Portable fan

Abstract

The present application provides a portable fan, comprising: a housing, which is provided with an air inlet cavity, a fixed cavity and an air duct in sequence along the length direction, and the housing is also provided with an air inlet and an air outlet, the air inlet is connected to the air inlet cavity, the air outlet is connected to the air duct, and the air outlet is arranged along the length direction of the air duct; a brake assembly is accommodated in the fixed cavity, the brake assembly sucks the wind from the air inlet, passes through the air inlet cavity, the brake assembly and the air duct, and then blows it out from the air outlet; wherein the air duct comprises a first air contraction section and a second air contraction section connected in sequence along the length direction, the first air contraction section is arranged adjacent to the fixed cavity, the first air contraction section has a portion with a reduced cross section relative to the fixed cavity, and the second air contraction section has a portion with a reduced cross section relative to the first air contraction section. By arranging the first air contraction section and the second air contraction section with a portion with a reduced cross section, the wind pressure is increased, the farthest air supply distance becomes longer, and the air outlet range is large, so that the air outlet is uniform at all places.

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] In recent years, people are increasingly pursuing a more convenient life. In order to meet the demand for using fans in outdoor activities or other life scenarios, a variety of portable fan products have appeared on the market, such as handheld fans, neck-hanging fans, etc.

[0003] Among the current portable fans, some air outlets are closer to the fan, so the air outlet effect is better; some air outlets are farther away from the fan, so the air outlet effect is poor. The air outlets are uneven, and the cooling effect of the corresponding parts is different, which leads to poor user experience. Therefore, how to make the air outlets more uniform is an urgent problem to be solved. Summary of the invention

[0004] In view of this, the present application provides a portable fan, which increases the wind pressure, lengthens the maximum air supply distance, and expands the air outlet range by providing a first wind reduction section and a second wind reduction section with a portion with a reduced cross-section, so that the air outlet is uniform at all locations.

[0005] The present application provides a portable fan, comprising: a shell, which is provided with an air inlet chamber, a fixed chamber and an air duct in sequence along the length direction, the shell is also provided with an air inlet and an air outlet, the air inlet is connected to the air inlet chamber, the air outlet is connected to the air duct, and the air outlet is arranged along the length direction of the air duct; a brake assembly is accommodated in the fixed chamber, the brake assembly sucks air from the air inlet, passes through the air inlet chamber, the brake assembly and the air duct, and then blows air out from the air outlet; wherein the air duct comprises a first air contraction section and a second air contraction section connected in sequence along the length direction, the first air contraction section is arranged adjacent to the fixed chamber, the first air contraction section has a portion with a reduced cross-section relative to the fixed chamber, and the second air contraction section has a portion with a reduced cross-section relative to the first air contraction section; the brake assembly comprises a motor, the motor is a three-phase high-speed motor, and the speed range of the motor is 15000-41000 revolutions per minute.

[0006] The length of the first wind contraction section is smaller than that of the second wind contraction section, and the length of the second wind contraction section is 2-8 times of the length of the first wind contraction section; the second wind contraction section includes a wind collecting portion, and the wind collecting portion is arranged at one end of the second wind contraction section away from the brake assembly, and the wind collecting portion is used to reduce the cross-section, and the wind collecting portion reduces the cross-section of the second wind contraction section more greatly in the direction away from the brake assembly.

[0007] A first limiting portion is provided between the fixed cavity and the air inlet cavity, and a second limiting portion is provided between the fixed cavity and the air duct, and the first limiting portion and the second limiting portion jointly limit the braking assembly; the inner wall of the first air contraction section extends from the free edge of the second limiting portion toward the second air contraction section, and the cross-sectional area of ​​the first air contraction section gradually decreases along the length direction away from the braking assembly.

[0008] The shell includes a first wall and a second wall, the first side of the first wall is closed and connected to the first side of the second wall, the second side of the first wall is opposite to and spaced from the second side of the second wall, the first side of the first wall and the second side of the first wall extend in the same direction, and the second side of the first wall extends beyond the first side of the first wall, the first side of the second wall and the second side of the second wall extend in the same direction, and the second side of the second wall extends beyond the first side of the second wall.

