Portable fan

Abstract

The utility model 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 that cools the body.

[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 air volume and wind pressure blown axially to the user are small, the air outlet effect is poor, and the user's needs for blowing air for cooling are not met well. Summary of the invention

[0004] In view of this, the present application provides a portable fan, including: a shell, which is through-through from front to back, with air entering from the back and air exiting from the front; an air outlet component, which is accommodated in the shell, and the air outlet component includes 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 includes a contraction surface located on the inside, which is arranged toward the air duct, and the contraction surface radially shrinks from the back to the front. By arranging the contraction component, and the contraction component has a 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 derived from the air outlet component, enhance the wind pressure, and increase the wind force.

[0005] The present application provides a portable fan, comprising: a shell, which is connected from front to back, with air entering from the rear side and exiting from the front side; an air outlet component accommodated in the shell, the air outlet component comprising a cylinder and a brake assembly accommodated in the cylinder, the brake assembly being used to generate wind; a contraction component accommodated in the shell and arranged on the front side of the air outlet component, the contraction component comprising a contraction surface located on the inner side, the contraction surface being 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, 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 shrinkage surface is equal to the diameter of the inner wall of the outer shell portion, the minimum diameter of the shrinkage surface is greater than the maximum diameter of the inner shell portion, and the minimum diameter of the shrinkage 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 outer sides 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 connecting the front and rear ends of the annular portion. The annular portion covers the radial outer side 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 61-65 mm, the axial length of the shell, the front guide and the rear guide when installed is 66-70 mm, the axial length of the soft shell is 54.5-58.5 mm, the axial length from the rear end of the outer ring portion to the front end of the shrinkage portion is 46.8-50.5 mm, the axial length from the rear end of the wheel shell to the front end of the inner shell portion is 43.5-47.5 mm, the distance from the rear end of the wheel shell to the rear end of the rear guide is 3.8-7.8 mm, and the distance from the front end of the inner shell portion to the front end of the front guide portion is 14.75-18.75 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 plurality of the first guide vanes and the plurality of the second guide vanes are spaced apart in the radial direction, and the axial projection of one of the first guide vanes 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 only connects 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 three-dimensional diagram 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 view of the portable fan of the present application from the side;

[0019] Figure 4 is a side cross-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 cross-sectional view of the portable fan of the present application from the rear;

[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 functions of the present application, the present 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 may be directly connected to the other element or there may be an intermediate 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 the present 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 and are only for the convenience of describing the present 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 the present application.

[0028] In one embodiment, Figure 1 As shown, a portable fan 1 is shown. In this embodiment, the portable fan 1 is a handheld fan, so the portable fan 1 includes a handheld part (not numbered, the same below), a circuit board and a battery (not numbered, the same below) are arranged in the handheld part, the circuit board is used to control the circuit, and the battery is used to supply power. In other embodiments, the portable fan 1 can 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 air exiting 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, and the brake assembly includes a fan 3 and a motor 4, and the motor 4 drives the fan 3 to rotate to 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, and 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 arranged, 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 through-connected from front to back, with air entering from the rear end and air exiting from the front end. The diameter of the inner wall of the outer ring portion 21 changes from back to front by less than 5 mm. The inner ring portion 22 is coaxially arranged with the outer ring portion 21, and the inner ring portion 22 extends radially unchanged from back to front. The air outlet component also includes a guide member 5, which is axially arranged between the cylinder 2 and the contraction member 6, and the guide member 5 is coaxially arranged with the outer ring portion 21, and the guide member 5 is installed on the front side of the cylinder 2. The guide member 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 diameter of 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 diameter of the inner wall of the outer ring portion 21 does not change from back to front, and the diameter of the inner wall of the outer shell portion 51 does not change from back to front, and the diameter of the inner wall of the outer ring portion 21 is equal to the diameter of the inner wall of the outer shell portion 51. In this way, a ventilation duct that passes through the front and back can be formed to reduce wind energy loss. The diameter of the inner wall of the outer shell portion 51 and the diameter of the inner wall of the outer ring portion 21 are 30 to 36 mm. The diameters of the outer shell portion 51 and the outer ring portion 21 are small, and the overall size of the portable fan is small 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, and the minimum diameter of the contraction surface 61 is 21.05-25.05 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, and 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 for gathering and guiding wind. And the contraction surface 61 has the function of enhancing wind pressure, concentrating strong wind in the middle and then blowing it to the user, and the blowing effect is good.

[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 cylinder 222 extending backward from the base plate 221. The motor 4 includes a stator assembly 41 and a rotor assembly 42, and the stator assembly 41, the rotor assembly 42 and the fan 3 are nested and fixed in the shaft cylinder 222. The rotor assembly 42 includes a rotating shaft 421, a bearing 422 and a magnetic ring 423, and the rotating shaft 421 and the bearing 422 are inserted and fixed in the shaft cylinder 222, the stator assembly 41 is provided on the radial outer side of the shaft cylinder 222, the magnetic ring 423 is provided on the radial outer side of the stator assembly 41, and 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, in the form of an outer rotor, and the structure is more compact and reasonable.

