Air outlet structure and portable fan

Abstract

The present application provides an air outlet structure, which is applied to a portable fan, comprising: a shell, which is connected from front to back, with air entering at the rear end and air exiting at the front end; a fan unit, which is accommodated in the shell and blows air toward the front end; wherein the fan unit comprises: at least two static fans, which are fixed in the shell; at least two rotating shafts, which are axially arranged, and each rotating shaft is correspondingly fixed to the center of a static fan; at least two moving fans, which are located on the same axis, and each moving fan is correspondingly fixed on a rotating shaft, and the rotating shaft drives the moving fans to rotate, and at least two moving fans both blow air forward, and at least two moving fans are provided to provide greater wind pressure and air volume; wherein each of the at least two static fans and the at least two moving fans comprises a wheel shell, and a plurality of blades which are arranged at intervals around the outer side surface of the wheel shell, and the maximum diameter of the wheel shell of any static fan differs from the maximum diameter of the wheel shell of any moving fan by less than 5 mm, so the wind resistance is smaller and the air outlet effect is good.

Description

Technical Field

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

[0002] Fans can be divided into axial flow fans, cross-flow fans, centrifugal fans and other types of fans according to the different ways of air discharge. Among them, when the axial flow fan is working, the blades rotate to make the air flow axially. However, for increasingly portable small and medium-sized fans, such as desktop fans, clip fans, handheld fans, neck hanging fans, etc., axial flow fans have low wind pressure and low wind efficiency, and users have a poor blowing experience.

[0003] How to improve the wind pressure and wind efficiency of small and medium-sized fans with limited volume, and how to reduce wind resistance, noise and vibration are urgent issues to be addressed. Summary of the invention

[0004] In view of this, the present application provides an air outlet structure, which provides a greater wind pressure and air volume at the same speed by setting at least two moving fans. In addition, the maximum diameter of the wheel shell of any moving fan is slightly different from the maximum diameter of the wheel shell of any static fan, the wind resistance is small, the airflow can flow out smoothly, and the air outlet effect is good.

[0005] The present application provides an air outlet structure, which is applied to a portable fan, comprising: a shell, which is connected from front to back, with air inlet at the rear end and air outlet at the front end; a fan unit, which is accommodated in the shell and blows air toward the front end; wherein the fan unit comprises: at least two static fans, which are fixed in the shell; at least two rotating shafts, which are axially arranged, and each of the rotating shafts is correspondingly fixed to the center of one of the static fans; at least two moving fans, which are located on the same axis, and each of the moving fans is correspondingly fixed on one of the rotating shafts, and the rotating shaft drives the moving fans to rotate, and at least two of the moving fans blow air forward; wherein each of the at least two static fans and the at least two moving fans comprises a wheel shell, and a plurality of blades which are spaced and arranged around the outer side surface of the wheel shell, and the maximum diameter of the wheel shell of any one of the static fans differs from the maximum diameter of the wheel shell of any one of the moving fans by less than 5 mm.

[0006] The fan unit includes at least two motors, each of which is fixed to one of the rotating shafts and is accommodated in one of the static fans and / or one of the dynamic fans. Each of the dynamic fans is driven by one of the motors, and the ratio of the maximum diameter of the wheel shell of the static fan to the total diameter of the static fan is 0.15 to 0.8.

[0007] The fan unit includes two static fans and two dynamic fans, the two static fans are arranged between the two dynamic fans, and the two dynamic fans rotate in opposite directions; or the static fans and the dynamic fans are arranged alternately, and the two dynamic fans rotate in the same direction.

[0008] When the two static fans are arranged between the two dynamic fans, the static fan on the rear side is the first static fan, which includes a first static wheel shell and a plurality of first static blades; the static fan on the front side is the second static fan, which includes a second static wheel shell and a plurality of second static blades; the diameters of the first static wheel shell and the second static wheel shell are both axially unchanged; the first static wheel shell and the second static wheel shell are closely arranged; and the first static blade and the second static blade are spaced 0.2 to 1 mm apart.

[0009] When the two static fans are arranged between the two moving fans, the moving fan on the rear side is the first moving fan, and the moving fan on the front side is the second moving fan, the first moving fan includes a first moving wheel shell and a plurality of first moving blades, and the second moving fan includes a second moving wheel shell and a plurality of second moving blades, the first moving wheel shell opens forward, and the second moving wheel shell opens backward.