[0009] The air outlet is arranged in the second air contraction section, and the air outlet covers the entire second air contraction section; the inner surface of the first wall and the inner surface of the second wall define the second air contraction section, the outer surface of the first wall and the inner surface of the second wall define the air outlet, and the depth of the air outlet is 15-23 mm.

[0010] It also includes a plurality of guide members, which are spaced apart along the length direction of the second wind reduction section, and are used to guide the wind generated by the brake assembly to blow toward the air outlet. The guide members abut against the first wall and the second wall at the same time, and are integrally formed from the inner surface of the second wall. A plurality of grooves are formed on the outer surface of the first wall, and the guide members abut against the grooves accordingly.

[0011] It also includes a third wall, which is arranged on the outer side of the second side of the second wall, and is in the shape of a sheet. The third wall is spaced apart from the second side of the second wall to form an air suction port; one side of the third wall extends in the same direction as the second side of the second wall, and one side of the third wall extends beyond the second side of the second wall, and the other side of the third wall extends in the same direction as the second side of the first wall, and the other side of the third wall does not extend beyond the second side of the first wall.

[0012] The air suction port extends in parallel with the air outlet, and the air suction port and the air outlet are arranged side by side along the length direction, and the air from outside the portable fan is sucked through the air suction port by the airflow blown out of the air outlet.

[0013] It also includes a driving plate, the braking assembly includes the motor and the fan, the motor includes a cylinder, a stator assembly and a rotor assembly, and at least a part of the fan is arranged in the cylinder; it also includes a control assembly, the control assembly includes a power supply for providing power to the braking assembly, and a control component for controlling the braking assembly, the power supply is electrically connected to the control component, and the control component is electrically connected to the driving plate; the shell is provided with the air inlet chamber, the fixed chamber, the air duct and the accommodating chamber in sequence along the length direction, the control assembly is accommodated in the accommodating chamber, and the control component includes a switch and an interface exposed outside the shell.

[0014] The length of the air duct is 4-6 times the length of the air inlet cavity, the maximum cross-sectional area of ​​the air duct is smaller than the minimum cross-sectional area of ​​the air inlet cavity, the maximum cross-sectional area of ​​the fixed cavity is less than or equal to the minimum cross-sectional area of ​​the air inlet cavity, and the minimum cross-sectional area of ​​the fixed cavity is greater than or equal to the maximum cross-sectional area of ​​the air duct; the diameter of the part of the shell in the fixed cavity is 28-35 mm, and the length of the shell in the fixed cavity is 30-40 mm.

[0015] Compared with the prior art, the portable fan of the present application has the following beneficial effects: by providing the first wind shrinkage section and the second wind shrinkage section with a reduced cross-section, the wind pressure is increased, the maximum air supply distance is extended, and the air outlet range is large, so that the air outlet is uniform at all places. The motor speed range is 15000-41000 revolutions per minute to reduce the high speed noise of the three-phase high-speed motor, and the wind speed and air volume are controlled to be suitable for the user's portable use of the blowing scene. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a portable fan of the present application;

[0017] Figure 2 is a cross-sectional view of the portable fan of the present application;

[0018] Figure 3 is a partial exploded view of the portable fan of the present application;

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

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

[0021] Figure 6 yes Figure 5 A magnified view of part D in the middle;

[0022] Figure 7 yes Figure 5 Schematic diagram from another angle;

[0023] Figure 8 yes Figure 2 Enlarged view of part C;

[0024] Fig. 9 It is a cross-sectional view of the brake assembly of the present application. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] In one embodiment, Figures 1 to 3 , which is a schematic diagram of a portable fan of the present application. The portable fan comprises a housing 1 and a brake assembly. The housing 1 is provided with an air inlet cavity 13, a fixed cavity 14 and an air duct 15 in sequence along the length direction. The housing 1 is also provided with an air inlet 11 and an air outlet 12. The air inlet 11 is connected to the air inlet cavity 13, and the air outlet 12 is connected to the air duct 15. The brake assembly is accommodated in the fixed cavity 14. The brake assembly sucks air from the air inlet 11, passes through the air inlet cavity 13, the brake assembly and the air duct 15, and then blows air out from the air outlet 12.

