring portion and the inner ring portion; the air outlet component also includes a flow guide member, which is axially arranged between the cylinder and the contraction member, and the flow guide member includes an outer shell portion, an inner shell portion, and a plurality of second guide vanes connecting the outer shell portion and the inner shell portion; the diameter of the inner wall of the outer ring portion remains unchanged from back to front, and the diameter of the inner wall of the outer shell portion remains unchanged from back to front, and the diameter of the inner wall of the outer ring portion is equal to the diameter of the inner wall of the outer shell portion.

[0007] Furthermore, the brake assembly includes a fan and a motor, the fan includes a wheel shell, and a plurality of blades arranged at intervals around the outside of the wheel shell, and the motor is accommodated on the inner side of the wheel shell; the wheel shell radially increases from back to front, the inner ring portion extends radially unchanged from back to front, and the inner shell portion radially decreases from back to front, the maximum diameter of the wheel shell and the diameter of the inner ring portion differ by less than 5 mm, the maximum diameter of the inner shell portion and the diameter of the inner ring portion differ by less than 5 mm, the maximum diameter of the wheel shell, the maximum diameter of the inner shell portion and the diameter of the inner ring portion are all in the range of 19.24 to 23.24 mm; the spacing between the front end of the wheel shell and the inner ring portion is 0.5 to 3 mm, and the spacing between the inner shell portion and the inner ring portion is 0.15 to 1 mm.

[0008] Furthermore, the maximum diameter of the contraction surface is equal to the diameter of the inner wall of the outer shell, the minimum diameter of the contraction surface is greater than the maximum diameter of the inner shell, and the minimum diameter of the contraction surface is 21.05 to 25.05 mm.

[0009] Furthermore, the inner shell portion protrudes forward relative to the outer shell portion, the front end of the inner shell portion is located radially inward of the contraction surface, and the front end of the contraction surface is located in front of the front end of the inner shell portion.

[0010] Furthermore, it also includes a soft shell, which is arranged in the shell body and covers the outside of the cylinder, the guide member and the contraction member. The soft shell includes an annular portion, and a front edging portion and a rear edging portion respectively connected to the front and rear ends of the annular portion. The annular portion covers the radial outside of the outer ring portion, the outer shell portion and the contraction member. The front edging portion is arranged at the front end of the contraction member, and the edge of the front edging portion is flush with the front end of the contraction surface. The rear edging portion is arranged at the rear end of the outer ring portion, and the edge of the rear edging portion is flush with the rear end of the inner wall of the outer ring portion.

[0011] Furthermore, it also includes a front guide member, a rear guide member and an air inlet net, the front guide member is embedded in the front end of the shell, and the rear end of the front guide member is against the front edging portion, the front guide member includes a front guide surface located on the inner side, the front guide surface radially increases from the back to the front, and the rear end of the front guide surface is flush with the edge of the front edging portion; the rear guide member is embedded in the rear end of the shell, and the front end of the rear guide member and the rear edging portion are clamped to fix the air inlet net, the rear guide member includes a rear guide surface located on the inner side, the rear guide surface radially decreases from the back to the front, and the front end of the rear guide surface is flush with the edge of the rear edging portion.

[0012] Furthermore, the axial length of the shell is 61 to 65 mm, the axial length of the shell, the leading guide and the rear guide when installed is 66 to 70 mm, the axial length of the soft shell is 54.5 to 58.5 mm, the axial length from the rear end of the outer ring portion to the front end of the contraction portion is 46.8 to 50.5 mm, the axial length from the rear end of the wheel shell to the front end of the inner shell portion is 43.5 to 47.5 mm, the distance from the rear end of the wheel shell to the rear end of the rear guide is 3.8 to 7.8 mm, and the distance from the front end of the inner shell portion to the front end of the leading guide portion is 14.75 to 18.75 mm.