[0010] The first impeller shell includes an end portion, an enlarged portion, and a smooth portion connected in sequence front and back, and the second impeller shell includes a smooth portion, an enlarged portion, and an end portion connected in sequence front and back, the diameter of the end portion is smaller than the diameter of the smooth portion, and the diameter of the enlarged portion tends to increase from the end portion to the smooth portion.

[0011] A plurality of the first moving blades are connected to the smooth portion and the enlarged portion, or a plurality of the first moving blades are connected to the smooth portion; a plurality of the second moving blades are connected to the smooth portion and the enlarged portion, or a plurality of the second moving blades are connected to the smooth portion; the diameter of the end portion is 12.3 to 16.3 mm, the diameter of the smooth portion is 19.24 to 23.24 mm, and the axial lengths of the first moving wheel shell and the second moving wheel shell are both 15 to 19 mm.

[0012] The leading edge and the trailing edge of the first moving blade are both straight lines, the first moving blade is radially twisted and bent from the blade root to the blade top, the blade root of the first moving blade is inclined and extends from the back to the front, the angle between the connecting line of the front and rear ends of the blade root of the first moving blade and the axial direction is 30 to 80°, the angle between the connecting line of the front and rear ends of the blade root of the first moving blade and the connecting line of the front and rear ends of the blade top of the first moving blade is 5 to 25°, a plurality of the second moving blades and a plurality of the first moving blades are axially symmetrically arranged; the blade roots of the first stationary blade and the second stationary blade extend axially straight forward.

[0013] The axial spacing between the first moving wheel shell and the first stationary wheel shell is 0.5 to 3.5 mm, the axial spacing between the second stationary wheel shell and the second moving wheel shell is 0.5 to 3.5 mm, the axial spacing between the first moving blade and the first stationary blade is 3 to 6.2 mm, and the axial spacing between the second stationary blade and the second moving blade is 3 to 6.2 mm; the radial spacing between the top of the first moving blade and the shell is 0.5 to 3.5 mm, and the radial spacing between the top of the second moving blade and the shell is 0.5 to 3.5 mm.

[0014] The present application also provides a portable fan, comprising the above-mentioned air outlet structure, wherein the portable fan is any one of a desktop fan, a clip fan, a handheld fan, and a neck hanging fan.

[0015] Compared with the prior art, the air outlet structure and portable fan of the present application have the following beneficial effects: by providing at least two moving fans, a greater wind pressure and air volume can be provided at the same speed. Moreover, the maximum diameter of the wheel shell of any moving fan is slightly different from the maximum diameter of the wheel shell of any static fan, the wind resistance is small, the airflow can flow out smoothly forward, and the air outlet effect is good. 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 It is an exploded view of the housing and the static fan of the present application;

[0019] Figure 4 is a schematic diagram of the second moving fan of the present application;

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

[0021] Figure 6 is another cross-sectional view of the portable fan of the present application from the side;

[0022] Figure 7 It is a cross-sectional view of the portable fan of the present application from the rear. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] In one embodiment, Figure 1 , Figure 2 and Figure 5 As shown, a portable fan is shown. The portable fan comprises an air outlet structure 100 and a bracket 6. The air outlet structure 100 is arranged on the bracket 6. A power supply 7 is arranged in the bracket 6. In this embodiment, the portable fan is a handheld fan. In other embodiments, the portable fan can also be a clip fan, a desktop fan, a neck hanging fan or other portable fans.

[0028] In one embodiment, Figure 2 , Figure 3 and Figure 5 As shown, the air outlet structure 100 includes a shell 1 and a fan unit accommodated in the shell 1. The shell 1 is connected from front to back, and air enters the rear end of the shell 1 and exits the front end. The power supply 7 supplies power to the fan unit, and the fan unit is driven to generate wind and blow the wind toward the front end. It should be understood that in other embodiments, the shell 1 can also be provided with an air inlet area. In addition, a buffer (unnumbered) is provided on the outside of the shell 1, and a shell (unnumbered, the same below) is provided on the outside of the buffer, and the shell is fixed to the bracket 6.