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

[0035] In one embodiment, Figures 2 to 5As shown, the brake assembly is coaxially arranged with the outer ring portion 21, and the brake assembly is installed on the rear side of the inner ring portion 22 and is radially accommodated on the inner side of the outer ring portion 21. The brake assembly includes a fan 3 and a motor 4, and the fan 3 includes a wheel shell 31 and a plurality of blades 32 arranged at intervals on the outer surface of the wheel shell 31, and the motor 4 is arranged on the radial inner side of the wheel shell 31. The wheel shell 31 radially increases from back to front, the inner ring portion 22 extends radially unchanged from back to front, and the inner shell portion 52 radially decreases from back to front. The wheel shell 31 partially absorbs wind and guides the flow forward, and the inner shell portion 52 guides and gathers wind forward. The maximum diameter of the wheel shell 31 and the diameter of the inner ring portion 22 differ by less than 5 mm, and the maximum diameter of the inner shell portion 52 and the diameter of the inner ring portion 22 differ by less than 5 mm. The maximum diameter of the wheel shell 31, the maximum diameter of the inner shell portion 52 and the diameter of the inner ring portion 22 are all in the range of 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 0.5-3mm, and the spacing between the inner shell 52 and the inner ring 22 is 0.15-1mm, so that the wind flow can smoothly flow from the outer surface of the wheel shell 31 to the outer surface of the inner ring 22, and then smoothly flow to the outer surface of the inner shell 52. In addition, the wind pressure is enhanced on the radially enlarged outer surface of the wheel shell 31, the wind loss is reduced on the radially unchanged outer surface of the inner ring 22, and the radially reduced inner shell 52 gathers wind and guides the flow, and the structural design is very reasonable.

[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 enlarged portion 312 that radially increases from the rear end portion 311 to the front, and a smooth portion 313 that remains unchanged radially from the enlarged portion 312 to the front. The slope of the enlarged portion 312 decreases continuously from the back to the front, the axial length of the enlarged 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 enlarged portion 312 is relatively long, 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 to 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, and the leading edge 323 and the trailing edge 324 are arranged opposite to each other. The front end of the blade root 321 is arranged within the range of 1.5 mm before and after the connection between the enlarged portion 312 and the smooth portion 313. It can be known that the blade root 321 is mainly concentrated in the enlarged portion 312, and the blade 32 is also mainly concentrated in the enlarged portion 312, which is beneficial to the blade 32 to absorb and cut wind, and to enhance wind pressure.

[0039] In one embodiment, Figures 3 to 6 As shown, each of the first guide vanes 23 includes a first section 231 and a second section 232 extending backward from the first section 231. The first section 231 connects the inner ring portion 22 and the outer ring portion 21 at the same time, and the second section 232 only connects the outer ring portion 21. The radial inner side of the second section 232 is spaced from the wheel shell 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 distance between the blade 32 and the first guide vane 23 is small, and the axial distance between the first guide vane 23 and the second guide vane 53 is small, so that the wind can flow smoothly from multiple blades 32 to multiple first guide vanes 23, and then smoothly flow to 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 and avoid backflow caused by excessive wind pressure, thereby reducing wind energy loss.

[0040] In one embodiment, Figures 3 to 6 As shown, from back to front, the blade 32 extends in a clockwise spiral, the second section 232 extends in a counterclockwise spiral, the first section 231 extends straight, and the second guide vane 53 first extends in a clockwise spiral and then extends 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, with little wind energy loss and less noise.

[0041] In one embodiment, Figure 2 , Figure 4 , Figure 6 and Figure 7 As shown, the number of the blades 32 is 9, the number of the first guide vanes 23 is 7, and the number of the second guide vanes 53 is 7. It should be understood that when the number of the stationary blades and the 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 belong to the stationary blades, and the blades 32 belong to the moving blades. A plurality of the first guide vanes 23 and a plurality of the second guide vanes 53 are arranged at intervals in the radial direction, and the axial projection of one of the first guide vanes 23 is located between the axial projections of two adjacent second guide vanes 53. In this way, on the basis of combing the first guide vanes 23 and the second guide vanes 53 in the axial direction, the combing range is also expanded in the radial direction, which can further ensure the combing and integration effect of the stationary blades and achieve a better air outlet effect.

[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 is in the range of 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 is in the range of 12:7 to 8:3. It can be seen that the axial length of the blade 32 is close to the axial length of the first guide vane 23, and the axial length of the first guide vane 23 is slightly longer than the axial length of the blade 32, combing the airflow generated by the blade 32 at the first time. The axial length of the first guide vane 23 is about twice the axial length of the second guide vane 53. After being combed by the first guide vane 23, the airflow tends to be stable and does not require too long flow guidance. Therefore, the axial length of the second guide vane 53 is shorter, which is conducive to reducing wind energy loss and having a good wind output effect.