[0030] Among them, Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the air outlet 12 is arranged along the length direction of the air duct 15, and the air duct 15 includes a first air contraction section 152 and a second air contraction section 153 connected in sequence along the length direction. The first air contraction section 152 is arranged adjacent to the fixed cavity 14, and the first air contraction section 152 has a portion with a reduced cross-section relative to the fixed cavity 14, and the second air contraction section 153 has a portion with a reduced cross-section relative to the first air contraction section 152. By providing the first air contraction section 152 and the second air contraction section 153 with a portion with a reduced cross-section, the wind pressure is increased, the farthest air supply distance becomes longer, and the air outlet range is large, so that the air outlet 12 is uniform at all locations. And by using the first air contraction section 152 and the second air contraction section 153 with reduced cross-sectional areas along the length direction, the wind flow is smoothly flowed to the air outlet 12, reducing noise.

[0031] The length of the first wind shrinking section 152 is less than that of the second wind shrinking section 153, and the length of the second wind shrinking section 153 is 2-8 times the length of the first wind shrinking section 152. The first wind shrinking section 152 is the main wind shrinking area, close to the fixed cavity 14, and pressurizes and concentrates the wind generated by the brake assembly. However, the length of the first wind shrinking section 152 should not be too long, otherwise it will cause excessive wind pressure and fail to blow out, and generate too strong noise.

[0032] In one embodiment, Figure 3 and Figure 4 As shown, the second air contraction section 153 includes an air gathering portion 154, which is arranged at one end of the second air contraction section 153 away from the brake assembly, and the air gathering portion 154 is used to reduce the cross section. And in the direction away from the brake assembly, the degree of reduction of the cross section of the second air contraction section 153 by the air gathering portion 154 is stronger. At the end of the second air contraction section 153 away from the brake assembly, the air volume of the part close to the brake assembly is reduced due to the distance from the brake assembly, which is easy to affect the air volume and air outlet distance. By setting the air gathering portion 154, the wind is pressurized to make the air outlet uniform.

[0033] It should be understood that the second air contraction section 153 is provided with the air collecting portion 154, which reflects the characteristic that the second air contraction section 153 has a smaller cross-section than the first air contraction section 152. In addition, in other embodiments, other air collecting structures can be provided at other positions of the second air contraction section 153, so as to further ensure uniform air flow at various locations of the air outlet 12.

[0034] The housing 1 has an inner surface 1A and an outer surface 1B, and the air outlet 12 is defined by the inner surface 1A and the outer surface 1B, and the inner surface 1A and the outer surface 1B are close to or overlap each other at the air outlet 12. The brake assembly is accommodated in the fixing cavity 14, so the portable fan is safer. The air outlet 12 is defined by the inner surface 1A and the outer surface 1B of the housing 1, and the wind blown out is relatively large and smooth and uniform, and the user has a good blowing experience.

[0035] In one embodiment, Figures 5 to 7 As shown, the air outlet 12 has an outlet 121. At the outlet 121 of the air outlet 12, the interval between the inner surface 1A and the outer surface 1B is in the range of 1-5 mm, which is conducive to the airflow being ejected from the outlet 121 of the air outlet 12 with greater wind force.

[0036] In one embodiment, Figures 3 to 6 As shown, the housing 1 includes a first wall 1a and a second wall 1b, and the first wall 1a and the second wall 1b are separately molded and then assembled. The first side of the first wall 1a is closed and connected to the first side of the second wall 1b, the second side of the first wall 1a is opposite to and spaced from the second side of the second wall 1b, and the outer surface 1B of the first wall 1a and the inner surface 1A of the second wall 1b define the air outlet 12. In this embodiment, the first side of the first wall 1a and the second side of the first wall 1a extend in the same direction, and the second side of the first wall 1a extends beyond the first side of the first wall 1a; the first side of the second wall 1b and the second side of the second wall 1b extend in the same direction, and the second side of the second wall 1b extends beyond the first side of the second wall 1b. The depth of the air outlet 12 is 15-23 mm. The air outlet 12 with a suitable depth can better rectify the outgoing air, reduce noise, and avoid turbulence.