[0029] In one embodiment, Figure 2 , Figure 3 and Figure 5As shown, the fan unit includes at least two static fans, at least two dynamic fans and at least two rotating shafts 4, wherein the static fans are fixed in the housing 1, and the dynamic fans rotate around the rotating shafts 4 to generate wind. At least two of the rotating shafts 4 are axially arranged, and each of the rotating shafts 4 is correspondingly fixed to the center of one of the static fans. At least two of the dynamic fans are located on the same axis, and each of the dynamic fans is correspondingly fixed on one of the rotating shafts 4, and the rotating shaft 4 drives the dynamic fans to rotate, and at least two of the dynamic fans blow air forward. By arranging at least two of the dynamic fans, at the same speed, at least two of the dynamic fans provide greater wind pressure and air volume than a single dynamic fan. The fan unit also includes at least two motors 5, each of the motors 5 is correspondingly fixed to one of the rotating shafts 4, and is correspondingly accommodated in one of the static fans and / or one of the dynamic fans. In this embodiment, the motor 5 is basically accommodated in the dynamic fan. Each of the moving fans is driven by a corresponding motor 5. Under the same air volume and air pressure requirements, the rotation speed of at least two moving fans can be lower than that of a single moving fan. The lower rotation speed can reduce the difficulty of the manufacturing process and the production cost of the motor 5, and at the same time reduce the noise of the motor 5. It can be known that the static fan, the rotating shaft 4, the moving fan and the motor 5 are in a one-to-one correspondence. In this embodiment, the motor 5 is a single-phase motor. Of course, in other embodiments, the motor 5 can also be a three-phase motor. The working voltage range provided by the motor 5 is 2 to 16.8V. Preferably, the working voltage range provided by the motor 5 is 2 to 4.2V.

[0030] In one embodiment, Figures 2 to 5 As shown, each of at least two of the static fans and at least two of the dynamic fans includes a wheel shell, and a plurality of blades arranged at intervals around the outer side of the wheel shell. The maximum diameter of the wheel shell of any static fan differs from the maximum diameter of the wheel shell of any dynamic fan by less than 5 mm, that is, the wheel shell of the static fan is similar to the wheel shell of the dynamic fan in diameter, and the wind generated by the rotation of the blades of the dynamic fan receives less wind resistance generated by the static fan, and the wind outlet effect is good. The ratio of the maximum diameter of the wheel shell of the static fan to the total diameter of the static fan is 0.15 to 0.8. It should be understood that when the portable fan is a slightly larger fan such as a desktop fan or a clip fan, the ratio of the maximum diameter of the wheel shell of the static fan to the total diameter of the static fan is relatively small; when the portable fan is a slightly smaller fan such as a handheld fan or a neck hanging fan, the ratio of the maximum diameter of the wheel shell of the static fan to the total diameter of the static fan is relatively large. This mainly depends on the overall volume and air outlet area of ​​the portable fan.

[0031] In one embodiment, Figures 2 to 5As shown, the fan unit includes two static fans and two dynamic fans, the two static fans are arranged between the two dynamic fans, and the two dynamic fans rotate in opposite directions. Of course, in other embodiments, the static fans and the dynamic fans can be arranged alternately, and the rotation directions of the two dynamic fans can also be the same. In addition, the number of the static fans and the number of the dynamic fans are not limited to this.

[0032] In one embodiment, Figures 2 to 5 As shown, the fan unit includes two static fans and two moving fans, and the two static fans are arranged between the two moving fans. The static fan on the rear side is the first static fan 3a, and the first static fan 3a includes a first static wheel shell 31a and a plurality of first static blades 32a. The static fan on the front side is the second static fan 3b, and the second static fan 3b includes a second static wheel shell 31b and a plurality of second static blades 32b. The diameters of the first static wheel shell 31a and the second static wheel shell 31b are both axially unchanged, the first static wheel shell 31a and the second static wheel shell 31b are arranged in a close relationship, and the first static blade 32a and the second static blade 32b are spaced 0.2 to 1 mm apart. In this embodiment, the housing 1 is formed into two parts that are separately molded and the two parts are arranged in a close relationship. In other embodiments, the housing 1 as a whole can also be integrally molded. In this embodiment, the first static fan 3a is integrally molded with a part of the housing 1, and the first static blade 32a is directly connected to a part of the housing 1. The second static fan 3b is integrally formed with another part of the housing 1, and the second static blade 32b is directly connected to the other part of the housing 1. In other embodiments, the first static fan 3a and a part of the housing 1 may also be formed separately, and the first static blade 32a is fixed to a part of the housing 1 by means of threads, clamping, etc.; the second static fan 3b and another part of the housing 1 may also be formed separately, and the second static blade 32b is fixed to another part of the housing 1 by means of threads, clamping, etc. A support structure 311 is provided on the inner side of the first static wheel housing 31a and the inner side of the second static wheel housing 31b, and the rotating shaft 4 and the motor 5 are fixed to the support structure 311 accordingly.