[0013] Furthermore, the number of the blades is 9, the number of the first guide vanes is 7, and the number of the second guide vanes is 7. The multiple first guide vanes and the multiple second guide vanes are spaced apart in the radial direction, and the axial projection of one first guide vane is located between the axial projections of two adjacent second guide vanes; the axial spacing between the first guide vane and the blade is 1.25 to 3.25 mm, and the axial spacing between the second guide vane and the first guide vane is 0.4 to 1.4 mm.

[0014] Furthermore, the first guide vane includes a first section and a second section extending backward from the first section, the first section connects the inner ring portion and the outer ring portion at the same time, the second section is only connected to the outer ring portion, and the radial inner side of the second section is spaced from the wheel shell; from back to front, the blade extends in a clockwise spiral, the second section extends in a counterclockwise spiral, the first section extends straight, and the second guide vane first extends in a clockwise spiral and then extends straight.

[0015] Compared with the prior art, the portable fan of the present application has the following beneficial effects: by setting the contraction part, and the contraction part has the contraction surface facing the air duct, and the contraction surface radially shrinks from the back to the front, it is beneficial to contract and converge the airflow discharged from the air outlet component, enhance the wind pressure, and increase the wind force. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 is an exploded view of the portable fan of the present application;

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

[0019] Figure 4 is a side sectional view of an air outlet component and a retracting component in the portable fan of the present application;

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

[0021] Figure 6 is a rear cross-sectional view of the portable fan of the present application;

[0022] Figure 7 is another cross-sectional view of the portable fan of the present application from the rear;

[0023] Figure 8 It is a three-dimensional diagram of the blower in the portable fan of the present application. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] In this application, descriptions such as “first”, “second”, etc. are only used for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0027] In the description of this application, 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 this application 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, and therefore should not be understood as a limitation on this application.

[0028] In one embodiment, Figure 1 The figure shows a portable fan 1. In this embodiment, the portable fan 1 is a handheld fan, and thus includes a handheld portion (not numbered, the same below), within which is disposed a circuit board and a battery (not numbered, the same below). The circuit board is used for control circuitry, and the battery is used for power supply. In other embodiments, the portable fan 1 may also be a clip fan, a desktop fan, a neck-hanging fan, or other portable fans.

[0029] In one embodiment, Figures 2 to 4As shown, the portable fan includes a shell 1, an air outlet component and a contraction component 6. The shell 1 is through-connected from front to back, with air entering from the rear side and out from the front side. The air outlet component is accommodated in the shell 1, and the air outlet component includes a cylinder 2 and a brake assembly accommodated in the cylinder 2. The brake assembly includes a fan 3 and a motor 4. The motor 4 drives the fan 3 to rotate and generate wind. The contraction component 6 is accommodated in the shell 1 and is arranged on the front side of the air outlet component. The contraction component 6 includes a contraction surface 61 located on the inner side. The contraction surface 61 is arranged toward the air duct, and the contraction surface 61 radially shrinks from the back to the front. The contraction component 6 is provided, and the contraction component 6 has the contraction surface 61 facing the air duct, and the contraction surface 61 radially shrinks from the back to the front, which is conducive to contracting and converging the airflow derived from the air outlet component, enhancing the wind pressure, and increasing the wind force.

[0030] In one embodiment, Figure 2 、 Figure 3 、 Figure 4 and Figure 6 As shown, the cylinder 2 includes an outer ring portion 21, an inner ring portion 22, and a plurality of first guide vanes 23 connecting the outer ring portion 21 and the inner ring portion 22. The outer ring portion 21 is continuous from front to back, with air entering at the rear end and exiting at the front end. The diameter of the inner wall of the outer ring portion 21 varies by less than 5 mm from back to front. The inner ring portion 22 is coaxially arranged with the outer ring portion 21 and extends radially in a constant manner from back to front. The air outlet component also includes a deflector 5, which is axially disposed between the cylinder 2 and the constriction member 6. The deflector 5 is coaxially arranged with the outer ring portion 21 and is mounted on the front side of the cylinder 2. The deflector 5 includes an outer shell portion 51, an inner shell portion 52, and a plurality of second guide vanes 53 connecting the outer shell portion 51 and the inner shell portion 52. The difference between the diameter of the inner wall of the outer shell portion 51 and the inner wall of the outer ring portion 21 is less than 5 mm.