[0043] In one embodiment, Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, it also includes a soft shell 7. The soft shell 7 is arranged in the shell 1, and the soft shell 7 is coated on the outside of the cylinder 2, the guide member 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 respectively connecting the front and rear ends of the annular portion 71. The annular portion 71 is coated on the radial outer side of the outer ring portion 21, the outer shell portion 51 and the contraction member 6. The front edging portion 72 is arranged at the front end of the contraction member 6, and the edge of the front edging portion 72 is flush with the front end of the contraction surface 61. The rear edging portion 73 is arranged at the rear end of the outer ring portion 21, and the edge of the rear edging portion 73 is flush with the rear end of the inner wall of the outer ring portion 21. The soft shell 7 has the function of buffering and shock absorption, and can better fix the cylinder 2, the guide member 5 and the contraction member 6 in the outer shell. A convex hull or a convex rib can be provided on the radial outer side of the soft shell 7 to strengthen the fixing effect. The radial inner side and / or radial outer side of the soft shell 7 may also be provided with depressions 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 edge 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 edge 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 edge 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 edge portion 73. The wind converges from the radially reduced 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 expanded 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), and the air inlet micropores may be circular or hexagonal, and the aperture of the air inlet micropores is relatively 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 61-65 mm, and the axial length of the shell 1, the front guide 8 and the rear guide 9 after installation is 66-70 mm, that is, the overall axial length will not be very long, the overall volume is small, and it is easy to carry. The axial length of the soft shell 7 is 54.5-58.5 mm, and the axial length from the rear end of the outer ring part 21 to the front end of the contraction part 6 is 43.5-47.5 mm. The soft shell 7 can well protect the cylinder 2, the guide part 5 and the contraction part 6. The distance from the rear end of the wheel shell 31 to the rear end of the rear guide 9 is 3.8-7.8 mm, and the distance from the front end of the inner shell part 52 to the front end of the front guide 8 is 14.75-18.75 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 the present application allow for a certain error range and do not require complete and exact equality.

[0047] The above detailed description is only an explanation 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 creation are included in the patent scope of this creation.

Claims

1. A portable fan, characterized in that: include: The shell is connected from front to back, with air entering from the rear and exiting from the front; An air outlet component is accommodated in the housing, the air outlet component comprises a cylinder and a brake assembly accommodated in the cylinder, and the brake assembly is used to generate wind; The shrinking member is accommodated in the shell and arranged on the front side of the air outlet component. The shrinking member includes a shrinking surface located on the inner side. The shrinking surface is arranged toward the air duct and radially shrinks from the back to the front.

2. The portable fan according to claim 1, characterized in that: The cylinder body 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 body 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, 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.

3. The portable fan according to claim 2, characterized in that: 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 outer side of the wheel shell, and the motor is accommodated on the inner side of the wheel shell; the wheel shell increases radially from back to front, the inner ring portion extends radially unchanged from back to front, and the inner shell portion decreases radially from back to front, the maximum diameter of the wheel shell and the diameter of the inner ring portion differ by less than 5mm, the maximum diameter of the inner shell portion and the diameter of the inner ring portion differ by less than 5mm, 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 23.24mm; the spacing between the front end of the wheel shell and the inner ring portion is 0.5 to 3mm, and the spacing between the inner shell portion and the inner ring portion is 0.15 to 1mm.

4. The portable fan according to claim 3, characterized in that: The maximum diameter of the contraction surface is equal to the diameter of the inner wall of the outer shell portion, the minimum diameter of the contraction surface is greater than the maximum diameter of the inner shell portion, and the minimum diameter of the contraction surface is 21.05-25.05 mm.

5. The portable fan according to claim 4, characterized in that: 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.

6. The portable fan according to claim 3, characterized in that: It also includes a soft shell, which is arranged in the shell body and covers the outer sides 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 connecting the front and rear ends of the annular portion. The annular portion covers the radial outer side 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.

7. The portable fan according to claim 6, characterized in that: 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.

8. The portable fan according to claim 7, characterized in that: The axial length of the shell is 61-65 mm, the axial length of the shell, the front guide and the rear guide when installed is 66-70 mm, the axial length of the soft shell is 54.5-58.5 mm, the axial length from the rear end of the outer ring portion to the front end of the contraction portion is 46.8-50.5 mm, the axial length from the rear end of the wheel shell to the front end of the inner shell portion is 43.5-47.5 mm, the distance from the rear end of the wheel shell to the rear end of the rear guide is 3.8-7.8 mm, and the distance from the front end of the inner shell portion to the front end of the front guide portion is 14.75-18.75 mm.

9. The portable fan according to claim 3, characterized in that: 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 plurality of the first guide vanes and the plurality of the second guide vanes are spaced apart in the radial direction, and the axial projection of one of the first guide vanes 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.

10. The portable fan according to claim 3, characterized in that: 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 only connects 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.

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