[0033] In one embodiment, Figures 2 to 5As shown, the fan unit includes two static fans and two dynamic fans, and the two static fans are arranged between the two dynamic fans. The dynamic fan on the rear side is the first dynamic fan 2a, and the dynamic fan on the front side is the second dynamic fan 2b. The first dynamic fan 2a includes a first moving wheel shell 21a and a plurality of first moving blades 22a, and the second moving fan 2b includes a second moving wheel shell 21b and a plurality of second moving blades 22b. The first moving wheel shell 21a opens forward, and the second moving wheel shell 21b opens backward. The first moving wheel shell 21a and the second moving wheel shell 21b have openings facing each other, and are both arranged toward the inside of the housing 1, which is conducive to forming a safe environment for the motor 5. The first moving wheel shell 21a includes an end 211, an enlarged portion 212, and a smooth portion 213 connected in sequence front and back, and the second moving wheel shell 21b includes a smooth portion 213, an enlarged portion 212, and an end 211 connected in sequence front and back. The diameter of the end portion 211 is smaller than the diameter of the smooth portion 213, and the diameter of the enlarged portion 212 increases from the end portion 211 to the smooth portion 213, that is, the enlarged portion 212 of the first moving fan 2a increases radially from back to front, and the enlarged portion 212 of the second moving fan 2b decreases radially from back to front. In this embodiment, the diameter of the end portion 211 is 12.3 to 16.3 mm, the diameter of the smooth portion 213 is 19.24 to 23.24 mm, the axial length of the smooth portion 213 is 6.1 to 10.1 mm, and the axial lengths of the first moving wheel shell 21a and the second moving wheel shell 21b are both 15 to 19 mm. A plurality of the first moving blades 22a are connected to the smooth portion 213 and the enlarged portion 212, and a plurality of the second moving blades 22b are connected to the smooth portion 213 and the enlarged portion 212. The diameter of the smooth portion 213 is the maximum diameter of the first impeller shell 21a and the second impeller shell 21b, and the axial length of the smooth portion 213 accounts for a large proportion of the axial length of the first impeller shell 21a and the second impeller shell 21b. Therefore, the plurality of the first moving blades 22a and the second moving blades 22b are arranged on the smooth portion 213 and the enlarged portion 212, which can better cut and deliver the wind. In addition, the airflow from back to front sequentially passes through the end portion 211, the enlarged portion 212, the smooth portion 213, the smooth portion 213, the enlarged portion 212, and the end portion 211. The airflow is first pressurized, then flows smoothly forward, and finally converges and is exported. The structural design is reasonable. In other embodiments, a plurality of the first moving blades 22 a may be connected to the smooth portion 213 , and a plurality of the second moving blades 22 b may be connected to the smooth portion 213 .

[0034] In one embodiment, Figures 3 to 6As shown, the front side of the blade is the leading edge, the rear side is the trailing edge, the leading edge and the trailing edge and the wheel shell are connected to the blade root, and the leading edge and the trailing edge and opposite to the blade root are connected to the blade top. The leading edge and the trailing edge of the first moving blade 22a are both straight lines, and the first moving blade 22a extends radially from the blade root to the blade top, twisting and bending. Such a setting can increase the wind pressure and improve the wind volume. The blade root of the first moving blade 22a extends obliquely from the back to the front, the blade roots of the first stationary blade 32a and the second stationary blade 32b extend straight forward axially, and the second moving blade 22b extends obliquely from the back to the front. In this embodiment, the extension direction of the blade root of the first moving blade 22a is opposite to the extension direction of the blade root of the second moving blade 22b, and the blade roots of the first stationary blade 32a and the second stationary blade 32b extend straight, so that the second moving blade 22b directly combs the airflow of the first moving blade 22a, and there is a transition between the first stationary blade 32a and the second stationary blade 32b, which can reduce wind resistance and noise.