[0031] In this embodiment, if Figure 2 、 Figure 3 、 Figure 4 and Figure 6 As shown, the inner wall diameter of the outer ring portion 21 remains constant from back to front, and the inner wall diameter of the outer shell portion 51 remains constant from back to front. The inner wall diameter of the outer ring portion 21 is equal to the inner wall diameter of the outer shell portion 51. This arrangement forms a ventilation duct that runs through the front and back, reducing wind energy loss. The inner wall diameters of the outer shell portion 51 and the inner wall diameters of the outer ring portion 21 are 30 to 36 mm. The relatively small diameters of the outer shell portion 51 and the outer ring portion 21 make the portable fan compact and easy to carry.

[0032] In one embodiment, Figure 2 、 Figure 3 、 Figure 4and Figure 6 As shown, the maximum diameter of the contraction surface 61 is equal to the diameter of the inner wall of the outer shell 51, and the minimum diameter of the contraction surface 61 is greater than the maximum diameter of the inner shell 52. The minimum diameter of the contraction surface 61 is 21.05 to 25.05 mm. The inner shell 52 protrudes forward relative to the outer shell 51, and the front end of the inner shell 52 is located radially inward of the contraction surface 61. The front end of the contraction surface 61 is located in front of the front end of the inner shell 52. There is a gap between the outer surface of the inner shell 52 and the contraction surface 61, forming an air duct that gathers and guides wind. The contraction surface 61 has the function of enhancing wind pressure, concentrating strong wind in the middle and then blowing it toward the user, which has a good blowing effect.

[0033] In one embodiment, Figures 2 to 4 As shown, a base plate 221 is provided in the inner ring portion 22, and a hollow shaft barrel 222 extending backward from the base plate 221. The motor 4 includes a stator assembly 41 and a rotor assembly 42. The stator assembly 41, the rotor assembly 42 and the fan 3 are nested and fixed in the shaft barrel 222. The rotor assembly 42 includes a rotating shaft 421, a bearing 422 and a magnetic ring 423. The rotating shaft 421 and the bearing 422 are inserted and fixed in the shaft barrel 222. The stator assembly 41 is provided on the radial outer side of the shaft barrel 222, and the magnetic ring 423 is provided on the radial outer side of the stator assembly 41. The magnetic ring 423 is fixed on the radial inner side of the wheel shell 31. The motor 4 is an outer rotor motor 4, which is in the form of an outer rotor and has a more compact and reasonable structure.

[0034] In one embodiment, Figures 2 to 4 As shown, the axial length of the inner shell 52 is 13-17 mm. The inner shell 52 radially decreases from the back to the front, and has a spherical appearance, guiding the airflow to converge and flow forward. A column 521 is provided at the center of the inner shell 52, and the column 521 is inserted and fixed to the shaft cylinder 222.