[0037] In one embodiment, Figure 1 , Figure 2 , Figure 5 and Figure 7 As shown, the air outlet 12 is disposed in the second air contraction section 153, and the air outlet 12 covers the entire second air contraction section 153. The inner surface 1A of the first wall 1a and the inner surface 1A of the second wall 1b define the second air contraction section 153. The air outlet 12 covers the entire second air contraction section 153, so the length of the second air contraction section 153 is relatively long, and the corresponding length of the air outlet 12 is also relatively long, and the air outlet range is large.

[0038] In one embodiment, Figure 3 , Figure 5 , Figure 6 and Figure 7As shown, the portable fan further includes a plurality of guide members 151, and the plurality of guide members 151 are arranged at intervals along the length direction of the air duct 15, and the guide members 151 are used to guide the wind generated by the brake assembly to blow toward the air outlet 12, and the guide members 151 abut against the first wall 1a and the second wall 1b at the same time. By providing the guide members 151, the airflow is rectified and guided, noise is reduced, and turbulence is avoided. It should be understood that there may be a gap between the outer surface 1B of the first wall 1a and the inner surface 1A of the second wall 1b, thereby defining the air outlet 12; or there may be no gap between the outer surface 1B of the first wall 1a and at least part of the inner surface 1A of the second wall 1b, that is, there is an overlapping relationship, and the overlapping part is stretched open by the guide members 151, thereby defining and forming the air outlet 12. In this embodiment, the guide member 151 is integrally formed from the inner surface 1A of the second wall 1b, and a plurality of grooves (not numbered, the same below) are formed on the outer surface 1B of the first wall 1a, and the guide member 151 abuts against the grooves accordingly.

[0039] In one embodiment, Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, a suction port 1d is also provided on one side of the air outlet 12, and the air from outside the portable fan is sucked through the suction port 1d by the airflow blown out of the air outlet 12. The housing 1 also includes a third wall 1c, and the third wall 1c is provided on the outside of the second side of the second wall 1b. The third wall 1c is sheet-shaped, and the third wall 1c is spaced apart from the second side of the second wall 1b to form the suction port 1d. The suction port 1d is provided on one side of the air outlet 12, and the external natural airflow can be attracted through the suction port 1d on the basis of the wind generated by the brake assembly, and together with the wind from the air outlet 12, a larger but equally smooth and uniform airflow is formed, and the user has a better blowing experience. The suction port 1d extends parallel to the air outlet 12, and the suction port 1d and the air outlet 12 are arranged side by side along the length direction, so that the air outlet effect is better.

[0040] In one embodiment, Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, the interval between the third wall 1c and the second side of the second wall 1b is 2.7-3.1 mm, and the interval between the third wall 1c and the second side of the first wall 1a is 6.6-12.6 mm. The width of the air suction port 1d is also small, and the wind through the air suction port 1d can be ejected with greater wind force. The outer surface 1B of the second side of the first wall 1a is formed with a Coanda surface, and the air outlet 12 is arranged to guide the airflow onto the Coanda surface.

[0041] In one embodiment, Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, one side of the third wall 1c extends in the same direction as the second side of the second wall 1b, and one side of the third wall 1c extends beyond the second side of the second wall 1b; the other side of the third wall 1c extends in the same direction as the second side of the first wall 1a, and the other side of the third wall 1c does not extend beyond the second side of the first wall 1a. The depth of the air suction port 1d is small, which is conducive to the airflow of the air outlet 12 to draw the external airflow through the air suction port 1d. And one side of the third wall 1c extends beyond the second side of the second wall 1b, and the third wall 1c can better guide the airflow, and the airflow of the air outlet 12 and the air suction port 1d can be smoother and more uniform.