[0035] In one embodiment, when the static fans and the dynamic fans are alternately arranged and the two dynamic fans rotate in the same direction, the blade root of the first dynamic blade 22a extends obliquely from the back to the front, and the second dynamic blade 22b extends obliquely from the back to the front, the first dynamic blade 22a and the second dynamic blade 22b rotate in the same direction, and the extension direction of the blade root of the first dynamic blade 22a and the extension direction of the blade root of the second dynamic blade 22b are the same.

[0036] In one embodiment, Figures 3 to 6 As shown, the angle between the connecting line of the front and rear ends of the blade root of the first moving blade 22a and the axial direction is 30-80°. The larger the angle, the greater the pressure between the front and rear surfaces of the blade, and the greater the wind pressure at the same speed. However, if the pressure on the rear surface is too large, backflow may occur, which will reduce the fan performance. Therefore, the preferred angle range is 30-80°. The angle between the connecting line of the front and rear ends of the blade root of the first moving blade 22a and the connecting line of the front and rear ends of the blade top of the first moving blade 22a is 5-25°. This angle also reflects the curvature of the blade. The larger the angle, the greater the kinetic energy of the gas at the same speed, the greater the wind volume and wind pressure, but the greater the resistance of the blade, and the greater the torque required of the motor 5. Therefore, the preferred range is 5-25°, which can increase the wind pressure and wind volume. The second moving blade 22b has the same structure as the first moving blade 22a and has the same performance.

[0037] In one embodiment, Figures 5 to 7As shown, the axial spacing between the first moving wheel shell 21a and the first stationary wheel shell 31a is 0.5-3.5mm, the axial spacing between the second stationary wheel shell 31b and the second moving wheel shell 21b is 0.5-3.5mm, the spacing between the first moving wheel shell 21a, the first stationary wheel shell 31a, the second stationary wheel shell 31b, and the second moving wheel shell 21b is small, and the diameter difference is not large, so the wind can flow smoothly and the wind energy loss is small. The axial spacing between the first moving blade 22a and the first stationary blade 32a is 3-6.2mm, the axial spacing between the second stationary blade 32b and the second moving blade 22b is 3-6.2mm, and there is a suitable spacing between the adjacent two of the first moving blade 22a, the first stationary blade 32a, the second stationary blade 32b, and the second moving blade 22b, which can control the wind pressure and avoid backflow caused by excessive wind pressure, and can smoothly send the wind forward. The radial distance between the top of the first moving blade 22a and the housing 1 is 0.5-3.5 mm. A suitable distance can increase the wind pressure and avoid noise caused by air flow friction.

[0038] In one embodiment, Figure 1 , Figure 2 and Figure 5 As shown, the fan unit further includes an air inlet cover 3c arranged at the rear of the housing 1 and an air outlet cover 3d arranged at the front of the housing 1. It should be understood that the air inlet cover 3c and the air outlet cover 3d can also be set as the structure of the static fan, or as shown in the figure, the air inlet cover 3c can be set as a structure with multiple micro holes, and the micro holes can be circular or regular hexagonal. The air inlet cover 3c and the air outlet cover 3d both have the functions of rectifying and guiding.

[0039] 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. An air outlet structure, applied to a portable fan, characterized in that: include: The shell is connected from front to back, with air entering from the rear end and exiting from the front end; A fan unit is housed in the housing and blows wind toward the front end; Wherein, the fan unit comprises: at least two static fans fixed in the housing; At least two rotating shafts are axially arranged, and each of the rotating shafts is correspondingly fixed to the center of one of the static fans; At least two moving fans are located on the same axis, each of the moving fans is fixed on a corresponding rotating shaft, the rotating shaft drives the moving fans to rotate, and at least two of the moving fans blow air forward; Among them, each of at least two of the static fans and at least two dynamic fans includes a wheel shell, and a plurality of blades arranged at intervals around the outer side of the wheel shell, and the maximum diameter of the wheel shell of any static fan differs from the maximum diameter of the wheel shell of any dynamic fan by less than 5 mm.