[0035] In one embodiment, Figures 2 to 5As shown, the brake assembly is coaxially arranged with the outer ring portion 21. The brake assembly is mounted on the rear side of the inner ring portion 22 and radially housed inside the outer ring portion 21. The brake assembly includes a fan 3 and a motor 4. The fan 3 includes a housing 31 and a plurality of blades 32 spaced apart on the outer surface of the housing 31. The motor 4 is located radially inward of the housing 31. The housing 31 radially increases from rear to front, while the inner ring portion 22 extends radially unchanged from rear to front. The inner housing 52 radially decreases from rear to front. The housing 31 partially draws in and directs air forward, while the inner housing 52 directs and focuses air forward. The maximum diameter of the housing 31 differs from the diameter of the inner ring portion 22 by less than 5 mm, and the maximum diameter of the inner housing 52 also differs from the diameter of the inner ring portion 22 by less than 5 mm. The maximum diameters of the housing 31, the inner housing 52, and the inner ring portion 22 all range from 19.24 to 23.24 mm. That is to say, the maximum diameter of the wheel shell 31, the diameter of the inner ring portion 22 and the maximum diameter of the inner shell portion 52 are slightly different from each other, and there is a smooth transition between the wheel shell 31, the inner ring portion 22 and the inner shell portion 52. The wind can flow smoothly through the outer surface of the wheel shell 31, the outer surface of the inner ring portion 22 and the outer surface of the inner shell portion 52, and the wind energy loss is small.

[0036] In this embodiment, if Figures 2 to 5 As shown, the maximum diameter of the wheel shell 31, the maximum diameter of the inner shell 52, and the diameter of the inner ring 22 are equal, and the spacing between the front end of the wheel shell 31 and the inner ring 22 is 0.5-3 mm, and the spacing between the inner shell 52 and the inner ring 22 is 0.15-1 mm. Wind can flow smoothly from the outer surface of the wheel shell 31 to the outer surface of the inner ring 22, and then to the outer surface of the inner shell 52. Furthermore, the wind pressure is enhanced on the radially enlarged outer surface of the wheel shell 31, wind loss is reduced on the radially unchanged outer surface of the inner ring 22, and wind is concentrated and diverted on the radially reduced inner shell 52, resulting in a very reasonable structural design.

[0037] In one embodiment, Figure 3 、 Figure 4 、 Figure 7 and Figure 8As shown, the wheel shell 31 includes a rear end portion 311, an expansion portion 312 that radially increases from the rear end portion 311 to the front, and a smooth portion 313 that remains radially unchanged from the expansion portion 312 to the front. The slope of the expansion portion 312 decreases continuously from the back to the front. The axial length of the expansion portion 312 is 12.9 to 16.9 mm, and the axial length of the smooth portion 313 is 6.13 to 10.13 mm. The axial length of the expansion portion 312 is longer, which is conducive to enhancing wind pressure; the smooth portion 313 also has a certain axial length, which is conducive to accommodating the motor 4 in the smooth portion 313. The wheel shell 31 also includes a fixing column 314 located at the inner center, and the fixing column 314 is used to fix the rotating shaft 421.

[0038] In one embodiment, Figure 3 、 Figure 4 、 Figure 7 and Figure 8 As shown, each blade 32 includes a blade root 321 connected to the wheel shell 31, a blade top 322 opposite the blade root 321, a leading edge 323 connecting the blade root 321 and the blade top 322, and a trailing edge 324 connecting the blade root 321 and the blade top 322. The leading edge 323 and the trailing edge 324 are arranged opposite each other. The front end of the blade root 321 is located within 1.5 mm before and after the connection between the expanded portion 312 and the smooth portion 313. It can be seen that the blade root 321 is mainly concentrated in the expanded portion 312, and the blades 32 are also mainly concentrated in the expanded portion 312, which is beneficial for the blades 32 to absorb and cut wind, and to increase wind pressure.

[0039] In one embodiment, Figures 3 to 6 As shown, each first guide vane 23 includes a first section 231 and a second section 232 extending rearward from the first section 231. The first section 231 connects both the inner ring portion 22 and the outer ring portion 21, while the second section 232 connects only to the outer ring portion 21. The radially inner side of the second section 232 is spaced apart from the wheel housing 31. The distance between the rear end of the second section 232 and the leading edge portion 323 is 1.25 to 3.25 mm, and the distance between the front end of the first section 231 and the rear end of the second guide vane 53 is 0.4 to 1.4 mm. In other words, the axial spacing between the blades 32 and the first guide vanes 23 is small, and the axial spacing between the first guide vanes 23 and the second guide vanes 53 is small, allowing wind to flow smoothly from between the multiple blades 32 to between the multiple first guide vanes 23, and then to between the multiple second guide vanes 53. In addition, there are gaps between the blade 32 and the first guide vane 23, and between the first guide vane 23 and the second guide vane 53, which are conducive to pressure relief, avoid backflow caused by excessive wind pressure, and reduce wind energy loss.