[0042] In one embodiment, Figures 1 to 3 As shown, the length of the air inlet cavity 13 is 20-30 mm, the length of the air duct 15 is 2-6 times the length of the air inlet cavity 13, the maximum cross-sectional area of ​​the air duct 15 is less than the minimum cross-sectional area of ​​the air inlet cavity 13, the maximum cross-sectional area of ​​the fixed cavity 14 is less than or equal to the minimum cross-sectional area of ​​the air inlet cavity 13, and the minimum cross-sectional area of ​​the fixed cavity 14 is greater than or equal to the maximum cross-sectional area of ​​the air duct 15. The cross-sections of the air inlet cavity 13, the fixed cavity 14 and the air duct 15 are in a decreasing relationship along the length direction, and the transition between two adjacent ones of the air inlet cavity 13, the fixed cavity 14 and the air duct 15 is smooth. The length of the air inlet cavity 13 is short, but the cross-sectional area of ​​the air inlet cavity 13 is large, which is conducive to air suction and diversion, and increases the air intake; and the air inlet cavity 13 is provided to effectively avoid turbulence and noise caused by direct contact between the external airflow and the brake assembly. The cross-section of the air duct 15 is relatively small, and the wind generated by the brake assembly is pressurized and concentrated in the air duct 15, thereby enhancing the wind outlet effect; the length of the air duct 15 is long, which can increase the wind outlet range and improve the blowing experience.

[0043] In one embodiment, Figures 1 to 3 As shown, the portion of the housing 1 in the fixed cavity 14 is cylindrical, the diameter of the portion of the housing 1 in the fixed cavity 14 is 28-35 mm, and the length of the housing 1 in the fixed cavity 14 is 30-40 mm. The diameter of the fixed cavity 14 is small, the cross-section of the entire housing 1 can be set to be small, and the neck hanging fan is relatively slender and symmetrical, which is easy to carry. The length of the fixed cavity 14 is also small, and the length of the corresponding air duct 15 for air outlet can be set more reasonably.

[0044] In one embodiment, Figure 2 , Figure 3 , Figure 8 and Fig. 9 As shown, the brake assembly includes a motor 2 and a fan 3. The motor 2 includes a cylinder 21, a stator assembly 22 and a rotor assembly 23. The motor 2 is a three-phase high-speed motor 2. The three-phase high-speed motor 2 can provide a high-speed and stable rotation speed to improve the air outlet effect. At least part of the fan 3 is arranged in the cylinder 21. In this embodiment, the entire fan 3 is arranged in the cylinder 21. Therefore, the brake assembly has a compact and reasonable structure, and the length of the cavity occupied is relatively short. The speed range of the motor 2 is 15000-41000 revolutions per minute, so as to reduce the high-speed noise of the three-phase high-speed motor, and control the wind speed and air volume, which is suitable for the user's portable use of the hair blowing scene.

[0045] In one embodiment, Figure 2 , Figure 3 , Figure 8 and Fig. 9 As shown, the brake assembly further includes a buffer sleeve 33 disposed outside the cylinder 21, and the buffer sleeve 33 includes an annular portion 331 and a plurality of convex portions 332 spaced around the outer surface 1B of the annular portion 331. When the brake assembly is accommodated in the fixing cavity 14, at least part of the plurality of convex portions 332 is compressed, so that the brake assembly can be firmly fixed in the fixing cavity 14, and the buffer sleeve 33 provides the brake assembly with strong friction and buffering shock absorption capabilities, effectively reducing the noise generated by the brake assembly.

[0046] In one embodiment, Figure 2 , Figure 3 , Figure 8 and Fig. 9As shown, a first limiting portion 17 is provided between the fixed cavity 14 and the air inlet cavity 13, and a second limiting portion 18 is provided between the fixed cavity 14 and the air duct 15, and the first limiting portion 17 and the second limiting portion 18 jointly limit the brake assembly. The buffer sleeve 33 also includes a rimming portion 333 connecting the two ends of the buffer sleeve 33, the rimming portion 333 at one end isolates and buffers the end of the cylinder 21 and the first limiting portion 17, and the rimming portion 333 at the other end isolates and buffers the end of the cylinder 21 and the second limiting portion 18. The rimming portion 333 further provides the brake assembly with a buffering and shock-absorbing capability, and further reduces the noise generated by the brake assembly. In addition, the cooperation of the first limiting portion 17, the second limiting portion 18 and the rimming portions 333 at both ends also further limits the axial movement of the brake assembly, so that the brake assembly is firmly fixed to the fixed cavity 14, and the brake assembly can stably, continuously and low-noise generate wind. The material of the buffer sleeve 33 can be silica gel, foam, or other materials with buffering ability, which is not limited to the examples. Of course, in other embodiments, the brake assembly may not be provided with the buffer sleeve 33.