2. The air outlet structure according to claim 1, characterized in that: The fan unit includes at least two motors, each of which is fixed to one of the rotating shafts and is accommodated in one of the static fans and / or one of the dynamic fans. Each of the dynamic fans is driven by one of the motors, and the ratio of the maximum diameter of the wheel shell of the static fan to the total diameter of the static fan is 0.15 to 0.

8.

3. The air outlet structure according to claim 1, characterized in that: The fan unit includes two static fans and two dynamic fans, the two static fans are arranged between the two dynamic fans, and the two dynamic fans rotate in opposite directions; or the static fans and the dynamic fans are arranged alternately, and the two dynamic fans rotate in the same direction.

4. The air outlet structure according to claim 3, characterized in that: When the two static fans are arranged between the two dynamic fans, the static fan on the rear side is the first static fan, which includes a first static wheel shell and a plurality of first static blades; the static fan on the front side is the second static fan, which includes a second static wheel shell and a plurality of second static blades; the diameters of the first static wheel shell and the second static wheel shell are both axially unchanged; the first static wheel shell and the second static wheel shell are closely arranged; and the first static blade and the second static blade are spaced 0.2 to 1 mm apart.

5. The air outlet structure according to claim 4, characterized in that: When the two static fans are arranged between the two moving fans, the moving fan on the rear side is the first moving fan, and the moving fan on the front side is the second moving fan, the first moving fan includes a first moving wheel shell and a plurality of first moving blades, and the second moving fan includes a second moving wheel shell and a plurality of second moving blades, the first moving wheel shell opens forward, and the second moving wheel shell opens backward.

6. The air outlet structure according to claim 5, characterized in that: The first impeller shell includes an end portion, an enlarged portion, and a smooth portion connected in sequence front and back, and the second impeller shell includes a smooth portion, an enlarged portion, and an end portion connected in sequence front and back, the diameter of the end portion is smaller than the diameter of the smooth portion, and the diameter of the enlarged portion tends to increase from the end portion to the smooth portion.

7. The air outlet structure according to claim 6, characterized in that: A plurality of the first moving blades are connected to the smooth portion and the enlarged portion, or a plurality of the first moving blades are connected to the smooth portion; A plurality of the second moving blades are connected to the smooth portion and the expanded portion, or a plurality of the second moving blades are connected to the smooth portion; the diameter of the end portion is 12.3 to 16.3 mm, the diameter of the smooth portion is 19.24 to 23.24 mm, and the axial lengths of the first moving wheel shell and the second moving wheel shell are both 15 to 19 mm.

8. The air outlet structure according to claim 6, characterized in that: The leading edge and the trailing edge of the first moving blade are both straight lines, the first moving blade is radially twisted and bent from the blade root to the blade top, the blade root of the first moving blade is inclined and extends from the back to the front, the angle between the connecting line of the front and rear ends of the blade root of the first moving blade and the axial direction is 30 to 80°, the angle between the connecting line of the front and rear ends of the blade root of the first moving blade and the connecting line of the front and rear ends of the blade top of the first moving blade is 5 to 25°, a plurality of the second moving blades and a plurality of the first moving blades are axially symmetrically arranged; the blade roots of the first stationary blade and the second stationary blade extend axially straight forward.

9. The air outlet structure according to claim 6, characterized in that: The axial spacing between the first moving wheel shell and the first stationary wheel shell is 0.5 to 3.5 mm, the axial spacing between the second stationary wheel shell and the second moving wheel shell is 0.5 to 3.5 mm, the axial spacing between the first moving blade and the first stationary blade is 3 to 6.2 mm, and the axial spacing between the second stationary blade and the second moving blade is 3 to 6.2 mm; the radial spacing between the top of the first moving blade and the shell is 0.5 to 3.5 mm, and the radial spacing between the top of the second moving blade and the shell is 0.5 to 3.5 mm.

10. A portable fan, characterized in that: It comprises the air outlet structure as described in any one of claims 1 to 9, and the portable fan is any one of a desktop fan, a clip fan, a handheld fan, and a neck hanging fan.

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