[0040] In one embodiment, Figures 3 to 6 As shown, from back to front, the blades 32 extend in a clockwise spiral, the second section 232 extends in a counterclockwise spiral, the first section 231 extends straight, and the second guide vanes 53 first extend in a clockwise spiral and then extend straight. It can be seen that the airflow is guided multiple times from back to front, continuously combed and integrated, and finally flows straight forward, resulting in minimal wind energy loss and low noise.

[0041] In one embodiment, Figure 2 、 Figure 4 、 Figure 6 and Figure 7 As shown, the number of blades 32 is 9, the number of first guide vanes 23 is 7, and the number of second guide vanes 53 is 7. It should be understood that when the number of stationary blades and moving blades is similar, the stationary blades can better comb and integrate the airflow generated by the moving blades. The first guide vanes 23 and the second guide vanes 53 are stationary blades, and the blades 32 are moving blades. Multiple first guide vanes 23 and multiple second guide vanes 53 are spaced apart in the radial direction, with the axial projection of one first guide vane 23 located between the axial projections of two adjacent second guide vanes 53. This arrangement, while providing combing effects of the first guide vanes 23 and the second guide vanes 53 in the axial direction, also expands the combing range in the radial direction, further ensuring the combing and integration effect of the stationary blades and achieving better airflow.

[0042] In one embodiment, Figures 3 to 5 As shown, the ratio of the axial length of the blade 32 to the axial length of the first guide vane 23 ranges from 7:8 to 11:12, and the ratio of the axial length of the first guide vane 23 to the axial length of the second guide vane 53 ranges from 12:7 to 8:3. It can be seen that the axial length of the blade 32 is close to that of the first guide vane 23, while the axial length of the first guide vane 23 is slightly longer than that of the blade 32, which immediately combs the airflow generated by the blade 32. The axial length of the first guide vane 23 is approximately twice that of the second guide vane 53. After being combed by the first guide vane 23, the airflow tends to be stable, eliminating the need for excessively long guide vanes. Therefore, the axial length of the second guide vane 53 is shorter, which helps reduce wind energy loss and improves the airflow effect.

[0043] In one embodiment, Figure 2 、 Figure 3 、 Figure 5 and Figure 6As shown, the invention also includes a soft shell 7. The soft shell 7 is disposed within the shell 1 and covers the outer sides of the barrel 2, the flow guide 5, and the contraction member 6. The soft shell 7 includes an annular portion 71, and a front edging portion 72 and a rear edging portion 73 connecting the front and rear ends of the annular portion 71. The annular portion 71 covers the radially outer sides of the outer ring portion 21, the outer shell portion 51, and the contraction member 6. The front edging portion 72 is disposed at the front end of the contraction member 6, and its edge is flush with the front end of the contraction surface 61. The rear edging portion 73 is disposed at the rear end of the outer ring portion 21, and its edge is flush with the rear end of the inner wall of the outer ring portion 21. The soft shell 7 provides a cushioning and shock-absorbing function and can better secure the barrel 2, the flow guide 5, and the contraction member 6 within the outer shell. The radially outer side of the soft shell 7 may be provided with convex bumps or ribs to enhance the securement. The radial inner side and / or radial outer side of the soft shell 7 may also be provided with recesses to enhance the buffering and shock absorbing effect.