[0047] In one embodiment, Figures 2 to 6 As shown, the inner wall of the first wind shrinking section 152 extends from the free edge of the second limiter 18 toward the second wind shrinking section 153, and the cross-sectional area of ​​the first wind shrinking section 152 gradually decreases along the length direction away from the brake assembly. The starting point of the first wind shrinking section 152 starts from the second limiter 18, and the smooth transition is conducive to reducing the vortex formed by the reduction of the cross-sectional area, so that the airflow flows smoothly to the second wind shrinking section 153 and reduces noise. Of course, in other embodiments, the inner wall of the first wind shrinking section 152 may not extend from the free edge of the second limiter 18 toward the second wind shrinking section 153, as long as the inner wall of the first wind shrinking section 152 can be smoothly transitioned, the airflow flows smoothly and the noise is reduced.

[0048] In one embodiment, Figure 2 , Figure 3 , Figure 8 and Fig. 9As shown, the cylinder 21 includes an outer ring portion 211, an inner ring portion 212, and a plurality of connecting blades 213 connecting the outer ring portion 211 and the inner ring portion 212. The inner ring portion 212 is arranged on the side of the outer ring portion 211 close to the air duct 15, and the inner ring portion 212 is slightly protruded toward the direction of the air duct 15, so that the side of the outer ring portion 211 facing the air inlet chamber 13 has a larger space to arrange other structures, and the space layout in the cylinder 21 is reasonable. A base plate 214 is arranged in the inner ring portion 212, and a hollow shaft cylinder 215 extends axially from the base plate 214 toward the air inlet chamber 13. The rotor assembly 23 includes a rotating shaft 231, a bearing 232 and a magnetic ring 233. The rotating shaft 231 and at least one bearing 232 are arranged in the shaft cylinder 215. In this embodiment, the number of the bearings 232 is 2, and the two bearings 232 are arranged in the shaft cylinder 215. Of course, one of the two bearings 232 may be disposed inside the shaft cylinder 215, and the other may be disposed outside the shaft cylinder 215, as long as a stable fit between the rotating shaft 231 and the shaft cylinder 215 can be ensured. The stator assembly 22 is disposed radially outside the rotating shaft 231 and the shaft cylinder 215, and the magnetic ring 233 is disposed radially outside the stator assembly 22; the fan 3 is disposed on a side of the outer ring portion 211 close to the air inlet chamber 13, and the fan 3 is fixed on the rotating shaft 231.

[0049] In one embodiment, as shown in FIG. Figure 2 , Figure 3 , Figure 8 and Fig. 9 As shown, the rotor assembly 23 also includes a housing 234, which is sleeved on the outside of the magnetic ring 233, and the housing 234 is tightly matched with the rotating shaft 231. The fan 3 is fixed on the rotating shaft 231, and the fan 3 and the motor 2 are coaxially arranged, and the fan 3 and the housing 234 are coaxially arranged. The stator assembly 22 generates a magnetic field, so that the magnetic ring 233 and the housing 234 rotate, and the housing 234 drives the rotating shaft 231 and the fan 3 to rotate at the same time. There is no need to set up a transmission device on the motor 2 and the fan 3, which effectively improves the transmission efficiency of the neck hanging fan.

[0050] In one embodiment, Figure 2 , Figure 3 , Figure 8 and Fig. 9As shown, the fan 3 includes a hub 31 and a plurality of blades 32 arranged at intervals around the outside of the hub 31. The diameter of the maximum cross section of the hub 31, the diameter of the housing 234, and the diameter of the inner ring portion 212 differ by less than 2 mm. The wind generated by the plurality of blades 32 can smoothly pass through the area between the housing 234 and the outer ring portion 211, and the area between the inner ring portion 212 and the outer ring portion 211, and blow toward the air duct 15. The hub 31, the housing 234, and the inner ring portion 212 are axially arranged, and the diameters of the three are similar, so that the motor 2 and the fan 3 have compact structures.

[0051] In one embodiment, Figure 2 , Figure 3 , Figure 8 and Fig. 9 As shown, the inner ring portion 212 is formed with a receiving portion 216 on the side of the substrate 214 facing the air duct 15, the drive plate 24 is arranged in the receiving portion 216, and the control member 42 is electrically connected to the drive plate 24. The receiving portion 216 is directly formed by the inner ring portion 212, that is, the drive plate 24 is directly clamped in the inner ring portion 212 and arranged toward the air duct 15, which is conducive to the connection of the drive plate 24 with other electrical components. The substrate 214 is also provided with a notch, and the wire electrically connects the stator assembly 22 and the drive plate 24 via the notch.

[0052] In one embodiment, Figure 2 , Figure 3 , Figure 8 and Fig. 9 As shown, both of the two free ends of the housing 1 are provided with a receiving cavity 16. The neck hanging fan further includes a control assembly, the control assembly includes a power supply 41 for providing power to the brake assembly, and a control component 42 for controlling the brake assembly, the power supply 41 is electrically connected to the control component 42, and the control component 42 is electrically connected to the drive board 24. The power supply 41 and the control component 42 are accommodated in the receiving cavity 16, and the control component 42 includes a switch 43 and an interface 44 exposed outside the free end of the housing 1.

[0053] It should be understood that in this embodiment, the air inlet chamber 13, the fixed chamber 14, the air duct 15 and the accommodating chamber 16 are sequentially provided along the length direction of the housing 1. Of course, in other embodiments, the air inlet chamber 13, the fixed chamber 14 and the air duct 15 may be sequentially provided along the length direction of the housing 1, and the accommodating chamber 16 may be provided on one side of the air inlet chamber 13 or on one side of the air duct 15.

[0054] In one embodiment, Figures 1 to 5 As shown, the portable fan is a neck-hanging fan, and the shell 1 is symmetrically provided with two air inlet chambers 13, two fixed chambers 14 and two air ducts 15, and the two brake assemblies are respectively arranged in the two fixed chambers 14. The air outlet 12 is worn upward, and the wind generated by the brake assembly blows toward the user's head, and the air suction port 1d can accelerate the air flow near the neck and has a sweat-absorbing effect. Alternatively, the air outlet 12 is worn downward, and the wind in the brake assembly blows toward the user's neck, and the air suction port 1d can accelerate the air flow near the head and has a sweat-absorbing effect. In other embodiments, the portable fan can also be a handheld fan, a clip fan, a versatile fan or other portable fans, not limited to the examples.

[0055] 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: A shell, wherein an air inlet cavity, a fixed cavity and an air duct are sequentially provided along the length direction, and the shell is further provided with an air inlet and an air outlet, wherein the air inlet is connected to the air inlet cavity, the air outlet is connected to the air duct, and the air outlet is arranged along the length direction of the air duct; A brake assembly is housed in the fixed cavity, and the brake assembly sucks air from the air inlet, passes through the air inlet cavity, the brake assembly and the air duct, and then blows air out from the air outlet; The air duct comprises a first air contraction section and a second air contraction section connected in sequence along the length direction, the first air contraction section is arranged adjacent to the fixed cavity, the first air contraction section has a portion with a reduced cross-section relative to the fixed cavity, and the second air contraction section has a portion with a reduced cross-section relative to the first air contraction section; The brake assembly includes a motor, which is a three-phase high-speed motor; The housing comprises a first wall and a second wall, wherein the first side of the first wall is closedly connected to the first side of the second wall, the second side of the first wall is opposite to and spaced from the second side of the second wall, the first side of the first wall and the second side of the first wall extend in the same direction, and the second side of the first wall extends beyond the first side of the first wall, and the first side of the second wall and the second side of the second wall extend in the same direction, and the second side of the second wall extends beyond the first side of the second wall; The air outlet is arranged in the second air contraction section, the inner surface of the first wall and the inner surface of the second wall define the second air contraction section, and the outer surface of the first wall and the inner surface of the second wall define the air outlet; It also includes a third wall, which is arranged on the outer side of the second side of the second wall, the third wall is sheet-shaped, and is spaced apart from the second side of the second wall to form an air suction port.