[0044] In one embodiment, Figure 2 、 Figure 3 and Figure 5 As shown, it also includes a front guide 8, a rear guide 9 and an air inlet net 10. The front guide 8 is embedded in the front end of the shell 1, and the rear end of the front guide 8 is against the front edging portion 72. The front guide 8 includes a front guide surface 81 located on the inner side, and the front guide surface 81 radially increases from the back to the front, and the rear end of the front guide surface 81 is flush with the edge of the front edging portion 72. The rear guide 9 is embedded in the rear end of the shell 1, and the front end of the rear guide 9 and the rear edging portion 73 are clamped to fix the air inlet net 10. The rear guide 9 includes a rear guide surface 91 located on the inner side, and the front end of the rear guide surface 91 is flush with the edge of the rear edging portion 73. The wind converges from the radially shrinking rear guide surface 91 into the shell 1, and the wind pressure, wind force and wind effect are enhanced in the shell 1, and finally expands and flows out from the radially expanding front guide surface 81, and the wind outlet effect is good. The air inlet net 10 is densely covered with a plurality of air inlet micropores (not numbered, the same below). The air inlet micropores can be circular or hexagonal. The aperture of the air inlet micropores is small, which is conducive to isolating dust and impurities and blowing out good air.

[0045] In one embodiment, Figures 2 to 5As shown, the axial length of the shell 1 is 61 to 65 mm, and the axial length of the shell 1, the front guide 8, and the rear guide 9 when installed is 66 to 70 mm. In other words, the overall axial length is not very long, the overall volume is compact, and it is easy to carry. The axial length of the soft shell 7 is 54.5 to 58.5 mm, and the axial length from the rear end of the outer ring portion 21 to the front end of the contraction member 6 is 43.5 to 47.5 mm. The soft shell 7 can well protect the cylinder 2, the guide member 5, and the contraction member 6. The distance from the rear end of the wheel shell 31 to the rear end of the rear guide 9 is 3.8 to 7.8 mm, and the distance from the front end of the inner shell portion 52 to the front end of the front guide 8 is 14.75 to 18.75 mm, which is conducive to gathering wind and enhancing wind force.

[0046] It should be understood that the "unchanged diameter" and "equal diameters" mentioned in this application allow for a certain error range and do not require complete and exact equality.

[0047] 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, characterized in that: include: case; An air outlet component is housed in the shell, and the air outlet component includes a cylinder and a brake assembly housed in the cylinder. The brake assembly includes a fan and a motor. The fan includes a plurality of blades. The motor includes a plurality of first guide vanes. The first guide vane includes a first section and a second section connected thereto. The blade extends in a clockwise spiral, and the second section extends in a counterclockwise spiral.

2. The portable fan according to claim 1, wherein: The second section is closer to the blade than the first section.

3. The portable fan according to claim 1, wherein: The blade extends in a direction toward the first guide vane adjacent to the blade.

4. The portable fan according to claim 3, wherein: The blade extends in a direction toward the second section of the first guide vane adjacent to the blade.

5. The portable fan according to claim 1, wherein: The axial length of the first guide vane is slightly longer than the axial length of the blade.

6. The portable fan according to claim 1, wherein: The first section extends straight.

7. The portable fan according to claim 1, wherein: The fan also includes a wheel shell, and the multiple blades are arranged at intervals on the outer surface of the wheel shell. The wheel shell includes a rear end portion and an enlarged portion connected to the rear end portion, and a smooth portion connected to the enlarged portion. As the rear end portion moves toward the smooth portion, the diameter of the enlarged portion increases from small to large, while the diameter of the smooth portion remains unchanged.

8. The portable fan according to claim 7, wherein: An axial length of the expanded portion is greater than an axial length of the smooth portion.

9. The portable fan according to claim 7, wherein: The portion of the blade provided on the expanded portion is larger than the portion of the blade provided on the smooth portion.

10. The portable fan according to claim 1, wherein: The cylinder includes an outer ring portion and an inner ring portion, the first guide vane is connected to the outer ring portion and the inner ring portion, and the fan also includes a wheel shell, the maximum diameter of the wheel shell is equal to the diameter of the inner ring portion.

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