2. The portable fan according to claim 1, characterized in that: The length of the first wind contraction section is smaller than that of the second wind contraction section, and the length of the second wind contraction section is 2-8 times of the length of the first wind contraction section; the second wind contraction section includes a wind collecting portion, and the wind collecting portion is arranged at one end of the second wind contraction section away from the brake assembly, and the wind collecting portion is used to reduce the cross-section, and the wind collecting portion reduces the cross-section of the second wind contraction section more greatly in the direction away from the brake assembly.

3. The portable fan according to claim 2, characterized in that: A first limiting portion is provided between the fixed cavity and the air inlet cavity, and a second limiting portion is provided between the fixed cavity and the air duct, and the first limiting portion and the second limiting portion jointly limit the braking assembly; the inner wall of the first air contraction section extends from the free edge of the second limiting portion toward the second air contraction section, and the cross-sectional area of ​​the first air contraction section gradually decreases along the length direction away from the braking assembly.

4. The portable fan according to claim 1, characterized in that: The speed range of the motor is 15000-41000 revolutions per minute.

5. The portable fan according to claim 1, characterized in that: The air outlet extends over the entire second air contraction section, and the depth of the air outlet is 15-23 mm.

6. The portable fan according to claim 1, characterized in that: It also includes a plurality of guide members, which are spaced apart along the length direction of the second wind reduction section, and are used to guide the wind generated by the brake assembly to blow toward the air outlet. The guide members abut against the first wall and the second wall at the same time, and are integrally formed from the inner surface of the second wall. A plurality of grooves are formed on the outer surface of the first wall, and the guide members abut against the grooves accordingly.

7. The portable fan according to claim 1, characterized in that: One side of the third wall extends in the same direction as the second side of the second wall, and one side of the third wall extends beyond the second side of the second wall, and the other side of the third wall extends in the same direction as the second side of the first wall, and the other side of the third wall does not extend beyond the second side of the first wall.

8. The portable fan according to claim 7, characterized in that: The air suction port extends in parallel with the air outlet, and the air suction port and the air outlet are arranged side by side along the length direction, and the air from outside the portable fan is sucked through the air suction port by the airflow blown out of the air outlet.

9. The portable fan according to claim 1, characterized in that: It also includes a driving plate, the braking assembly includes the motor and the fan, the motor includes a cylinder, a stator assembly and a rotor assembly, and at least a part of the fan is arranged in the cylinder; it also includes a control assembly, the control assembly includes a power supply for providing power to the braking assembly, and a control component for controlling the braking assembly, the power supply is electrically connected to the control component, and the control component is electrically connected to the driving plate; the shell is provided with the air inlet chamber, the fixed chamber, the air duct and the accommodating chamber in sequence along the length direction, the control assembly is accommodated in the accommodating chamber, and the control component includes a switch and an interface exposed outside the shell.

10. The portable fan according to claim 1, characterized in that: The length of the air duct is 4-6 times the length of the air inlet cavity, the maximum cross-sectional area of ​​the air duct is smaller than the minimum cross-sectional area of ​​the air inlet cavity, the maximum cross-sectional area of ​​the fixed cavity is less than or equal to the minimum cross-sectional area of ​​the air inlet cavity, and the minimum cross-sectional area of ​​the fixed cavity is greater than or equal to the maximum cross-sectional area of ​​the air duct; the diameter of the part of the shell in the fixed cavity is 28-35 mm, and the length of the shell in the fixed cavity is 30-40 mm.

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